Mixed gas thermal value control system and method

Abstract

The invention discloses a mixed gas heat value control system and a method. The system comprises a coking coal fuzzy controller which is used for calculating the control output quantity of a coking coal adjusting valve, carrying out heat value arrangement according to the data figured out by a heat balance unit, tracking and adjusting the feedback of a caloric value instrument and outputting the feedback to a cross decoupling unit for disposal; a high coal fuzzy controller which is used for calculating the control output quantity of a high coal adjusting valve, carrying out pressure arrangement according to the data figured out by the heat balance unit, tracking and adjusting the feedback of the mixed pressure and outputting the feedback to the cross decoupling unit for disposal; the heatbalance unit which is used for calculating the given value of the heat value and the given value of the mixed pressure and providing process thermo-technical parameters and current conditions; the cross decoupling unit which is used for carrying out the cross decoupling to the output of the high coal fuzzy controller and the coking coal fuzzy controller and controlling the high coal adjusting valve and the coking coal adjusting valve. The mixed gas heat value control system achieves the stable heat value, ensures the inlet pressure, and realizes normal running of burning machines, thus sufficiently using the residual coal gas to generate the power.

Description

technical field [0001] The invention relates to the technical field of fuel and combustion, in particular to a system and method for controlling the calorific value of mixed gas. Background technique [0002] The mixed gas is used in the coal gas-steam combined cycle power generation. The mixed gas is the mixed gas mixed with the purified blast furnace gas and coke oven gas in proportion and meets the requirements of the calorific value of the gas turbine. [0003] The calorific value control system of mixed gas is a multi-input, multi-output, strong coupling, large lag, nonlinear, and large disturbance system. Its input is high-coke gas pressure and flow, and its output is mixed gas. [0004] Normally, in normal operation (standard state), the calorific value of the mixed gas should be controlled at 5577±5% kJ / m3, and the pressure should be controlled above 4kPa. [0005] At this time, high-coke gas should meet the following conditions: [0006] Calorific val...

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Problems solved by technology

[0008] However, in the prior art, due to the parabolic relationship between the opening of the butterfly valve and the gas pressure and flow, if one of the input blast furnace gas or coke oven gas changes, it will affect both the pressure of the mixed gas and its calorific value , and the operating parameters are greatly affected by the change of working conditions, it is difficult to control its accuracy

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