Bellows falling film condensing cooler

Abstract

The application discloses a bellows falling film condensation cooler, which comprises a shell, a tube plate one, a tube plate two, a steam guide head one and a steam guide head two. The tube plate one and the tube plate two are fixedly connected with bellows heat exchange pipes. The steam guide head one is arranged on the left side of the tube plate one, and the top of the steam guide head one is provided with a secondary steam inlet. The steam guide head two is arranged on the right side of the tube plate two, and the bottom of the steam guide head two is provided with a condensate outlet. A film distributor is arranged in the cavity above the bellows heat exchange pipes. At least one exhaust port is arranged on the top wall of the shell above the film distributor. A water receiving basin is arranged below the shell, and a liquid inlet is arranged on the water receiving basin. A circulating water pipe with a water pump is connected to the water outlet at the bottom of the water receiving basin, and the upper end of the circulating water pipe is connected with the inlet at the right end of the film distributor.

Description

Technical Field

[0001] This invention relates to the field of falling film evaporator technology, and more particularly to a corrugated tube falling film condenser cooler. Background Technology

[0002] Heat exchangers are key equipment for heat exchange and are widely used in pharmaceuticals, food, chemicals, sugar refining, salt production, caustic soda manufacturing, and other fields. When concentrating liquid materials, steam is introduced from the first effect, and the flash steam from the first effect is used to heat the second effect, and so on, with the temperature of each effect gradually decreasing, reaching approximately 50°C for the flash steam in the last effect. Currently, the method for treating the flash steam in the last effect is to use circulating water as a heat carrier, dissipating a large amount of heat from the flash steam into the atmosphere through a cooling tower. This results in the inefficient use of the flash steam in the last effect, leading to energy waste. To improve energy efficiency, Chinese utility model patent specification CN203999466U discloses a device for utilizing the heat energy of the flash steam in the last effect of a corn syrup evaporator. This device includes a surface condenser, a first circulating water pump, piping, a cooling tower, a plate heat exchanger, a high-level water tank, a starch airflow heat exchanger, and a second circulating water pump. This device can reuse the flash steam in the last effect of the corn syrup evaporator, thus improving energy efficiency. However, its drawback is that the thermal energy utilization device requires large equipment such as cooling towers, resulting in high investment costs. Summary of the Invention

[0003] To address the aforementioned shortcomings, this invention provides a bellows falling film condenser cooler with low investment cost.

[0004] This invention is implemented as follows: A corrugated tube falling film condenser includes a shell, tube sheet 1 and tube sheet 2, steam guide head 1 and steam guide head 2 disposed on the left and right sides of the shell. Corrugated heat exchange tubes are fixedly connected to tube sheet 1 and tube sheet 2. Steam guide head 1 is located on the outside of the left side of tube sheet 1, and has a secondary steam inlet at its top. Steam guide head 2 is located on the outside of the right side of tube sheet 2, and has a condensate outlet at its bottom. A film distributor is disposed in the cavity above the corrugated heat exchange tubes. At least one exhaust port is provided on the top wall of the shell above the film distributor, and an exhaust fan is disposed in the exhaust port. Packing is disposed in the lower part of the inner cavity of the shell. A water receiving basin is disposed below the shell, with an inlet on the water receiving basin. A circulating water pipe with a water pump is connected to the outlet at the bottom of the water receiving basin, and the upper end of the circulating water pipe is connected to the inlet at the right end of the film distributor.

[0005] With the above structure, during operation, the coolant (material) enters the receiving pan through the inlet. The coolant in the receiving pan is pumped into the film distributor, which evenly distributes the coolant onto the outer surface of the corrugated heat exchanger tube bundle, forming a liquid film. The liquid film of coolant flows downwards onto the outer surface of the corrugated condenser tube bundle under gravity. Simultaneously, the secondary steam from the last efficiency of the evaporator (not shown in the figure) enters the steam guide head through the secondary steam inlet. The secondary steam quickly enters the corrugated heat exchanger tube side within the steam guide head, where it interacts with the liquid film of coolant outside the tubes. During heat exchange, the corrugated heat exchange tubes, with their corrugated outline, facilitate turbulence on both the inner and outer sides. This turbulence enhances the heat exchange efficiency of steam condensation within the tubes, significantly increasing the heat transfer coefficient. After releasing heat, the secondary steam condenses into condensate, which is discharged through the condensate outlet. The cooling liquid absorbs the latent heat of the secondary steam and begins to evaporate. The evaporated vapor is discharged into the atmosphere by an exhaust fan, while the evaporated cooling liquid enters the packing area, where it undergoes further subcooling as it flows downwards in a film. Because the condenser uses corrugated heat exchange tubes, replacing the previous straight tubes, the heat exchange efficiency is greatly improved. This eliminates the need for cooling towers and other equipment, reducing investment costs. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the structure of the bellows falling film condenser cooler of the present invention. Detailed Implementation

