CN114653200A - Dry denitration system for incinerator flue gas - Google Patents
Dry denitration system for incinerator flue gas Download PDFInfo
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- CN114653200A CN114653200A CN202210289669.1A CN202210289669A CN114653200A CN 114653200 A CN114653200 A CN 114653200A CN 202210289669 A CN202210289669 A CN 202210289669A CN 114653200 A CN114653200 A CN 114653200A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 239000003546 flue gas Substances 0.000 title claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 64
- 238000003860 storage Methods 0.000 claims abstract description 46
- 238000002347 injection Methods 0.000 claims abstract description 23
- 239000007924 injection Substances 0.000 claims abstract description 23
- 238000005303 weighing Methods 0.000 claims abstract description 20
- 239000000428 dust Substances 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 8
- 229910021529 ammonia Inorganic materials 0.000 abstract description 4
- 238000001035 drying Methods 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 16
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
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- 239000004745 nonwoven fabric Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
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- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
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- 239000000203 mixture Substances 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
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- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
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- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- 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
- B01D53/26—Drying gases or vapours
-
- 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
- B01D53/82—Solid phase processes with stationary 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
-
- 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
- B01D2258/0291—Flue gases from waste incineration plants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
- F23J2215/101—Nitrous oxide (N2O)
Abstract
The invention discloses a dry denitration system for incinerator flue gas, which comprises: a dust remover and a dryer are arranged on a vent pipe of the denitration agent storage bin; rotary conveyors are connected below the denitration agent storage bin, and each rotary conveyor is connected with a vacuum feeding device through a pipeline; a buffer bin is connected below each vacuum feeding device, and a weighing and metering bin is arranged below each buffer bin; the bottom of the weighing and metering bin is provided with a platform scale; the weighing and metering bin is connected with the rotary discharger; of rotary dumpers and feedersThe upper feed inlet is connected; the front port of the feeder is connected with the Roots blower through an air pipe, and the rear port of the feeder is connected with the primary distributor; the first-stage distributor is provided with a plurality of injection pipelines, and each injection pipeline is connected with one injector; the inlet end of the ejector is equipped with a mixer. The dry-process denitration system can effectively improve the denitration efficiency and remove NO more efficientlyXPollutants, lower ammonia escape rate and lower denitration agent cost.
Description
Technical Field
The invention belongs to the technical field of atmospheric pollution treatment, and particularly relates to a dry-method denitration system for incinerator flue gas.
Background
Garbage, sludge, biomass and other domestic wastes contain more nitrogen elements, a large amount of nitrogen oxides can be generated in the garbage incineration process, and the emission control of the nitrogen oxides is the key point in a flue gas treatment system.
Enterprises in the existing market generally adopt a dry denitration technology to control the emission of nitrogen oxides in incineration flue gas. The dry denitration technology is that under the action of a catalyst (or in the absence of the catalyst), hydrocarbon (such as methane, propane and the like), ammonia, urea and the like are used as reducing agents to selectively react with NOx in flue gas to generate nontoxic pollution-free nitrogen and water. Conventional dry denitration techniques include selective non-catalytic reduction (SNCR) denitration techniques and Selective Catalytic Reduction (SCR) denitration techniques. Along with the gradual tightening of national policies and the comprehensive implementation of ultralow emission modification, the temperature of furnace flue gas in part of industries is not high (such as sludge incineration flue gas), the reaction efficiency of the SNCR denitration technology is not high, and the ultralow emission standard (100 mg/Nm) of the flue gas cannot be met3) The market demand can not be met. The SCR denitration technology gradually becomes the mainstream denitration technology.
