Multifunctional connecting device for rotary kiln selenium evaporation system

Abstract

The utility model discloses a kind of multifunctional connecting devices for rotary kiln selenium steaming system, it is related to metallurgical technology field.The multifunctional connecting device for rotary kiln selenium steaming system, including absorption tower, adjusting device is fixedly connected on the absorption tower, adjusting device on first absorption tower and second absorption tower is respectively connected with one flue gas connecting pipe, connection flange is set between two flue gas connecting pipes, flue gas connecting pipe on first absorption tower is fixedly connected with absorption liquid inlet main pipe, two connecting pipe flushing inlet pipes are fixedly connected on absorption liquid inlet main pipe, two connecting pipe flushing inlet pipes are respectively fixedly connected with two flue gas connecting pipes, flue gas pipe is fixedly connected between second absorption tower and third absorption tower, flue gas outlet pipeline is fixedly connected on adjusting device on third absorption tower, connecting pipe structure is simple, can be flexibly adjusted, effectively avoid the influence of pipeline plugging on negative pressure in rotary kiln body, keep the continuous stable operation of rotary kiln body selenium steaming.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical technology, and in particular to a multifunctional connecting device for a rotary kiln selenium steaming system. Background Technology

[0002] Metallic selenium possesses unique physicochemical properties and is widely used in industries such as metallurgy, chemicals, and electronics. The anode mud produced by copper electrolysis is rich in selenium and is the primary raw material for selenium extraction. After the anode mud is pretreated to remove most of the impurity metals, selenium is extracted from the copper anode mud through a sulfation roasting process. The selenium compounds are converted into volatile selenium dioxide, which sublimates and evaporates at around 315°C. The mixture of selenium dioxide and water vapor generated during the rotary kiln roasting process enters the absorption tower and is reduced to crude selenium. In the existing process, the rotary kiln roasting and deselecution process involves a mixed gas entering the absorption tower in a negative pressure atmosphere of -3000Pa to -1000Pa. The absorption towers are connected by polypropylene flue gas pipes. Long-term production and operation can easily lead to problems such as selenium condensation and scaling blockage in the flue gas pipes, poor flue gas flow, and large fluctuations in the negative pressure of the rotary kiln. These problems require regular and frequent cleaning, which is labor-intensive and greatly affects the continuous and stable operation of the rotary kiln selenium removal system. Therefore, how to improve the flue gas connection device and enhance the stable operation of the rotary kiln has become an urgent problem to be solved. Utility Model Content

[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a multifunctional connecting device for a rotary kiln selenium steaming system, which can solve the above-mentioned problem.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a multi-functional connecting device for a rotary kiln selenium steaming system, comprising an absorption tower, wherein three absorption towers are provided, namely a first absorption tower, a second absorption tower and a third absorption tower, and an adjusting device is fixedly connected to each absorption tower. The adjusting devices on the first and second absorption towers are respectively connected to a flue gas connecting pipe. The first absorption tower has a fixed connection to the flue gas connection pipe with the absorbent liquid inlet pipe, which is fixedly connected to the flue gas connection pipe of the second absorption tower. Two flushing inlet pipes are fixedly connected to the absorbent liquid inlet pipe, and the other ends of the two flushing inlet pipes are fixedly connected to the inner side of the two flue gas connection pipes respectively. A flue gas pipe is fixedly connected between the second and third absorption towers, and a flue gas outlet pipe is fixedly connected to the regulating device on the third absorption tower. A reducing conduit is installed at the connection between the flushing inlet pipe and the flue gas connection pipe, and there is a reducing angle between the reducing conduit and the flue gas connection pipe.

[0005] Preferably, the flue gas connection pipe is L-shaped.

[0006] Preferably, the diameter-changing ratio of the variable-diameter conduit is 1:4 to 1:2, and the diameter-changing angle is 0° to 90°.

[0007] Preferably, an observation port is provided at the upper end of the flue gas connection pipe for observation and periodic disassembly and cleaning of the flue gas connection pipe.

