Asphalt smoke waste gas treatment system and treatment method thereof

Abstract

The invention belongs to the technical field of environmental protection equipment, and relates to an asphalt fume waste gas treatment system and treatment method. 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] The present invention belongs to the technical field of environmental protection equipment, and relates to an asphalt fume waste gas treatment system and a treatment method thereof. Background Art

[0002] Currently, most asphalt fume treatment devices on the market generally adopt the following treatment mode: First, the asphalt fume is preliminarily filtered by means of a spray tower, then the separation of harmful substances is enhanced by the electrocapture method, and finally the purification of the asphalt fume is achieved by activated carbon adsorption. However, such treatment devices have obvious drawbacks. When using the clear water spray structure, the clear water only serves as a one-time treatment medium, and the waste of water resources is extremely serious. The water after spraying cannot be effectively reused. Moreover, the asphalt fume after being sprayed with clear water needs to be transported through a pipeline before entering the electrocoking tar separator. Over time, a large amount of asphalt fume impurities will adhere to the inner wall of the pipeline, resulting in the problem of secondary pollution of the asphalt fume. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and propose an asphalt fume waste gas treatment system and a treatment method thereof.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

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

[0006] The circulating dust removal reaction device includes a Venturi reactor, the output end of the Venturi reactor is connected to the input end of the rising pipeline reactor, the output end of the rising pipeline reactor is connected to the input end of the filter, and the output end of the filter is connected to the regenerative combustion device;

[0007] The regenerative combustion device includes a combustion chamber and a plurality of regenerative chambers. The gaseous pollutants are preheated through the regenerative chambers and then enter the combustion chamber for incineration treatment; a centrifugal fan is arranged at the rear end of the regenerative combustion device, and the waste gas after incineration treatment is discharged through the centrifugal fan.

[0008] Further, the filter includes a primary filter and a post-filter, and the post-filter is located behind the primary filter.

[0009] Further, an emergency shut-off valve is arranged between the filter and the regenerative combustion device.

[0010] Further, a waste outlet and a return material adjustment port are arranged on the filter.

[0011] Further, a plurality of switching valves are arranged at the inlet of each regenerative chamber.

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

[0013] Furthermore, temperature detection devices are provided outside both the regenerator and the combustion chamber.

[0014] Furthermore, an air blower is connected to the combustion chamber.

[0015] Furthermore, a supplementary cooling device is provided for the combustion chamber.

[0016] The present invention also provides a treatment method based on the asphalt fume waste gas treatment system, which specifically includes the following steps:

[0017] Step 1: The waste gas passes through a Venturi reactor, an ascending pipeline reactor, and a filter in sequence to filter out particulate pollutants.

[0018] Step 2: The waste gas from which particulate pollutants have been filtered circulates through different regenerators for preheating and then enters the combustion chamber for incineration treatment. The gas after incineration treatment will blow the waste gas remaining in the regenerator in the previous cycle back into the combustion chamber for incineration.

[0019] Step 3: The waste gas after incineration treatment is discharged through another regenerator while heating this regenerator.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention provides an asphalt fume waste gas treatment system. The asphalt fume waste gas enters the circulating dust removal reaction device, reacts with the asphalt fume in the asphalt fume by means of particulate filter media in the Venturi reactor and the ascending pipeline reactor to form large particles containing asphalt fume, and then the asphalt fume and particulate pollutants in the flue gas are removed through the filter; the filtered particulate material is discharged as waste or recycled according to the availability of the returned material through the electric on-off valves and electric control valves provided at the waste outlet and the returned material adjustment port; in short, the circulating dust removal reaction device mainly reacts with the asphalt fume to form large particles containing asphalt fume, and removes the asphalt fume and particulate pollutants in the flue gas through filtration.

[0022] 2. The asphalt fume waste gas treatment system includes a circulating dust removal reaction device. The waste gas passing through the front-end dust removal enters the subsequent regenerative combustion device for combustion treatment of the organic components in the waste gas. The temperature of the combustion product is 1000 °C. The waste gas after combustion is negatively extracted by a centrifugal fan, and then discharged through the centrifugal fan, which will not cause secondary pollution of the asphalt fume.

