Infiltration wastewater reduced pressure distillation recovery system

Abstract

The utility model relates to the technical field of reduced pressure distillation, and discloses an infiltration wastewater reduced pressure distillation recovery system which comprises a distillation retort, a wastewater tank, a heating coil, a concentrated water tank, a hydraulic ejector, a plate heat exchanger for condensation, a plate heat exchanger for cooling, a heat pump system, a clear water tank and a circulating pump, untreated infiltration wastewater is stored in the wastewater tank, the wastewater tank inputs the infiltration wastewater into the distillation retort, the heating coil is arranged in the wastewater tank and used for continuously heating the wastewater in the distillation retort at low temperature, the heating coil is connected with the heat pump system, and the concentrated water tank is communicated with the bottom of the distillation retort through a pipeline. The distillation retort is used for collecting high-concentration distillation waste liquid after distillation treatment, and the upper end of the distillation retort is communicated with a first inlet of the plate heat exchanger for condensation through a pipeline. The device can realize reduced pressure distillation and cooling recovery of the infiltration wastewater.

Description

Technical Field

[0001] This utility model relates to the field of vacuum distillation technology, and in particular to a vacuum distillation recovery system for impregnated wastewater. Background Technology

[0002] Vacuum distillation is an important method for separating and purifying compounds, especially suitable for high-boiling-point substances and compounds that decompose, oxidize, or polymerize before reaching their boiling point during atmospheric distillation. Impregnation is a microporous permeation sealing process where a sealing medium is introduced into micropores through natural permeation, vacuuming, or pressurization to seal the gaps. After impregnation, the aqueous solution and impregnating liquid in the impregnation waste liquid need to be separated, allowing for the recovery and reuse of the concentrated impregnating liquid.

[0003] In the prior art, there are also some vacuum distillation systems, such as the Chinese invention patent with application number CN202210597315.3 entitled "A Low-Temperature Heat Pump Membrane Distillation Wastewater Concentration System". The low-temperature heat pump membrane distillation wastewater concentration system disclosed in the patent utilizes the heat release of liquefaction and heat absorption of vaporization of the refrigerant in the heat pump to realize the heat recycling in the system for the concentration of low-temperature heat pump membrane distillation wastewater. However, it requires the use of membrane distillation components and hydrophobic membrane pores, etc., which results in higher maintenance frequency and cost.

[0004] For example, Chinese invention patent application number CN201911203851.5, entitled "A Low-Temperature Water Distillation System and Method," uses a circulating water pump outside the evaporator to draw water from the liquid phase zone of the evaporator. After absorbing heat through a circulating heater, the water enters the upper part of the evaporator and is sprayed to accelerate water evaporation, thereby improving working efficiency. It also controls the pressure inside the heat absorption tube of the circulating heater, solving the scaling problem inside the circulating heater. However, it uses five condensation and heating related devices: a return cooler, a vacuum condenser, an aftercooler, a circulating heater, and a recooler, making the system relatively complex and costly. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a vacuum distillation and recovery system for infiltration wastewater, which can realize vacuum distillation and cooling recovery of infiltration wastewater.

[0006] This utility model is achieved using the following technical solution: a vacuum distillation recovery system for impregnated wastewater, comprising a distillation tank, a wastewater tank, a heating coil, a concentrate tank, a hydraulic ejector, a condensation plate heat exchanger, a cooling plate heat exchanger, a heat pump system, a clean water tank, and a circulating pump. The wastewater tank is connected to the distillation tank via a pipeline and stores untreated impregnated wastewater. The wastewater tank is used to input impregnated wastewater into the distillation tank. The heating coil is installed inside the wastewater tank for continuous low-temperature heating of the wastewater in the distillation tank. The heating coil is connected to the heat pump system. The concentrate tank is connected to the bottom of the distillation tank through a pipe to collect the high-concentration distillation waste liquid after distillation. The upper end of the distillation tank is connected to the first inlet of the condensation plate heat exchanger through a pipe. The clear water tank is connected to the circulation pump through a pipe. The circulation pump is connected to the second inlet of the condensation plate heat exchanger after passing through a channel of the cooling plate heat exchanger. The outlet of the condensation plate heat exchanger is connected to the hydraulic ejector. The outlet of the hydraulic ejector is connected to the clear water tank through a pipe.

[0007] Furthermore, the heat pump system includes a compressor, a condenser, and an expansion valve. The inlet end of the condenser is connected to the outlet end of the heating coil via a pipe. The outlet end of the condenser is connected to the inlet end of the compressor via another channel of a cooling plate heat exchanger. The outlet end of the compressor is connected to the inlet end of the heating coil via a pipe. The expansion valve is installed on the outlet pipe of the condenser.

[0008] Furthermore, a filter is installed on the outlet pipe of the condenser in front of the expansion valve.

[0009] Furthermore, a wastewater tank valve is installed on the connecting pipe between the wastewater tank and the distillation tank.

[0010] Furthermore, a water tank heating element is installed inside the water tank.

