CN203756252U - Turbine regenerative system of ultra supercritical unit - Google Patents
Turbine regenerative system of ultra supercritical unit Download PDFInfo
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- CN203756252U CN203756252U CN201420128782.2U CN201420128782U CN203756252U CN 203756252 U CN203756252 U CN 203756252U CN 201420128782 U CN201420128782 U CN 201420128782U CN 203756252 U CN203756252 U CN 203756252U
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- 230000001172 regenerating effect Effects 0.000 title claims abstract description 23
- 238000000605 extraction Methods 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000002955 isolation Methods 0.000 claims description 17
- 239000000498 cooling water Substances 0.000 claims description 12
- 230000033228 biological regulation Effects 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 238000009413 insulation Methods 0.000 abstract 1
- 230000009466 transformation Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 6
- 235000019504 cigarettes Nutrition 0.000 description 5
- 239000003245 coal Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 240000004859 Gamochaeta purpurea Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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Abstract
The utility model discloses a turbine regenerative system of an ultra supercritical unit. According to the turbine regenerative system of the ultra supercritical unit, a steam inlet, a steam replenishing port and a high-pressure steam extracting port are formed in a high-pressure cylinder, the high-pressure steam extracting port is connected with a high-pressure heater through a high-pressure steam extracting pipeline, the steam replenishing port is connected with a high-pressure steam pipeline through a high-pressure steam replenishing valve, the steam replenishing port is further connected with a super-high-pressure steam extracting pipeline, the super-high-pressure steam extracting pipeline is connected with the high-pressure steam extracting pipeline in parallel and then connected to the high-pressure heater, check valves and insulation valves are arranged on the super-high-pressure steam extracting pipeline and the high-pressure steam extracting pipeline respectively, and a desuperheater is further arranged on the super-high-pressure steam extracting pipeline and connected with a desuperheating water pipeline. According to the turbine regenerative system of the ultra supercritical unit, it can be guaranteed that a denitration system can operate normally when the unit operates under an low-load condition, the feed-water temperature of a boiler is raised, and then the thermodynamic circulation efficiency is improved; higher-parameter steam extraction can be achieved through the steam replenishing port in the high-pressure cylinder, a steam extracting port does not need to be formed in the high-pressure cylinder, and cost for turbine transformation is greatly reduced.
Description
Technical field
The utility model relates to Steam Turbine Regenerative System, is specifically related to the steam turbine heat regenerative system that a kind of ultra supercritical unit utilizes extracted steam from turbine to heat boiler feed water.
Background technique
Steam Turbine Regenerative System is normally extracted a part of steam out from steam turbine, delivers in feed water preheater the heating for boiler feed water, thereby improves the mean temperature of working medium endothermic process in boiler, to improve the efficiency of thermal cycle of unit.
Meanwhile, the fume emission of fossil-fired unit will meet environmental requirement, national regulation fossil-fired unit more than 50% rated load, must put into operation denitration and NO
xeffluent concentration is less than 100 milligrams/cubic metre.
Current Power Plant, because need to participate in peak regulation, is usually moved under the state lower than rated load, and some unit even, through 40%～70% rated load section operation of being everlasting, greatly reduces unit efficiency of thermal cycle, and net coal consumption rate significantly rises.What is more important, when unit moves under low-load, (the denitrating catalyst kind selected by power plant of this temperature determines the minimum cigarette temperature that the import cigarette temperature of SCR denitrating system reactor can require lower than denitrating catalyst, the minimum flue-gas temperature that different denitrating catalysts require is slightly different, generally at 300～320 ℃) time, cause the SCR denitrating system that cannot put into operation, can not reach the requirement of country to fossil-fired unit fume emission.Some fossil-fired unit is at the 60% rated load denitrating system of just having to exit of operation below 70% rated load even, and the NO that boiler burning produces during performing low-load running of machine set
xthe NO that concentration produces during on the contrary much larger than rated load
x(the boiler at low load operation having produces NO to concentration
xconcentration is more than 2 times of rated load generation).
Owing to there being above-mentioned contradiction, those skilled in the art is devoted to develop a kind of better adaptability, the more reliable water supply heat back system of operation, can reach in all cases the parameter request of SCR denitrating system, and reduce NO
xin the time of discharge, can also improve the thermodynamic system cycle efficiency of performing low-load running of machine set, reduce net coal consumption rate.
