水热同输管网水力工况分析

Analysis of hydraulic condition of water-heat co-transmission pipeline network

目前基于余热利用的水热联供技术对我国北方沿海地区实现清洁供热和保障安全供水具有非常重要的意义,水热同输管网作为水热联供系统的重要组成部分,对系统的安全和经济运行具有显著影响。文章基于水热同输原理建立水热同输管网水力计算数学模型,并分析和研究其水力工况。结果表明:随着回流比降低,回水压线变得较为平缓,中继回水加压泵扬程降低;中继回水加压泵需变频或调速运行调节并使其与回流比相等,以适应回流比的变化;随着回流比降低,回水管富裕压头急剧增大,其输送能耗则快速降低。

Currently,the water-heat combined supply technology based on waste heat utilization is of great significance for clean heating and water supply security in the northern coastal areas of China.As an important component of the water-heat combined supply technology,the water-heat co-transmission exerts a notable impact on the safety and economic operation of the system.This paper establishes a mathematical model for hydraulic calculation of water-heat co-transmission pipeline network based on the principle of water-heat co-transmission,and its hydraulic condition is analyzed and studied.The results indicate that with the decrease of reflux ratio,the return water pressure line becomes smoother,while the head of the relay return water pressure pump decreases.The relay return water pressure pump requires frequency conversion or speed regulation to match the reflux ratio,accommodating its variations.With the decrease of reflux ratio,the surplus head of the return water pipeline increases sharply,while the energy consumption for transportation decreases rapidly.