Graded washing device of filter press

Abstract

The utility model discloses a staged washing device of a filter press, which comprises the filter press and a liquid storage device, the liquid storage device comprises a washing liquid storage device, a reclaimed water storage device and a circulating liquid storage device, a water outlet of the washing liquid storage device and a water outlet of the reclaimed water storage device are both connected with a washing liquid inlet of the filter press, and a water outlet of the circulating liquid storage device is connected with a circulating liquid outlet of the filter press. A water inlet of the circulating liquid storage device and a water inlet of the washing liquid storage device are both connected with a washing liquid outlet of the filter press, and a water outlet of the circulating liquid storage device is connected with the water inlet of the washing liquid storage device through a connecting pipeline. According to the staged washing device of the filter press, the washing liquid storage device and the circulating liquid storage device are arranged, the original washing procedure is changed, and the washing liquid is subjected to multi-stage utilization, so that the use amount of reclaimed water is obviously reduced, the concentration of effective elements in the washing liquid is improved, and the economic benefits of enterprises are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of washing and impurity removal, and particularly relates to a washing device for a filter press. Background Art

[0002] The working procedure of the filter press mainly includes: feeding, pressing, washing and discharging.

[0003] In the feeding stage, the plate and frame filter press receives sludge from the upstream. The sludge is transported to the feeding port of the plate and frame filter press through pumping or pipeline transportation. In order to enable the sludge to smoothly enter the filter chamber of the plate and frame filter press, a movable door needs to be arranged at the feeding port, and the amount of sludge entering the filter chamber is controlled by controlling the opening degree and closing time of the movable door.

[0004] After the feeding stage ends, the plate and frame filter press will enter the pressing stage. In this stage, the filter plates in the filter chamber of the plate and frame filter press begin to close, squeezing the sludge together. At the same time, the pressing stage also includes the process of pressurizing and dewatering the sludge. This stage is the core part of the operation of the plate and frame filter press, because in this stage, most of the separation of solids and liquids is achieved through pressing and filtration.

[0005] After the pressing stage ends, the plate and frame filter press enters the washing stage. In this stage, washing water is injected into the filter chamber through the washing port of the plate and frame filter press to wash the filter cake. The purpose of washing is to remove the residual liquid and pollutants in the filter cake and improve the quality of the filter cake. During the washing process, the amount of washing water used and the washing time need to be determined according to the specific sludge characteristics and treatment requirements.

[0006] After the washing stage ends, the filter plates in the filter chamber of the plate and frame filter press begin to open, discharging the already filtered filter cake from the filter chamber. For the convenience of cleaning and maintenance, a discharge port is usually arranged at the bottom of the plate and frame filter press, and the discharge of the filter cake is achieved by controlling the opening and closing of the discharge port.

[0007] Currently, the common washing process is that the workshop directly washes the filter cake with reclaimed water such as intermediate water and condensate water to remove impurities in the filter cake or wash out the effective elements from the filter cake to avoid waste. The washing water consumption for a single filter press per single time can reach 15m 3 , for an enterprise with a large processing volume, more than 40 filter press operations need to be carried out every day, and the corresponding washing water consumption is as high as 600m 3 / d, resulting in a relatively high loss of reclaimed water. Summary of the Utility Model

[0008] The technical problem to be solved by the utility model is to overcome the above-mentioned deficiencies and defects in the background art, and provide a filter press grading washing device that saves water resources and is more conducive to the recycling of beneficial elements.

[0009] To solve the above technical problems, the technical solution proposed by the present utility model is as follows:

[0010] A filter press grading washing device, comprising a filter press and a liquid storage device. The liquid storage device includes a washing liquid storage device, a reclaimed water storage device, and a circulating liquid storage device. The water outlet of the washing liquid storage device and the water outlet of the reclaimed water storage device are both connected to the washing liquid inlet of the filter press. The water inlet of the circulating liquid storage device and the water inlet of the washing liquid storage device are both connected to the washing liquid outlet of the filter press. A connecting pipe is provided between the water outlet of the circulating liquid storage device and the water inlet of the washing liquid storage device, and a circulating liquid detection component for detecting the properties of the washing liquid is provided at the water outlet of the circulating liquid storage device.

