An explosion-proof low-temperature evaporator

Abstract

This utility model discloses an explosion-proof low-temperature evaporator, comprising: a frame and an evaporator tank, a condenser, an air-cooled condenser, a heat pump, and a PLC controller mounted on the frame, all installed inside the frame. The evaporator tank is equipped with a heat exchange device to heat and evaporate the waste liquid, and the condenser is connected to the evaporator tank to condense the steam. Simultaneously, the air-cooled condenser cools the high-temperature, high-pressure refrigerant discharged from the heat exchange device and delivers the refrigerant to the condenser. The heat pump then receives the refrigerant flowing from the condenser, heats and pressurizes it, and then delivers it to the heat exchange device. A pressure sensor is installed in the pipeline, and the PLC controller is connected to the pressure sensor and the heat pump, controlling the start and stop of the heat pump based on the pressure data. This utility model can reduce the water content of residual concentrated waste liquid and reduce the safety hazard of explosions caused by high pressure in the evaporator.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to an explosion-proof low-temperature evaporator. Background Technology

[0002] With the increasing costs of industrial wastewater treatment and wastewater outsourcing, water resources and water environment issues have become bottlenecks restricting industrial development. The question of how to achieve zero wastewater discharge is being increasingly raised in enterprises. Currently, evaporation is the main method for waste liquid treatment and recycling. This method and process are widely used in modern industrial production, with the primary goal of removing water from waste liquid to produce distilled water and increasing the concentration of the waste liquid to meet subsequent treatment requirements. However, evaporation processes generally have high energy consumption. Therefore, using MVR evaporators to treat wastewater is a common approach at present. This method allows for the recovery and reuse of the steam generated during evaporation, has a relatively simple structure, and consumes less energy. However, in this process, whether the raw liquid steam generated during evaporation is used directly or purified through a gas-liquid separation device, the residual concentrated waste liquid has a high water content. This concentrated waste liquid still needs to be outsourced for treatment, resulting in high production costs. Utility Model Content

[0003] The purpose of this invention is to provide an explosion-proof low-temperature evaporator to reduce the water content of residual concentrated waste liquid and simultaneously reduce the safety hazard of explosion caused by high pressure in the evaporator. To achieve the above objective, this invention adopts the following technical solution:

[0004] This utility model discloses an explosion-proof low-temperature evaporator, comprising: a frame and an evaporator tank, a condenser, an air-cooled condenser, a heat pump, and a PLC controller installed inside the frame.

[0005] The evaporator is equipped with a heat exchange device to heat and evaporate the waste liquid, and the evaporator is connected to the condenser, which condenses the steam generated by the evaporator.

[0006] The air-cooled condenser is connected to the heat exchange device inside the evaporator to cool down the high-temperature and high-pressure refrigerant discharged by the heat exchange device, and then transport the cooled refrigerant to the condenser.

[0007] The heat pump is connected to the condenser to receive the refrigerant flowing out of the condenser, heat and pressurize it, and deliver the high-temperature and high-pressure refrigerant to the heat exchange device.

[0008] A pressure sensor is installed in the pipeline between the heat pump and the heat exchange device and / or in the pipeline between the heat pump and the condenser. The pressure sensor is connected to the PLC controller to transmit the pressure data in the pipeline. The PLC controller is also connected to the heat pump to control the start and stop of the heat pump.

[0009] The evaporator has a waste liquid inlet on its side wall and a steam outlet on its top. The condenser has a steam inlet and a condensate outlet, with the steam inlet connected to the steam outlet of the evaporator via a pipe.

[0010] Furthermore, the explosion-proof low-temperature evaporator also includes: a water storage tank, the condenser is disposed inside the water storage tank, a condensate inlet is provided at the bottom of the water storage tank, the condensate inlet is connected to the condensate outlet of the condenser through a pipe, and a vacuum pump is provided in the passage between the condensate outlet and the condensate inlet to pump condensate from the condensate outlet to the condensate inlet.

[0011] Preferably, the side wall of the water storage tank is provided with a spare condensate outlet, and the spare condensate outlet is connected to the passage between the condensate outlet and the condensate inlet, and a reserved drain outlet is provided in the passage, which is led to the outside of the frame through a pipe.

[0012] Preferably, the connecting pipe between the condensate outlet and the condensate inlet is connected to the vacuum pump via an ejector to form a circulation path.

[0013] Furthermore, the condenser is provided with several through pipes, and the steam inlet is provided with several openings corresponding to the through pipes, so that steam can be dispersed into the condenser for full condensation.

