How to design the ventilation system for the remodeling of a chemistry laboratory?

There are many aspects that need to be paid attention to in the design of the ventilation system of the chemical laboratory, and today the experts of Senlappur Laboratory will share their experience with you.

1. Choose a suitable laboratory fume hood.

2. Laboratory airflow organization, supply and exhaust control valve setting.

3. Reasonably determine the maximum air volume of the laboratory air supply and exhaust system.

4. Selection of control valves and control systems for laboratory air supply and exhaust systems.

5. The main means of energy saving of the laboratory air conditioning air supply system is to minimize the exhaust air volume and reduce the air supply volume of the air conditioner accordingly under the premise of ensuring the safety of the laboratory.

6. The air duct of the laboratory exhaust system should be made of PP pipe or plastic pipe and other anti-corrosion air duct.

In the design of the ventilation system reconstructed by the XICO-Chemical Society, the route of the exhaust equipment and the calculation of the exhaust volume of the fan motor are important aspects that affect the future use of the ventilation system, and special attention should be paid to:

1.For buildings under construction, provide the architect with a plannable duct route to discuss the establishment of a pipe well or a reservation hole in advance.

2.For the construction site that has been completed and has not been occupied or has been used for many years, first confirm whether the building itself has the design of the pipe well, and if so, it can be connected to the pipe well. On the contrary, the path of the ideal exhaust line can be found according to the distance and topography of the site, and then the control method can be confirmed, and the exhaust volume and wind speed of the fan can be calculated.

How a laboratory ventilation system should be designed: subscription.

There are many systems involved in laboratory design, including ventilation, water supply and drainage, water and electricity, cleaning and other systems. For different systems, there are great differences in design depending on the type of laboratory. The following SLD laboratory technology introduces the laboratory ventilation design for you.

Laboratory ventilation should be considered in the early stages of laboratory design. How to go through the exhaust duct, how to place the fume hood, what kind of fume hood to choose, etc. So what else must be paid attention to in laboratory ventilation design, SLD will analyze the general regulations of laboratory ventilation design for you.

1.Set the conditions and principles of ventilation.

The purpose of laboratory building ventilation is to prevent a large amount of heat, steam or harmful substances from being emitted to the personnel activity area, and to prevent the pollution and damage of harmful substances to the environment and buildings. The control of waste heat and humidity and harmful substances in Datongye should be based on prevention, and it can only be achieved by the coordination and cooperation of various professions. When ventilation treatment of waste heat and humidity can meet the requirements, ventilation measures should be preferred, which can greatly reduce the energy consumption of air treatment.

2.Requirements for the discharge of hazardous substances.

Some buildings, such as scientific research and teaching laboratories, laboratory equipment rooms, etc., will emit a large amount of heat, steam, dust and even toxic gases in the process of use and storage, and such as the kitchen of catering buildings, which will contain a lot of oil smoke in the exhaust, if no treatment measures are taken, it will directly endanger the health of the operating staff, and will also pollute the natural environment around the building, affecting the health of surrounding residents or office workers. Therefore, it is necessary to adopt comprehensive and effective prevention, treatment and control measures. The standards and treatment measures for the elimination of oily fume in catering buildings should comply with the regulations on oily fume emission in the catering industry.

3.Choice of ventilation method.

Considering the requirements of energy saving, natural ventilation mainly changes the building form reasonably and moderately, and uses thermal pressure and wind pressure to form an organized airflow to meet indoor requirements and reduce ventilation energy consumption. In the design of the laboratory, the use of natural ventilation should be fully considered to meet the indoor requirements and reduce the energy consumption of ventilation. The use of natural ventilation should be fully considered in the design.

In summer, natural ventilation should be used as much as possible; In winter, natural ventilation should also be considered when outdoor air enters the room directly without fogging and condensation on the internal surfaces of the maintenance structure. When using natural ventilation, the constraints of local outdoor meteorological parameters should be taken into account.

1. The experimental operation of the chemical laboratory is generally carried out in the form of experimental reactions on the experimental bench, which creates favorable conditions for the implementation of the local ventilation system: it is directly captured at the local location where the harmful substances are generated, and discharged to the outside after purification treatment. Therefore, the ventilation design of the chemistry laboratory should be based on the local exhaust system, and the tour should not be fully ventilated.

2. Laboratory ventilation should also consider the design of air supply. In the past, there was often a tendency to "re-exhaust the air and light the air supply". However, from the perspective of air balance, poor air supply will eventually lead to poor exhaust air.

In the case that the exhaust air volume is not large, the use of door and window gap ventilation fashion can meet the requirements of the required air supply; However, in some laboratories with a large number of fume hoods, if the air inlet path is still not considered, the end result will increase the resistance of the exhaust air system, resulting in insufficient exhaust air volume.

Provide a safe and comfortable working environment and reduce the possibility of personnel being exposed to hazardous air. Ventilation mainly solves the problem of the working environment on the health and labor protection of the experimenters.

The fresh air comes all from the outside and then 100% is discharged from the outside, and the exhaust from the fume hood is not circulated indoors. The ventilation of the chemical laboratory requires more than 10 times per hour, the physical laboratory is more than 10 times per hour, and the ventilation can be reduced to 6 times when the laboratory is unoccupied. Laboratory fume hoods should be designed to be sufficient in number, and should not be installed as the only indoor exhaust sails, and a local exhaust system should be installed above the instrument room or the instrument that produces hazardous substances.

There are three requirements for chemistry laboratory ventilation:

1. Laboratory ventilation requires all fresh air to come from the outdoors, and then 100% out of the outdoors, the exhaust of the fume hood is not circulated indoors, and the ventilation requirements of the chemical elimination laboratory are greater than ten times per hour, and the ventilation can be reduced to six times when the laboratory is unmanned. Laboratory fume hoods should be designed to be sufficient in number and not used as the only indoor exhaust device, with a local exhaust system above the instrument room or the instrument that produces hazardous substances.

2. Part of the fresh air in the laboratory comes from the fresh air directly sent to the laboratory by the air-conditioning system, and this part of the fresh air changes according to the change of the exhaust air volume of the laboratory; The other part of the pei is supplied through the air-conditioning system into the corridors and rooms of the non-laboratory areas, and then through the cracks in the doors of the laboratories.

3. The position of the fume hood is arranged in a place far away from air flow and large turbulence, away from the walking area and the air fresh air area, the fresh air is introduced from the side far away from the fume hood, and the air flow path is far away from the fume hood.

There are three requirements for chemistry laboratory ventilation:

1. Laboratory ventilation requires all fresh air to come from the outdoors, and then 100% of the ventilation is discharged outdoor, the exhaust of the fume hood is not circulated indoors, the ventilation of the chemical laboratory is required to be greater than ten times per hour, and the ventilation of the laboratory can be reduced to six times when there is no one in the laboratory. Laboratory fume hoods should be designed to be sufficient in number and not as the only indoor exhaust device, with a local exhaust system above the instrument room or the instrument that produces hazardous substances.

2. Part of the make-up air in the laboratory comes from the fresh air directly sent to the laboratory by the air-conditioning system, and this part of the fresh air changes according to the change of the exhaust air volume of the laboratory; The other part is fed into the corridors and rooms of the non-laboratory area through the air-conditioning system, and then through the door cracks of the laboratory.

3. The position of the fume hood is arranged in a place far away from air flow and large turbulence, away from the walking area and the air fresh air area, the fresh air is introduced from the side far away from the fume hood, and the air flow path is far away from the fume hood.

Hello, there is no empty forest sleepy ventilated spring limb laboratory said. Chemistry labs need to be ventilated.

There are two types of ventilation in the laboratory: local ventilation and full room ventilation.

Local ventilation is the nearby discharge of harmful and poor substances after they are generated, which can discharge a large number of harmful substances with less air volume, save energy and have good effect, and can improve the existing laboratory conditions.

Whole room ventilation is to ventilate the whole room, use the fresh air sent into the room to dilute the concentration of harmful gases in the room to the allowable range of health standards, and at the same time, discharge the indoor polluted air directly or after purification treatment into the outdoor atmosphere.

Chemistry Laboratory:

The chemistry laboratory is an important place to provide the conditions for chemical experiments and to conduct scientific research. There are a large number of instruments in it: iron frames, asbestos nets, alcohol lamps and other experimental tools.

It is usually equipped with a chemical cabinet, which contains commonly used chemicals, such as: copper sulfate pentahydrate (Cuso4·5H2O, i.e. bile alum), sodium hydroxide solution, limestone, hydrochloric acid, etc.