CN1323144C

CN1323144C - Process for producing gasification briquette

Info

Publication number: CN1323144C
Application number: CNB2005100107207A
Authority: CN
Inventors: 张时能
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-03-31
Filing date: 2005-03-31
Publication date: 2007-06-27
Anticipated expiration: 2025-03-31
Also published as: CN1693432A

Abstract

The present invention relates to a process for producing gasification briquettes. Elasticity needs thoroughly eliminating during the forming processing period according to the forming mechanism of smokeless powder coal that most of the surfaces of the smokeless coal particles are rough and have strong surface elasticity. Raw material coal needs sufficiently mixing, stirring, twisting and rolling under the conditions that adhesive agents and water can be used, which eliminates the surface elasticity of coal particles and makes the adhesive agents effectively infiltrate into the surfaces of the coal particles. A briquette forming machine is used for forming the materials into a (green ball) shape by cold pressing, high quality briquettes can be made by that the made briquettes are dried in a drying kiln. The technical indexes of the briquettes of the present invention fit the China's stand GB7561-87 of gasifying briquettes of synthetic ammonia and the China's national stand GB9143-88 of the coal using stand of a normal pressure fixed bed gas generator, and also achieves the quality standard of gasified coal briquettes of China's state key task 95. The heat stability of the briquettes and the gasifying activity are good.

Description

A kind of production method of gasification briquette

Technical field

The present invention relates to the coal processing technique field, specifically a kind of production method of gasification briquette.

Background technology

Gasification briquette is meant and will be fit to the hard coal fine coal that synthetic ammonia system gas is produced, adding additives and suitable quantity of water, and by rational production technique and equipment, processing becomes gasification briquette (coal briquette).Gasification briquette is used for ammonia stove system semi-water gas, also can be used for other industrial gas stove manufacture fuel gas.

It is raw material with soil Jiao and lump coal that the large, medium and small synthesis ammonia plant of China is produced synthetic ammonia many, coke making by indigenous methods, and waste resource, contaminate environment, country firmly bans.Firmly ban under the coke making by indigenous methods situation in country, coke price soars, the hard coal lump coal price that can be used for Ammonia Production also soars, because in the hard coal exploitation, has only the lump coal about 25%, become the important topic that large, medium and small ammonia synthesizing industry carries out the raw material route transformation so utilize hard coal fine coal formation producing gas to produce synthetic ammonia, only large, medium and small synthesis ammonia plant year reaches more than 250 ten thousand tons, then several ten million tons in the whole nation with the burnt chemical fertilizer of producing of soil to our province in the past.More domestic briquette production processing, how with binding agent simple with fine coal mixing and water adding, compression moulding oven dry, but processing mechanism is lacked further investigation, thereby can not design advanced person, the suitable technological process of production and the processing technology of science.

Summary of the invention

The production method that the purpose of this invention is to provide a kind of gasification briquette, it utilizes the anthracite fine coal formation producing gas, not only can solve the problem of briquet replacing coke, and can reduce production costs significantly, makes ammonia synthesizing industry dynamic in market competition.

The present invention has conscientiously studied the mechanism of anthracite fine coal moulding: the hard coal particle surface mostly is coarse rough, and surface elasticity is big, and molding process must thoroughly be eliminated this elasticity.So design of gasification briquette production technique and processing technology, must under the condition that binding agent and water are arranged, fully feed coal be mixed, stir, rub with the hands and grind, eliminate coal grain surface elasticity, make binding agent effectively soak into coal grain surface, adopt ball press to be cold-pressed into (green-ball) type, green-ball drying kiln drying more just can make the high-quality coal briquette.

Concrete production method of the present invention is:

1) feed coal is selected: the raw material hard coal generally selects fixed carbon content to reach high-quality anthracite more than 68%, and sulfur-bearing is low, and fugitive constituent is low;

2) anthracite fine coal is removed lump coal through vibratory screening apparatus, and lump coal directly send Gas-making Furnace system gas, and fine coal send the vertical crushing crusher machine;

3) fine coal is crushed to below the Φ 3mm through the two-stage fragmentation, sends into the fine coal hopper through conveyor;

4) fine coal comes out from hopper, claims metering through speed-governing belt, send biaxial rneader A (the metering purpose is to add binding agent in proportion for following operation) through conveyor;

5) claim metering with binding agent by speed-governing belt, send into biaxial rneader A and mix that the caking agent add-on is 7～8% of a fine coal with fine coal;

6) in fine coal that is mixed in proportion and binding agent, add water, add water management, make coal dust, binding agent and water thorough mixing even in 9～13% of total amount;

7) compound that comes out in the biaxial rneader A enters biaxial rneader B, and in biaxial rneader B, not only thorough mixing stirs, and rubs stone roller simultaneously with the hands, to eliminate coal grain surface elasticity;

