CN118548736A - Boiler waste heat recovery system - Google Patents
Boiler waste heat recovery system Download PDFInfo
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- CN118548736A CN118548736A CN202410563837.0A CN202410563837A CN118548736A CN 118548736 A CN118548736 A CN 118548736A CN 202410563837 A CN202410563837 A CN 202410563837A CN 118548736 A CN118548736 A CN 118548736A
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- 239000002918 waste heat Substances 0.000 title claims abstract description 74
- 238000011084 recovery Methods 0.000 title claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 380
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 117
- 239000003546 flue gas Substances 0.000 claims abstract description 117
- 239000000779 smoke Substances 0.000 claims abstract description 51
- 230000001502 supplementing effect Effects 0.000 claims description 52
- 230000003020 moisturizing effect Effects 0.000 claims description 6
- 239000002699 waste material Substances 0.000 abstract description 6
- 238000004891 communication Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000010259 detection of temperature stimulus Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The disclosure relates to a boiler waste heat recovery system, which comprises a first heat exchanger, a second heat exchanger, a third heat exchanger, a smoke exhaust pipeline and a temperature sensor. The flue gas inlet of the first heat exchanger is used for being connected with a flue of a boiler, the flue gas outlet of the first heat exchanger is connected with a flue gas pipeline, the water outlet of the first heat exchanger is connected with the water inlet of the second heat exchanger and the first water inlet of the third heat exchanger, and the water outlet of the first heat exchanger can be selectively communicated or cut off with the water inlet of the second heat exchanger and the first water inlet of the third heat exchanger; the water outlet of the second heat exchanger is connected with the water inlet of the first heat exchanger. The first water outlet of the third heat exchanger is connected with the water inlet of the second heat exchanger. The temperature sensor is arranged on the smoke exhaust pipeline and is used for detecting the temperature value of smoke in the smoke exhaust pipeline. The boiler waste heat recovery system can improve the efficiency of flue gas waste heat recovery and utilization and reduce the waste of flue gas heat.
Description
Technical Field
The disclosure relates to the technical field of boiler waste heat recovery, in particular to a boiler waste heat recovery system.
Background
When the boiler operates, a large amount of high-temperature flue gas can be generated, the high-temperature flue gas can carry a large amount of heat, and most of the heat of the flue gas can be absorbed and utilized by the boiler waste heat recovery system.
In the related art, it is generally difficult for a designer of a boiler waste heat recovery system to determine the waste heat amount of the flue gas actually discharged by the boiler system, and only project experience is used for estimating the waste heat amount of the flue gas and designing the boiler waste heat recovery system. In the operation process of the boiler system, the residual heat of the flue gas discharged by the boiler system is not constant, if the residual heat of the flue gas which can be recovered by a boiler residual heat recovery system designed by a designer exceeds the actual residual heat of the flue gas discharged by the boiler system, the flue gas temperature is reduced too much, and finally the flue gas power is insufficient, the flue gas is retained and the flue gas cannot be discharged normally, so that the normal operation of the boiler is affected; if the waste heat of the flue gas which can be recovered by the boiler waste heat recovery system designed by a designer is lower than the actual waste heat of the flue gas discharged by the boiler system, the flue gas temperature will be too high, the flue gas heat is not fully utilized, and the resource waste is caused.
Disclosure of Invention
The purpose of the present disclosure is to provide a boiler waste heat recovery system to solve the technical problems existing in the related art.
In order to achieve the above object, the present disclosure provides a boiler waste heat recovery system, including a first heat exchanger, a second heat exchanger, a third heat exchanger, a smoke exhaust duct, and a temperature sensor;
the flue gas inlet of the first heat exchanger is used for being connected with a boiler flue, the flue gas outlet of the first heat exchanger is connected with the flue gas exhaust pipeline, the water outlet of the first heat exchanger is connected with the water inlet of the second heat exchanger and the first water inlet of the third heat exchanger, and the water outlet of the first heat exchanger can be selectively conducted or cut off with the water inlet of the second heat exchanger and is selectively conducted or cut off with the first water inlet of the third heat exchanger;
the water outlet of the second heat exchanger is connected with the water inlet of the first heat exchanger, the air inlet of the second heat exchanger is used for being communicated with the outside atmosphere, and the air outlet of the second heat exchanger is used for being connected with the air preheater;
The first water outlet of the third heat exchanger is connected with the water inlet of the second heat exchanger, the second water inlet of the third heat exchanger is used for being connected with a water supplementing source, and the second water outlet of the third heat exchanger is used for being connected with an economizer;
The temperature sensor is arranged on the smoke exhaust pipeline and is used for detecting the temperature value of smoke in the smoke exhaust pipeline.
Optionally, the boiler waste heat recovery system further comprises a first switch valve and a second switch valve, wherein the water outlet of the first heat exchanger is connected with the water inlet of the second heat exchanger through the first switch valve, and is connected with the first water inlet of the third heat exchanger through the second switch valve.
Optionally, the boiler waste heat recovery system further comprises a third switch valve, wherein the first water outlet of the third heat exchanger is connected with the water inlet of the second heat exchanger through the third switch valve; or alternatively
The boiler waste heat recovery system further comprises a first one-way valve, and the first water outlet of the third heat exchanger is connected with the water inlet of the second heat exchanger through the first one-way valve.
Optionally, the boiler waste heat recovery system further comprises a controller, and the controller is electrically connected with the temperature sensor;
The controller is used for controlling the water outlet of the first heat exchanger to be communicated with the water inlet of the second heat exchanger when the temperature value of the flue gas detected by the temperature sensor is smaller than a preset temperature value, and the water outlet of the first heat exchanger and the first water inlet of the third heat exchanger are cut off;
The controller is also used for controlling the water outlet of the first heat exchanger to be communicated with the first water inlet of the third heat exchanger when the temperature value of the flue gas detected by the temperature sensor is greater than or equal to a preset temperature value, and the water outlet of the first heat exchanger is cut off from the water inlet of the second heat exchanger.
Optionally, the preset temperature value is 110 ℃ to 160 ℃.
Optionally, the boiler waste heat recovery system further comprises a water supplementing flow path, wherein a water inlet of the water supplementing flow path is used for being connected with the water supplementing source, and a water outlet of the water supplementing flow path is used for being connected with the economizer;
Wherein, the moisturizing source can be selectively switched on or off with the water inlet of moisturizing flow path, and is selectively switched on or off with the second water inlet of third heat exchanger.
Optionally, the boiler waste heat recovery system further comprises a fourth switch valve and a fifth switch valve, wherein the water supplementing source is connected with the water inlet of the water supplementing flow path through the fourth switch valve and is connected with the second water inlet of the third heat exchanger through the fifth switch valve.
Optionally, the boiler waste heat recovery system further comprises a sixth switch valve, and the second water outlet of the third heat exchanger is connected with the economizer through the sixth switch valve; or alternatively
The boiler waste heat recovery system further comprises a second one-way valve, and the second water outlet of the third heat exchanger is connected with the economizer through the second one-way valve.
Optionally, the boiler waste heat recovery system further comprises a controller, and the controller is electrically connected with the temperature sensor;
The controller is used for controlling the water outlet of the first heat exchanger to be communicated with the water inlet of the second heat exchanger when the temperature value of the flue gas detected by the temperature sensor is smaller than a preset temperature value, the water outlet of the first heat exchanger is cut off from the first water inlet of the third heat exchanger, the water supplementing source is communicated with the water inlet of the water supplementing flow path, and the water supplementing source is cut off from the second water inlet of the third heat exchanger;
The controller is further used for controlling the water outlet of the first heat exchanger to be communicated with the first water inlet of the third heat exchanger when the temperature value of the flue gas detected by the temperature sensor is larger than or equal to a preset temperature value, the water outlet of the first heat exchanger is cut off from the water inlet of the second heat exchanger, the water supplementing source is communicated with the second water inlet of the third heat exchanger, and the water supplementing source is cut off from the water inlet of the water supplementing flow path.
Optionally, the boiler waste heat recovery system further comprises a water pump, a flue gas flow sensor and a controller;
the water outlet of the second heat exchanger is connected with the water inlet of the first heat exchanger through the water pump;
the smoke flow sensor is arranged on the smoke exhaust pipeline and is used for detecting the flow value of smoke in the smoke exhaust pipeline;
The water pump and the smoke flow sensor are electrically connected with the controller, so that the controller can control the power of the water pump according to the flow value of smoke detected by the smoke flow sensor.
Through the technical scheme, when the temperature sensor detects that the temperature of the smoke discharged in the smoke exhaust pipeline is higher, namely under the working condition that the available waste heat of the smoke is more, the water outlet of the first heat exchanger and the water inlet of the second heat exchanger can be cut off, and the water outlet of the first heat exchanger and the first water inlet of the third heat exchanger are communicated. The cold water introduced by the first heat exchanger can exchange heat with the flue gas introduced by the boiler flue into the first heat exchanger, the cold water after heat exchange becomes primary heat exchange water, the primary heat exchange water has more heat and can enter the third heat exchanger from the first heat exchanger, heat exchange is carried out between the first heat exchanger and the water replenishing source in the third heat exchanger, the temperature rises to become hot water after water replenishing and heat exchange, and the hot water is discharged from the water outlet of the third heat exchanger and is replenished into the economizer; the primary heat exchange water is changed into secondary heat exchange water after heat exchange, the secondary heat exchange water also has certain heat, can be discharged from the first water outlet of the third heat exchanger and is introduced into the second heat exchanger, heat exchange is carried out between the secondary heat exchange water and the external atmosphere introduced by the second heat exchanger, the external atmosphere with increased temperature after heat exchange can be discharged from the air outlet of the second heat exchanger and is fed into the air preheater, and the secondary heat exchange water is changed into cold water again after heat exchange and is introduced into the first heat exchanger to exchange heat with flue gas again, so that circulation is realized, and the heat of the flue gas under the working condition is continuously utilized. Therefore, through temperature sensor's detection, under the more operating mode of flue gas waste heat, the boiler waste heat recovery system that this disclosure provided can carry out the heat transfer with the moisturizing of economizer and air heater's tonifying qi respectively with the flue gas to retrieve the heat of flue gas as much as possible, promoted flue gas waste heat recovery and utilized efficiency, reduce flue gas thermal waste.
