Hot Water Boiler for CBG Plant
Optimized Digester Heating | Maximizing Methane Yield with Precision Control
At IndianBoilers.com, we understand that the heart of a Compressed Biogas (CBG) plant is its anaerobic digester. To ensure maximum bacterial activity and consistent gas production, the digester slurry must be maintained at a steady mesophilic (approx. 37°C) or thermophilic (approx. 55°C) temperature. Our Hot Water Boilers are specifically engineered to provide this constant thermal energy with 100% reliability.
Manufactured in Ahmedabad, these boilers are designed to run on the very gas the plant produces, creating a self-sustaining energy loop that minimizes operational costs.
Key Features for CBG Applications
- Self-Sustaining Energy Loop: Our burners are optimized to fire Raw Biogas directly from the digester or Purified CBG, allowing the plant to use its own fuel for internal heating requirements.
- Precise Temperature Modulation: Equipped with automated mixing valves and VFD-controlled pumps to ensure the water sent to the digester heat exchangers is within ± 1°C of the set point.
- Corrosion-Resistant Internals: Since raw biogas can contain Hydrogen Sulfide (Hâ‚‚S), our boiler tubes and burner heads are available in Stainless Steel (SS 316/304) or treated with protective coatings to prevent acidic corrosion.
- High Thermal Efficiency: Featuring a 3-pass design with integrated condensing technology, achieving efficiencies of up to 95%, ensuring minimal gas consumption for heating.
- Compact Footprint: Designed as a skid-mounted, “Plug & Play” unit, including expansion tanks, circulating pumps, and the gas train, saving significant installation time and space at the CBG site.
- Advanced Safety Systems: Includes double-block-and-bleed valve trains, gas leak detectors, and flame safeguard controls to ensure safe operation near the gas storage area.
Role in the CBG Process
The Hot Water Boiler is essential for:
- Digester Slurry Heating: Maintaining the optimal temperature for methanogenic bacteria to thrive.
- Feedstock Pre-heating: Raising the temperature of incoming organic waste (press mud, cow dung, or agri-waste) before it enters the digester.
- Sanitization/Pasteurization: Heating the digestate to kill pathogens, ensuring the final organic fertilizer meets regulatory standards.
- Tank Insulation Compensation: Offsetting heat loss from the digester walls during winter or in colder climates.
Advantages
- System Integration: We don’t just supply the boiler; we assist in sizing the hot water requirements based on your digester volume and local ambient temperatures.
- Dual Fuel Security: We highly recommend our Dual-Fuel Burners (Biogas + Diesel/Gas) for CBG plants, ensuring that during plant start-up or maintenance, you can still heat the digester using external fuel.
- Local Manufacturing & Support: Being based in Ahmedabad, we offer rapid on-site service and spare parts support for CBG projects across India.
Operating Range
- Capacity : Â 4 lac Kcal/Hr. to 20 lac Kcal/Hr.
- Fuel :Â Wood Log, Biomass Briquette
- Temperature : up-to 90℃ and special design up-to 160℃
Technical Specifications
| Specification | Unit | AQM-10 | AQM-20 | AQM-30 | AQM-40 | AQM-50 | AQM-60 | AQM-80 | AQM-100 | AQM-150 | AQM-200 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| General | |||||||||||
| Maximum heat output | M. Kcal/hr | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.8 | 1.0 | 1.5 | 2.0 |
| Maximum working temperature | °C | 95/150 | 95/150 | 95/150 | 95/150 | 95/150 | 95/150 | 95/150 | 95/150 | 95/150 | 95/150 |
| Hot water Rise temperature | °C | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
| Hot Water Inlet/Outlet | MM | 40 | 50 | 80 | 80 | 100 | 100 | 125 | 150 | 150 | 200 |
| Heating surface area of heater | M² | 8 | 16 | 24 | 32 | 30 | 48 | 64 | 80 | 120 | 160 |
| Mode of Firing | Manual fired | ||||||||||
| Type of Fuel | Fuel | Wood Log, Briquette, Coal | |||||||||
| Boiler Efficiency | |||||||||||
| On Wood Log | % | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 |
| On Briquette | % | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 |
| On Coal | % | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 | 76 +/-2 |
| Fuel Consumption | |||||||||||
| Wood Log (3500) | Kg/hr | 33 | 66 | 99 | 132 | 164 | 197 | 263 | 329 | 493 | 658 |
| Briquette (4000) | Kg/hr | 29 | 58 | 88 | 117 | 146 | 175 | 234 | 292 | 439 | 585 |
| Coal (4500) | Kg/hr | 24 | 49 | 73 | 97 | 122 | 146 | 195 | 244 | 365 | 487 |
| Electrical Load | |||||||||||
| Circulation Water Pump | H.P. | 3.00 | 5.00 | 7.50 | 10.00 | 10.00 | 12.50 | 15.00 | 20.00 | 25.00 | 30.00 |
| ID fan with Motor | H.P. | 2.00 | 3.00 | 3.00 | 5.00 | 7.50 | 7.50 | 10.00 | 10.00 | 15.00 | 20.00 |
| Fd fan with Motor | H.P. | NA | NA | NA | NA | NA | NA | 3.00 | 5.00 | 7.5 | 10.0 |
| Total Electric Load | H.P. | 5.00 | 8.00 | 10.50 | 15.00 | 17.50 | 20.00 | 28.00 | 35.00 | 47.50 | 60.00 |
| NOTE: In view of constant endeavors to improve our products, we reserve the right to alter or change above specifications without prior notice. | |||||||||||
Frequently Asked Questions
Can the boiler run on raw biogas directly from the digester?
