CN202171257U - Running system for changing speed of GGH (gas-gas heater) rotor - Google Patents
Running system for changing speed of GGH (gas-gas heater) rotor Download PDFInfo
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- CN202171257U CN202171257U CN2011201838291U CN201120183829U CN202171257U CN 202171257 U CN202171257 U CN 202171257U CN 2011201838291 U CN2011201838291 U CN 2011201838291U CN 201120183829 U CN201120183829 U CN 201120183829U CN 202171257 U CN202171257 U CN 202171257U
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- power sources
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Abstract
The utility model relates to a running system for changing the speed of a GGH (gas-gas heater) rotor, comprising a variable frequency power source with a control interface, a variable frequency inlet switch, a variable frequency outlet switch, a drive motor, a speed reducer, a GGH rotor, a DCS (distribution control system) control cabinet and a DCS operator station, wherein the variable frequency power source with the control interface is controlled by the DCS to change the frequency so as to drive the motor to change the speed, the speed is reduced by the speed reducer so as to lead the rotation speed of the GGH rotor to be changed within the range from 0.05NH to NH, and the rotation speed is controlled in a stepless way. The utility model provides a method for intelligently controlling the rotation speed of the GGH rotor and optimizing the heat exchange capability of the GGH to lead the rotation speed and the heat exchange capability to be matched with the load and the working condition of a power station boiler when the power station boiler runs, so that the anti-blocking capability of the GGH can be improved when the smoke discharge temperature of a boiler body is overlow, the ash can be reduced in case of low rotation speed, an ash blowing effect of a GGH ash blower can be improved, and the pressure drop of a GGH heat transfer component can not be excessively raised, so that the air leakage coefficient of the GGH can be reduced, and the power consumption of a draught fan/a booster fan can be reduced.
Description
(1) technical field:
The utility model relates to the GGH rotor variable-speed operation system that a kind of station boiler desulphurization system swinging GGH uses; This system can prevent the seriously stifled ash of GGH rotor; Reduce the through-flow pressure drop of GGH rotor; Reduce desulfurization booster fan or air-introduced machine power consumption, improve boiler operation efficiency, improve the desulphurization system availability.
(2) background technology:
GGH (swinging flue gas-flue gas heat exchanger) is important cover of station boiler desulphurization system; GGH is the heat release during through the GGH heat exchange element of the higher former flue gas of the temperature utilizing to come from the outlet of boiler electric cleaner; Heat is held in heat exchange element, and former flue-gas temperature reduces the back and gets into the absorption tower; The clean flue gas process of the low temperature that comes out from absorption tower GGH absorbs heat during heat exchange element, and clean flue gas enters atmosphere through chimney after being heated the temperature rising.
GGH can improve through about 40 ℃ of the clean flue-gas temperature of desulfurization, has increased the rising height of clean flue gas greatly, has significantly reduced major pollutants (SO
2, dust and NO
X) flooring concentration, the maximum flooring concentration that GGH is set approximately only have or not GGH maximum flooring concentration 1/10th; GGH can reduce about 40 ℃ of the former flue-gas temperature that gets into the absorption tower, has significantly reduced the water consumption of desulphurization system, economizes on water in 600MW grade unit year about 500,000 tons for 2; GGH improves the clean flue-gas temperature through desulfurization, changes into dry flue gas by wet flue gas, has significantly improved the condition of work of chimney.
The GGH rotor of prior art, at station boiler from the whole service cycle of the blowing out of lighting a fire, always with rated speed N
HThe constant speed operation.The drive motors of the GGH rotor of prior art generally is furnished with variable-frequency power sources, but this variable-frequency power sources is only as soft starting device, and the angular acceleration that is used for reducing GGH rotor startup process is to reduce needed staring torque.
