CN106433854A - Coal desulfurization and decoking process - Google Patents
Coal desulfurization and decoking process Download PDFInfo
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- CN106433854A CN106433854A CN201610924512.6A CN201610924512A CN106433854A CN 106433854 A CN106433854 A CN 106433854A CN 201610924512 A CN201610924512 A CN 201610924512A CN 106433854 A CN106433854 A CN 106433854A
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- coal
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- alkali salt
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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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- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention belongs to the technical field of boiler fuel, and particularly relates to a coal desulfurization and decoking process. The process comprises the following steps: preparing a desulfurizer by modifying chlor-alkali salt sludge, and blending with coal before feeding into a boiler combustion chamber, wherein the addition amount of the desulfurizer accounts for 0.8-1.2% of the weight of the coal; and when the combustion temperature in the combustion chamber exceeds 800 DEG C, spraying the desulfurizer into the combustion chamber in a mist form through a boiler furnace spray gun, wherein the addition amount of the desulfurizer accounts for 0.4-0.6% of the weight of the coal. Compared with the prior art, the coal desulfurization and decoking process has the following advantages: the chlor-alkali salt sludge is effectively utilized, and desulfurization is performed twice before combustion and in the combustion process, so that the desulfurization efficiency is greatly improved, thereby ensuring that the coal can be sufficiently combusted at high combustion stability; coke residues in the combustion chamber are loose and easy to fall; and secondary pollution is decreased. Thus, the desulfurization cost of a large power plant can be lowered.
Description
Technical field
The invention belongs to boiler oil technical field is and in particular to a kind of coal desulfurization coke cleaning technique.
Background technology
Problem with rapid industrial development environmental pollution is more and more prominent, and China has to nitrogen oxides, sulfur dioxide etc.
The control of evil gas, management are increasing, and at present, in fluidized bed combustion, coal is entered together with the lime stone pulverized
Enter boiler, be in suspended motion state in burner hearth, its ignition temperature is more much lower than conventional boiler, in this temperature range,
Lime stone has preferable activity, and the sulphur content discharging in combustion process will be diluted by the deficient product of lime stone around,
Relatively low ignition temperature can reduce the generation of nitrogen oxides, but is difficult to reduce generation and the discharge of fuel nitrogen oxides, and
And, increased the foreign substance of lime stone in stove, in-furnace dust slag characteristic and burning behavior can be changed, be slag cooler slagging scorification and fly
Grey phosphorus content increases, and boiler furnace slagging scorification is a major issue of harm boiler of power plant safe operation and unit availability, with
The expansion of unit capacity, problem will be more prominent, therefore how efficient desulfurization coke cleaning becomes a problem being badly in need of research.
Content of the invention
The purpose of the present invention is for existing problem, there is provided a kind of coal desulfurization coke cleaning technique.
The present invention is achieved by the following technical solutions：A kind of coal desulfurization coke cleaning technique, including herein below：Using
Chlor-alkali salt sludge slag modified making desulfurizing agent, is blended with it, addition accounts for coal-fired weight before coal-fired feeding boiler furnace
0.8-1.2%；After Indoor Combustion temperature of burning is more than 800 DEG C, then desulfurizing agent is sprayed into combustion by boiler furnace spray gun with vaporific
Burn indoor, addition accounts for the 0.4-0.6% of coal-fired weight.
As further improvement of these options, the method for modifying of described chlor-alkali salt sludge slag is as follows：Described chlor-alkali salt sludge
Slag mass concentration be 18% salt acid for adjusting pH value be 6.5, deionized water is rinsed to neutrality, then in 360-400 DEG C of bar
Drying under part to moisture is 0.8-1.5%, grinds and makes its granularity be 40-60 μm.
As further improvement of these options, described desulfurizing agent is made up of the raw material of following weight portion：Modified chlor-alkali
Salt body refuse 18-24, white carbon 6-8, tert-butyl hydroperoxide hexane 2-3, cobaltosic oxide 3-5, nano silicon oxide 8-15, nanoscale
Styrene-acrylic emulsion 4-7.
As further improvement of these options, the preparation method of described desulfurizing agent is：By modified chlor-alkali salt sludge slag, in vain
Add, after carbon black, tert-butyl hydroperoxide hexane, cobaltosic oxide and nano silicon oxide mixing, the water being equivalent to its gross weight twice,
Defibrination in ball mill, the defibrination time is 10-12 hour, then adds nanoscale styrene-acrylic emulsion in gained slurries, at a high speed
It is sufficiently mixed under cutter, obtain desulfurizing agent.
As further improvement of these options, the rotating speed of described high-speed shearing machine turns/min for 2600-2800.
The present invention has advantages below compared to existing technology：Effectively utilizes chlor-alkali salt sludge slag in the present invention, before combustion and
In combustion process, sulphur removal twice, considerably increases sulfur removal effectiveness, fire coal can be enable fully to burn, have stronger flameholding
Property, the indoor cinder of burning is loose, easily comes off, reduces secondary pollution, can reduce the desulphurization cost of large power plant.
