CN110208452A - A kind of denitrating catalyst Performance Test System and method cooperateing with allotment dust content and temperature - Google Patents

A kind of denitrating catalyst Performance Test System and method cooperateing with allotment dust content and temperature Download PDF

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Publication number
CN110208452A
CN110208452A CN201910417757.3A CN201910417757A CN110208452A CN 110208452 A CN110208452 A CN 110208452A CN 201910417757 A CN201910417757 A CN 201910417757A CN 110208452 A CN110208452 A CN 110208452A
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CN
China
Prior art keywords
flue gas
valve
temperature
denitrating catalyst
allotment
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Pending
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CN201910417757.3A
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Chinese (zh)
Inventor
黄斐鹏
童小忠
王洁
陈臻
余一凡
王维平
陈雨帆
吴贤豪
张贺
冯向东
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Zhejiang Co Ltd Of Zhe Neng Institute For Research And Technology
Zhejiang Energy Group Research Institute Co Ltd
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Zhejiang Co Ltd Of Zhe Neng Institute For Research And Technology
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Priority to CN201910417757.3A priority Critical patent/CN110208452A/en
Publication of CN110208452A publication Critical patent/CN110208452A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N31/00Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/10Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using catalysis

Abstract

The present invention relates to the denitrating catalyst Performance Test Systems that can cooperate with allotment dust content and temperature, including smoke heat exchanging system, dust pelletizing system, flue gas/ammonia hybrid system, reactor assembly and each control valve;Flue gas enters smoke heat exchanging system by former gas inlet isolating valve and deduster bypasses, and wherein smoke heat exchanging system includes circulating cooling water tank and flue gas heat-exchange unit;The input terminal of the output end connection dust pelletizing system of flue gas heat-exchange unit, the dust pelletizing system includes electric precipitator and ash bucket, and electric precipitator bottom is equipped with ash bucket;Ash bucket connects ash-transmission system, and the ash-transmission system includes auger and air-introduced machine, and ash bucket connects auger and unloading valve, and unloading valve connects air-introduced machine and smoke backflow isolating valve.The beneficial effects of the present invention are: the present invention can cooperate with the dustiness and temperature of allotment flue gas, examine under wide smoke temperature range, wide dust content range of condition, the performance of denitrating catalyst and the influence to denitrating catalyst service life and physicochemical property.

