One-to-many hydrogen production system

Abstract

The utility model discloses a one-to-many hydrogen production system which comprises a plurality of electrolytic cells, hydrogen outlets of the plurality of electrolytic cells are all connected with a gas inlet of a hydrogen-liquid separator, oxygen outlets of the plurality of electrolytic cells are all connected with a gas inlet of an oxygen-liquid separator, and a gas outlet of the hydrogen-liquid separator is connected with a hydrogen rear-end processing unit. A gas outlet of the oxygen-liquid separator is connected with an oxygen rear-end treatment unit, and alkali liquor outlets of the hydrogen-liquid separator and the oxygen-liquid separator are connected with liquid inlets of the alkali liquor heat exchanger and the heating heat exchanger; alkali liquor circulating pumps are arranged on alkali liquor inlets of the plurality of electrolytic baths and are connected with liquor outlets of the alkali liquor heat exchanger and the heating heat exchanger; and an oxygen-in-hydrogen analyzer is also arranged on the oxygen outlet of each electrolytic cell. According to the utility model, the occupied area of equipment is effectively reduced, the overall investment cost of the equipment is reduced, waste heat can be recycled, and the operation is stable.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydrogen production technical field, concretely relates to a one-to-many hydrogen production system. BACKGROUND

[0002] The existing hydrogen production system is one-to-one structure system, that is, one electrolytic cell corresponds to a set of post-processing system, the post-processing system can supply the electrolytic cell with lye for hydrogen production, and can cool, wash and the like to the hydrogen and oxygen generated by the electrolytic cell, so that the hydrogen and oxygen with higher purity are obtained.

[0003] When multiple electrolytic cells are used for hydrogen production, the one-to-one system increases the equipment area and equipment investment cost; and the waste heat generated by the electrolytic cell needs to be taken out by cooling circulating water, and the cooling circulating water is cooled and cooled by the cooling tower or the water chiller, so that the heat is not recycled and the power consumption of the cooling tower or the water chiller is increased;

[0004] When starting, the electrolytic cell needs about 1 hour to reach stable working condition, which not only cannot quickly respond to the change of wind and light power generation load, but also increases the power consumption (most of the power is used to heat the lye in the system) and production waiting time;

[0005] Furthermore, in the existing post-processing system, the hydrogen and oxygen purity analysis sampling point is sampled at the rear end of the hydrogen and oxygen vapor-water separator of the post-processing frame, assuming that the hydrogen purity in the electrolytic cell oxygen does not meet the standard, the entire oxygen side system needs to be filled with non-standard oxygen to reach the hydrogen and oxygen purity analysis sampling point of the post-processing system, so that the data displayed by the oxygen hydrogen analyzer has hysteresis, which is not conducive to the safe and stable operation of the equipment. SUMMARY

[0006] The utility model wants to solve the technical problem to provide a one-to-many hydrogen production system, which effectively reduces the equipment area and the overall equipment investment cost, the waste heat can be recycled and utilized, and the operation is stable.

[0007] In order to solve the above technical problem, the utility model provides a one-to-many hydrogen production system, which comprises multiple electrolytic cells, the hydrogen gas outlet of each electrolytic cell is connected with the gas inlet of a hydrogen gas liquid separator, the oxygen gas outlet of each electrolytic cell is connected with the gas inlet of an oxygen gas liquid separator, the gas outlet of the hydrogen gas liquid separator is connected with a hydrogen rear-end processing unit, the gas outlet of the oxygen gas liquid separator is connected with an oxygen rear-end processing unit, and the lye outlet of the hydrogen gas liquid separator and the oxygen gas liquid separator is connected with the liquid inlet of a lye heat exchanger and a heating heat exchanger.

[0008] A lye circulating pump is arranged on the lye inlet of each electrolytic cell, and the lye circulating pump is connected with the liquid outlet of the lye heat exchanger and the heating heat exchanger.

[0009] The oxygen outlet of each electrolytic cell is further provided with an oxygen hydrogen analyzer.

[0010] Further, the hydrogen outlet of the electrolytic cell is provided with a hydrogen side manual ball valve, and the oxygen outlet of the electrolytic cell is provided with an oxygen side manual ball valve.

[0011] Further, the liquid inlet and the liquid outlet of the lye heat exchanger and the liquid inlet and the liquid outlet of the heating heat exchanger are both provided with first pneumatic ball valves.

