CN104548932A - Fume temperature coordination type wide load denitrification system - Google Patents

Fume temperature coordination type wide load denitrification system Download PDF

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Publication number
CN104548932A
CN104548932A CN201510009041.1A CN201510009041A CN104548932A CN 104548932 A CN104548932 A CN 104548932A CN 201510009041 A CN201510009041 A CN 201510009041A CN 104548932 A CN104548932 A CN 104548932A
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China
Prior art keywords
economizer
cigarette
temperature
fume
well
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Pending
Application number
CN201510009041.1A
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Chinese (zh)
Inventor
朱宰基
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Shanghai Wujing Power Generation Co Ltd
Wujing Thermal Power Plant Shanghai Electric Power Co Ltd
Original Assignee
Shanghai Wujing Power Generation Co Ltd
Wujing Thermal Power Plant Shanghai Electric Power Co Ltd
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Application filed by Shanghai Wujing Power Generation Co Ltd, Wujing Thermal Power Plant Shanghai Electric Power Co Ltd filed Critical Shanghai Wujing Power Generation Co Ltd
Priority to CN201510009041.1A priority Critical patent/CN104548932A/en
Publication of CN104548932A publication Critical patent/CN104548932A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a fume temperature coordination type wide load denitrification system which comprises an economizer arranged in a front section of a tail fume well and a separator arranged in the middle of the economizer, wherein a flue gas denitrification device is arranged in the rear section of the tail fume well; a fume temperature measuring point is formed at the fume outlet of the economizer; and the system is characterized in that an adjustable baffle controlled to open and close by virtue of a control system is arranged in the rear of the fume outlet of the economizer in the tail fume well. According to the technical problem, the fume temperature at the inlet of an SCR denitrification device is adjusted, so that the SCR denitrification device operates in an uninterrupted mode, the SCR denitrification efficiency of the boiler is properly improved, and the safe and economic operation of the boiler is guaranteed.

