CN117205716A - Purification control method for plant-mixed thermal regeneration tail gas - Google Patents
Purification control method for plant-mixed thermal regeneration tail gas Download PDFInfo
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- CN117205716A CN117205716A CN202311471519.3A CN202311471519A CN117205716A CN 117205716 A CN117205716 A CN 117205716A CN 202311471519 A CN202311471519 A CN 202311471519A CN 117205716 A CN117205716 A CN 117205716A
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- draft fan
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000000746 purification Methods 0.000 title claims abstract description 19
- 230000008929 regeneration Effects 0.000 title description 7
- 238000011069 regeneration method Methods 0.000 title description 7
- 239000000843 powder Substances 0.000 claims abstract description 124
- 238000005507 spraying Methods 0.000 claims abstract description 52
- 239000007789 gas Substances 0.000 claims abstract description 50
- 239000000428 dust Substances 0.000 claims abstract description 44
- 239000010426 asphalt Substances 0.000 claims abstract description 40
- 239000004744 fabric Substances 0.000 claims abstract description 26
- 239000000779 smoke Substances 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 230000007246 mechanism Effects 0.000 claims abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003546 flue gas Substances 0.000 claims abstract description 14
- 230000007704 transition Effects 0.000 claims description 24
- 238000005303 weighing Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Abstract
The application belongs to the field of plant-mixed hot regenerated tail gas treatment, and particularly relates to a purification control method of plant-mixed hot regenerated tail gas, which is used for purifying regenerated tail gas based on a bag-type dust remover and a powder spraying device; the cloth bag dust collector comprises a cloth bag dust collector body, an air inlet pipe connected with the cloth bag dust collector body for the regenerated tail gas to enter, an induced draft fan connected with an air outlet of the cloth bag dust collector body, an exhaust pipe connected with the induced draft fan and an asphalt flue gas detection mechanism arranged on the exhaust pipe; the powder spraying device comprises a powder spraying pipe connected with the air inlet pipe, a powder bin for storing powder, a Roots blower connected with the powder spraying pipe and an impeller feeder connected between the Roots blower and the powder bin; the rotating speed of the impeller feeder is linked by the rotating speed of the induced draft fan, so that the automatic control of the powder spraying amount is realized, the rotating speed of the impeller feeder is adjusted according to the asphalt smoke content detected in real time by the asphalt smoke detection mechanism, and meanwhile, the linear relation between the rotating speed of the impeller feeder and the rotating speed of the induced draft fan is corrected, so that the powder spraying amount is accurately controlled.
Description
Technical Field
The application belongs to the field of plant-mix thermal regeneration tail gas treatment, and particularly relates to a purification control method of plant-mix thermal regeneration tail gas.
Background
The green mixture hot-mix plant regeneration technology is the most widely used technology for recycling waste asphalt mixtures. In the prior art, the plant-mixed heat regeneration can be divided into two modes of forward-flow heating and countercurrent heating according to a heating structure, the treatment modes of the regenerated tail gas generated in the two modes are different, the temperature of the regenerated tail gas generated in the forward-flow heating is higher, the regenerated tail gas is led into the primary drying roller to carry out secondary combustion treatment, and the regenerated tail gas is filtered by a bag-type dust remover along with the tail gas generated in the primary drying roller. The temperature of the regenerated tail gas generated by countercurrent heating is lower, the regenerated tail gas is independently introduced into a cloth bag dust remover for filtering treatment, the regenerated tail gas needs to be purified before entering the cloth bag dust remover, at the moment, the reclaimed powder or mineral powder is mainly sprayed into a pipeline by a powder spraying device before entering the cloth bag dust remover, the powder and the regenerated tail gas are firstly mixed, asphalt smoke in the regenerated tail gas is adsorbed, and then the regenerated tail gas is filtered by the cloth bag dust remover, so that the asphalt smoke in the regenerated tail gas is prevented from directly contacting with a cloth bag, and asphalt smoke pollution caused by the cloth bag is avoided.
