CN107418643A - Reduce lignite compound additive and preparation method and the application of domestic coke ignition temperature - Google Patents

Reduce lignite compound additive and preparation method and the application of domestic coke ignition temperature Download PDF

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Publication number
CN107418643A
CN107418643A CN201710755087.7A CN201710755087A CN107418643A CN 107418643 A CN107418643 A CN 107418643A CN 201710755087 A CN201710755087 A CN 201710755087A CN 107418643 A CN107418643 A CN 107418643A
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China
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lignite
compound additive
coal
parts
ignition temperature
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杜文广
刘守军
张智聪
杨颂
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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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Priority to CN201710755087.7A priority Critical patent/CN107418643A/en
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS 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
    • C10L10/00Use of additives to fuels or fires for particular purposes
    • C10L10/02Use of additives to fuels or fires for particular purposes for reducing smoke development
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS 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
    • C10L5/00Solid fuels
    • C10L5/02Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/04Raw material of mineral origin to be used; Pretreatment thereof
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS 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
    • C10L9/00Treating solid fuels to improve their combustion
    • C10L9/10Treating solid fuels to improve their combustion by using additives
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS 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
    • C10L2290/00Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/58Control or regulation of the fuel preparation of upgrading process

Abstract

A kind of parts by weight composition of lignite compound additive for reducing domestic coke ignition temperature is 50~70 parts of lignite, 20~30 parts of lime stone, 10~20 parts of potassium feldspar, 5~10 parts of manganese dioxide.Raw material sources of the present invention enrich extensively, it is cheap, ignition temperature can be reduced to 387~437 DEG C from 545~625 DEG C, decline temperature amplitude is up to 158~188 DEG C, compared with direct burning coal, oxysulfide emission reduction more than 50%, flue dust emission reduction more than 70%, 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.

Description

Reduce lignite compound additive and preparation method and the application of domestic coke ignition temperature
Technical field
The present invention relates to a kind of lignite compound additive and preparation method and application for reducing domestic coke ignition temperature.
Background technology
Coal burning be China at present so that from now on for quite a long time obtain the energy major way, a large amount of coals it is direct The dust of burning and exhausting, sulfur dioxide, nitrogen oxides etc. cause serious harm to ecological environment, especially atmospheric environment, Cause that China's air environmental pollution is serious, and 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 take strong punitive measures.Although aggravation of the implementation of these regulations to pollution that caused by coal burning degree rises Acted on to certain containment, but still poor very remote of the distance environmental objective to be reached.
In fact, rural household fire coal environmental pollution can not be ignored.According to initial estimate, northern country often burns 1 ton of height Volatilize raw coal, it will discharges more than 2.5 tons of carbon dioxide (carbon emission coefficient 0.67), more than 150 kilograms other stain thing (oxidation of coal rate 0.85).Civilian scattered burning coal consumption is 1.6 hundred million tons within 2014, the 3.8% of national coal consumption is only accounted for, with sulfur dioxide Exemplified by discharge, power plant of China annual emissions are 2,000,000 tons, and civilian scattered burning is then up to 3,200,000 tons, is the 1.6 of power plant emission total amount Times.In addition, a series of problems, such as smoke contamination of civilian scattered burning coal, nitrogen oxides pollution, cinder pollution, is to ecological environment Destroy even more inestimable.However, being influenceed by factors such as region, economy, culture, solve very difficult.Want from root Solve the problems, such as the pollution that caused by coal burning of rural area and samll cities and towns in sheet, provide high-quality, low price for these areas, the alternative fuel of cleaning is to work as Business is anxious.
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., Using existing coke-oven plant's production equipment, pass through clean solid fuel obtained by high-temperature retorting.With blocking good, moderate strength, low Volatilization, low emission sulphur and the advantages that be not easy slagging, without desulfurization equipment, tail gas can meet discharging standards;And easy point Fire, continuous fiery ability is strong, programming rate is fast, firing duration length, is the various preferable fuel of domestic life stove.
