DEC Phase II Project: Integrated High-Temperature Dust Removal Filtration System

Project Background:

Dongfang Electric Corporation (DEC), a leading energy equipment manufacturer in China, remains at the forefront of clean energy and high-efficiency boiler technologies. In a large-scale biomass gasification and CHP (Combined Heat and Power) Phase II expansion project, process gas/flue gas must undergo precision dust removal at high temperatures before entering heat exchangers or gas turbines. Building on the stable performance of Unite’s filtration equipment in Phase I, Phase II continues to utilize and upgrade our high-temperature dust removal solutions to meet stricter environmental emission standards and system thermal efficiency requirements.

Core Challenges:

• Extreme Temperature Conditions: Operating temperatures typically range from 350°C to 600°C, where ordinary filter media are prone to thermal damage or structural failure.
• Fine Dust Interception: Dust particles are minute with fluctuating concentrations, requiring the filter to achieve over 99.9% separation efficiency at extremely low pressure drops.
• Chemical Corrosion & Thermal Shock: The flue gas contains complex acidic components, and the system faces significant thermal shock during start-up and shutdown cycles.
• High Reliability Requirements: As a core component of the Phase II expansion, the dust removal system must support 24/7 continuous operation, with zero tolerance for dust leakage that could damage downstream precision equipment.

Our Solution:

Tailored to the process characteristics of DEC Phase II, we provided a customized high-temperature precision dust removal filtration solution:

• Advanced High-Temp Filter Elements: Utilizing high-temperature resistant ceramic fiber filter tubes or sintered porous metal materials as the core elements. These materials offer superior temperature resistance (up to 600°C+) and chemical stability, effectively intercepting sub-micron dust.
• Intelligent Pulse-Jet Cleaning System: Equipped with an independently developed high-temperature pulse-jet cleaning mechanism. Controlled by PLC, it uses instantaneous high-pressure gas for online cleaning of filter tubes, enabling media regeneration without downtime and maintaining constant system pressure differential.
• Hermetic Heat-Resistant Structural Design: The filter vessel is constructed from specialty heat-resistant steel with comprehensive insulation layers, reducing heat loss while ensuring safety in the operating area.
• Integrated System Control: The Phase II system is deeply integrated into DEC’s central control room (DCS), achieving real-time online monitoring of temperature, pressure drop, and emission indicators.

Customer Value & Results:

Since the DEC Phase II high-temperature dust removal project was put into operation, dust emission indicators have been stably controlled below 5mg/Nm³, far outperforming national ultra-low emission standards. The high-temperature filtration capability has increased heat recovery efficiency by approximately 10%, significantly reducing overall energy loss. Phase II not only continues the high reliability of Phase I but also achieves breakthroughs in automated management. DEC highly commended Unite’s technical responsiveness and delivery capabilities under extremely complex conditions, and this project has become a demonstration for green upgrading in the large-scale power equipment industry.