CN110694461A - High-reliability high-polymer selective denitration system and denitration process - Google Patents
High-reliability high-polymer selective denitration system and denitration process Download PDFInfo
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- 229920000642 polymer Polymers 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000003860 storage Methods 0.000 claims abstract description 82
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 76
- 239000000463 material Substances 0.000 claims abstract description 56
- 238000002347 injection Methods 0.000 claims abstract description 28
- 239000007924 injection Substances 0.000 claims abstract description 28
- 230000029058 respiratory gaseous exchange Effects 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 238000010926 purge Methods 0.000 claims description 43
- 238000005303 weighing Methods 0.000 claims description 23
- 239000000843 powder Substances 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 11
- 239000002918 waste heat Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 239000000428 dust Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002861 polymer material Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000004056 waste incineration Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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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
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- 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
- B01D53/346—Controlling the process
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
- F23C1/12—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air gaseous and pulverulent fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
-
- 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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- Environmental & Geological Engineering (AREA)
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- Biomedical Technology (AREA)
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- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
The invention discloses a high-reliability high-polymer selective denitration system which comprises a high-polymer denitration agent storage system, a high-polymer denitration agent buffer conveying system, an air supply system, a gas-material mixer and an injection system, wherein the bottom of a storage bin pipe is communicated with the top of a buffer hopper through a discharging pipe, the buffer hopper and a storage bin tank are both sealed structures and are respectively provided with a stirring mechanism, the upper part of the buffer hopper at one end of a breathing pipe is communicated, and the other end of the breathing pipe is communicated with the upper part of the storage bin pipe. Correspondingly, the invention also discloses a denitration process adopting the system. The system can realize an intelligent and automatic denitration process. The system has the characteristics of high denitration agent storage reliability and smooth blanking.
Description
Technical Field
The invention relates to the technical field of denitration, in particular to a high-reliability high-polymer selective denitration system and a high-reliability high-polymer selective denitration process.
Background
The flue gas denitration aims at removing nitrogen oxides in the flue gas and enabling the concentration of the nitrogen oxides to meet the national emission standard. The SNCR denitration process conventionally used in the waste incineration power generation industry has low denitration efficiency and can not meet the emission requirement of nitrogen oxide concentration gradually. For the SCR denitration process waste incineration power generation industry, due to the reasons of smoke components, process characteristics and the like, the smoke temperature of an SCR inlet needs to be increased, and the catalyst is easy to pollute, so that the operation cost of the SCR denitration technology is high. The national environmental protection index of the garbage industry is inevitably improved, so that a simple and practical flue gas denitration process with low operation cost is needed.
The polymer denitration agent is solid powder, is one of the keys of the whole polymer selective denitration technology (PSR denitration technology for short), and is prepared by polymerizing and loading amino components on a polymer material by taking the polymer material as a carrier to form a powder material. The powder material is directly sprayed into a hearth by using a pneumatic conveying device, the temperature window of the spraying is 700-900 ℃, chemical bonds connected with amino and macromolecules are broken at high temperature, a large amount of amino-containing energy groups are released, and the amino and NOx in the flue gas react to achieve the aim of removing the NOx. The denitration agent is dry powder, and the macromolecular carbon skeleton is naturally decomposed into CO2 to be released, so that other facilities of the boiler cannot be influenced.
In view of the above, it is necessary to provide a high-reliability selective polymer denitration system, which is easy to form agglomeration and wall-hanging when the polymer denitration agent contacts with air during storage and transportation and thus requires that the storage and transportation processes in the denitration system avoid contact with air.
Disclosure of Invention
The invention aims to provide a high-reliability high-polymer selective denitration system and a high-reliability high-polymer selective denitration process, which have the characteristic of high reliability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-reliability high-polymer selective denitration system comprises a high-polymer denitration agent storage system, a high-polymer denitration agent buffer conveying system, an air supply system, a gas material mixer and an injection system, wherein the high-polymer denitration agent storage system is communicated with the high-polymer denitration agent buffer conveying system;
the polymer denitrifying agent buffer conveying system comprises a buffer hopper and a breathing tube; polymer denitration agent storage system is linked together through the top of unloading pipe with the surge hopper including storing the storehouse jar, the bottom of storing the storehouse pipe, and surge hopper and storing the storehouse jar are seal structure and all are provided with rabbling mechanism, and the upper portion intercommunication of the one end surge hopper of breathing tube, the other end is linked together with the upper portion of storing the storehouse pipe.