The prior art has the following problems that the generated regenerated tail gas amount also changes along with the change of the yield, the existing powder spraying device can only manually adjust the powder feeding amount, and the defect of insufficient powder feeding amount caused by untimely operation at the moment can be caused, so that the cloth bag is polluted by asphalt smoke in the regenerated tail gas, and the service life of the cloth bag is reduced. Or the powder spraying amount is too large, so that the energy consumption of the bag-type dust collector is wasted. In the prior art, a microwave flow switch or other detection equipment is arranged in a powder spraying pipeline to detect whether powder flows in the pipeline, but the detection point is single, once the microwave flow switch fails or is interfered to generate an error signal, misoperation is brought to operators, finally, the powder spraying failure is caused, and a cloth bag is completely polluted and cannot be used in severe cases, so that economic loss is caused. Meanwhile, in the reproduction process, because asphalt smoke is not adsorbed by powder, environmental pollution is caused outside the equipment; further improvements are needed.
Disclosure of Invention
The application aims to overcome the defects of the prior art and provides a purification control method for plant-mixed hot regenerated tail gas.
The application adopts the following technical scheme:
a purification control method of plant-mixed hot regenerated tail gas is based on a cloth bag dust remover and a powder spraying device to purify the regenerated tail gas;
the cloth bag dust collector comprises a cloth bag dust collector body, an air inlet pipe connected with the cloth bag dust collector body for the regenerated tail gas to enter, an induced draft fan connected with an air outlet of the cloth bag dust collector body, an exhaust pipe connected with the induced draft fan and an asphalt flue gas detection mechanism arranged on the exhaust pipe;
the powder spraying device comprises a powder spraying pipe connected with the air inlet pipe, a powder bin for storing powder, a Roots blower connected with the powder spraying pipe and an impeller feeder connected between the Roots blower and the powder bin;
the purification control method comprises the following specific operations:
according to the preset linear relation between the rotating speed of the induced draft fan and the rotating speed of the impeller feeder, the rotating speed of the induced draft fan and the rotating speed of the impeller feeder are controlled, the asphalt smoke detection mechanism detects the asphalt smoke content in tail gas in real time, and when the asphalt smoke content is not higher than a set threshold value, the rotating speed of the induced draft fan and the rotating speed of the impeller feeder are maintained or adjusted according to the preset linear relation; when the asphalt smoke content is higher than a set threshold, independently adjusting the rotating speed of the impeller feeder until the asphalt content in the tail gas is not higher than the set threshold, correcting the linear relation between the rotating speed of the induced draft fan and the rotating speed of the impeller feeder, and maintaining or adjusting the rotating speeds of the impeller feeder and the induced draft fan according to the corrected linear relation.
Further, the powder spraying device also comprises a transition powder bin connected with the discharge port of the powder bin and a weighing sensor arranged on the transition powder bin, and the impeller feeder is connected between the Roots blower and the transition powder bin; the weighing sensor detects the weight of the transition powder bin in real time to obtain the powder feeding rate in unit time, and when the powder feeding rate is higher or lower than a preset threshold range, the powder spraying device and the bag-type dust remover are controlled to stop and overhaul.
Further, the powder spraying device further comprises a microwave flow switch arranged on the powder spraying pipe, and when the powder flow detected by the microwave flow switch and/or the obtained powder feeding rate are not within a preset threshold range, the powder spraying device and the bag-type dust remover are controlled to stop and overhaul.
Further, the powder spraying device further comprises a discharging pipe arranged between the transition powder bin and the powder bin and a pneumatic butterfly valve arranged on the discharging pipe, and when the weight of the transition powder bin obtained by the weighing sensor is lower than a preset value, the pneumatic butterfly valve is controlled to be opened for feeding; when the weight of the transition powder bin obtained by the weighing sensor is higher than a preset value, the pneumatic butterfly valve is controlled to be closed to stop feeding.
Further, the asphalt flue gas detection mechanism comprises a gas concentration sensor which is arranged on the exhaust pipe and used for detecting the concentration of asphalt flue gas.
Further, the air inlet pipe comprises a connecting section connected with the air inlet of the bag-type dust collector body and a mixing section vertically arranged on the connecting section, one end of the powder spraying pipe is connected with the mixing section, and powder enters the mixing section through the powder spraying pipe and is mixed with regenerated tail gas, and then the bag-type dust collector body is purified through the connecting section.
