Four-corner tangential boiler with hearth flow field racemization function

Abstract

The embodiment of the invention provides a four-corner tangential boiler with a hearth flow field racemization function. The four-corner tangential boiler with the hearth flow field racemization function comprises a hearth; the four groups of combustors are respectively arranged at four corners of the hearth; the four groups of over-fire air are respectively arranged at four corners of the hearth; the combustor, the over-fire air and the rotation eliminating device are sequentially arranged in the height direction of the hearth from bottom to top, the rotation eliminating device is provided with an air inlet and an air outlet, the air inlet is formed in the outer portion of the hearth, the air outlet is formed in the inner portion of the hearth, and the orientation of the air outlet can be perpendicular to the height direction of the hearth. According to the four-corner tangential boiler with the hearth flow field rotation eliminating function, external gas exhausted from the air outlet can be in convection with rotating airflow above over fire air, so that the rotating airflow on the upper portion in the hearth is eliminated, the flow field rotation kinetic energy on the upper portion in the hearth is reduced, and the heat efficiency of the boiler is improved. Therefore, the rotary airflow at the upper part in the hearth slowly rises to the top and the air outlet of the hearth, and the problems of overtemperature, coking or pipe explosion and the like of the air outlet of the hearth, the inner wall of the upper part of the hearth and the inner wall of the top of the hearth are avoided.

Description

Technical Field

[0001] The embodiments of the present invention belong to the technical field of boilers, and in particular relate to a four-corner tangential boiler with a furnace flow field derotation function. Background Art

[0002] In order to achieve the established "dual carbon" strategic goals, my country's energy transformation process is accelerating, and a new power system with new energy as the main body and the basic characteristics of clean and low-carbon, safe and controllable, flexible and efficient, intelligent and friendly, and open and interactive is being established. When new energy with strong intermittent and high volatility is connected to the grid on a large scale, it will force coal-fired power generation units, which are the ballast and basic power source of the power generation sector, to fully participate in deep peak regulation and further improve operational safety and reliability to adapt to the safety requirements of the new power system.

[0003] At present, the main factors affecting the safe operation of coal-fired power generation units are mostly from power station boilers, mainly manifested as overheating of the boiler heating surface, coking of the furnace, and abnormal shutdown of the unit caused by overheating of the heating surface. The above problems are closely related to the flow field in the boiler furnace, especially for the four-corner tangential combustion boiler with a very high occupancy rate. This problem is particularly obvious. Because the airflow in the furnace of the four-corner tangential boiler is designed as an overall rotating upward airflow, this upward mode will inevitably lead to a large amount of flue gas on the upper part of the furnace and one side of the outlet, and a biased flue gas on the other side. If the swirl intensity cannot be effectively weakened, it will cause the heating surface on the side with a large amount of flue gas to overheat, coke, and even burst.

[0004] The derotation of the upper flow field in the furnace of a four-corner tangential combustion boiler is a problem that must be solved. If this problem cannot be solved, it will directly lead to long-term overheating of the heating surface, damage to the pipes, explosion of the heating surface, and unit tripping accidents, which will have a major impact on the safe operation of the unit equipment and the power grid.

[0005] In order to solve the problem of excessive swirl intensity in the furnace of the four-corner tangential combustion boiler of coal-fired power generation units, the main methods currently used are as follows:

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

[0007] (2) Pulverized coal burner modification

[0008] Burner modification, as one of the means to solve boiler combustion problems, is technically difficult, costly and time-consuming. When it comes to solving the problem of excessive swirl intensity in the flow field in the furnace for four-corner tangential combustion boilers, it is difficult to achieve effective results. Improper modification will lead to deterioration of boiler combustion and directly affect the normal operation of the unit.

[0009] Based on the above situation, there is an urgent need for a four-corner tangential boiler that can solve the problem of excessive swirl intensity in the upper part of the furnace or the outlet flow field. Summary of the invention

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

[0011] An embodiment of the present invention provides a four-corner tangential boiler with a furnace flow field derotation function, and the four-corner tangential boiler with a furnace flow field derotation function comprises:

[0012] furnace;

[0013] Four groups of burners, the four groups of burners are respectively arranged at four corners of the furnace;

[0014] Four groups of overburnt air, the four groups of overburnt air are respectively arranged at four corners of the furnace;

[0015] The de-cyclone device is provided with the burner, the burnt air and the de-cyclone device in sequence from bottom to top along the height direction of the furnace. The de-cyclone device has an air inlet and an air outlet. The air inlet is provided on the outside of the furnace, and the air outlet is provided on the inside of the furnace. The direction of the air outlet can be perpendicular to the height direction of the furnace.

