CN109173564B - Tail gas treatment method for asphalt mixing plant - Google Patents
Tail gas treatment method for asphalt mixing plant Download PDFInfo
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- CN109173564B CN109173564B CN201811376899.1A CN201811376899A CN109173564B CN 109173564 B CN109173564 B CN 109173564B CN 201811376899 A CN201811376899 A CN 201811376899A CN 109173564 B CN109173564 B CN 109173564B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/266—Drying gases or vapours by filtration
Abstract
A tail gas treatment method for an asphalt mixing plant comprises the following steps: (1) cooling the tail gas by a spray cooling device until liquid water drops are condensed from the tail gas; (2) sending the cooled tail gas into a demisting device to separate liquid water drops in the tail gas; (3) the tail gas after defogging is sent into exhaust apparatus and is heated to tail gas temperature and be higher than dew point temperature through steam in, then the atmosphere of discharging, this system adopts spray cooling device to produce tail gas moisture content with pitch mixing plant and reduces 70% -90%, and adopt the defroster to separate out the liquid water that condenses out, the tail gas that the cooling dehumidified mixes the intensification with the steam in the flue and discharges into the atmosphere, tail gas moisture content reduces and the temperature is higher than dew point temperature by a wide margin after system processing, before fully diffusing after discharging into the atmosphere, the temperature can not drop below dew point temperature, thereby no steam phenomenon forms.
Description
Technical Field
The invention belongs to the field of asphalt preparation, and particularly relates to a tail gas treatment method for an asphalt mixing plant.
Background
A large amount of waste gas with high temperature, dust and high moisture content can be formed in the drying process of aggregate in the asphalt mixing plant, and the existing treatment method of the waste gas is to directly discharge the waste gas into the atmosphere after dust removal. However, the temperature of the exhaust gas with high humidity drops sharply after encountering cold ambient air, and when the temperature of the exhaust gas drops below the dew point temperature, water vapor in the exhaust gas condenses into liquid water drops, which causes a water vapor phenomenon at the exhaust port, and the phenomenon is very easy to occur under the conditions of low ambient temperature and (or) high air humidity. Although the pollutants in the exhaust gas have reached emission standards, it is common for the general public to see that there is a white smoke region around the exhaust port, so that a large amount of water mist in the exhaust gas is mistaken for a large amount of pollutants, resulting in visual pollution of white mist, and the white mist reduces the visibility of the surrounding area, resulting in panic of nearby residents.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a tail gas treatment method for an asphalt mixing plant.
The invention adopts the following technical scheme:
a tail gas treatment method for an asphalt mixing plant comprises the following steps:
(1) cooling the tail gas by a spray cooling device until liquid water drops are condensed from the tail gas;
(2) sending the cooled tail gas into a demisting device to separate liquid water drops in the tail gas;
(3) and sending the demisted tail gas into a discharging device, heating the tail gas by hot gas until the temperature of the tail gas is higher than the dew point temperature, and then discharging the tail gas out of the atmosphere.
And further, the method comprises the step (4) of acquiring an image of an exhaust port of the exhaust device through the image acquisition device, and the control device analyzes and processes the image information fed back by the image acquisition device and controls the temperature reduction temperature of the tail gas in the spray cooling device and/or the temperature increase temperature of the tail gas in the exhaust device according to the processing result.
Furthermore, a first threshold value and a second threshold value are set in the control device, the control device analyzes the water and gas amount of the exhaust gas at the exhaust port according to the image information fed back by the image acquisition device and compares the water and gas amount with the first threshold value and the first threshold value, when the water amount is lower than the first threshold value, the control device controls the water treatment device to reduce the water supply amount to the spray cooling device and/or controls the hot gas supply device to reduce the hot gas supply amount to the discharge device, when the water vapor amount is higher than a second threshold value, the control device controls the water treatment device to increase the water supply amount to the spray cooling device and/or controls the hot gas supply device to increase the hot gas supply amount to the discharge device, when the water gas amount is between the first threshold value and the second threshold value, the control device controls the water treatment device to maintain the water supply amount to the spray cooling device and controls the hot gas supply device to maintain the hot gas supply amount to the discharge device.
