High-temperature-resistant wastewater recovery and purification device

Abstract

The utility model relates to wastewater recovery and treatment technical field relates to a kind of high-temperature wastewater recovery and purification device.It includes heater, filter device, heat exchanger and the pipeline for connecting each equipment;Heat exchanger connects the wastewater of boiler discharge, for carrying out first heating to wastewater;Heater is used to carry out secondary heating to the wastewater after heat exchanger preheating, and high-temperature waste steam is generated;Filter device carries out filtration to high-temperature waste steam, and generates clean steam;Clean steam is connected the input end of heat exchanger by pipeline, as heat source, preheats for wastewater;Condensed steam forms clean water and discharges device outside.The utility model utilizes wastewater in heat exchanger beforehand heat exchange temperature rise, and the energy consumption of heater is reduced;Heater heats to steam and carries out filtration;Clean air after filtration then as the heat source of heat exchanger preheats wastewater;Wastewater temperature rises after heat exchange, and the heat required for high-temperature steam is reduced, and heat energy is fully utilized, and resource is saved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater recycling and treatment technology, and in particular to a high-temperature resistant wastewater recycling and purification device. Background Technology

[0002] Boilers are commonly used devices in industrial production to provide heat. During operation, boilers continuously evaporate pure steam, leaving dissolved solids such as sulfates, chlorides, and silicates, as well as suspended solids, inside the boiler drum. To prevent the concentration of these impurities from escalating indefinitely and causing scaling, corrosion, and steam-water bubbling, high-concentration boiler water must be continuously discharged from the surface of the boiler drum. For low-pressure boilers, the blowdown temperature is typically between 80 and 120 degrees Celsius. Boiler wastewater mainly contains suspended solids, sulfates, chlorides, and trace heavy metals. Many of these substances are classified as Class I pollutants, which are subject to strict control under national environmental standards. Direct discharge would cause significant environmental pollution, therefore, wastewater must be purified before discharge. Thus, solving the problems of wastewater purification and heat recovery has become an urgent technical challenge. Utility Model Content

[0003] The purpose of this invention is to address the problems existing in the background technology by proposing a high-temperature resistant wastewater recovery and purification device.

[0004] The technical solution of this utility model is a high-temperature resistant wastewater recovery and purification device, which includes a heater, a filter device, a heat exchanger, and pipelines for connecting the various devices. The heat exchanger is connected to the wastewater discharged from the boiler and is used for primary heating of the wastewater; The heater is used to reheat the wastewater that has been preheated by the heat exchanger and generate high-temperature waste steam. The filtration device filters the high-temperature waste steam and generates clean steam; the clean steam is connected to the input end of the heat exchanger through a pipeline to preheat the wastewater; the condensed steam forms clean water and is discharged outside the device.

[0005] Preferably, the heat exchanger includes two input terminals and two output terminals, namely a first input terminal, a second input terminal, a first output terminal, and a second output terminal; The two media within the heat exchange chamber of the heat exchanger are completely isolated, and only heat exchange occurs; Wastewater enters from the first input terminal and exits from the first output terminal; clean steam enters from the second output terminal and exits from the second output terminal. Alternatively, wastewater can be input from the second input terminal and output from the second output terminal; clean steam can be input from the first output terminal and output from the first output terminal.

[0006] Preferably, the heater heats the preheated wastewater to generate steam at a temperature of 120 degrees Celsius or higher.

[0007] Preferably, the impurities in the wastewater include suspended solids, sulfates, chlorides, and trace heavy metals.

[0008] Preferably, the filtration device is equipped with a high-temperature resistant, removable filter screen; the filter screen is arranged in multiple layers in the steam flow channel to filter impurities in the waste steam.

[0009] Preferably, the filter screen needs to be removed, cleaned, and reused after a period of use.

[0010] Preferably, the heat exchanger is a tubular heat exchanger or a plate heat exchanger.

[0011] Compared with the prior art, the present invention has the following beneficial technical effects: This invention utilizes preheating of wastewater in a heat exchanger to reduce heater energy consumption. After the heater heats the wastewater to steam, it is filtered, resulting in significantly improved gas filtration compared to liquid filtration. The filtered clean air then serves as the heat source for the heat exchanger to preheat the wastewater. This fully utilizes the wastewater's own energy, requiring only the heater as the energy-consuming device, which, combined with the filtration unit, completes the entire filtration and purification process. The filter element can be periodically disassembled for cleaning and reuse. The increased temperature of the wastewater after heat exchange greatly reduces the amount of heat required to directly heat the wastewater into high-temperature steam, thus maximizing thermal energy utilization and conserving resources. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of the filtration device in an embodiment of this utility model; Figure 3 This is a schematic diagram of the internal structure of the filter device in an embodiment of this utility model; Figure 4 This is a structural schematic diagram of the filter device in its unfolded state in an embodiment of this utility model.

[0013] Reference numerals: 1. Filter device; 11. Input end; 12. Outer shell; 13. Output end; 14. Rubber strip; 15. Through hole; 16. Movable retaining ring; 2. Discharge end; 21. Discharge port; 22. Chamber; 3. Filter element; 31. Support layer; 32. Limiting ring; 33. Filter membrane. Detailed Implementation Example

[0014] like Figure 1As shown, the present invention proposes a high-temperature resistant wastewater recycling and purification device, which includes a heater, a filter device, a heat exchanger, and pipelines for connecting the various devices. The heat exchanger is connected to the wastewater discharged from the boiler and is used for primary heating of the wastewater; The heater is used to reheat the wastewater that has been preheated by the heat exchanger and generate high-temperature waste steam. The filtration device filters the high-temperature waste steam and generates clean steam; the clean steam is connected to the input end of the heat exchanger through a pipeline to preheat the wastewater; the condensed steam forms clean water and is discharged outside the device.

[0015] In this embodiment, as Figure 1 As shown, the heat exchanger can be a tubular heat exchanger or a plate heat exchanger; specifically, the heat exchanger includes two inlet ends and two outlet ends, namely a first inlet end, a second inlet end, a first outlet end, and a second outlet end; the two media in the heat exchange chamber of the heat exchanger are completely isolated and only exchange heat. For example: wastewater is input from the first input terminal and output from the first output terminal; clean steam is input from the second output terminal and output from the second output terminal. Alternatively, wastewater can be input from the second input terminal and output from the second output terminal; clean steam can be input from the first output terminal and output from the first output terminal. It is important to note that the first input terminal is located above the far end of the heat exchanger, while the first output terminal is located below the near end. Correspondingly, the second input terminal is located above the near end of the heat exchanger, and the second output terminal is located below the far end. Therefore, when wastewater is input from the first input terminal and output from the first output terminal, and clean steam is input from the second output terminal and output from the second output terminal, the wastewater flows into the heat exchange chamber from the far end of the heat exchanger. Finned, spiral, or S-shaped heat exchange tubes can be installed in the heat exchange chamber. The wastewater only moves within the heat exchange tubes and flows counter-currently from the far end to the near end; while the clean steam flows forward from the near end to the far end of the heat exchanger. This increases the contact time between the higher-temperature clean steam and the wastewater, enhancing heat exchange efficiency and further heating the wastewater. This reduces the energy required for subsequent heater operation, resulting in greater energy savings.

[0016] In this embodiment, the heater heats the preheated wastewater to generate steam at a temperature of over 120 degrees Celsius.

[0017] In this embodiment, the impurities in the wastewater include suspended solids, sulfates, chlorides, and trace heavy metals. Since the impurities in wastewater vary depending on the type of boiler, the material of the filter element in the filtration device can be adjusted accordingly to improve the final filtration effect.

[0018] In this embodiment, a high-temperature resistant, removable filter screen is installed inside the filtration device. The filter screen is arranged in multiple stacks in the steam flow channel to filter impurities in the waste steam. After a period of use, the filter screen needs to be removed, cleaned, and reused.

