Volatile organic compound (VOC) waste gas catalytic pretreatment device

Abstract

The utility model relates to the technical field of waste gas treatment, in particular to a VOC waste gas catalytic pretreatment device which comprises a base, a combustion furnace is fixedly mounted on the top surface of the base, an exhaust pipe is mounted at the top end of the combustion furnace, a combustor is mounted at the bottom of the combustion furnace, and a catalytic bed is mounted at the upper part of the combustion furnace; a preheating cylinder is arranged on the periphery of the combustion furnace, and a spiral partition plate located in the preheating cylinder is fixedly installed on the periphery of the combustion furnace. The periphery of the combustion furnace is provided with an air inlet. The periphery of the preheating cylinder is fixedly connected with an air inlet pipe assembly. Through the arrangement of the preheating cylinder, heat in the combustion furnace can be radiated into the preheating cylinder to preheat waste gas in the preheating cylinder, so that the temperature of the waste gas is increased, and the cost of the treatment process is reduced; and the spiral ventilation cavity is formed between the preheating barrel and the combustion furnace through the spiral partition plate, so that the moving path of the waste gas in the preheating barrel is prolonged, the preheating time of the waste gas in the preheating barrel is prolonged, and the preheating effect of the waste gas is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a VOC waste gas catalytic pretreatment device. Background Art

[0002] VOC waste gas is volatile organic compound waste gas, usually from industrial production processes or automobile exhaust emissions. These organic compounds are harmful to the environment and human health. Pre-treatment of VOC waste gas before emission reduces the impact on the environment and human health; among them, catalytic combustion treatment is a commonly used treatment method, which uses catalysts to cause organic compounds in VOC waste gas to undergo oxidation reactions at lower temperatures and convert them into harmless carbon dioxide and water.

[0003] In the prior art, there is a patent with application number CN202321409312.9 that provides a VOC organic waste gas catalytic combustion treatment device, including a base, a preheating box and a combustion box. The preheating box is fixed on one side of the top of the base, and the combustion box is fixed on the other side of the top of the base. A gas guide mechanism is provided on one side of the preheating box, and a disassembly mechanism is provided on the top of one side of the preheating box. The waste gas is preheated by passing through the preheating box before the combustion treatment, thereby improving the efficiency of the combustion treatment of the device.

[0004] However, the above patent still has the following deficiencies during use:

[0005] According to its content, the preheating box is an individual device independent of the combustion box, and the exhaust gas is preheated by setting a heating rod inside it. This setting increases energy consumption and leads to an increase in the cost of VOC exhaust gas treatment. Utility Model Content

[0006] The purpose of the utility model is to provide a VOC waste gas catalytic pretreatment device to solve the problems raised in the above background technology.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] A VOC waste gas catalytic pretreatment device comprises a base, a combustion furnace is fixedly installed on the top surface of the base, an exhaust pipe which penetrates the combustion furnace is fixedly installed on the top of the combustion furnace, a burner is fixedly installed at the bottom position of the combustion furnace, and a catalytic bed is fixedly installed at the upper position of the combustion furnace; a preheating cylinder coaxial with the combustion furnace is arranged at the periphery of the combustion furnace, the top and bottom ends of the preheating cylinder and the periphery of the combustion furnace are both closed structures, a spiral partition located inside the preheating cylinder is fixedly installed at the periphery of the combustion furnace, the side of the spiral partition is fixedly connected to the inner wall of the preheating cylinder, and the spiral partition forms a spiral ventilation cavity between the inside of the preheating cylinder and the periphery of the combustion furnace;

[0009] An air inlet is provided on the periphery of the combustion furnace, which connects the interior of the combustion furnace with the bottom of the spiral ventilation cavity. An air inlet pipe assembly is fixedly connected to the periphery of the preheating tube near its top, which connects the preheating tube with the upper part of the spiral ventilation cavity. The end of the air inlet pipe assembly away from the preheating tube is fixedly connected to the air outlet of an external air guide device.

[0010] Furthermore, a plurality of heat exchange tubes are fixedly installed through the inner wall of the combustion furnace at a portion overlapping with the preheating tube, and the plurality of heat exchange tubes are distributed in an array along the spiral trajectory of the spiral ventilation cavity.

[0011] Furthermore, the air intake pipe assembly includes a connecting pipe and an air intake pipe, one end of the connecting pipe is fixedly installed with a threaded sleeve, the end of the connecting pipe away from the threaded sleeve is rotatably connected to an air guide pipe, and the end of the air guide pipe away from the connecting pipe is fixedly connected to an air outlet of an external air guide device; one end of the air intake pipe is fixedly connected to the preheating cylinder in a through-type connection, the end of the threaded sleeve away from the connecting pipe is sleeved on the end of the air intake pipe away from the preheating cylinder, and the air intake pipe and the threaded sleeve are threadedly connected, and the connecting pipe is detachably fixedly connected to the air intake pipe via the threaded sleeve.

