Double-diaphragm filter press

Abstract

The utility model discloses a double-diaphragm filter press which comprises a feeding machine base and a movable pressing machine base, a plurality of filter plate assemblies are arranged between the feeding machine base and the movable pressing machine base, the feeding machine base, the filter plate assemblies and the movable pressing machine base are provided with a medium inlet channel and a medium outlet channel, and the double-diaphragm filter press further comprises a medium circulation heating device. An outlet end of the medium circulation heating device is connected with a medium inlet channel on the feeding machine base, a medium discharge channel on the feeding machine base is connected with an inlet end of the medium circulation heating device, a filtrate discharge channel of the feeding machine base is connected with a filter pressing filtrate discharge pipe and a pressed filtrate discharge pipe, and the pressed filtrate discharge pipe is connected with a negative pressure generator. The filter chamber is in a negative pressure state through the negative pressure generator, and the squeezing medium is in a high temperature state through the medium circulation heating device, so that a more uniform filter cake dehydration effect with lower water content can be obtained under the condition of the same squeezing pressure, and a more scientific solution is provided for dehydration of the filter press.

Description

Technical Field

[0001] This utility model relates to the field of filter press technology, and in particular to a double diaphragm filter press. Background Technology

[0002] In the dewatering process of a diaphragm filter press, to obtain a filter cake with a more ideal solids content, current technologies generally involve maximizing the diaphragm compression pressure of the equipment itself to further reduce the filter cake moisture content. This theoretically amplifies the pressure applied to the diaphragm of the filter press. While increasing the diaphragm compression pressure directly solves the problem of insufficient diaphragm compression pressure leading to an unsatisfactory filter cake solids content, it also introduces several negative impacts. For example, excessive back pressure in the hydraulic cylinder leads to a double problem of safety and cost; prolonged high-load conditions on the filter plates (diaphragm plates) can also lead to premature fatigue damage; and for most materials, further increasing the compression pressure after a certain point does not significantly reduce the moisture content of the filter cake. Therefore, a more effective dewatering solution is needed to improve the filter cake dewatering effect, reduce the moisture content, and lower production costs. Utility Model Content

[0003] The purpose of this invention is to provide a double diaphragm filter press that utilizes the physical property that the boiling point of a liquid decreases under negative pressure. The remaining liquid in the filter cake evaporates more easily in a boiling environment. To achieve the same filter cake solids content, the required pressing pressure is lower, and the filter cake solids content is also lower and more uniform, providing a more scientific solution for filter press dewatering.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A double-diaphragm filter press includes a feeding base and a movable pressing base. Multiple filter plate assemblies are disposed between the feeding base and the movable pressing base. The feeding base, filter plate assemblies, and movable pressing base are provided with material feeding channels and filtrate discharge channels. The feeding base, filter plate assemblies, and movable pressing base are also provided with media inlet channels and media outlet channels for the flow of heat-conducting pressing media. The press also includes a media circulation heating device. The outlet end of the media circulation heating device is connected to the media inlet channel on the feeding base, and the media outlet channel on the feeding base is connected to the inlet end of the media circulation heating device. The filtrate discharge channel of the feeding base is connected to a filter press filtrate discharge pipe and a pressing filtrate discharge pipe. Both the filter press filtrate discharge pipe and the pressing filtrate discharge pipe are equipped with valves. The pressing filtrate discharge pipe is connected to a negative pressure generator.

[0006] Furthermore, the filter plate assembly includes a diaphragm plate, and a heat-conducting pressing diaphragm sheet and a filter cloth are sequentially arranged on the outward end face of the diaphragm plate. The heat-conducting pressing diaphragm sheet and the diaphragm plate form a heat-conducting pressing chamber, and the medium inlet channel and the medium outlet channel are both connected to the heat-conducting pressing chamber.

[0007] Furthermore, the medium circulation heating device includes a heating device and a medium insulation storage tank. The medium insulation storage tank is connected to the medium inlet channel on the feeder base via a high-pressure conveying pump. The medium outlet channel on the feeder base is connected to the inlet end of the medium insulation storage tank via a return pipe, and a pressure regulating valve is provided on the return pipe.

