Pure terephthalic acid (PTA) powder conveying nitrogen recycling device

Abstract

The utility model belongs to the technical field of PTA (pure terephthalic acid) powder conveying nitrogen recycling, and discloses a PTA powder conveying nitrogen recycling device which comprises a screw compressor unit, a rotary valve, a stock bin, a bag type dust collector, a basket type filter and a compressor inlet cooler. The rotary valve is communicated with the stock bin, the bag filter is installed on the stock bin through a flange, the bag filter is connected with the basket filter through a pipeline, the basket filter is connected with the compressor inlet cooler through a pipeline, and nitrogen for conveying powder serves as circulating nitrogen to be fed into the system again. The conveyed nitrogen needs to pass through the bag type dust collector and the basket type filter to filter dust carried in the conveyed nitrogen after conveying powder, and the nitrogen recycling device has the advantages that the nitrogen can be recycled, the use of fresh nitrogen is effectively reduced, and the operation cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of nitrogen recovery and utilization technology for PTA powder conveying, specifically a PTA powder conveying nitrogen recovery and utilization device. Background Technology

[0002] The silo is located at the top of the unit, and the powder is transported to the rotary valve via tank trucks. Nitrogen gas is used to pump the material into the silo, and the nitrogen pressure is reduced after the pumping is complete. Subsequently, the material undergoes dust removal treatment through a bag filter and is finally discharged into the atmosphere through a vent pipeline.

[0003] The applicant is a large-scale chemical production enterprise. In order to better save energy, the applicant has modified the existing conveying system. By using a nitrogen circulation device, the use of fresh hydrogen has been reduced, meeting the needs of chemical production. The modification of the existing pneumatic conveying system has achieved good energy-saving results.

[0004] Currently, powder materials mainly rely on nitrogen as the transport gas. Fresh nitrogen is expensive, and there is also a risk of dust pollution when emitted into the atmosphere. In contrast, using a nitrogen circulation device can effectively reduce the use of fresh nitrogen and reduce operating costs.

[0005] Therefore, a nitrogen recovery and utilization device for PTA powder conveying is proposed to address the above problems. Utility Model Content

[0006] To address the problems mentioned in the background art, this utility model provides a nitrogen recovery and utilization device for PTA powder conveying, which has the advantages of being able to recover and recycle nitrogen, effectively reducing the use of fresh nitrogen and effectively reducing operating costs.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a nitrogen recovery and utilization device for PTA powder conveying, comprising a screw compressor unit, a rotary valve, a silo, a bag filter, a basket filter, and a compressor inlet cooler. The screw compressor unit is connected to the rotary valve via a pipeline, the rotary valve is connected to the silo, the bag filter is mounted on the silo via a flange, the bag filter is connected to the basket filter via a pipeline, and the basket filter is connected to the compressor inlet cooler via a pipeline.

[0008] Preferably, the nitrogen used to transport the powder is recycled back into the system as circulating nitrogen, reducing the use of fresh nitrogen in the system.

[0009] Preferably, the nitrogen gas used to transport the powder needs to pass through the bag filter and the basket filter to remove the dust carried in the transport gas.

[0010] Preferably, the circulating nitrogen gas passes through the compressor inlet cooler before entering the screw compressor unit to reduce the nitrogen temperature and increase the gas compression ratio.

[0011] Preferably, the screw compressor unit is provided with a gas supply line and a vent line at the inlet for replacement in case of screw compressor unit failure.

[0012] Preferably, the second air supply line and the exhaust line installed before the compressor inlet cooler are used for system replacement before conveying powder materials.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This invention modifies the process by introducing nitrogen through two pipelines—an exhaust pipeline and a makeup gas pipeline—to replace the air in the system pipelines. Then, the screw compressor unit is started, circulating the nitrogen within the system. Material from the tanker is transported to the silo via a rotary valve. After transport, the nitrogen is filtered through a bag filter and a basket filter, then cooled by the compressor inlet cooler, and finally re-enters the screw compressor unit for compression, thus recycling the nitrogen. This significantly reduces the use of fresh nitrogen and decreases nitrogen emissions into the atmosphere. In practical applications, this method demonstrates excellent results, achieving the goals of energy conservation and environmental protection. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the screw compressor unit and rotary valve of this utility model;

[0017] Figure 3 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 4 This is a schematic diagram of the screw compressor unit and compressor inlet cooler of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the silo and bag filter of this utility model.

