Method for controlling the regeneration heating in a gas purification process and electrolysis gas purification system

Abstract

This invention discloses a method for controlling regeneration heating in a gas purification process and an electrolytic gas purification system. The method for controlling regeneration heating in the gas purification process includes: step S100, controlling the regeneration heater to regenerate and heat the gas entering the regeneration heater at a preset power; step S200, obtaining the water content at the outlet of the gas-liquid separator, and controlling the regeneration heater to stop working when the obtained water content at the outlet of the gas-liquid separator is within a preset threshold range. This invention can solve the problem of increased energy consumption caused by uneconomical control of the regeneration heater.

Description

Technical Field

[0001] This invention relates to the field of electrolysis system technology, and in particular to a method for controlling regeneration heating in a gas purification process and an electrolytic gas purification system. Background Technology

[0002] In existing electrolytic gas purification systems, the regeneration heater uses electricity or other energy sources to desorb moisture from the molecular sieve inside the regeneration tower at high temperatures.

[0003] In current regeneration heater control schemes, the regeneration heater starts when the adsorption tower enters the regeneration state, heating a portion of the gas in the tower to desorb moisture from the molecular sieve. Once the outlet temperature of the regeneration tower reaches a certain level, the regeneration heater stops operating, and the remaining gas from the adsorption tower continues to cool the tower to near room temperature. However, in this control scheme, the regeneration heater stops operating based on the outlet temperature reaching a certain value. During the process, it's impossible to accurately determine whether high-temperature desorption of the molecular sieve inside the regeneration tower has ended, leading to either insufficient or excessive desorption. This affects the regeneration effect, the lifespan of the molecular sieve, and can even increase regeneration energy consumption. Furthermore, during the electrolysis process in the electrolyzer, there are variable power conditions, meaning the electrolysis power of the electrolyzer changes. However, currently, in gas purification, regardless of whether the electrolysis power changes, the regeneration heater in the purification system operates at full power and does not adjust accordingly, thus increasing energy consumption during the regeneration process. Summary of the Invention

[0004] The main objective of this invention is to propose a control method for regeneration heating in a gas purification process, aiming to solve the problem of increased energy consumption caused by uneconomical control of the regeneration heater.

[0005] To achieve the above objectives, the present invention proposes a method for controlling regeneration heating in a gas purification process, applied to an electrolytic gas purification system. The electrolytic gas purification system includes a regeneration heater, a drying unit, and a gas-liquid separator. The regeneration heater and the gas-liquid separator are respectively connected to the drying unit, and the method includes:

[0006] Control the regeneration heater to regenerate and heat the gas entering the regeneration heater at a preset power;

[0007] The moisture content at the outlet of the gas-water separator is obtained, and when the obtained moisture content at the outlet of the gas-water separator is within a preset threshold range, the regeneration heater is controlled to stop working.

[0008] Optionally, before the step of controlling the regeneration heater to regenerate and heat the gas entering the regeneration heater at a preset power, the method further includes:

[0009] Obtain the electrolysis power of the electrolytic cell;

[0010] Obtain the preset regeneration heating time, and determine the preset power of the regeneration heater based on the electrolysis power of the electrolytic cell and the preset regeneration heating time.

[0011] Optionally, the method for controlling regeneration heating in the gas purification process further includes:

[0012] Obtain the preset regenerated gas flow rate value and the real-time regenerated gas flow rate value, and adjust the opening of the regenerated gas flow control valve according to the preset regenerated gas flow rate value so that the real-time regenerated gas flow rate is within the preset regenerated gas flow rate range.

[0013] Optionally, the step of obtaining the preset regeneration gas flow rate value specifically includes:

[0014] Obtain the electrolysis power of the electrolyzer and determine the preset regeneration gas flow rate value based on the electrolysis power of the electrolyzer.

[0015] The present invention also proposes an electrolytic gas purification system, the electrolytic gas purification system comprising:

[0016] Output module;

[0017] A drying unit is connected to the output module via a first pipe, and the drying unit is used to dry the gas;

[0018] A regeneration heater and a gas-liquid separator are respectively connected to the drying unit;

[0019] A regenerated gas flow control valve is installed on the first pipeline;

[0020] A moisture analyzer is installed between the gas-liquid separator and the drying unit;

[0021] The controller is connected to the regeneration heater, the regeneration gas flow control valve and the moisture analyzer respectively. The controller stores a regeneration heating control program. When the controller executes the regeneration heating control program, it implements the regeneration heating control method in the gas purification process described above.

