Bio-Gas Drying, Coolers & Blowers
Bio-gas is saturated with moisture when it leaves the digester or covered lagoon. A typical digester outlet has a vapor content of 1 to 3.5 ounces per 35 cubic feet, or approximately 27,000 gallons per year. Of course these figures will vary, depending on ambient temperatures. In order to avoid major damage to downstream equipment, both moisture and sediments need to be removed from the bio-gas.
Water traps are designed to remove liquids and solids from the bio-gas and are installed immediately downstream from each digester to remove the large volume of condensed water. They are also installed upstream from the energy recovery plant.
First-stage removal is accomplished by a combination of centrifugal force and a sharp drop in velocity as the gas enters the trap. Second-stage removal takes place in a stainless steel pot with media that separates smaller particles from the bio-gas flow.
Gas De-Humidification with Bio-Gas Drying Systems
Water (high moisture content) is one of the most destructive elements to engine lubricants. It accelerates base oil oxidation and interferes with oil film protection. High moisture content can also produce carbonic acid which rapidly reduces the alkalinity (base number) of the lubricant, resulting in an unprotected, corrosive environment.
Installing a packaged system to remove the moisture from the bio-gas will avoid downtime and costly, unplanned, major repairs. Bio-gas drying systems also optimize the internal combustion process by lowering fuel consumption, increasing engine efficiency.
Bio-Gas Gas Cooling and Chilling Systems
Bio-gas coolers and chillers are custom designed to meet the demands of each site or project. By way of a refrigeration cycle, mechanical chillers remove heat from a glycol loop. This liquid is then circulated through shell and tube bundles designed for bio-gas cooling. We design and manufacture bio-gas systems that typically consist of a gas-to-cold-glycol heat exchanger, integrated with an industrial mechanical chiller. The packaged equipment is weatherproof. Also, all wetted parts in contact with the bio-gas are manufactured from stainless steel.
The bio-gas enters the economizer where it is pre-cooled by the colder outlet bio-gas. It then passes through the demister/separator, where the temperature is further reduced in order to allow condensation to form and be removed. A second heat exchanger uses a counter-flowing glycol solution to achieve a predetermined dew point and remove any residual condensate that remains in the bio-gas. The relative humidity of the outlet bio-gas is set by reheating through the economizer (gas/gas heat exchanger) which uses the inlet bio-gas to heat the cooled exit bio-gas.
Every bio-gas plant needs to move bio-gas from its source to the where the engine (or even a boiler) can utilize it. Gas blower / booster systems facilitate optimal gas supply and engine operation. Further, the blower not only stabilizes gas pressures but also helps drop moisture by compressing the gas. Gas blower systems can either be issued as a free-standing product, or as an overall turnkey package within the CHP scope of supply.
Here at Martin Energy Group, we offer bio-gas blowers of various brands and executions, but recommend only high quality and deliver only dependability!