Over fire air adjusting device

Abstract

The utility model discloses an over fire air adjusting device. Wherein the over-fire air adjusting device is arranged above the primary air combustor, the over-fire air adjusting device is located on the outer side wall of the hearth, and the over-fire air adjusting device comprises a supporting frame, a primary air inlet and a secondary air outlet; the air outlet main body is arranged in the supporting frame, an air outlet of the air outlet main body is communicated with the hearth, and a baffle is arranged on an air inlet of the air outlet main body; and the adjusting module is connected with the baffle and drives the baffle to rotate. The over fire air adjusting device can adjust the angle of the air inlet baffle according to the change of the hearth wall temperature, so that the air quantity entering the air outlet main body is adjustable, the hearth wall temperature is adjusted, the use safety of the combustion boiler is guaranteed, immediate adjustment is achieved, the hearth temperature adjusting efficiency is improved, meanwhile, manual participation is reduced, and the working efficiency is improved. And the labor cost and the time cost are saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a power station boiler safety protection technical field especially relates to a burnout air adjusting device. BACKGROUND

[0002] The 600MW and above grade hedge combustion boiler because hearth size is big, the burner quantity is many, all exist the wall temperature distribution of different degrees uneven. The higher the wall temperature distribution uniformity of high temperature heating surface is, the higher the highest wall temperature is, and the serious even will exceed the alarm value. The heating surface overtemperature can lead to the oxidation skin of pipe inner wall, and the oxidation skin falls off under the condition that the wall temperature change rate is fast and is easy to cause the pipe blockage, even the pipe burst condition occurs. In recent years, the high efficiency parameter boiler (reheat steam temperature 623 DEG C boiler) that is put into operation often causes the heating surface wall temperature overtemperature and leads to the main steam temperature, the reheat steam temperature difficult to reach the rated value, and the unit economy is seriously restricted.

[0003] In the related art, the high temperature heating surface wall temperature leveling method is usually the optimization adjustment of the pulverizing system and the optimization adjustment of the burnout air. For the uneven wall temperature distribution caused by uneven distribution of coal powder, the optimization adjustment of the pulverizing system has good leveling effect. For the uneven wall temperature distribution caused by other reasons such as air distribution or coking, the optimization adjustment of the burnout air has good leveling effect. However, since it is manually adjusted, there are limitations: as the boundary conditions such as coal quality, load, mill combination and coking condition change, the high wall temperature area may shift. After the high wall temperature area shifts, the original pulverizing system operation mode and air distribution mode are no longer applicable, and need to be adjusted again, which wastes a lot of manpower and time. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at solving one of the technical problems in the prior art or related art.

[0005] Therefore, the utility model provides a burnout air adjusting device, wherein the burnout air adjusting device can adjust the angle of the air inlet baffle according to the change of the hearth wall temperature, so that the air volume entering the air outlet main body is adjustable, the adjustment of the hearth wall temperature is realized, the safety of the combustion boiler is ensured, the instant adjustment is realized, the efficiency of the hearth temperature adjustment is improved, the manual participation is reduced, and the labor cost and time cost are saved.

[0006] Specifically, the technical scheme comprises the following:

[0007] The utility model provides a burnout air adjusting device, the burnout air adjusting device sets up in the upper side of primary air burner, the burnout air adjusting device is located on the outside wall of hearth, the burnout air adjusting device includes:

[0008] Support frame

[0009] An air outlet body is installed inside the support frame. The air outlet of the air outlet body is connected to the furnace. A baffle is provided on the air inlet of the air outlet body.

[0010] An adjustment module is connected to the baffle, and the adjustment module drives the baffle to rotate;

[0011] The air inlet is provided with a frame, and a baffle is provided at one end of the frame away from the air inlet. The baffle is rotatable on the frame and includes a first baffle and a second baffle. The adjustment module drives the first baffle and the second baffle to rotate simultaneously.

[0012] Optionally, the air outlet body includes:

[0013] An internal secondary air duct is located at the center of the support frame, and the internal secondary air duct forms a direct airflow that is injected into the center of the furnace.

[0014] An external secondary air duct is fitted over the inner secondary air duct. The external secondary air duct is shaped like a frustum, with the small opening of the frustum located near the furnace side. The external secondary air duct forms a swirling airflow that mixes with the rising flue gas inside the furnace.

[0015] The air outlet is located at the end of the inner secondary air duct that is furthest from the outer secondary air duct.

