JPH09255131A - Spray cleaning device of conveyor connecting part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the running cost of a conveying pump by installing a spraying shower control valve in a shoot spraying shower inlet port side, carrying out a cleaning with a washing shower of a belt conveyor, and receiving wash water out of a recovery hopper with a sump pit, then transmitting it to a waste water treatment device. SOLUTION: The discharge of a shoot spraying shower is controlled by a shower control valve D and wash water to be fed to a waste water treatment device by a drain control valve E, respectively and in addition, a connecting control valve F is installed there. In addition, a coal stocking switch 14 to detect whether there is coal or not is installed on a belt conveyor 3, and a water level gauge 15 detecting a lower limit level is set up on a sump pit 9. Moreover, a flow meter 16 detecting an amount of discharge in the shoot spraying shower is installed at the downstream of the shower control valve D. An interval ranging from a distributing pump 10 to the drain control valve E and anther interval ranging from the shower control valve D to the flow meter 16 are connected by a connecting pipeline 17, and the connecting control valve F is installed in the point midway in this pipeline. The discharge of a spray shower 2 is detected by the flow meter 16, keeping the opening of the shower control valve D in the case where it is a specified value. With this constitution, an amount of running cast in a plant is reducible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sprinkler cleaning device provided at a connecting portion of a belt conveyor for transporting loose materials such as coal.

[0002]

2. Description of the Related Art FIG. 4 is a schematic view of a conventional sprinkler cleaning device for a transfer section of a conveyor. In the figure, reference numeral 1 denotes a belt conveyor connecting portion, which is a portion where the coal 12 transfers from the upstream belt conveyor 3 to the downstream belt conveyor 4. Transit section 1
In this case, the coal 12 drops, and the pulverized coal contained in the coal becomes dust and scatters. Therefore, the hood 5 is provided.

In order to reduce dust generation at the transit section 1 and to prevent dust from piles of coal carried by a belt conveyor and piled up, the maximum amount of coal transported per transit section is increased. Watering about 1%. For example, when the transport amount of coal is 3000 t / h, 30 t / h of water is sprinkled. Sprinkling is performed aiming at the coal 12 that drops from the chute sprinkling shower 2 at the connecting portion. Meanwhile conveyor belt 3
Since pulverized coal adheres to the surface of the scraper 11
Although it is scraped off by a, it does not drop sufficiently in a dry state, so cleaning water is applied to the return side 3a of the conveyor belt by the cleaning shower 6a. After applying the cleaning water, the scraper 11b is used to scrape off the moist deposits. 7 is a recovery hopper for recovering the washing water. The upper surface of the hopper 7 is cleaned by the cleaning shower 6b. The wash water flows from the recovery hopper 7 through the strainer 8 into the drain pit 9. A drainage pump 10 sends the wash water from the drainage pit 9 to the wastewater treatment device. The wastewater treatment device is composed of a coagulation stirring tank, a coagulation sedimentation tank, a sludge dewatering device, etc. The treated water is reused, and the sludge is dewatered and sent to a coal storage yard for use as fuel.

[0004]

In the conventional sprinkler cleaning device for the transfer section of the conveyor described above, the cleaning water has an SS (amount of suspended solids) of about 5000 ppm and the flow rate is 1/4 to 1 of the chute spraying shower flow rate. It is / 5 and cannot be discharged as wastewater as it is, so wastewater is treated.
However, a large amount of coagulant is required for wastewater treatment, and transportation costs for transporting the dehydrated sludge to the coal storage yard are high, resulting in a large running cost. Further, since the collected water having SS of about 300 ppm is conventionally used for watering the chute, the running cost of the pump for collecting the collected water is high.

The present invention has been devised in view of the above-mentioned problems. Therefore, the load on the waste water treatment equipment is reduced, the running cost is reduced, and the running cost of the water feed pump for sending water to the chute sprinkling shower is reduced. The purpose is to reduce.

[0006]

Means for Solving the Problems In order to achieve the above object, a sprinkler washing device for a conveyor connecting portion of the present invention is provided at a chute sprinkling shower provided at a connecting portion of a belt conveyor and at a chute sprinkling shower inlet side. Sprinkling shower control valve, cleaning shower for cleaning the return side of the upstream belt conveyor of the transfer section, recovery hopper for cleaning water, drain pit for receiving cleaning water from the recovery hopper, and draining cleaning water from the drain pit A drainage pump to be sent to the treatment equipment, a drainage control valve installed on the outlet side of the drainage pump, a communication pipe for connecting between the drainage pump and the drainage control valve, and a connection between the sprinkling shower control valve and the sprinkling shower, and a communication pipe It is provided with a communication control valve provided on the way.

