What products are included in boiler steel structures?
Category: Company News
Time: 2025-05-20
The boiler steel structure is a metallic structural system that supports the boiler body and its auxiliary equipment. Based on function, application scenario, and structural configuration, it can be classified into the following major product types:
Core component products classified by structural function
1. Load-bearing support system
Column (support column)
Types: H‑section steel columns, box‑section columns, and circular tubular columns (for large‑span applications);
Specifications: Cross-sectional dimensions are determined by load calculations; for example, columns in power‑plant boilers may reach 800×800 mm, while industrial boilers typically use sections no larger than 400×400 mm.
Function: To withstand vertical loads (the weight of the boiler body) and horizontal loads (wind and seismic forces).
Beam (support beam)
Types: H‑section solid-web beams, truss‑type cross beams (for large spans, e.g., >10 m), and lattice‑type cross beams;
Materials: Q355B/C high-strength steel (yield strength ≥ 355 MPa); Q420 is used for critical components.
Function: Supports the boiler’s heating surfaces (such as the steam drum and water-cooled walls) and transmits loads to the columns.
2. Stability Support System
Vertical bracing (wind-resistant bracing)
Form: cross steel tie rods (flexible bracing), angle steel/channel steel rigid bracing;
Function: To resist lateral wind loads and seismic forces, thereby maintaining the longitudinal stability of the frame.
Horizontal bracing (planar bracing)
Arrangement: Within the plane of each floor’s frame, angle steel or round steel is arranged in a crossed pattern.
Function: Prevents in-plane deformation of the frame and transmits horizontal forces.
3. Enclosure and Ancillary Systems
Guard plates and insulation structure
Composition: outer steel plate (thickness 3–5 mm) + intermediate insulation layer (rock wool, aluminosilicate fiber, thickness 50–100 mm) + inner sealing panel;
Functions: thermal insulation and sealing, reducing heat loss (thermal efficiency ≥ 90%).
Platform and Stairs
Structure: Grating platform (load-bearing capacity ≥ 3 kN/m²) + steel staircase + guardrail (height ≥ 1.2 m);
Function: Provides access for maintenance and inspection, complying with safety standards (e.g., GB 4053 “Safety Requirements for Fixed Steel Ladders and Platforms”).
Expansion compensation device
Type: Sliding bearings, spring hangers, expansion joints;
Function: Accommodates boiler thermal expansion (expansion up to 50–100 mm) and prevents stress concentration in the structure.
Products classified by manufacturing process and installation method
Modular steel structural components
Form: Factory‑prefabricated integrated module comprising “columns + beams + bracing” (dimensions 2–5 meters), with on‑site bolted connections.
Advantages: Reduced on-site welding by more than 50%, and shortened installation timelines (e.g., in power‑plant projects, from 90 days to 60 days).
Customized non-standard parts
Scenario: Alien boiler interface, special load conditions (e.g., high temperature, high pressure);
Example: Asymmetric frame structure; support components for a waste-heat boiler with arc-shaped guard plates.
Special Products Classified by Material and Performance
Weathering steel structure
Materials: Weathering steels such as Q355NHD and Q460NH, which form an oxide protective layer on the surface to resist atmospheric corrosion.
Applications: Boilers installed in open-air settings and projects located in coastal areas.
High-strength steel structure
Materials: Q420 and Q460 high-strength steels, which reduce steel consumption by 15%–20% compared to Q355.
Scenario: Large-span beams and ultra-supercritical power plant boilers.
Fire-resistant steel structure
Treatment: Apply a fire-resistant coating to the surface (fire-resistance rating ≥ 2 hours);
Applications: Waste incineration boilers and industrial boilers located near heat sources.
Keywords: What products are included in boiler steel structures?
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