CN215808601U

CN215808601U - Baffle device and waste heat recovery system

Info

Publication number: CN215808601U
Application number: CN202122317515.2U
Authority: CN
Inventors: 王文奇; 张哲源; 闫进京; 赵燊棵; 杨铭; 黄书广
Original assignee: Luoyang Ruichang Environmental Engineering Co ltd
Current assignee: Luoyang Ruichang Environmental Engineering Co ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2022-02-11
Anticipated expiration: 2031-09-24

Abstract

The utility model provides a baffle device and a waste heat recovery system, wherein the baffle device comprises a starting execution mechanism, a flange and a valve body, a valve plate is arranged in the valve body, and the starting execution mechanism is connected with a central rotating shaft of the valve plate; at least one side of the valve body is provided with a flange and is connected with an external pipeline through the flange, a detachable sealing plate is arranged in the flange, and the sealing plate can completely block the flow of a medium in the baffle device; according to the utility model, the flow of the medium is completely blocked under the combined action of the valve body structure and the sealing plate, so that the sealing performance of the baffle plate device is improved, on one hand, the stable operation of the system is favorably ensured, the normal switching between corresponding devices is ensured, on the other hand, the medium leakage is avoided, and the safety risk is favorably reduced.

Description

Baffle device and waste heat recovery system

Technical Field

The utility model relates to the technical field of flue gas treatment, in particular to a baffle device and a waste heat recovery system.

Background

In the existing waste heat recovery system, a damper is often required to be additionally installed to cut off, open or adjust the flow of gas (flue gas or air, and the like, the same below), or to switch gas when a plurality of identical devices operate, so as to realize one-use one-standby, multiple-use multiple-standby and the like.

However, the sealing performance of flapper doors has been a technical challenge to the skilled artisan in their practical application. The sealing of a common baffle door is usually realized by contacting the peripheral edge of a door leaf with a limiting plate welded on a door frame to form a sealing surface, but because the door frame and the door leaf are welded parts, certain gaps still exist on the contact surface between the peripheral edge of the door leaf and the limiting plate, so that the sealing performance of the conventional baffle door is poor.

In addition, in the pipeline of the waste heat recovery system, the flue gas temperature is higher, the flue gas composition is complicated, and even a certain amount of toxic gas components exist, so that the normal operation condition of the waste heat recovery system can be influenced and certain potential safety hazards can be caused due to leakage caused by poor sealing performance of the baffle device. Therefore, under the operation condition of the waste heat recovery system, how to sufficiently improve the sealing performance of the baffle door under the appropriate economic and technical conditions becomes a research direction of the technicians in the field.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a baffle device and a waste heat recovery system to solve the problem of poor sealing performance of the baffle device in the prior art.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

a baffle plate device comprises a starting execution mechanism, a flange and a valve body, wherein a valve plate is arranged in the valve body, and the starting execution mechanism is connected with a central rotating shaft of the valve plate; at least one side of the valve body is provided with a flange and is connected with an external pipeline through the flange, a detachable sealing plate is arranged in the flange, and the sealing plate can completely block the flow of a medium in the baffle device.

Furthermore, the sealing plate comprises a main plate body, and the flow-stopping area of the main plate body is larger than or equal to the sectional area of the medium channel in the flange.

Furthermore, the outer edge of the main plate body is provided with a fixing plate, and the fixing plate is detachably connected with the flange.

A waste heat recovery system comprises the baffle device.

Furthermore, the waste heat recovery system comprises an air pipeline structure and a flue gas pipeline structure, and the air pipeline structure and the flue gas pipeline structure are respectively communicated with the air preheater.

Furthermore, the air pipeline structure comprises a first fan, a cold air pipeline, an air preheater, a hot air pipeline and a hot air duct which are sequentially communicated. The air pipeline structure comprises a cold air bypass, wherein an inlet of the cold air bypass is communicated with a cold air pipeline, an outlet of the cold air bypass is communicated with a hot air pipeline, and the cold air bypass is provided with a baffle device.

Furthermore, the hot air duct is communicated with an air inlet of the burner, and a baffle device is arranged between the air inlet of the burner and the hot air duct.

