Damper door not prone to dust accumulation
By designing a purging component and an intermittent purging mechanism on the damper of the boiler bypass flue, the problems of difficulty in opening and closing the damper due to ash accumulation and reduction of the flue flow area were solved, thus achieving stable operation and efficient cleaning of the equipment.
Patent Information
- Application Number
- CN202511147144.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-15
- Publication Date
- 2025-11-18
AI Technical Summary
The dampers of the existing boiler bypass flue are severely ash-accumulated, which prevents them from opening and closing properly and reduces the flow area of the flue, affecting equipment operation.
Design a baffle door that is not prone to dust accumulation, equipped with a purging assembly including nozzles and air pipes, to remove dust accumulation on both sides of the door panel. Combined with a solenoid valve, intermittent purging is achieved to avoid difficulties in opening and closing and reduction of flue flow area caused by dust accumulation.
It effectively removes accumulated ash, prevents the damper door from failing to open and close properly, maintains the flow area of the flue, reduces equipment wear, and improves the reliability and efficiency of equipment operation.
Smart Images
Figure CN120969862A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of thermal power generating unit equipment, in particular to a baffle door not prone to dust accumulation. BACKGROUND
[0002] Deep peak regulation of thermal power generating units has become the norm. When the boiler is running at low load, the flue gas temperature is low, which causes the denitration system catalyst to be unable to operate normally, and therefore wide load denitration modification is required. Flue gas bypass is a widely used technical route, which is widely used due to its good temperature rise effect, low investment cost and other advantages. However, the currently operated bypass flue generally has a serious problem of dust accumulation in front of and behind the baffle door at the horizontal position, which causes the baffle door to be unable to normally open and close. In addition, dust accumulation also causes the flow area of the bypass flue to decrease and the flue gas flow rate to increase, which aggravates the wear of equipment components, and after a long time of operation, the high-temperature flue gas flow effect of the bypass flue is affected. SUMMARY
[0003] The embodiments of the present application at least provide a baffle door not prone to dust accumulation, which can realize purging and removing dust accumulation on both sides of the door plate, and prevent problems such as the door plate being unable to normally open and close and the flow area of the flue decreasing due to dust accumulation.
[0004] The embodiments of the present application provide a baffle door not prone to dust accumulation, which is suitable for being used in a horizontal flue of a boiler bypass flue to open and close the boiler bypass flue, and comprises:
[0005] A door frame, which is arranged in the horizontal flue;
[0006] A door plate, which is arranged in the door frame and can rotate relative to the door frame to open and close the bypass flue;
[0007] A purging assembly, which is arranged at the bottom of the door frame and is arranged to be capable of purging dust accumulation on both sides of the door plate.
[0008] In an optional embodiment, the purging assembly comprises:
[0009] A nozzle, which is arranged at the bottom of the door frame and located on both sides of the door plate, and is used for spraying gas to both sides of the door plate to purge dust accumulation;
[0010] A gas pipe, one end of which is arranged in the horizontal flue and communicates with the gas inlet of the nozzle, and the other end of which extends out of the horizontal flue and is used for introducing a purging medium.
[0011] In an optional embodiment, the bottom of the door frame is provided with a boss corresponding to the door plate.
[0012] The nozzles are arranged on both sides of the boss in the width direction.
[0013] In an alternative embodiment, the nozzles are embedded in the boss.
[0014] In an alternative embodiment, the number of nozzles is multiple, and the multiple nozzles are arranged in intervals along the width direction of the door frame.
[0015] In an alternative embodiment, the blowing medium is taken from the boiler's own compressed air system.
[0016] In an alternative embodiment, the non-fouling baffle door further comprises:
[0017] A solenoid valve is arranged in the air pipe, and the solenoid valve can be opened and closed intermittently during the operation of the bypass flue to achieve intermittent blowing of the fouling.
[0018] In an alternative embodiment, the solenoid valve is opened once every 10 minutes, and each opening time is 1 minute.
[0019] The above technical solutions of the present application have the following beneficial technical effects:
[0020] The non-fouling baffle door of the present application comprises a door frame, a door plate and a blowing assembly, the blowing assembly is arranged at the bottom of the door frame, and the blowing assembly is arranged to be able to blow the fouling on both sides of the door plate. That is, the non-fouling baffle door can realize blowing, remove the fouling on both sides of the door plate, and prevent the problems of the door plate unable to normally open and close and the reduction of the flue flow area caused by the fouling.
[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. The drawings are incorporated into the specification and form a part of the specification, which show the embodiments consistent with the present application, and are used to illustrate the technical solutions of the present application together with the specification. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.
