Carbon dioxide compression drying system

Abstract

A carbon dioxide compression and drying system. The conventional carbon dioxide compression and drying is separated, and the regeneration tower needs to be equipped with an additional regeneration gas treatment device, the pipeline is complex, and the maintenance cost is high. The utility model discloses a composition includes: carbon dioxide compressor, separation filter, regeneration tower and drying tower, the carbon dioxide from the regeneration gas gas-liquid separator is compressed through carbon dioxide compressor, and the compressed gas enters the separation filter and filters, the outlet of separation filter is communicated with drying tower through main raw gas pipe, the main raw gas pipe leads a regeneration gas pipeline, the regeneration gas pipeline is divided into hot blowing pipeline and cold blowing pipeline, the hot blowing pipeline is communicated to the regeneration tower, the outlet of regeneration tower is communicated with the gas inlet of pre-drying tower through the pipeline, and the outlet gas of pre-drying tower is communicated with the regeneration outlet gas pipeline through the pre-drying gas pipe. The utility model is used for carbon dioxide compression and drying.

Description

Technical Field

[0001] This utility model relates to a carbon dioxide compression drying system. Background Technology

[0002] In industrial production and gas applications, carbon dioxide, as an important gas, often requires compression and drying. With the increasing demand for carbon dioxide utilization, such as in food preservation, beverage carbonation, chemical synthesis, and welding protection, the requirements for the purity and dryness of carbon dioxide are becoming increasingly stringent. However, carbon dioxide captured in thermal power plants does not meet these requirements.

[0003] Traditional carbon dioxide compression and drying are separate processes. Regeneration towers require additional regeneration gas processing equipment, resulting in complex pipelines, high maintenance costs, and regeneration relying solely on heating (such as hot blowing), without optimizing the cooling process. This leads to long adsorbent regeneration cycles and low adsorbent utilization. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a carbon dioxide compression drying system.

[0005] The above objectives are achieved through the following technical solutions: A carbon dioxide compression drying system comprises: a carbon dioxide compressor, a separation filter, a regeneration tower, and a drying tower. Carbon dioxide from a regeneration gas-liquid separator is compressed by the carbon dioxide compressor, and the compressed gas enters the separation filter for filtration. The outlet of the separation filter is connected to the drying tower via the main raw material gas pipe; A regeneration gas pipeline is led out from the main raw material gas pipeline. The regeneration gas pipeline is divided into a hot blowing pipeline and a cold blowing pipeline. The hot blowing pipeline is connected to the regeneration tower. The outlet of the regeneration tower is connected to the gas port of the pre-drying tower through a pipeline. The gas outlet of the pre-drying tower is connected to the regeneration gas outlet pipeline through the pre-dried gas pipeline. The cold blowing pipeline is connected to the air inlet of the pre-drying tower; The regenerated gas outlet pipeline is connected to the inlet of the regenerated gas cooler of the drying skid, the outlet of the regenerated gas cooler of the drying skid is connected to the regenerated gas separator of the drying skid through a pipeline, and the outlet of the regenerated gas separator of the drying skid is connected to the main raw material gas pipeline through the separated regenerated gas pipeline.

[0006] The aforementioned carbon dioxide compression drying system includes a regenerated gas electric heater installed on the hot blowing pipeline.

[0007] The carbon dioxide compression drying system is provided with isolation valves installed on the cold blowing pipeline, hot blowing pipeline, pre-dried gas pipeline, and regenerated gas outlet pipeline. Beneficial effects

[0008] 1. In this invention, before the filtered carbon dioxide enters the drying tower through the main raw material gas pipe, a regeneration gas pipeline is drawn out as the regeneration gas for the regeneration tower. This eliminates the need for an additional gas treatment system for the regeneration tower, simplifying the system and reducing maintenance costs.

[0009] 2. This utility model is divided into a hot blowing stage and a cold blowing stage. In the hot blowing stage, the heated carbon dioxide enters the regeneration tower from bottom to top, which raises the temperature of the adsorbent and regenerates the saturated molecular sieve bed, allowing the water in it to be desorbed. After the regenerated humid gas is processed by the pre-drying tower and the regeneration gas cooler of the drying skid, the moisture is separated and the dry gas is reintroduced into the main raw material gas pipe, reducing gas loss and recovering heat energy at the same time.

[0010] 3. This utility model is equipped with a cold blowing pipeline, in which room temperature regeneration gas enters the regeneration tower from top to bottom, cooling the molecular sieve bed to room temperature, shortening the regeneration cycle, and avoiding the aging of the adsorbent due to high temperature. The cold blowing gas is also treated and returned to the main raw material gas pipeline to ensure the reuse of carbon dioxide gas. Attached Figure Description

[0011] Appendix Figure 1 This is a schematic diagram of the present invention; In the diagram: 1. Carbon dioxide compressor; 2. Separator filter; 3. Regenerated gas pipeline; 4. Main feed gas pipeline; 5. Regenerated gas cooler on drying skid; 6. Regenerated gas pipeline after separation; 7. Drying tower; 8. Regenerated gas separator on drying skid; 9. Regeneration tower; 10. Regenerated gas electric heater; 11. Cold blowing pipeline; 12. Hot blowing pipeline; 13. Pre-dried gas pipeline; 14. Dried gas outlet pipeline; 15. Isolation valve; 16. Regenerated gas outlet pipeline; 17. Regeneration tower. Detailed Implementation

