CN111420541A - Novel mixer structure suitable for SNCR denitration of pulverized coal fired boiler high temperature flue gas - Google Patents
Novel mixer structure suitable for SNCR denitration of pulverized coal fired boiler high temperature flue gas Download PDFInfo
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- CN111420541A CN111420541A CN202010357746.3A CN202010357746A CN111420541A CN 111420541 A CN111420541 A CN 111420541A CN 202010357746 A CN202010357746 A CN 202010357746A CN 111420541 A CN111420541 A CN 111420541A
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- flue gas
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- pulverized coal
- sncr denitration
- flue
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J11/00—Devices for conducting smoke or fumes, e.g. flues
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- 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
- F23J15/006—Layout of treatment plant
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Environmental & Geological Engineering (AREA)
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- Health & Medical Sciences (AREA)
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- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
According to the novel mixer structure suitable for SNCR denitration of high-temperature flue gas of the pulverized coal boiler, the efficient flue gas/reducing agent mixer is constructed in the proper area in the flue of the pulverized coal boiler based on the basic mixer body, so that ideal SNCR denitration efficiency can be realized; the whole design is simple, the area of the screenless heat exchanger in the flue can be directly arranged, the change on the flue structure is small, and the influence on the operation of equipment at the downstream of the flue is small; since the flue gas is accelerated in the mixer to increase the flow resistance, the design needs to balance the flue gas flow loss and the SNCR denitration efficiency so as to obtain the ideal overall economic benefit.
Description
Technical Field
The invention relates to the technical field of coal-fired boiler environmental protection, in particular to a novel mixer structure suitable for SNCR denitration of high-temperature flue gas of a pulverized coal boiler.
Background
In order to meet the national ultra-low emission requirements of pollutants such as NOx in the flue gas emitted by a coal-fired unit, a Selective Catalytic Reduction (SCR) method is generally adopted for removing NOx in a pulverized coal boiler, and the method has the problems of high construction cost of a denitration device, high catalyst consumption, catalyst failure or poisoning, high disposal cost of waste catalyst, great potential harm to the environment and the like. If most of NOx can be removed before the flue gas enters the SCR device, the denitration pressure of the downstream SCR device can be effectively relieved, the service life of the SCR catalyst can be prolonged, and good economic and social benefits are generated.
Disclosure of Invention
The invention aims to provide a novel mixer structure suitable for SNCR (selective non-catalytic reduction) denitration of high-temperature flue gas of a pulverized coal boiler, and solves the problem of low SNCR denitration efficiency in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a novel mixer structure suitable for SNCR denitration of high-temperature flue gas of a pulverized coal boiler, which comprises at least one mixer arranged in a flue and used for SNCR denitration of the high-temperature flue gas, wherein the mixers are arranged in parallel along the radial direction of the flue.
Preferably, the mixer comprises a plurality of basic mixer bodies, wherein the basic mixer bodies are sequentially connected in series; the basic mixer body arranged at the head is connected with a flue gas inlet unit; the basic mixer body arranged at the tail part is connected with a smoke outlet unit.
Preferably, the flue gas inlet unit and the flue gas outlet unit have the same structure, wherein the flue gas inlet unit comprises two inclined baffles which are arranged in a symmetrical structure; an inclination angle is arranged between each inclined baffle and the axis of the flue; two ends of each inclined baffle are respectively connected with a first mixer baffle, and free ends of the two first mixer baffles are connected; a right-angle triangular prism shape is formed between the inclined baffle and the two first mixer baffles; the two right-angle triangular prisms are arranged in a symmetrical structure.
Preferably, the opening of the flue gas inlet unit faces the upstream of the flue gas to form a reduction-type flow passage; the opening of the smoke outlet unit faces the smoke downstream to form a gradually expanding flow channel.
Preferably, the flue gas inlet unit is arranged with a plurality of SNCR lances.
