CN112546863A - Sintering flue gas SCR denitration pretreatment device - Google Patents
Sintering flue gas SCR denitration pretreatment device Download PDFInfo
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000003546 flue gas Substances 0.000 title claims abstract description 64
- 238000005245 sintering Methods 0.000 title claims abstract description 52
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 68
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 68
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000007921 spray Substances 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 29
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000003068 static effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 7
- 229910021529 ammonia Inorganic materials 0.000 description 20
- 239000002737 fuel gas Substances 0.000 description 12
- 238000001704 evaporation Methods 0.000 description 10
- 238000010790 dilution Methods 0.000 description 9
- 239000012895 dilution Substances 0.000 description 9
- 230000008020 evaporation Effects 0.000 description 9
- 238000005507 spraying Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- B01D53/86—Catalytic processes
- B01D53/90—Injecting 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
- B01D53/8621—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
- 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)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (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)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
Abstract
The sintering flue gas SCR denitration pretreatment device comprises a reactor inlet flue, a hot air branch pipe and an ammonia water spray gun, wherein the ammonia water spray gun is directly communicated with the hot air branch pipe at the outlet of a hot blast stove, high-temperature hot air generated by burning blast furnace gas in the hot blast stove is blown into an SCR denitration system through the hot air branch pipe and the reactor inlet flue, and when the ammonia water is sprayed into the hot air branch pipe through the ammonia water spray gun, the high-temperature hot air is mixed and contacted with the ammonia water to heat and evaporate the ammonia water, and the evaporated generated ammonia gas is sprayed into the reactor inlet flue through a hot air nozzle with equal gaps on the hot air branch pipe, so that the hot air and the ammonia gas blown into the cross section of the reactor inlet flue are uniform, and the utilization rate of the ammonia gas and the denitration efficiency of the SCR denitration system are improved.
Description
Technical Field
The invention relates to the technical field of flue gas denitration, in particular to a sintering flue gas SCR denitration pretreatment device.
Background
Frequent haze weather seriously harms the health of people, and NOX is one of main components in haze and mainly comes from the emission of fuel combustion flue gas of a factory, which is particularly obvious in the industries of steel and thermal power generation. In the field of the steel industry, tail gas with low flue gas temperature such as sintering and the like cannot be directly treated by adopting an economic, environment-friendly and efficient low-temperature SCR denitration technology.
At present, an independently arranged ammonia water evaporator is adopted for evaporating ammonia water, a heat source required by the ammonia water evaporation is taken from high-temperature hot flue gas at 280 ℃ behind an SCR (selective catalytic reduction) reactor, ammonia gas generated after the ammonia water evaporation is sprayed into an inlet flue of the reactor through an ammonia spraying grid and is mixed with sintered flue gas to generate denitration reaction on the surface of a catalyst, and thus the flue gas is denitrated. In the prior art, an SCR denitration system needs to be provided with parts such as an ammonia water evaporator, an ammonia spraying grid, a dilution fan, a matched pipeline and the like independently, and has high operation failure rate, investment cost and operation cost.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a pretreatment device for SCR denitration of sintering flue gas, which is used for solving the problems that an SCR denitration system in the prior art needs to separately install parts such as an ammonia evaporator, an ammonia injection grid, a dilution fan, a matching pipeline, etc., and has high operation failure rate, investment cost and operation cost.
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:
the embodiment of the invention provides a sintering flue gas SCR denitration pretreatment device which comprises a reactor inlet flue, a plurality of groups of hot air branch pipes and an ammonia water spray gun, wherein the hot air branch pipes are communicated with the reactor inlet flue, the ammonia water spray gun is provided with an output end, a first input end and a second input end, the output end is communicated with the hot air branch pipes, ammonia water is introduced into the first input end, and air is compressed by the second input end.
Further, a static mixer is arranged in the inlet flue of the reactor.
Furthermore, the static mixers are multiple and are respectively arranged in the inlet flue of the reactor.
Furthermore, the sintering flue gas SCR denitration pretreatment device further comprises a hot blast stove, a gas pipeline and a gas regulating valve, wherein the hot blast stove is communicated with the hot blast branch pipe, the hot blast stove is connected with gas through the gas pipeline, and the gas regulating valve is arranged on the gas pipeline and used for regulating the flow of the gas entering the hot blast stove.