Further, the rotational speed of the induced draft fan and the rotational speed of the impeller feeder are in a positive-correlation linear relation.
As can be seen from the above description of the present application, compared with the prior art, the present application has the following beneficial effects: according to the application, through the cooperation among the impeller feeder, the induced draft fan and the asphalt flue gas detection mechanism, the rotating speed of the impeller feeder is linked by the rotating speed of the induced draft fan, so that the automatic control of the powder spraying amount is realized, the rotating speed of the impeller feeder is adjusted according to the asphalt flue gas content detected in real time by the asphalt flue gas detection mechanism, and meanwhile, the linear relation between the rotating speed of the impeller feeder and the rotating speed of the induced draft fan is corrected, so that the powder spraying amount is accurately controlled, the service life of the bag-type dust collector is ensured, and the waste of resources is reduced;
further increase transition powder storehouse and weighing sensor, realize the accurate digital control of powder feed quantity through the mode of weighing, not only solved the hidden danger that microwave flow switch single-point detected to exist, can realize the accurate control of digitization to the powder feed quantity moreover to more effective realization powder spraying automation control.
Drawings
FIG. 1 is a schematic diagram of a purification apparatus;
FIG. 2 is a schematic flow chart of the present application;
in the figure, a 1-bag-type dust collector, a 2-powder spraying device, a 11-bag-type dust collector body, a 12-air inlet pipe, a 121-connecting section, a 122-mixing section, a 13-induced draft fan, a 14-air outlet pipe, a 15-asphalt smoke detection mechanism, a 21-powder spraying pipe, a 22-powder bin, a 23-transition powder bin, a 24-weighing sensor, a 25 Roots blower, a 26-impeller feeder, a 27-microwave flow switch, a 28-discharging pipe and a 29-pneumatic butterfly valve.
Detailed Description
The application is further described below by means of specific embodiments.
Referring to fig. 1 to 2, a purification device for plant-mix thermal regeneration tail gas comprises a bag-type dust collector 1 and a powder spraying device 2.
The cloth bag dust collector 1 comprises a cloth bag dust collector body 11, an air inlet pipe 12 connected with the cloth bag dust collector body 11 for the regenerated tail gas to enter, an induced draft fan 13 connected with an air outlet of the cloth bag dust collector body 11, an exhaust pipe 14 connected with the induced draft fan 13 and an asphalt flue gas detection mechanism 15 arranged on the exhaust pipe 14; specifically, the asphalt fume detection mechanism 15 includes a gas concentration sensor provided on the exhaust pipe 14 to detect the concentration of asphalt fume; further, the air inlet pipe 12 comprises a connecting section 121 connected with the air inlet of the bag-type dust collector body 11 and a mixing section 122 vertically arranged on the connecting section 121, and the regenerated tail gas enters the bag-type dust collector body 11 from the mixing section 122 and then enters the bag-type dust collector body 11 through the connecting section 121 for purification treatment.
The powder spraying device 2 comprises a powder spraying pipe 21 connected with the air inlet pipe 12, a powder bin 22 for storing powder, a transition powder bin 23 connected with a discharge hole of the powder bin 22, a weighing sensor 24 arranged on the transition powder bin 23, a Roots blower 25 connected with the powder spraying pipe 21, an impeller feeder 26 arranged between the discharge hole of the transition powder bin 23 and the Roots blower 25, a microwave flow switch 27 arranged on the powder spraying pipe 21, a discharge pipe 28 arranged between the transition powder bin 23 and the powder bin 22 and a pneumatic butterfly valve 29 arranged on the discharge pipe 28; specifically, the powder spraying pipe 21 is connected with the mixing section 122, the powder is sent into the mixing section 122 through the Roots blower 25 to be mixed with the regenerated tail gas entering the mixing section 122, and the powder enters the bag-type dust collector body 11 through the connecting section 121 to be purified.
