Low-pressure steam recycling system

Abstract

The utility model relates to the technical field of heat energy recovery, in particular to a low-pressure steam recycling system which comprises a rectifying tower, an absorption refrigerator, a cold water pipe and a cooling tower. Cold water in the cold water pipe enters an evaporator of the absorption refrigerator to release heat to obtain chilled water, and the cooling tower is used for cooling cooling water in an absorber and a condenser of the absorption refrigerator. Steam at the top of the rectifying tower is used as a power source of the absorption refrigerator to drive the absorption refrigerator, a tower top product is obtained through heat release and condensation, and cold water in the cold water pipe enters an evaporator of the absorption refrigerator, so that the temperature can be reduced to be lower, and the absorption refrigerator is used for a process. And by arranging the cooling tower, cooling water absorbing heat of working media in the absorber and the condenser can be cooled.

Description

Technical Field

[0001] This utility model relates to the field of heat energy recovery technology, specifically to a low-pressure steam recovery and utilization system. Background Technology

[0002] In modern industrial production processes, the demand for low-temperature chilled water is increasing. Low-temperature chilled water plays a vital role in many production fields, such as chemical, pharmaceutical, and food processing industries. It is widely used in key processes such as controlling reaction temperatures, cooling equipment, preserving perishable products, and cooling materials.

[0003] Currently, there are various methods for producing low-temperature chilled water industrially, but traditional methods often have many limitations. For example, some systems based on compression refrigeration mechanisms, while meeting certain refrigeration needs, suffer from high energy consumption, ozone layer depletion due to the use of Freon refrigerants, and high noise levels during operation. Moreover, with the continuous rise in energy prices and increasingly stringent environmental requirements, these drawbacks are becoming more pronounced, prompting the search for more energy-efficient and environmentally friendly solutions for producing low-temperature chilled water.

[0004] Distillation columns, as a mature chemical separation device, are widely used in petrochemical, chemical, and other industries. They achieve efficient separation of liquid mixtures based on the differences in the boiling points of their components. Components reaching their boiling point evaporate to form steam, which is then condensed to obtain the desired product. Currently, condensation is achieved using traditional condensers, which heat the cooling water in the condenser while the product cools. This heated cooling water typically requires cooling equipment to achieve water recycling, resulting in a waste of thermal energy.

[0005] In summary, this utility model addresses the need for low-temperature chilled water and the heat release that occurs during the condensation of industrial low-pressure steam. By leveraging the current development of absorption chiller units, it utilizes high-temperature steam to produce low-temperature chilled water. Utility Model Content

[0006] The purpose of this invention is to provide a low-pressure steam recovery and utilization system to address the problem of top products in distillation columns being condensed using traditional condensers. While the product cools, the cooling water in the condenser is heated. This heated cooling water typically requires cooling equipment, resulting in wasted heat energy.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A low-pressure steam recovery and utilization system includes a distillation column, an absorption chiller, a chilled water pipe, and a cooling tower. The steam discharged from the top of the distillation column enters the generator of the absorption chiller for exothermic condensation to obtain the top product of the column. The chilled water in the chilled water pipe enters the evaporator of the absorption chiller for exothermic condensation to obtain chilled water. The cooling tower is used to cool the cooling water in the absorber and condenser of the absorption chiller.

[0009] A further technical solution is that the cooling tower is equipped with a first cooling water and a heat exchange coil immersed in the first cooling water. The heat exchange coil is equipped with a second cooling water. The outlet end of the heat exchange coil is connected to the first cooling coil in the absorber through the first cooling water pipe. The inlet end of the heat exchange coil is connected to the second cooling coil in the condenser through the second cooling water pipe. The first cooling coil and the second cooling coil are connected. A circulating water pump is installed on the first cooling water pipe.

[0010] A further technical solution is that a fan with an inward-facing airflow direction is installed on the top of the cooling tower, and a heat dissipation plate is inclinedly installed on the upper side of the first cooling water inside the cooling tower. The heat dissipation plate is provided with several water passage holes that run through the upper and lower sides. A water pump is installed at the bottom of the cooling tower, and the outlet end of the water pump is connected to an outlet pipe. The upper end of the outlet pipe is placed on the upper side of the heat dissipation plate. An air inlet that runs through the inside and outside is provided on the side of the cooling tower below the heat dissipation plate.

[0011] A further technical solution is that a water spray pipe is horizontally installed on the upper side of the heat sink. The surface of the water spray pipe is provided with several water outlet holes that are connected internally and externally. The water outlet holes are connected to water spray nozzles, and the water outlet pipe is connected to the water spray pipe.

[0012] A further technical solution is that an air inlet pipe is vertically installed on the side of the cooling tower, the upper end of the air inlet pipe is bent horizontally, the lower end of the air inlet pipe is connected to the air inlet, and an air filter is installed at the upper end of the air inlet pipe.

[0013] A further technical solution is to have several air inlets and air vents installed along the side of the cooling tower.

