CN111850591A - Combined diaphragm regulating valve device, alkaline electrolyzed water hydrogen production system and control method - Google Patents
Combined diaphragm regulating valve device, alkaline electrolyzed water hydrogen production system and control method Download PDFInfo
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- CN111850591A CN111850591A CN202010560970.2A CN202010560970A CN111850591A CN 111850591 A CN111850591 A CN 111850591A CN 202010560970 A CN202010560970 A CN 202010560970A CN 111850591 A CN111850591 A CN 111850591A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B13/00—Diaphragms; Spacing elements
- C25B13/02—Diaphragms; Spacing elements characterised by shape or form
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to a combined diaphragm regulating valve device, an alkaline electrolyzed water hydrogen production system and a control method. The combined diaphragm regulating valve device comprises a plurality of diaphragm regulating valve branches with different gas flow ranges and flow distributors for distributing the flow of each branch, the diaphragm regulating valve branches are arranged in parallel, the flow distributors are respectively connected with the diaphragm regulating valve branches, and in the working process, at least 1 diaphragm regulating valve branch works. The alkaline electrolyzed water hydrogen production system comprises an alkaline electrolyzed water hydrogen production device, an alkaline liquor circulating device and 2 combined diaphragm regulating valve devices, wherein the alkaline electrolyzed water hydrogen production device comprises an electrolytic bath, an oxygen side gas-liquid separator and a hydrogen side gas-liquid separator, the alkaline liquor circulating device is connected with the alkaline electrolyzed water hydrogen production device, and the combined diaphragm regulating valve devices are respectively arranged at the gas output ends of the oxygen side gas-liquid separator and the hydrogen side gas-liquid separator. Compared with the prior art, the invention ensures the safety of the alkaline electrolyzed water hydrogen production system in different working power ranges.
Description
Technical Field
The invention relates to the technical field of hydrogen production by alkaline electrolyzed water, in particular to a combined diaphragm regulating valve device, an alkaline electrolyzed water hydrogen production system and a control method.
Background
Hydrogen energy is considered to be one of the major strategic directions of energy and power transformation in the world, and is concerned by all countries in the world, and the most mature technical route in hydrogen production by water electrolysis is alkaline water electrolysis technology.
Chinese patent CN 110106512 a: the device for producing hydrogen by electrolyzing water comprises j parallel branches, wherein k hydrogen production units connected in series are arranged on each parallel branch, the hydrogen production device can be conveniently adjusted to different powers, and the hydrogen production device has more adjusting gears and is well adapted to the fluctuation change of input power when new energy (such as wind power, photovoltaic and the like) with intermittent property is used for generating power as a hydrogen production power supply.
Chinese patent CN 203582560U: an electrolytic cell exhaust device of an electrolytic water system provides an electrolytic cell exhaust device with surface gas forming air plugs in an acid water electromagnetic valve and an alkaline water electromagnetic valve, can improve uneven water outlet at two ends, improves the problems of equipment corrosion caused by acid gas and the like, and has certain value.
In the existing related researches, although the design of an electrolytic cell exhaust device is also carried out by using a plurality of water electrolysis hydrogen production units in the same system to meet power fluctuation, the problem that the accurate pressure regulation of a gas diaphragm valve of a gas-liquid separation module is difficult due to different gas flow quantities generated when alkaline water electrolysis hydrogen production equipment works under different powers is not considered, and the design of a combined regulation system for the diaphragm valve is lacked.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a combined diaphragm regulating valve device, an alkaline electrolyzed water hydrogen production system and a control method.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a modular diaphragm governing valve device, the device is used for gaseous discharge when alkaline electrolysis water hydrogen manufacturing, the device include a plurality of diaphragm governing valve branches that have different gas flow scope and the flow distributor that is used for each branch road flow distribution, diaphragm governing valve branch road parallel arrangement, flow distributor connect diaphragm governing valve branch road respectively, in the course of the work, at least 1 diaphragm governing valve branch road work.
The diaphragm regulating valve branch comprises diaphragm regulating valves and flow meters which are sequentially connected in series, and the diaphragm regulating valves and the flow meters of the diaphragm regulating valve branches are connected to the flow distributor to form a closed-loop accurate regulating circuit.
The flow ranges of the diaphragm regulating valves in the diaphragm regulating valve branches arranged in parallel are configured to change according to a gradient form.
