CN1038600C

CN1038600C - Binder and process for production of briquet for gasifing

Info

Publication number: CN1038600C
Application number: CN93101005A
Authority: CN
Inventors: 叶敬胜
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-01-14
Filing date: 1993-01-14
Publication date: 1998-06-03
Anticipated expiration: 2013-01-14
Also published as: CN1080316A

Abstract

The present invention relates to a gasified briquette binder and a production process of briquettes. The binder uses emulsified asphalt or sodium humate, coal tar, swell soil and biochemical sludge as raw material, and briquette (coke) with a performance superior to that of carbonized coal balls in fertilizer gas making can be obtained by the cold-pressing, the moulding, the natural drying or the baking of the binder and smokeless powdered coal (powdered coke). The binder has strong binding force, and can be pressed and moulded on pair-roller type briquetting machines. The obtained briquette has the advantages of good drop strength, abrasive resistance, compression strength and thermal stability, and is consistent with the requirements of fertilizer gas making to the briquette. Additionally, since the present invention does not need hot melt kneading and high-temperature post processing, investment can be saved.

Description

Binder and process for production of briquet for gasifing

The invention belongs to the coal powder formation technology.

At present, civilian and power briquette production mainly adopts pitch and coal tar wet goods to make binding agent, the moulded coal physical strength height that makes like this, water-tolerant, but because binding agent medium pitch and coal tar content height, incorporation in coal is big, and (coal tar pitch accounts for the 8-12% of fine coal weight, and petroleum pitch accounts for the 6.4-15% of fine coal weight, and coal tar accounts for the 1.6-8% of fine coal weight, fine coal and pitch need hot melt to mediate, need high temperature oxidation process after the moulding, it is higher to consume energy, and facility investment is big.

Gasification briquette uses the binding agent of slaked lime as anthracite fine coal now, passes to after the moulding to contain certain density CO ₂Gas, the Ca in the slaked lime (OH) at a certain temperature ₂With CO ₂Reaction forms the calcium carbonate crystal mesh skeleton, the anthracite fine coal briquetting is lived, make it become cold and hot intensity height, be applicable to the artificial lump coal of immovable bed coal seam stove gas making, its shortcoming is that lime adding amount big (account for fine coal weight 20%) has increased the ash of moulded coal, reduce moulded coal thermal value and fixed carbon content, thereby influenced gas forming amount.

The present invention aim to provide a kind ofly have that better cohesiveness, physical strength height, Heat stability is good, ash are low, fixed carbon content and thermal value height, gas forming amount are big, technology simply, does not need hot melt to mediate the organic and inorganic type combined gasification briquette binder and the briquette production technology that can reduce pitch and the coal tar consumption in fine coal (Jiao) again and can save facility investment.

A kind of adhesive for gasifying briquettes of the present invention comprises emulsified bitumen 10-20%, wilkinite 15-22%, coal tar 8-10%, biochemical sludge 4-10%, water 38-63%.Under normal temperature, normal pressure, in reactor 2, add wilkinite and water and stir into mobile well mud (A liquid).In addition under normal temperature, normal pressure, in reactor 1, with emulsified bitumen, biochemical sludge and coal tar stirring becoming uniform solution (B liquid).At normal temperature, normal pressure with under constantly stirring, B liquid is slowly added in the A liquid, make it become the emulsion that has good stability.Another kind of adhesive for gasifying briquettes comprises Sodium salts humic acids 10-20%, wilkinite 15-22%, coal tar 8-10%, biochemical sludge 4-10%, water 38-63%.Under normal temperature, normal pressure, in reactor 2, add wilkinite and water and stir into mobile well mud (A liquid).Under normal temperature, normal pressure, in reactor 1, with Sodium salts humic acids, biochemical sludge and coal tar stir becomes uniform solution (B liquid).At normal temperature, normal pressure with under constantly stirring, B liquid is slowly added in the A liquid, make it become the emulsion that has good stability.

Gasification briquette moulding process of the present invention, raw materials used is fine coal (comprising hard coal fine coal, brown coal fine coal, bituminous coal fine coal, coke breeze etc.), water content is less than 3%; Raw material granularity is less than 3mm, and wherein the pellet of 1-3mm accounts for 20-30%, accounts for 70-80% less than the pellet of 1mm, adhesive for gasifying briquettes is added to mix in the fine coal by the 11-25.5% of fine coal weight pinch, at 100-200kg/cm ²Pressure under compression moulding, and seasoning at normal temperatures or 105-110 ℃ of down oven dry.

Fig. 1 is this adhesive for gasifying briquettes technological process of production block schematic diagram.

Fig. 2 is this gasification briquette technological process of production block schematic diagram.

The present invention will be further described below in conjunction with Fig. 1, Fig. 2 and embodiment.