However, the prior equipment investment of the SCR denitration technology is high, the occupied area is large, the construction cost and the operation cost are high, and the used catalyst is dangerous waste. The existing dry denitration process also has the following defects: (1) the denitration agent storage bin and the air communication opening are filtered by non-woven fabrics, wet air directly enters the storage bin, and the air sucked into the storage bin is not dried, so that the denitration agent is easy to absorb moisture and agglomerate; (2) when the denitration agent storage bin adopts vertical storage, an arch breaking device such as a rapping device or an air cannon is arranged on the bin wall, the arch breaking device only plays an arch breaking role, and after the denitration agent absorbs moisture and agglomerates, the arch breaking device cannot play a role in breaking agglomerates, so that the feed opening of the storage bin is easily blocked; (3) when the horizontal storage bin is adopted in the denitration agent storage bin, the denitration agent feeding unit is simple, the weighing and feeding unit is not arranged, the conveying amount of the agent is adjusted only by the rotating speed of the screw conveyor, the accuracy of the feeding amount of the agent is inaccurate, the ammonia escape is high, and the agent consumption is large; (4) the mixing effect of the denitrifier and the flue gas of the ejector is poor.
Disclosure of Invention
The invention aims to provide a dry-method denitration system for incinerator flue gas, which solves the problems of poor operation stability, poor denitration effect caused by the fact that denitration agent moisture absorption agglomeration blocks conveying equipment and a spray gun has poor spraying effect in the prior art, and meets the requirement of the emission of nitrogen oxides of the ultralow emission standard of flue gas.
The purpose of the invention is realized by the following technical scheme:
the invention discloses a dry denitration system for incinerator flue gas, which is characterized by comprising the following components:
the denitration agent storage bin is characterized in that a dust remover and a dryer are sequentially arranged on a vent pipe of the denitration agent storage bin, and ambient air firstly removes water vapor through the dryer and then enters the denitration agent storage bin after being dedusted by the dust remover;
at least one rotary conveyor is connected below the denitration agent storage bin, and each rotary conveyor is connected with a vacuum feeding device through a pipeline; a buffer bin is connected below each vacuum feeding device, and a weighing and metering bin is arranged below each buffer bin; the bottom of the weighing and metering bin is provided with a platform scale, and the mass of the denitration agent reduced can be weighed in real time through the platform scale; the weighing and metering bin is connected with the rotary discharger and is used for adjusting the conveying amount of the denitrifying agent; the rotary discharger is connected with an upper feeding port of the feeder;
the front port of the feeder is connected with a Roots blower through an air pipe, and the rear port of the feeder is connected with a primary distributor through a conveying pipeline; the primary distributor is provided with a plurality of injection pipelines, and each injection pipeline is connected with one injector; the inlet end of the ejector is provided with a mixer for uniformly distributing the denitrifier in the ejector pipe of the ejector.
1 rotary conveyor, 1 vacuum loading attachment, 1 buffer bin, 1 weighing and metering bin, 1 rotatory tripper and 1 feeder constitute a feeding module jointly, adjust the quantity of feeding module according to burning line quantity.
Preferably, the primary distributor is provided with a plurality of branch pipelines, and each branch pipeline is connected with one secondary distributor; each secondary distributor is provided with a plurality of injection pipelines, each injection pipeline is connected with one ejector, and the inlet end of each ejector is provided with a mixer; each branch pipeline is provided with a switching valve, and the first-stage distribution system controls a preset area to be closed or activated through the cutting off and activation of the branch pipeline; and each injection pipeline is provided with a switch valve for switching off and activating the injection pipelines to control the number of the closed or activated injectors.
Preferably, the denitration agent is a powdery or granular dry denitration agent mixed by one or more of amino-containing polymer agents, organic amines (such as melamine and cyanuric acid), urea and oxidizing agents (such as potassium permanganate).
Preferably, the mixer is one of pipeline static mixers, which plays roles of diversion and mixing.
Preferably, the ejector is composed of two coaxially overlapped metal round pipes and is fixedly connected through 2-8 supporting plates, a mixture channel of a medicament and air is arranged in an inner pipe, and cooling air flows through a slit between the inner pipe and an outer pipe; the exit end department of inner tube has a necking down, plays the effect of improving the gas velocity of flow, the necking down diameter is 1/2 ~ 2/3 of inner tube diameter, expand the pipe section inner wall contained angle behind the necking down and be 15 ~ 30.