The flow range of the diaphragm regulating valve is specifically configured as follows:
Qg1_max＞Qg2_max＞…＞Qgn_max，
Qg1_min＞Qg2_min＞…＞Qgn_min，
wherein Q isg1_maxIs the maximum gas flow, Q, of the diaphragm regulating valve in the 1 st branch of the diaphragm regulating valve g2_maxIs the maximum gas flow, Q, of the diaphragm regulating valve in the 2 nd branch of the diaphragm regulating valvegn_maxIs the maximum gas flow, Q, of the diaphragm regulating valve in the nth diaphragm regulating valve branchg1_minFor minimum gas flow, Q, of the diaphragm regulating valve in the 1 st branch of the diaphragm regulating valveg2_minFor minimum gas flow, Q, of diaphragm regulating valve in the 2 nd branch of diaphragm regulating valvegn_minFor diaphragm regulation in the nth diaphragm regulating valve branchThe minimum gas flow of the valve, and n is the total number of branches of the diaphragm regulating valve.
The flow distributor is configured to select a microprocessor chip corresponding to the working of the branch of the diaphragm regulating valve according to the gas flow requirement.
The utility model provides an alkaline electrolysis water hydrogen manufacturing system, includes alkaline electrolysis water hydrogen manufacturing installation and alkali lye circulating device, alkaline electrolysis water hydrogen manufacturing installation include electrolysis trough, oxygen side vapour and liquid separator and hydrogen side vapour and liquid separator, alkali lye circulating device connect alkaline electrolysis water hydrogen manufacturing installation, this system still includes 2 the combination formula diaphragm governing valve device, combination formula diaphragm governing valve device set up respectively in oxygen side vapour and liquid separator and hydrogen side vapour and liquid separator's gas output end.
Alkali lye circulating device include alkali lye supply pump, alkali lye filter, alkali lye circulating pump, alkali lye case, alkali lye circulating heat exchanger, coolant tank and cooling water pump, alkali lye filter input be connected to oxygen side vapour and liquid separator and hydrogen side vapour and liquid separator's alkali lye output, alkali lye filter output loops through alkali lye circulating pump and alkali lye circulating heat exchanger and is connected to electrolysis trough alkali lye input, alkali lye circulating heat exchanger still connects coolant tank through cooling water pump and forms heat transfer loop, alkali lye filter input still connects the alkali lye case through the supply pump and carries out the alkali lye supply.
A control method of an alkaline water electrolysis hydrogen production system is used for controlling a combined diaphragm regulating valve device in the alkaline water electrolysis hydrogen production system, and comprises the following steps:
(1) the flow distributor obtains the gas flow generated by the alkaline electrolyzed water hydrogen production system;
(2) judging whether any membrane regulating valve branch in the combined membrane regulating valve device has gas flow data, if so, executing the step (3), and otherwise, starting the membrane regulating valve branch with the highest gas flow range;
(3) and judging whether the gas flow generated by the alkaline electrolyzed water hydrogen production system is in the regulation interval of the currently started membrane regulating valve branch capable of accurately regulating and controlling the pressure, if so, keeping the current membrane regulating valve branch to operate, and otherwise, selecting the corresponding membrane regulating valve branch to operate according to the gas flow generated by the alkaline electrolyzed water hydrogen production system and the flow range of the current membrane regulating valve branch.
The step (3) is specifically as follows:
(31) calculating whether the gas flow generated by the alkaline electrolyzed water hydrogen production system is in the range of +/-phi at the edge of the gas flow range of the current diaphragm regulating valve branch, if so, executing the step (32), and otherwise, keeping the current diaphragm regulating valve branch to operate;
(32) Judging whether the gas flow rate of change generated by the alkaline electrolyzed water hydrogen production system is larger than or equal to +/-delta, if so: when the gas flow generated by the alkaline electrolyzed water hydrogen production system is higher than-phi of the current gas flow upper limit of the diaphragm regulating valve branch and the gas flow change rate is more than or equal to + delta, starting the diaphragm regulating valve branch with the gas flow range higher by one level, and when the gas flow generated by the alkaline electrolyzed water hydrogen production system is lower than + phi of the current gas flow lower limit of the diaphragm regulating valve branch and the gas flow change rate is less than or equal to-delta, starting the diaphragm regulating valve branch with the gas flow range lower by one level; otherwise, the current diaphragm regulating valve branch is kept running.
