A flash steam recompression resource utilization device

Abstract

The present invention relates to the technical field of waste steam and condensate waste heat recovery, and particularly refers to a flash steam recompression resource utilization device, which includes a heat exchanger, a flash tank, a steam compressor, a buffer tank, and a boiler system connected by pipelines. The flash tank is used to collect the condensate and part of the steam generated by the heat exchanger during the production process or the waste steam in the production process. The flash tank is connected to the steam trap in the heat exchanger through a first pipeline. The flash tank is also connected to the steam compressor, and the steam compressor is connected to the heat exchanger through the buffer tank. The flash tank is also connected to the boiler system. By flashing the high-temperature and high-pressure condensate and part of the steam from the heat exchanger in the flash tank, the effect of recovering part of the waste heat of the flash steam and condensate is achieved, the energy utilization rate during the flashing process is provided, and the problems existing in the prior art are solved, that is, the flash steam is directly discharged, the heat cannot be efficiently utilized, and the energy utilization efficiency is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of waste steam and condensate waste heat recovery, and particularly refers to a flash steam recompression resource utilization device. Background Art

[0002] Steam can be used for heating or drying in industrial production processes, and there are two application methods in the production process: direct mixing and indirect heating. For the direct utilization of steam, such as directly heating hot water with steam, the steam condenses and becomes part of the hot water. In this way, the heat of the steam has been fully utilized.

[0003] For the indirect heating condition using a shell-and-tube heat exchanger, the heat exchanger is generally basically equipped with a steam trap. On the one hand, it can effectively prevent the steam from being discharged before condensation, resulting in a large amount of energy loss. On the other hand, it can automatically discharge when the condensate reaches a certain amount, effectively preventing the heat exchange effect from being affected due to the large amount of condensate occupying a large space.

[0004] In the prior art, for the steam in the distillation or drying process, generally, primary steam is used to exchange heat through a shell-and-tube heat exchanger, and through condensation heat release, the evaporation effect of the moisture in the material is achieved, thereby completing the distillation or drying process. In this process, although the drying of the material is achieved, part of the waste heat of the flash steam and condensate is not recovered, resulting in not only low energy utilization rate in the whole process, but also partial loss of steam.

[0005] According to different heating or drying processes, the process temperature is different. Under normal circumstances, when the heating temperature required by the process is higher than 100 °C, the steam pressure in the shell-and-tube heat exchanger is higher than the atmospheric pressure. That is to say, the condensate discharged from the shell-and-tube heat exchanger through the steam trap is high-pressure condensate, and the corresponding temperature is also high. A large amount of flash steam can be generated after the steam condensate discharged from the steam trap is depressurized and can be recycled.

[0006] If the flash steam is directly discharged, it will cause waste of heat and waste of production cost. The higher the pressure, the more flash steam appears during the flash process. If a vacuum occurs in the condensate tank, the amount of flash steam generated will be more according to the different vacuum degrees.

[0007] It can be seen that the prior art cannot solve the problems that the flash steam cannot be recovered, or although recovered, it cannot be efficiently utilized, and for the process that needs to be cooled during the production process, when water is used as the coolant, when the temperature of the cooling process is high, waste steam will be generated. These waste steams contain a large amount of latent heat, but because the temperature or pressure cannot meet the production requirements, they can only be discharged. Summary of the Invention

[0008] The object of the present invention is to solve the problems existing in the prior art, namely, the flash steam is directly discharged, the waste steam carrying a large amount of heat is discharged during the production process, the heat cannot be efficiently utilized, and the energy utilization efficiency is reduced. The present invention provides a flash steam recompression resource utilization device.

[0009] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0010] A flash steam recompression resource utilization device includes a heat exchanger, a flash tank, a steam compressor, a buffer tank and a boiler system connected by pipelines.

[0011] The flash tank is used to collect the condensate water and part of the steam generated by the heat exchanger during the production process or the waste steam in the production process; the flash tank is connected to the steam trap in the heat exchanger through a first pipeline; the flash tank is also connected to the steam compressor, and the steam compressor is connected to the heat exchanger through the buffer tank; the flash tank is also connected to the boiler system.

[0012] The waste steam and high-temperature and high-pressure condensate water from the heat exchanger flow to the flash tank through the steam trap for flashing. The flashed steam enters the steam compressor from the flash tank for compression. After compression, the temperature and pressure of the flashed steam increase, enter the buffer tank, and enter the heat exchanger from the buffer tank; the saturated water after flashing enters the boiler system.

