Heating device and purification system

Abstract

This invention provides a heating device and a purification system. The heating device is used to heat the regeneration stream used to regenerate the adsorber. The piping system is configured to switch between a first mode, a second mode, and a third mode. In the first mode, the piping system allows the regeneration stream to reach the adsorber via a steam heater while prohibiting it from passing through an electric heater. In the second mode, the piping system allows the regeneration stream to reach the adsorber via an electric heater while prohibiting it from passing through a steam heater. In the third mode, the piping system allows the regeneration stream to reach the adsorber consecutively via both a steam heater and an electric heater. This heating device can heat the regeneration stream with low cost and high reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to air separation field, specifically, relate to a kind of heating device and purification system. BACKGROUND

[0002] The purification system is usually equipped with two or more adsorbers. The adsorbers are often vessels containing adsorbents, such as alumina and molecular sieves. After a certain time of adsorption, the adsorbers need to be regenerated with a clean, low-pressure, heated regeneration stream. For example, in air separation plants, often the exhaust gases from the cold box, such as exhaust nitrogen, exhaust oxygen, etc., are used as regeneration gas. Usually, the regeneration stream needs to be heated to a sufficiently high temperature, usually above 130 degrees.

[0003] How to design a heating device that can reliably heat the regeneration stream at low cost is a topic that needs to be considered. SUMMARY

[0004] The purpose of the utility model is to provide a kind of heating device, can heat regeneration stream at low cost and high reliability.

[0005] The utility model provides a kind of heating device, for heating the regeneration stream that makes adsorber regenerate, including pipeline system. The heating device further includes steam heater and electric heater. The pipeline system includes pipe system and pipe regulation component. Pipe regulation component is set so that pipe system switches between first mode, second mode and third mode. Wherein, in the first mode, pipe system allows regeneration stream to pass through steam heater to reach adsorber and prohibits regeneration stream to pass through electric heater. In the second mode, pipe system allows regeneration stream to pass through electric heater to reach adsorber and prohibits regeneration stream to pass through steam heater. In the third mode, pipe system allows regeneration stream to pass through steam heater and electric heater in succession to reach adsorber.

[0006] In one embodiment, the pipe system includes first pipe and second pipe arranged in parallel and provided with steam heater and electric heater respectively. The common inlet of first pipe and second pipe is connected to the gas source of regeneration stream, and the common outlet leads to the adsorber. The pipe system further includes an intermediate pipe connecting the first pipe and the second pipe. The pipe regulation component includes first control valve and second control valve arranged in the first pipe and the second pipe respectively. The first control valve is arranged between the common inlet and the steam heater. The second control valve is arranged between the common inlet and the electric heater. The pipe regulation component further includes a first switch valve arranged in the first pipe. The first switch valve is arranged between the first connection site and the common outlet, and the first connection site is the position of the first pipe connecting the intermediate pipe.

[0007] In one embodiment, the first connection is between the steam heater and the common outlet, and the second connection of the second line connecting the intermediate line is between the common inlet and the electric heater. The second control valve is arranged between the common inlet and the second connection.

[0008] In one embodiment, the line system further comprises an additional line in parallel with the first line and the second line. The additional line is provided with an additional control valve. In the first mode, the second mode and the third mode, the line system is brought into a cold blow state by closing the first control valve and the second control valve and opening the additional control valve. In the cold blow state, the additional line is the path through which the regeneration stream passes as a cold blow stream.

[0009] In one embodiment, the line regulating assembly further comprises a second on-off valve arranged in the intermediate line, or arranged in the first line between the first connection and the steam heater.

[0010] In one embodiment, the line regulating assembly further comprises a third on-off valve arranged in the second line between the second connection and the common outlet. The line system is switched to the first mode by opening the first on-off valve and the second on-off valve and closing the third on-off valve, to the second mode by closing the first on-off valve and the second on-off valve and opening the third on-off valve, and to the third mode by closing the first on-off valve and opening the second on-off valve and the third on-off valve.

[0011] In one embodiment, the third on-off valve is arranged between the electric heater and the common outlet.

