Device for purifying hydrogen from refinery gas

Abstract

The utility model discloses a device for purifying hydrogen from refinery gas. The device at least comprises at least one first input pipeline and at least one second input pipeline, the at least one first separation unit is connected with the first input pipeline; the at least one continuous catalytic reforming hydrogen-pressure swing adsorption unit is arranged on one side, far away from the first input pipeline, of the first separation unit; at least one second input pipeline; the at least one second separation unit is connected with the second input pipeline; the at least one low-pressure separation gas-pressure swing adsorption unit is arranged on one side, far away from the second input pipeline, of the second separation unit; the connecting pipeline is connected with one first input pipeline and one second input pipeline; and the transmission pipeline is arranged between the adjacent units. According to the device for purifying the hydrogen from the refinery gas, provided by the utility model, the start-up debugging progress of the low-pressure separation gas-pressure swing adsorption unit can be accelerated, and the production progress is accelerated.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical industry, in particular to a device for purifying hydrogen from refinery gas. Background Art

[0002] The Continuous Catalytic Reforming-Pressure Swing Adsorption (CCR-PSA) unit and the Refinery offgas (ROG-PSA) unit are used as purification devices to purify the hydrogen in the tail gas of the refinery and supply it to the public utilities in the refinery or as a production raw material. However, in the early stage of the start-up of the refining unit, the raw material flow rate of the ROG-PSA unit was lower than the minimum raw material amount for the operation of the unit, resulting in the continuous addition of raw materials to the flare unit of the ROG-PSA unit. The ROG-PSA unit could not be debugged and put into use as soon as possible, and the hydrogen pipeline pressure was insufficient, which in turn affected the start-up progress of other hydrogen-using units. Moreover, the actual output of the CCR-PSA unit far exceeded the designed output, resulting in the overload operation of the CCR-PSA unit. Therefore, the CCR-RSA unit has the problem of operation fluctuations caused by overload. Utility Model Content

[0003] The purpose of the utility model is to provide a device for purifying hydrogen from refinery gas, which can speed up the start-up and commissioning progress of the low-fraction gas-pressure swing adsorption unit, speed up the production progress, avoid the waste of refinery gas, and maintain the stable operation of the continuous catalytic reforming hydrogen-pressure swing adsorption unit.

[0004] In order to achieve the above-mentioned purpose and other related purposes, the utility model is implemented through the following technical solutions.

[0005] The utility model provides a device for purifying hydrogen from refinery gas, which at least comprises:

[0006] at least one first input conduit;

[0007] at least one first separation unit connected to the first input pipeline;

[0008] at least one continuous catalytic reforming hydrogen-pressure swing adsorption unit, arranged on a side of the first separation unit away from the first input pipeline;

[0009] at least one second input conduit;

[0010] at least one second separation unit connected to the second input pipeline;

[0011] At least one low-gas pressure swing adsorption unit, arranged on a side of the second separation unit away from the second input pipeline;

[0012] a connecting pipe connecting one of the first input pipes and one of the second input pipes; and

[0013] The transmission pipeline is arranged between adjacent units.

[0014] In an embodiment of the present invention, the device comprises at least one control valve, and the control valve is arranged on the connecting pipeline.

[0015] In an embodiment of the utility model, the device comprises at least one discharge valve, and the discharge valve is arranged on the connecting pipe on one side of the control valve.

[0016] In an embodiment of the present invention, when the number of the first input pipelines is greater than or equal to two, a plurality of the first input pipelines are connected in parallel.

[0017] In an embodiment of the present invention, when the number of the first separation units is greater than or equal to two, a plurality of the first separation units are connected in parallel and then connected in series with the first input pipeline.

[0018] In one embodiment of the utility model, the continuous catalytic reforming hydrogen-pressure swing adsorption unit includes a first continuous catalytic reforming hydrogen-pressure swing adsorption unit and a second continuous catalytic reforming hydrogen-pressure swing adsorption unit, the first continuous catalytic reforming hydrogen-pressure swing adsorption unit is arranged on a side of the first separation unit away from the first input pipeline, and the second continuous catalytic reforming hydrogen-pressure swing adsorption unit is arranged on a side of another first separation unit away from the first input pipeline.

