A vacuum low-temperature evaporation wastewater treatment system

Abstract

This utility model relates to a vacuum low-temperature evaporation wastewater treatment system, including a chassis and a distillation kettle and a vacuum cooling device installed inside the chassis; wherein, the distillation kettle is provided with a wastewater inlet, a steam outlet and a concentrate outlet, the wastewater inlet is equipped with a liquid inlet valve and the concentrate outlet is equipped with a drain valve; a float level gauge is installed on the distillation kettle, the float level gauge is used to control the opening and closing of the liquid inlet valve; the vacuum cooling device is in fluid communication with the steam outlet, and is used to evacuate the distillation kettle and cool the steam into water; wherein, the vacuum low-temperature evaporation wastewater treatment system further includes a COD reduction and deodorization device, the COD reduction and deodorization device is used to treat the distilled water to reduce COD and deodorize it.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and specifically to a vacuum low-temperature evaporation wastewater treatment system. Background Technology

[0002] Low-temperature evaporation wastewater treatment is a highly efficient and environmentally friendly wastewater treatment technology. It utilizes the principle of evaporation under low-temperature conditions to evaporate and separate water from wastewater, thereby achieving wastewater concentration and purification. This technology is not only suitable for treating various types of wastewater but also reduces energy consumption and improves treatment efficiency during the process.

[0003] The distilled water produced by existing vacuum low-temperature evaporation wastewater treatment systems usually contains relatively high COD and has an odor, requiring further COD reduction and deodorization treatment. Summary of the Invention

[0004] The purpose of this invention is to provide a vacuum low-temperature evaporation wastewater treatment system to solve the above-mentioned problems.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A vacuum low-temperature evaporation wastewater treatment system includes a chassis and a distillation kettle and a vacuum cooling device installed within the chassis. The distillation kettle has a wastewater inlet, a steam outlet, and a concentrate outlet. The wastewater inlet is equipped with a liquid inlet valve, and the concentrate outlet is equipped with a drain valve. An immersion heat exchanger is installed inside the distillation kettle, with its inlet end in fluid communication with a compressor and its outlet end in fluid communication with a condenser. A float level gauge is installed on the distillation kettle to control the opening and closing of the liquid inlet valve. The vacuum cooling device is in fluid communication with the steam outlet and is used to evacuate the distillation kettle and cool the steam into distilled water. The vacuum low-temperature evaporation wastewater treatment system also includes a COD reduction and deodorization device for reducing the COD and deodorizing the distilled water.

[0007] Furthermore, the vacuum cooling device includes a cooling tank and a vacuum pump. A shell-and-tube heat exchanger is installed in the cooling tank. One end of the tube side of the shell-and-tube heat exchanger is connected to the steam outlet through a steam pipe, and the other end is in fluid communication with the vacuum pump. One end of the shell side of the shell-and-tube heat exchanger is in fluid communication with the condenser, and the other end is in fluid communication with the compressor.

[0008] Furthermore, the COD reduction and deodorization device includes an ozone generator, and an ozone inlet is provided on the side wall of the cooling tank. The ozone inlet is connected to the ozone generator and is used to introduce ozone into the cooling tank to treat the distilled water for COD reduction and deodorization.

[0009] Furthermore, the cooling tank is provided with a vacuum pump inlet at the bottom and a vacuum pump return port on the side.

[0010] Furthermore, the vacuum low-temperature evaporation wastewater treatment system also includes a level gauge cleaning device, which is used to spray and clean the float level gauge.

[0011] Furthermore, the level gauge cleaning device includes a pressure pump, a solenoid valve, and a spray head. The inlet end of the pressure pump is in fluid communication with the vacuum cooling device, and the outlet end is connected to the spray pipe. The solenoid valve is installed on the spray pipe, and the spray head is installed at the end of the spray pipe and aligned with the float of the float level gauge.

[0012] Furthermore, the float level gauge is installed in a vertical pipe on the side of the distillation vessel, and the vertical pipe is connected to the distillation vessel so that the liquid levels in both are level. The spray head is installed on the vertical pipe at a position corresponding to the float of the float level gauge.

[0013] Furthermore, the immersion heat exchanger is in the form of an annular coil.

[0014] Furthermore, a drain pump is installed after the drain valve to discharge the concentrate in the distillation vessel. The drain pump is a diaphragm pump.

[0015] Furthermore, a control panel is installed on the chassis, and the control panel is equipped with a touch screen with a human-computer interaction interface.