[0022] Optionally, the controller is specifically used to obtain the moisture content at the outlet of the gas-water separator through the moisture analyzer, control the regeneration heater to regenerate and heat the gas entering the regeneration heater at a preset power, and adjust the opening of the regeneration gas flow control valve.

[0023] Optionally, the drying unit is connected to the regeneration heater via a second pipe and a third pipe, and the drying unit is connected to the gas-liquid separator via a fourth pipe and a fifth pipe;

[0024] The electrolytic gas purification system also includes a gas-liquid separation unit, which is connected to the electrolytic cell and is connected to the drying unit through a sixth pipe. The gas-liquid separation unit is used to separate the gas-liquid mixture generated in the electrolytic cell and then output it to the drying unit.

[0025] Optionally, there may be multiple drying units, which may be connected in parallel.

[0026] Optionally, the regeneration heater is disposed within the drying unit, and the drying unit is connected to the gas-liquid separator via a second pipe;

[0027] The electrolytic gas purification system further includes a gas-liquid separation unit, which is connected to the electrolytic cell and is connected to the gas-water separator via a third pipeline. The gas-liquid separation unit is used to separate the gas-liquid mixture generated in the electrolytic cell and then output it to the gas-water separator.

[0028] Optionally, the drying unit and the gas-liquid separator are connected in series to form a drying module, and there are multiple drying modules connected in parallel.

[0029] Optionally, the electrolytic gas purification system further includes:

[0030] The regeneration gas flow meter is connected to the drying module and the first pipeline, and is also connected to the controller. The regeneration gas flow meter is used to detect the regeneration gas flow and output it to the controller.

[0031] Optionally, the electrolytic gas purification system further includes:

[0032] A heat exchanger is provided between the drying unit and the gas-liquid separator. The heat exchanger is used to treat the regeneration gas output from the drying unit by exchanging heat before sending it to the gas-liquid separator; or...

[0033] The regenerated gas output from the gas-water separator is heat-exchanged and then sent to the drying unit.

[0034] In this invention, during the regeneration heating and desorption of the regenerated gas, the regeneration heater is controlled to heat the regenerated gas entering the regeneration heater at a preset power to perform regeneration heating and desorption. Based on the obtained water content at the gas-liquid separator outlet, when the water content at the gas-liquid separator outlet is within a preset threshold range, that is, when the water content at the gas-liquid separator outlet reaches a stable level, the gas regeneration and desorption process is considered complete, and at this point, the regeneration heater is controlled to stop working. This invention replaces the regeneration tower outlet temperature as the criterion for determining the completion of regeneration and desorption with the water content at the gas-liquid separator outlet. By accurately determining the time point at which high-temperature regeneration ends, it avoids insufficient or excessive desorption of the regenerated gas, which could affect the regeneration effect, the lifespan of the molecular sieve, and even increase regeneration energy consumption. This saves regeneration energy in the electrolytic gas purification system, protects the molecular sieve, and further improves regeneration efficiency. Furthermore, the technical solution of this invention can also adjust the regeneration flow rate according to the power of the electrolytic cell, and adjust the working power of the regeneration heater accordingly, so that the working power of the regeneration heater can be adjusted with the change of the power of the electrolytic cell, so that the working power of the regeneration heater matches the power of the electrolytic cell, eliminating the need for regeneration heating at a constant power, thereby enabling the regeneration heating and desorption of the regeneration gas with the most energy-saving method, saving the regeneration energy consumption of the electrolytic gas purification system. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0036] Figure 1 This is a schematic flowchart of an embodiment of the regeneration heating control method in the gas purification process of the present invention;

[0037] Figure 2 This is a detailed flow diagram of an embodiment of the regeneration heating control method in the gas purification process of the present invention;

[0038] Figure 3 This is a detailed flowchart illustrating another embodiment of the regeneration heating control method in the gas purification process of the present invention.

