Electric control system of air heating furnace and control method

Abstract

The invention discloses an electric control system of an air heating furnace. The system comprises a bran room feeding control module, an empty furnace feeding module, an automatic combustion module,a first stop module and a frequency changer control module, wherein the bran room feeding control module is used for controlling fuels to enter a bran barrel; the empty furnace feeding module is usedfor controlling fuels to enter a combustion chamber; the automatic combustion module is used for controlling the fuels in the combustion chamber to be combusted automatically, and different frequencychanging control modes are set; the first stop module is used for stopping on-load operating of the electric control system; and the frequency changer control module adopts linear control modes and used for controlling the output frequency of an on-load frequency changer, and the linear control modes correspond to the frequency changing control modes set in the automatic combustion module. The invention further discloses a control method. According to the electric control system and the control method, the different control modes are selected through the frequency changer control module according to drying equipment, with different heat requirements, connected and matched with the air heating furnace, different interval adjusting modes are set, and the output heat control sensitivity and accuracy of the air heating furnace are improved; and by adopting the linear control modes, heat output of the air heating furnace can be smoothly transited, and heat output has better stability and accuracy.

Description

technical field [0001] The invention relates to an automatic electric control system, in particular to an electric control system and a control method for a hot blast stove. Background technique [0002] At present, my country's grain dryers use coal and oil as heat sources, which account for more than 90% of the one-time energy consumption. The drying costs are high, the combustion is incomplete, and the heat loss is large; moreover, the coal-fired flue gas contains a variety of sulfides and other harmful substances. substances, causing serious air pollution. [0003] Biomass hot stoves use biomass as fuel (biomass here can be organic matter such as rice husk straw, wood, etc.); because biomass is a renewable energy source, the use of biomass as fuel realizes the effective use of waste, and The net emission of carbon dioxide after combustion is zero, and the emission of sulfide is also extremely low, so the use of biomass as the fuel of the hot blast stove not only saves en...

AI Technical Summary

Problems solved by technology

[0004] The electronic control system is the main component of the biomass hot blast stove system. The conventional electronic control system applied to the hot blast stove can ensure the normal operation of each component, but it cannot realize the automation of the whole process.

[0005] In addition, an existing intelligent gasifier solves the problems of low working efficiency of the existing gasifier valve, unstable firepower, incomplete combustion of fuel, easy gas leakage, and uneven air content of the mixed gas. The control method has the following problems:

[0006] 1. Accurate linear frequency conversion adjustment cannot be performed according to the heat demand of the drying equipment;

[0007] 2. It is impossible to feed back the state parameters of the combustion situation in the combustion chamber in real time, and it is also impossible to realize closed-loop control according to the feedback state;

[0008] 3. It cannot be applied to suspended biomass-fired hot blast stoves

Images