Optimized control method of combustion in multiple fire nozzle hearth of boiler

Abstract

The present invention belongs to the combustion controlling technology of boiler hearth, especially of multiple fire nozzle hearth, and is suitable for the combustion monitoring of combustion in a four corner-rounded boiler. The present invention relates optimized efficient low nitrogen oxide exhaust control by arranging several flame image detectors to obtain the 3-D temperature distribution in hearth and through fitting the expression between radiation energy E and power generating load NE of the poer set, measuring the flame center height and the change rules of flame section temperature center with fuel amount and blast distribution proportion in different layers and different corners, and giving control command of fuel amount and blast distributino proportion in different layers and different corners according to boiler load, fuel amount and blast amount.

Description

technical field [0001] The invention belongs to a combustion control method of a boiler furnace, in particular to an optimal control of combustion in a multi-burner furnace. Background technique [0002] In order to reduce NO in thermal power plants X Emission levels, staged combustion, flue gas recirculation, catalytic combustion, selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR), and non-selective catalytic reduction (NSCR), etc. Huge investment is required for boiler equipment transformation or flue gas treatment device construction. For single burner combustion system, directly detect NO in flue gas X Optimal control of fuel volume and air volume by parameters such as emissions can achieve good results. But for the boiler combustion system with multiple burners, literature (K.Pitscheider and E.Welfonder, Modelbasedonline minimization of NO X -emission in power plants with pulverized coalcombustion, Proceedings of the 13th IFAC World Congre...

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Problems solved by technology

The "Detection Method of Furnace Combustion Temperature Field" proposed by the applicant has been authorized by the State Intellectual Property Office (Patent No. ZL95114823.0). Multiple two-dimensional radiation images of combustion are extracted at different heights, and the three-dimensional combustion temperature distribution is obtained from the corresponding relationship between the radiation energy received from the furnace corresponding to each point on the image and the radiation energy of relevant points in the three-dimensional space in the furnace. At present, it has not been seen that the visualization results of the furnace combustion temperature field are applied to the multi-burner combustion system for low NO X Optimal control of emissions

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