Application Analysis of Super High Power High Voltage Frequency Converter in Compressor

Anyang surplus fertilizer 800,000 tons of urea project in July 2010 approved by the higher authorities for the record, the location is located in Huaxian, the planned construction period for the July 2010 - December 2012, the adoption of cleaner production technology is the world leader Of the gasification process using the world's advanced coal-water slurry gasification technology; purification process using sulfur-tolerant transformation, low-temperature methanol wash, liquid nitrogen washing and import of sulfur recovery technology; ammonia synthesis process using Casas low-pressure synthesis process; urea Synthesis process imported CO2 gas extraction process.

The core technology in the whole system is the most advanced in the world, the engineering configuration is the most optimized, the energy system is the most reasonable, and the production cost will surely be the lowest. Upon completion, it will be the largest urea production plant in Henan Province.

Process principle and process description

Ammonia refrigeration is mainly through a typical compression refrigeration cycle (compression → condensation → throttling → evaporation), liquid ammonia, this good refrigerant (its latent heat of evaporation) recycling, so as to provide different users with different freezing levels of cold Volume, while recycling ammonia ammonia users due to heat generated by ammonia, through again booster, cooling liquid ammonia for ammonia users to recycle.

Ammonia compressor driven by the motor, the motor and the compressor connected by a gear box, through the size of the gear 176/29 6.069 to control the speed ratio to adjust the compressor speed, the motor speed control by the Richterfort high-voltage inverter control, frequency The power frequency of 50Hz power frequency converter to 0-50Hz frequency power to control the motor speed, motor speed 1490r / min according to the speed ratio to control the compressor speed 9043r / min compressor work done in this way.

Energy efficiency

At present, the main compressor units such as syngas compressor, ammonia compressor, and carbon dioxide compressor are mainly produced by means of "boiler + turbine drive" in the design of an ammonia plant with an annual output of 400,000 tons and above. This kind of old construction mode has the following problems in the new economic form and the national background of energy conservation and emission reduction:

1. In the newly-built project, the way of "boiler + steam turbine drive" has high investment, large area and long construction period.

2, the plant put into operation, the high cost of operation and maintenance of coal-fired boilers.

3, low energy efficiency of coal-fired boilers, steam plant run, take serious, serious environmental emissions of flue gas emissions.

4, poor performance of system regulation, low productivity, large energy waste.

5, boiler steam production water consumption, high coal consumption index, the pressure of production costs.

Combined with the above factors, combined with the current domestic high-power high-voltage variable frequency drive technology, mature applications. The project in the design to consider the use of electric drive instead of "boiler + turbine drive."

The use of electric drive system, will directly save the boiler area, construction investment, and follow-up operation and maintenance costs and environmental pollution, to provide production efficiency.

From the above two methods of comparison analysis, the electric drive has obvious economic advantages. Not only can save the project investment costs, construction cycle, access to significant business benefits; and can achieve good social benefits. Adopt the new energy-saving, environmental protection and efficient structure model, in line with the new business model, energy conservation, sustainable development policy.

Conclusion

Through the analysis and practice of the compressor drive system of the above ammonia plant, it is proved that the electrical drive system with high-voltage frequency conversion as the core can fully meet the demand for the speed and gas quantity adjustment of the compressor in the chemical production; and considerable investment in project operation Economy Profit. The implementation of this project has provided new ideas and new methods for the comprehensive problems of energy and economy, environmental protection and efficient production of ultra-high-power compressor units in the chemical industry. It is worth the energy utilization, energy conservation, environmental protection and production construction in the chemical production field. Transformation projects actively promote. The successful commissioning of the project also confirmed that Leader and Fawer has a greater leading technology in the ultra-high-power inverter technology and the perfect supporting solution. It further laid the position of Leader and Fulfillment as the leading high-voltage frequency converter.

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