CN105276576B - A kind of coal desulfurization technique - Google Patents
A kind of coal desulfurization technique Download PDFInfo
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- CN105276576B CN105276576B CN201510678725.0A CN201510678725A CN105276576B CN 105276576 B CN105276576 B CN 105276576B CN 201510678725 A CN201510678725 A CN 201510678725A CN 105276576 B CN105276576 B CN 105276576B
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Abstract
The invention discloses a kind of coal desulfurization technique, comprise the following steps, fire coal is crushed to particle diameter≤30mm, be delivered to burning in circulating fluid bed boiler room；The sulphur-fixing agent for accounting for coal-fired total amount 2%~10% is delivered to burning in circulating fluid bed boiler room；The temperature for controlling combustion chamber is 850 DEG C~950 DEG C, after described coal-fired and described sulphur-fixing agent burns in CFBB, flue gas is separated by cyclone separator, and solid ion, which is separated, is back to combustion chamber, and flue gas is discharged into air after air preheater and electric cleaner；CFB residues are discharged from the slag-drip opening of bottom of combustion chamber.The sulfur removal technology is simple to operate, and cost is low, boiler coal consumption is averagely reduced by more than 5%, makes sulphur emissions≤30mg/m3, sulfur-fixing rate >=97% realizes zero-emission substantially.
Description
Technical field
The invention belongs to Coal Clean application field, a kind of coal desulfurization technique of specific design.
Background technology
Coal is the topmost energy of China, and the sulfur content of China's coal is general 0.38%~5.32%, average out to 1.72%, and
And sulphur coal accounts for the 33.33% of coal reserves, the 16.67% of production raw coal is accounted for, and with the increase of seam mining depth, I
The sulfur content of state's main mining area coal has increased trend.And coal as primary energy when directly burning, the wherein sulphur in coal
There is 90% to be converted into SO2Air is discharged into, very big pressure is caused to environment, at present coal-fired SO2Sulfur removal technology mainly has wet method to take off
Sulphur technique and dry desulfurizing process, wet processing are most commonly used that Limestone-gypsum Wet Flue Gas Desulfurization Process technique, and this method is by from electricity
The flue gas that deduster comes out is pumped into absorption tower by supercharging, and in absorption tower, the lime stone thin pulp of circulation is washed to flue gas
Wash, realize SO2With calcium carbonate reaction, desulfurized effect is reached；But the output investment ratio of this method equipment is larger, needed for during use
The water consume wanted, power consumption are higher, and the maintenance cost of equipment is higher.And dry process is then using spray lime stone afterbody humidification in stove
Sulfur removal technology, the desulfurization degree reachable 80%~90% of this method, but the desulfurizing byproduct of this method is deposited with unstable state
Calcium sulfite based on Desulphurization, the comprehensive utilization of accessory substance is affected.
The content of the invention
In order to solve the above technical problems, the invention provides a kind of coal desulfurization technique, this method operates simpler, effect
More preferably.
The present invention uses following technical scheme：
The present invention provides a kind of coal desulfurization technique and comprised the following steps, and fire coal is crushed into particle diameter≤30mm, is delivered to
Burning in circulating fluid bed boiler room；The sulphur-fixing agent for accounting for coal-fired total amount 2%~10% is delivered to burning in circulating fluid bed boiler room；Institute
State after coal-fired and described sulphur-fixing agent burns in CFBB, flue gas is separated by cyclone separator, solid grain
Son, which is separated, is back to combustion chamber, and flue gas is discharged into air after air preheater and electric cleaner device；CFB residues from
The slag-drip opening discharge of bottom of combustion chamber.
It is preferred that, the temperature of the combustion chamber is 850 DEG C~950 DEG C.
It is preferred that, the sulphur-fixing agent is made up of the raw material of following parts by weight：50~75 parts of calcium oxide, cadmia 10~26
Part, 2~5 parts of copper ashes, 4~8 parts of activator, 1~5 part of stabilizer and 1~3 part of exciting agent.
