A pressure filtration device and a pressure filtration method

Abstract

The present application provides a pressure filtration device and a pressure filtration method. The pressure filtration device includes a heating and pressing assembly and a first heat exchanger. The heating and pressing assembly forms a material chamber and a pressing chamber. The heating and pressing assembly includes an elastically deformable diaphragm. The material chamber and the pressing chamber are separated by the diaphragm. The material chamber is used to accommodate sludge. The first heat exchanger is communicated with the pressing chamber, and a first circuit is formed between the first heat exchanger and the pressing chamber. The first circuit is used to accommodate a first medium. The first medium can circulate in the first circuit. The first heat exchanger can heat the first medium to heat the sludge located in the material chamber through the diaphragm. The first medium is used to expand the pressing chamber to squeeze the sludge located in the material chamber through the diaphragm. The first medium can also heat the diaphragm while pressing on the diaphragm, and then press and heat the filter cake through the diaphragm. The pressure filtration device can realize the parallel operation of pressing and heating, improving the treatment efficiency on the one hand and simplifying the structure of the pressure filtration device on the other hand.

Description

Technical Field

[0001] The present application relates to the field of pressure filtration, in particular to a pressure filtration device and a pressure filtration method. Background Art

[0002] In related technologies, the sludge dewatering and drying system generally proceeds in multiple stages with multiple devices, that is, first dewatering is carried out by pressure filtration, centrifugation or vacuum equipment, and then drying is carried out by plate type, fluidized bed, rotary drum, belt type and other equipment. It has disadvantages such as long process, complex operation, low efficiency, high energy consumption, and poor environmental health conditions.

[0003] Currently, some pressure filtration devices for integrated dewatering and drying have also emerged. In these devices, first, the sludge is squeezed and filtered by a pressure filter plate, and after the pressure filtration is completed, the filter cake is heated by a heating plate for drying. That is to say, the pressing and heating are controlled through two sets of independent pipelines and systems, resulting in poor integrity of the pressure filtration device, high device complexity, long pressure filtration time, and the sludge treatment efficiency needs to be improved. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. For this reason, the present application provides a pressure filtration device and a pressure filtration method. The pressure filtration device can realize the parallel operation of pressing and heating, which can improve the processing efficiency on the one hand and simplify the structure of the pressure filtration device on the other hand.

[0005] According to the pressure filtration device provided by the present application, it includes a heating and pressing assembly and a first heat exchanger. The heating and pressing assembly forms a material chamber and a pressing chamber. The heating and pressing assembly includes an elastically deformable diaphragm. The material chamber and the pressing chamber are separated by the diaphragm. The material chamber is used to accommodate sludge. The first heat exchanger is communicated with the pressing chamber, and a first circuit is formed between the first heat exchanger and the pressing chamber. The first circuit is used to accommodate a first medium. The first medium can circulate in the first circuit. The first heat exchanger can heat the first medium to heat the sludge in the material chamber through the diaphragm. The first medium is used to expand the pressing chamber to squeeze the sludge in the material chamber through the diaphragm.

[0006] The pressure filtration device provided by the present application has at least the following technical effects: By setting a first circuit with a first heat exchanger, the first heat exchanger heats the first medium, so that the first medium in the pressing chamber can heat the diaphragm while pressing on the diaphragm, and then press and heat the filter cake in the material chamber through the diaphragm. The pressure filtration device can realize the parallel operation of pressing and heating, which can improve the processing efficiency on the one hand and simplify the structure of the pressure filtration device on the other hand.

[0007] According to some embodiments of the present application, the pressure filtration device includes a pressure reducing valve and a compressor. The pressure reducing valve and the compressor are arranged in the first circuit. The pressure reducing valve is located upstream of the first heat exchanger, and the compressor is located downstream of the first heat exchanger. The first medium is a refrigerant.

[0008] According to some embodiments of the present application, the pressure filtration device includes a second heat exchanger. A second circuit is formed between the second heat exchanger and the first heat exchanger. The second circuit is used to accommodate a second medium. The second medium can circulate in the second circuit. The second medium is used to heat the first medium, and the first medium is water.

