A full water supply control system suitable for deep peak regulation of coal-fired units
A control system and coal-fired unit technology, applied in the control of water supply, lighting and heating equipment, steam generation, etc., can solve the problems of long operation period, improper opening/closing selection timing, complicated operation, etc., and achieve high automatic adjustment accuracy, Avoiding the phenomenon of rushing water and improving the effect of operation safety
Active Publication Date: 2022-04-08
扬州第二发电有限责任公司
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Problems solved by technology
[0006] (1) The automation level of the water supply system of most coal-fired units is low;
[0007] (2) Each single operation of the water supply system needs to be carried out one by one, and the operation is complicated, resulting in a long overall operation cycle;
[0008] (3) The operation mode of the feedwater pump changes, and the parallel and withdrawn operations of the feedwater pumps cannot be automatically controlled, and manual operation is required. If the response is not appropriate, it is very easy to cause water grabbing between the two steam-operated feedwater pumps, and even the feedwater pump trips;
[0009] (4) The opening / closing timing of the recirculation valve of the pre-pump and the recirculation valve of the steam-driven water pump is improper, which will easily cause fluctuations in the flow and pressure of the feed water, affecting the operation safety of the unit
Method used
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[0047] figure 1 It is a coal-fired unit feedwater thermal system applicable to the deep peak-shaving working conditions of the present invention. The outlet of the deaerator 1 is connected to the feedwater flowmeter 3, the front pump 4 and the steam-driven feedwater pump 5 in sequence, and the outlet of the steam-driven feedwater pump 5 is divided into There are two routes, one returns to the deaerator 1 through the feed water pump recirculation valve 8, and the other is output through the outlet valve 6; an inlet valve 2 is set between the feed water flow meter 3 and the deaerator 1, and the front pump 4 outlets the feed water It can be returned to the deaerator 1 through the pre-pump recirculation valve 7. The inlet of the front pump recirculation valve 7 is connected with the outlet of the front pump 4 , and the outlet of the front pump recirculation valve 7 is connected with the deaerator 1 . The inlet of the feedwater pump recirculation valve 8 is connected with the outl...
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A full water supply control system suitable for deep peak regulation of coal-fired units belongs to the field of automatic control of clean and efficient coal-fired power generation. The present invention automatically adjusts the water supply throughout the whole process, and provides two operating modes when the 30% rated power is deep peak shaving. Mode 1 is for two steam-driven water supply pumps to run in parallel; mode 2 is for one steam-driven water supply pump to automatically adjust the water flow. , and the other steam-driven feed water pump is in recirculation hot standby operation state. In the present invention, the parallel and withdrawn control of feed water pumps (including the full automatic operation of hot standby operation) uses the concept of knowledge-based operation procedures and model-based expert experience, adopts the optimization combination of related operations, and realizes the control strategy of phase-to-phase operations in the same direction. Water supply is fully automatic control. The whole process water supply control system improves the safety and reliability of unit operation, replaces manual operation, and avoids the possibility of misoperation by operators.
Description
technical field [0001] The invention relates to a full water supply control system suitable for deep peak regulation of a coal-fired unit, improves the operational flexibility of the unit to adapt to power grid scheduling, and belongs to the field of automatic control of clean and efficient coal-fired power generation. Background technique [0002] Renewable energy represented by wind power and solar power is developing rapidly, but its output power is random, intermittent and unstable, which puts forward higher requirements for load control and flexible operation of the power grid. Therefore, major domestic power grids require large-scale peak-shaving operation of thermal power units on the power source side, and compensating for double random disturbances on the power source side and the load side of the power grid is an effective measure to alleviate and solve this contradiction. At present, most thermal power unit units usually operate in the range of 50-100% conventiona...
Claims
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IPC IPC(8): F22D5/32
CPCF22D5/32
Inventor 盛澍郭勇龚峻靳允立殷志龙曹晨杨凯翔管宇群高雪峰金其森徐有俊王毅唐军彭献永
Owner 扬州第二发电有限责任公司