High-salinity wastewater treatment device

Abstract

The utility model relates to the field of high-salinity wastewater treatment, in particular to a high-salinity wastewater treatment device. A high-salinity wastewater treatment device comprises: an evaporator comprising an evaporator pipeline and an evaporator container; the crystallizer is arranged on one side of the evaporator and communicated with the other end of the evaporator pipeline, and a heating device is arranged in the crystallizer so that materials can be boiled and evaporated; one end of the steam compressor is communicated with the upper end of the crystallizer so as to collect the secondary steam after boiling evaporation, and the other end of the steam compressor is communicated with an evaporator container of the evaporator, so that the compressed secondary steam is conveyed into the evaporator container from the other end of the steam compressor. The steam formed by secondary evaporation in an overheating state is used as a heat source to heat materials, so that efficient recycling of low-grade waste heat in the evaporation process is effectively achieved, and the energy utilization efficiency in the evaporation process is improved.

Description

Technical Field

[0001] The utility model relates to the field of high-salt wastewater treatment, in particular to a high-salt wastewater treatment device. Background Art

[0002] A large amount of wastewater is generated during industrial production, a considerable portion of which has a salt content of more than 1%, which is typical high-salinity wastewater. This type of wastewater usually also contains a large amount of organic matter. Due to its complex composition and large amount of water, it leads to high cost and difficulty in treatment. Its treatment problem has become a bottleneck restricting the sustainable development of related industries.

[0003] At present, the treatment of various types of high-salt wastewater usually adopts the main process route of "pretreatment + evaporation and crystallization"; in the pretreatment stage, different pretreatment technologies are selected according to the differences in the organic components contained, such as extraction, adsorption, advanced oxidation, etc., to achieve the purpose of organic resource recovery or harmless removal; further, the high-salt wastewater after pretreatment is evaporated and crystallized to achieve resource recovery of crystallized salt and reuse of evaporated condensate.

[0004] In view of the above-mentioned prior art, the inventors found that the existing multi-effect evaporation is a commonly used process in the evaporation and crystallization process of high-salt wastewater. However, since the secondary steam generated by the multi-effect evaporation needs to be condensed, a large amount of low-grade thermal energy is wasted. At the same time, circulating cooling water is also required, resulting in low thermal energy utilization and high energy consumption in the evaporation process. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a high-salt wastewater treatment device.

[0006] The high-salt wastewater treatment device provided in this application adopts the following technical solution:

[0007] A high-salt wastewater treatment device, comprising:

[0008] An evaporator, the evaporator comprising an evaporator pipeline and an evaporator container, at least a portion of the evaporator pipeline is disposed in the evaporator container so that the high-salinity wastewater to be treated is evaporated and boiled once and then transported from one end of the evaporator pipeline to the other end;

[0009] A crystallizer, the crystallizer is arranged on one side of the evaporator and is connected to the other end of the evaporator pipeline, and a heating device is provided in the crystallizer to make the material boil and evaporate;

[0010] A steam compressor, one end of which is connected to the upper end of the crystallizer to collect secondary steam after boiling and evaporation, and the other end of which is connected to the evaporator container of the evaporator, so that the compressed secondary steam is transported to the evaporator container from the other end of the steam compressor.

[0011] Through the above technical solution, the present application preheats the material for the next evaporation and then performs secondary evaporation in the evaporator. Since the steam formed by the secondary evaporation is in an overheated state, it can return to the evaporator shell as a heat source to heat the material after the overheating is eliminated, thereby effectively realizing the efficient recovery and reuse of low-grade waste heat in the evaporation process, thereby reducing the demand for external energy. This technology helps to improve the energy utilization efficiency of the evaporation process and reduce CO 2 Emissions are an important technical guarantee for achieving process emission reduction, carbon reduction, energy conservation and environmental protection.

