Boiler waste heat recovery system

Abstract

The invention relates to the technical field of boiler waste heat recovery, in particular to a boiler waste heat recovery system which comprises a mounting base, a shell, a heat exchange tube and a dust scraping device, the shell is of a hollow cylindrical structure and is fixedly mounted on the mounting base, sealing end covers are arranged at the two ends of the shell respectively, the heat exchange tube is coaxially and rotatably arranged in the shell through the sealing end covers, and the dust scraping device is arranged in the shell. A smoke channel is formed between the outer wall of the heat exchange pipe and the inner wall of the shell and provided with an air inlet and an air outlet, the heat exchange pipe is provided with a water inlet and a water outlet, the dust scraping device is a scraping strip fixedly arranged on the inner wall of the shell, and the scraping strip rotates along with the heat exchange pipe to make contact with the outer wall of the heat exchange pipe and removes accumulated dust on the outer wall of the heat exchange pipe. And the shell is provided with an ash outlet below the air outlet. The boiler waste heat recovery device solves the problem that in the prior art, in the long-time operation process of a boiler waste heat recovery device, smoke dust is prone to being accumulated on the outer wall of a heat exchange pipe, and heat exchange efficiency is reduced, the outer wall of the heat exchange pipe can be kept clean continuously, heat exchange efficiency is improved, and stable operation of equipment is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of boiler waste heat recovery technology, and more particularly to a boiler waste heat recovery system. Background Technology

[0002] Currently, flue gas waste heat recovery units, also known as flue gas coolers, are important heat exchange devices. Their core function is to convert the heat from waste flue gas into hot water, hot air, or hot fluid needed for production and daily life, achieving effective recovery and utilization of waste heat. Specifically, air-flue gas heat exchangers can capture heat from high-temperature or medium-temperature flue gas generated by industrial kilns, boilers, coke ovens, blast furnaces, metallurgical furnaces, etc., and transfer this heat to water or air through a heat exchange process. However, in practical applications, boiler flue gas often carries a certain amount of impurities when entering the flue gas waste heat recovery unit. These impurities easily adhere to the outer wall of the heat-conducting pipes during the process of flue gas heating the heat-conducting pipes. If not cleaned in time, the impurities on the outer wall of the heat-conducting pipes will gradually thicken over time, severely affecting the heat exchange efficiency of the flue gas waste heat recovery unit. Summary of the Invention

[0003] Therefore, in view of the above problems, the present invention proposes a boiler waste heat recovery system.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a boiler waste heat recovery system, comprising a mounting base, a shell, heat exchange tubes, and a dust scraping device. The shell is a hollow cylindrical structure and is fixedly mounted on the mounting base. Sealing end caps are provided at both ends of the shell. The heat exchange tubes are coaxially and rotatably disposed inside the shell through the sealing end caps. A flue gas channel for flue gas circulation is formed between the outer wall of the heat exchange tubes and the inner wall of the shell. The flue gas channel has an inlet and an outlet. The heat exchange tubes have a water inlet and an outlet. The dust scraping device is a scraper blade fixed to the inner wall of the shell. The free end of the scraper blade is in close contact with the outer wall of the heat exchange tubes. The scraper blade rotates with the heat exchange tubes to scrape off the accumulated dust on the outer wall of the heat exchange tubes. An ash outlet is provided below the outlet of the shell.

[0005] In a further improvement, the shell is cone-shaped, and the end with the ash outlet is the large-diameter end of the shell.

[0006] In a further improvement, the scraper is a spiral scraper that extends axially along the housing.

[0007] As a further improvement, the inner wall of the heat exchange tube is provided with a baffle plate.

[0008] As a further improvement, a vibrator is provided at the ash outlet.

[0009] By adopting the aforementioned technical solution, the beneficial effects of the present invention are as follows: The present invention, through the dust scraping device and the rotatable heat exchange tube, can effectively remove the dust accumulated on the outer wall of the heat exchange tube, thereby avoiding the problem of impurities accumulating and affecting the heat exchange efficiency. The dust scraped off by the scraper will be transported to the ash outlet under the action of the flue gas, so that most of it will be discharged from the ash outlet, thereby reducing the retention of dust in the flue gas channel and reducing the risk of blockage. Furthermore, the shell is conical in shape, and the ash outlet is set at the large diameter end, which further helps the accumulated dust to be discharged smoothly along the inclined shell. Furthermore, the spiral scraper design not only enhances the dust scraping effect, but also drives the dust to move towards the ash outlet, improving the dust discharge efficiency. Furthermore, the baffle plate set on the inner wall of the heat exchange tube, together with the rotating heat exchange tube, can create disturbance in the water flow in the heat exchange tube, uniform water temperature, thereby improving the heat exchange efficiency. Attached Figure Description

[0010] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0011] Figure 2 yes Figure 1 Schematic diagram of the AA section structure;

[0012] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0013] Figure 4 yes Figure 3 Schematic diagram of the BB cross-section structure;

[0014] Figure 5 This is a schematic diagram of the structure of Embodiment 3 of the present invention.