(3) summary of the invention:
Be provided with behind the GGH in power plant's some problems that also occur in service; Clean flue gas after the desulfurization is elevated to about 85 ℃ by about 45 ℃ in GGH; When the boiler body exhaust gas temperature is crossed when low; Can produce the concentrated acid liquid of thickness at the cold junction of GGH, these acid solutions not only have very strong corrosiveness to heat exchange element and the housing of GGH, and can adhere to the flying dust in the former flue gas; In addition, passing small slurries drop that the clean flue gas of demister carries can fouling after on the surface of heat exchange element, evaporating, and these solids can stop up the passage of heat exchange element, increase the pressure drop of GGH, increase plant consumption; The power plant that has exists the GGH pickup seriously to cause booster fan/air-introduced machine undercapacity, vibrates problems such as excessive.
It is relevant that the order of severity of problem and boiler body exhaust gas temperature, deduster export the factors such as template and material of heat transfer element of kind quantity and usefulness, GGH configuration of the clean flue gas slurries amount of carrying of former dust content, absorption tower outlet, soot blower that GGH is provided with.The boiler body exhaust gas temperature is low more, deduster exports that former dust content is high more, the few usefulness of the soot blower quantity that the clean flue gas slurries amount of carrying is more, GGH is provided with of absorption tower outlet is low, the anti-stifled rate of the heat transfer element of GGH configuration is low more, heat transfer element and diaphragm seal are corrosion-resistant poor more, and problem is just serious more.
The utility model GGH rotor variable-speed operation system comprises variable-frequency power sources (3), frequency conversion entry switch (1), frequency conversion gate out switch (2), soft entry switch (9), soft variable-frequency power sources (10), soft gate out switch (11), drive motors (4), reductor (5), GGH rotor (6), DCS switch board (7), the DCS operator station (8) of opening of opening of opening that has control interface.
The utility model GGH rotor variable-speed operation system is in the station boiler whole service cycle; Receive DCS switch board (7) control; Change the output frequency of the variable-frequency power sources (3) that has control interface; Drive motors (4) changes rotating speed thereupon, and the rotating speed of rotor (6) that makes rotary regenerative air preheater through reductor (5) is at 0.05N
HTo N
H(rated speed) interval variable-speed operation, stepless controlled.DCS operator station (8) is the man-machine interface of GGH rotor variable-speed operation system.
The variable-frequency power sources (3) of band control interface has vector controlled characteristic or Direct Torque Control characteristic, is furnished with cooling fan, to obtain necessary detent torque, and under slow-speed of revolution high torque (HT) condition, can the long period safe operation.The band control interface variable-frequency power sources (3) with the rotating speed control interface can be the analog quantity interface; Like 4_20mA, 0_10V; Also can be digital interface, perhaps have 2 class interfaces simultaneously like RS485, DeviceNet, Profibus-DP, Modbus, CAN, SIMOLINK.
The utility model GGH rotor variable-speed operation system has kept soft variable-frequency power sources (10), soft entry switch (9), the soft gate out switch (11) that opens of opening of opening that is used for soft start.When being with variable-frequency power sources (3) fault of control interface, at control down coversion entry switch (1), frequency conversion gate out switch (2) separating brake of DCS switch board (7); Soft entry switch (9), soft gate out switch (11) combined floodgate that opens of opening kept GGH and moved continuously.
The utility model GGH rotor variable-speed operation system provide a kind of at station boiler from the whole service cycle of the blowing out of lighting a fire, Based Intelligent Control GGH rotor speed makes it the technical scheme that is complementary with station boiler load, operating mode with the exchange capability of heat of optimizing GGH.The utility model GGH rotor variable-speed operation system provides a kind of GGH to abandon and has stayed the 3rd kind of technical scheme beyond the battle, has special meaning to disposing the active service unit that GGH endures the hardship of the stifled ash of GGH again to the fullest extent.
The utility model GGH rotor variable-speed operation system both can be used for the station boiler GGH of prior art is transformed, and also can be used for designing the GGH of a new generation.
