CN115287097B - Ultra-low emission device for water gas gasification, reduction and denitration of cement kiln - Google Patents
Ultra-low emission device for water gas gasification, reduction and denitration of cement kiln Download PDFInfo
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- CN115287097B CN115287097B CN202210992432.XA CN202210992432A CN115287097B CN 115287097 B CN115287097 B CN 115287097B CN 202210992432 A CN202210992432 A CN 202210992432A CN 115287097 B CN115287097 B CN 115287097B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 238000002309 gasification Methods 0.000 title claims abstract description 71
- 239000004568 cement Substances 0.000 title claims abstract description 24
- 239000002817 coal dust Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 99
- 239000000779 smoke Substances 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 244000261422 Lysimachia clethroides Species 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 6
- 230000036632 reaction speed Effects 0.000 claims description 4
- 230000002829 reductive effect Effects 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 235000012054 meals Nutrition 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 abstract description 3
- 238000005507 spraying Methods 0.000 abstract description 3
- 229910021529 ammonia Inorganic materials 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 49
- 239000003570 air Substances 0.000 description 47
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 24
- 239000003546 flue gas Substances 0.000 description 24
- 230000001939 inductive effect Effects 0.000 description 10
- 238000000354 decomposition reaction Methods 0.000 description 8
- 239000003245 coal Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of cement production environment-friendly equipment, in particular to an ultralow emission device for water gas gasification, reduction and denitration of a cement kiln, wherein a coal dust conveying pipeline is fixedly connected to an inlet of the water gas gasification furnace, a gasification furnace vortex mixing chamber is formed in the front end of the water gas gasification furnace, a gasification furnace air guiding pipe is fixedly connected to an inlet of the gasification furnace vortex mixing chamber, a gasification furnace air guiding pipe high-temperature butterfly valve is arranged on the gasification furnace air guiding pipe, a tertiary air guiding pipe is fixedly connected to the surface of the water gas gasification furnace, a tertiary air guiding pipe high-temperature butterfly valve is fixedly connected to the tertiary air guiding pipe, and an outlet of the water gas gasification furnace is fixedly connected with an inlet of the denitration reduction furnace. According to the invention, by arranging the water gas gasifier, the denitration reduction furnace, the SNCR ammonia spraying system and the ton clinker ammonia water consumption not exceeding 2kg, the cement kiln system can achieve stable high yield, the NOx is less than or equal to 50mg/Nm 3, the ultra-low emission standard is achieved, and the economic and environmental protection indexes are excellent.
Description
Technical Field
The invention relates to the technical field of cement production environment-friendly equipment, in particular to an ultralow emission device for water gas gasification, reduction denitration of a cement kiln.
Background
The fuel calcined by the cement in China basically adopts coal dust, most of NOx is derived from thermal nitrogen generated when a coal dust burner in a rotary kiln burns at high temperature, and a large amount of NOx is discharged to cause acid rain, so that serious environmental pollution is caused, the requirements on NOx discharge indexes are increasingly strict along with the national requirements, and the discharge concentration of partial areas is less than or equal to 50mg/Nm 3;
At present, most cement plants in China adopt a SNCR+ staged combustion denitration technology, the staged combustion space is limited, the denitration efficiency of a staged combustion part can only reach 30-40%, in addition, the denitration of the staged combustion part can only reach 200mg/Nm 3, the final NOx emission concentration can only reach 200mg/Nm 3, the ultra-low emission requirement of partial areas on NOx which is less than or equal to 50mg/Nm 3 is difficult to meet, the injected coal cannot be fully combusted to cause easy skinning and blockage in a subsequent decomposing furnace, the emitted CO concentration exceeds 1000ppm, fuel waste is caused, the heat consumption of a system is increased, in addition, the ammonia water consumption of denitration ton clinker is approximately 5kg, and the operation cost is high.
