CN203452857U - Over-speed protection equipment for turbine - Google Patents
Over-speed protection equipment for turbine Download PDFInfo
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- CN203452857U CN203452857U CN201320496513.7U CN201320496513U CN203452857U CN 203452857 U CN203452857 U CN 203452857U CN 201320496513 U CN201320496513 U CN 201320496513U CN 203452857 U CN203452857 U CN 203452857U
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- rotating speed
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Abstract
The utility model discloses over-speed protection equipment for a turbine. The over-speed protection equipment comprises a speed measurement device, a relay and an electromagnetic valve, wherein the speed measurement device is used for monitoring whether the turbine is over-speed; the relay is connected with the speed measurement device and is used for sending a control instruction according to a turbine over-speed signal which is sent by the speed measurement device; the electromagnetic valve is connected with the relay and the turbine and is used for controlling the turbine to stop rotating according to the control instruction. The relay is additionally arranged in a turbine protection system, and the speed measurement device is optimized, so that when the turbine is over-speed, the over-speed protection equipment for the turbine can operate more accurately and timely, and the reliability of the over-speed protection equipment is improved.
Description
Technical field
The utility model relates to overspeed protection technology, particularly, relates to a kind of feed pump turbine overspeed protective device.
Background technique
Feed water pump is one of Important Auxiliary equipment of power station, and unit power consumption is maximum, therefore in order to improve Economy, adopts steam feed pump more, coordinates electrically driven feedpump as start and stop and standby.At present, many engineerings no longer configure startup electrically driven feedpump, so stable, the reliable operation particular importance of feed pump turbine.Yet the feed pump turbine that at present a lot of manufacturers manufacture only has Electric Overspeed Protection Control protection, or the over-speed protection function of feed pump turbine all realized by systems soft ware, there is no overspeed protection hardware-in-the-loop or mechanical overspeed protection control device.In addition, also there are many imperfection parts in the overspeed protection logic of some feed pump turbines, and this makes system have the risk of mistake action and rejecting action, and the overspeed protection ，Wei power plant operation that can not realize safely and reliably feed pump turbine brings potential safety hazard.
Model utility content
The purpose of this utility model is to provide a kind of turbine over equipment, and this equipment is provided with overspeed protection hardware-in-the-loop in feed pump turbine, has improved feed pump turbine overspeed protection reliability.
To achieve these goals, the utility model provides a kind of turbine over equipment, and this equipment comprises: speed measurement device, and whether this speed measurement device is used for monitoring described steam turbine and exceeds the speed limit; Relay, is connected with described speed measurement device, for the Steam Turbine Over-speed Accident signal sending according to described speed measurement device, sends control command; And solenoid valve, be connected with described steam turbine with described relay, for stop described steam turbine according to described control command, rotate.
Preferably, this equipment comprises two described relays that are connected in parallel and two described solenoid valves that are connected in parallel.
Preferably, described speed measurement device comprises: velocity measurement plate, for measuring the rotating speed of described steam turbine; And comparator, be connected with described velocity measurement plate, for measured rotating speed and the predefined rotary speed threshold value of described velocity measurement plate compared, when being greater than described rotary speed threshold value, exports measured rotating speed Steam Turbine Over-speed Accident signal.
Preferably, described speed measurement device comprises: three velocity measurement plates, for measuring respectively the rotating speed of described steam turbine; Three comparators, are connected with described three velocity measurement plates respectively, for measured rotating speed and the predefined rotary speed threshold value of described velocity measurement plate compared; And hypervelocity information module, the input end of described hypervelocity information module is connected with described three comparators respectively, the output terminal of described hypervelocity information module is connected with described relay, and the information module that exceeds the speed limit described in when the judgement of at least two comparators show that measured rotating speed is greater than described rotary speed threshold value in described three comparators sends described Steam Turbine Over-speed Accident signal to described relay.
Preferably, described speed measurement device also comprises: rotating speed card, and for measuring the overspeed situation of described steam turbine, described rotating speed card is connected with described relay, and the rotating speed that records described steam turbine when described rotating speed card is exported Steam Turbine Over-speed Accident signal during for hypervelocity.
