Purification treatment system for sulfur melting flue gas in process of preparing acid from sulfur

Abstract

The utility model relates to the technical field of waste gas purification treatment, in particular to a sulfur melting flue gas purification treatment system in sulfur acid making, which comprises a flue gas system, and is characterized in that the flue gas system comprises a waste gas collection pipeline, one end of the waste gas collection pipeline is connected with a reverse spraying pipe, and the other end of the waste gas collection pipeline is connected with a reverse spraying dust removal tower; the system comprises a reverse spraying dust removal tower, one end of the reverse spraying dust removal tower is connected with a secondary dust removal tower, one end of the secondary dust removal tower is connected with a heat exchanger, and one end of the heat exchanger is connected with a dry-process fine desulfurization device. Through multi-stage treatment (including the reverse spraying dust removal tower, the secondary dust removal tower and the dry-process fine desulfurization device), the system can efficiently remove particulate matters and sulfides in flue gas; it is ensured that discharged flue gas meets the environmental protection standard, and pollution to the environment is reduced; all the components (such as the waste gas collecting pipeline, the reverse spraying pipe, the dust removal tower, the heat exchanger and the desulfurization device) are tightly matched to form a complete flue gas purification process, so that the operation efficiency and the stability of the system are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas purification and treatment, and in particular to a purification and treatment system for molten sulfur flue gas in sulfuric acid production. Background Technology

[0002] In the sulfuric acid production process, the sulfur melting step generates a large amount of flue gas containing particulate matter and sulfides. Direct emission of this flue gas would cause serious environmental pollution, and the sulfides in the flue gas would also corrode equipment, affecting production efficiency. Therefore, efficient purification of the sulfur melting flue gas is essential. Traditional flue gas treatment technologies typically employ single dust removal or desulfurization devices, which have the following problems: Low purification efficiency: Single devices cannot simultaneously remove particulate matter and sulfides, failing to meet increasingly stringent environmental protection requirements; High energy consumption: Inadequate system design leads to high operating resistance and energy consumption; Equipment corrosion: Sulfides in the flue gas easily condense at low temperatures, causing corrosion of pipes and equipment, affecting system lifespan; Resource waste: The heat and sulfides in the flue gas are not effectively recovered and utilized, resulting in resource waste.

[0003] Chinese patent discloses a flue gas treatment system (CN 222256665 U) including a boiler, which is connected in series with a dust removal device, a thickening tower, an absorption tower, and an exhaust chimney. A liquid storage tank is located at the bottom of the absorption tower, and the tank is connected to both the thickening tower and an ammonia tank. However, this flue gas treatment system has low purification efficiency: a single device cannot simultaneously remove particulate matter and sulfides, failing to meet increasingly stringent environmental protection requirements; high energy consumption: unreasonable system design leads to high operating resistance and energy consumption; easy equipment corrosion: sulfides in the flue gas easily condense at low temperatures, causing corrosion of pipes and equipment, affecting system lifespan; resource waste: the heat and sulfides in the flue gas are not effectively recovered and utilized, resulting in resource waste. Therefore, a purification system for molten sulfur flue gas in sulfuric acid production is needed. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing flue gas treatment systems, such as low purification efficiency, high energy consumption, easy equipment corrosion, and resource waste. A single device is insufficient to simultaneously remove particulate matter and sulfides, failing to meet environmental protection requirements. Unreasonable system design leads to high operating resistance and energy consumption. Sulfides in flue gas are prone to condensation and corrosion of pipes and equipment. At the same time, the heat and sulfides in the flue gas are not effectively recovered and utilized, resulting in resource waste. Therefore, this invention proposes a purification and treatment system for molten sulfur flue gas in sulfuric acid production.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a purification system for molten sulfur flue gas in sulfuric acid production, comprising a flue gas system, characterized in that: the flue gas system includes a waste gas collection pipe, one end of which is connected to a reverse-jet nozzle, the other end of which is connected to a reverse-jet dust collector tower, one end of which is connected to a secondary dust collector tower, one end of which is connected to a heat exchanger, one end of which is connected to a dry fine desulfurization device, one end of which is connected to an induced draft fan, one end of which is connected to an exhaust stack, and a steam inlet pipe on one side of the heat exchanger and a steam outlet pipe on the other side. Multi-stage treatment: Through multi-stage treatment by the reverse-jet dust collector tower, the secondary dust collector tower, and the dry fine desulfurization device, particulate matter and sulfides in the flue gas are ensured to be efficiently removed, meeting environmental emission standards. The components work closely together to form a complete flue gas purification process, improving the system's operating efficiency and stability; significantly reducing pollutant emissions in the flue gas, reducing environmental pollution, and meeting green production requirements.