[0016] The present invention adopts the above-mentioned technical solution and has the following beneficial effects: by setting up a COD reduction and deodorization device, the COD in distilled water can be reduced and odors removed, resulting in distilled water that meets the standards, and no further treatment is required. Attached Figure Description

[0017] Figure 1 This is a perspective view of the vacuum low-temperature evaporation wastewater treatment system according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 The side view of the vacuum low-temperature evaporation wastewater treatment system shown is shown.

[0019] Figure 3 yes Figure 1 A three-dimensional view of the distillation vessel of the vacuum low-temperature evaporation wastewater treatment system shown;

[0020] Figure 4 yes Figure 2 A cross-sectional view of the float level gauge and level gauge cleaning device of the vacuum low-temperature evaporation wastewater treatment system shown.

[0021] Figure 5 yes Figure 3 A three-dimensional view of the immersion heat exchanger inside the distillation vessel of the vacuum low-temperature evaporation wastewater treatment system shown.

[0022] Figure 6 yes Figure 1 A three-dimensional view of the shell-and-tube heat exchanger in the vacuum low-temperature evaporation wastewater treatment system shown.

[0023] Figure 7 yes Figure 6 A cross-sectional view of a shell-and-tube heat exchanger shown.

[0024] Figure 8 This is a process flow diagram of the vacuum low-temperature evaporation wastewater treatment system according to an embodiment of this utility model. Detailed Implementation

[0025] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are only for illustrating the essential spirit of the technical solution of the present invention.

[0026] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0027] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0028] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0029] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0030] In the following description, in order to clearly demonstrate the structure and working method of this utility model, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0031] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] like Figure 1-8 As shown, a vacuum low-temperature evaporation wastewater treatment system may include a chassis 1 and a distillation kettle 2 and a vacuum cooling device installed inside the chassis 1. The chassis 1 is assembled from a frame and door panels. A control panel 11 is provided on the side of the chassis 1, and the control panel 11 is electrically connected to an explosion-proof control box located inside the chassis 1. The control panel is equipped with a touch screen, status indicator lights, and power buttons. The touch screen has a human-machine interface, through which operators can monitor the operation of the vacuum low-temperature evaporation wastewater treatment system. In addition, the chassis is also equipped with an audible and visual alarm device 12, which displays a green light during normal operation and flashes a red light and sounds an alarm when a fault occurs. The explosion-proof control box is installed inside the chassis. The explosion-proof control box contains a power supply, a PLC controller, terminal blocks, and I / O cards, and its configuration can be designed according to needs.

[0034] The distillation vessel 2 is equipped with a wastewater inlet, a steam outlet 22, and a concentrate outlet 23. The wastewater inlet is fitted with a liquid inlet valve 21 to control the inflow of wastewater into the distillation vessel 2. The steam outlet 22 is located at the top of the distillation vessel 2, while the concentrate outlet 23 is located at the bottom. The concentrate outlet 23 is fitted with a drain valve 231 to control the discharge of the concentrate after wastewater distillation. A drain pump 232 is installed after the drain valve 231 to discharge the concentrate from the distillation vessel 2. Preferably, the drain pump 232 is a diaphragm pump. An immersion heat exchanger 3 is installed inside the distillation vessel 2. The inlet of the immersion heat exchanger 3 is in fluid communication with the compressor 4, and the outlet is in fluid communication with the condenser 5. The high-temperature, high-pressure refrigerant generated by the heat pump circuit of the compressor 4 flows into the immersion heat exchanger 3, causing the liquid in the distillation vessel 2 to boil. The steam rises through the demister and enters the vacuum cooling device through the steam outlet 22. A float level gauge 24 is installed on the distillation vessel 2, which controls the opening and closing of the inlet valve. Specifically, when the float level gauge 24 detects that the liquid level in the distillation vessel 2 has reached the high limit, it automatically closes the inlet valve; when the liquid level drops to the low limit, it automatically opens the inlet valve. A vacuum cooling device is fluidly connected to the steam outlet 22 and is used to evacuate the distillation vessel 2 and cool the steam into water. The specific structure of the vacuum cooling device is described below.

[0035] like Figure 3 and 4 As shown, the vacuum low-temperature evaporation wastewater treatment system may also include a level gauge cleaning device, which is used to spray clean the float level gauge 24. Specifically, the level cleaning device includes a pressurizing pump (not shown), a solenoid valve 26, and a spray head 27. The inlet end of the pressurizing pump is in fluid communication with the vacuum cooling device, and the outlet end is connected to a spray pipe. The solenoid valve 26 is installed on the spray pipe, and the spray head 27 is installed at the end of the spray pipe and aligned with the float 241 of the float level gauge 24. In other embodiments, the pressurizing pump may be omitted, and the spray pipe may be directly connected to the circulating water pipeline of the vacuum cooling device (e.g., Figure 8 (As shown). The solenoid valve 26 is controlled by a PLC program to flush the float level gauge 24 at regular intervals (e.g., every 1-2 hours) to ensure the float can operate normally. By setting up a level cleaning device, the level gauge can be flushed at regular intervals, reducing the frequency of level gauge failures and improving equipment operating efficiency.