8) in order thoroughly to eliminate the coal charge surface elasticity, by the raw material that biaxial rneader B comes out, send into vertical puy processing through conveyor, compound is kneaded, rubs with the hands stone roller here repeatedly, the stranding stone roller time should be no less than 6 minutes;

9) the mixing crumb structure material that comes out from vertical puy is sent into homogenizer through conveyor, and the blade of homogenizer high speed rotation breaks into powdery with the crumb structure material, is convenient to enter the ball press pressure ball;

10) powder that comes out from homogenizer enters the ball press pressure ball and extrudes green-ball (ball press need be debug whole motor, extrudes green-ball to guarantee high quality), and the green-ball balling ratio can reach more than 95%;

11) green-ball that comes out from ball press (common intensity can reach 5～18 kilograms of/balls), green-ball is sent into drying kiln through conveyor.

12) the design inlet temperature of drying kiln is 170～185 ℃, 120～135 ℃ of medium temperatures, temperature out≤80 ℃, coal briquette is from the import to the outlet, drying time 2～2.5 hours, product coal briquette water content is gone into stockyard or is directly sent into Gas-making Furnace production system gas from the product coal briquette that drying kiln comes out below 1.5%.

The coal briquette cold strength of producing can reach about 70 kilograms of/balls, and hot strength can reach 30～40 kilograms of/balls, good stability.

Above whole process of production all is by a master control room operate continuously.Industrial scale can be according to each enterprise's needs, can be designed to 30,000 tons/year, 50,000 tons/year, 100,000 tons/year, and maximum-norm is 100,000 tons of/year gasification of coal ball production lines.

Method of the present invention is a kind of science, advanced anthracite fine coal forming process production technology, this technology can be applied to greatly, in, in the little ammonia enterprise, in the experimental study of the present invention, utilize Yunnan natural resources hard coal, Guizhou hard coal even send the Shanxi hard coal outside the province here and carry out repetition test, the gasification coal briquette that proof adopts gasification coal briquette production technology of the present invention to produce, through big, in, little ammonia stove system gas, the shaped coal technology index meets national GB7561-87 synthetic ammonia gasification coal briquette standard, GB9143-88 atmospheric fixed bed gas-producer coal standard, also reached country " 95 " tackling key problem gasification briquette quality standard, the coal briquette Heat stability is good, gasification reactivity is good.

Description of drawings

Fig. 1 is gasification briquette technological process of production figure of the present invention.

Embodiment

Embodiment: as shown in Figure 1, the method for producing the gasification coal briquette according to the following steps:

1) feed coal is selected: generally select the high-quality anthracite that fixed carbon content reaches more than 68%, sulfur-bearing is low, fugitive constituent is low;

5) claim metering with binding agent by speed-governing belt, binding agent is sent binding agent into biaxial rneader A and is mixed with fine coal with " rising sun light board compound binding agent " (Xuguang Energy Saving Co Ltd, Yunnan's product), and the caking agent add-on is 7～8% of a coal amount;

6) add water in fine coal that is mixed in proportion and binding agent, amount of water is controlled at 9～13% of fine coal and binding agent total amount, makes coal dust, binding agent and water thorough mixing even;

The equipment that uses has that vibratory screening apparatus, composite vertical crusher, speed-governing belt claim, biaxial rneader, vertical puy, homogenizer, ball press and drying kiln etc.

Claims

1. the production method of a gasification briquette is characterized in that producing according to the following steps:

1) selecting the high-quality anthracite that fixed carbon content reaches more than 68%, sulfur-bearing is low, fugitive constituent is low is raw material;

3) fine coal is crushed to below the ￠ 3mm through the two-stage fragmentation, through conveyor fine coal is delivered to hopper;

4) fine coal comes out to claim metering from hopper, send biaxial rneader A through conveyor;

5) binding agent is measured by title, send into biaxial rneader A and mix with fine coal, the caking agent add-on is 7～8% of a fine coal;

7) compound that comes out in the biaxial rneader A enters biaxial rneader B, and thorough mixing stirs in biaxial rneader B, rubs stone roller simultaneously with the hands, to eliminate coal grain surface elasticity;

8) raw material that is come out by biaxial rneader B is sent into vertical puy processing through conveyor, and compound is kneaded, rubs with the hands stone roller repeatedly, and the stranding stone roller time should be no less than 6 minutes;

9) the mixing crumb structure material that comes out from vertical puy is sent into homogenizer through conveyor, and the blade of homogenizer high speed rotation breaks into powdery with the crumb structure material;

10) powder that comes out from homogenizer enters the ball press pressure ball and extrudes green-ball;

11) green-ball that comes out from ball press is sent into drying kiln through conveyor;