A tail gas combustion furnace

Abstract

This invention belongs to the field of exhaust gas treatment technology, and specifically relates to an exhaust gas combustion furnace, including an igniter, a combustion chamber, a base, and a main exhaust pipe. The igniter is connected to one end of the combustion chamber, and the main exhaust pipe is connected to the other end of the combustion chamber. The base is fixed to the bottom of the combustion chamber, and an outer expansion body is mounted on the outside of the base, enclosing the combustion chamber. The outer expansion body has multiple pairs of movable slots, each pair of slots being located on the left and right sides of the combustion chamber and communicating with it. An opening and closing door is movably connected within the movable slot, and a secondary exhaust pipe is inserted into the side of the opening and closing door. The advantages are: this invention can flexibly change the combustion space during instantaneous combustion, thereby achieving rapid pressure relief and expansion, preventing excessive internal pressure of the combustion chamber from causing damage, and improving safety redundancy.

Description

Technical Field

[0001] This invention belongs to the field of exhaust gas treatment technology, and in particular relates to an exhaust gas combustion furnace. Background Technology

[0002] In the exhaust gas treatment section of the waste TBP kerosene pyrolysis incineration system, both domestically and internationally, the main treatment of waste TBP kerosene is pyrolysis incineration technology. Waste TBP kerosene is prepared into a suspension and then fed into a pyrolysis furnace for pyrolysis at 350-450℃. The resulting pyrolysis ash is transported in drums. The generated pyrolysis gas (mainly dodecane, butene, butanol, water, and nitrogen) contains a large amount of combustible substances and requires further treatment. This pyrolysis gas undergoes high-temperature (1000℃) oxygen-permeable combustion to ensure complete combustion, producing carbon dioxide and water. The high-temperature flue gas produced contains small amounts of soot and sulfur dioxide, which, after rapid cooling, washing, and dust removal, meets emission standards and is finally discharged through an exhaust fan. However, because the high-pressure combustion furnace operates at a fixed capacity, in emergency situations, pressure can only be slowly released by interrupting combustion. This causes pressure and damage to the furnace walls, resulting in a mismatch between space utilization and safety.

[0003] Therefore, we propose a tail gas combustion furnace to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a tail gas combustion furnace capable of treating tail gas.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a tail gas combustion furnace, comprising an igniter, a combustion chamber, a base, and a main exhaust pipe, wherein the igniter is connected to one end of the combustion chamber, the main exhaust pipe is connected to the other end of the combustion chamber, the base is fixed to the bottom of the combustion chamber, an outer expansion body is provided on the outside of the base, the outer expansion body is wrapped outside the combustion chamber, the outer expansion body is provided with multiple pairs of movable slots, each pair of movable slots is respectively arranged on the left and right sides of the combustion chamber and is connected to the combustion chamber, an opening and closing door is movably connected in the movable slot, and a secondary exhaust pipe is inserted into the side of the opening and closing door.

[0006] In the aforementioned exhaust gas combustion furnace, the outer expansion body is located at the end of the combustion chamber.

[0007] In the aforementioned exhaust gas combustion furnace, the distance between each pair of movable slots is not less than 50cm.

[0008] In the aforementioned exhaust gas combustion furnace, a drive motor is fixedly connected to the top of the movable slot, a threaded rod is fixedly connected to the shaft of the drive motor, the bottom of the threaded rod is rotatably connected to the movable slot, a pair of movable blocks are threadedly connected to the threaded rod, a connecting rod is rotatably connected to the movable blocks, and the end of the connecting rod is rotatably connected to the side wall of the opening and closing door.

[0009] In the aforementioned exhaust gas combustion furnace, a track is laid at the bottom of the movable slot, and the track extends into the combustion chamber. The opening and closing door is mounted on the track and is slidably connected to the track.

[0010] In the aforementioned exhaust gas combustion furnace, the interior of the opening and closing door is provided with a chamber, and the end face of the opening and closing door is provided with multiple exhaust holes that communicate with the chamber. The auxiliary exhaust pipe is fixedly connected to the outer expansion body, the auxiliary exhaust pipe is slidably connected to the opening and closing door, and the auxiliary exhaust pipe extends into the chamber.

[0011] In the aforementioned exhaust gas combustion furnace, the end face of the opening and closing door is provided with multiple protrusions and slots.

[0012] In the aforementioned exhaust gas combustion furnace, the end face of the opening and closing door is provided with an embedded hole, and a hydraulic rod is fixedly connected inside the embedded hole. The hydraulic rod is located at the middle position of the opening and closing door.

[0013] In the aforementioned exhaust gas combustion furnace, the opening and closing door is made of tantalum carbide hafnium alloy, and its surface is also coated with a graphite layer and a ceramic layer.

[0014] In the aforementioned exhaust gas combustion furnace, the tail ends of multiple auxiliary exhaust pipes converge and connect with the tail end of the main exhaust pipe.

[0015] Compared with existing technologies, the advantages of this exhaust gas combustion furnace are:

[0016] 1. This invention, through the coordination of an outer expansion body, a movable groove, opening and closing doors, a secondary exhaust pipe, and a drive motor, enables multiple opening and closing doors to freely extend and retract within the outer expansion body. This allows for flexible changes in the combustion space during instantaneous combustion, achieving rapid pressure relief and expansion, preventing damage caused by excessive internal pressure in the combustion chamber, and improving safety redundancy.

[0017] 2. This invention achieves the effect of ensuring stability by using the protrusion and slot to tightly clamp the smoke exhaust hole, the slot, the hydraulic rod to actively assist in the opening and closing operation and prevent it from being difficult to open and close due to pressure. At the same time, the smoke exhaust hole and the auxiliary smoke exhaust pipe assist in the smoke exhaust operation of each section of the auxiliary smoke exhaust pipe. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of a tail gas combustion furnace provided by the present invention;

[0019] Figure 2 yes Figure 1 A schematic diagram of the bottom structure;

[0020] Figure 3 yes Figure 1Top perspective view of the central combustion chamber and the outer expansion body;

[0021] Figure 4 yes Figure 1 Another top perspective view of the central combustion chamber and the outer expansion body;

[0022] Figure 5 yes Figure 4 A schematic diagram of the structure of a center-opening door;

[0023] Figure 6 yes Figure 4 Diagram of the movable connection of a center-opening door;

[0024] Figure 7 yes Figure 4 A schematic diagram of the material composition of a center-opening door.

[0025] In the diagram, 1 is the igniter, 2 is the combustion chamber, 3 is the base, 4 is the main exhaust pipe, 5 is the outer expansion body, 6 is the movable groove, 7 is the opening and closing door, 8 is the auxiliary exhaust pipe, 9 is the drive motor, 10 is the threaded rod, 11 is the movable block, 12 is the connecting rod, 13 is the exhaust hole, 14 is the protrusion, 15 is the slot, 16 is the hydraulic rod, 17 is the graphite layer, and 18 is the ceramic layer. Detailed Implementation

[0026] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0027] Example

[0028] In the waste TBP kerosene pyrolysis incineration system's tail gas treatment section, both domestically and internationally, the main treatment of waste TBP kerosene is pyrolysis incineration technology. Waste TBP kerosene is prepared into a suspension and then fed into a pyrolysis furnace for pyrolysis at 350-450℃. The resulting pyrolysis ash is drummed and transported. The generated pyrolysis gas (mainly dodecane, butene, butanol, water, and nitrogen) contains a large amount of combustible substances and requires further treatment. This pyrolysis gas undergoes high-temperature (1000℃) oxygen-permeable combustion to ensure complete combustion, producing carbon dioxide and water. The high-temperature flue gas produced contains small amounts of soot and sulfur dioxide, which, after rapid cooling, washing, and dust removal, meets emission standards and is finally discharged through a tail gas fan. However, high-pressure combustion furnaces operate at a fixed capacity, and in emergencies, pressure can only be slowly released by interrupting combustion. This causes pressure and damage to the furnace walls, resulting in a poor balance between space utilization and safety. Therefore, if... Figure 1-7As shown, this design proposes a flue gas combustion furnace, including an igniter 1, a combustion chamber 2, a base 3, and a main exhaust pipe 4. The main system also includes a quench cooler, a jet scrubbing tower and scrubbing liquid circulation pump, a cooler, a flue gas cooler and an electric heater, a blower, a main exhaust fan and a secondary exhaust fan, etc. (not shown in the figure). The quench cooler adopts a double-layer cylindrical structure, with flanges at both ends connecting to the flue and scrubbing tower pipes. A spray gun is installed at the bottom of the quench cooler, and deionized water is sprayed inside the quench cooler to quench the flue gas. The igniter 1 is a prior art technology and is equipped with a flame adjustment, flame monitoring, wind pressure protection, and a high-pressure automatic ignition device.

[0029] The igniter is heat resistant and suitable for long-term use in high-temperature environments. It has the function of adjusting the flame size and can be successfully ignited under the condition of -13kPa without flameout. The amount of diesel fuel required to maintain the open flame should be as small as possible. The igniter is equipped with a diesel fuel tank, fuel pump and diesel filter, and diesel fuel level monitoring measures.

[0030] Before ignition, an automatic purging process is performed to remove any accumulated combustible gases near the electric ignition point to prevent explosions. The fuel oil section of the igniter is mainly responsible for baking the furnace and maintaining the combustion temperature. Combustion air and 400°C pyrolysis gas enter the combustion furnace from the igniter. An oxygen content analyzer and CO concentration monitor are installed on the flue to ensure complete combustion. The combustion controller of the igniter and the air damper for the combustion air can be remotely controlled, and their opening can be adjusted according to the combustion furnace temperature and oxygen concentration.

[0031] Igniter 1 is connected to one end of combustion chamber 2. Combustion chamber 2 is made of heavy corundum brick as the inner layer to ensure the impact of flame and airflow. The inner layer is made of multi-layer lightweight insulating brick to ensure heat preservation performance. An air insulation layer is set on the outer layer of the metal outer wall. The refractory insulation material is made of high-quality material to ensure that the material has a low linear expansion rate, thereby ensuring the thermal shock resistance of the refractory insulation material. Since the normal wall temperature of the metal surface of the combustion furnace exceeds 60 degrees Celsius, an air insulation layer is set on the outer wall of the combustion furnace to ensure that the surface temperature of the insulation layer of the combustion furnace does not exceed 50 degrees Celsius under full load processing conditions.

[0032] The main exhaust pipe 4 is connected to the other end of the combustion chamber 2 for centralized connection and extraction of the flue gas from the combustion chamber 2 at the end. Unlike the traditional method, the base 3 is fixed to the bottom of the combustion chamber 2 to increase the overall stability. At the same time, an outer expansion body 5 is also installed on the outside of the base 3. The outer expansion body 5 is wrapped around the combustion chamber 2 and is integrated with the combustion chamber 2 to form a clear outer expansion space to accommodate the movement of the opening and closing door 7.

[0033] To ensure the stable movement and operation of the opening and closing door 7, multiple pairs of movable slots 6 are provided on the outer expansion body 5. Each pair of movable slots 6 is respectively set on the left and right sides of the combustion chamber 2. Each pair of movable slots 6 forms an isolated space, thereby allowing for different volumes to be arranged. The distance between each pair of movable slots 6 is not less than 50cm, and they are connected to the combustion chamber 2. Specifically, the opening and closing door 7 is movably connected in the movable slot 6. The opening and closing door 7 and the movable slot 6 are made of sliding seal. In order to improve the pressure resistance and high temperature resistance, the opening and closing door 7 is made of tantalum hafnium carbide alloy, and the surface is also coated with a graphite layer 17 and a ceramic layer 18.

[0034] The driving method of the opening and closing door 7 is as follows: A drive motor 9 is fixedly connected to the top of the movable slot 6, and a threaded rod 10 is fixedly connected to the shaft of the drive motor 9. The drive motor 9 is set at the top to reduce the space occupied at the bottom and to better accommodate the auxiliary exhaust pipe 8. The bottom of the threaded rod 10 is rotatably connected to the movable slot 6, so that the drive motor 9 can drive the threaded rod 10 to rotate cyclically. The drive motor 9 is a servo motor. A pair of movable blocks 11 are threadedly connected to the threaded rod 10. A connecting rod 12 is rotatably connected to the movable blocks 11. The connecting rod 12 is inclined and its end is rotatably connected to the side wall of the opening and closing door 7. After the drive motor 9 drives the threaded rod 10 to rotate, it acts on the movable blocks 11. The two movable blocks 11 move closer or further away from each other, so that the opening and closing door 7 can be pulled forward or moved by the connecting rod 12, thereby controlling the movement of the opening and closing door 7 and controlling the opening or closing of the partial combustion chamber 2.

[0035] To ensure smoother movement of the opening and closing door 7, a track is laid at the bottom of the movable groove 6, extending into the combustion chamber 2. The opening and closing door 7 completely covers the track. At the same time, a recessed hole is provided on the end face of the opening and closing door 7. The recessed hole is located on the opposite end face of the two opening and closing doors 7. A hydraulic rod 16 is fixedly connected in the recessed hole. The hydraulic rod 16 is located in the middle of the opening and closing door 7, which facilitates better pushing of the opening and closing door 7 to assist in the opening and closing operation and prevents it from being difficult to open and close due to pressure.

[0036] To ensure the stability and sealing of the opening and closing door 7 when it is closed, multiple protrusions 14 and slots 15 are provided on the end face of the opening and closing door 7. The protrusions 14 and slots 15 of the same pair of opening and closing doors 7 are staggered and corresponding to each other, so that a pair of opening and closing doors 7 can form a stable connection by relying on the protrusions 14 and slots 15 after closing, thereby improving the sealing and pressure resistance. When the opening and closing door 7 is connected, at least one-quarter of it is left outside the combustion chamber 2, thereby improving the pressure resistance and ensuring the uniformity of force.