Description

Cigarette temperature coordinates molded breadth load denitrating system
Technical field
The present invention relates to a kind of cigarette temperature and coordinate molded breadth load denitrating system, belong to the boiler smoke system regions of power station generator group.
Background technology
Power industry has and sulfur dioxide (chemical molecular formula SO 2), the smoke dust discharge concentration three major source of pollution of running neck and neck--nitrogen oxide (is called for short NO x), be all classified as the obstruction point of urban construction " finer " by National Development and Reform Committee, by the vast city people dirt view, its one of primary pollution source of discharging for fire coal boiler fume.
For this reason, State Environmental Protection Administration has issued " thermal power plant's air pollution emission standard " for this, implemented all newly-built fired power generating unit NOx emission concentration and all will reach 100mg/Nm from 1 day January in 2012 3following requirement, and regulation was from 1 day January in 2014, all thermoelectricitys in key area put into operation the NO of unit xconcentration of emission also will reach 100mg/Nm 3below.Therefore, in current thermal power plant's pollution reduction work, denitrating flue gas is undoubtedly the most important thing.
The gas denitrifying technology extensively adopted at present is SNCR, refer to being collectively referred to as of boiler furnace staged air distribution (referred to as SOFA) and SCR (referred to as SCR), double track develops simultaneously, and purport is for strengthening denitration effect and can reducing ammonia use amount.And SCR refers at boiler back end ductwork appropriate area arrangement Benitration reactor, use reducing agent (ammonia) and catalyst (main composition titanium dioxide) by NO in flue gas xreduction, its NO xremoval efficiency generally can reach more than 90%, thus can reach control NO completely xdischarge meets the object of " standard ".
In SCR device system, reactor catalyst is a visual plant that can not lack, and it has a deadly defect, namely its working reaction temperature is only 320 ~ 420 DEG C of regions, depart from this regional work, ammonia will cause catalyst poisoning and even inefficacy, cause denitration efficiency seriously to reduce the most at last or do not play denitration effect completely, pollution reduction work is not known where to begin.
What for this, all power stations all arranged that flue gas surmounts this temperature province for this reason goes out control system automatically, namely surmount this temperature province and automatically do not throw ammonia, but the inactive of SCR device system brings NO simultaneously xthe significantly rising of concentration of emission, now concentration generally will at more than 300mg/Nm3.
Rear of Utility Boiler flue enter SCR device flue-gas temperature boiler at full capacity or higher load (referring to more than 70%) operating mode time, all can run on 320 ~ 420 DEG C of regions.Now become low by electric power market demand or coal is more bad or change greatly time, or during the multifactor impact such as unit equipment defect, when boiler load operating mode reduces further, tail flue gas temperature is touched 320 DEG C " red lines " at any time, this phenomenon is probably frequently occurring now and even in one period from now on, and power station enterprise affects rather worry, puzzlement by it.Pollution reduction work becomes very thorny immediately.
Catalyst poisoning and even inefficacy, the catalyst that certainly will need more renew, and catalyst cost price is high, changes and needs again the inactive unit long period, brings high economic loss to electricity power enterprise.
Summary of the invention
The technical problem to be solved in the present invention is: provide that a kind of temperature adjustment coordination performance is good, cost is low, realize the cigarette temperature of high-efficiency and low-pollution and coordinate molded breadth load denitrating system, solve in SCR device system, ammonia will cause the problem of catalyst poisoning and even inefficacy.
In order to solve the problems of the technologies described above, technical scheme of the present invention there is provided a kind of cigarette temperature and coordinates molded breadth load denitrating system, the dividing plate in the middle of economizer and economizer is provided with in the leading portion comprising afterbody cigarette well, equipment for denitrifying flue gas is provided with in the back segment of afterbody cigarette well, economizer smoke outlet is furnished with cigarette temperature measuring point, it is characterized in that, in described afterbody cigarette well, economizer smoke outlet is provided with the controllable register being controlled folding by control system below.
Preferably, the stiff end of described controllable register is located on the sidewall of afterbody cigarette well.
Preferably, the movable end of described controllable register is connected with dividing plate or is positioned at the below of dividing plate.
Preferably, described control system comprises console, and console sends the aperture of instruction control and regulation baffle plate, by regulating the aperture of controllable register to regulate cigarette temperature, the cigarette temperature obtained is delivered to console by data transmission.
The present invention can realize the target of the on-line automatic adjustment of SCR denitration device porch cigarette temperature, ensure that no matter SCR denitration device can put into operation at high load capacity or underload, control exhaust gas temperature to be unlikely to improve too much simultaneously, the higher boiler efficiency of basic guarantee, achieves high-efficiency and low-pollution target.This technical scheme temperature adjustment coordination performance is good, load width is enough, achieve noticeable achievement, and structure is simple and easy to realize, improvement cost relative moderate.Walked out quick road, round Realization cigarette temperature coordinates the Application and Development of molded breadth load denitrating system, conscientiously uninterruptedly makes a great contribution for pollution reduction work!
