Drying system for terephthalic acid production

Abstract

The utility model discloses a drying system for terephthalic acid production, which comprises a crystallizer, a filtering machine, a drying machine, a condensate tank and a pulping tank, two guide pipes are arranged on the surface of the crystallizer, and the two guide pipes of the crystallizer are respectively connected with steam tubes of the filtering machine and the drying machine. A drying machine chimney and a drying machine feeding screw are arranged between the filtering machine and the drying machine, the filtering machine and the drying machine are communicated with each other through the drying machine chimney and the drying machine feeding screw, guide pipes are arranged among the drying machine, the liquid condensation tank and the pulping tank, and the drying machine, the liquid condensation tank and the pulping tank are communicated with each other through the guide pipes. Through the structure, the use amount of 0.35 MPa steam is reduced, introduction of process water and discharge of waste water are reduced, the overall consumption of the device is reduced, the heat of the process steam of the device is recovered, and the process advancement and industry competitiveness of the device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of terephthalic acid production, in particular to a drying system for terephthalic acid production. Background Art

[0002] The drying systems commonly used in terephthalic acid production currently require the use of large amounts of 0.35 MPa steam and process water during use, and require the discharge of large amounts of wastewater. This increases the cost of terephthalic acid production and reduces the practicality of the drying systems used in terephthalic acid production. To achieve the goal of energy conservation and consumption reduction, the applicant has made corresponding improvements to the existing equipment, which can completely overcome the problems existing in the existing technology, require less investment in the transformation process, and have stronger practicality. Utility Model Content

[0003] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and to provide a drying system for terephthalic acid production, which recovers the heat of the process steam of the device, reduces the use of 0.35MPa steam, and at the same time reduces the introduction of process water and the discharge of wastewater, thereby reducing the overall consumption of the device and improving the process advancement and industry competitiveness of the device.

[0004] The utility model also provides a drying system for terephthalic acid production, comprising: a crystallizer, a filter, a dryer, a condensate tank, and a beating tank. Two conduits are provided on the surface of the crystallizer, and the two conduits of the crystallizer are respectively connected to the steam tubes of the filter and the dryer. A dryer chimney and a dryer feed screw are provided between the filter and the dryer, and the filter and the dryer are interconnected through the dryer chimney and the dryer feed screw. A conduit is provided between the dryer, the condensate tank, and the beating tank, and the dryer, the condensate tank, and the beating tank are interconnected through the conduit.

[0005] According to the drying system for terephthalic acid production described in the utility model, the conduit between the crystallizer and the dryer is a steam transmission passage, and the conduit between the crystallizer and the dryer is provided with a pneumatic valve, which facilitates improving the humidity of the articles discharged from the dryer.

[0006] According to the drying system for terephthalic acid production disclosed herein, the crystallizer, filter, dryer, condensate tank, and pulping tank are interconnected via a conduit, a dryer chimney, and a dryer feed screw to form a main conveying passage, facilitating maintenance of the drying system's conveying passage.

[0007] According to the drying system for terephthalic acid production described in the utility model, the dryer is a rotary steam arrangement type refining dryer, and the surface of the dryer is provided with multiple concentric rows of tubes, thereby improving the convenience of the dryer maintenance.

[0008] According to the drying system for terephthalic acid production described in the utility model, two dryers are provided, and the two dryers form a refining section, thereby improving the working effect of the dryers.

[0009] According to the drying system for terephthalic acid production described in the utility model, the conduit between the crystallizer and the filter, and the conduit between the condensate tank and the beating tank are respectively provided with a filter feed pump and a condensate delivery pump, thereby improving the smoothness of conveying objects in the drying system.

[0010] Beneficial effects:

[0011] 1. Compared with the prior art, the drying system for terephthalic acid production uses a rotary steam tubular dryer through a crystallizer, a filter feed pump, a filter, a dryer chimney, a dryer feed screw, a dryer, a condensate tank, a condensate pump, and a beating tank, and utilizes 0.35 MPa low-pressure steam for indirect heating and drying treatment, thereby reducing the level of steam generated in the condensation process. This achieves the goal of saving 40 tons of 0.35 MPa low-pressure steam per hour, 40 tons of process water per hour, and 40 tons of wastewater discharge per hour during the operation of the drying system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0013] Figure 1 This is a work flow structure diagram of a drying system for terephthalic acid production according to the utility model.

