Iodine vapor distributing device with on-line iodine function

Abstract

The invention provides an iodine vapor distributing device with an on-line iodine feeding function. The iodine vapor distributing device comprises an iodine vapor generating system, a carrier gas preheating system, an online iodine feeding system, pipelines and valves, wherein the pipelines and the valves are used for connecting all the systems; the carrier gas preheating system comprises an air compressor, a gas storage cylinder, a spiral pipe and a first water bath; the iodine vapor generating system comprises an iodine pool, an upper gas distributing plate, a carrier gas pipe, a lower gas distributing plate, a carrier gas diffusion nozzle and a second water bath; and the online iodine feeding system comprises a feeding hopper, a spherical valve and a feeding pipe. The iodine vapor distributing device provided by the invention is economic and reliable, can meet requirements on continuous operation under different working conditions, can be applied to performance tests of a safety housing filtering and discharging system, and is also suitable for other fields such as chemical industry needing continuous iodine feeding for a long time.

Description

technical field [0001] The invention relates to a device for generating and distributing iodine vapor. Background technique [0002] The containment filter and discharge system is a system set up to ensure the integrity of the containment. When a serious accident of core meltdown occurs, the containment filter and discharge system will release the gas in the containment by active pressure relief. After washing and filtering, it is discharged into the environment to achieve the purpose of preventing the overpressure of the containment vessel, reducing the release of radioactive substances into the environment as much as possible, and reducing the radiation dose of the public from accidents. As one of the fission products, 131I is easily leaked from defective fuel elements and is highly radioactive. The amount released into the environment has been used as a standard to measure the severity of accidents. In order to reduce the consequences of serious accidents , the radioacti...

AI Technical Summary

Problems solved by technology

The current conventional method is to mix high-purity nitrogen with a certain amount of iodine to prepare iodine vapor with the required concentration, then store it in a high-pressure steel cylinder and transport it to the gas environment. This method can provide continuous and relatively stable iodine vapor, but However, this method has major disadvantages: firstly, the process is complicated, and the cost of preparing and storing iodine vapor is too high; secondly, due to the limited filling gas of the steel cylinder, multiple steel cylinders need to be prepared for long-term continuous use, and the steel cylinders are replaced frequently. Not suitable for long-term continuous use

In the patent documents whose patent application numbers are 9827605.7, 98237990.0 and 02209679.5, a kind of iodine vapor generating device using resistance wire heating is disclosed. Carry the iodine vapor that produces with bubbling method, in order to use; In the patent document that the patent application number is 200710158294.0 also discloses a kind of rapid continuous iodine supply device, describes described iodine supply device with the form of system block diagram, but does not Do any description of the structure of the iodine generator, and the above-mentioned several iodine supply devices are designed for the oxygen-iodine laser. The long-term (24 hours) continuous work requirement required by the experimental circuit of the filtration and emission system; in addition, cold helium is used as the carrier gas, and the helium coil is directly above the heating resistance wire. If the heating is insufficient, the cold helium The gas will disturb the temperature in the generator, break the dynamic equilibrium process established in the iodine generator, thereby affecting the performance of the iodine generator, and causing the instability of the iodine outlet concentration; finally, the iodine steam generator adopts flange connection, Large volume and weight, inconvenient to disassemble

In the patent document with the patent application number 201020132053.6, a device for disposing iodine vapor is disclosed. The iodine vapor generating device adopts the method of heating with a heating belt, and uses nitrogen as a carrier gas to carry the generated iodine vapor to a predetermined pressure. system, but the device does not describe the mixing process of carrier gas and iodine vapor, nor does it mention the method of online iodine addition, and it is impossible to determine the working status of the distribution device during continuous operation

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