Centralized ventilation module system

Laboratory ventilation systemIt is one of the large-scale and widely influential systems in the entire laboratory design and construction process.Laboratory ventilation systemThe completeness of the laboratory directly affects the laboratory environment, the physical health of laboratory personnel, and the operation and maintenance of experimental equipment

Excessive negative pressure in the laboratory, gas leakage from the fume hood, and laboratory noise have always been problems that plague laboratory staff. These issues have caused serious physical and psychological harm to personnel who have been working in the laboratory for a long time, and even to management and logistics personnel working around the laboratory.
A scientific and reasonable ventilation system requires good ventilation effect, low noise, easy operation, energy conservation, and even requires indoor pressure difference and temperature and humidity to maintain human comfort.

Design standards
　　1Quality Inspection and Evaluation Standards for Ventilation and Air Conditioning Engineering (GB)J304-2002）。　
　　2Code for Construction and Acceptance of Low Voltage Electrical Equipment Installation Engineering (GB50254-96)　
　　3. Concise Ventilation Design Manual (GB50194-2002).

　　4. Code for Construction and Acceptance of Compressor, Fan, and Pump Installation Engineering (JBJ29-2002).

　　5Code for Fire Protection Design of Buildings (GB50016-2006).　
　　6. Comprehensive Emission Standards for Air Pollutants (GB16297-1996).
　　7. Environmental Air Quality Standards (GB3095-1996).
　　8. Standard for Environmental Noise in Urban Areas (GB3096-93).
　　9Design Code for Heating, Ventilation and Air Conditioning (GBJ19-87-2003).
　　10. Design Standard for Energy Efficiency of Public Buildings (GB50189-2005).
　　11. Relevant information of our company and the information provided by Party A.

Design Principles

1. According to the structural characteristics of the building, nearby air shafts should be set up, and exhaust and makeup air systems should be divided. The pipeline system should be "short, flat, smooth, and straight" to reduce system resistance and noise
　　2. The exhaust and makeup air systems achieve air volume balance, maintain a negative pressure of -5Pa to -10Pa indoors, prevent the spread of harmful gases, and ensure the physical and mental health of experimental personnel;
　　3. Supplement cold air in summer and warm air in winter to ensure comfortable indoor temperature and humidity;
　　4Non standard equipment should comply with relevant national or industry regulations, and ensure stable performance and beautiful appearance;　
　　5. Taking into account various factors, mature processes with low investment, stable operation, low operating costs, and good operating effects are adopted;
　　6. The selected process must meet the on-site conditions, with a simple and compact layout, minimal land occupation, and convenient production operation and maintenance;
　　7Adopting an intelligent frequency conversion control system to achieve the goals of easy operation, energy saving, and noise reduction;　
　　8. Fully consider noise, odors, etc. in the design to prevent secondary pollution and avoid causing new pollution to the surrounding environment;
　　9. The treatment facilities have the ability to withstand impact loads and ensure that the exhaust emissions meet the standards.

Parameter Description　　
　　1. The wind speed in the branch pipeline is 6-8m/s, and the wind speed in the main pipeline is super 8-14m/s;
　　2. Ventilation equipment design air volume:
Ventilation cabinet face wind speed:0.3～0.8 m/s， The design air volume of a single 1200 * 800 * 2350 fume hood is 1500m3/h, the design air volume of a single 1500 * 800 * 2350 fume hood is 1800m3/h, the design air volume of a single 1800 * 800 * 2350 fume hood is 2200m3/h, the wind speed of the universal exhaust hood surface is ≥ 0.35 m/s, the exhaust air volume of the universal exhaust hood is 150-350 m3/h, the wind speed of the atomic absorption hood surface is ≥ 0.35 m/s, and the exhaust air volume is 350-600 m3/h.
　　3. Ventilation rate:Ventilation rate in general chemical laboratories:8-12 times/hour
　　4. The terminal noise of the ventilation system should be ≤ 62db
　　5. The fan adopts corrosion-resistant fiberglass centrifugal fan, and the system adopts frequency conversion control to achieve energy saving and noise reduction.