The purification control method for the plant-mixed hot regenerated tail gas based on the device comprises the following specific steps:
step one, controlling the rotating speed of the induced draft fan 13 and the rotating speed of the impeller feeder 26 according to the preset linear relation between the rotating speed of the induced draft fan 13 and the rotating speed of the impeller feeder 26, detecting the content of asphalt smoke in tail gas in real time by the asphalt smoke detecting mechanism 15, and keeping or adjusting the rotating speed of the induced draft fan 13 and the rotating speed of the impeller feeder 16 according to the preset linear relation when the content of asphalt smoke is not higher than a set threshold value; when the asphalt smoke content is higher than a set threshold value, independently adjusting the rotating speed of the impeller feeder 26 until the asphalt content in the tail gas is not higher than the set threshold value, simultaneously correcting the linear relation between the rotating speed of the induced draft fan 13 and the rotating speed of the impeller feeder 26, and maintaining or adjusting the rotating speeds of the impeller feeder 26 and the induced draft fan 13 according to the corrected linear relation, wherein the rotating speed of the induced draft fan 13 and the rotating speed of the impeller feeder 26 are in a positively correlated linear relation;
step two, the weighing sensor 24 detects the weight of the transition powder bin 23 in real time to obtain the powder feeding rate in unit time, the microwave flow switch 27 detects the powder flow rate in the powder spraying pipe 21 in real time, and when the powder flow rate detected by the microwave flow switch 27 and/or the obtained powder feeding rate are not in a preset threshold range, the powder spraying device 2 and the bag-type dust collector 1 are controlled to stop for maintenance, namely, when the obtained powder flow rate and/or the obtained powder feeding rate are higher or lower than the preset threshold range, the powder spraying device 2 and the bag-type dust collector 1 are controlled to stop for maintenance;
step three, when the weighing sensor 24 obtains that the weight of the transition powder bin 23 is lower than a preset value, the pneumatic butterfly valve 29 is controlled to be opened so as to supplement the transition powder bin 23; when the weight of the transition powder bin 23 acquired by the weighing sensor 24 is higher than a preset value, the pneumatic butterfly valve 29 is controlled to be closed to stop feeding.
According to the application, through the cooperation among the impeller feeder 26, the induced draft fan 13 and the asphalt flue gas detection mechanism 15, the rotation speed of the impeller feeder 26 is linked by the rotation speed of the induced draft fan 13, so that the automatic control of the powder spraying amount is realized, the rotation speed of the impeller feeder 26 is adjusted according to the asphalt flue gas content detected in real time by the asphalt flue gas detection mechanism 15, and meanwhile, the linear relation between the rotation speed of the impeller feeder 26 and the rotation speed of the induced draft fan 13 is corrected, so that the powder spraying amount is accurately controlled, the service life of the bag-type dust collector 1 is ensured, and the waste of resources is reduced; wherein, further increase transition powder storehouse 23 and weighing sensor 24, realize the accurate digital control of powder feed quantity through the mode of weighing, not only solved microwave flow switch 27 single-point and detected the hidden danger that exists, can realize the accurate control of digitization to the powder feed quantity moreover to more effective realization powder spraying automation control.
The foregoing description is only illustrative of the preferred embodiments of the present application and is not to be construed as limiting the scope of the application, i.e., the application is not limited to the specific embodiments described herein, but is intended to cover all modifications and equivalent arrangements included within the scope of the application.
Claims (7)
1. A purification control method of plant-mixed hot regenerated tail gas is characterized by comprising the following steps: purifying the regenerated tail gas based on a bag-type dust remover and a powder spraying device;
the cloth bag dust collector comprises a cloth bag dust collector body, an air inlet pipe connected with the cloth bag dust collector body for the regenerated tail gas to enter, an induced draft fan connected with an air outlet of the cloth bag dust collector body, an exhaust pipe connected with the induced draft fan and an asphalt flue gas detection mechanism arranged on the exhaust pipe;
the powder spraying device comprises a powder spraying pipe connected with the air inlet pipe, a powder bin for storing powder, a Roots blower connected with the powder spraying pipe and an impeller feeder connected between the Roots blower and the powder bin;
the purification control method comprises the following specific operations:
according to the preset linear relation between the rotating speed of the induced draft fan and the rotating speed of the impeller feeder, the rotating speed of the induced draft fan and the rotating speed of the impeller feeder are controlled, the asphalt smoke detection mechanism detects the asphalt smoke content in tail gas in real time, and when the asphalt smoke content is not higher than a set threshold value, the rotating speed of the induced draft fan and the rotating speed of the impeller feeder are maintained or adjusted according to the preset linear relation; when the asphalt smoke content is higher than a set threshold, independently adjusting the rotating speed of the impeller feeder until the asphalt content in the tail gas is not higher than the set threshold, correcting the linear relation between the rotating speed of the induced draft fan and the rotating speed of the impeller feeder, and maintaining or adjusting the rotating speeds of the impeller feeder and the induced draft fan according to the corrected linear relation.
