不同原料制备磺化剂SO_3/空气的热量对比

Comparison of energy consumption of different raw materials preparation sulfur trioxide/air

利用化工模拟软件Aspen Plus对磺化生产中以液态SO3、固态硫磺及液态硫磺为原料制备磺化剂SO3/空气的流程进行了模拟计算,并对3种工艺进行了能耗、热量分析。液体SO3放热工段释放热量不足以满足干空气加热所需的热量,但该工艺流程简单,大大节省项目投资费用与运行费用等。固体硫磺生产气体SO3可以产生大量余热,若能充分利用,可以降低运转投资成本。液体硫磺生产气体SO3可回收的余热更多,且避免了固体硫磺的粉尘污染。每套3.8 t/h磺化装置,需要浓度为3%的SO3工艺空气300 kmol/h,从干燥空气进入到SO3工艺空气,硫磺燃烧可利用的热量达2 569 605 k J/h,余热回收效率按60%计算,可生产0.8 MPa的饱和蒸汽868.5 kg/h。对于固体硫磺,去除熔硫所需热量,热损按10%计算,可生产0.8 MPa的饱和蒸汽221.6 kg/h。

Sulfonation agent SO3 was produced by vaporization of liquid SO3, combustion of solid sulfur or liquid sulfur respectively. Chemical simulation software Aspen Plus was used to simulate and calculate this process, and energy consumption as well as waste heat was analyzed at the same time. Heat released by exothermic section of liquid SO3 in liquid SO3 vaporization procedure can＇ t satisfy the heat requirement of dry air. However, this process not only is simple, but can reduce investment costs and operation expenditure. If the heat generated by the combustion of solid sulfur be fully utilized, the cost of operating and investment of this procedure would be cut down. Much more calorie, which can be recycled, is generated by the burning of liquid sulfur, in comparison with that of solid sulfur; and pollution of solid sulfur dust can be avoided in this procedure. The flow rate of mixture gas, in which the molar concentration of SO3was 3%, was typically 300 kmol/h for a sulfonation device of 3.8t/h capacity. If the heat is used to produce 0.8 MPa steam, given the heat recovery efficiency of 0.6, solid sulfur can generate 221.6 kg/h steam while liquid sulfur does 868.5 kg/h.