Inside the DT Desulphurization FGD Pumps: real-world notes from the field

I’ve walked more than a few scrubber decks, and I’ll say this up front: a flue gas desulfurization pump either earns its keep… or it eats budgets. The DT/TL series from Shifo Town, Anguo City, Hebei Province has been making the rounds lately—actually showing up in tenders that used to go automatically to the “big four.” That caught my eye.

What’s changing in FGD pumping

Tighter SO₂ caps, rising chloride loadings in slurry loops, and relentless pressure on OPEX—those are the three forces. Plants are nudging toward duplex stainless wetted parts, smarter sealing (double mechanical seals with pressurized plans), and VFDs to stay near BEP. There’s also a quiet—but real—uptick in composite coatings to push efficiency a point or two. To be honest, it’s the boring stuff that saves the money.

DT/TL at a glance (field-oriented specs)

How the DT/TL is built (and tested)

• Wetted parts: choice of duplex stainless for chloride-rich liquor or A05 for abrasion; optional rubber linings for scaling control.
• Impeller: closed, wear rings available; dynamic seal or double mechanical seal (SiC–SiC or TC–SiC) with API Plan 53A style logic.
• Bearings: heavy-duty, grease or oil bath; shaft deflection kept low at BEP.
• Shop tests: Hydraulic per ISO 9906 Grade 2B; hydrostatic at 1.5× design; NDE on castings per ASTM A903/A890 practices.
• Corrosion checks: chloride pitting screening similar to ASTM G48; slurry abrasion per ASTM G75 concepts.
• Expected service life: casing/volute 5–8 years; impeller/liners 12–24 months in typical duty (honestly depends on solids and pH).

Where these pumps make sense

Coal-fired power FGD loops, waste-to-energy absorbers, nonferrous smelter scrubbers, and even some marine scrubber retrofits. Many customers say the flue gas desulfurization pump behaves best when run 10–15% right of BEP, with a VFD trimming night-time loads.

Vendor snapshot (neutral, practical view)

Customization, compliance, feedback

Options include impeller trims for duty-point matching, duplex upgrades for Cl⁻ > 20,000 mg/L, ceramic coatings on cutwater, and seal plan packages. Certifications: ISO 9001 quality, CE marking where applicable. Factory testing to ISO 9906; design practices reference ISO 5199 concepts for robustness. In a Hebei WtE plant, operators reported 18 months MTBF on the flue gas desulfurization pump rotating assembly; efficiency held within 2–3 points after 9 months (solids ≈22% wt, pH 5.2).

Two quick case notes

• 300 MW coal unit: DT350 with duplex wetted parts; slurry 1.32 SG; achieved 71% wire-to-water at commissioning, NPSHr margin 1.8 m, liner swap at 16 months.
• Smelter FGD: TL250 rubber-lined; frequent scaling previously—after switching, ΔP stabilized; operators set VFD min-flow logic to avoid off-BEP recirculation.

If you’re choosing a flue gas desulfurization pump, focus on corrosion currency (chlorides and temperature), sealing plan discipline, and keeping your duty point honest. Sounds simple; saves fortunes.

Authoritative citations

1. ISO 9906:2012 – Rotodynamic pumps — Hydraulic performance acceptance tests.
2. ISO 5199:2002 – Technical specifications for centrifugal pumps (Class II).
3. ASTM A890/A890M – Castings, iron-chromium-nickel-molybdenum, duplex stainless steel.
4. US EPA, Flue Gas Desulfurization (FGD) Control — technical overview and performance trends.