System for separating and extracting high-purity oxygen through air adsorption

Abstract

The utility model discloses a system for adsorbing, separating and extracting high-purity oxygen from air, which comprises two groups of adsorber units which are respectively connected with a gas inlet pipeline, a first gas collecting and buffering pipeline, a second gas collecting and buffering pipeline and a third gas collecting and buffering pipeline, and a buffer tank unit and an exhaust unit are connected among the first gas collection buffer pipeline, the second gas collection buffer pipeline and the third gas collection buffer pipeline. The device has the beneficial effects that a plurality of adsorbers are adopted, the adsorption separation is divided into three time periods, namely an early stage, a middle stage and a later stage, and oxygen separated and produced by the adsorbers is respectively subjected to collection and caching, storage and purification, screening and shunting and secondary adsorption and separation for oxygen production, so that oxygen with the purity of 99.5% is obtained, and an adsorption separation system requires compressed air input at a preceding stage; and the working pressure ranges from 0.35 MPa to 0.45 MPa.

Description

Technical Field

[0001] The utility model relates to the technical field of oxygen purification, in particular to an air adsorption separation and extraction high-purity oxygen system. Background Technique

[0002] The process principle of air adsorption separation and extraction of high-purity oxygen is that oxygen and nitrogen in the air are input into a clean compressed air in an adsorber filled with molecular sieve. Due to the different diffusion rates of oxygen molecules and nitrogen molecules on the surface of the molecular sieve in the adsorber, the oxygen and nitrogen in the gas have different diffusion speeds in the micropores of the molecular sieve and different adsorption forces. Under the condition of gas phase equilibrium, the adsorption amounts of the molecular sieve for oxygen and nitrogen are different, but the diffusion speed of nitrogen through the gaps of the micropores of the molecular sieve is much faster than that of oxygen; by using the adsorption kinetic property that the adsorption speed of nitrogen by the molecular sieve is greater than that of oxygen, in the time far from the equilibrium condition, oxygen can pass through the molecular sieve layer in the adsorber, and oxygen is enriched at the outlet of the adsorber to obtain the oxygen we need.

[0003] The traditional extraction process generally sends the clean compressed air in the air storage tank into two adsorbers for nitrogen-oxygen adsorption and oxygen production by split flow, and the produced oxygen is collected in the gas storage tank. This process has a relatively large consumption of compressed air, and the purity of the extracted oxygen is about 90-93%. Content of the Utility Model

[0004] The purpose of the utility model is to provide an air adsorption separation and extraction high-purity oxygen system to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An air adsorption separation and extraction high-purity oxygen system provided by the utility model includes two groups of adsorber units. The two groups of adsorber units are respectively connected with an air inlet pipeline, a first gas collection and buffer pipeline, a second gas collection and buffer pipeline, and a third gas collection and buffer pipeline. A buffer tank unit and an exhaust unit are connected between the first gas collection and buffer pipeline, the second gas collection and buffer pipeline, and the third gas collection and buffer pipeline.

[0007] Further, the two groups of adsorber units (1) respectively include Adsorber I, Adsorber II, Adsorber III, Adsorber IV, Adsorber V, and Adsorber VI.

[0008] Further, the intake pipeline (2) includes a main intake pipeline and a shunt pipeline connected thereto. A regulating valve BV01, a regulating valve SV07, and a gas diffusing valve SV08 are provided on the main intake pipeline. A regulating valve SV01, a regulating valve SV02, a regulating valve SV03, a regulating valve SV04, a regulating valve SV05, and a regulating valve SV06 are provided on the shunt pipeline. The regulating valve SV01, the regulating valve SV02, the regulating valve SV03, the regulating valve SV04, the regulating valve SV05, and the regulating valve SV06 are respectively arranged in one-to-one correspondence with the adsorber I, the adsorber II, the adsorber III, the adsorber IV, the adsorber V, and the adsorber VI.

[0009] Further, the buffer tank unit includes a buffer tank V01, a buffer tank V02, a buffer tank V03, and a buffer tank V04. A compressor M-01 is provided at one end of the buffer tank V03. A compressor filter is provided between the buffer tank V01 and the buffer tank V04.

[0010] Further, a regulating valve BV02 and a regulating valve SV21 are provided between the buffer tank V01 and the first gas collecting and buffering pipeline. A regulating valve BV06 and a regulating valve SV22 are provided between the buffer tank V02 and the third gas collecting and buffering pipeline. A regulating valve BV04, a regulating valve SV25, and a regulating valve BV03 are provided between the buffer tank V03 and the second gas collecting and buffering pipeline. The buffer tank V01 is connected to the second gas collecting and buffering pipeline through a regulating valve SV24. A regulating valve SV23 and a regulating valve BV05 are provided between the buffer tank V01 and the buffer tank V04.

[0011] Further, the first gas collecting and buffering pipeline and the second gas collecting and buffering pipeline are respectively arranged corresponding to the buffer tank V01 and the buffer tank V03. A regulating valve SV15, a regulating valve SV16, a regulating valve SV17, a regulating valve SV18, a regulating valve SV19, and a regulating valve SV20 are provided on the first gas collecting and buffering pipeline.

[0012] Further, a regulating valve SV09, a regulating valve SV10, a regulating valve SV11, a regulating valve SV12, a regulating valve SV13, and a regulating valve SV14 are provided on the second gas collecting and buffering pipeline.

[0013] Further, a regulating valve BV07 and a regulating valve BV08 are provided between the exhaust unit and the buffer tank unit.

[0014] Beneficial effects: An air adsorption separation and extraction system for high-purity oxygen adopts a process with multiple adsorbers. The adsorption separation is divided into three periods: the early period, the middle period, and the late period. The oxygen separated and produced by the adsorbers is collected and cached, stored and purified, screened and shunted, and then adsorbed and separated again to produce oxygen with a purity of 99.5%. The adsorption separation system requires the compressed air input at the previous stage to have a working pressure within the range of 0.35 - 0.45 MPa. Brief Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the connection relationship of the system device of the present invention.

[0016] Reference Signs

[0017] 1 - Adsorber unit, 2 - Inlet gas pipeline, 3 - First gas collection and caching pipeline, 4 - Second gas collection and caching pipeline, 5 - Third gas collection and caching pipeline, 6 - Buffer tank unit, 7 - Exhaust unit, 8 - Compressor M-018. Detailed Embodiment

[0018] The following are specific embodiments of the present invention in combination with the drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0019] Embodiment

[0020] As Figure 1 shown, an air adsorption separation and extraction system for high-purity oxygen, the system includes two groups of adsorber units 1, and the two groups of adsorber units 1 are respectively connected with an inlet gas pipeline 2, a first gas collection and caching pipeline 3, a second gas collection and caching pipeline 4, and a third gas collection and caching pipeline 5. A buffer tank unit 6 and an exhaust unit 7 are connected between the first gas collection and caching pipeline 3, the second gas collection and caching pipeline 4, and the third gas collection and caching pipeline 5.

[0021] The two groups of adsorber units 1 respectively include Adsorber Ⅰ, Adsorber Ⅱ, Adsorber Ⅲ, Adsorber Ⅳ, Adsorber Ⅴ, and Adsorber Ⅵ. The inlet gas pipeline 2 includes a main inlet gas pipeline and a shunt pipeline connected thereto. A regulating valve BV01, a regulating valve SV07, and a diffusing valve SV08 are provided on the main inlet gas pipeline. Regulating valves SV01, SV02, SV03, SV04, SV05, and SV06 are provided on the shunt pipeline. The regulating valves SV01, SV02, SV03, SV04, SV05, and SV06 are respectively arranged in one-to-one correspondence with Adsorber Ⅰ, Adsorber Ⅱ, Adsorber Ⅲ, Adsorber Ⅳ, Adsorber Ⅴ, and Adsorber Ⅵ.

