Gas separation and purification system and method with stable flushing and regeneration effect

Abstract

The present invention belongs to the technical field of industrial gas separation and purification, and specifically relates to a gas separation and purification system and method with stable flushing and regeneration effect. The gas separation and purification system of the present invention comprises a raw gas pipeline and a product gas pipeline, a plurality of adsorption pipelines are connected between the raw gas pipeline and the product gas pipeline, an adsorption tower is arranged on the adsorption pipeline, a discharge pipeline is connected between the plurality of adsorption pipelines, and a plurality of flushing and regeneration regulating systems are connected in parallel on the discharge pipeline; a discharge tank and a flushing regulating valve are arranged in sequence on the flushing and regeneration regulating pipeline, an odd-numbered flushing pipeline is connected between a plurality of odd-numbered adsorption pipelines, an even-numbered flushing pipeline is connected between a plurality of even-numbered adsorption pipelines, and the other end of the flushing and regeneration regulating pipeline is respectively connected to an odd-numbered flushing pipeline and an even-numbered flushing pipeline. The present invention provides a gas separation and purification system and method in which the effects of multiple staggered flushing and regeneration are consistent as a whole to ensure the overall operation effect of the device and the product yield.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial gas separation and purification, and in particular relates to a gas separation and purification system and method with stable flushing and regeneration effect. Background Art

[0002] Pressure Swing Adsorption (PSA) gas separation and purification technology utilizes the differences in adsorption characteristics such as equilibrium adsorption capacity and adsorption rate of gas components on adsorbents, as well as the characteristics of adsorption capacity changing with pressure, to achieve alternating adsorption and desorption processes through periodic pressure changes, thereby achieving gas separation or purification. It is a physical process that can be achieved at room temperature. Since the PSA system is composed of multiple adsorption towers and programmable valves with exactly the same configuration connected in parallel, its overall performance also follows the theory of the shortest board of the barrel. The performance of the entire system is determined by the worst performance of the parallel individuals, so it is required to maximize the consistency of each process in the system.

[0003] The patented flushing process of the pressure swing adsorption process with two downstream tanks (ZL 200510020305.X) uses two regulating valves after each downstream tank to control the flushing and regeneration process. See the operation sequence table 1 and Figure 7 Each flushing and regeneration step is controlled by two regulating valves to control different series of flushing and regeneration processes. The flushing and regeneration process will have different flushing and regeneration effects due to the performance differences of the regulating valves. At the same time, each regulating valve needs to set parameters separately due to different control schemes in the early, middle and late stages, which makes the control program configuration of the regulating valve very complicated. There is a large gap between the actual control effect and the theoretical design, which affects the flushing and regeneration cleanliness of the adsorbent and ultimately causes the flushing and regeneration effect to deviate from the design value.

[0004] Table 1: 10-2-5 / P PSA operation process table with two downstream tanks

[0005]

[0006]

[0007] When two regulating valves are used to control different series of flushing regeneration one processes, and two different regulating valves are used to control different series of flushing regeneration two processes in flushing regeneration two, each flushing regeneration process will have different regeneration effects due to the performance differences of the two regulating valves. In the four flushing processes controlled by four regulating valves in two series of the pressure swing adsorption process with two sequential release tanks, the product yield of the actual operation of the device can only be guaranteed when the flushing regeneration one and flushing regeneration two corresponding to the single and double series have the same effects. When the regeneration effect of any flushing regeneration process deviates due to the performance differences of the regulating valves, the yield cannot reach the optimal value, and the overall performance of the device will be greatly reduced. According to the analysis of the actual operating results, when the performance of the four regulating valves is inconsistent and the differences are large, the overall recovery rate of the device is reduced by about 0.5% compared with the design in the actual operating state. Summary of the invention

[0008] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a gas separation and purification system and method in which the effects of multiple staggered flushing and regeneration are consistent as a whole to ensure the overall operation effect of the device and the product yield.

[0009] The technical solution adopted by the present invention is:

[0010] A gas separation and purification system with stable flushing and regeneration effect comprises a raw gas pipeline and a product gas pipeline, a plurality of adsorption pipelines are connected between the raw gas pipeline and the product gas pipeline, an adsorption tower is arranged on the adsorption pipeline, a discharge pipeline is connected between the plurality of adsorption pipelines, and a plurality of flushing and regeneration regulating pipelines are connected in parallel on the discharge pipeline; a discharge tank and a flushing regulating valve are arranged in sequence on the flushing and regeneration regulating pipeline, an odd-numbered flushing pipeline is connected between a plurality of odd-numbered adsorption pipelines, an even-numbered flushing pipeline is connected between a plurality of even-numbered adsorption pipelines, and the other end of the flushing and regeneration regulating pipeline is respectively connected to the odd-numbered flushing pipeline and the even-numbered flushing pipeline.

[0011] During the flushing step, the flushing regeneration gas discharged from the sequential release step is used to flush the adsorbent in the adsorption tower that has completed the reverse pressure release step, and the residual impurities are completely regenerated from the adsorbent. The flushing regulating valve on the flushing regeneration regulating pipeline controls the speed of the sequential release tank, and then the odd flushing pipeline and the even flushing pipeline are switched to perform the flushing and regeneration process on the odd and even series adsorption towers that have completed the reverse pressure release step. Several sequential release tanks flush and regenerate the same adsorption tower in turn. Since the other ends of the flushing and regeneration regulating pipelines are respectively connected to the odd flushing pipeline and the even flushing pipeline, when a certain sequential release tank is used to flush the odd adsorption tower and the even adsorption tower respectively, the flushing regulating valve used is one, and the flushing effect of the sequential release tank on the odd and even adsorption towers is consistent, and the effect of multiple staggered flushing and regeneration is consistent as a whole, ensuring the overall operation effect of the device and the product yield.

[0012] As a preferred embodiment of the present invention, a raw gas program-controlled valve is provided on one end of the adsorption pipeline close to the raw gas pipeline, and a product gas program-controlled valve is provided on one end of the adsorption pipeline close to the product gas pipeline. When the adsorption step is performed, the raw gas program-controlled valve and the product gas program-controlled valve on the adsorption pipeline are opened, and the raw gas enters the adsorption tower from the bottom of the adsorption tower, and the impurity components in the raw gas are adsorbed by the adsorbent in the adsorption tower, and the weakly adsorbable components such as hydrogen are sent out of the boundary area from the product gas pipeline at the top of the adsorption tower. When the impurity components in the product gas meet the requirements, the raw gas program-controlled valve and the product gas program-controlled valve are closed.

[0013] As a preferred embodiment of the present invention, a plurality of pressure-equalizing pipelines are further connected between the plurality of adsorption pipelines, and a pressure-equalizing program-controlled valve is provided between the pressure-equalizing pipeline and the adsorption pipeline. After the adsorption step is completed, the pressure-equalizing program-controlled valve is opened to transfer the adsorbent voids in the adsorption tower and the product gas components adsorbed by the adsorbent and the adsorption heat to the adsorption tower with pressure rise. After the pressure of the adsorption tower with pressure rise is substantially equal to that of the adsorption tower with pressure drop, the pressure-equalizing program-controlled valve is closed. Depending on the adsorption pressure, number of adsorption towers, adsorbent performance, product quality and yield requirements, the pressure drop is completed in several times.

