Single electrolytic bath oxygen sampling analysis unit and multiple alkaline water electrolysis hydrogen production systems

Abstract

The utility model belongs to an alkaline water electrolysis hydrogen production technology, and relates to an oxygen sampling and analyzing unit of a single electrolytic bath, which comprises a sampling separator, a stop valve, a pneumatic valve, a pressure reducing valve and an analyzer, the utility model further relates to a multi-set alkaline water electrolysis hydrogen production system which comprises a plurality of electrolytic cells, an oxygen separator and a single electrolytic cell oxygen sampling and analyzing unit, and an oxygen and alkaline liquor outlet of each electrolytic cell is connected to the oxygen separator through an oxygen and alkaline liquor outlet pipeline connected with a ball valve. Each oxygen alkali liquor outlet pipeline is connected to a main pipeline through a branch pipeline connected with a stop valve, and the main pipeline is connected with a sampling separator in a single electrolytic bath oxygen sampling analysis unit. According to the utility model, independent gas-liquid separation and sampling analysis are carried out at the oxygen alkali liquor outlet of each electrolytic cell, so that the oxygen purity of a single electrolytic cell can be sampled and analyzed, the separated alkali liquor still flows back into the system, the later maintenance is facilitated, and meanwhile, the device has the advantages of high integration level and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of alkali water electrolysis hydrogen production technology, and relates to a multi-set alkali water electrolysis hydrogen production system, in particular to a single electrolytic cell oxygen sampling analysis unit and a multi-set alkali water electrolysis hydrogen production system. BACKGROUND

[0002] In China, the demonstration projects of large-scale hydrogen production stations with wind-solar complementary power are increasing, and the achievements are remarkable.

[0003] With the increasing demand for alkali water electrolysis hydrogen production devices, a large project often needs to match multiple sets of hydrogen production equipment and hydrogen purification equipment, which significantly increases the situation of meeting project requirements while putting forward higher requirements for the reliability of the control system, project cost control, single set-multiple set linkage matching, equipment operation and maintenance, etc.

[0004] At present, in the conventional alkali water electrolysis hydrogen production system, the oxygen sampling and analysis system adopts oxygen sampling and analysis in the gas-liquid separation frame. This case generally belongs to a single electrolytic cell corresponding to a single set of gas-liquid separation frame. With the emergence of multi-set alkali water electrolysis hydrogen production systems, multiple electrolytic cells correspond to a single set of gas-liquid separation frame. The conventional oxygen sampling in the gas-liquid separation frame cannot meet the analysis requirements of oxygen.

[0005] If the conventional oxygen sampling scheme is used in the multi-set alkali water electrolysis hydrogen production system, there are the following problems:

[0006] 1. With the increase in the number of electrolytic cells of the equipment, the operation of each single electrolytic cell is different, the load conditions are different, and the internal electrode diaphragm usage is also different;

[0007] 2. In the hydrogen production system with multiple sets of equipment running simultaneously, when a single electrolytic cell has a diaphragm damage problem leading to unqualified gas purity, it is difficult to determine which electrolytic cell has the problem, and when a certain electrolytic cell has a problem, it cannot be timely feedback and solved;

[0008] 3. The reduction of oxygen purity of a single electrolytic cell cannot be directly displayed on the oxygen sampling and analysis instrument after a single set of gas-liquid separation frame, and the more the number of electrolytic cells, the less obvious it is, which may cause the problem electrolytic cell to continue running and bring huge safety risks;

[0009] 4. In the hydrogen production system with multiple sets of equipment running simultaneously, the load of a single electrolytic cell needs to be adjusted constantly to meet the requirements of system operation, but the purity of oxygen produced by the electrolytic cell will change with the change of load, and it is difficult to determine the oxygen purity of each electrolytic cell under different loads when the overall system is adjusted.

[0010] Therefore, it is necessary to provide a system for directly separating and sampling oxygen outlet of a single electrolytic cell. SUMMARY

[0011] The utility model discloses a single electrolytic cell oxygen sampling analysis unit and multiple sets of alkali water electrolysis hydrogen production system which can independently determine the operation condition of a single electrolytic cell, better meet the overall control requirement, improve system safety and facilitate later maintenance.

[0012] The utility model solves its technical problem and is implemented by the following technical scheme:

[0013] Single electrolytic cell oxygen sampling analysis unit, characterized by: including sampling separator, stop valve, pneumatic valve, pressure reducing valve and analyzer, the one side of sampling separator is equipped with separation inlet, the other side of sampling separator is equipped with two separation outlets arranged longitudinally, the pipeline of installing stop valve is connected at separation inlet and separation outlet, the top of sampling separator is equipped with gas cooling device, the pipeline of installing pneumatic valve and pressure reducing valve is connected to analyzer through the gas outlet of gas cooling device.