More preferably, a solid cone is arranged at the outlet of the ejector, the cone angle of the cone extends into the inner pipe, the cone angle is 15-30 degrees, and the bottom surface of the cone is fixedly connected with the inner pipe through 3-6 supporting plates.
Compared with the prior art, the invention has the advantages that:
according to the dry-process denitration system, the dust remover and the dryer are arranged on the vent pipe of the denitration agent storage bin, so that the air in the storage bin is kept in a relatively dry state, and the problem of blockage caused by moisture absorption and adhesion of the denitration agent is avoided; the mixer is arranged at the inlet end of the ejector, so that the ejection is more uniform, and the denitration efficiency is improved; the uniformity of the spray is further improved if the unique spray of the present invention is used. The dry-method denitration system can select the optimal injection layer according to the incineration condition of the boiler, effectively improve the denitration efficiency and remove NO more efficientlyXThe pollutant has lower ammonia escape rate and lower denitration agent cost.
Drawings
FIG. 1 is a schematic diagram of a dry denitration method for a circulating fluidized bed according to the present invention;
FIG. 2 is a schematic radial cross-section of a prior art injector;
FIG. 3 is a schematic transverse cross-sectional view at a prior art injector nozzle;
FIG. 4 is a schematic radial cross-section of an injector of the present invention;
FIG. 5 is a schematic transverse cross-section at the injector nozzle of the present invention;
in the figure, 1-vacuum feeding device, 2-denitration agent storage bin, 3-dust remover, 4-dryer, 5-rotary conveyor, 6-vacuum feeding device, 7-buffer storage bin, 8-weighing and metering bin, 9-rotary discharger, 10-feeder, 11-first-stage distributor, 12-Roots blower, 13-second-stage distributor, 14-switching valve, 15-switching valve, 16-mixer and 17-ejector; 171-outer tube, 172-inner tube, 173-support plate, 174-constriction, 175-cone.
The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles and basic structures of the invention. The embodiments covered by the solution according to the invention are not limited to the embodiments and examples illustrated in the attached drawings.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A dry denitration system for incinerator flue gas, comprising:
the denitration agent storage bin 2 is characterized in that a dust remover 3 and a dryer 4 are sequentially arranged on a vent pipe of the denitration agent storage bin 2, ambient air firstly removes water vapor through the dryer 4 and then enters the denitration agent storage bin 2 after being dedusted by the dust remover 3, so that the air in the storage bin is kept in a relatively dry state, and the problem of blockage caused by moisture absorption and adhesion of the denitration agent is avoided;
at least one rotary conveyor 5 is connected below the denitration agent storage bin 2, and each rotary conveyor 5 is connected with a vacuum feeding device 6 through a pipeline; a buffer bin 7 is directly connected below each vacuum feeding device 6, and a weighing and metering bin 8 is arranged below each buffer bin 7; the bottom of the weighing and metering bin 8 is fixedly provided with a platform scale, and the mass reduced by the denitrifying agent can be weighed in real time through the platform scale; the weighing and metering bin 8 is connected with a rotary discharger 9 and is used for adjusting the conveying amount of the denitration agent; the rotary discharger 9 is connected with an upper feeding port of the feeder 10;
1 rotary conveyor 5, 1 vacuum feeding device 6, 1 buffer storage bin 7, 1 weighing and metering bin 8, 1 rotary discharger 9 and 1 feeder 10 jointly form a feeding module, and the number of the feeding modules is adjusted according to the number of burning lines;
the front port of the feeder 10 is connected with a Roots blower 12 through an air pipe, and the rear port is connected with a primary distributor 11 through a conveying pipeline; the primary distributor 11 is provided with a plurality of injection pipelines, and each injection pipeline is connected with one injector 17; the inlet end of the ejector 17 is provided with a mixer 16 for uniformly distributing the denitrifier in the ejector pipe of the ejector.
