Fan-shaped plate purging system of rotary air preheater

Abstract

The utility model relates to the technical field of flue gas treatment, and discloses a sector plate purging system of a rotary air preheater, which comprises a preheater main body and a sector plate arranged in the preheater main body, a cold primary air duct and a negative pressure smoke outlet duct are formed in the preheater main body, and the negative pressure smoke outlet duct is arranged in the sector plate. The fan-shaped plate comprises a fan-shaped plate main body as well as a sealing plate and a cover plate which are arranged on the fan-shaped plate main body, and a cavity is defined by the sealing plate and the cover plate; the sector plate purging system of the rotary air preheater further comprises a purging pipe and an ash outlet pipe. The purging pipe penetrates through the sealing plate and comprises an air inlet end and an air outlet end, the air outlet end is located in the cavity, and the air inlet end communicates with the cold primary air duct; one end of the ash outlet pipe is arranged on the sealing plate and communicated with the cavity, and the other end of the ash outlet pipe is communicated with the negative pressure smoke outlet channel. According to the technical scheme, dust can be prevented from being accumulated in the cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a rotary air preheater fan-shaped plate purge system. Background Art

[0002] The air preheater is a heating surface where the flue gas in the flue at the tail of the boiler preheats the air before entering the boiler to a certain temperature through the internal heat sink. It is a device used to improve the heat exchange performance of the boiler and reduce energy consumption. During the operation of the air preheater, the hot end beam of the air preheater and the sealing plate fixed on the hot end beam are fixed. Since the rotor is deformed in a "mushroom" shape after being heated, it is necessary to adjust the fan plate upward or downward to maintain the sealing gap to control the air leakage. Therefore, there is a dynamic and static sealing gap between the fan plate and the sealing plate. Due to the inconsistent air flow pressure on both sides of the fan plate, the existence of the pressure difference causes the formation of medium flow in the fan plate, that is, the air flow flows from the high pressure side to the low pressure side. Because the air flow carries smoke and dust, when it passes through the sealing gap and enters the fan plate chamber, it expands and slows down, forming gas-solid separation, and part of the smoke and dust settles in the fan plate. Over time, the smoke and dust accumulate more and more, and the upward height of the fan plate is continuously reduced. In severe cases, the rotor may be stuck, which seriously threatens the safe operation of the air preheater. Utility Model Content

[0003] The main purpose of the utility model is to provide a rotary air preheater fan plate purge system, aiming at preventing dust from accumulating in the cavity.

[0004] To achieve the above-mentioned purpose, the rotary air preheater fan plate purge system proposed in the utility model comprises a preheater body and a fan plate arranged in the preheater body, a cold primary air duct and a negative pressure smoke outlet duct are formed in the preheater body, the fan plate comprises a fan plate body and a sealing plate and a cover plate arranged in the fan plate body, the sealing plate and the cover plate enclose a cavity, and the rotary air preheater fan plate purge system also comprises:

[0005] a purge pipe, the purge pipe being disposed through the sealing plate, the purge pipe comprising an air inlet end and an air outlet end, the air outlet end being located in the cavity; and

[0006] An ash discharge pipe, wherein the ash discharge pipe is disposed on the sealing plate, and an inner cavity of the ash discharge pipe is connected to the cavity;

[0007] The air outlet end is arranged close to the small end of the fan-shaped plate, the ash outlet pipe is arranged on the end surface of the large end of the fan-shaped plate, and the air outlet of the air outlet end faces the ash outlet pipe.

[0008] Optionally, the purge pipe includes a purge main pipe and two purge sub-pipes, the purge main pipe is connected to the cold primary air duct, the two purge sub-pipes are connected to the purge main pipe, and the two purge sub-pipes are both arranged through the sealing plate.

[0009] Optionally, the purge sub-pipe includes a purge branch pipe and five purge branch pipes, the purge branch pipe is connected to the purge main pipe, the five purge branch pipes are all connected to the purge branch pipe, and the five purge branch pipes are all arranged through the sealing plate;

[0010] Among them, from the small end of the fan-shaped plate to the large end of the fan-shaped plate, the five purge branch pipes are distributed at intervals.

