Superheater with high heat exchange efficiency for boiler
By installing a scraper system on the outside of the bent pipe and improving the flue gas flow path, the problem of low heat exchange efficiency caused by dust cover was solved, and efficient steam and flue gas heat exchange was achieved.
Patent Information
- Application Number
- CN202423065284.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-12
AI Technical Summary
In existing boiler superheaters, dust layers in the flue gas cover the outer wall of the bend tubes, reducing the heat exchange efficiency between steam and flue gas. Furthermore, the small contact area between the flue gas and the bend tubes leads to prolonged steam heating time and low heat exchange efficiency.
A front scraper and a rear scraper are installed on the outside of the bent pipe. The scraper has a semi-circular hole that fits with the outer wall of the bent pipe. The scraper is driven by a linear cylinder to remove the dust layer, and two valves are used to disperse the flue gas in the inner cavity of the heat insulation shell to increase the contact area.
It effectively removes the dust layer on the outer wall of the bent pipe, improves the heat exchange efficiency between steam and flue gas, shortens the steam heating time, and enhances the heat exchange effect.
Smart Images
Figure CN223499539U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of heat exchanger structure, and in particular to a boiler superheater with high heat exchange efficiency. Background Technology
[0002] The function of a superheater is to use the hot flue gas discharged from the boiler to heat the steam discharged from the boiler, so as to obtain steam at a higher temperature. This high-temperature steam can be sent to the power generation system to generate electricity.
[0003] The structure of the superheater used in a certain region is as follows: Figure 1 As shown, it includes a heat insulation shell 1, a flue pipe 2 fixed to the top of the heat insulation shell 1, and a valve 3 fixed to the left side wall of the heat insulation shell 1. A heat exchange tube is installed inside the heat insulation shell 1. The heat exchange tube includes a bent pipe 4, a steam discharge pipe 5 and a steam inlet pipe 6 respectively fixed to both ends of the bent pipe 4. The steam discharge pipe 5 passes through the top wall of the heat insulation shell 1 upwards, and the steam inlet pipe 6 passes through the right side wall of the heat insulation shell 1 to the right. A through groove is opened on the bottom wall of the heat insulation shell 1, and a cover plate 7 is connected to the bottom surface of the through groove by screws.
[0004] The superheater heats steam in the following way:
[0005] S1. The worker introduces the flue gas discharged from the boiler into valve 3. The flue gas passes sequentially through valve 3, the inner cavity of insulation shell 1, and finally is discharged into the next treatment process through exhaust pipe 2. The flow direction of the flue gas is as follows: Figure 2 As indicated by the solid arrow in the center;
[0006] S2. The steam discharged from the boiler is introduced into the steam inlet pipe 6. The steam flows sequentially through the steam inlet pipe 6, the bend pipe 4, and the steam outlet pipe 5, finally entering the subsequent power generation system. The steam flow direction is as follows: Figure 2 As shown by the hollow arrow, when the steam flows through the bend pipe 4, the flue gas entering the insulation shell 1 exchanges heat with the steam in the bend pipe 4, thereby heating the steam flowing through the bend pipe 4. After the heated steam enters the power generation system, steam power generation can be realized.
[0007] However, due to the dust contained in the flue gas, a layer of dust accumulates on the outer wall of the bend tube 4 after the superheater has been operating for a period of time. This dust layer covers the bend tube 4, reducing the heat exchange efficiency between steam and flue gas. Furthermore, since the flue gas can only enter the inner cavity of the insulation shell 1 through valve 3, it is not widely dispersed within the insulation shell 1. This results in a small contact area between the flue gas and the bend tube 4, requiring a long time to heat the steam inside the bend tube 4, further reducing the heat exchange efficiency between steam and flue gas.
[0008] Therefore, there is an urgent need for a boiler superheater that can greatly improve the heat exchange efficiency between steam and flue gas. Utility Model Content
[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide a boiler superheater with high heat exchange efficiency that greatly improves the heat exchange efficiency between steam and flue gas.
[0010] The purpose of this utility model is achieved through the following technical solution: a boiler superheater with high heat exchange efficiency, comprising an insulation shell, a flue pipe fixed to the top of the insulation shell, and a heat exchange tube inside the insulation shell. The heat exchange tube includes a bent pipe, a steam discharge pipe and a steam inlet pipe respectively fixed to both ends of the bent pipe. The steam discharge pipe extends upward through the top wall of the insulation shell, and the steam inlet pipe extends to the right through the right side wall of the insulation shell. Valves are connected to both the left and right side walls of the insulation shell. The inner ports of the two valves are connected to the inner cavity of the insulation shell. Branch pipes are connected to the outer ports of the two valves. A main flue gas inlet pipe is fixed between the two branch pipes. The left end of the main flue gas inlet pipe is closed.
