Ceramic gas burner for hot blast stove and the method of its operation

 

(57) Abstract:

The invention relates to a ceramic gas burner stove shaft furnace. The objective of the invention is to improve combustion characteristics, in particular, to curve burnout from a height above the burner became steeper. Ceramic gas burner for hot blast stove has a Central gas channel, which is open in the Central area of the crown of the burner, and air ducts on both sides of the gas channel, which is opened in the Central zone, and the Central air channel has an outlet inside the gas channel, and the air is supplied to the Central air channel upward flow, which flows in two opposite directions through the side holes. 2 C. and 8 C.p. f-crystals, 3 ill.

The invention relates to metallurgy, and more specifically to a ceramic gas burner and method of its operation.

From European patent N 0306072 known ceramic gas burner for hot blast stove, acting as a regenerative heat exchanger for heating the charge air in the shaft furnace. This burner includes a housing with side walls, gas Central and lateral vascopolonia sides of the outlet gas Central channel. This arrangement of holes allows a reduction of the point of complete turbulent mixing. This has a positive effect on flame stability, as well as on the uniformity and completeness of combustion of the combustible gas.

The degree of completeness of combustion of a combustible gas, the so-called burnout, depends on the height above the burner, which is the maximum burnout. This means that the maximum burnout is achieved only at a certain height above the burner. The amount of burnout, as a function of height above the burner, can be represented in the form of a rising curve, which approaches the maximum burnout asymptotically.

The technical result of the invention is to improve combustion characteristics, i.e., the increase in the slope of the curve of the dependence of the burnout of the height above the burner. This means achieving maximum burnout of combustible gas at a lower height above the burner or to achieve a greater burnout of combustible gas at the same height above the burner.

This technical result is achieved in that in a ceramic gas burner for hot blast stove, comprising a housing with side walls, crown, gas Central and side air channels with the output of the outlet gas Central channel, according to the invention, is made the Central air channel with outlet hole or holes inside the gas channel. It is desirable that the Central air channel had the hole or holes in the Central zone of the crown burner.

Preferably, the Central air channel was placed along the axis of the gas channel.

It is advisable that the Central air channel was made of T-shaped to move air upward in the vertical section, and then on the opposite horizontal branches to the output holes. With this design of the burner is achieved intensive dual air mixing, leading to faster and better combustion of gas. Under the "dual" air mixing refers to additional mixing effect of the air flow inside the Central gas Central channel.

It is also desirable that the Central air channel had a vertical column and the upper portion overhanging the column and diverging in the side of the opposite side, and the outlet would be located at the lateral ends of this top.

This upper part of the can, thus, act in the gas stream to pirineu gas around the protruding parts of the Central air channel, which may also be intentionally non-streamlined shape also enhances the effect of double air mixing.

In one form of execution of the ceramic burner in accordance with the invention, the Central gas channel includes expanding up land in the area of the crown of the burner and the outlet openings of the Central air channel located at the lower ends of the growing up of the site. It also allows you to achieve better blending effect.

It is preferable that the side air channels had the number of output holes arranged in respective rows on opposite sides of the gas channel, and the Central air channel had many outlets aimed at the sides of and spaced in the longitudinal direction in a staggered manner relative to the outlet side of the air channels. It also contributes to a more intensive mixing of gas with air.

Efficient design ceramic burner in accordance with the invention is achieved when the burner contains a side of the air channels formed by side walls and dividing walls separating air CARICOM in the side walls and dividing walls and respectively in the design of the crown burner made fixing sheet piling elements to ensure the horizontal position of the crown burner. This eliminates the movement of the separation wall inside and the disruption of the flow in the Central zone.

Special advantages are achieved in accordance with the invention, if the burner is at least partially made of pre-molded concrete. It was found that this allows to obtain significant savings in the cost of construction.

The invention is also implemented in the method of operation of the ceramic gas burner for hot blast stove comprising a fuel gas in the gas channel and the combustion air in the air side and Central channels, according to the invention, 10-20% of the total volume of air supplied through the Central air channel, and the rest through the side air channels.

