A Roots blower control system for controlling biogas automatic pressurization device

Abstract

The invention discloses a roots blower control system for controlling a methane automatic pressurizing device. The roots blower control system comprises a frequency converter, a pressure transmitter, a radiating fan used for radiating, a roots blower and a control circuit, wherein a first key switch is connected between a first end pin and a second end pin of the frequency converter; the pressure transmitter is connected between a third end pin and a fourth end pin of the frequency converter; a fifth end pin is connected with a sixth end pin of the frequency converter; a seventh end pin is connected with an eighth end pin of the frequency converter; a ninth end pin of the frequency converter is grounded; a pressure sensor is arranged on the pressure transmitter. The invention has the beneficial effects that the frequency converter and the pressure sensor are used for controlling the roots blower of the methane automatic pressurizing device; when air pressure is low, the roots blower controlled by the frequency converter runs by increasing the frequency; when air pressure reaches the upper limit, the roots blower controlled by the frequency converter runs by reducing the frequency; the running at constant rotating moment of the roots blower is ensured all the time; the pressure of the air tank is kept constant; the structure is simple; the practicability is strong.

Description

technical field [0001] The invention relates to the field of biogas control, in particular to a Roots blower control system for controlling a biogas automatic pressurization device. Background technique [0002] At present, large, medium and small biogas digesters, regardless of the structure and material changes, generally have anaerobic fermentation tanks and gas storage tanks at the same time, in order to realize the functions of gas production and gas storage, and under the condition of applying external air pressure In order to meet the requirements of normal use. Its structure is complex, it occupies a large area, and its cost is high. [0003] Roots blower is a positive displacement blower. In industrial production, it can be used for pneumatic conveying of materials, and can also be used to provide constant pressure pulse air flow. When providing constant pressure pulsating airflow, when the air pressure reaches or exceeds the set value, the pressure relief valve o...

AI Technical Summary

Problems solved by technology

When providing constant pressure pulsating airflow, when the air pressure reaches or exceeds the set value, the pressure relief valve of the Roots blower will actively open, and the exhaust will reduce the pressure to maintain the provided airflow pressure in a constant range. The existing Roots blower The unit control system generally adopts throttle valve flow control or frequency conversion speed regulation flow control system, the former has high energy consumption and the latter has high equipment cost

[0004] The traditional biogas automatic pressurization device uses a pressure switch to control the air pressure. When the air pressure is lower than the lower limit, the pressure switch is closed, and the Roots blower starts to inhale. When the pressure reaches the upper limit, the pressure switch is disconnected. The Roots blower will stop sucking air. If the air pressure is low, the Roots blower will start to suck; but the pressure of the gas tank cannot guarantee a constant pressure and cannot meet the use requirements.

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