[0014] As a preferred solution of the present invention, a dedicated program-controlled valve for downstream discharge is connected between the downstream discharge pipeline and the adsorption pipeline, and a common program-controlled valve for downstream discharge is provided on the flushing and regeneration regulating pipeline. The dedicated program-controlled valve for downstream discharge is located on the side of the downstream discharge tank away from the flushing and regeneration regulating valve. After the pressure drop step is completed, a small amount of effective components adsorbed by the adsorbent gap and the adsorbent in the adsorption tower can be further released from the bed layer through the downstream discharge step of the forward pressure reduction and used as flushing and regeneration gas. It enters the downstream discharge tank through the dedicated program-controlled valve for downstream discharge and the common program-controlled valve for downstream discharge and is stored.

[0015] As a preferred embodiment of the present invention, an odd-numbered flushing special program-controlled valve is connected between the odd-numbered flushing pipeline and the odd-numbered adsorption pipeline, an even-numbered flushing special program-controlled valve is connected between the even-numbered flushing pipeline and the even-numbered adsorption pipeline, an odd-numbered flushing common program-controlled valve is provided at one end of the flushing and regeneration regulating pipeline connected to the odd-numbered flushing pipeline, and an even-numbered flushing common program-controlled valve is provided at one end of the flushing and regeneration regulating pipeline connected to the even-numbered flushing pipeline. In order to regenerate the adsorbent in the adsorption tower more thoroughly, the flushing and regeneration gas discharged from the forward release step is used to flush the adsorbent in the adsorption tower that has completed the reverse pressure release step, and the residual impurities are completely regenerated from the adsorbent. The flushing regulating valve in the flushing and regeneration regulating pipeline controls the speed of the forward release gas in the forward release tank, and the odd-numbered flushing common program-controlled valve and the even-numbered flushing common program-controlled valve are switched to flush and regenerate the odd and even series adsorption towers that have completed the reverse pressure release step.

[0016] As a preferred embodiment of the present invention, a plurality of desorption pipelines are also included, and a desorption program-controlled valve is connected between the desorption pipeline and the plurality of adsorption pipelines. After the discharge step is completed, the impurities and part of the effective gas in the adsorption tower are discharged through the desorption program-controlled valve at the bottom of the adsorption tower. During the flushing step, the impurities remaining in the adsorption tank are completely regenerated from the adsorbent through the desorption pipeline.

[0017] As a preferred embodiment of the present invention, a final boosting pipeline is also connected between several of the adsorption pipelines, a final boosting dedicated program-controlled valve is connected between the final boosting pipeline and the adsorption pipeline, the final boosting pipeline is connected to the product gas pipeline, and a product gas regulating valve is connected between the final boosting pipeline and the product gas pipeline. Since the pressure of the adsorption tower cannot reach the adsorption pressure through multiple pressure-raising steps, it is necessary to use product gas to boost the pressure from the top of the adsorption tower to reach the adsorption operating pressure. According to different processes, the adsorption tower can also be boosted with raw gas from the bed feed end, or the adsorption tower can be finally boosted with product gas and raw gas at the same time until the adsorption tower reaches the adsorption operating pressure. Finally, the adsorption tower enters the next cycle according to the operating procedure. When the adsorption tower is finally boosted, the product gas regulating valve and the corresponding final boosting dedicated program-controlled valve on the final boosting pipeline are opened to allow the product gas to enter the adsorption tower and achieve the final boost.

[0018] A gas separation and purification method with stable flushing and regeneration effect comprises the following steps:

[0019] S1: The raw gas is sent into the adsorption pipeline for separation and purification, and the product gas is sent out of the boundary area;

[0020] S2: transferring the adsorbent voids in the adsorption tower, the product gas components adsorbed by the adsorbent, and the adsorption heat to the adsorption tower with increased pressure until the pressure of the adsorption tower with decreased pressure is equal to that of the adsorption tower with increased pressure;

[0021] S3: discharge the small amount of effective components in the adsorbent voids in the adsorption tower and adsorbed by the adsorbent into a storage tank for storage;

[0022] S4: Reverse the impurities and part of the effective gas in the adsorption tower;

[0023] S5: flushing the adsorbent in the adsorption tower that has completed step S4 with the flushing regeneration gas discharged in step S3; wherein, when a single sequential discharge tank flushes an odd-numbered adsorption tower and an even-numbered adsorption tower, the same flushing regulating valve is used to adjust the flow rate;

[0024] S6: using the gas from the adsorption tower in step S2 to increase the pressure of the adsorption tower in step S5, until the pressure of the adsorption tower with increased pressure is equal to that of the adsorption tower with decreased pressure;

[0025] S7: Use the product gas to finally increase the pressure from the top of the adsorption tower to reach the adsorption operating pressure.

[0026] The system of the present invention has six or more adsorption towers, at least two forward release tanks and at least two flushing regeneration adjustment modules and tail gas systems to form a multi-tower continuous operation PSA system. Each adsorption tower completes the same sequence of steps, but the process steps are staggered by one sub-cycle to ensure that the separation process is carried out continuously. The adsorption tower after the adsorption step performs several pressure drop steps, so as to make full use of the residual pressure, so that the adsorption tower after the reverse release can be gradually pressurized, and the adsorption tank after the pressure increase has a good adsorption effect again. After the pressure drop step is completed, the adsorbent gap in the adsorption tower and the small amount of effective components adsorbed by the adsorbent can be further released from the bed layer through the forward release step of the forward pressure reduction as flushing regeneration gas. After the forward release step is completed, the impurities and part of the effective gas in the adsorption tower are discharged through the desorption program-controlled valve at the bottom of the adsorption tower. In order to make the adsorbent in the adsorption tower regenerated more thoroughly, the flushing regeneration gas discharged from the forward release step is used to flush the adsorbent in the adsorption tower that has completed the reverse pressure release step, and the residual impurities are completely regenerated from the adsorbent. Since the pressure of the adsorption tower cannot reach the adsorption pressure through multiple pressure-raising steps, it is necessary to use product gas to raise the pressure from the top of the adsorption tower to reach the adsorption operating pressure.

[0027] As a preferred embodiment of the present invention, in step S2 and step S5, the final boosting pipeline for final boosting in step S7 is used when the adsorption tower with the first pressure drop and the adsorption tower with the last pressure increase are pressure-equalized. The final boosting program-controlled valve at the corresponding position of the final boosting pipeline is opened, and the final boosting regulating valve is adjusted to a certain small opening. When the adsorption tower with the first pressure drop and the adsorption tower with the last pressure increase are pressure-equalized, the difference between the adsorption tower pressure and the product gas pressure can be reduced to shorten the time for final boosting.

[0028] As a preferred embodiment of the present invention, in step S1, the raw gas enters the adsorption pipeline at 0.6-6.0 MPa and 10-60°C.

[0029] The beneficial effects of the present invention are:

[0030] The flushing regulating valve on the flushing and regeneration regulating pipeline of the present invention can control the speed of the gas discharge of the downstream tank, and then switch the odd flushing pipeline and the even flushing pipeline to perform the flushing and regeneration process on the odd and even series adsorption towers that have completed the reverse pressure release step. Since the other end of the flushing and regeneration regulating pipeline is respectively connected to the odd flushing pipeline and the even flushing pipeline, when a certain downstream tank is used to flush the odd adsorption tower and the even adsorption tower respectively, the flushing regulating valve used is one, and the flushing effect of the downstream tank on the odd and even adsorption towers is consistent, and the effect of multiple staggered flushing and regeneration is consistent as a whole, which ensures the overall operation effect of the device and the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is a schematic diagram of the structure of the present invention in Example 1;

[0032] Figure 2 It is a schematic diagram of the structure of the present invention in Example 2;

[0033] Figure 3 is a schematic diagram of the structure of the present invention in Example 3;

[0034] Figure 4 is a schematic diagram of the structure of the present invention in Example 4;

[0035] Figure 5 is a schematic diagram of the structure of the present invention in Example 5;

[0036] Figure 6 is a schematic diagram of the structure of the present invention in Example 6;

[0037] Figure 7 It is a structural schematic diagram of an existing gas separation and purification system.

