Sequential control method for whole plant steam trap sets of thermal generator set

Abstract

The invention discloses a sequential control method for whole plant steam trap sets of a thermal generator set. Low-pressure main-steam steam trap set control specifically comprises drainage in front of low-pressure main steam parallel valves of a first machine and a second machine, drainage in front of low-pressure main steam bypass valves of the first machine and the second machine and drainage in front of a low-pressure steam supplementing valve group; residual furnace steam trap set control specifically comprises control over a first residual furnace superheater steam trap set and a second residual furnace superheater steam trap set and control over a first residual furnace header steam trap set and a second residual furnace header steam trap set; and high-pressure main steam trap set control specifically comprises extraction condensing machine high-pressure main steam valve front drainage, extraction condensing machine electric main steam valve front drainage, first machine or second machine high-pressure main steam parallel steam valve front drainage, first machine or second machine high-pressure main steam bypass front drainage, high-pressure main steam main pipe drainage, back pressure machine inlet electric valve front drainage, high-pressure main steam to high (low) pressure temperature and pressure reducer drainage, and first machine or second machine high-pressure main steam outlet drainage. The sequential control method has the technical effect of distinguishing the starting states (cold state and hot state) and running safety of units.

Description

technical field [0001] The invention relates to the technical field of thermal power generating sets, in particular to a sequential control method for steam traps in the whole plant of thermal power generating sets. Background technique [0002] During the start-up process of the unit, as the steam heats up and pressurizes, it will exchange heat with the steam pipe. When the temperature of the steam pipe is lower than the steam temperature, the steam temperature decreases and the degree of superheat decreases; when the steam temperature is lower than the current pressure saturation temperature Condensed water will be produced, driven by the high-speed flowing steam, the condensed water will be strongly impacted on the pipe wall, valves and steam-using equipment, resulting in damage or destruction of the pipe turning, valves and steam-consuming equipment, and severe condensation Water will enter the steam turbine along with the steam and damage or even break the blades. Ther...

AI Technical Summary

Problems solved by technology

[0006] 1. The logic in the steam trap does not distinguish the starting state of the unit (cold state, hot state);

[0007] 2. According to the switch logic of the existing steam trap, it will be found that the superheat is opened at 17°C and closed at 21°C. The drainage cannot be sufficient, and a large amount of water will accumulate in the pipeline, causing potential safety hazards; 3. The switch logic of the existing trap only considers The degree of superheat does not take into account whether the steam is circulating, and there are potential safety hazards; 4. There is only one superheat measurement point in the main steam pipeline, and operators need to manually compare the saturation temperature under the current pressure at the steam trap, which is cumbersome to operate; 5. Due to the current The logic is unreasonable, and the trap switch is manually operated by the operator, which may cause insufficient or excessive drainage, which will affect the safe and economical operation of the unit