[0011] Optionally, a steering diffuser nozzle is provided at one end of the purge branch pipe away from the purge sub-pipe.

[0012] Optionally, the purge branch pipe is provided with an isolation ball valve.

[0013] Optionally, the purge main pipe is provided with a first isolation gate valve.

[0014] Optionally, the purge mother pipe is provided with a first metal expansion joint.

[0015] Optionally, the ash discharge pipe includes a main ash discharge pipe and two sub-ash discharge pipes, the main ash discharge pipe is connected to the negative pressure flue, the two sub-ash discharge pipes are connected to the main ash discharge pipe, and the inner cavities of the two sub-ash discharge pipes are connected to the cavity.

[0016] Optionally, the ash discharge pipe is provided with a second isolation gate valve.

[0017] Optionally, the ash discharge mother pipe is provided with a second metal expansion joint.

[0018] In the technical solution of the utility model, the air outlet end of the purge pipe is arranged near the small end of the fan-shaped plate, the ash outlet pipe is arranged on the end face of the large end of the fan-shaped plate, and the air outlet of the air outlet end faces the ash outlet pipe. The wind blown out by the purge pipe can blow the dust in the cavity to the ash outlet pipe, and then be discharged from the ash outlet pipe, so as to avoid the accumulation of dust in the cavity, ensure the upward height of the fan-shaped plate and the safe operation of the air preheater. Among them, the purge wind source of the purge pipe is provided by the cold primary air in the cold primary air duct of the preheater body, and the purge kinetic energy is strong, and no additional blowing equipment is needed; and the ash outlet pipe is connected to the negative pressure flue, and the amplification effect of the negative pressure on the dust collection can increase the purge effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 The utility model is a three-dimensional structural schematic diagram of an embodiment of the rotary air preheater fan plate purge system provided by the utility model.

[0021] Description of Figure Numbers:

[0022]

[0023] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their 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 addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0027] Please refer to Figure 1The utility model proposes a rotary air preheater fan-shaped plate purge system 1000, comprising a preheater body and a fan-shaped plate arranged in the preheater body, a cold primary air duct and a negative pressure smoke outlet duct are formed in the preheater body, the fan-shaped plate comprises a fan-shaped plate body 1 and a sealing plate 2 and a cover plate 3 arranged on the fan-shaped plate body 1, the sealing plate 2 and the cover plate 3 enclose a cavity; the rotary air preheater fan-shaped plate purge system 1000 also includes a purge pipe and an ash outlet pipe; the purge pipe is penetrated by the sealing plate 2, the purge pipe comprises an air inlet end and an air outlet end, the air outlet end is located in the cavity, and the air inlet end is connected with the cold primary air duct; one end of the ash outlet pipe is arranged on the sealing plate 2 and is connected with the cavity, and the other end of the ash outlet pipe is connected with the negative pressure smoke outlet duct; wherein the air outlet end is arranged close to the small end of the fan-shaped plate, the ash outlet pipe is arranged on the end face of the large end of the fan-shaped plate, and the air outlet of the air outlet end faces the ash outlet pipe.

[0028] In the technical solution of the utility model, the air outlet end of the purge pipe is arranged near the small end of the fan-shaped plate, the ash outlet pipe is arranged on the end face of the large end of the fan-shaped plate, and the air outlet of the air outlet end faces the ash outlet pipe. The wind blown out by the purge pipe can blow the dust in the cavity to the ash outlet pipe, and then be discharged from the ash outlet pipe, so as to avoid the accumulation of dust in the cavity, ensure the upward height of the fan-shaped plate and the safe operation of the air preheater. Among them, the purge wind source of the purge pipe is provided by the cold primary air in the cold primary air duct of the preheater body, and the purge kinetic energy is strong, and no additional blowing equipment is needed; and the ash outlet pipe is connected to the negative pressure flue, and the amplification effect of the negative pressure on the dust collection can increase the purge effect.