[0023] Figure 1 Fig. 1 shows a structural schematic diagram of a boiler device provided by the embodiments of the present application;
[0024] Figure 2A structural schematic diagram of a dust-accumulation-resistant baffle door is shown.
[0025] In the drawings:
[0026] 1. boiler body; 11. first smoke outlet; 12. second smoke outlet; 2. heat exchanger; 3. main flue; 4. bypass flue; 5. dust-accumulation-resistant baffle door; 51. door frame; 511. boss; 52. door plate; 53. nozzle; 54. air pipe; 55. electromagnetic valve; 6. adjusting door; 7. mixer; 8. denitration device. DETAILED DESCRIPTION
[0027] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.
[0028] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are for the purpose of explanation only, and are not to be understood as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor fall within the scope of the present application.
[0029] The terms "first", "second" in the specification and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise stated. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.
[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "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 based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0031] In the description of the present application, it should be noted that unless specifically stated and limited otherwise, the terms "mounting", "connected", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0032] Reference Figure 1 The embodiment of the present application provides a kind of boiler equipment, which comprises boiler body 1, heat exchanger 2, main flue 3, bypass flue 4, not easy to accumulate ash baffle door 5, adjusting door 6, mixer 7 and denitration device 8.The first smoke outlet 11 and the second smoke outlet 12 are arranged in boiler body 1, and the first smoke outlet 11 is used to output low-temperature flue gas, and the second smoke outlet 12 is used to output high-temperature flue gas. Heat exchanger 2 is arranged in boiler body 1, and heat exchanger 2 is used for flue gas heat exchange in boiler body 1 to reduce flue gas temperature. One end of main flue 3 is communicated with first smoke outlet 11, and the other end is communicated with denitration device 8, and main flue 3 is used to transport the flue gas after cooling. One end of bypass flue 4 is communicated with the second smoke outlet 12 of boiler body 1, and the other end is communicated with main flue 3, and bypass flue 4 is used to transport high-temperature flue gas in boiler body 1. Not easy to accumulate ash baffle door 5 is arranged in bypass flue 4, and not easy to accumulate ash baffle door 5 is mainly used to control the opening and closing of bypass flue 4. Adjusting door 6 is arranged in bypass flue 4, and adjusting door 6 is mainly used to adjust the flue gas volume of bypass flue 4. Mixer 7 is arranged at the intersection of bypass flue 4 and main flue 3, and mixer 7 is used to mix two flue gases.
[0033] When the load of boiler decreases, not easy to accumulate ash baffle door 5 in bypass flue 4 is first opened, at this time, high-temperature flue gas is divided into two routes, one route directly flows from boiler body 1 to bypass flue 4, and then flows into main flue 3 through bypass flue 4, and the other route is cooled after heat exchange with heat exchanger 2, becomes low-temperature flue gas and flows into main flue 3, and the two flue gases are mixed after mixer 7 and then enter denitration device 8 for denitration. In the above process, the flue gas volume of bypass flue 4 can be adjusted by adjusting door 6, so as to control the inlet flue gas temperature of denitration device 8.
[0034] When the load of boiler increases, the inlet flue gas temperature of denitration device 8 increases, and gradually closing adjusting door 6 can reduce the inlet flue gas temperature of denitration device 8. Until adjusting door 6 is completely closed, not easy to accumulate ash baffle door 5 can be controlled to close bypass flue 4, so that bypass flue 4 exits operation.
[0035] Optionally, reference Figure 1The bypass flue 4 comprises a horizontal flue and a vertical flue, the non-fouling damper door 5 is arranged in the horizontal flue, and the adjusting door 6 is arranged in the vertical flue. In actual operation, when the boiler is in low-load operation for a long time, the bypass flue 4 has a large amount of flue gas, and the horizontal flue where the non-fouling damper door 5 is arranged is prone to fouling. As the fouling thickness increases, resistance is formed when the non-fouling damper door 5 is closed, which causes operation failure. At the same time, the flue flow area is reduced, which leads to an increase in flue gas flow rate and aggravates the wear of equipment components. After a long time of operation, the high-temperature flue gas flow effect of the bypass flue 4 is affected.
[0036] Optionally, referring to Figure 1 The boiler device further comprises expansion joints, the expansion joints are arranged in the bypass flue 4, and are used to absorb displacement and deformation of pipelines, flues or devices caused by thermal expansion and contraction, mechanical vibration or installation errors. In a specific arrangement, the number of expansion joints can be multiple, and the multiple expansion joints are distributed along the flue gas flow direction of the bypass flue 4. For example, the expansion joints comprise a first expansion joint, a second expansion joint and a third expansion joint, the first expansion joint is arranged at the air inlet end of the non-fouling damper door 5, the second expansion joint is arranged at the air inlet end of the adjusting door 6, and the third expansion joint is arranged at the air inlet end of the mixer 7.