[0016] In some embodiments of the present invention, the racemization device comprises:

[0017] The decyclone air duct is rotatably connected to the furnace, the decyclone air duct can rotate around its central axis, the central axis of the decyclone air duct is perpendicular to the height direction of the furnace, the central axis of the decyclone air duct passes through the center line of the furnace, or the extension line of the central axis of the decyclone air duct passes through the center line of the furnace, and the air inlet and the air outlet are both arranged on the decyclone air duct.

[0018] In some embodiments of the present invention, the de-cyclone air duct is provided with a plurality of the air outlets, and the plurality of the air outlets are arranged at intervals along the length direction of the de-cyclone air duct.

[0019] In some embodiments of the present invention, the multiple air outlets have the same orientation.

[0020] In some embodiments of the present invention, there are multiple decyclone air ducts, the multiple decyclone air ducts are in the same plane, and the multiple decyclone air ducts are spaced and evenly arranged.

[0021] In some embodiments of the present invention, the racemization device further comprises:

[0022] A suspension pipe is connected to the furnace, one end of the decyclone air pipe is rotatably connected to the side wall of the furnace, and the other end of the decyclone air pipe is rotatably connected to the suspension pipe.

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

[0024] In some embodiments of the present invention, the suspension pipe has a cooling inlet, a cooling outlet and a cooling channel, the cooling channel connects 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 invention, the racemization device comprises:

[0026] A rotating handle is connected to the decyclone air duct, and the rotating handle is arranged outside the furnace in a rotatable manner relative to the furnace.

[0027] In some embodiments of the present invention, the four-corner tangential boiler with furnace flow field derotation function further includes:

[0028] Multiple groups of cooling components, each of which extends from the top of the furnace to the inside of the furnace, along the height direction of the furnace, the cooling components are located above the air outlet, and multiple groups of cooling components are evenly distributed in the furnace.

[0029] The four-corner tangential boiler with furnace flow field derotation function of the embodiment of the present invention comprises a furnace, four groups of burners, four groups of overburnt air and a derotation device, wherein the four groups of burners are respectively arranged at the four corners of the furnace, the four groups of overburnt air are respectively arranged at the four corners of the furnace, and the burners, overburnt air and derotation device are arranged in sequence from bottom to top along the height direction of the furnace, that is, the derotation device is located above the burners and the overburnt air. The derotation device has an air inlet and an air outlet, wherein the air inlet is arranged outside the furnace, and the air outlet is arranged inside the furnace, and the direction of the air outlet can be perpendicular to the height direction of the furnace, that is, the direction of the air outlet can be in a plane perpendicular to the height direction of the furnace. External gas enters the decyclone device through the air inlet of the decyclone device outside the furnace, and is discharged into the interior of the furnace through the air outlet. The air outlet can discharge air in a plane perpendicular to the height direction of the furnace, and the gas at the air outlet can convect with the rotating airflow above the burnt air to decyclone the rotating airflow in the upper part of the furnace, reduce the rotational kinetic energy of the flow field in the upper part of the furnace, and make the rotating airflow in the upper part of the furnace rise more slowly and gently to the top of the furnace and the air outlet, preventing the situation where the flue gas volume on one side of the upper part of the furnace or the outlet is too large and the flue gas volume on the other side is too small, thereby avoiding overheating, coking or pipe bursting at the furnace outlet, the inner wall of the upper part of the furnace and the inner wall of the top of the furnace, and ensuring the normal operation of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a four-corner tangential boiler with furnace flow field derotation function according to an embodiment of the present invention;

[0031] Figure 2 for Figure 1 The left side view of the four-corner tangential boiler with furnace flow field derotation function is shown;

[0032] Figure 3 for Figure 1 AA section view shown;

[0033] Figure 4 for Figure 1 BB cross section shown.

