Asphalt smoke waste gas treatment system

Abstract

The utility model belongs to the technical field of environmental protection equipment, and relates to an asphalt fume waste gas treatment system. The treatment system comprises a circulating dust removal reaction device for filtering asphalt smoke and particulate pollutants and a heat storage combustion device for combusting gaseous pollutants, the circulating dust removal reaction device comprises a venturi reactor, the output end of the venturi reactor is connected to the input end of an ascending pipeline reactor, the output end of the ascending pipeline reactor is connected to the input end of a filter, and the output end of the filter is connected to a heat storage combustion device; the heat storage combustion device comprises a combustion chamber and a plurality of heat storage chambers, and gaseous pollutants enter the combustion chamber to be combusted after being preheated through the heat storage chambers. According to the system, a dry-process circulating dust removal and heat storage combustion process is adopted, so that the problem of sewage generated by conventional wet-process asphalt fume treatment is effectively solved, and the asphalt fume can be effectively removed.

Description

Technical Field

[0001] This utility model belongs to the field of environmental protection equipment technology and relates to an asphalt fume exhaust gas treatment system. Background Technology

[0002] Currently, most asphalt fume treatment devices on the market generally adopt the following treatment mode: first, a spray tower is used to perform preliminary filtration of the asphalt fumes; then, electrostatic precipitator is used to enhance the separation of harmful substances; and finally, activated carbon adsorption is used to purify the asphalt fumes. However, this type of treatment device has obvious drawbacks. When using a water spray structure, the water is only used as a one-time treatment medium, resulting in extremely serious water waste, and the sprayed water cannot be effectively reused. Moreover, the asphalt fumes after water spraying need to be transported through pipelines before entering the electrostatic precipitator. Over time, a large amount of asphalt fume impurities will adhere to the inner wall of the pipeline, leading to secondary pollution problems caused by the asphalt fumes. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and propose an asphalt fume exhaust gas treatment system.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An asphalt fume exhaust gas treatment system includes a circulating dust removal reaction device for filtering out asphalt fumes and particulate pollutants and a regenerative combustion device for burning gaseous pollutants.

[0006] The circulating dust removal reactor includes a Venturi reactor, the output end of which is connected to the input end of an ascending pipe reactor, the output end of which is connected to the input end of a filter, and the output end of which is connected to a regenerative combustion device.

[0007] The regenerative combustion device includes a combustion chamber and several regenerative chambers. Gaseous pollutants are preheated in the regenerative chambers and then enter the combustion chamber for incineration.

[0008] Furthermore, the filter includes a primary filter and a post-filter, with the post-filter located after the primary filter.

[0009] Furthermore, an emergency switch valve is provided between the filter and the regenerative combustion device.

[0010] Furthermore, the filter is provided with a waste outlet and a return material adjustment port.

[0011] Furthermore, each of the heat storage chambers is equipped with several switching valves at its inlet.

[0012] Furthermore, the combustion chamber is connected to a natural gas pipeline, and a control module is installed on the natural gas pipeline.

[0013] Furthermore, a centrifugal fan is installed at the rear end of the regenerative combustion device to discharge the treated waste gas.

[0014] Furthermore, a temperature detection device is installed on the outside of the heat storage chamber and the combustion chamber.

[0015] Furthermore, the heat storage chamber is connected to an exhaust fan, and the combustion chamber is connected to an air fan.

[0016] Furthermore, the combustion chamber is equipped with a supplemental cooling device.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This invention provides an asphalt fume exhaust gas treatment system. The asphalt fume exhaust gas enters a circulating dust removal reaction device, where it reacts with the asphalt fume in the Venturi reactor and the rising pipe reactor through granular filter media, forming large particles containing asphalt fume. The asphalt fume and particulate pollutants in the exhaust gas are then removed by a filter. Depending on the reusability of the returned material, the filtered granular material is discharged as waste or reused through electrically operated on / off valves and electrically adjustable valves at the waste outlet and return material regulating port. In summary, the circulating dust removal reaction device primarily reacts with the asphalt fume to form large particles containing asphalt fume, and then removes the asphalt fume and particulate pollutants from the exhaust gas through filtration.

