Waste heat utilization system for compression heat regeneration adsorption type drying machine

Abstract

The utility model discloses a waste heat utilization system of a compression heat regeneration adsorption type drying machine. The waste heat utilization system comprises a precooler, an air compressor, the compression heat regeneration adsorption type drying machine, an absorption refrigerator and a cooling tower, the precooler is connected with an air compressor, and the air compressor is connected with a compression heat regeneration adsorption dryer; the compression heat regeneration adsorption dryer comprises a cooler; the cooler is connected with an absorption refrigerator to form a waste heat utilization circulation loop; the absorption refrigerator is connected with the precooler to form a chilled water circulation loop; and the absorption refrigerator is connected with the cooling tower to form a cooling water circulation loop. Waste heat of compressed air treated by the compression heat regeneration adsorption type drying machine can be used for providing a heat source for the absorption type refrigerating machine to prepare chilled water to be conveyed to the precooler, so that the temperature and humidity of air at an inlet of the air compressor are reduced, the air yield of the air compressor is improved, the energy consumption of the air compressor is reduced, and safe and economical operation of the air compressor is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange, and in particular relates to a waste heat utilization system of a compression heat regeneration adsorption dryer. Background Art

[0002] The compression heat regeneration adsorption dryer is one of the more advanced compressed air post-processing equipment. Its working principle is to use the heat contained in the high-temperature compressed air at the outlet of the air compressor to heat the adsorbent that has undergone the adsorption process, so that the adsorbent can be desorbed and regenerated. Compared with heatless and micro-heat regeneration adsorption dryers, compression heat regeneration adsorption dryers do not require additional heating, which reduces the consumption of product compressed air and reduces the energy consumption of the dryer. However, during the operation of conventional compression heat regeneration adsorption dryers, the waste heat of the high-temperature compressed air is eventually taken away by the circulating cooling water in the cooler. There is no waste heat utilization measure, resulting in a certain degree of energy waste.

[0003] In addition, high air temperature and high humidity will have an adverse effect on the normal operation of the air compressor. The higher the air temperature entering the air compressor, the higher the temperature of the compressed air, which will cause the air compressor to trip due to high temperature and other faults, affecting the safe operation of the air compressor; and the air density will decrease accordingly, which will cause the air compressor to produce insufficient gas. The higher the air humidity, the higher the moisture content in the air, which will also cause the air compressor to produce insufficient gas; the moisture in the air is corrosive, which can easily cause the compressed air equipment and pipelines to rust, shortening the service life. Utility Model Content

[0004] The utility model aims to overcome the deficiencies in the prior art and provide a system for utilizing waste heat of a compression heat regeneration adsorption dryer, which can utilize the waste heat of compressed air treated by the compression heat regeneration adsorption dryer to provide a heat source for an absorption refrigerator to produce chilled water and send it to a precooler, thereby reducing the temperature and humidity of the air at the inlet of the air compressor, increasing the gas output of the air compressor, reducing the energy consumption of the air compressor, and ensuring the safe and economical operation of the air compressor.

[0005] The utility model provides the following technical solutions:

[0006] A compression heat regeneration adsorption dryer waste heat utilization system, comprising a precooler, an air compressor, a compression heat regeneration adsorption dryer, an absorption refrigerator and a cooling tower;

[0007] The precooler is connected to an air compressor, and the air compressor is connected to a compression heat regeneration adsorption dryer;

[0008] The compression heat regeneration adsorption dryer includes a cooler; the cooler is connected to the absorption refrigerator to form a waste heat utilization circulation loop;

[0009] The absorption refrigeration machine is connected to the precooler to form a chilled water circulation loop;

[0010] The absorption refrigerator is connected to a cooling tower to form a cooling water circulation loop.

[0011] Furthermore, the precooler is provided with an air inlet and an air outlet, a dew point meter is installed at the air inlet, and the air outlet is connected to the inlet end of the air compressor through a first air delivery pipe.

[0012] Furthermore, the precooler is provided with a drain outlet, and the drain outlet is connected to a drain pipe.

[0013] Furthermore, the cooler is provided with a working fluid outlet and a working fluid inlet, and the absorption refrigerator is provided with a heat source inlet and a heat source outlet; the working fluid outlet is connected to the heat source inlet through a working fluid outlet pipe, and a working fluid pump is connected to the working fluid outlet pipe; the heat source outlet is connected to the working fluid inlet through a working fluid inlet pipe.