[0016] Optionally, the adjustment module includes:

[0017] The drive shaft passes through the support frame and the frame and is fixedly connected to the first baffle.

[0018] A first actuator is located at the end of the drive shaft away from the first baffle.

[0019] A first linkage component is disposed within the frame. One end of the first linkage component is connected to the first baffle, and the other end of the first linkage component is connected to the second baffle. The first linkage component is disposed opposite to the first actuator.

[0020] Optionally, the first linkage component includes:

[0021] A first shaft is fixedly connected to the first baffle, and a first gear is provided on the first shaft;

[0022] The second shaft is fixedly connected to the second baffle, and a second gear is provided on the second shaft, which meshes with the first gear.

[0023] The first linkage component is disposed within the frame.

[0024] Optionally, the burnout air regulating device further includes:

[0025] A guide assembly is inserted into the air outlet of the air outlet body. The guide assembly includes a guide channel, and the diameter of the end of the guide channel away from the air outlet is smaller than the diameter of the air outlet.

[0026] Optionally, the guide component further includes:

[0027] A first wind vane and a second wind vane, at least a portion of the first wind vane and at least a portion of the second wind vane are disposed within the guide channel;

[0028] The second actuator is connected to the first wind vane and is located on the guide channel;

[0029] The second linkage component has one end connected to the first wind vane and the other end connected to the second wind vane. The second linkage component is positioned opposite to the second actuator.

[0030] Optionally, the second linkage component is disposed inside the housing, and the second linkage component includes:

[0031] The third shaft is connected to the first wind vane, and a third gear is provided on the third shaft;

[0032] The fourth shaft is connected to the second wind vane, and a fourth gear is provided on the fourth shaft;

[0033] A fifth shaft is located between the third and fourth shafts, and a fifth gear is provided on the fifth shaft. The third gear, the fifth gear, and the fourth gear mesh in sequence.

[0034] The burnout air regulating device provided in this embodiment includes an air outlet body with an air inlet and an air outlet. The air outlet is connected to the side wall of the furnace. A baffle is provided on the air inlet, which can rotate to adjust the size of the air inlet. An regulating module is connected to the baffle, and the rotation of the baffle is adjusted by the regulating module. This allows for real-time adjustment of the baffle, improving the efficiency of furnace temperature adjustment, reducing manual intervention, saving labor and time costs, and improving economic efficiency. The air outlet body is mounted on the outer wall of the furnace via a support frame, preventing direct stress on the air outlet body and extending its service life, thus extending the life of the burnout air regulating device.

[0035] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of a burnout air regulating device according to an embodiment of the present invention;

[0038] Figure 2 This is a front view of a burnout air regulating device according to an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of an adjustment module according to an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of a guide assembly according to an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of an optimized system according to an embodiment of the present invention.

[0042] in, Figures 1 to 5 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0043] 100 Burnout air regulating device, 110 Support frame, 111 First side plate, 112 Second side plate, 113 Connecting frame, 114 Reinforcing rib, 120 Air outlet body, 121 Inner secondary air duct, 122 Outer secondary air duct, 123 Frame, 124 First baffle, 125 Second baffle, 130 Adjustment module, 131 Drive shaft, 132 First actuator, 133 First linkage assembly, 1331 First shaft, 1332 First gear, 1333 Second shaft, 1334 Second gear, 140 Guide assembly Components: 141 Guide channel, 142 First wind vane, 143 Second wind vane, 144 Second actuator, 145 Second linkage assembly, 1451 Third shaft, 1452 Third gear, 1453 Fourth shaft, 1454 Fourth gear, 1455 Fifth shaft, 1456 Fifth gear, 200 Optimization system, 210 Data acquisition module, 220 Server, 221 Early warning server, 222 Optimization server, 230 Isolation gate, 240 Distributed control system, 250 PLC, 300 Combustion boiler. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0045] Before providing a further detailed description of the embodiments of this utility model, the directional terms used in the embodiments of this utility model, such as "upper part", "lower part" and "side part", do not have the meaning of limiting the scope of protection of this utility model.

[0046] To make the technical solution and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0047] Figure 1 This is a schematic diagram of a burnout air regulating device according to an embodiment of the present invention; Figure 2 This is a front view of a burnout air regulating device according to an embodiment of the present invention.

