Hearth burner

 

The invention relates to bottom (horizontal slot) single tube burners with forced air for combustion of gaseous fuel and can be used in heating sectional boilers, Susilo and other thermal units, for which the backup fuel is coal. Hearth burner includes a tunnel formed by blocks of refractory material placed therein a gas manifold with two rows of holes arranged in a checkerboard pattern, and vozduhoprovodyaschih channel, and vozduhoprovodyaschih channel is made in the form of a rectangular wedge-shaped cross-section with a slot located in its wedge-shaped part under the holes of the gas collector, and blocks of refractory material and a gas manifold attached to the duct. The invention allows the uniformity of the temperature distribution along the length of the furnace, the improvement of mixing, improving the efficiency and quality of the combustion gas (air excess factor=1,05-1,2, low emission of nitrogen oxides 90-120 mg/m3), reducing the length of the flame, easy to operate, the possibility of equipping the automatic control and security. 4 Il.

Izania gaseous fuel and can be used in heating sectional boilers, Susilo and other thermal units, for which the backup fuel is coal.

Known hearth burner, burner containing the tunnel with side air inlet pipe and placed on him the cross of the gas collector, and in the tunnel in the area of the air inlet pipe installed wedge-shaped insert, aimed the tip of the wedge in the direction of the pipe and placed so that they can move across the tunnel and changes fragile revealed wedge. (A. C. 1550280, F 23 D14/20, publ. Bull. 10, 15.03.90).

The disadvantage of hearth burners is increased heating of the collector, reducing the size of the flue openings, losing their shape during operation due to the formation and deposition of pyrocarbon, the impossibility of providing an organized filing and regulation of air due to natural draft, the uneven distribution of thermal loads, the complexity of the design.

Known hearth burner containing gas collector with two rows of holes made under fragile to each other, placed in the lower part of the tunnel, and the diameters of the holes and the distance between the vertical axis of the cross section of the collector. and the center of these holes made changing from in front of globin the 23 D 14/20, publ. Bull. 42, 15.11.90).

The disadvantage of hearth burners is increased heating of the collector, reducing the size of the flue openings, losing their shape during operation due to the formation and deposition of pyrocarbon, the impossibility of providing an organized filing and regulation of air due to natural draft, the uneven distribution of thermal loads, the complexity of the design.

The closest technical solution to the claimed invention is a hearth burner containing a tunnel made of refractory (refractory bricks of class And placed in it a gas manifold with two rows of holes arranged in a checkerboard pattern, and vozduhoprovodyaschih channel connected to the fan (A. C. Iselin. A gas burner. Leningrad, Nedra,, 1973, S. 65).

A disadvantage of the known burner is uneven temperature distribution along the length of the furnace, the air excess factor=1,25-1,75,chemical incomplete combustion formed in the combustion process, the flame touches the heating surfaces, which leads to rapid wear of the equipment. The disadvantage of the burner is also the complexity of installation and repair work.

The task, which directed izobreteny the combustion gas, improved mixing, reducing the length of the flame, increase reliability, simplify mounting of burners and repair work.

The invention consists in that the hearth burner includes a tunnel formed by blocks of refractory material placed therein a gas manifold with two rows of holes arranged in a checkerboard pattern, and vozduhoprovodyaschih channel, and vozduhoprovodyaschih channel is made in the form of a rectangular wedge-shaped cross-section with a slot located in its wedge-shaped part under the holes of the gas collector, and blocks the gas manifold attached to the duct.

Use duct of rectangular cross-section wedge-shaped with a slot located in its wedge-shaped part under the holes of the gas manifold leads to a uniform field of air velocities along the entire length of the slit, therefore, can improve the mixing of gas with air and improves the quality of the combustion gas Connection pipe with blocks of refractory material and a gas collector allows you to get easy-to-use device. The burner unit is easily installed and removed in the furnace during maintenance.

In Fig. 1 CX A-A; in Fig. 3 is a cross section of the gas manifold of Fig. 4 - duct (top view).

Hearth burner includes a gas collector 1, is connected to the gas source and provided with lateral holes of constant diameter 2, the duct 3, the fan 4, the blocks of heat-resistant concrete 5, forming a tunnel, the gas collector 1 and the duct 3 are connected by a yoke 6, units and duct are connected by brackets 7.

Hearth burner works as follows.

Low-pressure gas is supplied into the gas collector 1 and exits through two rows of holes 2 in the tunnel in which the air is supplied by fan 4 through the slot duct 3 and washes the gas collector 1 , located directly above the slot duct 3. In the tunnel of mixing of gas streams with a stream of air and starts burning. The burner is ignited by the igniter. The flame instantly runs along all collector and steadily lit in all holes. The tunnel, which consists of heat-resistant concrete, heated and provides reliable stabilization of the flame in all modes of operation of the burner. Along the entire length of the tunnel is formed a common torch, which passes the inner surfaces of the sections of the boiler part of the heat by radiation.

Beneath the, is improving the efficiency and quality of the combustion gas (air excess factor=1,05-1,2, low emission of nitrogen oxides 90-120 mg/m3), reducing the length of the flame, ease of operation, providing automatic control and security.

Claims

Hearth burner, comprising a tunnel, formed by blocks of refractory material placed therein a gas manifold with two rows of holes arranged in a checkerboard pattern, and vozduhoprovodyaschih channel, characterized in that vozduhoprovodyaschih channel is made in the form of a rectangular wedge-shaped cross-section with a slot located in its wedge-shaped part under the holes of the gas collector, and blocks of refractory material and a gas manifold attached to the duct.

 

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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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