CN104214769A - Stone coal power generation selenium extraction comprehensive utilization system and method combining high-temperature dust removing and low-temperature dust removing - Google Patents

Stone coal power generation selenium extraction comprehensive utilization system and method combining high-temperature dust removing and low-temperature dust removing Download PDF

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Publication number
CN104214769A
CN104214769A CN201410437397.0A CN201410437397A CN104214769A CN 104214769 A CN104214769 A CN 104214769A CN 201410437397 A CN201410437397 A CN 201410437397A CN 104214769 A CN104214769 A CN 104214769A
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China
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temperature
selenium
temperature dust
low temperature
low
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CN201410437397.0A
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Chinese (zh)
Inventor
王鹏利
高洪培
刘海峰
张继瑞
林伟荣
张世鑫
王海涛
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中国华能集团清洁能源技术研究院有限公司
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Priority to CN201410437397.0A priority Critical patent/CN104214769A/en
Publication of CN104214769A publication Critical patent/CN104214769A/en

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Abstract

Disclosed is a stone coal power generation selenium extraction comprehensive utilization system and method combining high-temperature dust removing and low-temperature dust removing. The system comprises a fluidized bed boiler for burning stone coal fuel, a superheater and an economizer, wherein the superheater and the economizer are sequentially arranged in a tail flue of the fluidized bed boiler, and the system further comprises high-temperature dust removing equipment, low-temperature dust removing equipment, an air preheater, an induced draft fan and a chimney. The high-temperature dust removing equipment and the low-temperature dust removing equipment are sequentially arranged on different temperature area segments of an outlet of the tail flue of the fluidized bed boiler, the air preheater is arranged between the high-temperature dust removing equipment and the low-temperature dust removing equipment, the induced draft fan and the chimney are sequentially arranged behind the low-temperature dust removing equipment, the high-temperature dust removing equipment is arranged on the area, at the temperature more than 360 DEG C, of the outlet of the tail flue of the fluidized bed boiler, and the low-temperature dust removing equipment is arranged on the 130 DEG C normal smoke exhaust temperature area behind the high-temperature dust removing equipment (5). The invention further provides a stone coal power generation selenium extraction comprehensive utilization method of the system. The system and method have the advantages of being high in selenium extraction efficiency, simple in system, low in selenium escape rate, small in occupied field, low in equipment investment and the like.

Description

Selenium utilization system and method are put forward in the bone coal generating that high and low temperature dedusting combines

Technical field

The invention belongs to bone coal comprehensive utilization technique field, be specifically related to the bone coal generating that a kind of high and low temperature dedusting combines and put forward selenium utilization system and method.

Background technology

Bone coal is a kind of many metals symbiosis shale ore, be formed at the early Proterozoic Era and Eopaleozoic, there is high ash, high-sulfur, lower calorific value and the large feature of hardness, both can make inferior fuel, also can therefrom extract the mineral matters such as selenium, vanadium, uranium, molybdenum, nickel, copper, cobalt, be dispersed throughout China Hunan, Hubei Province, river, Guizhou Province, Zhejiang, osmanthus, Jiangxi, Anhui, Shan, Shanxi, Henan, sweet etc. more than 20 and economize.

Selenium is plant, animal, the mankind's essential trace element, but that excessive absorption also can cause is poisoning.In coal, selenium major part is distributed in pyrite, also contains selenium in clay mineral and organic component.It is industrial that selenium dioxide is mainly used in electrolytic manganese, and one ton of electrolytic manganese of every production approximately needs 1 kilogram of selenium dioxide (each technique is slightly different), and electrolytic manganese industry accounts for 80% of selenium dioxide consumption.Secondly for producing sodium selenite on feed industry, now in agro-industry also as the fertile raw material of the blade face selenium containing selenium crops.

