Sulfuric Acid Project
Sulfuric Acid Project – 200,000 TPA Sulfur-Based Acid Plant
Client: Shouguang Lianmeng Phosphate & Compound Fertilizer Co., Ltd.
Project Type: Sulfur Burning Sulfuric Acid Plant
Capacity: 200,000 Tons per Year (Industrial Sulfuric Acid)
Project Overview
For the sulfur-based sulfuric acid project of Shouguang Lianmeng Phosphate & Compound Fertilizer Co., Ltd., our company was responsible for the complete engineering scope, including system design, equipment supply, installation, and commissioning.The plant is designed for an annual production capacity of 200,000 tons of industrial sulfuric acid, ensuring high conversion efficiency, stable operation, and energy recovery.
The overall system consists of:
Air drying system
Sulfur melting and burning furnace
Converter (oxidation tower)
Absorption tower
Waste heat boiler / Steam generation system
Auxiliary heat recovery and process control systems
Brief Process Description
1. Sulfur Melting and Combustion
Solid sulfur is first heated in a melting tank to produce liquid sulfur. The molten sulfur is then pumped and atomized into the sulfur-burning furnace, where it reacts with oxygen in dry air to form sulfur dioxide (SO₂).
Main reaction:
S + O₂ → SO₂
This reaction is highly exothermic, and the furnace temperature typically exceeds 1000°C. The released heat is recovered through a waste heat boiler to generate steam for plant use, improving overall energy efficiency.
2. Catalytic Oxidation of Sulfur Dioxide (Conversion Stage)
The high-temperature SO₂ gas from the furnace is cooled through a waste heat recovery system and then enters the converter (oxidation tower).
In the presence of a catalyst (typically vanadium-based), sulfur dioxide reacts with oxygen to form sulfur trioxide (SO₃).
Main reaction:
SO₂ + 1/2 O₂ → SO₃
This is a reversible exothermic reaction. Multi-stage catalytic beds with intermediate cooling are used to achieve high conversion efficiency and optimize equilibrium conditions.
3. Sulfur Trioxide Absorption
The produced SO₃ gas enters the absorption tower, where it is absorbed by concentrated sulfuric acid (typically 98.3%).
Main reaction:
SO₃ + H₂O → H₂SO₄
Under controlled conditions, oleum (fuming sulfuric acid) can also be produced if required.
Efficient absorption design ensures:
High acid concentration stability
Low SO₂ emission
Compliance with environmental standards
Project Highlights
✔ Annual output of 200,000 tons of industrial sulfuric acid
✔ Efficient heat recovery and steam generation
✔ High SO₂ conversion rate
✔ Stable continuous operation
✔ Environmentally compliant emission control
After commissioning, the system has been operating smoothly, meeting all design parameters and delivering reliable, energy-efficient sulfuric acid production.