Gas production system and control method thereof

Abstract

The invention provides a gas making system and a control method thereof. If the temperature of the upper tower of the drying tower in the regeneration stage in the closed renewable dryer does not rise abnormally, the temperature of the upper tower is smaller than or equal to the temperature of the lower tower, so that if the temperature of the upper tower is greater than the temperature of the lower tower, the temperature of the upper tower of the drying tower in the regeneration stage may rise abnormally. Besides, if the gas production system stops, the temperature of the upper tower of the drying tower which is originally in the regeneration stage is gradually reduced, so that the temperature of the upper tower of the drying tower which is originally in the regeneration stage can be gradually reduced by controlling the gas production system to stop. In conclusion, the possibility that the temperature of the upper tower of the drying tower which is originally in a regeneration stage is abnormally increased is reduced, so that the possibility of the problems of deformation and sealing failure of related valves and pipeline joints due to high temperature is reduced; therefore, the possibility of leakage of the combustible gas in the manufacturing process is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of gas production, and in particular to a gas production system and a control method thereof. Background Art

[0002] At present, for combustible gases such as hydrogen, closed regenerative dryers are usually used to dry the combustible gases. Since closed regenerative dryers can regenerate the desiccant in themselves, they can ensure that the combustible gases are always effectively dried.

[0003] However, in the manufacturing process of combustible gas, gas leakage problems often occur. Since the explosion limit of combustible gas is relatively wide, that is, it is flammable and explosive, once the combustible gas leaks, it may cause serious consequences.

[0004] Therefore, how to reduce the possibility of leakage of combustible gas during its manufacturing process is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, the present invention provides a gas production system and a control method thereof to reduce the possibility of leakage of combustible gas during its production process.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] On one hand, the present application provides a control method for a gas production system, wherein the gas production system is used to produce combustible gas, and a dryer in the gas production system is a closed regenerative dryer; the control method for the gas production system comprises:

[0008] Determining whether the upper tower temperature of the drying tower in the regeneration stage of the closed regenerable dryer is greater than the lower tower temperature;

[0009] If the upper tower temperature of the drying tower in the regeneration stage in the closed regenerable dryer is greater than the lower tower temperature, the gas production system is controlled to shut down.

[0010] Optionally, before executing the step of controlling the gas production system to shut down, the method further includes:

[0011] Determine whether the absolute value of the difference between the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage of the closed regenerable dryer is greater than a preset value;

[0012] If the absolute value of the difference between the upper tower temperature and the lower tower temperature of the drying tower in the closed regenerable dryer in the regeneration stage is greater than the preset value, the step of controlling the gas production system to shut down is performed.

[0013] Optionally, if the absolute value of the difference between the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer is less than or equal to the preset value, the step of determining whether the upper tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer is greater than the lower tower temperature is returned.

[0014] Optionally, if the upper tower temperature of the drying tower in the closed regenerative dryer in the regeneration stage is less than or equal to the lower tower temperature, return to the step of determining whether the upper tower temperature of the drying tower in the closed regenerative dryer in the regeneration stage is greater than the lower tower temperature.

[0015] On the other hand, the present application provides a gas production system, including: a gas production device, a dryer and a controller; wherein:

[0016] The outlet of the gas making device is connected to the inlet of the dryer, and the gas making device is used to produce combustible gas;

[0017] The outlet of the dryer serves as the outlet of the gas production system, and the dryer is used to dry the gas produced by the gas production device;

[0018] The start and stop of the gas production device is controlled by the controller, and the switching of the drying tower in the regeneration stage in the dryer is controlled by the controller. The controller is used to detect the upper tower temperature and the lower tower temperature of each of the drying towers. The controller is also used to execute the control method of the gas production system as described in any one of the above aspects of the present application.

[0019] Optionally, the dryer comprises: three drying towers; wherein:

[0020] The inlet of the first drying tower serves as the inlet of the dryer, the outlet of the first drying tower is connected to the inlet of the second drying tower, the outlet of the second drying tower is connected to the inlet of the third drying tower, and the outlet of the third drying tower serves as the outlet of the dryer;

[0021] The first drying tower, the second drying tower and the third drying tower all have a heating function, and the start and stop of the heating function of the first drying tower, the start and stop of the heating function of the second drying tower and the start and stop of the heating function of the third drying tower are all controlled by the controller.

