Energy-saving hydrogen production equipment by electrolysis of water

Abstract

An energy-saving water electrolysis hydrogen production equipment, comprising: a water electrolysis device, a front-end deoxygenation assembly, a first adsorption tower, a second adsorption tower, a hot blowing device, and a rear-end gas-liquid separator; the water electrolysis device is provided with a hydrogen pipeline and an oxygen pipeline; the hot blowing device comprises an oxygen absorption heater and an electric heater, the oxygen absorption heater comprises a filler layer and a shell passage, and the filler layer is filled in the shell passage; oxygen in the oxygen pipeline is introduced into the filler layer, an oxidation reaction is carried out to increase the temperature of hydrogen, and the adsorption tower is subjected to hot blowing, so that the energy efficiency of the water electrolysis hydrogen production system is effectively improved. At the same time, the oxygen absorption reactor can be regenerated by reduction using hydrogen, and the internal filler does not need to be replaced, thereby saving maintenance cost.

Description

[0001] This application claims priority to Chinese Patent Application No. 202411356719.9, filed on September 27, 2024, entitled "An Energy-Saving Electrolytic Water Hydrogen Production Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This utility model belongs to the technical field of hydrogen production equipment, specifically relating to an energy-saving water electrolysis hydrogen production equipment. Background Technology

[0003] Conventional water electrolysis hydrogen production equipment consists of an electrolyzer, a gas-liquid separation device, and a purification device. Purification mostly uses adsorption-regeneration to remove water, and the regeneration process is achieved by electric heating. For example, the invention with application number 202310969931.1 provides a three-tower non-destructive gas drying system, in which an electric heater is set at the front end of each adsorption tower, which results in a large investment in the entire drying system and a large power consumption. Another example is the utility model with application number 202221609938.X, which provides an electrolysis water purification device. The purification device has three drying towers connected in parallel and a single electric heater is set to heat the regeneration gas. Heating is only done by a single electric heater, which results in a large power requirement for the electric heater and a large power consumption of the system. The shortcomings of most water electrolysis hydrogen production devices are: (1) heating the gas only by a heating device, which requires a large amount of energy; (2) water electrolysis hydrogen production devices only use hydrogen products and vent the oxygen products, resulting in a large waste of resources. Utility Model Content

[0004] To address the above shortcomings, the technical problem to be solved by this utility model is to provide an energy-saving water electrolysis hydrogen production device that recovers and reuses the oxygen generated by electrolysis, reduces the energy consumption of the water electrolysis hydrogen production device, and eliminates the need to replace the internal packing material, thus saving maintenance costs.

[0005] To solve the above technical problems, the technical solution adopted by this utility model is as follows: An energy-saving water electrolysis hydrogen production device, characterized in that it comprises: a water electrolysis unit, a front-end deoxygenation component, a first adsorption tower, a second adsorption tower, a hot blowing device, and a rear-end gas-liquid separator; The water electrolysis unit is equipped with hydrogen and oxygen pipelines; The front-end deoxygenation component is connected to the hydrogen pipeline at its front end and to the product gas outlet at its rear end through parallel pipeline one and pipeline two. Parallel pipeline one is equipped with valve B, the first adsorption tower and valve O in sequence, and parallel pipeline two is equipped with valve C, the second adsorption tower and valve P in sequence. The hot blowing device includes an oxygen heater and an electric heater. The oxygen heater includes a packing layer and a shell side. The packing layer fills the shell side. The inlet of the shell side is connected to a pipeline equipped with valve J. The outlet of the packing layer is connected to a pipeline equipped with valve I. The pipeline equipped with valve J and the pipeline equipped with valve I are connected to the rear end of the front deoxygenation component through a pipeline equipped with valve A. The outlet of the shell side and one inlet of the packing layer are connected to one end of the electric heater through pipelines equipped with valve K and valve L, respectively. The other inlet of the packing layer is connected to an oxygen pipeline through an oxygen return pipe. The other end of the electric heater is connected to the pipeline between the first adsorption tower and valve O through a pipeline equipped with valve M, and to the pipeline between the second adsorption tower and valve P through a pipeline equipped with valve N. The back-end gas-liquid separator has its front end connected to the back-end cooler. The front end of the back-end cooler is connected to the outlet of the packing layer via a pipeline equipped with valve F, a pipeline equipped with valve G connected to the pipeline between valve B and the first adsorption tower, and a pipeline equipped with valve H connected to the pipeline between valve C and the second adsorption tower. The back end of the back-end gas-liquid separator is connected to the pipeline between valve B and the first adsorption tower via a pipeline equipped with valve D, and a pipeline equipped with valve E connected to the pipeline between valve C and the second adsorption tower. In the pipeline between valve B and the first adsorption tower, the connection point of the valve D pipeline is between the connection point of the valve B and the valve G pipeline. In the pipeline between valve C and the second adsorption tower, the connection point of the valve E pipeline is between the connection point of the valve C and the valve H pipeline.

