Single I-shaped pipeline structure suitable for zinc rectifying furnace

Abstract

The utility model discloses a simple I-shaped pipeline structure suitable for a zinc rectifying furnace, which comprises a preheating air pipeline and a flue gas pipeline, the preheating air pipeline comprises a main air pipeline and a plurality of groups of horizontal branch air pipelines communicated with the main air pipeline, and the horizontal branch air pipelines are respectively an upper-layer air pipeline, a middle-layer air pipeline and a lower-layer air pipeline. The upper-layer air pipeline, the middle-layer air pipeline and the main air pipeline form an I-shaped structure; the upper-layer air pipeline, the middle-layer air pipeline and the lower-layer air pipeline are connected with the multi-distributed air nozzles and arranged in a 6 + 7 + 6 mode, the flow uniformity of the single-layer air nozzles can be improved through the multi-distributed air nozzles, and mixed combustion of natural gas and air can be enhanced. The upper air nozzles are large in size, the middle air nozzles are large in number, and the furnace top temperature can be increased by increasing the air amount at the top of the hearth; the flue gas pipeline comprises a main flue gas pipeline and a horizontal branch flue gas pipeline, the flow uniformity is improved by adjusting the flow area of a flue gas outlet, and a hearth flow field and a temperature field can be effectively improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of tower-type zinc distillation furnaces, and relates to a single I-shaped pipe structure suitable for zinc distillation furnaces. Background Technology

[0002] In the combustion chamber of a tower-type zinc distillation furnace, air is passively drawn into the combustion chamber through the air nozzle 121 of the preheated air duct by the suction force of the blower to participate in the combustion of natural gas. The flue gas produced by combustion also flows out of the combustion chamber through the flue gas outlet at the bottom of the combustion chamber under the suction force. Numerical simulation calculations were performed on the existing gas pipeline to analyze its flow field information. However, for the gas pipeline structure of the tower-type zinc distillation furnace, the structure of the air duct directly affects the air entering the furnace, and the structure of the flue gas duct directly affects the flow field inside the furnace, thus affecting the combustion of natural gas in the combustion chamber. This leads to incomplete combustion of natural gas in the combustion chamber, which will adversely affect the actual production of the tower-type zinc distillation furnace. Summary of the Invention

[0003] In order to overcome at least one deficiency of the prior art, this utility model provides a single I-shaped pipe structure suitable for zinc distillation furnaces.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a single I-shaped pipe structure suitable for zinc distillation furnace, including a preheating air pipe and a flue gas pipe. The preheating air pipe includes a main air pipe and multiple sets of horizontal branch air pipes connected to it. The horizontal branch air pipes are respectively an upper air pipe, a middle air pipe and a lower air pipe. The upper air pipe, the middle air pipe and the main air pipe constitute an I-shaped structure.

[0005] Furthermore, the upper air duct is provided with a plurality of upper air nozzles, the middle air duct is provided with a plurality of middle air nozzles, and the lower air duct is provided with a plurality of lower air nozzles. The plurality of upper air nozzles have the same flow area, the plurality of middle air nozzles have the same flow area, and the plurality of lower air nozzles have the same flow area.

[0006] Furthermore, the flow area of ​​the upper air nozzle is larger than that of the middle air nozzle and the lower air nozzle.

[0007] Furthermore, the ratio of the number of upper air nozzles, middle air nozzles, and lower air nozzles is 6:7:6.

[0008] Furthermore, the main air duct is connected to a first branch pipe and a second branch pipe, and a third branch pipe is provided between the upper air duct and the middle air duct, and the two are connected through the third branch pipe. The first branch pipe is connected to the third branch pipe, and the second branch pipe is connected to the lower air duct.

[0009] Furthermore, the flue gas duct includes a main flue gas duct and a horizontal branch flue gas duct. The main flue gas duct is connected to the horizontal branch flue gas duct. The horizontal branch flue gas duct is provided with a number of flue gas nozzles. The flow area of ​​the number of flue gas nozzles gradually increases from the end closer to the main flue gas duct to the end farther away from the main flue gas duct.

[0010] Furthermore, the width of several of the flue gas nozzles is equal, and their height gradually increases from the end closest to the main flue gas duct to the end furthest from the main flue gas duct.

[0011] Furthermore, a flow regulating valve is installed at the connection between the main air duct and the second branch pipe.

