Ash removal device of rotary air pre-heater

Abstract

The utility model discloses a deashing device of a rotary air pre-heater, which comprises a rotary base and an upper beam, a movable rotary cover is arranged between the rotary base and the upper beam, a deashing structure is arranged on the rotary cover, a middle cavity is arranged in the rotary cover, and the deashing structure comprises a first deashing assembly, a second deashing assembly and a third deashing assembly. The middle cavity is formed in the rotary cover, so that the rotary cover is divided into the hot section and the cold section, soot blowing is conducted on the interior of the rotary cover through the first soot cleaning assembly, the second soot cleaning assembly and the third soot cleaning assembly, and the first soot cleaning assembly and the second soot cleaning assembly can efficiently flush the hot section; the second ash removal assembly and the third ash removal assembly efficiently flush the cold section, the ash blowing pressure is prevented from being reduced, ammonium bisulfate is prevented from being blocked at the upper end and the lower end of the middle cavity, the heat transfer resistance of the rotary air pre-heater is reduced, the heat transfer efficiency is improved, and the exhaust gas temperature of a boiler is increased.

Description

Technical Field

[0001] This utility model relates to the field of air preheater technology, and in particular to a dust removal device for a rotary air preheater. Background Technology

[0002] In the actual operation of coal-fired power plants, the rotary air preheater (APH) is an important component of the boiler system, and its performance directly affects the boiler's thermal efficiency and operational stability. However, traditional rotary air preheater cleaning technology has significant shortcomings and urgently needs improvement.

[0003] Traditional soot blowing technology typically involves two steam soot blowers plus a low-pressure water flushing device at the hot end of the air preheater, and one steam soot blower at the cold end. This technology faces several challenges in practical application. First, the pressure of the high-pressure superheated steam gradually decreases as it travels along the soot blowing pipe. By the time the steam reaches the front end of the pipe, its pressure is far below the rated soot blowing pressure, resulting in only localized cleaning and leaving a large amount of ammonium bisulfate (ABS) residue on the rotor.

[0004] Ammonium bisulfate has strong viscosity and easily deposits in the middle section of the air preheater, adsorbing fly ash from the flue gas and causing severe ash blockage. Traditional cleaning techniques are difficult to use to clean the middle section with steam or high-pressure water. This not only increases the heat transfer resistance of the air preheater and reduces its heat transfer efficiency, but also raises the boiler exhaust temperature, increases the power consumption of the induced draft fan and primary air fan, and may even cause fan vibration, affecting the safe and economical operation of the unit.

[0005] In view of the above, this utility model is hereby proposed. Utility Model Content

[0006] This application provides a dust removal device for a rotary air preheater, including a rotating base and an upper beam. A movable rotating cover is provided between the rotating base and the upper beam. A dust removal structure is provided on the rotating cover, and a central cavity is opened inside the rotating cover.

[0007] The dust removal structure includes a first dust removal component, a second dust removal component, and a third dust removal component. The first dust removal component and the third dust removal component are located at the upper and lower ends of the rotating cover, respectively, and the second dust removal component is located in the middle cavity.

[0008] Furthermore, the first dust removal assembly includes a first swing arm movably disposed on one side of the upper beam, and a plurality of steam soot blowers are evenly disposed at the bottom of the first swing arm along its length direction, with the steam soot blowers facing the rotating hood.

[0009] Furthermore, an ultrasonic generator is installed in the steam inlet pipe of the steam soot blower. The ultrasonic generator is used to remove dirt from the surface of the rotating hood.

[0010] Further, the first swing lever is provided with a rotating shaft near one end of the upper beam, the rotating shaft is rotatably installed on one side of the upper beam through a mounting seat, and the rotating shaft is driven by a first driving motor.

[0011] Further, the first swing lever is provided with a rotating shaft near one end of the upper beam, the rotating shaft is rotatably installed on one side of the upper beam through a mounting seat, and the rotating shaft is driven by a first driving motor.

[0012] Further, the rotating cover comprises an outer shell plate arranged on the rotating base;

[0013] The outer shell plate is provided with a rotatable slewing bearing at the center, and the slewing bearing is provided with a central cylinder concentrically;

[0014] A plurality of partition plates are uniformly arranged between the outer wall of the central cylinder and the inner wall of the slewing bearing in the circumferential direction;

[0015] A plurality of heat exchange fins are arranged between the adjacent two partition plates in the length direction thereof;

[0016] The middle cavity is arranged between the heat exchange fins to separate the heat exchange fins into an upper heat exchange area and a lower heat exchange area.