Further, the polymer denitration agent buffer conveying system also comprises a screw feeder, a weighing mechanism and a feeding pipe, wherein the bottom of the buffer hopper is provided with a feeding pipe communicated with the screw feeder; the weighing mechanism is arranged corresponding to the screw feeder and used for weighing the buffer hopper and the screw feeder and calculating the weight reduction of the buffer hopper and the screw feeder; one end of the feeding pipe is communicated with the discharge end of the spiral feeder, and the other end of the feeding pipe is communicated with the gas-material mixer; the feeding pipe is provided with an air lock.
Furthermore, the storage bin is provided with a purging mechanism and a vibrator, the purging mechanism comprises a compressed air system, a first purging pipeline, a second purging pipeline and a third purging pipeline, and the first purging pipeline, the second purging pipeline and the third purging pipeline are all communicated with the compressed air system;
the first purging pipeline and the second purging pipeline are arranged at the lower part of the storage bin tank from top to bottom and communicated with the storage bin tank, and the third purging pipeline is communicated with the blanking pipe.
Further, the blanking pipe is provided with a gate valve and a rotary valve, the gate valve is arranged close to the storage bin tank, and the rotary valve is arranged close to the buffer hopper;
a plurality of through holes are uniformly formed in the circumferential surface of the blanking pipe, the third purging pipeline is communicated with the through holes, and the through holes are located above the gate valve.
Furthermore, a safety pressure release valve, a vacuum feeding port, a dust remover and a material level alarm are arranged at the top of the storage bin tank.
Further, the storage bin tank is provided with an electric heat tracing device and a temperature sensor.
Furthermore, the injection system comprises a compressed air mechanism for injection and a plurality of spray guns, the spray guns are provided with a feed inlet and an air inlet, the feed inlet is communicated with the gas-material mixer, and the air inlet is communicated with the compressed air mechanism for injection;
the spray gun is erected on a waste heat boiler, and the waste heat boiler is connected with an incinerator.
Furthermore, the air supply system comprises a working Roots blower and a standby Roots blower which are communicated with the gas-material mixer through pipelines.
Furthermore, a polymer denitrifying agent storage system, a polymer denitrifying agent buffer conveying system, a gas-material mixer and a spraying system form a denitrifying group, and the denitrifying group is provided with a plurality of groups;
each denitration group is corresponding to a working Roots blower, and pipelines communicated with the plurality of working Roots blowers and the gas material mixer are communicated with the standby Roots blower.
The denitration process adopting the high-reliability high-polymer selective denitration system comprises the following steps:
(1) and feeding: the high-molecular denitration agent is subjected to vacuum feeding through a vacuum feeding hole in the upper part of the storage bin tank, the storage bin tank is provided with a material level alarm, and feeding is stopped when the high-molecular denitration agent in the storage bin tank reaches the highest material level;
(2) and buffer conveying: while the stirring mechanism stirs, the storage bin tank feeds materials to the buffer hopper through the feeding pipe; the bottom of the buffer hopper is connected with a spiral feeder through a feeding pipe, and the spiral feeder is also correspondingly provided with a weighing mechanism; the spiral feeder feeds to the gas-material mixer, the weighing mechanism is used for weighing the buffer hopper and the spiral feeder and calculating the reduced weight of the buffer hopper and the spiral feeder, and the feeding amount is calculated according to the reduced weight;
(3) mixing gas and materials: after the screw feeder feeds materials into the gas-material mixer, conveying air generated by the air supply system enters the gas-material mixer, the conveying air and the high-molecular denitration agent in the gas-material mixer are mixed to form an air-powder mixture, the air-powder mixture enters the injection system, and the air-powder mixture is injected into the waste heat boiler by the injection system.
The invention has the beneficial effects that:
the high-molecular selective denitration system disclosed by the invention comprises a high-molecular denitration agent storage system, a high-molecular denitration agent buffer conveying system, an air supply system, a gas-material mixer and an injection system, wherein each system can be controlled by a controller, and the controllers coordinate the working sequence of each system, so that an intelligent and automatic denitration process can be realized.
