SU1571057A1 - Method of obtaining fuel briquettes - Google Patents

Abstract

This invention relates to a technology for the production of fuel briquettes for household and industrial needs. The goal is to increase the efficiency of the method of producing fuel briquettes and to expand its field of application by using it at peat briquette plants with steam dryers. Upon receipt of the fuel briquettes, the original peat is separated on the screens, crushed in hammer crushers and fed into the storage tank. From the latter, it is metered to mix with coal in the required ratios. Before mixing, the coal is dried in hammer mills. The prepared peat and coal dried pegs are mixed in predetermined ratios in a mixer and fed to a dryer. Moisture peat-coal composition at the outlet of the dryer should be in the range of 15-20%. The resulting peat-coal mixture is preformed on briquette stamp presses. 1 ill., 1 tab.

Description

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This invention relates to a technology for the production of fuel briquettes for household and industrial needs.

The purpose of the invention is to increase the efficiency of the method and expand its field of application by using it in peat briquette plants with steam tube dryers.

The drawing shows the scheme of the proposed method.

The method of obtaining fuel briquettes includes grinding and drying of coal and peat, which they are

mixing and pressing, while the coal is dried and crushed to a fraction size of 0-3 mm, after which it is metered, mixed with prepared, crushed and dosed peat, then the peat composition is fed for drying.

To increase the bulk density of the material supplied for drying, and consequently, to increase the productivity of peat briquette factories, crushed and dried coal is mixed with prepared and crushed milled peat, pos01

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For this reason, the peat-coal composition is supplied to the dryers, where the peat is dried to a moisture content of 15-20%. The resulting peat-coal composition is preformed. To reduce energy consumption for grinding, its coal is crushed to the size of fractions of 0-3 mm in order to preserve the quality of the final product. In addition, to stabilize the process and increase its efficiency, the prepared peat and coal are metered in predetermined ratios before mixing.

The method is carried out as follows. v

The initial peat is separated by moisture 50-55% at the screens, crushed in hammer crushers and fed into the storage capacity, from where they are metered for mixing with coal in the required ratios.

The coal is crushed and dried in hammer mills with a shaft separator to fraction sizes of 0-3 gm and a moisture content of 5-6%. Then the coal dried pulp is fed into a storage capacity, from where it is metered for mixing with prepared and wet peat mounds coal was 25-35%.

The prepared peat and coal drier are mixed in predetermined ratios in the mixer and fed to the dryer, where the peat is dried to a moisture content of 15-20% 3 and the moisture of the peat-coal composition at the outlet of the dryer must be within 15-20%. The resulting peat-dried pegs are preformed on briquette stamp presses. Example 1. A bunker feedstock peat was fed to a separator using a belt conveyor, where peat stumps were sifted out, after the separator the peat was ground in a hammer mill, sieved on a roll-disk screen. The coarse fraction was ground again in a crusher. The prepared peat was sent to a bunker, from where a screw metering conveyor was fed for mixing with coal.

Coal from bunker raw materials was supplied by a separate feeder to a belt conveyor, by which coal was fed to a hammer mill equipped with a separation shaft. At the same time, air was blown into the mill to separate and dry the coal. Prepared sediment coal 7

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c in a cyclone, from where a screw conveyor metering was fed for mixing with peat. Peat and dried coal were fed by a single belt conveyor to the drying compartment, where they were mixed in the dryer feeders. The peat-coal composition was fed to Tsemag tube dryers, dried to a moisture content of 15-20% and briquetted on stamp presses. The mass fraction of coal in briquettes was 30 ± 5%. Peat was processed with moisture of 45.6% with a bulk density of 374 kg / m. Coal was processed at a moisture content of 13% with a bulk density of 819 kg / mea. The weighted average particle size of the original coal was 7.3 mm, the initial peat was 3.5 mm, the fraction of the original coal was 0-30 mm, and the original peat was 0-15 mm. The coal content in the briquettes was kept constant within 30 wt.%. The size of the particles of coal was regulated by the flow rate of air supplied for drying and separation of coal. The size of coal fractions is 0-1 mm, prepared peat is 0-6 mm. Peat remained unchanged in all examples. The bulk density of coal with a fraction size of 0-1 mm is 584 kg / m, the strength of the obtained peat-coal briquettes when tested in a drum is 91.8%, the capacity of the briquette plant is 10.2 tons / h. The load on the electric motor of the mill is 180 A,

PRI mme R 2. Coal crushed - to the size of fractions 0-1,5 mm. The bulk density of coal is 606 kg / m3, the strength of briquettes is 92.9%. The plant capacity is 11.4 tons / h. The load on the motor of the mill is 180 A.

PRI me R 3. The coal was crushed to the size of fractions 0-2 mm. The bulk density of coal is 667 kg / m3, the strength of briquettes is 94.8%, the capacity is 12.6 t / h, the load on the mill electric motor is 160 A.

PRI me R 4. The coal was crushed to the size of fractions 0-3 mm. The bulk density of coal is 772 kg / m, the strength of briquettes is 94.8%, the capacity is 13.2 -t / h, the load on the electric motor of the mill is 142 A.

PRI me R 5. The coal was crushed to the size of fractions 0-5 mm. The bulk density of coal 793 kg / m, the strength of briquettes 92.5%, performance

13.6 t / h, load on the mill electric motor 137 A.

And p and me R 6. The coal was crushed to the size of fractions 0-7 mm. The bulk density of coal is 801 kg / m, the strength of briquettes is 91.1%, the capacity is 13.4 t / h, the load on the electric motor of the mill is 133 A.

The moisture of peat-coal dried in all examples is 15-16%.

The table shows the results. experiences.

Analysis of the results shown in the table shows that when coal is crushed to a fraction size of 0-3 mm, the load on the mill motor decreases to 142 A, as opposed to 160 A when grinding coal to a fraction size of 0-2 (according to the prototype). At the same time, the strength of the briquettes remains constant, and the productivity of the plant increases due to an increase in the bulk density of the dry stock, since the bulk density of the coal also increases.

There is a separation of briquettes in a plane parallel to

end stamp of the press on large particles (5-7 mm) angle.

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The productivity of the plant increases in comparison with the prototype due to the fact that the material (peat-coal composition) with a higher bulk density than the basic variant is fed to the drying and then to the pressing.

Claims (1)

Invention Formula The method of producing fuel briquettes, including the preparation of peat-coal mixture by grinding, drying and mixing the components and pressing the mixture, characterized in that, in order to increase the efficiency of the method and expand its field of application using peat briquette plants with steam tube dryers, before drying it is mixed with crushed and dried coal and then produced drying the resulting peat-coal mixture and pressing it.