[0006] As a preferred embodiment of this utility model, the filler in the filler layer is a regenerable adsorption filler that can release heat through oxidation.

[0007] As a preferred embodiment of this utility model, the filler in the filler layer is iron oxide.

[0008] As a preferred embodiment of this utility model, the oxygen reuse pipe is provided with an oxygen reuse regulating valve, and a first temperature sensor is installed on the shell side, the first temperature sensor being electrically connected to the oxygen reuse regulating valve.

[0009] As a preferred embodiment of this utility model, a second temperature sensor is provided at the other end of the electric heater, and the second temperature sensor is connected to the electric heater.

[0010] As a preferred embodiment of the present invention, the front-end deoxygenation component includes a deoxygenation tower, a front-end cooler, and a front-end gas-liquid separator. The deoxygenation tower is connected to a hydrogen pipeline, the deoxygenation tower is connected to the front-end gas-liquid separator through the front-end cooler, and the front-end gas-liquid separator is connected to a first adsorption tower and / or a second adsorption tower.

[0011] As a preferred embodiment of this utility model, the hydrogen pipeline is equipped with a three-way valve and a hydrogen oxygen analyzer, and an exhaust port is connected to one side of the three-way valve. The deoxygenation tower is connected to the hydrogen pipeline through the three-way valve.

[0012] As a preferred embodiment of this utility model, the water electrolysis device includes an electrolytic cell, an oxygen gas-liquid separator, a hydrogen gas-liquid separator, an oxygen scrubber, and a hydrogen scrubber. The oxygen gas-liquid separator and the oxygen scrubber are respectively installed on the oxygen pipeline, and the hydrogen gas-liquid separator and the hydrogen scrubber are respectively installed on the hydrogen pipeline. The oxygen scrubber and the hydrogen scrubber are respectively connected to the demineralized water inlet. Both the oxygen gas-liquid separator and the hydrogen gas-liquid separator are equipped with a return water pipe, which is connected to the electrolytic cell.

[0013] As a preferred embodiment of this utility model, an oxygen discharge port is provided at the end of the oxygen pipeline, and an oxygen discharge regulating valve is provided near the oxygen discharge port.

[0014] As a preferred embodiment of this utility model, valves A to P are all pneumatic valves.

[0015] The beneficial effects of this invention are that the device recovers and reuses vented oxygen through a hot blowing device, uses an oxidation reaction to increase the temperature of hydrogen, and hot-blown the adsorption tower, effectively improving the energy efficiency of the water electrolysis hydrogen production system. Simultaneously, the oxygen absorption reactor can be regenerated using hydrogen, eliminating the need to replace the internal packing material and saving maintenance costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a water electrolysis hydrogen production equipment.

