Influence of Denitration Equipment on Power Station Boiler
2020-11-30
With the development of economy and society, air pollution is a serious ecological and environmental problem at present. NOx emissions from utility boilers reduce air quality and may form acid rain. InDenitration equipmentDuring installation and operation, not only the efficiency of flue gas denitration, but also the adverse effects of the device on the economy and safety of the boiler should be paid attention. Under the current situation, in the process of denitrification in my country's thermal power plants, it is necessary to continuously accumulate experience to improve the safety and operating efficiency of the device.
Denitration equipmentThe denitration catalyst has a specific temperature requirement for the flue gas entering the reactor during the reaction. The reaction temperature not only determines the reaction rate of the reactants, but also determines the reaction activity of the catalyst, and the applicable temperature is between 300-400°C. If the flue gas temperature is higher than 400°C, catalyst sintering problems may occur, thereby losing activity. If the flue gas temperature is lower than 300 ℃, it is easy to increase the content of ammonium bisulfate, which will block and corrode the boiler in severe cases.
InDenitration equipmentUnder different load conditions, the required fuel quantity and furnace temperature are different, so the flue gas temperature will fluctuate accordingly. In order to meet the requirements of NOx removal in the flue gas during the variable load operation of the boiler, it is necessary to modify the heating surface and flue at the tail of the boiler to ensure that the thermal efficiency of the boiler is not affected. Reduce the flue gas temperature, can be consistent with the normal system. Operational requirements. The specific plan for reforming the heating surface at the tail of the denitration equipment can be divided into two types, one is to transform the economizer, and the other is to install the flue gas bypass.
1. Retrofit the economizer
AccordingDenitration equipmentDuring the operation, the temperature of the tail flue changes, the heat of the tail flue is calculated, the heat absorption is reasonably determined, and the installation position and the number of tube bundles of the economizer are rearranged. The revamped economizer can handle the heat exchange pipe without changing the pipe specifications and materials. It is convenient to determine the heat absorption of the economizer according to the specific conditions of load change and the purpose of controlling the flue gas temperature in this way.
2. Install flue gas bypass
The baffle door and the bypass flue are installed between the reactor inlet and the upper part of the economizer. After the modification, when the flue gas temperature is too low to meet the operating requirements of the catalyst and affect the normal progress of the denitration reaction, the bypass flue gas can be adjusted. The baffle of the original flue gas mixes high-temperature flue gas.
Gas into low temperature flue gas, adjustDenitration equipmentThe ratio of flue gas at different temperatures at the inlet of the reactor can effectively adjust the temperature of the incoming flue gas. This modification is usually applied to the initial stage of boiler start-up and during low-load operation, because it will increase the exhaust temperature of the boiler and reduce the thermal efficiency of the boiler, so when the flue gas temperature at the outlet of the economizer reaches the standard, the flue gas bypass should be withdrawn in time.
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