CN105349216A - Two-step desulphurization method of coal combustion process - Google Patents
Two-step desulphurization method of coal combustion process Download PDFInfo
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- CN105349216A CN105349216A CN201510728430.XA CN201510728430A CN105349216A CN 105349216 A CN105349216 A CN 105349216A CN 201510728430 A CN201510728430 A CN 201510728430A CN 105349216 A CN105349216 A CN 105349216A
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Abstract
The invention discloses a two-step desulphurization method of a coal combustion process. 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 combusting, wherein the desulfurizer A is prepared through mixing coal slag, calcium oxide, limestone and alumina 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 combustion 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 chloride, iron carbonate, vanadic anhydride and zinc borate 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 process for sweetening of coal combustion process.
Background technology
Sulphur in coal comprises inorganic sulfur, organosulfur and elemental sulfur.Inorganic sulfur mainly exists with disulphide and sulphate form, and the disulphide overwhelming majority is pyrite, and small part is white pyrite, and vitriol is calcium sulfate CaSO mainly
4; Organosulfur 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 complicacy of desulfurization reaction process, and the decomposing again of vitriol 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 magnesium oxide and sulfurous gas in calcium-based desulfurization product can be made easily to carry out, and easily form composite minerals, 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 process for sweetening of coal combustion process.
For achieving the above object, technical scheme of the present invention is:
Two step process for sweetening of coal combustion process, comprise the following steps:
S1, coal dust to be mixed with sweetening agent A, grinds, then cross 100 ~ 150 mesh sieves, after screening desulfurized coal A, desulfurized coal A is sprayed in boiler and burns; Wherein, sweetening agent A is made up by weight ratio of following raw material: cinder 20 ~ 30 parts, 20 ~ 30 parts, calcium oxide, 40 ~ 52 parts, Wingdale, 5 ~ 8 parts, aluminum oxide;
S2, coal dust to be mixed with sweetening 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: sweetening agent B is made up by weight ratio of following raw material: 10 ~ 12 parts, Tai-Ace S 150,10 ~ 12 parts, sodium carbonate, 8 ~ 10 parts, Repone K, iron carbonate 9 ~ 15 parts, Vanadium Pentoxide in FLAKES 3 ~ 5 parts and zinc borate 2 ~ 4 parts, sweetening 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 sweetening agent A are 50 ~ 55:1.
In described step S2, coal dust and the preferred weight ratio of sweetening agent B are 70 ~ 75:1.
Described sweetening agent A is preferably made up by weight ratio of following raw material: cinder 25 parts, 25 parts, calcium oxide, 46 parts, Wingdale, 7 parts, aluminum oxide.
Described sweetening agent B is preferably made up by weight ratio of following raw material: 11 parts, Tai-Ace S 150,11 parts, sodium carbonate, 9 parts, Repone K, iron carbonate 12 parts, Vanadium Pentoxide in FLAKES 4 parts and zinc borate 3 parts.
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 75 ~ 85 DEG C.
Preferably, described is 2.5 ~ 3.5 meters with the stuff-spraying pipe of secondary air channel arranged crosswise and the transverse distance at boiler center, and the angle of stuff-spraying pipe and boiler wall is 60 ~ 75 °.
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 temperature of combustion 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 sweetening agent B dipping of coal dust, sweetening agent B is by Tai-Ace S 150, sodium carbonate, Repone K, iron carbonate, Vanadium Pentoxide in FLAKES and zinc borate 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, potassium, the element such as iron and vanadium add the reaction can accelerating catalysis calcium containing compound and sulfurous gas, the combustion adjuvant contained in sweetening agent B on the other hand also can promote the burning of coal dust, thus while the pyrolytic decomposition suppressing desulfurization product calcium sulfate, ensure the Thorough combustion of coal dust.
(3) the present invention adds sweetening agent by segmentation, has given full play to the effect of calcium-based desulfurizing agent, has substantially increased desulfuration efficiency.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
Two step process for sweetening of coal combustion process, comprise the following steps:
S1, coal dust to be mixed with sweetening agent A, grinds, then cross 100 ~ 150 mesh sieves, after screening desulfurized coal A, desulfurized coal A is sprayed in boiler and burns; Wherein, sweetening agent A is made up by weight ratio of following raw material: cinder 25 parts, 25 parts, calcium oxide, 46 parts, Wingdale and 7 parts, aluminum oxide, and the weight ratio of coal dust and sweetening agent A is 50:1;
S2, coal dust to be mixed with sweetening 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: sweetening agent B is made up by weight ratio of following raw material: 11 parts, Tai-Ace S 150,11 parts, sodium carbonate, 9 parts, Repone K, iron carbonate 12 parts, Vanadium Pentoxide in FLAKES 4 parts and zinc borate 3 parts, sweetening 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 sweetening 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 transverse distance of the stuff-spraying pipe and boiler center that spray into desulfurized coal B is preferably set to 2.5 ~ 3 meters, and the angle of stuff-spraying pipe and boiler wall is 65 °.
Simulate above-mentioned steps in laboratory conditions, desulfurization degree can reach 78.3%.
