A filter device for use in a triple-effect evaporation system

Abstract

This utility model discloses a filtration device used in a triple-effect evaporation system, including a three-way valve (1), a three-way connector (2), and two filters (3) with different filtration accuracies. The inlets of the two filters (3) are respectively connected to the two outlets of the three-way valve (1). A water inlet pipe (4) is connected to the inlet of the three-way valve (1), and a water pump (5) is installed on the water inlet pipe (4). The outlets of the two filters (3) are respectively connected to two ports of the three-way connector (2), and a drain pipe (6) is installed on the other port of the three-way connector (2). A one-way valve (7) is installed between the three-way connector (2) and the outlet of the filter (3). A water flow meter (8) with an alarm function is installed on the drain pipe (6). This utility model has the advantage of good performance.

Description

Technical Field

[0001] This invention relates to the field of triple-effect evaporation systems, and particularly to a filtration device used in triple-effect evaporation systems. Background Technology

[0002] Triple-effect evaporation systems are widely used in the wastewater treatment industry. They employ a multi-stage evaporation effect, including high-efficiency, low-efficiency, and ultra-low-efficiency evaporators. Each subsequent evaporator fully utilizes the waste heat transferred from the previous stage for heating and evaporation, achieving a multi-stage evaporation process. Wastewater is sequentially heated and evaporated in different stages of the evaporator, using high-temperature steam. The steam then cools and condenses, concentrating the wastewater and precipitating a large amount of crystalline salt. This concentrated wastewater then enters a cloth filter, where the crystalline salt is separated from the water and recovered. The filtration accuracy of the filter is determined by the filter cloth specifications.

[0003] For wastewater treatment companies, the types of wastewater obtained from different channels vary, and the size of the crystalline salt particles in the concentrated wastewater will also vary. Currently, triple-effect evaporation systems are equipped with a fixed filter. When the crystalline salt particles are large, the filter is prone to clogging, resulting in a decrease in wastewater treatment efficiency. When the crystalline salt particles are fine, the filter's interception efficiency is low, and more crystalline salt can still pass through the filter, resulting in low crystalline salt recovery efficiency. At the wastewater treatment site, it is impossible to select a filter with the appropriate filtration precision according to the type of wastewater, resulting in poor performance. Utility Model Content

[0004] The purpose of this invention is to provide a filtration device for use in a triple-effect evaporation system. This invention has the advantage of better performance.

[0005] The technical solution of this utility model is as follows: A filtration device used in a triple-effect evaporation system includes a three-way valve, a three-way connector, and two filters with different filtration accuracies. The inlets of the two filters are respectively connected to the two outlets of the three-way valve. A water inlet pipe is connected to the inlet of the three-way valve, and a water pump is installed on the water inlet pipe. The outlets of the two filters are respectively connected to two ports of the three-way connector, and a drain pipe is installed on the other port of the three-way connector.

[0006] In the aforementioned triple-effect evaporation system, a one-way valve is provided between the three-way connector and the outlet of the filter.

[0007] In the aforementioned triple-effect evaporation system, the filtration device is equipped with a water flow meter with an alarm function on the drain pipe.

[0008] In the aforementioned triple-effect evaporation system, the filtration device further includes a control mechanism, which includes a controller. The three-way valve and the water flow meter are both connected to the controller.

[0009] In the aforementioned triple-effect evaporation system, the filter includes a cylindrical shell with a cylinder inside. The lower end of the cylinder is fixed to the bottom of the shell, and the upper end of the cylinder is provided with an annular partition fixed to the shell. A filter cartridge made of filter cloth is provided inside the cylinder, with the upper end of the filter cartridge extending beyond the cylinder. The cylinder is provided with multiple through holes corresponding to the positions of the filter cartridge. A valve is provided at the bottom of the shell and is located inside the cylinder. The inlet and outlet of the filter are located on the side wall of the shell and are respectively located on the upper and lower sides of the annular partition.

