One-button whole-process automatic control method for supercritical once-through boiler feed water
A once-through boiler and supercritical technology, applied in the control of water supply, lighting and heating equipment, steam generation, etc., can solve the problems of reducing unit stability, complex judgment and control, and easy misoperation
Active Publication Date: 2021-09-10
LIAONING DONGKE ELECTRIC POWER
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Problems solved by technology
When the boiler load is greater than 30% BMCR, the feedwater bypass regulating valve needs to be switched to the main water supply circuit. After the switch is completed, the feedwater flow is completely controlled by the electric feedwater pump. When the boiler load is greater than 50% BMCR, the output of the electric feedwater pump is insufficient. Switch to steam-driven The feed water pump feeds water. After the pump is switched off, the feed water flow is controlled by the steam feed water pump. When the electric feed water pump controls the feed water flow when the unit is reducing load or preparing to stop, it is necessary to switch from the steam feed water pump to the electric feed water pump. The above is basically It is the whole process of water supply when the unit is running. When the working conditions change, it is necessary to switch between different modes of water supply control. During the switching process, the operation intensity of the operator is increased, the judgment and control are complicated, and it is easy to misuse. If the operator operates Mistakes can easily cause large fluctuations in feed water flow, which greatly reduces the stability of the unit
Method used
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Embodiment 1
[0095] according to Figure 2 to Figure 12 The SAMA diagram in the system can be used in any DCS control system of all units for logic configuration using the system's own function blocks to complete the full automatic control of water supply with one key. The specific method is as follows:
[0096] (1) will Figure 2 to Figure 11 The input points in the SAMA diagram are replaced by the unit engineering actual parameter variable points, equipment status points and reference points of the corresponding identification numbers in the SAMA diagram;
[0097] (2) According to the actual project, replace the output points of the water supply bypass adjustment door, electric pump scoop tube and steam pump control output command.
[0098] (3) On the human-computer interaction screen, make the button of "one key water supply full automatic control input" and "one key water supply full automatic control exit" button respectively link to Figure 4 The P1 and P2 buttons in the function ...
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A one-button whole process automatic control method for supercritical once-through boiler feed water. The concept of one-key automatic control of water supply is to automatically determine the control mode suitable for the current working condition of the unit through the current operating status of the water supply control equipment of the unit and related parameters. When the one-key automatic control is activated, the corresponding control mode is automatically activated. In the whole control process, 4 breakpoints are designed according to the different operating conditions of the unit, which are one-key switch from water supply bypass to main road, one-key switch to steam pump feed water, one-key switch to electric pump feed water, and water supply main road to bypass Switch with one click. The present invention solves the automatic adjustment and control of the whole process of boiler ignition, steam turbine running, generator grid connection, unit load and unit shutdown through the above method, and realizes one-button automatic control.
Description
technical field [0001] The invention belongs to the field of boiler feedwater automatic control, and in particular relates to a one-button whole-process automatic control method for supercritical once-through boiler feedwater. Background technique [0002] At present, some designs of water supply equipment for 350MW supercritical DC thermal power units consist of a steam-driven feedwater pump with 100% MCR output and an electric feedwater pump with 50% MCR output. The feed water flow is jointly controlled by the electric feed water pump and the feed water bypass regulating valve. When the boiler load is greater than 30% BMCR, the feedwater bypass regulating valve needs to be switched to the main water supply circuit. After the switch is completed, the feedwater flow is completely controlled by the electric feedwater pump. When the boiler load is greater than 50% BMCR, the output of the electric feedwater pump is insufficient. Switch to steam-driven The feed water pump feeds...
Claims
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IPC IPC(8): F22D5/32
CPCF22D5/32
Inventor 许淼叶振起魏来徐岩赵奕州奇云峰丁永允曲洪雄吴尚泽
Owner LIAONING DONGKE ELECTRIC POWER