China Biogas Heat Exchanger Manufacturer for Anaerobic Digestion

China Biogas Heat Exchanger Manufacturer for Anaerobic Digestion

Center Enamel delivers heat recovery and digester-heating solutions for biogas and anaerobic digestion (AD) systems, combining heat exchangers with glass-fused-to-steel (GFS) digester tanks and AD system support built for corrosive biogas environments.

Anaerobic digestion depends on holding the digester at a stable mesophilic temperature (about 35 to 38 C) and recovering heat from combined heat and power (CHP) exhaust, so heat exchange is central to plant efficiency.

Heat Recovery in Biogas and AD

Biogas plants use heat exchangers to warm incoming feedstock and the digester, and to recover CHP exhaust heat. Efficient heat recovery raises net energy output and stabilizes digestion.

Exchanger Solutions for AD

• Digester heating: External plate or shell-and-tube exchangers holding 35 to 38 C.
• Slurry heating: Wide-gap plate handling fibrous feedstock.
• CHP exhaust recovery: Gas-to-water exchangers boosting overall efficiency.
• Pasteurization: Heat exchangers for pathogen reduction where required.

Materials for AD Slurry and Biogas

• 304 / 316L stainless: For corrosion from biogas, H2S, and acidic slurry.
• Coatings: Protective systems on mild-steel parts.
• Traceability: Mill certs and PMI on stainless.

Integration with AD Systems

• GFS digester tanks: Corrosion-resistant bolted tanks for the digester.
• Biogas holder and piping: Gas collection and recirculation.
• Controls: Temperature and flow management for stable digestion.

Biogas AD Heat Exchanger Needs

Biogas and AD heat recovery is both a corrosion and a control problem. Center Enamel combines stainless heat exchangers with GFS digester tanks and AD system experience to support stable, efficient digestion.

Project Case Study

Project Background

Aquaculture wastewater across several Chinese provinces was treated by anaerobic digestion, a process that generates biogas, demonstrating the company AD and corrosion-environment experience relevant to biogas systems.

Project Requirements

• Tank fleet: Multiple digester tanks from about 4.9 m to 7.6 m diameter across provinces.
• Throughput: 15 to 35 m3/h of wastewater per site.

Technical Challenges

Corrosive biogas and slurry, plus multi-site deployment, required corrosion-resistant tank construction and consistent fabrication.

Solution and Relevance

Anaerobic digester tanks were supplied for the wastewater-to-biogas process. The same AD and corrosion-environment experience underpins the company biogas heat-recovery exchangers. No biogas-heat-exchanger-specific project is claimed.

About Shijiazhuang Zhengzhong Technology Co., Ltd (Center Enamel)

Center Enamel supplies anaerobic digestion and biogas system components, including glass-fused-to-steel digester tanks and stainless heat-transfer equipment for corrosive service.

With documented AD project experience across multiple Chinese provinces, the company supports biogas plants with corrosion-resistant tanks and heat-recovery equipment.

• AD products: GFS digester tanks, biogas holders, heat exchangers.
• Materials: 304/316L stainless, GFS, protected mild steel.
• Experience: Multi-province anaerobic digestion projects.

Frequently Asked Questions (FAQ)

What heat exchangers are used in biogas plants?

Digester heating exchangers (plate or shell-and-tube), wide-gap plate for slurry, and gas-to-water exchangers for CHP exhaust recovery.

Why is digester temperature controlled?

Mesophilic digestion is most efficient near 35 to 38 C; stable temperature improves gas yield and process reliability.

Which materials resist biogas corrosion?

304 or 316L stainless for H2S and acidic slurry, with protective coatings on mild-steel components.

Does the company build digester tanks?

Yes, glass-fused-to-steel digester tanks are part of the AD offering, with documented multi-province project experience.

What information is needed for a quotation?

Feedstock type, flow, target digester temperature, biogas use, and site conditions.

Can equipment be built to code?

Yes, fabrication follows applicable national and international codes with full documentation as specified.

Submit your feedstock, flow, and temperature profile for a biogas heat-recovery and digester configuration.