CN209960475U - Combined combustion device for burning semicoke - Google Patents
Combined combustion device for burning semicoke Download PDFInfo
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- CN209960475U CN209960475U CN201920281498.1U CN201920281498U CN209960475U CN 209960475 U CN209960475 U CN 209960475U CN 201920281498 U CN201920281498 U CN 201920281498U CN 209960475 U CN209960475 U CN 209960475U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a combined burning device for burning semicoke. This combined combustion apparatus includes: the burner comprises a combustion chamber, a flameless burner, a powder feeding device, a gas pipeline, a primary air path, a secondary air path, an air supply air path and a flue gas pipeline. The utility model discloses can realize the high-efficient low utilization that pollutes of semicoke, through the combination combustion mode, carry out the mixing burning of semicoke and buggy, improve volatilizing and the characteristic of catching fire of semicoke, promote the burn-off of semicoke, realize even combustion chamber temperature and lower nitrogen oxide original emission to reach the high-efficient clean extensive combustion utilization of semicoke.
Description
Technical Field
The utility model relates to a semicoke burning technical field, concretely relates to use combination formula burner of semicoke.
Background
Energy chemical utilization schemes developed based on coal gasification, hydro-gasification and coal pyrolysis technologies are becoming important development directions for developing and utilizing coal efficiently, cleanly and economically. Coal gasification processes, however, produce large amounts of ultra-low volatile matter (less than 4%) char. The semi-coke has high ignition temperature, slow combustion reaction rate and long burnout time, and is not suitable to be used as an industrial raw material any more. Burning the semicoke is an important technical means for large-scale utilization of the semicoke. In the conventional combustion mode, the semicoke has: (1) difficulty in ignition; (2) the burnout rate is low; (3) the pollution discharge amount is high. Adopt conventional combustion method, because traditional burning preheats the effect poor, have obvious high-temperature region (lead to the pollutant to generate highly), the semicoke dwell time is short in the furnace moreover, is unfavorable for the high-efficient burning utilization of semicoke.
The chinese patent application No. 201010034027.4 proposes an oxygen-enriched combustion device for burning low-grade coal, which adopts an oxygen-enriched combustion mode to solve the problems of ignition and stable combustion of the low-grade coal, but increases the combustion temperature of flame and simultaneously causes the emission of a large amount of pollutants. The Chinese patent application with the application number of 201410252555.5 provides a combustion device for gasifying semicoke type nonflammable fine particle fuel and a combustion method using the same, which adopts a combustion mode of a circulating fluidized bed and adopts a material returning inclined tube to improve the retention time of semicoke in the fluidized bed, has the advantages of high burnout degree and less pollution, but can not overcome the problems of low combustion strength and difficult ignition of semicoke due to low combustion temperature. U.S. Pat. No. US2014250887-A1 proposes a "Power Generation System Using Low rank coal" to upgrade the low rank coal by preheating to a coal reactant more reactive than the low rank coal, but the system requires a CO reaction2The collected power plants are combined and coupled to operate, so that certain limitation is caused, and how to upgrade and utilize the semicoke with extremely low volatile matter content is not explained. Japanese patent No. JP2014018726-A proposes a power plant for thermal power generation by chemical looping combustion of low-rank coal, which utilizes the low-rank coal by means of chemical looping combustion and enriches CO in the low-rank coal2However, the system is still designed for chemical looping combustion of coal and cannot be designed for ultra-lowAnd (4) efficiently burning and utilizing the volatile semicoke.
In general, a large amount of ultra-low volatile content semicoke produced in a coal gasification process is currently difficult to utilize as an industrial feedstock on a large scale. The traditional combustion mode is used for burning and utilizing the semicoke, and has the obvious problems of difficult ignition, difficult complete combustion, high pollutant emission and the like. In order to realize large-scale efficient low-pollution utilization of the semicoke, a novel combustion technology is needed to overcome the defects of difficult ignition, low burnout degree, high pollutant emission and the like of the semicoke.