[0017] Figure reference numerals: Electrolyzer 1; Oxygen gas-liquid separator 2; Hydrogen gas-liquid separator 3; Demineralized water inlet 4; Oxygen scrubber 5; Hydrogen scrubber 6; Oxygen outlet 7; Oxygen outlet regulating valve 8; Hydrogen oxygen analyzer 9; Hydrogen oxygen analyzer root valve 10; Three-way valve 11; Outlet 12; Deoxygenation tower 13; Front-end cooler 14; Front-end gas-liquid separator 15; Pneumatic valve A 16; Pneumatic valve B 17; Pneumatic valve C 18; Pneumatic valve D 19; Pneumatic valve E 20; Rear-end gas-liquid separator 21; Rear-end cooler 22; Pneumatic valve F 23; Pneumatic valve G 24; Pneumatic valve H 25 First adsorption tower 26; Second adsorption tower 27; Pneumatic valve I28; Oxygen heater 29; Packing layer 29-1; Shell side 29-2; Pneumatic valve J30; First temperature sensor 31; Flow sensor 32; Oxygen recycling regulating valve 33; Pneumatic valve K35; Pneumatic valve L34; Electric heater 36; Pneumatic valve M37; Pneumatic valve N38; Pneumatic valve O39; Pneumatic valve P40; Pneumatic valve Q41; Product gas outlet 42; Liquid level sensor 43; Pneumatic drain valve 44; Second temperature sensor 45; Hydrogen pipeline 46; Oxygen pipeline 47; Oxygen recycling pipeline 48. Detailed Implementation

[0018] The present invention will now be further described with reference to the accompanying drawings.

[0019] An energy-saving water electrolysis hydrogen production device includes a water electrolysis unit, a front-end deoxygenation component, a first adsorption tower 26, a second adsorption tower 27, a hot blowing device, and a rear-end gas-liquid separator 21. The water electrolysis unit is equipped with a hydrogen pipeline 46 and an oxygen pipeline 47. The oxygen produced by electrolysis flows into the oxygen pipeline 47, and the hydrogen produced by electrolysis flows into the hydrogen pipeline 46. The front-end deoxygenation component is connected to the hydrogen pipeline 46 and is used to remove oxygen from the hydrogen. The first adsorption tower 26 and the second adsorption tower 27 are alternately connected to the front-end deoxygenation component. The hydrogen treated by the front-end deoxygenation component is dehydrated through the first adsorption tower 26 and / or the second adsorption tower 27 to produce hydrogen product. The hot blowing device is connected at the front end to the front-end deoxygenation component and at the rear end to the first adsorption tower 26 and / or the second adsorption tower 27. Alternatively, the first adsorption tower 26 can be connected to the second adsorption tower 27. When the first adsorption tower 26 is connected to the front-end deoxygenation component, the hot blowing device is connected to the second adsorption tower 27 to perform hot blowing dehydration treatment on the second adsorption tower 27. When the second adsorption tower 27 is connected to the front-end deoxygenation component, the hot blowing device is connected to the first adsorption tower 26 to perform hot blowing dehydration treatment on the first adsorption tower 26. The oxygen pipeline 47 is connected to the hot blowing device. A packing layer 29-1 is provided in the hot blowing device. The oxygen in the oxygen pipeline 47 reacts with the packing layer 29-1 to generate heat energy in the hot blowing device. The front end of the rear gas-liquid separator 21 is connected to the rear cooler 22, and its rear end is connected to the first adsorption tower 26 and / or the second adsorption tower 27 to produce hydrogen products from the gas processed by the rear gas-liquid separator 21.

[0020] The water electrolysis device includes an electrolytic cell 1, an oxygen gas-liquid separator 2, a hydrogen gas-liquid separator 3, an oxygen scrubber 5, and a hydrogen scrubber 6. The oxygen gas-liquid separator 2 and the oxygen scrubber 5 are respectively installed on the oxygen pipeline 47, and the hydrogen gas-liquid separator 3 and the hydrogen scrubber 6 are respectively installed on the hydrogen pipeline 46. The oxygen scrubber 5 and the hydrogen scrubber 6 are respectively connected to the demineralized water inlet 4. Both the oxygen gas-liquid separator 2 and the hydrogen gas-liquid separator 3 are equipped with a return water pipe, which is connected to the electrolytic cell 1 to return the separated liquid to the electrolytic cell 1.