Next, the operation of the present invention will be described. After confirming that there is coal on the conveyor, open the watering shower control valve and start watering the chute watering shower. After entering the steady operation, the drainage control valve is closed and the communication control valve is opened to send the wash water to the chute sprinkling shower without sending it to the wastewater treatment equipment. At this time, throttle the spray shower control valve so that the flow rate of the chute spray shower does not increase too much. Since the wash water is used for the sprinkling shower in this way, the load on the wastewater treatment device is reduced and the running cost of the wastewater treatment device is reduced. Also, since the sprinkling shower control valve is throttled, the load on the pump that sends water to the sprinkling shower is also reduced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Note that FIG. 1 is an explanatory view of a sprinkler cleaning device for a conveyor transfer section of the present invention. In FIG. 1, the same parts as those of the conventional technique described with reference to FIG. 4 are designated by the same reference numerals, and the duplicated description will be omitted.
In FIG. 1, D is a shower control valve (hereinafter referred to as valve D) that adjusts the flow rate of the chute sprinkling shower, and E is a drainage control valve (hereinafter referred to as valve E) that controls the wash water sent to the wastewater treatment device, F is a communication control valve (hereinafter referred to as valve F). Reference numeral 13 is a water source pipe. Reference numeral 14 is a coal load switch that detects whether or not there is coal on the belt conveyor 3. Reference numeral 15 is a water level gauge for detecting the lower limit water level above the drainage pit 9. Reference numeral 16 is a flow meter for detecting the flow rate of the chute sprinkling shower, which is provided on the downstream side of the valve D. Reference numeral 17 denotes a connecting pipe that connects the drainage pump 10 to the valve E and the valve D to the flowmeter 16, and a valve F is provided in the middle of the connecting pipe 17.

The operation of this embodiment will be described below with reference to FIGS.
This will be described with reference to the block diagram shown in FIG. It should be noted that the combination of FIG. 2 and FIG. 3 constitutes one block diagram, and its contacts are shown as A, B and C. First, the operating status of the belt conveyor is detected, and if it is in operation,
The presence / absence of a load on the conveyor is detected by the presence switch 14. If there is coal, detect the water level in the drainage pit 9,
If the water level is above the lower limit, the valve E is closed, the valve F is opened, the valve D is closed, and then the switch of the drainage pump 10 is turned on.
In that state, the flow rate Q _N of the sprinkling shower 2 is detected by the flow meter 16, and when the flow rate is less than the specified value, the valve D is gradually opened by one scale. When the flow rate of the sprinkling shower 2 is larger than the specified value as a result of opening the valve D, the valve D is closed by one scale. The opening of the valve D is kept constant when the flow rate Q _N is a specified value.

When there is no coal on the belt conveyor 3, the valves F and D are closed and the chute is not sprayed. When the water level in the drainage pit 9 is equal to or lower than the lower limit water level, the drainage pump 10 is stopped, the valve F is closed, the valve D is open, and shower sprinkling is performed.

As described above, in the present invention, since the cleaning water is used for the chute sprinkling shower 2, the load on the wastewater treatment equipment is reduced, and the transportation cost for sludge treatment is reduced. Decrease. Further, since the amount of water supplied from the water supply pipe 13 for sending water to the sprinkling shower 2 is reduced, clean water can be saved and the load of a pump (not shown) sent to the water supply pipe 13 is also reduced.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the present invention.

[0013]

As described above, in the sprinkler cleaning device of the conveyor connecting portion of the present invention, the conveyor cleaning wastewater is used for spouting the chute, so that the load of the wastewater treatment device is reduced and the wastewater treatment device generates the wastewater. The running cost of the plant can be reduced by reducing the transportation cost of the sludge and the amount of the coagulant used.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a sprinkler cleaning device for a conveyor transfer section of the present invention.

FIG. 2 is a block diagram illustrating the operation of the present invention.

FIG. 3 is a block diagram illustrating the operation of the present invention.

FIG. 4 is a schematic explanatory view of a conventional sprinkler cleaning device for a transfer section of a conveyor.

[Explanation of symbols]

 1 Conveyor transfer section 2 Chute sprinkling shower 3 Upstream belt conveyor 6, 6a, 6b Washing shower 7 Collection hopper 9 Drainage pit 10 Drainage pump 17 Communication pipe D Sprinkling shower control valve E Drainage control valve F Communication control valve

Claims (1)

[Claims] 1. A chute sprinkling shower provided at a transfer section of a belt conveyor, a sprinkling shower control valve provided at an entrance side of the chute sprinkling shower, and a washing shower for cleaning a return side of an upstream belt conveyor at the transfer section. , A cleaning water recovery hopper, a drainage pit that receives the cleaning water from the recovery hopper, a drainage pump that sends the cleaning water from the drainage pit to the drainage treatment device, a drainage control valve provided on the drainage pump outlet side, and a drainage pump Sprinkling of the conveyor transfer section, characterized by comprising a connecting pipe for connecting the drainage control valve and the sprinkling shower control valve to the sprinkling shower, and a connecting control valve provided in the middle of the connecting pipe. Cleaning device.