What does the level of methane have to do with it?

The methane content in the gas is an important indicator for determining the furnace temperature of the gasifier. Especially in the early stages of startup, its accuracy and reliability are higher than the CO2 content. Then its influencing factors are the oxygen-to-coal ratio and the amount of steam entering the gasification furnace. It can be analyzed from the reactions that occur in the gasifier.

First of all, it has something to do with the coal type, and then it has something to do with the operating temperature. The rest is not familiar.

1. Type of coal. Coal with a low degree of coalification has a high volatile content, and the carbonization product contains methane. 2. Operating temperature. Low temperature has a high methane content. 3. Pressure also has a slight impact on methane content. High pressure is conducive to the generation of methane. 4. The gasification furnace adopts technology. The methane content of Lurgi pressurized gasification technology is much higher than that of Shell, Texaco, etc.

In daily judgment, temperature is a major indicator that affects its content.

For the same furnace and coal type, it is mainly related to the furnace temperature. If the furnace temperature is high, the methane content will be low. If the furnace temperature is low, the methane content will be high.

Generally, what is the methane content of this kind of gas? It is always higher than coking. Can anyone provide data? Is it more carbon or hydrogen? Does the remaining gas have to go through methanation reaction? I have a project and want to do this, but there is too little information: Q

Mainly the technology used, operating temperature and operating pressure. Other effects are slightly less.

For different gasification technologies, low-temperature gasification has a higher methane content than high-temperature gasification.； Lurgi gasification methane content increases with increasing pressure ； High ash content in coal can also lead to elevated methane levels.

This mainly depends on the way of gasification.

First of all, it is related to the selected coal gasification technology. Lucci is the highest, followed by coal-water slurry, and dry pulverized coal entrained bed technology is lower.； Secondly, it is related to the type of coal, the degree of deterioration of the coal, the volatile content of the coal, etc. ； Third, for the coal water slurry gasification process: 1. Gasifier operating temperature. If the operating temperature is low, the methane content will increase. ； 2. Gasifier load. When the load is low, due to the low burner pressure difference and poor atomization effect, the coal-water slurry that has not participated in the gasification reaction will crack to generate methane in the anoxic zone. ； 3. Whether the burner is good or bad depends on the pressure difference of the burner. If the pressure difference of the burner is too low, please refer to the above 2. ； 4. The coal slurry concentration is too low, and the methane yield will be high under the same furnace temperature and the same effective gas. This post was last edited by Konggu Jinsong on 2009-4-18 08:43 ]

1# zyy7967 This has a lot to do with the selection of gasification agent, the control of operating parameters and the selection of equipment. The methanation reaction is beneficial to low temperature and high pressure.

It is related to coal quality, degree of combustion, oxygen content and temperature.

Furnace temperature, oxygen-to-coal ratio, coal slurry concentration, coal quality... may all affect the level of methane! High furnace temperature: Low effective gas composition of methane and low oxygen coal ratio: Coal slurry concentration has similar properties to furnace temperature: The thicker the coal slurry, the higher the methane content and the quality of the coal.: This is more complicated and requires detailed consideration and analysis based on the properties of coal!

This post was last edited by Tianya Wandering on 2009-5-6 21:18. The level of CH4 in the crude gas of entrained bed coal gasification is about 50~500PPM. The level of CH4 in the crude gas of dry entrained bed coal gasification is 30~200PPM. Of course, the crude coal gas contains more hydrogen in the crude syngas of the carbon polyhydrocarbon steam reforming process.

Reply to the 7th floor: The methane content of coal water slurry is about 1000PPM.

There are mainly two reasons: 1. The composition of raw coal. The gas produced from raw coal with high volatile content will have higher methane. 2. Gasification temperature. If the gasification temperature is low, the methane content in the gas will be higher. Pressure has a certain impact, but not too much.

Supplement: Several reasons for the generation of methane during the gasification process 1. Carbonization of coal 2. Hydrogenation of coal 3. Methanation reaction of CO CO2 and water

Mainly related to coal quality, gasifier pressure (the greater the pressure, the higher the methane content), and the gasifier temperature (the higher the temperature, the lower the methane content)

The methane number is an important indicator for controlling the furnace temperature. Generally speaking, the gasification furnace can be controlled from the gas composition, coil cooling water density, furnace wall temperature, coil drum pressure and slag composition to determine the furnace temperature. However, due to changes in coal types and the thickness of the slag layer on the furnace wall Affected by factors such as temperature, the above judgment basis may sometimes be inaccurate, but the methane value is a relatively accurate basis for judging the furnace temperature. Therefore, the changes in the furnace temperature can be judged based on the changing trend of the methane value. If methane is high, the furnace temperature will be low, and if methane is low, the furnace temperature will be high.

The methane content of the syngas is inversely proportional to the gasifier temperature. The methane content directly reflects the temperature of the gasifier. The lower the methane content of the syngas, the higher the furnace temperature. The methane content of the HT-L pulverized coal pressurized gasification syngas is around 100ppm.