Coke is used as domestic fuel, it is necessary to solves the problems, such as coke ignition temperature height, ignition difficulties.At present, metallurgical coke Fiery temperature is 600 DEG C or so, and bituminous coal and anthracitic ignition temperature are respectively 350 DEG C and 500 DEG C.Therefore, it is necessary to by helping The introducing of agent is fired, ignition temperature is down to 400 DEG C or so, to meet civilian furnace igniting requirement.
Patent on combustion-supporting agent for fuel coal is a lot, and as CN90105106.3 discloses a kind of combustion-supporting agent for fuel coal, it contains There are three kinds of boron mud, lime stone, bauxite, white clay, manganese slag, iron oxide, canebreak and sodium carbonate, sodium nitrate, sodium chloride sodium At least one of salt, the combustion adjuvant can obviously improve combustion position, improve stove fire temperature;CN97105154.2 discloses a kind of suitable For the combustion-supporting agent for fuel coal of a variety of coals, mine tailings, manganese dioxide, production potassium bichromate are selected by boron mud, Calcium Carbide Ash, lime stone, iron Waste residue, produce sodium dichromate waste residue, bauxite, sodium hydroxide, sodium carbonate, sodium nitrate, sodium oxide molybdena and canebreak press one Certainty ratio forms, and is well mixed combustion adjuvant by a certain percentage with coal during use;CN201310417513.8 discloses one Kind efficient energy-saving combustion-supporting agent for fuel coal and preparation method thereof, 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 the products for coal-fired exploitation, mostly using the skill for helping oxygen to burn Art principle, is directly added into fire coal, promotes coal fully to burn, and plays a part of combustion-supporting, energization, economizes on coal.Because domestic coke needs To pass through the special process of high-temperature retorting, most of component in combustion-supporting agent for fuel coal can fail because of pyrolytic;Therefore, it is civilian Coke can not use the combustion-supporting agent for fuel coal of prior art.
The content of the invention
It is an object of the invention to provide a kind of lignite compound additive that can significantly reduce domestic coke ignition temperature and its Preparation method and application.
Be present significant difference in the present invention and the combustion adjuvant of existing literature report, be mainly manifested in:1) ignition temperature is reduced Mechanism is different.Traditional combustion-supporting agent for fuel coal itself is combustibles, because its ignition temperature is low, is ignited coal by spontaneous combustion, therefore, addition helps Absolute prohibition high-temperature process after combustion agent, otherwise will lose combustion-supporting effect;The combustion-supporting catalytic action for coming from composite oxides of the present invention. First under high-temperature retorting reducing condition, act on coke surface by the catalytic gasification of auxiliary agent and be internally formed carbon defects, into For the firing point of oxidizing fire;In addition, composite assistant under high temperature reducing atmospheres, can form a small amount of microcrystalline, oxygen pole is met Easy firing heat release forms localized hyperthermia's point, so as to the coke that ignites.Lignite is former added to domestic coke as reducing agent and activator In material, the formation of carbon defects and microcrystalline is promoted in high-temperature retorting, is acted as with other compositions one in compound additive With reducing the ignition temperature of domestic coke.2) it is different to add the stage.Traditional combustion-supporting agent for fuel coal is more to be added before prepared by moulded coal, so By mixing, bond, cold moudling;Or directly enter stove burning after being mixed with scattered coal.This patent auxiliary agent adds in destructive distillation coal blending, It is blended, make firm by ramming, high-temperature retorting turns into civilian clean coke.
Lignite, also known as bavin coal, it is a kind of rudimentary coal of degree of coalification between peat and pitch coal, is peat through diagenesis The humic coal formed is acted on, degree of coalification is minimum, brown, dark brown or black, general dim or in pitchy luster, does not have viscous Knot property, activity is high, and chemical reactivity is strong.China's lignite reserves account for the 16% of world's lignite gross reserves, account for national coal reserves China's lignite annual production is up to 8.9 hundred million tons within 1/8 or so, 2015.The quality index of lignite is:Mad< 20%, Vdaf> 40%, Ad < 24%, St,d< 0.5%.
The present invention first compounds lignite and lime stone, potassium feldspar and manganese dioxide the temperature of catching fire for reducing domestic coke Degree.
