CN107261815A - A kind of circulating fluidized bed combustion coal boiler in-furnace desulfurization method - Google Patents
A kind of circulating fluidized bed combustion coal boiler in-furnace desulfurization method Download PDFInfo
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- CN107261815A CN107261815A CN201710647777.0A CN201710647777A CN107261815A CN 107261815 A CN107261815 A CN 107261815A CN 201710647777 A CN201710647777 A CN 201710647777A CN 107261815 A CN107261815 A CN 107261815A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/602—Oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to boiler in-furnace desulfurization technical field, a kind of circulating fluidized bed combustion coal boiler in-furnace desulfurization method is specifically disclosed, is comprised the following steps：(1) wet white clay is transported in roller dryer, hot blast carries out drying and processing；(2) the primary extra dry white wine mud after step (1) processing is transported in whole optional equipment and carries out whole choosing；(3) tail gas produced during step (1) is transported to progress dust recovery in deduster；(4) the white clay dust for collecting step (3), which is transported in whole optional equipment, mixes whole choosing with primary white clay；(5) it will be transported to by the white clay after the whole choosing of whole optional equipment by variable grain magnitude classification stand-by in extra dry white wine hopper dredger；(6) desulfurizing agent stored in extra dry white wine hopper dredger is transported to by feed valve it is dense into storehouse pump, it is dense that desulfurizing agent is transported in desulfurization powder cabin by outlet valve again to storehouse pump；(7) desulfurizing agent is sprayed into stove.It is of the invention will to be effectively saved water resource, improve desulfuration in furnace effect.
Description
Technical field
The present invention relates to boiler in-furnace desulfurization technical field, and in particular to a kind of circulating fluidized bed combustion coal boiler in-furnace desulfurization
Method.
Background technology
The sulfur dioxide that fire coal is produced is also known as sulfurous acid raised path between farm fields, and chemical formula is S02.There are the colourless gas for irritating and hiding.For giving birth to
Produce sulphur and be used as insecticide, bactericide, bleaching agent and reducing agent.In an atmosphere, S02 can be aoxidized into sulfuric acid mist or sulfate
Aerosol, is the important predecessor of environmental acidification.S02 concentration has potential impact in more than 0.5ppm to people's private savings in air；1
Majority start to feel to irritate during~3ppm；In 400~500ppm, routed room and pulmonary edema occurs until death by suffocation in people.
S02 has synergy with the flue dust in air.When in air S02 concentration be 0.21ppm, dust concentration be more than 0.3mg/m3 when,
It can increase the breathing problem incidence of disease, the state of an illness of chronic deteriorates rapidly.Such as smog episode in london, Maas river valley event
All it is this harm for acting synergistically and causing with the smog episode such as many Nolas.World today's environmental Global and national environmental protection political affairs
Plan carries out " energy-saving and emission-reduction, overall control ", and a upper new platform is pitched in environmental protection, energy-saving and emission-reduction in national " 12 " planning
Rank.It should also be attained a new height for the technological design of this coal burning flue gas desulfurization technical equipment.
China is main in the world coal production and country of consumption, is also the country using coal as main primary energy.Coal
Containing pollutants such as substantial amounts of sulfur dioxide, nitrogen oxides and heavy metals in the flue gas that charcoal burning is produced, serious ring is caused
Pollute in border.According to《2012 China Environmental State Bulletins》, national SO 2 in waste gas discharge capacity is up to 2117.6 ten thousand within 2012
Ton, and thermal power generation is always one of main body of sulfur dioxide (SO2) emissions.To strengthen environmental protection, realizing target for energy-saving and emission-reduction,《Fire
Power plant's atmosphere pollutants emission standardses》(GB13223-2011) provide：Positioned at Guangxi Zhuang Autonomous Region, Chongqing City, Sichuan Province and
The existing thermal power generation boiler in Guizhou Province performs 400mg/m3 sulfur dioxide (SO2) emissions limit value, newly-built thermal power generation boiler and performed
200mg/m3 sulfur dioxide (SO2) emissions limit value, the existing thermal power generation boiler of other non-key areas performs 200mg/m3 dioxy
Change the sulfur dioxide (SO2) emissions limit value that sulphur emissions limit value, newly-built thermal power generation boiler perform 100mg/m3, for the fire of key area
Power electricity generation boiler, the emission limit of sulfur dioxide is only 50mg/m3.
