Tail gas treatment device of asphalt plant mixing hot regeneration combined equipment and combined equipment

Abstract

The utility model relates to the field of asphalt hot mix plant regeneration, in particular to a tail gas treatment device of asphalt hot mix plant regeneration combined equipment and the combined equipment, the tail gas treatment device is used for treating tail gas of the combined equipment, and the combined equipment comprises a primary drying roller, a regeneration drying roller, a primary bag-type dust collector and a regeneration bag-type dust collector. An air inlet of the primary bag-type dust remover is connected with an air outlet of the primary drying roller to form a primary dust removal pipeline, and an air inlet of the regeneration bag-type dust remover is connected with an air outlet of the regeneration drying roller to form a regeneration dust removal pipeline. According to the utility model, the primary bag-type dust collector and the regeneration bag-type dust collector are respectively connected with the primary drying roller and the regeneration drying roller, so that the problem of high operation difficulty caused by mutual interference when different devices treat tail gas in the same bag is solved.

Description

Technical Field

[0001] The utility model relates to the field of hot regeneration of asphalt mixing plant, in particular to an exhaust gas treatment device and combined equipment of hot regeneration combined equipment of asphalt mixing plant. Background Art

[0002] The existing asphalt mixture plant hot regeneration combined equipment refers to a set of plant hot regeneration equipment combined with the original asphalt mixture equipment, so that the original equipment has the function of adding old asphalt mixture materials. As for the exhaust gas treatment of the asphalt mixture plant hot regeneration combined equipment, usually the original equipment and the regeneration equipment share a bag dust collector for treatment.

[0003] Factory-mixed hot recycling equipment is divided into two types according to the structural method of heating old asphalt mixture materials: downstream heating and countercurrent heating. The regenerated exhaust gas generated in the downstream heating regeneration equipment is generally first introduced into the original drying drum in the original equipment for secondary combustion treatment, and then passes through the original drying drum and the exhaust gas generated after the original material is dried and heated. Enter the bag dust collector for filtration treatment. However, this structure is only suitable for relatively low-yield recycled materials. Because when a higher yield of recycled materials is to be achieved, the regeneration equipment will generate a large amount of regenerated exhaust gas, and when the regenerated exhaust gas enters the original drying drum, it will greatly increase the wind speed in the original drum, seriously affecting the thermal efficiency of the original drying drum and reducing production capacity.

[0004] The regenerated flue gas generated in the countercurrent heating regeneration equipment is introduced into the bag dust collector for filtration and treatment at the same time as the original exhaust gas, but this method still has the following problems: 1. The original exhaust gas and the regenerated exhaust gas are treated by a bag dust collector, which greatly increases the difficulty of operation. It is necessary to adjust the damper opening of the original inlet bag dust collector and the damper opening of the regeneration inlet bag dust collector according to the changes in the original regeneration production volume from time to time to avoid mutual interference caused by different exhaust gas volumes and temperatures during the production process, so as to meet the negative pressure state of the two equipments for normal use at the same time, increasing the operation risk of operators during the operation process; 2. In this method, the dust in the regenerated exhaust gas can be filtered and treated by the bag dust collector, while the asphalt fume in the regenerated exhaust gas cannot be completely cleaned by the bag dust collector. Some asphalt fume is still discharged from the equipment through the filter cloth. In order to further treat the remaining asphalt fume, the gas filtered by the bag must be sent to the incineration device to incinerate the asphalt fume. In the prior art, when the original exhaust gas and the re-exhaust gas enter the bag filter at the same time and mix, it is necessary to incinerate this part of the mixed gas at the same time, which will greatly increase the incineration treatment amount. Not only greatly increases the energy consumption, but also because the concentration of the asphalt flue gas has been diluted after mixing, thereby reducing the efficiency of the incineration treatment. Utility Model Content

[0005] The main purpose of the utility model is to overcome the shortcomings of the prior art and provide an exhaust gas treatment device and combined equipment for asphalt plant hot regeneration combined equipment, which are connected to the original drying drum and the regenerated drying drum respectively by arranging a primary bag dust collector and a regenerated bag dust collector, which not only solves the problem of interference between different equipment in the same bag exhaust gas treatment and difficulty in operation, but also avoids the mixing of regenerated exhaust gas with primary exhaust gas, which leads to increased processing volume, increased energy consumption and reduced incineration efficiency in the subsequent asphalt flue gas incineration treatment.