Description

A kind of denitrating catalyst performance test system cooperateing with allotment dust content and temperature System and method
Technical field
The present invention relates to a kind of flue gas denitrification system, more particularly to a kind of it can cooperate with the de- of allotment dust content and temperature Denox catalyst Performance Test System and method.
Background technique
Coal fired power plant low NOx combusting technology and NOx cleaning draining technology are widely used.It is de- in numerous tail flue gas In nitre technology, SCR technology is used by most coal fired power plants.Pass through nitrogen oxides in effluent and reduction Under the action of denitrating catalyst redox reaction occurs for agent, and pollutant NOx is converted to N2And H2O.However denitrating catalyst There is service life limitation, works by the high load capacity of 2-3, the decline of denitrating catalyst performance, physicochemical property change, It need to be regenerated or be abandoned processing.Extensive use with national grid EHV transmission technology, " depth peak regulation " policy simultaneously Implement in full, some areas coal fired power plant rate of load condensate degradation, hours of operation are die-offed, unit be chronically at underload or Under frequent varying duty state, cause boiler smoke tolerance, smoke temperature, flue gas composition and dustiness unstable etc. easily to the denitrating catalyst longevity The problem of life and physicochemical property damage.Currently, rarely having both at home and abroad about dust content and smoke temperature to denitrating catalyst The correlative study that can be influenced with physicochemical property, less favorably evaluates denitrating catalyst with station boiler actual condition flue gas Pilot-plant.
Summary of the invention
The purpose of the present invention is overcoming deficiency in the prior art, a kind of structurally reasonable, easy to use, economic reality is provided With, can cooperate with allotment dust content and temperature denitrating catalyst Performance Test System and method.
Can cooperate with allotment dust content and temperature denitrating catalyst Performance Test System, including smoke heat exchanging system, Dust pelletizing system, ash-transmission system, flue gas/ammonia hybrid system, reactor assembly and each control valve;Flue gas pass through former flue gas into Mouth isolating valve enters smoke heat exchanging system and deduster bypass, and wherein smoke heat exchanging system includes that circulating cooling water tank and flue gas change Hot device;The input terminal of the output end connection dust pelletizing system of flue gas heat-exchange unit, the dust pelletizing system include electric precipitator and ash bucket, electricity Deduster bottom is equipped with ash bucket;Ash bucket connects ash-transmission system, and the ash-transmission system includes auger and air-introduced machine, and ash bucket connects auger And unloading valve, unloading valve connect air-introduced machine and smoke backflow isolating valve;The output end of electric precipitator connects flue gas/ammonia mixed stocker The input terminal of system, the flue gas/ammonia hybrid system include ammonia/dilution wind mixer and flue gas/ammonia mixer;Flue gas/ammonia The output end of gas mixer connects reactor assembly, and the reactor assembly includes Benitration reactor and is placed in Benitration reactor Denitrating catalyst, Benitration reactor is mainly made of in parallel Benitration reactor A and Benitration reactor B;Reactor assembly Output end connects air-introduced machine.
As preferred: being equipped with recirculated cooling water outlet valve and recirculated cooling water between circulating cooling water tank and flue gas heat-exchange unit Inlet valve.
As preferred: the input terminal of flue gas heat-exchange unit is equipped with heat exchanger inlet valve.
As preferred: deduster bypass is equipped with deduster bypass valve.
As preferred: the output end of electric precipitator is equipped with house outlet valve.
As preferred: ammonia/dilution wind mixer is equipped with ammonia isolating valve and dilution wind isolating valve.
As preferred: the input terminal of Benitration reactor A and Benitration reactor B are respectively equipped with reactor A inlet valve and reaction Device B inlet valve.
The test method of the denitrating catalyst Performance Test System of allotment dust content and temperature can be cooperateed with, including following Step:
1) former gas inlet isolating valve, deduster bypass valve, reactor A inlet valve or reactor B inlet valve, flue gas are opened Flow back isolating valve and air-introduced machine, draws one operating condition after falling grey section from boiler economizer outlet, before Benitration reactor admission section Flue gas enters system;
2) by adjusting the aperture of deduster bypass valve and heat exchanger inlet valve, to distribute into deduster bypass and cigarette The flue gas flow of gas heat exchanger;A portion flue gas enters electric precipitator after flue gas heat-exchange unit exchanges heat and is dusted place Reason, and flue gas heat-exchange unit outlet smoke temperature is controlled within the scope of electric precipitator best effort smoke temperature, the particulate matter being removed is fallen into In the ash bucket of electric precipitator bottom, when ash bucket endoparticle object, which collects height, reaches high limit, auger and unloading valve are automatically turned on Discharging, the backflow flue gas band back boiler that particulate matter is exported by air-introduced machine;Another part flue gas is then directly bypassed through deduster;Pass through The pro rate of two-way flue gas, collaboration allotment dust content and temperature;
3) flue gas after heat exchange and dust removal process enters flue gas/ammonia after directly mixing through the flue gas of deduster bypass Mixer, after prepared ammonia reducing agent mixes in ammonia/dilution wind mixer by a certain percentage, into denitration reaction Device A and Benitration reactor B are reacted, and denitrating catalyst performance is examined;
4) flue gas after denitration process is back to boiler air preheater through air-introduced machine and is exported to deduster admission section.
As preferred: flue gas heat-exchange unit exports fibre selection at 135~145 DEG C.
The beneficial effects of the present invention are:
1, the present invention is a set of direct system that denitrating catalyst performance is examined using boiler actual condition flue gas.
2, the present invention can cooperate with the dustiness and temperature of allotment flue gas, examine wide smoke temperature range, wide dust content range item Under part, the performance of denitrating catalyst and the influence to denitrating catalyst service life and physicochemical property.
3, it by the design of air-introduced machine, not only avoids pilot test system introducing flue gas flow and is unsatisfactory for asking for test requirements document Topic, while solving the electric precipitator bottom particles object hidden danger that deposition and flue gas pipeline block for a long time, improve device security And availability.
Detailed description of the invention
Fig. 1 is the denitrating catalyst Performance Test System schematic diagram that can cooperate with allotment dust content and temperature.
Description of symbols: former gas inlet isolating valve 1, deduster bypass valve 2, heat exchanger inlet valve 3, house outlet Valve 4, circulating cooling water tank 5, flue gas heat-exchange unit 6, electric precipitator 7, ash bucket 8, auger 9, unloading valve 10, flue gas/ammonia mixer 11, ammonia/dilution wind mixer 12, ammonia isolating valve 13, dilution wind isolating valve 14, reactor A inlet valve 15, reactor B import Valve 16, Benitration reactor A17, Benitration reactor B18, air-introduced machine 19, smoke backflow isolating valve 20, recirculated cooling water outlet valve 21, recirculated cooling water inlet valve 22.
Specific embodiment
The present invention is described further below with reference to embodiment.The explanation of following embodiments is merely used to help understand this Invention.It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, also Can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the protection scope of the claims in the present invention It is interior.
As shown in Figure 1, the denitrating catalyst Performance Test System for cooperateing with allotment dust content and temperature, packet Include five systems such as smoke heat exchanging system, dust pelletizing system, ash-transmission system, flue gas/ammonia hybrid system, reactor assembly and each Control valve.The smoke heat exchanging system includes circulating cooling water tank 5 and flue gas heat-exchange unit 6, and the dust pelletizing system is removed including electricity Dirt device 7 and ash bucket 8;The ash-transmission system includes auger 9 and air-introduced machine 19;The flue gas/ammonia hybrid system includes ammonia/dilution Wind mixer 12 and flue gas/ammonia mixer 11;The reactor assembly includes two Benitration reactors in parallel and is placed in de- Denitrating catalyst in nitre reactor.Flue gas flow direction indicates that recirculated cooling water flow direction is referred to hollow arrow with solid arrow Show.
Flue gas passes through former gas inlet isolating valve 1 and enters smoke heat exchanging system and deduster bypass;Smoke heat exchanging system packet Circulating cooling water tank 5 and flue gas heat-exchange unit 6 are included, recirculated cooling water is equipped between circulating cooling water tank 5 and flue gas heat-exchange unit 6 and is discharged The input terminal of valve 21, recirculated cooling water inlet valve 22, flue gas heat-exchange unit 6 is equipped with heat exchanger inlet valve 3;Deduster bypass is equipped with Deduster bypass valve 2;The input terminal of the output end connection electric precipitator 7 of flue gas heat-exchange unit 6,7 bottom of electric precipitator is equipped with ash bucket 8, ash bucket 8 connects auger 9 and unloading valve 10, and unloading valve 10 connects air-introduced machine 19 and smoke backflow isolating valve 20;Electric precipitator 7 Output end connects flue gas/ammonia hybrid system by house outlet valve 4, and flue gas/ammonia hybrid system includes that ammonia/dilution wind is mixed Clutch 12 and flue gas/ammonia mixer 11, ammonia/dilution wind mixer 12 are equipped with ammonia isolating valve 13 and dilution wind isolating valve 14; Flue gas/ammonia mixer 11 output end connects reactor assembly, reactor assembly mainly by parallel Benitration reactor A17 and The input terminal of Benitration reactor B18 composition, Benitration reactor A17 and Benitration reactor B18 are respectively equipped with reactor A inlet valve 15 With reactor B inlet valve 16;Reactor assembly output end connects air-introduced machine 19.
