CN105733727A - Attapulgite composite additive for reducing ignition temperature of civilian coke, preparation method and application - Google Patents

Attapulgite composite additive for reducing ignition temperature of civilian coke, preparation method and application Download PDF

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Publication number
CN105733727A
CN105733727A CN201610103027.2A CN201610103027A CN105733727A CN 105733727 A CN105733727 A CN 105733727A CN 201610103027 A CN201610103027 A CN 201610103027A CN 105733727 A CN105733727 A CN 105733727A
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additive
attapulgite clay
coal
attapulgite
clay compounded
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CN105733727B (en
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杜文广
刘守军
张智聪
杨颂
上官炬
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Taiyuan Green Coke Energy Co Ltd
Taiyuan University of Technology
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Taiyuan Green Coke Energy Co Ltd
Taiyuan University of Technology
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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
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
    • C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives
    • 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
    • C10L10/00—Use of additives to fuels or fires for particular purposes
    • C10L10/02—Use of additives to fuels or fires for particular purposes for reducing smoke development
    • 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
    • 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
    • C10L2230/00—Function and purpose of a components of a fuel or the composition as a whole
    • C10L2230/04—Catalyst added to fuel stream to improve a reaction
    • 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
    • C10L2230/00—Function and purpose of a components of a fuel or the composition as a whole
    • C10L2230/22—Function and purpose of a components of a fuel or the composition as a whole for improving fuel economy or fuel efficiency

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Materials Engineering (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

The invention provides an attapulgite composite additive for reducing the ignition temperature of civilian coke. The composite additive is prepared from, by weight, 30-60 parts of attapulgite and 40-70 parts of limestone. The source of the raw materials is wide and rich, the price is low, the cooling effect on the ignition temperature is remarkable, emissions of sulfur oxide and nitrogen oxide are reduced by 70% or above, emissions of smoke are reduced by 96% or above, and great practical significance is achieved for solving the life coal problem in rural areas around cities, improving rural and urban environment quality and reducing haze weather.

Description

Reduce the attapulgite clay compounded additive of domestic coke ignition temperature and method for making and application
Technical field
The present invention relates to a kind of attapulgite clay compounded additive reducing domestic coke ignition temperature and preparation method and application.
Background technology
Coal burning is that the long duration obtains the major way of the energy at present or even from now in China, the dust of direct burning and exhausting of a large amount of coals, sulfur dioxide, nitrogen oxides etc. are to ecological environment, especially atmospheric environment causes serious harm, causing that China's air environmental pollution is serious, haze weather takes place frequently.Based on pollution that caused by coal burning present situation, country has successively put into effect a series of law and regulation, and takes strong punitive measures.Although these regulations implement the aggravation of pollution that caused by coal burning degree is played certain containment effect, but the environmental objective to reach of distance is still poor very remote.
It is true that rural household fire coal environmental pollution can not be ignored.According to initial estimate, northern country often burns 1 ton high volatilization raw coal, it will the carbon dioxide (carbon emission coefficient 0.67), other of more than 150 kilograms that discharge more than 2.5 tons stain thing (oxidation of coal rate 0.85).Within 2014, civilian scattered burning coal consumption is 1.6 hundred million tons, only accounts for the 3.8% of whole nation coal consumption, and for sulfur dioxide (SO2) emissions, power plant of China annual emissions is 2,000,000 tons, and civilian scattered burning, then up to 3,200,000 tons, is 1.6 times of power plant emission total amount.Additionally, the series of problems such as the smoke contamination of civilian scattered burning coal, nitrogen oxides pollution, cinder pollution are inestimable especially to the destruction of ecological environment.But, by the impact of the factors such as region, economy, culture, solve very difficult.Want the pollution that caused by coal burning problem fundamentally solving rural area and samll cities and towns, for these areas provide high-qualitys, at a low price, the alternative fuel of cleaning be the task of top priority.
