How to choose a diesel generator set, how to choose a diesel engine for a generator set

What are the things to pay attention to when buying a diesel generator?

A question, ask about the purchase time, use and current reasons of the old diesel engine, ask about the past repairs, what main components have been replaced, and ask what problems there are in use, so as to have a more comprehensive and systematic understanding of the old diesel engine.

Second, look at the signage and appearance of the old diesel engine. Look at which factory produced it, when it left the factory, and how long it has been since now; Look at the appearance of the paint is peeling off, whether the parts are missing, whether the model is eliminated, etc. Judging the newness of the old diesel engine from the signage and appearance.

Three tests, test machine. The old diesel engine is carefully inspected by shaking the crankshaft, pulling the flywheel, starting the machine, etc. The test is a very important step, and the specific inspection steps are as follows:

1. Rotate the crankshaft to supply fuel to the fuel injector. If the fuel injector makes a crisp sound, it means that the fuel injector and plunger pair are in good performance; If there is no wheel room"Wow"and other abnormal sounds, it means that the wear of the gear is not serious.

2. Pull the flywheel up and down, if there is no sound, it means that the gap between the crankshaft spindle stem and the bearing is not large.

3 Twist the flywheel so that the piston is close to the bottom dead center, and then shake the flywheel from side to side, if there is none"Click"sound, indicating that the wear between the connecting rod shaft stem and the tile is not serious.

4. Decompress the cylinder, shake the crankshaft, when the decompression is removed, if the piston is strong, the flywheel rotates rapidly, indicating that the wear degree of the cylinder, piston and piston ring is small. When shaking the crankshaft, the pointer of the oil pressure gauge should not be less than 1 or the red mark of the oil instruction can be raised quickly, and the hand pressure should be laborious.

5 Start the machine. If it is easy to start, the smoke exhaust is colorless or light gray, and the speed is stable without noise, it means that the technical condition of the old diesel engine is good.

There are many configurations of diesel generator sets, there are standard configurations, there are optional configurations (additional billing), the configuration of generators should be selected according to the work needs of the unit, the unit needs protection functions, and so on. When the unit needs to be easy to move, choose the mobile trailer configuration, working environment and working conditions, so that the configuration of the diesel generator set can meet the work requirements. There are so many optional configurations of the unit, it is impossible to choose all of them, and when the unit needs sound insulation, it is necessary to choose the silent box configuration.

Summary. Hello, dear and happy, I am happy to answer for you The general power of diesel generator sets is 8 to 2000kw, and the diesel generator brands include Cummins generator, Perkins generator, Volvo generator, Yanan generator, Yuchai generator, Weichai generator, Shangchai generator and other brands. Generally, diesel generators include stationary generators, mobile generators, silent generators, containerized generators and other styles.

Hello, dear and happy, I am happy to answer for you The general power of diesel generator sets is 8 to 2000kw, and the diesel generator brands include Cummins generator, Perkins generator, Volvo generator, Yanan generator, Yuchai generator, Weichai generator, Shangchai generator and other brands. Generally, diesel generators include stationary generators, mobile generators, silent generators, containerized generators and other styles.

First of all, whether it is a domestic diesel generator set or an imported diesel generator set, the following main factors should be considered: (1) the use of the unit. Because the diesel generator set can be used in 3 situations, such as common, standby and emergency.

Therefore, the requirements for diesel generator sets are different for different uses. (2) Load capacity. The load capacity and load change range should be selected according to different uses, and the single capacity of the diesel generator unit and the standby diesel generator set capacity should be determined.

3) The environmental conditions of the unit (mainly referring to the altitude and climatic conditions) (4) the selection of diesel generators (5) the selection of generators and excitation modes (6) the selection of automation functions of diesel generators.

How to choose a diesel generator set manufacturer.

Diesel generator brands include: Cummins generator set, Fujian Yanan generator set, Yuchai generator set, Weichai generator set, etc.

Many people have no understanding of diesel generator sets before buying diesel generator sets, and only know that they can replace mains. I don't know anything about its production process and various configurations. At this time, the most important point is to choose the right manufacturer, because, because the generator set is a high-tech process product of modern industry, the choice of the manufacturer is quite important.

