A high-capacity desulfurization system adapted to CNG station construction
Patent Information
- Application Number
- CN202522647678.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-15
AI Technical Summary
[0002]天然气脱硫是通过化学及物理方法去除天然气中硫化氢、硫醇等含硫化合物的净化工艺，旨在降低管道腐蚀风险及减少环境污染，现有的脱硫系统脱硫过程复杂，脱硫效果差，因此需要一种高质量高效的脱硫系统
[0008]本实用新型的有益效果是：本实用新型通过分离器、吸收塔、再生塔和重沸器一系列处理，高效高质量的完成天然气脱硫工作。
Smart Images
Figure CN224901232U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of desulfurization system technology, specifically to a high-capacity desulfurization system adapted to the construction of CNG stations. Background Technology
[0002] Natural gas desulfurization is a purification process that removes sulfur-containing compounds such as hydrogen sulfide and mercaptans from natural gas using chemical and physical methods. It aims to reduce the risk of pipeline corrosion and reduce environmental pollution. Existing desulfurization systems have complex desulfurization processes and poor desulfurization effects, so a high-quality and efficient desulfurization system is needed. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a high-capacity desulfurization system that is suitable for the construction of CNG stations, which can efficiently and effectively complete the natural gas desulfurization work.
[0004] To address the problems existing in the background technology, this utility model adopts the following technical solution: It includes a natural gas inlet pipe, a feed gas separator, an absorption tower, a regeneration tower, and a reboiler. The natural gas inlet pipe is connected to the feed gas separator. The bottom of the feed gas separator has a feed outlet pipe. The top of the feed gas separator is connected to the absorption tower via a pipe. The top of the absorption tower is connected to a purified gas separator via a pipe. The purified gas separator has a purified gas pipe. The absorption tower is connected to a flash tank via a pipe. The top of the flash tank has a flash vapor outlet pipe. The flash tank is connected to a heat exchanger via a pipe. The heat exchanger is connected to the regeneration tower via a pipe. The bottom of the regeneration tower is connected to the bottom of the reboiler via a pipe. The bottom of the reboiler is connected to a saturated steam inlet pipe. The top of the reboiler is connected to the regeneration tower via a pipe. The bottom of the reboiler is connected to the heat exchanger via a pipe. The heat exchanger is connected to a cooler via a pipe. The cooler is connected to the absorption tower via a pipe. The top of the regeneration tower is connected to a condenser via a pipe. The condenser is connected to a reflux tank via a pipe. The top of the reflux tank has an acid gas outlet pipe. The bottom of the reflux tank is connected to the regeneration tower via a pipe.
[0005] A booster pump is installed on the pipeline between the reboiler and the heat exchanger.
[0006] A regenerated amine liquid pump is installed on the pipeline between the cooler and the absorption tower.
[0007] A reflux pump is installed on the pipeline between the reflux tank and the regeneration tower.
[0008] The beneficial effects of this utility model are: through a series of processes including separator, absorption tower, regeneration tower and reboiler, this utility model can efficiently and effectively complete the desulfurization of natural gas. Attached Figure Description
[0009] Figure 1 This is a system diagram of this utility model. Detailed Implementation
[0010] Reference Figure 1 The present invention specifically adopts the following implementation method: It includes a natural gas inlet pipe 1, a raw material gas separator 3, an absorption tower 6, a regeneration tower 12, and a reboiler 15. The natural gas inlet pipe 1 is connected to the raw material gas separator 3. The bottom of the raw material gas separator 3 is provided with a raw material outlet pipe 2. The top of the raw material gas separator 3 is connected to the absorption tower 6 through a pipe. The top of the absorption tower 6 is connected to the purified gas separator 5 through a pipe. The purified gas separator 5 is provided with a purified gas pipe 4. The absorption tower 6 is connected to a flash tank 8 through a pipe. The top of the flash tank 8 is provided with a flash vapor outlet pipe 9. The flash tank 8 is connected to a heat exchanger 11 through a pipe. The heat exchanger 11 is connected to... A pipeline connects to regeneration tower 12. The bottom of regeneration tower 12 is connected to the bottom of reboiler 15 via a pipeline. The bottom of reboiler 15 is connected to saturated steam inlet pipe 16. The top of reboiler 15 is connected to regeneration tower 12 via a pipeline. The bottom of reboiler 15 is connected to heat exchanger 11 via a pipeline. Heat exchanger 11 is connected to cooler 10 via a pipeline. Cooler 10 is connected to absorption tower 6 via a pipeline. The top of regeneration tower 12 is connected to condenser 13 via a pipeline. Condenser 13 is connected to reflux tank 18 via a pipeline. Reflux tank 18 has an acid gas outlet pipe 19 at its top and a pipeline connecting its bottom to regeneration tower 12. A booster pump 14 is installed on the pipeline between reboiler 15 and heat exchanger 11. A regenerated amine liquid pump 7 is installed on the pipeline between cooler 10 and absorption tower 6. A reflux pump 17 is installed on the pipeline between reflux tank 18 and regeneration tower 12.
