Anti-clogging flue gas transfer devices and boiler equipment

Abstract

The present invention discloses an anti-clogging flue gas transfer device and boiler equipment. The anti-clogging flue gas transfer device includes a branch flue pipe, a switch mechanism and an anti-clogging mechanism; the branch flue pipe includes a first end and a second end, the first end is connected to the medium-temperature section economizer and communicated with the economizer outlet pipe of the medium-temperature section economizer, the second end is connected to the low-temperature section air preheater and communicated with the low-temperature section air preheater, the switch mechanism is connected to the first end for opening or closing the branch flue pipe, the anti-clogging mechanism includes a blowing nozzle, the blowing nozzle is connected to the branch flue pipe and close to the second end, the blowing nozzle is used to blow air into the branch flue pipe. The anti-clogging flue gas transfer device can effectively reduce the heat loss of boiler exhaust, improve the thermal efficiency of the boiler, and prevent the pipe from being blocked by ammonium bisulfate crystals.

Description

Technical Field

[0001] The invention relates to the field of boilers in thermal power plants, and in particular to an anti-blocking flue gas transfer device and boiler equipment. Background Art

[0002] With the improvement of national environmental protection emission standards, the emission standards of flue gas pollutants in the thermal power generation industry have also been improved. Many boilers use SNCR technology (Selective Non-Catalytic Reduction) to reduce the emission of nitrogen oxides in flue gas, that is, using amino-containing reducing agents (such as ammonia water, urea solution, etc.) to spray into the furnace, and reduce nitrogen oxides (NO X ) is reduced and removed to generate nitrogen (N 2 ) and water (H 2 O).

[0003] The flue gas flow of the existing boiler is as follows: the flue gas generated by the boiler passes through the high-temperature superheater, low-temperature superheater, high-temperature economizer, medium-temperature economizer, low-temperature economizer, high-temperature air preheater, medium-temperature air preheater, and finally enters the low-temperature air preheater. When ammonia water is used as a reducing agent and sprayed into the furnace for reaction, ammonium bisulfate (NH4HSO 4 ). Ammonium bisulfate (NH4HSO 4 ) has a melting point of 147°C and is easy to crystallize at low temperatures. When the flue gas passes through the superheater, economizer, high-temperature air preheater, and medium-temperature air preheater, the flue gas needs to exchange heat with the superheater, economizer, high-temperature air preheater, and medium-temperature air preheater, causing the temperature of the flue gas to drop below 135°C when it enters the low-temperature air preheater. Therefore, ammonium bisulfate in the flue gas is easy to crystallize and block the flue gas side pipe of the low-temperature air preheater, resulting in a decrease in the heat exchange efficiency of the low-temperature air preheater. At the same time, it affects the balance of boiler smoke and wind, causing the negative pressure at the boiler furnace outlet to decrease or become positive pressure, resulting in a decrease in the boiler's load capacity. The reduction in the heat exchange efficiency of the air preheater will increase the heat loss of the boiler exhaust and reduce the thermal efficiency of the boiler. Summary of the invention

[0004] Based on this, it is necessary to provide an anti-clogging flue gas transfer device and boiler equipment that can effectively reduce boiler exhaust heat loss, improve boiler thermal efficiency, and prevent pipelines from being blocked by ammonium bisulfate crystals.

[0005] A blockage-resistant flue gas transfer device comprises a branch flue pipe, a switch mechanism and an anti-blockage mechanism; the branch flue pipe comprises a first end and a second end, the first end is used to be connected to a medium-temperature section economizer and communicated with the economizer outlet pipe of the medium-temperature section economizer, the second end is used to be connected to a low-temperature section air preheater and communicated with the low-temperature section air preheater, the switch mechanism is connected to the first end to open or close the branch flue pipe, the anti-blockage mechanism comprises a blowing nozzle, the blowing nozzle is connected to the branch flue pipe and is close to the second end, the blowing nozzle is used to blow air into the branch flue pipe.