The storage bin and the buffer hopper are both sealed structures, so that the polymer denitration agent in the storage bin is isolated from air, and the polymer denitration agent is ensured to have better fluidity and less wall hanging phenomenon. The storage bin tank and the buffer hopper are communicated through the breathing pipe, the air pressure balance of the polymer denitration agent storage system and the polymer denitration agent buffer conveying system is guaranteed, and the blanking is smooth under the condition that the two systems are kept in a sealing state.
Drawings
FIG. 1 is a schematic structural diagram of a selective denitration system for polymer according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a selective denitration system for polymer according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a selective polymer denitration system according to another embodiment of the present invention;
the device comprises a polymer denitrifying agent storage system 1, a polymer denitrifying agent buffer conveying system 2, an air supply system 3, a gas-material mixer 4, an injection system 5, a waste heat boiler 6, a storage bin tank 11, a blanking pipe 12, a purging mechanism 13, a rapper 14, a gate valve 121, a rotary valve 122, a compressed air system 131, a first purging pipeline 132, a second purging pipeline 133, a third purging pipeline 134, a safety relief valve 111, a vacuum feeding port 112, a dust remover 113, a material level alarm 114, an electric tracing heater 115, a temperature sensor 116, a buffer hopper 21, a breathing pipe 22, a screw feeder 23, a weighing mechanism 24, a feeding pipe 25, a feeding pipe 26, an air lock 26, a working Roots blower 31 and a standby Roots blower 32.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and the detailed description.
In order to achieve the purpose, the invention adopts the following technical scheme:
as shown in fig. 1, an embodiment of the present invention provides a high-reliability polymer selective denitration system, which includes a polymer denitration agent storage system 1, a polymer denitration agent buffer conveying system 2, an air supply system 3, a gas-material mixer 4 and an injection system 5, wherein the polymer denitration agent storage system 4 is communicated with the polymer denitration agent buffer conveying system 2, the air supply system 3 and the injection system 5 are respectively communicated with the gas-material mixer 4, a polymer denitration agent in the polymer denitration agent storage system 1 enters the gas-material mixer 4 through the polymer denitration agent buffer conveying system 2, and is supplied to the injection system 5 by a conveying air generated by the air supply system 3 in the gas-material mixer 4;
the polymer denitration agent buffer conveying system 2 comprises a buffer hopper 21 and a breathing tube 22; polymer denitration agent storage system 1 is linked together through unloading pipe 12 and buffer hopper 21's top including storage silo jar 11, storage silo pipe 11's bottom, and buffer hopper 21 and storage silo jar 11 are seal structure and all are provided with rabbling mechanism, and the upper portion intercommunication of the one end buffer hopper 21 of breathing tube 22, the other end is linked together with storage silo pipe 11's upper portion.
The high-molecular selective denitration system comprises a high-molecular denitration agent storage system 1, a high-molecular denitration agent buffer conveying system 2, an air supply system 3, a gas-material mixer 4 and an injection system 5, wherein all the systems can be controlled by a controller, and the controller coordinates the working sequence of all the systems, so that an intelligent and automatic denitration process can be realized. The storage bin 11 and the buffer hopper 21 are both sealed structures, so that the polymer denitration agent in the storage bin is isolated from air, and the polymer denitration agent is ensured to have better fluidity and less wall hanging phenomenon. Storage storehouse jar 11 and buffer hopper 21 adopt breathing pipe 22 intercommunication, have guaranteed that polymer denitration agent storage system 1 and polymer denitration agent buffering conveying system 2's atmospheric pressure is balanced, and the blanking is smooth and easy under two systems keep a sealing state.
The selective denitration system shown in fig. 1 is suitable for an incinerator, wherein one incinerator corresponds to a waste heat boiler, and hot exhaust gas in the incinerator is conveyed into the waste heat boiler. The injection system is arranged on the waste heat boiler, and the high-molecular denitration agent is injected into the waste heat boiler to perform denitration treatment on the waste gas.