Preferably, described speed measurement device also comprises: three rotating speed cards, are respectively used to measure the overspeed situation of described steam turbine; And hypervelocity information module, the input end of described hypervelocity information module links and connects with described three rotating speeds respectively, the output terminal of described hypervelocity information module is connected with described relay, and the rotating speed that at least two rotating speed cards record described steam turbine in described three the rotating speed cards information module that exceeds the speed limit described in during for hypervelocity sends Steam Turbine Over-speed Accident signal to described relay.
Preferably, described speed measurement device comprises: three velocity measurement plates, for measuring respectively the rotating speed of described steam turbine; Three comparators, are connected with described three velocity measurement plates respectively, for measured rotating speed and the predefined rotary speed threshold value of described velocity measurement plate compared; The first hypervelocity information module, the input end of described the first hypervelocity information module is connected with described three comparators respectively, when in described three comparators, the judgement of at least two comparators show that measured rotating speed is greater than described rotary speed threshold value described in first information module that exceeds the speed limit export described Steam Turbine Over-speed Accident signal; Three rotating speed cards, are respectively used to measure the overspeed situation of described steam turbine; The second hypervelocity information module, the input end of described the second hypervelocity information module links and connects with described three rotating speeds respectively, the rotating speed that at least two rotating speed cards record described steam turbine in described three rotating speed cards during for hypervelocity described in the second hypervelocity information module output Steam Turbine Over-speed Accident signal; And or logical device, the output of described the first hypervelocity information module and described the second hypervelocity information module is as the input of described or logical device, output described or logical device is connected to described relay.
Preferably, hypervelocity information module comprises: three pairs of control switchs that are connected in parallel, between every pair of control switch, be connected in series, described three pairs of control switchs are as follows with being connected of rotating speed card or comparator: first pair of control switch control end is connected with the first rotating speed card or comparator, the second rotating speed card or comparator respectively; The control end of second pair of control switch is connected with the second rotating speed card or comparator, the 3rd rotating speed card or comparator respectively; The control end of the 3rd pair of control switch is connected with the first rotating speed card or comparator, the 3rd rotating speed card or comparator respectively; Wherein, the rotating speed that obtains described steam turbine at described rotating speed card or comparator is during for hypervelocity, the control switch being connected with this rotating speed card or comparator obtains electric, so that the rotating speed that at least two rotating speed cards or comparator record described steam turbine in three rotating speed cards or comparator sends described Steam Turbine Over-speed Accident signal to described relay during for hypervelocity.
Pass through technique scheme; the utility model has increased the hardware-in-the-loop of overspeed protection in Protection System of Turbin, in addition speed measurement device is optimized, and makes when Steam Turbine Over-speed Accident; steam turbine protection equipment can move more accurately and timely, and has strengthened the reliability of equipment.
Other feature and advantage of the present utility model partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide further understanding of the present utility model, and forms a part for specification, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
Fig. 1 has shown the structured flowchart of the turbine over equipment that the utility model provides;
Fig. 2 has shown the structural representation of the speed measurement device that the first mode of execution of the present utility model provides;
Fig. 3 has shown the structural representation of the speed measurement device that the second mode of execution of the present utility model provides;
Fig. 4 has shown the structural representation of the speed measurement device that the 3rd mode of execution of the present utility model provides; And
Fig. 5 has shown the schematic diagram of the hypervelocity information module that mode of execution of the present utility model provides.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the utility model, is not limited to the utility model.
Fig. 1 has shown the structured flowchart of the turbine over equipment that the utility model provides, and as shown in Figure 1, this equipment comprises speed measurement device 1, relay 2 and solenoid valve 3.Whether speed measurement device 1 exceeds the speed limit for monitoring steam turbine, the in the situation that of Steam Turbine Over-speed Accident, this speed measurement device 1 sends Steam Turbine Over-speed Accident signal, relay 2 is connected with speed measurement device 1, for the Steam Turbine Over-speed Accident signal sending according to speed measurement device 1, send control command, in the situation that relay 2 receives the Steam Turbine Over-speed Accident signal that speed measurement device 1 sends, this relay 2 sends and stops the control command that steam turbine rotates, solenoid valve 3 is connected with steam turbine (not shown) with relay 2, stops steam turbine rotating for the control command of sending according to relay 2.
