Is lithium bromide refrigeration considered an energy-saving project?
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Lithium bromide refrigeration uses the heat of hot water to convert thermal energy into cold energy. The hot water is then heated by coal in the boiler. Lithium bromide refrigeration itself also requires circulating water. In my personal opinion, this project cannot be completely regarded as an energy-saving project, but only converts one type of energy into another type of energy use.
In the synthetic ammonia production process, lithium bromide refrigeration technology is an energy-saving technology. The main reason is to recover the low-energy heat that cannot be recovered in the production of synthetic ammonia to produce cold energy and use it to save energy in production, so it is called technology.； In actual production, some companies are very good at energy conservation and recovery and are unable to adopt this technology. Therefore, in ammonia synthesis technology, some companies that can use this technology mainly have low-level energy, so it cannot be generalized and depends on the specific situation.
I agree with the point above. Lithium bromide refrigeration technology makes full use of the low-level heat energy in the production process of synthetic ammonia for refrigeration. It should be an energy-saving technology. Of course, it is considered an energy-saving project. I think the poster probably has to submit the project to the National Development and Reform Commission. No problem. The key is that the project and feasibility study must be done well. The poster will calculate and let the data speak for itself!
This is the original intention, but in fact, I personally think it is not energy-saving. I can only say that the same energy consumption can provide lower-temperature water than conventional open cooling towers or closed circulating water to meet production needs. No matter what low-grade heat source is used, the heat will eventually be taken away by circulating water, which consumes energy.
Lithium bromide refrigeration generally uses low-pressure steam or even hot water for refrigeration. Since many units have a large amount of surplus low-pressure steam or hot water, it is often drained and wasted. If this is used for lithium bromide refrigeration to obtain the required process or domestic chilled water, in this case, it can be regarded as energy-saving.
If the temperature or pressure is higher than the ambient temperature and is directly emitted without utilization, it is a waste of energy. If it can be utilized, it is an energy-saving measure. However, the return on investment period must be considered before deciding whether to utilize it.
How to make full use of the same energy to obtain the greatest economic benefit, which is what you need most. For example, you can calculate how much consumption the same heat will require if it is used in a boiler. If it is converted into the cooling capacity you need to reduce the temperature of the process medium and remove the power consumption, you think that is more cost-effective. Brother Yan, I think it is cost-effective for our industry to calculate the general ledger.
The energy required for lithium bromide refrigeration is generally the thermal energy carrier of the recovery system. If it is not recycled, it will be wasted. In this sense, it is an energy-saving project.
It is a good energy-saving project. Our company uses it quite well and the system temperature can be well controlled.
It is definitely not energy efficient to use a boiler to heat hot water to drive a lithium bromide refrigerator. The refrigeration efficiency of the lithium bromide refrigerator is converted into an electric-driven compression refrigeration system (water-cooled Freon refrigerator) COP value of around 4 (double-effect) or 2 (single-effect, hot water is single-effect), while the electric-driven compression refrigeration system (water-cooled Freon refrigerator) COP value currently reaches more than 5. Therefore, the hot water lithium bromide absorption refrigerator only has energy utilization advantages in places where waste heat and residual heat exist.
Personally, I think the essence of energy saving is how much energy is used originally and how much is used after transformation or optimization. If the latter is less than the former, it is energy saving. It does not depend on the process. Of course, energy is needed for production.