Product Description
Engineered at our Jingjiang manufacturing base, our Diesel Hydrotreating Unit Furnace is a specialized high-pressure fired heater designed to elevate blends of straight-run diesel, light cycle oil (LCO), and coker gas oil mixed with high-pressure hydrogen treat gas up to catalytic hydrodesulfurization (HDS) reaction thresholds. Incorporating our 26-year manufacturing pedigree and extensive track record supporting PetroChina and Sinopec refinery clean-fuel upgrades, we construct each Diesel Hydrotreating Unit Furnace to deliver robust defense against High-Temperature Hydrogen Attack (HTHA) and polythionic acid stress corrosion. Featuring heavy-wall stabilized austenitic alloy coils, balanced multi-phase hydraulic pass arrangements, and automated flame-flux control, our heaters maintain tight process temperature bands while keeping coil wall temperatures safely below material metallurgical limits, providing refiners with a dependable heating platform for Euro VI ultra-low sulfur diesel production.
Applications
Ultra-Low Sulfur Diesel (ULSD) Production: Heating mixed diesel feed and recycle hydrogen streams from 240°C to 340°C–380°C before entering hydrotreating fixed-bed reactors.
Hydrodearomatization & Cetane Improvement Units: Supplying stable thermal input to saturate polycyclic aromatics and improve diesel cetane numbers.
Product Fractionation Stripper Reboilers: Providing clean, regulated reboil heat to stripper bottoms to drive off dissolved hydrogen sulfide (H2S) and light ends.
Cracked Middle-Distillate Hydrofinishing: Coping with challenging feeds containing olefinic, nitrogenous, and sulfur-rich coker diesel distillates.
Technical Specifications
|
Design Codes |
API 560, API RP 941 (Nelson Curve Compliance), ASME Section VIII Div. 1, ASME B31.3 |
|
Structural Types |
Vertical cylindrical fired heater with all-radiant helical or serpentine coils, or compact horizontal-tube box heater |
|
Thermal Duty Range |
3 MW to 35 MW |
|
Design Operating Pressure |
4.5 MPa to 11.0 MPa (Engineered for medium-to-high pressure hydroprocessing loops) |
|
Process Outlet Temperature |
330°C to 395°C; Radiant tube metal design temperature up to 580°C |
|
Radiant Coil Metallurgy |
Stabilized austenitic stainless steel (ASTM A312 / A213 TP321H, TP347H) and Cr-Mo alloy (A335 P22) |
|
Welding Standards |
ASME Section IX qualified, low-heat-input GTAW/GMAW with argon backing and strict ferrite number control (3%–8%) |
|
Efficiency Rating |
90% – 93% (Equipped with air preheaters or boiler feed water preheating coils) |
Customization Capabilities
Nelson-Curve Compliant Thickness Sizing: Coil wall thicknesses engineered strictly in accordance with API RP 941 curves, incorporating conservative hydrogen partial pressure safety margins.
Anti-Slugging Two-Phase Flow Layouts: Radiant and convection pass geometry optimized to maintain annular mist flow, preventing liquid-gas phase separation, surging, and local tube overheating.
Neutralization Wash Manifolds: Pre-installed wash connections allowing alkaline nitrate neutralization flushing during shutdowns to eliminate polythionic acid stress corrosion cracking (PASCC).
Complete Modular Pre-Assembly: Vertical radiant shells and convection modules fully refractory-lined in-shop with ceramic fiber modules, lowering field welding and scaffolding costs.
Zero MOQ Flexibility: Fabricating individual custom heater units for plant turnarounds as well as multi-unit orders for greenfield refinery blocks.
Quality Control
Certified Quality Standards: Certified under ASME "U" and "S" stamps, ISO 9001:2015, and ISO 3834-2 International Welding Quality System.
Component-Level QR Code Traceability: Every alloy tube section, forged high-pressure elbow, support hanger, and nozzle neck carries an individual QR code linked to certified mill test reports and heat treatment records.
100% Volumetric & Surface Inspection: 100% Radiographic Testing (RT) and Liquid Penetrant Testing (PT) across all alloy butt welds; 100% Positive Material Identification (PMI) on all incoming and welded metallurgy.
Hydrostatic Pressure Proof: High-pressure hydrostatic proof testing performed in our specialized testing bay at 1.5 times design pressure, using demineralized water with chloride content < 25 ppm.
Ocean Export Packaging: Sealed transport skids with internal mechanical vibration dampening, desiccants, and weatherproof vacuum-barrier wraps.
FAQ
Q: How do you prevent High-Temperature Hydrogen Attack (HTHA) and polythionic acid cracking on hydrotreater coils?
A: We select stabilized grades such as TP321H or TP347H strictly in compliance with API RP 941 guidelines, control weld ferrite content to prevent sigma phase embrittlement, and provide comprehensive shutdown wash-procedure documentation to neutralize acidic surface residues.
Q: What is your standard production lead time for a high-pressure diesel hydrotreating heater?
A: Complete custom heater fabrication typically requires 4 to 5 months from approved engineering drawings and alloy plate/pipe delivery to final pressure testing.
Q: What after-sales and field commissioning support do you provide overseas?
A: We provide dispatch-ready field advisory engineers to guide on-site rigging, refractory dry-out, and pre-commissioning checkout, backed by an 18-month warranty from site arrival or 12 months from commercial operation (whichever occurs first).
Q: What are your accepted payment and commercial terms?
A: We operate under EXW and FOB terms. Our standard commercial terms are 30% advance deposit, 40% manufacturing milestone payment upon core NDT completion, and 30% final balance prior to shipment, payable in USD, EUR, or RMB.
Hot Tags: diesel hydrotreating unit furnace, China diesel hydrotreating unit furnace manufacturers, suppliers, factory, heating furnace discharge equipment, heating furnace skid system, hot rolling reheating furnace, reformer furnace, reheating furnace combustion system, water cooled furnace skid