[0034] The reference numerals in the accompanying drawings represent the following:

[0035] 100. A four-corner tangential boiler with furnace flow field derotation function;

[0036] 10. furnace; 11. side wall; 101. outlet;

[0037] 20. Burner;

[0038] 30. Burn the wind;

[0039] 40. De-cyclone device; 41. De-cyclone air duct; 411. Air inlet; 412. Air outlet; 42. Suspension pipe; 43. Fixed bracket; 44. Rotating handle;

[0040] 50. Cooling component. DETAILED DESCRIPTION

[0041] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0042] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0043] Although the terms first, second, third, etc. can be used in the text to describe multiple 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 only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0044] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0045] like Figures 1 to 4 As shown, an embodiment of the present invention provides a four-corner tangential boiler 100 with a furnace flow field derotation function. The four-corner tangential boiler 100 with a furnace flow field derotation function includes: a furnace 10, four groups of burners 20, four groups of combustion air 30 and a derotation device 40. Specifically, the four groups of burners 20 are respectively arranged at the four corners of the furnace 10, and the four groups of combustion air 30 are respectively arranged at the four corners of the furnace 10. Along the height direction of the furnace 10, the burners 20, the combustion air 30 and the derotation device 40 are sequentially arranged from bottom to top. The derotation device 40 has an air inlet 411 and an air outlet 412. The air inlet 411 is arranged outside the furnace 10, and the air outlet 412 is arranged inside the furnace 10. The direction of the air outlet 412 can be perpendicular to the height direction of the furnace 10.

[0046] The four-corner tangential boiler 100 with furnace flow field derotation function according to the embodiment of the present invention comprises a furnace 10, four groups of burners 20, four groups of overburned air 30 and a derotation device 40, wherein the four groups of burners 20 are respectively arranged at the four corners of the furnace 10, the four groups of overburned air 30 are respectively arranged at the four corners of the furnace 10, and the burners 20, the overburned air 30 and the derotation device 40 are arranged in sequence from bottom to top along the height direction of the furnace 10, that is, the derotation device 40 is located above the burners 20 and the overburned air 30. The derotation device 40 has an air inlet 411 and an air outlet 412, wherein the air inlet 411 is arranged outside the furnace 10, and the air outlet 412 is arranged inside the furnace 10, and the direction of the air outlet 412 can be perpendicular to the height direction of the furnace 10, that is, the direction of the air outlet 412 can be in a plane perpendicular to the height direction of the furnace 10. External gas enters the decyclone device 40 through the air inlet 411 of the decyclone device 40 outside the furnace 10, and is discharged into the interior of the furnace 10 through the air outlet 412. The air outlet 412 can discharge air in a plane perpendicular to the height direction of the furnace 10. The gas at the air outlet 412 can convect with the rotating airflow above the burnout air 30 to decyclone the rotating airflow in the upper part of the furnace 10, reduce the rotational kinetic energy of the flow field in the upper part of the furnace 10, and make the rotating airflow in the upper part of the furnace 10 rise more slowly and gently to the top and the air outlet of the furnace 10, thereby preventing the upper part of the furnace 10 or the outlet 101 from having a larger amount of flue gas on one side and a smaller amount of flue gas on the other side, thereby avoiding overheating, coking or pipe bursting at the air outlet of the furnace 10, the inner wall of the upper part of the furnace 10 and the inner wall of the top of the furnace 10, thereby ensuring the normal operation of the boiler.

[0047] In some embodiments of the present invention, the de-cyclone device 40 includes: a de-cyclone air duct 41, an air inlet 411 and an air outlet 412 are both arranged in the de-cyclone air duct 41, and external gas enters the de-cyclone air duct 41 through the air inlet 411 of the de-cyclone air duct 41, and is discharged into the furnace 10 through the air outlet 412 of the de-cyclone air duct 41. The decyclone air duct 41 is rotatably connected to the furnace 10. The decyclone air duct 41 can rotate around its central axis. The central axis of the decyclone air duct 41 is perpendicular to the height direction of the furnace 10 to ensure that the rotating axis of the decyclone air duct 41 rotates perpendicular to the height direction of the furnace 10. As the decyclone air duct 41 rotates around its central axis, the air outlet 412 rotates together with the decyclone air duct 41. The air outlet 412 of the decyclone air duct 41 can be rotated to a plane perpendicular to the height direction of the furnace 10, so that the air outlet 412 of the decyclone air duct 41 forms convection with the rotating airflow in the furnace 10, thereby reducing the spiral kinetic energy of the flow field above the burnt air 30 in the furnace 10.

