Tail gas recovery equipment for preparing deuterated reagents

Abstract

The present disclosure relates to an exhaust gas recovery device for preparing a deuterated reagent, comprising: a separation device for removing impurities from the exhaust gas of the preparation device to obtain a target gas; a first buffer device for mixing the target gas from the separation device with multiple raw material gases from a raw material supply device to form a mixed gas; a first component detection device configured to detect the component ratios of the mixed gas; a control device configured to generate a first flow control signal based on the component ratios of the mixed gas; and a first flow control device configured to control the flow rates of the target gas and the multiple raw material gases into the first buffer device based on the first flow control signal so that the component ratios of the mixed gas meet predetermined component ratios. This exhaust gas recovery device can fully recover useful gases from the exhaust gas, reducing waste.

Description

Technical Field

[0001] The present disclosure generally relates to the field of deuterated reagent preparation, and in particular, to an exhaust gas recovery device for preparing deuterated reagents. Background Art

[0002] Deuterated reagents such as deuterated methanol and deuterated ethanol are important NMR solvents. Deuterated reagents are typically prepared from raw materials via a catalytic reaction in a reactor. Adsorption equipment is often used to absorb the deuterium from the tail gas generated during the preparation of the deuterated reagents, allowing for recycling. However, the cost of the adsorption equipment required to adsorb the deuterium in the tail gas is high. Furthermore, recycling only the deuterium can also result in the loss of other useful gases in the tail gas, resulting in waste. Summary of the Invention

[0003] The present disclosure provides an exhaust gas recovery device for preparing a deuterated reagent, which can fully recover useful gas in the exhaust gas and reduce waste.

[0004] According to one aspect of the present disclosure, a tail gas recovery device for preparing a deuterated reagent is provided. The tail gas recovery device includes: a separation device connected to the preparation device for preparing the deuterated reagent, for removing impurities from the tail gas from the preparation device to obtain a target gas; a first buffer device connected to the separation device and a raw material supply device, for mixing the target gas from the separation device and multiple raw material gases from the raw material supply device to form a mixed gas; a first component detection device connected to the first buffer device, configured to detect the component ratio of the mixed gas; a control device electrically connected to the first component detection device, configured to generate a first flow control signal according to the component ratio of the mixed gas; and a first flow control device, configured to control the flow rate of the target gas and the multiple raw material gases flowing into the first buffer device according to the first flow control signal, so that the component ratio of the mixed gas meets the predetermined component ratio.

[0005] In some embodiments, the first component detection device includes: a gas chromatography detection device configured to detect the gas chromatogram of the mixed gas; and the control device is further configured to identify the gas chromatogram of the mixed gas to determine the component ratio of the mixed gas.

[0006] In some embodiments, the separation device includes multiple branches; and the control device is also configured to determine whether one or more of the multiple branches meet predetermined conditions, and in response to determining that one or more of the multiple branches meet the predetermined conditions, close the branches that meet the predetermined conditions.

[0007] In some embodiments, the exhaust gas recovery equipment also includes: multiple adsorption units, respectively arranged in multiple branches, and the multiple adsorption units are configured to adsorb impurities in the exhaust gas; and multiple timing devices, respectively arranged corresponding to the multiple adsorption units, and the multiple timing devices are configured to determine the working hours of corresponding adsorption units in the multiple adsorption units; and the control device is also configured to determine whether the working hours of one or more adsorption units in the multiple adsorption units reach the predetermined working hours, and in response to determining that the working hours of one or more adsorption units in the multiple adsorption units reach the predetermined working hours, determine that the branch corresponding to the adsorption unit that reaches the predetermined working hours meets the predetermined conditions.

[0008] In some embodiments, the exhaust gas recovery equipment also includes: a plurality of impurity detection devices, respectively arranged at the output parts of the plurality of branches, the plurality of impurity detection devices being configured to respectively detect the impurity content in the target gas at the output parts of the plurality of branches; and the control device being further configured to determine whether the impurity content corresponding to one or more of the plurality of branches is greater than a predetermined impurity content threshold, and in response to determining that the impurity content corresponding to one or more of the plurality of branches is greater than the predetermined impurity content threshold, determining that the branch meets the predetermined conditions.

[0009] In some embodiments, the exhaust gas recovery device further includes: a pressurizing device connected to the first buffer device, the pressurizing device being used to pressurize the mixed gas from the first buffer device to a target pressure to form compressed gas.