SUMMERY OF THE UTILITY MODEL
To the problem, the utility model provides a combination formula burner who uses semicoke can realize the high-efficient low utilization that pollutes of semicoke. The utility model discloses a combination combustion mode carries out the mixing burning of semicoke and buggy, improves the characteristics of volatilizing and catching fire of semicoke, promotes the burn-off of semicoke, realizes even combustion chamber temperature and the original emission of lower nitrogen oxide to reach the clean extensive burning utilization of semicoke high efficiency.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an aspect of the utility model provides a fire combination formula burner of using semicoke, include: the device comprises a combustion chamber, a flameless combustor, a powder feeding device, a gas pipeline, a primary air path, a secondary air path, an air supply air path and a flue gas pipeline;
the flameless combustor is installed and connected to the top of the combustion chamber and comprises a swirl nozzle and a straight-flow nozzle;
the powder feeding device, the gas pipeline, the primary air path and the secondary air path are all connected to the flameless combustor to respectively convey a mixture of semicoke and coal powder, gas, primary air and secondary air into the combustion chamber so as to carry out flameless combustion;
the side wall of the air supply air path connected to the combustion chamber supplies air for the downstream conveying in the combustion chamber to support combustion;
the bottom of the combustion chamber comprises a smoke outlet; the flue gas pipeline with the exhaust port is connected to the flue gas in the output combustion chamber, and will the flue gas divide into three branch road: a smoke circulation primary air path, a smoke circulation air supplement air path and a smoke exhaust air path; the smoke circulation primary air path is connected to the primary air path, the smoke circulation air supplement air path is connected to the air supplement air path, and the smoke exhaust air path is located behind the smoke circulation primary air path and the smoke circulation air supplement air path and used for treating and discharging residual smoke.
Preferably, the primary air path, the secondary air path and the air supply path each comprise a blower for delivering primary air, secondary air and air supply into the combustion chamber;
the primary air and the air supplement are mixed gas of oxidant gas and flue gas, and the secondary air is oxidant gas.
Preferably, the oxidant gas is air, oxygen or oxygenated air.
Preferably, the flameless burner comprises a swozzle and a straight-flow nozzle;
wherein the swozzle comprises a fuel nozzle and an oxidant nozzle;
the fuel spray pipe is in an F-shaped pipe shape, two bent parts are respectively connected with two branch pipes as a fuel gas inlet and a fuel inlet, and a flame stabilizing disc is arranged at an outlet; the gas inlet is connected with a gas pipeline, and the primary air carries a mixture of semicoke and pulverized coal to enter the fuel spray pipe from the fuel inlet;
the oxidant nozzle is sleeved on the periphery of the fuel nozzle, a circular seam between the oxidant nozzle and the fuel nozzle is used as a channel of the oxidant, and a guide vane is arranged in the channel; the oxidant spray pipe is an L-shaped pipe, and the bent part is connected with a branch pipe as an oxidant inlet;
a through hole corresponding to the outlet of the fuel spray pipe is formed in the center of the flame stabilizing disc, the flame stabilizing disc is circular, and the diameter D of the flame stabilizing disc is smaller than the pipe inner diameter D1 of the oxidant spray pipe; the direct current nozzles are annularly and uniformly distributed around the swirl nozzle;
the secondary air path is switchably connected to the oxidant inlet and the straight-flow nozzle.
Preferably, the direct-current nozzle is a straight pipe and has a tapered structure, one side with a large pipe diameter is an inlet, and the other side is an outlet; the secondary air enters from the inlet and is sprayed into the combustion chamber from the outlet.
Preferably, the flameless burner further comprises a metal plate; the swirl nozzle and the direct current nozzle are fixed into a whole through a metal plate and are installed and connected to the top of the combustion chamber through the metal plate.
Preferably, the pipe inner diameter d1 of the oxidant spray pipe is 1.2-5 times of the pipe inner diameter d2 of the fuel spray pipe, and the wall thickness of the oxidant spray pipe and the fuel spray pipe is 1-2 mm.