Embodiment 1:

In 54.6% water, add wilkinite 18.2%, stirred 15 minutes, make it become mobile well mud (A liquid).Under normal temperature, normal pressure, emulsified bitumen 13.6%, coal tar 9.1%, biochemical sludge 4.6% were stirred 10 minutes, make it become uniform solution (B liquid).Under constantly stirring, B liquid is slowly added A liquid, continue again after adding to stir 20 minutes, get this binding agent.

With Yunnan natural resources anthracite fine coal 1000 grams and adhesive for gasifying briquettes 110 grams, stir, at 200kg/cm ²Pressure under compression moulding.Through seasoning or 105-110 ℃ of oven dry down.This moulded coal ultimate compression strength 41.8-54.3kg/cm ², dropping strength (greater than 25mm) 87.9-89.3%, thermostability (greater than 25mm) 98.1-99.4%, porosity 9.7-15.6%, good waterproof performance, this moulded coal is soaked in the cold water about January not modification and collapses.

Embodiment 2:

In 47.1% water, add wilkinite 17.7%, stirred 15 minutes, make it become mobile well mud (A liquid).Under normal temperature, normal pressure, Sodium salts humic acids 15.7%, coal tar 9.8%, biochemical sludge 9.8% were stirred 10 minutes, make it become uniform solution (B liquid).Under constantly stirring, B liquid is slowly added A liquid, continue again after adding to stir 20 minutes, get this binding agent.

Stir with Kunming tripoly phosphate sodium STPP factory coke breeze 1000 grams and binding agent 255 grams, at 200kg/cm ²Compression moulding under the pressure is through seasoning or 105-110 ℃ of oven dry down.This moulded coal ultimate compression strength 56-69.9kg/cm ², dropping strength (＞25mm) 80.43%, and thermostability (＞25mm) 99.1%, non-watertight.

Embodiment 3:

In 49.3% water, slowly add wilkinite 17.8%, add the back and continue to stir 15 minutes, obtain mobile well mud (A liquid).Under normal temperature, normal pressure, add emulsified bitumen 15.1%, coal tar 9.6%, biochemical sludge 8.2% stirred 10 minutes, got (B liquid).Stirred 20 minutes B liquid slowly being added in the A liquid, this binding agent.

Divide batch mixing to pinch in proportion 5-7 minute with the about 25 tons of 4.6 tons of binding agents that make with above-mentioned binding agent composition, proportioning and making method of Nayong, Guizhou hard coal fine coal.With the pair roller type ball press coldmoulding of producing carbonated coal balls, seasoning or under 105-110 ℃ of temperature, dry, about 29.6 tons of moulded coal.

Be raw material now with Nayong, Guizhou hard coal, with carbonated coal balls with do a contrast with the physical and chemical index of coal briquette that the technology of the present invention is manufactured experimently, as shown in table 1: (table see afterwards civilian)

Annotate: the carbonated coal balls index is to add up year March in January, 1991 to 1992

Schwellenwert-maximum/mean value.

Use the present invention to be manufactured experimently coal briquette with Nayong, Guizhou hard coal by raw material, in the enterprising promoting the circulation of qi test of Φ 2260 fixed level gas cookers.The result is as shown in table 2 for its gas composition analysis:

Table 2

Time	Gaseous constituent (%)
	Gaseous constituent (%)					?CO ₂	??O ₂	??CO	??H ₂	??N ₂
	????8：00		??0.8			?CO ₂	??O ₂	??CO	??H ₂	??N ₂
????9：00	????8：00		??0.8				??0.7
????9：00	????10：00	??7.0	??0.7	??30.7	??45.6		??0.7				??16.2
????11：00	????10：00	??7.0	??0.7	??30.7	??45.6	??7.3	??0.5	??31.0	??41.3	??19.9	??16.2
????11：00	????12：00	??7.5	??0.5	??29.4	??46.1	??7.3	??0.5	??31.0	??41.3	??19.9	??16.5
????13：00	????12：00	??7.5	??0.5	??29.4	??46.1	??8.4	??0.5	??28.9	??42.2	??20.0	??16.5
????13：00	????14：00	??7.7	??0.5	??32.3	??44.6	??8.4	??0.5	??28.9	??42.2	??20.0	??14.9
????15：00	????14：00	??7.7	??0.5	??32.3	??44.6	??8.5	??0.5	??30.6	??43.0	??17.4	??14.9
????15：00	????16：00	??9.0	??0.6	??27.4	??43.2	??8.5	??0.5	??30.6	??43.0	??17.4	??19.8

Annotate: the former burning anthracite block coal of vapourizing furnace begins to add the present invention from 9:50 and manufactures experimently coal briquette.The working of a furnace is bad before adding coal briquette of the present invention, oxygen level height (0.7-0.8), and scabbing or wind-tunnel may appear in the stove in throat temperature higher (about 470 ℃).After adding the present invention manufactured experimently coal briquette, the working of a furnace took a turn for the better, and oxygen level reduces to 0.5, and throat temperature is reduced to 280-320 ℃.

