CN112058064A - Circulating spouting NOx emission reduction system and working method thereof - Google Patents
Circulating spouting NOx emission reduction system and working method thereof Download PDFInfo
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- 230000009467 reduction Effects 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000779 smoke Substances 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 28
- 239000000446 fuel Substances 0.000 claims abstract description 27
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 13
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims description 21
- 239000003546 flue gas Substances 0.000 claims description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000000354 decomposition reaction Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 125000004122 cyclic group Chemical group 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 4
- 238000002309 gasification Methods 0.000 claims description 4
- 238000000197 pyrolysis Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 abstract description 5
- 238000006722 reduction reaction Methods 0.000 description 17
- 238000005516 engineering process Methods 0.000 description 9
- 239000003054 catalyst Substances 0.000 description 6
- 238000010531 catalytic reduction reaction Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 235000012054 meals Nutrition 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- 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
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- 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
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a circulating spouting NOx emission reduction system and a working method thereof, wherein the circulating spouting NOx emission reduction system comprises a rotary kiln, a smoke chamber, a spouting ring, a fuel system, a tertiary air pipe, a reactor, a first distributing valve, a first cyclone, a denitration system, a decomposing furnace, a hopper and a second cyclone; the air inlet of the smoke chamber is connected with the air outlet of the rotary kiln, the air outlet of the reactor is connected to one side of the decomposing furnace and is communicated with the interior of the decomposing furnace, and the air inlet of the reactor is connected with the air outlet of the smoke chamber through a spouting ring; the air outlet of the tertiary air pipe is connected to the bottom of the decomposing furnace, the feed inlet of the hopper is connected below the air outlet of the tertiary air pipe, and the air inlet of the second cyclone is connected with the air outlet of the decomposing furnace; the invention effectively avoids or reducesNOXThereby increasing NOXThe emission reduction efficiency is improved, and the ammonia water consumption of the denitration system is greatly reduced so as to save the production cost; meanwhile, the problem of serious material accumulation at the bottom of the decomposing furnace is solved, and secondary pollution is avoided.
Description
Technical Field
The invention relates to a circulating spouting NOx emission reduction system and a working method thereof.
Background
At present, the environmental pollution problem is increasingly serious, the requirements of various industries on environmental protection indexes are more strict, and partial provinces and cities have brought forward the ultra-low emission requirement to remove NO in flue gasXThe emission is controlled below 50mg/Nm 3.
NO currently adopted by cement manufacturing enterprisesXThe emission reduction technology mainly comprises the following steps: selective non-catalytic reduction (SNCR) technology, Selective Catalytic Reduction (SCR) technology, and staged combustion technology.
The selective non-catalytic reduction (SNCR) technique is characterized by that the ammonia water solution is passed through pump station and spray gun and sprayed into proper positions of decomposing furnace and preheater to make NO be passed throughXReduction to N2And H2O, thereby realizing NOXEmission reduction; the technology has the main problems that the denitration efficiency is greatly influenced by temperature, the overall efficiency is low, temperature fluctuation in a kiln can occur during production of cement enterprises, the temperature of the spraying position of ammonia water can deviate from the optimal reaction temperature, the ammonia water consumption can only be increased to ensure the discharge index of an outlet, the cement production cost is greatly increased, and a large amount of ammonia can escape to cause secondary pollution; meanwhile, the overall efficiency of the technology is generally about 60%, and ultralow emission cannot be realized.
The Selective Catalytic Reduction (SCR) technique is characterized by that the fume is introduced into reactor (containing catalyst), and the ammonia water solution is sprayed into proper position of connecting pipeline, and under the action of a certain temp. and catalyst the NO is introduced into the reactorXReduction to N2And H2O, thereby realizing NOXEmission reduction; the main problems of the technology are high investment cost and high later-period use costThe denitration efficiency is influenced by temperature and dust concentration greatly, cement enterprise's exhanst gas outlet temperature is lower, the common scheme is to arrange the reactor between dore furnace and exhaust-heat boiler, and here temperature satisfies catalyst operation requirement, but dust concentration is higher, very easily causes catalyst hole to block up, uses later stage denitration efficiency to reduce by a wide margin, needs the periodic replacement catalyst, use cost is high, and simultaneously, ageing catalyst is dangerous discarded object, and is extremely difficult to handle, causes secondary pollution.