When the temperature sensor detects that the temperature of the flue gas discharged in the flue gas exhaust pipeline is low, namely, under the working condition that the available waste heat of the flue gas is small, the water outlet of the first heat exchanger can be communicated with the water inlet of the second heat exchanger, and the water outlet of the first heat exchanger and the first water inlet of the third heat exchanger are cut off. Therefore, cold water introduced into the first heat exchanger can exchange heat with flue gas introduced into the first heat exchanger through a boiler flue, the cold water after heat exchange becomes primary heat exchange water, and under the working condition, the temperature of the primary heat exchange water is lower than that of the primary heat exchange water under the working condition that more waste heat is available for the flue gas, the primary heat exchange water can be directly introduced into the second heat exchanger through the first heat exchanger, heat exchange is carried out between the first heat exchanger and the external atmosphere introduced into the second heat exchanger, the external atmosphere with the temperature increased after heat exchange can be discharged from an air outlet of the second heat exchanger and fed into the air preheater, and the primary heat exchange water can be changed into cold water again after heat exchange and is introduced into the first heat exchanger to exchange heat with the flue gas again, so that circulation is realized, and the heat of the flue gas under the working condition is continuously utilized. Therefore, through the detection of the temperature sensor, under the working condition of less flue gas waste heat, heat exchange can be carried out between the heat of the flue gas and the air supplementing of the air preheater, so that the heat of the flue gas can be recovered as much as possible under the working condition, and the waste of the heat of the flue gas is reduced.
That is, in the boiler waste heat recovery system provided by the present disclosure, the water outlet of the first heat exchanger is controlled to be communicated with the water inlet of the second heat exchanger or to be communicated with the first water inlet of the third heat exchanger by the temperature of the discharged flue gas detected by the temperature sensor, so that the boiler waste heat recovery system of the present disclosure has at least two different working conditions, and can be flexibly adapted to dynamic changes of the available waste heat of the flue gas.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a flow diagram of a boiler heat recovery system provided in an exemplary embodiment of the present disclosure;
FIG. 2 is a flow diagram of a boiler waste heat recovery system provided in an exemplary embodiment of the present disclosure under a first operating condition, wherein arrows indicate flow directions of media;
FIG. 3 is a flow diagram of a boiler waste heat recovery system provided in an exemplary embodiment of the present disclosure in a second operating condition, wherein arrows indicate the flow direction of the medium.
Description of the reference numerals
1. A first heat exchanger; 2. a second heat exchanger; 3. a third heat exchanger; 4. a smoke exhaust duct; 5. a temperature sensor; 6. a boiler flue; 7. an air preheater; 8. an economizer; 9. a first switching valve; 10. a second switching valve; 11. a third switching valve; 12. a controller; 13. a water supply flow path; 14. supplementing a water source; 15. a fourth switching valve; 16. a fifth switching valve; 17. a sixth switching valve; 18. a water pump; 19. a flue gas flow sensor.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
In this disclosure, unless otherwise indicated, the terms "inner" and "outer" refer to the interior and exterior of the corresponding structural outline, and the use of the terms "first," "second," etc. are used for distinguishing between different components and not for sequential or importance.
As shown in fig. 1-3, the present disclosure provides a boiler waste heat recovery system, including a first heat exchanger 1, a second heat exchanger 2, a third heat exchanger 3, a flue gas duct 4, and a temperature sensor 5. The flue gas inlet of the first heat exchanger 1 is used for being connected with the boiler flue 6, the flue gas outlet of the first heat exchanger 1 is connected with the flue gas exhaust pipeline 4, the water outlet of the first heat exchanger 1 is connected with the water inlet of the second heat exchanger 2 and the first water inlet of the third heat exchanger 3, and the water outlet of the first heat exchanger 1 can be selectively conducted or cut off with the water inlet of the second heat exchanger 2 and is selectively conducted or cut off with the first water inlet of the third heat exchanger 3; the water outlet of the second heat exchanger 2 is connected with the water inlet of the first heat exchanger 1. The air inlet of the second heat exchanger 2 is for communication with the outside atmosphere, and the air outlet of the second heat exchanger 2 is for connection with an air preheater 7. The first water outlet of the third heat exchanger 3 is connected with the water inlet of the second heat exchanger 2, the second water inlet of the third heat exchanger 3 is used for being connected with the water supplementing source 14, and the second water outlet of the third heat exchanger 3 is used for being connected with the economizer 8. The temperature sensor 5 is provided on the smoke exhaust duct 4 and detects a temperature value of smoke in the smoke exhaust duct 4.