[0038] In the figure, 1-raw gas pipeline; 2-product gas pipeline; 3-adsorption pipeline; 4-release pipeline; 5-flushing regeneration adjustment pipeline; 6-odd flushing pipeline; 7-even flushing pipeline; 8-equalizing pipeline; 9-desorption pipeline; 10-final boosting pipeline; 31-raw gas program-controlled valve; 32-product gas program-controlled valve; 41-special program-controlled valve for release; 61-odd flushing special program-controlled valve; 71-even flushing special program-controlled valve; 81- Equalizing pressure program-controlled valve; 91-desorption program-controlled valve; 101-final boost special program-controlled valve; 102-product gas regulating valve; HV-101, HV-102, HV-103-flushing regulating valve; KV-1, KV-2, KV-3-sequential release public program-controlled valve; KV-1A, KV-2A, KV-3A-odd number flushing public program-controlled valve; KV-1B, KV-2B, KV-3B-even number flushing public program-controlled valve. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0040] Example 1: Separation and purification process with 3 sequential release tanks and 10 adsorption towers

[0041] Table 2: 10-2-5 / P operation process table

[0042]

[0043] From the operation process table 2 of this example, it can be known that each adsorption tower undergoes adsorption A, the first pressure drop E1D, the second pressure drop E2D, the third pressure drop E3D, the fourth pressure drop E4D, the fifth pressure drop E5D, forward release PP1, forward release PP2, forward release PP3, reverse release D, flushing three P3, flushing two P2, flushing one P1, the fifth pressure rise E5R, the fourth pressure rise E4R, the third pressure rise E3R, the second pressure rise E2R, the first pressure rise E1R and the final pressure rise FR in one cycle, and the remaining adsorption towers also undergo the same process, but they are staggered in time by one sub-cycle.

[0044] like Figure 1 As shown, the adsorption towers T101, T103, T105, T107 and T109 with odd numbers form a single series, and the adsorption towers T102, T104, T106, T108 and T110 with even numbers form a double series.

[0045] Three downstream tanks V101, V102, and V103 are set up, and a downstream common program-controlled valve KV-1, KV-2, and KV-3 are set up on the downstream pipeline 4. The flushing and regeneration regulating module mainly includes the flushing regulating valves HV-101, HV-102, and HV-103 respectively set up on the downstream tank outlet main pipe. The odd-numbered flushing common program-controlled valves KV-1A, KV-2A, and KV-3A and the even-numbered flushing common program-controlled valves KV-1B, KV-2B, and KV-3B are respectively set up on the flushing inlet main pipe in odd and even series. The downstream common program-controlled valve KV-1 is connected to the downstream tank V101, and the flushing regulating module A is composed of the flushing regulating valve HV-101 and two common program-controlled valves KV-1A / B. The common program-controlled valve KV-2 for the discharge is connected to the discharge tank V102, and the flushing control module B is composed of the flushing control valve HV-102 and two common program-controlled valves KV-2A / B. The common program-controlled valve KV-3 for the discharge is connected to the discharge tank V103, and the flushing control module C is composed of the flushing control valve HV-103 and two common program-controlled valves KV-3A / B.

[0046] The specific process is as follows:

[0047] Adsorption step A: open the raw gas program-controlled valve 31 and the product gas program-controlled valve 32. The raw gas enters the adsorption tower from the bottom of the adsorption tower through the raw gas pipeline 1 and the raw gas program-controlled valve 31 at 2.0-4.0 MPa and 20-40°C. The impurity components in the raw gas are adsorbed by the adsorbent in the adsorption tower, and the weakly adsorbable components such as hydrogen are sent out of the boundary area from the upper part of the adsorption tower through the pipeline and the product gas program-controlled valve 32. When the impurity components in the product gas meet the requirements, close the raw gas program-controlled valve 31 and the product gas program-controlled valve 32, and the adsorption step ends.

[0048] Pressure drop EiD step: After the adsorption step A is completed, the pressure equalization program-controlled valve 81 for equalization is opened to transfer the adsorbent voids in the adsorption tower, the product gas components adsorbed by the adsorbent, and the adsorption heat to the adsorption tower with pressure increase. After the pressure of the pressure increase and the pressure drop adsorption tower are basically equal, the pressure equalization program-controlled valve 81 is closed. According to the adsorption pressure, the number of adsorption towers, the adsorbent performance, the product quality and yield requirements, etc., the pressure drop is completed in 5 steps, which are abbreviated as E1D, E2D, ... E5D in turn. In particular, when the adsorption tower with the first pressure drop and the adsorption tower with the last pressure increase are equalized, the final boost program-controlled valve at the corresponding position of the final boost pipeline 10 is opened, and the final boost regulating valve is adjusted to a certain small opening.

[0049] PP1 / 2 / 3 steps: After the pressure reduction step EiD is completed, the small amount of effective components adsorbed by the adsorbent in the adsorption tower can be further released from the bed layer through the PP1 / 2 / 3 steps of the forward pressure reduction as flushing regeneration gas. PP1 enters the V101 discharge tank 1 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-1 for storage, PP2 enters the V102 discharge tank 2 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-2 for storage, and PP3 enters the V103 discharge tank 2 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-3 for storage.

[0050] Reverse pressure release step D: After the sequential release steps PP1 / 2 / 3 are completed, the desorption program-controlled valve 91 is opened, and the impurities and part of the effective gas in the adsorption tower are discharged through the desorption program-controlled valve 91 at the bottom of the adsorption tower. After the reverse pressure release is completed, the pressure in the adsorption tower is 0.002~0.45MPaG.

[0051] Flushing P3 / 2 / 1 step: In order to regenerate the adsorbent in the adsorption tower more thoroughly, the flushing regeneration gas discharged from the PP1 / 2 / 3 step is used to flush the adsorbent in the adsorption tower that has completed the reverse pressure release step D, and the residual impurities are completely regenerated from the adsorbent. First, the regulating valve HV103 in the flushing regeneration regulating module C controls the speed of the gas discharge in the V103 discharge tank three, and the two flushing common program-controlled valves KV-3A / B are switched to perform the first flushing regeneration P3 process on the single and double series adsorption towers that have completed the reverse pressure release step D. Then, the regulating valve HV102 in the flushing regeneration regulating module B controls the speed of the gas discharge in the V102 discharge tank two, and the two flushing common program-controlled valves KV-2A / B are switched to perform the second flushing regeneration P2 process on the single and double series adsorption towers that have completed the first flushing P3 step. Finally, the regulating valve HV101 in the flushing and regeneration regulating module A controls the speed of the gas discharge in the V101 discharge tank 1, and the single and double series adsorption towers that have completed the second flushing and regeneration P2 process are switched through two flushing common programmable valves KV-1A / B to carry out the third flushing and regeneration P1 process. During the flushing process, the pressure in the flushed adsorption tower drops to 0.001~0.40MPaG.

[0052] Pressure increase EiR step: This step corresponds to the pressure reduction EiD step. After the flushing P3 / 2 / 1 step is completed, the pressure equalizing programmable valve 81 is opened, and the gas from the pressure reduction EiD step is used to gradually increase the pressure of the adsorption tower that has completed the flushing P3 / 2 / 1 step. This step can be completed in 5 times, which are abbreviated as E5R, ... E2R, and E1R respectively.