[0012] In one embodiment, the line regulating assembly further comprises a fourth on-off valve arranged in the second line between the electric heater and the second connection.

[0013] In one embodiment, each on-off valve is a manual valve, and the line system is switched between the modes by manually opening and closing each on-off valve. In any mode, the line system is switched between a hot blow state and a cold blow state by opening and closing each control valve. In the hot blow state, the regeneration stream is heated by the steam heater and / or the electric heater before entering the adsorber, and in the cold blow state, the regeneration stream directly enters the adsorber as a cold blow stream.

[0014] The utility model provides a kind of purification system for air separation equipment, comprising at least two adsorbers arranged to alternately carry out adsorption operation and regeneration operation. The purification system further comprises the heating device described above, and the common outlet of the first line and the second line of the line system of the heating device is communicated with the at least two adsorbers.

[0015] The heating device can use the steam heater alone, use the electric heater alone, or use the steam heater and the electric heater in series, so that the steam heater can be used as much as possible, and the electric heater can be used to ensure the reliability of heating. That is, the heating device can heat the regeneration stream at low cost and high reliability. Moreover, the heating device can be switched to different modes according to actual conditions, and has higher versatility. BRIEF DESCRIPTION OF DRAWINGS

[0016] The advantages and spirits of the present application can be further understood through the following detailed description and drawings.

[0017] Figure 1 is a schematic view according to an embodiment of the present application.

[0018] Figure 2 is a schematic view according to a first variant.

[0019] Figure 3 is a schematic view according to a second variant.

[0020] Figure 4 is a schematic view according to a third variant.

[0021] Figure 5 is a schematic view according to a fourth variant. DETAILED DESCRIPTION

[0022] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, the present application should be understood as not being limited to the following described embodiments, and the technical concept of the present application can be implemented in combination with other known technologies or functions, or with other technologies that are the same as those known technologies.

[0023] The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the specification and relevant art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein. Well-known functions or constructions can not be described in detail for brevity and / or clarity.

[0024] For example, the first feature is formed above or on the second feature as described later in the specification can include an embodiment in which the first feature and the second feature are formed by direct connection, and can include an embodiment in which an additional feature is formed between the first feature and the second feature, so that the first feature and the second feature can not be directly connected. Further, when a first element is described as connected or coupled to a second element, the description includes an embodiment in which the first element and the second element are directly connected or coupled to each other, and an embodiment in which one or more other intervening elements are added to indirectly connect or couple the first element and the second element to each other.

[0025] The regeneration system can be equipped with a steam heater or an electric heater as a heating device for the regeneration stream. The steam heater, as the name implies, is a device that uses high-temperature steam in the plant for heating. Since the output of high-temperature steam can be continuous, it cannot be turned on or off. The electric heater, on the other hand, is a device that uses electricity to convert electrical energy into heat energy for heating, and can be turned on or off immediately. The operating cost of steam is much lower than that of electricity.

[0026] As a comparative example, the electric heater can be used as a backup for the steam heater, and the two can be used in parallel. In this way, when the steam heater malfunctions, the electric heater can be switched to heat the regeneration stream.

[0027] However, in actual operation, the inventors have found that sometimes the steam quality is not good enough or there is a leak, and the regeneration stream cannot be heated to the required temperature, but the steam flow is large enough to actually have some heating effect. In addition to using the steam heater and the electric heater in parallel and choosing one to use, the inventors have analyzed that the steam heater and the electric heater can also be used in series. For example, the regeneration stream can be first heated to a certain temperature by the steam heater, and then further heated to a higher required temperature by the electric heater. In this way, operating costs can be saved.

[0028] As shown in Figure 1 The utility model provides a heating device 10 for heating the regeneration stream g0 for regenerating the adsorber 20. The regeneration stream g0 is commonly a regeneration gas, for example, which is waste gas in an air separation plant. The heating device 10 comprises a piping system 3. The heating device 10 further comprises a steam heater 1 and an electric heater 2. It can be understood that the drawings in the specification are only examples and are not necessarily drawn to scale, and should not be considered as limiting the actual scope of protection required by the utility model.

