Regenerative system for gas purification and energy-saving control method thereof

Abstract

The invention discloses a regenerative system for gas purification, and relates to the technical field of gas purification. The system comprises a gas separator heat regeneration system and a drying tower heat regeneration system, the gas separator heat regeneration system comprises a gas separator, and upstream inlet gas sequentially enters a first heat exchange side of a gas heat regenerator matched with the gas separator, the gas separator and a second heat exchange side of the gas heat regenerator matched with the gas separator and then enters the drying tower heat regeneration system. A gas heat regeneration mode is adopted, high-temperature outlet gas is used for preheating low-temperature inlet gas by adopting an efficient heat regenerator, the inlet gas temperature is remarkably increased, the outlet gas temperature is reduced, the electric heating energy consumption and the cooling load are effectively reduced by more than 50%, the energy efficiency level of the purification system is improved, and the operation cost of the purification process is reduced; and multiple purposes of saving energy, saving water and reducing carbon are achieved. The invention further discloses an energy-saving control method of the regenerative system for gas purification.

Description

A gas purification regenerative system and its energy-saving control method Technical Field

[0001] This invention relates to the field of gas purification technology, and more specifically to a regenerative gas purification system. The invention also relates to an energy-saving control method for this regenerative gas purification system. Background Technology

[0002] Gas purification is widely used in air separation and hydrogen production. Large-scale air separation is an important component of pillar industries such as chemical industry, steel industry, and power plant. Hydrogen energy is a clean energy source that the country is vigorously promoting, and green electricity hydrogen production is a new energy consumption method. Currently, policies and the market attach great importance to it, and various projects have been launched one after another. Under the dual carbon background, one of the key technical challenges faced by air separation and green electricity hydrogen production is the energy consumption problem. Various industrial gases, including hydrogen, oxygen, nitrogen, argon, and methane, need to meet different purity requirements and all need to be purified by gas purification equipment.

[0003] Mainstream gas purification typically employs gas separators, drying towers, adsorption, and filtration to achieve gas purification. Gas separators primarily separate impurities from the gas, requiring an electric heater to heat the inlet gas to the catalytic reaction temperature. The outlet gas then enters a cooler for further cooling. Adsorption towers generally employ two or three towers operating alternately for regeneration and adsorption processes. During the regeneration cycle, an electric heater is used to heat the gas to regenerate the adsorbent, followed by blowing to cool the adsorbent, and finally, cooling in a cooler. This process requires significant energy consumption for electric heating and cooling loads, resulting in substantial waste of heat and cold energy.

[0004] Therefore, it is necessary to develop a gas purification regenerative system and its energy-saving control method that effectively reduces electric heating energy consumption and cooling load. Summary of the Invention

[0005] The primary objective of this invention is to overcome the shortcomings of the aforementioned background technology and to provide a regenerative system for gas purification.

[0006] A second objective of this invention is to provide an energy-saving control method for such a gas purification regenerative system.

[0007] To achieve the aforementioned first objective, the technical solution of the present invention is as follows: a gas purification regenerative system, characterized in that it includes a gas separator regenerative system and a drying tower regenerative system. The gas separator regenerative system includes a gas separator. Upstream inlet gas sequentially enters the first heat exchange side of a gas regenerative unit matched with the gas separator, the gas separator, and the second heat exchange side of the gas regenerative unit matched with the gas separator before entering the drying tower regenerative system. The drying tower regenerative system includes three drying towers: one drying tower is in operation, one drying tower is in regeneration heating or regeneration cooling operation, and one drying tower is in adsorption operation. Gas sequentially enters the drying tower in operation, the drying tower in regeneration heating or regeneration cooling operation, and the drying tower in adsorption operation. When gas enters the drying tower in operation, the inlet gas sequentially enters the first heat exchange side of the gas regenerative unit matched with the drying tower in operation, the drying tower in operation, and then enters the downstream gas supply main pipe and the drying tower in regeneration heating or regeneration cooling operation. The drying tower is cold; the exhaust gas does not exchange heat when passing through the gas regenerator matched with the drying tower in the working state; when the gas enters the drying tower in the regeneration heating state, the intake gas sequentially enters the second heat exchange side of the gas regenerator matched with the drying tower in the regeneration heating state, the drying tower in the regeneration heating state, and the first heat exchange side of the gas regenerator matched with the drying tower in the regeneration heating state. After being pre-cooled by the gas regenerator matched with the drying tower in the regeneration heating state, the exhaust gas enters the drying tower in the adsorption state through the upstream gas supply main; when the gas enters the drying tower in the regeneration cooling state, the intake gas sequentially enters the drying tower in the regeneration cooling state, and the first heat exchange side of the gas regenerator matched with the drying tower in the regeneration cooling state. After being naturally cooled by the gas regenerator matched with the drying tower in the regeneration cooling state, the exhaust gas enters the drying tower in the adsorption state through the upstream gas supply main; the working states of the three drying towers switch between working, regeneration heating or regeneration cooling, and adsorption.