Generally, relay 2 is normally opened relay, in the situation that speed measurement device 1 sends Steam Turbine Over-speed Accident signal and exports high level because recording turbine speed hypervelocity, this relay 2 obtains electric, it is electric that thereby the solenoid valve being connected with this relay 23 obtains, this closes the oil circuit throttle of steam turbine and pitch draining, thereby steam turbine is out of service.
The turbine over equipment providing in order to optimize the utility model; this equipment can comprise two relays that are connected in parallel 2 and two solenoid valves that are connected in parallel 3, like this can be therein in relay 2 or one of them solenoid valve 3 situation about breaking down whole equipment still keep normal operation.
Speed measurement device 1 in the turbine over equipment that the utility model provides can be realized the monitoring whether steam turbine is exceeded the speed limit by velocity measurement plate 11 and comparator 12; velocity measurement plate 11 is for the rotating speed of MEASUREMENT OF STEAM turbine; comparator 12 is connected with velocity measurement plate 11; for rotating speed and the predefined rotary speed threshold value that velocity measurement plate 11 is recorded, compare; when measured rotating speed is greater than this predefined rotary speed threshold value, export Steam Turbine Over-speed Accident signal, namely when the over speed of rotation of steam turbine, speed measurement device 1 sends Steam Turbine Over-speed Accident signal.
Fig. 2 has shown the structural representation of the speed measurement device that the utility model mode of execution provides, as shown in Figure 2, speed measurement device 1 comprises three velocity measurement plates 11, three comparators 12 and the information module 13 that exceeds the speed limit, the rotating speed of three velocity measurement plate 11 difference MEASUREMENT OF STEAM turbines, three comparators 12 are connected with three velocity measurement plates 11 respectively, and measured rotating speed and the predefined rotary speed threshold value of velocity measurement plate 11 compared, the input end of hypervelocity information module 13 is connected with three comparators 11 respectively, the output terminal of hypervelocity information module 13 is connected with relay 2, in the situation that at least two comparator 12 judgements show that measured rotating speed is greater than this hypervelocity information module 13 of predefined rotary speed threshold value and sends Steam Turbine Over-speed Accident signal to relay 2 in three comparators 12.
Specifically, three velocity measurement plates 11 are respectively the first velocity measurement plate 11, the second velocity measurement plate 11 and the 3rd velocity measurement plate 11, three comparators 12 are respectively the first comparator 12, the second comparator 12 and the 3rd comparator 12, wherein, the first velocity measurement plate 11 is connected with the first comparator 12, the second velocity measurement plate 11 is connected with the second comparator 12, the 3rd velocity measurement plate 11 is connected with the 3rd comparator 12, the first comparator 12 compares measured rotating speed and the predefined rotary speed threshold value of the first velocity measurement plate 11, in the situation that the measured rotating speed of the first velocity measurement plate 11 is greater than predefined rotary speed threshold value, the first comparator 12 output Steam Turbine Over-speed Accident signals, the second comparator 12 compares measured rotating speed and the predefined rotary speed threshold value of the second velocity measurement plate 11, in the situation that the measured rotating speed of the second velocity measurement plate 11 is greater than predefined rotary speed threshold value, the second comparator 12 output Steam Turbine Over-speed Accident signals, the 3rd comparator 12 compares measured rotating speed and the predefined rotary speed threshold value of the 3rd velocity measurement plate 11, in the situation that the measured rotating speed of the 3rd velocity measurement plate 11 is greater than predefined rotary speed threshold value, the 3rd comparator 12 output Steam Turbine Over-speed Accident signals, the in the situation that of having two comparators, 12 output Steam Turbine Over-speed Accident signal at least in the first to the 3rd comparator 12, hypervelocity information module 13 sends Steam Turbine Over-speed Accident signal to relay 2.
