CN105344233A - Two-step desulphurization method for coal-fired boiler - Google Patents
Two-step desulphurization method for coal-fired boiler Download PDFInfo
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- 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
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2251/302—Alkali metal compounds of lithium
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- B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B01D2251/608—Sulfates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
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Abstract
The invention discloses a two-step desulphurization method for a coal-fired boiler. The method comprises the following steps: 1, mixing coal dust with a desulfurizer A to obtain desulfurized coal A, injecting the desulfurized coal A to a boiler, and burning, wherein the desulfurizer A is prepared through mixing coal slag, calcium oxide, calcium hydroxide, alumina and zinc oxide in proportion; and 2, mixing the coal dust with a desulfurizer B to prepare desulfurized coal B, and injecting the desulfurized B to the main burning zone of the boiler through a spray tube intersecting with a secondary wind tube, wherein the desulfurizer B is prepared through mixing aluminum sulfate, sodium carbonate, potassium acetate, iron carbonate, ammonium molybdate and magnesium chloride in proportion, the desulfurizer B is added to water and is mixed to prepare a suspension with the mass percentage of 12-20%, the suspension is mixed with the coal dust, and the obtained material is disposed until the water content is 3-5% to obtain the desulfurized coal B. The desulfurizers are added in a segmented manner, so the effects of a calcium base desulfurizer are fully shown, and the desulphurization efficiency is greatly improved.
Description
Technical field
The present invention relates to coal combustion desulfurization, particularly relate to a kind of two step method sulfur method for coal-burning boiler.
Background technology
Sulphur in coal comprises inorganic sulfur, organic sulfur and elemental sulfur.Inorganic sulfur mainly exists with disulphide and sulphate form, and the disulphide overwhelming majority is pyrite, and small part is marcasite, and sulfate is calcium sulfate CaSO mainly
4; Organic sulfur is with mercaptan, sulfide, disulphide and be the form of fragrant epithio of representative and coal-based body Direct Bonding with thiophene.Using calcium-based desulfurizing agent desulfurization in coal combustion process, is the sulfur method that application is more at present.Due to the complexity of desulfurization reaction process, and the decomposing again of sulfate under high temperature, make the effective rate of utilization of burning calcium-based desulfurizing agent and desulfurization efficiency general lower.For improving desulfurization efficiency, add the element compounds such as sodium Na, potassium K, iron Fe and manganese Mn as auxiliary agent, the reaction of magnesia and sulfur dioxide in calcium-based desulfurization product can be made easily to carry out, and easily form complex mineral, improve the high-temperature decomposition temperature of calcium-based desulfurization product calcium sulfate.But calcium-based desulfurizing agent is main sulfur-bearing ore deposit phase with calcium sulfate in reality, and it will decompose coal dust firing operating mode less than 1100 DEG C, cause desulfurization efficiency still many lower than 50%.
Summary of the invention
The defect that the object of the invention is to make up prior art provides a kind of two step method sulfur method for coal-burning boiler.
For achieving the above object, technical scheme of the present invention is:
For a two step method sulfur method for coal-burning boiler, comprise the following steps:
S1, coal dust to be mixed with desulfurizing agent A, grinds, then cross 100 ~ 150 mesh sieves, after screening desulfurized coal A, desulfurized coal A is sprayed in boiler and burns; Wherein, desulfurizing agent A is made up by weight ratio of following raw material: cinder 20 ~ 30 parts, 20 ~ 30 parts, calcium oxide, 40 ~ 52 parts, calcium hydroxide, 5 ~ 8 parts, aluminium oxide, 1 ~ 3 part, zinc oxide;
S2, coal dust to be mixed with desulfurizing agent B, obtain desulfurized coal B, then by spraying into the main combustion zone of boiler with the stuff-spraying pipe of secondary air channel arranged crosswise; Wherein: desulfurizing agent B is made up by weight ratio of following raw material: 10 ~ 12 parts, aluminum sulfate, 10 ~ 12 parts, sodium carbonate, potassium acetate 9 ~ 11 parts, ferric carbonate 9 ~ 15 parts, ammonium molybdate 5 ~ 9 parts and 2 ~ 4 parts, magnesium chloride, desulfurizing agent B is added water and be mixed and made into the suspension that mass percent is 12 ~ 20%, after mixing with coal dust, being placed to water content is 3 ~ 5%, obtains desulfurized coal B.
In described step S1, coal dust and the preferred weight ratio of desulfurizing agent A are 50 ~ 55:1.