It is preferred that, the preparation method of the sulphur-fixing agent is as follows：By calcium oxide, cadmia, copper ashes, activator, stabilizer and swash
Send out agent add ball mill mixing, ball milling into 0.1~5 mm powder, stand 6~10 h, produce the sulphur-fixing agent.
It is preferred that, the wt% of CaO in described cadmia >=10.
It is preferred that, Fe in described copper ashes2O3≥20wt%。
It is preferred that, described activator is gypsum and/or calcirm-fluoride.
It is preferred that, described stabilizer is SiO2And/or Al2O3。
It is preferred that, described exciting agent is calcium sulphoaluminate.
The beneficial effects of the invention are as follows：
（1）The coal desulfurization technological operation is simple, and use cost is low.This method only needs to that sulphur-fixing agent directly is passed through into feed
Mouth is conveyed into CFBB, can be by SO in the combustion process of boiler2Remove, it is not necessary to increase again in the dedusting stage
Plus SO2Dust arrester, simple to operate, the cost of equipment is low, and cost of equipment maintenance is low.
（2）Reduce boiler coal consumption.The SO produced in coal-fired combustion process2Reaction with CaO belongs to exothermic reaction, carries
Heat exchanger effectiveness in the high stove based on radiant heat transfer, under the constant square one of coal-supplying amount, the steaming in fluidized-bed combustion boiler
Hair amount substantially increases, the partial heat also fed to fluidized-bed combustion boiler.Therefore, in fluidized-bed combustion boiler after addition sulphur-fixing agent, pot
Integrated heat efficiency in stove is improved, the average coal consumption reduction by 5% or so of boiler.
（3）High-efficiency desulfurization.Sulphur-fixing agent and fire coal enter after fluidized-bed combustion boiler, during coal-fired fluidized bed combustion, Gu sulphur
The SO of CaO rapidly with being produced in coal combustion process in agent2React, ultimately generate stable CaO3 Al2O3·CaSO4
Clinker.In addition, this reaction is exothermic reaction, can be with overheavy firing, so that further reduction carbon residue and CO discharge capacity, the fire coal
SO after sulfur-fixing rate >=97% of sulfur removal technology, desulfurization2The mg/m of discharge capacity≤303, zero-emission is realized substantially.
Main Gu Liukuang in fluidized-bed combustion boiler conversely should be：
。
Brief description of the drawings
Fig. 1 is the installation drawing of CFBB of the present invention.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
As shown in figure 1, the CFBB includes sulphur-fixing agent material inlet 1, coal-fired material inlet 3, pulverizer 2, burning
Room 4, cyclone separator 6, air preheater 7, electric cleaner device 8, primary air nozzle 9, overfiren air port 10 and slag-drip opening 5.Adopt
During with the circulating fluid bed boiler desulfurization, fire coal is delivered in pulverizer 2 by coal-fired material inlet 3 first be crushed to particle diameter≤
After 30mm, then it is delivered to by machine for zipper in burning in circulating fluid bed boiler room；Sulphur-fixing agent is loaded into sulphur-fixing agent feed simultaneously
It is delivered in mouth 1 by machine for zipper in burning in circulating fluid bed boiler room；The temperature for controlling combustion chamber is 850 DEG C~950 DEG C,
First air enters combustion chamber from primary air nozzle 9, and Secondary Air enters combustion chamber from overfiren air port 10, and the ratio for controlling First air is
55%~60%, after coal-fired and sulphur-fixing agent burns in combustion chamber 4, flue gas is separated by cyclone separator 6, solid ion quilt
Separate and be back to combustion chamber 4, flue gas is discharged into air after air preheater 7 and electric cleaner device 8；CFB residues are from combustion
The slag-drip opening 5 for burning the bottom of room 4 is discharged.
