Chapter 738

D-40t industrial gas turbine is a new generation of industrial gas turbine after D-30 small industrial gas turbine of Tengfei group.

The technology originally came from the wd-46ml turboprop engine equipped with the improved an-26 and yun-15, and the wd-48sm turbofan engine on yun-15 plus.

It is a typical aircraft reform engine. Because of this, the core engine of d-40t industrial gas turbine is the same as that of wd-46ml turboprop engine and wd-48sm turbofan engine. In addition, Tengfei group has made corresponding adjustments in industrial gas turbine, so the maximum power generation of d-40t industrial gas turbine reaches 3200 kW.

With the use of steam turbine, 10 MW power generation scale can be achieved.

As far as power is concerned, the d-40t industrial gas turbine is not outstanding. It will not be as good as the d-50 marine gas turbine, which has been widely used in the Navy.

However, the d-40t with weak power is a whole generation ahead of the d-50 and other similar gas turbines in technology.

This can be seen from their overall mass. For the same 3000 kW gas turbine, the d-40t is 21.5% less than the d-50.

Compared with similar models of Ge or Mitsubishi, it is about 12% lighter.

The large unit power is among the top industrial gas turbines of the same level, which is mainly due to the application of the most important aviation power achievements in recent years by Tengfei group to the d-40t industrial gas turbine.

Among them is the integral wide chord hollow blade disk displayed by Zhuang Jianye to the energy department some time ago. For this reason, the aviation equipment division of Tengfei group has specially developed a supporting linear friction welding machine, which solves the problem of seamless connection between wide chord hollow blade and rotor.

The nb-250 that Zhuang Jianye showed to energy department at the beginning is the finished product of linear friction welding machine.

When it comes to linear friction welding, it has to be said that the foundation of this kind of welding is friction welding. When Tengfei group was still the 23rd branch, the technology that Tengfei group started with was the friction welding technology of copper aluminum tube developed by Zhuang Jianye and Peng Chuan in Yonghong factory. Later, the transformation from Lilliputian ice cream to refrigeration equipment became easy to apply this technology.

After all previous transformations, Tengfei group gradually expanded its friction welding process, and its in-depth research and excavation did not stop. Especially Peng Chuan, an expert in equipment, has a very persistent nostalgia and has been working silently in friction welding.

Especially during the communication with H company, Peng Chuan obtained a large number of foreign latest developments on friction welding, including linear friction welding and friction stir welding, two new welding processes with great potential in aerospace industry.

Combined with his own attainments in friction welding and the huge amount of resources invested by Tengfei group every year, Pengchuan will not hesitate to attack the key problems of friction welding technology.

A lot of achievements have been made in the past few years, and nb-250 is the most typical representative.

Different from the traditional friction welding, linear friction welding can weld the parts with more complex shape and more demanding material properties, and the weld quality is the same as the material of the parts.

More importantly, linear friction welding can be carried out at room temperature without complex vacuum environment and expensive filling materials. Because of this, the efficiency and cost are more efficient and cost-effective than five axis or seven axis linkage, vacuum electron beam welding and other processes.

If not unexpected, it will be the core manufacturing technology of aeroengine, gas turbine, compressor, fan, gearbox and even complex connecting parts of aircraft in the future.

Thanks to the excellent performance of nb-250 linear friction welding machine, Tengfei group has broken through the world-wide aeroengine manufacturing problem of integral wide chord hollow bladed disk in aviation power, thus reducing the overall quality of d-40t industrial gas turbine and increasing the air compression efficiency of the compressor by four times.

Because of this, the d-40t industrial gas turbine gives full play to the best effect of the coal chemical system conceived by Li Tong, because the super strong compressed air can be fully combined with the pulverized coal crushed into 5 to 50 mm in size, so that it can be fully burned in order to generate higher purity gas.

Of course, excellent gas turbine production technology alone can not solve the key problems of industrial gas turbine in the field of coal chemical industry. How to improve the temperature in front of the turbine and improve the service life of the turbine in high-density solid particles is the technical core of the whole set of coal chemical industry system.

In fact, not only in coal chemical industry, but also in other fields, the core of aeroengine and gas turbine is to improve the temperature before turbine and service life.

In this regard, Tengfei group has been laying out for several years, and has also made some achievements, such as film cooling technology, and the development of high temperature resistant materials such as aluminum titanium alloy.

However, these technologies have either reached the technical limit or are far from being applied. Of course, Tengfei group has also studied the improvement method between the two, such as high temperature resistant ceramic spraying technology, that is, coating a layer of ceramic high temperature resistant layer on the turbine and turbine blades, so as to increase the high temperature bearing capacity of the turbine.

However, for such a coating structure, the Materials Research Institute of Tengfei group, together with several domestic universities and scientific research institutes, has been engaged in more than five years, and has tested thousands of materials and technologies, but it can not break through the key technology.Either the ceramic coating hardens and falls off at high temperature, or the turbine cracks and collapses at high speed.

This is also the reason why Tengfei group has been focusing on the hx-4-1 core engine in recent years. It is not that it does not want to further launch more advanced medium thrust engines and E-class and F-class heavy industrial gas turbines.

The main reason is that the overall technology of the turbine can not keep up, and the temperature in front of the turbine can not be increased, which leads to the insurmountable bottleneck of the turbine gas power plant of Tengfei group.

Originally, it was not known that all these problems could be solved in a short period of time. Zhuang Jianye was also preparing to spend five or ten years on the existing production capacity of aeroengine, waiting for the overall domestic technical level to reach a new level, and was looking for a breakthrough at that time.

As a result, Li Tong, who came to Tengfei group, suddenly asked the technical decision-making level of Tengfei group, such as Zhuang Jianye, in surprise after learning about the difficulties of Tengfei group in turbine gas power plant: "since ceramic based materials and nickel based alloys can't fit together, why not add a transition layer between them? It's like the white rabbit milk candy. There is a thin edible skin under the outer layer of wax paper, which can not only fix the milk candy, but also prevent the wax layer of wax paper from infecting the candy. "

In the past few years, Tengfei group has been working on the direct spraying of ceramic based coatings on nickel based alloys. However, it did not expect that a transition layer was needed in the middle. It was only after listening to Li Tong's tips that it found that the previous practice was really wrong.

After two years of research, CoCrAlY coating, the so-called cobalt based ultra high temperature alloy coating, was developed. The melting point of the high alloy coating is 1425 ℃, and it can work normally between 1000 ℃ and 1280 ℃.

And has a strong hardness and durability.

More importantly, CoCrAlY coating can adapt to a variety of ceramic based heat-resistant coating materials, and the combination of the two can greatly improve the turbine temperature.

It is with these breakthrough technological achievements that the pre turbine temperature of d-40t industrial gas turbine will reach an amazing 1250 degrees Celsius, thus completing the technological leap and becoming the initial model of the second generation turbine gas power plant of Tengfei group.