Industrial furnace circulating water cooling tower system

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Based on the long-term design and use of industrial furnaces, our company has in-depth design experience in circulating water cooling systems at industrial sites. At the same time, we have a mature and skilled construction team that can well solve problems such as cooling capacity. Insufficient, winter freeze damage, water hammer phenomenon, power outage without self-protection, system leakage, pipeline scaling and many other problems, we provide external design, selection, installation and other work for industrial furnaces and other occasions that require circulating water cooling.

Effect

The main function of the circulating water cooling tower system is to provide the required water flow, water pressure, and water quality, and to reduce the inlet water temperature to a certain temperature and then discharge it to industrial equipment.

Constitute

The circulating water cooling tower system generally consists of inlet and outlet pipes, flanges, buffer sections, valves, cooling systems, variable frequency water pumps, variable frequency control cabinets, backup water, stepless switching backup power supply, etc.

Cooling tower selection

Cooling water flow calculation:

L=(Q1+Q2)/(Δt*1.163)*1.1
L—cooling water flow rate (m3/h)
Q1—The total cooling load multiplied by the simultaneous use factor, KW
Q2—Power consumption of the compressor in the unit, KW
Δt—temperature difference between cooling water inlet and outlet, ℃, generally 4.5-5
Cooling tower water flow = cooling water system water volume × (1.2~1.5);
Most of the cooling tower's capacity is the output under standard working conditions (wet bulb temperature 28°C, cold water inlet and outlet temperature 32oC/37oC). Due to regional differences, the wet bulb temperature will be different in summer, and should be corrected according to the curve provided in the manufacturer's catalog. Wet bulb temperature can be obtained by checking local meteorological parameters.
The distance between the cooling tower and surrounding obstacles should be one tower height.
The definition of the cooling capacity of the cooling tower is: when the wet bulb temperature of the air is 27°C, if 13L/min (0.78m3/h) of pure water is cooled from 37°C to 32°C, it is 1 ton of cooling, and the heat dissipation is 4.515KW.
For every 1°C increase in wet bulb temperature, cooling efficiency decreases by approximately 17%

Cooling tower cooling capacity calculation:

Q=72*L*（h1-h2）
Q-cooling capacity (Kcal/h)
L-cooling tower air volume, m3/h
h1-cooling tower inlet air enthalpy value
h2-cooling tower outlet air enthalpy
If the cooling tower is automatically controlled, electric valves must be installed for both inlet and outlet water, otherwise water will be sucked in or overflowed when a single unit is controlled.
Determination of cooling water pump head
The head is the resistance of the cooling water system + the height difference from the cooling tower water pan to the water distributor + the required pressure of the water distributor

5. Different types of noise from cooling towers and treatment methods:

6. Cooling water pipe diameter selection

Common water pipe data

Common water pipe data 1

Cooling water pump head:
The lift of the cooling water pump needs to overcome 1. The condenser resistance of the unit 2. The local resistance along the pipeline 3. The height difference of the cooling tower 4. The height difference of the cooling tower
Spray pressure. When selecting a cooling water pump, you need to carefully check the various parameters of the cooling tower. The lift of the cooling water pump is selected according to the following formula.
Cooling water pump head calculation formula: H={P1+P2+P3+0.04·L*(1+K)}*n
in the formula
H-the required lift of the water pump, m;
P1 - condenser resistance of air conditioning main unit, m;
P2 - the height difference between the cooling tower water nozzle and the drain pan, m;
P3--The spray pressure of the cooling tower water distributor nozzle (circular counterflow cooling tower is about 2---5mH2O,), m;
L——The total length of the most unfavorable loop, m;
K - the ratio of the sum of local resistance equivalent lengths in the most unfavorable loop to the total length of straight pipes (m). Generally, K is 0.3~0.5;
n is the safety factor, generally 1.1~1.2.
Lift usually refers to the maximum height that the water pump can lift, represented by H. The most commonly used formula for calculating the pump head is H=(p2-p1)/ρg+(c2-c1)/2g+z2-z1.
Among them, H - head, m; p1, p2 - pressure of the liquid at the pump inlet and outlet, Pa; c1, c2 - flow rate of the fluid at the pump inlet and outlet, m/s; z1, z2 - height of the inlet and outlet , m; ρ——liquid density, kg/m3; g——gravitational acceleration, m/s2.
Usually the specific rotation number is used
For centrifugal clean water pumps with ns between 130 and 150, the flow rate of the water pump should be 1.1 to 1.2 times the rated flow rate of the chiller (1.1 for a single unit and 1.2 for two units in parallel.
According to estimates, the loss along the way per 100 meters of pipe length can be roughly taken to be 5mH2O, and the water pump head calculation formula (mH2O) is:
Hmax=△P1+△P2+0.05L(1+K)
△P1 is the water pressure drop in the evaporator of the chiller.
△P2 is the water pressure drop of the unit with the largest water pressure loss among the parallel connected air conditioners in the ring.
L is the pipe length of the most unfavorable loop
K is the ratio of the sum of the local resistance equivalent lengths in the most unfavorable loop to the total length of the straight pipe. When the most unfavorable loop is long, the K value is 0.2 to 0.3. When the most unfavorable loop is short, the K value is 0.4 to 0.6.
Note: Our company only provides the design and installation of cooling circulating water systems and does not produce cooling towers. The content of the cooling tower pictures on this site comes from the Internet. If there is any infringement, please contact us to delete it.

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