Computer Intelligent Fuzzy Control Energy-saving Method for Gas Furnace Furnace Pressure

Abstract

The invention relates to a gas furnace kiln furnace hearth pressure computer intelligent fuzzy control energy saving method, which is constituted by a temperature intelligent fuzzy control algorithm and a pressure advanced intelligent fuzzy control algorithm. The temperature intelligent fuzzy control algorithm is used for the accurate control of the temperature by the fuzzy control algorithm based on the control rule self-regulation and the intelligent integration. The pressure advanced intelligent fuzzy control algorithm is used for the control of the furnace hearth pressure by adopting the temperature control output quantity and the pressure deviation as the input quantity. By adopting the algorithm, the furnace hearth pressure p can be kept in the allowed positive deviation range constantly, and the average pressure of the furnace hearth can be improved, and then the average density of the high temperature smoke in the furnace can be increased, and in addition, the convective heat transfer speed and the radiative transfer speed between the smoke and the work piece can be accelerated, and therefore the energy consumption of the gas furnace hearth can be reduced. The temperature control output quantity can be used for the furnace hearth pressure control, and the adjustment of the flue gate opening degree can be carried out before the change of the furnace hearth pressure, and therefore the improvement of the furnace hearth pressure control stability can be facilitated.

Description

technical field [0001] The invention belongs to the field of intelligent control in the automatic process control of industrial furnaces and kilns, and specifically belongs to computer intelligent fuzzy control technology. In particular, it relates to an energy-saving method for computer intelligent fuzzy control of furnace chamber pressure of a gas furnace. 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. Automa...

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Problems solved by technology

[0010] The schematic diagram of traditional furnace pressure control is as follows: figure 1 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. Furnace pressure set value is 0p a When the furnace is under negative pressure, it is easy to have a negative pressure state in the furnace, which will cause cold air to be sucked into the furnace to reduce the furnace temperature and waste energy. At the same time, because the furnace is in a state of negative pressure, the density of high-temperature flue gas in the furnace is relatively small , reducing the heat exchange speed between the high-temperature flue gas and the workpiece, and a part of the heat is taken away from the flue before the heat exchange with the workpiece, which reduces the thermal efficiency of the gas furnace

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