Real-time optimizing control system and method for ammonia spraying partitions of SCR device

Abstract

The invention relates to a real-time optimizing control system and method for ammonia spraying partitions of an SCR device. The SCR device is longitudinally divided according to mounted ammonia spraying grid partitions, the corresponding inlet flue gas partition, catalyst partition and outlet flue gas partition are classified into the corresponding partitions, an oxynitride probe is mounted in the center of the corresponding partition of each of the flue gas inlet and the flue gas outlet, and all the oxynitride probes are connected with a field transmitting box through a signal line; a sampling probe is mounted in the center of every two corresponding partitions of the flue gas outlet, and all the sampling probes are connected with a semiconductor laser gas analyzer through a sampling tube; the field transmitting box and the semiconductor laser gas analyzer are connected with an industrial control computer, and the industrial control computer is used for controlling the remote electronic control valves. The data of the concentration of NO<X> of various partitions of the outlet / inlet and concentration of escaping NH3 in various partitions of the outlet is transmitted to the industrial control computer, and the data is analyzed and processed through the industrial control computer, so that the remote electric valves are accurately controlled in real time to regulate the amount of sprayed ammonia of the corresponding partitions.

Description

technical field [0001] The invention relates to a real-time optimization control system and method for ammonia spraying zones of a denitrification device (SCR) based on online analysis of atmosphere concentration field distribution. Background technique [0002] The flue gas selective catalytic reduction denitrification device (SCR) is currently an important environmental protection facility in major thermal power plants. X Remove. In the actual operation process, the control of the amount of ammonia injection will directly affect the efficiency of denitrification and affect the NO X As well as the up-to-standard discharge of fugitive ammonia, it will affect the service life of the catalyst, thereby affecting the overall denitrification operating cost. [0003] At present, the control of SCR ammonia injection mainly adopts the mode of total amount control and adjustment. X Concentration, flue gas flow, ammonia-nitrogen molar ratio, and catalyst conversion efficiency are u...

AI Technical Summary

Problems solved by technology

However, due to the lack of continuous online monitoring means, it is impossible to truly and comprehensively understand the internal conditions of the SCR. Manual adjustment is more based on experience and feeling, resulting in a low level of overall operation and management of the SCR device, resulting in increased follow-up equipment maintenance and difficult operating costs. control

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