[0009] According to some embodiments of the present application, the pressure filtration device includes a pressure reducing valve and a compressor. The pressure reducing valve and the compressor are arranged in the second circuit. The pressure reducing valve is located upstream of the second heat exchanger, and the compressor is located downstream of the second heat exchanger. The second medium is a refrigerant.

[0010] According to some embodiments of the present application, the pressure filtration device includes a pressure filtration pump. The pressure filtration pump is arranged in the first circuit. The pressure filtration pump is located downstream of the first heat exchanger. The pressure filtration pump is used to pump the first medium into the pressing chamber.

[0011] According to some embodiments of the present application, the heating and pressing assembly includes one of the following ways: the heating and pressing assembly includes a diaphragm pressure filter plate and a porous pressure filter plate. The porous pressure filter plate and the diaphragm pressure filter plate are arranged alternately. The diaphragm pressure filter plate forms the pressing chamber. A material chamber is formed between the porous pressure filter plate and the diaphragm pressure filter plate. The diaphragm pressure filter plate includes the diaphragm. The porous pressure filter plate includes a porous plate for filtering filtrate; the heating and pressing assembly includes a diaphragm pressure filter plate and a plate frame covered with filter cloth. The plate frame and the diaphragm pressure filter plate are arranged alternately. The diaphragm pressure filter plate forms the pressing chamber. A material chamber is formed between the filter cloth and the diaphragm pressure filter plate. The diaphragm pressure filter plate includes the diaphragm.

[0012] According to the pressure filtration method provided by the present application, using the pressure filtration device provided by the present application, the pressure filtration method includes the following steps:

[0013] Feed sludge into the material chamber;

[0014] Feed the first medium heated by the first heat exchanger into the pressing chamber. The first medium heats the pressing chamber and causes the pressing chamber to expand, so as to heat and press the sludge, and at the same time discharge the filtrate;

[0015] After heat exchange in the pressing chamber, the first medium returns to the first heat exchanger through the first circuit to be heated again.

[0016] According to the pressure filtration method provided by the present application, the pressure filtration equipment provided by the present application is used, so it correspondingly has the beneficial effects provided by the aforementioned pressure filtration equipment, which will not be elaborated herein.

[0017] According to some embodiments of the present application, during or after heating and pressing, the material chamber is evacuated to extract the water vapor in the material chamber, and the water vapor is discharged after being condensed by cooling water.

[0018] According to some embodiments of the present application, the cooling water after condensation heat exchange is used to directly or indirectly heat the first medium.

[0019] According to some embodiments of the present application, the first medium undergoes a Carnot cycle in the first circuit, and the third medium heats the first medium through the first heat exchanger. The third medium is a gaseous or liquid substance, and the first medium heats and pressurizes the pressing chamber; alternatively, the second medium undergoes a Carnot cycle in the second circuit, and the third medium heats the second medium through the second heat exchanger. The third medium is a gaseous or liquid substance, the second medium heats the first medium, and the high-pressure water pump located in the first circuit pressurizes the first medium, thereby heating and pressurizing the pressing chamber. Description of the Drawings

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0021] Figure 1 is a partial connection schematic diagram of the pressure filtration equipment according to the embodiment of the present application;

[0022] Figure 2 is a partial connection schematic diagram of the pressure filtration equipment according to the embodiment of the present application;

[0023] Figure 3 is a structural schematic diagram of the diaphragm pressure filtration plate according to the embodiment of the present application;

[0024] Figure 4 is a structural schematic diagram of the porous pressure filtration plate according to the embodiment of the present application;

[0025] Figure 5 is an assembly schematic diagram of the diaphragm pressure filtration plate and the porous pressure filtration plate according to the embodiment of the present application;

[0026] Figure 6 is Figure 1 a connection schematic diagram of the corresponding pressure filtration equipment embodiment;

[0027] Figure 7 is Figure 2 a connection schematic diagram of the corresponding pressure filtration equipment embodiment.

