Ash discharging device of waste heat boiler

Abstract

The utility model discloses an ash discharge device of a waste heat boiler, which comprises an ash discharge hopper and a scraper, the ash discharge hopper is provided with an ash discharge hopper side plate, and the scraper is provided with a scraper side plate; a first connecting plate is arranged at the bottom of the ash discharge hopper side plate and extends towards the outer side of the ash discharge hopper; a second connecting plate is arranged at the top of the side plate of the scraper, the second connecting plate extends towards the outer side of the scraper, and the first connecting plate and the second connecting plate are connected through a rigid connecting device. The ash discharging device of the waste heat boiler solves the technical problems that in the prior art, an expansion joint between an ash discharging hopper and a scraper is short in service life and prone to damage and ash leakage.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of waste heat boiler, concretely relates to a dust discharging device of waste heat boiler. BACKGROUND

[0002] Waste heat boiler is widely used in non-ferrous smelting industry to recover waste heat in high-temperature flue gas of furnace, and a dust discharging hopper is installed below the waste heat boiler, a scraper is arranged below the dust discharging hopper, and the scraper is fixed to a ground rack. The flue dust and slag in the boiler are discharged into the scraper through the dust discharging hopper and are discharged through the scraper. At present, an expansion joint is used to connect the scraper and the dust discharging hopper, and the expansion joint is used to compensate the expansion of the membrane wall of the waste heat boiler in the vertical direction. When this connection mode is used, the service life of the expansion joint is short, the expansion joint is easy to break and leak dust, and it is difficult to clean after the dust is blocked.

[0003] Chinese utility model patent authorized publication No. CN213513834U discloses a kind of waste incineration waste heat boiler high-temperature fly ash cooling discharge system, it includes water-cooled ash bucket, the first flange is arranged at the ash outlet end of waste heat boiler flue, the second flange is arranged at the ash inlet end of water-cooled ash bucket, multiple bolt holes are uniformly distributed on the first flange and the second flange vertically corresponding, the first flange is fixedly connected with the second flange by the cooperation of bolt and bolt hole, the hole diameter of bolt hole is greater than or equal to the sum of the diameter of corresponding bolt and the expansion deformation amount between flanges, ash pipe is connected at the bottom of water-cooled ash bucket, double-layer flap valve is arranged in the ash pipe. The utility model can effectively cool and discharge high-temperature fly ash through water-cooled ash bucket, increase the bolt hole diameter on the first flange and the second flange used to connect water-cooled ash bucket and waste incineration waste heat boiler flue, can absorb the thermal expansion difference between flanges, prolong the service life of equipment, and additionally set double-layer flap valve on ash pipeline, which is beneficial to the closure of ash pipeline. The utility model absorbs thermal expansion difference by increasing bolt hole diameter, but the thermal expansion difference that can be absorbed by this way is limited. SUMMARY

[0004] In view of the existing technical problems, the utility model aims to provide a dust discharging device of waste heat boiler, which can solve the technical problems of short service life of expansion joint between dust discharging hopper and scraper and easy breakage and dust leakage in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model employs the technical scheme of:

[0006] The utility model provides a kind of ash discharging device of waste heat boiler, including ash discharging hopper and scraper, ash discharging hopper is equipped with ash discharging hopper side plate, scraper is equipped with scraper side plate;Its structural features are: the bottom of the ash discharging hopper side plate is equipped with first connecting plate, which extends to the outside of the ash discharging hopper;The top of the scraper side plate is equipped with second connecting plate, which extends to the outside of the scraper, and the first connecting plate and the second connecting plate are connected by rigid connecting device.

[0007] Ash discharging device uses, the ash in waste heat boiler and slag are discharged to the scraper through the ash discharging hopper, and are discharged through the scraper. Since the scraper is rigidly connected between the scraper and the ash discharging hopper, the scraper is suspended at the bottom of the ash discharging hopper, and the scraper is no longer fixed by the rack. Since the expansion joint between the ash discharging hopper and the scraper is cancelled, compared with the prior art, the vertical height of the bottom of the scraper is increased, so that the scraper can move up and down in the vertical direction with the thermal expansion and contraction of the membrane wall of the waste heat boiler. The ash discharging device of the waste heat boiler of the utility model, the ash discharging hopper and the scraper are rigidly connected, and the thermal expansion and contraction of the membrane wall of the waste heat boiler is compensated by the up and down movement of the scraper, solving the technical problems of short service life and easy damage of the expansion joint.