[0008] In the above technical solution, the upstream air intake is connected to the gas separator through the first heat exchange side of the first gas regenerator, and the gas separator is connected to the upstream gas supply main pipe in sequence through the second heat exchange side of the first gas regenerator, the first cooler and the first gas-water separator.

[0009] In the above technical solution, the drying tower regenerative system includes a first drying tower, a second drying tower, and a third drying tower; a second gas regenerator matched with the first drying tower; a third gas regenerator matched with the second drying tower; and a fourth gas regenerator matched with the third drying tower. The upstream gas supply main pipe is connected to one end of the first heat exchange side of the second gas regenerator via a second gas-water separator and a second cooler. The other end of the first heat exchange side of the second gas regenerator is connected to the first drying tower. The upstream gas supply main pipe is connected to one end of the first heat exchange side of the third gas regenerator via a third gas-water separator and a third cooler. The other end of the first heat exchange side of the third gas regenerator is connected to the second drying tower. The upstream gas supply main pipe is connected to one end of the first heat exchange side of the fourth gas regenerator via a fourth gas-water separator and a fourth cooler. The other end of the first heat exchange side of the fourth gas regenerator is connected to the third drying tower. In the above technical solution, the first drying tower... The first drying tower is connected to the downstream gas supply main pipe through a first electric valve and a first three-way valve. The first drying tower is connected to one end of the second heat exchange side of the second gas regenerator through a first electric valve and a second electric valve. The first drying tower is connected to the other end of the second heat exchange side of the second gas regenerator through a first electric valve and a third electric valve. The second drying tower is connected to the downstream gas supply main pipe through a fourth electric valve and a second three-way valve. The second drying tower is connected to one end of the second heat exchange side of the third gas regenerator through a fourth electric valve and a fifth electric valve. The second drying tower is connected to the other end of the second heat exchange side of the third gas regenerator through a fourth electric valve and a sixth electric valve. The third drying tower is connected to the downstream gas supply main pipe through a seventh electric valve and a third three-way valve. The third drying tower is connected to one end of the second heat exchange side of the fourth gas regenerator through a seventh electric valve and an eighth electric valve. The third drying tower is connected to the other end of the second heat exchange side of the fourth gas regenerator through a seventh electric valve and a ninth electric valve.

[0010] In the above technical solution, when the first drying tower is in the working, regeneration cooling, and adsorption states, the first electric valve is open, and the second and third electric valves are closed; when the first drying tower is in the regeneration heating state, the first electric valve is closed, and the second and third electric valves are open; when the second drying tower is in the working, regeneration cooling, and adsorption states, the fourth electric valve is open, and the fifth and sixth electric valves are closed; when the second drying tower is in the regeneration heating state, the fourth electric valve is closed, and the fifth and sixth electric valves are open; when the third drying tower is in the working, regeneration cooling, and adsorption states, the seventh electric valve is open, and the eighth and ninth electric valves are closed; when the third drying tower is in the regeneration heating state, the seventh electric valve is closed, and the eighth and ninth electric valves are open.

[0011] In the above technical solution, the downstream gas supply pipe is connected to the gas filter and then enters the downstream.