Further, the polymer denitration agent buffer conveying system 2 further comprises a screw feeder 23, a weighing mechanism 24 and a feeding pipe 25, and a feeding pipe 26 communicated with the screw feeder 23 is arranged at the bottom of the buffer hopper 21; the weighing mechanism 24 is positioned corresponding to the screw feeder 23 for weighing the buffer hopper 21 and the screw feeder 23 and calculating the reduced weight of the two; one end of the feeding pipe 25 is communicated with the discharge end of the screw feeder 23, and the other end is communicated with the gas-material mixer 4; the feed pipe 25 is provided with a gas lock 26.
The top feed inlet of the screw feeder 23 is connected with the blanking pipe 12 through a telescopic hose, and the discharge outlet of the screw feeder 23 is also connected with the feeding pipe 25 through a telescopic hose. The setting of scalable hose can reduce the influence of weighing of small material pipe 12 and feed pipe 25 to weighing mechanism 24, and weighing mechanism 24 can be comparatively accurate weigh the weight of buffer hopper 21 and screw feeder 23, calculates the feed rate and monitors feed speed through the difference method, guarantees accurate unloading volume to accomplish dosing.
When the air supply system 3 supplies air to the air mixer 4, the conveying air in the air mixer 4 may enter the feeding pipe 25, and the air lock 26 on the feeding pipe 25 can prevent the conveying air in the air mixer 4 from entering the feeding pipe 25.
Further, the storage tank 11 is provided with a purging mechanism 13 and a rapper 14, the purging mechanism 13 comprises a compressed air system 131, a first purging pipeline 132, a second purging pipeline 133 and a third purging pipeline 134, and the first purging pipeline 132, the second purging pipeline 133 and the third purging pipeline 134 are all communicated with the compressed air system 131;
the first purge pipeline 132 and the second purge pipeline 133 are disposed at the lower portion of the storage tank 11 from top to bottom and are communicated with the storage tank 11, and the third purge pipeline 134 is communicated with the blanking pipe 12.
After the polymer denitration agent in the storage silo 11 is used, the storage silo 11 needs to be cleaned. The rapping device 14 is arranged on the outer wall of the lower part of the storage bin tank 11, and the rapping device 14 is started to rap the storage bin tank 11 so that the high polymer denitration agent on the inner wall of the tank is shaken off. The purging mechanism 13 in cooperation with the rapping device 14 can clean up the polymer denitrifier in the storage silo 11. The peripheral wall of the lower part of the storage bin tank 11 is uniformly provided with vent holes, the vent holes are communicated with the first blowing pipeline 132 or the second blowing pipeline 133, and air flow in the two blowing pipelines can enter the tank body around the lower part of the storage bin tank 11, so that the blowing uniformity is ensured.
The third pipeline 134 that sweeps can sweep remaining polymer denitration agent in unloading pipe 12 for the polymer denitration agent in storage silo jar 11 and the unloading pipe 12 is by the clean up, prevents that it is rotten to remain polymer denitration agent and produces the influence to the polymer denitration agent of new unloading.
The third purging pipeline 134 can also play a role in flow aiding, and when the storage bin 11 is discharged to the buffer hopper 21, the compressed air can assist in flow aiding to enable the polymer denitration agent to be smoothly discharged and enter the buffer conveying system.
Further, the blanking pipe 12 is provided with a gate valve 121 and a rotary valve 122, the gate valve 121 is arranged close to the storage bin 11, and the rotary valve 122 is arranged close to the buffer hopper 21;
a plurality of through holes are uniformly formed in the circumferential surface of the blanking pipe 12, the third purging pipeline 134 is communicated with the through holes, and the through holes are located above the gate valve 121.
The gate valve 121 is a manual valve, so that an operator can control blanking emergently. The valve 122 is a rotary valve, which can be controlled by a controller. During the blanking, the opening of the rotary valve 122 is adjusted according to the weight information fed back by the weighing mechanism 24, and the blanking speed is controlled.
The communication part of the third purging pipeline 134 and the blanking pipe 12 is arranged above the gate valve 121, so that the wall-hung polymer denitration agent can be conveniently purged.
Further, a safety relief valve 111, a vacuum feeding port 112, a dust remover 113 and a level alarm 114 are arranged at the top of the storage bin 11. The polymer denitration agent is fed in a vacuum mode, and the safety pressure release valve 111 can prevent positive pressure from occurring in the bin, so that smooth feeding is ensured; the dust remover 113 can prevent dust from diffusing and polluting the surrounding working environment when the bin is loaded. The level alarm 114 comprises a high level alarm and a low level alarm, which alarm when the polymer denitration agent powder in the bin is too much or too little. The storage silo 11 can store the polymer denitration agent for a long time, and avoids the moisture absorption of the polymer denitration agent in the storage process to harden.