[0013] As an improvement of the technical solution of the flash steam recompression resource utilization device of the present invention, the flash steam recompression resource utilization device further includes a high-temperature pump.

[0014] The high-temperature pump is connected to the lower part of the flash tank, and the flash tank is connected to the deaerator in the boiler system through the high-temperature pump.

[0015] Part of the saturated water generated after flashing flows to the deaerator through the high-temperature pump.

[0016] As an improvement of the technical solution of the flash steam recompression resource utilization device of the present invention, the water outlet end of the high-temperature pump is also connected to the flash tank to form a flash internal circulation.

[0017] Another part of the saturated water generated after flashing flows back to the flash tank through the high-temperature pump for re-flashing, ensuring that the waste heat of the condensate water is fully converted into flash steam and recovered.

[0018] As an improvement of the technical solution of the flash steam recompression resource utilization device of the present invention, the flash tank is directly connected to the deaerator of the boiler system.

[0019] As an improvement to the technical solution of the flash steam recompression resource utilization device of the present invention, the steam trap is connected to the deaerator of the boiler system through a second pipeline, a bypass valve is provided on the second pipeline, and the second pipeline and the first pipeline are bypassed with each other.

[0020] As an improvement to the technical solution of the flash steam recompression resource utilization device of the present invention, a minimum pressure steam valve and a buffer tank pressure sensor are provided on the buffer tank, and a buffer tank preset pressure value is preset in the buffer tank pressure sensor;

[0021] When the pressure in the buffer tank is lower than the buffer tank preset pressure value, the minimum pressure steam valve remains closed; when the pressure in the buffer tank is higher than the buffer tank preset pressure value, the minimum pressure steam valve opens.

[0022] As an improvement to the technical solution of the flash steam recompression resource utilization device of the present invention, a flash tank pressure sensor is provided in the flash tank, a frequency converter is provided in the steam compressor, and the frequency converter is connected to the pressure sensor.

[0023] As an improvement to the technical solution of the flash steam recompression resource utilization device of the present invention, a safety valve, a pressure gauge, a manual valve and an electric valve are provided on the flash tank.

[0024] As an improvement to the technical solution of the flash steam recompression resource utilization device of the present invention, a filtration system is further connected between the steam trap and the flash tank.

[0025] As an improvement to the technical solution of the flash steam recompression resource utilization device of the present invention, the steam compressor is a star-wheel wear-free long-life single-screw steam compressor, which includes a rotor system, a star-wheel system, a cooling and lubrication system and a control system;

[0026] The rotor system includes a screw, and screw threads are provided on the screw; the star-wheel system includes two centrally symmetric planar star-wheels, each of the planar star-wheels includes a star-wheel frame, star-wheel blades are covered on the star-wheel frame, the star-wheel blades and the screw threads form a first meshing pair, and the star-wheel blades are made of non-metallic materials;

[0027] An auxiliary screw groove is provided in the screw thread groove. The star wheel piece includes a first star wheel piece and an auxiliary star wheel piece which form an integral body. One end of the first star wheel piece is fixed on the star wheel frame. During operation, the first star wheel piece contacts the screw thread groove. The auxiliary star wheel piece is provided at the top end of the star wheel frame that contacts the bottom of the screw thread groove. The auxiliary star wheel piece moves in the auxiliary screw groove, and the auxiliary star wheel piece and the auxiliary screw groove form an auxiliary boosting meshing pair.

[0028] Advantages of the present invention:

[0029] In the present invention, high-temperature and high-pressure condensate water and partial steam from a heat exchanger or waste steam in a production process are flashed by a flash tank. The flashed steam enters the steam compressor from the flash tank for compression. The compressed flashed steam enters the buffer tank and then enters the heat exchanger from the buffer tank. The saturated water after flashing enters the boiler system, achieving the effect of recovering partial waste heat of the flashed steam and condensate water, improving the energy utilization rate during the flashing process, and solving the problems existing in the prior art, that is, the flashed steam is directly discharged, the heat cannot be efficiently utilized, and the energy utilization efficiency is reduced. Description of the drawings

[0030] Figure 1 is a structural schematic diagram of the present invention;

[0031] Figure 2 is a top view structural schematic diagram of the auxiliary screw groove of the compressor in the present invention;

[0032] Figure 3 is a front view structural schematic diagram of the auxiliary screw groove of the compressor in the present invention;

[0033] Figure 4 is a front view structural schematic diagram of the planar star wheel of the compressor in the present invention.

