Evaporator and steam-water separation device thereof

Abstract

The present invention relates to an evaporator and a steam-water separation device thereof, wherein the steam-water separation device comprises a shell and an opening and closing mechanism arranged in the shell; the shell is provided with an air inlet and an air outlet, the air inlet is connected with the outlet of the evaporation separation device, the bottom of the shell is provided with a liquid collecting part, the liquid collecting part is connected with the evaporation separation device through a reflux pipe; the opening and closing mechanism comprises a sealing member and an action part, when the liquid level in the liquid collecting part reaches a preset height, the action part can act on the sealing member to block the air outlet. When encountering a working condition of drastic pressure fluctuation or insufficient height of the tank of a small evaporation separation device, a liquid level control system failure, etc., it is ensured that the liquid in the evaporation separator will not enter the lower heat exchanger or vacuum pump, so as to ensure the safe operation of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of evaporation equipment, and in particular to an evaporator and a steam-water separation device thereof. Background Art

[0002] The existing evaporator is to install a baffle or a baffle type, a cyclone type, or an adsorption type steam-water separation device at the outlet position or the outlet section pipeline in the evaporation separation device tank body, and cooperate with a reflux pipe to collect and block the droplets brought out by the steam and allow the liquid to reflux into the evaporation separation device, and the steam is discharged into the lower-level heat exchange device or condenser.

[0003] When encountering conditions of drastic pressure fluctuations or insufficient tank height of a small evaporation separation device, or a liquid level control system failure, the liquid level in the tank of the evaporation separation device changes dramatically and exceeds the separation capacity of a conventional steam-water separation device. The effectiveness of the steam-water separation device will be greatly reduced, and it will be unable to prevent the evaporating liquid from entering the lower-stage heat exchanger or vacuum pump, seriously affecting the safe operation of the equipment.

[0004] Therefore, when encountering conditions of drastic pressure fluctuations or insufficient tank height of the evaporation separation device, or failure of the liquid level control system, ensuring that the liquid in the evaporation separator does not enter the lower-stage heat exchanger or vacuum pump and ensuring the safe operation of the equipment are technical problems that technical personnel in this field need to solve. Summary of the invention

[0005] The object of the present invention is to provide an evaporator and a steam-water separation device thereof, which can ensure that the liquid in the evaporation separator will not enter the lower-stage heat exchanger or vacuum pump when encountering a working condition of drastic pressure fluctuation or insufficient tank height of a small evaporation separation device, a liquid level control system failure, etc., so as to ensure the safe operation of the equipment.

[0006] In order to solve the above technical problems, the present invention provides a steam-water separation device of an evaporator, which includes a shell and an opening and closing mechanism arranged in the shell; the shell is provided with an air inlet and an air outlet, the air inlet is connected with the outlet of the evaporation separation device, and the bottom of the shell is provided with a liquid collecting part, and the liquid collecting part is connected with the evaporation separation device through a reflux pipe; the opening and closing mechanism includes a sealing member and an action part, and when the liquid level in the liquid collecting part reaches a preset height, the action part can act on the sealing member to block the air outlet.

[0007] When the evaporator is in normal working condition, the seal is separated from the gas outlet. After the water vapor flowing out of the outlet of the evaporation separation device enters the shell along the air inlet, the steam can flow out along the gas outlet, while the evaporation liquid falls along the wall surface inside the shell to the liquid collecting part and flows back to the evaporation separation device along the reflux pipe. When the pressure fluctuates violently or the tank height of the evaporation separation device is insufficient, the liquid level control system fails, etc., the water vapor flowing out of the outlet of the evaporation separation device contains a large amount of evaporation liquid. At this time, the flow rate of the evaporation liquid entering the steam-water separation device is too large, so that the reflux pipe cannot flow back in time, and the liquid level in the liquid collecting part rises abnormally. When the liquid level reaches the preset height, the action part can act on the seal to block and close the gas outlet. At this time, neither the steam nor the evaporation liquid can flow out from the gas outlet, but can only flow back to the evaporation separation device along the reflux pipe. Such a setting can ensure that the evaporation liquid in the evaporation separator will not flow out along the gas outlet to the lower evaporator, effectively avoiding the occurrence of material leakage, thereby ensuring the safe operation of the equipment.

[0008] The steam-water separation device provided by the present invention can achieve the effect of preventing material from escaping by only adding a sealing member and an action part on the basis of the original steam-water separation device. It has a simple structure and low cost and is suitable for popularization and use.

