Control Analysis of Cooling Tower

Uno Cooling Technology will introduce the control analysis of cooling towers to you.

The cooling tower is a comprehensive product integrating a variety of disciplines such as aerodynamics, thermodynamics, fluids, chemistry, biochemistry, materials science, static and dynamic structural mechanics, and processing technology. Water quality is a multi-variable function, and cooling is a multi-factor, multi-variable and multi-effect synthesis process

The analysis of the fan energy-saving controller puts forward that the purpose of the fan energy-saving control management is to realize the closed-loop automatic control of the fan operation. The temperature of the water supply is preset according to the needs of production. The influence of the climate and meteorological environment on the water temperature and the influence of the change of the system heat exchange conditions on the water temperature are reflected in time by the measured value of the temperature sensor, and the energy consumption of the cooling equipment can be adjusted to stabilize. Water temperature, realize self-control energy saving.

The purpose of the fan safety monitoring and management is to automatically detect the vibration, oil temperature, and oil level changes, display and record them, and at the same time, alarm and stop the fans whose detection value exceeds the limit, so as to In order to achieve the purpose of safe and stable operation of the fan, reduce or even eliminate the occurrence of damage to the fan. According to the actual situation of on-site management, it is determined that the three parameters of "fan vibration", "lubricating oil temperature" and "gearbox oil level" are important operating parameters to ensure the safety of the fan [3]. A total of 15 design parameters such as "measurement range", "measurement accuracy" and "inspection time" have been determined for R&D and production. The system was tested in the circulating water field once in September 1993, and was named "KR-939 Fan Safety Monitor".

The cooling tower system uses multi-parameter combination probe technology, digital command coding technology and computer network management technology. The three-parameter combination probe is installed on the fixed seat of the berth ruler of the fan gear box, and its probe rod is directly inserted into the lubricating oil, which directly converts the oil temperature, berth and equipment vibration values ​​in the gear box into electrical signals, and transmits them to the remote control room. Fan safety monitor. Each safety monitor can be connected with 8 combined probes with a four-core cable to monitor the operating parameters of 8 fans in real time, and complete digital display at the same time. Over-limit alarm, over-limit shutdown and other multi-phase functions. After many tests and modification designs, it has been successfully applied to the equipment production site, and various parameters have reached the predetermined design requirements.

To realize computer network control analysis, it can be connected with a management computer through a four-core communication cable (RS-422 standard serial interface), and the computer can be a general-purpose PC or an industrial computer. When equipped with the corresponding configuration monitoring and management software (DCS-900 software), it can realize network control with multiple KR-933 and KR-939 monitors.

Ensure the safe operation of the fan

According to field experience, the characteristics of the oil temperature, oil level and vibration curve of the fan in good condition are as follows:

①Oil temperature curve: It gradually rises and falls from the time of starting and stopping, and it becomes a smooth curve that approximates a straight line in about 1 hour.

② Berth curve: whether the machine is turned on or not, it should be approximately a horizontal straight line.

③ Vibration curve: In the power-on state, around a virtual straight line, make an irregular curve of up and down narrow oscillation.

The above is the relevant content introduced by Uno Cooling Technology.