2. 检查盘形弹簧是否变形, 盘型弹簧无变形,无裂纹。并做金相检查
Electrolyzer Overhaul 1, Site Safety Technical Measures 1 all the site staff's clothing, the use of tools should comply with the requirements of safety regulations 2 running equipment and maintenance equipment isolation, rectifier cabinet power cut. 3. The hydrogen content in the air in the maintenance area should be measured every two hours during the maintenance work. 4 when Deoiling, should be done outdoors as far as possible, if it must be done indoors, the amount of acetone in the air should not exceed 400mg / M3. The tools, materials and spare parts for inspection and repair should be kept in good order, maintenance site "three do not fall to the ground. ". Spare parts before major repair requirements 1 plate gasket external smooth without scratches, without any debris attached to the above. Gasket strict and even, no crack, bending phenomenon. 2 The measurement of the thickness of the single gasket shall not exceed 0.20 mm, and the cumulative deviation of 50 pieces shall not exceed 0.50 mm. The dimension deviation of the locating pin hole can not exceed 0.5 mm. The gas-liquid channel is strict and neat without burr. 5 The density of Asbestos cloth is 138 threads per 10 * 10 cm 2,174 threads per 10 * 10 cm 2. 6 Pole frame sealing line is good, no dirt, no through transverse grain, no large area deformation phenomenon. There is no corrosion product on the surface of the electrode plate, the nickel layer is intact, the sealing line does not penetrate through the transverse lines, and there is no dirt and dirt. There is no deformation and no crack in the plate spring. 3. Preparation and Inspection 1. Drain the Lye from the electrolyzer back to the alkaline tank and flush with a large amount of desalted water until the effluent is clear and transparent. Check the valve switch and leakage of hydrogen production system. Check and clean electrode cabinet, electrode plate, main electrode couplet, asbestos cloth and other parts. 4 check the fastening bolt, nut and disc spring. 5 record the four-point distance of main electrode plate and butterfly spring height. 6 from the positive to the negative pole in each pole box in order to type the word number. Clean up the alkaline deposit on the outside of the electrolyzer and mark it at the soakage. Remove all connecting flanges and all pipe accessories connected to the electrolyzer, mark 9 well and cover the pipe mouth with cloth. 10 loosen the Stud Bolt evenly and in turn. 11 remove the upper bolt and remove the disc Spring Assembly. Take out the poles and plates in sequence by serial number. All unloaded Poles and plates shall be placed on board and shall not be stacked to prevent joint damage and deformation of parts. The repair technology and repair quality of ELECTROLYZER. Brush the dirt on the plate with copper wire and rinse with desalting water. 2. Check the corrosion of anode and Cathode. 3. Check and clean the sealing wire. Only use copper wire brush or wooden tools for cleaning. Plate and additional plate should be connected firmly, no loose 4. Nickel plating on anode side of plate has no serious peeling or peeling phenomenon 5. There is no sundry in the sealing line of the plate, and there is no penetrating transverse grain 6. Plate sealing surface shall not exceed 0.2 mm pole frame 1. Rinse the pole frame and asbestos cloth with desalting water and brush with a soft brush 2. Check the airway and Lye duct 3. Clean the sealing wire of the pole box. Only use copper wire brush or wooden tools. Check the condition of asbestos cloth and do ventilation test, if unqualified should be replaced 5. The sealing line of the pole frame is free from dirt and penetrative cross-grain 6. The opening ring of the pole frame is in place, the cushion block is firm, no looseness 7. After the light transmission experiment, asbestos cloth has no light transmission spot, no crack and looseness 8. Pole frame air hole and alkaline liquid hole without dirt plug five, cell accessories 1. Clean and tighten the screw of bolt and nut, remove rust, tighten bolt thread without disorder. 