Tail Gas Heater for Nitric Acid Plants

Product Specifications

Technical details and manufacturing context for Tail Gas Heater

Definition

The Tail Gas Heater is a component used in integrated nitric acid production and concentration systems. Its primary function is to recover waste heat from the tail gas stream exiting the absorption column. This thermal energy is transferred to incoming process streams, typically the air feed to the ammonia oxidation reactor or other process fluids, thereby reducing overall energy consumption and improving thermal efficiency. The heater operates as a shell-and-tube or plate heat exchanger, with hot tail gas (primarily nitrogen, oxygen, and residual NOx) flowing on one side and a cooler process stream on the other. Heat transfer occurs through conduction across the tube or plate walls. Typical design parameters include a design pressure of 1.0–1.6 MPa, design temperature of 200–450°C, heat transfer area of 20–200 m², and tube bundle length of 3000–6000 mm. Materials of construction may include stainless steel (304L, 316L) and nickel alloys for high-temperature or corrosive sections. The design code is typically GB/T 151, with pressure vessel design per GB/T 150. Verification of model-specific values and standards with the legal manufacturer or supplier is essential before procurement or installation.

Working Principle

Hot tail gas from the absorption column flows through one side of the heat exchanger, while a cooler process stream, such as combustion air, flows on the opposite side. Heat is transferred from the tail gas to the process stream through conduction across the heat exchanger tubes or plates, preheating the incoming fluid before it enters subsequent process stages. This reduces the energy required for heating the process stream, improving overall plant efficiency.

Common Materials

Stainless Steel (e.g., 304L, 316L), Nickel Alloys (for high-temperature/corrosive sections)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Design Pressure	1.0–1.6 MPa	GB/T 150
Design Temperature	200–450 °C	Above 450°C material creep becomes significantGB/T 150
Heat Transfer Area	20–200 m²	Select based on required duty
Tube Material	304L/316L	Higher alloys for corrosive environmentsASTM A312
Shell Material	Q345R/304	Carbon steel for non-corrosive serviceGB/T 713
Tube Wall Thickness	2.0–3.0 mm	Thicker for higher pressureASTM A312
Shell Wall Thickness	8–16 mm	Determined by pressure and diameterGB/T 150
Tube Bundle Length	3000–6000 mm	Longer tubes increase efficiency but require more space
Number of Tube Passes	1–2	More passes increase velocity and heat transfer
Design Code	GB/T 151	Chinese standard for heat exchangersGB/T 151
Leak Test Pressure	1.5×design MPa	Hydrostatic test per codeGB/T 150
Weight	2000–15000 kg	Affects installation and foundation

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 / Plate Pack
Provides the primary surface for conductive heat transfer between the two fluid streams.

Material: Stainless Steel or Nickel Alloy
Shell / Casing Part
Encloses the tube bundle or plates, contains the shell-side fluid, and provides structural support.

Material: Carbon Steel or Stainless Steel
Tube Sheets / Headers Part
Secures the ends of the tubes or channels the plate-side fluid, separating the two fluid streams.

Material: Stainless Steel or Forged Carbon Steel

Manufacturers of Tail Gas Heater

Manufacturer profiles associated with Tail Gas Heater.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the typical design pressure range for a Tail Gas Heater?

The design pressure is typically in the range of 1.0–1.6 MPa, as per GB/T 150. However, the exact value must be confirmed for the specific model and application.

What materials are commonly used for the tubes and shell?

Tube material is often stainless steel 304L or 316L, while shell material may be Q345R or 304. Nickel alloys may be used for high-temperature or corrosive sections. Confirm material suitability with the manufacturer.

How does the Tail Gas Heater improve energy efficiency?

It recovers heat from the hot tail gas stream and transfers it to a cooler process stream, such as combustion air, preheating it. This reduces the energy needed for heating, lowering overall energy consumption.

What standards apply to the design and testing?

The design typically follows GB/T 151 for heat exchangers and GB/T 150 for pressure vessels. Leak test pressure is 1.5 times the design pressure. Always verify compliance with the manufacturer.

Data Basis

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

Preliminary Technical Classification

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pressure:	Up to 10 bar (145 psi) operating pressure
flow rate:	10,000-100,000 Nm³/h (5,900-59,000 SCFM)
temperature:	Up to 600°C (1112°F) inlet, typical ΔT 100-300°C
slurry concentration:	Not applicable - gas phase only, particulate loading <50 mg/Nm³

Tail Gas Heater

Product Specifications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards