Roasting furnace outlet high-temperature flue gas sampling device and its use method

Abstract

The present invention discloses a high-temperature flue gas sampling device at the outlet of a roasting furnace and a method for using the same, comprising: a flue gas duct; a processing chamber; a driving device; a collecting pipe, wherein the collecting pipe is located in the processing chamber and connected to the driving device at one end and connected to the flue gas duct at the other end; an exhaust port, wherein the exhaust port is evenly distributed along the radial direction of the collecting pipe and is close to the driving device; a conical cover, wherein the conical cover is concentrically sleeved with the collecting pipe; a vertical partition, wherein the vertical partition is located in the processing chamber and divides the processing chamber into two cavities, and a through hole for the collecting pipe to pass through is provided in the middle of the vertical partition; a diversion port, wherein the diversion port is provided above the vertical partition and above the conical cover; and an outlet, wherein the outlet is provided above the end face of the processing chamber close to the flue gas duct. The beneficial effect of the present invention is that the driving device drives the collecting pipe to rotate, sucking in the high-temperature flue gas, which falls into the bottom of the processing chamber, and is discharged from the diversion port-outlet, with high separation efficiency and short time, and can process a large flow of high-temperature flue gas.

Description

Technical Field

[0001] The present invention relates to the field of sampling of flue gas at a roaster outlet in the pyrite acid-making industry, and in particular to a high-temperature flue gas sampling device at a roaster outlet and a use method thereof. Background Art

[0002] In the pyrite acid production industry, the oxygen concentration at the roaster outlet is an important process technology control indicator. However, due to the high dust content in the flue gas at the roaster outlet, direct sampling by general oxygen concentration analyzers is prone to blockage, causing the analyzer to fail to work properly and resulting in poor performance.

[0003] For example, Chinese invention patent publication number CN112304104B discloses an energy-saving optimization process for waste heat and waste gas of a roasting furnace, which includes the following steps: the flue gas generated by combustion in the roasting furnace is dedusted by a cyclone dust collector, the gas after dedusting is discharged upward along the exhaust pipe and enters the heat exchanger, the heat in the gas after dedusting is transferred to the water in the heat exchanger, the water with heat enters the heat exchange spiral tube 2, and transfers the heat to the air in the heat exchange spiral tube 1, the dust in the powder recovery tube also transfers the heat to the air in the heat exchange spiral tube 1 while moving, the air in the heat exchange spiral tube 1 is heated, and the heated air preheats the roasting furnace. This process relies on natural sedimentation of the dust collector for flue gas dust removal, but the natural sedimentation separation efficiency is low, the separation time is long, and the separation effect is poor.

[0004] Chinese utility model patent publication number CN211133390U discloses an exhaust dust removal device for an alumina circulating roasting furnace, comprising a circulating roasting furnace body, an air outlet box fixedly mounted on the right side of the circulating roasting furnace body, a delivery pipe fixedly connected to the bottom of the air outlet box, a dust removal box fixedly connected to the bottom of the delivery pipe, the left side of the dust removal box fixedly connected to the right side of the circulating roasting furnace body, an isolation block fixedly mounted on the inner bottom wall of the dust removal box, the bottom of the delivery pipe passing through the dust removal box and extending into the interior of the dust removal box, and the delivery pipe located on the left side of the isolation block. This device relies on spraying for dust removal, but the flue gas of this device is concentrated in the air outlet box, and without a circulating pipe, it is unable to handle large flows of flue gas. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the high-temperature flue gas at the outlet of the existing roasting furnace contains a large amount of dust, which cannot be effectively separated using traditional methods. To this end, a high-temperature flue gas sampling device at the outlet of the roasting furnace and a method for using the same are provided.

[0006] The technical solution of the present invention is: a high-temperature flue gas sampling device at the outlet of a roasting furnace, comprising: a flue gas duct; a processing chamber, the center of one end of the processing chamber is connected to the flue gas duct; a driving device, the driving device is installed at the other end of the processing chamber opposite to the flue gas duct; a collecting pipe, the collecting pipe is located in the processing chamber and is connected to the driving device at one end, and is connected to the flue gas duct at the other end; an exhaust port, the exhaust port is evenly distributed along the radial direction of the collecting pipe and is close to the driving device; a conical hood, the conical hood is concentrically sleeved with the collecting pipe, the conical hood covers the exhaust port and expands outward from the driving device to the flue gas duct; a vertical partition, the vertical partition is located in the processing chamber to divide the processing chamber into two cavities, and a through hole is provided in the middle of the vertical partition for the collection pipe to pass through; a guide port, the guide port is opened above the vertical partition and is located above the conical hood; an outlet, the outlet is opened above the end face of the processing chamber close to the flue gas duct.

