CN116065191A - Water electrolysis hydrogen production system and water replenishing control method thereof - Google Patents
Water electrolysis hydrogen production system and water replenishing control method thereof Download PDFInfo
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Abstract
The invention relates to a water electrolysis hydrogen production system and a water replenishing control method thereof. The water replenishing control method is applied to a water electrolysis hydrogen production system, and comprises the following steps: in the process of water electrolysis hydrogen production, determining the working state of a water electrolysis hydrogen production system; according to the working state of the water electrolysis hydrogen production system, the water supplementing pump is controlled to continuously supplement water into the washer, and liquid in the washer flows into the separator, so that the liquid level of the liquid in the separator is within a preset liquid level range. The invention can improve the washing effect of the washer by continuously supplementing water to the washer.
Description
Technical Field
The invention relates to the technical field of water electrolysis hydrogen production, in particular to a water electrolysis hydrogen production system and a water supplementing control method thereof.
Background
In the hydrogen production process of the alkaline water electrolysis hydrogen production system, a scrubber is used for scrubbing gas produced by an electrolytic cell. At present, water treated by the water purification complete equipment is supplemented into the washer through the water supplementing pump, then enters the separator through the overflow port of the washer, and alkali liquor is cooled by the alkali liquor heat exchanger from the separator and then enters the electrolytic tank through the alkali liquor circulating pump. The whole process controls the water replenishing time according to the liquid level in the separator, and alkali liquor in the separator is continuously injected into the electrolytic tank through an alkali liquor circulating pump so as to replenish water consumed by electrolysis in the electrolytic tank.
However, the water replenishing in the existing scrubber is intermittent water replenishing, the water replenishing is started only when the liquid level of the separator reaches a low point, the water replenishing is stopped when the liquid level of the separator reaches a high point, and no water replenishing action is performed in the rest time period, so that the concentration and the temperature of the washing liquid in the scrubber can continuously rise in the no water replenishing action time period, and the washing effect is affected.
Disclosure of Invention
The invention provides a water electrolysis hydrogen production system and a water supplementing control method thereof, which can improve the washing effect of a washer through continuous water supplementing.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a water supplementing control method which is applied to a water electrolysis hydrogen production system, and comprises the following steps:
in the process of water electrolysis hydrogen production, determining the working state of the water electrolysis hydrogen production system;
and according to the working state of the water electrolysis hydrogen production system, controlling a water supplementing pump to continuously supplement water into the washer, and enabling liquid in the washer to flow into the separator so as to realize that the liquid level of the liquid in the separator is within a preset liquid level range.
Optionally, according to the operating condition of the water electrolysis hydrogen production system, controlling a water supplementing pump to continuously supplement water into the scrubber, wherein liquid in the scrubber flows into the separator, so that the liquid level of the liquid in the separator is within a preset liquid level range, and the method comprises the following steps:
according to the working state of the water electrolysis hydrogen production system, the water supplementing pump is controlled to continuously supplement water into the washer, so that the water supplementing amount of the water supplementing pump is matched with the liquid circulation amount of the water electrolysis hydrogen production system, and the liquid in the washer flows into the separator, so that the liquid level variation of the liquid in the separator is within a preset deviation range.
Optionally, according to the operating condition of the water electrolysis hydrogen production system, the continuous water replenishing of the water replenishing pump in the scrubber is controlled, including:
when the water electrolysis hydrogen production system is in a stable power hydrogen production state, the water supplementing pump is controlled to continuously supplement water into the scrubber in a fixed-frequency water supplementing mode.
Optionally, when the water electrolysis hydrogen production system is in a stable power hydrogen production state, controlling the water supplementing pump to continuously supplement water into the scrubber in a fixed-frequency water supplementing mode, including:
when the water electrolysis hydrogen production system is in a stable power hydrogen production state, the water supplementing quantity of the water supplementing pump is obtained according to the hydrogen production power of the electrolytic tank in the water electrolysis hydrogen production system, and the water supplementing pump is controlled according to the water supplementing quantity of the water supplementing pump to realize fixed-frequency water supplementing.
Optionally, according to the operating condition of the water electrolysis hydrogen production system, the continuous water replenishing of the water replenishing pump in the scrubber is controlled, including:
when the water electrolysis hydrogen production system is in an unstable power hydrogen production state, the water supplementing pump is controlled to continuously supplement water into the scrubber in a variable frequency water supplementing mode.
Optionally, when the water electrolysis hydrogen production system is in an unstable power hydrogen production state, controlling the water supplementing pump to continuously supplement water into the scrubber in a variable frequency water supplementing mode, including:
when the water electrolysis hydrogen production system is in an unstable power hydrogen production state and the hydrogen production power of the electrolytic tank is increased, controlling the water supplementing pump to supplement water in the scrubber to increase the water supplementing amount so that the water supplementing amount of the water supplementing pump is matched with the liquid circulation amount flowing into the electrolytic tank.
