CN103084057B - Process for extracting coal ash to produce desulfurizer in pulverized coal combustion - Google Patents

Process for extracting coal ash to produce desulfurizer in pulverized coal combustion Download PDF

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Publication number
CN103084057B
CN103084057B CN201310030087.2A CN201310030087A CN103084057B CN 103084057 B CN103084057 B CN 103084057B CN 201310030087 A CN201310030087 A CN 201310030087A CN 103084057 B CN103084057 B CN 103084057B
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China
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ash
coal
flue gas
powder ash
powder
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CN201310030087.2A
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Chinese (zh)
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CN103084057A (en
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张榕杰
黄世峰
韩枝宏
黄成梠
赵雪
俞建洪
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福建永恒能源管理有限公司
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Abstract

The invention discloses a process for extracting coal ash to produce a desulfurizer in pulverized coal combustion. The process mainly comprises the following steps of: 1) feeding micro-pulverized coal from a pulverized tower to an efficient pulverized coal boiler to combust, wherein the micro-pulverized coal as combustion powder generates smoke with large particles and ash; 2) discharging the smoke with large particles and ash out of the boiler and quickly cooling, wherein the large particles are quickly cooled to glass beads; 3) performing cyclone dust removal for smoke with glass beads and ash cooled, wherein the glass beads are captured and separated from smoke; 4) feeding smoke with ash to a bag type deduster to separate smoke, wherein ash is fed to a pulping pool and smoke is fed to a desulfurizing tower to desulfurizer; and 5) performing reaction of ash added into the pulping pool and liquor in the pulping pool to form efficient calcium-based desulfurizer slurry, wherein the efficient calcium-based desulfurizer slurry is used for desulfurization of smoke. Compared with conventional process technology, the process not only reduces emission of coal ash, but also further provides an effective path for adequate utilization of coal ash.

Description

Flyash of purifying in a kind of coal dust firing produces desulfurizing agent technique

Technical field

The present invention relates to coal powder burning technology field, specifically refer in a kind of coal dust firing that flyash of purifying produces desulfurizing agent technique.

Background technology

Flyash is one of primary solids refuse of coal-burning power plant's discharge, and one of industrial residue that the current discharge capacity of Ye Shi China is larger, along with the development of power industry, the flyash discharge capacity of coal-burning power plant increases year by year, a large amount of flyash does not add process, will produce airborne dust, atmosphere pollution; River can be caused to silt up if enter water system, and toxic chemical substance wherein also can work the mischief to human body and biology.Current flyash is mainly used as concrete admixture and is utilized, and it utilizes speed to be still unable to catch up with the mass rate of emission of flyash far away, thus, for coal ash lifting is extremely urgent for a kind of more efficiently comprehensive Utilization Ways.The main oxides composition of power plants flyash has: SiO2, Al2O3, FeO, Fe2O3, CaO, TiO2 etc., wherein SiO2, Al2O3 occupy 50%-70%, CaO still occupies 7%-15%, this CaO still can make full use of by withdrawing deposit, the present inventor furthers investigate thus, from the CaO contained by existing flyash, by improving pulverized coal combustion, invented in a kind of coal dust firing flyash of purifying and produced desulfurizing agent technique, this case produces thus.

Summary of the invention

Flyash of purifying is the object of the present invention is to provide in a kind of coal dust firing to produce desulfurizing agent technique, for reducing the discharge of flyash and making full use of flyash and provide an effective way.

In order to reach above-mentioned purpose, solution of the present invention is:

Flyash of purifying in a kind of coal dust firing produces desulfurizing agent technique, mainly comprises the following steps:

1) microfine coal is sent into high-efficiency pulverized coal boiler combustion by coal dust tower, under control boiler inner sealing flame is in 1300 DEG C of-1500 DEG C of high temperature, clay mineral matter contained in microfine coal now as combustion powder melting form bulky grain at said high temperatures, final combustion powder produces the flue gas containing bulky grain and powder ash;

2) cool rapidly after the flue gas containing bulky grain and powder ash discharges out of the furnace, the bulky grain in flue gas is cooled to glass microballoon rapidly;

3) cyclone dust removal process is carried out to the flue gas containing glass microballoon and powder ash after cooling, thus the glass microballoon in flue gas is captured and is separated with Gas phase Smoke;

4) carry out flue dust separation by with in the flue gas feeding bag-type dust of powder ash, powder ash sends into slurrying pond, and flue gas sends into desulfurizing tower desulfurization;

5) add the powder ash in slurrying pond, form high efficiency calciam base desulfurizer slurry with after the solution reaction in slurrying pond.

Described 1), in step, microfine coal is 300-500 object coal dust.

Described 4) in step, powder ash is first sent into powder ash can and is stored, then provides powder ash to slurrying pond timely and appropriately by this powder ash can.