Through the above technical solution, when the temperature sensor 5 detects that the temperature of the flue gas discharged in the flue gas exhaust pipe 4 is higher, that is, under the working condition that the available waste heat of the flue gas is more (hereinafter referred to as the first working condition), as shown in fig. 2, the water outlet of the first heat exchanger 1 and the water inlet of the second heat exchanger 2 may be cut off, and the water outlet of the first heat exchanger 1 and the first water inlet of the third heat exchanger 3 may be conducted. Therefore, the cold water introduced into the first heat exchanger 1 can exchange heat with the flue gas introduced into the first heat exchanger 1 from the boiler flue 6, the cold water after heat exchange becomes primary heat exchange water, the primary heat exchange water has more heat and can enter the third heat exchanger 3 from the first heat exchanger 1, and the heat exchange is carried out between the third heat exchanger 3 and the water replenishing from the water replenishing source 14 to the third heat exchanger 3, the temperature rises to become hot water after water replenishing and heat exchange, and the hot water is discharged from the water outlet of the third heat exchanger 3 and is replenished into the economizer 8; the primary heat exchange water is changed into secondary heat exchange water after heat exchange, the secondary heat exchange water also has certain heat, can be discharged from the first water outlet of the third heat exchanger 3 and is introduced into the second heat exchanger 2, heat exchange is carried out between the second heat exchanger 2 and the external atmosphere introduced into the second heat exchanger 2, the external atmosphere with the temperature increased after heat exchange can be discharged from the air outlet of the second heat exchanger 2 and fed into the air preheater 7, and the secondary heat exchange water is changed into cold water again after heat exchange and is introduced into the first heat exchanger 1 to exchange heat with flue gas again, so that circulation is realized, and the heat of the flue gas under the working condition is continuously utilized. Therefore, through the detection of temperature sensor 5, under the more operating mode of flue gas waste heat, the boiler waste heat recovery system that this disclosure provided can carry out the heat transfer with the moisturizing of economizer 8 and the air heater 7's of flue gas respectively to retrieve the heat of flue gas as far as possible, promoted flue gas waste heat recovery and utilized efficiency, reduced flue gas heat's waste.
When the temperature sensor 5 detects that the temperature of the flue gas discharged from the flue gas exhaust pipe 4 is low, that is, the working condition that the available waste heat of the flue gas is small (hereinafter referred to as a second working condition), as shown in fig. 3, the water outlet of the first heat exchanger 1 may be conducted with the water inlet of the second heat exchanger 2, and the water outlet of the first heat exchanger 1 may be blocked from the first water inlet of the third heat exchanger 3. Therefore, cold water introduced into the first heat exchanger 1 can exchange heat with flue gas introduced into the first heat exchanger 1 through the boiler flue 6, the cold water after heat exchange becomes primary heat exchange water, and under the working condition, the temperature of the flue gas is lower, the primary heat exchange water is lower than that of the primary heat exchange water under the first working condition, the primary heat exchange water can be directly introduced into the second heat exchanger 2 through the first heat exchanger 1, heat exchange is carried out between the first heat exchanger 1 and the external atmosphere introduced into the second heat exchanger 2, the external atmosphere with the temperature increased after heat exchange can be discharged from an air outlet of the second heat exchanger 2 and fed into the air preheater 7, and the primary heat exchange water can be changed into cold water again after heat exchange and is introduced into the first heat exchanger 1 to exchange heat with the flue gas again, so that circulation is realized, and the heat of the flue gas under the working condition is continuously utilized. Therefore, through the detection of the temperature sensor 5, under the working condition of less flue gas waste heat, heat exchange can be carried out between the heat of the flue gas and the air supplementing of the air preheater 7, so that the heat of the flue gas can be recovered as much as possible under the working condition, and the waste of the heat of the flue gas is reduced.
That is, in the boiler waste heat recovery system provided by the present disclosure, the water outlet of the first heat exchanger 1 is controlled to be communicated with the water inlet of the second heat exchanger 2 or to be communicated with the first water inlet of the third heat exchanger 3 by the temperature of the discharged flue gas detected by the temperature sensor 5, so that the boiler waste heat recovery system of the present disclosure has at least two different working conditions, and can be flexibly adapted to dynamic changes of the available waste heat of the flue gas.
Here, the above-mentioned economizer 8 is a device for recovering waste heat of discharged smoke installed on a flue of a boiler, and can heat the water fed into the economizer 8 into a heating surface of saturated water at a drum pressure, reducing heat absorption of the water fed into the heating surface of saturated water, and thus, the water fed into the economizer 8 is heated by waste heat of flue gas, energy can be saved, and efficiency can be improved. The air preheater 7 is a device for preheating air before entering the boiler to a certain temperature by flue gas in a flue of the boiler through an internal cooling fin so as to improve the heat exchange performance of the boiler, and therefore, the air supplementing of the air preheater 7 is heated by the waste heat of the flue gas, which is beneficial to improving the heat exchange performance of the boiler.