[0006] Preferably, the exhaust gas collection pipe is DN700mm long, approximately 130m, with a resistance of approximately 3.1 kPa. The exhaust gas collection pipe is a large-diameter heating sleeve, heating the flue gas to a temperature of 145-150℃. The large-diameter design ensures high flue gas collection efficiency and reduces flue gas leakage; the heating sleeve design maintains the flue gas temperature at 145-150℃, preventing condensation of sulfides in the flue gas and avoiding pipe blockage and equipment corrosion; the reasonable pipe design controls the resistance to 3.1 kPa, reducing system energy consumption.

[0007] Preferably, one end of the exhaust gas collection pipe is connected to a filter gas collection hood, and the other end is equipped with a sulfur melting tank gas collection hood. The top of the sulfur melting tank gas collection hood is equipped with a liquid sulfur storage tank gas collection pipe, and the top of the liquid sulfur storage tank gas collection pipe is equipped with a square groove gas collection pipe. The filter gas collection hood, the sulfur melting tank gas collection hood, the liquid sulfur storage tank gas collection pipe, and the square groove gas collection pipe are all interconnected and coordinated. Through the coordination of multiple gas collection hoods and pipes, it is ensured that the flue gas generated during the sulfur melting process is comprehensively collected without any omissions; the interconnected gas collection hoods and pipes form a highly efficient flue gas collection network, improving the overall operating efficiency of the system; preventing flue gas escape, and reducing pollution to the working environment and the surrounding environment.

[0008] Preferably, an alkaline dosing device is connected to one side of the reverse-jet dust collector, and a top outlet is provided at the top of the reverse-jet dust collector. A variable-diameter duct is provided on one side of the top of the secondary dust collector, and a secondary dust outlet is provided on the other side. The variable-diameter duct is matched with the top outlet. The alkaline dosing device, in conjunction with the reverse-jet dust collector, enhances the dust removal effect and neutralizes acidic substances in the flue gas. The matching design of the variable-diameter duct and the top outlet optimizes the flue gas flow path and improves dust removal efficiency. Furthermore, the matching design of the variable-diameter duct and the top outlet reduces the equipment footprint and lowers system complexity.

[0009] Preferably, a backspray pipe is provided on one side of the backspray dust collector, one end of which cooperates with the backspray dust collector. A conveying pipe is provided on one side of the secondary dust collector, cooperating with both the backspray dust collector and the secondary dust collector. A liquid filling pipe is connected to one end of the backspray dust collector, and the other end of the liquid filling pipe is connected to a liquid sulfur storage tank. The cooperative design of the backspray pipe and the backspray dust collector enhances the backspray effect of the flue gas and improves dust removal efficiency. The conveying pipe realizes the material transportation between the backspray dust collector and the secondary dust collector, ensuring continuous system operation. The liquid filling pipe transports the liquid from the liquid sulfur storage tank to the backspray dust collector, achieving efficient resource utilization and reducing waste.

[0010] Preferably, the resistance of the secondary dust removal tower is approximately 2.5 kPa, the resistance of the heat exchanger is approximately 1.0 kPa, the resistance of the dry desulfurization unit is approximately 1.0 kPa, and the total resistance of the flue gas system is approximately 7.6 kPa. The margin coefficient is 1.1-1.3, and is taken as 1.2. The flue gas system resistance is rounded to 9.2 kPa. The reasonable design of the resistance of each component ensures stable system operation and reduces energy consumption. The margin coefficient of 1.2 provides sufficient operating margin for the system, avoiding system failures due to resistance fluctuations. Through precise resistance calculation and margin design, the operating efficiency and reliability of the system are improved.