[0010] In the aforementioned triple-effect evaporation system, the filter cartridge has an annular inner clamping plate on its inner side and an annular outer clamping plate on its outer side. The outer clamping plate is connected to the inner clamping plate with screws. The outer clamping plate is located on the upper side of the annular partition, and the lower end of the inner clamping plate is inserted into the cartridge body.

[0011] In the aforementioned triple-effect evaporation system, the filter cartridge has an annular positioning ring on the inner side of its lower end.

[0012] In the aforementioned triple-effect evaporation system, the filter cartridge has a lifting rod on its inner side, and a drive unit connected to the lifting rod is provided on the top of the housing. The lifting rod has multiple conical scrapers made of flexible material. The middle part of the scraper is fixed to the lifting rod, and the thickness of the scraper gradually decreases from the middle to the edge. The scraper has multiple holes.

[0013] Compared with the prior art, this utility model uses two filters with different filtration precisions. The filter with the corresponding filtration precision can be selected according to the type of wastewater. This not only reduces filter clogging but also improves the recovery efficiency of crystallized salt, resulting in better performance. Furthermore, when recovering crystallized salt from one filter, the wastewater can pass through the other filter, which is beneficial for the continuous production of the triple-effect evaporation system and further improves the performance.

[0014] When a certain amount of crystalline salt is recovered in the filter, the water flow rate from the drain pipe decreases. By installing a water flow meter with an alarm function on the drain pipe, workers can be informed in a timely manner and the filter can be treated to ensure that the filtration efficiency meets the standard, that is, the sewage treatment efficiency meets the standard.

[0015] Furthermore, considering the characteristics of the triple-effect evaporation system—fast wastewater treatment speed and large crystallization salt production—this invention further improves the filter. The improved filter has a simple structure, is not easily clogged, requires low maintenance frequency, and allows crystallization salt to be collected at the bottom by a scraper for centralized discharge, making discharge convenient. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the filter structure in Example 3.

[0018] Figure 3 This is a top view of the scraper.

[0019] The labels in the attached diagram are as follows: 1-Three-way valve, 2-Three-way connector, 3-Filter, 4-Inlet pipe, 5-Water pump, 6-Drain pipe, 7-Check valve, 8-Flow meter, 9-Housing, 10-Cylinder, 11-Annular baffle, 12-Filter cartridge, 13-Through hole, 14-Valve, 15-Inner clamping plate, 16-Outer clamping plate, 17-Positioning ring, 18-Lifting rod, 19-Scraper, 20-Hole. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0021] Example 1: A filtration device used in a triple-effect evaporation system, such as Figure 1 As shown, it includes an electromagnetic three-way valve 1, a three-way connector 2, and two filters 3 with different filtration accuracies. Filter 3 is a 3MTM500 series bag filter, but a filter cloth filter centrifuge can also be used. The inlets of the two filters 3 are ( Figure 1 As shown in Figure A, the two outlets of the three-way valve 1 are connected respectively. The inlet of the three-way valve 1 is connected to the water inlet pipe 4, and the water inlet pipe 4 is equipped with a constant pressure water pump 5. The outlets of the two filters 3 ( Figure 1 As shown in Figure B, two ports of the tee connector 2 are connected respectively, and the other port of the tee connector 2 is equipped with a drain pipe 6.

[0022] A one-way valve 7 is provided between the three-way connector 2 and the outlet of the filter 3. The one-way valve 7 prevents the sewage from mixing between the two filters 3.

[0023] Preferably, the drain pipe 6 is equipped with a water flow meter 8 (model YHL500) with an alarm function, which can issue an alarm when the flow rate is less than a certain value. The water flow meter 8 can also indicate whether the filter 3 through which the sewage is currently passing is clogged. Clogging is generally caused by the recovery of a sufficient amount of crystallized salt in the filter 3, reminding workers to remove it in time.

[0024] The filtration device also includes a control mechanism, which includes an FX3U2N controller. The three-way valve 1 and the water flow meter 8 are both connected to the controller.

