Monitoring system for ash fouling in power station boiler air preheater and working method of system

Abstract

The invention discloses a monitoring system for ash fouling in a power station boiler air preheater and a working method of the system. The system comprises an as-fired coal processing unit, an ash processing unit, a flue gas processing unit, a static-pressure processing unit, a smoke temperature processing unit, a pressure-drop calculating unit and an ash fouling evaluating unit; each processing unit comprises a sampling module and an analysis module; and each sampling module acquires corresponding information and transmits to the corresponding analysis module, and the corresponding analysis module performs data analysis and transmits the result to a pressure-drop calculating module, the pressure-drop calculating module calculates out an air-preheater flue gas side pressure drop value subjected to correction on the deviation of the flue gas flow and the smoke temperature from the design value and transmits to a ash fouling evaluating module, and the ash fouling evaluating module determines the ash clogging degree of the air preheater according to the flue gas side pressure calculation value and the design value. The system and the method realize real-time monitoring on ash fouling of the air preheater, and because the smoke side pressure drop value of the air preheater is subjected to correction on deviation of the flue gas flow and the smoke temperature from the design value, the accuracy for ash fouling evaluation is guaranteed.

Description

technical field [0001] The invention relates to a monitoring system for ash blocking of an air preheater of a power plant boiler and a working method thereof. Background technique [0002] On January 1, 2012, my country officially implemented the "Emission Standards for Air Pollution from Thermal Power Plants (GB13223-2011)". m 3 ; Since July 1, 2014, the NOx emission limit of existing thermal power boilers is 100mg / m 3 . In order to meet emission requirements, power generation companies need to adopt selective catalytic reduction SCR technology at the outlet of the economizer and the inlet of the air preheater. SCR technology is currently the flue gas denitrification technology commonly used in developed countries in the world. When it is put into operation, the NOx and SO in the flue gas 2 , reducing agent (urea or ammonia), etc. under the action of the catalyst, on the one hand, NOx can be reduced to harmless N 2 and H 2 O, on the other hand, also produces ammonium b...

AI Technical Summary

Problems solved by technology

It can be seen that relying on the differential pressure value displayed by the DCS to judge the degree of ash blocking of the air preheater will produce a large deviation, which cannot correctly reflect the real condition of the equipment, and then delay the best time to deal with it, resulting in aggravation of ash blocking

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