Phase 3 Renewables

Phase 3 Renewables

Biomass Plant Provider

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As an Integrated System Provider, Phase 3 Renewables will supply all the equipment, materials, and associated services for building your biomass energy plant. Phase 3 Renewables provides two biomass processing technology options: Anaerobic Digestion - typically used for wet feedstocks, >50% moisture, Gasification - typically used for dry feedstocks.

The process
Anaerobic digestion is a biochemical process in which micro-organisms break down organic material in an environment with very little or no oxygen. An anaerobic digester is similar to a large stomach - some wastes are easier than others to digest and produce more biogas. Just like a stomach, the digester can become 'upset' if fed the wrong mixture or fed too much or too little. The most robust digesters operate at about 95-105°F, which keeps the micro-organisms productive. As they digest the waste materials, the micro-organisms give off biogas and leave behind a rich, homogenous organic fertilizer with very low odor. Because of the extended processing time at high temperatures, the process also eliminates pathogens, kills weed seeds and fly larve. The composition of the biogas will depend on the specific waste materials used as feedstocks. Digestion of manure generally produces biogas that is 55-65% methane (i.e. natural gas).

Our System design
Phase 3 Renewables designs systems that are tailored for the farm and the farmer. We use well-proven, commercially available components made in the USA with readily available spare parts and service. Our concrete tanks are engineered and built to NRCS and ACI guidelines, including specific considerations for your site such as ground water level, soil load bearing capacity and earthquakes.

The tanks include radiantly heated walls and floors, and are insulated to retain as much heat as possible. Our most popular design is a round tank, but we also offer other styles for unique situations. Agitators are installed either inside or external to the tank, depending on the type of feedstock and total capacity of the tank. Our standard roof design is a double membrane flexible roof, where biogas is stored between the slurry level and the inner membrane and forced air is blown between the inner and outer membrane to maintain a conical shape. In some regions, however, our optional rigid roof may be preferable. The type and quantity of feedstocks will determine the optimum number and size of tanks, and how the tanks should be fed, mixed, and emptied.

In addition to the digestion tanks, Phase 3 Renewables will design the entire integrated system, including controls and equipment for getting the wastes into the digester, getting the digestate out of the tanks for further processing, and getting the biogas to the energy production equipment (boiler, generator, upgrading system) or flare.

Gasification is the best choice for drier feedstocks, and those with high levels of woody biomass or scrap materials. Unlike incineration, the biomass is not burned and there is no flame. Instead, the biomass is 'roasted' at very high temperatures and with very little oxygen to drive off the energy‐rich gases while leaving nearly all compounds which could form toxic air contaminants if vaporized in the solid ash.

After extensively researching worldwide, Phase 3 Renewables is proud to offer a proprietary system manufactured by Heat Transfer International (HTI). The custom‐designed process equipment converts solid and semi solid biomass, such as turkey litter, horse manure, spoiled hay or woody wastes into a combustible syngas that can be used to power generators, dyers, heaters and cooling equipment. A choice of three proprietary feeders allows a wide range of mixed waste streams to be processed without sorting. The low temperature, starved‐air gasifier transports the waste through an air‐locked bottom fed system supplied with counter flow augers that prevent bridging and maintain a seal between the gasification chamber and the feed hopper. The waste is forced up through a center cone and a percentage of stoichiometric air is introduced into the waste pile through tuyeres. The syngas is sent to a secondary staged oxidizing chamber, which destroys all hydrocarbons and greatly reduces NOx formation. The hot combustion air from the oxidizing chamber can then be sent to a water or fire tube boiler, which can in turn be combined with an evaporative cooler or air‐to‐air heat exchanger. Alternatively, a proprietary ceramic heat exchanger can be used to provide hot dynamic air to an air turbine generator for electrical production. This system is more cost effective and energy efficient than traditional steam turbines.

The energy potential in your biomass can be determined with a simple test. Some typical values for common wastes are shown below, expressed on a MOISTURE‐FREE BASIS:

  1. Wood – 8,500 BTU
  2. Manures – 9,000 BTU
  3. Corn stover – 8,300 BTU
  4. WDG from breweries and ethanol plants – 10,200 BTU
  5. Energy crops – 9,000 BTU

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