Honda Motor Co., Ltd.

Daisuke Kurashina

Jun Takeuchi

Hisashi Nagaoka

Koji Nakazawa

Yukihiro Fukushima

Hiroyuki Ishikawa

Kenji Taruya

Nobuyuki Kawasaki

Yuji Yamakawa

Tetsuya Yoshida

Masahiro Mohri

Masanori Okabe

Yuta Hoshi

Daisuke Misu

Aoi Miyake

Takamitsu Kino

Ryuki Goda

A water electrolysis system produces hydrogen gas at a higher pressure than oxygen gas. A Peltier cooler is disposed between a gas-liquid separator and a back pressure valve in a hydrogen gas flow path, and cools and dehumidifies the hydrogen gas. A temperature sensor measures a temperature in the vicinity of the Peltier cooler, and outputs a temperature measurement value. A pressure sensor measures a pressure of the hydrogen gas between a cathode and the back pressure valve in the hydrogen gas flow path, and outputs a pressure measurement value. A control unit controls a cooling temperature by the Peltier cooler, in a manner so that the temperature measurement value becomes a target temperature that exceeds the freezing point of water corresponding to the pressure measurement value. At least a portion of the target temperature becomes lower as the pressure measurement value increases.

Water electrolysis system and control method therefor

In a water electrolysis system and a control method therefor, when a depressurizing process is performed, pressure reducing valves for high pressure reduce the pressure of a high pressure hydrogen. A first pressure detecting sensor detects, as a first pressure, a pressure of the high pressure hydrogen on a more upstream side than the pressure reducing valves for high pressure. A second pressure detecting sensor detects, as a second pressure, a pressure of the high pressure hydrogen on a more downstream side than a first pressure reducing valve of the pressure reducing valves for high pressure. Based on the first pressure or the second pressure, a controller controls a degree of opening of a depressurization control valve.

A water electrolysis system includes a water electrolysis device; a water circulation circuit section including a water circulation pump; an antifreeze circulation circuit section including an antifreeze circulation pump; and a heat exchanger configured to perform heat exchange between the water circulation circuit section and the antifreeze circulation circuit section. Before water electrolysis is started by the water electrolysis device, a control device of the water electrolysis system circulates water by driving the water circulation pump and sets the antifreeze circulation pump to an operationally stopped state.

Method of operating water electrolysis system and water electrolysis system

A water electrolysis system is equipped with a water electrolysis device, a water supply passage, a hydrogen supply passage, a gas-liquid separator, a first water drainage passage, a first water drainage valve, a second water drainage valve, a determination unit, and a valve control unit. In a method of stopping operation of the water electrolysis system, in a water drainage step, in the case that the determination unit determines that operation of the water electrolysis device has been stopped, the first water drainage valve is controlled to be placed in a valve open state, thereby draining liquid water from the gas-liquid separator into the first water drainage passage.

Water electrolysis system and method of stopping operation thereof

In a water electrolysis system and a method of controlling the water electrolysis system, a control device places a high pressure water discharge solenoid valve, a depressurizing solenoid valve, and a low pressure water discharge solenoid valve in the closed state. Further, a pressure acquisition unit obtains the electrolysis time pressure as a pressure in the low pressure water sealing container during production of hydrogen by a water electrolyzer. Further, the control device determines the occurrence of hydrogen leakage in a depressurizing line based on at least the electrolysis time pressure.

Water electrolysis system and method of controlling the same

A high pressure water electrolysis device includes an electrolyte membrane, an anode power supplying body, a cathode power supplying body, an anode separator, a cathode separator, a cathode chamber, a seal member, and a protective sheet member. The protective sheet member is interposed between the electrolyte membrane and the anode power supplying body and includes a frame part and a through hole formation part. The frame part faces the seal member as a seal receiving part in a stacking direction. The through hole formation part is provided inwardly of the frame part. In the through hole formation part, a plurality of through holes are provided. The through hole formation part has the plurality of through holes from an inner side to outer side of a range that faces an anode catalyst part in the stacking direction.

High pressure water electrolysis device

A water electrolysis system includes a water electrolysis apparatus, an electric component, and a casing. The electric component is to operate the water electrolysis apparatus. The casing includes a housing chamber, an electric component chamber, and a buffering chamber. The housing chamber has a first ventilation air inlet to introduce external air into the housing chamber and houses the water electrolysis apparatus. The electric component chamber has a second ventilation air inlet to introduce the external air into the electric component chamber and houses the electric component. The first ventilation air inlet and the second ventilation air inlet are separate from each other. The buffering chamber is in communication with the first ventilation air inlet and the second ventilation air inlet. An air pressure in the buffering chamber is to be maintained at atmospheric pressure.