The test method of the denitrating catalyst Performance Test System for cooperateing with allotment dust content and temperature is such as Under:
1) former gas inlet isolating valve 1, deduster bypass valve 2, reactor A inlet valve 15 or reactor B inlet valve are opened 16 (can also open simultaneously), smoke backflow isolating valve 20 and air-introduced machine 19 export after falling grey section, denitration reaction from boiler economizer The operating condition flue gas that one smoke temperature is drawn before device admission section at 380 DEG C or so enters this system.
2) by adjust deduster bypass valve 2 and heat exchanger inlet valve 3 aperture, thus distribute into deduster bypass and The flue gas flow of flue gas heat-exchange unit 6 has the function that Collaborative Control dust content and temperature.A portion flue gas passes through cigarette Gas heat exchanger 6 enters electric precipitator 7 after exchanging heat and is dusted processing, and controls flue gas heat-exchange unit 6 and export smoke temperature in electric precipitator 7 Within the scope of best effort smoke temperature, the particulate matter being removed is fallen into the ash bucket 8 of 7 bottom of electric precipitator, when 8 endoparticle object of ash bucket When collection height reaches high limit, auger 9 and unloading valve 10 automatically turn on discharging, the reflux cigarette that particulate matter is exported by air-introduced machine 19 Gas band back boiler.Another part flue gas is then directly bypassed through deduster.Pass through the pro rate of two-way flue gas, collaboration allotment flue gas Dustiness and temperature.
3) flue gas after heat exchange and dust removal process enters flue gas/ammonia after directly mixing through the flue gas of deduster bypass Mixer 11 can be by test after prepared ammonia reducing agent mixes in ammonia/dilution wind mixer 12 by a certain percentage It is reacted it is required that entering Benitration reactor A17 and Benitration reactor B18, examines denitrating catalyst performance.
4) flue gas after denitration process is back to boiler air preheater through air-introduced machine 19 and is exported to deduster admission section.
Each component and pipeline are all made of high temperature resistant, anti-abrasive material in system.
Flue gas heat-exchange unit 6 exports smoke temperature and preferably controls at 140 ± 5 DEG C, so that electric precipitator 7 is made to reach best effort operating condition, When electric precipitator 7 is when flue-gas temperature is 140 DEG C, denitration efficiency is up to 98% or more.
By controlling opening of valve and air-introduced machine power, flue gas flow rate in Benitration reactor is controlled, flue gas in reactor is made Flow velocity and reactor size reduce in proportion with boiler actual condition, guarantee gas residence time.
Smoke backflow main pipe can suitably reduce caliber after air-introduced machine, thus accelerate the flue gas flow rate in smoke backflow main pipe, To reach preferably defeated grey effect.
The concentration of ammonia is identical as industrial application holding in ammonia/dilution wind mixed gas, can also be by changing the dense of reducing agent Degree seeks its influence to denitration effect.
The denitrating catalyst performance test methods of allotment dust content and temperature can be cooperateed with as follows:
By to the exhaust gas volumn for passing through flue gas heat-exchange unit 6 and electric precipitator 7 and the exhaust gas volumn for being directly over deduster bypass Distribution, while adjusting the efficiency of dust collection of electric precipitator 7, the dustiness and temperature of allotment flue gas can be cooperateed with.By the operating condition of preparation Flue gas and ammonia carry out redox reaction after mixing, into Benitration reactor, pass through reactor outlet CEMS system pair The denitration performance that denitrating catalyst is directed under current working smoke behavior is tested.
If the practical flue gas smoke temperature drawn is 400 DEG C, flue-gas temperature is 140 DEG C after flue gas heat-exchange unit, former dust contained flue gas Amount is 20000mg/m3, the controllable efficiency range of electric precipitator is 0-100%, then can cooperate with the dust content and temperature ginseng of allotment Number see the table below:
Table 1 can cooperate with the dust content and temperature parameter of allotment

