Self-humidifying hydrogen catalytic combustion system based on backflow and method thereof

Abstract

The invention discloses a self-humidifying hydrogen catalytic combustion adjusting system based on backflow and a method of the self-humidifying hydrogen catalytic combustion adjusting system. The self-humidifying adjusting hydrogen catalytic combustion system based on backflow comprises an oxygen supply component, a hydrogen supply component, a mixed gas pressure detection component, a mixed gas humidity detection component, a mixed gas hydrogen concentration detection component, a hydrogen catalytic combustion reactor, a post-reaction hydrogen concentration detection component and a reaction gas circulation component. The self-humidifying adjusting hydrogen catalytic combustion system based on backflow is simple in structure and low in energy consumption, catalytic combustion of unutilized hydrogen can be safely, stably and thoroughly achieved, and the problem that hydrogen combustion is insufficient in the hydrogen catalytic combustion starting stage is solved.

Description

Technical Field

[0001] The present application relates to the field of energy technology, and in particular to a reflux-based self-humidification regulating hydrogen catalytic combustion system and method thereof. Background Art

[0002] As the most abundant element in the universe, hydrogen energy has the characteristics of wide sources, rich application scenarios, high calorific value, zero carbon emissions, and renewable. It is regarded as the energy with the greatest development potential in the 21st century. At present, hydrogen energy has been widely used in transportation, industry, electronics, construction and other fields. At the same time, hydrogen energy can also be used as an energy reserve to solve the energy crisis. Therefore, the hydrogen energy industry will usher in a huge development opportunity. With the rapid development of the hydrogen energy industry, the treatment of some leaked and unused hydrogen in the process of hydrogen storage, transportation and use has also received more and more attention. On the one hand, the emission of hydrogen in a closed or poorly ventilated environment is prone to cause the accumulation of hydrogen and bring the risk of combustion and explosion, such as hydrogen-powered submarines, hydrogen-powered subways, hydrogen-powered mining cars and other closed or semi-closed use scenarios; on the other hand, although hydrogen is a clean energy, it can react with ozone in the stratosphere to destroy the ozone layer, and hydrogen will react with hydroxyl radicals in the air, resulting in a decrease in hydroxyl radicals that react with methane in the atmosphere. Large amounts of hydrogen emissions will also intensify the greenhouse effect.

[0003] Hydrogen catalytic combustion technology is an effective technology for treating unused hydrogen. It mainly passes a hydrogen-oxygen mixture with a certain hydrogen concentration through a reactor carrying a Pd or Pt-based catalyst, and reacts with hydrogen to generate water under the action of the catalyst, thereby achieving effective hydrogen consumption and avoiding the direct discharge of high-concentration hydrogen into the air. In hydrogen catalytic combustion technology, there are many factors that affect the effect of hydrogen catalytic combustion, and one important aspect is the content of water vapor, that is, the humidity of the gas. In the existing hydrogen catalytic combustion technology, the hydrogen removal system without humidification is prone to high hydrogen reaction temperature, long combustion flame propagation distance, and uneven gas mixing; the hydrogen catalytic combustion system has a low hydrogen removal rate in the startup phase, and there is no reaction gas circulation, which is easy to cause incompletely reacted hydrogen to be directly discharged. The humidifier of the hydrogen removal system containing a humidifier has large power consumption and volume, which increases the cost of use and the volume of space layout. Summary of the invention

[0004] Based on this, it is necessary to provide a self-humidifying and regulating hydrogen catalytic combustion system based on reflux. The self-humidifying and regulating hydrogen catalytic combustion system based on reflux of the present invention has a simple structure and low energy consumption, and can realize safe, stable and thorough catalytic combustion of unused hydrogen, solving the problem of insufficient hydrogen combustion in the startup stage of hydrogen catalytic combustion.

[0005] An embodiment of the present application provides a self-humidification regulating hydrogen catalytic combustion system based on reflux.

[0006] A self-humidification regulating hydrogen catalytic combustion system based on reflux, comprising an oxygen supply component, a hydrogen supply component, a mixed gas pressure detection component, a mixed gas humidity detection component, a mixed gas hydrogen concentration detection component, a hydrogen catalytic combustion reactor, a post-reaction hydrogen concentration detection component and a reaction gas circulation component, wherein the oxygen supply component and the hydrogen supply component are connected in parallel to the hydrogen catalytic combustion reactor through a mixing pipe, the hydrogen catalytic combustion reactor is also connected to the reaction gas circulation component through a reflux pipe, the reaction gas circulation component is arranged in the mixing pipe for refluxing the reacted gas carrying water vapor, the mixed gas pressure detection component, the mixed gas humidity detection component and the mixed gas hydrogen concentration detection component are arranged on the mixing pipe, the mixed gas pressure detection component is used to monitor the pressure of the mixed gas in the mixing pipe, so as to provide the pressure of the air inlet of the hydrogen catalytic combustion reactor Regulation, the mixed gas humidity detection component is used to monitor the humidity of the mixed gas in the mixing pipe to adjust the flow rate of the reflux gas in the reflux pipe, the mixed gas hydrogen concentration detection component is used to monitor the hydrogen concentration of the mixed gas in the mixing pipe to regulate the hydrogen ratio in the mixed gas, the hydrogen catalytic combustion reactor is filled with at least a Pd-based catalyst and a Pt-based catalyst for realizing hydrogen catalytic combustion, the exhaust port of the hydrogen catalytic combustion reactor is connected to an exhaust pipe, and the mixing pipe is also connected to a safety discharge pipeline; the post-reaction hydrogen concentration detection component is arranged on the exhaust pipe, and the post-reaction hydrogen concentration detection component is used to monitor the hydrogen concentration of the gas entering the exhaust pipe after the hydrogen elimination reaction, so as to judge whether it is necessary to circulate all the gas entering the exhaust pipe after the reaction to the mixing pipe for secondary reaction according to the hydrogen concentration after hydrogen elimination.

[0007] In some embodiments, the oxygen supply component includes an oxygen supply pipeline, an oxygen supply pump, an oxygen flow meter, and an oxygen pressure detection component. One end of the oxygen supply pipeline is connected to an oxygen source, and the other end of the oxygen supply pipeline is connected to the mixing pipeline. The oxygen supply pump, the oxygen flow meter, and the oxygen pressure detection component are respectively arranged on the oxygen supply pipeline.

[0008] In some embodiments, the hydrogen supply component includes a hydrogen supply pipeline, a hydrogen supply pump, a hydrogen flowmeter, and a hydrogen pressure detection component. One end of the hydrogen supply pipeline is connected to a hydrogen source, and the other end of the hydrogen supply pipeline is connected to the mixing pipeline. The hydrogen supply pump, the hydrogen flowmeter and the hydrogen pressure detection component are respectively arranged on the hydrogen supply pipeline.

[0009] In some of the embodiments, the reflux-based self-humidification regulation hydrogen catalytic combustion system also includes a reactor temperature detection component, which is connected to the hydrogen catalytic combustion reactor. The reactor temperature detection component is used to monitor the reaction temperature in the hydrogen catalytic combustion reactor to adjust and correct the hydrogen concentration in the mixed gas in the mixing pipe to prevent excessive hydrogen concentration from causing violent reaction and excessive temperature.

[0010] In some of the embodiments, the reflux-based self-humidification regulated hydrogen catalytic combustion system further includes an exhaust solenoid valve, which is disposed on the exhaust pipe to control the discharge of the post-reaction gas.

[0011] In some of the embodiments, the reflux-based self-humidification regulated hydrogen catalytic combustion system also includes a safety valve, which is arranged on the safety discharge pipeline to discharge the mixed gas in the mixing pipeline in emergency situations including fire and severe overheating.

[0012] In some embodiments, the return pipe is connected to a position on the mixing pipe between the mixed gas pressure detection component and the mixed gas humidity detection component.

[0013] In some of the embodiments, the reflux-based self-humidification regulated hydrogen catalytic combustion system further includes a flame arrester, which is disposed on the mixing pipe and is close to the hydrogen catalytic combustion reactor.

[0014] In some embodiments, the reaction gas circulation component includes a gas circulation pump, and the gas circulation pump is used to control the flow rate of the circulating gas by controlling the rotation speed;

[0015] Alternatively, the reaction gas circulation component includes a proportional solenoid valve and an ejector, the proportional solenoid valve is arranged on the reflux pipe, the ejector is arranged on the mixing pipe, the reflux pipe is connected to the ejector, the proportional solenoid valve is used to control the flow rate of the circulating gas by adjusting the duty cycle, and the ejector is used to control the flow rate of the circulating gas by adjusting its throat diameter.

[0016] An embodiment of the present application also provides a method for regulating hydrogen catalytic combustion by self-humidification based on reflux.

