CN113587087A - Premixing type hydrogen-rich waste gas blending combustion burner - Google Patents
Premixing type hydrogen-rich waste gas blending combustion burner Download PDFInfo
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- CN113587087A CN113587087A CN202110858240.5A CN202110858240A CN113587087A CN 113587087 A CN113587087 A CN 113587087A CN 202110858240 A CN202110858240 A CN 202110858240A CN 113587087 A CN113587087 A CN 113587087A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/74—Preventing flame lift-off
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/78—Cooling burner parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/007—Mixing tubes, air supply regulation
Abstract
The invention discloses a premixed hydrogen-rich waste gas blending burner, wherein the outlet end of a fuel cylinder extends into a combustion-supporting air cylinder and is coaxially installed with the combustion-supporting air cylinder, a combustion-supporting air inlet is arranged at the upstream position of the outlet end of the fuel cylinder on the combustion-supporting air cylinder, a cooling shell is arranged in the combustion-supporting air cylinder and is coaxial with the combustion-supporting air cylinder, one end of the cooling shell is connected with the combustion-supporting air cylinder, the connection point of the end of the cooling shell and the combustion-supporting air cylinder is positioned at the downstream of the combustion-supporting air inlet, and the other end of the cooling shell extends to the outlet end of the combustion-supporting air cylinder; the outlet end of the fuel cylinder extends into the cooling shell; the outlet end of the fuel cylinder is provided with a radial spray gun, one end of the stable combustion blunt body is connected with the outlet end of the fuel cylinder, and the other end of the stable combustion blunt body extends to the end part of the combustion-supporting air cylinder; the primary premixing swirler is arranged between the fuel cylinder and the cooling shell and is positioned at the upstream of the radial spray gun; a premixing chamber and a secondary premixing swirler are sequentially arranged between the fuel cylinder and the cooling shell at the downstream of the radial spray gun. The invention can prevent the coking of the unit and the stable burning of the flame.
Description
Technical Field
The invention belongs to the field of safe and stable low-nitrogen combustion of hydrogen-rich waste gas and design of combustors, and particularly relates to a premixed hydrogen-rich waste gas co-combustion combustor.
Background
In chemical industry, metallurgy and other industries, a combustible waste gas mixture rich in hydrogen is often generated in a plurality of production processes, such as blast furnace gas, methanol tail gas, calcium carbide tail gas and the like. Although such waste gas is rich in hydrogen, it cannot be used to build a separate combustion system due to its low calorific value and unstable yield. The plant usually sends it to a flare system for air-to-air combustion, which not only causes environmental pollution, but also is accompanied by serious energy waste.
Under the new energy situation and requirements, the waste gas co-combustion is used as an auxiliary combustion system of the boiler, and the hydrogen-rich waste gas originally sent to a torch is sent to the boiler to participate in combustion, so that energy conservation and emission reduction are realized, and the hydrogen-rich waste gas is valued by more and more factories. The research on domestic gas burners is mostly focused on the application of the domestic gas burners in pure gas boilers with single environment, and the attention on waste gas co-combustion burners in coal-gas co-combustion systems with complex working conditions is less. In the existing mixed combustion system design, most of combustible waste gas is directly sprayed into the furnace through a pipeline, although the problem of energy waste is solved, the discharge problem and the combustion stability of the system are greatly reduced, and even accidents such as unit coking and the like frequently occur. Therefore, it is necessary to develop a novel hydrogen-rich gas co-combustion burner for the exhaust gas co-combustion system, so as to meet the requirement of safe and stable operation of the unit while recycling the exhaust gas.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a premixed hydrogen-rich waste gas blending combustion burner which can prevent the unit from coking and the flame from being stable in combustion.
The technical scheme adopted by the invention is as follows:
a premixed hydrogen-rich waste gas blending combustion burner comprises a fuel cylinder, a combustion-supporting air cylinder, a primary premixed swirler, a secondary premixed swirler, a premixing chamber, a stable combustion bluff body and a cooling shell;
the outlet end of the fuel cylinder extends into the combustion-supporting air cylinder and is coaxially installed with the combustion-supporting air cylinder, a combustion-supporting air inlet is arranged at the upstream position of the outlet end of the fuel cylinder on the combustion-supporting air cylinder, the cooling shell is arranged in the combustion-supporting air cylinder and is coaxial with the combustion-supporting air cylinder, one end of the cooling shell is connected with the combustion-supporting air cylinder, the connection point of the end of the cooling shell and the combustion-supporting air cylinder is positioned at the downstream of the combustion-supporting air inlet, and the other end of the cooling shell extends to the outlet end of the combustion-supporting air cylinder; the outlet end of the fuel cylinder extends into the cooling shell;
the outlet end of the fuel cylinder is provided with a radial spray gun, one end of the stable combustion blunt body is connected with the outlet end of the fuel cylinder, and the other end of the stable combustion blunt body extends to the end part of the combustion-supporting air cylinder;
the primary premixing swirler is arranged between the fuel cylinder and the cooling shell and is positioned at the upstream of the radial spray gun; a premixing chamber and a secondary premixing swirler are sequentially arranged between the fuel cylinder and the cooling shell at the downstream of the radial spray gun.
