Control method and device for automatic adjustment and marshalling operation of blower in sewage treatment plant

Abstract

The invention discloses a method and device for controlling automatic adjustment and marshalling operation of an air blower of a sewage treatment plant. The method comprises the steps that the air regulation of a single air blower is automatically controlled according to the adjustable value of the air demand of an aerating system; whether a fan needs to be started and stopped is judged accordingto the oxygen uptake rate OUR of activated sludge and the adjustable value of the air demand of the aerating system; and air blower starting and stopping are intelligently protected, and safety operation of the air blower is guaranteed. According to the method, starting and stopping of the air blower is comprehensively judged through the oxygen uptake rate OUR of the activated sludge and the air demand of the aerating system, the blast capacity of an adjustable air blower and a discontinuous air regulation air blower can be automatically controlled, and the defect of existing continuous air adjustment is overcome. Step control of air regulation of the air blower is achieved, safety operation of the air blower is protected, and therefore the reliability and applicability of air blower control are effectively improved.

Description

technical field [0001] The invention relates to the technical field of urban sewage treatment, in particular to a control method and device for automatic adjustment and marshalling operation of blowers in sewage treatment plants. Background technique [0002] With the continuous improvement of effluent water quality requirements and self-control level of sewage treatment plants, more and more sewage treatment plants have begun to pay attention to and use aeration control systems to achieve stable control of dissolved oxygen and stable effluent water quality through automatic control. [0003] At present, the mainstream application of aeration control system mainly includes "dissolved oxygen-air volume" feedback control, "dissolved oxygen-ammonia nitrogen" feedback control, "feedforward-feedback" control, etc. The core means are based on the dissolved oxygen in the aerobic area of ​​the biological pool. Target value, dynamically adjust the air volume of the aeration branch pi...

AI Technical Summary

Problems solved by technology

The use of MCP cabinets to realize fan marshalling control technology has the following disadvantages: 1) At present, MCP can only handle fans of the same specification, and cannot coordinate fans of different specifications, let alone fans of different types. In the production process, it is often necessary to adjust different specifications, or even different different types of fans, or a mix of adjustable and non-adjustable fans; 2) At present, MCP is based on the assumption of fans of the same specification, and its algorithm can only process and output continuously changing air volumes. Oscillating back and forth and repeated adjustments in the breakpoint area

3) At present, MCP only processes the air volume signal and does not consider the influent load of the biochemical unit. The adjustment action does not include the dynamics of the biological reaction process. The air volume adjustment fan is easy to be adjusted incorrectly or wrongly adjusted due to too many coupling loops

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