In Fig.1 shows curves of the magnitude of the burnout of combustible gas from a height above the ceramic gas burner disclosed in the European patent N 0306072, and above the burner according to the invention; Fig.2 a top view of a ceramic gas burner for hot blast stove, according to the invention; Fig. 3 a cross section on line 1-1 of Fig.2.

The placement and operation of a gas burner in the combustion chamber vozduhonagrevatelej burner, and the ordinate burnout of combustible gas in percentage in relation to total combustion. Curve 1 represents the characteristic of burnout known burner according to patent EP-A-0306072, and curve 2 burner according to the invention. In view of the dual air mixing achieved in the burner according to the invention, the maximum achievable burnout is higher (closer to 100%), and a higher degree of burnout is achieved at a lower height above the burner. The CO content in the combusted gas, which can be obtained with the known burner at maximum burnout, about 5000 ppm CO. With the burner according to the invention this share can be reduced to about 100 ppm CO.

It is shown in Fig.2 and 3 ceramic gas burner for hot blast stove includes a housing 1 with side walls 2, a crown 3, a Central gas channel 4, in which its axis is placed Central air channel 5, and side air channels 6 with the output apertures 7 arranged in respective rows on opposite sides of the Central gas channel 4. Central air channel 5 is directed to the sides of the outlet openings 8 in the Central zone 9 of the crown 3 burner located in the longitudinal direction in a staggered manner relative to the outlet openings is placed air up in a vertical section, and then on the opposite horizontal branches to the output holes 8. The gas rises through the gap 10.

Gas channel 4 (Fig.3) in the area of the crown 3 of the burner is growing up a lot and outlet openings 8 of the Central air channel 5 is placed at the lower ends extending up area.

The side air channels 6 formed by side walls 2 and the dividing wall 19 separating the air duct 6 from the gas channel 4. Crown 3 burner supported on opposite side walls 2 and the separation wall 11. In the side walls 2 and the dividing walls 11 and respectively in the design of the crown 3 burners are fixing sheet elements 12 to ensure the horizontal position of the crown 3 of the burner.

The burner housing and the dividing wall 11 may be made of refractory concrete. Central air channel 5 in this case consists of steel sections, the outer edges of which are concreted, and provide internal passage of the Central air flow. For the upper overhanging right angle portion can be used, for example, T-shaped beam over the vertical part of the Central air the patients were pre-formed refractory concrete.

A method of operating a ceramic gas burner includes a fuel gas in the gas channel 4 and the air required for combustion, side air channels 6 and the Central air channel 5. Preferably 10-20% of the total volume of air supplied through the Central air channel 5, and the rest through the side air channels 6.

Due to the rapid and complete mixing of the burner allows you to lower the height of the combustion chamber and to improve the burnout of combustible gas. With over 10% of the air in relation to the stoichiometric required amount of air has improved mixing of air can reduce the exit by a factor of 50.

1. Ceramic gas burner for hot blast stove, comprising a housing with side walls, crown, gas Central and side air channels with outlet openings, the outlet side of the air channels are located on opposite sides of the outlet gas Central channel, characterized in that the burner is made of the Central air channel with outlet hole or holes inside the gas channel.

2. Burner under item 1, characterized in that the Central air channel has an output on the Central air duct is placed along the axis of the gas channel.

4. The burner according to any one of paragraphs. 1 to 3, characterized in that the Central air channel is made T-shaped to move air upward in the vertical section, and then on the opposite horizontal branches to the output holes.

5. The burner according to any one of paragraphs.1 to 4, characterized in that the Central air channel has a vertical column and the upper portion overhanging the column and diverging side in opposite directions, and output apertures located at the lateral ends of this top.

6. The burner according to any one of paragraphs.1 to 5, characterized in that the gas channel in the area of the crown burner is growing up a lot and outlet openings of the Central air channel is placed at the lower ends extending up area.

7. The burner according to any one of paragraphs.1 to 6, characterized in that the side air channels have a lot of holes arranged in respective rows on opposite sides of the gas channel, and the Central air channel has many outlets aimed at the sides of and spaced in the longitudinal direction in a staggered manner relative to the outlet side of the air channels.