[0019] In one embodiment of the utility model, the reforming hydrogen-pressure swing adsorption unit also includes a third continuous catalytic reforming hydrogen-pressure swing adsorption unit. The first continuous catalytic reforming hydrogen-pressure swing adsorption unit and the second continuous catalytic reforming hydrogen-pressure swing adsorption unit are connected in parallel and then connected in series with the third continuous catalytic reforming hydrogen-pressure swing adsorption unit.

[0020] In an embodiment of the present invention, the second input pipeline includes a first pipeline and a second pipeline, and the first pipeline and the second pipeline are arranged in parallel.

[0021] In one embodiment of the present invention, the device further comprises an amine removal unit, and the amine removal unit is arranged between the parallel main path of the first pipeline and the second pipeline and the second separation unit.

[0022] In one embodiment of the present invention, the second input pipeline further includes a third pipeline and a fourth pipeline, and the amine removal unit, the third pipeline and the fourth pipeline are arranged in parallel.

[0023] In summary, the utility model proposes a device for purifying hydrogen from refinery gas, which can purify high-purity hydrogen from refinery gas. Moreover, the device provided by the utility model can solve the problem that the low-gas-pressure swing adsorption unit cannot be debugged due to low raw material flow in the initial stage of operation, speed up the start-up and commissioning progress of the low-gas-pressure swing adsorption unit, speed up the production progress, avoid the waste of refinery gas, and maintain the stable operation of the continuous catalytic reforming hydrogen-pressure swing adsorption unit.

[0024] Of course, any method of implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 The figure is a schematic diagram of the structure of a device for purifying hydrogen from refinery gas in one embodiment of the utility model.

[0027] Marking Description:

[0028] 11. First input pipeline; 111. First input pipe; 112. Second input pipe; 12. First separation unit; 131. First continuous catalytic reforming hydrogen-pressure swing adsorption (CCR-PSA) unit; 132. Second CCR-PSA unit; 133. Third CCR-PSA unit; 14. Second input pipeline; 141. First pipeline; 142. Second pipeline; 143. Third pipeline; 144. Fourth pipeline; 15. Second separation unit; 16. Low gas-pressure swing adsorption (ROG-PSA) unit; 17. Amine removal unit; 18. Connecting pipeline; 191. First control valve; 192. Second control valve; 20. Discharge valve; 21. Blind plate; 22. Separator; 23. Compressor; 24. Transmission pipeline; 25. Tee. DETAILED DESCRIPTION

[0029] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations. The details in the present invention can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0031] In the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, if the terms "first" and "second" appear, they are only used for description and distinction purposes, and cannot be understood as indicating or implying relative importance.

[0032] See also Figure 1 As shown, the utility model provides a device for purifying hydrogen from refinery gas, for example, including a first input pipeline 11, a first separation unit 12, a CCR-PSA unit, a second input pipeline 14, a second separation unit 15, a ROG-PSA unit 16 and a connecting pipeline 18. Among them, the first input pipeline 11, the first separation unit 12 and the CCR-PSA unit constitute a hydrogen recovery line, the second input pipeline 14, the second separation unit 15 and the ROG-PSA unit 16 constitute another hydrogen recovery line, and the connecting pipeline 18 connects a first input pipeline 11 and a second input pipeline 14. Through the CCR-PSA unit and the ROG-PSA unit 16, the device provided by the utility model can separate hydrogen from the refinery gas, and the hydrogen can be used for the public auxiliary engineering and chemical raw materials of the factory. Moreover, through the connecting pipe 18, the device provided by the utility model introduces part of the raw materials of the CCR-PSA unit into the raw materials of the ROG-PSA unit 16, which can solve the problem that the ROG-PSA unit 16 cannot be debugged due to insufficient raw materials of the ROG-PSA unit 16 at the beginning of the start-up of the refinery device, speeding up the debugging progress of the ROG-PSA unit 16 and speeding up the production progress. At the same time, the device provided by the utility model can reduce the load of the CCR-PSA unit, avoid overload operation of the CCR-PSA, and maintain the long-term stable operation of the CCR-PSA unit.