Optionally, when the water electrolysis hydrogen production system is in an unstable power hydrogen production state, controlling the water supplementing pump to continuously supplement water into the scrubber in a variable frequency water supplementing mode, including:
when the water electrolysis hydrogen production system is in an unstable power hydrogen production state and the hydrogen production power of the electrolytic tank is reduced, controlling the water supplementing pump to supplement water in the scrubber to reduce the water supplementing amount so that the water supplementing amount of the water supplementing pump is matched with the liquid circulation amount flowing into the electrolytic tank.
Optionally, the controlling the water supplementing pump continuously supplements water in the washer in a variable-frequency water supplementing mode, including:
and determining the water supplementing quantity of the water supplementing pump according to the liquid level change rate of the liquid in the separator, and controlling the water supplementing pump to realize variable-frequency water supplementing according to the water supplementing quantity of the water supplementing pump.
The invention also provides a water electrolysis hydrogen production system, which comprises:
a controller and a water supplementing pump;
the water supplementing pump is controlled by the controller;
the controller is configured to execute the water replenishment control method as described above.
Optionally, the method further comprises:
a scrubber and a separator;
the liquid supplementing end of the washer is communicated with the water supplementing pump, and the liquid overflowing end of the washer is communicated with the input end of the separator.
Optionally, the method further comprises:
an electrolytic cell;
the liquid supplementing end of the electrolytic tank is communicated with the liquid output end of the separator, and the air outlet end of the electrolytic tank is communicated with the air input end of the separator.
Optionally, the method further comprises:
a circulation pump;
the input end of the circulating pump is communicated with the liquid output end of the separator, and the output end of the circulating pump is communicated with the liquid supplementing end of the electrolytic tank.
Optionally, the method further comprises:
a heat exchanger;
the input end of the heat exchanger is communicated with the liquid output end of the separator, and the output end of the heat exchanger is communicated with the input end of the circulating pump.
According to the technical scheme, the invention discloses a water electrolysis hydrogen production system and a water replenishing control method thereof, and the working state of the water electrolysis hydrogen production system is determined in the water electrolysis hydrogen production process; according to the working state of the water electrolysis hydrogen production system, the water supplementing pump is controlled to continuously supplement water into the washer, liquid in the washer flows to the separator, and the liquid in the separator flows into the electrolytic tank, so that the liquid level of the liquid in the separator is within a preset liquid level range. The invention can improve the washing effect of the washer by continuously supplementing water to the washer.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a water replenishment control method provided by an embodiment of the invention;
FIG. 2 is a flow chart of another water replenishment control method according to the embodiment of the present invention;
FIG. 3 is a flowchart of another water replenishment control method according to an embodiment of the present invention;
FIG. 4 is a block diagram of a water electrolysis hydrogen production system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a water supplementing control method which is applied to a water electrolysis hydrogen production system. Alternatively, the aqueous electrolytic hydrogen production system may be an alkaline aqueous electrolytic hydrogen production system. The alkaline solution is consumed in the hydrogen production process of the electrolytic tank, the gas generated by the electrolytic tank can bring the alkaline solution to the separator, the gas with the alkaline solution is sent to the scrubber for cleaning through the separator, the temperature and the concentration of the alkaline solution in the scrubber can be increased in the process of cleaning the gas by the scrubber, and the gas generated by the electrolytic tank can be hydrogen and oxygen. In order to improve the cleaning effect, the water treated by the water purification complete equipment is supplemented into the scrubber through the water supplementing pump so as to reduce the temperature and concentration of liquid in the scrubber, reduce the alkalinity of gas discharged from the scrubber and meet the requirement of subsequent hydrogen purification equipment on the alkalinity of the gas.
At present, most of water replenishing in the washer is intermittent water replenishing, water replenishing is started only when the liquid level of the separator reaches a low point, water replenishing is stopped when the liquid level of the separator reaches a high point, and water replenishing is not carried out in other time periods, so that the concentration and the temperature of the washing liquid in the washer can continuously rise in the water replenishing-free operation time period, and the washing effect is influenced.
Based on this, the present invention provides a water replenishment control method, as shown in fig. 1, comprising:
step 101: in the process of water electrolysis hydrogen production, the working state of the water electrolysis hydrogen production system is determined.
The operating conditions of the hydro-electrolytic hydrogen production system may include a steady power hydrogen production condition and an unsteady power hydrogen production condition. The stable power means that the power variation of hydrogen production power of the electrolytic cell is smaller than the preset power variation within a preset time period.
For the stable power hydrogen production state of the water electrolysis hydrogen production system, the hydrogen production power of the electrolytic tank is kept at a set power value within a preset time period t, or the hydrogen production power of the electrolytic tank is fluctuated at the set power value within the preset time period t, and the limit value of the hydrogen production power fluctuation interval does not exceed the preset power variation, so that the working state of the water electrolysis hydrogen production system is the stable power hydrogen production state.