A common scheme of staged combustion technology is to add a section of pipeline (reactor) between the smoke chamber of rotary kiln and decomposing furnace, to connect the tertiary air from the side of kiln head into the pipeline, and at the same time, to connect raw material and fuel at proper positions, and to utilize the "Budoaer" reaction to react CO2Reducing to CO or generating CO and C by using fuel pyrolysis and gasificationXHyReducing gas like, and then generating NO at high temperature in the rotary kilnXReduction to N2And CO2Thereby realizing NOXEmission reduction; the main problems of the technology are that the material accumulation phenomenon at the bottom of the decomposing furnace is serious, the load of the rotary kiln can be increased after the accumulated material enters the rotary kiln, the output and the quality of clinker are reduced, and the normal production is greatly influenced.
Disclosure of Invention
In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a method for effectively avoiding or reducing NOXTo increase NOXThe emission reduction efficiency is improved, the ammonia water consumption of the denitration system is greatly reduced so as to save the production cost, the problem of serious material accumulation at the bottom of the decomposing furnace is solved, and secondary pollution is avoided.
The technical scheme adopted by the invention for solving the technical problems is as follows: a cyclic spouting NOx emission reduction system is characterized in that: the device comprises a rotary kiln, a smoke chamber, a spouting ring, a fuel system, a tertiary air pipe, a reactor, a first distributing valve, a first cyclone, a denitration system, a decomposing furnace, a hopper and a second cyclone; the air inlet of the smoke chamber is connected with the air outlet of the rotary kiln, the air outlet of the reactor is connected to one side of the decomposing furnace and is communicated with the interior of the decomposing furnace, and the air inlet of the reactor is connected with the air outlet of the smoke chamber through a spouting ring; the air outlet of the tertiary air pipe is connected to the bottom of the decomposing furnace, the feed inlet of the hopper is connected to the lower portion of the air outlet of the tertiary air pipe, the air inlet of the second cyclone is connected with the air outlet of the decomposing furnace, the air outlet of the second cyclone is connected with the air inlet of the first cyclone, the discharge outlet of the first cyclone is connected with the feed inlet of the first distributing valve, one discharge outlet of the first distributing valve is connected to one side of the decomposing furnace and communicated with the inside of the decomposing furnace, the other discharge outlet of the first distributing valve is communicated with the feed inlet of the reactor, and the discharge outlet of the second cyclone is connected to one side of the smoke chamber and communicated with the inside of the smoke chamber; a denitration system is arranged at the air outlet of the second cyclone and the air outlet of the decomposing furnace; one or more first fuel pipelines are also arranged in the feed inlet of the reactor, and one or more second fuel pipelines are also arranged in the decomposing furnace; one or more second fuel pipelines are arranged above the air outlet of the reactor.
Preferably, a bent section is formed at an air outlet of the reactor, and the end part of the bent section is obliquely and downwards connected to one side of the decomposing furnace and is communicated with the inside of the decomposing furnace.
Preferably, the device also comprises a second material distributing valve, a feeding hole of the second material distributing valve is connected with a discharging hole of the hopper, one discharging hole of the second material distributing valve is communicated with the feeding hole of the reactor and is arranged above the spouting ring, and the other discharging hole of the second material distributing valve is connected with a discharging hole of the second cyclone in parallel and then is connected to one side of the smoke chamber and is communicated with the inside of the smoke chamber.
A working method of a circulating spouting NOx emission reduction system is characterized by comprising the following steps: the method comprises the following steps:
(1) the flue gas generated in the rotary kiln enters a reactor through a smoke chamber and a spouting ring, fuel is fed into a feed port of the reactor through one or more first fuel pipelines and is combusted, and then a strong reducing atmosphere is formed in the reactor through a 'Braudoual' reaction and a pyrolysis gasification reaction so as to pass throughControlling the residence time of the flue gas in the reactor to reduce NOX。
(2) The first cyclone feeds part of raw material into the inlet of the reactor through the first material dividing valve according to the temperature change in the reactor to avoid the formation of local high temperature in the reactor, thereby avoiding or reducing NO in the reactorXIs performed.
(3) Introducing tertiary air into the tertiary air pipe, mixing the tertiary air with hot air in the reactor to generate high-speed flowing air under the action of the tertiary air pipe, introducing the air into the bottom of the decomposing furnace, and allowing the air to flow from bottom to top, introducing fuel into the decomposing furnace by means of one or more second fuel pipelines to supply heat for combustion, and fully preheating and decomposing the raw material fed into the decomposing furnace by the first cyclone cylinder, thereby reducing NO in the decomposing furnaceXIs performed.