[0033] See also Figure 1As shown, in one embodiment of the utility model, the first input pipeline 11 is used as the raw material input pipeline of the CCR-RSA unit to input raw materials to the CCR-PSA unit. Among them, the first input pipeline 11 is, for example, at least one, and when the number of the first input pipelines 11 is greater than or equal to two, multiple first input pipelines 11 are, for example, connected in parallel. In this embodiment, the first input pipeline 11 is, for example, two, and the first input pipeline 11 includes, for example, a first input pipe 111 and a second input pipe 112, and the first input pipe 111 and the second input pipe 112 are arranged in parallel. Among them, the first input pipe 111, for example, transports reformed hydrogen materials, and the reformed hydrogen materials come from a continuous reforming device. The second input pipe 112, for example, transports disproportionated tail hydrogen materials, and the disproportionated tail hydrogen materials come from a disproportionation device. The main components of the disproportionated tail hydrogen materials include, for example, hydrogen, methane, ethane and propane, and the content of hydrogen in the disproportionated tail hydrogen is, for example, 5-7wt%, and for example, 6.67wt%. Therefore, the material transported in the first input pipeline 11 is rich in a large amount of hydrogen and needs to be transported to the CCR-PSA unit for further purification to avoid waste.

[0034] See also Figure 1 As shown, in one embodiment of the utility model, the first separation unit 12 is connected to the first input pipeline 11 to separate the raw material transported in the first input pipeline 11 into gas and liquid, so as to avoid the raw material entering the subsequent CCR-PSA unit with liquid, which affects the adsorption effect of the CCR-PSA unit. Among them, the first separation unit 12 is at least one, for example. When the first separation unit 12 is greater than or equal to two, the multiple first separation units 12 are connected in parallel and connected in series with the first input pipeline 11. In this embodiment, the first separation unit 12 is, for example, two, and the two first separation units 12 are arranged in parallel on the same side of the first input pipeline 11. The raw materials in the first input pipeline 11 enter the two first separation units 12 respectively for separation, so as to improve the separation efficiency of the first separation unit 12. Among them, the first separation unit 12 is, for example, a gas-liquid separator, and is also, for example, a gravity settler, an inertial separator, a fiber filter separator or a cyclone separator.

[0035] See also Figure 1As shown, in one embodiment of the utility model, the first separation unit 12 performs gas-liquid separation on the raw material in the first input pipeline 11, and the separated liquid contains, for example, dirty oil, etc. The separated liquid enters the collection unit from the bottom of the first separation unit 12. The gas separated by the first separation unit 12 enters the waste gas unit or the CCR-PSA unit from the top of the first separation unit 12. When the gas separated by the first separation unit 12 meets the requirements of the CCR-PSA unit for purity and flow, the gas separated by the first separation unit 12 enters the CCR-PSA unit for hydrogen purification. When the gas separated by the first separation unit 12 does not meet the requirements of the CCR-PSA unit for purity and flow, the gas separated by the first separation unit 12 enters the waste gas unit, and the waste gas unit introduces the gas into the flare unit or treats it as fuel gas.

[0036] See also Figure 1 As shown, in one embodiment of the utility model, the CCR-PSA unit is arranged on the side of the first separation unit 12 away from the first input pipeline 11, and the material from the first separation unit 12 is subjected to pressure swing adsorption to purify the hydrogen in the material. Among them, the CCR-PSA unit is, for example, at least one. In this embodiment, the CCR-PSA unit includes, for example, a first CCR-PSA unit 131, a second CCR-PSA unit 132, and a third CCR-PSA unit 133. Among them, the first CCR-PSA unit 131 and the second CCR-PSA unit 132 are arranged in parallel, and after the first CCR-PSA unit 131 and the second CCR-PSA unit 132 are connected in parallel, they are arranged in series with the third CCR-PSA unit 133. Specifically, the first CCR-PSA unit 131 is arranged on a side of a first separation unit 12 away from the first input pipeline 11, the second CCR-PSA unit 132 is arranged on a side of another first separation unit 12 away from the first input pipeline 11, and the third CCR-PSA unit 133 is arranged on a side of the first CCR-PSA unit 131 and the second CCR-PSA unit 132 away from the first separation unit 12. The raw materials from the first separation unit 12 enter the first CCR-PSA unit 131 and the second CCR-PSA unit 132 respectively for separation, and hydrogen is extracted and enters the hydrogen use unit.