Preferably, the premixed hydrogen-rich waste gas blending combustion burner also comprises an annular combustion-supporting air flow passage interlayer, wherein the annular combustion-supporting air flow passage interlayer is arranged between the fuel cylinder and the combustion-supporting air cylinder and is coaxial with the fuel cylinder; one end of the annular combustion-supporting air flow passage interlayer is connected with the end part of the cooling shell close to the combustion-supporting air inlet, and the other end of the annular combustion-supporting air flow passage interlayer extends to the upstream of the combustion-supporting air inlet; annular channels for combustion-supporting air circulation are formed between the annular combustion-supporting air flow passage interlayer and the combustion-supporting air duct and between the annular combustion-supporting air flow passage interlayer and the fuel barrel.
Preferably, a cooling air chamber capable of cooling by using combustion-supporting air entering from a combustion-supporting air inlet is arranged in the cooling shell, the cooling air inlet of the cooling air chamber is positioned at the end part of the cooling shell close to one side of the combustion-supporting air inlet, and a cooling air outlet of the cooling air chamber is positioned between the premixing chamber and the secondary premixing swirler and can blow air to the inner cavity of the cooling shell;
the cooling air inlet and the cooling air outlet are both circular rings.
Preferably, the premixing chamber is a venturi premixing chamber, and the secondary premixing cyclone is arranged at the outlet of the venturi premixing chamber.
Preferably, the cooling air outlet is positioned at the inlet of the secondary premix cyclone, and the air outlet direction is perpendicular to the axial direction of the fuel cylinder.
Preferably, the part between the outer side wall of the cooling air chamber and the combustion-supporting air duct is of a cavity structure.
Preferably, the radial spray gun is arranged along the radial direction of the fuel cylinder, the radial spray gun is provided with a plurality of tangential gas nozzles along the length direction of the radial spray gun, and the injection direction of the tangential gas nozzles is vertical to the axial direction of the fuel cylinder.
Preferably, 6-12 radial spray guns are uniformly arranged on the fuel cylinder along the circumferential direction of the fuel cylinder, 4-8 tangential gas nozzles are arranged on each radial spray gun, and the tangential gas nozzles are uniformly arranged along the axial direction of the radial spray gun;
the primary premixing swirler and the secondary premixing swirler adopt vane type swirlers, the number of the vanes is 8-24, the vanes are uniformly distributed along the circumferential direction, and the outlet swirl angle of the primary premixing swirler is 15-75 degrees; the outlet swirl angle of the secondary premixing swirler is 15-75 degrees.
Preferably, the combustion-supporting air duct is provided with a fire observation mirror and a flame detector interface, and the fire observation mirror and the flame detector interface are arranged at positions opposite to the primary premixed cyclone and the secondary premixed cyclone; and the swirl vanes of the primary premix swirler and the secondary premix swirler at the projection positions of the fire observation mirror and the flame detector interface are subjected to tapping treatment, and the diameter of each tapping is 20-40 mm.
Preferably, the stable combustion blunt body is a hollow stable combustion blunt body, the hollow stable combustion blunt body and the fuel cylinder have the same diameter, and a spacing layer for isolating the hollow stable combustion blunt body from the inner cavity of the fuel cylinder is arranged between the hollow stable combustion blunt body and the fuel cylinder; the outlet of the secondary premixing swirler is flush with the end surface of the hollow stable combustion bluff body, and jointly forms a throat of the burner.