[0034] Description of reference numerals: 1 – steam compressor; 2 - heat exchanger; 3 - steam trap; 4 - flash tank; 5 - buffer tank; 6 - deaerator; 7 - first pipeline; 8 - high-temperature pump; 9 - second pipeline; 10 - star wheel frame; 11 - first star wheel piece; 12 - auxiliary star wheel piece; 13 - auxiliary screw groove. Detailed embodiments

[0035] To make the invention purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0036] Such as Figure 1As shown in the figure, a flash steam recompression resource utilization device includes a heat exchanger 2, a flash tank 4, a steam compressor 1, a buffer tank 5, and a boiler system connected by pipelines. The flash tank 4 is used to collect the condensate and part of the steam generated by the heat exchanger 2 during the production process or the waste steam in the production process. The flash tank 4 is connected to the steam trap 3 in the heat exchanger 2 through a first pipeline 7; the flash tank 4 is also connected to the steam compressor 1, and the steam compressor 1 is connected to the heat exchanger 2 through the buffer tank 5; the flash tank 4 is also connected to the boiler system.

[0037] During use, the steam and high-temperature and high-pressure condensate from the heat exchanger 2 flow through the steam trap 3 into the flash tank 4 for flashing. The flashed steam after flashing enters the steam compressor 1 from the flash tank 4 for compression. The compressed flashed steam enters the buffer tank 5 and then enters the heat exchanger 2 from the buffer tank 5; the saturated water after flashing enters the boiler system. In the present invention, the saturated solution is saturated water. In the present invention, compressed steam with different boost ratios can also be designed and produced according to the requirements of the steam pressure in the production process.

[0038] Specifically, the steam and high-temperature and high-pressure condensate generated by the heat exchanger 2 pass through the steam trap 3 and enter the flash tank 4 through the first pipeline 7 for flashing. Under the action of the steam compressor 1, the pressure inside the flash tank 4 becomes lower, enabling the flashing effect inside the flash tank 4. The flashed steam generated after flashing enters the steam compressor 1 for near-adiabatic compression to increase the temperature and pressure. The compressed flashed steam enters the buffer tank 5 from the steam compressor 1, and then through steam-water separation, the saturated steam enters the heat exchanger 2, allowing the steam to enter the heat exchanger 2 with a certain amount of heat, providing the original heat for heat exchange, and fully utilizing the heat to achieve the effect of resource utilization. At the same time, since the flashed steam after flashing enters the steam compressor 1 for compression, the effect of recompressing the flashed steam is achieved. By recompressing the flashed steam, the temperature and pressure of the flashed steam can be increased, further achieving the effect of heat recovery and full utilization of the flashed steam, and solving the problem in the prior art that the flashed steam is directly discharged, the heat cannot be efficiently utilized, and the energy utilization efficiency is reduced. The saturated water generated after flashing enters the boiler system after the temperature drops for repeated recycling.

[0039] The present invention completely recovers the waste heat of the condensate, maximally improves the energy utilization efficiency of the system, and the present invention occupies a small space, has a modular design, and is flexibly installed, which can solve the problem that the flashed steam cannot be recovered at present, or although it is recovered, it cannot be efficiently utilized.

[0040] Preferably, a minimum pressure steam valve and a buffer tank pressure sensor are provided on the buffer tank 5, and a preset pressure value of the buffer tank is preset in the buffer tank pressure sensor; when the pressure in the buffer tank 5 is lower than the preset pressure value of the buffer tank, the minimum pressure steam valve remains closed; when the pressure in the buffer tank 5 is higher than the preset pressure value of the buffer tank, the minimum pressure steam valve opens.

[0041] The flash steam recompression resource utilization device further includes a high-temperature pump 8. The high-temperature pump 8 is connected to the lower part of the flash tank 4, and the flash tank 4 is connected to the deaerator 6 in the boiler system through the high-temperature pump 8. A part of the saturated water generated after flashing flows to the deaerator 6 through the high-temperature pump 8.