2. Check whether the disc spring deformation, disc spring without deformation, no crack. And do metallographic examination 3. Check bakelite insulation gasket, should not break. Check hydrogen, oxygen, Alkali channels, should be free of dirt six, asbestos cloth through light test and installation through light test 1 will be equipped with asbestos cloth plate frame on the transparency ring barrel, the ring barrel with three 60 w light bulbs, lamp distance from the cloth 400 mm. When the experiment is carried out, it should be examined in the dark room. If the diameter of the transparent point of asbestos cloth is larger than 0.2 mm, the cotton cloth should be replaced when the number of the transparent point is more than 10, less than this standard can be repaired. Replace 1 place the pole frame on the worktable, put the pole frame evenly along the inner diameter of the pole frame, put the opening ring on the Asbestos Cloth, install the asbestos cloth tensioning clamp on the diaphragm frame, and fasten the bolts on the clamp symmetrically, measure the difference of the protruding part of the opening ring of each side of the tensioning clamp is less than 0.5 mm, then the installation of the asbestos cloth is successful. 2. Trim the asbestos cloth along the inside of the pole frame. Remove the tensioning clamp and gently tap the piece into the opening of the opening ring with a wooden hammer. Use a drill to remove fragments of Asbestos cloth from hydrogen, oxygen and Alkali channels and keep them open. 7. Assembly of the ELECTROLYZER 1 check the level of the insulating gasket with a level ruler, the height of which shall not exceed 2mm. Clean all parts with cupronickel before assembly. Move the plate 80 mm along the pole. Install the insulating sleeve at the tension bolt position on the main plate and install the tension bolt. 2 adjust the horizontal position of the tension bolt below, the horizontal deviation is not more than 2 mm. Install the six dowels on the main cathode plate and hang the plate gasket on it, then install the pole frame with the side of the opening ring facing to the main cathode plate. 4 The pole box, plate, intermediate pole box are all installed according to the number when disassembling, no sundries are allowed to fall into the electrolyzer when installing. Insert the tension bolt and set the bolt. 8. The cell fastening the cell heating 1. Steam of 0.1(0.15 MPA) is passed through the hydrogen-oxygen groove at one end of the cell, and is heated by discharge from the LYE inlet pipe. The heating must be continuous. Starting from heating, tighten the electrolytic cell bolts evenly every 2 hours. The screw-in size difference of each fastening bolt should not exceed 1mm. 2 In the course of fastening bolt, the compression quantity of disc spring should not be more than 4mm, and the difference of four angles between two main plates measured should not be more than 0.1 mm. 3 after heating for 30 ~ 40 hours, the bolts were tightened 1 ~ 2 times, and then the cell was cooled once, but the tightening force distance was not more than 4400KGF / m. 4 after electrolytic fastening, the size of the two main plates should be equal to that before disassembly or when the size of the last second fastening is stable. Cold Cell Tight 1 the cell cold tight can be in the cell cold state directly tighten the bolt, but the fastening time is the same as the hot tight. 2 when the load of each bolt reaches 4400kgf / m, the water pressure test should be carried out on the electrolyzer. Water pressure test of the ELECTROLYZER 1 after the electrolyzer is cooled, the electrolyzer shall be subjected to a water pressure test by first filling the water and gradually raising the pressure from 0.8 MPA to 1.2 MPA. After 10 minutes, if the pressure does not decrease, the pressure shall be lowered to 1.0 MPA for inspection. If local leakage is found, the bolts may be tightened again. After the water pressure test is qualified, if the ELECTROLYZER does not start operation, the electrolyzer shall be filled with 10% potassium hydroxide solution to prevent rust. The assembly of Electrolyzer 1 the Assembly of electrolyzer adopts the way of vertical stacking, the number of electrolyzer plates is numerous, accurate positioning is the key, otherwise it is inevitable to be distorted. 2 calibrate the assembling base and make the positioning monitor to ensure the correct positioning of the assembling process. Adopt electrohydraulic technology, at the same time use a number of liquid level tensioner, press on the corners to ensure that all parts of the force uniform. Use a professional tool to monitor the force on each insulating gasket and plate. To avoid the phenomenon of uneven force. Affect the electrolyzer seal and service life. 5 electrolyzer adopts many tension bolts to fasten, gasket bears force more even. After multi-channel process and appearance inspection, the pressure and seal of the electrolyzer are checked.