Further, the storage silo 11 is provided with an electric tracer 115 and a temperature sensor 116. The electric tracing device 115 is in a strip shape and is wound on the outer wall of the storage bin tank 11, the temperature of the storage bin tank 11 is maintained at 30-50 ℃, and the temperature sensor 116 can obtain the surface temperature of the storage bin tank 11, so that the temperature of the bin tank is monitored.
Further, the injection system 5 comprises a compressed air mechanism 51 for injection and a plurality of spray guns 52, the spray guns 52 are provided with a feed inlet and an air inlet, the feed inlet is communicated with the gas-material mixer 4, and the air inlet is communicated with the compressed air mechanism 51 for injection; the lance 52 is mounted on the exhaust-heat boiler 6, and the exhaust-heat boiler 6 is connected to the incinerator. The compressed air generated by the compressed air injection mechanism 51 contributes to the air-powder mixture in the spray gun 52 and enhances the cooling effect on the spray gun. The compressed air has the function of protecting the high-molecular denitration agent spray gun 52 when the furnace is stopped.
Further, the air supply system 3 comprises a working roots blower 31 and a standby roots blower 32, and both the working roots blower 31 and the standby roots blower 32 are communicated with the gas material mixer 4 through pipelines. The pipeline is provided with a butterfly valve, and the switching of the two Roots blowers is realized by controlling the opening and closing of the butterfly valve.
The denitration process adopting the high-reliability high-polymer selective denitration system comprises the following steps:
(1) and feeding: the polymer denitration agent is subjected to vacuum feeding through a vacuum feeding port 112 at the upper part of the storage bin tank 11, the storage bin tank 11 is provided with a material level alarm 114, and feeding is stopped when the polymer denitration agent in the storage bin tank 11 reaches the highest material level;
(2) and buffer conveying: while the stirring mechanism stirs, the storage bin 11 feeds materials to the buffer hopper 21 through the feeding pipe 12; the bottom of the buffer hopper 21 is connected with a screw feeder 23 through a feeding pipe 25, and the screw feeder 23 is also correspondingly provided with a weighing mechanism 24; the screw feeder 23 feeds the gas-material mixer 4, and the weighing mechanism 24 is used for weighing the buffer hopper 32 and the screw feeder 23 and calculating the reduced weight of the buffer hopper 32 and the screw feeder 23, and calculating the feeding amount according to the reduced weight;
(3) mixing gas and materials: after the screw feeder 23 feeds the gas-material mixer 4, the conveying air generated by the air supply system 3 enters the gas-material mixer 4, the conveying air is mixed with the high-molecular denitration agent in the gas-material mixer 4 to form an air-powder mixture, the air-powder mixture enters the injection system 5, and the air-powder mixture is injected into the exhaust-heat boiler 6 by the injection system 5.
Further, as shown in fig. 2 and fig. 3, in the high-reliability polymer selective denitration system of the present invention, a polymer denitration agent storage system 1, a polymer denitration agent buffer conveying system 2, an air-fuel mixer 4 and an injection system 5 form a denitration group, and have a plurality of groups; each denitration group is corresponding to a working Roots blower 31, and pipelines communicated with the working Roots blowers 31 and the gas material mixer 4 are communicated with a standby Roots blower 32.
Among them, the polymer selective denitration system shown in fig. 2 is applied to two incinerators, and the polymer selective denitration system shown in fig. 3 is applied to 3 incinerators.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A high-reliability high-polymer selective denitration system is characterized by comprising a high-polymer denitration agent storage system, a high-polymer denitration agent buffer conveying system, an air supply system, a gas material mixer and an injection system, wherein the high-polymer denitration agent storage system is communicated with the high-polymer denitration agent buffer conveying system;
the polymer denitration agent buffer conveying system comprises a buffer hopper and a breathing tube; polymer denitration agent storage system is including storing the storehouse jar, the bottom of storing the storehouse pipe is linked together through the top of unloading pipe with the surge hopper, surge hopper and storing the storehouse jar are seal structure and all are provided with rabbling mechanism, the upper portion intercommunication of the one end surge hopper of breathing tube, the other end is linked together with the upper portion of storing the storehouse pipe.