Disclosure of Invention
The invention aims to provide an ultralow emission device for water gas gasification, reduction and denitration of a cement kiln, aiming at the defects of the prior art, so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: the ultra-low emission device for the water gas gasification, reduction and denitration of the cement kiln comprises a water gas gasification furnace, wherein a water vapor pipeline is fixedly connected to an inlet of the water gas gasification furnace, a coal powder conveying pipeline is fixedly connected to an inlet of the water gas gasification furnace, a gasification furnace vortex mixing chamber is formed in the front end of the water gas gasification furnace, a gasification furnace air guide pipe is fixedly connected to an inlet of the gasification furnace vortex mixing chamber, a gasification furnace air guide pipe high-temperature butterfly valve is arranged on the gasification furnace air guide pipe, a tertiary air guide pipe is fixedly connected to the surface of the water gas gasification furnace, a tertiary air guide pipe high-temperature butterfly valve is fixedly connected to the tertiary air guide pipe, an outlet of the water gas gasification furnace is fixedly connected with an inlet of a denitration reduction furnace, a reduction furnace vortex mixing chamber is formed in the front end of the denitration reduction furnace, a reduction furnace air guide pipe is fixedly connected to an inlet of the reduction furnace vortex mixing chamber, and a reduction furnace air guide pipe high-temperature butterfly valve is fixedly connected to the surface of the reduction furnace air guide pipe; the outlet of the denitration reduction furnace is fixedly connected with the inlet of the decomposing furnace, the inlet of the decomposing furnace is fixedly connected with a tertiary air pipe, and the surface of the water gas gasifier is fixedly connected with an SNCR denitration system.
As a preferable technical scheme of the invention, the smoke chamber is introduced into the high-temperature smoke through the gasifier air-inducing pipe and is connected to the tangential inlet of the vortex mixing chamber of the gasifier, and the high-temperature butterfly valve of the gasifier air-inducing pipe arranged on the surface of the gasifier air-inducing pipe can adjust the air quantity of the high-temperature smoke.
As a preferable technical scheme of the invention, the vortex mixing chamber of the gasifier adopts a volute type design, rotary-cut wind and axial wind are vertically arranged, uniform mixing of materials and smoke is ensured, a stable flow field is generated in the water gas gasifier, skinning can be prevented, and gasification efficiency of water gas is ensured.
As a preferable technical scheme of the invention, the vortex mixing chamber of the reduction furnace is arranged in the opposite direction to the vortex mixing chamber of the gasification furnace, a stream of flue gas is introduced from the right side of the flue chamber to enter the vortex mixing chamber of the reduction furnace, and the water gas and the flue gas from the water gas gasification furnace are further mixed in the vortex mixing chamber of the reduction furnace, so that the reaction speed of the water gas and NOx is accelerated.
As a preferable technical scheme of the invention, the vortex mixing chamber of the reduction furnace adopts a volute type design, a reducing gas inlet is reserved on the volute, and rotary-cut wind and axial wind are vertically arranged.
As a preferable technical scheme of the invention, the gooseneck of the denitration reducing furnace adopts an inclined plate design, so that dust accumulation at the gooseneck is prevented, and the resistance of the denitration reducing furnace is reduced.
As a preferable technical scheme of the invention, the water gas gasifier is an on-line vortex pipeline furnace, one end of the water gas gasifier is connected with the smoke chamber, the other end of the water gas gasifier is connected with the denitration reduction furnace, and water vapor, coal dust and raw meal are added from an inlet.
As a preferable technical scheme of the invention, the denitration reduction furnace is an online vortex pipeline furnace, one end of the denitration reduction furnace is connected with the water gas gasification furnace, and the other end of the denitration reduction furnace is connected with the decomposing furnace.
As a preferable technical scheme of the invention, the top of the decomposing furnace is provided with a reducing gas inlet for removing raw material nitrogen and generated thermal nitrogen in the decomposing furnace.