[0017] A method for regulating hydrogen catalytic combustion by self-humidification based on reflux, using the above-mentioned self-humidification regulating hydrogen catalytic combustion system based on reflux, comprises the following steps:

[0018] The oxygen supply component and the hydrogen supply component are controlled to supply gas respectively, and the gas is mixed according to the target hydrogen concentration requirement. The mixed gas enters the hydrogen catalytic combustion reactor through the mixing pipe for catalytic combustion reaction, and the gas after the catalytic combustion reaction enters the exhaust pipe or the reflux pipe;

[0019] When the hydrogen concentration C in the reacted gas is greater than or equal to the threshold value C1, it means that the hydrogen concentration in the reacted gas is too high and the hydrogen reaction is not complete. The exhaust pipe is closed and the reacted gas is controlled to enter the mixing pipe after passing through the reflux pipe for secondary reaction, where C1 is a target hydrogen concentration greater than or equal to 5%;

[0020] When the hydrogen concentration C in the gas after the reaction is less than the threshold C1, it is determined whether the humidity H of the gas after the reaction is greater than the threshold H1, and the threshold H1 is 50%;

[0021] When the humidity H of the gas after the reaction is greater than or equal to the threshold value H1, the gas after the reaction is controlled to be discharged from the exhaust pipe. When the humidity H of the gas after the reaction is less than the threshold value H1, part of the gas after the reaction is controlled to enter the reflux pipe. According to the mixed gas humidity requirement, the reaction gas circulation component is controlled to adjust the humidity of the mixed gas in the mixing pipe to the target humidity range.

[0022] The above-mentioned self-humidification regulating hydrogen catalytic combustion system based on reflux can be applied to the field of hydrogen catalytic combustion technology. By adopting a circulating reflux method, the gas carrying water vapor after the reaction re-enters the mixing pipe, and the humidity of the mixed gas in the mixing pipe is increased, which can effectively solve the problems of high hydrogen reaction temperature, long combustion flame propagation distance, and uneven gas mixing, so that the hydrogen catalytic combustion reaction can be carried out smoothly and safely, and the problem of insufficient hydrogen combustion in the startup stage of hydrogen catalytic combustion is solved, and secondary reaction and complete hydrogen elimination are achieved; the present application can cancel the use of a humidifier or reduce the specifications of the humidifier, saving energy consumption and system space. Specifically, the above-mentioned self-humidification regulating hydrogen catalytic combustion system based on reflux is based on the real-time numerical feedback of the mixed gas humidity detection component at the front end of the hydrogen catalytic combustion reactor, and controls the flow rate of the reacted gas after the reflux circulation by controlling the reaction gas circulation component to achieve the purpose of humidifying the mixed gas, and then judges whether it is necessary to circulate all the reacted gas according to the real-time numerical feedback of the hydrogen concentration detected by the hydrogen concentration detection component after the reaction at the rear end of the hydrogen catalytic combustion reactor, so as to achieve the purpose of completely eliminating hydrogen.

[0023] In summary, the self-humidification regulating hydrogen catalytic combustion system based on reflux proposed in this application has the following advantages:

[0024] (1) By humidifying the gas reflux after the reaction, the specifications of the humidifier can be reduced or the humidifier in the system can be omitted, saving space and energy consumption.

[0025] (2) The humidified mixed gas can effectively solve the problems of high hydrogen reaction temperature, long combustion flame propagation distance and uneven gas mixing.

[0026] (3) Solve the problems of low hydrogen catalytic combustion rate and incomplete hydrogen catalytic combustion during the startup phase of the hydrogen catalytic combustion system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0028] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0029] FIG1 is a schematic diagram of a self-humidification regulating hydrogen catalytic combustion system based on reflux according to an embodiment of the present invention;

[0030] FIG2 is a schematic diagram of a self-humidification regulating hydrogen catalytic combustion system based on reflux according to another embodiment of the present invention;

[0031] FIG3 is a schematic diagram of a self-humidification regulating hydrogen catalytic combustion system based on reflux according to another embodiment of the present invention;

[0032] FIG4 is a schematic diagram of a method for regulating hydrogen catalytic combustion by self-humidification based on reflux according to an embodiment of the present invention.

[0033] Description of Reference Numerals

[0034] 10. Self-humidification regulating hydrogen catalytic combustion system based on reflux; 100. Oxygen supply component; 200. Hydrogen supply component; 300. Mixed gas pressure detection component; 400. Mixed gas humidity detection component; 500. Mixed gas hydrogen concentration detection component; 600. Flame arrester; 700. Hydrogen catalytic combustion reactor; 800. Reactor temperature detection component; 900. Post-reaction hydrogen concentration detection component; 1000. Exhaust solenoid valve; 1100. Reaction gas circulation component; 1101. Gas circulation pump; 1102. Proportional solenoid valve; 1103. Ejector; 1200. Safety valve; 101. Mixing pipe; 102. Reflux pipe; 103. Exhaust pipe; 104. Safety discharge pipeline. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In this article, "optionally", "optional", "optional" means optional, that is, it means to be selected from any of the two parallel solutions of "yes" or "no". If there are multiple "optional" in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "optional" is independent. In this application, the descriptions such as "optionally contain" and "optionally include" mean "contain or not contain".

