D-40T industrial gas turbine is a new generation of industrial gas turbine launched after the D-30 small industrial gas turbine of Ascendas Group.

Its technology was originally derived from the WD-46ML turboprop engine equipped with the improved An-26 and Y-15 and the WD-48SM turbofan engine on the Y-15plus.

Because of this, the core engine of the D-40T industrial gas turbine is the same as the WD-46ML turboprop engine and the WD-48SM turbofan engine, and the Tengfei Group has made corresponding adjustments in the industrial gas turbine, so the maximum power generation power of the D-40T industrial gas turbine reaches 3200 kilowatts.

When used in conjunction with steam turbines, it can achieve a power generation scale of 10 megawatts.

In terms of power, the D-40T industrial gas turbine is not outstanding, and it will rub the edge of a medium-sized gas turbine, and it is even inferior to the D-50 marine gas turbine, which has been widely used in the navy.

However, the weak D-40T is a whole generation ahead of similar gas turbines such as the D-50 in technology.

This can be seen from their overall mass, the same 3,000 kilowatt class gas turbine, D-40T is 21.5% lighter than D-50.

It is also about 12% lighter than similar models from GE or Mitsubishi.

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

Among them, Zhuang Jianye wanted the energy department to show the integral wide-chord hollow blade blisk some time ago, for which Tengfei Group's aviation equipment division specially developed a supporting linear friction welding welding machine, so as to solve the problem of seamless connection between the wide-chord hollow blade and the rotor.

The NB-250 that Zhuang Jianye originally showed to the energy department was the finished product of the linear friction fusion welding machine.

Speaking of linear friction welding, we have to say that the basic type of friction welding, when Tengfei Group was still the 23rd branch of the factory, the technology that Zhuang Jianye and Peng Chuan researched when they were in Yonghong factory is the copper and aluminum tube friction welding process, and then the transformation of refrigeration equipment from villain ice cream becomes easy to apply this technology.

After the transformation of Tengfei Group, the friction welding process has been gradually expanded, and the in-depth research and excavation have not been interrupted, especially Peng Chuan, an expert in equipment, has a very persistent nostalgia for the old plot, and has been working silently in friction welding.

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

Combined with his own attainments in friction welding, as well as Tengfei Group's annual massive resource investment, Peng Chuan did not hesitate to pounce on the research of friction welding technology.

A lot of results have been achieved in a few years, and the NB-250 is the most typical representative.

Unlike conventional friction welding, linear friction welding can weld parts with more complex shapes and more demanding material properties, and the weld quality is the same as the part material.

What's more, linear friction welding can be carried out at room temperature without the need for complex vacuum environments and expensive filler materials, which is why processes such as vacuum electron beam welding are more efficient and cost-effective than five- or seven-axis linkage.

If nothing else, it will be the core manufacturing technology of the future aviation engine and gas turbine air compressors, fans, casings and even complex connection parts of aircraft.

It is thanks to the excellent performance of the NB-250 linear friction welding machine that Tengfei Group has broken through the global aviation manufacturing problem of integral wide-chord hollow blade blisk in one fell swoop in aviation power, thereby reducing the overall quality of the D-40T industrial gas turbine and increasing the air compression efficiency of the air compressor by 4 times.

Because of this, the D-40T industrial gas turbine makes the best use of the coal chemical system conceived by Li Tong, because the super compressed air can be fully combined with the pulverized coal pulverized into 5 to 50 mm in size, so that it can be fully burned to produce higher purity gas.

Of course, the superb air compressor production technology alone can not solve the key problems of industrial gas turbines in the field of coal chemical industry, how to increase the temperature before the turbine and improve the service life of the turbine in high-density solid particles is the technical core of the whole coal chemical system.

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

In this regard, Tengfei Group has been laying out for several years and has also achieved some results, such as air film cooling technology, and the development of high-temperature resistant materials such as aluminum and titanium alloys.

However, these technologies have either reached the technical limit, or they are still far from the application, of course, the improvement method between the two, Tengfei Group also has research, such as high-temperature ceramic spraying technology, that is, the turbine and turbine blades are coated with a ceramic high-temperature layer, so that the high temperature bearing capacity of the turbine increases.

However, it is such a coating structure, and the Materials Research Institute under Tengfei Group has been engaged in more than five years in conjunction with several universities and scientific research institutes in China, and has tested thousands of materials and processes, but it is impossible to break through the key technologies.

Either the ceramic coating peels off at high temperatures, or cracks and collapses under high-speed turbine operation.

This is also the reason why Tengfei Group has only revolved around the HX-4-1 core engine over the years, not because it does not want to further launch more advanced medium-thrust engines and E-class and F-class heavy-duty industrial gas turbines.

The main reason is that the overall technology of the turbine cannot keep up, and the temperature before the turbine cannot be increased, resulting in an insurmountable bottleneck for the turbine gas power unit of Tengfei Group.

Originally, I didn't know that all this could be solved in the Year of the Monkey, and Zhuang Jianye was also ready to use the existing aviation production capacity for five or ten years, waiting for the overall domestic technical level to reach a higher level, and then seeking a breakthrough.

As a result, after learning about the predicament of Tengfei Group in the turbine gas power unit, Li Tong, who came to the door, suddenly asked Zhuang Jianye and other technical decision-makers of Tengfei Group in surprise: "Since the ceramic-based material and nickel-based alloy cannot be combined, why not add a transition layer between the two? Just like the white rabbit toffee, there is also a thin edible skin under the outer layer of wax paper, which can not only fix the toffee, but also prevent the wax layer of the wax paper from infecting the candy." ”

In the past few years, Tengfei Group has been committed to spraying ceramic-based coatings directly onto nickel-based alloys, but it didn't expect that a transition layer needed to be made in the middle, until I listened to Li Tong's prompt, and found that it seemed that the previous approach was really wrong.

So immediately according to Li Tong's ideas of research, after two years of research, finally developed the CoCrAlY coating, that is, the so-called cobalt-based ultra-high temperature alloy coating, the melting point of the high-alloy coating is 1425 degrees Celsius, can work normally between 1,000 and 1,280 degrees Celsius.

And it has strong hardness and durability.

What's more, the CoCrAlY coating can be adapted to a variety of ceramic-based heat-resistant coating materials, and the combination of the two can greatly increase the turbine temperature figure instantaneously.

It is with these breakthrough technological achievements that the pre-turbine temperature of the D-40T industrial gas turbine will reach an astonishing 1250 degrees Celsius, thus completing the technological leap and becoming the initial model of the second generation of turbo gas power units of Ascendas Group.