Preferably, the primary distributor 11 is provided with a plurality of branch pipelines, and each branch pipeline is connected with one secondary distributor 13; each secondary distributor 13 is provided with a plurality of injection pipelines, each injection pipeline is connected with one ejector 17, and the inlet end of each ejector 17 is provided with a mixer 16; a switching valve 14 is arranged on each branch pipeline, and the first-stage distribution system controls the closing or starting of a preset area through the cutting and starting of the branch pipelines; each injection line is provided with a switching valve 15 for switching off and activating the injection line to control the number of injectors to be closed or activated.
Preferably, the mixer 16 is one of a static mixer in pipeline, which performs the functions of diversion and mixing; compressed air blowing is arranged around the ejector 17 and used for cooling the ejector 17.
Preferably, the injector 17 is composed of two coaxially overlapped metal circular tubes, and is fixedly connected by 2-8 supporting plates 173, wherein a mixture channel of a medicament and air is arranged in an inner tube 172, and cooling air flows through a slit between the inner tube 172 and an outer tube 171; the exit end department of inner tube 172 has a necking down 173, plays the effect of improving the gas velocity of flow, necking down 174 diameter is 1/2 ~ 2/3 of inner tube 172 diameter, the back expander section inner wall contained angle of necking down 173 is 15 ~ 30.
More preferably, a solid cone 175 is arranged at the outlet of the ejector 17, the cone 175 has a cone angle of 15-30 degrees and extends into the inner tube, and the bottom surface of the cone 175 is fixedly connected with the inner tube through 3-6 support plates 173. The added cone can play a role in guiding flow, so that airflow is diffused in a larger range after passing through the cone, the turbulence degree of the air is enhanced, and a medicament is more uniformly distributed in airflow diffusion and has a wider spraying range.
Preferably, a vacuum feeding device 1 is arranged above the denitration agent storage bin 2 and used for sucking out the denitration agent from the denitration agent bag under negative pressure and dropping the denitration agent into the denitration agent storage bin 2 through gravity.
Preferably, when the denitration agent storage bin 2 adopts a vertical storage bin, a double-screw stirrer is arranged in the bin; when a horizontal storage bin is adopted, a helical ribbon type stirrer is arranged in the bin; the stirrer can well perform the crushing function. More preferably, the denitration agent storage bin 2 is a horizontal storage bin.
Preferably, the vacuum feeding device 6 is connected with the cache bin 7 by a hoop; the buffer bin 7 and the weighing and metering bin 8 are in flexible connection by adopting non-woven fabrics, leather, plastic cloth and the like; the rotary discharger 9 and the feeder 10 are in soft connection by adopting non-woven fabrics, leather, plastic cloth and the like.
Preferably, each sub-device of the dry-process denitration system is connected with an external automatic control system, and can control the automatic denitration agent feeding, denitration agent mass flow, denitration agent injection speed and system interlock start-stop protection of the vacuum feeding device 6 and the buffer bin 7; and can calculate and analyze according to the NOx concentration of exhanst gas outlet and obtain the denitrifier quantity to in time control denitrifier feed volume, avoided the excessive consumption condition of denitrifier.
Example 1
Hoisting the bagged denitration agent to the upper part of the denitration agent storage bin 2 by using an electric hoist, and manually pouring the denitration agent into the denitration agent storage bin 2; or the powdery or granular denitration agent is sucked into the vacuum feeding device 1 from the denitration agent bag by adopting negative pressure pneumatic conveying, a flap valve in the vacuum feeding device 1 is opened, and the material falls into the denitration agent storage bin 2 by gravity; the environmental air enters the denitration agent storage bin 2 after being dedusted by the dryer 4 and the deduster 3;
the denitration agent in the denitration agent storage bin 2 is distributed and sent into a plurality of rotary conveyors 5, is sucked out by a vacuum feeding device 6 by vacuum pumping negative pressure, falls into a buffer bin 7 by gravity, falls into a weighing and metering bin 8 by gravity, and is weighed by a platform scale at the bottom of the weighing and metering bin 8 in real time; the rotary discharger 9 feeds the weighed denitrifier into the feeder 10 from the upper end opening of the feeder 10; positive pressure air generated by the Roots blower 12 is mixed with the denitrifier in the feeder 10, and then is conveyed to the primary distributor 11 by wind power; the denitrifier is distributed by the first-stage distributor 11 to each injector 17 connected to the pipeline, and is uniformly distributed by the mixer 16, and then is injected into the incinerator by the injector 17.