Alternatively, the water supply source 14 may be a water tank or a water supply pipe in a municipal water supply network, which is not limited in this disclosure.
Optionally, the boiler waste heat recovery system further comprises a first switch valve 9 and a second switch valve 10, wherein the water outlet of the first heat exchanger 1 is connected with the water inlet of the second heat exchanger 2 via the first switch valve 9, and is connected with the first water inlet of the third heat exchanger 3 via the second switch valve 10. By arranging the first switch valve 9 and the second switch valve 10, the connection or disconnection of the water outlet of the first heat exchanger 1 and the water inlet of the second heat exchanger 2 and the connection or disconnection of the water outlet of the first heat exchanger 1 and the first water inlet of the third heat exchanger 3 can be realized according to the flue gas temperature detected by the temperature sensor 5.
In one embodiment provided by the present disclosure, the boiler waste heat recovery system further comprises a third switch valve 11, the first water outlet of the third heat exchanger 3 being connected with the water inlet of the second heat exchanger 2 via the third switch valve 11. By arranging the third switch valve 11, the connection or disconnection of the first water outlet of the third heat exchanger 3 and the water inlet of the second heat exchanger 2 is facilitated, and under the condition that the water outlet of the first heat exchanger 1 is connected with the water inlet of the second heat exchanger 2, the water discharged from the water outlet of the first heat exchanger 1 can be prevented from flowing back into the third heat exchanger 3 by closing the third switch valve 11.
In another embodiment of the present disclosure, the boiler waste heat recovery system further includes a first check valve (not shown in the drawings), and the first water outlet of the third heat exchanger 3 is connected to the water inlet of the second heat exchanger 2 via the first check valve, so that in the case that the water outlet of the first heat exchanger 1 is in communication with the water inlet of the second heat exchanger 2, the first check valve may prevent water discharged from the water outlet of the first heat exchanger 1 from being introduced into the third heat exchanger 3, that is, the first check valve may replace the third switch valve 11 in the above embodiment.
It is understood that the water outlet of the first heat exchanger 1 is manually or automatically controlled to be connected or disconnected with the water inlet of the second heat exchanger 2 or the first water inlet of the third heat exchanger 3 by the temperature detected by the temperature sensor 5, which is not limited in this disclosure. In some embodiments, in order to quickly respond to the temperature detected by the temperature sensor 5 to facilitate control, the boiler waste heat recovery system further includes a controller 12, the controller 12 being electrically connected to the temperature sensor 5. The controller 12 is configured to control the water outlet of the first heat exchanger 1 to be connected with the water inlet of the second heat exchanger 2, and the water outlet of the first heat exchanger 1 to be disconnected with the first water inlet of the third heat exchanger 3 when the temperature value of the flue gas detected by the temperature sensor 5 is less than a preset temperature value; the controller 12 is further configured to control the water outlet of the first heat exchanger 1 to be connected to the first water inlet of the third heat exchanger 3, and the water outlet of the first heat exchanger 1 to be disconnected from the water inlet of the second heat exchanger 2 when the temperature value of the flue gas detected by the temperature sensor 5 is greater than or equal to a preset temperature value.
In the present disclosure, based on the above-described arrangement of the first, second, and third switching valves 9, 10, and 11, as an exemplary embodiment, each of the first, second, and third switching valves 9, 10, and 11 may be an electrically controlled valve, and each of the first, second, and third switching valves 9, 10, and 11 may be electrically connected with the controller 12. That is, when the temperature value of the flue gas detected by the temperature sensor 5 is less than the preset temperature value, the controller 12 can control the first switch valve 9 to be opened, and the second switch valve 10 and the third switch valve 11 are closed, so that the water outlet of the first heat exchanger 1 is communicated with the water inlet of the second heat exchanger 2, and the water outlet of the first heat exchanger 1 is blocked from the first water inlet of the third heat exchanger 3; when the temperature value of the flue gas detected by the temperature sensor 5 is greater than or equal to a preset temperature value, the controller 12 can control the first switch valve 9 to be closed, and the second switch valve 10 and the third switch valve 11 are both opened, so that the water outlet of the first heat exchanger 1 is communicated with the first water inlet of the third heat exchanger 3, and the water outlet of the first heat exchanger 1 is blocked from the water inlet of the second heat exchanger 2.
It should be noted that, when the temperature value of the flue gas detected by the temperature sensor 5 is less than or equal to the minimum temperature value of the waste heat available for flue gas, the controller 12 may control the first switch valve 9, the second switch valve 10, and the third switch valve 11 to be closed, where the minimum temperature value is less than the preset temperature value.
Alternatively, the preset temperature value may be 110 ℃ to 160 ℃.
Optionally, the boiler waste heat recovery system further comprises a water supplementing flow path 13, a water inlet of the water supplementing flow path 13 is used for being connected with a water supplementing source 14, a water outlet of the water supplementing flow path 13 is used for being connected with the economizer 8, and water supplementing to the economizer 8 can be facilitated through the water supplementing flow path 13. Wherein the water supplementing source 14 can be selectively connected or disconnected with the water inlet of the water supplementing flow path 13 and with the second water inlet of the third heat exchanger 3. When the temperature sensor 5 detects that the temperature of the flue gas discharged in the flue gas discharge pipeline 4 is higher, the water supplementing source 14 can be communicated with the second water inlet of the third heat exchanger 3 and cut off from the water inlet of the water supplementing flow path 13, so that the water supplementing source 14 can exchange heat with primary heat exchange water in the third heat exchanger 3 to become hot water to be supplemented into the economizer 8; when the temperature sensor 5 detects that the temperature of the flue gas discharged in the flue gas discharge pipeline 4 is low, the water supplementing source 14 can be cut off from the second water inlet of the third heat exchanger 3 and communicated with the water inlet of the water supplementing flow path 13, so that the water supplementing of the water supplementing source 14 is directly supplemented into the economizer 8.
Optionally, the boiler waste heat recovery system further comprises a fourth switch valve 15 and a fifth switch valve 16, the water make-up source 14 being connected to the water inlet of the water make-up flow path 13 via the fourth switch valve 15 and to the second water inlet of the third heat exchanger 3 via the fifth switch valve 16. By providing the fourth switch valve 15 and the fifth switch valve 16, it is advantageous to realize the on or off of the water supply source 14 and the water inlet of the water supply channel 13 and the on or off of the water supply source 14 and the second water inlet of the third heat exchanger 3 according to the temperature of the flue gas detected by the temperature sensor 5.
Optionally, in one embodiment provided by the present disclosure, the boiler waste heat recovery system further comprises a sixth switch valve 17, the second water outlet of the third heat exchanger 3 being connected to the economizer 8 via the sixth switch valve 17. By arranging the sixth switch valve 17, the connection or disconnection of the second water outlet of the third heat exchanger 3 and the economizer 8 is facilitated. Also, when the water supply source 14 is in communication with the economizer 8, the reverse flow of water in the water supply passage 13 into the third heat exchanger 3 can be avoided by closing the sixth switching valve 17.
In another embodiment provided by the present disclosure, the boiler waste heat recovery system further includes a second check valve, and the second water outlet of the third heat exchanger 3 is connected to the economizer 8 via the second check valve, so that, in the case where the water replenishing source 14 is conducted to the economizer 8 through the water replenishing flow path 13, the second check valve may prevent water in the water replenishing flow path 13 from flowing back into the third heat exchanger 3, that is, the second check valve may replace the sixth switch valve 17 in the above embodiment.
It will be appreciated that whether the water replenishment source 14 is turned on or off with the water inlet of the water replenishment flow path 13 or is turned on or off with the second water inlet of the third heat exchanger 3 is manually or automatically controlled by the temperature detected by the temperature sensor 5, and is not limited in this disclosure. In some embodiments, based on the setting of the controller 12, in order to quickly respond to the temperature detected by the temperature sensor 5 so as to realize control, the controller 12 is configured to control the water outlet of the first heat exchanger 1 to be connected to the water inlet of the second heat exchanger 2, the water outlet of the first heat exchanger 1 to be disconnected from the first water inlet of the third heat exchanger 3, the water supplementing source 14 to be connected to the water inlet of the water supplementing channel 13, and the water supplementing source 14 to be disconnected from the second water inlet of the third heat exchanger 3 when the temperature value of the flue gas detected by the temperature sensor 5 is less than a preset temperature value; the controller 12 is further configured to control, when the temperature value of the flue gas detected by the temperature sensor 5 is greater than or equal to a preset temperature value, the water outlet of the first heat exchanger 1 to be connected to the first water inlet of the third heat exchanger 3, the water outlet of the first heat exchanger 1 to be disconnected from the water inlet of the second heat exchanger 2, and the water supplementing source 14 to be connected to the second water inlet of the third heat exchanger 3, and the water supplementing source 14 to be disconnected from the water inlet of the water supplementing channel 13.
In the present disclosure, based on the above-described settings of the fourth, fifth, and sixth switching valves 15, 16, and 17, and based on the above-described settings of the first, second, and third switching valves 9, 10, and 11, as an exemplary embodiment, each of the first, second, third, fourth, fifth, and sixth switching valves 9, 10, 11, 15, 16, and 17 may be an electrically controlled valve, and each of the first, second, third, fourth, fifth, and sixth switching valves 9, 10, 11, 15, 16, and 17 may be electrically connected with the controller 12.
