CN105435597A - System for improving denitration operation rate of Siemens 1000MW/600MW ultra-supercritical unit - Google Patents
System for improving denitration operation rate of Siemens 1000MW/600MW ultra-supercritical unit Download PDFInfo
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- CN105435597A CN105435597A CN201510990598.8A CN201510990598A CN105435597A CN 105435597 A CN105435597 A CN 105435597A CN 201510990598 A CN201510990598 A CN 201510990598A CN 105435597 A CN105435597 A CN 105435597A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8696—Controlling the catalytic process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D2257/40—Nitrogen compounds
- B01D2257/402—Dinitrogen oxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2259/4591—Construction elements containing cleaning material, e.g. catalysts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
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Abstract
The invention discloses a system for improving denitration operation rate of a Siemens 1000MW/600MW ultra-supercritical unit, which comprises a denitration device, a boiler, a high-pressure cylinder and a high-pressure heater, wherein when the unit operates in low load, a feed water heating steam source of the high-pressure heater is switched to a 0-section steam suction system from original 1-section steam suction, the 0-section steam suction system comprises that the steam is sucked out reversely from a supply steam inlet of the high-pressure cylinder, the sucked steam enters a steam cooler to be cooled and decompressed to adapt to safe and feed water temperature requirement of the high-pressure heater after passing through an electric gate and a pneumatic check valve, and the cooled and decompressed steam is divided into A and B branches which are respectively introduced to 1A and 1B high-pressure heaters through electric gates, and the system is provided with dredging pipelines according to the pipe arrangement condition and operation requirements. The system is used for solving the problem that denitration is limited when the Siemens 1000MW/600MW ultra-supercritical unit is in a low-load operation mode, and is simple and easy to operate, and small in change of the existing structure and low in investment.
Description
Technical field
The present invention relates to denitration technology field, coal-burning power plant, particularly relating to a kind of system for improving Siemens 1000MW/600MW extra-supercritical unit denitration operational percentage.
Background technology
At present, coal-burning power plant's denitrification apparatus is mostly SCR class, and the usual operating temperature range of catalyst of employing is 300-400 DEG C, exceedes temperature range catalyst and can not play due effect.In conventional thermal power plant design, there are the following problems in meeting: when unit load is higher, denitrification apparatus import cigarette temperature (economizer exit cigarette temperature) is just in time at catalyst normal operation range; And when unit load is lower, denitrification apparatus import cigarette temperature is lower, lower than the normal serviceability temperature of catalyst.This is because if the juice import cigarette temperature of establishing of denitrification apparatus is brought up to the service requirement meeting catalyst when underload, then when high load capacity, cigarette Wen Huigeng is high, thus causes exhaust gas temperature to raise, and makes the economy of unit reduce.Therefore, generally all by meeting lower exhaust gas temperature to design when high load capacity, this will cause power plant denitrification apparatus off-the-line can only be run when underload.This has been not suitable with the requirement of up-to-date power plant's discharged nitrous oxides standard.
Fired power generating unit steam turbine side water supply heat back system and economizer exit cigarette temperature (denitrification apparatus entrance) matched design, when unit load is lower, its feed temperature is also corresponding lower.Existing Siemens 1000MW/600MW extra-supercritical unit water supply heat back system all designs according to mentioned above principle, when facing performing low-load running of machine set, and the problem causing denitrification apparatus out of service because of feed temperature low (economizer exit cigarette temperature is low).
Summary of the invention
The object of the present invention is to provide a kind of system for improving Siemens 1000MW/600MW extra-supercritical unit denitration operational percentage, this system is simple to operation, and to unit existing structure change little, invest low.
In order to solve the problem of above-mentioned technology, the technical solution used in the present invention is: a kind of system for improving Siemens 1000MW/600MW extra-supercritical unit denitration operational percentage, comprise denitrification apparatus, boiler, high pressure cylinder and high-pressure heater, when performing low-load running of machine set, the feedwater of high-pressure heater adds hot vapour source and draws gas by former 1 section and switch to 0 section of steam bleeding system, described 0 section of steam bleeding system comprises: from high pressure cylinder filling, import department oppositely extracts steam out, draw gas through electric gate valve, after Pneumatic check valve, enter steam temp lowering device and carry out desuperheat, reduce pressure with adapt to high-pressure heater safety and to the requirement of water temperature, desuperheat, after decompression, steam divides A, B two also accesses 1A respectively through electric gate valve, 1B high-pressure heater, described system is according to pipe arrangement situation and operation requirement, be provided with hydrophobic pipeline.