For example, prior art once proposed a kind of scheme, it is after original high-pressure heater, set up again a final stage feed water preheater, on high-pressure cylinder, set up a final stage extraction opening that the parameter of drawing gas is higher simultaneously, original high-pressure heater is connected with original conventional extraction opening on steam turbine high-pressure cylinder by extraction line, and final stage feed water preheater is connected with the final stage extraction opening of setting up by final stage extraction line, in order to further heating boiler feedwater.Due to the extraction pressure of the final stage extraction opening extraction pressure far above the conventional extraction opening of high-pressure cylinder, therefore on final stage extraction line, be provided with extraction control valve, for drawing gas of final stage extraction line carried out to throttling adjusting, to keep the pressure after described extraction control valve substantially constant, correspondingly make described final stage feed water preheater when steam turbine varying duty, still can maintain the temperature of boiler feed water substantially constant, in order to improve the thermal efficiency of unit in peak regulation process.But its defect is:
1. this technology need contact again outside conventional water supply system one " final stage feed water preheater ", make unit under each operating conditions, water supply system resistance increases, cause energy dissipation, even if unit does not need this " final stage feed water preheater " to put into operation when declared working condition, boiler feed water also must be passed through this heater, thereby inevitably causes the reduction of unit efficiency.
2. owing to having set up one " final stage feed water preheater ", investment cost is increased considerably; And some power station design itself time makes full use of space, field apparatus characteristics of compact layout, does not possess all conditions of larger final stage feed water preheater of a weight and size is installed again, causes the narrow limitation of this technology application.
Model utility content
The technical problems to be solved in the utility model is to provide a kind of Steam Turbine Regenerative System that is applicable to ultra supercritical unit, have the advantages that reforming cost is low, adaptability is good, make ultra supercritical unit when underrun, also can meet the parameter request of the SCR denitrating system that puts into operation, reducing NO
xdischarge time, can also improve the thermodynamic system cycle efficiency of performing low-load running of machine set, reduce net coal consumption rate, reach the object of not only energy-conservation but also environmental protection.
In order to solve the problems of the technologies described above, the utility model adopts following technological scheme: a kind of ultra supercritical power generator turbine heat regenerative system, comprise high-pressure cylinder and high-pressure heater, high-pressure cylinder is provided with steam inlet, steam-expelling port and high pressure extraction mouth, described high pressure extraction mouth is connected with high-pressure heater by high pressure extraction pipeline, on described high-pressure cylinder, be also provided with filling mouth, described filling mouth is connected with high pressure steam pipeline by high pressure filling valve, described filling mouth also connects a ultrahigh pressure bleed steam pipework, the steam ouput of the steam ouput of described ultrahigh pressure bleed steam pipework and described high pressure extraction pipeline is connected on the steam inlet of described high-pressure heater simultaneously, on described ultrahigh pressure bleed steam pipework and high pressure extraction pipeline, be all provided with non-return flap and isolation door, on described ultrahigh pressure bleed steam pipework, be also provided with a desuperheater, described desuperheater is connected with cooling water pipeline.
Preferably, there are two symmetrically arranged filling mouths to connect described ultrahigh pressure bleed steam pipework simultaneously.
Preferably, on described ultrahigh pressure bleed steam pipework, in the upstream of desuperheater, be also provided with a pressure regulation door.
Preferably, on described cooling water pipeline, in the upstream of desuperheater, be also provided with a Flow-rate adjustment door.
Further, on described cooling water pipeline, in the upstream of Flow-rate adjustment door, be also provided with non-return flap and isolation door.
Preferably, in the boiler flue of described unit, be provided with boiler economizer, the water outlet of described high-pressure heater is connected with the water intake of boiler economizer.
Compared with prior art, the utlity model has following significant beneficial effect:
1. the utility model utilizes existing gas supplementing opening on ultra supercritical unit high-pressure cylinder, and only need set up simply bleed steam pipework just can realize more drawing gas of high parameter, without again offer extraction opening on high-pressure cylinder, greatly reduces the cost of steam turbine reformation.
2. heat regenerative system of the present utility model is simple in structure, also, without setting up in addition high-pressure heater, can reduce cost of investment, saves installing space; Only need to switch isolation door at certain operating point, complete the switching of ultrahigh pressure bleed steam pipework and high pressure extraction pipeline, security of operation, reliable.
3. adopt the technical solution of the utility model, can when underrun, increase regenerative steam enthalpy, heating boiler feedwater, improves boiler feed temperature, thereby improves unit thermodynamic system efficiency.