[0037] See also Figure 1As shown, in one embodiment of the utility model, the hydrogen unit is connected to the first CCR-PSA unit 131, the second CCR-PSA unit 132 and the ROG-PSA unit 16 respectively. After the hydrogen in the refinery gas is separated by the first CCR-PSA unit 131, the second CCR-PSA unit 132 and the ROG-PSA unit 16, it enters the hydrogen unit for treatment. When the purity of the hydrogen meets the requirements, the hydrogen unit is a hydrogen pipeline network, and the hydrogen enters the hydrogen pipeline network and is used as a chemical raw material or public auxiliary engineering. When the purity of the hydrogen does not meet the requirements, the hydrogen unit is a flare unit, and the hydrogen that does not meet the purity requirements is burned as fuel.

[0038] See also Figure 1 As shown, in one embodiment of the present invention, the separator 22 is arranged on the side of the ROG-PSA unit 16 away from the second separation unit 15, the side of the first CCR-PSA unit 131 away from the first separation unit 12, and the side of the second CCR-PSA unit 132 away from the first separation unit 12. The separator 22 performs gas-liquid separation on the decomposed gas of the first CCR-PSA unit 131, the second CCR-PSA unit 132, and the ROG-PSA unit 16 to remove the liquid in the decomposed gas. The separator 22 is, for example, a gas-liquid separator, and also, for example, a gravity settler, an inertial separator, a fiber filter separator, or a cyclone separator.

[0039] See also Figure 1 As shown, in one embodiment of the utility model, when the first CCR-PSA unit 131 and the second CCR-PSA unit 132 are saturated with adsorption, the first CCR-PSA unit 131 and the second CCR-PSA unit 132 are analyzed, and the analyzed gas is separated into gas and liquid by the separator 22, and the separated gas enters the flare unit or the third CCR-PSA unit 133. When the gas separated from the analyzed gas meets the requirements of the third CCR-PSA unit 133 for purity and flow, the gas enters the third CCR-PSA unit 133 for hydrogen purification to recover the hydrogen in the analyzed gas to avoid waste. When the gas separated from the analyzed gas does not meet the requirements of the CCR-PSA unit 133 for purity and flow, the gas enters the flare unit for combustion treatment.

[0040] See also Figure 1As shown, in one embodiment of the present invention, the second input pipeline 14 is used as a raw material input pipeline of the ROG-PSA unit 16 to transport raw materials to the ROG-PSA unit 16. Among them, the second input pipeline 14 is, for example, at least one. In this embodiment, the second input pipeline 14 is, for example, four, and the second input pipeline 14 includes, for example, a first pipeline 141, a second pipeline 142, a third pipeline 143, and a fourth pipeline 144, etc. The first pipeline 141 and the second pipeline 142 are arranged in parallel, and the third pipeline 143, the fourth pipeline 144 and the amine removal unit 17 are arranged in parallel. Among them, the first pipeline 141, for example, transports diesel wax oil low-gas materials, which come from a diesel wax oil hydrogenation unit, the second pipeline 142, for example, transports wax oil cracking low-gas materials, which come from a wax oil hydrogenation unit, the third pipeline 143, for example, transports fluidized bed permeate gas materials, which come from a fluidized bed hydrogenation unit, and the fourth pipeline 144, for example, transports ethylene hydrogen materials, which come from an ethylene unit.

