Negative pressure evaporative condenser

Abstract

The utility model provides a negative pressure evaporative condenser which comprises a shell, a draught fan is arranged on the top of the shell, a condensation cooling module is arranged in the shell and comprises an evaporation heat exchange module and an air cooling heat exchange module, and a spraying pipe is arranged on the upper portion of the evaporation heat exchange module. Spraying water sprayed by the spraying pipe is used for cooling process gas in the evaporation heat exchange module, the input end of the evaporation heat exchange module is connected with a gas inlet pipe, the output end of the evaporation heat exchange module is connected with a liquid outlet pipe and a non-condensable gas conveying pipe, and the air cooling heat exchange module is located above the spraying pipe. The input end of the air cooling heat exchange module is connected with the evaporation heat exchange module through a non-condensable gas conveying pipe, the output end of the air cooling heat exchange module is connected with vacuumizing equipment, and air circulating in the shell cools and condenses non-condensable gas in the air cooling heat exchange module. On the premise of ensuring the cooling and condensing performance of the process gas, not only can water be saved, but also the fog dispersal effect can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of condensers.

[0002] Specifically, it relates to a negative pressure evaporative condenser. Background Art

[0003] Negative pressure evaporative condenser is a kind of equipment that absorbs the heat of the high-temperature gaseous process gas in the straight tube when the spray water outside the tube evaporates, so that the process gas in the tube is gradually cooled from gas to liquid. Therefore, the substance to be cooled in the negative pressure evaporative condenser needs to be transformed from gas to liquid, rather than simply cooling the liquid substance.

[0004] At present, negative pressure evaporative condensers all use light tube evaporation heat exchange. This type of equipment has the following shortcomings: first, saturated water vapor is formed after the spray water exchanges heat with the pipeline. When the saturated water vapor is discharged to the outside through the fan, white mist will be formed. Raindrops will form around it, corroding surrounding equipment and causing slippery and icy roads; second, the water consumption is high. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the above-mentioned traditional technology and provide a negative pressure evaporative condenser in view of the deficiencies of the prior art.

[0006] The objective of the utility model is achieved through the following technical measures: a negative pressure evaporative condenser comprises a shell, a fan is arranged on the top of the shell, a condensing and cooling module is arranged in the shell, the condensing and cooling module comprises an evaporative heat exchange module and an air-cooling heat exchange module, a spray pipe is arranged on the upper part of the evaporative heat exchange module, the spray water sprayed by the spray pipe is used to cool the process gas in the evaporative heat exchange module, the input end of the evaporative heat exchange module is connected with an air inlet pipe and the output end is connected with a liquid outlet pipe and a non-condensable gas delivery pipe, the air-cooling heat exchange module is located above the spray pipe, the input end of the air-cooling heat exchange module is connected to the evaporative heat exchange module through the non-condensable gas delivery pipe, the output end of the air-cooling heat exchange module is connected with a vacuum pumping device, and the air circulating in the shell cools down and condenses the non-condensable gas in the air-cooling heat exchange module.

[0007] As an improvement of the above technical solution: a water tank is provided under the shell, an air inlet louver is provided between the top end of the water tank side wall and the bottom end of the shell side wall, a water pump is provided outside the water tank, the input end of the water pump is connected to the bottom of the water tank, and an upper water pipe is connected between the output end of the water pump and the spray pipe.

[0008] As an improvement of the above technical solution: the evaporation heat exchange module includes a first tube sheet, a second tube sheet and a light pipe located between the first tube sheet and the second tube sheet, the input end of the light pipe is fixed on the first tube sheet and passes through the first tube sheet, the output end of the light pipe is fixed on the second tube sheet and passes through the second tube sheet, the first tube sheet is connected to a first end cap on the outside, a process gas inlet distribution area is formed between the first end cap and the first tube sheet, the inlet pipe is located in the middle of the first end cap, the second tube sheet is connected to a second end cap on the outside, a condensate and non-condensable gas distribution area is formed between the second end cap and the second tube sheet, the liquid outlet pipe is connected to the lower part of the second end cap, and the bottom end of the non-condensable gas delivery pipe is connected to the top of the second end cap.

[0009] As an improvement of the above technical solution: a water collector is provided in the inner cavity of the shell at a position above the spray pipe.

[0010] As an improvement of the above technical solution: the condensation zone is between the first tube sheet and the second tube sheet, the light pipe is located in the condensation zone, the process gas inlet distribution zone and the distribution zone of condensate and non-condensable gas are all located outside the shell, the condensation zone is located inside the shell, the spray pipe is located above the condensation zone and is provided with a plurality of nozzles corresponding to the light pipe.