[0007] An improvement of the above solution is that one end of the collecting pipe communicating with the flue gas pipe has an expansion portion that expands outward along the diameter, and the expansion portion covers the flue gas pipe.

[0008] In the above solution, the exhaust port is inclined toward the driving device.

[0009] A further improvement of the above solution is that the interior of the conical cover is provided with a hollow interlayer, and a coolant is injected into the hollow interlayer.

[0010] A further improvement of the above solution is that a cooling pipe is laid on at least one side of the vertical partition.

[0011] Another improvement of the above solution is that the vertical partition is in sliding cooperation with the processing chamber, and a compression spring is fixedly connected between the vertical partition and an end surface of the processing chamber close to the flue gas duct.

[0012] The method for using the high-temperature flue gas sampling device at the roasting furnace outlet includes the following steps: introducing the high-temperature flue gas discharged from the roasting furnace outlet into the flue gas duct, starting the driving device to drive the collection pipe to rotate, sucking the high-temperature flue gas into the collection pipe, and discharging it from the exhaust port after centrifugation. The discharged high-temperature flue gas collides with the conical cover, and the dust contained in it falls to the bottom of the processing chamber and accumulates. The high-temperature flue gas passes through the vertical partition from the guide port and is finally discharged from the outlet.

[0013] The beneficial effect of the present invention is that the collection pipe is driven to rotate by the driving device, the high-temperature flue gas is sucked in, and after preliminary centrifugal separation, it is discharged from the exhaust port. After colliding with the conical cover, the dust and the high-temperature flue gas are separated and fall into the bottom of the processing chamber. The high-temperature flue gas is discharged from the guide port-outlet. The separation efficiency is high, the separation time is short, and a large flow of high-temperature flue gas can be processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the high-temperature flue gas sampling device at the roasting furnace outlet of the present invention;

[0015] Figure 2 yes Figure 1 Schematic diagram of the collection pipeline;

[0016] Figure 3 yes Figure 1 Schematic diagram of the middle vertical partition;

[0017] Figure 4 Schematic diagram of a high-temperature flue gas sampling device at a roasting furnace outlet according to a preferred embodiment of the present invention;

[0018] In the figure, 1. flue gas duct, 2. processing chamber, 3. driving device, 4. collecting pipe, 5. exhaust port, 6. conical cover, 7. vertical partition, 8. guide port, 9. outlet, 10. expansion part, 11. compression spring. Implementation Method

[0019] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] like Figure 1-3As shown, the high-temperature flue gas sampling device at the roasting furnace outlet comprises: a flue gas duct 1, one end of the flue gas duct is connected to the roasting furnace outlet; a processing chamber 2, the center of one end of the processing chamber is connected to the other end of the flue gas duct; a driving device 3, the driving device is installed at the other end of the processing chamber opposite to the flue gas duct, and the driving device can be a motor; a collecting pipe 4, one end of the collecting pipe is connected to the driving device and the other end is connected to the flue gas duct, and the other end of the collecting pipe has a clearance fit with the flue gas duct, and the inner diameter of the collecting pipe can be slightly larger than the inner diameter of the flue gas duct to ensure that all the high-temperature flue gas can be sucked into the collecting pipe instead of being discharged directly from the outlet. In order to ensure the stability of the collection pipe rotation, the collection pipe is preferably made of a lightweight and high-temperature resistant material; an exhaust port 5 , the exhaust ports are evenly distributed along the radial direction of the collecting pipe and close to the driving device, the exhaust ports are evenly distributed on the circumference of the collecting pipe, the exhaust ports can be perpendicular to the circumference of the collecting pipe, but more preferably inclined toward the driving device; a conical cover 6, the conical cover is concentrically sleeved with the collecting pipe, the conical cover covers the exhaust ports and expands outward along the direction from the driving device to the flue gas pipe; a vertical partition 7, the vertical partition is located in the processing chamber to divide the processing chamber into two chambers, and a through hole is provided in the middle of the vertical partition for the collection pipe to pass through; a guide port 8, the guide port is opened above the vertical partition and above the conical cover, the guide port can be one or more; an outlet 9, the outlet is opened above the end face of the processing chamber close to the flue gas pipe.

