1. Harbin Electric Machinery Co., Ltd. Harbin 150001, Heilongjiang; 2. Harbin Turbine Co., Ltd., Harbin 150000, Heilongjiang; 3. Xuzhou Combustion Control Research Institute, Jiangsu Xuzhou 22100 hydrogen purity method, theoretically illustrates the correspondence between hydrogen purity and gas density. 1 The 600 steam turbine generator produced in China adopts water hydrogen hydrogen cooling method to determine that the winding is water inner cooling, the rotor winding is hydrogen inner cooling, the iron core is hydrogen cooling; hydrogen is used as a cooling medium for the generator, and its temperature and temperature purity Changes in humidity and other factors directly affect whether the generator can operate normally and effectively, so the device for analyzing and detecting hydrogen parameters becomes an important part of the hydrogen control system. Here, the analysis and detection of hydrogen purity in the generator will be elaborated.
Hydrogen is a very light and flammable gas, its specific gravity is only 15 of air. Therefore, using hydrogen as a cooling medium, the generator ventilation loss can be reduced by 6.95, and the friction loss of the rotor is only 0 of the air cooling medium. The heat dissipation capacity of hydrogen is four times that of air. From then on, the efficiency of the generator can be greatly improved, and the operating temperature is lowered. If the original operating temperature is maintained, the generator capacity is also raised accordingly. The efficiency of the hydrogen in the generator can be maintained at 98. For the best working conditions, if the gas purity is too high above 98, the hydrogen consumption will increase, which is unreasonable from the economic point of view. If the gas purity is too low below 95, it will be The efficiency of the generator is reduced, and the internal body contains, the phase, the increase, and the explosive gas is easily formed with the sense gas. It is unsafe to allow the generator to have a hydrogen purity of 90, 95 generator only when the hydrogen supply is insufficient. The hydrogen-filled gas is replaced by a gas replacement method with respect to the parent and hydrogen, and is used as an intermediate medium. Alternatively, the air is displaced from the machine by taking 03 as an example. When the purity of the 02 reaches 95, the charging is stopped, and then the inside of the machine is replaced with hydrogen. 2, the bottom of the motor is sampled, and the hydrogen purity in the generator reaches 95 to end the charging. When the generator is discharging hydrogen, the procedure is reversed, that is, the replacement enthalpy is used, and then the air is replaced. 2. In order to detect the purity of the gas in the gas replacement and operation time of the generator, a complete detection device, that is, a hydrogen purity analyzer and Transmitting device.
The device uses a mechanical density analyzer to monitor the gas purity in the generator, and is composed of a purity fan transmitter operator signal converter alarm component, etc. 1. In the INDI purity indicator; IND2 hydrogen pressure finger; IND3 gas density indicator IND4 generator fan differential pressure indicator; PT1 hydrogen force transmitter; IPT1 purity fan differential pressure transmitter DPT2 generator fan differential pressure transmitter; ADRI operator; SCTI signal converter; IXAI purity alarm component; IXA2 ; force alarm component; usually the density of the two mixed gases is different from the density of these gases under the same temperature and jade force. If the density of the seed gas is known, as long as the density of the mixed gas is measured, the content of the other gas in the mixed gas can be determined. Especially for gases with large differences in density, the test results are more accurate. The relative density of the mixed gas is controlled by a light-loaded constant-speed fan to produce a pressure difference between the passing gas, and the difference between the corpse and the density of the gas in the machine and the geometrical parameter of the fan itself, and the geometry of the fan is heard. When the parameters and speed are fixed, the pressure difference that it can produce directly reflects the density of the gas. The gas density is directly related to the composition of the gas, so the value of the direct 7 and the pass, 4 and 13 changes, as long as the inlet pressure difference of the purity fan is measured, the machine can be understood, 71 and 071 transmitters The density and composition of the gas in the working environment, the actual measurement of the instrument is the pressure difference generated by the fan.
The purity signal is obtained by the generator fan pressure difference and the purity juice fan pressure difference hydrogen pressure signal passing through the divider and the letter converter, and the density is multiplied by the purity meter fan pressure difference and the constant, that is, the purity signal comes from the density signal and Generator fan differential pressure signal.
Purity calculation process 2.
Purity fan differential pressure transmitter output mixed gas differential pressure, + air pressure difference x1053 + 4mA hydrogen pressure transmitter, output 6 internal pressure using this device, you can observe the generator gas at any time Purity. At the same time, the high and low alarm of hydrogen purity is set. When the purity of hydrogen is higher or lower than the alarm value, the alarm will send out an alarm signal, and the on-duty personnel can take corresponding measures according to the actual situation to ensure the normal operation of the unit.
According to the actual situation, the device is optimized, a new type of gas purity analyzer is selected, and the arithmetic signal converter gas purity indicator purity alarm is collected in the body, and the output signals of the milk 2 and 13 can be used. Directly, the purity of the 1 body is detected, and at the same time, it is also possible. The instrument has a check function. After power-on, it first performs self-test. If the self-test is normal, it will enter the inspection state. In addition, the instrument can also set the modified hydrogen purity alarm value on the panel at any time. The operation is simple and convenient, and the internal EEPROM realizes data interruption. Electrical protection.
Hydrogen purity is the most important technical parameter of the generator. Whether the purity of hydrogen can be correctly detected will directly affect the normal operation of the generator set. The optimized device makes the hydrogen purity detection quick and convenient and accurate, which provides a guarantee for the normal operation of the generator set.
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Note:
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