[0011] As an improvement of the above technical solution: there are multiple light pipes arranged, and the multiple light pipes are staggered, the horizontal position of the light pipe input end is higher than the horizontal position of the output end, and the angle between the light pipe and the horizontal direction is ∠A, 2°<∠A<5°.

[0012] As an improvement of the above technical solution: the air-cooling heat exchange module is tilted as a whole, the horizontal position of the output end of the air-cooling heat exchange module is higher than the horizontal position of its input end, and the angle between the air-cooling heat exchange module and the horizontal direction is ∠B, 2°<∠B<5°.

[0013] As an improvement of the above technical solution: the air-cooling heat exchange module includes fin tubes and collecting pipes located at both ends of the fin tubes, the fin tubes are arranged in multiple rows, and both ends are collected by the collecting pipes, the collecting pipes corresponding to the output ends of the fin tubes are connected to the vacuum equipment, and the collecting pipes corresponding to the input ends of the fin tubes are connected to the top of the non-condensable gas delivery pipe.

[0014] As an improvement of the above technical solution: a plurality of the air-cooling heat exchange modules are provided, and the plurality of the air-cooling heat exchange modules are arranged in sequence along the horizontal direction.

[0015] Due to the adoption of the above technical scheme, compared with the prior art, the advantages of the utility model are: an air-cooling heat exchange module is arranged above the spray pipe, most of the process gas adopts spray water evaporation condensation heat exchange, and a small part of the non-condensable gas condensation adopts air-cooling heat exchange form, thereby achieving the effect of saving water and eliminating mist while ensuring the equipment's cooling and condensation performance of the process gas.

[0016] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the internal structure of the utility model as a whole;

[0018] Figure 2 It is a cross-sectional structural schematic diagram of the evaporation heat exchange module in the utility model;

[0019] Figure 3 This is a schematic diagram of the main structure of the hollow cold heat exchange module of the utility model;

[0020] Figure 4 It is a left-side structural schematic diagram of the utility model as a whole;

[0021] Figure 5 It is a right side structural schematic diagram of the utility model as a whole.

[0022] In the figure: 1- housing;

[0023] 2- fan;

[0024] 3-Evaporation heat exchange module;

[0025] 4- Air cooling heat exchange module;

[0026] 5-Spray pipe;

[0027] 6-Intake pipe;

[0028] 7-Liquid outlet pipe;

[0029] 8- non-condensable gas delivery pipe;

[0030] 9- Water tank;

[0031] 10- Water pump;

[0032] 11-Water supply pipe;

[0033] 12-nozzle;

[0034] 13- Air inlet shutters;

[0035] 14-Water collector;

[0036] 15-first tube sheet;

[0037] 16- second tube sheet;

[0038] 17-light pipe;

[0039] 18- first head;

[0040] 19- Second head;

[0041] 20- finned tube;

[0042] 21-Collecting duct. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0044] Embodiment 1: As attached Figure 1-3 As shown, a negative pressure evaporative condenser comprises a shell 1, a fan 2 is arranged on the top of the shell 1, so that there is air flowing from bottom to top in the shell 1, a condensation and cooling module is arranged in the shell 1, and the condensation and cooling module comprises an evaporation heat exchange module 3 and an air cooling heat exchange module 4, a spray pipe 5 is arranged on the upper part of the evaporation heat exchange module 3, and the spray water sprayed by the spray pipe 5 cools down the evaporation heat exchange module 3, and the input end of the evaporation heat exchange module 3 is connected to an air inlet pipe 6 and the output end is connected to a liquid outlet pipe 7. The gaseous process gas flows into the evaporation heat exchange module 3 from the air inlet pipe 6, and flows out from the liquid outlet pipe 7 after being evaporated and condensed into a liquid. The air cooling heat exchange module 4 is located above the spray pipe 5, and the input end of the air cooling heat exchange module 4 is connected to the evaporation heat exchange module 3 through a non-condensable gas conveying pipe 8, and the output end of the air cooling heat exchange module 4 is connected to a vacuum pumping device, and the non-condensable gas in the air cooling heat exchange module 4 is cooled and condensed by the air circulating in the shell 1.