[0014] Furthermore, the absorption chiller is provided with a first chilled water outlet and a first chilled water inlet, and the precooler is provided with a second chilled water inlet and a second chilled water outlet; the first chilled water outlet is connected to the second chilled water inlet through a chilled water outlet pipe, and a chilled water pump is connected to the chilled water outlet pipe; the second chilled water outlet is connected to the first chilled water inlet through a chilled water inlet pipe.

[0015] Furthermore, a thermometer is connected to the chilled water outlet pipe.

[0016] Furthermore, the absorption refrigeration machine is provided with a cooling water inlet and a cooling water outlet, the outlet end of the cooling tower is connected to the cooling water inlet through a cooling water inlet pipe, and the cooling water inlet pipe is connected to a cooling water pump; the cooling water outlet is connected to the inlet end of the cooling tower through a cooling water outlet pipe.

[0017] Furthermore, the air compressor is a centrifuge or an oil-free screw air compressor.

[0018] Furthermore, the absorption refrigerator is an ammonia absorption refrigerator or a lithium bromide absorption refrigerator.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] The utility model provides a waste heat utilization system for a compression heat regeneration adsorption dryer, which provides three sets of heat exchange circulation loops: a cooler of the compression heat regeneration adsorption dryer is connected to an absorption refrigerator to form a waste heat utilization circulation loop, the absorption refrigerator is connected to a precooler to form a chilled water circulation loop, and the absorption refrigerator is connected to a cooling tower to form a cooling water circulation loop; through the above three sets of heat exchange circulation loops, the waste heat of the compressed air treated by the compression heat regeneration adsorption dryer is used to provide a heat source for the absorption refrigerator to prepare chilled water and send it to the precooler, thereby reducing the temperature and humidity of the air inlet of the air compressor, especially under high temperature and high humidity air environment conditions, the air output of the air compressor is increased, the energy consumption of the air compressor is reduced, and the safe and economical operation of the air compressor is guaranteed. At the same time, the high-temperature cooling water generated by the absorption refrigerator is sent to the cooling tower for heat dissipation and cooling, thereby ensuring the continuous and stable operation of the absorption refrigerator and the entire waste heat utilization system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a waste heat utilization system of a compression heat regeneration adsorption dryer in an embodiment of the utility model;

[0022] The following are marked in the figure: 1, air compressor; 2, compression heat regeneration adsorption dryer; 21, cooler; 211, working fluid outlet; 212, working fluid inlet; 3, absorption refrigerator; 31, heat source inlet; 32, heat source outlet; 33, first chilled water inlet; 34, first chilled water outlet; 35, cooling water inlet; 36, cooling water outlet; 4, precooler; 41, second chilled water inlet; 42, second chilled water outlet; 43, air Inlet; 44, air outlet; 45, drain outlet; 5, cooling tower; 6, working fluid pump; 7, chilled water pump; 8, cooling water pump; 9, thermometer; 10, dew point meter; 11, first air delivery pipe; 12, second air delivery pipe; 13, third air delivery pipe; 14, working fluid outlet pipe; 15, working fluid inlet pipe; 16, chilled water outlet pipe; 17, chilled water inlet pipe; 18, cooling water outlet pipe; 19, cooling water inlet pipe; 20, drain pipe. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0024] like Figure 1 As shown, this embodiment provides a compression heat regeneration adsorption dryer waste heat utilization system, including a precooler 4, an air compressor 1, a compression heat regeneration adsorption dryer 2, an absorption refrigerator 3 and a cooling tower 5.

[0025] The precooler 4 is connected to the air compressor 1. Specifically, the precooler 4 is provided with an air inlet 43 and an air outlet 44. A dew point meter 10 is installed at the air inlet 43 to monitor the dew point of the air; the air outlet 44 is connected to the inlet end of the air compressor 1 through the first air delivery pipe 11. The air first flows through the precooler 4, is cooled and dehumidified by the chilled water therein, and then flows into the air compressor 1. A drain port 45 is provided at the low point of the precooler 4, and the drain port 45 is connected to a drain pipe 20 to discharge the moisture condensed after the air is cooled by the precooler 4.

[0026] The compression heat regeneration adsorption dryer 2 includes a cooler 21 ; the outlet end of the air compressor 1 is connected to the inlet end of the compression heat regeneration adsorption dryer 2 through the second air delivery pipe 12 , and the outlet end of the compression heat regeneration adsorption dryer 2 is connected to the third air delivery pipe 13 .

