CN107903918B - Air supply structure and air supply method of a vertical waste heat recovery device - Google Patents

Abstract

The invention relates to a gas supply structure and a gas supply method of a vertical waste heat recovery device. The gas supply structure includes a shaft furnace shell, an upper cone bucket, a lower cone bucket, an annular air duct, and a cross air duct; Air assembly and branch air supply assembly; the central air supply assembly is located directly below the intersection of the cross air duct, and the top of the central air supply assembly communicates with the cross air duct; the branch air supply assembly is located in the cross air duct Directly below the 4 branch air ducts, the top of the branch air supply assembly communicates with the corresponding branch air ducts. The invention can improve the uniformity of gas-solid heat exchange in the shaft furnace and the production efficiency of the shaft furnace.

Description

Air supply structure and air supply method of a vertical waste heat recovery device

technical field

The invention relates to the technical field of waste heat recovery, in particular to an air supply structure and an air supply method of a vertical waste heat recovery device.

Background technique

For the waste heat recovery of high-temperature solid materials, the shaft furnace has become the first choice in the field of waste heat recovery technology due to its high heat exchange efficiency, high waste heat quality, and small footprint. CDQ devices in the coking field and high-efficiency waste heat utilization systems for sintering ore etc. all use the shaft furnace as their core heat exchange equipment, among which the shaft furnace is the most widely used in CDQ production in the coking industry.

In the coke CDQ device, the gas supply device installed at the bottom of the shaft furnace (also known as CDQ furnace) has a great influence on the uniformity of coke drop and air distribution in the shaft furnace. If its structure is conducive to the uniform fall of the coke in the furnace in the circumferential direction and the uniform distribution of the cold circulating gas entering the shaft furnace in the circumferential direction of the shaft furnace, it is beneficial to realize the uniform cooling of the coke in the furnace, thereby improving the cooling of the shaft furnace performance, improve the cooling efficiency of the shaft furnace, reduce the dry quenching time of coke in the shaft furnace, reduce the volume of the cooling chamber of the shaft furnace and reduce the ratio of coke to gas per ton, thereby greatly reducing the construction investment and operation of the entire dry quenching device Cost; this effect will be more obvious for large-scale CDQ devices.

The Chinese patent with the application number 200710158949.4 (the application date is December 17, 2007) discloses "a special gas supply device for CDQ furnace", which consists of an upper cone bucket, a lower cone bucket, a CDQ furnace shell, Composed of annular air duct, cross air duct and central air cap, the upper cone bucket and the lower cone bucket cover are inserted together, and the ring-shaped gap formed by the inserting eaves forms a circular air duct. The center coincides with the center of the CDQ furnace and extends upward to communicate with the central air cap arranged on the upper part of the cone. The device adopts the air supply form combining the air supply from the outside to the inside by the peripheral air ring and the air supply from the inside to the outside by the central air cap from the upper part of the furnace body. The central air cap is arranged on the top of the cross air duct.

The Chinese patent with application number 201610263740.3 (application date is April 26, 2016) discloses "a multi-channel star-shaped gas supply device for CDQ furnace and coke cooling method in CDQ furnace". The wind and the air inlet of the central air cap are divided into multiple areas, and the star-shaped multi-air ducts are used to supply air to each area, which can realize the optimization of each air duct and the adjustment of local air supply, which is conducive to making the coke cooling in the CDQ furnace more efficient. uniform.

However, in the above air supply scheme, the central air caps are all set above the cross air ducts, and the central air caps occupy a part of the space in the cone bucket at the lower part of the shaft furnace, so that the materials on the upper part of the cross air ducts are blocked at the central air ducts. Forced to turn, resulting in uneven falling of materials in the shaft furnace, which will inevitably affect the uniformity of heat exchange between materials and circulating gas. In addition, the central air cap is located in the center of the shaft furnace. The circulating gas enters the central air cap upwards after passing through the cross air duct, and is forced to turn back downward after encountering the obstruction of the air cap. This process increases the pressure loss of the circulating gas and increases the working load of the circulating fan. At the same time, the concentrated circulation gas enters from the central area, which will also cause unbalanced airflow distribution in the nearby area, thereby affecting the uniformity of gas-solid heat exchange and reducing the production efficiency of the shaft furnace.

Contents of the invention

The invention provides a gas supply structure and a gas supply method of a vertical waste heat recovery device, which can improve the uniformity of gas-solid heat exchange in a shaft furnace and the production efficiency of the shaft furnace.

In order to achieve the above object, the present invention adopts the following technical solutions to realize:

A gas supply structure for a vertical waste heat recovery device, comprising a shaft furnace shell, an upper cone, a lower cone, an annular air channel, and a cross air channel; the upper cone and the lower cone are inserted together, and the upper cone The ring-shaped air duct is formed by the annular gap after the bucket and the lower cone are inserted; the cross air duct is horizontally arranged on the upper part of the lower cone, and its center coincides with the center of the shaft furnace; the upper cone, the lower cone and the shaft furnace shell The air chamber is divided into completely isolated upper and lower two-layer air chambers, wherein the upper air chamber communicates with the annular air duct, and the lower air chamber communicates with the cross air duct; it also includes a central air supply assembly and a branch air supply assembly; the central air supply The air component is located directly below the intersection of the cross air duct, and the top of the central air supply component communicates with the cross air duct; The top of the air component communicates with the corresponding branch air duct.

