Scope of application:

This technology is suitable for flue gas desulfurization, ultra-low emissions and resource recycling in various smelting, chemical, thermal power and other industries.        

Main technical content:

(1) Basic principles

As a new wet recovery technology, this technology adopts absorption liquid with binary organic amine as main component. The absorbent is improved on the basis of the original organic amine absorbent, the selectivity, oxidation resistance and foaming inhibition ability of the absorbent are greatly improved, and the desorption energy consumption is greatly reduced. The process absorbs sulfur dioxide in flue gas efficiently through the circulation and regeneration of absorption liquid; sulfur dioxide gas is desorbed from absorption liquid by heating rich liquid (absorption liquid absorbing sulfur dioxide) with low pressure waste heat steam. The lean solution after desorption is returned to the system for recycling and reabsorption, so that the absorption solution is reused, the desulfurization efficiency can be as high as 99.5% or more, and the desulfurization tail gas can be discharged up to standard. The by-product of this process is high-purity sulfur dioxide gas, which can be directly sent to the sulfuric acid system to prepare sulfuric acid, or can also be used to prepare liquid sulfur dioxide or other sulfur chemical products.

(2) Technical advantages

(1) Investment advantages: The investment cost for the construction of this technology project is more than 20 million yuan.

The investment cost of this technology project depends on the project's flue gas intake volume, flue gas sulfur dioxide concentration, flue gas pretreatment process and terminal sulfur resource recovery product production process. Due to the different flue gas conditions of each project owner and the requirements for sulfur resource products (such as liquid sulfur dioxide, industrial sulfuric acid, and analytically pure sulfuric acid), the total investment of the project fluctuates greatly, so there is no relatively fixed standard for investment in technology application.

(2) Operating expenses

The desulfurization operating cost of this technology mainly comes from water, electricity and steam consumption, and the reagent consumption mainly comes from the loss of desulfurization absorbent. The investment intensity of energy and drug consumption depends on process site conditions such as the project flue gas intake volume and the sulfur dioxide concentration in the flue gas. Due to the different flue gas conditions of each project owner and the floating pricing of water, electricity and steam on the project site, there is no relatively fixed standard for technical application operating costs.

Overall, since the project adopts efficient steam utilization technologies such as multi-flow cycle desulfurization process, heat exchangers, and MVR technology, the heat utilization efficiency has been improved, and the steam consumption is less than 6kg per kilogram of sulfur dioxide. For the non-ferrous smelting industry, surplus waste heat steam within the enterprise can be used to make operating costs more economical. HAPU organic amine absorbent purification technology has been developed to effectively remove various impurities and thermally stable salts in the absorbent, reduce the loss of the absorbent by more than 50%, effectively extend the service life of the absorbent, and the annual loss is only 5-10%, effectively reducing Desulfurization operating costs.

(3) Operation stability: This technology project has mature application, low failure rate, and can achieve stable operation throughout the year.              

Technical indicators and conditions of use:

(1) Technical indicators

The technology has a wide range of application and can play a good role in removing sulfur dioxide in flue gas from smelting, chemical and other industries. The desulfurization efficiency is high, reaching more than 99.9%. The sulfur dioxide concentration of desulfurized tail gas is stably lower than the national standard, and can be less than 50mg/Nm3, achieving ultra-low emissions. Flue gas emissions after desulfurization comply with GB 9078-1996 Industrial Kiln Air Pollutant Emission Standards, GB 25466-2010 Lead and Zinc Industrial Pollutant Emission Standards, GB 25467-2010 Copper, Nickel, and Cobalt Industrial Pollutant Emission Standards, GB 26132-2010 Sulfuric Acid Industrial Pollutant Emission Standards, GB 26451-2011 Rare Earth Industrial Pollutant Emission Standards, GB 30770-2014 Tin, Antimony, Mercury industrial pollutant emission standards, GB 31574-2015 recycled copper, aluminum, lead, zinc industrial pollutant emission standards and other national/industry pollutant emission standards.

The sulfur resource recovery rate of this technology is more than 99%, and the national industrial product quality standards such as desulfurization by-products GB/T 534-2014 industrial sulfuric acid superior products, and GB/T 3637-2011 liquid sulfur dioxide first-class products.

(2) Condition requirements

Treatment of flue gas conditions: low-concentration sulfur-containing flue gas, the sulfur dioxide content is higher than 800mg/Nm3, less than 3.5%.

Desulfurization operation requires low pressure saturated steam of no less than 0.35MPa.

(3) Typical scale

The flue gas volume of desulfurization treatment is 20,000 - 250,000 Nm3/h.                                      

Critical equipment and operation management:

(1) Main equipment

The core equipment of this technology includes flue gas purification equipment, absorption towers, analysis towers, circulating water cooling towers, waste heat utilization equipment including heat exchangers, MVR compressors and other waste heat utilization equipment, sulfur resource acid production equipment, and multi-flow path circulation desulfurization automatic control systems.