Centralized ventilation system

The intelligent centralized control system mainly includes four modules: equipment operation management, environmental safety supervision, experimental process status monitoring, and real-time emergency event sending, covering the laboratoryThe real-time information function of "personnel environment equipment" is a "collection of information" for safety supervision. The system can simultaneously monitor the "alarm" function of ventilation cabinets, room negative pressure systems, exhaust systems, fresh air conditioning systems, centralized gas supply systems, environmental protection equipment, etc. in real-time 24 hours a day, record and send information in a timely manner for equipment operation failures and emergencies, standardize the workflow of equipment management, etc. After the project is completed, it will strengthen the warning of unsafe risks and emergency response to emergencies, improve the ability of laboratory safety supervision and timely handling of emergencies.

A typical laboratory building consists of multiple floors and rooms, equipped with a large number of fume hoods. The rooms are controlled for positive or negative pressure according to their use, and the air supply is provided by a brand new air conditioning system with a supporting exhaust system.

The equipment in the experimental building is scattered on various floors and corners. If decentralized management is adopted, on-site monitoring and operation will occupy a large amount of human resources, and sometimes it is almost difficult to achieve. But by adopting intelligent management systems for buildings and laboratories, utilizing modern computer technology and network systems, centralized management and automatic monitoring of all mechanical and electrical equipment can be achieved, ensuring the safe operation of all mechanical and electrical equipment while improving the comfort and work efficiency of personnel in the building.

The construction of the system needs to fully reflect the professional requirements of the weak current system construction institute, such as the progressiveness of technology, the professionalism of the system, the complexity of functions, the feasibility of investment, and the practicality of construction, to ensure the smooth implementation and normal operation of the laboratory project on schedule.

Laboratory Ventilation Centralized Management System

The laboratory intelligent centralized control system mainly includes four modules: equipment operation management, environmental safety supervision, experimental process status monitoring, real-time recording and sending of emergency events. The system simultaneously controls the ventilation cabinet, room air volume difference system, room negative pressure system, clean area system, exhaust system, fresh air conditioning system, centralized gas supply system, environmental protection equipment, etc24-hour real-time monitoring and "SMS alarm" function, providing solutions before equipment hazards escalate into failures, timely recording and sending information on equipment operation failures and emergencies, standardizing various workflows for equipment management, etc.

The system consists of the following components:

- Data server, used for network management;

- Multi user operation workstation for touch screen displays;

- Equipped with a dedicated alarm terminal for sending alarm messages;

- SQL - Server;

- WEB - Server;

- Printer for generating graphics and reports;

- UPS uninterruptible power supply;

The network used for communication between PLC, HMI, and I/O modules; Interface to independent control system;

Ventilation system for experimental concentration room

The operation station interface should have the following functions:

Remote monitoring of fume hood, real-time display of face wind speed, temperature, window height, presence/absence status, start/stop status, lighting status, etc

Remote control of the start and stop of the fume hood, control of window lifting and lowering, switching on and off of lighting fixtures, setting of surface wind speed, upper temperature limit, safe height of windows, and other parameters

Remote monitoring of exhaust fan status, setting and displaying pipeline static pressure value, displaying fan operating frequency, filter blockage alarm

Remote monitoring of the status of the fresh air unit, setting and displaying pipeline static pressure value, water valve opening, supply air temperature, displaying fan operating frequency, and filter blockage alarm

Process simulation, color graphic display of real processes;

Trend analysis:

Automatic display of alarms and automatic sending of text messages;

Alarm management for several alarm levels (defined by user priority), with access permissions for users to set or modify alarms;

Historical data and report archiving; Perform system backup and recovery, store databases;

The operator enters the operating system through an account and password (access control);

Change setting parameters and setpoints, access and modify real-time system data charts (with permission requirements);

Preventive maintenance schedule:

Laboratory centralized ventilation systemWhat are the requirements and precautions

ASHRAE regulations stipulate that laboratory ventilation control systems should include several important aspects such as minimum air exchange rate, room pressure difference, forms of air supply and exhaust, and air supply control as important references. Let's take a comprehensive look at them.

OneZ small ventilation rate：

The "Design Specification for Heating, Ventilation and Air Conditioning Regulation in Chemical Industry" stipulates that the minimum air exchange rate in laboratory rooms is generally within6 times/h~8 times/h. ASHRAE stipulates that the overall air exchange rate in the laboratory should be determined by the total air volume discharged from local exhaust equipment or other rooms; Take away the required cooling air volume for the room's heat load; Minimum ventilation rate requirement. In use, the minimum air exchange rate in the laboratory should be maintained at 6 to 10 times per hour.