An air volume regulating plate is provided on the eaves between the upper cone bucket and the lower cone bucket.

The main bodies of the central air supply assembly and the branch air supply assembly are both tubular structures, the bottom of the main body is provided with a horizontal plate or wedge-shaped plate and a bottom opening is provided, and several side openings are arranged around the main body along the height direction. Correspondingly, a tapered baffle is set on the top.

The cross section of the main body of the central air supply assembly or the branch air supply assembly is circular or rectangular.

The main body diameter of the central air supply assembly is larger than the main body diameter of the branch air supply assembly, and the main body diameters of the central air supply assembly and the branch air supply assembly are matched with the size of the cross air duct at the corresponding installation position.

The angle between the slope of the tapered baffle and the horizontal plane is greater than the angle of repose of the material; C) Less than the angle of repose of the material.

A gas supply method for a vertical waste heat recovery device based on the gas supply structure, the external circulating gas enters the shaft furnace from the upper air chamber and the lower air chamber at the lower part of the shaft furnace respectively, wherein the gas entering the upper air chamber passes through the annular air duct The air entering the shaft furnace is supplied to the shaft furnace in the form of a peripheral air ring, and the air volume entering is adjusted by the air volume regulating plate; the gas entering the lower air chamber enters the cross air duct from four inlets arranged along the circumference of the cross air duct, and a part The gas gathers at the cross intersection of the cross air duct and enters the central air supply assembly below, and then the central air supply assembly enters the lower cone through the side opening and the bottom opening, and the other part of the gas enters under the branches of the cross air duct In the branch gas supply components of each branch gas supply component, it enters the lower cone bucket through the circumferential opening and the bottom opening on each branch gas supply component, which is used to uniformly cool the materials in the shaft furnace.

Compared with prior art, the beneficial effect of the present invention is:

1) The central air cap set above the cross air duct is canceled to make the material drop above the cross air duct more uniform. Below, it does not increase the hindrance and interference to the material in the shaft furnace, which is conducive to the uniform falling and uniform cooling of the material;

2) After the gas entering the cross air channel enters the central air supply assembly and the branch air supply assembly downward, it can directly enter the material layer, reducing the internal resistance of the air supply structure and reducing the energy consumption of the waste heat recovery system;

3) The gas in the lower air chamber is supplied to the shaft furnace through the cross air channel through the central gas supply assembly and a number of branch gas supply assemblies evenly distributed along the circumference, forming multiple points along the circumference and multiple points along the height of the gas. Layer feeding makes the distribution of gas in the lower cone more uniform, which is beneficial to the uniform cooling of materials and improves the production efficiency of the shaft furnace.

Description of drawings

Fig. 1 is a vertical central sectional view of an air supply structure of a vertical waste heat recovery device according to the present invention.

Fig. 2 is a view of A-A in Fig. 1 .

Fig. 3 is an enlarged view of part B in Fig. 1 .

In the figure: 1. Shaft furnace shell 2. Upper cone bucket 3. Lower cone bucket 4. Annular air duct 5. Cross air duct 6. Central air supply assembly 7. Branch air supply assembly 8. Upper air chamber 9. Lower air Chamber 10. Air volume adjustment plate 11. Conical baffle

Detailed ways

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

As shown in Figure 1 and Figure 2, the gas supply structure of a vertical waste heat recovery device according to the present invention includes a shaft furnace shell 1, an upper cone bucket 2, a lower cone bucket 3, an annular air duct 4, and a cross air duct 5; The upper cone bucket 2 and the lower cone bucket 3 are inserted together, and the annular gap formed after the upper cone bucket 2 and the lower cone bucket 3 are inserted forms an annular air duct 4; the cross air duct 5 is horizontally arranged on the lower cone bucket 3 The upper part, the center of which coincides with the center of the shaft furnace; the air chamber composed of the upper cone bucket 2, the lower cone bucket 3 and the shaft furnace shell 1 is divided into two completely isolated upper and lower layers of air chambers, of which the upper air chamber 8 and the annular air duct 4 are connected, and the lower air chamber 9 is connected with the cross air duct 5; it also includes a central air supply assembly 6 and a branch air supply assembly 7; the central air supply assembly 6 is located directly below the intersection of the cross air duct 5, The top of the central air supply assembly 6 communicates with the cross air duct 5; the branch air supply assembly 7 is located directly below the four branch air ducts forming the cross air duct 5, and the top of the branch air supply assembly 7 is connected to the corresponding branch air duct. connected.

An air volume regulating plate 10 is provided on the eaves between the upper cone bucket 2 and the lower cone bucket 3 .