[0039] Figure 4 This is a schematic diagram of an embodiment of the electrolytic gas purification system of the present invention;

[0040] Figure 5 This is a schematic diagram of another embodiment of the electrolytic gas purification system of the present invention.

[0041] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0044] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0045] Currently, in the existing control scheme for regeneration heaters, the regeneration heater starts when the adsorption tower enters the regeneration state. It heats a portion of the gas in the adsorption tower to desorb moisture from the molecular sieve. Once the outlet temperature of the regeneration tower reaches a certain level, the regeneration heater stops working and continues to cool the tower to near room temperature using a portion of the gas from the adsorption tower. However, in this control scheme, the regeneration heater stops working based on the outlet temperature reaching a certain value. During the process, it's impossible to accurately determine whether the high-temperature desorption of the molecular sieve inside the regeneration tower has ended. Therefore, there is a risk of insufficient or excessive desorption, which affects the regeneration effect, the lifespan of the molecular sieve, and may even increase regeneration energy consumption.

[0046] To address the aforementioned problems, this invention proposes a method for controlling regeneration heating in a gas purification process, applied to an electrolytic gas purification system. The electrolytic gas purification system includes a regeneration heater, a drying unit, and a gas-liquid separator. The regeneration heater and the gas-liquid separator are respectively connected to the drying unit. (Refer to...) Figure 1 In one embodiment, it includes:

[0047] Step S100: Control the regeneration heater to regenerate and heat the gas entering the regeneration heater at a preset power.

[0048] Step S200: Obtain the water content at the outlet of the gas-water separator. When the obtained water content at the outlet of the gas-water separator is within a preset threshold range, control the regeneration heater to stop working.

[0049] In this embodiment, a processor, such as an MCU, DSP (Digital Signal Processor), or FPGA (Field Programmable Gate Array), can be provided to control the regeneration heater, such as to control the operation / stop of the regeneration heater and to obtain the water content at the outlet of the gas-water separator.

[0050] Understandably, before controlling the regenerative heater to work, the processor can either call the pre-stored operating power of the regenerative heater to control the regenerative heater to start working at the preset power, or it can obtain other parameters, such as heating time, and then determine the operating power of the regenerative heater, i.e. the preset power, based on the obtained other parameters, and control the regenerative heater to start working at the preset power.

[0051] In this embodiment, a device for detecting the moisture content at the gas-water separator outlet, such as a moisture analyzer or humidity sensor, can also be provided. This device detects the moisture content at the gas-water separator outlet and sends the detected moisture content data to the processor. The processor can then determine whether the moisture content at the gas-water separator outlet has stabilized, i.e., whether it is within a preset threshold range, based on the obtained moisture content. When the moisture content stabilizes, the processor controls the regeneration heater to stop operating. It is understood that the gas produced after electrolysis will contain liquid; therefore, it needs to be purified by an electrolysis gas purification system to obtain a purer gas. The higher the purity of the gas, the less liquid it carries, i.e., the lower the moisture content. Therefore, in this embodiment, the purity of the regenerated gas can be determined by the water content at the outlet of the gas-water separator. When the water content at the outlet of the gas-water separator drops to a preset threshold range that indicates the completion of purification of the regenerated gas, the gas regeneration and desorption process can be considered to be completed. Then, the regeneration heater can be controlled to stop working. The water content can be used to accurately determine the time point when the high-temperature regeneration ends, thus avoiding insufficient or excessive desorption of the regenerated gas.

[0052] In this invention, during the regeneration heating and desorption of the regenerated gas, the regeneration heater is controlled to heat the regenerated gas entering the regeneration heater at a preset power to perform regeneration heating and desorption. Based on the obtained water content at the gas-liquid separator outlet, when the water content at the gas-liquid separator outlet is within a preset threshold range, that is, when the water content at the gas-liquid separator outlet reaches a stable level, the gas regeneration and desorption process is considered complete, and at this point, the regeneration heater is controlled to stop working. This invention replaces the regeneration tower outlet temperature as the criterion for determining the completion of regeneration and desorption with the water content at the gas-liquid separator outlet. By accurately determining the time point at which high-temperature regeneration ends, it avoids insufficient or excessive desorption of the regenerated gas, which could affect the regeneration effect, the lifespan of the molecular sieve, and even increase regeneration energy consumption. This saves regeneration energy in the electrolytic gas purification system, protects the molecular sieve, and further improves regeneration efficiency.