On the other hand; speed measurement device 1 in the turbine over equipment that the utility model provides can also be realized the monitoring whether steam turbine is exceeded the speed limit by rotating speed card 14; rotating speed card 14 is for the overspeed situation of MEASUREMENT OF STEAM turbine; this rotating speed card 14 is connected with relay 2, in the situation that rotating speed card 14 records the rotating speed of steam turbine, for exceeding the speed limit, exports Steam Turbine Over-speed Accident signal.
Fig. 3 has shown the structural representation of the speed measurement device that the second mode of execution of the present utility model provides, as shown in Figure 3, speed measurement device 1 comprises three rotating speed cards 14 and hypervelocity information module 15, the overspeed situation of three rotating speed card 14 difference MEASUREMENT OF STEAM turbines, the input end of hypervelocity information module 15 is connected with three rotating speed cards 14 respectively, the output terminal of hypervelocity information module 15 is connected with relay 2, in the situation that the rotating speed that in three rotating speed cards 14, at least two rotating speed cards 14 record steam turbine is the information module 15 that exceeds the speed limit, to relay 2, sends Steam Turbine Over-speed Accident signal.
The utility model tests the speed by three speed measuring points are set, and according to taking to shut down action during at least two signal indications hypervelocity in record three signals, and the detection of having carried out signal of interest is carried out three and got two standard, has improved reliability of operation.
Under preferable case, speed measurement device 1 in the turbine over equipment that the utility model provides can also pass through velocity measurement plate 11, comparator 12, rotating speed card 14 and or logical device jointly realize the monitoring whether steam turbine is exceeded the speed limit, specifically, the rotating speed of velocity measurement plate 11 MEASUREMENT OF STEAM turbines, comparator 12 is connected with velocity measurement plate 11, for measured rotating speed and the predefined rotary speed threshold value of velocity measurement plate 11 compared, in the situation that measured rotating speed is greater than this predefined rotary speed threshold value comparator 12 output Steam Turbine Over-speed Accident signals, simultaneously, the also overspeed situation of MEASUREMENT OF STEAM turbine of card 14 tests the speed, in the situation that recording the rotating speed of steam turbine, rotating speed card exports Steam Turbine Over-speed Accident signal for exceeding the speed limit, wherein, comparator 12 is connected with 14 while of the card Conjunction and disjunction logic functions device that tests the speed, in the situation that comparator 12 sends Steam Turbine Over-speed Accident signal with at least one output Steam Turbine Over-speed Accident signal or the logical device that test the speed in card 14 to relay 2.
Fig. 4 has shown the structural representation of the speed measurement device that the 3rd mode of execution of the present utility model provides, as shown in Figure 4, speed measurement device 1 comprises three velocity measurement plates 11, three comparators 12, three rotating speed cards 14, the first hypervelocity information module 13, the second hypervelocity information module 15 and or logical device 16.Wherein, three velocity measurement plates 11, three comparators 12 are identical with the hypervelocity information module 13 shown in Fig. 2 with the first hypervelocity information module 13() between connection and principle identical with Fig. 2, three rotating speed cards 14 are identical with the hypervelocity information module 15 shown in Fig. 3 with the second hypervelocity information module 15() between connection and principle identical with Fig. 3, in this, it will not go into details.
The first hypervelocity information module 13 is connected with the second hypervelocity information module 15 Conjunction and disjunction logic functions devices 16, the namely output of the first hypervelocity information module 13 and the second hypervelocity information module 15 as or the input of logical device 16, or the output of logical device 16 is connected with relay 2, by or the annexation of logical device 16 can find out, in the situation that at least one output Steam Turbine Over-speed Accident signal in the first hypervelocity information module 13 and the second hypervelocity information module 15, this or logical device 16 are sent Steam Turbine Over-speed Accident signal to relay 2.
Shown in hypervelocity information module 15 shown in hypervelocity information module 13 shown in above Fig. 2, Fig. 3 and Fig. 4 first hypervelocity information module 13 and the second hypervelocity information module 15 can be identical judgment device.
