JP3072638U - Stock solution supply device in filter press - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To efficiently perform solid-liquid separation in high-concentration hardly dewaterable mud such as construction mud using a filter press. SOLUTION: A pressure detecting means 12 for detecting a pressure for feeding a stock solution to be supplied to a filter press 9 is provided. The pump switching means 14 switches the raw liquid pumping means 5 from the spiral pump 18 to the positive displacement pump 16.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an undiluted liquid supply device for a filter press that performs solid-liquid separation of high-concentration hardly dewaterable mud such as construction mud.

[0002]

[Prior art]

 Conventionally, when a filter press is used for dewatering muddy water, a pump is used to pump the undiluted solution using a positive displacement pump such as a centrifugal pump or a diaphragm pump or a single screw pump. Filtration is performed by a positive displacement pump.

[0003]

[Problems to be solved by the invention]

 However, the centrifugal pump has a problem that wear is remarkable and electric power is wasted especially in a high-pressure small flow rate region at the end of dehydration.

[0004] On the other hand, many positive displacement pumps have a small capacity, and there is a problem that a long time is required for dehydration. Large capacity positive displacement pumps are structurally difficult to manufacture and the cost of the body and consumables is high. Even if a spiral pump is used only for filling the filtration chamber, it is difficult to shorten the filtration time.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and provides a stock solution supply device for a filter press that can efficiently perform solid-liquid separation by a filter press. It is intended to be.

[0006]

[Means for Solving the Problems]

 The present invention has solved the above-mentioned problem as follows. (1) By feeding a stock solution containing mud, etc. between filter cloths of adjacent filter plates, the stock solution is dewatered to perform a solid-liquid separation in a stock solution supply device in a filter press. Flow rate detection means for detecting the flow rate of water per unit time; raw liquid pressure feeding means comprising a spiral pump and a squeeze type positive displacement pump; and a flow rate value detected by the flow rate detection means lower than a preset value. Switching means for switching the undiluted solution pumping means from a spiral pump to a squeeze-type positive displacement pump.

(2) In a stock solution supply device in a filter press in which a stock solution containing mud and the like is pumped between filter cloths of adjacent filter plates to dewater the stock solution and perform solid-liquid separation, A flow rate detecting means for detecting an integrated flow rate of the undiluted solution or the filtrate, a undiluted solution pumping means comprising a spiral pump and a squeeze type positive displacement pump, and a flow rate value detected by the flow rate detecting means is a preset value. Switching means for switching the undiluted solution pumping means from a spiral pump to a squeeze type positive displacement pump when the pressure reaches a predetermined value.

[0008]

[Embodiment of the invention]

 Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a conceptual diagram of a filter press to which an embodiment of a stock solution supply device in a filter press of the present invention is applied. For example, a high-concentration hardly dewaterable mud such as construction mud is dewatered. This is for obtaining a dehydrated cake.

As shown in FIG. 1, a stock solution of sludge is sent from a pipe (2) to an intake tank (3) by a pump (1). A flocculant is fed into the intake tank (3) from a pipe (not shown) and is stirred by the agitator (4). The undiluted solution is further sent to the filter press (9) from the pipeline at the bottom of the intake tank (3) through the three-way valve (7) and the pipelines (6) and (8) by the undiluted solution pumping means (5). You.

In the present embodiment, a squeeze-type positive displacement pump (16) and a spiral pump (18) are selectively used as the undiluted liquid pumping means (5).

FIG. 2 is a block diagram showing a circuit configuration of the stock solution supply control device of the filter press shown in FIG. As shown in FIG. 2, the control system of the filter press (9) of the present embodiment includes a comparison means (10), a pressure detection means (12), a flow rate detection means (20), and a pump switching means (14). ).

The pressure detecting means (12) is disposed at the inlet of the undiluted solution of the filter press (9), and sequentially detects the pressure (Px) of the undiluted solution supplied to the filter press (9).

[0014] The flow rate detecting means (20) is provided at the inlet of the undiluted solution of the filter press, and detects the flow rate of the undiluted solution per unit time.

The comparing means (10) compares the detected value of the flow rate detecting means (20) with a preset value.

