Selection of gasification feedstock – petroleum coke
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This post was last edited by jordan569 on 2013-1-6 23:24. With coal prices soaring, the cost of raw materials for gasification also rises accordingly. Could other raw materials be considered? Such as high-sulfur coal or high-sulfur petroleum coke from abroad? . Note $ # , $ $
I used to use oil for heating, but when that became too expensive I switched to petroleum coke. Later, even petroleum coke became unaffordable, so I switched to coal. Now, coal is also becoming too expensive to use. Hehe, it’s hard to get through each year, yet we manage to get by.
I feel sympathy for the person upstairs, but it seems like the original poster is asking about gasification. I don’t recommend doing that; the processing costs are roughly equal to the sales profits, so it’s not cost-effective... It’s better to burn that stuff; it might have better uses. I hope everyone can provide more information...
Right now, hydrogenation is the main process… Hehe, that substance isn’t just carbon alone.
High-sulfur petroleum coke seems to be a good option; I’m also exploring it. Let’s exchange more ideas!
Burning tar is also a good option; it has a low ash content, a high calorific value, and the technology for vaporizing tar is quite mature. However, as oil prices rise, the grade of tar will also continue to decline, and ensuring a stable supply of raw materials is a problem. If the viscosity of the tar is high, there may be some minor issues with pipeline transportation.
The current price of petroleum coke seems to be 3 to 4 times that of high-quality, high-priced coal.
You are referring to low-sulfur coke. Currently, the market price of high-sulfur petroleum coke in China is around 1,000 yuan per ton (B3b). However, the calorific value of high-sulfur petroleum coke is 1.5 to 2 times that of coal. As China’s refining industry processes an increasing amount of imported high-sulfur crude oil from the Middle East, the properties of petroleum coke have changed significantly. These changes are manifested in higher levels of sulfur (4 wt%) and heavy metals; using such petroleum coke in the steel industry reduces the quality of steel, while its use in the aluminum electrolysis industry lowers production efficiency. In summary, high-sulfur petroleum coke is not suitable as a raw material for industries with high requirements in the chemical and metallurgical sectors, which **reduces its value**. It is estimated that the price of high-sulfur petroleum coke will fall further. This post was last edited by jmwbl on 2008-3-16 03:27]
In the 1970s, based on slag gasification technology, SHELL developed the pressurized pulverized coal gasification technology (SCGP), which enables \"zero emissions\" of pollutants. In 1993, an integrated gasification combined cycle power plant (IGCC) with a capacity to process 2,000 tons of coal per day was built in De Moerle, the Netherlands, and it operated continuously for up to 1 year. Industrial trials were conducted on this device involving the addition of high-sulfur petroleum coke to coal powder, and success was achieved. Essentially, SHELL’s SCGP process involves the partial oxidation of coal or high-sulfur petroleum coke to produce crude syngas. The components of syngas are mainly hydrogen and carbon monoxide, in addition to CO2, H2S, COS, etc. Coarse syngas requires desulfurization using the low-temperature methanol washing process, with a desulfurization efficiency of up to 97%. The hydrogen sulfide that escapes can be converted into sulfur using the Claus process for sale. The desulfurized and cleaned syngas can be used as fuel for gas turbines to drive generators to produce electricity. The exhaust gas temperature from the gas turbine is around 500°C, which can be used to generate steam in a waste heat boiler. The syngas produced by the SCGP process can also be used as a raw material for hydrogen production. The carbon monoxide in syngas undergoes a shift reaction with water vapor in the presence of a catalyst to produce hydrogen and carbon dioxide; this gas is known as shifted gas. The transformed gas, whose hydrogen purity is improved through pressure swing adsorption, can be used in hydrogenation units. The low calorific value off-gas produced by pressure swing adsorption can be used as an auxiliary fuel for boilers. Syngas can first meet the hydrogen production needs, with the excess used to generate electricity in gas turbines. In the overall planning of numerous integrated refining and chemical projects in China, priority is given to constructing combined partial oxidation/power generation/hydrogen production facilities that use high-sulfur petroleum coke as raw material; by utilizing refinery by-products, steam, hydrogen, and electricity are produced to meet the needs of refining hydrogenation and ethylene cracking processes. The IGCC process is complex and difficult to control. Since this process uses pure oxygen, it requires the installation of large-scale air separation oxygen production units, which further increases the construction costs. However, from the perspective of comprehensive resource utilization, the IGCC process is currently a relatively ideal clean utilization method for high-sulfur petroleum coke.