Selenium moves in coal combustion process, the selenium volatilization in coal more than 75%, and the selenium of enrichment in flying dust 79% is distributed in the fine particle of <2 μ m.The discharge of coal fired power plant selenium accounts for artificial the more than 50% of selenium discharge capacity in the whole world.The selenosis that fire coal causes mainly uses high selenium bone coal and causes, and burning discharges SeO 2in air, exist with aerosol state.Using high selenium bone coal area, in air, selenium concentration can be up to 0.6mg/m 3, easily there is people, animal selenosis event.

Summary of the invention

The problem existing in order to solve above-mentioned prior art, the object of the present invention is to provide the bone coal generating that a kind of high and low temperature dedusting combines to put forward selenium utilization system and method, there is the advantages such as the selenium of putting forward efficiency is high, system simple, selenium escapement ratio is low, occupied ground is little, equipment investment is low.

For reaching above object, the present invention adopts following technical scheme:

Selenium utilization system is carried in the bone coal generating that high and low temperature dedusting combines, comprise the fluidized-bed combustion boiler 10 for the bone coal fuel that burns, be arranged in successively superheater 8 and economizer 9 in fluidized-bed combustion boiler 10 back-end ductworks, also comprise the high-temperature dust removal equipment 5 and the low temperature cleaner 3 that are arranged in successively fluidized-bed combustion boiler 10 back-end ductwork outlet different temperatures area segments, be arranged in the air preheater 4 between high-temperature dust removal equipment 5 and low temperature cleaner 3, be arranged in successively low temperature cleaner 3 air-introduced machine 2 and chimney 1 afterwards.

Described high-temperature dust removal equipment 5 is arranged in the more than 360 DEG C region of fluidized-bed combustion boiler 10 back-end ductwork outlet temperatures, and described low temperature cleaner 3 is arranged in high-temperature dust removal equipment 5 130 DEG C of normal exhaust gas temperature regions afterwards.

Also comprise the ash bucket heating system 6 that is arranged in high-temperature dust removal equipment 5 and low temperature cleaner 3 bottoms.

Described ash bucket heating system 6 is circulating or free-standing, described circulating be that ash bucket heating system 6 absorbs hot precipitator ash bucket heat, be used for heating cold precipitator ash bucket, described stand alone type is that high-temperature dust removal equipment 5 and low temperature cleaner 3 are respectively arranged with ash bucket heating system 6.

Described superheater 8 is one or more levels.

Described economizer 9 is one or more levels.

Adopt system described above to carry out bone coal generating and put forward the method that selenium fully utilizes, bone coal burns and produces steam for generating in fluidized-bed combustion boiler 10, ash-laden gas is through after superheater 8 and economizer 9, enter hot precipitator 5 and remove a large amount of flying dusts that do not contain selenium or contain a small amount of selenium, enter afterwards air preheater 4 heat exchange coolings, temperature is down to behind 130 DEG C of normal exhaust gas temperature regions (lower than 315 DEG C of selenium dioxide sublimation temperatures), low-temperature flue gas enters cold precipitator 3 and carries out final dusting, collect enrichment the flying dust of selenium dioxide, finally by air-introduced machine 2, clean flue gas is sent into chimney 1.

Compared to the prior art, tool has the following advantages in the present invention:

1, the present invention adopts the high and low temperature cleaner mode that combines, hot precipitator is arranged in the more than 360 DEG C region of stove rear pass outlet, efficiency of dust collection design is not less than 90%, for removing the flyash that does not contain or only contain a small amount of selenium dioxide, cold precipitator is arranged in hot precipitator 130 DEG C of normal exhaust gas temperature regions (lower than 315 DEG C of selenium dioxide sublimation temperatures) afterwards, for collecting the flyash that is rich in selenium dioxide, thereby there is the higher selenium efficiency of putting forward.

2, the present invention only arranges that the heating surface in normal flow fluidized bed boiler back-end ductwork slightly adjust, after air preheater is moved to high-temperature electric dedusting, and flue arrangement convenience, system is simple.

3, the present invention utilizes selenium dioxide to understand the characteristic of attached collection on thin soot particle after lower than 315 DEG C, so selenium escapement ratio of the present invention is lower.

4, the present invention is without arranging independently piece-rate system, and occupied ground is little, and equipment investment is lower.