The pump switching means (14) determines, based on the comparison result by the comparing means (10), that the detection value of the flow rate detection means (20) is larger than or equal to a preset value. In such a case, control is performed so as to use a centrifugal pump (18), and to switch to a squeeze-type positive displacement pump (16) when the detected value falls below a set value.

Next, the operation of the present embodiment configured as described above will be described.

First, the flow rate per unit time of the stock solution supplied to the filter press (9) is detected by the flow rate detecting means (20), and the detection result is input to the comparing means (10).

In the comparing means (10), the detection result is compared with the set flow rate, and when the detected flow rate is larger than or equal to the set flow rate, the undiluted solution is filtered by the centrifugal pump (18). Continue to supply to 9). That is, the filling of the filter chamber and the supply of the undiluted solution under the low pressure during the first half or the first half of the dehydration are performed by the spiral pump (18), which is desirably used at a low pressure and a large flow rate.

On the other hand, when the detected flow rate is smaller than the set flow rate, a switching signal is output from the comparison means (10) to the pump switching means (14), and the pump is moved from the spiral pump (18) to the positive displacement pump. To the pump (16). That is, under the high pressure in the latter or latter half of the dehydration, the supply of the stock solution is performed by the squeeze-type positive displacement pump (16) suitable for use at a high pressure and a small flow rate.

As described above, according to the present embodiment, the centrifugal pump (18) characterized by the low pressure and the large flow rate and the high pressure and the small flow rate are controlled in accordance with the supply amount of the stock solution per unit time in the filter press (9). Among the characteristic squeeze-type positive displacement pumps (16), the most suitable pump is switched. Therefore, the stock solution can be supplied to the filter press (9) in an optimum state while covering the drawbacks of both types of pumps, and the solid-liquid separation can be performed efficiently.

It is known that the pumping of the stock solution at a high flow rate in the low pressure region and the pumping of the stock solution at a low flow rate in the high pressure region have a high dehydration efficiency. Therefore, according to the present embodiment, Thus, efficient dehydration becomes possible.

In addition, instead of providing the above-described flow rate detecting means (20) at the inlet of the undiluted solution of the filter press, it is provided at a discharge pipe (not shown) of the filtrate discharged from the filter press, and the flow rate per unit time of the filtrate is determined. Even if the pump is switched from a spiral pump to a squeeze-type positive displacement pump when the flow rate becomes lower than the set value, almost the same effect can be obtained.

Further, the above-mentioned flow rate detecting means (20) can be an integrating type flow rate detecting means for integrating the flow rate of the stock solution supplied to the filter press from the start of the measurement. In this case, the undiluted solution is pumped to the filter press by a vortex pump until the accumulated flow reaches the set value, and when the accumulated flow exceeds the set value, this is detected by the comparison means. Then, the pump to be used is switched from the spiral pump to the squeeze-type positive displacement pump by the pump switching means.

[0025]

[Effect of the invention]

 According to the present invention, the following effects can be obtained. (a) According to the invention of claim 1, in the first stage of dehydration having a small filtration resistance, the undiluted solution is pumped by a vortex pump suitable for low-pressure, large-flow pumping. Since the stock solution is pumped by a squeeze-type positive displacement pump suitable for pumping, efficient solid-liquid separation can be performed and the filtration time can be reduced.

When the flow rate of the undiluted solution or filtrate falls below a set value, the pump is switched from a spiral type pump to a positive displacement type pump. Regardless, the switching timing of the pump can be appropriately controlled, and the processing efficiency can be improved.

(B) According to the invention of claim 2, when the integrated flow rate of the undiluted solution or the filtrate reaches the set value, the pump is switched from the spiral pump to the positive displacement pump. Can be calculated and determined in advance based on the processing capacity of the filter press, the properties of the stock solution, and the like, which is convenient for automatic control.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of one embodiment of a stock solution supply device in a filter press of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of a stock solution supply control system.

