Spray gun system of double-chamber shaft kiln

Abstract

The utility model relates to a double-hearth shaft kiln spray gun system which comprises a left kiln hearth and a right kiln hearth, and combustion-supporting air inlets are formed in the top of the left kiln hearth and the top of the right kiln hearth. A plurality of annular pipes are arranged on the upper portion of the left kiln chamber and the upper portion of the right kiln chamber, a plurality of spray guns are arranged on each annular pipe, and nozzles of the spray guns face upwards. The circle center of each annular pipe is located on the center line of the left kiln chamber or the right kiln chamber. The spray gun is an L-shaped round pipe. The multiple spray guns are arranged, the muzzle directions of the spray guns are changed, the flow direction of fuel sprayed by the spray guns and the flow direction of combustion-supporting air form reverse flow, the fuel and the combustion-supporting air flow are evenly mixed, and the problem that the fuel and the air flow are not evenly distributed is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical lime production, in particular to a double-chamber vertical kiln spray gun system. Background Art

[0002] The double-chamber vertical kiln has mature and advanced calcination principles and control technologies, and is recognized as an advanced kiln type in the lime production industry. The main body of the double-chamber vertical kiln consists of two vertical kiln chambers that are mirror images of each other. The calcination chamber flue gas first passes through the preheating chamber to preheat the room temperature material before being discharged from the kiln chamber. Therefore, it has a high thermal energy utilization efficiency, and its unit product heat consumption is the lowest among similar products. It is currently the most widely used kiln type in newly built lime kilns.

[0003] However, in the existing double-chamber lime kiln, there is an unreasonable setting of the spray gun, which leads to uneven distribution of the fuel on the cross section of the kiln chamber, which directly leads to uneven temperature on the cross section. The temperature at the location where more fuel is distributed is higher, resulting in overburning, while the temperature at the location where less fuel is distributed is lower, resulting in the limestone failing to reach the decomposition temperature, causing raw burning. Raw burning or overburning will affect the production quality of the lime kiln.

[0004] The Chinese patent with the announcement number CN209166064U provides a fuel uniform distribution device for a regenerative double-chamber vertical kiln, which evenly arranges each spray gun on the vertical kiln, and can provide a relatively stable, uniform and reliable heat source for the vertical kiln. In order to improve the uniformity of the airflow at the spray gun, the number of spray guns is usually increased and evenly arranged, but the fuel and air flow will still be unevenly distributed under the spray gun. Summary of the invention

[0005] In order to overcome the defects of the prior art, the utility model provides a double-bore vertical kiln spray gun system and an application method thereof. The utility model sets a plurality of spray guns and changes the muzzle direction of the spray guns so that the flow direction of the fuel sprayed from the spray guns and the flow direction of the combustion-supporting air form a countercurrent, which is beneficial to the uniform mixing of the fuel and the combustion-supporting air flow and solves the problem of uneven distribution of the fuel and air flow.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A double-chamber vertical kiln spray gun system comprises a left kiln chamber and a right kiln chamber, wherein the tops of the left kiln chamber and the right kiln chamber are both provided with combustion-supporting air inlets; the upper parts of the left kiln chamber and the right kiln chamber are both provided with a plurality of annular tubes, each of which is provided with a plurality of spray guns, and the nozzles of the spray guns are directed upward; the center of each annular tube is on the center line of the left kiln chamber or the right kiln chamber; and the spray guns are L-shaped circular tubes.

[0008] The angle between the nozzle of the spray gun and the vertical direction is -22.5° to +22.5°.

[0009] A guide cap is arranged at the nozzle of the spray gun; the guide cap comprises an upper cap and a lower cap, both of which are conical structures, and the two conical bottom surfaces are fixedly connected; the guide cap is fixedly connected to the nozzle of the spray gun through a bracket.

[0010] The number of the annular tubes is 3 to 5, and the number of spray guns on the annular tubes gradually increases from the center of the left kiln chamber or the right kiln chamber to the side wall of the left kiln chamber or the right kiln chamber.

[0011] The multiple annular tubes are arranged on the same horizontal plane or in upper and lower layers; when arranged in upper and lower layers, the vertical distance between two adjacent annular tubes is 40 to 60 centimeters.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1) The utility model sets a plurality of spray guns and changes the muzzle direction of the spray guns, so that the flow direction of the fuel sprayed from the spray guns and the flow direction of the combustion-supporting air form a countercurrent, which is beneficial to the uniform mixing of the spray gun fuel and the combustion-supporting air flow, and can burn fully, thereby improving the production quality of the lime kiln.

[0014] 2) The utility model sets a guide cap at the nozzle of the spray gun, which plays a guiding role on the one hand, so that the sprayed fuel is dispersed and mixed evenly with the combustion-supporting air; on the other hand, it can prevent the mixed air flow formed after the combustion of fuel and air from flowing back into the spray gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the structure of a double-chamber vertical kiln spray gun system of the utility model. Figure 1 .

[0017] Figure 2 This is a schematic diagram of the structure of a double-chamber vertical kiln spray gun system of the utility model. Figure 2 .

[0018] Figure 3 It is a structural sectional view of a flow guide cap of the utility model.

