Hydrogen elimination control method and hydrogen elimination system without obtaining hydrogen concentration

Abstract

The invention discloses a hydrogen elimination control method and a hydrogen elimination system without obtaining hydrogen concentration. According to the hydrogen elimination control method without obtaining the hydrogen concentration, through early-stage data calibration, a hydrogen concentration sensor with the high price is omitted in the actual hydrogen elimination process, duty ratio control is started based on the inlet and outlet gas pressure of the hydrogen path and the hydrogen regulation and control component, the gas output of hydrogen is controlled, and air (oxygen) flow regulation is correspondingly carried out; the hydrogen mixing concentration is within a safety threshold range or a target concentration range; and meanwhile, the temperature of the dehydrogenation reactor is monitored, and hydrogen flow correction is performed based on the reaction temperature, so that multi-dimensional dehydrogenation safety control without a hydrogen concentration sensor is realized.

Description

Technical Field

[0001] The present application relates to the field of energy technology, and in particular to a hydrogen elimination control method and a hydrogen elimination system without obtaining hydrogen concentration. Background Art

[0002] As global energy shortages and environmental issues become increasingly prominent, the development and utilization of low-carbon, clean, and renewable energy is urgent. Hydrogen energy, as the most abundant element, has the characteristics of wide sources, rich application scenarios, high calorific value, zero carbon emissions, and renewable energy. It is regarded as the energy with the most 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. The rapid development of the hydrogen energy industry has also made hydrogen emissions and safety issues increasingly valued by people. For example, in the most widely used on-board hydrogen fuel cells, in order to maintain the performance of the fuel cell, the anode will discharge a portion of hydrogen enriched with nitrogen and other impurities through the tail valve from time to time. This part of the tail exhaust hydrogen accounts for about 3%-5% of the total hydrogen supply of the fuel cell; for another example, in the field of liquid hydrogen, during the use and storage of liquid hydrogen storage bottles, there is inevitably a loss of liquid hydrogen vaporization, with a daily evaporation rate of 1-3%. When the vaporized hydrogen reaches a certain pressure, it needs to be discharged through a safety valve, otherwise it will cause the pressure in the bottle to increase, bringing the risk of explosion; in addition, about 3% of the by-product hydrogen of the chlor-alkali industry will be directly discharged, reaching 340 million standard cubic meters a year. These unused hydrogen are often discharged into the atmosphere in the form of direct discharge, but in some special scenarios, hydrogen cannot be discharged directly, such as small submarines with fuel cells as power systems, fuel cell mining trucks operating in semi-closed environments, fuel cell-powered vehicles driving in tunnels, fuel cell subways, etc. In these scenarios, the direct discharge of hydrogen is prone to rapid accumulation, bringing the risk of hydrogen fire and explosion. In addition, hydrogen 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 reduction in hydroxyl radicals that react with methane in the atmosphere, exacerbating the greenhouse effect.

[0003] Therefore, with the development of hydrogen energy, hydrogen safety and hydrogen environmental protection have become increasingly prominent issues. Seeking a safe and effective hydrogen treatment method is an important part of improving the hydrogen energy development industry chain. Catalytic combustion dehydrogenation technology is a mature hydrogen treatment method. It is increasingly used in the field of hydrogen treatment due to its simple structure, safety, friendliness, high efficiency and long-term use. The core of the dehydrogenation device is a reactor carrying Pd and Pt-based catalysts. By controlling the hydrogen and oxygen mixture with a certain hydrogen concentration to enter the dehydrogenation reactor, at a suitable temperature, the catalyst catalyzes the hydrogen oxidation chemical reaction and generates water, which can achieve effective hydrogen consumption and avoid high concentrations of hydrogen being directly discharged into the air. In existing catalytic combustion dehydrogenation technologies, most dehydrogenation control methods are based on the control of test benches or test devices, and rely too much on sensors, especially the more expensive hydrogen concentration sensors or oxygen concentration sensors, which are difficult to use on products with high integration and strict cost control. Summary of the invention

[0004] Based on this, it is necessary to provide a hydrogen elimination control method without obtaining hydrogen concentration. The hydrogen elimination control method without obtaining hydrogen concentration of the present invention can be applied to the field of hydrogen treatment, and the unused hydrogen is eliminated by using the mature hydrogen elimination technology route of hydrogen-oxygen catalytic combustion to eliminate and treat the unused hydrogen. By dynamically adjusting the regulating components of the hydrogen pipeline and the air pipeline, the mixed hydrogen concentration is within the safety threshold range or the target concentration range, and the hydrogen elimination temperature is monitored, the hydrogen output and air flow are multi-dimensionally regulated, and the hydrogen flow is corrected based on the reaction temperature, so as to realize multi-dimensional hydrogen elimination safety control without the need for a hydrogen concentration sensor.

