實驗室通風系統(tǒng)是整個實驗室設(shè)計和建設(shè)過程中，規(guī)模最大、影響最廣泛的系統(tǒng)之一。通風系統(tǒng)的完善與否，直接對實驗室環(huán)境、實驗人員的身體健康、實驗設(shè)備的運行維護等方面產(chǎn)生重要影響。實驗室過度負壓，通風柜氣體泄漏，實驗室噪音等問題，一直是困擾實驗室工作人員的難題。這些問題給長期在實驗室中工作的人員，甚至工作在實驗室周圍的管理和后勤人員，造成了身體和心理上的嚴重傷害。一個科學、合理的通風系統(tǒng)要求通風效果好、噪音低、操作簡便、節(jié)約能源，甚至要求室內(nèi)壓差和溫濕度都能保持人體的舒適性。
設(shè)計原則
1、根據(jù)大樓的結(jié)構(gòu)特點，就近開設(shè)風井，劃分排風和補風系統(tǒng)，管道系統(tǒng)做到“短、平、順、直”，減小系統(tǒng)阻力，降低系統(tǒng)噪聲
2、排風和補風系統(tǒng)達到風量平衡，保持室內(nèi)-5Pa—-10Pa的負壓，防止有害氣體的散溢，保證實驗人員的身心健康;
3、夏天補冷風、冬天補暖風保證室內(nèi)溫濕度的舒適性;
4、采用智能變頻控制系統(tǒng)，達到操作方便、節(jié)能降噪的目的;
5、綜合考慮各項因素，采用投資少、運行穩(wěn)定、運行費用低、運行效果好的成熟工藝;
6、所選擇的工藝必須滿足現(xiàn)場條件，平面布置簡潔、緊湊、少占地，并方便生產(chǎn)操作和維護維修;
7、非標設(shè)備應(yīng)符合國家或行業(yè)相關(guān)規(guī)范，并保證性能穩(wěn)定、外表美觀;
8、在設(shè)計中充分考慮噪聲、臭味等，防止二次污染的產(chǎn)生，不給周圍環(huán)境造成新的污染;
9、處理設(shè)施具備沖擊負荷能力，確保廢氣達標排放。
設(shè)計參數(shù)
1、支管路內(nèi)風速6～8m/s, 干管路內(nèi)風速8～14m/s;
2、通風設(shè)備設(shè)計風量：通風柜面風速：0.3～0.8 m/s;單臺1200*800*2350通風柜設(shè)計風量1500m3/h; 單臺1500*800*2350通風柜設(shè)計風量1800m3/h;單臺1800*800*2350通風柜設(shè)計風量2200m3/h; 萬向抽氣罩面風速：≥0.35 m/s，萬向抽氣罩排風量150～350m3/h，原子吸收罩面風速：≥0.35 m/s，排風量350～600 m3/h。
3、換氣次數(shù)：一般化學實驗室的換氣數(shù)：8～12次/小時
4、通風系統(tǒng)使用終端噪聲≤62db。
5、風機采用耐腐蝕玻璃鋼離心風機，系統(tǒng)采用變頻控制，以達到節(jié)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.