The invention has the following beneficial effects:
according to the premixing type hydrogen-rich waste gas blending combustion burner, the primary premixing cyclone, the secondary premixing cyclone and the premixing chamber are arranged, combustion-supporting air passing through the primary premixing cyclone can be mixed with gas ejected by the radial spray gun, the mixed gas can be mixed again through the premixing chamber, and then enhanced mixing and rectification are carried out through the secondary premixing cyclone, so that the combustion-supporting air and the gas can be mixed intensively for many times, and the combustion effect is ensured; in addition, the combustion speed of hydrogen is high, the flame temperature is high, compared with the direct injection of hydrogen-rich gas into the furnace, the premixed combustion-supporting air and the gas can be realized, and the hydrogen-rich waste gas can be combusted under the peroxy working condition by controlling the excess air coefficient, so that the flame temperature during the combustion of hydrogen components is effectively reduced, the generation of NOx is inhibited, and the coking of a unit is prevented; the introduced excess air is consumed by the pulverized coal combustion in the boiler, so that the efficiency of the whole boiler is not reduced. The stable combustion bluff body is arranged, one end of the stable combustion bluff body is connected with the outlet end of the fuel cylinder, the other end of the stable combustion bluff body extends to the end part of the combustion-supporting air cylinder, and the secondary premixing cyclone is arranged at the outlet position. The hydrogen flame propagation speed is high, so that the risk of backfire exists in a premixing mode, and on one hand, the combustor adopts the cooling shell arranged at the mixing section of the combustion-supporting air and the fuel gas, so that the mixed gas of the combustion-supporting air and the fuel gas can be cooled, the spontaneous combustion of the internal gas in the premixing chamber is prevented due to the overhigh temperature, and the safety of the combustor is greatly improved. In conclusion, the combustor can prevent the coking of the unit and the stable burning of flame.
Furthermore, the annular combustion-supporting air flow channel interlayer is arranged, the combustion-supporting air inlet and the fuel gas nozzle are effectively isolated by the annular combustion-supporting air flow channel interlayer, even if the inside of the premixing chamber is tempered, flame is not propagated inwards all the time along the interlayer air flow channel, and the safety of the combustor is greatly improved.
Furthermore, the cooling air chamber which can be cooled by combustion-supporting air entering from the combustion-supporting air inlet is arranged in the cooling shell, the cooling air outlet is positioned between the premixing chamber and the secondary premixing cyclone and can blow air to the inner cavity of the cooling shell, the arrangement of the cooling air outlet can enable the mixed gas of the combustion-supporting air and the fuel to be in reinforced mixing again by the air blown out from the cooling air outlet at the cooling air outlet, the combustion effect can be further ensured, the cooling effect of the mixed gas can be realized, the spontaneous combustion of the mixed gas can be prevented, the uniform air inlet and the uniform air outlet can be ensured by the circular shape of the cooling air inlet and the cooling air outlet, and the mixing effect can be ensured.
Furthermore, the part between the outer side wall of the cooling air cavity and the combustion-supporting air duct is of a cavity structure, so that the conduction of heat at the end part (combustion end) of the combustion-supporting air duct to the inside of the premixing chamber can be reduced, the temperature of the premixing chamber can be controlled, and the safety is ensured.
Furthermore, the stable combustion blunt body is a hollow stable combustion blunt body, and the hollow stable combustion blunt body is adopted to reduce the conduction of the flame temperature to the premixing chamber, thereby being beneficial to controlling the temperature of the premixing chamber and ensuring the safety.
Drawings
FIG. 1 is a schematic sectional view showing the structure of a premixed hydrogen rich off-gas blending burner of the present invention.
FIG. 2 is a schematic structural diagram of a throat of the premixed hydrogen-rich waste gas blending burner of the present invention.
FIG. 3 is a schematic top view of the premixed hydrogen rich waste gas blending burner of the present invention.
Fig. 4 is a three-dimensional sectional view of the venturi-type premixing chamber and the cooling housing in the premixing type hydrogen-rich exhaust gas blending combustion burner according to the present invention.
Wherein, 1 is a fuel cylinder, 1-1 is a radial spray gun, 1-2 is a tangential gas nozzle, 2 is a combustion-supporting wind cylinder, 3 is an annular combustion-supporting wind flow passage interlayer, 4 is a primary premixed swirler, 5 is a secondary premixed swirler, 6 is a Venturi type premixing chamber, 7 is a hollow stable combustion bluff body, 8 is a cooling shell, 8-1 is a cooling wind inlet, 8-2 is a cooling wind outlet, 8-3 is a cooling shell cavity, 9 is a boiler connecting flange, 10 is a fuel inlet, 11 is a combustion-supporting wind inlet, 12 is a fire observation mirror, 13 is a flame detector interface, and 14 is an interlayer.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings.