9. The burner according to any one of paragraphs.1 to 8, characterized in that it at least partially made of pre-formed concrete.

10. A method of operating a ceramic gas burner for hot blast stove comprising a fuel gas in the gas channel and the combustion air in the air side and Central channels, characterized in that 10-20% of the total volume of air supplied through the Central air channel, and the rest through the side air channels.

 

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The invention relates to heat engineering, in particular to equipment for the combustion of gaseous fuels

The invention relates to the design block injection burners for equipment of gas-fired furnaces hot water and steam boilers, which are used primarily in heating systems of residential, public and industrial buildings

FIELD: power engineering.

SUBSTANCE: method comprises injecting at least one type of fuel and at least one oxidizer. The primary oxidizer is injected together with the fuel to generate first incomplete burning. The gases emitting from the first burning comprises at least a part of the fuel, whereas the secondary oxidizer is injected downstream of the site of the fuel injection at a distance larger than that between the fuel injection and primary oxidizer closest to the fuel injection so that to be burnt out together with the fuel part. The flow of the first oxidizer is branched into at lest two primary flows.

EFFECT: reduced emission of nitrogen oxides.

40 cl, 8 dwg

FIELD: the invention refers to the technology of using a cumulative jet.

SUBSTANCE: the mode of formation of at least one cumulative jet includes feeding of at least one gas jet out of at least one nozzle with a converging/diverging configuration located in an injector having a face surface of the injector. At that the face surface of the injector has openings located along the circumference around at least one nozzle, moreover the indicated at least one gas jet has a supersonic speed when it is formed at the output from the face surface of the injector and remains supersonic on a distance coming to at least 20d, where d- the diameter of the output opening of the indicated at least one nozzle. Feeding of fuel from the first group of openings located along the circumference and feeding of an oxidizing agent from the second group of openings located along the circumference. Incineration of fuel and the oxidizing agent fed from the first and the second groups of openings located along the mentioned circumference for formation of a flame shell around at least one gas jet. A great number of gas jets are fed from the injector. The fuel and the oxidizing agents are fed from the first group of openings and from the second group of openings correspondingly alternate with each other on the circumference along which they are located. At least one gas jet, the fuel and the oxidizing agent are fed from the injector directly into the space for injection without passing the zone of recycling formed with the extender of the injector. At least one gas jet passes at a prescribed distance coming at least to 20d, where d- is the diameter of the output opening of the nozzle from which exits a gas jet keeping the diameter of the mentioned gas jet in essence constant.

EFFECT: the invention allows make an arrangement with the aid of which it is possible to form effective cumulative gas jets without need in an extender in the injector or in any other element for forming recycling zone for gases fed from the injector.

9 cl, 3 dwg

FIELD: power engineering.

SUBSTANCE: method of fuel combustion when at least one fuel and at least two oxidants are injected: the first oxidant is injected at I1 distance equal to 20 cm at maximum and preferably 15 cm at maximum from point of fuel injection. The second oxidant is injected at I2 distance from point of fuel injection while I2 is greater than I1. Oxidants are injected in such amounts that sum of their amounts is equal to at least stoichiometric amount of oxidant required to provide combustion of injected fuel. The first oxidant is oxygen-enriched air at maximum temperature of 200 C, and the second oxidant is air preheated to temperature of at least 300 C. Air is enriched with oxygen so that oxygen concentration in enriched air is at least 30%. Oxygen-enriched air is obtained by mixing ambient air with oxygen from cryogenic source. Preheated air is heated by means of heat exchange using part of hot combustion products. At least two oxidants are injected at I1 distance equal to 20 cm at maximum and preferably 15 cm at maximum while one oxidant called primary is injected mixed with fuel or near fuel and another oxidant called secondary is injected at distance from fuel. Amount of oxidant injected by means of primary oxidant jet ranges from 2 to 50% of oxygen stoichiometric amount required to provide combustion of injected fuel. The secondary oxidant is separated into multiple jets of secondary oxidant. The second oxidant injected at distance I2 is separated into multiple jets of oxidant.

EFFECT: fuel combustion using oxygen as oxidant suitable for retrieving energy from furnace gases.