[0041] In the present application, when it comes to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional numerical values ​​in the numerical interval is considered to be continuous, and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical interval, and each numerical value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to an integer in the numerical interval, it includes the two endpoint integers of the numerical range, and each integer between the two endpoints, which is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical range disclosed in the present application should be understood to include any and all sub-ranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. "Numerical interval" allows for a broad range of quantitative intervals such as percentage intervals, ratio intervals, and ratio intervals.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0043] The embodiment of the present application provides a self-humidifying and regulating hydrogen catalytic combustion system based on reflux to solve at least one of the following technical problems in the prior art: (1) The power consumption and volume of the humidifier in the hydrogen catalytic combustion system are both large, which increases the use cost and the volume of the space arrangement; (2) The hydrogen elimination system without humidification is prone to high hydrogen reaction temperature, long combustion flame propagation distance, and uneven gas mixing; (3) The hydrogen elimination rate of the hydrogen catalytic combustion system in the startup phase is low, and there is no reaction gas circulation reflux, which is prone to direct emission of incompletely reacted hydrogen. The self-humidifying and regulating hydrogen catalytic combustion system based on reflux will be described below in conjunction with the accompanying drawings.

[0044] The self-humidifying and regulating hydrogen catalytic combustion system 10 based on reflux provided in the embodiment of the present application is exemplarily shown in FIG1 , which is a structural schematic diagram of the self-humidifying and regulating hydrogen catalytic combustion system 10 based on reflux provided in the embodiment of the present application. The self-humidifying and regulating hydrogen catalytic combustion system 10 based on reflux of the present application can be used for hydrogen catalytic combustion purposes.

[0045] In order to more clearly illustrate the structure of the reflux-based self-humidification regulation hydrogen catalytic combustion system 10 , the reflux-based self-humidification regulation hydrogen catalytic combustion system 10 will be introduced below with reference to the accompanying drawings.

[0046] For example, please refer to Figure 1, a reflux-based self-humidification regulated hydrogen catalytic combustion system 10 includes an oxygen supply component 100, a hydrogen supply component 200, a mixed gas pressure detection component 300, a mixed gas humidity detection component 400, a mixed gas hydrogen concentration detection component 500, a hydrogen catalytic combustion reactor 700, a post-reaction hydrogen concentration detection component 900 and a reaction gas circulation component 1100.

[0047] The oxygen supply component 100 is connected in parallel with the hydrogen supply component 200 and is connected to the hydrogen catalytic combustion reactor 700 through the mixing pipe 101. The hydrogen catalytic combustion reactor 700 is also connected to the reaction gas circulation component 1100 through the reflux pipe 102. The reaction gas circulation component 1100 is arranged in the mixing pipe 101 for reflux of the reacted gas carrying water vapor. The mixing pipe 101 is provided with a mixed gas pressure detection component 300, a mixed gas humidity detection component 400, and a mixed gas hydrogen concentration detection component 500. The mixed gas pressure detection component 300 is used to monitor the pressure of the mixed gas in the mixing pipe 101 for pressure regulation of the air inlet of the hydrogen catalytic combustion reactor 700. The mixed gas humidity detection component 400 is used to monitor the humidity of the mixed gas in the mixing pipe 101 for regulating the flow rate of the reflux gas in the reflux pipe 102. The mixed gas hydrogen concentration detection component 500 is used to monitor the hydrogen concentration of the mixed gas in the mixing pipe 101 to regulate the hydrogen ratio in the mixed gas. The hydrogen catalytic combustion reactor 700 is filled with at least a Pd-based catalyst and a Pt-based catalyst for realizing hydrogen catalytic combustion. The exhaust port of the hydrogen catalytic combustion reactor 700 is connected to an exhaust pipe 103. The mixing pipe 101 is also connected to a safety discharge pipeline 104. The post-reaction hydrogen concentration detection component 900 is arranged on the exhaust pipe 103. The post-reaction hydrogen concentration detection component 900 is used to monitor the hydrogen concentration of the gas entering the exhaust pipe 103 after the hydrogen elimination reaction, so as to judge whether it is necessary to circulate all the gas entering the exhaust pipe 103 after the reaction to the mixing pipe 101 for secondary reaction according to the hydrogen concentration after the hydrogen elimination.