[0053] Final pressure-raising FR step: Since the pressure of the adsorption tower cannot reach the adsorption pressure through multiple pressure-raising EiR steps, it is necessary to use product gas to increase the pressure from the top of the adsorption tower to reach the adsorption operating pressure. According to different processes, the adsorption tower can also be pressurized from the feed end of the bed with raw gas, or the adsorption tower can be finally pressurized with product gas and raw gas at the same time until the adsorption tower reaches the adsorption operating pressure, and finally the adsorption tower enters the next cycle according to the operation procedure.

[0054] Each adsorption tower goes through the same sequence of steps, but the process steps are staggered by one sub-cycle to ensure the separation process is continuous.

[0055] Example 2: Separation and purification process with 2 sequential release tanks and 12 adsorption towers

[0056] Table 3: 12-2-6 / P operation process table

[0057]

[0058] From the operation process table 3 of this example, it can be known that each adsorption tower undergoes adsorption A, the first pressure drop E1D, the second pressure drop E2D, the third pressure drop E3D, the fourth pressure drop E4D, the fifth pressure drop E5D, the sixth pressure drop E6D, forward release PP1, forward release PP2, reverse release D, flushing two P2, flushing one P1, the sixth pressure rise E6R, the fifth pressure rise E5R, the fourth pressure rise E4R, the third pressure rise E3R, the second pressure rise E2R, the first pressure rise E1R and the final pressure rise FR in one cycle, and the remaining adsorption towers also undergo the same process, but they are staggered in time by one sub-cycle.

[0059] like Figure 2 As shown, the adsorption towers T101, T103, T105, T107, T109 and T1011 with odd numbers constitute a single series, and the adsorption towers T102, T104, T106, T108, T110 and T112 with even numbers constitute a double series.

[0060] Two downstream tanks V101 and V102 are set up, and a downstream common program-controlled valve KV-1 and KV-2 are respectively set up on the downstream pipeline 4. The flushing and regeneration regulating module mainly includes regulating valves HV-101 and HV-102 respectively set up on the downstream tank outlet main pipe, and odd-number flushing common program-controlled valves KV-1A and KV-2A and even-number flushing common program-controlled valves KV-1B and KV-2B respectively set up in the single and double series on the flushing inlet main pipe. The downstream common program-controlled valve KV-1 is connected to the downstream tank V101, and the flushing regulating module A is composed of the flushing regulating valve HV-101 and two common program-controlled valves KV-1A / B. The flushing regulating module B is composed of the flushing regulating valve HV-102 and two common program-controlled valves KV-2A / B.

[0061] The specific process is as follows:

[0062] Adsorption step A: open the raw gas program-controlled valve 31 and the product gas program-controlled valve 32, and the raw gas enters the adsorption tower from the bottom of the adsorption tower through the raw gas pipeline 1 and the raw gas program-controlled valve 31 at 2.0-4.0 MPa and 20-40°C. The impurity components in the raw gas are adsorbed by the adsorbent in the adsorption tower, and the weakly adsorbable components such as hydrogen are sent out of the boundary area from the upper part of the adsorption tower through the pipeline and the product gas program-controlled valve 32. When the impurity components in the product gas meet the requirements, close the raw gas program-controlled valve 31 and the product gas program-controlled valve 32, and the adsorption step ends.

[0063] Pressure drop EiD step: After the adsorption step A is completed, the pressure equalization program-controlled valve 81 for equalization is opened to transfer the adsorbent voids in the adsorption tower, the product gas components adsorbed by the adsorbent, and the adsorption heat to the adsorption tower with pressure rise. After the pressure rise and the pressure of the pressure drop adsorption tower are basically equal, the pressure equalization program-controlled valve 81 is closed. According to the adsorption pressure, the number of adsorption towers, the adsorbent performance, the product quality and the yield requirements, the pressure drop is completed in 6 steps, which are abbreviated as E1D, E2D, ... E6D in turn. In particular, when the adsorption tower with the first pressure drop and the adsorption tower with the last pressure rise are equalized, the final boost program-controlled valve at the corresponding position of the final boost pipeline 10 is opened, and the final boost regulating valve is adjusted to a certain small opening. When there is no adsorption tank for the sequential release step, the sequential release pipeline 4 is used as a pipeline for equalization.

[0064] PP1 / 2 step: After the pressure drop step E5D is completed, the small amount of effective components adsorbed by the adsorbent in the adsorption tower can be further released from the bed layer through the PP1 / 2 step of forward pressure reduction as flushing regeneration gas. PP1 enters V101 discharge tank 1 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-1 for storage. PP2 enters V102 discharge tank 2 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-2 for storage.

[0065] Reverse pressure release step D: After the forward pressure release step PP1 / 2 is completed, the desorption program-controlled valve 91 is opened, and the impurities and part of the effective gas in the adsorption tower are discharged through the desorption program-controlled valve 91 at the bottom of the adsorption tower. After the reverse pressure release is completed, the pressure in the adsorption tower is 0.002~0.45MPaG.

[0066] Flushing P2 / 1 step: In order to make the adsorbent in the adsorption tower regenerated more thoroughly, the flushing regeneration gas discharged from the PP1 / 2 step is used to flush the adsorbent in the adsorption tower that has completed the reverse pressure release step D, and the residual impurities are completely regenerated from the adsorbent. First, the regulating valve HV102 in the flushing regeneration regulating module B controls the speed of the gas discharge in the V102 discharge tank 2, and the two program-controlled valves KV-2A / B are switched to perform the first flushing regeneration P2 process on the single and double series adsorption towers that have completed the reverse pressure release step D. Then, the regulating valve HV101 in the flushing regeneration regulating module A controls the speed of the gas discharge in the V101 discharge tank 1, and the two program-controlled valves KV-1A / B are switched to perform the second flushing regeneration P1 process on the single and double series adsorption towers that have completed the first flushing regeneration P2 process. During the flushing process, the pressure in the flushed adsorption tower drops to 0.001~0.40MPaG.

[0067] Pressure increase EiR step: This step corresponds to the pressure reduction EiD step. After the flushing P2 / 1 step is completed, the gas of the pressure reduction EiD step is used to gradually increase the pressure of the adsorption tower that has completed the flushing P2 / 1 step. This step can be completed in 6 times, which are abbreviated as E6R, ... E2R, E1R respectively.

[0068] Final pressure-raising FR step: Since the pressure of the adsorption tower cannot reach the adsorption pressure through multiple pressure-raising EiR steps, it is necessary to use product gas to increase the pressure from the top of the adsorption tower to reach the adsorption operating pressure. According to different processes, the adsorption tower can also be pressurized from the feed end of the bed with raw gas, or the adsorption tower can be finally pressurized with product gas and raw gas at the same time until the adsorption tower reaches the adsorption operating pressure, and finally the adsorption tower enters the next cycle according to the operation procedure.

[0069] Each adsorption tower goes through the same sequence of steps, but the process steps are staggered by one sub-cycle to ensure the separation process is continuous.

