: 4.5 out of 5
The Drift Eliminator is a trap for trapping water droplets sucked into the air outlet in the cooling tower. The main function of this section is to prevent water droplets from drifting or falling towards the impeller Is a fan). In fact, the word Drift Eliminator in English consists of two main parts. The first part of the word (Drift) means throwing small drops of water from the outlet of the cooling tower nozzle towards the fan and the second part of the word (Eliminator) means the eliminator.
Types of applications for drippers or drippers (eliminator)In addition to being used in cooling towers, drippers are also used in a variety of air washers and evaporative condensers. Due to its protective role, it is considered as one of the most important parts of the cooling tower . Takes. In order to increase the efficiency of the dripper, in some cases, two or more layers of drippers are generally used to prevent water droplets from escaping.
The standard height of the drippers used in the cooling tower and air washer varies between 13 to 20 cm and varies according to the type of dripper (honeycomb or blade). The amount of water droplets or droplets thrown towards the impeller is not more important in terms of energy consumption (water consumption), but the use of the eliminator in the air outlet in devices that deal with water spraying (such as cooling towers) has a greater protective role of parts. It is responsible for being in contact with the exhaust air. Some of these components include the engine, fan or impeller of the cooling tower and the transmission system.
How the cooling tower dripper worksWhen the fan in the cooling tower sucks the air flow upwards with a certain pressure from the Louvre (air inlet shutter), a small rate of droplet outlet of the cooling tower nozzle nozzle is due to the suction force of the impeller. It is directed to the fan deck output. These droplets of water lose their force (trapped induction suction force) in the collision with the plates and dripping blades of the cooling tower and return to the bottom (packing media) due to their gravitational force. Simply put, the cooling tower drip trap is a kind of trap in the path of water droplets sucked towards the impeller, which prevents the exit of these small and macroscopic water droplets (Drift).
Application and location of cooling tower dripperDrippers or drippers are used in various types of cubic and conical cooling towers (open circuit) as well as in different capacities of hybrid CCTV cooling towers. In addition to the cooling tower, this equipment is also used in various types of air washers, and its purpose is to prevent droplets and water vapor from passing out of the device, and by creating a contact surface, it causes condensation or dew of some of the droplets and existing moisture. It circulates in the air and hence it is also called dewdrop. The importance of the drip trap is more due to the direct effect of this part on the water consumption of the cooling tower and air washer. Incidentally, in order to reduce the amount of water consumption in the calculations of the cooling tower, the use of drip traps or dew traps is highly recommended.
In the cubic cooling tower, the location of the dropper is located at the top of the nozzle (nozzle) and before the fan or fan section. The droplets coming out of the nozzle in the cubic cooling tower are returned downwards by the dropper. In a conical cooling tower, a dripper or eliminator is connected to the top of the sprinkler or water dispenser outlet pipes on the pipe by a clamp, and water droplets and vapors from the holes of the rotating water spray system after hitting this type of drop. The traps are deflected downwards. In common parlance, a conical or circular cooling tower drip is also abbreviated as an eliminator.
Cooling tower drip materialCubic cooling tower drippers are produced and supplied in two types of honeycomb or cellular and blade type. Due to the constant contact of the cooling tower drip or dew trap with the humid air flow and water droplets, this equipment is generally made of polymeric materials. The main material of the cooling tower dripper is generally either PVC (polyvinyl chloride) or in some species PP (polypropylene) material is used in the production and design of the dripper.
Eliminators or conical cooling tower drippers are also generally made of PP and fiberglass FRP. All three materials, PVC, PP and FRP, have good resistance to sediment, corrosion and rot against water, and in fact, the main reason for choosing these three grades of materials in the construction of cooling tower drippers is the above reasons.
Blade and honeycomb drippers are produced by extruder (continuous injection and forming) and then assembled by special granule adhesive and spacer (filling distance). Blade drippers are extruded to specific lengths and then placed side by side between 10 and 12 fillers. The width created by each complete drip set is equal to the width of the 33 cm blades, which are coiled together as male and female. The injection of blade-shaped blades of blade drippers is adjusted to a thickness of 500 to 800 microns, and the produced sheets are produced and supplied as single-chamber and double-chambered.
