CN106215672A - A kind of modified model SNCR SCR combined denitration device - Google Patents

A kind of modified model SNCR SCR combined denitration device Download PDF

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Publication number
CN106215672A
CN106215672A CN201610853830.8A CN201610853830A CN106215672A CN 106215672 A CN106215672 A CN 106215672A CN 201610853830 A CN201610853830 A CN 201610853830A CN 106215672 A CN106215672 A CN 106215672A
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CN
China
Prior art keywords
spray gun
sncr
burner hearth
modified model
denitration device
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610853830.8A
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Chinese (zh)
Inventor
秦刚
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Datang Shaanxi Power Generation Co Ltd
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Datang Shaanxi Power Generation Co Ltd
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Priority to CN201610853830.8A priority Critical patent/CN106215672A/en
Publication of CN106215672A publication Critical patent/CN106215672A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77Liquid phase processes
    • B01D53/79Injecting reactants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8621Removing nitrogen compounds
    • B01D53/8625Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/90Injecting reactants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/20Reductants
    • B01D2251/206Ammonium compounds
    • B01D2251/2067Urea
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention discloses a kind of modified model SNCR SCR combined denitration device, relate to denitrating flue gas field, including urea liquid preparation system, burner hearth, connect flue and reactor, described connection flue includes the horizontal segment being connected with burner hearth and the vertical section being connected with reative cell, reactor bottom is provided with outlet, described exit is provided with exhaust pass, described inboard wall of burner hearth is provided with spray gun group, reversal chamber it is provided with inside burner hearth, described reversal chamber inwall is provided with supplementary spray gun, described urea liquid preparation system is arranged on outside burner hearth, urea liquid preparation system is connected with spray gun group by SNCR metering device, urea liquid preparation system is connected with supplementary spray gun by supplementary metering device, the invention provides a kind of combined denitration device saving reducing agent and energy flexible.