[0045] The evaporative heat exchange module 3 condenses the incoming gaseous process gas. A water tank 9 is provided below the evaporative heat exchange module 3, and the spray pipe 5 and the water tank 9 are connected by an upper water pipe 11. A water pump 10 is provided outside the water tank 9, and the water pump 10 is connected to the upper water pipe 11. The spray pipe 5 is provided with a nozzle 12 facing the evaporative heat exchange module 3, and a plurality of nozzles 12 are provided, and the plurality of nozzles 12 are all provided directly above the evaporative heat exchange module 3. In this embodiment, the cooling water in the water tank 9 is pumped into the upper water pipe 11 by the water pump 10, and then sprayed out through the nozzle 12 through the spray pipe 5, and flows back into the water tank 9 after cooling the evaporative heat exchange module 3, completing the cycle. Furthermore, six nozzles 12 are provided along the length direction of the spray pipe 5, and other numbers can also be provided according to actual conditions. The six nozzles 12 are all located directly above the evaporative heat exchange module 3, so that the sprayed cooling water falls completely on the evaporative heat exchange module 3, thereby improving efficiency.

[0046] like Figure 1 As shown, an air inlet louver 13 is provided between the bottom end of the housing 1 and the top end of the water tank 9, that is, the air inlet louver 13 is located between the evaporative heat exchange module 3 and the water tank 9. Air is introduced through the air inlet louver 13, and the fan 2 extracts the water vapor and air generated by the cooling, so that air circulation from bottom to top is generated in the housing 1.

[0047] A water collector 14 is also provided inside the housing 1 and is located above the spray pipe 5. The water carried in the hot and humid air discharged from the housing 1 includes fine water droplets carried along with the airflow, which are captured by the water collector 14.

[0048] like Figure 1 As shown, the process gas that needs to be condensed enters the evaporative heat exchange module 3, and the nozzle 12 sprays spray water onto the surface of the light tube 17 to evaporate, so that the gaseous process gas is condensed into liquid in the evaporative heat exchange module 3, and the uncondensed gas is drawn into the air-cooled heat exchange module 4 along with the vacuum equipment, and the uncondensed process gas is further condensed, and the condensed water flows back into the output end of the evaporative heat exchange module 3, and the uncondensed air is drawn out of the equipment by the vacuum equipment.

[0049] like Figure 1-2As shown, the evaporation heat exchange module 3 includes a first tube sheet 15 and a second tube sheet 16 and a light tube 17 located between the first tube sheet 15 and the second tube sheet 16, the input end of the light tube 17 is fixed on the first tube sheet 15 and passes through the first tube sheet 15, the output end of the light tube 17 is fixed on the second tube sheet 16 and passes through the second tube sheet 16, the first tube sheet 15 is connected to a first end cap 18 on the outside, a process gas inlet distribution area is formed between the first end cap 18 and the first tube sheet 15, the inlet pipe 6 is located in the middle of the first end cap 18, the second tube sheet 16 is connected to a second end cap 19 on the outside, a condensate and non-condensable gas distribution area is formed between the second end cap 19 and the second tube sheet 16, the liquid outlet pipe 7 is connected to the lower part of the second end cap 19 to facilitate the outflow of condensate; the bottom end of the non-condensable gas conveying pipe 8 is connected to the top of the second end cap 19. The condensation area is between the first tube sheet 15 and the second tube sheet 16. The light tube 17 is located in the condensation area. The process gas inlet distribution area and the distribution area of ​​condensate and non-condensable gas are all located outside the shell 1. The condensation area is located inside the shell 1. The spray pipe 5 is located above the condensation area and is provided with multiple nozzles 12 corresponding to the light tube 17; that is, the nozzle 12 is only provided corresponding to the light tube 17, and the spray water is directly sprayed on the light tube 17 to condense the gaseous process gas. There are multiple light tubes 17, and the multiple light tubes 17 are arranged in a staggered manner. The horizontal position of the input end of the light tube 17 is higher than the horizontal position of its output end. The angle between the light tube 17 and the horizontal direction is ∠A, 2°<∠A<5°; it can make the liquid phase process gas condensed in the light tube 17 flow smoothly to the distribution area of ​​condensate and non-condensable gas, and the inclination angle is not too large to occupy too much space in the shell 1.

[0050] like Figure 1 As shown, in this embodiment, the air-cooling heat exchange module 4 is arranged between the fan 2 and the water collector 14, and the input end of the air-cooling heat exchange module 4 is connected to the output end of the evaporative heat exchange module 3 through the non-condensable gas delivery pipe 8, and the air-cooling heat exchange module 4 is connected to the vacuum equipment. The non-condensable gas delivery pipe 8 is connected to the distribution area of ​​the condensate and non-condensable gas of the evaporative heat exchange module 3, and the non-condensable gas delivery pipe 8 is located above the liquid outlet pipe 7. The air-cooling heat exchange module 4 is tilted as a whole, and the horizontal position of the output end of the air-cooling heat exchange module 4 is higher than the horizontal position of its input end, which is convenient for the outflow of the liquid after re-condensation. The angle between the air-cooling heat exchange module 4 and the horizontal direction is ∠B. In this embodiment, 2°<∠B<5°, which can make the liquid-phase process gas condensed in the air-cooling heat exchange module 4 flow smoothly to the non-condensable gas delivery pipe 8 corresponding to the end, and the tilt angle is not too large to occupy too much space in the shell 1.

