Environmental benefits: the sulfur recovery rate reaches 99.5%, significantly reducing SO2 emissions and meeting strict environmental requirements.
Economic performance: the process of low energy consumption and high recovery rate has improved economic benefits and reduced operating costs.
Social results: this project enhanced the environmental image of a chemical company in Luoyang.
A chemical company in Luoyang originally had a sulfur recovery unit with an annual output of 15000 tons. Due to changes in the total sulfur content in the raw materials, the device is currently operating at low load. This operating state leads to a significant increase in energy consumption and poor economic efficiency. Therefore, the company has decided to carry out technological transformation of the sulfur recovery unit to address environmental risks, improve emission standards, and shoulder environmental responsibilities.
As the technology supplier for this project, Ruichang Environment is customer-oriented and committed to providing advanced process technology solutions to customers. This project is the application of Ruichang Environment’s 8th independent process package in the sulfur recovery unit, marking a further improvement in Ruichang Environment’s EPC (Engineering, Procurement, and Construction) capabilities in the sulfur recovery unit. This is not only an important milestone in the EPC development process of Ruichang Company, but also a powerful support for the company to expand its market share and industry influence.
Process Introduction
This technological transformation project adopts a process route of “two-stage Claus+selective hydrogenation+selective oxidation”, with a maximum total sulfur recovery rate of 99.5%. This process not only produces more sulfur, but also significantly reduces the concentration of SO2 entering the desulfurization unit. The following is a specific process introduction:
Two stage Claus process
- The Claus sulfur recovery process is currently the most mature and widely used sulfur recovery process. This process generates elemental sulfur by reacting hydrogen sulfide (H2S) with sulfur dioxide (SO2) under the action of a catalyst. The reaction process is as follows: 2H2S+SO2 → 3S+2H2O2H2S+SO2 \ rightarrow 3S+2H2O2H2S+SO2 → 3S+2H2O
- The two-stage Claus process achieves a high sulfur recovery rate through two-stage reaction and condensation, maximizing the conversion of H2S into elemental sulfur.
Choose hydrogenation process
Choose hydrogenation process for further removal of sulfides and organic sulfur compounds to ensure that the final emissions meet environmental requirements. In the selection of hydrogenation process, H2S reacts with hydrogen gas (H2) under the action of catalyst to generate sulfur and water.
Choose oxidation process
Choose oxidation process to treat residual sulfides, convert them into elemental sulfur and water through oxidation reaction, and further improve sulfur recovery rate.
Sodium desulfurization unit
The desulfurizer uses a 30% wt sodium hydroxide solution. The design of this desulfurization unit takes into account the flue gas volume of the 5000 ton/year sulfur unit and the existing 15000 ton/year sulfur unit for technological renovation and construction. It can adapt to the SO2 concentration fluctuations of the two units under various working conditions and achieve continuous and stable standard emissions.
Project characteristics
The sulfur recovery technology renovation project has the following characteristics:
- Stable process and simple operation: This process continues the advantages of the Claus type process, with simple and stable operation, and is suitable for long-term continuous operation.
- Low investment: The additional investment of this process is relatively low, close to the conventional Claus process, and has high economic efficiency.
- Strong adaptability: This process can process acidic gases containing ammonia and methanol, and can effectively treat gases with H2S concentrations as low as 20%, with strong adaptability.
- High sulfur recovery rate: By selecting hydrogenation and oxidation processes, the sulfur recovery rate was increased from the conventional 96-97% to 99%, significantly improving the sulfur recovery efficiency.
- Low energy consumption and no secondary pollution: Low unit energy consumption, no secondary pollution, significant environmental benefits, small footprint, suitable for small and medium-sized sulfur recovery units.
- By-product steam: This process produces steam as a byproduct, which can be self produced and used, improving energy utilization efficiency.
- Enhance operability: Adjusted the ratio of air and acidic gas, with H2S/SO2>2, enhancing the operability of the process.
What we do?
Ruichang Environment rose to the challenge in this project, adhering to the principle of “customer-oriented” and shouldering the mission of “Ruichang Blue, China Blue”, providing advanced process technology solutions for the owners. The following are the main steps of project implementation:
- Requirement analysis: In response to the current situation of the sulfur recovery unit of a chemical company in Luoyang, Ruichang Environment conducted a detailed demand analysis and determined the specific goals and requirements for the technological transformation.
- Process planning: Ruichang Environment has designed a process route of “two-stage Claus+selective hydrogenation+selective oxidation” based on the results of demand analysis, ensuring the feasibility and effectiveness of the process.
- Equipment supply: Ruichang Environment is responsible for equipment manufacture, ensuring equipment quality and process compatibility.
- Installation and debugging: Ruichang Environment is responsible for the installation and debugging of equipment, ensuring the normal operation of the equipment and the stability of the process.
- Operation and maintenance: Ruichang Environment provides operation and maintenance services to ensure the long-term stable operation of equipment and meet the environmental protection requirements of the owner.
Ruichang Environment has risen to the challenge in this sulfur recovery technology renovation project, providing advanced process technology solutions and achieving significant environmental, economic, and social benefits. The successful implementation of this project is not only a further improvement of Ruichang Environment’s EPC capabilities in sulfur recovery units, but also an important milestone in the company’s EPC development process, providing strong support for the company to continue expanding its market share and industry influence. Ruichang Environment will continue to adhere to the concept of “customer-oriented”, constantly innovate, and provide customers with better quality services and solutions.