[0006] In one embodiment, the switch mechanism includes a switch gate, a lock and a locking member. The switch gate can be rotatably connected to the inner wall of the first end, and the lock is fixedly connected to the inner wall of the second end. The switch gate and the lock are arranged in relative positions, and the locking member is connected to the switch gate. When the switch gate is rotated to close the branch flue pipe, the locking member can be locked with the lock.

[0007] In one embodiment, the rotation angle range of the switch gate is 0-90°, and the switch gate coincides with the radial surface of the branch flue pipe when the switch gate is reset. The switch gate can be rotated 90° to fully open the branch flue pipe.

[0008] In one embodiment, the switch mechanism further includes a drive motor, the drive motor is electrically connected to a rotating shaft of the switch gate, and the drive motor is used to drive the switch gate to rotate.

[0009] In one embodiment, the anti-blocking mechanism further includes a flow guide tube, and the flow guide tube is connected to the blowing nozzle.

[0010] In one of the embodiments, the anti-blocking mechanism further includes a blowing pipe, the blowing pipe is connected to the outside of the branch flue pipe, the guide pipe is connected to a plurality of the blowing nozzles arranged at intervals, and the blowing pipe is connected to the guide pipe.

[0011] In one of the embodiments, a plurality of the blowing nozzles are arranged at equal intervals on the flow guide tube.

[0012] In one of the embodiments, the branch flue pipe is a flat structure, and a plurality of the blowing nozzles are extended and distributed in the width direction of the radial surface of the branch flue pipe.

[0013] In one of the embodiments, it further comprises reinforcing ribs, at least one of which is disposed in the branch flue pipe, and the reinforcing ribs extend along the axial direction of the branch flue pipe.

[0014] In one of the embodiments, the branch flue pipe includes a plurality of sub-pipes, the plurality of sub-pipes are connected in sequence, and at least one group of adjacent sub-pipes is connected with an expansion joint.

[0015] A boiler equipment comprises a boiler main body system and the anti-clogging flue gas transfer device, wherein the anti-clogging flue gas transfer device is connected between the medium-temperature section economizer and the low-temperature section air preheater of the boiler main body system, the first end of the branch flue pipe is connected to the medium-temperature section economizer and communicates with the medium-temperature section economizer, and the second end of the branch flue pipe is connected to the low-temperature section air preheater and communicates with the low-temperature section air preheater.

[0016] The above-mentioned anti-clogging flue gas transfer device can effectively reduce the heat loss of boiler exhaust gas, improve the thermal efficiency of the boiler, and prevent the pipeline from being blocked by ammonium bisulfate crystals. The boiler equipment is operating normally, and the above-mentioned device is not put into operation. When it is found that the outlet flue gas temperature of the low-temperature air preheater rises, the outlet air temperature of the boiler primary air and the boiler secondary air of the air preheater decreases, and the upper limit of the air volume of the boiler primary air and the boiler secondary air decreases significantly, it means that the pipeline between the low-temperature air preheater and the medium-temperature economizer is blocked. At this time, first open the anti-blockage mechanism of the anti-blockage flue gas transfer device. The anti-blockage mechanism blows air into the branch flue pipe through the blowing nozzle to fluidize the smoke and dust accumulated in the branch flue pipe (when the anti-blockage flue gas transfer device is not in use, since the branch flue pipe is in a one-way closed state, the smoke and dust in the low-temperature section air preheater will slowly enter the branch flue pipe and form accumulation). Secondly, slowly open the switch mechanism and observe the outlet flue gas temperature of the low-temperature section air preheater. If the temperature rises, it indicates that the anti-blockage flue gas transfer device is operating normally. Finally, adjust the opening of the switch mechanism to control the outlet flue gas temperature between 180℃-200℃, and the anti-blockage flue gas transfer device should run for at least 12 hours.

