吸收式热泵技术在某市利用电厂余热的大温差长输供暖中的应用研究
Application of Absorption Heat Pump Technology in Large Temperature Difference Long Transmission Heating System Using Waste Heat of Power Plants in a City

随着社会经济的发展，城市供暖面积也在快速增长，面对不断增加的供暖面积，利用电厂余热为城市供暖，该方式仅通过提高一次供水温度已不能满足供暖需求，为进一步提高原有一次管网的供暖能力，可通过吸收式热泵大温差改造技术——在保证一次供水温度不变的前提下，通过大幅降低热源电厂供暖回水温度以显著提高一次管网的供暖能力及热量利用率，以应对不断增长的供暖需求，为企业的综合效益的提高及未来的发展提供强有力的保障。在能源站建设改造中，由于城市原有大部分管网属于老旧管网，承压能力不能保证，因此选用热网子站做大温差改造的第二类中继能源站。结合某市热用户的供暖区域实际情况以及参考其它大温差供暖改造实例，确定适合该市的长输供暖方案——分区域实施集中式大温差改造，更利于短期内投入实施。为今后吸收式热泵技术在利用电厂余热的大温差长输供暖中应用提供参考。
Along with the development of social economy, the urban heating area is also in rapid growth. In the face of increasing heating area, waste heat of power plant is used for urban heating. This method can not meet the heating demand only by increasing the temperature of the primary water supply. In order to further improve the heating capacity of the original primary pipe network, the absorption heat pump large temperature difference transformation technology can be adopted —in a water supply guarantee under the premise of constant temperature, by reducing heat power plant heating water temperature to significantly improve the ability of a pipe network of heating and heat utilization, in response to the growing demand for heating, which provides a strong guar-antee for the improvement of the comprehensive benefit and the future development of the en-terprise. In the construction and reconstruction of energy stations, most of the original urban pipe network belongs to the old pipe network, and the pressure bearing capacity cannot be guaranteed, so the second type of relay energy stations, which are not reformed with large temperature differ-ence, are selected for the heat network sub-stations. Combined with the actual situation of heating area of heat users in a city and with reference to other large temperature difference heating reno-vation examples, the long distance heating transmission scheme suitable for the city is deter-mined—centralized large temperature difference renovation in different areas, which is more conducive to put into practice in a short time. It provides references for the application of absorp-tion heat pump technology in the long distance heating with large temperature differences using the waste heat of power plants.