Embodiment 2
Two step process for sweetening of coal combustion process, comprise the following steps:
S1, coal dust to be mixed with sweetening agent A, grinds, then cross 100 ~ 150 mesh sieves, after screening desulfurized coal A, desulfurized coal A is sprayed in boiler and burns; Wherein, sweetening agent A is made up by weight ratio of following raw material: cinder 20 parts, 30 parts, calcium oxide, 52 parts, Wingdale and 5 parts, aluminum oxide, and the weight ratio of coal dust and sweetening agent A is 53:1;
S2, coal dust to be mixed with sweetening 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: sweetening agent B is made up by weight ratio of following raw material: 10 parts, Tai-Ace S 150,10 parts, sodium carbonate, 8 parts, Repone K, iron carbonate 15 parts, Vanadium Pentoxide in FLAKES 5 parts and zinc borate 4 parts, sweetening 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 sweetening 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 transverse distance 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 70.1%.
Embodiment 3
Two step process for sweetening of coal combustion process, comprise the following steps:
S1, coal dust to be mixed with sweetening agent A, grinds, then cross 100 ~ 150 mesh sieves, after screening desulfurized coal A, desulfurized coal A is sprayed in boiler and burns; Wherein, sweetening agent A is made up by weight ratio of following raw material: cinder 30 parts, 20 parts, calcium oxide, 40 parts, Wingdale and 8 parts, aluminum oxide, and the weight ratio of coal dust and sweetening agent A is 55:1;
S2, coal dust to be mixed with sweetening 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: sweetening agent B is made up by weight ratio of following raw material: 12 parts, Tai-Ace S 150,12 parts, sodium carbonate, 10 parts, Repone K, iron carbonate 9 parts, Vanadium Pentoxide in FLAKES 3 parts and zinc borate 2 parts, sweetening 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 sweetening 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 transverse distance of the stuff-spraying pipe and boiler center that spray into desulfurized coal B is preferably set to 2.5 ~ 3.5 meters, and the angle of stuff-spraying pipe and boiler wall is 60 °.
Simulate above-mentioned steps in laboratory conditions, desulfurization degree can reach 68.1%.
Above content is in conjunction with concrete preferred implementation 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. two step process for sweetening of coal combustion process, is characterized in that comprising the following steps:
S1, coal dust to be mixed with sweetening agent A, grinds, then cross 100 ~ 150 mesh sieves, after screening desulfurized coal A, desulfurized coal A is sprayed in boiler and burns; Wherein, sweetening agent A is made up by weight ratio of following raw material: cinder 20 ~ 30 parts, 20 ~ 30 parts, calcium oxide, 40 ~ 52 parts, Wingdale, 5 ~ 8 parts, aluminum oxide;
S2, coal dust to be mixed with sweetening 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: sweetening agent B is made up by weight ratio of following raw material: 10 ~ 12 parts, Tai-Ace S 150,10 ~ 12 parts, sodium carbonate, 8 ~ 10 parts, Repone K, iron carbonate 9 ~ 15 parts, Vanadium Pentoxide in FLAKES 3 ~ 5 parts and zinc borate 2 ~ 4 parts, sweetening 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. two step process for sweetening of a kind of coal combustion process according to claim 1, is characterized in that:
In described step S1, the weight ratio of coal dust and sweetening agent A is 50 ~ 55:1.
3. two step process for sweetening of a kind of coal combustion process according to claim 1, is characterized in that:
In described step S2, the weight ratio of coal dust and sweetening agent B is 70 ~ 75:1.
4. two step process for sweetening of a kind of coal combustion process according to claim 1, is characterized in that:
Described sweetening agent A is made up by weight ratio of following raw material: cinder 25 parts, 25 parts, calcium oxide, 46 parts, Wingdale, 7 parts, aluminum oxide.
5. two step process for sweetening of a kind of coal combustion process according to claim 1, is characterized in that:
Described sweetening agent B is made up by weight ratio of following raw material: 11 parts, Tai-Ace S 150,11 parts, sodium carbonate, 9 parts, Repone K, iron carbonate 12 parts, Vanadium Pentoxide in FLAKES 4 parts and zinc borate 3 parts.
6. two step process for sweetening of a kind of coal combustion process 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. two step process for sweetening of a kind of coal combustion process according to claim 1, is characterized in that:
Described desulfurized coal B sprays in boiler with the form of eddy flow.
8. two step process for sweetening of a kind of coal combustion process according to claim 1, is characterized in that:
Spray in boiler after described desulfurized coal B is preheated to 75 ~ 85 DEG C.
9. two step process for sweetening of a kind of coal combustion process according to claim 1, is characterized in that:
Described is 2.5 ~ 3.5 meters with the stuff-spraying pipe of secondary air channel arranged crosswise and the transverse distance at boiler center, and the angle of stuff-spraying pipe and boiler wall is 60 ~ 75 °.
10. two step process for sweetening of a kind of coal combustion process 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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| CN201510728430.XA CN105349216A (en) | 2015-10-30 | 2015-10-30 | Two-step desulphurization method of coal combustion process |
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Citations (2)
| 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 |
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Patent Citations (2)
| 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 |
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Application publication date: 20160224 |