[0012] To achieve the second objective mentioned above, the technical solution of the present invention is as follows: an energy-saving control method for a gas purification regenerative system, characterized by comprising the following steps: Step 1: The upstream inlet gas exchanges heat with the outlet gas of the first gas regenerator and the gas separator. The preheated gas enters the gas separator for catalytic reaction to remove gas impurities. The outlet gas of the gas separator is pre-cooled and then enters the first cooler for further cooling, and then enters the upstream gas supply main pipe through the first gas-water separator; Step 2: The drying tower in the working state is the first drying tower, the drying tower in the working state of regeneration heating or regeneration blowing cooling is the second drying tower, and the drying tower in the working state of adsorption is the third drying tower; the gas sequentially passes through the second gas-water separator and the second cooler, and enters the first drying tower through the second gas regenerator without heat exchange. At this time, the second electric valve and the third electric valve are closed, the first electric valve is opened, and the gas enters the downstream gas supply main pipe from the first drying tower through the first three-way valve; Step 3: When the regenerated gas is regenerated and heated through the second three-way valve, this When the fourth electric valve is closed and the fifth and sixth electric valves are open, the regenerated gas enters the second drying tower after being preheated by the third gas regenerator. The gas from the second drying tower enters the third cooler after being precooled by the third gas regenerator, and then enters the upstream gas supply main pipe through the third gas-water separator. When the regenerated gas is regenerated and cooled by the second three-way valve, the fifth and sixth electric valves are closed and the fourth electric valve is open. The gas enters the second drying tower through the second three-way valve. The gas from the second drying tower enters the third cooler after being naturally cooled by the third gas regenerator, and then enters the upstream gas supply main pipe through the third gas-water separator. Step 4: The regenerated gas enters the fourth cooler after passing through the fourth gas-water separator. The gas enters the third drying tower without heat exchange after passing through the fourth gas regenerator. At this time, the eighth and ninth electric valves are closed and the seventh electric valve is open. The gas after adsorption is completed flows into the downstream gas supply main pipe through the third three-way valve. Step 5: The collected gas enters the gas filter, and the purified finished gas enters the downstream.

[0013] Compared with the prior art, the present invention has the following advantages: 1) The present invention adopts a gas reheating method and uses a high-efficiency reheater to preheat the low-temperature inlet gas with high-temperature outlet gas, which significantly increases the inlet gas temperature and reduces the outlet gas temperature, effectively reducing the electric heating energy consumption and cooling load by more than 50%, improving the energy efficiency level of the purification system, reducing the operating cost of the purification process, and achieving multiple purposes of energy saving, water saving and carbon reduction.

[0014] 2) This invention reduces the energy consumption of electric heating and the cooling load, allowing for a reduction in the size of the drying tower and cooler, as well as the size and power of the electric heater. It also reduces the flow rate and energy consumption of the cooling medium. To a certain extent, it reduces the size of the gas separator, drying tower, electric heater, and cooler, while adding a gas regenerator and pipeline valves. This results in a certain reduction in the overall cost of the purification equipment, saving on initial investment.

[0015] 3) This invention uses a control system to change the switching of electric valves, the power of electric heaters, the flow rate of cooler medium, etc., so as to achieve normal purification operation of the three towers while reducing the energy consumption of electric heating and the cooling load.

[0016] 4) This invention adjusts the electric heater power based on the inlet temperature of the gas regenerator corresponding to the gas separator, and adjusts the cooling load based on the outlet temperature; it controls the switching of the corresponding gas regenerator pipeline according to the working cycle of the drying tower. When the drying tower is in working, adsorption, and regeneration cooling states, the electric valve is controlled to open and close, allowing the inlet gas to enter the drying tower directly without passing through the gas regenerator. The outlet gas of the drying tower is naturally cooled by the gas regenerator and then enters the cooler. The cooling load is adjusted based on the outlet temperature of the cooler. When the drying tower is in regeneration heating state, the electric valve is controlled to open and close, allowing the inlet gas to be preheated by the gas regenerator before entering the drying tower for electric supplementary heating. The electric heater power is controlled based on the feedback from the thermometer inside the drying tower. After the outlet gas of the drying tower enters the gas regenerator and exchanges heat with the inlet gas for pre-cooling, it enters the cooler for further cooling. The cooling load is adjusted based on the outlet temperature of the cooler. This invention can handle various working conditions. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the structure of the present invention.