For the unstable power hydrogen production state of the water electrolysis hydrogen production system, when a startup procedure is started for the water electrolysis hydrogen production system, the hydrogen production power of the electrolytic tank does not reach a set power value, and in the process that the hydrogen production power of the electrolytic tank is increased to reach the set power value, the power variation of the hydrogen production power of the electrolytic tank is larger than the preset power variation within a preset time period t.
For the unstable power hydrogen production state of the water electrolysis hydrogen production system, when a shutdown procedure is started for the water electrolysis hydrogen production system, the hydrogen production power of the electrolytic tank is gradually reduced to 0 from a set power value, and the power variation of the hydrogen production power of the electrolytic tank is larger than the preset power variation within a preset time period t.
Optionally, the preset time period t may be a time period when the hydrogen production power of the electrolytic tank is increased to reach the set power value, and the preset time period t may also be a time period when the hydrogen production power of the electrolytic tank is reduced from the set power value to 0. Of course, in practical application, the preset time period t includes, but is not limited to, but is not specifically limited herein, and may be determined according to the specific situation.
Step 102: according to the working state of the water electrolysis hydrogen production system, the water supplementing pump is controlled to continuously supplement water into the washer, and liquid in the washer flows into the separator, so that the liquid level of the liquid in the separator is within a preset liquid level range.
The scrubber cleans the gas with alkali liquor, removes the alkali liquor carried by the gas, continuously supplements water into the scrubber by controlling the water supplementing pump, and can continuously reduce the concentration and the temperature of the alkali liquor for the liquid in the scrubber so as to improve the cleaning effect of the hydrogen and meet the requirement of subsequent hydrogen purification equipment on the alkalinity of the hydrogen.
In the process of controlling the water supplementing pump to continuously supplement water into the washer, the liquid level of the liquid in the separator is required to be within a preset liquid level range. The liquid in the scrubber enters the separator through the overflow port of the scrubber, and in order to ensure the gas-liquid separation effect of the separator, the liquid level of the liquid in the separator is required to be positioned in a preset liquid level interval. If the liquid level in the separator is higher than the upper limit value of the liquid level, the gas-liquid separation is not clean, and the gas contains more alkali liquor; if the liquid level in the separator is lower than the lower limit value of the liquid level, the two gases may be mixed, and the purity of the gases is reduced.
In order to avoid the influence of continuous rising of the concentration and the temperature of the washing liquid in the washer on the washing effect, the invention can control the water supplementing pump to continuously supplement water into the washer, and can control the water supplementing amount according to the working state of the water electrolysis hydrogen production system when controlling the water supplementing pump to continuously supplement water into the washer so as to realize that the liquid level of the liquid in the separator is within the preset liquid level range, thereby ensuring the gas-liquid separation effect of the separator.
In an alternative embodiment, the present invention provides a water replenishment control method, as shown in fig. 2, comprising:
step 201: in the process of water electrolysis hydrogen production, the working state of the water electrolysis hydrogen production system is determined.
Step 201 is similar to step 101 shown in fig. 1 and will not be described again.
Step 202: according to the working state of the water electrolysis hydrogen production system, the water supplementing pump is controlled to continuously supplement water into the washer, so that the water supplementing amount of the water supplementing pump is matched with the liquid circulation amount of the water electrolysis hydrogen production system, the liquid in the washer flows into the separator, and the liquid level variation of the liquid in the separator is within a preset deviation range.
In the water electrolysis hydrogen production system, in the water electrolysis hydrogen production process, liquid flows into an electrolytic tank from a separator to supplement liquid consumed by electrolysis of the electrolytic tank and liquid entrained by gas. The liquid circulation amount of the water electrolysis hydrogen production system may be the liquid amount flowing into the electrolytic tank, the liquid circulation amount varies with the hydrogen production power according to the electrolytic tank, when the hydrogen production power of the electrolytic tank increases, the liquid circulation amount increases accordingly, and when the hydrogen production power of the electrolytic tank decreases, the liquid circulation amount decreases accordingly.
In the process of controlling the water supplementing pump to continuously supplement water into the scrubber, the liquid of the water supplementing pump flows into the scrubber, the liquid of the scrubber flows into the separator through the overflow port, and the liquid of the separator flows into the electrolytic tank. The working state of the water electrolysis hydrogen production system is different, and the liquid consumption of the electrolytic tank is different. If the amount of liquid consumed by the electrolytic tank is small and the amount of water supplied by the water supply pump is large, the amount of liquid supplied from the water supply pump to the separator is large, and at this time, the amount of water supplied by the water electrolysis hydrogen production system is larger than the amount consumed, the liquid level of the liquid in the separator rises, and the fluctuation of the liquid level is large. If the amount of liquid consumed by the electrolytic tank is large and the amount of water supplied by the water supply pump is small, the amount of liquid flowing into the separator from the water supply pump is small, and at this time, the amount of water supplied by the water electrolysis hydrogen production system is smaller than the amount consumed, the liquid level of the liquid in the separator is lowered, and the fluctuation of the liquid level is large.