[0023] In summary, the process of dry cycling dust removal + regenerative combustion is adopted, effectively solving the sewage problem generated by conventional wet treatment of asphalt fumes, and can effectively remove asphalt fumes, and will not cause secondary pollution of asphalt fumes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings herein are incorporated into and constitute a part of this specification, and together with the specification are used to explain the principles of the present invention.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is a schematic structural diagram of the asphalt fume waste treatment system of the present invention;

[0027] Figure 2 is a schematic structural diagram of part A (circulating dust removal reaction device) of the asphalt fume waste treatment system of the present invention;

[0028] Figure 3 is a schematic structural diagram of part B (regenerative combustion device) of the asphalt fume waste treatment system of the present invention.

[0029] Wherein: 1 is a circulating dust removal reaction device; 11 is a Venturi reactor; 12 is an upward pipe reactor; 13 is a filter; 131 is a waste outlet; 132 is a return material adjustment 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 shut-off valve; 24 is a control module; 25 is a temperature detection device; 26 is a centrifugal fan. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Here, the exemplary embodiments will be described in detail. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. On the contrary, they are only examples consistent with some aspects of the present invention detailed in the appended claims.

[0031] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] Embodiment

[0033] As Figure 1 shown, an asphalt fume waste gas treatment system includes a circulating dust removal reaction device 1 for filtering asphalt fumes and particulate pollutants and a regenerative combustion device 2 for burning gaseous pollutants;

[0034] As Figure 2 shown, the cyclic dust removal reaction device 1 includes a Venturi reactor 11. The output end of the Venturi reactor 11 is connected to the input end of the rising pipeline reactor 12. The output end of the rising pipeline reactor 12 is connected to the input end of the filter 13. The output end of the filter 13 is connected to the regenerative combustion device 2;

[0035] As Figure 3 shown, the regenerative combustion device 2 includes a combustion chamber 21 and a plurality of regenerative chambers 22. Gaseous pollutants enter the combustion chamber 21 for incineration treatment after being preheated through the regenerative chambers 22. A centrifugal fan 26 is arranged at the rear end of the regenerative combustion device 2, and the exhaust gas after incineration treatment is discharged through the centrifugal fan 26.

[0036] In this embodiment: The asphalt fume waste gas treatment system includes a cyclic dust removal reaction device 1, which mainly reacts with asphalt fumes to form large particles containing asphalt fumes, and removes asphalt fumes and particulate pollutants in the waste gas through filtration;

[0037] It should be further noted that the cyclic dust removal reaction device 1 includes a Venturi reactor 11, a rising pipeline reactor 12, a filter 13, a waste outlet 131 and a return material adjustment port 132. By changing the equipment flow interface between the Venturi reactor 11 and the rising pipeline reactor 12, the waste gas flow rate is increased, the entropy value of the reaction gas is increased, so as to improve the mixing degree of mixed particulate matter and asphalt extension, promote the adhesion of waste gas and particulate material, and improve the treatment efficiency of asphalt fumes. The regenerative combustion device 2 includes an internal regenerative chamber 22, a combustion chamber 21, a valve group and supporting instruments. Heat storage bodies are arranged inside the regenerative chamber 22, which can accumulate the heat in the exhausted gas after combustion and exchange heat with cold air to increase the intake air temperature and reduce the energy consumption of the combustion system. Nozzles are arranged inside the regenerative combustion device 2. When the initial intake air temperature is too low, natural gas can be controlled to enter through the combustion control module 24 and ignited through the nozzles. Subsequently, if the heat value of the exhaust gas exchanged by the regenerative chamber 22 is sufficient for combustion, the combustion nozzles can be closed, and the organic waste gas will burn spontaneously in the combustion chamber 21. Three valves are arranged at the inlet of each regenerative chamber 22, and different regenerative chambers 22 are switched according to the operation conditions of the system. The rear end of the asphalt fume waste gas treatment system includes a centrifugal fan, which extracts the treated waste gas through negative pressure and then discharges it through an exhaust stack. The rear end of the asphalt fume waste gas treatment system includes a supplementary cooling fan. If the temperature of the combustion chamber 21 is too high, air can be supplemented through the supplementary cooling fan to reduce the temperature of the combustion chamber 21.