Compared with the prior art, the invention has the following advantages:
(1) the combined diaphragm regulating valve device is used for discharging gas during hydrogen production by alkaline electrolyzed water, can ensure accurate control of oxygen and hydrogen pressure at various hydrogen production rates, can greatly widen the working power range of an alkaline electrolyzed water hydrogen production system, and increases the wide power fluctuation adaptability of alkaline electrolyzed water hydrogen production equipment.
(2) The hydrogen production system of alkaline electrolyzed water is provided with the combined diaphragm regulating valves at the hydrogen and oxygen outlets respectively, so that the accurate control of the pressure of the hydrogen and the oxygen at each hydrogen production rate can be ensured, the pressure difference of the hydrogen side and the oxygen side at different flow rates can be kept within a set range, the mutual channeling of the hydrogen and the oxygen in the hydrogen production equipment of alkaline electrolyzed water is effectively prevented, and the safety of the hydrogen production equipment of alkaline electrolyzed water under different working powers is enhanced.
(3) The invention simultaneously considers the control method of the flow and the flow change rate, and reasonably starts each diaphragm regulating valve according to different working conditions, thereby accurately controlling the pressure under the rapid change of different gas flow and power and enhancing the safety of the alkaline electrolytic water hydrogen production equipment under different working powers.
Drawings
FIG. 1 is a block diagram of an alkaline electrolytic water hydrogen production system employing a combined diaphragm regulator valve assembly according to the present invention;
FIG. 2 is a block diagram of the operation principle of the combined diaphragm regulating valve device in the alkaline electrolyzed water hydrogen production system according to the present invention;
FIG. 3 is a flow chart of a control method of the alkaline electrolyzed water hydrogen production system according to the present invention;
FIG. 4 is a schematic diagram of hydrogen flow rate produced by the alkaline water electrolysis hydrogen production system in the embodiment of the invention;
FIG. 5 is a schematic diagram of the adjusting process of the hydrogen side combined diaphragm adjusting valve device of the hydrogen production system by alkaline electrolysis of water in the embodiment of the invention.
In the figure, 1 is an electrolytic bath, 2 is a rectifier transformer, 3 is an alkali liquor circulating heat exchanger, 4 is a cooling water tank, 5 is a cooling water pump, 6 is a hydrogen side combined diaphragm regulating valve device, 7 is a hydrogen side gas-liquid separator, 8 is hydrogen purification equipment, 9 is an oxygen side combined diaphragm regulating valve device, 10 is an oxygen collecting or post-processing device, 11 is an oxygen side gas-liquid separator, 12 is an alkali liquor replenishing pump, 13 is an alkali liquor filter, 14 is an alkali liquor circulating pump, and 15 is an alkali liquor tank.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiments is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiments.
Examples
As shown in figures 1 and 2, the combined diaphragm regulating valve device is used for discharging gas during hydrogen production by alkaline electrolysis of water, and comprises a plurality of diaphragm regulating valve branches with different gas flow ranges and flow distributors for flow distribution of the branches, wherein the diaphragm regulating valve branches are arranged in parallel, the flow distributors are respectively connected with the diaphragm regulating valve branches, and at least 1 diaphragm regulating valve branch works in the working process.
The membrane regulating valve branch comprises a membrane regulating valve and a flowmeter which are sequentially connected in series, and the membrane regulating valve and the flowmeter of each membrane regulating valve branch are connected to the flow distributor to form a closed-loop accurate regulating circuit.
The flow ranges of the diaphragm regulating valves in the diaphragm regulating valve branches arranged in parallel are configured to change according to a gradient form.
The flow range of the diaphragm regulating valve is specifically configured as follows:
Qg1_max＞Qg2_max＞…＞Qgn_max，
Qg1_min＞Qg2_min＞…＞Qgn_min，
wherein Q isg1_maxIs the maximum gas flow, Q, of the diaphragm regulating valve in the 1 st branch of the diaphragm regulating valve g2_maxIs the maximum gas flow, Q, of the diaphragm regulating valve in the 2 nd branch of the diaphragm regulating valvegn_maxIs the maximum gas flow, Q, of the diaphragm regulating valve in the nth diaphragm regulating valve branchg1_minFor minimum gas flow, Q, of the diaphragm regulating valve in the 1 st branch of the diaphragm regulating valveg2_minFor minimum gas flow, Q, of diaphragm regulating valve in the 2 nd branch of diaphragm regulating valvegn_minThe minimum gas flow of the diaphragm regulating valve in the nth branch of the diaphragm regulating valve is shown, and n is the total number of the branches of the diaphragm regulating valve.
