On-line monitoring of generator hydrogen humidity Nie Xiqing Liaoning Power Plant. Liaoning Fushun 3007 advanced online moisture meter solves the shortcomings of the original monitoring method. The on-line monitoring of generator hydrogen humidity is realized. It can be used as reference for other power plants in the improvement of generator hydrogen humidity monitoring. Two sets of Liao Power Plant 2, the generator is scared 82002 type, using water hydrogen hydrogen cooling. In the past, monitoring of hydrogen humidity in generators was a manual sampling of dry and wet bulbs to control the relative humidity of hydrogen. However, the hydrogen humidity index has been unstable for many years, resulting in untimely or frequent input of hydrogen drying equipment. Excessive hydrogen humidity of the generator will increase the stress corrosion of the equipment and become a potential hidden danger in safety production. Therefore, the timely and accurate monitoring of the hydrogen humidity index of the generator is an important part of the operation of the large-scale unit. Therefore, after several years of research, the chemical technicians of the chemical industry in Liao, China have introduced the combined detection of dew point temperature and absolute humidity. The new online hydrogen humidity monitoring technology uses the Finnish production 12640 online temperature and humidity meter instead of the old monitoring method. After being put into production for more than two years, the analysis results and measurement accuracy can meet the various needs of production, and solve the above problem. 1 Hydrogen humidity is harmful to the generator. China's large-scale hydrogen-cooled generator has repeatedly exceeded the hydrogen humidity. A major accident such as insulation breakdown at the end of the stator coil or cracking of the rotor retaining ring occurs. Moreover, it will also cause the generator to have a large ventilation loss. The annual consumption of electric energy is up to several hundred thousand. The most sensitive part of the hydrogen hydrogen humidity is the rotor retaining ring, followed by the stator end insulation = when the retaining ring is used. When the materials are 185 and 18 rivers, if the relative humidity is 60, the yield and corrosion rate of the corrosion cracks will increase. The main disadvantages of the 2 original hydrogen humidity monitoring methods are that the domestic hydrogen humidity monitoring of generators is usually Manual sampling, dry and wet ball method for each analysis, the main control indicator is the relative humidity value of hydrogen. The main problem is that the indicators monitored by the method are relatively simple, only one-sided reflection of the operating state of the hydrogen circulation system, and lack of effective monitoring measures for the system due to oil and other impurities. In the hydrogen circulation system, the hydrogen temperature is not balanced everywhere, and the relative humidity of hydrogen is not balanced. Therefore, since b monitors the humidity value of hydrogen in the generator, the calculation uses atmospheric pressure, which is actual. There is a fixed difference between the hydrogen pressure values ​​in the machine. When the hydrogen humidity measured by the original method is measured and converted into the pressure inside the machine, the error can reach 150200, which can not reflect the real value of the hydrogen humidity of the hair dryer. The method of manual sampling and manual analysis is affected by the environment and other factors. The degree and accuracy are lower, and the actual 1 error of the system is better.

a Manual sampling is also safe. At the time of sampling. Usually, the sampling door is opened to the exhaust gas 45, and the rear can be sampled. The purpose is to flush the dead corners in the Hanqi road, and to maintain a stable flow rate and pressure. However, on-site fire protection requirements are more stringent, and the daily hydrogen displacement is a potential accident. Therefore, changing the monitoring method is also a description of the above-mentioned tips for ensuring the safe operation of thermal power plants. 1 was artificially sampled. The test method has a low degree of environmental temperature, the normal condition of the system, and so on. Therefore, the off-line analysis method has lagged far behind. In order to monitor and evaluate the hydrogen humidity of the 200 Hejia unit generator, it is necessary to carry out on-line monitoring of the generator hydrogen to reflect the true state of the generator hydrogen and prevent the serious damage caused by the hydrogen humidity exceeding the standard.

3 Using the new method of joint monitoring of dew point temperature and absolute humidity, it is concluded that the hydrogen humidity of the hydrogen-cooled generator is mainly related to the dew point in the machine, and the dew point corresponds to the saturated absolute humidity of the water vapor under the partial pressure of the mixed gas. The relationship, and when the water vapor in the wet hydrogen is in an overheated state, the hydrogen in the generator is ninjVlStf, i; iJ, jtfeJ1! The iiHaitTOSHfl value corresponds to the relationship. That is to say, corresponding to a dew point value, there may be a number of absolute humidity that is not 1 digit. According to the investigation, most of the foreign power plants often use the dew point temperature method as the control index of hydrogen.

After welcoming the analysis and research, we found that the monitoring of the dew point and the absolute humidity is more accurate and stable, which makes the supervision of hydrogen humidity more comprehensive and timely, and the timely investment of the cooling dryer is better. The guiding role.

