Design of Low Quality Heat Recovery and Utilization System for Fixed Discharge of Coal-fired Boilers

Abstract

In order to optimize the energy structure, increase the proportion of clean heat sources, and solve the problem of high energy consumption for heating, a waste heat recovery scheme is planned to be designed, which mainly recovers the waste heat of the 700MW boilers in the thermal power plant, which can be used to heat the condensed water of the steam turbine in summer., It can be used to heat the circulating water in the heating network in winter to achieve the goal of recovering heat and reducing energy consumption. In the design process, a lithium bromide absorption heat pump is used as the main system for low-quality heat recovery, and steam is used as a driving heat source to release heat in the generator to heat a dilute solution of lithium bromide to generate refrigerant vapor, thereby achieving high efficiency, energy saving and economic benefits. the goal of. At the same time, two booster pumps (one for transport and one for standby) are added to the condensate pipeline at the inlet of the low-low temperature economizer system to achieve the purpose of boosting the condensate. This design plan adheres to the concept of energy saving and environmental protection, and proposes a technical transformation route for low-quality heat recovery and utilization projects to achieve the goals of reducing production costs and increasing corporate benefits.