[0019] Figure 4 It is an airflow distribution diagram of a kiln chamber cross section in which the flow direction of the spray gun fuel and the flow direction of the combustion-supporting air are in the same direction in the prior art;

[0020] Figure 5 It is the airflow distribution diagram of the cross section of the kiln chamber in which the flow direction of the spray gun fuel and the flow direction of the combustion-supporting air are countercurrent in the utility model;

[0021] Description of reference numerals:

[0022] In the figure: 1-left kiln chamber 2-right kiln chamber 3-annular pipe 4-spray gun 5-flow guide cap 6-connecting channel 51-upper cap 52-lower cap 53-bracket DETAILED DESCRIPTION

[0023] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0024] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0025] See Figures 1 to 3 As shown, the utility model relates to a double-chamber vertical kiln spray gun system, comprising a left kiln chamber 1 and a right kiln chamber 2, and a combustion air inlet is provided on the top of the left kiln chamber 1 and the right kiln chamber 2. A plurality of annular tubes 3 are provided on the upper part of the left kiln chamber 1 and the right kiln chamber 2, and a plurality of spray guns 4 are provided on each annular tube 3, and the nozzle of the spray gun 4 is directed upward. The center of each annular tube 3 is on the center line of the left kiln chamber 1 or the right kiln chamber 2. The spray gun 4 is an L-shaped circular tube. The angle between the nozzle of the spray gun 4 and the vertical direction is 0°. The number of annular tubes 3 is 4. From the center of the left kiln chamber 1 or the right kiln chamber 2 to the side wall of the left kiln chamber 1 or the right kiln chamber 2, the number of spray guns 4 on the annular tube 3 gradually increases, which are 5, 5, 10 and 15 spray guns respectively. The 4 annular tubes 3 are arranged on the same horizontal plane.

[0026] A guide cap 5 is provided at the nozzle of the spray gun 4. The guide cap 5 includes an upper cap 51 and a lower cap 52, both of which are conical structures, and the two conical bottom surfaces are fixedly connected. The guide cap 5 is fixedly connected to the nozzle of the spray gun 4 through a bracket 53. The conical side of the lower cap 52 can play a guiding role and disperse the fuel sprayed from the spray gun 4. The conical side of the upper cap 51 can disperse the combustion-supporting air from top to bottom, so that the fuel and the combustion-supporting air are fully and evenly mixed and burned during the countercurrent movement. The guide cap 5 as a whole can prevent the mixed airflow after the mixed combustion from flowing back into the spray gun.

[0027] An application method of a double-chamber vertical kiln spray gun system, the specific steps are as follows:

[0028] (1) When the left kiln chamber starts to work, the combustion air enters the left kiln chamber from the top of the left kiln chamber, and the fuel enters the spray gun through the annular pipe. The spray gun sprays upward into the left kiln chamber, and the fuel and the combustion air are fully mixed and burned, forming a mixed airflow after combustion;

[0029] (2) The mixed air flows downward, mixes with the cooling air flowing into the left kiln chamber, passes through the connecting passage between the left kiln chamber and the right kiln chamber, enters the right kiln chamber, mixes with the cooling air flowing into the right kiln chamber, flows upward, and is discharged from the top of the right kiln chamber;

[0030] (3) Double-bore vertical kiln reversing calcination, repeating the above steps (1) to (3) but in the opposite direction.

[0031] The fuel is natural gas, coal gas or mixed gas.

[0032] Figure 4 and Figure 5 This is the airflow distribution diagram of the cross section at the same position of the spray gun in the kiln chamber. Figure 4 The spray gun muzzle is pointed downward. Figure 5 The spray gun muzzle is pointed upward. Standard deviation is the most commonly used quantitative form to reflect the degree of dispersion of a set of data, and is also often used to evaluate uniformity. Figure 4 The standard deviation of the air flow velocity in the plane shown is 3.05 m / s. Figure 5 The standard deviation of the plane airflow velocity is 0.9m / s. The standard deviation of the plane airflow velocity is reduced by 70.5% when the spray gun muzzle is upward compared to when the spray gun muzzle is downward, that is, when the spray gun muzzle is upward, the fuel flow direction sprayed from the spray gun forms a countercurrent with the combustion air flow direction, which is conducive to the uniform mixing of the spray gun fuel and the combustion air flow, and effectively improves the uniformity of the airflow at the spray gun.

[0033] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. In addition, the various different embodiments of the present invention can also be arbitrarily combined, as long as they do not violate the idea of ​​the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A double-chamber vertical kiln spray gun system, comprising a left kiln chamber and a right kiln chamber, wherein the tops of the left kiln chamber and the right kiln chamber are both provided with combustion air inlets; characterized in that: A plurality of annular tubes are arranged on the upper part of the left kiln chamber and the right kiln chamber, and a plurality of spray guns are arranged on each annular tube, and the nozzles of the spray guns are directed upward; the center of each annular tube is on the center line of the left kiln chamber or the right kiln chamber; the spray guns are L-shaped circular tubes.

2. A double-chamber vertical kiln spray gun system according to claim 1, characterized in that: The angle between the nozzle of the spray gun and the vertical direction is -22.5° to +22.5°.

3. A double-chamber vertical kiln spray gun system according to claim 1, characterized in that: A guide cap is arranged at the nozzle of the spray gun; the guide cap comprises an upper cap and a lower cap, both of which are conical structures, and the two conical bottom surfaces are fixedly connected; the guide cap is fixedly connected to the nozzle of the spray gun through a bracket.

4. A double-chamber vertical kiln spray gun system according to claim 1, characterized in that: The number of the annular tubes is 3 to 5, and the number of spray guns on the annular tubes gradually increases from the center of the left kiln chamber or the right kiln chamber to the side wall of the left kiln chamber or the right kiln chamber.

5. A double-chamber vertical kiln spray gun system according to claim 1, characterized in that: The multiple annular tubes are arranged on the same horizontal plane or in upper and lower layers; when arranged in upper and lower layers, the vertical distance between two adjacent annular tubes is 40 to 60 centimeters.

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