Calculation of water consumption of cooling tower
Closed soft water cooling tower and (open cooling tower pool) comparison
(Take the project with an actual flow rate of 200 tons/hour, running 20 hours a day and 300 days a year as an example)
I. Electricity consumption caused by scaling of pool open cooling tower (electricity consumption for more than one year is 240000 yuan)
The water used for tower opening is open, which is easy to scale, resulting in the increase of furnace heating time and molten steel tapping time and waste of electricity. Engineering examples:
A Zhejiang boss in Shandong purchased a set of 6000KW/12 ton medium frequency induction furnace, built a 3 m/600m3 reinforced concrete pool with a depth of 3 m/600m3, and added an ordinary circular cooling tower with mud pollutants and moss grass up to 30cm thick under the pool. After completion, the cooling tower cannot be used again every three months of operation. All cooling tower fillers scale, water cannot flow through, and scale 1/4 in the circulating cooling system, the water temperature is as high as 75 ℃, and the whole system often alarms. The normal molten steel tapping time of the 6000KW-12T medium frequency electric furnace is 90 minutes, while the tapping time of the furnace is 120 minutes, which is extended by 30 minutes, which is equivalent to the 1/3 time. We do not talk about other losses such as a set of 12T electric furnace water pump and cooling tower. We only calculate that the 6000KW electric furnace will use 200 degrees of electricity more for tapping the molten steel for 30 minutes, and the calculated electricity price is 0.4 yuan/degree, every day, 800 yuan's electricity bill is wasted. According to the calculation of 300 days per year, the electricity bill for more than one year is 240000 yuan. Experts estimate that the 12T electric furnace and wearing parts together lost more than 300,000 yuan. Later, after recommend by experts, the steel mill canceled the original open cooling tower and water pool after purchasing FBN- T type closed soft water circulating cooler of our company. after our company cleaned the whole system of the steel mill with chemical agent twice and washed it three times to replace pure water, the whole system was operated normally, the discharging time was 95 minutes, and the electrical loss was controlled within the normal range.
Note: The closed cooling tower produced by our company does not have scaling phenomenon.
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II: Comparison of other costs
1. Pool cost
Open cooling tower: must dig pool.
The average price of the pool built on a stone hillside is 600 yuan/m3; The average price of the pool built on high loess land is 300 yuan/m3; The price of building a reinforced concrete pool is at least 700 yuan/m3; In summer, if the outlet temperature is 55 ℃, it can only be cooled to 45 ℃ ~ 47 ℃, and the requirement is 8 ℃ ~ 10 ℃ higher;
Closed cooling tower: no need to build a pool.
2. Equipment maintenance cost
Open cooling tower: (cooling tower filling pool)
After each three months of use of the open cooling tower, there are 30cm thick mud pollutants and moss grass under the pool, causing all the cooling tower packing to scale, water cannot flow through, and affecting production. Therefore, the cooling tower filling material must be replaced regularly and the pool must be cleaned, resulting in a corresponding increase in cost.
closed cooling tower: Closed soft water cycle, will not be due to the formation of scaling phenomenon caused by equipment maintenance and the corresponding cost of investment.
3,Floor Area:Open the towerThe pool must be dug, the pipeline connection installation is complicated, and the easy address is inconvenient.
Closed TowerThere is no need to dig a pool, the floor area is small, and there are only two flange interfaces for water inlet and outlet, which is simple to install and easy to address.
Three: water consumption comparison
Open cooling tower water consumption is: Evaporation of a floating pool of spray water
1. Open cooling towerUsedSpray waterThe drift rate2%-3%;
An actual flow rate of 200 tons/houropen cooling towerThe annual water consumption for a year is:
200 m3/h × 2% × 20h/day × 300 days/year = 24000 tons/year (maximum).
If each ton of water is 1 yuan, the water fee is 24000/year.
2,open cooling towerThe greater the flow rate, the larger the pool, the more water evaporation, the more water consumption.
Closed cooling tower water consumption is:spray pumpThe elegance of the water sprayed on the copper tube
1,closed cooling towerUsedSpray waterThe drift rate is 1 ‰-10 ‰;
An actual flow rate of 200 tons/hourclosed cooling towerThe annual water consumption for a year is:
72 m 3/h x 10 ‰ x 20 hours/day x 150 days/year = 2160 tons (maximum).
If each ton of water is 1 yuan, the water fee is 2160/year.
2,closed cooling towerNo pool, there is no evaporation of water in the pool, no water consumption.