Preferably, the basic mixer body comprises two rectangular frame structures, each rectangular frame structure is provided with an opening; the two rectangular frame structures are symmetrically arranged, and the two openings are oppositely arranged; the two rectangular frame structures are connected through an I-shaped connecting piece, and two ends of the I-shaped connecting piece are arranged in the cavities of the two rectangular frame structures respectively.
Compared with the prior art, the invention has the beneficial effects that:
according to the novel mixer structure suitable for SNCR denitration of high-temperature flue gas of the pulverized coal boiler, the efficient flue gas/reducing agent mixer is constructed in the proper area in the flue of the pulverized coal boiler based on the basic mixer body, so that ideal SNCR denitration efficiency can be realized; the whole design is simple, the area of the screenless heat exchanger in the flue can be directly arranged, the change on the flue structure is small, and the influence on the operation of equipment at the downstream of the flue is small; since the flue gas is accelerated in the mixer to increase the flow resistance, the design needs to balance the flue gas flow loss and the SNCR denitration efficiency so as to obtain the ideal overall economic benefit.
Drawings
FIG. 1 is a schematic diagram of an arrangement of a plurality of mixer structures;
FIG. 2 is a top view of the basic mixer body;
FIG. 3 is a front view of the basic mixer body;
FIG. 4 is a top view of the flue gas inlet unit;
FIG. 5 is a front view of the flue gas inlet unit;
FIG. 6 is a top view of the flue gas outlet unit;
FIG. 7 is a front view of the flue gas outlet unit;
FIG. 8 is a mixer structure view constructed of a flue gas inlet unit, 2 basic mixer bodies and a flue gas outlet unit;
FIG. 9 is a view of a construction of an inclined baffle;
FIG. 10 is a diagram of a mixer baffle structure;
FIG. 11 is a plot of relative dimensions of a basic mixer body based on stack width;
the device comprises a pulverized coal boiler 1, a pulverized coal boiler 2, a flue 3, a mixer 4, an inclined baffle 5, an SNCR spray gun 6, a second mixer baffle 7, heat-resistant steel 8, a refractory wear-resistant material layer 9, a boundary baffle 10, a flue width 11, a basic unit width 12, an inlet width 13, a flow channel width 14, a flow channel width 15, a flow channel width 16, a flow channel width 17, a baffle length 18, a baffle length 19, a baffle half length 20 and a baffle length.
Detailed Description
At present, when the selective non-catalytic reduction reaction SNCR of flue gas is researched, if the reducing agent and the flue gas can be mixed well quickly, the autoxidation share of the amino reducing agent in a high-temperature environment can be effectively reduced, so that the share of the amino reducing agent for NOx reduction is improved, even if the flue gas temperature is higher, the SNCR denitration can still realize ideal denitration efficiency, for example, through experimental and simulation research, under the condition of proper ammonia nitrogen molar ratio and quick and uniform mixing of the flue gas and the reducing agent, the SNCR denitration efficiency can reach 60% -70% generally and can be close to 80% at most in the high-temperature flue gas with the temperature of 1000 ℃. On the basis of the research, aiming at the design of SNCR denitration reactors of different types, relevant comparative analysis is developed from the angles of the coverage range of an SNCR spray gun for spraying reducing agents, the width of a flue and the like, a basic mixer unit in the flue which can be repeatedly used according to the SNCR denitration requirements of flue gas of a pulverized coal boiler is designed on the basis, the design of an inlet and an outlet of a mixer which are used for promoting the evaporation of fog drops and reducing the resistance loss of the flue gas is assisted, and the mixer and the reactor which are suitable for the high-temperature flue gas high-efficiency SNCR denitration of the pulverized coal boiler are constructed; specifically, the method comprises the following steps:
as shown in fig. 1, the novel mixer structure suitable for SNCR denitration of high-temperature flue gas of a pulverized coal boiler provided by the invention comprises a pulverized coal boiler 1, a flue 2, a mixer 3, an inclined baffle 4, an SNCR spray gun 5 and a mixer baffle 6, wherein the tail of the pulverized coal boiler 1 is connected with the flue 2, and the mixer 3 for SNCR denitration of high-temperature flue gas is arranged in the flue 2.
