What is entrained flow gasifier?
In entrained-flow gasifiers, fine coal feed and the oxidant (air or oxygen) and/or steam are fed co-currently to the gasifier. This results in the oxidant and steam surrounding or entraining the coal particles as they flow through the gasifier in a dense cloud.
What are the two types of entrained flow gasifier?
Entrained-flow gasifiers are of two types, top-fed and side-fed depending on how and where the fuel is injected into the reactor. Section 8.4 discusses some of these types. In all of these designs, oxygen enters the reactor and reacts rapidly with the volatiles and char in exothermic reactions.
What is entrained flow reactor?
The entrained flow reactor is used for fundamental combustion investigations of solid fuels under exactly defined conditions. This is reached through electric heating elements, which can heat the combustion tube to up to 1600 °C.
What is fluidized bed gasifier?
Fluidized-bed gasifiers suspend feedstock particles in an oxygen-rich gas so the resulting bed within the gasifier acts as a fluid. These gasifiers employ back-mixing, and efficiently mix feed coal particles with coal particles already undergoing gasification.
What gasification means?
Gasification is a process that converts organic or fossil-based carbonaceous materials at high temperatures (>700°C), without combustion, with a controlled amount of oxygen and/or steam into carbon monoxide, hydrogen, and carbon dioxide.
How many types of gasifiers are there?
There are three types of fixed bed gasifiers: updraft (counter-current), downdraft (co-current), and cross draft gasifier.
How does an updraft gasifier work?
In updraft gasifiers, fuel moves downward and gas upward. In co-current gasifiers, the fuel and gas move in the same direction, usually downward (downdraft gasifiers), but the movement can also be upward.
What is gasifier and its types?
Gasifier equipment is generally classified as upward draft, downward draft and cross draft gasifiers, based on the direction of air/oxygen flow in the equipment. It should be noted that there are types of gasifier equipment which are different from types of gasification processes.
How do gasifiers work?
How are gasifiers made?
Gasification is a thermochemical process that involves heating the waste plastic at 700–1100°C with a controlled amount of oxygen, air, oxygen-enriched air, and/or steam to produce industrial gas mixtures called “synthesis gas,” or syngas.
What is difference between updraft and downdraft gasifier?
In downdraft gasifiers, both fuel and the gas move downward. In updraft gasifiers, fuel moves downward and gas upward. In co-current gasifiers, the fuel and gas move in the same direction, usually downward (downdraft gasifiers), but the movement can also be upward.
How many types of gasifier are there?
What are the application of gasifier?
Generally, they are used in sawmills, wood cutting industries, and in generating power. They can be used for supplying power to the remote areas. The manufacturing, installations can be a bit costly as it requires high equipment and supply of fuels and such matter to the gasifier.
What is downdraft gasifier?
A downdraft gasifier is the typical configuration used for bioenergy production. This well-established technology allows the production of syngas with low tar, due to the syngas passes through the combustion zone at high temperature and the subsequent dimensioning which in turn leads to the thermal cracking of tars.
What are types of gasifier?
2.3 Types of gasifiers
- 1 Updraught or counter current gasifier. The oldest and simplest type of gasifier is the counter current or updraught gasifier shown schematically in Fig.
- 2 Downdraught or co-current gasifiers.
- Cross-draught gasifier.
- Fluidized bed gasifier.
- 5 Other types of gasifiers.
What is reduction zone in gasifier?
Reduction zone. This process commences as soon as the oxygen of the gasifying media has been used up. The Carbon Dioxide and water vapour entrained by the gas flow are almost completely reduced to CO and H2.