[0012] Furthermore, the threaded sleeve is provided with a mounting ring located between the connecting pipe and the air inlet pipe, the periphery of the mounting ring is in sliding contact with the inner wall of the threaded sleeve, and a filter is fixedly installed in the mounting ring;

[0013] When the air intake pipe is fixedly connected to the connecting pipe, the mounting ring is squeezed and fixed between the air intake pipe and the connecting pipe.

[0014] Furthermore, a mounting seat coaxial with the connecting pipe is provided in the connecting pipe at a position close to the threaded sleeve, a mounting shaft is rotatably installed in the mounting seat, a fan blade is installed at one end of the mounting shaft away from the air inlet pipe, a mounting plate is fixedly connected to the other end of the mounting shaft, and bristles are provided on the side of the mounting plate close to the air inlet pipe;

[0015] When the air inlet pipe is fixedly connected to the connecting pipe, the end of the bristles close to the air inlet pipe is in extrusion contact with the filter screen;

[0016] A connecting rod is fixedly connected between the periphery of the mounting seat and the inner wall of the connecting pipe.

[0017] Beneficial effects of the utility model:

[0018] In the utility model, by arranging the preheating tube, the heat in the combustion furnace can be radiated into the preheating tube to preheat the waste gas in the preheating tube, thereby increasing the temperature of the waste gas and reducing the external energy required for combustion, which can save energy consumption and reduce the cost of the treatment process; and by arranging the spiral partition plate, a spiral ventilation cavity is formed between the preheating tube and the combustion furnace, so that the movement path of the waste gas in the preheating tube is extended, the preheating time of the waste gas in the preheating tube is increased, and the preheating effect of the waste gas is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a three-dimensional schematic diagram of the internal structure of the preheating cylinder in the utility model;

[0022] Figure 3 It is a schematic diagram of the structure inside the combustion furnace in the utility model;

[0023] Figure 4 It is a structural schematic diagram of the air intake pipe assembly in the utility model;

[0024] The reference numerals are as follows:

[0025] 1-base, 2-burner, 3-combustion furnace, 4-preheating cylinder, 5-air inlet, 6-inlet pipe assembly, 7-catalytic bed, 8-exhaust pipe, 9-spiral partition, 10-spiral ventilation cavity, 11-heat exchange tube, 12-inlet pipe, 13-connecting pipe, 14-air guide pipe, 15-fan blade, 16-mounting seat, 17-connecting rod, 18-threaded sleeve, 19-filter, 20-mounting ring, 21-brush. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Embodiment 1:

[0028] See also Figures 1 to 3 In an embodiment of the utility model, a VOC exhaust gas catalytic pretreatment device comprises a base 1, a combustion furnace 3 is fixedly installed on the top surface of the base 1, an exhaust pipe 8 which penetrates the combustion furnace 3 is fixedly installed on the top of the combustion furnace 3, a burner 2 is fixedly installed at the bottom position of the combustion furnace 3, and a catalytic bed 7 is fixedly installed at the upper position of the combustion furnace 3; a preheating tube 4 which is coaxial with the combustion furnace 3 is arranged at the periphery of the combustion furnace 3, and the top and bottom ends of the preheating tube 4 and the periphery of the combustion furnace 3 are both closed structures, a spiral partition plate 9 located inside the preheating tube 4 is fixedly installed at the periphery of the combustion furnace 3, and the side of the spiral partition plate 9 is fixedly connected to the inner wall of the preheating tube 4, and the spiral partition plate 9 forms a spiral ventilation cavity 10 between the inside of the preheating tube 4 and the periphery of the combustion furnace 3;

[0029] An air inlet 5 is provided on the periphery of the combustion furnace 3, which connects the interior of the combustion furnace 3 with the bottom position of the spiral ventilation cavity 10. An air inlet pipe assembly 6 is fixedly connected to the periphery of the preheating tube 4 near its top, and the air inlet pipe assembly 6 is fixedly connected to the upper position of the spiral ventilation cavity 10. The end of the air inlet pipe assembly 6 away from the preheating tube 4 is fixedly connected to the air outlet of an external air guide device.

[0030] Among them, a plurality of heat exchange tubes 11 are fixedly installed through the inner wall of the combustion furnace 3 in the part overlapping with the preheating tube 4, and the plurality of heat exchange tubes 11 are distributed in an array along the spiral trajectory of the spiral ventilation cavity 10; the arrangement of the heat exchange tubes 11 can improve the heat exchange efficiency, thereby improving the preheating effect of the exhaust gas in the preheating tube 4.