4. the utility model improves the economizer exit cigarette temperature of unit under low-load, the temperature variation of the import cigarette temperature that makes air preheater under unit different load reduces, thereby rotary regenerative air preheater amount of deformation reduces, during performing low-load running of machine set, air leak rate of air preheater reduces, improve its heat exchange efficiency, reduced boiler fan power consumption and boiler exhaust gas thermal loss.
5. the utility model can improve the boiler feed temperature under unit low-load, improves boiler water wall hydrodynamic characterisitic, thereby improves the Security of boiler in underrun.
6. the utility model adaptability is good, reliable, when ultra supercritical unit is moved under low-load, also can meet the parameter request of the SCR denitrating system that puts into operation, and is reducing NO
xdischarge time, reduce unit net coal consumption rate, reach the object of not only energy-conservation but also environmental protection.
Accompanying drawing explanation
Fig. 1 is the utility model ultra supercritical power generator turbine heat regenerative system the first embodiment's structural representation.
Fig. 2 is the utility model ultra supercritical power generator turbine heat regenerative system the second embodiment's structural representation.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, those skilled in the art can more clearly understand other advantages of the present utility model and effect thus.
It should be noted that the structure that Figure of description illustrates, ratio, size etc. only in order to coordinate embodiment, more clearly understand design of the present utility model for those skilled in the art, not in order to limit protection domain of the present utility model.The adjustment of the change of any structural modification (such as increasing some protection facilities: ultrahigh pressure bleed steam pipework arranges safety door, draining valve etc.), proportionate relationship or size; in the situation that not affecting effect of the present utility model and object and reaching, within all should still dropping on protection domain of the present utility model.
The utility model the first embodiment as shown in Figure 1, a kind of Steam Turbine Regenerative System for 1000MW grade or 660MW grade ultra supercritical unit, comprise high-pressure cylinder 1 and high-pressure heater 6, high-pressure cylinder 1 is provided with steam inlet 11, steam-expelling port (not shown) and high pressure extraction mouth 12, wherein high pressure extraction mouth 12 is connected with high-pressure heater 6 by high pressure extraction pipeline 2, and high pressure extraction pipeline 2 is provided with non-return flap 21 and isolation door 22.
For 1000MW grade or 660MW grade ultra supercritical unit; on high-pressure cylinder 1, be conventionally also provided with filling mouth 13; filling mouth 13 is connected with high pressure steam pipeline 5 by high pressure filling valve 51; when unit is when moving down at full capacity and needing super generating or while improving frequency modulation control characteristic; can open high pressure filling valve 51, make boiler main steam fill into high-pressure cylinder 1 by high-pressure cylinder main inlet throttle-stop valve to high pressure steam line 5.
In order to solve unit boiler feed temperature when the underrun, reduce and cause too low SCR denitration and the problem such as thermodynamic system efficiency is low of can not putting into operation of boiler economizer exit gas temperature, the utility model proposes a solution, the ultrahigh pressure that utilizes filling mouth 13 to realize under low-load draws gas for heating boiler feedwater, improves feed temperature, and without again offer special ultrahigh pressure extraction opening on high-pressure cylinder, thereby greatly reduce reforming cost.
As shown in Figure 1, filling mouth 13 connects a ultrahigh pressure bleed steam pipework 3, is also provided with non-return flap 31 and isolation door 32 on ultrahigh pressure bleed steam pipework 3.The steam ouput of the steam ouput of ultrahigh pressure bleed steam pipework 3 and described high pressure extraction pipeline 2 is connected on the steam inlet of high-pressure heater 6 after merging simultaneously, high-pressure cylinder can be done to the steam of merit and extract input high-pressure heater 6 out.But because the parameter of drawing gas of filling mouth 13 is higher, pressure and temperature does not mate with the running parameter of high-pressure heater 6, therefore the utility model is also provided with pressure regulation door 33 and desuperheater 44 on described ultrahigh pressure bleed steam pipework 3, pressure regulation door 33 is in the upstream of desuperheater 44, for reducing the vapor pressure of ultrahigh pressure bleed steam pipework 3; Desuperheater 44 is connected with cooling water pipeline 4, for spray boiler hot cooling water again to ultrahigh pressure bleed steam pipework 3, to reduce the temperature of steam.Preferably, on cooling water pipeline 4, in the upstream of desuperheater 44, be also provided with a Flow-rate adjustment door 43, for regulating the flow of cooling water.In the upstream of Flow-rate adjustment door 43, be also provided with non-return flap 41 and isolation door 42.On ultrahigh pressure bleed steam pipework 3, in the downstream of desuperheater 44, an isolation door 34 can also be set.
