MVR evaporation crystallization condensate water recycling purification device

Abstract

The utility model belongs to water treatment technical field, concretely relates to a kind of MVR evaporation crystallization condensate reuse purification treatment device, including the condensate collection tank, first water pump, main heat exchanger, multi-medium filter and precision filter group connected by pipeline sequentially, characterized by: precision filter group is set to parallel first precision filter and second precision filter;First water quality sensor is equipped on the inlet header of precision filter group;Second water quality sensor is arranged on the outlet pipeline of first precision filter;There is third water quality sensor on the outlet pipeline of second precision filter;Electromagnetic valve is equipped on the import, export and backflushing pipeline of first precision filter and second precision filter;Device further includes a backflushing water pump and a backflushing air pump and a PLC controller;Backflushing water pump and backflushing air pump outlet end are connected with multi-medium filter and precision filter group.The utility model has the advantages of reasonable structure, efficient treatment.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment technology, specifically relating to an MVR evaporation crystallization condensate recycling and purification treatment device. Background Technology

[0002] Mechanical vapor recompression (MVR) evaporation crystallization technology, due to its high efficiency and energy saving, has been widely used in wastewater treatment in industries such as chemical, pharmaceutical, food, and environmental protection to achieve the separation and recovery of water and solutes. In an MVR system, the secondary steam generated by material evaporation is pressurized and heated by a compressor, and then returned to the heater for recycling as a heat source. The steam condenses after heat exchange to form condensate.

[0003] Theoretically, this condensate should be of high purity and could be directly reused. However, in actual operation, due to system leaks, liquid entrainment, and the volatilization of low-boiling-point organic matter in the materials, the produced condensate still contains a certain amount of suspended solids, colloids, ions, and even organic matter. If directly reused in boiler feedwater or process water, it will cause scaling and corrosion of equipment, affecting product quality; if directly discharged, it will waste valuable water resources and the large amount of heat energy contained in the condensate (usually at temperatures above 70℃).

[0004] Currently, MVR condensate treatment often employs single ion exchange or membrane methods. However, these methods suffer from high operating costs, susceptibility to contamination, the need for frequent regeneration or replacement, and a failure to effectively recover heat energy. Therefore, developing an integrated device capable of effectively purifying MVR condensate and recovering its heat energy is of great significance for achieving "zero discharge" of wastewater and reducing production costs. Utility Model Content

[0005] The purpose of this invention is to provide an MVR evaporation crystallization condensate recycling and purification device that overcomes the shortcomings of the prior art and provides an MVR evaporation crystallization condensate recycling and purification device with a reasonable structure, high efficiency, and heat recovery capability.

[0006] The specific technical solution adopted by this utility model is as follows: A purification and treatment device for MVR evaporation crystallization condensate reuse includes a condensate collection tank, a first water pump, a main heat exchanger, a multi-media filter, and a precision filter group connected in sequence by pipelines. The device is characterized in that: the precision filter group consists of a first precision filter and a second precision filter connected in parallel; a first water quality sensor is installed on the inlet main pipe of the precision filter group; a second water quality sensor is installed on the outlet pipe of the first precision filter; a third water quality sensor is installed on the outlet pipe of the second precision filter; solenoid valves are installed on the inlet, outlet, and backwash pipes of the first and second precision filters; the device further includes a backwash water pump, a backwash air pump, and a PLC controller; the outlet ends of the backwash water pump and the backwash air pump are connected to the multi-media filter and the precision filter group.

[0007] Preferably, it further includes a backwash wastewater heat recovery unit; the backwash wastewater heat recovery unit includes: A wastewater heat recovery tank is used to collect backwash wastewater from the multi-media filter and the precision filter assembly.

[0008] Preferably, the backwash wastewater heat recovery unit further includes a wastewater heat exchanger, whose heat medium inlet is connected to the outlet of the wastewater heat recovery tank via a pipeline, and whose heat medium outlet is connected to the sewage discharge pipe. The cold medium inlet of the wastewater heat exchanger is connected to the raw water supply pipeline, and its cold medium outlet is connected to the cold medium inlet of the main heat exchanger, forming a second-stage heat recovery loop.

[0009] Preferably, the inlet end of the backwash water pump is connected in a through connection with the wastewater heat recovery tank.

[0010] Preferably, the PLC controller is further configured to: compare the water quality data detected by the first water quality sensor with a preset threshold, and when the water quality is better than the threshold, increase the water flow rate by controlling the valve.

[0011] Preferably, the main heat exchanger is a plate heat exchanger, with its hot medium inlet connected to condensate from the MVR system and its cold medium inlet connected to the raw water to be preheated.

