Single-tower production system of fuming sulfuric acid

Abstract

The utility model discloses a single-tower production system for fuming sulfuric acid, and belongs to the technical field of sulfuric acid production equipment. The device comprises a first-stage fuming sulfuric acid tower, and a bottom discharge port of the first-stage fuming sulfuric acid tower is sequentially connected with a first-stage fuming sulfuric acid circulating tank and a first-stage fuming sulfuric acid cooler through pipelines to form closed-loop circulation; a sulfur trioxide gas inlet is formed in the side part of the first-stage tower, and the tower is filled with ceramic filler so as to improve the gas-liquid contact efficiency. In addition, a redundant second-stage fuming sulfuric acid tower is additionally arranged and connected with a tail gas outlet of the first-stage cooler through a pipeline, the height of a filler layer in the tower is reduced, and an acid mist trapping mechanism is additionally arranged and used for emergency starting and acid mist backflow under the abnormal working condition. Through main operation of the single tower, standby of the redundant secondary tower, pipeline interconnection optimization and filler structure adjustment, the purposes of energy conservation and consumption reduction are achieved, meanwhile, the system resistance is reduced, the operation process is simplified, and the production safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of sulfuric acid production technology, specifically a single-tower production system for fuming sulfuric acid. Background Technology

[0002] Traditional fuming sulfuric acid production systems often employ a two-tower series process, where sulfur trioxide gas is absorbed sequentially through a primary fuming sulfuric acid tower and a secondary fuming sulfuric acid tower to produce fuming sulfuric acid of the target concentration. In this process, the primary tower is used for initial absorption, while the secondary tower handles the further absorption of remaining sulfur trioxide and acid mist capture. However, existing two-tower processes have significant drawbacks:

[0003] (1) High energy consumption: Two sets of circulating pumps (one primary and one secondary 200kW equipment) need to be operated simultaneously. The annual power consumption of a single circulating pump is as high as 1.7 million kWh, and the overall energy consumption of the system is huge.

[0004] (2) Equipment redundancy: The secondary tower needs to be in operation for a long time, resulting in low equipment utilization and increased maintenance costs (such as packing replacement, pump and valve maintenance, etc.).

[0005] (3) Complex operation: The dual towers in series require frequent adjustment of gas velocity, acid temperature and flow parameters, resulting in poor operational stability and high dependence on manual operation.

[0006] (4) High system resistance: The series connection of the two towers leads to an extended gas flow path and the resistance of the packing layer is superimposed, which further increases energy consumption.

[0007] In recent years, although the industry has attempted to improve the absorption capacity of a single tower by optimizing packing efficiency and improving the structure of the acid separator, it has not yet broken through the framework of the dual-tower process and has failed to solve the core problems of equipment redundancy and high energy consumption. In addition, in existing technologies, the secondary towers are mostly used as stationary operating equipment and cannot be flexibly converted into redundant emergency devices, resulting in a lack of rapid response capability of the system under abnormal operating conditions. Summary of the Invention

[0008] The technical problem to be solved by this utility model is to provide a single-tower production system for fuming sulfuric acid, which can not only achieve efficient absorption through a single tower, but also integrate redundant emergency functions, while optimizing pipeline layout and packing structure to reduce energy consumption, simplify operation and improve system stability.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a single-tower production system for fuming sulfuric acid, including a first-stage fuming sulfuric acid tower, wherein the bottom outlet of the first-stage fuming sulfuric acid tower is connected to a first-stage fuming sulfuric acid circulation tank, the outlet of the first-stage fuming sulfuric acid circulation tank is connected to the inlet of the first-stage fuming sulfuric acid cooler, and the outlet of the first-stage fuming sulfuric acid cooler is connected to the top sulfuric acid inlet of the first-stage fuming sulfuric acid tower.

[0010] The side of the primary fuming sulfuric acid tower is also equipped with a sulfur trioxide gas inlet.