[0005] An embodiment of the present application provides a hydrogen elimination control method without obtaining hydrogen concentration.

[0006] A hydrogen elimination control method without obtaining hydrogen concentration comprises the following steps:

[0007] The air control components of the air circuit are calibrated, and the air supply flow of the air control components at a certain speed and pressure ratio is calibrated to obtain MAP1 based on the "speed-pressure ratio-flow" relationship; the hydrogen control components of the hydrogen circuit are calibrated, and the air supply flow of the hydrogen control components at certain front and rear end pressures and different duty cycles is calibrated to obtain MAP2 based on the "valve front pressure-valve rear pressure-opening duty cycle-flow" relationship; under different hydrogen mixed concentrations, the actual air flow of the air circuit is detected and the target air flow corresponding to the target hydrogen mixed concentration is subtracted to obtain the air flow difference feedback, and the feedforward speed of the air control components is corrected to make the actual air The flow rate is equal to the target air flow rate, and the MAP1 correction after the speed correction of the air control component is obtained; the actual hydrogen concentration of the hydrogen path and the target mixed hydrogen concentration are detected and subtracted to obtain the hydrogen concentration difference feedback, and the feedforward duty cycle of the hydrogen control component is corrected to make the actual hydrogen concentration equal to the target mixed hydrogen concentration, and the MAP2 correction after the opening duty cycle of the hydrogen control component is corrected, and the corresponding relationship table between each different mixed hydrogen concentration and the MAP1 correction and the MAP2 correction is obtained, and they are used as the air path air control component speed lookup value and the hydrogen path hydrogen control component opening duty cycle lookup value of different mixed hydrogen concentrations in actual applications when there is no hydrogen concentration sensor;

[0008] Calibrate the reaction temperature of the mixed gas at different mixed hydrogen concentrations during the hydrogen catalytic combustion reaction to obtain the reaction temperature interval t1~t2, and formulate the relationship curve between each different mixed hydrogen concentration and the corresponding reaction temperature interval t1~t2; obtain the fitting relationship curve between the reaction temperature and the duty cycle of the hydrogen control component from the calibration data of "target hydrogen concentration-hydrogen control component duty cycle" and "target hydrogen concentration-reaction temperature";

[0009] In actual application of hydrogen removal, a preset target hydrogen concentration is set, and the mixed gas with the preset target hydrogen concentration after actual hydrogen mixing enters the hydrogen removal reactor for hydrogen catalytic combustion reaction, and the actual reaction temperature t of the hydrogen removal reactor is detected, and the reaction temperature interval t1~t2 corresponding to the preset target hydrogen concentration is obtained based on the reaction temperature interval t1~t2 relationship curve, and it is judged whether the actual mixed hydrogen concentration of the mixed gas is within the target mixed hydrogen concentration range, wherein, when t1≤t≤t2, the actual reaction temperature t is within the theoretical threshold interval, and the first correction value is obtained, and no correction is required; when t>t2, the actual reaction temperature t is too high, indicating that the hydrogen concentration in the mixed gas is too high, and the duty cycle of the hydrogen control component needs to be reduced, and by calculating the temperature deviation, △t = t- t2, based on △t and the fitting relationship curve of the reaction temperature and the duty cycle of the hydrogen control component, a second correction value of the duty cycle of the hydrogen control component is obtained, and the value is a negative value. Based on the second correction value, the duty cycle of the hydrogen control component is corrected through MAP2; when t<t1, it indicates that the hydrogen concentration in the mixed gas is low and the duty cycle of the hydrogen control component needs to be increased. By calculating the temperature deviation, △t=t1-t, based on △t and the fitting relationship curve of the reaction temperature and the duty cycle of the hydrogen proportional valve, a third correction of the duty cycle of the hydrogen control component is obtained, and the value is a positive value. Based on the third correction value, the duty cycle of the hydrogen control component is corrected through MAP2.

[0010] In some embodiments, the air control component includes an air compressor or an air supply pump.

[0011] In some embodiments, the hydrogen regulating component includes a proportional valve or a hydrogen injection valve.

[0012] In some of the embodiments, when detecting the actual air flow, an air flow sensor is arranged in the air path for detection.