Preferably, the flame stabilizing disc is made of stainless steel or other metal materials capable of resisting the high temperature of 1300 ℃, the flame stabilizing disc mainly plays a role in stabilizing flame, assisting in preheating and reducing gas resistance, and the diameter D of the flame stabilizing disc is 2-5 mm smaller than the inner diameter D1 of the oxidant spray pipe.
Preferably, the pipe inner diameter d3 of the direct-flow nozzle is 0.1-0.4 times of the pipe inner diameter d1 of the oxidant spray pipe, so that fast high-speed jet flows are obtained and are uniformly distributed around the swirl nozzle in an annular mode, and the number of the jet flows is not less than 2.
Preferably, the exhaust smoke wind path comprises a boiler water film dust collector, a flue gas condenser, an induced draft fan and a smoke exhaust port which are arranged in sequence.
Preferably, the gas pipeline comprises a gas bottle and a flow meter, and the gas is controlled to enter the flameless combustor through the flow meter; the fuel gas is methane or hydrogen.
Preferably, the secondary air path further includes an electric heater downstream of the blower to preheat the secondary air. The downstream refers to an air path in the blowing direction of the blower.
Preferably, the combined combustion device for burning semicoke further comprises an oxidant gas supply device;
the oxidant gas supply device is respectively connected to the primary air path, the secondary air path and the air supply air path.
Preferably, the oxidizer gas supply device is an air pump; the oxidant gas in this case is air.
Preferably, each pipeline of the combined combustion device for burning the semi-coke comprises a valve for control.
Preferably, the combustion chamber is cuboid, cylinder and other shapes, and radial height sets up 3 ~ 4 times into horizontal width to improve fuel at the dwell time of combustion chamber, improve the burnout rate.
Preferably, the air supply air path comprises an air supply nozzle, and the air supply nozzle is installed and connected at the height of 1/3-1/2 from bottom to top on the side wall of the combustion chamber.
Preferably, the air supply nozzle is a straight pipe and has a tapered structure, one side with a large pipe diameter is an air supply inlet, and the other side is connected to the combustion chamber.
Preferably, the air supply path comprises a plurality of air supply nozzles which are uniformly arranged and connected on the peripheral side wall of the combustion chamber.
Preferably, one gas injection nozzle is arranged on each side wall of the combustion chamber, and the pipe inner diameter d4 is the same as the pipe inner diameter d3 of the straight-flow nozzle in the horizontal direction of the side wall.
In a preferred embodiment of the present invention: one side of the gas pipeline is connected with a gas cylinder and controls the flow through a flowmeter, and the other side of the gas pipeline is connected with a gas inlet of a fuel spray pipe of the swirl nozzle of the flameless burner. One side of the primary air path is connected with an oxidant gas supply device and a smoke circulation primary air path, a valve is arranged to control the total flow, the oxidant gas and the circulation smoke are mixed by a blower to be used as primary air, and the other side of the primary air path is connected with a powder supply device which carries a semicoke and coal powder mixing mixture through the primary air and is connected with a fuel inlet of a fuel spray pipe of a swirl nozzle of the flameless burner. And a high-pressure fan is arranged on the secondary air path to improve the flow velocity of an oxidant, and two branches are divided to be respectively connected with an oxidant inlet of an oxidant spray pipe of the swirl nozzle of the flameless combustor and an inlet of a direct-flow nozzle of the flameless combustor and are provided with valves for control. One side of the air supply air path is connected with the oxidant gas supply device and the flue gas circulation air supply air path, a valve is arranged to control the total flow, the oxidant gas and the circulation flue gas are mixed through a fan to serve as air supply, and the other side of the air supply air path is connected to the air supply nozzle.
The utility model discloses another aspect still provides a combustion method who uses above burner, includes following step:
1) the semicoke and the coal powder are uniformly mixed according to a certain proportion.
2) The fuel gas is fed into the combustion chamber through the swirl nozzle, and secondary air is injected into the combustion chamber through the swirl nozzle (in this case, swirl secondary air), so that the fuel gas is combusted and preheats the combustion chamber.