[0012] The technical effects achieved by this utility model are as follows: This invention does not simply add a backup filter; rather, it organically integrates multiple technical features such as parallel filtration, air-water cleaning, and heat recovery into a collaborative whole through intelligent control, resulting in the following unexpected technical effects: It ensures the absolute continuity of reclaimed water supply, providing crucial support for the stable operation of the MVR main system. Through efficient air-water cleaning and cascaded heat recovery, it significantly reduces operation and maintenance costs and overall system energy consumption. It achieves an evolution from a "fixed process" to an "intelligent flexible process," adaptively adjusting operating strategies based on water quality, making it a creative solution that integrates reliability, efficiency, and intelligence. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of an MVR evaporation crystallization condensate recycling and purification treatment device according to this utility model; Figure 2 This is a top view schematic diagram of an MVR evaporation crystallization condensate recycling and purification treatment device according to this utility model.

[0014] The attached diagram lists the components represented by each number as follows: 1. Condensate collection tank; 2. First water pump; 3. Main heat exchanger; 4. Multi-media filter; 5. Precision filter assembly; 6. Backwash water pump; 7. Backwash air pump; 8. Wastewater heat recovery tank; 9. Wastewater heat exchanger; 101. First water quality sensor; 102. Second water quality sensor; 103. Third water quality sensor; 51. First precision filter; 52. Second precision filter. Detailed Implementation

[0015] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0016] like Figures 1-2As shown, an MVR evaporation crystallization condensate recycling and purification device includes a condensate collection tank 1, a first water pump 2, a main heat exchanger 3, a multi-media filter 4, and a precision filter group 5 connected in sequence by pipelines. The device is characterized in that: the precision filter group 5 is configured as a first precision filter 51 and a second precision filter 52 connected in parallel; a first water quality sensor 101 is installed on the inlet main pipe of the precision filter group 5; a second water quality sensor 102 is installed on the outlet pipe of the first precision filter 51; a third water quality sensor 103 is installed on the outlet pipe of the second precision filter 52; solenoid valves are installed on the inlet, outlet, and backwash pipes of the first and second precision filters 51 and 52; the device also includes a backwash water pump 6, a backwash air pump 7, and a PLC controller; the outlet ends of the backwash water pump 6 and the backwash air pump 7 are connected to the multi-media filter 4 and the precision filter group 5.

[0017] like Figures 1-2 As shown, the filter media of the multi-media filter 4 includes anthracite, quartz sand, and magnetite arranged sequentially from top to bottom. The filtration accuracy of the precision filter assembly 5 is 1μm-10μm. like Figures 1-2 As shown, the purification treatment device also includes a control system. The configuration of the control system and the specific signal transmission are common knowledge to those skilled in the art and will not be described in detail here.

[0018] A PLC controller, the signal input terminal of which is electrically connected to the first water quality sensor 101, the second water quality sensor 102, and the third water quality sensor 103; The control terminals of multiple solenoid valves are electrically connected to the signal output terminals of the PLC controller; The start and stop of the backwash water pump 6 and the backwash air pump 7 are controlled by the PLC controller. The PLC controller is configured to automatically control the switching state of the corresponding solenoid valve based on the readings of the second water quality sensor 102 and the third water quality sensor 103, so that when a single precision filter is performing air-water coordinated backwashing, another precision filter can be automatically put into operation to ensure uninterrupted water production.

[0019] By setting up five parallel precision filter groups and a PLC-controlled multi-sensor valve actuator system, "online monitoring, intelligent judgment, automatic switching, and uninterrupted operation" are achieved. When the system detects that the differential pressure of a filter exceeds the standard or the turbidity of the effluent is abnormal, it can automatically isolate the filter and backwash it, without needing to switch to a standby filter to continue water production. This fundamentally solves the pain point of traditional single-filter devices requiring shutdown for maintenance, greatly improving the system's reliability and automation level.

[0020] like Figures 1-2 As shown, preferably, it further includes a backwash wastewater heat recovery unit; the backwash wastewater heat recovery unit includes: A wastewater heat recovery tank 8 is used to collect backwash wastewater from the multi-media filter 4 and the precision filter assembly 5; Preferably, the backwash wastewater heat recovery unit further includes a wastewater heat exchanger 9, whose heat medium inlet is connected to the outlet of the wastewater heat recovery tank 8 via a pipeline, and whose heat medium outlet is connected to the sewage discharge pipe. The cold medium inlet of the wastewater heat exchanger 9 is connected to the raw water supply pipeline, and its cold medium outlet is connected to the cold medium inlet of the main heat exchanger 3, forming a second-stage heat recovery loop.

[0021] Preferably, the inlet end of the backwash water pump 6 is connected in a through connection to the wastewater heat recovery tank 8.

[0022] Preferably, the PLC controller is further configured to: compare the water quality data detected by the first water quality sensor 101 with a preset threshold, and when the water quality is better than the threshold, increase the water flow rate by controlling the valve to reduce system pressure loss and energy consumption.

[0023] The specific process of the air-water synergistic backwashing is as follows: first, compressed air is used for air scrubbing to loosen the dirt on the filter element surface, and then purified water is used for pulse water rinsing. This process is repeated once or multiple times.