[0013] In some of the embodiments, when detecting the actual hydrogen flow rate, a hydrogen concentration sensor is arranged in the gas mixing pipeline for detection.

[0014] In some embodiments, the first correction value=0.

[0015] In some of the embodiments, when detecting the actual reaction temperature t of the hydrogen removal reactor, a plurality of temperature sensors are used to detect and obtain an average value.

[0016] In some of the embodiments, a temperature sensor is used to detect the actual reaction temperature t of the hydrogen removal reactor.

[0017] In some of these embodiments, PID is used when correcting the feed-forward speed of the air control component.

[0018] In some of the embodiments, PID is used to correct the feedforward duty cycle of the hydrogen regulating component.

[0019] An embodiment of the present application also provides a hydrogen removal system.

[0020] A hydrogen removal system comprises an air path, a hydrogen path, an air control component, a hydrogen control component, a gas mixing component, a hydrogen removal reactor, a temperature sensor, an air flow sensor and a control system, wherein the air path and the hydrogen path are connected to the gas mixing component in parallel, the air control component is arranged in the air path, the hydrogen control component is arranged in the hydrogen path, the hydrogen removal reactor is connected to the gas mixing component, the temperature sensor is connected to the hydrogen removal reactor, the air flow sensor is arranged in the air path, and the control system can execute the above-mentioned hydrogen removal control method without obtaining hydrogen concentration.

[0021] The above-mentioned hydrogen elimination control method without obtaining hydrogen concentration, through preliminary data calibration, eliminates the relatively expensive hydrogen concentration sensor in the actual hydrogen elimination process, controls the hydrogen output based on the hydrogen inlet and outlet pressures and the duty cycle control of the hydrogen control component, and adjusts the air (oxygen) flow accordingly, so that the mixed hydrogen concentration is within the safety threshold range or the target concentration range; at the same time, the hydrogen elimination reactor is temperature monitored, and the hydrogen flow is corrected based on the reaction temperature, so as to achieve multi-dimensional hydrogen elimination safety control without the need for a hydrogen concentration sensor. This application only uses a hydrogen concentration sensor in the preliminary calibration stage. The hydrogen elimination system used in actual engineering does not need to rely on expensive hydrogen concentration sensors. It can dynamically adjust the hydrogen path and air path control components according to the target hydrogen elimination concentration, and correct the hydrogen output through the back-end real-time hydrogen elimination temperature, so as to achieve multi-dimensional control, achieve uniform and stable mixed hydrogen, and save the cost of the hydrogen elimination device; this hydrogen elimination control method without obtaining hydrogen concentration can be applied to batch intensive commercial hydrogen elimination devices or systems. The present application does not require the acquisition of hydrogen concentration in the hydrogen elimination control method. In the actual application stage, the hydrogen elimination control does not rely on the real-time hydrogen concentration feedback of the hydrogen concentration sensor, but controls the hydrogen path gas output and the air path gas output according to the target hydrogen concentration based on the calibration data, and adjusts and corrects the hydrogen gas output according to the hydrogen elimination reaction temperature, thereby achieving effective treatment of the discharged hydrogen, avoiding the risks of hydrogen accumulation caused by direct hydrogen emission, avoiding the impact on the atmospheric environment, and being economical, safe and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] 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.

[0024] FIG1 is a schematic diagram of some steps of a hydrogen elimination control method without obtaining hydrogen concentration according to an embodiment of the present invention;

[0025] FIG. 2 is a schematic diagram of some steps of a hydrogen elimination control method without obtaining hydrogen concentration according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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".

[0030] In this article, unless otherwise stated, each reaction step may be carried out in the order described herein or may not be carried out in the order described herein. 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 common knowledge and experience. Preferably, the reaction method herein is carried out sequentially.

[0031] 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.

[0032] The embodiment of the present application provides a hydrogen elimination control method without obtaining hydrogen concentration, so as to solve the following three shortcomings of the prior art: (1) Most hydrogen elimination control methods are based on the control of test benches or test devices, and rely too much on sensors, especially expensive hydrogen concentration sensors or oxygen concentration sensors, which are difficult to use in products with high integration and strict cost control; (2) Most of the existing hydrogen elimination methods describe the startup and operation steps of hydrogen elimination devices, and do not involve specific control strategies; (3) The mixed hydrogen control based on the target hydrogen concentration does not introduce the problem of multi-dimensional control of related quantities such as temperature. The following will illustrate the hydrogen elimination control method without obtaining hydrogen concentration in conjunction with the accompanying drawings.

