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 not applicable. Syngas may be burned directly in gas engines, used to produce methanol and hydrogen, or converted via the Fischer–Tropsch process into synthetic fuel. Gasification can also begin with material which would otherwise have been disposed of such as biodegradable waste. In addition, the high-temperature process refines out corrosive ash elements such as chloride and potassium, allowing clean gas production from otherwise problematic fuels. Gasification of fossil fuels is currently widely used on industrial scales to generate electricity
2016年7月27日星期三
Introduction of Gasification
Gasification is a process that converts organic or fossil based carbonaceous materials into carbon monoxide, hydrogen and carbon dioxide. This is achieved by reacting the material
at high temperatures (>700 °C), without combustion, with a controlled amount
of oxygen and/or steam. The resulting gas mixture is called syngas (from synthesis gas or synthetic gas) or producer gas and is itself a fuel. The power derived from
gasification and combustion of the resultant gas is considered to be a source
of renewable energy if the gasified compounds were obtained from
biomass.
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 not applicable. Syngas may be burned directly in gas engines, used to produce methanol and hydrogen, or converted via the Fischer–Tropsch process into synthetic fuel. Gasification can also begin with material which would otherwise have been disposed of such as biodegradable waste. In addition, the high-temperature process refines out corrosive ash elements such as chloride and potassium, allowing clean gas production from otherwise problematic fuels. Gasification of fossil fuels is currently widely used on industrial scales to generate electricity
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 not applicable. Syngas may be burned directly in gas engines, used to produce methanol and hydrogen, or converted via the Fischer–Tropsch process into synthetic fuel. Gasification can also begin with material which would otherwise have been disposed of such as biodegradable waste. In addition, the high-temperature process refines out corrosive ash elements such as chloride and potassium, allowing clean gas production from otherwise problematic fuels. Gasification of fossil fuels is currently widely used on industrial scales to generate electricity
Syngas analyzer apply in gasifier
(1) Coal gasifier
The coal gasifier can be divided into four modes by the
movement pattern of the coal in the gasifier: fixed bed (moving bed), fluidized
bed, entrained bed and molten bed. While it can be summarized to atmospheric and
high pressure styles according to the gasification operating pressure. Based on
the feeding method, the coal gasifier contains solid and liquid feeding
manners. In the light of the residue-discharge mode, it can be classified into
solid and liquid patterns. In industry, the typical coal gasifiers include UGI
gas furnace, Lurgi gas furnace, Winkler gas furnace, Texaco gas furnace and Dow
Chemical gas furnace. Depending on various technology needs, the coal gasifiers
provide air gas, mixed gas, water gas and semi-water gas.
In the coal gasifier device, the volume fractions of CO,CO2, CH4 and H2 are important parameters of process control, and the ability to
accurately measure these variables is considered to be one of the most important
indicators of the energy efficiency of the entire unit. First, the gas
composition analysis can be used to determine the reaction state in the
furnace, for example, the content of O2 is a critical control parameter in the
production of semi-water gas. Additionally, it is necessary that the
concentrations of CO and H2 are confirmed to be under the explosive limit
before ignition, preventing any explosion. As we know, it is necessary to carry
out N2 exchange until the feeding operation, but stilly, the O2 content in the
furnace must be determined because the feeding coal slurry enters firstly, and
it may reacts with O2 causing an explosion.
2016年7月19日星期二
Special designed gas conditioning system for biomass/syngas applications
A critical issue with biomass and coal gasification processes is the
presence of tar and dust in the process gas. These are usually removed by the
client but it can occur that some remaining quantities need to be eliminated at
the level of the gas analysis system.
For these applications we have designed a special gas conditioning system consisting in dust and soot/tars pre-filtration unit with bubbler, filters, water
collectors, peristaltic pumps, manual bubbler water filling/emptying system,
etc.
The definitive design will be possible after complete
engineering study after order receipt.
Features of syngas analysers
·Proprietary thermal conductivity detector for H2
·Industrial galvanic fuel cell for O2 (0-25%)
·Calculation and display of the BTU index (gas calorific
value, only with SYNGAS analysers)
·LCD display (240 x 128) with backlit function
·Keyboard interface for configuration and calibration
·1x 4-20mA analogue output per measuring channel
·2 alarm relays per measuring channel, with 2 freely
configurable gas alarm levels
·RS232 serial COM port (for real time data download to
external PC or laptop as text file, software included)
·Programmable auto-zero function, including internal
pump, relay and solenoid valve
·Stainless steel connectors for gas inlet/outlet and zero air
inlet ports
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