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Steel Slag Desulfurization

Through more than ten years of independent R&D, Taiji pioneered the DS Multiphase Reactor in China. Using steel slag powder to replace lime (limestone powder) as the desulfurization absorbent, the steel slag flue gas desulfurization technology has complete independent intellectual property rights and has led or participated in national and industry standard formulation. Compared with traditional processes, this technology better conforms to national source-control policies, offers significant cost advantages, and delivers dual benefits of industrial solid waste valorization and deep flue gas purification. Desulfurization by-products can be used as soil amendments, cement setting regulators, and raw meal additives, truly realizing a circular economy model of treating waste with waste to enable resource reuse.

Core Technical Features

Typical Cases

I. Core Technical Features:
Gas-liquid co-current internal flow guidance intensifies mass transfer — improves desulfurization efficiency.
Polymer material construction — completely solves corrosion problems.
Nozzle-free structure — completely solves clogging problems.

II. Steel Slag as Desulfurization Absorbent
Steel slag is used as the desulfurization absorbent to replace lime (limestone); bauxite residue, white mud, fly ash, and carbide slag can also be used as absorbents.

III. Comprehensive utilization of desulfurization by-products as soil amendments for saline-alkali land improvement or as cement raw materials.

1. Co-current Internal Flow Guidance Enhances Mass Transfer

The desulfurization equipment consists of several absorption units, each equipped with convergent-divergent concentric rotary built-in components. When flue gas and absorption slurry enter from the top of the tower, the built-in components force the gas and liquid phases to continuously change speed and direction. The velocity difference between flue gas and absorption slurry causes the liquid curtain to be atomized into tiny droplets as the gas passes through it repeatedly. Liquid films, liquid curtains, and droplets fill the entire equipment space, and gas-liquid turbulence mutually rubs and shears to continuously enhance mass transfer.

2. Polymer Tower Body Eliminates Corrosion

Traditional absorption towers use carbon steel lined with anti-corrosion flakes, with a service life of generally 1–3 years and requiring regular anti-corrosion maintenance. The DS Multiphase Reactor tower body is made of polymer material with a service life of 15–30 years, requiring no anti-corrosion treatment. This greatly improves the synchronized operation rate of the desulfurization system and reduces costs.

3. Nozzle-Free Design Prevents Clogging

Traditional absorption towers use nozzles to atomize absorbent slurry, causing long-term scaling and clogging of nozzles and pipelines. The DS Multiphase Reactor adopts a large-channel structural design, completely eliminating scaling and clogging issues, effectively reducing circulation pump head, saving power consumption, and ensuring efficient and stable FGD operation with virtually no maintenance costs attributable to clogging.

4. High-efficiency desulfurization — saves costs.

Traditional absorption towers have short gas-liquid contact time. The multiphase reactor has a gas-liquid contact time more than twice that of traditional absorption towers, effectively reducing the liquid-to-gas ratio by more than one-third.

 

Inner Mongolia XX Coal Chemical Co., Ltd. — 2.1 Mt Coking Project 3×75 t/h Boiler Flue Gas Desulfurization Project (2015)

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