Vortex tube steam recompression device

Abstract

The vortex tube steam recompression device includes a three-phase mixing reaction device, a steam recompression device, and a condensing water device. The vortex temperature separation effect is used to improve energy efficiency. It can complete a series of functions including mother liquor heating, mother liquor concentration and crystallization, steam-water separation, and slurry output under the conditions of insufficient or no steam supply in the primary steam supply and low secondary steam quality. The requirements for the steam power source are not high, and the expensive centrifugal compressor can be omitted. The Roots compressor with low speed and large pressure difference can meet the realization of the process. It overcomes the problems of harsh operating conditions and difficult control of existing MVR equipment, and provides an evaporation concentration (crystallization) device with high efficiency in a weak vacuum environment without steam supply, reducing the difficulty of control and operation.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical industry, relates to the comprehensive utilization of evaporation concentration (crystallization) of a mother liquor treatment process, and relates to a vortex tube steam recompression device. Background Art

[0002] Vortex tube, also known as Ranque-Hilsch tube - the air inlet is connected to the compressed gas, and the two air outlets can automatically separate the cold and hot air. It has a simple structure and low price, and is widely used in various cooling scenarios in industry. The compressed gas expands in the nozzle and enters the vortex tube at a high speed along the tangent direction. When the airflow rotates at high speed in the vortex tube, it is separated into two parts of airflow, with a low center temperature and a high outer temperature. The vortex tube is designed with opposite cold and hot outlets, with cold air coming out from the left and hot air coming out from the right. There is also a design with cold and hot in the same direction, but the separation efficiency will be much lower in comparison.

[0003] Direct contact heat exchange refers to the process in which the medium directly contacts and transfers heat. It is not restricted by the solid wall surface, so it has a higher heat transfer efficiency. At the same time, the contact area between the medium is increased, the equipment structure is simplified, and the heat exchange process is rapid and efficient. The direct contact heat exchange of steam and water is divided into jet type, bead type, film type, and bubble type according to the movement and contact mode of the two. It involves the growth and separation process of bubbles and is widely used in many industrial devices such as heat exchangers, electronic cooling, chemical processing, and sewage treatment. Due to the phase change process, the process is more complicated.

[0004] The three common evaporation, concentration and crystallization equipment processes are thermal vapor recompression (TVR), multiple effect evaporation (MEE), and mechanical vapor recompression (MVR). To further improve energy efficiency, there is a practice of combining the above processes, such as 2R two-stage compression technology, which improves the quality of secondary steam under the joint action of mechanical compressor and heat pump.

[0005] The core of evaporation crystallization is to increase the amount of evaporated water per unit time, that is, the evaporation rate, and quickly realize the process from low concentration to high concentration. To this end, during the operation of the equipment, it is necessary to maintain a high steam quality and maintain the effect of circulating heating. The existing process methods also revolve around this core. In particular, vacuum crystallization, also known as vacuum adiabatic cooling crystallization, is a crystallization method in which the solution flash evaporates and adiabatically cools under vacuum. Vacuum crystallization essentially relies on concentration and cooling to produce supersaturation and crystallization. The principle of flash evaporation is used, which changes from one thermodynamic equilibrium state to the next thermodynamic equilibrium state. The pressure is reduced, and part of the sensible heat is released. This part of the excess heat will be absorbed in the form of latent heat, and the water is "flashed" into steam.

[0006] In order to control the overall vacuum degree and the temperature of the evaporating material and maintain a high evaporation rate, the process equipment in the prior art must have a main structure with a large diameter and height, and is usually installed in a multi-story factory building with a height of more than 20 meters. Summary of the invention

[0007] The purpose of the present invention is to provide a vortex tube steam recompression device, which is used to reduce the stringent requirements of the evaporation crystallization process on the secondary steam quality and vacuum environment, and provide a new solution for rapid evaporation in a weak vacuum environment without steam supply. The vortex temperature separation effect is used to simplify the evaporation, concentration and crystallization process, improve energy efficiency, and reduce the difficulty of control and operation. The device can be arranged in a single-story factory building to reduce scale and cost.

[0008] Technical solution of the invention:

[0009] It includes a three-phase mixing reaction device, a steam recompression device and a condensing water device. The three-phase mixing reaction device comprises a mother liquid storage tank, a mother liquid delivery pump, a plate heat exchanger, a three-phase tank, a tank body liquid level gauge, industrial monitoring, a tank body pressure transmitter, a discharge screw pump, a return valve, a discharge valve and a connecting pipe. The outlet flange at the bottom of the mother liquid storage tank is connected to the pump inlet of the mother liquid delivery pump through a pipe and a flange, the pump outlet of the mother liquid delivery pump is connected to the feed port of the plate heat exchanger through a pipe and a flange, the discharge port of the plate heat exchanger is connected to the tank top feed port of the three-phase tank through a pipe and a flange, the tank bottom discharge port of the three-phase tank is connected to the pump inlet of the discharge screw pump through a pipe and a flange, the pump outlet of the discharge screw pump is connected to the return valve and the discharge valve through a tee and a flange, the return valve is connected to the return port on the side wall of the three-phase tank through a pipe and a flange, the discharge valve is connected to the outside of the system, the tank body liquid level gauge is connected to the side wall of the three-phase tank through a flange, and the industrial monitoring and tank body pressure transmitter are fixed to the top center position of the three-phase tank through a flange.

[0010] The steam recompression device comprises a three-phase tank, a steam mixer, a vortex tube, a superheating chamber, a hot end pressure transmitter, a hot end temperature transmitter, an ejector, a steam-water separation tank, an overpressure valve, a Roots compressor, a cold end working manual valve, a cold end exhaust manual valve and a connecting pipe. The exhaust port on the top of the three-phase tank is connected to the suction port of the ejector through a pipe and a flange, the exhaust port of the ejector is connected to the air inlet on the top of the steam-water separation tank through a pipe and a flange, the exhaust port on the top of the steam-water separation tank is connected to the air inlet of the Roots compressor and the overpressure valve through a pipe and a flange in a three-way connection. The overpressure valve is connected to the outside of the system for exhaust. The outlet of the Roots compressor is connected to the inlet of the vortex tube through a pipe row. The hot end outlet of the vortex tube is connected to the superheat chamber through the pipe row. The superheat chamber is connected to the inlet of the steam mixer through a pipe and a flange. The cold end outlet of the vortex tube is connected to the working flow inlet of the ejector through a pipe row. There is a cold end working manual valve between the cold end of the vortex tube and the ejector. A cold end exhaust manual valve is arranged upstream of the cold end working manual valve through a three-way valve to connect to the atmosphere. The hot end pressure transmitter and the hot end temperature transmitter are fixed to the superheat chamber through threads.

[0011] The condensate device comprises a plate heat exchanger, a steam-water separation tank, a condensate pump, a circulating water control valve, a heating water inlet thermometer, a heating water outlet thermometer, a liquid level control valve, a distribution plate and connecting pipes. The drain outlet of the steam-water separation tank is connected to the pump inlet of the condensate pump through pipes and flanges, the pump outlet of the condensate pump is connected to the circulating water control valve through pipes and flanges, the circulating water control valve is connected to the water inlet of the plate heat exchanger through pipes and flanges, the water outlet of the plate heat exchanger is connected to the return water port of the steam-water separation tank and the liquid level control valve through pipes and flanges in a three-way connection, the heating water inlet thermometer and the heating water outlet thermometer are respectively fixed to the inlet and outlet pipes of the plate heat exchanger by threads, the liquid level control valve is connected to the outside of the system, the return water port of the steam-water separation tank is connected to the distribution plate by a flange, and the distribution plate is fixed to the lower side of the interior of the steam-water separation tank by a bracket.

[0012] The best setting value can be found by evaluating the final drainage volume and drainage temperature of the system, verifying the liquid level and vacuum degree of the three-phase tank, the opening of the hot end regulating valve, the temperature and pressure of the superheat chamber and other factors.