(4) The denitration system sprays the ammonia water solution to the air outlets of the decomposing furnace and the second cyclone to reduce NO againXThe flue gas output from the air outlet of the decomposing furnace enters the second cyclone to separate powder of the flue gas, the separated flue gas enters the first cyclone to be separated for the second time, and the separated powder returns to the smoke chamber through the discharge hole of the second cyclone.
(5) The high-speed flowing air introduced into the bottom of the decomposing furnace through the air outlet of the tertiary air pipe can fully lift the accumulated materials at the bottom of the decomposing furnace, a small part of raw materials enter the hopper through the pipe wall of the tertiary air pipe, and the raw materials in the hopper are directly discharged outwards.
(6) If the discharge ports of the hopper are provided with the second material distributing valve, when the decomposition rate does not meet the requirement, the raw materials in the hopper are fed into the feed port of the reactor through one discharge port of the second material distributing valve and are positioned above the spouting ring, and then are circularly decomposed again by means of the reactor and the decomposing furnace; if the decomposition rate meets the requirement, the raw material in the hopper is fed into the smoke chamber through the other discharge hole of the second material distributing valve, and finally enters the rotary kiln without influencing the normal production of the rotary kiln.
Compared with the prior art, the invention has the advantages that: the invention forms strong reducing atmosphere in the reactor and uses the decomposing furnace and the second cyclone cylinderThe air outlet is internally provided with a denitration system for spraying ammonia solution so as to reduce NO in the flue gasXMeanwhile, the temperature in the reactor and the decomposing furnace is regulated and controlled, so that NO is effectively avoided or reducedXThereby increasing NOXThe emission reduction efficiency is improved, and the ammonia water consumption of the denitration system is greatly reduced so as to save the production cost; meanwhile, the invention solves the problem of serious material accumulation at the bottom of the decomposing furnace by the aid of the tertiary air pipe, and feeds a small part of raw materials into the reactor and the decomposing furnace for spouting circulation, and the raw materials are fed into a smoke chamber after the decomposition rate reaches the standard, so that the influence on the normal production of the rotary kiln is eliminated, and secondary pollution is avoided.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic diagram of the connection of a second dispensing valve of the present invention.
Detailed Description
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.
As shown in fig. 1, a cyclic spouting NOx emission reduction system includes a rotary kiln 1, a smoke chamber 2, a spouting ring 3, a fuel system 4, a tertiary air duct 5, a reactor 6, a first distribution valve 7, a first cyclone 8, a denitration system 9, a decomposing furnace 10, a hopper 11, and a second cyclone 12; an air inlet of the smoke chamber 2 is connected with an air outlet of the rotary kiln 1, an air outlet of the reactor 6 is connected to one side of the decomposing furnace 10 and is communicated with the inside of the decomposing furnace 10, and an air inlet of the reactor 6 is connected with an air outlet of the smoke chamber 2 through the spouting ring 3; an air outlet of the tertiary air pipe 5 is connected to the bottom of the decomposing furnace 10, a feed inlet of a hopper 11 is connected below the air outlet of the tertiary air pipe 5, an air inlet of a second cyclone 12 is connected with the air outlet of the decomposing furnace 10, an air outlet of the second cyclone 12 is connected with an air inlet of a first cyclone 8, a discharge outlet of the first cyclone 8 is connected with a feed inlet of a first distributing valve 7, one discharge outlet of the first distributing valve 7 is connected to one side of the decomposing furnace 10 and communicated with the inside of the decomposing furnace 10, the other discharge outlet of the first distributing valve 7 is communicated with a feed inlet of a reactor 6, and a discharge outlet of the second cyclone 12 is connected to one side of the smoke chamber 2 and communicated with the inside of the smoke chamber 2; the air outlets of the second cyclone 12 and the decomposing furnace 10 are respectively provided with a denitration system 9; one or more first fuel pipelines 41 are also arranged in the feed inlet of the reactor 6, and one or more second fuel pipelines 42 are also arranged inside the decomposing furnace 10; one or more second fuel conduits 42 are provided above the outlet of the reactor 6.
A bending section 61 is formed at the air outlet of the reactor 6, and the end part of the bending section 61 is obliquely and downwards connected to one side of the decomposing furnace 10 and is communicated with the inside of the decomposing furnace 10.
As shown in fig. 2, the circulating spouting NOx emission reduction system further includes a second distribution valve 13, a feed port of the second distribution valve 13 is connected to a discharge port of the hopper 11, one discharge port of the second distribution valve 13 is communicated with a feed port of the reactor 6 and is disposed above the spouting ring 3, and the other discharge port of the second distribution valve 13 is connected in parallel with a discharge port of the second cyclone 12 and is connected to one side of the smoke chamber 2 and communicated with the inside of the smoke chamber 2.
