CN218295694U - Boiler and power generation system with fused salt heating flue gas - Google Patents
Boiler and power generation system with fused salt heating flue gas Download PDFInfo
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- CN218295694U CN218295694U CN202221461291.0U CN202221461291U CN218295694U CN 218295694 U CN218295694 U CN 218295694U CN 202221461291 U CN202221461291 U CN 202221461291U CN 218295694 U CN218295694 U CN 218295694U
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Abstract
The utility model provides a boiler and power generation system with fused salt heating flue gas. The utility model discloses a boiler with fused salt heating flue gas, include: a boiler body having a flue; the inlet of the SCR flue gas denitration device is communicated with the outlet of the flue; the flue gas heating device comprises a heat exchanger, the heat exchanger is located in the flue, and the heat exchanger is used for heating flue gas in the flue. Therefore, according to the utility model discloses a boiler with fused salt heating flue gas has the advantage of the SCR flue gas denitration device operation of being convenient for reduce pollutant emission.
Description
Technical Field
The utility model relates to a boiler technical field, concretely relates to boiler and power generation system with fused salt heating flue gas.
Background
During the realization of a flexible operation mode of the thermal power generating unit, wide-load denitration is one of key problems restricting the down-regulation of the load depth of the unit. According to the existing domestic denitration process of the thermal power generating unit, an SCR selective catalytic reduction method (hereinafter referred to as SCR) is commonly adopted, the denitration process requires that the temperature of flue gas at an SCR inlet is 300-400 ℃, and if the temperature of the flue gas is lower than 300 ℃, an SCR system cannot realize the denitration function. In the related technology, when the load of the operated thermal power generating unit is reduced to about 40% of rated load, the temperature of the flue gas at the inlet of the SCR is reduced to be below 300 ℃, and is lower than the safe operation range specified by regulations, and the SCR system needs to quit operation, so that more pollutants are contained in the flue gas of the boiler.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. To this end, the embodiment of the utility model provides a boiler and power generation system with fused salt heating flue gas.
The utility model discloses boiler with fused salt heating flue gas, include:
a boiler body having a flue;
the inlet of the SCR flue gas denitration device is communicated with the outlet of the flue;
the flue gas heating device comprises a heat exchanger, the heat exchanger is located in the flue, and the heat exchanger is used for heating flue gas in the flue.
Therefore, according to the utility model discloses thereby boiler has the advantage of the SCR flue gas denitration device operation of being convenient for reduce pollutant discharge.
In some embodiments, the flue gas heating apparatus further comprises
The high-temperature molten salt tank and the low-temperature molten salt tank are used for storing molten salt;
the outlet of the high-temperature molten salt tank is communicated with the inlet of the heat exchanger through the first pipeline;
the outlet of the heat exchanger is communicated with the inlet of the low-temperature molten salt tank through a second pipeline;
the outlet of the low-temperature molten salt tank is communicated with the inlet of the high-temperature molten salt tank through a third pipeline;
the first heater is arranged on the third pipeline and used for heating the molten salt in the third pipeline.
In some embodiments, the flue gas heating device further comprises a flow control valve provided on the first pipeline, the flow cross section of the flow control valve being variable.
In some embodiments, the flue gas heating apparatus further comprises a first temperature detector and a second temperature detector, at least part of the first temperature detector and at least part of the second temperature detector are both located in the flue, and the heat exchanger is located between at least part of the first temperature detector and at least part of the second temperature detector in a flue gas flow direction in the flue.
In some embodiments, the flue gas heating device further comprises a controller, the controller is electrically connected with the first temperature detector, the second temperature detector and the flow control valve, and the controller can be used for controlling the size of the through-flow section of the flow control valve.
In some embodiments, the flue gas heating apparatus further comprises
The first pump body is arranged on the first pipeline and is positioned between the flow control valve and an inlet of the first pipeline;
and the second pump body is arranged on the third pipeline and is positioned between an inlet of the third pipeline and the first heater.
In some embodiments, the heat exchanger is located within the flue and adjacent to an outlet of the flue.
