Wet type sample gas analyzing system applicable to monitoring of combustion conditions of coal-fired kilns

Abstract

A wet type sample gas analyzing system applicable to monitoring of combustion conditions of coal-fired kilns comprises a sampling probe, a sample preprocessing cabinet, an analyzing cabinet and the like. A jet pump for gas pumping, a gas-water separator, a dehumidifier, a filter, a buffer tank and a water drainage tank are mounted in the sample preprocessing cabinet, a secondary filter, an electronic cooler, a secondary buffer tank, a sample gas switching valve, a standard gas cylinder, a paper filter, a flow meter and a gas analyzer are mounted in the analyzing cabinet, and the sample preprocessing cabinet and the analyzing cabinet are mounted in a field analysis meter cabin. The system is capable of effectively removing dust in the sample gas with clean water and continuously acquiring waste gas samples, analysis result curves are continuous without breakpoint. Umbrella-shaped dust removal water mist sprayed by the probe can completely wash sample gas entering the system to remove various harmful and corrosive substances irrelevant to component analysis of O2, NO and CO in waste gas generated by fuel coal, and the wet type sample gas analyzing system used with the field analysis meter cabin is convenient to use, long in service life, simple in structure, low in maintenance and low in cost.

Description

technical field [0001] The invention relates to a sampling gas analysis device for a cement kiln, in particular to a wet sampling gas analysis system suitable for monitoring the combustion status of a coal-fired kiln. Background technique [0002] The analysis of the composition of the waste gas emitted by the kiln combustion is one of the main bases for the evaluation of kiln efficiency, energy consumption, and pollution emissions. Kiln exhaust gas detection is faced with a harsh environment of high temperature and high dust. The exhaust gas of cement kilns that use coal as fuel not only has high temperature and a lot of dust, but also has complex exhaust gas components. Accurate, reliable, online continuous detection and analysis has always been a research topic in the instrumentation industry. ABB and Siemens in Germany abroad, Sichuan Instruments, Nanjing Analytical Instruments, Beijing Analytical Instruments, Beijing Sickmahak, Xuedilong and other companies with domes...

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Problems solved by technology

[0004] 1. The probe equipment is complex and expensive: because the probe used in this technology needs to constantly blow the probe and filter element with compressed air to remove dust, and the probe must be pulled out and cleaned once within 1 to 2 hours, which requires a huge probe The traveling mechanism, the control panel cabinet, and the site shall have a dedicated gas analysis device installation platform of about 5 square meters

[0005] 2. Sample gas collection is discontinuous and inefficient: Sichuan instrument products with domestically imported technology: the general backflush interval is less than 7 to 10 minutes, and the probe is pulled out for cleaning every 2 hours; the standard of ABB company in Germany is that the backflush cycle starts from 3 minutes , 15 minutes until 1.5 hours, divided into 7 gears, the probe pull-out time is 30 minutes, 2 hours and 30 minutes until 15 hours, which are also the corresponding 7 gears; but only the lowest gear can be used in the kiln tail smoke chamber in the cement industry up

If no acid mist filter or hydrogen peroxide scrubbing is used, the sample gas will corrode the pipelines, components, and analysis instruments of the system, shortening the service life of this directly transplanted gas analysis device

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