Can the heat from the generator slurry be utilized?
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This post was last edited by sgh1966 on 2009-8-6 at 14:58. The control temperature for wet-type acetylene generators is kept between 85–90°C; it can even be increased above 90°C for control purposes. The heat generated by the reaction of calcium carbide is extremely large: CaC2 + 2H2O = Ca(OH)2 + C2H2 + 130 kJ/mol. The heat released when 1 ton of calcium carbide reacts is equal to 1000*130*10^6/(64*4.2) = 1.116*10^8 kcal. If a lithium bromide chiller unit is used to utilize the heat from the calcium carbide slurry to cool the temperature from 95°C to 75°C, and assuming a thermal efficiency of 70% for such a chiller unit, the amount of heat that can be recovered (equivalent to cooling capacity) is 250*10^3*(95-75)*70 = 3.5 million kcal/h. A PVC plant with a capacity of 200,000 tons per year requires approximately 15 million kcal/h of cooling capacity, which is sufficient to meet 23% of the total cooling needs. Such a large amount of heat, if it could be utilized, would have considerable value. What are your thoughts and opinions, fellow sailors?
Thermal energy utilization of calcium carbide slag slurry: As calculated on the first floor, the waste heat generated by calcium carbide slag slurry is very high; however, to make effective use of this waste heat, a very large heat exchange area is required. Due to the high viscosity of the calcium carbide slurry and the uniform settlement of solids in the suspension, it is difficult to achieve effective utilization of its thermal energy. It seems that there are no similar achievements in the domestic market yet?
And how is the heat released by polymerization utilized?
The amount of heat generated throughout the chlor-alkali chemical process is enormous, in processes such as hydrogen chloride synthesis, VCM synthesis, and polymerization. Recovering low-grade thermal energy comes at a cost; the heat that is most suitable for recovery is that generated during hydrogen chloride synthesis, and it would be quite appropriate to use it for cooling in other processes.
It can be utilized in theory, but there are many practical challenges to overcome.
This post was last edited by wang*neng on 2009-8-8 at 10:09. Calcium carbide slurry tends to form scale, making it impossible to utilize its heat; the board owner is right – it’s better to consider the heat generated by vinyl chloride synthesis, as the hot water produced in this process, at 100–102°C, is very useful.
I’ve heard of heat utilization from calcium carbide slurry for the first time; such an idea should be encouraged, but I’m not in favor of this practice!