Further, the flue gas pipeline structure comprises a high-temperature flue gas pipeline, an air preheater, a low-temperature flue gas pipeline, a second fan and a chimney which are sequentially communicated; a flue gas bypass is arranged in the flue gas pipeline structure, an inlet of the flue gas bypass is communicated with a high-temperature flue gas pipeline, an outlet of the flue gas bypass is communicated with a chimney, and the flue gas bypass is provided with a baffle device.

Further, the waste heat recovery system comprises a high-temperature flue gas pipeline, a third fan, a waste heat boiler, a low-temperature flue gas pipeline and a chimney which are sequentially communicated; the low-temperature flue gas pipeline is provided with a baffle device.

Compared with the prior art, the baffle device and the waste heat recovery system have the following advantages:

according to the baffle device and the waste heat recovery system, the valve body and the valve plate structure are used as the first-stage seal, the detachable sealing plate is arranged in the flange of the baffle device and used as the second-stage seal, when related media need to be plugged, the valve body can be closed, and the sealing plate is installed in the flange, so that the baffle device can be used for completely plugging the flow of the media under the combined action of the first-stage seal structure and the second-stage seal structure, the sealing performance of the baffle device is improved, on one hand, stable operation of the system is guaranteed, normal switching between corresponding devices is guaranteed, on the other hand, medium leakage is avoided, and safety risks are reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is a front view (with a smoke direction as a reference view) of a baffle device according to an embodiment of the present invention;

FIG. 2 is a side view of a baffle assembly according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a sealing plate of a baffle assembly according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a waste heat recovery system according to an embodiment of the present invention;

FIG. 5 is an enlarged view of the structure of the embodiment of the present invention at E in FIG. 4;

fig. 6 is a schematic structural diagram of another waste heat recovery system at a waste heat boiler according to an embodiment of the present invention.

Description of reference numerals:

1. starting an actuating mechanism; 2. a flange; 3. a sealing plate; 31. a main board body; 32. a fixing plate; 4. a seal ring; 5. a fastener; 6. a valve body; 7. a valve plate; 8. a fuel passage; 9. an ignition gun; 10. a combustion chamber; 11. a first fan; 12. a cold air line; 13. an air preheater; 13', a waste heat boiler; 14. a hot air line; 15. a cold air bypass; 16. a hot air duct; 17. heating furnace; 18. a high temperature flue gas line; 19. a low temperature flue gas line; 20. a second fan; 21. a flue gas bypass; 22. a chimney; 23. and a third fan.

Detailed Description

The inventive concepts of the present disclosure will be described hereinafter using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. These utility concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. Meanwhile, in order to facilitate the flow of flue gas and air to be distinguished in the waste heat recovery system, the full-triangle arrows in fig. 4 and fig. 6 are air flow directions, and the half-triangle arrows are flue gas flow directions. Similarly, the high temperature and the low temperature in the present application do not refer to absolute temperatures, but refer to a relative temperature, for example, the flue gas may be referred to as high-temperature flue gas before heat exchange, and referred to as low-temperature flue gas after heat exchange and cooling, which also refers to the relative temperature change of the flue gas before and after heat exchange.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In the existing waste heat recovery system, a damper is often required to be additionally installed to cut off, open or adjust the flow of gas (flue gas or air, and the like, the same below), or to switch gas when a plurality of identical devices operate. The existing baffle plate device has poor sealing performance, gas leakage is easily caused, stable operation of a waste heat recovery system can be influenced, and if a certain amount of toxic gas is contained in flue gas, certain potential safety hazards can exist in flue gas leakage.

In order to solve the problem of poor sealing performance of the baffle device in the prior art, the present embodiment provides a baffle device, as shown in fig. 1 to 3, the baffle device includes a start actuator 1, a flange 2, and a valve body 6, a valve plate 7 is disposed in the valve body 6, and the start actuator 1 is connected to a central rotating shaft of the valve plate 7, and is configured to control a rotation angle of the valve plate 7 in the valve body 6, so as to control an opening degree of the valve body 6. By taking the flowing direction of media (such as air, flue gas and the like) in the valve body 6 as a reference, at least one side of the valve body 6 is provided with a flange 2 and is connected with an external pipeline through the flange 2, a detachable sealing plate 3 is arranged in the flange 2, and the sealing plate 3 can completely block the flowing of the media in the baffle device, so that the baffle device has good sealing performance.

