RU2236285C1 - Method of drying gas and device for realization of this method - Google Patents

Abstract

FIELD: devices for drying gas.

SUBSTANCE: proposed method includes compression of gas to be dried in compressor, cooling in first regenerator and expansion in turbo-expander; part of dried gas after turbo-expander (40-50%) is directed to consumer and remaining part (50-60%) after passage through second regenerator is first subjected to separation and then is directed to consumer. Device proposed for realization of this method has motor, compressor, turbo-expander and two regenerators operating in turn; regenerators are provided with two valve chests each; pipe cut into closed loop "turbo-expander-second valve chest" is used for taking dried gas and separator is mounted at outlet of gas after first valve chest.

EFFECT: reduction of power requirements.

3 cl, 1 dwg

Description

The invention relates to the field of gas drying and can be used, for example, for drying air in wind tunnels.

Drying of gas with the help of absorbers, for example almogel, silica gel, is widely spread (Pope A., Goin K. High-speed wind tunnels. - M .: Mir, 1968, p. 93). The disadvantages of this method and devices for its implementation are: cumbersome, since it requires a large amount of absorber, which absorbs 2-3% of the water from its own mass, the need for reactivation of the absorber, high energy consumption.

A known method of drying gas by increasing the pressure in the compressor and subsequent cooling in the heat exchanger (Pope A., Goyn K. High-speed wind tunnels. - M .: Mir, 1968, p. 95). The disadvantage of this method is the high power consumption.

Known adopted for the prototype method of drying gas by condensing and freezing water in the gas, implemented in the cycle of a turbo-refrigeration machine (TXM) (Refrigeration machines, edited by prof. Sakuna I.A., L .: Engineering, 1985, p. 364) . Atmospheric air is supplied to the compressor, where it is compressed, and then to the first regenerator, where it is cooled. When cooling, moisture from the air falls out in the form of a liquid, and then at t <0 ° C - in the form of ice crystals that settle on the surface of the regenerator. Then the air is expanded in a turboexpander, as a result of which, performing external useful work, it is cooled and directed to a heat exchanger in which it is heated, removing heat from the cooled source. After the heat exchanger, air is supplied to the second regenerator, where it is heated at low pressure (while the moisture content of the air increases). Then the air flow with moisture is released into the atmosphere, while the second regenerator is completely drained.

The disadvantage is the shallow degree of air drying, the inability to use dried gas by an external consumer.

A known device adopted for the prototype that implements the above method of drying gas and consisting of an engine, a compressor, a turboexpander, two valve boxes, two regenerators and a heat exchanger (Refrigerators, edited by Prof. Sakuna I.A. L .: Engineering, 1985, p. . 364). Atmospheric air is supplied to the compressor, then through the first valve box to the first regenerator. Then, through the second valve box, they are sent to a turboexpander. After the turboexpander, the cooled air enters the heat exchanger and, passing through the second valve box, enters the second regenerator. Heated and moist air passes through the first valve box and is released into the atmosphere.

The disadvantage of this device is the inability to use dried gas by an external consumer and the shallow degree of gas dehydration.

The objective of the invention is to obtain dry gas for external consumption, a deep degree of gas drying.

The technical result is to reduce energy costs for obtaining dried gas.

The objective and the specified technical result are achieved by the fact that in the method of drying the gas, in which the drained gas is compressed in the compressor, cooled in the first regenerator, expanded in the turboexpander, the feature is that part of the dried gas is 40-50%, after passing through the turboexpander, sent to the consumer, and the rest - 50-60%, after passing the second regenerator, first separated, and then sent to the consumer.

The objective and the indicated technical result are also achieved by the fact that in the device for drying gas, consisting of an engine, a compressor, a turboexpander, two alternately working regenerators with two valve boxes, the peculiarity is that for the selection of the dried gas into a closed loop, the “turbine expander is second valve box ”a pipe is cut in, and a separator is installed at the gas outlet after the first valve box.

The drawing shows a diagram of a device with which gas is dried.

The device (see drawing) consists of an engine 1, a compressor 2, a turboexpander 5; two regenerators 4 and 4 ’, two valve boxes 3 and 3’, pipes 6, 7, 10, 11 and separator 9. Engine 1, compressor 2, turboexpander 5 are installed on one shaft. On the pipes 6, 10 and 11 installed control valves.

Atmospheric air passes through a pipe into a turbo-refrigerating machine (TXM), in which it is cooled, dried, and moistened. Part of the drained air, approximately 40-50%, is sent to consumer 8 through a pipe 6. The remaining part of the drained air is 50-60%, used to remove water and ice from the TXM, while the moist air at the outlet of the TXM is sent to the separator 9. Air after the separator 9 through the pipe 10 enters the consumer 8, and water and ice are thrown into the drainage system.

The device operates as follows. The engine 1 drives the compressor 2. The wet gas is sucked in by the compressor 2 and fed through the first valve box 3 to the first regenerator 4, where the gas is cooled, while the water vapor contained in the gas condenses and partially freezes. Ice crystals are deposited on the surface of the regenerator 4. The dried gas through the second valve box 3 ’is sent to the turbine expander 5, where it is additionally cooled. Part of the dried gas is 40-50%, through a pipe 6 cut into a closed loop (“turboexpander is the second valve box”) 7, is supplied to the consumer 8, and the remaining gas is 50-60%, through the second valve box 3 'sent to the second regenerator 4 ', where the previously accumulated ice and water are washed out and the nozzle of the regenerator 4' is cooled.

Regenerators 4 and 4 ’work alternately. The first (4) - with a pre-cooled nozzle to dry the gas coming from the compressor, while water and ice accumulate in it, and the second (4 ’) - to wash water and ice out of it and cool the nozzle. Regenerators automatically switch after 1-2 minutes.

A mixture of wet gas, water and ice, passing the first valve box 3, enters the separator 9. The dried gas through the pipe 10 is sent to the consumer 8, and water and ice are discharged through the pipe 11 into the drainage system.

Deep drying is achieved by cooling the gas and separating the resulting water and ice in the separator 9.

Computational studies show that the application of the invention will reduce energy consumption by more than 20% compared with the drying of gas by the absorption method.

Claims (2)

1. A method of drying gas, in which the drained gas is compressed in a compressor, cooled in the first regenerator, expanded in a turboexpander, characterized in that a portion of the dried gas is 40 ÷ 50%, after passing through a turboexpander, is sent to the consumer, and the remainder is 50 ÷ 60%, after passing the second regenerator, is first separated, and then sent to the consumer. 2. A device for drying gas, consisting of an engine, a compressor, a turboexpander, two alternately working regenerators with two valve boxes, characterized in that a pipe is cut in for the drainage gas to be taken into a closed loop “turboexpander — the second valve box”, and after the gas outlet the first valve box mounted separator.