[0012] Furthermore, the evaporator further comprises a condensation waste heat recovery device, and the condensation waste heat recovery device comprises:

[0013] A high-temperature condensate tank, the high-temperature condensate tank is connected to the evaporator pipeline in the evaporator to collect the high-temperature condensate after releasing latent heat;

[0014] A preheater, the preheater is connected to the high-temperature condensate tank to recover the heat energy of the high-temperature condensate as a preheating heat source;

[0015] A condensate pump is provided between the high-temperature condensate tank and the preheater to transport the high-temperature condensate.

[0016] Through the above technical scheme, the present application collects the high-temperature condensate after releasing the latent heat through the high-temperature condensate tank and reuses it as a heat source in the preheater, thereby realizing the efficient recovery and reuse of the subsequent waste heat of the high-temperature condensate, further reducing the demand for external energy and improving the reuse rate of energy.

[0017] Furthermore, the condensation waste heat recovery device also includes:

[0018] A low-temperature condensate tank is arranged on a side of the preheater away from the high-temperature condensate tank to recover the low-temperature condensate cooled after releasing heat.

[0019] Furthermore, the high-salt wastewater treatment device also includes:

[0020] A raw material tank, which is arranged at one side of the evaporator and is provided with a receiving cavity for storing high-salinity wastewater;

[0021] A feed pump is provided between the preheater and the raw material tank so that high-salt wastewater is fed from the raw material tank toward one side of the preheater.

[0022] Furthermore, the crystallizer further comprises:

[0023] A filtering device, which is disposed at the lower end of the crystallizer and is provided with a belt filter to recover the precipitated crystal slurry and separate the crystallized salt and the clear liquid;

[0024] A circulation device is provided with a circulation pump, one end of which is connected to one end of the filtering device, and the other end of which is connected to the crystallizer, so as to transport the separated clear liquid to the crystallizer.

[0025] Through the above technical solution, the present application optimizes the structure of the crystallizer, and through the setting of the filtering device and the circulating device, the clear liquid in the crystal slurry is reused, thereby improving the recycling efficiency of the material.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. This application preheats the material for the next evaporation and then performs a secondary evaporation process in the evaporator. Since the steam formed by the secondary evaporation is in an overheated state, it can return to the evaporator shell as a heat source to heat the material after the overheating is eliminated, thereby effectively realizing the efficient recovery and reuse of low-grade waste heat in the evaporation process, thereby reducing the demand for external energy. This technology helps to improve the energy utilization efficiency of the evaporation process and reduce CO2 emissions. It is an important technical guarantee for achieving process emission reduction and carbon reduction, energy conservation and environmental protection.

[0028] 2. This application preheats the material for the next evaporation and then performs a secondary evaporation process in the evaporator. Since the steam formed by the secondary evaporation is in an overheated state, it can return to the evaporator shell as a heat source to heat the material after the overheating is eliminated, thereby effectively realizing the efficient recovery and reuse of low-grade waste heat in the evaporation process, thereby reducing the demand for external energy. This technology helps to improve the energy utilization efficiency of the evaporation process and reduce CO 2 Emissions are an important technical guarantee for achieving process emission reduction, carbon reduction, energy conservation and environmental protection.

[0029] 3. The present application optimizes the structure of the crystallizer and reuses the clear liquid in the crystal slurry by setting up a filtering device and a circulating device, thereby improving the recycling efficiency of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a high-salt wastewater treatment device according to an embodiment of the present application.

[0031] Explanation of the reference numerals: 1. Evaporator; 11. Evaporator piping; 12. Evaporator container; 13. Condensation waste heat recovery device; 131. High-temperature condensate tank; 132. Preheater; 133. Low-temperature condensate tank; 2. Crystallizer; 21. Filter device; 22. Circulation device; 3. Steam compressor; 4. Raw material tank; 5. Feed pump. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1 This application is described in further detail.

