Hydrogen concentration acquisition-free hydrogen elimination control method and hydrogen elimination system

Abstract

The application discloses a hydrogen elimination control method and system without obtaining hydrogen concentration. The hydrogen elimination control method without obtaining hydrogen concentration cancels the hydrogen concentration sensor with high price in the actual hydrogen elimination process through early data calibration, controls the hydrogen outlet flow based on the hydrogen inlet and outlet gas pressures and the opening duty cycle control of the hydrogen regulation component, and adjusts the air (oxygen) flow correspondingly, so that the hydrogen mixing concentration is in the safety threshold range or the target concentration range. Meanwhile, the temperature of the hydrogen elimination reactor is monitored, the hydrogen flow is corrected based on the reaction temperature, and the multi-dimensional hydrogen elimination safety control without the hydrogen concentration sensor is realized.

Description

TECHNICAL FIELD

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

[0002] With the increasingly prominent global energy shortage and environmental problems, the development and utilization of low-carbon, clean and renewable energy are imminent. Hydrogen energy, as the most abundant element, has the characteristics of wide source, rich application scenarios, high heat value, zero carbon emission and renewable, and is regarded as the most potential energy in the 21st century. At present, hydrogen energy has been widely used in transportation, industry, electronics and construction fields. At the same time, hydrogen energy can also be used as energy reserves to solve the energy crisis. The rapid development of hydrogen energy industry also makes people pay more and more attention to hydrogen emission and safety problems. For example, the most widely used vehicle-mounted hydrogen fuel cell, in order to maintain the performance of the fuel cell, the anode will discharge a part of hydrogen gas enriched with nitrogen and other impurities through the tail valve at irregular intervals. This part of the tail hydrogen accounts for about 3%-5% of the total supply of hydrogen fuel cell. For another example, in the field of liquid hydrogen, liquid hydrogen storage cylinders inevitably have liquid hydrogen vaporization loss during use and storage, 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 rise and bring the risk of explosion. In addition, about 3% of the by-product hydrogen in the chlor-alkali industry will be directly discharged, reaching 340 million cubic meters per year. These unused hydrogen is often discharged into the atmosphere in the form of direct discharge, but in some special scenarios, hydrogen cannot be directly discharged, such as small submarines with fuel cells as power systems, fuel cell mining trucks in semi-closed environments, fuel cell-powered vehicles driving in tunnels, fuel cell subways, etc. In these scenarios, direct discharge of hydrogen can easily cause rapid accumulation, posing a risk of hydrogen fire and explosion. In addition, hydrogen can also react with ozone in the stratosphere, damaging the ozone layer, and hydrogen can also react with hydroxyl radicals in the air, reducing the hydroxyl radicals that react with methane in the atmosphere, and intensifying the greenhouse effect.

[0003] Therefore, with the development of hydrogen energy, hydrogen safety and hydrogen environmental protection have become increasingly prominent issues, and seeking a safe and effective hydrogen treatment method is an important part of perfecting the hydrogen energy development industry chain. The catalytic combustion type hydrogen elimination technology is a mature hydrogen treatment method, which is more and more used in the field of hydrogen treatment due to its simple structure, safety, friendliness, high efficiency and long duration. The core of the hydrogen elimination device is a reactor carrying a Pd and Pt-based catalyst. By controlling the hydrogen-oxygen mixed gas with a certain hydrogen concentration into the hydrogen elimination reactor, the catalyst catalyzes the hydrogen-oxygen chemical reaction and generates water at a suitable temperature, which can realize effective elimination and treatment of hydrogen, and avoid direct discharge of high-concentration hydrogen into the air. In the existing catalytic combustion type hydrogen elimination technology, most of the hydrogen elimination control methods are based on the control of test benches or test devices, which rely too much on sensors, especially high-priced hydrogen concentration sensors or oxygen concentration sensors, and are difficult to be used in products with high integration and strict cost control. SUMMARY