[0014] Moreover, the sampling separator includes a cylinder, an upper head, a gas outlet cooling device, a gas outlet drip catcher, a gas outlet anti-vortex device, a gas outlet distribution plate, an inlet distribution pipe, a gas return interface and an alkali solution return pipe, the upper head is arranged on the top of the cylinder, the gas outlet drip catcher is inserted in the middle of the upper head, the gas outlet cooling device is connected to the top of the gas outlet drip catcher through a flange, the gas outlet anti-vortex device is connected to the bottom of the gas outlet drip catcher, the gas outlet distribution plate is arranged above the inside of the cylinder, the inlet distribution pipe is arranged below the gas outlet distribution plate and extends into the cylinder from the lateral wall of the cylinder, the inlet of oxygen and alkali solution is formed by the pipe opening of the inlet distribution pipe outside the cylinder, the alkali solution return pipe is arranged below the inlet distribution pipe and extends into the cylinder from the lateral wall of the cylinder, and the gas return interface is arranged on the lateral wall of the cylinder.

[0015] Moreover, a bracket is arranged on the bottom of the gas outlet anti-vortex device, and the bracket is welded on the lateral wall of the cylinder.

[0016] Moreover, the gas outlet cooling device includes an outlet pipe and a cooling pipe, the outlet pipe is connected to the gas outlet anti-vortex device through a flange, the cooling pipe is arranged outside the outlet pipe, the cooling water inlet and the cooling water outlet are arranged on the cooling pipe, the bottom pipe opening of the outlet pipe forms the inlet pipe opening, and the top pipe opening of the outlet pipe forms the gas outlet.

[0017] Moreover, the edge of the gas outlet distribution plate is spaced apart from the inner wall of the cylinder and is welded.

[0018] The multi-set alkali water electrolysis hydrogen production system is characterized in that it comprises a plurality of electrolytic cells, an oxygen separator, and a single-electrolytic-cell oxygen sampling and analyzing unit, the oxygen alkali liquid outlet pipelines connected to the oxygen separator through the connecting ball valves are connected to the total pipeline at the oxygen alkali liquid outlets of the electrolytic cells, branch pipelines connected to the total pipeline through the connecting stop valves are connected to the sampling separators in the single-electrolytic-cell oxygen sampling and analyzing unit.

[0019] Furthermore, the sampling separators in the single-electrolytic-cell oxygen sampling and analyzing unit are installed higher than the upper end surfaces of the electrolytic cells and the oxygen separator.

[0020] The single-electrolytic-cell oxygen sampling and analyzing unit and the multi-set alkali water electrolysis hydrogen production system have the advantages and positive effects that:

[0021] The single-electrolytic-cell oxygen sampling and analyzing unit and the multi-set alkali water electrolysis hydrogen production system can separately perform gas-liquid separation and sampling analysis at the oxygen alkali liquid outlets of the electrolytic cells, can sample and analyze the oxygen purity of a single electrolytic cell, can still return the separated alkali liquid to the system, are convenient for later maintenance, and have the advantages of high integration degree and the like. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a structural schematic view of the multi-set alkali water electrolysis hydrogen production system of the utility model;

[0023] Figure 2 FIG. 4 is a structural schematic view of the sampling separator of the utility model.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1-electrolytic cell, 2-single-electrolytic-cell oxygen sampling and analyzing unit, 3-sampling separator, 4-pneumatic valve, 5-pressure reducing valve, 6-analyzer, 7-oxygen separator, 8-ball valve, 9-branch pipeline, 10-stop valve, 11-gas outlet pipe, 12-cooling water outlet, 13-cooling pipe, 14-cooling water inlet, 15-flange, 16-gas outlet drop-catching device, 17-gas outlet anti-vortex device, 18-bracket, 19-gas outlet distribution plate, 20-gas backflow interface, 21-ear, 22-alkali liquid backflow pipe, 23-inlet distribution pipe, 24-cylinder, 25-upper end cover. DETAILED DESCRIPTION

[0026] The embodiments of the utility model are further described in detail below in combination with the drawings:

[0027] Hydrogen is a flammable and explosive substance, and the explosion-proof level of hydrogen station is IIC. In the conventional alkali water electrolysis hydrogen production control system, oxygen sampling analysis is generally carried out after the oxygen separator in the gas-liquid separation framework, and the purity of oxygen in the alkali water hydrogen production system is lower than that of hydrogen, and oxygen will reach the explosion limit first, so the detection of oxygen purity is particularly important. With the rapid development of renewable energy, especially the rapid development of hydrogen energy, the simultaneous application of multiple sets of alkali water electrolysis hydrogen production systems has become the main development direction of future alkali water electrolysis hydrogen production equipment. Multiple sets of alkali water electrolysis hydrogen production systems belong to multiple electrolytic cells corresponding to a single gas-liquid separation framework, and if oxygen sampling analysis is still carried out in the gas-liquid separation framework, the oxygen purity of a single electrolytic cell cannot be judged.

