Ventilation requirements and standards for diesel generator sets?

Nowadays, with the rapid development of social economy, people's material demand is getting higher and higher, and the demand for diesel generator sets is also increasing day by day, so diesel generator sets also have certain requirements for "housing" conditions. <>

1. The diesel generator set should be installed in the machine room with good ventilation, clean environment, and close to the main electrical equipment and power distribution room. The computer room should be equipped with exhaust facilities. The machine room of the closed diesel generator set generally does not need forced ventilation, and the air can be exhausted to the outside through the fan of the unit to promote the air convection in the machine room.

In the machine room of the open diesel generator set, the fan can be set up for forced ventilation if necessary. In a place far away from the unit, use a fan and a large-diameter air inlet pipe to introduce outdoor air into the machine room. The air outlet of the inlet pipe should be as low as possible, so that the introduced air can pass through the heat dissipation part of the generator set.

The exhaust fan should be installed at the inner height, so that the high-temperature updraft can be discharged outdoors in time.

2. Ventilation and dust prevention are optimally combined, and there must be enough fresh air in the machine room, otherwise dirty air will reduce the power of the diesel engine. Dust can destroy the insulation between the engine rotors and burn the generator set in serious cases. If the ventilation is good, the moisture-proof performance will inevitably be appropriately reduced.

If you think too much about dust, it will affect the ventilation of the generator room. The two seemingly contradictory aspects require the generator room designer to calculate and coordinate according to the actual situation to achieve the optimal combination.

3. The ground foundation of the computer room should grasp the thickness without a specific foundation, and it can be directly installed on the horizontal plane and the concrete ground with sufficient strength, and the general thickness should be greater than 200mm.

4. The space layout should be reasonable, and the distance between the units and the outer profile of the unit should meet the needs of handling equipment, local operation, maintenance and overhaul or arrangement of auxiliary equipment.

5. The arrangement of smoke exhaust pipes and inlet and exhaust louvers can be installed with ventilation pipes when necessary, and forced ventilation systems can be adopted. The air inlet and exhaust area of the computer room should be at least twice the heat dissipation area. The smoke exhaust ducts of the unit should be covered with insulating materials, and if permitted, the silencer and most of the smoke exhaust pipes should be installed outside the machine room as much as possible.

The effective area of the inlet and exhaust shutters shall not be less than 70%, with good flow lines and low airflow resistance, and the inside of the shutters shall be equipped with protective nets for birds, rats and pests, but shall not obstruct the flow of cooling and exhaust air; The exhaust shutter and the heat dissipation tank of the unit must be connected with a heat-resistant and oil-proof soft material.

6. Equipped with fire extinguishing device, safe and guaranteed: dry powder fire extinguisher. including hand-held and cart-style; Automatic fire extinguishing device for dry powder. The independent hanging type can be used, and when no one is on duty, it can automatically start extinguishing the fire as soon as a fire occurs.

The diesel generator set should be installed and arranged in strict accordance with the requirements of the diesel generator installation environment and the installation environment specifications of the diesel generator set, so as to keep the fuse of potential safety hazards away.

Daze Wang Gong answers!

Ventilation requirements and standards for diesel generator sets? Today, Yanan Motor will take you to find out! Ventilation of diesel generator set is an important factor that must be considered in the installation of the unit, which has a direct impact on the good operation of the unit.

Figure 3c shows the ideal orientation diagram of the unit ventilation system. The air enters the tail of the unit from the outside of the machine room, passes through the generator, diesel engine, and radiator, and then is discharged by the fan through a flexible exhaust duct. (FYI:.)

Yanan A Yanan Group: R & D and production of diesel generator sets and fuel cells).

It is necessary to make an exhaust air deflector for the unit, and the material is preferably metal. The connection between the air deflector and the radiator of the unit needs to be flexibly connected (high-temperature canvas) to isolate the transmission of vibration of the unit and ensure that the hot air is discharged more thoroughly.

The effective flow cross-sectional area in the air deflector box should be times the front area of the radiator core, and the air deflector should be smooth and less acutely curved to reduce the wind conduct. At the same time, the effective circulation area of the air inlet should also be twice the front area of the radiator core to ensure that the air in the computer room does not cause excessive negative pressure. If the user installs protective nets and blinds at the air inlet and outlet, or when the inlet and outlet are more curved, the flow resistance will increase.

Consideration should be given to further increasing the circulation area.

The intake air temperature of the engine should be below 40. If the intake air temperature is consistently higher than this value, the engine's power output will be reduced, so fresh air must be brought in from outside the engine room in time to supply the engine intake.