The utility model also provides a power generation system, include
The boiler is the boiler with the fused salt heating flue gas;
and the steam outlet of the boiler is communicated with the inlet of the steam turbine generator set, and the steam turbine generator set is connected with a power grid.
In some embodiments, the utility model discloses a power generation system includes high factory transformer and transformer, steam turbine generator set high factory transformer with the transformer links to each other in proper order, the boiler is foretell boiler that has fused salt heating flue gas, the boiler includes first heater, first heater is electric heater, first heater with the transformer links to each other.
In some embodiments, the utility model discloses a power generation system includes high factory transformer and transformer, steam turbine generator set high factory transformer with the transformer links to each other in proper order, the boiler is foretell boiler that has fused salt heating flue gas, the boiler includes the heat exchanger, the heat exchanger is the second heater, the second heater is electric heater, the second heater with the transformer links to each other.
Drawings
Fig. 1 is a schematic diagram of a power generation system according to an embodiment of the present invention.
Reference numerals:
The system comprises a boiler 1 for heating flue gas by fused salt, a steam pipeline 2, a flue 3, an SCR flue gas denitration device 4, a heat exchanger 5, a high-temperature fused salt tank 6, a low-temperature fused salt tank 7, a first pipeline 8, a second pipeline 9, a third pipeline 10, a first heater 11, a flow control valve 12, a first temperature detector 13, a second temperature detector 14, a controller 15, a first pump body 16, a second pump body 17, a steam turbine 18, a generator set 19, a steam turbine generator set 20, a high-rise transformer 21, a transformer 22 and an electric network 23.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
The boiler 1 with molten salt heating flue gas of the embodiment of the present invention is described below with reference to the drawings. As shown in FIG. 1, the boiler 1 with molten salt heating flue gas according to the embodiment of the present invention comprises a boiler body, an SCR flue gas denitration device 4 and a flue gas heating device.
The boiler body has a flue 3. And the inlet of the SCR flue gas denitration device 4 is communicated with the outlet of the flue 3. The flue gas heating device comprises a heat exchanger 5, the heat exchanger 5 is positioned in the flue 3, and the heat exchanger 5 is used for heating flue gas in the flue 3.
According to the utility model discloses boiler 1 with fused salt heating flue gas is through setting up the heat exchanger 5 that is used for heating the flue gas in flue 3. Thereby can make thermal power generating unit when the load is lower, when having the exhaust gas temperature of boiler 1 of fused salt heating flue gas lower, the flue gas in heat exchanger 5 heatable flue 3 (exit) to make the flue gas temperature who gets into in SCR flue gas denitration device 4 (selective catalytic reduction device) accord with the realization denitration requirement, thereby SCR flue gas denitration device 4 operation of can being convenient for, and then reduce the pollutant that boiler 1 who has the fused salt heating flue gas discharged.
Therefore, according to the utility model discloses boiler 1 with fused salt heating flue gas has the advantage of the SCR flue gas denitration device 4 operation of being convenient for reduce pollutant discharge.
The utility model also provides a power generation system 100, combine below according to the utility model discloses a boiler 1 that has fused salt heating flue gas of embodiment specifically explains according to the utility model discloses power generation system 100 of embodiment.
As shown in fig. 1, a power generation system 100 according to an embodiment of the present invention includes a boiler 1 having molten salt heating flue gas, a steam turbine generator set 20, a high plant transformer 21, and a transformer 22 according to an embodiment of the present invention.
The steam outlet of the boiler 1 with the fused salt heating flue gas is communicated with the inlet of the steam turbine generator set 20. Specifically, the steam turbine-generator set 20 includes a steam turbine 18 and a generator set 19, and a steam outlet of the boiler 1 with molten salt heated flue gas is communicated with an inlet of the steam turbine 18 through a steam pipeline 2 so as to drive the steam turbine 18 to rotate, thereby driving at least part of the generator set 19 to rotate and generating electricity. The steam turbine generator set 20 is connected to the power grid 23 such that at least a portion of the electricity generated by the steam turbine generator set 20 is sent to the power grid 23.