[0008] Preferably, the rigid connecting device includes a third connecting plate, a connecting rod, and a fastener. The third connecting plate is disposed at the bottom of the second connecting plate, and the third connecting plate abuts against the second connecting plate. The connecting rod penetrates the first connecting plate and the third connecting plate, and the upper end of the connecting rod is fastened by the first fastener, and the lower end of the connecting rod is fastened by the second fastener.

[0009] Preferably, both ends of the connecting rod are provided with threads, and the first fastener and the second fastener are respectively connected to the connecting rod through threads for detachable fixing. The ash discharging device of the waste heat boiler of the utility model has a repeatable dismounting and mounting connecting device, low manufacturing cost, and is convenient for inspection and maintenance.

[0010] Preferably, the top of the first connecting plate is provided with a first backing plate, and the bottom of the third connecting plate is provided with a second backing plate. The connecting rod penetrates the first backing plate, the first connecting plate, the third connecting plate, and the second backing plate in sequence.

[0011] Preferably, a limiting plate is provided on the scraper side plate, the third connecting plate is arranged between the second connecting plate and the limiting plate, and a gap is provided between the limiting plate and the third connecting plate.

[0012] Preferably, a second connecting plate is provided on the scraper side plate of both sides of the scraper, and the second connecting plate extends along the length direction of the scraper. The first connecting plate is arranged circumferentially along the bottom of the ash discharging hopper, a first sealing member is arranged between the first connecting plate and the second connecting plate, and the first connecting plate and the second connecting plate are fixedly connected by a plurality of rigid connecting devices.

[0013] Preferably, the ash discharge hopper extends downward along the height direction and is tapered, and multiple manhole doors are arranged on the side plate of the ash discharge hopper and are arranged in at least two layers along the height direction. Since the expansion joint is cancelled, the vertical height of the bottom of the scraper is increased, the vertical height of the ash discharge hopper can be increased, and at least two layers of manhole doors are arranged, so that the convenience of the ash discharge hopper in maintenance and ash cleaning work is increased.

[0014] Preferably, multiple protection rods are arranged in the inner cavity of the ash discharge hopper, the multiple protection rods are transversely arranged, gaps are arranged between adjacent protection rods, and the multiple protection rods are arranged at the bottom of the lowermost manhole door. The protection rods can effectively prevent the scraper chain from being damaged when the large boiler slag falls.

[0015] Preferably, multiple first reinforcing plates are arranged between the side plate of the ash discharge hopper and the first connecting plate, multiple second reinforcing plates are arranged between the side plate of the scraper and the second connecting plate, and a heat preservation layer is arranged outside the side plate of the ash discharge hopper. The heat preservation layer outside the ash discharge hopper can prevent the ash discharge hopper from dewing, thereby avoiding the ash from being hardened.

[0016] Preferably, the conveying part of the scraper is spliced by multiple conveying units; the ash discharge pipe of the scraper extends into the main ash discharge pipe of the waste heat boiler, and a second sealing element is arranged between the outer wall of the ash discharge pipe and the inner wall of the main ash discharge pipe of the waste heat boiler; and a supporting plate is arranged on the inner wall of the main ash discharge pipe of the waste heat boiler, and the second sealing element is arranged at the top of the supporting plate. The scraper adopts a multi-section splicing design, when ash blocking or equipment failure occurs in the scraper, any conveying unit of the scraper can be individually disassembled, and the scraper is very convenient to maintain. The ash discharge pipe extends into the main ash discharge pipe of the waste heat boiler, which can effectively compensate for the vertical displacement of the scraper.

[0017] Compared with the prior art, the ash discharge device of the waste heat boiler has the following beneficial effects:

[0018] 1. The ash discharge device of the waste heat boiler, the ash discharge hopper and the scraper are rigidly connected, the thermal expansion and contraction of the membrane type wall of the waste heat boiler is compensated by the up-down movement of the scraper, and the technical problems of short service life and easy damage and ash leakage of the expansion joint are solved.

