Waste Heat Boiler for Nitric Acid Production

Product Specifications

Technical details and manufacturing context for Waste Heat Boiler

Definition

The Waste Heat Boiler is a specialized component within an Integrated Nitric Acid Production and Concentration System. Its primary function is to capture thermal energy from high-temperature process gases, typically originating from ammonia oxidation or other exothermic reactions, and transfer that energy to water to generate steam. This steam can be utilized for process heating, power generation, or other plant utilities, thereby significantly improving overall energy efficiency.

Constructed from materials such as stainless steel (e.g., 304/316L), carbon steel, or alloy steel, the boiler is designed to withstand demanding operating conditions. Key parameters include a rated steam capacity of 10–100 t/h, operating pressure of 1.0–1.6 MPa, and steam temperature of 184–204°C. The hot process gas enters at 800–1000°C and exits at 300–400°C, optimized for downstream absorption. The heat transfer area ranges from 100–500 m², and the design pressure is 1.6–2.0 MPa (per GB/T 16507) with a design temperature of 250–350°C. Tube material is typically SA-106 Gr.B (ASTM A106), and shell material is SA-516 Gr.70 (ASTM A516). The boiler weighs 20–80 tons and has dimensions of 5–15 m × 2–4 m × 3–6 m (L×W×H).

These values are reference ranges for directory purposes and must be verified for the specific model and application with the legal manufacturer or supplier. Standards listed are procurement references, not certifications of compliance. The boiler is a component, not a standalone system, and its integration requires careful engineering review.

Working Principle

Hot process gases from an ammonia oxidation reactor flow through tubes or a heat exchange section, transferring thermal energy to water circulating in the boiler shell. The heated water vaporizes into steam, which is collected and directed to turbines, heat exchangers, or other steam-consuming equipment. The cooled gases exit for further processing. The boiler operates under pressure, with safety margins incorporated into the design pressure and temperature. Proper water level and steam quality must be maintained to prevent damage. Regular inspection of tubes, welds, and pressure parts is essential. Failure to maintain water chemistry or control temperatures can lead to tube failure or thermal stress.

Common Materials

Stainless Steel (e.g., 304/316L), Carbon Steel, Alloy Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Steam Capacity	10–100 t/h	Matches nitric acid plant acid production rate
Steam Temperature	184–204 °C	Saturated steam at operating pressure
Gas Inlet Temperature	800–1000 °C	Hot process gas from ammonia oxidation
Gas Outlet Temperature	300–400 °C	Optimized for downstream absorption
Heat Transfer Area	100–500 m²	Determines steam generation capacity
Design Pressure	1.6–2.0 MPa	Exceeds operating pressure for safetyGB/T 16507
Design Temperature	250–350 °C	Based on maximum expected metal temperature
Tube Material	SA-106 Gr.B	Carbon steel for high-temperature serviceASTM A106
Shell Material	SA-516 Gr.70	Carbon steel plate for pressure vesselsASTM A516
Weight	20–80 t	Affects foundation and installation
Dimensions (L×W×H)	5–15×2–4×3–6 m	Customized to plant layout

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Tube Bundle
Primary heat exchange surface where hot gases transfer energy to water/steam

Material: Stainless Steel
Steam Drum
Separates steam from water and stores water for circulation

Material: Carbon Steel
Mud Drum
Collects sludge and sediments from the boiler water

Material: Carbon Steel
Water Level Control
Keeps the drum water level in band; losing it is what burns the tubes.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Gas Reforming Unit

View system integration details

Manufacturers of Waste Heat Boiler

Manufacturer profiles associated with Waste Heat Boiler.

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Frequently Asked Questions

What is the typical steam capacity range for this boiler?

The rated steam capacity is typically between 10 and 100 t/h, matching the acid production rate of the nitric acid plant. The exact value depends on the specific plant design and must be confirmed with the manufacturer.

What materials are commonly used for the boiler tubes and shell?

Common materials include stainless steel (304/316L), carbon steel, and alloy steel. For high-temperature service, tubes are often SA-106 Gr.B (ASTM A106), and the shell is typically SA-516 Gr.70 (ASTM A516). Material selection depends on operating conditions and must be verified.

What are the design pressure and temperature ratings?

The design pressure is typically 1.6–2.0 MPa (per GB/T 16507), exceeding the operating pressure of 1.0–1.6 MPa for safety. The design temperature is 250–350°C, based on maximum expected metal temperature. These values are reference ranges and must be confirmed for the specific model.

How does the boiler improve energy efficiency in a nitric acid plant?

By recovering waste heat from hot process gases (800–1000°C) and generating steam, the boiler reduces the need for external fuel or steam generation. The steam can be used for process heating or power generation, lowering overall energy consumption and operational costs.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Gas side: 0.5-2.5 bar, Steam side: 10-40 bar
flow rate:	Gas: 10,000-100,000 Nm³/h, Water/steam: 5-50 t/h
temperature:	Inlet gas: 800-1100°C, Steam: 150-400°C
slurry concentration:	Not applicable (gas-phase system)

Waste Heat Boiler

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards