Regarding the heating method for brackish water in the chlorate decomposition system, direct or indirect?
Thread Content
This post was last edited by yhpsxj on 2020-3-31 at 21:41. I would like to ask the experts: regarding the heating method for brackish water in chlorate decomposition systems, are there any manufacturers that use direct heating, that is, where steam is mixed directly with the brackish water for heating? What are the advantages and disadvantages of the two methods?
You mean to heat directly without using a heat exchanger – why did you think of that?
Eliminate the heat exchanger to improve heat exchange efficiency: lol
It’s possible, as long as even heating can be achieved
With direct heating, a large amount of steam is generated, resulting in significant amounts of water condensing in the gas phase; with indirect heating, the plates we use are prone to corrosion
Needless to say, it definitely can’t be done. Since it is heat exchange, heat exchange equipment is necessary; if you remove that equipment, how can you ensure that the liquid and steam come into uniform contact for heat exchange? ； Furthermore, the pressure of low-pressure steam is generally only 0.1–0.2 MPa, while the pressure of the dechlorinated brine fed into the system is usually 0.4 MPa; as a result, the brine might leak into the steam pipes. Anyway, there’s no need to think about it; if it were possible to eliminate the heat exchanger, the design institute would have done so long ago
Direct heating can be used, and that’s what we employ; it is efficient as it eliminates the need for a heat exchanger. The downside is that it increases the amount of water in the system, while indirect heating requires additional thermal storage, and heat exchangers are prone to corrosion and leakage.
Direct heating for temperature control may be relatively laggy, and uniform mixing heating is difficult to adjust. But I have designed such factories before, and it is feasible
Direct heating makes it difficult to control the temperature and also reduces the concentration of the saltwater
I use steam for heating here; Ordos Chlor-Alkali Chemical Industry