[0010] In some embodiments, the exhaust gas recovery device further includes: a second buffer device connected to the boosting device, and the second buffer device is used for mixing the compressed gas.

[0011] In some embodiments, the control device is further configured to generate a second flow control signal according to a predetermined space velocity and a loading amount of the catalyst loaded in the preparation equipment, and the second flow control signal is used to control the output flow of the tail gas recovery equipment to the preparation equipment.

[0012] In some embodiments, the tail gas recovery device further includes: a filtering device connected to the output portion of the second buffer device, for filtering the gas output through the output portion of the second buffer device.

[0013] In some embodiments, the tail gas recovery device further includes: a preheating device, which is connected to the filtering device and the preparation device respectively, and is used to preheat the gas filtered by the filtering device so as to transport it to the preparation device.

[0014] This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the disclosure, nor is it intended to limit the scope of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of an exhaust gas recovery device for preparing a deuterated reagent according to an embodiment of the present disclosure is shown.

[0016] Figure 2 FIG2 is a partial block diagram of an exhaust gas recovery device for preparing a deuterated reagent according to an embodiment of the present disclosure.

[0017] In the various drawings, the same or corresponding reference numerals denote the same or corresponding parts. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0019] As used herein, the term "including" and its variations represent open inclusion, i.e., "including but not limited to." Unless otherwise stated, the term "or" means "and / or." The term "based on" means "based at least in part on." The terms "one example embodiment" and "an embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional embodiment." The terms "first," "second," etc. may refer to different or identical objects.

[0020] As mentioned above, in the traditional process of preparing deuterated reagents, only the deuterium gas in the exhaust gas is adsorbed for recycling. The cost of the required adsorption equipment is high and it will cause the loss of other useful gases in the exhaust gas.

[0021] In order to at least partially solve one or more of the above-mentioned problems and other potential problems, the exemplary embodiments of the present disclosure propose an exhaust gas recovery device for preparing a deuterated reagent. In the exhaust gas recovery device, impurities are removed from the exhaust gas from the preparation equipment to obtain a target gas, which includes the raw material gas remaining from the preparation of the deuterated reagent. The target gas is mixed with a plurality of raw material gases from the raw material supply device in a first buffer device. The control device generates a first flow control signal according to the component ratio of the mixed gas detected by the first component detection device. The first flow control device controls the flow rate of the target gas and the plurality of raw material gases flowing into the first buffer device according to the first flow control signal, so that the component ratio of the mixed gas meets the predetermined component ratio, so that the mixed gas is re-delivered to the preparation equipment for the deuterated reagent. The exhaust gas recovery device can fully recover the useful gas in the exhaust gas and reduce waste.

[0022] Figure 1 A schematic diagram of the structure of a tail gas recovery device 100 for preparing a deuterated reagent according to an embodiment of the present disclosure is shown. Tail gas recovery device 100 includes a separation device 102, a first buffer device 104, a first component detection device 106, a control device 108, and a first flow control device. In some embodiments, tail gas recovery device 100 further includes an impurity detection device, a pressurizing device 120, a second buffer device 122, a filter device 124, and a preheating device 126. The deuterated reagents used by tail gas recovery device 100 include, but are not limited to, deuterated methanol, deuterated ethanol, and the like.

[0023] The separation device 102 is connected to the preparation equipment 200 for preparing the deuterated reagent and is used to remove impurities from the tail gas from the preparation equipment 200 to obtain the target gas. The separation device 102 is provided with an adsorbent, for example, which can adsorb impurities in the tail gas.

[0024] The preparation equipment 200 includes, for example, a reactor 202, a steam drum 204, a gas-liquid separation device 206, and the like. After the mixed gas containing the raw material gas enters the reactor 202, it reacts to generate a reaction product containing a deuterated reagent. After the reaction product is separated into gas and liquid by the gas-liquid separation device 206, the liquid phase product is stored in a product tank, and the gas phase tail gas enters the separation device 102. Taking the preparation of deuterated methanol as an example, the tail gas output by the preparation equipment 200 contains by-products (such as deuterated methane, deuterated dimethyl ether, etc.), raw material gas remaining after the reaction (such as deuterium gas, carbon monoxide, etc.) and inert gas (such as nitrogen, argon, etc.). Deuterated methane, deuterated dimethyl ether, etc. are impurities, and the adsorbent can adsorb deuterated methane, deuterated dimethyl ether, etc. in the tail gas to obtain the target gas. The target gas includes, for example, the raw material gas remaining after the reaction and the inert gas.

[0025] Regarding the first buffer device 104, it is connected to the separation device 102 and the raw material supply equipment, and is used to mix the target gas from the separation device 102 and the multiple raw material gases from the raw material supply equipment to form a mixed gas. Taking the preparation of deuterated methanol as an example, the multiple raw material gases required include, for example, deuterium gas and carbon monoxide. The raw material supply equipment includes, for example, a deuterium gas raw material cylinder 212 for storing deuterium gas and a carbon monoxide raw material cylinder 214 for storing carbon monoxide. In some embodiments, the raw material supply equipment also includes an inert gas cylinder 216 for storing inert gas. The first buffer device 104 is, for example, a buffer tank. The pressure in the first buffer device 104 is, for example, an absolute pressure of 1 MPa (megapascal), which can facilitate the full output of the raw material gas stored in the raw material supply equipment, making the use of the raw material gas stored in the raw material supply equipment more thorough and reducing waste.

[0026] In some embodiments, the output of the first buffer device 104 is connected to the preparation equipment 200, and the mixed gas in the first buffer device 104 is transported to the preparation equipment 200 for reaction to produce a reaction product containing a deuterated reagent. In some embodiments, the control device 108 is configured to generate a second flow control signal based on a predetermined space velocity and the amount of catalyst loaded into the preparation equipment 200. The second flow control signal is used to control the output flow rate from the exhaust gas recovery device 100 to the preparation equipment 200. In some embodiments, a second flow control device is provided in the passage between the output of the first buffer device 104 and the preparation equipment 200. The second flow control device is configured to control the output flow rate of the mixed gas in the first buffer device 104 to the preparation equipment 200 based on the second flow control signal.

[0027] The first component detection device 106 is connected to the first buffer device 104 and is configured to detect the component ratios of the mixed gas. In some embodiments, the first component detection device 106 comprises, for example, a gas chromatograph configured to detect the gas chromatogram of the mixed gas. For example, in the preparation of deuterated methanol, the gas chromatogram of the mixed gas can indicate the ratio of deuterium and carbon monoxide in the mixed gas.

[0028] Regarding the control device 108, it is electrically connected to the first component detection device 106 and is configured to generate a first flow control signal according to the component ratio of the mixed gas. In some embodiments, the control device 108 is further configured to identify the gas chromatogram of the mixed gas in order to determine the component ratio of the mixed gas. For example, the control device 108 can identify the gas chromatogram of the mixed gas in order to determine the ratio of deuterium gas and the ratio of carbon monoxide in the mixed gas. The control device 108 can, for example, be a processing unit such as a PLC (programmable logic controller), an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), and a CPU (Central Processing Unit). The control device 108 can, for example, be trained to identify the gas chromatogram of the mixed gas in order to determine the component ratio of the mixed gas.

[0029] The first flow control device is configured to control the flow of the target gas and multiple raw gas streams into the first buffer device based on a first flow control signal, so that the component ratios of the mixed gas meet predetermined component ratios. The first flow control device, for example, includes a first flow control unit 112 corresponding to the target gas, a second flow control unit 114 corresponding to deuterium gas, and a third flow control unit 116 corresponding to carbon monoxide. In some embodiments, the first flow control device also includes a fourth flow control unit 118 corresponding to an inert gas. The first flow control unit 112 is disposed in the passage between the separation device 102 and the first buffer device 104; the second flow control unit 114 is disposed in the passage between the deuterium raw gas cylinder 212 and the first buffer device 104; the third flow control unit 116 is disposed in the passage between the carbon monoxide raw gas cylinder 214 and the first buffer device 104; and the fourth flow control unit 118 is disposed in the passage between the inert gas cylinder 216 and the first buffer device 104.

[0030] The first flow control signal generated by the control device 108 can control the first flow control unit 112, the second flow control unit 114, the third flow control unit 116, and the fourth flow control unit 118, respectively, to control the flow rate of the target gas flowing into the first buffer device 104, the flow rate of the deuterium gas flowing into the first buffer device 104, the flow rate of the carbon monoxide flowing into the first buffer device 104, and the flow rate of the inert gas flowing into the first buffer device 104. In other words, the first flow control signal generated by the control device 108 can control the flow rate of each raw material gas flowing into the first buffer device, as well as the flow rate of the target gas flowing into the first buffer device.

