CN103084057A - 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

Info

Publication number
CN103084057A
CN103084057A CN2013100300872A CN201310030087A CN103084057A CN 103084057 A CN103084057 A CN 103084057A CN 2013100300872 A CN2013100300872 A CN 2013100300872A CN 201310030087 A CN201310030087 A CN 201310030087A CN 103084057 A CN103084057 A CN 103084057A
Authority
CN
China
Prior art keywords
ash
coal
flue gas
powder ash
powder
Prior art date
Application number
CN2013100300872A
Other languages
Chinese (zh)
Other versions
CN103084057B (en
Inventor
张榕杰
黄世峰
韩枝宏
黄成梠
赵雪
俞建洪
Original Assignee
福建永恒能源管理有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 福建永恒能源管理有限公司 filed Critical 福建永恒能源管理有限公司
Priority to CN201310030087.2A priority Critical patent/CN103084057B/en
Publication of CN103084057A publication Critical patent/CN103084057A/en
Application granted granted Critical
Publication of CN103084057B publication Critical patent/CN103084057B/en

Links

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

In a kind of coal dust firing, purification flyash is produced desulfurizing agent technique

Technical field

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

Background technology

Flyash is one of main solid waste of coal-burning power plant's discharge, is also one of larger industrial residue of the current discharge capacity of China, 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 processing, will produce airborne dust, atmosphere pollution; Can cause the river to silt up if enter water system, and toxic chemical substance wherein also can work the mischief to human body and biology.Present flyash mainly is used as concrete admixture and is utilized, and it utilizes speed still to be unable to catch up with the mass rate of emission of flyash far away, thus, and for coal ash lifting supplies a kind of more efficiently comprehensive Utilization Ways extremely urgent.The main oxides of power plants flyash forms to be had: SiO2, Al2O3, FeO, Fe2O3, CaO, TiO2 etc., wherein SiO2, Al2O3 occupy 50%-70%, CaO still occupies 7%-15%, this CaO still can take full advantage of by withdrawing deposit, the inventor furthers investigate thus, from the existing contained CaO of flyash, by improving pulverized coal combustion, invented purification flyash production desulfurizing agent technique in a kind of coal dust firing, this case produces thus.

Summary of the invention

The object of the present invention is to provide in a kind of coal dust firing purification flyash to produce desulfurizing agent technique, for the discharging that reduces flyash and take full advantage of coal ash lifting and supplied an effective way.

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

In a kind of coal dust firing, purification flyash is produced desulfurizing agent technique, mainly comprises the following steps:

1) microfine coal is sent into high-efficiency pulverized coal boiler internal combustion by the coal dust tower, controlling boiler inner sealing flame is under 1300 ℃ of-1500 ℃ of high temperature, finally fire powder and produce the flue gas that contain bulky grain and powder ash as the melting and form bulky grain under described high temperature of contained clay mineral matter in the microfine coal of combustion powder this moment;

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

3) flue gas that contains glass microballoon and powder ash after cooling is carried out cyclone dust removal and process, thereby the glass microballoon in flue gas is captured and separates with Gas phase Smoke;

4) will send into the flue gas of powder ash and carry out flue dust in bag-type dust and separate, the powder ash is sent into the slurrying pond, and flue gas is sent into the desulfurizing tower desulfurization;

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

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

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

after adopting such scheme, in a kind of coal dust firing of the present invention, purification flyash is produced desulfurizing agent technique, the coal dust that adopts is microfine coal, and the high-temperature temperature of boiler inner sealing flame is controlled in 1300 ℃ of-1500 ℃ of scopes, the clay mineral matter that is beneficial to fire in powder (is mainly SiO2, Al2O3, FeO, Fe2O3) efficient melting and adsorb hole enlargement and form bulky grain, afterwards through cooling rapidly, cyclone dust removal seizure effect, realize that glass microballoon (being clay mineral matter) effectively separates with flue gas ground, the flue gas that will be mixed with afterwards powder ash (being mainly CaO) is sent into bag-type dust and is carried out flue dust and separate, the powder ash is sent into slurrying pond participation pulping reaction, form thus the high efficiency calciam base desulfurizer slurry, this high efficiency calciam base desulfurizer slurry sprays in desulfurizing tower, fully contact hybrid reaction and carry out desulfurization with the flue gas in sending into desulfurizing tower.The present invention is in the coal dust firing sweetening process, by the flyash to be generated of purifying, make the powder ash after purification prepare a raw material of desulfurizing agent as the slurrying pond, compare conventional process techniques, this technique has not only reduced the discharging of flyash, but also has supplied an effective way for taking full advantage of coal ash lifting.