[0048] like Figure 1 and Figure 2 As shown, one embodiment of this utility model provides a burnout air regulating device 100, which is disposed above the primary air burner and located on the outer wall of the furnace. The burnout air regulating device 100 includes:

[0049] Support frame 110;

[0050] The air outlet body 120 is arranged in the support frame 110, the air outlet of the air outlet body 120 is communicated with the hearth, and the air inlet of the air outlet body 120 is provided with a baffle;

[0051] The adjusting module 130 is connected with the baffle, and the adjusting module 130 drives the baffle to rotate.

[0052] The overfire air adjusting device 100 comprises an air outlet body 120, the air outlet body 120 is provided with an air inlet and an air outlet, the air outlet is communicated with the side wall of the hearth, the baffle is arranged on the air inlet, the baffle can rotate on the air inlet, and the size of the air inlet can be adjusted, the adjusting module 130 is connected with the baffle, the rotation of the baffle is adjusted by the adjusting module 130, the baffle is adjusted by the adjusting module 130, the instant adjustment of the baffle is realized, the efficiency of the hearth temperature adjustment is improved, the manual participation is reduced, the labor cost and the time cost are saved, and the economy is improved. The air outlet body 120 is arranged on the outer side wall of the hearth through the support frame 110, the air outlet body 120 is avoided from being directly stressed, the service life of the air outlet body 120 is prolonged, that is, the service life of the overfire air adjusting device 100 is prolonged.

[0053] It can be understood that different numbers of overfire air adjusting devices 100 can be arranged on the hearth outer wall according to different types of combustion boilers. Generally, the combustion boiler has four hearth side walls, the overfire air adjusting device 100 can be arranged on any set of opposite hearth side walls, or one overfire air adjusting device 100 can be arranged on each of the four hearth side walls. When the combustion in the hearth is still not thorough enough, two overfire air adjusting devices 100 can be arranged in parallel in the height direction, and the overfire air adjusting device 100 can be arranged according to the needs of the combustion boiler.

[0054] In practice, the adjustment of the primary air burner is difficult, so the air inlet quantity of the overfire air is adjusted to change the side wall temperature of the furnace, avoid the high temperature of the side wall of the high temperature heating surface, ensure the uniformity of the side wall temperature distribution, and improve the use safety and operation reliability of the combustion boiler 300. Specifically, the support frame 110 includes oppositely arranged first and second side plates 111 and 112, which are connected together through a connecting frame 113 to form a whole, the first side plate 111 is a side plate fixedly connected with the side wall of the furnace, and the first side plate 111 is provided with a through hole, the air outlet of the air outlet body 120 passes through the hole and communicates with the furnace, and the air inlet of the air outlet body 120 is arranged between the first and second side plates 111 and 112, and the air inlet is arranged as far away from the air outlet as possible to improve the uniformity of the air inlet. The support frame 110 can avoid the direct force of the air outlet body 120, and ensure the reliability of the operation of the air outlet body 120. The baffle is arranged on the air inlet, the angle between the baffle and the air inlet is adjusted by the adjusting module, and then the adjustment of the angle of the air inlet is realized. When the temperature of the side wall of the furnace is lower than the lowest temperature value in the safe range, the adjusting module 130 can be controlled to work, and then the baffle is driven to rotate, so that the air inlet is enlarged, the air inlet quantity is increased, and then the combustion in the furnace is improved, and the temperature of the side wall of the furnace is increased. When the temperature of the side wall of the furnace is higher than the highest value in the safe range, the adjusting module 130 can also be controlled to work, and then the baffle is driven to rotate in the opposite direction, so that the air inlet is reduced, the air inlet quantity is reduced, and then the combustion degree in the furnace is reduced, and the temperature of the side wall of the furnace is reduced until the temperature of the side wall of the furnace returns to the safe range.

[0055] It should be noted that when the temperature of the side wall of the furnace is in the safe range, the angle of the baffle can be maintained at the same angle to avoid repeated rotation of the baffle. It can be understood that a plurality of temperature sensors can be arranged on the high temperature heating surface of the side wall of the furnace, and the average value of the plurality of temperature sensors is compared with the safe range, so that the repeated rotation of the baffle can be avoided, and the vibration affecting the normal work of the combustion boiler can be avoided.

[0056] In a feasible implementation, the air outlet body 120 includes:

[0057] The inner secondary air duct 121 is arranged at the center position of the support frame 110, and the inner secondary air duct 121 forms a straight flow of air jet into the center of the furnace;

[0058] The outer secondary air duct 122 is sleeved on the inner secondary air duct 121, and the outer secondary air duct 122 is in the shape of a circular truncated cone, the small end of the circular truncated cone is arranged close to one side of the furnace, and the outer secondary air duct 1022 forms a rotational flow of air mixed with the rising flue gas in the furnace;

[0059] The air outlet is arranged at one end of the inner secondary air duct 121 away from the outer secondary air duct 122.

[0060] It should be noted that the overfire air adjusting device 100 is divided into two air flows which are injected into the furnace, the air flow in the middle is the straight flow air flow injected by the inner secondary air duct 121, the straight flow air flow has the characteristics of high speed and large rigidity, and can directly penetrate the ascending flue gas to enter the center of the furnace, the outer secondary air duct 122 located outside the inner secondary air duct 121 is in the shape of a circular table, forming a rotational flow, and the rotational flow is diffused to the four directions when leaving the outer secondary air duct 122, and is used for mixing with the ascending flue gas near the water-cooled wall of the furnace, so that the air flow entering the furnace is mainly controlled by adjusting the flow of the inner secondary air, and then the side wall temperature of the furnace is adjusted, that is, the side wall temperature of the furnace can be adjusted by adjusting the air flow of the inner secondary air duct 121.

[0061] In a feasible implementation, a frame 123 is arranged on the air inlet, a baffle is arranged on the end of the frame 123 away from the air inlet, the baffle can rotate on the frame 123, the baffle includes a first baffle 124 and a second baffle 125, and the adjusting module 130 drives the first baffle 124 and the second baffle 125 to rotate simultaneously.

[0062] In a feasible implementation, a frame 123 is arranged on the air inlet, a baffle is arranged on the end of the frame 123 away from the air inlet, the baffle can rotate on the frame 123, the baffle includes a first baffle 124 and a second baffle 125, and the adjusting module 130 drives the first baffle 124 and the second baffle 125 to rotate simultaneously.

[0063] It can be understood that when the first baffle 124 and the second baffle 125 are parallel to the height direction of the frame 123, the air inlet is the largest, and the first baffle 124 and the second baffle 125 are usually arranged in the initial position perpendicular to the height direction of the frame 123, and at this time, the air inlet is the smallest.

[0064] Figure 3 A schematic view of the adjusting module according to an embodiment of the present application.

[0065] In a feasible implementation, as shown in Figure 3 the adjusting module 130 includes:

[0066] a driving shaft 131 fixedly connected with the first baffle 124 through the support frame 110 and the frame 123;

[0067] a first actuator 132 arranged at the end of the driving shaft 131 away from the first baffle 124;

[0068] a first linkage assembly 133 arranged in the frame 123, one end of the first linkage assembly 133 is connected with the first baffle 124, the other end of the first linkage assembly 133 is connected with the second baffle 125, and the first linkage assembly 133 is arranged opposite to the first actuator 132.

[0069] In order to ensure the simplicity of the overfire air adjusting device 100, the first baffle 124 and the second baffle 125 are usually rotated simultaneously by one actuator, and therefore the first linkage assembly 133 is provided, the first baffle 124 is driven to rotate by the first actuator 132, and the second baffle 125 is driven to rotate in the opposite direction of the first baffle 124 by the first linkage assembly 133, that is, when we face the second side plate 112 of the support frame 110, the first baffle 124 rotates counterclockwise, and the second baffle 125 rotates clockwise; the first baffle 124 rotates clockwise, and the second baffle 125 rotates counterclockwise, so that the size of the air inlet can be adjusted by the rotation of the first baffle 124 and the second baffle 125. It can be understood that if the first baffle 124 and the second baffle 125 rotate in the same direction, the size of the air inlet is basically the same, and the purpose of adjusting the size of the air inlet cannot be achieved.

[0070] It can be understood that the first actuator 132 is usually a motor, which receives the control instructions of the PLC 250 to realize the instructions of starting or stopping, forward rotation or reverse rotation, and drives the first baffle 124 to rotate through the connection shaft of the first actuator 132 and the driving shaft 131, and the driving shaft 131 is fixedly connected with the first baffle 124, that is, the first actuator 132 drives the first baffle 124 to rotate to adjust the size of the air inlet.