Further, the temperature of the tail gas in the spray cooling device is reduced to 30-40 ℃.
Further, the temperature of the tail gas in the exhaust device is raised to 50-70 ℃.
Furthermore, the exhaust device comprises a flue, a heat insulation layer, a mixing assembly and a support, wherein the flue is supported on the ground through the support; the heat insulation layer is wrapped on the outer surface of the flue; the mixing component is arranged at the upper section of the flue and used for mixing the tail gas and the hot gas.
Further, the mixing assembly comprises a plurality of perforated plates which are distributed on the upper section of the flue in a staggered mode.
Further, the demisting device comprises a reservoir, a demister and a sewage pipeline, wherein the demister is connected with the discharging device and is used for separating liquid water drops in the cooled tail gas; the water storage tank is connected with the demister, and liquid water drops separated by the demister are collected; one end of the sewage pipeline is connected with the reservoir, and the other end of the sewage pipeline is connected with the water treatment device.
Furthermore, the defroster is the slope setting of height, and its upper end is connected with eduction gear, and the lower extreme is connected with the cistern, spray cooling device and be connected with the cistern through gas transmission pipeline.
Further, spray cooling device includes box and multiunit spray assembly, be provided with gas outlet and air inlet on the box, the bottom of box is provided with the storage water tank, and multiunit spray assembly interval staggered distribution is in the box, including the division board that sets up in the box, extends the branch water pipeline that sets up and sets up a plurality of nozzles of being connected with the water supply line on the division board along division board length.
As can be seen from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are:
the system adopts a spray cooling device to reduce the moisture content of tail gas generated by an asphalt mixing plant by 70-90 percent, adopts a demister to separate out condensed liquid water, discharges the cooled and dehumidified tail gas and hot gas in a flue after mixing and heating, greatly reduces the moisture content of the tail gas after being processed by the system, has the temperature higher than dew point temperature, and does not reduce the temperature below the dew point temperature before being fully diffused after being discharged into the atmosphere, thereby avoiding the formation of water vapor.
And an image acquisition device is arranged at the tail gas outlet to feed back the tail gas image information to the control device, and the control device analyzes and processes the image information fed back by the image acquisition device and controls the hot gas supply amount of the hot gas supply device to the discharge device and/or the water supply amount of the water treatment device to the spray cooling device according to the processing result so as to realize automatic control of the spray cooling device and the hot gas supply device and realize the purpose of automatic control.
Drawings
FIG. 1 is a schematic view of the structure of the tail gas treatment system of the present invention;
FIG. 2 is a flow diagram of a tail gas treatment process according to the present invention;
in the figure, 1-spray cooling device, 2-demisting device, 3-discharging device, 4-hot gas supply device, 5-control device, 6-image acquisition device, 7-water treatment device, 11-box, 111-gas inlet, 112-gas outlet, 113 water storage tank, 12-spray assembly, 121-separation plate, 122-water distribution pipeline, 123-nozzle, 124-total water supply pipeline, 125-wastewater recovery pipe, 21-demister, 22-reservoir, 23-gas transmission pipeline, 24-sewage pipeline, 31-flue, 311-gas outlet, 32-heat insulation layer, 33-mixing assembly and 34-support.
Detailed Description
The invention is further described below by means of specific embodiments.
Referring to fig. 1 to 2, a tail gas treatment system of an asphalt mixing plant comprises a spray cooling device 1, a demisting device 2, a discharge device 3, a hot gas supply device 4, a water treatment device 7, an image acquisition device 6 and a control device 5.
The spray cooling device 1 cools the entering tail gas to condense the tail gas into liquid water drops, and comprises a box body 11 and a plurality of groups of spray assemblies 12, wherein the box body 11 is provided with an air inlet 111 and an air outlet 112, the bottom of the box body 11 is provided with a water storage tank 113, waste water sprayed by the spray assemblies 12 is collected, the air inlet 111 is arranged on the side wall of the box body 11 and is positioned above the water storage tank 113, the air outlet 112 is arranged on the side wall of the box body 11, the spray assemblies 12 are distributed in the box body 11 in a staggered manner at intervals, and comprise a separation plate 121 arranged in the box body 11, a water distribution pipeline 122 arranged on the separation plate 121 and extending along the length of the separation plate 121, a plurality of nozzles 123 arranged on the separation plate 121 and connected with the water supply pipeline 122, a main water supply pipeline 124 with one end connected with the plurality of water distribution pipelines 122 and the other end connected with the water treatment device 7, and, the plurality of groups of spraying assemblies 12 are distributed in the box body 11 in a staggered mode at intervals, so that tail gas flows upwards in an S shape, the tail gas is fully contacted with cooling water sprayed by the nozzles 123, a better cooling effect is achieved, and further, the temperature of the tail gas is reduced to 30-40 ℃ in the spraying cooling device 1.