[0028] Under this premise, the utility model provides a single electrolytic cell oxygen sampling analysis unit and a multiple sets of alkali water electrolysis hydrogen production system, which can directly sample and analyze the oxygen purity of a single electrolytic cell, directly clarify the operation of each electrolytic cell, facilitate the overall control of multiple sets of hydrogen production systems to confirm the start-stop or cut-off operation of each electrolytic cell, greatly improve the safety of overall operation, and the sampling and analysis system is also convenient for later maintenance, and has the advantages of high integration and the like.

[0029] The single electrolytic cell oxygen sampling analysis unit has the following innovations: it comprises a sampling separator 3, a stop valve 10, a pneumatic valve 4, a pressure reducing valve 5 and an analyzer 6, a separation inlet is arranged on one side of the sampling separator, two separation outlets are arranged on the other side of the sampling separator in a longitudinal direction, a main pipeline is connected to the separation inlet, a pipeline with the stop valve is connected to the two separation outlets, a gas cooling device is arranged on the top of the sampling separator, and the pipeline with the pneumatic valve and the pressure reducing valve is connected to the analyzer through the gas outlet of the gas cooling device. The utility model separates oxygen and alkali liquid in the electrolytic cell oxygen alkali liquid outlet, and recycles the alkali liquid into the system and samples the oxygen into the analyzer. The utility model has the functions of alkali liquid recycling and gas sampling, can sample and analyze oxygen without discharging alkali liquid, enhances environmental protection and improves equipment safety.

[0030] The sampling separator comprises a cylinder 24, an upper head 25, a gas outlet cooling device, a gas outlet droplet catching device 16, a gas outlet anti-vortex device 17, a gas outlet distribution plate 19, an inlet distribution pipe 23, a gas backflow interface 20 and an alkali backflow pipe 22, the upper head is arranged at the top of the cylinder, the gas outlet droplet catching device is inserted in the middle of the upper head, the gas outlet cooling device is connected to the top of the gas outlet droplet catching device through a flange 15, the gas outlet anti-vortex device is connected to the bottom of the gas outlet droplet catching device, the gas outlet distribution plate is arranged inside the cylinder, the inlet distribution pipe is arranged below the gas outlet distribution plate and extends into the cylinder from the lateral wall of the cylinder, the inlet of the oxygen-alkali solution is formed by the pipe opening of the inlet distribution pipe outside the cylinder, the alkali backflow pipe is arranged below the inlet distribution pipe and extends into the cylinder from the lateral wall of the cylinder, the end of the alkali backflow pipe extending into the cylinder is in a downward bending structure, which can generate a liquid seal effect to prevent the gas in the sampling separator from entering through the alkali backflow pipe opening, and the gas backflow interface is arranged on the lateral wall of the cylinder.

[0031] The bracket 18 is arranged at the bottom of the gas outlet anti-vortex device and is welded to the lateral wall of the cylinder.

[0032] The gas outlet cooling device comprises an outlet pipe 11 and a cooling pipe 13, the outlet pipe is connected to the gas outlet anti-vortex device through a flange, the cooling pipe is arranged outside the outlet pipe, the cooling water inlet 14 and the cooling water outlet 12 are arranged on the cooling pipe, the bottom opening of the outlet pipe forms the inlet pipe opening, and the top opening of the outlet pipe forms the gas outlet.

[0033] The edge of the gas outlet distribution plate is spacedly welded to the inner wall of the cylinder to make the backflow liquid flow down along the inner wall of the cylinder.

[0034] The inlet distribution pipe is arranged in the sampling separator to distribute the alkali solution and the oxygen, thereby improving the gas-liquid separation efficiency, the gas outlet distribution plate is arranged to further separate the liquid mixed in the gas, the gas outlet anti-vortex device is additionally arranged at the outlet to prevent the vortex of the gas from carrying away the separated water, thereby improving the gas-liquid separation effect, the free water in the gas is captured through the gas outlet droplet catching device, the gas is cooled through the gas outlet cooling device to meet the temperature requirement of the analysis sampling, the content of the water mixed in the gas is further reduced, the condensed liquid after cooling can flow back into the sampling separator to reduce the loss of the liquid and increase the convenience of recovery, the overall sampling separator has better separation effect, multiple functions and simpler installation and lower cost.

