What products are included in boiler steel structures?

Core components classified by structural function

1. Load-bearing support system

Columns (support columns)

Types: H-section columns, box-section columns, circular columns (for large spans);

Specifications: Cross-sectional dimensions are calculated based on load, such as power plant boiler columns can reach 800×800mm, industrial boilers commonly use 400×400mm or less;

Function: To bear vertical loads (boiler weight) and horizontal loads (wind, earthquake).

Beams (support beams)

Types: H-section solid web beams, truss beams (large spans, such as >10 meters), lattice beams;

Material: Q355B/C high-strength steel (yield strength ≥355MPa), important components use Q420;

Function: To support the boiler heating surface (such as steam drum, water wall), and transfer the load to the columns.

2. Stability support system

Vertical support (wind support)

Form: Cross steel tie rods (flexible support), angle steel/channel steel rigid support;

Function: To resist horizontal wind and earthquake forces, maintaining the longitudinal stability of the frame.

Horizontal support (planar support)

Arrangement: Within each floor frame plane, using angle steel or round steel cross arrangement;

Function: To prevent frame plane deformation, and transfer horizontal forces.

3. Enclosure and auxiliary system

Cladding and insulation structure

Composition: Outer steel plate (thickness 3-5mm) + middle insulation layer (rock wool, aluminum silicate fiber, thickness 50-100mm) + inner sealing plate;

Function: Heat insulation, sealing, reducing heat loss (insulation efficiency ≥90%).

Platforms and stairs

Structure: Grating platform (load-bearing ≥3kN/m²) + steel stairs + guardrails (height ≥1.2 meters);

Function: To provide maintenance access, meeting safety standards (such as GB 4053 "Safety requirements for fixed steel ladders and platforms").

Expansion compensation device

Types: Sliding bearings, spring hangers, expansion joints;

Function: To adapt to boiler thermal expansion (expansion amount can reach 50-100mm), avoiding structural stress concentration.

Products classified by manufacturing process and installation method

Modular steel structure components

Form: Factory prefabricated "column + beam + support" integrated modules (size 2-5 meters), on-site bolted connection;

Advantages: Reduce on-site welding (reduce more than 50%), shorten installation cycle (such as power plant projects from 90 days to 60 days).

Customized non-standard parts

Scenario: Irregular boiler interfaces, special load conditions (such as high temperature, high pressure);

Example: Asymmetric frame structure, waste heat boiler support with arc-shaped cladding.

Special products classified by material and performance

Weathering steel structure

Material: Q355NHD, Q460NH and other weathering steels, forming an oxide protective layer on the surface, resistant to atmospheric corrosion;

Application: Outdoor boilers, coastal projects.

High-strength steel structure

Material: Q420, Q460 high-strength steel, reducing steel consumption by 15%-20% compared to Q355;

Scenario: Large-span beams, supercritical power plant boilers.

Fire-resistant steel structure

Treatment: Surface coated with fire-retardant paint (fire resistance limit ≥2 hours);

Application: Garbage incineration boilers, industrial boilers near the fire source.