CN111888914A - Novel combined denitration system of dry kiln - Google Patents

Novel combined denitration system of dry kiln Download PDF

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Publication number
CN111888914A
CN111888914A CN202010915294.6A CN202010915294A CN111888914A CN 111888914 A CN111888914 A CN 111888914A CN 202010915294 A CN202010915294 A CN 202010915294A CN 111888914 A CN111888914 A CN 111888914A
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furnace
low
kiln
denitration system
dry kiln
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Inventor
李嘉隆
赵迎朝
代家聚
牛华民
刘旭
潘玉峰
梁军伟
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Luoyang Building Materials & Architectural Design And Research Institute Co ltd
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Luoyang Building Materials & Architectural Design And Research Institute Co ltd
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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
    • B01D53/75—Multi-step processes
    • 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
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention relates to a combined denitration system of a novel dry kiln, which comprises a kiln tail smoke chamber, wherein the upper part of the kiln tail smoke chamber is connected with a low NOxReduction furnace of the low NOxThe lower part of the reduction furnace is of a Venturi tube structure, a coal powder feeding point is arranged at the throat of the Venturi tube, and an additional diffusion tube for controlling low NO is arranged on the side wall of the diffusion tube above the Venturi tubexA first material pipe for reducing the temperature in the furnace and preheating the material by a preheating device; the low NOxThe outlet of the reduction furnace is connected with the inlet of the decomposing furnace. The bottom of the reducing furnace adopts a Venturi tube structure, and the coal powder feeding point is arranged at the throat of the Venturi tube, so that the sprayed coal powder can be better dispersed and combusted, and sufficient reducing agent is provided for the reduction reaction in the reducing furnace.

Description

Novel combined denitration system of dry kiln
Technical Field
The invention relates to the field of environmental protection, in particular to a combined denitration system of a novel dry kiln.
Background
The fuel adopted by the domestic cement novel dry kiln is mainly coal, and the generated NOxMainly in the thermal type NOxAnd fuel type NOxMainly comprises the following steps. The temperature in the novel dry kiln is more than 1500 ℃ in the calcining process, and the high temperature state N is2In the presence of O2Oxidation reaction produces a large amount of thermal NOxThe reaction formula is as follows: n is a radical of2+O2→2NO；2NO+O2→2NO2. While the nitrogen compounds contained in the coal are being combusted to form fuel-type NOxThe reaction formula is as follows: HCN + NH3+CN+O2→NOx+H2O+CO2+ …. And NOxIs one of the main pollution sources causing air pollution, has toxic effect on human bodies and animals, forms acid rain and acid mist and forms photochemical smog with hydrocarbon, so that the nation has NO pollutionxEmission limits are becoming more stringent. According to the emission standard of atmospheric pollutants in the cement industry, which is implemented by various provinces, the cement enterprises need to achieve ultralow emission, wherein NO isxThe discharge should not be higher than 100mg/m3. The world-wide warfare requires NO in 2020xThe discharge amount is reduced by more than 15 percent compared with that of 2015, and part of excellent cement enterprises reduce NO in responsexThe emission index and the new requirement of establishing an environment-friendly marking post provide NOxThe discharge is not higher than 50mg/m3The requirements of (1). 5000t/d novel dry-process cement production line, NO at outlet of decomposing furnace under the condition of not adopting denitration technologyxThe content is 600mg/m3～950mg/m3In order to meet the emission standard, a denitration technology is required.
The current 5000t/d novel dry kiln commonly used denitration technology is SNCR and SCR. Both of these techniques have deficiencies. SNCR denitration technique namely selectivityThe non-catalytic reduction technology is to spray amino reducing agent into decomposing furnace to reduce NO at 850-1000 deg.cxReduction to N2And H2O, the problem of large ammonia injection amount and high operation cost. NO is required to be achieved in production of 5000t/d novel dry-process cement production linexThe discharge is not higher than 100mg/m3The standard of (1) is to inject 20% ammonia water of 1.2m3/h～ 1.5m3H, and the ammonia escape cannot be effectively controlled, wherein the ammonia escape is 15mg/m3Above, the national standard ammonia escape is less than 8mg/m3The requirements of (1). At present, the price of industrial ammonia water is about 800 yuan/ton, and the cost of clinker per ton averagely rises about 3 yuan/ton by taking 5000t/d novel dry-process cement production line production as an example.
SCR denitration technology, namely selective catalytic reduction technology, makes amino reducing agent preferentially react with NO under the action of catalystxReduction and removal reaction to generate N2And H2And O. Because of the high dust content of flue gas temperature among the novel dry process production line of 5000t/d is big, can lead to catalyst jam to become invalid, the catalyst front end needs to increase the electric dust collector and removes dust, and electric dust collector dust removal effect is unstable and system resistance increases, and the easy dust jam of catalyst is and the change expense is high.
Disclosure of Invention
In view of the above, it is desirable to develop a denitration process with low operation cost, deep denitration and effective ammonia escape control, and particularly to a combined denitration system and method for a novel dry kiln, which adds low NO between a decomposing furnace and a kiln tail smoke chamberxA reduction furnace for reducing NO in the flue gas discharged from the decomposition furnacexThe content of the ammonia water is greatly reduced, only the combination with the SNCR denitration technology is needed, and a small amount of ammonia water is sprayed into the decomposing furnace in an auxiliary way to greatly reduce NO in the novel dry kilnxDischarge of NOxThe discharge amount is less than 50mg/m3Is superior to the national standard, and can effectively control the ammonia escape to reach the national standard ammonia escape less than 8mg/m3The requirements of (1).
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The combined denitration system of the novel dry-method kiln comprises a kiln tail smoke chamberThe upper part of the kiln tail smoke chamber is connected with low NOxReduction furnace of the low NOxThe lower part of the reduction furnace is of a Venturi tube structure, a coal powder feeding point is arranged at the throat of the Venturi tube, and an additional diffusion tube for controlling low NO is arranged on the side wall of the diffusion tube above the Venturi tubexA first material pipe for reducing the temperature in the furnace and preheating the material by a preheating device; the low NOxThe outlet of the reduction furnace is connected with the inlet of the decomposing furnace.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
The combined denitration system of the novel dry kiln is characterized in that the low NO isxThe upper part of the reducing furnace is provided with a swirler, the lower part of the swirler is connected with a reducing flue, the reducing flue is connected with the side wall of a conical ash deposition hopper at the bottom of the decomposing furnace, and the conical ash deposition hopper is connected with a kiln tail smoke chamber through an ash return pipeline at the lower part of the conical ash deposition hopper.
The combined denitration system of the novel dry kiln is characterized in that the preheating device comprises two groups, each group of preheating device comprises a C4 suspension preheater for preheating materials and a C5 suspension preheater for carrying out gas-solid separation on mixed hot gas discharged from the top of the decomposing furnace and sending the separated solid into the tail gas chamber of the kiln, and the gas is sent into the C4 suspension preheater.
According to the combined denitration system of the novel dry kiln, the lower part of the decomposing furnace is sequentially provided with the coal powder feeding point and the tertiary air pipe from top to bottom.
In the combined denitration system of the novel dry kiln, the position of the lower part of the decomposing furnace, which is higher than the coal powder feeding point, is also connected with a material pipe for receiving the material preheated by the preheating device.
The combined denitration system of the novel dry kiln is low in NOxThe height of the reduction furnace is far greater than that of the decomposition furnace, and the position of the cyclone is also higher than the top of the decomposition furnace, so that the high-temperature flue gas at the kiln tail and the reducing agent have enough reaction time.
The combined denitration system of the novel dry kiln is low in NOxThe reduction furnace is connected with the cyclone through an inclined pipe of which the tail part of the upper end extends obliquely upwards.
The invention aims to solve the problem that China needs a denitration process capable of deeply denitrating and effectively controlling ammonia escape, and provides a combined denitration system of a novel dry kiln through reasonable design, wherein a small amount of ammonia water is sprayed in an auxiliary mode to greatly reduce NO of the novel dry kilnxDischarge of NOxThe discharge amount is less than 50mg/m3Is superior to the national standard, and can effectively control the ammonia escape to reach the national standard ammonia escape less than 8mg/m3The requirements of (1).