The flow distributor is configured to select a microprocessor chip corresponding to the diaphragm regulating valve branch to operate according to the gas flow demand.
The utility model provides an alkaline electrolysis water hydrogen manufacturing system, including alkaline electrolysis water hydrogen manufacturing installation and alkali lye circulating device, alkaline electrolysis water hydrogen manufacturing installation includes electrolysis trough 1, oxygen side vapour and liquid separator 11 and hydrogen side vapour and liquid separator 7, alkali lye circulating device connects alkaline electrolysis water hydrogen manufacturing installation, this system still includes 2 combination formula diaphragm regulating valve devices, be hydrogen side combination formula diaphragm regulating valve device 6 and oxygen side combination formula diaphragm regulating valve device 9 respectively, hydrogen side combination formula diaphragm regulating valve device 6 and oxygen side combination formula diaphragm regulating valve device 9 correspond respectively and set up in the gas output end of hydrogen side vapour and liquid separator 7 and oxygen side vapour and liquid separator 11.
When the water electrolysis hydrogen production system works, alternating current power supply is converted into direct current power through the rectifier transformer 2 and enters the electrolytic cell 1, the electrolytic cell 1 is the core of the system, water in alkali liquor is electrolyzed into hydrogen and oxygen which are respectively separated out on the surface of an electrode, and the volume ratio of the hydrogen to the oxygen is approximately 2: 1, and enters a hydrogen and oxygen liquid outlet pipe and enters a gas-liquid separator. In the gas-liquid separator, the mixture of hydrogen, oxygen and alkali liquor flowing out from the electrolytic bath 1 respectively flows into a hydrogen-side gas-liquid separator 7 and an oxygen-side gas-liquid separator 11, after being washed and cooled by a hydrogen washing cooler in the morning, the gas and the liquid are separated under the action of gravity, the hydrogen and the oxygen are gradually separated and overflow from the alkali liquor, and are respectively discharged through a hydrogen-side combined diaphragm regulating valve device 6 and an oxygen-side combined diaphragm regulating valve device 9, the hydrogen is pressurized or stored after passing through a hydrogen purification device 8, and the oxygen enters an oxygen collecting or post-processing device 10.
The alkali liquor circulating device comprises an alkali liquor replenishing pump 12, an alkali liquor filter 13, an alkali liquor circulating pump 14, an alkali liquor box 15, an alkali liquor circulating heat exchanger 3, a cooling water tank 4 and a cooling water pump 5, the input end of the alkali liquor filter 13 is connected to the alkali liquor output ends of a hydrogen side gas-liquid separator 7 and an oxygen side gas-liquid separator 11, the output end of the alkali liquor filter 13 is connected to the electrolytic tank 1 through the alkali liquor circulating pump 14 and the alkali liquor circulating heat exchanger 3 in sequence, the alkali liquor circulating heat exchanger 3 is further connected with the cooling water tank 4 through the cooling water pump 5 to form a heat exchange loop, and the input end of the alkali liquor. The alkali liquor circulating system removes solid impurities from the alkali liquor discharged from the gas-liquid separator through an alkali liquor filter 13, then the alkali liquor is pumped into the alkali liquor circulating heat exchanger 3 through an alkali liquor circulating pump 14, and the alkali liquor enters the electrolytic tank 1 after heat exchange to form an alkali liquor closed-loop system. Meanwhile, as the water is continuously consumed by electrolyzing the water to produce hydrogen, the prepared electrolyte needs to be added with alkali liquor from the alkali liquor tank 15 to the alkali liquor circulation through the alkali liquor replenishing pump 12. The water electrolysis hydrogen production system has high energy consumption and needs cooling heat dissipation during normal work. In the cooling module, cooling deionized water stored in a cooling water tank 4 enters an electrolytic tank 1 through a cooling water pump 5, the temperature of the hydrogen production module is kept within a working range, and after the cooling deionized water flows out of the electrolyzed water hydrogen production module, the cooling water is cooled through an alkali liquor circulating heat exchanger 3 and enters the cooling water tank 4.