[0070] Example 3: Separation and purification process with 2 sequential release tanks and 14 adsorption towers

[0071] Table 4: 14-2-8 / P operation process table

[0072]

[0073]

[0074] From the operation process table 4 of this example, it can be known that each adsorption tower undergoes adsorption A, the first pressure drop E1D, the second pressure drop E2D, the third pressure drop E3D, the fourth pressure drop E4D, the fifth pressure drop E5D, the sixth pressure drop E6D, the seventh pressure drop E7D, the eighth pressure drop E8D, sequential release PP1, sequential release PP2, reverse release D, flushing 2 P2, flushing 1 P1, the eighth pressure rise E8R, the seventh pressure rise E7R, the sixth pressure rise E6R, the fifth pressure rise E5R, the fourth pressure rise E4R, the third pressure rise E3R, the second pressure rise E2R, the first pressure rise E1R and the final pressure rise FR in one cycle. The remaining adsorption towers also undergo the same process, but they are staggered by one sub-cycle in time.

[0075] like Figure 3 As shown, the adsorption towers T101, T103, T105, T107, T109, T111 and T113 with odd numbers form a single series, and the adsorption towers T102, T104, T106, T108, T110, T112 and T114 with even numbers form a double series.

[0076] Two downstream tanks V101 and V102 are set up, and a downstream common program-controlled valve KV-1 and KV-2 are respectively set up on the downstream pipeline 4. The flushing and regeneration regulating module mainly includes regulating valves HV-101 and HV-102 respectively set up on the downstream tank outlet main pipe, and odd-number flushing common program-controlled valves KV-1A and KV-2A and even-number flushing common program-controlled valves KV-1B and KV-2B respectively set up on the flushing inlet main pipe in odd and even series. The downstream common program-controlled valve KV-1 is connected to the downstream tank V101. The flushing regulating module A consists of the flushing regulating valve HV-101 and two common program-controlled valves KV-1A / B. The flushing regulating module B consists of the flushing regulating valve HV-102 and two common program-controlled valves KV-2A / B.

[0077] The specific process is as follows:

[0078] Adsorption step A: open the raw gas program-controlled valve 31 and the product gas program-controlled valve 32, and the raw gas enters the adsorption tower from the bottom of the adsorption tower through the raw gas pipeline 1 and the raw gas program-controlled valve 31 at 4.0-6.0 MPa and 20-40°C. The impurity components in the raw gas are adsorbed by the adsorbent in the adsorption tower, and the weakly adsorbable components such as hydrogen are sent out of the boundary area from the upper part of the adsorption tower through the pipeline and the product gas program-controlled valve 32. When the impurity components in the product gas meet the requirements, close the raw gas program-controlled valve 31 and the product gas program-controlled valve 32, and the adsorption step ends.

[0079] Pressure drop EiD step: After the adsorption step A is completed, the pressure equalization program-controlled valve 81 for equalization is opened to transfer the adsorbent voids in the tower, the product gas components adsorbed by the adsorbent, and the adsorption heat to the adsorption tower with pressure rise. After the pressure rise is substantially equal to the pressure of the pressure drop adsorption tower, the pressure equalization program-controlled valve 81 is closed. According to the adsorption pressure, the number of adsorption towers, the adsorbent performance, the product quality and the yield requirements, the pressure drop is completed in 8 steps, which are abbreviated as E1D, E2D, ... E8D in turn. In particular, when the adsorption tower with the first pressure drop and the adsorption tower with the last pressure rise are pressure-equalized, the final pressure-equalization program-controlled valve at the corresponding position of the final boosting pipeline 10 is opened, and the final boosting regulating valve is adjusted to a determined small opening. When there is no adsorption tank for the sequential release step, the sequential release pipeline 4 is used as a pipeline for equalization.

[0080] PP1 / 2 step: After the pressure reduction step EiD is completed, the small amount of effective components adsorbed by the adsorbent in the adsorption tower can be further released from the bed layer through the PP1 / 2 step of forward pressure reduction as flushing regeneration gas. PP1 enters V101 discharge tank 1 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-1 for storage, and PP2 enters V102 discharge tank 2 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-2 for storage.

[0081] Reverse pressure release step D: After the forward pressure release step PP1 / 2 is completed, the impurities and part of the effective gas in the adsorption tower are discharged through the desorption program-controlled valve 91 at the bottom of the adsorption tower. After the reverse pressure release is completed, the pressure in the adsorption tower is 0.002~0.450MPaG.

[0082] Flushing P2 / 1 step: In order to make the adsorbent in the adsorption tower regenerated more thoroughly, the flushing regeneration gas discharged from the PP1 / 2 step is used to flush the adsorbent in the adsorption tower that has completed the reverse pressure release step D, and the residual impurities are completely regenerated from the adsorbent. First, the regulating valve HV102 in the flushing regeneration regulating module B controls the speed of the gas discharge in the V102 discharge tank 2, and the two program-controlled valves KV-2A / B are switched to perform the first flushing regeneration P2 process on the single and double series adsorption towers that have completed the reverse pressure release step D. Then, the regulating valve HV101 in the flushing regeneration regulating module A controls the speed of the gas discharge in the V101 discharge tank 1, and the two program-controlled valves KV-1A / B are switched to perform the second flushing regeneration P1 process on the single and double series adsorption towers that have completed the first flushing regeneration P2 process. During the flushing process, the pressure in the flushed adsorption tower drops to 0.001~0.40MPaG.

[0083] Pressure increase EiR step: This step corresponds to the pressure reduction EiD step. After the flushing P2 / 1 step is completed, the gas of the pressure reduction EiD step is used to gradually increase the pressure of the adsorption tower that has completed the flushing P2 / 1 step. This step can be completed in 8 times, which are abbreviated as E8R, ... E2R, E1R respectively.

[0084] Final pressure-raising FR step: Since the pressure of the adsorption tower cannot reach the adsorption pressure through multiple pressure-raising EiR steps, it is necessary to use product gas to increase the pressure from the top of the adsorption tower to reach the adsorption operating pressure. According to different processes, the adsorption tower can also be pressurized from the feed end of the bed with raw gas, or the adsorption tower can be finally pressurized with product gas and raw gas at the same time until the adsorption tower reaches the adsorption operating pressure, and finally the adsorption tower enters the next cycle according to the operation procedure.

[0085] Each adsorption tower goes through the same sequence of steps, but the process steps are staggered by one sub-cycle to ensure the separation process is continuous.

[0086] Example 4: Separation and purification process with 2 sequential tanks and 8 adsorption towers

[0087] Table 5: 8-1-4 / P operation process table

[0088]

[0089] From the operation process table 5 of this example, it can be known that each adsorption tower undergoes adsorption A, the first pressure drop E1D, the second pressure drop E2D, the third pressure drop E3D, the fourth pressure drop E4D, forward release PP1, forward release PP2, reverse release D, flushing two P2, flushing one P1, the fourth pressure rise E4R, the third pressure rise E3R, the second pressure rise E2R, the first pressure rise E1R and the final pressure rise FR in one cycle, and the remaining adsorption towers also undergo the same process, but they are staggered in time by one sub-cycle.

[0090] like Figure 4 As shown, the adsorption towers T101, T103, T105 and T107 with odd numbers constitute a single series, and the adsorption towers T102, T104, T106 and T108 with even numbers constitute a double series.

[0091] Two downstream tanks V101 and V102 are set up, and a downstream common program-controlled valve KV-1 and KV-2 are set up on the downstream pipeline 4. The flushing and regeneration regulating module mainly includes regulating valves HV-101 and HV-102 respectively set up on the downstream tank outlet main pipe, and odd-number flushing common program-controlled valves KV-1A and KV-2A and even-number flushing common program-controlled valves KV-1B and KV-2B respectively set up on the flushing inlet main pipe. The downstream common program-controlled valve KV-1 is connected to the downstream tank V101. The flushing regulating module A is composed of the flushing regulating valve HV-101 and two common program-controlled valves KV-1A / B, and the flushing regulating module B is composed of the flushing regulating valve HV-102 and two common program-controlled valves KV-2A / B.

