A four-corner tangential boiler with a hearth flow field despinning function

Abstract

Embodiments of the present application provide a four-corner tangentially fired boiler with a hearth flow field despinning function, which comprises a hearth, four groups of burners respectively arranged at four corners of the hearth, four groups of overfire air respectively arranged at the four corners of the hearth, and a despinning device. The burners, the overfire air and the despinning device are sequentially arranged along the height direction of the hearth from bottom to top. The despinning device has an air inlet and an air outlet. The air inlet is arranged outside the hearth, and the air outlet is arranged inside the hearth. The orientation of the air outlet is perpendicular to the height direction of the hearth. The external gas discharged from the air outlet of the four-corner tangentially fired boiler with the hearth flow field despinning function can be in counterflow with the rotating air flow above the overfire air to despin the rotating air flow at the upper part of the hearth, reduce the rotating kinetic energy of the flow field at the upper part of the hearth, and make the rotating air flow at the upper part of the hearth slowly rise to the top of the hearth and the gas outlet, thereby avoiding problems such as overheating, coking or pipe explosion of the inner wall of the upper part of the hearth, the inner wall of the top of the hearth and the gas outlet of the hearth.

Description

TECHNICAL FIELD

[0001] The embodiment of the application belongs to the technical field of boilers, and particularly relates to a four-corner tangential circle boiler with a hearth flow field despinning function. BACKGROUND

[0002] To achieve the established "double carbon" strategic goal, China's energy transformation process is accelerating, and a new power system with clean and low carbon, safe and controllable, flexible and efficient, intelligent and friendly, and open and interactive basic characteristics is being established. After large-scale grid connection of new energy with strong intermittency and large volatility, coal-fired generating units as ballast and basic power in the power generation block will be fully involved in deep peak shaving and further improve the operation safety and reliability to meet the safety requirements of the new power system.

[0003] At present, most of the factors affecting the safe operation of coal-fired generating units are derived from power station boilers, mainly manifested as boiler heating surface over-temperature, furnace coking, and non-normal shutdown of the unit caused by over-temperature pipe burst of the heating surface. The above problems are closely related to the flow field in the boiler furnace, especially for the four-corner tangential circle combustion boiler with a very high share rate, the problem is particularly obvious. Because the design of the four-corner tangential circle boiler is a whole rotating upward airflow, this upward mode will inevitably lead to a large amount of flue gas on one side and a small amount of flue gas on the other side of the upper part and the outlet of the furnace. If the rotational flow intensity cannot be effectively weakened, it will lead to over-temperature, coking, and even pipe burst of the heating surface on the side with a large amount of flue gas.

[0004] The despinning of the upper flow field in the four-corner tangential circle combustion boiler furnace is a problem that must be solved. If the problem cannot be solved, it will directly lead to long-term over-temperature of the heating surface, damage to the pipe material, pipe burst of the heating surface, and unit trip accidents, which will have a major impact on the safe operation of the unit equipment and the power grid.

[0005] To solve the problem of excessive rotational flow intensity of the flow field in the four-corner tangential circle combustion boiler furnace of the coal-fired generating unit, the following methods are currently mainly used:

[0006] (1) Boiler combustion optimization adjustment test: This method is to reduce the rotational flow intensity of the flow field in the upper part or outlet of the furnace by adjusting the air distribution of the multi-layer secondary air or adjusting the horizontal angle of the overfire air under the existing equipment conditions. This method has certain effect at medium and high loads, but at low load or deep peak shaving of the unit, since the furnace volume is constant, the flame fullness in the furnace is low, and the secondary air and overfire air are less, the despinning effect is greatly reduced, and the flow field despinning in the upper part or outlet of the furnace cannot be basically achieved.

[0007] (2) Pulverized coal burner modification

[0008] The burner modification is one of the means for solving the boiler combustion problem, and has the characteristics of great technical difficulty, high cost and long period, and when facing the four-corner tangential combustion mode boiler, it is difficult to achieve effective effect in solving the problem of too large flow field swirl intensity in the furnace, and improper modification will lead to deterioration of boiler combustion, directly affecting the normal operation of the unit.