In this embodiment, the hydrogen-side combined diaphragm regulating valve device 6 is provided with n diaphragm regulating valve branches, and the oxygen-side combined diaphragm regulating valve device 9 is provided with m diaphragm regulating valve branches, so that the flow range of the diaphragm regulating valve of the hydrogen-side combined diaphragm regulating valve device 6 is specifically configured as follows:
QH1_max＞QH2_max＞…＞QHn_max，
QH1_min＞QH2_min＞…＞QHn_min，
wherein Q isH1_maxFor the maximum gas flow of the diaphragm regulating valve in the 1 st diaphragm regulating valve branch in the hydrogen side combined diaphragm regulating valve device 6, and the likeHn_maxIs the maximum gas flow Q of the diaphragm regulating valve in the nth diaphragm regulating valve branch in the hydrogen side combined type diaphragm regulating valve device 6H1_minFor the minimum gas flow of the diaphragm regulating valve in the 1 st diaphragm regulating valve branch in the hydrogen side combined diaphragm regulating valve device 6, with such Rui, QHn_minThe minimum gas flow of the diaphragm regulating valve in the nth diaphragm regulating valve branch is obtained.
The flow range of the membrane regulating valve of the oxygen side combined membrane regulating valve device 9 is specifically configured as follows:
QO1_max＞QO2_max＞…＞QOn_max，
QO1_min＞QO2_min＞…＞QOn_min，
wherein Q isO1_maxFor the maximum gas flow of the diaphragm regulating valve in the 1 st diaphragm regulating valve branch of the oxygen side combined diaphragm regulating valve device 9, in this way, QOm_maxIs the maximum gas flow Q of the diaphragm regulating valve in the mth diaphragm regulating valve branch in the oxygen side combined diaphragm regulating valve device 9 O1_minFor oxygen side combined type partitionMinimum gas flow of diaphragm regulating valve in the 1 st diaphragm regulating valve branch of the diaphragm regulating valve device 9, in this kind of Rui, QOm_minThe minimum gas flow of the diaphragm regulating valve in the mth diaphragm regulating valve branch of the oxygen side combined diaphragm regulating valve device 9 is obtained.
Therefore, the flow range of the hydrogen side combined type diaphragm regulating valve device 6, which can accurately regulate and control the pressure, is as follows:
QHn_min～QH1_max+QH2_max+…+QHn_max；
the flow range within which the oxygen side combined diaphragm regulating valve device 9 can accurately regulate and control pressure is as follows:
QOm_min～QO1_max+QO2_max+…+QOm_max。
compared with the gas diaphragm regulating valve adopting the same technical level, the maximum gas flow rate Q if the gas diaphragm regulating valve can accurately control the pressuremaxUnit is m3H, and Qmax＝QH1_maxThere must be a minimum gas flow Q at which the pressure can be accurately controlledminUnit is m3H and the minimum gas flow is less than the minimum regulating flow of the combined diaphragm regulating valve device, Qmin＞QHn_minThe same applies to the oxygen-side combination diaphragm regulator valve device 9. Therefore, the combined diaphragm valve adjusting system can greatly widen the flow range of the accurate pressure control of the hydrogen side and the oxygen side of the alkaline electrolyzed water hydrogen production system, thereby expanding the gas generation rate range and the working power interval of the alkaline electrolyzed water hydrogen production system.
As shown in fig. 3, a method for controlling a combined diaphragm regulating valve device in an alkaline electrolyzed water hydrogen production system comprises the following steps:
(1) the flow distributor obtains the gas flow generated by the alkaline electrolyzed water hydrogen production system;
(2) judging whether any membrane regulating valve branch in the combined membrane regulating valve device has gas flow data, if so, executing the step (3), and otherwise, starting the membrane regulating valve branch with the highest gas flow range;
(3) and judging whether the gas flow generated by the alkaline electrolyzed water hydrogen production system is in the regulation interval of the currently started membrane regulating valve branch capable of accurately regulating and controlling the pressure, if so, keeping the current membrane regulating valve branch to operate, and otherwise, selecting the corresponding membrane regulating valve branch to operate according to the gas flow generated by the alkaline electrolyzed water hydrogen production system and the flow range of the current membrane regulating valve branch.
The step (3) is specifically as follows:
(31) calculating whether the gas flow generated by the alkaline electrolyzed water hydrogen production system is in the range of +/-phi at the edge of the gas flow range of the current diaphragm regulating valve branch, if so, executing the step (32), and otherwise, keeping the current diaphragm regulating valve branch to operate;
(32) Judging whether the gas flow rate of change generated by the alkaline electrolyzed water hydrogen production system is larger than or equal to +/-delta, if so: when the gas flow generated by the alkaline electrolyzed water hydrogen production system is higher than-phi of the current gas flow upper limit of the diaphragm regulating valve branch and the gas flow change rate is more than or equal to + delta, starting the diaphragm regulating valve branch with the gas flow range higher by one level, and when the gas flow generated by the alkaline electrolyzed water hydrogen production system is lower than + phi of the current gas flow lower limit of the diaphragm regulating valve branch and the gas flow change rate is less than or equal to-delta, starting the diaphragm regulating valve branch with the gas flow range lower by one level; otherwise, the current diaphragm regulating valve branch is kept running.
