CN115121101B - Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power unit - Google Patents
Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power unit Download PDFInfo
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- CN115121101B CN115121101B CN202210442489.2A CN202210442489A CN115121101B CN 115121101 B CN115121101 B CN 115121101B CN 202210442489 A CN202210442489 A CN 202210442489A CN 115121101 B CN115121101 B CN 115121101B
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—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
- B01D53/8621—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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
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Abstract
The application provides a method for adjusting the temperature of a smoke inlet end of an SCR system in a thermal power generating unit, which comprises the following steps: a heating unit is arranged between a smoke discharging end of the thermal power generating unit and a smoke inlet end of the SCR system; acquiring the required power of a power grid; setting a power threshold of the power grid; comparing the required power of the power grid with a power threshold; if the required power is smaller than the power threshold, the power of the heating unit is increased to increase the flue gas temperature of the flue gas inlet end of the SCR system. According to the method for adjusting the temperature of the smoke inlet end of the SCR system in the thermal power generating unit, disclosed by the application, the power of the heating unit is increased, so that the smoke of the smoke inlet end of the SCR system is heated, the temperature of the smoke inlet end of the SCR system is finally improved, and the stable denitration of the SCR system is ensured. Therefore, the deep peak regulation of the thermal power unit is not limited by the SCR system, and the realization of a flexible operation mode of the thermal power unit is ensured.
Description
Technical Field
The application relates to the technical field of thermal power units, in particular to a method for adjusting the temperature of a smoke inlet end of an SCR (selective catalytic reduction) system in a thermal power unit.
Background
Thermal power plants are usually denitrated by an SCR (Selective Catalytic Reduction ) system to prevent the environment from being polluted by excessive nitrogen oxides generated in the boiler.
Meanwhile, in order to meet different electricity requirements, peak regulation is required for the generated energy of the thermal power unit, but denitration cannot be performed when the temperature of the smoke inlet end of the SCR system is low, so that the thermal power unit needs to maintain higher operation load, and the thermal power unit cannot be deeply regulated in the peak regulation process, so that the realization of flexible operation of the thermal power unit is affected.
Disclosure of Invention
The present application aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the application aims to provide a method for adjusting the temperature of the smoke inlet end of an SCR system in a thermal power generating unit.
In order to achieve the above purpose, the application provides a method for adjusting the temperature of a smoke inlet end of an SCR system in a thermal power generating unit, comprising the following steps: a heating unit is arranged between the smoke discharging end of the thermal power generating unit and the smoke inlet end of the SCR system; acquiring the required power of a power grid; setting a power threshold of the power grid; comparing the required power of the power grid to the power threshold; and if the required power is smaller than the power threshold, increasing the power of the heating unit to increase the flue gas temperature of the flue gas inlet end of the SCR system.
Optionally, the adjusting method further includes: after the power of the heating unit is increased, setting a flue gas temperature threshold of a flue gas inlet end of the SCR system; acquiring the flue gas temperature of a flue gas inlet end of the SCR system; comparing the flue gas temperature of the flue gas inlet end of the SCR system with the flue gas temperature threshold; and adjusting the power of the heating unit according to the comparison result so that the flue gas temperature of the flue gas inlet end of the SCR system is equal to the flue gas temperature threshold.
Optionally, said adjusting the power of the heating unit according to the result of the comparison comprises: if the flue gas temperature of the flue gas inlet end of the SCR system is larger than the flue gas temperature threshold, reducing the power of the heating unit; and if the flue gas temperature of the flue gas inlet end of the SCR system is smaller than the flue gas temperature threshold value, increasing the power of the heating unit.
Optionally, obtaining the flue gas temperature of the flue gas inlet end of the SCR system includes: a first temperature detection unit is arranged at a smoke inlet end of the SCR system; and acquiring the flue gas temperature of the flue gas inlet end of the SCR system according to the first temperature detection unit.
Optionally, the adjusting method further includes: a second temperature detection unit is arranged at the smoke exhaust end of the thermal power generating unit; and acquiring the flue gas temperature of the smoke discharging end of the thermal power generating unit according to the second temperature detection unit.
