实验室通风系统是整个实验室设计和建设过程中，规模最大、影响最广泛的系统之一。通风系统的完善与否，直接对实验室环境、实验人员的身体健康、实验设备的运行维护等方面产生重要影响。实验室过度负压，通风柜气体泄漏，实验室噪音等问题，一直是困扰实验室工作人员的难题。这些问题给长期在实验室中工作的人员，甚至工作在实验室周围的管理和后勤人员，造成了身体和心理上的严重伤害。一个科学、合理的通风系统要求通风效果好、噪音低、操作简便、节约能源，甚至要求室内压差和温湿度都能保持人体的舒适性。
设计原则
1、根据大楼的结构特点，就近开设风井，划分排风和补风系统，管道系统做到“短、平、顺、直”，减小系统阻力，降低系统噪声
2、排风和补风系统达到风量平衡，保持室内-5Pa—-10Pa的负压，防止有害气体的散溢，保证实验人员的身心健康;
3、夏天补冷风、冬天补暖风保证室内温湿度的舒适性;
4、采用智能变频控制系统，达到操作方便、节能降噪的目的;
5、综合考虑各项因素，采用投资少、运行稳定、运行费用低、运行效果好的成熟工艺;
6、所选择的工艺必须满足现场条件，平面布置简洁、紧凑、少占地，并方便生产操作和维护维修;
7、非标设备应符合国家或行业相关规范，并保证性能稳定、外表美观;
8、在设计中充分考虑噪声、臭味等，防止二次污染的产生，不给周围环境造成新的污染;
9、处理设施具备冲击负荷能力，确保废气达标排放。
设计参数
1、支管路内风速6～8m/s, 干管路内风速8～14m/s;
2、通风设备设计风量：通风柜面风速：0.3～0.8 m/s;单台1200*800*2350通风柜设计风量1500m3/h; 单台1500*800*2350通风柜设计风量1800m3/h;单台1800*800*2350通风柜设计风量2200m3/h; 万向抽气罩面风速：≥0.35 m/s，万向抽气罩排风量150～350m3/h，原子吸收罩面风速：≥0.35 m/s，排风量350～600 m3/h。
3、换气次数：一般化学实验室的换气数：8～12次/小时
4、通风系统使用终端噪声≤62db。
5、风机采用耐腐蚀玻璃钢离心风机，系统采用变频控制，以达到节能和降噪的目的。
Laboratory ventilation system is one of the largest and most influential systems in the whole process of laboratory design and construction. Whether the ventilation system is perfect or not has an important influence on the laboratory environment, the health of laboratory staff and the operation and maintenance of laboratory equipment. The problems of over negative pressure, gas leakage from fume hood and noise in laboratory have been a difficult problem for laboratory workers. These problems cause serious physical and psychological harm to the personnel who work in the laboratory for a long time, even the management and logistics personnel who work around the laboratory. A scientific and reasonable ventilation system requires good ventilation effect, low noise, simple operation, energy saving, even indoor pressure difference and temperature and humidity can maintain human comfort. Design Principle 1, according to the structural characteristics of the building, open the air shaft nearby, divide the ventilation and make-up air system, pipe system to be short, flat, smooth, straight, reduce system resistance, reduce, system noise; 2. The ventilation system can balance the air volume, keep the negative pressure of INDOOR-5PA -- 10pa, prevent the harmful gas from spilling out, and ensure the health of the experimenter. 3. The cold air in summer and warm air in winter can ensure the comfort of indoor temperature and humidity 4. Adopting intelligent frequency conversion control system to achieve the goal of easy operation, energy saving and noise reduction. 5. Taking all factors into consideration, adopting mature technology with less investment, stable operation, low operation cost and good operation effect; 6, the chosen process must meet the site conditions, flat layout concise, compact, less land, and convenient production operation and maintenance, 7, non-standard equipment should meet the relevant national or industry norms 8, in the design of full consideration of noise, odor, etc. , to prevent the secondary pollution, not to create new pollution to the surrounding environment; 9, treatment facilities with impact load capacity, to ensure that the exhaust gases meet the emission standards. Design Parameters 1. Wind speed in branch pipe is 6 ~ 8 M / S, wind speed in main pipe is 8 ~ 14 m / S. 2. VENTILATION EQUIPMENT DESIGN WIND SPEED: VENTILATION CABINET SURFACE WIND SPEED: 0.3 ~ 0.8 m / s; single 1200 * 800 * 2350 ventilation cabinet design wind capacity: 1500 m 3 / H; The design air flow rate of single 1500 * 800 * 2350 fume hood is 1800 M3 / h, the design air flow rate of single 1800 * 800 * 2350 fume hood is 2200 M3 / h, the air flow rate of the Universal Exhaust Hood is ≥0.35 m / s, the air flow rate of the universal exhaust hood is 150 ~ 350 M3 / h, the air flow rate of the Atomic Absorption Hood is ≥0.35 m / S, exhaust Air Volume 350 ~ 600m 3 / h. 3. Ventilation Frequency: GENERAL CHEMICAL LABORATORY VENTILATION NUMBER: 8 ~ 12 times / Hour 4, ventilation system using terminal noise ≤62 DB. 5. The Centrifugal Fan is made of corrosion-resistant glass fiber reinforced plastic, and the system is controlled by frequency conversion to save energy and reduce noise.