[0037] To facilitate the exhaust operations of multiple temporary combustion chambers 2, auxiliary exhaust pipes 8 are inserted into the side of the opening and closing door 7. The opening and closing door 7 has an internal chamber, and its end face has multiple exhaust holes 13 communicating with the chamber. Normal exhaust gas is fed into the chamber through the exhaust holes 13. The auxiliary exhaust pipes 8 are fixedly connected to the outer expansion body 5 and slidably connected to the opening and closing door 7. The auxiliary exhaust pipes 8 extend into the chamber, so the movement of the opening and closing door 7 will not affect the auxiliary exhaust pipes 8, which remain fixed. The tails of the multiple auxiliary exhaust pipes 8 are connected to the main exhaust... The tail end of flue 4 converges and connects to the same system for unified treatment. After the flue gas is absorbed by the exhaust port 13, it is discharged through the chamber and the auxiliary exhaust pipe 8. After the opening and closing door 7 is retracted into the outer expansion body, all the exhaust ports 13 are covered, thereby simultaneously closing the corresponding auxiliary exhaust pipe 8. Two auxiliary exhaust fans are provided, one on and one on standby, to maintain the negative pressure of the system during normal production. The standby fan is used to maintain the negative pressure of the system in standby mode and to start in case the main exhaust fan fails. The exhaust fans ensure that the negative pressure in the facility (~1kPa in the pyrolysis furnace) remains stable. The main and auxiliary fans have an interlock function, which can automatically switch to the auxiliary fan after the main fan is stopped. The flow rate of the exhaust fan ensures a 30% margin when the system is at maximum air volume. This invention can flexibly change the combustion space during instantaneous combustion, thereby achieving the effect of rapid pressure relief and expansion, preventing damage caused by excessive internal pressure in the combustion chamber, and improving safety redundancy.

[0038] Although this document frequently uses terms such as igniter 1, combustion chamber 2, base 3, main exhaust pipe 4, outer expansion body 5, movable groove 6, opening and closing door 7, auxiliary exhaust pipe 8, drive motor 9, threaded rod 10, movable block 11, connecting rod 12, exhaust hole 13, protrusion 14, slot 15, hydraulic rod 16, graphite layer 17, and ceramic layer 18, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A tail gas combustion furnace, characterized in that, The device includes an igniter (1), a combustion chamber (2), a base (3), and a main exhaust pipe (4). The igniter (1) is connected to one end of the combustion chamber (2), and the main exhaust pipe (4) is connected to the other end of the combustion chamber (2). The base (3) is fixed to the bottom of the combustion chamber (2). An expansion body (5) is mounted on the outside of the base (3). The expansion body (5) is wrapped around the combustion chamber (2). The expansion body (5) is provided with multiple pairs of movable slots (6). Each pair of movable slots (6) is respectively located on the left and right sides of the combustion chamber (2) and is connected to the combustion chamber (2). An opening and closing door (7) is movably connected in the movable slot (6). A secondary exhaust pipe (8) is inserted into the side of the opening and closing door (7). A drive motor (9) is fixedly connected to the top of the movable groove (6), and a threaded rod (10) is fixedly connected to the shaft of the drive motor (9). The bottom of the threaded rod (10) is rotatably connected to the movable groove (6). A pair of movable blocks (11) are threadedly connected to the threaded rod (10), and a connecting rod (12) is rotatably connected to the movable blocks (11). The end of the connecting rod (12) is rotatably connected to the side wall of the opening and closing door (7). The opening and closing door (7) has a cavity inside. Multiple smoke exhaust holes (13) communicating with the cavity are provided on the end face of the opening and closing door (7). The auxiliary smoke exhaust pipe (8) is fixedly connected to the outer expansion body (5). The auxiliary smoke exhaust pipe (8) is slidably connected to the opening and closing door (7), and the auxiliary smoke exhaust pipe (8) extends into the cavity.

2. The tail gas combustion furnace according to claim 1, characterized in that, The expansion body (5) is located at the end of the combustion chamber (2).

3. The exhaust gas combustion furnace according to claim 1, characterized in that, The distance between each pair of movable slots (6) shall not be less than 50cm.

4. The exhaust gas combustion furnace according to claim 1, characterized in that, The bottom of the movable slot (6) is covered with a track, which extends into the combustion chamber (2). The opening and closing door (7) is mounted on the track and is slidably connected to the track.

5. The tail gas combustion furnace according to claim 1, characterized in that, The end face of the opening and closing door (7) is provided with multiple protrusions (14) and slots (15).

6. The tail gas combustion furnace according to claim 1, characterized in that, The opening and closing door (7) has a recessed hole on its end face, and a hydraulic rod (16) is fixedly connected in the recessed hole. The hydraulic rod (16) is located at the middle position of the opening and closing door (7).

7. The tail gas combustion furnace according to claim 1, characterized in that, The opening and closing door (7) is made of tantalum hafnium carbide alloy and has a graphite layer (17) and a ceramic layer (18) attached to its surface.

8. The tail gas combustion furnace according to claim 1, characterized in that, The tail ends of the multiple auxiliary exhaust pipes (8) are connected to the tail end of the main exhaust pipe (4).

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