[0017] Further, a driving shaft is arranged in the central cylinder, the driving shaft penetrates the rotating base, the rotating cover and the upper beam from bottom to top in sequence, and the driving shaft is driven by a second driving motor.

[0018] Further, the bottom of the outer shell plate is further provided with a cross-section flow field sensor.

[0019] By adopting the above technical scheme, the utility model has the following beneficial effects:

[0020] By arranging the middle cavity in the rotating cover, the rotating cover is divided into a hot section and a cold section, and the first, second and third ash blowing components are arranged to blow ash in the rotating cover, so that the first and second ash blowing components can efficiently flush the hot section, the second and third ash blowing components can efficiently flush the cold section, the reduction of ash blowing pressure is avoided, ammonium bisulfate is prevented from being blocked at the upper and lower ends of the middle cavity, the heat transfer resistance of the rotary air preheater is reduced, the heat transfer efficiency is improved, the exhaust gas temperature of the boiler is increased.

[0021] The specific embodiments of the utility model are described in further detail in combination with the drawings. DRAWINGS

[0022] The accompanying drawings, which are part of the present application, serve to further understand the present application, and the schematic embodiments of the present application and the descriptions thereof serve to explain the present application but do not constitute improper limitations on the present application. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings. In the drawings:

[0023] Figure 1 A structural schematic view of the ash removal device of the rotary air preheater provided in the present application is shown in the figure;

[0024] Figure 2 A structural schematic view of the ash removal device of the rotary air preheater provided in the present application is shown in the figure; Figure 1 A structural schematic view of the ash removal device of the rotary air preheater provided in the present application is shown in the figure;

[0025] Figure 3 A sectional view of the rotary cover of the ash removal device of the rotary air preheater provided in the present application is shown in the figure.

[0026] Reference signs: 1, rotary base; 2, upper beam; 3, primary air outlet; 4, secondary air outlet; 5, flue gas inlet; 6, rotary cover; 7, driving shaft; 8, ash removal structure; 9, arc-shaped groove; 10, second ash removal assembly; 11, third ash removal assembly; 12, cross-section flow field sensor; 61, rotary bearing; 62, external shell plate; 63, partition plate; 64, heat exchange fin; 81, first swing rod; 82, steam sootblower; 83, convex shaft.

[0027] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] Referring to Figures 1 to 3 The present application provides an ash removal device of a rotary air preheater, which comprises a rotary base 1 and an upper beam 2, a movable rotary cover 6 is arranged between the rotary base 1 and the upper beam 2, an ash removal structure 8 is arranged on the rotary cover 6, a middle cavity is formed in the rotary cover 6, the ash removal structure 8 comprises a first ash removal assembly, a second ash removal assembly 10 and a third ash removal assembly 11, the first ash removal assembly and the third ash removal assembly 11 are respectively arranged at the upper and lower ends of the rotary cover 6, and the second ash removal assembly 10 is arranged in the middle cavity.

[0029] In the above scheme, by setting the middle cavity in the rotating cover 6, the rotating cover 6 is divided into hot and cold sections, and the first, second and third ash removal assemblies 10 and 11 are arranged to blow ash in the rotating cover 6, so that the first and second ash removal assemblies 10 and 11 can efficiently wash the hot section, and the second and third ash removal assemblies 10 and 11 can efficiently wash the cold section, avoiding the reduction of ash blowing pressure, preventing ammonium bisulfate from being blocked on the upper and lower ends of the middle cavity, reducing the heat transfer resistance of the rotary air preheater provided in the embodiment, improving the heat transfer efficiency, and increasing the flue gas temperature of the boiler.

[0030] In some possible embodiments, referring to Figure 2 As shown in Figure 3 The first ash removal assembly includes a first swing rod 81 movably arranged on one side of the upper beam 2, a plurality of steam ash blowers 82 are uniformly arranged on the bottom of the first swing rod 81 along the length direction, the steam ash blowers 82 are arranged towards the rotating cover 6, an ultrasonic generator is additionally arranged on the steam inlet pipeline of the steam ash blower 82, the ultrasonic generator is used to strip the dirt on the surface of the rotating cover 6, the steam ash blower 82 is connected with the steam pipeline, and the steam ash blower 82 and the ultrasonic generator directly adopt the prior art, and the specific structure of the steam ash blower 82 and the ultrasonic generator is not limited in the embodiment.

