VOCs waste gas flow control method of fuzzy neural network PID based on heat balance feedback

Abstract

The invention relates to a VOCs waste gas flow control method of a fuzzy neural network PID based on heat balance feedback. The method comprises the following steps that an error between a VOCs waste gas flow set value and an actual output value and an error change rate are subjected to fuzzy quantization and sent to a neural network, and finally, an output layer neuron of a neural network module outputs three indexes of a PID controller: proportion, integral and differential coefficients Kp, Ki and Kd, and the flow value of the VOCs waste gas is adjusted. Needed VOCs waste gas flow is obtained through heat balance calculation and fed back to input in real time, the VOCs waste gas flow is continuously compared with an actual output value and transmitted to a neural network, and accurate control is achieved. According to the VOCs waste gas flow control of the fuzzy neural network PID based on heat balance feedback, the change condition in the reactor can be quickly reflected, and the required VOCs waste gas flow is calculated according to heat balance, that is, when deviation exists between the controlled quantity and the input quantity, the deviation can be quickly reflected to the regulating valve for execution in real time through the neural network PID controller.

Description

technical field [0001] The invention relates to the technical field of VOCs exhaust gas treatment, in particular to a VOCs exhaust gas flow control method based on heat balance feedback fuzzy neural network PID. Background technique [0002] Volatile organic compounds (VOCs) are one of many substances that pollute the environment. VOCs are produced in many places in life, such as decoration materials and automobile exhaust. Also in the chemical production process, exhaust emissions and fossil fuels are the main sources of VOCs. VOCs are not only harmful to the natural ecological environment, but also very harmful to the human body. Therefore, the efficient, stable and low-energy purification treatment of VOCs has become one of the international hot research topics. [0003] VOCs exhaust gas and oxygen undergo a catalytic oxidation reaction at a certain temperature under the action of a catalyst. The final products of organic waste gas combustion are carbon dioxide and wate...

AI Technical Summary

Problems solved by technology

During operation, because the concentration of VOCs exhaust gas is intermittent, the concentration of VOCs exhaust gas is different under the same flow rate. When the concentration of VOCs exhaust gas is high, the reaction is violent and the temperature rises, which affects the safety of the device and the activity of the catalyst.

When the concentration of VOCs exhaust gas is low, the heat released by the catalytic combustion reaction is less than the heat taken away by the gas, the reaction temperature drops, the removal rate of VOCs exhaust gas decreases, and the treatment is not up to standard; while the traditional flow control method can only be simply Control the gas flow, unable to control the flow according to its concentration change

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