CN107661812A - A kind of power-supply system for thermal power plant coal pulverizer - Google Patents
A kind of power-supply system for thermal power plant coal pulverizer Download PDFInfo
- Publication number
- CN107661812A CN107661812A CN201610569151.8A CN201610569151A CN107661812A CN 107661812 A CN107661812 A CN 107661812A CN 201610569151 A CN201610569151 A CN 201610569151A CN 107661812 A CN107661812 A CN 107661812A
- Authority
- CN
- China
- Prior art keywords
- coal pulverizer
- power
- supply system
- pulverizer
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/0056—Other disintegrating devices or methods specially adapted for specific materials not otherwise provided for
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The technical scheme is that a kind of power-supply system for thermal power plant coal pulverizer, including coal pulverizer, described coal pulverizer is in series with frequency conversion coal pulverizer power switch by frequency converter, 6Kv active sections are connected serially to again, form the power-supply system of coal pulverizer, for the speed changing devices of the frequency converter by SCR control, frequency range is 30 ~ 50Hz；The power-supply system of the coal pulverizer also forms parallel system by frequency conversion coal pulverizer by-pass switch.Coal pulverizer uses transducer drive in the present invention, and coal pulverizer rotating speed is adjustable, coal pulverizer minimum load can be reduced into 15% nominal output by 25% nominal output, solved super（It is super）Oxide skin in criticality benchmark start-up course comes off problem；Vibration problem when ignition layer pulverizer capacity is less than 25% nominal output can effectively be prevented.
Description
Technical field
The present invention relates to a kind of power-supply system for thermal power plant coal pulverizer.
Background technology
Medium-speed pulverizer rated speed in thermal power plant is run at present, as shown in Fig. 2 coal pulverizer M passes through traditional coal-grinding electromechanical source
Switch K is connected to 6Kv active section A, coal pulverizer M contribute it is adjustable in 25% ~ 100% scope, coal pulverizer M contribute it is specified less than 25% go out
Violent vibration can be produced during power, damages coal pulverizer M, and during underrun, coal pulverizer M efficiency reduces.When super（It is super）
When criticality benchmark uses plasma ignition or tiny-oil ignition, boiler startup coal pulverizer at initial stage M contributes easily causes boiler very much greatly
Oxide skin comes off, and the coal pulverizer M minimum loads that how to degrade are the keys for preventing oxide skin from coming off.
The content of the invention
Present invention aims at coal pulverizer minimum load is reduced by reducing coal pulverizer rotating speed to reach, coal pulverizer is set to exist
Do not vibrated below 25% load, while reduce powder power consumption processed, solved super（It is super）Criticality benchmark using plasma ignition or
During tiny-oil ignition, boiler startup pulverizer capacity at initial stage is too big easily to cause boiler oxidation skin to come off problem, and spy proposes a kind of use
In the power-supply system of thermal power plant coal pulverizer.
For this technical scheme is that, a kind of power-supply system for thermal power plant coal pulverizer, including coal pulverizer,
It is characterized in that：Described coal pulverizer is in series with frequency conversion coal pulverizer power switch by frequency converter, then is connected serially to 6Kv active sections,
The power-supply system of coal pulverizer is formed,
Further improve is：The speed changing devices of the frequency converter by SCR control, frequency range is 30 ~
50Hz。
Further improve is：The power-supply system of the coal pulverizer also forms parallel connection by frequency conversion coal pulverizer by-pass switch
System.
Beneficial effect：
Coal pulverizer uses transducer drive in the present invention, and coal pulverizer rotating speed is adjustable, can by coal pulverizer minimum load by 25% it is specified go out
Power is reduced to 15% nominal output, solves super（It is super）Oxide skin in criticality benchmark start-up course comes off problem；Can effectively it prevent
Stop fire bed pulverizer capacity is less than vibration problem during 25% nominal output.
The gearshift adjustment of SCR control frequency converter, it is convenient and reliable.
The coal pulverizer when use of frequency conversion coal pulverizer by-pass switch is used for frequency converter failure starts.
