Method and system for preventing fan from surging
An anti-surge and fan technology, applied in mechanical equipment, machine/engine, pump control, etc., can solve problems such as complex implementation, high operating cost, and complex system design, and achieve improved work efficiency, low operating cost, and reliability high effect
Active Publication Date: 2011-07-27
GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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Problems solved by technology
[0005] Since the current fan anti-surge system needs to add new process equipment or change the process flow, it has the disadvantages of complex system design, complex implementation, and high operating costs.
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Embodiment Construction
[0032] In order to make the present invention easier to understand, the present invention will be further described below in conjunction with the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention.
[0033] Such as figure 1 As shown, Embodiment 1 of the present invention provides a fan anti-surge method, including the following steps:
[0034] 101. The pulse statistics module counts the number of coal mill trips within a period of time;
[0035] 102. The judgment and correction module outputs the correction value of the fan blade opening according to the functional relationship according to the statistics of the number of coal mill trips;
[0036] 103. The adjustment control module returns the output holding value of the regulator immediately before the coal mill trips;
[0037] 104. The adjustment control module superimposes the output maintenance value of the regulator and the correction value of the fan blade opening, o...
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The invention relates to a method for fan anti-surge, which comprises the following steps: a. a pulse statistical module counts the number of tipping coal grinding mills over time; b. a judgment amendment module outputs the opening correct valve of movable vanes of the fan according to the accounted number of the tipping coal grinding mills and functional relations; c. a regulation control modulereverses the output retention valve of an adjustor in the instant before the tipping of the coal grinding mills; d. the regulation control module superposes the output retention valve of the adjustorand the opening correct valve of movable vanes of the fan, outputs the opening control commands of the fan and controls the opening of the movable vanes of the fan. The method turns down the opening of the movable vanes of the fan only by detecting the number of tipping coal grinding mills in the condition of without adding processing equipment and changing process flow, ensures the working pointof the fan to be outside a surging line and quickly and effectively prevents the surging of the fan, and has high reliability. The invention also discloses a fan anti-surge system.
Description
technical field [0001] The invention relates to a method and system for preventing surge of a fan, in particular to a method and system for preventing surge of a primary fan of a boiler. Background technique [0002] The primary fan of the boiler is mainly used to provide the air required for the coal mill to dry and transport the pulverized coal, and at the same time provide the air supply for the pulverized coal to enter the furnace for the initial stage of ignition. When the coal mill itself trips or the coal mill trips due to the blower fan, induced draft fan, and water pump, the coal mill trips and interlocks to close the coal mill hot air baffle and hot air regulating door, and the air duct resistance of the fan suddenly increases, resulting in Rapid flow oscillation and pressure oscillation, sudden increase in air duct resistance, steepening of pipe network characteristics, leftward shift of the fan operating point, and deviation from the fan operating point, resultin...
Claims
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IPC IPC(8): F04D27/00
Inventor 黄卫剑叶向前朱亚清
Owner GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD