CN214809742U - Biomass pyrolysis reburning collaborative SNCR denitration system - Google Patents
Biomass pyrolysis reburning collaborative SNCR denitration system Download PDFInfo
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Abstract
The utility model relates to a biomass pyrolysis reburning synergetic SNCR denitration system, which comprises a biomass pyrolysis system, an amino reducing agent supply system and a two-stage SNCR denitration device, wherein the biomass pyrolysis system, the amino reducing agent supply system and the two-stage SNCR denitration device are connected to a boiler; the two-stage SNCR denitration device comprises a first-stage SNCR denitration reactor and a second-stage SNCR denitration reactor; the boiler is sequentially provided with a low-nitrogen burner positioned in a main combustion area, a biomass pyrolysis gas nozzle positioned in a reburning area, a SOFA air nozzle positioned in a burnout area and a first-stage SNCR denitration reactor from bottom to top; a screen type superheater, a second-stage SNCR denitration reactor and a high-temperature superheater are sequentially arranged at the horizontal flue of the hearth; a solid phase outlet of the biomass pyrolysis system is connected with the low-nitrogen burner, and a gas phase outlet is connected with a biomass pyrolysis gas nozzle; and the output end of the amino reducing agent supply system is respectively connected with the amino reducing agent spray gun of the first-stage SNCR denitration reactor and the second-stage SNCR denitration reactor. The utility model relates to a rationally, simple high-efficient, it is stable feasible.
Description
Technical Field
The utility model relates to a flue gas denitration technique of thermal power plant specifically is a living beings pyrolysis reburning is SNCR deNOx systems in coordination.
Background
Nitrogen oxides are one of the main air pollution sources of coal-fired power plants, and the large amount of emission of the nitrogen oxides can cause environmental problems such as acid rain, photochemical smog and the like. At present, nitrogen oxide emission reduction technologies commonly used in coal-fired power plants include low air staged combustion, partial reburning, non-selective catalytic reduction (SNCR), Selective Catalytic Reduction (SCR), and the like. The combination or combination of different denitration technologies is an important development direction of the denitration technology, and the development direction is developed by innovating a denitration mechanism and researching and developing a multi-stage composite denitration technology.
The local reburning is one of effective measures for reducing NOx emission of the coal-fired boiler, and the technology mainly divides the combustion process in the boiler into 3 combustion zones along the height of a hearth: the main combustion zone, the reburning zone and the burnout zone utilize the reducing atmosphere formed by fuel classification to force the NOx formed in the main combustion zone to be reduced into N in the reburning zone2And other nitrogen-containing molecules, and finally replenishing part of the air in the burnout zone to oxidize the remaining combustible materials. The biomass is a special fuel with extremely high volatile components, and when the temperature is 700-2、CHiAnd the combustible gases such as CO are taken as reburning fuel and are sprayed into the hearth from the reburning area, so that NOx in the flue gas can be effectively reduced. In addition, biomass combustion can provide heat, so that the use amount of coal is reduced, and further CO is reduced2Discharge amount, so that biomass reburning is oneA clean and efficient denitration method.
The SNCR flue gas denitration technology is characterized in that amino reducing agent is sprayed to reduce NO into N under the aerobic condition in the temperature range of 850-2And H2O, research shows that the proper addition of CHi, CO and H2And the mixed gas can improve the denitration efficiency of the SNCR reaction under the low-temperature condition.
The high-temperature pyrolysis of biomass can produce CHi and H2Reducing gas such as CO and coke often reduce the interior nitrogen oxide of stove through living beings reburning among the prior art, but do not carry out classification processing in getting into the inside different regions of furnace with mixed flue gas to the pyrolysis charcoal that produces among the biomass pyrolysis process to lead to still having the lower problem of denitration efficiency inside the furnace.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a living beings pyrolysis reburning is SNCR deNOx systems in coordination, reasonable in design, simple high-efficient, it is stable feasible.