Further, pneumatic control valve is provided with between described Pneumatic check valve and steam temp lowering device.
Further, desuperheating water is drawn from reheater warm water mother, after hand stop valve, filter, Flow-rate adjustment is carried out by main other two-way control valve group, and then merge into mother and spray into steam temp lowering device after non-return valve, described desuperheating water master, bypass valve group are made up of 1 pneumatic stopping valve, 1 pneumatic control valve and 1 hand stop valve respectively.
Further, described steam temp lowering device is provided with safety valve.
Further, pipeline between described aeration valve and electric gate valve is provided with hydrophobic pipeline, pipeline between described electric gate valve and Pneumatic check valve is provided with hydrophobic pipeline, the pipeline between described steam temp lowering device and high-pressure heater is provided with hydrophobic pipeline.
The principle that the present invention is based on is: by improving the feed temperature of running on the lower load pusher side, to make boiler economizer export the corresponding raising of cigarette temperature, thus reaches the object improving denitrification apparatus operational percentage.
System for improving Siemens 1000MW/600MW extra-supercritical unit denitration operational percentage provided by the invention increases by drawing gas of road high parameter to high-pressure heater to add hot vapour source, the original filling import of unit high pressure cylinder is taken from this vapour source, and it has former the drawing gas of higher pressure heater and adds the higher parameter of hot vapour source.When performing low-load running of machine set, the feedwater of high-pressure heater adds hot vapour source and draws gas by former 1 section and switch to 0 section draw gas (newly-increased systematic naming method is 0 section and draws gas), thus feed temperature is improved, and to put into operation needs to adapt to denitrification apparatus.0 section of steam bleeding system comprises: oppositely extract steam (now filling valve is in closed condition to isolate main steam) out from high pressure cylinder filling import department, draw gas through electric gate valve, after Pneumatic check valve, enter pneumatic control valve and steam temp lowering device (band safety valve is in case system overpressure) and carry out desuperheat, the safety and the feedwater temperature increase requirement that reduce pressure to adapt to high-pressure heater, desuperheat, after decompression, steam divides A, B two also accesses 1A high-pressure heater and 1B high-pressure heater respectively through electric gate valve, system is according to pipe arrangement situation and operation requirement, necessary hydrophobic pipeline is set.
Desuperheating water is drawn from reheater desuperheat jellyfish pipe (taking from heat pump centre tap), after hand stop valve, filter, 0 section of requirement of drawing gas is met for making spray water flux, Flow-rate adjustment is carried out by master, other two-way control valve group, and then merge into female pipe, and spray into attemperator after non-return valve.Desuperheating water master, bypass valve group are made up of 1 hand stop valve after 1 pneumatic stopping valve, 1 pneumatic control valve respectively.
The invention solves the problem that the denitration of Siemens 1000MW/600MW extra-supercritical unit running on the lower load is limited, and system is simple to operation, to unit existing structure change little, invest low.
The present invention also can be used for newly-built Turbo-generator Set, namely when water supply heat back system designs, unit is kept normally to draw gas parameter constant (maintain the best of unit economy draw gas parameter), set up the vapour source of drawing gas for subsequent use of a road high parameter to high-pressure heater, to meet denitration requirement under unit running on the lower load simultaneously.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form inappropriate limitation of the present invention, in the accompanying drawings:
Fig. 1 is a kind of schematic diagram for improving Siemens 1000MW/600MW extra-supercritical unit denitration operational percentage of the embodiment of the present invention 1, and wherein cloud atlas region is part of the present invention, i.e. 0 section of steam bleeding system.
Fig. 2 is 0 section of steam bleeding system flow chart of the embodiment of the present invention 1.
Fig. 3 is a kind of schematic diagram for improving Siemens 1000MW/600MW extra-supercritical unit denitration operational percentage of the embodiment of the present invention 2, and wherein cloud atlas region is part of the present invention, i.e. 0 section of steam bleeding system.
Fig. 4 is 0 section of steam bleeding system flow chart of the embodiment of the present invention 2.