For fear of unbalanced drawing gas, the normal operation of high-pressure cylinder 1 is impacted, the present embodiment adopts two symmetrically arranged filling mouths 13 to connect described ultrahigh pressure bleed steam pipework 3 simultaneously.
The utility model the second embodiment as shown in Figure 2, different from the first embodiment is, the present embodiment is the mode of two high-pressure heater 6 parallel connections, on the steam inlet of two high-pressure heaters 6, be all connected with non-return flap 61 and isolation door 62, after the steam ouput of the steam ouput of ultrahigh pressure bleed steam pipework 3 and described high pressure extraction pipeline 2 merges, be further divided into two-way, be connected with the steam inlet (non-return flap 61 and isolation door 62 are installed) of two high-pressure heaters 6 respectively.
The common practise that act as related domain of above-mentioned each non-return flap, for stoping the reverse flow of the medium such as steam, water of each pipeline.
High-pressure heater 6 described in the utility model is the afterbody heaters that utilize extracted steam from turbine heating, that is to say, the water outlet of high-pressure heater 6 will be connected with the water intake of boiler economizer, boiler economizer is positioned at boiler flue, and denitrating system reactor is positioned at the flue in boiler economizer downstream, therefore, boiler feed temperature after high-pressure heater 6 heating can affect the outlet cigarette temperature of boiler economizer, namely can affect the inlet flue gas temperature of denitrating system reactor, this is the common practise of related domain, repeats no more.
The following describes the operation method of the utility model ultra supercritical power generator turbine heat regenerative system.
When ultra supercritical unit operation is between high load region, open non-return flap 21 and isolation door 22 on high pressure extraction pipeline 2, isolation door 42, Flow-rate adjustment door 43 on non-return flap 31 on ultrahigh pressure bleed steam pipework 3, isolation door 32,34, pressure regulation door 33 and cooling water pipeline 4 all keep closed condition, make high pressure extraction mouth 12 for high-pressure heater 6 steam supplies, boiler feed water is delivered to boiler economizer after being heated in high-pressure heater 6.
When ultra supercritical unit is during at low-load section operation, due to the extraction pressure meeting random group load reduction of high pressure extraction mouth 12, obviously decline, rely on the steam of high pressure extraction pipeline 2 the boiler feed water in high-pressure heater 6 cannot be heated to suitable temperature, under this operating mode, close non-return flap 21 and isolation door 22 on high pressure extraction pipeline 2, open the non-return flap 31 on ultrahigh pressure bleed steam pipework 3, isolation door 32, 34 and cooling water pipeline 4 on isolation door 42, Flow-rate adjustment door 43, from filling mouth 13, extract the more steam of high pressure and temperature, after 33 decompressions of pressure regulation door and desuperheater 44 desuperheats, enter in high-pressure heater 6.By regulating pressure regulation door 33 and Flow-rate adjustment door 43, control vapor pressure and temperature, the parameter that makes to draw gas all meets the requirement of high-pressure heater 6 safe operations under each operating mode, guarantee that the boiler feed water in high-pressure heater 6 also can be heated and bring up to suitable temperature under running on the lower load, make ultra supercritical unit when low-load section operation, economizer exit flue-gas temperature meets when putting into operation the requirement of SCR denitrating system, has improved unit efficiency of thermal cycle, has reduced unit net coal consumption rate.
Claims (6)
1. a ultra supercritical power generator turbine heat regenerative system, comprise high-pressure cylinder (1) and high-pressure heater (6), high-pressure cylinder (1) is provided with steam inlet (11) and high pressure extraction mouth (12), described high pressure extraction mouth (12) is connected with high-pressure heater (6) by high pressure extraction pipeline (2), it is characterized in that, on described high-pressure cylinder (1), be also provided with filling mouth (13), described filling mouth (13) is connected with high pressure steam pipeline (5) by high pressure filling valve (51), described filling mouth (13) also connects a ultrahigh pressure bleed steam pipework (3), the steam ouput of the steam ouput of described ultrahigh pressure bleed steam pipework (3) and described high pressure extraction pipeline (2) is connected on the steam inlet of described high-pressure heater (6) simultaneously, on described ultrahigh pressure bleed steam pipework (3) and high pressure extraction pipeline (2), be all provided with non-return flap and isolation door, on described ultrahigh pressure bleed steam pipework (3), be also provided with a desuperheater (44), described desuperheater (44) is connected with cooling water pipeline (4).
2. ultra supercritical power generator turbine heat regenerative system according to claim 1, is characterized in that, has two symmetrically arranged filling mouths (13) to connect described ultrahigh pressure bleed steam pipework (3) simultaneously.
