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Energy-saving speed regulation device and method for low-pressure heater drain pump

A technology of speed regulating device and drain pump, applied in electromechanical devices, pump control, mechanical energy control and other directions, can solve the problems of friction and wear, shorten the service life of equipment, increase power consumption and other problems, achieve low heat generation, convenient open-loop or closed-loop The effect of high operation and comprehensive power saving performance

Inactive Publication Date: 2021-03-09
HUANENG NANJING JINLING POWER GENERATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. When the low water level changes, a lot of energy is consumed on the throttling loss of the outlet valve, which increases the power loss
[0006] 3. During the adjustment process of the outlet valve, due to the existence of mechanical action, there is a risk of friction and wear, which shortens the service life of the equipment

Method used

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  • Energy-saving speed regulation device and method for low-pressure heater drain pump
  • Energy-saving speed regulation device and method for low-pressure heater drain pump
  • Energy-saving speed regulation device and method for low-pressure heater drain pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] see figure 1 , 2

[0046] The winding type permanent magnet speed regulating device is connected between the motor of the low-load drain pump and the water pump. The shaft of the water pump is connected with the motor of the low-load drain pump through a coupling. The coupling includes a first coupling and a second coupling. The motor of the low-load drain pump is connected to the winding permanent magnet speed regulating device through the first coupling, and the winding permanent magnet speed regulating device is connected to the water pump through the second coupling. The second coupling is provided with a collector ring and Carbon brush, when it starts synchronously, the permanent magnet rotor rotates at the same time, forming a speed difference with the winding rotor, driving the second coupling to rotate, the second coupling drives the water pump to pump water, and cuts the magnetic induction line in the winding to generate induction Electromotive force; the con...

Embodiment 2

[0049] see image 3

[0050] According to the site conditions, the original overall steel structure support and concrete foundation were remodeled accordingly, and a new drive frame and new foundation were added (that is, the original bracket at the motor support part of the low-load drainage pump was cut off, and this part of the foundation was removed. New On the concrete foundation, the new driving frame made falls on the modified bracket and the new concrete foundation surface, and the low-plus drainage pump motor, winding permanent magnet governor, coupling and water pump are installed on the new driving frame.

[0051](1) Remove the coupling of the motor of the low-load drain pump and the original motor shaft, and hoist the motor of the low-fill drain pump to a safe area;

[0052] (2) Correctly install the winding type permanent magnet speed governor, and connect and fix it through the bolt group to ensure safety and reliability;

[0053] (3) Hoist the motor of the low...

Embodiment 3

[0056] see Figure 4 , 5

[0057] According to the actual output valve throttling adjustment mode of a factory, the motor input power diagram

[0058] Under the minimum load condition, when the flow rate of the water pump is reduced to 72.61t / h by valve throttling, the input power of the motor is 178.54KW, and when the flow rate of the water pump is adjusted to 243.6t / h at the maximum load, the input power of the motor is 205.2 KW.

[0059] Based on these two working points, it is estimated that the average adjustment volume of the pump is about 80% of the rated flow rate, and the energy saving comparison before and after the transformation of the winding permanent magnet governor is estimated.

[0060] It can be seen that the flow rate Q is proportional to the speed n of the load, and the head H is proportional to the square of the speed n, and the required shaft power P is proportional to the cube of the speed n. Therefore, when the system needs 80% of the rated flow, by...

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Abstract

The invention provides an energy-saving speed regulation device and method for a low-pressure heater drain pump. The energy-saving speed regulation device for the low-pressure heater drain pump comprises a power supply, a low-pressure heater drain pump motor, a winding type permanent magnet speed regulation device and a water pump, wherein the winding type permanent magnet speed regulation deviceis located between the low-pressure heater drain pump motor and the water pump and connected with the low-pressure heater drain pump motor and the water pump through couplers; the power supply is electrically connected with the low-pressure heater drain pump motor; the winding type permanent magnet speed regulation device comprises a permanent magnet rotor, a winding rotor and a control unit; thewinding rotor does magnetic induction line cutting motion in the permanent magnet rotor; the control unit comprises an inverter cabinet and a rectification control cabinet which are electrically connected with the power supply; and the rectification control cabinet is in signal connection with the winding type permanent magnet speed regulation device and the water pump. The energy-saving speed regulation device is simple in system structure, small in size, easy to control and capable of adjusting the rotating speed of the water pump according to working condition requirements, so that the purpose of adjusting the flow of the water pump is achieved; meanwhile, throttling losses are reduced; and in addition, electric energy is recycled through an electric energy recycling device.

Description

technical field [0001] The invention relates to the field of thermal power plant equipment, in particular to an energy-saving speed regulating device and a method thereof for a low-load drainage pump realized by a winding type permanent magnetic coupling speed governor. Background technique [0002] The normal low-load drainage pump is connected by the motor and the pump with a common coupling. Since the power generation load will fluctuate greatly according to the demand of the power grid, the flow rate of the low-load drainage pump must be changed accordingly. At present, the way to adjust the flow rate of the water pump is to use the outlet valve to throttle the flow. The above-mentioned way of adjusting the valve does not contribute to the saving of electric energy. [0003] There are corresponding deficiencies in the above-mentioned device in energy saving: [0004] 1. Changing the flow rate of the low-pressure drain pump through the outlet valve throttling adjustment ...

Claims

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Application Information

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IPC IPC(8): F04B49/06F04B49/20F04B49/02H02K7/10H02K49/10H02K7/18H02P15/00
CPCF04B49/06F04B49/20F04B49/02H02K7/10H02K49/102H02K49/106H02K7/1807H02P15/00
Inventor 周家根胡海峻侯立超彭劲峰
Owner HUANENG NANJING JINLING POWER GENERATION
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