For actuating the actuator 1, a manual speed reducer or a pneumatic actuator may be used to regulate the opening of the valve body 6.

Taking fig. 2 as an example, the angle of the valve plate 7 in the figure makes the valve plate 7 contact with the limit plate in the valve body 6, that is, the valve body 6 is in a closed state, which can be regarded as the closed state of a conventional butterfly valve, and can be used as the first-stage sealing structure of the present application; under this state, this application is through setting up the closing plate 3 that can the dismouting in baffle device's flange 2, as the second level seal structure of this application, when needs carry out the shutoff to relevant medium, can be closed valve body 6, then install closing plate 3 in flange 2, thereby the baffle device of this application is simultaneously through first level seal structure, the combined action of second level seal structure, carry out complete shutoff to the flow of medium, the sealing performance of baffle device has been improved, be favorable to the even running of support system on the one hand, ensure normal switching between corresponding equipment, medium leakage has been avoided on the other hand, be favorable to reducing the safety risk.

For the assembly between the flange 2 and the sealing plate 3, the sealing plate 3 is of a plate-shaped structure and comprises a main plate body 31, and the interception area of the main plate body 31 is larger than or equal to the sectional area of a medium channel in the flange 2, so that the sealing plate 3 can intercept the flow of a medium to realize complete plugging; the shape of the plate body of the sealing plate 3 may be similar to the cross-sectional shape of the medium passage in the flange 2, or may be other shapes as long as it is ensured that the shut-off area of the main plate body 31 in the flange 2 is not less than the cross-sectional area of the medium passage in the flange 2.

The main plate body 31 is provided at an outer edge thereof with a fixing plate 32, and the fixing plate 32 is detachably connected to the flange 2. For example: the fixing plate 32 is provided with a fixing hole through which the fastening member 5 is inserted to fix the sealing plate 3 to the flange 2. Therefore, the simple and convenient dismounting structure of the sealing plate 3 is not only convenient for dismounting operation, but also has a simple whole structure of the sealing plate 3, and is beneficial to reducing the cost.

When not needing to carry out the shutoff, can demolish sealing plate 3 in flange 2, after demolising sealing plate 3, set up the sealing ring 4 that can the dismouting in flange 2 to form the ring seal in flange 2 department, avoid the medium to leak. Preferably, the seal plate 3 and the seal ring 4 are provided at the same position in the flange 2, and when plugging is necessary, the seal plate 3 is attached to the flange 2, and when plugging is unnecessary, only the seal ring 4 is attached to the flange 2.

After the baffle device is improved, according to actual production requirements and different installation requirements of the baffle device in the waste heat recovery system, as shown in fig. 4 to 6, the application provides a waste heat recovery system, which comprises the baffle device. Correspondingly, for the waste heat recovery system, two heat recovery modes, namely air preheater heat exchange and waste heat boiler heat exchange, are usually provided, and the following description is respectively provided.

The waste heat recovery system comprises an air pipeline structure and a flue gas pipeline structure, the air pipeline structure and the flue gas pipeline structure are respectively communicated with an air preheater, and high-temperature flue gas and low-temperature air are subjected to heat exchange through the air preheater to achieve waste heat recovery.

As shown in fig. 4, heat exchange is performed by an air preheater, and the air pipeline structure includes a first fan 11, a cold air pipeline 12, an air preheater 13, a hot air pipeline 14, and a hot air duct 16, which are sequentially connected, that is, external air enters the cold air pipeline 12 through the first fan 11, and after heat exchange and temperature rise are performed by the air preheater 13, the external air sequentially flows through the hot air pipeline 14 and the hot air duct 16.