According to the actual characteristics of the generator set, Liaoning Power Plant selected the following parameters: standard hydrogen production station outlet hydrogen humidity as dew point 25 absolute humidity 2.5 generator, gas humidity for dew 0 absolute humidity 101 seal 汕 water content test 4 select advanced hydrogen The humidity measuring instrument has introduced the 2640 online temperature and humidity meter produced by the Finnish Vaisala company with international advanced level through the investigation of such instruments at home and abroad. At the same time, the two indicators of dew point temperature and absolute condition are used instead of the original relative humidity. On-line monitoring of hydrogen gas condition 4.2640 Model temperature and humidity sensor installation and use This sensor is a pipe-mounted product, and its probe is installed in the manufactured bypass pipe section without destroying the original hydrogen sampling system. In normal operation, turn off the hydrogen DC with the display and keyboard to display the measured data. At the same time, it calls its user interface. Use the keyboard to set the sensor's working status sensor to meet the 5232 serial bus or use the 15485422 serial bus or digital loop module, ± computer or terminal.

b When the unit is sliding and standby, the bypass measuring system can be closed and the DC pipe section can be opened to facilitate other work, such as normal replacement and flushing of 32, which greatly facilitates the use and maintenance of the instrument.

The application of 4.212640 type on-line temperature and humidity meter 1 2641 difficult transmitter with microprocessor, the temperature and humidity values ​​measured by the sensor can be used to calculate other parameters. With two analog output channels, the dew point temperature and absolute humidity parameters can be used as output signals to monitor the generator hydrogen humidity online.

1 Liaoning Power Plant conducted a comparative experiment during the long running time after the instrument was put into stable equipment. The main gas index in the generator is the dew point temperature, which is maintained at about 25; the absolute humidity is maintained at 24 m3. about. This shows that the instrument has good on-line monitoring performance, so that the hydrogen humidity value in the generator can be maintained directly for a long period of time, which can effectively prevent the accident of hydrogen accidents from exceeding the standard on the generator hall.

4.3 Grab 12641甩 online temperature and humidity monitoring characteristics 3 The monitor is easy to install, easy to monitor, basically no maintenance test during normal operation; transmitter probe has strong resistance to oil and water pollution, good measurement accuracy and wide application The work water seeps into the slope along the slope of the ground. For the soil slope part of the excavation slope, the reinforced concrete frame is used to protect the slope, and the frame square is filled with dry stone.

3.4 Application 1 and other measures Reasonable excavation of side sills shall be carried out from top to bottom. The construction method shall adopt trenching excavation to achieve layer-by-layer excavation and excavation and side support; strictly control coal breakage and adopt deep hole pre-cracking Baochengcheng core blasting hurricane drilling shallow hole small gun blasting, etc., to minimize the vibration effect of blasting on the slope; earnestly grasp the engineering monitoring work during the construction period, buried the inclined hole multi-point displacement gauge anchor cable dynamometer soil displacement meter Monitoring facilities such as pressure measuring tubes, timely feedback of monitoring results, and guiding the implementation of the project.

5 Conclusion 3 The dew point temperature and absolute humidity combined with on-line hydrogen humidity monitoring method to replace the original hydrogen humidity method, to solve the irregularities caused by the hydrogen cold dryer and the error caused by human sampling test; b using 2640 type temperature Humidity monitor, can be connected straight up on page 39. It is necessary to use desuperheating water to reduce the temperature of superheated steam. It is necessary to turn on the stage desuperheating beam to protect the rear screen superheater and reduce the flame center operation by reasonable air distribution. Over-temperature, 4 conclusions The rear slope of the expansion project of Yulin Hydropower Station is the high slope under the complex geological conditions of the raft. Due to the excavation of the plant and foundation, the slope will be excavated or reduced after the weight of the slope. The slope is broken along the sliding of each weak structural belt. In the reinforcement treatment measures, measures such as load shedding plus anti-sliding, anchor bolts and drainage are adopted, which is technically feasible and economical. The current slope treatment has been completed, and the expected effect has been achieved. The slope is stable and safe. From the example of the slope engineering, it is known that the success or failure of the slope engineering in the Xingbian Slope is the systematic work, the success or failure, and the core geological conditions. Reasonable stability analysis, proper reinforcement and treatment measures can prevent the occurrence of instability accidents.

The more realistic and quicker reflection of the changes in the humidity of the machine, is conducive to the safe and stable operation of the generator, because it can grasp the real situation of the hydrogen humidity inside the machine, and research the corrosion changes of the equipment in the generator. The precautionary measures are of great significance; 1 the rational input and maintenance of the hydrogen cooling and drying can be greatly reduced. It can save people's electricity consumption and reduce the labor intensity of workers. Flash uses a rigid, 2640-inch online temperature and humidity monitor with a small level of penetration. The company is in line with international practice and has enabled Liaoning Power Plant to take the lead in realizing on-line monitoring of generator hydrogen humidity on this project.

4.3 Under the condition of permitting conditions, increase the heat exchange area of ​​the rear screen or convection superheater through thermal calculation to achieve the purpose of completely solving the low main steam temperature and the over-temperature burst of the rear screen. The Jiangxi Electric Power Editing Department announced that it is concentrated. I have done a good job in the Jiangxi Electric Power Journal. My editorial department has commissioned Nanchang Colorful Advertising Co., Ltd. as the only advertising agency for this magazine in 2002.

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