Dry quenching waste heat boiler adopting finned tube structure evaporator

Abstract

The utility model discloses a dry quenching waste heat boiler adopting an evaporator with a finned tube structure, which comprises a flue, a water cooling wall is arranged in the flue, and a preset evaporator, a high-temperature superheater, a low-temperature superheater, a finned tube evaporator I, a finned tube evaporator II and a finned tube economizer are sequentially arranged in the flue from top to bottom. The finned tube evaporator I and the finned tube evaporator II are arranged in a finned tube mode, and two rows of finned tubes are arranged on the windward sides of the finned tube evaporator I and the finned tube evaporator II in a staggered mode and provided with anti-abrasion cover plates. The evaporator completely adopts the finned tube structure, and fins with high heat exchange efficiency are used for heat exchange, so that metal consumables of the boiler are saved, and the cost is reduced; due to dual protection of the fins and the anti-abrasion cover plate, the surface of a light pipe on the heating surface of the evaporator is prevented from directly colliding with dust particles in smoke, and the service life of the evaporator is prolonged; according to the evaporator with the finned tube structure, the number of rows of light tubes of the evaporator is reduced, so that the height of a water cooling wall is reduced, and boiler metal consumables and resources are saved.

Description

Technical Field

[0001] This utility model relates to the field of dry quenching coke waste heat boiler technology, and in particular to a dry quenching coke waste heat boiler using a finned tube evaporator. Background Technology

[0002] A dry quenching coke waste heat boiler refers to a dry quenching furnace that uses inert gas to cool red-hot coke. Under the action of a circulating fan, the inert gas cools the red-hot coke at around 1000°C in the dry quenching furnace. The inert gas, which absorbs the sensible heat of the coke, is heated and then enters the dry quenching coke waste heat boiler after being removed by a primary dust collector. The high-temperature inert gas at the inlet of the dry quenching coke waste heat boiler is 900-980°C. The high-temperature inert gas exchanges heat with the steam and water in the dry quenching coke waste heat boiler, and its temperature drops to 160-180°C. After passing through a secondary dust collector, a circulating fan, and an auxiliary economizer, the temperature drops to 130°C before entering the dry quenching furnace to cool the red-hot coke.

[0003] Existing dry quenching waste heat boilers have some drawbacks: the evaporators in dry quenching waste heat boilers on the market all use bare tube structures. Since the heat exchange area of ​​the tubes is much smaller than that of the fins, the metal consumption of the boiler increases; the boiler water-cooled walls are increased in height to accommodate the heating surface of the bare tube evaporator; the high-temperature flue gas in dry quenching waste heat boilers contains a large number of coke particles, and the surface of the bare tube evaporator heating surface collides directly with the coke particles in the flue gas, making the tube wall surface prone to wear and seriously affecting the service life of the waste heat boiler. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model designs a dry quenching waste heat boiler with a finned tube evaporator structure. The finned tube evaporator structure reduces the consumption of boiler metal materials and prevents coke particles from damaging the evaporator components.

[0005] The present invention adopts the following technical solution:

[0006] A dry quenching waste heat boiler employing a finned tube evaporator includes a flue with water-cooled walls arranged inside. From top to bottom, the flue contains a pre-installed evaporator, a high-temperature superheater, a low-temperature superheater, a finned tube evaporator I, a finned tube evaporator II, and a finned tube economizer. The finned tube evaporators I and II are arranged with finned tubes, and two rows of staggered finned tubes on the windward side of the finned tube evaporators I and II are fitted with wear-resistant covers.

[0007] Preferably, the wear-resistant cover is arranged at a 70° angle.

[0008] Preferably, the cross-sectional shape of the wear-resistant cover is tile-shaped.

[0009] Preferably, the water-cooled wall includes a front water-cooled wall, a rear water-cooled wall, and a side water-cooled wall.

[0010] Preferably, the finned tube extends from the front wall water-cooled wall through the rear wall water-cooled wall, and the finned tube is arranged horizontally upward at a 5° angle.

[0011] Preferably, the pre-installed evaporator, high-temperature superheater, low-temperature superheater, finned tube evaporator I, and finned tube evaporator II are suspended sequentially by hanging pipes, and a notch is made at the contact point between the wear-resistant cover plate and the hanging pipe.

[0012] Preferably, the finned tube evaporator I is connected to the hanging tube by a support plate, and no fins are provided at the connection between the finned tube evaporator I and the hanging tube.

[0013] Preferably, the wear-resistant cover plate is distributed in sections, and adjacent wear-resistant cover plates are connected by wear-resistant tiles.

[0014] Preferably, the finned tube evaporator II is suspended on the lower header of the hanging tube via a connecting plate.

[0015] Preferably, the surface of the finned tube adopts a spiral finned tube structure.

[0016] The beneficial effects of this utility model are: (1) The evaporator adopts a finned tube structure throughout, which uses finned heat exchange with high heat exchange efficiency to save boiler metal consumables and thus reduce costs; (2) The double protection of fins and anti-wear cover plate avoids the surface of the evaporator heating surface bare tube from directly colliding with dust particles in the flue gas, thus extending the service life of the evaporator; (3) The finned tube structure of the evaporator reduces the number of bare tube rows in the evaporator, thereby reducing the height of the water-cooled wall, saving boiler metal consumables and conserving resources. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is the finned tube evaporator of the present invention.