[0012] In summary, the advantages of this utility model are:

[0013] The upper, middle, and main air ducts of this invention form an I-shaped structure. These ducts are connected to multiple distributed air nozzles in a "6+7+6" arrangement. This multi-distributed arrangement of air nozzles effectively improves the flow uniformity of a single layer of air nozzles while meeting engineering construction requirements, thus enhancing the mixing and combustion of natural gas and air within the furnace. The upper air ducts connect to larger air nozzles, and the middle air nozzles are more numerous than the lower ones. This design increases the air volume at the top and upper-middle parts of the furnace, which helps to raise the furnace top temperature. The flue gas ducts include a main flue gas duct and horizontal branch flue gas ducts. The horizontal branch flue gas ducts connect to four flue gas outlets. By adjusting the flow area of ​​the four flue gas outlets, the flow rate at the outlets is kept uniform, effectively improving the uniformity of the overall flow and temperature field in the combustion chamber and increasing the heat transfer efficiency between the high-temperature flue gas and the trays. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the gas pipeline structure of this utility model.

[0015] Figure 2 This is a trace diagram of natural gas and air in the combustion chamber of a zinc distillation furnace using the original gas pipeline structure.

[0016] Figure 3 This is a trace diagram of natural gas and air in the combustion chamber of a zinc distillation furnace using the gas pipeline structure of this utility model.

[0017] Figure 4 This is an isosurface diagram of the 1% volume fraction of natural gas and air in the combustion chamber of a zinc distillation furnace using the original gas pipeline structure.

[0018] Figure 5 This is an isosurface diagram of the 1% volume fraction of natural gas and air in the combustion chamber of a zinc distillation furnace employing the gas pipeline structure of this invention.

[0019] Figure 6 This is a temperature distribution cloud map of the longitudinal monitoring section of the combustion chamber of a zinc distillation furnace using the original gas pipeline structure.

[0020] Figure 7 This is a temperature distribution cloud map of the longitudinal monitoring section of the combustion chamber of a zinc distillation furnace using the gas pipeline structure of this utility model.

[0021] Figure 8 This is a temperature distribution cloud map of the outer wall surface of the zinc distillation furnace tray using the original gas pipeline structure.

[0022] Figure 9 This is a temperature distribution cloud map of the outer wall surface of the zinc distillation furnace tray using the gas pipeline structure of this utility model. Detailed Implementation

[0023] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0024] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0025] In this embodiment of the invention, all directional indicators (such as up, down, left, right, front, back, horizontal, vertical, etc.) are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0026] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of this utility model may actually be an approximate parallel relationship, and the perpendicular relationship may actually be an approximate perpendicular relationship.

[0027] Example 1:

[0028] like Figure 1As shown, a single I-shaped pipe structure suitable for zinc distillation furnace includes a preheating air pipe 1 and a flue gas pipe 2. The preheating air pipe includes a main air pipe 11 and multiple sets of horizontal branch air pipes connected to it. The horizontal branch air pipes are an upper air pipe 12, a middle air pipe 13 and a lower air pipe 14. The upper air pipe 12, the middle air pipe 13 and the main air pipe 11 form an I-shaped structure.

[0029] The upper air duct 12 is provided with several upper air nozzles 121, the middle air duct 13 is provided with several middle air nozzles 131, and the lower air duct 14 is provided with several lower air nozzles 141. Air enters the preheated air duct 1 under the action of the fan. The air flows from the main air duct 11 into the upper air duct 12, the middle air duct 13 and the lower air duct 14 respectively, and is then ejected through the upper air nozzles 121, the middle air nozzles 131 and the lower air nozzles 141.

[0030] In this embodiment, there are six upper air nozzles 121 arranged horizontally, seven middle air nozzles 131 arranged horizontally, and six lower air nozzles 141 arranged horizontally. The flow areas of each upper air nozzle 121, each middle air nozzle 131, and each lower air nozzle 141 are the same. The air duct has an I-shaped structure, and the upper air nozzles 121, middle air nozzles 131, and lower air nozzles 141 are arranged horizontally. The multi-dispersed arrangement of the air nozzles ensures uniform flow rate of the single-layer air nozzles, which is beneficial for enhancing the mixing and combustion of natural gas and air in the furnace. Furthermore, the flow area of ​​the upper air nozzle 121 is larger than that of the middle air nozzle 131 and the lower air nozzle 141. Preferably, the flow areas of the middle air nozzle 131 and the lower air nozzle 141 are the same. By controlling the flow area between different layers and adjusting the number of air nozzles, the amount of air at the top of the combustion chamber is effectively increased, which is beneficial for increasing the temperature at the top of the furnace and is more in line with the smelting process.

