Equipment-specific anchor solutions for CFBC boilers, HRSG systems, waste-to-energy incinerators, biomass units, and conventional thermal power stations. Engineered for thermal cycling, bed material erosion, and the demanding availability requirements of power generation.
Power generation demands maximum uptime. Refractory anchor failure in a boiler can force 2–4 weeks of unplanned outage. Here's how to get anchor selection right for every equipment type.
CFBC (Circulating Fluidized Bed Combustion) boilers are the most refractory-intensive boiler type. The cyclone separator interior faces severe erosion from circulating bed material at high velocity. The combustion chamber lower section, loop seal, and return leg all require abrasion-resistant castable with dense anchor patterns. Membrane water walls use thin refractory held by stud-welded anchors to smooth corners and protect against erosion.
AFBC (Atmospheric Fluidized Bed Combustion) boilers operate at lower temperatures than CFBC but still face bed material erosion in the combustion chamber and freeboard zone. The air distributor plate area requires heavy-duty anchoring for abrasion-resistant castable. Overbed and underbed fuel feed systems use castable with SS310 anchors to resist thermal shock from intermittent feeding.
Heat Recovery Steam Generators capture waste heat from gas turbine exhaust. The transition duct from gas turbine to HRSG operates at 550–650°C with extremely high gas velocities (up to 37 m/s) that can erode poorly anchored linings. Ceramic fiber modules with twist-lock anchors are standard for HRSG ducts. Castable sections at penetrations and transitions use Y-type SS310 anchors. The stack section uses SS304 for lower temperatures.
Waste-to-energy (WtE) incinerators face the most chemically aggressive environment in power generation — chlorides, alkalis (K₂O, Na₂O), heavy metals, and acidic flue gases from burning municipal solid waste. SiC-based castable with anti-alkali properties is the standard lining material. Anchors must resist both high temperature and chemical attack, making SS310 the minimum specification with Inconel 600 for the hottest zones near the combustion grate.
Biomass combustion produces high levels of potassium and sodium vapors that penetrate refractory and cause accelerated degradation through alkali-silicate reactions. This is especially severe in cyclone target walls and superheater zones. High-purity mullite-based castables with SS310 corrugated anchors resist alkali attack. Anchor spacing must be tighter than in coal-fired boilers due to the weakening effect of alkali penetration on the castable-anchor bond.
Conventional pulverized coal (PC) and gas-fired boilers use refractory primarily for seals, penetrations, burner throats, windbox areas, and ash hoppers rather than full wall linings. Burner throats require dense castable with closely-spaced SS310 anchors to resist flame impingement. Air preheaters use SS304 for moderate temperatures. Ash hoppers require abrasion-resistant castable with V-type SS310 anchors.
Standard for boiler walls, ducts, cyclones. Corrugated arms for abrasion-resistant castable grip.
Details →Heavy-duty for combustion chambers, grate sidewalls, ash hoppers, burner throats.
Details →For CFBC membrane walls, HRSG fiber modules, thin-layer refractory applications.
Details →Twist-lock, cup-lock for fiber. Expansion joint anchors. Build-to-print per OEM drawings.
Submit Drawing →| Equipment | Temp | Grade | Rationale | Anchor Type |
|---|---|---|---|---|
| CFBC Cyclone Interior | 900–1100°C | SS 310 | Erosion + oxidation, sustained high temp | Y-type corrugated |
| CFBC Membrane Walls | 850–950°C | SS 310 | Thin layer on tubes, needs stud weld | Stud-welded |
| CFBC Loop Seal | 850–950°C | SS 310 | Bed material circulation erosion | V-type |
| AFBC Combustion Chamber | 800–950°C | SS 310 | Bed abrasion + moderate temp | Y-type |
| HRSG Transition Duct | 550–650°C | SS 310 | High velocity gas (37 m/s) erosion | Y-type corrugated |
| HRSG Stack | 200–400°C | SS 304 | Lower temp, cost-effective | Y-type |
| WtE Combustion Chamber | 900–1200°C | SS 310 | Chloride + alkali corrosion resistance | Y-type corrugated |
| WtE Grate Sidewalls | 1000–1200°C | Inconel 600 | Direct flame + chemical attack | V-type |
| Biomass Cyclone | 850–1050°C | SS 310 | Alkali vapor penetration resistance | Y-type corrugated |
| Coal Boiler Burner Throat | 1000–1100°C | SS 310 | Direct flame impingement | V-type |
| Ash Hopper | 600–800°C | SS 310 | Abrasion from ash + clinker | V-type |
The power generation industry relies on refractory linings to protect boiler components from extreme temperatures, fuel ash erosion, and corrosive flue gases. Within this sector, CFBC boilers are the most refractory-intensive — a single large CFBC unit can contain thousands of anchors across its cyclones, combustion chamber, loop seals, and membrane water walls.
Santura Engineering has supplied refractory anchors to thermal power stations, combined cycle plants, waste-to-energy facilities, and biomass units across India, the Middle East, Europe, and Southeast Asia. Our deep understanding of boiler operating conditions — from the high-velocity erosion in CFBC cyclones to the alkali attack in biomass furnaces — drives precise anchor recommendations for every application.
Circulating fluidized bed boilers are particularly challenging for refractory systems because circulating bed material (sand, limestone, ash) continuously impacts the lining at high velocity. The cyclone separator, where particles are separated from flue gas, experiences the most severe erosion. Refractory anchor systems in CFBC cyclones must be designed with tight spacing (200–250mm), corrugated arms for maximum grip, and SS310 material to withstand both erosion and oxidation at 900–1100°C.
The global shift toward renewable fuels — biomass, refuse-derived fuel (RDF), and municipal solid waste — is creating new refractory challenges. These fuels produce alkali vapors (potassium, sodium), chlorides, and heavy metals that aggressively attack both refractory and anchor materials. SS310 is the minimum specification for these applications, with Inconel 600 required in the hottest zones of waste-to-energy combustion chambers.
In power generation, unplanned outages cost operators millions in lost revenue and penalty charges. A single CFBC cyclone refractory failure can force 2–4 weeks of downtime. Proper anchor selection — using the right material grade, anchor type, and spacing for each zone — is one of the most cost-effective reliability investments a power plant can make. The marginal cost of specifying SS310 corrugated anchors instead of SS304 in a CFBC cyclone is negligible compared to the cost of one unplanned outage.
We supply a complete range of anchors for every power plant application — from standard Y-type anchors for boiler ductwork to custom stud-welded SS310 anchors for CFBC membrane walls. Our annual capacity of 5 million+ anchors and ready stock of SS304 and SS310 ensure we can support both planned outage schedules and emergency breakdown requirements. We also supply to boiler OEMs including BHEL, Thermax, L&T, Doosan, and Babcock & Wilcox.
Send your boiler zone specifications or OEM drawings and receive a detailed quote within 24 hours. We serve both power plant operators and boiler manufacturers worldwide.