[0011] The bent tube is externally fitted with a front scraper and a rear scraper. Multiple opposing semi-circular holes are provided on the inner end faces of the front and rear scrapers. The semi-circular holes in the front and rear scrapers are matched with the outer wall of the bent tube. A linear cylinder is also fixed on the left side wall of the heat insulation shell. The piston rod of the linear cylinder passes through the left side wall of the heat insulation shell to the right and is fixed on the left end face of the front scraper.
[0012] Multiple support frames that are fixed to the ground are fixed on the bottom surface of the heat insulation shell.
[0013] A through groove is provided on the bottom wall of the heat insulation shell, and a cover plate is connected to the bottom surface of the through groove by screws.
[0014] The front scraper and the rear scraper are fixed together as one unit by locking screws.
[0015] A mounting plate is fixedly mounted on the left end face of the front scraper, and the piston rod of the linear cylinder is fixedly mounted on the mounting plate.
[0016] Both valves are located below the bend in the pipe, and the two valves are arranged symmetrically on the left and right.
[0017] This invention has the following advantages: it greatly improves the heat exchange efficiency between steam and flue gas. Attached Figure Description
[0018] Figure 1 A schematic diagram of the structure of a superheater used in a certain region;
[0019] Figure 2 for Figure 1 A schematic diagram of the operation of the superheater in the diagram;
[0020] Figure 3 This is a schematic diagram of the structure of this utility model;
[0021] Figure 4 for Figure 3 AA section view;
[0022] Figure 5 for Figure 3 BB section view;
[0023] Figure 6 This is a schematic diagram of the front scraper.
[0024] Figure 7 This is a schematic diagram of the working process of this utility model;
[0025] In the picture:
[0026] 1-Insulation shell, 2-Exhaust pipe, 3-Valve, 4-Bend pipe, 5-Steam exhaust pipe, 6-Steam inlet pipe, 7-Cover plate;
[0027] 8-Branch pipe, 9-Main smoke inlet pipe, 10-Front scraper, 11-Rear scraper, 12-Semi-circular hole, 13-Linear cylinder, 14-Piston rod, 15-Support bracket, 16-Locking screw, 17-Mounting plate. Detailed Implementation
[0028] The present invention will be further described below with reference to the accompanying drawings. The scope of protection of the present invention is not limited to the following description:
[0029] like Figures 3-6 As shown, a boiler superheater with high heat exchange efficiency includes an insulation shell 1, a flue pipe 2 fixed to the top of the insulation shell 1, and a heat exchange tube inside the insulation shell 1. The heat exchange tube includes a bent pipe 4, a steam discharge pipe 5 and a steam inlet pipe 6 fixed to both ends of the bent pipe 4, the steam discharge pipe 5 penetrating upward through the top wall of the insulation shell 1, and the steam inlet pipe 6 penetrating to the right through the right side wall of the insulation shell 1. Valves 3 are connected to both the left and right side walls of the insulation shell 1. The inner ports of the two valves 3 are connected to the inner cavity of the insulation shell 1, and branch pipes 8 are connected to the outer ports of the two valves 3. A main flue pipe 9 is fixed between the two branch pipes 8, and the left end of the main flue pipe 9 is closed. The two valves 3 are located below the bent pipe 4 and are symmetrically arranged on the left and right sides.
[0030] The bent tube 4 is externally fitted with a front scraper 10 and a rear scraper 11. Multiple opposing semi-circular holes 12 are provided on the inner end faces of both the front and rear scrapers 10 and 11, and these semi-circular holes 12 mate with the outer wall of the bent tube 4. A linear cylinder 13 is also fixed to the left side wall of the heat insulation shell 1. The piston rod 14 of the linear cylinder 13 extends to the right through the left side wall of the heat insulation shell 1 and is fixed to the left end face of the front scraper 10. The front scraper 10 and the rear scraper 11 are fixed together by locking screws 16. A mounting plate 17 is fixed to the left end face of the front scraper 10, and the piston rod 14 of the linear cylinder 13 is fixed to the mounting plate 17.
[0031] Multiple support frames 15, which are supported on the ground, are fixed on the bottom surface of the heat insulation shell 1. A through groove is opened on the bottom wall of the heat insulation shell 1, and a cover plate 7 is connected to the bottom surface of the through groove by screws.
[0032] The working process of this utility model is as follows:
[0033] S1. The worker introduces the flue gas discharged from the boiler into the main flue gas inlet pipe 9. One stream of flue gas sequentially passes through the right-side branch pipe 8, the right-side valve 3, and the inner cavity of the insulation shell 1, finally being discharged into the next stage of treatment via the exhaust pipe 2. Simultaneously, another stream of flue gas sequentially passes through the left-side branch pipe 8, the left-side valve 3, and the inner cavity of the insulation shell 1, finally being discharged into the next stage of treatment via the exhaust pipe 2. The flow direction of the flue gas is as follows: Figure 7 As indicated by the solid arrow in the center;
[0034] S2. The steam discharged from the boiler is introduced into the steam inlet pipe 6. The steam flows sequentially through the steam inlet pipe 6, the bend pipe 4, and the steam outlet pipe 5, finally entering the subsequent power generation system. The steam flow direction is as follows: Figure 7 As shown by the hollow arrow; when the steam flows through the bend pipe 4, the flue gas entering the insulation shell 1 exchanges heat with the steam in the bend pipe 4, thereby heating the steam flowing through the bend pipe 4. After the heated steam enters the power generation system, steam power generation can be realized.