The demisting device 2 is connected with the spray cooling device 1, and is used for separating liquid water droplets in the cooled tail gas and comprises a demister 21, a reservoir 22, a sewage pipeline 24 and a gas transmission pipeline 23, wherein the demister 21 is arranged in a high-low inclined manner, the upper end of the demister is connected with the discharging device 3, and the lower end of the demister is connected with the reservoir 22; the reservoir 22 collects liquid water drops separated by the demister 21; one end of the sewage pipeline 24 is connected with the reservoir 22, the other end of the sewage pipeline is connected with the water treatment device 7, and liquid water collected by the reservoir 22 is sent into the water treatment device 7 to be treated; one end of the gas transmission pipeline 23 is connected with the gas outlet 112 of the spray cooling zone device 1, the other end is connected with the top of the water storage pool 22, and the cooled tail gas is introduced into the demister 21 for treatment.
The exhaust device 3 is connected with the demister 21, heats the entering tail gas until the temperature of the tail gas is higher than the dew point temperature, and then exhausts the tail gas into the atmosphere, and comprises a flue 31, a heat insulation layer 32, a mixing group 33 and a support 34, wherein the flue 31 is supported on the ground through the support 34, and the top of the flue is provided with an exhaust port 311; insulation 32 is wrapped around the outer surface of flue 31 to reduce heat loss from flue 31; the mixing component 33 is arranged at the upper section of the flue 31 and mixes the tail gas and the hot gas, the mixing component 33 comprises a plurality of porous plates which are distributed on the upper section of the flue 31 in a staggered way, and particularly, the temperature of the tail gas is raised to 50-70 ℃ in the exhaust device 3.
The hot gas supply device 4 is connected to a lower section of the flue 31 to supply hot gas to the flue 31, and specifically, the hot gas supply device 4 may be a burner or other device capable of supplying hot gas.
The pool treatment device 7 is respectively connected with the water storage tank 113 and the reservoir 22, and recovers the waste water from the water storage tank 113 and the liquid water collected in the reservoir 22 and supplies the treated water to the spray cooling device 1 for spraying.
The image acquisition device 6 is arranged at the air outlet 311, acquires an image at the air outlet 311 and feeds the image back to the control device 5, and the image acquisition device 6 comprises a camera.
The control device 5 is connected with the image acquisition device 6, the hot gas supply device 4 and the water treatment device 7, the control device 5 analyzes and processes the image information fed back by the image acquisition device 6 and controls the temperature reduction of the tail gas in the spray cooling device 1 and/or the temperature rise of the tail gas in the exhaust device 3 according to the processing result, the control device 5 comprises a single chip microcomputer, a Micro Control Unit (MCU) or a Digital Signal Processor (DSP), concretely, the control device 5 controls the hot gas supply amount of the hot gas supply device 4 to the exhaust device 3 and/or the water supply amount of the water treatment device 7 to the spray cooling device 1 according to the processing result, further, a first threshold value and a second threshold value are set in the control device 5, the control device 5 analyzes the water gas amount of the tail gas at the exhaust port 311 according to the image information fed back by the image acquisition device 6 and compares the water gas amount with the first threshold value and the first threshold value, when the water gas, the control device 5 controls the water treatment device 7 to reduce the water supply amount to the spray cooling device 1 and/or controls the hot air supply device 4 to reduce the hot air supply amount to the discharge device 3; when the water vapor amount is higher than the second threshold value, the control device 5 controls the water treatment device 7 to increase the water supply amount to the spray cooling device 1 and/or controls the hot gas supply device 4 to increase the hot gas supply amount to the discharge device 3; when the amount of the water gas is between the first threshold value and the second threshold value, the control device 5 controls the water treatment device 7 to maintain the amount of the water supplied to the spray cooling device 1 and controls the hot gas supply device 4 to maintain the amount of the hot gas supplied to the exhaust device 3.