[Explanation of symbols]

 (1) Pump (2) Pipe (3) Intake tank (4) Agitator (5) Means for feeding undiluted solution (6) Pipe (7) Three-way valve (8) Pipe (9) Filter press (10) Comparison means ( 12) Pressure detecting means (14) Pump switching means (16) Positive displacement pump (18) Spiral pump (20) Flow rate detecting means

 ──────────────────────────────────────────────────続 き Continued on the front page (73) Utility model holder 000006655 Nippon Steel Corporation 2-3-6 Otemachi, Chiyoda-ku, Tokyo (73) Utility model holder 000150110 Takenaka engineering works Ginza, Chuo-ku, Tokyo 8-21-1, (73) Utility model holder 000219406 Toa Construction Industry Co., Ltd., 5th, Yonbancho, Chiyoda-ku, Tokyo (73) Utility model holder 000222668 Toyo Construction Co., Ltd. 4-1-1 Komyobashi, Chuo-ku, Osaka-shi, Osaka No. 1 (73) Utility model holder 592180225 Narazaki Manufacturing Co., Ltd. 385, Sakimori-cho, Muroran-shi, Hokkaido (73) Utility model holder 592251673 Rinkai Construction Co., Ltd. 2-3-8 Shiba, Minato-ku, Tokyo (72) Inventor Yuichi Toya 2-15-6 Otsuka, Bunkyo-ku, Tokyo NISSE I Otowa Building 4F Inside the Advanced Construction Technology Center (72) Inventor Isao Kanazawa Higashi 2-15-6 Otsuka, Bunkyo-ku, Tokyo Nisse I Otowa Building 4F Inside the Advanced Construction Technology Center (72) Inventor Takashi Hamano 4-15Nisse I-Otowa Building 4F, Otsuka 2-chome, Bunkyo-ku, Tokyo Inside the Technology Center (72) Inventor Kiyomi Sasaki 2-15-6 Otsuka, Bunkyo-ku, Tokyo Nisse I Otowa Building 4F Inside the Advanced Construction Technology Center (72) Inventor Kuniomi Saito 1-chome, Yamashita, Okayama City, Okayama Prefecture No. 1-13 Omotogumi Co., Ltd. (72) Katsuhiko Ito 2-3-11 Kanda Surugadai, Chiyoda-ku, Tokyo 2-3-1 Konoike Gumi Co., Ltd. 59 Nippon Steel Corporation Engineering Business Unit (72) Inventor Akira Morishima 8-21-1, Ginza, Chuo-ku, Tokyo Co., Ltd.Takenaka Civil Engineering Co., Ltd. (72) Inventor Tetsuichi Okada Yonbancho, Chiyoda-ku, Tokyo 5. Toa Construction Industry Co., Ltd. (72) Inventor Ryu Kawanishi I 4-1-1 Komyobashi, Chuo-ku, Osaka-shi Toyo Construction Co., Ltd. (72) Inventor Katsuhiro Seino 385 Sakimori-cho, Muroran-shi Narasaki Manufacturing Co., Ltd. (72) Inventor Nobuo Yamazaki 1-5 Shiba, Minato-ku, Tokyo -9 Rinkai Construction Co., Ltd., 3F, Building 2 of Sumitomo Real Estate Shiba Building

Claims (2)

[Utility model registration claims] 1. An undiluted solution supply device in a filter press in which a undiluted solution containing mud and the like is pressure-fed between filter cloths of adjacent filter plates to dehydrate the undiluted solution and perform solid-liquid separation. Flow rate detecting means for detecting the flow rate of water per unit time; raw liquid pressure feeding means comprising a spiral type pump and a squeeze type positive displacement pump; and a flow rate value detected by the flow rate detecting means falls below a preset value. And a switching means for switching the undiluted solution pumping means from a spiral type pump to a squeeze type positive displacement pump. 2. A stock solution supply device in a filter press in which a stock solution containing mud or the like is pressure-fed between filter cloths of adjacent filter plates to dehydrate the stock solution and perform solid-liquid separation. Flow rate detecting means for detecting an integrated flow rate of water,
A stock pump comprising a centrifugal pump and a squeeze-type positive displacement pump; and a flow rate value detected by the flow rate detector reaching a preset value, whereby the stock pump is moved from the centrifugal pump to a squeeze type volumetric pump. A feed unit for a filter press, comprising: switching means for switching to a mold pump.