Ash extrusion apparatus and ash extrusion method

Abstract

To provide an ash pushing device and an ash pushing method which can be achieved by improvement of an existing stoker type incineration facility without any need for an additional large scale device, suppress an increment of energy to be used, and can recover valuable metals.SOLUTION: An ash pushing device includes a water storage part 10 for receiving a main ash discharged from a stoker type incinerator and cooling the main ash with water, a chute 40 which is provided on one end side of the water storage part and discharges the cooled hydrous main ash, an inclination part 20 which is provided from the water storage part to the chute so as to be inclined upward, and a pusher 30 for pushing the main ash charged into the water storage part toward the inclination part, wherein the chute is partitioned into a first chute 43 and a second chute 45, a scraping drum 50 rotating in a direction opposite to a travel direction of the hydrous main ash from the inclination part to the chute is provided between the first chute and the second chute, and a slide adjustment plate 60 for adjusting the dimension of the charging opening to the first chute is provided between the tip of the inclination part and the scraping drum.SELECTED DRAWING: Figure 2

Claims

1. A water reservoir that receives and cools the main ash discharged from the stoker-type incinerator, A chute is provided on one end of the water storage section for discharging cooled, water-containing ash, An inclined section is provided that slopes upward from the water storage section to the chute, A pusher that pushes the main ash deposited into the reservoir toward the inclined section, An ash extrusion device for a stoker-type incinerator, comprising: The shot in question is divided into a first shot and a second shot. Between the first chute and the second chute, a scraping drum with adjustable rotation speed is provided, and the upper blades of the scraping drum are positioned to rotate in a direction opposite to the direction of travel of the water-containing ash so that they can scrape the lower layer of water-containing ash from the inclined section toward the chute and feed it into the first chute. A sliding adjustment plate is provided between the tip of the inclined section and the scraping drum to adjust the dimensions of the opening for feeding into the first chute. An ash extrusion device for a stoker-type incinerator, characterized by the following features.

2. The ash extrusion apparatus according to claim 1, characterized in that the extrusion surface located at the tip of the pusher has at least a portion of an inclined portion formed to protrude in the forward direction of the pusher.

3. The ash extrusion device for a stoker-type incinerator according to claim 1 or 2, characterized in that the pusher can reciprocate multiple times with a stroke length of half a stroke or less from the retracted limit position of its extrusion surface to fluidize and agitate the ash and water introduced into the water reservoir to produce water-containing ash, the extrusion surface can be stopped for a predetermined time, and the extrusion surface can be operated with its full stroke length from the retracted limit position to the forward limit position to compress and convey the water-containing ash to the inclined section, thereby causing relatively small particle size particles or relatively heavy components in the water-containing ash to settle and relatively large particle size lightweight components to float, thereby forming a first water-containing ash and a second water-containing ash with different content of valuable metals.

4. An ash extrusion method for separating and recovering main ash in a stoker-type incineration facility equipped with an ash extrusion device according to claim 1 or 2, The process involves a stirring and mixing step in which the main ash introduced from the stoker-type incinerator into the water reservoir is agitated and mixed by a pusher with multiple reciprocating motions of half a stroke length or less to form water-containing main ash, and a quiescent step in which the pusher is stopped for a predetermined time to allow relatively small particle size or heavy components in the water-containing main ash to settle and relatively large particle size light components to float to the surface. The process includes a compression and conveying step in which the pusher is advanced along its entire stroke length to compress and convey the water-containing ash to an inclined section, The stirring and mixing step, the stationary step, and the compression and conveying step are repeated multiple times, compressing and conveying the water-containing ash upward along the inclined section to the chute, while relatively small particle size particles or relatively heavy components in the water-containing ash are allowed to settle and relatively large particle size light components are allowed to float to the surface, thereby forming a first water-containing ash and a second water-containing ash with different concentrations of valuable metals. An ash extrusion method characterized by, when the water-containing ash reaches the tip of the inclined section, rotating the upper blades of the scraping drum in a direction opposite to the direction of travel of the water-containing ash to scrape off the lower layer of water-containing ash and feed it into the first chute, feeding the remaining water-containing ash into the second chute, thereby separating and recovering water-containing ash with different concentrations of valuable metals.

5. The ash extrusion method according to claim 4, wherein the first water-containing bottom ash is a highly concentrated bottom ash of valuable metals with a relatively high concentration of valuable metals, and the second water-containing bottom ash is a low concentrated bottom ash of valuable metals with a relatively low concentration of organometallic compounds.

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