CN206449679U - A kind of varying duty Secondary Air constant temperature system - Google Patents
A kind of varying duty Secondary Air constant temperature system Download PDFInfo
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- CN206449679U CN206449679U CN201621086460.1U CN201621086460U CN206449679U CN 206449679 U CN206449679 U CN 206449679U CN 201621086460 U CN201621086460 U CN 201621086460U CN 206449679 U CN206449679 U CN 206449679U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model belongs to thermal power industry Thermal generation unit field, a kind of varying duty Secondary Air constant temperature system that specially Thermal generation unit is applied in wide load operation, pressure fan, which is kept watch, to be sent in air preheater, air after air preheater enters boiler, the flue gas produced after boiler combustion is discharged after desulfurizing tower desulfurization by chimney, the steam air heater being connected with heat regenerative system is provided with the pipeline of connection pressure fan and air preheater, second level low-level (stack-gas) economizer is provided between heat regenerative system and steam air heater.Relative to prior art, the utility model is in unit underload or winter operation, and the condensate in heat regenerative system absorbs low-temperature flue gas heat through second level low-level (stack-gas) economizer；The condensate after low-temperature flue gas heat is absorbed, into cold Secondary Air steam air heater heat release to heat cold wind, the technical scheme can further reduce flue gas heat, improve unit efficiency；And the cold Secondary Air entrance wind-warm syndrome of air preheater can be raised, reduce air preheater cold end corrosion and ensure Secondary Air constant temperature.
Description
Technical field
The utility model belongs to thermal power industry Thermal generation unit field, and specially Thermal generation unit is in wide load
A kind of varying duty Secondary Air constant temperature system applied during operation.
Background technology
With the fast development of China's economy, the proportion of residential electricity consumption and commercial power increases year by year, causes power load
Peak-valley difference increases sharply so that 600MW levels and 1000MW grades of extra-supercritical units according to being designed with base load must not be not involved in adjusting
Peak, and it is generally in underrun.Counted according to the running situation of national active service 1000MW extra-supercritical units, less than 70%
The hours of operation of unit accounts for 35% under load.Henan Province 1000MW grades of unit operation load most time operates in 75-50%
Between THA loads, the shared hourage of summer 100%THA operations is only 585h.
When coal unit is in underrun, the exhaust gas temperature of boiler is relatively low, and the heat exchange of air preheater is not enough to completely
The temperature requirement of sufficient secondary air system, can be impacted to boiler efficiency；When temperature is relatively low in the winter time, the cold Secondary Air of air preheater enters
One's intention as revealed in what one says temperature is relatively low, now can cause cold end corrosion to air preheater.In order to improve boiler operating efficiency, cold end corrosion is reduced pre- to sky
The damage of device equipment, can set cold Secondary Air steam air heater before air preheater.
Station boiler flue gas loss is a most important heat loss in boiler operatiopn, account for boiler heat loss 60%~
70%.In order to reduce flue gas loss, exhaust gas temperature is reduced, the energy is saved, the economy of power plant is improved, boiler smoke system can be with
Low-level (stack-gas) economizer is set.
Flue-gas temperature can be down to 90 DEG C or so by country's Conventional cryogenic economizer at present, and flue gas is carried out into desulfurizing tower afterwards
Wet desulphurization is handled, and the flue gas after final process passes through smoke stack emission.The optimal reaction temperature of wet desulphurization is about 50 DEG C or so,
Higher flue-gas temperature can cause the increase of desulfurization water consumption, and cause humidity of flue gas to increase.Wet desulphurization optimal reaction temperature
There is the larger temperature difference between Conventional cryogenic economizer flue gas exit temperature, the partial heat can be utilized.
Utility model content
The technical problems to be solved in the utility model is：During existing coal unit variable load operation, desulfurizing tower inlet flue gas
Secondary air temperature is relatively low when the waste and underrun of heat, to solve the above problems, providing a kind of varying duty Secondary Air constant temperature
System.
The purpose of this utility model is realized in the following manner：
A kind of varying duty Secondary Air constant temperature system, pressure fan, which is kept watch, to be sent in air preheater, the sky after air preheater
Gas enters boiler, and the flue gas produced after boiler combustion is discharged after desulfurizing tower desulfurization by chimney, pre- in connection pressure fan and sky
The steam air heater being connected with heat regenerative system is provided with the pipeline of device, the second grade low-temp province is provided between heat regenerative system and steam air heater
Coal device.
It is provided between second level low-level (stack-gas) economizer and heat regenerative system on pipeline IV, pipeline IV and is disposed with motorized adjustment
Valve I, booster pump II.
When the inlet temperature of second level low-level (stack-gas) economizer can not meet second level low-level (stack-gas) economizer service requirement, pipeline IV
Outlet of the interior condensate through second level low-level (stack-gas) economizer is imported to the second grade low-temp into low-level (stack-gas) economizer recirculation conduit and saved
Electric control valve II is provided with the entrance of coal device, low-level (stack-gas) economizer recirculation conduit.