[0012] Reference Figure 1 A carbon dioxide compression drying system comprises: a carbon dioxide compressor 1, a separation filter 2, a regeneration tower 17, and a drying tower 7. Carbon dioxide from the regeneration gas-liquid separator is compressed by the carbon dioxide compressor, and the compressed gas enters the separation filter for filtration. The outlet of the separation filter is connected to the drying tower via the main raw material gas pipe 4; A regeneration gas pipeline 3 is led out from the main raw material gas pipeline. The regeneration gas pipeline is divided into a hot blowing pipeline 12 and a cold blowing pipeline 11. The hot blowing pipeline is connected to the regeneration tower. The outlet of the regeneration tower is connected to the gas port of the pre-drying tower 9 through a pipeline. The gas outlet of the pre-drying tower is connected to the regeneration outlet pipeline 16 through the pre-dried gas pipeline 13. The cold blowing pipeline is connected to the air inlet of the pre-drying tower; The regenerated gas outlet pipeline is connected to the inlet of the regenerated gas cooler 5 of the drying skid, the outlet of the regenerated gas cooler of the drying skid is connected to the regenerated gas separator 8 of the drying skid through a pipeline, and the outlet of the regenerated gas separator of the drying skid is connected to the main raw material gas pipeline through the regenerated gas pipeline 6 after separation.

[0013] A regenerated gas electric heater 10 is installed on the hot blowing pipeline.

[0014] Isolation valves 15 are installed on the cold blowing pipeline, the hot blowing pipeline, and the pre-dried air pipe, respectively.

[0015] The carbon dioxide from the self-regenerated gas-liquid separator is compressed to 2.2-2.5 MPa by the carbon dioxide compressor, and the compressed gas enters the separation filter for filtration. The compressed carbon dioxide needs to be dried and then liquefied through cooling to obtain a carbon dioxide product that meets the national standard for industrial liquid carbon dioxide (GB / T6052-2011). The drying system adopts a variable-temperature regeneration process, which includes two processes: hot blowing and cold blowing. Before the filtered carbon dioxide enters the drying tower through the main feed gas pipe, a regeneration gas pipeline is drawn off as the regeneration gas. During hot blowing, the regeneration gas enters the regeneration gas electric heater and is heated to the design temperature. The heated carbon dioxide gas enters the regeneration tower from bottom to top, raising the temperature of the adsorbent in the regeneration tower and regenerating the saturated molecular sieve bed, allowing the water in it to be desorbed. The water-rich regeneration gas enters the pre-drying tower, and after being treated in the pre-drying tower, it enters the drying skid regeneration gas cooler for cooling, and then enters the drying skid regeneration gas separator. The regeneration gas after water separation merges with the main feed gas pipe and enters the drying tower for dehydration. During cold blowing, the regenerated gas enters the pre-drying tower for treatment and then enters the regeneration tower from top to bottom to cool the molecular sieve bed to room temperature. The regenerated gas coming out of the regeneration tower is cooled by the regenerated gas cooler on the drying skid. After cooling, it passes through the regenerated gas separator on the drying skid to separate free water. The separated regenerated gas merges with the main raw material gas pipe and enters the drying tower for dehydration.

Claims

1. A carbon dioxide compression drying system, characterized in that: Its components include: a carbon dioxide compressor, a separation filter, a regeneration tower, and a drying tower. The carbon dioxide from the regeneration gas-liquid separator is compressed by the carbon dioxide compressor, and the compressed gas enters the separation filter for filtration. The outlet of the separation filter is connected to the drying tower via the main raw material gas pipe; A regeneration gas pipeline is led out from the main raw material gas pipeline. The regeneration gas pipeline is divided into a hot blowing pipeline and a cold blowing pipeline. The hot blowing pipeline is connected to the regeneration tower. The outlet of the regeneration tower is connected to the gas port of the pre-drying tower through a pipeline. The gas outlet of the pre-drying tower is connected to the regeneration gas outlet pipeline through the pre-dried gas pipeline. The cold blowing pipeline is connected to the air inlet of the pre-drying tower; The regenerated gas outlet pipeline is connected to the inlet of the regenerated gas cooler of the drying skid, the outlet of the regenerated gas cooler of the drying skid is connected to the regenerated gas separator of the drying skid through a pipeline, and the outlet of the regenerated gas separator of the drying skid is connected to the main raw material gas pipeline through the separated regenerated gas pipeline.

2. The carbon dioxide compression drying system according to claim 1, characterized in that: A regenerated gas electric heater is installed on the hot blowing pipeline.

3. The carbon dioxide compression drying system according to claim 2, characterized in that: Isolation valves are installed on the cold blowing pipeline, hot blowing pipeline, pre-dried air pipeline, and regenerated air outlet pipeline, respectively.

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