Further, the sintering flue gas SCR denitration pretreatment device also comprises a first flowmeter, and the first flowmeter is installed on the gas pipeline.
Further, the pretreatment device for SCR denitration of sintering flue gas further comprises a temperature detection device, wherein the temperature detection device is installed on the hot air branch pipe, and the temperature detection device is located between the communication position of the ammonia water spray gun and the hot air branch pipe and the communication position of the hot air branch pipe and the reactor inlet flue.
Further, the sintering flue gas SCR denitration pretreatment device is characterized by further comprising an ammonia water assembly and an air assembly, wherein the ammonia water assembly is communicated with the first input end through a pipeline, and the air assembly is communicated with the second input end through a pipeline.
Further, the pretreatment device for SCR denitration of sintering flue gas further comprises a pressure gauge, and the pressure gauge is arranged on the pipeline between the air assembly and the second input end.
Further, the sintering flue gas SCR denitration pretreatment device further comprises a second flowmeter, and the second flowmeter is arranged on a pipeline between the ammonia water assembly and the first input end.
Furthermore, one end of the hot air branch pipe, which is connected with the reactor inlet flue, extends into the reactor inlet flue, and a plurality of hot air nozzles are arranged on the part of the hot air branch pipe, which extends into the reactor inlet flue.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the invention provides a pre-treatment device for SCR denitration of sintering flue gas, which comprises a reactor inlet flue, a hot air branch pipe and an ammonia water spray gun, wherein a plurality of groups of hot air branch pipes are communicated with the reactor inlet flue, one end of each hot air branch pipe, which is connected with the reactor inlet flue, extends into the reactor inlet flue, a plurality of hot air nozzles which are arranged at equal intervals are arranged on the part of each hot air branch pipe, which extends into the reactor inlet flue, the ammonia water spray gun is directly communicated with the hot air branch pipe at the outlet of a hot blast stove, the hot blast stove is blown into an SCR denitration system through the hot air branch pipe and the reactor inlet flue by burning high-temperature hot air generated by blast furnace gas, when the ammonia water is sprayed into the hot air branch pipe through the ammonia water spray gun, the high-temperature hot air is in mixed contact with the ammonia water to heat and evaporate the ammonia water, the ammonia gas generated after evaporation is sprayed into the inlet flue of the reactor by the aid of the equal-gap hot air nozzles on the hot air branch pipes, so that hot air entering the cross section of the inlet flue of the reactor and the ammonia gas blowing uniformity are improved, and the utilization rate of the ammonia gas and the denitration efficiency of the SCR denitration system are improved.
The pretreatment device for SCR denitration of sintering flue gas, provided by the invention, has a simple structure, does not need to be provided with an ammonia water evaporator, an ammonia spraying grid, a dilution fan, a matched pipeline and the like independently, has low investment cost and running cost, can fully realize high-efficiency evaporation of ammonia water and uniform injection of ammonia gas into an inlet flue of a reactor, and realizes high-efficiency uniform mixing of ammonia nitrogen in the inlet flue of the reactor; therefore, the problems that an SCR denitration system in the prior art needs to be provided with parts such as an ammonia evaporator, an ammonia spraying grid, a dilution fan, a matched pipeline and the like independently, the operation failure rate is high, and the investment cost and the operation cost are high are solved.
And, set up one way compressed air and passed through the second input as cold wind and sweep, cool off the protection to the aqueous ammonia spray gun to ensure sintering flue gas SCR denitration pretreatment device operating stability.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a sintering flue gas SCR denitration pretreatment device provided in an embodiment of the present invention when not in operation;
FIG. 2 is a schematic cross-sectional view taken at A-A of FIG. 1;
fig. 3 is a schematic structural diagram of a reactor inlet flue of a sintering flue gas SCR denitration pretreatment device provided in an embodiment of the present invention.