[0031] When the utility model is in use:

[0032] The external air guide device guides the VOC waste gas between the preheating cylinder 4 and the combustion furnace 3 through the air inlet pipe assembly 6, and enters the spiral ventilation cavity 10 at the upper part of the spiral ventilation cavity 10, then moves along the trajectory of the spiral ventilation cavity 10 to the bottom position of the spiral ventilation cavity 10, and then enters the combustion furnace 3 through the air inlet 5. The burner 2 in the combustion furnace 3 burns the VOC waste gas. The burner 2 burns the VOC waste gas under high temperature conditions and oxidizes the volatile organic compounds into carbon dioxide and water vapor; the waste gas treated by the burner enters the catalytic bed 7, which usually contains a catalyst, such as a metal catalyst such as platinum, palladium, etc. Under the action of the catalyst, the residual volatile organic compounds and other harmful substances will continue to be oxidized, so that the pollutants in the waste gas will be further degraded, and finally discharged from the combustion furnace 3 through the exhaust pipe 8;

[0033] By setting the preheating tube 4, the heat in the combustion furnace 3 can be radiated into the preheating tube 4 to preheat the exhaust gas in the preheating tube 4, thereby increasing the temperature of the exhaust gas and reducing the external energy required for combustion, which can save energy consumption and reduce the cost of the treatment process; and by setting the spiral partition plate 9, a spiral ventilation cavity 10 is formed between the preheating tube 4 and the combustion furnace 3, so that the movement path of the exhaust gas in the preheating tube 4 is extended, the preheating time of the exhaust gas in the preheating tube 4 is increased, thereby improving the preheating effect of the exhaust gas.

[0034] Embodiment 2:

[0035] See also Figure 1 and Figure 4 On the basis of Example 1, the intake pipe assembly 6 includes a connecting pipe 13 and an intake pipe 12, one end of the outer periphery of the connecting pipe 13 is fixedly installed with a threaded sleeve 18, and the end of the connecting pipe 13 away from the threaded sleeve 18 is rotatably connected to the air guide pipe 14, and the end of the air guide pipe 14 away from the connecting pipe 13 is fixedly connected to the air outlet of the external air guide device; one end of the intake pipe 12 is fixedly connected to the preheating cylinder 4 in a through-type, and the end of the threaded sleeve 18 away from the connecting pipe 13 is sleeved on the end of the intake pipe 12 away from the preheating cylinder 4, and the intake pipe 12 is threadedly connected to the threaded sleeve 18, and the connecting pipe 13 is detachably fixedly connected to the intake pipe 12 through the threaded sleeve 18.

[0036] The threaded sleeve 18 is provided with a mounting ring 20 located between the connecting pipe 13 and the air inlet pipe 12, the outer periphery of the mounting ring 20 is in sliding contact with the inner wall of the threaded sleeve 18, and the filter screen 19 is fixedly installed in the mounting ring 20;

[0037] When the air intake pipe 12 is fixedly connected to the connecting pipe 13 , the mounting ring 20 is pressed and fixed between the air intake pipe 12 and the connecting pipe 13 .

[0038] Among them, a mounting seat 16 coaxial with the connecting pipe 13 is provided in the connecting pipe 13 at a position close to the threaded sleeve 18, a mounting shaft is rotatably installed in the mounting seat 16, a fan blade 15 is installed at one end of the mounting shaft away from the air inlet pipe 12, and a mounting plate is fixedly connected to the other end of the mounting shaft, and a brush 21 is provided on the side of the mounting plate close to the air inlet pipe 12;

[0039] When the air inlet pipe 12 is fixedly connected to the connecting pipe 13, the end of the bristles 21 close to the air inlet pipe 12 is pressed and contacted with the filter screen 19;

[0040] A connecting rod 17 is fixedly connected between the periphery of the mounting seat 16 and the inner wall of the connecting pipe 13 .

[0041] By setting the filter 19, the exhaust gas entering the preheating cylinder 4 can be preliminarily filtered and effectively captured particulate matter in the VOC exhaust gas, such as dust, granular matter, etc., which is beneficial to improve the effect of subsequent treatment methods (such as catalytic combustion, adsorption, etc.) and reduce treatment costs.

[0042] The connection between the air intake pipe 12 and the connecting pipe 13 through the threaded sleeve 18 makes the air intake pipe assembly 6 a combined structure, which is convenient for disassembly and assembly of the filter screen 19, thereby improving the practicality of the utility model. In addition, impurities will accumulate in the connecting pipe 13 under the long-term filtering effect of the filter screen 19. The combined structure of the air intake pipe assembly 6 facilitates the disassembly of the connecting pipe 13, thereby facilitating the cleaning operation of the impurities in the connecting pipe 13.