When the fluctuation of the liquid level of the separator is large, the phenomenon of gas-liquid entrainment can be generated, and the gas-liquid separation is not clean, so that more alkali liquor is contained in the gas. Therefore, in order to avoid the problem that the gas separation effect is reduced due to large fluctuation of the liquid level, the water supplementing amount of the water supplementing pump can be controlled so as to be matched with the liquid circulation amount of the water electrolysis hydrogen production system, namely, in the working states of different water electrolysis hydrogen production systems, the water supplementing pump is controlled so as to be matched with the corresponding water supplementing amount, so that the liquid water supplementing amount and the liquid consumption amount are balanced, and the liquid level variation of the liquid in the separator is realized within a preset deviation range.
As an alternative embodiment, according to the operating state of the water electrolysis hydrogen production system, the continuous water supplementing of the water supplementing pump into the scrubber is controlled, comprising:
when the water electrolysis hydrogen production system is in a stable power hydrogen production state, the water supplementing pump is controlled to continuously supplement water into the scrubber in a fixed-frequency water supplementing mode.
When the water electrolysis hydrogen production system is in a stable power hydrogen production state, the hydrogen production power of the electrolytic tank runs according to a set power value, the liquid amount consumed by hydrogen production of the electrolytic tank is stable, the water supplementing amount is stable when the water supplementing pump adopts fixed-frequency water supplementing, and at the moment, the water supplementing amount and the consumption amount of the water electrolysis hydrogen production system are balanced, so that the liquid level of the liquid in the separator is in a preset liquid level range, and the liquid level variation of the liquid in the separator is in a preset deviation range. In addition, the concentration and the temperature of alkali liquor in the scrubber can be reduced and the hydrogen cleaning effect is improved by controlling the water supplementing pump to continuously supplement water into the scrubber.
Optionally, when the water electrolysis hydrogen production system is in a stable power hydrogen production state, controlling the water supplementing pump to continuously supplement water into the scrubber in a fixed-frequency water supplementing mode, including:
when the water electrolysis hydrogen production system is in a stable power hydrogen production state, the water supplementing quantity of the water supplementing pump is obtained according to the hydrogen production power of the electrolytic tank in the water electrolysis hydrogen production system, and the water supplementing pump is controlled according to the water supplementing quantity of the water supplementing pump to realize fixed-frequency water supplementing.
The water electrolysis hydrogen production system is in a stable power hydrogen production state, the hydrogen production power of the electrolytic tank is kept at a set power value, the liquid circulation amount of the water electrolysis hydrogen production system is fixed, and the liquid amount of the liquid consumed by the electrolytic tank is also fixed. When the liquid level in the separator falls in a set liquid level interval, the liquid level falling rate can be obtained, and the water supplementing quantity of the water supplementing pump can be calculated according to the liquid level falling rate. The water supplementing pump is controlled to continuously supplement water so as to realize the compensation of the liquid level in the separator, the liquid level of the liquid in the separator is in a preset liquid level range, the balance of the water supplementing amount and the liquid consumption can be further controlled, the change rate of the liquid level in the separator is close to zero, namely the liquid level change amount of the liquid in the separator is in a preset deviation range, the liquid level in the separator is stable, and the gas-liquid separation effect of the separator is improved. Different hydrogen production powers of the electrolytic cells correspond to different water supplementing amounts, and in practical application, the water supplementing amount of the water supplementing pump can be obtained through the hydrogen production power of the electrolytic cells, so that the water supplementing pump is controlled to realize fixed-frequency water supplementing according to the water supplementing amount of the water supplementing pump.
As an alternative embodiment, according to the operating state of the water electrolysis hydrogen production system, the continuous water supplementing of the water supplementing pump into the scrubber is controlled, comprising:
when the water electrolysis hydrogen production system is in an unstable power hydrogen production state, the water supplementing pump is controlled to continuously supplement water into the scrubber in a variable frequency water supplementing mode.
When the water electrolysis hydrogen production system is in a stable power hydrogen production state, a starting program can be started for the water electrolysis hydrogen production system, or a stopping program can be started for the water electrolysis hydrogen production system, and at the moment, the power variation of the hydrogen production power of the electrolytic tank is larger than the preset power variation within the preset time period t. Along with the change of hydrogen production power of the electrolytic tank, the liquid consumption is changed, and in order to balance the water supplementing amount and the liquid circulation amount of the water supplementing pump, the water supplementing pump can be controlled to continuously supplement water into the scrubber in a variable-frequency water supplementing mode. When the water supplementing pump adopts variable frequency water supplementing, the working frequency of the water supplementing pump is variable, the water supplementing quantity is variable, and different quantities of liquid are supplemented into the washer, so that the water supplementing quantity is matched with the liquid circulation quantity. If the working state of the water electrolysis hydrogen production system is a starting-up program state, the hydrogen production power of the electrolytic tank is gradually increased, and the water supplementing amount can be gradually increased by utilizing the variable-frequency water supplementing of the water supplementing pump. For example, the working state of the water electrolysis hydrogen production system is a starting and stopping program, the hydrogen production power of the electrolytic tank is gradually reduced, and the water supplementing amount is gradually reduced by utilizing the variable-frequency water supplementing of the water supplementing pump.
