CN109966899B - Groove type mixer device for realizing efficient SNCR denitration of pulverized coal boiler flue gas - Google Patents
Groove type mixer device for realizing efficient SNCR denitration of pulverized coal boiler flue gas Download PDFInfo
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- CN109966899B CN109966899B CN201910376523.9A CN201910376523A CN109966899B CN 109966899 B CN109966899 B CN 109966899B CN 201910376523 A CN201910376523 A CN 201910376523A CN 109966899 B CN109966899 B CN 109966899B
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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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- 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
- B01D53/78—Liquid phase processes with gas-liquid contact
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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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Abstract
The invention provides a trough type mixer device for realizing high-efficiency SNCR denitration of pulverized coal boiler flue gas, which comprises a trough type mixer arranged between a hearth outlet flue and a downstream flue, wherein the trough type mixer at least comprises two layers of trough type mixer bodies, and each layer of trough type mixer body comprises a plurality of trough type steels which are equidistantly arranged; the invention realizes higher SNCR denitration efficiency, thereby greatly reducing the concentration of NOx in front of the pulverized coal boiler SCR device, being beneficial to reducing the dosage of SCR catalyst, prolonging the service life of the catalyst, reducing the cost of catalyst replacement and disposal, and generating good economic benefit.
Description
Technical Field
The invention belongs to the technical field of environmental protection of coal-fired boilers, and particularly relates to a groove type mixer device for realizing efficient SNCR denitration of pulverized coal boiler flue gas.
Background
Along with the increasingly prominent environmental problems, the national environmental protection policy is more stringent, and the emission concentration of NOx of the coal-fired unit is required to be lower than 50mg/Nm in the 'coal-electricity energy conservation, emission reduction and upgrading and reformation action plan 2014-2020' issued in 2014 3 . Selective non-catalytic reduction SNCR denitration technology has been widely used on circulating fluidized bed CFB as a flue gas denitration technology that is widely used next to SCR.
If the SNCR denitration technology is applied to a pulverized coal boiler, the reducing agent is sprayed in a hearth of the pulverized coal boiler as introduced in related documents, and the denitration efficiency is lower by less than 30% at most due to the reasons of high smoke temperature, poor mixing effect and the like, so that the SNCR denitration technology is less applied to the flue gas denitration of the pulverized coal boiler.
Disclosure of Invention
The invention aims to provide a groove type mixer device for realizing high-efficiency SNCR denitration of pulverized coal boiler flue gas, which solves the problem of low denitration efficiency in the prior art that a selective non-catalytic reduction denitration technology is applied to the denitration of pulverized coal boiler flue gas.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a trough type mixer device for realizing high-efficiency SNCR denitration of pulverized coal boiler flue gas, which comprises a trough type mixer arranged between a hearth outlet flue and a downstream flue, wherein the trough type mixer at least comprises two layers of trough type mixer bodies, and each layer of trough type mixer body comprises a plurality of trough type steels which are equidistantly arranged.
Preferably, the open ends of the channel steel on the first layer of the channel type mixer body are arranged opposite to the open ends of the channel steel on the rest layer of the channel type mixer body.
Preferably, a runner is formed between two adjacent groove-shaped steel which are arranged in the same layer; the center line of the groove-shaped steel of the later layer of groove-shaped mixer body coincides with the center line of the runner formed by the groove-shaped steel of the former layer of groove-shaped mixer body.
Preferably, a first screen heat exchanger is arranged at the flue opening of the hearth outlet flue, and the first screen heat exchanger is arranged at the upstream of the trough type mixer.
Preferably, an SNCR pneumatic spray gun is disposed between the first screen heat exchanger and the tank mixer.
Preferably, a second screen heat exchanger is also arranged downstream of the tank mixer.
Preferably, the channel steel has a height of 300mm, a leg width of 89mm, a waist thickness of 11.5mm, and an average leg thickness of 13.5mm.
Preferably, the through-flow distance between two adjacent groove-shaped steel arranged on the same layer is 123mm; the distance between the upper surface of the open end of the groove-shaped steel of the first layer of groove-shaped mixer body and the upper surface of the open end of the groove-shaped steel of the second layer of groove-shaped mixer body is 61.5mm; the interval between the lower surface of the open end of the groove-shaped steel of the first layer of groove-shaped mixer body and the lower surface of the open end of the groove-shaped steel of the second layer of groove-shaped mixer body is 61.5mm;
the through-flow distance between the bottom of the first layer groove type mixer body groove type steel and the end of the opening end of the second layer groove type mixer groove type steel is 39-78 mm.