[0008] Furthermore, the outlet end of the medium insulation storage tank is connected to the inlet end of the heating device, the outlet end of the heating device is connected to the inlet end of the medium insulation storage tank, and the heating device or the medium insulation storage tank is connected to a liquid replenishment port.

[0009] Furthermore, the filter press filtrate discharge pipe is connected to a filtrate collection tank.

[0010] Furthermore, the filtrate outlet of the negative pressure generator is connected to the filtrate collection tank, and the negative pressure generator is equipped with a vacuum pressure gauge and a temperature gauge.

[0011] Furthermore, the heat-conducting pressing diaphragm is equipped with filter pins adapted to the filter cloth.

[0012] Furthermore, the movable clamping base is equipped with a feed channel interconnection pipe, which connects the two material feed channels on the movable clamping base.

[0013] Furthermore, the diaphragm plate is provided with a feed branch channel that connects the filter chamber and the material feed channel.

[0014] This utility model has the following advantages:

[0015] 1. Utilizing the physical property that the boiling point of a liquid decreases under negative pressure, the remaining liquid in the filter cake evaporates more easily in a boiling environment. By using a negative pressure generator to create a negative pressure state in the filter chamber, and a medium circulation heating device to keep the pressing medium at a high temperature, a filter cake with lower and more uniform moisture content can be obtained under the same pressing pressure, providing a more scientific solution for filter press dewatering.

[0016] 2. The medium circulation heating device keeps the water temperature and pressure within a controlled range, ensuring that the filter cake is continuously evaporated and dehydrated, thus improving dehydration efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the state during the pressing and dehydration process of this utility model.

[0019] In the diagram, 1-feeding machine base, 2-movable pressing machine base, 3-material feeding channel, 4-filtrate discharge channel, 5-media inlet channel, 6-media discharge channel, 7-filter filtrate discharge pipe, 8-press filtrate discharge pipe, 9-valve, 10-negative pressure generator, 11-diaphragm plate, 12-thermal conductive pressing diaphragm sheet, 13-filter cloth, 14-thermal conductive pressing chamber, 15-heating device, 16-media heat-insulating storage tank, 17-high pressure conveying pump, 18-return pipe, 19-pressure regulating valve, 20-filtrate collection tank, 21-feeding branch channel, 22-filter nail, 23-feeding channel interconnection pipe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used 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. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] refer to Figure 1 As shown in Figure 2, one embodiment of this utility model is as follows:

[0027] A double diaphragm filter press includes a feeding base 1 and a movable pressing base 2. Multiple filter plate assemblies are arranged between the feeding base 1 and the movable pressing base 2. The feeding base 1, the filter plate assemblies, and the movable pressing base 2 are provided with a material feeding channel 3 and a filtrate discharge channel 4. The feeding base 1, the filter plate assemblies, and the movable pressing base 2 are provided with a medium inlet channel 5 and a medium outlet channel 6 for heat-conducting pressing medium flow. It also includes a medium circulation heating device. The outlet end of the medium circulation heating device is connected to the medium inlet channel 5 on the feeding base 1. The medium outlet channel 6 on the feeding base 1 is connected to the inlet end of the medium circulation heating device. The filtrate discharge channel 4 of the feeding base 1 is connected to a filter press filtrate discharge pipe 7 and a press filtrate discharge pipe 8. Both the filter press filtrate discharge pipe 7 and the press filtrate discharge pipe 8 are provided with valves 9. The press filtrate discharge pipe 8 is connected to a negative pressure generator 10.

[0028] The filter plate assembly includes a diaphragm plate 11. The end face of the diaphragm plate 11 is provided with a heat-conducting pressing diaphragm sheet 12 and a filter cloth 13 in sequence. The heat-conducting pressing diaphragm sheet 12 and the diaphragm plate 11 form a heat-conducting pressing chamber 14. The medium inlet channel 5 and the medium outlet channel 6 are both connected to the heat-conducting pressing chamber 14.

[0029] The medium circulation heating device includes a heating device 15 and a medium insulation storage tank 16. The medium insulation storage tank 16 is connected to the medium inlet channel 5 on the feeder base 1 through a high-pressure conveying pump 17. The medium outlet channel 6 on the feeder base 1 is connected to the inlet end of the medium insulation storage tank 16 through a return pipe 18. A pressure regulating valve 19 is provided on the return pipe 18.