After adopting such scheme, flyash of purifying in a kind of coal dust firing of the present invention produces desulfurizing agent technique, the coal dust adopted is microfine coal, and the high-temperature temperature of boiler inner sealing flame controls within the scope of 1300 DEG C-1500 DEG C, be beneficial to the clay mineral matter of firing in powder and (be mainly SiO2, Al2O3, FeO, Fe2O3) efficient melting adsorb expanding formation bulky grain, after through cooling rapidly, cyclone dust removal seizure effect, realize glass microballoon (i.e. clay mineral matter) to be effectively separated with flue gas ground, afterwards the flue gas being mixed with powder ash (being mainly CaO) is sent into bag-type dust and carry out flue dust separation, powder ash is sent into slurrying pond and is participated in pulping reaction, form high efficiency calciam base desulfurizer slurry thus, this high efficiency calciam base desulfurizer slurry sprays in desulfurizing tower, fully contact hybrid reaction with the flue gas sent in desulfurizing tower and carry out desulfurization.The present invention is in coal dust firing sweetening process, by flyash to be generated of purifying, make the ash of the powder after purification prepare a raw material of desulfurizing agent as slurrying pond, compare conventional process techniques, this technique not only reduces the discharge of flyash, but also provides an effective way for making full use of flyash.

Detailed description of the invention

In order to explain technical scheme of the present invention further, below by specific embodiment, the present invention will be described in detail.

Flyash of purifying in a kind of coal dust firing of this case produces desulfurizing agent technique, purifies in process of coal combustion to flyash contained in flue gas, and the powder ash of purifying is for the production of desulfurizing agent, and the flue gas that this desulfurizing agent can be directly used in producing carries out desulfurization.Present invention process mainly comprises the following steps:

1) microfine coal is sent into high-efficiency pulverized coal boiler combustion by coal dust tower, under control boiler inner sealing flame is in 1300 DEG C of-1500 DEG C of high temperature, clay mineral matter contained in microfine coal now as combustion powder melting form bulky grain at said high temperatures, final combustion powder produces the flue gas containing bulky grain and powder ash;

2) cool rapidly after the flue gas containing bulky grain and powder ash discharges out of the furnace, the bulky grain in flue gas is cooled to glass microballoon rapidly;

3) cyclone dust removal process is carried out to the flue gas containing glass microballoon and powder ash after cooling, thus the glass microballoon in flue gas is captured and is separated with Gas phase Smoke;

4) flue gas with powder ash is carried out flue dust separating treatment, powder ash sends into slurrying pond, and flue gas sends into desulfurizing tower desulfurization;

5) add the powder ash in slurrying pond, form high efficiency calciam base desulfurizer slurry with after the solution reaction in slurrying pond, this high efficiency calciam base desulfurizer slurry sprays into desulfurizing tower, fully contacts hybrid reaction carry out desulfurization with the flue gas sent in desulfurizing tower.

Described 1) in step, microfine coal burn-off rate is high, and it preferably adopts 300-500 order microfine coal, practice middle employing 400 order, fine coal tower, for storing up for coal dust, requires that safe storage, accurate measurement are for powder, continuing and stablely to supply and active combustion provides safeguard for boiler internal combustion powder.Special control overflow is had to the temperature of closed flame in boiler, specifically control under 1300 DEG C of-1500 DEG C of high temperature, preferably control at about 1400 DEG C, this temperature is the melt temperature value of clay mineral matter in combustion powder, after this clay mineral matter melting, under surface tension effects, form drop, drop stirs collision (melting particulate binder strong) and adsorbs expanding formation bulky grain in high-speed motion.In order to meet described flame temperature requirement, described boiler adopts burner bottom type structure especially, form the high-efficiency pulverized coal boiler that a combustion thermal efficiency is high, particular by deep or light Grate-firing, and make full use of SOFA air deep-graded technology, reduce temperature in burner hearth, elongate combustion flame, make flame temperature control to be implemented, and which also effectively control coking problem in discharged nitrous oxides and burner hearth, has increased substantially the boiler combustion thermal efficiency.

Described 2) in step, enter in air preheater after flue gas containing bulky grain and powder ash discharges out of the furnace, by air preheater, (concrete cooling rate be per second drop to about 170-140 DEG C from about 1100-1200 DEG C) is cooled rapidly to flue gas, bulky grain is made to be cooled to glass microballoon rapidly, just because combustion powder is 1) controlled efficient burning can be had in step boiler, make the almost all meltings finally form glass microballoon of the clay mineral matter in combustion powder, according to data display in application, described in become glass microballoon content account for more than 60% of the coal ash total content of collection.

Described 3), in step, send in spiral case cyclone dust collectors the flue gas containing glass microballoon and powder ash after cooling, take cyclone dust removal mode, effectively catch the glass microballoon in flue gas, glass microballoon is separated with the flue gas containing powder ash thus.

Described 4) in step, flue gas with powder ash is sent in bag-type dust and makes flue dust separating treatment, the powder ash be separated can directly send into slurrying pond, preferably first sends into the powder ash can be positioned at above slurrying pond and stores, and provides appropriate powder ash to slurrying pond as required afterwards by powder ash can.Described bag-type dust mechanism preferably will collect and store in a warehouse integrated design, by one cyclonic dust collector and secondary bag collector (being positioned at the powder storehouse of one cyclonic dust collector lower position) combination, be beneficial to collection and the conveying accumulating of powder ash.

