A synergistic waste gas treatment mechanism and asphalt mixing equipment

Abstract

The utility model discloses a kind of collaborative waste gas treatment mechanism and asphalt mixing plant, it is related to waste gas treatment technical field.Collaborative waste gas treatment mechanism includes multiple first smoke ducts, a centralized box and multiple combustion furnaces, the first smoke duct is connected with the waste gas recovery device of regenerative drum, multiple the first smoke ducts far from the waste gas recovery device one end common connection centralized box, the centralized box is connected with multiple second smoke ducts, multiple the second smoke ducts are connected with multiple the combustion furnace respectively, still include control unit, the first smoke duct is provided with back gas valve, the back gas valve is signal connected with the control unit.Can realize the flexible distribution processing of the centralized collection of multiple regenerative drum waste gas and multiple combustion furnaces, ensure that waste gas can still be effectively purified when any combustion furnace working condition is abnormal.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, specifically to a collaborative waste gas treatment mechanism and an asphalt mixing equipment. Background Technology

[0002] During asphalt pavement construction, the asphalt mixing plant is the core production equipment. Its multiple recycling drums generate a large amount of waste gas containing asphalt fumes during operation. This waste gas contains various pollutants, and direct discharge would cause serious environmental pollution. Therefore, it must undergo purification treatment before it can meet emission standards.

[0003] In existing technologies, the waste gas treatment mode of asphalt mixing plants generally adopts a "one-to-one" design, that is, the waste gas generated by each recycling drum is fixedly led to the corresponding combustion furnace through a dedicated pipeline for incineration and purification. However, this traditional treatment mode has significant drawbacks: on the one hand, when a combustion furnace experiences incomplete combustion due to fuel supply fluctuations, equipment failure and shutdown, or is undergoing regular maintenance, the asphalt-containing flue gas generated by the corresponding recycling drum cannot be effectively incinerated and purified, and can only be directly discharged or temporarily stored, which can easily lead to excessive pollutant emissions and violate environmental protection requirements; on the other hand, the "one-to-one" mode lacks redundant design of the treatment path, and the failure of any treatment unit will directly lead to a decrease in the environmental efficiency of the entire waste gas treatment system or even complete failure, resulting in poor system stability and reliability, and failing to meet the waste gas treatment needs of continuous production processes.

[0004] Therefore, existing technologies need to be improved. Utility Model Content

[0005] To address the shortcomings of existing "one-to-one" waste gas treatment models, such as single path, insufficient redundancy, and easy excessive emissions, the purpose of this utility model is to provide a collaborative waste gas treatment mechanism that can achieve centralized collection of waste gas from multiple regeneration drums and flexible distribution and treatment from multiple combustion furnaces, ensuring that the waste gas can still be effectively purified even when any combustion furnace is in abnormal operation. At the same time, it provides an asphalt mixing plant that includes this treatment mechanism, improving the overall environmental performance and operational stability of the equipment.

[0006] This utility model is achieved through the following technical solution:

[0007] Firstly, this utility model provides a collaborative waste gas treatment mechanism, which includes multiple first flue gas delivery pipes, a centralized housing, and multiple combustion furnaces.

[0008] The first smoke delivery pipe is connected to the waste gas recovery device of the regeneration drum, and the ends of multiple first smoke delivery pipes furthest from the waste gas recovery device are connected to the central housing.

[0009] The central housing is connected to multiple second flue gas supply pipes, which are respectively connected to multiple combustion furnaces.

[0010] It also includes a control unit, and the first smoke supply pipe is equipped with a return air valve, which is signal-connected to the control unit.

[0011] Furthermore, in this utility model, the second smoke supply duct is equipped with an induced draft fan.

[0012] Furthermore, in this utility model, the first flue gas supply duct is equipped with a flue gas concentration sensor, and the flue gas concentration sensor, the control unit, and the induced draft fan are sequentially connected by signals. The control unit adjusts the opening degree of the return gas valve and the power of the induced draft fan according to the detection signal of the flue gas concentration sensor.

[0013] Furthermore, in this utility model, a first sealing flange is provided at the connection between the first smoke supply pipe and the centralized box, and a high-temperature resistant sealing gasket is provided on the mating surface of the first sealing flange.