Effect of the present invention is that the binding agent of gained has strong and other forming technique comparison of cohesiveness, and desired forming pressure is not high (to be 100-200kg/cm ²And the pressure＞300kg/cm of other moulding process regulation ²), even also can produce the higher coal briquette of intensity, and first intensity height with the pair roller type ball press of small fertilizer plant's original production carbonated coal balls, just the coal briquette of demoulding highly falls 1-2 time from 1-2 rice and does not destroy, and is convenient to the back operation and transmits.In addition, mix pinch preceding, mix and need not heat treated when pinching, also need not high temperature oxidation process after the moulding, therefore capable of reducing energy consumption.But seasoning under the situation of place permission., can make to Tumble Dry when limited in the place.Gained moulded coal physical strength height, Heat stability is good, fixed carbon content height, gas forming amount are big.

This moulded coal production technique and carbonated coal balls production technique are relatively, Production Flow Chart is brief, facility investment is few (saving carbonization workshop factory building and the facility investment of carbonization jar), also can on the basis of original carbonated coal balls production plant, transform a little and just can satisfy the needs of producing moulded coal with this binding agent and briquette production technology.

From table 1, table 2 as can be seen, joined coal tar and emulsified bitumen owing to mix in the binding agent, so moulded coal has excellent waterproofness, suitable long-distance transport, but coal tar and the emulsified bitumen consumption in moulded coal is lower, and gas making is significantly increased with anthracitic volatile matter.Coal briquette has withstood dynamically test such as furnace high-temperature, high carbon-coating, gas shock, ash-pan rotation, and produces qualified coal gas, therefore, can replace anthracite block coal, lump coke and carbonated coal balls to produce synthetic ammonia.

Table 1:

Continuous table 1

Cold strength	Ultimate compression strength (the single ball of kg/)	-	????48.9	????57.1
	Ultimate compression strength (the single ball of kg/)	-	????48.9	????57.1	Dropping strength (＞25mm, %)	-	????25.78-79.31 ????46.38	????94.45
	Abrasive wear resistance (＞25mm, %)	-	????53.1	????85.5	Dropping strength (＞25mm, %)	-	????25.78-79.31 ????46.38	????94.45
	Abrasive wear resistance (＞25mm, %)	-	????53.1	????85.5	Thermostability (＞25mm, %)		-	????86.0	????99.5
Porosity (%)	850 ℃ of calcinations 30 minutes	-	????34.7	????33.5	Thermostability (＞25mm, %)		-	????86.0	????99.5
	850 ℃ of calcinations 30 minutes	-	????34.7	????33.5	105 ℃ of oven dry are more than 2 hours	-	????21.7	????9.1

Claims

1. an adhesive for gasifying briquettes is characterized in that it consists of emulsified bitumen 10-20%, wilkinite 15-22%, coal tar 8-10%, biochemical sludge 4-10%, water 38-63%.

2. connect the manufacture method of the described adhesive for gasifying briquettes of claim 1, it is characterized in that:

A) under normal temperature, normal pressure, in reactor, add wilkinite and water, stir into the good mud of mobile root (A liquid);

B) under normal temperature, normal pressure, with emulsified bitumen, biochemical sludge and coal tar stirring becoming uniform solution (B liquid).

3. by the manufacture method of the described adhesive for gasifying briquettes of claim 2, it is characterized in that under normal temperature, normal pressure and continuous the stirring, B liquid slowly being added in the A liquid, make it become the emulsion that has good stability.

4 one kinds of adhesive for gasifying briquettes, its feature consist of Sodium salts humic acids 10-20%, wilkinite 15-22%, coal tar 8-10%, biochemical sludge 4-10%, water 38-63% doing it.

5. by the manufacture method of the described adhesive for gasifying briquettes of claim 4, it is characterized in that:

A) under normal temperature, normal pressure, in reactor, add wilkinite and water, stir into mobile well mud (A) liquid;

B) under normal temperature, temperature and pressure, with Sodium salts humic acids, biochemical sludge and coal tar stirring becoming uniform solution (B liquid).

6. by the manufacture method of the described adhesive for gasifying briquettes of claim 5, it is characterized in that under normal temperature, normal pressure and continuous the stirring, B liquid slowly being added in the A liquid, make it become the emulsion that has good stability.

7. as claim 1, the purposes of 4 described adhesive for gasifying briquettes is characterized in that described adhesive for gasifying briquettes is added mixed pinching in the coal dust by 11-25.5% of anthracite fine coal (or coke breeze) weight, and the preparation gasification briquette is at 100-200kg/cm ²Pressure under compression moulding, and seasoning or 105-110 ℃ of down oven dry under the normal temperature.