When the temperature value of the flue gas detected by the temperature sensor 5 is smaller than a preset temperature value, the controller 12 can control the first switch valve 9, the fifth switch valve 16 and the sixth switch valve 17 to be opened, and the second switch valve 10, the third switch valve 11 and the fourth switch valve 15 to be closed, so that the water outlet of the first heat exchanger 1 is communicated with the water inlet of the second heat exchanger 2, the water outlet of the first heat exchanger 1 is blocked with the first water inlet of the third heat exchanger 3, the water supplementing source 14 is communicated with the second water inlet of the third heat exchanger 3, and the water supplementing source 14 is blocked with the water inlet of the water supplementing channel 13; when the temperature value of the flue gas detected by the temperature sensor 5 is greater than or equal to a preset temperature value, the controller 12 can control the first switch valve 9, the fifth switch valve 16 and the sixth switch valve 17 to be closed, and the second switch valve 10, the third switch valve 11 and the fourth switch valve 15 to be opened, so that the water outlet of the first heat exchanger 1 is communicated with the first water inlet of the third heat exchanger 3, the water outlet of the first heat exchanger 1 is blocked with the water inlet of the second heat exchanger 2, the water supplementing source 14 is blocked with the second water inlet of the third heat exchanger 3, and the water supplementing source 14 is communicated with the water inlet of the water supplementing channel 13.
Optionally, the boiler waste heat recovery system further comprises a water pump 18 and a flue gas flow sensor 19; the water outlet of the second heat exchanger 2 is connected with the water inlet of the first heat exchanger 1 through a water pump 18; a smoke flow sensor 19 is provided on the smoke exhaust duct 4 and is used to detect the flow value of smoke in the smoke exhaust duct 4. Based on the setting of the controller 12, the water pump 18 and the smoke flow sensor 19 are electrically connected to the controller 12, so that the controller 12 can control the power of the water pump 18 according to the flow value of the smoke detected by the smoke flow sensor 19. That is, in the present disclosure, the water pump 18 may be a variable frequency water pump 18. So arranged, the flow value of the discharged smoke is detected by the smoke flow sensor 19, and when the smoke flow sensor 19 detects that the smoke flow value is overlarge, namely the heat carried by the smoke is overlarge, the controller 12 can control the power of the water pump 18 to increase so as to increase the flow of cold water fed into the first heat exchanger 1, so that heat exchange is carried out with the smoke as much as possible; when the smoke flow sensor 19 detects that the smoke flow value is smaller, that is, the heat carried by the smoke is smaller, the controller 12 can control the power of the water pump 18 to be reduced so as to reduce the flow of cold water introduced into the first heat exchanger 1, so that the cold water introduced into the first heat exchanger 1 can exchange heat with the smoke to become hot water as much as possible.
In addition, in other embodiments of the present disclosure, the controller 12 is also capable of controlling the power of the water pump 18 based on the temperature value of the flue gas detected by the temperature sensor 5. When the temperature sensor 5 detects that the temperature of the flue gas discharged in the flue gas discharge pipeline 4 is higher, the controller 12 can control the power of the water pump 18 to be increased so as to increase the flow rate of cold water fed into the first heat exchanger 1, so that heat exchange with the flue gas is performed as much as possible; when the temperature sensor 5 detects that the temperature of the flue gas discharged in the flue gas pipe 4 is low, the controller 12 can control the power of the water pump 18 to be reduced so as to reduce the flow of cold water introduced into the first heat exchanger 1, so that the cold water introduced into the first heat exchanger 1 can exchange heat with the flue gas to become hot water as much as possible.
Alternatively, the first switch valve 9, the second switch valve 10, the third switch valve 11, the fourth switch valve 15, the fifth switch valve 16 and the sixth switch valve 17 may be valves with controllable opening degrees, and the valve opening degrees of the first switch valve 9, the second switch valve 10, the third switch valve 11, the fourth switch valve 15, the fifth switch valve 16 and the sixth switch valve 17 may be controlled by the controller 12 according to the temperature value of the flue gas detected by the temperature sensor 5 and the flue gas flow value detected by the flue gas flow sensor 19.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (10)
1. The boiler waste heat recovery system is characterized by comprising a first heat exchanger, a second heat exchanger, a third heat exchanger, a smoke exhaust pipeline and a temperature sensor;
the flue gas inlet of the first heat exchanger is used for being connected with a boiler flue, the flue gas outlet of the first heat exchanger is connected with the flue gas exhaust pipeline, the water outlet of the first heat exchanger is connected with the water inlet of the second heat exchanger and the first water inlet of the third heat exchanger, and the water outlet of the first heat exchanger can be selectively conducted or cut off with the water inlet of the second heat exchanger and is selectively conducted or cut off with the first water inlet of the third heat exchanger;
the water outlet of the second heat exchanger is connected with the water inlet of the first heat exchanger, the air inlet of the second heat exchanger is used for being communicated with the outside atmosphere, and the air outlet of the second heat exchanger is used for being connected with the air preheater;
The first water outlet of the third heat exchanger is connected with the water inlet of the second heat exchanger, the second water inlet of the third heat exchanger is used for being connected with a water supplementing source, and the second water outlet of the third heat exchanger is used for being connected with an economizer;
The temperature sensor is arranged on the smoke exhaust pipeline and is used for detecting the temperature value of smoke in the smoke exhaust pipeline.
