Vacuum distillation wastewater treatment system

Abstract

The application mainly introduces a kind of vacuum distillation wastewater treatment system, wastewater is sprayed to the coil of heat exchanger, forms water vapor and is transported out, residual liquid flows out through the bottom of heat exchanger. There is a compressor, the compressor is composed of main machine, condenser, evaporator, electronic expansion valve and other parts. The compressor compresses refrigerant, releases heat, as the heat source of the above-mentioned internal hot water of coil. The refrigerant passes through the electronic expansion valve, is reduced in pressure and gasified, flows into the evaporator, the refrigerant absorbs the heat of the above-mentioned water vapor through the evaporator, the water vapor is cooled to clear water and flows into the clear water tank. The application uses the working principle of compressor to treat wastewater, improves energy utilization efficiency, reduces the use of fluid medium, and greatly improves heat exchange efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the cross-disciplinary technical field of the combination of mechatronics technology and environmental protection technology, and particularly relates to a new application technology of a compressor. BACKGROUND

[0002] Vacuum distillation is an important method for separating and purifying compounds, and vacuum distillation is suitable for separating and purifying high-boiling-point substances and compounds that are decomposed, oxidized or polymerized when heated before reaching the boiling point under normal pressure.

[0003] A compressor is a driven fluid machine for lifting low-pressure gas to high-pressure gas, and is the heart of a refrigeration system.

[0004] The compressor sucks in low-temperature and low-pressure refrigerant gas from a suction pipe, and discharges high-temperature and high-pressure refrigerant gas to a discharge pipe after compression by a motor driving a piston, thereby providing power for a refrigeration cycle to realize a refrigeration cycle of compression → condensation (heat release) → expansion → evaporation (heat absorption).

[0005] Functions of the compressor:

[0006] 1) Compressed gas is used for refrigeration and separation:

[0007] Gas is liquefied by compression, cooling and expansion. It is used in artificial refrigeration (freezing, refrigeration and air conditioning, such as ammonia and freon compressors, which are called refrigeration compressors. In addition, liquefied gas, if it is a mixture, can be separated into pure gas of each component according to its different gasification temperature in a separation device; that is, each component is separated by compression and then cooled at different temperatures.

[0008] 2) Compressed air as power:

[0009] Compressed air is used to drive various pneumatic machines and tools, control instruments and automation devices, and is also used for the launch of some weapons in national defense and scientific research, the sinking and floating of submarines, and the salvage of sunken ships, all of which require different gas pressures. Compressed air is considered to be the second power source next to electricity.

[0010] 3) Gas transportation:

[0011] Compressors for pipeline gas transportation determine the pressure according to the length of the pipeline, and the pressure for transporting coal gas is 3-30 bar. Compressors for gas bottling are determined according to the properties of the gas. Some gases with high critical temperatures and easy to liquefy can be first compressed and then cooled to liquefy and bottle. The widely used bottled liquefied petroleum gas is now widely used.

[0012] As can be seen, in the prior art, the compressor basically has no main purpose for heat exchange. SUMMARY

[0013] The present application provides a new use of a compressor, especially a pressure reduction distillation wastewater treatment system which can improve energy utilization efficiency and reduce the cost of fluid medium.

[0014] TECHNICAL SCHEME

[0015] The present application provides a pressure reduction distillation wastewater treatment system, which introduces wastewater source into a heat exchanger, sprays the wastewater onto the coil of the heat exchanger through a spray head, and introduces hot water into the coil (also introduces hot water into the interlayer of the heat exchanger for heat preservation). The wastewater sprayed on the heat exchange coil is heated and evaporated to form high-temperature and high-humidity water vapor. The water vapor (containing air) formed by the heating and vaporization of the coil is transported out. The residual liquid in the wastewater that cannot be vaporized flows out through the residual liquid pipeline at the bottom of the heat exchanger.

[0016] The water vapor transported out is cooled by a cooling device to become clean water and flows into a clean water tank. There is also a compressor, which is composed of a main machine, a condenser, an evaporator, an electronic expansion valve, a high-low pressure controller and other components, and a refrigerant flows therein.