Examples
Referring to fig. 1, 2, 3 and 4, the premixed hydrogen-rich waste gas blending combustion burner of the present invention is provided with a fuel cylinder 1, an annular combustion-supporting air flow passage interlayer 3, a combustion-supporting air cylinder 2 and a cooling housing 8 from inside to outside, and a primary premixing swirler 4, a radial spray gun 1-1, a venturi premixing chamber 6, a hollow stable combustion bluff body 7 and a secondary premixing swirler 5 from back to front. The fuel cylinder 1 and the combustion-supporting air cylinder 2 are coaxially arranged and are wrapped by the combustion-supporting air cylinder 2; the primary premixing swirler 4 is positioned axially by taking a boss of the annular combustion-supporting air flow channel 3 as an axial direction, is coaxially installed with the fuel cylinder 1, and is supported and fixed by taking the outer wall surface of the fuel cylinder 1 as a support; the airflow flows through the primary premixing swirler 4 to form a rotational flow and enters the Venturi premixing chamber 6; the hollow stable combustion bluff body 7 has the same diameter with the fuel cylinder 1, the inside of the hollow stable combustion bluff body is isolated by a spacing layer 14, and the length of the hollow stable combustion bluff body penetrates through the whole Venturi type premixing chamber 6; the secondary premixing swirler 5 is arranged at the outlet of the Venturi premixing chamber 6, is positioned by taking the end face of the outlet as the axial direction, is coaxially arranged with the hollow stable combustion bluff body 7 and is fixed by taking the outer wall surface as a support; the premixed gas flows through the secondary premixing swirler 5 and then enters the hearth for combustion. The outlet of the premixing chamber is provided with a secondary premixing cyclone and a hollow stable combustion bluff body, so that premixing is enhanced and fire escape is prevented. The burner can be widely applied to a pulverized coal boiler mixed combustion system, realizes premixed combustion of hydrogen-rich waste gas, and has the characteristics of high stable combustion, low emission, tempering resistance, no maintenance, suitability for hydrogen-rich fuel and the like.
The fuel cylinder 1 is provided with a fuel inlet 10, the radial spray gun 1-1 is provided with a tangential gas nozzle 1-2, the combustion-supporting air cylinder 2 is provided with a combustion-supporting air inlet 11, a spacing layer 14 is arranged between the fuel cylinder 1 and the hollow stable combustion blunt body 7, the front end of the cooling shell 8 is provided with a cooling air inlet 8-1, the tail end of the cooling shell 8 is provided with a cooling air outlet 8-2, and the rest part is a cooling shell cavity 8-3.
After being fed through the fuel inlet 10, the fuel finally leads to the radial spray guns 1-1 along the gas cylinder 1, the radial spray guns 1-1 are uniformly distributed along the circumferential direction, and each spray gun is uniformly distributed with the tangential gas nozzles 1-2 along the radial direction, so that the gas is basically uniformly distributed on the cross section positioned by the central line of the nozzle when being sprayed through the multi-stage dispersion, and a good prerequisite is created for the premixing.
After combustion-supporting air is fed in through a combustion-supporting air inlet 11, most of the combustion-supporting air flows along a flow channel divided by an annular combustion-supporting air flow channel interlayer 3, taking the direction shown in figure 1 as an example, the combustion-supporting air firstly enters an annular cavity between the annular combustion-supporting air flow channel interlayer 3 and a combustion-supporting air duct 2 through the combustion-supporting air inlet 11, wherein a small part of the combustion-supporting air enters a cooling air inlet 8-1, most of the combustion-supporting air flows from the right side of the annular cavity to the left side and inwards enters the annular cavity between a fuel cylinder 1 and the annular combustion-supporting air flow channel interlayer 3, and flows from left to right in the shape-changing cavity, and the annular combustion-supporting air flow channel interlayer 3 not only separates the combustion-supporting air inlet 11 from a tangential gas nozzle 1-2, but also prolongs an air flow channel, and effectively prevents the phenomenon of backfire. Combustion-supporting air generates strong rotational flow after flowing through the primary premixing cyclone, and is mixed with gas sprayed out from the tangential gas nozzles 1-2, so that primary premixing is realized; the premixed gas flows forwards to enter the Venturi type premixing chamber 6, and the diffusion and mixing of the gas are further enhanced by the convergent-divergent flow channel design, which is called secondary premixing; the mixed gas continuously flows forwards and is mixed with combustion-supporting air sprayed out from the cooling air outlet 8-2 at the position in front of the secondary premixing cyclone 5, and the cooling air outlet 8-2 is annularly arranged along the circumferential direction, so that the premixing effect is systematically strengthened again, namely, three-stage premixing; the back mixed gas enters the second-stage premixing swirler 5 forwards, is mixed intensively again, and plays a role in rectification, namely four-stage premixing; finally, the premixed gas enters the hearth for combustion at the swirl strength designed by the secondary premixed swirler 5, so that the combustion effect is ensured.