Second level low-level (stack-gas) economizer VII imports backheat by the road to pipeline VI, the outlet of steam air heater is provided between steam air heater
System, is provided with steam air heater bypass duct, steam air heater bypass duct between pipeline VI and the outlet of steam air heater and is provided with electricity
The rear end with steam air heater bypass duct junction is provided with electric check valve IV on dynamic regulating valve III, pipeline VII.
Heat sink is provided with the pipeline of air preheater to desulfurizing tower.
Air preheater is to being provided with deduster, air-introduced machine and second level low-level (stack-gas) economizer on the pipeline of desulfurizing tower.
Heat sink is that the first order low-level (stack-gas) economizer back segment and the first grade low-temp for being arranged on air-introduced machine front-end and back-end are saved
After condensate heats up through first order low-level (stack-gas) economizer back segment and first order low-level (stack-gas) economizer leading portion in coal device leading portion, heat regenerative system,
It is back to heat regenerative system.
Multiple one-level low-pressure heaters are provided with heat regenerative system, one of one-level low-pressure heating in heat regenerative system
The entrance and exit of device takes condensate to enter first order low-level (stack-gas) economizer back segment and first order low-level (stack-gas) economizer leading portion through booster pump I
After middle absorption heat, V it is back to by the road in heat regenerative system.
The entrance and exit of one-level low-pressure heater is connected by pipeline I and pipeline II respectively with booster pump I, on pipeline I
It is provided with electric check valve I, pipeline II and is provided with electric check valve II, electric check valve III is provided with pipeline V.
Relative to prior art, the utility model is in unit underload or winter operation, the condensate in heat regenerative system
Low-temperature flue gas heat is absorbed through second level low-level (stack-gas) economizer；The condensate after low-temperature flue gas heat is absorbed, it is warm into cold Secondary Air
Wind device heat release is to heat cold wind, the technical scheme, can further reduce flue gas heat, improves unit efficiency；And sky can be raised
The pre- cold Secondary Air entrance wind-warm syndrome of device, reduces air preheater cold end corrosion and ensures Secondary Air constant temperature.
Brief description of the drawings
Fig. 1 is the utility model structural representation.
Wherein, 1 is pipeline I；2 be electric check valve I；3 be pipeline II；4 be electric check valve II；5 be pipeline III；6 are
Booster pump I；7 be first order low-level (stack-gas) economizer back segment；8 be first order low-level (stack-gas) economizer leading portion；9 be electric check valve III；10 are
Pipeline IV；11 be electric control valve I；12 be booster pump II；13 be second level low-level (stack-gas) economizer；14 be low-level (stack-gas) economizer recycling
Pipeline；15 be electric control valve II；16 be steam air heater；17 be steam air heater bypass duct；18 be electric control valve III；19 be electronic
Stop valve IV；20 be pressure fan；21 be pipeline V；22 be pipeline VI；23 be air preheater；24 be deduster；25 be air-introduced machine；26
It is desulfurizing tower；27 be chimney；28 be pipeline VII；29 be one-level low-pressure heater.
Embodiment
As shown in figure 1, a kind of varying duty Secondary Air constant temperature system, pressure fan 20, which is kept watch, to be sent in air preheater 23, through sky
Air after air preheater enters boiler, and the flue gas produced after boiler combustion is discharged after the desulfurization of desulfurizing tower 26 by chimney 27,
The steam air heater 16 being connected with heat regenerative system, heat regenerative system and warm wind are provided with the pipeline of connection pressure fan 20 and air preheater 23
Second level low-level (stack-gas) economizer 13 is provided between device 16.
It is provided between second level low-level (stack-gas) economizer 13 and heat regenerative system on pipeline IV 10, pipeline IV 10 and is disposed with electricity
Dynamic regulating valve I 11, booster pump II 12.
When the inlet temperature of second level low-level (stack-gas) economizer 13 can not meet the second level 13 service requirement of low-level (stack-gas) economizer, pipe
Outlet of the condensate through second level low-level (stack-gas) economizer 13 in road IV 10 is imported into low-level (stack-gas) economizer recirculation conduit 14
Electric control valve II 15 is provided with the entrance of two grade low-temp economizers 13, low-level (stack-gas) economizer recirculation conduit 14.
Second level low-level (stack-gas) economizer 13 is to being provided with pipeline VI 22 between steam air heater 16, the outlet of steam air heater 16 by the road VII
28 import heat regenerative system, are provided between the outlet of pipeline VI 22 and steam air heater 16 by steam air heater bypass duct 17, steam air heater
It is provided with electric control valve III 18, pipeline VI 22 and is set with the rear end of the junction of steam air heater bypass duct 17 on road pipeline 17
There is electric check valve IV 19.
