Control system and method for energy-saving optimizing operation of vacuum belt dehydrator

Abstract

The invention discloses a control system and method for energy-saving optimizing operation of a vacuum belt dehydrator. The system comprises the vacuum belt dehydrator. A vacuum chamber is installed below a dehydration belt of the vacuum belt dehydrator, the vacuum chamber is connected with a water-ring vacuum pump, a vacuum pump motor is controlled by a frequency converter, the frequency converter is capable of, through changing the power of the vacuum pump motor, enabling the vacuum chamber to form different vacuum degrees. The control method matched with the system comprises the following steps: sending the thickness of gypsum measured by an ultrasonic thickness gauge and the vacuum degree of the vacuum chamber measured by a pressure transmitter to a DSC system through an electric signal, analyzing the received electric signal by the DSC system and performing the PID control on the frequency converter, and changing the vacuum degree of the vacuum chamber through changing the outputpower of the vacuum pump motor. The beneficial effects of the control system and method are that a frequency conversion design is used in the water-ring vacuum pump motor with the larger operating power, the energy consumption of a dehydration system is greatly reduced, and the purpose of the energy-saving optimization of the dehydration system is realized.

Description

technical field [0001] The invention relates to the field of vacuum belt dehydrators, in particular to a control system and method for energy-saving and optimized operation of vacuum belt dehydrators. Background technique [0002] The "Coal Power Energy Conservation and Emission Reduction Upgrading and Transformation Action Plan (2014-2020)" requires that the emission concentration of air pollutants from newly built coal-fired generating units basically reach or approach the emission limit of gas turbine units (that is, under the condition of a reference oxygen content of 6%, smoke, dust, The emission concentrations of sulfur dioxide and nitrogen oxides are not higher than 10, 35, and 50 mg / m3 respectively). In order to meet this standard, coal-fired power plants have generally carried out ultra-low emission transformation. Among desulfurization technologies, limestone-gypsum wet desulfurization has been widely used due to its mature technology, high desulfurization efficien...

AI Technical Summary

Problems solved by technology

[0006] 1) The rated power of the driving motor is small, and the energy saving potential brought by frequency conversion is not great

The power of the vacuum pump motor is very large, generally more than ten times the power of the driving motor. However, in the actual dehydration process, the vacuum pump motor always maintains the rated power operation, which consumes a lot of energy, and cannot automatically adjust the output according to the working conditions, so that the dehydration system consumes a lot of energy. Huge energy, not conducive to energy-saving operation

[0007] 2) The vacuum pump motor maintains high power operation and high vacuum for a long time, and it is easy to be overloaded due to excessive current, causing hidden dangers in the operation of the gypsum dehydration system

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