阅读说明：本技术 一种配制含空气的不同浓度二氧化碳气体的装置与方法 (Device and method for preparing carbon dioxide gas containing air and having different concentrations ) 是由 刘立熙 朱亮亮 邓晓彬 陈曦 于 2019-09-24 设计创作，主要内容包括：本发明提供一种配制含空气的不同浓度CO<Sub>2</Sub>气体的装置与方法,属于混合气体的配气领域；所述装置包括高纯CO<Sub>2</Sub>气瓶、高压反应釜、空压机、真空泵、CO<Sub>2</Sub>气体减压阀、高精度数显压力表和气体管路；配气时先根据所要配制的混合气的浓度和压力计算空气和CO<Sub>2</Sub>的分压,然后利用空压机或真空泵调整好空气用量,最后将CO<Sub>2</Sub>经减压阀减压后通入高压反应釜中,至预设压力后静置片刻即可完成配气；采用本发明所述的装置及方法配制CO<Sub>2</Sub>气体,不仅成本低廉,操作简便省时,而且气体浓度可任意调节,配气精度高,是一种适合大规模推广应用的混合气配制装置与方法。(The invention provides a method for preparing CO containing air with different concentrations 2 A gas device and a method belong to the field of gas distribution of mixed gas; the apparatus comprises high purity CO 2 Gas cylinder, high-pressure reaction kettle, air compressor, vacuum pump and CO 2 A gas pressure reducing valve, a high-precision digital display pressure gauge and a gas pipeline; when distributing air, the air and CO are calculated according to the concentration and pressure of the mixed gas to be prepared 2 The air consumption is adjusted by an air compressor or a vacuum pump, and finally CO is added 2 Reducing the pressure by a pressure reducing valve, introducing the mixture into a high-pressure reaction kettle, standing the mixture for a moment after the preset pressure is reached, and completing gas distribution; the device and the method of the invention are adopted to prepare CO 2 The gas has low cost, simple and time-saving operation, adjustable gas concentration and high gas distribution precision,is a mixed gas preparation device and a method suitable for large-scale popularization and application.)

1. An apparatus for preparing carbon dioxide gas containing air with different concentrations is characterized in that: comprising high purity CO₂Gas cylinder (1), high pressure batch autoclave (4), air compressor (9), vacuum pump (10), CO₂The gas pressure reducing valve (2), the high-precision digital display pressure gauge (6) and a gas pipeline for connecting all the parts;

the connection relationship is as follows: high purity CO₂The gas outlet of the gas cylinder (1) is directly connected with CO₂The inlet end of the gas pressure reducing valve (2) is connected with CO₂The gas outlet end of the gas pressure reducing valve (2) is connected with a first gas inlet valve (3) of a high-pressure reaction kettle (4) through a pipeline to form feed gas CO₂The air intake device of (1); the air compressor (9) is connected with a second air inlet valve (7) of the high-pressure reaction kettle (4) through a pipeline to form an air inlet device; the vacuum pump (10) is connected with a third air inlet valve (8) of the high-pressure reaction kettle (4) through a pipeline to form an air extracting device; the reaction kettle is provided with a high-precision digital display pressure gauge (6) for detecting the air pressure in the high-pressure reaction kettle.

2. The apparatus for dispensing carbon dioxide gas containing air at different concentrations as set forth in claim 1, wherein: the CO is₂The input range of the gas reducing valve (2) is 0-25MPa, and the output range is 0-1 MPa.

3. The apparatus for dispensing carbon dioxide gas containing air at different concentrations as set forth in claim 1, wherein: the vacuum pump (10) is a rotary vane vacuum pump and can pump vacuum to-0.9 bar.

4. The apparatus for dispensing carbon dioxide gas containing air at different concentrations as set forth in claim 1, wherein: the air compressor (9) is an oil-free silent air compressor, the air storage capacity is 35L, and the air displacement is 150L/min.

5. The apparatus for dispensing carbon dioxide gas containing air at different concentrations as set forth in claim 1, wherein: the high-pressure reaction kettle (4) is made of 316L stainless steel and can bear 2MPa pressure.

6. The apparatus for dispensing carbon dioxide gas containing air at different concentrations as set forth in claim 1, wherein: the measuring range of the high-precision digital display pressure gauge (6) is-0.1-10 MPa, and the precision grade is 0.4 grade.

7. A method of dispensing carbon dioxide gas containing air at different concentrations using the apparatus of any one of claims 1 to 6, wherein: the method comprises the following steps:

(1) determination of CO required for the reaction₂M percent in massAnd the pressure P in the high-pressure reaction kettle (4) is calculated as the partial pressure P of the air according to the Dalton partial pressure law in bar_A＝(100-m)％*(P+1)；

(2) If the air partial pressure P_AIf the pressure is more than 1bar, a second air inlet valve (7) is opened, compressed air is injected into the high-pressure reaction kettle (4) by an air compressor (9), and the reading of a high-precision digital display pressure gauge (6) is (P)_A-1) bar, after which a 30 second rest ensures that the reading is stable at (P)_A-1) bar; if the air partial pressure P_AOpening a third air inlet valve (8) when the pressure does not exceed 1bar, pumping out partial air in the high-pressure reaction kettle (4) by using a vacuum pump (10), and reading to a high-precision digital display pressure gauge (6) as (1-P)_A) bar, standing for 30 seconds to ensure the reading is stable (P)_A-1)bar；

(3) Opening the first air inlet valve (3) to introduce high purity CO₂High purity CO in a gas cylinder (1)₂By CO₂And (3) introducing the gas pressure reducing valve (2) into the high-pressure reaction kettle (4) after pressure reduction, keeping the reading of the high-precision digital display pressure gauge (6) at P, and standing for 30 seconds to ensure that the reading is stabilized at P.