[0053] Furthermore, during the electrolysis gas production process in the electrolyzer, there is a variable power condition, meaning that the electrolysis power of the electrolyzer will change. However, currently, during gas purification, regardless of whether the electrolysis power of the electrolyzer changes, the regeneration heater in the purification system heats at full power and does not adjust with the change in the electrolyzer power, thus leading to increased energy consumption in the regeneration process.

[0054] Reference Figure 2 In one embodiment, the method further includes the following steps before step S100:

[0055] Step S110: Obtain the electrolysis power of the electrolytic cell;

[0056] Step S120: Obtain the preset regeneration heating time, and determine the preset power of the regeneration heater based on the preset electrolysis power of the electrolytic cell and the preset regeneration heating time.

[0057] In this embodiment, the operating power of the regeneration heater can be adjusted according to the electrolysis power of the electrolytic cell and the preset regeneration heating time. It can be understood that the higher the electrolysis power of the electrolytic cell, the more gas is produced during electrolysis, and the more regeneration gas enters the regeneration heater. Therefore, the corresponding operating power of the regeneration heater should also be higher to ensure sufficient regeneration heating and desorption of the regeneration gas entering the regeneration heater. In other words, the electrolysis power of the electrolytic cell is directly proportional to the preset power of the regeneration heater; the higher the electrolysis power of the electrolytic cell, the higher the preset power of the regeneration heater, and vice versa. This setting allows the operating power of the regeneration heater to be adjusted according to changes in the power of the electrolytic cell, matching the operating power of the regeneration heater with the power of the electrolytic cell. It eliminates the need for constant power regeneration heating, thus enabling sufficient regeneration heating and desorption of the regeneration gas with minimal energy consumption, saving regeneration energy in the electrolytic gas purification system.

[0058] The regeneration heating time refers to the desired duration of the regeneration heating and desorption process. Therefore, when the electrolytic cell's power is constant, a longer heating time (i.e., a longer heating time for the regeneration heater) allows sufficient time to heat the regeneration gas, thus enabling a lower operating power setting for the regeneration heater. Conversely, a shorter heating time requires a higher operating power setting to adequately heat the regeneration gas. In other words, the regeneration heating time is inversely proportional to the regeneration heater's preset power; a longer heating time necessitates a lower preset power, and a shorter heating time requires a higher preset power.

[0059] In the technical solution of this invention, the preset power of the regeneration heater can be determined according to the electrolysis power of the electrolytic cell and the preset regeneration heating time, thereby controlling the regeneration heater to heat the incoming regeneration gas at the preset power. The variable power control of the regeneration heater is realized according to the electrolysis power of the electrolytic cell and the preset regeneration heating time, so as to fully regenerate, heat and desorb the molecular sieve of the regeneration tower with the most energy-saving method, saving the regeneration energy consumption of the electrolytic gas purification system, protecting the molecular sieve, and improving the regeneration efficiency.

[0060] Reference Figure 3In one embodiment, the method for controlling regeneration heating in the gas purification process further includes:

[0061] Step S130: Obtain the preset regenerated gas flow rate value and the real-time regenerated gas flow rate value, and adjust the opening of the regenerated gas flow control valve according to the preset regenerated gas flow rate value so that the real-time regenerated gas flow rate is within the preset regenerated gas flow rate range.

[0062] In this embodiment, the opening of the regeneration gas flow control valve can be adjusted according to the preset regeneration gas flow value, thereby controlling the real-time regeneration gas flow within the preset regeneration gas flow range. The preset regeneration gas flow range can be 0.9 times to 1.1 times the preset regeneration gas flow value, which means that the real-time regeneration gas flow value is close to the preset regeneration gas flow value, thereby maintaining the stability of the regeneration gas flow and avoiding insufficient or excessive desorption caused by flow fluctuations, or even equipment damage.

[0063] The step of obtaining the preset regeneration gas flow rate value specifically includes:

[0064] Obtain the electrolysis power of the electrolyzer and determine the preset regeneration gas flow rate value based on the electrolysis power of the electrolyzer.