The front end of the cooling shell 8 is provided with a cooling air inlet 8-1 which is communicated with the combustion-supporting air duct 2 from the inside, the inlet is annular, the omnibearing cooling effect is ensured, a cooling air channel is tightly attached to the Venturi type premixing chamber 6 and is finally ejected to the center along the radial direction through a cooling air outlet 8-2, and the outlet position is designed at the upstream of the secondary premixing swirler 5; the cooling housing has a cavity 8-3 therein to reduce heat transfer.
The left end of the hollow stable combustion blunt body 7 is connected with the tail end of the fuel cylinder 1 (namely, the right end shown in figure 1), the left end of the hollow stable combustion blunt body 7 is completely disconnected with the inside of the tail end of the fuel cylinder 1 by the spacing layer 14, and the other end of the hollow stable combustion blunt body 7 (namely, the right end shown in figure 1) is flush with the outlet end surface of the secondary premixing swirler 5, so that a backflow area is created, an anchoring point is provided for the root of the swirling flame, and the stable combustion effect is enhanced; in order to minimize the heat conduction, the bluff body is designed to be hollow.
The core design of the cooling air shell 8 is an internal cooling air flow channel, so that the cooling air shell, the combustion-supporting air duct 2 and the Venturi type premixing chamber 6 can be fully welded from the outer side, and the effects of sealing, fixing and integrated integration are achieved.
A fire observation mirror 12 and a flame detector 13 are designed on the combustion-supporting air duct 2, wherein the fire observation mirror is used for judging the premixing effect and adjusting the excess air coefficient, and the flame detector is used for safety interlocking.
In the scheme, a flange type fuel inlet 10 is arranged at the front end of a fuel cylinder 1, 6-12 radial spray guns 1-1 are arranged at the tail end of the fuel cylinder, and the radial spray guns are uniformly arranged along the circumferential direction; 4-8 tangential gas nozzles 1-2 are arranged on each radial spray gun and are uniformly arranged along the radial direction. A combustion-supporting air inlet 11 is arranged on the outer side of the combustion-supporting air duct 2, and the interior of the combustion-supporting air duct is divided into a C-shaped flow passage by an annular combustion-supporting air flow passage interlayer 3; the junction of the combustion-supporting air inlet 11 and the combustion-supporting air duct 2 is communicated with the cooling shell 8 to form a circular cooling air inlet 8-1; the primary premixed swirler 4 and the secondary premixed swirler 5 are vane type swirlers, the vanes are uniformly distributed along the circumferential direction, the outlet swirl angle of the primary premixed swirler 4 is 60 degrees, and the material is carbon steel; the outlet swirl angle of the secondary premixing cyclone 5 is 45 degrees, and the material is stainless steel; the number of the blades is 8-24. The Venturi type premixing chamber 6 is made of stainless steel and is arranged at the downstream of the radial spray gun 1-1, a secondary premixing cyclone 5 is arranged at the outlet of the Venturi type premixing chamber, and a circumferential annular cooling air outlet 8-2 is arranged in front of the secondary premixing cyclone 5. The cooling shell 8 is arranged at the periphery of the Venturi type premixing chamber 6, an annular cooling air inlet 8-1 of the cooling shell is communicated with the combustion-supporting air duct 2, an annular cooling air outlet 8-2 of the cooling shell is communicated with the Venturi type premixing chamber 6, and the Venturi type premixing chamber 6 is completely wrapped by the cooling air interlayer; on the basis of keeping enough wall thickness strength, the rest space of the cooling shell 8 is a cavity 8-3, and the whole material is stainless steel. A fire observation mirror 12 and a flame detector interface 13 are reserved at the rear part of the combustion-supporting air duct 2, and the vertical projection of the combustion-supporting air duct to the throat of the burner falls on the secondary premixing swirler 5, so that effective fire observation can be ensured; correspondingly, the swirl vanes of the primary premix cyclone 4 and the secondary premix cyclone 5 at the projection positions are all subjected to tapping treatment, and the tapping diameter is 40 mm.
