Tritium-containing exhaust gas discharge monitoring automatic sampling system

Abstract

The invention provides a tritium-containing exhaust gas discharge monitoring automatic sampling system and belongs to the technical fields of radiation protection and environmental protection. The air inlet tube joint in the sampling system is connected with a flow control valve, solenoid valves, dust filters, a mass flow meter and a pressure meter through a gas tube and then is connected with the gas inlets of pumps, and the gas outlets of the pumps are connected with the joints of an exhaust tube through exhaust tubes; the gas inlet and the gas outlet of a total tritium sampler are connected with a gas collection tube and the exhaust tube through flexible tubes respectively; and the signal input end of an automatic control unit is in external connection with a chimney flow monitoring PLC controller, and the signal output end of the automatic control unit is connected with the total tritium sampler, the flow control valve, the solenoid valves, the mass flow meter, the pressure meter and pumps respectively. The sampling system which allows the sampling precision to be less than 1min has the advantages of intelligent regulation and control, strong practicality, improvement of the fragmentary discharge of a tritium effluent, improvement of the representativeness of a tritium monitoring sample when the concentration difference is large, mitigation of the labor intensity of an effluent monitoring sampling personnel, and improvement of the working efficiency.

Description

technical field [0001] The invention belongs to the technical field of radiation protection and environmental protection, and in particular relates to an automatic sampling system for monitoring the discharge of tritium-containing exhaust gas, in particular to an automatic sampling system for monitoring the source of tritium-containing exhaust gas when it is discharged from a chimney. It is suitable for tritium gas and tritiated water sampling for the monitoring of tritium-containing waste gas to the environment emission source items in tritium operating glove boxes, secondary containment systems, tritium purification treatment systems, nuclear power plant workshops and other places. Background technique [0002] At present, there are two main ways to monitor tritium emission sources in airborne effluents, one is online measurement through fixed tritium monitors, and the other is offline analysis and measurement in laboratories after bubbling collection or condensation collec...

AI Technical Summary

Problems solved by technology

According to the current effluent monitoring mode, whether it is regular sampling or continuous sampling, it is not feasible to monitor the emission of tritium-containing exhaust gas. It cannot reflect the working conditions of tritium-containing exhaust gas emissions in tritium-related operating sites, and the monitoring results cannot truly and objectively reflect the number of workers. Tritium-containing exhaust emission source term

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