Embodiment 1
A kind of coal desulfurization technique, comprises the following steps, and fire coal is delivered into powder in pulverizer 2 by coal-fired material inlet 3
It is broken to after particle diameter≤30mm, is then delivered to by machine for zipper in burning in circulating fluid bed boiler room；Coal-fired total amount will be accounted for simultaneously
10% sulphur-fixing agent is fitted into sulphur-fixing agent material inlet 1 to be delivered in burning in circulating fluid bed boiler room by machine for zipper；Control burning
The temperature of room is 850 DEG C~950 DEG C, and after coal-fired and sulphur-fixing agent burns in combustion chamber 4, flue gas is divided by cyclone separator 6
From solid ion, which is separated, is back to combustion chamber, and flue gas is discharged into greatly after air preheater 7 and electric cleaner device 8
Gas；CFB residues are discharged from the slag-drip opening 5 of the bottom of combustion chamber 4.
The preparation method of the sulphur-fixing agent used in coal desulfurization technique comprises the following steps：By the raw material of following parts by weight
50 parts of calcium oxide, 10 parts of cadmia, 2 parts of copper ashes, 4 parts of activator calcirm-fluoride, stabilizer Al2O3 1 part, 1 part of exciting agent calcium sulphoaluminate
Add ball mill mixing, ball milling into 0.1~5 mm（＜ 1mm account for 20%, and 1~1.5 mm 70%, the mm of ＞ 1.5 account for 10%）Powder
End, stands 10 h, produces sulphur-fixing agent.
Wherein prepare CaO 15 wt%, SiO in the raw material cadmia of sulphur-fixing agent2 20wt%、FeO 5wt%、Fe2O320wt% and
ZnO 5 wt%；Fe in copper ashes2O320wt%, SiO230wt%, CaO 5wt% and Al2O3 2wt%。
Embodiment 2
A kind of coal desulfurization technique, comprises the following steps, and fire coal is delivered in pulverizer 2 by coal-fired material inlet 3 and crushed
To particle diameter≤30mm, it is delivered to by machine for zipper in burning in circulating fluid bed boiler room；Consolidating for coal-fired total amount 7% will be accounted for simultaneously
Sulphur agent is fitted into sulphur-fixing agent material inlet 1 to be delivered in burning in circulating fluid bed boiler room by machine for zipper；Control the temperature of combustion chamber
Spend for 850 DEG C~950 DEG C, after coal-fired and sulphur-fixing agent burns in combustion chamber 4, flue gas is separated by cyclone separator 6, Gu
Body ion, which is separated, is back to combustion chamber, and flue gas is discharged into air after air preheater 7 and electric cleaner device 8；Gu
Sulphur slag is discharged from the slag-drip opening 5 of the bottom of combustion chamber 4.
The preparation of the sulphur-fixing agent used in coal desulfurization technique comprises the following steps：The raw material of following parts by weight is aoxidized
55 parts of calcium, 12 parts of cadmia, 2.2 parts of copper ashes, 5 parts of activator calcirm-fluoride, stabilizer SiO2 2 parts, 1.1 parts of exciting agent calcium sulphoaluminate adds
Enter ball mill mixing, ball milling into 0.1~5 mm（＜ 1mm account for 15%, and 1~1.5 mm 80%, the mm of ＞ 1.5 account for 5%）Powder,
10 h are stood, product sulphur-fixing agent is produced.