[0004] Therefore, it is necessary to provide a hydrogen elimination control method without obtaining hydrogen concentration. The hydrogen elimination control method without obtaining hydrogen concentration can be applied to the field of hydrogen treatment, uses the mature hydrogen elimination technology of hydrogen-oxygen catalytic combustion to eliminate and treat unused hydrogen, dynamically regulates the regulating components of the hydrogen pipeline and the air pipeline to make the hydrogen mixing concentration within the safe threshold range or the target concentration range, monitors the hydrogen elimination temperature, multi-dimensionally regulates the hydrogen outlet amount and the air flow, corrects the hydrogen flow based on the reaction temperature, and realizes multi-dimensional hydrogen elimination safety control without 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 regulating component of the air path is calibrated, the air flow of the air regulating component under certain rotating speed and pressure ratio is calibrated, and a MAP1 based on the "rotating speed-pressure ratio-flow" relationship is obtained; the hydrogen regulating component of the hydrogen path is calibrated, the air flow of the hydrogen regulating component under certain front and rear end pressure and different duty cycles is calibrated, and a MAP2 based on the "valve front pressure-valve rear pressure-opening duty cycle-flow" relationship is obtained; under each different hydrogen mixing concentration, the actual air flow of the air path and the target air flow corresponding to the target hydrogen mixing concentration are detected and the difference is obtained to obtain an air flow difference feedback, the air regulating component feedforward rotating speed is corrected to make the actual air flow equal to the target air flow, and a MAP1 modified after rotating speed correction of the air regulating component is obtained; the actual hydrogen concentration of the hydrogen path and the target hydrogen mixing concentration are detected and the difference is obtained to obtain a hydrogen concentration difference feedback, the hydrogen regulating component feedforward duty cycle is corrected to make the actual hydrogen concentration equal to the target hydrogen mixing concentration, and a MAP2 modified after opening duty cycle correction of the hydrogen regulating component is obtained, the corresponding relationship table between each different hydrogen mixing concentration and the MAP1 modified and the MAP2 modified is obtained, and is respectively used as the air regulating component rotating speed lookup value of the air path and the hydrogen regulating component opening duty cycle lookup value of the hydrogen path under different hydrogen mixing concentrations without hydrogen concentration sensor in actual application.

[0008] The reaction temperature of the mixed gas under each different hydrogen mixing concentration when the hydrogen catalytic combustion reaction is carried out is calibrated to obtain the reaction temperature interval t1-t2, and the relationship curve of each different hydrogen mixing concentration and the corresponding reaction temperature interval t1-t2 is formulated; the fitting relationship curve of the reaction temperature and the hydrogen regulating component duty cycle from the "target hydrogen concentration-hydrogen regulating component duty cycle" and "target hydrogen concentration-reaction temperature" calibration data is obtained.

[0009] In actual application of hydrogen elimination, a preset target hydrogen concentration is set, the mixed gas after actual hydrogen mixing with the preset target hydrogen concentration enters the hydrogen elimination reactor for hydrogen catalytic combustion reaction, the actual reaction temperature t of the hydrogen elimination 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, to determine whether the actual hydrogen mixing concentration of the mixed gas is in the target hydrogen mixing concentration range, wherein when t1≤t≤t2, the actual reaction temperature t is in the theoretical threshold interval, to obtain a first correction value, 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 regulating component needs to be reduced, the temperature deviation Δt=t-t2 is calculated, and the second correction value of the duty cycle of the hydrogen regulating component is obtained based on Δt and the fitting relationship curve of the reaction temperature and the duty cycle of the hydrogen regulating component, which is a negative value, and the duty cycle of the hydrogen regulating component is corrected based on the second correction value through MAP2 correction; when t

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

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

[0012] In some embodiments, when detecting the actual air flow, an air flow sensor is arranged on the air path to detect the actual air flow.

[0013] In some embodiments, when detecting the actual hydrogen flow, a hydrogen concentration sensor is arranged on the mixed gas pipeline to detect the actual hydrogen flow.

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

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

[0016] In some embodiments, when detecting the actual reaction temperature t of the hydrogen elimination reactor, a temperature sensor is used.

[0017] In some embodiments, PID is used to correct the air regulating component feedforward speed.

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

[0019] The embodiment of the present application also provides a hydrogen elimination system.

