Compressed air has a wide range of applications in various industries, especially in the chemical industry. Compressed air is the working medium and power source for material transportation, material drying, instrument control pneumatic instruments, regulating valves. The humidity and water vapor content in the compressed air is an important parameter indicating the air quality.
National standard GB/T13277-91 <Generally used in compressed air quality grades have specific provisions. At present, the measurement and detection technology of the quality and quantity of compressed air is mature. For example, the measurement of its temperature, pressure and flow rate, the type of measuring instrument is many, easy to do; and the quantity of its quality, such as water vapor, solid Particles, total oil, etc., due to the measurement of technical means, did not attract enough attention. Among them, the analysis of the amount of water vapor), more can be seen: from the point of view: dew point meter to save money), can be done by hand Switching, measuring the dew point temperature of the combined dryer and micro-exhaust air outlet manifold, and continuously measuring continuously for a unit considered to be important in the process. The electrical wiring is as shown. It can be seen that the digital display directly displays the compression. The dew point temperature of the air, due to the low power consumption of the dew point meter, the digital display can directly supply power to the dew point meter to reduce maintenance and cost. The upper and lower limit alarms can be set on the digital display to remind the operator.
4 Factors to be considered for measuring the dew point temperature The DMT242 dew point meter is designed for extreme environments, and is pollution-proof, dust-proof and waterproof. The enclosure protection class is IP65 and can be directly installed in an industrial environment with a maximum pressure of 2 MPa. In order to improve the service life and measurement accuracy of the dew point meter, it is best to use a sampling system with a filtering device to measure in the polluted and dusty air, and then measure it after filtering.
After the new equipment, pipeline or overhaul, the measured value changes greatly due to the dynamic humidity of the air in the pipeline. The measured value is stable after the original air displacement in the pipeline.
It is inevitable that there will be leaks after the pipeline is overhauled, which also makes the measurement inaccurate. It is more obvious when it is raining, and the dew point temperature on the measured value is higher than the actual value in the normal time. Attention should be paid to plugging.
For gases of the same humidity, the dew point temperature is only affected by the pressure.
The pressure rises and the dew point temperature rises; otherwise, the dew point temperature drops. It can be seen that strictly controlling the fluctuation of the pressure of the compressed air drying system has a positive significance for accurately detecting the dew point temperature of the gas.
For the secondary instrument digital display, recorder or computer equipped with the dew point meter, the range setting must be consistent with the dew point meter range, otherwise the measurement accuracy will be affected.
In practice, the online pressure measurement should be set within the pressure compensation range specified in the manual, and the position of the pressure compensation switch on the dew point meter should be set at the measurement pressure position required by the process to improve the measurement accuracy.
The depth of insertion of the dew point measuring probe on the pipe is preferably 1/3D (D is the pipe diameter).
5 Things to be aware of when choosing a dew point meter 51 Range, accuracy and long-term stability Measurement accuracy is an important indicator of the dew point meter. According to the process measurement requirements, choose the appropriate range, accuracy and factory accuracy, the manufacturer is different, the price is very different, and the long-term stability is better.
5.2 Temperature coefficient of the dew point meter In addition to being sensitive to humidity, the humidity sensor is also sensitive to temperature and nonlinear in temperature drift. Therefore, the dew point meter itself must have compensation and calibration measures. Pay attention to the temperature range when the dew point meter is measured.
Preliminary judgment of the characteristics of the dew point meter. The new dew point meter can be humidified by the wet towel or other humidifying means before installation, and the characteristics such as range, resolution and sensitivity of the dew point state can be observed.
5.4 The calibration of the dew point meter calibration dew point meter is difficult. Finally, it should be calibrated according to the quality inspection department or the manufacturer's regular testing equipment and means such as calibration of saturated salt solution. It can also be used for comparison calibration. It is best to calibrate once every two years.
6 Conclusion The dew point meter has been accurate and stable since it was put into use in May 2004. There is basically no maintenance. In March 2006, due to the transformation of the operation room, the dew point meter was connected to the computer with RS232 serial port), which was displayed on the computer and managed centrally. The transformation of the air compressor station provides qualified compressed air for the post-order process. The detection value of the dew point meter provides the measurement technology guarantee for the compressed air quality, and also the process equipment management personnel, the air compression drying equipment maintenance, and the replacement of the adsorption desiccant. Metering values ​​are provided to ensure that the air compression drying system is always operating in an economical state. At the mouth, the synthetic filtrate is stopped for 3 minutes.
neutralize. After 3 minutes, continue to add the filtrate at 8m3/h, add 32% liquid alkali to neutralize, control pH=8 40, keep the temperature at 7075 °C, add to 775m3, stop adding synthetic filtrate, use about 05 hours, continue to add The liquid alkali was stirred at pH=1041. The mixture was stirred for 5 minutes, stirred and settled.
Settling, siphoning, discharging. After settling for 30 minutes, the supernatant was depressurized with nitrogen to neutralize the large storage tank. Each batch of material is neutralized twice, and the two tanks are batched.
3.2 Centrifugation, drying 321 process brief description The crude sodium sulfite produced by the neutralization reactor is centrifuged, collected, and then vacuum-dried in a kiln dryer to make Na2S037H2O all become anhydrous Na2S3. After drying, the product is sold by hand and centrifuged. The liquid automatically flows to the metering tank and is pressurized with nitrogen to the large filtrate tank.
322 Economic Analysis Through the above transformation scheme, pure anhydrous Na2S3 is obtained, the content is above 93%, and more fine powder is collected by centrifugal drying, which can account for more than 12% of the production of insurance powder. At present, the monthly output of insurance powder is 2,000 tons, which can produce 240 tons of sodium sulfite and a monthly benefit of 300,000 yuan. mouth
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