A tail gas treatment method for an asphalt mixing plant comprises the following steps:
(1) tail gas generated by the asphalt mixing plant enters the spray cooling device 1 from the gas inlet 111, cooling water sprayed out by the nozzle 123 is fully mixed with the tail gas, liquid water drops are condensed out by cooling the tail gas, and waste water mixed with the tail gas is collected by the water storage tank 113;
(2) the cooled tail gas is processed in a demister 21 through a gas transmission pipeline 23, the demister 21 separates out liquid water droplets in the tail gas, and a reservoir 22 collects the liquid water droplets separated by the demister 21;
(3) the demisted tail gas enters the flue 31, is mixed with hot gas through the mixing component 33 in the rising process and is heated until the temperature of the tail gas is higher than the dew point temperature, and then is exhausted into the atmosphere through the exhaust port 311;
(4) the image acquisition device 6 acquires an image of the exhaust port 311 and feeds the image back to the control device 5, a first threshold value and a second threshold value are set in the control device 5, the control device 5 analyzes the water and gas amount of the exhaust gas of the exhaust port 311 according to the image, compares the water and gas amount with the first threshold value and the first threshold value, when the water and gas amount is lower than the first threshold value, the temperature of the exhaust gas is far higher than the dew point temperature, and the control device 5 controls the water treatment device 7 to reduce the water supply amount to the spray cooling device 1 and/or controls the hot gas supply device 4 to reduce the hot gas supply amount to the exhaust device 3; when the water content is higher than a second threshold value, which indicates that the temperature of the tail gas is lower than the dew point temperature, the control device 5 controls the water treatment device 7 to increase the water supply amount to the spray cooling device 1 and/or controls the hot gas supply device 4 to increase the hot gas supply amount to the exhaust device 3; when the amount of the water gas is between the first threshold value and the second threshold value, the control device 5 controls the water treatment device 7 to maintain the amount of the water supplied to the spray cooling device 1 and controls the hot gas supply device 4 to maintain the amount of the hot gas supplied to the exhaust device 3.
This system adopts spray cooling device 1 to produce tail gas moisture content reduction 70% -90% with pitch mixing plant to adopt defroster 21 to separate out the liquid water that condenses out, the tail gas that the cooling dehumidified mixes the intensification with hot-gas in flue 31 and discharges into the atmosphere, be provided with image acquisition device 6 at gas vent 311 and feed back tail gas image information to controlling means 5, in order to realize automatic control water treatment facilities 7 and hot gas supply unit 4, tail gas moisture content reduction and temperature are higher than dew point temperature by a wide margin after the system processing, before fully diffusing after discharging into the atmosphere, the temperature can not drop below dew point temperature, thereby no steam phenomenon forms.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents and modifications within the scope of the description.
Claims (6)
1. The tail gas treatment method for the asphalt mixing plant is characterized by comprising the following steps: the method comprises the following steps:
(1) cooling the tail gas by a spray cooling device until liquid water drops are condensed from the tail gas;
(2) sending the cooled tail gas into a demisting device to separate liquid water drops in the tail gas;
(3) feeding the demisted tail gas into a discharging device, heating the tail gas by hot gas until the temperature of the tail gas is higher than the dew point temperature, and then discharging the tail gas out of the atmosphere;
the method also comprises the step (4) of acquiring images of the exhaust port of the exhaust device through the image acquisition device, and controlling the temperature reduction temperature of the tail gas in the spray cooling device and/or the temperature rise temperature of the tail gas in the exhaust device by the control device according to the processing result by analyzing and processing the image information fed back by the image acquisition device;
the control device is provided with a first threshold value and a second threshold value, analyzes the moisture content of the exhaust gas at the exhaust port according to the image information fed back by the image acquisition device and compares the moisture content with the first threshold value and the second threshold value, when the water amount is lower than the first threshold value, the control device controls the water treatment device to reduce the water supply amount to the spray cooling device and/or controls the hot gas supply device to reduce the hot gas supply amount to the discharge device, when the water vapor amount is higher than a second threshold value, the control device controls the water treatment device to increase the water supply amount to the spray cooling device and/or controls the hot gas supply device to increase the hot gas supply amount to the discharge device, when the water and gas amount is between the first threshold value and the second threshold value, the control device controls the water treatment device to keep the water supply amount to the spray cooling device and controls the hot gas supply device to keep the hot gas supply amount to the discharge device;
the exhaust device comprises a flue, a heat insulation layer, a mixing assembly and a support, wherein the flue is supported on the ground through the support; the heat insulation layer is wrapped on the outer surface of the flue; the mixing assembly is arranged at the upper section of the flue and used for mixing tail gas and hot gas, and the mixing assembly comprises a plurality of porous plates which are distributed on the upper section of the flue in a staggered mode.
