JPS62100593A - Apparatus for producing high-concentration coal-water slurry - Google Patents

Abstract

PURPOSE:To enable the automatic control of the concentration of a coal-water slurry having high concentration, by continuously detecting the concentration (water-content) and flow rate of the dehydrated cake discharged from a dehydrator using a weighing instrument, flow meter, density meter, etc., and controlling the opening of the shut-off valve of a water-supplying line. CONSTITUTION:Coal and water are supplied to a crusher 1 and the low- concentration slurry produced by the crusher 1 is supplied through a line 4 to a dehydrator 5. The dehydrated cake 6 discharged from the dehydrator 5 is transferred to a slurry-conditioning tank 7 wit a conveyer 8. The conveyer 8 is furnished with a weighing instrument 17 to determine the weight flow rate of the dehydrated cake 6. The line 4 to pass the low-concentration slurry is furnished with flow meters 16, 18, 19 and a density meter 15 and the concentration of the slurry is controlled by controlling the opening of a shut-off valve 12 of a water-supplying line 11 according to the signals transmitted from the weighing instrument 17, flow meters 16, 18, 19 and density meter 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in an apparatus for producing highly concentrated coal/water slurry.

[Conventional technology]

Methods for producing high concentration coal/water slurry (hereinafter abbreviated as CWM) can be roughly divided into three types: (1) dry method, (2) dual concentration wet method, and (2) low concentration wet dehydration method.

The dry method is a method in which water and additives are added to dry-pulverized coal, mixed and stirred (?WM).The high-concentration wet method is a method in which coal is mixed in a highly concentrated state in a pulverizer in advance. This method involves adding water and additives to produce σ at the same time as pulverization.The third low-concentration wet dehydration adjustment method involves pulverizing coal in a low-concentration state with water in a pulverizer, and producing a low-concentration slurry. This is then dehydrated using a dehydrator to form a cake, and then additives and a small amount of water are added to this cake, mixed and stirred to form a cake.

By the way, CWM by the above-mentioned low concentration wet dehydration adjustment method
Conventionally, a manufacturing apparatus having the structure shown in FIG. 2 is known. That is, 1 in the figure is a pulverizer for pulverizing coal and water to prepare a low concentration slurry. A coal supply pipe 2 and a water supply pipe 3 are respectively connected to this crusher.

The crusher 1 is connected to a dehydrator 5 via a pipe 4 through which the low #1 slurry is passed. This dehydrator 5 is attached with a conveyor 8 for supplying the dehydrated cake 6 discharged from the dehydrator 5 to a slurry adjustment M7.

Note that water generated in the dehydrator 5 is supplied to the water supply pipe 3 through a circulation pipe 9. A stirrer 10 is provided in the slurry adjustment tank 7. Further, a water supply pipe 11 is connected to the slurry adjustment tank 7, and an on-off valve 12 is interposed in the water supply pipe 11. An additive supply pipe 13 is connected to the slurry adjustment tank 7. Further, a pipe 14 for discharging the mixed slurry is connected to the bottom of the slurry adjustment tank 7.

[Problems to be Solved by the Invention] In the manufacturing apparatus shown in FIG. (moisture) and flow rate:
(conveyance amount), the properties of the cake and the additive supply arrangement.
313 to the slurry adjustment tank 7, and control the on-off valve 12 of the water supply piping 11.
It is necessary to replenish the slurry adjustment tank 7 from the water replenishment pipe 11 with water necessary to achieve the target concentration.

Note that the amount of additive injected from the additive supply pipe 13 is determined based on the discharge size of the slurry adjustment tank 7 or the coal supply from the coal supply pipe 2 to the crusher 1, etc. Ru.

However, conventionally, the only method for detecting the concentration (moisture) of the dehydrated cake discharged from the dehydrator 5 is the sampling analysis (loss on drying method), which requires about 1 hour for analysis. . Therefore, there is a large time delay in controlling the concentration of the bulbs, making it difficult to continuously obtain peels with a constant yield, and it is also necessary to perform sampling and analysis frequently, which requires a great deal of time and effort. There was a problem that

The present invention was made to solve the above problems, and
It is an object of the present invention to provide a gland manufacturing device that is capable of automatically and continuously controlling the concentration of circles.

[Means and effects for solving the problems] The present invention has the following features:
A pulverizer to which coal and water are supplied, a dehydrator to which low-concentration slurry inside the pulverizer is supplied through piping, and a dehydrated cake discharged from the dehydrator to slurry? A.
'Highly concentrated coal/water slurry with additive supply piping connected to the double tank! 1! ! In the Ia apparatus, a shaker for measuring the weight flow rate of the dehydrated cake is attached to the conveyor, and a flow meter and a density meter are installed in the piping through which the low concentration slurry flows, and these meters, flow meters and The present invention is characterized in that it is equipped with a controller that opens and closes the on-off valve of the water supply pipe based on a signal from the seal meter. According to the present invention, a measuring device,
The flow meter and density meter can continuously detect the concentration (moisture) and flow rate (conveyance amount) of the dehydrated cake from the dehydrator, and the controller to which these detection signals are input controls the on-off valve of the water supply piping. By adjusting the opening degree of α, it becomes possible to control the concentration of α fully automatically and continuously.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail with reference to FIG. It should be noted that the same members as those in the manufacturing apparatus shown in FIG.

