Introduction[ edit ] Circulating fluidized bed is a relatively new technology with the ability to achieve lower emission of pollutants. Extensive research has been conducted on this technology for the past 10 years because pollution in the world is getting more serious by the day and clean practice will be very crucial for the sustainability of the earth.
Background As a technology, gasification is more than a hundred years old, and in terms of small scale units it possibly peaked before and after WWII. This was due to the shortages experienced with liquid petroleum but once oil became available the gasification units disappeared.
Prior togas generator units were a familiar, but not extensively utilized, technology. However, petroleum shortages during World War II led to widespread gas generator applications in the transportation industries of Western Europe. All over Europe, Asia, and Australia, millions of gas generators were in operation between and Torrefaction, Pyrolysis and Gasification These terms often appear to be used interchangeably; however there are differences in the way biomass is thermochemically converted under each process and also in the end product.
It is often used to convert solid biomass to a liquid fuel. Federal Emergency Management Agency FEM Gasifier Plans The use of the gasifier technology has ebbed and flowed, but with the steady rise of oil price and to a less extent environmental concerns the technology is once again being researched and used.
Gasifiers in the medium to large scale to generate electricity have wider application around the world. Renewable dry biomass is extremely abundant, but only a highly selective small fraction is utilised for energy. Available technology for gasification could utilize a much wider variety and greater quantities of the biomass and provide significant energy while alleviating several pressing environmental concerns.
Principles of Gasification All internal combustion engines run on vapor, not liquid. The liquid fuels use by petrol engines are vaporized before they enter the combustion chamber.
The purpose of a gasifier is to transform solid fuels into a gas and to keep the gas free of harmful constituents. There are many solid biomass fuels suitable for gasification from wood and paper to peat, lignite, coal, rice husks, sawdust etc. The aim of gasification is the almost complete transformation of this material into a gaseous form so that only the ashes and inert materials remain.
Initially, in the first step called pyrolysis, the organic matter is decomposed by heat into gaseous and liquid volatile materials and char which is mainly a non-volatile material, containing high carbon content.
The producer gas leaves the reactor with pollutants and therefore, requires cleaning to satisfy requirements for engines. Mixed with air, the cleaned producer gas can be used in gas turbines in large scale plantsgas engines, gasoline or diesel engines Salam, Kumar and Siriwardhana, Types of Gasifiers There are about five major classifications of gasifier systems: More information on each type can be seen by following the links.
What separates these types different is how and where the biomass sits in the reactor vessel, the direction of both air flow and the feedstock.
Generally, fixed bed gasifiers are a lot simpler, less expensive, and produce lower heat content, for example producer gas.
Fluidized Bed. At the bottom of the boiler furnace there is a bed of inert material. Bed is where the coal or fuel spreads. Air supply is from under the bed at high pressure. Feb 02, · Mass transfer from moist air to silica gel particles in a fluidized bed reactor. Introduction. Circulating fluidized bed is a relatively new technology with the ability to achieve lower emission of pollutants. Extensive research has been conducted on this technology for the past 10 years because pollution in the world is getting more serious by the day and clean practice will be very crucial for the sustainability of the earth.
Fluidized bed gasifiers are more complicated, more expensive, and produce a gas with a higher heating value. Different Types of Gasifiers Source: Salam, Kumar and Siriwardhana, Gasifier Tar This is mentioned as gasifiers produce tar and it must be dealt with if the gas is going to be used to run and engine or gas turbine.
Tar is not so problematic if the gas is burned directly in a boiler to produce heat. The cleaning of gas and removal of tar are still one of the major technical issues associated with using gasifiers.Fluidized Bed Combustion is the ignition of a solid fuel under conditions mentioned above.
At Thermodyne, Boiler Manufacture in India, We design and manufacture Boilers with. Bubbling Fluidized Bed Combustion (BFBC) Circulating Fluidized Bed Combustion (CFBC). Circulating Fluidized-Bed (IR-CFB) Boilers Drawing upon our extensive technical expertise and operating experience, B&W developed the Internal Recirculation Circulating Fluidized-Bed (IR-CFB) boiler which is the technology of choice for power plant owners seeking economy, reliability and flexibility.
Khanom (KEGCO) CCGT Power Plant Thailand is located at Near Thong Nian, Nakon Sri Thammarat, Thailand. Location coordinates are: Latitude= , Longitude= This infrastructure is of TYPE Gas Power Plant with a design capacity of MWe. It has 7 unit(s).
The first unit was commissioned in and the last in It is operated by Khanom Electricity Generating Company Ltd (KEGCO). 4 Circulating Fluidized Bed (CFB) Boilers Waste Heat Boilers Heat Recovery Steam Generators Bubbling Fluidized Bed (BFB) Boilers PC Boilers. Selective Non-Catalytic Reduction: Overview William H.
Sun, Ph.D. Fuel Tech, Inc. WPCA/Duke NOx Seminar Hosted by Duke Energy Charlotte, NC June 7, 6. FBC Boilers Fixing, bubbling and fast fluidized beds As the velocity of a gas flowing through a bed of particles increases, a value is reaches when the bed.