1. What is the cooling tower filler?
cooling tower filler is the core component of cooling tower . The filler increases heat dissipation in the cooling tower, extends the cooling water residence time, and increases the heat exchange area, which plays a significant role in the cooling effect of circulating water .
2. Filler selection
Studies have shown that the heat dissipation capacity of water-sinking fillers can reach more than 70% of that of conventional cooling towers, so the selection of fillers is crucial. There are many factors that affect the selection of filler, and many factors need to be comprehensively considered, such as cooling tower form, thermal characteristics, cooling tasks, circulating cooling water quality, ventilation conditions, thermal resistance characteristics of filler, support method of filler, cost of filler, etc.
So how can we choose the right water pouring filler? Here are a few suggestions for your reference.
1. Select
When the concentration of suspended material such as raw oil may leak in water or fibers or cooling water in water is greater than 100mg/L, it is advisable to choose drop-and-drop filler; when there is no leakage and the water quality is better controlled or the concentration of suspended material of cooling water is less than 50mg/L, it is advisable to choose thin-and-drop film mixing filler; when the site is restricted and the concentration of suspended material of raw oil contaminants or cooling water may leak in water is between 50mg/L and 100mg/L, it is advisable to choose drop-and-drop thin-and-drop film mixing filler.
2. Select the filling of
5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 However, the filler depth (diameter depth) has a direct impact on the overall size of the tower, so the filler should be compared with the tower body height. Generally speaking, the ratio of the filling height and diameter depth of the water-sink filler is between 2.0 and 2.5.
3. Select
fillers of different materials have their own different applicable temperatures. In fact, even if the materials are the same and the varieties are different, the temperature resistance and physical properties may vary greatly. For example, the plastic materials widely used in cooling towers are currently: modified polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC), and polypropylene (PP). Research data shows that modified polyvinyl chloride (PVC) is best used when the water temperature in the tower is not greater than 45℃, while chlorinated polyvinyl chloride (CPVC) is worse than that of modified polyvinyl chloride (PVC), and the heat dissipation performance is not as good as the former. Ethylene (PP) has poor aging resistance and is flammable in low temperature environments; when the water temperature in the inlet tower exceeds 45℃, the temperature resistance of chlorinated polyvinyl chloride (CPVC) and polypropylene (PP) fillers is significantly better than that of modified polyvinyl chloride (PVC), and should be preferred; when the water temperature in the inlet tower exceeds 60℃, polypropylene (PP) has better choice due to its higher temperature resistance; when the water temperature in the inlet tower exceeds 70℃ or higher, the above three plastics are no longer applicable, and other high-temperature resistant materials such as aluminum alloy should be considered.
4. Select the thermal characteristics and resistance characteristics of
filler should be comprehensively evaluated in combination with the fan characteristics, and the one with the largest cooling capacity under the same design conditions should be selected. Because the thermal performance of the filler is good and the resistance is often high, in natural towers, the resistance of the filler is balanced by the pulling force of the tower, and the pulling force is proportional to the air density difference of the filler in and out. Generally speaking, fillers with high thermal performance use relatively low gas-water ratio, while air density is relatively different, which can improve suction force. In the exhaust mechanical ventilation cooling tower, the suction force is provided by the air pressure of the fan, and the actual working air pressure of the fan is proportional to the air density. When using fillers with relatively low air-water ratio, the air density at the tower outlet is relatively low, which has the effect of reducing the air pressure, which is exactly the opposite of the former.In some example calculation comparisons, it can be seen that in natural towers, when some fillers with better thermal performance sorting are used in mechanical ventilation and cooling towers, the order is reversed, so when selecting fillers, they should be comprehensively evaluated together with the fan characteristics.
5. Select
For large cooling towers, when the filling installation method is hoisted, the filling should be fully considered. The assembly form of fillers should be stable and convenient for construction and daily maintenance. In addition, when the packing block is directly simply supported on the support beam, the support beam should adopt a structure with a small width and low ventilation resistance, and the middle distance of the beam should be matched with the optimal size of the simple support of the packing block. When using support gratings, the span of the simply supported grating design should be consistent with the span of the support beam, the corrosion resistance of the grating should be consistent with the filler, and the influence of the grating on ventilation resistance should be taken into account.
In short, for water-sinking fillers, after fully considering all aspects of the conditions, it is advisable to choose fillers with good thermal and resistance performance, good stiffness, corrosion resistance, anti-aging, and flame retardant properties.
3. Replacement and installation
. Like other cooling tower components, the use of fillers also requires daily maintenance and waste replacement. Generally speaking, after the cooling tower is normally used for 5-8 years, the filler needs to be replaced. If normal maintenance is not carried out, the filler must be replaced once every 2-3 years. If there is scaling, sinking, aging, etc., it should be replaced in time to ensure that the cooling tower's performance reaches its target. The replacement of the filler of
cooling tower requires cleaning and cleaning of the tower on the basis of removing the waste cooling tower, and laying new fillers scientifically in sequence. The following steps are generally followed for the replacement of new and old fillers:
1. Before construction, protect other equipment on site and perform necessary isolation and listing. Lay the facilities on the waterproofing layer on the floor.
2. Remove the old filler. Turn off the motor power, remove the tension of the cooling tower filler, and then remove the old filler and clean up the garbage in the tower.
3, fill with new filler. Adhesive the cooling tower filler and ensures the space for the filler to place during the adhesive curing time, ensures that the filler contact points are at the same level during bonding, and ensures that the filler contact points are uniform and tight during the crimping process.
4, clean the tower. Clean up dust and garbage inside the cooling tower, stack the filler in the cooling tower in sequence, and trampling and extrusion are strictly prohibited to ensure that each stack and each layer of filler block is neat, ensure that the filler is tight and seamless, and the difficulties do not exceed 2mm apart. Restore the tension at the filler part of the cooling tower.
5. The assembly blocks should be assembled in the upper and lower directions. The top surfaces of each layer must be laid flat, cleaned between layers, and removed debris.
6. When installation, maintenance and other work require operation on filler, it must be carried out on the flat plate. It is strictly forbidden to step on the filler.
7. During the entire construction process, welding operations above the filler are strictly prohibited, and fire prevention measures should be taken if necessary. After all the processes of replacement, tower body maintenance and other processes are completed, the construction tools and auxiliary installation facilities will be brought out, and the project will be completed successfully.
4. Cooling tower cleaning
(1) Disassemble and clean the filler of the cooling tower. Pay attention to the stack order when disassembling, cleaning and reducing the filler module. If necessary, adjust the stack position and order during restoration and installation;
(2) Clean the cooling tower water 3. Clean the cooling tower and its Y-type water filter ;
(4) Use a long-haired hard brush and high-pressure water gun to flush and flush the disassembled cooling tower filler piece by piece, and visually measure whether the scale adhered to the filler surface wall falls off. It is best to restore the surface wall of the cooling tower filler to the cost color;
(5) check the integrity of the filler and organize the damaged filler. If necessary, it is recommended to replace the damaged severe filler to ensure the operating efficiency of the cooling tower;
(6) refill the filler and it is recommended to stack the filler in advance to facilitate the cleaning of the filler. After the playback, it is recommended to regularly adjust and stack each piece of filler to synchronize the aging rate of filler;
(7) chassis discharge. In order to avoid waste of water resources, it is necessary to eliminate the discharge of pollutants while cleaning
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