An automatic control method for biomass water-cooled vibrating grate boiler load
A technology of vibrating grate and boiler load, applied in the direction of combustion control, combustion method, control system, etc., can solve the problem of lack of automatic adjustment and control of biomass water-cooled vibrating grate boiler load, reduce labor intensity, improve automation level, The effect of precise and timely adjustment
Active Publication Date: 2020-09-11
中电行唐生物质能热电有限公司
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Problems solved by technology
[0005] The present invention aims at the above problems, and the purpose is to provide a method for regulating the load of a biomass water-cooled vibrating grate boiler, which can solve the problem of lack of automatic adjustment and control of the load of a biomass water-cooled vibrating grate boiler in the prior art
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Embodiment 1
[0047] as attached Figure 1-Figure 3 As shown, a dialog box is set on the DCS screen for operators to manually set, including main steam flow, main steam pressure, main steam temperature, fuel moisture and ash content. In the configuration logic, the upper limit and lower limit functions are used to judge the validity of the numerical value input by the operator. Operators calculate it based on the steam consumption rate and active power of the turbo-generator set, and the moisture and ash values of the fuel fed into the furnace are obtained through fuel industry analysis.
[0048] According to the boiler design specification or operation adjustment test, the optimal oxygen value under different loads (main steam flow) can be obtained. Therefore, the oxygen value under different loads is calculated by the broken line function f(x0).
[0049] The set values of main steam flow, main steam pressure and main steam temperature are calculated through the water vapor enthalpy ...
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The invention relates to an automatic control strategy and method for the load of a biomass water-cooled vibrating grate boiler. The difference between the set value and actual value of a main steam enthalpy value is used as a load instruction signal of a feeding controller to adjust and control the rotation speed of a variable-frequency feeding device; according to the moisture numerical value and the ash content numerical value of fed fuel, on the basis of designed fuel elementary compositions, the actual elementary compositions of the actually fed fuel meeting demands is obtained through fitting, the difference between the air supply volume of a set load and the air supply volume of the actual load is worked out and used as the main instruction signal for adjusting the rotation speed ofa variable-frequency air feeder. By the adoption of the automatic control strategy and method for the load of the biomass water-cooled vibrating grate boiler, the features of biomass fuel and a water-cooled vibrating grate boiler device are taken into full consideration, the main steam enthalpy value is used as a load instruction signal to achieve accurate and timely adjustment, the fuel diversity problem is solved through the fitting algorithm of the biomass fuel composition elements, the problem that certain hysteresis exists between burning and feeding in the water-cooled vibrating grate boiler is solved through 'interval air-material ratio', and the automatic control strategy and method are the scientific and effective control strategy and method.
Description
technical field [0001] The invention relates to the technical field of biomass boiler application, and more particularly, relates to an automatic control method for the load of a biomass water-cooled vibrating grate boiler. Background technique [0002] Biomass energy is second only to coal, petroleum gas and natural gas and ranks fourth in the world's total energy consumption, and occupies a very important position in the energy system. The development of agricultural and forestry biomass thermal power industry in China can not only solve the problem of air pollution caused by open-air burning of straw in rural areas, but also solve the needs of county residents for clean heating and power supply, and at the same time solve the employment problem of local farmers and achieve targeted poverty alleviation, which is beneficial to the country The sunrise industry of the people. [0003] Since China's first biomass generator set was put into operation in 2006, agricultural and ...
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IPC IPC(8): F22B35/00F23N1/02
CPCF22B35/00F23N1/02
Inventor 宋鸿伟袁洪波王文华关键王雁斌刘浩
Owner 中电行唐生物质能热电有限公司