A working method of a circulating spouting NOx emission reduction system comprises the following steps:
(1) the flue gas generated in the rotary kiln 1 enters through the smoke chamber 2 and the spouting ring 3Into the reactor 6, fuel is fed into the inlet of the reactor 6 by means of one or more first fuel pipes 41 and combusted, whereby a strongly reducing atmosphere is formed in the reactor 6 by means of the "Braudoal" reaction and the pyrolysis gasification reaction, whereby NO is reduced by controlling the residence time of the flue gas in the reactor 6X。
(2) The first cyclone 8 feeds part of the raw meal to the inlet of the reactor 6 through the first distributing valve 7 according to the temperature change in the reactor 6 to avoid the formation of local high temperature in the reactor 6, thereby avoiding or reducing NO in the reactor 6XIs performed.
(3) Introducing tertiary air into the tertiary air pipe 5, generating high-speed flowing air under the action of the tertiary air pipe 5, mixing the air with hot air in the reactor 6, introducing the air into the bottom of the decomposing furnace 10, flowing from bottom to top, introducing fuel into the decomposing furnace 10 by virtue of one or more second fuel pipelines 42 for combustion and heat supply, and fully preheating and decomposing the raw material fed into the decomposing furnace 10 by the first cyclone 8, thereby reducing NO in the decomposing furnace 10XIs performed.
(4) The denitration system 9 sprays the ammonia water solution to the air outlets of the decomposing furnace 10 and the second cyclone 12 to reduce NO againXThe flue gas output from the air outlet of the decomposing furnace 10 enters the second cyclone 12 to separate the powder of the flue gas, the separated flue gas enters the first cyclone 8 to be separated for the second time, and the separated powder returns to the smoke chamber 2 through the discharge hole of the second cyclone 12.
(5) The high-speed flowing air introduced into the bottom of the decomposing furnace 10 through the air outlet of the tertiary air duct 5 can fully lift the accumulated materials at the bottom of the decomposing furnace 10, a small part of raw materials enter the hopper 11 through the wall of the tertiary air duct 5, and the raw materials in the hopper 11 are directly discharged outwards.
(6) If the discharge ports of the hopper 11 are provided with the second material distributing valve 13, when the decomposition rate does not meet the requirement, the raw meal in the hopper 11 is fed into the feed port of the reactor 6 through one of the discharge ports of the second material distributing valve 13 and is positioned above the spouting ring 3, and is further circularly decomposed again by the reactor 6 and the decomposing furnace 10; if the decomposition rate meets the requirement, the raw material in the hopper 11 is fed into the smoke chamber 2 through the other discharge hole of the second material distributing valve 13, and finally enters the rotary kiln 1, and the normal production of the rotary kiln is not influenced.
The invention forms strong reducing atmosphere in the reactor 6, and arranges the denitration system 9 in the air outlets of the decomposing furnace 10 and the second cyclone 12 to spray ammonia water solution, thereby reducing NO in the flue gasXWhile effectively avoiding or reducing NO by regulating the temperature in the reactor 6 and the decomposing furnace 10XThereby increasing NOXThe emission reduction efficiency is improved, and the ammonia water consumption of the denitration system 9 is greatly reduced so as to save the production cost; meanwhile, the invention solves the problem of serious material accumulation at the bottom of the decomposing furnace 10 by the tertiary air pipe 5, and feeds a small part of raw materials into the reactor 6 and the decomposing furnace 10 for spouting circulation, and feeds the raw materials into the smoke chamber 2 after the decomposition rate reaches the standard, thereby eliminating the influence on the normal production of the rotary kiln 1 and not causing secondary pollution.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A cyclic spouting NOx emission reduction system is characterized in that: the device comprises a rotary kiln, a smoke chamber, a spouting ring, a fuel system, a tertiary air pipe, a reactor, a first distributing valve, a first cyclone, a denitration system, a decomposing furnace, a hopper and a second cyclone; the air inlet of the smoke chamber is connected with the air outlet of the rotary kiln, the air outlet of the reactor is connected to one side of the decomposing furnace and is communicated with the interior of the decomposing furnace, and the air inlet of the reactor is connected with the air outlet of the smoke chamber through a spouting ring; the air outlet of the tertiary air pipe is connected to the bottom of the decomposing furnace, the feed inlet of the hopper is connected to the lower portion of the air outlet of the tertiary air pipe, the air inlet of the second cyclone is connected with the air outlet of the decomposing furnace, the air outlet of the second cyclone is connected with the air inlet of the first cyclone, the discharge outlet of the first cyclone is connected with the feed inlet of the first distributing valve, one discharge outlet of the first distributing valve is connected to one side of the decomposing furnace and communicated with the inside of the decomposing furnace, the other discharge outlet of the first distributing valve is communicated with the feed inlet of the reactor, and the discharge outlet of the second cyclone is connected to one side of the smoke chamber and communicated with the inside of the smoke chamber; a denitration system is arranged at the air outlet of the second cyclone and the air outlet of the decomposing furnace; one or more first fuel pipelines are also arranged in the feed inlet of the reactor, and one or more second fuel pipelines are also arranged in the decomposing furnace; one or more second fuel pipelines are arranged above the air outlet of the reactor.