In described step S2, coal dust and the preferred weight ratio of desulfurizing agent B are 70 ~ 75:1.
Described desulfurizing agent A is preferably made up by weight ratio of following raw material: cinder 25 parts, 25 parts, calcium oxide, 46 parts, calcium hydroxide, 7 parts, aluminium oxide, 2 parts, zinc oxide.
Described desulfurizing agent B is preferably made up by weight ratio of following raw material: 11 parts, aluminum sulfate, 11 parts, sodium carbonate, potassium acetate 10 parts, ferric carbonate 12 parts, ammonium molybdate 7 parts and 3 parts, magnesium chloride.
Described desulfurized coal A and the preferred weight ratio of desulfurized coal B are 8 ~ 10:1.
Further, described desulfurized coal B sprays in boiler with the form of eddy flow.
Preferably, spray in boiler after described desulfurized coal B is preheated to 70 ~ 80 ° DEG C.
Preferably, described is 3 ~ 4 meters with the stuff-spraying pipe of secondary air channel arranged crosswise and the lateral separation at boiler center, and the angle of stuff-spraying pipe and boiler wall is 70 ~ 80 °.
Preferably, the flame temperature of described boiler main combustion zone controls at 900 DEG C ~ 1100 DEG C.
The beneficial effect that the present invention is compared with prior art had is as follows:
(1) carry out desulfurization by calcium-based desulfurizing agent in the front end of preignition zone and main combustion zone, the front end ignition temperature of preignition zone and main combustion zone is lower, and calcium-based desulfurizing agent can reach good desulfurization object;
(2) by spraying into desulfurized coal B with the stuff-spraying pipe of secondary air channel arranged crosswise, desulfurized coal B is made up through desulfurizing agent B dipping of coal dust, desulfurizing agent B is by aluminum sulfate, sodium carbonate, potassium acetate, ferric carbonate, ammonium molybdate and magnesium chloride composition, desulfurized coal B mixes with Secondary Air and brings in boiler, add the contact probability of coal dust in desulfurized coal B and boiler, thus, the temperature of control boiler main combustion zone that on the one hand can be suitable, and sodium Na, potassium K, the elements such as iron Fe and magnesium Mg add the reaction can accelerating catalysis calcium containing compound and sulfur dioxide, the comburant contained in desulfurizing agent B on the other hand also can promote the burning of coal dust, thus while the pyrolytic suppressing desulfurization product calcium sulfate, ensure the Thorough combustion of coal dust.
(3) the present invention adds desulfurizing agent by segmentation, has given full play to the effect of calcium-based desulfurizing agent, has substantially increased desulfuration efficiency.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
For a two step method sulfur method for coal-burning boiler, comprise the following steps:
S1, coal dust to be mixed with desulfurizing agent A, grinds, then cross 100 ~ 150 mesh sieves, after screening desulfurized coal A, desulfurized coal A is sprayed in boiler and burns; Wherein, desulfurizing agent A is made up by weight ratio of following raw material: cinder 25 parts, 25 parts, calcium oxide, 46 parts, calcium hydroxide, 7 parts, aluminium oxide and 2 parts, zinc oxide, and the weight ratio of coal dust and desulfurizing agent A is 50:1;
S2, coal dust to be mixed with desulfurizing agent B, obtain desulfurized coal B, then by spraying into the main combustion zone of boiler with the stuff-spraying pipe of secondary air channel arranged crosswise; Wherein: desulfurizing agent B is made up by weight ratio of following raw material: 11 parts, aluminum sulfate, 11 parts, sodium carbonate, potassium acetate 10 parts, ferric carbonate 12 parts, ammonium molybdate 7 parts and 3 parts, magnesium chloride, desulfurizing agent B is added water and be mixed and made into the suspension that mass percent is 15%, after mixing with coal dust, the weight ratio of coal dust and desulfurizing agent B (by dry powder) is 70:1, being placed to water content after mixing is 4%, obtains desulfurized coal B.
The desulfurized coal A added in the boiler and the weight ratio of desulfurized coal B are 9:1.
In step s 2, after desulfurized coal B is preheated to 80 DEG C, spray in boiler with the form of eddy flow, the flame temperature of boiler main combustion zone controls at 900 DEG C ~ 1100 DEG C.
The lateral separation of the stuff-spraying pipe and boiler center that spray into desulfurized coal B is preferably set to 3 ~ 3.5 meters, and the angle of stuff-spraying pipe and boiler wall is 75 °.
