A modification method for increasing the processing capacity of an existing dry coke quenching device

Abstract

The present invention relates to a modification method for increasing the processing capacity of an existing dry quenching device, wherein the dry quenching furnace body of the dry quenching device includes a pre-storage area, a cooling area, a ramp area, and an annular air duct area; the ramp area is a single ramp structure; the modification of the dry quenching device is performed during the overhaul of the dry quenching device, and includes at least one of the following measures: 1) increasing the inner diameter of the cooling area; 2) increasing the height of the cooling area; 3) changing the ramp area from a single ramp structure to a double ramp structure. The present invention utilizes the overhaul of the dry quenching furnace for modification. Without changing the furnace shell, the processing capacity of the dry quenching furnace is effectively improved by rebuilding the refractory masonry of the dry quenching furnace, while making the refractory masonry of the dry quenching furnace stronger and more solid, reducing the maintenance frequency of the dry quenching furnace masonry, and achieving the goal of longevity.

Description

Technical Field

[0001] The present invention relates to dry coke quenching, and in particular to a modification method for increasing the processing capacity of an existing dry coke quenching device. Background Art

[0002] Coke is a vital raw material and energy source for steel production. Red coke produced in coke ovens must be cooled to a relatively low temperature for transportation and storage. Traditional wet quenching involves spraying water directly onto the red coke. This rapid cooling not only affects the coke's quality, but also, when the water meets the hot coke, it instantly launches vapors containing large amounts of phenols, cyanides, sulfides, and dust into the air, severely polluting the environment. Furthermore, the heat released by the hot red coke is wasted during the cooling process.

[0003] CDQ technology uses inert gas to cool red coke. From an environmental perspective, CDQ technology uses recycled steam to generate electricity, without emitting pollutants such as CO2, SO2 and NOx. It can completely eliminate the pollution of the atmosphere caused by the quenching steam containing large amounts of phenols, cyanides and sulfides produced by wet quenching. Therefore, CDQ technology has developed rapidly in my country in recent years.

[0004] As the service life of the dry coke quenching device increases, the equipment will gradually age and the processing capacity will gradually decline. This is especially true for the earliest dry coke quenching devices in China. The first generation of dry coke quenching devices, which are basically over 12 years old, have a designed processing capacity of 140 to 150 t / h. However, the actual processing capacity has generally declined significantly, and there is an actual need for equipment modification and technology upgrades.

[0005] In a CDQ unit, the CDQ furnace is structurally divided into four sections: the cooling zone, the chute zone, the annular air duct zone, and the pre-storage zone. The volume of the cooling zone, the structure of the chute zone, and its cross-sectional area directly influence the coke cooling time and air flow, which in turn directly determines the CDQ furnace's processing capacity.

[0006] The cooling zone of a CDQ furnace is a relatively simple structure, typically cylindrical. Coke falls from the pre-storage area into the cooling zone below. After heat exchange with the circulating air, it is discharged through the upper and lower cone hoppers at the bottom. The refractory masonry in the cooling zone must withstand the frequent temperature fluctuations during heat exchange, as well as the impact and friction of the coke flow.

[0007] The chute area of the CDQ furnace is the core and most important part of the entire CDQ unit. The chute area is usually cantilevered layer by layer and has a complex structure. The brackets in the chute area need to bear the entire weight of the inner ring wall of the annular air duct area. In addition, this area not only has a high operating temperature but also frequent temperature fluctuations. Coupled with the continuous erosion of circulating gas and the friction of coke, the brackets in the chute area are extremely prone to breakage, cracking in the middle of the bracket, wear and falling of bricks in contact with coke, etc., which has become the most critical issue restricting the processing capacity and service life of the CDQ furnace.

[0008] Early inclined duct areas all had single inclined duct structures, but recently double inclined ducts or inclined duct structures with more layers of inclined ducts have appeared, such as the "two-partitioned inclined air duct" disclosed in the Chinese utility model patent with authorization announcement number CN210595919U. The air duct space is divided into an upper space and a lower space by a partition wall, and the corbels are divided into an upper corbel and a lower corbel. The width of the upper corbel is smaller than the width of the lower corbel, so that a bottom boss is formed between the upper corbel and the lower corbel; the lower width of the upper corbel is greater than the upper width, and the lower width of the lower corbel is greater than the upper width; side bosses are respectively provided on both sides of the upper corbel and the lower corbel, and a partition wall is provided in the upper space. The bottoms at both ends of the partition wall cooperate with the bottom bosses to form a bottom support structure, and the sides at both ends of the partition wall cooperate with the side bosses to form a side support structure; the gas flow cross-sectional area of the lower space is greater than the gas flow cross-sectional area of the upper space. After adopting these measures, the support strength of the bracket to the inclined area is significantly improved, and the masonry of the partition wall is easier to locate and the connection is more secure. Compared with the single inclined structure, this two-part inclined air duct is more conducive to homogenizing the flow rate of gas in the inclined area, increasing the air flow capacity of the inclined area, and thus improving the processing capacity of the CDQ furnace. Summary of the Invention

