CN110319431A - Economizer lower water temperature system under a kind of full load denitration operating condition - Google Patents
Economizer lower water temperature system under a kind of full load denitration operating condition Download PDFInfo
- Publication number
- CN110319431A CN110319431A CN201910431558.8A CN201910431558A CN110319431A CN 110319431 A CN110319431 A CN 110319431A CN 201910431558 A CN201910431558 A CN 201910431558A CN 110319431 A CN110319431 A CN 110319431A
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- Prior art keywords
- steam
- steam turbine
- pressure
- economizer
- operating condition
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000000605 extraction Methods 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000000779 smoke Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 230000000740 bleeding effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
Economizer lower water temperature system under a kind of full load denitration operating condition, including steam turbine high-pressure cylinder, No. 1 high-pressure heater, economizer, boiler, increase steam turbine；1 section of bleed steam pipework of steam turbine high-pressure cylinder accesses No. 1 high-pressure heater vapour side；The high-temperature steam pipeline for increasing steam turbine higher pressure steam inlet connection boiler increases steam turbine low-pressure steam inlet and connects 1 section of bleed steam pipework of steam turbine high-pressure cylinder, increases the outlet of steam turbine mixed vapour and is connected to No. 1 high-pressure heater vapour side；Boiler feedwater is by No. 1 high-pressure heater, by entering economizer after steam heat temperature raising；Retrofit work amount is small, and expense cost is low；Under unit high load capacity or underload, SCR denitration device is effectively run.
Description
Technical field
The invention belongs to environment protection fields, and in particular to economizer lower water temperature system under a kind of full load denitration operating condition.
Background technique
In recent years, it is serious problems that thermal power plant faces that fired power generating unit annual in China's was low using hourage, most of
The rate of load condensate of unit is less than 70%, even lower.Under underload operating condition, economizer inlet water temperature can be relatively low, into
The water supply heat absorption for entering economizer is excessive, too low so as to cause economizer exit smoke temperature.
SCR denitration device is arranged in after economizer, and catalyst can fail in the case where being lower than 290 DEG C of working environments, so working as
Since economizer exit smoke temperature is too low when performing low-load running of machine set, it will lead to SCR denitration device and be unable to operate normally.
When performing low-load running of machine set, such as to realize that SCR denitration device operates normally, it is necessary to improve and enter SCR denitration device
Flue-gas temperature, most effective one method is exactly to improve economizer exit flue-gas temperature.It is at present raising economizer exit cigarette
Temperature, thermal power plant would generally be solved using three kinds of modes.
One is to add gas bypass, and economizer exit smoke temperature can be improved in this mode, but overall thermal efficiency can be made to reduce.
Secondly being cutting economizer, this mode can guarantee to improve economizer exit smoke temperature while boiler thermal efficiency, but
Larger to boiler change, the change period is long, and expense cost is high.
Thirdly to add No. 0 high-pressure heater equipment, it is therefore an objective to improve the inlet water temperature for entering economizer, reduce water supply and exist
Caloric receptivity in economizer just improves economizer exit smoke temperature so that outlet smoke temperature reduces less naturally.But this mode needs
To increase a new high-pressure heater in heat regenerative system, heat regenerative system pipeline is transformed and added No. 0 hyperbaric heating
Arrangement construction of the device in power plant steam turbine room is usually relatively difficult.
Three of the above mode has disadvantage, implements all relatively difficult, is changed in particular for existing operating unit
It makes in engineering.
Summary of the invention
The purpose of the present invention is to provide under a kind of out of stock operating condition of full load, based on the economizer inlet water temperature tune for increasing steam turbine
Section system.
Economizer lower water temperature system under a kind of full load denitration operating condition, including steam turbine high-pressure cylinder, No. 1 hyperbaric heating
Device, boiler, increases steam turbine at economizer；The high-temperature steam pipeline of boiler is connected to steam turbine high-pressure cylinder；1 section of steam turbine high-pressure cylinder pumping
Vapor pipeline accesses No. 1 high-pressure heater vapour side；It is characterized in that, increasing the high temperature steam pipe of steam turbine higher pressure steam inlet connection boiler
Road increases steam turbine low-pressure steam inlet and connects 1 section of bleed steam pipework of steam turbine high-pressure cylinder, increases the outlet of steam turbine mixed vapour and is connected to No. 1
High-pressure heater vapour side；Boiler feedwater is by No. 1 high-pressure heater, by entering economizer after steam heat temperature raising.
The present invention has the advantages that
1, without changing boiler, boiler overall thermal efficiency is not reduced.Do not increase high-pressure heater additionally, only increases and increase
Steam turbine equipment.Retrofit work amount is small, and improvement project facilitates implementation, and the change period is short, and expense cost is low.
