How lithium bromide works 5, how lithium bromide works

In lithium bromide absorption refrigeration, water is used as the refrigerant and lithium bromide is used as the absorbent. Due to the high boiling point of lithium bromide aqueous solution, it is extremely difficult to volatilize, and the vapor on the liquid surface of saturated lithium bromide solution can be considered to be pure water vapor. At a certain temperature, the saturated partial pressure of water vapor on the liquid surface of lithium bromide solution is less than that of pure water.

And the higher the concentration, the smaller the saturated partial pressure of water vapor at the liquid surface. Therefore, at the same temperature, the higher the concentration of lithium bromide aqueous solution, the stronger its water absorption capacity. This is why lithium bromide is often used as an absorbent and water as a refrigerant.

The lithium bromide absorption refrigerator is mainly composed of a generator, a condenser, an evaporator, an absorber, a heat exchanger and a circulating pump. During the operation of the lithium bromide absorption refrigerator, when the lithium bromide aqueous solution is heated by the thermal medium water in the generator, the water in the solution is continuously vaporized; As the water continues to evaporate, bromination takes place in the generator. The so-called solar cooling is the use of solar collectors to provide the heat medium water required by the generator for the absorption chiller.

The higher the temperature of the hot medium water, the higher the coefficient of performance (COP) of the chiller, and therefore the higher the refrigeration efficiency of the air conditioning system. For example, the temperature of the heat medium is about 60, and the COP of the refrigerator is about 0 40; If the temperature of the thermal medium water is about 90, the COP of the chiller is about 0 70;If the temperature of the thermal medium water is around 120, the COP of the refrigerator can reach more than 110. It has been proved in practice that the solar air conditioning technology scheme combining heat pipe vacuum tube collector and lithium bromide absorption refrigerator is successful, which opens up a new application field for solar thermal utilization technology.

Basic working principle: The solar absorption air conditioning system is mainly composed of two parts: a solar collector and an absorption refrigerator. 1. The working principle of absorption refrigeration: absorption refrigeration uses two substances.

It works in:Lithium bromideIn absorption refrigeration, water is usedRefrigerants, lithium bromide as an absorbent.

Lithium bromide absorption refrigerators are mainly composed of generators and condensers.

It is composed of several parts, such as evaporator, absorber, heat exchanger, and circulating pump.

Because the lithium bromide aqueous solution itself has a high boiling point and is extremely difficult to volatilize, the steam on the liquid surface of the lithium bromide saturated solution can be considered to be pure water vapor.

At a certain temperature, the saturated partial pressure of water vapor on the liquid surface of lithium bromide aqueous solution is less than that of pure water. And the higher the concentration, the smaller the saturation pressure of water vapor on the liquid surface. Therefore, at the same temperature, the greater the concentration of lithium bromide aqueous solution, the stronger its ability to absorb water. This is why lithium bromide is usually used as an absorbent and water as a refrigerant.

Lithium bromide units include lithium bromide absorption refrigerators and lithium bromide direct-fired refrigerators. Lithium bromide is made from alkali metals.

Lithium and halogens.

It is composed of two elements, molecular formula Libr, molecular weight, density of 3464kg cubic (25), melting point 549, boiling point 1265. Its general properties are roughly similar to salt, it is a stable substance, in the atmosphere has the properties of non-deterioration, non-volatile, insoluble, and very soluble in water, and is colorless granular crystals at room temperature, non-toxic, odorless, salty and bitter.

Lithium bromide aqueous solution is composed of lithium bromide and water, and its properties are very different from pure water. The boiling point of pure water is only related to pressure, whereas the boiling point of lithium bromide aqueous solution (mixture) is not only related to pressure but also to the concentration of the solution.

1. The lithium bromide unit uses the change of the phase state of water at low pressure (from liquid state to vapor state) to absorb the latent heat of vaporization to achieve the purpose of refrigeration. In the meantime, water is the refrigerant and the lithium bromide solution is the absorbent.

2. Lithium bromide unit, also known as lithium bromide absorption refrigeration unit, uses lithium bromide solution as absorbent material and water as refrigerant solution, and uses water to evaporate and absorb heat in high vacuum to achieve the purpose of refrigeration. In the lithium bromide unit, the evaporated refrigerant water vapor will be absorbed by the lithium bromide solution, and the solution will gradually become thin, this process occurs in the absorber, and then the heat energy is used as the power to heat the solution to separate the water, and the solution becomes thicker. In this way, the steam obtained in the generator condenses into water in the condenser, which is throttled and then sent to the evaporator for evaporation.

This cycle achieves the purpose of continuous refrigeration.

Redox reactions.

The main chemical principle of preparing lithium fluoride from lithium bromide is mainly the principle of redox wheel reaction, and then through the strength of oxidation, the cation exchange between the two is caused, and then the bromine ion is directly oxidized to bromine element.

Lithium bromide production process, lithium fluoride formula and lithium chloride preparation process and application.