[0009] The present invention provides a method for modifying an existing dry coke quenching device to increase its processing capacity. The method utilizes a major overhaul of the dry quenching furnace for modification. Without changing the furnace shell, the dry quenching furnace's refractory masonry is rebuilt to effectively improve the dry quenching furnace's processing capacity. At the same time, the strength of the dry quenching furnace's refractory masonry is made higher and more solid, thereby reducing the frequency of maintenance of the dry quenching furnace masonry and achieving the goal of prolonging the service life.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] A method for modifying an existing dry coke quenching device to increase its processing capacity, wherein the dry coke quenching furnace body of the dry coke quenching device includes a pre-storage area, a cooling area, a chute area, and an annular air duct area; the chute area is a single chute structure; the modification of the dry coke quenching device is performed during an overhaul of the dry coke quenching device and includes at least one of the following measures:

[0012] 1) Increase the inner diameter of the cooling zone;

[0013] 2) Increase the height of the cooling zone;

[0014] 3) Change the ramp area from a single ramp structure to a double ramp structure.

[0015] Furthermore, the inner diameter of the cooling zone is increased by removing all refractory masonry in the cooling zone during overhaul of the dry coke quenching device, and changing the inner wall of the cooling zone from an original flat structure to a concave structure when rebuilding the refractory masonry in the cooling zone.

[0016] Furthermore, the thickness of the top inner wall of the modified cooling zone is the same as the thickness of the original inner wall, and the thickness of the inner wall at the concave structure is less than the thickness of the top inner wall; and an upper inclined transition section is provided between the concave structure and the top inner wall; a lower inclined transition section is provided at the bottom inner wall of the modified cooling zone connected to the upper cone bucket, and the inclination angle of the lower inclined transition section is not less than the inclination angle of the upper cone bucket.

[0017] Furthermore, the increasing the height of the cooling zone specifically comprises: moving up a brick supporting plate between the cooling zone and the ramp zone for supporting the ramp zone.

[0018] Furthermore, the said conversion of the chute area from a single chute structure to a double chute structure is specifically as follows: when the dry coke quenching device is overhauled, all refractory masonry in the annular air duct area, the chute area and the pre-storage area is removed and rebuilt; when rebuilding, a partition wall is built in the chute area to convert the single chute into a double chute; the height of the chute area is increased, while the height of the annular air duct area is reduced, and the inner diameter of the inner ring wall of the annular air duct area and the inner diameter of the pre-storage area are both reduced.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] By overhauling the CDQ furnace for transformation, without changing the furnace shell, the CDQ furnace's processing capacity can be effectively improved by rebuilding the CDQ furnace's refractory masonry. At the same time, the CDQ furnace's refractory masonry can be made stronger and more solid, reducing the frequency of CDQ furnace maintenance and achieving the goal of longevity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the CDQ furnace transformation in an embodiment of the present invention.

[0022] Figure: 1. Refractory masonry in the cooling zone after renovation 2. Inner ring wall of the annular air duct after renovation 3. Double-slope partition wall 4. Inner wall of the CDQ furnace cooling zone after renovation 5. Inner wall of the CDQ furnace cooling zone before renovation 6. Expansion section 7. Unloading angle A in the cooling zone after renovation 8. Inclined angle B of the upper cone bucket DETAILED DESCRIPTION

[0023] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0024] The present invention discloses a method for modifying an existing dry coke quenching device to increase its processing capacity. The dry coke quenching furnace body of the dry coke quenching device includes a pre-storage area, a cooling area, a chute area, and an annular air duct area. The chute area is a single chute structure. The modification of the dry coke quenching device is performed during an overhaul of the dry coke quenching device and includes at least one of the following measures:

[0025] 1) Increase the inner diameter of the cooling zone;

[0026] 2) Increase the height of the cooling zone;

[0027] 3) Change the ramp area from a single ramp structure to a double ramp structure.

[0028] Furthermore, the inner diameter of the cooling zone is increased by removing all refractory masonry in the cooling zone during overhaul of the dry coke quenching device, and changing the inner wall of the cooling zone from an original flat structure to a concave structure when rebuilding the refractory masonry in the cooling zone.

[0029] Furthermore, the thickness of the top inner wall of the modified cooling zone is the same as the thickness of the original inner wall, and the thickness of the inner wall at the concave structure is less than the thickness of the top inner wall; and an upper inclined transition section is provided between the concave structure and the top inner wall; a lower inclined transition section is provided at the bottom inner wall of the modified cooling zone connected to the upper cone bucket, and the inclination angle of the lower inclined transition section is not less than the inclination angle of the upper cone bucket.

[0030] Furthermore, the increasing the height of the cooling zone specifically comprises: moving up a brick supporting plate between the cooling zone and the ramp zone for supporting the ramp zone.

[0031] Furthermore, the said conversion of the chute area from a single chute structure to a double chute structure is specifically as follows: when the dry coke quenching device is overhauled, all refractory masonry in the annular air duct area, the chute area and the pre-storage area is removed and rebuilt; when rebuilding, a partition wall is built in the chute area to convert the single chute into a double chute; the height of the chute area is increased, while the height of the annular air duct area is reduced, and the inner diameter of the inner ring wall of the annular air duct area and the inner diameter of the pre-storage area are both reduced.

