Positive pressure dust-containing flue gas vertical air preheater

Abstract

A positive-pressure vertical air preheater for dust-containing flue gas relates to the technical field of heat exchangers, and adopts the technical scheme that the positive-pressure vertical air preheater comprises a barrel body, a first cavity and two second cavities are formed in the barrel body, and the barrel body, the first cavity and the second cavities extend upwards; a flue gas inlet is formed in the top of the first cavity, an ash collecting hopper is connected to the bottom of the first cavity, a flue gas outlet is formed in the side wall of the ash collecting hopper, and an ash discharging valve is arranged at the bottom of the ash collecting hopper; the second cavity is provided with a plurality of third cavities, the first cavity is sequentially provided with a plurality of heat exchange tube sets from top to bottom, and the multiple third cavities on the two sides of the first cavity are sequentially communicated through the multiple heat exchange tube sets to form an S-shaped air flow channel; a supporting frame is further arranged around the cylinder body. According to the utility model, the plurality of heat exchange tube groups repeatedly penetrate through the first cavity to complete heat exchange; during normal work, the ash discharge valve is closed to avoid leakage of dust-containing flue gas so as to adapt to a positive pressure environment; the barrel body, the first cavity and the second cavity all extend upwards to form a vertical structure, and the occupied area is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a vertical air preheater for positive-pressure dusty flue gas. Background Technique

[0002] After the industrial sulfur (solid or liquid) in the sulfuric acid industry is roasted, flue gas containing high dust and sulfur dioxide is generated. Its temperature is between 700 and 1100 °C. It enters the waste heat boiler for heat exchange, absorbs the waste heat in the flue gas, converts the water in the boiler into high-pressure steam for power generation or industrial production steam, and at the same time reduces the dust content in the flue gas. The dusty flue gas still has medium and low-temperature waste heat that can be utilized after heat exchange in the waste heat boiler. Generally, an air preheater is used to preheat the air with the medium and low-temperature waste heat, and then the air is sent to the sulfur-burning furnace. At present, the air preheater is usually of a horizontal structure. With the increase in the processing capacity, its floor area is getting larger and larger, which is not conducive to the plant planning and design. Content of the Utility Model

[0003] Aiming at the problem of the large floor area of the horizontal air preheater in the prior art solution, the utility model provides a vertical air preheater for positive-pressure dusty flue gas.

[0004] The utility model provides the following technical solution: A vertical air preheater for positive-pressure dusty flue gas, including a cylinder body. Two tube plates are arranged inside the cylinder body to divide the inner cavity of the cylinder body into a first cavity and two second cavities. The two second cavities are respectively arranged on both sides of the first cavity. The cylinder body, the first cavity, and the second cavity all extend upward;

[0005] A flue gas inlet is arranged at the top of the first cavity. A dust collecting hopper is connected to the bottom of the first cavity. A flue gas outlet is arranged on the side wall of the dust collecting hopper. A dust discharge valve is arranged at the bottom of the dust collecting hopper;

[0006] A plurality of partition plates are arranged in the second cavity to divide the second cavity into a plurality of third cavities. A plurality of heat exchange tube groups are arranged in the first cavity from top to bottom in sequence. The plurality of heat exchange tube groups sequentially connect the plurality of third cavities on both sides of the first cavity to form an S-shaped air flow channel. An air inlet is arranged in the third cavity close to the flue gas outlet, and an air outlet is arranged in the third cavity close to the flue gas inlet;

[0007] A support frame is further arranged around the cylinder body. The support frame is provided with a support platform and a plurality of maintenance platforms. The cylinder body is connected to the support platform and the maintenance platforms through legs.

[0008] Preferably, the cylinder body is further provided with a plurality of inspection openings communicating with the first cavity, and the inspection openings are located between adjacent two heat exchange tube groups.

[0009] Preferably, a maintenance platform is arranged below each inspection opening.

[0010] Preferably, a head is further provided at the top of the barrel body, the interior of the head is communicated with the first cavity, and the flue gas inlet is provided on the head.

[0011] Preferably, the inspection opening is also provided on the head.

[0012] Preferably, the partition plate includes a first partition plate and a second partition plate. At least one first partition plate is provided in one second cavity, and at least one second partition plate is provided in the other second cavity. The first partition plate and the second partition plate are arranged at intervals from bottom to top, and the first partition plate or the second partition plate is provided between adjacent two heat exchange tube groups.