[0011] In the above filter press grading washing device, preferably, the washing liquid inlet of the filter press is provided with a first branch and a second branch. A washing liquid feed valve is provided on the first branch, and the washing liquid feed valve is connected to the washing liquid storage device. A reclaimed water feed valve is provided on the second branch, and the reclaimed water feed valve is connected to the reclaimed water storage device. The washing liquid outlet of the filter press is provided with a third branch and a fourth branch. A washing liquid discharge valve is provided on the third branch, and the washing liquid discharge valve is connected to the circulating storage device. A reclaimed water discharge valve is provided on the fourth branch, and the reclaimed water discharge valve is connected to the washing liquid storage device. The filter press can adopt conventional equipment in the prior art, and a plate and frame filter press can be used, but it is not limited to the plate and frame filter press. The washing liquid feed valve can control the washing liquid in the washing liquid storage device to enter the filter press for washing. After washing, the washing liquid discharge valve is opened, and the liquid enters the circulating liquid storage device for storage. The reclaimed water feed valve can control the reclaimed water in the reclaimed water storage device to enter the filter press for washing. After washing, the reclaimed water discharge valve is opened, and the liquid enters the washing liquid storage device. The liquid after washing the filter press can enter the washing liquid storage device or the circulating liquid storage device for direct or indirect use in the next washing process, avoiding the waste of water resources caused by the direct discharge of the washing liquid.

[0012] In the above filter press grading washing device, preferably, the washing liquid storage device includes a washing liquid tank and a washing liquid pump. The outlet of the washing liquid tank is connected to the inlet of the washing liquid pump. The outlet of the washing liquid pump is connected to the washing liquid feed valve through a first pipe. The inlet of the washing liquid tank is connected to the reclaimed water discharge valve through a second pipe. The washing liquid tank is used to store the washing liquid required during the washing process. The washing liquid pump can increase the pressure of the washing liquid in the washing liquid tank to ensure that the washing liquid can smoothly enter the filter press along the first pipe. The reclaimed water discharge valve can control the liquid after washing with reclaimed water to enter the washing liquid tank through the second pipe for direct use in the next washing process.

[0013] In the above-mentioned filter press grading washing device, preferably, the intermediate water storage device includes an intermediate water tank and an intermediate water pump. The outlet of the intermediate water tank is connected to the inlet of the intermediate water pump, and the outlet of the intermediate water pump is connected to the intermediate water feed valve through a third pipeline. The intermediate water tank is used to store the intermediate water required for the washing process, and the intermediate water pump can increase the pressure of the intermediate water in the intermediate water tank to ensure that the intermediate water can enter the filter press along the third pipeline.

[0014] In the above-mentioned filter press grading washing device, preferably, the circulating liquid storage device includes a circulating liquid tank and a circulating liquid pump. The outlet of the circulating liquid tank is connected to the inlet of the circulating liquid pump, and the outlet of the circulating liquid pump is connected to the water inlet of the washing liquid storage device through the connecting pipeline. A circulating liquid discharge valve is provided on the connecting pipeline, and the water inlet of the circulating liquid tank is connected to the washing liquid discharge valve through a fourth pipeline. The washing liquid discharge valve can control the circulating liquid generated after the washing liquid is washed to flow into the circulating liquid tank for storage. The circulating liquid pump can be used to increase the pressure of the circulating liquid in the circulating liquid tank to ensure that the circulating liquid smoothly enters the connecting pipeline or the concentration device. The circulating liquid discharge valve can control whether the circulating liquid flows into the washing liquid storage device. The circulating liquid generated after the washing liquid is washed is temporarily stored in the washing liquid tank, and when appropriate (after the circulating liquid detection component detects that the circulating liquid is qualified), the circulating liquid is then transported into the washing liquid storage device for storage, and the washing liquid is recycled, avoiding the waste of water resources caused by the direct discharge of the washing liquid.