[0019] 2. The asphalt fume exhaust gas treatment system includes a circulating dust removal and reaction device. The exhaust gas from the front-end dust removal enters the rear-end regenerative combustion device to burn the organic components in the exhaust gas. The temperature of the combustor is 1000℃. The exhaust gas after combustion is extracted under negative pressure by a centrifugal fan and then discharged by the centrifugal fan, which will not cause secondary pollution of asphalt fumes.

[0020] In summary, the dry circulating dust removal + regenerative combustion process effectively solves the wastewater problem generated by conventional wet asphalt fume treatment, effectively removes asphalt fumes, and does not cause secondary pollution from asphalt fumes. Attached Figure Description

[0021] The accompanying drawings are incorporated in and form part of this specification, and together with the description, serve to explain the principles of this invention.

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the asphalt fume waste treatment system of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of part A (circulating dust removal reaction device) of the asphalt fume waste treatment system of this utility model;

[0025] Figure 3 This is a schematic diagram of part B (regenerative combustion device) of the asphalt fume waste treatment system of this utility model.

[0026] Wherein: 1 is a circulating dust removal reactor; 11 is a Venturi reactor; 12 is an ascending pipe reactor; 13 is a filter; 131 is a waste outlet; 132 is a return material regulating port; 2 is a regenerative combustion device; 21 is a combustion chamber; 22 is a regenerative chamber; 221 is a switching valve; 23 is an emergency switch valve; 24 is a control module; 25 is a temperature detection device. Detailed Implementation

[0027] Exemplary embodiments will be described in detail below. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples consistent with some aspects of this invention as detailed in the appended claims.

[0028] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Example

[0030] like Figure 1 As shown, an asphalt fume exhaust gas treatment system is characterized by comprising a circulating dust removal reaction device 1 for filtering out asphalt fumes and particulate pollutants and a regenerative combustion device 2 for burning gaseous pollutants.

[0031] like Figure 2 As shown, the circulating dust removal reaction device 1 includes a Venturi reactor 11, the output end of which is connected to the input end of the rising pipe reactor 12, the output end of which is connected to the input end of the filter 13, and the output end of which is connected to the regenerative combustion device 2.

[0032] like Figure 3As shown, the regenerative combustion device 2 includes a combustion chamber 21 and several regenerative chambers 22. Gaseous pollutants are preheated in the regenerative chambers 22 and then enter the combustion chamber 21 for incineration. A centrifugal fan 26 is installed at the rear end of the regenerative combustion device 2 to discharge the incinerated waste gas.

[0033] In this embodiment: the asphalt fume exhaust gas treatment system includes a circulating dust removal reaction device 1, which mainly reacts with the asphalt fume gas to form large particles containing asphalt fume, and removes the asphalt fume and particulate pollutants in the flue gas through filtration;

[0034] It should be further explained that the circulating dust removal reaction device 1 includes a Venturi reactor 11, a riser reactor 12, a filter 13, a waste outlet 131, and a return material regulating port 132. The Venturi reactor 11 and the riser reactor 12, through changes in the flow interface, increase the exhaust gas velocity and the entropy of the reactant gas, thereby improving the mixing degree of the mixed particulate matter and asphalt residue, promoting the adhesion of exhaust gas and particulate matter, and improving the treatment efficiency of asphalt fumes. The regenerative combustion device 2 includes an internal regenerative chamber 22, a combustion chamber 21, a valve assembly, and supporting instruments. The heat storage chamber 22 is equipped with a heat storage medium to accumulate heat from the combusted exhaust gas and exchange it with cold air, thereby increasing the inlet air temperature and reducing the energy consumption of the combustion system. The regenerative combustion device 2 is equipped with nozzles. If the initial inlet air temperature is too low, the combustion control module 24 controls the entry of natural gas, which is then ignited through the nozzles. If the calorific value of the exhaust gas exchanged with the heat storage chamber 22 is sufficient for combustion, the combustion nozzles can be closed, and the organic waste gas will spontaneously combust in the combustion chamber 21. Each heat storage chamber 22 has three valves at its inlet, allowing for switching between different heat storage chambers 22 based on system operation. The asphalt fume exhaust gas treatment system includes a centrifugal fan at the rear end, which extracts the treated exhaust gas through negative pressure and discharges it through an exhaust stack. A supplementary cooling fan is also included at the rear end of the asphalt fume exhaust gas treatment system. If the temperature of the combustion chamber 21 is too high, the supplementary cooling fan can supply air to lower the temperature of the combustion chamber 21.