As a preferable technical scheme of the invention, the water gas gasifier is connected with a tertiary air guiding pipe, and a tertiary air guiding pipe high-temperature butterfly valve arranged on the tertiary air guiding pipe is used as an adjusting device for adjusting the proportion of exhaust.
As a preferable technical scheme of the invention, the SNCR denitration system is positioned at the outlets of the CA and CB cyclone cylinders, and the material of the CA cyclone cylinder is divided into two parts by a three-way valve, one part is fed into the decomposing furnace, and the other part is fed into the water gas gasification furnace.
The beneficial effects of the invention are as follows:
According to the ultralow emission device for the water gas gasification, reduction and denitration of the cement kiln, the water gas gasification furnace, the denitration reduction furnace and the SNCR ammonia spraying system are arranged, the consumption of ammonia water per ton clinker is not more than 2kg, the cement kiln system can achieve stable high yield, the ultralow emission standard of NOx is less than or equal to 50mg/Nm 3, and the economic and environmental protection indexes are excellent.
Drawings
FIG. 1 is a structural layout of the overall device of the present invention;
FIG. 2 is a main structure diagram of the water gas gasifier and the denitration reduction furnace according to the present invention;
FIG. 3 is a top view of the vortex mixing chamber structure of the gasifier according to the present invention;
FIG. 4 is a top view of the vortex mixing chamber structure of the reduction furnace of the present invention;
FIG. 5 is a front view of a gooseneck of a denitration reducing furnace of the present invention.
In the figure: 1. a water gas gasifier; 2. a water vapor pipe; 3. a pulverized coal conveying pipeline; 4. an air guiding pipe of the gasification furnace; 5. high-temperature butterfly valve of air induction pipe of gasifier; 6. a tertiary air guiding pipe; 7. high-temperature butterfly valve of tertiary air guide pipe; 8. a reducing furnace air guide pipe; 9. high-temperature butterfly valve of induced draft tube of reducing furnace; 10. a vortex mixing chamber of the gasification furnace; 11. a reduction furnace vortex mixing chamber; 12. a denitration reduction furnace; 13. a decomposing furnace; 14. a three-way valve; 15. a tertiary air duct; 16. SNCR denitration system.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 5, in the present embodiment: an ultralow emission device for water gas gasification, reduction and denitration of a cement kiln comprises a water gas gasification furnace 1, wherein a water vapor pipeline 2 is fixedly connected to an inlet of the water gas gasification furnace 1, a coal powder conveying pipeline 3 is fixedly connected to an inlet of the water gas gasification furnace 1, a gasification furnace vortex mixing chamber 10 is arranged at the front end of the water gas gasification furnace 1, a gasification furnace air-guiding pipe 4 is fixedly connected to an inlet of the gasification furnace vortex mixing chamber 10, a gasification furnace air-guiding pipe high-temperature butterfly valve 5 is arranged on the gasification furnace air-guiding pipe 4, a tertiary air-guiding pipe 6 is fixedly connected to the surface of the water gas gasification furnace 1, a tertiary air-guiding pipe high-temperature butterfly valve 7 is fixedly connected to the upper part of the tertiary air-guiding pipe 6, an outlet of the water gas gasification furnace 1 is fixedly connected to an inlet of a denitration reduction furnace 12, a reduction furnace vortex mixing chamber 11 is arranged at the front end of the denitration reduction furnace 12, a reduction furnace air-guiding pipe 8 is fixedly connected to an inlet of the reduction furnace vortex mixing chamber 11, and a reduction furnace air-guiding pipe high-temperature 9 is fixedly connected to the upper part of the reduction furnace air-guiding pipe 8; the outlet of the denitration reduction furnace 12 is fixedly connected with the inlet of the decomposing furnace 13, the inlet of the decomposing furnace 13 is fixedly connected with a tertiary air pipe 15, and the outlets of the C5A and C5B cyclone cylinders are provided with an SNCR denitration system 16.