[0009] Based on the above situation, a four-corner tangential boiler capable of solving the problem of too large flow field swirl intensity in the upper part or outlet of the furnace is urgently needed. SUMMARY

[0010] Embodiments of the present application aim to at least solve one of the technical problems existing in the prior art, and provide a four-corner tangential boiler with a furnace flow field deswirl function.

[0011] Embodiments of the present application provide a four-corner tangential boiler with a furnace flow field deswirl function, which comprises:

[0012] a furnace;

[0013] four groups of burners, each group of burners being arranged at a corner of the furnace;

[0014] four groups of overfire air, each group of overfire air being arranged at a corner of the furnace;

[0015] a deswirl device, the burners, the overfire air and the deswirl device being arranged in sequence from bottom to top along the height direction of the furnace, the deswirl device having an air inlet and an air outlet, the air inlet being arranged outside the furnace, the air outlet being arranged inside the furnace, and the air outlet being perpendicular to the height direction of the furnace.

[0016] In some embodiments of the present application, the deswirl device comprises:

[0017] a deswirl air pipe, the deswirl air pipe being rotatably connected to the furnace, the deswirl air pipe being rotatable about a central axis thereof, the central axis of the deswirl air pipe being perpendicular to the height direction of the furnace, the central axis of the deswirl air pipe passing through the center line of the furnace, or the extension line of the central axis of the deswirl air pipe passing through the center line of the furnace, and the air inlet and the air outlet being arranged in the deswirl air pipe.

[0018] In some embodiments of the present application, a plurality of air outlets are arranged on the deswirl air pipe, and the plurality of air outlets are arranged at intervals along the length direction of the deswirl air pipe.

[0019] In some embodiments of the present application, the orientations of the plurality of air outlets are the same.

[0020] In some embodiments of the present application, the number of the despun wind pipes is multiple, and the multiple despun wind pipes are in the same plane and are spaced and uniformly arranged.

[0021] In some embodiments of the present application, the despun device further comprises:

[0022] A suspension pipe is connected with the furnace, one end of the despun wind pipe is rotatably connected with the side wall of the furnace, and the other end of the despun wind pipe is rotatably connected with the suspension pipe.

[0023] In some embodiments of the present application, the length direction of the suspension pipe is the same as the height direction of the furnace, and the suspension pipe is located in the center of the furnace.

[0024] In some embodiments of the present application, the suspension pipe has a cooling inlet, a cooling outlet and a cooling channel, the cooling channel is communicated with the cooling inlet and the cooling outlet, and the cooling inlet and the cooling outlet are both located outside the furnace.

[0025] In some embodiments of the present application, the despun device comprises:

[0026] A rotating handle is connected with the despun wind pipe, and the rotating handle is arranged outside the furnace in a rotatable manner relative to the furnace.

[0027] In some embodiments of the present application, the four-corner tangential circle boiler with the furnace flow field despun function further comprises:

[0028] A plurality of cooling assemblies, each of which extends from the top of the furnace to the inside of the furnace along the height direction of the furnace, is located above the air outlet, and the plurality of cooling assemblies are uniformly distributed in the furnace.

[0029] The four-corner tangential boiler with the hearth flow field despinning function of the embodiment of the present application comprises a hearth, four groups of burners, four groups of overfire air and a despinning device, wherein the four groups of burners are respectively arranged at the four corners of the hearth, the four groups of overfire air are respectively arranged at the four corners of the hearth, and the burners, the overfire air and the despinning device are sequentially arranged from bottom to top along the height direction of the hearth, that is, the despinning device is located above the burners and the overfire air. The despinning device has an air inlet and an air outlet, the air inlet of the despinning device is arranged outside the hearth, the air outlet of the despinning device is arranged inside the hearth, and the direction of the air outlet can be perpendicular to the height direction of the hearth, that is, the direction of the air outlet can be in a plane perpendicular to the height direction of the hearth. External gas enters the despinning device through the air inlet of the despinning device outside the hearth and is discharged into the inside of the hearth through the air outlet, the air outlet can discharge air in the plane perpendicular to the height direction of the hearth, and the gas of the air outlet can be in convection with the rotating gas flow above the overfire air to despin the rotating gas flow at the upper part of the hearth, reduce the rotating kinetic energy of the flow field at the upper part of the hearth, and make the rotating gas flow at the upper part of the hearth more slowly and gently rise to the top of the hearth and the gas outlet, thereby preventing the situation that the amount of flue gas on one side is larger and the amount of flue gas on the other side is smaller at the upper part of the hearth or the outlet, avoiding the problems such as over-temperature, coking or pipe explosion of the inner wall of the upper part of the hearth and the inner wall of the top of the hearth, and ensuring the normal operation of the boiler. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the four-corner tangential boiler with the hearth flow field despinning function of the embodiment of the present application;

