Device for producing oxygen from atmospheric air

 

(57) Abstract:

The invention relates to the field of adsorption technique and can be used for air separation by pressure swing adsorption with getting the gas mixture with a high content of oxygen. The unit consists of an air compressor, drying unit and the adsorption unit comprising a receiver, two filled with the adsorbent of the adsorber, the inlet pipe which is connected to the compressed air supply and output connections to the receiver, pipelines connecting the adsorbers with a receiver, a source of compressed air, the consumer, and two parallel pipelines connecting the output connections of the adsorbers between them, mounted with controllable valves and narrowing devices supply washers, and communicating sections consumable washers different and are chosen in a special way valves control the gas flow and the control unit, switch valves in sequence to realize in the adsorbers cycle adsorption-regeneration. The technical result is the optimization of the flow rate of product gas supplied to the regeneration of the adsorbent, the improvement effeat energy. 1 Il., table 1.

The invention relates to the field of adsorption technique and can be used for air separation by pressure swing adsorption with getting the gas mixture with a high content of oxygen.

Known pressure swing adsorption plant for air separation to obtain a gas mixture with a high content of oxygen, consisting of an air compressor and an adsorption unit comprising a receiver, two filled with the adsorbent of the adsorber, the inlet pipe which is connected to the compressed air supply and output connections to the receiver, pipelines connecting the adsorbers with a receiver, a source of compressed air, consumers and each other, the valves control the gas flow and the control unit performs switching of the valves in sequence to realize in the adsorbers cycle adsorption-regeneration /see application France N 2569352, class. B 01 D 53/02, A 61 M 16/10, 1986/

A disadvantage of the known device is the lack of regulation of the gas flow with a high content of oxygen supplied to the regeneration of the adsorbent independently in each of the adsorbers that are not pozvolyaet efficiency of the installation as a whole.

The closest adopted for the prototype, is the plant for oxygen-enriched air, containing a suction unit /compressor/ air dryer for drying air and the adsorption unit, consisting of two adsorbers with adsorbent receiver, valves, connecting pipes /see U.S. patent N 4491459, CL 55-163, 1985/

Due to the inequality of the operating characteristics of the adsorbers, which always takes place in real devices of this type /differences in the quality of the adsorbent, the difference of the hydraulic resistance of the layer, the difference of the geometric dimensions, and these differences the greater, the larger the size and the more complex the design/ efficiency of the installation operation below the maximum achievable as to reduce the influence of this factor is necessary to ensure that the gas supply to the regeneration of each of the adsorbers with a flow rate corresponding to its individual characteristics, which in this design is not provided.

The proposed device for producing oxygen from air, comprising an air compressor, drying unit and the adsorption unit comprising a receiver, two filled with the adsorbent of the adsorber, the inlet is Edinaya adsorbers with a receiver, the source of compressed air, consumers and each other, the valves control the gas flow and the control unit performs switching of the valves in sequence to realize in the adsorbers cycle adsorption-regeneration, characterized in that the setting input a second pipeline connecting the outlet of one adsorber with the outlet pipe of the other, and the first and second pipelines installed valves and orifice type of expenditure washers, and communicating sections consumable washers different and are chosen in a special way.

The proposed installation, unlike the prototype, is composed of the adsorption unit two parallel pipelines connecting the output connections of the adsorbers, mounted with controllable valves and expenditure washers of different diameters. This allows for debugging of the technological cycle to optimize the flow of product gas supplied to the regeneration of the adsorbent, independently for each of the adsorbers, which increases the efficiency of the regeneration process and improves the performance of the entire installation without additional energy costs.

The drawing shows a diagram of the config block 3, connected by pipelines. The adsorption unit 3, in turn, consists of two adsorbers AD1, AD filled with sorbent layer which is preferential sorption of nitrogen, receiver AK, in which there is an accumulation of product gas and averaging its concentration, as well as smoothing of pressure fluctuations caused by cyclical operation of the installation, and piping systems a, b, C, g, d, e, connecting the adsorbers AD1, AD and receiver AK among themselves, with the source of compressed air, with the consumer and with a drainage line. On pipelines installed controlled valves K1.., K6, check valves K01, K02 and orifice type of expenditure washers DRN, DRN provide control of gas flows in the adsorption unit, the control unit BU, switch valves K1,..., K6 for alternate implementation of the adsorbers AD1, AD cycle adsorption-regeneration.

The device operates as follows.

Air compressor 1 sucks in air, compresses it to a pressure of 8...10 kgf/cm2and submits to the input of the drying unit 2, in which the moisture is separated and the oil. Next, the dried compressed air is fed to the inlet of the adsorption unit 3. B Is D1, AD, alternately goes through cycles of adsorption-regeneration, and when one of them is in the process of adsorption, the other is regenerated.