[0025] Working principle of Example 1: According to the type of sewage, the corresponding filter 3 is selected. For example, the left filter 3 has low filtration accuracy and the right filter 3 has high filtration accuracy. When the crystallized salt particles in the sewage are large, the left filter 3 is selected.

[0026] Pump 5 draws wastewater containing crystalline salt particles. The wastewater enters the left-side filter 3 through inlet pipe 4 and three-way valve 1, where it intercepts the crystalline salt before being discharged through drain pipe 6. When the crystalline salt accumulates to a certain level in the left-side filter 3, the flow rate in drain pipe 6 decreases. The flow meter 8 detects the flow signal and issues an alarm, informing workers that filter 3 needs to be treated to recover the crystalline salt. Simultaneously, the flow meter 8 sends a signal to the controller, which changes the outlet of three-way valve 1, allowing the wastewater to enter the right-side filter 3. The right-side filter 3 is used briefly, and after recovering the crystalline salt from the left-side filter, it is immediately switched back to the left-side filter. During the recovery of crystalline salt, the triple-effect evaporation system can maintain continuous drainage, facilitating continuous production.

[0027] Example 2: Based on Example 1, the three-way valve is a manual valve, eliminating the need for a controller. When the water flow meter issues an alarm, the worker manually switches the three-way valve to allow the wastewater to enter another filter until the crystallized salt is recovered, at which point it is switched back.

[0028] Example 3: Based on Example 1, the filter is redesigned, such as... Figure 2 and Figure 3 As shown, the redesigned filter 3 includes a cylindrical housing 9, with both the upper and lower ends of the housing 9 bulging outwards. The housing has a split structure, consisting of two flange bolts connected together.

[0029] The housing 9 contains a cylindrical body 10, which is welded from a porous stainless steel plate. The lower end of the cylindrical body 10 is fixed to the bottom of the housing 9. The upper end of the cylindrical body 10 is provided with an annular partition 11 fixed to the housing 9. The cylindrical body 10 contains a filter cartridge 12 made of filter cloth, and the upper end of the filter cartridge 12 extends beyond the cylindrical body 10. The cylindrical body 10 is provided with multiple through holes 13 corresponding to the positions of the filter cartridge 12. The bottom of the housing 9 is provided with a valve 14, preferably a gate valve. The valve 14 is located inside the cylindrical body 10. The inlet and outlet of the filter 3 are provided on the side wall of the housing 9 and are located on the upper and lower sides of the annular partition 11, respectively.

[0030] The filter cartridge 12 has an annular inner clamping plate 15 on its inner side. The outer diameter of the inner clamping plate 15 matches the inner diameter of the cylinder 10. The filter cartridge 12 has an annular outer clamping plate 16 on its outer side. The outer clamping plate 16 is screwed to the inner clamping plate 15. The outer clamping plate 16 is located on the upper side of the annular partition 11. The lower end of the inner clamping plate 15 is inserted into the cylinder 10.

[0031] The filter cartridge 12 is provided with an annular positioning ring 17 on the inner side of its lower end, and the positioning ring 17 is in clearance fit with the filter cartridge 12.

[0032] The filter cartridge 12 has a lifting rod 18 on its inner side, and a drive unit connected to the lifting rod 18 is provided on the top of the housing 9. The drive unit can be an electric lifting rod, a cylinder, or a pneumatic cylinder. Under the action of the controller, it drives the lifting rod 18 to move up and down reciprocally. The lifting rod 18 has multiple conical scrapers 19. The scrapers 19 are made of flexible material, and the middle part of the scraper 19 is fixed to the lifting rod 18. The thickness of the scraper 19 gradually decreases from the middle to the edge, and the scraper 19 has multiple holes 20. Preferably, a spring frame can be built into the scraper 19.