[0022] Optionally, the dryer further comprises: three coolers; wherein:

[0023] The outlet of the first cooler is connected to the inlet of the first drying tower, and the inlet of the first cooler serves as the inlet of the dryer;

[0024] The inlet of the second cooler is connected to the outlet of the second drying tower, and the outlet of the second cooler is connected to the inlet of the third cooler;

[0025] The outlet of the third cooler is connected to the inlet of the third drying tower.

[0026] Optionally, the dryer comprises: two drying towers; wherein:

[0027] The inlet of the fourth drying tower serves as the inlet of the dryer, the outlet of the fourth drying tower is connected to the inlet of the fifth cooler, and the outlet of the fifth drying tower serves as the outlet of the dryer;

[0028] The fourth drying tower and the fifth drying tower both have a heating function, and the start and stop of the heating function of the fourth drying tower and the start and stop of the heating function of the fifth drying tower are both controlled by the controller.

[0029] Optionally, the dryer further comprises: two coolers; wherein:

[0030] The inlet of the fourth cooler is connected to the outlet of the fourth drying tower, the outlet of the fourth cooler is connected to the inlet of the fifth cooler, and the outlet of the fifth cooler is connected to the inlet of the fifth drying tower.

[0031] Optionally, the gas produced by the gas production device includes: hydrogen.

[0032] It can be seen from the above technical solution that the present invention provides a control method for a gas production system. Normally, if the upper tower temperature of the drying tower in the regeneration stage in the closed regenerative dryer does not rise abnormally, the upper tower temperature of the drying tower in the regeneration stage is less than or equal to the lower tower temperature. Therefore, if the upper tower temperature of the drying tower in the regeneration stage is greater than the lower tower temperature, it indicates that the upper tower temperature of the drying tower in the regeneration stage may rise abnormally. In addition, normally, if the gas production system is shut down, the closed regenerative dryer also stops running, that is, the upper tower temperature of the drying tower originally in the regeneration stage gradually decreases. Therefore, controlling the gas production system to shut down can gradually reduce the upper tower temperature of the drying tower originally in the regeneration stage. In summary, the control method gradually reduces the upper tower temperature of the drying tower in the regeneration stage when the upper tower temperature of the drying tower in the regeneration stage may rise abnormally, thereby reducing the possibility of abnormal increase in the upper tower temperature of the drying tower in the regeneration stage, thereby reducing the possibility of deformation and sealing failure of related valves and pipeline joints due to high temperature, thereby reducing the possibility of gas leakage in the gas production system. Since the gas production system is used to manufacture combustible gas, the control method reduces the possibility of leakage of combustible gas during its manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1 A flow chart of a specific implementation of a method for controlling a gas production system provided in an embodiment of the present application;

[0035] Figure 2a is a side view of a drying tower;

[0036] Figure 2b It is a top view of the drying tower;

[0037] Figure 3 is a schematic diagram of the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage when the gas production system does not implement the above control method;

[0038] Figure 4 Schematic diagram of the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage when the gas production system executes the above control method;

[0039] Figure 5 A flow chart of another specific implementation of the control method of the gas production system provided in an embodiment of the present application;

[0040] Figure 6 A schematic structural diagram of a specific implementation of a gas production system provided in an embodiment of the present application;

[0041] Figure 7 A structural schematic diagram of another specific implementation of the gas production system provided in an embodiment of the present application;

[0042] Figure 8 A structural schematic diagram of another specific implementation of the gas production system provided in the embodiment of the present application;

[0043] Fig. 9 A schematic structural diagram of another specific implementation manner of the gas production system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] In this application, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0046] In order to reduce the possibility of leakage of combustible gas during its production process, an embodiment of the present application provides a control method for a gas production system. The gas production system is used to produce combustible gas, and the dryer in the gas production system is a closed regenerative dryer, that is, the desiccant in the dryer can be automatically regenerated.

[0047] The specific process of the control method of the above gas production system is as follows: Figure 1 As shown, the specific steps include:

[0048] S110, determining whether the upper tower temperature of the drying tower in the closed regenerable dryer in the regeneration stage is greater than the lower tower temperature.

