Flow Path Retrofit

1. Background

With the continued economic development, such problems as shortage of resources and increasing environmental pressure are emerging in various countries and regions around the world. From the Eleventh Five-Year Plan, Chinese government officially launched its energy-saving and emission reduction policies.

At present, many industrial fields have begun their technological innovation and product updates at varying degrees. A large number of new energy-saving products have entered the market and occupied a considerable market share. For example, energy-saving lamps have replaced incandescent lamps and energy-saving motors have replaced ordinary motors.

Compared with foreign countries, the efficiency of domestic small turbine units are more than 10% lower. Given that there are 20,000 sets of small steam turbines in operation in China, over 200 million extra tons of standard coal will be consumed annually compared with advanced foreign turbines, and energy waste is very serious.

Raising the efficiency of small and medium-sized steam turbines is an important prerequisite for achieving the country`s strategic goal of energy conservation and emission reduction. The energy-saving renovation of steam turbine products is imminent.

Based on the international advanced steam turbine technology, QNP independently developed a series of high-speed steam turbines with independent intellectual property rights. By optimizing structure design, increasing speed, improving molded lines and so on, the efficiency can be improved by as high as 16% with parameters unchanged.

2.Application area

1).Residual heat and pressure, renewable energy, waste incineration, biogas, biomass power generation;

2).Heat and power cogeneration and industrial driving in such industries as petroleum, chemical, electric power, metallurgy, pharmaceuticals, building materials, textile printing and dyeing, etc.

3.Key technologies

1)Determine the flow size of each blade stage by flow path optimization program;

2)New type high-speed steam turbine body structure;

3)The replacement of conventional dual-row governing stage by single-row governing stage;4)The adoption of advanced turbine blade profile design, using newly designed fish-head static blade;

5)Structural optimization of small root diameter blade wheel;

6)Monoblock rotor and constant thickness blade wheel;

7)advanced last stage design;

8)Integral shroud technology;

 9)New type blade root grooves.

4.Characteristics

 1)Small size, light weight, long overhaul, high reliability;

 2)Packaged turbine structure, easy to install;

 3)High level of automation;

 4)Up to 16% efficiency increase.

5.Energy Efficiency Improvement Cases

1)The 6MW back-pressure type high-speed and high-efficiency steam turbine developed by our company has a working speed of up to 10,000 rpm, which achieves a significant increase in internal efficiency, and can increase the power generation by approximately 600 kilowatts per hour without affecting the owner's steam consumption. Given 8,000 hours` operation time a year, the set can increase the power generation capacity by 4.8 million kWh for customers. If this capacity can replace outsourcing power, it can save 3.6 million Yuan per year for customers by calculating the outsourcing price of 0.75 Yuan/kWh.

2)The 15MW condensing high speed and high efficiency steam turbine developed by our company has a working speed of up to 8000 rpm and achieves a significant increase in internal efficiency. With the same steam intake, it can increase the power generation by about 770 kilowatts per hour, Given 8,000 hours` operation time a year,, it can increase the power generation capacity by 6.16 million kWh for customers. If this capacity can replace the outsourcing power, it can save electricity bills of 4.62 million Yuan/year according to the outsourcing price of 0.75 Yuan/kWh.

Note: QNP can be responsible for investment and renovation, and adopt the model of contract energy management.