Simulate above-mentioned steps in laboratory conditions, desulfurization degree can reach 78.8%.
Embodiment 2
For a two step method sulfur method for coal-burning boiler, comprise the following steps:
S1, coal dust to be mixed with desulfurizing agent A, grinds, then cross 100 ~ 150 mesh sieves, after screening desulfurized coal A, desulfurized coal A is sprayed in boiler and burns; Wherein, desulfurizing agent A is made up by weight ratio of following raw material: cinder 20 parts, 30 parts, calcium oxide, 52 parts, calcium hydroxide, 5 parts, aluminium oxide and 1 part, zinc oxide, and the weight ratio of coal dust and desulfurizing agent A is 53:1;
S2, coal dust to be mixed with desulfurizing agent B, obtain desulfurized coal B, then by spraying into the main combustion zone of boiler with the stuff-spraying pipe of secondary air channel arranged crosswise; Wherein: desulfurizing agent B is made up by weight ratio of following raw material: 10 parts, aluminum sulfate, 10 parts, sodium carbonate, potassium acetate 9 parts, ferric carbonate 15 parts, ammonium molybdate 9 parts and 4 parts, magnesium chloride, desulfurizing agent B is added water and be mixed and made into the suspension that mass percent is 12%, after mixing with coal dust, the weight ratio of coal dust and desulfurizing agent B (by dry powder) is 72:1, being placed to water content after mixing is 5%, obtains desulfurized coal B.
The desulfurized coal A added in the boiler and the weight ratio of desulfurized coal B are 8:1.
In step s 2, after desulfurized coal B is preheated to 85 DEG C, spray in boiler with the form of eddy flow, the flame temperature of boiler main combustion zone controls at 900 DEG C ~ 1100 DEG C.
The lateral separation of the stuff-spraying pipe and boiler center that spray into desulfurized coal B is preferably set to 3 ~ 4 meters, and the angle of stuff-spraying pipe and boiler wall is 80 °.
Simulate above-mentioned steps in laboratory conditions, desulfurization degree can reach 71.2%.
Embodiment 3
For a two step method sulfur method for coal-burning boiler, comprise the following steps:
S1, coal dust to be mixed with desulfurizing agent A, grinds, then cross 100 ~ 150 mesh sieves, after screening desulfurized coal A, desulfurized coal A is sprayed in boiler and burns; Wherein, desulfurizing agent A is made up by weight ratio of following raw material: cinder 30 parts, 20 parts, calcium oxide, 40 parts, calcium hydroxide, 8 parts, aluminium oxide and 3 parts, zinc oxide, and the weight ratio of coal dust and desulfurizing agent A is 55:1;
S2, coal dust to be mixed with desulfurizing agent B, obtain desulfurized coal B, then by spraying into the main combustion zone of boiler with the stuff-spraying pipe of secondary air channel arranged crosswise; Wherein: desulfurizing agent B is made up by weight ratio of following raw material: 12 parts, aluminum sulfate, 12 parts, sodium carbonate, potassium acetate 11 parts, ferric carbonate 9 parts, ammonium molybdate 5 parts and 2 parts, magnesium chloride, desulfurizing agent B is added water and be mixed and made into the suspension that mass percent is 20%, after mixing with coal dust, the weight ratio of coal dust and desulfurizing agent B (by dry powder) is 75:1, being placed to water content after mixing is 3%, obtains desulfurized coal B.
The desulfurized coal A added in the boiler and the weight ratio of desulfurized coal B are 8:1.
In step s 2, after desulfurized coal B is preheated to 75 DEG C, spray in boiler with the form of eddy flow, the flame temperature of boiler main combustion zone controls at 900 DEG C ~ 1100 DEG C.
The lateral separation of the stuff-spraying pipe and boiler center that spray into desulfurized coal B is preferably set to 3.5 ~ 4 meters, and the angle of stuff-spraying pipe and boiler wall is 70 °.
Simulate above-mentioned steps in laboratory conditions, desulfurization degree can reach 68.3%.
Above content is in conjunction with concrete preferred embodiment further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention; make some equivalent alternative or obvious modification without departing from the inventive concept of the premise; and performance or purposes identical, all should be considered as belonging to the scope of patent protection that the present invention is determined by submitted to claims.
