1.project overview

Shandong Road and Bridge nuclear energy heating Laiyang, Rushan (Haiyang) project, Haifa Nuclear energy long distance steam pipeline network project, is a major infrastructure project construction list project in Shandong Province, "zero carbon" heating project, to serve the old and new energy conversion and green, low-carbon and high-quality development of Shandong Province is of great significance. Through nuclear heating, this project can significantly reduce carbon dioxide emissions in the surrounding cities of Haiyang and effectively improve the atmospheric environment and Marine ecological environment during the district heating season.

2.Circulating water pump in nuclear heating problems

The problem of hydrostatic pressure in the heating system: the heating system can only run when it is full of water. Therefore, the circulating pressure is only grams take pipe network resistance; However, some designs also include the hydrostatic pressure in the circulation resistance, which will of course increase the capacity of the circulation pump.

Hydraulic balance of the pipe network system: Because the hydraulic balance calculation of the indoor and outdoor pipe network may be fully considered during the design, and the initial adjustment after construction will often cause hydraulic imbalance and the phenomenon of heat before and after heat. Many engineering units think that it is the force of the pump
The amount can not be reached, and the method of increasing the pressure of the pump is used. Energy saving of circulating water pump: In order to overcome the excessive capacity of circulating water pump, the national "Energy saving Design Standard for Civil Buildings" has specific provisions.

3.Application characteristics of FGI FD5000 medium voltage drive

The harmonic index is lower than IEEE519-1992 harmonics standard, which adopts no velocity vector control technology and power unit series multilevel technology.
Input power factor is high, output waveform quality is good, do not need to use input harmonic filter, power factor compensation device and output filter;
There is no harmonic caused by the motor additional heat and torque ripple, noise, output dv/dt, common mode voltage and other problems, you can use ordinary asynchronous motors.

4.application performance

Maintenance is reduced. After adopting variable frequency speed regulation, most of the time, the running speed of the pump is much lower than the rated speed of the pump. Due to the slow start of the pump and the reduction of the speed, the wear of the pump component seals and bearings is reduced, and the life of the pump is correspondingly extended.
Reduced work intensity. The use of frequency conversion constant pressure closed-loop regulation does not need to adjust the outlet return valve, the operation work is changed from manual to automatic, monitoring, and fully realize the unmanned operation of oil field production, greatly reducing the labor intensity of workers.
The on-site noise is greatly reduced, and the operating environment of the site is effectively improved
Good screening; It is convenient to realize automatic management of pump unit control system.