In addition, in consideration of the fact that the air preheater 13 may have maintenance and the like, which affects the air supply to downstream equipment, a cold air bypass 15 is provided in the air pipeline structure, the inlet of the cold air bypass 15 is communicated with the cold air pipeline 12, and the outlet of the cold air bypass 15 is communicated with the hot air pipeline 14; so that air can be supplied to downstream equipment through the cold air bypass 15 when the air preheater 13 is serviced. Accordingly, in the present application, the cold air bypass 15 is provided with a baffle device (as shown in fig. 4 at a), and when air needs to be supplied to downstream equipment through the cold air bypass 15, the sealing plate 3 is removed from the baffle device, and the opening degree of the valve body 6 is adjusted; if the air preheater 13 is overhauled and normally operated, the normally closed baffle device is arranged, so that the cold air bypass 15 can be effectively ensured not to leak extra air to downstream equipment, and the stable operation of the downstream equipment and even the whole system can be ensured.

The hot air duct 16 is communicated with the burner, preheated air is introduced into the burner, the burner is communicated with the heating furnace 17, heat generated by combustion is supplied to the heating furnace 17, and a flue gas outlet of the heating furnace 17 is communicated with a flue gas pipeline structure and used for discharging flue gas.

For the arrangement of the burner, as shown in fig. 5, the burner includes a fuel channel 8, an ignition gun 9, a combustion chamber 10 and an air inlet, wherein the related structures and arrangement conditions of the fuel channel 8, the ignition gun 9 and the combustion chamber 10 may adopt the existing burner scheme, and are not described in detail. The present application focuses on improving the communication between the burner and the hot air duct 16.

In the bottom of a conventional gas (oil) heating furnace, several or more burners are often installed, and on this basis, the hot air duct 16 is an annular duct, and for any one burner, the air inlet of the burner is communicated with the hot air duct 16, and a baffle device (as shown at B in fig. 5) is arranged between the air inlet of the burner and the hot air duct 16. The stove bottom combustor is all opened when heating furnace 17 is started, the air intake is guaranteed by the baffle device control regulation amount of wind that the combustor reaches best effect, operation along with waste heat recovery system is stable, certain quantity often need be closed to the combustor, thereby this application all sets up baffle device through the air inlet at every combustor, not only be convenient for adjust the operation condition to each combustor, and when closing individual combustor, can ensure to carry out complete shutoff to its air inlet, reach zero sealed effect, avoid in the air leakage to furnace that does not burn, cause heating furnace 17 to operate unstably.

The flue gas pipeline structure comprises a high-temperature flue gas pipeline 18, an air preheater 13, a low-temperature flue gas pipeline 19, a second fan 20 and a chimney 22 which are communicated in sequence. Namely, the flue gas enters the high-temperature flue gas pipeline 18 from the heating furnace 17, and after heat exchange and temperature reduction are carried out by the air preheater 13, the flue gas flows into the low-temperature flue gas pipeline 19, and the flue gas after heat exchange enters the chimney 22 under the drive of the second fan 20.

In addition, considering that the parts such as the air preheater 13 and the second fan 20 may have the conditions such as maintenance and the like, and the emission of the flue gas is affected, the flue gas bypass 21 is arranged in the flue gas pipeline structure, the inlet of the flue gas bypass 21 is communicated with the high-temperature flue gas pipeline 18, and the outlet of the flue gas bypass 21 is communicated with the chimney 22, so that when the relevant parts are maintained, part of the flue gas can be emitted to the chimney 22 through the flue gas bypass 21.

Correspondingly, in this application, flue gas bypass 21 sets up baffle device (like C department in the attached figure 4) to when parts such as heating furnace 17, air heater 13 overhaul, through valve plate 7 closing baffle device, and install closing plate 3 additional, the baffle device that can ensure C department is in complete shutoff state, is used for blocking harmful gas completely, prevents that the harmful gas refluence in the chimney from getting into to overhaul the space and causing injury to the maintainer and to environmental pollution.

As for the waste heat recovery system mainly based on heat exchange of the waste heat boiler, as shown in fig. 6, the waste heat recovery system includes a high-temperature flue gas pipeline 18, a third fan 23, the waste heat boiler 13', a low-temperature flue gas pipeline 19, and a chimney 22, which are sequentially communicated. The connection between the high-temperature flue gas pipeline 18 and the upstream device and the setting condition of the upstream device are all required to be set according to the corresponding industrial application field, and the prior art in the corresponding field can be adopted, which is not described herein.