[0013] The present invention improves the application of evaporation, concentration and crystallization process in weak vacuum environment, uses vortex temperature separation effect to improve energy efficiency, and can complete a series of functions including mother liquor heating, mother liquor concentration (crystallization), steam-water separation, and slurry output under the conditions of insufficient primary steam supply (or no steam supply) and low secondary steam quality. The requirements for the steam power source are not high, and the expensive centrifugal compressor can be omitted. The Roots compressor with low speed and large pressure difference can meet the realization of the process. Therefore, the beneficial effects of the present invention are: overcoming the problems of harsh operating conditions and difficult control of existing MVR equipment, providing an evaporation concentration (crystallization) device with high efficiency in a weak vacuum environment without steam supply, and reducing the difficulty of control and operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of a vortex tube steam recompression device.

[0015] Figure 2 Schematic diagram of the working process of the vortex tube.

[0016] Figure 3 This is a schematic diagram of the ejector operation.

[0017] Figure 4 This is a schematic diagram of the working of a steam mixer.

[0018] In the figure: 1-mother liquor storage tank, 2-mother liquor delivery pump, 3-plate heat exchanger, 4-three-phase tank, 5-steam mixer, 6-tank liquid level gauge, 7-industrial monitoring, 8-tank pressure transmitter, 9-vortex tube, 10-hot end regulating hand valve, 11-superheating chamber, 12-hot end pressure transmitter, 13-hot end temperature transmitter, 14-ejector, 15-steam-water separation tank, 16-steam-water liquid level gauge, 17-condensate pump, 18-circulating water control valve, 19-heating water inlet thermometer, 20-heating water outlet thermometer, 21-liquid level control valve, 22-distribution plate, 23-secondary steam pressure transmitter, 24-overpressure valve, 25-Roots compressor, 26-discharge screw pump, 27-return valve, 28-discharge valve, 29-cold end working hand valve, 30-cold end exhaust hand valve. DETAILED DESCRIPTION

[0019] The content of the invention is further explained below with reference to the embodiments of the accompanying drawings.

[0020] Figure 1 As shown: the vortex tube steam recompression device includes three parts, namely a three-phase mixing reaction device, a steam recompression device and a condensing water device. The material enters the three-phase mixing reaction device, and the steam recompression device processes the steam generated by the three-phase mixing reaction device, so that the steam circulates in the three-phase mixing reaction device, and part of the steam is discharged outside the system through the condensing water device.

[0021] The three-phase mixing reaction device comprises a mother liquid storage tank 1, a mother liquid delivery pump 2, a plate heat exchanger 3, a three-phase tank 4, a tank liquid level meter 6, an industrial monitoring device 7, a tank pressure transmitter 8, a discharge screw pump 26, a return valve 27, a discharge valve 28 and connecting pipes. The outlet flange at the bottom of the mother liquid storage tank 1 is connected to the pump inlet of the mother liquid delivery pump 2 through a pipeline and a flange, the pump outlet of the mother liquid delivery pump 2 is connected to the feed port of the plate heat exchanger 3 through a pipeline and a flange, the discharge port of the plate heat exchanger 3 is connected to the pool top feed port of the three-phase tank 4 through a pipeline and a flange, the pool bottom discharge port of the three-phase tank 4 is connected to the pump inlet of the discharge screw pump 26 through a pipeline and a flange, the pump outlet of the discharge screw pump 26 is connected to the return valve 27 and the discharge valve 28 through a tee and a flange, the return valve 27 is connected to the return port on the side wall of the three-phase tank 4 through a pipeline and a flange, the discharge valve 28 is connected to the outside of the system, the tank level meter 6 is connected to the side wall of the three-phase tank 4 through a flange, and the industrial monitoring 7 and the tank pressure transmitter 8 are fixed to the top center position of the three-phase tank 4 through flanges.