In sum, the present invention has the advantages such as the selenium of putting forward efficiency is high, system simple, selenium escapement ratio is low, occupied ground is little, equipment investment is low.

Brief description of the drawings

Fig. 1 is system schematic of the present invention.

Fig. 2 is ash bucket heating system (circulating) schematic diagram.

In figure: 1, chimney 2, air-introduced machine 3, cold precipitator 4, air preheater 5, hot precipitator 6, ash bucket heating system 7, main vapour header 8, superheater 9, economizer 10, fluidized-bed combustion boiler.

Detailed description of the invention

Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.

As shown in Figure 1, the present invention is high, selenium utilization system is carried in the bone coal generating that low temperature dedusting combines, comprise the fluidized-bed combustion boiler 10 for the bone coal fuel that burns, be arranged in successively superheater 8 and economizer 9 in fluidized-bed combustion boiler 10 back-end ductworks, also comprise the high-temperature dust removal equipment 5 and the low temperature cleaner 3 that are arranged in successively fluidized-bed combustion boiler 10 back-end ductwork outlet different temperatures area segments, be arranged in the air preheater 4 between high-temperature dust removal equipment 5 and low temperature cleaner 3, be arranged in successively low temperature cleaner 3 air-introduced machine 2 and chimney 1 afterwards, air preheater 4 is for reducing flue-gas temperature and heat recovery.

As the preferred embodiment of the present invention, described high-temperature dust removal equipment 5 is arranged in the more than 360 DEG C region of fluidized-bed combustion boiler 10 back-end ductwork outlet temperatures, and efficiency of dust collection design is not less than 90%, and this part flyash will not contain or only contain a small amount of selenium dioxide.Described low temperature cleaner 3 is arranged in high-temperature dust removal equipment 5 130 DEG C of normal exhaust gas temperature regions (lower than 315 DEG C of selenium dioxide sublimation temperatures) afterwards, and this part flyash will be rich in selenium dioxide, for reclaiming selenium.

As the preferred embodiment of the present invention, also comprise the ash bucket heating system 6 that is arranged in high-temperature dust removal equipment 5 and low temperature cleaner 3 bottoms.

Further, described ash bucket heating system 6 is circulating or free-standing, and described stand alone type is that high-temperature dust removal equipment 5 and low temperature cleaner 3 are respectively arranged with ash bucket heating system 6.As shown in Figure 2, be circulating ash bucket heating system, ash bucket heating system 6 absorbs hot precipitator ash bucket heat, is used for heating cold precipitator ash bucket, and appropriate design control ash bucket temperature is to prevent hawk knot.

As the preferred embodiment of the present invention, described superheater 8 is one or more levels, and superheater 8 is exported steam for generating, connects main vapour header 7.

As the preferred embodiment of the present invention, described economizer 9 is one or more levels.

The present invention also provides height, the method that the generating of bone coal that low temperature dedusting combines is carried selenium utilization system and carried out bone coal generating and propose selenium comprehensive utilization, as shown in Figure 1, bone coal burns and produces steam for generating in fluidized-bed combustion boiler 10, ash-laden gas is through after superheater 8 and economizer 9, enter hot precipitator 5 and remove a large amount of flying dusts that do not contain selenium or contain a small amount of selenium, enter afterwards air preheater 4 heat exchange coolings, temperature is down to behind 130 DEG C of normal exhaust gas temperature regions (lower than 315 DEG C of selenium dioxide sublimation temperatures), low-temperature flue gas enters cold precipitator 3 and carries out final dusting, collect enrichment the flying dust of selenium dioxide, finally by air-introduced machine 2, clean flue gas is sent into chimney 1.

