Multi-boiler drum liquid level header system energy-saving water supply system and control method thereof

Abstract

The invention discloses a multi-boiler drum liquid level header system energy-saving water supply system and a control method thereof. The system comprises at least two sets of boiler liquid level systems for supplying water through the same header, a water feeding control valve of each set of boiler liquid level system is controlled through a three-impulse control system, the opening values of all the water feeding control valves are provided for a valve opening control system in a unified mode, the valve opening control system conducts control according to the maximum valve opening set value, and the water inlet amount of the header is automatically controlled. The multi-boiler drum liquid level header system energy-saving water supply system and the control method thereof have the advantages that the water inlet amount of the header is dynamically adjusted so that the water feeding control valve reaching the maximum set opening can be adjusted to the proper opening, the problem of potential safety hazards cannot be caused for the boiler with the maximum water feeding control valve opening, and a feed pump in a multi-boiler system can work in the optimal energy-saving state.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to an energy-saving water supply control system and a control method for multi-boiler steam drum liquid level master control. Background technique [0002] In the multi-boiler main control water supply system, the drum liquid level of each boiler is controlled by its own three-impulse (drum liquid level, load steam flow, feed water flow) system for production and operation control. The opening of the feed water control valve is the main measure of energy loss. index. Since the load steam flow of each boiler is different, the opening of each boiler feed water valve is also different. The smaller the opening of each boiler feed water control valve, the greater the throttling loss of the main control feed water pump. [0003] Theoretically, the larger the valve opening of the largest feed water control valve in the multi-boiler master control water supply system, the less th...

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Problems solved by technology

Since the load steam flow of each boiler is different, the opening of the feed water valve of each boiler is also different. The smaller the opening of the feed water control valve of each boiler, the greater the throttling loss of the feed water pump of the main pipe.

[0003] Theoretically, the larger the valve opening of the largest feed water control valve in the multi-boiler master control water supply system, the less the throttling energy loss of the regulating valve, but if the valve opening of the largest feed water control valve is too large, it will affect the safety of the system. If the steam flow rate of the system suddenly increases when the water supply control valve is opened too much, there is no further adjustment margin, which will cause the liquid level of the steam drum to drop sharply, which will cause safety problems such as dry pot

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