[0007] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0008] This invention provides, for example Figure 1 The corrugated tube falling film condenser shown includes a shell 6, tube sheets 1-4 and 2-11 arranged on the left and right sides of the shell 6, and corrugated heat exchange tubes 10 fixed on tube sheets 1-4 and 2-11. A steam guide head 3 is provided on the outside of the left side of tube sheet 1-4, and a secondary steam inlet 5 is provided at the top of the steam guide head 1-3. A steam guide head 2-12 is provided on the outside of the right side of tube sheet 2-11, and a condensate outlet 13 is provided at the bottom of the steam guide head 2-12. A film distributor 9 is provided in the cavity above the corrugated heat exchange tubes. At least one exhaust port 7 is provided on the top wall of the shell 6 above the film distributor 9, and an exhaust fan 8 is provided in the exhaust port 7. The lower part of the inner cavity of the shell 6 is provided with packing 16. A water receiving basin 1 is provided below the shell 6, and an inlet 2 is provided on the water receiving basin 1. A circulating water pipe 14 with a water pump 15 is connected to the outlet at the bottom of the water receiving basin 1. The upper end of the circulating water pipe 14 is connected to the inlet at the right end of the film distributor 9.

[0009] During operation, the valve is opened to allow coolant to enter the receiving pan 1 through the inlet 2. The coolant in the receiving pan is then pumped into the film distributor 9 by the water pump 15. The coolant (material) is evenly distributed onto the outer surface of the corrugated heat exchange tube bundle 10 through the film distributor, forming a liquid film. The liquid film of coolant flows downwards onto the outer surface of the corrugated condenser tube under gravity. At the same time, the unreacted secondary steam enters the steam guide head 3 through the secondary steam inlet 5. The secondary steam quickly enters the tube side of the corrugated heat exchange tube 10 within the steam guide head 3. The secondary steam entering the tube side exchanges heat with the liquid film of coolant outside the tube. After releasing heat, the secondary steam condenses into condensate, which is discharged from the condensate outlet 13. The coolant phase absorbs the latent heat of the secondary steam and begins to evaporate. The non-condensable vapor of the coolant is discharged into the atmosphere by the exhaust fan 8. Simultaneously, the liquid material of the evaporated coolant phase enters the packing 16 region. When the liquid material in the packing 16 region flows downwards in a film, it is further subcooled.

Claims

1. A bellows falling film condenser cooler, comprising a shell (6), tube sheet 1 (4) and tube sheet 2 (11) disposed on the left and right sides of the shell (6), steam guide head 1 (3) and steam guide head 2 (12), characterized in that: Corrugated heat exchange tubes (10) are fixedly connected to tube sheet 1 (4) and tube sheet 2 (11). Steam guide head 1 (3) is located on the outside of the left side of tube sheet 1 (4). A secondary steam inlet (5) is provided at the top of steam guide head 1 (3). Steam guide head 2 (12) is located on the outside of the right side of tube sheet 2 (11). A condensate outlet (13) is provided at the bottom of steam guide head 2 (12). A film distributor (9) is provided in the cavity above the corrugated heat exchange tube (10). (9) At least one exhaust port (7) is provided on the top wall of the upper shell (6), and an exhaust fan (8) is provided inside the exhaust port (7); a packing (16) is provided in the lower part of the inner cavity of the shell (6); a water receiving basin (1) is provided below the shell (6), and a liquid inlet (2) is provided on the water receiving basin (1). A circulating water pipe (14) with a water pump (15) is connected to the water outlet at the bottom of the water receiving basin (1). The upper end of the circulating water pipe (14) is connected to the inlet at the right end of the above-mentioned film distributor (9).

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