To achieve these goals, the technical solution used in the present invention is as follows:
It is a kind of reduce domestic coke ignition temperature lignite compound additive, its parts by weight composition for 50~70 parts of lignite, 20~30 parts of lime stone, 10~20 parts of potassium feldspar, 5~10 parts of manganese dioxide.
Preparation method of the present invention, comprises the following steps:
(1) by raw materials such as lignite, lime stone, potassium feldspar and manganese dioxide respectively through thick broken, thin broken to granularity≤3mm.
(2) the additive raw material crushed is weighed respectively, and is mixed, and is stirred.
(3) the compound to stir is dried 1~2 hour under the conditions of 100~150 DEG C, then through dry grinding, makes raw material The mesh (0.15mm) of granularity≤100;It is subsequently cooled to normal temperature, as lignite compound additive.
The application of lignite compound additive of the present invention, comprises the following steps:
By lignite compound additive:Mixed coal weight ratio is 2.0~15.0:100, lignite compound additive is added to and matched somebody with somebody Close in coal, air is completely cut off in gas retort and is heated to 900~1100 DEG C, 16~24h of continuous heating, then red heat furnace charge is come out of the stove Normal temperature is down to by quenching process, then it is screened, that is, obtain domestic coke.
The quality index of the mixed coal is:FCd>=50%, Vdaf>=25%, Ad≤ 13.5%, Std< 1.0%.
Described screening be down to normal temperature furnace charge screening be 25-80mm granularities.
The primary quality measure of domestic coke is as follows:Caloric value (Qnet,ar) >=5700kcal/kg, ash content (Ad)≤ 22wt%, volatile matter (Vd)≤5wt%, crushing strength (M25) >=75%, ignition temperature (T)≤420 DEG C, than surface (S)=20 ~40m2/g。
Prior art of the present invention is compared, it is that it directly brings and the advantages of necessarily lead to it is as follows with good effect:
In the methods of the invention, used lignite compound additive, raw material sources enrich extensively, cheap, directly Connecing added in mixed coal, domestic coke is made by high-temperature retorting, its ignition temperature can be reduced to 354 from 545~625 DEG C~ 407.5 DEG C, decline temperature amplitude is up to 191~217.5 DEG C, significant effect.
In the methods of the invention, the domestic coke of production, compared with direct burning coal, oxysulfide emission reduction 50% with On, flue dust emission reduction more than 70%, to solving surrounding city life in the countryside coal, improve rural area and city environmental quality, reduce mist Haze weather is of great immediate significance.
Embodiment
Embodiment of the invention is made below and further being illustrated.
Embodiment 1
(1) by raw materials such as lignite, lime stone, potassium feldspar and manganese dioxide respectively through thick broken, thin broken to granularity≤3mm.
(2) lignite (the quality index crushed is weighed respectively successively:Mad13.35%, Vdaf40.25%, Ad16.93%, St,d0.21%) 70kg, lime stone 20kg, potassium feldspar 10kg and manganese dioxide 5kg, are mixed, and stir.
(3) the compound to stir is dried 2 hours under the conditions of 100 DEG C, then through dry grinding, makes raw material granularity≤100 Mesh (0.15mm);It is subsequently cooled to normal temperature, as lignite compound additive (concrete composition:FCd30.9wt%, Vd30.2wt%, CaCO318.2wt%, K2O1.6wt%, MnO24.8wt%, MgO0.2wt%, Al2O32.0wt%, SiO29.6wt%, Fe2O30.1wt%, CaO2.1wt%, St,d0.4wt%).
As-fired coal material by 20wt% jet coal, 15wt% meager coal, 30wt 1/3 coking coal, 20wt% rich coal and 15wt% coking coal, which coordinates, forms mixed coal;The quality index of its mixed coal is:Vdaf30.0%, Ad13.5%, FCd60.6%, St,d0.67%;Adhesive index=74, fineness (≤3mm)=73.6%.