[0027] The air compressor 1 is a centrifugal compressor or an oil-free screw air compressor. The oil-free high-temperature compressed air discharged from the air compressor flows to the compression heat regeneration adsorption dryer 2 through the second air delivery pipe 12, and is discharged through the third air delivery pipe 13 after treatment. During the treatment process, the waste heat of the compressed air will heat the working medium in the cooler 21.

[0028] The absorption refrigerator 3 is provided with a heat source inlet 31, a heat source outlet 32, a first chilled water inlet 33, a first chilled water outlet 34, a cooling water inlet 35 and a cooling water outlet 36. The absorption refrigerator 3 can be an ammonia absorption refrigerator, whose working fluid pair consists of ammonia-water; the absorption refrigerator 3 can also be a lithium bromide absorption refrigerator, whose working fluid pair consists of water-lithium bromide. The absorption refrigerator 3 can adopt a commercially available absorption refrigerator, and other specific structures belong to the prior art and are not repeated here.

[0029] The cooler 21 is connected to the absorption refrigeration machine 3 and forms a waste heat utilization circulation loop. Specifically, the cooler 21 of the compression heat regeneration adsorption dryer 2 is provided with a working fluid outlet 211 and a working fluid inlet 212. The working fluid outlet 212 is connected to the heat source inlet 31 through the working fluid outlet pipe 14, and the working fluid outlet pipe 14 is connected to the working fluid pump 6; the heat source outlet 32 ​​is connected to the working fluid inlet 212 through the working fluid inlet pipe 15. When the hot and humid compressed air flows to the cooler 21, its remaining waste heat heats the working fluid in the cooler 21. The heated working fluid flows out from the working fluid outlet 211, is pressurized by the working fluid pump 6, and is sent to the heat source inlet 31 through the working fluid outlet pipe 14. As the heat source of the absorption refrigerator 3, it drives the working fluid inside the absorption refrigerator 3 to perform an absorption refrigeration cycle to produce chilled water. The produced chilled water is generally 7°C. At the same time, the working fluid after being cooled in the absorption refrigerator 3 flows out from the heat source outlet 32 ​​again, and returns to the cooler 21 through the working fluid inlet pipe 15 and the working fluid inlet 212.

[0030] The absorption chiller 3 is connected to the precooler 4 and forms a chilled water circulation loop. Specifically, the precooler 4 is provided with a second chilled water inlet 41 and a second chilled water outlet 42; the first chilled water outlet 34 is connected to the second chilled water inlet 41 through a chilled water outlet pipe 16, and the chilled water outlet pipe 16 is connected to a chilled water pump 7; the second chilled water outlet 42 is connected to the first chilled water inlet 33 through a chilled water inlet pipe 17; and the chilled water outlet pipe 16 is connected to a thermometer 9. The chilled water produced by the absorption chiller 3 flows out from the first chilled water outlet 34, is pressurized by the chilled water pump 7, and is sent to the precooler 4 through the chilled water outlet pipe 16 and the second chilled water inlet 41. The precooler 4 cools and dehumidifies the air at the inlet of the air compressor 1, and the thermometer 9 is used to monitor the temperature of the chilled water; at the same time, after the chilled water is heated in the precooler 4, it flows out from the second chilled water outlet 42, and returns to the absorption chiller 3 through the chilled water inlet pipe 17 and the first chilled water inlet 33.

[0031] The absorption chiller 3 is connected to the cooling tower 5 and forms a cooling water circulation loop. Specifically, the absorption chiller is provided with a cooling water inlet 35 and a cooling water outlet 36. The outlet end of the cooling tower 5 is connected to the cooling water inlet 35 through a cooling water inlet pipe 19, and a cooling water pump 8 is connected to the cooling water inlet pipe 19; the cooling water outlet 36 is connected to the inlet end of the cooling tower 5 through a cooling water outlet pipe 18. The high-temperature cooling water generated by the absorption chiller 3 flows out from the cooling water outlet 36, and is sent to the cooling tower 5 through the cooling water outlet pipe 18 for heat dissipation and cooling. The cooled cooling water flows out from the outlet end of the cooling tower 5, is pressurized by the cooling water pump 8, and enters the absorption chiller 3 again through the cooling water inlet pipe 19 and the cooling water inlet 35.

