制浆造纸业蒸汽价格及能源优化利用的探讨

The probe on steam price and optimum usage energy in pulp & paper industry

制浆造纸业,如何确定其自备电厂蒸汽价格历来都有争议,不同的蒸汽价格直接影响余热回收或其他节能措施的经济效益,会对决策层在选择使用能源种类、节能技术等问题上犯难,有时还会造成决策错误。本文介绍了一种计算新增或节降蒸汽的使用成本或价格的方法,指出了纸厂常用的低压或中压蒸汽的价格水平,并以此为依据对气罩余热回收的经济效益做了分析,同时还根据能源梯级利用的原则,对制冷、热风干燥、热风干燥的余热回收、污泥干化、靴压改造及蒸汽箱的应用等过程的能源使用进行了探讨。

There is always huge dispute regarding how to determine the steam price from the self-provided power plant in pulp and paper mills. Different steam price will affect the benefit evaluation of heat recovery as well as the other energy saving technology＇s application. It will also confuse the decision makers on how to properly select the energy source and energy saving technology. In some time the wrong decision was made due to the false steam price. This article introduced a new way to calculate the steam price for newly added steam or saved steam. The true steam price was discovered and the benefit of hood heat recovery in paper machines was analyzed accordingly. At the same time, the use of energy was discussed in the process of refrigeration, air dryer, exhaust heat recovery and sludge drying process, as well as shoe press transformation and steam box application according to the principle of cascade use of energy.