[0014] The passage pipe is provided with several arc-shaped baffles on its outside. The baffles are installed alternately on the outside of the passage pipe so that the refrigerant can fully contact the passage pipe and fully condense the steam.

[0015] Furthermore, the heat exchange device is provided with multiple refrigerant pipes, which are stacked longitudinally, with each layer of refrigerant pipes arranged in a vortex configuration; and they are collected through a refrigerant inlet manifold and a refrigerant outlet manifold. The end of the refrigerant inlet manifold is connected to the heat pump through a pipe, and the end of the refrigerant outlet manifold is connected to the air-cooled condenser through a pipe.

[0016] Preferably, an oil separator is provided in the pipeline between the heat pump and the heat exchange device.

[0017] Preferably, a mechanical pressure relief valve is also provided in the pipeline between the heat pump and the heat exchange device and / or in the pipeline between the heat pump and the condenser.

[0018] After adopting the above technical solution, the present invention has the following effects:

[0019] 1. The evaporator in this utility model heats and evaporates the original liquid in the tank by inputting high-temperature and high-pressure refrigerant into the bottom heat exchange device, thereby reducing the water content of the residual concentrated waste liquid. The PLC controller controls the start and stop of the heat pump according to the gas pressure data in the pipeline, so as to reduce the safety hazard of explosion caused by high pressure in the evaporator.

[0020] 2. This utility model places a pressure sensor in the pipeline between the heat pump and the heat exchange device, as well as in the pipeline between the heat pump and the condenser, which can more accurately and timely obtain the pressure data in the pipelines before and after the heat pump. At the same time, a mechanical pressure relief valve is also installed in the pipeline between the heat pump and the heat exchange device. When the PLC controller cannot shut down the heat pump, it can automatically relieve pressure when the pressure exceeds the set value of the mechanical pressure relief valve, thus avoiding safety problems.

[0021] 3. This utility model features a circulating refrigerant system, which effectively reduces production costs and minimizes pollution, thus achieving environmental protection. Furthermore, the inclusion of an oil separator in the circulation path separates the refrigerant oil from the circulating refrigerant, preventing oil-containing refrigerant from entering the path and affecting evaporation efficiency. This also improves operational safety and extends the service life of related components. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a diagram of the internal structure of this utility model.

[0024] Figure 3 for Figure 2 A-direction view.

[0025] Figure 4 for Figure 3 Enlarged view of point B.

[0026] Figure 5 This is a three-dimensional structural diagram of the evaporator of this utility model.

[0027] Figure 6 This is a top view of the evaporator of this utility model.

[0028] Figure 7 for Figure 6 The CC-direction cross-sectional view.

[0029] Figure 8 This is a three-dimensional structural diagram of the heat exchange device of this utility model.

[0030] Figure 9This is a three-dimensional structural diagram of the water storage tank of this utility model.

[0031] Figure 10 This is an exploded view of the water storage tank of this utility model.

[0032] Figure 11 This is a top view of the water storage tank of this utility model.

[0033] Figure 12 for Figure 11 DD section view.

[0034] Figure 13 This is a diagram showing the internal structure of the condenser of this utility model.

[0035] Main component symbols:

[0036] 1: Frame, 2: Evaporator, 21: Waste liquid inlet, 22: Steam outlet, 23: Heat exchange device, 231: Refrigerant pipe, 232: Refrigerant inlet manifold, 233: Refrigerant outlet manifold, 3: Condenser, 31: Steam inlet, 32: Condensate outlet, 33: Through pipe, 34: Baffle plate, 4: Air-cooled condenser, 5: Heat pump, 6: PLC controller, 7: Water storage tank, 71: Condensate inlet, 72: Backup condensate outlet, 73: Reserved drain outlet, 8: Vacuum pump, 9: Ejector, 10: Oil separator, 11: Pressure sensor, 12: Mechanical pressure relief valve. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0038] like Figures 1 to 3 and Figures 9 to 10 As shown, this utility model discloses an explosion-proof low-temperature evaporator, including: a frame 1 and an evaporator 2, a condenser 3, an air-cooled condenser 4, a heat pump 5, and a PLC controller 6 installed on the frame 1.

[0039] The evaporator 2 is equipped with a heat exchange device 23 to heat and evaporate the waste liquid, thereby reducing the water content of the residual concentrated waste liquid. The evaporator 2 is connected to the condenser 3, which condenses the steam generated by the evaporator 2.