[0011] When this high-capacity desulfurization system adapted for CNG plant construction is used, the natural gas mixture enters the feed gas separator 3 through the natural gas inlet pipe 1, while the natural gas enters the absorption tower 6. In the absorption tower 6, amine liquid (such as methyl diethanolamine) undergoes a reversible reaction with acidic gases (H2S and CO2) to remove them from the natural gas. The natural gas with acidic gases removed enters the purified gas separator 5 through a pipeline, and the pure natural gas is finally transported out through the purified gas pipeline. The amine liquid that absorbs acidic gases in the absorption tower 6 enters the flash tank 8 through a pipeline. The core function of the flash tank 8 is to remove hydrocarbon components entrained by the amine liquid through a depressurization flash process. This is because if hydrocarbons enter the subsequent regeneration system with the rich liquid, it will lead to increased regeneration energy consumption, decreased acidic gas quality, and even equipment corrosion or catalyst poisoning. The amine solution after the removal of hydrocarbon components enters the heat exchanger 11 for cooling. After cooling, it enters the regeneration tower 12 for regeneration. The reboiler 15 at the bottom of the regeneration tower 12 is the key equipment in the amine solution regeneration process. Its function is to provide the heat required for the regeneration of the rich amine solution. The specific process is as follows: the desulfurized rich amine solution flows out from the bottom of the regeneration tower 12 and is heated by the reboiler 15, which desorbs the dissolved acidic gases (such as H2S and CO2), thereby realizing the regeneration of the amine solution. The regenerated lean amine solution is then returned to the absorption tower for recycling.
[0012] The reboiler 15 partially vaporizes the rich amine liquid through indirect heating (such as using low-pressure steam or heat transfer oil). The generated steam rises and flows back to the regeneration tower 12, promoting component separation, while the amine liquid desorbs acidic gases due to the increased temperature. This process requires strict control of operating parameters, such as ensuring that the reboiler temperature does not exceed 149°C, to prevent thermal degradation or corrosion of the amine liquid.
[0013] The rich amine solution, after being deacidified by the reboiler 15, becomes a lean solution. The lean solution is then cooled by the booster pump 14 and enters the heat exchanger 11 and cooling gas 10. Finally, it is returned to the absorption tower 6 for reuse via the regenerated amine solution pump 7.
[0014] In summary, this high-capacity desulfurization system adapted for CNG plant construction efficiently and effectively completes natural gas desulfurization through a series of processes including separators, absorption towers, regeneration towers, and reboilers.
Claims
1. A high-capacity desulfurization system adapted to the construction of CNG power plants, characterized in that: The system includes a natural gas inlet pipe (1), a raw material gas separator (3), an absorption tower (6), a regeneration tower (12), and a reboiler (15). The natural gas inlet pipe (1) is connected to the raw material gas separator (3). The bottom of the raw material gas separator (3) is provided with a raw material outlet pipe (2). The top of the raw material gas separator (3) is connected to the absorption tower (6) through a pipe. The top of the absorption tower (6) is connected to the purified gas separator (5) through a pipe. The purified gas separator (5) is provided with a purified gas pipe (4). The absorption tower (6) is connected to the flash tank (8) through a pipe. The top of the flash tank (8) is provided with a flash vapor outlet pipe (9). The flash tank (8) is connected to the heat exchanger (11) through a pipe. The heat exchanger (11) is connected to the regeneration tower (15) through a pipe. 12) Connection: The bottom of the regeneration tower (12) is connected to the bottom of the reboiler (15) through a pipe. The bottom of the reboiler (15) is connected to the saturated steam inlet pipe (16). The top of the reboiler (15) is connected to the regeneration tower (12) through a pipe. The bottom of the reboiler (15) is connected to the heat exchanger (11) through a pipe. The heat exchanger (11) is connected to the cooler (10) through a pipe. The cooler (10) is connected to the absorption tower (6) through a pipe. The top of the regeneration tower (12) is connected to the condenser (13) through a pipe. The condenser (13) is connected to the reflux tank (18) through a pipe. The top of the reflux tank (18) is provided with an acid gas outlet pipe (19). The bottom of the reflux tank (18) is connected to the regeneration tower (12) through a pipe.
2. The high-capacity desulfurization system adapted for CNG plant construction according to claim 1, characterized in that: A booster pump (14) is installed on the pipeline between the reboiler (15) and the heat exchanger (11).
3. The high-capacity desulfurization system adapted for CNG plant construction according to claim 1, characterized in that: A regenerated amine liquid pump (7) is installed on the pipeline between the cooler (10) and the absorption tower (6).
4. A high-capacity desulfurization system adapted for CNG plant construction according to claim 1, characterized in that: A reflux pump (17) is installed on the pipeline between the reflux tank (18) and the regeneration tower (12).