CN104785104B - A kind of relatively low remodeling method of inlet flue gas temperature for solving power plant boiler denitrification apparatus - Google Patents
A kind of relatively low remodeling method of inlet flue gas temperature for solving power plant boiler denitrification apparatus Download PDFInfo
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- CN104785104B CN104785104B CN201510158404.8A CN201510158404A CN104785104B CN 104785104 B CN104785104 B CN 104785104B CN 201510158404 A CN201510158404 A CN 201510158404A CN 104785104 B CN104785104 B CN 104785104B
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Abstract
The present invention relates to the renovation technique of the denitrification apparatus of power plant boiler, the relatively low remodeling method of specifically a kind of inlet flue gas temperature for solving power plant boiler denitrification apparatus.The present invention solves the problems, such as that the inlet flue gas temperature of SCR denitration device is too low causes SCR denitration device run.A kind of relatively low remodeling method of inlet flue gas temperature for solving power plant boiler denitrification apparatus, the method is realized using following steps：A. thermal power plant's data are collected；B. economizer exit flue-gas temperature, is enrolled in the coordinate system of MATLAB as vertical coordinate using unit load as abscissa；C. between horizontal low temperature superheater entrance and economizer exit additional bypass flue is installed；D. the vertical low temperature overheater exit gas temperature under different unit loads, economizer exit flue-gas temperature are substituted into heat balance equation；E. several as-fired coal actually used for thermal power plant is chemically examined.The present invention is applied to the transformation of the denitrification apparatus of power plant boiler.
Description
Technical field
The present invention relates to the renovation technique of the denitrification apparatus of power plant boiler, specifically a kind of solution power plant boiler denitration
The relatively low remodeling method of the inlet flue gas temperature of device.
Background technology
At present, thermal power plant in terms of denitration more adopts selective catalytic reduction（SCR）Denitration technology.Selective catalysis are also
Former method（SCR）Because of which, denitration technology has the advantages that denitration rate is higher, stable, it has also become power plant boiler denitration both at home and abroad
The mainstream technology of comparative maturity.
The back-end surfaces of power plant boiler have typically been sequentially arranged reversal chamber, vertical low in vertical well gas flue from high to low
Warm superheater, horizontal low temperature superheater, economizer, SCR denitration device, air preheater etc..Wherein, SCR denitration device is typically arranged
After economizer, before air preheater.
At this stage, due to the large-scale grid connection of new forms of energy, the frequent peak regulation of electrical network, fired power generating unit is caused to be chronically at change negative
Run under lotus, and when fired power generating unit is run under underload, the inlet flue gas temperature of SCR denitration device is relatively low.However,
The inlet flue gas temperature that SCR denitration device is required is 315-400 DEG C, if inlet flue gas temperature is too low, cannot meet minimum continuous spray ammonia cigarette
Temperature requirement, thus causes SCR denitration device run.
This is based on, in order to ensure that SCR denitration device is normally run, it is necessary to which invention is a kind of to solve power plant boiler denitration dress
The relatively low remodeling method of the inlet flue gas temperature put.
Content of the invention
The present invention causes SCR denitration device run in order to the inlet flue gas temperature that solves the problems, such as SCR denitration device is too low,
Provide a kind of relatively low remodeling method of inlet flue gas temperature for solving power plant boiler denitrification apparatus.
The present invention adopts the following technical scheme that realization：A kind of solve power plant boiler denitrification apparatus inlet flue gas temperature compared with
Low remodeling method, the method are realized using following steps：
A. thermal power plant's data are collected；Thermal power plant's data include：The annual unit load scope of thermal power plant and difference
Vertical low temperature overheater exit gas temperature, horizontal low temperature superheater exit gas temperature under unit load, economizer exit
Flue-gas temperature；
B. economizer exit flue-gas temperature is enrolled the seat of MATLAB as vertical coordinate using unit load as abscissa
In mark system, and it is fitted with smooth curve, fitting degree highest curve is defined as economizer exit flue gas temperature then
Degree and the relation curve of unit load；
According to the meansigma methodss of coal-fired power plant sulfur content, the optimal reaction temperature of catalyst in SCR denitration device is determined, and
By the optimal reaction temperature, on above-mentioned relation curve, corresponding unit load is defined as the minimum machine that disclosure satisfy that denitration input
Group load；
C. bypass flue, and the entrance in bypass flue are installed additional between horizontal low temperature superheater entrance and economizer exit
Baffle plate is set；
The load point of the unit load as bypass flue baffle plate standard-sized sheet of the annual minimum unit load of slightly below thermal power plant is taken,
And the vertical low temperature overheater exit gas temperature under the load point, economizer exit flue-gas temperature are substituted into equation of heat balance
Formula, it follows that the share of the bypass exhaust gas volumn under the load point；
According to the permission flue gas flow rate of SCR denitration device entrance, bypass flue aperture area is determined；
D. the vertical low temperature overheater exit gas temperature under different unit loads, economizer exit flue-gas temperature are substituted into
Heat balance equation, it follows that the share of the bypass exhaust gas volumn under different unit loads；
By the share of the bypass exhaust gas volumn under the share of the bypass exhaust gas volumn under different unit loads and above-mentioned load point
Ratio using unit load as abscissa, is enrolled in the coordinate system of MATLAB, and is intended with smooth curve as vertical coordinate
Close, then fitting degree highest curve is defined as the relation curve of bypass flue baffle opening and unit load；
E. several as-fired coal actually used for thermal power plant is chemically examined, it follows that the share of its various composition；Root
According to the share of various composition, thermodynamic computing is carried out to installing the operating mode under the different unit loads before and after bypass flue additional, thus
Go out to install additional cigarette temperature, Temperature of Working and exhaust gas temperature and boiler efficiency that each heating surface of boiler before and after bypass flue is imported and exported.