[0014] Furthermore, in this utility model, a second sealing flange is provided at the connection between the second smoke supply pipe and the centralized box, and a high-temperature resistant sealing gasket is provided on the mating surface of the second sealing flange.

[0015] Furthermore, in this utility model, a dust collection hopper is provided at the bottom of the aforementioned centralized housing, and a dust discharge valve is provided at the lower end of the dust collection hopper. The dust discharge valve is signal-connected to the control unit.

[0016] Furthermore, in this utility model, a pusher is provided on the top of the aforementioned centralized box, a scraper is provided inside the centralized box, and the push rod of the pusher is connected to the scraper.

[0017] Furthermore, in this utility model, the second flue gas supply pipe is provided with a flue gas guide hood, which is conical and extends toward the inner side of the furnace of the combustion furnace.

[0018] Furthermore, in this utility model, the inner walls of the first smoke supply pipe and the second smoke supply pipe are provided with a protective layer.

[0019] Secondly, this utility model provides an asphalt mixing equipment, which includes the aforementioned collaborative waste gas treatment mechanism.

[0020] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0021] This utility model's collaborative waste gas treatment mechanism provides a backup path for waste gas purification. Even if the efficiency of one combustion furnace decreases, the other combustion furnace can automatically switch treatment paths, ensuring the continuity and reliability of pollutant treatment and greatly reducing the risk of exceeding emission standards. For high-concentration or high-flow-rate asphalt fumes, two paths can be opened simultaneously, utilizing two combustion furnaces to incinerate them collaboratively, resulting in treatment capacity and purification thoroughness far exceeding single-furnace treatment. It is adaptable to variable production processes such as "alternating drum self-cleaning." Regardless of which drum processes recycled material, its harmful waste gas can be flexibly introduced into the combustion furnace at its optimal operating state, improving production scheduling flexibility. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the collaborative waste gas treatment mechanism of this utility model;

[0024] Figure 2 This is a schematic diagram of the flue gas guide hood of this utility model;

[0025] Figure 3 This is a schematic diagram of the interior of the centralized housing of this utility model.

[0026] The attached diagram shows the following components and their corresponding names: 1-First flue gas supply duct, 2-Centralized housing, 201-Dust collection hopper, 202-Dust discharge valve, 203-Scraper, 3-Combustion furnace, 4-Waste gas recovery device, 5-Second flue gas supply duct, 501-Flue gas guide hood, 6-Return gas valve, 7-Exhaust fan, 8-Pushing component, 9-Flue gas concentration sensor, 10-First sealing flange, 11-Second sealing flange, 12-High temperature resistant sealing gasket. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only for explaining the present utility model and are not intended to limit the present utility model. The following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the present utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model.

[0028] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Example 1

[0030] This embodiment 1 provides a collaborative waste gas treatment mechanism, combined with Figures 1-3 As shown, this is suitable for asphalt mixing plants equipped with two recycling drums.

[0031] Combination Figure 1 As shown, the regeneration drum is equipped with a waste gas recovery device 4, which is connected to the first flue gas supply pipe 1. Both are made of 304 stainless steel. One end of each first flue gas supply pipe 1 is connected to the waste gas recovery device 4 of the corresponding regeneration drum through a flange. Each first flue gas supply pipe 1 is equipped with a return gas valve 6 and a flue gas concentration sensor 9 in sequence along the direction of waste gas flow.

[0032] It should be noted that the return air valve 6 is an electrically adjustable ball valve, and the flue gas concentration sensor 9 is an infrared asphalt fume concentration detector.

[0033] In this embodiment, combined with Figure 1 and Figure 3 As shown, the collection box 2 is made of tubular metal plate, and an inverted conical dust collection hopper 201 is provided at the bottom of the box. An electric dust discharge valve 202 is installed at the lower outlet of the dust collection hopper 201. The dust discharge valve 202 is an electric butterfly valve.

[0034] Furthermore, in combination Figure 3 As shown, cylinders (i.e., pushers 8) are symmetrically installed on the top of the centralized box 2. The push rod of the cylinder passes through the top of the centralized box 2 and extends into the box. The lower end of the push rod is fixedly connected to the scraper 203. The scraper 203 is a steel plate adapted to the inner wall of the centralized box 2. Its size matches the cross-section of the inner cavity of the box. Rubber scraper strips are installed on the edge of the scraper 203. The rubber scraper strips are tightly attached to the inner wall of the box.

