Propane dehydrogenation hydrogen-rich dry gas gradient utilization system
By setting up a secondary discharge pipeline in the PSA analytical gas device and splitting the high and low-purity hydrogen pipeline network, the problem of rising operating costs of the hydrogen pipeline network is solved, and the utilization of hydrogen gradient is realized, reducing hydrogen losses and operating costs are reduced, and the hydrogen quality is improved.
Patent Information
- Application Number
- CN202420827656.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-18
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-04-18
AI Technical Summary
In the prior art, the increase in operating costs of hydrogen pipelines is wasted due to the high-cost hydrogen entering the PSA analytical gas, and the hydrogen refueling device relaxes the requirements for hydrogen purity, resulting in low hydrogen utilization efficiency.
By setting up a secondary discharge pipeline in the PSA analytical gas device, the high- and low-purity hydrogen pipeline network is split, and the high-purity hydrogen is provided by the dry gas hydrogen production device and the PSA analytical gas device, and the low-purity hydrogen is provided by the reforming device to realize the hydrogen gradient utilization.
It reduces hydrogen loss, reduces the operating cost of the hydrogen pipeline network, improves the hydrogen quality of downstream devices, and reduces the load and consumption of the turbine.
Smart Images
Figure CN222605889U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gradient utilization of hydrogen-rich dry gas from propane dehydrogenation, in particular to a gradient utilization system of hydrogen-rich dry gas from propane dehydrogenation. Background Art
[0002] Hydrogen is a light and highly reactive gas with many scientific uses. Many industries also need it to achieve different basic purposes. Hydrogen is used in oil refineries to produce petroleum products such as diesel and gasoline. It helps to avoid many impurities in the final products produced by these refineries. Different chemical industries need hydrogen to produce important hydrogen-based compounds. As the hydrogenation process technology of oil refineries gradually matures, the requirements for hydrogen purity of hydrogenation units of various oil refineries are gradually decreasing. At present, the hydrogen production units of various refineries are mainly concentrated in reforming units, dry gas hydrogen production units, and PDH hydrogen-rich dry gas. At present, PDH hydrogen-rich dry gas is high-purity hydrogen produced after matching PSA adsorption.
[0003] In actual production, based on the premise that the hydrogen purity requirements of the hydrogenation unit are relaxed, the hydrogen produced by the dry gas hydrogen production unit and the hydrogen after purification of the PDH hydrogen-rich dry gas will cause part of the high-cost hydrogen to enter the PSA analysis gas and be wasted, resulting in an increase in the operating costs of the hydrogen pipeline network. Utility Model Content
[0004] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide a propane dehydrogenation hydrogen-rich dry gas gradient utilization system, which realizes the gradient utilization of the hydrogen pipeline network and reduces the operating cost of the hydrogen pipeline network by setting a secondary discharge pipeline of the PSA gas analysis device.
[0005] The utility model is realized by adopting the following technical solutions:
[0006] The propane dehydrogenation hydrogen-rich dry gas gradient utilization system comprises a dry gas hydrogen production device, a PSA gas analysis device, and a reforming device. The dry gas hydrogen production device is connected to the high-purity hydrogen user device through a high-purity hydrogen user device pipeline, the reforming device is connected to the low-purity hydrogen user device through a low-purity hydrogen user device pipeline, the PSA gas analysis device is connected to the high-purity hydrogen user device pipeline through a PSA gas analysis device primary discharge pipeline, and the PSA gas analysis device is connected to the low-purity hydrogen user device pipeline through a PSA gas analysis device secondary discharge pipeline.
[0007] The propane dehydrogenation hydrogen-rich dry gas gradient utilization system also includes a PDH hydrogen-rich dry gas production tower, and the PDH hydrogen-rich dry gas production tower is connected to the PSA gas analysis device through a pipeline entering the PSA gas analysis device.
[0008] The hydrogen-rich dry gas components and hydrogen purity of the PDH hydrogen-rich dry gas production tower are better than those of reformed hydrogen. By adding a secondary discharge pipeline of the PSA analysis gas device and splitting the high- and low-purity hydrogen pipelines, the high-purity hydrogen pipeline network is provided by the dry gas hydrogen production device and the PSA analysis gas device; the low-purity hydrogen pipeline is provided by the reforming device and other ancillary hydrogen production devices.
[0009] The PDH hydrogen-rich dry gas production tower is connected to a circulation pump, and the lower part of the PDH hydrogen-rich dry gas production tower is connected to a reboiler.
[0010] The pipeline inlet to the high-purity hydrogen using device is provided with a pipeline valve inlet to the high-purity hydrogen using device, and the pipeline inlet to the low-purity hydrogen using device is provided with a pipeline valve inlet to the low-purity hydrogen using device.
