CN1042328A

CN1042328A - Utilize the method for industrial slags production of shaped coal

Info

Publication number: CN1042328A
Application number: CN 89108057
Authority: CN
Inventors: 张建平; 刘学智
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-10-31
Filing date: 1989-10-31
Publication date: 1990-05-23

Abstract

Utilize the method for industrial slags production of shaped coal to relate to the industrial process that a kind of slag that contains carbon that does not burnout safely that utilizes Industrial Boiler to discharge is made moulded coal (as honeycomb briquette).The invention solves the technical problem that the carbon in the slag is difficult for lighting, reached processing waste residue protection environment, the purpose of saving coal.The present invention utilizes phosphorus content to be the slag, raw coal, clay more than 20% and to be raw material by the additive that calcium hydroxide and potassium permanganate are formed, and makes moulded coal after pulverizing, stirring, moulding and drying, and the present invention is applied to the comprehensive utilization aspect of industrial slags.

Description

Utilize the method for industrial slags production of shaped coal

The present invention relates to a kind of slag that contains carbon that does not burnout fully that utilizes Industrial Boiler to discharge and make the production method of beehive coal ball.

The existing Industrial Boiler (as the Industrial Boiler of power plant and central heating) that burns coal all gives off a large amount of slags every day, these slags are not grilled thoroughly fully, also contain a large amount of carbon in the slag, these slags are taken as waste residue and outwell, cause environmental disruption on the one hand, cause the waste of the energy on the other hand.China has in the boiler slag of considerable middle-size and small-size thermal power plant discharge now, and phosphorus content reaches 30%-60%.Through the carbon in the slag after the primary combustion is a kind of highly stable and pure carbon granules, and it has and is difficult for lighting.It is long to light the after-combustion time.The characteristics that caloric value is big.Up to the present, also there is not a kind of commercial run that effectively utilizes the carbon do burning in the industrial slags.The method of making honeycomb briquette or coal briquette now is with the raw coal pulverizing, to add clay and stir moulding then, drying as adhesive.

The object of the present invention is to provide a kind of carbon containing that utilizes to make the production method of moulded coal at the industrial slags below 20%.

Technical measures of the present invention need be finished altogether by following, raw meal is broken into powder, then each raw material is stirred, moulding, drying, its special character is: raw material is made up of at the slag more than 20%, raw coal, clay with by the additive that calcium hydroxide and potassium permanganate are formed phosphorus content.

According to technical measures of the present invention, the optimal proportion of flyash (pulverizing the back by slag forms), coal dust (pulverizing the back by raw coal forms), clay, additive and water is as follows:

Fly ash carbon content	The fine coal outstanding person	The raw coal coal dust	Clay	Additive	Water
						27－35％	35％	35％	30％	0.2％	10-13％
35-45％	40％	30％	30％	0.2％	10-13％
						45-60％	50％	20％	30％	0.2％	10-13％

The ratio of potassium permanganate is not less than 0.5% of calcium hydroxide weight in the additive, the stirring of pulverizing each raw material of back is that elder generation stirs flyash and clay, adds coal dust then and stirs in proper order, add by additive again and pour the solution that the back that stirs in the water forms into, powdering stirs.

In said method, the additive role is combustion-supporting.If not doping in the coal type combustion process of making, at first is that wherein raw coal is by ignition combustion, after the level, the carbon in the flyash makes coal light slowly just by ignition combustion like this when raw coal has burnt one section, burning velocity is slow, also is unfavorable for the completing combustion of coal.After in moulded coal, adding additive, the ignition temperature that raw coal is lighted the back generation at first makes the potassium permanganate in the additive decompose, emit oxygen, under the effect of oxygen, raw coal burns rapidly, furnace temperature is improved, under higher furnace temperature, calcium hydroxide decomposes, and emits oxygen and hydrogen, further promote burning again, the carbon in the flyash is ignited.Shorten the duration of ignition like this, improved burning velocity.

Carry out the stirring of raw material according to the method described above, help shortening and light the phase.Earlier flyash and clay are stirred, clay is dispersed in around the flyash as adhesive, after adding the raw coal coal dust, coal dust is clung around the fine coal meeting by clay, add like this and form one to be equivalent to the center be flyash, clay is in the centre, and raw coal is at outer field orbicule, can guarantee that raw coal is lighted earlier in the moulded coal burning.

The present invention has obtained following good effect:

1, saves coal, reduced energy waste.The slag of pressing carbon containing 27% calculates, and the addition of flyash and raw coal is each half, can economize on coal 50%.

2, slag has been carried out utilizing again, helped environmental protection.

3, since the carbon in the flyash to have a burning time long, the characteristics that caloric value is big are so it can burn half an hour than the general onesize honeycomb briquette of being made by raw coal more.

4, owing to reduced the raw coal consumption, the cost of moulded coal is low, and price also can reduce, and has obvious social and economic benefit.

The present invention will be described in further detail in the concrete enforcement below.

Concrete implementing process of the present invention is as follows:

1, raw material is screened and pulverizes.