The utility model discloses a realize through following technical scheme:
a biomass pyrolysis and reburning cooperative SNCR denitration system comprises a biomass pyrolysis system, an amino reducing agent supply system and a two-stage SNCR denitration device, wherein the biomass pyrolysis system, the amino reducing agent supply system and the two-stage SNCR denitration device are connected to a boiler;
the two-stage SNCR denitration device comprises a first-stage SNCR denitration reactor and a second-stage SNCR denitration reactor;
the boiler is sequentially provided with a low-nitrogen burner positioned in a main combustion area, a biomass pyrolysis gas nozzle positioned in a reburning area, a SOFA air nozzle positioned in a burnout area and a first-stage SNCR denitration reactor from bottom to top; a screen type superheater, a second-stage SNCR denitration reactor and a high-temperature superheater are sequentially arranged at the horizontal flue of the hearth;
a solid phase outlet of the biomass pyrolysis system is connected with the low-nitrogen burner, and a gas phase outlet is connected with a biomass pyrolysis gas nozzle;
and the output end of the amino reducing agent supply system is respectively connected with the amino reducing agent spray gun of the first-stage SNCR denitration reactor and the second-stage SNCR denitration reactor.
Furthermore, the biomass pyrolysis system comprises a ball mill, a biomass particle feeding hopper arranged at a feeding port of the ball mill, a cyclone separator connected with an outlet of the ball mill, and a pyrolysis gas spray gun arranged on a gas phase outlet pipeline of the cyclone separator;
and a gas-phase outlet of the cyclone separator is connected with a biomass pyrolysis gas nozzle, and a solid-phase outlet of the cyclone separator is connected with a low-nitrogen combustor.
Furthermore, the cyclone separator comprises a first-stage cyclone separator and a second-stage cyclone separator; the inlet of the first-stage cyclone separator is connected with the outlet of the ball mill, the pyrolytic carbon outlet is connected with the low-nitrogen burner, and the gas-phase outlet is connected with the inlet of the second-stage cyclone separator; the pyrolytic carbon outlet of the second-stage separator is connected with the low-nitrogen combustor, and the gas-phase outlet is connected with the biomass pyrolysis gas nozzle; and the pyrolytic carbon outlets of the first-stage cyclone separator and the second cyclone separator are respectively connected with a nitrogen conveying pipeline.
Furthermore, a high-temperature flue gas extraction pipeline communicated with a horizontal flue in front of the high-temperature superheater is arranged on the ball mill; and a hand valve is arranged between the ball mill and the biomass particle feeding hopper.
Furthermore, a mechanical atomization device for atomizing the amino reducing agent is arranged in the amino reducing agent spray gun.
Furthermore, the amino reducing agent supply system comprises an amino reducing agent storage tank, a feeding pump, a flow meter, an amino reducing agent control valve, a first processor and an NO concentration detection probe;
the amino reducing agent in the amino reducing agent storage tank comprises at least one of liquid ammonia, urea and ammonia, and the outlet of the amino reducing agent storage tank is sequentially provided with a feeding pump, a flow meter and an amino reducing agent control valve through a connecting pipeline;
the input end of the first processor is connected with the NO concentration detection probe, and the output end of the first processor is connected with the amino reducing agent control valve;
the NO concentration monitoring probe is arranged between the first-stage SNCR denitration reactor and the SOFA air nozzle.
Furthermore, the first-stage SNCR denitration reactor is arranged at a hearth below a flame folding angle of the boiler, and a first-stage SNCR control valve is arranged on a pipeline connected with an amino reducing agent supply system; the amino reducing agent spray gun of the first-stage SNCR denitration reactor adopts six short spray guns; the three layers are arranged in two layers, and each layer is evenly provided with three layers.
Furthermore, a second-stage SNCR control valve is arranged on a pipeline connecting the second-stage SNCR denitration reactor with the amino reducing agent supply system;
the amino reducing agent spray gun of the second-stage SNCR denitration reactor adopts six long spray guns, the left wall and the right wall are symmetrically arranged, and three spray guns are respectively arranged from high to low.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses a pyrolysis charcoal and mixed flue gas that produce in the pyrolysis process of the living beings pyrolysis system who connects on the boiler send into the different regions of furnace through arranging the low-nitrogen combustor and the living beings pyrolysis gas spout in the different regions of furnace inside respectively and participate in classification, and the heterogeneous reduction reaction takes place for the nitrogen oxide that the pyrolysis charcoal can generate with the main combustion zone, reduces the interior nitrogen oxide of stove, and mixed flue gas lets in the reburning zone, takes place homogeneous reduction reaction with the interior nitrogen oxide of stove, generates nitrogen and water to furnace outlet nitrogen oxide emission has been reduced; meanwhile, an amino reducing agent supply system is connected with amino reducing agent spray guns of the first-stage SNCR denitration reactor and the second-stage SNCR denitration reactor which are arranged on the boiler, and the arrangement of the two-stage SNCR denitration devices can improve the mixing effect of the reducing agent and the flue gas and further improve the SNCR denitration efficiency; moreover, the SOFA nozzle arranged in the burnout area is beneficial to the burnout of the reburning fuel and the coal dust; through the arrangement, the discharge amount of nitrogen oxides of the coal-fired boiler is effectively reduced, SCR (selective catalytic reduction) can be replaced for medium-high volatile coal such as bituminous coal, brown coal and the like, and the discharge concentration of the nitrogen oxides can be reduced to 50mg/m by spraying biomass pyrolysis gas and a high-temperature ammonia spraying technology3Below, the inside denitration efficiency of furnace has effectively been improved.