[0011] All high-purity hydrogen produced by the dry gas hydrogen production unit is incorporated into the high-purity hydrogen pipeline network. On the premise that the hydrogen produced by the remaining PSA analysis gas unit meets the needs of the high-purity hydrogen pipeline network, the surplus PDH hydrogen-rich dry gas is directly incorporated into the low-purity hydrogen pipeline network and mixed with the reformed hydrogen before entering the downstream hydrogen use unit.
[0012] The primary discharge pipeline of the PSA gas analysis device is provided with a PSA gas analysis device primary discharge pipeline valve, and the secondary discharge pipeline of the PSA gas analysis device is provided with a PSA gas analysis device secondary discharge pipeline valve.
[0013] A connecting pipeline is provided between the pipeline for inletting the high-purity hydrogen using device and the pipeline for inletting the low-purity hydrogen using device.
[0014] The connection between the connecting pipeline and the pipeline for high-purity hydrogen use device is located on the side close to the high-purity hydrogen use device, and the connection between the first-level discharge pipeline of the PSA analysis gas device and the pipeline for high-purity hydrogen use device is located on the side close to the dry gas hydrogen production device.
[0015] Compared with the prior art, the beneficial effects of the utility model are:
[0016] (1) Reduce the amount of desorbed gas produced by PSA pressure swing adsorption and reduce hydrogen loss; based on the PSA hydrogen recovery rate of 80%, 20% of hydrogen loss during the purification process of hydrogen-rich dry gas can be reduced;
[0017] (2) After the hydrogen-rich dry gas is incorporated into the reformed hydrogen, the quality of the new hydrogen in the downstream unit improves, the load of the steam turbine in the wax oil hydrogenation unit decreases, and the consumption of medium-pressure steam in the steam turbine decreases accordingly;
[0018] (3) Realize gradient utilization of hydrogen pipeline network and reduce the operating cost of hydrogen pipeline network. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a structural schematic diagram of the propane dehydrogenation hydrogen-rich dry gas gradient utilization system of the utility model;
[0020] In the figure: 1. Dry gas hydrogen production device; 2. PSA analysis gas device; 3. Reforming device; 4. High-purity hydrogen user device; 5. Low-purity hydrogen user device; 6. PDH hydrogen-rich dry gas production tower; 7. Pipeline entering high-purity hydrogen user device; 8. Pipeline entering low-purity hydrogen user device; 9. Pipeline entering PSA analysis gas device; 10. Primary discharge pipeline of PSA analysis gas device; 11. Secondary discharge pipeline of PSA analysis gas device; 12. Connecting pipeline; 13. Valve of secondary discharge pipeline of PSA analysis gas device; 14. Valve of primary discharge pipeline of PSA analysis gas device; 15. Valve of pipeline entering high-purity hydrogen user device; 16. Valve of pipeline entering low-purity hydrogen user device; 17. Reboiler; 18. Circulation pump. DETAILED DESCRIPTION
[0021] In order to make the purpose and technical solution of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings.
[0022] Example 1
[0023] like Figure 1As shown, the propane dehydrogenation hydrogen-rich dry gas gradient utilization system includes a dry gas hydrogen production device 1, a PSA gas analysis device 2, and a reforming device 3. The dry gas hydrogen production device 1 is connected to the high-purity hydrogen user 4 through a high-purity hydrogen user pipeline 7, and the reforming device 3 is connected to the low-purity hydrogen user 5 through a low-purity hydrogen user pipeline 8. The PSA gas analysis device 2 is connected to the high-purity hydrogen user pipeline 7 through the PSA gas analysis device primary discharge pipeline 10, and the PSA gas analysis device 2 is connected to the low-purity hydrogen user pipeline 8 through the PSA gas analysis device secondary discharge pipeline 11. A PDH hydrogen-rich dry gas production tower 6 is also included, and the PDH hydrogen-rich dry gas production tower 6 is connected to the PSA gas analysis device 2 through a PSA gas analysis device pipeline 9. The hydrogen-rich dry gas components and hydrogen purity of the PDH hydrogen-rich dry gas production tower 6 are better than those of the reformed hydrogen. By adding a secondary discharge pipeline 11 of the PSA gas analysis device and splitting the high-purity and low-purity hydrogen pipeline networks, the high-purity hydrogen pipeline network hydrogen is provided by the dry gas hydrogen production device 1 and the PSA gas analysis device 2; the low-purity hydrogen pipeline network is provided by the hydrogen production device attached to the reforming device 3. A circulating pump 18 is connected to the PDH hydrogen-rich dry gas production tower 6, and a reboiler 17 is connected below the PDH hydrogen-rich dry gas production tower 6. A valve 15 for entering the high-purity hydrogen user pipeline 7 is provided, and a valve 16 for entering the low-purity hydrogen user pipeline 8 is provided. A valve 14 for entering the first-level discharge pipeline 10 of the PSA gas analysis device is provided, and a valve 13 for entering the second-level discharge pipeline 11 of the PSA gas analysis device is provided. A connecting pipeline 12 is provided between the pipeline 7 for entering the high-purity hydrogen user pipeline and the pipeline 8 for entering the low-purity hydrogen user pipeline. The connection between the connecting pipeline 12 and the pipeline 7 for the high-purity hydrogen use device is located on the side close to the high-purity hydrogen use device 4, and the connection between the first-level discharge pipeline 10 of the PSA analysis gas device and the pipeline 7 for the high-purity hydrogen use device is located on the side close to the dry gas hydrogen production device 1.