Wherein prepare CaO 11 wt%, SiO in the raw material cadmia of sulphur-fixing agent2 23 wt%、FeO 5 wt %、Fe2O3
18wt% and ZnO 2wt%；Fe in copper ashes2O327wt%, SiO235wt%, CaO 6wt% and Al2O3 3wt%。
Embodiment 3
A kind of coal desulfurization technique, comprises the following steps, and fire coal is delivered in pulverizer 2 by coal-fired material inlet 3 and crushed
To particle diameter≤10mm, it is delivered to by machine for zipper in burning in circulating fluid bed boiler room；Consolidating for coal-fired total amount 8% will be accounted for simultaneously
Sulphur agent is fitted into sulphur-fixing agent material inlet 1 to be delivered in burning in circulating fluid bed boiler room by machine for zipper；Control the temperature of combustion chamber
Spend for 850 DEG C~950 DEG C, after coal-fired and sulphur-fixing agent burns in combustion chamber 4, flue gas is separated by cyclone separator 6, Gu
Body ion, which is separated, is back to combustion chamber, and flue gas is discharged into air after air preheater 7 and electric cleaner device 8；Gu
Sulphur slag is discharged from the slag-drip opening 5 of the bottom of combustion chamber 4.
The preparation of the sulphur-fixing agent used in coal desulfurization technique comprises the following steps：By the calcium oxide 61 of following parts by weight
Part, 15 parts of cadmia, 2.6 parts of copper ashes, 5.2 parts of activator calcirm-fluoride, stabilizer SiO21.2 parts and Al2O31.2 parts and exciting agent
The mixing of 1.5 parts of addition ball mills of calcium sulphoaluminate, ball milling into 0.1~5 mm（＜ 1mm account for 10%, 1~1.5 mm 80%, ＞ 1.5
Mm accounts for 10%）Powder, stand 8 h, that is, prepare sulphur-fixing agent.
Wherein prepare cadmia CaO 12 wt%, SiO in the raw material of sulphur-fixing agent2 21 wt%、FeO 6wt%、Fe2O3 21wt%
With CuO 3wt%；Fe in copper ashes2O330wt%, SiO238wt%, CaO 7wt% and Al2O3 2wt%。
Embodiment 4
A kind of coal desulfurization technique, comprises the following steps, and fire coal is delivered in pulverizer 2 by coal-fired material inlet 3 and crushed
To particle diameter≤10mm, it is delivered to by machine for zipper in burning in circulating fluid bed boiler room；Consolidating for coal-fired total amount 5% will be accounted for simultaneously
Sulphur agent is fitted into sulphur-fixing agent material inlet 1 to be delivered in burning in circulating fluid bed boiler room by machine for zipper；Control the temperature of combustion chamber
Spend for 850 DEG C~950 DEG C, after coal-fired and sulphur-fixing agent burns in combustion chamber 4, flue gas is separated by cyclone separator 6, Gu
Body ion, which is separated, is back to combustion chamber, and flue gas is discharged into air after air preheater 7 and electric cleaner device 8；Gu
Sulphur slag is discharged from the slag-drip opening 5 of the bottom of combustion chamber 4.
The preparation of the sulphur-fixing agent used in coal desulfurization technique comprises the following steps：By the calcium oxide 65 of following parts by weight
Part, 20 parts of cadmia, 3.3 parts of copper ashes, 4 parts of activator calcirm-fluoride and 2 parts of gypsum, stabilizer Al2O3 3 parts and exciting agent sulphur aluminic acid
The mixing of 2 parts of addition ball mills of calcium, ball milling into 0.1~5 mm（＜ 1mm account for 22%, and 1~1.5 mm 71%, the mm of ＞ 1.5 account for 7%）
Powder, stand 6 h, that is, prepare sulphur-fixing agent.
Wherein prepare in the raw material of sulphur-fixing agent CaO 13 wt%, SiO in cadmia2 20 wt%、FeO 6wt%、Fe2O3
21wt% and ZnO 4wt%；Fe in copper ashes2O325wt%, SiO240wt%, CaO 5wt% and Al2O3 2wt%。
Embodiment 5
A kind of coal desulfurization technique, comprises the following steps, and fire coal is delivered in pulverizer 2 by coal-fired material inlet 3 and crushed
To particle diameter≤10mm, it is delivered to by machine for zipper in burning in circulating fluid bed boiler room；Consolidating for coal-fired total amount 6% will be accounted for simultaneously
Sulphur agent is fitted into sulphur-fixing agent material inlet 1 to be delivered in burning in circulating fluid bed boiler room by machine for zipper；Control the temperature of combustion chamber
Spend for 850 DEG C~950 DEG C, after coal-fired and sulphur-fixing agent burns in combustion chamber 4, flue gas is separated by cyclone separator 6, Gu
Body ion, which is separated, is back to combustion chamber, and flue gas is discharged into air after air preheater 7 and electric cleaner device 8；Gu
Sulphur slag is discharged from the slag-drip opening 5 of the bottom of combustion chamber 4.