The specific embodiment

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

In a kind of coal dust firing of this case, purification flyash is produced desulfurizing agent technique, in process of coal combustion, flyash contained in flue gas is purified, purify the powder ash for the production of desulfurizing agent, the flue gas that this desulfurizing agent can be directly used in producing carries out desulfurization.Technique of the present invention mainly comprises the following steps:

1) microfine coal is sent into high-efficiency pulverized coal boiler internal combustion by the coal dust tower, controlling boiler inner sealing flame is under 1300 ℃ of-1500 ℃ of high temperature, finally fire powder and produce the flue gas that contain bulky grain and powder ash as the melting and form bulky grain under described high temperature of contained clay mineral matter in the microfine coal of combustion powder this moment;

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

3) flue gas that contains glass microballoon and powder ash after cooling is carried out cyclone dust removal and process, thereby the glass microballoon in flue gas is captured and separates with Gas phase Smoke;

4) will carry out the flue dust separating treatment with the flue gas of powder ash, the powder ash is sent into the slurrying pond, and flue gas is sent into the desulfurizing tower desulfurization;

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

Described 1) in step, the microfine coal burn-off rate is high, and it preferably adopts 300-500 order microfine coal, practice middle employing 400 orders, the fine coal tower is used for storage for coal dust, requires safe storage, accurate measurement for powder, is continuing and stable supply and active combustion provides safeguard of boiler internal combustion powder.In boiler, the temperature of sealing flame there is special control requirement, specifically be controlled under 1300 ℃ of-1500 ℃ of high temperature, preferably be controlled at 1400 ℃ of left and right, this temperature is the melt temperature value of clay mineral matter in the combustion powder, after this clay mineral matter melting, form drop under surface tension effects, drop stirs collision (melting particulate caking property strong) absorption hole enlargement and forms bulky grain in high-speed motion.In order to satisfy described flame temperature requirement, described boiler adopts burner bottom type structure especially, consist of the high high-efficiency pulverized coal boiler of a combustion thermal efficiency, specifically pass through deep or light Grate-firing, and take full advantage of SOFA air deep-graded technology, reduce temperature in burner hearth, elongate combustion flame, flame temperature is controlled implemented, and this mode also has effect to control coking problem in discharged nitrous oxides and burner hearth, increased substantially the boiler combustion thermal efficiency.

Described 2) in step, after discharging out of the furnace, the flue gas that contains bulky grain and powder ash enters in air preheater, by air preheater to flue gas cool rapidly (concrete cooling rate be per second from approximately 1100-1200 ℃ drop to approximately 170-140 ℃), make bulky grain be cooled to rapidly glass microballoon, just due to the combustion powder 1) can have controlled efficient burning in the step boiler, make the interior clay mineral matter of combustion powder almost whole meltings and the final glass microballoon that forms, show according to data in using, the described content that becomes glass microballoon accounts for more than 60% of coal ash total content of collection.

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

Described 4) in step, to send into the flue gas of powder ash and make the flue dust separating treatment in bag-type dust, the powder ash that separates can directly be sent into the slurrying pond, preferably first sends into the powder ash can that is positioned at top, slurrying pond and stores, and provides appropriate powder ash to the slurrying pond by the powder ash can as required afterwards.The integrated design of preferably will collecting and store in a warehouse of described bag-type dust mechanism is about to the combination of one-level cyclone dust removal collector and secondary bag collector (being positioned at the powder storehouse of one-level cyclone dust removal collector lower position), is beneficial to the collection of powder ash and carries accumulating.

Described 5) in step, the powder ash of purifying, collecting adds the slurrying pond as a kind of raw material of preparation desulfurizing agent, with industrial wastes in the slurrying pond with reclaim waste water under the chemicals fusions such as dispersant and stabilizing agent, by physically activated and chemical activation (such as infrared radiation) method, it is carried out activation modification 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 send into the flue gas that contains SO2 in desulfurizing tower under the effect of pneumatic hurricane vortex, fully contact hybrid reaction and produce CaSO3, realize the flue gas desulfurization effect.The CaSO3 that produces enters the intermediate pool of desulphurization system at last, by Oxygenation, generates dihydrate gypsum, forms the commercialization gypsum after the press filtration of anhydrating.

To sum up, in coal dust firing of the present invention, purification flyash is produced desulfurizing agent technique, improved on existing coal dust firing and sulfur removal technology basis, the technology that each step of technique comprises complements each other, realize the high efficiency purification of the flyash in flue gas, and the powder ash after purifying prepares a raw material of desulfurizing agent as the slurrying pond, the desulfurizing agent that obtains is directly used in the desulfurization of flue gas, compare conventional process techniques, this technique has not only reduced the discharging of flyash, but also has supplied an effective way for taking full advantage of coal ash lifting.

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

Claims (3)

