Height and low plus dangerous dredging control method

A control method and dangerous dredging technology, applied in the direction of controlling water supply, lighting and heating equipment, preheating, etc., can solve problems such as valve leakage, frequent switching, affecting the safety and economy of the unit, so as to reduce blowing loss and ensure tightness Sex, the effect of avoiding staying

Active Publication Date: 2017-04-12
广东红海湾发电有限公司
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  • Description
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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

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  • Height and low plus dangerous dredging control method

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Embodiment Construction

[0016] Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements.

[0017] The present invention takes the distributed control system (DCS) as an example to describe in detail the specific implementation process of the heater emergency control method of the present invention. Among them, the decentralized control system includes No. 1, 2, 3, 5, and 6 heaters, and each heater corresponds to a critical drain gate and a critical drain gate, and the two ends of the emergency drain gate are respectively connected to the heater and the emergency drain gate. In front of the tune. However, the emergency drain valves corresponding to No. 1, 2, and 3 heaters are high-intensity emergency drain valves, and the emergency drain valves corresponding to No. 5 and No. 6 heaters are low-intensity emergency drain valves.

[0018] Please refer to figure 1 , the control method of the present invention compr...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22D5/00
Inventor 朱军张春生袁宏伟王晓晖
Owner 广东红海湾发电有限公司
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