[0024] like Figures 1-2 As shown, this invention employs a pulse-type backwashing mode of "air first, then water" or "alternating air and water." The agitation and scrubbing action of compressed air effectively loosens the rigid scale and colloids deeply attached to the filter element, which are then thoroughly removed by the subsequent water pulses. This cleaning method is more efficient than traditional single-water washing, better restores the filter element's filtration performance, and extends its service life.

[0025] Preferably, the main heat exchanger 3 is a plate heat exchanger, with its hot medium inlet connected to condensate from the MVR system and its cold medium inlet connected to the raw water to be preheated.

[0026] The working principle of this utility model is as follows: The working process of the MVR evaporation crystallization condensate recycling and purification device in this embodiment is as follows: The approximately 70-90°C high-temperature condensate from the MVR evaporation crystallization system first enters the condensate collection tank 1 for temporary storage. Subsequently, it is pumped by the first water pump 2 into the cold medium channel of the plate heat exchanger 3. Inside the heat exchanger 3, the high-temperature condensate exchanges heat with ambient-temperature raw water entering from another inlet. The condensate is cooled to below 40°C, while the raw water is preheated. This process recovers the waste heat from the condensate.

[0027] The cooled condensate enters the multi-media filter 4, where most suspended solids and colloids are removed. It then flows into a 5μm precision filter assembly 5, where dissolved organic matter and odors are adsorbed and removed, and a security filter is applied to thoroughly remove fine particles. The purified water then enters the wastewater heat recovery tank 8, where it can be reused as high-quality process water or boiler feedwater.

[0028] Based on the readings of the second water quality sensor 102 and the third water quality sensor 103, the on / off state of the corresponding solenoid valve is automatically controlled so that when a single precision filter is performing air-water synergistic backwashing, another precision filter can be automatically put into operation to ensure uninterrupted water production. First, compressed air is used for air wiping to loosen the dirt on the surface of the filter element. Then, purified water is used for pulse water rinsing. Specifically, the water inlet of the backwash water pump 6 is drawn from the wastewater heat recovery tank 8 and sprayed at high pressure onto the first precision filter 51 or the second precision filter 52 in the multi-media filter 4 or the precision filter group 5. This process is repeated once or multiple times.

[0029] like Figures 1-2 As shown, this invention employs a pulse-type backwashing mode of "air first, then water" or "alternating air and water." The agitation and scrubbing action of compressed air effectively loosens the rigid scale and colloids deeply attached to the filter element, which are then thoroughly removed by the subsequent water pulses. This cleaning method is more efficient than traditional single-water washing, better restores the filter element's filtration performance, and extends its service life.

[0030] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A purification and treatment device for MVR evaporation crystallization condensate reuse, characterized in that: The device includes a condensate collection tank (1), a first water pump (2), a main heat exchanger (3), a multi-media filter (4), and a precision filter group (5) connected in sequence by pipes. The precision filter group (5) is configured as a first precision filter (51) and a second precision filter (52) connected in parallel. A first water quality sensor (101) is installed on the inlet main pipe of the precision filter group (5). A second water quality sensor (102) is installed on the outlet pipe of the first precision filter (51). A third water quality sensor (103) is installed on the outlet pipe of the second precision filter (52). Solenoid valves are installed on the inlet, outlet, and backwash pipes of the first precision filter (51) and the second precision filter (52). The device also includes a backwash water pump (6), a backwash air pump (7), and a PLC controller. The outlet ends of the backwash water pump (6) and the backwash air pump (7) are connected to the multi-media filter (4) and the precision filter group (5).

2. The MVR evaporation crystallization condensate recycling and purification device according to claim 1, characterized in that: It also includes a backwash wastewater heat recovery unit; the backwash wastewater heat recovery unit includes: A wastewater heat recovery tank (8) is used to collect backwash wastewater from the multi-media filter (4) and the precision filter assembly (5).

3. The MVR evaporation crystallization condensate recycling and purification device according to claim 2, characterized in that: The backwash wastewater heat recovery unit also includes a wastewater heat exchanger (9), whose heat medium inlet is connected to the outlet of the wastewater heat recovery tank (8) through a pipe, and whose heat medium outlet is connected to the sewage discharge pipe. The cold medium inlet of the wastewater heat exchanger (9) is connected to the raw water supply pipeline, and its cold medium outlet is connected to the cold medium inlet of the main heat exchanger (3), forming a second-stage heat recovery loop.

4. The MVR evaporation crystallization condensate recycling and purification treatment device according to claim 3, characterized in that: The inlet of the backwash water pump (6) is connected to the wastewater heat recovery tank (8).

5. The MVR evaporation crystallization condensate recycling and purification treatment device according to claim 4, characterized in that: The PLC controller is also configured to: compare the water quality data detected by the first water quality sensor (101) with a preset threshold, and increase the water flow rate by controlling the valve when the water quality is better than the threshold.

6. The MVR evaporation crystallization condensate recycling and purification treatment device according to claim 5, characterized in that: The main heat exchanger (3) is a plate heat exchanger, with its hot medium inlet connected to the condensate from the MVR system and its cold medium inlet connected to the raw water to be preheated.

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