Energy-saving method of computer intelligent fuzzy control system for gas furnace

Abstract

The invention relates to a computer intelligent fuzzy control system energy saving method for a combustion gas furnace. The energy saving method comprises four parts: 1) an intelligent fuzzy control algorithm: realizing accurate control of the temperature through the algorithm; 2) an energy saving control strategy: according to change of the temperature in the furnace, determining the heat exchange degree between the flue gas and a workpiece, adjusting the combustion gas output quantity in real time, and realizing optimization control of the combustion gas output quantity; 3) a synperiodic multiple pulse burner uniform interval cross output method: adjusting the output sequential of the burner to reduce the instantaneous pressure difference between the furnace bottom and the furnace roof, and reducing the rising speed of flue gas so as to prolong the heat exchange time between the flue gas and the workpiece and guarantee that the heat is fully absorbed; and 4) a pressure advanced intelligent fuzzy control algorithm: enabling the hearth pressure within the allowed plus deviation scope, and increasing the average pressure of the hearth to improve the average density of the flue gas so as to accelerate the heat exchange speed between the flue gas and the workpiece and reduce the heat loss.

Description

technical field [0001] The invention belongs to the field of intelligent control in the automatic process control of industrial furnaces, in particular to computer intelligent fuzzy control technology, in particular to an energy-saving method for a gas furnace computer intelligent fuzzy control system. Background technique [0002] At present, the energy-saving technologies adopted by gas-fired furnaces are as follows: [0003] 1. Adopt air, gas heat exchanger and regenerative combustion technology to realize waste heat recovery of high temperature flue gas; [0004] 2. Use heat-insulating, light-weight, refractory and heat-preserving furnace lining materials, usually energy-saving aluminum silicate fiber cotton; [0005] 3. Adopt energy-saving burner technology, that is, choose energy-saving burner; [0006] 4. The use of infrared radiation coating technology can improve the heat transfer speed; [0007] 5. Automatically adjust the air-fuel ratio through the excess air c...

AI Technical Summary

Problems solved by technology

[0010] Schematic diagram of traditional furnace temperature control figure 1 As shown, the temperature of each point is precisely controlled through the control algorithm, but the algorithm does not consider the heat exchange time and heat exchange degree between the high-temperature flue gas in the furnace and the workpiece. If the heat exchange time is too short, the heat exchange will be insufficient, and the Part of the heat is lost from the flue before the heat exchange with the workpiece, and the heat loss is serious, which is not conducive to reducing the energy consumption of the gas furnace

[0011] The schematic diagram of traditional furnace pressure control is as follows: figure 2 As shown, in order to prevent frequent actions of the actuator, the traditional furnace pressure control algorithm usually weakens or removes the differential link and adopts the PI control algorithm. When the furnace pressure setting value is 0pa, the furnace negative pressure state is likely to occur. The furnace negative pressure state will cause cold air to be sucked into the furnace and reduce the furnace temperature, which is not conducive to energy saving. At the same time, because the furnace is in a negative pressure state, the furnace The high-temperature flue gas density is relatively small, which reduces the heat exchange rate between the high-temperature flue gas and the workpiece, thereby reducing the thermal efficiency of the gas-fired furnace

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