[0018] Among them, 1-gas separator, 2A-first drying tower, 2B-second drying tower, 2C-third drying tower, 21-first electric valve, 22-second electric valve, 23-third electric valve, 24-fourth electric valve, 25-fifth electric valve, 26-sixth electric valve, 27-seventh electric valve, 28-eighth electric valve, 29-ninth electric valve, 30-first gas regenerator, 3A-second gas regenerator, 3B-third gas regenerator, 3C-fourth gas regenerator, 40-first cooler, 4A-second cooler, 4B-third cooler, 4C-fourth gas-liquid separator, 50-first gas-liquid separator, 5A-second gas-liquid separator, 5B-third gas-liquid separator, 5C-fourth cooler, 61-first three-way valve, 62-second three-way valve, 63-third three-way valve, 7-gas filter. Detailed Implementation

[0019] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but these descriptions are not intended to limit the invention and are merely illustrative. The advantages of the present invention will become clearer and easier to understand through this description.

[0020] Referring to the attached figures, a gas purification regenerative system utilizes a regenerative method to fully recycle and reuse the waste heat from the gas separator and drying tower of the purification system. Without increasing external energy, it achieves the simultaneous heating and cooling required by the gas purification system through heat transfer and recovery. The system includes a gas separator regenerative system and a drying tower regenerative system. The gas separator regenerative system includes a gas separator 1. Upstream gas sequentially enters the first heat exchange side of a gas regenerative unit matched with the gas separator 1, then the gas separator 1, and the second heat exchange side of the same gas regenerative unit before entering the drying tower regenerative system. The drying tower regenerative system includes three drying towers: one in operation, one in regeneration heating or regeneration cooling, and one in adsorption. Gas sequentially enters the operating drying tower, the regeneration heating or regeneration cooling drying tower, and the adsorption drying tower. When gas enters the operating drying tower, the inlet gas sequentially enters the first heat exchange side of the gas regenerative unit matched with that tower, and the drying tower... After the drying tower is in operation, the gas enters the downstream gas supply main pipe and the drying tower in regenerative heating or regenerative cooling operation. The outlet gas does not exchange heat when passing through the gas regenerator matched with the operating drying tower. When the gas enters the drying tower in regenerative heating operation, the inlet gas sequentially enters the second heat exchange side of the gas regenerator matched with the operating drying tower in regenerative heating operation, the operating drying tower in regenerative heating operation, and the first heat exchange side of the gas regenerator matched with the operating drying tower in regenerative heating operation. The outlet gas passes through the gas regenerator matched with the operating drying tower in regenerative heating operation. After being pre-cooled by the gas regenerator matched with the drying tower, the gas enters the drying tower in the adsorption mode through the upstream gas supply main pipe. When the gas enters the drying tower in the regeneration cooling mode, the inlet gas sequentially enters the drying tower in the regeneration cooling mode and the first heat exchange side of the gas regenerator matched with the drying tower in the regeneration cooling mode. The outlet gas is naturally cooled by the gas regenerator matched with the drying tower in the regeneration cooling mode and then enters the drying tower in the adsorption mode through the upstream gas supply main pipe. The operating modes of the three drying towers switch between working, regeneration heating or regeneration cooling, and adsorption.

[0021] The upstream intake air is connected to the gas separator 1 through the first heat exchange side of the first gas regenerator 30. The gas separator 1 is connected to the upstream gas supply main pipe through the second heat exchange side of the first gas regenerator 30, the first cooler 40 and the first gas-water separator 50 in sequence.