[0020] The hydrogen elimination system comprises an air path, a hydrogen path, an air regulating component, a hydrogen regulating component, a gas mixing component, a hydrogen elimination reactor, a temperature sensor, an air flow sensor and a control system, the air path and the hydrogen path are connected in parallel to the gas mixing component, the air regulating component is arranged on the air path, the hydrogen regulating component is arranged on the hydrogen path, the hydrogen elimination reactor is connected to the gas mixing component, the temperature sensor is connected to the hydrogen elimination reactor, the air flow sensor is arranged on the air path, and the control system can execute the hydrogen elimination control method without obtaining the hydrogen concentration.

[0021] The hydrogen elimination control method without obtaining the hydrogen concentration can cancel the high-priced hydrogen concentration sensor in the actual hydrogen elimination process through early data calibration, control the hydrogen outlet flow based on the hydrogen path inlet and outlet pressure and the hydrogen regulating component opening duty cycle control, and adjust the air (oxygen) flow accordingly, so that the hydrogen mixing concentration is within the safety threshold range or the target concentration range; meanwhile, the temperature of the hydrogen elimination reactor is monitored, the hydrogen flow is corrected based on the reaction temperature, and the multi-dimensional hydrogen elimination safety control without the hydrogen concentration sensor is realized. The present application only uses the hydrogen concentration sensor in the early calibration stage, and the hydrogen elimination system applied in the actual engineering does not need to rely on the expensive hydrogen concentration sensor, can dynamically adjust the hydrogen path and the air path regulating component according to the target hydrogen elimination concentration, and corrects the hydrogen outlet flow through the real-time hydrogen elimination temperature at the back end, realizes multi-dimensional control, realizes the uniformity and stability of the hydrogen mixing, saves the cost of the hydrogen elimination device; the hydrogen elimination control method without obtaining the hydrogen concentration can be applied to batch intensive commercial hydrogen elimination devices or systems. The hydrogen elimination control method without obtaining the hydrogen concentration of the present application does not rely on the real-time hydrogen concentration feedback of the hydrogen concentration sensor in the actual application stage, but controls the hydrogen path outlet flow and the air path outlet flow based on the calibration data according to the target hydrogen concentration, and adjusts and corrects the hydrogen outlet flow according to the hydrogen elimination reaction temperature, realizes the effective treatment of the discharged hydrogen, avoids the risks such as hydrogen accumulation caused by direct discharge of hydrogen, and avoids the influence on the atmospheric environment, which has the advantages of economy, safety and environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0023] For a more complete understanding of the present application and the advantages thereof, reference is now made to the following description taken in connection with the accompanying drawings in which like reference numerals represent like parts throughout the several figures.

[0024] Figure 1 Partial step schematic diagram of the hydrogen elimination control method without obtaining hydrogen concentration for an embodiment of the present application;

[0025] Figure 2 Partial step schematic diagram of the hydrogen elimination control method without obtaining hydrogen concentration for an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art, that the present application can be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order to avoid obscuring the present application. It will be apparent to one skilled in the art that the present application can be practiced without some or all of these specific details.

[0027] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature relative to the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature relative to the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0029] In this paper, "optionally", "optional", "optional" means optional, that is, selected from any one of the two parallel schemes of "yes" or "no". If there are multiple "optional" in a technical solution, unless otherwise specified, and there is no contradiction or mutual restriction relationship, each "optional" is independent of each other. In this application, "optionally contains", "optionally contains" and the like are described as "contains or does not contain".

[0030] In the present text, unless otherwise indicated, the individual reaction steps can be carried out in the order as given herein or not in the order as given herein. For example, the individual reaction steps can be interspersed with other steps and the order of the reaction steps can be suitably interchanged. This can be determined by the skilled person on the basis of his general knowledge and experience. Preferably, the reaction process as outlined herein is carried out sequentially.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, integers, steps, processes, acts, elements or components but do not preclude the presence or addition of one or more other features, integers, steps, processes, acts, elements, components or groups thereof.