Water electrolysis system

A water electrolysis system includes a high-pressure hydrogen production unit for electrolyzing water to generate oxygen and high-pressure hydrogen (the pressure of the high-pressure hydrogen being higher than that of the oxygen), and a gas-liquid separation unit for removing water contained in the high-pressure hydrogen. The gas-liquid separation unit is placed on a hydrogen pipe for discharging the high-pressure hydrogen from the high-pressure hydrogen production unit. In addition, the water electrolysis system includes a high-pressure hydrogen supply pipe for transferring dewatered high-pressure hydrogen from the gas-liquid separation unit, a cooling unit, which is placed on the high-pressure hydrogen supply pipe and is capable of variably controlling the temperature of the high-pressure hydrogen to adjust the humidity of the high-pressure hydrogen, and a control unit.

Method for operating the water electrolysis system

A high pressure water electrolysis system includes a high pressure water electrolysis device, a hydrogen storage device, a high pressure hydrogen pipe, a branch pipe, a non-return valve, a pressure detector, and a controller. The controller includes a threshold storage device, a threshold determination device, and a solenoid valve opening/closing operation device. The threshold storage device is configured to store a first threshold of a pressure value detected by the pressure detector and a second threshold lower than the first threshold. The threshold determination device is configured to determine whether or not the pressure value detected by the pressure detector has reached the second threshold. The solenoid valve opening/closing operation device is configured to open and close a solenoid valve if it is determined that the pressure value detected by the pressure detector has reached the second threshold.

High pressure water electrolysis system and method for activating same

In a method of stopping an operation of a water electrolysis system, an on-off valve disposed in a pressure release line communicating with a cathode side of an electrolytic membrane is opened while an electrolytic current is applied between power feeders to electrolyze water for generating oxygen on an anode side of the electrolytic membrane and high pressure hydrogen having a higher pressure than a pressure of the oxygen on the cathode side. A value of the electrolytic current is reduced in a predetermined cycle or continuously. One of a specific resistance and conductivity of water to be supplied to the high pressure hydrogen producing apparatus is detected. The value of the electrolytic current is increased if the specific resistance is equal to or lower than a first predetermined value, or if the conductivity is equal to or higher than a second predetermined value.

Water electrolysis system and method of stopping operation of water electrolysis system

Water electrolysis system and method for operating the same

A water electrolysis system includes a water electrolysis apparatus for electrically decomposing water to generate oxygen and high-pressure hydrogen having a pressure higher than the oxygen, a gas-liquid separator connected to a hydrogen pipe which discharges the high-pressure hydrogen from the water electrolysis apparatus, for separating water contained in the high-pressure hydrogen, a high-pressure hydrogen outlet pipe for delivering the high-pressure hydrogen separated from water from the gas-liquid separator, a water drainage line for discharging the water from the gas-liquid separator, and a gas depressurizing line connected to the gas-liquid separator, for degassing the gas-liquid separator before the water is discharged from the water drainage line into the water drainage line.

Water electrolysis system and method of operating same

A method for operating a water electrolysis system includes determining whether or not a water electrolysis apparatus is shut down. The water electrolysis system includes the water electrolysis apparatus, a water circulation apparatus, and a gas-liquid separation apparatus. The water electrolysis apparatus includes power feeders provided on an anode side and a cathode side of an electrolyte membrane. The water electrolysis apparatus generates oxygen on the anode side and generates hydrogen on the cathode side at a higher pressure than a pressure of the oxygen by electrolysis of water. Pressure on the cathode side is released when it is determined that the water electrolysis apparatus is shut down. The water circulation apparatus is operated until a concentration of hydrogen remaining on the anode side is a specified value or less under a condition in which a release of pressure on the cathode side is completed.

Method for operating water electrolysis system

A water electrolysis system includes a high-pressure water electrolysis apparatus and a gas-liquid separation device. The gas-liquid separation device includes a block member which includes a gas-liquid separation opening and a water-level detection opening. The gas-liquid separation opening and the water-level detection opening extend substantially vertically and includes respective bottom portions which integrally communicate with a discharge pipe. The discharge pipe is disposed at a lower side portion of the block member. The water-level detection opening includes a top portion and a top water-level detection section. The block member further includes an inlet hole in which the hydrogen is introduced from the high-pressure water electrolysis device. The inlet hole is disposed at an upper side portion of the block member. The inlet hole is positioned above the top water-level detection section of the water-level detection opening.

Growing community of inventors

Wako, Japan

Daisuke Kurashina