[0038] It should be further noted that after the dust removal treatment is carried out by the circulating dust removal device 1, the particulate matter is reduced, but gaseous pollutants may still exist, especially VOCs and PAHs. These substances are highly toxic and need to be further treated, such as activated carbon adsorption or combustion. The gaseous pollutants mainly include volatile organic compounds (VOCs), sulfides (S0 2 and H 2 S), nitrogen oxides, etc. The waste gas treatment system treats the waste gas through the dry method circulating dust removal + regenerative combustion process, avoiding the generation of sewage during the treatment of the asphalt-containing waste gas, reducing the operating cost and the energy consumption of the system through the reuse of the filter material.

[0039] Such as Figure 3 In [reference], the reason why the waste gas coming out of the filter 13 is directly connected to the regenerative chamber 22 is that if the temperature of the newly incoming waste gas is too low, it is difficult to reach the combustion temperature. If it directly enters the combustion chamber 21 for combustion, a large amount of fuel (natural gas) will be consumed. The regenerative chamber 22 retains the heat from the previous combustion cycle and can preheat the waste gas. The waste gas with a certain temperature entering the combustion chamber 21 can reduce the consumption of fuel (natural gas).

[0040] Furthermore, the filter 13 includes a primary filter and a post-filter, and the post-filter is located behind the primary filter.

[0041] In this embodiment: The primary filter uses a metal wire mesh with different meshes customized according to the pollutants. Through the porous structure of the metal wire mesh, the impurities in the gas are filtered. The large-particle impurities are left outside the mesh by using the mesh holes of the wire mesh, and only small particles are allowed to pass through the mesh holes, thereby realizing the separation of impurities;

[0042] The post-filter adopts a bag filter to further remove the particulate matter in the waste gas after the primary filtration, preventing the particulate matter from entering the backend combustion device and causing blockage of the regenerator;

[0043] The primary filter and the post-filter can be designed as an integrated device;

[0044] Furthermore, an emergency shut-off valve 23 is provided between the filter 13 and the regenerative combustion device 2.

[0045] In this embodiment: The function of the emergency shut-off valve 23 is that if the waste gas concentration is too high, the waste gas only contains particulate matter, or the regenerative combustion device is damaged and cannot burn, in an emergency, the waste gas can directly enter the exhaust pipe through this valve to discharge the waste gas.

[0046] Furthermore, a waste outlet 131 and a return material adjustment port 132 are provided on the filter 13.

[0047] In this embodiment, an electric switch valve is provided at the waste outlet 131, and an electric control valve is provided at the return material adjustment port 132. The waste can be discharged or the return material can be recycled according to the availability of the return material.

[0048] Further, a plurality of switching valves 221 are provided at the inlet of each heat storage chamber 22.

[0049] In this embodiment, the switching valve 221 can realize the switching between the heat storage chambers 22;

[0050] Further, the combustion chamber 21 is connected to a natural gas pipeline, and a control module 24 is provided on the natural gas pipeline. When the initial intake air temperature is too low, the natural gas can be controlled to enter through the control module 24, and the nozzle is ignited for combustion. If the waste gas heated by the heat storage chamber 22 in the subsequent process has sufficient calorific value for combustion, the combustion nozzle can be closed, and the organic waste gas can be self-ignited in the combustion chamber 21;

[0051] Further, a temperature detection device 25 is provided outside the heat storage chamber 22 and the combustion chamber 21.

[0052] Further, the heat storage chamber 22 is connected to an exhaust fan, and the combustion chamber 21 is connected to an air blower. The exhaust fan introduces the waste gas into the exhaust stack for discharge, and the air blower supplies oxygen to the combustion chamber 21 for combustion.

[0053] Further, the combustion chamber 21 is equipped with a supplementary cooling device. The asphalt fume waste gas treatment system includes a regenerative combustion device and supplementary cooling measures.