Specifically, in the premixed hydrogen-rich waste gas blending combustion burner of the embodiment, the fuel cylinder is externally connected with the hydrogen-rich waste gas, a plurality of spray guns radially extend out of the tail end of the fuel cylinder, a plurality of tangential gas nozzles are arranged on the spray guns, and the direction of the sprayed gas flow is consistent with the rotational flow direction of the primary premixed cyclone, so that the rotational flow and mixing are enhanced; the combustion-supporting air duct is arranged around the fuel gas cylinder and is superposed with the central axis of the fuel gas cylinder; an annular combustion-supporting air flow channel interlayer is arranged in the combustion-supporting air duct, an air inlet and a fuel gas nozzle are isolated, and the air circulation distance is prolonged, so that the premixing position is effectively controlled, and tempering is prevented; the boss position of the annular combustion-supporting air flow channel interlayer is used as axial positioning, a primary premixed swirler is arranged between the fuel cylinder and the combustion-supporting air cylinder, the swirler is coaxial with the fuel cylinder, and the outer wall surface of the fuel cylinder is used as support for fixing; after primary premixing is carried out on the cyclone air and the tangential gas, the cyclone air and the tangential gas enter a Venturi type premixing chamber for secondary premixing; the periphery of the premixing chamber is wrapped by a cooling shell, one end of the cooling shell is connected and communicated with a combustion-supporting air cylinder to form an annular cooling air inlet, and cooling air flows in from the axial direction; the outlet of the cooling air is arranged on the wall surface of the premixing chamber at the upstream of the secondary premixing swirler and is annularly arranged, and the cooling air flows out from the radial direction and is sprayed to the center, so that the tertiary premixing is realized; a secondary premixing swirler is arranged at the outlet of the premixing chamber, and premixed gas flows through the secondary premixing swirler to realize four-stage premixing and then enters a hearth to participate in combustion; the outlet of the premixing chamber is simultaneously provided with a hollow stable combustion blunt body, the blunt body and the gas cylinder have the same diameter, the outer part of the blunt body is connected into a whole but the inner part of the blunt body is separated, and the blunt body axially penetrates through the whole premixing chamber; the inner part of the bluff body is a cavity, so that heat conduction is reduced; the secondary premixing swirler is coaxial with the bluff body and is supported and fixed by the outer wall of the bluff body, and the outlet of the secondary premixing swirler is flush with the end face of the hollow bluff body to jointly form a throat of the burner.
According to the scheme, the invention has the following characteristics: (1) compared with direct injection of hydrogen-rich gas into the furnace, the premixing of air and gas can enable the hydrogen-rich waste gas to be combusted under the peroxy working condition by controlling the excess air coefficient, so that the flame temperature during combustion of hydrogen components is effectively reduced, the generation of NOx is inhibited, and the coking of a unit is prevented; the introduced excess air is consumed by the pulverized coal combustion in the boiler, so that the efficiency of the whole boiler is not reduced. (2) The burner adopts the two-stage premixing cyclone to be matched with the Venturi premixing chamber and the cooling air outlet, four-stage premixing is realized before fuel enters the hearth, the premixing effect is ensured, meanwhile, the integrated compact structure is maintained, and no easily-damaged and easily-consumed part and structure exist, so that the risk of overhauling and replacing parts does not exist, the service life of the equipment is long, compared with the traditional premixing burner, the burner is more suitable for the complex operation working condition of coal-gas mixing combustion, and the long-term stable operation effect can be ensured. (3) The burner throat adopts the combined design of rotational flow and a bluff body to create a backflow area and anchor the root of the flame on the bluff body, thereby effectively preventing the fire from escaping and enhancing the flame stability; and the hollow bluff body can reduce the conduction of the flame temperature to the premixing chamber, thereby being beneficial to controlling the temperature of the premixing chamber and ensuring the safety. (4) The hydrogen flame propagation speed is high, has the risk of tempering under the type of premixing, and this combustor adopts the cooling shell on the one hand, relies on the inside wind and the outside wind cooling of premixing chamber, prevents the too high inside gas spontaneous combustion of premixing chamber temperature, and on the other hand, annular combustion-supporting wind channel interlayer has effectively isolated air intlet and gas spout, even if take place tempering in the premixing chamber, flame does not have the propagation condition and inwards propagates along interlayer air channel always, and the security of combustor has obtained very big improvement.