Optionally, the flue gas temperature threshold is 300 degrees celsius.
Optionally, the power threshold is 30% of the rated power of the power grid.
Optionally, the adjusting method further includes: the power utilization end of the heating unit is electrically connected with the power supply end of the thermal power generating unit, and the heating unit is connected with the power grid in parallel; and adjusting the power generation power of the thermal power generating unit according to the power of the heating unit and the required power of the power grid.
Optionally, the electrically connecting the power end of the heating unit with the power supply end of the thermal power generating unit, and connecting the heating unit in parallel with the power grid includes: electrically connecting a power supply end of the thermal power generating unit with a power utilization end of a first transformer, and enabling the first transformer to be connected with the power grid in parallel; electrically connecting a power supply end of the first transformer with a power utilization end of the second transformer; and electrically connecting the power supply end of the second transformer with the power utilization end of the heating unit.
Optionally, the adjusting method further includes: a first switch is arranged between the power supply end of the first transformer and the power utilization end of the second transformer; and a second switch is arranged between the power supply end of the second transformer and the power utilization end of the heating unit.
The technical scheme provided by the application can comprise the following beneficial effects:
the power of the heating unit is increased, so that the flue gas at the flue gas inlet end of the SCR system is heated, the flue gas temperature at the flue gas inlet end of the SCR system is finally improved, and the stable denitration of the SCR system is ensured. Therefore, the deep peak regulation of the thermal power unit is not limited by the SCR system, and the realization of a flexible operation mode of the thermal power unit is ensured.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic flow chart of a method for adjusting a smoke inlet end temperature of an SCR system in a thermal power generating unit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a method for adjusting a smoke inlet end temperature of an SCR system in a thermal power generating unit according to an embodiment of the present application;
as shown in the figure: 1. the system comprises a thermal power unit, 2, an SCR system, 3, a heating unit, 4, a power grid, 5, a first temperature detection unit, 6, a second temperature detection unit, 7, a first transformer, 8, a second transformer, 9, a first switch, 10, a second switch, 11, a boiler, 12, a steam turbine, 13 and a generator.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application. On the contrary, the embodiments of the application include all alternatives, modifications and equivalents as may be included within the spirit and scope of the appended claims.
In a related embodiment, the smoke discharging end of the thermal power generating unit 1 is connected with the smoke inlet end of the SCR (Selective Catalytic Reduction ) system 2, and the power supplying end of the thermal power generating unit 1 is connected with the power using end of the power grid 4.
It is understood that the thermal power generating unit 1 supplies power to the power grid 4, and flue gas exhausted by the thermal power generating unit 1 is subjected to denitration through the SCR system 2.
Under different required powers of the power grid 4, the generated power of the thermal power generating unit 1 also changes, namely when the required power of the power grid 4 is high, the generated power of the thermal power generating unit 1 needs to be regulated up, and when the required power of the power grid 4 is low, the generated power of the thermal power generating unit 1 needs to be regulated down. Thereby, the peak shaving of the thermal power generating unit 1 is realized.
However, since the denitration of the SCR system 2 requires a higher temperature of the flue gas at the flue gas inlet end, and since the flue gas temperature at the flue gas outlet end is also lower when the power generation power of the thermal power generating unit 1 is lower, the power generation power of the thermal power generating unit 1 is limited from being reduced under the limitation of the SCR system 2, and the deep peak regulation requirement of the thermal power generating unit 1 cannot be met.
In order to solve the above technical problems, as shown in fig. 1, an embodiment of the present application provides a method for adjusting a temperature of a smoke inlet end of an SCR system 2 in a thermal power generating unit 1, including:
s1: a heating unit 3 is arranged between the smoke discharging end of the thermal power generating unit 1 and the smoke inlet end of the SCR system 2;
s2: acquiring the required power of the power grid 4;
s3: setting a power threshold of the power grid 4;
s4: comparing the required power of the power grid 4 with a power threshold;
s5: if the required power is less than the power threshold, the power of the heating unit 3 is increased to increase the flue gas temperature at the flue gas inlet end of the SCR system 2.