This embodiment has set up an alkaline electrolysis water hydrogen manufacturing system, and hydrogen side combined diaphragm regulating valve device 6 and oxygen side combined diaphragm regulating valve device 9 equally divide and do not set up 4 diaphragm regulating valve branches, and the flow scope of 4 diaphragm regulating valves does: the flow range of the 1 st diaphragm regulating valve is 250-350 m3The flow range of the No. 2 diaphragm regulating valve is 200-300 m3The flow range of the No. 3 diaphragm regulating valve is 100-200 m3The flow range of the 4 th diaphragm regulating valve is 50-100 m3H is used as the reference value. Therefore, the combined diaphragm regulating valve system can accurately control the flow range of pressure to be far larger than that of a single gas diaphragm regulating valve with the same technical level.
Referring to fig. 4, an embodiment of a combined diaphragm regulating valve system and a management method will be described by taking a gas flow rate on the hydrogen side of an alkaline electrolyzed water hydrogen production apparatus as an example, and referring to fig. 5 is a case of a gas diaphragm valve in which the combined diaphragm regulating valve is activated at different flow rates. The adjustment section edge value condition + -phi is + -30m in the determination condition3H, flow rate change rate +/-30 m3/h·s。
Before the time when t is 0s, the hydrogen flow produced by the hydrogen production equipment is stabilized at 340m3The combined diaphragm valve system starts a 1 st diaphragm regulating valve, and the flow range of the 1 st diaphragm regulating valve capable of accurately controlling pressure is 250-350 m3The gas flow is within the regulating interval of the diaphragm valve and is also-30 m of the upper limit of the regulating interval of the 1 st diaphragm regulating valve3H s, but the rate of change of gas flow is zero, so the 1 st diaphragm regulator valve is still enabled.
The hydrogen flow rate is gradually reduced to 280m between t and 1-6 s3The gas flow is in the regulating range of the diaphragm valve, and is still more than or equal to +30m of the lower limit of the regulating range of the 1 st diaphragm regulating valve3H, i.e. 280m3H and the gas flow change rate is more than-30 m3H s, so the 1 st diaphragm regulator valve is still enabled.
At t, 6-7 s, the hydrogen flow produced by the hydrogen production equipment is stabilized at 280m 3The combined diaphragm valve system starts a 1 st diaphragm regulating valve, and the flow interval of the 1 st diaphragm regulating valve, which can accurately control pressure, is 250-350 m3The gas flow is in the regulating range of the diaphragm valve, and is still more than or equal to +30m of the lower limit of the regulating range of the 1 st diaphragm regulating valve3H, i.e. 280m3H, and the gas flow rate of change is zero, so the 1 st diaphragm regulator valve is still enabled.
At t 8s, the hydrogen flow rate of the hydrogen production plant is reduced to 280m3And h, enabling a 1 st diaphragm regulating valve of the combined diaphragm valve system, wherein the flow range of the 1 st diaphragm regulating valve capable of accurately controlling pressure is 250-350 m m3The gas flow is in the adjusting range of the diaphragm valve and is less than +30m of the lower limit of the adjusting range of the 1 st diaphragm adjusting valve3/h，I.e. 280m3H, and the change rate of the airflow is less than or equal to-30 m3H · s, therefore, the lower stage diaphragm regulator needs to be enabled, in combination with the current 1 st diaphragm regulator, and therefore the 2 nd diaphragm regulator.
When t is 9-10 s, the hydrogen flow produced by the hydrogen production equipment is gradually reduced to 210m3The combined diaphragm valve system starts a No. 2 diaphragm regulating valve, and the flow interval of the No. 2 diaphragm regulating valve, which can accurately control pressure, is 200-300 m3The gas flow is in the adjusting range of the diaphragm valve, although is less than +30m of the lower limit of the adjusting range of the 2 nd diaphragm adjusting valve 3H, i.e. 230m3H, but the rate of change of the gas flow is greater than or equal to-30 m3H s, so the 2 nd diaphragm regulator valve is still enabled.