[0037] Optionally, referring to Figure 2 The non-fouling damper door 5 comprises a door frame 51, a door plate 52 and a blowing assembly. The door frame 51 is arranged in the horizontal flue. The door plate 52 is arranged in the door frame 51 and can rotate relative to the door frame 51 to open and close the bypass flue 4. The blowing assembly is arranged at the bottom of the door frame 51 and is arranged to be capable of blowing away the fouling on both sides of the door plate 52. That is, the non-fouling damper door 5 of the bypass flue 4 can be blown to remove the fouling on both sides of the non-fouling damper door 5, thereby preventing problems such as the non-fouling damper door 5 being unable to normally open and close due to fouling and the flue flow area being reduced.
[0038] Optionally, the door plate 52 is a swing door, and the door plate 52 is not affected by the fouling resistance when being swung. For example, as shown in Figure 2 , the door plate 52 is swung in the counterclockwise direction, so that the fouling deposited on the left side of the door plate 52 does not generate resistance to the door plate 52, and the opening of the door plate 52 is not affected.
[0039] Optionally, referring to Figure 2The blowing assembly comprises a nozzle 53 and a gas pipe 54. The nozzle 53 is arranged at the bottom of the door frame 51 and on both sides of the door plate 52, and is used to blow air to both sides of the door plate 52 to blow away the accumulated dust. One end of the gas pipe 54 is arranged in the horizontal flue and is in communication with the air inlet of the nozzle 53, and the other end extends out of the horizontal flue and is used to introduce the blowing medium. In specific use, the blowing medium can be delivered to the nozzle 53 by the gas pipe 54, and then blown out by the nozzle 53 to blow away the dust deposited on both sides of the door plate 52.
[0040] Optionally, referring to Figure 2 The bottom of the door frame 51 is provided with a boss 511 corresponding to the door plate 52, and the nozzle 53 is arranged on both sides of the boss 511 in the width direction. In this way, interference between the nozzle 53 and the door plate 52 can be avoided.
[0041] Optionally, the nozzle 53 is embedded in the boss 511. In this way, dead angles can be avoided on the surface of the nozzle 53, so that part of the accumulated dust cannot be blown away.
[0042] Optionally, the air inlet of the nozzle 53 is in communication with the gas pipe 54 through a tee joint. For example, the tee joint is arranged in the boss 511, the two air outlets of the upper part of the tee joint are in communication with the air inlets of the nozzles 53 on both sides, and the air inlet of the lower part of the tee joint is in communication with the air outlet of the gas pipe 54.
[0043] Optionally, the number of nozzles 53 is multiple, and the multiple nozzles 53 are arranged at intervals along the width direction of the door frame 51. Specifically, the nozzles 53 are divided into two columns, one column blows to one side of the door plate 52, and the other column blows to the other side of the door plate 52. In this way, the blowing area can be expanded, and dead angles can be avoided, so as to ensure the blowing effect.
[0044] Optionally, the blowing medium is taken from the boiler's own compressed air system. That is, the blowing medium is compressed air provided by the boiler's own compressed air system. Of course, the blowing medium can also be provided by other compressed air systems.
[0045] Optionally, the non-dust accumulation baffle door 5 further comprises a solenoid valve 55 arranged in the gas pipe 54. The solenoid valve 55 can be intermittently opened and closed during the operation of the bypass flue 4 to realize intermittent blowing of the accumulated dust. In specific arrangement, the solenoid valve 55 is electrically connected with a controller, and the controller is configured to control the solenoid valve 55 to be intermittently opened and closed. Compared with continuous blowing, this can reduce energy consumption and improve the power generation efficiency of the boiler.