[0021] The method for using the high-temperature flue gas sampling device at the roasting furnace outlet includes the following steps: introducing the high-temperature flue gas discharged from the roasting furnace outlet into the flue gas duct, starting the driving device to drive the collection pipe to rotate, sucking the high-temperature flue gas into the collection pipe, and discharging it from the exhaust port after centrifugation. The discharged high-temperature flue gas collides with the conical cover, and the dust contained in it falls to the bottom of the processing chamber and accumulates. The high-temperature flue gas passes through the vertical partition from the guide port and is finally discharged from the outlet and enters the sampling head for sampling.

[0022] As an embodiment of the present invention, one end of the collection pipe connected to the flue gas pipe has an expansion portion 10 that expands outward along the diameter. The expansion portion covers the flue gas pipe and completely covers the other end of the flue gas pipe to prevent the flue gas from overflowing.

[0023] As an embodiment of the present invention, the interior of the conical cover is provided with a hollow interlayer, and the hollow interlayer is injected with a coolant, so that when the high-temperature flue gas contacts the conical cover, it can be cooled.

[0024] As an embodiment of the present invention, a cooling pipe is laid on at least one side of the vertical partition, such as the left side or the right side of the vertical partition, or cooling pipes are laid on both sides of the vertical partition.

[0025] As a preferred embodiment of the present invention, the vertical partition is slidably engaged with the processing chamber, and a compression spring 11 is fixedly connected between the vertical partition and the end surface of the processing chamber near the flue gas duct. In this way, when too much high-temperature flue gas accumulates on the right side of the vertical partition, the vertical partition can be pushed to slide to the left, compressing the compression spring and relieving the pressure on the right side of the vertical partition. When the pressure of the compression spring is greater than the thrust of the high-temperature flue gas on the vertical partition, the vertical partition slides to the right again, and this cycle repeats.

Claims

1. The high-temperature flue gas sampling device at the roasting furnace outlet is characterized by: include: A flue gas duct (1); a processing chamber (2), wherein the center of one end of the processing chamber is connected to the flue gas duct; a driving device (3), wherein the driving device is installed at the other end of the processing chamber opposite to the flue gas duct; a collecting pipe (4), wherein one end of the collecting pipe is connected to the driving device in the processing chamber and the other end is connected to the flue gas duct; an exhaust port (5), wherein the exhaust port is evenly distributed along the radial direction of the collecting pipe and is close to the driving device; a conical cover (6), wherein the conical cover is concentrically sleeved with the collecting pipe, wherein the conical cover covers the exhaust port and expands outward in the direction from the driving device to the flue gas duct; a vertical partition (7), wherein the vertical partition is located in the processing chamber and divides the processing chamber into two chambers, and a through hole is provided in the middle of the vertical partition for the collection pipe to pass through; a diversion port (8), wherein the diversion port is provided above the vertical partition and above the conical cover; An outlet (9) is provided above the end face of the processing chamber close to the flue gas duct; one end of the collecting duct connected to the flue gas duct has an expansion portion (10) that expands outward along the diameter, and the expansion portion covers the flue gas duct; the vertical partition is slidably matched with the processing chamber, and a compression spring (11) is fixed between the vertical partition and the end face of the processing chamber close to the flue gas duct.

2. The roasting furnace outlet high-temperature flue gas sampling device according to claim 1, characterized in that: The exhaust port is inclined toward the driving device.

3. The high-temperature flue gas sampling device at the roasting furnace outlet according to claim 1, characterized in that: The conical cover has a hollow interlayer inside, and the hollow interlayer is injected with cooling liquid.

4. The roasting furnace outlet high-temperature flue gas sampling device according to claim 1, characterized in that: A cooling pipe is laid on at least one side of the vertical partition.

5. The method for using the roasting furnace outlet high-temperature flue gas sampling device according to any one of claims 1 to 4, characterized in that: The following steps are involved: The high-temperature flue gas discharged from the roasting furnace outlet is introduced into the flue gas duct, and the driving device is started to drive the collection pipe to rotate, so that the high-temperature flue gas is sucked into the collection pipe and discharged from the exhaust port after centrifugation. The discharged high-temperature flue gas collides with the conical cover, and the dust contained in it falls to the bottom of the processing chamber and accumulates. The high-temperature flue gas passes through the vertical partition from the guide port and is finally discharged from the outlet.

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