[0028] Reference Signs:

[0029] Heating and pressing assembly 100, material chamber 110, pressing chamber 120, diaphragm filter plate 130, diaphragm 131, first plate frame 132, porous filter plate 140, porous plate 141, second plate frame 142, liquid discharge chamber 150, pressing oil cylinder 160,

[0030] First heat exchanger 210, pressure reducing valve 220, compressor 230, second heat exchanger 240, filter press pump 250,

[0031] First circuit 310, second circuit 320, filtrate discharge passage 330, vacuum drying passage 340, feed passage 350, chemical addition passage 360, backwashing passage 370,

[0032] Condenser 410, vacuum pump 420, thickener 430, conditioning tank 440, mixer 450, chemical tank 460, dry sludge conveyor 470. Detailed implementation manners

[0033] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0034] In the description of the present application, it should be understood that for the orientation description, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0035] In the description of the present application, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0036] In the description of this application, unless otherwise clearly defined, terms such as "setting", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in this application in combination with the specific content of the technical solution.

[0037] To improve the treatment efficiency of sludge, in related technologies, a filter press device with an integrated dehydration and drying function is often used.

[0038] The filter press device has a material chamber and a pressing chamber. Currently, the general filter press device has mutually independent pressing and dewatering circuits and heating and drying circuits, and the pressing and dewatering circuit and the heating and drying circuit are respectively connected to the pressing chamber. During operation, first, the sludge is fed into the material chamber, and the material chamber preliminarily filters the sludge to form a filter cake. Then, a high-pressure medium is fed into the pressing chamber through the pressing and dewatering circuit, and the pressing chamber squeezes the filter cake in the material chamber to further reduce the water content of the filter cake. Finally, a high-temperature medium (such as hot water generated by an atmospheric pressure hot water boiler) is fed into the pressing chamber through the heating and drying circuit, and the high-temperature medium heats the filter cake to further reduce the water content of the filter cake.

[0039] Since two sets of circuits need to be set up, the pipeline of the filter press device is complex. At the same time, since dehydration and drying are carried out separately, the time required for sludge filtration is prolonged, resulting in the efficiency of the filter press device needing to be improved.

[0040] Refer to Figure 1 and Figure 2 , the filter press device provided by this application includes a heating and pressing assembly 100 and a first heat exchanger 210. The heating and pressing assembly 100 forms a material chamber 110 and a pressing chamber 120. The heating and pressing assembly 100 includes an elastically deformable diaphragm 131. The material chamber 110 and the pressing chamber 120 are separated by the diaphragm 131. The material chamber 110 is used to accommodate sludge. The first heat exchanger 210 is connected to the pressing chamber 120. A first circuit 310 is formed between the first heat exchanger 210 and the pressing chamber 120. The first circuit 310 is used to accommodate a first medium. The first medium can circulate in the first circuit 310. The first heat exchanger 210 can heat the first medium to heat the sludge in the material chamber 110 through the diaphragm. The first medium is used to expand the pressing chamber 120 to squeeze the sludge in the material chamber 110 through the diaphragm 131.

[0041] According to the filter press device provided by this application, by setting up the first circuit 310 with the first heat exchanger 210, the first heat exchanger 210 heats the first medium, making the first medium a high-temperature and high-pressure medium. Thus, the first medium in the pressing chamber 120 can heat the diaphragm 131 while pressing on the diaphragm, and press and heat the filter cake in the material chamber 110 through the diaphragm 131. The filter press device can realize the parallel operation of pressing and heating, improving the treatment efficiency on the one hand and simplifying the structure of the filter press device on the other hand.

[0042] Correspondingly, according to the pressure filtration method provided by the present application, the pressure filtration equipment of the present application is used, and the method includes the following steps:

[0043] Feed sludge into the material chamber 110;

[0044] Feed the first medium heated by the first heat exchanger 210 into the pressing chamber 120. The first medium heats the pressing chamber 120 and causes the pressing chamber 120 to expand, so as to heat and press the sludge, and at the same time discharge the filtrate;

[0045] After heat exchange in the pressing chamber 120, the first medium returns to the first heat exchanger 210 through the first circuit 310 to be heated again.

[0046] The pressure filtration method performs the pressing and heating of the filter cake in parallel, which can effectively improve the sludge treatment efficiency.