The present invention, by the adjustment to SCR denitration device entrance flue gas temperature, makes SCR denitration device uninterrupted operation work, and suitably improves the technical problem of boiler SCR denitration efficiency, holds concurrently and ensures the safety and economic operation of boiler.The present invention thoroughly will solve above-mentioned 320 DEG C of " red line " problems, and for the users of electricity power enterprise and use SCR denitration device system break away from this puzzlement, what play SCR denitration device " round-the-clock " better serves effect!
Accompanying drawing explanation
Fig. 1 is the schematic diagram that a kind of cigarette temperature coordinates molded breadth load denitrating system;
Fig. 2 is the schematic flow sheet of flue gas system;
Fig. 3 is the flow chart of fibre selection system.
Wherein: 1-economizer, 2-dividing plate, 3-controllable register, 4-equipment for denitrifying flue gas, 5-afterbody cigarette well.
Detailed description of the invention
For making the present invention become apparent, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
The present invention is that a kind of cigarette temperature coordinates molded breadth load denitrating system, be mainly used in the cigarette temperature before boiler tail flue gas denitrification apparatus 4 and promote adjustment, as shown in Figure 1, it comprise afterbody cigarette well 5, equipment for denitrifying flue gas 4 in the back segment of dividing plate 2 in the middle of the economizer 1 arranged in the leading portion of afterbody cigarette well 5 and economizer 1 and afterbody cigarette well 5.In afterbody cigarette well 5, economizer 1 smoke outlet is provided with the controllable register 3 being controlled folding by control system below.The stiff end of controllable register 3 is fixed on the sidewall of afterbody cigarette well 5.The movable end of controllable register 3 is connected with dividing plate 2 or is positioned at the below of dividing plate 2.Controllable register 3 welds with afterbody cigarette well 5 side wall and central dividing plate 2 and links.
As shown in Figure 3, control system comprises console, and console sends the aperture of instruction control and regulation baffle plate 3, by regulating the aperture of controllable register 3 to regulate cigarette temperature, the cigarette temperature obtained is delivered to console by data transmission.
As shown in Figures 2 and 3, fuel and air burn in boiler furnace generate flue gas flow through afterbody cigarette well 5 after, the temperature of cigarette temperature measuring point to this flue gas of being arranged at economizer 1 smoke outlet by control system is monitored and is analyzed, when this place's flue-gas temperature surmounts DEG C region, SCR320 ~ 420, control system controls to send instruction, controllable register 3 progressively turns down to setting aperture, control small part exhaust gas volumn to flow on the heating surface of both walls economizer 1, and economizer 1 heating surface forcing most of exhaust gas volumn to flow through the zone line of dividing plate 2 flows, control economizer 1 smoke outlet, namely SCR device inlet flue gas temperature is within the scope of SCR320 ~ 420 DEG C.When this place's flue-gas temperature does not reach SCR optimal reaction temperature scope, controllable register 3 is closed to setting aperture by continuing by control system, until cigarette temperature enters equipment for denitrifying flue gas 4 after more than SCR320.
When flue-gas temperature carries out denitration operation to DEG C areas case of SCR320 ~ 420, namely ensure that the use safety of catalyst in equipment for denitrifying flue gas 4, turn improve denitration efficiency, also ensure that the safety and economic operation of boiler simultaneously.
From theory calculate angle analysis, assuming that SCR inlet flue gas temperature is SCR optimal reaction temperature 320 ~ 420 DEG C, the thermodynamic computing under corresponding operating mode obtains the corresponding heating surface area of economizer 1, then draws the optimum position that flue gas dividing plate 2 is arranged.Control effectively by controllable register 3 afterwards again, in process, no matter how numerous and diverse actual condition is, only need the data according to SCR inlet flue gas temperature measuring point, carry out timely temperature feedback rapidly, the adjustment of controllable register 3 aperture is carried out, until SCR inlet flue gas temperature measuring point data is stabilized in SCR optimal reaction temperature 320 ~ 420 DEG C by control system.
The present invention ensures that SCR denitration device uninterrupted operation work provides the cigarette temperature controlling system of transformation, namely in the vertical afterbody cigarette well 5 of boiler tail, economizer 1 place sets up flue gas dividing plate 2, its former cigarette well is divided into triple channel, and before equipment for denitrifying flue gas 4, economizer 1 flue gas flow direction exit settles the controllable register 3 four pieces of fire resistant anticorrosive.Monitored by unit DCS control system according to this cigarette temperature characteristics during different load and analyze, the different opening of control and regulation baffle plate 3 folding, regulates this to flow through the cigarette temperature at place automatically, to make it satisfied and higher than 320 DEG C.
Controllable register 3 is positioned at afterbody cigarette well 5, and baffle plate executing agency is positioned at outside the flue of both sides.When afterbody SCR denitration device entrance flue gas temperature exceedes the optimal reaction temperature of catalytic reduction, control system control and regulation baffle plate 3 opens to setting aperture (when operating mode at full capacity, being generally out foot); When detecting this place's flue-gas temperature and have downward trend and close to before not reaching 320 DEG C, control system turning down fast for controllable register 3 (estimate general when close to 180MW, baffle plate aperture is about 60%); Along with the further reduction of load, controllable register 3 will synchronously turn down, the heat exchange amount of both sides economizer 1 pipe row is reduced while the exhaust gas volumn of both sides in vertical shaft being reduced, cigarette temperature is forced to be raised, to maintain and to meet cigarette temperature requirement (when estimating general 180MW ~ 120MW, controllable register 3 aperture is between 60% ~ 20%) higher than 320 DEG C; Controllable register 3 aperture limit aperture is arranged on 10% to deal with extremely bad working environments, and double considering keeps proper flow flux, in case the impact of controllable register 3 dust stratification.