[0014] A further technical solution is to have two or more heat dissipation plates spaced at intervals from top to bottom inside the cooling tower.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. The absorption chiller is driven by the steam at the top of the distillation column, and the product at the top of the column is obtained by exothermic condensation. The cold water in the cold water pipe enters the evaporator of the absorption chiller, which can lower the temperature further for use in the process; 2. By setting up a cooling tower, the cooling water that has absorbed the heat of the working fluid in the absorber and condenser can be cooled; 3. Compared with the compressor refrigeration system, this system can use high-temperature steam as an energy source for refrigeration. While completing the steam condensation process, it can also use this heat for refrigeration, thus saving energy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a low-pressure steam recovery and utilization system according to the present invention.

[0017] Figure 2 This is a schematic diagram of a cooling tower for a low-pressure steam recovery and utilization system according to this utility model.

[0018] Figure 3 This is a schematic diagram of the spray pipe of a low-pressure steam recovery system according to the present invention.

[0019] Figure 4 This is a schematic diagram of an absorption chiller for a low-pressure steam recovery and utilization system according to this utility model.

[0020] Icons: 1-Distillation column, 2-Absorption chiller, 3-Cold water pipe, 4-Cooling tower, 5-Steam pipe, 6-Product discharge pipe, 7-First cooling water, 8-Heat exchange coil, 9-First cooling water pipe, 10-First cooling coil, 11-Second cooling water pipe, 12-Second cooling coil, 13-Fan, 14-Heat radiator, 15-Water pump, 16-Water outlet pipe, 17-Air inlet, 18-Water spray pipe, 19-Water spray nozzle, 20-Air inlet pipe, 21-Generator, 22-Condenser, 23-Evaporator, 24-Absorber. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] Figures 1 to 4 The following is an embodiment of the present invention.

[0023] Example:

[0024] A low-pressure steam recovery and utilization system includes a distillation column 1, an absorption chiller 2, a chilled water pipe 3, and a cooling tower 4. Steam discharged from the top of the distillation column 1 enters the generator 21 of the absorption chiller 2 for exothermic condensation to obtain the top product. Chilled water in the chilled water pipe 3 enters the evaporator 23 of the absorption chiller 2 for exothermic condensation to obtain chilled water. The cooling tower 4 is used to cool the cooling water in the absorber 24 and condenser 22 of the absorption chiller 2. The steam from the top of the distillation column 1 serves as the power source for the absorption chiller 2, driving it and exothermicly condensing to obtain the top product. The chilled water in the chilled water pipe 3 enters the evaporator 23 of the absorption chiller 2, achieving a lower temperature for further process use. The cooling tower 4 cools the cooling water that has absorbed heat from the working fluid in the absorber 24 and condenser 22. Compared to compressor refrigeration systems, this system utilizes high-temperature steam as an energy source for refrigeration, simultaneously performing steam condensation and utilizing this heat for cooling, thus saving energy. The steam discharged from the top of the distillation column 1 enters the generator 21 of the absorption chiller 2 through the steam pipeline 5, heating the working fluid in the generator 21. After heating, the steam is discharged from the generator through the product discharge pipe 6.

[0025] The cooling tower 4 contains a first cooling water 7 and a heat exchange coil 8 submerged in the first cooling water 7. The heat exchange coil 8 contains a second cooling water. The outlet of the heat exchange coil 8 is connected to the first cooling coil 10 in the absorber 24 via a first cooling water pipe 9, and the inlet of the heat exchange coil 8 is connected to the second cooling coil 12 in the condenser 22 via a second cooling water pipe 11. The first cooling coil 10 and the second cooling coil 12 are connected. A circulating water pump is installed on the first cooling water pipe 9. The second cooling water, having absorbed heat in the absorber 24 and condenser 22, enters the cooling tower 4 through the heat exchange coil 8 and exchanges heat with the first cooling water 7 through the heat exchange coil 8, thus cooling the second cooling water. The cooled second cooling water then re-enters the first cooling coil 10 and the second cooling coil 12 through the first cooling water pipe 9 to absorb heat again. The circulating water pump facilitates the flow of the second cooling water.

[0026] A fan 13 with an inward-facing airflow direction is installed on the top of the cooling tower 4. A heat dissipation plate 14 is inclinedly arranged on the upper side of the first cooling water 7 inside the cooling tower 4. Several water passage holes are provided on the heat dissipation plate 14, which connect the upper and lower sides. A water pump 15 is installed at the bottom of the cooling tower 4. The outlet end of the water pump 15 is connected to a water outlet pipe 16. The upper end of the water outlet pipe 16 is placed on the upper side of the heat dissipation plate 14. An air inlet 17 connecting the inside and outside is provided on the side of the cooling tower 4 below the heat dissipation plate 14. In this configuration, the first cooling water 7 gradually heats up after absorbing heat from the second cooling water. The heated first cooling water 7 is insufficient to cool the second cooling water, so it needs to be cooled. This is achieved by pumping the first cooling water 7 onto the heat sink 14, and then allowing it to flow through the water-passing holes on the heat sink 14 to the lower part of the cooling tower 4. The fan 13 then expels air from inside the cooling tower 4, and fresh air enters the cooling tower 4 through the air inlet 17. As the first cooling water 7 flows through the water-passing holes, the air also moves upwards through the holes. This process allows the first cooling water 7 to come into contact with fresh air during the water-passing holes and as it drips, resulting in heat exchange and a reduction in its temperature. Furthermore, because the heat sink 14 is inclined, the first cooling water 7 flows along the surface of the heat sink 14, distributing downwards through the water-passing holes.