[0071] In a possible implementation, the first linkage assembly 133 comprises:

[0072] The first shaft 1331 is fixedly connected with the first baffle 124, and the first gear 1332 is arranged on the first shaft 1331;

[0073] The second shaft 1333 is fixedly connected with the second baffle 1333, the second gear 1334 is arranged on the second shaft 1333, and the second gear 1334 is engaged with the first gear 1332;

[0074] The first linkage assembly is arranged in the frame.

[0075] It should be noted that the first linkage assembly 133 is arranged opposite to the first actuator 132, and the first linkage assembly 133 is located in the frame 123. The first shaft 1331 is fixed with the first baffle 124, and the first shaft 1331 is arranged opposite to the driving shaft 131. The first actuator 132 drives the driving shaft 131, the first baffle 124 and the first shaft 1331 to rotate in sequence, so that the first gear 1332 on the first shaft 1331 rotates with the first shaft 1331. The first gear 1332 is engaged with the second gear 1334, so that the second gear 1334 is driven to rotate. The rotation directions of the first gear 1332 and the second gear 1334 are opposite, and the rotation of the second gear 1334 drives the second shaft 1333 and the second baffle 125 to rotate in sequence. Since the rotation directions of the first gear 1332 and the second gear 1334 are opposite, the rotation directions of the first shaft 1331 and the second shaft 1333 are opposite, so that the rotation angles of the first baffle 124 and the second baffle 125 are opposite, the first baffle 124 and the second baffle 125 are driven to rotate in linkage, and the angle of the air inlet is adjusted.

[0076] It can be understood that if the diameter of the gear is to be reduced, an even number of connecting shafts can be arranged between the first shaft 1331 and the second shaft 1333, and a gear is arranged on each connecting shaft. The first gear 1332, the even number of intermediate gears and the second gear 1334 are engaged in sequence, as long as the reverse rotation of the first baffle 124 and the second baffle 125 can be realized.

[0077] The burnout air adjusting device 100 of the present example has simple structure and high reliability, is not prone to jamming, has good air inlet adjustment effect, can realize independent adjustment of the air inlets of the inner secondary air ducts 121 of multiple burnout air adjusting devices 100, can control the air inlets of the burnout air adjusting devices 100 at different positions according to different furnace side wall temperatures, and can more accurately adjust the temperature of the furnace side wall.

[0078] Figure 4 A schematic view of a guide assembly according to an embodiment of the present application.

[0079] In a possible implementation manner, as shown in Figure 4 The burnout air adjusting device 100 further comprises:

[0080] The guide assembly 140 is inserted into the air outlet of the air outlet body 120, and the guide assembly 140 comprises a guide channel 141. The diameter of the guide channel 141 at an end away from the air outlet is smaller than the diameter of the air outlet.

[0081] The guide assembly 140 can be arranged at the air outlet of the air outlet body 120, and the guide assembly 140 reduces the diameter of the original air outlet. It can be understood that, under the premise of constant air inlet, reducing the area of the air outlet can increase the pressure per unit area, thereby increasing the rigidity of the air outlet of the inner secondary air duct 121, and further ensuring that the air (straight flow) sprayed by the inner secondary air duct 121 can directly penetrate the rising flue gas and enter the center of the furnace. The diameter of the guide channel 141 at the end away from the air outlet is smaller than the diameter of the air outlet, that is, the size of the guide channel 141 gradually decreases from one end of the air outlet to the end away from the air outlet.

[0082] It should be noted that the guide assembly 140 and the inner secondary air duct 121 can be connected by threads, and an inner thread or an outer thread is arranged at the end of the guide assembly 140 close to the inner secondary air duct 121, and a corresponding outer thread or inner thread is arranged at the end of the inner secondary air duct 121 close to the guide assembly 140. The connection between the inner secondary air duct 121 and the guide assembly 140 can also be achieved by bolts and / or screws. The guide assembly 140 can be sleeved on the inner secondary air duct 121 or embedded in the inner secondary air duct 121. In this embodiment, the connection is of the embedded type. The diameter of the end of the guide assembly 140 away from the inner secondary air duct 121 is smaller than the diameter of the air outlet of the inner secondary air duct 121. The connection between the two ends of the guide assembly 140 can be achieved by a smooth side wall or a side wall formed by a free curve.

[0083] In a feasible implementation, the guide assembly 140 further comprises:

[0084] The first air direction plate 142 and the second air direction plate 143 are arranged at least partially in the guide channel 141.

[0085] The second actuator 144 is connected to the first air direction plate 142, and the second actuator 144 is located on the guide channel 141.