[0032] The present invention describes a method for modifying an existing dry coke quenching unit to increase its processing capacity. The cooling zone is enlarged in volume by increasing its diameter or height, and the chute zone is modified from a single chute structure to a double chute structure. These three measures, which can be adopted individually or in combination, can improve the processing capacity of the existing dry coke quenching furnace, increase the strength of the masonry structure, and reduce the frequency of maintenance of the dry coke quenching furnace masonry.

[0033] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operating processes, but the protection scope of the present invention is not limited to the following examples.

[0034] [Example]

[0035] In this embodiment, Figure 1As shown in the figure, a 12-year-old CDQ furnace was renovated to increase its processing capacity. The renovation method was to completely remove the refractory masonry inside the original CDQ furnace and rebuild it.

[0036] like Figure 1 As shown, the original CDQ furnace's cooling zone was a straight cylindrical structure, meaning the inner wall 5 of the cooling zone before the renovation was flat. The thickness of the refractory masonry 1 in the cooling zone after the renovation was reduced. The inner wall 4 of the CDQ furnace's cooling zone now features a concave structure, achieving increased capacity. The volume of the expanded portion 6 is the difference in volume between the cooling zone before and after the renovation. Although the thickness of the inner wall of the modified cooling zone has been reduced, its strength still meets operational requirements.

[0037] After the transformation, the height H1 of the cooling zone of the CDQF is also greater than the height of the original cooling zone. The method adopted is to move the supporting brick plate between the cooling zone and the inclined zone, which is used to support the inclined zone, upward.

[0038] A downward slope transition section is provided at the bottom of the inner wall of the rebuilt cooling zone, so that the discharge angle 7 of the reconstructed cooling zone is larger than the inclination angle 8 of the upper cone bucket, which is conducive to discharge.

[0039] During the chute renovation, the masonry was rebuilt according to the "Two-partitioned Inclined Air Duct" design disclosed in Chinese Utility Model Patent No. CN210595919U. The original CDQ furnace's single chute structure was optimized for a dual chute structure, with a new dual chute partition wall 3 added. In this embodiment, the CDQ furnace's chute area is equipped with 24 brackets, with dual chute partition walls 3 constructed of refractory material between adjacent brackets. This conversion from a single chute to a dual chute enhances the strength of the chute area.

[0040] The height H2 of the modified inclined channel area is greater than that of the original CDQ furnace. When the furnace shell remains unchanged, the height of the annular air duct area is reduced accordingly.

[0041] Inner diameter of the inner ring wall 2 of the annular air duct area after transformation (inner diameter of the pre-storage area) It is equal to the inner diameter of the inner ring wall of the annular air duct area of the original CDQ furnace (inner diameter of the pre-storage area).

[0042] Through the above-mentioned transformation process, the volume of the CDQ furnace cooling zone was increased and the processing capacity of the chute zone was improved without basically changing the CDQ furnace shell.

[0043] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for modifying an existing dry coke quenching device to increase the processing capacity, wherein the dry coke quenching furnace body of the dry coke quenching device includes a pre-storage area, a cooling area, a chute area, and an annular air duct area; the chute area is a single chute structure; and the method is characterized in that: The modification of the CDQ unit is carried out during the CDQ unit overhaul, including increasing the height of the cooling zone.

2. The method for improving the processing capacity of an existing dry coke quenching device according to claim 1, characterized in that: It also includes increasing the inner diameter of the cooling zone. Specifically, when the dry quenching device is overhauled, all the refractory masonry in the cooling zone is removed, and when the refractory masonry in the cooling zone is rebuilt, the inner wall of the cooling zone is changed from the original flat structure to a concave structure.

3. The method for improving the processing capacity of an existing dry coke quenching device according to claim 2, characterized in that: The thickness of the top of the inner wall of the modified cooling zone is the same as the thickness of the original inner wall, and the thickness of the inner wall at the concave structure is less than the thickness of the top of the inner wall; and an upper inclined transition section is provided between the concave structure and the top of the inner wall; a lower inclined transition section is provided at the bottom of the inner wall of the modified cooling zone and is connected to the upper cone bucket, and the inclination angle of the lower inclined transition section is not less than the inclination angle of the upper cone bucket.

4. The method for improving the processing capacity of an existing dry coke quenching device according to claim 1, characterized in that: The method of increasing the height of the cooling zone specifically includes moving up a supporting brick plate between the cooling zone and the ramp zone for supporting the ramp zone.

5. The method for improving the processing capacity of an existing dry coke quenching device according to claim 1, characterized in that: It also includes changing the inclined channel area from a single inclined channel structure to a double inclined channel structure. Specifically, when the dry coke quenching unit is overhauled, all refractory masonry in the annular air duct area, the inclined channel area and the pre-storage area are removed and rebuilt; when rebuilding, a partition wall is built in the inclined channel area to change the single inclined channel to a double inclined channel; the height of the inclined channel area is increased, while the height of the annular air duct area is reduced, and the inner diameter of the inner ring wall of the annular air duct area and the inner diameter of the pre-storage area are both reduced.

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