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在焦化厂中,从焦炉出来的650°C～700°C的高温煤气,经喷淋氨水后,温度降到80°C～85C°,然后,进入煤气初冷器进一步冷却,使其温度降到25°C—35°C,再用鼓风机送到回收工段提取炼焦副产品。在这个过程中,不仅使大量高温位热能变为不能利用的低温位废热而白白浪费掉,而且要消耗大量冷却水。 我国从1970年开始,把煤气初冷器的余热用于城市供暖,这项技术已被东北地区许多单位所采用,并且取得了较好效果。 在煤气初冷器余热用于供暖初期,采用一段冷却工艺系统,如图1所示。
In the coking plant, the high-temperature gas from the coke oven at 650°C to 700°C, after spraying ammonia water, the temperature drops to 80°C to 85°C, and then it enters the gas cooler to further cool it to its temperature. It is reduced to 25°C-35°C, and then sent to the recovery section for extraction of coke by-products with a blower. In this process, not only a large amount of high-temperature heat energy becomes unusable low-temperature waste heat and is wasted, but also consumes a large amount of cooling water. Since 1970, China has used the waste heat from the gas cooler for urban heating. This technology has been adopted by many units in the Northeast and has achieved good results. In the initial stage of the heating of the gas cooler, a cooling process system is used, as shown in Fig.1.