[0036] In the illustrated embodiment, the float level gauge 24 is installed in a vertical pipe 25 on the side of the distillation vessel 2. The vertical pipe 25 is connected to the distillation vessel 2 so that the liquid levels in both are level. A spray head 27 is installed on the vertical pipe 25 at a position corresponding to the float 241 of the float level gauge 24. In a specific embodiment, the float level gauge 24 has two floats, upper and lower, and correspondingly, two spray heads 27 are provided. It should be understood that the float level gauge 24 can also be directly installed inside the distillation vessel 2, in which case the spray heads 27 are also installed inside the distillation vessel 2. The float level gauge 24 is a commercially available side-mounted stainless steel float switch.

[0037] like Figure 3 and 4 The distillation vessel 2 is also equipped with a defoamer inlet 28, which has a defoamer valve to control the flow of defoamer into the distillation vessel 2. The opening and closing of the defoamer valve is also controlled by a PLC program.

[0038] In addition, the distillation vessel 2 is equipped with a vent valve, which is opened after the distillation process is completed to release the vacuum from the distillation vessel 2.

[0039] like Figure 5 As shown, the immersion heat exchanger 3 is an annular coil shape, specifically including an inlet manifold 31, multiple (three shown) spiral tubes 32, and an outlet manifold 33. The multiple spiral tubes 32 are nested together, and their two ends are respectively connected to the inlet manifold 31 and the outlet manifold 33. The immersion heat exchanger 3 can be made of copper tubes, which has the advantage of high heat exchange efficiency.

[0040] like Figure 6-8 As shown, the vacuum cooling device includes a cooling tank 6 and a vacuum pump 62. The cooling tank 6 has a steam inlet 60, which is connected to the steam outlet 22 of the distillation vessel 2. A shell-and-tube heat exchanger 61 is installed inside the cooling tank 6. One end of the tube side of the shell-and-tube heat exchanger 61 is connected to the steam outlet 22 via a steam pipe, and the other end is in fluid communication with the vacuum pump 62. One end of the shell side (lower inlet) of the shell-and-tube heat exchanger 61 is in fluid communication with the condenser 5, and the other end (upper outlet) is in fluid communication with the compressor 4. That is, the refrigerant cooled by the condenser 5 cools the water vapor into distilled water. The vacuum pump 62 evacuates the distillation vessel 2 through the steam pipe, allowing the wastewater to be treated to be drawn into the distillation vessel 2. This also lowers the boiling point of the water, enabling the system to operate at low temperatures (e.g., 60–70 degrees Celsius), saving energy and improving safety.

[0041] The cooling tank 6 is provided with a vacuum pump inlet 63 at the bottom and a vacuum extraction port 64 and a vacuum pump return port 65 on the side. The vacuum pump 62 is in fluid communication with the vacuum pump inlet 63, the vacuum extraction port 64 and the vacuum pump return port 65.

[0042] The cooling tank 6 is also provided with a water outlet 66 on its side, and the water outlet 66 is provided with a quick connector to facilitate the connection of the water outlet pipe.

[0043] In addition, the cooling tank 6 is equipped with an ozone inlet 67, which is connected to an ozone generator (not shown) to introduce ozone into the cooling tank 6. This ozone then deodorizes the condensed distilled water to reduce COD and obtain distilled water that meets standards. The ozone generator is commercially available and will not be described in detail here. The ozone inlet 67 can also serve as an exhaust port to remove non-condensable gases from the steam.

[0044] Furthermore, an expansion valve is provided between the condenser 5 and the shell-and-tube heat exchanger 61. That is, after the refrigerant passes through the expansion valve, it exchanges heat with the water vapor passing through the tubes of the shell-and-tube heat exchanger 61, thereby cooling the water vapor into distilled water. The condenser 5 is air-cooled, meaning that the condenser 5 is equipped with a fan 51, which is mounted on the top of the casing 2.