[0006] The utility model adopts the following technical solutions:

[0007] A tail gas treatment device for an asphalt plant hot-mix regeneration combined equipment is used to treat the tail gas of the combined equipment. The combined equipment includes a primary drying drum and a regenerated drying drum, and includes a primary bag dust collector, a regenerated bag dust collector and an incineration mechanism. The air inlet of the primary bag dust collector is connected to the air outlet of the primary drying drum to form a primary dust collection pipeline. The air inlet of the regenerated bag dust collector is connected to the air outlet of the regenerated drying drum to form a regenerated dust collection pipeline. A first branch with adjustable air intake is formed on the primary dust collection pipeline. The air inlet end of the first branch is connected to the dust collection pipeline, and the air outlet end is connected to the air inlet of the regenerated bag dust collector. The air outlet of the regenerated bag dust collector is connected to the air inlet end of the incineration mechanism. A second branch is formed at the air outlet of the regenerated bag dust collector. The air inlet end of the second branch is connected to the air outlet of the regenerated bag dust collector, and the air outlet end is connected to the air outlet of the primary bag dust collector. The second branch can be switched between a closed state and a connected state.

[0008] Furthermore, it also includes an adjusting damper, which is arranged on the first branch and is used to adjust the air intake volume of the first branch.

[0009] Furthermore, the regenerated bag filter is connected to the incineration mechanism via an exhaust pipe, the air inlet end of the second branch is connected to the exhaust pipe, and the air outlet of the original bag filter is connected to the atmosphere.

[0010] Furthermore, a switching valve is provided at the connection point between the second branch and the exhaust pipe, and the switching valve can control the second branch to switch between a connected state and a closed state.

[0011] Furthermore, it also includes a powder spraying system, which is arranged on the regeneration dust removal pipeline.

[0012] Furthermore, a return air fan is also included, wherein the air inlet of the return air fan is connected to the exhaust pipe, and the air outlet is connected to the air inlet of the regeneration drying drum.

[0013] An asphalt plant-mix hot regeneration combined equipment includes a first burner, a primary drying drum, a second burner, a hot air furnace, a regeneration drying drum and an exhaust gas treatment device as described above, wherein the first burner is connected to the primary drying drum, the second burner is connected to the hot air furnace, the hot air furnace is connected to the regeneration drying drum, the primary drying drum is connected to the primary bag dust collector, and the regeneration drying drum is connected to the regeneration bag dust collector.

[0014] From the above description of the utility model, it can be seen that compared with the prior art, the beneficial effects of the utility model are:

[0015] First, by setting up a primary bag dust collector and a regenerated bag dust collector, two small bag dust collectors are used to replace the structure of a single large bag dust collector, so that the exhaust gas from the primary drying drum is treated by the primary bag dust collector, and the exhaust gas from the regenerated drying drum is treated by the regenerated bag dust collector. The two exhaust gases are treated separately, which solves the problem of interference between different equipment in the same bag exhaust treatment and difficulty in operation.

[0016] Second, the air intake volume of the first branch is adjusted by adjusting the damper. The first branch connects the original dust removal pipeline and the regeneration dust removal pipeline. According to the actual production volume, when the processing volume of the original bag dust collector is insufficient, the damper opening can be adjusted to allow the regeneration bag dust collector to assist in processing the original exhaust gas. The two bag dust collectors can process the original exhaust gas at the same time to meet the larger original production volume, make full use of the equipment and avoid idle excess production capacity.

[0017] Third, by setting a switching valve and a second branch, the switching valve can control the second branch to switch between a connected state and a closed state, so that two bag filters can be discharged through the same chimney, or the exhaust gas can be discharged independently. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The solid arrows in the figure indicate the flow direction of the tail gas, and the hollow arrows indicate the flow direction of the material.

