Oxygen-free cracking flue gas treatment device

Abstract

The utility model discloses an anaerobic cracking flue gas treatment device. Belongs to the technical field of anaerobic cracking flue gas treatment, and comprises a cracking gas inlet pipe, and one side of the cracking gas inlet pipe is connected with a mixture removal component for treating flue gas. Liquid drops mingled in the gas can continuously move downwards and forwards due to inertia and gravity, at the moment, if a baffle is arranged at the front end for blocking, the liquid drops can collide with the baffle, the liquid drops are gathered and flow down along the baffle, and finally the liquid drops in the cracked gas are removed; according to the device for removing the liquid drops in the pyrolysis gas, the liquid drops in the mixture in the pyrolysis gas can be conveniently removed, and the situation that the use of the rotary kiln is affected due to the fact that more mixtures are hardened at an outlet of the rotary kiln is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of anaerobic pyrolysis flue gas treatment, and specifically relates to an anaerobic pyrolysis flue gas treatment device. Background Art

[0002] In the process of recycling and reusing waste paint barrels, pretreatment is first carried out, that is, the waste paint barrels are crushed first, and then the crushed waste paint barrel fragments are sent to the hopper of the rotary kiln type oxygen-free cracking furnace through the elevator. The feeding method adopts spiral feeding, and is equipped with water seal and N2 protection to prevent air from entering. Paint and other materials attached to the scrap iron sheet are anaerobic cracked in the cracking furnace at a furnace temperature of 600°C. The cracking gas produced after cracking is transported to the bottom of the secondary combustion chamber through a high-temperature fan. The cracking gas is used as waste gas and is burned in the secondary combustion chamber for re-disposal. The remaining scrap iron sheet in the rotary kiln is discharged by the slag discharger and recycled through subsequent sorting and other means to achieve recycling.

[0003] However, the cracking gas contains a large amount of water vapor and tar and asphalt droplets, which cause coking in the equipment of the subsequent process and affect the normal operation of the equipment. According to the analysis of the composition of the cracking gas, some of the paint in the rotary kiln has been cracked, and the ethylene, propylene, acetone, etc. are all its cracking products, and the other products are speculated to be some organic solvent components of the paint. Some of the uncracked components also evaporate at low temperatures. As the airflow enters the equipment, the temperature begins to decrease and precipitate at the outlet of the rotary kiln, and finally forms a tar and asphalt mixture, which is finally hardened in the equipment. With the increase of use time, the mixture hardened in the equipment gradually increases, which may have a certain impact on the use of the rotary kiln.

[0004] In view of this, this application is hereby filed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an anaerobic cracking flue gas treatment device to achieve the purpose of preventing a large amount of mixture from being condensed at the outlet of the rotary kiln.

[0006] In order to solve the above technical problems, the utility model provides an anaerobic pyrolysis flue gas treatment device, comprising:

[0007] Cracking gas inlet pipe;

[0008] A mixture removal assembly for treating flue gas is connected to one side of the cracked gas inlet pipe, and the mixture removal assembly includes a first-level demisting device connected to one side of the cracked gas inlet pipe, and two first baffles and two second baffles are connected to the first-level demisting device, which are symmetrical to each other. The two first baffles and the two second baffles are alternately arranged, and the first baffle is an integral type, and the upper and lower sides of the first baffle form a gap channel with the device shell, and the second baffle is a split type, and the middle is a gap channel, and the gap channel formed by the two first baffles and the two second baffles is set as a flow channel for flue gas;

[0009] A secondary demisting device is arranged on one side of the primary demisting device, and a wire mesh separator is connected inside the secondary demisting device.

[0010] Furthermore, a first droplet recovery pipe is connected to the bottom of the first-stage demisting device, the other end of the first droplet recovery pipe is connected to a liquid collecting box, the bottom of the liquid collecting box is connected to a discharge pipe, and the shape of the liquid collecting box is trapezoidal.

[0011] Furthermore, a second liquid droplet recovery pipe is connected to the bottom of the secondary demisting device, and the other end of the second liquid droplet recovery pipe is connected to the liquid collecting tank.

[0012] Furthermore, one side of the first-level defogger is connected to a gas delivery pipe, and the other end of the gas delivery pipe is connected to the second-level defogger.

[0013] Furthermore, the secondary demisting device is connected with a separation gas exhaust pipe, and the separation gas exhaust pipe is located below the wire mesh separator.

[0014] Furthermore, the number of the first liquid droplet recovery tubes is two, and the first liquid droplet recovery tubes are located between the first baffle plate and the second baffle plate.

[0015] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art.

