Control method and gas pretreatment system for integrated gas analysis

Abstract

The invention relates to a control method and gas pretreatment system for integrated gas analysis. The gas pretreatment system for integrated gas analysis compromises two sampling device which includes a sampling shell provided with a gas inlet and a filter element inside. The inner cavity of the filter element is communicated with the inner cavity of the sampling shell through the filter holes arranged on the filter element, and also communicated with a gas outlet. A gas distributor is fixed on the sampling shell. An air outlet of the gas distributor is provided with a nozzle. An air jet port of the nozzle is towards the filter element. The air inlets of the gas distributors of a first sampling device and a second sampling device are respectively connected with the air supply through a first sweeping pipeline and a second sweeping pipeline. The gas outlets of the first sampling device are respectively connected with the imports of an exhaust port and a condenser through a first sampling line. The gas outlets of the second sampling device are respectively connected with the imports of the exhaust port and the condenser through a second sampling line. The air outlet of the condenser is connected with an analyzer. The control method and gas pretreatment system for integrated gas analysis has the advantages of simplifying the system and achieving the seamless handover between sweeping and sampling.

Description

technical field [0001] The invention relates to the field of gas analysis, in particular to a gas pretreatment system for comprehensive gas analysis and a control method thereof. Background technique [0002] In blast furnace production, it is very important to analyze CO, C02, H2, O2 in the comprehensive gas at the top of the furnace to judge the blast furnace condition and equipment working condition, and to complete the efficient operation of the blast furnace. The difficulty of the furnace top integrated gas continuous analysis system lies in the sampling and purification treatment of the sample gas. At present, the main pretreatment devices used in China are as follows: [0003] 1. Use the air pump to pump the gas into the dust filter, go through multi-stage dust removal, remove most of the dust, and then remove most of the water through the gas-water separator, and finally enter the analytical instrument through the fine filter. In addition, the sample gas pretreatme...

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Problems solved by technology

The system uses a multi-stage purification device, the system is very complex, the system maintenance workload is large, the professional knowledge of the maintenance personnel is high, and the key components of the system (such as electric and pneumatic valves, filter elements) have short lifespan and other shortcomings.

[0005] 3. "A Blast Furnace Comprehensive Gas Continuous Analysis System" invented by Anhui University of Technology. Its pretreatment sampling device uses the moisture attached to the gas to condense it and automatically cleans the dust accumulated in the sampling device. Although it has a certain effect, its In the case of insufficient condensed water, it is impossible to clean the accumulated ash in time. When the amount of ash accumulated becomes larger and larger, it will form hardening and block the air inlet of the sampling device, and the sampling device will not be able to sample normally, which will affect the work of the system.

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