JPS594484A - Treatment of coal ash - Google Patents

Abstract

PURPOSE:To improve dehydration efficiency and to reduce consumption of fresh water, by grinding coal ash clinker in a water treatment tank, then storing the same in a sepn. tank, allowing the coal ash to settle, and dehydrating centrifugally only the concd. coal ash slurry to cake. CONSTITUTION:The clinker 9 carried from a coal boiler 8 is charged in a water treatment tank 1, where the same deposits on a bottom plate 1a. The deposited clinker is flowed down by the water flow ejected from a jet nozzle 3 so as to flow through a gate 2 into a grinder 10 where the clinker is ground to a slurry 11. The slurry 11 flows into a sepn. tank 14 and is stored therein. The slurry 11 admitted into the tank 14 is agitated by an impeller 16 which is rotated at a very low speed by a driving motor 15 so that the ashes are settled by centrifugal force and gravity. The supernatant liquid flows through an overflow pipe 17 into a filtrate tank 18, and the concd. slurry is fed to a centrifugal dehydrator 22. The formed coal ash 24 is conveyed with a belt conveyor 25 and is discarded by a dump car 27, etc.

Description

[Detailed description of the invention] Clinker gold is put into water to extinguish the fire and blow away dust using RF! i'
fr: This relates to a coal ash processing method in which coal ash is centrifugally dehydrated and disposed of after being prevented.

Conventionally, coal ash has been treated using a dynamic separation method using a settling pond or a settling tank, but the former requires a vast settling tank and is time-consuming to remove the settled ash. However, the latter method requires a large tank and is difficult to obtain clear waste liquid. Furthermore, in both methods, coal ash is generally porous, so the coal ash to be disposed of has a high moisture content, making it difficult to handle. However, since it was large in weight and volume, it was troublesome to transport.

The present invention aims to eliminate the drawbacks of the above-mentioned conventional methods, and will be specifically described below with reference to the accompanying drawings.

(1) is a water treatment tank, and a groove 11La is provided at the lower end (right end in the drawing) of the sloping bottom plate (1a), and a jet nozzle (3) and water injection pipe (3) are installed at the upper end from below. 4) One end is connected. Jet nozzle (3
) and the other end of the water injection pipe (4) are respectively connected to the first valve +
51 and the second valve (6), the circulating water pipe (7)
It is connected to the.

The tarinka (9) carried out from the coal boiler (8) is dropped into the water treatment tank (1) and extinguished, and the bottom plate (1a)
deposit on top.

This tarinka (9) flows down the inclined bottom plate (Ia)' by the water jet ejected from the jet nozzle (3), flows into the crusher [10] through the gate (2), and is crushed into slimmer. (11), and ejector pump +12
from the circulating water pipe (7) to the third valve t.
The water flowing through 131i flows into an inverted cone-shaped separation tank (141) and is temporarily stored therein.

At the bottom of the separation tank (a), there is a stirring blade +161 that is rotated at a very low speed by a drive motor (15).
The ash gradually settles, and the supernatant liquid is transferred to the filtrate tank (18) through the overflow pipe [17i] installed at the top of the separation tank (old).
be fluent in

Concentrated slira (formerly) is passed through the liquid feeding pipe 09) connected to the bottom of the filtrate tank 08) and the fourth valve +20+ ((
After that, the centrifugal dehydrator (22) is powered by the liquid feed pump (21).
sent to.

The stirring blade (6) also serves to completely prevent the suction port of the liquid feeding pipe Q9) from being blocked by Suriraro D.

The filtrate separated in the centrifugal dehydrator (22) is: the filtrate pipe CI! installed at its lower end. After 31 k, the liquid was poured into the filtrate tank (18), and the formed coal ash cake (24
) is conveyed by the belt conveyor (25) to the cake hopper c! 6) and disposed of by a dump truck (2η, etc.).

