Intelligent control method for temperature in kiln of gas industry

Abstract

The invention discloses an intelligent control method for the temperature in a kiln of the gas industry. According to the method, precise control over the temperature in the kiln is achieved by performing closed-loop control on an electric proportional valve. Collected temperature values are converted into current values by a thermocouple temperature sensor first, the current values are input to akiln controller, an AD conversion module in the controller converts current analog signals into digital signals, and the opening degree of the electric proportional valve is controlled according to acorresponding relationship between the temperature values and the current values in a thermometer; an incremental PID control module with a dead zone is adopted, a deviation value between a preset temperature value of the kiln and a current temperature sampling value is used as an input value of PID control, and the pulse width value of PWM is adopted as an output value of the PID control; the opening degree of the electric proportional valve is controlled according to the positive or negative pulse width value. Automatic and precise control over the temperature of the kiln is achieved through the electric proportional valve, the interference of human factors on the quality of products is reduced, and an intelligent industrial control effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of control, and relates to an intelligent control technology for the temperature in a kiln, especially to apply this temperature control method to a batch kiln represented by a shuttle kiln that uses gas in industry, so as to achieve The effect of intelligently controlling the temperature in the furnace. Background technique [0002] The gas-fired industrial furnace is a thermal equipment that uses gas as a heating material in the industrial production process to complete physical and chemical changes. [0003] At present, the commonly used gas-fired industrial kilns can be divided into batch kilns represented by shuttle kilns and continuous kilns represented by tunnel kilns and roller kilns. The operation of the tunnel kiln and the roller kiln is continuous, and its production output is large and the finished products are many, but the construction cost of the tunnel kiln and the roller kiln is high. The ...

AI Technical Summary

Problems solved by technology

The operation of tunnel kiln and roller kiln is continuous, its production output is large and the finished products are many, but the construction cost of tunnel kiln and roller kiln is high

The shuttle kiln can be fired intermittently. One kiln is fired once. It is characterized by strong flexibility. Different firing processes can be selected according to different products. One kiln can fire a variety of products, so the shuttle kiln The kiln has strong adaptability in the production of the kiln firing industry, but the shuttle kiln is more complicated in the kiln temperature control

The internal space environment of the kiln has complex changes. Each firing is a process of heating up, keeping warm, and cooling down the entire kiln, which increases the difficulty of temperature control in the shuttle kiln.

In terms of kiln temperature control, many small and medium-sized enterprises are still in the stage of simple instrumentation and manual operation, which lacks scientificity and affects the stability of product quality

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