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Chapter 738 Second Generation Turbine Gas Power Plant

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    The d-40t industrial gas turbine is a new generation of industrial gas turbine launched by Ascendas Group after the d-30 small industrial gas turbine.

    Its technology was originally derived from the wd-46ml turboprop engine equipped on the improved An-26 and Yun-15, and the wd-48sm turbofan engine on the Yun-15plus.

    It is a typical aeroderivative aircraft. 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. In addition, Ascendas Group has made corresponding progress in industrial gas turbines.  Adjustment, so the maximum power generation power of the D-40t industrial gas turbine reaches 3200 kilowatts.

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

    In terms of power, the d-40t industrial gas turbine is not outstanding and will be just next to the medium-sized gas turbine. It is even inferior to the d-50 marine gas turbine that has been widely used in the navy.

    However, the weak D-40t is technically a generation ahead of similar gas turbines such as the D-50.

    This can be seen from their overall mass. It is also a 3,000-kilowatt gas turbine, and the D-40t is 21.5% lighter than the D-50.

    Compared with similar models from GE or Mitsubishi, it is also about 12% lighter.

    The large unit power is among the best among industrial gas turbines of the same level. This is mainly due to the application of Ascendas Group¡¯s most important aviation power achievements in recent years to the D-40t industrial gas turbine.

    Among them is the integrated wide-chord hollow blade blisk that Zhuang Jianye wanted to display in the energy department some time ago. For this purpose, the aviation equipment division of Ascendas Group specially developed a matching linear friction welding machine to solve the problem of seamless wide-chord hollow blades and rotors.  Connection issues.

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

    When talking about linear friction welding, we have to talk about the large-scale friction welding that is the basis of this type of welding. The technology that Tengfei Group relied on when it was still the 23rd factory was the copper and aluminum technology developed by Zhuang Jianye and Peng Chuan when they were at the Yonghong factory.  Tube friction welding process, after which the transformation of refrigeration equipment from Little Man Ice Cream became easy to apply this technology.

    After that, Tengfei Group went through successive transformations and gradually expanded the friction welding process. At the same time, in-depth research and excavations did not stop. Especially Peng Chuan, an expert in equipment, has a very persistent nostalgia and has been working quietly in friction welding.

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

    Combining his own accomplishments in friction welding and Tengfei Group¡¯s massive annual resource investment, Peng Chuan pounced on the research of friction welding technology without hesitation.

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

    Unlike traditional friction welding, linear friction welding can weld components with more complex shapes and more demanding material properties, and the weld quality is the same as the component material.

    More importantly, linear friction welding can be performed at room temperature without the need for complex vacuum environments and expensive filling materials. Because of this, the efficiency and cost of use are higher than those of five-axis or seven-axis linkage, vacuum electron beam welding and other processes.  ,cheaper.

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

    It is precisely thanks to the excellent performance of the nb-250 linear friction welding machine that Tengfei Group has broken through the world's aviation manufacturing problem of integrated wide-chord hollow blade blisk in aviation power, thus making the D-40t industrial gas turbine  While the overall quality is reduced, the air compression efficiency of the air compressor is increased by 4 times.

    It is precisely because of this that the d-40t industrial gas turbine allows the coal chemical system conceived by Li Tong to exert its best effect, because the super compressed air can be fully combined with coal powder crushed into 5 to 50 mm in size, so that it can be  Complete combustion to produce gas with higher purity.

    Of course, superb gas compressor production technology alone cannot solve the key problems of industrial gas turbines in the field of coal chemical industry. How to increase the temperature in front of the turbine and improve the service life of the turbine in high-density solid particles is the technology in the entire coal chemical industry system.  core.

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

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

    But these technologies have either reached their technical limits or are still far away from application. Of course, among the two,Ascendas Group has also researched ways to improve performance, such as high-temperature resistant ceramic spraying technology, which involves coating the turbine and turbine blades with a ceramic high-temperature resistant layer to increase the turbine's high-temperature endurance.

    " However, it is such a coating structure. The Materials Research Institute under Ascendas Group has worked with several domestic universities and research institutes for more than five years, testing thousands of materials and processes, but can't break through the key technologies.

    Either the ceramic coating hardens and falls off at high temperatures, or it cracks and collapses when the turbine is running at high speed.

    This is also the reason why Ascendas Group has only 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-duty industrial gas turbines.

    The main reason is that the overall technology of the turbine cannot keep up, and the temperature in front of the turbine cannot increase, causing Ascendas Group's turbine gas power plant to encounter an insurmountable bottleneck.

    Originally, I didn¡¯t know that all this would be solved in the year of the monkey. Zhuang Jianye was also prepared 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 seek breakthroughs.

    As a result, Li Tong came to the door. After learning about Ascendas Group's difficulties in turbine gas power units, he suddenly asked Zhuang Jianye and other Ascendas Group's technical decision-makers in surprise: "Since ceramic-based materials and nickel-based alloys cannot be combined, why not combine the two?"  Adding a transition layer between them? Just like the White Rabbit toffee, there is also a thin edible layer under the outer layer of wax paper, which can fix the toffee without letting the wax layer of the wax paper infect the candy."

    It can be said that the words awakened the dreamer. In the past few years, Tengfei Group has been working on spraying ceramic-based coatings directly onto nickel-based alloys, but it did not expect that a transition layer was needed in the middle. It was not until Li Tong¡¯s prompts that  I found that what I did before was really wrong.

    So we immediately conducted research according to Li Tong's ideas. After two years of research, we finally developed cocraly coating, the so-called cobalt-based ultra-high temperature alloy coating. The melting point of high-alloy coating is 1425 degrees Celsius, which can be between one thousand to one thousand two thousand degrees Celsius.  Works normally between 180 degrees Celsius.

    And it has strong hardness and durability.

    What¡¯s more important is that the cocraly coating can be adapted to a variety of ceramic-based heat-resistant coating materials. When the two are combined, the turbine temperature number will increase significantly in an instant.

    It is precisely because of these breakthrough technological achievements that the temperature in front of the turbine of the d-40t industrial gas turbine can reach an astonishing 1250 degrees Celsius, thus completing a technological leap and becoming the initial model of Ascendas Group's second-generation turbine gas power unit.

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