The preparation of the sulphur-fixing agent used in coal desulfurization technique comprises the following steps：By the calcium oxide 72 of following parts by weight
Part, 22 parts of cadmia, 4.3 parts of copper ashes, 3 parts of activator gypsum and 4 parts of calcirm-fluoride, stabilizer Al2O3 4 parts and exciting agent sulphur aluminic acid
The mixing of 2.3 parts of addition ball mills of calcium, ball milling into 0.1~5 mm（＜ 1mm account for 17%, and 1~1.5 mm 79%, the mm of ＞ 1.5 are accounted for
4%）Powder, stand 6 h, that is, prepare sulphur-fixing agent.
Wherein prepare in the raw material of sulphur-fixing agent CaO 10 wt%, SiO in cadmia2 21 wt%、FeO 5wt%、Fe2O3
15wt% and ZnO 2wt%；Fe in copper ashes2O320wt%, SiO230wt%, CaO 6wt% and Al2O3 3wt%。
Embodiment 6
A kind of coal desulfurization technique, comprises the following steps, and fire coal is delivered in pulverizer 2 by coal-fired material inlet 3 and crushed
To particle diameter≤10mm, it is delivered to by machine for zipper in burning in circulating fluid bed boiler room；Consolidating for coal-fired total amount 2% will be accounted for simultaneously
Sulphur agent is fitted into sulphur-fixing agent material inlet 1 to be delivered in burning in circulating fluid bed boiler room by machine for zipper；Control the temperature of combustion chamber
Spend for 850 DEG C~950 DEG C, after coal-fired and sulphur-fixing agent burns in combustion chamber 4, flue gas is separated by cyclone separator 6, Gu
Body ion, which is separated, is back to combustion chamber, and flue gas is discharged into air after air preheater 7 and electric cleaner device 8；Gu
Sulphur slag is discharged from the slag-drip opening 5 of the bottom of combustion chamber 4.
The preparation of the sulphur-fixing agent used in coal desulfurization technique comprises the following steps：By following parts by weight calcium oxide 75
Part, 26 parts of cadmia, 5 parts of copper ashes, 4 parts of activator gypsum and 4 parts of calcirm-fluoride, stabilizer SiO2 5 parts and exciting agent calcium sulphoaluminate 3
The mixing of part addition ball mill, ball milling into 0.1~5 mm（＜ 1mm account for 15%, and 1~1.5 mm 75%, the mm of ＞ 1.5 account for 10%）'s
Powder, stands 9 h, that is, prepares sulphur-fixing agent.
Wherein prepare in the raw material of sulphur-fixing agent CaO 15 wt%, SiO in cadmia2 20 wt%、FeO 6wt%、Fe2O3
18wt% and ZnO 2wt%；Fe in copper ashes2O330wt%, SiO240wt%, CaO 10wt% and Al2O3 2wt%。
Performance detection is tested
By taking Zhengzhou City power plant as an example, embodiment 1~6 is the coal desulfurization technique of embodiments of the invention 1~6, right
Sulfur removal technology in ratio is using calcium carbonate as sulphur-fixing agent, and the ratio of sulphur-fixing agent and raw coal according to the form below is delivered to 850~950
In DEG C CFBB, test result is shown in Tables 1 and 2.