Heat sink is provided with the pipeline of air preheater 23 to desulfurizing tower 26.
Air preheater 23 is to being provided with deduster 24, air-introduced machine 25 and second level low-level (stack-gas) economizer on the pipeline of desulfurizing tower 26
13。
Heat sink is the first order low-level (stack-gas) economizer back segment 7 and the first grade low-temp for being arranged on the front-end and back-end of air-introduced machine 25
Condensate is through 8 liters of first order low-level (stack-gas) economizer back segment 7 and first order low-level (stack-gas) economizer leading portion in economizer leading portion 8, heat regenerative system
Wen Hou, is back to heat regenerative system.
Multiple one-level low-pressure heaters 29 are provided with heat regenerative system, one of one-level low pressure in heat regenerative system adds
The entrance and exit of hot device 29 takes condensate to enter first order low-level (stack-gas) economizer back segment 7 and the first grade low-temp province coal through booster pump I 6
Absorb after heat, V 21 be back to by the road in heat regenerative system in device leading portion 8.
The entrance and exit of one-level low-pressure heater 29 is connected by pipeline I 1 and pipeline II 3 respectively with booster pump I 6, pipe
It is provided with road I 1 on electric check valve I 2, pipeline II 3 and is provided with electric check valve II 4, electronic section is provided with pipeline V 21
Only valve III 9.
Operation principle and the course of work of the present utility model are：
In coal unit underrun or winter operation, the utility model is installed on Thermal generation unit therrmodynamic system
In.It is solidifying that the utility model is first order low-level (stack-gas) economizer back segment 7, first order low-level (stack-gas) economizer leading portion 8 utilizes high-temperature flue gas to heat
Bear water, squeeze extracted steam from turbine；Second level low-level (stack-gas) economizer 13 exports the low temperature cigarette at the import of desulfurizing tower 26 using air-introduced machine 25
Gas heat-setting water, the condensate after heating is used to heat cold Secondary Air, maintains Secondary Air constant temperature.
Condensate is taken in certain entrance and exit of one-level low-pressure heater 29, by the road I 1 and electric check valve I 2 thereon
Electric check valve II 4 with pipeline II 3 and thereon enters system progress mixing and confluxed；Condensate after confluxing through pipeline 5,
Booster pump I 6 enters first order low-level (stack-gas) economizer back segment 7 and first order low-level (stack-gas) economizer leading portion 8 absorbs high-temperature flue gas heat；Absorb
Condensate after flue gas heat returns to certain one-level low-pressure heater 29 through pipeline 5 and electric check valve III 9 and exported；
Condensate is taken in other certain one-level low-pressure heater 29 outlet, by the road IV 10 and electric control valve I thereon
11st, booster pump II 12 enters the absorption low-temperature flue gas heat of second level low-level (stack-gas) economizer 13；The entrance of second level low-level (stack-gas) economizer 13 coagulates
When bearing water temperature and being unsatisfactory for the second level 13 service requirement of low-level (stack-gas) economizer, through low-level (stack-gas) economizer recirculation conduit 14 and electric control valve
II 15 are recycled；Meet after the service requirement of second level low-level (stack-gas) economizer 13, absorb the condensate by the road VI of flue gas heat
22 enter steam air heaters 16, and heat release is to heat cold Secondary Air in steam air heater 16；Steam air heater bypass duct 17 and electric adjustable thereon
Valve III 18 is saved according to the parameter adjustment aperture such as load and wind-warm syndrome, the condensation that a part of second level low-level (stack-gas) economizer 13 of by-pass flow is exported
Water；After the condensate and the condensate of steam air heater bypass duct 17 that steam air heater 16 is exported conflux, by the road VII 28 and electricity thereon
Dynamic stop valve IV 19, enters certain inlet duct of one-level low-pressure heater 29.
Claims (9)
1. a kind of varying duty Secondary Air constant temperature system, it is characterised in that：Pressure fan, which is kept watch, to be sent in air preheater, through air preheat
Air after device enters boiler, and the flue gas produced after boiler combustion is discharged after desulfurizing tower desulfurization by chimney, in connection air-supply
The steam air heater being connected with heat regenerative system is provided with the pipeline of machine and air preheater, second is provided between heat regenerative system and steam air heater
Grade low-temp economizer.
2. a kind of varying duty Secondary Air constant temperature system according to claim 1, it is characterised in that：Second level low-level (stack-gas) economizer
It is provided between heat regenerative system on pipeline IV, pipeline IV and is disposed with electric control valve I, booster pump II.