[0021] An oxygen discharge port 7 is provided at the end of the oxygen pipeline 47. An oxygen discharge regulating valve 8 is provided near the oxygen discharge port 7. The oxygen discharge regulating valve 8 controls the oxygen discharge port 7 to discharge oxygen. An oxygen return pipe 48 is connected to the oxygen pipeline 47 and is connected to the oxygen heater 29.

[0022] A three-way valve 11 and a hydrogen oxygen analyzer 9 are installed on the hydrogen pipeline 46. The hydrogen oxygen analyzer 9 is located at the front end of the three-way valve 11 and is used to detect the oxygen content in the hydrogen. A hydrogen oxygen analyzer root valve 10 is provided on the hydrogen oxygen analyzer 9 to control the opening and closing of the hydrogen pipeline 4-6 and the hydrogen oxygen analyzer 9. The three-way valve 11 has a discharge port 12 connected to one side of the valve port for discharging substandard hydrogen. The three-way valve 11 is connected to the front-end deoxygenation assembly.

[0023] The hot blowing device includes an oxygen heater 29 and an electric heater 36 connected to the oxygen heater 29. The oxygen heater 29 is connected to an oxygen return pipe 48, and an oxygen return regulating valve 33 is installed on the oxygen return pipe 48 to control the on / off state of the oxygen pipeline 47 and the oxygen heater 29. The oxygen heater 29 is connected to the front-end deoxygenation assembly, and the electric heater 36 is connected to the first adsorption tower 26 and / or the second adsorption tower 27.

[0024] The oxygen heater 29 includes a packing layer 29-1 and a shell side 29-2. The packing layer 29-1 fills the shell side 29-2. The packing layer 29-1 is connected to the oxygen pipeline 47 through an oxygen return pipe 48. By introducing oxygen from the oxygen pipeline 47 into the packing layer 29-1, the packing layer 29-1 heats up. The packing layer 29-1 uses regenerable adsorption packing such as iron oxide, which can release heat through oxidation reaction. The heat generated by the reaction between the packing layer 29-1 and oxygen heats the hydrogen flowing into the shell side 29-2. The shell side 29-2 is connected to the front-end deoxygenation component and the electric heater 36, respectively, and the hydrogen is heated in the first stage through the shell side 29-2.

[0025] The packing layer 29-1 and the shell side 29-2 are respectively connected to the electric heater 36. A pneumatic valve L34 is provided between the packing layer 29-1 and the electric heater 36, and a pneumatic valve K35 is provided between the shell side 29-2 and the electric heater 36. The electric heater 36 is connected to the first adsorption tower 26, and a pneumatic valve M37 is provided between the electric heater 36 and the first adsorption tower 26. The electric heater 36 is connected to the second adsorption tower 27, and a pneumatic valve N38 is provided between the electric heater 36 and the second adsorption tower 27.

[0026] The front-end deoxygenation assembly includes a deoxygenation tower 13, a front-end cooler 14, and a front-end gas-liquid separator 15. The deoxygenation tower 13 is connected to a three-way valve 11 on the hydrogen pipeline 46. The deoxygenation tower 13 is connected to the front-end gas-liquid separator 15 through the front-end cooler 14. The front-end gas-liquid separator 15 is connected to the first adsorption tower 26, the second adsorption tower 27, and the oxygen heater 29 through pipelines. The front-end gas-liquid separator 15 is connected to the packing layer 29-1 and the shell side 29-2 through pipelines. A pneumatic valve I28 is provided on the side near the packing layer 29-1, and a pneumatic valve J30 is provided on the side near the shell side 29-2. The pneumatic valves I28 and J30 control the connection between the front-end gas-liquid separator 15 and the packing layer 29-1 or the shell side 29-2. A pneumatic valve A16 is provided in front of the pneumatic valves I28 and J30 to control the on / off state of the front-end gas-liquid separator 15 and the oxygen heater 29. A pneumatic valve B17 is provided between the front-end gas-liquid separator 15 and the first adsorption tower 26, and a pneumatic valve C18 is provided between the front-end gas-liquid separator 15 and the second adsorption tower 27.