[0020] In the diagram: 1. Screw compressor unit; 2. Rotary valve; 3. Hopper; 4. Bag filter; 5. Basket filter; 6. Compressor inlet cooler; 7. Make-up air line 1; 8. Vent line; 9. Make-up air line 2; 10. Exhaust line. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1 to 5 As shown, this utility model provides a nitrogen recovery and utilization device for PTA powder conveying, including a screw compressor unit 1, a rotary valve 2, a silo 3, a bag filter 4, a basket filter 5, and a compressor inlet cooler 6. The compressor unit 1 is connected to the rotary valve 2 through a pipeline, the rotary valve 2 is connected to the silo 3, the bag filter 4 is installed on the silo 3 through a flange, the bag filter 4 is connected to the basket filter 5 through a pipeline, and the basket filter 5 is connected to the compressor inlet cooler 6 through a pipeline.

[0023] Specifically, the nitrogen used to transport the powder is recycled back into the system, reducing the use of fresh nitrogen in the system.

[0024] like Figures 1 to 5 As shown, the nitrogen gas used to transport the powder needs to pass through a bag filter 4 and a basket filter 5 to filter out the dust carried in the transport gas.

[0025] Furthermore, before entering the screw compressor unit 1, the circulating nitrogen gas passes through the compressor inlet cooler 6 to reduce the nitrogen temperature and increase the gas compression ratio.

[0026] like Figures 1 to 5 As shown, the screw compressor unit 1 is equipped with a make-up air line 7 and a vent line 8 at the inlet for replacement in case of screw compressor unit 1 failure.

[0027] It is worth noting that the make-up air line 2 9 and the exhaust line 10 installed before the compressor inlet cooler 6 are used for system replacement before conveying powder materials.

[0028] Working principle and process: Nitrogen is introduced through exhaust line 10 and make-up air line 9 to replace the air in the system pipelines. Then, the screw compressor unit 1 is started to circulate the nitrogen in the system. Material from the tanker is transported to the silo via rotary valve 2. After transport, the nitrogen is filtered through bag filter 4 and basket filter 5, then cooled by compressor inlet cooler 6, and finally re-enters the screw compressor unit 1 for compression, thus recycling the nitrogen.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nitrogen recovery and utilization device for PTA powder conveying, characterized in that: The system includes a screw compressor unit (1), a rotary valve (2), a hopper (3), a bag filter (4), a basket filter (5), and a compressor inlet cooler (6). The screw compressor unit (1) is connected to the rotary valve (2) via a pipeline. The rotary valve (2) is connected to the hopper (3). The bag filter (4) is installed on the hopper (3) via a flange. The bag filter (4) is connected to the basket filter (5) via a pipeline. The basket filter (5) is connected to the compressor inlet cooler (6) via a pipeline.

2. The PTA powder conveying nitrogen recovery and utilization device according to claim 1, characterized in that: The nitrogen used to transport the powder is recycled back into the system, reducing the use of fresh nitrogen in the system.

3. The PTA powder conveying nitrogen recovery and utilization device according to claim 1, characterized in that: After the nitrogen gas is used to transport the powder, it needs to pass through the bag filter (4) and the basket filter (5) to filter the dust carried in the transport gas.

4. The PTA powder conveying nitrogen recovery and utilization device according to claim 1, characterized in that: Before entering the screw compressor unit (1), the circulating nitrogen gas passes through the compressor inlet cooler (6) to reduce the nitrogen temperature and increase the gas compression ratio.

5. The PTA powder conveying nitrogen recovery and utilization device according to claim 1, characterized in that: The screw compressor unit (1) is equipped with a gas supply line (7) and a vent line (8) at the inlet for replacement in case of failure of the screw compressor unit (1).

6. The PTA powder conveying nitrogen recovery and utilization device according to claim 1, characterized in that: The make-up air line (9) and the exhaust line (10) installed before the compressor inlet cooler (6) are used for system replacement before conveying powder.

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