Device for post-combustion of waste gases
(57) Abstract:Usage: in the metallurgical, chemical, electric heating industry for neutralization of waste gases emitted, in particular, when the brick-kiln (lining) and other ceramic products. The inventive device for post-combustion of waste gases includes an injector nozzle for the supply of waste gases, mixer, burner Tonel and the secondary combustion chamber. The injector is provided with an axial cylindrical insert with a nozzle and a gas nozzle located inside the insert. Burner Tonel made in the form of the diffuser adjacent to the injector, having a length of 8 to 20 calibers diameter of the mixer and out of the expanding part in the burning chamber. 1 Il. The invention relates to the protection of the environment and can be used in metallurgical, chemical, electric heating industry for neutralization of waste gases emitted, in particular, when the brick-kiln (lining) and other ceramic products.A known method of burning waste gases and a device for its implementation, in which the device for combustion of waste gases contain injector (diffuser) with a pipe for supplying air to the burner tunnel.The reaction mixture is optimal for the full post-combustion of combustible gases must possess thermal energy, providing the temperature of the flame in the combustion is not below 1000-1300aboutWith the excess oxygen from the stoichiometric ratio not lower than 10-12% in the field of post-combustion nonflammable gases.To obtain the parameters of the reaction mixture through an air injector is practically impossible, since the creation of the necessary excess of oxygen, the combustion temperature is obtained underestimated, and at a high temperature torch the excess oxygen content is not enough.The purpose of the invention, the oxidation of combustible gases.The aim is achieved in that the device containing the injector nozzle for the supply of waste gases, mixer, burner tunnel and the secondary combustion chamber, is further provided with pipe supply of oxygen, and the injector is equipped with axiales cylindrical insert with a nozzle and a gas nozzle located inside the insert. Burner tunnel is made in the form of the diffuser adjacent to the injector, having a length of 8 to 20 calibers diameter of the mixer and out of the expanding part in the burning chamber. Supply device pipe supply color the gases are not balanced with nitrogen of the air, consuming heat for heating). The oxygen flow injected through the nozzle in the injector, is divided by a cylindrical insert the nozzle into two parts, one of which is designed for the combustion of additional fuel in the optimum ratio, and the other on the post-combustion gases.If, for example, as additional fuel is natural gas, the flow distribution allows you to burn fuel with the formation of high temperature flame with a temperature above 2000aboutWith located on an axis extending burner tunnel, made in the form of diffuser length 8-20 calibers mixer injector. Energy is another part of the oxygen flowing in the circular gap between the burner tube and the insert, is used for injection box waste gases, resulting in a mixture of oxygen and waste gases with the oxygen content of more than 12% When moving along the walls of the burner tunnel mixture perceives radiation high temperature flame, contact with preheated to a temperature of 1000-1300aboutWith the walls of the burner tunnel. As a result, in the beginning of the burner tunnel begins burning of combustible hydrocarbons, including trudnosgoraemyh.Storeto to a temperature of 1000-1300aboutWith the consumption of additional fuel, and radiation from the axial torch having a temperature above 2000aboutC. On the walls of the burner tunnel is the oxidation of waste gases. The minimum length of the diffuser 8 calibers mixer due to the completion of the process of mixing, known from theory of calculation of the injectors. The maximum length 20 calibers causes the end of the afterburning process, including nonflammable gases, such as benzpyrene, to carbon dioxide and water. To improve post-combustion of the burner wall of the tunnel should consist of materials having catalytic properties, for example of sintered aluminum oxide and chromium.The drawing shows a device for post-combustion of waste gases.The device consists of an injector 1 having air inlets 2, oxygen 3, as well as waste gases with 4 valves 5, 6, 7. The injector 1 has a mixer 8 and is provided with a cylindrical insert 9 with the nozzle 10 and the gas nozzle 11. Between the injector and the nozzle is formed an annular gap 12. The injector adjacent the burner tunnel 13, made in the form of the diffuser 14 length 8-20 calibers diameter 15 of the mixer 8, with output expanding part of the cone 14 into the chamber 16 digesta works as follows.Camera 16 post-combustion pre-heated to a temperature of 1000-1200aboutWith by burning additional fuel in the air (mostly), is supplied through the gas nozzle 11, the insert 9 and the injector 1, respectively. The amount of air set in an optimum ratio to the auxiliary fuel by regulating the flow rate of the valves 5 and 6, if necessary, mixing with air oxygen to reach the desired temperature. Simultaneously with the heating of the afterburner is heated walls 17 of the cone 14 so that the front of the start of combustion is approaching the injector 1 at a distance of 3-5 calibers diameter 15 of the mixer 8 (increasing to zoom torch proportion of oxygen for combustion of fuel through valve 6). Due to radiation from the flame and from the heated chamber 16 of the combustion chamber wall 17 of the cone 14 are heated to a temperature of at least 1000-1300aboutWith, and then through valve 7 open access to the injector 1 of the waste gases through the pipe 4. At the same time interrupt the air supply valve 5, using the oxygen flowing through nozzle 10 for combustion of auxiliary fuel and oxygen flowing through the annular gap 12 for injection and combustion of waste gases. The last Pro is For full averaging mixture of sufficient length, equal to 8 gauge diameter 15 of the mixer 8. Wall 17 of the diffuser 14 is preheated to a temperature of 1000aboutAlready at a distance of 5 calibers diameter 15 of the mixer, and they started to happen oxidation of combustible gases with a large excess of oxygen. Further, the degree of afterburning increases, as of the end of the mix, and increases the temperature of the walls 17 of the diffuser 14 at least up to 1300aboutWith from burning oxygen torch auxiliary fuel burned in the optimal mode by separation of a part of oxygen from the total number of insert 9 with the nozzle 10. Thus, the walls 17 of the diffuser 14 and creates all conditions for post-combustion of combustible gases, namely temperature 1300aboutWith an excess of oxygen over 12% and the material of the walls 17 having catalytic properties. It was established experimentally that the length of the diffuser 14, equal 8-20 calibers diameter 15 of the mixer 8, the combustion of combustible components is fully (including benzpyrene with the degree of 99.98%). DEVICE FOR post-combustion of WASTE GASES containing the injector nozzle for the supply of waste gases, mixer, burner tunnel and the secondary combustion chamber, characterized in that the device is provided with a nozzle for supplying the oxygen is on the inside of the insert, moreover, the burner tunnel is made in the form of the diffuser adjacent to the injector, having a length of 8 to 20 caliber-the diameter of the mixer and out of the expanding part in the burning chamber.
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.
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: 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 (BF BRN) 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; BF BRN is fuel flowrate to burners, kg/h; QF L is fuel low heating value as fired, kcal/kg; O2" is oxygen content in flue gases at combustion chamber outlet, %; VA O 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