[0035] S3. After the superheater has been working for a period of time, a layer of dust will be covered on the outer wall of the bent tube 4. The dust layer will cover the bent tube 4, causing the heat exchange efficiency between steam and flue gas to decrease. At this time, the operator controls the piston rod 14 of the linear cylinder 13 to extend to the right. The piston rod drives the front scraper 10 to move to the right. The front scraper 10 then drives the rear scraper 11 to move synchronously. When the front scraper 10 and the rear scraper 11 are moving to the right, since the semi-circular holes 12 in the front scraper 10 and the rear scraper 11 are in contact with the outer wall of the bent tube 4, the front scraper 10 and the rear scraper 11 will scrape off all the dust layer attached to the outer wall of the bent tube 4. The scraped-off dust will fall onto the bottom wall of the inner cavity of the heat insulation shell 1. When the piston rod 14 of the linear cylinder 13 is fully extended, the dust layer attached to the outer wall of the bent tube 4 can be completely scraped off.
[0036] As can be seen from step S3, by simply controlling the piston rod of the linear cylinder 13 to extend to the right, the dust layer attached to the outer wall of the bent pipe 4 can be completely scraped off by the front scraper 10 and the rear scraper 11. Since the dust layer attached to the outer wall of the bent pipe 4 is completely scraped off, the heat exchange efficiency between the flue gas in the insulation shell 1 and the steam in the bent pipe 4 is greatly improved.
[0037] Furthermore, as can be seen from step S1, since the two streams of flue gas enter the heat insulation shell 1 from the two valves 3 respectively, the flue gas is dispersed in the inner cavity of the heat insulation shell 1, thereby increasing the contact area between the flue gas and the bend pipe 4, and realizing the heating of the steam in the bend pipe 4 in a short time, thereby further improving the heat exchange efficiency between steam and flue gas.
[0038] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A boiler superheater with high heat exchange efficiency, comprising an insulation shell (1), a flue pipe (2) fixed to the top of the insulation shell (1), and a heat exchange tube disposed inside the insulation shell (1), the heat exchange tube comprising a bent pipe (4), a steam discharge pipe (5) and a steam inlet pipe (6) respectively fixed to both ends of the bent pipe (4), the steam discharge pipe (5) penetrating upward through the top wall of the insulation shell (1), and the steam inlet pipe (6) penetrating to the right through the right side wall of the insulation shell (1), characterized in that: Valves (3) are connected to the left and right side walls of the heat insulation shell (1). The inner ports of the two valves (3) are connected to the inner cavity of the heat insulation shell (1). Branch pipes (8) are connected to the outer ports of the two valves (3). A main smoke inlet pipe (9) is fixed between the two branch pipes (8). The left end of the main smoke inlet pipe (9) is closed. The bent tube (4) is externally fitted with a front scraper (10) and a rear scraper (11). Multiple opposing semi-circular holes (12) are provided on the inner end faces of the front scraper (10) and the rear scraper (11). The semi-circular holes (12) in the front scraper (10) and the rear scraper (11) are all in cooperation with the outer wall of the bent tube (4). A linear cylinder (13) is also fixed on the left side wall of the heat insulation shell (1). The piston rod (14) of the linear cylinder (13) passes through the left side wall of the heat insulation shell (1) to the right and is fixed on the left end face of the front scraper (10).
2. A boiler superheater with high heat exchange efficiency according to claim 1, characterized in that: Multiple support frames (15) supporting the ground are fixed on the bottom surface of the heat insulation shell (1).
3. A boiler superheater with high heat exchange efficiency according to claim 1, characterized in that: A through groove is provided on the bottom wall of the heat insulation shell (1), and a cover plate (7) is connected to the bottom surface of the through groove by screws.
4. A boiler superheater with high heat exchange efficiency according to claim 1, characterized in that: The front scraper (10) and the rear scraper (11) are fixed together by locking screws (16).
5. A boiler superheater with high heat exchange efficiency according to claim 1, characterized in that: A mounting plate (17) is fixedly mounted on the left end face of the front scraper (10), and the piston rod (14) of the linear cylinder (13) is fixedly mounted on the mounting plate (17).
6. A boiler superheater with high heat exchange efficiency according to claim 1, characterized in that: Both valves (3) are located below the bend pipe (4), and the two valves (3) are symmetrically arranged on the left and right.