[0033] The hydrogen elimination control method without obtaining hydrogen concentration provided in the embodiment of the present application is exemplarily shown in Figures 1 and 2, which are partial method schematic diagrams of the hydrogen elimination control method without obtaining hydrogen concentration provided in the embodiment of the present application. The hydrogen elimination control method without obtaining hydrogen concentration of the present application can be used for hydrogen elimination purposes.

[0034] In order to more clearly illustrate the structure of the hydrogen elimination control method without obtaining the hydrogen concentration, the hydrogen elimination control method without obtaining the hydrogen concentration will be introduced below with reference to the accompanying drawings.

[0035] Exemplarily, a hydrogen elimination control method without obtaining hydrogen concentration comprises the following steps:

[0036] (1) As shown in Figure 1, the air control components of the air circuit are calibrated, and the air supply flow of the air control components at a certain speed and pressure ratio is calibrated to obtain MAP1 based on the "speed-pressure ratio-flow" relationship; the hydrogen control components of the hydrogen circuit are calibrated, and the air supply flow of the hydrogen control components at certain front and rear end pressures and different duty cycles is calibrated to obtain MAP2 based on the "valve front pressure-valve rear pressure-opening duty cycle-flow" relationship; at different hydrogen mixed concentrations, the actual air flow of the air circuit is detected and the target air flow corresponding to the target hydrogen mixed concentration is subtracted to obtain the air flow difference feedback, and the air control component feedforward speed is corrected to obtain the air flow difference feedback. The actual air flow is made equal to the target air flow, and the MAP1 correction after the speed correction of the air control component is obtained; the actual hydrogen concentration of the hydrogen path is detected and the target mixed hydrogen concentration is subtracted to obtain the hydrogen concentration difference feedback, and the feedforward duty cycle of the hydrogen control component is corrected to make the actual hydrogen concentration equal to the target mixed hydrogen concentration, and the MAP2 correction after the opening duty cycle of the hydrogen control component is corrected, and the corresponding relationship table between each different mixed hydrogen concentration and the MAP1 correction and the MAP2 correction is obtained, and they are used as the air path air control component speed lookup value and the hydrogen path hydrogen control component opening duty cycle lookup value of different mixed hydrogen concentrations in actual applications when there is no hydrogen concentration sensor;

[0037] (2) Calibrate the reaction temperature of the mixed gas at different mixed hydrogen concentrations during the hydrogen catalytic combustion reaction to obtain the reaction temperature range t1~t2, and develop the relationship curve between each different mixed hydrogen concentration and the corresponding reaction temperature range t1~t2; obtain the fitting relationship curve between the reaction temperature and the duty cycle of the hydrogen control component based on the calibration data of "target hydrogen concentration-hydrogen control component duty cycle" and "target hydrogen concentration-reaction temperature".

[0038] In the relationship curve between the mixed hydrogen concentration and the corresponding reaction temperature interval t1~t2, as the hydrogen concentration in the mixed gas increases, the reaction temperature increases, thereby obtaining the relationship between the mixed hydrogen concentration and the hydrogen catalytic combustion reaction temperature. The reaction temperature is positively correlated with the mixed hydrogen concentration, and the mixed hydrogen concentration is positively correlated with the duty cycle of the hydrogen control component of the hydrogen path, such as the opening duty cycle of the hydrogen proportional valve. Therefore, the fitting relationship curve between the reaction temperature and the duty cycle of the hydrogen control component can be obtained from the calibration data of "target hydrogen concentration-hydrogen control component duty cycle" and "target hydrogen concentration-reaction temperature".

[0039] (3) Please refer to FIG. 2. When hydrogen removal is actually applied, a preset target hydrogen concentration is set. The mixed gas with the preset target hydrogen concentration after actual hydrogen mixing enters the hydrogen removal reactor for hydrogen catalytic combustion reaction. The actual reaction temperature t of the hydrogen removal reactor is detected, and the reaction temperature interval t1~t2 corresponding to the preset target hydrogen concentration is obtained based on the reaction temperature interval t1~t2 relationship curve. It is judged whether the actual mixed hydrogen concentration of the mixed gas is within the target mixed hydrogen concentration range. When t1≤t≤t2, the actual reaction temperature t is within the theoretical threshold interval, and the first correction value is obtained without correction. When t>t2, the actual reaction temperature t is too high, indicating that the hydrogen concentration in the mixed gas is too high, and the duty cycle of the hydrogen control component needs to be reduced. By calculating the temperature deviation, △t = t- t2, based on △t and the fitting relationship curve of the reaction temperature and the duty cycle of the hydrogen control component, a second correction value of the duty cycle of the hydrogen control component is obtained, and the value is a negative value. Based on the second correction value, the duty cycle of the hydrogen control component is corrected through MAP2; when t<t1, it indicates that the hydrogen concentration in the mixed gas is low and the duty cycle of the hydrogen control component needs to be increased. By calculating the temperature deviation, △t=t1-t, based on △t and the fitting relationship curve of the reaction temperature and the duty cycle of the hydrogen proportional valve, a third correction of the duty cycle of the hydrogen control component is obtained, and the value is a positive value. Based on the third correction value, the duty cycle of the hydrogen control component is corrected through MAP2.