8 cl

FIELD: heating.

SUBSTANCE: invention relates to power engineering. The proposed method of fuel firing with oxygen-containing gas wherein fuel jet is injected and, at least, two jets of oxygen containing gas that features high oxygen content. Note here that the 1st jet of aforesaid gas, called a primary jet, is injected to allow its contact with the fuel jet and to form the 1st incomplete firing. Note here that outlet gases, thereafter, contains, nevertheless, at least, one fraction of fuel. Note also that the 2nd aforesaid jet is injected at the distance from the fuel jet to allow firing together with the said 1st fuel fraction existing in outlet gases after 1st firing. The oxidiser primary jet is divided into two primary jets, that is, 1st primary jet, called the central primary oxidiser jet injected into fuel jet centre and 2nd primary jet called the embracing primary jet injected coaxially and around the fuel jet. The rate of the oxidiser central primary jet injection exceeds that of fuel jet injection. The fuel jet injection rate exceeds that of the 1st embracing oxidizer injection. The oxidiser 2nd jet injection rate exceeds that of the oxidiser embracing primary jet. The distance between the oxidiser central primary jet injection and its 2nd jet injection vs the rate of injection of the oxidiser 2nd jet varies between 10-3 and 10-2. The oxidiser 3rd jet is injected at the point located between the point of injecting the oxidiser central primary jet and that of injecting 2nd oxidising jet. The rate of injecting oxidiser 2nd jet exceeds that injecting oxidiser 3rd jet. The distance between the point of injecting oxidiser 2nd jet and that of injecting oxidiser central primary jet vs the distance between the point of injecting oxidiser 3rd jet and that of injecting oxidiser primary jet varies from 2 to 10. Two primary oxidiser jets feature identical oxygen concentration. The oxidizer central primary jet oxygen concentration exceeds that of oxidiser embracing primary jet.

EFFECT: higher furnace reliability.

10 cl, 1 dwg

FIELD: heating.

SUBSTANCE: invention relates to powder engineering. The method of fuel firing with oxygen-containing gas wherein fuel jet is injected and, at least, two jets of oxygen containing gas that features high oxygen content. Note here that the 1st jet of aforesaid gas, called a primary jet, is injected to allow its contact with the fuel jet and to form the 1st incomplete firing. Note here that outlet gases, thereafter, contains, nevertheless, at least, one fraction of fuel. Note also that the 2nd aforesaid jet is injected at the distance of l1 from the fuel jet to allow firing together with the said 1sr fuel fraction existing in outlet gases after 1st firing. Oxygen containing gas with low oxygen content is injected at the distance l2 from the fuel jet providing the firing together with the said outlet gases after 1st firing, where l2>l1.

EFFECT: firing gas with low oxygen content.

25 cl, 1 dwg

FIELD: heating systems.

SUBSTANCE: invention refers to gas burners with separate air and gaseous fuel supply. The effect is achieved in gas burner (1) containing main metal housing (6), an inner tube for fuel gas, at least two outer tubes (10) for fuel gas, single tube (8) for supplying pre-heated air, fuel gas supply control system, refractory block (30) and a group of nozzles (20) which are located in a circumferential direction coaxially in relation to inner tube and meant for spraying pre-heated air into combustion chamber.

EFFECT: limit reduction of NOx concentration in exit combustion products.

29 cl,13 dwg

FIELD: heating.

SUBSTANCE: invention related to energy, particularly to burner devices and can be used in gas turbine equipment. Burner device consists of a case (1), a fuel nozzle (2), a front device (3), a fire tube (4). The burner device belongs to gas-turbine engine combustion chamber. The front device executed with holes for fuel nozzles installation (2). The fire tube (4) with the front device (3) located inside of the combustion chamber cage (5). Fuel nozzles (2) connected to a gas ring collector (6). In combustion chamber fire tube and cage (5) between wall area air nozzles (7) located radically. Air nozzles (7) connected to the common ring air collector (9). The air collector (9) located in the case (1).

EFFECT: invention allows to regulate primary air supply to the combustion chamber section during equipment operation, burning device design simplification, it operation safety stays constant, possibility of device change on the running gas turbine equipment.