[0009] Optionally, the action part includes a guide part one, a guide part two and a float fixed at the bottom end of the guide part one, the seal is fixed to the guide part one, the guide part two is fixed to the shell, and the guide part one can move relative to the guide part two; the rise of the liquid level in the liquid collection part can push the guide part one to move along the guide part two through the float, and drive the seal to rise to block the air outlet.

[0010] Optionally, an isolation chamber connected to the air outlet is further provided in the air outlet chamber, and an opening adapted to the sealing member is provided on the bottom wall of the isolation chamber, and the guide part one moves along the guide part two to drive the sealing member to open and close the opening.

[0011] Optionally, a baffle is further provided in the shell and is arranged opposite to the air inlet.

[0012] Optionally, the baffle forms a side wall of the isolation cavity.

[0013] Optionally, the baffle separates the inner cavity of the shell into an air inlet cavity and an air outlet cavity which are connected at the bottom, the air inlet cavity is connected to the air inlet, and the air outlet cavity is connected to the air outlet; it also includes a partition plate arranged in the air outlet cavity, the partition plate and the baffle plate separate the upper part of the air outlet cavity to form the isolation cavity, and the opening is arranged on the partition plate.

[0014] Optionally, the second guide part is two spaced-apart brackets provided on the inner wall of the shell, each of the brackets is provided with a guide hole, and the first guide part is a guide rod that can slide axially along the guide hole.

[0015] Optionally, the reflux pipe is arranged obliquely, and one end of the reflux pipe facing the liquid collecting portion is higher than the end facing the evaporation separation device, and the reflux pipe is provided with a check valve.

[0016] In addition, the present invention also provides an evaporator, which includes a circulation pump, a heat exchanger, an evaporation separation device and the steam-water separation device as described above, the heat exchanger and the evaporation separation device are connected through a circulation pipeline, and the circulation pump is arranged in the circulation pipeline and provides circulation power.

[0017] The technical effect of the evaporator having the steam-water separation device as described above is similar to the technical effect of the steam-water separation device described above, and will not be described in detail here to save space.

[0018] Optionally, a defoaming portion is further provided on the side of the evaporation separation device facing the outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of an evaporator provided in an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 Schematic diagram of the structure of the steam-water separation device.

[0021] Attached Figure 1-2 In the figure, the reference numerals are described as follows:

[0022] 10-steam-water separation device; 20-circulation pump; 30-heat exchanger; 40-evaporation separation device, 41-export; 50-foam removal unit; 60-circulation pipeline;

[0023] 1-shell, 11-air inlet, 12-air outlet, 13-liquid collecting part, 14-air inlet chamber, 15-air outlet chamber, 16-isolating chamber, 17-opening; 2-sealing member; 3-acting part, 31-guide part 1, 32-guide part 2, 33-floating ball; 4-reflux pipe; 5-check valve; 6-baffle; 7-partition. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Please refer to Figure 1-2 , Figure 1 is a schematic structural diagram of an evaporator provided in an embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the structure of the steam-water separation device.

[0026] The embodiment of the present invention provides an evaporator and a steam-water separation device 10 thereof, wherein: Figure 1 As shown, the evaporator includes a circulation pump 20, a heat exchanger 30, an evaporation separation device 40 and a steam-water separation device 10. The heat exchanger 30 and the evaporation separation device 40 are connected through a circulation pipeline 60 to form a circulation water circuit. The circulation pump 20 is connected to the circulation pipeline 60 and can provide circulation power, so that the working fluid solution (slurry) in the evaporation separation device 40 enters the heat exchanger 30 along the circulation pipeline 60 to be heated and then returns to the evaporation separation device 40 along the circulation pipeline 60. This circulation heating process continues, so that the temperature of the working fluid solution in the evaporation separation device 40 increases or even boils, and the steam will enter the above-mentioned steam-water separation device 10 along the outlet 41 of the evaporation separation device 40, and finally the working fluid solution in the evaporation separation device 40 is concentrated by evaporation, which is conducive to recycling or discharge treatment.

[0027] Specifically, Figure 2 As shown, the steam-water separation device 10 includes a shell 1 and an opening and closing mechanism arranged in the shell 1, wherein the shell 1 is provided with an air inlet 11 and an air outlet 12, the air inlet 11 is connected to the outlet 41 of the evaporation separation device 40, and a liquid collecting portion 13 is provided at the bottom of the shell 1, and the liquid collecting portion 13 is connected to the evaporation separation device 40 through the reflux pipe 4, that is, the water vapor (containing steam and evaporation liquid) flowing out of the outlet 41 of the evaporation separation device 40 will enter the shell 1 along the air inlet 11, and the steam in the shell 1 will flow out along the air outlet 12 and enter the heat exchanger 30 of the lower evaporator as a heat source or condense into clean water in the condenser for recovery, and the evaporation liquid will fall into the liquid collecting portion 13 along the wall surface in the shell 1 and reflux to the evaporation separation device 40 along the reflux pipe 4 to participate in heating and evaporation again.

