Method for neutralizing flue gases of fuel-burning units

FIELD: toxic flue gas combustion technology for fuel-burning units.

SUBSTANCE: flue gases are neutralized in combustion chamber; total fuel flow is bifurcated; first fuel flow is mixed up with flue gases supplied to combustion chamber and second one is conveyed to combustion-chamber burners wherein it is burned in air environment and then passed to combustion chamber. Coke gas, flue gas, or blast-furnace gas, or generator gases, or mixture thereof can be used as fuel; total flowrate of flue gases (B"G) at combustion chamber outlet, total flowrate of fuel (BF) supplied to combustion chamber, flowrate of air (BA) supplied to combustion chamber, and flowrate of fuel (BFBRN) supplied to burners are found from following set of equations (1), (2), (3), (4):

, where B'G is flowrate of flue gases from combustion chamber outlet, kg/h; T'G is temperature of flue gases at combustion chamber inlet, °C; O'2 is oxygen content in flue gases at combustion chamber inlet, %; C'G is heat capacity of flue gases at combustion chamber inlet, kcal/kg; B"G is total flowrate of flue gases at combustion chamber outlet, kg/h; BF is total flowrate of fuel supplied to combustion chamber, kg/h; BFBRN is fuel flowrate to burners, kg/h; QFL is fuel low heating value as fired, kcal/kg; O2" is oxygen content in flue gases at combustion chamber outlet, %; VAO is theoretical air flowrate for burning 1 kg of fuel, kg/h; BA is air flowrate to combustion chamber, kg/h; TG" is gas temperature at combustion chamber outlet, °C; CG" is heat capacity of flue gases at combustion chamber outlet, kcal/kg; α is excess air coefficient. Temperature within combustion chamber is maintained between 850 and 1150 °C.

EFFECT: enhanced efficiency of flue gas neutralization in fuel-burning units.

1 cl, 1 dwg, 3 tbl, 1 ex

 

The invention relates to methods of reducing the toxicity of smoke gases of fuel assemblies containing oxygen, in particular coke oven batteries, and can be used in metallurgical and other industries.

There is a method of disposal of flue gases of fuel assemblies containing oxygen, characterized in that the neutralization of the flue gas leading to the combustion chamber, the fuel flow is directed into the combustion chamber where they burn in air flowing into the combustion chamber (see ed. mon. The USSR №949295, MCL F 23 G 7/06, publ. 07.08.82 year).

The disadvantages of this method are the lack of effect of decreasing nitrogen oxides (hereinafter - NOx), as well as increased fuel consumption on the disposal of flue gases due to the increase of the coefficient of excess air in the combustion chamber when the supply of an additional quantity of air in delaborated flue gases.

There is a method of disposal of flue gases for fuel combustion units, characterized in that the neutralization of the flue gas leading to the combustion chamber, the total fuel flow is divided into two streams, the first stream of fuel is mixed with the combustion gases supplied to the combustion chamber, the second flow of fuel is directed into the burner combustion chamber where they burn in air, and then fed to the combustion chamber (smast. mon. The USSR №1564471, MCL F 23 G 7/06, publ. 15.05.90 year).

The disadvantage of this method is the formation of a significant number of NOxin delaborated gases in the passage of flue gases through the high temperature zone of the combustion chamber, which is connected with the impossibility to control the temperature level in the combustion chamber, and a lack of temperature and process control mode of the combustion chamber.

The present invention is to develop an efficient method of disposal of flue gases for fuel combustion units that reduce the concentration of nitrogen oxides in flue gases by selecting the type of fuel, optimizing the supply of fuel and air into the combustion chamber, as well as regulate the temperature at the outlet of the combustion chamber.

The problem is solved in that in the known method of disposal of flue gases for fuel combustion units, which is characterized by the fact that the disposal of flue gas are in the combustion chamber, the total fuel flow is divided into two streams, the first stream of fuel is mixed with the combustion gases supplied to the combustion chamber, and a second flow of fuel is directed into the burner combustion chamber where they burn in air, and then fed into the combustion chamber, according to the invention as fuel use is coke oven gas, or blast furnace gas, or power gas, or a mixture of these gases, the total flow rate of flue gases (InG") at the outlet of the combustion chamber, the total fuel consumption (InT)supplied into the combustion chamber, the air flow (InIn)supplied into the combustion chamber, and fuel consumption (InTMOUNTAINS)supplied to the burner, determined in accordance with the following system of equations(1), (2), (3), (4):

whereG' the flow of flue gases at the combustion chamber inlet, kg/h;