[0022] The steam recompression device includes a three-phase tank 4, a steam mixer 5, a vortex tube 9, a superheat chamber 11, a hot end pressure transmitter 12, a hot end temperature transmitter 13, an ejector 14, a steam-water separator 15, an overpressure valve 24, a Roots compressor 25, a cold end working manual valve 29, a cold end exhaust manual valve 30 and connecting pipes. The exhaust port on the top of the three-phase tank 4 is connected to the suction port of the ejector 14 through pipes and flanges, the exhaust port of the ejector 14 is connected to the air inlet on the top of the steam-water separator 15 through pipes and flanges, the exhaust port on the top of the steam-water separator 15 is connected to the air inlet of the Roots compressor 25 and the overpressure valve 24 through pipes and flanges in a three-way connection, the overpressure valve 24 is connected to the outside of the system for emptying, the outlet of the Roots compressor 25 is connected to the air inlet of the vortex tube 9 through a pipe row, and the hot end outlet of the vortex tube 9 is connected to the air inlet of the vortex tube 9 through a pipe row. The row is connected to the superheating chamber 11, and the superheating chamber 11 is connected to the air inlet of the steam mixer 5 through pipes and flanges. Similarly, the cold end air outlet of the vortex tube 9 is connected to the working flow inlet of the ejector 14 through the pipe row. There is a cold end working manual valve 29 between the cold end of the vortex tube 9 and the ejector 14. A cold end exhaust manual valve 30 is arranged upstream of the cold end working manual valve 29 through a three-way arrangement to connect to the atmosphere. The hot end pressure transmitter 12 and the hot end temperature transmitter 13 are fixed to the superheating chamber 11 by threads.

[0023] The condensing water device comprises a plate heat exchanger 3, a steam-water separation tank 15, a condensing water pump 17, a circulating water control valve 18, a heating water inlet thermometer 19, a heating water outlet thermometer 20, a liquid level control valve 21, a distribution plate 22 and connecting pipes. The drain outlet of the steam-water separation tank 15 is connected to the pump inlet of the condensate pump 17 through a pipe and a flange, the pump outlet of the condensate pump 17 is connected to the circulating water control valve 18 through a pipe and a flange, the circulating water control valve 18 is connected to the water inlet of the plate heat exchanger 3 through a pipe and a flange, the water outlet of the plate heat exchanger 3 is connected to the return water port of the steam-water separation tank 15 and the liquid level control valve 21 through a pipe and a flange in a three-way connection, the heating water inlet thermometer 19 and the heating water outlet thermometer 20 are respectively fixed on the inlet and outlet pipes of the plate heat exchanger 3 by threads, the liquid level control valve 21 is connected to the outside of the system, the return water port of the steam-water separation tank 15 is connected to the distribution plate 22 by a flange, and the distribution plate 22 is fixed to the lower side of the interior of the steam-water separation tank 15 by a bracket.

[0024] Working process and principle:

[0025] Before operation, check the valve positions: the hot end regulating manual valve 10 is opened to the maximum, the circulating water control valve 18 and the liquid level control valve 21 are closed, the overpressure valve 24 is closed, the return valve 27 is opened, the discharge valve 28 is closed, the cold end exhaust manual valve 30 is opened, and the cold end working manual valve 29 is closed.

[0026] The water and electricity conditions of the Roots compressor 25 are met, and the Roots compressor 25 is started at the lowest frequency. At this time, the working conditions are: the hot end of the vortex tube 9 outputs hot air (the temperature and pressure of the superheated chamber 11 increase), the temperature of the cold end of the vortex tube 9 drops and the cold air is discharged to the atmosphere, and the three-phase tank 4-steam-water separator slowly changes to a weak vacuum environment.

[0027] Observe until the changes in the indications of the hot-end pressure transmitter 12, the hot-end temperature transmitter 13 and the tank pressure transmitter 8 slow down. At this time, the working conditions are: the temperature of the three-phase tank 4 and the steam-water separation tank 15 rises to above 80°C, the heating source is the hot-end air discharged from the steam mixer 5, and the cold-end air is discharged to the atmosphere, and the internal air pressure of the three-phase tank 4-steam-water separation tank 15 maintains a weak vacuum.