[0028] The opening and closing mechanism includes a sealing member 2 and an action part 3, wherein the action part 3 can act on the sealing member 2 to make it cooperate with or disengage from the air outlet 12 to achieve the closing or opening of the air outlet 12. Specifically, when the liquid level in the liquid collecting part 13 reaches a preset height, the action part 3 can act on the sealing member to move it to the air outlet 12 to cooperate with and block the air outlet 12. At this time, the steam in the shell 1 cannot flow out along the air outlet 12.

[0029] In detail, when the evaporator is in normal working condition, the seal 2 is separated from the air outlet 12, and the water vapor flowing out of the outlet 41 of the evaporation separation device 40 enters the shell 1 along the air inlet 11, and the steam can flow out along the air outlet 12, while the evaporation liquid falls along the wall surface inside the shell 1 to the liquid collecting part 13 and flows back to the evaporation separation device 40 along the reflux pipe 4. When the pressure fluctuates violently or the tank height of the evaporation separation device 40 is insufficient, the liquid level control system fails, etc., the water vapor flowing out of the outlet 41 of the evaporation separation device 40 contains a large amount of evaporation liquid. At this time, When the evaporative liquid flow rate entering the steam-water separation device 10 is too large and the reflux pipe 4 has no time to reflux, the liquid level in the liquid collecting part 13 rises abnormally. When the liquid level reaches the preset height, the action part 3 can act on the sealing member 2 to block and close the gas outlet 12. At this time, neither the steam nor the evaporative liquid can flow out from the gas outlet 12, but can only flow back to the evaporative separation device 40 along the reflux pipe 4. Such an arrangement can ensure that the evaporative liquid in the evaporative separator will not flow out to the lower evaporator along the gas outlet 12, effectively avoiding the occurrence of material leakage, thereby ensuring the safe operation of the equipment.

[0030] Specifically, the present embodiment does not impose any specific limitation on the preset height, and the preset height may be set according to the height of the housing 1 , the position of the air outlet 12 , the size of the liquid collecting portion 13 , and other conditions.

[0031] In this embodiment, on the basis of the original steam-water separation device 10, the effect of preventing material from escaping can be achieved by simply adding a sealing member 2 and an action part 3. It has a simple structure and low cost, and is suitable for popularization and use.

[0032] In the above embodiment, if Figure 2 As shown, the action part 3 includes a guide part 1 31, a guide part 2 32 and a float 33 fixed at the bottom end of the guide part 31, the seal 2 is fixed to the guide part 31, the guide part 2 32 is fixed to the shell 1, the guide part 1 31 can move relative to the guide part 2 32, and the rise and fall of the liquid level in the liquid collecting part 13 can push the guide part 31 to move along the guide part 2 32 through the float 33, and drive the seal 2 to open and close the air outlet 12. When the evaporator fails and causes the liquid level in the liquid collecting part 13 to rise to a preset height, the float 33 will rise with the rise of the liquid level until the guide part 31 moves along the guide part 32 and drives the seal 2 to move to block the air outlet 12. At this time, the air outlet 12 is in a closed state. Since the pipeline connecting the air outlet 12 to the next-stage evaporator or condenser is in a negative pressure state, the sealing performance of the seal 2 is more stable, ensuring that the sealing effect of the seal 2 cannot be released before the fault is eliminated, effectively preventing the occurrence of material leakage. After the fault is eliminated, the negative pressure state can be adjusted to make the seal 2 and the guide part 31 fall with the float 33 under the action of gravity, thereby restoring the normal operation of the steam-water separation device 10.

[0033] Alternatively, in this embodiment, the action part 3 can also be configured to include a liquid level switch and a driving member. When the liquid level in the liquid collecting part 13 reaches a preset height, the liquid level switch is triggered, and the driving member drives the sealing member 2 to block the air outlet 12 so that the air outlet 12 is in a closed state. When the liquid level switch is closed, the driving action of the driving member is no longer there, and the sealing member 2 can be separated from the air outlet 12. When the action part 3 is configured to include a structure including a guide part 1 31, a guide part 2 32, and a float 33, the action part 3 utilizes the buoyancy effect of the liquid level in the liquid collecting part 13 on the float 33, without the need for power or external driving force, and due to the guiding effect between the guide part 1 31 and the guide part 2 32, it is ensured that the sealing member 2 can block the air outlet 12 after rising, and the opening and closing of the air outlet 12 is achieved only through the physical structure, and the structure is stable, the effect is good, and it is energy-saving, environmentally friendly, and economical.