[0035] Combination Figure 1 and Figure 3As shown, two air inlets are provided on the left side of the housing, which are respectively connected to the ends of the two first smoke supply pipes 1 away from the waste gas recovery device 4. Two air inlets are provided on the right side of the housing for connecting the second smoke supply pipe 5. The central housing 2 and the first smoke supply pipe 1 are connected by a first sealing flange 10, and high-temperature resistant sealing gaskets 12 are provided on the mating surfaces of the first sealing flanges 10.

[0036] Combination Figure 1 As shown, in this embodiment, two second flue gas ducts 5 are provided, both made of 304 stainless steel. One end of each second flue gas duct 5 is connected to the outlet of the central housing 2, and the other end is connected to the inlet of the combustion furnace 3. The central housing 2 and the second flue gas ducts 5 are connected by a second sealing flange 11, and high-temperature resistant sealing gaskets 12 are provided on the mating surfaces of the second sealing flanges 11. The high-temperature resistant sealing gaskets 12 can be made of ceramic fiber.

[0037] Furthermore, in this embodiment, each second smoke supply duct 5 is equipped with an induced draft fan 7, which is a centrifugal induced draft fan 7, and as shown... Figure 2 As shown, a conical flue gas hood 501 is installed at one end near the combustion furnace 3. The flue gas hood 501 can be fixed by a bracket. The diameter of the larger end of the flue gas hood 501 is the same as the inner diameter of the second flue gas supply pipe 5, which facilitates docking with the second flue gas supply pipe 5. The flue gas hood 501 extends 200mm into the furnace chamber of the combustion furnace 3.

[0038] Combustion furnace 3 consists of two units, both oil-fired hot air furnaces, with furnace temperatures reaching 800-1000℃, capable of fully incinerating and purifying pollutants in asphalt fumes; combined with Figure 2 Figure 2 As shown, the air inlet of the combustion furnace 3 is correspondingly set with the flue gas guide hood of the second flue gas duct 5 to ensure that the exhaust gas can directly enter the high-temperature area of ​​the furnace.

[0039] In this embodiment, the control unit adopts a PLC controller, which integrates an analog input module, a digital input module, and a digital output module. The control unit is connected to the return gas valve 6, the flue gas concentration sensor 9, the induced draft fan 7, the dust discharge valve 202, and the cylinder through signal lines to realize signal acquisition and command output.

[0040] The inner walls of both the first smoke supply pipe 1 and the second smoke supply pipe 5 are coated with a 4mm thick high-temperature and corrosion-resistant ceramic coating, which has good wear resistance and corrosion resistance and can effectively extend the service life of the pipes.

[0041] The working principle of this embodiment is as follows:

[0042] The asphalt-containing fumes generated during the operation of the two recycling drums in the asphalt mixing plant enter the corresponding first fumes delivery pipe 1 through their respective fumes recovery devices 4. At this time, the control unit, according to a preset program or operator instructions, controls the initial opening of the return gas valve 6 on each first fumes delivery pipe 1 to 50%, allowing the fumes to enter the centralized housing 2. The fumes concentration sensor 9 on each first fumes delivery pipe 1 detects the fumes concentration in the pipe in real time and transmits the detected analog signals to the control unit; the control unit analyzes and processes the four concentration signals.

[0043] When the exhaust gas concentration in a certain pipeline is at a low concentration threshold, the control unit controls the return gas valve 6 of that pipeline to reduce its opening to 30%, and at the same time reduces the power of the induced draft fan 7 of the corresponding combustion furnace 3 to 60% of its rated power, thereby reducing the exhaust gas delivery volume and preventing energy waste caused by excessively low load on the combustion furnace 3. When the exhaust gas concentration is within the normal concentration range, the return gas valve 6 remains at 50% opening, and the induced draft fan 7 operates at its rated power to ensure stable exhaust gas treatment. When the exhaust gas concentration is at a high concentration threshold, the control unit controls the return gas valve 6 of that pipeline to increase its opening to 80%, and at the same time increases the power of the induced draft fan 7 to 90% of its rated power, thereby accelerating the exhaust gas delivery speed and preventing high-concentration exhaust gas from accumulating in the pipeline.