[0014] Legend:

[0015] 1. Crystallizer; 2. Filter feed pump; 3. Filter; 4. Dryer chimney; 5. Dryer feed screw; 6. Dryer; 7. Condensate tank; 8. Condensate pump; 9. Beating tank. DETAILED DESCRIPTION

[0016] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0017] Reference Figure 1The embodiment of the present invention is a drying system for terephthalic acid production, which includes: a crystallizer 1, a filter 3, a dryer 6, a condensate tank 7, and a beating tank 9. Two conduits are provided on the surface of the crystallizer 1, and the two conduits of the crystallizer 1 are respectively connected to the steam tubes of the filter 3 and the dryer 6. A dryer chimney 4 and a dryer feeding screw 5 are provided between the filter 3 and the dryer 6. The filter 3 and the dryer 6 are interconnected through the dryer chimney 4 and the dryer feeding screw 5. A conduit is provided between the dryer 6, the condensate tank 7, and the beating tank 9. The dryer 6, the condensate tank 7, and the beating tank 9 are interconnected through the conduit. The above devices cooperate with each other to form the basic structure of the drying system.

[0018] The conduit between the crystallizer 1 and the dryer 6 is a steam conveying passage, and the conduit between the crystallizer 1 and the dryer 6 is provided with a pneumatic valve. The steam conveying passage is used to control the dryer 6 to discharge the material to provide moisture, ensuring that the moisture content of the discharge of the dryer 6 is less than 0.2%. The crystallizer 1, filter 3, dryer 6, condensate tank 7, and beating tank 9 are interconnected through the conduit, dryer chimney 4, and dryer feed screw 5 to form a main conveying passage. The main conveying passage is the processing order of material processing. The conduit between the crystallizer 1 and the filter 3, and the conduit between the condensate tank 7 and the beating tank 9 are respectively provided with a filter feed conveying pump 2 and a condensate conveying pump 8. The filter feed conveying pump 2 and the condensate conveying pump 8 are used to provide sufficient feeding power for the material in the main conveying passage, thereby improving the working smoothness of the drying system.

[0019] The dryer 6 is a rotary steam arrangement type refining dryer, and the surface of the dryer 6 is provided with multiple concentric rows of tubes. Two dryers 6 are provided, and the two dryers 6 form a refining section. When the two dryers 6 are in operation, the steam consumption of each dryer 6 is about 15-20 tons / hour. The dryer 6 dries the PTA filter cake with a moisture content of 7.5% (w / w) from the filter 3 to make it into PTA powder with a moisture content of ≤0.2% (w / w), and then sends it to the product silo for storage.

[0020] Working principle: The crystallizer 1 is heated by introducing 0.45MPa process flash steam into the steam tubes of the dryer 6 through the steam transmission path to maintain the moisture content of the dryer 6 discharge material less than 0.2%, and the condensed condensate is recovered to the condensate tank 7, and then the condensate is transported to the pulping tank 9 by the condensate delivery pump 8, and the process water supply flow of the pulping tank 9 is reduced to maintain the water balance of the system. At the same time, the oxidation device reduces the output of the process water system, reduces the supply of desalted water, and reduces the external drainage of the device. The 0.35MPa steam saved by the dryer 6 can be used for power generation of the air compressor and supply of high-pressure steam.

[0021] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A drying system for terephthalic acid production, characterized in that: include: A crystallizer (1), a filter (3), a dryer (6), a condensate tank (7), and a beating tank (9); two conduits are provided on the surface of the crystallizer (1); the two conduits of the crystallizer (1) are respectively connected to the steam tubes of the filter (3) and the dryer (6); a dryer chimney (4) and a dryer feed screw (5) are provided between the filter (3) and the dryer (6); the filter (3) and the dryer (6) are interconnected through the dryer chimney (4) and the dryer feed screw (5); a conduit is provided between the dryer (6), the condensate tank (7), and the beating tank (9); the dryer (6), the condensate tank (7), and the beating tank (9) are interconnected through the conduit.

2. A drying system for terephthalic acid production according to claim 1, characterized in that: The conduit between the crystallizer (1) and the dryer (6) is a steam delivery passage, and the conduit between the crystallizer (1) and the dryer (6) is provided with a pneumatic valve.

3. The drying system for terephthalic acid production according to claim 1, characterized in that: The crystallizer (1), filter (3), dryer (6), condensate tank (7), and beating tank (9) are interconnected through a conduit, a dryer chimney (4), and a dryer feed screw (5) to form a main conveying passage.

4. The drying system for terephthalic acid production according to claim 1, characterized in that: The dryer (6) is a rotary steam arrangement type refining dryer, and the surface of the dryer (6) is provided with concentric multiple rows of tubes.

5. The drying system for terephthalic acid production according to claim 1, characterized in that: Two dryers (6) are provided, and the two dryers (6) form a refining section.

6. The drying system for terephthalic acid production according to claim 1, characterized in that: The conduit between the crystallizer (1) and the filter (3), and the conduit between the condensate tank (7) and the beating tank (9) are respectively provided with a filter feed pump (2) and a condensate delivery pump (8).

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