Compressed air passing through the pipe and through the open valve K1, is fed to the inlet of the adsorber AD1 and moves through the bed of sorbent in which there is preferential adsorption of nitrogen molecules. With increasing gas pressure in the adsorber, the oxygen concentration at the outlet increases and reaches a value of 90...95%.

Simultaneously, from the adsorber AD are reset remaining after the previous stage adsorption enriched nitrogen gas, drainage through open valve K4 and drainage piping B. By decreasing pressure in the adsorber AD results in the release of nitrogen molecules absorbed by the sorbent previously, i.e., its regeneration.

When the pressure of the gas in the adsorber AD1 magnitude greater than the pressure in the receiver AK, check valve K01 is automatically opened and the product gas output AD1 enters the receiver AK. Simultaneously, the valve opens K5 and product gas by pipeline in expenditure through the washer LFPR 1 with optimal flow enters the outlet of the adsorber AD and then through the layer of sorbent and the meters of gas.

After a certain period of time the drain valve K4 is closed and in the adsorber AD there is a partial pressure recovery due to the ongoing supply of product gas output AD1.

During the purge and partial recovery of the pressure in AD product gas continues to flow into the receiver AK, through the check valve K01, compensating for the loss of pressure in the receiver caused by the selection of gas to the consumer.

When the pressure of gas in AT the optimal value, the valve K5 and K1 closes and opens the valve K2 and K3 and the cycle is repeated so that the adsorber AD begins phase adsorption, and in the adsorber AD1 - stage regeneration and purge and partial pressure recovery in AD1 is gas output AT through the open valve K6 pipeline g with optimal flow determined pass-section expenditure washer DRN, and closing of the valve K3, and loss of pressure in the receiver AK caused by the selection of gas to the consumer, recovered by feeding the product gas output AT through the check valve K02 pipeline D.

Selection of flow sections consumable washers to optimize the regeneration of the sorbent is carried shall provide the approximate diameter of the hole consumable washer according to the following formula

< / BR>
where d is the diameter of the hole consumable washer, cm;

3,6210-2the factor that determines the minimum value of the purge gas flow rate through a unit cross-sectional area of the canister (determined experimentally), kg/(BSD2);

S is a sectional area of the adsorber, cm2;

T is the temperature of the gas before spending washer, K;

- - coefficient of consumption expenditure washers;

P is the calculated value of pressure adsorption, kgf/cm2;

B*- coefficient of the gas type, in our case, B*= 0,417 (for oxygen at the supercritical pressure drop).

In the manufacture of the pipelines, G establish expenditure washers with a hole diameter equal to the estimated value of d. During the debugging process, record the pressure value in each of the adsorbers in the late stages of adsorption. The diameter of the hole consumable washers installed in the pipeline, through which the purging of the adsorber, with more pressure in the late stages of adsorption when installed in both pipelines expendable washers with hole diameter d, is determined experimentally from the condition of maximum oxygen concentration by a consistent increase from C installation the following results were obtained (see table).

Thus, the proposed device for producing oxygen from atmospheric air allows for the same energy cost as the prototype, to get a higher specification.

Device for producing oxygen from air, comprising an air compressor, drying unit and the adsorption unit comprising a receiver, two filled with the adsorbent of the adsorber, the inlet pipe which is connected to the compressed air supply and output connections to the receiver, pipelines connecting the adsorbers with a receiver, a source of compressed air, consumers and each other, the valves control the gas flow and the control unit performs switching of the valves in sequence to realize in the adsorbers cycle adsorption - regeneration, characterized in that the installation entered the second pipeline, connecting the outlet of one adsorber with the outlet pipe of the other, and the first and second pipelines installed valves and orifice type of expenditure washers, and communicating sections consumable various washers and hole diameter of one of them ODA is, predelay minimum value of the purge gas flow rate through a unit cross-sectional area of the canister (determined experimentally), kg/(s cm2);

S is a sectional area of the adsorber, cm2;

T is the temperature of the gas before spending washer, K;

- coefficient of consumption expenditure washers;

R - calculated value of pressure adsorption, kgf/cm2;

IN*= 0,417 - coefficient of the gas type,

while the diameter of the holes other consumable washers installed in the pipeline, through which the purging of the adsorber, with more pressure in the late stages of adsorption when installed in both pipelines expendable washers with hole diameter d, is determined experimentally from the condition of maximum oxygen concentration by successive increasing values from d to d1with a step of 0.05 - 0.1 mm

 

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