Domestic coke is based on bunker coal (thermal coal), and is aided with a small amount of coking coal, sulphur-fixing agent, carburant, combustion adjuvant etc., utilizes existing coke-oven plant to produce equipment, the clean solid fuel obtained by high-temperature retorting.Have that in bulk is good, moderate strength, low volatilization, low emission sulfur and the not easily advantage such as slagging scorification, it is not necessary to desulfurization equipment, tail gas can meet discharging standards；And easily igniting, continuous fire ability is strong, programming rate fast, firing duration is long, is the various desirable fuel of domestic life stove.
Coke is used as domestic fuel, it is necessary to the problem solving coke ignition temperature height, ignition difficulties.At present, metallurgical coke ignition temperature is about 600 DEG C, and bituminous coal and anthracitic ignition temperature respectively 350 DEG C and 500 DEG C.Therefore, it is necessary to by the introducing of combustion adjuvant, ignition temperature is down to about 400 DEG C, to meet domestic burners igniting requirement.
Patent about combustion-supporting agent for fuel coal is existing a lot, as CN90105106.3 discloses a kind of combustion-supporting agent for fuel coal, it contains at least one in boron mud, limestone, bauxite, white clay, manganese slag, ferrum oxide, canebreak and sodium carbonate, sodium nitrate, three kinds of sodium salts of sodium chloride, this combustion adjuvant can obviously improve combustion position, improves stove fire temperature；CN97105154.2 discloses a kind of combustion-supporting agent for fuel coal suitable in multiple coal, selected mine tailings, manganese dioxide, the waste residue of production potassium dichromate, the production waste residue of sodium dichromate, bauxite, sodium hydroxide, sodium carbonate, sodium nitrate, sodium oxide and canebreak to form by a certain percentage by boron mud, Calcium Carbide Ash, limestone, ferrum, during use, combustion adjuvant is mixed homogeneously by a certain percentage with coal；CN201310417513.8 discloses a kind of efficient energy-saving combustion-supporting agent for fuel coal and preparation method thereof, and its formula is made up of zinc oxide and manganese dioxide, can improve burning of coal activity and ignition performance, flame temperature.These combustion adjuvants are all the products for fire coal exploitation, mostly adopt and help the know-why that oxygen burns, are directly added into fire coal, promote coal fully to burn, the effect play combustion-supporting, energization, economizing on coal.Owing to domestic coke needs the special process through high-temperature retorting, the most of component in combustion-supporting agent for fuel coal can lose efficacy because of pyrolytic；Therefore, domestic coke cannot use the combustion-supporting agent for fuel coal of prior art.Through retrieval, the additive reducing domestic coke ignition temperature has no report.
Summary of the invention
Attapulgite clay compounded additive reducing domestic coke ignition temperature that it is an object of the invention to provide a kind of good cooling effect and its preparation method and application.
There is significant difference in the combustion adjuvant of the present invention and existing bibliographical information, is mainly manifested in: 1) mechanism that reduces ignition temperature is different.Tradition combustion-supporting agent for fuel coal is from as combustibles, because its ignition temperature is low, ignites coal by spontaneous combustion, therefore, adds absolute prohibition high-temperature process after combustion adjuvant, otherwise will lose combustion-supporting effect；The combustion-supporting catalytic action coming from composite oxides of the present invention.First, under high-temperature retorting reducing condition, rely on the catalytic gasification of auxiliary agent act on coke surface and be internally formed carbon defects, become the firing point of oxidizing fire；It addition, composite assistant is under high temperature reducing atmospheres, a small amount of microcrystalline can be formed, meet oxygen very easily combustion heat release and form localized hyperthermia's point, thus the coke that ignites.2) stage is added different.Tradition combustion-supporting agent for fuel coal many moulded coal preparation before add, then blended, bond, cold moudling；Or after mixing, directly enter stove burning with scattered coal.This patent auxiliary agent adds when dry distilling coal blending, blended, make firm by ramming, high-temperature retorting becomes civilian clean coke.