3. a kind of varying duty Secondary Air constant temperature system according to claim 2, it is characterised in that：When the second grade low-temp saves coal
When the inlet temperature of device can not meet second level low-level (stack-gas) economizer service requirement, the condensate in pipeline IV is saved through the second grade low-temp
The outlet of coal device is imported to the entrance of second level low-level (stack-gas) economizer into low-level (stack-gas) economizer recirculation conduit, and low-level (stack-gas) economizer is followed again
Electric control valve II is provided with endless tube road.
4. a kind of varying duty Secondary Air constant temperature system according to claim 2, it is characterised in that：Second level low-level (stack-gas) economizer
To pipeline VI is provided between steam air heater, the outlet of steam air heater VII imports heat regenerative system by the road, in pipeline VI and steam air heater
Be provided between outlet on steam air heater bypass duct, steam air heater bypass duct and be provided with electric control valve III, on pipeline VII with
The rear end of steam air heater bypass duct junction is provided with electric check valve IV.
5. a kind of varying duty Secondary Air constant temperature system according to claim 1, it is characterised in that：In air preheater to desulfurizing tower
Pipeline on be provided with heat sink.
6. a kind of varying duty Secondary Air constant temperature system according to claim 5, it is characterised in that：Air preheater is to desulfurizing tower
Deduster, air-introduced machine and second level low-level (stack-gas) economizer are provided with pipeline.
7. a kind of varying duty Secondary Air constant temperature system according to claim 6, it is characterised in that：Heat sink is to be arranged on
Condensate in the first order low-level (stack-gas) economizer back segment and first order low-level (stack-gas) economizer leading portion of air-introduced machine front-end and back-end, heat regenerative system
After first order low-level (stack-gas) economizer back segment and the heating of first order low-level (stack-gas) economizer leading portion, heat regenerative system is back to.
8. a kind of varying duty Secondary Air constant temperature system according to claim 7, it is characterised in that：It is provided with heat regenerative system
Multiple one-level low-pressure heaters, the entrance and exit of one of one-level low-pressure heater in heat regenerative system takes condensate to pass through
Booster pump I, which enters in first order low-level (stack-gas) economizer back segment and first order low-level (stack-gas) economizer leading portion, to be absorbed after heat, V is returned by the road
It is back in heat regenerative system.
9. a kind of varying duty Secondary Air constant temperature system according to claim 8, it is characterised in that：One-level low-pressure heater
Entrance and exit is connected by pipeline I and pipeline II respectively with booster pump I, and electric check valve I, pipeline II are provided with pipeline I
On be provided with electric check valve II, pipeline V and be provided with electric check valve III.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621086460.1U CN206449679U (en) | 2016-09-28 | 2016-09-28 | A kind of varying duty Secondary Air constant temperature system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621086460.1U CN206449679U (en) | 2016-09-28 | 2016-09-28 | A kind of varying duty Secondary Air constant temperature system |
Publications (1)
| Publication Number | Publication Date |
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| CN206449679U true CN206449679U (en) | 2017-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621086460.1U Expired - Fee Related CN206449679U (en) | 2016-09-28 | 2016-09-28 | A kind of varying duty Secondary Air constant temperature system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109114583A (en) * | 2018-09-26 | 2019-01-01 | 西安交通大学 | A kind of coal fired power plant smoke waste heat utilization system and working method |
| CN110594769A (en) * | 2019-10-16 | 2019-12-20 | 福建龙净环保股份有限公司 | Flue gas treatment system |
| CN113280508A (en) * | 2021-06-22 | 2021-08-20 | 西安热工研究院有限公司 | System and method for determining optimal inlet air temperature of thermal power generating unit with air heater |
-
2016
- 2016-09-28 CN CN201621086460.1U patent/CN206449679U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109114583A (en) * | 2018-09-26 | 2019-01-01 | 西安交通大学 | A kind of coal fired power plant smoke waste heat utilization system and working method |
| CN109114583B (en) * | 2018-09-26 | 2024-01-09 | 西安交通大学 | Flue gas waste heat utilization system of coal-fired power plant and working method |
| CN110594769A (en) * | 2019-10-16 | 2019-12-20 | 福建龙净环保股份有限公司 | Flue gas treatment system |
| CN113280508A (en) * | 2021-06-22 | 2021-08-20 | 西安热工研究院有限公司 | System and method for determining optimal inlet air temperature of thermal power generating unit with air heater |
| CN113280508B (en) * | 2021-06-22 | 2022-05-03 | 西安热工研究院有限公司 | System and method for determining optimal inlet air temperature of thermal power generating unit with air heater |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 450007 Zhengzhou Zhongyuan Road, Henan, No. 212 Patentee after: China Electric Power Construction Group Henan electric survey and Design Institute Co., Ltd. Address before: 450007 Zhengzhou Zhongyuan Road, Henan, No. 212 Patentee before: Hennan Electric Power Survey & Design Institute |
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| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170829 Termination date: 20190928 |
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| CF01 | Termination of patent right due to non-payment of annual fee |