2, economizer inlet water temperature when can significantly improve underload by adding steam turbine, effectively improves economizer exit
Smoke temperature, and guarantee that the decline of economizer exit smoke temperature is smaller under running on the lower load, so that the flue-gas temperature into SCR device is higher than
290℃.No matter unit high load capacity or underload, SCR denitration device can effectively run.
Detailed description of the invention
Fig. 1 is economizer lower water temperature system schematic under a kind of full load denitration operating condition.
Wherein: steam turbine high-pressure cylinder (1), No. 2 high-pressure heaters (2), No. 1 high-pressure heater (3), economizer (4), boiler
(5), increase steam turbine (6), No. 1 high-pressure heater water side outlet motor-driven valve (7), increase steam turbine exhaust steam valve (8), high pressure cylinder extraction valve (9),
Increase steam turbine low-pressure side inlet valve (10), increase steam turbine high-pressure side inlet valve (11).
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings, it should be understood that content described herein is merely to illustrate
It is of the invention with explaining, it is not intended to limit the present invention.
Economizer lower water temperature system under a kind of full load denitration operating condition, including (1) steam turbine high-pressure cylinder, (2) No. 2
High-pressure heater, (3) No. 1 high-pressure heaters, (4) economizer, (5) boiler, (6) increase steam turbine.
The high-temperature steam pipeline of boiler is connected to steam turbine high-pressure cylinder, and steam turbine high-pressure cylinder exhaust line is connected to reheating
Device conveys steam to intermediate pressure cylinder after reheater；
Steam turbine high-pressure cylinder exhaust line accesses No. 2 high-pressure heater vapour sides, 1 section of bleed steam pipework access of steam turbine high-pressure cylinder
No. 1 high-pressure heater vapour side.
Boiler feedwater passes sequentially through No. 2 high-pressure heaters, No. 1 high-pressure heater, saves coal by entering after steam heat temperature raising
Device.
Setting increases steam turbine system, increases steam turbine higher pressure steam inlet and connects the high-temperature steam pipeline from boiler, it is low to increase steam turbine
It presses steam inlet to connect 1 section of bleed steam pipework of steam turbine high-pressure cylinder, increases the outlet of steam turbine mixed vapour and be connected to No. 1 high-pressure heater vapour
Side.
By increasing steam turbine, after the mixing heating of high steam draws low pressure steam, it is sent to No. 1 high-pressure heater, thus
The adjustable leaving water temperature for improving No. 1 high-pressure heater, improves the inlet water temperature for entering economizer.
Corresponding control valve is set on each pipeline, is increased including (7) No. 1 high-pressure heater water side outlet motor-driven valves, (8)
Steam turbine exhaust steam valve, (9) high pressure cylinder extraction valve, (10) increase steam turbine low-pressure side inlet valve, (11) increase steam turbine high-pressure side inlet valve.
Setting increases steam turbine high-pressure side inlet valve on increasing steam turbine high-pressure steam pipe, increases setting on steam turbine low pressure steam pipe and increases vapour
Machine low-pressure side inlet valve increases setting on turbine exhaust steam duct and increases steam turbine exhaust steam valve；It is arranged on 1 section of bleed steam pipework of steam turbine high-pressure cylinder high
Cylinder pressure extraction valve.No. 1 high-pressure heater water side outlet motor-driven valve is set on No. 1 high-pressure heater water side outlet pipeline.
Increase steam turbine exhaust steam valve by (8), (10) increase steam turbine low-pressure side inlet valve, (11) increase steam turbine high-pressure side inlet valve and close
It closes, excision increases steam turbine and do not put into operation, and (9) high pressure cylinder extraction valve is opened simultaneously, and No. 1 high adding system is put into operation.
It is closed by (9) high pressure cylinder extraction valve, No. 1 high adding system of excision does not put into operation；(8) increase steam turbine steam discharge simultaneously
Valve, (10) increase steam turbine low-pressure side inlet valve, (11) increase steam turbine high-pressure side inlet valve and open, and will increase steam turbine system and put into operation.
Utilize No. 1 electronic valve regulation feedwater flow of high-pressure heater water side outlet.
Embodiment:
Certain power plant is the subcritical Direct Air-cooled Unit of 2 × 300MW.Boiler smoke system is equipped with SCR denitration device.Unit
Minimum load 30%.When unit operating load is more than or equal to 70% operation, SCR input gas temperature is greater than 290 DEG C, SCR dress
Setting can operate normally.When unit operating load is less than 70% operation, SCR input gas temperature is less than 290 DEG C, SCR device
It is unable to operate normally.
