A comprehensive thermal management system for a large-scale alkaline electrolysis water hydrogen production device

Abstract

This application relates to the field of electrolyzed water hydrogen production system, and specifically discloses a comprehensive heat management system for a large-scale alkaline electrolyzed water hydrogen production device. Heat medium, reducing the adverse factors affecting the stability of the integrated thermal management system; the integrated heat exchanger has two functions of integrating the heat recovered from hydrogen and the recovered heat from oxygen, and heating and redistributing the heat fluid used in the heat exchanger, which is beneficial to the comprehensive heat exchange. The heat storage medium in the heat storage tank in the heater stores energy at the initial stage of operation, and releases energy when the heat transfer temperature difference of the integrated heater decreases, easing the influence of the heat transfer efficiency reduction caused by the temperature difference on the heating effect of the circulating lye, and improving the overall heat transfer efficiency. Manage the working stability of the system and reduce the possibility of parameter error alarms in the production process.

Description

technical field [0001] This application relates to a hydrogen production system by electrolysis of water, more specifically, it relates to a comprehensive heat management system of a large-scale alkaline electrolysis of water hydrogen production device. Background technique [0002] Hydrogen production by electrolysis of water is to pass direct current into an electrolytic cell filled with electrolyte, and water molecules undergo an electrochemical reaction on the electrodes to decompose into hydrogen and oxygen. In the current production process, in order to improve the ionic conductivity of water and reduce the interference of other miscellaneous ions in the process of hydrogen production by electrolysis of water, the electrolyte generally uses lye (NaOH solution), and its process and production system are called hydrogen production by alkaline electrolysis of water. Processes and their systems. [0003] At the same time, due to the large amount of production and the heat...

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Problems solved by technology

[0005] The inventor found that it still has deficiencies. Because the heat recovered from hydrogen and oxygen are integrated, and the circulating lye is heated through multiple transfers, the flow rate and water content of hydrogen and oxygen are periodically affected by the electrolysis process. Small-scale fluctuations, the recovery heat also fluctuates in the heating effect of the circulating lye; on the other hand, the heat storage tank stores the high-temperature heat exchange medium during the high-power electrolysis process, and indirect heat exchange between the hydrogen gas phase and the oxygen gas phase during the storage process The amount of heat exchange medium in the heat exchange pipeline for recovering heat is continuously decreasing, and the heat exchange medium needs to be supplemented. The temperature of the supplemented heat exchange medium does not match the temperature of the outflow heat exchange medium, which causes the heat exchange system to fluctuate, and the system fluctuation will also affect The temperature of the heat exchange medium extracted to the heat storage tank forms a feedback loop, resulting in longer temperature fluctuations in the heat exchange system, lower heating stability, and difficult dynamic balance of working conditions.

[0006] In addition, during low-power electrolysis, the higher-temperature heat exchange medium is connected to the original heat exchange pipeline for heating the circulating lye for auxiliary heating, but the increased volume of the heat exchange medium must not match the original pipeline reserves, and the excess The heat exchange medium must have a storage device. The use time of auxiliary heating is limited by the size of the heat storage tank. After the heat exchange medium with a higher temperature in the heat storage tank is used up, auxiliary heating cannot be performed, which will continue to hinder production, and Excessively large heat storage tanks greatly increase the cost of equipment, the cost of heat exchange medium consumption and the cost of insulation

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