[0012] Further, the lye heat exchanger is provided with cooling water inlet and outlet pipelines.

[0013] Further, the heating heat exchanger is provided with a heat exchange inlet pipe and a heat exchange outlet pipe, the heat exchange inlet pipe is connected with a heating water inlet pipe and a hot steam inlet pipe, the heat exchange outlet pipe is connected with a heating water outlet pipe and a hot steam outlet pipe, the heating water inlet pipe, the hot steam inlet pipe, the heating water outlet pipe and the hot steam outlet pipe are all provided with second pneumatic ball valves, and the heat exchange outlet pipe is further provided with a heating water regulating valve.

[0014] Further, the hydrogen rear end processing unit comprises a hydrogen scrubber, a hydrogen cooler and a hydrogen gas-water separator which are sequentially connected, the hydrogen scrubber is arranged on the gas outlet of the hydrogen liquid separator, and a first lye backflow pipeline is further arranged between the hydrogen cooler and the hydrogen liquid separator.

[0015] Further, the oxygen rear end processing unit comprises an oxygen scrubber, an oxygen cooler and an oxygen gas-water separator which are sequentially connected, the oxygen scrubber is arranged on the gas outlet of the oxygen liquid separator, and a second lye backflow pipeline is further arranged between the oxygen cooler and the oxygen liquid separator.

[0016] Further, a lye filter, a lye flow meter and a lye flow regulating valve are sequentially arranged between the lye circulating pump and the corresponding electrolytic cell.

[0017] Further, the oxygen hydrogen analyzer is connected with a small gas-liquid separation tank, and a branch manual ball valve is arranged between the small gas-liquid separation tank and the corresponding oxygen gas outlet.

[0018] Further, the gas outlet ends of the hydrogen rear end processing unit and the oxygen rear end processing unit are both provided with a main regulating valve and an auxiliary regulating valve.

[0019] The utility model discloses the beneficial effect:

[0020] Adopt multiple electrolytic cells simultaneously, process the hydrogen and oxygen prepared by a set of rear processing system to multiple electrolytic cells, can effectively reduce the equipment area and reduce the equipment overall investment cost;

[0021] The heating heat exchanger is installed in the post-processing system, high-temperature lye is heated to heat water through heat exchange of the heating heat exchanger, so that the cooling circulating water cooling power consumption can be reduced in winter, and the high-temperature lye waste heat is utilized;

[0022] The heating heat exchanger can utilize the waste heat of the high-temperature lye and heat the lye, so that the hydrogen production system is in a hot standby state, 3-5 minutes are needed to reach a stable working condition, the wind-solar power generation load change can be quickly responded, and the electric energy consumption is reduced, and the production waiting time is greatly reduced;

[0023] The oxygen-hydrogen analyzer installed on the oxygen side outlet pipeline of the electrolytic cell can avoid the purity hysteresis of hydrogen in oxygen, and improve the stable operation safety of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 It is a whole structure connection schematic diagram of the utility model;

[0025] Fig. 2 It is an electrolytic cell part connection schematic diagram of the utility model;

[0026] Fig. 3 It is a heat exchange part connection schematic diagram of the utility model;

[0027] Fig. 4 It is a hydrogen rear end processing unit connection schematic diagram of the utility model. DETAILED DESCRIPTION

[0028] The utility model will be further explained in combination with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0029] Reference Figs. 1 to 4As shown, the pair-to-many hydrogen production system includes multiple electrolytic cells 1, the hydrogen gas outlets of the multiple electrolytic cells are connected with the gas inlets of hydrogen gas liquid separators 2, the oxygen gas outlets of the multiple electrolytic cells are connected with the gas inlets of oxygen gas liquid separators 3, the gas outlets of the hydrogen gas liquid separators are connected with hydrogen rear-end processing units 4, the gas outlets of the oxygen gas liquid separators are connected with oxygen rear-end processing units 5, the lye outlets of the hydrogen gas liquid separators and the oxygen gas liquid separators are connected with the liquid inlets of lye heat exchangers 6 and heating heat exchangers 7, the lye inlets of the multiple electrolytic cells are each provided with a lye circulating pump 8, the lye circulating pump is connected with the lye outlets of the lye heat exchangers and the heating heat exchangers, the lye circulating pump sends lye into the electrolytic cells, each electrolytic cell is equipped with a lye circulating pump, so that the lye flow rate of each electrolytic cell inlet matches the operation condition of each electrolytic cell when a single or multiple electrolytic cells are put into use, and the operation stability is improved.