Laboratory ventilation system

Under normal circumstances>A room ventilation rate of 10 times per hour is considered appropriate. However, when there are analytical equipment in the laboratory that may generate high heat loads, or when there is a large amount of local exhaust in the room, it may be necessary to increase the ventilation volume accordingly. The wet chemical room has a fume hood and a large number of heating furnaces in the heating room. The calculation method for fume hoods is based on the "Design Code for Heating, Ventilation and Air Conditioning Regulation in Chemical Industry", which specifies the minimum suction surface velocity of 0.5m/s at the operating port of the fume hood for harmful substances with light, moderate or hazardous properties, provided that there is supplementary air supply on the indoor ceiling. For the utilization rate of fume hoods, when the number of fume hoods is greater than 2, a simultaneous utilization rate of 60% to 70% should be taken. The heating furnace calculates the required exhaust air volume based on the heat balance law that maintains the heating temperature inside the furnace. From the above, the total safe ventilation volume can be calculated. In addition, the air conditioning air volume for load calculation and the minimum air exchange rate of 10 times can be compared, and the maximum value of the three can be taken.

Internal air supply structure in the laboratory

twoRoom pressure difference

The Design Specification for Heating, Ventilation and Air Conditioning Regulation in Chemical Industry stipulates that laboratories should maintain relative negative pressure. All gases emitted from the chemistry laboratory should be directly discharged from the room, rather than being recycled. Therefore, unless the chemical laboratory also has cleaning requirements, it is necessary to maintain negative pressure relative to the adjacent area. In fact, this regulation should be implemented based on specific goals.

A constant temperature and humidity chamber requires strict temperature and humidity control range and should be designed with positive pressure. Because if negative pressure is designed, air from adjacent areas may enter, which may compromise the accuracy of temperature and humidity control; On the other hand, if contaminated air enters, it may also cause safety issues. For wet chemical chambers and heating chambers, negative pressure needs to be designed to prevent toxic, corrosive, high-temperature gases or volatile substances from escaping into the chamber or even into other areas. The office area of the laboratory building should always maintain positive pressure relative to the corridors and laboratories. The airflow in the laboratory should flow from low-risk areas to high-risk areas, and finally be discharged to the outside through various ventilation cabinets or heating equipment.

IIIForms of air supply and exhaust

The "Design Specification for Heating, Ventilation and Air Conditioning Regulation in Chemical Industry" stipulates that when the exhaust volume of the laboratory is large, an outdoor fresh air supplement system should be installed and included in the fresh air load.

Each exhaust device should be equipped with an independent exhaust system. All exhaust devices in the same laboratory should share a common exhaust system. Laboratories that continuously use exhaust systems during working hours should be equipped with a supply air system, with a supply air volume equal to the exhaust air volume70%, the air supply needs to be purified according to the process requirements. For cities with heating needs in winter, heating and air supply should be provided, and the supply airflow should not disrupt the normal operation of the laboratory exhaust system.

All gases emitted from the chemistry laboratory should be directly discharged from the room, rather than being recycled. Therefore, unless the chemical laboratory also has cleaning requirements, it is necessary to maintain negative pressure relative to the adjacent area. Whether to chooseThe 100% fresh air supply system should be an important part of laboratory risk assessment. Each unit in the laboratory is equipped with an independent exhaust system installed on the roof. Due to the generation of toxic, corrosive, and high-temperature gases, the wet chemical chamber and heating chamber must be treated with fresh air. For others, such as ordinary laboratories for computer analysis and constant temperature and humidity chambers for material testing, the fresh air supply system is notweiyiThe choice. Due to the different process functions of the laboratory, there is no need for fresh air exchange or treatment. The only option that can meet the process requirements is the first one. 100% fresh air is for the environment of the fume hood, and for general laboratory circulation air treatment, it can meet the requirements, so there is no need for 100% fresh air. In addition, in air-conditioned environments with fresh air, energy consumption is high.

4、 Control system

The ventilation control system of this laboratory should fully consider various parameter indicators such as pressure, pressure difference, ventilation volume, temperature and humidity in each room, while also paying attention to energy conservation. There are often various chemical pollution sources in the laboratory that are harmful to human health, especially harmful gases. It is very important to discharge them outdoors.