[0028] The mother liquor delivery pump 2 is turned on, and the mother liquor passes through the plate heat exchanger 3 and enters the three-phase tank 4. The discharging screw pump 26 is turned on, and the mother liquor circulates in the three-phase tank 4 through the return valve 27. At this time, the working conditions are: there is no condensed water in the system, and the plate heat exchanger 3 is not working. The mother liquor evaporates a small amount in the three-phase tank 4, and the weak vacuum environment is compensated and slowly changes to a slightly positive pressure. The heating source is an air-steam mixture. During the pressurized circulation of the mixed gas, the hot end of the vortex tube 9 heats up, and the mixed gas is always in a gaseous state. The cold end cools down, and the discharged mixed gas has a misting phenomenon, which is formed by the cooling and condensation of the steam therein. Wait for the misting phenomenon of the exhaust gas at the cold end of the vortex tube 9 to be stable. At this time, the air-steam mixture is mainly steam.

[0029] Open the circulating water control valve 18, open the cold end working manual valve 29, and close the cold end exhaust manual valve 30. At this time, the high-speed fluid at the cold end of the vortex tube 9 enters the ejector 14, mixes with the steam in the three-phase tank 4 in the ejector 14 to form saturated steam with water, enters the steam-water separation tank 15, passes through the distribution plate 22, the temperature of the steam-water separation tank 15 is reduced, and a large amount of condensed water is formed.

[0030] The indication of the steam-water level gauge 16 exceeds 50%, which can ensure that the circulating water pipe is full of condensed water, and the condensed water pump 17 is turned on to increase the working frequency of the Roots compressor 25. At this time, the working conditions are: the inlet and outlet pressure difference of the Roots compressor 25 increases, the temperature difference between the hot end and the cold end of the vortex tube 9 is further widened, the latent heat of the superheated steam at the hot end increases, and the water content of the wet saturated steam at the cold end increases, and the plate heat exchanger 3 begins to take effect. System stable working process:

[0031] ① Vortex tube 9—superheat chamber 11—steam mixer 5, the medium is high-pressure, superheated steam (above 150°C), superheated steam microbubbles release latent heat in the mother liquor, evaporate water at the bubble interface, increase in volume, form local steam-water co-evaporation, steam kinetic energy transfer, drive the mother liquor to flow, and crystal particles are not easy to settle; adjust the liquid level of the three-phase tank 4, observe the gas production of steam-water co-evaporation through industrial monitoring 7, and determine the optimal liquid level when the evaporation is maximum.

[0032] ② The high-speed fluid at the cold end of the vortex tube 9 is ejected to extract the saturated steam produced by mixing the superheated steam and the mother liquor in the three-phase tank 4, so that the three-phase tank 4 maintains a weak vacuum and accelerates evaporation. The size of the vacuum degree is related to the flow rate of the fluid at the cold end; by adjusting the opening of the hot end regulating valve 10, the temperature difference and flow rate ratio between the cold and hot ends of the vortex tube 9 are changed, thereby changing the evaporation amount and vacuum degree of the three-phase tank 4.

[0033] ③ Vortex tube 9—ejector 14—steam-water separation tank 15, the medium is relatively low-temperature wet saturated steam (negative pressure condition 90-100°C), which is in direct contact with the condensate return water with an even lower temperature (40-60°C) on the distribution plate 22 for heat exchange, and the condensate output increases, and the liquid level control valve 21 is opened to stabilize the liquid level of the steam-water separation tank 15.

[0034] The best setting value can be found by evaluating the final drainage volume and drainage temperature of the system, verifying the liquid level and vacuum degree of the three-phase tank 4, the opening of the hot end regulating valve 10, the temperature and pressure of the superheat chamber 11 and other factors.