2. The cyclic spouting NOx abatement system of claim 1, wherein: the air outlet of the reactor is provided with a bending section, and the end part of the bending section is obliquely and downwards connected to one side of the decomposing furnace and is mutually communicated with the inside of the decomposing furnace.
3. The cyclic spouting NOx abatement system of claim 1, wherein: the device is characterized by further comprising a second material distributing valve, a feeding hole of the second material distributing valve is connected with a discharging hole of the hopper, one discharging hole of the second material distributing valve is communicated with the feeding hole of the reactor and is arranged above the spouting ring, and the other discharging hole of the second material distributing valve is connected with a discharging hole of the second cyclone in parallel and then is connected to one side of the smoke chamber and is communicated with the inside of the smoke chamber.
4. A working method of a circulating spouting NOx emission reduction system is characterized by comprising the following steps: the method comprises the following steps:
(1) the flue gas generated in the rotary kiln enters the reactor through the smoke chamber and the spouting ring, the fuel is fed into a feed port of the reactor by one or more first fuel pipelines and is combusted, and then the 'Dudaer' reaction and the pyrolysis gasification reaction are utilized, and the reaction is carried outAn intense reducing atmosphere is formed in the reactor, so that NO is reduced by controlling the residence time of flue gas in the reactorX。
(2) The first cyclone feeds part of raw material into the inlet of the reactor through the first material dividing valve according to the temperature change in the reactor to avoid the formation of local high temperature in the reactor, thereby avoiding or reducing NO in the reactorXIs performed.
(3) Introducing tertiary air into the tertiary air pipe, mixing the tertiary air with hot air in the reactor to generate high-speed flowing air under the action of the tertiary air pipe, introducing the air into the bottom of the decomposing furnace, and allowing the air to flow from bottom to top, introducing fuel into the decomposing furnace by means of one or more second fuel pipelines to supply heat for combustion, and fully preheating and decomposing the raw material fed into the decomposing furnace by the first cyclone cylinder, thereby reducing NO in the decomposing furnaceXIs performed.
(4) The denitration system sprays the ammonia water solution to the air outlets of the decomposing furnace and the second cyclone to reduce NO againXThe flue gas output from the air outlet of the decomposing furnace enters the second cyclone to separate powder of the flue gas, the separated flue gas enters the first cyclone to be separated for the second time, and the separated powder returns to the smoke chamber through the discharge hole of the second cyclone.
(5) The high-speed flowing air introduced into the bottom of the decomposing furnace through the air outlet of the tertiary air pipe can fully lift the accumulated materials at the bottom of the decomposing furnace, a small part of raw materials enter the hopper through the pipe wall of the tertiary air pipe, and the raw materials in the hopper are directly discharged outwards.
(6) If the discharge ports of the hopper are provided with the second material distributing valve, when the decomposition rate does not meet the requirement, the raw materials in the hopper are fed into the feed port of the reactor through one discharge port of the second material distributing valve and are positioned above the spouting ring, and then are circularly decomposed again by means of the reactor and the decomposing furnace; if the decomposition rate meets the requirement, the raw material in the hopper is fed into the smoke chamber through the other discharge hole of the second material distributing valve, and finally enters the rotary kiln without influencing the normal production of the rotary kiln.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011012931.5A CN112058064A (en) | 2020-09-23 | 2020-09-23 | Circulating spouting NOx emission reduction system and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011012931.5A CN112058064A (en) | 2020-09-23 | 2020-09-23 | Circulating spouting NOx emission reduction system and working method thereof |
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| CN113289480A (en) * | 2021-05-13 | 2021-08-24 | 天津中材工程研究中心有限公司 | Cement kiln predecomposition system for SNCR denitration optimization |
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