The bottom of the reducing furnace adopts a Venturi tube structure, and the coal powder feeding point is arranged at the throat of the Venturi tube, so that the sprayed coal powder can be better dispersed and combusted, and sufficient reducing agent is provided for the reduction reaction in the reducing furnace. And low NO in the present applicationxKiln tail high-temperature flue gas after reduction reaction of the reduction furnace sequentially passes through a swirler and a reduction flue, the swirler enables the kiln tail high-temperature flue gas to generate turbulence and increases the residence time of the kiln tail high-temperature flue gas, the reduction flue prolongs the path of the kiln tail high-temperature flue gas, and NO in the kiln tail high-temperature flue gas is ensuredxCan be fully reduced into N2And the like, and inert gas without pollution.
Drawings
FIG. 1 is a schematic diagram of the system components of the combined denitration system of the novel dry kiln.
[ description of main element symbols ]
1: kiln tail smoke chamber
2: low NOxReduction furnace
3: cyclone separator
4: reduction flue
5: conical ash deposition bucket
6: ash return pipe
7: decomposing furnace
8: C4A suspension preheater
9: C4B suspension preheater
10: C5A suspension preheater
11: C5B suspension preheater
12: material distributing valve
13: first material pipe
14: second material pipe
15: third material pipe
16: fourth material pipe
17: fifth material pipe
18: tertiary air pipe
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the predetermined objects, the following detailed description will be given to the combined denitration system of the novel dry kiln, its specific implementation, structure and effects thereof, in accordance with the present invention, with reference to the accompanying drawings and preferred embodiments.
Please refer to fig. 1, which is a schematic diagram of a combined denitration system of a novel dry kiln of the present invention, the system includes a kiln tail smoke chamber 1 and a low NO smoke chamberxA reduction furnace 2, a cyclone 3, a reduction flue 4, a decomposing furnace 7 and a preheating device, wherein the low NO isxThe reduction furnace 2 is arranged at the upper part of the kiln tail smoke chamber 1, and the low NO isxThe lower part of the reduction furnace 2 is of a Venturi tube structure, a coal powder feeding point is arranged at the throat of the Venturi tube, and the coal powder enters low NO from the feeding pointxIn the reduction furnace 2; the side wall of the diffusion pipe above the Venturi tube is provided with a device for adding the low NOxA first material pipe 13 for reducing the temperature of the material in the furnace 2 and a diffusion pipe below the Venturi tube are connected with the kiln tail smoke chamber 1. Low NOxThe upper part of the reducing furnace 2 is provided with a cyclone 3, the lower part of the cyclone 3 is connected with a reducing flue 4, the joint of the reducing flue 4 and the decomposing furnace 7 is provided with a conical ash deposition hopper 5, and the lower part of the conical ash deposition hopper 5 is provided with an ash return pipeline 6 connected with the kiln tail smoke chamber 1.
In the embodiment of the invention, the reduction flue 4 is connected to the side wall of the cone-shaped ash deposition hopper 5 through a tail bent pipe thereof. The flue gas in the reduction flue 4 enters from one side of the conical ash deposition hopper 5, and the flue gas inlet is higher than the ash deposition outlet connected with the conical ash deposition hopper 5 and the ash return pipeline 6, so that the deposited ash is conveniently discharged.
The preheating device comprises two groups which are respectively positioned at two sides of the decomposing furnace 7, and each group of preheating device comprises a C4 suspension preheater for heating materials and a C5 suspension preheater for carrying out gas-solid separation on the materials discharged along with the smoke. Wherein, the C4 suspension preheater includes C4A suspension preheater 8 and C4B suspension preheater 9, and the C5 suspension preheater includes C5A suspension preheater 10 and C5B suspension preheater 11.
The lower part of the decomposing furnace 7 is connected with a tertiary air pipe 18, and the lower part of the decomposing furnace 7 is also connected with a second material pipe 14 for conveying the materials preheated by the C4A suspension preheater 8, a third material pipe 15 for conveying the materials preheated by the C4B suspension preheater 9 and a coal powder feeding point. In the embodiment of the invention, the height of the coal powder feeding point is higher than that of the tertiary air pipe.
