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By looking through relevant material and inquiry from other power plants, our plant put forward to adopt variable frequency adjustment. Existing practice proves that this method has considerable effect of energy saving. We also made comparison and analysis between variable frequency adjustment and hydraulic coupling adjustment. We went to Haikou Power Plant and asked for information, finding following disadvantages of hydraulic coupling: complicated system, low reliability, much maintenance labour. Its advantages is low price and low cost. Through analysing actual state, the plant did not have enough installation space for hydraulic coupling. So we gave up hydraulic coupling and decided to use variable frequency adjustment.
Introduction of variable frequency adjustment
With consecutive development, variable frequency technology has reached a high level and has applied in several industries and civil facilities, such as civil variable frequency air conditioner. Its character is to utilize open/close loop control. Power cells of inverter output power required through AC-DC-AC single phase inverter circuit. Frequency inverter makes output frequency meet technics requirement, thereby reaching goal control and purpose of energy saving.
The plant selected and purchased Gozuk inverter at last. The inverter is high-high voltage source inverter, adopting cell-cascaded and multi level technology, with advantages of less harmonic, better output waveform.
Reform implementation
Because 6kV switch room has no enough installation space, plant decided to install one inverter for each surplus heat boiler. Frequency inverter has function of "one drive two". It can drive P1, P2, and has bypass function. Two boilers use two inverters. The two inverters drive four pumps.
Reconstruction began in August, 2004. The whole installation and commissioning finished within a week.
Introduction of operation mode
For above reasons, we must adopt special operation mode to ensure safe operation of water feeding system. We selected following mode eventually.
During normal operation, variable frequency pump works. System adopts HP steam drum close loop control. Water feeding governing valve is in manual control and full open. Standby pump in direct on line does not join link start, which can prevent trip-off resulted from high water level of HP steam drum when personnel does not take measure in time.
In the case of failure of inverter or running pump, it stops automatically or by manual. Personnel should start standby pump manually and adjust appropriate opening of valve as per load of that time. Exit HP steam drum three low value protection, avoid tripping caused by lag control. The gist is that surplus heat boiler has capacity of dry burning. Anyway, these ask for high requirement to personnel. When the frequency inverter is broken, original running pump can use line power to become as standby pump, thereby making high serviceability of water feeding system, reducing probabilities of stop farthest.
By looking through relevant material and inquiry from other power plants, our plant put forward to adopt variable frequency adjustment. Existing practice proves that this method has considerable effect of energy saving. We also made comparison and analysis between variable frequency adjustment and hydraulic coupling adjustment. We went to Haikou Power Plant and asked for information, finding following disadvantages of hydraulic coupling: complicated system, low reliability, much maintenance labour. Its advantages is low price and low cost. Through analysing actual state, the plant did not have enough installation space for hydraulic coupling. So we gave up hydraulic coupling and decided to use variable frequency adjustment.
Introduction of variable frequency adjustment
With consecutive development, variable frequency technology has reached a high level and has applied in several industries and civil facilities, such as civil variable frequency air conditioner. Its character is to utilize open/close loop control. Power cells of inverter output power required through AC-DC-AC single phase inverter circuit. Frequency inverter makes output frequency meet technics requirement, thereby reaching goal control and purpose of energy saving.
The plant selected and purchased Gozuk inverter at last. The inverter is high-high voltage source inverter, adopting cell-cascaded and multi level technology, with advantages of less harmonic, better output waveform.
Reform implementation
Because 6kV switch room has no enough installation space, plant decided to install one inverter for each surplus heat boiler. Frequency inverter has function of "one drive two". It can drive P1, P2, and has bypass function. Two boilers use two inverters. The two inverters drive four pumps.
Reconstruction began in August, 2004. The whole installation and commissioning finished within a week.
Introduction of operation mode
For above reasons, we must adopt special operation mode to ensure safe operation of water feeding system. We selected following mode eventually.
