Gas separation system utilizing hot gas for refrigeration

Abstract

The utility model discloses a gas separation system utilizing hot gas for refrigeration, which relates to the technical field of waste heat recovery and comprises a gas separation system consisting of an air filter, an air cooler, an air compressor, a purification system and a fractionating tower system, and heat exchangers are arranged in the air filter, the air cooler, the air compressor, the purification system and the fractionating tower system. A compression heat refrigeration system is arranged between the air compressor and the purification system, the compression heat refrigeration system comprises two groups of chilled water circulation pipelines, water supply pipelines of the two groups of chilled water circulation pipelines are connected with a liquid inlet end of a heat exchanger, and water return pipelines of the two groups of chilled water circulation pipelines are connected with a liquid outlet end of the heat exchanger. According to the gas separation system using the hot gas for refrigeration, high-temperature air is used as a heat source for refrigeration through the compression heat refrigeration system, so that the refrigeration requirement of the gas separation system is met, and the energy consumption of the system is reduced; and meanwhile, the requirement for cooling capacity can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a gas separation system utilizing hot gas for refrigeration. Background Art

[0002] In gas separation technology, air compressors, as the core of the gas source, increase the gas pressure energy, resulting in a significant increase in temperature during the compression process. The mainstream compressor types currently on the market include screw, piston, centrifugal, vane, and scroll types, all of which fall into the category of hot gas compression.

[0003] During the energy conversion process in hot gas compressors, only approximately 20% of the electrical energy is effectively converted into the potential energy of the compressed gas. The remaining 80% is converted into byproducts such as heat and sound energy. To manage this waste heat, systems often integrate interstage cooling devices, transferring the heat energy to the cooling water circulation system, which is ultimately discharged into the atmosphere through cooling towers, resulting in energy loss in the compressed gas production process.

[0004] At the same time, current gas separation systems generally use electric refrigeration technology to maintain system temperature stability. However, this method also has high energy consumption, further increasing the overall energy consumption of the system.

[0005] Therefore, it is necessary to propose a gas separation system that utilizes hot gas refrigeration to solve the above problems. Utility Model Content

[0006] (1) Technical problems solved

[0007] The purpose of the utility model is to provide a gas separation system that utilizes hot gas for refrigeration, so as to solve the problem of high energy consumption of the existing gas separation system proposed in the above background technology.

[0008] (2) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: a gas separation system using hot gas for refrigeration, comprising a gas separation system consisting of an air filter, an air cooler, an air compressor, a purification system, and a distillation tower system, wherein the air filter, air cooler, air compressor, purification system, and distillation tower system are all provided with a heat exchanger, and a compression heat refrigeration system is provided between the air compressor and the purification system, and the compression heat refrigeration system comprises two groups of chilled water circulation pipelines, the water supply pipelines of the two groups of chilled water circulation pipelines are both connected to the liquid inlet end of the heat exchanger, and the return pipelines of the two groups of chilled water circulation pipelines are both connected to the liquid outlet end of the heat exchanger, one group of chilled water circulation pipelines has a temperature gauge on its water supply pipeline and a flow control valve on its water supply pipeline, and the other group of chilled water circulation pipelines has a first buffer tank and a second buffer tank on its water supply pipeline and return pipeline, respectively, and the first buffer tank and the second buffer tank are provided with liquid valves at their inlets and outlets.

[0010] Preferably, the first buffer tank and the second buffer tank are both insulation tanks.

[0011] Preferably, the compression heat refrigeration system is an adsorption waste heat refrigeration system or an absorption waste heat refrigeration system.

[0012] Preferably, a plurality of the heat exchangers are connected in parallel via an infusion pipeline.

[0013] Preferably, the liquid infusion pipeline includes a liquid inlet pipe and a liquid discharge pipe, one end of the liquid inlet pipe is connected to a circulation pump, and one end of the liquid discharge pipe is connected to a cooling tower.

