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Construction of Radiator for Generating Set

Dec. 27, 2018

The function of the generator set radiator is to dissipate the heat carried by the cooling water into the atmosphere to lower the temperature of the cooling water. The heat sink must have sufficient heat dissipation area and be made of a material with good thermal conductivity. Its structure is shown in Figure 1(a). It consists of a water tank (some with air-steam valves), a core and a drain tank. composition. The upper and lower water tanks are used to store cooling water, and a water inlet for injecting cooling water is opened at the top of the upper water tank, and the water tank cover is closed. The hot water in the water jacket of the diesel engine flows into the water tank from the water outlet on the cylinder head, is cooled by the radiator core, flows to the lower water tank, and is sucked into the water pump through the outlet pipe of the lower water tank.

Construction of Radiator for Generating Set.png


The radiator core structure is commonly used in the form of tube and tube. The tube-shaped core structure is as shown in Fig. 1(b), and is composed of a plurality of flat water pipes welded to the multilayer heat sink. The core has a large heat dissipation area, low resistance to airflow, good structural rigidity, strong pressure bearing capability, and is not easily broken. The disadvantage is that the manufacturing process is more complicated. The structure of the tube-and-belt core is as shown in Fig. 1(c), and is formed by arranging a corrugated heat-dissipating belt and a flat tube. The slot is opened to break the airflow boundary layer to increase heat transfer. The rigidity of the core is not as good as that of the tube piece, but the manufacturing process is simple, and it is convenient for mass production, and its application has gradually increased.


The radiator core is made of brass. Brass has good thermal and corrosion resistance, is easy to form, has sufficient strength and is easy to weld. In order to save copper, in recent years, aluminum alloy radiators have also developed.


The closed forced circulation cooling system is a closed system that increases the boiling point of the cooling water after increasing the system's steam pressure. As the temperature difference between the cooling water temperature and the outside air temperature increases, the heat dissipation capability of the entire cooling system is also improved. However, if the steam pressure in the cooling system is too large, the weld or water pipe of the radiator core may be broken. When the water vapor in the cooling system condenses, the vapor pressure in the system is lower than the external atmospheric pressure. If the pressure is too low, the radiator core may be crushed by the external atmospheric pressure. Therefore, the air tank cover of the closed cooling system is equipped with an air-steam valve. The air-steam valve is generally mounted on the radiator cover, and some diesel engines are installed on the side of the radiator on the radiator. When the diesel engine is overheated, if you need to open the radiator cover of the closed forced circulation cooling system, it should be slowly unscrewed to gradually reduce the pressure in the cooling system to prevent steam and hot water from escaping. If you want to loosen the drain switch to release the cooling water, you need to open the radiator cover before you can drain the water.


Diesel generator set radiator use precautions


The radiator of the diesel generator set bears a large amount of heat generated when the diesel generator set runs the load and guarantees the continuous operation of the unit. Therefore, it is one of the indispensable important components in the unit configuration. Let me introduce the four details that need to be paid attention to during the operation of the generator set radiator.


1. The coolant of the genset radiator in operation is usually very hot and under pressure. It is not possible to defragment the radiator or remove the pipe when it is not cooled. Do not operate the radiator or open the fan guard when the fan is rotating.


2. Prevent corrosion problems. Always keep the pipe joints from leaking and regularly add water from the top of the radiator to keep the system "airless". The radiator should not be in a condition where part of the water is injected, as this will accelerate corrosion. For generators that are not working, drain all or all of the water. If possible, use distilled water or natural soft water and add an appropriate amount of rust inhibitor.


3. External cleaning. In dusty or dirty environments, the gaps in the radiator may be clogged with debris, insects, etc., affecting the efficiency of the radiator. Frequent cleaning of these light deposits can be sprayed with low pressure hot water plus detergent to spray steam or water from the front of the radiator to the fan. If you spray from the opposite direction, only the dirt will be blown into the center. When using this method, use a cloth to block the diesel engine and the alternator. If the stubborn sediment cannot be removed by the above method, the radiator can be removed and immersed in hot alkaline water for about 20 minutes, then rinsed with hot water.


4. Internal cleaning. If the joint leaks, there is no choice to use the hard water irrigation method for a period of time, or because the power generation has been running for a while and no rust remover is used, the system may be blocked by scale. To remove scale, proceed as follows:


1) Drain the water from the cooling system and disassemble the pipe from where the diesel engine is connected.

2) Accurate 4% rust acid solution and water, pour the acid into the water, do not reverse.

3) Wait a few minutes for it to mix, then heat the solution to 49 ° C (120 ° F), which is the highest point, no higher.

4) Slowly pour the solution through the filter cap or a split into the pipe and it will boil. When the chemical reaction stops, fill the hot solution with the hot solution.

5) Let the solution stay in the system for a few minutes, then return the solution from the bottom pipe or drain to the original container.

6) Check the inside of the water tank. If there is still scale, repeat the above steps to increase the acid solution to 8%.

7) After descaling, follow the steps below to neutralize the acid solution: fill the container with water, heat to the boiling point, add daily soda crystals, according to the following ratio: 500g soda with 20 liters of water (1 lb with 4 Galen water), use this solution to fill the radiator, and then let it flow back to the original container.

8) Rinse the radiator several times by the above method, and finally stop it in the radiator for at least one hour after filling, rinse it with hot water after emptying.

9) Before reinstalling the radiator, use twice the normal working pressure to test for leaks, sometimes leaking due to scale removal.

10) Before re-running, the coolant should be added with the necessary corrosion inhibitor and the right amount of condensation agent.



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