Carbon dioxide desulfurization and dealkylation device
By introducing low-pressure nitrogen pipes into the carbon dioxide outlet pipe for circulating and purge in the preheater and heater, the problems of long driving time and high cost of carbon dioxide are solved, and the effects of rapid heating and cost reduction are achieved.
Patent Information
- Application Number
- CN202422044891.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-22
AI Technical Summary
The existing carbon dioxide driving process takes a long time and consumes energy, resulting in high production costs. In particular, the dehydrogenation and desulfurization system has the longest heating time, making it impossible to quickly produce qualified food-grade carbon dioxide.
The low-pressure nitrogen pipe is introduced into the carbon dioxide outlet pipe in front of the compressor, and the low-pressure nitrogen is circulated and purged in the preheater and heater, and the dehydrogenation pipeline is heated up in advance to above 200℃, shortening the driving time.
It realizes rapid heating of the carbon dioxide device before driving, shortens driving time and reduces production costs.
Smart Images
Figure CN223055601U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of carbon dioxide purification, and particularly relates to a carbon dioxide desulfurization and dehydrocarbonation device. Background Art
[0002] The current liquid carbon dioxide startup procedure is as follows: after the main device methanol device outputs qualified and has sufficient surplus carbon dioxide, the surplus carbon dioxide is sent to the carbon dioxide device, pressurized by the carbon dioxide compressor and then sent to the desulfurization and dehydrocarbonation system for system heating. After the heating is qualified and it is confirmed that the dehydrocarbonation and desulfurization are qualified, it is sent to the downstream system to continue startup.
[0003] From the startup of the carbon dioxide compressor to the output of qualified liquid carbon dioxide, it takes 16 - 17 hours. The device startup takes a long time, consumes a large amount of energy, and is uneconomical. Among them, the heating of the dehydrocarbonation and desulfurization system takes the longest time. It takes about 12 hours from the start of heating of the dehydrocarbonation and desulfurization system to the completion of heating. During this heating period, the entire carbon dioxide system is always in a high energy consumption operation state, but qualified food-grade carbon dioxide cannot be produced, resulting in a very high startup cost of the carbon dioxide system. Summary of the Utility Model
[0004] In order to solve the above technical problems, the utility model designs a carbon dioxide desulfurization and dehydrocarbonation device to shorten the device startup time and reduce the production cost.
[0005] The carbon dioxide desulfurization and dehydrocarbonation device of the utility model includes a carbon dioxide outlet pipe connected to the methanol device, and the end of the carbon dioxide outlet pipe is connected to a compressor; the compressor is connected to a desulfurization reactor through a pipeline, the desulfurization reactor is connected to a first inlet of a first preheater through a pipeline, the first outlet of the first preheater is connected to a first inlet of a second preheater through a pipeline, the first outlet of the second preheater is connected to the inlet end of a heater through a pipeline, the outlet end of the heater is connected to the inlet end of a dehydrocarbonation reactor through a pipeline, the outlet end of the dehydrocarbonation reactor is connected to a second inlet of the second preheater through a pipeline, the second outlet of the second preheater is connected back to a second inlet of the first preheater through a pipeline, and the second outlet of the first preheater is connected to a product output pipeline;
[0006] A stop valve a and a stop valve b are arranged on the carbon dioxide outlet pipe. A low-pressure nitrogen pipe is connected to the pipeline between the stop valve a and the stop valve b. A stop valve d is arranged at the head end of the low-pressure nitrogen pipe. The end of the low-pressure nitrogen pipe is connected to the head end of a nitrogen branch pipe, and a check valve a is arranged at the end of the low-pressure nitrogen pipe. The end of the nitrogen branch pipe is connected to the pipeline between the desulfurization reactor and the first preheater. A stop valve e is arranged at the head end of the nitrogen branch pipe, and a check valve b is arranged at the end of the nitrogen branch pipe; a check valve c is arranged on the pipeline between the desulfurization reactor and the first preheater, and the end of the nitrogen branch pipe is connected to the pipeline behind the check valve c.
[0007] A circulation fan is also arranged between the first preheater and the second preheater. The end of the air inlet pipe of the fan is connected to the pipe outside the second air outlet of the second preheater, and a stop valve h is arranged on the air inlet pipe of the fan. A stop valve g is arranged on the pipe outside the second air outlet of the second preheater. The end of the air inlet pipe of the fan is connected between the stop valve g and the second air outlet of the second preheater; the end of the air outlet pipe of the fan is connected to the pipe outside the first air inlet of the second preheater, and a stop valve i is arranged on the air outlet pipe of the fan. A check valve d is arranged on the pipe outside the first air inlet of the second preheater. The end of the air outlet pipe of the fan is connected between the check valve d and the first air inlet of the second preheater.
[0008] A stop valve c is arranged on the pipe between the compressor and the desulfurization reactor; a stop valve f is also arranged on the product output pipeline.
[0009] The pipes between the first air inlet and the first air outlet and between the second air inlet and the second air outlet in the first preheater and the second preheater are all independent spiral pipes.
[0010] The beneficial effects of the present utility model are as follows:
[0011] Compared with the prior art, a low-pressure nitrogen pipe is introduced on the carbon dioxide outlet pipe in front of the compressor in the present utility model. Before starting the compressor, close the stop valves a, b, f, g, open the stop valves d, e, h, i, first introduce low-pressure nitrogen to sequentially enter the first preheater, the second preheater, the heater, and the dehydrocarbon reactor for purging, and under the connection of the circulation fan, make the nitrogen circulate and purge in the second preheater, the heater, and the dehydrocarbon reactor. During this process, quickly heat the dehydrocarbon pipeline to above 200 °C in advance, reducing the heating time; after the heating is completed, start the compressor and perform the desulfurization treatment and dehydrocarbon treatment of carbon dioxide in sequence. Finally, the treated carbon dioxide is output through the product output pipeline. It realizes that before starting the carbon dioxide device, the dehydrocarbon pipeline is heated in advance using low-pressure nitrogen, shortening the start-up time of the carbon dioxide device and reducing the production cost. Description of the Drawings
[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for describing the embodiments will be briefly introduced below.
[0013] Figure 1 It is a schematic structural diagram of the present utility model.
[0014] 1 - Carbon dioxide outlet pipe, 2 - Low-pressure nitrogen pipe, 3 - Compressor, 4 - Desulfurization reactor, 5 - Nitrogen branch pipe, 6 - First preheater, 7 - Second preheater, 8 - Heater, 9 - Dehydrocarbonation reactor, 10 - Circulation fan, 11 - Product output pipeline, 12 - Stop valve a, 13 - Stop valve b, 14 - Stop valve c, 15 - Stop valve d, 16 - Check valve a, 17 - Stop valve e, 18 - Check valve b, 19 - Check valve c, 20 - Stop valve f, 21 - Stop valve g, 22 - Stop valve h, 23 - Check valve d, 24 - Stop valve i, 25 - Fan inlet pipe, 26 - Fan outlet pipe. Detailed implementation mode
[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.
[0016] Embodiment 1
[0017] Refer to Figure 1 As shown, a carbon dioxide desulfurization and dehydrocarbonation device includes a carbon dioxide outlet pipe 1 connected to a methanol device, and the end of the carbon dioxide outlet pipe 1 is connected to a compressor 3; the compressor 3 is connected to a desulfurization reactor 4 through a pipeline, the desulfurization reactor 4 is connected to the first inlet of a first preheater 6 through a pipeline, the first outlet of the first preheater 6 is connected to the first inlet of a second preheater 7 through a pipeline, the first outlet of the second preheater 7 is connected to the inlet end of a heater 8 through a pipeline, the outlet end of the heater 8 is connected to the inlet end of a dehydrocarbonation reactor 9 through a pipeline, the outlet end of the dehydrocarbonation reactor 9 is connected to the second inlet of the second preheater 7 through a pipeline, the second outlet of the second preheater 7 is connected back to the second inlet of the first preheater 6 through a pipeline, and the second outlet of the first preheater 6 is connected to a product output pipeline 11; after the compressor 3 is started, carbon dioxide is successively desulfurized by the desulfurization reactor 4, and then heated and raised in temperature by the first preheater 6, the second preheater 7, and the heater 8, and finally enters the dehydrocarbonation reactor 9 for dehydrocarbonation. Finally, it is circulated back to the second inlet of the first preheater 6 through the second outlet of the second preheater 7, and the second outlet of the first preheater 6 is connected to the product output pipeline 11. The desulfurized and dehydrocarbonated carbon dioxide is output through the product output pipeline 11.