Claims (9)

1. the denitrating catalyst Performance Test System that one kind can cooperate with allotment dust content and temperature, which is characterized in that including Smoke heat exchanging system, dust pelletizing system, ash-transmission system, flue gas/ammonia hybrid system, reactor assembly and each control valve;Cigarette Gas passes through former gas inlet isolating valve (1) and enters smoke heat exchanging system and deduster bypass, and wherein smoke heat exchanging system includes following Ring cooling water tank (5) and flue gas heat-exchange unit (6);The input terminal of the output end connection dust pelletizing system of flue gas heat-exchange unit (6), it is described to remove Dirt system includes electric precipitator (7) and ash bucket (8), and electric precipitator (7) bottom is equipped with ash bucket (8);The defeated ash system of ash bucket (8) connection System, the ash-transmission system include auger (9) and air-introduced machine (19), and ash bucket (8) connects auger (9) and unloading valve (10), unloading valve (10) air-introduced machine (19) and smoke backflow isolating valve (20) are connected;The output end of electric precipitator (7) connects flue gas/ammonia mixed stocker The input terminal of system, the flue gas/ammonia hybrid system include ammonia/dilution wind mixer (12) and flue gas/ammonia mixer (11); Flue gas/ammonia mixer (11) output end connects reactor assembly, and the reactor assembly includes Benitration reactor and is placed in Denitrating catalyst in Benitration reactor, Benitration reactor is mainly by Benitration reactor A (17) and Benitration reactor B in parallel (18) it forms;The output end of reactor assembly connects air-introduced machine (19).
2. the denitrating catalyst Performance Test System according to claim 1 for cooperateing with allotment dust content and temperature, It is characterized in that, being equipped with recirculated cooling water outlet valve (21) between circulating cooling water tank (5) and flue gas heat-exchange unit (6) and recycling cold But water inlet valve (22).
3. the denitrating catalyst Performance Test System according to claim 1 for cooperateing with allotment dust content and temperature, It is characterized in that, the input terminal of flue gas heat-exchange unit (6) is equipped with heat exchanger inlet valve (3).
4. the denitrating catalyst Performance Test System according to claim 1 for cooperateing with allotment dust content and temperature, It is characterized in that, deduster bypass is equipped with deduster bypass valve (2).
5. the denitrating catalyst Performance Test System according to claim 1 for cooperateing with allotment dust content and temperature, It is characterized in that, the output end of electric precipitator (7) is equipped with house outlet valve (4).
6. the denitrating catalyst Performance Test System according to claim 1 for cooperateing with allotment dust content and temperature, It is characterized in that, ammonia/dilution wind mixer (12) is equipped with ammonia isolating valve (13) and dilution wind isolating valve (14).
7. the denitrating catalyst Performance Test System according to claim 1 for cooperateing with allotment dust content and temperature, It is characterized in that, the input terminal of Benitration reactor A (17) and Benitration reactor B (18) are respectively equipped with reactor A inlet valve (15) With reactor B inlet valve (16).
8. the denitrating catalyst Performance Test System that one kind can cooperate with allotment dust content and temperature as described in claim 1 Test method, which comprises the following steps:
1) former gas inlet isolating valve (1), deduster bypass valve (2), reactor A inlet valve (15) or reactor B import are opened Valve (16), smoke backflow isolating valve (20) and air-introduced machine (19) export after falling grey section, Benitration reactor import from boiler economizer One operating condition flue gas is drawn before section enters system;
2) by adjust deduster bypass valve (2) and heat exchanger inlet valve (3) aperture, thus distribute into deduster bypass with The flue gas flow of flue gas heat-exchange unit (6);A portion flue gas enters electric precipitator (7) after flue gas heat-exchange unit (6) exchange heat It is dusted processing, and controls flue gas heat-exchange unit (6) outlet smoke temperature within the scope of electric precipitator (7) best effort smoke temperature, quilt The particulate matter of removing is fallen into the ash bucket (8) of electric precipitator (7) bottom, is collected height when ash bucket (8) endoparticle object and is reached high limit When position, auger (9) and unloading valve (10) automatically turn on discharging, the backflow flue gas band twice-cooked stir-frying that particulate matter is exported by air-introduced machine (19) Furnace;Another part flue gas is then directly bypassed through deduster;By the pro rate of two-way flue gas, collaboration allotment dust content and Temperature;
3) flue gas after heat exchange and dust removal process enters flue gas/ammonia after directly mixing through the flue gas of deduster bypass and mixes Device (11), after prepared ammonia reducing agent mixes in ammonia/dilution wind mixer (12) by a certain percentage, into denitration Reactor A (17) and Benitration reactor B (18) are reacted, and denitrating catalyst performance is examined;
4) flue gas after denitration process is back to boiler air preheater through air-introduced machine (19) and is exported to deduster admission section.
9. the denitrating catalyst Performance Test System according to claim 8 for cooperateing with allotment dust content and temperature Test method, which is characterized in that flue gas heat-exchange unit (6) exports fibre selection at 135~145 DEG C.
CN201910417757.3A 2019-05-20 2019-05-20 A kind of denitrating catalyst Performance Test System and method cooperateing with allotment dust content and temperature Pending CN110208452A (en)

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Cited By (2)

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CN115469050A (en) * 2022-07-22 2022-12-13 国能龙源催化剂江苏有限公司 Test system and method for evaluating reaction performance of SCR (Selective catalytic reduction) catalyst

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