Compared with the prior art, the invention has the beneficial effects that:
according to the groove type mixer device for realizing high-efficiency SNCR denitration of the pulverized coal boiler flue gas, high-temperature flue gas enters the groove type mixer, the flue gas is accelerated in the groove type mixer, a reflux zone is formed at the inner corner of the groove type mixer, and evaporation of reducing agent fogdrops and interaction between evaporation products and the flue gas are promoted. Meanwhile, due to the difference of the flow area of the outlet of the groove type mixer and the downstream flue connected with the outlet of the groove type mixer, the flue gas and the reducing agent can be further mixed due to the change of speed after entering the downstream flue, namely, the use of the groove type mixer can enable the reducing agent to realize good mixing effect under a shorter flowing distance, and the deep SNCR denitration can be promoted;
meanwhile, if the full mixing of the reducing agent and the flue gas can be realized quickly, the auto-oxidation 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 reducing NOx is improved. Under the condition of proper ammonia nitrogen molar ratio and rapid and uniform mixing of the flue gas/reducing agent, the SNCR denitration efficiency of high-temperature flue gas reaching 1000 ℃ can generally reach 60% -70%, and the highest denitration efficiency can be close to 80%;
the invention realizes higher SNCR denitration efficiency, thereby greatly reducing the concentration of NOx in front of the pulverized coal boiler SCR device, being beneficial to reducing the dosage of SCR catalyst, prolonging the service life of the catalyst, reducing the cost of catalyst replacement and disposal, and generating good economic benefit.
Drawings
FIG. 1 is a layout of a trough mixer device according to the present invention in a pulverized coal boiler flue;
FIG. 2 is a top view of a tank mixer arrangement in a pulverized coal boiler flue;
FIG. 3 is a diagram of a channel steel used to construct a channel mixer;
fig. 4 is a layout of a channel steel in a channel mixer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the tank type mixer device for realizing high-efficiency SNCR denitration of pulverized coal boiler flue gas provided by the invention comprises a hearth outlet flue 1, a first screen type heat exchanger 2, an SNCR pneumatic type spray gun 3, a tank type mixer 4, a second screen type heat exchanger 6 and a downstream flue 5, wherein the first screen type heat exchanger 2, the SNCR pneumatic type spray gun 3, the tank type mixer 4 and the second screen type heat exchanger 6 are sequentially arranged in an inner cavity of the hearth outlet flue 1 of the pulverized coal boiler.
As shown in fig. 3, the basic component unit of the tank mixer 4 is a tank steel 6, the tank steel 6 is made of 310S stainless steel, and the key dimensions of the tank steel 6 are height, waist thickness, average leg thickness and leg width, which can be customized by using standard tank steel members or according to optimized simulation data. The specific size of the groove-shaped steel 6 of the groove-shaped mixer 4 suitable for high-efficiency SNCR denitration of the large-scale pulverized coal boiler flue gas can be selected as follows: the height H of the groove-shaped steel 6 is 300mm, the leg width W is 89mm, the waist thickness D is 11.5mm, the average leg thickness D is 13.5mm, and the length L is determined according to the height of the downstream flue 5.
As shown in fig. 4, the tank mixer 4 comprises at least two layers of tank mixer bodies, each layer of tank mixer body comprises a plurality of tank steel 6 which are equidistantly arranged; a runner is formed between two adjacent groove-shaped steel 6 arranged on the same layer.
The open end of the groove-shaped steel 6 on the first layer groove-shaped mixer body is arranged opposite to the open end of the groove-shaped steel on the residual layer groove-shaped mixer body.
The center line of the groove-shaped steel 6 of the groove-shaped mixer body of the later layer is coincident with the center line of the runner formed by the groove-shaped steel 6 of the groove-shaped mixer body of the former layer.
In this embodiment, the tank mixer 4 adopts a two-layer structure, in which the first-layer tank mixer body tank steel 6 is equidistantly arranged, the second-layer tank mixer body tank steel 6 is fastened to the first-layer tank mixer body tank steel 6, and when the two-layer tank mixer is arranged, the center line of the second-layer tank mixer body tank steel 6 coincides with the center line of the flow channel formed by the first-layer tank mixer body.
The through-flow distance L3 of the groove-shaped steel 6 arranged on the same layer is 123mm, the upper surface and the lower surface of the opening end of the groove-shaped steel 6 of the first layer of groove-shaped mixer body are respectively equal to the distance L2 between the upper surface and the lower surface of the opening end of the groove-shaped steel 6 of the second layer of groove-shaped mixer body, the through-flow distance L3 is 61.5mm, the through-flow distance in the groove-shaped steel 6 is kept constant as much as possible, and the high-speed flue gas is prevented from flowing in the groove-shaped steel due to the change of the flow passage area to generate larger pressure loss.
The second-layer groove type mixer body groove type steel 6 is inserted into the first-layer groove type mixer body groove type steel, and the groove bottom through flow distance L1 of the second-layer groove type mixer body groove type steel 6 is 39-78 mm, wherein specific values depend on the balance between the expected SNCR denitration efficiency and the flow resistance.
In this embodiment, the tank mixer 4 adopts a three-layer structure, in which the first-layer tank mixer body tank steel 6 is equidistantly arranged, the second-layer tank mixer body tank steel 6 is fastened to the first-time tank mixer body tank steel 6, and the third-layer tank mixer body tank steel 6 is fastened to the first-time tank mixer body tank steel 6.
When the groove type steel is arranged, the center line of the groove type steel 6 of the second layer of groove type mixer body coincides with the center line of a flow channel formed by the first layer of groove type mixer body; the center line of the groove-shaped steel 6 of the third layer groove-shaped mixer body coincides with the center line of the flow channel formed by the second layer groove-shaped mixer body.