[0049] If the upper tower temperature of the drying tower in the closed regenerative dryer in the regeneration stage is greater than the lower tower temperature, execute step S120; if the upper tower temperature of the drying tower in the closed regenerative dryer in the regeneration stage is less than or equal to the lower tower temperature, return to execute step S110.

[0050] Generally, each drying tower in a closed regenerative dryer has a heating function, so the drying tower in the regeneration stage refers to the drying tower with the heating function activated. How the drying tower in the regeneration stage operates will be described in detail below and will not be repeated here.

[0051] In addition, the specific structure of the drying tower is as follows Figure 2a and Figure 2b As shown, the drying tower includes an outer cylinder 100, an inner cylinder 200, an upper tower temperature probe 300 and a lower tower temperature probe 400. The upper tower temperature of the drying tower refers to the temperature of the upper part of the space between the inner cylinder 200 and the outer cylinder 100 of the drying tower. For details, see Figure 2a and Figure 2b The position of the upper tower temperature probe 300. The lower tower temperature of the drying tower refers to the temperature at the lower end of the inner cylinder 200. For details, please refer to Figure 2a and Figure 2b The location of the temperature probe 400 in the middle and lower tower.

[0052] It should be noted that how the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer are obtained will be described in detail below and will not be repeated here.

[0053] Normally, if the upper tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer does not rise abnormally, Figure 3 As shown, the upper tower temperature of the drying tower in the regeneration stage is less than or equal to the lower tower temperature. Therefore, if the upper tower temperature of the drying tower in the regeneration stage is greater than the lower tower temperature, it indicates that the upper tower temperature of the drying tower in the regeneration stage may increase abnormally.

[0054] In addition, if the upper tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer does not rise abnormally, it indicates that the closed regenerative dryer is operating normally. If the upper tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer rises abnormally, it indicates that there is an abnormality in the operation of the closed regenerative dryer.

[0055] S120, controlling the gas production system to shut down.

[0056] It should be noted that the shutdown of the gas production system is controlled by triggering the shutdown procedure of the gas production system. The shutdown procedure of the gas production system is already very mature in the prior art and will not be described in detail here.

[0057] Normally, if the gas production system is shut down, the closed regenerative dryer stops operating, that is, the upper tower temperature of the drying tower that was originally in the regeneration stage gradually decreases. Therefore, controlling the gas production system to shut down can make the upper tower temperature of the drying tower that was originally in the regeneration stage gradually decrease.

[0058] It should be noted that, under normal circumstances, if the closed regenerative dryer stops operating, the heating function of the drying tower originally in the regeneration stage is disabled, that is, the drying tower originally in the regeneration stage loses its heat source, so the upper tower temperature of the drying tower originally in the regeneration stage gradually decreases. As for how the drying tower in the regeneration stage operates, it will be explained in detail below and will not be repeated here.

[0059] In summary, the control method gradually reduces the upper tower temperature of the drying tower in the regeneration stage when the upper tower temperature of the drying tower in the regeneration stage may rise abnormally, thereby reducing the possibility of abnormal increase in the upper tower temperature of the drying tower in the regeneration stage, thereby reducing the possibility of deformation and sealing failure of related valves and pipeline joints due to high temperature, thereby reducing the possibility of gas leakage in the gas production system. Since the gas production system is used to manufacture combustible gas, the control method reduces the possibility of leakage of combustible gas during its manufacturing process.

[0060] In the case where the gas production system does not implement the above control method, Figure 3 As shown, 01 is the upper tower temperature of the drying tower in the regeneration stage, 02 is the lower tower temperature of the drying tower in the regeneration stage, between t0 and t2, the upper tower temperature of the drying tower in the regeneration stage is greater than the lower tower temperature of the drying tower in the regeneration stage, and at time t1, a combustible gas leak is detected. In the case where the gas production system executes the above control method, as Figure 4 As shown, 01 is the upper tower temperature of the drying tower in the regeneration stage, 02 is the lower tower temperature of the drying tower in the regeneration stage, at time t3, the above-mentioned gas production system is shut down, and at time t1, it is detected that no leakage of combustible gas occurs. From the above comparison, it can be seen that when the upper tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer is greater than the lower tower temperature, the gas production system is controlled to shut down, which can indeed reduce the possibility of leakage of combustible gas in its manufacturing process.