In practical application, the method for controlling the water supplementing pump to continuously supplement water into the scrubber in a variable-frequency water supplementing mode can comprise the following steps:
and determining the water supplementing quantity of the water supplementing pump according to the liquid level change rate of the liquid in the separator, and controlling the water supplementing pump according to the water supplementing quantity of the water supplementing pump to realize variable-frequency water supplementing.
Unlike the water electrolysis hydrogen production system in the steady power hydrogen production state, when the water electrolysis hydrogen production system is in the unsteady power hydrogen production state, the hydrogen production power of the electrolytic tank is not maintained near the constant power value, and the hydrogen production power of the electrolytic tank is converted greatly in a period of time. When the hydrogen production power of the electrolytic cell is changed greatly, if the water supplementing amount of the water supplementing pump is fixed, the liquid level change rate of the liquid in the separator is also changed. The water supplementing quantity can be obtained through the calculation of the liquid level change rate of the separator, so that the matching of the water supplementing quantity and the liquid circulation quantity is realized, the change rate of the liquid level in the separator is ensured to be close to zero, and the washing efficiency of the scrubber on gas is improved through continuous and stable water supplementing.
Optionally, when the water electrolysis hydrogen production system is in an unstable power hydrogen production state, controlling the water supplementing pump to continuously supplement water into the scrubber in a variable frequency water supplementing mode, including:
when the water electrolysis hydrogen production system is in an unstable power hydrogen production state and the hydrogen production power of the electrolytic tank is increased, the water supplementing quantity of the water supplementing pump for supplementing water into the scrubber is controlled to be increased, so that the water supplementing quantity of the water supplementing pump is matched with the circulating quantity of liquid flowing into the electrolytic tank.
When the water electrolysis hydrogen production system is in an unstable power hydrogen production state and the hydrogen production power of the electrolytic cell is increased, the water electrolysis hydrogen production system can be in a starting-up program state. In this state, the hydrogen production power of the electrolyzer does not reach the preset power value, and the hydrogen production power of the electrolyzer can reach the preset power value only after a certain period of time. In this state, the amount of liquid consumed by the electrolytic cell is gradually increased, i.e., the amount of liquid circulated into the electrolytic cell is gradually increased. If the water supplementing quantity of the water supplementing pump is unchanged, the liquid level of the liquid in the separator is gradually reduced, at the moment, the water supplementing quantity of the water supplementing pump for supplementing water into the scrubber can be controlled to be increased, the water supplementing pump adopts variable-frequency water supplementing, the water supplementing quantity is adjusted in real time, the water supplementing quantity is matched with the circulating quantity of the liquid flowing into the electrolytic tank, the liquid level change rate of the separator is ensured to be approximately zero, the gas-liquid entrainment phenomenon of the separator is prevented, and the gas cleaning effect of the subsequent scrubber can be improved.
Optionally, when the water electrolysis hydrogen production system is in an unstable power hydrogen production state, controlling the water supplementing pump to continuously supplement water into the scrubber in a variable frequency water supplementing mode, including:
when the water electrolysis hydrogen production system is in an unstable power hydrogen production state and the hydrogen production power of the electrolytic tank is reduced, the water supplementing quantity of the water supplementing pump for supplementing water into the scrubber is controlled to be reduced, so that the water supplementing quantity of the water supplementing pump is matched with the circulating quantity of liquid flowing into the electrolytic tank.
When the water electrolysis hydrogen production system is in an unstable power hydrogen production state and the hydrogen production power of the electrolytic tank is reduced, the water electrolysis hydrogen production system can be in a starting and shutdown program state. In this state, the hydrogen production power of the electrolyzer is gradually reduced from the preset power value to 0, and the electrolyzer is required to be completely stopped after a certain period of time. In this state, the amount of liquid consumed by the electrolytic cell is gradually reduced, i.e., the amount of liquid circulated into the electrolytic cell is gradually reduced. If the water supplementing quantity of the water supplementing pump is unchanged, the liquid level variation of the liquid in the separator is gradually increased, at the moment, the water supplementing quantity of the water supplementing pump for supplementing water into the scrubber can be controlled to be reduced, the water supplementing pump adopts variable-frequency water supplementing, the water supplementing quantity is adjusted in real time, the water supplementing quantity is matched with the liquid circulation quantity flowing into the electrolytic tank, the liquid level variation of the separator is ensured to be approximately zero, the phenomenon that the separator generates gas-liquid entrainment is prevented, and the cleaning effect of the subsequent scrubber on gas can be improved.