[0092] The specific process is as follows:

[0093] Adsorption step A: open the raw gas programmable valve 31 and the product gas programmable valve 32, and the raw gas enters the adsorption tower from the bottom of the adsorption tower through the raw gas pipeline 1 and the raw gas programmable valve 31 at 2.0-4.0 MPa and 20-40°C. The impurity components in the raw gas are adsorbed by the adsorbent in the adsorption tower, and the weakly adsorbable components such as hydrogen are sent out of the boundary area from the upper part of the adsorption tower through the pipeline and the product gas programmable valve 32. When the impurity components in the product gas meet the requirements, close the raw gas and product gas programmable valves 32, and the adsorption step ends.

[0094] Pressure drop EiD step: After the adsorption step A is completed, the pressure equalization program-controlled valve 81 for equalization is opened to transfer the adsorbent voids in the tower, the product gas components adsorbed by the adsorbent, and the adsorption heat to the adsorption tower with pressure rise. After the pressure rise is substantially equal to the pressure of the pressure drop adsorption tower, the pressure equalization program-controlled valve 81 is closed. According to the adsorption pressure, the number of adsorption towers, the adsorbent performance, the product quality and the yield requirements, the pressure drop is completed in 4 steps, which are abbreviated as E1D, E2D, ... E4D in turn. In particular, when the adsorption tower with the first pressure drop and the adsorption tower with the last pressure rise are pressure-equalized, the final pressure-equalizing program-controlled valve at the corresponding position of the final boosting pipeline 10 is opened, and the final boosting regulating valve is adjusted to a determined small opening. When there is no adsorption tank for the sequential release step, the sequential release pipeline 4 is used as a pressure-equalizing pipeline.

[0095] PP1 / 2 step: After the pressure reduction step E4D is completed, the small amount of effective components adsorbed by the adsorbent in the adsorption tower can be further released from the bed layer through the PP1 / 2 step of forward pressure reduction as flushing regeneration gas. PP1 enters V101 discharge tank 1 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-1 for storage, and PP2 enters V102 discharge tank 2 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-2 for storage.

[0096] Reverse pressure release step D: After the forward pressure release step PP1 / 2 is completed, the impurities and part of the effective gas in the adsorption tower are discharged through the desorption program-controlled valve 91 at the bottom of the adsorption tower. After the reverse pressure release is completed, the pressure in the adsorption tower is 0.002-0.45MPaG.

[0097] Flushing P2 / 1 step: In order to make the adsorbent in the adsorption tower regenerated more thoroughly, the flushing regeneration gas discharged from the PP1 / 2 step is used to flush the adsorbent in the adsorption tower that has completed the reverse pressure release step D, and the residual impurities are completely regenerated from the adsorbent. First, the regulating valve HV102 in the flushing regeneration regulating module B controls the speed of the gas discharge in the V102 discharge tank 2, and the two program-controlled valves KV-2A / B are switched to perform the first flushing regeneration P2 process on the single and double series adsorption towers that have completed the reverse pressure release step D. Then, the regulating valve HV101 in the flushing regeneration regulating module A controls the speed of the gas discharge in the V101 discharge tank 1, and the two program-controlled valves KV-1A / B are switched to perform the second flushing regeneration P1 process on the single and double series adsorption towers that have completed the first flushing regeneration P2 process. During the flushing process, the pressure in the flushed adsorption tower drops to 0.001~0.40MPaG.

[0098] Pressure increase EiR step: This step corresponds to the pressure reduction EiD step. After the flushing P2 / 1 step is completed, the gas of the pressure reduction EiD step is used to gradually increase the pressure of the adsorption tower that has completed the flushing P2 / 1 step. This step can be completed in 4 times, which are abbreviated as E4R, ... E2R, and E1R respectively.

[0099] Final pressure-raising FR step: Since the pressure of the adsorption tower cannot reach the adsorption pressure through multiple pressure-raising EiR steps, it is necessary to use product gas to increase the pressure from the top of the adsorption tower to reach the adsorption operating pressure. According to different processes, the adsorption tower can also be pressurized from the feed end of the bed with raw gas, or the adsorption tower can be finally pressurized with product gas and raw gas at the same time until the adsorption tower reaches the adsorption operating pressure, and finally the adsorption tower enters the next cycle according to the operation procedure.

[0100] Each adsorption tower goes through the same sequence of steps, but the process steps are staggered by one sub-cycle to ensure the separation process is continuous.

[0101] Implementation Case 5: Separation and purification process with 2 sequential tanks and 10 adsorption towers

[0102] Table 6: 10-2-4 / P operation process table

[0103]

[0104] From the operation process table 6 of this example, it can be known that each adsorption tower undergoes adsorption A, the first pressure drop E1D, the second pressure drop E2D, the third pressure drop E3D, the fourth pressure drop E4D, forward release PP1, forward release PP2, reverse release D, flushing two P2, flushing one P1, the fourth pressure rise E4R, the third pressure rise E3R, the second pressure rise E2R, the first pressure rise E1R and the final pressure rise FR in one cycle, and the remaining adsorption towers also undergo the same process, but they are staggered in time by one sub-cycle.

[0105] like Figure 5 As shown, the adsorption towers T101, T103, T105, T107 and T109 with odd numbers form a single series, and the adsorption towers T102, T104, T106, T108 and T110 with even numbers form a double series.

[0106] Two downstream tanks V101 and V102 are set up, and a downstream common program-controlled valve KV-1 and KV-2 are respectively set up on the downstream pipeline 4. The flushing and regeneration regulating module mainly includes regulating valves HV-101 and HV-102 respectively set up on the downstream tank outlet main pipe, and odd-number flushing common program-controlled valves KV-1A and KV-2A and even-number flushing common program-controlled valves KV-1B and KV-2B respectively set up on the flushing inlet main pipe in odd and even series. The downstream common program-controlled valve KV-1 is connected to the downstream tank V101, and the flushing regulating module A is composed of the flushing regulating valve HV-101 and two common program-controlled valves KV-1A / B. The downstream common program-controlled valve KV-2 is connected to the downstream tank V102, and the flushing regulating module B is composed of the flushing regulating valve HV-102 and two common program-controlled valves KV-2A / B.

[0107] The specific process is as follows:

[0108] Adsorption step A: open the raw gas programmable valve 31 and the product gas programmable valve 32, and the raw gas enters the adsorption tower from the bottom of the adsorption tower through the raw gas pipeline 1 and the raw gas programmable valve 31 at 2.0-4.0 MPa and 20-40°C. The impurity components in the raw gas are adsorbed by the adsorbent in the adsorption tower, and the weakly adsorbable components such as hydrogen are sent out of the boundary area from the upper part of the adsorption tower through the pipeline and the product gas programmable valve 32. When the impurity components in the product gas meet the requirements, close the raw gas and product gas programmable valves 32, and the adsorption step ends.