[0030] After the electrolytic cells work, hydrogen gas enters the hydrogen gas liquid separators from the hydrogen gas outlets, and oxygen gas enters the oxygen gas liquid separators from the oxygen gas outlets, the lye in the hydrogen gas and the oxygen gas is effectively separated through the cooperation of the hydrogen gas liquid separators and the oxygen gas liquid separators, then washing, cooling and other operations are performed through the hydrogen rear-end processing units and the oxygen rear-end processing units, and finally high-purity hydrogen and oxygen are obtained.

[0031] The hydrogen gas liquid separators and the oxygen gas liquid separators can separate the lye in the hydrogen gas and the oxygen gas respectively, and finally flow into the lye heat exchangers or the heating heat exchangers, and then are sent into the electrolytic cells by the lye circulating pump for circulation after cooling.

[0032] Specifically, the first pneumatic ball valves 12 are arranged on the liquid inlets and the liquid outlets of the lye heat exchangers and the liquid inlets and the liquid outlets of the heating heat exchangers, the first pneumatic ball valves can control the flow direction of the lye, so as to achieve the purpose of cooling in a certain way.

[0033] The lye heat exchangers are provided with cooling water inlet and outlet pipelines, and the lye is cooled by the cooling water.

[0034] The heating heat exchanger is provided with a heat exchange inlet pipe and a heat exchange outlet pipe, the heat exchange inlet pipe is connected with the heating water inlet pipe 13 and the hot steam inlet pipe 14, the heat exchange outlet pipe is connected with the heating water outlet pipe 15 and the hot steam outlet pipe 16, the heating water inlet pipe, the hot steam inlet pipe, the heating water outlet pipe and the hot steam outlet pipe are all provided with a second pneumatic ball valve 17, and the heat exchange outlet pipe is further provided with a heating water regulating valve 18. The heating water can take away the heat in the lye after passing through the heating heat exchanger, so that the waste heat is effectively utilized, and the heating water is heated for heating use; and the hot steam can also enter the heating heat exchanger, and the lye with low temperature can be heat exchanged through the heat of the hot steam, so that the effect of heating the lye is achieved, so that the electrolytic cell can quickly enter the working state.

[0035] The oxygen outlet of each electrolytic cell is further provided with an oxygen hydrogen analyzer 9, the oxygen hydrogen analyzer is connected with a small gas-liquid separation tank, a branch manual ball valve 24 is arranged between the small gas-liquid separation tank and the corresponding oxygen outlet, and the oxygen prepared in the electrolytic cell can enter the small gas-liquid separation tank in the first time by opening the branch manual ball valve, and after gas-liquid separation, the oxygen is directly detected by the oxygen hydrogen analyzer, so that the purity of the oxygen hydrogen analysis is prevented from being delayed, and the safety of stable operation of the equipment is improved.

[0036] The hydrogen rear-end processing unit includes a hydrogen scrubber 19, a hydrogen cooler 20 and a hydrogen gas-water separator 21 connected in sequence, the hydrogen scrubber is arranged on the gas outlet of the hydrogen gas-liquid separator, a first lye reflux pipeline is further arranged between the hydrogen gas-liquid separator and the hydrogen cooler, and the hydrogen gas-liquid separator is repeatedly utilized.

[0037] The oxygen rear-end processing unit includes an oxygen scrubber, an oxygen cooler and an oxygen gas-water separator connected in sequence, the oxygen scrubber is arranged on the gas outlet of the oxygen gas-liquid separator, a second lye reflux pipeline is further arranged between the oxygen gas-liquid separator and the oxygen cooler, and the oxygen gas-liquid separator is repeatedly utilized.

[0038] The main regulating valve 25 and the auxiliary regulating valve 26 are arranged on the gas outlet ends of the hydrogen rear-end processing unit and the oxygen rear-end processing unit, specifically on the gas outlet ends of the hydrogen gas-water separator and the oxygen gas-water separator.