[0040] It should be noted that the second correction value and the third correction value are not fixed values, but point-to-point table lookup values ​​obtained based on calibration data. Based on the fitting relationship curve between the reaction temperature and the duty cycle of the hydrogen control component, the correction values ​​corresponding to different △t can be calculated. The above-mentioned corresponding relationship table between different mixed hydrogen concentrations and MAP1 correction and MAP2 correction includes multiple known mixed hydrogen concentrations, and each known mixed hydrogen concentration corresponds to a set of MAP1 correction and MAP2 correction parameters. In the relationship curve between the hydrogen mixture concentration and the corresponding reaction temperature interval t1~t2, the known hydrogen mixture concentrations correspond to different reaction temperature intervals t1~t2 respectively. Therefore, when the mixed gas after actual hydrogen mixture enters the hydrogen removal reactor for hydrogen catalytic combustion, the actual reaction temperature t is measured and compared with the reaction temperature interval t1~t2, so as to know whether the actual hydrogen mixture concentration deviates from the preset target hydrogen concentration. If there is a deviation, the duty cycle of the hydrogen control component is corrected through MAP2 based on the second correction value, or the duty cycle of the hydrogen control component is corrected through MAP2 based on the third correction value, so that the actual hydrogen mixture concentration can basically be close to the preset target hydrogen concentration. It can be seen that in the present application, in addition to the need to use a hydrogen concentration sensor in the early calibration stage to obtain a corresponding relationship table between different mixed hydrogen concentrations and MAP1 correction, MAP2 correction, the corresponding relationship table between different mixed hydrogen concentrations and MAP1 correction, MAP2 correction can be used as a standard reference table. Therefore, in subsequent practical applications, there is no need to perform early calibration, and only the actual reaction temperature t of the mixed gas with a preset target hydrogen concentration in the hydrogen removal reactor needs to be measured. That is, in practical applications, there is no need to set a hydrogen concentration sensor, and when controlling hydrogen removal, only step (3) needs to be performed.

[0041] For example, assuming that the hydrogen ratio valve duty ratio of the mixture with a target hydrogen concentration of 1% is 0.45 after MAP2 correction, and the corresponding hydrogen catalytic combustion temperature is 453K-473K, and the hydrogen ratio valve duty ratio of the mixture with a target hydrogen concentration of 1.5% is 0.55 after MAP2 correction, and the corresponding hydrogen catalytic combustion temperature is 503K-523K, then when the target hydrogen concentration is in the range of 1%-1.5%, the relationship between the hydrogen ratio valve duty ratio r and the hydrogen catalytic combustion temperature t is, r=0.002t-0.476, and the hydrogen ratio valve duty ratio correction value △r =0.002△t. At the target hydrogen depletion concentration of 1%, if the hydrogen catalytic combustion temperature reaches 493K and the temperature exceeds the maximum threshold of 20K, it is necessary to reduce the concentration of hydrogen in the mixed gas by reducing the duty cycle of the hydrogen proportional valve. △r=0.002×(473-493)=-0.04. The corrected duty cycle of the hydrogen proportional valve is 0.45+(-0.04)=0.41. By reducing the duty cycle of the hydrogen proportional valve in the hydrogen path and reducing the flow rate of hydrogen, the hydrogen catalytic reaction temperature returns to the normal threshold range, and then the hydrogen concentration of the mixed gas is controlled at the target hydrogen concentration.

[0042] In the present application, the hydrogen flow rate is corrected based on the actual reaction temperature of the hydrogen catalytic combustion reaction in the hydrogen removal reactor, so as to realize multi-dimensional hydrogen removal control without the need for a hydrogen concentration sensor. The following description is based on the air control component being an air compressor and the hydrogen control component being a proportional valve.