Attapulgite be a kind of have chain layer structure containing Shuifu County's zeopan clay mineral, its structure belongs to 2:1 type clay mineral.Attapulgite has big specific surface area (9.6～36m2/ g) with more flourishing microcellular structure, its structure exists crystal lattice, containing variable amount of Na in crystal+、Ca2+、Fe3+、Al3+, crystal is needle-like, fibrous or fiber collection shape.Its desirable chemical molecular formula is: Mg5Si8O20(OH)2(OH2)4·4H2O.The special physicochemical properties having due to attapulgite clay and processing performance so that it is be used widely in oil, chemical industry, building materials, papermaking, medicine, agricultural etc..
The chemical composition of attapulgite includes as follows:
Composition SiO2 Al2O3 Fe2O3 Na2O K2O
Content wt% 45.6～60.5 39.0～10.1 5.7～6.7 0.03～0.11 0.96～1.30
Composition CaO MgO MnO TiO2 LOI
Content wt% 0.42～1.95 10.7～11.35 0.1～0.61 0.32～0.6 7.5～11.8
Note: loss on ignition (Lossonignition, it is abbreviated as LOI), also known as igloss amount, refer at the percentage by weight that 105～110 DEG C of raw materials dried lose after 1000～1100 DEG C of calcinations, the CO that the water of crystallization discharged in heating process including raw material, carbonate decomposition go out2, the SO that goes out of sulphate decomposition2And organic impurities is excluded the loss of rear thing amount.
The present invention is first by attapulgite and the composite ignition temperature for reducing domestic coke of calcium carbonate.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of attapulgite clay compounded additive reducing domestic coke ignition temperature, its weight portion consists of attapulgite 30～60 parts, limestone 40～70 parts.
Preparation method of the present invention, comprises the steps:
(1) by dried attapulgite, limestone additive raw material respectively through thick broken, thin broken to granularity≤3mm；
(2) weigh the additive raw material crushed respectively, and be mixed, stir；
(3) the compound stirred, through dry grinding, makes raw material granularity≤150 order (0.1mm)；Then calcine 1～2 hour under 260～300 DEG C of conditions, be cooled to room temperature, be attapulgite clay compounded additive.
The application of the attapulgite clay compounded additive of the present invention, comprises the steps:
By attapulgite clay compounded additive: mixed coal weight ratio is 0.5-5.0:100, attapulgite clay compounded additive is added in mixed coal, gas retort completely cuts off air heat to 900～1100 DEG C, continuous heating 16～24h, then it is down to room temperature through quenching operation after being come out of the stove by red heat furnace charge, then through screening, namely obtain the domestic coke containing attapulgite clay compounded additive.
The quality index of mixed coal described above is: FCd>=50%, Vadf>=25%, Ad≤ 25%, Std< 1.5%.
Screening as above is that the furnace charge being down to room temperature sieves as 25-80mm granularity.
Prior art of the present invention is compared, and advantage that is that it directly brings and that necessarily lead to is as follows with good effect:
In the methods of the invention, the attapulgite clay compounded additive adopted, raw material sources extensively enrich, cheap, being added directly in mixed coal, prepare the domestic coke containing attapulgite clay compounded additive by high-temperature retorting, its ignition temperature can be reduced to 385～410 DEG C from 550～630 DEG C, decline temperature amplitude reaches 165～220 DEG C, and effect is notable.
In the methods of the invention, the domestic coke of production, compared with direct burning coal, oxysulfide reduces discharging more than 70% with nitrogen oxides, and flue dust reduces discharging more than 96%, to solving surrounding city life in the countryside coal, improve rural area and city environmental quality, reduce haze weather and be of great immediate significance.
Detailed description of the invention
Below the specific embodiment of the present invention is made and illustrating further.