[0048] The above-mentioned reflux-based self-humidification and regulation hydrogen catalytic combustion system 10 can be applied to the field of hydrogen catalytic combustion technology. It adopts a circulating reflux method to allow the gas carrying water vapor after the reaction to re-enter the mixing pipe 101, thereby increasing the humidity of the mixed gas in the mixing pipe 101. It can effectively solve the problems of high hydrogen reaction temperature, long combustion flame propagation distance, and uneven gas mixing, so that the hydrogen catalytic combustion reaction can proceed smoothly and safely, and solve the problem of insufficient hydrogen combustion in the startup stage of hydrogen catalytic combustion, so as to achieve secondary reaction and complete hydrogen elimination. The present application can eliminate the use of a humidifier or reduce the specifications of the humidifier, saving energy consumption and system space. Specifically, the above-mentioned reflux-based self-humidification regulating hydrogen catalytic combustion system 10 controls the flow rate of the post-reaction gas refluxed by controlling the reaction gas circulation component 1100 according to the real-time numerical feedback of the mixed gas humidity detection component 400 at the front end of the hydrogen catalytic combustion reactor 700, so as to achieve the purpose of humidifying the mixed gas, and then judges whether it is necessary to circulate all the post-reaction gases according to the real-time numerical feedback of the hydrogen concentration detected by the post-reaction hydrogen concentration detection component 900 at the rear end of the hydrogen catalytic combustion reactor 700 to achieve the purpose of completely eliminating hydrogen.

[0049] In some embodiments, the oxygen supply component 100 includes an oxygen supply pipeline, an oxygen supply pump, an oxygen flow meter, and an oxygen pressure detection component. One end of the oxygen supply pipeline is connected to the oxygen source, and the other end of the oxygen supply pipeline is connected to the mixing pipeline 101. The oxygen supply pump, the oxygen flow meter, and the oxygen pressure detection component are respectively arranged on the oxygen supply pipeline. The oxygen supply pump, the oxygen flow meter, and the oxygen pressure detection component are not shown in the drawings.

[0050] In some embodiments, the hydrogen supply component 200 includes a hydrogen supply pipeline, a hydrogen supply pump, a hydrogen flow meter, and a hydrogen pressure detection component. One end of the hydrogen supply pipeline is connected to a hydrogen source, and the other end of the hydrogen supply pipeline is connected to the mixing pipeline 101. The hydrogen supply pump, the hydrogen flow meter, and the hydrogen pressure detection component are respectively arranged on the hydrogen supply pipeline. The hydrogen supply pump, the hydrogen flow meter, and the hydrogen pressure detection component are not shown in the drawings.

[0051] In some embodiments, the reflux-based self-humidification regulating hydrogen catalytic combustion system 10 further includes a reactor temperature detection component 800. The reactor temperature detection component 800 is connected to the hydrogen catalytic combustion reactor 700. The reactor temperature detection component 800 is used to monitor the reaction temperature in the hydrogen catalytic combustion reactor 700 to adjust and correct the hydrogen concentration in the mixed gas in the mixing pipe 101 to prevent excessive hydrogen concentration from causing violent reaction and excessive temperature.

[0052] In some of the embodiments, the above-mentioned oxygen pressure detection component, hydrogen pressure detection component, mixed gas pressure detection component 300, mixed gas humidity detection component 400, mixed gas hydrogen concentration detection component 500, and reactor temperature detection component 800 can be sensors for detecting corresponding parameters respectively.

[0053] In some of the embodiments, the reflux-based self-humidification regulating hydrogen catalytic combustion system 10 further includes an exhaust solenoid valve 1000. The exhaust solenoid valve 1000 is disposed on the exhaust pipe 103 to control the discharge of the post-reaction gas.

[0054] In some embodiments, the reflux-based self-humidification regulated hydrogen catalytic combustion system 10 further includes a safety valve 1200. The safety valve 1200 is disposed on the safety discharge pipeline 104 to discharge the mixed gas in the mixing pipeline 101 in emergency situations including fire and severe over-temperature.

[0055] In some embodiments, the return pipe 102 is connected to a position on the mixing pipe 101 between the mixed gas pressure detection component 300 and the mixed gas humidity detection component 400 .

[0056] In some of the embodiments, the reflux-based self-humidification regulation hydrogen catalytic combustion system 10 further includes a flame arrester 600. The flame arrester 600 is disposed on the mixing pipe 101, and the flame arrester 600 is close to the hydrogen catalytic combustion reactor 700.

[0057] In some embodiments, referring to FIG2 , FIG2 is a schematic diagram of a self-humidifying regulated hydrogen catalytic combustion system 10 based on reflux according to another embodiment of the present invention, and the reaction gas circulation component 1100 includes a gas circulation pump 1101. The gas circulation pump 1101 is used to control the flow rate of the circulating gas by controlling the rotation speed.

[0058] In some of the embodiments, referring to FIG3 , FIG3 is a schematic diagram of a self-humidifying regulated hydrogen catalytic combustion system 10 based on reflux according to another embodiment of the present invention, and the reaction gas circulation component 1100 includes a proportional solenoid valve 1102 and an ejector 1103. The proportional solenoid valve 1102 is arranged on the reflux pipe 102. The ejector 1103 is arranged on the mixing pipe 101. The reflux pipe 102 is connected to the ejector 1103. The proportional solenoid valve 1102 is used to control the flow rate of the circulating gas by adjusting the duty cycle, and the ejector 1103 is used to control the flow rate of the circulating gas by adjusting its throat diameter.