The through-flow distance L1 between the end of the open end of the third-layer tank type mixer body tank type steel 6 and the bottom of the second-layer tank type mixer body tank type steel 6 is 39-78 mm.
The through-flow distance L4 between the upper surface of the third-layer tank type mixer body tank type steel 6 and the center line of the second-layer tank type mixer body tank type steel 6 was 61.5mm.
An SNCR pneumatic spray gun 3 is arranged at the downstream of the screen heat exchanger 2 of the hearth outlet flue 1 of the pulverized coal boiler and is used for spraying SNCR denitration reducing agent solution such as ammonia water or urea solution and the like into the hearth outlet flue 1. The reducing agent fog drops after pneumatic crushing start to evaporate under the wrapping and clamping action of high-temperature flue gas and enter the tank mixer 4, the flue gas is accelerated in the tank mixer 4, and a reflux area is formed at the inner corner of the tank mixer 4, so that the evaporation of the reducing agent fog drops and the interaction between evaporation products and the flue gas are promoted. Meanwhile, due to the difference of the flow area of the outlet of the groove type mixer 4 and the downstream flue 5 connected with the outlet, the flue gas and the reducing agent can be further mixed after entering the downstream flue 5 due to the change of speed, namely, the use of the groove type mixer 4 can enable the reducing agent to achieve good mixing effect under a shorter flow distance, and the SNCR denitration depth can be promoted.
Claims (6)
1. The groove type mixer device for realizing high-efficiency SNCR denitration of the pulverized coal boiler flue gas is characterized by comprising groove type mixers (4) arranged between a hearth outlet flue (1) and a downstream flue (5), wherein each groove type mixer (4) adopts a three-layer structure groove type mixer body, and each groove type mixer body comprises a plurality of groove type steels (6) which are equidistantly arranged;
the open end of the groove-shaped steel (6) on the first layer groove-shaped mixer body is arranged opposite to the open end of the groove-shaped steel (6) on the rest layer groove-shaped mixer body;
a runner is formed between two adjacent groove-shaped steel (6) which are arranged on the same layer; the center line of the groove-shaped steel (6) of the later layer of groove-shaped mixer body coincides with the center line of the runner formed by the groove-shaped steel (6) of the former layer of groove-shaped mixer body;
the first layer of groove type mixer body groove type steel (6) is equidistantly arranged, the second layer of groove type mixer body groove type steel (6) is in buckling arrangement with the first layer of groove type mixer body groove type steel (6), and the third layer of groove type mixer body groove type steel (6) is in buckling arrangement with the first layer of groove type mixer body groove type steel (6).
2. The tank type mixer device for realizing high-efficiency SNCR (selective non-catalytic reduction) denitration of pulverized coal boiler flue gas according to claim 1 is characterized in that a first screen type heat exchanger (2) is arranged at a flue opening of a hearth outlet flue (1), and the first screen type heat exchanger (2) is arranged at the upstream of the tank type mixer (4).
3. The tank type mixer device for realizing high-efficiency SNCR denitration of pulverized coal boiler flue gas according to claim 2, wherein an SNCR pneumatic spray gun (3) is arranged between the first screen type heat exchanger (2) and the tank type mixer (4).
4. A tank mixer device for achieving efficient SNCR denitration of pulverized coal boiler flue gas according to claim 1, characterized in that a second screen heat exchanger is also arranged downstream of the tank mixer (4).
5. The tank mixer device for realizing high-efficiency SNCR denitration of pulverized coal boiler flue gas according to claim 1, wherein the height of the tank steel (6) is 300mm, the leg width is 89mm, the waist thickness is 11.5mm, and the average leg thickness is 13.5mm.
6. The tank mixer device for realizing high-efficiency SNCR denitration of pulverized coal boiler flue gas according to claim 1, wherein the through-flow distance between two adjacent tank steels (6) which are arranged on the same layer is 123mm; the distance between the upper surface of the open end of the first layer of groove-type mixer body groove-type steel (6) and the upper surface of the open end of the second layer of groove-type mixer body groove-type steel (6) is 61.5mm; the interval between the lower surface of the open end of the first layer of groove-type mixer body groove-type steel (6) and the lower surface of the open end of the second layer of groove-type mixer body groove-type steel (6) is 61.5mm;
the through-flow distance between the bottom of the first-layer groove type mixer body groove type steel (6) and the end part of the opening end of the second-layer groove type mixer groove type steel (6) is 39-78 mm.
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| CN201910376523.9A CN109966899B (en) | 2019-05-07 | 2019-05-07 | Groove type mixer device for realizing efficient SNCR denitration of pulverized coal boiler flue gas |
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| CN111420541A (en) * | 2020-04-29 | 2020-07-17 | 华能国际电力股份有限公司 | A new type of mixer structure suitable for SNCR denitrification of high temperature flue gas of pulverized coal boiler |
| CN111420542A (en) * | 2020-04-29 | 2020-07-17 | 华能国际电力股份有限公司 | A flue mixer structure for SNCR denitrification of pulverized coal boiler flue gas |
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