[0015] In the above-mentioned filter press grading washing device, preferably, the circulating liquid detection component includes one or more of a density meter, a conductivity meter, a pH detector, an ORP detector, or a COD on-line analyzer. The circulating liquid detection component can detect data such as the density of ions in the washing liquid, the conductivity of the solution, the pH value, the oxidation-reduction potential of the solution, and the COD value. A threshold value can be preset according to the properties of different circulating liquid detection components. When the detection value of the detection component is less than the threshold value, the circulating liquid is controlled to flow into the washing liquid storage device for use in the next washing process. When the detection value of the detection component is greater than or equal to the preset threshold value, the circulating liquid is controlled to flow to the next process, and the next process here can be direct discharge or further processing in a concentration device, which can be further adjusted according to the actual needs of the enterprise.

[0016] In the above-mentioned filter press grading washing device, preferably, it further includes a concentration device for concentrating the washing liquid to obtain a product and evaporation liquid. The concentration device is connected to the circulating liquid storage device and the intermediate water storage device. The concentration device can be used to concentrate the circulating liquid in the circulating liquid storage device to obtain filtrate and evaporation liquid. The filtrate can be used for further processing to extract the effective elements required by the enterprise, and the evaporation liquid is further processed to obtain intermediate water and enter the intermediate water storage device, providing the intermediate water resources required during the washing process and reducing the waste of reclaimed water.

[0017] In the above-mentioned filter press grading washing device, preferably, the concentration device includes a concentration tank, a product recovery device, and a medium water regeneration device for collecting evaporation liquid. The product recovery device and the medium water regeneration device are both connected to the concentration tank. The concentration tank is connected to the outlet of the circulating liquid storage device through a fifth pipeline, and a concentration device feed valve is provided on the fifth pipeline. The outlet of the medium water regeneration device is connected to the inlet of the medium water storage device through a sixth pipeline. The concentration device feed valve can control the unqualified circulating liquid detected by the circulating liquid detection component to enter the concentration tank. The circulating liquid is concentrated in the concentration tank to obtain filtrate and evaporation liquid. At this time, the concentration of the effective element in the filtrate increases, which is more conducive to the purification of the effective element; the evaporation liquid can be processed by the medium water regeneration device to obtain medium water, and the medium water can enter the medium water tank through a seventh pipeline to provide the medium water required for the washing process, reducing the consumption of recycled water to a certain extent.

[0018] Compared with the prior art, the advantages of the present utility model are as follows:

[0019] The filter press grading washing device of the present utility model, on the premise of meeting the same washing effect and washing rhythm, by adding a washing liquid storage device and a circulating liquid storage device to the original washing program, changes the original one-time washing only with recycled water to multi-program washing in batches and grades, reducing the usage amount of washing water by at least 50%, and significantly reducing the usage amount of recycled water of the enterprise.

[0020] The filter press grading washing device of the present utility model, through the adjustment of the washing program, increases the concentration of the effective element in the washing liquid and reduces the loss of the effective element. For the process of extracting the effective element that requires obtaining filtrate during the filter pressing process, the benefit of grading washing will be further improved. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the filter press grading washing device of the present utility model.

[0023] Legend Explanation

[0024] 1. Filter press; 101. Washing liquid feed valve; 102. Reclaimed water feed valve; 103. Washing liquid discharge valve; 104. Reclaimed water discharge valve; 2. Circulating liquid detection component; 3. Washing liquid tank; 4. Washing liquid pump; 5. Reclaimed water tank; 6. Reclaimed water pump; 7. Circulating liquid tank; 8. Circulating liquid pump; 801. Circulating liquid discharge valve; 802. Concentrating device feed valve; 9. Concentrating tank; 10. Product recovery device; 11. Reclaimed water regeneration device; 111. Connecting pipe; 112. First pipe; 113. Second pipe; 114. Third pipe; 115. Fourth pipe; 116. Fifth pipe; 117. Sixth pipe. Detailed implementation

[0025] To facilitate the understanding of the present utility model, the following will describe the present utility model more comprehensively and meticulously in conjunction with the specification drawings and preferred embodiments, but the protection scope of the present utility model is not limited to the following specific embodiments.