When a plurality of injector groups are provided, the denitrating agent is distributed to a plurality of secondary distributors 13 of different preset areas in the primary distributor 11, and then is distributed to the injectors 17 connected with each injection pipeline of the same area by the secondary distributors 13; the number of injectors used can be adjusted by opening and closing the primary valve 14 on each branch line or the secondary valve 15 on the injection line.
The dry denitration control system is mainly used for controlling the automatic denitration agent feeding of the buffer bin 7, controlling the mass flow of the denitration agent, controlling the speed of the denitration agent sprayed into the furnace and carrying out interlocking start-stop protection on each system; and inputting the NOx concentration signal of the flue gas outlet into a control system, and obtaining the dosage of the denitration agent through calculation and analysis of the control system. The boiler incineration condition parameters are input into a control system, the ejector selects a preset position to be put into operation according to the real-time incineration condition, the preset position is selected after process calculation and flow field simulation verification, and two or more layers of positions are preset to respectively deal with different incineration conditions of the boiler.
Claims (9)
1. A dry denitration system of incinerator flue gas, characterized by comprising:
a denitration agent storage bin, wherein a dust remover and a dryer are sequentially arranged on a vent pipe of the denitration agent storage bin; at least one rotary conveyor is connected below the denitration agent storage bin, and each rotary conveyor is connected with a vacuum feeding device through a pipeline; a buffer bin is connected below each vacuum feeding device, and a weighing and metering bin is arranged below each buffer bin; the bottom of the weighing and metering bin is provided with a platform scale; the weighing and metering bin is connected with the rotary discharger; the rotary discharger is connected with an upper feeding port of the feeder; the front port of the feeder is connected with a Roots blower through an air pipe, and the rear port of the feeder is connected with a primary distributor through a conveying pipeline; the primary distributor is provided with a plurality of injection pipelines, and each injection pipeline is connected with one injector; the inlet end of the ejector is provided with a mixer.
2. The dry denitration system of claim 1, wherein the primary distributor is provided with a plurality of branch pipes, and each branch pipe is connected with one secondary distributor; each secondary distributor is provided with a plurality of injection pipelines, each injection pipeline is connected with one ejector, and the inlet end of each ejector is provided with a mixer; each branch pipeline is provided with a switching valve; each injection pipeline is provided with a switch valve.
3. The dry denitration system of claim 1, wherein the mixer is one of a static mixer in pipeline.
4. The dry denitration system according to claim 1, wherein the injector is composed of two coaxially overlapped metal round tubes, and is fixedly connected through 2-8 support plates; the exit end department of inner tube has a necking down, the necking down diameter is 1/2 ~ 2/3 of inner tube diameter, expand the pipe section inner wall contained angle behind the necking down is 15 ~ 30.
5. The dry denitration system according to claim 4, wherein a solid cone is provided at the outlet of the injector, the cone angle of the cone extends into the inner tube, the cone angle is 15-30 degrees, and the bottom surface of the cone is fixedly connected with the inner tube through 3-6 support plates.
6. The dry denitration system according to claim 1, wherein a vacuum feeding device is arranged above the denitration agent storage bin.
7. The dry denitration system of claim 1, wherein the denitration agent storage bin is a vertical storage bin, and a twin-screw stirrer is arranged in the storage bin.
8. The dry denitration system of claim 1, wherein the denitration agent storage bin is a horizontal storage bin, and a helical ribbon stirrer is arranged in the storage bin.
9. The dry denitration system according to claim 1, wherein the vacuum feeding device is connected with the buffer bin by a clamp; the buffer bin is in flexible connection with the weighing and metering bin; the rotary discharger is in flexible connection with the feeder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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