(5) lignite compound additive is pressed:Mixed coal weight ratio is 15.0:100, the lignite compound additive made is added Into mixed coal, isolation air is heated to 1100 DEG C in gas retort, continuous heating 16h, is passed through after then red heat furnace charge is come out of the stove Quenching process is down to normal temperature, then screened, obtains the domestic coke that granularity is 25-80mm;Its primary quality measure:Caloric value (Qnet,ar) 5904kcal/kg, ash content (Ad) 20.5wt%, volatile matter (Vd) 4.3wt%, crushing strength (M25) 75.2%, catch fire 354 DEG C of temperature (T), than surface (S) 39.6m2/g。
The NS18-2 types 150m that Chuan Zi stoves Co., Ltd produces in Beijing2Burnt progress civilian to gained in civilian reverberatory furnace Combustion test, its pollutant effulent is tested, compared with direct fire coal, oxysulfide emission reduction 60%, flue dust emission reduction 78.5%.
Comparative example:Any additive is not added in mixed coal, air is completely cut off in gas retort and is heated to 1100 DEG C, is persistently added Hot 16h, normal temperature is down to through quenching process after then red heat furnace charge is come out of the stove, then it is screened, gained granularity is 25-80mm coke It is burnt as control.
Civilian to gained burnt and control carries out burning-point test experiments with Jiao respectively in JDRD-5A type determination of ignition point instrument, real It is as shown in table 1 to test result.
Table 1 adds compound additive and is not added with the burning-point contrast of compound additive coke
Test group Burning-point DEG C Decline temperature DEG C
Control is burnt 545 -
Add civilian Jiao of compound additive 354 191
Embodiment 2
(1) by raw materials such as lignite, lime stone, potassium feldspar and manganese dioxide respectively through thick broken, thin broken to granularity≤3mm.
(2) lignite (the quality index crushed is weighed respectively successively:Mad9.29%, Vdaf44.53%, Ad17.66%, St, d0.32%) 65kg, lime stone 22.5kg, potassium feldspar 13kg and manganese dioxide 6.3kg, are mixed, and stir.
(3) the compound to stir is dried 1.8 hours under the conditions of 112.5 DEG C, then through dry grinding, makes raw material granularity ≤ 100 mesh (0.15mm);It is subsequently cooled to normal temperature, as lignite compound additive (concrete composition:FCd30.1wt%, Vd20.3wt%, CaCO320.1wt%, K2O2.1wt%, MnO25.9wt%, MgO0.2wt%, Al2O32.5wt%, SiO214.4wt%, Fe2O30.1wt%, CaO4.1wt%, St,d0.1wt%).
(4) as-fired coal not gluing by 30wt% weakly caking coal, 40wt% jet coal, 20wt% gas rich coal and 10wt% Coal, which coordinates, forms mixed coal;Its quality index (wt%):Vdaf35.0%, Ad13.5%, FCd56.2%, St,d0.84%, bond Index G=40, fineness (≤3mm)=86.5%.
(5) lignite compound additive is pressed:Mixed coal weight ratio is 11.8:100, the lignite compound additive made is added Into mixed coal, isolation air is heated to 1050 DEG C in gas retort, continuous heating 18h, is passed through after then red heat furnace charge is come out of the stove Quenching process is down to normal temperature, then screened, obtains the domestic coke that granularity is 25-80mm;Its primary quality measure:Caloric value (Qnet,ar) 5857kcal/kg, ash content (Ad) 21.3wt%, volatile matter (Vd) 4.1wt%, crushing strength (M25) 77.4%, Fiery 363.5 DEG C of temperature (T), than surface (S) 36.3m2/g。
The NS18-2 types 150m that Chuan Zi stoves Co., Ltd produces in Beijing2Burnt progress civilian to gained in civilian reverberatory furnace Combustion test, its pollutant effulent is tested, compared with direct fire coal, oxysulfide emission reduction 59%, flue dust emission reduction 78%.
Comparative example:Any additive is not added in mixed coal, air is completely cut off in gas retort and is heated to 1050 DEG C, is persistently added Hot 18h, normal temperature is down to through quenching process after then red heat furnace charge is come out of the stove, then it is screened, gained granularity is 25-80mm coke It is burnt as control.
Civilian to gained burnt and control carries out burning-point test experiments with Jiao respectively in JDRD-5A type determination of ignition point instrument, real It is as shown in table 2 to test result.