Wherein:
100. an ammonia water spray gun; 101. a first input terminal; 102. a second input terminal; 103. an output end; 200. a hot air branch pipe; 201. a hot air nozzle; 202. a temperature detection device; 300. a reactor inlet flue; 301. a static mixer; 400. an ammonia water component; 401. a second flow meter; 500. an air component; 501. a pressure gauge; 600. a hot blast stove; 601. a gas pipeline; 602. a first flow meter; 603. gas governing valve.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a sintering flue gas SCR denitration pretreatment device provided in an embodiment of the present invention;
as shown in fig. 1-3, the present embodiment provides a sintering flue gas SCR denitration pretreatment device, the sintering flue gas SCR denitration pretreatment device comprises a hot blast stove 600, a gas pipeline 601, a gas regulating valve 603, an ammonia water component 400, an air component 500, a temperature detection device 202, a second flowmeter 602, a reactor inlet flue 300, hot blast branch pipes 200 and ammonia water spray guns 100, wherein a plurality of groups of hot blast branch pipes 200 are communicated with the reactor inlet flue 300, the ammonia lance 100 has an output 103, a first input 101 and a second input 102, the output end 103 is communicated with the hot air branch pipe 200, ammonia water is connected to the first input end 101, air is compressed by the second input end 102, that is, the ammonia water module 400 is communicated with the first input end 101 through a pipeline, and the air module 500 is communicated with the second input end 102 through a pipeline. The ammonia water assembly 400 may be an ammonia cylinder for providing ammonia gas to the first input end 101, and the air assembly 500 may be a compressor for compressing air and inputting the compressed air to the second input end 102 through a pipeline; the output end is a spray head of a spray gun, and the spray head sprays ammonia water into the hot air inlet.
In order to improve the cooling effect of the ammonia water spray gun 100, a third input end may be further disposed on the ammonia water spray gun 100, compressed air is also input to the third input end, a branch pipeline is disposed on the pipeline between the air assembly 500 and the second input end 102, and the compressed air is conveyed to the third input end through the branch pipeline. The ammonia water spray gun 100 adopts a three-fluid and high-temperature-resistant spray gun which is specially designed, a sleeve and a nozzle are made of high-temperature-resistant 310S materials, the maximum temperature resistance is 1200 ℃, meanwhile, one path of compressed air is arranged to be blown and blown as cold air, and the ammonia gas spray gun (including the sleeve) and the hot air nozzle 201 are cooled and protected, so that the operation stability of the sintering flue gas SCR denitration pretreatment device is ensured.
The hot blast stove 600 is communicated with the hot blast branch pipe 200, the hot blast stove 600 is connected with fuel gas through the fuel gas pipeline 601, and the fuel gas regulating valve 603 is arranged on the fuel gas pipeline 601 and used for regulating the flow of the fuel gas entering the hot blast stove 600. The flow rate of the fuel gas delivered into the hot blast stove 600 can be effectively adjusted according to the fuel gas adjusting valve 603, so that the temperature of the hot blast stove 600 outputting hot air is adjusted. The hot blast stove is a hot blast heating device matched with a sintering flue gas SCR denitration system, usually uses blast furnace gas as fuel, after the blast furnace gas is fully combusted in a hearth of the hot blast stove 600, high-temperature hot flue gas with the temperature of 800 plus one 1000 ℃ is formed, and is blown into an inlet flue 300 of the reactor through a hot blast branch pipe 200 to be mixed with a large amount of low-temperature flue gas in the inlet flue 300 of the reactor, so that the temperature of the inlet flue gas of the catalyst is increased, and the temperature required by SCR denitration reaction is met.
The sintering flue gas SCR denitration pretreatment device further comprises a second flowmeter 602, and the second flowmeter 602 is installed on the gas pipeline 601. The blast furnace fuel gas flow rate is adjusted by actually measuring the flow wave of the fuel gas on the fuel gas pipeline 601 through the second flowmeter 602, so that the required flue gas temperature of the SCR denitration reaction is kept within a reasonable range, the effective utilization of the blast furnace fuel gas is realized, and the energy waste is avoided.
Further, the temperature detecting device 202 is installed on the hot air branch pipe 200, and the temperature detecting device 202 is located between a communication position of the ammonia water spray gun 100 and the hot air branch pipe 200 and a communication position of the hot air branch pipe 200 and the reactor inlet flue 300. The temperature detection device 202 is preferably a temperature sensor, which is preferably a thermal resistor. The ammonia water is under the effect of high temperature hot-blast, and the heat absorption evaporation gasification becomes ammonia, and wherein the hot-blast partial heat of high temperature can be in the ammonia water gasification for the in-process loss of ammonia, through every the ammonia water spray gun 100 with the intercommunication department of hot-blast branch pipe 200 with set up the thermal resistance between the intercommunication department of reactor entry flue 300, can effectual real-time supervision reactor entry flue 300 drum hot-blast temperature, when the high temperature or low excessively, adjust the aperture of gas governing valve 603 in real time to cooperate the flowmeter to show, realize the adjustment of gas flow in hot-blast furnace 600, keep in reasonable within range with the required flue gas temperature of the SCR denitration reaction, realize the effective use of blast furnace gas simultaneously, avoid the energy waste.