It is known that China be CFBB installed capacity and installation number of units at most, unit parameter highest state
Family, traditional CFBB relies primarily on desulfuration in furnace, after newest environmental protection standard is put into effect these boilers need mostly into
Row technological transformation.Domestic desulfurization technology is based on lime stone gypsum wet at present, and limestone-gypsum wet desulfuration technique needs
Consume substantial amounts of water resource, the gypsum discarded object of generation is difficult comprehensive utilization, water resources shortage, ecological environment frailty in northwest
Area is difficult to adopt, and operating cost is high in addition, if CFBB is using lime stone gypsum wet very expensive, extensively
The big thermal power plant using CFBB is limited less in the urgent need to a kind of application conditions, water consume is low and efficiency high de-
Sulphur technology, the transformation for new-built unit and original unit.
The content of the invention
It is an object of the invention to：Need to expend a large amount of water moneys for the desulphurization in circulating fluidized bed boiler of prior art
Source, and the gypsum discarded object produced the problem of be difficult to utilize there is provided a kind of circulating fluidized bed combustion coal boiler in-furnace desulfurization method, this
The useless white clay produced during paper conversion can be used for desulfuration in furnace by method, be effectively saved water resource, improved desulfuration in furnace
Effect.
The technical solution adopted by the present invention is as follows：
A kind of circulating fluidized bed combustion coal boiler in-furnace desulfurization method, comprises the following steps：
It is prepared by desulfurizing agent：
(1) the wet white clay of clay shape is transported in roller dryer, temperature in use is 600 DEG C -1050 DEG C of hot blast
Carry out drying and processing；
(2) the primary extra dry white wine mud after step (1) processing is transported in whole optional equipment and carries out whole choosing；
(3) tail gas produced during step (1) is transported to progress dust recovery in deduster；
(4) the white clay dust for collecting step (3), which is transported in whole optional equipment, mixes whole choosing with primary white clay；
(5) it will be transported in extra dry white wine hopper dredger and pack by variable grain magnitude classification by the white clay after the whole choosing of whole optional equipment
It is stand-by.
Desulfuration in furnace：
(6) desulfurizing agent stored in extra dry white wine hopper dredger is transported to by feed valve it is dense into storehouse pump, it is dense to pass through again to storehouse pump
Desulfurizing agent is transported in desulfurization powder cabin by outlet valve；
(7) desulfurizing agent in desulfurization powder cabin passes through the heating of heater, then is pumped into boiler furnace by conveying
Row desulphurization reaction；Desulfurizing agent is sprayed into stove, the main component of desulfurizing agent is CaCO3, and CaCO3 meets high-temp combustion in stove, raw
Into CaO, CaO is discharged with the reaction generation CaSO4 and CaSO3, CaSO4 and CaSO3 in flue gas with bottom ash.
Preferably, white clay powder component made from step (5) is：Calcium carbonate (CaCO3) >=92%, limestone granularity (≤
1mm) >=90%, moisture content≤2%.
Preferably, step (3) also includes Tail gas measuring step：Tail gas after dust removal process is detected, row is reached
Put after standard, pump and be discharged into air by air-introduced machine.
Preferably, fluidized bed furnace supply of the hot blast in step (1) in workshop.
Preferably, the whole optional equipment is drum sieve.
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1st, because the desulphurization in circulating fluidized bed boiler of prior art needs to expend great lot of water resources, and the gypsum produced
Discarded object is difficult to utilize；Circulating fluidized bed combustion coal boiler in-furnace desulfurization method of the present invention, changes original desulfurization method, by bamboo pulp
Manufacturing process is processed further into the wet white clay of generation, is used as desulfurizing agent, improves the effect of boiler in-furnace desulfurization, is saved
Water resource, while also providing new method to handle useless white clay in paper mill, realizes refuse reclamation.
2nd, circulating fluidized bed combustion coal boiler in-furnace desulfurization method of the present invention, can will make the wet white clay produced during bamboo pulp
Recycle, by the processing of this method, be processed into the extra dry white wine mud powder of variable grain size, for substituting agstone, as
The desulfurizing agent of coal-burning boiler is used, and is efficiently solved the wet lime mud treatment difficult problem produced in papermaking process, is improved
Wet white clay reuses efficiency, has saved raw material.
3rd, wet white clay is in drying course, because adhesion degree is different, and the white clays of some lighter weights takes the lead in drying, is changed into
It is powdered, easily follow exhaust emissions to go out, cause the waste of white clay powder, the deduster that the inventive method is set can be by tail gas
The powder being mingled with is collected, then is transported in screening plant and is screened, and improves the organic efficiency of white clay, improves raw material profit
Use efficiency.
4th, this many chemical reagent is remained in wet white clay, causes these reagents to volatilize during wet white clay is dried, is held
The problem of easily causing air pollution, in order to solve this problem, the present invention adds Tail gas measuring device in dryer exhaust outlet,
Only after the air of discharge reaches discharge standard, just allow it to be discharged into air, improve the Environmental Protection Level of the present apparatus.