[0086] The second linkage assembly 145 is connected at one end to the first air direction plate 142 and at the other end to the second air direction plate 143, and the second linkage assembly 145 is arranged opposite to the second actuator 144.

[0087] The guide assembly 140 can also control the direction of the air in the inner secondary air duct 121, so that when the wall temperature of the furnace side wall is too high, the direction of the guide assembly 140 can be adjusted to change the spraying direction of the straight flow in the inner secondary air duct 121, that is, the straight flow is not directly sprayed to the center of the furnace, but sprayed to a position other than the center of the furnace, or even towards the furnace side wall, so as to slow down the combustion speed in the furnace and achieve the purpose of cooling the furnace side wall.

[0088] Specifically, the first air direction plate 142 and the second air direction plate 143 can be arranged in the guide channel 141. In order to ensure the rigidity of the air flow of the inner secondary air duct 121, at least part of the first air direction plate 142 and at least part of the second air direction plate 143 are arranged in the guide channel 141, and the first air direction plate 142 and the second air direction plate 143 are arranged in parallel. The second actuator 144 is usually a motor, the output shaft of the motor is fixedly connected with the first air direction plate 142, the first air direction plate 142 is driven to rotate by the first actuator 144, in order to ensure that the first air direction plate 142 and the second air direction plate 143 always maintain a state of being substantially parallel, a second linkage assembly 145 is arranged between the first air direction plate 142 and the second air direction plate 143, so that the rotation of the first air direction plate 142 drives the same-direction rotation of the second air direction plate 143, so as to realize the change of the air outlet angle. Wherein, the substantially parallel arrangement refers to that the included angle between the first air direction plate 142 and the second air direction plate 143 is 0° to ±1°.

[0089] It should be noted that a corrugated pipe can also be arranged at the end of the guide channel 141 away from the inner secondary air duct 121, and a telescopic rod is arranged at the same time, the telescopic end of the telescopic rod is hinged to the corrugated pipe, the fixed end of the telescopic rod is hinged to the guide channel 141, and the direction of the air flow in the corrugated pipe is changed by controlling the telescopic rod to realize the change of the direction of the straight air flow in the inner secondary air duct 121.

[0090] In a feasible implementation, the second linkage assembly 145 is arranged in the box body, and the second linkage assembly 145 comprises:

[0091] The third shaft 1451 is connected with the first air direction plate 142, and the third shaft 1451 is provided with the third gear 1452;

[0092] The fourth shaft 1453 is connected with the second air direction plate 143, and the fourth shaft 1453 is provided with the fourth gear 1454;

[0093] The fifth shaft 1455 is arranged between the third shaft 1451 and the fourth shaft 1453, the fifth shaft 1455 is provided with the fifth gear 1456, and the third gear 1452, the fifth gear 1456 and the fourth gear 1454 are sequentially meshed.

[0094] The second executor 144 can be arranged above the guide channel 141, and the second linkage assembly 145 can be arranged in a box below the guide channel 141. Specifically, the box is provided with a third shaft 1451, a fourth shaft 1453 and a fifth shaft 1455. The third shaft 1451 is fixedly connected with the first wind direction plate 142, and the third shaft 1451 is provided with a third gear 1452. The second executor 144 drives the second wind direction plate 142 to rotate, and then drives the third shaft 1451 and the third gear 1452 thereon to rotate. The fourth shaft 1453 is fixedly connected with the second wind direction plate 143, and the fourth shaft 1453 is provided with a fourth gear 1454. In order to ensure the same direction rotation of the first wind direction plate 142 and the second wind direction plate 143, the fifth gear 1456 is arranged between the third gear 1452 and the fourth gear 1454, and the fifth gear 1456 is supported by the fifth shaft 1455, and the third gear 1452, the fifth gear 1456 and the fourth gear 1454 are sequentially engaged. Through the transition of the fifth gear 1456, the same direction rotation of the third gear 1452 and the fourth gear 1454 is realized, and then the same direction rotation of the second wind direction plate 143 and the first wind direction plate 142 is realized, so as to ensure the parallelism of the first wind direction plate 142 and the second wind direction plate 143, and then ensure the rigidity of the airflow ejected from the inner secondary air duct 121, so that the airflow can be directly ejected to the center of the hearth when the guide assembly 140 is in the initial position.

[0095] It can be understood that the third shaft 1451, the fourth shaft 1453 and the fifth shaft 1455 are rotationally connected with the box.