[0031] It should be noted that, taking the preparation of deuterated methanol as an example, the optimal ratio of deuterium to carbon monoxide in the mixed gas used for the reaction is, for example, 2:1. When the ratio of the proportion of deuterium to carbon monoxide in the mixed gas does not meet the optimal ratio, the control device 108 generates a first flow control signal. The first flow control device controls the flow rate of the target gas and the multiple raw material gases into the first buffer device 104 based on the first flow control signal to ensure that the ratio of the proportion of deuterium to carbon monoxide in the mixed gas meets the optimal ratio, thereby ensuring that the component ratios of the mixed gas meet the predetermined component ratios. For example, when the ratio of the proportion of deuterium gas to the proportion of carbon monoxide in the mixed gas is greater than the optimal ratio, the control device 108 generates a first flow control signal to reduce the flow of deuterium gas flowing into the first buffer device 104 or increase the flow of carbon monoxide flowing into the first buffer device 104, so that the component ratio of the mixed gas meets the predetermined component ratio; when the ratio of the proportion of deuterium gas to the proportion of carbon monoxide in the mixed gas is less than the optimal ratio, the control device 108 generates a first flow control signal to increase the flow of deuterium gas flowing into the first buffer device 104 or reduce the flow of carbon monoxide flowing into the first buffer device 104, so that the component ratio of the mixed gas meets the predetermined component ratio.

[0032] In this solution, a separation device 102 removes impurities from the tail gas from the preparation equipment 200 to produce a target gas. The target gas includes residual raw material gas from the deuterated reagent preparation. The target gas is mixed with multiple raw material gases from the raw material supply equipment in a first buffer device 104. A control device 108 generates a first flow control signal based on the component ratios of the mixed gas detected by the first component detection device 106. The first flow control device controls the flow rate of the target gas and the multiple raw material gases into the first buffer device based on the first flow control signal, ensuring that the component ratios of the mixed gas meet the predetermined component ratios, allowing the mixed gas to be re-delivered to the preparation equipment for deuterated reagent preparation. The tail gas recovery device 100 can fully recover useful gases from the tail gas, reducing waste. Furthermore, the component ratios of the mixed gas output by the tail gas recovery device 100 meet the predetermined component ratios, ensuring that the ratios of the raw material gases in the mixed gas meet the optimal ratios for deuterated reagent preparation, thereby improving the efficiency of deuterated reagent preparation.

[0033] The booster 120 is connected to the first buffer 104 and is used to boost the mixed gas from the first buffer 104 to a target pressure to form compressed gas. The target pressure is, for example, any value between 5 and 6 MPa. The booster 120 includes, for example, a compressor 128.

[0034] The second buffer device 122 is connected to the boosting device 120 and is used for mixing the compressed gas.

[0035] The filter device 124 is connected to the output portion of the second buffer device 122 and is used to filter the gas outputted from the output portion of the second buffer device 122. It should be understood that the gas outputted from the output portion of the second buffer device 122 is compressed gas that has been thoroughly mixed within the second buffer device 122. The filter device 124 can remove particulate matter from the gas outputted from the output portion of the second buffer device 122.

[0036] The preheating device 126 is connected to the filter device 124 and the preparation device 200, respectively, and is used to preheat the gas filtered by the filter device 124 for delivery to the preparation device 200. It should be understood that the gas filtered by the filter device 124 is delivered to the preparation device 200 for reaction. Preheating the gas filtered by the filter device 124 can improve the reaction efficiency of the gas in the preparation device 200, thereby improving the efficiency of preparing the deuterated reagent.

[0037] Figure 2 A partial block diagram of an exhaust gas recovery device 300 for preparing a deuterated reagent according to an embodiment of the present disclosure is shown. In the exhaust gas recovery device 300, the separation device 102 includes multiple branches; the control device 108 is further configured to determine whether one or more of the multiple branches meet predetermined conditions, and in response to determining that one or more of the multiple branches meet the predetermined conditions, close the branch that meets the predetermined conditions.

[0038] The multiple branches include at least a first branch 322 and a second branch 324. A first valve 326 corresponds to the first branch 322, and a second valve 328 corresponds to the second branch 324. The control device 108 controls the first valve 326 to open, allowing the exhaust gas from the preparation equipment 200 to flow through the first branch 322. The control device 108 controls the first valve 326 to close, preventing the exhaust gas from the preparation equipment 200 from flowing through the first branch 322. The control device 108 controls the second valve 328 to open, allowing the exhaust gas from the preparation equipment 200 to flow through the second branch 324. The control device 108 controls the second valve 328 to close, preventing the exhaust gas from the preparation equipment 200 from flowing through the second branch 324.

