Optimal operation method and system for utility boiler based on CO

Abstract

The embodiment of the invention provides an optimal operation method and a system for a utility boiler based on CO. The method comprises the steps of collecting CO concentration of an inlet of an air preheater, acquiring exhaust smoke temperature, an oxygen content of exhaust smoke, a carbon content of fly ash and fan power consumption of the currently operating boiler, determining the exhaust smoke temperature, the CO concentration, the oxygen content of the exhaust smoke, the carbon content of the fly ash and corresponding consumption difference of the fan power consumption respectively, determining operating evaluation parameters of the boiler according to the exhaust smoke temperature, the CO concentration, the oxygen content of the exhaust smoke, the carbon content of the fly ash and the corresponding consumption difference of the fan power consumption, adjusting secondary air volume of a boiler system to control the CO concentration to be in a preset scope, and adjusting coal quantity and primary air volume of the boiler system to allow the operating evaluation parameters of the boiler to be approximate to preset values. The method and the system can effectively improve operating economy and safety of the boiler, are in accordance with the current energy conservation and emission reduction policies, and have a great significance in the safe and economical operation of the utility boiler.

Description

technical field [0001] The present invention relates to a thermal power plant, in particular to a boiler system in a thermal power plant, specifically a CO-based power plant boiler optimization operation method and system. Background technique [0002] At present, the operation of power station boilers in my country is facing two major pressures: under the premise of changing coal quality, energy saving and consumption reduction; in the technical transformation of power station boilers, boiler emission reduction. On this basis, it is very necessary to make appropriate combustion optimization adjustments to the operation process of power plant boilers. [0003] Combustion optimization and adjustment of boiler operation, that is, to conduct optimization tests on the main parameters affecting the combustion conditions according to the indicators of the advantages and disadvantages of the combustion process, so that the combustion process can meet the requirements of safety, rel...

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Problems solved by technology

[0005] The above-mentioned combustion optimization control based on the amount of oxygen in the flue gas mainly has the following defects. (1) The amount of oxygen cannot directly reflect the quality of the mixture of air and pulverized coal in the furnace, and can only provide an excess air coefficient. Even if the amount of oxygen is sufficient, if Poor mixing will cause local oxygen deficiency in the furnace to present a reducing atmosphere area, which will also increase the loss of incomplete combustion; (2) The air leakage in the flue will have a great impact on the measured oxygen content, while the furnace of a general boiler 1. The flue is always operated under negative pressure, and it is difficult to avoid air leakage from the outside of the furnace into the furnace; (3) The cross-section of the flue in a large boiler unit is very large, and it is difficult to mix the flue gas evenly, resulting in serious There are only 1 or 2 oxygen measuring points at the inlet of the air preheater in the current power plant boiler unit, and the detected oxygen value is not very representative and has certain errors.

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