[0035] It should be further noted that while the dust removal device 1 reduces particulate matter, gaseous pollutants may still exist, especially VOCs and PAHs. These substances are highly toxic and require further treatment, such as activated carbon adsorption or combustion. Gaseous pollutants mainly include volatile organic compounds (VOCs), sulfides (SO2 and H2S), and nitrogen oxides. The waste gas treatment system treats the waste gas using a dry circulating dust removal + regenerative thermal combustion process, avoiding wastewater generation during the treatment of asphalt-containing waste gas. By reusing filter media, operating costs and system energy consumption are reduced.

[0036] like Figure 3The reason why the exhaust gas comes out of the filter 13 and is directly connected to the heat storage chamber 22 is that if the temperature of the exhaust gas that just enters is too low, it is difficult to reach the combustion temperature. If it directly enters the combustion chamber 21 for combustion, it will consume a lot of fuel (natural gas). The heat storage chamber 22 retains the heat from the previous combustion cycle, which can preheat the exhaust gas. The exhaust gas with a certain temperature can reduce the consumption of fuel (natural gas) when it enters the combustion chamber 21.

[0037] Furthermore, the filter 13 includes a primary filter 13 and a post-filter 13, with the post-filter 13 located behind the primary filter 13.

[0038] In this embodiment: the primary filter uses metal wire mesh with different mesh sizes customized according to the pollutants. The porous structure of the metal wire mesh filters impurities in the gas. The mesh openings retain large particles of impurities outside the mesh, allowing only small particles to pass through, thus achieving impurity separation.

[0039] The post-filter uses a bag filter to further remove particulate matter from the exhaust gas after the initial filtration, preventing particulate matter from entering the downstream combustion device and causing blockage of the heat storage body.

[0040] Primary and post-filters can be designed as a single unit;

[0041] Furthermore, an emergency switch valve 23 is provided between the filter 13 and the regenerative combustion device 2.

[0042] In this embodiment, the function of the emergency switch valve 23 is to allow the exhaust gas to be discharged directly into the exhaust pipe in an emergency if the exhaust gas concentration is too high, the exhaust gas contains only particulate matter, or the regenerative combustion device is broken and cannot be combusted.

[0043] Furthermore, the filter 13 is provided with a waste outlet 131 and a return material adjustment port 132.

[0044] In this embodiment: an electric switch valve is installed at the waste outlet 131, and an electric regulating valve is installed at the return material regulating port 132, so that waste can be discharged or returned for reuse according to the availability of the returned material.

[0045] Furthermore, each of the heat storage chambers 22 is equipped with several switching valves 221 at its inlet.

[0046] In this embodiment: the switching valve 221 can realize the switching between the heat storage chambers 22;

[0047] The main process of the regenerative thermal oxidizer is as follows: the exhaust gas after filtering out particulate pollutants is circulated and preheated through different regenerators 22 before entering the combustion chamber 21 for incineration. The gas after incineration will be back-blown back into the combustion chamber 21 for incineration.

[0048] The specific process flow of a regenerative thermal oxidizer includes:

[0049] Phase 1: The exhaust gas is preheated in the first heat storage chamber and then enters the combustion chamber 21 for combustion. The untreated exhaust gas remaining in the third heat storage chamber is back-blown back into the combustion chamber 21 by the purified gas for incineration (purging function). The decomposed exhaust gas is discharged through the second heat storage chamber, which is heated at the same time.