[0027] A pneumatic valve O39 is provided at the rear end of the first adsorption tower 26, through which the product hydrogen generated by this device is discharged; similarly, a pneumatic valve O40 is provided at the rear end of the second adsorption tower 27, through which the product hydrogen generated by this device is discharged.

[0028] The front end of the back-end gas-liquid separator 21 is connected to the back-end cooler 22. Gas flows into the back-end gas-liquid separator 21 through the back-end cooler 22. The back-end cooler 22 is connected to the oxygen heater 29, the first adsorption tower 26, and the second adsorption tower 27. A pneumatic valve F23 is provided between the back-end cooler 22 and the oxygen heater 29, a pneumatic valve G24 is provided between the back-end cooler 22 and the first adsorption tower 26, and a pneumatic valve H25 is provided between the back-end cooler 22 and the second adsorption tower 27. The rear end of the back-end gas-liquid separator 21 is connected to the first adsorption tower 26 and the second adsorption tower 27. A pneumatic valve D19 is provided between the back-end gas-liquid separator 21 and the first adsorption tower 26, and a pneumatic valve E20 is provided between the back-end gas-liquid separator 21 and the second adsorption tower 27.

[0029] The oxygen reuse pipe 48 is equipped with an oxygen reuse regulating valve 33, and a first temperature sensor 31 is installed on the shell side 29-2. The first temperature sensor 31 is interlocked with the oxygen reuse regulating valve 33, and the opening degree of the oxygen reuse regulating valve 33 is controlled according to the first temperature sensor 31.

[0030] The outlet end of the electric heater 36 is equipped with a second temperature sensor 45, which is connected to the electric heater 36. The switch of the electric heater 36 is controlled according to the second temperature sensor 45.

[0031] The shell side of the oxygen heater and the outlet of the electric heater are respectively equipped with a first temperature sensor 31 and a second temperature sensor 45 to measure the hydrogen temperature T1 and T2 in real time, and are interlocked with the oxygen reuse regulating valve 33 and the electric heater 36. When T1 ≥ Tset, the electric heater is turned off; when T1 ≥ 1.1Tset, the opening of the oxygen reuse regulating valve is reduced by 10%. When T1 is less than Tset, the electric heater is turned on until T2 reaches Tset, at which point the electric heater is turned off, where Tset is the set temperature.

[0032] The liquid level sensor of the back-end gas-liquid separator 21 is interlocked with the pneumatic drain valve 44 at its bottom. When the liquid level is higher than 40% of the separator height, the pneumatic drain valve 44 is opened to drain the liquid. When the liquid level is lower than 10% of the separator height, the pneumatic drain valve 44 is closed.

[0033] This hydrogen production unit includes the following seven operating states: State 1: Electrolyzer 1 is powered on. The hydrogen produced by electrolyzer 1 enters hydrogen gas-liquid separator 3 through hydrogen pipeline 46 for gas-liquid separation. The hydrogen then enters hydrogen scrubber 6 through the top of hydrogen gas-liquid separator 3 to further remove alkali, and then enters three-way valve 11 through the top of hydrogen scrubber 6. Hydrogen oxygen analyzer 9 detects the oxygen content in the gas. If the oxygen content does not meet the standard, the unqualified hydrogen is discharged to discharge port 12 through three-way valve 11. Oxygen produced by electrolyzer 1 enters oxygen gas-liquid separator 2 through oxygen pipeline 47 for gas-liquid separation. The oxygen then enters oxygen scrubber 5 through the top of oxygen gas-liquid separator 2 to further remove alkali and is divided into two paths. In State 1, the oxygen is discharged to oxygen discharge port through oxygen discharge regulating valve 8. When the oxygen content detected by hydrogen oxygen analyzer meets the standard, the hydrogen enters deoxygenation tower 13 through three-way valve 11 to remove trace amounts of oxygen in the product, then enters front-end cooler 14 for further cooling, and then enters front-end gas-liquid separator 15 to remove water produced during the deoxygenation reaction. State 1 is used for equipment startup. After the equipment is running stably, the hydrogen production unit enters states 2-7 in sequence. After state 7 is completed, it re-enters state 2.

