Primary air fan stalling prevention method in primary air system
A prevention method and technology for secondary fans, applied in general control systems, control/regulation systems, computer control, etc., can solve problems such as deterioration, poor reliability, and prone to stalling.
Active Publication Date: 2017-09-29
ZHEJIANG ZHENENG ZHONGMEI ZHOUSHAN COAL & ELECTRICITY CO LTD +1
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Problems solved by technology
), the trip coal mill quickly closes the cold and hot primary air and quickly closes the baffle, and the primary air pressure rises rapidly, making it more likely to stall
Severe fan stalls will endanger the safe operation of the unit. Power plants usually use stall probes and differential pressure switches to judge stall signals, which have poor reliability; stalls have the characteristics of rapid deterioration during operation, and it is difficult for operators to take early measures. measure
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[0028] The present invention will be further described below in combination with specific embodiments and accompanying drawings.
[0029] Such as figure 1 As shown, the present invention is a method for preventing the stall of the primary fan in the primary air system. wind system.
[0030] The method for preventing the stall of the primary fan in the primary air system of the present invention comprises the following steps:
[0031] Step 1: Obtain and store the critical stall parameters of the fan obtained through manufacturer's information or field tests. The critical stall parameters are multiple (rotor blade opening O, critical stall flow Q, critical stall pressure P) vector samples, respectively perform cubic spline interpolation on O-Q, O-P, Q-P, Q-O, P-O, P-Q, and obtain the cubic spline function fOQ, fOP, fQP, fQO, fPO, and fPQ are respectively used to calculate the stall flow rate at a constant opening, the stall pressure at a constant opening, the stall pressure a...
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The invention discloses a primary air fan stalling prevention method in a primary air system. Safety intervals of a regulating valve, a shut-off valve, a resistance parameter and an air fan parameter of the primary air system are successively and integratedly calculated in real time and over-range alarm is generated. Under a current operation mode and an operation condition, changes of each main regulating valve, the shut-off valve, the resistance parameter and the air fan parameter of the system in the safe intervals does not cause stalling of any one air fan. And if the changes exceed the safe intervals, air fan stalling may be generated and an alarm is generated too so as to prompt operation personnel to take corresponding measures in advance or predict an accident. The operation personnel observes the safe intervals of the regulating valve, the shut-off valve and the air fan parameter in the primary air system in real time and positions of the parameters in the safe intervals so as to calmly carry out corresponding operation. Through observing the position of the resistance parameter in the safe interval in real time and timely carrying out the corresponding operation, correlation equipment performance can be improved.
Description
technical field [0001] The invention relates to the technical field of fan detection, and more specifically relates to a method for preventing stall of a primary fan in a primary air system. Background technique [0002] The primary fan is to provide primary air with a certain pressure and a certain flow rate to dry the pulverized coal and send it to the burner to provide the heat required for the volatilization and combustion of the pulverized coal. The primary fan is composed of a motor, an impeller, a casing, an air intake box, a current collector, a base, and an adjustment control system. In a large-capacity thermal power generation unit, the primary air system usually uses two axial-flow primary fans with adjustable blades to operate in parallel, which can adapt to a wide range of unit load adjustments while maintaining high fan efficiency. [0003] In a thermal power generation unit, the primary air is usually divided into two paths: one path is heated by the air preh...
Claims
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Login to View More IPC IPC(8): G05B19/048
CPCG05B19/048
Inventor 陈统钱范海东朱继峰李彦猛章军人胡伯勇戴敏敏应立峰邵海雷卓鲁锋陈溪松曾天成陈言
Owner ZHEJIANG ZHENENG ZHONGMEI ZHOUSHAN COAL & ELECTRICITY CO LTD