[0016] 1. In the utility model, four baffles are arranged in the first-stage demisting device. When the cracked gas enters the large space at a high speed, the flow rate of the cracked gas will suddenly decrease, and the liquid droplets contained in the gas will continue to move downward and forward due to inertia and gravity. At this time, if there is a baffle at the front end to block, the droplets will hit the baffle. As the droplets gather, the droplets flow down along the baffle, and finally the droplets in the cracked gas are removed. After the droplets are removed, they flow into the liquid collecting box arranged at the bottom by gravity. This arrangement is convenient for removing the mixture droplets in the cracked gas, and avoids the situation that more mixtures are condensed at the outlet of the rotary kiln and affect the use of the rotary kiln. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work. In the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the overall structure of an anaerobic pyrolysis flue gas treatment device;

[0019] Figure 2 It is a schematic diagram of the internal structure of an anaerobic pyrolysis flue gas treatment device;

[0020] Figure 3 It is a schematic diagram of the internal structure of a primary demisting device in an anaerobic pyrolysis flue gas treatment device;

[0021] Figure 4 It is a cross-sectional view of a wire mesh separator in an anaerobic pyrolysis flue gas treatment device.

[0022] Numbers in the figure: 1, cracking gas inlet pipe; 2, mixture removal component; 201, primary demisting equipment; 202, first baffle; 203, second baffle; 204, secondary demisting equipment; 205, wire mesh separator; 3, gas delivery pipe; 4, separation gas discharge pipe; 5, liquid collecting box; 6, first droplet recovery pipe; 7, second droplet recovery pipe.

[0023] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figures 1 to 4 As shown, the utility model provides an anaerobic cracking flue gas treatment device.

[0028] Specifically, by Figure 1-4 Given, including:

[0029] Cracking gas inlet pipe 1;

[0030] A mixture removal assembly 2 for treating flue gas is connected to one side of the cracking gas inlet pipe 1. The mixture removal assembly 2 includes a first-level demisting device 201 connected to one side of the cracking gas inlet pipe 1. Two first baffles 202 and two second baffles 203 are connected to the first-level demisting device 201, which are symmetrical to each other. The two first baffles 202 and the two second baffles 203 are alternately arranged. The first baffle 202 is an integral type, and the upper and lower sides of the first baffle 202 form a gap channel with the device shell. The second baffle 203 is a split type, and the middle is a gap channel. The gap channel formed by the two first baffles 202 and the two second baffles 203 is set as a flow channel for flue gas.

[0031] A secondary demisting device 204 is provided on one side of the primary demisting device 201 , and a wire mesh separator 205 is connected inside the secondary demisting device 204 .

[0032] It should be noted that the two first baffles 202 and the two second baffles 203 are both electrically heated baffles, which can prevent the tar and asphalt mixture droplets from adhering to the baffles for a long time. The temperature of the baffles is controlled to keep the droplets in a liquid state and flow into the collecting tank 5 by gravity, and the temperature thereon is controlled by a temperature control table to control the temperature setting. The first and third baffles from left to right are the first baffles 202, which are integral, and the upper and lower sides of the first baffle 202 form a gap channel with the shell of the first-level defogger 201. The second and fourth baffles from left to right are the second baffles 203, which are split.

[0033] In the utility model, four baffles are arranged in the primary defogger 201, namely, two first baffles 202 and two second baffles 203, wherein the first and third baffles from left to right are the first baffles 202 which are integral, and the upper and lower sides of the first baffles 202 form a slit channel with the shell of the primary defogger 201, wherein the second and fourth baffles from left to right are the second baffles 203 which are split, and the middle of the split baffles is a slit channel, and the slit channels of the four baffles are arranged to mainly serve as the flow channel of the smoke;

[0034] The flue gas flow rate increases at the gap position, and the flue gas will suddenly decrease in velocity when it flows through the gap and enters a large space, while the flow rate of droplets in the flue gas will slowly decrease. Therefore, the inertia generated by the different flow rates after the cracking flue gas flows through the first-level demisting equipment 201 plays a role in removing droplets. At the same time, the difference in the gap channels of each baffle further increases the inertia of the flow of flue gas and droplets, and further enhances the effect of removing droplets. The flue gas filtered by the first-level demisting equipment 201 can pass through the second-level demisting equipment 204 again, and rely on the wire mesh separator 205 connected to the second-level demisting equipment 204 to further agglomerate the droplets in the flue gas, thereby playing a secondary removal role.

[0035] Furthermore, as a specific implementation of the present invention, the present invention provides an anaerobic pyrolysis flue gas treatment device.

[0036] Specifically, Figure 1-3 As shown, a first droplet recovery pipe 6 is connected to the bottom of the first-stage demisting device 201, the other end of the first droplet recovery pipe 6 is connected to a liquid collecting tank 5, a discharge pipe is connected to the bottom of the liquid collecting tank 5, and the shape of the liquid collecting tank 5 is trapezoidal.

[0037] In the present invention, the first droplet recovery pipe 6 is provided to facilitate the removal of the mixture droplets to be transported to the liquid collecting box 5 for collection, and the liquid collecting box 5 is designed to be trapezoidal, which facilitates the discharge of the mixture droplets collected in the liquid collecting box 5 through the discharge pipe.

[0038] Furthermore, as another specific implementation of the utility model, the utility model provides an anaerobic pyrolysis flue gas treatment device.

[0039] Specifically, Figure 1-3 As shown, a second liquid droplet recovery pipe 7 is connected to the bottom of the secondary demisting device 204, and the other end of the second liquid droplet recovery pipe 7 is connected to the liquid collecting tank 5.