3) After preheating is finished, fuel switching (switching from gas to a mixture of semicoke and coal powder) is started, the mixture of semicoke and coal powder is carried by primary air and enters a combustion chamber from a swirl nozzle, the air inflow of the gas is gradually reduced, the powder feeding amount of the mixture of semicoke and coal powder is gradually increased, and finally the gas inflow of the gas is completely cut off.
In the process, the primary air carrying the mixture of the semicoke and the coal powder is sprayed into the combustion chamber to start ignition and combustion, the secondary air speed is kept unchanged, and the stable swirl combustion is waited.
4) After the swirl combustion is stable, switching the secondary air to be sprayed into the combustion chamber from the direct-current nozzle to form a distributed jet combustion mode (at the moment, the secondary air is called as flameless secondary air); due to the strong entrainment effect of the high-speed jet flow, a large amount of flue gas is entrained to form a low-oxygen atmosphere, the flameless combustion working condition is achieved, and stable semi-coke blending flameless combustion is realized.
5) And opening the air supply air path and the flue gas circulation air path, circulating one part of flue gas to be mixed with oxidant gas to serve as air supplement, introducing the air supplement into the downstream of the combustion chamber to perform afterburning so as to improve the burnout degree, and circulating the other part of flue gas to be mixed with the oxidant gas to serve as primary air to improve the temperature of the primary air and reduce the oxygen concentration.
Preferably, the blending ratio of the semi-coke and the coal powder is 40-60%.
Preferably, the secondary air is preheated to 250-350 ℃ in the secondary air passage. The equivalence ratio of the fuel to the oxidant is 0.7-0.9, and the emission of nitrogen oxides can be reduced. The fuel gas is selected from high calorific value fuel gas such as methane, hydrogen and the like, and the hearth is preheated.
In a preferred embodiment of the present invention, the combustion method comprises the following steps:
1) the semicoke and the coal powder are uniformly mixed according to a certain proportion.
2) And (3) feeding the fuel gas into the combustion chamber from a fuel gas inlet of the fuel spray pipe of the swirl nozzle, opening a fan and a valve on a secondary air path, spraying secondary air into the combustion chamber from an oxidant spray pipe (called swirl secondary air at this time) of the swirl nozzle, and combusting the fuel gas and preheating the combustion chamber.
3) After preheating is finished, fuel switching (switching from gas to a mixture of semicoke and pulverized coal) is started, a fan and a valve on a primary air path are opened to introduce primary air, the air inflow of the gas is gradually reduced, the powder feeding amount of the mixture of the semicoke and the pulverized coal is gradually increased, and finally the gas inflow of the gas is completely cut off; in the process, the primary air carrying the mixture of the semicoke and the pulverized coal is sprayed into the combustion chamber through the fuel spray pipe of the swirl nozzle to start ignition and combustion, the secondary air speed is kept unchanged, and the stabilization of swirl combustion is waited.
4) And after the swirl combustion is stable, the swirl secondary air is closed, so that the secondary air is introduced from the direct-current nozzle (at this time, called as flameless secondary air) and is vertically sprayed into the combustion chamber to form a distributed jet combustion mode. Due to the strong entrainment effect of the high-speed jet flow, a large amount of flue gas is entrained to form a low-oxygen atmosphere, the flameless combustion working condition is achieved, and stable semi-coke blending flameless combustion is realized.
5) And opening fans and valves on the air supply air path and the flue gas circulation air path, circulating one part of flue gas to be mixed with the oxidant to be used as air supplement, introducing the air supplement into the downstream of the combustion chamber to perform afterburning so as to improve the burnout degree, and circulating the other part of flue gas to be mixed with the oxidant to be used as primary air to improve the temperature of the primary air and reduce the oxygen concentration.
The utility model adopts the technical scheme, has following advantage:
(1) the semicoke and the coal powder are mixed, so that the semicoke which is difficult to ignite can be ignited along with the rapid ignition and combustion of the coal powder, and the ignition difficulty is reduced.