[0031] The structure connecting the main air duct 11 with multiple sets of horizontal branch air ducts is as follows:

[0032] The main air duct 11 is connected to a first branch pipe 111 and a second branch pipe 112. A third branch pipe 120 is provided between the upper air duct 12 and the middle air duct 13, and the two are connected through the third branch pipe 120. The first branch pipe 111 is connected to the third branch pipe 120, and the second branch pipe 112 is connected to the lower air duct 14. A flow regulating valve (not shown in the figure) is provided at the connection between the main air duct 11 and the second branch pipe 112. Air enters the preheated air duct 1 under the action of the fan. Part of the air flows through the main air duct 11, through the first branch pipe 111 and the third branch pipe 120 into the upper air duct 12 and the middle air duct 13. The other part of the air enters the second branch pipe 112 through the flow regulating valve and then enters the lower air duct 14. The flow regulating valve can control the amount of gas entering the second branch pipe 112, thereby ensuring that the gas flow entering the lower air duct 14 meets the process requirements.

[0033] The flue gas duct 2 includes a main flue gas duct 21 and a horizontal branch flue gas duct 22. The main flue gas duct 21 is connected to the horizontal branch flue gas duct 22. The horizontal branch flue gas duct 22 is provided with a plurality of flue gas nozzles 221. The flow area of ​​the plurality of flue gas nozzles 221 gradually increases from the end near the main flue gas duct 21 to the end away from the main flue gas duct 21. Preferably, the width of the plurality of flue gas nozzles 221 is equal, and the height gradually increases from the end near the main flue gas duct 21 to the end away from the main flue gas duct 21. In this embodiment, by adjusting the flow area of ​​each flue gas nozzle 221, the flow uniformity of the flue gas outlet can be maintained. That is, by changing the proportion of the flow area of ​​each flue gas nozzle 221, the flow uniformity can be adjusted, which is conducive to adjusting the overall flow field of the combustion chamber, avoiding the uneven temperature field caused by the uneven flow of high-temperature flue gas, and effectively improving the heat transfer efficiency between high-temperature flue gas and the tray.

[0034] Effect Analysis:

[0035] Numerical simulations were performed on the original gas pipeline structure (original structure) and the gas pipeline structure of this embodiment (new structure) to analyze their flow field information. For example... Figures 2-3 The image shown is a trace diagram of natural gas and air in the combustion chamber of a zinc distillation furnace. Figure 2 This is a trace diagram of the original gas pipeline structure. Figure 3 This is a trace diagram of the gas pipeline structure in this embodiment. The red curve represents the trajectory of natural gas, and the blue curve represents the trajectory of air. Figure 2 It can be seen that the natural gas is mainly concentrated near the burner inlet, while the air is mainly concentrated near the air nozzle and diffuses throughout the furnace. Figure 3The accumulation of natural gas in the area below the second burner has significantly disappeared, and the uniformity of the natural gas and air trace distribution near the flue gas outlet has significantly increased. This indicates that the natural gas and air in the combustion chamber of the zinc distillation furnace with the gas pipeline structure of this embodiment have a better degree of mixing and combustion state, which is beneficial to heat transfer.

[0036] Figures 4-5 This is an isosurface plot of natural gas and air at 1% volume fraction in the combustion chamber of a zinc distillation furnace, obtained by... Figures 4-5 It directly reflects the mixing state of natural gas and air in the combustion chamber. Figure 4 This is an isosurface diagram of the original gas pipeline structure. Figure 5 This is an isosurface diagram of the gas pipeline structure in this embodiment, obtained through... Figures 4-5 The comparison shows that when the zinc distillation furnace adopts the gas pipeline structure of this embodiment, the area of ​​natural gas and air mixing in the combustion chamber is significantly expanded, the large unmixed area in the lower part of the combustion chamber is significantly improved, the mixing of natural gas and air in the furnace is enhanced, and the combustion of natural gas is effectively promoted.