Yes. Our burners are specifically designed to handle raw biogas with methane concentrations as low as 50–55%. However, we recommend a moisture separator and a basic H2S scrubber to protect the burner components.
What is the difference between an IBR and Non-IBR hot water boiler for CBG?
Most hot water boilers for CBG are Non-IBR because they operate at atmospheric pressure or below the threshold of 2 kg/cm² and 100°C. This reduces the need for annual IBR inspections and lowers administrative costs.
Can the boiler be automated to maintain digester temperature?
Absolutely. Our boilers use PLC-based controls that receive feedback from sensors inside the digester. The boiler automatically modulates its fire or switches on/off to maintain the exact set point within ± 1°C.
Is a Dual-Fuel burner recommended for CBG plants?
Highly recommended. During the initial plant startup (before gas is produced) or during maintenance, you will need an external fuel like Diesel (HSD) or LPG to heat the digester.
How does H2S (Hydrogen Sulfide) affect the boiler?
H2S can react with moisture to form sulfuric acid, which corrodes standard steel. For CBG plants with high H2S levels, we offer Stainless Steel (SS 304/316) internals and corrosion-resistant coatings.
What kind of water should be used in the boiler?
We recommend a closed-loop system using softened water. This prevents scale formation on the tubes, which can significantly drop heat transfer efficiency and lead to tube failure.
How much space is required for a 1,000,000 Kcal/hr hot water boiler?
Our boilers are compact and often skid-mounted. A typical unit requires approximately 3m x 4m of floor space, including the pump and gas train.
Can the boiler handle "Purified CBG" as well as "Raw Biogas"?
Yes. Our burners are versatile. We simply adjust the air-to-fuel ratio on the burner to accommodate the higher calorific value of purified CBG (90%+ methane).
What is the typical life expectancy of your CBG hot water boilers?
With proper water treatment and routine burner servicing, our boilers are designed for a service life of 15 to 20 years.
What is the thermal efficiency of a biogas-fired hot water boiler?
Our 3-pass wet-back designs achieve up to 88%–92% efficiency. With an optional condensing unit, efficiency can reach 95%.
What safety features are included for gas handling?
Every boiler includes a Gas Train with a Double Block & Bleed valve system, gas leak detectors, pressure switches, and flame sensors (UV/Ionization) to ensure zero accidents.
How do you prevent "Flame Flashback" in biogas boilers?
We use high-quality burners with integrated Flame Arrestors and calibrated air-mixing nozzles that ensure the flame remains stable at the burner head.
Does the boiler require a dedicated operator?
Because our systems are fully automatic, they do not require a full-time operator. A simple daily check of the water levels and gas pressure is sufficient.
Can the boiler be integrated with the plant's SCADA system?
Yes. All our control panels are equipped with RS485/Modbus ports for remote monitoring and control from the main CBG plant control room.
What is the ROI (Return on Investment) for a biogas-fired boiler?
Since you are using a "free" byproduct (biogas) for heating, the savings on diesel or electricity are massive. Most plants see a full ROI on the boiler within 12 to 18 months.
Do you provide a "Plug & Play" skid-mounted solution?
Yes. For CBG plants, we provide the boiler, burner, pumps, expansion tank, and control panel pre-piped on a single MS skid for easy installation.
Does the boiler help in the "Pasteurization" of digestate?
Yes. If your plant requires the digestate to be sanitized (usually at 70°C for 1 hour) before selling it as organic fertilizer, our boiler can easily provide the required temperatures.
How much biogas will the boiler consume per hour?
Consumption depends on the methane percentage. On average, a 100,000 Kcal/hr boiler consumes roughly 18 to 22 cubic meters of raw biogas per hour.
Why choose IndianBoilers.com for a CBG project?
Based in the industrial hub of Ahmedabad, we offer specialized expertise in biogas combustion, robust manufacturing quality, and rapid on-site service support across India.
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