TG' the temperature of the flue gases at the inlet of the combustion chamber, °C;

About2' the oxygen content in the flue gases at the inlet of the combustion chamber, %;

CG' is the heat capacity of the flue gases at the inlet of the chamber of combustion, kcal/kg;

InG" the flow of flue gases at the outlet of the combustion chamber, kg/h;

InT- total fuel supplied to the combustion chamber, kg/h;

InTMOUNTAINS- the fuel for the burner kg/h;

QPN- lower heating value of fuel, kcal/kg;

About2" the oxygen content in the flue gas at the exit of the combustion chamber, %;

VBOtheoretical air flow to the combustion of 1 kg of fuel, kg/h;

In In- air flow to the combustion chamber, kg/h;

TG" is the temperature of the gases at the outlet of the combustion chamber, °C;

WithG" is the heat capacity of the flue gas at the exit of the chamber of combustion, kcal/kg;

α - coefficient of excess air,

and the temperature in the combustion chamber supported at the level of 850-1150°C.

This set of features allows you to reduce the content of NOxdue to the optimal choice of consumption and the fuel composition, and to determine the necessary flow of air that maintains the required temperature level in the combustion chamber.

The claimed method is implemented by installing thermal treatment of flue gases for fuel combustion units, the scheme of which is shown in the drawing.

Flue gases from fuel combustion units, such as coke oven battery 1, are added into the mixer 2. The total fuel flow is served by the pipeline 3, the first flow of fuel through the pipeline 4 is sent to the mixer 2, where it is mixed with the combustion gases, and a second flow of fuel directed through the pipeline 5 on the 6 burner where it is burned in an atmosphere of air supplied through the duct 7, and then fed into the combustion chamber 8. In this case, the duct 7 serves all the necessary air with regard to oxygen contained in the flue gases. In the combustion chamber 8 is burning the e gas and combustible components of flue gases. Simultaneously there is a reduction of NOxdue to its thermal decomposition in the presence of CO, H2CH4at temperatures of 850-1150°C. the combustion Process is carried out so that the temperature at the outlet of the combustion chamber is maintained at 850-1150°C. In this temperature range optimum neutralization of flue gases.

When the temperature drops below 850°With increasing CO content; with the increase of more than 1150° - increases the amount of NOx.

The oxygen content in the flue gas at the exit of the combustion chamber is maintained as low as possible, such as 1-8%. This provides economically feasible heat recovery.

Below are the results of testing the proposed method on installing thermal treatment of flue gases, mounted on the coke oven battery №1 JSC Zaporizhkoks.

An example implementation of the proposed method.

As the fuel used coke oven gas of the following composition,% : CO2- 2,2; O2- 1,1; CmHn- 2,2; CO - 6,3; CH4- 25,3; N2- 58,0; N2- 4,9.

theoretical amount of oxygen required for the combustion of coke oven gas (m3/m3), was determined by the formula:

O2T=0,01·[0,5·(CO+H2)+2·CH4+3,23·CmHn-O2 ,

About2T=0,888 m3/m3gas or O2T=2.86 kg/kg of gas.

theoretical amount required dry air for combustion of coke oven gas (m3/m3) amounted to:

LT=100·O2C/21=4,33 m3/m3gas or LT=2.86 kg/kg of gas.

InG' the flow of flue gases at the inlet of the combustion chamber was 140000 m3/h or 175000 kg/h

TG' the temperature of the flue gases at the inlet of the combustion chamber - 257°C.

TG" the temperature of the flue gases at the outlet of the combustion chamber - 1000°C.

About2' the oxygen content in the flue gases at the inlet of the combustion chamber is 10%.

About2" the oxygen content in the flue gas at the exit of the combustion chamber is 5%.

CG' is the heat capacity of the flue gas supplied to the combustion chamber, was calculated according to their composition:

CO2- 6%; O2- 10%; H2O - 11%; N2- 73%;

WithG'=0,010+0,022+0,042+0,184=0,258 kcal/kg

WithG" is the heat capacity of gases at the outlet of the combustion chamber relied also on their composition: CO2- 8%; O2- 5%; N2O - 10%; N2- 77%;

WithG"=0,021+0,012+0,051+0,205=0,289 kcal/kg;

QPH- lower heating value of fuel 3980 kcal/m3or 9091 kcal/kg;

α - coefficient of air excess

,

where O2- concentration of excess oxygen in the su is their combustion products, %;

CO2- the content of carbon dioxide in dry combustion products.

