Clean laboratory ventilation system control
Clean laboratory ventilation system control
The exhaust air of the fume hood adopts the TEL variable air volume control system, and the two-way control method, that is, the displacement detection and the upper wind speed detection control the surface wind speed of the fume hood, and the double sensing method of the displacement detection and the upper wind speed detection is used to control the surface wind speed of the fume hood. Control; first by displacement sensor...
Text label: clean pharma machinery ventilation system, ventilation system control
Clean pharma machinery ventilation system control
The exhaust air of the fume hood adopts the TEL variable air volume control system, and the two-way control method, that is, the displacement detection and the upper wind speed detection control the surface wind speed of the fume hood, and the double sensing method of the displacement detection and the upper wind speed detection is used to control the surface wind speed of the fume hood. Control; first, the change in the opening of the fume hood adjustment window is detected by the displacement sensor, and the butterfly valve is controlled to the appropriate opening within 1 second. When the adjustment position remains unchanged, the surface wind speed sensor measures the surface wind speed of the fume hood, and performs precise fine-tuning. ; The surface wind speed sensor detects the surface wind speed of the fume hood in real time. The surface wind speed is too high or too low, and it will give an alarm in time. When an abnormal situation occurs, the emergency discharge mode control system will open all the air valves, and the maximum air volume that may be discharged in the air exhaust system , not controlled by the face wind speed value.
Room negative pressure residual air volume control method: each fume hood variable air volume monitor feeds back the current exhaust air volume, and transmits the signal to the supplementary air control unit in the room to calculate the total exhaust air volume, which is controlled by the supplementary air The unit compares the total amount of air supply and exhaust in the room, and changes the set air volume of the air volume valve according to the comparison result, so that the supply air follows the exhaust air according to a certain difference, so as to maintain the set pressure state in the room. The following status parameters can be sent to the BAS system: exhaust air volume of each fume hood in the room; room negative pressure state value; room supply and exhaust air volume; room door position state value; room set residual air volume; controller room monitoring state. Through the differential pressure sensor, the state value of the negative pressure in the room is monitored in real time. Control the negative pressure in the room. The constant static pressure control method is used to control the frequency conversion operation of the exhaust fan unit. According to the fan power characteristics, when the air volume increases or decreases, the static pressure of the fan pipeline decreases or increases accordingly. Therefore, a pipeline static pressure sensor is installed on the main exhaust pipe of the fan. , Through the controller and the frequency converter to adjust the fan speed and maintain the static pressure of the pipeline, so as to adjust the system to run in the original static pressure state. When the air volume of the system is reduced, the purpose of frequency conversion and energy saving can be achieved. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean laboratories and dust-free laboratories.
The fresh air fan is controlled by frequency conversion, and the start, stop and speed are controlled by the frequency converter. The control target of the speed control loop is the static pressure difference at the end of each subsystem, so that the front and rear pressure difference of the butterfly valve in the fresh air system can be kept within its normal working range. Inside, the control adopts PID control mode, the set target value is determined on site, and the initial speed is determined on site. The differential pressure switch is used to detect the running state of the fresh air fan, and the hot and cold water valves take their position feedback signals. The system compares the command signal with the feedback signal. The following status parameters can be sent to the BAS system: room fresh air temperature status value, primary filter alarm, intermediate effect filter alarm, antifreeze protection status, fresh air switch valve status, pipeline temperature and humidity status value, cold water control valve valve position, humidification valve Status, operating status of the blower, working frequency of the inverter of the blower, static pressure of the blower duct, running status of the exhaust fan, working frequency of the blower, fault of the inverter of the blower, and static pressure of the exhaust duct.
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