Continuous measuring method of humidity of high-speed medium-temperature negative-pressure air

Abstract

Disclosed is a continuous measuring method of the humidity of high-speed medium-temperature negative-pressure air. Continuous measurement of the humidity of the high-speed medium-temperature negative-pressure air is indirect. A measurement device is designed and mainly comprises a vacuum pump, a gas measuring chamber, a cooling chamber, a warmer, a hygrometer, an absolute pressure gauge, a solenoid valve, a regulating valve, and a thermal insulation device. Since an airflow channel is of negative pressure, the vacuum pump has a function of pumping to-be-measured airflow in negative-pressure environment to the gas measuring chamber. The gas measuring chamber has a function of thermal insulation and speed reduction; impact of high-speed airflow on a humidity sensor is reduced; and measurement requirements of the sensor are satisfied. The cooling chamber has a function of mixing the to-be-measured medium-temperature airflow with normal-temperature airflow of atmosphere to meet the temperature requirement of to-be-pumped gas by the vacuum pump. Data can be uploaded to center control, and remote control, real-time monitoring, and continuous measurement can be realized. The method has the advantage that the humidity of airflow in high-speed negative-pressure medium-temperature environment can be continuously accurately detected. The detection precision is high; repeated measurement is avoided; and the detection cost is reduced.

Description

technical field [0001] The invention relates to the field of environment monitoring, in particular to a continuous measurement method for high-speed, medium-temperature and negative-pressure air humidity. Background technique [0002] 1. Current state of technology [0003] In metering, humidity is defined as "the quantity of the object state", and there are many ways to express humidity, such as absolute humidity, relative humidity, dew point temperature, volume ratio, etc., relative humidity Indicates the degree to which the air is close to saturation at a certain temperature. For humidity measurement in a medium temperature environment, the dew point hygrometer is currently used more in the market. [0004] But due to the process of measuring humidity. Because there are a lot of water droplets in the air, if the airflow velocity is very high and the humidity sensor is placed in the airflow, the airflow will impact the sensor and at the same time, due to the sudden cha...

AI Technical Summary

Problems solved by technology

However, the fiber optic humidity sensor is not yet mature enough, and its requirements for measuring ambient temperature and air velocity remain to be studied

Humidity detection of flowing air in a high-speed, medium-temperature and negative-pressure environment is still a technical difficulty. It is not feasible to directly measure the air humidity in this environment with existing conventional humidity sensors.

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