CN101761920B - Method and device for burning low NOx by utilizing reburning of pulverized coal pyrolysis gas - Google Patents

Method and device for burning low NOx by utilizing reburning of pulverized coal pyrolysis gas Download PDF

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Publication number
CN101761920B
CN101761920B CN2009102012233A CN200910201223A CN101761920B CN 101761920 B CN101761920 B CN 101761920B CN 2009102012233 A CN2009102012233 A CN 2009102012233A CN 200910201223 A CN200910201223 A CN 200910201223A CN 101761920 B CN101761920 B CN 101761920B
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China
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coal
pyrolysis
pulverized coal
pulverized
combustion
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CN2009102012233A
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Chinese (zh)
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CN101761920A (en
Inventor
金晶
沙永涛
江鸿
刘瑞
宋博
路遥
蔡灿稳
何丹丹
张忠孝
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上海理工大学
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Abstract

The invention discloses a method and device for burning low NOx by utilizing reburning of pulverized coal pyrolysis gas. The method comprises the following steps: quickly pyrolizing the pulverized coal by utilizing partial hot smoke gas of a tail flue of a pulverized coal boiler entering a pyrolysis reactor; delivering the pulverized coal pyrolysis gas serving as the gas reburning fuel into a reburning area of the pulverized coal boiler to perform high-efficiency NOx reduction, and completely burning the gas reburning fuel subjected to NOx reduction in a burning-out area of the pulverized coal boiler to discharge the low NOx of the pulverized coal boiler; and allowing semicoke which is produced through the pulverized coal pyrolysis to enter a main burning area of the pulverized coal boiler which is carried by primary air to finish burning. The device of the technique mainly comprises a pulverized coal quick pyrolysis device, a pulverized coal flue gas circulating system, a boiler low NOx burning system and a pipeline which is connected with the boiler low NOx burning system. The method and the device have the advantages of simple structure, low investment, high denitration efficiency, and wide application prospect.

Description

A kind of low NO that utilizes pulverized coal pyrolysis gas to fire again xCombustion method and device
Technical field
The present invention relates to pulverized-coal fired boiler and reduce NO xThe combustion method again and the device thereof of discharging are specifically related to utilize the cycling hot flue gas that pulverized coal pyrolysis institute calorific requirement is provided, and fire with pulverized coal pyrolysis gas again and realize the low NO of pulverized-coal fired boiler xThe combustion method and the device thereof of discharging belong to the new method and the new equipment in the clean utilization field of the energy.
Background technology
Industries such as the electric power of China, iron and steel, metallurgy are main with fire coal all.In recent years, along with the expansion of producing, coal consumption constantly increases, and the discharging of nitrogen oxide also presents the trend of quick growth.Along with the raising of environmental requirement, the discharging of control nitrogen oxide becomes inevitable.Combustion technology is as low NO again xCombustion technology a kind of, efficient is high, cost is low, finds broad application day by day.Natural gas, coke-stove gas, biogas, subterranean coal gas etc. can be as gas reburning fuel, but often receive the restriction of gas reburning fuel source for specific coal-powder boiler, have the worry of input-output ratio aspect.How implement a cover small investment, combustion system that efficient is high, simple and reliable for structure with suiting measures to local conditions, become the key of promoting the denitration by refueling technology.
Summary of the invention
The invention provides a kind of with flue gas recirculation technology, coal dust fast pyrolysis technology and the integrated application of gas reburning technology, the low NO of realization pulverized-coal fired boiler xThe new method and the device thereof of discharging.
Know-why of the present invention
The coal dust that a part of coal dust boiler is personal is sent in the coal dust fast pyrolysis reactor; Simultaneously the portion of hot flue gas of boiler self is drawn back in the fast pyrolysis reactor; The heating coal dust makes its pyrolysis; The pyrolysis gas that produces burns as the combustion zone again that reburning fuel is sent into pulverized-coal fired boiler, realizes the gas reburning denitration.