[0019] 2. The ash discharge device of the waste heat boiler, the connecting device can be repeatedly disassembled and assembled, and the manufacturing cost is low.

[0020] 3. The ash discharge device of the waste heat boiler, the vertical height of the ash discharge hopper is increased, and at least two layers of manhole doors are arranged, so that the convenience of the ash discharge hopper in maintenance and ash cleaning work is increased.

[0021] 4. The ash discharge device of the waste heat boiler, the scraper adopts a multi-section splicing design, when ash blocking or equipment failure occurs in the scraper, any conveying unit of the scraper can be individually disassembled, and the scraper is very convenient to maintain. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structure schematic diagram of the ash discharging device of the waste heat boiler of the utility model;

[0023] Figure 2 is Figure 1 a side view structure schematic diagram;

[0024] Figure 3 is Figure 1 a connecting device structure schematic diagram;

[0025] Figure 4 is Figure 1 a scrapper machine ash discharging pipe sample drawing.

[0026] in the drawings

[0027] 1-waste heat boiler membrane wall; 2-waste heat boiler lower header; 3-ash discharging hopper side plate; 4-manhole door; 5-protection rod; 6-thermal insulation layer; 7-rigid connecting device; 8-scrapper machine; 9-ash discharging pipe; 10-waste heat boiler main ash discharging pipe; 11-second sealing element; 12- supporting plate; 13-first connecting plate; 14-second connecting plate; 15-first sealing element; 16-scrapper machine side plate; 17-limiting plate; 18-third connecting plate; 19-connecting rod; 20-first fastener; 21-first backing plate; 22-second fastener; 23-second backing plate; 24-first reinforcing plate; 25-second reinforcing plate; 26-conveying unit; 27-ash discharging hopper. DETAILED DESCRIPTION

[0028] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "up", "down", "left", "right" appear in the following text, they only mean consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure.

[0029] As Figure 1 and Figure 2 shown, the ash discharging device of the waste heat boiler of the embodiment includes an ash discharging hopper 27 and a scrapper machine 8, the ash discharging hopper 27 is equipped with an ash discharging hopper side plate 3, the ash discharging hopper side plate 3 is welded on the lug plate of the waste heat boiler lower header 2 and the flat steel of the waste heat boiler membrane wall 1, and the thermal insulation layer 6 is laid outside the ash discharging hopper side plate 3. The overall material of the ash discharging hopper 27 is made of 304 stainless steel welding, and the material thickness is ≥8mm. The ash discharging hopper 27 extends downward along the height direction and gradually narrows, a plurality of manhole doors 4 are installed on the ash discharging hopper side plate 3, and the manhole doors 4 are arranged in two layers. The manhole door 4 adopts a quick-opening door structure, which is convenient for observing the ash blocking condition inside the ash discharging hopper 27. As Figure 2As shown, the inner cavity of the ash discharge hopper 27 is provided with a plurality of protection rods 5, the plurality of protection rods 5 are all transversely arranged, the gap between adjacent protection rods 5 is 0.2-0.5m, and the plurality of protection rods 5 are all arranged at the bottom of the lowermost manhole door 4. Figure 1 and Figure 4 As shown, the conveying part of the scraper 8 is spliced by a plurality of conveying units 26, and the scraper 8 is provided with an ash pipe 9 at the machine head, the ash pipe 9 extends into the main ash pipe 10 of the waste heat boiler to form a sleeved connection ash discharge mode. The gap between the ash pipe 9 and the main ash pipe 10 of the waste heat boiler is filled with a second sealing member 11 for sealing, and the second sealing member 11 is made of aluminum silicate fiber felt. The inner wall of the main ash pipe 10 of the waste heat boiler is welded with a supporting plate 12 for supporting the second sealing member 11.