[0019] In the figure: 1. first burner, 2. original drying drum, 3. second burner, 4. hot air furnace, 5. regeneration drying drum, 6. original bag dust collector, 7. regeneration bag dust collector, 8. incineration mechanism, 9. regulating damper, 10. exhaust pipe, 11. switching valve, 12. powder spraying system, 13. return air fan, 14. original dust removal pipeline, 15. regeneration dust removal pipeline, 16. first branch, 17. second branch. DETAILED DESCRIPTION

[0020] The present invention is further described below through specific implementation methods.

[0021] Reference Figure 1 The utility model discloses an exhaust gas treatment device and a combined device of an asphalt plant mixing hot regeneration combined device, wherein the asphalt plant mixing hot regeneration combined device comprises a first burner 1, a primary drying drum 2, a second burner 3, a hot air furnace 4, a regeneration drying drum 5 and an exhaust gas treatment device, wherein the first burner 1 is connected to the primary drying drum 2, the second burner 3 is connected to the hot air furnace 4, the hot air furnace 4 is connected to the regeneration drying drum 5, the exhaust gas treatment device is connected to the primary drying drum 2 and the regeneration drying drum 5, and the exhaust gas treatment device is used to treat the exhaust gas of the combined device.

[0022] The exhaust gas treatment device includes a primary bag dust collector 6, a regenerated bag dust collector 7, an incineration mechanism 8, an adjusting damper 9, an exhaust pipe 10, a switching valve 11, a powder spraying system 12 and a return air fan 13. The air inlet of the primary bag dust collector 6 is connected to the air outlet of the primary drying drum 2 to form a primary dust removal pipeline 14. The air inlet of the regenerated bag dust collector 7 is connected to the air outlet of the regenerated drying drum 5 to form a regenerated dust removal pipeline 15. The primary dust removal pipeline 14 is formed with a first A branch 16, the air inlet end of the first branch 16 is connected to the original dust removal pipeline 14, and the air outlet end is connected to the air inlet of the regenerated bag filter 7, the air outlet of the regenerated bag filter 7 is connected to the air inlet end of the incineration mechanism 8 through the exhaust pipe 10, and the air outlet of the regenerated bag filter 7 forms a second branch 17, the air inlet end of the second branch 17 is connected to the air outlet of the regenerated bag filter 7, and the air outlet end is connected to the air outlet of the original bag filter 6. The regulating damper 9 is arranged on the first branch 16, and the regulating damper 9 is used to adjust the air intake of the first branch 16, and the air outlet of the original bag filter 7 is connected to the atmosphere. A switching valve 11 is provided at the connection point between the second branch 17 and the exhaust pipe 10. The switching valve 11 can control the second branch 17 to switch between a connected state and a closed state. When the second branch 17 is in a connected state, the exhaust pipe 10 is in a closed state, and when the second branch 17 is in a closed state, the exhaust pipe 10 is in a connected state. The powder spraying system 12 is provided on the regeneration dust removal pipeline 15. The air inlet of the return air fan 13 is connected to the exhaust pipe 10, and the air outlet is connected to the air inlet of the hot air furnace 4.

[0023] Continue to refer to Figure 1When the utility model is used, the regeneration heating method in the utility model is based on the countercurrent heating structure. The exhaust gas generated by the original drying drum 2 flows from the original dust removal pipeline 14 to the original bag dust collector 6, and is directly discharged after being treated by the original bag dust collector 6. The exhaust gas generated by the regenerated drying drum 5 flows from the regeneration dust removal pipeline 15 to the regeneration bag dust collector 7, and then flows to the incineration mechanism 8 through the exhaust pipe 10, and is discharged after being incinerated by the incineration mechanism 8. When the original drying drum 2 and the regenerated drying drum 5 are in production at the same time, the regulating damper 9 is closed. At this time, the original exhaust gas is only filtered and processed by the original bag dust collector 6. When the regenerated drying drum 5 is not in production and only the original drying drum 2 is in production, the regulating damper 9 is adjusted according to the actual production volume. When the processing volume of the original bag dust collector 6 is insufficient, the opening of the regulating damper 9 is adjusted, and the regenerated bag dust collector 7 is allowed to assist in processing the exhaust gas through the first branch 16, so that the two bag dust collectors can process the original exhaust gas at the same time to meet the larger original production volume, make full use of the equipment, and avoid idle excess production capacity.