Laboratory ventilation systemThe important role is first and foremost to create a more comfortable working environment for experimental personnel while ensuring the safety of operators.

ventilation system

Product Details

exhaustLaboratory room exhaust, also known as comprehensive ventilation. It refers to a way of overall ventilation and air exchange in laboratory rooms. Equipment exhaust, also known as local ventilation, refers to controlling the ventilation range in areas where harmful substances are more concentrated, Or local ventilation methods with frequent staff activities, such as fume hoods, universal exhaust hoods, atomic absorption hoods, etc. The composition of the ventilation pipeline system includes terminal exhaust equipment, fans, ducts, air valves, mufflers, and exhaust gas treatment equipment.

Supplement windAir conditioning makeup air, natural makeup air, fresh air system, powered makeup air, non powered makeup airControl system:CAV constant air volume control system、VAV variable air volume control system.

Activated carbon adsorption box

Product Details

Product features of activated carbon adsorption box:

1. High adsorption efficiency;
2. The equipment has a beautiful structure, small footprint, easy maintenance and management, and low usage cost;
3. It can simultaneously process multiple mixed organic waste gases;

4. Adopting an automated control operation design, the operation is simple and safe.

5. Application areas: chemical, light industry, painting, electronics, electromechanical, rubber, coatings, pharmaceuticals, furniturePurification of harmful organic waste gases and elimination of odors generated by industries such as printing, home appliances, footwear, batteries, plastics, films, ships, automobiles, and petroleum can be selected.

Product Details

Acid mist spray towerAlso known as acid mist purification tower, acid mist absorption tower, acidic gas scrubbing tower, and exhaust gas purification tower, it can remove harmful gases from the air.
The principle is to use the suction force of the exhaust fan to continuously transport the exhaust gas to the spray tower, so that the exhaust gas is transported to the spray tower of the system. The gas passes through the spray washing process of the neutralizing liquid in the spray tower, and the exhaust gas containing substances such as hydrogen fluoride, chlorine gas, hydrogen sulfide, nitrogen oxides, sulfur dioxide, hydrogen chloride, various acid mist, etc. is fully mixed and neutralized by the neutralizing liquid mist. Form a good gas-liquid two-phase interaction.
After spraying, the water mist forms a porous treatment layer with a larger contact surface in the packing layer (hollow sphere) inside the washing tower, further treating the gas. After passing through the packing layer, all the water mist returns to the water tank at the bottom of the washing tower for reuse. The exhaust gas passes through the packing layer from bottom to top, and the absorbent is circulated from the top of the tower through the liquid distributorSpray evenly into the filling layer, flow downwards along the surface of the filling layer, and enter the circulating water tank Due to the continuous contact between the rising gas and the falling absorption gas in the packing, the concentration of the fluid in the rising gas stream decreases and reaches the emission requirements at the top of the tower.

PP fan

Product Details：

Rainproof hoodThe rainproof cap is similar in shape to an umbrella, consisting of a conical umbrella cap and several support rods welded together to prevent rainwater from entering the interior of the fan and pipes, providing a rainproof effect.

Motor rain coverSimple structure, easy to use, prevents the motor from being soaked by rainwater, provides safety protection, and extends its service life.

shock absorberShock absorbers can reduce the vibration of the fan floor, lower the load on the fan, and extend the service life of the fan.

impellerThe impeller is designed according to different performance specificationsComposed of 8-36 aft leaning wing shaped blades, curved front cover plates, and flat rear plates.

Work formCentrifugal fans can be made in two forms: left-handed and right-handed. When viewed from the motor side, if the impeller rotates clockwise, it is called a right-handed rotating fan; The counterclockwise rotation of the impeller is called a left rotating fan;

working principleThe working principle of a centrifugal fan is basically the same as that of a turbo compressor, both due to the low gas flow rate and small pressure changes. Generally, it is not necessary to consider changes in gas specific volume, that is, to treat gas as an incompressible fluid.

performance parametersThe performance parameters of a fan mainly include flow rate, pressure, power, efficiency, and speed. In addition, the magnitude of noise and vibration are also major design indicators for fans. Flow rate, also known as air volume, is expressed as the volume of gas flowing through a fan per unit time; Pressure, also known as wind pressure, refers to the increase in pressure of gas inside a fan, which can be divided into static pressure, total pressure, and dynamic pressure; Power refers to the input power of the fan, that is, the shaft power.

featureInsulation, cleanliness, aesthetics, low specific gravity, and strong mechanical strength.

purposeCan be widely used for laboratory pumping in chemical, metallurgical, electroplating, textile, instrumentation, scientific research institutions, etc-Toxic or corrosive gases within the temperature range of 8 degrees and 80 degrees.