Green ammonia synthesis system capable of flexibly supplementing heat
By designing a flexible heat-replenishing chlorammonia synthesis system including a synthesis gas mixer, an electric furnace, an ammonia synthesis tower, a boiler water heat exchanger and a heat exchanger, the problem of low catalyst activity during low load operation is solved, and effective heat replenishment of the catalyst and the improvement of ammonia synthesis efficiency is achieved.
Patent Information
- Application Number
- CN202422170339.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-09-05
AI Technical Summary
When the ingammonia synthesis device is running at low load, the catalyst activity is low, which affects the production efficiency of synthetic ammonia. It is affected by the fluctuations in the power of new energy such as wind and light, and requires flexible heat replenishment to activate or maintain catalyst activity.
A flexible heat-replenishing chlorammonia synthesis system is designed, including a syngas mixer, an electric furnace, an ammonia synthesis tower, a boiler water heat exchanger and a heat exchanger. Through the combination of these devices, the rapid and flexible heating of the syngas mixture is achieved to ensure that the catalyst remains active during low load operation.
It realizes effective heat replenishment of catalysts during low-load operation, improves the production efficiency of ammonia synthesis, can cope with the volatility of new energy power, and ensures the stable operation of the system.
Smart Images
Figure CN223047265U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of ammonia synthesis, and particularly relates to a green ammonia synthesis system with flexible heat supplement. Background Technique
[0002] Green ammonia synthesis mainly relies on green ammonia production technology, which is a process of using renewable energy to generate electricity, producing hydrogen by electrolyzing water and nitrogen by air separation, and then synthesizing ammonia through the Haber process. This technology is called "green ammonia production" or "renewable ammonia", aiming to reduce carbon emissions generated in the traditional ammonia production process by using renewable energy throughout the process. The green ammonia synthesis device is affected by the volatility of new energy power such as wind and light, and there will be a long low-load operation interval. The catalyst uses an iron-based catalyst. During low-load operation and startup, the catalyst activity is low, thus affecting the production efficiency of ammonia synthesis. There are two operating conditions. One is that the temperature of the raw material gas is relatively low during startup, and a large amount of heat needs to be supplemented in a short time. The other is that a small amount of heat needs to be supplemented for a long time under low-load operation conditions (10%-35%). It is urgent for those skilled in the art to propose a green ammonia synthesis system that can supplement heat to activate or maintain the catalyst activity. Content of the Utility Model
[0003] In view of this, the utility model provides a green ammonia synthesis system with flexible heat supplement to solve the above problems.
[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0005] A green ammonia synthesis system with flexible heat supplement includes: a syngas mixer, a first pipeline, a second pipeline, a third pipeline, a startup electric furnace, an ammonia synthesis tower, a fourth pipeline, a boiler water heat exchange device, a heat exchanger, a fifth pipeline, a cooling device, an ammonia separator and a liquid nitrogen storage tank. The syngas mixer is connected to the heat exchanger through the first pipeline, the heat exchanger is connected to the top of the ammonia synthesis tower through the second pipeline, one end of the third pipeline is connected to the second pipeline through a tee, and the other end is connected to the top of the ammonia synthesis tower. The startup electric furnace is installed on the third pipeline. One end of the fourth pipeline is connected to the bottom of the ammonia synthesis tower, and the other end is connected to the heat exchanger. The boiler water heat exchange device is installed on the fourth pipeline. One end of the fifth pipeline is connected to the heat exchanger, and the other end is connected to the ammonia separator. The cooling device is installed on the fifth pipeline. The ammonia separator is connected to the liquid nitrogen storage tank through a pipeline;
[0006] The cooling device includes a cold exchanger, a sixth pipeline and a seventh pipeline. The cold exchanger is installed on the fifth pipeline. One end of the sixth pipeline is connected to the top of the ammonia separator, and the other end is connected to the cold exchanger. The seventh pipeline is connected to the cold exchanger.
[0007] Further, the boiler water heat exchange device includes a boiler water heat exchanger, a boiler water supply pipeline, and a boiler water return pipeline. The boiler water heat exchanger is installed on the fourth pipeline. One end of the boiler water supply pipeline is connected to the boiler, and the other end is connected to the boiler water heat exchanger. One end of the boiler water return pipeline is connected to the boiler water heat exchanger, and the other end is connected to the boiler.
[0008] Further, the cooling device further includes an ammonia cooler, which is installed on the fifth pipeline.
[0009] Further, one end of the seventh pipeline is connected to the cold exchanger, and the other end is connected to the syngas mixer.
[0010] Further, the cooling device further includes an ammonia synthesis water cooler, which is installed on the fifth pipeline and is located before the cold exchanger.
[0011] The beneficial effects of the present utility model are as follows:
[0012] When the working conditions of the present utility model are operating normally, the start-up electric furnace does not need to provide heat to the ammonia synthesis tower; in the low-load operating conditions of the ammonia synthesis tower, the start-up electric furnace is used to heat the ammonia synthesis mixed gas, and the ammonia synthesis mixed gas enters the ammonia synthesis tower for rapid heat compensation; it is also possible to use the waste heat of the boiler water to heat the mixed gas after ammonia synthesis by the boiler water heat exchanger. The heated ammonia synthesis mixer uses the heat exchanger to heat the ammonia synthesis mixed gas, and then enters the ammonia synthesis tower for heat compensation; it is also possible to simultaneously turn on the start-up electric furnace and the boiler water heat exchanger to heat the ammonia synthesis mixed gas, realizing flexible heat compensation for the ammonia synthesis tower. Description of the Drawings
[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.