[0035] In particular, when there is no steam supply, the following steps are used to start the machine:

[0036] ① Before operation, check the valve positions: the hot end regulating hand valve 10 is opened to the maximum, the circulating water control valve 18 and the liquid level control valve 21 are closed, the overpressure valve 24 is closed, the return valve 27 is opened, the discharge valve 28 is closed, the cold end exhaust hand valve 30 is opened, and the cold end working hand valve 29 is closed;

[0037] ② The water and electricity conditions of the Roots compressor 25 are met, and the Roots compressor 25 is started at the lowest frequency;

[0038] ③ Observe until the indications of the hot end pressure transmitter 12, the hot end temperature transmitter 13 and the tank pressure transmitter 8 slow down, then start the mother liquid delivery pump 2, the mother liquid passes through the plate heat exchanger 3 and enters the three-phase tank 4, start the discharge screw pump 26, and the mother liquid circulates in the three-phase tank 4 through the return valve 27;

[0039] ④ Open the circulating water control valve 18, open the cold end working manual valve 29, and close the cold end exhaust manual valve 30;

[0040] ⑤ Observe that the indication of the steam-water level gauge 16 exceeds 50%, which can ensure that the circulating water pipe is full of condensed water, turn on the condensed water pump 17, increase the operating frequency of the Roots compressor 25, and ensure stable operation of the device.

[0041] During the operation of the device, the medium is high-pressure, superheated steam (above 150°C) at the hot end of the vortex tube 9 - the superheated chamber 11 - the steam mixer 5. The microbubbles of the superheated steam release latent heat in the mother liquor, and the water evaporates at the bubble interface, the volume increases, and local steam-water co-evaporation is formed. The kinetic energy of the steam is transferred, driving the mother liquor to flow, and the crystal particles are not easy to settle.

[0042] During the operation of the device, the high-speed fluid at the cold end of the vortex tube 9 is ejected to extract the saturated steam produced by mixing the superheated steam and the mother liquid in the three-phase tank 4, so that the three-phase tank 4 maintains a weak vacuum and accelerates evaporation.

[0043] When the device is running stably, the medium of the cold end of the vortex tube 9 - ejector 14 - steam-water separation tank 15 is relatively low-temperature wet saturated steam, and the negative pressure condition is 90-100°C. It directly contacts and exchanges heat with the condensate return water at a lower temperature of 40-60°C on the distribution plate, and a large amount of condensate is produced.

[0044] Figure 2 As shown, the pressurized steam from the screw compressor 25 enters from the inlet of the vortex tube 9. Due to the internal structure, the pressurized steam is separated into cold and hot air flows when rotating at high speed in the vortex tube. The center temperature is low and the outer temperature is high. The existence of the hot end regulating manual valve 10 allows the heated superheated steam to go to the steam mixer 5 from the superheating chamber 11 on the left side (hot end), and also allows the cooled wet saturated steam to go to the ejector 14 from the right side (cold end) through the cold end working manual valve 29.

[0045] Figure 3As shown: the wet saturated steam output from the cold end of the vortex tube 9 serves as the ejection flow of the ejector 14, and forms a high-speed airflow after passing through the convergent nozzle of the ejector 14, while the flash saturated steam of the three-phase tank 4 serves as the ejected flow. Due to the ejection effect, a higher vacuum is formed at the nozzle outlet, and the steam in the three-phase tank 4 is drawn away and mixed into uniform wet saturated steam.

[0046] Figure 4 As shown: the superheated steam output from the hot end of the vortex tube 9 enters the steam mixer 4 and is sprayed into the mother liquid through the steam mixer 4. Because there are tiny inclined holes on the wall plate of the steam mixer 4, the steam microbubbles generated have a strong induced effect on the surrounding cold water, forming rotating water vapor, controlling the liquid level of the mother liquid, so that the superheated steam microbubbles leave the liquid surface before the latent heat is completely released and enter the gas phase of the three-phase tank 4, without allowing the steam and the cold water to completely exchange heat.