A kind of relatively low remodeling method of inlet flue gas temperature for solving power plant boiler denitrification apparatus of the present invention passes through
Bypass flue is installed additional between horizontal low temperature superheater entrance and economizer exit so that SCR denitration device entrance flue gas temperature is carried
Height has arrived the optimal reaction temperature of catalyst, has thus fully met minimum continuous spray ammonia cigarette temperature and has required, so as to be effectively ensured
The normal operation of SCR denitration device.
The present invention efficiently solves the inlet flue gas temperature of SCR denitration device too low causes what SCR denitration device cannot run to ask
Topic, it is adaptable to the transformation of the denitrification apparatus of power plant boiler.
Specific embodiment
A kind of relatively low remodeling method of inlet flue gas temperature for solving power plant boiler denitrification apparatus, the method are using following step
Rapid realization：
A. thermal power plant's data are collected；Thermal power plant's data include：The annual unit load scope of thermal power plant and difference
Vertical low temperature overheater exit gas temperature, horizontal low temperature superheater exit gas temperature under unit load, economizer exit
Flue-gas temperature；
B. economizer exit flue-gas temperature is enrolled the seat of MATLAB as vertical coordinate using unit load as abscissa
In mark system, and it is fitted with smooth curve, fitting degree highest curve is defined as economizer exit flue gas temperature then
Degree and the relation curve of unit load；
According to the meansigma methodss of coal-fired power plant sulfur content, the optimal reaction temperature of catalyst in SCR denitration device is determined, and
By the optimal reaction temperature, on above-mentioned relation curve, corresponding unit load is defined as the minimum machine that disclosure satisfy that denitration input
Group load；
C. bypass flue, and the entrance in bypass flue are installed additional between horizontal low temperature superheater entrance and economizer exit
Baffle plate is set；
The load point of the unit load as bypass flue baffle plate standard-sized sheet of the annual minimum unit load of slightly below thermal power plant is taken,
And the vertical low temperature overheater exit gas temperature under the load point, economizer exit flue-gas temperature are substituted into equation of heat balance
Formula, it follows that the share of the bypass exhaust gas volumn under the load point；
According to the permission flue gas flow rate of SCR denitration device entrance, bypass flue aperture area is determined；
D. the vertical low temperature overheater exit gas temperature under different unit loads, economizer exit flue-gas temperature are substituted into
Heat balance equation, it follows that the share of the bypass exhaust gas volumn under different unit loads；
By the share of the bypass exhaust gas volumn under the share of the bypass exhaust gas volumn under different unit loads and above-mentioned load point
Ratio using unit load as abscissa, is enrolled in the coordinate system of MATLAB, and is intended with smooth curve as vertical coordinate
Close, then fitting degree highest curve is defined as the relation curve of bypass flue baffle opening and unit load；
E. several as-fired coal actually used for thermal power plant is chemically examined, it follows that the share of its various composition；Root
According to the share of various composition, thermodynamic computing is carried out to installing the operating mode under the different unit loads before and after bypass flue additional, thus
Go out to install additional cigarette temperature, Temperature of Working and exhaust gas temperature and boiler efficiency that each heating surface of boiler before and after bypass flue is imported and exported.
In step b, if the meansigma methodss 2.166% of coal-fired power plant sulfur content, catalyst in SCR denitration device
Optimal reaction temperature is 317 DEG C, disclosure satisfy that the minimum unit load of denitration input is 240MW；In step c, cigarette is bypassed
The load point of road baffle plate standard-sized sheet is 150MW, and the share of the bypass exhaust gas volumn under the load point is 10.533%, and SCR denitration device enters
The permission flue gas flow rate of mouth is less than 15m/s, and bypass flue aperture area is 1.6532.