[0039] Based on the above structure, the working process is described in a more detailed manner:

[0040] The hydrogen production system workflow: After the electrolytic cell starts electrolysis, hydrogen gas enters the hydrogen liquid separator through the hydrogen side manual ball valve of the electrolytic cell, and oxygen gas enters the oxygen liquid separator through the oxygen side manual ball valve of the electrolytic cell. In the hydrogen and oxygen gas-liquid separators, the gas and liquid are separated by gravity. The hydrogen gas enters the hydrogen scrubber to wash off the alkali solution contained in the hydrogen gas, and then enters the hydrogen cooler for cooling. The cooled hydrogen gas enters the hydrogen water separator, and the hydrogen water separator removes the trace amount of liquid contained in the hydrogen gas through the defoaming wire mesh. Subsequently, the hydrogen gas enters the downstream process through the main or auxiliary regulating valve on the hydrogen side. The oxygen gas process is the same as that of hydrogen. In a one-to-four hydrogen production system, the load of the four electrolytic cells ranges from 30% to 110%. Therefore, when the load is low, the system liquid level is balanced by the auxiliary regulating valve on the hydrogen side, and the system pressure is balanced by the auxiliary regulating valve on the oxygen side. When the load is high, the system liquid level is balanced by the main regulating valve on the hydrogen side, and the system pressure is balanced by the main regulating valve on the oxygen side. Switching between the main and auxiliary regulating valves makes the system more stable and safe.

[0041] The alkali solution in the hydrogen and oxygen liquid separators enters the alkali heat exchanger or heating heat exchanger through the connecting pipeline at the bottom, and then the alkali solution is supplied into the electrolytic cell by the alkali circulating pump. Specifically, the alkali solution passes through the alkali filter, the alkali flow meter, and the alkali flow regulating valve, and then flows into the electrolytic cell for water electrolysis.

[0042] When the hydrogen production system is in normal production, the alkali temperature needs to be maintained at about 85°C. In conventional design, high-temperature alkali needs to be heat exchanged by the alkali heat exchanger. The cooling water is heated and then returned to the cooling tower or chiller for cooling. Due to the need for heating in the hydrogen production equipment plant in winter in the north, a heating heat exchanger is installed in the hydrogen production system. The heating water is heated to about 70°C by the high-temperature alkali, and the heat of the high-temperature alkali is recycled. This not only reduces the power consumption of the cooling tower (or chiller), but also solves the heating problem of the equipment plant.

[0043] The electricity used in a one-to-many hydrogen production system comes from green electricity generated by wind and solar power. The wind and solar power generation may have peaks and troughs. When the electricity is in the trough, the electrolytic cell load needs to be reduced or even stopped. When the electrolytic cell is stopped, in order to quickly respond when the electricity is in the peak, the hydrogen production system needs to be in a hot standby state, that is, the alkali temperature is maintained at about 50°C. Through testing, the electrolytic cell can work at full load in about 3-5 minutes when it is in a hot standby state. If the electrolytic cell is in a cold start state, it takes about 1 hour to reach the rated working condition. Therefore, when the electrolytic cell is in a hot standby state, hot steam enters the heating heat exchanger to maintain the alkali temperature in the system to about 50°C.

[0044] The electrolytic tank needs to match different alkali liquid circulation flow under different working loads, because the alkali liquid circulation flow influences the electrolytic tank temperature control and electrolytic tank energy consumption, and the corresponding alkali liquid circulation flow of each electrolytic tank needs to be adjusted in time according to the electric quantity load. The alkali liquid circulation pump adopts a frequency conversion pump, the flow is precisely controlled through adjusting the frequency conversion pump frequency and the alkali liquid flow regulating valve, the alkali liquid circulation flow outputs a 4-20mA electric signal feedback to the electric control logic to realize the precise control of the alkali liquid circulation flow. The alkali liquid pipeline of each electrolytic tank corresponds to an alkali liquid circulation pump, an alkali liquid flow meter and an alkali liquid flow regulating valve, and four electrolytic tanks can be simultaneously adjusted.

[0045] The multi-to-one hydrogen production system has a large hydrogen and oxygen separator volume, and the hydrogen and oxygen analyzer sampling position is behind the hydrogen and oxygen gas-liquid separator, so that the hydrogen and oxygen purity analysis lag time is too long, thereby increasing the safety hidden danger of the hydrogen production system. An oxygen and hydrogen analyzer and a gas-liquid separation integrated system are installed at the outlet of the oxygen side of each electrolytic tank, so that the hydrogen content in the oxygen under different working loads of the electrolytic tank can be monitored in time, and the system is stopped when the hydrogen in the oxygen reaches the interlocking value, thereby increasing the safety of the hydrogen production system.