The number of the hot air branch pipes 200 ranges from 4 to 8, each hot air branch pipe 200 is arranged on the reactor inlet flue 300 in an equal interval and is communicated with the reactor inlet flue 300, the hot air furnace 600 is respectively communicated with each hot air branch pipe 200, one end of each hot air branch pipe 200, which is connected with the reactor inlet flue 300, extends into the reactor inlet flue 300, a part of each hot air branch pipe 200, which extends into the reactor inlet flue 300, is provided with a plurality of hot air nozzles 201 in equal intervals, the plurality of hot air nozzles 201 can be vertically arranged with the hot air branch pipes 200 or can be arranged at included angles of 30 degrees, 45 degrees or 60 degrees, so that ammonia passing through the hot air branch pipes 200 can be input into the reactor inlet flue 300 through the hot air nozzles 201 in multiple angles to form airflow in each direction, thereby make ammonia with the flue gas in the reactor entry flue 300 mixes to promote the ammonia nitrogen misce bene in the reactor entry flue 300, the denitration reaction in the follow-up SCR deNOx systems of being convenient for has improved the utilization ratio of ammonia. The hot air branch pipes 200 and the hot air nozzles 201 are made of 310S high-temperature-resistant materials, so that the stability of the hot air branch pipes 200 and the stability of the hot air nozzles 201 in the using process are guaranteed.
The hot blast stove 600 generates high-temperature hot air at 800-. The inner lining of the hot air branch pipe 200 is made of ceramic fiber refractory materials (resistant to 1400 ℃), the pipe diameter of the hot air branch pipe is selected according to the design specification requirement of the flow rate of high-temperature hot air, and the flow rate is usually 20-30 m/s; on the premise of reasonably meeting the requirement of reducing the material cost of the hot air branch pipes 200, the ceramic fiber modules of the lining are prevented from falling off due to the fact that the hot air flow velocity is too high and the scouring is serious, and finally, the optimal flue gas flow velocity is selected by combining the CFD flow field simulation effect of the hot air system in each hot air branch pipe so as to determine the diameter of each hot air branch pipe and ensure that the hot air of each branch pipe can be efficiently and uniformly blown into the inlet flue of the reactor.
The ammonia water spray guns 100 comprise a plurality of ammonia water spray guns 100 which are uniformly arranged on the hot air branch pipe 200, and in order to further improve the installation of the ammonia water spray guns 100, the ammonia water spray guns 100 can be arranged on the hot air branch pipe 200 at equal intervals. The high-temperature hot air and the ammonia water are conveniently mixed and contacted to heat and evaporate the ammonia water, and the ammonia gas generated after evaporation is uniformly sprayed into the inlet flue 300 of the reactor by using the nozzles arranged on the hot air branch pipes 200. The caliber of the hot air nozzle 201 is selected to be proper in diameter according to the jet flow speed required by the design specification of the ammonia-spraying grid nozzle, and the jet flow speed is usually 20-25 m/s; meanwhile, the size of the hot air nozzle 201 and the distance between the nozzles are finally determined on the premise of meeting the optimal velocity flow field and the temperature flow field distribution of the flue gas by combining the static mixer 301 area in the reactor inlet flue 300 after the hot air nozzle 201 is set and the CFD flow field simulation effect of the flue gas system in the whole reactor inlet flue 300.
At 180m2For denitration of flue gas of a sintering machine, for example, 8 hot air branch pipes 200 are provided, and each hot air branch pipe 200 is provided with 3 hot air nozzles 201. Selecting the most reasonable ejection flow rate of the hot air nozzle 201, and selecting phi 350-phi 400mm as the most appropriate caliber of the hot air nozzle 201 through detailed calculation; meanwhile, according to the actual arrangement condition of the on-site SCR reactor, the distance between the hot air nozzles 201 is most suitable for selecting 1000-1200mm in combination with the size of the inlet flue 300 of the reactor; the hot air branch pipes 200 and the hot air nozzles 201 which are uniformly arranged after accurate calculation are adopted, so that the uniformity of hot air and ammonia gas entering in the cross section of the reactor inlet flue 300 is ensured, and the utilization rate of ammonia gas and the denitration efficiency of the SCR denitration system are improved.