1. in a coal dust firing, purification flyash is produced desulfurizing agent technique, it is characterized in that: mainly comprise the following steps:
1) microfine coal is sent into high-efficiency pulverized coal boiler internal combustion by the coal dust tower, controlling boiler inner sealing flame is under 1300 ℃ of-1500 ℃ of high temperature, finally fire powder and produce the flue gas that contain bulky grain and powder ash as the melting and form bulky grain under described high temperature of contained clay mineral matter in the microfine coal of combustion powder this moment;
2) cool rapidly after the flue gas that contains bulky grain and powder ash discharges out of the furnace, the bulky grain in flue gas is cooled to glass microballoon rapidly;
3) flue gas that contains glass microballoon and powder ash after cooling is carried out cyclone dust removal and process, thereby the glass microballoon in flue gas is captured and separates with Gas phase Smoke;
4) will send into the flue gas of powder ash and carry out flue dust in bag-type dust and separate, the powder ash is sent into the slurrying pond, and flue gas is sent into the desulfurizing tower desulfurization;
5) add the powder ash in slurrying pond, and form the high efficiency calciam base desulfurizer slurry after solution reaction in the slurrying pond.
2. in a kind of coal dust firing as claimed in claim 1, purification flyash is produced desulfurizing agent technique, and it is characterized in that: described 1) in step, microfine coal is 300-500 purpose coal dust.
3. in a kind of coal dust firing as claimed in claim 1, purification flyash is produced desulfurizing agent technique, it is characterized in that: described 4) in step, the powder ash is first sent into the storage of powder ash can, then provides timely and appropriately the powder ash to the slurrying pond 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)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310030087.2A CN103084057B (en) 2013-01-25 2013-01-25 Process for extracting coal ash to produce desulfurizer in pulverized coal combustion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310030087.2A CN103084057B (en) 2013-01-25 2013-01-25 Process for extracting coal ash to produce desulfurizer in pulverized coal combustion

Publications (2)

Publication Number Publication Date
CN103084057A true CN103084057A (en) 2013-05-08
CN103084057B CN103084057B (en) 2015-03-11

Family

ID=48197493

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310030087.2A CN103084057B (en) 2013-01-25 2013-01-25 Process for extracting coal ash to produce desulfurizer in pulverized coal combustion

Country Status (1)

Country Link
CN (1) CN103084057B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (5)

* Cited by examiner, † Cited by third party
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
JPH09257228A (en) * 1996-03-22 1997-09-30 Nkk Corp Charging method of coal ash in melting method of coal ash
CN1887769A (en) * 2006-07-16 2007-01-03 葛东海 Production process with modified fly ash to replace cement clinker
CN101502745A (en) * 2009-02-13 2009-08-12 史汉祥 Method for absorbing sulfuric dioxide in flue gas using fly ash as absorbing agent
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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
JPH09257228A (en) * 1996-03-22 1997-09-30 Nkk Corp Charging method of coal ash in melting method of coal ash
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
CN101502745A (en) * 2009-02-13 2009-08-12 史汉祥 Method for absorbing sulfuric dioxide in flue gas using fly ash as absorbing agent

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
庆承松,任升莲,宋传中: "电厂粉煤灰的特征及其综合利用", 《合肥工业大学学报(自然科学版)》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
CN103084057B (en) 2015-03-11

Similar Documents

Publication Publication Date Title
CN104857835B (en) Flue gas integrated treatment unit and method
CN103557526B (en) Dangerous waste and medical waste incinerator complexes and incinerating method thereof
CN105214457B (en) A kind of fume desulfuring and denitrifying Processes and apparatus
CN102041131B (en) High-temperature sulfur solidifying agent for desulfurization in coal blending burner
TWI590258B (en) Method and apparatus for removing radioactive cesium
CN1259525C (en) Method of processing refuse burning fly ash through cyclone furnace high temperature melting
ES2526721T3 (en) Procedures and devices to reduce dangerous air pollutants
CN102512927B (en) Integrated flue gas desulfurizing and denitrating purification system and purification technology for same
CA2721677C (en) Capture and sequestration of carbon dioxide in flue gases
Sun et al. Sequestration of carbon dioxide by indirect mineralization using Victorian brown coal fly ash
CN102895857B (en) Comprehensive waste incineration flue gas purification system and purification method thereof
CN101648099B (en) Purifying treatment device and purifying treatment method for flue gas multicomponent pollutant generated by incinerating refuse
US9895657B2 (en) High-efficiency method for removing sulfur and mercury of coal-fired flue gas, and apparatus thereof
CN103771734B (en) A kind of mass-producing calcination processing utilizes the method for electrolytic manganese residues
CN105091615B (en) A kind of integrated conduct method of agglomeration for iron mine flue gas pollutant
Ji et al. CO2 sequestration by direct mineralisation using fly ash from Chinese Shenfu coal
CN101407864B (en) Method for secondarily extracting gallium and germanium from fly ash
CN101797470B (en) Method for circularly trapping SO2 and CO2 by using calcium-based absorbent
CN101559323B (en) Digestive circulating fluid bed flue gas desulfurization method and device
CN103264044B (en) A kind of method of heavy metal and dioxin in collaborative removal refuse incinerating flyash
CN103075727B (en) High-efficiency and environment-friendly coal-fired system for vertical boiler with bottom-built burner
CN102303883B (en) Method for preparing calcium oxide and sulfur by double-atmosphere fluidized roasting of desulfurated gypsum
KR102002193B1 (en) Dry sorbent injection during non-steady state conditions in dry scrubber
CN205127642U (en) Dust removal purification system of lime production line
CN203923026U (en) A kind of system of cement kiln synergic processing domestic refuse

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
LICC Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model
EE01 Entry into force of recordation of patent licensing contract

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

License type: Exclusive License

Record date: 20161107