[0011] Furthermore, a water tank thermometer is installed on the water tank.

[0012] Furthermore, the bottom of the water tank is connected to a water outlet pipe, and a water outlet valve is installed on the water outlet pipe.

[0013] Furthermore, the distillation vessel is equipped with a distillation vessel pressure gauge and a distillation vessel thermometer.

[0014] Compared to existing technologies, the advantages of this invention are as follows: This invention provides a vacuum distillation and recovery system for impregnated wastewater. A hydraulic jet pump evacuates the distillation tank, and a heating coil continuously heats the wastewater in the tank at a low temperature. The distilled wastewater boils and vaporizes under the negative pressure generated by the hydraulic jet. The condenser dissipates the heat from the compressor, and the condensed refrigerant is filtered and throttled by an expansion valve before being fed into a cooling plate heat exchanger. The distilled gaseous water is then condensed into liquid by the condensation plate heat exchanger. During this process, the water discharged from the circulating pump is cooled and returned to the clear water tank. The concentration of the wastewater in the distillation tank increases, resulting in a high-concentration impregnated distillation wastewater that is discharged into a concentrated water tank for collection. This achieves vacuum distillation and cooling recovery of impregnated wastewater. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pipeline connection of the impregnation wastewater vacuum distillation recovery system of this utility model.

[0016] In the diagram: Distillation tank-1; Wastewater tank-2; Heating coil-3; Concentrate tank-4; Hydraulic ejector-5; Condensation plate heat exchanger-6; Cooling plate heat exchanger-7; Clean water tank-9; Circulation pump-10; Compressor-11; Condenser-12; Expansion valve-13; Filter-14; Wastewater tank valve-21; Clean water tank heating element-91; Clean water tank thermometer-92; Clean water tank outlet valve-93; Distillation tank pressure gauge-101; Distillation tank thermometer-102. Detailed Implementation

[0017] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0018] The purpose of this invention is to address the shortcomings of existing technologies by providing a vacuum distillation recovery system for infiltration wastewater.

[0019] Example 1

[0020] This embodiment provides a vacuum distillation recovery system for infiltration wastewater, referring to... Figure 1As shown, the system includes a distillation tank 1, a wastewater tank 2, a heating coil 3, a concentrate tank 4, a hydraulic ejector 5, a condensation plate heat exchanger 6, a cooling plate heat exchanger 7, a heat pump system, a clean water tank 9, and a circulation pump 10. The wastewater tank 2 is connected to the distillation tank 1 via a pipe. A wastewater tank valve 21 is installed on the connecting pipe between the wastewater tank 2 and the distillation tank 1. The wastewater tank 2 stores untreated leachate wastewater and supplies leachate wastewater to the distillation tank 1. The wastewater tank valve 21 controls the opening and closing of the pipe between the wastewater tank 2 and the distillation tank 1. The heating coil 3 is located inside the wastewater tank 2 and is used to continuously heat the wastewater in the distillation tank 1 at a low temperature. The heating coil 3 is connected to the heat pump system. The concentrate tank 4 is connected to the bottom of the distillation tank 1 via a pipe and is used to collect the high-concentration distillation waste liquid after distillation. The upper end of the distillation tank 1 is connected to the first inlet of the condensation plate heat exchanger 6 via a pipe. A distillation tank pressure gauge 101 and a distillation tank thermometer 102 are installed on the distillation tank 1 to measure the pressure inside the tank and the temperature of the distilled liquid. The clear water tank 9 is connected to the circulation pump 10 via a pipe. The circulation pump 10 is connected to the second inlet of the condensation plate heat exchanger 6 via a channel of the cooling plate heat exchanger 7. The two outlets of the condensation plate heat exchanger 6 are connected to the hydraulic ejector 5. The outlet of the hydraulic ejector 5 is connected to the clear water tank 9 via a pipe.

[0021] Reference Figure 1 As shown, the heat pump system includes a compressor 11, a condenser 12, and an expansion valve 13. The inlet of the condenser 12 is connected to the outlet of the heating coil 3 via a pipe. The outlet of the condenser 12 is connected to the inlet of the compressor 11 via another channel of the cooling plate heat exchanger 7. A filter 14 is also installed on the outlet pipe of the condenser 12, in front of the expansion valve 13. The outlet of the compressor 11 is connected to the inlet of the heating coil 3 via a pipe, and the expansion valve 13 is installed on the outlet pipe of the condenser 12. A water tank heating tube 91 is installed in the water tank 9 to heat the distilled water in the water tank 9. A water tank thermometer 92 is installed on the water tank 9 to measure the temperature of the distilled water in the water tank 9. A water outlet pipe is connected to the bottom of the water tank 9, and a water tank outlet valve 93 is installed on the water outlet pipe to control the discharge of distilled water from the water tank 9.