[0017] The above-mentioned anti-blocking flue gas transfer device is provided with a switch gate for opening or closing the branch flue pipe. The switch gate is set in the same shape and size as the radial surface of the branch flue pipe, and the switch gate can rotate 90°. When normally closed, the switch gate is located on the radial surface of the branch flue pipe, and the switch gate can be engaged and closed by the locking member and the lock buckle at the relative position; when fully open, the switch gate rotates 90° to realize the full opening of the branch flue pipe, and all the flue gas passes through the branch flue pipe. When the switch mechanism opens the branch flue pipe, the switch mechanism simultaneously closes the outlet pipe of the medium temperature section economizer.

[0018] The above-mentioned anti-clogging smoke transfer device is provided with a driving motor, and the driving motor is electrically connected to the switch gate. The driving motor can be connected to the control system to realize remote control of the switch gate.

[0019] The anti-clogging smoke transfer device is provided with a blowing pipe and blows air through a blowing nozzle, and the blowing of the blowing nozzle can fluidize the smoke and dust accumulated in the branch flue pipe.

[0020] The above-mentioned anti-clogging smoke transfer device is provided with a guide pipe to cooperate with multiple blowing nozzles. The airflow in the blowing pipe is evenly dispersed through the guide pipe, and the dispersed airflow is blown out through multiple spaced blowing nozzles, which can realize multi-angle fluidization of smoke and dust accumulated in the branch flue pipe.

[0021] The multiple blowing nozzles of the above-mentioned anti-clogging smoke transfer device are arranged at equal intervals on the guide pipe, which can fluidize the smoke and dust accumulated in the branch flue pipe at multiple angles.

[0022] The anti-clogging flue gas transfer device mentioned above improves the strength of the branch flue pipe by arranging reinforcing ribs.

[0023] The above-mentioned anti-clogging flue gas transfer device facilitates the installation and disassembly of the branch flue pipe by arranging multiple sub-pipes, and an expansion joint is connected between at least one group of adjacent sub-pipes to adapt to the deformation of the sub-pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a side schematic diagram of an anti-clogging smoke transport device according to an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of a switch mechanism of an anti-clogging smoke transport device according to an embodiment of the present invention;

[0026] Figure 3 This is a front schematic diagram of an anti-clogging smoke transport device according to an embodiment of the present invention;

[0027] Figure 4 It is a front schematic diagram of the anti-clogging mechanism of the anti-clogging smoke transport device according to one embodiment of the present invention.

[0028] Description of Reference Numerals

[0029] 10. Anti-clogging flue gas transfer device; 100. Branch flue pipe; 110. First end; 120. Second end; 130. Sub-pipe; 200. Switch mechanism; 210. Switch gate; 220. Lock; 230. Locking member; 300. Anti-clogging mechanism; 310. Blowing nozzle; 320. Blowing pipe; 330. Guide pipe; 400. Reinforcement rib; 500. Expansion joint; 600. Load-bearing vertical beam; 700. Load-bearing horizontal beam; 20. Intermediate economizer outlet pipe; 30. Low-temperature section air preheater. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0037] See also Figure 1 As shown, an embodiment of the present invention provides an anti-clogging smoke transport device 10.

[0038] A smoke transfer device 10 that prevents clogging includes a branch flue pipe 100 , a switch mechanism 200 and an anti-clogging mechanism 300 .

[0039] See also Figure 1 As shown, the branch flue duct 100 includes a first end 110 and a second end 120. The first end 110 is connected to and communicates with the medium temperature section economizer, and the second end 120 is connected to and communicates with the low temperature section air preheater 30.

[0040] See also Figure 1 and Figure 2 As shown, the switch mechanism 200 is connected to the first end 110 for opening or closing the branch flue pipe 100. When the switch mechanism 200 opens the branch flue pipe 100, the switch mechanism 200 simultaneously at least partially closes the intermediate economizer outlet pipe 20 of the medium-temperature section economizer.

[0041] See also Figure 3 and Figure 4 As shown, the anti-blocking mechanism 300 includes a blowing nozzle 310. The blowing nozzle 310 is connected to the branch flue pipe 100 and is close to the second end 120. The blowing nozzle 310 is used to blow air into the branch flue pipe 100.