[0033] like Figure 1 A high-salt wastewater treatment device includes a raw material tank, a holding chamber for holding the high-salt wastewater to be treated is provided in the raw material tank, a feed pump is provided on one side of the raw material tank for transporting the high-salt wastewater to be treated to a preheater connected to the feed pump, a preheating heat source for heating the high-salt wastewater is provided in the preheater, an evaporator is provided on the side of the preheater away from the feed pump, the evaporator is provided with an evaporator pipeline and an evaporator container, the evaporator pipeline and the evaporator container respectively form an evaporator tube side and an evaporator shell side of the evaporator, a crystallizer is also provided on the other side of the evaporator, a heating device is provided in the crystallizer, the high-salt wastewater is heated and treated through the evaporator tube side to form primary steam, the primary steam is boiled and evaporated in the crystallizer to form secondary steam, a steam compressor is connected to the upper end of the crystallizer, the secondary steam enters the steam compressor after separation by the enterprise, and the precipitated crystal slurry settles to the bottom of the crystallizer.

[0034] At the other end of the steam compressor, there is also an evaporator container connected. After the secondary steam compression, it is in an overheated state. After eliminating the superheat, it becomes saturated steam and returns to the evaporator shell as a heat source to heat the material. At the lower end of the evaporator, there is a condensation waste heat recovery device, which includes a high-temperature condensate tank, a preheater and a low-temperature condensate tank. The steam returning to the evaporator shell as a heat source first condenses into water after releasing latent heat and enters the high-temperature condensate tank. The high-temperature condensate is used as a heat source to preheat the raw material and first enters the preheater as a preheating heat source. After condensation treatment, it is collected and discharged. At the lower end of the crystallizer, there are a filtering device and a circulation device connected. The crystal slurry entering the mother liquid tank is centrifuged through the belt filter in the filtering device. After dehydration, the crystal salt is obtained. The remaining clear liquid enters the clear liquid tank in the circulation device, and then is pumped back to the system through a centrifugal pump to continue to participate in the circulation. Thereby, the clear liquid in the crystal slurry is reused, and the recycling efficiency of the material is improved.

[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-salt wastewater treatment device, characterized in that: include: An evaporator, the evaporator comprising an evaporator pipeline and an evaporator container, at least a portion of the evaporator pipeline is disposed in the evaporator container so that the high-salinity wastewater to be treated is evaporated and boiled once and then transported from one end of the evaporator pipeline to the other end; A crystallizer, which is arranged on one side of the evaporator and is connected to the other end of the evaporator pipeline, and a heating device is provided in the crystallizer to boil and evaporate the material; A steam compressor, one end of which is connected to the upper end of the crystallizer to collect secondary steam after boiling and evaporation, and the other end of which is connected to the evaporator container of the evaporator, so that the compressed secondary steam is transported to the evaporator container from the other end of the steam compressor.

2. A high-salt wastewater treatment device according to claim 1, characterized in that: The evaporator further includes a condensation waste heat recovery device, which includes: A high-temperature condensate tank, the high-temperature condensate tank is connected to the evaporator pipeline in the evaporator to collect the high-temperature condensate after releasing latent heat; A preheater, the preheater is connected to the high-temperature condensate tank to recover the heat energy of the high-temperature condensate as a preheating heat source; A condensate pump is provided between the high-temperature condensate tank and the preheater to transport the high-temperature condensate.

3. A high-salt wastewater treatment device according to claim 2, characterized in that: The condensation waste heat recovery device also includes: A low-temperature condensate tank is arranged on a side of the preheater away from the high-temperature condensate tank to recover the low-temperature condensate cooled after releasing heat.

4. A high-salt wastewater treatment device according to claim 2, characterized in that: The high-salt wastewater treatment device also includes: A raw material tank, which is arranged at one side of the evaporator and is provided with a receiving cavity for storing high-salinity wastewater; A feed pump is provided between the preheater and the raw material tank so that high-salt wastewater is fed from the raw material tank toward one side of the preheater.

5. A high-salt wastewater treatment device according to claim 1, characterized in that: The crystallizer also includes: A filtering device, which is disposed at the lower end of the crystallizer and is provided with a belt filter to recover the precipitated crystal slurry and separate the crystallized salt and the clear liquid; A circulation device is provided with a circulation pump, one end of which is connected to one end of the filtering device, and the other end of which is connected to the crystallizer, so as to transport the separated clear liquid to the crystallizer.

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