Adopt the benefit of the utility model to be:
Can be controlled the exchange capability of heat of reduction GGH, improve GGH and cross the anti-stifled ability when low at the boiler body exhaust gas temperature;
Deashing under the slow-speed of revolution can improve the grey effect of blowing of GGH soot blower, prevents that the pressure drop of GGH heat transfer element from excessively raising, thereby reduces the GGH air leakage coefficient, reduces air-introduced machine/booster fan power consumption;
Can reduce the driving power consumption of GGH rotor;
Can prolong the service life of GGH rotor bearing;
Can reduce carrying of GGH rotor leaks out;
Can the GGH of active service be undergone technological transformation, improve its anti-stifled ash, erosion-resisting ability, effectively prolong the service life of the heat transfer element of GGH, low input, high benefit.
(4) description of drawings:
Fig. 1 GGH rotor variable-speed operation system construction drawing
Do not mark speed probe, temperature sensor, differential pressure pick-up etc. and signal cable thereof among Fig. 1; Do not mark DCS switch board (7) to frequency conversion entry switch (1), frequency conversion gate out switch (2), soft entry switch (9), the soft control relation that opens gate out switch (11) of opening, too numerous and diverse to avoid system construction drawing.
Two-wire bar line between drive motors (4), reductor (5), the GGH rotor (6) is represented the mechanical connection relation.
Reference numeral in Fig. 1:
1 frequency conversion entry switch, 2 frequency conversion gates out switch 3 have the variable-frequency power sources of control interface
4 drive motors, 5 reductors, 6 GGH rotors
7 DCS switch boards, 8 DCS operator stations, the 9 soft entry switches that open
The 10 soft variable-frequency power sources 11 soft gates out switch that open that open
(5) specific embodiment:
In order better to understand the technical scheme of the utility model, describe the embodiment that the utility model provides in detail below in conjunction with accompanying drawing:
The variable-frequency power sources (3) of frequency conversion entry switch (1), band control interface, frequency conversion gate out switch (2) series connection; Softly open entry switch (9), softly open variable-frequency power sources (10), softly open gate out switch (11) series connection; Variable-frequency power sources (3), frequency conversion gate out switch (2) string of frequency conversion entry switch (1), band control interface with softly open entry switch (9), softly open variable-frequency power sources (10), the soft gate out switch (11) that opens is gone here and there parallelly connected again.
Softly open entry switch (9), softly open variable-frequency power sources (10), softly open the safety guarantee of variable-frequency power sources (3) that gate out switch (11) is the band control interface; Frequency conversion entry switch (1), frequency conversion gate out switch (2) are in the closing position when normally moving for the variable-frequency power sources (3) of band control interface, and soft entry switch (9), the soft gate out switch (11) that opens of opening is at sub-gate position; During variable-frequency power sources (3) fault of band control interface, frequency conversion entry switch (1), frequency conversion gate out switch (2) separating brake softly open entry switch (9), the soft gate out switch (11) that opens closes a floodgate the still available operation of keeping GGH.The variable-frequency power sources (3), frequency conversion entry switch (1), frequency conversion gate out switch (2) of band control interface, softly open entry switch (9), the soft gate out switch (11) that opens all receives DCS switch board (7) monitoring.
The variable-frequency power sources (3) of band control interface has the vector controlled characteristic, is furnished with cooling fan, the 4_20mA analog signals control that output frequency is come by DCS switch board (7); Pass through the mutual communication of digital interface RS485 between the variable-frequency power sources (3) of DCS switch board (7) and band control interface simultaneously, the variable-frequency power sources (3) of band control interface receives DCS switch board (7) monitoring.
The utility model patent GGH rotor variable-speed operation system; In the station boiler whole service cycle; Receive DCS switch board (7) control; The output frequency that changes the variable-frequency power sources (3) have control interface changes between 2.5Hz to 50Hz, and drive motors (4) changes rotating speed thereupon, and the rotating speed of rotor (6) that makes rotary regenerative air preheater through reductor (5) is at 0.05N
HTo N
H(rated speed) interval variable-speed operation, stepless controlled.DCS operator station (8) is the man-machine interface of GGH rotor variable-speed operation system.