Embodiment 1
(1) by dried attapulgite (chemical composition SiO255.5wt%；Al2O310.1wt%；Fe2O36.7wt%；Na2O0.11wt%；K2O1.30wt%；CaO1.93wt%；MgO11.35wt%；MnO0.61wt%；TiO20.6wt%；LOI11.8wt%), limestone additive raw material is respectively through thick broken, thin broken to granularity≤3mm；
(2) weigh the attapulgite 60kg, the limestone 40kg that have crushed successively respectively, and mixed, stir；
(3) the compound stirred, through dry grinding, makes raw material granularity≤150 order (0.1mm)；Then calcine 2 hours under 260 DEG C of conditions, be cooled to room temperature, be attapulgite clay compounded additive；
(4) as-fired coal material forms mixed coal with the jet coal of 20wt%, the meager coal of 15wt%, 1/3 coking coal of 30wt%, the rich coal of 20wt% and the coking coal of 15wt%；The quality index of its mixed coal is: Vadf30.0%, Ad13.5%, FCd60.6%, St,d0.67%；Adhesive index=74, fineness (≤3mm)=73.6%；
(5) by attapulgite clay compounded additive: mixed coal weight ratio is 0.5:100, the attapulgite clay compounded additive made is added in mixed coal, gas retort completely cuts off air heat to 1100 DEG C, continuous heating 16h, then it is down to room temperature through quenching operation after being come out of the stove by red heat furnace charge, then through screening, obtain the domestic coke containing potash feldspar compound additive that granularity is 25-80mm.At the NS18-2 type 150m that Beijing Chuan Zi stove company limited produces2In civilian reverberatory furnace, civilian Jiao of gained being carried out combustion test, test its pollutant effulent, compared with direct fire coal, oxysulfide reduces discharging 72%, and nitrogen oxides reduces discharging 70%, and flue dust reduces discharging 96%.
Comparative example: without any additive in mixed coal, completely cuts off air in gas retort and heats to 1100 DEG C, and continuous heating 16h is down to room temperature through quenching operation after then being come out of the stove by red heat furnace charge, and then through screening, the coke that gained granularity is 25-80mm is burnt as comparison.
Respectively with Jiao, civilian Jiao of gained and comparison being carried out burning-point test experiments in JDRD-5A type determination of ignition point instrument, experimental result is as shown in table 1.
Table 1 adds compound additive and the burning-point contrast being not added with compound additive coke
Embodiment 2
(1) by dried attapulgite (chemical composition SiO253.2wt%；Al2O314.8wt%；Fe2O36.4wt%；Na2O0.09wt%；K2O1.20wt%；CaO1.63wt%；MgO11.1wt%；MnO0.49wt%；TiO20.52wt%；LOI10.57wt%), limestone additive raw material is respectively through thick broken, thin broken to granularity≤3mm；
(2) weigh the attapulgite 52.5kg, the limestone 47.5kg that have crushed successively respectively, and mixed, stir；
(3) the compound stirred, through dry grinding, makes raw material granularity≤150 order (0.1mm)；Then calcine 1.8 hours under 270 DEG C of conditions, pack after being cooled to room temperature, be attapulgite clay compounded additive；
(4) as-fired coal forms mixed coal with the weakly caking coal of 30wt%, the jet coal of 40wt%, the gas rich coal of 20wt% and the dross coal of 10wt%；Its quality index (wt%): Vadf35.0%, Ad13.5%, FCd56.2%, St,d0.84%, adhesive index=40, fineness (≤3mm)=86.5%；
(5) by attapulgite clay compounded additive: mixed coal weight ratio is that the attapulgite clay compounded additive made is added in mixed coal by 1.8:100, gas retort completely cuts off air heat to 1050 DEG C, continuous heating 18h, then it is down to room temperature through quenching operation after being come out of the stove by red heat furnace charge, then through screening, obtain the domestic coke containing potash feldspar compound additive that granularity is 25-80mm.At the NS18-2 type 150m that Beijing Chuan Zi stove company limited produces2In civilian reverberatory furnace, civilian Jiao of gained being carried out combustion test, test its pollutant effulent, compared with direct fire coal, oxysulfide reduces discharging 74%, and nitrogen oxides reduces discharging 71%, and flue dust reduces discharging 96.5%.
