04
2018-01
The development prospect of frequency conversion technology
With the explosive development of modern industry, global energy demand is increasing. Non renewable energy is drying up. Energy saving and consumption reduction is a common problem faced by all countries at this stage. With the development of frequency conversion technology is becoming more and more mature, widely used in all walks of life using energy-saving inverter technology, compared with the traditional fixed frequency control, frequency conversion control mode of low energy consumption, simple operation, easy maintenance, creating conditions for engine cooling with variable frequency energy saving scheme, to open the market.
In the past, the ship's cooling water pump and the engine room fan were all fully loaded at full speed according to the design, but in fact, many ships Often run at lower cruising speed, so the system running in the light load state resulting in water pump, valve, fan and wasted a lot of energy. In recent years, many cases show that the transformation through the installation of frequency conversion on the cooling water pump control system can realize the power saving of 50~80%.
Renergy low THD sea water pump VFD control system
1.Product overview
By the sharp low harmonic frequency conversion control of seawater manufacturing products using Fondants pump application converter, SIEMENS PLC S7-1200 and HMI, operation control, real-time monitoring of the whole system, the use of PID control logic in the PLC, the actual flow rate requirements, according to the load condition of the timely adjustment of the pump speed of the host, to ensure that fresh water outflow temperature central cooler the control at 36~38 DEG C, safe and effective energy saving, effectively protect the host pump operation. The typical investment recovery time of the seawater cooling system optimized by frequency converter is about 12 months.
2. Control systemThere is a master switch system in the control cabinet to control three pumps, each of which has three state positions.Manual stop automatic mode1# and 2# inverter can be used as the main driver of the system. There are 2 temperature sensors in the system. They are connected to 1# and 2# drivers to meet the redundancy control requirements. The main driver will maintain a constant LT temperature, and control all the pump speeds by master slave cascade. All the pumps in the work run at the same speed, and the system turns three pumps to balance their running time. Renergy provides a complete set of system configuration and installation and debugging.
3. Low THD sea water pump VFD control product standard parameters.
Standard Table 380V-480V 50/60HZ Air cooled IP44
Item
Pump motor capability（kw）
Type
Dimension (mm)
Weight
（kg）
Rules
W
H
D
1
30 RE-ESS30
1800
2000
600
450
ALL
2
55
RE-ESS55
2100
2000
600
520
ALL
3
75
RE-ESS75
2200
2000
600
710
ALL
4
90
RE-ESS90
2200
2000
600
710
ALL
5
120
RE-ESS120
2500
2000
800
100
ALL
6
160
RE-ESS160
2500
2000
800
1150
ALL
4. Product advantages
> energy saving, adopting frequency conversion control method, compared with traditional fixed frequency method to save 40% of the system, reduce greenhouse gas emission;
> is simple to operate and easy to maintain;
> is easy to transform, with short transformation time, low input cost and high rate of return.
> startup current is low, effective protection pump life;
> harmonic design, the whole system is reduced within 5% at run time, preventing damage to other equipment on the power grid;
> safe and reliable, redundancy design, USES the amphibious a prepared plan, prevent in the case of a frequency converter fault, in a timely manner to enable the standby pump operation, ensure the satisfaction of the cooling water flow rate, according to the requirements of water temperature and the working condition of the host used timely and automatically adjust the number of running pumps, to achieve energy saving purpose;
> Bypass Bypass is used to increase the Bypass selection of the frequency converter, so as to prevent the frequency converter from being damaged, Bypass the frequency converter to run the system and ensure the continuous and reliable operation of the system;
Case analysis:
Design temperature: 32 ℃
The actual temperature: 20 ℃
Run hours (per year) : 6000.
Electric power cost per KW/h: €0.1.
Unoptimized system energy consumption: 75KW=450.000KWh/ year.
Optimized system energy consumption: 14KW=84.000KWh/ year.
Energy saving: 80%
Annual cost savings: €36,000.
Installation of variable frequency system cost: € 32,000.
Investment recovery time: less than 12 months.
Payback amount for 2 year operation with installed
Motor(kW) =No. Of operating Pump*Pump(kW)
Motor(HP) =Motor(kW) / 0.746(kW/HP)
Fuel Consumption(kg/hr) =Fuel Consumption(kg/HP*hr)*Motor(HP)
Fuel Consumption(US$/hr) =Fuel Consumption(kg/hr)*Fuel Cost(US$/kg)
Daily Cost for Fuel(US$/day)=Fuel Cost(US＄/hr)*24hr
Annual Cost for Fuel(US$/year)=Daily Fuel Cost (US＄/day)*Operating Day(day)
Annual Saving Cost(US$) =Annual Fuel Cost without ESS(US$)-Annual Fuel Cost with ESS(US$)
Renergy
解决方案及产品
News
- 2021-01-06
