Gas bearing turbine expander with large gas volume

Abstract

The invention discloses a gas bearing turbine expander with a large gas volume, which adopts gas bearing lubricating. An annular groove is formed in a gas bearing; and a plurality of first exhaust holes which communicate with the annular groove are drilled in the axial direction of the gas bearing, so that hot gas which bears friction passes through the annular groove and then is exhausted into acavity of a machine body through the plurality of the first exhaust holes. According to the gas bearing turbine expander with large gas volume, the bearing capacity and the stability of the gas bearing are improved by increasing number of thrust gas supply hole to increase the gas supply area and improving the exhaust radiating capacity of the gas bearing, so that the expander can reach the expansion amount of 5,000 Nm<3> / h in work; the average isentropic efficiency can reach 86 percent; and the gas bearing turbine expander with the large gas volume is simple in structure, light in weight, convenient to maintain, and obvious in energy saving effect.

Description

technical field [0001] The present invention relates to an improvement of an expander, in particular to an expander that can reach 5000Nm during operation. 3 The expansion capacity per hour, the average isentropic efficiency can reach 86% of the gas bearing turbo expander of the atmospheric volume. Background technique [0002] As the core equipment of the air separation product, the turbo expander basically provides all the cooling capacity of the air separation plant, and its performance directly determines the technical level of the whole set of products. [0003] At present, there are two main lubrication methods for turbo expanders: one is gas bearing lubrication, the other is oil bearing lubrication; the oil bearing has a large bearing capacity and stable operation, but it has many accessories, large volume and heavy weight When the seal fails, the lubricating oil may be brought into the process gas, causing serious safety accidents; the gas bearing has a wide range o...

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Problems solved by technology

[0003] At present, there are two main lubrication methods for turbo expanders: one is gas bearing lubrication, the other is oil bearing lubrication; the oil bearing has a large bearing capacity and stable operation, but it has many accessories, large volume and heavy weight When the seal fails, the lubricating oil may be brought into the process gas, causing serious safety accidents; the gas bearing has a wide range of speed, low friction resistance, low friction power consumption, low temperature rise, low noise, no pollution, and a wide temperature range , simple structure, small size, light weight, convenient installation, operation and maintenance, high reliability, long life, saving power consumption, oil consumption, low operating cost, high economy, comprehensive comparison of oil bearing and gas bearing expander can be found, The gas bearing expander is very cost-effective and has great development prospects and advantages

[0004] However, the gas bearing has the disadvantage of small bearing capacity; at present, the domestic gas bearing turboexpander has an inlet pressure of 0.1-2MPa, an inlet temperature of -270-200℃, an output power range of 0.5-50kW, and a speed range of 10000-200000r / min. Usually the flow range of its inlet state is 10-600Nm 3 / h, converted into a standard gas volume range of 50 ~ 3000Nm 3 / h, the diameter of the expansion wheel is generally less than 140mm, the diameter of the fan wheel is generally less than 180mm; and the scope of application of the oil bearing turboexpander is: the inlet pressure is 0.1-8MPa, the inlet temperature is -200-200℃, the output power is >50KW, the maximum can be Up to hundreds of thousands of kilowatts, the speed range is 5000-100000r / min, and the flow range in the inlet state is > 200Nm 3 / h, converted into a standard gas volume range > 2000NNm 3 / h, the diameter of the expansion wheel is generally greater than 80 mm, and the diameter of the fan wheel is generally greater than 100 mm; therefore, when the design gas volume of the turbo expander is greater than 30000Nm 3 When it is designed as a gas bearing turbo expander, it is difficult to ensure that the gas bearing can withstand large axial and radial loads, so it is generally safer to design an oil bearing turbo expander

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