Further, the utility model discloses an adopt ball mill and cyclone to carry out the pyrolysis classification to living beings to the pyrolysis gas spray gun of the gaseous phase exit through cyclone will mix the flue gas and send into living beings pyrolysis gas spout, and the pyrolysis charcoal export through cyclone sends into the low-nitrogen combustor with the pyrolytic carbon in, carries out effectual categorised transport, thereby reduces the nitrogen oxide in furnace export and the furnace.
Further, the utility model discloses a cyclone includes the cyclone of two-stage series connection, makes living beings pyrolysis product carry out the secondary pyrolysis through first order cyclone and second level cyclone, effectively increases the dwell time of living beings in the high temperature flue gas, guarantees the pyrolysis effect to make whole pyrolytic reaction more abundant completely.
Furthermore, the utility model adopts the mode that the high-temperature flue gas extraction pipeline is arranged at the horizontal flue of the boiler in front of the high-temperature superheater, and the high-temperature flue gas is sent into the high-temperature flue gas inlet end of the ball mill, so that the biomass fuel can be further heated, and the pyrolysis effect and efficiency are ensured; meanwhile, by arranging the hand valve, when biomass particles are insufficient in the operation process, the hand valve is closed, no air leakage into the ball mill is ensured, and the operation is convenient and reliable.
Further, the utility model discloses a set up mechanical atomization device in amino reducing agent spray gun, can further atomize amino reducing agent, guarantee the reaction effect.
Furthermore, the utility model adopts the amino reducing agent supply system composed of the amino reducing agent storage tank, the feeding pump, the flowmeter, the amino reducing agent control valve, the first processor and the NO concentration detection probe, so that the supply of the amino reducing agent can be effectively ensured according to the actual requirement, and the operation efficiency of the system is ensured; meanwhile, the NO concentration is detected through the first processor and the NO concentration detection probe, the opening degree of the amino reducing agent control valve can be controlled according to the detected NO concentration and the set threshold value of the ammonia-nitrogen ratio, and the method is reliable, accurate and convenient to operate.
Furthermore, the utility model discloses a mode that sets up first grade SNCR denitration reactor below boiler dog-ear angle, set up second grade SNCR denitration reactor between platen superheater and high temperature superheater, because contain alkali metal in the living beings pyrolysis, alkali metal volatilizees into gas in the pyrolysis process, enters into furnace along with pyrolysis gas, and alkali metal has catalytic action to the denitration reaction, can widen the temperature window of SNCR reaction, improves SNCR denitration efficiency; in addition, the first and second-stage SNCR denitration reactors are arranged in a partitioning mode, the variable load adjusting capacity of the SNCR can be improved, the number, the shape and the arrangement mode of spray guns in the first and second-stage SNCR denitration reactors are different, the reducing agent can be guaranteed to cover the whole horizontal flue, the reducing agent and flue gas are mixed more uniformly, and therefore the denitration efficiency is improved.
Further, the utility model discloses send into the pyrolysis charcoal that the living beings pyrolysis in-process produced and mixed flue gas respectively the inside different regions of boiler furnace and carry out classification, carry out SNCR denitration reaction in different positions of boiler department moreover, can effectively reduce coal fired boiler nitrogen oxide emission under different unit loads, to the well volatile coal types such as soft coal, brown coal, can replace SCR, have good economic benefits and environmental benefit.
Drawings
Fig. 1 is a schematic structural diagram of the system according to the embodiment of the present invention.