It is in parallel on 1 section of steam pumping pipeline of high pressure cylinder to increase steam turbine system.No. 1 steam bleeding system and increasing steam turbine system, share same
One high-pressure heater.Two systems can switch under high load capacity and underload.When unit high load capacity, according to original No. 1
Steam bleeding system operation increases steam turbine system and does not put into operation；When unit underload, increase the operation of steam turbine system, No. 1 steam bleeding system is not transported
Row.
When unit high load capacity situation: (8) increase steam turbine exhaust steam valve, (10) increase steam turbine low-pressure side inlet valve, (11) increase steam turbine height
It presses side inlet valve to close, increases steam turbine and do not run, (9) high pressure cylinder extraction valve is opened, No. 1 high adding system operation.
When unit underload situation: (9) high pressure cylinder extraction valve is closed, and No. 1 high adding system is not run；(8) increase steam turbine steam discharge
Valve, (10) increase steam turbine low-pressure side inlet valve, (11) increase steam turbine high-pressure side inlet valve and open, and increase steam turbine and put into operation.
For match parameter steam, increases steam turbine high steam, setting spray Desuperheating device on low-pressure steam pipeline, access is steamed
Vapour carries out parameter adjustment processing.In addition, flow control valve is additionally provided on increasing steam turbine high steam, low-pressure steam pipeline, to adjust
Steam flow is adjusted to steam turbine operating condition is increased.The pattern for increasing steam turbine uses fixed nozzle formula or adjustable nozzle formula, fixed nozzle
The working characteristics that formula increases steam turbine is constant, and the working characteristics that adjustable nozzle formula increases steam turbine can accordingly be changed by adjusting nozzle location
Become.
No. 1 extraction temperature when underload can be lower than No. 1 extraction temperature of high load capacity operating condition, if according to original No. 1
High adding system operation, since heating vapor (steam) temperature is low, height plus leaving water temperature can be reduced, and economizer inlet water temperature also decreases；
And the steam discharge after increasing steam turbine heating, temperature are basic with vapor (steam) temperature when high load capacity operating condition into No. 1 high-pressure heater
Quite, so, high load capacity operating condition and running on the lower load can share same No. 1 high-pressure heater.After increasing steam turbine heating
Steam discharge, add into No. 1 height, due to heating vapor (steam) temperature increase, height plus leaving water temperature can improve, economizer inlet water temperature
It increases accordingly, the decline of economizer exit smoke temperature is smaller, so that the flue-gas temperature into SCR device is higher than 290 DEG C.In this way, nothing
By high load capacity or underload, SCR denitration device can effectively be run.
Finally, it should be noted that being not intended to restrict the invention the foregoing is merely explanation of the invention, although to this hair
It is bright to be described in detail, it for those skilled in the art, still can be to aforementioned documented technical solution
It modifies or equivalent replacement of some of the technical features.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (10)
1. economizer lower water temperature system under a kind of full load denitration operating condition, including steam turbine high-pressure cylinder, No. 1 high-pressure heater,
Economizer, increases steam turbine at boiler；The high-temperature steam pipeline of boiler is connected to steam turbine high-pressure cylinder；1 section of extraction steam pipe of steam turbine high-pressure cylinder
No. 1 high-pressure heater vapour side is accessed on road；It is characterized in that, increase the high-temperature steam pipeline of steam turbine higher pressure steam inlet connection boiler,
Increase steam turbine low-pressure steam inlet and connect 1 section of bleed steam pipework of steam turbine high-pressure cylinder, increases the outlet of steam turbine mixed vapour and be connected to No. 1 high pressure
Heater vapour side；Boiler feedwater is by No. 1 high-pressure heater, by entering economizer after steam heat temperature raising.
2. economizer lower water temperature system under a kind of full load denitration operating condition according to claim 1, which is characterized in that vapour
Turbine high pressure cylinder exhaust line accesses No. 2 high-pressure heater vapour sides；Boiler feedwater passes sequentially through No. 2 high-pressure heaters, No. 1 high pressure
Heater, by entering economizer after steam heat temperature raising.
3. economizer lower water temperature system under a kind of full load denitration operating condition according to claim 1, which is characterized in that vapour
Turbine high pressure cylinder exhaust line is additionally coupled to reheater, and steam is conveyed after reheater to intermediate pressure cylinder.
4. economizer lower water temperature system under a kind of full load denitration operating condition according to claim 1, which is characterized in that increase
Setting increases steam turbine high-pressure side inlet valve on steam turbine high-pressure steam pipe, increases setting on steam turbine low pressure steam pipe and increases steam turbine low-pressure side into vapour
Valve increases setting on turbine exhaust steam duct and increases steam turbine exhaust steam valve；High pressure cylinder extraction valve is set on 1 section of bleed steam pipework of steam turbine high-pressure cylinder.