[0034] State 2: Oxygen emission regulating valve 8 is closed. Oxygen from the outlet of oxygen scrubber 5 enters the packing layer 29-1 of the oxygen absorption heater after passing through oxygen reuse regulating valve 33 and flow sensor 32. The packing layer 29-1 absorbs oxygen, undergoes an oxidation reaction, and heats up, transferring the heat to the shell side 29-2 of the oxygen absorption heater. The hydrogen after gas-liquid separation is divided into two paths. One path enters the first adsorption tower 26 through pneumatic valve B17 for adsorption and dehydration, and then enters the product gas outlet 42 through pneumatic valves O39 and Q41. The other path... The hydrogen gas enters the shell side 29-2 of the oxygen heater 29 via pneumatic valves A16 and J30 for heat exchange and temperature increase, then enters the electric heater 36 for auxiliary heating. Once a certain temperature is reached, the hydrogen gas enters the second adsorption tower 27 via pneumatic valve N38, where it is hot-blown to remove adsorbed water. It then passes through pneumatic valve H25 into the downstream cooler 22 and downstream gas-liquid separator 21 for water removal. Finally, it enters the first adsorption tower 26 via pneumatic valve D19 for further water removal and is directed to the product gas outlet. When the liquid level in the downstream gas-liquid separator 21 no longer increases, the system enters state 3.

[0035] State 3: Oxygen discharge regulating valve 8 is open, and oxygen from the outlet of oxygen scrubber 5 is discharged through oxygen discharge regulating valve 8. Hydrogen after gas-liquid separation is divided into two paths: one path enters the first adsorption tower 26 through pneumatic valve B17 for adsorption and dehydration, and then enters the product gas outlet through pneumatic valves O39 and Q41; the other path enters the second adsorption tower 27 through pneumatic valve C18 for cold blowing to cool the second adsorption tower 27. Hydrogen exiting the second adsorption tower 27 enters the electric heater 36 through pneumatic valve N38 for heating, and then enters the packing layer 29-1 of the oxygen absorption heater 29 through pneumatic valve L34 to absorb hydrogen and reduce the packing of the oxygen absorption heater 29. Excess hydrogen then enters the downstream cooler 22 and the downstream gas-liquid separator 21 through pneumatic valves I28 and F23 for dehydration, and then enters the first adsorption tower 26 through pneumatic valve D19 for dehydration and flows to the product gas outlet. When the liquid level in the downstream gas-liquid separator 21 no longer increases, state 4 is entered.

[0036] State 4: Oxygen discharge regulating valve 8 is open, and oxygen from the outlet of oxygen scrubber 5 is discharged through oxygen discharge regulating valve 8; all hydrogen after gas-liquid separation enters the first adsorption tower 26 through pneumatic valve B17 for adsorption and dehydration, and then enters the product gas outlet through pneumatic valve O39 and pneumatic valve Q41; when the water content of the product gas outlet does not meet the standard, state 5 is entered.

[0037] State 5: Oxygen emission regulating valve 8 is closed. Oxygen from the outlet of oxygen scrubber 5 enters the packing layer 29-1 of the oxygen absorption heater after passing through oxygen reuse regulating valve 33 and flow sensor 32. The packing layer 29-1 oxidizes and heats up, transferring heat to the shell side 29-2 of the oxygen absorption heater. Hydrogen after gas-liquid separation is divided into two paths. One path enters the second adsorption tower 27 through pneumatic valve C18 for adsorption and dehydration, and then enters the product gas outlet through pneumatic valves P40 and Q41. The other path enters the product gas outlet through pneumatic valves... Valves A16 and J30 allow hydrogen to enter the shell side 29-2 of the oxygen absorption reactor for heat exchange and temperature increase, then it enters the electric heater 36 for auxiliary heating. Once a certain temperature is reached, hydrogen gas passes through pneumatic valve M37 into the first adsorption tower 26, where it is hot-blown to remove adsorbed water. It then passes through pneumatic valve G24 into the downstream cooler 22 and downstream gas-liquid separator 21 for water removal. Finally, it passes through pneumatic valve E20 into the second adsorption tower 27 for further water removal and then to the product gas outlet. When the liquid level in the downstream gas-liquid separator 21 no longer increases, the process enters state 6.

