【 Weak current College 】 LIBR cold failure causes and prevention methods

A refrigerator cold lithium bromide produced cold failure reasons
Cooling failure refers to refrigerator cooling capacity diminishes with time, and the cooler itself manufacturing and operating conditions, usually about 1% per year. If the year cooling failure rate is 3% to 5%, that is seriously cool failure; if more than 10%, the nameplate values and after repair is still more than 10%, which indicates that the unit performance has been poor.
Chillers with cooling failure and tightness, water quality stability, solution, pumps, etc, they affect the vacuum unit, the amount of heat, inner circle, so that the cooling capacity.
1.1 tightness
LIBR require vacuum in 100Pa following, guarantee the refrigerant evaporating. Vacuum degree higher cooling capacity. Therefore, the unit running process if the tightness is affected, thus affecting the vacuum, the impact of refrigerating capacity.
Impact unit air tightness: ① ② seam sealing; heat exchanger tubes expansion; ③ valve, pump, sight glass sealing.
1.2 water stability
And lithium bromide refrigeration units run related media with cooling water, chilled water, water vapor. Steam from the boilers, water treatment, generally will not have the scale, algae, sediment, water quality can be guaranteed to have no effect on the generating units. Unit runs, operable on gas is going to take a portion of the water, the system expansion and contraction will also have some water loss. In order to ensure the unit correctly, add water, generally run 24 hours to add more than 10 kg of water, add content, and to the unit operation. Cooling water is obtained by cooling towers, evaporative capacity up to 1% to 2%/h. 24h unit operation, would add a lot of water for cooling water, water quality due to higher requirements to ensure that non-scaling, non-corrosive, not long, not health mud, otherwise it will affect the unit heat effect, thus affecting unit refrigeration capacity.
1.3 LIBR
In LIBR refrigeration units, average concentrations of aqueous solution of LIBR around 55% for heat and mass transfer and loop running. LIBR aqueous solution of quality directly affects the capacity of the refrigerating unit, its PH value and inhibitor is a key unit corrosion protection because they absorb the heat pipe surface after affect heat effects; and corrosion of impurities can clog the spray nozzle, leaching shock plate hole, thereby directly affecting the spray effects; at the same time, the impurities can clog the tubes and shielding pump strainer, directly affects the amount of solution cycle; if impurities into the shield pump, affect the shield pump rotation and mobility solution; if the shielding pump cooling fluid channel is blocked, you will burn out canned motor pump.
1.4 shield pump
Canned motor pump in LIBR refrigeration units in like a human heart, is the moving part, itself a performance decline. Without regular maintenance, or shield pump their own poor performance, all affect the solution cycle, resulting in the cold.
In addition, cooling towers, pumps, steam, fuel oil, gas, and also on the cooling capacity of the chillers.
Prevention of secondary cooling failure
① in product manufacturing process strictly "clean seal". Clean, prevent impurities and dust during the manufacturing process into the unit itself, and in the manufacturing process is completed with clean air and clean water cleaning unit. Seal, is the guarantee that the service has no welds, heave. Should increase gas tightness requirements, and nitrogen cover the total leakage detection method.
② the strict control of impurities and lithium bromide solution PH value. Use a better effect of lithium do inhibitors. To periodically check for solution of total impurity, pH, lithium content and octanol (energy enhancers), ensure that the requirement range.
③ choosing quality of pumps, valves, sight, and mount the unit prior to the effective detection, who do not meet the requirements.
④ regular detection of cooling water. If water quality is poor, and Nalco and algaecide and pipeline install electronic descaling Miriam. Each season run before joining of chilled water, the water must meet the requirements necessary to undergo treatment.
⑤ for cooling towers, pumps and other auxiliary equipment, in addition to selection by product specification, also carry out regular maintenance and inspection.
⑥ If found unit leaks, to detect leaks and repair welding, fill expansion, replacement parts, repair, at the same time air tightness test to achieve the required targets.
⑦ cooling water, chilled water pipeline scaling, through mechanical cleaning and chemical cleaning washing lines, so that the pipeline remains good heat effect.
⑧ by impurities filtering purge, Hydrogenation of Lithia adjustment of the pH value, plus maintain solution of lithium inhibition, Octyl enhanced cooling capacity, regeneration solution.
3 conclusion
LIBR cold failure is objective and existent, lightly. If taken seriously, take effective measures, it is entirely possible control.