[0018] In order to shorten the start-up time of the compressor 3 and reduce the production cost, a stop valve a12 and a stop valve b13 are provided on the carbon dioxide outlet pipe 1. A low-pressure nitrogen pipe 2 is connected to the pipe between the stop valve a12 and the stop valve b13. The head end of the low-pressure nitrogen pipe 2 is connected to the low-pressure nitrogen pipe network of the methanol plant, and a stop valve d15 is provided at the head end. The tail end of the low-pressure nitrogen pipe 2 is connected to the head end of the nitrogen branch pipe 5, and a check valve a16 is provided at the tail end of the low-pressure nitrogen pipe 2. The tail end of the nitrogen branch pipe 5 is connected to the pipe between the desulfurization reactor 4 and the first preheater 6. A stop valve e17 is provided at the head end of the nitrogen branch pipe 5, and a check valve b18 is provided at the tail end of the nitrogen branch pipe 5; a check valve c19 is provided on the pipe between the desulfurization reactor 4 and the first preheater 6, and the tail end of the nitrogen branch pipe 5 is connected to the pipe after the check valve c19;
[0019] In order to further save energy, a circulation fan 10 is also provided between the first preheater 6 and the second preheater 7. The head end of the fan inlet pipe 25 of the circulation fan 10 is connected to the pipe outside the second air outlet of the second preheater 7, and a stop valve h22 is provided on the fan inlet pipe 25. A stop valve g21 is provided on the pipe outside the second air outlet of the second preheater 7. The head end of the fan inlet pipe 25 is connected between the stop valve g21 and the second air outlet of the second preheater 7; the head end of the fan outlet pipe 26 of the circulation fan 10 is connected to the pipe outside the first air inlet of the second preheater 7, and a stop valve i24 is provided on the fan outlet pipe 26. A check valve d23 is provided on the pipe outside the first air inlet of the second preheater 7. The head end of the fan outlet pipe 26 is connected between the check valve d23 and the first air inlet of the second preheater 7.
[0020] Before starting the compressor 3, close the stop valve a12, stop valve b13, stop valve f20, stop valve g21, and open the stop valve d15, stop valve e17, stop valve h22, stop valve i24. First, introduce 3000 Nm³ / h of low-pressure nitrogen into the first preheater 6, second preheater 7, heater 8, and dehydrocarbonation reactor 9 in sequence for purging. Under the connection of the circulation fan 10, the nitrogen is circulated and purged in the second preheater 7, heater 8, and dehydrocarbonation reactor 9. During this process, quickly heat up the dehydrocarbonation pipeline to above 200 °C in advance, reducing the heating time; after the heating is completed, close the stop valve d15, stop valve e17, stop valve h22, stop valve i24, and open the stop valve a12, stop valve b13, stop valve c14, stop valve f20, stop valve g21, and then start the compressor 3, so as to pass in carbon dioxide and perform desulfurization treatment and dehydrocarbonation treatment of carbon dioxide in sequence. Finally, the treated carbon dioxide is output through the product output pipeline 11. It realizes that before starting the carbon dioxide device, the dehydrocarbonation pipeline is preheated with low-pressure nitrogen in advance, shortening the start-up time of the carbon dioxide device and reducing the production cost.
[0021] A stop valve c14 is provided on the pipeline between the compressor 3 and the desulfurization reactor 4 to control the output of carbon dioxide from the compressor 3; a stop valve f20 is also provided on the product output pipeline 11 to control the output of the product carbon dioxide.
