Ammonia refrigerator Fluorine refrigerator
Thread Content
Code for Design of Cold Storage Buildings GB50072-2010 9.0.2 The ventilation design of the refrigeration room shall meet the following requirements: 1 The refrigeration room must maintain good ventilation during normal operation; the volume of ventilation shall be determined through calculations, and the number of air changes per hour shall not be less than 3 times/h. When natural ventilation is insufficient, a regular exhaust system should be installed. 2 The fluorine refrigeration machine room shall be equipped with an emergency exhaust system, and the exhaust and ventilation rate shall be no less than 12 times per hour. The distance from the top edge of the accident exhaust outlet in the fluorine refrigeration room to the indoor floor level should not exceed 1.2 m. 3 The ammonia refrigeration plant shall be equipped with an emergency exhaust system. The volume of air to be exhausted in emergency situations should be calculated at 183 m3/(m2•h), and the minimum exhaust volume must not be less than 34,000 m3/h. The accident exhaust fans in ammonia refrigeration rooms must be of explosion-proof type, and the exhaust outlets should be located high on the side walls or on the roof. Question: 1. Should an ammonia concentration detector and alarm be installed in the ammonia refrigeration plant, linked to an emergency fan? According to the \"Design Code for Detection and Alarm of Flammable and Toxic Gases in Petrochemical Industries\" GB_50493-2009, \"4.2.2 The distance between a toxic gas detector and its source of emission should not exceed 1 m.\" ”As per the requirements, many ammonia detectors need to be installed in the machine room. Is it set up this way? 2. Similar to the ammonia detector, a toxic gas detector is also installed; is the detection range of these detectors the same?
Under normal circumstances, natural ventilation hardly meets the requirements; as per standard procedures, the emergency exhaust system should remain open at all times to ensure the required number of air changes. The detector is set according to those requirements. The ammonia concentration detection alarm has nothing to do with the emergency fans; the ammonia detector is simply used to monitor whether the ammonia concentration in the operation room exceeds the allowed limits. Generally, once the alarm goes off, the amount of leakage is already higher than normal. The same principle applies when the installation distance is less than 1.2 meters – the goal is to detect any potential safety hazards as soon as they occur, rather than waiting until the leakage reaches a certain level before detecting it. Ventilation volume means: preventing the accumulation of hazardous gases from causing danger. of two concepts