Specific embodiment
In power-plant flue gas, the content of SO2 is higher at present, 2000 ~ 4000mg/m, and GB13223-2003《Thermal power plant
Atmosphere pollutants emission standardses》In, the permission concentration of emission of SO2 is required to be less than 800mg/m, select in the present invention local certain
Power plant is detected, the discharge capacity recording SO2 in this power-plant flue gas reaches 3600mg/m, method pair in the present invention used below
This power plant carries out desulfurization.
Embodiment 1
A kind of coal desulfurization coke cleaning technique, including herein below：Using chlor-alkali salt sludge slag modified making desulfurizing agent, send in fire coal
Blend with it before entering boiler furnace, addition accounts for the 0.8% of coal-fired weight；After Indoor Combustion temperature of burning is more than 800 DEG C,
Again desulfurizing agent is passed through boiler furnace spray gun and spray into burning interior with vaporific, addition accounts for the 0.5% of coal-fired weight.
Wherein, the method for modifying of described chlor-alkali salt sludge slag is as follows：Described chlor-alkali salt sludge slag mass concentration is 18% hydrochloric acid
Adjusting pH value is 6.5, and deionized water is rinsed to neutrality, and then drying under conditions of 360 DEG C to moisture is 1.2%, grinds
Mill makes its granularity be 60 μm.
Wherein, described desulfurizing agent is made up of the raw material of following weight portion：Modified chlor-alkali salt sludge slag 18, white carbon 8, the tert-butyl group
Butylperoxyhexane 3, cobaltosic oxide 4, nano silicon oxide 10, nanoscale styrene-acrylic emulsion 7.
Wherein, the preparation method of described desulfurizing agent is：By modified chlor-alkali salt sludge slag, white carbon, tert-butyl hydroperoxide hexane,
Add, after cobaltosic oxide and nano silicon oxide mixing, the water being equivalent to its gross weight twice, defibrination in ball mill, during defibrination
Between be 12 hours, then in gained slurries add nanoscale styrene-acrylic emulsion, be sufficiently mixed under high-speed shearing machine, obtain desulfurization
Agent.
Wherein, the rotating speed of described high-speed shearing machine is 2800 turns/min.
After desulfurization coke cleaning, the discharge capacity of sulfur dioxide in flue gas is about 420mg/m, and boiler thermal output improves
1.92%, cinder is loose after combustion, easily comes off, easy to clean.
Embodiment 2
A kind of coal desulfurization coke cleaning technique, including herein below：Using chlor-alkali salt sludge slag modified making desulfurizing agent, send in fire coal
Blend with it before entering boiler furnace, addition accounts for the 1% of coal-fired weight；After Indoor Combustion temperature of burning is more than 800 DEG C, then
Desulfurizing agent is passed through boiler furnace spray gun and sprays into burning interior with vaporific, addition accounts for the 0.6% of coal-fired weight.
Wherein, the method for modifying of described chlor-alkali salt sludge slag is as follows：Described chlor-alkali salt sludge slag mass concentration is 18% hydrochloric acid
Adjusting pH value is 6.5, and deionized water is rinsed to neutrality, and then drying under conditions of 400 DEG C to moisture is 1.2%, grinds
Mill makes its granularity be 40 μm.
Wherein, described desulfurizing agent is made up of the raw material of following weight portion：Modified chlor-alkali salt sludge slag 22, white carbon 8, the tert-butyl group
Butylperoxyhexane 2, cobaltosic oxide 3, nano silicon oxide 12, nanoscale styrene-acrylic emulsion 5.
The preparation method of described desulfurizing agent is in the same manner as in Example 1.
After desulfurization coke cleaning, the discharge capacity of sulfur dioxide in flue gas is about 470mg/m, and boiler thermal output improves
1.86%, cinder is loose after combustion, easily comes off, easy to clean.
Embodiment 3
A kind of coal desulfurization coke cleaning technique, including herein below：Using chlor-alkali salt sludge slag modified making desulfurizing agent, send in fire coal
Blend with it before entering boiler furnace, addition accounts for the 1.2% of coal-fired weight；After Indoor Combustion temperature of burning is more than 800 DEG C,
Again desulfurizing agent is passed through boiler furnace spray gun and spray into burning interior with vaporific, addition accounts for the 0.4% of coal-fired weight.
Wherein, the method for modifying of described chlor-alkali salt sludge slag is as follows：Described chlor-alkali salt sludge slag mass concentration is 18% hydrochloric acid
Adjusting pH value is 6.5, and deionized water is rinsed to neutrality, and then drying under conditions of 380 DEG C to moisture is 1.5%, grinds
Mill makes its granularity be 50 μm.
Wherein, described desulfurizing agent is made up of the raw material of following weight portion：Modified chlor-alkali salt sludge slag 24, white carbon 6, the tert-butyl group
Butylperoxyhexane 2, cobaltosic oxide 3, nano silicon oxide 14, nanoscale styrene-acrylic emulsion 4.