[0043] Air (oxygen) flow regulation means that the air compressor has a certain gas output at a certain speed and pressure ratio, and can also be calibrated to form a multi-dimensional MAP1, that is, the "speed-pressure ratio-flow" data table MAP1. Based on the inlet and outlet pressures of the hydrogen path and the pulse width control of the hydrogen outlet proportional valve, it means that the proportional valve opens a certain proportional valve duty cycle under certain front and rear end pressures, and its gas output is certain. It can be calibrated to form a multi-dimensional MAP2, that is, the "valve front pressure-valve rear pressure-opening duty cycle-flow" data table MAP2. At the same time, the oxygen flow rate can be converted from the air flow rate by multiplying the coefficient 0.21 (the proportion of oxygen content in the air) according to demand. Based on the hydrogen concentration of the target mixed gas, the amount of hydrogen and air (oxygen) in the mixed gas can be theoretically calculated, and the corresponding duty cycle of the proportional valve and the speed of the air compressor can be obtained. That is, according to the hydrogen concentration c = V H2 / V 混 , and V 混 = V H2 +V Air , then V H2 = (c / 1-c ) V Air Assume that at a certain moment, the volume of air coming out of the air compressor is V Air is V1, the target hydrogen concentration is c1, then V H2= (c1 / 1- c1) V1, V1 can be regarded as the instantaneous air flow at a certain moment. From V1 and the current pressure ratio, the speed of the air compressor can be obtained, and the required hydrogen volume V can also be obtained. H2 ; by V H2 The duty ratio of the proportional valve can be obtained by the pressures at the front and rear ends of the proportional valve at the current moment, thereby achieving a mixed gas with a target hydrogen concentration.

[0044] In the present application, based on the initial calibration of the reaction temperature of the mixed gas at each different mixed hydrogen concentration during the hydrogen catalytic combustion reaction, the reaction temperature interval t1~t2 is obtained, and the relationship curve between each different mixed hydrogen concentration and the corresponding reaction temperature interval t1~t2 is formulated. The correction of the reaction temperature to the hydrogen flow rate refers to the use of a temperature sensor for calibration, the use of a precious metal catalyst in the hydrogen removal reactor to catalyze the combustion of hydrogen in the mixed gas to generate heat, and the temperature change is monitored by a temperature sensor to determine the actual mixed hydrogen concentration, and to compare whether the actual mixed hydrogen concentration is deviated from the preset target hydrogen concentration. If there is a deviation, regulation is performed. Generally, for every 0.1% increase in the hydrogen concentration in the mixed gas, the reaction temperature will increase by 9.71K when burning in the hydrogen removal reactor, and the temperature of the hydrogen catalytic combustion in the hydrogen removal reactor is generally lower than 800K. Therefore, based on the actual reaction temperature t of the hydrogen removal reactor, the hydrogen concentration in the mixed gas can be corrected.

[0045] In some embodiments, the air control component includes an air compressor or an air supply pump.

[0046] In some embodiments, the hydrogen regulating component includes a proportional valve or a hydrogen injection valve.

[0047] In some of the embodiments, when detecting the actual air flow, an air flow sensor is arranged in the air path for detection.

[0048] In some of the embodiments, when detecting the actual hydrogen flow rate, a hydrogen concentration sensor is arranged in the gas mixing pipeline for detection.

[0049] In some of these embodiments, the first correction value=0.

[0050] In some embodiments, t2 in the reaction temperature interval is not greater than 800K.

[0051] In some of the embodiments, a temperature sensor is used to detect the actual reaction temperature t of the hydrogen removal reactor.

[0052] In some of the embodiments, when detecting the actual reaction temperature t of the hydrogen removal reactor, a plurality of temperature sensors are used to detect and obtain an average value.

[0053] In some of these embodiments, PID is used when correcting the feed-forward speed of the air control component.

[0054] In some of the embodiments, PID is used to correct the feedforward duty cycle of the hydrogen regulating component.

[0055] It should be noted that the second correction value and the third correction value are not fixed values, but point-to-point table lookup values ​​obtained according to the calibration data. The detection value of the reaction temperature of the mixed gas can be the average of multiple temperature sensors, which improves the accuracy of the judgment and prevents misjudgment. Therefore, based on the calibration of the air control components and hydrogen control components of the air and hydrogen circuits in the early stage, the air control components such as the air compressor speed are regulated by the MAP1 corrected by "feedforward + feedback" to obtain the air flow under different mixed hydrogen concentration requirements. The MAP2 corrected by "feedforward + feedback" and the hydrogen control components such as the proportional valve duty cycle are regulated by combining temperature correction to obtain different hydrogen flow rates, so that the concentration of the mixed gas after hydrogen mixing reaches the target hydrogen concentration, and hydrogen elimination control is achieved without obtaining the hydrogen concentration.