[0034] In the above embodiment, an isolation chamber 16 communicating with the air outlet 12 is further provided in the air outlet chamber 15, and an opening 17 matching with the seal 2 is provided on the bottom wall of the isolation chamber 16, and the first guide portion 31 moves along the second guide portion 32 to drive the seal 2 to engage with or disengage from the opening 17. In this arrangement, the seal 2 does not directly engage with the air outlet 12, but engages with the opening 17 provided on the bottom wall of the isolation chamber 16, so that the design requirements and manufacturing process of the seal 2 can be simplified, and the sealing effect of the seal 2 on the air outlet 12 can be ensured.

[0035] In the above embodiment, the housing 1 is further provided with a baffle 6 arranged opposite to the air inlet 11, and the water vapor flowing out of the outlet 41 of the evaporation separation device 40 can be directly blown toward the baffle 6 after entering the housing 1, so that the liquid droplets contained in the water vapor fall along the baffle 6 into the liquid collecting portion 13, and the liquid droplets in the water vapor are prevented from being discharged from the air outlet 12 together with the steam. Alternatively, in this embodiment, the air inlet 11 can also be arranged to be opposite to the inner wall of the housing 1, and the liquid droplets entering the housing 1 from the air inlet 11 will fall along the inner wall of the housing 1, and the arrangement of the baffle 6 can simplify the structure of the housing 1, and facilitate the design and manufacturing process.

[0036] Furthermore, the baffle plate 6 forms a side wall of the isolation chamber 16, that is, the baffle plate 6 and the isolation chamber 16 are an integrated structure, which can simplify the overall structure of the steam-water separation device 10 and facilitate the arrangement of the internal structure and assembly operations.

[0037] Furthermore, the baffle 6 divides the inner cavity of the shell 1 into an air inlet cavity 14 and an air outlet cavity 15, wherein the bottom of the air inlet cavity 14 and the bottom of the air outlet cavity 15 are connected, the air inlet cavity 14 is connected to the air inlet 11, and the air outlet cavity 15 is connected to the air outlet 12. The steam-water separation device 10 also includes a baffle 7 arranged in the air outlet cavity 15, and the baffle 7 and the baffle 6 can separate the upper part of the air outlet cavity 15 to form the above-mentioned isolation cavity 16, and the above-mentioned opening 17 is arranged in the isolation cavity 16. The water vapor entering the air inlet cavity 14 from the air inlet 11 is directly blown toward the baffle 6, and the droplets will fall into the liquid collecting part 13 along the baffle 6, while the steam will flow from the bottom of the air inlet cavity 14 to the air outlet cavity 15, and enter the isolation cavity 16 along the opening 17 and then be discharged through the air outlet 12.

[0038] Alternatively, in the present embodiment, the isolation chamber 16 can also be provided as a separate box body, the bottom wall of which is provided with the above-mentioned opening 17, the baffle 6 can be a side wall of the box body, and the box body as a whole can be fixed to the shell 1, and in the scheme of the above-mentioned baffle 6 and partition 7, only the baffle 6 arranged along the longitudinal direction and the partition 7 arranged along the transverse direction are provided in the shell 1 of the steam-water separation device 10, so that the steam and droplets in the water vapor can be separated, and at the same time, the sealing effect of the seal 2 can be achieved, which has a simple structure and good economy.

[0039] In the above embodiment, the second guide part 32 is two spaced brackets arranged on the side wall of the housing 1, each bracket is provided with a guide hole, and the first guide part 31 is a guide rod that can slide along the axial direction of the guide hole. Alternatively, the second guide part 32 can also be set as a slideway (such as a slide rail or a slide groove) arranged on the inner wall of the housing 1, and the second guide part 32 can be set as a structure with a slider that can slide along the slideway, and the first guide part 31 can also be moved along a predetermined direction relative to the second guide part 32. The scheme that the first guide part 31 is set as a guide rod, the second guide part 32 is set as two spaced brackets, and the brackets are provided with guide holes that match the guide rods can simplify the overall structure and facilitate the processing technology.