[0022] The drying tower regenerative system includes a first drying tower 2A, a second drying tower 2B, and a third drying tower 2C; a second gas regenerator 3A matched with the first drying tower 2A; a third gas regenerator 3B matched with the second drying tower 2B; and a fourth gas regenerator 3C matched with the third drying tower 2C. The upstream gas supply main pipe is connected to one end of the first heat exchange side of the second gas regenerator 3A via a second gas-water separator 5A and a second cooler 4A. The other end of the first heat exchange side of the second gas regenerator 3A is connected to the first drying tower 2A. The main gas supply pipe is connected to one end of the first heat exchange side of the third gas regenerator 3B via the third gas-water separator 5B and the third cooler 4B in sequence; the other end of the first heat exchange side of the third gas regenerator 3B is connected to the second drying tower 2B; the upstream main gas supply pipe is connected to one end of the first heat exchange side of the fourth gas regenerator 3C via the fourth gas-water separator 5C and the fourth cooler 4C in sequence; the other end of the first heat exchange side of the fourth gas regenerator 3C is connected to the third drying tower 2C; the first drying tower 2A is connected to the first electric valve 21 and the first three-way valve. Valve 61 is connected to the downstream gas supply main pipe. The first drying tower 2A is connected to one end of the second heat exchange side of the second gas regenerator 3A through the first electric valve 21 and the second electric valve 22. The first drying tower 2A is connected to the other end of the second heat exchange side of the second gas regenerator 3A through the first electric valve 21 and the third electric valve 23. The second drying tower 2B is connected to the downstream gas supply main pipe through the fourth electric valve 24 and the second three-way valve 62. The second drying tower 2B is connected to the second heat exchange side of the third gas regenerator 3B through the fourth electric valve 24 and the fifth electric valve 25. One end is connected, and the second drying tower 2B is connected to the other end of the second heat exchange side of the third gas regenerator 3B through the fourth electric valve 24 and the sixth electric valve 26; the third drying tower 2C is connected to the downstream gas supply main pipe through the seventh electric valve 27 and the third three-way valve 63, and the third drying tower 2C is connected to one end of the second heat exchange side of the fourth gas regenerator 3C through the seventh electric valve 27 and the eighth electric valve 28, and the third drying tower 2C is connected to the other end of the second heat exchange side of the fourth gas regenerator 3C through the seventh electric valve 27 and the ninth electric valve 29.

[0023] When the first drying tower 2A is in the working, regeneration cooling, and adsorption state, the first electric valve 21 is open, and the second electric valve 22 and the third electric valve 23 are closed; when the first drying tower 2A is in the regeneration heating state, the first electric valve 21 is closed, and the second electric valve 22 and the third electric valve 23 are open; when the second drying tower 2B is in the working, regeneration cooling, and adsorption state, the fourth electric valve 24 is open, and the fifth electric valve 25 and the sixth electric valve 26 are closed; when the second drying tower 2B is in the regeneration heating state, the fourth electric valve 24 is closed, and the fifth electric valve 25 and the sixth electric valve 26 are open; when the third drying tower 2C is in the working, regeneration cooling, and adsorption state, the seventh electric valve 27 is open, and the eighth electric valve 28 and the ninth electric valve 29 are closed; when the third drying tower 2C is in the regeneration heating state, the seventh electric valve 27 is closed, and the eighth electric valve 28 and the ninth electric valve 29 are open.

[0024] The downstream gas supply pipe is connected to the gas filter 7 and then enters the downstream section.