1 dwg

FIELD: heating.

SUBSTANCE: invention relates to fuel combustion process. Fuel combustion method is implemented by means of oxygen-containing gas with high oxygen content, in accordance with which to combustion chamber there sprayed is fuel jet and at least two jets of oxygen-containing gas; at that, the first or primary jet of oxygen-containing gas is supplied through the hole having diametre D and sprayed around the above fuel jet in such quantity which allows providing the first incomplete fuel combustion; at that, gases formed as a result of the above first combustion contain at least some part of unburnt fuel, and the second jet of oxygen-containing gas introduced through the hole having diametre d and located at some distance 1 from the hole of introduction of the first or primary jet of oxygen-containing gas so it can be possible to enter into combustion reaction with the fuel portion which is contained in gases formed as a result of the above first incomplete combustion; at that, fuel jet opens inside the jet of primary oxygen-containing gas at some point located at some distance in backward direction from combustion chamber wall; at that, the above point is located at distance r from that wall, and oxygen-containing gas with high oxygen content is pre-heated at least to 300C. Ratio r/D has the value either lying within the range of 5 to 20, or lying within the range of 0.75 to 3, and ratio 1/d has the value equal at least to 2. Oxygen-containing gas with high oxygen content represents oxygen concentration which is at least 70% by volume. Fuel is subject to pre-heating up to temperature comprising at least 300C.

EFFECT: increasing fuel combustion efficiency.

15 cl, 1 dwg

FIELD: power engineering.

SUBSTANCE: burner for fuel combustion comprises fuel supply line. The fuel supply line consists of several fuel sections. Also each fuel section is connected to another section and is designed for supply of fuel flow. Further, the burner includes a fuel inlet section. This section has the first fuel inlet and the first fuel outlet located at a distance from the first fuel inlet. The fuel inlet section has the first through cross section area and is designed to supply fuel flowing into the first fuel inlet and coming out the first fuel outlet. The burner has an intermediate section of fuel with fuel inlet and outlet device, notably the fuel outlet device is located at a distance from the fuel inlet device. The intermediate fuel section is designed for supply of at least part of flow coming into the inlet fuel device and going out of the outlet fuel device and has the second through cross section area. The second through cross section area changes from the initial through cross section area in the fuel inlet device to different through cross section area in the fuel outlet device. The burner has the fuel outlet section. The fuel outlet section has the second inlet of fuel and the second outlet of fuel located at a distance form the second inlet of fuel. The fuel outlet section is designed for supply of at least part of fuel flow coming onto the second fuel inlet and going out the second fuel outlet and it has the third through cross section area. This third through cross section area in essence is uniform along the whole outlet section of fuel. The burner comprises the first line of oxidant with several oxidant sections. Each oxidant section is connected to another oxidant section. It is designed to supply flow of oxidant. It includes an oxidant pressure chamber letting though oxidant flow and having the fourth through cross section area. At least part of oxidant pressure chamber is located in essence at least next to a part of at least one inlet section of fuel, intermediate section of fuel and outlet section of fuel. The oxidant outlet section lets through at least part of oxidant flow and has the fifth through cross section area. Also the fifth through cross section area is less or equal to the fourth through cross section area and in essence is uniform along the whole outlet section of oxidant. At least part of oxidant outlet section in essence is positioned next to the fuel outlet section.

EFFECT: facilitating upgraded quality of fuel combustion and reduced level of nitrogen oxide exhaust into atmosphere.

28 cl, 19 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing acetylene and synthetic gas via thermal partial oxidation of hydrocarbons which are gaseous at temperatures used for preheating, in a reactor which is fitted with a burner with through holes, characterised by that the starting substances to be converted are quickly and completely mixed only directly in front of the flame reaction zone in through holes of the burner, where in the mixing zone within the through holes the average flow rate is higher than the propagation speed of the flame under the existing reaction conditions. The invention also relates to a device for realising the said method.

EFFECT: possibility of avoiding preliminary and reverse inflammations.

9 cl, 3 ex, 1 dwg

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