In general, the amount of air discharged by the fan is sufficient to meet the ventilation requirements of the equipment room. However, if the engine is equipped with a remote radiator or heat exchanger to dissipate heat, the engine room must be forced to ventilate.

1. The ventilation system of the air-cooled generator room can be summarized into four systems:

1. Usual ventilation system.

The ventilation of the generator room is generally 10 15 times of ventilation, and only the exhaust fan can be provided.

If there is gas in the water supply and drainage to extinguish the fire, the system also undertakes the exhaust system after the fire is extinguished.

2. Generator process inlet and exhaust system.

The motor itself has a large exhaust pipe, which is the generator's own, we can cooperate with a wind shaft, and at the same time design the air inlet system to supplement the exhaust air volume and the generator set combustion air volume (electrical investment), set up a blower, this system has a large air volume.

This system is also designed to be reserved for air shafts.

3. Generator exhaust gas system.

When it comes to environmental issues, often referred to as "smoke exhaust pipes", generators come with their own, and there is a special well for this system on the standard atlas of electrical engineering, but in fact, it is difficult for engineering design buildings to have so much open space. Most of them are discharged outdoors by generator exhaust shafts.

4. Exhaust system of oil storage room.

It can be used in conjunction with 1, and at this time, the branch pipe leading to the oil storage room is provided with a check valve and a fire damper; It is also possible to set up a separate system with explosion-proof ventilators.

2. The ventilation of the diesel generator room includes two parts, the usual ventilation and the working ventilation.

Usual ventilation: The machine room of air-cooled and water-cooled generators is usually ventilated for 6 times, and the oil storage room is ventilated for no less than 3 times. For the machine room with gas fire extinguishing system, after the fire, the ventilation system is responsible for the elimination of indoor exhaust gas, but not accident ventilation; In order to ensure the safety of people, it is recommended to press the accident ventilation to set the start button.

Working ventilation: water-cooled diesel generators must consider the amount of air required for working oxygen consumption; The air-cooled generator has a large cooling air volume, generally adopts natural air intake, and the diesel engine comes with fan pressure discharge, but the diesel generator comes with a fan pressure head of only about 150pa, and when the shaft resistance is large, it is necessary to increase the fan to overcome the shaft resistance, and the general air inlet shaft has a large resistance, and the fan is added; If the resistance of the exhaust shaft is large, the exhaust fan is added.

The diesel generator room uses gas to extinguish fires, and solenoid valves should be set on the inlet and exhaust channels, and when the fire gas fire extinguishing starts in the diesel generator room, these valves are closed interlockedly to ensure the fire extinguishing effect.

The smoke exhaust of diesel generator is pressure exhaust, the flue gas temperature is high, the airflow speed is high, the flue gas needs to be discharged at high altitude, the smoke pipe should be considered thermal insulation, and the shock absorption hanger needs to be set up at the same time.

When the engine is working, there is always a part of the combustible mixture and exhaust gas into the crankcase through the piston ring, and the gasoline vapor that flows into the crankcase will make the oil thinner and the performance deteriorate after condensation. The exhaust gas contains water vapor and sulfur dioxide, and the water vapor condenses in the engine oil to form foam, destroying the oil supply, which is especially serious in winter; Sulfur dioxide meets water to form sulfurous acid, and sulfurous acid meets oxygen in the air to form sulfuric acid, and the appearance of these acids not only deteriorates the oil, but also corrodes the parts. As the flammable mixture and exhaust gases flow into the crankcase, the pressure in the crankcase will increase, and the oil will seep out from the crankshaft oil seal, crankcase gasket, etc.

Oil vapor lost into the atmosphere increases the engine's pollution to the atmosphere. The engine is equipped with a crankcase ventilation device to avoid or alleviate the above phenomenon, therefore, the function of the engine crankcase ventilation device is: 1. Prevent the deterioration of lubricating oil and reduce the corrosion of friction parts.

When the engine is working, a part of the combustible mixture and exhaust gas leak into the crankcase, and the gasoline vapor leaked into the box condenses and thins the oil, deteriorates the performance, and reduces the lubrication effect. If the exhaust gas contains water vapor and sulfur gas, sulfuric acid will be formed, which will corrode the parts. 2. Depressurization, cooling and heat prevention, leakage such as gas in the crankcase increases the pressure and temperature in the box, and the oil leaks and deteriorates from the oil seal liner.

After ventilation, it has a certain cooling and depressurization and leakage prevention effect on the oil. 3. Reducing air pollution and combustible gas is conducive to improving the economy of fuel and reducing the pollution of emissions.