[0061] Another embodiment of the present application provides another implementation method of a control method for a gas production system, and the specific process is as follows: Figure 5 As shown, this embodiment further includes the following steps before step S120 in the above embodiment:

[0062] S210: Determine whether the absolute value of the difference between the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage in the closed regenerative dryer is greater than a preset value.

[0063] If the absolute value of the difference between the upper tower temperature and the lower tower temperature of the drying tower in the closed regenerative dryer in the regeneration stage is greater than the preset value, execute step S120; if the absolute value of the difference between the upper tower temperature and the lower tower temperature of the drying tower in the closed regenerative dryer in the regeneration stage is less than or equal to the preset value, return to execute step S110.

[0064] The absolute value of the difference between the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer is greater than the preset value, indicating that the absolute value of the difference between the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer is large. In other words, the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer are very different. On the contrary, the absolute value of the difference between the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer is less than or equal to the preset value, indicating that the absolute value of the difference between the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer is not very large. In other words, the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer are not very different. In practical applications, the preset value is set according to actual conditions and is not specifically limited here. Usually, the preset value can be set to 20°C.

[0065] In this embodiment, since step S210 is added before executing step S120, the control method increases the margin of triggering step S120, thereby preventing step S120 from being triggered by mistake, thereby improving the reliability of the control method. In addition, the control method can also prevent step S120 from being triggered frequently by increasing the margin of triggering step S120, thereby improving the user experience of the control method in special circumstances.

[0066] The present application provides a gas production system, the specific structure of which is as follows Figure 6 As shown, it specifically includes: a gas making device 10, a dryer 20 and a controller 30.

[0067] The outlet of the gas making device 10 is connected to the inlet of the dryer 20, and the gas making device 10 is used to produce combustible gas.

[0068] The outlet of the dryer 20 serves as the outlet of the gas production system, and the dryer 20 is used to dry the gas produced by the gas production device 10 .

[0069] The start and stop of the gas making device 10 is controlled by the controller 30. As for when the controller 30 controls the gas making device 10 to start and when it controls the gas making device 10 to stop, it is already very mature in the prior art and will not be described in detail here.

[0070] The switching of the drying tower in the regeneration stage in the dryer 20 is controlled by the controller 30. How the controller 30 implements the switching of the drying tower in the regeneration stage will be described in detail below and will not be repeated here.

[0071] The controller 30 is used to detect the upper tower temperature and the lower tower temperature of each drying tower. Generally, the controller 30 detects the upper tower temperature of each drying tower through a temperature measuring device arranged at the upper half of each drying tower, and detects the lower tower temperature of each drying tower through a temperature measuring device arranged at the lower half of each drying tower.

[0072] The controller 30 is also used to execute the control method of the gas production system provided in the above embodiment.

[0073] In a specific example, the gas produced by the gas production device 10 includes hydrogen.

[0074] The above example only shows a specific implementation of the gas produced by the gas production device 10. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to the specific situation, all of which are within the scope of protection of this application.

[0075] In this embodiment, since the controller 30 executes the control method of the gas production system provided in the above embodiment, the gas production system can reduce the possibility of leakage of combustible gas during its production process.

[0076] Another embodiment of the present application provides a specific implementation of the dryer 20, and its specific structure is as follows: Figure 6 As shown, it specifically includes: a first drying tower 21, a second drying tower 22 and a third drying tower 23. The connection relationship between the components is specifically described as follows:

[0077] The inlet of the first drying tower 21 serves as the inlet of the dryer 20 , the outlet of the first drying tower 21 is connected to the inlet of the second drying tower 22 , the outlet of the second drying tower 22 is connected to the inlet of the third drying tower 23 , and the outlet of the third drying tower 23 serves as the outlet of the dryer 20 .