(2) During flameless combustion, the strong entrainment effect of the high-temperature flue gas can strongly preheat the semicoke blended fuel, enhance the temperature rise of the semicoke, reduce the ignition delay of the semicoke, improve the ignition characteristic of the semicoke, and discover through experiments and numerical studies that the semicoke is rapidly heated by easily ignited coal powder after entering a combustion chamber, and the ignition delay time of the semicoke is similar to that of the coal powder.
(3) The strong entrainment effect of the high-speed jet flow forms a stable large-scale backflow zone, the retention time of the semicoke in the hearth can be prolonged, so that the burnout degree is improved, experiments and numerical simulation researches find that when the blending proportion of the semicoke with 4% of volatile matter is less than or equal to 30%, the total fuel burnout rate is higher than 90%, and the semicoke blending proportion is 40%, and the total burnout rate is about 88%.
(4) The flameless combustion has NO local high-temperature area, can inhibit the generation of thermal and fuel nitrogen oxides, and experiments and numerical simulation researches find that the original NO emission of the typical blended combustion of the semicoke and the coal powder (the mass fraction of N element is 1.5%) is always lower than 100 ppm.
(5) The flue gas of the external circulation is mixed with air and then sprayed into the downstream of the combustion chamber for combustion supporting, so that the burnout degree of the semicoke can be further improved, researches show that the burnout rate can be further improved to more than 95%, the flue gas external circulation can further reduce the generation of nitrogen oxides, and researches show that the flue gas external circulation can further reduce NO emission by more than 60%.
Drawings
Fig. 1 is a schematic view of a semicoke-burning combined combustion apparatus according to a preferred embodiment of the present invention.
Fig. 2 is a cross-sectional view of a flameless burner in a preferred embodiment of the present invention.
Fig. 3 is a view from direction a in fig. 2.
Fig. 4 is a cross-sectional view of a combustion chamber in a preferred embodiment of the invention.
Fig. 5 is a view from direction B of fig. 4.
Description of reference numerals:
1-powder feeding device, 2-flowmeter, 3-methane gas bottle, 4-combustion chamber, 5-primary air blower, 6-electric heater, 7-secondary air blower, 8-supplementary air blower, 9-boiler water film dust remover, 10-flue gas condenser, 11-induced draft fan, 12-smoke outlet, 13-powder feeding pipeline, 14-methane pipeline, 15-primary air path, 16-air pump, 17-flue gas circulation primary air path, 18-flameless combustion secondary air path, 19-cyclone secondary air path, 20-supplementary air path, 21-flue gas circulation supplementary air path and 22-flue gas outlet.
24-fuel spray pipe, 241-fuel inlet, 242-fuel gas inlet, 26-flame stabilizing disc, 27-oxidant spray pipe, 271-oxidant inlet, 28-direct-flow nozzle, 281-direct-flow nozzle inlet, 29-guide vane and 40-metal plate.
30-hearth, 31-flameless burner, 32-air supply nozzle and 22-smoke outlet.
Detailed Description
In order to illustrate the invention more clearly, the invention is further described below with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The utility model provides a preferred embodiment, as shown in fig. 1, this use combination formula burner of semicoke includes combustion chamber 4, gives powder pipeline 13, methane pipeline 14, primary air path 15, secondary air path, tonifying qi wind path 20 and flue gas circulation system.
And a swirl nozzle and a direct current nozzle annularly distributed around the swirl nozzle are arranged above the body of the combustion chamber 4. The swirl nozzle is connected with a powder feeding pipeline 13, a methane pipeline 14 (methane can be replaced by combustible gas such as hydrogen), a primary air path 15 and a swirl secondary air path 19. The dc nozzle is connected to a flameless secondary air passage 18. A flue gas outlet 22 is provided below the combustion chamber 4.
The powder feeding pipeline 13 conveys the semi-coke coal powder mixture into the combustion chamber 4 through the powder feeding device 1.