[0040] The air-cooled condenser 4 is connected to the heat exchange device 23 inside the evaporator 2 to cool down the high-temperature and high-pressure refrigerant discharged from the heat exchange device 23, and then transport the cooled refrigerant to the condenser 3.

[0041] The heat pump 5 is connected to the condenser 3 to receive the refrigerant flowing out of the condenser 3 and heat and pressurize it, and then deliver the high-temperature and high-pressure refrigerant to the heat exchange device 23.

[0042] Combination Figures 5 to 7 As shown, in this embodiment, the evaporator 2 has a waste liquid inlet 21 on its side wall and a steam outlet 22 on its top. The condenser 3 has a steam inlet 31 and a condensate outlet 32, and the steam inlet 31 is connected to the steam outlet 22 of the evaporator 2 through a pipe.

[0043] Meanwhile, a pressure sensor 11 is installed in the pipeline between the heat pump 5 and the heat exchange device 23, and in the pipeline between the heat pump 5 and the condenser 3. The pressure sensor 11 is connected to the PLC controller 6 to transmit the pressure data in the pipeline, and the PLC controller 6 is also connected to the heat pump 5 to control the start and stop of the heat pump 5. In other embodiments, the pressure sensor 11 is installed in the pipeline between the heat pump 5 and the heat exchange device 23, or in the pipeline between the heat pump 5 and the condenser 3.

[0044] In this embodiment, a mechanical pressure relief valve 12 is also provided in the pipeline between the heat pump 5 and the heat exchange device 23. This valve automatically releases pressure when the pressure exceeds the set value of the mechanical pressure relief valve, preventing an explosion. In other embodiments, a mechanical pressure relief valve 12 is provided in both the pipeline between the heat pump 5 and the heat exchange device 23 and the pipeline between the heat pump 5 and the condenser 3, or specifically in the pipeline between the heat pump 5 and the condenser 3.

[0045] Combination Figure 11 and Figure 12 As shown, in this embodiment, the explosion-proof low-temperature evaporator further includes: a water storage tank 7, a condenser 3 disposed inside the water storage tank 7, a condensate inlet 71 disposed at the bottom of the water storage tank 7, the condensate inlet 71 being connected to the condensate outlet 32 ​​of the condenser 3 via a pipe, and a vacuum pump 8 disposed in the passage between the condensate outlet 32 ​​and the condensate inlet 71 to pump condensate from the condensate outlet 32 ​​to the condensate inlet 71.

[0046] Meanwhile, the side wall of the water storage tank 7 is provided with a spare condensate outlet 72, and the spare condensate outlet 72 is connected to the passage between the condensate outlet 32 ​​and the condensate inlet 71. A reserved drain outlet 73 is provided in the passage and is led to the outside of the frame 1 through a pipe.

[0047] Secondly, combining Figure 4As shown, in this embodiment, the connecting pipe between the condensate outlet 32 ​​and the condensate inlet 71 can also be connected to the vacuum pump 8 via the ejector 9 to form a circulation path. Thus, the Venturi effect can be used in this circulation path to generate negative pressure in the condenser 3, which in turn generates negative pressure in the evaporator 2, thereby lowering the boiling point of the waste liquid in the evaporator 2.

[0048] like Figure 13 As shown, the condenser 3 has several through pipes 33 inside, and the steam inlet 31 is configured with several openings corresponding to the through pipes 33, so that steam can be dispersed into the condenser 3 for sufficient condensation. In this embodiment, several arc-shaped baffles 34 are provided outside the through pipes 33. The baffles 34 are staggered and installed outside the through pipes 33 so that the refrigerant can fully contact the through pipes 33 for sufficient condensation of the steam.

[0049] Again, such as Figure 8 As shown, in this embodiment, the heat exchange device 23 is provided with multiple refrigerant pipes 231, which are stacked longitudinally, with each layer of refrigerant pipes 231 arranged in a vortex configuration; and they are collected through a refrigerant inlet manifold 232 and a refrigerant outlet manifold 233. The end of the refrigerant inlet manifold 232 is connected to the heat pump 5 via a pipe, and the end of the refrigerant outlet manifold 233 is connected to the air-cooled condenser 4 via a pipe.

[0050] In addition, in this embodiment, an oil separator 10 is provided in the pipeline between the heat pump 5 and the heat exchange device 23. By providing the oil separator 10, the oil in the refrigerant can be separated, preventing oil-containing refrigerant from entering the passage and affecting the evaporation efficiency. At the same time, it improves operational safety and extends the service life of related components.