The sulfur removal technology reduction boiler coal consumption test result of the embodiment of the present invention 1~6 of table 1
The sulfur removal technology desulfurization result of 2 embodiment of the present invention of table 1~6
As can be seen from Table 1, when carrying out solid sulphur using the sulphur-fixing agent of embodiment in the present invention 1~6, coal consumption 5% can be reduced
More than, and due to using CaCO in comparative example3When carrying out solid sulphur as sulphur-fixing agent, the energy consumption in the solid sulphur technique increases on the contrary
, this is due to use CaCO3Gu during sulphur, CaCO3Decomposition can absorb heat, so as to cause energy consumption to increase.Use as can be seen from Table 2
When the solid sulphur technique of the embodiment of the present invention 1~6 carries out desulfurization, SO after desulfurization2The mg/m of discharge capacity≤303, zero-emission is realized substantially.
Claims (7)
1. a kind of coal desulfurization technique, it is characterised in that the device that the technique is used includes sulphur-fixing agent material inlet, fire coal feed
Mouth, pulverizer, combustion chamber, cyclone separator, air preheater, electric cleaner device, primary air nozzle, overfiren air port and deslagging
Mouthful；The technique comprises the following steps：Fire coal is delivered in pulverizer by coal-fired material inlet to be crushed to after particle diameter≤30mm, so
After be delivered in burning in circulating fluid bed boiler room；The sulphur-fixing agent for accounting for coal-fired total amount 2%~10% is loaded into sulphur-fixing agent material inlet defeated
Deliver in burning in circulating fluid bed boiler room；After coal-fired and sulphur-fixing agent burns in a combustion chamber, flue gas enters by cyclone separator
Row separation, solid ion, which is separated, is back to combustion chamber, and flue gas is discharged into after air preheater and electric cleaner device
Air；CFB residues are discharged from the slag-drip opening of bottom of combustion chamber；
The sulphur-fixing agent is made up of the raw material of following parts by weight：50~75 parts of calcium oxide, 10~26 parts of cadmia, copper ashes 2~5
Part, 4~8 parts of activator, 1~5 part of stabilizer and 1~3 part of exciting agent；
Described exciting agent is calcium sulphoaluminate.
2. coal desulfurization technique according to claim 1, it is characterised in that the temperature of the combustion chamber is 850 DEG C~950
℃。
3. coal desulfurization technique according to claim 1, it is characterised in that the preparation method of the sulphur-fixing agent is as follows：Will
Calcium oxide, cadmia, copper ashes, activator, stabilizer and exciting agent add ball mill mixing, ball milling into 0.1~5 mm powder,
6~10 h are stood, the sulphur-fixing agent is produced.
4. coal desulfurization technique according to claim 3, it is characterised in that the wt% of CaO in described cadmia >=10.
5. coal desulfurization technique according to claim 3, it is characterised in that Fe in described copper ashes2O3≥20 wt %。
6. coal desulfurization technique according to claim 3, it is characterised in that described activator is gypsum and/or fluorination
Calcium.
7. coal desulfurization technique according to claim 3, it is characterised in that described stabilizer is SiO2And/or Al2O3。
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| CN106147922A (en) * | 2016-08-03 | 2016-11-23 | 安徽中缘新材料科技有限公司 | A kind of clean coal additive |
| CN106190424A (en) * | 2016-08-03 | 2016-12-07 | 安徽中缘新材料科技有限公司 | A kind of preparation method of clean coal additive |
| CN106190392A (en) * | 2016-08-03 | 2016-12-07 | 安徽中缘新材料科技有限公司 | The preparation method of Filter Tuber For Clean Coal |
| CN108571723A (en) * | 2018-05-02 | 2018-09-25 | 河南禾力能源股份有限公司 | A kind of dry slag of boiler dusting separation enters furnace structure |
| CN108854521A (en) * | 2018-06-29 | 2018-11-23 | 浙江钙科机械设备有限公司 | A kind of high-efficiency activated desulfurizing agent |
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