[0041] See also Figure 1 As shown, in one embodiment of the utility model, the amine removal unit 17 is arranged between the parallel main path of the first pipeline 141 and the second pipeline 142 and the second separation unit 15. Since the ammonia nitrogen impurity content in the raw materials transported by the first pipeline 141 and the second pipeline 142 is high, the amine removal unit 17 is arranged to remove the ammonia nitrogen in the raw materials transported by the first pipeline 141 and the second pipeline 142 to prevent ammonium salts from corroding the subsequent second separation unit 15 and the ROG-PSA unit 16. The amine removal unit 17 is, for example, an absorption tower, an adsorption tower, a stripping tower or an amine removal device.

[0042] See also Figure 1 As shown, in one embodiment of the utility model, the second separation unit 15 is connected to the second input pipeline 14. The second separation unit 15 is, for example, at least one. In this embodiment, the second separation unit 15 is, for example, one, and the amine removal unit 17, the third pipeline 143 and the fourth pipeline 144 are connected in parallel and then connected in series with the second separation unit to separate the raw material transported in the second input pipeline 14 from gas and liquid, so as to avoid the raw material entering the subsequent ROG-PSA unit 16 and the waste gas unit with liquid, which affects the adsorption effect of the ROG-PSA unit 16. The second separation unit 15 is, for example, a gas-liquid separator, and is also, for example, a gravity settler, an inertial separator, a fiber filter separator or a cyclone separator.

[0043] See also Figure 1As shown, in one embodiment of the utility model, the gas separated by the second separation unit 15 enters the exhaust unit or the ROG-PSA unit 16. When the gas separated by the second separation unit 15 meets the requirements of the ROG-PSA unit 16 for purity and flow, the gas separated by the second separation unit 15 enters the ROG-PSA unit 16 for hydrogen purification. When the gas separated by the second separation unit 15 does not meet the requirements of the ROG-PSA unit 16 for purity and flow, the gas separated by the second separation unit 15 enters the exhaust unit, and the exhaust unit introduces the gas into the flare unit or treats it as fuel gas.

[0044] See also Figure 1 As shown, in one embodiment of the utility model, the ROG-PSA unit 16 is arranged on the side of the second separation unit 15 away from the second input pipeline 14, and the material from the second separation unit 15 is subjected to pressure swing adsorption to purify the hydrogen in the material. Among them, there is at least one ROG-PSA unit 16, for example. In this embodiment, there is one ROG-PSA unit 16, for example, and the raw material from the second separation unit 15 enters the ROG-PSA unit 16 for separation, and the hydrogen is extracted and enters the hydrogen use unit. When the ROG-PSA unit 16 is saturated with adsorption, the ROG-PSA unit 16 is analyzed, and the analyzed gas is sent to the subsequent separator 22 for gas-liquid separation.

[0045] See also Figure 1 As shown, in one embodiment of the utility model, the separator 22 separates the analytical gas of the ROG-PSA unit 16, and the separated gas enters the flare unit or the dry gas recovery unit. When the gas separated from the analytical gas meets the requirements of the dry gas recovery unit for purity and flow, the gas enters the dry gas recovery unit to avoid waste. When the gas separated from the analytical gas does not meet the requirements of the dry gas recovery unit for purity and flow, the gas enters the flare unit for combustion treatment.

[0046] See also Figure 1 As shown, in one embodiment of the present invention, the compressor 23 is connected in series with the separator 22 near the side of the ROG-PSA unit 16 to increase the pressure of the desorbed gas to meet the pressure requirement of the subsequent dry gas recovery unit for the gas, and the dry gas recovery unit processes the desorbed gas as fuel or chemical raw material. The compressor 23 is, for example, a positive displacement compressor or a dynamic compressor.

[0047] See also Figure 1As shown, in one embodiment of the present invention, the connecting pipe 18 connects a first input pipe 11 and a second input pipe 14 to introduce the raw material transported in the first input pipe 11 into the second input pipe 14. In this embodiment, the connecting pipe 18 connects the second input pipe 112 and the first pipe 141, for example, to introduce the raw material in the second input pipe 112 into the first pipe 141.