Granular grade used in blade drippers made of polypropylene grade copolymer material with the highest percentage of transparency and impact, which at a temperature between 150 to 200 degrees under the process of melting and forming sinusoidal sheets. The grade of granulation used in the injection of drip-shaped block molds of honeycomb is of different grades in black, gray and white colors. Lighter draft grades have more flexibility and resistance than dark grades.
Advantages of using a drip trap in a cooling towerPrevent excessive consumption of water by drift or dropping drops in the drip trap
Prevent droplets from entering the fan and damaging the impeller, motor and cooling tower aeration system
Increase the service life of aeration system components by reducing the amount of drift in the cooling tower
Reduce the amount of TDS by reducing the amount of water thrown in the cooling tower
No sedimentation and corrosion against water and moisture in the air
High resistance to sunburn and UV radiation in polypropylene grade
High resistance to acid leaching and acid vapors in the air (scrubber)
Types of cooling tower drippers1- Cooling tower honeycomb drip catcher:
This drip model is used in all types of open circuit cooling towers and closed circuit cooling towers and is in fact the most widely used type. The name of the honeycomb drip extractor is derived from the appearance and regular hexagonal geometric shape (similar to a honeycomb) of this equipment. Honeycomb drip extractors are generally produced from PVC sheets with a thickness of 500 to 800 microns. These polyvinyl chloride sheets are bonded together by special granular adhesives in the molding machine. In fact, the honeycomb dripper has a very high efficiency in preventing drift in the cooling tower due to its network structure. The passage of water droplets after using the eliminator is about 0.002% of the total water droplets.
This model of cooling tower shock absorbers is used in various types of cubic and even conical cooling towers due to its high efficiency. In circular or cylindrical cooling towers, the cut view of cellular drip blocks is used for arrangement near the fan section. To maintain the dripper in this case, restrained supports are used on the body (panel).
In some cases, half of the dripper is used in the Louvre of the cooling tower, in which case due to direct sunlight, after a short time, the PVC material will be crushed and the dripper used in the Louvre of the cooling tower will be destroyed. Went. Therefore, it is strongly recommended not to use pivot-type louvers (honeycomb) in the cooling towers of the opposite current and cross current. Instead of using honeycomb louvers, use a variety of fiberglass blades in the cooling tower.
Types of Honeycomb Drip Cooling Tower
Honeycomb drippers can be produced and supplied in three different grades of PVC material. Based on the percentage of polyurethane used in the raw material granules, the production structure of this equipment is presented in three grades: white, gray and black. Nesting drip traps are generally produced and supplied in 30 cm and 60 cm width and 13 cm in height in block form.
Technical specifications of cooling tower honeycomb drippers:
Sheet thickness: between 400 to 800 microns
Block dimensions: 120 by 30 cm at a height of 13 cm
Material used: PVC granules (polyvinyl chloride)
Usage: Cooling tower - Air washer - Evaporative condenser - Inlet air filter (Louvre)
Step or distance between both ups and downs in cell structure: 19 mm
Grade 3 cooling tower nest drip trap:
The black grade of the cooling tower nest drip trap is actually produced from the mill of raw granule raw materials without the use of a percentage of polyurethane. This grade of products is actually very brittle, and also has a low temperature resistance to heat. Drip black grid is commonly used in environments without direct sunlight and in simple applications in all types of open circuit cooling.
Grade 2 cooling tower nest drip trap:
Gray Drip Gray Drip Cooling Tower Cooler actually contains 20% of polyurethane material mixed in granules. This drip trap is more flexible compared to Grade 3 and the temperature tolerance of this equipment is 55 to 60 degrees Celsius. Grade Tooth cooler's drip trap drip also has a very high resistance to direct UV (sunlight) radiation due to its Unti UV material. This drip model is used in all types of open circuit and hybrid cooling towers.