[0059] An embodiment of the present application also provides a method for regulating hydrogen catalytic combustion by self-humidification based on reflux.

[0060] It should be noted that, in this article, unless otherwise specified, each reaction step can be carried out in the order described herein, or can be carried out in a non-sequential manner. For example, other steps may be included between each reaction step, and the order of the reaction steps may also be appropriately swapped. This can be determined by the technician based on conventional knowledge and experience. Preferably, the reaction method herein is carried out sequentially.

[0061] Referring to FIG. 4 , FIG. 4 is a schematic diagram of a method for regulating hydrogen catalytic combustion based on self-humidification based on reflux according to an embodiment of the present invention. A method for regulating hydrogen catalytic combustion based on self-humidification based on reflux, using the above-mentioned self-humidification regulating hydrogen catalytic combustion system 10 based on reflux, comprises the following steps:

[0062] The oxygen supply component 100 and the hydrogen supply component 200 are controlled to supply gas respectively, and the gas is mixed according to the target hydrogen concentration requirement. The mixed gas enters the hydrogen catalytic combustion reactor 700 through the mixing pipe 101 for catalytic combustion reaction. The gas after the catalytic combustion reaction enters the exhaust pipe 103 or the reflux pipe 102.

[0063] When the hydrogen concentration C in the gas after the reaction is greater than or equal to the threshold value C1, it means that the hydrogen concentration in the gas after the reaction is too high and the hydrogen reaction is not complete. The exhaust pipe 103 is closed and the gas after the reaction is controlled to pass through the reflux pipe 102 and then enter the mixing pipeline for secondary reaction, where C1 is greater than or equal to 5% of the target hydrogen concentration.

[0064] When the hydrogen concentration C in the gas after the reaction is less than the threshold value C1, it is determined whether the humidity H of the gas after the reaction is greater than the threshold value H1, and the threshold value H1 is 50%.

[0065] When the humidity H of the gas after the reaction is greater than or equal to the threshold value H1, the gas after the reaction is controlled to be discharged from the exhaust pipe 103. When the humidity H of the gas after the reaction is less than the threshold value H1, part of the gas after the reaction is controlled to enter the reflux pipe 102. According to the mixed gas humidity requirement, the reaction gas circulation component 1100 is controlled to adjust the humidity of the mixed gas in the mixing pipe to the target humidity range.

[0066] Example 1

[0067] This embodiment provides a self-humidification regulating hydrogen catalytic combustion system 10 based on reflux.

[0068] The reflux-based self-humidification regulated hydrogen catalytic combustion system 10 of this embodiment includes: an oxygen supply component 100, a hydrogen supply component 200, a mixed gas pressure detection component 300, a mixed gas humidity detection component 400, a mixed gas hydrogen concentration detection component 500, a flame arrester 600, a hydrogen catalytic combustion reactor 700, a reactor temperature detection component 800, a post-reaction hydrogen concentration detection component 900, an exhaust solenoid valve 1000, a reaction gas circulation component 1100 and a safety valve 1200. The oxygen supply component 100 is connected in parallel with the hydrogen supply component 200 and is connected to the hydrogen catalytic combustion reactor 700 through the mixing pipe 101. The hydrogen catalytic combustion reactor 700 is also connected to the reaction gas circulation component 1100 through the reflux pipe 102. The reaction gas circulation component 1100 is arranged in the mixing pipe 101. The mixing pipe 101 is provided with a mixed gas pressure detection component 300, a mixed gas humidity detection component 400, and a mixed gas hydrogen concentration detection component 500. The reactor temperature detection component 800 is connected to the hydrogen catalytic combustion reactor 700. The exhaust port of the hydrogen catalytic combustion reactor 700 is connected to the exhaust pipe 103. The post-reaction hydrogen concentration detection component 900 and the exhaust solenoid valve 1000 are arranged in the exhaust pipe 103. The mixing pipe 101 is also connected to a safety discharge pipeline 104, and a safety valve 1200 is arranged on the safety discharge pipeline 104.