The methane pipeline 14 comprises a flow meter 2 and a methane gas cylinder 3, and the flow of the methane gas cylinder 3 is regulated by the flow meter 2, and fuel gas is supplied to the combustion chamber through the methane pipeline 14.
The primary air duct 15 is provided with a primary air blower 5 and connected to a flue gas circulation primary air duct 17. The primary air blower 5 extracts cold air with the temperature of 20-40 ℃ and the flue gas passing through the flue gas circulation primary air passage 17 to be mixed to be used as primary air, and the mixture carrying the semi-coke coal powder enters the hearth from the swirl nozzle.
The secondary air duct is provided with a secondary air blower 7 and an electric heater 6. The secondary air blower 7 preheats cold air at 20-40 ℃ through the electric heater 6 and sends the air into the combustion chamber as secondary air. The secondary air enters the combustion chamber and is switched by two branches, and can enter through an oxidant inlet of a swirl nozzle (namely a swirl secondary air path 19) or can be subjected to high-speed jet flow in a furnace through a direct-current nozzle (namely a flameless combustion secondary air path 18), wherein the jet flow speed is 50-150 m/s.
The air supply passage 20 is provided with an air supply fan 8 and is connected with a flue gas circulation air supply passage 21. The air supply fan 8 extracts cold air with the temperature of 20-40 ℃ and the flue gas passing through the flue gas circulation air supply air path 21 to be mixed and then used as air supply to be sent to the downstream of the combustion chamber for combustion supporting.
The air pump 16 is connected to the primary air path 15, the secondary air path and the air supply path 20, respectively, for supplying cold air as the oxidant gas.
The flue gas pipeline comprises a flue gas circulation primary air path 17, a flue gas circulation air supply air path 21 and a flue gas exhaust air path. The flue gas generated by combustion in the combustion chamber 4 is divided into three streams of air flows for treatment through a flue gas outlet 22 at the outlet of the hearth, and a part of the flue gas passes through a flue gas circulation primary air path 17 and then is mixed with air to be used as primary air carrying fuel; part of the flue gas passes through a flue gas circulation air supplement path 21, is mixed with air and then is introduced into the downstream of the combustion chamber as air supplement to support combustion; the rest flue gas is processed by the action of the induced draft fan 11 sequentially through the boiler water dust scrubber 9 and the flue gas condenser 10 and then is discharged from the smoke outlet 12.
Fig. 2 and 3 are structural views of a flameless burner. The fuel nozzle comprises a swirl nozzle and a straight-flow nozzle 28, wherein a fuel spray pipe 24 of the swirl nozzle is shaped like an F-shaped pipe, and two bent parts are respectively connected with two branch pipes as a fuel inlet 241 and a fuel gas inlet 242. The oxidant nozzle 27 is an L-shaped pipe, the bent part is connected with a branch pipe as an oxidant inlet 271, the oxidant nozzle 27 is embedded on the fuel nozzle, the annular seam between the oxidant nozzle and the fuel nozzle is used as a channel of the oxidant, and a guide vane 29 is arranged in the channel to form rotational flow. The flame stabilizing disc 26 is installed at the outlet of the fuel nozzle 24, as shown in fig. 3, a through hole corresponding to the outlet of the fuel nozzle 24 is provided at the center of the flame stabilizing disc 26, the outer contour of the flame stabilizing disc 26 is circular, and the diameter D of the flame stabilizing disc is smaller than the pipe inner diameter D1 of the oxidant nozzle 27. The flame holding disk 26 is seen in plan view as a ring with radial openings arranged around the circumference of the ring, and the oxidant gas is injected into the combustion chamber through these radial openings and the gaps between the flame holding disk and the wall of the oxidant lance 27. The radial openings in fig. 3 are six uniformly distributed elongated openings.
Four direct-current nozzles 28 are uniformly distributed around the swirl nozzle in an annular manner; the dc nozzle 28 is a straight tube with a tapered structure, and has a dc nozzle inlet 281 on the side with a larger tube diameter and an outlet on the other side. The secondary air path is switchably connected to the oxidant inlet 271 and the dc nozzle inlet 281.