In accompanying drawing, 1 is that the original filling valve of unit, 2 is electric gate valve, 4 is Pneumatic check valve, 6 is pneumatic control valve, 7 is steam temp lowering device, 8 is safety valve, 9 is electric gate valve, 11 is electric gate valve, 12 is flowmeter, 13 is hand stop valve, 14 is filter, 15 is pneumatic stopping valve, 16 is pneumatic control valve, 17 is hand stop valve, 18 is non-return valve, 19 is pneumatic stopping valve, 20 is pneumatic control valve, 21 is hand stop valve for pipeline hydrophobic pipeline, 10 after attemperator for pipeline hydrophobic pipeline, 5 after electric gate valve for pipeline hydrophobic pipeline, 3 after filling valve.
Detailed description of the invention
Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as a limitation of the invention.
Embodiment 1
As Fig. 1, shown in 2, a kind of system for improving Siemens 1000MW/600MW extra-supercritical unit denitration operational percentage, comprise denitrification apparatus, boiler, high pressure cylinder and high-pressure heater, when performing low-load running of machine set, the feedwater of high-pressure heater adds hot vapour source and draws gas by former 1 section and switch to 0 section of steam bleeding system, 0 section of newly-increased flow process of drawing gas is: oppositely extract steam (now filling valve no longer needs to utilize its original function) out from high pressure cylinder filling import department, in the present embodiment, filling valve is as pneumatil control valve, draw gas through electric gate valve 3, after pneumatic check-valves 5, enter steam temp lowering device 7 (band safety valve 8 is in case system overpressure) and carry out desuperheat, the safety and the feedwater temperature increase requirement that reduce pressure to adapt to high-pressure heater, desuperheat, after decompression, steam divides A, B two also accesses 1A high-pressure heater and 1B high-pressure heater respectively through electric gate valve 10 and electric gate valve 11, system is according to pipe arrangement situation and operation requirement, necessary hydrophobic pipeline is set, as in figure 2, 4 and 9.When unit meets lower, is then drawn gas by former 1 section in the vapour source of high-pressure heater and switch to 0 section and draw gas, thus improve pusher side feed temperature, to meet denitrification apparatus inlet flue gas temperature requirement (boiler economizer outlet cigarette temperature).
0 section of steam bleeding system desuperheating water flow process is: desuperheating water is drawn from feed pump reheater desuperheat jellyfish pipe, after flowmeter 12, hand stop valve 13 and filter 14, point main, other two-way control valve group carries out Flow-rate adjustment (opening bypass valve group again when main road is discontented with traffic requirement), and then merge into female pipe, and spray into steam temp lowering device after non-return valve 18.Main (side) road control valve group respectively by pneumatic stopping valve 15,19, pneumatic control valve 16,20 and hand stop valve 17,21 form.
Embodiment 2
With reference to accompanying drawing 3, 4, 0 section of newly-increased flow process of drawing gas is: oppositely extract steam (now filling valve is in closed condition to isolate main steam) out from high pressure cylinder filling import department, draw gas through electric gate valve 3, after pneumatic check-valves 5, enter pneumatic control valve 6 and steam temp lowering device 7 (band safety valve 8 is in case system overpressure) carries out desuperheat, the safety and the feedwater temperature increase requirement that reduce pressure to adapt to high-pressure heater, desuperheat, after decompression, steam divides A, B two also accesses 1A high-pressure heater and 1B high-pressure heater respectively through electric gate valve 10 and electric gate valve 11, system is according to pipe arrangement situation and operation requirement, necessary hydrophobic pipeline is set, as in figure 2, 4 and 9.When unit meets lower, is then drawn gas by former 1 section in the vapour source of No. 1 high-pressure heater and switch to 0 section and draw gas, thus improve pusher side feed temperature, to meet denitrification apparatus inlet flue gas temperature requirement (boiler economizer outlet cigarette temperature).
0 section of steam bleeding system desuperheating water flow process is: desuperheating water is drawn from feed pump reheater desuperheat jellyfish pipe, after flowmeter 12, hand stop valve 13 and filter 14, point main, other two-way control valve group carries out Flow-rate adjustment (opening bypass valve group again when main road is discontented with traffic requirement), and then merge into female pipe, and spray into steam temp lowering device after non-return valve 18.Main (side) road control valve group is made up of pneumatic stopping valve 15 (19), pneumatic control valve 16 (20) and hand stop valve 17 (21) respectively.
