Recent developments in nozzle technology
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The nozzle is one of the key components in the vaporization process. With the advances in materials science, today’s nozzles are able to withstand increasing pressures and temperatures while still maintaining their service life. Could experts please provide their insights on the current state of gasification nozzles? Which nozzles can be used under conditions of 10 Mpa and 1500 degrees? Here is some information I found; it’s a bit outdated: The nozzle is the core of the water-coal slurry gasification technology. The performance of the nozzle directly affects the outcome of the gasification reaction, as well as the service life of the refractory bricks and the nozzle itself. Building on years of research and development efforts, East China University of Science and Technology, in collaboration with the former Lunan Fertilizer Factory and the Engineering Research Center for Water-Coal Slurry Gasification and Coal Chemicals, developed a new type of water-coal slurry gasification nozzle, thereby achieving both technological innovation and industrial application. The new types of nozzles are internal swirl nozzles and pre-film nozzles, among which the internal swirl nozzle has been granted a **patent. In 1995, new nozzles were subjected to industrial testing on the Texaco gasification unit at the former Lunan Fertilizer Plant. All the technical specifications of the new nozzle exceed those of the Texaco nozzle; it saves approximately 2.6% more coal and 2–5% more oxygen compared to the Texaco nozzle, while the carbon conversion rate increases by 2 percentage points. Seven of these parameters set new records for production at that time. The expert evaluation conducted under the auspices of the Science and Technology Department of the former Ministry of Chemical Industry concluded that it filled a gap in domestic research, established unique characteristics for China’s water-coal slurry gasification technology, and reached an internationally leading level. This project won the First Prize for Scientific and Technological Progress in Shanghai in 1998.
”Could the experts please provide their insights on the current status of gasification nozzles? Which nozzles can be used under conditions of 10 Mpa and 1500 degrees? “ It seems that the vaporization units don’t have such high pressures at the moment~ The pressure in Nanhua’s vaporization furnaces is 8.7 MPa
Yes, the current maximum value is 8.7 MPa, due both to the nozzles and to limitations of the equipment itself. If we consider only the nozzle itself, do you have any information on the latest developments in nozzles? Thank you.
What is the difference between an inward-rotating nozzle and a pre-film nozzle? ? Could some expert please explain it? ?
The pressure is mainly limited by the transfer pump; dry coal powder cannot reach such a pressure. As for water-coal slurry, there is no evidence to suggest that it can reach a pressure of 10 Mpa. Moreover, considering only the burner itself, it is likely that water-coal slurry burners will not have a long service life at 1500 degrees Celsius.