Claims (4)

1. a cigarette temperature coordinates molded breadth load denitrating system, the dividing plate (2) in the middle of economizer (1) and economizer (1) is provided with in the leading portion comprising afterbody cigarette well (5), equipment for denitrifying flue gas (4) is provided with in the back segment of afterbody cigarette well (5), economizer (1) smoke outlet is furnished with cigarette temperature measuring point, it is characterized in that, being provided with below by the controllable register (3) of control system control folding of described afterbody cigarette well (5) interior economizer (1) smoke outlet.
2. a kind of cigarette temperature as claimed in claim 1 coordinates molded breadth load denitrating system, and it is characterized in that, the stiff end of described controllable register (3) is located on the sidewall of afterbody cigarette well (5).
3. a kind of cigarette temperature as claimed in claim 1 or 2 coordinates molded breadth load denitrating system, and it is characterized in that, the movable end of described controllable register (3) is connected with dividing plate (2) or is positioned at the below of dividing plate (2).
4. a kind of cigarette temperature as claimed in claim 1 coordinates molded breadth load denitrating system, it is characterized in that, described control system comprises console, console sends the aperture of instruction control and regulation baffle plate (3), by regulating the aperture of controllable register (3) to regulate cigarette temperature, the cigarette temperature obtained is delivered to console by data transmission.
CN201510009041.1A 2015-01-08 2015-01-08 Fume temperature coordination type wide load denitrification system Pending CN104548932A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104913293A (en) * 2015-05-18 2015-09-16 西安西热锅炉环保工程有限公司 Economizer device allowing smoke temperature of power station boiler to be adjusted
CN105546562A (en) * 2016-01-29 2016-05-04 上海久试电力技术有限公司 Flue and control method for controlling smoke temperature and improvement method for flue
CN105841136A (en) * 2016-05-20 2016-08-10 陈增宏 Coal economizer system for boiler SCR denitrification
CN105890390A (en) * 2015-12-22 2016-08-24 江苏卓易环保科技有限公司 Pollution-reducing and waste heat recycling boiler
CN106547286A (en) * 2016-12-26 2017-03-29 北京神雾环境能源科技集团股份有限公司 flue gas SCR denitration intelligent temperature control device
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
CN110038433A (en) * 2019-05-13 2019-07-23 哈尔滨工业大学 A kind of SCR inlet flue gas preprocessing system and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202432499U (en) * 2011-05-27 2012-09-12 华西能源工业股份有限公司 Heated surface adjusting device
CN103807863A (en) * 2014-01-24 2014-05-21 上海发电设备成套设计研究院 Improved smoke temperature adjusting system for selective catalytic reduction

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202432499U (en) * 2011-05-27 2012-09-12 华西能源工业股份有限公司 Heated surface adjusting device
CN103807863A (en) * 2014-01-24 2014-05-21 上海发电设备成套设计研究院 Improved smoke temperature adjusting system for selective catalytic reduction

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104913293A (en) * 2015-05-18 2015-09-16 西安西热锅炉环保工程有限公司 Economizer device allowing smoke temperature of power station boiler to be adjusted
CN105890390A (en) * 2015-12-22 2016-08-24 江苏卓易环保科技有限公司 Pollution-reducing and waste heat recycling boiler
CN105546562A (en) * 2016-01-29 2016-05-04 上海久试电力技术有限公司 Flue and control method for controlling smoke temperature and improvement method for flue
CN105841136A (en) * 2016-05-20 2016-08-10 陈增宏 Coal economizer system for boiler SCR denitrification
CN106547286A (en) * 2016-12-26 2017-03-29 北京神雾环境能源科技集团股份有限公司 flue gas SCR denitration intelligent temperature control device
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
CN110038433A (en) * 2019-05-13 2019-07-23 哈尔滨工业大学 A kind of SCR inlet flue gas preprocessing system and method

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Application publication date: 20150429