Search

CN-122028968-A - Device for reducing the proportion of a predetermined gas in a gas mixture to be treated

CN122028968ACN 122028968 ACN122028968 ACN 122028968ACN-122028968-A

Abstract

The invention relates to a device (10) for reducing the proportion of a predetermined gas in a gas mixture to be treated, in particular for reducing the proportion of CO 2 in air intended for the production of compressed air, comprising an inlet line (12) for the gas mixture to be treated, wherein the inlet line (12) branches in a first branching region (14) to form a main line (16) and a branching line (18), and the main line (16) and the branching line (18) merge in a second branching region (20) to form an outlet line (22) for the treated gas mixture, and a gas treatment device (24) which is assigned to the branching line (18) and is designed to at least partially separate the predetermined gas from the gas mixture. According to the invention, the apparatus (10) further comprises an adjustable orifice unit (34) assigned to the main line (16) and configured to adjust the effective flow cross section of the main line (16), and at least one sensor unit (26 a, 26 b) configured to determine a ratio of a gas mixture for treatment or a predetermined gas in the treated gas mixture and to output corresponding sensor data. The invention also relates to a system formed by such an apparatus (10) and a compressor unit (100), and to a method for operating such an apparatus (10).

Inventors

  • Johannes Farkas
  • Franziska Gamboni
  • robert kempfer

Assignees

  • 宝华压缩机有限公司

Dates

Publication Date
20260512
Application Date
20240920
Priority Date
20230925

Claims (15)

  1. 1. An apparatus (10) for reducing the proportion of a predetermined gas in a gas mixture to be treated, in particular for reducing the proportion of CO 2 in air intended for the production of compressed air, the apparatus comprising: An inlet line (12) for the gas mixture to be treated, Wherein in a first branching region (14) the inlet line (12) branches into a main line (16) and a branch line (18), and in a second branching region (20) the main line (16) and the branch line (18) merge into an outlet line (22) for the treated gas mixture, and -A gas treatment device (24) associated with the branch line (18), the gas treatment device (24) being configured to at least partially separate the predetermined gas from the gas mixture; Characterized in that the device further comprises: -an adjustable orifice unit (34) associated with the main line (16), the orifice unit (34) being configured to adjust an effective flow cross section of the main line (16), and -At least one sensor unit (26 a, 26 b) configured to determine a proportion of the predetermined gas in the gas mixture to be treated or the treated gas mixture and to output corresponding sensor data.
  2. 2. The device (10) according to claim 1, Wherein the orifice unit (34) is associated with an actuator (38), the actuator (38) being operable for adjustment of the orifice unit (34).
  3. 3. The device (10) according to claim 1 or 2, It further comprises a control unit (28), said control unit (28) being operatively coupled to said at least one sensor unit (26 a, 26 b) and configured to drive said actuator (38) of said orifice unit (34) to adjust the flow cross section of said main line (16) based on the detected proportion of said gas mixture to be treated and/or said predetermined gas in said treated gas mixture.
  4. 4. The device (10) according to any one of the preceding claims, It further comprises a display unit (28 a), the display unit (28 a) being configured to output the ratio of the gas mixture to be treated and/or the predetermined gas in the treated gas mixture determined by the at least one sensor unit (26 a, 26 b).
  5. 5. The device (10) according to any one of the preceding claims, Comprising at least two sensor units (26 a, 26 b), wherein at least one sensor unit is arranged upstream of the gas treatment device (24) and at least one sensor unit is arranged downstream of the gas treatment device (24).
  6. 6. The device (10) according to any one of the preceding claims, Wherein the orifice unit (34) is configured such that it is adjustable, preferably continuously adjustable, between a minimum open state and a maximum open state, wherein in the minimum open state the minimum effective flow cross section of the main line (16) remains greater than zero.
  7. 7. The device (10) according to claim 6, Wherein the minimum open state of the orifice unit (34) corresponds to a state of the apparatus (10) in which between 30% and 50%, preferably about 40%, of the gas mixture flows through the main line (16), and/or The maximum open state of the orifice unit (34) corresponds to a state of the device (10) in which between 90% and 95%, preferably about 92%, of the gas mixture flows through the main line (16).
  8. 8. The device (10) according to any one of the preceding claims, Wherein the gas treatment device (24) comprises a container (24 a), which container (24 a) is in particular filled with soda lime and arranged to be passed by the gas mixture flowing through the branch line (18), which container (24 a) is associated with the branch line (18), preferably replaceable in its entirety.
  9. 9. The device (10) according to any one of the preceding claims, It further comprises at least one humidity sensor (32 a), said at least one humidity sensor (32 a) being configured to determine the moisture content of the gas mixture and preferably being arranged upstream of the gas treatment device (24).
  10. 10. The device (10) according to any one of the preceding claims, It further comprises a humidifying device (32 b) arranged upstream of the gas treatment apparatus (24), the humidifying device (32 b) being configured to humidify the gas mixture to be treated, preferably in a controlled manner based on data provided by the at least one humidity sensor (32 a).
  11. 11. The device (10) according to any one of the preceding claims, It further comprises a storage unit (28 b) and/or a communication unit (28 c), said storage unit (28 b) and/or communication unit (28 c) being configured to store data output by said at least one sensor unit (26 a, 26 b) and to transmit them to an external storage device, respectively.
  12. 12. The device (10) according to any one of the preceding claims, It further comprises a safety device (28), the safety device (28) being configured to initiate at least one predetermined measure if it is detected by the at least one sensor unit (26 a, 26 b) that the allowable proportion of the predetermined gas in the gas mixture to be treated and/or the treated gas mixture is exceeded.
  13. 13. A system for producing compressed air with a controlled or regulated CO 2 content, comprising a compressor unit (100) and a device (10) according to any one of the preceding claims connected upstream of the compressor unit (100).
  14. 14. A method for operating the device (10) according to any one of claims 1 to 12, comprising the steps of: -inputting a gas mixture to be treated at the inlet line (12); Continuously determining the proportion of the predetermined gas in the gas mixture to be treated and/or in the treated gas mixture, and -Adjusting the effective flow section of the main line (16) by means of the orifice unit (34) based on the determined proportion of the gas mixture to be treated and/or the predetermined gas in the treated gas mixture.
  15. 15. The method according to claim 14, Wherein the gas mixture is air and the predetermined gas is CO 2 , and the orifice unit is adjusted such that the proportion of CO 2 in the treated air is less than 1,000ppm or less than 500ppm.