[0014] Preferably, it further comprises a compressed nitrogen system and a compressed oxygen system, and both the compressed nitrogen system and the compressed oxygen system are provided with a heat exchanger.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the present invention provides a gas separation system that utilizes hot gas for refrigeration, which has the following beneficial effects:

[0017] 1. The gas separation system using hot gas for refrigeration sets up a compression heat refrigeration system between the air compressor and the purification system. The compression heat refrigeration system uses high-temperature air as a heat source for refrigeration, reduces the temperature of the high-temperature air, and is also used for the refrigeration needs of the gas separation system itself, reducing system energy consumption.

[0018] 2. The gas separation system using hot gas for refrigeration is equipped with two sets of chilled water circulation pipelines and a first buffer tank and a second buffer tank, which can meet the dynamic fluctuation demand of cooling capacity through their cooperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1Schematic diagram of the gas separation system of the present invention;

[0020] Figure 2 This is a schematic diagram of the compression heat refrigeration system of the present invention.

[0021] In the figure: 1. Air filter; 2. Air cooler; 3. Air compressor; 4. Compression heat refrigeration system; 5. Purification system; 6. Distillation tower system; 7. Nitrogen compression system; 8. Oxygen compression system; 9. Thermometer; 10. Flow control valve; 11. Heat exchanger; 12. Circulation pump; 13. Cooling tower; 14. First buffer tank; 15. Second buffer tank. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] See also Figure 1-2 As shown, a gas separation system using hot gas for refrigeration includes a gas separation system consisting of an air filter 1, an air cooler 2, an air compressor 3, a purification system 5, and a distillation tower system 6. A heat exchanger 11 is provided in the air filter 1, the air cooler 2, the air compressor 3, the purification system 5, and the distillation tower system 6. A compression heat refrigeration system 4 is provided on the gas transmission pipeline between the air compressor 3 and the purification system 5. The compression heat refrigeration system 4 includes two sets of chilled water circulation pipelines. The water supply pipelines of the two sets of chilled water circulation pipelines are connected to the liquid inlet end of the heat exchanger 11, and the return pipelines of the two sets of chilled water circulation pipelines are connected to the liquid outlet end of the heat exchanger 11.

[0024] The high-temperature compressed gas is introduced into the compression heat refrigeration system 4 as a heat source, and the compression heat is used for refrigeration. The chilled water is transported to the heat exchanger 11 of each device through the chilled water circulation pipeline to meet the cooling needs during the production and processing process.

[0025] In order to meet the dynamic fluctuation demand of cooling capacity, a temperature meter 9 is provided on the supply pipe and return pipe of one group of chilled water circulation pipelines, and a flow control valve 10 is provided on the supply pipe. The supply pipe and return pipe of another group of chilled water circulation pipelines are respectively connected to the first buffer tank 14 and the second buffer tank 15. The liquid inlet and outlet of the first buffer tank 14 and the second buffer tank 15 are both provided with liquid valves.

[0026] A thermometer 9 is provided to detect the water temperature difference between the water supply pipe and the return pipe. The flow control valve 10 can be used to adjust the chilled water flow rate to control the water temperature difference between the water supply pipe and the return pipe within a preset range. The first buffer tank 14 can store low-temperature cooling water, and the second buffer tank 15 can store high-temperature chilled water.

[0027] When the cooling demand increases and the refrigeration is insufficient, when the chilled water temperature detected by the thermometer 9 reaches the preset water temperature upper limit, the chilled water flow rate of the chilled water circulation pipeline is reduced through the flow control valve 10, valves c and e are opened, and valves e and f are closed. The chilled water in the first buffer tank 14 is passed to the heat exchanger 11 to meet the cooling demand. Under the premise of satisfying the chilled water circulation, the excess high-temperature chilled water flows into the second buffer tank 15;

[0028] When the cooling capacity required decreases, resulting in excess cooling, and the chilled water temperature detected by the thermometer 9 on the current chilled water circulation pipeline reaches the preset water temperature lower limit, valves c and e are closed, and valves d and f are opened. The high-temperature chilled water in the second buffer tank 15 enters the compression heat refrigeration system 4 through another chilled water circulation pipeline, and after being cooled by the compression heat refrigeration system 4, enters the first buffer tank 14 for storage;

[0029] When the required cooling capacity is balanced with the cooling capacity, valves c, d, e and f are closed, and chilled water is circulated to the heat exchanger 11 through the current chilled water circulation pipeline.