Reference numeral 15 in the figure is a densitometer installed in the pipe 4 through which the low-concentration slurry flows, and used to measure the density of the slurry. This density meter 15 is a single tube type.

There are vibrating type, gun heel type, etc. A first flowmeter 16 for measuring the flow rate of the low-concentration slurry is interposed in the piping 4 on the downstream side of the density meter 15 . 1 in the diagram
Reference numeral 7 denotes a measuring device, for example, a load cell type, which is attached to the conveyor 8 and is used to measure the gravity of the dehydrated cake 6 on the conveyor 8. 18 in the figure is installed in the water supply pipe 11 between the slurry adjustment tank 7 and the on-off valve (electromagnetic valve) 12,
Supplementary, second flow meter for measuring the amount of water to be poured, 19
is a third flowmeter installed in the additive supply pipe 13 for measuring the injection amount of the additive. Also, 20 in the figure
is a controller for controlling the CwMia degree. This controller 20 includes a density signal S1 of the low concentration slurry measured by the density meter 15, a flow f signal S1 of the low concentration slurry measured by the first flowmeter 16+a signal S1 of the dehydrated cake 6 measured by the meter 17. Weight flow rate signal 8B + said second flowmeter 1
The makeup water flow rate signal S4 measured at step 8 and the additive flow rate signal S measured at the third flowmeter 19 are input, respectively. The controller 20 also includes a signal S8. of the true specific gravity of coal set in advance. A preset target concentration signal S7 and a preset additive density signal S8 are input, respectively.

Further, the controller 20 sends a control signal S for adjusting the opening degree of the on-off valve 12 based on the signals S, -S, l.
, is output to the on-off valve 12.

When a manufacturing apparatus having such a configuration is operated, the coal a degree and the weight flow rate of conversion in the low concentration slurry supplied from the crusher 1 to the dehydrator 5 are subtracted by the following equation.

On the other hand, the flow rate of the dehydrated cake 6 discharged from the dehydrator 5 is measured by the measuring device 8 as a signal S. Dehydrator 5
Since the weight flow rate of conversion is considered to be unchanged before and after, the degree of dewatered cake 'a' is calculated from the following equation.

Based on such a formula, Rf of water to be prepared in the slurry adjustment tank 7 is calculated as shown in the following formula.

The flow rate of water to be mixed is calculated by the controller 20, and the amount of water and the second flow meter 1 interposed in the water supply pipe 11 are calculated by the controller 20.
By outputting a control signal S from the controller 20 to the on-off valve 12 based on the deviation of the make-up water flow rate signal S4 from the water make-up water flow rate signal S4 from the water make-up pipe 11. The slurry adjustment tank 7 can be replenished more easily. Therefore, the controller 20 adjusts the sura IJ 31! ! The concentration of the circle discharged from pJ7 can be controlled automatically and continuously.

In addition, in the manufacturing apparatus shown in FIG. 1 described above, a density meter is also installed on the round discharge side of the slurry adjustment tank 7 to measure the density of the slurry, and based on this, the control by the controller is corrected again. You can also do this.

〔Effect of the invention〕

As detailed above, according to the present invention, the concentration of the milk can be automatically determined without any dehydration cake, other sampling, analysis, etc.! l! Continuously controllable, low concentration slurry concentration, conversion heavy shaking flow rit *Dewatered cake weight flow1.
It is possible to provide a high-concentration coal/water slurry manufacturing apparatus that can display and record state values such as dehydrated cake concentration on an indicator and can perform simple operation management.

[Brief explanation of drawings]

FIG. 1 is a flow sheet of a CWM manufacturing apparatus showing an embodiment of the present invention, and FIG. 2 is a flow sheet showing a conventional αN manufacturing apparatus. DESCRIPTION OF SYMBOLS 1... Pulverizer, 4... Piping for circulating low concentration slurry, 5... Dehydrator, 6... Dehydrated cake, 7... Slurry adjustment tank, 8... Conveyor, 11...・Water supply piping,
12... Opening/closing valve, 13... Additive supply piping, 15
...density meter, 16,18.19...flow meter, Z7.
...Measuring instrument, 20...Controller.

Claims (1)

[Claims] a pulverizer to which coal and water are supplied; a dehydrator to which the low concentration slurry in the pulverizer is supplied through piping; a conveyor for supplying the dehydrated cake discharged from the dehydrator to the slurry adjustment tank; In the highly concentrated coal/water slurry manufacturing apparatus, the apparatus includes a water supply pipe connected to a slurry adjustment tank and having an on-off valve interposed therebetween, and an additive supply pipe connected to the slurry adjustment tank. A measuring device for measuring the weight flow rate of the dehydrated cake is attached to the conveyor, and a flow meter and a density meter are installed in the piping through which the low concentration slurry flows, and based on the signals from these measuring devices, flow meter and density meter, A highly concentrated coal/water slurry production apparatus, characterized in that a controller is attached to adjust the opening degree of the on-off valve of the water supply pipe.