[0029] Specifically, in one embodiment of the present invention, please refer to Figure 1 The purge pipe includes a purge main pipe 4 and two purge sub-pipes. The purge main pipe 4 is connected to the cold primary air duct. The two purge sub-pipes are connected to the purge main pipe 4. The two purge sub-pipes are both arranged through the sealing plate 2. By setting two purge sub-pipes, the number of air outlets can be increased, thereby increasing the purge effect. Among them, the purge main pipe 4 uses a φ108×5 seamless steel pipe.

[0030] In order to obtain a better purging effect, in one embodiment of the present invention, please refer to Figure 1The purge sub-pipe includes a purge branch pipe 5 and five purge branches 6. The purge branch pipe 5 is connected to the purge main pipe 4. The five purge branches 6 are all connected to the purge branch pipe 5. The five purge branches 6 are all arranged in the sealing plate 2. Among them, from the small end of the fan-shaped plate to the large end of the fan-shaped plate, the five purge branches 6 are spaced apart. Thus, a two-way and five-row design is formed, which can basically achieve full coverage of the dust accumulation area, so as to better blow the dust in the cavity to the ash outlet pipe and then discharge it from the ash outlet pipe, and then discharge it from the ash outlet pipe to achieve a better purge effect. And each purge branch pipe 6 is provided with an isolation ball valve 62. In actual use, the opening of the isolation ball valve 62 can be controlled to control whether the purge branch pipe 6 discharges air. For example, when the dust accumulation is serious, the purge branch pipe 6 can be controlled to discharge air in sequence from the small end of the fan-shaped plate to the large end of the fan-shaped plate, so as to achieve circle-by-circle purge and obtain a better purge effect. Among them, the purge branch pipe 5 is made of φ108×5 seamless steel pipe, and the two purge branch pipes 5 correspond to the radial 1 / 4 equal division position and 3 / 4 equal division position of the fan plate respectively. The two purge branch pipes 5 are connected to the purge main pipe 4 through T108×5 equal-diameter tees, and T108×108×48 reducing tees are installed on the purge air branch pipe corresponding to the six equal division positions of the radial length of the fan plate. The purge branch pipe 6 is made of φ48×3 seamless steel pipe, and the size of the isolation ball valve 62 is DN40.

[0031] Further, in one embodiment of the present invention, please refer to Figure 1 The end of the purge branch pipe 6 away from the purge branch pipe 5 is provided with a steering diffuser nozzle 61, which can effectively increase the jet speed and kinetic energy of the airflow, improve the jet force and impact force; and can change the flow direction of the airflow, and by adjusting the angle and structure of the nozzle, the airflow jet direction can be turned to a specific angle or range. By increasing the airflow speed and turning the steering diffuser nozzle 61, the airflow can carry more dust, the dust flow direction is clearer, and the purge effect is better.

[0032] For the convenience of control, in one embodiment of the present utility model, please refer to Figure 1 The purge main pipe 4 is provided with a first isolation gate valve 41; the first isolation gate valve 41 can open or close the flow channel by moving the valve disc up and down, thereby isolating the airflow or opening the channel. The isolation gate valve has good sealing performance and small flow resistance, can be opened and closed quickly and conveniently, and has a self-locking function to prevent accidental opening or closing. Among them, the size of the first isolation gate valve 41 is DN100.

[0033] Further, in one embodiment of the present invention, please refer to Figure 1 The purge mother pipe 4 is provided with a first metal expansion joint 42, which can absorb the expansion and contraction deformation and vibration of the pipeline caused by temperature changes, thereby improving the safety and reliability of the system. The size of the first metal expansion joint 42 is DN100.

[0034] Specifically, in one embodiment of the present invention, please refer to Figure 1 The ash discharge pipe includes a main ash discharge pipe 7 and two sub-ash discharge pipes 8. The main ash discharge pipe 7 is connected to the negative pressure flue, and the two sub-ash discharge pipes 8 are connected to the main ash discharge pipe 7. The inner cavities of the two sub-ash discharge pipes 8 are connected to the cavity. The two sub-ash discharge pipes 8 correspond to the two-way purge branch pipes 5, so that the dust blown by the two groups of purge sub-pipes can be better received, and a better purge effect can be obtained. Among them, the sub-ash discharge pipes 8 and the main ash discharge pipe 7 are both made of φ159×6 seamless steel pipes, and the two sub-ash discharge pipes 8 and the main ash discharge pipe 7 are connected by T159×6 equal-diameter tees.