[0019] As an alternative solution, such as Figure 2-4 As shown, an implementable filtration device 1 specifically includes an input end 11, a housing 12, an output end 13, and a discharge end 2; like Figure 2 As shown, the heated waste steam enters from the input end 11 of the filtration device 1, and after being filtered by the internal multi-layered filter element 3, the clean steam is discharged from the output end 13. In this embodiment, the outer shell 12 is cylindrical and is used to connect the input end 11 and the output end 13 at both ends, while the discharge end 2 is located below the outer shell 12. The pipeline can connect the input end 11 and the output end 13 for steam guidance. Inside the filtration device 1, the filter element 3 is installed. The filter element 3 is a cylindrical structure with multiple layers of filter membranes 33 stacked inside for filtration. The material of the filter element can be selected according to the type of pollutant, such as high-temperature resistant glass fiber, sintered stainless steel, or polytetrafluoroethylene (PTFE) membrane. The filter element 3 includes a support layer 31 and a limiting ring 32. The length of the filter element 3 is designed to be three-quarters of the length of the outer shell 12. When the filter element 3 is installed in the filtration device 1, there is still a certain space between the tail of the filter element 3 and the output end 13 to facilitate disassembly and maintenance of the output end. Due to the setting of the limiting ring 32, the support layer 31 of the filter element 3 does not contact the outer shell 12, which can reduce the heat transfer to the outside through the outer shell 12.

[0020] A fixed retaining ring and a movable retaining ring 16 are provided inside the outer casing 12. The fixed retaining ring is located on the inner wall of the outer casing 12 and near the output end 13, so that the limiting ring 32 of the filter element 3 can abut against it for limitation. The movable retaining ring 16 can abut against the limiting ring 32 at the other end of the filter element 3. When the input end 11 is threadedly connected and locked with the outer casing 12, the filter element 3 can be kept in a tight state. A rubber strip 14 for sealing the joint is provided on the outer periphery of the outer casing 12. As a preferred embodiment, as follows Figure 4 As shown, the outer shell 12 has a through hole 15 that communicates with the discharge end; during the filtration process, some particles and condensed water droplets will collect in the through hole 15 under the action of gravity and be temporarily stored in the discharge end 2; the discharge end 2 forms a cavity 22 inside, one end of the cavity 22 is inclined and has a discharge port 21, which can be connected to a pipe for sewage discharge.

[0021] As a preferred embodiment, temperature and pressure sensors can also be installed in the filter device 3. By monitoring the temperature difference and pressure difference between the input and output ends, it can be determined whether the filter element is clogged, so that it can be replaced or cleaned in a timely manner.

[0022] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A high-temperature resistant wastewater recovery and purification device, characterized in that, Includes heaters, filters, heat exchangers, and piping for connecting the various devices; The heat exchanger is connected to the wastewater discharged from the boiler and is used for primary heating of the wastewater; The heater is used to reheat the wastewater that has been preheated by the heat exchanger and generate high-temperature waste steam. The filtration device filters the high-temperature waste steam and generates clean steam; the clean steam is connected to the input end of the heat exchanger through a pipeline to preheat the wastewater; the condensed steam forms clean water and is discharged outside the device.

2. The high-temperature resistant wastewater recovery and purification device according to claim 1, characterized in that, The heat exchanger includes two input terminals and two output terminals, namely a first input terminal, a second input terminal, a first output terminal, and a second output terminal; The two media within the heat exchange chamber of the heat exchanger are completely isolated, and only heat exchange occurs; Wastewater enters from the first input terminal and exits from the first output terminal; clean steam enters from the second output terminal and exits from the second output terminal. Alternatively, wastewater can be input from the second input terminal and output from the second output terminal; clean steam can be input from the first output terminal and output from the first output terminal.

3. The high-temperature resistant wastewater recovery and purification device according to claim 1, characterized in that, The heater heats the preheated wastewater to produce steam at a temperature of over 120 degrees Celsius.

4. The high-temperature resistant wastewater recovery and purification device according to claim 1, characterized in that, Impurities in wastewater include suspended solids, sulfates, chlorides, and trace heavy metals.

5. The high-temperature resistant wastewater recovery and purification device according to claim 1, characterized in that, The filtration device is equipped with a high-temperature resistant, removable filter screen; the filter screen is arranged in multiple layers in the steam flow channel to filter impurities in the waste steam.

6. The high-temperature resistant wastewater recovery and purification device according to claim 5, characterized in that, After a period of use, the filter screen needs to be removed, cleaned, and reused.

7. The high-temperature resistant wastewater recovery and purification device according to claim 1, characterized in that, The heat exchanger is either a tubular heat exchanger or a plate heat exchanger.

8. The high-temperature resistant wastewater recovery and purification device according to claim 1, characterized in that, The filtration device specifically includes an inlet, a housing, an outlet, and a discharge outlet; The heated waste steam enters from the input end of the filtration device, and after being filtered through the internal multi-layer filter element, the clean steam is discharged from the output end.

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