[0047] In some embodiments, the first medium directly heats the pressing chamber 120 based on the Carnot cycle. That is to say, in the corresponding pressure filtration method, the first medium undergoes a Carnot cycle in the first circuit 310, thereby heating and pressurizing the pressing chamber 120. At this time, there is also a third medium correspondingly. The third medium heats the first medium through the first heat exchanger 210, and the third medium can be a gaseous or liquid substance.

[0048] Specifically, referring to Figure 1 , the pressure filtration equipment includes a pressure reducing valve 220 and a compressor 230. The pressure reducing valve 220 and the compressor 230 are arranged in the first circuit 310. The pressure reducing valve 220 is located upstream of the first heat exchanger 210, and the compressor 230 is located downstream of the first heat exchanger 210. In other words, at this time, the first medium is a refrigerant. The first medium is compressed into a high-temperature and high-pressure gas in the compressor 230, and then enters the pressing chamber 120 to release heat and apply pressure to the pressing chamber 120. The first medium changes from a gaseous state to a liquid state. After that, the liquid first medium expands by reducing pressure through the pressure reducing valve 220, then enters the first heat exchanger 210 to vaporize, and finally the gaseous first medium is compressed into a high-temperature and high-pressure gas by the compressor 230 again.

[0049] In some other embodiments, the pressing chamber 120 can also be heated indirectly according to the Carnot cycle.

[0050] For example, referring to Figure 2, in some embodiments, the filter press device includes a second heat exchanger 240. A second circuit 320 is formed between the second heat exchanger 240 and the first heat exchanger 210. The second circuit 320 is used to accommodate a second medium, and the second medium can circulate in the second circuit 320. The second medium is used to heat the first medium. At this time, different from the direct heating scheme, the pressure reducing valve 220 and the compressor 230 are arranged in the second circuit 320. The pressure reducing valve 220 is located upstream of the second heat exchanger 240, and the compressor 230 is located downstream of the second heat exchanger 240. In other words, the second medium is a refrigerant, and the second medium heats the first medium through a Carnot cycle, and then the first medium heats and pressurizes the pressing chamber 120 (that is, the second medium indirectly heats the pressing chamber 120 according to the Carnot cycle).

[0051] At this time, the first medium can be water or other liquid media, so other devices are needed to provide high-pressure power for the first medium. For example, continue to refer to Figure 2 , in some embodiments, the filter press device includes a filter press pump 250. The filter press pump 250 is arranged in the first circuit 310. The filter press pump 250 is located downstream of the first heat exchanger 210. The filter press pump 250 is used to pump the first medium to the pressing chamber 120. It can be understood that the filter press pump 250 can be a high-pressure water pump.

[0052] That is to say, in the corresponding filter press method, the second medium undergoes a Carnot cycle in the second circuit 320 to heat the first medium, and the high-pressure water pump located in the first circuit 310 pressurizes the first medium, thereby heating and pressurizing the pressing chamber 120. At this time, there is also a third medium accordingly. The third medium heats the second medium through the second heat exchanger 240, and the third medium can be a gaseous or liquid substance.

[0053] According to the specific type of heat pump used in the Carnot cycle, the heating method for the pressing chamber 120 can be further divided into six methods:

[0054] The first is that the first heat exchanger 210 is an air source heat pump, and the air source heat pump directly heats and pressurizes the pressing chamber 120;

[0055] The second is that the first heat exchanger 210 is a water source heat pump, and the water source heat pump directly heats and pressurizes the pressing chamber 120;

[0056] The third is that the first heat exchanger 210 includes both an air source heat pump and a water source heat pump, and the air source heat pump and the water source heat pump directly heat and pressurize the pressing chamber 120;

[0057] The fourth is that the second heat exchanger 240 is an air source heat pump, and the air source heat pump indirectly heats and pressurizes the pressing chamber 120;

[0058] The fifth type is that the second heat exchanger 240 is a water source heat pump, and the water source heat pump indirectly heats and pressurizes the pressing chamber 120.

[0059] The sixth type is that the second heat exchanger 240 includes both an air source heat pump and a water source heat pump, and the air source heat pump and the water source heat pump indirectly heat and pressurize the pressing chamber 120.

