A device for utilizing waste heat from coke oven gas

Abstract

This utility model relates to the field of waste heat utilization technology, specifically a device for utilizing waste heat from coke oven gas. To address the problem in existing waste heat utilization devices where cleaning the heat exchange tubes is difficult due to the parallel direction of the cleaning fluid flushing the tubes, multiple rotating shafts are rotatably connected to the end face of the heat exchange shell along the gas conveying direction. Each shaft is concentrically positioned with its corresponding heat exchange tube. A spiral blade is connected to the rotating shaft inside the heat exchange tube, with the outer edge of the spiral blade aligning with the inner surface of the heat exchange tube. Power is transmitted through a transmission mechanism to drive all rotating shafts to rotate in the same direction. The tar on the spiral blade surface is directly dissolved by the cleaning fluid and easily flushed off. The spiral blade also guides the cleaning fluid to flush the tube wall, resulting in excellent cleaning performance. During tube wall cleaning, the spiral blade rotates synchronously, scraping off the tar condensed on the inner wall of the heat exchange tube. The scraped tar, combined with the cleaning fluid, is transported to the tail end of the heat exchange shell for collection. This significantly improves the cleaning effect compared to existing direct flushing techniques.

Description

Technical Field

[0001] This utility model relates to the field of waste heat utilization technology, specifically to a device for utilizing waste heat from coke oven gas. Background Technology

[0002] Coke oven gas is a byproduct of coal coking. It has a complex composition, mainly containing combustible gases such as hydrogen (H2), methane (CH4), and carbon monoxide (CO), as well as impurities such as tar, naphthalene, and hydrogen sulfide (H2S). When it exits the furnace, its temperature is usually 650~800℃, carrying a large amount of sensible heat (physical heat) and latent heat (chemical heat). Each ton of dry coal can produce about 300~350m³ of coke oven gas. The residual heat is equivalent to 15%~20% of the total energy consumption of coking. Direct emission would result in a huge waste of energy.

[0003] Existing technology utilizes waste heat through heat exchangers, with a water jacket covering the heat exchange tubes. When high-temperature gas at around 800℃ flows inside the heat exchange tubes, heat is transferred through the tube walls to the outer water jacket. The water inside the jacket absorbs heat, and some of it vaporizes to produce hot water or steam for use.

[0004] However, since coke oven gas is a complex multi-component mixture, impurities such as tar and naphthalene condense as the temperature decreases during heat exchange, which can easily clog pipes and equipment and affect heat transfer efficiency. Existing technology uses cleaning fluid to directly flush the gas, but because the flushing direction of the cleaning fluid is parallel to the heat exchange tubes, it is difficult to flush off the tar. Utility Model Content

[0005] This invention addresses the problem in existing waste heat recovery devices where it is difficult to remove tar when cleaning the heat exchange tubes because the cleaning fluid is flushed parallel to the heat exchange tubes. Therefore, this invention provides a device for utilizing waste heat from coke oven gas.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a device for utilizing waste heat from coke oven gas, comprising: a heat exchange shell, the heat exchange shell being supported by a bracket, an inlet pipe and an outlet pipe respectively connected to both ends of the heat exchange shell, two partitions connected to the inner wall of the heat exchange shell, the two partitions separating a heat exchange zone within the heat exchange shell, a liquid injection pipe connected to the lower part of the heat exchange shell within the heat exchange zone, a liquid drain pipe connected to the upper part of the heat exchange shell, holes provided on the partitions, heat exchange tubes connected to the holes, the heat exchange tubes being connected to the inlet pipe and the outlet pipe through both sides of the heat exchange shell, multiple rotating shafts rotatably connected to the end face of the heat exchange shell along the gas conveying direction, each rotating shaft being concentrically arranged with the corresponding heat exchange tube, a spiral blade connected to the rotating shaft inside the heat exchange tube, the rotation path of the outer edge of the spiral blade coinciding with the inner surface of the heat exchange tube, and power driving all rotating shafts to rotate in the same direction through a transmission mechanism.

[0007] Preferably, the injection pipe along the gas conveying direction is connected to the beginning of the heat exchange zone, and the discharge pipe is connected to the end of the heat exchange zone.

[0008] Preferably, the transmission mechanism includes a pulley 1, all rotating shafts are evenly distributed around the circumference, and pulley 1 is connected to all rotating shafts. Multiple pulleys 1 located on the same circumference are connected to each other by a belt 1. A pulley 2 is connected to one rotating shaft on each circumference. Two pulleys 2 located on adjacent circumferences are connected to each other by a belt 2. One rotating shaft is connected to the power output shaft.