In order to further explain the water replenishment control method provided by the invention, as shown in fig. 3, the method comprises the following steps:
step 301: in the process of water electrolysis hydrogen production, the working state of the water electrolysis hydrogen production system is determined.
Step 302: when the water electrolysis hydrogen production system is in an unstable power hydrogen production state and the hydrogen production power of the electrolytic tank is increased, the water supplementing quantity of the water supplementing pump for supplementing water into the scrubber is controlled to be increased, so that the water supplementing quantity of the water supplementing pump is matched with the circulating quantity of liquid flowing into the electrolytic tank.
Step 303: when the water electrolysis hydrogen production system is in a stable power hydrogen production state, the water supplementing pump is controlled to continuously supplement water into the scrubber in a fixed-frequency water supplementing mode.
Step 304: when the water electrolysis hydrogen production system is in an unstable power hydrogen production state and the hydrogen production power of the electrolytic tank is reduced, the water supplementing quantity of the water supplementing pump for supplementing water into the scrubber is controlled to be reduced, so that the water supplementing quantity of the water supplementing pump is matched with the circulating quantity of liquid flowing into the electrolytic tank.
After the water electrolysis hydrogen production system starts a startup procedure, when the hydrogen production power of the electrolytic tank does not reach a preset power value, the hydrogen production power of the electrolytic tank is in a climbing state, namely, the water electrolysis hydrogen production system is in an unstable power hydrogen production state, the hydrogen production power of the electrolytic tank is increased, the water supplementing quantity is required to be continuously increased, the liquid level of the separator can be monitored at the moment, the change condition of the liquid level in the separator is obtained, the water supplementing pump adopts variable-frequency water supplementing, and the water supplementing quantity is increased, so that the liquid level of the liquid in the separator is in a preset liquid level range. The water supplementing pump can be further controlled to supplement water to the scrubber, so that the water supplementing amount of the water supplementing pump is matched with the circulating amount of the liquid flowing into the electrolytic tank, the liquid level change rate of the liquid in the separator is enabled to be zero, and the reduction of the gas separation effect caused by larger fluctuation of the liquid level is avoided.
When the hydrogen production power of the electrolytic tank of the water electrolysis hydrogen production system reaches a preset power value, the water electrolysis hydrogen production system is in a stable power hydrogen production state, the liquid consumption of the electrolytic tank is kept in a stable state, the liquid circulation amount flowing into the electrolytic tank is kept stable, the water supplementing amount of the water supplementing pump is kept stable, the water supplementing pump adopts fixed-frequency water supplementing, the liquid level of the liquid in the separator is in a preset liquid level range, the water supplementing amount of the water supplementing pump can be further determined according to the hydrogen production power of the electrolytic tank, so that the water supplementing amount is matched with the liquid circulation amount, the liquid level in the separator is stable, the liquid level fluctuation is not obvious, and the gas-liquid entrainment caused by the liquid level fluctuation is avoided, and the separation effect of the separator is influenced.
When the water electrolysis hydrogen production system receives a shutdown signal, the water electrolysis hydrogen production system starts a shutdown program, the complete shutdown can be achieved after a period of time, the hydrogen production power of the electrolytic tank is gradually reduced, namely, the water electrolysis hydrogen production system is in an unstable power hydrogen production state, the hydrogen production power of the electrolytic tank is reduced, the water supplementing quantity is required to be continuously reduced, the liquid level of the separator can be monitored at the moment, the change condition of the liquid level in the separator is obtained, the water supplementing pump adopts variable-frequency water supplementing, and the water supplementing quantity is reduced, so that the liquid level of the liquid in the separator is in a preset liquid level range. The water supplementing pump can be further controlled to reduce the water supplementing amount of the water supplementing pump to the washer, so that the water supplementing amount of the water supplementing pump is matched with the circulating amount of the liquid flowing into the electrolytic tank, the liquid level change rate of the liquid in the separator is enabled to be close to zero, and the reduction of the gas separation effect caused by larger fluctuation of the liquid level is avoided. The water supplementing pump can stop the water supplementing operation after the water electrolysis hydrogen production system is completely stopped in the water supplementing state.
The invention can realize continuous water supplementing in the scrubber, can match water supplementing amount in real time for working states of different water electrolysis hydrogen production systems through liquid circulation amount, can improve the washing effect of hydrogen, has low alkalinity of the produced hydrogen, and can reduce the running cost of subsequent hydrogen purification equipment.
The invention also provides a water electrolysis hydrogen production system, which comprises: and the controller and the water supplementing pump.
The water supplementing pump is controlled by the controller.
The controller is configured to execute the water replenishment control method shown in fig. 1 to 3.
Optionally, the water electrolysis hydrogen production system further comprises: a scrubber and a separator.
The liquid supplementing end of the washer is communicated with the water supplementing pump, and the liquid overflowing end of the washer is communicated with the input end of the separator.
Optionally, the water electrolysis hydrogen production system further comprises: an electrolytic cell.
The liquid supplementing end of the electrolytic tank is communicated with the liquid output end of the separator, and the air outlet end of the electrolytic tank is communicated with the air input end of the separator.
Optionally, the water electrolysis hydrogen production system further comprises: and a circulation pump.
The input end of the circulating pump is communicated with the liquid output end of the separator, and the output end of the circulating pump is communicated with the liquid supplementing end of the electrolytic tank.
Optionally, the water electrolysis hydrogen production system further comprises: a heat exchanger.
The input end of the heat exchanger is communicated with the liquid output end of the separator, and the output end of the heat exchanger is communicated with the input end of the circulating pump.
To further illustrate the water electrolysis hydrogen production system provided by the present invention, as shown in fig. 4, the water electrolysis hydrogen production system includes: the device comprises a water supplementing pump 1, an electrolytic tank 2, a hydrogen scrubber 3, an oxygen scrubber 4, a hydrogen separator 5, an oxygen separator 6, a first circulating pump 7, a second circulating pump 8, a heat exchanger 9, a first liquid level meter 10 and a second liquid level meter 11. The controller is connected to the water make-up pump, the controller not being shown in the figures.
The water outlet of the water supplementing pump 1 is respectively communicated with the liquid supplementing end of the hydrogen scrubber 3 and the liquid supplementing end of the oxygen scrubber 4. The overflow end of the hydrogen scrubber 3 is communicated with the liquid input end of the hydrogen separator 5, and the gas output end of the hydrogen separator 5 is communicated with the air inlet end of the hydrogen scrubber 3. The overflow end of the oxygen scrubber 4 is communicated with the liquid input end of the oxygen separator 6, and the gas output end of the oxygen separator 6 is communicated with the air inlet end of the oxygen scrubber 4. Hydrogen is output from the exhaust end of the hydrogen scrubber 3 and oxygen is output from the exhaust end of the oxygen scrubber 4. The first liquid level meter 10 is arranged on the hydrogen separator 5, and the first liquid level meter 10 detects the liquid level of the liquid in the hydrogen separator 5. A second level gauge 11 is arranged on the oxygen separator 6, the second level gauge 11 detecting the level of liquid in the oxygen separator 6. The first liquid level meter 10 is electrically connected with a controller in the water supplementing pump 1. The hydrogen separator 5 is in communication with the oxygen separator 6 to balance the liquid level in the separator. The liquid output end of the hydrogen separator 5 and the liquid output end of the oxygen separator 6 are communicated with the input end of the heat exchanger 9, and the output end of the heat exchanger 9 is respectively communicated with the input end of the first circulating pump 7 and the input end of the second circulating pump 8. The output end of the first circulating pump 7 and the output end of the second circulating pump 8 are both communicated with the liquid supplementing end of the electrolytic tank 2, the hydrogen gas outlet end of the electrolytic tank 2 is communicated with the gas input end of the hydrogen separator 5, and the oxygen gas outlet end of the electrolytic tank 2 is communicated with the gas input end of the oxygen separator 6.
Fresh water is fed into the hydrogen scrubber and the oxygen scrubber through the water supplementing pump, the hydrogen scrubbing operation is completed in the hydrogen scrubber, the oxygen scrubbing operation is completed in the oxygen scrubber, the hydrogen without alkali liquor or with a small amount of alkali liquor is discharged from the hydrogen scrubber, and of course, the oxygen without alkali liquor or with a small amount of alkali liquor is discharged from the oxygen scrubber. After the water washing of the hydrogen and the oxygen is completed in the scrubber, the alkali liquor overflows into the hydrogen separator and the oxygen separator, the alkali liquor in the hydrogen separator and the oxygen separator is cooled by the heat exchanger and then enters the electrolytic tank through the first circulating pump or the second circulating pump, the rotating speeds of the first circulating pump and the second circulating pump can be determined according to the hydrogen production power of the electrolytic tank, and the higher the hydrogen production power of the electrolytic tank is, the higher the rotating speed of the circulating pump is. The liquid injected into the electrolytic tank through the first circulating pump or the second circulating pump can supplement the electrolytic consumption and alkali liquor carried out by gas.
It should be noted that fig. 4 shows two circulation pumps, namely, a first circulation pump and a second circulation pump, and when the water electrolysis hydrogen production system works, the first circulation pump or the second circulation pump can be used for delivering the liquid output by the heat exchanger into the electrolytic tank, and when one circulation pump fails, the other circulation pump can be used for inputting the liquid. In addition, fig. 4 shows that the first liquid level meter 10 is electrically connected with the controller in the water supplementing pump 1, however, the second liquid level meter 11 may also be electrically connected with the controller in the water supplementing pump 1, and the liquid level in the oxygen separator may be monitored at this time.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, article or apparatus that comprises an element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. A water replenishment control method for a water electrolysis hydrogen production system, the method comprising:
in the process of water electrolysis hydrogen production, determining the working state of the water electrolysis hydrogen production system;
and according to the working state of the water electrolysis hydrogen production system, controlling a water supplementing pump to continuously supplement water into the washer, and enabling liquid in the washer to flow into the separator so as to realize that the liquid level of the liquid in the separator is within a preset liquid level range.
2. The water replenishing control method according to claim 1, wherein the controlling the water replenishing pump to continuously replenish water into the scrubber according to the operation state of the water electrolysis hydrogen production system, wherein the liquid in the scrubber flows into the separator, and the liquid level of the liquid in the separator is within a preset liquid level range, comprises:
according to the working state of the water electrolysis hydrogen production system, the water supplementing pump is controlled to continuously supplement water into the washer, so that the water supplementing amount of the water supplementing pump is matched with the liquid circulation amount of the water electrolysis hydrogen production system, and the liquid in the washer flows into the separator, so that the liquid level variation of the liquid in the separator is within a preset deviation range.
3. The water replenishment control method according to claim 1 or 2, wherein the controlling the replenishment pump to continuously replenish water into the scrubber according to the operation state of the water electrolysis hydrogen production system comprises:
when the water electrolysis hydrogen production system is in a stable power hydrogen production state, the water supplementing pump is controlled to continuously supplement water into the scrubber in a fixed-frequency water supplementing mode.
4. The water replenishment control method as set forth in claim 3, wherein said controlling said replenishment pump to continuously replenish water into said scrubber by constant frequency replenishment when said water electrolysis hydrogen production system is in a steady power hydrogen production state comprises:
when the water electrolysis hydrogen production system is in a stable power hydrogen production state, the water supplementing quantity of the water supplementing pump is obtained according to the hydrogen production power of the electrolytic tank in the water electrolysis hydrogen production system, and the water supplementing pump is controlled according to the water supplementing quantity of the water supplementing pump to realize fixed-frequency water supplementing.
5. The water replenishment control method according to claim 1 or 2, wherein the controlling the replenishment pump to continuously replenish water into the scrubber according to the operation state of the water electrolysis hydrogen production system comprises:
when the water electrolysis hydrogen production system is in an unstable power hydrogen production state, the water supplementing pump is controlled to continuously supplement water into the scrubber in a variable frequency water supplementing mode.
6. The water replenishment control method as set forth in claim 5, wherein said controlling said replenishment pump to continuously replenish water into said scrubber by means of variable frequency replenishment when said hydro-electrolytic hydrogen production system is in an unstable power hydrogen production state comprises:
when the water electrolysis hydrogen production system is in an unstable power hydrogen production state and the hydrogen production power of the electrolytic tank is increased, controlling the water supplementing pump to supplement water in the scrubber to increase the water supplementing amount so that the water supplementing amount of the water supplementing pump is matched with the liquid circulation amount flowing into the electrolytic tank.
7. The water replenishment control method as set forth in claim 5, wherein said controlling said replenishment pump to continuously replenish water into said scrubber by means of variable frequency replenishment when said hydro-electrolytic hydrogen production system is in an unstable power hydrogen production state comprises:
when the water electrolysis hydrogen production system is in an unstable power hydrogen production state and the hydrogen production power of the electrolytic tank is reduced, controlling the water supplementing pump to supplement water in the scrubber to reduce the water supplementing amount so that the water supplementing amount of the water supplementing pump is matched with the liquid circulation amount flowing into the electrolytic tank.
8. The water replenishment control method according to claim 5, wherein the controlling the water replenishment pump to continuously replenish water into the scrubber by means of variable frequency water replenishment comprises:
and determining the water supplementing quantity of the water supplementing pump according to the liquid level change rate of the liquid in the separator, and controlling the water supplementing pump to realize variable-frequency water supplementing according to the water supplementing quantity of the water supplementing pump.
9. A water electrolysis hydrogen production system, comprising:
a controller and a water supplementing pump;
the water supplementing pump is controlled by the controller;
the controller is configured to execute the water replenishment control method according to any one of claims 1 to 8.
10. The hydro-electrolytic hydrogen production system of claim 9, further comprising:
a scrubber and a separator;
the liquid supplementing end of the washer is communicated with the water supplementing pump, and the liquid overflowing end of the washer is communicated with the input end of the separator.
11. The water electrolysis hydrogen production system of claim 10, further comprising:
an electrolytic cell;
the liquid supplementing end of the electrolytic tank is communicated with the liquid output end of the separator, and the air outlet end of the electrolytic tank is communicated with the air input end of the separator.
12. The hydro-electrolytic hydrogen production system of claim 11, further comprising:
a circulation pump;
the input end of the circulating pump is communicated with the liquid output end of the separator, and the output end of the circulating pump is communicated with the liquid supplementing end of the electrolytic tank.
13. The water electrolysis hydrogen production system of claim 12, further comprising:
a heat exchanger;
the input end of the heat exchanger is communicated with the liquid output end of the separator, and the output end of the heat exchanger is communicated with the input end of the circulating pump.
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