Height and low plus dangerous dredging control method

Abstract

The invention discloses a high-low pressure heater emergency drain control method which is applicable to a distributed control system. The distributed control system comprises a heater, a high-pressure heater emergency drain control valve, a low-pressure heater emergency drain control valve and an emergency drain control valve front valve. In particular, the control method includes the steps that an adjusting deal zone is arranged in the valve control logic of the high-pressure heater emergency drain control valve and the low-pressure heater emergency drain control valve, the emergency drain control valve front valve is set to be an electrically operated gate, and the control logic of the electrically operate gate is added. Compared with the prior art, the adjusting deal zone is arranged in the valve control logic of the high-pressure heater emergency drain control valve and the low-pressure heater emergency drain control valve, so that stay of the valves at the small opening is avoided, the blowing loss of valve elements is reduced, inner leakage of the valves is reduced, and blowing loss and leakage of the emergency drain valve bodies are reduced; meanwhile, the emergency drain control valve front valve is set to be the electrically operated gate, and the control logic of the electrically operate gate is added, so that the airtightness of the emergency drain control valves is guaranteed, and the safety and economy of a unit are improved.

Description

technical field [0001] The invention relates to the technical field of thermal power generation, and more particularly relates to a method for controlling height, height, and danger. Background technique [0002] Due to the peak-shaving operation of thermal power units, the unit load changes frequently. When the load of the unit drops significantly and the RB working condition, the high water level of the heater in the decentralized control system (DCS) fluctuates more, which will cause the small opening fluctuation of the high water emergency valve. The high-pressure and critical drain valve is followed by the high vacuum of the condenser. Under such frequent fluctuations in the small opening, the rapid vaporization bubbles of the water-repellent will burst and impact, which will easily cause the valve of the high-pressure and critical drain valve to be eroded, resulting in the Internal leakage of the valve affects the safety and economy of the unit. [0003] For this rea...

AI Technical Summary

Problems solved by technology

[0004] However, this method will still make the high-low and emergency drain valve open and close frequently when the opening is small, so after long-term peak-shaving operation, the valve of the valve will have serious leakage, which seriously affects the safety and security of the unit. economy

Images