[0026] It should be particularly noted that when an element is described as "fixed to, fixedly connected to, connected to, or communicated with" another element, it can be directly fixed, fixedly connected, connected, or communicated to the other element, or indirectly fixed, fixedly connected, connected, or communicated to the other element through other intermediate connectors.

[0027] Unless otherwise defined, all professional terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present utility model.

[0028] Unless otherwise specifically stated, various raw materials, reagents, instruments, and equipment used in the present utility model can be obtained through market purchases or can be prepared by existing methods.

[0029] Embodiment:

[0030] As Figure 1 shown, the filter press grading washing device of this embodiment includes a filter press 1 and a liquid storage device. The liquid storage device includes a washing liquid storage device, a reclaimed water storage device, and a circulating liquid storage device. The water outlet of the washing liquid storage device and the water outlet of the reclaimed water storage device are both connected to the washing liquid inlet of the filter press 1. The water inlet of the circulating liquid storage device and the water inlet of the washing liquid storage device are both connected to the washing liquid outlet of the filter press 1. A connecting pipe 111 is provided between the water outlet of the circulating liquid storage device and the water inlet of the washing liquid storage device, and a circulating liquid detection component 2 for detecting the properties of the washing liquid is provided at the water outlet of the circulating liquid storage device.

[0031] In this embodiment, the washing liquid inlet of the filter press 1 is provided with a first branch and a second branch. A washing liquid feed valve 101 is provided on the first branch, and the washing liquid feed valve 101 is connected to the washing liquid storage device. A reclaimed water feed valve 102 is provided on the second branch, and the reclaimed water feed valve 102 is connected to the reclaimed water storage device. The washing liquid outlet of the filter press 1 is provided with a third branch and a fourth branch. A washing liquid discharge valve 103 is provided on the third branch, and the washing liquid discharge valve 103 is connected to the circulation storage device. A reclaimed water discharge valve 104 is provided on the fourth branch, and the reclaimed water discharge valve 104 is connected to the washing liquid storage device.

[0032] In this embodiment, the washing liquid storage device includes a washing liquid tank 3 and a washing liquid pump 4. The outlet of the washing liquid tank 3 is connected to the inlet of the washing liquid pump 4. The outlet of the washing liquid pump 4 is connected to the washing liquid feed valve 101 through a first pipeline 112. The inlet of the washing liquid tank 3 is connected to the reclaimed water discharge valve 104 through a second pipeline 113.

[0033] In this embodiment, the reclaimed water storage device includes a reclaimed water tank 5 and a reclaimed water pump 6. The outlet of the reclaimed water tank 5 is connected to the inlet of the reclaimed water pump 6. The outlet of the reclaimed water pump 6 is connected to the reclaimed water feed valve 102 through a third pipeline 114.

[0034] In this embodiment, the circulating liquid storage device includes a circulating liquid tank 7 and a circulating liquid pump 8. The outlet of the circulating liquid tank 7 is connected to the inlet of the circulating liquid pump 8. The outlet of the circulating liquid pump 8 is connected to the water inlet of the washing liquid storage device through a connecting pipeline 111. A circulating liquid discharge valve 801 is provided on the connecting pipeline 111. The water inlet of the circulating liquid tank 7 is connected to the washing liquid discharge valve 103 through a fourth pipeline 115.

[0035] In this embodiment, the circulating liquid detection assembly 2 includes one or more of a density meter, a conductivity meter, a pH detector, an ORP detector, or a COD on-line analyzer. Specifically, one or more of them can be used in combination in this embodiment. For example, one conductivity meter can be used, or a conductivity meter and a COD on-line analyzer can be used in combination.