It can be understood that when the required power of the power grid 4 is smaller than the power threshold, after the peak regulation, the smoke temperature at the smoke outlet end of the thermal power generating unit 1 is correspondingly lower, and correspondingly, the smoke temperature at the smoke inlet end of the SCR system 2 is also lower, and the smoke at the smoke inlet end of the SCR system 2 is heated by increasing the power of the heating unit 3, so that the smoke temperature at the smoke inlet end of the SCR system 2 is finally improved, and the stable denitration of the SCR system 2 is ensured. Therefore, the deep peak regulation of the thermal power unit 1 is not limited by the SCR system 2, and the realization of a flexible operation mode of the thermal power unit 1 is ensured.
The required power of the power grid 4 is the power required by the power grid 4, and when the power consumption is large, the required power of the power grid 4 is larger, and when the power consumption is small, the required power of the power grid 4 is smaller.
The power supply end refers to an electric quantity output end, and the power utilization end refers to an electric quantity input end.
In some embodiments, as shown in fig. 2, the heating unit 3 may include a heating chamber and a heating wire, the heating chamber has a smoke inlet end and a smoke outlet end, the smoke inlet end of the heating chamber is connected to the smoke outlet end of the thermal power generating unit 1, the smoke outlet end of the heating chamber is connected to the smoke inlet end of the SCR system 2, and the heating wire is disposed in the heating chamber. Therefore, by increasing the power of the heating wire, the flue gas is heated when passing through the heating chamber, and the flue gas temperature of the flue gas inlet end of the SCR system 2 is increased.
In some embodiments, S4 and S5 may be performed by a controller, as shown in fig. 2, a power supply terminal of the controller is connected to a power use terminal of the heating wire, and power of the heating wire is controlled by the controller.
In some embodiments, as shown in fig. 2, the thermal power generating unit 1 may include a boiler 11, a steam turbine 12 and a generator 13, where the steam outlet end of the boiler 11 is connected to the steam inlet end of the steam turbine 12, the smoke outlet end of the boiler 11 is connected to the smoke inlet end of the SCR system 2, the output shaft of the steam turbine 12 is connected to the input shaft of the generator 13, and the power supply end of the generator 13 is connected to the power utilization end of the power grid 4.
In some embodiments, the conditioning method further comprises:
after increasing the power of the heating unit 3, S6: setting a flue gas temperature threshold of a flue gas inlet end of the SCR system 2;
s7: acquiring the flue gas temperature of a flue gas inlet end of the SCR system 2;
s8: comparing the flue gas temperature of the flue gas inlet end of the SCR system 2 with a flue gas temperature threshold;
s9: and adjusting the power of the heating unit 3 according to the comparison result so that the flue gas temperature of the flue gas inlet end of the SCR system 2 is equal to the flue gas temperature threshold.
It can be understood that after the flue gas temperature of the flue gas inlet end of the SCR system 2 is improved, the flue gas temperature of the flue gas inlet end of the SCR system 2 is maintained at the set flue gas temperature threshold value through the power adjustment of the heating unit 3, so that the problem that the energy loss is excessive due to the fact that the flue gas inlet end of the SCR system 2 is continuously heated is avoided, the heating cost of the flue gas inlet end of the SCR system 2 is effectively reduced, the problem that the shutdown of the SCR system 2 occurs due to the fact that the flue gas inlet end of the SCR system 2 is too low is also avoided, and the deep peak shaving of the thermal power unit 1 is not limited.