[0030] The outlet end of the medium insulation storage tank 16 is connected to the inlet end of the heating device 15, and the outlet end of the heating device 15 is connected to the inlet end of the medium insulation storage tank 16. The heating device 15 or the medium insulation storage tank 16 is connected to a liquid replenishment port.

[0031] The filter press filtrate discharge pipe is connected to a filtrate collection tank 20.

[0032] The filtrate outlet of the negative pressure generator 10 is connected to the filtrate collection tank 20, and the negative pressure generator 10 is equipped with a vacuum pressure gauge and a temperature gauge.

[0033] like Figure 1 As shown, the medium insulation storage tank 16 has multiple inlet and outlet ends to facilitate connection with equipment within the system. It is understood that in this embodiment, the connection between devices is achieved through pipelines, such as the medium insulation storage tank 16 and the heating device 15, and the medium insulation storage tank 16 and the medium inlet channel 5 and medium outlet channel 6 on the feeder base 1. The heating device 15, the medium insulation storage tank 16, the negative pressure generator 10, and the high-pressure transfer pump 17 are all existing technologies, and their internal structural features are also existing technologies. Those skilled in the art can purchase commercially available equipment according to actual needs. In this embodiment, the heat conduction and pressure transfer medium is a liquid medium, such as purified water. To achieve the required pressure, flow rate, and temperature for the process, and to keep the process within a controlled temperature and pressure range, the system equipment is equipped with various types of sensors required for pressure and temperature detection, such as thermometers, vacuum gauges, and flow meters. The installation location, quantity, and product selection can be determined by those skilled in the art based on actual conditions.

[0034] like Figure 2 As shown, during pressing, both sides of the filter cake are in contact with the diaphragm, which allows the filter cake to be heated more evenly and the heating effect to be better.

[0035] After the filter chamber is closed, the material enters through the material feed channel and then enters the filter chamber through the feed branch channel 21 on the diaphragm. During the feeding process, the valve 9 on the filter press filtrate discharge pipe 7 is opened, and the valve 9 on the press filtrate discharge pipe 8 is closed. The filter press filtrate flows out from the filter press filtrate discharge pipe 7 by gravity to the connected filtrate collection tank 20.

[0036] During diaphragm pressing, the high-pressure delivery pump 17 pumps the high-temperature liquid medium into the heat-conducting pressing chamber 14, causing the heat-conducting pressing diaphragm 12 to bulge and squeeze the filter cake in the filter chamber for pressing and dehydration. The high-temperature liquid medium heats the filter cake, and the water pressure can be adjusted by the pressure regulating valve 19. During this process, the valve 9 on the filtrate discharge pipe 7 is closed, and the valve 9 on the filtrate discharge pipe 8 is opened, so that the negative pressure generator 10 is connected to the filtrate pipeline to extract the residual filtrate from the filter cake in the filter chamber. The negative pressure generator 10 makes the filter chamber a relative vacuum negative pressure environment. During this process, the boiling point of the water remaining in the filter chamber will decrease accordingly. While being dehydrated by the squeezing pressure, it can continue to evaporate rapidly, thereby accelerating the overall dehydration efficiency and making the filter cake reach a lower moisture content more quickly.

[0037] This application utilizes the physical property that water's boiling point decreases under negative pressure, making it easier for the residual liquid in the filter cake to evaporate in a boiling environment. A negative pressure generator creates a negative pressure state in the filter chamber, and a high-temperature liquid medium is used as the pressing medium, causing the residual liquid in the filter cake to undergo a continuous boiling and evaporation reaction. Combined with the continuous compression and dehydration of the filter cake by the diaphragm, the filter cake exhibits a more thorough, efficient, and uniform separation effect under these dual conditions. Therefore, under the same pressing pressure, a lower moisture content and more uniform filter cake dewatering effect can be obtained, providing a more scientific solution for filter press dewatering.

[0038] Since boiling evaporation consumes some heat, the heat consumed by boiling evaporation is balanced by a medium circulation heating device within the system, allowing the remaining liquid in the filter cake to undergo a continuous boiling evaporation reaction. This allows the filter cake moisture content to be stably controlled at a low level without introducing very high diaphragm pressing pressure.

