DBNL series circular counterflow steel frame cooling tower
Circular counterflow fiberglass cooling towers utilize counterflow gas-heat exchange technology. The fill material employs high-quality modified polyvinyl chloride wave plates to increase the water distribution area. A rotating water distribution method ensures uniform water distribution, enhancing cooling efficiency.
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Gravity Cooling Tower Series
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DBNL series circular counterflow steel frame cooling tower
Preface
With the development of industrial production and the continuous improvement of people's living standards, controlling water pollution and rationally utilizing water resources has become imminent. To this end, many units have generally adopted fiberglass cooling towers, an ideal energy-efficient equipment, to implement internal water closed-loop circulation, improve the reuse rate, effectively reduce costs, and at the same time, transform people's desire to adjust the ambient temperature, humidity, cleanliness, and noise impact into reality. Fiberglass cooling towers are corrosion-resistant, high-strength, lightweight, small in size, space-saving, beautiful and durable, and are convenient for transportation, installation, and maintenance. Therefore, they are widely used in various sectors of the national economy, and are particularly suitable for cooling water circulation systems such as air conditioning, refrigeration, air compressor stations, heating furnaces, and condensation processes.
The circular counter-flow fiberglass cooling tower adopts counter-flow gas-heat exchange technology. The filler uses high-quality modified polyvinyl chloride wave plates to expand the water distribution area; through the rotating water distribution method, uniform water distribution is achieved, enhancing the cooling effect. Our factory has made partial improvements to the exterior design of this series of products, making it more reliable, durable, and easy to assemble.
Main Uses
(1) DBNL3 series low-noise fiberglass cooling tower - Suitable for general cooling occasions such as air conditioning and refrigeration units with a water temperature drop of 3-8 degrees.
(2) CDBNL3 series ultra-low noise fiberglass cooling tower - Suitable for hotels, hospitals, public buildings, and occasions closer to residential areas with stricter noise requirements.
(3) GBNL3 series medium and high temperature industrial fiberglass cooling tower - Suitable for industrial water circulation cooling systems with a water temperature drop of 10-25 degrees.
Model Composition
There are three series of circular counter-flow fiberglass cooling towers: DBNL3, CDBNL3, GBNL3
D: Low noise CD: Ultra-low noise G: Industrial type B: Fiberglass N: Counter-flow L: Cooling tower
Performance and Selection
1. Design parameters:
1) Standard conditions: Inlet water temperature t1 = 37℃, outlet water temperature t2 = 32℃, design wet-bulb temperature τ = 28℃, i.e., water temperature Δt = 5℃, cooling range t2-τ = 5℃
2) Medium temperature conditions: Inlet water temperature t1 = 43℃, outlet water temperature t2 = 33℃, design wet-bulb temperature τ = 28℃, i.e., water temperature Δt = 10℃, cooling range t2-τ = 6℃
3) High temperature conditions: Inlet water temperature t1 = 60℃, outlet water temperature t2 = 35℃, design wet-bulb temperature τ = 28℃, i.e., water temperature Δt = 25℃, cooling range t2-τ = 8℃
2. When selecting, the water quantity Q, inlet water temperature t1, outlet water temperature t2, and design wet-bulb temperature τ must be known, and then the model can be determined according to the thermodynamic performance curve. The thermodynamic performance curves are shown in Appendix 1 and Appendix 2. For conditions outside the curve table, thermodynamic calculations can be performed. The volumetric mass transfer coefficient β × ν of the filler is as follows: 1.2 times the nominal flow rate: β × ν = 18600; 1.0 times the nominal flow rate: β × ν = 17800; 0.8 times the nominal flow rate: β × ν = 17000.
3. The operating weight is calculated based on half the depth of the water in the tower body. If calculated based on full water, it should be multiplied by 1.5.
4. This series of cooling towers are used in areas where the average temperature of the coldest month is not lower than -10℃. Users in areas with lower temperatures should request freeze prevention measures to configure a water distribution diversion ring to prevent water from flowing onto the louvers. During intermittent operation in winter, electric heating tubes can be added to the water tank. This series of cooling towers are used in areas where the average temperature of the coldest month is not lower than -10℃. Users in areas with lower temperatures should request freeze prevention measures to configure a water distribution diversion ring to prevent water from flowing onto the louvers. During intermittent operation in winter, electric heating tubes can be added to the water tank.
5. The turbidity of the circulating water should not exceed 50 mg/L, and should not exceed 100 mg/L in the short term. It should not contain oil stains and mechanical impurities. If necessary, algae control and water quality stabilization measures should be taken.
6. The applicable water temperature does not exceed 60℃. If it exceeds, it can be specified when ordering, and our factory will solve it in terms of material selection. If a flame-retardant cooling tower is required, please specify it when ordering, and our factory can meet the requirements.
7. The water distribution pipe is perforated according to the nominal flow rate. If the actual flow rate differs from the nominal flow rate by more than ±15%, the user should specify it when ordering.