[0078] The first drying tower 21, the second drying tower 22, and the third drying tower 23 all have a heating function, and the start and stop of the heating function of the first drying tower 21, the start and stop of the heating function of the second drying tower 22, and the start and stop of the heating function of the third drying tower 23 are all controlled by the controller 30. Specifically, the controller 30 only starts the heating function of one of the first drying tower 21, the second drying tower 22, and the third drying tower 23 at a time, and the controller 30 starts the heating function of the first drying tower 21, the second drying tower 22, and the third drying tower 23 in a certain order. It should be noted that if the heating function of a drying tower is started, it indicates that the drying tower is in the regeneration stage.

[0079] According to the wetness of the desiccant in the drying tower, the operation stages of the drying tower are divided into adsorption stage, drying stage, and regeneration stage. Among them, the wetness of the desiccant in the drying tower in the adsorption stage is the lowest, the wetness of the desiccant in the drying tower in the drying stage is in the middle, and the wetness of the desiccant in the drying tower in the adsorption stage is the highest.

[0080] When the dryer is in operation, each drying tower cycle is in the adsorption stage, the drying stage, and the regeneration stage, and the three drying towers are in three different stages in the same time period.

[0081] Assuming that the first drying tower is in the drying stage, the second drying tower is in the regeneration stage, and the third drying tower is in the adsorption stage, then:

[0082] The gas produced by the gas production device 10 first enters the first drying tower 21 for drying. After that, the gas produced by the gas production device 10 enters the second drying tower 22. Since the heating function of the second drying tower 22 is activated, the desiccant in the second drying tower 22 is heated, and the moisture inside it is converted into water vapor, and the water vapor is taken away by the adsorption and flow of the gas produced by the gas production device 10, thereby achieving the regeneration of the desiccant in the second drying tower 22. Finally, the gas produced by the gas production device 10 enters the third drying tower 23, and the desiccant in the third drying tower 23 adsorbs the moisture in the gas produced by the gas production device to achieve a drying effect.

[0083] After the above process is carried out for a period of time, the heating function of the second drying tower 22 is disabled and the heating function of the first drying tower 21 is enabled, then the first drying tower 21 is in the regeneration stage, the second drying tower 22 is in the adsorption stage, and the third drying tower 23 is in the drying stage.

[0084] After the above process is carried out for a period of time, the heating function of the first drying tower 21 is disabled and the heating function of the third drying tower 23 is enabled, then the first drying tower 21 is in the adsorption stage, the second drying tower 22 is in the drying stage, and the third drying tower 23 is in the regeneration stage.

[0085] After the above process is carried out for a period of time, the heating function of the third drying tower 23 is disabled and the heating function of the second drying tower 22 is enabled, then the first drying tower 21 is in the drying stage, the second drying tower 22 is in the regeneration stage, and the third drying tower 23 is in the adsorption stage.

[0086] This cycle is repeated, thus ensuring that the dryer can always dry the gas produced by the gas production device 10, thereby ensuring that the gas produced by the gas production device 10 can always be effectively dried. In addition, since the desiccant in the dryer 20 can be regenerated, there is no need to frequently replenish the desiccant in the dryer 20, so it is particularly suitable for combustible gases such as hydrogen.

[0087] Another embodiment of the present application provides another specific implementation of the dryer 20, and its specific structure is as follows: Figure 7 As shown, this embodiment, based on the previous embodiment, further includes: a first cooler 24, a second cooler 25 and a third cooler 26. The connection relationship between the components is specifically described as follows:

[0088] The outlet of the first cooler 24 is connected to the inlet of the first drying tower 21, and the inlet of the first cooler 24 serves as the inlet of the dryer 20. The inlet of the second cooler 25 is connected to the outlet of the second drying tower 22, and the outlet of the second cooler 26 is connected to the inlet of the third cooler 23. The outlet of the third cooler 23 is connected to the inlet of the third drying tower 23.

[0089] Since the gas produced by the gas production device 10 includes water vapor, after the gas produced by the gas production device 10 enters the first cooler 24, a part of the water vapor releases energy and turns into liquid water and precipitates, so that the moisture content of the gas produced by the gas production device 10 is further reduced after passing through the first cooler 24. The gas produced by the gas production device 10 passes through the second cooler 25 and the third cooler 26 in the same manner as the above process, which will not be repeated here.

[0090] It can be seen from the above that by adding a cooler, the moisture in the gas produced by the gas production device 10 is further reduced, thereby further optimizing the drying effect of the dryer 20, thereby improving the quality of the gas produced by the gas production system.

