热网及建筑物储热调峰过程热用户室温动态特性研究

Research on room temperature dynamic characteristics of heat user during peak regulation process based on heat storage of heat supply network and buildings

利用热网及建筑物储热特性实施的"热电解耦"运行方式,是加深热电机组调峰深度的有效途径;热网及建筑物储热后,研究热电机组在不同环境温度下热用户室温的动态特性对热电厂调峰具有重要意义。采用机组变工况模型、热网及建筑物换热模型,以某310 MW直接空冷热电联产机组为研究对象,分析供热期内机组在不同环境温度下建筑物蓄放热过程中热用户室温变化的动态特性。结果表明:利用热网及建筑物储热实施调峰,室外环境温度在5℃到-5℃之间变化,建筑物室内温度由20℃上升到24℃时,所需总蓄热时间在282.01~390.22 min之间;室外环境温度在-5℃到5℃之间变化,建筑物室内温度由24℃下降到18℃时,在纯凝工况下所需总放热时间在590.19~966.22 min之间,在最小功率工况下所需总放热时间在851.86~1 980.11 min之间;室外温度越高,总蓄热时间越短,总放热时间越长。

It is an effective method to utilize the decoupling heat-power operation model which applys the heat storage characteristics of heat supply network and buildings to increase peak regulation capacity of cogeneration units. It is important for cogeneration power plant to investigate the dynamic characteristics of the indoor temperature of thermal users under different ambient temperature. The off-design model and heat transfer model of heat network and building are adopted.Taking a 310 MW direct air cooling cogeneration unit as an example, the dynamic characteristics of the indoor temperature of thermal users is analyzed when the ambient temperature changed.Results show that when ambient temperature changes between 5 ℃ and-5 ℃, the total heat storage time is between 282.01-390.22 min for the indoor temperature rising form 20 ℃ to 24 ℃. When ambient temperature changes between-5 ℃ and 5 ℃, as the indoor temperature decreases form24 ℃ to 18 ℃, the total heat release time is between 590.19-966.22 min when the unit is in condensing condition. But the total heat release time is between 851.86-1 980.11 min when the unit is in minimum power condition. The higher the ambient temperature is, the shorter the total heat storage time is, and the longer the total heat release time is.