Table 2 adds compound additive and is not added with the burning-point contrast of compound additive coke
Test group Burning-point DEG C Decline temperature DEG C
Control is burnt 565 -
Add civilian Jiao of compound additive 363.5 201.5
Embodiment 3
(1) by raw materials such as lignite, lime stone, potassium feldspar and manganese dioxide respectively through thick broken, thin broken to granularity≤3mm.
(2) lignite (the quality index crushed is weighed respectively successively:Mad10.25%, Vdaf44.82%, Ad16.98%, St,d0.68%) 60kg, lime stone 25kg, potassium feldspar 15kg and manganese dioxide 7.5kg, are mixed, and stir.
(3) the compound to stir is dried 1.5 hours under the conditions of 125 DEG C, then through dry grinding, make raw material granularity≤ 100 mesh (0.15mm);It is subsequently cooled to normal temperature, as lignite compound additive (concrete composition:FCd25.3wt%, Vd20.5wt%, CaCO322.2wt%, K2O2.4wt%, MnO27.0wt%, MgO0.2wt%, Al2O32.9wt%, SiO215.4wt%, Fe2O30.1wt%, CaO3.9wt%, St,d0.2wt%).
As-fired coal material by 20wt% jet coal, 15wt% meager coal, 30wt% 1/3 coking coal, 20wt% rich coal Coordinate with 15wt% coking coal and form mixed coal;The quality index of its mixed coal is:Vdaf30.0%, Ad13.5%, FCd60.6%, St,d0.67%;Adhesive index=74, fineness (≤3mm)=73.6%.
(5) lignite compound additive is pressed:Mixed coal weight ratio is 8.5:100, the lignite compound additive made is added to In mixed coal, isolation air is heated to 1000 DEG C, continuous heating 20h in gas retort, through putting out after then red heat furnace charge is come out of the stove Burnt process is down to normal temperature, then screened, obtains the domestic coke that granularity is 25-80mm;Its primary quality measure:Caloric value (Qnet,ar) 5934kcal/kg, ash content (Ad) 20.7wt%, volatile matter (Vd) 3.7wt%, crushing strength (M25) 81.0%, catch fire 371.5 DEG C of temperature (T), than surface (S) 31.3m2/g。
The NS18-2 types 150m that Chuan Zi stoves Co., Ltd produces in Beijing2Burnt progress civilian to gained in civilian reverberatory furnace Combustion test, its pollutant effulent is tested, compared with direct fire coal, oxysulfide emission reduction 58%, flue dust emission reduction 78.5%.
Comparative example:Any additive is not added in mixed coal, air is completely cut off in gas retort and is heated to 1000 DEG C, is persistently added Hot 20h, normal temperature is down to through quenching process after then red heat furnace charge is come out of the stove, then it is screened, gained granularity is 25-80mm coke It is burnt as control.
Civilian to gained burnt and control carries out burning-point test experiments with Jiao respectively in JDRD-5A type determination of ignition point instrument, real It is as shown in table 3 to test result.
Table 3 adds compound additive and is not added with the burning-point contrast of compound additive coke
Test group Burning-point DEG C Decline temperature DEG C
Control is burnt 585 -
Add civilian Jiao of compound additive 371.5 213.5
Embodiment 4
(1) by raw materials such as lignite, lime stone, potassium feldspar and manganese dioxide respectively through thick broken, thin broken to granularity≤3mm.
(2) lignite (the quality index crushed is weighed respectively successively:Mad12.88%, Vdaf45.04%, Ad23.83%, St,d0.17%) 55kg, lime stone 27.5kg, potassium feldspar 18kg and manganese dioxide 8.7kg, are mixed, and are stirred equal It is even.
(3) the compound to stir is dried 1.3 hours under the conditions of 137.5 DEG C, then through dry grinding, makes raw material granularity ≤ 100 mesh (0.15mm);It is subsequently cooled to normal temperature, as lignite compound additive (concrete composition:FCd22.7wt%, Vd18.7wt%, CaCO324.0wt%, K2O2.8wt%, MnO28.0wt%, MgO0.2wt%, Al2O33.4wt%, SiO216.2wt%, Fe2O30.2wt%, CaO3.4wt%, St,d0.3wt%).