[0013] Preferably, a heat insulation layer is further provided on the barrel body.

[0014] The beneficial effects of the present utility model are as follows: Low-temperature air enters from the air inlet, flows reversely with the dusty flue gas through the S-shaped air flow path, and is discharged from the air outlet at the top. It completes heat exchange by passing through the first cavity repeatedly through multiple heat exchange tube groups; when working normally, the ash discharge valve is closed to avoid leakage of the dusty flue gas to adapt to the positive pressure environment; the barrel body, the first cavity, and the second cavity all extend upward to form a vertical structure, reducing the floor area, and the support frame bears the load of the barrel body and maintains the stability of the barrel body. Description of the Drawings

[0015] Figure 1 It is a schematic cross-sectional view of an embodiment of a vertical air preheater.

[0016] Figure 2 It is a cross-sectional view of an embodiment of the barrel body.

[0017] Reference Signs: 10, barrel body; 11, tube sheet; 12, inspection opening; 13, head; 14, heat insulation layer; 20, first cavity; 21, flue gas inlet; 22, ash hopper; 23, flue gas outlet; 24, ash discharge valve; 30, second cavity; 31, third cavity; 32, air inlet; 33, air outlet; 34, first partition plate; 35, second partition plate; 40, heat exchange tube group; 50, support frame; 51, support platform; 52, maintenance platform. Detailed Embodiments

[0018] The following further describes the embodiments of the present utility model in more detail with reference to the drawings and reference signs, so that those skilled in the art can implement it after studying this specification. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0019] The present utility model provides as Figure 1-2The positive pressure dusty flue gas vertical air preheater shown in the figure comprises a barrel 10, wherein two tube sheets 11 are arranged inside the barrel 10 to divide the inner cavity of the barrel 10 into a first cavity 20 and two second cavities 30, and the two second cavities 30 are respectively arranged on both sides of the first cavity 20. The barrel 10, the first cavity 20, and the second cavity 30 all extend upward. Figure 1 As shown, the cylinder body 10, the first cavity 20, and the second cavity 30 all extend upward in the vertical direction to form a vertical structure to reduce the floor space and facilitate plant planning and design. A head 13 is provided on the top of the cylinder body 10, and the head 13 closes the tops of the two second cavities 30 and communicates with the first cavity 20, and the head 13 is provided with a smoke inlet 21; an ash hopper 22 is provided at the bottom of the cylinder body 10, specifically, the ash hopper 22 is connected to the bottom of the first cavity 20, and a smoke outlet 23 is provided on its side wall, and an ash discharge valve 24 is provided at the bottom of the ash hopper 22.

[0020] The first cavity 20 is a flue gas flow passage. Dust-containing flue gas enters the first cavity 20 from the flue gas inlet 21 under the action of positive pressure, passes through the first cavity 20 and is discharged from the flue gas outlet 23 to the next process. The fallen dust enters the ash hopper 22, and a part of it is regularly discharged from the ash discharge valve 24, which will not cause leakage of dust-containing flue gas. During normal operation, the ash discharge valve 24 is closed to prevent leakage of dust-containing flue gas to adapt to the positive pressure environment.

[0021] The second cavity 30 is provided with a plurality of partitions to divide the second cavity 30 into a plurality of third cavities 31. The first cavity 20 is provided with a plurality of heat exchange tube groups 40 from top to bottom. The plurality of heat exchange tube groups 40 connect the plurality of third cavities 31 on both sides of the first cavity 20 in sequence to form an S-shaped air flow channel. The third cavity 31 near the smoke outlet 23 is provided with an air inlet 32, and the third cavity 31 near the smoke inlet 21 is provided with an air outlet 33.

[0022] The low-temperature air enters from the air inlet 32, flows in the opposite direction to the dusty flue gas through the S-shaped air flow channel, and is discharged from the top air outlet 33 to the next process. It repeatedly passes through the first cavity 20 through multiple heat exchange tube groups 40 to exchange heat, transferring the heat in the dusty flue gas to the low-temperature air. The air flow direction in the air flow channel is as follows: Figure 1 As shown by the arrow. The barrel 10 is also provided with an insulation layer 14 to minimize heat loss. The barrel 10 is also provided with a plurality of inspection ports 12 connected to the first cavity 20, the inspection ports 12 are located between two adjacent heat exchange tube groups 40, and the head 13 is also provided with an inspection port 12, which is convenient for workers to enter the first cavity to clean the dust on the heat exchange tubes to avoid reducing the heat exchange efficiency.