[0042] Since the medium-temperature section economizer and the low-temperature section air preheater 30 of the boiler equipment are in upper and lower positions, the branch flue pipe 100 is arranged in a vertical direction during installation, and the lower position of the branch flue pipe 100 has a bending structure. Due to the setting of the bending structure, the branch flue pipe 100 is an L-shaped structure. The blowing nozzle 310 is arranged at the bending structure. The blowing nozzle 310 is used to blow away the dust accumulated at the bending structure. When the anti-blocking flue gas transfer device 10 is not in use, since the branch flue pipe 100 is in a unidirectional closed state, the smoke and dust in the low-temperature section air preheater will slowly enter the branch flue pipe 100 and form an accumulation. Therefore, the blowing nozzle 310 is used to blow away the dust accumulated at the bending structure.

[0043] In one embodiment, see Figure 3 As shown, the switch mechanism 200 includes a switch gate 210, a lock 220 and a locking member 230. The switch gate 210 is rotatably connected to the inner wall of the first end 110, the lock 220 is fixedly connected to the inner wall of the first end 110, and the switch gate 210 and the lock 220 are arranged at relative positions. The locking member 230 is connected to the switch gate 210. When the switch gate 210 is rotated to close the branch flue pipe 100, the locking member 230 can be locked with the lock 220. The above-mentioned anti-blocking smoke transfer device 10 is provided with a switch gate 210 for opening or closing the branch flue pipe 100. The switch gate 210 has the same shape and size as the radial surface of the branch flue pipe 100. The switch gate 210 can rotate 90°. When normally closed, the switch gate 210 is located on the radial surface of the branch flue pipe 100. The switch gate 210 can be closed by engaging with the lock 220 at the relative position through the locking member 230. When fully open, the switch gate 210 rotates 90° to fully open the branch flue pipe 100, and all the flue gas passes through the branch flue pipe 100. In one embodiment, when the switch mechanism 200 opens the branch flue pipe 100, the switch mechanism 200 completely closes the outlet pipe of the medium-temperature section economizer. It is not difficult to understand that in another embodiment, when the switch mechanism 200 opens the branch flue pipe 100, the switch mechanism 200 partially closes the outlet pipe of the medium-temperature section economizer.

[0044] The switch gate 210 is made of 10 mm OC r20 Ni stainless steel plate and φ108mm OCr 20 Ni steel pipe is welded.

[0045] In one embodiment, the locking member 230 and the lock buckle 220 can be made of stainless steel plates into an "L"-shaped structure, and the two "L"-shaped structures can be engaged and closed. It is understood that in other embodiments, the structure and shape of the locking member 230 and the lock buckle 220 are not limited to the above, and the structure and shape of the locking member 230 and the lock buckle 220 can also be other structures, such as a magnetic member and a magnetic matching member.

[0046] In one embodiment, the rotation angle range of the switch gate 210 is 0-90°. When the switch gate 210 is reset, it overlaps the radial surface of the branch flue pipe 100. The switch gate 210 can rotate 90° to fully open the branch flue pipe 100.

[0047] In one embodiment, the switch mechanism 200 further includes a drive motor. The drive motor is electrically connected to the rotating shaft of the switch gate 210, and the drive motor is used to drive the switch gate 210 to rotate. The drive motor is not shown in the drawings. The above-mentioned anti-blocking smoke transport device 10 is provided with a drive motor, and the drive motor is electrically connected to the switch gate 210. The drive motor can be connected to the control system to realize remote control of the switch gate 210.

[0048] In one embodiment, see Figure 4 As shown, the anti-blocking mechanism 300 further includes a guide pipe 330. The guide pipe 330 is connected to the blowing nozzle 310. The anti-blocking smoke transfer device 10 is provided with the guide pipe 330 and blows air through the blowing nozzle 310, and the blowing of the blowing nozzle 310 can fluidize the smoke accumulated in the branch flue pipe 100.