[0011] In a preferred embodiment, a secondary fuming sulfuric acid tower is also included, wherein the tail gas outlet at the top of the primary fuming sulfuric acid cooler is connected to the side inlet of the secondary fuming sulfuric acid tower.

[0012] In a preferred embodiment, the bottom outlet of the secondary fuming sulfuric acid tower is connected to the secondary fuming sulfuric acid circulation tank, the outlet of the secondary fuming sulfuric acid circulation tank is connected to the inlet of the secondary fuming sulfuric acid cooler, and the outlet of the secondary fuming sulfuric acid cooler is connected to the top sulfuric acid inlet of the secondary fuming sulfuric acid tower.

[0013] In a preferred embodiment, a branch pipe is provided on the connecting pipeline between the primary fuming sulfuric acid tower and the primary fuming sulfuric acid cooler, and the branch pipe is a primary acid discharge pipeline;

[0014] The connecting pipeline between the secondary fuming sulfuric acid tower and the secondary fuming sulfuric acid cooler is provided with a branch pipeline, which is a secondary acid discharge pipeline.

[0015] In a preferred embodiment, the connecting pipe between the primary fuming sulfuric acid tower and the primary fuming sulfuric acid cooler is provided with a branch pipe that connects to the secondary fuming sulfuric acid circulation tank.

[0016] The connecting pipeline between the secondary fuming sulfuric acid tower and the secondary fuming sulfuric acid cooler is provided with a branch pipeline that connects to the primary fuming sulfuric acid circulation tank.

[0017] In a preferred embodiment, the packing layer inside the primary fuming sulfuric acid tower is made of ceramic packing.

[0018] In a preferred embodiment, the height of the packing layer in the secondary fuming sulfuric acid tower is reduced to 60% of the original packing layer height, and an acid mist collection mechanism is added for returning acid mist to the primary fuming sulfuric acid circulation tank.

[0019] The single-tower production system for fuming sulfuric acid provided by this utility model, by adopting the above-described structure, has the following beneficial effects:

[0020] (1) By discontinuing the regular operation of the secondary fuming sulfuric acid tower and retaining only the primary tower as the main absorption device, the long-term operation of a 200kW circulating pump is directly reduced, saving 1.7 million kWh of electricity per year. At the same time, the packing structure of the primary tower is optimized, and ceramic packing is used to improve the gas-liquid contact efficiency and reduce the system resistance by more than 2 kPa, further reducing the energy consumption of gas transportation.

[0021] (2) In the single tower mode, the equipment maintenance requirements are reduced by 50%, there is no need to frequently adjust the dual tower coordination parameters, the operation complexity is significantly reduced, and the secondary tower is used as a redundant emergency device, which is only temporarily activated under abnormal conditions, extending the service life of the equipment and reducing the frequency of packing replacement and pump and valve maintenance.

[0022] (3) The design of the new branch pipeline realizes the acid liquid interconnection between the primary tower and the secondary tower circulation tank, which can quickly switch the acid liquid path in an emergency to ensure production continuity. In addition, the height of the secondary tower packing layer is reduced to 60% of the original height and an acid mist collection mechanism is added, which not only reduces the resistance of the empty tower, but also captures the returned acid mist to the primary circulation tank, reduces the load of acid mist on downstream equipment, and extends the service life of the demister. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0025] In the diagram: 1. Primary fuming sulfuric acid tower; 2. Secondary fuming sulfuric acid tower; 3. Primary fuming sulfuric acid cooler; 4. Primary fuming sulfuric acid circulation tank; 5. Primary fuming sulfuric acid circulation pump; 6. Secondary fuming sulfuric acid circulation tank; 7. Secondary fuming sulfuric acid circulation pump; 8. Secondary fuming sulfuric acid cooler; 9. Primary acid discharge pipeline; 10. Secondary acid discharge pipeline; 11. Acid mist collection mechanism. Detailed Implementation

[0026] like Figure 1 In the present invention, a single-tower production system for fuming sulfuric acid includes a primary fuming sulfuric acid tower 1, wherein the bottom outlet of the primary fuming sulfuric acid tower 1 is connected to a primary fuming sulfuric acid circulation tank 4, the outlet of the primary fuming sulfuric acid circulation tank 4 is connected to the inlet of a primary fuming sulfuric acid cooler 3, and the outlet of the primary fuming sulfuric acid cooler 3 is connected to the top sulfuric acid inlet of the primary fuming sulfuric acid tower 1.