(4) as-fired coal not gluing by 30wt% weakly caking coal, 40wt% jet coal, 20wt% gas rich coal and 10wt% Coal, which coordinates, forms mixed coal;Its quality index (wt%):Vdaf35.0%, Ad13.5%, FCd56.2%, St,d0.84%, bond Index G=40, fineness (≤3mm)=86.5%.
(5) lignite compound additive is pressed:Mixed coal weight ratio is 5.3:100, the lignite compound additive made is added to In mixed coal, isolation air is heated to 950 DEG C, continuous heating 22h in gas retort, through quenching after then red heat furnace charge is come out of the stove Process is down to normal temperature, then screened, obtains the domestic coke that granularity is 25-80mm;Its primary quality measure:Caloric value (Qnet,ar) 6028kcal/kg, ash content (Ad) 19.8wt%, volatile matter (Vd) 3.4wt%, crushing strength (M25) 84.1%, catch fire 398 DEG C of temperature (T), than surface (S) 26.2m2/g。
The NS18-2 types 150m that Chuan Zi stoves Co., Ltd produces in Beijing2Burnt progress civilian to gained in civilian reverberatory furnace Combustion test, its pollutant effulent is tested, compared with direct fire coal, oxysulfide emission reduction 56%, flue dust emission reduction 78%.
Comparative example:Any additive is not added in mixed coal, air is completely cut off in gas retort and is heated to 950 DEG C, is persistently added Hot 22h, normal temperature is down to through quenching process after then red heat furnace charge is come out of the stove, then it is screened, gained granularity is 25-80mm coke It is burnt as control.
Civilian to gained burnt and control carries out burning-point test experiments with Jiao respectively in JDRD-5A type determination of ignition point instrument, real It is as shown in table 4 to test result.
Table 4 adds compound additive and is not added with the burning-point contrast of compound additive coke
Test group Burning-point DEG C Decline temperature DEG C
Control is burnt 605 -
Add civilian Jiao of compound additive 398 207
Embodiment 5
(1) by raw materials such as lignite, lime stone, potassium feldspar and manganese dioxide respectively through thick broken, thin broken to granularity≤3mm.
(2) lignite (the quality index crushed is weighed respectively successively:Mad19.6%, Vdaf49.1%, Ad7.7%, St, d0.58%) 50kg, lime stone 30kg, potassium feldspar 20kg and manganese dioxide 10kg, are mixed, and stir.
(3) the compound to stir is dried 1 hour under the conditions of 150 DEG C, then through dry grinding, makes raw material granularity≤100 Mesh (0.15mm);It is subsequently cooled to normal temperature, as lignite compound additive (concrete composition:FCd19.0wt%, Vd15.6wt%, CaCO326.0wt%, K2O3.1wt%, MnO29.1Wt%, MgO0.2wt%, Al2O33.7wt%, SiO218.8wt%, Fe2O30.2wt%, CaO4.3wt%, St,d0.1wt%).
As-fired coal material by 20wt% jet coal, 15wt% meager coal, 30wt% 1/3 coking coal, 20wt% rich coal Coordinate with 15wt% coking coal and form mixed coal;The quality index of its mixed coal is:Vdaf30.0%, Ad13.5%, FCd60.6%, St,d0.67%;Adhesive index=74, fineness (≤3mm)=73.6%.
(5) lignite compound additive is pressed:Mixed coal weight ratio is 2.0:100, the lignite compound additive made is added to In mixed coal, isolation air is heated to 900 DEG C, continuous heating 24h in gas retort, through quenching after then red heat furnace charge is come out of the stove Process is down to normal temperature, then screened, obtains the domestic coke that granularity is 25-80mm;Its primary quality measure:Caloric value (Qnet,ar) 6148kcal/kg, ash content (Ad) 18.6wt%, volatile matter (Vd) 3.1wt%, crushing strength (M25) 84.5%, catch fire 407.5 DEG C of temperature (T), than surface (S) 20.4m2/g。
The NS18-2 types 150m that Chuan Zi stoves Co., Ltd produces in Beijing2Burnt progress civilian to gained in civilian reverberatory furnace Combustion test, its pollutant effulent is tested, compared with direct fire coal, oxysulfide emission reduction 54%, flue dust emission reduction 77.5%.