[0025] An energy-saving control method for a gas purification regenerative system, characterized by the following steps: Step 1: The upstream inlet gas exchanges heat with the outlet gas of the gas separator 1 via the first gas regenerator 30. The preheated gas enters the gas separator 1 for catalytic reaction to remove gas impurities. The outlet gas of the gas separator 1 is pre-cooled and then enters the first cooler 40 for further cooling, and then enters the upstream gas supply main pipe via the first gas-water separator 50; Step 2: The drying tower in working state is the first drying tower 2A, and the drying tower in working state of regeneration heating or regeneration blowing cooling is the second drying tower 2A. The second drying tower 2B operates as an adsorption drying tower, while the third drying tower 2C operates as an adsorption drying tower. Gas sequentially passes through the second gas-liquid separator 5A and the second cooler 4A, then through the second gas regenerator 3A without heat exchange, before entering the first drying tower 2A. At this time, the second electric valve 22 and the third electric valve 23 are closed, and the first electric valve 21 is open. Gas flows from the first drying tower 2A through the first three-way valve 61 into the downstream gas supply main pipe. Step 3: When the regenerated gas undergoes regeneration heating via the second three-way valve 62, the fourth electric valve 24 is closed, and the fifth electric valve 25 and the third electric valve 26 are open. When the sixth electric valve 26 is opened, the regenerated gas, after being preheated by the third gas regenerator 3B, enters the second drying tower 2B. The gas exiting the second drying tower 2B, after being precooled by the third gas regenerator 3B, enters the third cooler 4B, and then passes through the third gas-water separator 5B to enter the upstream gas supply main pipe. When the regenerated gas undergoes regeneration cooling through the second three-way valve 62, the fifth electric valve 25 and the sixth electric valve 26 are closed, and the fourth electric valve 24 is opened. The gas enters the second drying tower 2B from the second three-way valve 62, and the gas exiting the second drying tower 2B passes through the third gas regenerator 3B. After cooling, the gas enters the third cooler 4B, and then the third gas-water separator 5B before entering the upstream gas supply main pipe; Step 4: The regenerated gas enters the fourth cooler 4C after passing through the fourth gas-water separator 5C. The gas then enters the third drying tower 2C without heat exchange after passing through the fourth gas regenerator 3C. At this time, the eighth electric valve 28 and the ninth electric valve 29 are closed, and the seventh electric valve 27 is opened. After adsorption, the gas flows into the downstream gas supply main pipe through the third three-way valve 63; Step 5: The collected gas enters the gas filter 7, and the purified finished gas enters the downstream.

[0026] In practical use, the gas separator reheat system also includes gas pipeline valves and instruments; the drying tower reheat system also includes gas pipeline valves and instruments; the control system includes a distributed or centralized control system, an electric heating controller, a cooler flow regulating valve, pipeline electric valves, thermometers, and pressure gauges.

[0027] The outlet of the gas separator reheating system is connected to the inlet of the drying tower reheating system; the control system controls the operation of the entire gas purification unit, including the gas separator reheating system and the drying tower reheating system.

[0028] The gas regenerator is used to preheat the low-temperature inlet gas from the high-temperature outlet gas of the gas separator 1 and the drying tower. The gas regenerator adopts one or more of the following heat exchangers: shell and tube, finned, plate, and combined, which is determined based on a comprehensive consideration of temperature, efficiency, and cost. The gas regenerator uses countercurrent heat exchange for the inlet and outlet gas, and adopts one or more of the following methods: single-stage or multi-stage series and parallel connection, which is determined based on a comprehensive consideration of temperature, efficiency, and cost. When not performing heat exchange, the gas regenerator is used only as an air cooler for natural cooling, which can reduce the cooler load to a certain extent.

[0029] Adjusting the cooler load is mainly achieved by controlling the cooler medium flow rate through the opening of an electric regulating valve. While reducing the cooling load, the cooling water flow rate will also decrease, which will reduce the power consumption of the cooling water pump and cooling tower, and decrease the system water replenishment, thus achieving the purpose of energy saving and water saving.

[0030] Under typical operating conditions, the inlet temperature of both the gas separator 1 and the drying tower is 40°C, the electric heating temperature is 200°C, and the outlet temperature of both the gas separator 1 and the drying tower is 180°C. After adding a high-efficiency regenerator and an energy-saving control system, the inlet temperature of both the gas separator 1 and the drying tower can be reduced to above 160°C by waste heat, and the outlet temperature of both the gas separator 1 and the drying tower can be pre-cooled to 60°C. Under these conditions, considering that the actual temperature may deviate from the set temperature, the electric heating energy consumption of the gas separator 1 and the drying tower (regeneration tower) can be reduced by more than 50%, and the load on the cooler is also reduced by more than 50%.

[0031] The control system includes thermometers, pressure gauges, flow meters, electric valves, and electric heating power controllers, all of which can be controlled by a distributed or centralized system.

[0032] All other unspecified parts belong to the prior art.