Description

A kind of modified model SNCR-SCR combined denitration device
Technical field
The present invention relates to denitrating flue gas field, be specifically related to a kind of modified model SNCR-SCR combined denitration device.
Background technology
Along with expanding economy, the discharge capacity of nitrogen oxides (NOx) pollutant increases sharply, the ecological ring of severe contamination Border, it has also become one of key factor of restriction economic development, wherein coal-burning boiler because of its discharge capacity is big and Relatively centralized, relatively other Spread source is easily controlled, and becomes the preferred object controlling nitrogen oxides (NOx).
At present, denitrating flue gas nitrogen oxides (NOx), wet method removing NOx and dry removal can be divided into according to Processing tecchnics NOx, wherein conventional dry removal NOx are also divided into selective catalytic reduction (SCR) and SNCR method (SNCR).CFBB (CFB) technology is the high-efficiency low-pollution cleaning burning developed rapidly in recent ten years Branch art.This technology has obtained widespread commercial use in the field such as station boiler, Industrial Boiler in the world, for CFB pot For stove, owing to temperature field is stable, original NOx concentration is low, and SNCR technology (SNCR) processes its flue gas Middle NOx is widely used.
In recent years, a kind of SNCR/SCR mixing denitrating technique was occurred in that, it is possible to realize SNCR/ in a system The combination of SCR, discloses a kind of coal-burning boiler SNCR and SCR connection in the patent documentation of Publication No. CN101773781A Close the implementation method of denitration, fire coal boiler fume passage is arranged reducing agent spray gun, arrange in boiler back end ductwork and load There is the SCR reactor of SCR catalyst, after reducing agent enters exhaust gases passes, occur SNCR to react with flue gas, remain afterwards Through SCR reactor, there is SCR reaction at catalyst surface, this technique improves SNCR reaction in reducing agent and flue gas During the utilization rate of reducing agent, comprehensive denitration efficiency is high, transforms convenient and easy, above-mentioned technology in existing Denitration in Boiler technology In, reducing agent resolves into ammonia after entering exhaust gases passes, ammonia and nitrogen oxides occur reduction reaction further, and SNCR occurs After reaction, the ammonia of the most a small amount of (concentration about 5-30ppm) has neither part nor lot in reaction and flows out with flue gas, referred to as the escaping of ammonia, ammonia Escapement ratio is not unrestricted increasing, and only up to reach 40ppm, cause rear end SCR denitration efficiency by ammonia concentration Limiting, denitrating flue gas is incomplete;In this technology, improving SCR denitration efficiency must realize by improving the escaping of ammonia rate, and The raising of the escaping of ammonia rate needs the reducing agent consumption increasing by 3 to 6 times to generate, and substantially increases plant running cost;This Outward, the escaping of ammonia rate has randomness in SNCR course of reaction, it is impossible to controls the ammonia amount of actual participation SCR reaction, leads The comprehensive denitration efficiency causing mixing method is difficult to be realized by control system.
Chinese patent literature CN103638805A discloses the CFB boiler SNCR denitrating flue gas of a kind of dual reducting agents Method, including, when cyclone inlet flue gas temperature more than 850 DEG C, or, CFB boiler load 70%BMCR with Time upper, selected to spray into conventional ammonia reducing agent, when cyclone inlet flue gas temperature is low from cyclone inlet flue In 850 DEG C, or, when CFB boiler load is less than 70% BMCR, select from upper furnace, cyclone inlet flue Spray into produce the reducing agent of active ammonia component with in separator outlet flue or many places.Use above-mentioned spray regime During injection reducing agent, owing to fire box temperature height makes it require higher to the fire resistance rating of ejector, so that injection apparatus cost Improving, further, since the inner space of burner hearth is limited, when spraying liquid reducing agent, reducing agent is likely to result in water after spraying into Easily cause corrosion after the boiler interior conduit contact injection drops such as cold wall, even produce explosion.
Therefore, in the SNCR/SCR mixing denitrating technique of prior art, there is SCR section denitration efficiency low, or SCR Section denitration efficiency height then reducing agent usage amount is many, and comprehensive denitration efficiency is difficult to the shortcoming realized by control system.
Summary of the invention
It is an object of the invention to provide a kind of modified model SNCR-SCR combined denitration device, to solve in prior art The above-mentioned multinomial defect caused.
A kind of modified model SNCR-SCR combined denitration device, including urea liquid preparation system, burner hearth, connect flue and Reactor, described connection flue includes the horizontal segment being connected with burner hearth and the vertical section being connected with reative cell, at the bottom of reactor Portion is provided with outlet, and described exit is provided with exhaust pass, and described inboard wall of burner hearth is provided with spray gun group, is provided with reversal chamber inside burner hearth, Described reversal chamber inwall is provided with supplementary spray gun, and described urea liquid preparation system is arranged on outside burner hearth, and urea liquid preparation is System is connected with spray gun group by SNCR metering device, and urea liquid preparation system is by supplementary metering device and supplementary spray gun phase Connecting, described furnace chamber inwall is provided with burner.
Preferably, described spray gun group includes that the spaced apart horizontal spray gun group of horizontal direction and vertical direction are spaced apart Vertically spray gun group.