For a conventional waste heat boiler, an adjusting type high-temperature flue baffle and a flue water-sealed tank are often designed at a flue gas outlet of the conventional waste heat boiler, and are respectively used for adjusting the flue gas flow when the waste heat boiler operates and realizing zero flue gas sealing when a heating furnace is overhauled. What is different from it is, this application only sets up baffle device (like D department in the figure 6) at low temperature flue gas pipeline 19, and through the valve plate 7 of closing baffle device when exhaust-heat boiler overhauls to install closing plate 3 additional, just can block harmful gas completely, prevent that chimney or bypass flue harmful gas from flowing back and getting into exhaust-heat boiler overhauls the space and cause to maintainer injury and to environmental pollution. When the waste heat boiler normally operates, the sealing plate 3 is removed, and after the sealing ring 4 is installed, the opening degree of the valve body 6 is normally regulated. Correspondingly, the arrangement of a flue water seal tank is omitted, the structure of the waste heat recovery system is simplified, and the investment cost and the operation cost are reduced.

The baffle device can be applied to a waste heat recovery system; meanwhile, in a medium pipeline in the waste heat recovery system, the arrangement condition of the baffle device can be adjusted according to the actual production requirement, and the baffle device is not limited to the four arrangement positions A-D provided by the application.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The baffle device is characterized by comprising a starting execution mechanism (1), a flange (2) and a valve body (6), wherein a valve plate (7) is arranged in the valve body (6), and the starting execution mechanism (1) is connected with a central rotating shaft of the valve plate (7); at least one side of the valve body (6) is provided with a flange (2) and is connected with an external pipeline through the flange (2), a detachable sealing plate (3) is arranged in the flange (2), and the sealing plate (3) can completely block the flow of a medium in the baffle device.

2. A baffle device according to claim 1, characterized in that the sealing plate (3) comprises a main plate body (31), the shut-off area of the main plate body (31) being larger than or equal to the cross-sectional area of the medium passage in the flange (2).

3. A shutter device according to claim 2, characterized in that the main plate (31) is provided at its outer edge with a fixing plate (32), said fixing plate (32) being removably connected to the flange (2).

4. A waste heat recovery system, characterized in that it comprises a baffle device according to any of claims 1-3.

5. The waste heat recovery system of claim 4, wherein the waste heat recovery system comprises an air pipeline structure and a flue gas pipeline structure, and the air pipeline structure and the flue gas pipeline structure are respectively communicated with the air preheater.

6. A waste heat recovery system according to claim 5, characterized in that the air pipeline structure comprises a first fan (11), a cold air pipeline (12), an air preheater (13), a hot air pipeline (14) and a hot air duct (16) which are communicated in sequence.

7. A waste heat recovery system as claimed in claim 6, characterized in that the air line arrangement comprises a cold air bypass (15), the inlet of the cold air bypass (15) communicating with the cold air line (12), the outlet of the cold air bypass (15) communicating with the hot air line (14), the cold air bypass (15) being provided with a baffle device.

8. A waste heat recovery system according to claim 6, characterized in that the hot air duct (16) communicates with the air inlet of the burner, and that a baffle device is arranged between the air inlet of the burner and the hot air duct (16).

9. The waste heat recovery system according to claim 5, wherein the flue gas pipeline structure comprises a high-temperature flue gas pipeline (18), an air preheater (13), a low-temperature flue gas pipeline (19), a second fan (20) and a chimney (22) which are communicated in sequence; set up flue gas bypass (21) among the flue gas pipeline structure, the entry and high temperature flue gas pipeline (18) intercommunication of flue gas bypass (21), the export and chimney (22) intercommunication of flue gas bypass (21), flue gas bypass (21) sets up baffle device.

10. A waste heat recovery system according to claim 4, characterized in that the waste heat recovery system comprises a high temperature flue gas pipeline (18), a third fan (23), a waste heat boiler (13'), a low temperature flue gas pipeline (19) and a chimney (22) which are communicated in sequence; the low-temperature flue gas pipeline (19) is provided with a baffle device.