Help: Gasification of lignite!

Dry powder pressurized gasification – can it be done at both the North China Institute and the Northwest Institute?

For lignite, the Lurgi gasification technology is the best choice, and the Second Research Institute for Chemical Engineering can carry out the design. It is not suitable to use dry powder gasification for lignite on the 2nd floor. Last edited by purpleghj on 2007-12-11 09:57.]

Thank you very much for your reply. Given that the management has scheduled a survey in the near future, I hope everyone can specify the actual manufacturers!

Currently, Datang International uses brown coal gasification, and the Fifth Ring Design Institute is capable of carrying out the design work.

The MTP project of Datang International uses local lignite from Inner Mongolia and Shell’s powder gasification technology; Wuhan Wuhuan Engineering Company (formerly the Fourth Research Institute of Chemistry) is responsible for the engineering design of the gasification phase. There are a total of 3 gasification furnaces, with each furnace equipped with 6 coal burners; the coal feeding rate per furnace amounts to 2,700 tons per day (based on the coal fed into the furnace).

When lignite is used as the raw material, the Shell gasification technology is recommended. Many coal-to-methanol plants under construction currently employ this technology; when methanol is produced using this process, the loads associated with conversion and decarburization are relatively high. Another applicable option is the high-temperature Winkler gasification technology, for which no large-scale commercial installations have been reported. Circulating fluidized bed technology still has certain problems. Overall, the shell is a more suitable choice.

After going through a series of evaluations and consultations, I think the Endu furnace is also a fairly good choice! After years of development, the Ende furnace is now widely used in China~~~ There are successful applications in regions such as Jilin, Yunnan, and Tongliao in Inner Mongolia!

It is entirely feasible to use Ender furnaces for lignite; this technology has been in use abroad for decades, and several companies in China have experience operating such furnaces. The problem, I think, lies in dust treatment. Do you have the unique natural conditions of Jilin Changshan Fertilizer Factory there? The ash pyrolysis fluidized bed technology developed by Shaanxi Qinjin Gasification Engineering Company could also be considered; it has been in use at the Tianjin Alkali Plant for two years now, with remarkable results!

Go and check out Tongliao Meihua Monosodium Glutamate – it seems to have two Endu furnaces with a capacity of 2,000 cubic meters each

A fluidized bed design should be adopted; Tianchen Design Institute also offers a good option

Dry powder gasification technology is recommended; if funds are abundant, SHELL can be chosen, while if funds are limited, a space furnace can be selected! (Both have no restrictions on coal types: handshake)

The two 40,000 m3 Endo gasifiers for lignite gasification installed in our company are about to go into operation!

The 2 Endu furnaces on the upper floor have been put into operation, and I have a few questions: First, how does your company handle dust removal using cyclones in its Endu furnaces? Is there still a problem of high dust content in the gas produced afterward? Second, what is your company’s approach to coal preparation for these Endu furnaces? It is said that there are defects in the Endu technology in this regard. Third, how is slag disposal handled? Could you provide a detailed answer?

Shell furnaces are better, but they also have their problems. At present, the performance of Shell furnaces in China is not very good; I think End furnace is more suitable

1. The dust removal system for our company’s Ende furnaces consists of a counterflow cyclone dust collector for initial dust removal, followed by a high-temperature cyclone dust collector to remove further dust. The gas then enters a waste boiler to recover the sensible heat contained in the crude gas; after that, it passes through a low-temperature cyclone dust collector for additional dust removal. Finally, it goes through a washing tower and a Venturi tube for further dust removal, ensuring that the dust content upon reaching the main gas pipeline is less than 60 mg/m3. 2. For coal preparation, the process involves first crushing it, then drying it, and finally screening it. Coal of the appropriate particle size is fed into the Ender furnace, while coal that is too fine is used as fuel in our company’s pulverized coal boilers. 3. Slag includes furnace ash and carryovers. The furnace ash is removed; the materials carried out enter the gas generation circulating water system, and after solidification, they are taken away as well. Usage of slag: Our company will build its own gray brick factory to produce gray bricks. I’m not sure what else you would like to know; if you’d like detailed information, please contact me separately. Contact number: 13019527586

Xi’an Thermal Power Institute’s two-stage dry coal powder pressurized gasification technology: victory – The gasifier features a water-cooled furnace chamber and liquid slag discharge. During operation, pulverized coal, water vapor, and oxygen are injected into the lower furnace, while a small amount of pulverized coal and water vapor are injected into the upper furnace. Utilize the sensible heat of the gas in the lower furnace chamber to drive the pyrolysis and gasification reactions of the coal in the upper furnace chamber, thereby improving the overall cold gas efficiency ； It also significantly reduces the temperature of the hot gas, lowering the gas at the furnace outlet below the ash melting point; this eliminates the need for a cold gas quenching process. This gasification furnace has been granted a **patent**. There are currently no industrial plants operating using this technology, but a 2,000 tons/day two-stage dry coal powder pressurized gasification furnace (waste boiler system) has been applied in Huaneng Group’s “Green Coal Power” project, with completion expected in 2009 ； A 1,000-ton/day two-stage dry coal powder pressurized gasification furnace (quenching process) has been applied to the 300,000-ton/year methanol production project of Inner Mongolia Shilin Chemical Co., Ltd., with commissioning expected in 2008. :victory:

Personally, I think the poster’s leader is quite forward-thinking. Lignite gasification is currently considered to be one of the most advanced technologies. Among existing gasification methods, the fluidized bed is undoubtedly the most sophisticated technique; however, there are issues when using fluidized beds for lignite. It is difficult to achieve the necessary concentration in a wet fluidized bed. Whether it is possible to use slurry after pre-coking depends on the wax sealing effect resulting from coking. If the capillary pores cannot be properly sealed by wax, wet gasification cannot take place. In dry gasification, the high water content in lignite results in very high drying costs, making the process difficult to operate. If your company has a strong financial capacity similar to that of Shenhua and Datang, you can consider going with dry gasification ； If your skills are average, you can try the End Furnace.

What was said upstairs is correct; you can give a space oven a try: lol

Lignite: drying and modification, coal blending for pulp production; the concentration of lignite pulp is low: around 56%； The ash content is high. However, by modifying the coal blend and using specialized additives, it is possible to increase it by 3–5 percentage points. According to years of research conducted by the Water-Coal Center of the China Coal Research Institute, it is entirely possible to achieve gasification at the most cost-effective ratio.:victory: