RU120648U1 - TECHNOLOGICAL COMPLEX FOR COAL PROCESSING - Google Patents

Abstract

A technological complex for the processing of coal, including a coal preparation plant that produces concentrate, rock, middlings and coal sludge, an installation for the preparation of a coal-water slurry (VUS) from coal sludge, a station with boilers for obtaining heat and (or) electric energy, characterized in that the preparation installation The water-water slurry is additionally equipped with sections for fine crushing of middlings and wet grinding and mixing of finely crushed middlings and coal-water slurry, and the station is equipped with boilers for co-incinerating the water-slurry and crushed middlings.

Description

The utility model relates to technological complexes for coal processing, including crushing and beneficiation of coal, production of thermal and (or) electric energy. The utility model can be used in the reconstruction of old and construction of new technological complexes for coal processing.

Known methods of processing energy and coking coal, [1. Coal beneficiation guide. I.S. Blagov, A.M. Kotkin, L.S. Zarubin. M .: Nedra, 1984, pp. 59-69], according to which coal from mines and open pits is subjected to preliminary crushing and wet dressing to produce commercial products of concentrate and industrial products, as well as the release of rock and coal sludge. At the same time, energy concentrate, as well as intermediate products of energy and coking coals, as a rule, are sent for combustion to obtain thermal and (or) electric energy, coking coal concentrate is sent to receive coke, and coal sludge partially sits on the concentrate depending on ash and humidity or industrial product, and for the most part sent to dumps along with the breed.

The disadvantages of this processing method is:

- significant irretrievable losses of the combustible mass of coal with coal sludge (the coefficient of use of the combustible mass of coal does not exceed 80%);

- environmental pollution in the area of mining and processing enterprises due to weathering of small classes of coal from coal sludge stored on rock dumps and flushing of coal sludge particles with chemical reagents adsorbed on their surface (flocculants, coagulants, etc.) into nearby water bodies and depressions by rain and torrential streams, as well as melting snow streams.

Of the known technical solutions, the closest to the claimed device in technical essence and the achieved result, selected as a prototype, is a technological complex for coal processing [2. RF patent for utility model No. 57279 dated 06/29/2006]. The complex includes an installation for crushing and beneficiating coal to produce concentrate, rock and coal sludge, a station with boiler units for receiving thermal and (or) electric energy, operating on a coal-water slurry (WCS), obtained on the basis of coal sludge.

The disadvantages of this complex are:

- the inability to control the quality of the resulting water-coal suspension by ash content and the mass fraction of the solid phase, sent as fuel for combustion in the boilers of the station;

- the inability to control the particle size distribution of coal particles in the resulting water-coal suspension;

- low efficiency of the boilers at the HPS due to the low quality of the fuel and the inability to supply additional fuel in the form of crushed industrial product or coal.

The objective of the utility model is to eliminate the disadvantages inherent in the analogue and the prototype, as well as increasing the utilization of coal in its processing (enrichment).

To solve the problem in a coal processing technological complex, including a coal preparation plant producing concentrate, rock, industrial product and coal sludge, a water-coal slurry preparation unit (coal slurry) from coal sludge, a station with boiler units for generating thermal and (or) electric energy, a plant VUS is additionally equipped with areas for fine crushing of industrial products and wet grinding and mixing of finely divided industrial products and a water-coal suspension, originally made up on the basis of coal sludge, and the station is equipped with boiler units for the joint combustion of WUS and crushed industrial product.

The equipment of the VUS preparation unit for the areas of fine crushing of intermediate products and wet grinding and mixing of finely divided intermediate and water-coal slurry, originally prepared on the basis of coal sludge, allows to provide:

- dosed supply of the initially prepared water-coal suspension based on coal sludge and finely divided industrial product for the preparation of WCS for direct combustion in the boilers of the station. Moreover, given that fluctuations in the ash content of industrial products, as a rule, do not exceed 10% (abs.) Of the nominal value (25 ÷ 30%), and fluctuations in the ash content of coal sludge exceed 20 ÷ 25% (abs.) Of the nominal value (35 -40%), then it is possible to adjust the quality of the WCS by ash content (as a rule, to reduce the ash content) by adding intermediate product to the process of preparing a water-coal slurry, which is sent for direct combustion in the boilers of the station;

- adjustment of the mass fraction of the solid phase of the water-carbon suspension (in the direction of its increase) due to the dosed supply during the preparation of the WCS of finely divided industrial product. In this case, the initially prepared coal-water slurry based on coal sludge with a mass fraction of the solid phase of 45 ÷ 50% is the liquid phase during wet grinding and mixing of finely divided industrial product and the initially prepared suspension;

- adjustment of the particle size distribution of coal particles in the finished suspension due to wet grinding of finely divided intermediate product and simultaneous grinding and mixing with the initially prepared water-coal suspension.