In order to ensure the working pressure of the spray gun and realize the optimal atomization effect of the ammonia water, the pretreatment device for SCR denitration of sintering flue gas further comprises a pressure gauge 501 and a second flow meter 401, wherein the pressure gauge 501 is arranged on a pipeline between the air assembly 500 and the second input end 102. The second flow meter 401 is disposed on the conduit between the ammonia water module 400 and the first input 101. The pressure gauge 501 is used for monitoring the pressure of compressed air, and real-time flow adjustment is performed through pressure feedback and combination of the second flowmeter 401, so that the working pressure of the spray gun is ensured, and the optimal atomization effect of ammonia water is realized. The second flowmeter 401 is preferably a rotor flowmeter, so that the investment cost and the operating cost of the sintering flue gas SCR denitration pretreatment device are reduced.
The full mixing of the ammonia gas and the sintering flue gas in the reactor inlet flue 300 is enhanced, and the static mixer 301 is arranged in the reactor inlet flue 300. Through static mixer 301, the sintering flue gas produces violent air current that circles round on its surface when passing through, can promote the high-efficient evaporation of aqueous ammonia and ammonia nitrogen misce bene effectively, promotes the utilization ratio of ammonia, reduces the system ammonia escape. Preferably: the plurality of static mixers 301 are respectively arranged in the reactor inlet flue 300. In this embodiment, a two-stage disc type static mixer 301 is disposed in the inlet flue 300 of the reactor, and when the sintering flue gas passes through, a violent swirling airflow is generated on the surface of the sintering flue gas, so that the sufficient mixing of the ammonia gas and the sintering flue gas is enhanced.
The ammonia water spray gun 100 is directly communicated with the hot air branch pipe 200 at the outlet of the hot air furnace 600, the hot air furnace 600 generates high-temperature hot air of 900 ℃ by burning blast furnace fuel gas, the high-temperature hot air is blown into an SCR denitration system through the hot air branch pipe 200 and a reactor inlet flue 300, when ammonia water is sprayed into the hot air branch pipe 200 through the ammonia water spray gun 100, high-temperature hot air of 900 ℃ is mixed and contacted with the ammonia water, the pretreatment device for SCR denitration of sintering flue gas, provided by the invention, has a simple structure, does not need to independently arrange an ammonia water evaporator, an ammonia spraying grid, a dilution fan, a matched pipeline and the like, has low investment cost and running cost, can fully realize efficient evaporation of ammonia water and uniform injection of ammonia gas into the inlet flue 300 of the reactor, and realizes efficient and uniform mixing of ammonia nitrogen in the inlet flue 300 of the reactor; therefore, the problems that an SCR denitration system in the prior art needs to be provided with parts such as an ammonia evaporator, an ammonia spraying grid, a dilution fan, a matched pipeline and the like independently, the operation failure rate is high, and the investment cost and the operation cost are high are solved. The pretreatment device for SCR denitration of sintering flue gas provided by the embodiment does not need to be provided with an ammonia water evaporator, an ammonia spraying grid, a dilution fan and a matched pipeline, valve and electric control system separately, and is used for 180m2The denitration system of the sintering machine is taken as an example, so that about 30 ten thousand of investment cost can be reduced, and the failure rate of the system can be effectively reduced; the pretreatment device for sintering flue gas SCR denitration provided by the embodiment can enable an SCR denitration system to operate stably, and the operation energy consumption is low: the sintering flue gas SCR denitration pretreatment device is perfectly combined with a hot air heating system, and no power equipment is additionally arranged, so that the sintering flue gas SCR denitration pretreatment device is 18Taking a 0m2 sintering machine denitration system as an example, if a conventional ammonia water evaporation device is adopted, the electric power of a matched dilution fan is 132KW (monomer); by adopting the sintering flue gas SCR denitration pretreatment device, a dilution fan is not required to be arranged, and the running power consumption of an SCR denitration system can be reduced by 110 KW.h/h.
