Flue gas emissions from various types of burners, industrial and commercial boilers cause serious air pollution, and monitoring of toxic and harmful gases in the flue gas is an important aspect of environmental protection work. The online continuous monitoring system for flue gas (CEMS) came into being. It often quantifies the pollutants in the flue gas based on the conditions of dry flue gas.
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Flue gas emissions from various types of burners, industrial and commercial boilers cause serious air pollution, and monitoring of toxic and harmful gases in the flue gas is an important aspect of environmental protection work. A continuous online smoke monitoring system (CEMS) has emerged, which often quantifies pollutants based on dry flue gas conditions. However, the industrial exhaust fumes are not ideal dry flue gas, and always contain a certain amount of water, so the flue gas humidity becomes a necessary factor in the monitoring of flue gas pollution sources, and the accuracy of the measurement is directly related to the total pollutant discharge. , concentration calculation and evaluation of the efficiency of the flue gas purification system
According to the relevant provisions of China's "Sampling Method for Determination of Particulate Matter and Gaseous Pollutants in Fixed Sources of Exhausted Sources" (GB/T16157-1996) and "Technical Specification for Monitoring of Fixed Source Exhaust Gases" (HJ/T397-2007), the moisture content in the exhaust gas should be It is determined by one of condensation method, gravimetric method or dry-wet ball method according to different measurement objects. The condensation method and the gravimetric method require a certain volume of exhaust gas to be taken in the flue to indirectly measure the moisture content in the exhaust gas through a condenser or a dehumidifier equipped with a desiccant. The dry-wet ball method has a function relationship between the moisture content of the unsaturated gas and the temperature difference between the dry and wet bulbs, and the moisture content of the gas is determined by measuring the dry bulb temperature and the wet bulb temperature. But these three methods are not ideal in actual sampling. Although the weight method and the condensation method have high measurement accuracy, the test is complicated, the test conditions are high, and the test time is long, which is suitable for law enforcement supervision and measurement with high measurement accuracy requirements. The dry-wet ball method is simple to test, but in the case where the flue gas temperature is too high (260 ° C), the flue gas flow rate is too high or too low, the high concentration of particulate matter, and the acid gas is discharged, it cannot be measured, so dry The wet bulb method is commonly used for atmospheric humidity measurements. In addition, the condensation method, the gravimetric method and the dry and wet bulb method are all manually measured, which cannot meet the requirements of on-line measurement of flue gas moisture dynamics.
On-line measurement of flue gas humidity mainly includes dry-wet oxygen method and resistance-resistance method. The dry-wet oxygen method measures the wet oxygen content of the flue and the dehydrated dry oxygen content measured by the oxygen sensor built in the flue gas analyzer through a zirconium oxide detector, and the flue gas humidity can be obtained according to a standard conversion method, which is easy to operate. No need for temperature stability. However, it is worth noting that the standard dry oxygen of the same measuring point cannot be provided at the scene, and there is a certain deviation in the measurement accuracy. At the same time, according to the physical properties of zirconia, if the temperature of the process sample is chilled, or the zirconium tube is easily broken when it contains a large amount of water vapor, it is not suitable to measure the high temperature flue gas containing reducing gas, which greatly limits its application in the field.
The flue gas humidity meter developed based on the RC method is the most extensive and mature technology in CEMS humidity measurement. The measurement principle is based on the change of moisture content in the flue gas exhaust and the change of resistance and capacitance value of the RC method. The function relationship directly measures the amount of water contained in the flue gas exhaust. The method has the advantages of sensitive measurement, simple method and no cross interference to other gases. The resistance volume method for measuring flue gas humidity has broad development prospects. However, it needs to pay attention to the protection of the measuring probe in the measurement of high temperature and strong corrosive flue gas. In response to the requirements of the resistance-receiving method for measuring environment, Nanjing Essen Environment independently developed anti-corrosion and anti-corrosion heating compensation technology, using platinum resistance temperature sensor to measure the temperature change of the flue gas, intelligently judging the working condition, starting the heating compensation, and ensuring the flue gas measurement process. No condensation or condensation to avoid corrosion and damage to the sensor. In addition, the humidity of the flue gas changes with the change of the flue gas temperature, and the temperature compensation can also reduce the error of the moisture measurement and further measure the accuracy. The improved online resistance-capacitance flue gas moisture measurement technology (Essen environment, patent number: ZL200610037752.0) won the “Jiangsu Province Patent New Product†(2010) of Jiangsu Economic and Information Technology Commission, which solved the high temperature flue gas. Technical problems such as high temperature, high dust and strong corrosion encountered in the humidity measurement process; using temperature compensation technology to ensure the accuracy and reliability of flue gas moisture measurement, the actual use effect can meet the following design technical indicators:
Flue gas temperature measurement range: 0~180°C
Flue gas humidity measurement range: 0~40Vol%
At present, the resistance-resistance flue gas humidity meter is widely used in different fields. The Nanjing Essen environment combines the expertise and technical reserves in humidity measurement. The flue gas humidity meter series has been developed to meet the needs of different field conditions, such as low temperature. Wet, high temperature and high humidity, garbage incineration, etc., can meet customer needs in response time, stability and measurement accuracy, and provide accurate humidity data for the conversion of pollutant content to the standard dry basis. It is a reliable flue gas humidity product.
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