[0019] Figure 3 This is a partial structural schematic diagram of the finned tube evaporator II of this utility model;

[0020] Figure 4 This is a partial structural diagram of the finned tube evaporator I and the hanging tube of this utility model;

[0021] Figure 5 This is a partial structural diagram of the anti-wear cover plate for the finned tube evaporator of this utility model;

[0022] Figure 6 This is a partial structural diagram of the finned tube evaporator II and the hanging tube of this utility model;

[0023] In the diagram: 1. Front water-cooled wall; 2. Rear water-cooled wall; 3. Side water-cooled wall; 4. Pre-installed evaporator; 5. High-temperature superheater; 6. Low-temperature superheater; 7. Finned tube evaporator I; 8. Finned tube evaporator II; 9. Finned tube economizer; 10. Hanging tube; 11. Wear-resistant cover plate; 12. Wear-resistant tile plate; 13. Connecting plate. Detailed Implementation

[0024] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0025] Example: Figure 1 As shown, a dry quenching waste heat boiler using a finned tube evaporator includes a front water-cooled wall 1, a rear water-cooled wall 2, a side water-cooled wall 3, a pre-installed evaporator 4, a high-temperature superheater 5, a low-temperature superheater 6, a finned tube evaporator I 7, a finned tube evaporator II 8, a finned tube economizer 9, and a hanging tube 10.

[0026] like Figure 2 , Figure 3 As shown, finned tube evaporators I7 and II8 employ a finned tube arrangement. On the windward side of finned tube evaporators I7 and II8, two rows of finned tubes are staggered and fitted with 70° inclined anti-wear covers 11 to prevent collisions between the evaporator tube wall surface and dust particles in the flue gas, thus extending the tube wall's service life. The finned tubes extend from the front water-cooled wall through the rear water-cooled wall, with a horizontal inclination of 5°. This facilitates the circulation of the steam-water mixture within the finned tubes, preventing stratification and thus avoiding heat transfer deterioration.

[0027] The cross-sectional shape of the wear-resistant cover is tile-shaped. At the contact point between the wear-resistant cover and the hanging pipe, the wear-resistant cover has a notch cut to protect the hanging pipe from wear caused by high-temperature flue gas and dust.

[0028] like Figure 4 As shown, at the connection between the finned tube evaporator I7 and the hanging tube 10, the finned tube evaporator I7 has a 100mm gap without fins. The finned tube evaporator I7 and the hanging tube 10 are connected by a support plate, allowing the finned tube evaporator I7 to move freely and expand without obstruction.

[0029] like Figure 5 As shown, the finned tube evaporator I7 and the finned tube evaporator II8 have two staggered rows of wear-resistant cover plates 11 with a length of about 1m laid on their windward sides. The wear-resistant cover plates are connected to each other by wear-resistant tiles 12. One end of the wear-resistant tile 12 is welded to the wear-resistant cover plate 11, while the other end is not welded to avoid obstruction of the expansion of the wear-resistant cover plate.

[0030] The heat exchange surface tubes of finned tube evaporators I and II are made of Φ42 diameter tubes with a spiral finned tube structure. The fin thickness is 1mm and the fin height is 16mm. The use of high heat exchange efficiency fins saves on boiler metal consumables, thereby reducing costs.

[0031] like Figure 6 As shown, the finned tube evaporator II8 is suspended on the lower header of the hanging pipe 10 via the connecting plate 13, so that the finned tube evaporator II8 is subjected to uniform force and can expand freely.

[0032] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A dry quenching waste heat boiler employing a finned tube evaporator, comprising a flue with water-cooled walls arranged within it, characterized in that... The flue contains, from top to bottom, a pre-installed evaporator, a high-temperature superheater, a low-temperature superheater, a finned tube evaporator I, a finned tube evaporator II, and a finned tube economizer. The finned tube evaporators I and II are arranged with finned tubes, and the windward sides of the finned tube evaporators I and II are provided with two staggered rows of finned tubes and anti-wear covers.

2. A dry quenching waste heat boiler employing a finned tube evaporator according to claim 1, characterized in that, The wear-resistant cover plate is arranged at a 70° angle.

3. A dry quenching waste heat boiler employing a finned tube evaporator according to claim 1, characterized in that, The cross-sectional shape of the wear-resistant cover plate is tile-shaped.

4. A dry quenching waste heat boiler employing a finned tube evaporator according to claim 1, characterized in that, The water-cooled wall includes a front water-cooled wall, a rear water-cooled wall, and a side water-cooled wall.

5. A dry quenching waste heat boiler employing a finned tube evaporator according to claim 4, characterized in that, The finned tubes extend from the front wall water-cooled wall through the rear wall water-cooled wall, and are arranged horizontally upward at a 5° angle.

6. A dry quenching waste heat boiler employing a finned tube evaporator according to claim 1, characterized in that, The pre-installed evaporator, high-temperature superheater, low-temperature superheater, finned tube evaporator I, and finned tube evaporator II are suspended sequentially by hanging pipes, and a notch is made at the contact point between the wear-resistant cover plate and the hanging pipe.

7. A dry quenching waste heat boiler employing a finned tube evaporator according to claim 6, characterized in that, The finned tube evaporator I is connected to the hanging tube by a support plate, and there are no fins at the connection between the finned tube evaporator I and the hanging tube.

8. A dry quenching waste heat boiler employing a finned tube evaporator according to claim 1, characterized in that, The wear-resistant cover plates are distributed in sections, and adjacent wear-resistant cover plates are connected by wear-resistant tiles.

9. A dry quenching waste heat boiler employing a finned tube evaporator according to claim 6, characterized in that, The finned tube evaporator II is suspended on the lower header of the hanging pipe via a connecting plate.

10. A dry quenching waste heat boiler employing a finned tube evaporator according to claim 1, characterized in that, The surface of the finned tube adopts a spiral finned tube structure.

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