[0011] The advantages of this utility model are:

[0012] This application utilizes a multi-stage treatment system (including a reverse-jet dust collector, a secondary dust collector, and a dry desulfurization unit) to efficiently remove particulate matter and sulfides from flue gas, ensuring that emissions meet environmental standards and reducing pollution. The components (such as waste gas collection pipes, reverse-jet pipes, dust collectors, heat exchangers, and desulfurization units) work closely together to form a complete flue gas purification process, improving system efficiency and stability. The use of heat exchangers enables heat recovery from the flue gas, reducing energy consumption. The liquid sulfur supply pipe transports liquid from the liquid sulfur storage tank to the reverse-jet dust collector, achieving resource recycling and reducing waste. The waste gas collection pipe employs a heated sleeve design to maintain the flue gas temperature at 145-150℃, preventing sulfide condensation and avoiding pipe blockage and equipment corrosion. The system's component resistance is rationally designed, with total resistance controlled at 9.2 kPa (including margin), reducing system energy consumption and improving operating efficiency. It significantly reduces pollutant emissions from flue gas, meeting green production requirements and reducing the risk of environmental penalties. The system operates stably, has low maintenance costs, and offers high economic benefits. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Please see Figure 1 As shown:

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

[0016] In the diagram: 1. Square trough gas collection pipe; 2. Liquid sulfur storage tank gas collection pipe; 3. Molten sulfur tank gas collection hood; 4. Filter gas collection hood; 5. Waste gas collection pipe; 6. Top outlet; 7. Backspray nozzle; 8. Backspray dust removal tower; 9. Alkali dosing device; 10. Conveying pipe; 11. Variable diameter duct; 12. Secondary dust outlet; 13. Secondary dust removal tower; 15. Heat exchanger; 16. Dry fine desulfurization device; 17. Exhaust fan; 18. Exhaust stack; 19. Liquid sulfur storage tank; 20. Liquid filling pipe; 21. Steam inlet pipe; 22. Steam outlet pipe. Detailed Implementation

[0017] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0018] Example

[0019] Please see Figure 1 As shown:

[0020] Example: A purification system for molten sulfur flue gas in sulfuric acid production, comprising a flue gas system, characterized in that: the flue gas system includes a waste gas collection pipe 5, one end of which is connected to a reverse-jet nozzle 7, and the other end of which is connected to a reverse-jet dust collector 8. One end of the reverse-jet dust collector 8 is connected to a secondary dust collector 13, one end of which is connected to a heat exchanger 15. One end of the heat exchanger 15 is connected to a dry fine desulfurization device 16, one end of which is connected to an induced draft fan 17, and one end of the induced draft fan 17 is connected to an exhaust stack 18. The heat exchanger 15 has a steam inlet pipe 21 on one side and a steam outlet pipe 22 on the other side. Multi-stage treatment: Through multi-stage treatment by the reverse-jet dust collector 8, the secondary dust collector 13, and the dry fine desulfurization device 16, particulate matter and sulfides in the flue gas are efficiently removed, meeting environmental emission standards. The components work closely together to form a complete flue gas purification process, which improves the system's operating efficiency and stability; it significantly reduces pollutant emissions in flue gas, reduces environmental pollution, and meets the requirements of green production.

[0021] In this embodiment, the exhaust gas collection pipe 5 is approximately 130m long and DN700mm in diameter, with a resistance of approximately 3.1 kPa. The exhaust gas collection pipe 5 is a large-diameter heating sleeve, heating the flue gas to a temperature of 145-150℃. The large-diameter design ensures high flue gas collection efficiency and reduces flue gas leakage; the heating sleeve design maintains the flue gas temperature at 145-150℃, preventing condensation of sulfides in the flue gas and avoiding pipe blockage and equipment corrosion; the reasonable pipe design controls the resistance at 3.1 kPa, reducing system energy consumption.

[0022] In this embodiment, one end of the exhaust gas collection pipe 5 is connected to a filter gas collection hood 4, and the other end is equipped with a sulfur melting tank gas collection hood 3. The top of the sulfur melting tank gas collection hood 3 is equipped with a liquid sulfur storage tank gas collection pipe 2, and the top of the liquid sulfur storage tank gas collection pipe 2 is equipped with a square groove gas collection pipe 1. The filter gas collection hood 4, the sulfur melting tank gas collection hood 3, the liquid sulfur storage tank gas collection pipe 2, and the square groove gas collection pipe 1 are all interconnected and cooperate with each other. Through the cooperation of multiple gas collection hoods and pipes, it is ensured that the flue gas generated during the sulfur melting process is comprehensively collected without any omissions; the interconnected gas collection hoods and pipes form an efficient flue gas collection network, improving the overall operating efficiency of the system; preventing flue gas escape, and reducing pollution to the working environment and the surrounding environment.

[0023] In this embodiment, an alkaline dosing device 9 is connected to one side of the reverse-jet dust collector 8, and a top outlet 6 is provided at the top of the reverse-jet dust collector 8. A variable-diameter duct 11 is provided on one side of the top of the secondary dust collector 13, and a secondary dust outlet 12 is provided on the other side. The variable-diameter duct 11 cooperates with the top outlet 6. The alkaline dosing device 9, in conjunction with the reverse-jet dust collector 8, enhances the dust removal effect and neutralizes acidic substances in the flue gas. The design of the variable-diameter duct 11 and the top outlet 6 optimizes the flue gas flow path and improves dust removal efficiency. Furthermore, the design of the variable-diameter duct 11 and the top outlet 6 reduces the equipment footprint and lowers system complexity.

[0024] In this embodiment, a backspray pipe 7 is provided on one side of the backspray dust collector 8, and one end of the backspray pipe 7 cooperates with the backspray dust collector 8. A conveying pipe 10 is provided on one side of the secondary dust collector 13, and the conveying pipe 10 cooperates with both the backspray dust collector 8 and the secondary dust collector 13. One end of the backspray dust collector 8 is connected to a liquid filling pipe 20, and the other end of the liquid filling pipe 20 is connected to a liquid sulfur storage tank 19. The cooperative design of the backspray pipe 7 and the backspray dust collector 8 enhances the backspray effect of the flue gas and improves the dust removal efficiency. The conveying pipe 10 realizes the material transportation between the backspray dust collector 8 and the secondary dust collector 13, ensuring continuous operation of the system. The liquid filling pipe 20 transports the liquid in the liquid sulfur storage tank 19 to the backspray dust collector 8, realizing efficient use of resources and reducing waste.

[0025] In this embodiment, the resistance of the secondary dust removal tower 13 is approximately 2.5 kPa, the resistance of the heat exchanger 15 is approximately 1.0 kPa, the resistance of the dry desulfurization device is approximately 1.0 kPa, and the total resistance of the flue gas system is approximately 7.6 kPa. The margin coefficient is 1.1-1.3, and is taken as 1.2. The flue gas system resistance is rounded to 9.2 kPa. The resistance of each component is reasonably designed to ensure stable system operation and reduce energy consumption. The margin coefficient of 1.2 provides sufficient operating margin for the system and avoids system failure due to resistance fluctuations. Through precise resistance calculation and margin design, the operating efficiency and reliability of the system are improved.

[0026] The working principle of this embodiment:

[0027] Flue gas collection: During the sulfur-to-acid production process, the sulfur melting process generates a large amount of high-temperature flue gas containing particulate matter and sulfides. This flue gas is first collected centrally through the waste gas collection pipe 5. The waste gas collection pipe 5 adopts a large-diameter heating sleeve design. When the flue gas temperature is below 145℃, the heating sleeve will automatically heat up to maintain the flue gas temperature at 145-150℃, preventing sulfides from condensing and clogging the pipe or corroding the equipment. One end of the top of the waste gas collection pipe 5 is connected to the filter gas collection hood 4, and the other end is connected to the sulfur melting tank gas collection hood 3, ensuring that the flue gas is collected completely without any omissions. The top of the sulfur melting tank gas collection hood 3 is also connected to the liquid sulfur storage tank gas collection pipe 2 and the square trough gas collection pipe 1, forming a highly efficient flue gas collection network.

[0028] Preliminary dust removal (reverse spray dust removal): The collected flue gas enters the reverse spray pipe 7 through the exhaust gas collection pipe 5. In the reverse spray pipe 7, the flue gas comes into full contact with the sprayed liquid (such as alkaline solution), and particulate matter and some sulfides in the flue gas are initially removed. The reverse spray pipe 7 is connected to the reverse spray dust removal tower 8, and the flue gas then enters the reverse spray dust removal tower 8 for further treatment. An alkaline solution dosing device 9 is connected to one side of the reverse spray dust removal tower 8 to continuously add alkaline solution into the tower, enhance the dust removal effect and neutralize acidic substances in the flue gas.

[0029] Secondary dust removal: The flue gas after the reverse jet dust removal process is discharged from the top outlet 6 of the reverse jet dust removal tower 8 and enters the secondary dust removal tower 13 through the variable diameter duct 11. In the secondary dust removal tower 13, the flue gas undergoes further removal of residual particulate matter through an optimized flow path. The secondary dust outlet 12 of the secondary dust removal tower 13 discharges the removed particulate matter, ensuring cleaner flue gas.

[0030] Heat recovery: The flue gas after dust removal enters the heat exchanger 15 from the secondary dust removal tower 13. In the heat exchanger 15, the high-temperature flue gas exchanges heat with the cooling medium, the flue gas temperature decreases, and the recovered heat can be used for heating other processes or systems, reducing overall energy consumption. Steam enters the heat exchanger 15 through the steam inlet pipe 21, and condensate is discharged through the steam outlet pipe 22 to prevent scaling on the plates.