The ratio isvaries depending on the fuel composition and is for coke oven gas at 0.42 for domain - 2,54, for generating and 2.4.

InG" is the flow rate of gases at the outlet of the combustion chamber defined by the formula (1).

After substitution InTby the formula (2) andBby the formula (3) obtained the equation:

,

where;

.

orG"=168592,54 nm3/hour.

Transforming the formula (2), received a total flow rate of fuel supplied into the combustion chamber, InTkg/hour.

orT=12086,6 nm3/hour.

From the formula (3) determined the flow rate of air supplied into the combustion chamber, InB:

orIn=33590,2/1,29=26039 km3/hour.

Calculating the fuel to the burners InTMOUNTAINSby the formula (4), got:

orTMOUNTAINS=2708,9/0,44=6156,6 km3/hour.

Thus identified the core values of the calculated values when implementing the proposed method of disposal of flue gases.

When these parameters mouth is shutdown thermal treatment of flue gases obtained the following results (to reduce the concentration of CO and NO xin flue gases):

the CO content at the entrance to the installation - 4170 mg/m3;

the CO at the outlet of the installation - 0 mg/m3;

the content of NOxat the entrance to the installation 740 mg/m3;

the content of NOxat the exit of the installation - 467 mg/m3.

Below are the results of tests at different temperature in the combustion chamber when using coke oven gas.

Table 1
The temperature at the outlet of the combustion chamber, °The CO mg/m3The content of NOx(mg/m3
at the entrance to the combustion chamberat the exit of the combustion chamberat the entrance to the combustion chamberat the exit of the combustion chamber
119041500740750
850-11504150-41700-80730-750360-490
8004150750740355

From the data presented in Table 1, it follows that the proposed temperature range of 850-1150°there is almost complete neutralization of the flue gas from the CO and the reduction of NOx40-50%. When when igenii temperature below 850° With the sharp increase in CO content. The content of NOxremains almost at the same level. The temperature rise of more than 1150°leads to a dramatic increase in the content of NOxin flue gases due to the intensive formation of nitrogen oxides during the combustion of coke oven gas in the combustion chamber.

Similar results were obtained in laboratory conditions when used as fuel blast furnace gas, a mixture of blast furnace gas from coke oven gas, and producer gas. The test results are shown in Tables 2, 3.

Table 2 shows the results of tests at different temperatures in the combustion chamber when using blast furnace gas.

Table 3 shows the results of tests at different temperatures in the combustion chamber when using a gas generator.

Table 2
The temperature at the outlet of the combustion chamber, °The CO mg/m3The content of NOx(mg/m3
at the entrance to the combustion chamberat the exit of the combustion chamberat the entrance to the combustion chamberat the exit of the combustion chamber
1160540080-160 520540
850-11505300-55000-120510-530290-310
8405400820520500
Table 3
The temperature at the outlet of the combustion chamber, °The CO mg/m3The content of NOx(mg/m3
at the entrance to the combustion chamberat the exit of the combustion chamberat the entrance to the combustion chamberat the exit of the combustion chamber
1160620040-150640720
850-11506150-62500-110630-650330-350
8406200760640610

The method of disposal of flue gases for fuel combustion units, characterized in that the neutralization of the flue gas leading to the combustion chamber, the total fuel flow is divided into two streams, the first stream of fuel is mixed with the combustion gases supplied to the combustion chamber, and a second flow of fuel is directed into the burner combustion chamber where they burn in air, and then fed into the combustion chamber, the ex is different, however, in use as a fuel coke oven gas or blast furnace gas, or power gas, or a mixture of these gases, the total flow rate of flue gases (InG") at the outlet of the combustion chamber, the total fuel consumption (InT)supplied into the combustion chamber, the air flow (InIn)supplied into the combustion chamber, and fuel consumption (InTMOUNTAINS)supplied to the burner, determined in accordance with the following system of equations(1), (2), (3), (4):

whereG' the flow of flue gases at the combustion chamber inlet, kg/h;

TG' the temperature of the flue gases at the inlet of the combustion chamber, °C;