[0009] Preferably, the exhaust pipe is connected to the upper part of the heat exchange shell, and the lower part of the heat exchange shell below the exhaust pipe is connected to an ash hopper, with a valve at the bottom of the ash hopper.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] During regular cleaning, cleaning fluid is introduced into the heat exchange tubes. The tar on the surface of the spiral blades is dissolved by the direct spray of the cleaning fluid and is easily washed off. The spiral blades also guide the cleaning fluid to flush the tube walls, resulting in a very good cleaning effect. While cleaning the tube walls, the spiral blades rotate synchronously to scrape off the tar condensed on the inner wall of the heat exchange tubes. The scraped tar is then transported to the tail end of the heat exchange shell for collection in conjunction with the cleaning fluid. This method has a huge improvement in cleaning effect compared to the existing technology of direct flushing.

[0012] All shafts rotate in the same direction and at the same speed under the drive of a single power source, cleaning the heat exchange tubes and saving costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic cross-sectional view of the structure of this utility model;

[0015] Figure 3 This is an exploded view of the structure of this utility model;

[0016] Figure 4 This utility model Figure 1 An enlarged structural diagram.

[0017] In the diagram: 1. Heat exchange shell; 2. Support; 3. Air inlet pipe; 4. Baffle plate; 5. Heat exchange tube; 6. Rotating shaft; 7. Spiral blade; 8. Transmission mechanism; 81. Belt 1; 82. Belt 2; 84. Liquid injection pipe; 9. Liquid discharge pipe; 10. Ash hopper; 11. Exhaust pipe; 12. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] The rotary connection described in this device refers to the axial fixation of the bearing by mounting the bearing on the shaft, with a spring retaining ring groove provided on the shaft or shaft hole, and the rotation achieved by locking the elastic retaining ring in the retaining ring groove; the hinge connection refers to the connection method that allows movement through connecting parts such as hinges, pins, and short shafts.

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] The following is in conjunction with the appendix Figure 1-4 This embodiment describes a device for utilizing waste heat from coke oven gas, comprising: a heat exchange shell 1, supported by a bracket 2, with an inlet pipe 3 and an exhaust pipe 12 connected to both ends of the heat exchange shell 1 respectively; two partitions 4 connected to the inner wall of the heat exchange shell 1, separating a heat exchange zone within the heat exchange shell 1; a liquid injection pipe 9 connected to the lower part of the heat exchange shell 1 within the heat exchange zone, and a liquid drain pipe 10 connected to the upper part; holes provided on the partitions 4, with heat exchange tubes 5 connected inside the holes; the heat exchange tubes 5 are connected to the inlet pipe 3 and the exhaust pipe 12 via both sides of the heat exchange shell 1; multiple rotating shafts 6 are rotatably connected to the end face of the heat exchange shell 1 along the gas conveying direction, each rotating shaft 6 being concentrically arranged with the corresponding heat exchange tube 5; a spiral blade 7 is connected to the rotating shaft 6 inside the heat exchange tube 5, the rotation path of the outer edge of the spiral blade 7 coinciding with the inner surface of the heat exchange tube 5; and power is transmitted through a transmission mechanism 8 to drive all rotating shafts 6 to rotate in the same direction.

[0022] Coal gas is injected through the inlet pipe 3, enters the heat exchange tube 5, and is discharged through the exhaust pipe 12. Heat is transferred to the heat exchange tube 5. The heat exchange medium is introduced into the heat exchange zone through the injection pipe 9 and discharged through the drain pipe 10. It absorbs the heat on the heat exchange tube 5, completing the preheating absorption and utilization. Tar and other impurities are adsorbed on the spiral blade 7 and the inner wall of the heat exchange tube 5. During regular cleaning, cleaning fluid is introduced into the heat exchange tube 5. The tar on the surface of the spiral blade 7 is dissolved by the direct spray of the cleaning fluid and is easily washed off. The spiral blade 7 also guides the cleaning fluid to flush the tube wall of the heat exchange tube 5. The cleaning effect is very good. When cleaning the tube wall of the heat exchange tube 5, the rotating shaft 6 drives the spiral blade 7 to rotate synchronously, scraping off the tar condensed on the inner wall of the heat exchange tube 5. With the help of the cleaning fluid, the scraped tar is transported to the tail end of the heat exchange shell 1 for discharge and collection. Compared with the existing technology of direct flushing cleaning, the cleaning effect is greatly improved.