The filtrate collected in the filtrate tank (18) is transferred to the filtrate pump (2).
8), the return pipe 29) and the fifth valve f30)'
After that, it is circulated and used through the circulation pipe (7).

The circulating water that is discarded in the cake (2a) and gradually becomes insufficient is replenished from the water supply pipe Gll through the 6th valve Ozwo, and is used when there is excess supply, when the circulating water is renewed, or When the device is completely stopped, open the seventh valve 03.
The water is drained through the drainage pipe 04 connected to the circulation pipe (force).

As described above, according to the method of the present invention, once concentrated surin (IIJ') is centrifugally dehydrated, the dehydration efficiency is high and the process can be performed using a relatively small centrifugal dehydrator.

In addition, since the centrifugally dehydrated cake (24) has a significantly lower water content than conventional cakes, it is easy to handle and transport, and the filtrate is circulated for use. does not discharge wastewater to the outside, and therefore consumes significantly less fresh water.

Furthermore, compared to conventional equipment, the equipment for implementing the invention is
The installation space is extremely small, and fully automatic operation is possible.

[Brief explanation of the drawing]

The drawings are process diagrams showing the method of the present invention. (1) Water treatment tank (1a) Bottom plate (2)
Dirt (3) Jet nozzle (4) Water injection pipe (5) First valve (6) Second valve (Power) Circulating water pipe (8) Coal ash boiler
(9) Talinka UO+ Pulverizer Old) Surin] 12) Ejector pump (13) 6th valve 141 Separation tank (15) Drive motor +161゛ Stirring blade α
71 Overflow pipe 08) Filtrate tank 09)
Liquid sending pipe (20) Fourth valve (21) Liquid sending pump (2'21 Centrifugal dehydrator (23) Filtrate pipe (24) Cake (251 Belt conveyor (261 hopper '(27) Dump truck
(28) Filtrate pump c! 9) Return pipe (
30) Fifth valve 01) Water supply pipe 02
No. 6 Hull (33 No. 7 Valve (341 Drainage Pipe Procedure Amendment (Spontaneous) August 2θ, 1982 Patent Application No. 112506 2, Title of Invention Coal Ash Treatment Method 3, Case of Person Making Amendment) Relationship with Patent Applicant Address Name) Narasaki Shipbuilding Co., Ltd. 5, Date of Amendment Order Voluntary 6, Number of Inventions Increased by Amendment - 112X - 11 (
Contents of correction) (1) F! The ``Claims'' on page 1, lines 5 to 11 of Part A will be corrected as shown in the attached sheet. (2) "Motion" on page 1, line 18 of the specification and page 6, line 8 of the same specification are corrected to "gravity." (3) Page 6 lines 1-2, line 48, page 12 of the specification
Line 16, page 4, line 13, page 5, line 10
Correct the word ``srilla'' in the first line to ``slurry.'' +41 Specification page 6 line 12 “3 liquid tank +18
Correct 1J to 1゛separation tank α leakage.'' (The word ``underarm'' in line 20 of No. 6 of the Specification No. 51 is corrected to ``flow down''. (Above) (Claims) After pulverizing, the coal ash is temporarily stored in a separation tank, the coal ash is allowed to settle, and only the concentrated coal ash slurry is dehydrated using a centrifugal dehydrator and disposed of as a cake. A coal ash treatment method in which the supernatant liquid and the liquid from the centrifugal dehydrator are returned to the water treatment tank and circulated.'' (The above)

Claims (1)

[Claims] Coal ash clinker discharged from coal boilers, etc. is put into water in a water treatment tank, then pulverized, temporarily stored in a separation tank, the coal ash is allowed to settle, and only the concentrated coal ash slurry 2 is centrifuged. A coal ash treatment method in which the water is dehydrated using a dehydrator and disposed of as a cake, and the supernatant liquid from the separation tank and the liquid from the centrifugal dehydrator are returned to the water treatment tank for circulation.