As shown in Figure 3, the main bodies of the central air supply assembly 6 and the branch air supply assembly 7 are all tubular structures, the bottom of the main body is provided with a horizontal plate or wedge-shaped plate and has a bottom opening, and several horizontal plates are arranged around the main body along the height direction. The side opening is correspondingly provided with a tapered baffle 11 above the side opening.

The cross section of the main body of the central air supply assembly 6 or the branch air supply assembly 7 is circular or rectangular.

The main body diameter of the central air supply assembly 6 is larger than the main body diameter of the branch air supply assembly 7, and the main body diameters of the central air supply assembly 6 and the branch air supply assembly 7 match the size of the cross air duct 5 at the corresponding installation position.

The angle between the inclined surface of the conical baffle 11 and the horizontal plane is greater than the angle of repose of the material; the angle between the lower edge of the upper conical baffle and the upper edge of the lower conical baffle and the horizontal plane is smaller than the angle of repose of the material .

A gas supply method for a vertical waste heat recovery device based on the gas supply structure, the external circulating gas enters the shaft furnace from the upper gas chamber 8 and the lower gas chamber 9 at the lower part of the shaft furnace respectively, wherein the gas entering the upper gas chamber 8 passes through The annular air duct 4 enters the shaft furnace and supplies air to the shaft furnace in the form of a peripheral air ring, and the air volume entering is adjusted by the air volume regulating plate 10; The entrance enters the cross air duct 5, and a part of the gas gathers at the intersection of the cross air duct 5 and enters the central air supply assembly 6 below, and then the central air supply assembly 6 enters the lower cone 3 through the side opening and the bottom opening. Another part of the gas enters the branch gas supply assembly 7 below each branch of the cross air duct 5, and enters the lower cone bucket 3 through the circumferential opening and the bottom opening on each branch air supply assembly 7, and is used to clean the materials in the shaft furnace. Allow for even cooling.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (7)

1. A gas supply structure for a vertical waste heat recovery device, comprising a shaft furnace shell, an upper cone bucket, a lower cone bucket, an annular air duct, and a cross air duct; the upper cone bucket and the lower cone bucket are inserted together, The annular gap after the upper cone bucket and the lower cone bucket are inserted forms a circular air duct; the cross air duct is horizontally arranged on the upper part of the lower cone bucket, and its center coincides with the center of the shaft furnace; the upper cone bucket, the lower cone bucket and the shaft furnace shell The formed air chamber is divided into completely isolated upper and lower two-layer air chambers, in which the upper air chamber communicates with the annular air duct, and the lower air chamber communicates with the cross air duct; it is characterized in that it also includes central air supply components and branch air supply components assembly; the central air supply assembly is located directly below the intersection of the cross air duct, and the top of the central air supply assembly communicates with the cross air duct; the branch air supply assembly is located in the four branch air ducts forming the cross air duct Directly below, the top of the branch air supply assembly communicates with the corresponding branch air duct. 2. The air supply structure of a vertical waste heat recovery device according to claim 1, characterized in that an air volume regulating plate is provided on the eaves between the upper cone bucket and the lower cone bucket. 3. The air supply structure of a vertical waste heat recovery device according to claim 1, characterized in that the main bodies of the central air supply assembly and branch air supply assemblies are both tubular structures, and the bottom surface of the main body is provided with a horizontal plate or A wedge-shaped plate is provided with a bottom opening, several side openings are arranged around the main body along the height direction, and a tapered baffle is arranged correspondingly above the side openings. 4. The air supply structure of a vertical waste heat recovery device according to claim 3, wherein the cross section of the main body of the central air supply assembly or branch air supply assembly is circular or rectangular. 5. The air supply structure of a vertical waste heat recovery device according to claim 3, characterized in that, the diameter of the main body of the central air supply component is larger than that of the branch air supply components, and the central air supply component, branch The diameter of the main body of the air supply assembly matches the size of the cross air duct at the corresponding installation position. 6. The air supply structure of a vertical waste heat recovery device according to claim 3, characterized in that the angle between the inclined surface of the conical baffle and the horizontal plane is greater than the angle of repose of the material; the upper conical baffle The angle between the line connecting the lower edge of the lower edge and the upper edge of the lower tapered baffle and the horizontal plane is smaller than the angle of repose of the material. 7. A gas supply method based on the vertical waste heat recovery device of the gas supply structure according to claim 1, wherein the external circulating gas enters the shaft furnace respectively from the upper gas chamber and the lower gas chamber at the bottom of the shaft furnace, wherein The gas entering the upper air chamber enters the shaft furnace through the annular air duct to supply air to the shaft furnace in the form of a peripheral air ring, and the air volume entering is adjusted by the air volume regulating plate; the gas entering the lower air chamber is arranged circumferentially from the cross air duct The four inlets of the cross air channel enter the cross air duct, and part of the gas gathers at the cross intersection of the cross air duct and enters the central air supply assembly below, and then the central air supply assembly enters the lower cone through the side opening and the bottom opening, and the other part The gas enters the branch gas supply assembly under each branch of the cross air duct, and enters the lower cone bucket through the circumferential opening and bottom opening on each branch air supply assembly to uniformly cool the materials in the shaft furnace.

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