[0031] Figure 2 It is Figure 1 It is a left view of the four-corner tangential boiler with the hearth flow field despinning function shown in the figure;

[0032] Figure 3 It is Figure 1 It is an A-A sectional view shown in the figure;

[0033] Figure 4 It is Figure 1 It is a B-B sectional view shown in the figure.

[0034] In the drawings, various reference signs represent the following:

[0035] 100, four-corner tangential boiler with hearth flow field despinning function;

[0036] 10, hearth; 11, side wall; 101, outlet;

[0037] 20, burner;

[0038] 30, overfire air;

[0039] 40, racemizing device; 41, racemizing duct; 411, inlet; 412, outlet; 42, suspension duct; 43, fixed support; 44, rotating handle;

[0040] 50, cooling assembly. DETAILED DESCRIPTION

[0041] Example embodiments of the present application will now be described in detail with reference to the accompanying drawings. Although example embodiments of the present application are shown in the drawings, it should be understood that the present application can be embodied in various forms without being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0042] It should be understood that the terms used herein are merely for the purpose of describing particular example embodiments and are by no means intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," and "including" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0043] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0044] For ease of description, spatially relative terms can be used herein for the purpose of illustrating one element's or feature's relationship to another element or feature as shown in the figures. Such spatially relative terms include "internal", "external", "inward", "outward", "under", "below", "above", "on", "above", and the like. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device is inverted, then an element described as "below" or "beneath" another element or feature would now be "above" or "over" such other element or feature. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0045] As shown in Figures 1 to 4 An embodiment of the present application provides a four-corner tangential boiler 100 with a hearth flow field despinning function. The four-corner tangential boiler 100 with the hearth flow field despinning function comprises a hearth 10, four sets of burners 20, four sets of overfire air 30, and a despinning device 40. Specifically, the four sets of burners 20 are respectively arranged at the four corners of the hearth 10, the four sets of overfire air 30 are respectively arranged at the four corners of the hearth 10, and the burners 20, the overfire air 30, and the despinning device 40 are sequentially arranged from bottom to top along the height direction of the hearth 10. The despinning device 40 has an air inlet 411 and an air outlet 412. The air inlet 411 is arranged outside the hearth 10, and the air outlet 412 is arranged inside the hearth 10. The air outlet 412 is oriented perpendicularly to the height direction of the hearth 10.

[0046] The four-corner tangential boiler 100 with the hearth flow field despinning function of the embodiment of the present application comprises a hearth 10, four groups of burners 20, four groups of overfire air 30 and a despinning device 40, wherein the four groups of burners 20 are respectively arranged at the four corners of the hearth 10, the four groups of overfire air 30 are respectively arranged at the four corners of the hearth 10, and the burners 20, the overfire air 30 and the despinning device 40 are sequentially arranged from bottom to top along the height direction of the hearth 10, that is, the despinning device 40 is located above the burners 20 and the overfire air 30. The despinning device 40 has an air inlet 411 and an air outlet 412, the air inlet 411 of the despinning device 40 is arranged outside the hearth 10, the air outlet 412 of the despinning device 40 is arranged inside the hearth 10, and the direction of the air outlet 412 can be perpendicular to the height direction of the hearth 10, that is, the direction of the air outlet 412 can be in a plane perpendicular to the height direction of the hearth 10. External gas enters the despinning device 40 through the air inlet 411 of the despinning device 40 outside the hearth 10 and is discharged into the inside of the hearth 10 through the air outlet 412, the air outlet 412 can discharge air in a plane perpendicular to the height direction of the hearth 10, and the gas of the air outlet 412 can be in convection with the rotating gas flow above the overfire air 30 to despin the rotating gas flow at the upper part of the hearth 10, reduce the rotational kinetic energy of the flow field at the upper part of the hearth 10, and make the rotating gas flow at the upper part of the hearth 10 more slowly and gently rise to the top of the hearth 10 and the gas outlet, thereby preventing the situation that the amount of flue gas on one side is larger and the amount of flue gas on the other side is smaller at the upper part of the hearth 10 or the outlet 101, avoiding the problems of over-temperature, coking or pipe explosion of the gas outlet of the hearth 10, the inner wall of the upper part of the hearth 10 and the inner wall of the top of the hearth 10, and ensuring the normal operation of the boiler.