In the figure: 1-an amino reducing agent storage tank; 2-a feed pump; 3-a flow meter; a 4-amino reducing agent control valve; 5-first stage SNCR control valve; 6-second stage SNCR control valve; 7-a boiler; 8-low nitrogen burner; 9-biomass pyrolysis gas nozzle; 10-SOFA wind nozzle; 11-NO concentration detection probe; 12-a first stage SNCR denitrification reactor; 13-platen superheater; 14-a second stage SNCR denitrification reactor; 15-high temperature superheater; 16-a first stage cyclone separator; 17-a second stage cyclone separator; 18-a biomass particle hopper; 19-ball mill; 20-a high-temperature flue gas extraction pipeline; 21-primary air carrying pulverized coal; 22-hand valve.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
A biomass pyrolysis and reburning synergetic SNCR denitration system is shown in figure 1 and comprises a boiler 7, a biomass pyrolysis system, an amino reducing agent spraying system and a two-stage SNCR denitration device, wherein the two-stage SNCR denitration device consists of a first-stage SNCR denitration reactor 12 and a second-stage SNCR denitration reactor 14;
the boiler 7 is sequentially provided with a main burning area, a reburning area and a burnout area from bottom to top; the boiler 7 is provided with a low-nitrogen burner 8 in a main combustion area, a biomass pyrolysis gas nozzle 9 in a reburning area, and a SOFA air nozzle 10 in a burnout area; a first-stage SNCR denitration reactor 12 is arranged below a flame folding angle of a hearth of the boiler 7, and a flue at the top of the boiler 7 is sequentially provided with a platen superheater 13 and a high-temperature superheater 15; a second-stage SNCR denitration reactor 14 is arranged between the platen superheater 13 and the high-temperature superheater 15.
Preferably, the first-stage SNCR denitration reactor 12 is provided with 6 short spray guns which are arranged in two layers, and each layer is uniformly provided with 3 spray guns; the second-stage SNCR denitration reactor 14 is provided with 6 long spray guns, the left wall and the right wall are symmetrically arranged, 3 spray guns are arranged from high to low respectively, and through the arrangement, the reducing agent can be ensured to cover the whole horizontal flue, so that the reducing agent and the flue gas are mixed more uniformly, and the denitration efficiency is improved.
Preferably, the high-temperature and low-oxygen flue gas at the position between the platen superheater 13 and the high-temperature superheater 15 has the flue gas temperature of 700-1100 ℃ and the oxygen concentration of 3-5%.
The biomass pyrolysis system comprises a biomass particle feeding hopper 18, a ball mill 19, a first-stage cyclone separator 16, a second-stage cyclone separator 17 and a pyrolysis gas spray gun which are connected in sequence; a solid phase outlet of the biomass pyrolysis system is connected with the low-nitrogen combustor 8 through a pyrolysis carbon outlet pipeline, and a gas phase outlet is connected with a biomass pyrolysis gas nozzle 9 through a mixed gas outlet pipeline; an input end of a high-temperature flue gas extraction pipeline 20 is arranged between the second-stage SNCR denitration reactor 14 and the high-temperature superheater 15, and an output end of the high-temperature flue gas extraction pipeline 20 is connected with a heat supply end of the biomass pyrolysis device; a hand valve 22 is arranged between the biomass particle feeding hopper 18 and the ball mill 19, and when biomass particles are insufficient in the operation process, the hand valve 22 is closed, so that no air leaks into the ball mill 19.
The amino reducing agent supply system comprises an amino reducing agent storage tank 1, a feeding pump 2, a flow meter 3 and an amino reducing agent control valve 4 which are sequentially connected, wherein the output end of the amino reducing agent control valve 4 is connected with the input ends of control valves (namely a first-stage SNCR control valve 5 and a second-stage SNCR control valve 6) corresponding to an ammonia first-stage SNCR denitration reactor 12 and a second-stage SNCR denitration reactor 14;
the amino reducing agent supply system also comprises a first processor and an NO concentration detection probe 11 arranged at a hearth outlet of the boiler 7; the NO concentration monitoring probe 11 is arranged between the first-stage SNCR denitration reactor 12 and the SOFA air nozzle 10; the input end of the first processor is connected with the NO concentration detection probe 11, the output end of the first processor is connected with the control end of the amino reducing agent control valve 4, and the first processor is used for controlling the opening of the amino reducing agent control valve 4 according to the detected NO concentration and the set threshold of the ammonia-nitrogen ratio.
Preferably, the amino reducing agent in the amino reducing agent storage tank 1 comprises at least one of liquid ammonia, urea and ammonia water.
Preferably, a mechanical atomization device for atomizing the amino reducing agent is arranged in the amino reducing agent spray gun.