[0029] The piping system 3 comprises a piping system 4 and a piping adjustment assembly 5. The piping adjustment assembly 5 is configured to switch the piping system 4 between a first mode M1, a second mode M2 and a third mode M3.

[0030] In the first mode M1, the piping system 4 allows the regeneration stream g0 to pass through the steam heater 1 to the adsorber 20 and prohibits the regeneration stream g0 from passing through the electric heater 2. In the second mode M2, the piping system 4 allows the regeneration stream g0 to pass through the electric heater 2 to the adsorber 20 and prohibits the regeneration stream g0 from passing through the steam heater 1. In the third mode M3, the piping system 4 allows the regeneration stream g0 to pass through the steam heater 1 and the electric heater 2 in succession to the adsorber 20.

[0031] It can be understood that, in any mode, the piping system 4 allows the regeneration stream g0 to pass through different paths to the adsorber 20, which mainly expresses the difference between the modes, rather than limiting the regeneration stream g0 to pass through only the fixed path to the adsorber 20 at all time periods in any mode, but the prohibition effect is effective at all time periods. For example, as mentioned later, in fact, the piping system 4 needs to have two states (in fact, two modes that can be switched with each other) corresponding to any mode, namely, a hot blow state and a cold blow state. In the cold blow state, the regeneration stream g0 does not need to pass through any heater, but directly reaches the adsorber 20 without heating. In addition, "passing through the steam heater 1 and the electric heater 2 in succession" here means passing through the two heaters in series in succession, and does not limit the order. Preferably, as shown in the third mode M3, the regeneration stream g0 can pass through the steam heater 1 first and then pass through the electric heater 2. Figures 1 to 5

[0032] The terms "first", "second", "third", etc. are only for descriptive purposes and are not intended to indicate or imply relative importance or a specific number of technical features indicated. Therefore, the features limited by "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more than two (i.e. more than two), unless otherwise specified. Similarly, the limiting language appearing in the text, such as "one", is not intended to limit the number, but to describe the technical features that have not appeared in the preceding text. Similarly, unless the noun is modified by a specific number quantifier, the text should be considered to include both singular and plural forms, and in the technical solution, it can include a single technical feature or a plurality of technical features. Similarly, the modifying language such as "about", "more than" appearing before the number in the text usually includes the number, and its specific meaning should be understood in combination with the context.

[0033] ​In the heating device 10 for heating the regeneration stream g0, the pipe regulating assembly 5 cooperates with the pipe system 4 to enable switching between three modes: heating the regeneration stream g0 by the steam heater 1 only, heating the regeneration stream g0 by the electric heater 2 only, and heating the regeneration stream g0 by the steam heater 1 and the electric heater 2 in series. Thus, different heating methods can be selected according to different situations. In particular, the first mode M1 is used when the steam heater 1 can heat the regeneration stream g0 to the required temperature. The second mode M2 is used when the steam heater 1 is not available. The third mode M3 is used when the steam heater 1 can heat the regeneration stream g0 but cannot heat it to the required temperature. Thus, the reliability of the heating device and even the entire purification system can be ensured while saving costs as much as possible.

[0034] Referring to Figure 1 , the pipe system 4 can include a first pipe 41 and a second pipe 42 arranged in parallel and provided with the steam heater 1 and the electric heater 2 respectively, and the common inlet 4n of the first pipe 41 and the second pipe 42 is connected to the gas source 30 of the regeneration stream g0, and the common outlet 4u leads to the adsorber 20.

[0035] It should be understood that the "common inlet" and the "common outlet" herein do not particularly limit a point, but can refer to any point where two or more pipes converge according to actual needs. For example, referring to Figure 1 , for ease of understanding, the common inlet 4n can actually be any point in the horizontal path between the point n1 and the point n2, including the point n1 and the point n2, which is exemplarily depicted by the thick line. The common outlet 4u can actually be any point in the L-shaped path between the point u1 and the point u2, including the point u1 and the point u2, which is exemplarily depicted by the thick line. For example, it is described later that "the first control valve 51 is arranged between the common inlet 4n and the steam heater 1", which means that the first control valve 51 should be arranged between the steam heater 1 and the point n2, which is the closest position to the steam heater 1 in the common inlet 4n. For another example, it is described later that "the first on-off valve 61 is arranged between the first connection point P1 and the common outlet 4u", which means that the first on-off valve 61 is arranged between the first connection point P1 and the point u1, which is the closest position to the first connection point P1 in the common outlet 4u.

[0036] The pipeline system 4 can further include an intermediate pipeline 44 connecting the first pipeline 41 and the second pipeline 42. That is, one end of the intermediate pipeline 44 is connected to the first pipeline 41 (e.g., at a first connection site P1 described later) to communicate with the first pipeline 41, and the other end of the intermediate pipeline 44 is connected to the second pipeline 42 (e.g., at a second connection site P2 described later) to communicate with the second pipeline 42. Specifically, the fluid can flow from the partial pipeline section of the first pipeline 41 to the partial pipeline section of the second pipeline 42 via the intermediate pipeline 44 with the switching of different modes and different states, which will be described in detail later.

[0037] The pipeline regulating assembly 5 can include a first control valve 51 and a second control valve 52 arranged in the first pipeline 41 and the second pipeline 42, respectively. The first control valve 51 is arranged between the common inlet 4n and the steam heater 1, and the second control valve 52 is arranged between the common inlet 4n and the electric heater 2.

[0038] The pipeline regulating assembly 5 can further include a first switch valve 61 arranged in the first pipeline 41, and the first switch valve 61 is arranged between the first connection site P1 and the common outlet 4u, where the first connection site P1 is the position on the first pipeline 41 connecting the intermediate pipeline 44.

[0039] The above arrangement enables the heating device 10 to smoothly switch among the three modes with a simple combination of pipelines and valves. In the third mode M3, the regenerated stream g0 is first heated by the steam heater 1, and then further heated by the electric heater 2 to the appropriate required temperature, which can further save the operating cost.

[0040] The first connection site P1 can be between the steam heater 1 and the common outlet 4u, and the second connection site P2 on the second pipeline 42 connecting the intermediate pipeline 44 can be between the common inlet 4n and the electric heater 2. Further, the second control valve 52 can be arranged between the common inlet 4n and the second connection site P2. The above arrangement enables the heating device 10 to further smoothly switch among the three modes.

[0041] Referring to Figure 1 The pipeline system 4 can further include an additional pipeline 43 connected in parallel with the first pipeline 41 and the second pipeline 42, and the additional pipeline 43 is provided with an additional control valve 53. That is, the additional pipeline 43 shares the common inlet 4n with the first pipeline 41 and the second pipeline 42, and the additional pipeline 43 shares the common outlet 4u with the first pipeline 41 and the second pipeline 42.

[0042] In the first mode M1, the second mode M2 and the third mode M3, the pipeline system 4 is brought into a cold blow state by closing the first control valve 51 and the second control valve 52 and opening the additional control valve 53. In the cold blow state, the additional pipeline 43 is the path through which the regeneration stream g0 passes as a cold blow stream. Overall, the arrangement of the additional pipeline 43 and the additional control valve 53 makes it easier to switch to the cold blow state.

[0043] The pipeline regulating assembly 5 further comprises a second on-off valve 62 or 62m. The second on-off valve 62 or 62m is arranged on the intermediate pipeline 44, or, on the first pipeline 41 between the first connection point P1 and the steam heater 1. As shown in Figure 1 、 Figure 2 and Figure 4 , the second on-off valve 62 is arranged on the intermediate pipeline 44. As shown in Figure 3 and Figure 5 , the second on-off valve 62m is arranged on the first pipeline 41 between the first connection point P1 and the steam heater 1.

[0044] The arrangement of the second on-off valve 62 or 62m makes it easier to connect or disconnect the upstream pipeline section of the first pipeline 41 and the intermediate pipeline 44 (i.e. the second pipeline 42 to which the intermediate pipeline 44 is connected, further, at least a part of the pipeline section of the second pipeline 42), and also makes it easier to isolate the steam heater 1, so as to facilitate the maintenance of the steam heater 1.

[0045] Referring to Figures 1 to 3 , the pipeline regulating assembly 5 can further comprise a third on-off valve 63 arranged on the second pipeline 42 between the second connection point P2 and the common outlet 4u.

