Thermal power plant boiler combustion efficiency intelligent analysis system and method

Abstract

The invention discloses a thermal power plant boiler combustion efficiency intelligent analysis system and method. The thermal power plant boiler combustion efficiency intelligent analysis system andmethod adopt a mode of combining open-loop control and closed-loop control. The thermal power plant boiler combustion efficiency intelligent analysis system comprises a boiler real-time measurement and calculation module, a target control module, a strategy control module and a boundary judgment module. The thermal power plant boiler combustion efficiency intelligent analysis method is based on anO2 / CO coupling relationship, boiler heat efficiency is taken as a main control target, and NOx and CO concentration is balanced; through a combustion optimization test, the relevance between the O2 / CO concentration and the carbon content and NOx concentration of ash is determined, and powder making system operation parameters and boiler O2 / CO optimal cooperative operation parameters under different loads are determined; and according to experimental research, an O2 / CO optimal cooperative operation scheme is formulated, related control logic is modified on a DCS, a set of intelligent combustion efficiency analysis system with independent intellectual property rights is formed, the current optimal operation scheme is intelligently prompted, an operator is guided to carry out combustion adjustment and operate according to the scheme, and the boiler efficiency is improved by more than 1%.

Description

technical field [0001] The invention relates to the technical field of optimized operation of a coal-fired boiler in a thermal power plant, in particular to an intelligent analysis system and method for boiler combustion efficiency in a thermal power plant. Background technique [0002] The combustion of pulverized coal in a power plant boiler is a complex multi-flow physical and chemical change process. The boiler combustion system is a nonlinear, multi-variable, and strongly coupled complex system. The adjustment of a single variable affects other parameters, which is a typical multi-variable The optimization system of the goal is to pursue the optimization of the comprehensive indicators of boiler operation safety, economy and environmental protection under the premise of ensuring that the pollutant discharge reaches the standard, so as to minimize the comprehensive cost. [0003] Boiler efficiency is an important economic index, which is mainly affected by exhaust gas he...

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Problems solved by technology

[0006] To sum up, boiler combustion adjustment and control need to comprehensively consider many indicators such as boiler thermal efficiency, NOx, near-wall area and economizer outlet CO concentration, and the boiler combustion process involves multi-boundary and multi-variable coupling control. The actual operation control process It is difficult to achieve accurate control and adjustment of multiple coupling variables. If all variables are used as the optimization target, the optimization control system will be very complicated and difficult to achieve the desired effect

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