The power of the heating unit 3 was calculated as E d The flue gas thermometer at the flue gas inlet end of the SCR system 2 is set as T o The smoke temperature at the smoke discharging end of the thermal power generating unit 1 is counted as T i The smoke enthalpy value H of the smoke inlet end of the SCR system 2 yo The method comprises the following steps:
H yo ＝h(T o )；
the smoke enthalpy value of the smoke inlet end of the SCR system 2 is a function of the smoke temperature of the smoke inlet end of the SCR system 2;
flue gas enthalpy value H of flue gas discharging end of thermal power generating unit 1 yi The method comprises the following steps:
H yi ＝h(T i )；
the smoke enthalpy value of the smoke discharging end of the thermal power generating unit 1 is a function of the smoke temperature of the smoke discharging end of the thermal power generating unit 1;
power E of heating unit 3 d The method comprises the following steps:
E d ＝Q y (H yi -H yo )；
the power of the heating unit 3 is a function of the difference between the smoke enthalpy value of the smoke discharging end of the thermal power generating unit 1 and the smoke enthalpy value of the smoke inlet end of the SCR system 2;
simultaneously, the thermal power generating unit1 is given by E g The thermal load of the thermal power generating unit 1 is calculated as Q b The thermal efficiency of the thermal power generating unit 1 is eta cp Power E of thermal power generating unit 1 g The method comprises the following steps:
E g ＝Q b ×η cp ；
T i ＝g(Q b )；
i.e. the flue gas temperature at the smoke discharging end of the thermal power generating unit 1 is a function of the power of the thermal power generating unit 1;
therefore, when the power of the thermal power generating unit 1 is lower, the smoke temperature of the smoke discharging end of the thermal power generating unit 1 is lower, meanwhile, the smoke temperature of the smoke inlet end of the SCR system 2 can be improved by increasing the power of the heating unit 3, and the smoke temperature of the smoke inlet end of the SCR system 2 can be reduced by reducing the power of the heating unit 3.
In some embodiments, S7 to S9 may be performed by a controller that adjusts the power of the heating unit 3 according to the comparison of the flue gas temperature at the flue gas inlet end of the SCR system 2 and the flue gas temperature threshold.
In some embodiments, in S9, adjusting the power of the heating unit 3 according to the result of the comparison includes:
if the flue gas temperature of the flue gas inlet end of the SCR system 2 is greater than the flue gas temperature threshold value, reducing the power of the heating unit 3;
if the flue gas temperature at the flue gas inlet end of the SCR system 2 is smaller than the flue gas temperature threshold value, the power of the heating unit 3 is increased.
It can be understood that the power of the heating unit 3 is reduced or increased by utilizing the positive correlation between the power of the heating unit 3 and the smoke temperature of the smoke inlet end of the SCR system 2, so that the smoke temperature of the smoke inlet end of the SCR system 2 is maintained at a smoke temperature threshold, the problem that the energy loss is excessive due to the fact that the smoke inlet end of the SCR system 2 is continuously heated is avoided, the heating cost of the smoke inlet end of the SCR system 2 is effectively reduced, the problem that the SCR system 2 is stopped due to the fact that the smoke inlet end of the SCR system 2 is too low is also avoided, and the deep peak shaving of the thermal power generating unit 1 is not limited.
In some embodiments, in S7, obtaining the flue gas temperature of the flue gas inlet end of the SCR system 2 includes:
a first temperature detection unit 5 is arranged at the smoke inlet end of the SCR system 2;
and acquiring the smoke temperature of the smoke inlet end of the SCR system 2 according to the first temperature detection unit 5.
It can be understood that the first temperature detecting unit 5 is used for obtaining the smoke temperature of the smoke inlet end of the SCR system 2, so that the power of the heating unit 3 is adjusted by using the smoke temperature of the smoke inlet end of the SCR system 2.
In some embodiments, as shown in fig. 2, the first temperature detecting unit 5 may be a temperature sensor, and a signal output end of the temperature sensor is electrically connected to a signal input end of the controller. Thereby, the temperature sensor converts the temperature of the flue gas at the flue gas inlet end of the SCR system 2 into an electrical signal and sends the electrical signal to the controller, and the controller adjusts the power of the heating unit 3 according to the electrical signal.
In some embodiments, the conditioning method further comprises:
a second temperature detection unit 6 is arranged at the smoke exhaust end of the thermal power generating unit 1;
and acquiring the flue gas temperature of the smoke discharging end of the thermal power generating unit 1 according to the second temperature detection unit 6.