O2' the oxygen content in the flue gases at the inlet of the combustion chamber, %;

WithG' is the heat capacity of the flue gases at the inlet of the chamber of combustion, kcal/kg;

InG" the flow of flue gases at the outlet of the combustion chamber, kg/h;

InT- total fuel supplied to the combustion chamber, kg/h;

InTMOUNTAINS- the fuel for the burner kg/h;

QPN- lower heating value of fuel, kcal/kg;

O2" the oxygen content in flue gases navyhode combustion chamber, %;

VBOtheoretical air flow to the combustion of 1 kg of fuel, kg/h;

InIn- air flow to the combustion chamber, kg/h;

TG" is the temperature of the gases at the outlet of the combustion chamber, °C;

WithG" is the heat capacity of the flue gas at the exit of the chamber of combustion, kcal/kg;

α - coefficient of excess air,

and the temperature in the combustion chamber supported at the level of 850-1150°C.



 

Same patents:

FIELD: power engineering.

SUBSTANCE: valve comprises rotatable housing provided with passage, outer unmovable ring seal of the housing, ring seal between the rotatable housing and outer unmovable ring seal of the housing that has bore made for permitting gas to flow to the passage or from the passage. The ring seal is movable with respect to the outer ring seal of the housing. The passage and the bore are made for permitting receiving the compressed gas to provide continuous sealing between the outer ring seal of the housing and ring seal when the housing rotates. The valve is additionally provided with means for permitting gas to flow through the radial passage and between the ring seal and outer unmovable ring seal of the housing and setting ring connected with the rotatable housing and locking ring that is mounted at a distance from the setting ring and connected with the rotatable housing. The ring seal is interposed between the setting ring and locking ring.

EFFECT: simplified structure and enhanced efficiency.

16 cl, 30 dwg

Head of torch plant // 2285863

FIELD: arrangements or devices for treating smoke or fumes.

SUBSTANCE: head comprises gas supply pipe with gas gate and protecting shield mounted outside and coaxially at the top end of the gas supply pipe. The protecting shield is composed of two baffles made of two hollow trancated cones mounted one on the other. The grater base of the top baffle faces downward, and that of the bottom baffle faces upward. The smaller base is connected with the gas supply pipe.

EFFECT: enhanced reliability and prolonged service life.

2 cl, 2 dwg

FIELD: burning combustible gas at pressure above atmospheric.

SUBSTANCE: proposed plant is used for burning lean gases; it consists of unit for burning gas at pressure above atmospheric including lean gas chamber, combustion chamber, heat regeneration section and exhaust; pipe line supplying lean gas to lean gas chamber; heat removal and pressure equalizing chamber and preheated air chamber; plant is also provided with pipe line supplying the compressed surrounding air to heat removal and pressure equalizing chamber, preheated air pipe line for delivery of preheated air to preheated air chamber; provision is made for hole for delivery of lean gas from lean gas chamber to combustion chamber and hole for delivery of preheated air from preheated air chamber to combustion chamber. Heat removal and pressure equalizing chamber is made for heat exchange between lean gas chamber, preheated air chamber and combustion chamber and compressed surrounding air; lean gas and preheated air are burnt in combustion pressure at pressure above atmospheric.

EFFECT: enhanced efficiency; minimum difference in pressure between gas and air chambers.

12 cl, 12 dwg

FIELD: the invention refers to industrial ecology and may be used for flameless purification of ejections of industrial enterprises.

SUBSTANCE: the reactor for catalytic purification of gaseous ejections has a cylindrical body, which interior surface is covered with a catalyst with a source of infrared radiation placed in the body, a tube heat exchanger located in the lower part of the body, a turbine mixer located in the upper part of the body and additionally - a permeable cylindrical drum out of the catalyst so that the axles of the symmetry of the drum and body coincide. The drum embraces the mixer and the source of infrared radiation fulfilled in the shape of a six-ends star is installed in the middle of the body so that its flatness is perpendicular to the axle of the symmetry of the reactor. The drawing off socket is connected with the tube space of the heat exchanger, and the feeding socket is located so as to provide heating of gaseous ejections with the heat of the gases moving out of the reactor.

EFFECT: increases effectiveness of purification of gaseous flow and reduces power inputs for heating the gas flow.

1 dwg

FIELD: technologies for combustion of flush gases, including those under high pressure, during extraction and processing of natural gas and oil.