In conclusion, the invention realizes the safe and stable mixed combustion of the hydrogen-rich waste gas in the pulverized coal boiler by four-stage premixing of the fuel gas and the combustion-supporting air and combining the rotational flow combustion and the blunt body stable combustion, and has no negative influence on the pollutant discharge and the temperature field of the original boiler system. In specific implementation, the invention provides a safe, environment-friendly and efficient way for recycling the hydrogen-rich waste gas, and can create remarkable economic value and social benefit. The premixed hydrogen-rich waste gas blending combustion burner provided by the invention can ensure the safe, stable and efficient operation of a waste gas blending combustion system, and does not generate negative influence on the emission and temperature field of the original boiler system. The burner has the characteristics of high stable combustion, low emission, anti-backfire, no maintenance, suitability for hydrogen-rich fuel and the like.
Claims (10)
1. A premixed hydrogen-rich waste gas blending combustion burner is characterized by comprising a fuel cylinder (1), a combustion-supporting air cylinder (2), a primary premixing swirler (4), a secondary premixing swirler (5), a premixing chamber, a stable combustion bluff body and a cooling shell (8);
the outlet end of the fuel cylinder (1) extends into the combustion-supporting air cylinder (2) and is coaxially installed with the combustion-supporting air cylinder (2), a combustion-supporting air inlet (11) is formed in the upstream position of the outlet end of the fuel cylinder (1) on the combustion-supporting air cylinder (2), the cooling shell (8) is arranged in the combustion-supporting air cylinder (2) and is coaxial with the combustion-supporting air cylinder (2), one end of the cooling shell (8) is connected with the combustion-supporting air cylinder (2), the connection point of the end of the cooling shell (8) and the combustion-supporting air cylinder (2) is located at the downstream of the combustion-supporting air inlet (11), and the other end of the cooling shell (8) extends to the outlet end of the combustion-supporting air cylinder (2); the outlet end of the fuel cylinder (1) extends into the cooling shell (8);
a radial spray gun (1-1) is installed at the outlet end of the fuel cylinder (1), one end of the stable combustion blunt body is connected with the outlet end of the fuel cylinder (1), and the other end of the stable combustion blunt body extends to the end of the combustion-supporting air cylinder (2);
the primary premixing swirler (4) is arranged between the fuel cylinder (1) and the cooling shell (8) and is positioned at the upstream of the radial spray gun (1-1); a premixing chamber and a secondary premixing swirler (5) are sequentially arranged between the fuel cylinder (1) and the cooling shell (8) at the downstream of the radial spray gun (1-1).
2. The premixed hydrogen-rich waste gas blending combustion burner according to claim 1, further comprising an annular combustion-supporting air flow passage interlayer (3), wherein the annular combustion-supporting air flow passage interlayer (3) is arranged between the fuel cylinder (1) and the combustion-supporting air cylinder (2) and is coaxially arranged with the fuel cylinder (1); one end of the annular combustion-supporting air flow channel interlayer (3) is connected with the end part, close to the combustion-supporting air inlet (11), of the cooling shell (8), and the other end of the annular combustion-supporting air flow channel interlayer (3) extends to the upstream of the combustion-supporting air inlet (11); annular channels for combustion-supporting air circulation are formed between the annular combustion-supporting air flow passage interlayer (3) and the combustion-supporting air duct (2) and between the annular combustion-supporting air flow passage interlayer (3) and the fuel cylinder (1).
3. The premixed hydrogen-rich waste gas blending burner according to claim 1, wherein a cooling air chamber capable of being cooled by combustion air entering from a combustion air inlet (11) is arranged in the cooling housing (8), a cooling air inlet (8-1) of the cooling air chamber is positioned at the end of the cooling housing (8) close to one side of the combustion air inlet (11), and a cooling air outlet (8-2) of the cooling air chamber is positioned between the premixing chamber and the secondary premixing cyclone (5) and is capable of blowing air to the inner cavity of the cooling housing (8);
the cooling air inlet (8-1) and the cooling air outlet (8-2) are both circular.
4. A premixed hydrogen-rich waste gas blending burner according to claim 3, wherein the premixing chamber is a venturi premixing chamber (6), and the secondary premixing swirler (5) is disposed at the outlet of the venturi premixing chamber (6).
5. The premixed hydrogen-rich waste gas blending burner as claimed in claim 4, wherein the cooling air outlet (8-2) is located at the inlet of the secondary premixing cyclone (5) and the air outlet direction is perpendicular to the axial direction of the fuel cylinder (1).
6. The premixed hydrogen-rich waste gas blending burner according to claim 3, wherein the portion between the outer side wall of the cooling air chamber and the combustion-supporting air duct (2) is of a cavity structure.