Comparative example:Any additive is not added in mixed coal, air is completely cut off in gas retort and is heated to 900 DEG C, is persistently added Hot 24h, normal temperature is down to through quenching process after then red heat furnace charge is come out of the stove, then it is screened, gained granularity is 25-80mm coke It is burnt as control.
Civilian to gained burnt and control carries out burning-point test experiments with Jiao respectively in JDRD-5A type determination of ignition point instrument, real It is as shown in table 5 to test result.
Table 5 adds compound additive and is not added with the burning-point contrast of compound additive coke
Test group Burning-point DEG C Decline temperature DEG C
Control is burnt 625 -
Add civilian Jiao of compound additive 407.5 217.5
After can be seen that addition lignite compound additive by the experimental result of embodiment 1~5, civilian Jiao is significantly reduced The burning-point of charcoal so that domestic coke is more easy to catch fire, and ensure that domestic coke as a kind of application of fuel.

Claims (6)

1. a kind of lignite compound additive for reducing domestic coke ignition temperature, it is characterised in that parts by weight, which form, is:
50~70 parts of lignite, 20~30 parts of lime stone, 10~20 parts of potassium feldspar, 5~10 parts of manganese dioxide.
2. a kind of preparation method of lignite compound additive for reducing domestic coke ignition temperature as claimed in claim 1, its It is characterised by comprising the following steps:
(1) by raw materials such as lignite, lime stone, potassium feldspar and manganese dioxide respectively through thick broken, thin broken to granularity≤3mm;
(2) the additive raw material crushed is weighed respectively, and is mixed, and is stirred;
(3) the compound to stir is dried 1~2 hour under the conditions of 100~150 DEG C, then through dry grinding, makes raw material granularity ≤ 150 mesh;It is subsequently cooled to normal temperature, as lignite compound additive.
3. a kind of application of lignite compound additive for reducing domestic coke ignition temperature as claimed in claim 1, its feature It is to comprise the following steps:
By lignite compound additive:Mixed coal weight ratio is 2.0~15.0:100, lignite compound additive is added to mixed coal In, isolation air is heated to 900~1100 DEG C in gas retort, 16~24h of continuous heating, is passed through after then red heat furnace charge is come out of the stove Quenching process is down to normal temperature, then screened, that is, obtains the domestic coke containing lignite compound additive.
4. a kind of application of lignite compound additive for reducing domestic coke ignition temperature as claimed in claim 3, its feature The quality index for being the mixed coal is:FCd>=50%, Vdaf>=25%, Ad≤ 13.5%, Std< 1.0%.
5. a kind of application of lignite compound additive for reducing domestic coke ignition temperature as claimed in claim 3, its feature It is that to be down to the furnace charge screening of normal temperature be 25-80mm granularities to be described screening.
6. using the domestic coke prepared as described in claim any one of 3-5, it is characterised in that the prevailing quality of domestic coke Index is as follows:Caloric value >=5700kcal/kg, ash content≤22wt%, volatile matter≤5wt%, crushing strength >=75%, ignition temperature ≤ 420 DEG C, than 20~40m of surface2/g。
CN201710755087.7A 2017-08-29 2017-08-29 Reduce lignite compound additive and preparation method and the application of domestic coke ignition temperature Pending CN107418643A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105602640A (en) * 2016-02-24 2016-05-25 太原理工大学 Potassium feldspar composite additive for reducing ignition temperature of civil coke and preparing method and application
CN107011961A (en) * 2017-06-09 2017-08-04 太原理工大学 Lignite compound additive and preparation method and the application of civilian clean coke ignition temperature can effectively be reduced

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105602640A (en) * 2016-02-24 2016-05-25 太原理工大学 Potassium feldspar composite additive for reducing ignition temperature of civil coke and preparing method and application
CN107011961A (en) * 2017-06-09 2017-08-04 太原理工大学 Lignite compound additive and preparation method and the application of civilian clean coke ignition temperature can effectively be reduced

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Application publication date: 20171201