[0027] The side of the primary fuming sulfuric acid tower 1 is also equipped with a sulfur trioxide gas inlet.

[0028] In a preferred embodiment, a secondary fuming sulfuric acid tower 2 is also included, wherein the tail gas outlet at the top of the primary fuming sulfuric acid cooler 3 is connected to the side inlet of the secondary fuming sulfuric acid tower 2.

[0029] In a preferred embodiment, the bottom outlet of the secondary fuming sulfuric acid tower 2 is connected to the secondary fuming sulfuric acid circulation tank 6, the outlet of the secondary fuming sulfuric acid circulation tank 6 is connected to the inlet of the secondary fuming sulfuric acid cooler 8, and the outlet of the secondary fuming sulfuric acid cooler 8 is connected to the top sulfuric acid inlet of the secondary fuming sulfuric acid tower 2.

[0030] In a preferred embodiment, a branch pipe is provided on the connecting pipeline between the primary fuming sulfuric acid tower 1 and the primary fuming sulfuric acid cooler 3, and the branch pipe is the primary acid discharge pipeline 9;

[0031] A branch pipe is provided on the connecting pipeline between the secondary fuming sulfuric acid tower 2 and the secondary fuming sulfuric acid cooler 8. The branch pipe is the secondary acid discharge pipeline 10.

[0032] In a preferred embodiment, the connecting pipe between the primary fuming sulfuric acid tower 1 and the primary fuming sulfuric acid cooler 3 is provided with a branch pipe connected to the secondary fuming sulfuric acid circulation tank 6;

[0033] The connecting pipe between the secondary fuming sulfuric acid tower 2 and the secondary fuming sulfuric acid cooler 8 is provided with a branch pipe that connects to the primary fuming sulfuric acid circulation tank 4.

[0034] In a preferred embodiment, the packing layer inside the primary fuming sulfuric acid tower 1 is made of ceramic packing.

[0035] In a preferred embodiment, the height of the packing layer in the secondary fuming sulfuric acid tower 2 is reduced to 60% of the original packing layer height, and an acid mist collection mechanism 11 is added for returning acid mist to the primary fuming sulfuric acid circulation tank 4.

[0036] In this utility model:

[0037] A primary acid discharge pipeline 9 is added to the connecting pipeline between primary tower 1 and primary cooler 3, which is used to directly extract fuming sulfuric acid of the target concentration.

[0038] A secondary acid drainage pipeline 10 is added to the connecting pipeline between the secondary tower 2 and the secondary cooler 8 for emergency acid drainage or system cleaning.

[0039] Cross-tower connection branch:

[0040] A branch pipe is provided on the connecting pipe between the primary tower 1 and the primary cooler 3, extending to the secondary circulation tank 6 to achieve acid liquid exchange.

[0041] A branch pipe is provided on the connecting pipe between the secondary tower 2 and the secondary cooler 8, extending to the primary circulation tank 4, to ensure that the acid solution can quickly switch paths under abnormal operating conditions.

[0042] The redundant emergency function of this novel system is implemented using the following scheme:

[0043] Upgrades to Tier 2 Tower 2:

[0044] After the packing layer height is reduced, the resistance of the empty tower is reduced by 30%, while the original circulating pump 6 and cooler 8 are retained and connected to the first-stage tower 1 through a bypass pipeline.