[0032] The embodiments of the present application provide a hydrogen elimination control method without obtaining hydrogen concentration, to solve the following three problems of the prior art: (1) Most hydrogen elimination control methods are based on the control of test benches or test devices, and excessively rely on sensors, especially hydrogen concentration sensors or oxygen concentration sensors with high prices, which are difficult to use in products with high integration and strict cost control; (2) The existing hydrogen elimination methods mostly describe the starting and running steps of the hydrogen elimination device, without involving specific control strategies; (3) The hydrogen mixing control based on the target hydrogen concentration does not introduce multi-dimensional control of related quantities such as temperature. The hydrogen elimination control method without obtaining hydrogen concentration will be described below in combination with the drawings.

[0033] The hydrogen elimination control method without obtaining hydrogen concentration provided by the embodiments of the present application is exemplarily shown in Figure 1 、 2 , Figure 1 、 2 which is a part method schematic diagram of the hydrogen elimination control method without obtaining hydrogen concentration provided by the embodiments of the present application. The hydrogen elimination control method without obtaining hydrogen concentration provided by 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 hydrogen concentration, the hydrogen elimination control method without obtaining hydrogen concentration will be introduced below in combination with the drawings.

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

[0036] (1) Please refer to Figure 1The air regulating component of the air path is calibrated, the air flow rate of the air regulating component under certain rotating speed and pressure ratio is calibrated, and a MAP1 based on the "rotating speed-pressure ratio-flow rate" relationship is obtained; the hydrogen regulating component of the hydrogen path is calibrated, the air flow rate of the hydrogen regulating component under certain front and rear end pressure and different duty cycles is calibrated, and a MAP2 based on the "valve front pressure-valve rear pressure-opening duty cycle-flow rate" relationship is obtained; under each different hydrogen mixing concentration, the actual air flow rate of the air path is detected, the target air flow rate corresponding to the target hydrogen mixing concentration is obtained, and the air flow rate difference feedback is obtained by subtracting the actual air flow rate from the target air flow rate, the air regulating component feedforward rotating speed is corrected so that the actual air flow rate is equal to the target air flow rate, and the MAP1 of the air regulating component after rotating speed correction is obtained; the actual hydrogen concentration of the hydrogen path is detected, the target hydrogen mixing concentration is obtained, and the hydrogen concentration difference feedback is obtained by subtracting the actual hydrogen concentration from the target hydrogen mixing concentration, the hydrogen regulating component feedforward duty cycle is corrected so that the actual hydrogen concentration is equal to the target hydrogen mixing concentration, and the MAP2 of the hydrogen regulating component after opening duty cycle correction is obtained, and the corresponding relationship table between each different hydrogen mixing concentration and the MAP1 and the MAP2 is obtained and is used as the air regulating component rotating speed lookup table value and the hydrogen regulating component opening duty cycle lookup table value of the air path under different hydrogen mixing concentrations without hydrogen concentration sensor in actual application.

[0037] (2) The reaction temperature of the mixed gas under each different hydrogen mixing concentration when the hydrogen catalytic combustion reaction is carried out is calibrated to obtain the reaction temperature interval t1-t2, and the relationship curve of each different hydrogen mixing concentration and the corresponding reaction temperature interval t1-t2 is formulated; the fitting relationship curve of the reaction temperature and the hydrogen regulating component duty cycle is obtained from the "target hydrogen concentration-hydrogen regulating component duty cycle" and "target hydrogen concentration-reaction temperature" calibration data.

[0038] In the hydrogen mixing concentration and the corresponding reaction temperature interval t1-t2 relationship curve, as the hydrogen concentration in the mixed gas increases, the reaction temperature increases, so that the relationship between the hydrogen mixing concentration and the hydrogen catalytic combustion reaction temperature is obtained. The reaction temperature and the hydrogen mixing concentration are positively correlated, the hydrogen mixing concentration and the hydrogen regulating component duty cycle such as the opening duty cycle of the hydrogen proportioning valve are positively correlated, and therefore the fitting relationship curve of the reaction temperature and the hydrogen regulating component duty cycle can be obtained from the "target hydrogen concentration-hydrogen regulating component duty cycle" and "target hydrogen concentration-reaction temperature" calibration data.