[0038] State 6: Oxygen discharge regulating valve 8 is open, and oxygen from the outlet of oxygen scrubber 5 is discharged through oxygen discharge regulating valve 8. Hydrogen after gas-liquid separation is divided into two paths: one path enters the second adsorption tower 27 through pneumatic valve C18 for adsorption and dehydration, and then enters the product gas outlet through pneumatic valves P40 and Q41; the other path enters the first adsorption tower 26 through pneumatic valve B17 for cold blowing to cool the first adsorption tower 26. Hydrogen exiting the first adsorption tower 26 enters the electric heater through pneumatic valve M37 for heating, and then enters the packing layer 29-1 of the oxygen absorption heater through pneumatic valve L34 for hydrogen absorption and reduction. Excess hydrogen then enters the downstream cooler 22 and the downstream gas-liquid separator 21 through pneumatic valves I28 and F23 for dehydration, and then enters the second adsorption tower 27 through pneumatic valve E20 for dehydration and is then directed to the product gas outlet. When the liquid level in the downstream gas-liquid separator 21 no longer increases, state 7 is entered.

[0039] State 7: Oxygen discharge regulating valve 8 is open, and oxygen from the outlet of oxygen scrubber 5 is discharged through oxygen discharge regulating valve 8; all hydrogen after gas-liquid separation enters the second adsorption tower 27 through pneumatic valve C18 for adsorption and dehydration, and then enters the product gas outlet through pneumatic valve P40 and pneumatic valve Q41; when the water content of the product gas outlet does not meet the standard, it re-enters state 2.

[0040] The above description of the disclosed embodiments enables those 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 general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention is not 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.

[0041] Although this document uses many terms corresponding to the reference numerals in the figures, the possibility of using other terms is not excluded; these terms are used only to more conveniently describe and explain the essence of this utility model; interpreting them as any kind of additional limitation would be contrary to the spirit of this utility model.

Claims

1. An energy-saving water electrolysis hydrogen production device, characterized in that, include: Water electrolysis device, front-end deoxygenation component, first adsorption tower (26), second adsorption tower (27), hot blowing device, and rear-end gas-liquid separator (21); The water electrolysis device is equipped with a hydrogen pipeline (46) and an oxygen pipeline (47). The front-end deoxygenation component is connected to the hydrogen pipeline (46) at its front end and to the product gas outlet (42) at its rear end through parallel pipeline one and pipeline two. The parallel pipeline one is equipped with valve B, first adsorption tower (26) and valve O in sequence, and the parallel pipeline two is equipped with valve C, second adsorption tower (27) and valve P in sequence. The hot blowing device includes an oxygen heater (29) and an electric heater (36). The oxygen heater (29) includes a packing layer (29-1) and a shell side (29-2). The packing layer (29-1) fills the shell side (29-2). The inlet of the shell side (29-2) is connected to a pipeline equipped with valve J, and the outlet of the packing layer (29-1) is connected to a pipeline equipped with valve I. The pipeline equipped with valve J and the pipeline equipped with valve I are connected to the rear end of the front deoxygenation assembly through a pipeline equipped with valve A. The outlet of (29-2) and one inlet of the packing layer (29-1) are respectively connected to one end of the electric heater (36) through a pipeline equipped with valve K and a pipeline equipped with valve L. The other inlet of the packing layer (29-1) is connected to the oxygen pipeline (47) through the oxygen return pipe (48). The other end of the electric heater (36) is connected to the pipeline between the first adsorption tower (26) and valve O through a pipeline equipped with valve M, and to the pipeline between the second adsorption tower (27) and valve P through a pipeline equipped with valve N. The rear gas-liquid separator (21) is connected to the front end of the rear cooler (22). The front end of the rear cooler (22) is connected to the outlet of the packing layer (29-1) through a pipeline with valve F, a pipeline with valve G connected to the pipeline between valve B and the first adsorption tower (26), and a pipeline with valve H connected to the pipeline between valve C and the second adsorption tower (27). The rear end of the rear gas-liquid separator (21) is connected to the pipeline between valve B and the first adsorption tower (26) through a pipeline with valve D, and a pipeline with valve E connected to the pipeline between valve C and the second adsorption tower (27). In the pipeline between valve B and the first adsorption tower (26), the connection point of the valve D pipeline is between the connection point of the valve B and the valve G pipeline. In the pipeline between valve C and the second adsorption tower (27), the connection point of the valve E pipeline is between the connection point of the valve C and the valve H pipeline.