5th, during bamboo pulp is made, the hot gas that fluidized bed furnace is produced often is not used, causes the wasting of resources, the present invention
Method makes full use of the hot gas that fluidized bed furnace is produced, and improves the utilization ratio of the energy.
6th, it is that the reduction of external desulfurzation tower creates condition using CaO because extra dry white wine mud has about 15% superfine CaCO-3,
Actual motion desulfurized effect, economic and social benefit are good, realize the target of comprehensive utilization of waste materials.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of circulating fluidized bed combustion coal boiler in-furnace desulfurization method of the present invention；
Fig. 2 is inventive desulfurization agent preparation flow schematic diagram.
Embodiment
All features disclosed in this specification, can be with any in addition to mutually exclusive feature and/or step
Mode is combined.
The present invention is elaborated with reference to Fig. 1.
A kind of embodiment 1, circulating fluidized bed combustion coal boiler in-furnace desulfurization method, comprises the following steps：
(1) the wet white clay of clay shape is transported in roller dryer, temperature in use is dried for 700 DEG C of hot blast
Processing；Further, fluidized bed furnace supply of the hot blast in the step of the inventive method (1) in workshop.
(2) the primary extra dry white wine mud after step (1) processing is transported in whole optional equipment and carries out whole choosing；Further,
The whole optional equipment of the inventive method is drum sieve.
(3) tail gas produced during step (1) is transported to progress dust recovery in deduster；
(4) the white clay dust for collecting step (3), which is transported in whole optional equipment, mixes whole choosing with primary white clay；
(5) it will be transported in extra dry white wine hopper dredger and pack by variable grain magnitude classification by the white clay after the whole choosing of whole optional equipment
It is stand-by.
(6) desulfurizing agent stored in extra dry white wine hopper dredger is transported to by feed valve it is dense into storehouse pump, it is dense to pass through again to storehouse pump
Desulfurizing agent is transported in desulfurization powder cabin by outlet valve；
(7) desulfurizing agent in desulfurization powder cabin passes through the heating of heater, then is pumped into boiler furnace by conveying
Row desulphurization reaction；Desulfurizing agent is sprayed into stove, the main component of desulfurizing agent is CaCO3, and CaCO3 meets high-temp combustion in stove, raw
Into CaO, CaO is discharged with the reaction generation CaSO4 and CaSO3, CaSO4 and CaSO3 in flue gas with bottom ash.
Further, white clay powder component made from step (5) is：Calcium carbonate (CaCO3) is 92%, limestone granularity (≤
It is 1mm) that 90%, moisture content is 2%.
A kind of embodiment 2, circulating fluidized bed combustion coal boiler in-furnace desulfurization method, comprises the following steps：
(1) the wet white clay of clay shape is transported in roller dryer, temperature in use is dried for 1000 DEG C of hot blast
Dry-cure；Further, fluidized bed furnace supply of the hot blast in the step of the inventive method (1) in workshop.
(2) the primary extra dry white wine mud after step (1) processing is transported in whole optional equipment and carries out whole choosing；Further,
The whole optional equipment of the inventive method is drum sieve.
(3) tail gas produced during step (1) is transported to progress dust recovery in deduster；
(4) the white clay dust for collecting step (3), which is transported in whole optional equipment, mixes whole choosing with primary white clay；
(5) it will be transported in extra dry white wine hopper dredger and pack by variable grain magnitude classification by the white clay after the whole choosing of whole optional equipment
It is stand-by.
(6) desulfurizing agent stored in extra dry white wine hopper dredger is transported to by feed valve it is dense into storehouse pump, it is dense to pass through again to storehouse pump
Desulfurizing agent is transported in desulfurization powder cabin by outlet valve；
(7) desulfurizing agent in desulfurization powder cabin passes through the heating of heater, then is pumped into boiler furnace by conveying
Row desulphurization reaction；Desulfurizing agent is sprayed into stove, the main component of desulfurizing agent is CaCO3, and CaCO3 meets high-temp combustion in stove, raw
Into CaO, CaO is discharged with the reaction generation CaSO4 and CaSO3, CaSO4 and CaSO3 in flue gas with bottom ash.
Further, white clay powder component made from step (5) is：Calcium carbonate (CaCO3) is 92%, limestone granularity (≤
It is 1mm) that 90%, moisture content is 2%.
Further, the step of the inventive method (3) also includes Tail gas measuring step：Tail gas after dust removal process is carried out
Detection, reaches after discharge standard, pumps and be discharged into air by air-introduced machine.
It is embodiments of the invention as described above.The present invention is not limited to the above-described embodiments, anyone should learn that
The structure change made under the enlightenment of the present invention, the technical schemes that are same or similar to the present invention each fall within this
Within the protection domain of invention.