Moreover, at least one path of compressed air is set to be input and blown as cold air through the second input end 102, so that the ammonia water spray gun 100100 is cooled and protected, and the stability of the operation of the sintering flue gas SCR denitration pretreatment device is ensured.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a processing apparatus before sintering flue gas SCR denitration, its characterized in that, processing apparatus before sintering flue gas SCR denitration includes reactor entry flue, hot-blast branch pipe and aqueous ammonia spray gun, a plurality of groups hot-blast branch pipe with reactor entry flue is linked together, just hot-blast branch pipe with the one end that reactor entry flue is connected stretches into in the reactor entry flue, hot-blast branch pipe stretch into extremely be provided with the hot blast nozzle that the equidistant setting of a plurality of in the part in the reactor entry flue, the aqueous ammonia spray gun has output, first input and second input, the output with hot-blast branch pipe is linked together, the aqueous ammonia is inserted to first input, second input compressed air.
2. The pretreatment device for SCR denitration of sintering flue gas as claimed in claim 1, wherein the range of the distance between the adjacent hot air nozzles is 1000-1200 mm; the aperture of the plurality of hot air nozzles is in the range of 350-400 mm.
3. The pretreatment device for SCR denitration of sintering flue gas according to claim 1, wherein a static mixer is arranged in the inlet flue of the reactor.
4. The pretreatment device for SCR denitration of sintering flue gas as claimed in claim 1, further comprising a hot blast stove, a gas pipeline and a gas regulating valve, wherein the hot blast stove is communicated with the hot blast branch pipe, the hot blast stove is connected with gas through the gas pipeline, and the gas regulating valve is arranged on the gas pipeline and used for regulating the flow of the gas entering the hot blast stove.
5. The pretreatment device for SCR denitration of sintering flue gas as set forth in claim 4, further comprising a first flow meter installed on the gas pipeline.
6. The pretreatment device for SCR denitration of sintering flue gas as claimed in any one of claims 1 to 5, further comprising a temperature detection device, wherein the temperature detection device is mounted on the hot air branch pipe and is positioned between a communication position of the ammonia water spray gun and the hot air branch pipe and a communication position of the hot air branch pipe and the reactor inlet flue.
7. The pretreatment device for SCR denitration of sintering flue gas as claimed in claim 1, further comprising an ammonia water component and an air component, wherein the ammonia water component is communicated with the first input end through a pipeline, and the air component is communicated with the second input end through a pipeline.
8. The pretreatment device for SCR denitration of sintering flue gas as claimed in claim 7, further comprising a pressure gauge disposed on the pipe between the air assembly and the second input end.
9. The pretreatment device for SCR denitration of sintering flue gas as set forth in claim 7 or 8, further comprising a second flow meter disposed on the pipeline between the ammonia water module and the first input end.
10. The pretreatment device for SCR denitration of sintering flue gas according to claim 1, wherein the number of the hot air branch pipes ranges from 4 to 8, and the hot air branch pipes are arranged on the inlet flue of the reactor at equal intervals.
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| CN202011436130.1A CN112546863A (en) | 2020-12-10 | 2020-12-10 | Sintering flue gas SCR denitration pretreatment device |
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| CN202011436130.1A CN112546863A (en) | 2020-12-10 | 2020-12-10 | Sintering flue gas SCR denitration pretreatment device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294779A (en) * | 2021-05-28 | 2021-08-24 | 华中科技大学 | High-temperature air combustion device for ammonia gas |
| CN113586959A (en) * | 2021-05-28 | 2021-11-02 | 大唐长春第三热电厂 | Dustless dilution air ammonia supply anti-blocking system |
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| CN111811138A (en) * | 2020-07-08 | 2020-10-23 | 中钢集团天澄环保科技股份有限公司 | Low-nitrogen combustion control and ammonia spraying system of low-temperature denitration hot blast stove |
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- 2020-12-10 CN CN202011436130.1A patent/CN112546863A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111811138A (en) * | 2020-07-08 | 2020-10-23 | 中钢集团天澄环保科技股份有限公司 | Low-nitrogen combustion control and ammonia spraying system of low-temperature denitration hot blast stove |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294779A (en) * | 2021-05-28 | 2021-08-24 | 华中科技大学 | High-temperature air combustion device for ammonia gas |
| CN113586959A (en) * | 2021-05-28 | 2021-11-02 | 大唐长春第三热电厂 | Dustless dilution air ammonia supply anti-blocking system |
| CN113294779B (en) * | 2021-05-28 | 2022-10-11 | 华中科技大学 | High-temperature air combustion device for ammonia gas |
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