The mixer 3 comprises a plurality of basic mixer bodies, wherein the basic mixer bodies are sequentially connected in series; the basic mixer body arranged at the head is connected with a flue gas inlet unit; the basic mixer body arranged at the tail part is connected with a smoke outlet unit.
The mixer 3 is provided with at least one mixer, and the height of the mixer is the same as that of the flue; if more than two mixers 3 are provided, the plurality of mixers 3 are arranged in parallel.
As shown in fig. 4 to 7, the flue gas inlet unit and the flue gas outlet unit have the same structure, wherein the flue gas inlet unit comprises two inclined baffles 4, and the two inclined baffles are arranged in a symmetrical structure.
An inclination angle is arranged between the inclined baffle 4 and the axis of the flue 2.
Two ends of the inclined baffle 4 are respectively connected with a first mixer baffle, and free ends of the two first mixer baffles are connected; the inclined baffle 4 and the two first mixer baffles form a right triangular prism shape therebetween.
The opening of the flue gas inlet unit faces the upstream of the flue gas; the opening of the flue gas outlet unit faces the flue gas downstream.
A plurality of SNCR spray guns 5 are arranged on the inclined baffle 4 at the flue gas inlet unit; an inclination angle is arranged between the installation direction of each SNCR spray gun 5 and the inclined baffle plate 4.
The number and arrangement mode of the spray guns required can be combined with the conditions of smoke temperature, smoke speed and the like to develop an optimized design through a numerical simulation method.
The tail part of the SNCR spray gun 5 is positioned in a closed right prism space, and a reducing agent solution pipeline passes through the wall surface of a flue above the space and enters the right prism space to be connected with the SNCR spray gun 5. The SNCR spray gun 5 can be arranged in the flue, so that the problems that the injection depth of the reducing agent solution is limited after the reducing agent solution is sprayed by the SNCR spray gun 5 can be effectively solved, and the traditional method that the SNCR spray gun 5 can only be arranged on the wall surface of the flue 2 and cannot be arranged in the flue in the SNCR denitration method is broken through.
The flue gas inlet unit forms a reduction type flow channel by two symmetrical right triangular prisms, high-temperature flue gas flows through the reduction type flow channel to be accelerated, and the high-temperature flue gas wraps reducing agent droplets sprayed from the SNCR spray gun 5 and enters the basic mixer body.
As shown in fig. 2 and 3, the basic mixer body is composed of a second mixer baffle 6, which includes two rectangular frame structures, each of which is provided with an opening; two rectangular frame structures are symmetrically arranged, and two openings are oppositely arranged.
The two rectangular frame structures are connected through an I-shaped connecting piece, and two ends of the I-shaped connecting piece are arranged in the cavities of the two rectangular frame structures respectively.
As shown in fig. 9 and 10, the inclined baffle plate 4 is made of heat-resistant steel 7, and a fireproof and wear-resistant material layer 8 is coated on one surface of the heat-resistant steel 7, which is in contact with the flue gas.
The mixer baffle is made of heat-resistant steel, and fire-resistant and wear-resistant material layers are coated on two surfaces of the heat-resistant steel.
The heat-resistant steel material is 310S stainless steel which is used as a baffle material.
After the flue gas/reducing agent enters the basic mixer body, the flue gas/reducing agent is divided into two streams of flue gas uniformly due to the obstruction of the vertical plate of the I-shaped connecting piece, and the two streams of flue gas flow to two sides respectively, and an omega-shaped flow path is continuously completed.