[0091] Another embodiment of the present application provides another specific implementation of the dryer 20, and its specific structure is as follows: Figure 8 As shown, it specifically includes: a fourth drying tower 31 and a fifth drying tower 32. The connection relationship between the various components is specifically described as follows:

[0092] The inlet of the fourth drying tower 31 serves as the inlet of the dryer 20, the outlet of the fourth drying tower 31 is connected to the inlet of the fifth drying tower 32, and the outlet of the fifth drying tower 32 serves as the outlet of the dryer 20. The fourth drying tower 31 and the fifth drying tower 32 both have a heating function, and the start and stop of the heating function of the fourth drying tower 31 and the start and stop of the heating function of the fifth drying tower 32 are both controlled by the controller 30.

[0093] According to the wetness of the desiccant in the drying tower, the operation stage of the drying tower is divided into the adsorption stage and the regeneration stage. Among them, the wetness of the desiccant in the drying tower in the adsorption stage is the lowest, and the wetness of the desiccant in the drying tower in the adsorption stage is the highest.

[0094] When the dryer 20 is in operation, each drying tower cycle is in an adsorption stage and a regeneration stage, and the two drying towers are in two different stages in the same time period.

[0095] Assuming that the fourth drying tower 31 is in the regeneration stage and the fifth drying tower 32 is in the adsorption stage, then:

[0096] The gas produced by the gas production device 10 first enters the fourth drying tower 31. Since the heating function of the fourth drying tower 31 is activated, the desiccant in the fourth drying tower 31 is heated, and the moisture inside it is converted into water vapor, and the water vapor is taken away by the adsorption and flow of the gas produced by the gas production device 10, thereby achieving the regeneration of the desiccant in the fourth drying tower 31. Afterwards, the gas produced by the gas production device 10 enters the fifth drying tower 32, and the desiccant in the fifth drying tower 32 adsorbs the moisture in the gas produced by the gas production device 10 to achieve a drying effect.

[0097] After the above process is carried out for a period of time, the heating function of the fourth drying tower 31 is disabled and the heating function of the fifth drying tower 32 is enabled, then the fifth drying tower 32 is in the regeneration stage and the fourth drying tower 31 is in the adsorption stage.

[0098] After the above process is carried out for a period of time, the heating function of the fifth drying tower 32 is disabled and the heating function of the fourth drying tower 31 is enabled, then the fourth drying tower 31 is in the regeneration stage and the fifth drying tower 32 is in the adsorption stage.

[0099] This cycle is repeated, thereby ensuring that the dryer 20 can always dry the gas produced by the gas production device 10, thereby ensuring that the gas produced by the gas production device 10 can always be effectively dried. In addition, since the desiccant in the dryer 20 can be regenerated, there is no need to frequently replenish the desiccant in the dryer 20, so it is particularly suitable for combustible gases such as hydrogen.

[0100] Another embodiment of the present application provides another specific implementation of the dryer 20, and its specific structure is as follows: Fig. 9 As shown, this embodiment, based on the previous embodiment, further includes: a fourth cooler 33 and a fifth cooler 34. The connection relationship between the components is specifically described as follows:

[0101] The inlet of the fourth cooler 33 is connected to the outlet of the fourth drying tower 31 , the outlet of the fourth cooler 33 is connected to the inlet of the fifth cooler 34 , and the outlet of the fifth cooler 34 is connected to the inlet of the fifth drying tower 32 .

[0102] Since the gas produced by the gas production device 10 includes water vapor, after the gas produced by the gas production device 10 enters the fourth cooler 33, a part of the water vapor releases energy and turns into liquid water and precipitates, so that the moisture content of the gas produced by the gas production device 10 is further reduced after passing through the fourth cooler 33. The process of the gas produced by the gas production device 10 passing through the fifth cooler 34 is the same as the above process, which will not be repeated here.

[0103] It can be seen from the above that by adding a cooler, the moisture in the gas produced by the gas production device 10 is further reduced, thereby further optimizing the drying effect of the dryer 20, thereby improving the quality of the gas produced by the gas production system.