[0022] The pipelines between the first inlet and the first outlet and between the second inlet and the second outlet in the first preheater 6 and the second preheater 7 are both independent spiral pipelines. The spiral pipelines can make the gas heated more evenly and obtain a better hydrocarbon removal effect.
[0023] The preferred embodiments of the present utility model disclosed above are only used to help explain the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to only the specific embodiments. Obviously, many modifications and variations can be made according to the content of this specification.
Claims
1. Carbon dioxide desulfurization and dehydrocarbonization device, including a carbon dioxide outlet pipe (1) connected to a methanol device, the end of the carbon dioxide outlet pipe (1) is connected to a compressor (3), characterized in that, The compressor (3) is connected to the desulfurization reactor (4) through a pipeline. The desulfurization reactor (4) is connected to the first air inlet of the first preheater (6) through a pipeline. The first air outlet of the first preheater (6) is connected to the first air inlet of the second preheater (7) through a pipeline. The first air outlet of the second preheater (7) is connected to the inlet end of the heater (8) through a pipeline. The outlet end of the heater (8) is connected to the inlet end of the dehydrocarbonation reactor (9) through a pipeline. The outlet end of the dehydrocarbonation reactor (9) is connected to the second air inlet of the second preheater (7) through a pipeline. The second air outlet of the second preheater (7) is connected back to the second air inlet of the first preheater (6) through a pipeline. The second air outlet of the first preheater (6) is connected to the product output pipeline (11). A stop valve a (12) and a stop valve b (13) are provided on the carbon dioxide outlet pipe (1). A low-pressure nitrogen gas pipe (2) is connected to the pipeline between the stop valve a (12) and the stop valve b (13). A stop valve d (15) is provided at the head end of the low-pressure nitrogen gas pipe (2). The tail end of the low-pressure nitrogen gas pipe (2) is connected to the head end of the nitrogen gas branch pipe (5), and a check valve a (16) is provided at the tail end of the low-pressure nitrogen gas pipe (2). The tail end of the nitrogen gas branch pipe (5) is connected to the pipeline between the desulfurization reactor (4) and the first preheater (6). A stop valve e (17) is provided at the head end of the nitrogen gas branch pipe (5), and a check valve b (18) is provided at the tail end of the nitrogen gas branch pipe (5). A check valve c (19) is provided on the pipeline between the desulfurization reactor (4) and the first preheater (6). The tail end of the nitrogen gas branch pipe (5) is connected to the pipeline behind the check valve c (19).
2. The carbon dioxide desulfurization and dehydrocarbonation device according to claim 1, wherein A circulation fan (10) is further provided between the first preheater (6) and the second preheater (7). The head end of the fan inlet pipe (25) of the circulation fan (10) is connected to the pipeline outside the second air outlet of the second preheater (7), and a stop valve h (22) is provided on the fan inlet pipe (25). A stop valve g (21) is provided on the pipeline outside the second air outlet of the second preheater (7). The head end of the fan inlet pipe (25) is connected between the stop valve g (21) and the second air outlet of the second preheater (7). The head end of the fan outlet pipe (26) of the circulation fan (10) is connected to the pipeline outside the first air inlet of the second preheater (7), and a stop valve i (24) is provided on the fan outlet pipe (26). A check valve d (23) is provided on the pipeline outside the first air inlet of the second preheater (7). The head end of the fan outlet pipe (26) is connected between the check valve d (23) and the first air inlet of the second preheater (7).
3. The carbon dioxide desulfurization and dehydrocarbonization device according to claim 1, characterized in that, A stop valve c (14) is provided on the pipeline between the compressor (3) and the desulfurization reactor (4). A stop valve f (20) is further provided on the product output pipeline (11).
4. The carbon dioxide desulfurization and dehydrocarbonization device according to claim 1, wherein, The pipelines between the first air inlet and the first air outlet and between the second air inlet and the second air outlet in the first preheater (6) and the second preheater (7) are all independent spiral pipelines.