[0060] Compared with indirect heating, the advantage of directly heating the pressing chamber 120 using the Carnot cycle is that the filter press equipment can directly utilize the high pressure generated by the compressor 230 to compress the refrigerant to provide pressure for the pressing chamber 120, without the need to additionally set up other pressurizing devices (such as the filter press pump 250), nor the need to set up another second circuit 320, making the structure of the filter press equipment more simplified.

[0061] The heating and pressing assembly 100 can form the material chamber 110 and the pressing chamber 120 in different ways.

[0062] For example, in some embodiments, the heating and pressing assembly 100 includes diaphragm filter plates and plate frames covered with filter cloth. The plate frames and the diaphragm filter plates are arranged alternately. The diaphragm filter plates form the pressing chamber 120, and the material chamber 110 is formed between the filter cloth and the diaphragm filter plates. The diaphragm filter plates include diaphragms 131. In this way, the layout design of the diaphragm filter plates and the filter cloth can refer to existing integrated dehydration and drying equipment, which will not be elaborated here.

[0063] However, in the related art, the service life of the filter cloth is not good, resulting in the need for frequent maintenance and replacement of the filter cloth for the filter press equipment, affecting the efficiency of sludge treatment. Therefore, in some other embodiments, the heating and pressing assembly 100 includes diaphragm filter plates 130 and porous filter plates 140. The porous filter plates 140 and the diaphragm filter plates 130 are arranged alternately. The diaphragm filter plates 130 form the pressing chamber 120, and the material chamber 110 is formed between the porous filter plates 140 and the diaphragm filter plates 130. The diaphragm filter plates 130 include diaphragms 131, and the porous filter plates 140 include porous plates 141 for filtering filtrate.

[0064] When the filter press equipment is operating, sludge is injected between the porous filter plates 140 and the diaphragm filter plates 130. The porous plates 141 initially filter the sludge, causing the sludge to form a filter cake. Then, the filter cake is heated and pressurized to fully remove the moisture in the filter cake. After the pressing is completed, the porous filter plates 140 and the diaphragm filter plates 130 are separated, and the filter cake can be naturally taken out from the material chamber 110.

[0065] Refer to Figure 3 、 Figure 4 and Figure 5, the diaphragm filter plate 130 includes a first frame 132, and two diaphragms 131 are installed on both sides of the first frame 132 at intervals. The porous filter plate 140 includes a second frame 142, and two porous plates 141 are installed on both sides of the second frame 142 at intervals. The porous filter plate 140 also forms a liquid discharge cavity 150. The liquid discharge cavity 150 communicates with the material cavity 110 through the pores of the porous plate 141. The filtrate filtered out from the material cavity 110 first enters the liquid discharge cavity 150 and then is discharged through the drain outlet of the porous filter plate 140. Refer to Figure 1 , the filtrates of multiple porous filter plates 140 are first gathered together and then uniformly discharged through the filtrate discharge passage 330.

[0066] The diaphragm 131 can be made of expandable plate materials such as highly elastic stainless steel plates, titanium plates or copper plates, so as to have good thermal conductivity while ensuring the deformation ability. The porous plate 141 can be made of permeable plate materials such as porous sintered stainless steel plates and titanium plates. Based on the needs of sludge treatment, the filtration pore diameter of the porous plate 141 can be set between 5 and 50 microns, that is, between 300 and 3000 meshes. The temperature resistance of the porous plate 141 and the diaphragm 131 reaches at least 100 °C, and the pressure resistance reaches at least 1.8 Mpa.

[0067] A gasket can be provided between the porous filter plate 140 and the diaphragm filter plate 130 to avoid leakage under high pressure. The heating and pressing assembly 100 also includes a pressing oil cylinder 160. The pressing oil cylinder 160 is used to drive the first frame 132 and the second frame 142 to press the porous filter plate 140 and the diaphragm filter plate 130 tightly to form a filter cake, and at the same time cooperate with the porous filter plate 140 to initially reduce the water content of the filter cake. After the sludge treatment is completed, the pressing oil cylinder 160 pulls the porous filter plate 140 and the diaphragm filter plate 130 apart one by one, the filter cake falls off, and then the dry sludge conveyor 470 sends the filter cake to the dry sludge storage point and then loads it onto a vehicle for external transportation. The rated working pressure of the pressing oil cylinder 160 can be set to 20 Mpa, and the maximum protection pressure can be set to 25 Mpa. The structural design of the pressing oil cylinder 160 can refer to the existing technologies in related technologies and will not be elaborated here.