[0054] The present invention also provides a treatment method based on the asphalt fume waste gas treatment system, which specifically includes the following steps:

[0055] Step 1: The waste gas sequentially passes through the Venturi reactor 11, the rising pipe reactor 12, and the filter 13 to filter out particulate pollutants;

[0056] Step 2: The waste gas filtered out of particulate pollutants is circulated through different heat storage chambers 22 for preheating and then enters the combustion chamber 21 for incineration treatment. The gas after incineration treatment is used to blow back the waste gas remaining in the heat storage chamber 22 in the previous cycle into the combustion chamber 21 for incineration;

[0057] Step 3: The waste gas after incineration treatment is discharged through another heat storage chamber 22 while heating this heat storage chamber 22.

[0058] In this embodiment, the specific process flow of the regenerative incinerator in Step 2 includes:

[0059] Stage 1: The waste gas is preheated through the first regenerator and then enters the combustion chamber 21 for combustion. The unprocessed waste gas remaining in the third regenerator is blown back into the combustion chamber 21 by the purified gas for incineration treatment (purge function). The decomposed waste gas is discharged through the second regenerator, and at the same time, the second regenerator is heated.

[0060] Stage 2: The waste gas is preheated through the second regenerator and then enters the combustion chamber 21 for combustion. The unprocessed waste gas remaining in the first regenerator is blown back into the combustion chamber 21 by the purified gas for incineration treatment. The decomposed waste gas is discharged through the third regenerator, and at the same time, the third regenerator is heated.

[0061] Stage 3: The waste gas is preheated through the third regenerator and then enters the combustion chamber 21 for combustion. The unprocessed waste gas remaining in the second regenerator is blown back into the combustion chamber 21 by the purified gas for incineration treatment. The decomposed waste gas is discharged through the first regenerator, and at the same time, the first regenerator is heated.

[0062] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0063] It should be understood that the present invention is not limited to the above-described content and can be variously modified and changed without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A asphalt fume waste gas treatment system, characterized in that: It comprises a circulating dust removal reaction device (1) for filtering out particulate pollutants and a heat storage 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 the ascending pipeline reactor (12), the output end of the ascending pipeline reactor (12) is connected to the input end of the filter (13), and the output end of the filter (13) is connected to the heat storage 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; a centrifugal fan (26) is provided at the rear end of the regenerative combustion device (2), and waste gas after incineration treatment is discharged through the centrifugal fan (26).

2. The asphalt fume exhaust gas treatment system according to claim 1, characterized in that: The filter (13) comprises a primary filter and a post-filter, wherein the post-filter is located behind the primary filter.

3. The asphalt fume exhaust gas treatment system according to claim 1, characterized in that: An emergency switch valve (23) is provided between the filter (13) and the heat storage combustion device (2).

4. The asphalt fume exhaust gas treatment system according to claim 1, characterized in that: The filter (13) is provided with a waste material outlet (131) and a return material regulating port (132).

5. The asphalt fume exhaust gas treatment system according to claim 1, characterized in that: The inlet of each heat storage chamber (22) is provided with a plurality of switching valves (221).

6. The asphalt fume exhaust gas treatment system according to claim 1, characterized in that: The combustion chamber (21) is connected to a natural gas pipeline, and a control module (24) is arranged on the natural gas pipeline.

7. The asphalt fume exhaust gas treatment system according to claim 1, characterized in that: Temperature detection devices (25) are provided outside the heat storage chamber (22) and the combustion chamber (21).

8. The asphalt fume exhaust gas treatment system according to claim 1, characterized in that: The combustion chamber (21) is connected to an air blower.

9. The asphalt fume exhaust gas treatment system according to claim 1, characterized in that: The combustion chamber (21) is equipped with a cooling supplement device.

10. The method for treating asphalt fume waste gas according to any one of claims 1 to 9, characterized in that: The specific steps include: Step 1: the exhaust gas passes through the venturi reactor (11), the rising pipe reactor (12), and the filter (13) in sequence to filter out particulate pollutants; Step 2: the waste gas from which particulate pollutants have been filtered out is circulated through different heat storage chambers (22) for preheating and then enters the combustion chamber (21) for incineration. The waste gas remaining in the heat storage chamber (22) in the previous cycle is blown back to the combustion chamber (21) for incineration by the incineration gas; Step 3: The waste gas after the incineration treatment is discharged through another heat storage chamber (22) while heating the heat storage chamber (22).

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