Technical scheme of the present invention
A kind of low NO that utilizes pulverized coal pyrolysis gas to fire again xThe device of combustion method
A kind of low NO that utilizes pulverized coal pyrolysis gas to fire again xThe device of combustion method,
Comprise reheater 13, high temperature convection superheater 14, low temperature convection superheater 15, boiler back end ductwork 16, economizer 17, air preheater 18, deduster 19, air-introduced machine 20, an airduct 21, coal dust rapid pyrolysis apparatus, flue gas recirculation system and pulverized-coal fired boiler hang down NO xThe pipeline of combustion system and connection thereof;
The coal dust rapid pyrolysis apparatus by Pulverized Coal Bin 1, coal bunker 2, pyrolysis reactor 3, remove slag ladle 4 and form;
The flue gas recirculation system is made up of cyclone separator 5, blower fan 6 and flue gas recirculation pipeline 7;
Pulverized-coal fired boiler hangs down NO xCombustion system is made up of coal nozzle 10, pyrolysis gas jets 11, air nozzle 12 and Pulverized Coal fired Boiler Furnace 25;
Pulverized-coal fired boiler hangs down NO xThe connecting line of combustion system is made up of pulverized coal channel 9, pulverized coal pyrolysis gas conveyance conduit 8;
The Pulverized Coal Bin 1 of coal dust rapid pyrolysis apparatus links to each other with coal bunker 2 through conveyance conduit; The bottom of coal bunker 2 links to each other with the top of pyrolysis reactor 3; And pyrolysis reactor 3 tops also link to each other with flue gas recirculation pipeline 7; Pyrolysis reactor 3 bottoms with remove slag ladle 4 and link to each other, remove the outlet of slag ladle 4 lower bank and an airduct 21 and converge and then link to each other with pulverized coal channel 9, pyrolysis reactor 3 lower side link to each other with cyclone separator 5 through pipeline; The top of cyclone separator 5 links to each other with pulverized coal pyrolysis gas conveyance conduit 8 through blower fan 6, and the outlet of cyclone separator 5 passes through pipeline and links to each other except that slag ladle 4;
Coal nozzle 10, pyrolysis gas jets 11, air nozzle 12 are separately positioned in the primary zone 22, reburning zone 23, burnt zone 24 of Pulverized Coal fired Boiler Furnace 25; And pulverized-coal fired boiler hangs down NO xCoal nozzle 10 in the combustion system links to each other with pulverized coal channel 9; Pyrolysis gas jets 11 links to each other with pulverized coal pyrolysis gas conveyance conduit 8;
Flue gas recirculation pipeline 7 is connected with boiler back end ductwork 16.
All there is insulation described flue gas recirculation pipeline 7, pulverized coal pyrolysis gas conveyance conduit 8 outsides.
A kind of low NO that utilizes pulverized coal pyrolysis gas to fire again xCombustion method comprises the steps:
(1), the hot flue gas of about 600 ℃ of the parts of returning from pulverized-coal fired boiler back-end ductwork 16 circulation through flue gas recirculation pipeline 7 with from coal bunker 1 through coal dust that coal bunker 2 is sent here and flow into and carry out pyrolytic reaction in the fast pyrolysis reactor 3, the control pyrolysis reaction temperature is about 500 ℃ of left and right sides reaction time 5s;
The semicoke that pulverized coal pyrolysis produces is in pyrolysis reactor 3 bottom sedimentations, and is stored in except that in the slag ladle 4;
The pyrolysis gas that pulverized coal pyrolysis produces is discharged through pipeline from pyrolysis reactor 3 lower side;
(2), carried through the low NO of pulverized coal channel 9 and pulverized-coal fired boiler by a wind in an airduct 21 from the semicoke that comes out except that slag ladle 4 in the step (1) xCoal nozzle 10 entering primary zones, 22 burnings of combustion system;
Controlling the wind speed in the airduct 21 is about 20m/s;
(3), pyrolysis reactor 3 lower side feed the low NO of pulverized-coal fired boiler through the pyrolysis gas that pipeline comes out through cyclone separator 5, air-introduced machine 6, pulverized coal pyrolysis gas conveyance conduit 8 in the step (1) xPyrolysis gas jets 11 backs of combustion system get into reburning zone 23, the NO that contains that burns and form in back and coal-powder boiler primary zone 22 xFlue gas mix, reaction, with most of NO xBe reduced into N 2, get into burnt zone 24 then and mix with the burnt wind that sprays into by air nozzle 12, realize completing combustion;
The wind speed of the burnt wind that control air nozzle 12 sprays into is about 40m/s;
(4), process reheater 13, high temperature convection superheater 14, low temperature convection superheater 15, economizer 17, air preheater 18, deduster 19, air-introduced machine 20 are finally accomplished the low NO that pulverized coal pyrolysis gas fires again to chimney to the flue gas after step (3) completing combustion successively xBurning.