As shown in FIG. 1, the boiler 1 with molten salt heating flue gas according to the embodiment of the present invention comprises a boiler body, an SCR flue gas denitration device 4 and a flue gas heating device.
The boiler body is provided with a flue 3, and an inlet of the SCR flue gas denitration device 4 is communicated with an outlet of the flue 3. Therefore, the SCR flue gas denitration device 4 can be used for denitration of flue gas.
The flue gas heating device comprises a heat exchanger 5, a high-temperature molten salt tank 6, a low-temperature molten salt tank 7, a first pipeline 8, a second pipeline 9, a third pipeline 10 and a first heater 11.
The heat exchanger 5 is located within the flue 3 adjacent the outlet of the flue 3, so that the heat exchanger 5 is used to heat the flue gas at the outlet within the flue 3. Therefore, when the temperature of the flue gas at the outlet of the flue 3 is lower, the heat exchanger 5 can heat the flue gas at the outlet in the flue 3 so as to meet the denitration requirement. The heat exchanger 5 is used for heating the flue gas at the inner outlet of the flue 3, so that the temperature of the flue gas entering the CR flue gas denitration device 4 can be conveniently controlled.
The high-temperature molten salt tank 6 and the low-temperature molten salt tank 7 are used for storing molten salt, and the temperature of the high-temperature molten salt in the high-temperature molten salt tank 6 is higher than that of the low-temperature molten salt in the low-temperature molten salt tank 7.
The outlet of the high-temperature molten salt tank 6 is communicated with the inlet of the heat exchanger 5 through a first pipeline 8. The outlet of the heat exchanger 5 is communicated with the inlet of the low-temperature molten salt tank 7 through a second pipeline 9. The outlet of the low-temperature molten salt tank 7 is communicated with the inlet of the high-temperature molten salt tank 6 through a third pipeline 10. The first heater 11 is disposed on the third pipeline 10, and the first heater 11 is used for heating the molten salt in the third pipeline 10. Therefore, high-temperature molten salt in the high-temperature molten salt tank 6 can enter the heat exchanger 5 through the first pipeline 8 and exchange heat with low-temperature flue gas (the temperature is less than 300 ℃) in the flue 3, so that the low-temperature flue gas in the flue 3 can be heated. The fused salt after heat exchange can enter the low-temperature fused salt tank 7 through the second pipeline 9, the low-temperature fused salt in the low-temperature fused salt tank 7 can enter the third pipeline 10, and the low-temperature fused salt in the low-temperature fused salt tank 7 is heated by the first heater 11 to become high-temperature fused salt and then enters the high-temperature fused salt tank 6. The high-temperature molten salt in the high-temperature molten salt tank 6 can enter the heat exchanger 5 again through the first pipeline 8, so that a heat exchange cycle is formed.
As shown in fig. 1, the steam turbine generator set 20, the high plant transformer 21 and the transformer 22 are connected in sequence, and the high plant transformer 21 is a transformer for supplying power for the plant connected to the generator outlet of the steam turbine generator set 20. The transformer 22 is connected to the high plant transformer 21 to facilitate power supply to the plant equipment.
In some embodiments, the first heater 11 is an electric heater, and the first heater 11 is connected to the transformer 22, so that the power generated by the steam turbine generator set 20 can power the SCR flue gas denitration device 4 of the boiler 1 with molten salt heated flue gas.
As shown in FIG. 1, in some embodiments, the flue gas heating device further comprises a flow control valve 12, a first temperature detector 13, a second temperature detector 14, a controller 15, a first pump body 16, and a second pump body 17.
A flow control valve 12 is arranged on the first line 8, the flow cross section of the flow control valve 12 being variable. Therefore, the flow rate of the high-temperature molten salt entering the heat exchanger 5 can be changed by changing the through-flow section of the flow control valve 12, and the heating quantity of the flue gas in the flue 3 is further changed. For example, when the temperature of the flue gas in the flue 3 is low, the through-flow section of the flow control valve 12 can be increased, so that the flue gas can be conveniently heated; when the flue gas temperature in the flue 3 meets the denitration requirement, the through-flow section of the flow control valve 12 can be reduced or the flow control valve 12 can be closed, so that the waste of energy sources is reduced.
