Energy-saving control method for starting and stopping of circulating water packing cooling tower fans

An energy-saving control and circulating water technology, which is applied to the energy-saving control of the start and stop of fans in cooling towers filled with circulating water, and in the field of energy-saving optimization of industrial frequency fan systems. question

Active Publication Date: 2017-05-24
WANHUA CHEM GRP
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  • Application Information

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Problems solved by technology

However, the frequency conversion system has a large investment; after it is put into use, the energy loss of the frequency converter itself will affect the energy saving effect; the variable speed operation will cause the windward angle of the fan blades to change, the fan will run away from the operating point, and the efficiency will decrease; the motor will run at a low speed outside the rated speed, and The non-linear relationship betw

Method used

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  • Energy-saving control method for starting and stopping of circulating water packing cooling tower fans
  • Energy-saving control method for starting and stopping of circulating water packing cooling tower fans
  • Energy-saving control method for starting and stopping of circulating water packing cooling tower fans

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Example Embodiment

[0313] Example 1

[0314] There are 6 fans in the circulating water field of a chemical plant. The field data collected on a certain day in summer is as follows: Ambient temperature T surroundings =30℃, relative humidity φ=74%, atmospheric pressure P=100.15kPa, dynamic pressure P at each measuring point of the fan di =13Pa-56Pa, circulating water filling cooling tower inlet temperature T o =36℃,filling cooling tower outlet temperature T i =30℃, the inlet water volume of a single tower is 4000m3 / h. Through formulas (1) to (8), finally calculate the number of different fans to turn on, and the water supply temperature that the circulating water field can reach, as shown in Table 1:

[0315] Table 1

[0316] Number of fans on Outlet temperature of circulating water field / ℃ 034 133.2 232.4 331.5 430.7 530 629.2

[0317] According to the heat load demand of the device, the optimal water supply temperature T of the circulating water field is obtained Optimal =30.1℃. According to the...

Example Embodiment

[0318] Example 2

[0319] There are 6 fans in the circulating water field of a chemical plant. The field data collected on a certain day in autumn is as follows: Ambient temperature T surroundings =19℃, relative humidity φ=60%, atmospheric pressure P=100.3kPa, dynamic pressure P at each measuring point of the fan di =15Pa-57Pa, circulating water filling cooling tower inlet temperature T o =36℃,filling cooling tower outlet temperature T i =30℃, the water volume of a single tower is 4000m 3 / h. Through formulas (1) to (8), finally calculate the number of different fans to turn on, and the water supply temperature that the circulating water field can reach, as shown in Table 2:

[0320] Number of fans on Outlet temperature of circulating water field / ℃ 032.5 131.7 230.9 330.1 429.3 528.6 627.8

[0321] According to the heat load demand of the device, the optimal water supply temperature T of the circulating water field is obtained Optimal =30.1℃. According to the outlet water tem...

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Abstract

The invention discloses an energy-saving control method for starting and stopping of circulating water field fans and aims at providing a cooling tower fan starting and stopping control technology. The method comprises the steps that firstly, actual operating parameters such as the environment temperature, the relative humidity, the atmosphere pressure, dynamic pressure of all points of the fans, circulating water inlet and outlet temperatures and the upper tower water volume are collected in real time by using special tools; secondly, according to the collected parameters, single-tower heat engineering calculation is conducted to obtain the water outlet temperature Tp of a tower when the fans are started and the water outlet temperature Tc of the tower when the fan is shut down; and finally, the water outlet temperatures in case of different numbers of fans are calculated according to the thermodynamic equilibrium, the corresponding relation between starting and stopping of the fans and the circulating water temperature is established, and by means of the automatic control technology, the purpose that the water supply temperature of circulating water is automatically adjusted through automatic starting and stopping of the fans is realized. According to the meteorological conditions and process conditions, scientific calculation, optimization and modification are conducted, the water outlet temperature of circulating water is stabilized, and the effects of stabilizing system operation, saving energy and reducing consumption are achieved.

Description

technical field [0001] The present invention relates to a fan system, in particular to a power frequency fan system optimization and energy-saving method for a circulating water mechanical draft cooling tower, more specifically, to an energy-saving control for starting and stopping the fan of a circulating water filled cooling tower method. Background technique [0002] The circulating water cooling tower is widely used in various fields such as chemical industry, iron and steel, thermoelectricity, etc. It is a kind of equipment that uses the convection method of water and air to remove the heat in water through evaporation. For cooling towers, the fan system is designed according to the maximum capacity of the process and the maximum local temperature requirements, while leaving a certain margin. After the equipment is put into operation, due to changes in atmospheric temperature, humidity, and workload, there must be deviations from the design. The fan operates under low ...

Claims

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Application Information

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IPC IPC(8): F28F27/00
CPCF28F27/003
Inventor 田宇韩冰刘畅艾丹亭张宏科姚雨华卫琦
Owner WANHUA CHEM GRP
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