The preparation method of described desulfurizing agent is in the same manner as in Example 1.
After desulfurization coke cleaning, the discharge capacity of sulfur dioxide in flue gas is about 440mg/m, and boiler thermal output improves
1.78%, cinder is loose after combustion, easily comes off, easy to clean.
Claims (5)
1. a kind of coal desulfurization coke cleaning technique is it is characterised in that include herein below：Taken off using modified making of chlor-alkali salt sludge slag
Sulphur agent, is blended with it, addition accounts for the 0.8-1.2% of coal-fired weight before coal-fired feeding boiler furnace；When burning Indoor Combustion
After temperature is more than 800 DEG C, then desulfurizing agent is sprayed into burning interior by boiler furnace spray gun with vaporific, addition accounts for coal-fired weight
0.4-0.6%.
2. as claimed in claim 1 a kind of coal desulfurization coke cleaning technique it is characterised in that the method for modifying of described chlor-alkali salt sludge slag
As follows：Described chlor-alkali salt sludge slag mass concentration be 18% salt acid for adjusting pH value be 6.5, deionized water is rinsed to neutrality, so
Drying under conditions of 360-400 DEG C afterwards to moisture is 0.8-1.5%, grinds and makes its granularity be 40-60 μm.
3. as claimed in claim 2 a kind of coal desulfurization coke cleaning technique it is characterised in that described desulfurizing agent is by following weight portion
Raw material is made：Modified chlor-alkali salt sludge slag 18-24, white carbon 6-8, tert-butyl hydroperoxide hexane 2-3, cobaltosic oxide 3-5, nanometer
Silica 8-15, nanoscale styrene-acrylic emulsion 4-7.
4. as claimed in claim 3 a kind of coal desulfurization coke cleaning technique it is characterised in that the preparation method of described desulfurizing agent is：
Add quite after modified chlor-alkali salt sludge slag, white carbon, tert-butyl hydroperoxide hexane, cobaltosic oxide and nano silicon oxide are mixed
In the water of its gross weight twice, defibrination in ball mill, the defibrination time is 10-12 hour, then adds in gained slurries and receives
Meter level styrene-acrylic emulsion, is sufficiently mixed under high-speed shearing machine, obtains desulfurizing agent.
5. as claimed in claim 4 a kind of coal desulfurization coke cleaning technique it is characterised in that the rotating speed of described high-speed shearing machine is
2600-2800 turns/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610924512.6A CN106433854A (en) | 2016-10-24 | 2016-10-24 | Coal desulfurization and decoking process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610924512.6A CN106433854A (en) | 2016-10-24 | 2016-10-24 | Coal desulfurization and decoking process |
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| CN106433854A true CN106433854A (en) | 2017-02-22 |
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| CN201610924512.6A Pending CN106433854A (en) | 2016-10-24 | 2016-10-24 | Coal desulfurization and decoking process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108641777A (en) * | 2018-04-04 | 2018-10-12 | 江苏大学 | A kind of method that well salt production by-product nanometer salt slurry compound is used for fired coal combustion desulfurization |
Citations (5)
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|---|---|---|---|---|
| CN1699526A (en) * | 2005-06-13 | 2005-11-23 | 华中科技大学 | Coal combustion and sulfur fixation composite additives |
| CN101274206A (en) * | 2007-12-25 | 2008-10-01 | 江苏省井神盐业有限公司 | Method for producing sulfur absorbing agent by 'salty mud' |
| JP2013203760A (en) * | 2012-03-27 | 2013-10-07 | Babcock Hitachi Kk | Dehydration system of low-grade coal and power plant using the same |
| CN105567365A (en) * | 2014-10-09 | 2016-05-11 | 无锡荣博能源环保科技有限公司 | Modified coal and manufacturing method thereof |
| WO2015126169A3 (en) * | 2014-02-20 | 2017-05-18 | 디에스티주식회사 | Combustion additive composition of solid fuel and method for using same |
-
2016
- 2016-10-24 CN CN201610924512.6A patent/CN106433854A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1699526A (en) * | 2005-06-13 | 2005-11-23 | 华中科技大学 | Coal combustion and sulfur fixation composite additives |
| CN101274206A (en) * | 2007-12-25 | 2008-10-01 | 江苏省井神盐业有限公司 | Method for producing sulfur absorbing agent by 'salty mud' |
| JP2013203760A (en) * | 2012-03-27 | 2013-10-07 | Babcock Hitachi Kk | Dehydration system of low-grade coal and power plant using the same |
| WO2015126169A3 (en) * | 2014-02-20 | 2017-05-18 | 디에스티주식회사 | Combustion additive composition of solid fuel and method for using same |
| CN105567365A (en) * | 2014-10-09 | 2016-05-11 | 无锡荣博能源环保科技有限公司 | Modified coal and manufacturing method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108641777A (en) * | 2018-04-04 | 2018-10-12 | 江苏大学 | A kind of method that well salt production by-product nanometer salt slurry compound is used for fired coal combustion desulfurization |
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Application publication date: 20170222 |