[0109] Pressure drop EiD step: After the adsorption step A is completed, the pressure equalization program-controlled valve 81 for equalization is opened to transfer the adsorbent voids in the tower, the product gas components adsorbed by the adsorbent, and the adsorption heat to the adsorption tower with pressure rise. After the pressure rise is substantially equal to the pressure of the pressure drop adsorption tower, the pressure equalization program-controlled valve 81 is closed. According to the adsorption pressure, the number of adsorption towers, the adsorbent performance, the product quality and the yield requirements, the pressure drop is completed in 4 steps, which are abbreviated as E1D, E2D, ... E4D in turn. In particular, when the adsorption tower with the first pressure drop and the adsorption tower with the last pressure rise are pressure-equalized, the final pressure-equalization program-controlled valve at the corresponding position of the final boosting pipeline 10 is opened, and the final boosting regulating valve is adjusted to a determined small opening. When there is no adsorption tank for the sequential release step, the sequential release pipeline 4 is used as a pressure-equalizing pipeline.

[0110] PP1 / 2 step: After the pressure reduction step EiD is completed, the small amount of effective components adsorbed by the adsorbent in the adsorption tower can be further released from the bed layer through the PP1 / 2 step of forward pressure reduction as flushing regeneration gas. PP1 enters V101 discharge tank 1 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-1 for storage, and PP2 enters V102 discharge tank 2 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-2 for storage.

[0111] Reverse pressure release step D: After the forward pressure release step PP1 / 2 is completed, the impurities and part of the effective gas in the adsorption tower are discharged through the desorption program-controlled valve 91 at the bottom of the adsorption tower. After the reverse pressure release is completed, the pressure in the adsorption tower is 0.002-0.45MPaG.

[0112] Flushing P2 / 1 step: In order to make the adsorbent in the adsorption tower regenerated more thoroughly, the flushing regeneration gas discharged from the PP1 / 2 step is used to flush the adsorbent in the adsorption tower that has completed the reverse pressure release step D, and the residual impurities are completely regenerated from the adsorbent. First, the regulating valve HV102 in the flushing and regeneration regulating module B controls the speed of the gas discharge in the V102 discharge tank 2, and the single and double series adsorption towers that have completed the reverse release step D are switched through two program-controlled valves KV-2A / B to perform the second flushing and regeneration P2 process. Finally, the regulating valve HV101 in the flushing and regeneration regulating module A controls the speed of the gas discharge in the V101 discharge tank 1, and the single and double series adsorption towers that have completed the second flushing and regeneration P2 process are switched through two program-controlled valves KV-1A / B to perform the third flushing and regeneration P1 process. During the flushing process, the pressure in the flushed adsorption tower is reduced to 0.001~0.40MPaG.

[0113] Pressure increase EiR step: This step corresponds to the pressure reduction EiD step. After the flushing P2 / 1 step is completed, the gas of the pressure reduction EiD step is used to gradually increase the pressure of the adsorption tower that has completed the flushing P3 / 2 / 1 step. This step can be completed in 4 times, which are abbreviated as E4R, ... E2R, E1R respectively.

[0114] Final pressure-raising FR step: Since the pressure of the adsorption tower cannot reach the adsorption pressure through multiple pressure-raising EiR steps, it is necessary to use product gas to increase the pressure from the top of the adsorption tower to reach the adsorption operating pressure. According to different processes, the adsorption tower can also be pressurized with raw gas from the feed end of the bed, or the adsorption tower can be finally pressurized with product gas and raw gas at the same time until the adsorption tower reaches the adsorption operating pressure. Finally, the adsorption tower enters the next cycle according to the operating procedure.

[0115] Each adsorption tower goes through the same sequence of steps, but the process steps are staggered by one sub-cycle to ensure the separation process is continuous.

[0116] Implementation Case 6: Separation and purification process with 3 downstream tanks and 12 adsorption towers

[0117] Table 7: 12-2-7 / P operation process table

[0118]

[0119]

[0120] From the operation process table 7 of this example, it can be known that each adsorption tower undergoes adsorption A, the first pressure drop E1D, the second pressure drop E2D, the third pressure drop E3D, the fourth pressure drop E4D, the fifth pressure drop E5D, the sixth pressure drop E6D, the seventh pressure drop E7D, sequential release PP1, sequential release PP2, sequential release PP3, reverse release D, flushing 3 P3, flushing 2 P2, flushing 1 P1, the seventh pressure rise E7R, the sixth pressure rise E6R, the fifth pressure rise E5R, the fourth pressure rise E4R, the third pressure rise E3R, the second pressure rise E2R, the first pressure rise E1R and the final pressure rise FR in one cycle. The remaining adsorption towers also undergo the same process, but they are staggered by one sub-cycle in time.

[0121] like Figure 6 As shown, the adsorption towers T101, T103, T105, T107, T109 and T111 with odd numbers form a single series, and the adsorption towers T102, T104, T106, T108, T110 and T112 with even numbers form a double series.

[0122] Three downstream tanks V101, V102, and V103 are set up, and a downstream common program-controlled valve KV-1, KV-2, and KV-3 are set up on the downstream pipeline 4. The flushing and regeneration regulating module mainly includes the regulating valves HV-101, HV-102, and HV-103 respectively set up on the downstream tank outlet main pipe. The odd-numbered flushing common program-controlled valves KV-1A, KV-2A, and KV-3A and the even-numbered flushing common program-controlled valves KV-1B, KV-2B, and KV-3B are respectively set up on the flushing inlet main pipe. The downstream common program-controlled valve KV-1 is connected to the downstream tank V101. The flushing regulating module A consists of the flushing regulating valve HV-101 and two common program-controlled valves KV-1A / B. The common program-controlled valve KV-2 for the discharge is connected to the discharge tank V102, and the flushing control module B is composed of the flushing control valve HV-102 and two common program-controlled valves KV-2A / B. The common program-controlled valve KV-3 for the discharge is connected to the discharge tank V103, and the flushing control module C is composed of the flushing control valve HV-103 and two common program-controlled valves KV-3A / B.

[0123] The specific process is as follows:

[0124] Adsorption A step: open the raw gas program-controlled valve 31 and the product gas program-controlled valve 32, the raw gas enters the adsorption tower from the bottom of the adsorption tower through the raw gas pipeline 1 and the raw gas program-controlled valve 31 at 4.0-6.0 MPa and 20-40°C, the impurity components in the raw gas are adsorbed by the adsorbent in the adsorption tower, and the weakly adsorbable components such as hydrogen are sent out of the boundary area from the upper part of the adsorption tower through the pipeline and the product gas program-controlled valve 32. When the impurity components in the product gas meet the requirements, close the raw gas and product gas program-controlled valves 32, and the adsorption step ends.

[0125] Pressure drop EiD step: After the adsorption step A is completed, the pressure equalization program-controlled valve 81 for equalization is opened to transfer the adsorbent voids in the tower and the product gas components adsorbed by the adsorbent and the adsorption heat to the adsorption tower with pressure increase. After the pressure of the pressure increase and the pressure drop adsorption tower are basically equal, the pressure equalization program-controlled valve 81 is closed. According to the adsorption pressure, the number of adsorption towers, the adsorbent performance, the product quality and the yield requirements, the pressure drop is completed in 7 steps, which are abbreviated as E1D, E2D, ... E7D in turn. In particular, when the adsorption tower with the first pressure drop and the adsorption tower with the last pressure increase are equalized, the final boost program-controlled valve at the corresponding position of the final boost pipeline 10 is opened, and the final boost regulating valve is adjusted to a certain small opening.

[0126] PP1 / 2 / 3 steps: After the pressure reduction step EiD is completed, the small amount of effective components adsorbed by the adsorbent in the adsorption tower can be further released from the bed layer through the PP1 / 2 / 3 steps of the forward pressure reduction as flushing regeneration gas. PP1 enters the V101 discharge tank 1 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-1 for storage, PP2 enters the V102 discharge tank 2 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-2 for storage, and PP3 enters the V103 discharge tank 2 through the dedicated program-controlled valve 41 and the common program-controlled valve KV-3 for storage.