Grade 1 Cooling Tower Drip Clamp:
The cooling grade of the cooling tower nest drip tray contains 60% polyurethane. This model actually has a lot of flexibility and longevity compared to the two grades of gray and black. Grade 1 nest retarder has a cellular structure.
2- Cooling tower blade dripper:
What Khgyr blade (Blade Type Eleminator) each of Brjkhnkknndh Shbnmgyr is that most of the material PP (polypropylene) is produced. This dewatering model has a blade-shaped structure that is connected to each other by a spacer. The cooling tower blade dripper has a height of 15 cm compared to the cellular or nesting type and requires more space during installation in the cooling tower.
Cooling tower blade dripper has a droplet permeability of up to 0.005 %, so it has a lower efficiency than nest dripper, but it is generally produced and designed from PP or polypropylene, so it has a higher thermal resistance than PVC dewatering types. Also, the nesting model has acid washing and descaling capability due to its high chemical resistance, which means that in each period of repairs and inspections by acid washing, it can remove all the sediment created by the flow of water and air humidity.
The spacer is actually the creator who creates the distance between the drip blades or the eliminator, which is why this equipment is also called the filling space. The distance between the fillers used in the drip trap is generally made of polypropylene or PP material by plastic injection method by devices under 200 g. The produced spacers are coiled together as male and female and are placed next to each other in 10 -11 and 12-type types. The function of the spacer is to create a standard distance between the two drip blades in the cooling tower or air washer.
Types of cooling tower blade drippers
Single-bladed blade dripper
This drip model is mostly used in all types of reverse flow cubic cooling towers and has a height equal to 15 cm and has many applications in catching water droplets at the fan outlet. This drip model is placed horizontally on the pipe and fittings of the water spray section. Single-bladed blade drippers generally have a cross-section in the shape of a mountain or hump, which is why this equipment is named.
Dual-bladed blade dripper
This model is an eliminator or drip in the form of English letters W and has two protrusions in its cross section. This model of dripper is mostly used in all types of air washers and evaporative condensers installed vertically. The production material of this equipment is R-grade polypropylene, which is available in blue and white colors.
3- Cooling tower fiberglass eliminator
The cooling tower eliminator is a type of drip trap in the cooling tower that is responsible for preventing the droplets from coming out of the sprinkler or water dispenser pipes in the conical cooling tower. The finisher is usually known as the fin eliminator because of its fin-shaped appearance.
These eliminators are only used in the conical cooling tower. The eliminator is mounted on top of the sprinkler outlet pipes and is connected to the outlet pipe by a clamp. Cooling tower eliminators are generally made of FRP fiberglass or PP polypropylene.
The thickness of the eliminator or drip blades of a conical cooling tower is between 600 and 800 microns. This type can be installed as a blade with a width of 15 to 25 cm on sprinkler outlet pipes with a capacity of 30 tons to 1250 tons of refrigeration. Drift output decreases to less than 0.008 % of water droplets with the addition of the eliminator.
Price of cooling tower dripperThe price of a dropper varies depending on the volume and amount of purchase. The price of a dripper in a cooling tower varies depending on the type (blade or honeycomb) as well as the type of material used. The price of a blade dewater is higher than the price of a honeycomb in a cooling tower. The material used in the blade model (PP) has caused a price difference between the honeycomb model and the blade in the cooling tower. The exact cost estimate of this equipment can be changed according to the following factors.
- A) The type of dew trap has the greatest impact on the price of this equipment in the cooling tower ++.
- B) Material and material is also considered as the most influential item in the final estimate of the price of the cooling tower dripper.
- C) Thickness and weight can also have a significant effect on the price of this product.
- D) The daily price of the raw material of granules and polypropylene or fibers and resin (in the cooling tower eliminator) will naturally increase and decrease the price.
*** Therefore, determining the daily price of a cooling tower drip depends on several factors, so it is recommended to contact the experts of Dama Gostar Company for a detailed review . The experts of Dama Gostar Company will answer your inquiry online, dear buyer.