[0040] In the present invention, this arrangement facilitates the introduction of the droplet mixture filtered by the wire mesh separator 205 into the liquid collection box 5 for collection.

[0041] Furthermore, as another specific implementation of the utility model, the utility model provides an anaerobic pyrolysis flue gas treatment device.

[0042] Specifically, Figure 1-3 As shown, one side of the primary defogger 201 is connected to a gas delivery pipe 3, and the other end of the gas delivery pipe 3 is connected to the secondary defogger 204.

[0043] In the present invention, this arrangement facilitates the transport of the cracking flue gas after the primary filtration to the secondary demisting device 204 for secondary filtration.

[0044] Furthermore, as another specific implementation of the utility model, the utility model provides an anaerobic pyrolysis flue gas treatment device.

[0045] Specifically, Figure 1-3 As shown, the secondary demisting device 204 is connected with a separation gas exhaust pipe 4, and the separation gas exhaust pipe 4 is located below the wire mesh separator 205.

[0046] In the utility model, this arrangement facilitates the discharge of the gas after the mixture is removed.

[0047] Furthermore, as another specific implementation of the utility model, the utility model provides an anaerobic pyrolysis flue gas treatment device.

[0048] Specifically, Figure 1-3 As shown, the number of the first droplet recovery tubes 6 is two, and the first droplet recovery tubes 6 are located between the first baffle 202 and the second baffle 203.

[0049] In the present invention, two first droplet recovery pipes 6 are arranged between the first baffle plate 202 and the second baffle plate 203 to facilitate rapid recovery of the mixture droplets processed by the first baffle plate 202 and the second baffle plate 203 .

[0050] Working principle: four baffles are arranged in the first-stage defogger 201, namely, two first baffles 202 and two second baffles 203, wherein the first and third baffles from left to right are the first baffles 202 which are integral, and the upper and lower sides of the first baffles 202 form a slit channel with the shell of the first-stage defogger 201, wherein the second and fourth baffles from left to right are the second baffles 203 which are split, and the middle of the split baffles is a slit channel, and the slit channels of the four baffles are arranged to mainly serve as the flow channel of the smoke;

[0051] The flue gas flow rate increases at the gap position, and the flue gas will suddenly decrease in velocity when it flows through the gap and enters a large space, while the flow rate of droplets in the flue gas will slowly decrease. Therefore, the inertia generated by the different flow rates after the cracking flue gas flows through the first-level demisting equipment 201 plays a role in removing droplets. At the same time, the difference in the gap channels of each baffle further increases the inertia of the flow of flue gas and droplets, and further enhances the effect of removing droplets. The flue gas filtered by the first-level demisting equipment 201 can pass through the second-level demisting equipment 204 again, and rely on the wire mesh separator 205 connected to the second-level demisting equipment 204 to further agglomerate the droplets in the flue gas, thereby playing a secondary removal role.

[0052] The above is only a preferred embodiment of the present invention, and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.

Claims

1. An anaerobic pyrolysis flue gas treatment device, comprising: Cracking gas inlet pipe (1); The invention is characterized in that a mixture removal assembly (2) for treating flue gas is connected to one side of the cracked gas inlet pipe (1), the mixture removal assembly (2) comprises a first-level demisting device (201) connected to one side of the cracked gas inlet pipe (1), two first baffles (202) and two second baffles (203) are connected in the first-level demisting device (201) and are symmetrical to each other, the two first baffles (202) and the two second baffles (203) are arranged alternately, and gap channels are formed between the upper and lower sides of the first baffle (202) and the device housing, and between the two second baffles (203), and the gap channels are flow channels for flue gas; A secondary demisting device (204) is provided on one side of the primary demisting device (201), and a wire mesh separator (205) is connected inside the secondary demisting device (204).

2. The anaerobic pyrolysis flue gas treatment device according to claim 1, characterized in that: The bottom of the primary demisting device (201) is connected to a first liquid droplet recovery pipe (6), the other end of the first liquid droplet recovery pipe (6) is connected to a liquid collecting box (5), the bottom of the liquid collecting box (5) is connected to a discharge pipe, and the shape of the liquid collecting box (5) is trapezoidal.

3. The anaerobic pyrolysis flue gas treatment device according to claim 1, characterized in that: The bottom of the secondary demisting device (204) is connected to a second liquid droplet recovery pipe (7), and the other end of the second liquid droplet recovery pipe (7) is connected to the liquid collecting tank (5).

4. The anaerobic pyrolysis flue gas treatment device according to claim 1, characterized in that: One side of the primary demisting device (201) is connected to a gas delivery pipe (3), and the other end of the gas delivery pipe (3) is connected to the secondary demisting device (204).

5. The anaerobic pyrolysis flue gas treatment device according to claim 1, characterized in that: The secondary demisting device (204) is connected to a separation gas discharge pipe (4), and the separation gas discharge pipe (4) is located below the wire mesh separator (205).

6. The anaerobic pyrolysis flue gas treatment device according to claim 2, characterized in that: The number of the first liquid droplet recovery tubes (6) is two, and the first liquid droplet recovery tubes (6) are located between the first baffle plate (202) and the second baffle plate (203).

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