Heat recovery system for membrane filtration equipment

Abstract

The utility model discloses a heat recovery system for membrane filtration equipment, which belongs to the technical field of heat recovery and comprises a stock solution tank, a feed pump, a security filter, a multi-section heat exchanger, a plate heat exchanger, a heat exchange water pump, a slow-temperature water tank, a membrane system, a concentrated solution storage tank and a permeate storage tank. Hot water in a factory enters the plate heat exchanger to raise water in the slow-temperature water tank, raw materials are pumped out through the feeding pump, filtered through the security filter and then fed into the multi-section heat exchanger, and the water in the slow-temperature water tank is raised to 35-45 DEG C through the arranged plate heat exchanger; raw materials are pumped out by the feeding pump, filtered by the security filter and then fed into the multi-section heat exchanger, heated water enters the multi-section heat exchanger through the heat exchange pump to exchange heat with the raw materials, and the raw materials after the temperature reaches 25-30 DEG C and then enter the membrane system to be separated, so that the treatment efficiency of the membrane system is improved by 30-50%.

Description

Technical Field

[0001] The utility model belongs to the field of heat recovery technology, in particular to a heat recovery system for membrane filtering equipment. Background Art

[0002] Membrane filtration is a precision separation technology that can achieve molecular-level filtration. It uses the selective permeability of membrane pores to separate two phases. The pressure difference on both sides of the membrane is used as the driving force to allow solvents, inorganic ions, small molecules, etc. to pass through the membrane, while retaining particles and macromolecules.

[0003] Membrane separation technology has been widely used in water purification or liquid filtration and separation. Such membrane filtration equipment or devices have different numbers of filtration membrane elements according to the different water treatment requirements. In order to achieve long-term stable operation, they also need to integrate functional components such as pumps, valves, instruments and electrical controls. Because of their complex structure and strong professional and technical requirements, these devices must be produced in factories or constructed by a large number of professionals at the project site. In rural life

[0004] During membrane filtration, the membrane treatment efficiency becomes low at low temperatures. If the temperature is raised before treatment, the temperature of the membrane concentrate and permeate after treatment will be high and difficult to preserve. In addition, the heat is seriously wasted during the heating process and such raw materials will deteriorate when the temperature is too high. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] To solve the above problems, the utility model adopts the following technical solutions.

[0007] A heat recovery system for membrane filtration equipment includes a raw liquid tank, a feed pump, a security filter, a multi-stage heat exchanger, a plate heat exchanger, a heat exchange water pump, a slow-temperature water tank, a membrane system, a concentrate storage tank and a permeate storage tank. Normal temperature pure water from a factory enters the slow-temperature water tank, hot water from the factory enters the plate heat exchanger to raise the water level in the slow-temperature water tank, a feed pump extracts the raw material and sends it to the multi-stage heat exchanger after filtering it through the security filter, and the heated water enters the multi-stage heat exchanger through the heat exchange pump to perform heat exchange with the raw material so that the raw material reaches the production temperature and enters the membrane system for separation.

[0008] Preferably, the multi-stage heat exchanger is divided into one section, two sections and three sections. The hot water in the slow-temperature water tank enters the third section of the multi-stage heat exchanger. After the raw materials undergo heat exchange through the first section and the second section of the multi-stage heat exchanger, they enter the third section of the multi-stage heat exchanger to undergo heat exchange with the hot water in the slow-temperature water tank to reach a suitable production temperature.

[0009] Preferably, the raw material enters the membrane system for separation to produce concentrated liquid and permeate, the concentrated liquid enters the first section of the multi-section heat exchanger for heat exchange with the raw material, and the permeate enters the second section of the multi-section heat exchanger for heat exchange with the raw material.

[0010] Preferably, the temperature of the hot water is reduced after heat exchange, and the hot water with reduced temperature is returned to the slow-temperature water tank through a heat exchange water pump.