[0046] The pipeline system 4 can be switched to the first mode M1 by opening the first on-off valve 61 and the second on-off valve 62 and closing the third on-off valve 63 Figure 2 and Figure 3 , in the illustrated embodiment, the fourth on-off valve 64 is also closed), switched to the second mode M2 by closing the first on-off valve 61 and the second on-off valve 62 and opening the third on-off valve 63 Figure 2 and Figure 3 , in the illustrated embodiment, the fourth on-off valve 64 is also opened), and switched to the third mode M3 by closing the first on-off valve 61 and opening the second on-off valve 62 and the third on-off valve 63 Figure 2 and Figure 3 , in the illustrated embodiment, the fourth on-off valve 64 is also opened). The above arrangement further facilitates mode switching.

[0047] A third switch valve 63 can be arranged between the electric heater 2 and the common outlet 4u. This arrangement further facilitates control and switching.

[0048] With reference to Figure 2 and Figure 3 , the piping arrangement 5 can further comprise a fourth switch valve 64. The fourth switch valve 64 is arranged in the second piping 42 between the electric heater 2 and the second connection point P2. This arrangement further facilitates control and switching and makes it easy to isolate the electric heater 2 for maintenance of the electric heater 2.

[0049] The switch valves can be manual valves and the piping system 4 is switched between the modes by manually opening and closing the switch valves. The manual valves can be two-way valves such as the second switch valve 62 arranged in the intermediate piping 44 illustrated in Figure 1 and Figure 2 , or they can be one-way valves such as butterfly valves, for example the third switch valve 63 and the second switch valve 62m arranged in the first piping 41 illustrated in Figure 3 .

[0050] In any mode, the piping system 4 is switched between a hot blow state Th and a cold blow state Tc by opening and closing the control valves. In the hot blow state Th, the regeneration stream g0 is heated by the steam heater 1 and / or the electric heater 2 before entering the adsorber 20, and in the cold blow state Tc, the regeneration stream g0 enters the adsorber 20 directly as a cold blow stream.

[0051] In other words, the piping arrangement 5 comprises a control valve group consisting of the control valves 51, 52, 53, etc. and a switch valve group consisting of the switch valves 61, 62, 63, 64, etc. By pre-controlling the opening and closing of the switch valves of the switch valve group, mode switching can be achieved. After a mode is determined, the control valves of the control valve group can be automatically controlled by electrical signals so that the cold blow state Tc and the hot blow state Th can be changed. This arrangement can facilitate control even more.

[0052] For the embodiment of Figure 1 , the heating device 10 can be switched to the first mode M1 by opening the first switch valve 61, closing the second switch valve 62 and the third switch valve 63, and closing the second control valve 52. In the first mode M1, the heating device 10 can be in the hot blow state Th by opening the first control valve 51 and closing the additional control valve 53, in which case the regeneration stream g0 reaches the adsorber 20 in a relatively high temperature state by passing through the first control valve 51, the steam heater 1 and the first switch valve 61 in sequence. By closing the first control valve 51 and opening the additional control valve 53, the heating device 10 can be in the cold blow state Tc, in which case the regeneration stream g0 reaches the adsorber 20 in a relatively low temperature state by passing through the additional control valve 53.

[0053] Continue to combine Figure 1 For example, by closing the first switching valve 61 and the second switching valve 62, opening the third switching valve 63, and closing the first control valve 51, the heating device 10 can be switched to the second mode M2. In the second mode M2, by opening the second control valve 52 and closing the auxiliary control valve 53, the heating device 10 is in a hot-blowing state Th. At this time, the regenerated stream g0 passes through the second control valve 51, the electric heater 2, and the third switching valve 63 in sequence and reaches the adsorber 20 at a relatively high temperature. By closing the second control valve 52 and opening the auxiliary control valve 53, the heating device 10 can be in a cold-blowing state Tc. At this time, the regenerated stream g0 passes through the auxiliary control valve 53 and reaches the adsorber 20 at a relatively low temperature.