In the embodiment, the water gas gasifier 1 is an on-line vortex pipeline furnace, one end of the water gas gasifier is connected with a smoke chamber, the other end of the water gas gasifier is connected with the denitration reduction furnace 12, and water vapor, coal dust and raw meal are added from an inlet; the smoke chamber is connected with the tangential inlet of the vortex mixing chamber 10 of the gasifier through the gasifier air-inducing pipe 4, and the air quantity of the high-temperature smoke introduced into the gasifier air-inducing pipe can be adjusted by the gasifier air-inducing pipe high-temperature butterfly valve 5 arranged on the gasifier air-inducing pipe 4; the vortex mixing chamber 10 of the gasifier adopts a volute type design, rotary-cut wind and axial wind are vertically arranged, uniform mixing of materials and smoke is ensured, a stable flow field is generated in the water gas gasifier 1, skinning can be prevented, and gasification efficiency of water gas is ensured; the reducing furnace vortex mixing chamber 11 and the gasifier vortex mixing chamber 10 are arranged in the opposite direction, a stream of flue gas is introduced from the right side of the flue chamber and enters the reducing furnace flow mixing chamber 11, and the water gas and the flue gas from the water gas gasifier 1 are further mixed in the reducing furnace vortex mixing chamber 11, so that the reaction speed of the water gas and NOx is accelerated; the vortex mixing chamber 11 of the reduction furnace adopts a volute type design, a reducing gas inlet is reserved on the volute, and rotary-cut wind and axial wind are vertically arranged; the gooseneck of the denitration reducing furnace 12 adopts an inclined plate design, so that dust accumulation at the gooseneck is prevented, and the resistance of the denitration reducing furnace 12 is reduced; the denitration reduction furnace 12 is an online vortex pipeline furnace, one end of the denitration reduction furnace is connected with the water gas gasification furnace 1, and the other end of the denitration reduction furnace is connected with the decomposing furnace 13; the top of the decomposing furnace 13 is provided with a reducing gas inlet for removing raw material nitrogen and generated thermal nitrogen in the decomposing furnace 13; the water gas gasifier 1 is connected with a tertiary air guiding pipe 6, and a tertiary air guiding pipe high-temperature butterfly valve 7 arranged on the tertiary air guiding pipe 6 is used as an adjusting device for adjusting the proportion of exhaust; the SNCR denitration system 16 is positioned at the outlets of the C5A and C5B cyclones, and the material of the C4A cyclone is divided into two parts by a three-way valve 14, one part enters the decomposing furnace 13 and the other part enters the water gas gasification furnace 1.
Working principle: when in use, referring to fig. 1-5, the flue gas from the rotary kiln is divided into three streams at the flue chamber, wherein the air speed of the middle stream of flue gas passing through the throat of the flue chamber is controlled to be 20m/s, a spraying effect is generated, c4A is divided into two streams by an adjustable electric valve, one stream of flue gas is sent into a decomposing furnace 13, the other stream of flue gas is sent into the inlet of a water gas gasifier 1, the sent flue gas is scattered by a diffusion type scattering box, the flue gas is in a suspension state after being blown away, steam is sprayed into the inlet of the water gas gasifier 1, coal dust is introduced into the inlet of the water gas gasifier 1 by a small stream of high-temperature air from a third air introducing pipe 6, the third air introducing pipe 6 is provided with a third air introducing pipe high-temperature butterfly valve 7, so that the air introducing proportion is convenient to be adjusted, the introduced air is used for generating enough heat with a small amount of pulverized coal for combustion, so that the gasification proportion of water gas in the water gas gasifier 1 is ensured, a stream of flue gas is introduced from the right side of a smoke chamber to enter a tangential