[0022] The buffer tank unit 6 includes buffer tanks V01, V02, V03, and V04. A compressor M-018 is provided at one end of buffer tank V03. A compressor filter is provided between buffer tanks V01 and V04. A regulating valve BV02 and a regulating valve SV21 are provided between buffer tank V01 and the first gas collection and buffer pipeline 3. A regulating valve BV06 and a regulating valve SV22 are provided between buffer tank V02 and the third gas collection and buffer pipeline 5. A regulating valve BV04, a regulating valve SV25, and a regulating valve BV03 are provided between buffer tank V03 and the second gas collection and buffer pipeline 4. Buffer tank V01 is connected to the second gas collection and buffer pipeline 4 through regulating valve SV24. A regulating valve SV23 and a regulating valve BV05 are provided between buffer tanks V01 and V04.

[0023] The first gas collection and buffer pipeline 3 and the second gas collection and buffer pipeline 4 are respectively arranged corresponding to buffer tanks V01 and V03. A regulating valve SV15, a regulating valve SV16, a regulating valve SV17, a regulating valve SV18, a regulating valve SV19, and a regulating valve SV20 are provided on the first gas collection and buffer pipeline 3. A regulating valve SV09, a regulating valve SV10, a regulating valve SV11, a regulating valve SV12, a regulating valve SV13, and a regulating valve SV14 are provided on the second gas collection and buffer pipeline 4. A regulating valve BV07 and a regulating valve BV08 are provided between the exhaust unit 7 and the buffer tank unit 6.

[0024] The preparation process flow for producing pure oxygen by air adsorption and separation is as follows:

[0025] 1. Open regulating valves BV01, SV01, SV03, and SV05. The clean compressed air enters adsorbers I, III, and V. Among them, regulating valve SV03 is opened 10 - 12 seconds later than regulating valve SV01, and regulating valve SV05 is opened 8 - 10 seconds later than regulating valve SV03.

[0026] 2. When the pressure in adsorber I rises to 0.15 MPa, open regulating valves SV09, SV11, SV13, and SV25. When the pressure in adsorber III rises to 0.15 MPa, open regulating valves SV15, SV17, SV19, and SV21. When the pressure in adsorber III rises to 0.10 MPa, open regulating valves SV02, SV04, SV06, and SV08. After regulating valves SV15, SV17, SV19, and SV21 are opened and operated for 15 - 20 seconds, then open regulating valves SV07, SV25, SV10, SV12, and SV14.

[0027] 3. After the adsorber Ⅴ is pressurized to 0.45 MPa and runs for 15 - 20 seconds, open the regulating valves BV01, SV02, SV04, and SV06. The clean compressed air enters the adsorbers Ⅱ, Ⅳ, and Ⅵ. Among them, the regulating valve SV04 is opened 10 - 12 seconds after the regulating valve SV02, and the regulating valve SV06 is opened 8 - 10 seconds after the regulating valve SV04;

[0028] 4. After the adsorber Ⅱ is pressurized to 0.15 MPa, open the regulating valves SV10, SV12, SV14, and SV25. After the adsorber Ⅳ is pressurized to 0.15 MPa, open the regulating valves SV16, SV17, SV18, and SV20. After the adsorber Ⅵ is pressurized to 0.10 MPa, open the regulating valves SV01, SV03, SV05, and SV08. After the regulating valves SV16, SV18, SV20, and SV21 are opened and run for 15 - 20 seconds, then open the regulating valves SV07, SV25, SV09, SV11, and SV13;

[0029] 5. When the pressure of the adsorber I reaches 0.45 MPa for 10 seconds and the running time is 20 - 25 seconds during adsorption, the regulating valve SV24 is opened for 5 - 10 seconds. When the pressure of the adsorber Ⅱ reaches 0.45 MPa for 10 seconds and the running time is 20 - 25 seconds during adsorption, the regulating valve SV24 is opened for 5 - 10 seconds.