Comparative example: without any additive in mixed coal, completely cuts off air in gas retort and heats to 1050 DEG C, and continuous heating 18h is down to room temperature through quenching operation after then being come out of the stove by red heat furnace charge, and then through screening, the coke that gained granularity is 25-80mm is burnt as comparison.
Respectively with Jiao, civilian Jiao of gained and comparison being carried out burning-point test experiments in JDRD-5A type determination of ignition point instrument, experimental result is as shown in table 2.
Table 2 adds compound additive and the burning-point contrast being not added with compound additive coke
Experiment group Burning-point DEG C Decline temperature DEG C
Comparison is burnt 570 -
Add civilian Jiao of compound additive 390 180
Embodiment 3
(1) by dried attapulgite (chemical composition SiO250.6wt%；Al2O319.6wt%；Fe2O36.1wt%；Na2O0.07wt%；K2O1.15wt%；CaO1.21wt%；MgO10.92wt%；MnO0.34wt%；TiO20.47wt%；LOI9.54wt%), limestone additive raw material is respectively through thick broken, thin broken to granularity≤3mm；
(2) weigh the attapulgite 45kg, the limestone 55kg that have crushed successively respectively, and mixed, stir；
(3) the compound stirred, through dry grinding, makes raw material granularity≤150 order (0.1mm)；Then calcine 1.5 hours under 280 DEG C of conditions, pack after being cooled to room temperature, be attapulgite clay compounded additive；
(4) as-fired coal material forms mixed coal with the jet coal of 20wt%, the meager coal of 15wt%, 1/3 coking coal of 30wt%, the rich coal of 20wt% and the coking coal of 15wt%；The quality index of its mixed coal is: Vadf30.0%, Ad13.5%, FCd60.6%, St,d0.67%；Adhesive index=74, fineness (≤3mm)=73.6%；
(5) by attapulgite clay compounded additive: mixed coal weight ratio is that the attapulgite clay compounded additive made is added in mixed coal by 2.5:100, gas retort completely cuts off air heat to 1000 DEG C, continuous heating 20h, then it is down to room temperature through quenching operation after being come out of the stove by red heat furnace charge, then through screening, obtain the domestic coke containing potash feldspar compound additive that granularity is 25-80mm.At the NS18-2 type 150m that Beijing Chuan Zi stove company limited produces2In civilian reverberatory furnace, civilian Jiao of gained being carried out combustion test, test its pollutant effulent, compared with direct fire coal, oxysulfide reduces discharging 76%, and nitrogen oxides reduces discharging 72%, and flue dust reduces discharging 97%；
Comparative example: without any additive in mixed coal, completely cuts off air in gas retort and heats to 1000 DEG C, and continuous heating 20h is down to room temperature through quenching operation after then being come out of the stove by red heat furnace charge, and then through screening, the coke that gained granularity is 25-80mm is burnt as comparison.
Respectively with Jiao, civilian Jiao of gained and comparison being carried out burning-point test experiments in JDRD-5A type determination of ignition point instrument, experimental result is as shown in table 3.