At least part (temperature measuring end) of the first temperature detector 13 and at least part (temperature measuring end) of the second temperature detector 14 are both positioned in the flue 3, and the heat exchanger 5 is positioned between at least part (temperature measuring end) of the first temperature detector 13 and at least part (temperature measuring end) of the second temperature detector 14 in the flow direction of flue gas in the flue 3. Specifically, at least a part (a temperature measuring tip) of the first temperature detector 13 is located upstream of the heat exchanger 5 and at least a part (a temperature measuring tip) of the second temperature detector 14 is located downstream of the heat exchanger 5 in the flow direction of the flue gas, and the flue gas moves in the upstream and downstream directions and is heated by the heat exchanger 5 in the process. So that at least part of the first temperature detector 13 (the temperature measuring tip) can detect the temperature of the unheated flue gas in the flue 3, and at least part of the second temperature detector 14 (the temperature measuring tip) can detect the temperature of the flue gas in the flue 3 heated by the heat exchanger 5. The flow control valve 12 can be adjusted based on the temperature of the unheated flue gas detected by the first temperature detector 13 and the temperature of the flue gas heated by the heat exchanger 5 detected by the second temperature detector 14. For example, when the temperature of the unheated flue gas detected by the first temperature detector 13 meets the denitration requirement, the flow control valve 12 may be closed; when the temperature of the unheated flue gas detected by the first temperature detector 13 is lower than the denitration requirement, the flow control valve 12 can be opened; when the second temperature detector 14 detects that the temperature of the flue gas heated by the heat exchanger 5 is lower than the denitration requirement, the through-flow section of the flow control valve 12 can be increased; when the second temperature detector 14 detects that the temperature of the flue gas heated by the heat exchanger 5 is high, the through-flow cross section of the flow control valve 12 can be reduced.
The controller 15 is electrically connected with the first temperature detector 13, the second temperature detector 14 and the flow control valve 12, and the controller 15 can be used for controlling the size of the through-flow section of the flow control valve 12. Specifically, the controller 15 may receive temperature measurement information of the first temperature detector 13 and the second temperature detector 14, and the controller 15 adjusts the size of the flow cross section of the flow control valve 12 according to the received temperature measurement information of the first temperature detector 13 and the second temperature detector 14. Thereby being convenient for heat the flue gas and can improving flue gas heating device's degree of automation to reduce the human cost. For example, the controller 15 is a single chip.
A first pump body 16 is provided on the first conduit 8, the first pump body 16 being located between the flow control valve 12 and the inlet of the first conduit 8. A second pump body 17 is arranged on the third duct 10, the second pump body 17 being located between the inlet of the third duct 10 and the first heater 11. The first pump 16 and the second pump 17 facilitate the flow of the molten salt inside the flue gas heating device.
In some embodiments, the heat exchanger 5 is a second heater, which is an electric heater, and the second heater is connected to the transformer 22. So that the electric power generated by the steam turbine generator set 20 can supply energy to the SCR flue gas denitration device 4 of the boiler 1 with the molten salt heating flue gas.
When the power generation load of the steam turbine generator set 20 can be slightly higher than the required load of the power grid 23, the excess part supplies power to the first heater 11 through the high plant transformer 21 and the transformer 22; meanwhile, the second pump body 17 is started to drive the low-temperature molten salt to enter the first heater 11 to absorb heat, the liquid level of the low-temperature molten salt tank 7 is gradually reduced in the process, the liquid level of the high-temperature molten salt tank 6 is gradually increased, and the heat absorption process is completed.