[0050] Phase 2: The exhaust gas is preheated in the second regenerator and then enters the combustion chamber 21 for combustion. The untreated exhaust gas remaining in the first regenerator is back-blown back into the combustion chamber 21 for incineration after purification. The decomposed exhaust gas is discharged through the third regenerator, while the third regenerator chamber is heated.

[0051] Phase 3: The exhaust gas is preheated in the third heat storage chamber and then enters the combustion chamber 21 for combustion. The untreated exhaust gas remaining in the second heat storage chamber is back-blown back into the combustion chamber 21 for incineration after decomposition. The exhaust gas is discharged through the first heat storage chamber, while the first heat storage chamber is heated.

[0052] Furthermore, the combustion chamber 21 is connected to a natural gas pipeline, and a control module 24 is installed on the natural gas pipeline. If the initial inlet temperature is too low, the natural gas can be controlled to enter through the control module 24 and ignited through the nozzle. If the calorific value of the exhaust gas that has been heat-exchanged through the heat storage chamber 22 is sufficient for combustion, the combustion nozzle can be closed, and the organic exhaust gas will spontaneously combust in the combustion chamber 21.

[0053] Furthermore, a temperature detection device 25 is provided on the outside of the heat storage chamber 22 and the combustion chamber 21.

[0054] Furthermore, the heat storage chamber 22 is connected to an exhaust fan, and the combustion chamber 21 is connected to an air fan. The exhaust fan introduces waste gas into the exhaust stack for discharge, while the air fan replenishes oxygen to the combustion chamber 21 for combustion.

[0055] Furthermore, the combustion chamber 21 is equipped with a supplemental cooling device. The asphalt fume treatment system includes a regenerative combustion device and supplemental cooling measures.

[0056] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model.

[0057] It should be understood that this utility model is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. An asphalt fume exhaust gas treatment system characterized by comprising: The application relates to a circulating dust removal reaction device (1) for filtering asphalt smoke and particle pollutants and a regenerative combustion device (2) for burning gaseous pollutants. The circulating dust removal reaction device (1) comprises a venturi reactor (11), the output end of the venturi reactor (11) is connected to the input end of an updraft pipe reactor (12), the output end of the updraft pipe reactor (12) is connected to the input end of a filter (13), and the output end of the filter (13) is connected to the regenerative combustion device (2). The regenerative combustion device (2) comprises a combustion chamber (21) and a plurality of regenerative chambers (22), gaseous pollutants are preheated in the regenerative chambers (22) and then enter the combustion chamber (21) for incineration treatment.

2. The asphalt fume exhaust treatment system of claim 1, wherein, The filter (13) comprises a primary filter and a rear filter.

3. The asphalt fume exhaust treatment system of claim 1, wherein, An emergency switch valve (23) is arranged between the filter (13) and the regenerative combustion device (2).

4. The asphalt fume exhaust treatment system of claim 1, wherein, A waste outlet (131) and a return material adjusting port (132) are arranged on the filter (13).

5. The asphalt fume exhaust treatment system of claim 1, wherein, Switch valves (221) are arranged on the inlets of the regenerative chambers (22).

6. The asphalt fume exhaust treatment system of claim 1, wherein, A natural gas pipeline is connected to the combustion chamber (21), and a control module (24) is arranged on the natural gas pipeline.

7. The asphalt fume exhaust treatment system of claim 1, wherein Temperature detection devices (25) are arranged outside the regenerative chambers (22) and the combustion chamber (21).

8. The asphalt fume exhaust treatment system of claim 1, wherein, An exhaust fan is connected to the regenerative chambers (22), and an air fan is connected to the combustion chamber (21).

9. The asphalt fume exhaust treatment system of claim 1, wherein, The combustion chamber (21) is matched with a cooling device.

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