Table 3 adds compound additive and the burning-point contrast being not added with compound additive coke
Experiment group Burning-point DEG C Decline temperature DEG C
Comparison is burnt 590 -
Add civilian Jiao of compound additive 395 195
Embodiment 4
(1) by dried attapulgite (chemical composition SiO248.1wt%；Al2O324.3wt%；Fe2O35.9wt%；Na2O0.05wt%；K2O1.04wt%；CaO0.82wt%；MgO10.7wt%；MnO0.21wt%；TiO20.4wt%；LOI8.48wt%), limestone additive raw material is respectively through thick broken, thin broken to granularity≤3mm；
(2) weigh the attapulgite 37.5kg, the limestone 62.5kg that have crushed successively respectively, and mixed, stir；
(3) the compound stirred, through dry grinding, makes raw material granularity≤150 order (0.1mm)；Then calcine 1.3 hours under 290 DEG C of conditions, pack after being cooled to room temperature, be attapulgite clay compounded additive；
(4) as-fired coal forms mixed coal with the weakly caking coal of 30wt%, the jet coal of 40wt%, the gas rich coal of 20wt% and the dross coal of 10wt%；Its quality index (wt%): Vadf35.0%, Ad13.5%, FCd56.2%, St,d0.84%, adhesive index=40, fineness (≤3mm)=86.5%；
(5) by attapulgite clay compounded additive: mixed coal weight ratio is that the attapulgite clay compounded additive made is added in mixed coal by 3.8:100, gas retort completely cuts off air heat to 950 DEG C, continuous heating 22h, then it is down to room temperature through quenching operation after being come out of the stove by red heat furnace charge, then through screening, obtain the domestic coke containing potash feldspar compound additive that granularity is 25-80mm.At the NS18-2 type 150m that Beijing Chuan Zi stove company limited produces2In civilian reverberatory furnace, civilian Jiao of gained being carried out combustion test, test its pollutant effulent, compared with direct fire coal, oxysulfide reduces discharging 77%, and nitrogen oxides reduces discharging 73%, and flue dust reduces discharging 97.5%.
Comparative example: without any additive in mixed coal, completely cuts off air in gas retort and heats to 950 DEG C, and continuous heating 22h is down to room temperature through quenching operation after then being come out of the stove by red heat furnace charge, and then through screening, the coke that gained granularity is 25-80mm is burnt as comparison.
Respectively with Jiao, civilian Jiao of gained and comparison being carried out burning-point test experiments in JDRD-5A type determination of ignition point instrument, experimental result is as shown in table 4.
Table 4 adds compound additive and the burning-point contrast being not added with compound additive coke
Experiment group Burning-point DEG C Decline temperature DEG C
Comparison is burnt 610 -
Add civilian Jiao of compound additive 400 210
Embodiment 5
(1) by dried attapulgite (chemical composition SiO245.6wt%；Al2O329.0wt%；Fe2O35.7wt%；Na2O0.03wt%；K2O0.93wt%；CaO0.42wt%；MgO10.4wt%；MnO0.1wt%；TiO20.32wt%；LOI7.5wt%), limestone additive raw material is respectively through thick broken, thin broken to granularity≤3mm；
(2) weigh the attapulgite 30kg, the limestone 70kg that have crushed successively respectively, and mixed, stir；
(3) the compound stirred, through dry grinding, makes raw material granularity≤150 order (0.1mm)；Then calcine 1 hour under 300 DEG C of conditions, pack after being cooled to room temperature, be attapulgite clay compounded additive；
(4) as-fired coal material forms mixed coal with the jet coal of 20wt%, the meager coal of 15wt%, 1/3 coking coal of 30wt%, the rich coal of 20wt% and the coking coal of 15wt%；The quality index of its mixed coal is: Vadf30.0%, Ad13.5%, FCd60.6%, St,d0.67%；Adhesive index=74, fineness (≤3mm)=73.6%；
(5) by attapulgite clay compounded additive: mixed coal weight ratio is 5.0:100, the attapulgite clay compounded additive made is added in mixed coal, gas retort completely cuts off air heat to 900 DEG C, continuous heating 24h, then it is down to room temperature through quenching operation after being come out of the stove by red heat furnace charge, then through screening, obtain the domestic coke containing potash feldspar compound additive that granularity is 25-80mm.At the NS18-2 type 150m that Beijing Chuan Zi stove company limited produces2In civilian reverberatory furnace, civilian Jiao of gained being carried out combustion test, test its pollutant effulent, compared with direct fire coal, oxysulfide reduces discharging 78%, and nitrogen oxides reduces discharging 74%, and flue dust reduces discharging 98%；
Comparative example: without any additive in mixed coal, completely cuts off air in gas retort and heats to 900 DEG C, and continuous heating 24h is down to room temperature through quenching operation after then being come out of the stove by red heat furnace charge, and then through screening, the coke that gained granularity is 25-80mm is burnt as comparison.