[0031] In the above scheme, by additionally arranging the ultrasonic generator on the steam inlet pipeline of the steam ash blower 82, the dirt on the surface of the heat exchange element can be stripped by the cavitation effect of the ultrasonic wave in the medium during the ash blowing process of the steam ash blower 82, so that the steam ash blowing has a cleaning function, and the adhering objects on the surface of the heat exchange element are further cleaned.

[0032] In some possible embodiments, referring to Figure 2 As shown in The first swing rod 81 has a rotating shaft near one end of the upper beam 2, the rotating shaft is rotatably installed on one side of the upper beam 2 through a mounting seat, the rotating shaft is driven by a first driving motor, the first driving motor is controlled by a control system to realize reciprocating rotation, when ash blowing of the rotating cover 6 is needed, the first driving motor is started to make the output shaft of the first driving motor reciprocate, the rotation of the output shaft of the first driving motor drives the first swing rod 81 to reciprocate, thereby driving the steam ash blower 82 to reciprocate during the ash blowing process, so that the steam ash blower 82 can make fan-shaped swinging blowing in the bin, and realize full coverage blowing and sweeping of the through-flow section in the bin.

[0033] In some possible embodiments, referring to Figure 2 As shown in The first swing rod 81 is provided with a convex shaft 83 at the bottom of the end away from the upper beam 2, the rotating cover 6 is provided with an arc-shaped groove 9 matched with the convex shaft 83, and the lower end of the convex shaft 83 is slidably arranged in the arc-shaped groove 9.

[0034] In the above scheme, the first swing lever 81 is supported by the convex shaft 83, and the convex shaft 83 can slide in the arc-shaped groove 9, so that the swing of the first swing lever 81 is more stable.

[0035] In some possible embodiments, referring to Figure 2 As shown, the rotating cover 6 includes an outer shell plate 62 arranged on the rotating base 1, and a rotatable slewing bearing 61 is arranged at the center of the outer shell plate 62. The slewing bearing 61 is concentrically provided with a central cylinder. A plurality of partitions 63 are uniformly arranged in the circumferential direction between the outer wall of the central cylinder and the inner wall of the slewing bearing 61. Compartments are formed between adjacent partitions 63. Each compartment is 15°. In order to arrange a double sealing structure, each compartment is divided into two. Each compartment is connected with the central cylinder through a positioning pin and a fixing pin. Adjacent compartments are connected through bolts. This structure can greatly reduce the installation workload. A plurality of heat exchange fins 64 are arranged along the length direction between adjacent two partitions 63. A middle cavity is arranged between the heat exchange fins 64 to divide the heat exchange fins 64 into an upper heat exchange area and a lower heat exchange area. The heat exchange fins 64 of the upper heat exchange area are composed of carbon steel plates pressed into special waveforms. Each heat exchange fin 64 of the upper heat exchange area is composed of a positioning plate with vertical large corrugations and disturbance inclined waves, and a corrugated plate with the same inclined waves is alternately stacked and bundled.

[0036] In some possible embodiments, referring to Figure 2 With Figure 3 As shown, a driving shaft 7 is arranged in the central cylinder. The driving shaft 7 penetrates the rotating base 1, the rotating cover 6 and the upper beam 2 from bottom to top in sequence. The driving shaft 7 is driven by a second driving motor. When the rotary air preheater provided in the embodiment exchanges heat, the second driving motor is started to drive the output shaft of the second driving motor to rotate and drive a plurality of compartments and the slewing bearing 61 to rotate.

[0037] In some possible embodiments, the bottom of the outer shell plate 62 is further provided with a cross-section flow field sensor 12. The cross-section flow field sensor 12 is used to detect the blowing effect of the steam soot blower 82, monitor the wind resistance and blockage of the through-flow cross-section of the rotary air preheater, and can also display the through-flow resistance of each cross-section of the rotary air preheater and the distribution change of the flue gas flow field of each compartment online through a connected display device, so as to realize intelligent and accurate blowing for the through-flow cross-section of the rotary air preheater and avoid over-blowing or under-blowing of each part.

[0038] It should be noted that the rotary cover 6 is also provided with a primary air outlet 3, a secondary air outlet 4 and a flue gas inlet 5, the primary air outlet 3 is mainly responsible for delivering the preheated hot air to the combustion system of the boiler, the secondary air outlet 4 is used to deliver the preheated hot air to the boiler furnace to provide the necessary hot air for the combustion of pulverized coal, and can also enhance the disturbance and prolong the residence time of hot flue gas in the furnace and the vertical flue, thereby improving the combustion efficiency, adjusting the amount of secondary air through the secondary air outlet 4, controlling the oxygen content of the flue gas in the furnace, and then controlling the combustion process and the furnace temperature, the flue gas inlet 5 is the connection point between the boiler tail flue and the rotary air preheater, responsible for introducing the high-temperature flue gas generated by the boiler combustion into the rotary air preheater, before the flue gas enters the rotary air preheater, it will usually go through a series of flue gas purification treatments such as desulfurization, denitrification and dust removal to ensure that the discharged flue gas meets environmental standards.