inlet of a vortex mixing chamber 10 of the gasifier, a high-temperature butterfly valve 5 of the gasifier air-inducing pipe is arranged on an air-inducing pipe 4 of the gasifier, the proportion of the introduced flue gas is convenient to adjust, the wind speed in the air-inducing pipe 4 of the gasifier is 15m/s, the wind speed of the tangential inlet of the vortex mixing chamber 10 is more than or equal to 15m/s, the axial wind speed is 10m/s, the tangential wind and the axial wind form turbulence in the vortex mixing chamber, and under the action of the turbulence, the high-temperature steam, materials, pulverized coal, air and flue gas in the water gas gasifier 1 are uniformly mixed, and the limestone decomposition reaction and the main gasification reaction of the water gas are as follows:
C+O2=CO2
CaCO3=CaO+CO2↑
C+H2O=CO+H2
a uniform temperature field is formed in the water gas gasifier 1, the temperature is stably controlled at 1000-1200 ℃, the gasification efficiency of water gas is ensured, the phenomena of skinning and blockage caused by local high temperature in the water gas gasifier 1 are avoided, the residence time of various reactants in the water gas gasifier 1 is prolonged, the residence time of materials in the water gas gasifier 1 is about 3.5s, a stream of flue gas is introduced from the left side of a smoke chamber to enter a tangential inlet of a vortex mixing chamber 11 of the reduction furnace, a high-temperature butterfly valve 9 of a vortex mixing chamber of the reduction furnace is arranged on an air introducing pipe 8 of the reduction furnace, the proportion of the introduced flue gas is convenient to adjust, the vortex mixing chamber of the denitration reduction furnace 12 and the vortex mixing chamber of the water gas gasifier 1 are arranged in the opposite direction, the wind speed in the air introducing pipe 8 of the reduction furnace is 15m/s, the tangential inlet wind speed of the vortex mixing chamber 11 of the reduction furnace is more than or equal to 15m/s, the axial wind speed is 10m/s, the rest denitration reducing gas inlets are reserved on the vortex chamber, reducing gas generated by other systems can be introduced, tangential wind and axial wind form turbulence in the vortex chamber, under the action of the turbulence, the water gas and the flue gas from the water gas gasification furnace 1 are further mixed in the denitration reducing furnace 12, the reaction speed of the reducing gas and NOx in the water gas of the denitration reducing furnace 12 is accelerated, the residence time of the flue gas in the denitration reducing furnace 12 is prolonged, the residence time of the flue gas in the denitration reducing furnace 12 is about 3s, the reaction temperature of the flue gas in the denitration reducing furnace 12 is controlled between 900 ℃ and 1050 ℃, and the main reaction in the reduction furnace 12 is as follows:
2CO+2NO=2CO2+N2;
2H2+2NO=2H2O+N2;
The denitration rate in the denitration reduction furnace 12 can reach 100%, the tertiary air and the flue gas after denitration are all sent into the decomposition furnace 13, redundant water gas and tertiary air in the flue gas continue to burn in the decomposition furnace 13 for decomposing the raw materials sent by C4A and C4B, fuel nitrogen generated in the combustion of the decomposition furnace 13 and raw material nitrogen brought by the raw materials are introduced into the decomposition furnace 13 from the bottom to the top along with the flue gas in the decomposition furnace 13, the reducing gas is introduced into the top of the decomposition furnace 13, the reducing gas and NOx in the flue gas of the decomposition furnace 13 are subjected to denitration reduction reaction, unreacted NOx enters a C5 cylinder along with the flue gas, and the residual NOx is removed through an SNCR denitration system arranged on a top cover of the C5 cylinder, so that the NOx is ensured to reach the ultralow emission standard less than or equal to 50mg/Nm 3.
The present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the inventive concept thereof, can be replaced or changed within the scope of the present invention.