[0047] In some embodiments of the present application, the despinning device 40 comprises a despinning air pipe 41, the air inlet 411 and the air outlet 412 are arranged in the despinning air pipe 41, and the external gas enters the despinning air pipe 41 through the air inlet 411 of the despinning air pipe 41 and is discharged into the hearth 10 through the air outlet 412 of the despinning air pipe 41. The despinning air pipe 41 is rotatably connected to the hearth 10, the despinning air pipe 41 can rotate around the central axis thereof, and the central axis of the despinning air pipe 41 is perpendicular to the height direction of the hearth 10, so as to ensure that the rotation axis of the despinning air pipe 41 is perpendicular to the height direction of the hearth 10 and rotates, and as the despinning air pipe 41 rotates around the central axis thereof, the air outlet 412 rotates together with the despinning air pipe 41, and the air outlet 412 of the despinning air pipe 41 can rotate in a plane perpendicular to the height direction of the hearth 10, so that the air outlet 412 of the despinning air pipe 41 forms convection with the rotating gas flow in the hearth 10, thereby reducing the helical kinetic energy of the flow field above the overfire air 30 in the hearth 10.

[0048] Further, in order to ensure the effect of the deswirler 40, the central axis of the deswirler duct 41 passes through the center line of the furnace 10, or the extension line of the central axis of the deswirler duct 41 passes through the center line of the furnace 10, so as to increase the contact area of the external gas outside the air outlet 412 with the rotating gas flow, and then more external gas is in convection with the rotating gas flow, and then the deswirling capacity of the deswirler 40 is improved.

[0049] The deswirler duct 41 can rotate 360 degrees around the central axis, and according to different requirements at different positions, the direction of the air outlet 412 of the corresponding deswirler duct 41 can be adjusted to be perpendicular to the height direction of the furnace 10. The external gas passing through the air outlet 412 can maximize the deswirling of the original rotating gas flow in the furnace 10.

[0050] When the gas flow in the furnace 10 does not need to be deswirled, the direction of the air outlet 412 of the deswirler duct 41 can be adjusted to be parallel to the height direction of the furnace 10 and downward, and the external gas passing through the air outlet forms counterflow mixing with the upward gas flow in the furnace 10, so that the mixing effect is better and the flow field adjustment is more effective; or the direction of the air outlet 412 of the deswirler duct 41 can be adjusted to be parallel to the height direction of the furnace 10 and upward, and the external gas passing through the air outlet is discharged into the furnace 10, which can improve the flame center height in the furnace 10.

[0051] In some embodiments of the present application, a plurality of air outlets 412 are arranged on the deswirler duct 41, and the plurality of air outlets 412 are arranged along the length direction of the deswirler duct 41. The plurality of air outlets 412 can make more external gas convection with the rotating gas flow in the furnace 10, and then improve the deswirling capacity of the deswirler 40. Further, the plurality of air outlets 412 are uniformly arranged along the length direction of the deswirler duct 41, so that the external gas is uniformly discharged into the interior of the furnace 10 through the plurality of air outlets 412 of the deswirler duct 41, so that the rotating gas flow in the furnace 10 is subjected to more uniform convection of the external gas, and the spiral kinetic energy of the rotating gas flow in the furnace 10 is more uniform.

[0052] In some embodiments of the present application, the directions of the plurality of air outlets 412 are the same, so as to ensure that the plurality of air outlets 412 more concentratedly use the external gas to resist the rotating kinetic energy of the rotating gas flow, and improve the deswirling capacity of the deswirler 40.