Fig. 5 has shown the schematic diagram of the hypervelocity information module that mode of execution of the present utility model provides, as shown in Figure 5, hypervelocity information module comprises three pairs of control switchs 17 that are connected in parallel, between every pair of control switch 17, be connected in series, three pairs of control switchs 17 can be connected in the following manner with rotating speed card 14: the control end of first pair of control switch 17 is connected with the first and second rotating speed cards 14 respectively, the control end of second pair of control switch 17 is connected with the 3rd rotating speed card 14 with second respectively, the control end of the 3rd pair of control switch 17 links and connects with the first and the 3rd rotating speed respectively, in the situation that rotating speed card 14 obtains the rotating speed of steam turbine, it is hypervelocity, the control switch 17 being connected with this rotating speed card 14 obtains electric, so that in the situation that the rotating speed that in three rotating speed cards 14, at least two rotating speed cards record steam turbine sends Steam Turbine Over-speed Accident signal to relay 2 for hypervelocity.
In this, describe a kind of mode of execution of the hypervelocity information module being connected with rotating speed card 14 in detail, this mode of execution also can be applied to the hypervelocity information module being connected with comparator 12.This mode of execution is only a kind of hard loop implementation method of hypervelocity information module, and those skilled in the art's can expect exceeding the speed limit realization of information module also can realize by soft logic.
Below describe by reference to the accompanying drawings preferred implementation of the present utility model in detail; but; the utility model is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
The turbine over equipment that the utility model provides not only can accurately and timely move protection equipment by the relay increasing; and the hypervelocity information module increasing realized proper three and get two protection logics, make the operation of equipment more reliable and more stable.
It should be noted that in addition each the concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible compound modes.
In addition, between various mode of execution of the present utility model, also can carry out combination in any, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (8)
1. a turbine over equipment, is characterized in that, this equipment comprises:
Speed measurement device, whether this speed measurement device is used for monitoring described steam turbine and exceeds the speed limit;
Relay, is connected with described speed measurement device, for the Steam Turbine Over-speed Accident signal sending according to described speed measurement device, sends control command; And
Solenoid valve, is connected with described steam turbine with described relay, for stop described steam turbine according to described control command, rotates.
2. turbine over equipment according to claim 1, is characterized in that, this equipment comprises two described relays that are connected in parallel and two described solenoid valves that are connected in parallel.
3. turbine over equipment according to claim 1, is characterized in that, described speed measurement device comprises:
Velocity measurement plate, for measuring the rotating speed of described steam turbine; And
Comparator, is connected with described velocity measurement plate, for rotating speed and the predefined rotary speed threshold value that described velocity measurement plate is recorded, compares, and exports Steam Turbine Over-speed Accident signal when measured rotating speed is greater than described rotary speed threshold value.
4. turbine over equipment according to claim 1, is characterized in that, described speed measurement device comprises:
Three velocity measurement plates, for measuring respectively the rotating speed of described steam turbine;
Three comparators, are connected with described three velocity measurement plates respectively, for measured rotating speed and the predefined rotary speed threshold value of described velocity measurement plate compared; And
Hypervelocity information module, the input end of described hypervelocity information module is connected with described three comparators respectively, the output terminal of described hypervelocity information module is connected with described relay, and the information module that exceeds the speed limit described in when the judgement of at least two comparators show that measured rotating speed is greater than described rotary speed threshold value in described three comparators sends described Steam Turbine Over-speed Accident signal to described relay.
5. turbine over equipment according to claim 1, is characterized in that, described speed measurement device also comprises:
Rotating speed card, for measuring the overspeed situation of described steam turbine, described rotating speed card is connected with described relay, and the rotating speed that records described steam turbine when described rotating speed card is exported Steam Turbine Over-speed Accident signal during for hypervelocity.
6. turbine over equipment according to claim 1, is characterized in that, described speed measurement device also comprises:
Three rotating speed cards, are respectively used to measure the overspeed situation of described steam turbine; And
Hypervelocity information module, the input end of described hypervelocity information module links and connects with described three rotating speeds respectively, the output terminal of described hypervelocity information module is connected with described relay, and the rotating speed that at least two rotating speed cards record described steam turbine in described three the rotating speed cards information module that exceeds the speed limit described in during for hypervelocity sends Steam Turbine Over-speed Accident signal to described relay.