SUBSTANCE: body of burner, mounted on gas inlet pipe, is made conical with widened portion at upper portion, in the body additionally mounted are two catalyst elements, at lower portion on inlet section first catalyst element is positioned, and above on outlet section - second catalyst element, rotary shutters are mounted on base of conical body in additional way, so that in closed position they are in contact with first catalyst element, and open position between first catalyst element and body gap is formed, also, device is additionally provided with one or more main torches, mounted in gas inlet pipeline below rotary shutters and first catalyst element. Relation of diameters of first and second catalyst elements matches relation of debits of hydrocarbon gas, fed in normal mode and during salvo exhaust. Catalyst elements are manufactured either in form of cell-like structured blocks with direction of channels in parallel to direction of feeding of flush gases, or in form of block sections with granulated catalyst, for example, Rachig rings, or in forms of block sections with active-catalyst metallic shavings, or in form of blocks with active-catalyst metallic meshes.

EFFECT: higher ecological safety and fullness of combustion of flush gases in broad flow range, simplified construction and comfort of maintenance.

6 cl, 3 dwg

FIELD: the invention refers to apparatus of regenerative thermal oxidation with multi pass valves.

SUBSTANCE: the apparatus for regenerative thermal oxidation for gas processing has a combustion zone, the first heat exchanging layer keeping heat exchanging surroundings and connecting with the combustion zone; the second heat exchanging layer keeping heat exchanging surroundings and connecting with the combustion zone; a valve for alternate direction of the gas flow between the first and the second heat exchanging layers. At that the valve has the first valve passage and the second valve passage separated from the first valve passage; a flow distributor having an admission passage communicates with the help of fluid medium with the admission opening of the surroundings and an exhaust passage communicates with the help of fluid medium with exhaust opening of fluid surroundings. At that the distributor is fulfilled with possibilities of its the first and the second valve passages between the first position in which the first valve passage communicates with the help of liquid with the admission passage and the second valve passage communicates with the help of liquid surroundings with exhaust passage and the second position in which the indicated the first valve passage communicates with the help of the fluid surrounding with exhaust passage and the second passage of the entry of the valve with the help of liquid surroundings communicates with the admission passage. At that the distributor of flow has a blocking surface which blocks the flow through the first part of the first valve passage and through the second part of the second valve passage when the distributor of the flow is between the first and the second positions and is fulfilled with possibility of its turning to 180o between the first and thesecond positions. At that valve passage is divided as the first so is the second at least into two chambers and the first and the second parts of the valve passages are congruous.

EFFECT: simplifies the construction, provides comfort of controlling and exploitation and deep removal of volatile organic combinations.

22 cl, 12 dwg

FIELD: burning waste gases of pyrolysis furnaces in reworking solid domestic wastes.

SUBSTANCE: proposed combustion chamber includes mixing chamber with active and passive nozzles mounted at its inlet; active and passive nozzles are connected respectively to compressed air source and to waste gas source; mixing chamber is made in form of diffuser at aperture angle of 10-18 deg; ratio of diameters of active and passive nozzles is equal to: Dact:Dpas=0.35-0.4.

EFFECT: enhanced economical efficiency of use of vapor-and-gas cycle.

2 cl, 1 dwg

The invention relates to the oil industry and can be used for burning waste gas in the oil fields and refineries

The invention relates to furnaces for afterburning of flue gases and can be used to solve environmental problems incineration of household and industrial waste

The invention relates to the technology of low neutralization of exhaust gases technical carbon production

FIELD: burning waste gases of pyrolysis furnaces in reworking solid domestic wastes.

SUBSTANCE: proposed combustion chamber includes mixing chamber with active and passive nozzles mounted at its inlet; active and passive nozzles are connected respectively to compressed air source and to waste gas source; mixing chamber is made in form of diffuser at aperture angle of 10-18 deg; ratio of diameters of active and passive nozzles is equal to: Dact:Dpas=0.35-0.4.

EFFECT: enhanced economical efficiency of use of vapor-and-gas cycle.

2 cl, 1 dwg

FIELD: the invention refers to apparatus of regenerative thermal oxidation with multi pass valves.