Description

Device for reducing the proportion of a predetermined gas in a gas mixture to be treated Technical Field The invention relates to a device for reducing the proportion of a predetermined gas in a gas mixture to be treated, in particular for reducing the proportion of CO 2 in air intended for the production of compressed air, comprising an inlet line for the gas mixture to be treated, wherein in a first branching region the inlet line branches into a main line and a branch line in the flow direction of the gas mixture and in a second branching region the main line and the branch line merge into an outlet line for the treated gas mixture, and a gas treatment device associated with the branch line, which is configured to at least partially separate the predetermined gas from the gas mixture. Furthermore, the invention relates to a system for producing compressed air with a controlled or regulated CO 2 content comprising such a device, and to a method for operating such a device. Background While the following will focus in particular on the above-described examples of reducing the proportion of CO 2 in the breathing air in connection with the generation of compressed air, it should also be understood that the apparatus according to the invention may in principle also be suitable for reducing the proportion of other predetermined gases in various types of gas mixtures to be treated. Regarding the production and filling of compressed air and especially breathing air for various applications, it is known that the air to be filled must not exceed a predetermined content of CO 2, wherein in europe, for example, the corresponding limit value is set to 500ppm (DIN EN 12021 and north-ca standard STAAG 1458) and is set to 1,000ppm in the united states (us standard NFPA 1989 or CGA-G7.1). However, depending on the local conditions and possibly also weather conditions, it may happen that these values are exceeded in the ambient air, so that in the sense of a reduced proportion of CO 2, the ambient air must first be treated before it can be filled as compressed air for the corresponding application. In order to ensure that the above-mentioned limit value is not exceeded in such treated air, it is known, for example, from DE10047137B4 to pass air intended for the production of compressed air through a gas treatment device in which CO 2 is chemically bound and thus separated from the air. Here, in particular, so-called "soda lime" is used, which consists of a mixture of calcium hydroxide and sodium hydroxide, and when used correctly, substantially all of the CO 2 can be separated from the air stream passing through it. However, this soda lime is consumed over time and must therefore be replaced once the CO 2 therein has reached saturation after the corresponding service life. For this purpose, use is generally made of replaceable filter cartridges which contain soda lime and which can be inserted into corresponding lines of the apparatus so that the gas flow to be treated can flow through. Here, in the aforementioned DE10047137B4, the air flow to be treated is distributed according to its volume, two thirds of which are treated by the soda lime, while one third of the total air volume remains untreated. The untreated and treated portions of the gas mixture are then combined and mixed such that, assuming complete separation of CO 2 in the gas treatment plant, the concentration of CO 2 is reduced to one third after passing through the corresponding equipment. In other devices also known in the art, alternative fixed selected ratios between the treated air stream and the untreated air stream have been used, but these ratios are always determined based on its required operating parameters and geometrical characteristics before commissioning of the corresponding device. Here, the permissible service life of the gas treatment devices used is generally already established in tests and is achieved in the production operation of the plant on the basis of various safety factors. The chemicals used for treating the gas mixture, i.e. in particular the abovementioned soda lime, are therefore replaced regularly on the basis of the service life table. However, it has been found here that such a plant is inefficient in that, due to a predetermined safety margin, a higher proportion of the gas mixture to be treated than is required is generally passed through the gas treatment device in order to always ensure that the predetermined limit value for the predetermined gas in the treated gas mixture is never exceeded. Thus, the possible service life of the gas treatment device is limited before the chemicals used have to be replaced, which is expected to lead to increased downtime and increased costs of the equipment. Furthermore, additional safety margin must be provided with respect to the possible saturation of the corresponding chemicals used, so that also for this reason, their replacement will usually be carried out in a state in which the