3. ultra supercritical power generator turbine heat regenerative system according to claim 1, is characterized in that, upper at described ultrahigh pressure bleed steam pipework (3), in the upstream of desuperheater (44), is also provided with a pressure regulation door (33).
4. ultra supercritical power generator turbine heat regenerative system according to claim 1, is characterized in that, upper at described cooling water pipeline (4), in the upstream of desuperheater (44), is also provided with a Flow-rate adjustment door (43).
5. ultra supercritical power generator turbine heat regenerative system according to claim 4, is characterized in that, upper at described cooling water pipeline (4), in the upstream of Flow-rate adjustment door (43), is also provided with non-return flap and isolation door.
6. ultra supercritical power generator turbine heat regenerative system according to claim 1, is characterized in that, in the boiler flue of described unit, is provided with boiler economizer, and the water outlet of described high-pressure heater (6) is connected with the water intake of boiler economizer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420128782.2U CN203756252U (en) | 2014-03-20 | 2014-03-20 | Turbine regenerative system of ultra supercritical unit |
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| CN201420128782.2U CN203756252U (en) | 2014-03-20 | 2014-03-20 | Turbine regenerative system of ultra supercritical unit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105435597A (en) * | 2015-12-23 | 2016-03-30 | 广东惠州平海发电厂有限公司 | System for improving denitration operation rate of Siemens 1000MW/600MW ultra-supercritical unit |
| CN105953213A (en) * | 2016-05-16 | 2016-09-21 | 长沙湘资生物科技有限公司 | Hot-pressing type ultra supercritical unit number-zero high-pressure heater and switching system thereof |
| CN106050337A (en) * | 2016-07-29 | 2016-10-26 | 南京电力设备质量性能检验中心 | Method and device for increasing water feed temperature at medium loads and low loads of steam turbine set |
| CN106076117A (en) * | 2016-07-11 | 2016-11-09 | 浙江浙能技术研究院有限公司 | A kind of fired power generating unit efficient low-load denitrification apparatus and control method |
| CN110319431A (en) * | 2019-02-18 | 2019-10-11 | 联合瑞升（北京）科技有限公司 | Economizer lower water temperature system under a kind of full load denitration operating condition |
| CN112282872A (en) * | 2020-11-18 | 2021-01-29 | 哈尔滨汽轮机厂有限责任公司 | Adjustable heat recovery system of ultra supercritical steam turbine |
| CN112805454A (en) * | 2018-09-27 | 2021-05-14 | 西门子能源环球有限责任两合公司 | Fluid mechanical device and method for operating a fluid mechanical device |
-
2014
- 2014-03-20 CN CN201420128782.2U patent/CN203756252U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105435597A (en) * | 2015-12-23 | 2016-03-30 | 广东惠州平海发电厂有限公司 | System for improving denitration operation rate of Siemens 1000MW/600MW ultra-supercritical unit |
| CN105953213A (en) * | 2016-05-16 | 2016-09-21 | 长沙湘资生物科技有限公司 | Hot-pressing type ultra supercritical unit number-zero high-pressure heater and switching system thereof |
| CN105953213B (en) * | 2016-05-16 | 2017-08-29 | 张曙光 | A kind of heat pressing type extra-supercritical unit is No. zero high to be added and its switching system |
| CN106076117A (en) * | 2016-07-11 | 2016-11-09 | 浙江浙能技术研究院有限公司 | A kind of fired power generating unit efficient low-load denitrification apparatus and control method |
| CN106076117B (en) * | 2016-07-11 | 2018-09-25 | 浙江浙能技术研究院有限公司 | A kind of fired power generating unit efficient low-load denitrification apparatus and control method |
| CN106050337A (en) * | 2016-07-29 | 2016-10-26 | 南京电力设备质量性能检验中心 | Method and device for increasing water feed temperature at medium loads and low loads of steam turbine set |
| CN112805454A (en) * | 2018-09-27 | 2021-05-14 | 西门子能源环球有限责任两合公司 | Fluid mechanical device and method for operating a fluid mechanical device |
| CN110319431A (en) * | 2019-02-18 | 2019-10-11 | 联合瑞升（北京）科技有限公司 | Economizer lower water temperature system under a kind of full load denitration operating condition |
| CN112282872A (en) * | 2020-11-18 | 2021-01-29 | 哈尔滨汽轮机厂有限责任公司 | Adjustable heat recovery system of ultra supercritical steam turbine |
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