[0024] A powder spraying system 12 is arranged at the position where the regeneration drying drum 5 is connected with the regeneration bag dust collector 7, which is used to spray an appropriate amount of mineral powder or recycled powder into the regeneration dust removal pipeline 15, firstly to carry out powder-wrapped smoke treatment with the regeneration flue gas, and then enter the regeneration bag dust collector 7. The tail gas filtered by the regeneration bag dust collector 7 enters the incineration mechanism 8 to incinerate the residual asphalt flue gas in the tail gas and then discharge it. Among them, a return air fan 13 is arranged at the connection between the regeneration bag dust collector 7 and the incineration mechanism 8, and a part of the regeneration tail gas is extracted by the return air fan 13 and sent to the hot air furnace 4 for secondary combustion. In addition, the switching valve 11 can be adjusted as needed, so that the original bag dust collector 6 and the regeneration bag dust collector 7 can be discharged through the same chimney, or the tail gas can be discharged independently.

[0025] The above is only a specific implementation of the present utility model, but the design concept of the present utility model is not limited to this. Any non-substantial changes to the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. An exhaust gas treatment device for an asphalt plant hot regeneration combined equipment, used to treat the exhaust gas of the combined equipment, the combined equipment comprising a primary drying drum and a regeneration drying drum, characterized in that: It includes a native bag dust collector, a regenerated bag dust collector and an incineration mechanism, the air inlet of the native bag dust collector is connected to the air outlet of the native drying drum to form a native dust collection pipeline, the air inlet of the regenerated bag dust collector is connected to the air outlet of the regenerated drying drum to form a regenerated dust collection pipeline, a first branch with adjustable air intake volume is formed on the native dust collection pipeline, the air inlet end of the first branch is connected to the dust collection pipeline, and the air outlet end is connected to the air inlet of the regenerated bag dust collector, the air outlet of the regenerated bag dust collector is connected to the air inlet end of the incineration mechanism, the air outlet of the regenerated bag dust collector forms a second branch, the air inlet end of the second branch is connected to the air outlet of the regenerated bag dust collector, and the air outlet end is connected to the air outlet of the native bag dust collector, and the second branch can be switched between a closed state and a connected state.

2. The tail gas treatment device of the asphalt plant hot regeneration combined equipment according to claim 1 is characterized by: It also includes an adjusting damper, which is arranged on the first branch and is used to adjust the air intake volume of the first branch.

3. The tail gas treatment device of the asphalt plant hot regeneration combined equipment according to claim 1 is characterized by: The regenerated bag filter is connected to the incineration mechanism via an exhaust pipe, the air inlet end of the second branch is connected to the exhaust pipe, and the air outlet of the original bag filter is connected to the atmosphere.

4. The tail gas treatment device of the asphalt plant hot regeneration combined equipment according to claim 3 is characterized by: A switching valve is provided at the connection point between the second branch and the exhaust pipe, and the switching valve can control the second branch to switch between a connected state and a closed state.

5. The tail gas treatment device of the asphalt plant hot regeneration combined equipment according to claim 1 is characterized by: It also includes a powder spraying system, which is arranged on the regeneration dust removal pipeline.

6. The tail gas treatment device of the asphalt plant hot regeneration combined equipment according to claim 3 is characterized by: It also includes a return air fan, the air inlet of the return air fan is connected to the exhaust pipe, and the air outlet is connected to the air inlet of the regeneration drying drum.

7. An asphalt plant hot regeneration combined equipment, characterized in that: It includes a first burner, a primary drying drum, a second burner, a hot air furnace, a regenerative drying drum and an exhaust gas treatment device as described in any one of claims 1 to 6, wherein the first burner is connected to the primary drying drum, the second burner is connected to the hot air furnace, the hot air furnace is connected to the regenerative drying drum, the primary drying drum is connected to the primary bag dust collector, and the regenerative drying drum is connected to the regenerative bag dust collector.

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