Claims (7)

1. height, selenium utilization system is carried in the bone coal generating that low temperature dedusting combines, comprise the fluidized-bed combustion boiler (10) for the bone coal fuel that burns, be arranged in successively superheater (8) and economizer (9) in fluidized-bed combustion boiler (10) back-end ductwork, it is characterized in that: also comprise the high-temperature dust removal equipment (5) and the low temperature cleaner (3) that are arranged in successively fluidized-bed combustion boiler (10) back-end ductwork outlet different temperatures area segments, be arranged in the air preheater (4) between high-temperature dust removal equipment (5) and low temperature cleaner (3), be arranged in successively low temperature cleaner (3) air-introduced machine (2) and chimney (1) afterwards.
2. selenium utilization system is carried in the bone coal generating that high and low temperature dedusting according to claim 1 combines, it is characterized in that: described high-temperature dust removal equipment (5) is arranged in the more than 360 DEG C region of fluidized-bed combustion boiler (10) back-end ductwork outlet temperature, described low temperature cleaner (3) is arranged in high-temperature dust removal equipment (5) 130 DEG C of normal exhaust gas temperature regions afterwards.
3. selenium utilization system is carried in the bone coal generating that high and low temperature dedusting according to claim 1 combines, and it is characterized in that: also comprise the ash bucket heating system (6) that is arranged in high-temperature dust removal equipment (5) and low temperature cleaner (3) bottom.
4. selenium utilization system is carried in the bone coal generating that high and low temperature dedusting according to claim 3 combines, it is characterized in that: described ash bucket heating system (6) is for circulating or free-standing, described circulating be that ash bucket heating system (6) absorbs hot precipitator ash bucket heat, be used for heating cold precipitator ash bucket, described stand alone type is that high-temperature dust removal equipment (5) and low temperature cleaner (3) are respectively arranged with ash bucket heating system (6).
5. selenium utilization system is carried in the bone coal generating that high and low temperature dedusting according to claim 1 combines, and it is characterized in that: described superheater (8) is one or more levels.
6. selenium utilization system is carried in the bone coal generating that high and low temperature dedusting according to claim 1 combines, and it is characterized in that: described economizer (9) is one or more levels.
7. adopt system described in claim 1 to carry out bone coal generating to put forward the method for selenium comprehensive utilization, it is characterized in that: bone coal burns and produces steam for generating in fluidized-bed combustion boiler (10), ash-laden gas process superheater (8) and economizer (9) are afterwards, enter hot precipitator (5) and remove a large amount of flying dusts that do not contain selenium or contain a small amount of selenium, enter afterwards air preheater (4) heat exchange cooling, temperature is down to behind 130 DEG C of normal exhaust gas temperature regions, low-temperature flue gas enters cold precipitator (3) and carries out final dusting, collect enrichment the flying dust of selenium dioxide, finally by air-introduced machine (2), clean flue gas is sent into chimney (1).
CN201410437397.0A 2014-08-29 2014-08-29 Stone coal power generation selenium extraction comprehensive utilization system and method combining high-temperature dust removing and low-temperature dust removing CN104214769A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104534491A (en) * 2015-01-04 2015-04-22 山东大学 Ultralow-dust rear smoke channel system of boiler

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005291591A (en) * 2004-03-31 2005-10-20 Kobelco Eco-Solutions Co Ltd Recovery method for sewage sludge burned ash
CN200991619Y (en) * 2006-12-19 2007-12-19 江苏科林集团有限公司 Step-by-step pipe spray pulse bag-type dust collector
CN202152177U (en) * 2011-05-18 2012-02-29 杭州迪卡能源技术有限公司 Plug-in steam pipe ash discharge hopper heater
CN102297423A (en) * 2011-08-11 2011-12-28 江苏四方锅炉有限公司 Membrane type water-cooled wall four-flue biomass circulating fluidized bed boiler
CN102537980A (en) * 2012-01-16 2012-07-04 哈尔滨工业大学 High-temperature melting treatment system and method for sludge
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CN203222484U (en) * 2013-04-28 2013-10-02 中国华能集团清洁能源技术研究院有限公司 Circulating fluidized bed boiler structure for extracting selenium from stone coal
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104534491A (en) * 2015-01-04 2015-04-22 山东大学 Ultralow-dust rear smoke channel system of boiler

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Application publication date: 20141217