[0069] In the self-humidification regulation hydrogen catalytic combustion system 10 based on reflux in this embodiment, the combustion modes of the mixture of hydrogen, air (oxygen) and water vapor include diffusion flame, slow or accelerated deflagration and explosion. The combustion mode of hydrogen is determined by the hydrogen concentration, initial conditions and boundary conditions, wherein the initial water vapor concentration in the initial conditions has an important influence on the hydrogen combustion mode. On the one hand, water vapor can reduce the peak temperature and peak pressure of hydrogen combustion. Since the presence of water vapor will increase the specific heat capacity of the entire mixed gas, under the condition of equal hydrogen concentration, the presence of water vapor will cause the maximum temperature and maximum pressure generated by combustion to decrease significantly, effectively avoiding the agglomeration and deactivation of the catalyst at high temperature. At the same time, the reduction of the maximum reaction temperature can increase the service life of the reactor; on the other hand, the increase of water vapor concentration will reduce the flame propagation speed, and has a significant blocking effect on the propagation of the hydrogen combustion flame. If flashback occurs during the catalytic combustion process, the flame can be prevented from diffusing from the boundary layer of the hydrogen catalytic combustion device to the system pipeline, thereby improving the safety of the hydrogen catalytic combustion system; in addition, water vapor plays the role of an inert gas, and the flow accelerates the mixing of hydrogen to avoid local condensation of water vapor. In the hydrogen catalytic combustion reactor 700, the product of hydrogen catalytic combustion is water. Under high-temperature reaction conditions, it is usually discharged in the form of water vapor along with the reacted gas. However, the present application recycles the reacted gas rich in water vapor back to the mixing pipe 101 at the front end of the hydrogen catalytic combustion reactor 700, which can not only humidify the gas, but also control the humidity of the mixed gas by controlling the amount of circulating gas. In addition, at the initial startup stage of the hydrogen catalytic combustion system, due to the uneven reaction temperature, it is easy to cause insufficient hydrogen reaction and low hydrogen elimination rate. By recirculating the incompletely reacted mixed gas to the hydrogen catalytic combustion reactor 700, secondary hydrogen elimination is achieved, and the unreacted hydrogen can be completely catalytically burned.

[0070] In summary, the self-humidification regulating hydrogen catalytic combustion system 10 based on reflux proposed in the present application has the following advantages:

[0071] (1) By humidifying the gas reflux after the reaction, the specifications of the humidifier can be reduced or the humidifier in the system can be omitted, saving space and energy consumption.

[0072] (2) The humidified mixed gas can effectively solve the problems of high hydrogen reaction temperature, long combustion flame propagation distance and uneven gas mixing.

[0073] (3) Solve the problems of low hydrogen catalytic combustion rate and incomplete hydrogen catalytic combustion during the startup phase of the hydrogen catalytic combustion system.

[0074] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0075] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A self-humidifying and regulating hydrogen catalytic combustion system based on reflux, characterized in that: The invention comprises an oxygen supply component, a hydrogen supply component, a mixed gas pressure detection component, a mixed gas humidity detection component, a mixed gas hydrogen concentration detection component, a hydrogen catalytic combustion reactor, a post-reaction hydrogen concentration detection component and a reaction gas circulation component. The oxygen supply component is connected to the hydrogen supply component in parallel with the hydrogen supply component through a mixing pipe, and the hydrogen catalytic combustion reactor is also connected to the reaction gas circulation component through a reflux pipe. The reaction gas circulation component is arranged in the mixing pipe for refluxing the reacted gas carrying water vapor. The mixed gas pressure detection component, the mixed gas humidity detection component and the mixed gas hydrogen concentration detection component are arranged on the mixing pipe. The mixed gas pressure detection component is used to monitor the pressure of the mixed gas in the mixing pipe for pressure regulation of the air inlet of the hydrogen catalytic combustion reactor. The component is used to monitor the humidity of the mixed gas in the mixing pipe so as to adjust the flow rate of the reflux gas in the reflux pipe. The mixed gas hydrogen concentration detection component is used to monitor the hydrogen concentration of the mixed gas in the mixing pipe so as to regulate the hydrogen ratio in the mixed gas. The hydrogen catalytic combustion reactor is filled with at least a Pd-based catalyst and a Pt-based catalyst for realizing hydrogen catalytic combustion. The exhaust port of the hydrogen catalytic combustion reactor is connected to an exhaust pipe, and the mixing pipe is also connected to a safety discharge pipeline; the post-reaction hydrogen concentration detection component is arranged on the exhaust pipe, and the post-reaction hydrogen concentration detection component is used to monitor the hydrogen concentration of the gas entering the exhaust pipe after the hydrogen elimination reaction, so as to judge whether it is necessary to circulate all the gas entering the exhaust pipe after the reaction to the mixing pipe for secondary reaction according to the hydrogen concentration after hydrogen elimination.

2. The self-humidification regulating hydrogen catalytic combustion system based on reflux according to claim 1 is characterized in that: The oxygen supply component includes an oxygen supply pipeline, an oxygen supply pump, an oxygen flow meter, and an oxygen pressure detection component. One end of the oxygen supply pipeline is connected to an oxygen source, and the other end of the oxygen supply pipeline is connected to the mixing pipeline. The oxygen supply pump, the oxygen flow meter, and the oxygen pressure detection component are respectively arranged on the oxygen supply pipeline.

