BIOWASTE GASIFICATION POWER PLANTS

Gasification of wood into syngas is an old technology and was used extensively during the war and in the early days of automobiles, however technologies and equipment have been vastly improved since then.

The 3MW biowaste gasification plant we install will generate approximately $493,000 profit each year and create 18 new jobs in Kake. Our electricity operations will trade as Kwaan Power & Energy LLC. Kwaan is Tlingit for Our.

Gasification is a process that converts carbonaceous materials, such as biomass, into carbon monoxide and hydrogen by reacting the raw material at high temperatures with a controlled amount of oxygen and/or steam. The resulting gas mixture is called synthesis gas or syngas and is itself a fuel. Gasification is a very efficient method for extracting energy from many different types of organic materials.

The advantage of gasification is that using the syngas is potentially more efficient than direct combustion of the original fuel because it can be combusted at higher temperatures or even in fuel cells, so that the thermodynamic upper limit to the efficiency defined by Carnot's rule is higher or invalid. Syngas may be burned directly in internal combustion engines. Gasification can also begin with materials that are not otherwise useful fuels, such as biomass or organic waste. In addition, the high-temperature combustion refines out corrosive ash elements such as chloride and potassium, allowing clean gas production from otherwise problematic fuels.

Almost any type of organic material can be used as the raw material for gasification, such as wood, biomass, such as rice husks, corn stalks, wheat straw, cotton stalks or even plastic waste. Thus, gasification may be an important technology for renewable energy. In particular biomass gasification can be carbon neutral.

Gasification relies on chemical processes at elevated temperatures >700C, which distinguishes it from biological processes such as anaerobic digestion that produce biogas.

Electricity generation

The syngas is scrubbed and then fed to slow rotating internal combustion engines coupled to alternators (gensets) these in turn generate low cost green electricity. Biowaste gasification power plants are ideally suited to the production of small quantities of electricity from a few hundred KW up to 6MW or more.

The waste heat from the gasifier and gensets can be used to dry the biomass for the gasifier, biomass for wood pelleting and the cooling water can be circulated through buildings or green houses to provide heating or though anaerobic digesters to maintain a constants suitable temperature that will facility fermentation.

                 

Back