[0046] The above examples are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. The equivalent substitutions or transformations of the present application made by the person skilled in the art on the basis of the present application are all within the protection scope of the present application.

Claims

1. A one-to-many hydrogen production system, comprising: The electrolytic tank includes a plurality of electrolytic tanks, the hydrogen gas outlet of each of the plurality of electrolytic tanks is connected with the gas inlet of a hydrogen gas liquid separator, the oxygen gas outlet of each of the plurality of electrolytic tanks is connected with the gas inlet of an oxygen gas liquid separator, the gas outlet of the hydrogen gas liquid separator is connected with a hydrogen rear-end processing unit, the gas outlet of the oxygen gas liquid separator is connected with an oxygen rear-end processing unit, the alkali liquid outlet of the hydrogen gas liquid separator and the oxygen gas liquid separator is connected with the liquid inlet of an alkali liquid heat exchanger and a heating heat exchanger; The alkali liquid inlet of each of the electrolytic tanks is provided with an alkali liquid circulating pump, and the alkali liquid circulating pump is connected with the liquid outlet of the alkali liquid heat exchanger and the heating heat exchanger. The oxygen gas outlet of each of the electrolytic tanks is further provided with an oxygen hydrogen analyzer.

2. The one-to-many hydrogen generation system of claim 1, wherein, The hydrogen gas outlet of each of the electrolytic tanks is provided with a hydrogen side manual ball valve, and the oxygen gas outlet of each of the electrolytic tanks is provided with an oxygen side manual ball valve.

3. The one-to-many hydrogen generation system of claim 1, wherein, The liquid inlet and the liquid outlet of the alkali liquid heat exchanger and the liquid inlet and the liquid outlet of the heating heat exchanger are each provided with a first pneumatic ball valve.

4. The one-to-many hydrogen generation system of claim 1, wherein, The alkali liquid heat exchanger is provided with a cooling water inlet and outlet pipeline.

5. The one-to-many hydrogen generation system of claim 1, wherein, The heating heat exchanger is provided with a heat exchange inlet pipe and a heat exchange outlet pipe, the heat exchange inlet pipe is connected with a heating water inlet pipe and a hot steam inlet pipe, the heat exchange outlet pipe is connected with a heating water outlet pipe and a hot steam outlet pipe, the heating water inlet pipe, the hot steam inlet pipe, the heating water outlet pipe and the hot steam outlet pipe are each provided with a second pneumatic ball valve, and the heat exchange outlet pipe is further provided with a heating water regulating valve.

6. The one-to-many hydrogen generation system of claim 1, wherein, The hydrogen rear-end processing unit includes a hydrogen scrubber, a hydrogen cooler and a hydrogen steam-water separator connected in sequence, the hydrogen scrubber is arranged on the gas outlet of the hydrogen gas liquid separator, and a first alkali liquid return pipeline is further arranged between the hydrogen gas liquid separator and the hydrogen cooler.

7. The one-to-many hydrogen generation system of claim 1, wherein, The oxygen rear-end processing unit includes an oxygen scrubber, an oxygen cooler and an oxygen steam-water separator connected in sequence, the oxygen scrubber is arranged on the gas outlet of the oxygen gas liquid separator, and a second alkali liquid return pipeline is further arranged between the oxygen gas liquid separator and the oxygen cooler.

8. The one-to-many hydrogen generation system of claim 1, wherein, An alkali liquid filter, an alkali liquid flow meter and an alkali liquid flow regulating valve are arranged in sequence between the alkali liquid circulating pump and the corresponding electrolytic tank.

9. The one-to-many hydrogen generation system of claim 1, wherein, The oxygen hydrogen analyzer is connected with a small gas-liquid separation tank, and a branch manual ball valve is arranged between the small gas-liquid separation tank and the corresponding oxygen gas outlet.

10. The one-to-many hydrogen generation system of claim 1, wherein, The gas outlet end of each of the hydrogen rear-end processing unit and the oxygen rear-end processing unit is provided with a main regulating valve and a secondary regulating valve.

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