Introduction to Efficiency Improvement and Energy saving Technologies

for Steam Turbine Flow Structure Technical Renovation

1. Keep the original ground foundation, adjustment, and auxiliary system of the steam turbine unit unchanged, and complete the design and production preparation work before the turbine shutdown within a compression shutdown renovation period of 40 days plus 60 days, for a total of 100 days. The original unit's upper cylinder and rotor assembly, partition, and generator rotor assembly are returned to the factory for processing, testing, and pre assembly of the unit.

2. For models with sub high temperature and sub high pressure, the original set of rotor structure is utilized. Through thermal calculation, the spacing between the original pressure stages is selectively increased by 2-8 stages, the impeller diameter is reduced, new elongated profile blades and baffles are configured, and the original gas seal structure is modified and optimized to increase the flow capacity of the unit.

3. Add a cylinder sleeve structure, which is mainly made of castings or forgings, reinforced with baffle sleeves, and matched with newly added pressure stages, baffles, etc. The purpose is to increase the working airtightness of the new pressure stage, reduce air leakage, enhance operational safety, and improve the unit's power capacity.

4. Conduct dynamic balance tests on the turbine rotor assembly and the original generator rotor assembly to address abnormal vibration during unit operation. Perform auxiliary maintenance work such as pressure suppression, dust removal, and drying on the generator set synchronously.

5. Cleaning and partial pipeline modification of the condensing system of the original steam turbine auxiliary equipment and condensing unit will be carried out to improve system stability and heat transfer efficiency, and assist in enhancing the power generation capacity of the unit system.

6. The high-temperature and high-pressure models have a forged rotor structure, and other methods of improving efficiency remain unchanged except for the inability to increase pressure levels and sleeve structures. At the same time, based on the actual operating conditions of the unit, if necessary, the same principle flow structure technical transformation and efficiency improvement can be implemented by replacing the rotor assembly and increasing the pressure level.

This type of renovation method has the characteristics of low investment, short renovation period, and significant energy-saving and efficiency improvement. Under the same working conditions of the original unit, the energy-saving and efficiency improvement ratio reaches more than 12%, and the economic and social benefits are both very considerable. The investment amount of a single project is between 3-10 million yuan.