[0054] Continue to combine Figure 1 For example, by closing the first switching valve 61, opening the second switching valve 62 and the third switching valve 63, and closing the second control valve 52, the heating device 10 can be switched to the third mode M3. In the third mode M3, by opening the first control valve 51 and closing the auxiliary control valve 53, the heating device 10 is in a hot-blowing state Th. At this time, the regenerated stream g0 passes through the first control valve 51, the steam heater 1, the second switching valve 62, the electric heater 2, and the third switching valve 63 in sequence and reaches the adsorber 20 at a relatively high temperature. By closing the first control valve 51 and opening the auxiliary control valve 53, the heating device 10 can be in a cold-blowing state Tc. At this time, the regenerated stream g0 passes through the auxiliary control valve 53 and reaches the adsorber 20 at a relatively low temperature.

[0055] That is, in the third mode M3, during the hot blowing state, the regenerated stream g0 can be heated by the steam heater 1 in the upstream section of the first pipe 41 upstream of the first connection position P1, and then reach the downstream section of the second pipe 42 downstream of the second connection position P2 via the intermediate pipe 44, and reach the adsorber 20 via the downstream section.

[0056] When the steam heater 1 needs to be isolated for maintenance, the first switch valve 61, the second switch valve 62, and the first control valve 51 can be closed. When the electric heater 2 needs to be isolated for maintenance, the second switch valve 62, the third switch valve 63, and the second control valve 52 can be closed.

[0057] Figure 2 Compared to Figure 1 The main difference is that, Figure 2 The heating device 10a according to the first variant shown in the figure does not have an additional pipeline 43 and an additional control valve 53 installed therein, and a fourth switching valve 64 is provided separately.

[0058] for Figure 2In the first variant, the heating device 10a can be switched to the first mode Ml, for example, by opening the first and second on-off valves 61, 62, closing the third and fourth on-off valves 63, 64. In the first mode Ml, the heating device 10a can be in the hot blow state Th by opening the first control valve 51 and closing the second control valve 52, so that the regeneration stream g0 reaches the adsorber 20 in a relatively high temperature state by passing through the first control valve 51, the steam heater 1 and the first on-off valve 61 in sequence. By closing the first control valve 51 and opening the second control valve 52, the heating device 10a can be in the cold blow state Tc, so that the regeneration stream g0 reaches the adsorber 20 in a relatively low temperature state by passing through the second control valve 52, the second on-off valve 62 and the first on-off valve 61 in sequence. That is, in the cold blow state, the regeneration stream g0 can pass through the upstream pipe section of the second pipe line 42 upstream of the second connection point P2, then pass through the intermediate pipe line 44, then pass through the downstream pipe section of the first pipe line 41 downstream of the first connection point P1, and finally reach the adsorber 20.

[0059] Continuing with the first variant, Figure 2 In the second variant, the heating device 10a can be switched to the second mode M2, for example, by closing the first and second on-off valves 61, 62, opening the third and fourth on-off valves 63, 64, and closing the first control valve 51. In the second mode M2, the heating device 10a can be in the hot blow state Th by opening the second control valve 52 and turning on the electric heater 2 (i.e. energizing the electric heater 2), so that the regeneration stream g0 reaches the adsorber 20 in a relatively high temperature state by passing through the second control valve 52, the fourth on-off valve 64, the electric heater 2 (energized state) and the third on-off valve 63 in sequence. By opening the second control valve 52 and turning off the electric heater 2 (i.e. de-energizing the electric heater 2), the heating device 10a can be in the cold blow state Tc, so that the regeneration stream g0 still reaches the adsorber 20 by passing through the second control valve 52, the fourth on-off valve 64, the electric heater 2 (de-energized state) and the third on-off valve 63 in sequence, but since the electric heater 2 is in the de-energized state, the regeneration stream g0 is not heated, and thus reaches the adsorber 20 in a relatively low temperature state. It is understood that in the description of the regeneration stream g0 passing through the electric heater 2 in the hot blow state Th in other paragraphs herein, the electric heater 2 is generally in the energized state to heat the regeneration stream g0. The steam heater 1 is generally continuously energized with high temperature steam, and thus cannot be turned on and off.