[0051] like Figure 3As shown, in this embodiment, the air-cooling heat exchange module 4 includes a fin tube 20 and a collection pipe 21 located at both ends of the fin tube 20. The fin tube 20 is arranged in multiple rows, and both ends are collected by the collection pipe 21. The collection pipe 21 corresponding to the output end of the fin tube 20 is connected to the vacuum equipment, and the collection pipe 21 corresponding to the input end of the fin tube 20 is connected to the top of the non-condensable gas delivery pipe 8.

[0052] In this embodiment, the process gas is water vapor, and of course it can also be other liquids that vaporize when heated. The gaseous process gas entering the evaporative heat exchange module 3 is water vapor and non-condensable gas, that is, a large amount of water vapor and a small amount of air, which enters the process gas inlet distribution area of ​​the evaporative heat exchange module 3 from the air inlet pipe 6. The first tube sheet 15 of the evaporative heat exchange module 3 is connected to multiple light pipes 17. The gas enters the multiple light pipes 17 from the process gas inlet distribution area at the same time. The water pump 10 sends spray water into the spray pipe 5 located above the evaporative heat exchange module 3. The temperature of the spray water is basically the same as the external atmospheric temperature. The nozzle 12 sprays the spray water downward evenly on the surface of the light tube 17, forming a uniform water film outside the light tube 17. The water film evaporates and vaporizes continuously, absorbs the heat of the medium in the light tube 17, and condenses the medium in the light tube 17. The evaporation of the water film greatly increases the humidity of the air after passing through the light tube 17 bundle and approaches a saturated state. The fan 2 extracts the saturated wet air and passes it through the water collector 14 located above the spray pipe 5. After removing the water droplets entrained in the saturated wet air, most of the spray water, except for a small amount of vaporized water, falls back into the water tank 9 and is pressurized by the water pump 10 for recycling.

[0053] After the condensed water vapor and air pass through the light tube 17 bundle, most of the water vapor condenses into water and flows out from the liquid outlet pipe 7, and the temperature will also decrease. In this embodiment, the temperature is reduced by 5-10°C, which is still much higher than the saturated humid air outside. The non-condensable gas enters the upper air-cooling heat exchange module 4 again to exchange heat with the saturated humid air outside. The water vapor inside the air-cooling heat exchange module 4 condenses into liquid and then flows back into the non-condensable gas conveying pipe 8 to enter the output end of the evaporative heat exchange module 3 and then flows out through the liquid outlet pipe 7. The air is extracted by the vacuum equipment. The non-condensable gas releases heat when passing through the fin tube 20 bundle. The saturated air passing through the water collector 14 is heated by the fin tube 20 bundle to become unsaturated moist air, and then exhausted into the atmosphere through the fan 2. The unsaturated moist air will not be supercooled by the outside cold air and condensed into water mist when the temperature is low in winter, which has the effect of eliminating fog. Because the fin tube 20 bundle adopts air cooling for heat exchange, the evaporation of spray water can be reduced, which achieves the purpose of water saving, and the gaseous process gas is condensed again into liquid and flows back, which reduces the cost.

[0054] Example 2: Figure 3-5As shown, a plurality of air-cooling heat exchange modules 4 are provided, and the plurality of air-cooling heat exchange modules 4 are arranged in sequence in the horizontal direction. The plurality of air-cooling heat exchange modules 4 are installed in series or in parallel. The air-cooling heat exchange modules 4 are arranged at an angle, and the height of the end where the non-condensable gas flows in is lower than the end where the gas flows out, so as to facilitate the reflux of the liquid process gas.

[0055] The multiple air-cooling heat exchange modules 4 can perform multi-stage air cooling on the internal process gas to ensure the condensation effect of the process gas. At the same time, they can also perform multi-stage heat exchange with the external humid air to further increase the unsaturation degree of the external humid air and improve the demisting effect.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A negative pressure evaporative condenser, characterized in that: The invention comprises a shell (1), a fan (2) is arranged on the top of the shell (1), a condensation and cooling module is arranged in the shell (1), the condensation and cooling module comprises an evaporation heat exchange module (3) and an air cooling heat exchange module (4), a spray pipe (5) is arranged on the upper part of the evaporation heat exchange module (3), the spray water sprayed by the spray pipe (5) is used to cool the process gas in the evaporation heat exchange module (3), the input end of the evaporation heat exchange module (3) is connected to an air inlet pipe (6), and the output end is connected to a liquid outlet pipe (7) and a non-condensable gas conveying pipe (8), the air cooling heat exchange module (4) is located above the spray pipe (5), the input end of the air cooling heat exchange module (4) is connected to the evaporation heat exchange module (3) through the non-condensable gas conveying pipe (8), the output end of the air cooling heat exchange module (4) is connected to a vacuum device, and the air circulating in the shell (1) cools and condenses the non-condensable gas in the air cooling heat exchange module (4).

2. A negative pressure evaporative condenser according to claim 1, characterized in that: A water tank (9) is provided below the shell (1), an air inlet louver (13) is provided between the top end of the side wall of the water tank (9) and the bottom end of the side wall of the shell (1), a water pump (10) is provided outside the water tank (9), an input end of the water pump (10) is connected to the bottom of the water tank (9), and an upper water pipe (11) is connected between the output end of the water pump (10) and the spray pipe (5).

3. A negative pressure evaporative condenser according to claim 2, characterized in that: The evaporation heat exchange module (3) comprises a first tube sheet (15) and a second tube sheet (16), and a light pipe (17) located between the first tube sheet (15) and the second tube sheet (16); an input end of the light pipe (17) is fixed on the first tube sheet (15) and passes through the first tube sheet (15); an output end of the light pipe (17) is fixed on the second tube sheet (16) and passes through the second tube sheet (16); a first end cap (18) is connected to the outer side of the first tube sheet (15); and the first A process gas inlet distribution area is formed between the end cap (18) and the first tube sheet (15), the inlet pipe (6) is located in the middle of the first end cap (18), the outer side of the second tube sheet (16) is connected to the second end cap (19), a condensate and non-condensable gas distribution area is formed between the second end cap (19) and the second tube sheet (16), the liquid outlet pipe (7) is connected to the lower part of the second end cap (19), and the bottom end of the non-condensable gas delivery pipe (8) is connected to the top of the second end cap (19).

4. A negative pressure evaporative condenser according to claim 3, characterized in that: A water collector (14) is provided in the inner cavity of the shell (1) at a position above the spray pipe (5).

5. A negative pressure evaporative condenser according to claim 4, characterized in that: A condensation zone is located between the first tube sheet (15) and the second tube sheet (16), the light tube (17) is located in the condensation zone, a process gas inlet distribution zone and a condensate and non-condensable gas distribution zone are located outside the shell (1), the condensation zone is located inside the shell (1), and the spray pipe (5) is located above the condensation zone and is provided with a plurality of nozzles (12) corresponding to the light tube (17).

6. A negative pressure evaporative condenser according to any one of claims 3 to 5, characterized in that: A plurality of light pipes (17) are arranged, and the plurality of light pipes (17) are arranged in a staggered manner. The horizontal position of the input end of the light pipe (17) is higher than the horizontal position of the output end thereof. The angle between the light pipe (17) and the horizontal direction is ∠A, and 2°<∠A<5°.

7. A negative pressure evaporative condenser according to claim 6, characterized in that: The air-cooling heat exchange module (4) is arranged as a whole with an inclination, the horizontal position of the output end of the air-cooling heat exchange module (4) is higher than the horizontal position of the input end thereof, and the angle between the air-cooling heat exchange module (4) and the horizontal direction is ∠B, 2°<∠B<5°.

8. The negative pressure evaporative condenser according to claim 7, characterized in that: The air-cooling heat exchange module (4) comprises a fin tube (20) and a collection pipe (21) located at both ends of the fin tube (20); the fin tube (20) is provided with a plurality of fin tubes (20) arranged side by side, and both ends are collected by the collection pipe (21); the collection pipe (21) corresponding to the output end of the fin tube (20) is connected to a vacuum pumping device, and the collection pipe (21) corresponding to the input end of the fin tube (20) is connected to the top end of the non-condensable gas conveying pipe (8).

9. A negative pressure evaporative condenser according to claim 8, characterized in that: A plurality of the air-cooling heat exchange modules (4) are provided, and the plurality of the air-cooling heat exchange modules (4) are arranged in sequence along a horizontal direction.

Images