多热源集中供热系统水力性能优化方法

Regulation Method of Multi Heat Source Central Heating System

在建筑节能的趋势下,多热源联合的集中供热系统以其能源节约性、供热可靠性、系统灵活性等优势受到了行业的普遍关注。但由于热源数量的增加,集中供热系统的管网复杂度显著增加。对于大多数多热源集中供热系统,通常难以获得最佳水力工况以达到理想的供热效果。为此,提出了一种优化调节策略,其基本思想为:用图论的方法建立多热源集中供热系统的数学模型,结合协同论的思想,以系统总泵功最小为优化目标,以质量平衡、能量平衡、系统供需平衡为限制条件,并引入热源偏好性因子,建立协同优化方程,求解满足系统水力工况需求、热力工况需求、热源调度需求的最优调节方法。将该策略应用于某多热源集中供热系统,结果表明,优化调节策略可以将各换热站的供需匹配度保证在预期的范围内,同时,相较于压差控制策略,可以降低21%的系统总泵功。

Under the current general trend of building energy conservation,the multi heat source combined central heating system has attracted widespread attention in the industry because of its advantages such as energy conservation,heating reliability and system flexibility.However,due to the increase of the number of heat sources,the complexity of the pipe network of the central heating system increases significantly.For most multi heat source central heating systems,it is usually difficult to obtain the best hydraulic condition to achieve the ideal heating effect.In this paper,an optimal regulation strategy is proposed.Its basic idea is to establish the mathematical model of multi heat source central heating system by using the method of graph theory,combined with the idea of synergy theory,take the minimum total pump work of the system as the optimization objective,take the mass balance,energy balance and system supply-demand balance as the limiting conditions,and introduce the heat source preference factor to establish the collaborative optimization equation,solve the optimal regulation method to meet the requirements of hydraulic condition,thermal condition and heat source scheduling of the system.The strategy is applied to a multi heat source central heating system.The results show that the optimal regulation strategy can ensure the matching degree of supply and demand of each heat exchange station within the expected range.At the same time,compared with the differential pressure control strategy,the total pump work of the system can be reduced by 21%.