[0015] icon:

[0016] 1. Mounting base; 2. Housing; 21. End cap; 3. Heat exchange tube; 31. Water inlet; 32. Water outlet; 33. Baffle plate; 41. Flat scraper; 42. Spiral scraper; 5. Flue gas passage; 51. Air inlet; 52. Air outlet; 6. Ash outlet; 7. Vibrator. Detailed Implementation

[0017] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0018] Example 1

[0019] refer to Figure 1 , Figure 2This embodiment provides a boiler waste heat recovery system, including a mounting base 1, a shell 2, heat exchange tubes 3, and a dust scraper. The shell 2 has a hollow cylindrical structure, specifically a conical shape with a hollow structure. The shell 2 is fixedly mounted on the mounting base 1. Sealing end caps 21 are respectively provided at both ends of the shell 2. The heat exchange tubes 3 are coaxially and rotatably disposed inside the shell 2 through the sealing end caps 21. The heat exchange tubes 3 are rotated by a motor. A space is formed between the outer wall of the heat exchange tubes 3 and the inner wall of the shell 2 for flue gas circulation. The flue gas passage 5 has an air inlet 51 and an air outlet 52. The heat exchange tube 3 has a water inlet 31 and a water outlet 32. The dust scraping device is a scraper fixed to the inner wall of the shell 2. The scraper is a flat scraper 41. The free end of the flat scraper 41 is in close contact with the outer wall of the heat exchange tube 3. The flat scraper 41 rotates with the heat exchange tube 3 to scrape off the dust accumulated on the outer wall of the heat exchange tube 3. The shell 2 is provided with an ash outlet 6 below the air outlet 52. The end with the ash outlet 6 is the large diameter end of the shell 2.

[0020] The present invention, through the dust scraping device and the rotatable heat exchange tube 3, can effectively remove the dust accumulated on the outer wall of the heat exchange tube 3, thereby avoiding the problem of impurities accumulating and affecting the heat exchange efficiency. The dust scraped off by the scraper will be transported to the ash outlet 6 by the flue gas and the conical shell 2 under the action of the flue gas flow direction and gravity, so that most of it will be discharged from the ash outlet 6, thereby reducing the retention of dust in the flue gas channel 5 and reducing the risk of blockage.

[0021] In this embodiment, a vibrator 7 is also provided at the ash outlet 6. The vibrator 7 can loosen the accumulated dust at the ash outlet 6, so that the dust can be discharged smoothly and the dust can be prevented from accumulating and clogging the ash outlet 6.

[0022] In practical applications, the housing 2 can also be a cylindrical structure, but a conical structure is more conducive to the discharge of dust, so a conical shape is preferred.

[0023] Example 2

[0024] refer to Figure 3 , Figure 4 This embodiment two provides a boiler waste heat recovery system based on the same inventive concept as embodiment one. The difference from embodiment one is that the inner wall of the heat exchange tube 3 is provided with multiple baffles 33. Specifically, every three baffles 33 form a group of baffle structures, forming multiple groups of baffle structures. Each baffle structure is distributed at intervals along the axis of the heat exchange tube 3, and the baffles 33 of each group of baffle structures are arranged at intervals around the circumference of the heat exchange tube 3.

[0025] In practical applications, the baffle 33 can be arranged in a spiral or inclined shape to enhance the turbulence effect of the water flow, thereby improving the heat exchange efficiency. The number of baffle structures and baffles 33 is adaptively adjusted according to the length and diameter of the heat exchange tube 3 to ensure uniform water flow distribution and sufficient agitation.

[0026] In this embodiment, the baffle 33, in conjunction with the rotating heat exchange tube 3, can create disturbances in the water flow within the heat exchange tube 3, uniformly distributing the water temperature and thereby improving heat exchange efficiency. This avoids insufficient heat exchange caused by temperature gradients in the water flow within the heat exchange tube 3, and greatly enhances heat exchange efficiency.

[0027] Example 3

[0028] refer to Figure 5 This embodiment three provides a boiler waste heat recovery system based on the same inventive concept as embodiment two. The difference from embodiment two is that the scraper is a spiral scraper 42 and extends along the axial direction of the shell 2.

[0029] In this embodiment, the spiral scraper 42 not only enhances the dust scraping effect, but also drives the dust towards the dust outlet 6, while preventing the dust from spreading inside the housing 2, so that the dust is more effectively concentrated in the dust outlet 6 area, greatly improving the dust removal efficiency.

[0030] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A boiler heat recovery system, characterized by: The application relates to a heat exchange device, which comprises a mounting base, a shell, a heat exchange pipe and a dust scraping device, the shell is in a hollow cylindrical structure, the shell is fixedly installed on the mounting base, the shell is provided with sealing end covers at two ends respectively, the heat exchange pipe is coaxially and rotatably arranged in the shell through the sealing end covers, a flue gas channel for flue gas circulation is formed between the outer wall of the heat exchange pipe and the inner wall of the shell, the flue gas channel is provided with an air inlet and an air outlet, the heat exchange pipe is provided with a water inlet and a water outlet, the dust scraping device is a scraping strip fixed to the inner wall of the shell, the free end of the scraping strip is close to the outer wall of the heat exchange pipe, the scraping strip removes dust on the outer wall of the heat exchange pipe by rotating with the heat exchange pipe, and the shell is provided with a dust outlet below the air outlet.

2. A boiler heat recovery system according to claim 1, characterised in that: The shell is in a conical cylindrical structure, and the end provided with the dust outlet is the large-diameter end of the shell.

3. A boiler heat recovery system according to claim 1, wherein: The scraping strip is a spiral scraping strip and extends along the axial direction of the shell.

4. A boiler heat recovery system according to claim 1, wherein: The inner wall of the heat exchange pipe is provided with a spoiler.

5. A boiler heat recovery system according to claim 1, wherein: The dust outlet is provided with a vibrator.

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