[0049] In one embodiment, see Figure 4 As shown, the anti-blocking mechanism 300 further includes a blowing pipe 320, which is connected to the outside of the branch flue pipe 100. The guide pipe 330 is connected to a plurality of blowing nozzles 310 arranged at intervals, and the blowing pipe 320 is connected to the guide pipe 330. The anti-blocking smoke transfer device 10 is provided with a guide pipe 330 to cooperate with the plurality of blowing nozzles 310, and the airflow in the blowing pipe 320 is uniformly dispersed through the guide pipe 330, and the dispersed airflow is blown out through the plurality of blowing nozzles 310 arranged at intervals, so that the smoke accumulated in the branch flue pipe 100 can be fluidized at multiple angles.

[0050] During installation, the guide pipe 330 and the blowing pipe 320 are both arranged outside the branch flue pipe 100, and each blowing nozzle 310 is arranged through the side wall of the branch flue pipe 100, and the outer wall of each blowing nozzle 310 is sealed and connected to the branch flue pipe 100. The outer wall of each blowing nozzle 310 and the branch flue pipe 100 can be sealed by welding.

[0051] In one embodiment, see Figure 4 As shown, a plurality of blowing nozzles 310 are arranged at equal intervals on the guide pipe 330. The plurality of blowing nozzles 310 of the anti-blocking smoke transfer device 10 are arranged at equal intervals on the guide pipe 330, which can realize multi-angle fluidization of smoke accumulated in the branch flue pipe 100.

[0052] In one embodiment, see Figure 3 As shown, the branch flue pipe 100 is a flat structure, and a plurality of blowing nozzles 310 are distributed extending in the width direction of the radial surface of the branch flue pipe 100. For example, in one embodiment, the plurality of blowing nozzles 310 are distributed in a row. It is not difficult to understand that in other embodiments, the plurality of blowing nozzles 310 can also be distributed in multiple rows. The flue branch is welded with A3, δ6mm steel plates.

[0053] In one embodiment, see Figure 1 As shown, the anti-clogging smoke transfer device 10 further includes a reinforcing rib 400. At least one reinforcing rib 400 is provided in the branch flue pipe 100, and the reinforcing rib 400 extends along the axial direction of the branch flue pipe 100. The anti-clogging smoke transfer device 10 improves the strength of the branch flue pipe 100 by providing the reinforcing rib 400.

[0054] In a specific embodiment, the reinforcing ribs 400 inside the flue branch are made of φ57 seamless steel pipes; the reinforcing ribs 400 outside the flue branch are made of 20# channel steel.

[0055] In one embodiment, see Figure 1 As shown, the branch flue pipe 100 includes a plurality of sub-pipes 130. The plurality of sub-pipes 130 are connected in sequence. An expansion joint 500 is connected between at least one group of adjacent sub-pipes 130. The above-mentioned anti-clogging smoke transfer device 10 facilitates the installation and disassembly of the branch flue pipe 100 by providing a plurality of sub-pipes 130, and an expansion joint 500 is connected between at least one group of adjacent sub-pipes 130 to adapt to the deformation of the sub-pipes 130. The expansion joint 500 is installed above the bending structure.

[0056] Preferably, the outside of the branch flue pipe 100 is wrapped with an insulation layer, which is not shown in the attached drawings. The insulation layer is made of an aluminum silicate fiber blanket, and the thickness of the insulation layer is 100 mm. Specifically, an aluminum silicate fiber blanket with a thickness of 100 mm (purchased from Hebei Huaneng, with a size of 3600 mm × 610 mm × 50 mm, and a bulk density of 105 kg / m3) is wrapped around the outside of the branch flue pipe 100 to ensure that the aluminum silicate fiber blanket and the branch flue pipe 100 are tight and free of hollows. There shall be no gaps or vacancies between adjacent aluminum silicate fiber blankets, and the undercut width shall not be less than 50 mm. After the aluminum silicate fiber blankets are tied at the corners of the branch flue pipe 100 (the four corners of the branch flue pipe 100), they are compacted with a wire mesh with a width of 40 mm.