At first raw coal and slag were screened before pulverizing, with bigger the selecting of piece, this will help pulverizing.Raw coal that will sieve and slag are pulverized then, and the maximum particle size diameter preferably is not more than 3 millimeters after the raw material pulverizing, after the pulverizing, can screen again.Slag will select for use carbon containing at the slag more than 20%, and slag also can be that carbon containing is at the chimney soot more than 20%.Slag becomes flyash after pulverizing and screening.Raw material also has clay, calcium hydroxide and potassium permanganate except raw coal and slag, these raw materials generally need not screen, pulverize.

2, each raw material is carried out batching.

Sum total with flyash, raw coal coal dust and clay is 100 calculating, and the ratio that the clay amount accounts for 30% flyash and raw coal coal dust decides according to phosphorus content in the coal ash.The best proportioning of each raw material sees the following form.

Fly ash carbon content	Flyash	Raw coal	Clay	Additive	Water
						27－35％	35％	35％	30％	0.2％	10-13％
35－45％	40％	30％	30％	0.2％	10-13％
						45－60％	50％	20％	30％	0.2％	10-13％

The addition of additive and water is a flyash, 0.2% and 10-13% of raw coal coal dust and clay total amount, additive is made up of calcium hydroxide and potassium permanganate, and the amount of potassium permanganate preferably is not less than 0.5% of calcium hydroxide weight, for through practicality, optional with calcium carbide (calcium carbide CaC ₂) water residue calcium hydroxide after the meeting.

3, raw material is measured after, mix stirring.Earlier flyash and clay are stirred; adding the raw coal coal dust then stirs; additive poured in the water be sprayed at after stirring on the homogeneous mixture that flyash, clay and raw coal coal dust constitute, stir simultaneously, reach at last that particle mixes, moisture content is evenly distributed.

4, compacting

Because the material that flyash is a kind of light weight, density is little, the raw material after the stirring are the empty loose condition (of surface) of paulin, if enter make-up machine presswork at this point, will cause the feeding deficiency, make moulded coal because of density is difficult to stack inadequately, also can reduce burning time.For this reason, before moulding, give certain weight stirring the raw material of mixing and stirring, increase density.Need altogether by this road of compacting, can utilize existing forming machine, as honeycomb briquet making making machine.Certainly, if improve forming machine according to the material density before the compacting, make the moulded coal after the moulding reach certain density, also can cancel this road of compacting needs altogether.

5, moulding

Raw material after the compacting sent into carry out moulding in the make-up machine, make moulded coal, for example make honeycomb briquette.

6, drying

Moulded coal after the moulding just is generally also too hard, and is broken easily, so will carry out drying after the moulding.The simplest drying means is air dry, as is placed in the warehouse of open-air or ventilation.Get final product warehouse entry and piling after the drying.

When the phosphorus content of flyash during at 20-26%, still can produce moulded coal with said method, but the time raw coal addition increase, the slag consumption reduces.At this moment the ratio of flyash is 30%, and the ratio of raw coal is 40%, and its surplus is constant.By the moulded coal that this prescription is produced, caloric value is constant substantially, and slightly descend burning time, and the utilization of slag descends, but still can use.

Increase the ratio of potassium permanganate in the additive, can be higher than 0.5%, this helps the moulded coal burning, but cost increases.

Calcium hydroxide in the additive plays combustion-supporting effect.After calcium hydroxide at high temperature decomposed, hydrogen and oxygen had played combustion-supporting effect and have consumed, and the sulphur of calcium and clay and silicon react and generates calcium sulfide and calcium silicates, and these two kinds of materials help slagging scorification, and the slag of being tied was both not really hard, and was also not really soft, and moulded coal is better used.Simultaneously,, form calcium sulfide, played solid sulphur effect, reduced the pollution of sulfide air because calcium and sulphur react.But if the amount of calcium hydroxide increases, for example the consumption of additive surpasses 1%, though help burning, because decomposing the back, calcium hydroxide produces too much calcium, will generate calcium oxide, calcium oxide has destroyed the slagging scorification of moulded coal, and the fire that collapses easily makes the moulded coal bad use that becomes.

Claims

1, a kind of method of utilizing the industrial slags production of shaped coal, its step has, raw meal is broken into powder, then each raw material is stirred, moulding, dry, it is characterized in that: raw material by phosphorus content at the slag more than 20%, raw coal, clay and form by the additive that calcium hydroxide and potassium permanganate are formed, wherein clay comprises 30%, slag and raw coal sum point 70%, phosphorus content in the slag and raw coal weight sum account for slag and more than 42.5% of raw coal weight sum, and additive is no more than slag, 1% of raw coal and the heavy sum of clay, the content of potassium permanganate is not less than 0.5% of calcium hydroxide weight in the additive.

2, according to the described method of utilizing the industrial slags production of shaped coal of claim 1, it is characterized in that: the best proportioning of slag and raw coal is, when boiler slag carbon content during at 27-35%, slag and raw coal respectively account for 35%; When boiler slag carbon content during at 35-45%, the ratio of potassium permanganate is not less than 0.5% of calcium hydroxide weight in slag and the additive.

3, according to claim 1 or the 2 described methods of utilizing the industrial slags production of shaped coal, it is characterized in that: the order of stirring is, the flyash and the clay that will form after will being pulverized by slag earlier stir, adding coal dust then stirs, add by additive again and pour the solution that the back that stirs in the water forms into, powdering stirs.