External heat source for hydrogen production via methanol cracking
Thread Content
Hello everyone: Due to the requirements for ultra-low emissions in terms of environmental protection, the company plans to phase out biomass boilers. The initial plan is to install a natural gas boiler. Some people have suggested using high-pressure steam (boilers with a capacity of 55 tons, operating at 9.8 Mpa and 500°C). There are two approaches: 1) Using steam directly through a converter and a vapor superheater; this would require the use of high-pressure equipment, and there are concerns regarding large fluctuations in reaction temperature； 2. Add another heat exchanger to use steam to heat the heat transfer oil, which is then used to supply heat to the pyrolysis system. Because it is far from the high-pressure steam source, and more equipment is required to use high-pressure steam. I’m not sure if this is done often enough; are there any successful cases? I would appreciate it if fellow travelers could share their insights. Thank you!
The second method is more reasonable, and it is easier to control during operation.
The second method is more appropriate, as Sichuan Asia United has a successful track record with the Quanzhou Sinochem Methylacrylate project. I was involved in this project.
With increasingly strict emission regulations nowadays, natural gas fuel boilers are also subject to NOx emission requirements; the second option is feasible if there is a high-pressure steam system (with saturated steam at least at 9.8 MPa). In the absence of high-pressure steam, there is now a new type of catalytic hot oil furnace that does not produce flames; it can be installed alongside methanol conversion units. The fuel used is methanol and PSA exhaust gas, resulting in low heat loss and emissions that meet environmental standards.