[0008] Preferably, the absorbent is dispersed within the flue gas connecting pipe to achieve the effect of continuously flushing the inner wall of the flue gas connecting pipe, thereby preventing scaling and blockage on the inner wall.

[0009] Preferably, the absorbent inlet main pipe, the connecting pipe, the flushing inlet pipe, and the variable diameter conduit constitute a replenishment flushing variable diameter device.

[0010] Preferably, the flue gas connecting pipe is made of stainless steel and lined with polytetrafluoroethylene. The ratio of the diameter of the flue gas connecting pipe to the diameter of the absorption tower is 1:9 to 2:9, and the ratio of the thickness of the polytetrafluoroethylene coating to the diameter of the flue gas connecting pipe is 1:40 to 1:20, thereby ensuring that the flue gas connecting pipe has acid resistance.

[0011] Preferably, a connecting flange is provided between the two flue gas connecting pipes, and the two flue gas connecting pipes are connected by the connecting flange.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This multi-functional connecting device for the rotary kiln selenium steaming system adds an absorbent liquid inlet main pipe and a connecting pipe flushing inlet pipe. The absorbent liquid flowing out from the absorbent liquid inlet main pipe enters the flue gas connecting pipe through the connecting pipe flushing inlet pipe. The flushing liquid is dispersed inside the flue gas connecting pipe, continuously flushing and purifying the inner wall of the pipe. This not only solves the problem of internal scaling and blockage and ensures stable negative pressure operation, but also helps to improve the selenium reduction rate.

[0013] 2. This multi-functional connecting device for a rotary kiln selenium steaming system has a liquid replenishment and flushing diameter reducing device connected to both ends of the flue gas connecting pipe. The flushing inlet pipe enters the flue gas connecting pipe, and the diameter of the reducing pipe gradually increases. By adjusting the diameter ratio and the diameter angle, the liquid replenishment and flushing state of the absorbent in the flue gas connecting pipe can be adjusted according to the change in flue gas flow. The diameter angle can effectively adjust the dispersion angle and coverage area of ​​the absorbent, achieving the effect of uniformly flushing the inner wall of the connecting pipe.

[0014] 3. This multifunctional connecting device for a rotary kiln selenium steaming system ensures that the flue gas connecting pipe diameter is proportional to the absorption tower diameter, guaranteeing the smooth entry of flue gas into the absorption tower and ensuring the series connection of flue gas in each absorption tower. The ratio of the polytetrafluoroethylene coating thickness to the flue gas connecting pipe diameter ensures that the connecting pipe has strong acid resistance. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of a multifunctional connection device for a rotary kiln selenium steaming system according to the present invention. Figure 2 This is a cross-sectional schematic diagram of a multifunctional connecting device for a rotary kiln selenium steaming system according to the present invention. Figure 3 This is a cross-sectional schematic diagram of a multifunctional connecting device for a rotary kiln selenium steaming system according to the present invention. Figure 4 This is a cross-sectional schematic diagram of a multifunctional connecting device for a rotary kiln selenium steaming system according to the present invention.

[0016] Reference numerals in the attached drawings: 1. Absorption tower; 101. First absorption tower; 102. Second absorption tower; 103. Third absorption tower; 2. Absorbent liquid inlet main pipe; 3. Connecting pipe flushing inlet pipe; 4. Regulating device; 5. Flue gas connecting pipe; 6. Connecting flange; 7. Flue gas pipe; 8. Flue gas outlet pipe; 9. Variable diameter conduit; 10. Variable diameter angle. Detailed Implementation