Because flue gas and reductant have accomplished many times and have turned to the flow in that the confined space constitutes, in the marcing of flue gas and turning to, promoted the mixing of flue gas and reductant, simultaneously, high-speed flow can form strong backward flow district in the local right angle region of U type runner, can further promote the mixing effect of flue gas and reductant in local backward flow district.
The flue gas and the reducing agent flow through a single basic mixer body to complete four times of U-shaped flow, and are intensively mixed through a plurality of local backflow regions, so that sufficient mixing and ideal SNCR denitration can be realized. If the gas flows through 2 or more basic mixer bodies, the mixing and SNCR denitration effect is better, although the flow pressure loss is also larger.
The good design of the basic mixer body with the same size as the flow channel width in fig. 8 and fig. 11 is the key to realize the low flow pressure loss and the high SNCR denitration efficiency, and the design principle should include the following points:
1. the width 10 of the flue 2 should be an integer multiple of the width 11 of the basic mixer body;
2. the width 11 of the basic mixer body should be 3 times its inlet width 12;
3. two omega-shaped runners in the basic mixer body are symmetrically distributed, and the widths 13, 14, 15 and 16 of the runners are kept consistent;
4. the length 18, 19 of the baffles in the basic mixer body is specifically determined by the number of basic mixer bodies to be used in combination and the space in the flue area where the mixer is arranged.
The invention constructs the high-efficiency flue gas/reducing agent mixer based on the basic mixer body in the proper area in the flue 2 of the pulverized coal boiler 1, and can realize ideal SNCR denitration efficiency. The whole design is simple, the area of the screenless heat exchanger in the flue 2 can be directly arranged, the change of the flue structure is small, and the influence on the operation of the downstream equipment of the flue is small. Since the flue gas is accelerated in the mixer to increase the flow resistance, the design needs to balance the flue gas flow loss and the SNCR denitration efficiency so as to obtain the ideal overall economic benefit.
Claims (6)
1. The utility model provides a novel blender structure suitable for pulverized coal boiler high temperature flue gas SNCR denitration which characterized in that, is used for high temperature flue gas SNCR denitration blender (3) including arranging in flue (2), blender (3) are provided with at least one, blender (3) are arranged side by side along the radial direction of flue (2).
2. The novel mixer structure suitable for SNCR denitration of high-temperature flue gas of a pulverized coal boiler as claimed in claim 1, wherein the mixer (3) comprises a plurality of basic mixer bodies, wherein the basic mixer bodies are sequentially connected in series; the basic mixer body arranged at the head is connected with a flue gas inlet unit; the basic mixer body arranged at the tail part is connected with a smoke outlet unit.
3. The novel mixer structure suitable for SNCR denitration of high-temperature flue gas of a pulverized coal boiler is characterized in that the flue gas inlet unit and the flue gas outlet unit have the same structure, wherein the flue gas inlet unit comprises two inclined baffles (4), and the two inclined baffles are arranged in a symmetrical structure; an inclination angle is arranged between each inclined baffle (4) and the axis of the flue (2); two ends of each inclined baffle (4) are respectively connected with a first mixer baffle, and free ends of the two first mixer baffles are connected; a right-angle triangular prism shape is formed between the inclined baffle plate (4) and the two first mixer baffle plates; the two right-angle triangular prisms are arranged in a symmetrical structure.
4. The novel mixer structure suitable for SNCR denitration of high-temperature flue gas of a pulverized coal fired boiler as recited in claim 3, wherein the opening of the flue gas inlet unit faces the upstream of the flue gas to form a reduction-type flow passage; the opening of the smoke outlet unit faces the smoke downstream to form a gradually expanding flow channel.
5. The new mixer structure for SNCR denitration of pulverized coal boiler high temperature flue gas according to claim 2, characterized in that the flue gas inlet unit is arranged with a plurality of SNCR lances (5).