[0056] An embodiment of the present application also provides a hydrogen removal system.

[0057] A hydrogen removal system comprises an air path, a hydrogen path, an air control component, a hydrogen control component, a gas mixing component, a hydrogen removal reactor, a temperature sensor, an air flow sensor and a control system, wherein the air path and the hydrogen path are connected to the gas mixing component in parallel, the air control component is arranged on the air path, the hydrogen control component is arranged on the hydrogen path, the hydrogen removal reactor is connected to the gas mixing component, the temperature sensor is connected to the hydrogen removal reactor, the air flow sensor is arranged on the air path, and the control system can execute the above-mentioned hydrogen removal control method without obtaining the hydrogen concentration.

[0058] The above-mentioned hydrogen elimination control method without obtaining hydrogen concentration, through preliminary data calibration, eliminates the relatively expensive hydrogen concentration sensor in the actual hydrogen elimination process, controls the hydrogen output based on the hydrogen inlet and outlet pressures and the duty cycle control of the hydrogen control component, and adjusts the air (oxygen) flow accordingly, so that the mixed hydrogen concentration is within the safety threshold range or the target concentration range; at the same time, the hydrogen elimination reactor is temperature monitored, and the hydrogen flow is corrected based on the reaction temperature, so as to achieve multi-dimensional hydrogen elimination safety control without the need for a hydrogen concentration sensor. This application only uses a hydrogen concentration sensor in the preliminary calibration stage. The hydrogen elimination system used in actual engineering does not need to rely on expensive hydrogen concentration sensors. It can dynamically adjust the hydrogen path and air path control components according to the target hydrogen elimination concentration, and correct the hydrogen output through the back-end real-time hydrogen elimination temperature, so as to achieve multi-dimensional control, achieve uniform and stable mixed hydrogen, and save the cost of the hydrogen elimination device; this hydrogen elimination control method without obtaining hydrogen concentration can be applied to batch intensive commercial hydrogen elimination devices or systems. The present application does not require the acquisition of hydrogen concentration in the hydrogen elimination control method. In the actual application stage, the hydrogen elimination control does not rely on the real-time hydrogen concentration feedback of the hydrogen concentration sensor, but controls the hydrogen path gas output and the air path gas output according to the target hydrogen concentration based on the calibration data, and adjusts and corrects the hydrogen gas output according to the hydrogen elimination reaction temperature, thereby achieving effective treatment of the discharged hydrogen, avoiding the risks of hydrogen accumulation caused by direct hydrogen emission, avoiding the impact on the atmospheric environment, and being economical, safe and environmentally friendly.

[0059] 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.

[0060] 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.