[0046] Optionally, the electromagnetic valve 55 is opened once every 10 minutes, and each opening time is 1 minute. According to the actual operation data of the thermal power unit, the accumulation thickness of fly ash on both sides of the non-easy-to-accumulate baffle door 5 is about 0.5-2 mm / 10 minutes. If the blowing interval is <10 minutes (such as 5 minutes / time), the amount of accumulated ash is small but the frequency is too high, which can cause the increase of compressed air consumption, and the action of the electromagnetic valve 55 can easily cause component fatigue (such as wear of the electromagnetic valve 55 valve core). If the blowing interval is >10 minutes (such as 30 minutes / time), the accumulated ash can be accumulated to 5-10 mm, or even form a "bridge" (especially at high temperatures, part of the ash is sintered), at this time, single blowing is difficult to completely remove, which can cause the increase of opening resistance of the non-easy-to-accumulate baffle door 5 and other problems. In addition, when the compressed air is blown at a pressure of 0.6-0.8 MPa through the nozzle 53 (the caliber is usually 8-15 mm), the airflow speed can reach 150-200 m / s, and enough time is needed to "blow the accumulated ash on the top of the boss 511 away from the bottom frame of the non-easy-to-accumulate baffle door 5" and take it away with the flue gas flow. If the single time is <1 minute (such as 30 seconds): the airflow can only disturb the surface layer of the accumulated ash, and the bottom layer of the ash is not completely removed, causing a vicious cycle of "repeated accumulation-partial blowing". If the single time is >1 minute (such as 2 minutes): more than the time required for the migration of the accumulated ash, the excess compressed air will be wasted (the energy consumption of the preparation of compressed air is about 0.15-0.3 kWh / Nm 3 ), and at the same time, the continuous high-speed airflow can cause "erosion wear" to the metal surface of the bottom frame of the non-easy-to-accumulate baffle door 5 (especially when the ash contains hard particles).
[0047] The operation control method of the non-easy-to-accumulate baffle door of the embodiment of the application comprises the following steps:
[0048] In step S101, when the bypass flue 4 is put into operation, the door plate 52 is opened, and the blowing assembly is controlled to blow the accumulated ash on both sides of the door plate 52.
[0049] In step S101, when the bypass flue 4 is taken out of operation, the door plate 52 is closed, and the blowing assembly is controlled to stop working.
[0050] Optionally, in step S101, when the accumulated ash on both sides of the door plate 52 is blown, the blowing assembly is controlled to blow once every 10 minutes, and each blowing time is 1 minute.
[0051] The non-easy-to-accumulate baffle door of the embodiment of the application comprises a door frame 51, a door plate 52 and a blowing assembly. The blowing assembly is arranged at the bottom of the door frame 51, and the blowing assembly is arranged to be capable of blowing the accumulated ash on both sides of the door plate 52. That is, the non-easy-to-accumulate baffle door 5 can realize blowing, remove the accumulated ash on both sides of the door plate 52, and prevent the problems of the door plate 52 unable to normally open and close and the reduction of the flue flow area caused by the accumulated ash.
[0052] It is intended that all such additional substitutions, modifications and variations be included within the scope of the application, the general principles and specific embodiments described herein are intended to be illustrative only and not restrictive. Accordingly, all such modifications and variations without departing from the spirit and scope of the application are intended to be included herein.
[0053] The above description is only specific embodiments of the application, but the protection scope of the application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be included in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.
Claims
1. A baffle door that is not prone to ash accumulation, suitable for use in the horizontal flue of a boiler bypass flue, for opening and closing the boiler bypass flue, characterized in that, The baffle door that is not prone to dust accumulation includes: A door frame, wherein the door frame is disposed within the horizontal flue; A door panel, which is disposed within the door frame and is rotatable relative to the door frame to open or close the bypass flue; A blowing assembly is disposed at the bottom of the door frame and is configured to blow away accumulated dust on both sides of the door panel.
2. The dust-resistant baffle door according to claim 1, characterized in that, The purging assembly includes: The nozzles are located at the bottom of the door frame and on both sides of the door panel, and are used to spray air onto both sides of the door panel to blow away accumulated dust. The air pipe has one end located inside the horizontal flue and connected to the air inlet of the nozzle, and the other end extends out of the horizontal flue and is used to introduce the purging medium.
3. The dust-resistant baffle door according to claim 2, characterized in that, The bottom of the door frame is provided with a protrusion corresponding to the door panel; The nozzles are located on both sides of the boss in the width direction.
4. The dust-resistant baffle door according to claim 2, characterized in that, The nozzle is embedded in the boss.
5. The dust-resistant baffle door according to claim 2, characterized in that, The number of nozzles is multiple, and the multiple nozzles are arranged at intervals along the width direction of the door frame.
6. The dust-resistant baffle door according to claim 2, characterized in that, The purging medium is taken from the boiler's own compressed air system.
7. The dust-resistant baffle door according to claim 2, characterized in that, The baffle door that is not prone to dust accumulation also includes: A solenoid valve is disposed in the gas pipe, and the solenoid valve can be opened and closed intermittently during the operation of the bypass flue to achieve intermittent ash blowing.
8. The dust-resistant baffle door according to claim 7, characterized in that, The solenoid valve opens once every 10 minutes, and each opening lasts for 1 minute.