[0042] Furthermore, the water outlet end of the high-temperature pump 8 is also connected to the flash tank 4. The flash tank 4 and the high-temperature pump 8 form an internal flash cycle to ensure full recovery of the waste heat of the condensed water. Another part of the saturated solution generated after flashing flows back to the flash tank 4 through the high-temperature pump 8, enabling multiple flashes of the flash steam and fully recovering the waste heat of the condensed water, further achieving the effect of efficient heat energy utilization.

[0043] Specifically, since flashing is the phenomenon that high-pressure saturated liquid enters a container with a relatively lower pressure, and due to the sudden drop in pressure, these saturated liquids become a part of the saturated steam and saturated liquid under the container pressure. That is, flashing will generate saturated solution and saturated steam. The saturated steam flows to the steam compressor 1 for compression, while the saturated solution is pressurized by the high-temperature pump 8. One part flows to the deaerator 6 of the boiler and serves as a part of the boiler feed water; the other part, due to the formation of a cyclic flash between the flash tank 4 and the high-temperature pump 8, the saturated solution flows back to the flash tank 4 for cyclic flashing to ensure that the waste heat carried by the condensed water in the cyclic flashing is fully flashed into steam.

[0044] Furthermore, the flow rates of the two parts of the saturated solution after the high-temperature pump 8 are fixed after being manually adjusted, achieving the effect of manually adjusting and controlling the amount of water entering the cyclic flashing of the flash tank 4 and the amount of water entering the deaerator 6.

[0045] Preferably, the heat exchanger 2 is also connected to the deaerator 6 through a steam trap 3. The water coming out of the heat exchanger 2 can directly enter the deaerator 6 through the steam trap 3 and serve as a part of the boiler feed water, which can reduce the steam entering the flash tank 4, thereby reducing the energy utilization in the flash tank 4 and further improving the energy utilization efficiency.

[0046] More preferably, a pressure sensor is provided inside the flash tank 4, and a frequency converter is provided inside the steam compressor 1. The frequency converter is connected to the pressure sensor. Before use, a preset pressure value is preset in the pressure sensor. During use, when the pressure in the flash tank 4 is higher than or equal to the preset pressure value, a signal can be sent to the frequency converter through the pressure sensor, and the operation of the steam compressor 1 can be controlled through the frequency converter to achieve the effect of adjusting the pressure inside the flash tank 4.

[0047] Furthermore, a safety valve, a pressure gauge, a manual valve, and an electric valve are provided on the flash tank 4. On the premise of ensuring the safety of the users, the manual and / or automatic adjustment and control of the present invention can be achieved through the safety valve, the pressure gauge, the manual valve, and the electric valve.

[0048] The steam trap 3 is connected to the deaerator 6 through the second pipeline 9. A bypass valve is provided on the second pipeline 9. The second pipeline 9 and the first pipeline 7 are bypassed with each other. When the present invention needs to be maintained, the bypass valve can be opened to ensure the normal and stable use of the present invention.

[0049] In the present invention, the original steam trap 3 remains unchanged, and the flash tank 4 is directly connected to the deaerator 6.

[0050] A filtration system is connected between the steam trap 3 and the flash tank 4. Before the high-pressure condensate enters the flash tank 4, it needs to be filtered at the first stage to prevent solid particles from entering the flash tank 4.

[0051] Since the present invention can achieve the effect of automatically adjusting the pressure inside the flash tank 4, the usage mode can be selected according to the actual working conditions during use.

[0052] As the first working condition that the present invention can rely on, it can recover the waste heat of the condensate and has low operating costs. Under this working condition, the pressure inside the flash tank 4 is the highest, but the magnitude of the pressure does not affect the normal operation of the upstream heat exchanger 2. Since the steam trap 3 is bypassed in the present invention, the magnitude of the pressure inside the flash tank 4 does not affect the working condition of the steam trap 3.

[0053] If the present invention is directly connected behind the steam trap 3, when the pressure inside the flash tank 4 increases, the steam trap 3 will experience poor drainage; if the pressure inside the flash tank 4 further increases, the steam trap 3 will lose its function. Therefore, to ensure the normal operation of the present invention, the present invention is bypassed with the steam trap 3 and they can be used as backups for each other.

