Powder-coal fuel and method thereof

 

(57) Abstract:

The invention relates to the technology of solid fuel for combustion in a combustion device, in metallurgical processes, in the production of alumina, limestone, lime, cement, brick, using oil, water, masulipatnam slurries, or powdered coal. The fuel comprises coal, crushed to a particle size of 0-1 mm, hydrocarbons and water vapor in their mass ratio 0,74:0,11:0,15-0,84:0,15:0,01 when the content of fractions of coal 0-74 μm, equal to 5.4%. Fuel receive simultaneous grinding and mixing the fine fractions of coal with a hydrocarbon in the presence of water vapor at above their mass ratio. Content in milling fractions of coal 0-74 μm is not less than 70%. The invention allows to obtain non-dusting explosion-proof solid coal fuel in the form of powders: powder odonatologica fuel (PWMOUT), which does not form arches during storage, granular and easily transported by pneumotropica for atomization and mixing with air. 2 S. and 1 C.p. f-crystals, 1 Il., table 2.

The invention relates to the technology for solid fuel before combustion, in particular to obtain the top is linsey, clay, lime, cement, brick, using oil, water, masulipatnam slurries, or powdered coal

A method of obtaining powder-coal fuel SU 684251, With 10 L 9/00, 05.09.1979 [1], which consists in the simultaneous grinding and mixing the fine fraction of coal with liquid combustible substances. Used flammable substances may contain up to 20% water. The disadvantage of this method is the explosion process, since the use of the watered to 20% of the liquid combustible substance by grinding together with coal does not preclude the formation of explosive fine fractions of coal.

Also known to produce brown coal dust on Nazarovo GRES (Filippov Century A. "drying Technology and thermoelasticity coals", M, "Nedra", 1987, 284 S.) [2]. Raw coal Nazarovo of the section is split up sizes less than 20 mm, R10=5% Coal with initial moisture 36-39% dried to a residual moisture content of 14-16% in tubular dryers, heated steam with a pressure of 0.36-to 0.80 MPa at 140-170oC. Susanka goes on pneumotussin closer to the boilers, where it is ground in a hammer mill equipped with a ventilation system. Scheme ventilation grinding tamcn is 20% of the agent in each cycle is extracted from a special fan on a separate group of cyclones, then passes the wet dust collector and discharged into the atmosphere. The dust is fed into the intermediate hopper of the boiler. From his pipe-line to the burning device. The transport of dust is offline compressed air with a pressure of 0.05 MPa.

The disadvantages implemented method of obtaining coal dust include: the complexity of the technological chain, dust, jobs, explosiveness, bridging in the hopper received dust, large production facilities for equipment mounting and high initial capex.

A method of obtaining powder-coal fuel (K. Kegel. "Briquetting of lignite". - M.: "Whiteheat", 1957) [3], including the processing of fine fractions of coal with spray steam to ensure explosion processes. In this embodiment discusses the impact of the steam as an inert substance that reduces the percentage of oxygen in the working area of the processing of coal, but not studied the effect of joint action of steam and hydrocarbons. The process uses one pair of non-hydrocarbons.

Closest to the proposed entity and the achieved result is a powdered-coal hoplocarida and water vapor. The quantity of hydrocarbons is 5-10 wt. % (based on coal dust, and the amount of steam 1-3 tons per 1 ton of dust. A disadvantage of the proposed fuel of this composition is that in the preparation of powdered-coal fuel at a known patent [4] is dusty fuel. This arises due to the fact that by reducing the consumption of hydrocarbons below 11% broken process complete coagulation fine dusting of coal particles and binding them into a larger non-dusting particles. The resulting fuel is still dusting and increase the flow of steam leads to technologically unjustified, excessive flooding of the fuel and reduce its calorific value, which increases operating costs to the consumer.

The present invention is to obtain a non-dusting solid coal fuel in the form of powders: powder odonatologica fuel (PWMOUT), which does not form arches during storage, granular and easily transported by pneumotussin to the nozzles for atomization and mixing with air.

This is achieved by obtaining from coal fuel products of a certain material and particle size distribution. The specific surface of PII. It should be noted that this contributes to reducing the chemical activity of the surface of the coal in the interaction with oxygen and increase in duration of storage of powder to spontaneous combustion. The surface of the coal is passivated by antioxidants. As an antioxidant use non-polar (oil) coagulants, for example, hydrocarbon oils with water. Received fuel product and composition PWMOUT includes natural transition States coal as a result of exposure coagulants - antioxidants.

The implementation of the present invention can be illustrated by the drawing, which presents a histogram vodonapornogo fuel in various States. Position in the drawing denote: 1 - transitional state, 2 - PWMOUT, 3 - natural state.

As can be seen, the state coal powder, wetted with a film of heavy hydrocarbons and water (in this case steam), losing in proforest, is the object of special attention.

As a result of mixing pulverized coal with coagulant - antioxidant forms a disperse system in the form of non-dusting carbon powder (see drawing, the area of the histogram 2) that in an industrial environment has a number on the>- fire and explosion due to a decrease of the specific surface and passivation of coal (coagulation of submicron particles);

- reduction of dust when grinding coal and pneumo transporting powder;

- flowability required for the transport of fuel pipes and spray in a burning torch.

