Waste incineration prediction and feedforward control method

Abstract

The invention relates to a waste incineration prediction and feedforward control method. The method comprises the following steps that the types of furnace-entering waste are obtained; the furnace-entering waste is classified based on the waste types, and then each type of classified waste is marked; the marked furnace-entering waste is mixed and then identified, and the types and the mass ratio of the furnace-entering waste are obtained; based on the types and the mass ratio of the furnace-entering waste, one or more parameters including the heat value, the water content, the fixed carbon and the ash content of the furnace-entering waste are calculated; and according to the parameters of the furnace-entering waste, one or more parameters including the air volume, the water supply flow and the fire grate running speed of an incinerator are adjusted. According to the method, the waste is subjected to fine classification and marking, then the data of the real-time furnace-entering waste are obtained, the parameters including the heat value, the water content, the fixed carbon and the ash content of the furnace-entering waste are obtained based on the data, the boiler combustion parameters are adjusted in advance, the combustion condition is prejudged, the problem of control lag is avoided, and combustion in the incinerator is optimized.

Description

technical field [0001] The invention belongs to the field of garbage incineration, and in particular relates to a garbage incineration prediction and feedforward control method. Background technique [0002] At present, the main treatment methods of municipal solid waste are incineration, landfill, and composting. Due to the continuous growth and expansion of urban scale and population, and the scarcity of land resources, the number of available landfills is continuously decreasing, and the capacity reduction of waste incineration The degree of waste reduction and harmlessness is very high. At the same time, the heat generated in the incineration process can be used to generate electricity to realize the energy conversion of waste. Many cities in China have built waste incineration power stations. [0003] However, in the actual operation of waste incineration power plants, there are problems such as unstable combustion, lagging control, and easy coking on the heating surfac...

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Problems solved by technology

[0003] However, in the actual operation of waste incineration power plants, there are problems such as unstable combustion, lagging control, and easy coking on the heating surface of the furnace. Among them, changes in the type of waste entering the furnace have a great impact on the stable operation of the boiler, mainly resulting in the following problems: ( 1) It is difficult for the control personnel to precisely control the air volume and steam-water parameters. Unlike the pulverized-coal furnace, the coal entering the furnace is relatively stable, and the types of garbage items entering the furnace are changing every moment, and the changes are large. It is difficult for the operating personnel to control stable combustion. , making the combustion insufficient or uneconomical; (2) The combustion is unstable and the control is not precise, which leads to great fluctuations in the output of the actual waste incineration. According to the statistics of the actual waste power station, the fluctuation of the main steam flow parameter can reach 30t / min; (3 ) Furnace combustion changes greatly, and the operation of subsequent pollutant control devices also needs to be continuously adjusted, but it is easy to lag behind, such as insufficient or oversprayed ammonia injection, waste of materials in desulfurization devices, etc.

The method is based on operating parameters and algorithms, and the predicted calorific value of waste is obtained through calculation, and then the predicted calorific value of waste is fed back to the controller for control; the core of the method is calculation and prediction, and finally the core data used for control The calorific value of waste is calculated, and these calculation basic parameters are constantly changing. This method does not really carry out online or offline detection of the calorific value of waste entering the furnace.

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