[0053] In some embodiments of the present application, the number of deswirler ducts 41 is multiple, and the plurality of deswirler ducts 41 can increase the convection area of the external gas with the rotating gas flow in the furnace 10, so that the external gas of the air outlet 412 of the deswirler duct 41 can offset more spiral kinetic energy, and then the deswirling capacity of the deswirler 40 is improved. The plurality of deswirler ducts 41 are in the same plane, and the plurality of deswirler ducts 41 are spaced and uniformly arranged, so that the furnace 10 is more uniformly stressed.

[0054] Meanwhile, the despinning air duct 41 can rotate 360 degrees around the central axis, and multiple despinning air ducts 41 can realize different rotation angles respectively. According to different requirements of different positions, the outlet 412 of the corresponding despinning air duct 41 can be adjusted to be perpendicular to the height direction of the furnace 10, so that the external gas passing through the outlet 412 can maximize the despinning of the original rotating airflow in the furnace 10; or the outlet 412 of the despinning air duct 41 is adjusted to be parallel to the height direction of the furnace 10 and downward, so that the external gas passing through the outlet forms countercurrent mixing with the upward airflow in the furnace 10, so that the mixing effect is better and the flow field adjustment is more effective; or the outlet 412 of the despinning air duct 41 is adjusted to be parallel to the height direction of the furnace 10 and upward, so that the external gas passing through the outlet is discharged into the furnace 10, which can improve the flame center height in the furnace 10. The working fluid flow rate and the rotation angle of each despinning air duct 41 can be independently controlled according to specific needs, so as to realize multiple coupling and optimal configuration of the momentum and vector of the flow field in the furnace 10, and improve the flexibility and diversity of the flow field adjustment in the furnace.

[0055] Specifically, the number of despinning air ducts 41 in the embodiment is four, and the four despinning air ducts 41 are connected with the four side walls 11 of the furnace 10, and the included angle between adjacent two despinning air ducts 41 is 90 degrees. One end of each despinning air duct 41 is rotationally connected with one side wall 11, and the other end of the despinning air duct 41 is close to or located at the center of the furnace 10.

[0056] In some embodiments of the present application, the despinning device 40 further comprises a suspension pipe 42 connected with the furnace 10, one end of the despinning air duct 41 is rotationally connected with the side wall 11 of the furnace 10, and the other end of the despinning air duct 41 is rotationally connected with the suspension pipe 42. That is, the suspension pipe 42 connected with the furnace 10 supports the despinning air duct 41, so as to avoid the position deviation of the despinning air duct 41 in the furnace 10, and further to ensure the despinning ability of the despinning air duct 41.

[0057] In some embodiments of the present application, the length direction of the suspension pipe 42 is the same as the height direction of the furnace 10, so as to ensure that the setting of the suspension pipe 42 will not affect the normal air outlet of the despinning air duct 41. The suspension pipe 42 is located at the center of the furnace 10, and the four despinning air ducts 41 are rotationally connected with the suspension pipe 42, so as to ensure that the suspension pipe 42 is uniformly stressed and the service life of the suspension pipe 42 is improved.

[0058] In some embodiments of the present application, the suspension pipe 42 has a suspension inlet, a suspension outlet and a cooling channel, the cooling channel being in communication with the suspension inlet and the suspension outlet, the suspension inlet and the suspension outlet being located outside the furnace 10. The cooling medium enters the cooling channel of the suspension pipe 42 through the suspension inlet of the suspension pipe 42 and is discharged from the suspension pipe 42 through the suspension outlet. The suspension pipe 42 is cooled by the cooling medium to avoid overheating of the suspension pipe 42 by the hot gas flow, slow down the fatigue time of the suspension pipe 42 and improve the service life of the suspension pipe 42. Specifically, the cooling medium can be water or steam.