Claims

1. A regenerative system for gas purification, characterized in that: The system includes a gas separator reheating system and a drying tower reheating system. The gas separator reheating system includes a gas separator (1). Upstream gas enters sequentially through the first heat exchange side of a gas reheater matched with the gas separator (1), the gas separator (1), and the second heat exchange side of the gas reheater matched with the gas separator (1) before entering the drying tower reheating system. The drying tower reheating system includes three drying towers: one drying tower is in operation, one drying tower is in regeneration heating or regeneration cooling, and one drying tower is in adsorption mode. Gas enters sequentially through the drying tower in operation, the drying tower in regeneration heating or regeneration cooling mode, and the drying tower in adsorption mode. When gas enters the drying tower in operation, the gas enters sequentially through the first heat exchange side of a gas reheater matched with the drying tower in operation, the drying tower in operation, and then the downstream gas supply main and the drying tower in regeneration heating or regeneration cooling mode. The outflow gas passes through the drying tower in operation. When the gas regenerator matched with the drying tower is in working condition, no heat exchange occurs. When gas enters the drying tower in regenerative heating condition, the inlet gas sequentially enters the second heat exchange side of the gas regenerator matched with the drying tower in regenerative heating condition, the drying tower in regenerative heating condition, and the first heat exchange side of the gas regenerator matched with the drying tower in regenerative heating condition. The outlet gas is pre-cooled by the gas regenerator matched with the drying tower in regenerative heating condition and then enters the drying tower in adsorption condition through the upstream gas supply main. When gas enters the drying tower in regenerative cooling condition, the inlet gas sequentially enters the drying tower in regenerative cooling condition and the first heat exchange side of the gas regenerator matched with the drying tower in regenerative cooling condition. The outlet gas is naturally cooled by the gas regenerator matched with the drying tower in regenerative cooling condition and then enters the drying tower in adsorption condition through the upstream gas supply main. The working conditions of the three drying towers switch between working, regenerative heating or regenerative cooling, and adsorption.

2. The gas purification regenerative system according to claim 1, characterized in that: The upstream intake gas is connected to the gas separator (1) through the first heat exchange side of the first gas regenerator (30). The gas separator (1) is connected to the upstream gas supply main pipe in sequence through the second heat exchange side of the first gas regenerator (30), the first cooler (40) and the first gas-water separator (50).

3. The gas purification regenerative system according to claim 2, characterized in that: The drying tower regeneration system includes a first drying tower (2A), a second drying tower (2B), and a third drying tower (2C), a second gas regenerator (3A) matched with the first drying tower (2A), a third gas regenerator (3B) matched with the second drying tower (2B), and a fourth gas regenerator (3C) matched with the third drying tower (2C); the upstream gas supply main pipe is connected to one end of the first heat exchange side of the second gas regenerator (3A) via a second gas-water separator (5A) and a second cooler (4A); the other end of the first heat exchange side of the second gas regenerator (3A) is connected to... The first drying tower (2A) is connected; the upstream gas supply main pipe is connected to one end of the first heat exchange side of the third gas regenerator (3B) via the third gas-water separator (5B) and the third cooler (4B); the other end of the first heat exchange side of the third gas regenerator (3B) is connected to the second drying tower (2B); the upstream gas supply main pipe is connected to one end of the first heat exchange side of the fourth gas regenerator (3C) via the fourth gas-water separator (5C) and the fourth cooler (4C); the other end of the first heat exchange side of the fourth gas regenerator (3C) is connected to the third drying tower (2C).

4. The gas purification regenerative system according to claim 2, characterized in that: The first drying tower (2A) is connected to the downstream gas supply main pipe through the first electric valve (21) and the first three-way valve (61). The first drying tower (2A) is connected to one end of the second heat exchange side of the second gas regenerator (3A) through the first electric valve (21) and the second electric valve (22). The first drying tower (2A) is connected to the other end of the second heat exchange side of the second gas regenerator (3A) through the first electric valve (21) and the third electric valve (23). The second drying tower (2B) is connected to the downstream gas supply main pipe through the fourth electric valve (24) and the second three-way valve (62). The second drying tower (2B) is connected to the third gas supply main pipe through the fourth electric valve (24) and the fifth electric valve (25). One end of the second heat exchange side of the gas regenerator (3B) is connected, and the second drying tower (2B) is connected to the other end of the second heat exchange side of the third gas regenerator (3B) through the fourth electric valve (24) and the sixth electric valve (26); the third drying tower (2C) is connected to the downstream gas supply main pipe through the seventh electric valve (27) and the third three-way valve (63), and the third drying tower (2C) is connected to one end of the second heat exchange side of the fourth gas regenerator (3C) through the seventh electric valve (27) and the eighth electric valve (28), and the third drying tower (2C) is connected to the other end of the second heat exchange side of the fourth gas regenerator (3C) through the seventh electric valve (27) and the ninth electric valve (29).