[0045] The following reference Figure 6 The working process of this utility model is described as follows: After turning on the power switch and setting the corresponding process parameters on the operation interface, click the "One-Click Processing" button. The PLC program will run automatically according to the preset steps. When the vacuum degree in the distillation kettle 2 reaches the preset value, the liquid inlet valve opens, and wastewater is drawn into the distillation kettle 2. When the preset liquid level is reached, the liquid inlet valve closes, and the high-temperature and high-pressure refrigerant generated by the heat pump circuit flows into the immersion heat exchanger 3, causing the liquid in the distillation kettle 2 to boil. The steam rises through the demister and enters the vacuum cooling device through the steam outlet 22, where it is condensed into distilled water through the shell-and-tube heat exchanger 61. The ozone generated by the ozone generator deodorizes the distilled water by reducing COD. After the wastewater treatment is completed, the remaining concentrate in the distillation kettle 2 is discharged through the drain valve 231 and the drain pump 232. The entire process is automatically run by the PLC program, resulting in high working efficiency.

[0046] The preferred embodiments of this utility model have been described in detail above. However, it should be understood that after reading the above teachings, those skilled in the art can make various alterations or modifications to this utility model. These equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A vacuum low-temperature evaporation wastewater treatment system, characterized in that, The system includes a chassis and a distillation kettle and a vacuum cooling device installed within the chassis. The distillation kettle has a wastewater inlet, a steam outlet, and a concentrate outlet. The wastewater inlet is equipped with a liquid inlet valve, and the concentrate outlet is equipped with a drain valve. An immersion heat exchanger is installed inside the distillation kettle. The inlet end of the immersion heat exchanger is in fluid communication with the compressor, and the outlet end is in fluid communication with the condenser. A float level gauge is installed on the distillation kettle to control the opening and closing of the liquid inlet valve. The vacuum cooling device is in fluid communication with the steam outlet and is used to evacuate the distillation kettle and cool the steam into distilled water. The vacuum low-temperature evaporation wastewater treatment system also includes a COD reduction and deodorization device for treating the distilled water to reduce COD and deodorize it.

2. The vacuum low-temperature evaporation wastewater treatment system as described in claim 1, characterized in that, The vacuum cooling device includes a cooling tank and a vacuum pump. A shell-and-tube heat exchanger is installed in the cooling tank. One end of the tube side of the shell-and-tube heat exchanger is connected to the steam outlet through a steam pipe, and the other end is in fluid communication with the vacuum pump. One end of the shell side of the shell-and-tube heat exchanger is in fluid communication with the condenser, and the other end is in fluid communication with the compressor.

3. The vacuum low-temperature evaporation wastewater treatment system as described in claim 2, characterized in that, The COD reduction and deodorization device includes an ozone generator. An ozone inlet is provided on the side wall of the cooling tank. The ozone inlet is connected to the ozone generator and is used to introduce ozone into the cooling tank to reduce COD and deodorize the distilled water through ozone.

4. The vacuum low-temperature evaporation wastewater treatment system as described in claim 1, characterized in that, The vacuum low-temperature evaporation wastewater treatment system also includes a level gauge cleaning device, which is used to spray and clean the float level gauge.

5. The vacuum low-temperature evaporation wastewater treatment system as described in claim 4, characterized in that, The liquid level gauge cleaning device includes a pressure pump, a solenoid valve, and a spray head. The inlet end of the pressure pump is in fluid communication with the vacuum cooling device, and the outlet end is connected to the spray pipe. The solenoid valve is installed on the spray pipe, and the spray head is installed at the end of the spray pipe and aligned with the float of the float level gauge.

6. The vacuum low-temperature evaporation wastewater treatment system as described in claim 5, characterized in that, The float level gauge is installed in a vertical pipe on the side of the distillation vessel, and the vertical pipe is connected to the distillation vessel so that the liquid levels in both are level. The spray head is installed on the vertical pipe at a position corresponding to the float of the float level gauge.

7. The vacuum low-temperature evaporation wastewater treatment system as described in claim 2, characterized in that, The cooling tank is equipped with a vacuum pump inlet at the bottom and a vacuum pump return outlet on the side.

8. The vacuum low-temperature evaporation wastewater treatment system as described in claim 1, characterized in that, The immersion heat exchanger is in the form of annular coils.

9. The vacuum low-temperature evaporation wastewater treatment system as described in claim 1, characterized in that, A drain pump is installed after the drain valve to drain the concentrate in the distillation vessel. The drain pump is a diaphragm pump.

10. The vacuum low-temperature evaporation wastewater treatment system as described in claim 1, characterized in that, The chassis is equipped with a control panel, which has a touch screen and a human-computer interaction interface.

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