[0014] Figure 1 It is a structural schematic diagram of a green ammonia synthesis system with flexible heat compensation;
[0015] Among them, in the figure:
[0016] 1 - Syngas mixer, 2 - First pipeline, 3 - Second pipeline, 4 - Third pipeline, 5 - Start-up electric furnace, 6 - Ammonia synthesis tower, 7 - Fourth pipeline, 8 - Heat exchanger, 9 - Fifth pipeline, 10 - Ammonia separator, 11 - Liquid nitrogen storage tank, 12 - Boiler water heat exchanger, 13 - Boiler water feed pipeline, 14 - Boiler water return pipeline, 15 - Ammonia cooler, 16 - Cold exchanger, 17 - Sixth pipeline, 18 - Seventh pipeline, 19 - Ammonia synthesis water cooler, 20 - Boiler. Detailed implementation manner
[0017] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0018] Referring to the attached Figure 1 As shown, the present invention provides a green ammonia synthesis system with flexible heat supplement, including: a syngas mixer 1, a first pipeline 2, a second pipeline 3, a third pipeline 4, a start-up electric furnace 5, an ammonia synthesis tower 6, a fourth pipeline 7, a boiler water heat exchange device, a heat exchanger 8, a fifth pipeline 9, a cooling device, an ammonia separator 10 and a liquid nitrogen storage tank 11. The syngas mixer 1 is connected to the heat exchanger 8 through the first pipeline 2. The heat exchanger 8 is connected to the top of the ammonia synthesis tower 6 through the second pipeline 3. One end of the third pipeline 4 is connected to the second pipeline 3 through a tee, and the other end is connected to the top of the ammonia synthesis tower 6. The start-up electric furnace 5 is installed on the third pipeline 4. One end of the fourth pipeline 7 is connected to the bottom of the ammonia synthesis tower 6, and the other end is connected to the heat exchanger 8. The boiler water heat exchange device is installed on the fourth pipeline 7. One end of the fifth pipeline 9 is connected to the heat exchanger 8, and the other end is connected to the ammonia separator 10. The cooling device is installed on the fifth pipeline 9. The ammonia separator 10 is connected to the liquid nitrogen storage tank 11 through a pipeline.
[0019] The ammonia synthesis gas mixture in the syngas mixer 1 enters the heat exchanger 8 through the first pipeline 2. At the same time, the heat-carrying ammonia gas mixture output from the bottom end of the ammonia synthesis tower 6 enters the heat exchanger 8 through the fourth pipeline 7. The ammonia synthesis gas mixture and the ammonia gas mixture exchange heat in the heat exchanger 8. After that, the ammonia synthesis gas mixture enters the ammonia synthesis tower 6 through the second pipeline 3 to heat the catalyst and carry out ammonia synthesis. When starting up or operating at low load, the temperature of the ammonia synthesis gas mixture is relatively low, and a large amount of heat needs to be supplemented in a short time. The ammonia synthesis gas mixture can enter the start-up electric furnace 5 through the third pipeline 4 for rapid heating, and then enter the ammonia synthesis tower 6 to heat the catalyst and carry out ammonia synthesis. The ammonia synthesis tower 6 outputs the produced ammonia gas mixture through the fourth pipeline 7. When passing through the fourth pipeline 7, the ammonia gas mixture is heated by using the preheating of the boiler water in the boiler water heat exchange device. The heated ammonia gas mixture heats the ammonia synthesis gas mixture in the heat exchanger 8, and so on in a cycle.
[0020] Specifically, when the working condition operates normally, the start-up electric furnace 5 does not need to provide heat to the ammonia synthesis tower 6; in the low-load operation condition of the ammonia synthesis tower 6, the start-up electric furnace 5 is used to heat the ammonia synthesis gas mixture, and the ammonia synthesis gas mixture enters the ammonia synthesis tower 6 for rapid heat supplement; the waste heat of the boiler water can also be used to exchange heat for the generated ammonia gas mixture by using the boiler water heat exchange device. After heating, the ammonia synthesis mixer uses the heat exchanger 8 to exchange heat for the ammonia synthesis gas mixture, and then enters the ammonia synthesis tower 6 for heat supplement; the start-up electric furnace 5 and the boiler water heat exchanger can also be started simultaneously to heat the ammonia synthesis gas mixture to achieve flexible heat supplement for the ammonia synthesis tower 6.
[0021] Preferably, in an embodiment, the boiler water heat exchange device includes a boiler water heat exchanger 12, a boiler water supply pipeline 13 and a boiler water return pipeline 14. The boiler water heat exchanger 12 is installed on the fourth pipeline 7. One end of the boiler water supply pipeline 13 is connected to the boiler 20, and the other end is connected to the boiler water heat exchanger 12. One end of the boiler water return pipeline 14 is connected to the boiler water heat exchanger 12, and the other end is connected to the boiler 20.