[0033] The working principle of filter 3: Figure 2 As shown, wastewater enters the housing 9 from inlet A, is filtered by the filter cartridge 12 (made of filter cloth), and then enters the outer side of the cylinder 10, exiting from outlet B. Crystallized salt is trapped on the inner wall of the filter cartridge 12. The lifting rod 18 moves the scraper 19 up and down. Due to the conical shape of the scraper 19, when it descends, its outer edge is in close contact with the filter cartridge 12, separating the crystallized salt and reducing clogging. When the scraper 19 rises, its outer end is flexible and easily deformable, causing its lower end to contract inward, creating a gap between the scraper 19 and the filter cartridge 12, facilitating the downward passage of crystallized salt. Crystallized salt accumulates at the bottom of the cylinder 10. Once it reaches a certain height, i.e., the distribution area entering the through-hole 13, the flow rate of the filter 3 will decrease. To recover the crystallized salt, simply open valve 14.

[0034] When the filter cartridge 12 is clogged, open the housing 9 to remove the filter cartridge 12 for replacement, or soak it in a solution to dissolve the blockage in its pores before reinstalling it.

[0035] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A filtration device used in a triple-effect evaporation system, characterized in that: It includes a three-way valve (1), a three-way connector (2) and two filters (3) with different filtration precision. The inlets of the two filters (3) are respectively connected to the two outlets of the three-way valve (1). The inlet of the three-way valve (1) is connected to a water inlet pipe (4). A water pump (5) is installed on the water inlet pipe (4). The outlets of the two filters (3) are respectively connected to two ports of the three-way connector (2). The other port of the three-way connector (2) is equipped with a drain pipe (6).

2. The filtration device used in the triple-effect evaporation system according to claim 1, characterized in that: A check valve (7) is provided between the three-way connector (2) and the outlet of the filter (3).

3. The filtration device used in the triple-effect evaporation system according to claim 1, characterized in that: The drain pipe (6) is equipped with a water flow meter (8) with an alarm function.

4. The filtration device used in the triple-effect evaporation system according to claim 2, characterized in that: The filtration device also includes a control mechanism, which includes a controller. The three-way valve (1) and the water flow meter (8) are both connected to the controller.

5. The filtration device used in the triple-effect evaporation system according to claim 1, characterized in that: The filter (3) includes a cylindrical shell (9), a cylinder (10) is provided inside the shell (9), the lower end of the cylinder (10) is fixed to the bottom of the shell (9), the upper end of the cylinder (10) is provided with an annular partition (11) fixed to the shell (9), a filter cylinder (12) of filter cloth material is provided inside the cylinder (10), the upper end of the filter cylinder (12) extends beyond the cylinder (10), the cylinder (10) is provided with multiple through holes (13) corresponding to the position of the filter cylinder (12), a valve (14) is provided at the bottom of the shell (9), the valve (14) is located inside the cylinder (10), and the inlet and outlet of the filter (3) are provided on the side wall of the shell (9) and are respectively located on the upper and lower sides of the annular partition (11).

6. The filtration device used in the triple-effect evaporation system according to claim 5, characterized in that: The filter cylinder (12) has an annular inner clamping plate (15) on its inner side and an annular outer clamping plate (16) on its outer side. The outer clamping plate (16) is screwed to the inner clamping plate (15). The outer clamping plate (16) is located on the upper side of the annular partition (11), and the lower end of the inner clamping plate (15) is inserted into the cylinder (10).

7. The filtration device used in the triple-effect evaporation system according to claim 5, characterized in that: The filter cartridge (12) has an annular positioning ring (17) on the inner side of its lower end.

8. The filtration device used in the triple-effect evaporation system according to claim 7, characterized in that: The filter cartridge (12) has a lifting rod (18) on its inner side. The top of the housing (9) has a drive unit that connects to the lifting rod (18). The lifting rod (18) has multiple conical scrapers (19). The scrapers (19) are made of flexible material. The middle part of the scraper (19) is fixed to the lifting rod (18). The thickness of the scraper (19) gradually decreases from the middle to the edge. The scraper (19) has multiple holes (20).

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