In practical application, the system of the present invention comprises the following steps,
when the load of the boiler 7 is 50% -100%, the reburning fuel ratio is 10%, so that the excess air coefficient of a reburning area is kept at 0.7-0.9, a SOFA air nozzle 10 is arranged in a burnout area, and the air quantity is 20% -30% of the total air quantity;
when the load of the boiler 7 is 30% -50%, the reburning fuel ratio is 20%, so that the excess air coefficient of a reburning area is kept at 0.7-0.9, a SOFA air nozzle 10 is arranged in a burnout area, and the air quantity is 20% -30% of the total air quantity;
the generated mixed flue gas of the pyrolysis gas and the flue gas enters a boiler reburning area through a pyrolysis gas spray gun from the upper part of the second-stage cyclone separator 17;
the produced pyrolytic carbon falls from the bottoms of the first-stage cyclone separator 16 and the second-stage cyclone separator 17 respectively and is carried by nitrogen in a nitrogen conveying pipeline to enter a main combustion area.
The two-stage cyclone separation device can effectively prolong the retention time of the biomass in the high-temperature flue gas and promote the pyrolysis reaction to be completely carried out;
step 4, converting the required ammonia amount according to the set threshold of the ammonia-nitrogen ratio by the NO concentration detected by an NO concentration detection probe 11 arranged at the outlet of a hearth of the boiler 7, and controlling the total injection amount of the amino reducing agent injected by the two-stage SNCR denitration device by a first-stage SNCR control valve 5 and a second-stage SNCR control valve 6 to control the ammonia-nitrogen ratio NSR to be between 1 and 2; the flowmeter 3 measures and displays the total sprayed amount of the amino reducing agent in real time;
step 5, when the unit load is 50-100%, the flue gas temperature of the first-stage SNCR denitration reactor 12 is 1000-;
when the boiler load is 30-50%, the smoke temperature is reduced, the inlet temperature of the first-stage SNCR denitration reactor 12 is 900-.
Based on any of the above systems, the working principle of the present invention is as follows, including,
adjusting and setting corresponding boiler working parameters according to the load condition of the boiler, and respectively controlling the injection amount of the amino reducing agent in the first-stage SNCR denitration reactor 12 and the second-stage SNCR denitration reactor 14;
according to the working parameters of the boiler, biomass is sent into a biomass pyrolysis system for pyrolysis, and the produced pyrolytic carbon is sent into a low-nitrogen combustor 8 to generate out-of-phase reduction reaction with nitrogen oxide generated in a main combustion area of the boiler 7; the generated mixed flue gas is sent into a biomass pyrolysis gas nozzle 9 to perform homogeneous phase reduction reaction with nitrogen oxides in a reburning area of a boiler 7;
according to the injection amount of the amino reducing agent in the first-stage SNCR denitration reactor 12 and the second-stage SNCR denitration reactor 14, the amino reducing agent is fed into a two-stage SNCR denitration device through an amino reducing agent supply system to perform reduction reaction with NO in the flue gas to generate N2And H2O。
Adjusting and setting corresponding boiler working parameters according to different boiler load conditions; specifically, the method comprises the following steps of,
when the load of the boiler 7 is 50% -100%, the reburning fuel ratio is 10%, the reburning area excess air coefficient range is 0.7-0.9, and the air quantity of the SOFA air nozzle 10 is 20% -30% of the total air quantity; the spraying amount of the reducing agent of the first-stage SNCR denitration reactor 12 is 10-20% of the total spraying amount, and the spraying amount of the reducing agent of the second-stage SNCR denitration reactor 14 is 80-90% of the total spraying amount;
when the load of the boiler 7 is 30-50%, the reburning fuel ratio is 20%, the reburning area excess air coefficient range is 0.7-0.9, and the air quantity of the SOFA air nozzle 10 is 20-30% of the total air quantity; the spraying amount of the reducing agent of the first-stage SNCR denitration reactor 12 is 80-90% of the total spraying amount, and the spraying amount of the reducing agent of the second-stage SNCR denitration reactor 14 is 10-20% of the total spraying amount.