It can be understood that the smoke temperature of the smoke discharging end of the thermal power generating unit 1 is obtained through the second temperature detection unit 6, so that the smoke temperature of the smoke discharging end of the thermal power generating unit 1 can be conveniently monitored, and the smoke temperature of the smoke discharging end of the thermal power generating unit 1 can be utilized to more accurately adjust the power of the heating unit 3.
In some embodiments, as shown in fig. 2, the second temperature detecting unit 6 may be a temperature sensor, and a signal output end of the temperature sensor is electrically connected to a signal input end of the controller.
In some embodiments, the flue gas temperature threshold is 300 degrees celsius.
It can be understood that after the smoke temperature threshold is set to 300 ℃, the power of the heating unit 3 is continuously increased, the adjustment is started until the smoke temperature of the smoke inlet end of the SCR system 2 exceeds 300 ℃, so that the smoke temperature of the smoke inlet end of the SCR system 2 is maintained at 300 ℃ and the stable denitration of the SCR system 2 is ensured.
In some embodiments, the power threshold is 30% of the rated power of the power grid 4.
It can be understood that when the required power of the power grid 4 is lower than 30% of the rated power, the heat load of the thermal power generating unit 1 is also lower than 30% by peak regulation, and at this time, the flue gas temperature at the smoke discharging end of the thermal power generating unit 1 is reduced, so that the flue gas temperature at the smoke inlet end of the SCR system 2 cannot meet the denitration requirement, and the deep peak regulation of the thermal power generating unit 1 is realized and meanwhile the SCR system 2 can still stabilize denitration after the power of the heating unit 3 is increased.
In some embodiments, the conditioning method further comprises:
as shown in fig. 2, the power end of the heating unit 3 is electrically connected with the power supply end of the thermal power generating unit 1, and the heating unit 3 is connected in parallel with the power grid 4;
the generated power of the thermal power generating unit 1 is regulated according to the power of the heating unit 3 and the required power of the power grid 4.
It can be appreciated that the thermal power generating unit 1 supplies power to the heating unit 3, so that the use of additional power supply components is avoided, the heating cost of smoke at the smoke inlet end of the CR system is effectively reduced, and the heating unit 3 is connected with the power grid 4 in parallel, so that the power of the thermal power generating unit 1 is equal to the sum of the required power of the power grid 4 and the power of the heating unit 3, the generated power of the thermal power generating unit 1 is conveniently controlled, and the flexible operation of the thermal power generating unit 1 is realized.
In some embodiments, as shown in fig. 2, electrically connecting the power end of the heating unit 3 with the power supply end of the thermal power generating unit 1, and connecting the heating unit 3 in parallel with the power grid 4 includes:
the power supply end of the thermal power generating unit 1 is electrically connected with the power utilization end of the first transformer 7, and the first transformer 7 is connected with the power grid 4 in parallel;
electrically connecting the power supply end of the first transformer 7 with the power utilization end of the second transformer 8;
the power supply end of the second transformer 8 is electrically connected to the power utilization end of the heating unit 3.
It can be appreciated that the power supply of the thermal power generating unit 1 can be adapted to the power consumption of the heating unit 3 through the arrangement of the first transformer 7 and the second transformer 8, so that the thermal power generating unit 1 can stably supply power to the heating unit 3.
In some embodiments, the first transformer 7 may be a high-power plant.
The high-voltage power supply unit is a special transformer for converting a high-voltage system into a low-voltage system to supply power to a plant where the thermal power generating unit 1 is located.
The power of the first transformer 7 is counted as E c The required power meter of the power network 4 is E w Power E of thermal power generating unit 1 g The method comprises the following steps:
E g ＝E w +E c ；
and E is c Includes E d Therefore, the power E of the thermal power generating unit 1 g When set up, the power E should be required in the power grid 4 w On the basis of which the power E of the first transformer 7 is increased c And after the heating unit 3 is added, the power E of the heating unit 3 should also be increased d 。
In some embodiments, as shown in fig. 2, the adjustment method further comprises:
a first switch 9 is arranged between the power supply end of the first transformer 7 and the power utilization end of the second transformer 8;
a second switch 10 is arranged between the power supply terminal of the second transformer 8 and the power utilization terminal of the heating unit 3.