[0060] Continuing with the second variant, Figure 2For example, the heating device 10a can be switched to the third mode M3 by closing the first switch valve 61, opening the second switch valve 62, the third switch valve 63 and the fourth switch valve 64. In the third mode M3, the heating device 10a can be in the hot blow state Th by opening the first control valve 51, closing the second control valve 52, and turning on the electric heater 2, so that the regeneration stream g0 passes through the first control valve 51, the steam heater 1, the second switch valve 62, the fourth switch valve 64, the electric heater 2 and the third switch valve 63 in sequence to reach the adsorber 20 at a relatively high temperature. By closing the first control valve 51, opening the second control valve 52, and turning off the electric heater 2, the heating device 10a can be in the cold blow state Tc, so that the regeneration stream g0 passes through the second control valve 52, the fourth switch valve 64, the electric heater 2 and the third switch valve 63 in sequence to reach the adsorber 20 at a relatively low temperature.

[0061] When the steam heater 1 needs to be isolated for maintenance, the first switch valve 61, the second switch valve 62 and the first control valve 51 can be closed. When the electric heater 2 needs to be isolated for maintenance, the fourth switch valve 64 and the third switch valve 63 can be closed.

[0062] Figure 3 The main difference between the heating device 10a shown in FIG. 1 and the heating device 10b shown in FIG. 2 is that the second switch valve 62m is arranged in the first pipeline 41 instead of the intermediate pipeline 44. Figure 2 Figure 3 The mode switching of the heating device 10b shown in FIG. 2 is similar to that of the heating device 10a shown in FIG. 1, and will not be described again here. When the steam heater 1 needs to be isolated for maintenance, only the first switch valve 61 and the second switch valve 62m need to be closed.

[0063] Figure 3 Figure 2 The main difference between the heating device 10a shown in FIG. 1 and the heating device 10c shown in FIG. 3 is that the third switch valve 63 and the fourth switch valve 64 are not arranged in the heating device 10c.

[0064] Figure 4 The mode switching of the heating device 10c shown in FIG. 3 is similar to that of the heating device 10a shown in FIG. 1, and will not be described again here. When the steam heater 1 needs to be isolated for maintenance, only the first switch valve 61 and the second switch valve 62 need to be closed. Figure 2 Figure 4 The main difference between the heating device 10a shown in FIG. 1 and the heating device 10c shown in FIG. 3 is that the third switch valve 63 and the fourth switch valve 64 are not arranged in the heating device 10c.

[0065] Figure 4 Figure 2 ​​​​There are some similarities, but the opening and closing of the third switching valve 63 and the fourth switching valve 64 are not involved, so they will not be described in detail here. It should be noted that in the first mode M1, since there are no third switching valves 63 and 64, the electric heater 2 cannot be completely isolated in the cold blowing state Tc. Usually, due to pipeline resistance, the cold blowing flow will self-balance. Most of the regeneration stream g0 reaches the adsorber 20 after passing through the second control valve 52, and then through the second switching valve 62 and the first switching valve 61. A small portion of the regeneration stream g0 reaches the adsorber 20 after passing through the electric heater 2.

[0066] Figure 5 Compared to Figure 4 The main difference is that, with Figure 3 Compared to Figure 2 The main differences are similar. Figure 5 In the heating device 10d according to the fourth variant shown in the figure, the second switching valve 62m is provided in the first pipe 41 instead of as... Figure 4 The setup shown is located in the intermediate conduit 44. Please refer to the preceding description; the operation will not be repeated here.

[0067] This invention also provides a purification system 100 for an air separation unit. The purification system 100 includes at least two adsorbers 20 configured to alternately perform adsorption and regeneration operations. The purification system 100 may also include the aforementioned heating device 10. The common outlet 4u of the first pipe 41 and the second pipe 42 of the piping system 4 of the heating device 10 is connected to the aforementioned at least two adsorbers 20.

[0068] The heating device 10 described above can be used to facilitate the smooth switching between the adsorption and regeneration operations of the aforementioned at least two adsorbers 20.