2. The asphalt mixing plant tail gas treatment method according to claim 1, characterized in that: and cooling the tail gas in the spray cooling device to 30-40 ℃.
3. The asphalt mixing plant tail gas treatment method according to claim 1, characterized in that: and heating the tail gas in the exhaust device to 50-70 ℃.
4. The asphalt mixing plant tail gas treatment method according to claim 1, characterized in that; the demisting device comprises a reservoir, a demister and a sewage pipeline, the demister is connected with the discharging device, and liquid water drops in the cooled tail gas are separated; the water storage tank is connected with the demister, and liquid water drops separated by the demister are collected; one end of the sewage pipeline is connected with the reservoir, and the other end of the sewage pipeline is connected with the water treatment device.
5. The asphalt mixing plant tail gas treatment method according to claim 4, characterized in that: the demister is arranged in a high-low inclined mode, the upper end of the demister is connected with the discharging device, the lower end of the demister is connected with the water storage tank, and the spraying cooling device is connected with the water storage tank through the gas transmission pipeline.
6. The asphalt mixing plant tail gas treatment method according to claim 1, characterized in that: the spraying and cooling device comprises a box body and a plurality of groups of spraying assemblies, wherein a gas outlet and a gas inlet are formed in the box body, a water storage tank is arranged at the bottom of the box body, the groups of spraying assemblies are distributed in the box body in a staggered mode at intervals, and comprise partition plates arranged in the box body, water distribution pipelines arranged along the length of the partition plates in an extending mode and a plurality of nozzles arranged on the partition plates and connected with water supply pipelines.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811376899.1A CN109173564B (en) | 2018-11-19 | 2018-11-19 | Tail gas treatment method for asphalt mixing plant |
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| CN201811376899.1A CN109173564B (en) | 2018-11-19 | 2018-11-19 | Tail gas treatment method for asphalt mixing plant |
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| CN109173564A CN109173564A (en) | 2019-01-11 |
| CN109173564B true CN109173564B (en) | 2020-07-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201811262U (en) * | 2010-09-27 | 2011-04-27 | 洛阳市天誉环保工程有限公司 | Tail gas dehumidification device for wet-process flue gas purification |
| JP5836049B2 (en) * | 2011-10-14 | 2015-12-24 | 三菱重工環境・化学エンジニアリング株式会社 | White smoke prevention method and apparatus for realizing the same |
| JP6296802B2 (en) * | 2014-01-22 | 2018-03-20 | 株式会社大川原製作所 | Gas treatment system |
| CN105498431B (en) * | 2016-01-29 | 2017-06-27 | 大连科林能源工程技术开发有限公司 | A kind of wood fibre drying device tail gas environment-friendly disposal system |
| CN108067085A (en) * | 2016-11-09 | 2018-05-25 | 湖北鑫固久技术装备有限公司 | A kind of coal chemical industry exhaust gas treating method and device |
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Address after: 362000 Fujian province Quanzhou Fengze District High-tech Industrial Park Sports Street No. 700 Applicant after: Fujian Nanfang pavement machinery Co., Ltd Address before: 362000 Fujian province Quanzhou Fengze District High-tech Industrial Park Sports Street No. 700 Applicant before: FUJIAN SOUTH HIGHWAY MACHINERY Co.,Ltd. |
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