Sampling and measuring system and method for granularity in nuclear power plant compressed air

Abstract

The invention relates to the technical field of nuclear power plant compressed air system quality monitoring, in particular to a sampling and measuring system and method for granularity in nuclear power plant compressed air. A sampling and measuring system for granularity in compressed air of a nuclear power plant comprises: a compressed air outlet pipe, wherein one pipe opening is connected witha compressed air system; a pressure reducing valve, wherein an inlet of the pressure reducing valve is detachably connected with the other pipe opening of the compressed air outlet pipe, and the pressure reducing valve is used for reducing pressure and adjusting air flow; a sealing bottle which is inverted, wherein a first opening, a second opening and a third opening are formed in the bottom of the sealing bottle and used for gas replacement; a switching hose, wherein one pipe opening of the switching hose is connected with an outlet of the pressure reducing valve, and the other pipe openingof the switching hose penetrates through the first opening and is located in the sealing bottle; an air hose; a sample injection hose; and a granularity measuring instrument. According to the system and the method provided by the invention, a three-way principle is achieved through the cooperation of the inverted sealing bottle and the hoses, and pressurized gas is converted into normal-pressure gas, so that the granularity measuring instrument can effectively and accurately measure the granularity in compressed air.

Description

technical field [0001] The invention relates to the technical field of quality monitoring of compressed air systems in nuclear power plants, in particular to a system and method for sampling and measuring particle size in compressed air in nuclear power plants. Background technique [0002] The function of the compressed air system in nuclear power plants is to provide compressed air for the pneumatic valves and pumps of the power plant, and at the same time provide compressed air for the main control room, generator outlet circuit breaker and fire fighting equipment station. In order to monitor the air purification performance of the compressed air system and provide a basis for the regeneration and replacement of the desiccant, etc., it is necessary to regularly monitor the particle size of the compressed air system. [0003] The existing particle size measuring instrument of the nuclear power plant is the CLJ-H3016 laser dust particle counter. Air, factory compressed air...

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Problems solved by technology

[0003] The existing particle size measuring instrument of the nuclear power plant is the CLJ-H3016 laser dust particle counter. Air, factory compressed air and high-energy compressed air, the high-energy compressed air pressure can be as high as more than 20 Mpa, and the instrument / factory compressed air also has about 1 Mpa, which is much higher than the atmospheric pressure of 0.1Mpa. Obviously, this instrument cannot be directly used for nuclear power Particle size measurement in plant compressed air systems

Moreover, the diameters of the sampling pipes in the compressed air system of nuclear power plants vary, while the diameter of the sampling port of the particle size analyzer is only a few centimeters, which does not meet the basic conditions for measurement

[0004] The utility model with the application number CN201720850485.2 discloses a multifunctional compressed air sampling detection device, and the utility model with the application number CN201620581660.8 discloses a compressed air sampling collection platform. Although these sampling devices can be used for sampling compressed air, The sampling device is equipped with more control air valves and branch air pipelines, the cost is high, and the operation is too cumbersome when used for particle size sampling and measurement in the compressed air system of nuclear power plants

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