Laboratory ventilation system renovation

1Design of Laboratory Ventilation System RenovationPrinciples and installation specifications

1. Laboratory fume hood is a commonly used laboratory equipment. We know that the function of a fume hood is to maintain ventilation, so it has a certain exhaust system. Next, we will briefly explain the design principles and installation specifications of the laboratory fume hood exhaust system.

2Laboratory ventilation system renovationIt can be divided into centralized and decentralized. Concentration refers to dividing one or several floors of fume hoods into one system, or dividing the entire laboratory building into one or two systems. Its characteristics are a small number of fume hoods, low investment equipment, slight increase or decrease in the number of fume hoods, and a certain adaptability to changes in location. However, due to the large volume of the system, the air volume is not easily balanced. Although each fume hood is equipped with a regulating valve, it is not convenient to use and it is not easy to achieve the expected effect. If the system air duct is damaged and needs repair, the ventilation cabinet of the entire system cannot be used. Therefore, the laboratory initially adopted a centralized system. We are turning to distributed systems one by one.

3. A decentralized ventilation system consists of one fume hood or multiple fume hoods in the same room. Its characteristic is that the ventilation fan can be opened and closed according to the working requirements of the fume hood, without interfering with each other, and it is easy to achieve the predetermined effect, which is more energy-efficient than centralized ventilation. Due to the small size of the system, low exhaust volume, low resistance, low air volume and pressure of the fume hood, and relatively low noise and vibration. Another characteristic of dispersibility is that it is easy to handle harmful gases of different properties. The disadvantage is the number of fans and systems. If the fans are concentrated in the ventilation room, the investment will increase. If the wind turbines are installed locally, although the investment in wind turbines increases, the saved duct investment may not necessarily increase in the end.

4. When dividing the system, if there are two or more fume hoods in the same room, they should be divided into one system to avoid backflow from other fume hoods when using one fume hood.

2、 Performance characteristics of fume hood products

If the layout of the fume hood and fresh air outlet is reasonable, it is equivalent to purifying the old indoor air into the exhaust hood for cleaning effect. And there are relevant national standards for the air volume, wind speed, etc. of the fume hood. Let's take a look together.

1. The surface wind speed of the fume hood should be evenly distributed, and the deviation between its maximum and minimum values and the arithmetic mean should be less than 15%. The average surface wind speed of the operating port is 0.4-05 m/s; The exhaust volume varies depending on the type of fume hood, with a standard range from 1400m ³/h to 3800m ³/h; The range of supplementary air volume is 900m ³/h-2600m ³/h (varies depending on the model); Control the concentration to be less than or equal to 0.5mL/m ³; Resistance is less than or equal to 70.

2. The concentration controlled by the fume hood should be less than 0.5 mL/m3.

3. The resistance of the exhaust cabinet should be less than 70 Pa.

4. The allowable deviation of the external dimensions of the exhaust cabinet is within plus or minus 3 millimeters.

5. The allowable deviation for the effective height inside the exhaust cabinet is+3 mn.

6. The paint quality of the exhaust cabinet should have color harmony, durability, strong adhesion of the paint film, and should be flat. There should be no defects such as air pockets, flow marks, wrinkles, etc.

7. The operating door of the exhaust cabinet should be easy to start, unobstructed, and able to stay at any position within the travel range.

8. The workbench of the exhaust cabinet should slope towards the water tank.

9. The exhaust cabinet should be equipped with lighting equipment, fan switches, power sockets, indicator lights, water supply and drainage devices, and have openings for gas supply pipelines.

10. The insulation resistance between the charged body and the exposed metal is greater than 2MQ, and there is no breakdown or flashover for 1 minute under a test voltage of 1500V.

11. The exhaust cabinet is made of composite materials such as fiberglass, thin steel plate, stainless steel, and other corrosion-resistant models, and the selection of materials is relatively strict.

12. The oxygen index of fiberglass components should be greater than 27.

13. The surface of the exhaust cabinet that comes into contact with corrosive media should be made of materials that are resistant to acid, alkali, and high temperature.

14. The appearance quality of the exhaust cabinet should comply with relevant national standards.

15. When the power supply voltage deviation is within plus or minus 10%, the exhaust cabinet should be able to start normally.

16. The standard components of the exhaust cabinet, both outsourced and purchased, shall comply with relevant regulations and be accompanied by a certificate of conformity.