The flameless burner further comprises a metal plate 40; the swirler and the swirler 29 are integrally fixed by a metal plate 40, and are attached to the top of the combustion chamber by the metal plate 40.
Fig. 4 and 5 are schematic structural views of a combustion chamber according to an embodiment of the present invention. The flameless burner 31 is arranged at the center above the combustion chamber, the density of high-temperature flue gas in the furnace is smaller, so that the high-temperature flue gas flows upwards to form natural flue gas circulation, the air supply nozzles 32 are arranged at the position of one third of the height of the peripheral side wall of the combustion chamber from bottom to top, and the flue gas outlet 22 is arranged below the combustion chamber.
The semicoke blending combustion process of the embodiment is as follows:
(1) and the gas circuit is checked to ensure the smoothness of the gas circuit.
(2) And after the inspection is finished, opening the primary fan, the secondary fan and the secondary wind power heater, and adjusting to the required temperature of 250-350 ℃.
(3) When there is no problem with the gas intake, the methane cylinder is opened and the gas is ready for supply.
(4) And adjusting the rotation speed of the secondary fan to adjust the flow of the secondary air to the air amount when the equivalence ratio of the secondary air to the fuel is 1.
(5) And regulating the fuel mass flow meter to open the methane supply and perform ignition.
(6) After ignition is successful, the temperature of methane is kept for supplying, the furnace is dried to preheat the hearth, the gas flow is properly adjusted according to the heating rate, and the hearth is heated to 800-900 ℃.
(7) The methane inlet pipeline is cut off, and primary air is introduced. The primary air is air and is cold air. And (3) opening the powder feeder, spraying the mixture of the semicoke and the pulverized coal into a hearth from a fuel inlet to ignite and burn under the carrying of primary air, and realizing stable rotational flow combustion.
(8) After the combustion is stable, the secondary air is switched to the direct current nozzles on the two sides for air inlet, a distributed jet combustion mode is formed, the flow of the secondary air is the air amount when the equivalent ratio of the secondary air to the fuel is 0.8, the secondary air can be finely adjusted, and at the moment, the interior of the hearth presents a flameless combustion mode without bright flame.
The embodiment can realize efficient and low-pollution combustion of blended semicoke, the semicoke burnout degree can reach more than 90% under the condition of blending rate lower than 40%, and the emission of nitrogen oxides can be lower than 100ppm (3% O)2Data at concentration). The result of the embodiment can show that the utility model discloses can realize that the extensive high-efficient low pollution of semicoke utilizes.
It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and the structure, arrangement, and connection of the components may be changed. On the basis of the technical scheme of the utility model, the all sides are according to the utility model discloses the principle is to the improvement of individual part or be equal to the transform, all should not exclude the utility model discloses an outside the protection scope.
Claims (10)
1. A combined combustion device for burning semicoke, comprising: the device comprises a combustion chamber, a flameless combustor, a powder feeding device, a gas pipeline, a primary air path, a secondary air path, an air supply air path and a flue gas pipeline;
the flameless combustor is installed and connected to the top of the combustion chamber and comprises a swirl nozzle and a straight-flow nozzle;
the powder feeding device, the gas pipeline, the primary air path and the secondary air path are all connected to the flameless combustor to respectively convey a mixture of semicoke and coal powder, gas, primary air and secondary air into the combustion chamber so as to carry out flameless combustion;
the side wall of the air supply air path connected to the combustion chamber supplies air for the downstream conveying in the combustion chamber to support combustion;
the bottom of the combustion chamber comprises a smoke outlet; the flue gas pipeline with the exhaust port is connected to the flue gas in the output combustion chamber, and will the flue gas divide into three branch road: a smoke circulation primary air path, a smoke circulation air supplement air path and a smoke exhaust air path; the smoke circulation primary air path is connected to the primary air path, the smoke circulation air supplement air path is connected to the air supplement air path, and the smoke exhaust air path is located behind the smoke circulation primary air path and the smoke circulation air supplement air path and used for treating and discharging residual smoke.
