入冬以来，天津市东丽区的居民家中暖意融融。这份温暖并非来自传统的燃煤或天然气，而是源于 垃圾焚烧产生的余热。当地通过创新热能阶梯利用技术，将垃圾焚烧发电后原本被浪费的中低温余热， 经过特殊处理后输送至居民区，不仅成功实现部分热源替代，而且大幅降低了供暖成本。这场"变废为 暖"的实践，印证了利用余热供暖的巨大潜力，为城市供暖开辟了新路径。 冬季供暖是一项民生"暖心工程"。随着城镇化进程加快、极端天气多发，近年来，城市供暖需求持 续攀升。在传统供暖模式下，燃煤和天然气是北方冬季供暖的主角，但是"主角光环"并不能掩盖缺陷 ——天然气价格波动容易推高供热成本，部分地区财政补贴压力逐年加大。在冬季，北方地区大气扩散 条件不利，化石能源消耗加剧了环境负担，也增大了雾霾发生概率。 余热供暖大有可为。我国余热资源极为丰富，统计显示，仅30万千瓦以上火电机组的余热，便可满 足当前相当大面积城镇供热需求，钢铁厂、化工厂及垃圾焚烧厂的余热更是"沉睡的绿矿"。在此背景 下，探索多来源、多渠道供暖，既是缓解供热供需矛盾的现实选择，也是推动能源循环利用、实现绿色 低碳转型的必然要求。唯有打破单一热源依赖，才能在保障民生温度的同时，走出一 ...

Core Viewpoint - The article discusses an innovative heating solution in Dongli District, Tianjin, where waste heat from garbage incineration is utilized to provide residential heating, replacing traditional gas boilers. This "warm flow revolution" highlights the potential of waste heat recovery in addressing energy costs and environmental concerns [1][13]. Group 1: Waste Heat Utilization - Dongli District collects waste heat from two garbage incineration plants to supply heating to residential areas, transforming previously wasted energy into a valuable resource [1][7]. - The project utilizes a three-stage heat extraction system, which includes a turbine heat pump that efficiently captures and transfers heat from the incineration process [5][12]. - The incineration plants process approximately 1,900 tons of household waste daily, generating significant amounts of waste heat that can be repurposed for heating [7][13]. Group 2: Technical Innovations - Key technical modifications were made to the existing equipment, including the overhaul of three boilers to ensure stable operation and reduce failures during the heating period [4][10]. - The system's first stage uses steam at around 400°C to extract heat, while subsequent stages further refine the temperature for efficient heating delivery [5][10]. - The project has successfully achieved a heating temperature of around 70°C, meeting the heating demands of approximately 300 million square meters [10][12]. Group 3: Economic and Environmental Impact - The cost of heating has been significantly reduced from 110 yuan to 55 yuan per gigajoule, resulting in substantial savings for the local government and residents [10][12]. - The project is expected to lower carbon emissions by approximately 9.33 million tons annually, equivalent to the environmental benefit of planting 8.5 million trees [13]. - The initiative not only reduces government subsidies but also enhances the quality of life for residents by providing reliable heating at a lower cost [12][13]. Group 4: Challenges and Collaboration - The project faced numerous logistical challenges, including the need to lay 12 kilometers of pipeline across various terrains and infrastructure [7][8]. - A framework cooperation agreement was established to ensure fair pricing and investment returns, facilitating collaboration between different stakeholders [8][12]. - The successful implementation of this project serves as a model for other cities to explore similar waste heat recovery solutions, promoting urban sustainability and energy efficiency [13].