[0048] See also Figure 1 As shown, in one embodiment of the present invention, during the normal operation of the entire device, the design flow rate of the first input pipe 111 is, for example, 500,000-550,000 Nm 3 / h, the design flow rate of the second input pipe 112 is, for example, 10000-15000Nm 3 / h, the design flow rate of the first pipeline 141 is, for example, 30000-35000Nm 3 / h, the design flow rate of the second pipeline 142 is, for example, 30000-35000Nm 3 / h, the design flow rate of the third pipeline 143 is, for example, 15000-18000Nm 3 / h, the design flow rate of the fourth pipeline 144 is, for example, 85000-90000Nm 3 At the beginning of the whole device operation, the actual flow rate of the first input pipe 111 is, for example, 200000-250000Nm 3 / h, the actual flow rate of the second input pipe 112 is, for example, 27000-32000Nm 3 / h, the actual flow rate of the first pipeline 141 is, for example, 10000-15000Nm 3 / h, the actual flow rate of the second pipeline 142 is, for example, 10000-20000Nm 3 / h, the actual flow rate of the third pipeline 143 is, for example, 0Nm 3 / h, the actual flow rate of the fourth pipeline 144 is, for example, 0Nm 3 / h. Therefore, by connecting the pipeline 18, the raw materials in the second input pipe 112 are introduced into the first pipeline 141 at the beginning of the operation, which can solve the problem that the ROG-PSA unit 16 cannot be debugged due to insufficient raw materials, speed up the debugging progress of the ROG-PSA unit 16, and increase the production progress. Moreover, by connecting the pipeline 18, the materials in the second input pipe 112 that exceed the design flow rate can be led out, reducing the load of the CCR-PSA unit and maintaining the stable operation of the CCR-PSA unit.

[0049] See also Figure 1As shown, in one embodiment of the utility model, a control valve is arranged on the connecting pipe 18 to control whether the material in the second input pipe 112 is transported to the first pipe 141. There is at least one control valve, for example. In this embodiment, there are two control valves, for example, including a first control valve 191 and a second control valve 192, etc. The first control valve 191 is arranged on one side of the second input pipe 112, and the second control valve 192 is arranged on the connecting pipe 18 between the first pipe 141 and the first control valve 191.

[0050] See also Figure 1 As shown, in one embodiment of the utility model, the discharge valve 20 is arranged on the connecting pipe 18 on one side of the control valve. Among them, the discharge valve 20 is, for example, at least one. In this embodiment, the discharge valve 20 is, for example, one, and the discharge valve 20 is, for example, arranged between the first control valve 191 and the second control valve 192 to empty the raw materials in the connecting pipe 18, so as to facilitate the maintenance of the connecting pipe 18.

[0051] See also Figure 1 As shown, in one embodiment of the utility model, a blind plate 21 is arranged between the discharge valve 20 and the second control valve 192. Among them, the blind plate 21 is, for example, at least one. In this embodiment, the blind plate 21 is, for example, one, to completely cut off the material transportation in the connecting pipeline 18, and to facilitate the inspection of the valve or pipeline. Among them, the blind plate 21 is, for example, an eight-shaped blind plate, a plate-type flat blind plate or a plug plate.

[0052] See also Figure 1 As shown, in one embodiment of the utility model, the tee 25 is arranged between the second input pipe 112 and the connecting pipe 18, and between the connecting pipe 18 and the first pipe 141, so as to change the flow direction of the raw material, so that the raw material in the second input pipe 112 can be transported to the first pipe 141. In this embodiment, the nominal diameters of the interfaces of the tee 25 are respectively matched with the second input pipe 112, the connecting pipe 18 and the first pipe 141, so as to avoid leakage of the raw material at the pipe connection. Among them, the tee 25 is, for example, an equal diameter tee or a different diameter tee, and another example is an equal diameter tee, and the nominal diameter of the equal diameter tee is, for example, 100-500mm, and another example is 200mm.

[0053] See also Figure 1 As shown, the transmission pipeline 24 is arranged between adjacent units to transmit gas. The transmission pipeline 24 is, for example, a seamless steel pipe or a seamless stainless steel pipe, and the connection between the transmission pipelines 24 is, for example, welding, threaded connection or flange connection, so as to prevent gas leakage in the transmission pipeline 24 and cause danger.