[0039] By setting the middle cavity in the rotary cover 6, the rotary cover 6 is divided into a hot section and a cold section, and the rotary cover 6 is blown by the first ash removal assembly, the second ash removal assembly 10 and the third ash removal assembly 11, so that the first ash removal assembly and the second ash removal assembly 10 can efficiently wash the hot section, and the second ash removal assembly 10 and the third ash removal assembly 11 can efficiently wash the cold section, avoiding the reduction of blowing pressure, preventing ammonium bisulfate from being blocked on the upper and lower ends of the middle cavity, reducing the heat transfer resistance of the rotary air preheater provided by the embodiment, improving the heat transfer efficiency, and increasing the exhaust gas temperature of the boiler.

[0040] The specific embodiment is only an explanation of the utility model, and is not a limitation of the utility model, and those skilled in the art can make modifications to the embodiment without creative contribution according to the needs after reading the specification, but as long as it is within the protection scope of the utility model, it is protected by the patent law.

Claims

1. A dust cleaning device of a rotary air preheater, comprising a rotating base (1) and an upper beam (2), characterized in that, A movable rotating cover (6) is arranged between the rotating base (1) and the upper beam (2), the rotating cover (6) is provided with a dust cleaning structure (8), and a middle cavity is formed in the rotating cover (6). The dust cleaning structure (8) comprises a first dust cleaning assembly, a second dust cleaning assembly (10) and a third dust cleaning assembly (11), the first dust cleaning assembly and the third dust cleaning assembly (11) are respectively arranged at the upper and lower ends of the rotating cover (6), and the second dust cleaning assembly (10) is arranged in the middle cavity.

2. The dust cleaning device of the rotary air preheater according to claim 1, wherein The first dust cleaning assembly comprises a first swing rod (81) movably arranged on one side of the upper beam (2), a plurality of steam blowers (82) are uniformly arranged on the bottom of the first swing rod (81) along the length direction, and the steam blowers (82) are arranged towards the rotating cover (6).

3. The dust cleaning device of the rotary air preheater according to claim 2, wherein An ultrasonic generator is arranged on the steam inlet pipeline of the steam blower (82), and the ultrasonic generator is used for stripping the dirt on the surface of the rotating cover (6).

4. The dust cleaning device of the rotary air preheater according to claim 3, wherein The first swing rod (81) is provided with a rotating shaft at one end close to the upper beam (2), the rotating shaft is rotatably arranged on one side of the upper beam (2) through a mounting seat, and the rotating shaft is driven by a first driving motor.

5. The dust cleaning device of the rotary air preheater according to claim 4, wherein The first swing rod (81) is provided with a convex shaft (83) at the bottom of the end away from the upper beam (2), the rotating cover (6) is provided with an arc-shaped groove (9) matched with the convex shaft (83), and the lower end of the convex shaft (83) is slidably arranged in the arc-shaped groove (9).

6. The dust cleaning device of the rotary air preheater according to claim 5, wherein The rotating cover (6) comprises an outer shell plate (62) arranged on the rotating base (1); A rotating bearing (61) is arranged at the center of the outer shell plate (62), and a center cylinder is concentrically arranged on the rotating bearing (61); A plurality of partition plates (63) are uniformly arranged between the outer wall of the center cylinder and the inner wall of the rotating bearing (61) in the circumferential direction; A plurality of heat exchange fins (64) are arranged between adjacent two partition plates (63) along the length direction; The middle cavity is arranged between the heat exchange fins (64) to separate the heat exchange fins (64) into an upper heat exchange area and a lower heat exchange area.

7. The dust cleaning device of the rotary air preheater according to claim 6, wherein A driving shaft (7) is arranged in the center cylinder, the driving shaft (7) penetrates the rotating base (1), the rotating cover (6) and the upper beam (2) from bottom to top in sequence, and the driving shaft (7) is driven by a second driving motor.

8. The dust cleaning device of the rotary air preheater according to claim 6, wherein A cross-section flow field sensor (12) is further arranged at the bottom of the outer shell plate (62).

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