Claims (10)
1. An ultra-low emission device for water gas gasification, reduction denitration of a cement kiln comprises a water gas gasification furnace (1), and is characterized in that: the inlet of the water gas gasifier (1) is fixedly connected with a water vapor pipeline (2), the inlet of the water gas gasifier (1) is fixedly connected with a coal dust conveying pipeline (3), the front end of the water gas gasifier (1) is provided with a gasifier vortex mixing chamber (10), the inlet of the gasifier vortex mixing chamber (10) is fixedly connected with a gasifier induced-air pipe (4), the gasifier induced-air pipe (4) is provided with a gasifier induced-air pipe high-temperature butterfly valve (5), the surface of the water gas gasifier (1) is fixedly connected with a tertiary air induced-air pipe (6), the surface of the tertiary air induced-air pipe (6) is fixedly connected with a tertiary air induced-air pipe high-temperature butterfly valve (7), the outlet of the water gas gasification furnace (1) is fixedly connected with the inlet of the denitration reducing furnace (12), the front end of the denitration reducing furnace (12) is provided with a reducing furnace vortex mixing chamber (11), the inlet of the reducing furnace vortex mixing chamber (11) is fixedly connected with a reducing furnace air guiding pipe (8), the surface of the reducing furnace air guiding pipe (8) is fixedly connected with a reducing furnace air guiding pipe high temperature butterfly valve (9), the outlet of the denitration reducing furnace (12) is fixedly connected with the inlet of the decomposing furnace (13), the inlet of the decomposing furnace (13) is fixedly connected with a tertiary air pipe (15), the surface of the water gas gasifier (1) is fixedly connected with an SNCR denitration system (16).
2. An ultra-low emission device for water gas gasification, reduction denitration of a cement kiln according to claim 1, wherein: the smoke chamber is introduced into the high-temperature smoke through the gasifier air guide pipe (4) and is connected with the tangential inlet of the gasifier vortex mixing chamber (10), and the air quantity of the high-temperature smoke can be adjusted by the gasifier air guide pipe high-temperature butterfly valve (5) arranged on the surface of the gasifier air guide pipe (4).
3. An ultra-low emission device for water gas gasification, reduction denitration of a cement kiln according to claim 1, wherein: the vortex mixing chamber (10) of the gasifier adopts a volute type design, rotary-cut wind and axial wind are vertically arranged, uniform mixing of materials and smoke is guaranteed, a stable flow field is generated in the water gas gasifier (1), skinning can be prevented, and gasification efficiency of water gas is guaranteed.
4. An ultra-low emission device for water gas gasification, reduction denitration of a cement kiln according to claim 1, wherein: the reducing furnace vortex mixing chamber (11) and the gasifier vortex mixing chamber (10) are arranged in the opposite direction, a smoke is introduced from the right side of the smoke chamber and enters the reducing furnace flow mixing chamber (11), and water gas and smoke from the water gas gasifier (1) are further mixed in the reducing furnace vortex mixing chamber (11), so that the reaction speed of the water gas and NOx is accelerated.
5. An ultra-low emission device for water gas gasification, reduction denitration of a cement kiln according to claim 1, wherein: the vortex mixing chamber (11) of the reduction furnace adopts a volute type design, a reducing gas inlet is reserved on the volute, and rotary-cut wind and axial wind are vertically arranged.
6. An ultra-low emission device for water gas gasification, reduction denitration of a cement kiln according to claim 1, wherein: the gooseneck of the denitration reducing furnace (12) adopts an inclined plate design, so that dust accumulation at the gooseneck is prevented, and the resistance of the denitration reducing furnace (12) is reduced.
7. An ultra-low emission device for water gas gasification, reduction denitration of a cement kiln according to claim 1, wherein: the water gas gasification furnace (1) is an online vortex pipeline furnace, one end of the water gas gasification furnace is connected with the smoke chamber, the other end of the water gas gasification furnace is connected with the denitration reduction furnace (12), and water vapor, coal dust and raw meal are added from an inlet.
8. An ultra-low emission device for water gas gasification, reduction denitration of a cement kiln according to claim 1, wherein: the denitration reduction furnace (12) is an online vortex pipeline furnace, one end of the denitration reduction furnace is connected with the water gas gasification furnace (1), and the other end of the denitration reduction furnace is connected with the decomposing furnace (13).