[0048] Furthermore, in order to ensure the de-cycloning effect of the de-cycloning device 40, the central axis of the de-cycloning air duct 41 passes through the center line of the furnace 10, or the extension line of the central axis of the de-cycloning air duct 41 passes through the center line of the furnace 10, so as to increase the contact area between the external gas at the air outlet 412 and the rotating airflow, thereby allowing more external gas to convect with the rotating airflow, thereby improving the de-cycloning capacity of the de-cycloning device 40.

[0049] The decyclone air duct 41 can rotate 360 ​​degrees around its central axis. According to the different requirements of different positions, the direction of the air outlet 412 of the corresponding decyclone air duct 41 can be adjusted to be perpendicular to the height direction of the furnace 10. The external gas can decyclone the original rotating airflow in the furnace 10 to the maximum extent through the air outlet 412.

[0050] When the air flow in the furnace 10 does not need to be decycloned, the direction of the air outlet 412 of the decyclone air duct 41 can be adjusted to be parallel to the height direction of the furnace 10 and downward, and the external gas passes through the air outlet to form a countercurrent mixture with the rising air 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 decyclone air duct 41 can be adjusted to be parallel to the height direction of the furnace 10 and upward, and the external gas is discharged into the furnace 10 through the air outlet, which can increase the center height of the flame in the furnace 10.

[0051] In some embodiments of the present invention, a plurality of air outlets 412 are provided on the decyclone air duct 41, and the plurality of air outlets 412 are arranged at intervals along the length direction of the decyclone air duct 41. The plurality of air outlets 412 can allow more external gas to convect with the rotating airflow in the furnace 10, thereby improving the decyclone capability of the decyclone device 40. Furthermore, the plurality of air outlets 412 are evenly arranged along the length direction of the decyclone air duct 41, ensuring that the external gas is evenly discharged into the interior of the furnace 10 through the plurality of air outlets 412 of the decyclone air duct 41, so that the rotating airflow in the furnace 10 is subjected to relatively uniform convection of the external gas, ensuring that the spiral kinetic energy of the rotating airflow in the furnace 10 is relatively uniform.

[0052] In some embodiments of the present invention, the multiple air outlets 412 have the same orientation to ensure that the multiple air outlets 412 can more concentratedly use all of the external air to counter the rotational kinetic energy of the rotating airflow, thereby improving the de-rotation capability of the de-rotation device 40 .

[0053] In some embodiments of the present invention, there are multiple decyclone air ducts 41, and multiple decyclone air ducts 41 can increase the convection area between the external gas and the rotating airflow in the furnace 10, so that the external gas at the air outlet 412 of the decyclone air duct 41 can offset more spiral kinetic energy, thereby improving the decyclone ability of the decyclone device 40. The multiple decyclone air ducts 41 are in the same plane, and the multiple decyclone air ducts 41 are spaced and evenly arranged, so that the furnace 10 is more evenly stressed.

[0054] At the same time, the decyclone air duct 41 can rotate 360 ​​degrees around its central axis, and multiple decyclone air ducts 41 can respectively achieve different rotation angles. According to different needs of different positions, the direction of the air outlet 412 of the corresponding decyclone air duct 41 can be adjusted to be perpendicular to the height direction of the furnace 10, and the external gas can decyclone the original rotating airflow in the furnace 10 to the maximum extent through the air outlet 412; or the direction of the air outlet 412 of the decyclone air duct 41 is adjusted to be parallel to the height direction of the furnace 10 and downward, and the external gas forms a countercurrent mixture with the rising airflow of the furnace 10 through the air outlet, 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 decyclone air duct 41 is adjusted to be parallel to the height direction of the furnace 10 and upward, and the external gas is discharged into the furnace 10 through the air outlet, which can increase the center height of the flame in the furnace 10. The decyclone air duct 41 can also be rotated to other angles according to specific needs. The working medium flow rate and rotation angle of each decyclone air duct 41 can be independently controlled, thereby realizing multiple coupling and optimal configuration of momentum and vector of the flow field in the furnace 10, and improving the flexibility and diversity of the flow field adjustment in the furnace.

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

[0056] In some embodiments of the present invention, the de-cyclone device 40 further includes: a suspension pipe 42, the suspension pipe 42 is connected to the furnace 10, one end of the de-cyclone air pipe 41 is rotatably connected to the side wall 11 of the furnace 10, and the other end of the de-cyclone air pipe 41 is rotatably connected to the suspension pipe 42. That is, the de-cyclone air pipe 41 is supported by the suspension pipe 42 connected to the furnace 10, so as to avoid the de-cyclone air pipe 41 from being offset in the furnace 10, thereby ensuring the de-cyclone ability of the de-cyclone air pipe 41.