[0017] Under the control of the high-low pressure controller, the compressor compresses the refrigerant under the power of the main machine, and the refrigerant can be liquefied in the condenser. At the same time, the refrigerant is liquefied to release heat, and the liquefied refrigerant flows into the condenser tank. Preferably, the heat generated by the liquefaction is used as the heat source of the hot water in the coil (the inlet and outlet pipelines of the coil are connected to the condenser for heat exchange). Further preferably, the refrigerant flows through the coil, and the heat released by the liquefaction is directly transmitted to the coil wall to directly heat and evaporate the wastewater, so that the heat transfer efficiency is higher, the heat loss is almost zero, the auxiliary management is less, and the investment is smaller.

[0018] If the heat of the refrigerant is not enough to meet the heat exchange requirement, a vacuum pump is arranged above the bypass pipeline to reduce the air pressure in the water vapor evaporation area to form negative pressure and promote evaporation. The lower the temperature of the refrigerant, the smaller the air pressure.

[0019] Under the control of the high-low pressure controller, the refrigerant in the condenser tank is vaporized after passing through the electronic expansion valve, and flows into the evaporator (which can be one or two in parallel) of the compressor. The refrigerant evaporates in the evaporator to generate cold energy, and the evaporator absorbs heat from the outside at the same time. Preferably, the heat required for the vaporization is derived from the water vapor transported out (the water vapor transported out flows through the outside of the evaporator of the compressor). After heat exchange in the evaporator, the water vapor is cooled to become clean water.

[0020] The refrigerant heated again flows into the compressor, is compressed and liquefied to release heat. The above process is repeated, and by using the working process of the compressor, clean water and residual liquid can be obtained by purifying and separating the wastewater.

[0021] Preferably, the hot water enters the heat exchanger in two streams: one stream flows into the water tank jacket (to insulate the coil and improve its heat exchange efficiency), and the other stream flows into the coil itself. The clean water tank is located below the evaporator; preferably, a vacuum pump is used to create a vacuum in the clean water tank, forming a negative pressure that allows high-temperature, high-humidity steam to automatically flow through the evaporator for cooling.

[0022] The preferred compressor features an electronic expansion valve equipped with a self-regulating thermostat, which automatically monitors the refrigerant temperature and adjusts the flow switch of the electronic expansion valve. When the refrigerant temperature is high, the valve opening is reduced; when the temperature is low, the valve opening is increased, allowing water vapor to be cooled into clean water.

[0023] Beneficial effects:

[0024] This invention can separate and purify wastewater into a large amount of clean water and non-vaporizable residual liquid, thus achieving preliminary treatment of large quantities of wastewater.

[0025] By utilizing the working principle of a compressor for wastewater treatment, energy efficiency is improved; this also pioneers new operating methods and application areas for compressors. By using refrigerant in external heat exchange, the use of other fluid media is reduced, external piping is minimized, and operating costs are lowered. The heat conversion between the two fluids is more direct, further enhancing heat exchange efficiency.

[0026] The vacuum pump installed on the clean water tank can divert water vapor, which can reduce the need for installing and using a steam transfer pump. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a component connection structure and process flow according to the present invention.

[0028] Figure 2 It is a major component of the compressor of this invention.

[0029] In the diagram, 1-pipeline valve; 2-wastewater pump; 3-heat exchanger; 4-compressor main unit; 5-evaporator; 6-hot water pump; 7-condenser; 8-condensate tank; 9-clean water tank; 10-vacuum pump; 11-clean water pump; 12-oil separator; 13-high and low pressure controller; 14-filter; 15-gas-liquid separator; 16-thermostat; 17-electronic expansion valve; 20-compressor. Detailed Implementation

[0030] Example 1:

[0031] like Figure 1 The invention shown includes a heat exchanger 3 and a compressor. The heat exchanger 3 has a heat exchange coil; the compressor consists of the following components: a main unit (4), a condenser 7, an evaporator 5, an electronic expansion valve 17, and a high and low pressure controller 13.