[0017] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0021] Please see Figure 1-4 This utility model provides a technical solution: a multi-functional connecting device for a rotary kiln selenium steaming system, including an absorption tower 1, three absorption towers 1 are provided, namely a first absorption tower 101, a second absorption tower 102 and a third absorption tower 103, an adjusting device 4 is fixedly connected to each absorption tower 1, and the adjusting devices 4 on the first absorption tower 101 and the second absorption tower 102 are respectively connected to a flue gas connecting pipe 5, the flue gas connecting pipe 5 is L-shaped, a connecting flange 6 is provided between the two flue gas connecting pipes 5, and the two flue gas connecting pipes 5 are connected through the connecting flange 6; A liquid inlet pipe 2 is fixedly connected to the flue gas connection pipe 5 on the first absorption tower 101. The liquid inlet pipe 2 is fixedly connected to the flue gas connection pipe 5 on the second absorption tower 102. Two flushing inlet pipes 3 are fixedly connected to the liquid inlet pipe 2. The other ends of the two flushing inlet pipes 3 are fixedly connected to the inner side of the two flue gas connection pipes 5 respectively. A flue gas pipe 7 is fixedly connected between the second absorption tower 102 and the third absorption tower 103, and a flue gas outlet pipe 8 is fixedly connected to the regulating device 4 on the third absorption tower 103. A reducing pipe 9 is provided at the connection between each connecting pipe flushing inlet pipe 3 and flue gas connecting pipe 5. There is a reducing angle 10 between the reducing pipe 9 and flue gas connecting pipe 5. The absorbent inlet pipe 2, the connecting pipe flushing inlet pipe 3 and the reducing pipe 9 constitute a liquid replenishment flushing reducing device. The diameter-changing conduit 9 has a diameter-changing ratio of 1:4 to 1:2 and a diameter-changing angle of 10 from 0° to 90°. The absorbent is dispersed in the flue gas connecting pipe 5 to achieve the effect of continuous flushing of the inner wall of the flue gas connecting pipe 5, thereby preventing the inner wall from scaling and clogging. An observation port is opened at the upper end of the flue gas connecting pipe 5 for observation and periodic disassembly and cleaning of the flue gas connecting pipe 5. The flue gas connection pipe 5 is made of stainless steel and lined with polytetrafluoroethylene. The ratio of the diameter of the flue gas connection pipe 5 to the diameter of the absorption tower 1 is 1:9 to 2:9, and the ratio of the thickness of the polytetrafluoroethylene coating to the diameter of the flue gas connection pipe 5 is 1:40 to 1:20, thereby ensuring that the flue gas connection pipe 5 has acid resistance.

[0022] Working principle: The solid slag produced by the pretreatment process of copper anode mud enters the rotary kiln selenium steaming system. The generated flue gas is absorbed by the first absorption tower 101 and then enters the flue gas connecting pipe 5. At this time, the absorbent liquid enters the flue gas connecting pipe 5 through the absorbent liquid inlet pipe 2 and the connecting pipe flushing inlet pipe 3 at both ends to flush the flue gas connecting pipe 5. The absorbent is adjusted by the ratio of the diameter of the flue gas connecting pipe 5 to the diameter of the absorption tower 1 and the diameter change angle 10 to form different replenishment and flushing states. The flue gas entering from one end flows through the other end of the flue gas connecting pipe 5 and collides with the absorbent at the other end again. The absorbent is flushed and mixed with the flue gas again. The flue gas flows out of the flue gas connecting pipe 5 and enters the second absorption tower 102. Then it flows through the flue gas pipe 7 between the second absorption tower 102 and the third absorption tower 103. Finally, the exhaust gas is discharged through the flue gas outlet pipe 8. The flushed absorbent is treated and recycled in the system. The absorbent inlet pipe 2 and the flushing inlet pipe 3 were added. The absorbent flowing out from the absorbent inlet pipe 2 enters the flue gas connecting pipe 5 through the flushing inlet pipe 3. The flushing liquid is dispersed inside the flue gas connecting pipe 5 and continuously flushes and purifies the inner wall of the pipe. This not only solves the problem of internal scaling and blockage and ensures stable negative pressure operation, but also helps to improve the selenium reduction rate. The flue gas connecting pipe 5 is connected to a liquid replenishment and flushing diameter reducing device at both ends. The flushing inlet pipe 3 enters the flue gas connecting pipe 5. The diameter of the reducing conduit 9 increases from small to large. By adjusting the diameter ratio and diameter angle, the liquid replenishment and flushing state of the absorbent in the flue gas connecting pipe 5 can be adjusted according to the change of flue gas flow. The diameter angle 10 can effectively adjust the dispersion angle and coverage area of ​​the absorbent, so as to achieve the effect of uniformly flushing the inner wall of the connecting pipe. The ratio of the diameter of the flue gas connecting pipe 5 to the diameter of the absorption tower 1 ensures that the flue gas can smoothly enter the absorption tower 1 and guarantees the series connection of flue gas in each stage of the absorption tower 1. The ratio of the thickness of the polytetrafluoroethylene coating to the diameter of the flue gas connecting pipe 5 ensures that the connecting pipe has strong acid resistance.