7. The premixed hydrogen-rich waste gas blending burner as claimed in claim 1, wherein the radial spray gun (1-1) is arranged along the radial direction of the fuel cylinder (1), the radial spray gun (1-1) is provided with a plurality of tangential gas nozzles (1-2) along the length direction thereof, and the injection direction of the tangential gas nozzles (1-2) is perpendicular to the axial direction of the fuel cylinder (1).
8. The premixed hydrogen-rich waste gas blending burner according to claim 1 or 7, wherein 6-12 radial spray guns (1-1) are uniformly arranged along the circumferential direction of the fuel cylinder (1), 4-8 tangential gas nozzles (1-2) are arranged on each radial spray gun, and the tangential gas nozzles (1-2) are uniformly arranged along the axial direction of the radial spray gun (1-1);
the primary premixing swirler (4) and the secondary premixing swirler (5) adopt vane type swirlers, the number of the vanes is 8-24, the vanes are uniformly distributed along the circumferential direction, and the outlet swirl angle of the primary premixing swirler (4) is 15-75 degrees; the outlet swirl angle of the secondary premixing swirler (5) is 15-75 degrees.
9. The premixed hydrogen-rich waste gas blending burner according to claim 1, wherein a fire observation mirror (12) and a flame detector interface (13) are arranged on the combustion-supporting air duct (2), and the fire observation mirror (12) and the flame detector interface (13) are arranged at positions opposite to the primary premixed swirler (4) and the secondary premixed swirler (5); the swirl vanes of the primary premix swirler (4) and the secondary premix swirler (5) at the projection positions of the fire observation mirror (12) and the flame detector interface (13) are all subjected to tapping treatment, and the diameter of each tapping is 20-40 mm.
10. The premixed hydrogen-rich waste gas blending burner according to claim 1, wherein the stable combustion bluff body is a hollow stable combustion bluff body (7), the hollow stable combustion bluff body (7) has the same diameter as the fuel cylinder (1), and a spacing layer (14) for isolating the hollow stable combustion bluff body (7) from the inner cavity of the fuel cylinder (1) is arranged between the hollow stable combustion bluff body (7) and the fuel cylinder (1); the outlet of the secondary premixing swirler (5) is flush with the end surface of the hollow stable combustion bluff body (7) to form a throat of the burner together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110858240.5A CN113587087A (en) | 2021-07-28 | 2021-07-28 | Premixing type hydrogen-rich waste gas blending combustion burner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110858240.5A CN113587087A (en) | 2021-07-28 | 2021-07-28 | Premixing type hydrogen-rich waste gas blending combustion burner |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114811581A (en) * | 2022-05-16 | 2022-07-29 | 西安交通大学 | Air-fuel double-grading high-proportion hydrogen-doped ultralow-nitrogen combustor, method and boiler |
| CN116241887A (en) * | 2023-03-24 | 2023-06-09 | 南京工程学院 | Shaftless hydrogen-rich gas burner |
| CN116398880A (en) * | 2023-04-27 | 2023-07-07 | 哈尔滨工业大学 | Micro-scale pure hydrogen fuel premixing burner |
| CN116398880B (en) * | 2023-04-27 | 2024-04-19 | 哈尔滨工业大学 | Micro-scale pure hydrogen fuel premixing burner |
-
2021
- 2021-07-28 CN CN202110858240.5A patent/CN113587087A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114811581A (en) * | 2022-05-16 | 2022-07-29 | 西安交通大学 | Air-fuel double-grading high-proportion hydrogen-doped ultralow-nitrogen combustor, method and boiler |
| CN114811581B (en) * | 2022-05-16 | 2023-09-22 | 西安交通大学 | Air-fuel dual-stage high-proportion hydrogen-doped ultralow-nitrogen combustor, method and boiler |
| CN116241887A (en) * | 2023-03-24 | 2023-06-09 | 南京工程学院 | Shaftless hydrogen-rich gas burner |
| CN116241887B (en) * | 2023-03-24 | 2023-10-27 | 南京工程学院 | Shaftless hydrogen-rich gas burner |
| CN116398880A (en) * | 2023-04-27 | 2023-07-07 | 哈尔滨工业大学 | Micro-scale pure hydrogen fuel premixing burner |
| CN116398880B (en) * | 2023-04-27 | 2024-04-19 | 哈尔滨工业大学 | Micro-scale pure hydrogen fuel premixing burner |
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