7. turbine over equipment according to claim 1, is characterized in that, described speed measurement device comprises:
Three velocity measurement plates, for measuring respectively the rotating speed of described steam turbine;
Three comparators, are connected with described three velocity measurement plates respectively, for measured rotating speed and the predefined rotary speed threshold value of described velocity measurement plate compared;
The first hypervelocity information module, the input end of described the first hypervelocity information module is connected with described three comparators respectively, when in described three comparators, the judgement of at least two comparators show that measured rotating speed is greater than described rotary speed threshold value described in first information module that exceeds the speed limit export described Steam Turbine Over-speed Accident signal;
Three rotating speed cards, are respectively used to measure the overspeed situation of described steam turbine;
The second hypervelocity information module, the input end of described the second hypervelocity information module links and connects with described three rotating speeds respectively, the rotating speed that at least two rotating speed cards record described steam turbine in described three rotating speed cards during for hypervelocity described in the second hypervelocity information module output Steam Turbine Over-speed Accident signal; And
Or logical device, the output of described the first hypervelocity information module and described the second hypervelocity information module is as the input of described or logical device, and output described or logical device is connected to described relay.
8. according to the turbine over equipment described in claim 4,6 or 7, it is characterized in that, hypervelocity information module comprises:
Three pairs of control switchs that are connected in parallel, are connected in series between every pair of control switch, and described three pairs of control switchs are as follows with being connected of rotating speed card or comparator:
First pair of control switch control end is connected with the first rotating speed card or comparator, the second rotating speed card or comparator respectively;
The control end of second pair of control switch is connected with the second rotating speed card or comparator, the 3rd rotating speed card or comparator respectively;
The control end of the 3rd pair of control switch is connected with the first rotating speed card or comparator, the 3rd rotating speed card or comparator respectively;
Wherein, the rotating speed that obtains described steam turbine at described rotating speed card or comparator is during for hypervelocity, the control switch being connected with this rotating speed card or comparator obtains electric, so that the rotating speed that at least two rotating speed cards or comparator record described steam turbine in three rotating speed cards or comparator sends described Steam Turbine Over-speed Accident signal to described relay during for hypervelocity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320496513.7U CN203452857U (en) | 2013-08-14 | 2013-08-14 | Over-speed protection equipment for turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320496513.7U CN203452857U (en) | 2013-08-14 | 2013-08-14 | Over-speed protection equipment for turbine |
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| Publication Number | Publication Date |
|---|---|
| CN203452857U true CN203452857U (en) | 2014-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320496513.7U Expired - Lifetime CN203452857U (en) | 2013-08-14 | 2013-08-14 | Over-speed protection equipment for turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404066A (en) * | 2018-12-05 | 2019-03-01 | 华能国际电力股份有限公司大连电厂 | A kind of novel steam generating set monitoring and protection TSI system and its innovation optimization method |
-
2013
- 2013-08-14 CN CN201320496513.7U patent/CN203452857U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404066A (en) * | 2018-12-05 | 2019-03-01 | 华能国际电力股份有限公司大连电厂 | A kind of novel steam generating set monitoring and protection TSI system and its innovation optimization method |
| CN109404066B (en) * | 2018-12-05 | 2021-12-17 | 华能国际电力股份有限公司大连电厂 | Monitoring and protecting TSI (transient service interface) system of steam turbine generator unit and innovation optimization method thereof |
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| C14 | Grant of patent or utility model | ||
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Address after: 100011 Beijing Dongcheng District, West Binhe Road, No. 22 Patentee after: China Shenhua Energy Co.,Ltd. Patentee after: BEIJING GUOHUA POWER Co.,Ltd. Patentee after: Guoneng Yuedian Taishan Power Generation Co.,Ltd. Address before: 100011 Shenhua building, 22 West Binhe Road, Dongcheng District, Beijing Patentee before: China Shenhua Energy Co.,Ltd. Patentee before: BEIJING GUOHUA POWER Co.,Ltd. Patentee before: GUANGDONG GUOHUA YUEDIAN TAISHAN POWER GENERATION Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20140226 |
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