Thermal power boiler denitrification system flow field optimization device

Abstract

The invention relates to a thermal power boiler denitrification system flow field optimization device, aiming to solve the problem of unreasonable distribution of a thermal power boiler SCR denitrification smoke flow field. The device mainly comprises a movable porous air distributor assembly, a high-temperature-resistant online flow rate measuring instrument, catalyst layer inlet and outlet sampling guns, catalyst layer inlet and outlet test holes, a sampling tube electric switch, a sampling header, a sampling pump, a smoke analyzer, an online ammonia concentration analyzer, a computer processing system and the like. According to data such as smoke flow rate, concentration of nitrogen oxides and escape ammonia concentration, the device can be used for calculating activity index of catalysts in different area on line, and automatically computing smoke flow rate dynamic allocation schemes, and further can realize online adjustment of the smoke flow field by the movable porous air distributor assembly, so that ammonia escape is reduced to the utmost extent, residual service lives of the catalysts can be balanced, and maintenance cost of the boiler catalysts can be lowered.

Description

technical field [0001] The invention belongs to the field of SCR denitrification of large thermal power boilers, and in particular relates to a flow field optimization device of a thermal power boiler denitrification system. Background technique [0002] There are many problems in the actual operation of the SCR denitrification system of thermal power coal-fired boilers in my country: catalyst clogging and wear, air preheater corrosion and clogging, short catalyst life, and different degrees of catalyst deactivation. To a certain extent, these problems are closely related to the distribution of the flue field of the denitrification system: in the area of ​​high flue gas flow rate, the catalyst workload is large, which makes the catalyst wear and poisoning aging more serious, resulting in a decrease in catalyst activity, and ammonia escape in this area The increase will eventually lead to corrosion and ash blocking of the air preheater; on the contrary, in the area with low f...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of unreasonable distribution of flue gas flow field in SCR denitrification of large-scale thermal power boilers, especially in the case of different degrees of catalyst deactivation. ping "Catalyst Expected Remaining Lifetime"

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