[0023] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A multifunctional connecting device for a rotary kiln selenium distillation system, comprising an absorption tower (1), characterized in that: The absorption tower (1) is provided in three parts, namely the first absorption tower (101), the second absorption tower (102) and the third absorption tower (103). Each absorption tower (1) is fixedly connected to an adjustment device (4). The adjustment devices (4) on the first absorption tower (101) and the second absorption tower (102) are respectively connected to a flue gas connection pipe (5). The first absorption tower (101) has a flue gas connection pipe (5) fixedly connected to an absorbent liquid inlet pipe (2), the absorbent liquid inlet pipe (2) is fixedly connected to the flue gas connection pipe (5) on the second absorption tower (102), and two connecting pipe flushing inlet pipes (3) are fixedly connected to the absorbent liquid inlet pipe (2). The other ends of the two connecting pipe flushing inlet pipes (3) are fixedly connected to the inside of the two flue gas connection pipes (5) respectively. A flue gas pipe (7) is fixedly connected between the second absorption tower (102) and the third absorption tower (103), and a flue gas outlet pipe (8) is fixedly connected to the regulating device (4) on the third absorption tower (103). A reducing pipe (9) is provided at the connection between the flushing inlet pipe (3) and the flue gas connecting pipe (5), and there is a reducing angle (10) between the reducing pipe (9) and the flue gas connecting pipe (5).

2. The multifunctional connecting device for a rotary kiln selenium steaming system according to claim 1, characterized in that: The flue gas connection pipe (5) is L-shaped.

3. The multifunctional connecting device for a rotary kiln selenium steaming system according to claim 1, characterized in that: The diameter-changing conduit (9) has a diameter-changing ratio of 1:4 to 1:2 and a diameter-changing angle (10) of 0° to 90°.

4. A multifunctional connecting device for a rotary kiln selenium steaming system according to claim 1, characterized in that: An observation port is provided at the upper end of the flue gas connection pipe (5) for observation and periodic disassembly and cleaning of the flue gas connection pipe (5).

5. A multifunctional connecting device for a rotary kiln selenium steaming system according to claim 1, characterized in that: The absorbent is dispersed in the flue gas connecting pipe (5) to achieve the effect of continuously flushing the inner wall of the flue gas connecting pipe (5) with the absorbent, thereby preventing the inner wall from becoming clogged and blocked.

6. A multifunctional connecting device for a rotary kiln selenium steaming system according to claim 1, characterized in that: The absorbent inlet pipe (2), the connecting pipe flushing inlet pipe (3), and the variable diameter conduit (9) constitute a replenishment flushing variable diameter device.

7. A multifunctional connecting device for a rotary kiln selenium steaming system according to claim 1, characterized in that: The flue gas connecting pipe (5) is made of stainless steel and lined with polytetrafluoroethylene. The ratio of the diameter of the flue gas connecting pipe (5) to the diameter of the absorption tower (1) is 1:9 to 2:9, and the ratio of the thickness of the polytetrafluoroethylene coating to the diameter of the flue gas connecting pipe (5) is 1:40 to 1:20, thereby ensuring that the flue gas connecting pipe (5) has acid resistance.

8. A multifunctional connecting device for a rotary kiln selenium steaming system according to claim 1, characterized in that: A connecting flange (6) is provided between the two flue gas connecting pipes (5), and the two flue gas connecting pipes (5) are connected through the connecting flange (6).

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