November 15, 2017, PetroChina Hohhot Petrochemical Company Medium-pressure Steam Decompression Power Generation Project passed the power generation and acceptance of the grid, the core equipment for the steam screw expander shaft seal with a Japanese machine sealing for high temperature and pressure steam workers Developed combined carbon floating ring seal. The carbon ring seal leakage than the traditional design of about 40%, while meeting the harsh conditions can be continuous and stable operation of the success of the product marks the Japanese machine sealed at high parameters Carbon ring seal has reached a new level, and can be widely used in medium-pressure steam pressure recovery power generation projects.
Unit parameters: Sealing shaft diameter: 230mm
Expander inlet pressure: 2.35MPa Inlet temperature: 430 ° C
Expander outlet pressure: 1.2MPa outlet temperature: 300 ℃
Background of the project:
Most production-oriented enterprises need to convert high-pressure steam into low-pressure steam needed for production by reducing the temperature and pressure, and recover the pressure difference of steam by using the screw expander can not only replace the function of temperature-reducing and pressure-reducing device, Decompression loss in the process of conversion into a power output for power generation or drive other power equipment.According to estimates, the use of screw expansion machines to replace the original medium pressure steam temperature reduction and decompression equipment, 1t / h of medium pressure steam can be an annual enterprise Bringing 170,000 yuan of generating revenue, while saving 84 tons of standard coal, both good economic benefits, but also to protect the surrounding environment.
According to China's 13th Five-Year Plan, about 13,143MW of waste heat recovery power generation is available in the petrochemical, steel, smelting and power industries, of which 30% comes from the recovery and utilization of steam pressure differential energy. This market has great potential.