Novel dry quenching coke powder cooling device

Abstract

The utility model discloses a novel dry quenching coke powder cooling device, which is arranged at the bottom of a primary dust remover, the novel dry quenching coke powder cooling device comprises a cylinder and an air distribution plate arranged in the cylinder, the air distribution plate is trumpet-shaped, a plurality of vent holes are uniformly distributed on the air distribution plate, and the air distribution plate is arranged close to the inner bottom of the cylinder; the bottom of the barrel is connected with a conveying branch, and the conveying branch is used for conveying cooled inert gas into the barrel; and the top of the barrel is communicated with the bottom of the primary dust remover. According to the utility model, high-temperature coke powder falling from the primary dust remover is rapidly cooled under fluidization by utilizing cold inert gas, so that the sensible heat loss of the coke powder in dry quenching is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of dry quenching coke powder cooling, and more specifically, to a novel dry quenching coke powder cooling device. Background Art

[0002] During the CDQ process, the high-temperature nitrogen that replaces the sensible heat of the red coke passes through the primary dust collector for gravity dust removal and then passes through the waste heat boiler to generate 3.82 MPa medium-pressure steam, which is then recovered by the steam turbine generator for power generation. The primary dust collector is located between the CDQ furnace and the waste heat boiler to remove the high-temperature dust (coke powder with a particle size of more than 1 mm) generated during the heat exchange between the coke and the circulating gas, ensuring that the mass concentration of coke powder in the high-temperature flue gas entering the waste heat boiler is within 10g / m 3 This reduces erosion on boiler tubes, extends boiler service life, and ensures stable operation of the CDQ unit. Large red-hot coke particles settling from the primary dust collector are typically cooled through a water-cooling jacket before being discharged. However, due to design flaws and the quality of the circulating water, these jackets leak after 3-6 months of use. Water vapor enters the closed circulating nitrogen system, causing excessive levels of H2 and CO in the system and posing an explosion hazard. Furthermore, if the large red-hot coke particles settling from the primary dust collector are not removed promptly and thoroughly, they can enter the waste heat boiler (HRSG), increasing the risk of wear and tube bursts. Utility Model Content

[0003] The utility model provides a novel dry quenching coke powder cooling device, which is arranged at the bottom of a primary dust collector and comprises a cylinder and an air distribution plate arranged inside the cylinder, wherein the air distribution plate is trumpet-shaped and evenly distributed with a plurality of ventilation holes, and the air distribution plate is arranged close to the inner bottom of the cylinder; the bottom of the cylinder is connected to a conveying branch, and the conveying branch is used to convey cooled inert gas into the cylinder; the top of the cylinder is connected to the bottom of the primary dust collector.

[0004] Preferably, the diameter of the air distribution plate gradually increases from bottom to top, and its inclination angle relative to the horizontal plane is 15°~60°; the top of the air distribution plate is fixedly connected to the inner wall of the cylinder, and the bottom is connected to one end of the coke discharge pipeline, and the other end of the coke discharge pipeline extends vertically downward from the bottom of the cylinder.

[0005] Preferably, a plurality of rows of ventilation holes are provided on the air distribution plate along its circumference, and the ventilation holes in each row are spaced apart along the radial direction of the air distribution plate; and the aperture of the ventilation holes is 5-20 mm.

[0006] Preferably, the coke powder falling from the primary dust collector into the cylinder forms a coke powder bed at the bottom of the cylinder, and the height of the coke powder bed in the cylinder is 0.5-2 m.

[0007] Preferably, the cylinder is a water-cooled cylinder, and the water-cooled cylinder comprises an outer wall, an inner wall and a cooling water channel arranged therebetween.

[0008] Preferably, one end of the conveying branch connected to the cylinder is divided into a plurality of sub-branches, each of the sub-branches is symmetrically arranged about the center of the cylinder, and all extend into the bottom of the cylinder and face the air distribution plate.

[0009] The utility model has at least the following beneficial effects:

[0010] 1. The novel CDQ coke powder cooling device provided by this utility model is installed at the bottom of the primary dust collector, eliminating the need for coke powder to accumulate at the discharge port of the primary dust collector hopper. This reduces the risk of coke powder secondary carryover, thereby reducing wear and tear on the waste heat boiler (HRSG) and the risk of HRSG pipe bursts. Inert gas is introduced into the coke powder cooling device via a conveying branch, rapidly cooling the high-temperature coke powder under fluidization. This converts the high-temperature heat of the CDQ coke powder into the heat of the high-temperature circulating inert gas, reducing the sensible heat loss of the CDQ coke powder. Furthermore, the inert gas-based coke powder cooling avoids the drawbacks of conventional water-cooled jacket cooling.