[0045] The acid mist collection mechanism 11 is made of porous ceramic plates and is installed on the top of the packing layer. The collected acid mist is introduced into the primary circulation tank 4 through the return pipe.

[0046] In addition, a pneumatic valve can be installed at the outlet section of the primary acid discharge pipeline 9 to directly connect to the backup storage tank or downstream section, supporting the rapid transfer of acid in emergency situations.

[0047] Using the above solution, during system operation:

[0048] Normal operating conditions: Only the first-stage tower 1 is used. Sulfur trioxide gas enters the tower through the side inlet, is efficiently absorbed by the ceramic packing layer, and the circulating acid solution is cooled by cooler 3 and returned to the top of the tower. Fuming sulfuric acid of the target concentration is collected through the first-stage acid discharge pipeline 9.

[0049] Abnormal operating conditions: If the primary tower 1 fails, open the bypass valve to direct the exhaust gas into the secondary tower 2. At the same time, start the secondary circulation pump 6 to use the reduced packing layer for emergency absorption. The acid solution is returned to the primary circulation tank 4 through the inter-tower branch to maintain production continuity.

Claims

1. A single-tower production system for fuming sulfuric acid, characterized in that: The system includes a primary fuming sulfuric acid tower (1), the bottom outlet of which is connected to a primary fuming sulfuric acid circulation tank (4), the outlet of which is connected to the inlet of a primary fuming sulfuric acid cooler (3), and the outlet of which is connected to the top sulfuric acid inlet of the primary fuming sulfuric acid tower (1). The side of the primary fuming sulfuric acid tower (1) is also provided with a sulfur trioxide gas inlet.

2. The single-tower production system for fuming sulfuric acid according to claim 1, characterized in that: It also includes a secondary fuming sulfuric acid tower (2), and the tail gas outlet at the top of the primary fuming sulfuric acid cooler (3) is connected to the side inlet of the secondary fuming sulfuric acid tower (2).

3. The single-tower production system for fuming sulfuric acid according to claim 2, characterized in that: The bottom outlet of the secondary fuming sulfuric acid tower (2) is connected to the secondary fuming sulfuric acid circulation tank (6), the outlet of the secondary fuming sulfuric acid circulation tank (6) is connected to the inlet of the secondary fuming sulfuric acid cooler (8), and the outlet of the secondary fuming sulfuric acid cooler (8) is connected to the top sulfuric acid inlet of the secondary fuming sulfuric acid tower (2).

4. A single-tower production system for fuming sulfuric acid according to claim 2 or 3, characterized in that: A branch pipe is provided on the connecting pipeline between the primary fuming sulfuric acid tower (1) and the primary fuming sulfuric acid cooler (3), and the branch pipe is the primary acid discharge pipeline (9). A branch pipe is provided on the connecting pipeline between the secondary fuming sulfuric acid tower (2) and the secondary fuming sulfuric acid cooler (8), and the branch pipe is the secondary acid discharge pipeline (10).

5. A single-tower production system for fuming sulfuric acid according to claim 2 or 3, characterized in that: The connecting pipeline between the primary fuming sulfuric acid tower (1) and the primary fuming sulfuric acid cooler (3) is provided with a branch pipeline connected to the secondary fuming sulfuric acid circulation tank (6); The connecting pipe between the secondary fuming sulfuric acid tower (2) and the secondary fuming sulfuric acid cooler (8) is provided with a branch pipe connected to the primary fuming sulfuric acid circulation tank (4).

6. The single-tower production system for fuming sulfuric acid according to claim 1, characterized in that: The packing layer inside the primary fuming sulfuric acid tower (1) is made of ceramic packing.

7. The single-tower production system for fuming sulfuric acid according to claim 2, characterized in that: The height of the packing layer in the secondary fuming sulfuric acid tower (2) is reduced to 60% of the original packing layer height and an acid mist collection mechanism (11) is added to return the acid mist to the primary fuming sulfuric acid circulation tank (4).

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