[0057] In some embodiments of the present invention, the length direction of the suspension pipe 42 is the same as the height direction of the furnace 10 to ensure that the installation of the suspension pipe 42 does not affect the normal air discharge of the decyclone air pipe 41. The suspension pipe 42 is located at the center of the furnace 10, and the four decyclone air pipes 41 are rotatably connected to the suspension pipe 42 to ensure that the suspension pipe 42 is evenly stressed and the service life of the suspension pipe 42 is increased.

[0058] In some embodiments of the present invention, the suspension pipe 42 has a suspension inlet, a suspension outlet and a cooling channel, the cooling channel connects the suspension inlet and the suspension outlet, and the suspension inlet and the suspension outlet are both 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 prevent the suspension pipe 42 from being overheated by the hot air flow, slow down the fatigue time of the suspension pipe 42, and increase the service life of the suspension pipe 42. Specifically, the cooling medium can be water or water vapor.

[0059] In some embodiments of the present invention, the suspension tube 42 is rotatably connected to the plurality of de-cyclone air ducts 41 through a fixed bracket 43. Specifically, a suspension interface is provided on the fixed bracket 43, and the suspension tube 42 is fixedly connected to the suspension interface. The fixed bracket 43 is provided with a plurality of de-cyclone interfaces, four de-cyclone interfaces in this embodiment, and the four de-cyclone interfaces are rotatably connected to the four de-cyclone air ducts 41 respectively. The suspension interface is perpendicular to the four de-cyclone interfaces respectively, and two adjacent de-cyclone interfaces among the four de-cyclone interfaces are perpendicular. The reliability of the connection between the suspension tube 42 and the de-cyclone air duct 41 is achieved by the fixed bracket 43. At the same time, the fixed bracket 43 and the side wall 11 of the furnace 10 can ensure that the de-cyclone air duct 41 will not be displaced and can rotate.

[0060] In some embodiments of the present invention, the decyclone device 40 includes: a rotating handle 44, the rotating handle 44 is connected to the decyclone air duct 41, and the rotating handle 44 is arranged outside the furnace 10 in a rotatable manner relative to the furnace 10. The decyclone air duct 41 can be rotated by rotating the handle 44 to adjust the rotation angle of the decyclone air duct 41 to adapt to different air flow conditions in the furnace 10. Specifically, each decyclone air duct 41 is correspondingly provided with a rotating handle 44 to ensure that the rotation angle of each decyclone air duct 41 can be independently set. The rotating handle 44 can be a manually controlled handle or an electrically controlled handle.

[0061] In some embodiments of the present invention, the four-corner cut-circle boiler 100 with the furnace flow field derotation function also includes: a cooling component 50, which extends from the top of the furnace 10 to the inside of the furnace 10, and the high-temperature gas on the upper part and top of the furnace 10 is cooled by the cooling component 50 to reduce the damage of the high-temperature gas to the upper part, top and outlet 101 of the furnace 10, and reduce the problems of overheating, coking or pipe burst in the upper part, 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 overburnt air 30 and the cooling assembly 50, so as to derotate the airflow between the overburnt air 30 and the cooling assembly 50. Multiple groups of cooling assemblies 50 are evenly distributed in the furnace, and the airflow in the furnace 10 is cooled by the multiple groups of cooling assemblies 50 to improve the cooling effect.

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

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

[0065] 1) Before the boiler is ignited and started, water is supplied to the interior of the suspension pipe 42. The supplied water is supplied from the suspension inlet of the suspension pipe 42 and then discharged from the suspension outlet. The suspension pipe 42 is kept completely filled with water and a continuous and stable water flow is formed to start cooling the suspension pipe 42.

[0066] 2) Before the boiler is ignited and started, the directions of the de-cyclone nozzles of the four de-cyclone air ducts 41 are adjusted to be vertically downward by adjusting the rotating handle 44 of the de-cyclone air duct 41, and the positions are fixed;

[0067] 3) Before the boiler is ignited and started, air is supplied to the four de-cyclone air ducts 41. The supplied air enters the four de-cyclone air ducts 41 from the air inlets 411, is ejected from the nozzles of the de-cyclone air ducts 41, and enters the furnace 10. A relatively low air volume is maintained in the four de-cyclone air ducts 41, so that the de-cyclone air ducts 41 are cooled in advance.

