Wet-process acid making system capable of operating for long period
By introducing a combustion air unit and an aluminum silicate insulation layer, the problem of stable operation of the wet acid production system was solved, enabling long-term operation and environmentally compliant emissions, and avoiding local condensation leakage.
Patent Information
- Application Number
- CN202422945232.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-02
AI Technical Summary
Existing wet acid production systems are difficult to operate stably for a long period of time, resulting in unstable emissions that do not meet environmental standards and the existence of localized condensation corrosion and leakage problems.
The system incorporates a combustion air unit and a multi-layer aluminum silicate insulation layer to ensure that the filtered air aids combustion. Combined with the circulating water cooling of the sulfuric acid cooling unit, a stable sulfuric acid generation and cooling process is formed, avoiding localized condensation corrosion.
This has enabled the wet acid production system to operate for extended periods, ensuring compliance with environmental emission standards, preventing localized condensation leaks, and improving the system's stability and environmental performance.
Smart Images
Figure CN223620151U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a wet acid production system that can operate for a long period of time, and belongs to the field of wet acid production technology. Background Technology
[0002] The WSA (Warm Contact) process for sulfuric acid production is primarily designed based on Haldor Topsoe technology. Its purpose is to convert hydrogen sulfide acid gas from the upstream process into 98% concentrated liquid sulfuric acid, while simultaneously integrating the byproduct medium-pressure steam into the pipeline network to ensure compliance with environmental regulations. Since the stable operation of the WSA unit is crucial for achieving environmental emission standards, ensuring the stable operation of the sulfuric acid recovery unit is a critical issue. Utility Model Content
[0003] To address the technical problems existing in the prior art, this utility model provides a wet acid production system that can operate for a long period of time.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is a wet sulfuric acid production system capable of long-term operation, comprising: a hydrogen sulfide combustion unit, a sulfur dioxide converter, a sulfuric acid condenser, a combustion air unit, and a sulfuric acid cooling unit. The hydrogen sulfide combustion unit is connected to the sulfur dioxide converter via a waste heat recovery boiler. The waste heat recovery boiler is connected to a steam drum. A process gas cooler is installed at the bottom of the waste heat recovery boiler and is connected to the steam drum. The waste heat recovery boiler is connected to the sulfuric acid condenser. The outlet of the sulfuric acid condenser is connected to a desulfurization system. The condensate outlet of the sulfuric acid condenser is connected to the sulfuric acid cooling unit. The heat exchange inlet of the sulfuric acid condenser is connected to the combustion air unit. The heat exchange outlet of the sulfuric acid condenser is connected to the hydrogen sulfide combustion unit via a first fan.
[0005] The combustion air unit includes a second fan and a first filter. The first filter is connected to the second fan via a first control valve, and the second fan is connected to the sulfuric acid condenser via a combustion air heat exchanger.
[0006] Preferably, the second fan is also connected to a second filter, and the second filter is connected to a second control valve.
[0007] Preferably, the sulfuric acid cooling unit includes a sulfuric acid storage tank, a liquid pump, and a sulfuric acid heat exchanger. The sulfuric acid storage tank is connected to the sulfuric acid heat exchanger via the liquid pump, the sulfuric acid heat exchanger is connected to an external sulfuric acid pipeline, and the sulfuric acid heat exchanger is connected to circulating water via a pipeline pump.
[0008] Preferably, the process gas cooler is provided with a multi-layer aluminum silicate insulation layer on its exterior.
[0009] Compared with the prior art, the present invention has the following technical effects: The present invention adopts the addition of a combustion air unit in the system. After the combustion air unit filters the air, it enters the sulfuric acid condenser for heat exchange, and then enters the hydrogen sulfide combustion unit for combustion support, ensuring the stability of the system combustion. At the same time, since the condensation point of the process gas is 249℃, the process gas cooler is equipped with a multi-layer aluminum silicate insulation layer, which can effectively avoid the problem of local pitting corrosion leakage caused by repeated local condensation, thus preventing the process gas from leaking and polluting the environment. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation
[0011] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0012] like Figure 1 As shown, a wet sulfuric acid production system capable of long-term operation includes: a hydrogen sulfide combustion unit 1, a sulfur dioxide converter 2, a sulfuric acid condenser 3, a combustion air unit 4, and a sulfuric acid cooling unit 5. The hydrogen sulfide combustion unit 1 is connected to the sulfur dioxide converter 2 via a waste heat recovery boiler 6, which is connected to a steam drum 7. A process gas cooler 8 is installed at the bottom of the waste heat recovery boiler 6 and is connected to the steam drum 7. The waste heat recovery boiler 6 is also connected to the sulfuric acid condenser 3. The outlet of the sulfuric acid condenser 3 is connected to a desulfurization system, and the condensate outlet of the sulfuric acid condenser 3 is connected to the sulfuric acid cooling unit 5. The heat exchange inlet of the sulfuric acid condenser 3 is connected to the combustion air unit 4, and the heat exchange outlet of the sulfuric acid condenser 3 is connected to the hydrogen sulfide combustion unit 4 via a first fan 9. The combustion air unit 4 includes a second fan 10 and a first filter 11. The first filter 10 is connected to the second fan 10 via a first control valve 12, and the second fan 10 is connected to the sulfuric acid condenser 3 via a combustion air heat exchanger 13. The second fan 10 is also connected to a second filter 14, and the second filter 14 is connected to a second control valve 15. The second filter 14 serves as a backup filter.
[0013] In this invention, the raw material gas enters the hydrogen sulfide combustion unit 1 for combustion. The hot air after combustion is heated by the waste heat recovery boiler 6 and then enters the sulfur dioxide converter 2. After combustion in the sulfur dioxide converter 2, the waste acid and sulfuric acid-containing gas in the process gas are oxidized into SO2 gas. The SO2 gas is heated by the process gas cooler 8 and then enters the sulfuric acid condenser 3. Heat exchange occurs in the sulfuric acid condenser 3, and the condensed sulfuric acid enters the sulfuric acid cooling unit 5. The process gas cooler 8 is externally equipped with a multi-layer aluminum silicate insulation layer 20. This effectively avoids the problem of localized pitting corrosion and leakage caused by repeated localized condensation, which could lead to environmental pollution from process gas leakage. The combustion air unit 4 provides sufficient combustion air to the hydrogen sulfide combustion unit 1. The use of two systems for gas supply ensures the stability of the system combustion.
[0014] The sulfuric acid cooling unit 5 includes a sulfuric acid storage tank 16, a liquid pump 17, and a sulfuric acid heat exchanger 18. The sulfuric acid storage tank 16 is connected to the sulfuric acid heat exchanger 18 via the liquid pump 17. The sulfuric acid heat exchanger 18 is connected to the external sulfuric acid pipeline and is connected to circulating water via a pipeline pump 19. The sulfuric acid cooling unit 5 cools and lowers the temperature of the sulfuric acid using circulating water until the process stabilizes before it enters the external sulfuric acid pipeline.
[0015] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model shall be included within the scope of the present utility model.
Claims
1. A wet acid production system capable of long-term operation, comprising: A hydrogen sulfide combustion unit, a sulfur dioxide converter, a sulfuric acid condenser, a combustion air unit, and a sulfuric acid cooling unit are characterized in that: the hydrogen sulfide combustion unit is connected to the sulfur dioxide converter via a waste heat recovery boiler; the waste heat recovery boiler is connected to a steam drum; a process gas cooler is installed at the bottom of the waste heat recovery boiler and is connected to the steam drum; the waste heat recovery boiler is connected to the sulfuric acid condenser; the outlet of the sulfuric acid condenser is connected to a desulfurization system; the condensate outlet of the sulfuric acid condenser is connected to the sulfuric acid cooling unit; the heat exchange inlet of the sulfuric acid condenser is connected to the combustion air unit; and the heat exchange outlet of the sulfuric acid condenser is connected to the hydrogen sulfide combustion unit via a first fan. The combustion air unit includes a second fan and a first filter. The first filter is connected to the second fan via a first control valve, and the second fan is connected to the sulfuric acid condenser via a combustion air heat exchanger.
2. The wet acid production system capable of long-term operation according to claim 1, characterized in that: The second fan is also connected to a second filter, and the second filter is connected to a second control valve.
3. The wet acid production system capable of long-term operation according to claim 1, characterized in that: The sulfuric acid cooling unit includes a sulfuric acid storage tank, a liquid pump, and a sulfuric acid heat exchanger. The sulfuric acid storage tank is connected to the sulfuric acid heat exchanger via the liquid pump. The sulfuric acid heat exchanger is connected to an external sulfuric acid pipeline. The sulfuric acid heat exchanger is connected to circulating water via a pipeline pump.
4. The wet acid production system capable of long-term operation according to claim 1, characterized in that: The process gas cooler is externally provided with multiple layers of aluminum silicate insulation.