[0054] In summary, the utility model proposes a device for purifying hydrogen from refinery gas, which can separate high-purity hydrogen from refinery gas and avoid waste of refinery gas. Moreover, the device provided by the utility model introduces part of the raw materials in the continuous catalytic reforming hydrogen-pressure swing adsorption unit into the raw materials of the low-fraction gas-pressure swing adsorption unit through a connecting pipeline, which can solve the problem that the low-fraction gas-pressure swing adsorption unit cannot be debugged due to low raw material flow in the initial stage of start-up, speed up the start-up and debugging progress of the low-fraction gas-pressure swing adsorption unit, speed up the production progress, avoid waste of refinery gas, and maintain the stable operation of the continuous catalytic reforming hydrogen-pressure swing adsorption unit.

[0055] References throughout the specification to "one embodiment," "an embodiment," or "a specific embodiment" mean that the specific features, structures, or characteristics described in conjunction with the embodiment are included in at least one embodiment of the utility model, and not necessarily in all embodiments. Thus, the various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics of any specific embodiment of the utility model may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the utility model embodiments described and shown herein may be based on the teachings herein and will be considered part of the spirit and scope of the utility model.

[0056] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the concept of the utility model, such as the technical solution formed by replacing the above-mentioned features with the technical features with similar functions disclosed in this application (but not limited to). In addition to the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present utility model, the remaining technical features will not be repeated here.

Claims

1. A device for purifying hydrogen from refinery gas, characterized in that: At least: at least one first input conduit; at least one first separation unit connected to the first input pipeline; at least one continuous catalytic reforming hydrogen-pressure swing adsorption unit, arranged on a side of the first separation unit away from the first input pipeline; at least one second input conduit; at least one second separation unit connected to the second input pipeline; At least one low-gas pressure swing adsorption unit, arranged on a side of the second separation unit away from the second input pipeline; a connecting pipe connecting one of the first input pipes and one of the second input pipes; and The transmission pipeline is arranged between adjacent units.

2. The device according to claim 1, characterized in that The device comprises at least one control valve, which is arranged on the connecting pipe.

3. The device according to claim 2, characterized in that The device comprises at least one discharge valve, which is arranged on the connecting pipe on one side of the control valve.

4. The device according to claim 1, characterized in that When the number of the first input pipelines is greater than or equal to two, a plurality of the first input pipelines are connected in parallel.

5. The device according to claim 4, characterized in that When the number of the first separation units is greater than or equal to two, a plurality of the first separation units are connected in parallel and then connected in series with the first input pipeline.

6. The device according to claim 5, characterized in that The continuous catalytic reforming hydrogen-pressure swing adsorption unit includes a first continuous catalytic reforming hydrogen-pressure swing adsorption unit and a second continuous catalytic reforming hydrogen-pressure swing adsorption unit. The first continuous catalytic reforming hydrogen-pressure swing adsorption unit is arranged on a side of the first separation unit away from the first input pipeline, and the second continuous catalytic reforming hydrogen-pressure swing adsorption unit is arranged on a side of another first separation unit away from the first input pipeline.

7. The device according to claim 6, characterized in that The reforming hydrogen-pressure swing adsorption unit also includes a third continuous catalytic reforming hydrogen-pressure swing adsorption unit. The first continuous catalytic reforming hydrogen-pressure swing adsorption unit and the second continuous catalytic reforming hydrogen-pressure swing adsorption unit are connected in parallel and then connected in series with the third continuous catalytic reforming hydrogen-pressure swing adsorption unit.

8. The device according to claim 1, characterized in that The second input pipeline includes a first pipeline and a second pipeline, and the first pipeline and the second pipeline are arranged in parallel.

9. The device according to claim 8, characterized in that The device further comprises an amine removal unit, which is arranged between a parallel main path of the first pipeline and the second pipeline and the second separation unit.

10. The device according to claim 9, characterized in that The second input pipeline also includes a third pipeline and a fourth pipeline, and the amine removal unit, the third pipeline and the fourth pipeline are arranged in parallel.

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