Efficient post-pressurization turbine expansion machine with adjustable nozzle and gas bearings

Abstract

The invention discloses an efficient post-pressurization turbine expansion machine with an adjustable nozzle and gas bearings. The turbine expansion machine comprises a machine body, a rotor, a turbine volute and a pressurization wheel volute and further comprises an expansion wheel, the left gas bearing, the right gas bearing and a pressurization wheel which are arranged in sequence, wherein the turbine volute is provided with an end cover. The expansion machine further comprises the adjustable nozzle arranged in the turbine volute, a pneumatic executing mechanism, a connecting sleeve assembly and a heat insulating sleeve assembly, the connecting sleeve assembly comprises a first connecting sleeve and a second connecting sleeve, and the heat insulating sleeve assembly is fixedly arranged between the first connecting sleeve and the second connecting sleeve. The adjustable nozzle is arranged between the end cover and the heat insulating sleeve assembly and provided with a connecting rod of a conical structure, and rotation of the connecting rod can adjust the gas flow rate of the adjustable nozzle. According to the efficient post-pressurization turbine expansion machine with the adjustable nozzle and the gas bearings, the gas bearings are adopted to replace oil bearings to achieve the large gas quantity, the cost is also saved by 4 / 5 or over, and meanwhile the technical problem caused by the scheme of combination of the adjustable nozzle and the gas bearings is solved.

Description

Technical field: [0001] The invention relates to the field of air separation equipment, in particular to a high-efficiency post-pressurization adjustable nozzle gas bearing turbo expander. Background technique: [0002] With the expansion of the main domestic air separation equipment manufacturers from eight in the 1990s to nearly a hundred at present, the market competition is becoming more and more fierce. Often there are dozens of companies bidding for an air separation project. The on-site scene is extremely tragic. To win in this situation, the product must have the advantages of beautiful appearance, convenient use, high cost performance, energy saving and emission reduction, etc. The main lies in the technical level of the product and the competition of the brand. As the core equipment of air separation products, the performance of turboexpander directly determines the technical level of the whole set of products. [0003] With the transformation and development of s...

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Problems solved by technology

[0005] In view of this, individual companies boldly try to adopt the technical solution of combining air bearings and adjustable nozzles. However, in order to meet the requirements of large air volume, the diameter of the expansion wheel needs to be 120 mm, and the diameter of the booster wheel needs to be 142 mm to meet the air volume. This has reached the limit of the rotor size of the domestic gas bearing expander, which obviously has great technical difficulties. At present, there is no adjustable nozzle gas bearing turbo expander product with similar technical parameters, so the gas bearing must be considered. The bearing capacity of bearings and the stability of equipment operation under variable working conditions

At the same time, large-diameter expansion wheels and supercharging wheels will bring many new technical problems, such as large-sized parts assembled together, and the axial gap between each part is relatively large, resulting in cold running and waste of energy; At the same time, assembly and disassembly of large-sized parts will also cause assembly errors to affect the performance of the equipment, and it is inconvenient to disassemble; the rigidity and load-carrying capacity of large-sized air bearings are reduced, which affects the stability, reliability and service life of the equipment; the nozzle adjustment structure adopts artificial Handwheel on-site adjustment, inconvenient operation and low efficiency

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