Beneficial effect of the present invention
The present invention mainly utilizes the fuel coal dust identical with pulverized-coal fired boiler to carry out fast pyrogenation; The pyrolysis gas that produces is accomplished gas reburning; Both realized the unification of first and second fuel; Solve the problem that resources such as natural gas, subterranean coal gas are limited by the region, do not influenced basically under the condition of the original combustion position of pulverized-coal fired boiler again, realized NO xEfficient reduction, effectively reduce the discharging of nitrogen oxide, realize denitration efficiency 60%~70%.Owing to utilize pulverized-coal fired boiler portion of hot flue gas to provide pulverized coal pyrolysis needed heat, do not need extra thermal source, realized energy conservation, be easy to existing boiler is transformed, and not limited by regions resources, this system is simple and reliable, is convenient to management.
The present invention is specially adapted to pulverized-coal fired boiler, the NO of especially big-and-middle-sized station boiler xEmission control has broad application prospects.
Description of drawings
Fig. 1 is an apparatus structure sketch map of the present invention;
The specific embodiment
Below through embodiment and combine accompanying drawing that the present invention is further specified, but do not limit the present invention.
Embodiment 1
A kind of low NO that utilizes pulverized coal pyrolysis gas to fire again xThe device of combustion method is seen accompanying drawing 1.
A kind of low NO that utilizes pulverized coal pyrolysis gas to fire again xThe device of combustion method; Comprise reheater 13, high temperature convection superheater 14, low temperature convection superheater 15, economizer 17, air preheater 18, deduster 19, air-introduced machine 20, an airduct 21; Back-end ductwork 16, coal dust rapid pyrolysis apparatus, flue gas recirculation system and coal-powder boiler hang down NO xThe pipeline of combustion system and connection thereof;
The coal dust rapid pyrolysis apparatus by Pulverized Coal Bin 1, coal bunker 2, pyrolysis reactor 3, remove slag ladle 4 and form;
The flue gas recirculation system is made up of cyclone separator 5, blower fan 6 and flue gas recirculation pipeline 7;
Pulverized-coal fired boiler hangs down NO xCombustion system is made up of coal nozzle 10, pyrolysis gas jets 11, air nozzle 12 and Pulverized Coal fired Boiler Furnace 25;
Pulverized-coal fired boiler hangs down NO xThe connecting line of combustion system is made up of pulverized coal channel 9, pulverized coal pyrolysis gas conveyance conduit 8;
The Pulverized Coal Bin 1 of coal dust rapid pyrolysis apparatus links to each other with coal bunker 2 through conveyance conduit; The bottom of coal bunker 2 links to each other with the top of pyrolysis reactor 3; And pyrolysis reactor 3 tops also link to each other with flue gas recirculation pipeline 7; Pyrolysis reactor 3 bottoms with remove slag ladle 4 and link to each other, remove the outlet of slag ladle 4 lower bank and an airduct 21 and converge and then link to each other with pulverized coal channel 9, pyrolysis reactor 3 lower side link to each other with cyclone separator 5 through pipeline; The top of cyclone separator 5 links to each other with pulverized coal pyrolysis gas conveyance conduit 8 through blower fan 6, and the outlet of cyclone separator 5 passes through pipeline and links to each other except that slag ladle 4.
Coal nozzle 10, pyrolysis gas jets 11, air nozzle 12 are separately positioned in the primary zone 22, reburning zone 23, burnt zone 24 of Pulverized Coal fired Boiler Furnace 25; And coal-powder boiler hangs down NO xCoal nozzle 10 in the combustion system links to each other with pulverized coal channel 9; Pyrolysis gas jets 11 links to each other with pulverized coal pyrolysis gas conveyance conduit 8; Flue gas recirculation pipeline 7 is connected with boiler back end ductwork 16.All there is insulation described flue gas recirculation pipeline 7, pulverized coal pyrolysis gas conveyance conduit 8 outsides.