[0065] In this embodiment, the preset regeneration gas flow rate is set based on the electrolysis power of the electrolytic cell. It can be understood that the higher the electrolysis power, the more gas is produced, and the more water is adsorbed by the adsorption tower. Correspondingly, the regeneration gas flow rate should be set higher to ensure desorption. Conversely, the lower the electrolysis power, the less gas is produced, and the regeneration gas flow rate should be set lower. Therefore, by obtaining the electrolysis power of the electrolytic cell, a preset regeneration gas flow rate can be set accordingly, and the preset power of the regeneration heater can be determined based on the regeneration gas flow rate and the regeneration heating time. This setting allows the operating power of the regeneration heater to be adjusted according to changes in the electrolytic cell power, matching the regeneration heater's operating power with the electrolytic cell power. This eliminates the need for constant power regeneration heating, enabling efficient regeneration heating and desorption of the regeneration gas with minimal energy consumption, thus saving energy in the electrolytic gas purification system.

[0066] In the technical solution of this invention, a preset regeneration gas flow rate value can be set according to the electrolysis power of the electrolytic cell. By controlling the opening of the regeneration gas flow control valve, the regeneration gas flow rate value can be controlled to the preset regeneration gas flow rate value in real time. The working power of the regeneration heater can be adjusted according to the regeneration gas flow rate value, so that the working power of the regeneration heater can be adjusted with the change of the electrolytic cell power. This makes the working power of the regeneration heater match the power of the electrolytic cell, eliminating the need for regeneration heating at a constant power. This allows the regeneration heater to fully regenerate, heat, and desorb the molecular sieve in the regeneration tower with the most energy-efficient method, saving regeneration energy consumption of the electrolytic gas purification system, protecting the molecular sieve, and improving regeneration efficiency.

[0067] The present invention also proposes an electrolytic gas purification system, the electrolytic gas purification system comprising:

[0068] Output module;

[0069] A drying unit is connected to the output module via a first pipe, and the drying unit is used to dry the gas;

[0070] A regeneration heater and a gas-liquid separator are respectively connected to the drying unit;

[0071] A regenerated gas flow control valve is installed on the first pipeline;

[0072] A moisture analyzer is installed between the gas-liquid separator and the drying unit;

[0073] The controller is connected to the regeneration heater, the regeneration gas flow control valve and the moisture analyzer respectively. The controller stores a regeneration heating control program. When the controller executes the regeneration heating control program, it implements the regeneration heating control method in the gas purification process described above.

[0074] In this embodiment, the electrolytic gas purification system includes a production module, a drying unit, a regeneration heater, a gas-water separator, a regeneration gas flow control valve, and a moisture analyzer. The production module may consist of a filter, a gas collection device, etc., used to filter the regeneration gas after drying and desorption, and collect the finally purified gas. The drying unit may consist of a drying and regeneration tower, used to dry and regenerate the gas to obtain purified gas. The moisture analyzer is used to detect the moisture content at the outlet of the gas-water separator and send the detected data to the controller so that the controller can implement the regeneration heating control method in the gas purification process described above.

[0075] Optionally, the controller is specifically used to obtain the moisture content at the outlet of the gas-water separator through the moisture analyzer, control the regeneration heater to regenerate and heat the gas entering the regeneration heater at a preset power, and adjust the opening of the regeneration gas flow control valve.

[0076] The controller can be implemented by a processor, such as an MCU, DSP (Digital Signal Processor), or FPGA (Field Programmable Gate Array). The controller can obtain the moisture content at the outlet of the gas-water separator through a moisture analyzer, and can control the real-time regeneration gas flow rate by adjusting the opening of the regeneration gas flow control valve. Furthermore, the controller can determine the preset power of the regeneration heater based on the obtained preset regeneration heating time and preset regeneration gas flow rate, thereby controlling the regeneration heater to regenerate and heat the gas entering the regeneration heater at the preset power. This ensures sufficient regeneration heating and desorption of the molecular sieve in the regeneration tower, saving regeneration energy consumption in the electrolytic gas purification system, protecting the molecular sieve, and improving regeneration efficiency.