[0054] Taking the steam before the pressure inlet of the heat exchanger 2 being 0.6 MPa as an example for illustration, due to the resistance of the pipeline and the heat exchanger 2, the pressure of the condensed water at the outlet of the heat exchanger 2 is 0.4 MPa. If the drainage is directly carried out through the steam trap 3, the temperature of the final saturated water is 100 °C, and the part of the waste heat higher than this temperature is lost through the flashing method. In the present invention, when the condensed water with a pressure of 0.4 MPa enters the flash tank 4 for flashing, if the flashing pressure is controlled at 0.3 MPa for flash compression, the pressure boost ratio of the steam is 2. The present invention has a low operating load and less power consumption. The saturated water after flashing directly enters the boiler system through the high-temperature water pump, ensuring the full utilization of the waste heat.

[0055] As the second working condition that the present invention can be based on, the maximum recovery of the waste heat of the condensed water has a high operating cost. This working condition is mainly applicable to the working condition where the condensed water is not recovered into the boiler system. The pressure in the flash tank 4 is as low as possible. In this working condition, in order not to affect the normal operation of the heat exchanger 2, the steam trap 3 needs to be enabled to ensure the constant pressure in the heat exchanger 2.

[0056] Taking the steam before the pressure inlet of the heat exchanger 2 being 0.6 MPa as an example for illustration, due to the resistance of the pipeline and the heat exchanger 2, the pressure of the condensed water at the outlet of the heat exchanger 2 is 0.4 MPa. If the drainage is directly carried out through the steam trap 3, the temperature of the final saturated water is 100 °C, and the part of the waste heat higher than this temperature is lost through the flashing method. To maximize the recovery of the waste heat of the condensed water, vacuum flashing in the flash tank 4 can be achieved. In the present invention, when the condensed water with a pressure of 0.4 MPa enters the flash tank 4 for flashing, if the flashing pressure is controlled at 0.06 MPa for flash compression, the pressure boost ratio of the steam is relatively high. The present invention has a large operating load and more power consumption, but if it is lower than the cost of the steam generated by gas, there will be economic benefits.

[0057] In the present invention, after the high-pressure steam enters the heat exchanger 2, it undergoes heat exchange and condenses to release heat and becomes condensed water, and then is discharged through the steam trap 3 to ensure the normal operation of the heat exchange system. At the same time, under the action of the present invention, for the condensed water to return to the boiler system again, the valve before the steam trap 3 is closed, and the condensed water is directly injected into the flash tank 4. Since the pressure in the flash tank 4 is relatively high, the pressure and temperature of the steam after flashing are correspondingly high. In this working condition, the operating cost of the steam compressor 1 is relatively low and the power consumption is less. And the water after flashing enters the boiler through the deaerator 6 for recycling.

[0058] For the working conditions where it is difficult for the condensed water to return to the boiler, the waste heat of the condensed water should be fully recovered to improve the thermal efficiency of the present invention. Under such working conditions, the bypass valve is closed, and the valve at the front end of the steam trap 3 is opened to ensure that the condensed water of the heat exchanger 2 enters the flash tank 4 after passing through the steam trap 3. The flash tank 4 maintains a vacuum to achieve negative pressure flashing. Under such working conditions, the compression ratio is high, and the operation cost of the present invention is relatively high, but the overall benefit is good.

[0059] As Figures 2 to 4 shown, the steam compressor 1 is a star-wheel wear-free long-life single-screw steam compressor 1, which includes a rotor system, a star-wheel system, a cooling and lubrication system, and a control system. The rotor system includes a screw, and screw grooves are provided on the screw; the star-wheel system includes two centrally symmetric planar star-wheels, and a first meshing pair is formed by the two planar star-wheels and the screw grooves in the screw. Each planar star-wheel includes a star-wheel frame 10, and star-wheel vanes are provided on the star-wheel frame 10. During the working process, the star-wheel vanes are in contact with the screw grooves. The star-wheel vanes include a first star-wheel vane 11 and an auxiliary star-wheel vane 12 that form an integral body. One end of the first star-wheel vane 11 is fixed on the star-wheel frame 10, and the auxiliary star-wheel vane 12 is arranged at the top of the star-wheel frame 10 where the star-wheel vane is in contact with the bottom of the screw groove. An auxiliary screw groove 13 is provided in the screw groove, and the auxiliary star-wheel vane 12 moves in the auxiliary screw. The auxiliary screw groove 13 and the auxiliary star-wheel vane 12 form an auxiliary boosting meshing pair, and this auxiliary boosting meshing pair can reduce or even eliminate the action and friction of the rear side of the screw groove on the rear side of the star-wheel vane.