5. The gas purification regenerative system according to claim 3, characterized in that: When the first drying tower (2A) is in the working, regeneration cooling, and adsorption states, the first electric valve (21) is open, and the second electric valve (22) and the third electric valve (23) are closed; when the first drying tower (2A) is in the regeneration heating state, the first electric valve (21) is closed, and the second electric valve (22) and the third electric valve (23) are open; when the second drying tower (2B) is in the working, regeneration cooling, and adsorption states, the fourth electric valve (24) is open, and the fifth electric valve (25) and the sixth electric valve (26) are open. When the second drying tower (2B) is in the regeneration heating state, the fourth electric valve (24) is closed, and the fifth electric valve (25) and the sixth electric valve (26) are open; when the third drying tower (2C) is in the working, regeneration cooling and adsorption state, the seventh electric valve (27) is open, and the eighth electric valve (28) and the ninth electric valve (29) are closed; when the third drying tower (2C) is in the regeneration heating state, the seventh electric valve (27) is closed, and the eighth electric valve (28) and the ninth electric valve (29) are open.

6. The gas purification regenerative system according to claim 5, characterized in that: The downstream gas supply pipe is connected to the gas filter (7) and then enters the downstream.

7. The energy-saving control method for a gas purification regenerative system according to claim 6, characterized in that, The process includes the following steps: Step 1: The upstream inlet gas exchanges heat with the outlet gas of the gas separator (1) through the first gas regenerator (30). The preheated gas enters the gas separator (1) for catalytic reaction to remove gas impurities. The outlet gas of the gas separator (1) is pre-cooled and then enters the first cooler (40) for further cooling. It then enters the upstream gas supply main pipe through the first gas-water separator (50); Step 2: The drying tower in working state is the first drying tower (2A), the drying tower in working state of regeneration heating or regeneration blowing cooling is the second drying tower (2B), and the drying tower in working state of adsorption is the third drying tower (2A). C); The gas passes sequentially through the second gas-water separator (5A) and the second cooler (4A), and then through the second gas regenerator (3A) without heat exchange before entering the first drying tower (2A). At this time, the second electric valve (22) and the third electric valve (23) are closed, and the first electric valve (21) is opened. The gas enters the downstream gas supply main pipe from the first drying tower (2A) through the first three-way valve (61); Step 3: When the regenerated gas is regenerated and heated through the second three-way valve (62), the fourth electric valve (24) is closed, and the fifth electric valve (25) and the sixth electric valve (26) are opened. The regenerated gas passes through the second three-way valve (62) and enters the downstream gas supply main pipe. After being preheated by the three-gas regenerator (3B), the gas enters the second drying tower (2B). The gas from the second drying tower (2B) is precooled by the third gas regenerator (3B) and then enters the third cooler (4B), and then enters the upstream gas supply main pipe through the third gas-water separator (5B). When the regenerated gas is regenerated and cooled by the second three-way valve (62), the fifth electric valve (25) and the sixth electric valve (26) are closed, and the fourth electric valve (24) is opened. The gas enters the second drying tower (2B) from the second three-way valve (62). The gas from the second drying tower (2B) is naturally cooled by the third gas regenerator (3B) and then enters the third cooling tower (4B). Step 4: The regenerated gas enters the fourth cooler (4C) after passing through the fourth gas-water separator (5B), and then enters the third gas drying tower (2C) without heat exchange. At this time, the eighth electric valve (28) and the ninth electric valve (29) are closed, and the seventh electric valve (27) is opened. After the adsorption is completed, the gas enters the downstream gas supply main pipe through the third three-way valve (63). Step 5: The collected gas enters the gas filter (7), and the purified finished gas enters the downstream.

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