[0096] Figure 5 A schematic view of an optimization system according to an embodiment of the present application.

[0097] As shown in Figure 5 Another embodiment of the present application provides a boiler heating surface over-temperature optimization system. The optimization system 200 comprises:

[0098] The over-fire air adjusting device 100 according to any one of the above embodiments comprises a baffle arranged at the air inlet and an adjusting module 130 for adjusting the angle of the baffle;

[0099] The collecting module 210 collects the combustion information of the hearth;

[0100] The server 220 receives the combustion information, calculates according to the combustion information, and obtains the set opening and closing angle of the baffle;

[0101] The distributed control system 240 receives the set opening and closing angle and controls the adjusting module 130 so that the baffle meets the set opening and closing angle.

[0102] The collection module 210 is a DAS (Data Acquisition System) of the power plant, which collects the combustion information of the furnace, i.e. the combustion information of the high-temperature heating surface of the furnace, such as heat load, steam temperature, steam pressure, pipe wall temperature, etc. A plurality of sensors for monitoring pressure and temperature are arranged at a plurality of high-temperature heating surfaces. The values of the sensors are collected by the DAS and transmitted to the server 220. In the server 220, the temperature threshold is obtained by combining the smoke temperature deviation of the high-temperature heating surface and the pipe material over-temperature condition and performing fuzzy processing. The temperature threshold is uploaded to the distributed control system 240 (DCS). The working instructions obtained by the distributed control system 240 are transmitted to the PLC 250 of the burnout air adjusting device 100, and the first actuator 132 is controlled by the PLC 250. When the detected temperature exceeds the temperature threshold, the degree of combustion needs to be reduced, so the airflow entering the furnace is reduced, i.e. the angle of the first baffle 124 and the second baffle 125 is reduced. When the detected temperature is lower than the temperature threshold, the degree of combustion needs to be increased, so the airflow entering the furnace is increased, i.e. the angle of the first baffle 124 and the second baffle 125 is increased. When the detected temperature is within the temperature threshold, the angle of the first baffle 124 and the second baffle 125 remains unchanged. At the same time, the temperature can be reduced by changing the direction of the guide assembly 140. When the detected temperature is too high, the wind direction plate of the air outlet can be controlled to deviate from the center of the furnace and face the side wall with higher wall temperature. When the temperature is too low, the wind direction plate of the air outlet can be controlled to align with the center of the furnace and actively participate in combustion.

[0103] The fuzzy processing is to obtain a temperature threshold. Within the temperature range, the opening angle of the air inlet can remain unchanged, avoiding frequent rotation of the first baffle 124 and the second baffle 125, which affects the normal work of the burnout air adjusting device.

[0104] In a feasible implementation, the server 220 includes a warning server 221 and an optimization server 222. The warning server 221 receives the combustion information, compares the combustion information with the set parameters, and transmits the signal and the combustion data to the optimization server 222 when the combustion information exceeds the threshold of the set parameters. The optimization server 222 calculates the set opening and closing angle according to the combustion data.

[0105] The distributed control system 240 is also used to receive the current of the adjusting module 130 and the angle of the baffle, and control whether the adjusting module 130 is turned on according to the current 130 and the angle in combination with the set opening and closing angle.

[0106] For the data collection of the high-temperature heating surface, the temperature collection at the locations of the screen superheater, the last-stage superheater and the last-stage reheater can be included to realize the over-temperature early warning monitoring of the high-temperature heating surface. The security of data transmission can be ensured by installing an isolation gateway 230 between the optimization server 222 and the distributed control system 240 (DCS), so as to avoid external intrusion and cause the optimization system 200 to be unable to work normally.

[0107] It should be noted that in the working configuration, the DCS also receives the current of the first actuator 132, the angles of the first baffle 124 and the second baffle 125. If the current value and the angle value reach the limit value, the DCS does not issue an instruction to the PLC 250, so as to avoid the first actuator 132 and the baffle from being damaged due to the continuous control of the PLC 250 on the working of the first actuator 132. Similarly, the DCS also receives the current of the second actuator 144, the angles of the first wind direction plate 142 and the second wind direction plate 143. If the current value and the angle value reach the limit value, the DCS does not issue an instruction to the PLC 250, so as to avoid the second actuator 144 and the wind direction plate from being damaged due to the continuous control of the PLC 250 on the working of the second actuator 144. It can be understood that the current value and the angle limit value are a known parameter at the time of factory shipment.