[0059] In some embodiments of the present application, the suspension pipe 42 is rotatably connected to the plurality of despinning wind pipes 41 through the fixed support 43. Specifically, the fixed support 43 is provided with a suspension interface, and the suspension pipe 42 is fixedly connected to the suspension interface. The fixed support 43 is provided with a plurality of despinning interfaces, in this embodiment, four despinning interfaces, and the four despinning interfaces are rotatably connected to the four despinning wind pipes 41, respectively. The suspension interface and the four despinning interfaces are perpendicular, respectively, and adjacent two of the four despinning interfaces are perpendicular. The fixed support 43 can ensure the reliability of the connection between the suspension pipe 42 and the despinning wind pipes 41, and at the same time, the fixed support 43 and the side wall 11 of the furnace 10 can ensure that the despinning wind pipes 41 cannot be displaced and can be rotated.

[0060] In some embodiments of the present application, the despinning device 40 comprises a rotating handle 44, the rotating handle 44 being connected to the despinning wind pipe 41 and being arranged outside the furnace 10 in a rotatable manner relative to the furnace 10. The rotating handle 44 can be used to rotate the despinning wind pipe 41 to adjust the rotation angle of the despinning wind pipe 41, thereby adapting to different gas flow conditions in the furnace 10. Specifically, each despinning wind pipe 41 is provided in correspondence with a rotating handle 44 to ensure that each despinning wind pipe 41 can independently set the rotation angle. The rotating handle 44 can be a manually controlled handle or an electrically controlled handle.

[0061] In some embodiments of the present application, the four-corner tangential circle boiler 100 with the despinning function of the furnace flow field further comprises a cooling assembly 50, the cooling assembly 50 extending from the top of the furnace 10 to the inside of the furnace 10, and the high-temperature gas at the upper and top parts of the furnace 10 is cooled by the cooling assembly 50 to reduce the damage of the high-temperature gas to the upper, top and outlet 101 of the furnace 10, and to reduce the problems of over-temperature, coking or pipe explosion of the upper, top and outlet 101 of the furnace 10.

[0062] Specifically, along the height direction of the furnace 10, the cooling assembly 50 is located above the air outlet 412, and the air outlet 412 is located between the overfire air 30 and the cooling assembly 50 to de-rotate the airflow between the overfire air 30 and the cooling assembly 50. Multiple sets of cooling assemblies 50 are uniformly distributed in the furnace, and the airflow in the furnace 10 is cooled by the multiple sets of cooling assemblies 50 to improve the cooling effect.

[0063] In the embodiment of the present application, each air outlet 412 is provided with a de-rotation nozzle, through which the external gas can be more concentrated when sprayed, further weakening the spiral kinetic energy of the airflow. In addition, the external gas flowing into the de-rotation air pipe 41 can be air, which can achieve the de-rotation function of the gas in the furnace 10, and also can supplement oxygen for combustion in the furnace 10.

[0064] The operation process of the four-corner tangential boiler 100 with the furnace flow field de-rotation function:

[0065] 1) Before the boiler is ignited and started, water is sent into the inside of the suspension pipe 42, the sent water enters from the suspension inlet of the suspension pipe 42 and is discharged from the suspension outlet; the inside of the suspension pipe 42 is kept completely filled with water and a continuous and stable water flow is formed, and the cooling of the suspension pipe 42 is started;

[0066] 2) Before the boiler is ignited and started, the rotation handle 44 of the de-rotation air pipe 41 is adjusted, and the directions of the de-rotation nozzles of the four de-rotation air pipes 41 are all adjusted to be vertically downward and the positions are fixed;

[0067] 3) Before the boiler is ignited and started, air is sent into the inside of the four de-rotation air pipes 41, the sent air enters the pipes from the air inlets 411 of the four de-rotation air pipes 41, is sprayed from the nozzles of the de-rotation air pipes 41 and enters the inside of the furnace 10, and the air quantity in the four de-rotation air pipes 41 is kept low to cool the de-rotation air pipes 41 in advance;

[0068] 4) During the normal operation of the boiler after ignition and start, the water quantity sent by the suspension pipe 42 is gradually increased to ensure that the suspension pipe 42 can be normally cooled, and the air quantity in the four de-rotation air pipes 41 is gradually increased to ensure that the four de-rotation air pipes 41 can be normally cooled;

