An open absorption heat heating system with high heat storage density

Abstract

The invention discloses an open absorption heat heating system with high heat storage density, which includes an open absorber, a cooler, an evaporation / condenser and a closed absorber; There are solution and cooling water pipes, the solution outlet of the open absorber is connected to the solution inlet of the cooler and the closed absorber respectively, and the solution outlet of the cooler is connected to the solution spray end of the open absorber; There are condensed water and cooling coils, and the top of the evaporator / condenser is connected to the closed absorber through a steam pipe; the closed absorber is equipped with a water pipe to be heated and a solution spray device, and the solution spray device is located above the water pipe to be heated , the outlet of the water pipe to be heated is connected to the heating end. The invention has heat storage function and thermal heating function. At the same time, since the closed absorber undertakes the function of increasing the heat output temperature, the open absorber significantly reduces the solution temperature through multi-stage cooling, and can obtain a higher latent heat recovery rate.

Description

technical field [0001] The invention relates to the field of absorption heat pump and flue gas waste heat recovery, in particular to an open absorption heat heating system with high heat storage density. Background technique [0002] In recent years, my country's annual industrial energy consumption has exceeded 2.9 billion tons of standard coal, of which more than 14% is discharged in the form of low-grade heat energy by industrial production equipment or systems. A large amount of industrial waste heat, especially waste heat resources with low temperature grade (generally below 150 ℃), cannot be effectively recycled and utilized under the existing energy utilization technology, which leads to the fact that my country's primary energy utilization efficiency is lower than the international advanced level. Low-temperature flue gas is one of the important sources of low-grade waste heat resources. The low-temperature flue gas also has a relatively high moisture content due to ...

AI Technical Summary

Problems solved by technology

However, the current single-effect open-type absorption heat pump cycle, such as CN101922821A, can realize the latent heat recovery of wet flue gas. However, affected by the temperature rise of the solution, the partial pressure of water vapor increases, which makes it difficult to recover the sensible heat of wet flue gas and weakens the moisture absorption capacity.

Patent CN 110513905 A increases the subcooler on the basis of the single-effect open absorption heat pump cycle to improve the sensible heat recovery of wet flue gas, but is still subject to the influence of solution temperature rise and water vapor partial pressure rise, resulting in weakened moisture absorption capacity

Images