[0039] (3) Please refer to Figure 2As shown, in the actual application of hydrogen consumption, the preset target hydrogen concentration is set, the mixed gas after the actual hydrogen mixing enters the hydrogen consumption reactor to carry out hydrogen catalytic combustion reaction, the actual reaction temperature t of the hydrogen consumption 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, whether the actual hydrogen mixing concentration of the mixed gas is in the target hydrogen mixing concentration range is judged, wherein when t1≤t≤t2, the actual reaction temperature t is in the theoretical threshold interval, the first correction value is obtained, and no correction is needed; when t>t2, the actual reaction temperature t is too high, indicating that the hydrogen concentration in the mixed gas is too high, the duty cycle of the hydrogen regulating component needs to be reduced, the temperature deviation At=t-t2 is calculated, the second correction value of the duty cycle of the hydrogen regulating component is obtained based on At and the fitting relationship curve of the reaction temperature and the duty cycle of the hydrogen regulating component, the value is negative, and the duty cycle of the hydrogen regulating component is corrected based on the second correction value through MAP2; when t

[0040] It should be noted that the second correction value and the third correction value are not fixed values, but point-to-point lookup table values obtained according to calibration data. Based on the fitting relationship curve of the reaction temperature and the duty cycle of the hydrogen regulating component, the correction value corresponding to different Δt can be calculated. The above-mentioned corresponding relationship table between each different hydrogen mixing concentration and MAP1 correction, MAP2 correction includes a plurality of known hydrogen mixing concentrations, and each known hydrogen mixing concentration corresponds to a group of MAP1 correction, MAP2 correction parameters. In the hydrogen mixing concentration and the corresponding reaction temperature interval t1-t2 relationship curve, the known hydrogen mixing concentration corresponds to different reaction temperature intervals t1-t2, therefore, based on the actual mixed gas after hydrogen mixing entering the hydrogen consumption reactor for hydrogen catalytic combustion, the actual reaction temperature t is measured and compared with the reaction temperature interval t1-t2, that is, whether the actual hydrogen mixing concentration deviates from the preset target hydrogen concentration can be known, if there is deviation, the duty cycle of the hydrogen regulating component is corrected by MAP2 correction based on the second correction value, or the duty cycle of the hydrogen regulating component is corrected by MAP2 correction based on the third correction value, which can basically realize that the actual hydrogen mixing concentration approaches the preset target hydrogen concentration. It can be seen that, in the present application, in addition to the early calibration stage, a hydrogen concentration sensor needs to be used to obtain the corresponding relationship table between different hydrogen mixing concentrations and MAP1 correction, MAP2 correction, which can be used as a standard comparison table, therefore, in subsequent actual application, there is no need to perform early calibration again, but only the actual reaction temperature t of the mixed gas with the preset target hydrogen concentration in the hydrogen consumption reactor needs to be measured, that is, in actual application, there is no need to set a hydrogen concentration sensor, and only step (3) needs to be performed in the hydrogen consumption control.

[0041] For example, assuming a 1% target hydrogen concentration mixture has a hydrogen proportioning valve duty cycle of 0.45 after MAP2 correction, corresponding to a hydrogen catalytic combustion temperature of 453K-473K, and a 1.5% target hydrogen concentration mixture has a hydrogen proportioning valve duty cycle of 0.55 after MAP2 correction, corresponding to a hydrogen catalytic combustion temperature of 503K-523K, then for a target hydrogen concentration in the range of 1%-1.5%, the relationship between the hydrogen proportioning valve duty cycle r and the hydrogen catalytic combustion temperature t is r = 0.002t - 0.476, and the hydrogen proportioning valve duty cycle correction value Δr... =0.002Δt, at the target hydrogen elimination concentration of 1%, if the hydrogen catalytic combustion temperature reaches 493K, exceeding the maximum threshold of 20K, the concentration of hydrogen in the mixture needs to be reduced by decreasing the duty cycle of the hydrogen proportional valve. Δr = 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, the flow rate of hydrogen is reduced, so that the hydrogen catalytic reaction temperature returns to the normal threshold range, and the hydrogen concentration in the mixture is controlled at the target hydrogen concentration.