[0024] The above propane dehydrogenation hydrogen-rich dry gas gradient utilization system, when in operation, comprises the following steps:
[0025] (1) The gas phase produced by the PDH hydrogen-rich dry gas production tower 6 enters the PSA gas analysis device 2 through a pipeline for treatment, the high-purity hydrogen generated by the dry gas hydrogen production device 1 enters the high-purity hydrogen use device 4 through the high-purity hydrogen use device pipeline 7, and the low-purity hydrogen produced by the reforming device 3 enters the low-purity hydrogen use device 5 through the low-purity hydrogen use device pipeline 8; (2) The hydrogen-rich dry gas components and hydrogen purity of the PDH hydrogen-rich dry gas production tower 6 are better than those of the reformed hydrogen. The high- and low-purity hydrogen pipeline networks are separated through the secondary discharge pipeline 11 of the PSA gas analysis device, wherein the high-purity hydrogen pipeline network hydrogen is provided by the dry gas hydrogen production device 1 and the PSA gas analysis device 2, and the low-purity hydrogen pipeline network is provided by the hydrogen production device attached to the reforming device 3.
Claims
1. A propane dehydrogenation hydrogen-rich dry gas gradient utilization system, characterized in that: The invention comprises a dry gas hydrogen production device (1), a PSA gas analysis device (2), and a reforming device (3). The dry gas hydrogen production device (1) is connected to a high purity hydrogen use device (4) via a high purity hydrogen use device pipeline (7), the reforming device (3) is connected to a low purity hydrogen use device pipeline (5) via a low purity hydrogen use device pipeline (8), the PSA gas analysis device (2) is connected to a high purity hydrogen use device pipeline (7) via a PSA gas analysis device primary discharge pipeline (10), and the PSA gas analysis device (2) is connected to a low purity hydrogen use device pipeline (8) via a PSA gas analysis device secondary discharge pipeline (11).
2. The propane dehydrogenation hydrogen-rich dry gas gradient utilization system according to claim 1, characterized in that: It also includes a PDH hydrogen-rich dry gas production tower (6), which is connected to the PSA gas analysis device (2) via a PSA gas analysis device pipeline (9).
3. The propane dehydrogenation hydrogen-rich dry gas gradient utilization system according to claim 2, characterized in that: The PDH hydrogen-rich dry gas production tower (6) is connected to a circulation pump (18), and the bottom of the PDH hydrogen-rich dry gas production tower (6) is connected to a reboiler (17).
4. The propane dehydrogenation hydrogen-rich dry gas gradient utilization system according to claim 1, characterized in that: The pipeline (7) for inletting high-purity hydrogen using device is provided with a pipeline valve (15) for inletting high-purity hydrogen using device, and the pipeline (8) for inletting low-purity hydrogen using device is provided with a pipeline valve (16) for inletting low-purity hydrogen using device.
5. The propane dehydrogenation hydrogen-rich dry gas gradient utilization system according to claim 1, characterized in that: The PSA gas analysis device primary discharge pipeline (10) is provided with a PSA gas analysis device primary discharge pipeline valve (14), and the PSA gas analysis device secondary discharge pipeline (11) is provided with a PSA gas analysis device secondary discharge pipeline valve (13).
6. The propane dehydrogenation hydrogen-rich dry gas gradient utilization system according to claim 1, characterized in that: A connecting pipeline (12) is provided between the pipeline (7) for inletting the high-purity hydrogen using device and the pipeline (8) for inletting the low-purity hydrogen using device.
7. The propane dehydrogenation hydrogen-rich dry gas gradient utilization system according to claim 6, characterized in that: The connection point between the connecting pipe (12) and the pipe (7) for the high-purity hydrogen using device is located on a side close to the high-purity hydrogen using device (4), and the connection point between the first-level discharge pipe (10) of the PSA gas analysis device and the pipe (7) for the high-purity hydrogen using device is located on a side close to the dry gas hydrogen production device (1).