Ventilation is a problem that should be paid special attention to in the design of the generator set machine room, especially when the machine room is located in the basement, it must be dealt with well, otherwise it will directly affect the operation of the diesel engine generator set. (FYI: Yanan Diesel Generator Answer:

Generally, the exhaust air of the unit should be equipped with a hot air pipe, and it is not advisable to let the diesel engine radiator dissipate the heat in the engine room, and then extract it by the exhaust fan. There should be enough fresh air in the computer room. When the diesel engine is running, the air exchange volume of the engine room should be equal to or greater than the sum of the fresh air volume required for the combustion of the diesel engine and the fresh air volume required to maintain the room temperature of the engine room.

The amount of fresh air required to maintain room temperature is calculated by the following formula:

c = where c ——— the required fresh air volume (m3 s);

p——— diesel engine rated power (kw);

t——— temperature rise in the computer room ( ).

Yanan generator tips: the fresh air volume required to maintain the combustion of the diesel engine can be obtained from the unit manufacturer, if there is no information, it can be calculated according to the power per kilowatt (the diesel engine power is equipped with a multiple of the main power generation power of the generator). The ventilation of the diesel generator room generally adopts the exhaust air to set up hot air pipes, and the air inlet is a natural air intake.

The hot air pipe is connected with the diesel engine radiator, and its connection is connected with a soft joint, the hot air pipe should be straight, if you want to turn, the turning radius should be as large as possible and the inside should be smooth, and the air outlet should be as close as possible and facing the radiator. The air inlet and outlet should be arranged at both ends of the unit to avoid a short circuit in the airflow and affect the heat dissipation effect. The area of the air outlet and air inlet of the computer room shall meet the requirements of the following formula:

s1 s2.

S——— diesel engine heat dissipation area;

s1——— area of air outlet;

S2——— area of air inlet.

In cold areas, attention should be paid to the influence of air inlet and exhaust outlet on the temperature of the computer room, so as to prevent the temperature of the computer room from being too low and affecting the start of the unit. The connection between the tuyere and the outdoor can be set up with a damper, which is usually closed and can be automatically opened when the unit is running.

1. Generally speaking:

Diesel generator set is a kind of power generation equipment with diesel as the main fuel, and the diesel engine is used as the driving force to drive the generator (i.e. electric ball) to generate electricity, and convert kinetic energy into electrical energy and heat energy. The whole set of diesel generator set is mainly divided into three parts: diesel engine, generator (i.e., electric ball), controller.

2. Subdivided:

The diesel generator includes: the base, the diesel engine, the base fuel tank, the generator set (i.e., the electric ball), the controller (which plays the role of control, and also plays the role of protecting the unit), the radiator (air cooling: fan; Water cooling: water tank), silent box and other components.

According to the different needs of different places, generator sets are divided into fixed generator sets, silent generator sets and movable trailer generator sets.

Yanan generator tips: As the name suggests, the fixed generator set should not be moved after installation, and it is suitable for power in fixed places, such as chemical plants, hospitals, breeding enterprises, coal mines, etc.

The noise index of silent generator sets is much lower than that of ordinary generator sets, and it is suitable for places with strict requirements for noise index, such as hospitals, supermarkets, data centers, residential areas, etc.

Mobile generator sets, also known as trailer generator sets, can be moved freely by tractors or manual traction, and are suitable for power in unfixed places, such as large-scale coal mines, construction projects, field construction operations, etc.

3. Power calibration:

Diesel generator sets are divided into common generator sets and standby generator sets, and the power is also divided into common power and standby power.

The power of diesel generator is identified by kW (kilowatt), and the power of diesel engine is generally about 10% greater than the power of diesel generator set. The power of diesel generator is 8-2000 kilowatts, and then the high-power project, you can choose the parallel generator set project.

There are many standard configurations of the diesel tomato oil generator set, and the common ones are:

1. Suitable for the environment 40 50 radiator water tank, belt-driven cooling fan, fan safety guard;

2. Direct injection internal combustion engine (diesel);

3. Alternating current generator (single bearing);

4. Power generation output air switch, standard control screen;

5. The steel common base of the unit (including: the vibration damping rubber pad of the unit);

6. Dry air filter, fuel filter, lubricating oil filter, starting motor, and self-balancing charging generator;

7. Starting the battery and the battery starting connection cable;

8. Industrial 9db silencer and standard parts for connection.

9. Random data: diesel engine and generator original technical documents, generator set manuals, test reports, etc.

Note: The optional configuration cost of diesel generator set is charged separately, and the appropriate configuration should be selected for the unit according to the work needs!