[0051] The above description is only a preferred embodiment of the present utility model. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. An explosion-proof low-temperature evaporator, characterized in that, include: The frame (1) and the evaporator (2), condenser (3), air-cooled condenser (4), heat pump (5) installed inside the frame (1) and the PLC controller (6) installed on the frame (1). The evaporator (2) is equipped with a heat exchange device (23) to heat and evaporate the waste liquid. The evaporator (2) is connected to the condenser (3), and the condenser (3) condenses the steam generated by the evaporator (2). The air-cooled condenser (4) is connected to the heat exchange device (23) inside the evaporator (2) to cool down the high-temperature and high-pressure refrigerant discharged by the heat exchange device (23) and transport the cooled refrigerant to the condenser (3). The heat pump (5) is connected to the condenser (3) to receive the refrigerant flowing out of the condenser (3) and heat and pressurize it, and deliver the high-temperature and high-pressure refrigerant to the heat exchange device (23); A pressure sensor (11) is provided in the pipeline between the heat pump (5) and the heat exchange device (23) and / or in the pipeline between the heat pump (5) and the condenser (3). The pressure sensor (11) is connected to the PLC controller (6) to transmit the pressure data in the pipeline. The PLC controller (6) is also connected to the heat pump (5) to control the start and stop of the heat pump (5).

2. The explosion-proof low-temperature evaporator as described in claim 1, characterized in that: The evaporator (2) has a waste liquid inlet (21) on its side wall and a steam outlet (22) on its top. The condenser (3) is provided with a steam inlet (31) and a condensate outlet (32). The steam inlet (31) is connected to the steam outlet (22) of the evaporator (2) through a pipe.

3. The explosion-proof low-temperature evaporator as described in claim 2, characterized in that: Also includes: A water storage tank (7) is provided inside the water storage tank (7). A condenser (3) is provided at the bottom of the water storage tank (7). The condenser inlet (71) is connected to the condenser outlet (32) of the condenser (3) through a pipe. A vacuum pump (8) is provided in the passage between the condenser outlet (32) and the condenser inlet (71) to pump condensate from the condenser outlet (32) to the condenser inlet (71).

4. The explosion-proof low-temperature evaporator as described in claim 3, characterized in that: The side wall of the water storage tank (7) is provided with a spare condensate outlet (72), and the spare condensate outlet (72) is connected to the passage between the condensate outlet (32) and the condensate inlet (71), and a reserved drain outlet (73) is provided in the passage, and is led to the outside of the frame (1) through a pipe.

5. The explosion-proof low-temperature evaporator as described in claim 3, characterized in that: The connecting pipe between the condensate outlet (32) and the condensate inlet (71) is connected to the vacuum pump (8) through the ejector (9) to form a circulation path.

6. The explosion-proof low-temperature evaporator as described in claim 2, characterized in that: The condenser (3) is provided with several through pipes (33) inside, and the steam inlet (31) is provided with several openings corresponding to the through pipes (33) so that steam can be dispersed into the condenser (3) for full condensation.

7. The explosion-proof low-temperature evaporator as described in claim 6, characterized in that: The outside of the pipe (33) is provided with several arc-shaped baffles (34). The baffles (34) are installed alternately on the outside of the pipe (33) so that the refrigerant can fully contact the pipe (33) and fully condense the steam.

8. The explosion-proof low-temperature evaporator as described in claim 1, characterized in that: The heat exchange device (23) is provided with multiple refrigerant pipes (231), which are stacked longitudinally and arranged in a spiral pattern on each layer. The refrigerant pipes (231) are connected through a refrigerant inlet manifold (232) and a refrigerant outlet manifold (233). The end of the refrigerant inlet manifold (232) is connected to the heat pump (5) through a pipe, and the end of the refrigerant outlet manifold (233) is connected to the air-cooled condenser (4) through a pipe.

9. The explosion-proof low-temperature evaporator as described in claim 1, characterized in that: An oil separator (10) is installed in the pipeline between the heat pump (5) and the heat exchange device (23).

10. An explosion-proof low-temperature evaporator as described in any one of claims 1-9, characterized in that: A mechanical pressure relief valve (12) is also provided in the pipeline between the heat pump (5) and the heat exchange device (23) and / or in the pipeline between the heat pump (5) and the condenser (3).

Images