[0104] For the above description of the disclosed embodiments, the features recorded in each embodiment in this specification can be replaced or combined with each other, so that professionals in the field can implement or use the present application. The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with a preferred embodiment, it is not used to limit the present invention. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A control method for a gas production system, characterized in that: The gas production system is used to produce combustible gas, and the dryer in the gas production system is a closed regenerative dryer; the control method of the gas production system includes: Determining whether the upper tower temperature of the drying tower in the regeneration stage of the closed regenerable dryer is greater than the lower tower temperature; If the upper tower temperature of the drying tower in the regeneration stage in the closed regenerable dryer is greater than the lower tower temperature, the gas production system is controlled to shut down.

2. The control method of the gas production system according to claim 1, characterized in that: Before executing the step of controlling the gas production system to shut down, the method further includes: Determine whether the absolute value of the difference between the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage of the closed regenerable dryer is greater than a preset value; If the absolute value of the difference between the upper tower temperature and the lower tower temperature of the drying tower in the closed regenerable dryer in the regeneration stage is greater than the preset value, the step of controlling the gas production system to shut down is performed.

3. The control method of the gas production system according to claim 2, characterized in that: If the absolute value of the difference between the upper tower temperature and the lower tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer is less than or equal to the preset value, return to the step of determining whether the upper tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer is greater than the lower tower temperature.

4. The control method of the gas production system according to any one of claims 1 to 3, characterized in that: If the upper tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer is less than or equal to the lower tower temperature, return to the step of determining whether the upper tower temperature of the drying tower in the regeneration stage of the closed regenerative dryer is greater than the lower tower temperature.

5. A gas production system, characterized in that: include: Gas making device, dryer and controller; wherein: The outlet of the gas making device is connected to the inlet of the dryer, and the gas making device is used to produce combustible gas; The outlet of the dryer serves as the outlet of the gas production system, and the dryer is used to dry the gas produced by the gas production device; The start and stop of the gas production device is controlled by the controller, and the switching of the drying tower in the regeneration stage in the dryer is controlled by the controller. The controller is used to detect the upper tower temperature and the lower tower temperature of each of the drying towers. The controller is also used to execute the control method of the gas production system as described in any one of claims 1 to 4.

6. The gas production system according to claim 5, characterized in that: The dryer comprises: a first drying tower, a second drying tower and a third drying tower; wherein: The inlet of the first drying tower serves as the inlet of the dryer, the outlet of the first drying tower is connected to the inlet of the second drying tower, the outlet of the second drying tower is connected to the inlet of the third drying tower, and the outlet of the third drying tower serves as the outlet of the dryer; The first drying tower, the second drying tower and the third drying tower all have a heating function, and the start and stop of the heating function of the first drying tower, the start and stop of the heating function of the second drying tower and the start and stop of the heating function of the third drying tower are all controlled by the controller.

7. The gas production system according to claim 6, characterized in that: The dryer further comprises: a first cooler, a second cooler and a third cooler; wherein: The outlet of the first cooler is connected to the inlet of the first drying tower, and the inlet of the first cooler serves as the inlet of the dryer; The inlet of the second cooler is connected to the outlet of the second drying tower, and the outlet of the second cooler is connected to the inlet of the third cooler; The outlet of the third cooler is connected to the inlet of the third drying tower.

8. The gas production system according to claim 5, characterized in that: The dryer comprises: a fourth drying tower and a fifth drying tower; wherein: The inlet of the fourth drying tower serves as the inlet of the dryer, the outlet of the fourth drying tower is connected to the inlet of the fifth drying tower, and the outlet of the fifth drying tower serves as the outlet of the dryer; The fourth drying tower and the fifth drying tower both have a heating function, and the start and stop of the heating function of the fourth drying tower and the start and stop of the heating function of the fifth drying tower are both controlled by the controller.

9. The gas production system according to claim 8, characterized in that: The dryer further comprises: a fourth cooler and a fifth cooler; wherein: The inlet of the fourth cooler is connected to the outlet of the fourth drying tower, the outlet of the fourth cooler is connected to the inlet of the fifth cooler, and the outlet of the fifth cooler is connected to the inlet of the fifth drying tower.

10. The gas production system according to any one of claims 5 to 9, characterized in that: The gas produced by the gas production device includes hydrogen.

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