When installing, fix the bolt in the seat plate, and the two hole positions are separated by a section isolating sleeve 1, so that the bead is moved up and down. 5~2mm, can make the gas author Communications: North China side Shanxi Bokang Pharmaceutical Co. Ltd. Taiyuan 11 and discharged from the seat hole, and then fixed in the original piece of broad bead type valve positions. Hexi District Chemical Road No. 1 030021 edit oxidation reactions: Gilman maleic anhydride production by molten salt heat exchanger conversion. My company production of maleic anhydride for more than 30 years, the molten salt heat exchanger used several kinds of structures, but are not ideal. Later, a U tube heat exchanger was designed (see, but no drain pipe 2). Although there are some effects, there are still some problems.

The use of U tube heat exchanger, in the production process can reduce a day and night operation of the 18.5kW submerged pump, its economic benefits are very impressive. The equipment does not belong to the pressure vessel, the manufacture and maintenance are not very strict, and the structure is simple. Its disadvantage is that the service life is short, only 6~7 months.

The U tube heat exchanger enters the water at one end and produces steam at the other. Outside the tube is 3701: molten salt. After using a period of time, the pipe is filled with scale, which makes the U pipe blocked and even cause rupture. Only when the leaky U pipe is sealed can the production be continued, but the number of sealed U tubes can not be too much. Otherwise, the heat exchange area will be reduced and can not meet the production requirements.

We cut open the U tube, and found that the blocked parts were all near the elbow of the steam outlet, and the location of the broken pipe was basically in this part.

Water is heated and vaporized from one end of the pipe into the human body. Impurities and salts in water are also increasing. Water in the U pipe forms the water purification section and the brine section. Over time, the U tube wall slowly deposited a layer of scale until the pipe blocked, causing the pipe burst.

According to the actual situation analysis and blockage of the U-shaped tube above the conclusion: the only section of the water pipe brine discharged in time to reduce tube water salt concentration to reduce tube fouling. Therefore, to increase the sewage pipe measures in U-shaped pipe, valve and exhaust valve spring suction crushing, fracture phenomenon and history are too - valve pick Joe Xiao Hong type 1401 vacuum chestnut in use through the 1401 suction vacuum pump. Broken valve or spring from the valve seat hole Jinren pump body, pump and valve caused by scratches, pump vacuum drop, cause the pump and valve scrap. In view of the above situation. I plant 141, vacuum chestnut suction and exhaust improvements, the original spring valve plate into a combination of steel balls.

See using the improved method, plate valve seat plate 3, 4, two in the middle of each block in the suction and discharge orifice is provided on a 412.7~13mm ball 5 (available waste 1. sewage mains (076mmx 5.1. 4 tube plate type pipe 6. box 7. water inlet and steam outlet 8. "- scale U type tube schematic diagram of sewage test the heat exchanger to determine emissions once every 4li, every time 3S. emission increased in U tube drainage pipe, with nearly a year found no blockage and cracking of the U tube. Processing a U-shaped tube heat exchanger will cost nearly 10000 yuan. The original one year to two units, and regularly stop plugging U tube; increase the sewage pipe, this phenomenon has not appeared, and has produced considerable economic benefits.

Shi Gang Li 338004 vacuum in the working state, inhale, push the ball in the gas, with gas float 1.5~2mm, gas suction hole along the lower valve seat; exhaust, ball by gravity and exhaust pressure falls under the valve seat hole, contact the ball and the orifice to form a seal for gas discharge from the pump the exhaust port, the formation of a vacuum. The production practice has proved that the cost of maintenance and the damage to the pump are obviously lower than that of the disc type valve when it is switched to the bead valve, but the technical indexes and service life are higher than that of the disc valve. The comprehensive efficiency of vacuum pump has been greatly improved. Because of contact with the ball valve seat hole ring line, the contact area of small seal, general vacuum can reach more than -.95MPa. After 5 years of operation inspection, each group of beads valve continuous use 19 thousand hours to 20 thousand hours before the replacement of the seat plate two, steel ball can continue to use, and the overhaul cost is only the chip valve 1/10., set BB reason and badger soul 2001NolO