Preferably, the position corresponding with vertical spray gun group is provided with superheater and reheater in described furnace chamber, superheater and Reheater is connected.
Preferably, it is horizontally installed with economizer in described furnace chamber.
Preferably, the vertical section of described connection flue is provided with flow equalizing and guiding assembly of selective catalyctic reduction, described flow equalizing and guiding assembly of selective catalyctic reduction include by under Supreme gas approach, intersection deflector, water conservancy diversion lattice and the exhanst gas outlet set gradually, described water conservancy diversion lattice upper surface is provided with some pieces Riser.
Preferably, the position that the vertical section of described connection flue is positioned at above flow equalizing and guiding assembly of selective catalyctic reduction is provided with deflector.
Preferably, flow straightening grid, baffle plate and catalyst layer, described baffle plate from top to bottom it are disposed with in described reactor On be arranged at intervals with several instrument connections.
It is an advantage of the current invention that: this kind of modified model SNCR-SCR combined denitration device, make SNCR device remain relatively low NH3 and NOx stoichiometric proportion, reduce ammonia slip concentration;Increasing by one group at reversal chamber and supplement spray gun, in utilizing stove, heat smoke is straight Connecing pyrolysis section carbamide, supplement the reducing agent (NH3) required for the SCR device of rear portion, a whole set of denitrification apparatus saves going back of 15-20% Former dose of consumption, the adjustment of denitration efficiency will be the most flexible simultaneously, can individually adjust the denitration effect of SNCR device or SCR device Rate.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of modified model SNCR-SCR combined denitration device of the present invention.
Fig. 2 is the structural representation of flow equalizing and guiding assembly of selective catalyctic reduction of the present invention.
Wherein: 1-urea liquid preparation system, 2-SNCR metering device, 3-supplements metering device, 4-burner, 5-stove Thorax, 6-spray gun group, 7-superheater, 8-reheater, 9-economizer, 10-reversal chamber, 11-supplements spray gun, 12-horizontal segment, and 13-is equal Stream guiding subassembly, 14-deflector, 15-flow straightening grid, 16-instrument connection, 17-catalyst layer, 18-exhaust pass, 19-reactor, The vertical section of 20-, 21-exhanst gas outlet, 22-riser, 23-water conservancy diversion lattice, 24-intersects deflector, 25-gas approach.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and be easy to understand with effect, below in conjunction with Detailed description of the invention, is expanded on further the present invention.
As depicted in figs. 1 and 2, a kind of modified model SNCR-SCR combined denitration device, including urea liquid preparation system 1, Burner hearth 5, connect flue and reactor 19, described connection flue include the horizontal segment 12 that is connected with burner hearth 5 and with reative cell phase The vertical section 20 connected, is provided with outlet bottom reactor 19, described exit is provided with exhaust pass 18, and described burner hearth 5 inwall sets Having spray gun group 6, burner hearth 5 is internal is provided with reversal chamber 10, and described reversal chamber 10 inwall is provided with supplementary spray gun 11, described urea liquid Preparation system 1 is arranged on outside burner hearth 5, and urea liquid preparation system 1 is connected with spray gun group 6 by SNCR metering device 2, carbamide Solution preparation system 1 is connected with supplementary spray gun 11 by supplementary metering device 3, and described furnace chamber inwall is provided with burner 4.
Wherein, described spray gun group 6 includes that the spaced apart horizontal spray gun group 6 of horizontal direction and vertical direction are spaced apart Vertically spray gun group 6.
Wherein, in described furnace chamber, the position corresponding with vertical spray gun group 6 is provided with superheater 7 and reheater 8, superheater 7 It is connected with reheater 8.
Being horizontally installed with economizer 9 in it should be noted that described furnace chamber, the vertical section 20 of described connection flue is provided with all Stream guiding subassembly 13, gas approach 25 that described flow equalizing and guiding assembly of selective catalyctic reduction 13 includes setting gradually from the bottom to top, intersect deflector 24, Water conservancy diversion lattice 23 and exhanst gas outlet 21, described water conservancy diversion lattice 23 upper surface is provided with some pieces of risers 22.
At the present embodiment, the position that the vertical section 20 of described connection flue is positioned at above flow equalizing and guiding assembly of selective catalyctic reduction 13 is provided with water conservancy diversion Plate 14, is from top to bottom disposed with flow straightening grid 15, baffle plate and catalyst layer 17 in described reactor 19, on described baffle plate between Every being provided with several instrument connections 16.
Based on above-mentioned, this kind of modified model SNCR-SCR combined denitration device, economizer 9 export NH3 molar fraction increment with Supplement urea liquid flow linear, in denitrification apparatus aggregate efficiency 86.7%, the condition of the efficiency 40% of front end SNCR device Under, the stoichiometric proportion of SNCR device NH3 and NOx can control between 1.3-1.4, reduces the dry urine of a whole set of denitrification apparatus Element consumption, achieves extraordinary economic benefit.
As known by the technical knowledge, the present invention can be by other essence without departing from its spirit or the embodiment party of essential feature Case realizes.Therefore, embodiment disclosed above, for each side, all it is merely illustrative, is not only.Institute The change within the scope of the present invention or within being equal to the scope of the present invention is had all to be included in the invention.