2. The boiler waste heat recovery system of claim 1, further comprising a first switch valve and a second switch valve, wherein the water outlet of the first heat exchanger is connected to the water inlet of the second heat exchanger via the first switch valve and to the first water inlet of the third heat exchanger via the second switch valve.
3. The boiler waste heat recovery system of claim 2, further comprising a third switch valve, the first water outlet of the third heat exchanger being connected to the water inlet of the second heat exchanger via the third switch valve; or alternatively
The boiler waste heat recovery system further comprises a first one-way valve, and the first water outlet of the third heat exchanger is connected with the water inlet of the second heat exchanger through the first one-way valve.
4. A boiler waste heat recovery system according to any one of claims 1-3, further comprising a controller electrically connected to the temperature sensor;
The controller is used for controlling the water outlet of the first heat exchanger to be communicated with the water inlet of the second heat exchanger when the temperature value of the flue gas detected by the temperature sensor is smaller than a preset temperature value, and the water outlet of the first heat exchanger and the first water inlet of the third heat exchanger are cut off;
The controller is also used for controlling the water outlet of the first heat exchanger to be communicated with the first water inlet of the third heat exchanger when the temperature value of the flue gas detected by the temperature sensor is greater than or equal to a preset temperature value, and the water outlet of the first heat exchanger is cut off from the water inlet of the second heat exchanger.
5. The boiler waste heat recovery system of claim 4, wherein the preset temperature value is 110 ℃ to 160 ℃.
6. The boiler waste heat recovery system of claim 1, further comprising a make-up water flow path having a water inlet for connection to the make-up water source and a water outlet for connection to the economizer;
Wherein, the moisturizing source can be selectively switched on or off with the water inlet of moisturizing flow path, and is selectively switched on or off with the second water inlet of third heat exchanger.
7. The boiler waste heat recovery system according to claim 6, further comprising a fourth switch valve and a fifth switch valve, wherein the make-up water source is connected to the water inlet of the make-up water flow path via the fourth switch valve and to the second water inlet of the third heat exchanger via the fifth switch valve.
8. The boiler waste heat recovery system of claim 7, further comprising a sixth on-off valve, the second water outlet of the third heat exchanger being connected to the economizer via the sixth on-off valve; or alternatively
The boiler waste heat recovery system further comprises a second one-way valve, and the second water outlet of the third heat exchanger is connected with the economizer through the second one-way valve.
9. The boiler waste heat recovery system of any one of claims 6-8, further comprising a controller electrically connected to the temperature sensor;
The controller is used for controlling the water outlet of the first heat exchanger to be communicated with the water inlet of the second heat exchanger when the temperature value of the flue gas detected by the temperature sensor is smaller than a preset temperature value, the water outlet of the first heat exchanger is cut off from the first water inlet of the third heat exchanger, the water supplementing source is communicated with the water inlet of the water supplementing flow path, and the water supplementing source is cut off from the second water inlet of the third heat exchanger;
The controller is further used for controlling the water outlet of the first heat exchanger to be communicated with the first water inlet of the third heat exchanger when the temperature value of the flue gas detected by the temperature sensor is larger than or equal to a preset temperature value, the water outlet of the first heat exchanger is cut off from the water inlet of the second heat exchanger, the water supplementing source is communicated with the second water inlet of the third heat exchanger, and the water supplementing source is cut off from the water inlet of the water supplementing flow path.
10. The boiler waste heat recovery system of any one of claims 1-3 or 6-8, further comprising a water pump, a flue gas flow sensor, and a controller;
the water outlet of the second heat exchanger is connected with the water inlet of the first heat exchanger through the water pump;
the smoke flow sensor is arranged on the smoke exhaust pipeline and is used for detecting the flow value of smoke in the smoke exhaust pipeline;
The water pump and the smoke flow sensor are electrically connected with the controller, so that the controller can control the power of the water pump according to the flow value of smoke detected by the smoke flow sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410563837.0A CN118548736A (en) | 2024-05-08 | 2024-05-08 | Boiler waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410563837.0A CN118548736A (en) | 2024-05-08 | 2024-05-08 | Boiler waste heat recovery system |
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| CN118548736A true CN118548736A (en) | 2024-08-27 |
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| CN202410563837.0A Pending CN118548736A (en) | 2024-05-08 | 2024-05-08 | Boiler waste heat recovery system |
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| Country | Link |
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| CN (1) | CN118548736A (en) |
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- 2024-05-08 CN CN202410563837.0A patent/CN118548736A/en active Pending
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