[0068] 4) During the period from boiler ignition start to normal operation, gradually increase the water supply of the suspension pipe 42 to ensure that the suspension pipe 42 can be cooled normally, and gradually increase the air intake of the four de-cyclone air pipes 41 to ensure that the four de-cyclone air pipes 41 can be cooled normally;

[0069] 5) According to the combustion conditions in the boiler furnace, the air inlet volume in the four de-cyclone air ducts 41 is adjusted separately to control the air flow velocity and momentum of the de-cyclone nozzles on each de-cyclone air duct 41, so as to control the air flow rotation momentum in the area between the burnout air 30 and the cooling assembly 50;

[0070] 6) According to the combustion conditions in the boiler furnace, the airflow direction of the de-cyclone nozzle on each de-cyclone air duct 41 is controlled by adjusting the rotating handles 44 on the four de-cyclone air ducts 41 individually, so as to control the airflow rotation direction in the area between the burnout 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 in the area between the overburnt air 30 and the cooling assembly 50 is finally adjusted to the optimal state through multiple coupling adjustments in steps 5) and 6);

[0072] 8) If the device is shut down, the installation process 1) to 4) can be reversed.

[0073] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A four-corner tangential boiler with furnace flow field derotation function, characterized in that: The four-corner tangential boiler with furnace flow field derotation function comprises: furnace; Four groups of burners, the four groups of burners are respectively arranged at four corners of the furnace; Four groups of overburnt air, the four groups of overburnt air are respectively arranged at four corners of the furnace; The de-cyclone device is provided with the burner, the burnt air and the de-cyclone device in sequence from bottom to top along the height direction of the furnace. The de-cyclone device has an air inlet and an air outlet. The air inlet is provided on the outside of the furnace, and the air outlet is provided on the inside of the furnace. The direction of the air outlet can be perpendicular to the height direction of the furnace.

2. The tangentially-shaped boiler with furnace flow field derotation function according to claim 1 is characterized in that: The racemization device comprises: The decyclone air duct is rotatably connected to the furnace, the decyclone air duct can rotate around its central axis, the central axis of the decyclone air duct is perpendicular to the height direction of the furnace, the central axis of the decyclone air duct passes through the center line of the furnace, or the extension line of the central axis of the decyclone air duct passes through the center line of the furnace, and the air inlet and the air outlet are both arranged on the decyclone air duct.

3. The four-corner tangential boiler with furnace flow field derotation function according to claim 2 is characterized in that: The decyclone air duct is provided with a plurality of the air outlets, and the plurality of the air outlets are arranged at intervals along the length direction of the decyclone air duct.

4. The tangentially-shaped boiler with furnace flow field derotation function according to claim 2 is characterized in that: The directions of the plurality of air outlets are the same.

5. The tangentially-shaped boiler with furnace flow field derotation function according to claim 2, characterized in that: There are multiple decyclone air ducts, the multiple decyclone air ducts are in the same plane, and the multiple decyclone air ducts are spaced and evenly arranged.

6. The tangentially-shaped boiler with furnace flow field derotation function according to any one of claims 2 to 5, characterized in that: The racemization device also includes: A suspension pipe is connected to the furnace, one end of the decyclone air pipe is rotatably connected to the side wall of the furnace, and the other end of the decyclone air pipe is rotatably connected to the suspension pipe.

7. The tangentially-shaped boiler with furnace flow field derotation function according to claim 6, 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 at the center of the furnace.

8. The tangentially-shaped boiler with furnace flow field derotation function according to claim 6, characterized in that: The suspension pipe has a cooling inlet, a cooling outlet and a cooling channel, the cooling channel connects the cooling inlet and the cooling outlet, and the cooling inlet and the cooling outlet are both located outside the furnace.

9. The tangentially-shaped boiler with furnace flow field derotation function according to any one of claims 2 to 5, characterized in that: The racemization device comprises: A rotating handle is connected to the decyclone air duct, and the rotating handle is arranged outside the furnace in a rotatable manner relative to the furnace.

10. The tangentially-shaped boiler with furnace flow field derotation function according to claim 1, characterized in that: The four-corner tangential boiler with furnace flow field derotation function also includes: Multiple groups of cooling components, each of which extends from the top of the furnace to the inside of the furnace, along the height direction of the furnace, the cooling components are located above the air outlet, and multiple groups of cooling components are evenly distributed in the furnace.

Images