The mixed hot air ascending pipeline arranged at the top of the decomposing furnace 7 is respectively connected with one side of the C5A suspension preheater 10 and one side of the C5B suspension preheater 11, so that the hot materials decomposed in the decomposing furnace enter the C5 suspension preheater along with the flue gas, and the C5A suspension preheater 10 and the C5B suspension preheater 11 respectively send the separated hot materials into the kiln tail smoke chamber 1 through the fifth material pipe 16 and the sixth material pipe 17.
In the embodiment of the invention, the outlet direction of the cyclone 3 and low NOxThe gas in the reduction furnace 2 rises in the opposite direction and the low NO is generatedxThe portion of the reduction furnace 2 connected to the cyclone 3 is an inclined tube extending obliquely upward, i.e., the low NOxThe reduction furnace 2 is connected with the cyclone after being bent by more than ninety degrees at the tail part, and the resistance of gas circulation in the reduction furnace can be effectively reduced by bending at a large angle.
In production, at low NOxCoal powder is added into the throat of the reduction furnace 2, and the kiln tail flue gas carries the coal powder in low NOxThe reduction furnace 2 is fully mixed and combusted, the oxygen content of the kiln tail waste gas is very low, and the coal powder is subjected to pyrolysis and gasification reaction during oxygen-deficient combustion, and the main reaction formula is as follows: c + CO2→ 2CO, H2、CH4And reducing agents such as HCN and fixed carbon. These reducing agents react with NO in the kiln tail flue gasxAt low NOxReaction takes place in the reduction furnace 2 to convert NOxReduction to N2And the like, and inert gas without pollution. The reaction formula is as follows: CO + H2+CH4+HCN+NOx→N2+CO2+H2And O …. And the coal powder is burnt under the anoxic condition to inhibit the self-fuel NOxAnd (4) generating.
Low NOxThe temperature in the reduction furnace 2 can not exceed 1100 ℃, if the temperature exceeds 1100 ℃, new high-temperature NO can be formed at high temperaturexResulting in poor denitration effect and thus low NOxA first material pipe 13 from a C4A suspension preheater 8 is arranged on the side wall of a venturi tube diffusion pipe at the lower part of the reduction furnace 2, the temperature of the material from the C4A suspension preheater 8 is 750-780 ℃, and the low-temperature material enters low NOxThe reduction furnace 2 absorbs heat rapidly, and CaCO is decomposed by materials3→CaO+CO2Also can absorb a large amount of heat, thereby ensuring low NOxThe temperature of the reduction furnace 2 is 1100 ℃. In the embodiment of the invention, the lower part of the C4A suspension preheater 8 is provided with a material distribution valve 12 for controlling the material amount in the first material pipe 13 and the second material pipe 14, and the material entering the first material pipe 13 from the material distribution valve is finally sent to low NOxThe material entering the second material pipe 14 from the material distributing valve is sent into the decomposing furnace for decomposition in the reducing furnace 2 for controlling the internal temperature.
In the examples of the present invention, the low NOxThe height of the reduction furnace 2 is far greater than that of the decomposing furnace, and the position of the swirler is also higher than the top of the decomposing furnace, so that the high-temperature flue gas at the kiln tail and the reducing agent have enough reaction time, the reduction reaction is fully carried out, and the residual NO in the flue gas isxThe amount of (A) is greatly reduced.
Kiln tail high-temperature flue gas and materials which are subjected to full reduction reaction enter a decomposing furnace 7 through a reduction flue 4 and a conical ash deposition hopper 5, a tertiary air pipeline 18 and a coal powder feeding point are arranged at the lower part of the decomposing furnace 7, the materials from a C4A suspension preheater 8 and a C4B suspension preheater 9 enter the decomposing furnace 7 through a second material pipe 14 and a third material pipe 15, the material decomposition is mainly carried out in the decomposing furnace, the temperature in the decomposing furnace 7 is controlled to be 850-900 ℃, and the main reaction formula is as follows: CaCO3→CaO+CO2. NO at the outlet of the decomposing furnacexThe content is 200mg/m3～300mg/m3Auxiliary spraying of 0.3m ammonia water with 20% concentration3/h～ 0.5m3H, can make NOxThe discharge amount is less than 50mg/m3And can effectively control ammonia escape to reach the national standard of less than 8mg/m3The requirements of (1).