Claims (5)
1. a kind of circulating fluidized bed combustion coal boiler in-furnace desulfurization method, it is characterised in that comprise the following steps：
It is prepared by desulfurizing agent：
(1) the wet white clay of clay shape is transported in roller dryer, temperature in use is carried out for 600 DEG C -1050 DEG C of hot blast
Drying and processing；
(2) the primary extra dry white wine mud after step (1) processing is transported in whole optional equipment and carries out whole choosing；
(3) tail gas produced during step (1) is transported to progress dust recovery in deduster；
(4) the white clay dust for collecting step (3), which is transported in whole optional equipment, mixes whole choosing with primary white clay；
(5) it will be transported to by the white clay after the whole choosing of whole optional equipment by variable grain magnitude classification stand-by in extra dry white wine hopper dredger；Stove
Interior desulfurization：
(6) desulfurizing agent stored in extra dry white wine hopper dredger is transported to by feed valve it is dense into storehouse pump, it is dense to storehouse pump again pass through discharging
Desulfurizing agent is transported in desulfurization powder cabin by valve；
(7) desulfurizing agent in desulfurization powder cabin passes through the heating of heater, then is taken off by conveying to be pumped into boiler furnace
Reaction of Salmon-Saxl；Desulfurizing agent is sprayed into stove, the main component of desulfurizing agent is CaCO3, and CaCO3 meets high-temp combustion in stove, is generated
CaO, CaO are discharged with the reaction generation CaSO4 and CaSO3, CaSO4 and CaSO3 in flue gas with bottom ash.
2. circulating fluidized bed combustion coal boiler in-furnace desulfurization method as claimed in claim 1, it is characterised in that：Step (5) is made
White clay powder component be：Calcium carbonate (CaCO3) >=92%, limestone granularity (≤1mm) >=90%, moisture content≤2%.
3. circulating fluidized bed combustion coal boiler in-furnace desulfurization method as claimed in claim 1, it is characterised in that：Step (3) is also wrapped
Include Tail gas measuring step：Tail gas after dust removal process is detected, reached after discharge standard, pumps and is discharged into by air-introduced machine
In air.
4. circulating fluidized bed combustion coal boiler in-furnace desulfurization method as claimed in claim 1, it is characterised in that：In step (1)
Fluidized bed furnace supply of the hot blast in workshop.
5. circulating fluidized bed combustion coal boiler in-furnace desulfurization method as claimed in claim 1, it is characterised in that：The whole optional equipment
For drum sieve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710647777.0A CN107261815A (en) | 2017-08-01 | 2017-08-01 | A kind of circulating fluidized bed combustion coal boiler in-furnace desulfurization method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710647777.0A CN107261815A (en) | 2017-08-01 | 2017-08-01 | A kind of circulating fluidized bed combustion coal boiler in-furnace desulfurization method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1840109A1 (en) * | 2006-03-28 | 2007-10-03 | GFR GESELLSCHAFT FÜR DIE AUFBEREITUNG UND VERWERTUNG VON RESTSTOFFEN mbH | Sulphur containing lime fertilizers |
| CN102718373A (en) * | 2011-11-01 | 2012-10-10 | 山东大学 | Method for treating white mud produced by papermaking and use of the white mud treated by the method in removal of CO2 in tail flue gas from coal-fired boiler |
| CN102777921A (en) * | 2012-07-12 | 2012-11-14 | 广东电网公司电力科学研究院 | System and method for carrying out mercury removal and sulfur fixation on pulverized coal boiler by using white mud |
| CN205138078U (en) * | 2015-09-11 | 2016-04-06 | 浙江天蓝环保技术股份有限公司 | Energy -saving calcium base desulfurizer and desulfurized gypsum drying system |
-
2017
- 2017-08-01 CN CN201710647777.0A patent/CN107261815A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1840109A1 (en) * | 2006-03-28 | 2007-10-03 | GFR GESELLSCHAFT FÜR DIE AUFBEREITUNG UND VERWERTUNG VON RESTSTOFFEN mbH | Sulphur containing lime fertilizers |
| CN102718373A (en) * | 2011-11-01 | 2012-10-10 | 山东大学 | Method for treating white mud produced by papermaking and use of the white mud treated by the method in removal of CO2 in tail flue gas from coal-fired boiler |
| CN102777921A (en) * | 2012-07-12 | 2012-11-14 | 广东电网公司电力科学研究院 | System and method for carrying out mercury removal and sulfur fixation on pulverized coal boiler by using white mud |
| CN205138078U (en) * | 2015-09-11 | 2016-04-06 | 浙江天蓝环保技术股份有限公司 | Energy -saving calcium base desulfurizer and desulfurized gypsum drying system |
Non-Patent Citations (1)
| Title |
|---|
| 白昌先等: "炉内喷钙在循环流化床锅炉的作用", 《科技创新与生产力》 * |
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