[0068] Refer to Figure 6 and Figure 7 , in some embodiments, the filter press device further includes a vacuum drying passage 340, and the vacuum drying passage 340 is used to vacuum-dry the filter cake to further reduce the water content of the filter cake.

[0069] Specifically, the vacuum drying passage 340 is provided with a condenser 410, a vacuum pump 420, etc. The vacuum drying passage 340 communicates with the liquid discharge chamber 150. The vacuum pump 420 provides a vacuum environment for the liquid discharge chamber 150 and the material chamber 110, prompting the liquid in the filter cake to vaporize under the environment of high temperature and low pressure. The vacuum pump 420 simultaneously extracts the water vapor in the liquid discharge chamber 150 and the material chamber 110, and the extracted water vapor is discharged after being condensed by the condenser 410.

[0070] Vacuum drying can be carried out simultaneously with or after heating and pressing. In other words, in some embodiments of the pressure filtration method, during or after heating and pressing, the material chamber 110 is evacuated, the water vapor in the material chamber 110 is extracted, and the water vapor is discharged after being condensed by cooling water.

[0071] The cooling water used by the condenser 410 can be reclaimed water in the factory area. In order to make full use of the energy carried by the cooling water after heat exchange in the condenser 410, in some embodiments of the pressure filtration method, the cooling water after condensation heat exchange is used to directly or indirectly heat the first medium, thereby reducing the energy waste of the pressure filtration equipment.

[0072] It can be understood that the cooling water directly heating the first medium means that the cooling water leaving the condenser 410 is sent to the first heat exchanger 210 to directly exchange heat with the first medium, and the cooling water indirectly heating the first medium means that the cooling water leaving the condenser 410 is sent to the second heat exchanger 240 to indirectly exchange heat with the first medium through the second medium.

[0073] In some embodiments, the pressure filtration equipment further includes a feed passage 350 and a chemical addition passage 360.

[0074] The feed passage 350 is provided with a thickener 430, a conditioning tank 440, and a mixer 450. The raw sludge is sent to the thickener 430 by a lift pump, and a polymer flocculant and an iron / aluminum salt coagulant are added for mixing and flocculation to improve its water permeability. The sludge is concentrated by the thickener 430, and the water content of the raw sludge is concentrated from 99% to 95 - 97%. Then it enters the conditioning tank 440 for conditioning, and after conditioning, it is sent to the material chamber 110. The mixer 450 is located between the conditioning tank 440 and the material chamber 110.

[0075] The chemical addition passage 360 is provided with a chemical tank 460. The chemical tank 460 communicates with the thickener 430 and the mixer 450 respectively through two chemical addition passages 360 to add chemicals to the thickener 430 and the mixer 450.

[0076] In some embodiments, the filter press device further includes a backflush passage 370, and the backflush passage 370 communicates with the conditioning tank 440 and the material chamber 110. After the feeding through the feeding passage 350 into the material chamber 110 is completed, the backflush passage 370 is opened, and compressed air is used to backflush the feeding passage 350 to clean the residual water and sludge in the filter press device.

[0077] In some embodiments, the filter press device further includes a control component, which consists of a power distribution cabinet, a PLC system, an on-line monitoring display, etc., to achieve automatic or manual operation control of steps such as feeding, filtering, heating, drying, discharging, etc. The control component can adjust the operation process parameters of the filter press device on site, has functions such as operation status display and fault alarm, and is equipped with an emergency stop device, which can effectively protect the safety of the staff.

[0078] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0079] In some alternative embodiments, the functions / operations mentioned in the block diagrams may not occur in the order mentioned in the operation diagrams. For example, depending on the functions / operations involved, two consecutive blocks shown may actually be executed substantially simultaneously or the blocks can sometimes be executed in the reverse order. In addition, the embodiments presented and described in the flowcharts of the present application are provided by way of example for the purpose of providing a more comprehensive understanding of the technology. The disclosed methods are not limited to the operations and logical flows presented herein. Alternative embodiments are contemplated, in which the order of various operations is changed and the sub-operations described as part of a larger operation are executed independently.