5. economizer lower water temperature system under a kind of full load denitration operating condition according to claim 4, which is characterized in that machine
When group high load capacity, increases steam turbine exhaust steam valve, increase steam turbine low-pressure side inlet valve, increase the closing of steam turbine high-pressure side inlet valve, excision increases steam turbine
It does not put into operation, high pressure cylinder extraction valve is opened, and enters No. 1 high-pressure heater using 1 section of steam extraction to put into operation.
6. economizer lower water temperature system under a kind of full load denitration operating condition according to claim 4, which is characterized in that machine
When group underload, high pressure cylinder extraction valve is closed, and is increased steam turbine exhaust steam valve, is increased steam turbine low-pressure side inlet valve, increases steam turbine high-pressure side into vapour
Valve is opened, and is increased steam turbine and is put into operation, is put into operation using steam turbine steam discharge is increased into No. 1 high-pressure heater.
7. economizer lower water temperature system under a kind of full load denitration operating condition according to claim 1, which is characterized in that 1
No. 1 high-pressure heater water side outlet motor-driven valve is set on number high-pressure heater water side outlet pipeline.
8. economizer lower water temperature system under a kind of full load denitration operating condition according to claim 1, which is characterized in that increase
Setting spray Desuperheating device on steam turbine high steam, low-pressure steam pipeline carries out parameter adjustment processing to access steam.
9. economizer lower water temperature system under a kind of full load denitration operating condition according to claim 1, which is characterized in that increase
It is additionally provided with regulating valve on steam turbine high steam, low-pressure steam pipeline, to adjust steam flow.
10. economizer lower water temperature system under a kind of full load denitration operating condition according to claim 1, which is characterized in that
The pattern for increasing steam turbine uses fixed nozzle formula or adjustable nozzle formula.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910118704 | 2019-02-18 | ||
| CN2019101187041 | 2019-02-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110319431A true CN110319431A (en) | 2019-10-11 |
Family
ID=68113363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910431558.8A Pending CN110319431A (en) | 2019-02-18 | 2019-05-22 | Economizer lower water temperature system under a kind of full load denitration operating condition |
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| Country | Link |
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| CN (1) | CN110319431A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754343A (en) * | 2022-04-11 | 2022-07-15 | 峰和轻碳(北京)设计研究院有限公司 | Wide-load denitration system and adjusting method considering stable combustion performance of boiler |
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| CN203756252U (en) * | 2014-03-20 | 2014-08-06 | 王振宇 | Turbine regenerative system of ultra supercritical unit |
| CN104976609A (en) * | 2015-06-17 | 2015-10-14 | 大唐(北京)能源管理有限公司 | Water feeding heating system capable of improving denitration effect |
| CN205876408U (en) * | 2016-07-29 | 2017-01-11 | 南京电力设备质量性能检验中心 | Low -load feed water temperature's device among improvement turbine unit |
| CN207006111U (en) * | 2017-07-28 | 2018-02-13 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of device for improving thermal power plant denitrating flue gas reaction temperature |
| CN107830510A (en) * | 2017-11-17 | 2018-03-23 | 程晋瑞 | A kind of wide load of new vapour source of fired power generating unit high-pressure heater carries effect and out of stock technological system and matching process |
| CN108613164A (en) * | 2018-04-08 | 2018-10-02 | 大唐(北京)能源管理有限公司 | The feed heating system of denitration effect under a kind of improvement underload |
-
2019
- 2019-05-22 CN CN201910431558.8A patent/CN110319431A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203756252U (en) * | 2014-03-20 | 2014-08-06 | 王振宇 | Turbine regenerative system of ultra supercritical unit |
| CN104976609A (en) * | 2015-06-17 | 2015-10-14 | 大唐(北京)能源管理有限公司 | Water feeding heating system capable of improving denitration effect |
| CN205876408U (en) * | 2016-07-29 | 2017-01-11 | 南京电力设备质量性能检验中心 | Low -load feed water temperature's device among improvement turbine unit |
| CN207006111U (en) * | 2017-07-28 | 2018-02-13 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of device for improving thermal power plant denitrating flue gas reaction temperature |
| CN107830510A (en) * | 2017-11-17 | 2018-03-23 | 程晋瑞 | A kind of wide load of new vapour source of fired power generating unit high-pressure heater carries effect and out of stock technological system and matching process |
| CN108613164A (en) * | 2018-04-08 | 2018-10-02 | 大唐(北京)能源管理有限公司 | The feed heating system of denitration effect under a kind of improvement underload |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754343A (en) * | 2022-04-11 | 2022-07-15 | 峰和轻碳(北京)设计研究院有限公司 | Wide-load denitration system and adjusting method considering stable combustion performance of boiler |
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