Claims (7)

1. a modified model SNCR-SCR combined denitration device, it is characterised in that include urea liquid preparation system, burner hearth, company Cigarette receiving road and reactor, described connection flue includes the horizontal segment being connected with burner hearth and the vertical section being connected with reative cell, Reactor bottom is provided with outlet, and described exit is provided with exhaust pass, and described inboard wall of burner hearth is provided with spray gun group, is provided with inside burner hearth Reversal chamber, described reversal chamber inwall is provided with supplementary spray gun, and described urea liquid preparation system is arranged on outside burner hearth, urea liquid Preparation system is connected with spray gun group by SNCR metering device, and urea liquid preparation system is by supplementary metering device and supplements Spray gun is connected, and described furnace chamber inwall is provided with burner.
A kind of modified model SNCR-SCR combined denitration device the most according to claim 1, it is characterised in that: described spray gun Group includes the spaced apart horizontal spray gun group of horizontal direction and the spaced apart vertical spray gun group of vertical direction.
A kind of modified model SNCR-SCR combined denitration device the most according to claim 2, it is characterised in that: described furnace chamber The interior position corresponding with vertical spray gun group is provided with superheater and reheater, and superheater and reheater is connected.
A kind of modified model SNCR-SCR combined denitration device the most according to claim 1, it is characterised in that: described furnace chamber Inside it is horizontally installed with economizer.
A kind of modified model SNCR-SCR combined denitration device the most according to claim 1, it is characterised in that: described connection The vertical section of flue is provided with flow equalizing and guiding assembly of selective catalyctic reduction, gas approach that described flow equalizing and guiding assembly of selective catalyctic reduction includes setting gradually from the bottom to top, Intersection deflector, water conservancy diversion lattice and exhanst gas outlet, described water conservancy diversion lattice upper surface is provided with some pieces of risers.
A kind of modified model SNCR-SCR combined denitration device the most according to claim 5, it is characterised in that: described connection The position that the vertical section of flue is positioned at above flow equalizing and guiding assembly of selective catalyctic reduction is provided with deflector.
A kind of modified model SNCR-SCR combined denitration device the most according to claim 1, it is characterised in that: described reaction From top to bottom it is disposed with flow straightening grid, baffle plate and catalyst layer in device, described baffle plate is arranged at intervals with several tests Hole.
CN201610853830.8A 2016-09-27 2016-09-27 A kind of modified model SNCR SCR combined denitration device Pending CN106215672A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107433130A (en) * 2017-09-01 2017-12-05 北京晨晰环保工程有限公司 A kind of SCR flue gas denitration reactors of deflector optimization
CN107875851A (en) * 2017-11-08 2018-04-06 山东奥能电力科技有限公司 A kind of self catalyzed reduction denitrating system applied to full load denitrating flue gas
CN108786440A (en) * 2018-05-14 2018-11-13 新疆天富集团有限责任公司 A kind of the coupling denitrification apparatus and method of denitration of the wide load condition of coal-powder boiler
CN110487695A (en) * 2019-07-08 2019-11-22 佛山市顺德区阿波罗环保器材有限公司 Strainability detection system of fume filtering element
CN111558286A (en) * 2020-05-12 2020-08-21 江苏峰峰鸿运环保科技发展有限公司 SNCR-SCR combined denitration method and device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102861511A (en) * 2012-09-28 2013-01-09 南京龙源环保有限公司 SNCR (selective non-catalytic reduction) and SCR (selective catalytic reduction) combined denitration method and SNCR and SCR combined denitration device for flue gas of coal-fired boiler
CN202844885U (en) * 2012-09-28 2013-04-03 南京龙源环保有限公司 Smoke SNCR (Selective Non-Catalytic Reduction) and SCR (Selective Catalytic Reduction) combined denitrification device for coal-fired boiler

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102861511A (en) * 2012-09-28 2013-01-09 南京龙源环保有限公司 SNCR (selective non-catalytic reduction) and SCR (selective catalytic reduction) combined denitration method and SNCR and SCR combined denitration device for flue gas of coal-fired boiler
CN202844885U (en) * 2012-09-28 2013-04-03 南京龙源环保有限公司 Smoke SNCR (Selective Non-Catalytic Reduction) and SCR (Selective Catalytic Reduction) combined denitrification device for coal-fired boiler

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107433130A (en) * 2017-09-01 2017-12-05 北京晨晰环保工程有限公司 A kind of SCR flue gas denitration reactors of deflector optimization
CN107875851A (en) * 2017-11-08 2018-04-06 山东奥能电力科技有限公司 A kind of self catalyzed reduction denitrating system applied to full load denitrating flue gas
CN107875851B (en) * 2017-11-08 2020-11-24 山东奥淼科技发展有限公司 Be applied to full-load flue gas denitration's self-catalytic reduction deNOx systems
CN108786440A (en) * 2018-05-14 2018-11-13 新疆天富集团有限责任公司 A kind of the coupling denitrification apparatus and method of denitration of the wide load condition of coal-powder boiler
CN110487695A (en) * 2019-07-08 2019-11-22 佛山市顺德区阿波罗环保器材有限公司 Strainability detection system of fume filtering element
CN111558286A (en) * 2020-05-12 2020-08-21 江苏峰峰鸿运环保科技发展有限公司 SNCR-SCR combined denitration method and device

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Application publication date: 20161214