Steam turbine chamber and cause analysis of oil smoke spray bearing box and processing

1. No. 3 steam turbine oil system overview of jiaozuo power plant no. 3 machine series produced by dongfang N200 - In 1999, 130/535/535 type steam turbine, has carried on the transformation and adjustment system on flow passage DEH reconstruction. The original design of the oil system of the traditional dc drive the main spindle oil pump - shot oiler system, adjust the security systems provided directly by the main oil pump, oil bearing oil supply by firing oil, shoot oiler also directly to the independent power oil pump. The main oil pump oil into two road, all the way to adjust the security system, all the way to shoot the oiler, two shot oiler in parallel, a fuel supply to the lubrication system, an import oil supply to the main oil pump. DEH after modification, the main oil pump to adjust security system along the way is only for mechanical oil crisis breaking security part, main steam valve and control valve control oil by a separate high pressure fuel supply system. In various bearing oil inlet is equipped with the throttling orifice plate bearing lubricating oil quantity control. The bearing and the adjustment of the oil return through the bearing box and oil return pipe flow back to the main tank. In the box before the oil return Shared a mother oil return pipe, the rest of the bearing oil return share an oil return pipe. Oil return pipe has a slope of a gradual decline in the direction of the tank, inside oil return half full of state, to facilitate the lampblack of the bearing box by space on the surface of the oil flow to the tank, then through smoke exhaust fan. The engine oil system configuration two smoke exhaust fan, exhaust system for bearing maintain - in the box 10 ~ - 20 mm water column of the negative pressure is preferred. 2, chamber, and bearing in jiaozuo power plant no. 3, the positive pressure in the cabinet to take lampblack machine box and bearing in the positive pressure in the cabinet before take lampblack is serious, due to the former in the box and bearing box located in the high temperature of the steam turbine, from lampblack immersed within the cylinder bearing is close to the location of the heat preservation, the product oil more than one, change of operation condition, and the easy to fire. In the actual production of bearing box at both ends have been on fire. In the normal operation of the unit, in the process of oil and gas often irregularly, intermittently from bearing box automatic platoon lampblack hole suddenly overflowing, and sometimes due to other causes high temperature, out of oil and gas combustion become a dragon, to patrol staff personal safety and the safety of equipment operation. After investigation, from the second half of 2002 to May 2003, no. 3 machine during the minor repair for months, fire-breathing number of dozens of times. 3, before the box and the bearings in the analysis of the causes of high positive pressure forming the box and the bearings in exhaust reasons is the root cause of the positive pressure forming, and form the smoke machine for 3 analysis of the main factors are as follows: ( 1) Main tank oil level is high, make the lube oil baffle the accumulation in the air, causing the oil smoke poorly. We through investigation and comparison, and other units, in the actual operation, the main fuel tank oil level control in 50 ~ 330 mm, used to control in about 160 mm, and stipulations in the design of the instruction. But in the debug unit the main tank oil level, only to find that reduce the main tank oil level can effectively reduce the higher the positive pressure in the cabinet. When the main fuel tank oil level descended into the chamber and the bearing box oil baffle box (mouth In addition to