[0108] In the embodiment, the server 220 includes the early warning server 221 and the optimization server 222. According to the wall temperature measuring points of the high-temperature heating surface of the combustion boiler 300, the over-temperature early warning of the high-temperature heating surface is realized in combination with the threshold of the wall temperature measuring points. After the early warning occurs, the PLC 250 controls the first actuator 132 and the second actuator 144 to work according to the requirements. The accuracy of the optimization of the high-temperature heating surface can be realized by the timely temperature change in combination with the position of the over-fired air adjusting device 100, and the application is wide. It can be understood that the calculation inside each system is not within the protection scope of the present application, and will not be repeated here.

[0109] In the present application, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. The term "a plurality of" means two or more, unless otherwise explicitly limited.

[0110] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The present application is intended to cover any variations, uses or adaptive changes of the present application following the general principles of the present application and including common knowledge or conventional technical means in the art not disclosed in the present application. The specification and examples are only considered as exemplary.

[0111] The above merely is the preferred embodiment of the present application, and does not limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An overfire air adjustment device disposed above a primary air burner, the overfire air adjustment device located on an outer sidewall of a furnace, characterized by, The overfire air adjusting device comprises: a support frame; an air outlet body arranged in the support frame, an air inlet of the air outlet body being provided with a baffle plate; an adjusting module connected with the baffle plate, the adjusting module driving the baffle plate to rotate; a frame is arranged on the air inlet, a baffle plate is arranged on an end of the frame away from the air inlet, the baffle plate being capable of rotating on the frame, the baffle plate comprising a first baffle plate and a second baffle plate, the adjusting module simultaneously driving the first baffle plate and the second baffle plate to rotate.

2. The overfire air adjustment device of claim 1, wherein, The air outlet body comprises: an inner secondary air duct arranged at a central position of the support frame, the inner secondary air duct forming a straight-flow air jet into a center of the furnace; an outer secondary air duct sleeved on the inner secondary air duct, the outer secondary air duct being in the shape of a circular truncated cone, a small opening end of the circular truncated cone being arranged close to a side of the furnace, the outer secondary air duct forming a rotational-flow air jet mixed with the ascending flue gas in the furnace; wherein, the air outlet is arranged at an end of the inner secondary air duct away from the outer secondary air duct.

3. The overfire air adjustment device of claim 1, wherein, The adjusting module comprises: a driving shaft fixedly connected with the first baffle plate through the support frame and the frame; a first actuator arranged at an end of the driving shaft away from the first baffle plate; a first linkage assembly arranged in the frame, one end of the first linkage assembly being connected with the first baffle plate, the other end of the first linkage assembly being connected with the second baffle plate, the first linkage assembly being oppositely arranged with the first actuator.

4. The overfire air adjustment device of claim 3, wherein, The first linkage assembly comprises: a first shaft fixedly connected with the first baffle plate, the first shaft being provided with a first gear; a second shaft fixedly connected with the second baffle plate, the second shaft being provided with a second gear, the second gear being engaged with the first gear; wherein, the first linkage assembly is arranged in the frame.

5. The overfire air adjustment device of claim 1, wherein, The overfire air adjusting device further comprises: a guide assembly inserted into the air outlet of the air outlet body, the guide assembly comprising a guide channel, a diameter of an end of the guide channel away from the air outlet being smaller than a diameter of the air outlet.

6. The overfire air adjustment device of claim 5, wherein, The guide assembly further comprises: a first air direction plate and a second air direction plate, at least part of the first air direction plate and at least part of the second air direction plate being arranged in the guide channel; a second actuator connected with the first air direction plate, the second actuator being arranged on the guide channel; a second linkage assembly, one end of the second linkage assembly being connected with the first air direction plate, the other end of the second linkage assembly being connected with the second air direction plate, the second linkage assembly being oppositely arranged with the second actuator.

7. The overfire air adjustment device of claim 6, wherein, The second linkage assembly is arranged in a box body, the second linkage assembly comprising: a third shaft connected with the first air direction plate, the third shaft being provided with a third gear; a fourth shaft connected with the second air direction plate, the fourth shaft being provided with a fourth gear; a fifth shaft arranged between the third shaft and the fourth shaft, the fifth shaft being provided with a fifth gear, the third gear, the fifth gear and the fourth gear being engaged in sequence.

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