Claims

1. A vortex tube steam recompression device, characterized in that: It includes a three-phase mixed reaction device, a steam recompression device, and a condensing water device. The mother liquor enters the three-phase mixed reaction device. The steam recompression device processes the steam generated by the three-phase mixed reaction device to make the steam circulate in the three-phase mixed reaction device, and part of the steam is discharged to the outside of the system through the condensing water device. The three-phase mixing reaction device comprises a mother liquid storage tank, a mother liquid delivery pump, a plate heat exchanger, a three-phase tank, a tank body liquid level meter, industrial monitoring, a tank body pressure transmitter, a discharge screw pump, a return valve, a discharge valve and a connecting pipe. The outlet flange at the bottom of the mother liquid storage tank is connected to the pump inlet of the mother liquid delivery pump through a pipe and a flange. The pump outlet of the mother liquid delivery pump is connected to the feed port of the plate heat exchanger through a pipe and a flange. The discharge port of the plate heat exchanger is connected to the feed port of the top of the three-phase tank through a pipe and a flange. The discharge port of the bottom of the three-phase tank is connected to the pump inlet of the discharge screw pump through a pipe and a flange. The pump outlet of the discharge screw pump is connected to the return valve and the discharge valve through a tee and a flange. The return valve is connected to the return port of the side wall of the three-phase tank through a pipe and a flange. The discharge valve is connected to the outside of the system. The tank body liquid level meter is connected to the side wall of the three-phase tank through a flange. The industrial monitoring and the tank body pressure transmitter are fixed to the top center of the three-phase tank through a flange. The steam recompression device comprises a three-phase tank, a steam mixer, a vortex tube, a superheating chamber, a hot end pressure transmitter, a hot end temperature transmitter, an ejector, a steam-water separator, an overpressure valve, a Roots compressor, a cold end working manual valve, a cold end exhaust manual valve and connecting pipes. The exhaust port on the top of the three-phase tank is connected to the suction port of the ejector through pipes and flanges, the exhaust port of the ejector is connected to the air inlet on the top of the steam-water separator through pipes and flanges, the exhaust port on the top of the steam-water separator is connected to the air inlet of the Roots compressor and the overpressure valve through pipes and flanges in a three-way connection. The overpressure valve is connected to the outside of the system for exhaust. The outlet of the Roots compressor is connected to the inlet of the vortex tube through a pipe row. The hot end outlet of the vortex tube is connected to the superheat chamber through the pipe row. The superheat chamber is connected to the inlet of the steam mixer through a pipe and a flange. The cold end outlet of the vortex tube is connected to the working flow inlet of the ejector through a pipe row. There is a cold end working manual valve between the cold end of the vortex tube and the ejector. A cold end exhaust manual valve is arranged upstream of the cold end working manual valve through a three-way valve to connect to the atmosphere. The hot end pressure transmitter and the hot end temperature transmitter are fixed to the superheat chamber through threads.

2. The vortex tube steam recompression device according to claim 1, characterized in that: The condensate device comprises a plate heat exchanger, a steam-water separation tank, a condensate pump, a circulating water control valve, a heating water inlet thermometer, a heating water outlet thermometer, a liquid level control valve, a distribution plate and connecting pipes. The drain outlet of the steam-water separation tank is connected to the pump inlet of the condensate pump through pipes and flanges, the pump outlet of the condensate pump is connected to the circulating water control valve through pipes and flanges, the circulating water control valve is connected to the water inlet of the plate heat exchanger through pipes and flanges, the water outlet of the plate heat exchanger is connected to the return water port of the steam-water separation tank and the liquid level control valve through pipes and flanges in a three-way connection, the heating water inlet thermometer and the heating water outlet thermometer are respectively fixed to the inlet and outlet pipes of the plate heat exchanger by threads, the liquid level control valve is connected to the outside of the system, the return water port of the steam-water separation tank is connected to the distribution plate by a flange, and the distribution plate is fixed to the lower side of the interior of the steam-water separation tank by a bracket.

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