[0036] In this embodiment, a concentration device for concentrating the washing liquid to obtain a product and evaporation liquid is further included. The concentration device is connected to the circulating liquid storage device and the reclaimed water storage device.

[0037] In this embodiment, the concentration device includes a concentration tank 9, a product recovery device 10, and a reclaimed water regeneration device 11 for collecting evaporation liquid. The product recovery device 10 and the reclaimed water regeneration device 11 are both connected to the concentration tank 9. The concentration tank 9 is connected to the outlet of the circulating liquid storage device through a fifth pipeline 116. A concentration device feed valve 802 is provided on the fifth pipeline 116. The outlet of the reclaimed water regeneration device 11 is connected to the inlet of the reclaimed water storage device through a sixth pipeline 117.

[0038] In this embodiment, the filter press 1 can be a plate and frame filter press. A specific washing process is introduced as follows: Two-stage washing is adopted. When the washing program of the filter press 1 is started, the washing liquid inlet valve 101 and the washing liquid discharge valve 103 of the filter press 1 are interlocked and opened. The washing liquid pump 4 is started, and the washing liquid in the washing liquid tank 3 is transported through the first pipeline 112 into the filter press 1 for washing. After washing, the liquid enters the circulating liquid tank 7 for storage through the fourth pipeline 115. After washing for 320 s, the washing liquid pump 4, the washing liquid inlet valve 101 and the washing liquid discharge valve 103 are interlocked and closed; then the intermediate water inlet valve 102 and the intermediate water discharge valve 104 for entering the filter press 1 are interlocked and opened, and the intermediate water pump 6 is started. The intermediate water in the intermediate water tank 5 is transported through the third pipeline 114 into the filter press 1 for washing. After the intermediate water washing, the liquid enters the washing liquid tank 3 for storage through the second pipeline 113. After washing for 320 s, the intermediate water pump 6, the intermediate water inlet valve 102 and the intermediate water discharge valve 104 are interlocked and closed. When the next washing program of the filter press 1 is started, the above operations are repeated.

[0039] In this embodiment, a circulating liquid detection component 2 is arranged on the outlet pipeline of the circulating liquid pump 8. Different circulating liquid detection components 2 can be selected according to the properties of the circulating liquid, and the threshold value of the circulating liquid detection component 2 is preset; when the circulating liquid pump 8 is started, the circulating liquid detection component 2 detects the circulating liquid. When the detected value reaches the upper limit of the preset threshold value, the concentrated device feed valve 802 is interlocked and opened, and the circulating liquid discharge valve 801 is closed. The circulating liquid flows through the fifth pipeline 116 into the concentration tank 9. The concentration tank 9 further processes the circulating liquid to obtain filtrate and evaporation liquid. The filtrate enters the product recovery device 10 for recycling, and the evaporation liquid enters the intermediate water regeneration device 11 to be processed into intermediate water. The generated intermediate water can enter the intermediate water tank 5 through the sixth pipeline 117 for reuse, reducing the consumption of regenerated water; when the detected value does not reach the upper limit of the preset threshold value, the circulating liquid discharge valve 801 is interlocked and opened, and the concentrated device feed valve 802 is closed. The circulating liquid returns to the washing liquid tank 3 through the connecting pipeline 111 for reuse, further reducing the consumption of regenerated water.

[0040] The present utility model evenly distributes the original washing time to each stage, so that for the process with relatively frequent use of the filter press, it has no impact on the operation rhythm of the filter press and can ensure the washing efficiency.

[0041] The point to be protected by the present utility model is the concept of staged washing. Only one implementation method is disclosed in this embodiment, that is, changing the original one-time washing to two-time washing. However, similar multi-stage washing methods such as three-stage, four-stage and above should belong to the concept extension of the present utility model and should be protected as the invention point. When multi-stage washing is adopted, except for the last washing using intermediate water, the previous multiple washings all use the washing liquid in the washing liquid tank 3.

