SU1749627A2 - Production line for hydraulic removal of ash and slag - Google Patents

Abstract

The invention relates to the removal of ash and slag from boiler units and can be used in thermal power plants operating on solid fuels. The aim of the invention is to additionally obtain a concentrate of hollow microspheres and improve their quality. The technological line for the hydraulic removal of ash and slag contains sectional plate thickeners, adjustable gate valves, discharge chambers, separation and guide plates, devices for adjusting the height of the plates, turning chutes, two-section washing units. The drain from the sectional plate thickeners with hollow microspheres enters the drain chamber, from where it passes through the guide plates through the rotary chute to one of the sections of the washing unit, from which it is removed for dehydration, drying and packaging. 1 hp f-ly, 2 ill.

Description

The invention relates to the removal of ash and slag from boiler units and can be used in thermal power plants.

A known processing line for the hydraulic removal of water from slag according to E.C.M. 1486704, M. C 4F23 J 1/02.

The technological line contains a pump for the supply of ash and slag pulp, a conical hydro roar, pulp dividers. sectional plate thickeners, vacuum filters, conveyors and piles of dehydrated products. Each thickener section is connected to slurry pulverizer by separate ducts equipped with adjustable valves.

As a result of using the process line, slag and ash concentrates of constant composition are obtained that meet the requirements of their use, for example, slag + 3 and ash concentrate of 3-0.25 mm - as concrete aggregates: coal-coal concentrate 0.24-0.08 mm - as a low-calorie fuel and fuel additive: ash concentrate 0.08-0.04 mm - raw materials for wall materials, cement, aggregates: 0.04-0.005 mm - small active additive in concrete.

A disadvantage of the known production line is the impossibility of using it to obtain a concentrate of hollow microspheres.

The hollow microspheres are contained in the ashes in insignificant amounts (0.2-2%), but they are of great consumer value due to their low bulk density.

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density (300 500 kg / m3}, small sizes of hollow spherical particles (up to 0 04 mm) and their high heat resistance

The aim of the invention is to obtain a concentrate of hollow microspheres in the process of removing ash and slag, in addition to obtaining ash concentrates.

The essence of the invention is. that in the process line for the hydraulic removal of ash and sludge according to the USSR automatic certificate No. 1486704, the thickeners of each stage 7-10 are united by common discharge chambers 24, 33 in the middle of the chambers parallel to the discharge direction, a separation plate is installed in which on opposite sides of the drain hole at an angle 95-125 ° to the drain, the guide plates 33-36 are attached, having devices for adjusting their height position 37-44, which are connected to adjustable valves 22-25 of the corresponding technological level. Outside the drain line camera guide plates are within the swivel troughs 41-44. connected to two-section washing units 45-48 equipped with a rowing device and nozzles for introducing water, draining slurry and withdrawing microspheres, which are fed for dehydration and drying. When washed, impurities of ash and others are removed, which improves the quality of the microspheres.

Fig 1 and 2 shows the scheme of the technological line.

Positions 1-28 refer to the known processing line, which contains a pump 1, a conical hydro-screen 2, a pulp separator 3, 4, 5, 6, sectional plate thickeners 7 8, 9,10 vacuum filters 11, 12, 13, 14 , 15, conveyors 16, 17, 18, 19, 20. piles of dehydrated products 21, adjustable valves 22, 23, 24, 25, 26, pump 26. When removing ash and slag from a dump, instead of 1, install a jetting pump 27 and a sump pump 28.

The proposed processing line additionally contains drainage chambers 29, 30, 31. 32. separator and guide plates 33 34, 35,36, devices for adjusting the height of plates 37, 38, 39, 40, rotary troughs 41, 42, 43, 44, two-section washing units 45, 46, 47, 48.

The preparation of microspheres is carried out at each stage of the processing line, except for the first one. The undecided microspheres with a drain come to the next stage of the line, where they are removed.

Research has established that efficient trapping of microspheres is achieved with a specific load on sections.

thickener equal to 12-25 m / m Since the amount of pulp entering the thickener section is controlled by valves, depending on the requirements of zone separation

for boundary grain classes, devices 37-40 connected with adjustable valves 22-25 support the optimum position of the guide plates along the height of the discharge chambers

0 Technological line works as follows.

Ash and slag slurry is pumped by pump 1 along a slurry pipeline to a conical hydroshield 2, where slag is extracted from the pulp.

5 larger than 3 mm. and the discharge from the screen enters the pulp divider 3, from which the pipe enters the thickener 7 through pipelines with open valves 22 and separates the condensed concentrate of the required size, and the sheet containing the hollow microspheres enters the common chamber 29 Laminarization of the pulp stream, which provide a lamellar section of the thickener contributes to the separation of hollow

5 microspheres of ash and their ascent with a drain From the drain chamber, the hollow microspheres along guide plates 33, submerged by a height adjustment device 37, approximately 2 cm, flow through the bow chute 41 into one of the sections of the washing unit 46, from which the for dehydration, drying and packaging

The drain from the chamber 29 passes under the plates 33 and enters the pulp divider 4

5 of the next step, where the process of producing hollow microspheres is repeated as described. Also receive a concentrate of hollow microspheres and at subsequent stages of the technological line.

0 When removing ash and slag from a heap, obtaining a concentrate of hollow microspheres on a production line is similar to that described.

Example 1 of removing ash

5 and slag at the base facility (the base facility of Voroshilovgrad Power Plant). On the existing lines of ash and slag removal, consisting of dredge pumps and pressure slurry pipelines, production of concentrate

0 hollow microspheres impossible

Example 2 of the implementation of the removal of ash and slag on the proposed process line

Slag slurry pump 1 is served in

5 conical hydrocircuit 2, and ash pulp - into pulp divider 3, where the discharge from screen 2 also flows. Through adjustable valves 2 the pulp enters the plate thickener sections 7, in which ash coarsely precipitated

the concentrate, and the drain containing hollow microspheres, enters the discharge chamber 29, from which the hollow microspheres using guide plates 33, automatically submerged by the device 37, is fed through the rotary chute 41 into the section of the washing unit 45, and the drain enters the pulp divider A the next stage of the processing line and then to the thickener 8, where the process of obtaining the concentrate of hollow microspheres is repeated as described above. Similarly, microspheres are obtained at subsequent stages of the processing line. A concentrate of hollow microspheres from all the steps of the line is fed to dehydration and drying, and then packaged.

As a result of using the proposed process line, in addition to slag and ash concentrates, a concentrate of hollow microspheres is obtained in an amount of 0.36-3.6 t / h or thousand tons / year.

Claims (1)

Claim 1. Technological line for hydraulic removal of ashes and slag according to Aut. No. 1486704, characterized in that The purpose of additional preparation of the concentrate of hollow microspheres, thickeners of each stage are united by a common discharge chamber, equipped in the middle, in a directional direction, by a dividing plate with attached on both sides to it, at an angle of 95-125 ° to the discharge, guiding plates made with devices adjusting their up position connected to adjustable valves. 2 Technological line pop. 1, characterized in that, in order to improve the quality of the hollow microspheres, it is provided with a rotary chute and a two-section washing unit, while the guides the plates outside the discharge chamber enter the rotary chute connected to the two-section washing unit. / From TPP USED KjzytutwbHofy device 28 & .fr BmSajt  I am 31 9 5, s % I 1y , 35 F 4 $ Fy Type A FIG. 2 kl 45