Compressed Bio Gas

Compressed Bio Gas (CBG)

India ranks as the world’s second-largest sugar cane producer, with Uttar Pradesh, Maharashtra, and Karnataka emerging as leading states in this cultivation. Maharashtra alone harbors around 202 sugar factories. Given India’s strong agricultural foundation, the country possesses significant potential for harnessing agricultural byproducts and waste to create energy.

Biomethanation, a technology encompassing economic, social, and environmental benefits, holds the potential to profoundly benefit India’s sugar industry and farmers. This process involves the anaerobic decomposition of organic materials, resulting in the production of biogas. This biogas proves advantageous due to its applicability as a local fuel source for vehicles or as a means to generate both electrical and thermal energy.

Biogas generation

The reactors employed for this purpose adhere to a Continuous Stirred Tank Reactor (CSTR) configuration, characterized by their operational dynamics. These reactors function optimally under mesophilic temperatures, which are moderate and conducive to the efficient biogas generation process. This strategic alignment enhances the overall efficiency and performance of the system, leading to the successful conversion of organic waste into valuable biogas while maintaining operational robustness.

Biogas cleaning process

This cutting-edge Indian technology elevates biogas purity beyond 96% methane gas, adhering to government standards. The weather-resistant absorber columns efficiently eliminate H2S and CO2. The interconnected upgradation sections maintain uniform gas pressure via a central gas holder, backed by safety valves and sensors tied to a PLC for comprehensive safety.

The process begins with raw biogas from digesters treating distillery waste and press mud. An innovative biochemical method, including an aerobic reactor, absorber, and sulphur recovery unit, converts H2S-containing gases to elemental sulphur.

The resulting biogas, with reduced H2S at 200 ppm, undergoes further refining through a low-pressure compressor unit. Real-time monitoring is facilitated by online H2S analyzers, enhancing control, and accuracy.

CO₂ removal process

CO2 removal from biogas employs a packed column with soft water as solvent under 7.5 kg/cm² pressure, reducing CO2 to <4%. A closed-loop system regenerates soft water, minimizing chilling costs. Moisture removal follows via a Dryer Unit. Dry methane, free of H2S and CO2, is achieved through a two-vessel molecular sieve dryer. Biogas then enters a 6-7 kg/cm² buffer vessel with pressure control and PRV for closed-loop gas recycling, before advancing to the high-pressure compressor.