[0042] In this application, hydrogen flow rate is corrected based on the actual reaction temperature during the hydrogen catalytic combustion reaction in the hydrogen removal reactor, achieving multi-dimensional hydrogen removal control without the need for a hydrogen concentration sensor. The following explanation assumes an air compressor as the air control component and a proportional valve as the hydrogen control component.

[0043] Air (oxygen) flow regulation refers to the fact that the air compressor's output volume is constant at a certain speed and pressure ratio, which can be calibrated into a multi-dimensional MAP1, i.e., "speed-pressure ratio-flow" data table MAP1. Based on the hydrogen inlet and outlet pressures and the pulse width control of the hydrogen proportional valve, it means that the proportional valve, under certain inlet and outlet pressures, opens at a certain duty cycle, resulting in a constant output volume, which can be calibrated into a multi-dimensional MAP2, i.e., "pre-valve pressure-post-valve pressure-opening duty cycle-flow" data table MAP2. Simultaneously, the oxygen flow rate can be calculated by multiplying by a coefficient of 0.21 (the oxygen content percentage in the air) based on the demand, from the air flow rate. Based on the hydrogen concentration of the target mixture, the amount of hydrogen and air (oxygen) in the mixture can be theoretically calculated, corresponding to the duty cycle of the proportional valve and the speed of the air compressor. 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 passing through the air compressor is V. Air Let V1 be the target hydrogen concentration and c1 be the target concentration of the mixed hydrogen. H2= (c1 / 1- c1) V1, V1 can be regarded as the instantaneous flow of air at a certain moment, and the speed of the air compressor can be obtained from V1 and the pressure ratio at the current moment, and the required hydrogen volume V can also be obtained H2 ; and the duty cycle of the proportional valve can be obtained from V H2 and the pressure before and after the proportional valve at the current moment, thereby realizing the mixing of the target hydrogen mixing gas.

[0044] In this application, based on the initial calibration of the reaction temperature of the mixed gas at each different hydrogen mixing concentration when performing hydrogen catalytic combustion reaction, the reaction temperature interval t1-t2 is obtained, and the relationship curve of each different hydrogen mixing concentration and the corresponding reaction temperature interval t1-t2 is formulated. The correction of the reaction temperature to the hydrogen flow refers to the use of a temperature sensor for calibration, the use of a noble metal catalyst in the hydrogen consumption reactor to catalyze the combustion of hydrogen in the mixed gas to generate heat, and the monitoring of the temperature change by the temperature sensor to judge the actual hydrogen mixing concentration. If there is a deviation between the actual hydrogen mixing concentration and the preset target hydrogen concentration, the control is performed. Generally, when the hydrogen concentration in the mixed gas is increased by 0.1%, the reaction temperature will increase by 9.71K when burning in the hydrogen consumption reactor, and the temperature of the hydrogen catalytic combustion in the hydrogen consumption reactor is generally lower than 800K. Therefore, based on the actual reaction temperature t of the hydrogen consumption reactor, the hydrogen concentration in the mixed gas can be corrected.

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

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

[0047] In some embodiments, when detecting the actual air flow, an air flow sensor is arranged on the air path to detect.

[0048] In some embodiments, when detecting the actual hydrogen flow, a hydrogen concentration sensor is arranged on the mixed gas pipeline to detect.

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

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

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

[0052] In some embodiments, multiple temperature sensors are used to detect the actual reaction temperature t of the hydrogen consumption reactor to obtain an average value.

[0053] In some embodiments, PID is used to correct the feedforward speed of the air regulating component.

[0054] In some embodiments, the PID is used to correct the feed-forward 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 lookup table values obtained according to calibration data. The detection value of the mixed gas reaction temperature can be the average value of multiple temperature sensors, which improves the accuracy of the judgment and prevents misjudgment. Therefore, based on the calibration of the air regulating component and the hydrogen regulating component of the air path and the hydrogen path in the early stage, the air flow under different hydrogen mixing concentration requirements is obtained by regulating the air regulating component such as the air compressor speed through the "feed-forward + feedback" corrected MAP1, the hydrogen flow is obtained by regulating the hydrogen regulating component such as the proportional valve duty cycle through the "feed-forward + feedback" corrected MAP2 combined with temperature correction, so that the mixed gas concentration after mixing hydrogen reaches the target hydrogen concentration, and the hydrogen elimination control without obtaining the hydrogen concentration is realized.

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

[0057] A hydrogen elimination system includes an air path, a hydrogen path, an air regulating component, a hydrogen regulating component, a gas mixing component, a hydrogen elimination reactor, a temperature sensor, an air flow sensor, and a control system. The air path and the hydrogen path are connected in parallel to the gas mixing component. The air regulating component is arranged in the air path. The hydrogen regulating component is arranged in the hydrogen path. The hydrogen elimination reactor is connected to the gas mixing component. The temperature sensor is connected to the hydrogen elimination reactor. The air flow sensor is arranged in the air path. The control system can execute the hydrogen elimination control method without obtaining the hydrogen concentration as described above.

[0058] The hydrogen elimination control method without obtaining the hydrogen concentration, through early data calibration, cancels the hydrogen concentration sensor with high price in the actual hydrogen elimination process, controls the hydrogen outlet amount based on the hydrogen inlet and outlet pressure of the hydrogen path and the opening duty cycle control of the hydrogen regulation component, and adjusts the air (oxygen) flow accordingly, so that the hydrogen mixing concentration is in the safe threshold range or the target concentration range; at the same time, the temperature of the hydrogen elimination reactor is monitored, the hydrogen flow is corrected based on the reaction temperature, and multi-dimensional hydrogen elimination safety control without hydrogen concentration sensor is realized. The hydrogen concentration sensor is only used in the early calibration stage, and the hydrogen elimination system applied in the actual engineering does not need to rely on expensive hydrogen concentration sensors, and can dynamically adjust the hydrogen path and air path regulation components according to the target hydrogen elimination concentration, and correct the hydrogen outlet amount through the real-time hydrogen elimination temperature at the back end, realize multi-dimensional control, realize uniform and stable hydrogen mixing, save the cost of hydrogen elimination device; the hydrogen elimination control method without obtaining the hydrogen concentration can be applied to batch intensive commercial hydrogen elimination devices or systems. The hydrogen elimination control method without obtaining the hydrogen concentration of the present application does not rely on the real-time hydrogen concentration feedback of the hydrogen concentration sensor in the actual application stage of hydrogen elimination control, but controls the hydrogen path outlet amount and the air path outlet amount according to the target hydrogen concentration based on the calibration data, and adjusts and corrects the hydrogen outlet amount according to the hydrogen elimination reaction temperature, realizes effective treatment of the discharged hydrogen, avoids the risk of hydrogen accumulation caused by direct discharge of hydrogen, avoids affecting the atmospheric environment, and has economic efficiency, safety and environmental protection.

[0059] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0060] Each technical feature of the above-described embodiments can be combined arbitrarily, and in order to make the description simple, not all possible combinations of each technical feature in the above-described embodiments are described, however, as long as the combination of these technical features does not exist contradictory, it should be considered as the scope of the description.

