Combustion optimization control system based on acoustically-measured hearth temperature field, and control method thereof

Abstract

The invention discloses a combustion optimization control system based on acoustically-measured hearth temperature field, and a control method thereof. The system comprises a data acquisition device, a data processing device, an operating mode selector module, and an execution instruction output module. A coal quality processing module, a soot blowing mode processing module, an auxiliary air distribution mode processing module, a hearth temperature field data processing module, a hearth temperature field homogenizing module, a boiler auxiliary operating mode processing module, and a boiler coal mill commissioning mode processing module are packaged in the data processing device. The execution instruction output module comprises an oxygen adjustment module and a hearth temperature adjustment module. The combustion optimization control system based on acoustically-measured hearth temperature field and the control method thereof have the advantages that interior combustion conditions can be quickly and directly reflected by the hearth temperature field, the automatic adjustment combustion system comprehensively considering all combustion influencing controllable factors is established under the condition of reliable and accurate heart temperature field measurement, boiler combustion efficiency can be improved, and the boiler is safe, stable, economical and reliable in operation.

Description

technical field [0001] The invention belongs to the field of combustion detection and control, in particular to a combustion optimization control system and control method based on acoustic wave measurement of furnace temperature field. Background technique [0002] With the implementation of air pollutant emission standards for new thermal power plants in my country, more stringent requirements have been put forward for the emission of nitrogen oxides in thermal power plants. The unit should also transform the original boiler burner into a low-nitrogen burner to reduce the emission level of nitrogen oxides. Among the low-nitrogen burners currently used in our country, considering the investment cost and the maturity of the technology, most of them adopt the air staged combustion technology. For the boiler with direct current tangential combustion, that is, the anoxic concentration separation combustion is used in the main combustion area. , Arrange part of the overfire air ...

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Problems solved by technology

[0012] Chinese patent 201110107881.3 "Optimized measurement method for flue gas temperature at furnace outlet based on flue gas energy balance" introduces a method based on the balance of furnace combustion and radiation energy, the energy balance between the flue gas side of the superheater and the working medium side, and the flue gas side of the reheater and the The energy balance of the working fluid side and the energy balance of the exhaust gas, the optimized measurement of the furnace flue gas temperature from the positive and negative directions of the flue gas side, only introduces a measurement method of the flue gas temperature at the furnace outlet, and does not involve the content of combustion optimization

The limitations of flame image processing technology and radiant energy signals used in the field have been described in detail before and will not be described again. The combustion optimization involved in Chinese patent 200910273514.3 has great limitations in optimizing only the amount of oxygen, because the combustion adjustment variables also include There are many, such as the auxiliary air distribution mode, the operation mode of the coal mill, etc., and the concentration of nitrogen oxide emissions should also be included, and the radiant energy signal is a factor that has many influences and often distorts the signal, and its variation range and frequency are relatively high , using it to control the amount of desuperheating water will easily cause the desuperheating water regulating valve to be adjusted too frequently and be damaged; Chinese patent 01133648. Including the important variable of operating oxygen (operating oxygen has an impact on the economy of the boiler and the emission of nitrogen oxides), it does not include the burner swing angle, the ratio of the staged overfire air, the condition of the furnace soot blowing and the combustion The operation of the burner, etc. Another point is that for the boiler equipped with the direct-blowing pulverizing system, the fuel volume of the burners at each corner cannot be adjusted.

[0014] Chinese patent 200710069862.X "Method and device for power plant boiler combustion optimization based on infrared radiant energy signal". The near-infrared radiant energy sensor obtains the radiation intensity information in the furnace, and obtains the radiant energy deviation value through the artificial network. Regarding combustion optimization, it is only to insert the radiant energy deviation value into the DCS system of the power plant to control the boiler fuel module and improve the boiler. Coal feeding control logic, to increase the speed of load change of the corresponding unit of the boiler, is not a real combustion optimization to a certain extent

[0015] Chinese patent 200910184471.1 "on-line optimization control system for boiler pulverized coal layered combustion and its optimization", this patent optimization method uses the flue gas sampling and analysis data from the outlet of the air preheater and the furnace as the basis, and uses the support vector machine theory as the basis for automatic

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