2. The combined combustion device of claim 1, wherein the primary air path, the secondary air path, and the make-up air path each include a blower for delivering the primary air, the secondary air, and the make-up air into the combustion chamber;
the primary air and the air supplement are mixed gas of oxidant gas and flue gas, and the secondary air is oxidant gas;
the oxidant gas is air, oxygen or oxygenated air.
3. The combined combustion device of claim 1, wherein the flameless combustor comprises a swozzle and a straight-through nozzle;
wherein the swozzle comprises a fuel nozzle and an oxidant nozzle;
the fuel spray pipe is in an F-shaped pipe shape, two bent parts are respectively connected with two branch pipes as a fuel gas inlet and a fuel inlet, and a flame stabilizing disc is arranged at an outlet; the gas inlet is connected with a gas pipeline, and the primary air carries a mixture of semicoke and pulverized coal to enter the fuel spray pipe from the fuel inlet;
the oxidant nozzle is sleeved on the periphery of the fuel nozzle, a circular seam between the oxidant nozzle and the fuel nozzle is used as a channel of the oxidant, and a guide vane is arranged in the channel; the oxidant spray pipe is an L-shaped pipe, and the bent part is connected with a branch pipe as an oxidant inlet;
a through hole corresponding to the outlet of the fuel spray pipe is formed in the center of the flame stabilizing disc, the flame stabilizing disc is circular, and the diameter D of the flame stabilizing disc is smaller than the pipe inner diameter D1 of the oxidant spray pipe;
the direct current nozzles are annularly and uniformly distributed around the swirl nozzle;
the secondary air path is switchably connected to the oxidant inlet and the straight-flow nozzle.
4. The combined combustion device as claimed in claim 3, wherein the straight nozzle is a straight tube with a tapered structure, and the side with a large tube diameter is an inlet and the other side is an outlet; the secondary air enters from the inlet and is sprayed into the combustion chamber from the outlet;
the pipe inner diameter d1 of the oxidant spray pipe is 1.2-5 times of the pipe inner diameter d2 of the fuel spray pipe;
the pipe inner diameter d3 of the direct current nozzle is 0.1-0.4 times of the pipe inner diameter d1 of the oxidizing agent spray pipe.
5. The combined combustion device according to claim 1, wherein the smoke exhaust air path comprises a boiler water film dust collector, a smoke condenser, an induced draft fan and a smoke exhaust port which are arranged in sequence.
6. The combined combustion device of claim 1, wherein the gas conduit includes a gas bottle and a flow meter through which the gas is controlled into the flameless combustor; the fuel gas is methane or hydrogen.
7. The combined combustion device of claim 1, wherein the secondary air path further comprises an electric heater downstream of the blower to preheat the secondary air.
8. The combined combustion apparatus of claim 1, wherein the combined semicoke-burning combustion apparatus further comprises an oxidant gas supply means;
the oxidant gas supply device is respectively connected to the primary air path, the secondary air path and the air supply air path.
9. The combined combustion device of claim 1, wherein valves are included in each line of the combined combustion device for burning carbocoal.
10. The combined combustion device as claimed in claim 1, wherein the air supply passage comprises an air supply nozzle, and the air supply nozzle is installed and connected at the height of 1/3-1/2 from bottom to top of the side wall of the combustion chamber;
the air supply air path comprises a plurality of air supply nozzles which are uniformly installed and connected on the peripheral side wall of the combustion chamber.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109812804A (en) * | 2019-03-06 | 2019-05-28 | 华中科技大学 | A kind of combined combustion device using semicoke and combustion method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109812804A (en) * | 2019-03-06 | 2019-05-28 | 华中科技大学 | A kind of combined combustion device using semicoke and combustion method |
| CN109812804B (en) * | 2019-03-06 | 2024-01-26 | 华中科技大学 | Combined combustion device and combustion method for burning semicoke |
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