Claims (10)
1., for a two step method sulfur method for coal-burning boiler, it is characterized in that comprising the following steps:
S1, coal dust to be mixed with desulfurizing agent A, grinds, then cross 100 ~ 150 mesh sieves, after screening desulfurized coal A, desulfurized coal A is sprayed in boiler and burns; Wherein, desulfurizing agent A is made up by weight ratio of following raw material: cinder 20 ~ 30 parts, 20 ~ 30 parts, calcium oxide, 40 ~ 52 parts, calcium hydroxide, 5 ~ 8 parts, aluminium oxide, 1 ~ 3 part, zinc oxide;
S2, coal dust to be mixed with desulfurizing agent B, obtain desulfurized coal B, then by spraying into the main combustion zone of boiler with the stuff-spraying pipe of secondary air channel arranged crosswise; Wherein: desulfurizing agent B is made up by weight ratio of following raw material: 10 ~ 12 parts, aluminum sulfate, 10 ~ 12 parts, sodium carbonate, potassium acetate 9 ~ 11 parts, ferric carbonate 9 ~ 15 parts, ammonium molybdate 5 ~ 9 parts and 2 ~ 4 parts, magnesium chloride, desulfurizing agent B is added water and be mixed and made into the suspension that mass percent is 12 ~ 20%, after mixing with coal dust, being placed to water content is 3 ~ 5%, obtains desulfurized coal B.
2. a kind of two step method sulfur method for coal-burning boiler according to claim 1, is characterized in that:
In described step S1, the weight ratio of coal dust and desulfurizing agent A is 50 ~ 55:1.
3. a kind of two step method sulfur method for coal-burning boiler according to claim 1, is characterized in that:
In described step S2, the weight ratio of coal dust and desulfurizing agent B is 70 ~ 75:1.
4. a kind of two step method sulfur method for coal-burning boiler according to claim 1, is characterized in that:
Described desulfurizing agent A is made up by weight ratio of following raw material: cinder 25 parts, 25 parts, calcium oxide, 46 parts, calcium hydroxide, 7 parts, aluminium oxide, 2 parts, zinc oxide.
5. a kind of two step method sulfur method for coal-burning boiler according to claim 1, is characterized in that:
Described desulfurizing agent B is made up by weight ratio of following raw material: 11 parts, aluminum sulfate, 11 parts, sodium carbonate, potassium acetate 10 parts, ferric carbonate 12 parts, ammonium molybdate 7 parts and 3 parts, magnesium chloride.
6. a kind of two step method sulfur method for coal-burning boiler according to claim 1, is characterized in that:
The weight ratio of described desulfurized coal A and desulfurized coal B is 8 ~ 10:1.
7. a kind of two step method sulfur method for coal-burning boiler according to claim 1, is characterized in that:
Described desulfurized coal B sprays in boiler with the form of eddy flow.
8. a kind of two step method sulfur method for coal-burning boiler according to claim 1, is characterized in that:
Spray in boiler after described desulfurized coal B is preheated to 70 ~ 80 DEG C.
9. a kind of two step method sulfur method for coal-burning boiler according to claim 1, is characterized in that:
Described is 3 ~ 4 meters with the stuff-spraying pipe of secondary air channel arranged crosswise and the lateral separation at boiler center, and the angle of stuff-spraying pipe and boiler wall is 70 ~ 80 °.
10. a kind of two step method sulfur method for coal-burning boiler according to claim 1, is characterized in that:
The flame temperature of described boiler main combustion zone controls at 900 DEG C ~ 1100 DEG C.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1257981A (en) * | 2000-02-02 | 2000-06-28 | 中国科学院工程热物理研究所 | Desulfurizing process for burner system of pre-combustion chamber |
| CN101311628A (en) * | 2008-07-13 | 2008-11-26 | 兖矿国宏化工有限责任公司 | Circulating fluid bed boiler flue calcium injection and desulfurization process |
| CN102041131A (en) * | 2011-01-21 | 2011-05-04 | 洛阳万山高新技术应用工程有限公司 | High-temperature sulfur solidifying agent for desulfurization in coal blending burner |
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- 2015-10-30 CN CN201510728085.XA patent/CN105344233A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1257981A (en) * | 2000-02-02 | 2000-06-28 | 中国科学院工程热物理研究所 | Desulfurizing process for burner system of pre-combustion chamber |
| CN101311628A (en) * | 2008-07-13 | 2008-11-26 | 兖矿国宏化工有限责任公司 | Circulating fluid bed boiler flue calcium injection and desulfurization process |
| CN102041131A (en) * | 2011-01-21 | 2011-05-04 | 洛阳万山高新技术应用工程有限公司 | High-temperature sulfur solidifying agent for desulfurization in coal blending burner |
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