8. The water pressure of the inlet pipe is approximately 2-5 meters of water column. The design should not have excessive pressure, otherwise it will cause water spraying.
9. Motors and fans are supplied as standard. Our factory needs to send personnel for on-site installation or technical guidance.
10. When the user needs to directly draw water from the lower tower body of the cooling tower, "automatic water supply pipe", "rapid water supply pipe", "drain pipe", and "overflow pipe" need to be installed. Please specify when ordering.
Structural Features
(1) Tower body: Reasonable lines, stable airflow, excellent material, bright colors, the surface gel coat resin contains anti-ultraviolet agent, is resistant to aging, high strength, light weight, and corrosion-resistant. According to the order requirements, the lower tower body can be equipped with overflow, drainage, and automatic water supply pipes, and water can be directly drawn from here, saving the cooling pool. A noise-reducing pad is installed on the top, effectively reducing the dripping sound.
(2) Filler: Modified polyvinyl chloride wave plates are used, with transverse convex ribs added, strong water redistribution ability, low resistance, good thermal performance, high temperature resistance of 70℃, low temperature resistance of -50℃, and good flame retardancy.
(3) Rotating water distributor and water distribution pipe: Equipped with stainless steel ball bearings, flexible and reliable operation, low head, uniform water distribution, using aluminum alloy or fiberglass water distribution pipes, water collecting plates are installed on the pipes to overcome the phenomenon of water spraying.
(4) Fan: Low-noise, high-efficiency fan designed by the Department of Engineering Mechanics, Tsinghua University, according to the parameters of the series cooling tower, aluminum alloy blade type or fiberglass blades, low noise, high efficiency.
(5) Motor: The YLF series motor is a new generation of three-phase asynchronous motors specially designed for cooling towers by our company. Its design concept and structural type fully consider the usage environment of cooling tower motors. It achieves a reasonable match with the cooling tower in terms of sealing, moisture resistance, water resistance, and reliability, fully meeting the outdoor protection requirements for long-term operation in humid and hot environments.
(6) Speed Reducer: The NGW type cooling tower dedicated low-noise planetary gear reducer. The gear material of this reducer is carefully selected, and the manufacturing process is rigorous. After mechanical processing, it undergoes tempering, carburizing, quenching, and other heat treatments. All gears are finally ground (external teeth), ensuring the overall quality of the reducer. Due to the use of planetary gear transmission, it can withstand high-speed heavy loads and has the advantages of impact resistance, corrosion resistance, stable operation, and low noise. Its matching motor is the YLF series cooling tower dedicated three-phase asynchronous motor.
(7) Sound Absorption Facilities: The ultra-low noise cooling tower adds a shield with sound-absorbing material to the air inlet and installs sound-absorbing grids at the top and bottom to achieve maximum noise reduction. A horn-shaped shield and sound-absorbing grid with sound-absorbing material are installed at the outlet of the upper tower body to reduce the noise from the fan and motor.
(8) Air Inlet Window: Equipped with fiberglass louvers to reduce water drift, with low airflow resistance, especially suitable for northern regions and units that need to use cooling towers throughout the year.
(9) Support: All steel supports for fans, fillers, air inlet windows, and tower bodies are assembled and galvanized or painted for corrosion protection. Fasteners are all galvanized or stainless steel bolts.
Installation, Debugging, and Usage Instructions
1. The foundation drawings and installation dimensions in this manual are for reference during installation. The direction of the inlet and outlet pipes of the small counterflow tower can be arbitrarily selected in the horizontal position, but it must not collide with the foundation. For those with a foundation in the middle, its load should be 25% of the operating weight, and the remaining 75% should be evenly borne by the outer rectangular foundation. If installed on the roof, the additional pressure caused by the load should be considered.
2. Brackets should be installed at the connection points between the cooling tower and the inlet and outlet pipes to prevent excessive weight from pressing on the tower walls.
3. The fan blades should be adjusted before installation and use to maintain consistent angles. The method is to make a mark on the front and rear edges of each blade 150 mm away from the blade spacing. Then, measure the distance between the front and rear edges of each blade from the lower chord of the bracket to calculate the height difference between the front and rear edges of each blade at this point. Through several adjustments, the height difference is consistent, indicating that it is qualified.
4. After connecting the motor wires, seal the junction box and pay attention to not exceeding the rated current of the motor.
5. When starting the cooling tower, the water pump must be started first, followed by the fan. Do not operate the fan without water spraying. The fan can be reversed at low speed for a short time to de-ice.
6. The reducer should be oiled before use. No. 50 anti-wear gear oil or engine oil can be used for lubrication. The oil should be changed after the initial 100-300 hours of operation, and then every 3000-5000 hours of operation. The oil level should be moderate, and the oil gauge should be easy to observe.
7. When the cooling tower is in operation, a dedicated person should manage it and regularly pay attention to changes in current and water temperature. Regular inspections should be carried out on the motor, reducer, water distributor, and other parts.
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