[0069] Unless otherwise clearly indicated, each aspect or embodiment defined herein may be combined with any other aspect or embodiment. In particular, any feature indicated as preferred or advantageous may be combined with any other feature indicated as preferred or advantageous.

[0070] The embodiments described in this specification are merely preferred embodiments of the present invention. These embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of the present invention. All technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation should be within the scope of the present invention.

Claims

1. A heating device for heating a regeneration stream that regenerates an adsorber, comprising a piping system, characterized in that, The heating device also includes a steam heater and an electric heater. The piping system includes a piping system and a piping regulation assembly. The piping regulation assembly is configured to switch the piping system between a first mode, a second mode, and a third mode. In the first mode, the piping system allows the regenerated stream to pass through the steam heater to reach the adsorber while prohibiting the regenerated stream from passing through the electric heater. In the second mode, the piping system allows the regenerated stream to pass through the electric heater to reach the adsorber while prohibiting the regenerated stream from passing through the steam heater. In the third mode, the piping system allows the regenerated stream to pass through both the steam heater and the electric heater to reach the adsorber.

2. The heating device as described in claim 1, characterized in that, The pipeline system includes a first pipeline and a second pipeline arranged in parallel and respectively equipped with the steam heater and the electric heater. The common inlet of the first pipeline and the second pipeline is connected to the gas source of the regeneration stream, and the common outlet leads to the adsorber. The piping system also includes an intermediate pipe connecting the first pipe and the second pipe; The pipeline regulating assembly includes a first control valve and a second control valve respectively disposed in the first pipeline and the second pipeline. The first control valve is disposed between the common inlet and the steam heater, and the second control valve is disposed between the common inlet and the electric heater. The pipeline regulating assembly further includes a first switching valve disposed on the first pipeline. The first switching valve is disposed between the first connection position and the common outlet. The first connection position is the position on the first pipeline that connects to the intermediate pipeline.

3. The heating device as described in claim 2, characterized in that, The first connection point is between the steam heater and the common outlet, and the second connection point on the second pipeline, which connects to the intermediate pipeline, is between the common inlet and the electric heater. The second control valve is located between the common inlet and the second connection position.

4. The heating device as described in claim 3, characterized in that, The piping system also includes an additional piping connected in parallel with the first piping and the second piping, the additional piping being equipped with an additional control valve; In the first mode, the second mode, and the third mode, the piping system enters a cold-blowing state by closing the first control valve and the second control valve and opening the additional control valve. In the cold-blowing state, the additional piping is the path through which the regenerated stream flows as a cold-blowing stream.

5. The heating device as described in claim 3, characterized in that, The pipeline regulating assembly further includes a second switching valve, which is disposed in the intermediate pipeline, or disposed between the first connection position on the first pipeline and the steam heater.

6. The heating device as described in claim 5, characterized in that, The pipeline regulating assembly further includes a third switching valve, which is disposed in the second pipeline and between the second connection position and the common outlet; The piping system switches to the first mode by opening the first and second switching valves and closing the third switching valve, switches to the second mode by closing the first and second switching valves and opening the third switching valve, and switches to the third mode by closing the first switching valve and opening the second and third switching valves.

7. The heating device as described in claim 6, characterized in that, The third switching valve is located between the electric heater and the common outlet.

8. The heating device as described in claim 7, characterized in that, The pipeline regulating assembly further includes a fourth switching valve, which is disposed in the second pipeline and located between the electric heater and the second connection position.

9. The heating device according to any one of claims 1 to 8, characterized in that, Each switch valve is a manual valve, and the pipeline system switches between different modes by manually opening and closing each switch valve; In any mode, the piping system switches between hot blowing and cold blowing states by opening and closing various control valves. In the hot blowing state, the regenerated stream enters the adsorber after being heated by the steam heater and / or the electric heater. In the cold blowing state, the regenerated stream directly enters the adsorber as a cold blowing stream.

10. A purification system for an air separation unit, comprising at least two adsorbers configured to alternately perform adsorption and regeneration operations, characterized in that, It also includes a heating device as claimed in any one of claims 1 to 9, wherein the common outlet of the first and second pipes of the piping system of the heating device is connected to the at least two adsorbers.

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