Safe operation management of supporting refrigeration system in dust-free workshop
Safe operation management of supporting refrigeration system in dust-free workshop
Although the pressure of the refrigeration system belongs to the medium and low pressure category, in order to ensure the safe operation of the refrigeration system, not only the correct design, correct material selection, careful manufacture and inspection, but also correct use and operation must be done; Are you in a...
Text label: Refrigeration system for dust-free pharmaceutical cleanroom, safe operation management, design and installation of dust-free workshop
Safe operation management of supporting refrigeration system in dust-free workshop
Although the pressure of the refrigeration system belongs to the medium and low pressure category, in order to ensure the safe operation of the refrigeration system, not only the correct design, correct material selection, careful manufacture and inspection, but also correct use and operation must be done; Whether it is in a safe state, the main monitoring method is to display the pressure of each part of the system through the pressure gauge, which is convenient for normal operation management on the one hand, and on the other hand, in order to detect whether there is abnormality or overpressure in the refrigeration equipment in time, which is convenient for control. ;In order to prevent overpressure operation, set a safety valve or pressure control relay, or differential pressure control relay on the refrigeration equipment. Once the working pressure is abnormal and overpressure operation occurs, the safety equipment will automatically act to discharge the gas in the equipment to In the atmosphere, or automatically shut down, to ensure that the refrigeration system will not have problems due to overpressure operation, so the pressure protection safety equipment must not be arbitrarily adjusted or removed.
In order to facilitate maintenance and replacement, shut-off valves are required to be installed in front of the safety valves. These valves must be open and sealed with lead to avoid loss of safety protection; In the process of operation, due to overpressure or after the safety valve starts, it needs to be re-tested to ensure the function of the safety valve; when verifying and maintaining the safety valve, cleaning and grinding are sometimes required. Then carry out the air tightness test. The test pressure is 1.05 to 1.1 times the working pressure of the safety valve. The safety valve that has passed the air tightness test is calibrated and adjusted to the specified opening pressure and sealed with lead; the pressure gauge used for adjustment and re-inspection The accuracy is not lower than level 1; for example, the high-pressure safety valve on the ammonia compressor should open automatically when the pressure difference between the suction and exhaust sides reaches 15.7*105Pa. For two-stage compression, the pressure difference reaches 5.9*105Pa When the pressure reaches 18.1*105Pa, it should be able to open automatically to protect the ammonia compressor; the safety valve on the high-pressure equipment such as condenser and ammonia storage device should be able to open automatically when the pressure reaches 18.1*105Pa; in the intercooler, the low-pressure circulating barrel , the safety valve on the low-pressure ammonia storage device and other equipment, when the pressure reaches 12.3*105Pa, the safety valve should be able to open automatically. The most important point of setting a safety valve on the equipment is that it must have sufficient exhaust capacity when it reaches the opening pressure. Therefore, it is required that the safety valve delivered from the factory should pass the rated displacement test, and the airflow resistance of the safety exhaust system should be as low as possible. Small and unobstructed to ensure the rapid discharge of the overpressure part of the refrigerant. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for dust-free workshops and dust-free workshops.
In the ammonia pump circuit and intercooler of the refrigeration system, the widely used automatic bypass valve is a specific form of spring-type safety valve, which also plays a role in safety protection. When the pressure exceeds the set value, the valve will Automatically open, play the role of bypass voltage reduction. For the pressure safety protection of the refrigeration system, in addition to safety valves, pressure gauges with electric signals and emergency shutdown devices, safety equipment such as pressure relays and differential pressure relays are also used to achieve high-pressure, medium-pressure and low-pressure protection of compressors, oil pressure protection, and water cut-off protection for refrigeration equipment. The unit using the low-pressure pressure relay should cooperate with the temperature-sensing control valve to fully play its role; the medium-pressure protection is the safety protection of the discharge pressure of the low-pressure stage in the two-stage compression, and its purpose is similar to the high-pressure protection of the single-stage compression. When the discharge pressure of the low-pressure stage exceeds the specified value, the pressure relay will immediately act to cut off the power supply and stop the compressor. All single-stage two-stage compressors must be equipped with medium-voltage protection. The protection can use the high pressure relay of the low pressure stage compressor, but its pressure should be adjusted to the safety protection setting value of the medium pressure. For the refrigeration system of medium and small Freon refrigerants, generally no safety valve is set, and only high and low pressure relays are used as safety protection equipment.
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