During normal operation, variable frequency pump works. System adopts HP steam drum close loop control. Water feeding governing valve is in manual control and full open. Standby pump in direct on line does not join link start, which can prevent trip-off resulted from high water level of HP steam drum when personnel does not take measure in time.
In the case of failure of inverter or running pump, it stops automatically or by manual. Personnel should start standby pump manually and adjust appropriate opening of valve as per load of that time. Exit HP steam drum three low value protection, avoid tripping caused by lag control. The gist is that surplus heat boiler has capacity of dry burning. Anyway, these ask for high requirement to personnel. When the frequency inverter is broken, original running pump can use line power to become as standby pump, thereby making high serviceability of water feeding system, reducing probabilities of stop farthest.
With the development of economy, energy saving and emission reduction
are key points in future. Technology of medium voltage variable
frequency is promoted increasingly. This paper demonstrates inverter
design, electrical connecting, thermal control logic configuration,
commissioning and benefits in condenser pump.
Equipment parameters
Condensing water system is middle pressure system, equipped with condenser pump. Parameters are following:
Operation state before reform
Condensing pump runs in constant speed. After being boosted pressure by pump, condensing water passes through axes and governing valve (inlet gate of deaerator, serial No C-1), then enters into deaerator. Condensing flow is controlled by governing valve opening to maintain stability of water level of deaerator. In addition, condensing water is also supplied to other auxiliary equipments. In order to avoid condensing system superpressure and cavitation during operation in low load, we design recycle pipeline. (see following figure).
Circulating governing valve C-2 cooperates with C-1 to adjust water level of deareator, keeps normal pressure for system.
Equipment parameters
Condensing water system is middle pressure system, equipped with condenser pump. Parameters are following:
Motor parameters | |||||
Model | YLKK500--4 | Rated voltage (U0) | 6kV | Cooling mode G | Q161 |
Rated power (Pdn) | 1120kW | Speed (n0) | 1491r/min | Insulation class | F |
Rated current (I0) | 124.7A | Power factor | 0.901 | IP class | IP54 |
Condenser pump parameters | |||||
Rated flow | 912.98m3/h | Rated speed | 1480r/min | Rated lift | 258.4m |
Power | 1120kW | Model | NLT350 - 400*6 |
Operation state before reform
Condensing pump runs in constant speed. After being boosted pressure by pump, condensing water passes through axes and governing valve (inlet gate of deaerator, serial No C-1), then enters into deaerator. Condensing flow is controlled by governing valve opening to maintain stability of water level of deaerator. In addition, condensing water is also supplied to other auxiliary equipments. In order to avoid condensing system superpressure and cavitation during operation in low load, we design recycle pipeline. (see following figure).
Circulating governing valve C-2 cooperates with C-1 to adjust water level of deareator, keeps normal pressure for system.
This application is about China-made cell-cascade multi-level
medium-voltage frequency inverter system on 2 # Unit Condensate water
system, makes a comparison of energy saving before and after the reform.
The results showed that the main auxiliary equipment in power plant
using medium-voltage inverter system is feasible, with quick pay-back
and other characteristics. Inverter has a positive significance to
reduce power consumption.
Preface
A Chinese factory has two units of air-cooling system of 300MW. Inverter is manufactured by Shenzhen Gozuk Co., Ltd. Pump adopt mode of "one work, one standby". Water level of deaerator is adjusted by damper. We have a discussion about inverter application according to the actual situation of # 2 Unit condenser Pump reform in the plant.
Operating Conditions
To ensure continuous and stable operation of condenser pump is an important factor of power generating units security.
Condenser system is shown in following:
Preface
A Chinese factory has two units of air-cooling system of 300MW. Inverter is manufactured by Shenzhen Gozuk Co., Ltd. Pump adopt mode of "one work, one standby". Water level of deaerator is adjusted by damper. We have a discussion about inverter application according to the actual situation of # 2 Unit condenser Pump reform in the plant.
Operating Conditions
To ensure continuous and stable operation of condenser pump is an important factor of power generating units security.
Condenser system is shown in following:
Tags: inverter, water supply