What is Lithium Bromide?
Lithium bromide is a desiccant salt, lithium ion in lithium bromide solution forms a strong bond with water molecules that creates the necessary absorption effect for the operation of the chiller, the concentration of lithium bromide used in absorption chillers is between 58 to 62%. This range provides the most efficiency for flash vapor absorption.
Lithium bromide in absorption chiller
Lithium bromide is highly corrosive and can degrade various metals used in absorption chillers . Chemical adjustment of the solution and corrosion control are important to prevent equipment malfunctions.
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The lithium bromide solution used in absorption chillers must be suitable for the operating conditions of the device and free of harmful impurities. The Abara lithium bromide solution chiller is made by Abara factory in Japan and has the highest purity (99.8%) among similar models.
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It should be noted that lithium bromide solution is also produced for other industrial uses, which if used in absorption chillers, while increasing the possibility of crystallization, greatly increases the corrosion rate of the device and reduces the life of the device, one of the most important impurities in the solution. Industrial lithium bromide can be referred to as chlorine, iron and sodium.
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Anti-corrosion agent in chillers
Two types of anti-corrosion agents are added to lithium bromide solution in chillers. Until about 10 years ago, lithium chromate Li2CrO4 was used as an anti-corrosion agent in devices, but in recent years the use of Сr in industry has been banned by the World Health Organization. Therefore, in recent years, Li2moO4 (lithium molybdate) has been used in lithium bromide solution.
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Complications of chromate include leukemia and the loss of cartilage in the airways such as the nose, as well as the loss of cartilage in the corners and any nearby organs in the long run . Chemically, the solution must be analyzed. The sample taken from the system must represent the soluble conditions in the whole device in order for the injection of lithium bromide into the system to be properly met.
Samples can be taken from different parts of the device, dilute lithium bromide is found at the point where water is absorbed and sent to the condenser for heating.
In some cases, during system repairs and maintenance, the solution in the system is drained and stored in a barrel.
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Sampling and analysis of lithium bromide
It should be noted that each sample can be valid, but may not reflect the chemical properties of the whole system, samples that are sent to the laboratory to analyze the results should be removed from the system under normal operating conditions, the best point to remove The correct sample and implementation method for this area should be determined by inquiring from the device manufacturer.
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When sampling is not possible when load is applied to the system, the amount of lithium bromide can be accurately determined by mixing samples taken from different parts of the absorption system. The chemical behavior of lithium bromide is an unbalanced process and the reactions Constantly occur in it.
Even in a sample container of 24 hours, the chemical properties of the bromide salt solution can change significantly. Especially if external factors such as air leakage in the system are influential.
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The speed of receiving and reviewing the samples by the laboratory is very important, an experienced specialist can determine the time index of the samples based on past experiences and adjust possible changes.
The test methods are the same as the usual chemical methods, but there are some differences in some cases. It is very important that the tests performed on lithium bromide are more accurate than the tests performed on water samples taken from boilers or towers. Cooling is done.
Rose Calibration Company in Melbourne, Australia with over ten years of experience provides all calibration, maintenance, and repair services throughout Australia. If you live in Sydney, Melbourne, Adelaide, Perth, Geelong, and Brisbane, you can receive your quote in less than two hours by fill-up the form via the “Booking” link.