[0035] For the convenience of control, in one embodiment of the present utility model, please refer to Figure 1 The ash discharge pipe 8 is provided with a second isolation gate valve 81; the second isolation gate valve 81 can open or close the flow channel by moving the valve disc up and down, thereby isolating the airflow or opening the channel. The isolation gate valve has good sealing performance and small flow resistance, can be opened and closed quickly and conveniently, and has a self-locking function to prevent accidental opening or closing. Among them, the size of the second isolation gate valve 81 is DN150.

[0036] Further, in one embodiment of the present invention, please refer to Figure 1 The ash discharge mother pipe 7 is provided with a second metal expansion joint 71, which can absorb the expansion and contraction deformation and vibration of the pipeline caused by temperature changes, thereby improving the safety and reliability of the system. The size of the second metal expansion joint 71 is DN150.

[0037] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A rotary air preheater fan plate purge system, comprising a preheater body and a fan plate arranged in the preheater body, wherein a cold primary air duct and a negative pressure smoke outlet duct are formed in the preheater body, wherein the fan plate comprises a fan plate body and a sealing plate and a cover plate arranged in the fan plate body, wherein the sealing plate and the cover plate enclose a cavity, wherein: The rotary air preheater fan plate purge system also includes: a purge pipe, the purge pipe being passed through the sealing plate, the purge pipe comprising an air inlet end and an air outlet end, the air outlet end being located in the cavity, and the air inlet end being communicated with the cold primary air duct; and An ash discharge pipe, one end of which is disposed on the sealing plate and communicated with the cavity, and the other end of which is communicated with the negative pressure flue; The air outlet end is arranged close to the small end of the fan-shaped plate, the ash outlet pipe is arranged on the end surface of the large end of the fan-shaped plate, and the air outlet of the air outlet end faces the ash outlet pipe.

2. The rotary air preheater fan plate purge system according to claim 1, characterized in that: The purge pipe includes a purge main pipe and two purge sub-pipes. The purge main pipe is connected to the cold primary air duct, and the two purge sub-pipes are both connected to the purge main pipe. The two purge sub-pipes are both arranged through the sealing plate.

3. The rotary air preheater fan plate purge system according to claim 2, characterized in that: The purge sub-pipe includes a purge branch pipe and five purge branch pipes, the purge branch pipe is connected to the purge main pipe, the five purge branch pipes are all connected to the purge branch pipe, and the five purge branch pipes are all arranged through the sealing plate; Among them, from the small end of the fan-shaped plate to the large end of the fan-shaped plate, the five purge branch pipes are distributed at intervals.

4. The rotary air preheater fan plate purge system according to claim 3, characterized in that: The end of the purge branch pipe away from the purge sub-pipe is provided with a steering diffuser nozzle.

5. The rotary air preheater sector plate purge system according to claim 3, characterized in that: The purge branch pipe is provided with an isolation ball valve.

6. The rotary air preheater sector plate purge system according to claim 2, characterized in that: The purge main pipe is provided with a first isolation gate valve.

7. The rotary air preheater sector plate purge system according to claim 2, characterized in that: The purge mother pipe is provided with a first metal expansion joint.

8. The rotary air preheater sector plate purge system according to any one of claims 1 to 7, characterized in that: The ash discharge pipe comprises a main ash discharge pipe and two sub-ash discharge pipes. The main ash discharge pipe is connected to the negative pressure flue gas duct, the two sub-ash discharge pipes are connected to the main ash discharge pipe, and the inner cavities of the two sub-ash discharge pipes are connected to the cavity.

9. The rotary air preheater sector plate purge system according to claim 8, characterized in that: The ash discharge pipe is provided with a second isolation gate valve.

10. The rotary air preheater sector plate purge system according to claim 8, characterized in that: The ash discharge mother pipe is provided with a second metal expansion joint.

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