[0039] In some embodiments, the exhaust gas recovery equipment 300 also includes: multiple impurity detection devices, respectively arranged at the output parts of multiple branches, and the multiple impurity detection devices are configured to respectively detect the impurity content in the target gas of the output parts of the multiple branches; the control device 108 is also configured to determine whether the impurity content corresponding to one or more branches among the multiple branches is greater than a predetermined impurity content threshold, and in response to determining that the impurity content corresponding to one or more branches among the multiple branches is greater than the predetermined impurity content threshold, determine that the branch meets the predetermined conditions.

[0040] The multiple impurity detection devices include, for example, a first impurity detection device 332 and a second impurity detection device 334. The first impurity detection device 332 is disposed at the output of the first branch 322 and is used to detect the impurity content of the target gas at the output of the first branch 322. The second impurity detection device 334 is disposed at the output of the second branch 324 and is used to detect the impurity content of the target gas at the output of the second branch 324. Taking the preparation of deuterated methanol as an example, the impurity content includes the deuterated methane content and the deuterated dimethyl ether content. If at least one of the deuterated methane content and the deuterated dimethyl ether content is greater than the corresponding predetermined impurity content threshold, the control device 108 determines that the corresponding branch meets the predetermined condition and controls the corresponding valve to close, so that the exhaust gas from the preparation equipment 200 cannot flow through the branch. It should be noted that when the impurity content corresponding to a branch is greater than the predetermined impurity content threshold, it indicates that the adsorbent in the branch is saturated. At this time, the control device 108 closes the branch to facilitate replacement of the adsorbent in the branch.

[0041] In some embodiments, the control device 108 controls one of the multiple branches to open. When the impurity content corresponding to the branch is greater than a predetermined impurity content threshold, the control device 108 determines that the branch meets the predetermined conditions and closes the branch; then the control device 108 controls at least one other branch of the multiple branches to open, thereby realizing automatic switching of the branches.

[0042] The exhaust gas recovery equipment 300 also includes multiple adsorption units and multiple timing devices. The multiple adsorption units are respectively arranged in multiple branches, and the multiple adsorption units are configured to adsorb impurities in the exhaust gas; the multiple timing devices are respectively arranged corresponding to the multiple adsorption units, and the multiple timing devices are configured to determine the operating time of corresponding adsorption units in the multiple adsorption units; the control device 108 is further configured to determine whether the operating time of one or more of the multiple adsorption units has reached a predetermined operating time, and in response to determining that the operating time of one or more of the multiple adsorption units has reached the predetermined operating time, determine that the branch corresponding to the adsorption unit that has reached the predetermined operating time meets a predetermined condition. The multiple adsorption units include at least a first adsorption unit 342 and a second adsorption unit 344. The first adsorption unit 342 is arranged in the first branch 322, and the second adsorption unit 344 is arranged in the second branch 324.

[0043] It should be noted that the operating time of an adsorption unit refers to the total time that the adsorption unit performs the adsorption operation after being updated to the corresponding branch. In other words, the timing device restarts from the initial value (e.g., zero) after the adsorption unit is updated to the corresponding branch. Furthermore, the timing device starts counting when the corresponding adsorption unit performs the adsorption operation and pauses counting when the corresponding adsorption unit is not performing the adsorption operation.

[0044] The predetermined working time is the working time that the adsorption unit can withstand until it reaches adsorption saturation. The predetermined working time can be determined, for example, based on the output of the preparation equipment 200 and the adsorption efficiency of the adsorption unit. It should be understood that the output of the preparation equipment 200 is positively correlated with the amount of exhaust gas generated. Therefore, the predetermined working time is negatively correlated with the output of the preparation equipment 200. The predetermined working time is negatively correlated with the adsorption efficiency of the adsorption unit. The predetermined working time can be determined based on the output of the preparation equipment 200 and the adsorption efficiency of the adsorption unit. When the timing of the timing device reaches the predetermined working time, it means that the corresponding adsorption unit has reached the adsorption saturation state. At this time, the control device 108 closes the branch, which can facilitate the replacement of the adsorption unit in the branch.

