Automatic temperature control apparatus of large cooling column group

Abstract

The invention relates to an automatic temperature control device of a large cooling tower group which comprises a plurality of blowers. The high temperature cooling water of a high temperature working machine is cooled by running through the blower and imported into a cold water pool to save, and the water is pumped to the high temperature working machine from the cold water pool to achieve the recycling of the cooling water, one of the plurality of the blowers is selected as a main blower, the others are the assistant blowers, the main contactors of the blower motor are connected in parallel and connected with a soft starter which is connected with and controlled by a programmable controller, a temperature sensor is arranged into the cold water pool, the signal of the temperature sensor is output to a PID digital regulator which inputs the signal to the programmable controller and a converter which is connected with the main blower, the assistant blowers are connected with the soft starter and a working frequency power supply, and the programmable controller accomplishes the conversion and the control. The device has the advantages of convenient control, gentle start and stop, economical and practical properties, and environmental protection and the device can also save power by more than 30 percent.

Description

technical field [0001] The invention relates to automatic control, in particular to an automatic temperature control device for a cooling tower group used in the test run of a high-power marine diesel engine. Background technique [0002] During the test run of the high-power marine diesel engine, the cooling water of the cooler, the cooling water of the air cooler and the cooling water of the hydraulic dynamometer continuously enter the hot water pool. The recirculation is used for the test run of the diesel engine. [0003] As the output power of marine high-power diesel engines continues to increase, the cooling water required for diesel engines to run on test benches also increases accordingly. The capacity of the cooling tower fan used in the past can no longer meet the operation requirements of the cooling tower. Therefore, a combination of several cooling tower fans with large capacity was selected to meet the operation requirements of the cooling tower. The cooling...

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Problems solved by technology

[0004] The disadvantages of this control method in the prior art: the start and stop of the motor have a great impact on the pipeline and the power grid, which may easily cause equipment damage; since the motor is always on from the beginning to the end of the test run, energy is wasted in vain

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