[0011] 2. The novel dry quenching coke powder cooling device provided by the utility model forms fluidized air at the inner bottom of the cylinder by arranging an air distribution plate at the inner bottom of the coke powder cooling device, so that the coke powder in the bed layer continuously surges to form a bubbling state, thereby achieving the purpose of uniformly cooling the coke powder. At the same time, the coke powder will not be brought into the waste heat boiler, further reducing the risk of secondary carryover of coke powder.

[0012] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the coke powder cooling device of the present invention;

[0014] Figure 2 This is a structural schematic diagram of the air distribution plate described in the utility model. DETAILED DESCRIPTION

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0016] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "horizontal", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0017] like Figures 1 to 2 As shown, the utility model provides a novel dry quenching coke powder cooling device, which is arranged at the bottom of the primary dust collector, the primary dust collector, the secondary dust collector, and the circulating fan. The coke powder cooling device includes a cylinder 81 and an air distribution plate 82 arranged inside the cylinder 81. The air distribution plate 82 is trumpet-shaped and evenly distributed with multiple ventilation holes 821. The air distribution plate 82 is arranged close to the inner bottom of the cylinder 1; the bottom of the cylinder 81 is connected to a conveying branch 7, and the conveying branch 7 is used to convey the cooled inert gas into the cylinder 81; the top of the cylinder 81 of the circulating fan sub-economizer is connected to the bottom of the primary dust collector.

[0018] In this technical solution, the conventional CDQ coke cooling process includes a CDQ oven, a primary dust collector, a waste heat boiler, a secondary dust collector, a circulating fan, and a secondary economizer, all connected in sequence via pipelines. After entering the CDQ oven, the coke undergoes gas-solid heat exchange with cold inert gas from the secondary economizer at the bottom of the oven, cooling the coke from 900°C to 150°C before discharge. The rising, high-temperature circulating inert gas carries coke particles of varying sizes into the primary dust collector, where they undergo a primary separation by gravity. Large coke particles then fall through the coke hopper at the bottom into the coke cooling device at the bottom, where they are cooled to 150°C on the coke bed before being discharged. The high-temperature inert gas then enters the waste heat boiler from the primary dust collector to exchange heat with the water-cooled pipe to produce high-temperature steam for waste heat power generation. The cooled inert gas then enters the secondary dust collector, where a bag filter or other dust removal measures are used for secondary dust removal to further reduce the dust content in the inert gas. The circulating gas after dust removal is pressurized by the circulating fan and then sent to the auxiliary economizer for further cooling and waste heat recovery. The auxiliary economizer is used to reduce the inert gas from 170°C to 130°C. The cooled circulating gas enters the bottom of the dry quenching furnace to cool the high-temperature hot coke, and this cycle is repeated endlessly. In the present invention, the inert gas transported through the conveying branch 7 can be introduced from the inert gas sent to the auxiliary economizer by the circulating fan, that is, one end of the conveying branch 7 is connected to the pipeline between the circulating fan and the auxiliary economizer, and the other end extends into the bottom of the cylinder 81. Preferably, the air volume introduced into the coke powder cooling device via the conveying branch 7 accounts for 0.5% to 3% of the total air volume at the outlet of the circulating fan. Inert gas is introduced into the coke powder cooling device via the conveying branch 7, where the high-temperature heat of the CDQ coke powder is converted into high-temperature circulating inert gas heat. The heat is then passed through a primary dust collector and enters the waste heat boiler. The waste heat boiler recovers high-temperature heat energy, reducing the sensible heat loss of the CDQ coke powder and improving the thermal efficiency of the CDQ waste heat boiler, thereby improving the overall power generation efficiency. Furthermore, the inert gas-based cooling of the coke powder avoids the drawbacks of conventional water-cooled jacket cooling. Specifically, the cylinder 81 includes a plurality of cylinder segments, with adjacent cylinder segments connected by expansion joints to allow the coke powder cooling device to expand freely up and down.

[0019] In another technical solution, Figure 1 and Figure 2 As shown, the diameter of the air distribution plate 82 gradually increases from bottom to top, and its inclination angle θ relative to the horizontal plane ranges from 15° to 60°. The top of the air distribution plate 82 is fixedly connected to the inner wall of the cylinder 81, and its bottom is connected to one end of the coke discharge pipeline 83, the other end of which extends vertically downward from the bottom of the cylinder 81. In actual use, the end of the coke discharge pipeline 83 extending from the cylinder 81 is successively equipped with a dust removal and ash discharge valve 84 and a shut-off valve 85.

[0020] The air distribution plate 82 is provided with a plurality of rows of ventilation holes along its circumference, and the ventilation holes in each row are arranged at intervals along the radial direction of the air distribution plate 82; the aperture of the ventilation holes is 5-20 mm.