9. An ultra-low emission device for water gas gasification, reduction denitration of a cement kiln according to claim 1, wherein: the top of the decomposing furnace (13) is provided with a reducing gas inlet for removing raw material nitrogen and generated thermal nitrogen in the decomposing furnace (13).
10. An ultra-low emission device for water gas gasification, reductive denitration of a cement kiln according to claim 1, wherein: the water gas gasifier (1) is connected with a tertiary air guiding pipe (6), and a tertiary air guiding pipe high-temperature butterfly valve (7) arranged on the tertiary air guiding pipe (6) is used as an adjusting device for adjusting the proportion of exhaust.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210992432.XA CN115287097B (en) | 2022-08-18 | 2022-08-18 | Ultra-low emission device for water gas gasification, reduction and denitration of cement kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210992432.XA CN115287097B (en) | 2022-08-18 | 2022-08-18 | Ultra-low emission device for water gas gasification, reduction and denitration of cement kiln |
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| Publication Number | Publication Date |
|---|---|
| CN115287097A CN115287097A (en) | 2022-11-04 |
| CN115287097B true CN115287097B (en) | 2024-06-07 |
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| JP2008018371A (en) * | 2006-07-14 | 2008-01-31 | Taiheiyo Cement Corp | Method for using organic waste |
| CN111256484A (en) * | 2020-03-17 | 2020-06-09 | 天瑞新登郑州水泥有限公司 | Cement kiln denitrification facility |
| WO2021019753A1 (en) * | 2019-08-01 | 2021-02-04 | 太平洋エンジニアリング株式会社 | Cement firing device and cement kiln exhaust gas denitrification method |
| CN112546833A (en) * | 2020-02-29 | 2021-03-26 | 天瑞集团光山水泥有限公司 | Ammonia-free denitration method and device for tail gas in cement kiln production |
| WO2021218074A1 (en) * | 2020-04-29 | 2021-11-04 | 华能国际电力股份有限公司 | Flue structure for sncr denitrification of flue gas from pulverized coal boiler and heating sludge-drying heat transfer oil |
| CN114562875A (en) * | 2022-01-24 | 2022-05-31 | 华新水泥股份有限公司 | Three-spraying double-rotary-cutting gradient combustion low-carbon low-nitrogen environment-friendly decomposing furnace for cement production |
| CN216644939U (en) * | 2022-01-11 | 2022-05-31 | 北京清新泓业环保科技有限公司 | Deep denitration system of dry cement production line |
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| JP2008018371A (en) * | 2006-07-14 | 2008-01-31 | Taiheiyo Cement Corp | Method for using organic waste |
| WO2021019753A1 (en) * | 2019-08-01 | 2021-02-04 | 太平洋エンジニアリング株式会社 | Cement firing device and cement kiln exhaust gas denitrification method |
| CN112546833A (en) * | 2020-02-29 | 2021-03-26 | 天瑞集团光山水泥有限公司 | Ammonia-free denitration method and device for tail gas in cement kiln production |
| CN111256484A (en) * | 2020-03-17 | 2020-06-09 | 天瑞新登郑州水泥有限公司 | Cement kiln denitrification facility |
| WO2021218074A1 (en) * | 2020-04-29 | 2021-11-04 | 华能国际电力股份有限公司 | Flue structure for sncr denitrification of flue gas from pulverized coal boiler and heating sludge-drying heat transfer oil |
| CN216644939U (en) * | 2022-01-11 | 2022-05-31 | 北京清新泓业环保科技有限公司 | Deep denitration system of dry cement production line |
| CN114562875A (en) * | 2022-01-24 | 2022-05-31 | 华新水泥股份有限公司 | Three-spraying double-rotary-cutting gradient combustion low-carbon low-nitrogen environment-friendly decomposing furnace for cement production |
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