Embodiment 2
A kind of low NO that utilizes pulverized coal pyrolysis gas to fire again xCombustion method
Pulverized-coal fired boiler flue gas about 25% is taken out through blower fan 6 and is drawn, and returns through flue gas recirculation pipeline 7 with the coal dust of sending here through sealing gravity feeding coal bunker 2 from coal bunker 1 and flow into and carry out pyrolytic reaction in the fast pyrolysis reactor 3 from back-end ductwork 16 circulation.The flue-gas temperature at back-end ductwork 16 places is about 600 ℃; The coal dust that gets into fast pyrolysis reactor accounts for about 30% of the total powder-feeding amount of pulverized-coal fired boiler, and the control pyrolysis reaction temperature is about 500 ℃, about reaction time 5S.
Through the cycling hot flue gas heating, the pyrolysis gas that the coal dust fast pyrogenation produces comes out from pyrolysis reactor 3 lower side, feeds the low NO of pulverized-coal fired boiler through cyclone separator 5, air-introduced machine 6, pulverized coal pyrolysis gas conveyance conduit 8 xThe pyrolysis gas jets 11 of combustion system.
The semicoke that pulverized coal pyrolysis produces is in pyrolysis reactor 3 bottom sedimentations, and is stored in except that in the slag ladle 4.Regularly under the carrying of an airduct 21, get into low NO through pulverized coal channel 9 from the semicoke that comes out except that slag ladle 4 xThe coal nozzle 10 of combustion system.Controlling the wind speed in the airduct 21 is about 20m/s.
Main fuel coal dust and semicoke are through low NO xThe coal nozzle 10 of combustion system gets into 22 burnings of primary zone, Pulverized Coal fired Boiler Furnace bottom, keeps about excess air coefficient α=1.15 in the primary zone in, and burning formation contains a large amount of NO xFlue gas.
Pulverized coal pyrolysis gas is through the low NO of pulverized-coal fired boiler xThe pyrolysis gas jets 11 entering reburning zones 23 of combustion system, this district excess air coefficient α=about 0.5 are reducing atmosphere.The NO that contains that in the reburning zone 23 burn and form in pyrolysis gas and pulverized-coal fired boiler primary zone 22 xFlue gas mix, reaction, with most of NO xBe reduced into N 2, realize denitration efficiency about 70%.Flue gas entering burnt zone 24 mixes with the burnt wind that is sprayed into by air nozzle 12 then, realizes completing combustion.Excess air coefficient α in the burnt zone 24=about 1.15 are about the wind speed 40m/s of the burnt wind that control air nozzle 12 sprays into.
The flue gas of discharging boiler furnace 25 arrives chimney through reheater 13, high temperature convection superheater 14, low temperature convection superheater 15, economizer 17, air preheater 18, deduster 19, air-introduced machine 20 successively, finally accomplishes pulverized coal pyrolysis gas and fires low NO again xCombustion process.