The station’s equipment for the production of thermal and (OR) electric energy by boilers for the joint combustion of WUS and crushed by-product (coal) allows to increase the efficiency of steam boilers and to provide reliable and stable steam production of the necessary parameters for a turbogenerator even with a decrease in the quality of the WCS (low values of lower heat )

The drawing shows a flow chart of the proposed technological complex for coal processing.

The coal processing technological complex consists of a coal preparation plant 1 with a wet enrichment process, a coal slurry preparation unit 2 based on coal sludge, an industrial product fine grinding section 3 and a wet mill grinding and mixing section 4, and a water-coal suspension originally prepared based on coal sludge, a station 5 with boiler units for generating thermal and (or) electric energy. Boiler units are intended for joint combustion of WUS and crushed industrial product.

The technological complex works as follows.

The initial coal is fed to coal preparation plant 1, where it is enriched in a wet process with the release of concentrate, rock, industrial product and coal sludge, respectively, with ash content,%: 6 ÷ 8; ≥70; 30 ± 10; 40 ± 25. The humidity of the intermediate product is 6-10.%, And coal sludge 25-45%. The size of the industrial product, as a rule, is in the range from 0 to 100 mm, and coal sludge is 0-0.5 (1) mm.

Coal slurry is sent to the installation 2 of the preparation of the initial coal suspension with a mass fraction of solid phase of 40 ÷ 50%. With this solid phase content, the initially obtained water-carbon suspension has the necessary fluidity and stability. If necessary, a plasticizer reagent is used in the preparation of the initial suspension, which provides the necessary structural and rheological characteristics of the coal-water mixture.

The intermediate product is sent to section 3 of fine crushing to obtain a finely divided intermediate product with a particle size of 0-3 (10) mm. The resulting product, together with the water-coal slurry originally prepared on the basis of coal sludge, is metered into the wet grinding and mixing section 4. A plasticizer reagent (if necessary) can be added to the composition of the initial products fed to wet grinding and mixing.

In the process of wet grinding and mixing the above products, the initially prepared water-carbon suspension plays the role of a liquid phase. The finished water-coal suspension obtained after wet grinding and mixing with an ash content of not more than 40% and a lower heat of combustion of more than 2500 kcal / kg is sent to storage tanks (not shown in the figure), from where it is pumped to the boilers of station 5 to obtain thermal and ( or) electrical energy.

The technical feasibility and high economic efficiency of the proposed technological complex is confirmed by the experimental work performed and the technological regulations and technical and economic calculations developed on the basis of the results obtained.

Table 1 presents the technical characteristics of coal sludge (filter cake) and industrial product of PF Mezhdurechenskaya.

Table 1 Name of indicator unit of measurement Numerical value Average value Limits of change coal sludge prom product coal sludge prom product Coarseness mm 0-0.5 0-100 ± 5 ± 5 Humidity % 38 6 ± 10 ± 2 Ash content % 45 27 ± 20 ± 5

The characteristics of the coal-water suspension obtained from coal sludge and a mixture of crushed industrial product and coal sludge suspension are presented in table 2.

table 2 Name of indicator unit of measurement Numerical value Coal slurry WUS WCL from a mixture of crushed industrial product and a coal slurry suspension one 2 3 four Particle size in WCS μm 0-500 0-250 Mass fraction of solid phase % fifty 64 Ash content % 62 42 Viscosity MPa · s 237 588 Net calorific value kcal / kg 1500 2568 Stability day no more than 3 not less than 30

As can be seen from tables 1 and 2, the proposed technological complex for coal processing allows the efficient use of coal sludge (filter cake) and industrial product to obtain WCS, the characteristics of which satisfy the requirements of direct combustion in boilers of thermal power plants.

Currently, a working draft of the claimed technological complex has been developed and is being implemented for the conditions of the Mezhdurechenskaya enrichment factory (Mezhdurechensk, Kemerovo region) with the production of WC and steam boilers that are supplied with coal-based slurry prepared on the basis of coal enrichment waste.

The electrical power of the newly installed turbogenerator is 1.5 MB.

Claims (1)

Coal processing technological complex, including a coal preparation plant producing concentrate, rock, industrial product and coal sludge, a coal-water slurry preparation unit from coal sludge, a station with boiler units for receiving thermal and (or) electric energy, characterized in that the preparation unit The VUS is additionally equipped with areas for fine crushing of intermediate products and wet grinding and mixing of finely crushed intermediate products and water-coal slurry, and the station is equipped with a boiler regattas for the joint combustion of WUS and crushed industrial product.