[0045] In some embodiments, the control device 108 controls one of the multiple branches to open. When the working time of the adsorption unit in the branch reaches a predetermined working time, the control device 108 determines that the branch meets the predetermined conditions and closes the branch; then the control device 108 controls at least one other branch among the multiple branches to open, thereby realizing automatic switching of the branches.

[0046] While various embodiments of the present disclosure have been described above, the foregoing description is intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand the embodiments disclosed herein.

[0047] The above are merely optional embodiments of the present disclosure and are not intended to limit the present disclosure. Those skilled in the art will readily appreciate that the present disclosure may be modified and varied in various ways. Any modifications, equivalent replacements, improvements, and the like made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A tail gas recovery device for preparing deuterated reagents, characterized in that: include: A separation device connected to a preparation device for preparing a deuterated reagent, and used to remove impurities from the tail gas from the preparation device to obtain a target gas; a first buffer device connected to the separation device and the raw material supply device, for mixing the target gas from the separation device and the multiple raw material gases from the raw material supply device to form a mixed gas; a first component detection device, connected to the first buffer device, configured to detect the component ratio of the mixed gas; a control device electrically connected to the first component detection device and configured to generate a first flow control signal according to the component ratio of the mixed gas; as well as The first flow control device is configured to control the flow of the target gas and the multiple raw material gases into the first buffer device according to the first flow control signal, so that the component ratio of the mixed gas meets the predetermined component ratio.

2. The tail gas recovery equipment according to claim 1, characterized in that: The first component detection device includes: a gas chromatography detection device, the gas chromatography detection device being configured to detect the gas chromatography of the mixed gas; and The control device is further configured to identify a gas chromatogram of the mixed gas so as to determine a component ratio of the mixed gas.

3. The tail gas recovery equipment according to claim 1, characterized in that: The separation device includes a plurality of branches; and The control device is further configured to determine whether one or more branches among the plurality of branches meet a predetermined condition, and in response to determining that one or more branches among the plurality of branches meet the predetermined condition, close the branch meeting the predetermined condition.

4. The tail gas recovery equipment according to claim 3, characterized in that: Also includes: A plurality of adsorption units are respectively arranged in the plurality of branches, and the plurality of adsorption units are configured to adsorb impurities in the exhaust gas; as well as a plurality of timing devices, each corresponding to each of the plurality of adsorption units, wherein the plurality of timing devices are configured to determine the working time of a corresponding adsorption unit among the plurality of adsorption units; as well as The control device is also configured to determine whether the operating time of one or more adsorption units among the multiple adsorption units reaches a predetermined operating time, and in response to determining that the operating time of one or more adsorption units among the multiple adsorption units reaches the predetermined operating time, determine that the branch corresponding to the adsorption unit that reaches the predetermined operating time meets the predetermined condition.

5. The tail gas recovery equipment according to claim 3, characterized in that: Also includes: a plurality of impurity detection devices, respectively disposed at the output portions of the plurality of branches, the plurality of impurity detection devices being configured to respectively detect the impurity content in the target gas at the output portions of the plurality of branches; as well as The control device is also configured to determine whether the impurity content corresponding to one or more branches among the multiple branches is greater than a predetermined impurity content threshold, and in response to determining that the impurity content corresponding to one or more branches among the multiple branches is greater than the predetermined impurity content threshold, determine that the branch meets the predetermined condition.

6. The tail gas recovery equipment according to claim 1, characterized in that: Also includes: The boosting device is connected to the first buffer device, and is used to boost the mixed gas from the first buffer device to a target pressure to form compressed gas.

7. The tail gas recovery equipment according to claim 6, characterized in that: Also includes: The second buffer device is connected to the boosting device and is used for mixing the compressed gas.

8. The tail gas recovery equipment according to claim 1, characterized in that: The control device is further configured to generate a second flow control signal according to a predetermined space velocity and a loading amount of the catalyst loaded in the preparation equipment, and the second flow control signal is used to control the output flow of the tail gas recovery equipment to the preparation equipment.

9. The tail gas recovery equipment according to claim 7, characterized in that: Also includes: The filter device is connected to the output portion of the second buffer device and is used for filtering the gas output through the output portion of the second buffer device.

10. The tail gas recovery equipment according to claim 9, characterized in that: Also includes: The preheating device is connected to the filtering device and the preparation equipment respectively, and is used to preheat the gas filtered by the filtering device so as to transport it to the preparation equipment.

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