Intelligent control system for gas-fired air heaters

Abstract

The invention relates to an intelligent control system for gas-fired air heaters and aims to provide an intelligent control system low in cost and allowing accurate control. The intelligent control system comprises a PLC (programmable logic controller) system with a human-machine interface; the PLC system comprises an air temperature control system and a PID (proportion integration differentiation) process control module. The air temperature control system comprises a temperature detector, a gas flow control system and an air intake control system. The gas flow control system is connected to a gas flow valve and used for controlling gas flow. The air intake control system is connected to an intake valve disposed at an air inlet of a gas-fired air heater and used for controlling air intake. The temperature detector is disposed at an air outlet of the gas-fired air heater and used for detecting temperature of discharged air. The PLC system is internally provided with a temperature control program. Therefore, according to information input through the human-machine interface, the system automatically calculates parameters and controls corresponding valve actions, thereby precisely controlling the air temperature; the system is low in cost, simple to operate and suitable for popularization.

Description

technical field [0001] The invention belongs to the technical field of hot blast stove control for drying, and in particular relates to an intelligent control system for a gas hot blast stove. Background technique [0002] In the production process of food, Chinese herbal medicine and other products, drying is required, usually by drying or artificially blowing hot air, and the production efficiency of artificially blowing hot air is obviously higher, so it is adopted by most manufacturers. Most of the existing hot blast blowing devices use hot blast stoves to produce hot blast at a suitable temperature. [0003] The existing hot blast stove produces heat through the burner, and generates hot air through the heat exchange between the cold air and the heat exchange cylinder. Due to factors such as unstable air flow, insufficient gas combustion, and gas quality, the temperature of the hot blast coming out of the hot blast stove will appear. Fluctuation is not conducive to the...

AI Technical Summary

Problems solved by technology

[0004] The existing hot blast stove automatic control systems are mainly used for blast furnace hot blast stoves with very high temperature requirements. These control systems are too costly to control hot blast stoves with low temperature requirements such as drying grain and medicinal materials. At the same time, these control systems The control system is very complicated and not suitable for promotion, so it is urgent to reduce the cost of the hot blast stove control system

Images