6. The novel mixer structure suitable for SNCR denitration of high-temperature flue gas of a pulverized coal fired boiler as recited in claim 2, wherein the basic mixer body comprises two rectangular frame structures, each rectangular frame structure is provided with an opening; the two rectangular frame structures are symmetrically arranged, and the two openings are oppositely arranged; the two rectangular frame structures are connected through an I-shaped connecting piece, and two ends of the I-shaped connecting piece are arranged in the cavities of the two rectangular frame structures respectively.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010357746.3A CN111420541A (en) | 2020-04-29 | 2020-04-29 | Novel mixer structure suitable for SNCR denitration of pulverized coal fired boiler high temperature flue gas |
| PCT/CN2020/123327 WO2021218076A1 (en) | 2020-04-29 | 2020-10-23 | Novel mixer structure suitable for sncr denitration of high-temperature flue gas from pulverized coal boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010357746.3A CN111420541A (en) | 2020-04-29 | 2020-04-29 | Novel mixer structure suitable for SNCR denitration of pulverized coal fired boiler high temperature flue gas |
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| CN111420541A true CN111420541A (en) | 2020-07-17 |
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| CN202010357746.3A Pending CN111420541A (en) | 2020-04-29 | 2020-04-29 | Novel mixer structure suitable for SNCR denitration of pulverized coal fired boiler high temperature flue gas |
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| WO (1) | WO2021218076A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021218076A1 (en) * | 2020-04-29 | 2021-11-04 | 华能国际电力股份有限公司 | Novel mixer structure suitable for sncr denitration of high-temperature flue gas from pulverized coal boiler |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116531916B (en) * | 2023-04-21 | 2024-05-10 | 苍南玉苍伟明环保能源有限公司 | SNCR flue gas desulfurization denitration equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE10003090A1 (en) * | 2000-01-25 | 2001-07-05 | Siemens Ag | SCR catalyst apparatus for reducing nitrogen oxides, comprises two sections made from catalyst-coated grooved plates in stacked assemblies |
| DE10334593B3 (en) * | 2003-07-28 | 2005-04-21 | Framatome Anp Gmbh | mixing system |
| CN201249102Y (en) * | 2008-08-21 | 2009-06-03 | 北京国电龙源环保工程有限公司 | Flue-gas denitration vortex mixer |
| CH702279B8 (en) * | 2009-08-18 | 2011-12-30 | Flowtech Ind Ag | Static mixer. |
| CN203264550U (en) * | 2012-12-12 | 2013-11-06 | 盐城工学院 | Diversion apparatus for uniform flow field distribution of Pi type SCR denitrification reactor |
| JP6591197B2 (en) * | 2015-05-21 | 2019-10-16 | 三菱日立パワーシステムズ株式会社 | Exhaust gas mixing device |
| KR101965491B1 (en) * | 2017-06-21 | 2019-04-03 | 두산중공업 주식회사 | Exhaust gas flow splitter and boiler exhaust apparatus having the same |
| CN109966899B (en) * | 2019-05-07 | 2024-01-26 | 华能国际电力股份有限公司 | Groove type mixer device for realizing efficient SNCR denitration of pulverized coal boiler flue gas |
| CN210303177U (en) * | 2019-06-26 | 2020-04-14 | 东方电气集团东方锅炉股份有限公司 | SNCR and SCR coupling flue gas denitration device of pulverized coal furnace |
| CN111420541A (en) * | 2020-04-29 | 2020-07-17 | 华能国际电力股份有限公司 | Novel mixer structure suitable for SNCR denitration of pulverized coal fired boiler high temperature flue gas |
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2020
- 2020-04-29 CN CN202010357746.3A patent/CN111420541A/en active Pending
- 2020-10-23 WO PCT/CN2020/123327 patent/WO2021218076A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021218076A1 (en) * | 2020-04-29 | 2021-11-04 | 华能国际电力股份有限公司 | Novel mixer structure suitable for sncr denitration of high-temperature flue gas from pulverized coal boiler |
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