[0030] As shown in Figure 1 and Figure 3 The ash discharge hopper 27 is connected with the scraper 8 through the rigid connecting device 7, and the scraper 8 is not provided with a rack below and is suspended at the bottom of the ash discharge hopper 27. The bottom of the side plate 3 of the ash discharge hopper is provided with a first connecting plate 13, which extends outward from the ash discharge hopper 27. The first connecting plate 13 is made of δ≥12mm stainless steel plate by welding, and bolt holes are opened on the first connecting plate 13 every 0.3-0.8m along the length direction. The scraper 8 is provided with a scraper side plate 16 on both sides along the length direction, and the top of the scraper side plate 16 is provided with a second connecting plate 14, which is made of a flange, and the second connecting plate 14 extends outward from the scraper 8. The first connecting plate 13 and the second connecting plate 14 are fixedly connected through the rigid connecting device 7, and the contact surface of the first connecting plate 13 and the second connecting plate 14 is filled with a first sealing member 15 for sealing, and the first sealing member 15 is made of asbestos rope. A limiting plate 17 is welded on the side surface of the scraper side plate every 0.3-0.8m along the length direction, and the position of the limiting plate 17 corresponds to the position of the bolt hole on the first connecting plate 13. Figure 3As shown, the rigid connecting device 7 comprises a first pad plate 21, a second pad plate 23, a third connecting plate 18, a connecting rod 19, a first fastener 20 and a second fastener 22. The third connecting plate 18 is arranged at the bottom of the second connecting plate 14, and the third connecting plate 18 abuts against the second connecting plate 14 and the scraper machine side plate 16. The limiting plate 17 is arranged below the third connecting plate 18, and a gap is arranged between the limiting plate 17 and the third connecting plate 18. The second pad plate 23 is arranged at the bottom of the third connecting plate 18, and the first pad plate 21 is arranged at the top of the first connecting plate 13. The third connecting plate 18 is provided with bolt holes, and the connecting rod 19 penetrates the bolt holes of the first pad plate 21, the first connecting plate 13, the third connecting plate 18 and the second pad plate 23 in sequence, and the two ends of the connecting rod 19 are fastened by the first fastener 20 and the second fastener 22 respectively. The connecting rod 19 adopts a high-strength bolt, and the specification of the high-strength bolt is preferably ≥M20. The first fastener 20 and the second fastener 22 both adopt a nut, which cooperates with the high-strength bolt. The first reinforcing plate 24 is welded between the ash bucket side plate 3 and the first connecting plate 13 every 0.3-0.8 m, and the second reinforcing plate 25 is welded between the second connecting plate 14 and the scraper machine side plate 16 every 0.3-0.8 m, and the first reinforcing plate 24 and the second reinforcing plate 25 both adopt stiffened rib plates.

[0031] In operation, the waste heat boiler ash falls into the scraper machine 8 through the ash bucket 27, and the protection rod 5 plays a buffering role, which can effectively prevent the scraper machine 8 from being damaged by the falling of large pieces of boiler slag. The heat preservation layer 6 outside the ash bucket 27 can prevent condensation inside the ash bucket 27 and avoid the hardening of the ash. The scraper machine 8 is suspended at the lower end of the ash bucket 27 through the rigid connecting device 7, so that the scraper machine 8 can freely move up and down along the vertical direction with the thermal expansion and contraction of the waste heat boiler membrane wall 1. The scraper machine 8 is connected in multiple sections, so that any section can be individually removed for maintenance. The ash discharge pipe 9 is inserted into the main ash discharge pipe 10 of the waste heat boiler to form a sleeve connection, which can effectively compensate for the vertical displacement of the scraper machine 8. The second sealing member 11 fills the gap between the ash discharge pipe 9 and the main ash discharge pipe 10 of the waste heat boiler, and plays a sealing role to avoid leakage of the ash and the flue gas.

[0032] The content illustrated in the above embodiments should be understood as that the embodiments are only used to more clearly illustrate the utility model, and are not used to limit the scope of the utility model. After reading the utility model, various equivalent modifications of the embodiments made by those skilled in the art all fall within the scope defined by the claims of the utility model.