Claims (3)

1. low NO who utilizes pulverized coal pyrolysis gas to fire again xThe device of combustion method; Comprise reheater (13), high temperature convection superheater (14), low temperature convection superheater (15), boiler back end ductwork (16), economizer (17), air preheater (18), deduster (19), air-introduced machine (20), an airduct (21), it is characterized in that also comprising that coal dust rapid pyrolysis apparatus, flue gas recirculation system and pulverized-coal fired boiler hang down NO xThe pipeline of combustion system and connection thereof;
The coal dust rapid pyrolysis apparatus by Pulverized Coal Bin (1), coal bunker (2), pyrolysis reactor (3), remove slag ladle (4) and form;
The flue gas recirculation system is made up of cyclone separator (5), blower fan (6) and flue gas recirculation pipeline (7);
Pulverized-coal fired boiler hangs down NO xCombustion system is made up of coal nozzle (10), pyrolysis gas jets (11), air nozzle (12) and Pulverized Coal fired Boiler Furnace (25);
Pulverized-coal fired boiler hangs down NO xThe connecting line of combustion system is made up of pulverized coal channel (9), pulverized coal pyrolysis gas conveyance conduit (8);
The Pulverized Coal Bin of coal dust rapid pyrolysis apparatus (1) links to each other with coal bunker (2) through conveyance conduit; The bottom of coal bunker (2) links to each other with the top of pyrolysis reactor (3); And pyrolysis reactor (3) top also links to each other with flue gas recirculation pipeline (7); Pyrolysis reactor (3) bottom with remove slag ladle (4) and link to each other, remove an outlet of slag ladle (4) lower bank and an airduct (21) and converge and then link to each other with pulverized coal channel (9), pyrolysis reactor (3) lower side links to each other with cyclone separator (5) through pipeline; The top of cyclone separator (5) links to each other with pulverized coal pyrolysis gas conveyance conduit (8) through blower fan (6), and the outlet of cyclone separator (5) passes through pipeline and links to each other except that slag ladle (4);
Coal nozzle (10), pyrolysis gas jets (11), air nozzle (12) are separately positioned in the primary zone (22), reburning zone (23), burnt zone (24) of Pulverized Coal fired Boiler Furnace (25); And pulverized-coal fired boiler hangs down NO xCoal nozzle in the combustion system (10) links to each other with pulverized coal channel (9), and pyrolysis gas jets (11) links to each other with pulverized coal pyrolysis gas conveyance conduit (8), and flue gas recirculation pipeline (7) is connected with boiler back end ductwork (16).
2. a kind of low NO that utilizes pulverized coal pyrolysis gas to fire again described in claim 1 xThe device of combustion method is characterized in that all there is insulation described flue gas recirculation pipeline (7), pulverized coal pyrolysis gas conveyance conduit (8) outside.
3. low NO who utilizes pulverized coal pyrolysis gas to fire again xCombustion method is characterized in that comprising the steps:
The hot flue gas that the part of (1), returning from pulverized-coal fired boiler back-end ductwork (16) circulation is about 600 ℃ through flue gas recirculation pipeline (7) with from coal bunker (1) through coal dust that coal bunker (2) is sent here and flow in the fast pyrolysis reactor (3) and carry out pyrolytic reaction; The control pyrolysis reaction temperature is about 500 ℃, about reaction time 5S;
The semicoke that pulverized coal pyrolysis produces is in pyrolysis reactor (3) bottom sedimentation, and is stored in except that in the slag ladle (4);
The pyrolysis gas that pulverized coal pyrolysis produces is discharged through pipeline from pyrolysis reactor (3) lower side;
(2), carried through the low NO of pulverized coal channel (9) and pulverized-coal fired boiler by a wind in an airduct (21) from the semicoke that comes out except that slag ladle (4) in the step (1) xThe coal nozzle of combustion system (10) gets into primary zone (22) burning;
The wind speed of controlling in the airduct (21) is about 20m/s;
(3), pyrolysis reactor (3) lower side feeds the low NO of pulverized-coal fired boiler through the pyrolysis gas that pipeline comes out through cyclone separator (5), air-introduced machine (6), pulverized coal pyrolysis gas conveyance conduit (8) in the step (1) xPyrolysis gas jets (11) back of combustion system gets into reburning zone (23), the NO that contains that burns and form in back and coal-powder boiler primary zone (22) xFlue gas mix, reaction, with most of NO xBe reduced into N 2, get into burnt zone (24) then and mix with the burnt wind that sprays into by air nozzle (12), realize completing combustion;
About the wind speed 40m/s of the burnt wind that control air nozzle (12) sprays into;
(4), the flue gas after step (3) completing combustion passes through reheater (13), high temperature convection superheater (14), low temperature convection superheater (15), economizer (17), air preheater (18), deduster (19), air-introduced machine (20) successively to chimney, finally accomplish pulverized coal pyrolysis gas and fire low NO again xBurning.
CN2009102012233A 2009-12-16 2009-12-16 Method and device for burning low NOx by utilizing reburning of pulverized coal pyrolysis gas CN101761920B (en)

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