[0023] The injection pipe 9, which runs along the direction of gas transportation, is connected to the beginning of the heat exchange zone, and the discharge pipe 10 is connected to the end of the heat exchange zone.

[0024] The injection pipe 9 and the drain pipe 10 are staggered to prevent the heat exchange medium from passing through the drain pipe 10 immediately after injection. The fact that they are located on both sides of the heat exchange zone also allows the heat exchange medium to absorb heat more fully.

[0025] The transmission mechanism 8 includes pulley 81, all rotating shafts 6 are evenly distributed around the circumference, and pulley 81 is connected to all rotating shafts 6. Multiple pulleys 81 located on the same circumference are connected by belt 82. A second pulley 83 is connected to one rotating shaft 6 on each circumference. Two second pulleys 83 located on adjacent circumferences are connected by belt 84. One rotating shaft 6 is connected to the power output shaft.

[0026] The power drives the central shaft 6 to rotate. The central shaft 6 drives the shafts 6 on different circumferences to rotate through the pulley 83 and belt 84. The shafts 6 on each circumference drive all the shafts 6 to rotate synchronously through the pulley 81 and belt 82, so that all the shafts 6 can rotate in the same direction at the same speed.

[0027] The exhaust pipe 12 is connected to the upper part of the heat exchange shell 1, and the lower part of the heat exchange shell 1 below the exhaust pipe 12 is connected to the ash hopper 11, and the bottom of the ash hopper 11 is equipped with a valve.

[0028] After heat exchange is complete, the lighter gas rises and is discharged through exhaust pipe 12, while the heavier dust falls into ash hopper 11. The valve of ash hopper 11 is normally closed and can be opened to discharge ash during cleaning. During liquid injection cleaning, the liquid carrying tar is discharged through ash hopper 11.

[0029] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for coke oven gas waste heat utilization, comprising: A heat exchange shell (1) is supported by a bracket (2). The two ends of the heat exchange shell (1) are connected to an air inlet pipe (3) and an exhaust pipe (12). The inner wall of the heat exchange shell (1) is connected to two partitions (4). The two partitions (4) separate the heat exchange zone inside the heat exchange shell (1). The lower part of the heat exchange shell (1) in the heat exchange zone is connected to an injection pipe (9), and the upper part is connected to a drain pipe (10). The partitions (4) are provided with holes, and heat exchange pipes (5) are connected in the holes. The heat exchange pipes (5) are connected to the air inlet pipe (3) and the exhaust pipe (12) through both sides of the heat exchange shell (1). The feature is that: multiple rotating shafts (6) are rotatably connected to the end face of the heat exchange shell (1) along the gas conveying direction. Each rotating shaft (6) is concentrically arranged with the corresponding heat exchange tube (5). A spiral blade (7) is connected to the rotating shaft (6) inside the heat exchange tube (5). The rotation path of the outer edge of the spiral blade (7) coincides with the inner surface of the heat exchange tube (5). The power drives all rotating shafts (6) to rotate in the same direction through the transmission mechanism (8).

2. A device for utilizing the waste heat of coke oven gas according to claim 1, characterized in that: The injection pipe (9) along the gas conveying direction is connected to the beginning of the heat exchange zone, and the discharge pipe (10) is connected to the end of the heat exchange zone.

3. A device for utilizing the waste heat of coke oven gas as claimed in claim 1 wherein: The transmission mechanism (8) includes pulley 1 (81), all rotating shafts (6) are evenly distributed around the circumference, pulley 1 (81) is connected to all rotating shafts (6), multiple pulley 1 (81) located on the same circumference are connected to each other by belt 1 (82), one rotating shaft (6) on each circumference is connected to pulley 2 (83), two pulley 2 (83) located on adjacent circumferences are connected to each other by belt 2 (84), and one rotating shaft (6) is connected to the power output shaft.

4. A device for utilizing the waste heat of coke oven gas as claimed in claim 1 wherein: The exhaust pipe (12) is connected to the upper part of the heat exchange shell (1), and the lower part of the heat exchange shell (1) below the exhaust pipe (12) is connected to the ash hopper (11), and a valve is provided at the bottom of the ash hopper (11).

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