[0023] Specifically, the heat exchange tube group 40 is multiple heat exchange tubes distributed in an array. In the attached drawings, for the sake of a simplified view, only the heat exchange tubes at the edge are shown. The partition plates include a first partition plate 34 and a second partition plate 35. Please refer to Figure 1 , there are 2 first partition plates 34 provided in the second cavity 30 on the left side of the first cavity 20, and 1 second partition plate 35 provided in the second cavity 30 on the right side of the first cavity 20. The first partition plate 34 and the second partition plate 35 are arranged at intervals from bottom to top, and the first partition plate 34 or the second partition plate 35 is arranged between adjacent two heat exchange tube groups 40, so that the air flow passage forms an S-shaped structure.

[0024] Since the height of the cylinder body 10 is relatively high, a support frame 50 is further provided around the cylinder body 10 to bear the load of the cylinder body and maintain the stability of the cylinder body. The support frame 50 includes a concrete foundation and a steel frame structure arranged on the concrete foundation, and the steel frame structure surrounds the cylinder body. The support frame 50 is provided with a support platform 51 and multiple maintenance platforms 52. The cylinder body 10 is connected to the support platform 51 and the maintenance platforms 52 through legs. The support platform 51 is generally a concrete platform connected to the concrete foundation and bears most of the load; the maintenance platforms 52 generally adopt a steel frame structure. Multiple maintenance platforms 52 are arranged in sequence from low to high, and one maintenance platform 52 is provided below each inspection opening 12. The multiple maintenance platforms 52 and the support platform 51 are connected by steps.

[0025] The above are one or more embodiments of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A positive-pressure dust-containing flue gas vertical air preheater, characterized in that, It includes a cylinder body, and two tube sheets are arranged inside the cylinder body to divide the inner cavity of the cylinder body into a first cavity and two second cavities. The two second cavities are respectively arranged on both sides of the first cavity, and the cylinder body, the first cavity, and the second cavities all extend upward; A flue gas inlet is arranged at the top of the first cavity, a dust hopper is connected to the bottom of the first cavity, a flue gas outlet is arranged on the side wall of the dust hopper, and a dust discharge valve is arranged at the bottom of the dust hopper; A plurality of partition plates are arranged in the second cavity to divide the second cavity into a plurality of third cavities. A plurality of heat exchange tube groups are arranged in the first cavity from top to bottom in sequence. The plurality of heat exchange tube groups connect the plurality of third cavities on both sides of the first cavity in sequence to form an S-shaped air flow channel. An air inlet is arranged in the third cavity close to the flue gas outlet, and an air outlet is arranged in the third cavity close to the flue gas inlet; A support frame is further arranged around the cylinder body. The support frame is provided with a support platform and a plurality of maintenance platforms. The cylinder body is connected to the support platform and the maintenance platforms through legs.

2. The vertical air preheater for positive-pressure dusty flue gas according to claim 1, characterized in that, A plurality of inspection openings communicated with the first cavity are further arranged on the cylinder body, and the inspection openings are located between two adjacent heat exchange tube groups.

3. The vertical air preheater for positive-pressure dusty flue gas according to claim 2, characterized in that, A maintenance platform is arranged below each inspection opening.

4. A positive-pressure dust-containing flue gas vertical air preheater according to claim 2, characterized in that, A head is further arranged at the top of the cylinder body. The inside of the head is communicated with the first cavity, and the head is provided with the flue gas inlet.

5. The vertical air preheater for positive-pressure dusty flue gas according to claim 4, characterized in that, The head is also provided with the inspection opening.

6. The vertical air preheater for positive-pressure dusty flue gas according to claim 1, wherein, The partition plates include a first partition plate and a second partition plate. At least one first partition plate is arranged in one second cavity, and at least one second partition plate is arranged in the other second cavity. The first partition plate and the second partition plate are arranged at intervals from bottom to top, and the first partition plate or the second partition plate is arranged between two adjacent heat exchange tube groups.

7. The vertical air preheater for positive-pressure dusty flue gas according to claim 1, characterized in that, The cylinder body is also provided with a heat insulation layer.

Images