The importance of vacuum in lithium bromide chillers
Lithium bromide absorption refrigerator is a kind of refrigeration equipment that must maintain a high vacuum state for stable operation. To this end, the air and other non-condensable gases in the unit should be discharged in time. The reasons why a high degree of vacuum must be guaranteed are:
Guarantee the cooling condition of the unit
Only by keeping the absorption refrigerator in a high vacuum state, can a low-pressure environment be formed in the evaporator, so that the refrigerant water can be evaporated at a low temperature (4 ~ C ~ 5 "C), and the stability of the refrigeration condition can be achieved. If there is air, the partial pressure of the air will increase the pressure in the unit, and the evaporating temperature of the refrigerant will increase, resulting in the inability to obtain the required cold water temperature and refrigeration capacity.
Even if there is a small amount of non-condensable gas such as air in the absorber, although it will be evenly distributed on the unit towel like other refrigerant vapors when the unit is shut down, but when the unit is running, it will accumulate on the surface of the heat transfer tube, affecting the heat transfer. quality performance, which seriously hinders the absorption heat transfer performance.
Prevent corrosion in the unit
The main materials of absorption chillers are steel and copper, while lithium bromide is a salt, which is corrosive. If there is air in the unit, the surface of the metal material will be corroded due to the oxygen in the air, which will affect the durability and life of the unit.
Influence of non-condensable gas on unit operation cycle
It is impossible to keep a lithium bromide refrigerator completely free of non-condensable gas. If there is a small amount of non-condensable gas, what effect will it have on the running unit?
If there is non-condensable gas in the operating unit, the evaporating temperature of the refrigerant in the evaporator will rise, which will increase the temperature of the cold water and fail to meet the cooling capacity requirement. Since the temperature of the cold water cannot reach the required low temperature, the demand for the heat source of the operating unit increases, so that the concentration of the absorbing liquid increases, the temperature and pressure of the high temperature regenerator rise, and then the safety protection to prevent the temperature and pressure of the high temperature regenerator from being too high is caused. The device operates and the unit stops.
The circulation of the absorption liquid moves in the direction of high temperature and high concentration, and it is close to the crystallization line, which becomes the main reason for the crystallization of the absorption liquid.
The decrease of the absorption capacity of the absorbing liquid in the absorber to the refrigerant usually leads to an increase in the demand for heat source, and the operation of the unit is uneconomical. Due to the effect of the corrosion inhibitor described later, a small amount of non-condensable gas is often produced, mainly hydrogen. As the temperature of the absorption liquid rises, the amount of hydrogen produced also increases significantly, which further increases the amount of non-condensable gas in the unit. The poor vacuum degree of the unit will cause the temperature of the high-temperature regenerator to rise, which will lead to the action of the safety protection device and the increase of heat source consumption; at the same time, it will also cause the decrease of the unit's absorption capacity, and then the heat source consumption will increase, the cooling effect will be poor, and even crystallization will occur. In the final analysis, the series of abnormal conditions that appeared in the unit were caused by the poor vacuum degree of the unit.
Production Application
The company’s main business scope includes: central air-conditioning maintenance, cleaning and technical services; cooling tower and fan coil cleaning and maintenance services; custom processing of lithium bromide solution; sales of lithium bromide solution special impurity separators; central air-conditioning host and various zero Sales of accessories; installation and sales of central air conditioning systems, etc.
Widely used in major air-conditioning systems and process refrigeration cold and heat sources; in steel, textile, chemical, electronics, pharmaceutical, food and other industrial and mining enterprises, as well as hotels, theaters, hospitals, and large commercial buildings , Central heating stations and other occasions are widely used.
Contact Us
Ms. Guo- Sales Support & Operations Manager.
Email: mdguolijuan@zjflier.com
Mob: +8615358588768
WeChat: + 86 15358588768
WhatsApp: +86 15358588768