At t-11 s, the hydrogen flow rate produced by the hydrogen production equipment is reduced to 190m3And h, starting a No. 2 diaphragm regulating valve of the combined diaphragm valve system, wherein the flow range of the No. 2 diaphragm regulating valve capable of accurately controlling pressure is 200-300 m3And h, the gas flow is smaller than the adjustment range of the diaphragm valve, so that a lower-stage diaphragm adjusting valve needs to be started, and a No. 2 diaphragm adjusting valve is started at present, so that a No. 3 diaphragm adjusting valve is started.
When t is 12-13 s, the hydrogen flow produced by the hydrogen production equipment is gradually reduced to 110m3The combined diaphragm valve system starts a No. 3 diaphragm regulating valve, and the flow interval of the No. 3 diaphragm regulating valve, which can accurately control pressure, is 100-200 m3The gas flow is less than +30m of the lower limit of the regulation interval of the 2 nd diaphragm regulating valve in the regulation interval of the diaphragm valve3H, i.e. 130m3H, but the rate of change of the gas flow is less than or equal to-30 m3H s, thus activating the 4 th diaphragm regulator valve.
At t being 14-15 s, the hydrogen flow produced by the hydrogen production equipment is reduced and kept at 70m3The 4 th diaphragm regulating valve is started in the combined diaphragm valve system, and the flow range of the 4 th diaphragm regulating valve capable of accurately controlling pressure is 0-100 m 3The gas flow is in the adjusting range of the diaphragm valve and is more than or equal to-30 m of the lower limit of the adjusting range of the 2 nd diaphragm adjusting valve3H, i.e. 70m3H, but the gas flow variesThe rate is zero and therefore the 4 th diaphragm regulator valve is still enabled.
At t 16s, the hydrogen flow rate of the hydrogen production equipment is increased to 100m3The 4 th diaphragm regulating valve is started in the combined diaphragm valve system, and the flow range of the 4 th diaphragm regulating valve capable of accurately controlling pressure is 0-100 m3The gas flow is in the adjusting range of the diaphragm valve and is more than or equal to-30 m ^3/h, namely 70m, of the lower limit of the adjusting range of the 2 nd diaphragm adjusting valve3H, the air flow change rate is greater than or equal to +30m3H s, thus activating the 3 rd diaphragm regulator valve.
At t 17-20 s, the hydrogen flow produced by the hydrogen production equipment is increased and stabilized at 120m3The combined diaphragm valve system starts a No. 3 diaphragm regulating valve, and the flow interval of the No. 3 diaphragm regulating valve, which can accurately control pressure, is 100-200 m3The gas flow is less than +30m of the lower limit of the regulation interval of the 2 nd diaphragm regulating valve in the regulation interval of the diaphragm valve3H, i.e. 130m3H, but the rate of change of the gas flow is greater than or equal to-30 m3H s, so the 3 rd diaphragm regulator valve is still enabled.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (9)
1. The combined diaphragm regulating valve device is characterized by being used for discharging gas during hydrogen production by alkaline electrolysis of water, and comprising a plurality of diaphragm regulating valve branches with different gas flow ranges and flow distributors for flow distribution of the branches, wherein the diaphragm regulating valve branches are arranged in parallel, the flow distributors are respectively connected with the diaphragm regulating valve branches, and at least 1 diaphragm regulating valve branch works in the working process.
2. The combined diaphragm regulating valve device according to claim 1, wherein the diaphragm regulating valve branch comprises a diaphragm regulating valve and a flow meter which are connected in series in sequence, and the diaphragm regulating valve and the flow meter of each diaphragm regulating valve branch are connected to a flow distributor to form a closed-loop precise regulating circuit.
3. The combined diaphragm regulating valve device according to claim 2, wherein the flow ranges of the diaphragm regulating valves in the parallel-arranged diaphragm regulating valve branches are configured to vary in a gradient manner.