Described 5) in step, the powder ash of purifying, collecting adds slurrying pond as a kind of raw material preparing desulfurizing agent, with the industrial wastes in slurrying pond and reclaim waste water under the chemicals such as dispersant and stabilizing agent fusion, by physically activated and chemical activation (such as infrared radiation) method, activation modification is carried out to it through mechanical agitation, improve powder ash CaO or Ca(OH) 2 excite, end reaction synthesizing efficient calcium-based desulfurizing agent slurries (main component CaO powder ash).This high efficiency calciam base desulfurizer slurry is directly sprayed into desulfurizing tower as the desulfurizing agent of flue gas, and with the flue gas containing SO2 sent in desulfurizing tower under the effect of pneumatic hurricane vortex, fully contact hybrid reaction produces CaSO3, realizes flue gas desulfurization effect.The CaSO3 produced finally enters the intermediate pool of desulphurization system, by Oxygenation, generates dihydrate gypsum, forms commercialization gypsum after press filtration of anhydrating.

To sum up, flyash of purifying in coal dust firing of the present invention produces desulfurizing agent technique, existing coal dust firing and sulfur removal technology basis are improved, the technology that each step of technique comprises complements each other, the high efficiency realizing the flyash in flue gas is purified, and the powder ash after this purification is prepared a raw material of desulfurizing agent as slurrying pond, the desulfurizing agent obtained is directly used in the desulfurization of flue gas, compare conventional process techniques, this technique not only reduces the discharge of flyash, but also provides an effective way for making full use of flyash.

Above-described embodiment and graphic and non-limiting product form of the present invention this and style, any person of an ordinary skill in the technical field, to its suitable change done or modification, all should be considered as not departing from patent category of the present invention.

Claims (3)

1. flyash of purifying in coal dust firing produces a desulfurizing agent technique, it is characterized in that: mainly comprise the following steps:
1) microfine coal is sent into high-efficiency pulverized coal boiler combustion by coal dust tower, under control boiler inner sealing flame is in 1300 DEG C of-1500 DEG C of high temperature, clay mineral matter contained in microfine coal now as combustion powder melting form bulky grain at said high temperatures, final combustion powder produces the flue gas containing bulky grain and powder ash;
2) cool rapidly after the flue gas containing bulky grain and powder ash discharges out of the furnace, the bulky grain in flue gas is cooled to glass microballoon rapidly;
3) cyclone dust removal process is carried out to the flue gas containing glass microballoon and powder ash after cooling, thus the glass microballoon in flue gas is captured and is separated with Gas phase Smoke;
4) carry out flue dust separation by with in the flue gas feeding bag-type dust of powder ash, powder ash sends into slurrying pond, and flue gas sends into desulfurizing tower desulfurization;
5) add the powder ash in slurrying pond, form high efficiency calciam base desulfurizer slurry with after the solution reaction in slurrying pond.
2. flyash of purifying in a kind of coal dust firing as claimed in claim 1 produces desulfurizing agent technique, and it is characterized in that: described 1) in step, microfine coal is 300-500 object coal dust.
3. flyash of purifying in a kind of coal dust firing as claimed in claim 1 produces desulfurizing agent technique, it is characterized in that: described 4) in step, and powder ash is first sent into powder ash can and stored, then provides powder ash to slurrying pond timely and appropriately by this powder ash can.
CN201310030087.2A 2013-01-25 2013-01-25 Process for extracting coal ash to produce desulfurizer in pulverized coal combustion CN103084057B (en)

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CN103599691A (en) * 2013-11-22 2014-02-26 赵长兴 Technology and system for removing dust and sulfur by using coal ash
CN105056636A (en) * 2015-07-18 2015-11-18 常州市鼎日环保科技有限公司 Method for removing inhalable particles in atmosphere

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CN1887769A (en) * 2006-07-16 2007-01-03 葛东海 Production process with modified fly ash to replace cement clinker
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Publication number Priority date Publication date Assignee Title
CN2196244Y (en) * 1994-01-29 1995-05-03 北京科技大学 Dust removing lump coal burner
CN1887769A (en) * 2006-07-16 2007-01-03 葛东海 Production process with modified fly ash to replace cement clinker
CN101636559A (en) * 2007-01-15 2010-01-27 西门子Vai金属科技有限责任公司 Be used for method and apparatus at combustion gas and steam turbine (GuD) power station generation electric energy
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Application publication date: 20130508

Assignee: Jinjiang Meichuang Environmantal Protection Equipment Co., Ltd.

Assignor: Fujian Eternal Energy Management Co., Ltd.

Contract record no.: 2016350000044

Denomination of invention: Process for extracting coal ash to produce desulfurizer in pulverized coal combustion

Granted publication date: 20150311

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Record date: 20161107

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