In DCS switch board (7) and DCS operator station (8), include following hardware and software functional module:
A.GGH rotor speed and rotor angle acceleration analysis and display module;
Output frequency display unit by near the variable-frequency power sources (3) of switch, pulse shaping circuit, constant frequency impulse generator, counter, calculation display unit, band control interface is formed.
B. deduster exports former flue-gas temperature, GGH exports former smoke temperature measurement and display module;
The clean flue-gas temperature of c.GGH import, GGH export clean smoke temperature measurement and display module;
D.GGH former fume side import and export differential pressure measurement and display module;
E.GGH clean fume side import and export differential pressure measurement and display module;
F.GGH rotor reduction of speed module;
Can select GGH rotor reduction of speed mode, reduction of speed speed, reduction of speed desired value.Record and each cigarette temperature Vs speed curves of demonstration.
The primary/secondary drive motors electric current of g.GGH rotor, variable-frequency power sources output current are measured and display module;
Whether observation, confirmation, record GGH rotor and fan type sealing plate have touching.
H.GGH rotor speed and GGH soot blower Coordination module;
Hot deashing submodule
Air preheater rotor rotating speed when optimizing the work of GGH soot blower, the blanking time of blowing the ash duration at every turn, blowing ash for twice, calculate and record GGH soot blower energy consumption.
The deashing of record GGH rotor when showing the work of gas impulse formula soot blower with treat the deashing zone.
Provide the GGH soot blower from dropping into and blowing ash and accomplish signal.
I.GGH rotor speed optimizing module;
The optimizing target: * GGH rotor dust stratification is slight, controlled.
* air-introduced machine, booster fan long period average current drain are minimum.
* former flue gas GGH outlet temperature long period mean value is minimum.
* GGH soot blower long period average power consumption is minimum.
J. frequency conversion entry switch (1), frequency conversion gate out switch (2), soft entry switch (9), soft gate out switch (11) control module that opens of opening;
When being with variable-frequency power sources (3) fault of control interface, frequency conversion entry switch (1), frequency conversion gate out switch (2) separating brake, soft entry switch (9), soft gate out switch (11) combined floodgate that opens of opening.
K. communication module;
* with the existing DCS shared portion measuring point data of station boiler.
* with the variable-frequency power sources that has control interface (3) communication, instruction has the variable-frequency power sources (3) of control interface and exports needed frequency, keeps watch on the working status parameter of the variable-frequency power sources (3) that has control interface.
* with the communication of GGH soot blower stored program controlled, the usefulness of coordination optimization GGH soot blower.
L.GGH rotor axial section heat transfer element Temperature Distribution module;
The axial section heat transfer element temperature profile of cigarette side diverse location, the pseudo-colours temperature profile by the former fume side import and export of actual measurement GGH cigarette temperature gets through calculating is used to assess the anti-stifled grey ability under the GGH rotor different rotating speeds.
M.GGH rotor startup and stopping modular;
The selection and the control of startup and stop mode.
The switching of main and auxiliary preheater rotor driven motor.
The operations staff can monitor and optimizes at the running speed of station boiler from the whole service cycle of the blowing out of lighting a fire GGH rotor (6) through DCS operator station (8) and DCS switch board (7).
The hardware and software of DCS switch board (7) and DCS operator station (8) are generally selected the homologous series product of the DCS used with station boiler (dcs) same provider for use, so that communication and data sharing.As a rule, the hardware and software spare space that DCS switch board (7) and DCS operator station (8) can utilize the used DCS of station boiler to have is to reduce the power station investment.