[0027] A water spray pipe 18 is horizontally mounted on the upper side of the heat sink 14. The surface of the water spray pipe 18 has several interconnected water outlets, each connected to a spray nozzle 19. The water outlet pipe 16 is connected to the water spray pipe 18. By configuring the water spray pipe 18 and spray nozzles 19, the first cooling water 7 can be evenly sprayed onto the upper side of the heat sink 14. This allows the first cooling water 7 to drip evenly from different water passages, while simultaneously exchanging heat with the air within and below the water passages, thus reducing the temperature.

[0028] An air inlet pipe 20 is vertically installed on the side of the cooling tower 4. The upper end of the air inlet pipe 20 is bent horizontally, and the lower end of the air inlet pipe 20 is connected to the air inlet 17. An air filter is installed at the upper end of the air inlet pipe 20. By setting up the air inlet pipe 20 and the air filter, external dust or debris can be prevented from entering the cooling tower 4 through the air inlet 17.

[0029] Several air inlets 20 and air vents 17 are provided along the side of the cooling tower 4. Through multiple air vents 17 and air inlets 20, low-temperature external air can be evenly introduced into the cooling tower 4, thereby uniformly cooling the dripping first cooling water 7 and improving the cooling effect.

[0030] There are two or more heat dissipation plates 14 arranged at intervals from top to bottom inside the cooling tower 4. Through two or more heat dissipation plates 14, the first cooling water 7 can drip downwards in segments. The first cooling water 7 dripping from the upper heat dissipation plate 14 will splash water droplets, increasing the contact area with the air and improving the cooling effect.

[0031] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A low-pressure steam recovery and utilization system, characterized in that, The system includes a distillation column (1), an absorption chiller (2), a cold water pipe (3), and a cooling tower (4). The steam discharged from the top of the distillation column (1) enters the generator (21) of the absorption chiller (2) for exothermic condensation to obtain the top product. The cold water in the cold water pipe (3) enters the evaporator (23) of the absorption chiller (2) for exothermic condensation to obtain chilled water. The cooling tower (4) is used to cool the cooling water in the absorber (24) and condenser (22) of the absorption chiller (2).

2. The low-pressure steam recovery and utilization system according to claim 1, characterized in that: The cooling tower (4) is provided with a first cooling water (7) and a heat exchange coil (8) immersed in the first cooling water (7). The heat exchange coil (8) is provided with a second cooling water. The outlet end of the heat exchange coil (8) is connected to the first cooling coil (10) in the absorber (24) through the first cooling water pipe (9). The inlet end of the heat exchange coil (8) is connected to the second cooling coil (12) in the condenser (22) through the second cooling water pipe (11). The first cooling coil (10) and the second cooling coil (12) are connected. A circulating water pump is installed on the first cooling water pipe (9).

3. The low-pressure steam recovery and utilization system according to claim 2, characterized in that: The top of the cooling tower (4) is equipped with a fan (13) that blows from the inside out. Inside the cooling tower (4), a heat dissipation plate (14) is inclinedly arranged on the upper side of the first cooling water (7). The heat dissipation plate (14) is provided with several water passage holes that pass through the upper and lower sides. A water pump (15) is installed at the bottom of the cooling tower (4). The outlet end of the water pump (15) is connected to a water outlet pipe (16). The upper end of the water outlet pipe (16) is placed on the upper side of the heat dissipation plate (14). The side of the cooling tower (4) is provided with an air inlet (17) that passes through the inside and outside below the heat dissipation plate (14).

4. A low-pressure steam recovery and utilization system according to claim 3, characterized in that: A water spray pipe (18) is horizontally installed on the upper side of the heat sink (14). The surface of the water spray pipe (18) is provided with several water outlet holes that are connected internally and externally. The water outlet holes are connected to water spray nozzles (19). The water outlet pipe (16) is connected to the water spray pipe (18).

5. A low-pressure steam recovery and utilization system according to claim 3, characterized in that: The cooling tower (4) has an air inlet pipe (20) installed vertically on its side. The upper end of the air inlet pipe (20) is bent horizontally. The lower end of the air inlet pipe (20) is connected to the air inlet (17). An air filter is installed at the upper end of the air inlet pipe (20).

6. A low-pressure steam recovery and utilization system according to claim 5, characterized in that: Several air inlets (20) and air outlets (17) are provided along the side of the cooling tower (4).

7. A low-pressure steam recovery and utilization system according to claim 3, characterized in that: There are two or more heat dissipation plates (14) arranged at intervals from top to bottom inside the cooling tower (4).

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