CN1087936A - A kind of preparation method of industrial shaping coal - Google Patents

Abstract

A kind of hard coal that adopts is the method that main coal prepares industrial shaping coal, it is characterized in that hard coal and brown coal in ratio coal blending in 7: 3, the admixture coal weighs 3-5% lime or acetylene slag and makes sulphur-fixing agent, after crushing and screening, under the water vapor heating condition, stir, material be not less than under 50 ℃ of states with weight be that coal weighs 3-5% and carried out the water vapor thermoplastic in advance and roll, temperature is not less than 65 ℃ canebreak and mixes and to continue to roll, spray coal simultaneously and weigh 3-5%, the heavy oil that temperature is 80 ℃ is cold-pressed into sphere immediately after rolling.

Description

A kind of preparation method of industrial shaping coal

The present invention relates to fuel, particularly a kind of moulded coal preparation method who makes fuel for Industrial Boiler.

For a long time, China's industry coal burning boiler is to be main burning coal with bituminous coal always, and based on the diffusing burning form of raw coal (fine coal).These a large amount of hard coals that make each real estate of China on the one hand because of its volatile matter is low can not be as industrial coal; On the other hand, scatter fire of raw coal, SO in the discharged flue gas ₂Content is higher, and is serious to topsoil.So in recent years, people were studying Industrial Coal Briquette Technology always, tried hard to replace diffusing coal to make industrial coal with moulded coal.

It is that main coal is manufactured moulded coal that the Industrial Coal Briquette Technology of present domestic report remains with bituminous coal, and the moulded coal that utilizes hard coal to manufacture for main raw material is just made family's coal consumption of living, can not make industrial coal.Its making method is with raw coal elder generation's a certain proportion of clay of admixture and lime, its medium clay soil mainly plays cohesive action, with its stronger cohesiveness non-cohesive hard coal is bondd, make coal be easy to compression moulding, and after moulding, reach certain intensity, be convenient to transportation and preserve, lime plays solid sulphur effect, and utilizes the sulphur that contains in wherein calcium oxide and the coal generation solid sulfate that reacts when burning to enter slag and reduce SO in the flue gas ₂Obnoxious flavour content.The hard coal that mixes clay and lime adds an amount of water after crushed and stirs, and stores up slaking through 24 hours, through coldmoulding.Why the moulded coal that this method is made can not make industrial coal, and reason is that the hard coal volatile matter is lower, is difficult for lighting, and it is slow that moulded coal is gone into the stove afterfire, can not satisfy the Industrial Boiler requirement, causes burning insufficient, and boiler thermal output reduces; Simultaneously, add clay in the coal and can improve pit ash, also can reduce boiler thermal output.

The purpose of this invention is to provide a kind of is the method that main coal prepares industrial shaping coal with hard coal.The moulded coal that adopts this method to manufacture, its volatile matter, ash content, intensity and water resistance all can satisfy the combustion requirements of Industrial Boiler.Thereby, and alleviate the diffusing coal of present burning to atmospheric pollution for anthracite resource is opened up new application approach.

Industrial shaping coal preparation method provided by the invention is with the weight ratio coal blending by 7: 3 of hard coal and brown coal; Press the heavy 3-5% of coal and add lime or acetylene slag; Pulverize, sieve through mechanism, make its granularity below 5 millimeters; Under the water vapor heating condition, stir then; Temperature of charge be not less than under 50 ℃ of states with weight be the heavy 3-5% of coal, carried out the water vapor thermoplastic in advance and rolled, its temperature is not less than 65 ℃ canebreak mixing, continued to roll 8-10 minute, when rolling, be not less than 80 ℃ heavy oil in the ratio spray temperature of the heavy 3-5% of coal; Be cold-pressed into sphere after rolling immediately.

Above-mentioned moulded coal preparation method why in hard coal with addition of a certain proportion of brown coal, exactly in order to remedy the low shortcoming of hard coal volatile matter.Anthracitic volatile matter is analyzed base value and is generally 7-10%, and the volatile matter of brown coal is analyzed base value and is generally about 30%, and two tons to ten tons Industrial Boiler uses its volatile matter of coal general requirement between 20% to 23%.With the weight ratio coal blending of hard coal and brown coal by 7: 3, its volatile matter is analyzed base value can reach 20%, add in the moulded coal forming process also will add canebreak and heavy oil, its volatile matter can be brought up to more than 20%, and this just can satisfy the volatile matter requirement of Industrial Boiler to coal.If further improve brown coal with addition of amount, though volatile matter can further improve,, surpass the ash value that boiler requires because the ash content also higher (the general analysis base value is 35-40%) of brown coal can make the moulded coal ash content too high, cause boiler thermal output to reduce.

The purpose of admixture lime or acetylene slag is the same with moulded coal with family life in coal, also has been solid sulphur effect, reduces SO in the flue gas ₂Content.