[0061] 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 hydrogen elimination control method without obtaining hydrogen concentration, characterized in that: The steps include: The air control components of the air circuit are calibrated, and the air supply flow of the air control components at a certain speed and pressure ratio is calibrated to obtain MAP1 based on the "speed-pressure ratio-flow" relationship; the hydrogen control components of the hydrogen circuit are calibrated, and the air supply flow of the hydrogen control components at certain front and rear end pressures and different duty ratios is calibrated to obtain MAP2 based on the "valve front pressure-valve rear pressure-opening duty ratio-flow" relationship; under different mixed hydrogen concentrations, the actual air flow of the air circuit is detected and the target air flow corresponding to the target mixed hydrogen concentration is subtracted to obtain air flow difference feedback, the feedforward speed of the air control component is corrected to make the actual air flow equal to the target air flow, and the MAP1 after the speed of the air control component is corrected is obtained; The actual hydrogen concentration of the hydrogen path is detected and the target mixed hydrogen concentration is subtracted to obtain hydrogen concentration difference feedback, and the feedforward duty cycle of the hydrogen control component is corrected so that the actual hydrogen concentration is equal to the target mixed hydrogen concentration, and the MAP2 correction after the correction of the opening duty cycle of the hydrogen control component is obtained, and the corresponding relationship table between each different mixed hydrogen concentration and the MAP1 correction and the MAP2 correction is obtained, and used as the air path air control component speed lookup value and the hydrogen path hydrogen control component opening duty cycle lookup value of different mixed hydrogen concentrations in actual applications when there is no hydrogen concentration sensor; The reaction temperature of the mixed gas at different mixed hydrogen concentrations during the hydrogen catalytic combustion reaction is calibrated to obtain the reaction temperature interval t1~t2, and the relationship curve between each different mixed hydrogen concentration and the corresponding reaction temperature interval t1~t2 is formulated; the fitting relationship curve between the reaction temperature and the duty cycle of the hydrogen control component is obtained from the calibration data of "target hydrogen concentration-hydrogen control component duty cycle" and "target hydrogen concentration-reaction temperature"; When hydrogen removal is actually applied, a preset target hydrogen concentration is set, and the mixed gas with the preset target hydrogen concentration after actual hydrogen mixing enters the hydrogen removal reactor for hydrogen catalytic combustion reaction, and the actual reaction temperature t of the hydrogen removal reactor is detected, and the reaction temperature interval t1~t2 corresponding to the preset target hydrogen concentration is obtained based on the reaction temperature interval t1~t2 relationship curve, and it is judged whether the actual mixed hydrogen concentration of the mixed gas is within the target mixed hydrogen concentration range, wherein, when t1≤t≤t2, the actual reaction temperature t is within the theoretical threshold interval, and a first correction value is obtained, and no correction is required; when t>t2, the actual reaction temperature t is too high, indicating that the hydrogen concentration in the mixed gas is too high, and the duty cycle of the hydrogen control component needs to be reduced, and the temperature deviation is calculated, △t=t-t2, and the second correction value of the duty cycle of the hydrogen control component is obtained based on △t and the fitting relationship curve of the reaction temperature and the duty cycle of the hydrogen control component, which value is a negative value, and the duty cycle of the hydrogen control component is corrected through MAP2 based on the second correction value; When t<t1, it indicates that the hydrogen concentration in the mixed gas is low and the duty cycle of the hydrogen control component needs to be increased. By calculating the temperature deviation, △t=t1-t, the third correction of the duty cycle of the hydrogen control component is obtained based on the fitting relationship curve of △t, reaction temperature and hydrogen proportional valve duty cycle. This value is positive. Based on the third correction value, the duty cycle of the hydrogen control component is corrected through MAP2.

2. The hydrogen elimination control method without obtaining hydrogen concentration according to claim 1, characterized in that: The air control component includes an air compressor or an air supply pump.

3. The hydrogen elimination control method without obtaining hydrogen concentration according to claim 1, characterized in that: The hydrogen regulating component includes a proportional valve or a hydrogen injection valve.

4. The hydrogen elimination control method without obtaining hydrogen concentration according to claim 1, characterized in that: When detecting the actual air flow, an air flow sensor is set in the air path for detection.

5. The hydrogen elimination control method without obtaining hydrogen concentration according to claim 1, characterized in that: When detecting the actual hydrogen flow rate, a hydrogen concentration sensor is set in the mixed gas pipeline for detection.

6. The hydrogen elimination control method without obtaining hydrogen concentration according to claim 1, characterized in that: The first correction value=0.

7. The hydrogen elimination control method without obtaining hydrogen concentration according to any one of claims 1 to 6, characterized in that: A temperature sensor is used to detect the actual reaction temperature t of the hydrogen removal reactor.

8. The hydrogen elimination control method without obtaining hydrogen concentration according to any one of claims 1 to 6, characterized in that: When detecting the actual reaction temperature t of the hydrogen removal reactor, a plurality of temperature sensors are used to detect and obtain an average value.

9. The hydrogen elimination control method without obtaining hydrogen concentration according to any one of claims 1 to 6, characterized in that: PID is used when correcting the feed-forward speed of air control components; And / or, using PID when correcting the feedforward duty cycle of the hydrogen control component.

10. A hydrogen removal system, characterized in that: The invention comprises an air path, a hydrogen path, an air control component, a hydrogen control component, a gas mixing component, a hydrogen removal reactor, a temperature sensor, an air flow sensor and a control system, wherein the air path and the hydrogen path are connected to the gas mixing component in parallel, the air control component is arranged in the air path, the hydrogen control component is arranged in the hydrogen path, the hydrogen removal reactor is connected to the gas mixing component, the temperature sensor is connected to the hydrogen removal reactor, the air flow sensor is arranged in the air path, and the control system can execute the hydrogen removal control method without obtaining the hydrogen concentration as claimed in any one of claims 1 to 9.

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