[0035] The utility model discloses still provide a kind of multiple sets of caustic water electrolysis hydrogen production system, its innovative point is at: including several electrolytic cells 1, oxygen separator 7 and single electrolytic cell oxygen sampling analysis unit 2, at each electrolytic cell oxygen caustic liquor outlet place, all be connected to oxygen separator through the oxygen caustic liquor outlet pipeline of connecting ball valve 8, at each oxygen caustic liquor outlet pipeline place, all be connected to main pipeline on branch pipeline 9 of connecting stop valve, the main pipeline is connected with the sampling separator separation inlet in single electrolytic cell oxygen sampling analysis unit.

[0036] Sampling separator installation needs to pay attention to height, need to be installed to gas-liquid separation frame, and sampling separator bottom needs to be higher than oxygen separator barrel and electrolytic cell pole plate highest place;Or install on electrolytic cell oxygen caustic liquor outlet pipeline above, but still need to make sampling separator bottom higher than oxygen separator barrel and electrolytic cell pole plate highest place. Like this can guarantee the reflux of caustic liquor.

[0037] As Figure 1 As shown in the embodiment, the electrolytic cell shown is two, when working, total pipeline on sampling separator is connected to two electrolytic cell oxygen caustic liquor outlets through two branch pipelines of setting stop valve, can realize the sampling analysis of each electrolytic cell by the switch of stop valve. Meanwhile, caustic liquor after separation can be recycled to system, and excess oxygen continues to be recycled to system.

[0038] When system is normally operated, each operating valve (stop valve, pneumatic valve, pressure reducing valve, ball valve) in single electrolytic cell oxygen sampling analysis unit needs to be opened, and is adjusted to required switch position during debugging. Most oxygen after sampling in the utility model can enter the oxygen separator in the gas-liquid separation frame to achieve gas recovery effect.

[0039] The utility model can effectively solve the hidden trouble caused by unstable operation of single electrolytic cell equipment when multiple sets of caustic water electrolysis hydrogen production system are simultaneously operated, and there is no excess liquid or exhaust gas, and all are recycled to original system.

[0040] Although the embodiments and drawings of the utility model are disclosed for the purpose of illustration, those skilled in the art can understand that: various alternatives, changes and modifications are possible without departing from the spirit and scope of the utility model and the appended claims, therefore, the scope of the utility model is not limited to the content disclosed in the embodiments and drawings.

Claims

1. A single cell oxygen sampling and analysis unit, characterized by: The sampling separator, stop valve, pneumatic valve, pressure reducing valve and analyzer are connected by pipes, and the sampling separator is provided with a separation inlet on one side and two longitudinal separation outlets on the other side.

2. A single cell oxygen sampling and analysis unit according to claim 1 characterised in that: The sampling separator comprises a cylinder, an upper head, a gas outlet cooling device, a gas outlet drip catcher, a gas outlet anti-vortex device, a gas outlet distribution plate, an inlet distribution pipe, a gas return interface and an alkali return pipe.

3. A single cell oxygen sampling and analysis unit according to claim 2, characterised in that: The gas outlet anti-vortex device is provided with a bracket welded on the side wall of the cylinder.

4. A single cell oxygen sampling and analysis unit according to claim 2, characterised in that: The gas outlet cooling device comprises a gas outlet pipe and a cooling pipe, the gas outlet pipe is connected to the gas outlet anti-vortex device through a flange, the cooling pipe is arranged outside the gas outlet pipe, the cooling pipe is provided with a cooling water inlet and a cooling water outlet, the bottom of the gas outlet pipe is provided with a gas inlet pipe, and the top of the gas outlet pipe is provided with a gas outlet.

5. The single cell oxygen sampling and analysis unit of claim 2, wherein: The edge of the gas outlet distribution plate is spaced apart from the inner wall of the cylinder and is welded.

6. A plurality of alkaline water electrolysis hydrogen production systems, characterized in that: The oxygen separator is connected to the oxygen alkali outlets of the electrolytic cells through oxygen alkali outlet pipes connected with ball valves, and the oxygen alkali outlet pipes are connected to a total pipe through branch pipes connected with stop valves.

7. The multi-train alkaline water electrolysis hydrogen production system of claim 6, wherein: The sampling separators in the single electrolytic cell oxygen sampling and analyzing unit are higher than the upper end surfaces of the electrolytic cells and the oxygen separator.

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