Gasification methods
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Does anyone know of a gasification method that does not require steam? Thank you
The main purpose of gasification is to obtain hydrogen, which primarily comes from water (water vapor). Gas produced by gasification without steam is known as air gas, and it has no practical industrial value. I wonder why the original poster asked such a question? This post was last edited by qin*ke on 2008-1-20 00:40]
There are also those that use carbon dioxide and oxygen as gasifying agents, mainly to produce carbon monoxide from coke.
A friend asked me for advice. He needs to use gas as a heat source; he wants to know how much gas is produced from one kilogram of coal, and how much heat can be obtained from it. I replied that one kilogram of coal produces about 3 cubic meters of gas, while consuming 0.3 kilograms of steam. A friend said there is a method that doesn’t require steam, but they don’t know exactly what it is, so I’m asking everyone if there’s any way of vaporization that doesn’t need steam
It depends on what products and processes are involved. Common substances like methanol and synthetic ammonia require hydrogen as a component; water is generally needed as well. Powder coal gasification technology requires steam, whereas water-coal slurry gasification technology does not need steam
Pressurized gasification of water-coal slurry does not require steam, but water is needed to create the coal slurry; in the end, it turns into steam inside the gasifier as well. The principle is more or less the same
Coal burns completely in air or pure oxygen to produce carbon dioxide, yielding the highest calorific value, and this can occur at atmospheric pressure. Just like a coal stove at home, if you add a bellows, its heat generation from combustion will be much greater. If you don’t intend to produce carbon monoxide and hydrogen but only use it as a heat source, is it necessary to add steam? Is it necessary to gasify under pressure? Moreover, the heat value of the carbon monoxide produced is not high either!
The main purpose of gasification is to obtain CO and H2. Since the hydrogen content in coal is relatively low, some steam or water must be added during gasification to decompose it into hydrogen. Although dry gasification does not require the addition of water, it still needs some steam; in addition to providing hydrogen, this steam also helps to regulate the furnace temperature. Syngas is primarily produced to generate H2, that is, by converting the carbon in coal into H. The subsequent conversion process is used to transform CO into H2, with full conversion and partial conversion being the two types of such processes.
Isn’t it **advocated now to gasify coal underground? Underground gasification is primarily applied to abandoned coal mines; it involves injecting a gasifying agent (such as air or oxygen-enriched air) directly into the coal seams beneath the mine through specific boreholes, thereby converting the coal into gas underground, which is then extracted to the surface through another set of boreholes for use.
It seems that the only gasification furnace that does not require steam at present is the space furnace; since no steam is used, its gasification temperature can reach 1900°C, and the raw coal can be sourced locally.
It’s a strange furnace; what is its main purpose? Can it produce enough H2 and CO?
I’m sorry, but I’d like to point out a mistake: the carbon in coal does not convert into hydrogen; it only converts into CO or CO2. My humble opinion
Reference post, maybe useful: http://bbs.hcbbs.com/viewthread.php?tid=234818&highlight=%C3%BA%C6%F8%BB%AF%B7%BD%B7%A8
Using coke as the raw material and carbon dioxide as the vaporizing agent to produce high-concentration carbon monoxide (with a concentration of 70–75%), there is no need to use steam as a vaporizing agent; I have seen such furnaces at the acetic acid plant in Jiangsu Supor. It seems to have been designed by the Shanghai Chemical Engineering Design Institute. Gas stoves manufactured by Shandong Botao Equipment Factory. Would you like to ask a question?
Common substances such as methanol and synthetic ammonia require hydrogen as a component; water is generally needed as well. Powder coal gasification technology requires steam, whereas water-coal slurry gasification technology does not need steam
By using carbon dioxide as a vaporizing agent to produce high-concentration carbon monoxide (with a concentration of 70–75%), there is no need to use steam as a vaporizing agent; I have seen such furnaces at the acetic acid plant in Jiangsu Supor. It seems to have been designed by the Shanghai Chemical Engineering Design Institute