Electrolyzer, method for controlling same, and program

Patent metadata

Field	Value
Publication number	US-2022195613-A1
Application number	US-202017599906-A
Country	US
Kind code	A1
Filing date	Mar 18, 2020
Priority date	Apr 1, 2019
Publication date	Jun 23, 2022
Grant date	—

Abstract

An electrolyzer stores of electrolytic cells, in which a pressing force applied to the stack is maintained by automatically adjusting the position of a locking mechanism of a safety device. The electrolyzer includes a stack obtained by stacking a plurality of electrolytic cells with membranes interposed therebetween, a pressing plate arranged on one end side in a stacking direction of the stack, an actuator which generates a pressing force along the stacking direction by moving the pressing plate, a safety device which is configured to maintain the pressing force by allowing the locking mechanism to come into contact with the contact plate to prevent the retraction of the pressing plate, when the actuator is not operated, and a control device which adjusts a distance between the locking mechanism and the contact plate within a specific range so as to maintain the pressing force which acts on the stack.

First claim

1 . An electrolyzer comprising:
a stack obtained by stacking a plurality of electrolytic cells each having an anode chamber and a cathode chamber with membranes interposed therebetween; a pressing plate arranged at least one end side in a stacking direction of the stack; an actuator which moves the pressing plate to thereby generate a pressing force along the stacking direction; a safety device which has: a contact plate arranged at a predetermined position; a rod attached to the pressing plate so as to extend in the stacking direction and moving relative to the contact plate together with the pressing plate; and a locking mechanism attached to the rod, and is configured so that when the actuator does not operate, the locking mechanism comes into contact with the contact plate to prevent the rod and the pressing plate from retreating, thereby maintaining the pressing force; and a control device which adjusts a distance between the locking mechanism and the contact plate within a specific range so as to maintain the pressing force acting on the stack.

2 . The electrolyzer according to claim 1 , wherein the control device adjusts the position of the locking mechanism and/or the contact plate so as to maintain the pressing force acting on the stack at 10 kg/cm 2 or more.

3 . The electrolyzer according to claim 1 , wherein the control device adjusts the position of the locking mechanism and/or the contact plate so as to maintain the distance between the locking mechanism and the contact plate at the maximum clearance C MAX or less per cell calculated in the following equation (1):
C MAX (mm/cell)=seal surface pressure during electrolysis (kg/cm 2 )×0.011−0.108  (1).

4 . The electrolyzer according to claim 1 , wherein the control device adjusts the position of the locking mechanism and/or the contact plate so as to maintain the distance between the locking mechanism and the contact plate at 7 mm or less.

5 . The electrolyzer according to claim 1 , wherein the control device moves the locking mechanism and/or the contact plate at a speed of 4.5 mm/h or more.

6 . (canceled)

7 . (canceled)

8 . A method for controlling an electrolyzer including:
a stack obtained by stacking a plurality of electrolytic cells each having an anode chamber and a cathode chamber with membranes interposed therebetween, a pressing plate arranged at least one end side in a stacking direction of the stack, an actuator which moves the pressing plate to thereby generate a pressing force along the stacking direction, and a safety device which has: a contact plate arranged at a predetermined position; a rod attached to the pressing plate so as to extend in the stacking direction and moving relative to the contact plate together with the pressing plate; and a locking mechanism attached to the rod, and is configured so that when the actuator does not operate, the locking mechanism comes into contact with the contact plate to prevent the rod and the pressing plate from retreating, thereby maintaining the pressing force, the method comprising a control step of: causing a control device to adjust a distance between the locking mechanism and the contact plate within a specific range so as to maintain the pressing force acting on the stack.

9 . The method for controlling the electrolyzer according to claim 8 , wherein in the control step, the control device adjusts the position of the locking mechanism and/or the contact plate so as to maintain the pressing force acting on the stack at 10 kg/cm 2 or more.

10 . The method for controlling the electrolyzer according to claim 8 , wherein in the control step, the control device adjusts the position of the locking mechanism and/or the contact plate so as to maintain the distance between the locking mechanism and the contact plate at the maximum clearance C MAX or less per cell calculated in the following equation (1):
C MAX (mm/cell)=seal surface pressure during electrolysis (kg/cm 2 )×0.011−0.108   (1).

11 . The method for controlling the electrolyzer according to claim 8 , wherein in the control step, the control device adjusts the position of the locking mechanism and/or the contact plate so as to maintain the distance between the locking mechanism and the contact plate at 7 mm or less.

12 . The method for controlling the electrolyzer according to claim 8 , wherein in the control step, the control device moves the locking mechanism and/or the contact plate at a speed of 4.5 mm/h or more.

13 . (canceled)

14 . (canceled)

15 . A recording medium having recorded thereon a program which causes a computer to execute a step group of controlling an electrolyzer including:
a stack obtained by stacking a plurality of electrolytic cells each having an anode chamber and a cathode chamber with membranes interposed therebetween, a pressing plate arranged at least one end side in a stacking direction of the stack, an actuator which moves the pressing plate to thereby generate a pressing force along the stacking direction, and a safety device which has: a contact plate arranged at a predetermined position; a rod attached to the pressing plate so as to extend in the stacking direction and moving relative to the contact plate together with the pressing plate; and a locking mechanism attached to the rod, and is configured so that when the actuator does not operate, the locking mechanism comes into contact with the contact plate to prevent the rod and the pressing plate from retreating, thereby maintaining the pressing force, wherein the step group includes a control step of causing a control device to adjust a distance between the locking mechanism and the contact plate within a specific range so as to maintain the pressing force acting on the stack.

16 . The recording medium according to claim 15 , wherein in the control step, the control device adjusts the position of the locking mechanism and/or the contact plate so as to maintain the pressing force acting on the stack at 10 kg/cm 2 or more.

17 . The recording medium p according to claim 15 , wherein in the control step, the control device adjusts the position of the locking mechanism and/or the contact plate so as to maintain the distance between the locking mechanism and the contact plate at the maximum clearance C MAX or less per cell calculated in the following equation (1):
C MAX (mm/cell)=seal surface pressure during electrolysis (kg/cm 2 )×0.011−0.108  (1).

18 . The recording medium according to claim 15 , wherein in the control step, the control device adjusts the position of the locking mechanism and/or the contact plate so as to maintain the distance between the locking mechanism and the contact plate at 7 mm or less.

19 . The recording medium according to claim 15 , wherein in the control step, the control device moves the locking mechanism and/or the contact plate at a speed of 4.5 mm/h or more.

20 . The recording medium according to claim 15 , wherein the locking mechanism includes a lock nut.

21 . The recording medium according to claim 15 , further including a detection step of detecting a change in the position of the locking mechanism with the movement of the pressing plate by a sensor,
wherein in the control step, the control device adjusts the distance between the locking mechanism and the contact plate within a specific range so as to maintain the pressing force acting on the stack, based on the position change of the locking mechanism detected in the detection step.

Assignees

• Asahi Chemical Ind

Inventors

• Suzuki Yuto
• Anami Yasutaka
• Hirata Koichi

Classifications

• C25B15/04

  Regulation of the inter-electrode distance · CPC title

• F15B15/26

  Locking mechanisms · CPC title

• C25B15/023

  Measuring, analysing or testing during electrolytic production · CPC title

• C25B9/77 Primary

  having diaphragms · CPC title

• C25B1/34

  Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis · CPC title