[0022] This invention discloses a vacuum distillation recovery system for impregnated wastewater. During operation, the circulating pump 10 starts water circulation, and the hydraulic ejector 5 creates a vacuum in the distillation tank 1. The wastewater tank valve 21 is opened, allowing wastewater from the wastewater tank 2 to be drawn into the distillation tank 1. After a certain amount of wastewater is drawn in, the wastewater tank valve 21 is closed, and vacuuming continues. Simultaneously, the heat pump system is activated. The heat generated at the outlet of the compressor 11 is input to the distilled impregnated wastewater in the distillation tank 1 through the heating coil 3, continuously heating the wastewater in the distillation tank 1 at a low temperature. Under the negative pressure generated by the hydraulic ejector 5, the distilled wastewater boils and vaporizes. A distillation tank pressure gauge 101 and a distillation tank thermometer 102 installed on the distillation tank 1 are used to measure the pressure inside the distillation tank 1 and the temperature of the distilled liquid, maintaining the distillation tank 1 within a suitable pressure and temperature range. The heat of the compressor 11 is consumed by the condenser 12. The condensed refrigerant is filtered by the filter 14 and throttled by the expansion valve 13 before being fed into the cooling plate heat exchanger 7. The distilled gaseous water is condensed into liquid by the condensation plate heat exchanger 6.

[0023] In this process, the water discharged by the circulating pump 10 is first cooled by the plate heat exchanger 7 and then returned to the clear water tank 9. The wastewater in the distillation tank 1 is distilled under reduced pressure and becomes gaseous water. Through the action of the hydraulic jet 5, it passes through the condensation plate heat exchanger 6. After heat exchange, it enters the clear water tank 9 and is collected as clean liquid water. After a period of time, the amount of wastewater in the distillation tank 1 decreases and the concentration increases, resulting in high-concentration impregnation distillation waste liquid. Then, the distillation tank valve on the bottom pipe of the distillation tank 1 is opened to discharge the high-concentration impregnation distillation waste liquid into the concentrate tank 4 for collection, thereby realizing the reduced pressure distillation and cooling recovery of the impregnation wastewater.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A vacuum distillation recovery system for infiltration wastewater, characterized in that: The system includes a distillation tank (1), a wastewater tank (2), a heating coil (3), a concentrate tank (4), a hydraulic jet (5), a condensation plate heat exchanger (6), a cooling plate heat exchanger (7), a heat pump system, a clean water tank (9), and a circulation pump (10). The wastewater tank (2) is connected to the distillation tank (1) via a pipe. The wastewater tank (2) stores untreated impregnation wastewater and is used to input impregnation wastewater into the distillation tank (1). The heating coil (3) is installed inside the wastewater tank (2) and is used to continuously heat the wastewater in the distillation tank (1) at a low temperature. The heating coil (3) is connected to the heat pump system. Next, the concentrated water tank (4) is connected to the bottom of the distillation tank (1) through a pipe to collect the high-concentration distillation waste liquid after distillation. The upper end of the distillation tank (1) is connected to the first inlet of the condensation plate heat exchanger (6) through a pipe. The clear water tank (9) is connected to the circulation pump (10) through a pipe. The circulation pump (10) is connected to the second inlet of the condensation plate heat exchanger (6) after passing through a channel of the cooling plate heat exchanger (7). The outlet of the condensation plate heat exchanger (6) is connected to the water jet (5). The outlet of the water jet (5) is connected to the clear water tank (9) through a pipe.

2. The impregnation wastewater vacuum distillation recovery system according to claim 1, characterized in that: The heat pump system includes a compressor (11), a condenser (12), and an expansion valve (13). The inlet end of the condenser (12) is connected to the outlet end of the heating coil (3) through a pipe. The outlet end of the condenser (12) is connected to the inlet end of the compressor (11) through another channel of the cooling plate heat exchanger (7). The outlet end of the compressor (11) is connected to the inlet end of the heating coil (3) through a pipe. The expansion valve (13) is installed on the outlet pipe of the condenser (12).

3. The impregnation wastewater vacuum distillation recovery system according to claim 2, characterized in that: A filter (14) is also installed on the outlet pipe of the condenser (12) in front of the expansion valve (13).

4. The impregnation wastewater vacuum distillation recovery system according to claim 1, characterized in that: A wastewater tank valve (21) is installed on the connecting pipe between the wastewater tank (2) and the distillation tank (1).

5. The impregnation wastewater vacuum distillation recovery system according to claim 1, characterized in that: The water tank (9) is equipped with a water tank heating tube (91).

6. The impregnation wastewater vacuum distillation recovery system according to claim 1, characterized in that: The water tank (9) is equipped with a water tank thermometer (92).

7. The impregnation wastewater vacuum distillation recovery system according to claim 1, characterized in that: The bottom end of the clean water tank (9) is connected to a water outlet pipe, and a clean water tank outlet valve (93) is installed on the water outlet pipe.

8. The impregnation wastewater vacuum distillation recovery system according to claim 1, characterized in that: The distillation tank (1) is equipped with a distillation tank pressure gauge (101) and a distillation tank thermometer (102).

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