[0011] Preferably, the concentrated liquid after heat exchange is stored in a concentrated liquid storage tank, and the permeated liquid after heat exchange is stored in a permeated liquid storage tank.

[0012] Preferably, the temperature of the raw material after heat exchange in the multi-stage heat exchanger reaches 25°C-30°C.

[0013] Preferably, the water in the slow-temperature water tank is heated to 35°C-45°C after being heated by the plate heat exchanger.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The water in the slow-temperature water tank is raised to 35-45°C by the plate heat exchanger, the feed pump extracts the raw material and sends it to the multi-stage heat exchanger after filtering through the safety filter. The heated water enters the multi-stage heat exchanger through the heat pump to exchange heat with the raw material. The raw material temperature after exchange reaches 25-30°C and enters the membrane system for separation, thereby increasing the processing efficiency of the membrane system by 30%-50%. By setting up a multi-stage heat exchanger, the membrane concentrate and permeate after membrane treatment enter the heat exchanger separately for heat exchange, thereby reducing the temperature and being suitable for long-term storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic diagram of a heat recovery system framework for membrane filtration equipment.

[0017] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0018] 100. Raw liquid tank; 101. Feed pump; 102. Safety filter; 103. Multi-stage heat exchanger; 104. Plate heat exchanger; 105. Heat exchange water pump; 106. Buffer water tank; 107. Membrane system; 108. Concentrate storage tank; 109. Permeate storage tank. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. The present invention provides the following embodiments.

[0022] like Figure 1 1 is a schematic diagram of a heat recovery system for a membrane filtration device according to a preferred embodiment of the utility model. The heat recovery system for a membrane filtration device according to this embodiment includes a raw liquid tank 100, a feed pump 101, a security filter 102, a multi-stage heat exchanger 103, a plate heat exchanger 104, a heat exchange water pump 105, a slow-temperature water tank 106, a membrane system 107, a concentrate storage tank 108 and a permeate storage tank 109. The normal temperature pure water of the factory enters the slow-temperature water tank 106. In the process, the hot water in the factory enters the plate heat exchanger 104 to raise the water in the slow-temperature water tank 106 to 35°C-45°C, the feed pump 101 extracts the raw material and sends it to the multi-stage heat exchanger 103 after filtering through the safety filter 102, the heated water enters the multi-stage heat exchanger 103 through the heat pump to exchange heat with the raw material, and the raw material temperature after exchange reaches 25°C-30°C and enters the membrane system 107 for separation, thereby increasing the processing efficiency of the membrane system 107 by 30%-50%.

[0023] like Figure 1 As shown, the multi-stage heat exchanger 103 is divided into one stage, two stages and three stages. The raw material enters the membrane system 107 for separation to produce concentrated liquid and permeate. The concentrated liquid enters the first stage of the multi-stage heat exchanger 103 to exchange heat with the raw material. The temperature of the concentrated liquid after the exchange is still low, which saves energy consumption during subsequent storage. The permeate enters the second stage of the multi-stage heat exchanger 103 to exchange heat with the raw material. The temperature of the permeate after the exchange is still low, which can also save energy consumption during subsequent storage.

[0024] like Figure 1As shown, the hot water in the slow-temperature water tank 106 enters the third section of the multi-section heat exchanger 103. After the raw materials undergo heat exchange through the first and second sections of the multi-section heat exchanger 103, they enter the third section of the multi-section heat exchanger 103 to undergo heat exchange with the hot water in the slow-temperature water tank 106 to reach a suitable production temperature.

[0025] like Figure 1 As shown, the temperature of the hot water is reduced after heat exchange, and the hot water with reduced temperature is returned to the slow-temperature water tank 106 through the heat exchange water pump 105. The concentrated liquid after heat exchange enters the concentrated liquid storage tank 108 for storage, and the permeate after heat exchange enters the permeate storage tank 109 for storage.