[0032] The precooler 4 in this embodiment can adopt commercially available air refrigeration equipment, and the compression heat regeneration adsorption dryer 2 and the cooling tower 5 can adopt existing commercially available equipment. The specific internal structure belongs to the existing technology and will not be repeated here.

[0033] The working principle of the waste heat utilization system of the compression heat regeneration adsorption dryer in this embodiment is as follows:

[0034] When the air temperature is high and the humidity is high, such as in summer, when the dew point meter 10 detects that the air dew point temperature is significantly higher than the chilled water temperature, the absorption chiller 3 and the chilled water pump 7 are started to operate the chilled water circulation loop, and the chilled water is transported to the precooler 4 to cool and dehumidify the inlet air of the air compressor 1, so as to increase the gas output of the air compressor 1 and reduce the energy consumption of the air compressor.

[0035] When the air temperature is low and the humidity is low, such as in winter, when the dew point meter 10 detects that the air dew point temperature is significantly lower than the chilled water temperature, the absorption chiller 3 and the chilled water pump 7 can be stopped, and the chilled water circulation loop can be closed, while the waste heat utilization circulation loop and the cooling water circulation loop are not affected and can always operate normally. The waste heat of the compressed air absorbed in the cooler 21 is exchanged with cooling water in the absorption chiller 3, and finally sent to the cooling tower 5 and discharged into the atmosphere.

[0036] It should be noted that, in the description of the present invention, the directions or positional relationships indicated by terms such as "front", "rear", "left", "right", "up", "down", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0037] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0038] The above is only a preferred embodiment 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 technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A system for utilizing waste heat from a compression heat regeneration adsorption dryer, characterized in that: Includes precooler, air compressor, compression heat regeneration adsorption dryer, absorption refrigerator and cooling tower; The precooler is connected to an air compressor, and the air compressor is connected to a compression heat regeneration adsorption dryer; The compression heat regeneration adsorption dryer includes a cooler; the cooler is connected to the absorption refrigerator to form a waste heat utilization circulation loop; The absorption refrigeration machine is connected to the precooler to form a chilled water circulation loop; The absorption refrigerator is connected to a cooling tower to form a cooling water circulation loop.

2. The compression heat regeneration adsorption dryer waste heat utilization system according to claim 1 is characterized in that: The precooler is provided with an air inlet and an air outlet. A dew point meter is installed at the air inlet. The air outlet is connected to the inlet end of the air compressor through a first air delivery pipe.

3. The compression heat regeneration adsorption dryer waste heat utilization system according to claim 1, characterized in that: The precooler is provided with a drain outlet, and the drain outlet is connected with a drain pipe.

4. The compression heat regeneration adsorption dryer waste heat utilization system according to claim 1, characterized in that: The cooler is provided with a working fluid outlet and a working fluid inlet, and the absorption refrigerator is provided with a heat source inlet and a heat source outlet; the working fluid outlet is connected to the heat source inlet through a working fluid outlet pipe, and a working fluid pump is connected to the working fluid outlet pipe; the heat source outlet is connected to the working fluid inlet through a working fluid inlet pipe.

5. The compression heat regeneration adsorption dryer waste heat utilization system according to claim 1, characterized in that: The absorption refrigeration machine is provided with a first chilled water outlet and a first chilled water inlet, and the precooler is provided with a second chilled water inlet and a second chilled water outlet; the first chilled water outlet is connected to the second chilled water inlet through a chilled water outlet pipe, and a chilled water pump is connected to the chilled water outlet pipe; the second chilled water outlet is connected to the first chilled water inlet through a chilled water inlet pipe.

6. The compression heat regeneration adsorption dryer waste heat utilization system according to claim 5, characterized in that: The chilled water outlet pipe is connected with a thermometer.

7. The compression heat regeneration adsorption dryer waste heat utilization system according to claim 1, characterized in that: The absorption refrigeration machine is provided with a cooling water inlet and a cooling water outlet. The outlet end of the cooling tower is connected to the cooling water inlet through a cooling water inlet pipe, and a cooling water pump is connected to the cooling water inlet pipe; the cooling water outlet is connected to the inlet end of the cooling tower through a cooling water outlet pipe.

8. The compression heat regeneration adsorption dryer waste heat utilization system according to claim 1, characterized in that: The air compressor is a centrifuge or an oil-free screw air compressor.

9. The compression heat regeneration adsorption dryer waste heat utilization system according to claim 1, characterized in that: The absorption refrigerator is an ammonia absorption refrigerator or a lithium bromide absorption refrigerator.

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