Respectively with Jiao, civilian Jiao of gained and comparison being carried out burning-point test experiments in JDRD-5A type determination of ignition point instrument, experimental result is as shown in table 5.
Table 5 adds compound additive and the burning-point contrast being not added with compound additive coke
Experiment group Burning-point DEG C Decline temperature DEG C
Comparison is burnt 630 -
Add civilian Jiao of compound additive 410 220
By embodiment 1～5 experimental result it can be seen that after adding attapulgite clay compounded additive, significantly reduce the burning-point of domestic coke so that domestic coke is more easy to and catches fire, it is ensured that domestic coke is as the application of a kind of fuel.

Claims (6)

1. the attapulgite clay compounded additive reducing domestic coke ignition temperature, it is characterised in that the weight portion of the attapulgite clay compounded additive reducing domestic coke ignition temperature consists of attapulgite 30～60 parts, limestone 40～70 parts.
2. a kind of attapulgite clay compounded additive reducing domestic coke ignition temperature as claimed in claim 1, it is characterised in that described attapulgite percentage by weight chemical composition includes as follows:
SiO245.6-60.5；Al2O339.0-10.1；Fe2O35.7-6.7；Na2O0.03-0.11；K2O0.96-1.30；CaO0.42-1.95；MgO10.7-11.35；MnO0.1-0.61；TiO20.32-0.6；LOI7.5-11.8.
3. the preparation method of a kind of attapulgite clay compounded additive reducing domestic coke ignition temperature as claimed in claim 1 or 2, it is characterised in that comprise the steps:
(1) by dried attapulgite, limestone additive raw material respectively through thick broken, thin broken to granularity≤3mm；
(2) weigh the additive raw material crushed respectively, and be mixed, stir；
(3) the compound stirred, through dry grinding, makes raw material granularity≤0.1mm, then calcines 1～2 hour under 260～300 DEG C of conditions, is cooled to room temperature, is attapulgite clay compounded additive.
4. the application of a kind of attapulgite clay compounded additive reducing domestic coke ignition temperature as claimed in claim 1 or 2, it is characterised in that comprise the steps:
By attapulgite clay compounded additive: mixed coal weight ratio is 0.5-5.0:100, attapulgite clay compounded additive is added in mixed coal, gas retort completely cuts off air heat to 900～1100 DEG C, continuous heating 16～24h, then it is down to room temperature through quenching operation after being come out of the stove by red heat furnace charge, then through screening, namely obtain the domestic coke containing attapulgite clay compounded additive.
5. the application of a kind of attapulgite clay compounded additive reducing domestic coke ignition temperature as claimed in claim 4, it is characterised in that the quality index of described mixed coal is: FCd>=50%, Vadf>=25%, Ad≤ 25%, Std< 1.5%.
6. the application of a kind of attapulgite clay compounded additive reducing domestic coke ignition temperature as claimed in claim 4, it is characterised in that described screening is that the furnace charge that will drop to room temperature sieves as 25-80mm granularity.
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CN107474863A (en) * 2017-08-29 2017-12-15 太原理工大学 Reduce sawdust additive and preparation method and the application of domestic coke ignition temperature
CN107502404A (en) * 2017-08-29 2017-12-22 太原理工大学 Reduce powder of straw compound additive and preparation method and the application of domestic coke ignition temperature

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107118790A (en) * 2017-06-09 2017-09-01 太原理工大学 Reduce Ni-based compound additive and preparation method and the application of domestic coke nitrogen content
CN107474863A (en) * 2017-08-29 2017-12-15 太原理工大学 Reduce sawdust additive and preparation method and the application of domestic coke ignition temperature
CN107502404A (en) * 2017-08-29 2017-12-22 太原理工大学 Reduce powder of straw compound additive and preparation method and the application of domestic coke ignition temperature

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