[0032] The compressor or oil separator 12 separates the lubricating oil from the high pressure steam discharged by the refrigeration compressor main unit, and the refrigerant then flows into the condenser; the refrigerant is returned to the main unit before the evaporator or has a filter 14 to filter solid impurities; another or gas-liquid separator 15 separates the gaseous refrigerant from the liquid refrigerant between the evaporator and the main unit.

[0033] First, the wastewater is introduced into the heat exchanger 3 and sprayed onto the hot water coil inside the heat exchanger 3, and the wastewater is heated and evaporated to form water vapor for delivery; the water vapor is cooled by the cooling device to become clean water and flow into the clean water tank 9; the residual liquid that cannot be vaporized in the wastewater flows out through the residual liquid pipeline at the bottom of the heat exchanger 3.

[0034] Under the control of the high-low pressure controller 13, the compressor main unit 4 is powered to compress the refrigerant, which is liquefied in the condenser 7, and the refrigerant releases heat while being liquefied; the heat generated by the liquefaction is used as the heat source for the hot water in the above-mentioned coil.

[0035] Then, under the control of the high-low pressure controller 13, the refrigerant in the condenser tank 8 is vaporized by the electronic expansion valve 17 and flows into the evaporator 5. The refrigerant absorbs the heat of the above-mentioned water vapor in the evaporator 5, and the water vapor is cooled to become clean water and flows into the clean water tank 9.

[0036] Example Two:

[0037] In Example One, the heat released by the liquefaction of the refrigerant heats the hot water, which is divided into two paths into the heat exchanger 3, one path flows into the water tank interlayer to keep the coil warm; one path flows into the coil to heat the wastewater to produce water vapor.

[0038] In addition, a vacuum pump 10 is used to vacuum the clean water tank 9, so that the clean water tank 9 forms a negative pressure, so that the water vapor can automatically flow through the evaporator 5 for cooling, saving the delivery pump of the water vapor pipeline.

Claims

1. A pressure-reducing distillation wastewater treatment system, equipped with a compressor, the compressor having components: a main machine (4), a condenser (7), an evaporator (5), an electronic expansion valve, a high-low pressure controller; characterized in that: The wastewater source is introduced into the heat exchanger (3) and sprayed onto the coil inside the heat exchanger (3) through which hot water is circulated, the wastewater is heated and evaporated by the coil to form high-temperature water vapor, which is transported out; after cooling in the cooling device evaporator (5), it becomes clean water and flows into the clean water tank (9); the residual liquid in the wastewater that cannot be vaporized flows out through the residual liquid pipeline at the bottom of the heat exchanger (3); Under the control of the high-low pressure controller, the compressor compresses the refrigerant under the action of the main machine power, and the refrigerant is liquefied in the condenser (7); the refrigerant is liquefied at the same time to release heat; the heat generated by the liquefaction is used as the heat source for the hot water inside the coil; the hot water enters the heat exchanger (3) in two ways, one way flows into the water tank interlayer, and the other way flows into the coil; the clean water tank (9) is arranged below the evaporator (5), a vacuum pump (10) is used to pump the clean water tank (9) to form a negative pressure, so that the water vapor can automatically flow through the evaporator (5) after cooling and flow into the clean water tank (9).

2. The reduced pressure distillation wastewater treatment system of claim 1, wherein: Under the control of the high-low pressure controller, the refrigerant in the condenser tank (8) is vaporized by the electronic expansion valve, and flows into the inside of the evaporator (5); the refrigerant absorbs heat from the outside in the evaporator (5); the heat comes from the high-temperature water vapor transported out above; after heat exchange in the evaporator (5), the high-temperature water vapor is cooled to become clean water.

3. The reduced pressure distillation wastewater treatment system as claimed in claim 1 or 2, characterized by: The refrigerant flows through the coil, and the heat released by the liquefaction is directly transmitted to the coil wall to heat and evaporate the wastewater.

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