[0022] Preferably, in an embodiment, the cooling device includes an ammonia cooler 15. The ammonia cooler 15 is installed on the fifth pipeline 9. The ammonia cooler 15 cools the ammonia gas mixture for entering the ammonia separator 10 to realize the separation of liquid ammonia from hydrogen and nitrogen through gas-liquid separation.
[0023] Preferably, in an embodiment, the cooling device further includes a cold exchanger 16, a sixth pipeline 17, and a seventh pipeline 18. The cold exchanger 16 is installed on the fifth pipeline 9, before the ammonia cooler 15. One end of the sixth pipeline 17 communicates with the top of the ammonia separator 10, and the other end communicates with the cold exchanger 16. One end of the seventh pipeline 18 communicates with the cold exchanger 16, and the other end communicates with the syngas mixer 1. The ammonia mixture gas comes out of the heat exchanger 8 and enters the fifth pipeline 9, and then enters the cold exchanger 16. At the same time, the low-temperature nitrogen and hydrogen mixture gas is separated in the ammonia separator 10. The low-temperature nitrogen and hydrogen mixture gas enters the cold exchanger 16 through the sixth pipeline 17. The low-temperature nitrogen and hydrogen mixture gas provides cold energy for the ammonia mixture gas. The temperature of the ammonia mixture gas decreases and enters the ammonia cooler 15 for further cooling. The temperature of the nitrogen and hydrogen increases and enters the syngas mixer 1 again through the seventh pipeline 18 for the synthetic ammonia cycle again.
[0024] Preferably, in an embodiment, the cooling device further includes an ammonia synthesis water cooler 19. The ammonia synthesis water cooler 19 is installed on the fifth pipeline 9, before the cold exchanger 16. The ammonia synthesis water cooler 19 pre-cools the ammonia mixture gas before it enters the cold exchanger 16. Both the ammonia synthesis water cooler 19 and the cold exchanger 16 gradually pre-cool the ammonia mixture gas before it enters the ammonia cooler, improving the cooling efficiency.
[0025] In this specification, the various embodiments are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description in the method part.
[0026] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A green ammonia synthesis system with flexible heat supplementation, characterized in that: include: A synthesis gas mixer (1), a first pipeline (2), a second pipeline (3), a third pipeline (4), a start-up electric furnace (5), an ammonia synthesis tower (6), a fourth pipeline (7), a boiler water heat exchange device, a heat exchanger (8), a fifth pipeline (9), a cooling device, an ammonia separator (10) and a liquid nitrogen storage tank (11), wherein the synthesis gas mixer (1) is connected to the heat exchanger (8) through the first pipeline (2), the heat exchanger (8) is connected to the top of the ammonia synthesis tower (6) through the second pipeline (3), and one end of the third pipeline (4) is connected to the second pipeline (6) through a tee. 3), the other end of which is in communication with the top of the ammonia synthesis tower (6), the start-up electric furnace (5) is installed on the third pipeline (4), one end of the fourth pipeline (7) is in communication with the bottom of the ammonia synthesis tower (6), and the other end is in communication with the heat exchanger (8), the boiler water heat exchange device is installed on the fourth pipeline (7), one end of the fifth pipeline (9) is in communication with the heat exchanger (8), and the other end is in communication with the ammonia separator (10), the cooling device is installed on the fifth pipeline (9), and the ammonia separator (10) is in communication with the liquid nitrogen storage tank (11) pipeline; The cooling device comprises a cold exchanger (16), a sixth pipeline (17) and a seventh pipeline (18); the cold exchanger (16) is installed on the fifth pipeline (9); one end of the sixth pipeline (17) is connected to the top end of the ammonia separator (10), and the other end is connected to the cold exchanger (16); the seventh pipeline (18) is connected to the cold exchanger (16).
2. A green ammonia synthesis system with flexible heat supplementation according to claim 1, characterized in that: The boiler water heat exchange device comprises a boiler water heat exchanger (12), a boiler water feed pipeline (13) and a boiler water return pipeline (14); the boiler water heat exchanger (12) is installed on the fourth pipeline (7); one end of the boiler water feed pipeline (13) is connected to the boiler (20) and the other end is connected to the boiler water heat exchanger (12); one end of the boiler water return pipeline (14) is connected to the boiler water heat exchanger (12) and the other end is connected to the boiler (20).
3. A green ammonia synthesis system with flexible heat supplementation according to claim 1, characterized in that: The cooling device further comprises an ammonia cooler (15), and the ammonia cooler (15) is installed on the fifth pipeline (9).
4. The green ammonia synthesis system with flexible heat supplementation according to claim 1, characterized in that: One end of the seventh pipeline (18) is connected to the cold exchanger (16), and the other end is connected to the synthesis gas mixer (1).
5. A green ammonia synthesis system with flexible heat supplementation according to claim 4, characterized in that: The cooling device further comprises an ammonia synthesis water cooler (19), which is installed on the fifth pipeline (9) and located before the cold exchanger (16).