3、 Common material specifications for fume hoods

1. Overall structure: upper and lower split all steel structure;

2. Functional column: 1.0mm high-quality cold-rolled steel special profile, 45 degree air guide surface design, detachable maintenance ventilation cabinet glass door;

3. Cabinet side panel/front decorative panel: 1.2mm high-quality cold-rolled steel plate is bent, stamped, and welded together;

Body forming; Front trim panel with airflow bypass function;

4. Inner lining/guide plate: 5mm anti double special plate;

5. Panel: Laboratory specific 12.7mm solid core physical and chemical board; Homogeneous double-layer thickened trimming treatment, with a total thickness of 25.4mm. Antibacterial; Resistant to strong impact, without deformation or warping; Resistant to high temperature radiation above 120 degrees Celsius; Resistant to scratching, abrasion, strong acid and alkali, and organic solvents;

6. Window: 5mm transparent tempered glass;

7. Window handle: 2mm aluminum alloy mold forming group and integrated handle, streamlined curved surface design, in line with aerodynamic principles, reducing air turbulence at the air inlet;

8. Glass door frame: 2mm aluminum alloy mold formed composite door frame, connected with steel connectors;

9. Lighting: 30W fluorescent lamp group, lighting not less than 300LUX;

10. Gas collection hood: 500mm-400mm all steel integrated welding forming;

11. Cup slot: Integrated molding of high-density PP material mold;

12. Remote control faucet: experimental wall mounted 45 º remote control faucet; Copper water spout and remote control water valve, epoxy resin surface treatment; Ceramic valve core, 90 º rotation; High density PP switch knob;

13. Exhaust pipe: PVC exhaust square or round pipe;

14. Socket: a laboratory specific universal socket that can be used with plugs for any instrument;

15. Lower cabinet: 1.0 high-quality cold-rolled steel cabinet panel; Steel double-layer hollow reinforced structure soundproof door panel.

Zhuhai Keyipu is a professional manufacturer with over 16 years of laboratory experience

Core business: Solutions and implementation of ventilation, clean systems, and their control technologies.

Core products: exhaust hood series, ventilation hood series, ventilated storage equipment series, constant air volume control system, variable air volume control system, clean equipment series.

Main business: Solutions and implementation of laboratory decoration, laboratory furniture systems, and their water, electricity, and gas configurations.

Main products: (all steel/steel wood/aluminum wood) central platform, side platform, instrument platform, sky platform, high temperature platform, washing tank, medicine cabinet, reagent cabinet, instrument cabinet, vessel cabinet, gas cylinder cabinet, specimen cabinet, etc.

Supporting services:

1. Laboratory decoration project

2. Laboratory clean decoration project

3. Centralized gas supply system and equipment

4. Purified water system and equipment

5. Experimental equipment

6. Experimental instruments

Professional technical consultation

1. Provide professional, reasonable, and feasible laboratory solution consulting based on the characteristics of the laboratory environment and customer needs.

2. Provide rational opinions or suggestions on laboratory functional requirements analysis, instrument and equipment matching, decoration materials, etc., and effectively develop laboratory design plans.

3. Provide professional consultation on laboratory specialized sub technologies, such as laboratory environmental purification, laboratory electrical appliances, wastewater and exhaust gas, etc.

Reasonable planning and design

1. Tailored reasonable and feasible laboratory solutions for customers based on the laboratory design concept of "health, safety, environmental protection, and applicability".

2. While meeting customers' existing needs and special functional requirements for the laboratory, fully consider the space for future development needs of the laboratory.

3. Humanized layout of laboratory indoor and outdoor environment, providing laboratory staff with an efficient workplace and comfortable leisure space to the greatest extent possible.

Rich product support

1. Koyipu has a production base and complete supporting facilities for various laboratory products.

2. Integrated with specialized interior decoration materials such as laboratory floors, walls, ceilings, and other pre-set pipelines and wiring.

3. Provided by professional laboratory accessory manufacturers, there are multiple brands to choose from.

Excellent construction techniques

1. On site laboratory construction or guidance is carried out by a group of professionally trained engineers and engineering technicians with considerable work experience.

2. Strictly follow national standards, construction techniques, and construction schedule to ensure construction quality and progress.

3. Ensure that the unit engineering and concealed engineering are verified as qualified in one go, and each stage of the project is completed until the customer is satisfied. Our goal and purpose is to provide excellent laboratory design solutions and after-sales service.

*After sales service

1. The company has a customer service system, and after the project is completed and accepted, professional personnel will provide technical training to customers.

2. After sales personnel regularly arrange technical personnel to conduct safety inspections, maintenance and management of completed projects, and promptly solve problems.

3. The company accepts customer repair reports and related consultations 24 hours a day, and promptly arranges solutions to any problems that arise.