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首页> 外文会议>International sorption heat pump conference >Comparison of two absorption processes of absorption heat pump used in district heating systems: Falling-film absorption and spraying column absorption
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Comparison of two absorption processes of absorption heat pump used in district heating systems: Falling-film absorption and spraying column absorption

机译：地区供热系统中吸收热泵两种吸收过程的比较：下降膜吸收和喷涂柱吸收

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Absorption heat pump is the key component of novel district heating systems based on absorption cycles. In this system, the absorption heat exchanger in heating stations is a kind of absorption heat pump which has a vertical multistage structure. This paper mainly discusses the heat and mass transfer form and the structure of absorber. The LiBr solution needs to be cooled before entering into absorber because of the large temperature difference between generator and evaporator. Also the solution usually needs to be cooled between different stages. Thus a new kind of absorption process is proposed, which is different from the traditional falling-film absorption. In this kind of absorption process, the LiBr solution is sprayed into columns for absorbing steam in the absorption space, and is only cooled outside the absorber and between neighboring stages. A simplified mathematical model for this kind of absorption was developed to predict the performance of heat and mass transfer process. The simulation results for temperature distribution and mass transfer performance are presented. The spraying absorption process and the ordinary falling film absorption process are compared using the simplified mathematics models to see whether the new kind one can save heat and mass transfer area and volume of the absorption heat exchanger. The comparison is based on real working conditions of district heating systems. The performance of the spraying column absorption process was also experimentally investigated in an absorption experimental unit on a vacuum experimental platform. The mass transfer coefficient in some cases is obtained by analysis of experimental results. The experimental results and coefficients can be used in the mathematical model and direct us to design the absorption heat pump.
机译：吸收热泵是基于吸收循环的新型地区供热系统的关键组成部分。在该系统中，加热站中的吸收热交换器是一种具有垂直多级结构的吸收热泵。本文主要讨论热量和传质形式和吸收器的结构。由于发电机和蒸发器之间的温差大，因此需要在进入吸收器之前冷却LIBL解决方案。此外，溶液通常需要在不同阶段之间冷却。因此，提出了一种新的吸收过程，其与传统的下降膜吸收不同。在这种吸收过程中，将LIBR溶液喷射到用于吸收吸收空间中的蒸汽的柱，并且仅在吸收器外部和相邻阶段进行冷却。开发了这种吸收的简化数学模型，以预测热量和传质过程的性能。提出了温度分布和传质性能的仿真结果。使用简化的数学模型比较喷涂吸收过程和普通的下降膜吸收过程，以了解新的类型是否可以节省热量和传质换热器的容积。比较基于地区供热系统的实际工作条件。喷涂柱吸收过程的性能也在真空实验平台上在吸收实验单元中进行实验研究。通过分析实验结果，获得一些情况下的传质系数。实验结果和系数可用于数学模型，并指示我们设计吸收热泵。

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