[0060] After the auxiliary boosting meshing pair is installed on the steam compressor 1, it can ensure that only contact is maintained between the star-wheel vanes and the screw grooves and ensure good sealing, but there is no driving or passive rotational relationship, which can extend the service life of the star-wheel vanes. At the same time, it can ensure the advantages of the single-screw steam compressor 1 and give full play to the advantages of the single-screw steam compressor 1 such as balanced force and long life. The pressure after the steam is compressed can reach a maximum boost ratio of 12 according to the requirements of the production process.

[0061] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Claims

1. A flash steam recompression resource utilization device, comprising a heat exchanger, a flash tank, a steam compressor, a buffer tank and a boiler system connected by pipelines, characterized in that the flash tank is used to collect the condensed water and part of the steam generated by the heat exchanger during the production process or the waste steam in the production process; the flash tank is connected to the steam trap in the heat exchanger through a first pipeline; the flash tank is also connected to the steam compressor, and the steam compressor is connected to the heat exchanger through the buffer tank; the flash tank is also connected to the boiler system; the waste steam and high-temperature and high-pressure condensed water from the heat exchanger flow through the steam trap into the flash tank for flashing, and the flashed steam enters the steam compressor from the flash tank for compression. After compression, the temperature and pressure of the flashed steam increase, enter the buffer tank, and enter the heat exchanger from the buffer tank; the saturated water after flashing enters the boiler system; the flash steam recompression resource utilization device further comprises a high-temperature pump; the high-temperature pump is connected to the lower part of the flash tank, and the flash tank is connected to the deaerator in the boiler system through the high-temperature pump; a part of the saturated water generated after flashing flows through the high-temperature pump to the deaerator; a filtration system is also connected between the steam trap and the flash tank; the steam compressor is a star-wheel wear-free long-life single-screw steam compressor, comprising a rotor system, a star-wheel system, a cooling and lubrication system and a control system; the rotor system comprises a screw, and screw threads are arranged on the screw; the star-wheel system comprises two centrally symmetric planar star-wheels, each planar star-wheel comprises a star-wheel frame, and star-wheel sheets are covered on the star-wheel frame. The star-wheel sheets and the screw threads form a first meshing pair, and the star-wheel sheets are made of non-metallic materials; auxiliary threads are arranged in the screw threads. The star-wheel sheets comprise a first star-wheel sheet and an auxiliary star-wheel sheet which form an integral body. One end of the first star-wheel sheet is fixed on the star-wheel frame. During operation, the first star-wheel sheet contacts the screw threads. The auxiliary star-wheel sheet is arranged at the top end of the star-wheel frame contacting the bottom of the screw threads. The auxiliary star-wheel sheet moves in the auxiliary threads, and the auxiliary star-wheel sheet and the auxiliary threads form an auxiliary boost meshing pair.

2. The flash steam recompression resource utilization device according to claim 1, wherein the water outlet end of the high-temperature pump is also connected to the flash tank to form a flash internal circulation; another part of the saturated water generated after flashing flows through the high-temperature pump back to the flash tank for re-flashing, ensuring that the waste heat of the condensed water is fully converted into flashed steam and recovered.

3. The flash steam recompression resource utilization device according to claim 2, wherein, the flash tank is directly connected to the deaerator of the boiler system.

4. The flash steam recompression resource utilization device according to claim 1, characterized in that, the steam trap is connected to the deaerator of the boiler system through a second pipeline, a bypass valve is arranged on the second pipeline, and the second pipeline and the first pipeline are mutually bypassed.

5. The flash steam recompression resource utilization device according to claim 1, characterized in that, a minimum pressure steam valve and a buffer tank pressure sensor are arranged on the buffer tank, and a buffer tank preset pressure value is preset in the buffer tank pressure sensor; When the pressure in the buffer tank is lower than the preset pressure value of the buffer tank, the lowest pressure steam valve remains closed; when the pressure in the buffer tank is higher than the preset pressure value of the buffer tank, the lowest pressure steam valve opens.

6. The flash steam recompression resource utilization device according to claim 1, wherein, A flash tank pressure sensor is provided in the flash tank, and a frequency converter is provided in the steam compressor. The frequency converter is connected to the pressure sensor.

7. The flash steam recompression resource utilization device according to claim 6, characterized in that, A safety valve, a pressure gauge, a manual valve, and an electric valve are provided on the flash tank.

Images