[0057] In one embodiment, see Figure 1 and Figure 2 As shown, the anti-blocking smoke transfer device 10 also includes a bearing vertical beam 600 and a bearing cross beam 700. The bearing vertical beam 600 is arranged in the vertical direction. The bearing cross beam 700 is arranged in the horizontal direction. During installation, the bearing vertical beam 600 is fixed to the ground, and the top of the bearing cross beam 700 is connected to the bearing vertical beam 600. The bearing vertical beam 600 and the bearing cross beam 700 cooperate to support the branch flue pipe 100. There is a spacing between the bearing vertical beam 600 and the branch flue pipe 100, and the spacing can be set to 500 mm.

[0058] The relevant parameter data of the above-mentioned anti-clogging smoke transport device 10 can be set as follows:

[0059] The width of the branch flue pipe 100 is 5400 mm, and the thickness of the branch flue pipe 100 is 900 mm.

[0060] The maximum vertical height of the branch flue pipe 100 is 10000 mm. The vertical height of the L-shaped branch flue pipe 100 is 9250 mm, and the horizontal length is 3000 mm, that is, the length of one arm of the bending structure of the branch flue pipe 100 is 9250 mm, and the length of the other arm is 3000 mm. The thickness of the horizontal part of the branch flue pipe 100 is 750 mm.

[0061] The length of the switch gate 210 is 780 mm, and the length of the lock 220 is 120 mm. The thickness of the outlet pipe of the medium-temperature section economizer along the vertical direction is 800 mm, and the hinge of the switch gate 210 is 300 mm away from the outlet pipe of the medium-temperature section economizer.

[0062] The cross section of the load-bearing beam 600 is a 300mm×300mm square, and the height of the load-bearing beam 600 is 9970mm. It should be noted that the above parameter data only expresses one embodiment of the present invention, and the description is relatively specific and detailed, but it cannot be understood as a limitation on each parameter.

[0063] An embodiment of the present invention further provides a boiler device.

[0064] A boiler equipment includes a boiler main body system and an anti-clogging flue gas transfer device 10. The anti-clogging flue gas transfer device 10 is connected between the medium-temperature section economizer and the low-temperature section air preheater 30 of the boiler main body system, the first end 110 of the branch flue pipe 100 is connected to the medium-temperature section economizer and communicated with the intermediate economizer outlet pipe 20 of the medium-temperature section economizer, and the second end 120 of the branch flue pipe 100 is connected to the low-temperature section air preheater 30 and communicated with the low-temperature section air preheater 30. When in use, the boiler equipment operates normally, and the anti-clogging flue gas transfer device 10 is not put into operation. When it is found that the outlet flue gas temperature of the low-temperature section air preheater 30 rises, the air temperature of the air preheater outlet of the boiler primary air and the boiler secondary air decreases, and the air volume upper limit of the boiler primary air and the boiler secondary air decreases more, it means that the pipeline between the low-temperature section air preheater 30 and the medium-temperature section economizer is blocked, at this time, the anti-clogging flue gas transfer device 10 is put into operation. During the operation of the anti-clogging flue gas transfer device 10, the exhaust gas temperature will increase and the boiler thermal efficiency will decrease. The purpose is to permanently reduce the exhaust gas temperature, thereby reducing exhaust gas heat loss and improving boiler efficiency.

[0065] In one embodiment, temperature measuring devices are installed on the left and right sides of the low-temperature section air preheater 30 and the medium-temperature section economizer, respectively.

[0066] The above-mentioned anti-clogging flue gas transfer device 10 can effectively reduce the heat loss of boiler flue gas, improve the thermal efficiency of the boiler, and prevent the pipeline from being blocked by ammonium bisulfate crystals. When the boiler is operating normally and the above-mentioned device is not put into operation, when it is found that the outlet flue gas temperature of the low-temperature section air preheater 30 rises, the air temperature of the boiler primary air and the boiler secondary air of the air preheater outlet decreases, and the upper limit of the air volume of the boiler primary air and the boiler secondary air decreases significantly, it means that the pipeline between the low-temperature section air preheater 30 and the medium-temperature section economizer is blocked. At this time, first open the anti-clogging mechanism 300 of the anti-clogging flue gas transfer device 10, and the anti-clogging mechanism 300 blows air into the branch flue pipe 100 through the blowing nozzle 310 to fluidize the smoke and dust accumulated in the branch flue pipe 100. Secondly, slowly open the switch mechanism 200, and observe the outlet flue gas temperature of the low-temperature section air preheater 30 at the same time. If the temperature rises, it indicates that the anti-clogging flue gas transfer device 10 is operating normally. Finally, adjust the opening of the switch mechanism 200 to control the outlet flue gas temperature between 180°C and 200°C, and the anti-clogging flue gas transfer device operates for at least 12 hours.