The advantage of the proposed method lies in the simplicity of the technological organization of production of the fuel product that does not require the installation of additional dust and cleaning systems. In the process of coagulation hazardous fine particles of coal (microniche) not present in the environment, which can be seen from comparative granulometric characteristics of the coal powders obtained by the present method and the baseline scenario (table. 1).

In the coal powder is not pilit, easy atomservice through the nozzle of the device under the action of the air flow supplied to the combustion of fuel. The powder is stable during storage is not deformed in the bunker and not turn into a paste or cake on the bottom of the hopper. Powder burns well with the maximum use of the calorific value of coal. Available in powder water due to higher than that of air, t is the powder, increase the completeness of the combustion of coal and fuel oil due to their more complete atomization in an environment sufficiently heated secondary air torch more stretched along the length of the furnace, than when burning fuel oil or dry dust-like fuels, contributes to improvement of technological process of burning cement clinker, clay powder or alumina cake.

Modes sintering and firing softer, stretched in time. Particularly favorable offer powder during sintering of alumina. Reduces the risk of melting of the charge on the border of the marginal productivity of the furnace.

Fuel powder is prepared as follows. Coal is used, for example, the Kansk-Achinsk basin with a specific heat of combustion 3740-3800 kcal/kg (15,69-15,90 MJ/kg) or bertinat, which are crushed to a particle size of 5-6 mm Crushed coal serves, for example, in a ball mill and milled to a particle size of 0-1 mm (contents faction 0-74 μm is not less than 70-80%). At the same time in the mill feed steam when 135-170oC and 0.3-0.8 MPa and antioxidants at the same pressure and 70-90oWith contributing fine atomization.

Steam provides the explosion process and vvedeniem. Steam is supplied in an amount not less than 15-20% of the weight mass of the antioxidant. As an antioxidant use hydrocarbon oils, such as fuel oil. According to the table. 2 select the weight ratio of the input components: coal:fuel oil:steam.

As can be seen from the above data, when the ratios in sadomasochism fuel equal to coal:fuel oil:steam=0,74:0,11:0,15-0,84:0,15:0,01, it turns out the loose powder-coal fuel.

EXAMPLE. Coal, crushed to a particle size of 5-6 mm, is loaded into a ball mill at the rate of 10 t/h, where 70oServed with oil at a flow rate 1807 kg/h, respecively steam at a pressure of 0.4-0.5 MPa with a temperature of 135-155oC. the steam Flow rate is 240 kg/h In the grinding obtain powders with a mass fraction of components according to the table. 2.

Sources of information

1. Inventor's certificate SU 684251, C 10 L 9/00. 05.09.1979.

2. Filippov Century A. "drying Technology and thermoelasticity coals". - M. : Nedra, 1987, 284 S.

3. K. Kegel. "Briquetting of lignite". - M.: "Whiteheat", 1957, S. 526.

4. Patent DE 210598 I 24.06.76. C 10 L 5/16, 5/22 (prototype).

1. Powder-carbon fuels, including coal, crushed to a particle size of 0-1 mm, hydrocarbons and water vapor, O1: 0,15-0,84: 0,15: 0,01, when the content of fractions of coal 0-74 μm, equal to 5.4%.

2. A method for producing powder-coal fuel, including simultaneous grinding and mixing of the fine fractions of coal with a hydrocarbon, wherein the process is conducted in the presence of water vapor at the following mass ratio of coal: hydrocarbons: steam= 0,74: 0,11: 0,15-0,84: 0,15: 0,01 and content when grinding faction coal 0-74 μm is not less than 70%.

3. The method according to p. 2, characterized in that the hydrocarbons used oil, oil, process fuel, diesel fuel, gas oil, tar coal processing.

 

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Fuel briquette // 2163252
The invention relates to fuel briquettes, which can be used as fuel in households, boilers, household use, furnaces rail cars, as well as an ignition means for igniting the

FIELD: solid fuels.

SUBSTANCE: invention relates to fabrication of hydrocarbon moldings in the form of briquettes or granules. Which can be used as natural solid fuel substitutes for municipal and industrial needs but also as fertilizers and/or soil structure improvers. Carbon-containing moldings contain (i) ground peat and/or lignin (5-50%), (ii) wood-vegetable components in the form of sawdust and/or wood chips, and/or bark, and/or straw, and/or chaff, and/or seed shells, and/or oilcake, and/or plant stems and leaves, and/or animal components in the form of poultry dung and/or manure (1-10%), and (iii) binder in the form of burnt lime, sodium hydroxide, or potassium hydroxide (balancing amount). Method of fabrication comprises dispensing, mixing, grinding, and activation of peat and/or lignin with binder, after which is added above-indicated wood-vegetable and/or animal components and resulting mixture is remixed. Final mixture is converted into moldings, which are then compacted by lying during 2 to 30 h.

EFFECT: extended consumer's market of low-cost and environmentally safe fuel product, enabled utilization of wide range of energy organic wastes, and improved fertility of soil.

6 cl, 9 ex

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