Coal water slurry gasification and water wall

Texaco or GE? It seems to be the same. First of all, GE has been developing for more than 10 years, mainly refractory brick lining, which is already very mature. If the water-cooled wall is developed again, the investment will not be small, and there will be certain risks, and the temperature of GE seems to be insufficient if water-cooling is used. Also, the use of shell water-cooled wall can indeed use higher gasification temperature, and the energy is absorbed by the water-cooled wall. I think the high carbon conversion rate is not only achieved by using high gasification temperature. Whether it is Shell Neither dry coal powder nor Texaco coal-water slurry gasification technology can be perfect. Objectively speaking, both technologies have their own advantages and disadvantages: The advantages of shell gasification technology are high operating temperature, cold gas efficiency and carbon conversion rate are higher than Texaco coal-water slurry gasification technology, but its gasifier structure is more complex and completely needs to be imported (including soot filters and waste pots), resulting in high investment costs; and there is little domestic actual operation experience, and the technical risks are also relatively high. The advantages of Texaco's coal-water slurry gasification technology are simple equipment structure, high working pressure, rich operating experience, and relatively low investment costs. However, its gasifier requires a backup furnace, and the components in the furnace need to be repaired and replaced regularly. The operating temperature in the furnace and the cold gas efficiency are low. From the analysis of equipment failure rate, whether it is Shell gasification or Texaco coal-water slurry gasification, there is abrasion in the transportation links of raw coal and ash. Therefore, the above two processes are prone to malfunctions and equipment damage in the slag discharge system, ash discharge system and feeding system. Under the same conditions, the investment cost of introducing Texaco coal-water slurry gasification technology is about 90% of that of introducing Shell gasification technology. Personal opinion, for reference only.

It seems that the poster still has not realized the essential difference between the two gasification technologies. I suggest you go to my space to read my understanding and explanation, which should be helpful to you. Give you a link http://www.hcbbs.com/exp/index.php?uid-78618-action-viewspace-itemid-1394

The domestic second-generation Tsinghua furnace uses water-cooled walls, but we don’t know what kind of feed it uses. Tsinghua Furnace's fusion gasification technology can use either water-coal slurry or dry powder.

Could you please tell me about the space furnace? This one uses water-cooled walls.

Personally, I feel that Texaco does not have water-cooled wall technology, but it needs to determine which process is more suitable based on the post-working conditions and process flow requirements. Texaco coal-water slurry gasification seems to have a quenching process and a water-cooled wall process. The quenching process is mainly used in working conditions where the process gas needs to be changed in the post-processing section and requires a large water-vapor ratio. For example, ammonia synthesis, methanol synthesis, etc. require partial or complete conversion of the process gas. The conversion requires a large water-vapor ratio to facilitate the reaction. Under such working conditions, the quenching process is more advantageous. Similarly, if your process gas does not need to be changed in the subsequent section and does not require a large water-vapor ratio, it is of course more advantageous to choose a water-cooled wall. Personal opinion!

The factory I work for is coal-water slurry gasification. I personally think that Texaco does not use water-cooled walls but uses refractory materials because of the characteristics of the coal-water slurry gasification process. In coal-water slurry gasification, coal-water slurry generally contains about 35% water. This part of water consumes heat during gasification, and this heat is supplied by carbon combustion. After using the water-cooled wall, more heat will be consumed, so the effective gas content in the crude synthesis gas will decrease and the oxygen consumption will increase. At the same time, Texaco's refractory materials are more mature than water-cooled walls.

It should be the difference between the quenching process and the waste pot process.