3. The self-humidification regulating hydrogen catalytic combustion system based on reflux according to claim 1 is characterized in that: The hydrogen supply component includes a hydrogen supply pipeline, a hydrogen supply pump, a hydrogen flowmeter, and a hydrogen pressure detection component. One end of the hydrogen supply pipeline is connected to a hydrogen source, and the other end of the hydrogen supply pipeline is connected to the mixing pipeline. The hydrogen supply pump, the hydrogen flowmeter, and the hydrogen pressure detection component are respectively arranged on the hydrogen supply pipeline.

4. The self-humidification regulating hydrogen catalytic combustion system based on reflux according to claim 1 is characterized in that: The reflux-based self-humidification regulation hydrogen catalytic combustion system also includes a reactor temperature detection component, which is connected to the hydrogen catalytic combustion reactor. The reactor temperature detection component is used to monitor the reaction temperature in the hydrogen catalytic combustion reactor to adjust and correct the hydrogen concentration in the mixed gas in the mixing pipeline to prevent excessive hydrogen concentration from causing violent reaction and excessive temperature.

5. The self-humidification regulating hydrogen catalytic combustion system based on reflux according to any one of claims 1 to 4, characterized in that: The reflux-based self-humidification regulating hydrogen catalytic combustion system further includes an exhaust solenoid valve, which is disposed on the exhaust pipe to control the discharge of the post-reaction gas.

6. The self-humidification regulating hydrogen catalytic combustion system based on reflux according to any one of claims 1 to 4, characterized in that: The reflux-based self-humidification regulated hydrogen catalytic combustion system also includes a safety valve, which is arranged on the safety discharge pipeline to discharge the mixed gas in the mixing pipeline in emergency situations including fire and severe overheating.

7. The self-humidification regulating hydrogen catalytic combustion system based on reflux according to any one of claims 1 to 4, characterized in that: The return pipe is connected to a position on the mixing pipe between the mixed gas pressure detection component and the mixed gas humidity detection component.

8. The self-humidification regulating hydrogen catalytic combustion system based on reflux according to any one of claims 1 to 4, characterized in that: The reflux-based self-humidification regulation hydrogen catalytic combustion system further includes a flame arrester, which is disposed on the mixing pipe and is close to the hydrogen catalytic combustion reactor.

9. The self-humidification regulating hydrogen catalytic combustion system based on reflux according to any one of claims 1 to 4, characterized in that: The reaction gas circulation component includes a gas circulation pump, and the gas circulation pump is used to control the flow rate of the circulating gas by controlling the rotation speed; Alternatively, the reaction gas circulation component includes a proportional solenoid valve and an ejector, the proportional solenoid valve is arranged on the reflux pipe, the ejector is arranged on the mixing pipe, the reflux pipe is connected to the ejector, the proportional solenoid valve is used to control the flow rate of the circulating gas by adjusting the duty cycle, and the ejector is used to control the flow rate of the circulating gas by adjusting its throat diameter.

10. A method for regulating hydrogen catalytic combustion by self-humidification based on reflux, characterized in that: The self-humidification regulating hydrogen catalytic combustion system based on reflux according to any one of claims 1 to 9 comprises the following steps: The oxygen supply component and the hydrogen supply component are controlled to supply gas respectively, and the gas is mixed according to the target hydrogen concentration requirement. The mixed gas enters the hydrogen catalytic combustion reactor through the mixing pipe for catalytic combustion reaction, and the gas after the catalytic combustion reaction enters the exhaust pipe or the reflux pipe; When the hydrogen concentration C in the reacted gas is greater than or equal to the threshold value C1, it means that the hydrogen concentration in the reacted gas is too high and the hydrogen reaction is not complete. The exhaust pipe is closed and the reacted gas is controlled to enter the mixing pipe after passing through the reflux pipe for secondary reaction, where C1 is a target hydrogen concentration greater than or equal to 5%; When the hydrogen concentration C in the gas after the reaction is less than the threshold C1, it is determined whether the humidity H of the gas after the reaction is greater than the threshold H1, and the threshold H1 is 50%; When the humidity H of the gas after the reaction is greater than or equal to the threshold value H1, the gas after the reaction is controlled to be discharged from the exhaust pipe. When the humidity H of the gas after the reaction is less than the threshold value H1, part of the gas after the reaction is controlled to enter the reflux pipe. According to the mixed gas humidity requirement, the reaction gas circulation component is controlled to adjust the humidity of the mixed gas in the mixing pipe to the target humidity range.

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