In step c, non-metal expansion joint is set in the horizontal segment leading portion and vertical section back segment of bypass flue.
In step c, homogenizing plate is set in the vertical section of bypass flue.Homogenizing plate enables to flue gas flow rate uniformly,
As far as possible so that by the flue gas flow distribution of catalyst rationally.
Claims (4)
1. a kind of relatively low remodeling method of inlet flue gas temperature for solving power plant boiler denitrification apparatus, it is characterised in that：The method is
Realized using following steps：
A. thermal power plant's data are collected；Thermal power plant's data include：The annual unit load scope of thermal power plant and different units
Vertical low temperature overheater exit gas temperature, horizontal low temperature superheater exit gas temperature under load, economizer exit flue gas
Temperature；
B. economizer exit flue-gas temperature is enrolled the coordinate system of MATLAB as vertical coordinate using unit load as abscissa
In, and be fitted with smooth curve, then by fitting degree highest curve be defined as economizer exit flue-gas temperature with
The relation curve of unit load；
According to the meansigma methodss of coal-fired power plant sulfur content, the optimal reaction temperature of catalyst in SCR denitration device is determined, and should
Optimal reaction temperature corresponding unit load on above-mentioned relation curve is defined as disclosure satisfy that the minimum unit of denitration input is born
Lotus；
C. install bypass flue between horizontal low temperature superheater entrance and economizer exit additional, and the entrance in bypass flue is arranged
Baffle plate；
The load point of the unit load as bypass flue baffle plate standard-sized sheet of the annual minimum unit load of slightly below thermal power plant is taken, and will
Vertical low temperature overheater exit gas temperature under the load point, economizer exit flue-gas temperature substitute into heat balance equation, by
This draws the share of the bypass exhaust gas volumn under the load point；
According to the permission flue gas flow rate of SCR denitration device entrance, bypass flue aperture area is determined；
D. the vertical low temperature overheater exit gas temperature under different unit loads, economizer exit flue-gas temperature are substituted into heat and are put down
Weighing apparatus equation, it follows that the share of the bypass exhaust gas volumn under different unit loads；
Ratio by the share of the bypass exhaust gas volumn under the share of the bypass exhaust gas volumn under different unit loads and above-mentioned load point
As vertical coordinate, using unit load as abscissa, enroll in the coordinate system of MATLAB, and be fitted with smooth curve,
Then fitting degree highest curve is defined as the relation curve of bypass flue baffle opening and unit load；
E. several as-fired coal actually used for thermal power plant is chemically examined, it follows that the share of its various composition；According to each
The share of kind of composition, carries out thermodynamic computing to installing the operating mode under the different unit loads before and after bypass flue additional, it follows that plus
Cigarette temperature, Temperature of Working and exhaust gas temperature and boiler efficiency that before and after dress bypass flue, each heating surface of boiler is imported and exported.
2. a kind of relatively low remodeling method of inlet flue gas temperature for solving power plant boiler denitrification apparatus according to claim 1,
It is characterized in that：In step b, if the meansigma methodss 2.166% of coal-fired power plant sulfur content, catalyst in SCR denitration device
Optimal reaction temperature be 317 DEG C, disclosure satisfy that denitration input minimum unit load be 240MW；In step c, bypass
The load point of damper standard-sized sheet is 150MW, and the share of the bypass exhaust gas volumn under the load point is 10.533%, SCR denitration device
The permission flue gas flow rate of entrance is less than 15m/s, and bypass flue aperture area is 1.6532.
3. a kind of relatively low remodeling method of inlet flue gas temperature for solving power plant boiler denitrification apparatus according to claim 1,
It is characterized in that：In step c, non-metal expansion joint is set in the horizontal segment leading portion and vertical section back segment of bypass flue.
4. a kind of relatively low remodeling method of inlet flue gas temperature for solving power plant boiler denitrification apparatus according to claim 1,
It is characterized in that：In step c, homogenizing plate is set in the vertical section of bypass flue.
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| CN105126616B (en) * | 2015-08-20 | 2017-04-19 | 南京柏亚德环保工程有限公司 | SCR denitration system ammonia spraying optimization method based on weight valve regulation and control |
| CN109012068A (en) * | 2018-10-17 | 2018-12-18 | 上海外高桥第二发电有限责任公司 | It is a kind of for administering the Emission Optimization method of white plume |
| CN112287535B (en) * | 2020-10-21 | 2023-03-31 | 国网山东省电力公司电力科学研究院 | Method and system for determining minimum operation load of thermal power generating unit |
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| CN203862139U (en) * | 2014-05-30 | 2014-10-08 | 内蒙古瑞特科技有限公司 | Denitration system for flue |
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