SU1486704A1 - Process line for hydraulic removing of ash and slag - Google Patents

Description

The invention relates to the removal of ash and slag from boiler units and can

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be used in thermal power plants operating on solid fuels. The aim of the invention is to obtain in the process of removing ash and slag ash and coal-ash concentrates required for the use of the composition and use of heat of the return water. The essence of the invention lies in the fact that the processing line is made up of sequentially placed thickeners 7-10, connected to the supply puls splitters 3-6 and vacuum filters 12-15. The thickeners are made of plate sections, each of which is connected to the pulp splitters by a separate pipeline. After dehydration, the coal-ash concentrate by conveyors 16-20 is removed into piles 21, under which the return water pipelines are laid., 1 h. item f-ly, 1 ill. and 1 tab.

1486704

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The invention relates to the technique of removing from the boiler units of mineral residues of solid fuel combustion (ash and slag) and can be used in power engineering and other sectors of the national economy that have solid fuel-fired boiler units to remove ash and slag from previously formed dumps and release lands occupied by them.

The purpose of the invention is to obtain in the process of removing ash and slag ash and coal-ash concentrates required for the use of the composition.

The drawing shows the scheme of the process line.

The technological line contains a pump 1 for feeding slag-like pulp, a conical hydro-screening device 2, pulp dividers 3-6, sectional plate thickeners 7-10, vacuum filters 11-15, conveyors 16-20, piles of 21 dehydrated products and pipelines. Each section of the thickeners is connected to the pulp splitters with separate pipelines equipped with adjustable valves 22, 23, 24, 25. Pump 26 returns water to ash removal. When removing ash and slag from the dump, instead of the pump 1, the jetting pump 27 and the suction pump 28 are installed.

Technological line works as follows.

Ash-slag pulp from ash collectors and slag-receivers pump 1 is fed along a pulp line into a conical hydro-screener 2, where slag is separated into slag of more than 3 mm in size, fed to a vacuum filter 11, after which the dried slag is removed by a conveyor 16 to the stack.

Drain from screen 2 enters pulp divider 3, from which pipelines with open valves 22 enters connected to pipelines of thickener 7. Regulating the opening or closing of valves, the number of thickener sections 7 required by area is released and a condensed ash-slag concentrate is released, for example, according to the boundary sizes of particles — 3.0 and + 0.25 mm, entering the vacuum filter 12. The dehydrated concentrate is removed by a conveyor 17 into a pile.

Drain from thickener 7 enters pulp divider 4, from which it enters the included sections of thickener 8 through pipelines with open valves 23. Condensed coal-ash concentrate, for example, by boundary particle sizes —0.25 and + 0.08 mm goes into vacuum the filter 13 and after dehydration by the conveyor 18 is removed to the stack.

The drain from the condenser 8 enters the pulpodeller 5 and, similarly to the previous, to the included sections of the condenser 9, from which thickened ash concentrate, for example, on the boundary particle sizes —0.08 and +0.04 mm goes into the vacuum filter 14

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and dehydrated by conveyor 19 is removed to the stack.

Drain from thickener 9 enters pulp divider 6 and then into included sections of thickener 10, from which condensed ash concentrate, for example, from particle boundary sizes –0.04 and +0.005 mm, goes to vacuum filter 15 and dehydrated by conveyor 20 is removed to the stack.

The discharge from the thickener 10 according to the content of ash particles less than 0.005 mm in size meets the requirements for clarified water, and enters the pump 26, by which water is returned to the ash collectors and slag receivers through pipelines. Pipelines are laid under the shelters of conveyors 16-20 and in the form of combs under piles 21, heating dehydrated ash and slag classes.

With a separate supply of slag and aeolian pulp, slag pulp is pumped by pump 1 into a conical hydroshield 2, and aeolian pulp into a pulp divider 3 and together with a drain from screen 2 enters a thickener 7 and further like that described above.

When using a process line to remove ash and slag from the heap on. The dump installs the hydromonitor 27 and the suction dredger 28, which serves ash and slag pulp through the slurry pipeline to screen 2. Next, the production line works similarly to that described for ash and slag pulp coming from the ash collector and slag receivers, except for returning clarified water that is not used for heating dehydrated ash and slag classes , and return to the monitor.

Regulating the values of the areas of the working sections of the thickeners, they set the required boundary sizes of the particles of the emitted ash concentrates. The values of the required areas of thickener sections in the table are confirmed by research.

As a result of using this technological line, slag and ash concentrates of constant composition are obtained that meet the requirements of their use in the following areas: slag and concentrate +3 and 3-0.25 mm - aggregates of concrete: ash-coal concentrate 0.25— 0.08 mm - low-calorie fuel and fuel additive; ash concentrate 0.08–0.04 mm - fuel and raw material components of the charge in the production of ceramic wall materials, cement, raw materials for ash aggregates; 0.04–0.005 mm ash concentrate - small active aggregate of concrete and raw materials of the charge in the production of cellular concrete and silicate products, raw materials for ash aggregates.

Removal of ash and slag on the proposed process line eliminates the need for construction and operation of the hydro 1486704

dump, and the national economy will receive the prepared raw material of constant composition for use in the building materials industry and construction.

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Claims (1)

Claim 1. Technological line for hydraulic removal of ash and slag, containing pumps, slurry pipelines, thickeners, vacuum filters and conveyors, characterized in that, in order to obtain the ash and slag concentrates required for use in the process of removing ash and slag, it is made stepwise , with the first stage being equipped with a conical hydro-sounding device connected to a vacuum filter, while the subsequent stages are equipped with pulvering machines and thickeners made of plate sections with a collecting funnel, each sec Ia pulpodelitelem connected to a separate conduit, provided with an adjustable valve and funnel - a vacuum filter. 2. Line on π. 1, characterized in that, in order to use the heat of the return water, the water pipelines are laid under the shelters of conveyors and under the stacks of dehydrated ash concentrates. room condensations The amount of incoming pulp, m ³ / h Required area of thickener sections ^ ² The resulting ash concentrates Unburnt fuel content % Border dimensions, mm Approximate quantities 7o t / h - thous.t / g one 1800 (slag) eight +3 14 30.8 270 2 5250 thirty 3-0.25 9 19.9 175 five (ash + slag) 3 5230 50 0.25-0.08 13 28.6 250 52 four 5200 100 0.08-0.04 27 59.4 520 15 five 5150 200 0.04-0.005 36 79.2 695 eight 6 5100 Drain -0.005 one 2.2 20 Total 100 220 1930 17 (average for ash) including ash 82 180 1580 slag 18 40 350