[0077] In one embodiment, the drying unit is connected to the regeneration heater via a second pipe and a third pipe, and the drying unit is connected to the gas-liquid separator via a fourth pipe and a fifth pipe;

[0078] The electrolytic gas purification system also includes a gas-liquid separation unit, which is connected to the electrolytic cell and is connected to the drying unit through a sixth pipe. The gas-liquid separation unit is used to separate the gas-liquid mixture generated in the electrolytic cell and then output it to the drying unit.

[0079] Optionally, there may be multiple drying units, which may be connected in parallel.

[0080] The electrolytic gas purification system also includes:

[0081] The regeneration gas flow meter is connected to the drying module and the first pipeline, and is also connected to the controller. The regeneration gas flow meter is used to detect the regeneration gas flow and output it to the controller.

[0082] The electrolytic gas purification system also includes:

[0083] A heat exchanger is provided between the drying unit and the gas-liquid separator. The heat exchanger is used to treat the regeneration gas output from the drying unit by exchanging heat before sending it to the gas-liquid separator; or...

[0084] The regenerated gas output from the gas-water separator is heat-exchanged and then sent to the drying unit.

[0085] In one embodiment, reference is made to Figure 4 , Figure 4 This is a schematic diagram of a specific structure of an embodiment of an electrolytic gas purification system. There are three drying units, which are arranged in parallel. In this way, each drying unit can be used as an adsorption tower, a regeneration tower, or a secondary adsorption tower. The specific function of the drying unit is not fixed, and the gas flow direction in the regeneration process can be flexibly controlled. The following explanation uses drying unit 3 as an adsorption tower, drying unit 4 as a regeneration tower, and drying unit 5 as a secondary adsorption tower as an example. After the gas-liquid separation unit separates the gas-liquid mixture generated by the electrolytic cell, valves 10 and 20 are opened, and the gas enters drying unit 3 for adsorption. Then, valve 28 is opened, and part of the adsorbed regenerated gas enters filter 9 as product gas, while the other part enters regeneration heater 6 for regeneration heating. Regeneration heater 6 is controlled to perform regeneration heating, and valve 24 is opened. At this time, the heated gas enters regeneration tower 4 for regeneration heating of the molecular sieve. Then, valve 15 is opened, and the high-temperature gas from the regeneration tower enters heat exchanger 7 and gas-liquid separator 8. After cooling and gas-liquid separation, valves 17 and 25 are opened, and the gas enters secondary adsorption tower 5. After adsorption, it finally enters filter 9 to obtain purified regenerated gas. It can be understood that drying unit 3 can also be a regeneration tower or a secondary adsorption tower. The order in which the regenerated gas passes through drying units 3, 4, and 5 can be set according to actual usage, and the specific implementation is not unique.

[0086] In this embodiment, the control of the regeneration heater 6 is as follows: the regeneration gas flow rate is controlled by the regeneration gas flow control valve 28. For example, when the preset regeneration gas flow rate is greater than the actual regeneration gas flow rate, the small flow control valve 28 is opened; when the preset regeneration gas flow rate is less than the actual regeneration gas flow rate, the large flow control valve 28 is opened. Then, a preset power is determined based on the preset regeneration gas flow rate and the preset heating time and sent to the regeneration heater 6, thereby controlling the regeneration heater 6 to perform regeneration heating according to this preset power. In addition, during the heating process of the regeneration heater 6, the solenoid valve 30 is opened to monitor the water content at the outlet of the gas-water separator 8 in real time. When the water content at the outlet reaches a stable level, that is, when it drops to the preset water content range, the regeneration heater is controlled to stop heating. In the technical solution of this invention, the regeneration heater is independently set outside the drying unit, which simplifies the overall processing flow of the electrolytic gas purification system, reduces the overall cost of the electrolytic gas purification system, and improves the regeneration efficiency of the electrolytic gas purification system.

[0087] In another embodiment, the regeneration heater is disposed within the drying unit, and the drying unit is connected to the gas-liquid separator via a second pipe;

[0088] The electrolytic gas purification system further includes a gas-liquid separation unit, which is connected to the electrolytic cell and is connected to the gas-water separator via a third pipeline. The gas-liquid separation unit is used to separate the gas-liquid mixture generated in the electrolytic cell and then output it to the gas-water separator.