[0069] 5) According to the needs of the combustion condition in the furnace of the boiler, the air flow speed and momentum of the de-rotation nozzles on the four de-rotation air pipes 41 are controlled by separately adjusting the air quantity in the four de-rotation air pipes 41 to control the rotational momentum of the airflow in the region between the overfire air 30 and the cooling assembly 50;

[0070] 6) According to the needs of the combustion condition in the furnace of the boiler, the directions of the airflow of the de-rotation nozzles on the four de-rotation air pipes 41 are controlled by separately adjusting the rotation handle 44 on the four de-rotation air pipes 41 to control the rotational direction of the airflow in the region between the overfire air 30 and the cooling assembly 50;

[0071] 7) According to the flow field or temperature deviation in the furnace 10 and the adjustment needs, the flow field between the over fire air 30 and the cooling assembly 50 is finally adjusted to the best state through multiple coupling adjustments of the steps 5) and 6);

[0072] 8) The device can be installed in the reverse operation of the process 1) ~ 4) when it is shut down.

[0073] It can be understood that the above embodiments are only exemplary embodiments for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and essence of the present application, and these modifications and improvements are also considered to be within the scope of protection of the present application.

Claims

1. A tangentially fired furnace with a flow field de-swirl function, characterized in that, The four-corner tangential boiler with the furnace flow field despinning function comprises: a furnace; four groups of burners, each of which is arranged at a corner of the furnace; four groups of overfire air, each of which is arranged at a corner of the furnace; a despinning device, which is arranged in sequence from bottom to top along the height direction of the furnace, and has an air inlet and an air outlet, wherein the air inlet is arranged outside the furnace, the air outlet is arranged inside the furnace, the orientation of the air outlet can be perpendicular to the height direction of the furnace, and the orientation of the air outlet can be adjusted to be parallel to the height direction of the furnace; the despinning device comprises: a despinning air pipe, which is rotatably connected to the furnace, and can rotate around its central axis, wherein the central axis of the despinning air pipe is perpendicular to the height direction of the furnace, the central axis of the despinning air pipe passes through the center line of the furnace, or the extension line of the central axis of the despinning air pipe passes through the center line of the furnace, and the air inlet and the air outlet are arranged on the despinning air pipe.

2. The tangentially fired furnace with flow field de-swirl function according to claim 1, characterized in that, A plurality of air outlets are arranged on the despinning air pipe, and the plurality of air outlets are arranged at intervals along the length direction of the despinning air pipe.

3. The tangentially fired furnace with flow field de-swirl function according to claim 1, characterized in that, The orientations of the plurality of air outlets are the same.

4. The tangentially fired furnace with flow field de-swirl function according to claim 1, characterized in that, The number of the despinning air pipes is plural, the plurality of despinning air pipes are arranged in the same plane, and the plurality of despinning air pipes are arranged at intervals.

5. The tangentially fired furnace with flow field deswirling function according to any one of claims 2 to 4, characterized in that, The despinning device further comprises: a suspension pipe, which is connected to the furnace, one end of the despinning air pipe is rotatably connected to the side wall of the furnace, and the other end of the despinning air pipe is rotatably connected to the suspension pipe.

6. The tangentially fired furnace with flow field deswirling function according to claim 5, characterized in that, The length direction of the suspension pipe is the same as the height direction of the furnace, and the suspension pipe is located in the center of the furnace.

7. The tangentially fired furnace with flow field deswirling function according to claim 5, characterized in that, The suspension pipe has a cooling inlet, a cooling outlet and a cooling channel, the cooling channel communicates the cooling inlet and the cooling outlet, and the cooling inlet and the cooling outlet are both located outside the furnace.

8. The tangentially fired furnace with flow field deswirling function according to any one of claims 2 to 4, characterized in that, The despinning device comprises: a rotating handle, which is connected to the despinning air pipe, and is arranged outside the furnace in a rotatable manner relative to the furnace.

9. The tangentially fired furnace with flow field deswirling function according to claim 1, characterized in that, The four-corner tangential boiler with the furnace flow field despinning function further comprises: a plurality of cooling assemblies, each of which extends from the top of the furnace to the inside of the furnace, and is arranged above the air outlet along the height direction of the furnace, and the plurality of cooling assemblies are uniformly distributed in the furnace.

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