When the power grid 23 sends out and needs the steam turbine generating set 20 to carry out the degree of depth peak regulation to lower load, first pump body 16 starts when the temperature that first thermoscope 13 and second thermoscope 14 measure is less than the minimum temperature of SCR flue gas denitration device 4 normal operating, drive high temperature fused salt and get into heat exchanger 5 release heat, thereby improve the flue gas temperature who gets into SCR flue gas denitration device 4, in order to reach the required flue gas temperature of SCR flue gas denitration device 4 normal operating, then come the flow of accurate control high temperature fused salt through flow control valve 12, in order to guarantee the stability of SCR flue gas denitration device 4 entrance flue gas temperature, the liquid level of high temperature fused salt jar 6 reduces gradually in this process, the liquid level of low temperature fused salt jar 7 risees gradually, accomplish exothermic process.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean 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 disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations to the above embodiments by those of ordinary skill in the art are intended to be within the scope of the present invention.
Claims (10)
1. A boiler with molten salt heating flue gas, characterized by comprising:
a boiler body having a flue;
the inlet of the SCR flue gas denitration device is communicated with the outlet of the flue;
the flue gas heating device comprises a heat exchanger, the heat exchanger is located in the flue, and the heat exchanger is used for heating flue gas in the flue.
2. The boiler with molten salt heating flue gas of claim 1, characterized in that the flue gas heating device further comprises
The high-temperature molten salt tank and the low-temperature molten salt tank are both used for storing molten salt;
the outlet of the high-temperature molten salt tank is communicated with the inlet of the heat exchanger through the first pipeline;
the outlet of the heat exchanger is communicated with the inlet of the low-temperature molten salt tank through a second pipeline;
the outlet of the low-temperature molten salt tank is communicated with the inlet of the high-temperature molten salt tank through a third pipeline;
the first heater is arranged on the third pipeline and used for heating the molten salt in the third pipeline.
3. The boiler with molten salt heating flue gas of claim 2, further comprising a flow control valve provided on the first pipeline, the flow cross section of the flow control valve being variable.
4. The boiler with molten salt heated flue gas of claim 3, wherein the flue gas heating apparatus further comprises a first temperature probe and a second temperature probe, at least a portion of the first temperature probe and at least a portion of the second temperature probe both being located within the flue, the heat exchanger being located between at least a portion of the first temperature probe and at least a portion of the second temperature probe in a flue gas flow direction within the flue.
5. The boiler with molten salt heating flue gas of claim 4, further comprising a controller electrically connected to the first temperature detector, the second temperature detector and the flow control valve, the controller operable to control a size of a flow cross section of the flow control valve.
6. The boiler with molten salt heating flue gas of claim 3, characterized in that the flue gas heating device further comprises
The first pump body is arranged on the first pipeline and is positioned between the flow control valve and an inlet of the first pipeline;
and the second pump body is arranged on the third pipeline and is positioned between an inlet of the third pipeline and the first heater.
7. The boiler with molten salt heated flue gas of claim 1, wherein the heat exchanger is located within the flue and adjacent to an outlet of the flue.
8. A power generation system, comprising
A boiler, which is the boiler with molten salt heating flue gas of any one of claims 1-7;
and the steam outlet of the boiler is communicated with the inlet of the steam turbine generator set, and the steam turbine generator set is connected with a power grid.
9. The power generation system of claim 8, comprising a high plant transformer and a transformer, wherein the steam turbine generator set, the high plant transformer and the transformer are connected in sequence, and wherein the boiler comprises a first heater, wherein the first heater is an electric heater, and the first heater is connected with the transformer.
10. The power generation system of claim 8, comprising a high plant transformer and a transformer, wherein the steam turbine generator set, the high plant transformer and the transformer are connected in sequence, and wherein the boiler comprises a heat exchanger, wherein the heat exchanger is a second heater, the second heater is an electric heater, and the second heater is connected with the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221461291.0U CN218295694U (en) | 2022-06-10 | 2022-06-10 | Boiler and power generation system with fused salt heating flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221461291.0U CN218295694U (en) | 2022-06-10 | 2022-06-10 | Boiler and power generation system with fused salt heating flue gas |
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| Publication Number | Publication Date |
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| CN218295694U true CN218295694U (en) | 2023-01-13 |
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| CN202221461291.0U Active CN218295694U (en) | 2022-06-10 | 2022-06-10 | Boiler and power generation system with fused salt heating flue gas |
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- 2022-06-10 CN CN202221461291.0U patent/CN218295694U/en active Active
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