Claims (5)
1. a GGH rotor variable-speed operation system is characterized in that: comprise the variable-frequency power sources (3), frequency conversion entry switch (1), frequency conversion gate out switch (2), soft entry switch (9), soft variable-frequency power sources (10), soft gate out switch (11), drive motors (4), reductor (5), GGH rotor (6), DCS switch board (7), the DCS operator station (8) of opening of opening of opening that have control interface; The variable-frequency power sources (3) of frequency conversion entry switch (1), band control interface, frequency conversion gate out switch (2) series connection; Softly open entry switch (9), softly open variable-frequency power sources (10), softly open gate out switch (11) series connection; Variable-frequency power sources (3), frequency conversion gate out switch (2) string of frequency conversion entry switch (1), band control interface with softly open entry switch (9), softly open variable-frequency power sources (10), the soft gate out switch (11) that opens is gone here and there parallelly connected again; In the station boiler whole service cycle; Receive DCS switch board (7) control, change the output frequency of the variable-frequency power sources (3) that has control interface, drive motors (4) changes rotating speed thereupon; The rotating speed that makes GGH rotor (6) through reductor (5) is in the interval change of 0.05NH to NH, and is stepless controlled; DCS operator station (8) is the man-machine interface of GGH rotor variable-speed operation system.
2. GGH rotor variable-speed operation according to claim 1 system is characterized in that: the variable-frequency power sources (3) of band control interface has vector controlled characteristic or Direct Torque Control characteristic, is furnished with cooling fan; With control interface can be analog quantity 4_20mA, 0_10V interface, also can be digital interface, RS485, DeviceNet, Profibus-DP, Modbus, CAN, SIMOLINK perhaps have 2 class interfaces simultaneously.
3. GGH rotor variable-speed operation according to claim 1 system; It is characterized in that: softly open entry switch (9), softly open variable-frequency power sources (10), softly open the safety guarantee of variable-frequency power sources (3) that gate out switch (11) is the band control interface; Frequency conversion entry switch (1), frequency conversion gate out switch (2) are in the closing position when normally moving for the variable-frequency power sources (3) of band control interface, and soft entry switch (9), the soft gate out switch (11) that opens of opening is at sub-gate position; During variable-frequency power sources (3) fault of band control interface, frequency conversion entry switch (1), frequency conversion gate out switch (2) separating brake softly open entry switch (9), the soft gate out switch (11) that opens closes a floodgate the still available operation of keeping GGH; The variable-frequency power sources (3), frequency conversion entry switch (1), frequency conversion gate out switch (2) of band control interface, softly open entry switch (9), the soft gate out switch (11) that opens all receives DCS switch board (7) monitoring.
4. GGH rotor variable-speed operation according to claim 1 system is characterized in that: include rotor speed and rotor angle acceleration analysis and display module at DCS switch board (7) and DCS operator station (8); Deduster exports former flue-gas temperature, GGH exports former smoke temperature measurement and display module; The clean flue-gas temperature of GGH import, GGH export clean smoke temperature measurement and display module; GGH former fume side import and export differential pressure measurement and display module; GGH clean fume side import and export differential pressure measurement and display module; GGH rotor reduction of speed module; The primary/secondary drive motors electric current of GGH rotor, variable-frequency power sources output current are measured and display module; GGH rotor speed and GGH soot blower Coordination module; GGH rotor speed optimizing module; Frequency conversion entry switch (1), frequency conversion gate out switch (2), soft entry switch (9), soft gate out switch (11) control module that opens of opening; Communication module; GGH rotor axial section heat transfer element Temperature Distribution module; GGH rotor startup and stopping modular.
5. GGH rotor variable-speed operation according to claim 1 system, it is characterized in that: GGH is provided with GGH former fume side import and export differential pressure transmitter and the clean fume side import and export of GGH differential pressure transmitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201838291U CN202171257U (en) | 2011-06-02 | 2011-06-02 | Running system for changing speed of GGH (gas-gas heater) rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201838291U CN202171257U (en) | 2011-06-02 | 2011-06-02 | Running system for changing speed of GGH (gas-gas heater) rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202171257U true CN202171257U (en) | 2012-03-21 |
Family
ID=45829452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201838291U Expired - Fee Related CN202171257U (en) | 2011-06-02 | 2011-06-02 | Running system for changing speed of GGH (gas-gas heater) rotor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202171257U (en) |
-
2011
- 2011-06-02 CN CN2011201838291U patent/CN202171257U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120321 Termination date: 20140602 |