Installation and operation of the cooling system in the clean room
Installation and operation of the cooling system in the clean room
Before the operation and adjustment of the refrigeration system, you must be familiar with the performance of each equipment, the flow direction of the refrigerant, and the opening and closing of the valve. When the system is in normal operation, the evaporation temperature should be 8-10°C lower than the temperature of the cold storage; gravity liquid supply system, strictly control the opening size of the regulating valve, ...
Text label: Clean room supporting refrigeration system, refrigeration system installation and operation
Installation and operation of the cooling system in the clean room
Before the operation and adjustment of the refrigeration system, you must be familiar with the performance of each equipment, the flow direction of the refrigerant, and the opening and closing of the valve. When the system is in normal operation, the evaporation temperature should be 8-10°C lower than the temperature of the cold storage; the gravity liquid supply system strictly controls the opening size of the regulating valve to keep the pages in which the ammonia liquid separates stable. When the heat load of the warehouse changes, the liquid should be adjusted accordingly. The opening degree of the liquid supply valve on the distribution station, the appropriate warehouse for liquid supply can maintain a stable low temperature; the ammonia pump liquid supply system is used, mainly relying on the remote control liquid level device or the floating ball valve to control the liquid level in the low-pressure circulating barrel, and at the same time pay attention to the electromagnetic The sensitivity of the valve and other valves and the operation of the ammonia pump; the condensing temperature is generally 5-7°C higher than the outlet temperature of the cooling water. When a circulating water cooling system is used, new water should be added according to the water temperature; it should be determined according to the heat load. The number and start-up time of chillers in the refrigeration system.
In addition to refrigeration compressors, refrigeration systems also include oil separators, condensers, intercoolers, liquid receivers, air separators, low-pressure circulation barrels, drain barrels, and air coolers. The situation can be divided into three pressure parts: high pressure, medium pressure and low pressure. High-pressure part, oil separator In the refrigeration system of cold storage, washing type oil separator and packing type oil separator are generally used, and the freon refrigeration system adopts filter type oil separator; when the vertical shell and tube condenser is in normal operation, pay attention to the cooling water can not be used. Interrupted, the pressure should not exceed 14.7*105Pa. Except for the oil discharge valve and the air discharge valve, all other valves should be opened. According to the pressure and condensation temperature, it is decided whether to discharge air and whether to remove scale. After the horizontal condenser stops running in winter, The cooling water should be drained to avoid freezing the equipment; the accumulator is to store the high-pressure liquid refrigerant from the condenser to ensure the uninterrupted circulation of the refrigerant in the system and the incompatibility of the liquid supply of the cold storage due to the increase or decrease of the heat load. Paradoxically, the reservoir pages must not exceed 80% and less than 30% of their volume. In the middle pressure part, the operation of the intercooler, the liquid supply of the intercooler is controlled by the manual adjustment expansion valve and the remote control liquid level controller. Refrigeration effect, the liquid level is too high, it will cause the high-pressure refrigerator to run into the tide, so the duty personnel should adjust the opening of the liquid supply valve according to the liquid level displayed by the liquid level indicator and the suction temperature of the high-pressure refrigerator; When the cooler stops working, the intermediate pressure should not exceed 3.92*105Pa, and pressure reduction measures should be taken when it exceeds. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and purification workshops.
In the operation of the low-pressure circulation barrel, first check whether the oil drain valve and the liquid outlet valve are closed, and other valves should be opened. If there is air in the system equipment, the mixed gas can be released through the air separator. When releasing the air, first open the steam return valve; open the mixed gas inlet valve; slightly open the liquid supply expansion valve to cool the mixed gas. The opening size of the liquid expansion valve; when the shell of the air separator is cold, the vent valve can be opened. To control the opening degree, the air vent pipe is inserted into the water. If the color of the water in the bucket is found to be milky white, it means that the air has been released and the ammonia gas has entered the water. , the air release valve should be closed immediately to stop air release. Before starting the cooler, check whether the fins of the axial flow fan are rubbing against the housing or the bearings are poorly lubricated. During operation, the finned tube group should be evenly frosted. If the frost is uneven or the lower part is frosted, or the upper part is not frosted, If the liquid supply is abnormal, it should be adjusted, and the liquid supply must be increased; if the frost layer is too thick during operation, defrosting should be performed, otherwise the frost layer will hinder the air circulation and reduce the heat exchange effect, resulting in prolonged cooling time or temperature drop. go down.
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