Control method for preventing parallel running fans from tacking phenomenon

A control method and fan technology, applied in pump control, separation method, machine/engine, etc., can solve problems that endanger the operation safety of boiler units, endanger the safety of fan equipment, and the life of fan blades, and achieve a smooth switching process
CN106861407AInactive Publication Date: 2017-06-20SHANGHAI LONGKING ENVIRONMENTAL PROTECTION
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
SHANGHAI LONGKING ENVIRONMENTAL PROTECTION
Publication Date
2017-06-20
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a control method for preventing parallel running fans from tacking phenomenon. The method comprises the following steps: adopting a pressure difference transmitter for measuring pressure difference at outlet and inlet of each fan; performing subtraction on the measured pressure difference signal values of the two fans; applying an operation result to a regulation control loop for an opening degree of a baffle of each fan; and under the conditions that no correction function is executed when a single fan runs and each pressure difference signal and the smoke volume passing by each fan are in direct proportion to each other when the two fans run, correcting the regulation control loop for the opening degree of the baffle of the fan by the operation result of the pressure difference signal subtraction according to different directions and strengths, maintaining the equal smoke volume passing by each fan as far as possible and balancing the fan running, and meanwhile, receiving a boiler furnace negative pressure regulation instruction by the regulation control loop for the opening degree of the baffle of the fan, thereby synchronously acting according to the boiler furnace negative pressure regulation instruction and reducing the influence on the running safety of the boiler.
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Description

technical field

[0001] The present invention relates to the technical field of thermal control, and in particular to a control method for avoiding wind grabbing of fans running in parallel, specifically to the desulfurization fans running in parallel in the limestone (or lime) wet sulfur dioxide removal process Control Method. Background technique

[0002] Limestone (or lime, the same below) wet desulfurization technology is currently widely used in the flue gas treatment system of coal-fired boilers to remove the environmentally harmful component SO in the flue gas 2 . In this technology, the flue gas discharged from the coal-fired boiler is guided to the middle of the desulfurization tower through the desulfurization fan, and then flows upward after entering the desulfurization tower, and meets and scrubs with the limestone slurry that falls from the nozzle arranged on the upper part of the desulfurization tower. , SO in flue gas 2 Chemically react with limestone to fin...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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