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Sulphuric Acid Production Plant
An integrated industrial processing system designed to produce concentrated sulphuric acid through continuous chemical conversion, optimized absorption, and high-efficiency thermal recovery.
Plant Overview & Configuration
A complete sulphuric acid production plant consists of multiple process sections working together to complete raw material preparation, chemical conversion, acid production, and energy recovery. Each section is connected through process pipelines and control equipment to maintain continuous production operation.
The main system incorporates a series of closely coordinated production units: sulphur handling and preparation system, sulphur combustion section, waste heat recovery system, catalytic conversion unit, acid absorption and circulation system, tail gas treatment system, alongside electrical control and utility systems.
Catalytic Conversion Stage
The catalytic conversion section is the core reaction stage of sulphuric acid production. SO₂ generated during sulphur combustion enters the catalytic converter, where it reacts with oxygen under catalyst action to form sulphur trioxide (SO₃). The plant adopts a four-stage catalyst bed arrangement with a "3+1" double conversion structure, implementing heat exchangers between stages to manage gas temperatures perfectly.
Technical Specifications
Raw Material Parameters
Combustion Data
Section-by-Section Production Details
Sulphur Handling and Preparation Section
Solid sulphur is transferred into the melting unit, where steam heating converts it into liquid sulphur. Before entering the combustion furnace, the molten sulphur passes through filtration equipment to remove impurities and solid particles. The purified liquid sulphur is stored in a heated tank and continuously supplied through transfer pumps, which ensures stable sulphur feeding and reduces operational fluctuations. Main equipment includes the sulphur melting tank, liquid sulphur filter, sulphur storage tank, sulphur transfer pump, and steam heating system.
Sulphur Combustion Section
The combustion section converts elemental sulphur into sulphur dioxide (SO₂), which is the intermediate gas required for production. Liquid sulphur is atomized through injection equipment and mixed with dried air inside the combustion furnace. The chemical reaction (Sulphur + Oxygen → Sulphur Dioxide) generates high-temperature SO₂ gas. After combustion, the high-temperature gas enters the heat recovery section, where thermal energy is captured before moving into the conversion unit.
Heat Recovery and Steam Generation System
The plant utilizes the heat released from sulphur combustion and catalytic conversion reactions. The heat recovery section includes a waste heat boiler, steam drum, superheater, and heat pipe economizer. The high-temperature process gas transfers heat through the recovery system to generate steam. The generated steam can be effectively applied to sulphur melting operations, equipment heating, production utilities, or external steam supply, improving overall energy utilization.
Acid Absorption and Circulation System
The absorption section converts SO₃ gas into finished product. After catalytic conversion, SO₃ enters the absorption tower system and reacts with circulating sulphuric acid to form concentrated acid. Core equipment includes a drying tower, first absorption tower, second absorption tower, acid circulation tanks, acid circulation pumps, and acid coolers. The circulation system tightly controls acid concentration, temperature, and flow rate during operation while reducing residual SO₃ content.
Environmental Control & Waste Management
The plant integrates modern emission control designs. Remaining process gas passes through a comprehensive tail gas treatment system after the second absorption stage to comply with discharge standards. Production residue, primarily from sulphur filtration, is managed via collection, recycling, centralized treatment, or resource utilization. Wastewater generated from equipment cleaning and desalination systems is successfully treated through neutralization processes before discharge.
Application Fields
Phosphate Fertilizer Production
Used in fertilizer manufacturing, including phosphoric acid preparation and phosphate processing, providing a continuous acid supply for onsite production facilities.
Chemical Processing Facilities
Used as a critical process chemical in overall manufacturing operations, perfectly integrating into chemical facilities requiring controlled production and storage.
Metal Surface Treatment
Widely applied in industrial metal treatment processes, supporting automated operations such as metal pickling, surface cleaning, and oxide removal.
Battery & Mining Sectors
Functions as electrolyte material in lead-acid battery production and drives mineral processing operations involving heavy acid-based chemical reactions.
Frequently Asked Questions
1. What is the main raw material for a sulphuric acid production plant?
The main raw material is elemental sulphur. The recommended sulphur purity is ≥99.9%, with strictly controlled ash, moisture, and carbon content.
2. What production capacity can this plant achieve?
The reference design provides an annual production capacity of 100,000 tons of sulphuric acid, calculated explicitly as 100% H₂SO₄ output.
3. How is sulphuric acid produced in this plant?
The plant converts sulphur into SO₂ through combustion, then converts SO₂ into SO₃ through catalytic oxidation. The SO₃ gas is then absorbed by circulating acid to produce finished sulphuric acid.
4. Does the production plant include energy recovery?
Yes. Waste heat from combustion and conversion processes is efficiently recovered through boilers and heat exchangers to generate approximately 3.82MPa steam.
5. What equipment is included in a complete sulphuric acid production plant?
A complete system includes sulphur preparation equipment, sulphur furnace, catalytic converter, absorption towers, acid circulation system, waste heat recovery units, electrical control system, and supporting utilities.
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