2. The high-reliability high-polymer selective denitration system according to claim 1, wherein the high-polymer denitration agent buffer conveying system further comprises a screw feeder, a weighing mechanism and a feeding pipe, and the bottom of the buffer hopper is provided with the feeding pipe communicated with the screw feeder; the weighing mechanism corresponds to the screw feeder in position and is used for weighing the buffer hopper and the screw feeder and calculating the reduced weight of the buffer hopper and the screw feeder; one end of the feeding pipe is communicated with the discharge end of the spiral feeder, and the other end of the feeding pipe is communicated with the gas-material mixer;
the feeding pipe is provided with an air lock.
3. The high-reliability high-molecular selective denitration system according to claim 1, wherein the storage bin is provided with a purging mechanism and a vibrator, the purging mechanism comprises a compressed air system, a first purging pipeline, a second purging pipeline and a third purging pipeline, and the first purging pipeline, the second purging pipeline and the third purging pipeline are all communicated with the compressed air system;
the first purging pipeline and the second purging pipeline are arranged on the lower portion of the storage bin tank from top to bottom and are communicated with the storage bin tank, and the third purging pipeline is communicated with the blanking pipe.
4. The high-reliability high-polymer selective denitration system according to claim 1, wherein the blanking pipe is provided with a gate valve and a rotary valve, the gate valve is arranged close to the storage bin, and the rotary valve is arranged close to the buffer hopper;
the peripheral surface of the blanking pipe is evenly provided with a plurality of through holes, the third purging pipeline is communicated with the through holes, and the through holes are located above the gate valve.
5. The high-reliability high-polymer selective denitration system according to claim 1, wherein a safety pressure release valve, a vacuum feeding port, a dust remover and a material level alarm are arranged at the top of the storage bin.
6. The system of claim 1, wherein the storage tank is provided with an electric heater and a temperature sensor.
7. The high-reliability high-molecular selective denitration system according to claim 1, wherein the injection system comprises a compressed air mechanism for injection and a plurality of spray guns, each spray gun is provided with a feed inlet and an air inlet, the feed inlets are communicated with a gas-material mixer, and the air inlets are communicated with the compressed air mechanism for injection;
the spray gun is erected on a waste heat boiler, and the waste heat boiler is connected with an incinerator.
8. The high-reliability high-polymer selective denitration system according to claim 1, wherein the air supply system comprises a working roots blower and a standby roots blower, and the working roots blower and the standby roots blower are both communicated with the gas material mixer through pipelines.
9. The system of claim 8, wherein the polymer denitration agent storage system, the polymer denitration agent buffer delivery system, the gas-material mixer and the injection system are a denitration group having a plurality of groups;
each denitration group is corresponding to a working Roots blower, and a plurality of pipelines communicated with the working Roots blower and the gas material mixer are communicated with the standby Roots blower.
10. The denitration process using the high-reliability polymer selective denitration system according to any one of claims 1 to 9, comprising the steps of:
(1) and feeding: the high-molecular denitration agent is subjected to vacuum feeding through a vacuum feeding hole in the upper part of the storage bin tank, the storage bin tank is provided with a material level alarm, and feeding is stopped when the high-molecular denitration agent in the storage bin tank reaches the highest material level;
(2) and buffer conveying: while the stirring mechanism stirs, the storage bin tank feeds materials to the buffer hopper through a feeding pipe; the bottom of the buffer hopper is connected with a screw feeder through a feeding pipe, and the screw feeder is also correspondingly provided with a weighing mechanism; the screw feeder feeds to the gas-material mixer, the weighing mechanism is used for weighing the buffer hopper and the screw feeder and calculating the reduced weight of the buffer hopper and the screw feeder, and the feeding amount is calculated according to the reduced weight;
(3) mixing gas and materials: after the spiral feeder feeds materials into the gas-material mixer, conveying air generated by the air supply system enters the gas-material mixer, the conveying air and the high-molecular denitration agent in the gas-material mixer are mixed to form an air-powder mixture, the air-powder mixture enters the injection system, and the air-powder mixture is injected into the waste heat boiler by the injection system.
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