Converter heating method
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When driving, is it better to use an electric furnace for heating, or a method that relies on stored heat for heating? A company in Yangzhou designed a system for us that uses heat storage for temperature elevation. Since we are new to the field of sulfur-based acid production, we are worried that it will be difficult for us to manage this heat storage process in practice. We’ve heard that improper handling of this process can lead to catalyst poisoning. Our plant has a capacity of 120 kt/a; we would appreciate any advice you can offer! ! ! ! ! ! ! !
It is possible to raise the temperature directly using diesel; the heat storage method consumes more diesel. Moreover, the sulfur incineration furnace has to be heated repeatedly, facing the challenges of thermal expansion and contraction.
It depends on individual habits, just like when starting up a boiling furnace to raise its temperature: some people prefer diesel, some prefer wood, and some prefer mixing sulfur with the raw materials at the beginning of the process.
Our company uses electric furnaces for heating; each furnace is equipped with five sets of thermistors, which offers flexibility, allowing the number of sets to be selected according to the temperature requirements of each stage
We’re beginners; we’re worried that we won’t be able to control the temperature properly and end up damaging the catalyst!
A heating tube electric furnace can be used, which is safe and convenient.
Heating is achieved using an electric furnace, which is convenient and flexible; the number of heating elements to be used can be selected according to the temperature requirements for each section
We have been operating this sulfur-based acid production plant for ten years now, and the regenerative heating system works very well in all aspects! There are two stages involved: indirect heating and direct heating. The key points are: 1, the diesel must burn completely; 2, direct heating of the catalyst should begin only after a certain temperature is reached.
For small sulfuric acid plants, heating can be achieved using electrical circuits, but large plants require diesel-fired preheaters. It is essential to keep them clean; otherwise, the catalyst will be damaged. If there are two systems, a secondary line can be installed. This is faster
For electric furnace heating and firewood heating, it mainly depends on the degree of conversion. Electric furnaces are easy to heat up and easy to control, but they consume more energy than diesel furnaces; therefore, they are not suitable for large sulfuric acid plants. With diesel, it’s relatively more troublesome as valve switching is required. It’s not as prone to poisoning as a catalyst; by observing the color of the flue gas when the temperature rises and paying attention to adjusting the air-to-fuel ratio, there are no problems. Our factory has been using regenerative heating, and there have been no issues since the catalyst was introduced. A more common problem is the lack of control over the sulfur sublimated from the feed materials; even one occurrence of this can have devastating consequences.
The temperature can be increased directly using diesel; proper control of the furnace temperature has little impact on catalyst activity, while also saving energy.
The small device can use an electric furnace; what is known as heat storage for temperature rise actually becomes direct temperature rise in practical operation.
It is best to first heat up by storing heat; once the temperature of each catalyst layer reaches above 150 degrees, direct heating can be carried out using high-temperature diesel flue gas. Of course, indirect heating or heating with an electric furnace may be beneficial for protecting the catalyst.
After all, the original poster really does have different insights. My company indeed raises the temperature without using heat storage, and I believe most companies do the same. Apart from the initial startup phase, using heat storage to raise the temperature is too slow and troublesome; moreover, there’s no specific requirement from the company in this regard. Raising the temperature directly saves fuel, which pleases the boss. As for protecting the catalysts, there are often much more serious issues in production, and it’s not possible to tell right away.
This post was last edited by txglyl on 2009-5-13 20:46: Electric heating furnace