4. A modular diaphragm regulator valve assembly as defined in claim 3 wherein the flow range of the diaphragm regulator valve is specifically configured to:
Qg1_max＞Qg2_max＞…＞Qgn_max，
Qg1_min＞Qg2_min＞…＞Qgn_min，
Wherein Q isg1_maxIs the maximum gas flow, Q, of the diaphragm regulating valve in the 1 st branch of the diaphragm regulating valveg2_maxIs the maximum gas flow, Q, of the diaphragm regulating valve in the 2 nd branch of the diaphragm regulating valvegn_maxIs the maximum gas flow, Q, of the diaphragm regulating valve in the nth diaphragm regulating valve branchg1_minFor minimum gas flow, Q, of the diaphragm regulating valve in the 1 st branch of the diaphragm regulating valveg2_minFor minimum gas flow, Q, of diaphragm regulating valve in the 2 nd branch of diaphragm regulating valvegn_minThe minimum gas flow of the diaphragm regulating valve in the nth branch of the diaphragm regulating valve is shown, and n is the total number of the branches of the diaphragm regulating valve.
5. The modular diaphragm regulator valve assembly of claim 1, wherein the flow divider is configured to select the microprocessor chip for operation of the corresponding diaphragm regulator valve branch based on the gas flow demand.
6. The alkaline electrolyzed water hydrogen production system comprises an alkaline electrolyzed water hydrogen production device and an alkaline liquid circulating device, wherein the alkaline electrolyzed water hydrogen production device comprises an electrolytic bath (1), an oxygen side gas-liquid separator (11) and a hydrogen side gas-liquid separator (7), and the alkaline liquid circulating device is connected with the alkaline electrolyzed water hydrogen production device, and the alkaline electrolyzed water hydrogen production system is characterized by further comprising 2 combined diaphragm regulating valve devices according to any one of claims 1-5, and the combined diaphragm regulating valve devices are respectively arranged at the gas output ends of the oxygen side gas-liquid separator (11) and the hydrogen side gas-liquid separator (7).
7. The system for producing hydrogen by electrolyzing water with alkalinity as claimed in claim 6, wherein the lye circulating device comprises a lye supply pump (12), a lye filter (13), a lye circulating pump (14), a lye tank (15), a lye circulating heat exchanger (3), a cooling water tank (4) and a cooling water pump (5), alkali lye filter (13) input be connected to the oxygen side gas-liquid separator (11) and the alkali lye output of hydrogen side gas-liquid separator (7), alkali lye filter (13) output loop through alkali lye circulating pump (14) and alkali lye circulating heat exchanger (3) and be connected to electrolysis trough (1) alkali lye input, cooling water tank (4) formation heat transfer circuit is still connected through cooling water pump (5) in alkali lye circulating heat exchanger (3), alkali lye filter (13) input still carries out the alkali lye supply through replenishing pump (12) connection alkali lye case (15).
8. A method for controlling an alkaline water electrolysis hydrogen production system, which is used for controlling the combined diaphragm regulating valve device in the alkaline water electrolysis hydrogen production system according to claim 6, and comprises the following steps:
(1) the flow distributor obtains the gas flow generated by the alkaline electrolyzed water hydrogen production system;
(2) judging whether any membrane regulating valve branch in the combined membrane regulating valve device has gas flow data, if so, executing the step (3), and otherwise, starting the membrane regulating valve branch with the highest gas flow range;
(3) And judging whether the gas flow generated by the alkaline electrolyzed water hydrogen production system is in the regulation interval of the currently started membrane regulating valve branch capable of accurately regulating and controlling the pressure, if so, keeping the current membrane regulating valve branch to operate, and otherwise, selecting the corresponding membrane regulating valve branch to operate according to the gas flow generated by the alkaline electrolyzed water hydrogen production system and the flow range of the current membrane regulating valve branch.
9. The control method of the alkaline electrolyzed water hydrogen production system according to claim 8, wherein the step (3) is specifically as follows:
(31) calculating whether the gas flow generated by the alkaline electrolyzed water hydrogen production system is in the range of +/-phi at the edge of the gas flow range of the current diaphragm regulating valve branch, if so, executing the step (32), and otherwise, keeping the current diaphragm regulating valve branch to operate;
(32) judging whether the gas flow rate of change generated by the alkaline electrolyzed water hydrogen production system is larger than or equal to +/-delta, if so: when the gas flow generated by the alkaline electrolyzed water hydrogen production system is higher than-phi of the current gas flow upper limit of the diaphragm regulating valve branch and the gas flow change rate is more than or equal to + delta, starting the diaphragm regulating valve branch with the gas flow range higher by one level, and when the gas flow generated by the alkaline electrolyzed water hydrogen production system is lower than + phi of the current gas flow lower limit of the diaphragm regulating valve branch and the gas flow change rate is less than or equal to-delta, starting the diaphragm regulating valve branch with the gas flow range lower by one level; otherwise, the current diaphragm regulating valve branch is kept running.
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