[0089] Optionally, the drying unit and the gas-liquid separator are connected in series to form a drying module, and there are multiple drying modules connected in parallel.

[0090] In another embodiment, reference Figure 5 , Figure 5 This is a schematic diagram of a specific structure of an embodiment of an electrolytic gas purification system. The regeneration heater is integrated inside a drying unit. There are three drying units, as well as three heat exchangers and gas-liquid separators. Each drying unit, along with the heat exchanger and gas-liquid separator, forms a drying module, and the three drying modules are connected in parallel. Thus, each drying unit can be used as an adsorption tower, a regeneration tower, or a secondary adsorption tower; the specific function of the drying unit is not fixed, and the gas flow direction during the regeneration process can be flexibly controlled. The following explanation uses drying unit 3 as an adsorption tower, drying unit 4 as a regeneration tower, and drying unit 5 as a secondary adsorption tower as an example. After the gas-liquid separation unit separates the gas-liquid mixture generated by the electrolytic cell, valve 22 is opened, and the gas enters the gas-liquid separator 7 and heat exchanger 6, and then enters the drying unit 3 for adsorption. Valve 15 is opened, and part of the adsorbed gas enters the filter 12 as product gas. At the same time, valve 17 is opened, allowing another part of the gas from the drying unit 3 to enter the regeneration tower 4. At this time, the heater in the regeneration tower 4 is turned on to heat the incoming gas and regenerate the molecular sieve. Valves 23 and 25 are opened, and the high-temperature gas from the regeneration tower enters the heat exchanger 8 and gas-liquid separator 9, as well as the gas-liquid separator 11 and heat exchanger 10. After cooling and separation, the gas enters the secondary adsorption tower 5 for further adsorption. Valve 20 is then opened, and the gas after passing through the secondary adsorption tower 5 enters the filter 12 to obtain the purified product gas. Furthermore, during the heating process of the regeneration heater 6, valve 28 and solenoid valve 30 are opened to monitor the moisture content at the outlet of the gas-water separator 9 in real time. When the moisture content at the outlet reaches a stable level, i.e., drops to a preset water content range, the regeneration heater is controlled to stop heating. It is understood that the drying unit 3 can also be a regeneration tower or a secondary adsorption tower. The order in which the regenerated gas passes through drying units 3, 4, and 5 can be set according to actual usage conditions, and the specific implementation is not unique.

[0091] In this embodiment, the control of the regeneration heater in the regeneration tower 4 is as follows: the regeneration gas flow rate is controlled by the regeneration gas flow control valve 14. For example, when the preset regeneration gas flow rate is greater than the actual regeneration gas flow rate, the small flow control valve 14 is opened; when the preset regeneration gas flow rate is less than the actual regeneration gas flow rate, the large flow control valve 14 is opened. Then, a preset power is determined based on the preset regeneration gas flow rate and the preset heating time and sent to the regeneration heater, thereby controlling the regeneration heater to perform regeneration heating according to this preset power. In addition, during the heating process of the regeneration heater, the solenoid valve 30 and the gas sampling valve of the gas-water separator at the outlet of the regeneration tower are opened, and the water content at the outlet of the gas-water separator at the outlet of the regeneration tower is monitored in real time. When the water content at the outlet reaches a stable level, that is, when it drops to the preset water content range, the regeneration heater is controlled to stop heating. In the technical solution of this invention, the regeneration heater is integrated inside the drying unit, which makes the regeneration heating process of the regeneration gas in the electrolytic gas purification system more complete, while also reducing the number of external pipelines, reducing the pipeline complexity of the electrolytic gas purification system, and improving the regeneration efficiency of the electrolytic gas purification system.