[0031] Deep desulfurization: The cooled flue gas enters the dry desulfurization unit 16. In the dry desulfurization unit, the flue gas undergoes further desulfurization through adsorbents or chemical reactions to remove sulfides, ensuring that the emitted flue gas meets environmental protection standards;

[0032] Flue gas emission: The purified flue gas is conveyed to the exhaust stack 18 by the induced draft fan 17 and finally discharged into the atmosphere. The induced draft fan 17 provides power for the flue gas flow to ensure the normal operation of the system;

[0033] Resource recovery and recycling: In the reverse jet dust removal tower 8, the liquid supply pipe 20 transports the liquid in the liquid sulfur storage tank 19 into the tower for dust removal and neutralization of acidic substances, realizing the recycling of resources. The heat recovered by the heat exchanger 15 can be used in other processes, further reducing the system energy consumption.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A purification and treatment system for sulfur-melted flue gas in sulfuric acid production, comprising a flue gas system, characterized in that: The flue gas system includes a waste gas collection pipe (5), one end of which is connected to a reverse spray pipe (7), and the other end of which is connected to a reverse spray dust removal tower (8). One end of the reverse spray dust removal tower (8) is connected to a secondary dust removal tower (13), and one end of the secondary dust removal tower (13) is connected to a heat exchanger (15). One end of the heat exchanger (15) is connected to a dry fine desulfurization device (16), and one end of the dry fine desulfurization device (16) is connected to an induced draft fan (17). One end of the induced draft fan (17) is connected to an exhaust stack (18). The heat exchanger (15) has a steam inlet pipe (21) on one side and a steam outlet pipe (22) on the other side.

2. The purification and treatment system for molten sulfur flue gas in sulfuric acid production according to claim 1, characterized in that: The exhaust gas collection pipe (5) is DN700mm long and about 130m long, with a resistance of about 3.1KPa. The exhaust gas collection pipe (5) is a large-diameter heating sleeve, which heats the flue gas at a temperature of 145-150℃.

3. The purification and treatment system for molten sulfur flue gas in sulfuric acid production according to claim 2, characterized in that: The exhaust gas collection pipe (5) is connected to a filter gas collection hood (4) at one end and a sulfur melting tank gas collection hood (3) at the other end. The top of the sulfur melting tank gas collection hood (3) is equipped with a liquid sulfur storage tank gas collection pipe (2). The top of the liquid sulfur storage tank gas collection pipe (2) is equipped with a square groove gas collection pipe (1). The filter gas collection hood (4), the sulfur melting tank gas collection hood (3), the liquid sulfur storage tank gas collection pipe (2) and the square groove gas collection pipe (1) are all interconnected and cooperate with each other.

4. The purification and treatment system for molten sulfur flue gas in sulfuric acid production according to claim 1, characterized in that: The reverse-jet dust collector (8) is connected to an alkaline dosing device (9) on one side. The top of the reverse-jet dust collector (8) is provided with a top outlet (6). The top of the secondary dust collector (13) is provided with a variable diameter air duct (11) on one side and a secondary dust outlet (12) on the other side. The variable diameter air duct (11) is matched with the top outlet (6).

5. The purification and treatment system for molten sulfur flue gas in sulfuric acid production according to claim 1, characterized in that: The reverse-spray dust removal tower (8) is provided with a reverse-spray pipe (7) on one side. One end of the reverse-spray pipe (7) is connected to the reverse-spray dust removal tower (8). The secondary dust removal tower (13) is provided with a conveying pipe (10) on one side. The conveying pipe (10) is connected to the reverse-spray dust removal tower (8) and the secondary dust removal tower (13). One end of the reverse-spray dust removal tower (8) is connected to a liquid filling pipe (20), and the other end of the liquid filling pipe (20) is connected to a liquid sulfur storage tank (19).

6. The purification and treatment system for molten sulfur flue gas in sulfuric acid production according to claim 1, characterized in that: The resistance of the secondary dust removal tower (13) is about 2.5 kPa, the resistance of the heat exchanger (15) is about 1.0 kPa, the resistance of the dry desulfurization device is about 1.0 kPa, the total resistance of the flue gas system is about 7.6 kPa, the margin coefficient is 1.1-1.3, and we take 1.

2. The resistance of the flue gas system after rounding is 9.2 kPa.

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