Above the technical scheme that the embodiment of the present invention provides is described in detail, apply specific case herein to set forth the principle of the embodiment of the present invention and embodiment, the explanation of above embodiment is only applicable to the principle helping to understand the embodiment of the present invention; Meanwhile, for one of ordinary skill in the art, according to the embodiment of the present invention, detailed description of the invention and range of application all will change, and in sum, this description should not be construed as limitation of the present invention.
Claims (5)
1. one kind for improving the system of Siemens 1000MW/600MW extra-supercritical unit denitration operational percentage, comprise denitrification apparatus, boiler, high pressure cylinder and high-pressure heater, it is characterized in that: when performing low-load running of machine set, the feedwater of high-pressure heater adds hot vapour source and draws gas by former 1 section and switch to 0 section of steam bleeding system, described 0 section of steam bleeding system comprises: from high pressure cylinder filling, import department oppositely extracts steam out, draw gas through electric gate valve, after Pneumatic check valve, enter steam temp lowering device and carry out desuperheat, reduce pressure with adapt to high-pressure heater safety and to the requirement of water temperature, desuperheat, after decompression, steam divides A, B two also accesses 1A respectively through electric gate valve, 1B high-pressure heater, described system is according to pipe arrangement situation and operation requirement, be provided with hydrophobic pipeline.
2. a kind of system for improving Siemens 1000MW/600MW extra-supercritical unit denitration operational percentage according to claim 1, is characterized in that: be provided with pneumatic control valve between described Pneumatic check valve and steam temp lowering device.
3. a kind of system for improving Siemens 1000MW/600MW extra-supercritical unit denitration operational percentage according to claim 1 and 2, it is characterized in that: desuperheating water is drawn from reheater warm water mother, after hand stop valve, filter, Flow-rate adjustment is carried out by main other two-way control valve group, and then merge into mother and spray into steam temp lowering device after non-return valve, described desuperheating water master, other control valve group are made up of 1 pneumatic stopping valve, 1 pneumatic control valve and 1 hand stop valve respectively.
4. a kind of system for improving Siemens 1000MW/600MW extra-supercritical unit denitration operational percentage according to claim 3, is characterized in that: described steam temp lowering device is provided with safety valve.
5. a kind of system for improving Siemens 1000MW/600MW extra-supercritical unit denitration operational percentage according to claim 1, is characterized in that: be provided with hydrophobic pipeline after described filling valve, electric gate valve, steam temp lowering device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510990598.8A CN105435597A (en) | 2015-12-23 | 2015-12-23 | System for improving denitration operation rate of Siemens 1000MW/600MW ultra-supercritical unit |
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| CN201510990598.8A CN105435597A (en) | 2015-12-23 | 2015-12-23 | System for improving denitration operation rate of Siemens 1000MW/600MW ultra-supercritical unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN106122934A (en) * | 2016-07-06 | 2016-11-16 | 大唐(北京)能源管理有限公司 | A kind of across unit heat regenerative system and method |
| CN109340736A (en) * | 2018-08-24 | 2019-02-15 | 浙江浙能技术研究院有限公司 | A kind of ultra-supercritical boiler reheater second level attemperator protection system |
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| CN205235724U (en) * | 2015-12-23 | 2016-05-18 | 广东惠州平海发电厂有限公司 | System for be used for improving siemens 1000MW600MW ultra supercritical unit denitration rate of putting into operation |
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Patent Citations (4)
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| JP5791429B2 (en) * | 2011-08-29 | 2015-10-07 | 株式会社タクマ | Exhaust gas treatment system and exhaust gas treatment method |
| CN102537933A (en) * | 2011-12-30 | 2012-07-04 | 冯伟忠 | Adjustable feed water heat regenerative system for turbo generator unit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106122934A (en) * | 2016-07-06 | 2016-11-16 | 大唐(北京)能源管理有限公司 | A kind of across unit heat regenerative system and 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 |
| CN109340736A (en) * | 2018-08-24 | 2019-02-15 | 浙江浙能技术研究院有限公司 | A kind of ultra-supercritical boiler reheater second level attemperator protection system |
| CN109340736B (en) * | 2018-08-24 | 2024-04-09 | 浙江浙能技术研究院有限公司 | Two-stage desuperheater protection system for ultra-supercritical boiler reheater |
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Application publication date: 20160330 |
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