SUBSTANCE: the apparatus for regenerative thermal oxidation for gas processing has a combustion zone, the first heat exchanging layer keeping heat exchanging surroundings and connecting with the combustion zone; the second heat exchanging layer keeping heat exchanging surroundings and connecting with the combustion zone; a valve for alternate direction of the gas flow between the first and the second heat exchanging layers. At that the valve has the first valve passage and the second valve passage separated from the first valve passage; a flow distributor having an admission passage communicates with the help of fluid medium with the admission opening of the surroundings and an exhaust passage communicates with the help of fluid medium with exhaust opening of fluid surroundings. At that the distributor is fulfilled with possibilities of its the first and the second valve passages between the first position in which the first valve passage communicates with the help of liquid with the admission passage and the second valve passage communicates with the help of liquid surroundings with exhaust passage and the second position in which the indicated the first valve passage communicates with the help of the fluid surrounding with exhaust passage and the second passage of the entry of the valve with the help of liquid surroundings communicates with the admission passage. At that the distributor of flow has a blocking surface which blocks the flow through the first part of the first valve passage and through the second part of the second valve passage when the distributor of the flow is between the first and the second positions and is fulfilled with possibility of its turning to 180o between the first and thesecond positions. At that valve passage is divided as the first so is the second at least into two chambers and the first and the second parts of the valve passages are congruous.

EFFECT: simplifies the construction, provides comfort of controlling and exploitation and deep removal of volatile organic combinations.

22 cl, 12 dwg

FIELD: technologies for combustion of flush gases, including those under high pressure, during extraction and processing of natural gas and oil.

SUBSTANCE: body of burner, mounted on gas inlet pipe, is made conical with widened portion at upper portion, in the body additionally mounted are two catalyst elements, at lower portion on inlet section first catalyst element is positioned, and above on outlet section - second catalyst element, rotary shutters are mounted on base of conical body in additional way, so that in closed position they are in contact with first catalyst element, and open position between first catalyst element and body gap is formed, also, device is additionally provided with one or more main torches, mounted in gas inlet pipeline below rotary shutters and first catalyst element. Relation of diameters of first and second catalyst elements matches relation of debits of hydrocarbon gas, fed in normal mode and during salvo exhaust. Catalyst elements are manufactured either in form of cell-like structured blocks with direction of channels in parallel to direction of feeding of flush gases, or in form of block sections with granulated catalyst, for example, Rachig rings, or in forms of block sections with active-catalyst metallic shavings, or in form of blocks with active-catalyst metallic meshes.

EFFECT: higher ecological safety and fullness of combustion of flush gases in broad flow range, simplified construction and comfort of maintenance.

6 cl, 3 dwg

FIELD: the invention refers to industrial ecology and may be used for flameless purification of ejections of industrial enterprises.

SUBSTANCE: the reactor for catalytic purification of gaseous ejections has a cylindrical body, which interior surface is covered with a catalyst with a source of infrared radiation placed in the body, a tube heat exchanger located in the lower part of the body, a turbine mixer located in the upper part of the body and additionally - a permeable cylindrical drum out of the catalyst so that the axles of the symmetry of the drum and body coincide. The drum embraces the mixer and the source of infrared radiation fulfilled in the shape of a six-ends star is installed in the middle of the body so that its flatness is perpendicular to the axle of the symmetry of the reactor. The drawing off socket is connected with the tube space of the heat exchanger, and the feeding socket is located so as to provide heating of gaseous ejections with the heat of the gases moving out of the reactor.

EFFECT: increases effectiveness of purification of gaseous flow and reduces power inputs for heating the gas flow.

1 dwg

FIELD: burning combustible gas at pressure above atmospheric.

SUBSTANCE: proposed plant is used for burning lean gases; it consists of unit for burning gas at pressure above atmospheric including lean gas chamber, combustion chamber, heat regeneration section and exhaust; pipe line supplying lean gas to lean gas chamber; heat removal and pressure equalizing chamber and preheated air chamber; plant is also provided with pipe line supplying the compressed surrounding air to heat removal and pressure equalizing chamber, preheated air pipe line for delivery of preheated air to preheated air chamber; provision is made for hole for delivery of lean gas from lean gas chamber to combustion chamber and hole for delivery of preheated air from preheated air chamber to combustion chamber. Heat removal and pressure equalizing chamber is made for heat exchange between lean gas chamber, preheated air chamber and combustion chamber and compressed surrounding air; lean gas and preheated air are burnt in combustion pressure at pressure above atmospheric.