[0021] Initially, after coke enters the coke cooling device, inert gas, pressurized by a circulating fan, is introduced at the bottom. Under the action of the inert gas, the coke forms a cooler coke bed at the bottom of the cylinder 81. The subsequent falling, high-temperature coke exchanges heat with the inert gas in a countercurrent flow, and after reaching the bottom, it continues to mix and exchange heat with the lower-temperature coke at the bottom. The inert gas introduced at the bottom forms a fluidizing air flow, causing the coke in the bed to continuously surge and bubble on the air distribution plate 82, achieving uniform cooling. Ultimately, the coke is cooled to 150°C and discharged uniformly, avoiding the problem of hot coke directly entering the lower-temperature coke bin, a problem encountered in conventional coke cooling sleeves.

[0022] In another technical solution, the height h of the coke bed in the cylinder 81 is 0.5~2m. By controlling the height h of the coke bed, the falling coke is evenly mixed with the cold coke in the bed, so that the coke discharge temperature is uniform and stable. The fluidization at the bottom of the cylinder 81 is different from conventional fluidized bed combustion, fluidized bed solid waste treatment and other devices. It mainly cools high-temperature coke. Due to the difference in physical properties, the fluidization device needs to control the appropriate airflow rate. At the same time, by reasonably adjusting the coke discharge rate, the coke bed height is guaranteed to be stable. Preferably, a pressure monitoring device can also be set on the conveying branch 7, and the change in bed height can be monitored in real time by the change in gas pressure.

[0023] In another technical solution, the cylinder 81 is a water-cooled cylinder, comprising an outer wall, an inner wall, and a cooling water channel disposed therebetween. The outlet and inlet of the cooling water channel are connected to the inlet and outlet of the auxiliary economizer, respectively. This water-cooled cylinder improves cooling efficiency, allowing the coke powder at the bottom to form a bed region with a temperature within the 150°C range, under the dual cooling effects of the cooled inert gas and the water-cooled cylinder. Preferably, the water-cooled cylinder uses desalted water as cooling water. The desalted water then enters the auxiliary economizer for heat exchange, recovering some of the waste heat.

[0024] In another technical solution, the end of the conveying branch 7 connected to the cylinder 81 is divided into multiple sub-branches 71. Each sub-branch 71 is symmetrically arranged about the center of the cylinder 81 and extends into the bottom of the cylinder 81 and toward the air distribution plate 82. The multiple sub-branches 71 ensure that the inert gas introduced into the cylinder 81 can be evenly distributed to the air distribution plate 82, so that the coke powder in the bed is evenly cooled.

[0025] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with this field, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A novel dry quenching coke powder cooling device is arranged at the bottom of the primary dust collector, characterized in that: It includes a cylinder and an air distribution plate arranged inside the cylinder, the air distribution plate is trumpet-shaped and evenly distributed with multiple ventilation holes, and the air distribution plate is arranged close to the inner bottom of the cylinder; the bottom of the cylinder is connected to a conveying branch, and the conveying branch is used to convey cooled inert gas into the cylinder; the top of the cylinder is connected to the bottom of the primary dust collector.

2. The novel dry quenching coke powder cooling device according to claim 1, characterized in that: The diameter of the air distribution plate gradually increases from bottom to top, and its inclination angle relative to the horizontal plane is 15°~60°; the top of the air distribution plate is fixedly connected to the inner wall of the cylinder, and the bottom of the air distribution plate is connected to one end of the coke discharge pipeline, and the other end of the coke discharge pipeline extends vertically downward from the bottom of the cylinder.

3. The novel dry quenching coke powder cooling device according to claim 2, characterized in that: The air distribution plate is provided with a plurality of rows of ventilation holes along its circumference, and the ventilation holes in each row are arranged at intervals along the radial direction of the air distribution plate; and the aperture of the ventilation holes is 5-20 mm.

4. The novel dry quenching coke powder cooling device according to claim 1, characterized in that: The coke powder falling into the cylinder from the primary dust collector forms a coke powder bed at the bottom of the cylinder. The height of the coke powder bed in the cylinder is 0.5-2 m.

5. The novel dry quenching coke powder cooling device according to claim 1, characterized in that: The cylinder is a water-cooled cylinder comprising an outer wall, an inner wall and a cooling water channel arranged therebetween.

6. The novel dry quenching coke powder cooling device according to claim 1, characterized in that: One end of the delivery branch connected to the cylinder is divided into a plurality of sub-branches, each of which is symmetrically arranged about the center of the cylinder and extends into the bottom of the cylinder and faces the air distribution plate.

Images