[0039] During the pressing process, some of the residual water in the filter cake is squeezed out after being subjected to the squeezing pressure from the diaphragm. In the vacuum low-boiling-point environment, the residual water also evaporates rapidly. While the water evaporates, some heat is also carried away. Therefore, this embodiment sets up a heating device 15, a medium heat preservation storage tank 16, a high-pressure delivery pump 17 and a pressure regulating valve 19 to keep the water temperature and pressure within a controlled range, so that the filter cake continues to evaporate and dehydrate, thereby improving the dehydration efficiency.

[0040] Furthermore, the heat-conducting pressing diaphragm 12 is provided with filter pins 22 adapted to the filter cloth 13.

[0041] The movable clamping base 2 is equipped with a feed channel interconnection pipe 23, which connects to the two material feed channels 3 on the movable clamping base 2. It can be understood that the feed channel interconnection pipe 23 is used to accommodate the situation where only one side of the material feed channel 3 is connected to the feed pipe fitting. When both sides of the material feed channels 3 are directly connected to the feed pipe fitting, the feed channel interconnection pipe 23 is not required.

[0042] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double diaphragm filter press, comprising a feeding base and a movable pressing base, wherein a plurality of filter plate assemblies are disposed between the feeding base and the movable pressing base, and the feeding base, filter plate assemblies, and movable pressing base are provided with material feeding channels and filtrate discharge channels, characterized in that: The feeding machine base, filter plate assembly, and movable pressing machine base are provided with a medium inlet channel and a medium outlet channel for the flow of heat-conducting pressing medium. It also includes a medium circulation heating device. The outlet end of the medium circulation heating device is connected to the medium inlet channel on the feeding machine base, and the medium outlet channel on the feeding machine base is connected to the inlet end of the medium circulation heating device. The filtrate outlet channel of the feeding machine base is connected to a filter press filtrate outlet pipe and a pressing filtrate outlet pipe. Both the filter press filtrate outlet pipe and the pressing filtrate outlet pipe are equipped with valves. The pressing filtrate outlet pipe is connected to a negative pressure generator.

2. The double diaphragm filter press according to claim 1, characterized in that: The filter plate assembly includes a diaphragm plate, and a heat-conducting pressing diaphragm sheet and a filter cloth are sequentially arranged on the end face of the diaphragm plate. The heat-conducting pressing diaphragm sheet and the diaphragm plate form a heat-conducting pressing chamber. The medium inlet channel and the medium outlet channel are both connected to the heat-conducting pressing chamber.

3. A double diaphragm filter press according to claim 1, characterized in that: The medium circulation heating device includes a heating device and a medium insulation storage tank. The medium insulation storage tank is connected to the medium inlet channel on the feeder base via a high-pressure conveying pump. The medium outlet channel on the feeder base is connected to the inlet end of the medium insulation storage tank via a return pipe. A pressure regulating valve is provided on the return pipe.

4. A double diaphragm filter press according to claim 3, characterized in that: The outlet end of the medium insulation storage tank is connected to the inlet end of the heating device, the outlet end of the heating device is connected to the inlet end of the medium insulation storage tank, and the heating device or the medium insulation storage tank is connected to a liquid replenishment port.

5. A double diaphragm filter press according to claim 1, characterized in that: The filter press filtrate discharge pipe is connected to a filtrate collection tank.

6. A double diaphragm filter press according to claim 5, characterized in that: The filtrate outlet of the negative pressure generator is connected to the filtrate collection tank, and the negative pressure generator is equipped with a vacuum pressure gauge and a temperature gauge.

7. A double diaphragm filter press according to claim 2, characterized in that: The thermally conductive pressing diaphragm is provided with filter pins adapted to the filter cloth.

8. A double diaphragm filter press according to claim 1, characterized in that: The movable pressing base is provided with a feed channel interconnection pipe, which connects the two material feed channels on the movable pressing base.

9. A double diaphragm filter press according to claim 2, characterized in that: The diaphragm plate is provided with a feed branch channel that connects the filter chamber and the material feed channel.

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