2. The purification control method of plant-mixed hot regenerated tail gas according to claim 1, wherein the method comprises the following steps: the powder spraying device also comprises a transition powder bin connected with the discharge port of the powder bin and a weighing sensor arranged on the transition powder bin, and the impeller feeder is connected between the Roots blower and the transition powder bin; the weighing sensor detects the weight of the transition powder bin in real time to obtain the powder feeding rate in unit time, and when the powder feeding rate is higher or lower than a preset threshold range, the powder spraying device and the bag-type dust remover are controlled to stop and overhaul.
3. The purification control method of plant-mixed hot regenerated tail gas according to claim 2, wherein the method comprises the following steps: the powder spraying device further comprises a microwave flow switch arranged on the powder spraying pipe, and when the powder flow detected by the microwave flow switch and/or the obtained powder feeding rate are not within a preset threshold range, the powder spraying device and the bag-type dust remover are controlled to stop and overhaul.
4. The purification control method of plant-mixed hot regenerated tail gas according to claim 2, wherein the method comprises the following steps: the powder spraying device further comprises a discharging pipe arranged between the transition powder bin and the powder bin and a pneumatic butterfly valve arranged on the discharging pipe, and when the weight of the transition powder bin obtained by the weighing sensor is lower than a preset value, the pneumatic butterfly valve is controlled to be opened for feeding; when the weight of the transition powder bin obtained by the weighing sensor is higher than a preset value, the pneumatic butterfly valve is controlled to be closed to stop feeding.
5. The purification control method of plant-mixed hot regenerated tail gas according to claim 1, wherein the method comprises the following steps: the asphalt flue gas detection mechanism comprises a gas concentration sensor which is arranged on the exhaust pipe and used for detecting the concentration of asphalt flue gas.
6. The purification control method of plant-mixed hot regenerated tail gas according to claim 1, wherein the method comprises the following steps: the air inlet pipe comprises a connecting section connected with an air inlet of the bag-type dust collector body and a mixing section vertically arranged on the connecting section, one end of the powder spraying pipe is connected with the mixing section, and powder enters the mixing section through the powder spraying pipe and is mixed with regenerated tail gas, and then the bag-type dust collector body is purified through the connecting section.
7. The purification control method of plant-mixed hot regenerated tail gas according to claim 1, wherein the method comprises the following steps: the rotating speed of the induced draft fan and the rotating speed of the impeller feeder are in a positive-correlation linear relation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311471519.3A CN117205716B (en) | 2023-11-07 | 2023-11-07 | Purification control method for plant-mixed thermal regeneration tail gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311471519.3A CN117205716B (en) | 2023-11-07 | 2023-11-07 | Purification control method for plant-mixed thermal regeneration tail gas |
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| CN117205716A true CN117205716A (en) | 2023-12-12 |
| CN117205716B CN117205716B (en) | 2024-04-16 |
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| CN116440687A (en) * | 2023-05-18 | 2023-07-18 | 四川锦美环保股份有限公司 | Purifying method and treating system for tail gas containing asphalt smoke |
-
2023
- 2023-11-07 CN CN202311471519.3A patent/CN117205716B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102658975A (en) * | 2012-05-18 | 2012-09-12 | 北京燕山粉研精机有限公司 | High-pressure conveyed continuous powder body quantitative feeding device |
| CN104874269A (en) * | 2015-05-29 | 2015-09-02 | 山西大学 | System and method for synchronous implementation of online monitoring of mercury content in flue gas and mercury removal |
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| CN117205716B (en) | 2024-04-16 |
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