[0026] This embodiment also provides a heat recovery method for a membrane filtration device, which uses the above-mentioned heat recovery system. The specific method is as follows:

[0027] Step 1: The normal temperature pure water of the factory enters the slow temperature water tank 106, and the hot water of the factory enters the plate heat exchanger 104 to heat the normal temperature pure water inside the slow temperature water tank 106;

[0028] Step 2: After the room temperature pure water is heated to a specified temperature, it is transported to the third section of the multi-section heat exchanger 103 through the heat exchange water pump 105. The feed pump 101 draws the raw material into the multi-section heat exchanger 103 for heat exchange with the hot water. After the raw material reaches a suitable temperature, it is transported to the membrane system 107 for separation;

[0029] Step 4: After the raw materials are separated, a concentrated liquid and a permeate are generated. The concentrated liquid enters the first section of the multi-section heat exchanger 103 to exchange heat with the raw materials. The temperature of the concentrated liquid after the exchange is still low, which saves energy consumption during subsequent storage. The permeate enters the second section of the multi-section heat exchanger 103 to exchange heat with the raw materials. The temperature of the permeate after the exchange is still low, which can also save energy consumption during subsequent storage.

[0030] Step 5: After the hot water is cooled, it flows back to the slow-temperature water tank 106 through the ring heat pump. The concentrated liquid after heat exchange enters the concentrated liquid storage tank 108 for storage, and the permeate after heat exchange enters the permeate storage tank 109 for storage.

[0031] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. A heat recovery system for a membrane filtration device, characterized in that: The system comprises a raw liquid tank (100), a feed pump (101), a security filter (102), a multi-stage heat exchanger (103), a plate heat exchanger (104), a heat exchange water pump (105), a slow-temperature water tank (106), a membrane system (107), a concentrate storage tank (108) and a permeate storage tank (109). The normal temperature pure water of the factory enters the slow-temperature water tank (106), the hot water in the factory enters the plate heat exchanger (104) to raise the water temperature in the slow-temperature water tank (106), the feed pump (101) extracts the raw material and filters it through the security filter (102), and then sends it to the multi-stage heat exchanger (103). The heated water enters the multi-stage heat exchanger (103) through the heat exchange pump to exchange heat with the raw material so that the raw material reaches the production temperature and enters the membrane system (107) for separation.

2. The heat recovery system for membrane filtration equipment according to claim 1, characterized in that: The multi-stage heat exchanger (103) is divided into the first stage, the second stage and the third stage. The hot water in the buffer water tank (106) enters the third stage of the multi-stage heat exchanger (103). After the raw materials enter the first stage and the second stage of the multi-stage heat exchanger (103) for heat exchange, they enter the third stage of the multi-stage heat exchanger (103) for heat exchange with the hot water in the buffer water tank (106) to reach a suitable production temperature.

3. The heat recovery system for membrane filtration equipment according to claim 2, characterized in that: The raw material enters the membrane system (107) for separation to produce a concentrated liquid and a permeate. The concentrated liquid enters the first section of the multi-section heat exchanger (103) for heat exchange with the raw material, and the permeate enters the second section of the multi-section heat exchanger (103) for heat exchange with the raw material.

4. The heat recovery system for membrane filtration equipment according to claim 3, characterized in that: The temperature of the hot water is reduced after heat exchange, and the hot water with reduced temperature is returned to the slow-temperature water tank (106) through the heat exchange water pump (105).

5. The heat recovery system for membrane filtration equipment according to claim 4, characterized in that: The concentrated liquid after heat exchange enters the concentrated liquid storage tank (108) for storage, and the permeated liquid after heat exchange enters the permeated liquid storage tank (109) for storage.

6. The heat recovery system for membrane filtration equipment according to claim 5, characterized in that: The temperature of the raw material after heat exchange in the multi-stage heat exchanger (103) reaches 25°C-30°C.

7. The heat recovery system for membrane filtration equipment according to claim 6, characterized in that: After being heated by the plate heat exchanger (104), the water in the slow-temperature water tank (106) rises to 35°C-45°C.

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