[0092] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for controlling regeneration heating in a gas purification process, applied to an electrolytic gas purification system, wherein the electrolytic gas purification system includes a regeneration heater, a drying unit, a gas-liquid separator, a heat exchanger, and a moisture analyzer, wherein the regeneration heater and the gas-liquid separator are respectively connected to the drying unit, characterized in that... The heat exchanger is disposed between the drying unit and the gas-liquid separator. The heat exchanger is used to treat the regeneration gas output from the drying unit before sending it to the gas-liquid separator; or, it is used to treat the regeneration gas output from the gas-liquid separator before sending it to the drying unit. There are three drying units, and each drying unit can be dynamically switched to be used as an adsorption tower, a regeneration tower, or a secondary adsorption tower. At the same time, the three drying units are used as an adsorption tower, a regeneration tower, and a secondary adsorption tower, respectively. The moisture analyzer is disposed between each gas-liquid separator and the corresponding drying unit to detect the moisture content at the outlet of each gas-liquid separator. The method for controlling regeneration heating in the gas purification process includes: Obtain the electrolysis power of the electrolytic cell; Obtain the preset regeneration heating time, and determine the preset power of the regeneration heater based on the electrolysis power of the electrolytic cell and the preset regeneration heating time; wherein, the electrolysis power of the electrolytic cell is directly proportional to the preset power of the regeneration heater, and the regeneration heating time is inversely proportional to the preset power of the regeneration heater; The preset regeneration gas flow rate is determined based on the electrolysis power of the electrolyzer; Control the regeneration heater to regenerate and heat the gas entering the regeneration heater at a preset power; The opening of the regeneration gas flow control valve is adjusted according to the preset regeneration gas flow value so that the real-time regeneration gas flow is within the preset regeneration gas flow range, and the real-time regeneration gas flow value is controlled to the preset regeneration gas flow value. The working power of the regeneration heater is also adjusted according to the regeneration gas flow value so that the working power of the regeneration heater matches the power of the electrolytic cell. The preset regeneration gas flow range is 0.9 times to 1.1 times the preset regeneration gas flow value. The moisture content at the outlet of the gas-water separator is obtained. When the obtained moisture content at the outlet of the gas-water separator is within a preset threshold range that indicates that the regeneration gas has been purified, the gas regeneration and desorption process is determined to be complete, and the regeneration heater is controlled to stop working.

2. An electrolytic gas purification system, characterized in that, The electrolytic gas purification system includes: Output module; A drying unit is connected to the output module via a first pipe, and the drying unit is used to dry the gas; A regeneration heater and a gas-liquid separator are respectively connected to the drying unit; A regenerated gas flow control valve is installed on the first pipeline; A moisture analyzer is installed between the gas-liquid separator and the drying unit; The controller is connected to the regeneration heater, the regeneration gas flow control valve and the moisture analyzer respectively. The controller stores a regeneration heating control program. When the controller executes the regeneration heating control program, it implements the regeneration heating control method in the gas purification process as described in claim 1.

3. The electrolytic gas purification system as described in claim 2, characterized in that, The controller is specifically used to obtain the moisture content at the outlet of the gas-water separator through the moisture analyzer, control the regeneration heater to regenerate and heat the gas entering the regeneration heater at a preset power, and adjust the opening of the regeneration gas flow control valve.

4. The electrolytic gas purification system as described in claim 2, characterized in that, The drying unit is connected to the regeneration heater via a second pipe and a third pipe, and the drying unit is connected to the gas-water separator via a fourth pipe and a fifth pipe; The electrolytic gas purification system also includes a gas-liquid separation unit, which is connected to the electrolytic cell and is connected to the drying unit through a sixth pipe. The gas-liquid separation unit is used to separate the gas-liquid mixture generated in the electrolytic cell and then output it to the drying unit.

5. The electrolytic gas purification system as described in claim 2, characterized in that, The regeneration heater is located inside the drying unit, and the drying unit is connected to the gas-liquid separator via a seventh pipe. The electrolytic gas purification system further includes a gas-liquid separation unit, which is connected to the electrolytic cell and is connected to the gas-water separator via an eighth pipe. The gas-liquid separation unit is used to separate the gas-liquid mixture generated in the electrolytic cell and then output it to the gas-water separator.

6. The electrolytic gas purification system as described in claim 5, characterized in that, The drying unit and the gas-liquid separator are connected in series to form a drying module. There are multiple drying modules, and the multiple drying modules are connected in parallel.

7. The electrolytic gas purification system as described in claim 6, characterized in that, The electrolytic gas purification system also includes: The regeneration gas flow meter is connected to the drying module and the first pipeline, and is also connected to the controller. The regeneration gas flow meter is used to detect the regeneration gas flow and output it to the controller.

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