[0080] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A pressure filtration device, characterized in that, Including: A heating and pressing assembly, which forms a material chamber and a pressing chamber. The heating and pressing assembly includes an elastically deformable diaphragm. The material chamber and the pressing chamber are separated by the diaphragm. The material chamber is used to accommodate sludge. A first heat exchanger, which is communicated with the pressing chamber. A first circuit is formed between the first heat exchanger and the pressing chamber. The first circuit is used to accommodate a first medium. The first medium can circulate in the first circuit. The first heat exchanger can heat the first medium to heat the sludge located in the material chamber through the diaphragm. The first medium is used to expand the pressing chamber to squeeze the sludge located in the material chamber through the diaphragm. A second heat exchanger, a second circuit is formed between the second heat exchanger and the first heat exchanger. The second circuit is used to accommodate a second medium. The second medium can circulate in the second circuit. The second medium is used to heat the first medium.

2. The pressure filtration device according to claim 1, characterized in that, The filter press device includes a pressure reducing valve and a compressor. The pressure reducing valve and the compressor are arranged in the first circuit. The pressure reducing valve is located upstream of the first heat exchanger, and the compressor is located downstream of the first heat exchanger. The first medium is a refrigerant.

3. The pressure filtration device according to claim 1, wherein The filter press device includes a pressure reducing valve and a compressor. The pressure reducing valve and the compressor are arranged in the second circuit. The pressure reducing valve is located upstream of the second heat exchanger, and the compressor is located downstream of the second heat exchanger. The second medium is a refrigerant.

4. The pressure filtration device according to claim 3, characterized in that, The filter press device includes a filter press pump. The filter press pump is arranged in the first circuit. The filter press pump is located downstream of the first heat exchanger. The filter press pump is used to pump the first medium to the pressing chamber. The first medium is water.

5. The pressure filtration device according to claim 1, characterized in that, The heating and pressing assembly includes one of the following ways: The heating and pressing assembly includes a diaphragm filter plate and a porous filter plate. The porous filter plates and the diaphragm filter plates are arranged alternately. The diaphragm filter plate forms the pressing chamber. The material chamber is formed between the porous filter plate and the diaphragm filter plate. The diaphragm filter plate includes the diaphragm. The porous filter plate includes a porous plate for filtering filtrate. The heating and pressing assembly includes a diaphragm filter plate and a plate frame covered with filter cloth. The plate frame and the diaphragm filter plate are arranged alternately. The diaphragm filter plate forms the pressing chamber. The material chamber is formed between the filter cloth and the diaphragm filter plate. The diaphragm filter plate includes the diaphragm.

6. A pressure filtration method, characterized in that, The filter press method uses the filter press device according to any one of claims 1 to 5. The filter press method includes the following steps: Feeding sludge into the material chamber; Feeding the first medium heated by the first heat exchanger into the pressing chamber. The first medium heats the pressing chamber and expands the pressing chamber to heat and press the sludge, and at the same time discharges the filtrate. After the first medium exchanges heat in the pressing chamber, it returns to the first heat exchanger through the first circuit to be heated again.

7. The pressure filtration method according to claim 6, characterized in that, During or after the heating and pressing, evacuate the material chamber to extract the water vapor in the material chamber. The water vapor is condensed by cooling water and then discharged.

8. The pressure filtration method according to claim 7, wherein The cooling water after using condensation heat exchange directly or indirectly heats the first medium.

9. The pressure filtration method according to claim 6, wherein The first medium undergoes a Carnot cycle in the first circuit, and a third medium heats the first medium through the first heat exchanger. The third medium is a gaseous or liquid substance, and the first medium heats and pressurizes the pressing cavity; alternatively, a second medium undergoes a Carnot cycle in the second circuit, and a third medium heats the second medium through the second heat exchanger. The third medium is a gaseous or liquid substance, the second medium heats the first medium, and a high-pressure water pump located in the first circuit pressurizes the first medium, thereby heating and pressurizing the pressing cavity.

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