Claims

1. An ash removal device of a waste heat boiler, which comprises an ash removal hopper (27) and a flight bar machine (8), the ash removal hopper (27) being equipped with an ash removal hopper side plate (3) and the flight bar machine (8) being equipped with a flight bar machine side plate (16); characterized in that: The bottom of the ash discharge hopper side plate (3) is provided with a first connecting plate (13) extending outward from the ash discharge hopper (27); the top of the scraper machine side plate (16) is provided with a second connecting plate (14) extending outward from the scraper machine (8); the first connecting plate (13) and the second connecting plate (14) are connected by a rigid connecting device (7).

2. The ash discharging device of a waste heat boiler according to claim 1, characterized in that: The rigid connecting device (7) comprises a third connecting plate (18), a connecting rod (19), a first fastener (20) and a second fastener (22); the third connecting plate (18) is arranged at the bottom of the second connecting plate (14), and the third connecting plate (18) abuts against the second connecting plate (14); the connecting rod (19) penetrates the first connecting plate (13) and the third connecting plate (18), and the upper end of the connecting rod (19) is fastened by the first fastener (20), and the lower end of the connecting rod (19) is fastened by the second fastener (22).

3. The ash discharging device of a waste heat boiler according to claim 2, characterized in that: Both ends of the connecting rod (19) are provided with threads, and the first fastener (20) and the second fastener (22) are respectively connected to the connecting rod (19) by thread detachable fixing.

4. The ash discharging device of a waste heat boiler according to claim 2, characterized in that: The top of the first connecting plate (13) is provided with a first backing plate (21), and the bottom of the third connecting plate (18) is provided with a second backing plate (23); the connecting rod (19) penetrates the first backing plate (21), the first connecting plate (13), the third connecting plate (18) and the second backing plate (23) in sequence.

5. The ash discharging device of a waste heat boiler according to claim 2, characterized in that: The scraper machine side plate (16) is provided with a limiting plate (17), the third connecting plate (18) is arranged between the second connecting plate (14) and the limiting plate (17), and a gap is arranged between the limiting plate (17) and the third connecting plate (18).

6. The ash discharging device of a waste heat boiler according to claim 2, characterized in that: The scraper machine side plate (16) on both sides of the scraper machine (8) is provided with a second connecting plate (14) extending along the length direction of the scraper machine (8); the first connecting plate (13) is arranged along the circumference of the bottom of the ash discharge hopper (27), a first sealing element (15) is arranged between the first connecting plate (13) and the second connecting plate (14), and the first connecting plate (13) and the second connecting plate (14) are fixedly connected by a plurality of rigid connecting devices (7).

7. The ash discharging device of a waste heat boiler according to claim 1, characterized in that: The ash discharge hopper (27) extends downward along the height direction and gradually narrows, and a plurality of manhole doors (4) are arranged on the ash discharge hopper side plate (3), and the plurality of manhole doors (4) are arranged in at least two layers along the height direction.

8. The ash removal device of a waste heat boiler according to claim 7, characterized in that A plurality of protection rods (5) are arranged in the inner cavity of the ash discharge hopper (27), the plurality of protection rods (5) are arranged transversely, gaps are arranged between adjacent protection rods (5), and the plurality of protection rods (5) are arranged at the bottom of the lowermost manhole door (4).

9. The ash discharging device of a waste heat boiler according to any one of claims 1 to 8, characterized in that: A plurality of first reinforcing plates (24) are arranged between the ash discharge hopper side plate (3) and the first connecting plate (13), a plurality of second reinforcing plates (25) are arranged between the scraper machine side plate (16) and the second connecting plate (14), and a heat preservation layer (6) is arranged on the outside of the ash discharge hopper side plate (3).

10. The ash removal device of a waste heat boiler according to any one of claims 1 to 8, characterized in that: The conveying part of the scraper machine (8) is spliced by multiple conveying units (26); the ash pipe (9) of the scraper machine (8) extends into the main ash pipe (10) of the waste heat boiler, and a second sealing element (11) is arranged between the outer wall of the ash pipe (9) and the inner wall of the main ash pipe (10) of the waste heat boiler; a supporting plate (12) is arranged on the inner wall of the main ash pipe (10) of the waste heat boiler, and the second sealing element (11) is arranged on the top of the supporting plate (12).

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