The material decomposed by the decomposing furnace 7 is carried by flue gas, and is sent to the C5A suspension preheater 10 and the C5B suspension preheater 11 through a hot ascending air flow pipeline arranged at the top of the decomposing furnace 7, the material after gas-solid separation enters the kiln tail smoke chamber 1 through the fourth material pipe 16 and the fifth material pipe 17, enters the kiln for calcination, and the flue gas enters the C4A suspension preheater 8 and the C4B suspension preheater 9 through the hot ascending mixed air flow pipeline of the C5A suspension preheater 10 and the C5B suspension preheater 11.
The combined denitration system of the novel dry kiln can greatly reduce NO of the novel dry kilnxDischarge amount of NO at the outlet of the decomposing furnacexThe content is 600mg/m3～950mg/m3Down to 200mg/m3～ 300mg/m3Auxiliary spraying of 0.3m ammonia water with 20% concentration3/h～0.5m3H, i.e. can make NOxThe discharge amount is less than 50mg/m3And can effectively control ammonia escape to reach the national standard of less than 8mg/m3The using amount of the ammonia water is only 1/3 of the SNCR denitration technology, the cost of clinker per ton is reduced by more than 2 yuan per ton compared with the SNCR denitration technology, and the operation cost is far lower than that of the SCR denitration technology. The invention can be used for the reconstruction project of the novel dry kiln and the new project of the novel dry kiln.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

1. The utility model provides a novel combined type denitration system of dry kiln which characterized in that: comprises a kiln tail smoke chamber, the upper part of the kiln tail smoke chamber is connected with low NOxReduction furnace of the low NOxThe lower part of the reduction furnace is of a Venturi tube structure, and the throat of the Venturi tube isIs provided with a coal powder feeding point, and a diffusion tube arranged above the Venturi tube and used for adding and controlling low NOxA first material pipe for reducing the temperature in the furnace and preheating the material by a preheating device; the low NOxThe outlet of the reduction furnace is connected with the inlet of the decomposing furnace.
2. The combined denitration system of the novel dry kiln as set forth in claim 1, wherein: wherein said low NOxThe upper part of the reducing furnace is provided with a swirler, the lower part of the swirler is connected with a reducing flue, the reducing flue is connected with the side wall of a conical ash deposition hopper at the bottom of the decomposing furnace, and the conical ash deposition hopper is connected with a kiln tail smoke chamber through an ash return pipeline at the lower part of the conical ash deposition hopper.
3. The combined denitration system of the novel dry kiln as set forth in claim 1, wherein: the preheating device comprises two groups, wherein each group of preheating device comprises a C4 suspension preheater for preheating materials and a C5 suspension preheater for carrying out gas-solid separation on mixed hot gas discharged from the top of the decomposing furnace, conveying the separated solid into a kiln tail smoke chamber and conveying the gas into a C4 suspension preheater.
4. The combined denitration system of the novel dry kiln according to claim 3, characterized in that: the lower part of the decomposing furnace is sequentially provided with a coal powder feeding point and a tertiary air pipe from top to bottom.
5. The combined denitration system of the novel dry kiln according to claim 4, characterized in that: the lower part of the decomposing furnace is higher than the coal powder feeding point and is also connected with a material pipe for receiving the materials preheated by the preheating device.
6. The combined denitration system of the novel dry kiln as set forth in claim 2, wherein: said low NOxThe height of the reduction furnace is far greater than that of the decomposition furnace, and the position of the cyclone is also higher than the top of the decomposition furnace, so that the high-temperature flue gas at the kiln tail and the reducing agent have enough reaction time.
7. The combined denitration system of the novel dry kiln as set forth in claim 2, wherein: said low NOxThe reduction furnace is connected with the cyclone through an inclined pipe of which the tail part of the upper end extends obliquely upwards.
CN202010915294.6A 2020-09-03 2020-09-03 Novel combined denitration system of dry kiln Pending CN111888914A (en)

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Application Number Priority Date Filing Date Title
CN202010915294.6A CN111888914A (en) 2020-09-03 2020-09-03 Novel combined denitration system of dry kiln

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CN111888914A true CN111888914A (en) 2020-11-06

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