典型玉米深加工企业物能消耗与环境排放分析

Energy consumption and environment emissions analysis of a typical corn deep processing enterprise

为减少环境压力、实现玉米深加工行业可持续发展,选取能够代表中国玉米深加工行业平均水平的某企业作为研究对象,利用物质流分析法对生产过程的3个工段物质代谢情况进行分析,构建出各工段生产代谢模型.根据物质流分析指标计算公式,计算该企业的资源能源利用指标、污染物产生指标和物质平衡指标,具体数据如下:单位产品耗水量为5.4 m3/t、单位产品蒸汽消耗量为3.94 m3/t、单位产品耗电量为388 kW.h/t、综合废水产生量为11 139.7 m3/d、单位产品废水产生量为14.78 t/t、单位产品废气产生量为0.005 t/t、单位产品固体废弃物产生量为0.123 t/t、冷却水循环率为98.9%、资源利用效率为15.3%.据此提出企业节能减排的改进方案,促进企业提高生产系统的物能利用率.

To reduce environmental pressure and realize sustainable development of corn deep processing industry,a corn deep processing enterprise with average scale in China was selected to study in this paper.The metabolic models for the production of the corn deep processing enterprise were established using Material Flow Analysis Method.The material and energy consumption indicators,waste and emission indicators and material balance indicators were calculated according to the formula of MFA index,and the results were shown as follows： water consumption per unit of product is 5.4 m3/t,steam consumption per unit of product is 3.94 m3/t,electricity consumption per unit of product is 388 kW·h/t,wastewater generation is 11 139.7 m3/d,wastewater generation per unit of product is 14.78 t/t,air emission per unit of product is 0.005 t/t,solid waste generation per unit of product is 0.123 t/t,recirculating cooling water efficiency is 98.9%,and resource utilization rate is 15.3%.Based on the results,the strategy of enhancing material and energy utilization efficiency and reducing the environment pressure could be proposed.