There are several main considerations for choosing a manufacturer:

First, whether it is at the average level of the same industry, you can shop around; If it's too high, it's not good, and if it's too low, it's definitely not okay. The current ** are all respectful and transparent, if the ** is too low, there must be a problem with the rotten book;

The second is the scale of the company, there is a certain scale of the factory, which is relatively reliable in terms of quality, and at the same time can understand the past sales status of the factory, and if necessary, you can ask for some typical customers, and go to the enterprises that have used the company's products to understand the operation of the unit;

The third is after-sales service, the working conditions of the generator set are very harsh, and machine failures are inevitable, so it is very important to understand the after-sales service ability of the manufacturer, such as technical equipment, the number of after-sales personnel, after-sales service vehicles, and the service attitude of technical personnel;

Fourth, accessories and consumables, if it is an imported unit, see whether the manufacturer has enough imported accessories and consumables, because some small factories are in the same industry to transfer goods, accessories and consumables are difficult to guarantee; Buyers can choose the right supplier according to these conditions.

The generator power is based on the power of the equipment in the home multiplied by 3 times the starting current, for example: the power of the rice cooker is 200w, the induction cooker is 1200w, and the sum is 1400w 1400 times 3 = equal to the power of the generator).

The selection of a generator should be considered from the following points:

Step 1: Determine the power of the electrical equipment, if the power of the electrical equipment is 300kw, then it is not possible to choose a 300kw generator, because a starting current should also be considered. When the electrical equipment is started, it is necessary to overcome the inertia to do work, and the starting current is generally 2-7 times that of the actual electrical deficit and disadvantage.

Step 2: Choose the diesel engine brand of the generator, know the starting current to determine how big the generator to use, and the performance indicators of the generator, the diesel engine accounts for a considerable proportion, because the power of the generator is the diesel engine, the diesel engine is full of power, easy to maintain, and the failure rate is low.

Step 3: The age of the generator, the age of the generator is clearly the cumulative running time, the generator is different from other machines, if it is used as a standby machine, it may not run for ten or eight years. If it is used as a long-lasting power supply, it is 24 hours of continuous operation.

The service life of the diesel engine is generally relatively long, and the machine that has been running continuously for 5 years is still no problem, but there is a big difference between a new machine and an old machine in terms of obstacle rate, fuel consumption, noise, exhaust emissions, etc., so try to choose a relatively new machine.

Qingdao Starlight diesel generator set should pay attention to the following eight traps:

1. Confuse the relationship between KVA and KW. Exaggerate the power of KVA as KW and sell it to customers. In fact, kva is the apparent power, kw is the effective power, and the relationship between them is ikva=.

Imported units generally use KVA to represent the power unit, while domestic electrical equipment is generally expressed in KW, so KVA should be converted into KW by 20% when calculating power.

2. Don't talk about the relationship between the long-line (rated) power and the backup power, just say a "power", and sell the backup power to customers as the long-line power. Actually, backup power = long line power. Moreover, the backup power can only be used for 1 hour of 12 hours of continuous operation.

3. The power of the diesel engine is configured as large as the power of the generator to reduce costs. In fact, the industry generally stipulates that the diesel engine power generator power is 10%, because there is mechanical loss. What's more, there are also diesel engine horsepower as kilowatts of false alarm to the user, and the diesel engine less than the generator power to configure the unit, commonly known as:

Small horses and large carts, so that the life of the unit is reduced, frequent maintenance, and the use fee remains high.

4. Sell the refurbished machine to customers as a new machine, and some will match the refurbished diesel engine with a new generator and control cabinet, so that the general non-professional users can't tell whether it is a new machine or an old machine.

5. Only report the brand of diesel engine or generator, not the place of origin, and do not report the brand of the unit. Such as Cummins in the United States, Volvo in Sweden, and Stanford in the United Kingdom. In fact, no diesel generator set can be completed by a single enterprise independently.

Customers should have a comprehensive understanding of the diesel engine, generator, control cabinet manufacturers and brands of the unit, in order to comprehensively evaluate the grade of the unit.

6. Sell the unit without protection function (commonly known as four protection) as a unit with complete protection function to customers. What's more, units with incomplete instrumentation and no air switch are marketed to customers. In fact, the industry generally stipulates that units above 10kw must be equipped with full meters (commonly known as five meters) and air switches; Large units and automated units must have self-four protection functions.

7. Don't talk about the brand grade of diesel engine and generator, control system configuration, don't talk about after-sales service, blindly talk about ** and delivery time. Some will also use non-power station special oil engines, such as: marine diesel engines, vehicle diesel engines for generator sets.

The quality (voltage and frequency) of electricity, the end product of the unit, cannot be guaranteed. Units that are too low ** generally have problems, commonly known as: only buy the wrong one, not sell the wrong one!

8. Don't talk about random accessories, such as with or without mufflers, fuel tanks, oil pipes, what grade of batteries, how large capacity batteries, how many batteries, etc. In fact, these annexes are so important that they must be written out in the contract. What's more, they don't even bring a fan to the water tank, so customers can open the pool by themselves.