1. Lithium bromide absorption cold (hot) water unit with power-off protection function.

2. Air expansion and moisture absorption lithium bromide absorption refrigeration method and its unit.

3. Multi-functional direct-fired two-pump lithium bromide cold and warm water unit.

4. Direct-fired pumpless civil lithium bromide hot and cold water unit.

5. Rotary lithium bromide refrigerator.

6. Single-pump, vertical small and medium-sized lithium bromide absorption refrigerator.

7. Spiral plate lithium bromide absorption refrigerator.

8. Borosilicate glass with high chemical stability and low viscosity containing zirconia and lithium oxide.

9. Aluminum electrolyte containing lithium fluoride and magnesium fluoride.

10. A method for extracting anhydrous lithium chloride from lithium-containing brine.

11. Lithium bromide absorption refrigerator cooling water system.

12. Lithium bromide absorption refrigerator.

13. Coal-fired direct-fired lithium bromide refrigerator.

14. A process method for pre-cooling the concentrated solution of lithium bromide absorption refrigerator.

15. Coarse tung comm material for anode material for lithium secondary battery and method for preparing lithium nickel oxide and lithium secondary battery.

16. Process method for producing lithium hydroxide by roasting lepidolite lime.

17. Direct method of lithium bromide purification process.

18. Control method for lithium bromide synthesis process prepared by direct method.

19. Method for removing bromate in lithium bromide solution.

20. Non-corrosive lithium bromide and its production process.

The main chemical principle of the preparation of lithium fluoride from lithium bromide is mainly the principle of oxygen high-loss reduction reaction, and then through the strength of oxidation, the cation exchange between the two is caused, and then the bromine ion is directly oxidized to Qi Di Shen bromine element.

During the operation of the refrigerator, when the lithium bromide aqueous solution is heated by the thermal medium water in the generator, the water in the solution is continuously vaporized; The water vapor enters the condenser and is cooled by the cooling water and condenses; With the continuous vaporization of water, the concentration of the solution in the generator continues to increase and enters the absorber; When the water in the condenser enters the evaporator through the throttle valve, it expands rapidly and vaporizes, and absorbs a large amount of heat from the refrigerant water in the evaporator during the vaporization process, so as to achieve the purpose of cooling and refrigeration; In this process, the low-temperature water vapor enters the absorber and is absorbed by the concentrated lithium bromide solution in the absorber, and the concentration of the solution gradually decreases, and the solution is pumped back to the generator to complete the whole cycle.

The advantages of lithium bromide are: lithium bromide is cheap, high stability, melting point is 549, boiling point is 1256, so it can be considered non-volatile at room temperature or general high temperature. Soluble in water.

Water is the refrigerant of lithium bromide air conditioner, and lithium bromide is the absorbent, so it is also very cheap. Lithium bromide is also non-decomposing in the atmosphere.

Lithium bromide refrigeration principle Single-effect lithium bromide absorption refrigerator generally uses steam or 75 140 hot water as the heating heat source, and the thermal coefficient of circulation is low (generally. If a vapor with a higher pressure (e.g. above the gauge pressure) can be utilized, a double-effect lithium bromide absorption refrigeration cycle can be used, and the thermal coefficient can be increased to more than 1. The double-effect lithium bromide absorption refrigerator is equipped with a high-pressure generator and a low-pressure generator in the unit at the same time, and the high-pressure vapor (generally heated by a high-temperature heat source such as gas and fuel oil) is used in the high-pressure generator to heat the low-pressure generator, so that the lithium bromide solution in the low-pressure generator produces a cooler water vapor with a lower temperature, which not only effectively utilizes the latent heat of the refrigerant water vapor, but also can reduce the heat load of the condenser, so that the economy of the unit is improved.

Single-effect lithium bromide absorption refrigerators generally use steam or 75 140 hot water as the heating heat source, and the thermal coefficient of circulation is low (generally. If a vapor with a higher pressure (e.g. above the gauge pressure) can be utilized, a double-effect lithium bromide absorption refrigeration cycle can be used, and the thermal coefficient can be increased to more than 1. The double-effect lithium bromide absorption refrigerator is equipped with a high-pressure generator and a low-pressure generator in the unit at the same time, and the high-pressure vapor (generally heated by a high-temperature heat source such as gas and fuel oil) is used in the high-pressure generator to heat the low-pressure generator, so that the lithium bromide solution in the low-pressure generator produces a cooler water vapor with a lower temperature, which not only effectively utilizes the latent heat of the refrigerant water vapor, but also can reduce the heat load of the condenser, so that the economy of the unit is improved.

The lithium bromide refrigerant used in refrigeration compressors is an aqueous solution of lithium bromide (formed by dissolving a solid lithium bromide solute in an aqueous solvent), which is a colorless and transparent liquid; The concentration is not less than 50%; pH above 8. At room temperature and pressure, the boiling point of water is 100, while the boiling point of lithium bromide is 1265.

In lithium bromide absorption refrigeration compressors, water is used as a refrigerant to produce a cooling effect, and lithium bromide solution is used as an absorbent to absorb the refrigerant vapor after the cooling effect. Therefore, water and lithium bromide solutions make up the working fluid in the refrigeration compressor. Zhiyun Refrigeration is very honored.