[0067] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An anti-blocking smoke transport device, characterized in that: It includes a branch flue pipe, a switch mechanism and an anti-blocking mechanism; the branch flue pipe includes a first end and a second end, the first end is used to be connected to a medium-temperature economizer and communicated with the economizer outlet pipe of the medium-temperature economizer, the second end is used to be connected to a low-temperature air preheater and communicated with the low-temperature air preheater, the switch mechanism is connected to the first end to open or close the branch flue pipe, the anti-blocking mechanism includes a blowing nozzle, the blowing nozzle is connected to the branch flue pipe and is close to the second end, the blowing nozzle is used to blow air into the branch flue pipe, the switch mechanism includes a switch gate, a lock and a locking member, the switch gate can be rotatably connected to the inner wall of the first end, the lock is fixedly connected to the inner wall of the first end, the switch gate and the lock are arranged at relative positions, the locking member is connected to the switch gate, and when the switch gate is rotated to close the branch flue pipe, the locking member can be locked with the lock.

2. The anti-clogging smoke transport device according to claim 1, characterized in that: The rotation angle range of the switch gate is 0-90°. When the switch gate is reset, it overlaps with the radial surface of the branch flue pipe. The switch gate can be rotated 90° to fully open the branch flue pipe.

3. The anti-clogging smoke transport device according to claim 1, characterized in that: The switch mechanism further includes a drive motor, which is electrically connected to a rotating shaft of the switch gate and is used to drive the switch gate to rotate.

4. The anti-clogging smoke transport device according to any one of claims 1 to 3, characterized in that: The anti-blocking mechanism also includes a flow guide pipe, which is connected to the blowing nozzle.

5. The anti-clogging smoke transport device according to claim 4, characterized in that: The anti-blocking mechanism also includes a blowing pipe, which is connected to the outside of the branch flue pipe. The guide pipe is connected to a plurality of the blowing nozzles arranged at intervals, and the blowing pipe is connected to the guide pipe.

6. The anti-blocking smoke transport device according to claim 5, characterized in that: The plurality of blowing nozzles are arranged at equal intervals on the flow guide pipe.

7. The anti-clogging smoke transport device according to claim 5, characterized in that: The branch flue pipe is a flat structure, and the plurality of blowing nozzles are extended and distributed in the width direction of the radial surface of the branch flue pipe.

8. The anti-clogging smoke transport device according to any one of claims 1-3 and 5-7, characterized in that: It also includes reinforcing ribs. At least one of the reinforcing ribs is arranged in the branch flue pipe, and the reinforcing rib extends along the axial direction of the branch flue pipe.

9. The anti-clogging smoke transport device according to any one of claims 1-3, 5-7, characterized in that: The branch flue pipe comprises a plurality of sub-pipes, the plurality of sub-pipes are connected in sequence, and at least one group of adjacent sub-pipes is connected with an expansion joint.

10. A boiler equipment, characterized in that: It comprises a boiler main body system and the anti-clogging flue gas transfer device as described in any one of claims 1 to 9, wherein the anti-clogging flue gas transfer device is connected between the medium-temperature section economizer and the low-temperature section air preheater of the boiler main body system, the first end of the branch flue pipe is connected to the medium-temperature section economizer and communicated with the medium-temperature section economizer, and the second end of the branch flue pipe is connected to the low-temperature section air preheater and communicated with the low-temperature section air preheater.

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