[0030] 6. When the working pressure of the adsorbers I and Ⅱ is between 0.2 MPa and 0.4 MPa, run the compressor M - 01.

[0031] During the process of compressed air entering the adsorber for adsorption and separation to produce oxygen, it is necessary to keep the working pressure of the adsorber within the range of 0.35 - 0.45 MPa. The working adsorption time of the adsorber can be adjusted slightly according to the purity of the oxygen produced later. When the process gas screening and switching regulating valves SV24 and SV25 are opened, the gas flow rate in the pipeline is restricted not to exceed 20% of the rated gas volume. During system debugging, the gas purity of the buffer tank V01 can be detected, and the opening degree of the gas purity regulating valve BV05 can be referred to. When the oxygen purity of the post - stage output reaches 99.5%, a silencer is set at the post - stage of the regulating valve SV08 which is a relief valve. During the debugging process, attention needs to be paid to the flow rate of the relief gas.

[0032] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An air adsorption separation and extraction system for high-purity oxygen, characterized in that: The system includes two groups of adsorber units (1), and each of the two groups of adsorber units (1) is respectively connected with an intake pipeline (2), a first gas collection and buffer pipeline (3), a second gas collection and buffer pipeline (4), and a third gas collection and buffer pipeline (5). A buffer tank unit (6) and an exhaust unit (7) are connected between the first gas collection and buffer pipeline (3), the second gas collection and buffer pipeline (4), and the third gas collection and buffer pipeline (5). Each of the two groups of adsorber units (1) includes Adsorber I, Adsorber II, Adsorber III, Adsorber IV, Adsorber V, and Adsorber VI. The intake pipeline (2) includes a main intake pipeline and a shunt pipeline connected thereto. A regulating valve BV01, a regulating valve SV07, and a diffusing valve SV08 are provided on the main intake pipeline. Regulating valves SV01, SV02, SV03, SV04, SV05, and SV06 are provided on the shunt pipeline. The regulating valves SV01, SV02, SV03, SV04, SV05, and SV06 are respectively arranged in one-to-one correspondence with Adsorber I, Adsorber II, Adsorber III, Adsorber IV, Adsorber V, and Adsorber VI. The buffer tank unit (6) includes Buffer Tank V01, Buffer Tank V02, Buffer Tank V03, and Buffer Tank V04. A compressor M-01 (8) is provided at one end of Buffer Tank V03. A compressor filter is provided between Buffer Tank V01 and Buffer Tank V04. A regulating valve BV02 and a regulating valve SV21 are provided between Buffer Tank V01 and the first gas collection and buffer pipeline (3). A regulating valve BV06 and a regulating valve SV22 are provided between Buffer Tank V02 and the third gas collection and buffer pipeline (5). A regulating valve BV04, a regulating valve SV25, and a regulating valve BV03 are provided between Buffer Tank V03 and the second gas collection and buffer pipeline (4). Buffer Tank V01 is connected to the second gas collection and buffer pipeline (4) through a regulating valve SV24. A regulating valve SV23 and a regulating valve BV05 are provided between Buffer Tank V01 and Buffer Tank V04. The first gas collection and buffer pipeline (3) and the second gas collection and buffer pipeline (4) are respectively arranged corresponding to Buffer Tank V01 and Buffer Tank V03. Regulating valves SV15, SV16, SV17, SV18, SV19, and SV20 are provided on the first gas collection and buffer pipeline (3). Regulating valves SV09, SV10, SV11, SV12, SV13, and SV14 are provided on the second gas collection and buffer pipeline (4). A regulating valve BV07 and a regulating valve BV08 are provided between the exhaust unit (7) and the buffer tank unit (6).

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