[0042] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A filter press grading washing device, comprising a filter press (1) and a liquid storage device, characterized in that: The liquid storage device comprises a washing liquid storage device, a grey water storage device and a circulating liquid storage device; the water outlet of the washing liquid storage device and the water outlet of the grey water storage device are both connected to the washing liquid inlet of the filter press (1); the water inlet of the circulating liquid storage device and the water inlet of the washing liquid storage device are both connected to the washing liquid outlet of the filter press (1); a connecting pipe (111) is provided between the water outlet of the circulating liquid storage device and the water inlet of the washing liquid storage device; and a circulating liquid detection component (2) for detecting the properties of the washing liquid is provided at the water outlet of the circulating liquid storage device.

2. The filter press grading washing device according to claim 1, characterized in that: The washing liquid inlet of the filter press (1) is provided with a first branch and a second branch, the first branch is provided with a washing liquid feed valve (101), the washing liquid feed valve (101) is connected to a washing liquid storage device, the second branch is provided with a reclaimed water feed valve (102), the reclaimed water feed valve (102) is connected to the reclaimed water storage device, the washing liquid outlet of the filter press (1) is provided with a third branch and a fourth branch, the third branch is provided with a washing liquid discharge valve (103), the washing liquid discharge valve (103) is connected to a circulation storage device, the fourth branch is provided with a reclaimed water discharge valve (104), the reclaimed water discharge valve (104) is connected to the washing liquid storage device.

3. The filter press grading washing device according to claim 2, characterized in that: The washing liquid storage device comprises a washing liquid tank (3) and a washing liquid pump (4), the outlet of the washing liquid tank (3) is connected to the inlet of the washing liquid pump (4), the outlet of the washing liquid pump (4) is connected to the washing liquid feed valve (101) via a first pipe (112), and the inlet of the washing liquid tank (3) is connected to the reclaimed water discharge valve (104) via a second pipe (113).

4. The filter press grading washing device according to claim 2, characterized in that: The grey water storage device comprises a grey water tank (5) and a grey water pump (6), the outlet of the grey water tank (5) being connected to the inlet of the grey water pump (6), and the outlet of the grey water pump (6) being connected to the grey water feed valve (102) via a third pipe (114).

5. The filter press grading washing device according to claim 2, characterized in that: The circulating liquid storage device comprises a circulating liquid tank (7) and a circulating liquid pump (8); the outlet of the circulating liquid tank (7) is connected to the inlet of the circulating liquid pump (8); the outlet of the circulating liquid pump (8) is connected to the water inlet of the washing liquid storage device via the connecting pipe (111); a circulating liquid discharge valve (801) is provided on the connecting pipe (111); and the water inlet of the circulating liquid tank (7) is connected to the washing liquid discharge valve (103) via a fourth pipe (115).

6. The filter press grading washing device according to any one of claims 1 to 5, characterized in that: The circulating liquid detection component (2) comprises one or more of a density meter, a conductivity meter, a pH detector, an ORP detector or a COD online meter.

7. The filter press grading washing device according to any one of claims 1 to 5, characterized in that: It also includes a concentration device for concentrating the washing liquid to obtain a product and an evaporation liquid, and the concentration device is connected to the circulating liquid storage device and the intermediate water storage device.

8. The filter press grading washing device according to claim 7, characterized in that: The concentrating device comprises a concentrating tank (9), a product recovery device (10) and a reclaimed water regeneration device (11) for collecting evaporated liquid. The product recovery device (10) and the reclaimed water regeneration device (11) are both connected to the concentrating tank (9). The concentrating tank (9) is connected to the outlet of the circulating liquid storage device via a fifth pipeline (116). A concentrating device feed valve (802) is provided on the fifth pipeline (116). The outlet of the reclaimed water regeneration device (11) is connected to the inlet of the reclaimed water storage device via a sixth pipeline (117).

Images