Brief description of the drawings
Fig. 1 is frequency conversion coal pulverizer power supply wiring schematic diagram of the present invention.
Fig. 2 is traditional coal pulverizer power supply wiring schematic diagram.
Marked in figure；
M：Coal pulverizer, K：Traditional coal pulverizer power switch, A：6Kv active sections, B：Frequency converter, K1：Frequency conversion coal pulverizer by-pass switch,
K2：Frequency conversion coal pulverizer power switch.
Embodiment
It is of the invention as shown in Figure 1.
A kind of power-supply system for thermal power plant coal pulverizer, including coal pulverizer M described in coal pulverizer M, M pass through frequency conversion
Device B is in series with frequency conversion coal pulverizer power switch K2, then is connected serially to 6Kv active section A, forms coal pulverizer M power-supply system.
For the speed changing devices of frequency converter B by SCR control, frequency range is 30 ~ 50Hz.
Coal pulverizer M power-supply system also forms parallel system by frequency conversion coal pulverizer by-pass switch K1.
6Kv active sections A is powered by frequency conversion coal pulverizer power switch K2 to frequency converter B when specifically used, and frequency converter B is given
Coal pulverizer M powers, the rotating speed of the frequency shift coal pulverizer M by changing frequency converter B, reduces coal pulverizer M output；Frequency conversion coal-grinding
Coal pulverizer when machine by-pass switch K1 is used for frequency converter failure starts.
Claims (3)
1. a kind of power-supply system for thermal power plant coal pulverizer, including coal pulverizer, it is characterised in that：Described coal pulverizer leads to
Cross frequency converter and be in series with frequency conversion coal pulverizer power switch, then be connected serially to 6Kv active sections, form the power-supply system of coal pulverizer.
A kind of 2. power-supply system for thermal power plant coal pulverizer according to claim 1, it is characterised in that：The change
For the speed changing devices of frequency device by SCR control, frequency range is 30 ~ 50Hz.
A kind of 3. power-supply system for thermal power plant coal pulverizer according to claim 1, it is characterised in that：The mill
The power-supply system of coal machine also forms parallel system by frequency conversion coal pulverizer by-pass switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610569151.8A CN107661812A (en) | 2016-07-20 | 2016-07-20 | A kind of power-supply system for thermal power plant coal pulverizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610569151.8A CN107661812A (en) | 2016-07-20 | 2016-07-20 | A kind of power-supply system for thermal power plant coal pulverizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107661812A true CN107661812A (en) | 2018-02-06 |
Family
ID=61114166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610569151.8A Pending CN107661812A (en) | 2016-07-20 | 2016-07-20 | A kind of power-supply system for thermal power plant coal pulverizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107661812A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113333144A (en) * | 2021-07-20 | 2021-09-03 | 浙江浙能技术研究院有限公司 | Method for reducing minimum output of medium-speed coal mill based on rare earth motor frequency conversion adjustment |
| CN115400865A (en) * | 2021-05-28 | 2022-11-29 | 北京京能电力股份有限公司 | Control method for reducing minimum output of medium-speed coal mill |
-
2016
- 2016-07-20 CN CN201610569151.8A patent/CN107661812A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115400865A (en) * | 2021-05-28 | 2022-11-29 | 北京京能电力股份有限公司 | Control method for reducing minimum output of medium-speed coal mill |
| CN115400865B (en) * | 2021-05-28 | 2023-11-14 | 北京京能电力股份有限公司 | Control method for reducing minimum output of medium-speed coal mill |
| CN113333144A (en) * | 2021-07-20 | 2021-09-03 | 浙江浙能技术研究院有限公司 | Method for reducing minimum output of medium-speed coal mill based on rare earth motor frequency conversion adjustment |
| CN113333144B (en) * | 2021-07-20 | 2022-05-31 | 浙江浙能技术研究院有限公司 | Method for reducing minimum output of medium-speed coal mill based on rare earth motor frequency conversion adjustment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180206 |