[0044] The exhaust gases transported by each of the first smoke delivery pipes 1 converge in the central collection box 2. During the flow of the exhaust gases within the box, solid particles (such as asphalt particles, dust, etc.) contained therein settle to the dust collection hopper 201 at the bottom under the influence of gravity. When work stops, the control unit controls the dust discharge valve 202 to open, discharging the collected dust to the designated collection container below. The control unit also controls the top cylinder to drive the scraper 203 to move up and down reciprocally (3-5 times), scraping the dust adhering to the inner wall of the box. The dust automatically falls into the dust collection hopper 201 below.

[0045] The exhaust gas in the centralized box 2 is transported to the corresponding combustion furnace 3 through four second flue gas pipes 5. The conical flue gas guide hood 501 guides the exhaust gas to flow along the center of the furnace, so that the exhaust gas can fully contact the high-temperature flame in the combustion furnace 3. The pollutants such as asphalt fumes in the exhaust gas are completely burned and decomposed to generate harmless carbon dioxide and water. The purified gas is discharged through the chimney of the combustion furnace 3 in compliance with standards.

[0046] Example 2

[0047] This embodiment provides an asphalt mixing plant, including the synergistic waste gas treatment mechanism described in Embodiment 1.

[0048] During operation, the waste gas generated by the recycled drum heating and mixing the asphalt mixture is initially removed by the waste gas recovery device 4 and then enters the collaborative waste gas treatment mechanism for centralized collection, dynamic distribution and high-temperature incineration purification, ensuring that there is no excessive waste gas emission throughout the process; even if a certain combustion furnace 3 malfunctions or is under maintenance, the waste gas treatment system can still operate normally, which greatly improves the environmental stability and continuous operation capability of the equipment.

[0049] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A collaborative waste gas treatment mechanism, characterized in that, It includes multiple first flue gas ducts (1), a central box (2), and multiple combustion furnaces (3). The first smoke supply pipe (1) is connected to the waste gas recovery device (4) of the regeneration drum, and the ends of multiple first smoke supply pipes (1) away from the waste gas recovery device (4) are connected to the central box (2). The central housing (2) is connected to multiple second flue gas pipes (5), which are respectively connected to multiple combustion furnaces (3). It also includes a control unit, and the first smoke supply pipe (1) is provided with a return air valve (6), which is signal connected to the control unit.

2. The collaborative waste gas treatment mechanism according to claim 1, characterized in that, The second smoke supply duct (5) is equipped with an induced draft fan (7).

3. The collaborative waste gas treatment mechanism according to claim 2, characterized in that, The first flue gas duct (1) is equipped with a flue gas concentration sensor (9). The flue gas concentration sensor (9), the control unit, and the induced draft fan (7) are connected in sequence. The control unit adjusts the opening of the return gas valve (6) and the power of the induced draft fan (7) according to the detection signal of the flue gas concentration sensor (9).

4. The collaborative waste gas treatment mechanism according to claim 1, characterized in that, A first sealing flange (10) is provided at the connection between the first smoke supply pipe (1) and the central box (2), and a high-temperature resistant sealing gasket (12) is provided on the mating surface of the first sealing flange (10).

5. The collaborative waste gas treatment mechanism according to claim 4, characterized in that, A second sealing flange (11) is provided at the connection between the second smoke supply pipe (5) and the central box (2), and a high-temperature resistant sealing gasket (12) is provided on the mating surface of the second sealing flange (11).

6. The collaborative waste gas treatment mechanism according to claim 1, characterized in that, The bottom of the central box (2) is provided with a dust collection hopper (201), and the lower end of the dust collection hopper (201) is provided with a dust discharge valve (202), which is signal connected to the control unit.

7. The collaborative waste gas treatment mechanism according to claim 6, characterized in that, The top of the central box (2) is provided with a pusher (8), and the inside of the central box (2) is provided with a scraper (203). The push rod of the pusher (8) is connected to the scraper (203).

8. The collaborative waste gas treatment mechanism according to claim 1, characterized in that, The second flue gas duct (5) is provided with a flue gas guide hood (501), which is conical and extends toward the inside of the furnace of the combustion furnace (3).

9. The collaborative waste gas treatment mechanism according to claim 1, characterized in that, The inner walls of the first smoke supply pipe (1) and the second smoke supply pipe (5) are provided with protective layers.

10. An asphalt mixing plant, characterized in that, Including the collaborative waste gas treatment mechanism as described in any one of claims 1-9.

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