[0127] Reverse depressurization step D: After the sequential depressurization steps PP1 / 2 / 3 are completed, the impurities and part of the effective gas in the adsorption tower are discharged through the desorption program-controlled valve 91 at the bottom of the adsorption tower. After the reverse depressurization is completed, the pressure in the adsorption tower is 0.002-0.450 MPaG.

[0128] Flushing P3 / 2 / 1 step: In order to regenerate the adsorbent in the adsorption tower more thoroughly, the flushing regeneration gas discharged from the PP1 / 2 / 3 step is used to flush the adsorbent in the adsorption tower that has completed the reverse pressure release step D, and the residual impurities are completely regenerated from the adsorbent. First, the regulating valve HV103 in the flushing regeneration regulating module C controls the speed of the V103 downstream tank three, and the first flushing regeneration P3 process is performed on the single and double series adsorption towers that have completed the reverse pressure release step D through the switching of two program-controlled valves KV-3A / B. Then the regulating valve HV102 in the flushing and regeneration regulating module B controls the speed of the gas discharge in the second V102 discharge tank, and the two program-controlled valves KV-2A / B are switched to perform the second flushing and regeneration P2 process on the single and double series adsorption towers that have completed the first flushing P3 step. Finally, the regulating valve HV101 in the flushing and regeneration regulating module A controls the speed of the gas discharge in the first V101 discharge tank, and the two program-controlled valves KV-1A / B are switched to perform the third flushing and regeneration P1 process on the single and double series adsorption towers that have completed the second flushing and regeneration P2 process. During the flushing process, the pressure in the flushed adsorption tower drops to 0.001~0.40MPaG.

[0129] Pressure increase EiR step: This step corresponds to the pressure reduction EiD step. After the flushing P3 / 2 / 1 step is completed, the gas of the pressure reduction EiD step is used to gradually increase the pressure of the adsorption tower that has completed the flushing P2 / 1 step. This step can be completed in 7 times, which are abbreviated as E7R, ... E2R, E1R respectively.

[0130] Final pressure-raising FR step: Since the pressure of the adsorption tower cannot reach the adsorption pressure through multiple pressure-raising EiR steps, it is necessary to use product gas to increase the pressure from the top of the adsorption tower to reach the adsorption operating pressure. According to different processes, the adsorption tower can also be pressurized from the feed end of the bed with raw gas, or the adsorption tower can be finally pressurized with product gas and raw gas at the same time until the adsorption tower reaches the adsorption operating pressure, and finally the adsorption tower enters the next cycle according to the operation procedure.

[0131] Each adsorption tower goes through the same sequence of steps, but the process steps are staggered by one sub-cycle to ensure the separation process is continuous.

[0132] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A gas separation and purification system with stable flushing and regeneration effect, characterized in that: The invention comprises a raw gas pipeline (1) and a product gas pipeline (2), wherein a plurality of adsorption pipelines (3) are connected between the raw gas pipeline (1) and the product gas pipeline (2), an adsorption tower is arranged on the adsorption pipeline (3), a discharge pipeline (4) is connected between the plurality of adsorption pipelines (3), and a plurality of flushing and regeneration regulating pipelines (5) are connected in parallel on the discharge pipeline (4); a discharge tank and a flushing regulating valve are arranged in sequence on the flushing and regeneration regulating pipeline (5), an odd-numbered flushing pipeline (6) is connected between the plurality of odd-numbered adsorption pipelines (3), an even-numbered flushing pipeline (7) is connected between the plurality of even-numbered adsorption pipelines (3), and the other end of the flushing and regeneration regulating pipeline (5) is respectively connected to the odd-numbered flushing pipeline (6) and the even-numbered flushing pipeline (7); A raw gas programmable valve (31) is provided on one end of the adsorption pipeline (3) close to the raw gas pipeline (1), and a product gas programmable valve (32) is provided on one end of the adsorption pipeline (3) close to the product gas pipeline (2); A plurality of pressure-equalizing pipelines (8) are also connected between the plurality of adsorption pipelines (3), and a pressure-equalizing programmable valve (81) is provided between the pressure-equalizing pipeline (8) and the adsorption pipeline (3); A dedicated program-controlled valve (41) for downstream discharge is connected between the downstream discharge pipeline (4) and the adsorption pipeline (3), a common program-controlled valve for downstream discharge is provided on the flushing and regeneration regulating pipeline (5), and the dedicated program-controlled valve (41) for downstream discharge is located on a side of the downstream discharge tank away from the flushing regulating valve; An odd-number flushing dedicated program-controlled valve (61) is connected between the odd-number flushing pipeline (6) and the odd-number adsorption pipeline (3), an even-number flushing dedicated program-controlled valve (71) is connected between the even-number flushing pipeline (7) and the even-number adsorption pipeline (3), an odd-number flushing common program-controlled valve is provided at one end of the flushing regeneration regulating pipeline (5) connected to the odd-number flushing pipeline (6), and an even-number flushing common program-controlled valve is provided at one end of the flushing regeneration regulating pipeline (5) connected to the even-number flushing pipeline (7); It also includes a plurality of desorption pipelines (9), wherein a desorption program-controlled valve (91) is connected between the desorption pipeline (9) and the plurality of adsorption pipelines (3); A final boosting pipeline (10) is also connected between the plurality of adsorption pipelines (3); a final boosting dedicated programmable valve (101) is connected between the final boosting pipeline (10) and the adsorption pipeline (3); the final boosting pipeline (10) is connected to the product gas pipeline (2); a product gas regulating valve (102) is connected between the final boosting pipeline (10) and the product gas pipeline (2).

2. A gas separation and purification method with stable flushing and regeneration effect using the system of claim 1, characterized in that: The steps include: S1: The raw gas is sent into the adsorption pipeline (3) for separation and purification, and the product gas is sent out of the boundary area; S2: transferring the adsorbent voids in the adsorption tower, the product gas components adsorbed by the adsorbent, and the adsorption heat to the adsorption tower with increased pressure until the pressure of the adsorption tower with decreased pressure is equal to that of the adsorption tower with increased pressure; S3: discharge the small amount of effective components in the adsorbent voids in the adsorption tower and adsorbed by the adsorbent into a storage tank for storage; S4: Reverse the impurities and part of the effective gas in the adsorption tower; S5: flushing the adsorbent in the adsorption tower that has completed step S4 with the flushing regeneration gas discharged in step S3; wherein, when a single sequential discharge tank flushes an odd-numbered adsorption tower and an even-numbered adsorption tower, the same flushing regulating valve is used to adjust the flow rate; S6: using the gas from the adsorption tower in step S2 to increase the pressure of the adsorption tower in step S5, until the pressure of the adsorption tower with increased pressure is equal to that of the adsorption tower with decreased pressure; S7: Use the product gas to finally increase the pressure from the top of the adsorption tower to reach the adsorption operating pressure.

3. A gas separation and purification method with stable flushing and regeneration effect according to claim 2, characterized in that: In step S2 and step S5, the final pressure-raising pipeline (10) of the final pressure-raising in step S7 is used to equalize the pressure of the adsorption tower with the first pressure drop and the adsorption tower with the last pressure increase.

4. A gas separation and purification method with stable flushing and regeneration effect according to claim 2, characterized in that: In step S1, the raw gas enters the adsorption pipeline (3) at 0.6-6.0 MPa and 10-60°C.

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