Technical Field

The invention belongs to the field of gas distribution of mixed gas, and particularly relates to a device and a method for preparing carbon dioxide gas containing air and having different concentrations.

Background

As is well known, CO₂Is an important greenhouse gas causing greenhouse effect and can stay in the atmosphere for a long time. Global CO since the middle of the 18 th century of industrial revolution₂Emissions increase significantly, estimated to have increased by over 45%. In 2017, the global atmospheric concentration is 405.0 +/-0.1 ppm, and a new height on the global observation history is created. The solution to global warming and greenhouse effect is not slow enough. At present, one of the mainstream approaches to the treatment is to treat CO discharged in production and living₂Capture, Utilization and Storage (CCUS for short). However, none of the various capture technologies is capable of directly obtaining high purity CO₂For impure CO₂Purification can add significant cost to the capture, and therefore requires different concentrations of CO₂The use of gases is widely studied. However, low concentration CO is purchased directly from gas plants₂The obtained mixed gas is usually formed by mixing nitrogen, oxygen and carbon dioxide, and has high price and unsatisfactory gas concentration and components.

Disclosure of Invention

In view of the above, the present invention aims to provide a device and a method for preparing carbon dioxide gas containing air with different concentrations, the device and the method for preparing mixed gas have the advantages of low cost, simple and time-saving operation, adjustable gas concentration, high gas distribution precision, and capability of preparing CO containing air₂The optimal scheme of the mixed gas is worthy of large-scale popularization and application.

In order to solve the technical problems, the invention adopts the following technical scheme:

a device for preparing carbon dioxide gas containing air with different concentrations comprises high purity CO₂Gas cylinder 1, high-pressure reaction kettle 4, air compressor 9, vacuum pump 10 and CO₂The gas pressure reducing valve 2, the high-precision digital display pressure gauge 6 and a gas pipeline connecting all the parts are arranged;

the connection relationship is as follows: high purity CO₂Outlet of gas cylinder 1Directly orally with CO₂Inlet end connection of gas pressure reducing valve 2, CO₂The gas outlet end of the gas pressure reducing valve 2 is connected with a first gas inlet valve 3 of a high-pressure reaction kettle 4 through a pipeline to form feed gas CO₂The air intake device of (1); the air compressor 9 is connected with the second air inlet valve 7 of the high-pressure reaction kettle 4 through a pipeline to form an air inlet device; the vacuum pump 10 is connected with a third air inlet valve 8 of the high-pressure reaction kettle 4 through a pipeline to form an air extracting device; the reaction kettle is provided with a high-precision digital display pressure gauge 6 for detecting the air pressure in the high-pressure reaction kettle.

CO according to the invention₂The input range of the gas pressure reducing valve 2 is 0-25MPa, and the output range is 0-1 MPa.

The vacuum pump 10 is a rotary vane vacuum pump and can be pumped to-0.9 bar.

The air compressor 9 is an oil-free mute air compressor, the air storage capacity is 35L, and the air displacement is 150L/min.

The high-pressure reaction kettle 4 is made of 316L stainless steel and can bear 2MPa pressure.

The measuring range of the high-precision digital display pressure gauge 6 is-0.1-10 MPa, and the precision grade is 0.4 grade.

A method for preparing carbon dioxide gas containing air with different concentrations utilizes the device and adopts the following steps:

(1) determination of CO required for the reaction₂M% and a pressure P (bar), calculating the partial pressure of air P according to the Dalton partial pressure law_A＝(100-m)％*(P+1)；

(2) If the air partial pressure P_AIf the pressure is more than 1bar, the second air inlet valve 7 is opened, compressed air is injected into the high-pressure reaction kettle 4 by an air compressor 9, and the reading of the high-precision digital display pressure gauge 6 is (P)_A-1) bar, after which a 30 second rest ensures that the reading is stable at (P)_A-1) bar; if the air partial pressure P_AOpening a third air inlet valve 8 when the pressure does not exceed 1bar, pumping out partial air in the high-pressure reaction kettle 4 by using a vacuum pump 10, and reading the high-precision digital display pressure gauge 6 as (1-P)_A) bar, standing for 30 seconds to ensure the reading is stable (P)_A-1)bar；

(3) Opening the first intake valve 3 willHigh purity CO₂High purity CO in gas cylinder 1₂By CO₂And (3) introducing the gas pressure reducing valve 2 into the high-pressure reaction kettle 4 after pressure reduction, keeping the high-precision digital display pressure gauge 6 at a reading P, and keeping the high-precision digital display pressure gauge for 30 seconds to ensure that the reading is stabilized at the reading P.

Compared with the prior art, the invention has the following advantages:

(1) only needing to purchase bottled high-purity CO₂As the raw material gas, air can be directly obtained from the atmosphere by using an air compressor, so the cost is greatly reduced compared with purchasing bottled mixed gas, and the gas components are more consistent with the gas obtained by a trapping technology;

(2) the gas distribution method is very simple and convenient, can be finished by only controlling a small amount of valves to regulate the gas pressure, has short time consumption and can be prepared within two to three minutes;

(3) compared with purchased bottled mixed gas (each bottle of gas has only one concentration), the invention only needs one bottle of high-purity CO₂Can be used as raw material gas to prepare mixed gas with any concentration in the range of 0-99 percent, and the concentration precision is higher than that of bottled mixed gas.

In summary, the present invention is a known method of formulating CO containing air in terms of cost, ease of operation, and gas concentration range and accuracy₂The best scheme of the mixed gas.

Drawings

FIG. 1 is a schematic view of an apparatus for dispensing carbon dioxide gas containing air at various concentrations.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.