2. The energy-saving water electrolysis hydrogen production equipment according to claim 1, characterized in that, The packing material of the packing layer (29-1) is a regenerable adsorption packing material that can release heat through oxidation.

3. The energy-saving water electrolysis hydrogen production equipment according to claim 2, characterized in that, The filler in the packing layer (29-1) is iron oxide.

4. An energy-saving water electrolysis hydrogen production device according to claim 1, 2, or 3, characterized in that, The oxygen reuse pipe (48) is equipped with an oxygen reuse regulating valve (33), and a first temperature sensor (31) is installed on the shell side (29-2). The first temperature sensor (31) is electrically connected to the oxygen reuse regulating valve (33).

5. The energy-saving water electrolysis hydrogen production equipment according to claim 1, characterized in that, The other end of the electric heater (36) is provided with a second temperature sensor (45), which is connected to the electric heater (36).

6. The energy-saving water electrolysis hydrogen production equipment according to claim 1, characterized in that, The front-end deoxygenation assembly includes a deoxygenation tower (13), a front-end cooler (14), and a front-end gas-liquid separator (15). The deoxygenation tower (13) is connected to a hydrogen pipeline (46). The deoxygenation tower (13) is connected to the front-end gas-liquid separator (15) through the front-end cooler (14). The front-end gas-liquid separator (15) is connected to a first adsorption tower (26) and / or a second adsorption tower (27).

7. The energy-saving water electrolysis hydrogen production equipment according to claim 1, characterized in that, The hydrogen pipeline (46) is equipped with a three-way valve (11) and a hydrogen oxygen analyzer. A discharge port (12) is connected to one side of the valve port of the three-way valve (11). The deoxygenation tower (13) is connected to the hydrogen pipeline (46) through the three-way valve (11).

8. The energy-saving water electrolysis hydrogen production equipment according to claim 1, characterized in that, The water electrolysis device includes an electrolytic cell (1), an oxygen gas-liquid separator (2), a hydrogen gas-liquid separator (3), an oxygen scrubber (5), and a hydrogen scrubber (6). The oxygen gas-liquid separator (2) and the oxygen scrubber (5) are respectively installed on the oxygen pipeline (47), and the hydrogen gas-liquid separator (3) and the hydrogen scrubber (6) are respectively installed on the hydrogen pipeline (46). The oxygen scrubber (5) and the hydrogen scrubber (6) are respectively connected to the demineralized water inlet (4). The oxygen gas-liquid separator (2) and the hydrogen gas-liquid separator (3) are both equipped with a return water pipe, which is connected to the electrolytic cell (1).

9. The energy-saving water electrolysis hydrogen production equipment according to claim 1, characterized in that, An oxygen outlet (7) is provided at the end of the oxygen pipeline (47), and an oxygen discharge regulating valve (8) is provided near the oxygen outlet (7).

10. The energy-saving water electrolysis hydrogen production equipment according to claim 1, characterized in that, Valves A through P are all pneumatic valves.

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