[0030] Among them, the chilled water is pumped by a liquid pump, and low-temperature cooling water and high-temperature chilled water refer to the relative temperatures of the two.

[0031] In order to reduce heat loss, the first buffer tank 14 and the second buffer tank 15 are both heat-insulating tanks. By adopting heat-insulating tanks, the loss of cooling capacity can be reduced.

[0032] Specifically, the compression heat refrigeration system 4 is an adsorption waste heat refrigeration system or an absorption waste heat refrigeration system. Both the adsorption waste heat refrigeration system and the absorption waste heat refrigeration system are existing waste heat refrigeration systems.

[0033] In some embodiments, multiple heat exchangers 11 are connected in parallel via a fluid infusion pipeline.

[0034] Specifically, the liquid delivery pipeline includes a liquid inlet pipe and a liquid discharge pipe. One end of the liquid inlet pipe is connected to the circulation pump 12 , and one end of the liquid discharge pipe is connected to the cooling tower 13 .

[0035] By setting up a circulating pump 12 and a cooling tower 13, when problems such as overload and extreme high temperature occur and lead to insufficient cooling, valves a and valve b are opened, cooling water is pumped into the liquid inlet pipe through the circulating pump 12, and the high-temperature cooling water is discharged into the cooling tower 13 for cooling.

[0036] In some embodiments, a compressed nitrogen system 7 and a compressed oxygen system 8 are further included, and each of the compressed nitrogen system 7 and the compressed oxygen system 8 is provided with a heat exchanger 11. The compressed nitrogen system 7 and the compressed oxygen system 8 are both existing systems.

[0037] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas separation system utilizing hot gas refrigeration, comprising an air filter (1), an air cooler (2), an air compressor (3), a purification system (5), and a fractionation tower system (6), wherein each of the air filter (1), the air cooler (2), the air compressor (3), the purification system (5), and the fractionation tower system (6) is provided with a heat exchanger (11), and characterized in that: A compression heat refrigeration system (4) is provided between the air compressor (3) and the purification system (5), and the compression heat refrigeration system (4) includes two groups of chilled water circulation pipelines, the water supply pipelines of the two groups of chilled water circulation pipelines are connected to the liquid inlet end of the heat exchanger (11), and the return pipelines of the two groups of chilled water circulation pipelines are connected to the liquid outlet end of the heat exchanger (11), a thermometer (9) is provided on the water supply pipeline and the return pipeline of one group of chilled water circulation pipelines, and a flow control valve (10) is provided on the water supply pipeline, and a first buffer tank (14) and a second buffer tank (15) are connected to the water supply pipeline and the return pipeline of the other group of chilled water circulation pipelines, respectively, and the liquid inlet and outlet of the first buffer tank (14) and the second buffer tank (15) are provided with liquid valves.

2. A gas separation system utilizing hot gas refrigeration according to claim 1, characterized in that: The first buffer tank (14) and the second buffer tank (15) are both heat-insulating tanks.

3. The gas separation system utilizing hot gas refrigeration according to claim 1, characterized in that: The compression heat refrigeration system (4) is an adsorption type waste heat refrigeration system or an absorption type waste heat refrigeration system.

4. The gas separation system utilizing hot gas refrigeration according to claim 1, characterized in that: The plurality of heat exchangers (11) are connected in parallel via a liquid infusion pipeline.

5. The gas separation system using hot gas for refrigeration according to claim 4, characterized in that: The liquid delivery pipeline comprises a liquid inlet pipe and a liquid discharge pipe, one end of the liquid inlet pipe is connected to a circulation pump (12), and one end of the liquid discharge pipe is connected to a cooling tower (13).

6. The gas separation system utilizing hot gas refrigeration according to claim 1, characterized in that: It also includes a nitrogen compression system (7) and an oxygen compression system (8), and both the nitrogen compression system (7) and the oxygen compression system (8) are provided with a heat exchanger (11).

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