Claims (8)
1. A biomass pyrolysis and reburning cooperative SNCR denitration system is characterized by comprising a biomass pyrolysis system, an amino reducing agent supply system and a two-stage SNCR denitration device, wherein the biomass pyrolysis system, the amino reducing agent supply system and the two-stage SNCR denitration device are connected to a boiler (7);
the two-stage SNCR denitration device comprises a first-stage SNCR denitration reactor (12) and a second-stage SNCR denitration reactor (14);
the boiler (7) is sequentially provided with a low-nitrogen burner (8) positioned in a main combustion area, a biomass pyrolysis gas nozzle (9) positioned in a reburning area, a SOFA air nozzle (10) positioned in a burnout area and a first-stage SNCR denitration reactor (12) from bottom to top; a screen type superheater (13), a second-stage SNCR denitration reactor (14) and a high-temperature superheater (15) are sequentially arranged at the horizontal flue of the hearth;
a solid phase outlet of the biomass pyrolysis system is connected with a low-nitrogen burner (8), and a gas phase outlet is connected with a biomass pyrolysis gas nozzle (9);
and the output end of the amino reducing agent supply system is respectively connected with an amino reducing agent spray gun of the first-stage SNCR denitration reactor (12) and the second-stage SNCR denitration reactor (14).
2. The SNCR denitration system based on biomass pyrolysis and reburning cooperation is characterized in that the biomass pyrolysis system comprises a ball mill (19), a biomass particle feeding hopper (18) arranged at a feeding port of the ball mill (19), a cyclone separator connected with an outlet of the ball mill (19), and a pyrolysis gas spray gun arranged on a gas phase outlet pipeline of the cyclone separator;
and a gas-phase outlet of the cyclone separator is connected with a biomass pyrolysis gas nozzle (9), and a solid-phase outlet is connected with a low-nitrogen combustor (8).
3. The system for collaborative SNCR denitration by biomass pyrolysis and reburning according to claim 2, wherein the cyclone comprises a first stage cyclone (16) and a second stage cyclone (17); an inlet of the first-stage cyclone separator (16) is connected with an outlet of the ball mill (19), a pyrolytic carbon outlet is connected with the low-nitrogen combustor (8), and a gas-phase outlet is connected with an inlet of the second-stage cyclone separator (17); a pyrolytic carbon outlet of the second-stage cyclone separator (17) is connected with the low-nitrogen combustor (8), and a gas-phase outlet is connected with a biomass pyrolysis gas nozzle (9); and the pyrolytic carbon outlets of the first-stage cyclone separator (16) and the second-stage cyclone separator (17) are respectively connected with a nitrogen conveying pipeline.
4. The SNCR denitration system for biomass pyrolysis and reburning cooperation is characterized in that a high-temperature flue gas extraction pipeline (20) communicated with a horizontal flue in front of a high-temperature superheater (15) is arranged on the ball mill (19); a hand valve (22) is arranged between the ball mill (19) and the biomass particle feeding hopper (18).
5. The system for collaborative SNCR denitration by biomass pyrolysis and reburning is characterized in that a mechanical atomization device for atomizing an amino reducing agent is arranged in the amino reducing agent spray gun.
6. The SNCR denitration system based on biomass pyrolysis and reburning cooperation is characterized in that the amino reducing agent supply system comprises an amino reducing agent storage tank (1), a feeding pump (2), a flow meter (3), an amino reducing agent control valve (4), a first processor and an NO concentration detection probe (11);
the amino reducing agent in the amino reducing agent storage tank (1) comprises at least one of liquid ammonia, urea and ammonia, and the outlet of the amino reducing agent storage tank is sequentially provided with a feeding pump (2), a flow meter (3) and an amino reducing agent control valve (4) through a connecting pipeline;
the input end of the first processor is connected with a NO concentration detection probe (11), and the output end of the first processor is connected with an amino reducing agent control valve (4);
the NO concentration detection probe (11) is arranged between the first-stage SNCR denitration reactor (12) and the SOFA air nozzle (10).
7. The biomass pyrolysis reburning cooperative SNCR denitration system according to claim 1, wherein the first-stage SNCR denitration reactor (12) is arranged at a hearth below a flame break angle of the boiler (7), and a first-stage SNCR control valve (5) is arranged on a pipeline connected with an amino reducing agent supply system; the amino reducing agent spray gun of the first-stage SNCR denitration reactor (12) adopts six short spray guns; the three layers are arranged in two layers, and each layer is evenly provided with three layers.
8. The biomass pyrolysis reburning cooperative SNCR denitration system according to claim 7, wherein a second-stage SNCR control valve (6) is arranged on a pipeline connecting the second-stage SNCR denitration reactor (14) and the amino reducing agent supply system;
the amino reducing agent spray gun of the second-stage SNCR denitration reactor (14) adopts six long spray guns, the left wall and the right wall are symmetrically arranged, and three spray guns are respectively arranged from high to low.
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