[0061] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A hydrogen elimination control method which does not require acquisition of a hydrogen gas concentration, characterized by, The method comprises the following steps: The air control component of the air path is calibrated to obtain a MAP1 based on a "rotation speed-pressure ratio-flow rate" relationship, and the hydrogen control component of the hydrogen path is calibrated to obtain a MAP2 based on a "valve front pressure-valve rear pressure-opening duty ratio-flow rate" relationship. The actual air flow rate of the air path is detected at each different hydrogen mixing concentration, and a target air flow rate corresponding to a target hydrogen mixing concentration is obtained, and a difference between the actual air flow rate and the target air flow rate is obtained as an air flow rate difference feedback, and a feedforward rotation speed of the air control component is corrected to make the actual air flow rate equal to the target air flow rate, and a corrected MAP1 of the air control component is obtained; The actual hydrogen concentration of the hydrogen path is detected, and a difference between the actual hydrogen concentration and the target hydrogen mixing concentration is obtained as a hydrogen concentration difference feedback, and a feedforward duty ratio of the hydrogen control component is corrected to make the actual hydrogen concentration equal to the target hydrogen mixing concentration, and a corrected MAP2 of the opening duty ratio of the hydrogen control component is obtained, and a corresponding relationship table between each different hydrogen mixing concentration and the MAP1 and the MAP2 is obtained and used as an air control component rotation speed lookup value and a hydrogen control component opening duty ratio lookup value of the air path at each different hydrogen mixing concentration without a hydrogen concentration sensor in actual application. The reaction temperature of the mixed gas at each different hydrogen mixing concentration when the hydrogen catalytic combustion reaction is performed is calibrated to obtain a reaction temperature interval t1-t2, and a relationship curve between each different hydrogen mixing concentration and the corresponding reaction temperature interval t1-t2 is formulated. In actual application of hydrogen elimination, a preset target hydrogen concentration is set, the mixed gas after actual hydrogen mixing enters the hydrogen elimination reactor to perform the hydrogen catalytic combustion reaction, the actual reaction temperature t of the hydrogen elimination 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 to determine whether the actual hydrogen mixing concentration of the mixed gas is within the target hydrogen mixing concentration range, wherein when t1≤t≤t2, the actual reaction temperature t is within a theoretical threshold interval, a first correction value is obtained, and no correction is needed; 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 ratio of the hydrogen control component needs to be reduced, a temperature deviation Δt=t-t2 is calculated, a second correction value of the duty ratio of the hydrogen control component is obtained based on the Δt and the fitting relationship curve between the reaction temperature and the duty ratio of the hydrogen control component, and the value is negative, and the duty ratio of the hydrogen control component is corrected based on the second correction value through the MAP2 correction. When t < t1, it indicates that the hydrogen concentration in the mixed gas is low, and the duty cycle of the hydrogen regulating component needs to be increased. The temperature deviation is calculated, and t = t1-t. Based on the fitting relationship curve of the temperature deviation and the reaction temperature and the duty cycle of the hydrogen proportional valve, the third correction value of the duty cycle of the hydrogen regulating component is obtained. The value is positive. Based on the third correction value, the duty cycle of the hydrogen regulating component is corrected by MAP2.

2. The hydrogen elimination control method without acquiring a hydrogen concentration according to claim 1, characterized by, The air regulating component includes an air compressor or a gas supply pump.

3. The hydrogen elimination control method without acquiring a hydrogen concentration according to claim 1, characterized by, The hydrogen regulating component includes a proportional valve or a hydrogen injection valve.

4. The hydrogen elimination control method without acquiring a hydrogen concentration according to claim 1, characterized by, When detecting the actual air flow, an air flow sensor is arranged in the air path to detect the actual air flow.

5. The hydrogen elimination control method without acquiring a hydrogen concentration according to claim 1, characterized by, When detecting the actual hydrogen flow, a hydrogen concentration sensor is arranged in the mixed gas pipeline to detect the actual hydrogen flow.

6. The hydrogen elimination control method without acquiring a hydrogen concentration according to claim 1, characterized by, The first correction value is 0.

7. The hydrogen elimination control method without acquiring the hydrogen concentration according to any one of claims 1 to 6, characterized by When detecting the actual reaction temperature t of the hydrogen removal reactor, a temperature sensor is used.

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

9. The hydrogen elimination control method without acquiring a hydrogen concentration according to any one of claims 1 to 6, characterized by, PID is used to correct the air regulating component feedforward speed. And / or, PID is used to correct the hydrogen regulating component feedforward duty cycle.

10. A hydrogen elimination system characterized by, The air path and the hydrogen path are connected in parallel to the mixed gas component. The air regulating component is arranged in the air path. The hydrogen regulating component is arranged in the hydrogen path. The hydrogen removal reactor is connected to the mixed gas component. The temperature sensor is connected to the hydrogen removal reactor. The air flow sensor is arranged in the air path. The control system can execute the hydrogen removal control method without obtaining the hydrogen concentration according to any one of claims 1-9.

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