EFFECT: enhanced efficiency; minimum difference in pressure between gas and air chambers.

12 cl, 12 dwg

Head of torch plant // 2285863

FIELD: arrangements or devices for treating smoke or fumes.

SUBSTANCE: head comprises gas supply pipe with gas gate and protecting shield mounted outside and coaxially at the top end of the gas supply pipe. The protecting shield is composed of two baffles made of two hollow trancated cones mounted one on the other. The grater base of the top baffle faces downward, and that of the bottom baffle faces upward. The smaller base is connected with the gas supply pipe.

EFFECT: enhanced reliability and prolonged service life.

2 cl, 2 dwg

FIELD: power engineering.

SUBSTANCE: valve comprises rotatable housing provided with passage, outer unmovable ring seal of the housing, ring seal between the rotatable housing and outer unmovable ring seal of the housing that has bore made for permitting gas to flow to the passage or from the passage. The ring seal is movable with respect to the outer ring seal of the housing. The passage and the bore are made for permitting receiving the compressed gas to provide continuous sealing between the outer ring seal of the housing and ring seal when the housing rotates. The valve is additionally provided with means for permitting gas to flow through the radial passage and between the ring seal and outer unmovable ring seal of the housing and setting ring connected with the rotatable housing and locking ring that is mounted at a distance from the setting ring and connected with the rotatable housing. The ring seal is interposed between the setting ring and locking ring.

EFFECT: simplified structure and enhanced efficiency.

16 cl, 30 dwg

FIELD: toxic flue gas combustion technology for fuel-burning units.

SUBSTANCE: flue gases are neutralized in combustion chamber; total fuel flow is bifurcated; first fuel flow is mixed up with flue gases supplied to combustion chamber and second one is conveyed to combustion-chamber burners wherein it is burned in air environment and then passed to combustion chamber. Coke gas, flue gas, or blast-furnace gas, or generator gases, or mixture thereof can be used as fuel; total flowrate of flue gases (B"G) at combustion chamber outlet, total flowrate of fuel (BF) supplied to combustion chamber, flowrate of air (BA) supplied to combustion chamber, and flowrate of fuel (BFBRN) supplied to burners are found from following set of equations (1), (2), (3), (4):

, where B'G is flowrate of flue gases from combustion chamber outlet, kg/h; T'G is temperature of flue gases at combustion chamber inlet, °C; O'2 is oxygen content in flue gases at combustion chamber inlet, %; C'G is heat capacity of flue gases at combustion chamber inlet, kcal/kg; B"G is total flowrate of flue gases at combustion chamber outlet, kg/h; BF is total flowrate of fuel supplied to combustion chamber, kg/h; BFBRN is fuel flowrate to burners, kg/h; QFL is fuel low heating value as fired, kcal/kg; O2" is oxygen content in flue gases at combustion chamber outlet, %; VAO is theoretical air flowrate for burning 1 kg of fuel, kg/h; BA is air flowrate to combustion chamber, kg/h; TG" is gas temperature at combustion chamber outlet, °C; CG" is heat capacity of flue gases at combustion chamber outlet, kcal/kg; α is excess air coefficient. Temperature within combustion chamber is maintained between 850 and 1150 °C.

EFFECT: enhanced efficiency of flue gas neutralization in fuel-burning units.

1 cl, 1 dwg, 3 tbl, 1 ex

FIELD: chemical engineering.

SUBSTANCE: method comprises using gas made of a mixture of carbon dioxide and oxygen in the plasma burner. The plasma burner ionizes gas thus producing carbon monoxide and reactive oxygen that removes ash from the gas. Oxygen and vapor are sprayed and injected to chamber (3) that receives the device with plasma burner. The control system (6) is provided with feedback and controls the concentration of the production gas, nozzle, and plasma burner.

EFFECT: enhanced reliability.

29 cl, 3 dwg

FIELD: the invention is designed for ventilation and may be used at equipping industrial objects.

SUBSTANCE: the system of ventilation of an industrial object has local units of suction air with polluting substances, an airway connecting the local suction units with the suction branch pipe of a boiler's blow fan. The airway is connected through drainage with the pipeline located below it with condensed and liquid fractions of polluting substances. The pipeline is switched to the suction branch pipe of the boiler's blow fan.

EFFECT: increases reliability, economy of the ventilation system of an industrial object.

3 cl, 1 dwg

Up!