It can be appreciated that the arrangement of the first switch 9 and the second switch 10 facilitates the control of the second transformer 8 and the switch of the heating unit 3, so that the heating of the smoke at the smoke inlet end of the SCR system 2 is safer.
It should be noted that in the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (9)
1. A method for adjusting the temperature of a smoke inlet end of an SCR system in a thermal power generating unit is characterized by comprising the following steps:
a heating unit is arranged between the smoke discharging end of the thermal power generating unit and the smoke inlet end of the SCR system;
acquiring the required power of a power grid;
setting a power threshold of the power grid;
comparing the required power of the power grid to the power threshold;
if the required power is smaller than the power threshold, increasing the power of the heating unit to increase the flue gas temperature of the flue gas inlet end of the SCR system;
wherein the adjustment method further comprises:
the power utilization end of the heating unit is electrically connected with the power supply end of the thermal power generating unit, and the heating unit is connected with the power grid in parallel;
and adjusting the power generation power of the thermal power generating unit according to the power of the heating unit and the required power of the power grid.
2. The method for adjusting the temperature of the smoke inlet end of an SCR system in a thermal power plant according to claim 1, wherein the adjusting method further comprises:
after the power of the heating unit is increased, setting a flue gas temperature threshold of a flue gas inlet end of the SCR system;
acquiring the flue gas temperature of a flue gas inlet end of the SCR system;
comparing the flue gas temperature of the flue gas inlet end of the SCR system with the flue gas temperature threshold;
and adjusting the power of the heating unit according to the comparison result so that the flue gas temperature of the flue gas inlet end of the SCR system is equal to the flue gas temperature threshold.
3. The method for adjusting the temperature of the smoke inlet end of an SCR system in a thermal power generating unit according to claim 2, wherein said adjusting the power of the heating unit according to the result of said comparison comprises:
if the flue gas temperature of the flue gas inlet end of the SCR system is larger than the flue gas temperature threshold, reducing the power of the heating unit;
and if the flue gas temperature of the flue gas inlet end of the SCR system is smaller than the flue gas temperature threshold value, increasing the power of the heating unit.
4. The method for adjusting the temperature of a smoke inlet end of an SCR system in a thermal power generating unit according to claim 2, wherein obtaining the temperature of smoke at the smoke inlet end of the SCR system comprises:
a first temperature detection unit is arranged at a smoke inlet end of the SCR system;
and acquiring the flue gas temperature of the flue gas inlet end of the SCR system according to the first temperature detection unit.
5. The method for adjusting the temperature of the smoke inlet end of an SCR system in a thermal power plant according to claim 2, wherein the adjusting method further comprises:
a second temperature detection unit is arranged at the smoke exhaust end of the thermal power generating unit;
and acquiring the flue gas temperature of the smoke discharging end of the thermal power generating unit according to the second temperature detection unit.
6. The method of adjusting a smoke inlet end temperature of an SCR system in a thermal power generating unit according to claim 2, wherein the smoke temperature threshold is 300 ℃.
7. The method of claim 1, wherein the power threshold is 30% of the rated power of the power grid.
8. The method for adjusting the temperature of the smoke inlet end of an SCR system in a thermal power plant according to claim 1, wherein the electrically connecting the power end of the heating unit with the power supply end of the thermal power plant, and connecting the heating unit in parallel with the power grid comprises:
electrically connecting a power supply end of the thermal power generating unit with a power utilization end of a first transformer, and enabling the first transformer to be connected with the power grid in parallel;
electrically connecting a power supply end of the first transformer with a power utilization end of the second transformer;
and electrically connecting the power supply end of the second transformer with the power utilization end of the heating unit.
9. The method for adjusting the temperature of the smoke inlet end of an SCR system in a thermal power plant according to claim 8, wherein said adjusting method further comprises:
a first switch is arranged between the power supply end of the first transformer and the power utilization end of the second transformer;
and a second switch is arranged between the power supply end of the second transformer and the power utilization end of the heating unit.
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