[0040] In the above embodiment, the reflux pipe 4 is tilted, and the end of the reflux pipe 4 facing the liquid collecting part 13 is higher than the end facing the evaporation separation device 40. The reflux pipe 4 is provided with a check valve 5, which is a one-way valve. The evaporated liquid in the liquid collecting part 13 can flow back to the evaporation separation device 40 along the reflux pipe 4, while the evaporated liquid in the evaporation separation device 40 cannot flow into the liquid collecting part 13 along the reflux pipe 4. Alternatively, in this embodiment, the reflux pipe 4 can also be set as a U-shaped pipe, and the end of the U-shaped pipe facing the liquid collecting part 13 is higher than the end facing the evaporation separation device 40, so that the evaporated liquid in the liquid collecting part 13 can flow back to the evaporation separation device 40 in one direction. When the reflux pipe 4 is set as an inclined structure and provided with a check valve 5, it can avoid the situation where the solids mixed in the working fluid solution are deposited in the U-shaped pipe and cause the reflux pipe 4 to be blocked.

[0041] In addition, in the present embodiment, a defoamer 50 is further provided on the side of the evaporation separation device 40 facing the outlet 41, which is used to intercept the droplets in the water vapor to reduce the outflow of the evaporating liquid. Specifically, the defoamer 50 can be one of a baffle defoamer, a wire mesh defoamer and a cyclone defoamer, or a combination of any two or three thereof, and no specific limitation is made here.

[0042] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An evaporator, characterized in that: The invention comprises a circulation pump (20), a heat exchanger (30), an evaporation separation device (40) and a steam-water separation device (10), wherein the heat exchanger (30) and the evaporation separation device (40) are connected via a circulation pipeline (60), and the circulation pump (20) is arranged in the circulation pipeline (60) and provides circulation power; The steam-water separation device (10) comprises a shell (1) and an opening and closing mechanism arranged in the shell (1); The shell (1) is provided with an air inlet (11) and an air outlet (12), the air inlet (11) is connected to an outlet (41) of an evaporation separation device (40), and a liquid collecting portion (13) is provided at the bottom of the shell (1), and the liquid collecting portion (13) is connected to the evaporation separation device (40) through a reflux pipe (4); The opening and closing mechanism comprises a sealing member (2) and an action part (3); when the liquid level in the liquid collecting part (13) reaches a preset height, the action part (3) can act on the sealing member (2) to block the air outlet (12); The action part (3) comprises a first guide part (31), a second guide part (32) and a floating ball (33) fixedly arranged at the bottom end of the first guide part (31); the sealing member (2) is fixedly arranged at the first guide part (31); the second guide part (32) is fixedly arranged at the housing (1); and the first guide part (31) is movable relative to the second guide part (32); The rise of the liquid level in the liquid collecting portion (13) can push the first guide portion (31) to move along the second guide portion (32) through the float (33), and drive the sealing element (2) to rise to block the air outlet (12); The housing (1) is further provided with an isolation chamber (16) in communication with the air outlet (12); the bottom wall of the isolation chamber (16) is provided with an opening (17) adapted to the sealing member (2); the first guide portion (31) moves along the second guide portion (32) to drive the sealing member (2) to open and close the opening (17).

2. The evaporator according to claim 1, characterized in that A baffle (6) is also provided in the housing (1) and is arranged opposite to the air inlet (11).

3. The evaporator according to claim 2, characterized in that The baffle (6) forms a side wall of the isolation chamber (16).

4. The evaporator according to claim 3, characterized in that The baffle (6) divides the inner cavity of the shell (1) into an air inlet cavity (14) and an air outlet cavity (15) which are arranged in communication at the bottom, the air inlet cavity (14) being in communication with the air inlet (11), and the air outlet cavity (15) being in communication with the air outlet (12); It also comprises a partition plate (7) arranged in the air outlet cavity (15), wherein the partition plate (7) and the baffle plate (6) separate the upper part of the air outlet cavity (15) to form the isolation cavity (16), and the opening (17) is arranged on the partition plate (7).

5. The evaporator according to any one of claims 1 to 4, characterized in that: The second guide part (32) is two spaced apart brackets arranged on the inner wall of the housing (1), each bracket is provided with a guide hole, and the first guide part (31) is a guide rod that can slide along the axial direction of the guide hole.

6. The evaporator according to any one of claims 1 to 4, characterized in that: The reflux pipe (4) is arranged obliquely, and one end of the reflux pipe (4) facing the liquid collecting portion (13) is higher than the other end facing the evaporation separation device (40), and the reflux pipe (4) is provided with a check valve (5).

7. The evaporator according to any one of claims 1 to 4, characterized in that: A defoaming portion (50) is also provided on the side of the evaporation separation device (40) facing the outlet (41).

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