Present method is manufactured moulded coal, because admixture adhesive special not, and the equal no adhesion of two kinds of atures of coal that cooperate, so will make the coal that looses be easy to press forming and reach the adhesion problem that certain intensity must be taked other measures solution materials after shaping.This measure is exactly the way that adopts the canebreak of water vapor heating and admixture sawdust, rice hulls and so on.Wherein coal blending pulverizing back is that generation cohesiveness in material surface creates conditions in the process for ature of coal is rolling stirring under the water vapor heating condition; The prior water steam heating of the canebreak of admixture is softened and rolled eliminating air wherein also is in order to make it have cohesiveness; Be stirred to the adding canebreak from ature of coal and roll, whole process all makes material be under the hot state, and the heavy oil temperature of sprinkling is also higher, and these measures all are to guarantee the required close-burning prerequisite of moulded coal coldmoulding.

The a certain proportion of heavy oil of admixture mainly is in order to make the moulded coal smooth surface after the shaping, to have waterproof effect in the technical scheme.Simultaneously also help to improve the volatile matter of moulded coal.

Adopt the moulded coal of the present invention's preparation, its basic mechanical design feature index: net calorific value is generally in 4500 kilojoules/more than the kilogram, the as analysed basis volatile matter is generally between 20-23%, ash content is generally about 33%, fixed carbon is more than 40%, and it is not broken that intensity can reach 1.5 meters of drop heights, and water-repellancy is to soak in the water not soften in 48 hours, be used for the burning industrial boiler, SO in the flue gas ₂Content burns the coal that looses and reduces more than 50%.Can replace the diffusing coal of bituminous coal fully and make industrial coal.

Embodiment:

Ratio batch mixing in 70 kilograms of hard coals, 30 kilograms of brown coal, 4 kilograms of limes, the ring crusher that has 5 millimeters sieve apertures bottom putting into is pulverized and is sieved, then undersize material is sent into the stirring system that the double-shaft mixers that is provided with steam jet by two tops, front and back forms and carried out continuously stirring, when stirring, the pressure that is produced by boiler is that the water vapor of 3-4 kilogram sprays in the material by jet pipe, through twice stirring, drop temperature can reach more than 50 ℃, makes material enter road roller compaction processes down under this temperature; Before this, sawdust is absorbed earlier pressure that boiler sends here in the bottom is connected with the cement pit of steam jet be that the water vapor of 3-4 kilogram softens, temperature can reach 70 ℃ after sawdust absorbed vapo(u)rous, at this moment it being sent into wet pan rolls separately about one minute earlier, mix and continue to roll 3 minutes with above-mentioned sawdust (closing 4 kilograms of dried sawdusts) after stirred materials is saturated with 12 kilograms by 100 kilograms of coals then, when rolling, the heavy oil that will be heated to 80 ℃ with oil pump is by 100 kilograms of coals, the ratio of 3 kilograms of heavy oil sprays into the material from the top, it is that 200 kilograms chilling press is pressed into 35 * 20 * 16 millimeters elliposoidal that material after rolling enters pressure immediately, becomes industrial shaping coal through the air seasoning.Through actual measurement, the volatilization of this moulded coal is divided into 20.63%, and ash content is 32.12%, and fixed carbon is 42.35%, and thermal value is 4800 kilojoule/kilograms.Burn through examination on 4 tons of hot water boiler for heating, state of combustion is good, and the ature of coal burning is fast, flame temperature height (1032 ℃); Slag carbon content 10.25% reduces by 37% than burning datong bitumite; Gaseous combustible thing utilization ratio improves 25% than datong bitumite; Boiler thermal output reaches 63.4%, improves 21.2%, 253.1 milligrams/mark of dust contained flue gas concentration rice ³, reduce nearly 50%, SO ₂Emission concentration is 6.72 kilograms of/ton coals, reduces greatly than the diffusing coal emission concentration (20 kilograms/ton more than the coal) in Datong District.

Claims (2)

1, a kind of hard coal that adopts is the method that main coal prepares industrial shaping coal, it is characterized in that, with the weight ratio coal blending of hard coal and brown coal by 7: 3, press the heavy 3-5% of coal and add lime or acetylene slag, through mechanical disintegration and screening, make its granularity below 5 millimeters, under the water vapor heating condition, stir then, its temperature of charge be not less than under 50 ℃ of states with weight be the heavy 3-5% of coal, carried out the water vapor thermoplastic in advance and rolled, its temperature is not less than 65 ℃ canebreak and mixes, continued to roll 8-10 minute, when rolling, be not less than 80 ℃ heavy oil, be cold-pressed into sphere after rolling immediately in the ratio spray temperature of the heavy 3-5% of coal.

As the said industrial shaping coal preparation method of claim 1, it is characterized in that 2, said canebreak is sawdust or rice hulls.