[0037] Figures 6-7 This is a temperature distribution cloud map of the longitudinal monitoring section of the combustion chamber of a zinc distillation furnace. Figure 6 This is a temperature distribution cloud map of the original gas pipeline structure. Figure 7 This is a temperature distribution cloud map of the gas pipeline structure in this embodiment, obtained through... Figures 6-7 The comparison shows that when the zinc distillation furnace adopts the gas pipeline structure of this embodiment, the flue gas temperature in the combustion chamber is significantly increased, and the area of ​​the high-temperature zone is significantly expanded. The low-temperature zone in the lower part of the combustion chamber caused by natural gas accumulation is basically eliminated, and the low-temperature zones at the top and bottom of the combustion chamber are also effectively improved. In addition, the uniformity of the combustion chamber temperature distribution is substantially improved, which is beneficial to the heat transfer between the flue gas and the tray.

[0038] Figures 8-9 This is a temperature distribution cloud map of the outer wall surface of the zinc distillation furnace trays. An overall increase in the tray wall temperature directly reflects an increase in the zinc distillation furnace's output. Figure 8 This is a temperature distribution cloud map of the original gas pipeline structure. Figure 9 This is a temperature distribution cloud map of the gas pipeline structure in this embodiment, obtained through... Figures 8-9 The comparison shows that when the zinc distillation furnace adopts the gas pipeline structure of this embodiment, the area of ​​the high-temperature zone on the tray wall is significantly increased, especially in the lower part of the tray, while the low-temperature zone is significantly reduced, and the overall temperature is effectively improved, which is conducive to the evaporation of zinc liquid in the tray and the increase of refined zinc production.

[0039] Table 1 compares the air nozzle flow rates of each layer in the zinc distillation furnace, and Table 2 compares key data of the zinc distillation furnace. Tables 1 and 2 allow for a quantitative analysis of the effect of the gas pipeline structure in this embodiment. Table 1 shows that the standard deviation of the flow rate ratio of the air nozzles in the upper air pipeline 12 and the middle air pipeline 13 both decreased, indicating that the uniformity of flow distribution was improved. Table 2 shows that, compared to the original gas pipeline structure, the average heat flux density of the trays increased by 12.34% after adopting the gas pipeline structure of this embodiment. Combined with other parameters, it can be seen that the key parameters of combustion and heat transfer were improved overall, indicating that the furnace condition of the zinc distillation furnace using the gas pipeline structure of this embodiment was significantly improved.

[0040] Table 1

[0041]

[0042] Table 2

[0043]

[0044] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort should fall within the scope of protection of this utility model.

Claims

1. A single-I-shaped pipe structure suitable for zinc distillation furnaces, characterized in that: The system includes a preheated air duct and a flue gas duct. The preheated air duct includes a main air duct and multiple sets of horizontal branch air ducts connected to it. The horizontal branch air ducts are respectively an upper air duct, a middle air duct, and a lower air duct. The upper air duct, the middle air duct, and the main air duct form an I-shaped structure. The upper air duct is provided with several upper air nozzles, the middle air duct is provided with several middle air nozzles, and the lower air duct is provided with several lower air nozzles. The flow areas of the upper air nozzles, the middle air nozzles, and the lower air nozzles are all the same. The flow area of ​​the upper air nozzles is greater than that of the middle air nozzles and the lower air nozzles. The ratio of the number of upper air nozzles, middle air nozzles, and lower air nozzles is 6:7:

6.

2. The single-I-shaped pipe structure suitable for zinc distillation furnaces according to claim 1, characterized in that: The main air duct is connected by a first branch pipe and a second branch pipe. A third branch pipe is provided between the upper air duct and the middle air duct, and the two are connected through the third branch pipe. The first branch pipe is connected to the third branch pipe, and the second branch pipe is connected to the lower air duct.

3. The single-I-shaped pipe structure suitable for zinc distillation furnaces according to claim 1, characterized in that: The flue gas duct includes a main flue gas duct and horizontal branch flue gas ducts. The main flue gas duct is connected to the horizontal branch flue gas ducts. The horizontal branch flue gas ducts are provided with several flue gas nozzles. The flow area of ​​the several flue gas nozzles gradually increases from the end closer to the main flue gas duct to the end farther away from the main flue gas duct.

4. A single-I-shaped pipe structure suitable for zinc distillation furnaces according to claim 3, characterized in that: The width of several of the flue gas nozzles is equal, and their height gradually increases from the end closest to the main flue gas duct to the end furthest from the main flue gas duct.

5. A single-I-shaped pipe structure suitable for zinc distillation furnaces according to claim 3, characterized in that: A flow regulating valve is installed at the connection between the main air duct and the second branch pipe.

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