[0043] When the exhaust gas passes through the fan blades 15 , the fan blades 15 drive the mounting shaft to rotate, so that the mounting plate drives the bristles to rotate and clean the filter 19 . This arrangement can effectively reduce the degree of blockage of the filter 19 , thereby extending the normal working cycle of the filter 19 .

[0044] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A VOC waste gas catalytic pretreatment device, comprising a base (1), a combustion furnace (3) being fixedly mounted on the top surface of the base (1), an exhaust pipe (8) penetrating the combustion furnace (3) being fixedly mounted on the top of the combustion furnace (3), a burner (2) being fixedly mounted at the bottom of the combustion furnace (3), and a catalytic bed (7) being fixedly mounted at the upper portion of the combustion furnace (3); characterized in that: A preheating cylinder (4) coaxial with the combustion furnace (3) is arranged at the periphery of the combustion furnace (3); the top and bottom ends of the preheating cylinder (4) and the periphery of the combustion furnace (3) are both closed structures; a spiral partition (9) located inside the preheating cylinder (4) is fixedly installed at the periphery of the combustion furnace (3); the side of the spiral partition (9) is fixedly connected to the inner wall of the preheating cylinder (4); the spiral partition (9) forms a spiral ventilation cavity (10) between the interior of the preheating cylinder (4) and the periphery of the combustion furnace (3); An air inlet (5) is provided on the periphery of the combustion furnace (3) and connects the interior of the combustion furnace (3) with the bottom of the spiral ventilation cavity (10). An air inlet pipe assembly (6) is fixedly connected to the periphery of the preheating tube (4) near its top and connects the preheating tube (4) with the upper part of the spiral ventilation cavity (10). The end of the air inlet pipe assembly (6) away from the preheating tube (4) is fixedly connected to the air outlet of an external air guide device.

2. A VOC waste gas catalytic pretreatment device according to claim 1, characterized in that: A plurality of heat exchange tubes (11) are fixedly installed through the inner wall of the combustion furnace (3) at a portion overlapping with the preheating tube (4), and the plurality of heat exchange tubes (11) are distributed in an array along the spiral track of the spiral ventilation cavity (10).

3. A VOC waste gas catalytic pretreatment device according to claim 1, characterized in that: The air intake pipe assembly (6) comprises a connecting pipe (13) and an air intake pipe (12); a threaded sleeve (18) is fixedly mounted on one end of the outer periphery of the connecting pipe (13); an end of the connecting pipe (13) away from the threaded sleeve (18) is rotatably connected to an air guide pipe (14); an end of the air guide pipe (14) away from the connecting pipe (13) is fixedly connected to an air outlet of an external air guide device; one end of the air intake pipe (12) is fixedly connected to the preheating cylinder (4); an end of the threaded sleeve (18) away from the connecting pipe (13) is sleeved on an end of the air intake pipe (12) away from the preheating cylinder (4); the air intake pipe (12) and the threaded sleeve (18) are threadedly connected; the connecting pipe (13) is detachably fixedly connected to the air intake pipe (12) via the threaded sleeve (18).

4. A VOC waste gas catalytic pretreatment device according to claim 3, characterized in that: The threaded sleeve (18) is provided with a mounting ring (20) located between the connecting pipe (13) and the air intake pipe (12), the outer periphery of the mounting ring (20) being in sliding contact with the inner wall of the threaded sleeve (18), and a filter screen (19) being fixedly mounted in the mounting ring (20); When the air intake pipe (12) and the connecting pipe (13) are fixedly connected, the mounting ring (20) is squeezed and fixed between the air intake pipe (12) and the connecting pipe (13).

5. A VOC waste gas catalytic pretreatment device according to claim 4, characterized in that: A mounting seat (16) coaxial with the connecting pipe (13) is provided in the connecting pipe (13) at a position close to the threaded sleeve (18); a mounting shaft is rotatably installed through the mounting seat (16); a fan blade (15) is installed at one end of the mounting shaft away from the air inlet pipe (12); a mounting plate is fixedly connected to the other end of the mounting shaft; bristles (21) are provided on a side of the mounting plate close to the air inlet pipe (12); When the air intake pipe (12) and the connecting pipe (13) are fixedly connected, an end of the bristles (21) close to the air intake pipe (12) is in squeeze contact with the filter screen (19); A connecting rod (17) is fixedly connected between the periphery of the mounting seat (16) and the inner wall of the connecting pipe (13).

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