CN116440687A - Purifying method and treating system for tail gas containing asphalt smoke - Google Patents
Purifying method and treating system for tail gas containing asphalt smoke Download PDFInfo
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- CN116440687A CN116440687A CN202310564292.0A CN202310564292A CN116440687A CN 116440687 A CN116440687 A CN 116440687A CN 202310564292 A CN202310564292 A CN 202310564292A CN 116440687 A CN116440687 A CN 116440687A
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- flue gas
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- asphalt
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- 239000010426 asphalt Substances 0.000 title claims abstract description 63
- 239000000779 smoke Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000000843 powder Substances 0.000 claims abstract description 164
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 103
- 239000003546 flue gas Substances 0.000 claims abstract description 103
- 238000002156 mixing Methods 0.000 claims abstract description 59
- 238000005507 spraying Methods 0.000 claims abstract description 59
- 239000000428 dust Substances 0.000 claims abstract description 51
- 239000007789 gas Substances 0.000 claims abstract description 15
- 239000007787 solid Substances 0.000 claims description 42
- 238000005303 weighing Methods 0.000 claims description 27
- 239000012716 precipitator Substances 0.000 claims description 26
- 230000007246 mechanism Effects 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 20
- 238000006477 desulfuration reaction Methods 0.000 claims description 19
- 230000023556 desulfurization Effects 0.000 claims description 19
- 238000001914 filtration Methods 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 15
- 239000004744 fabric Substances 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 11
- 238000000746 purification Methods 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 9
- 239000003517 fume Substances 0.000 claims description 8
- 238000007689 inspection Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 241000973497 Siphonognathus argyrophanes Species 0.000 claims description 2
- 239000000443 aerosol Substances 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 29
- 239000002912 waste gas Substances 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 8
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000012719 wet electrostatic precipitator Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 229940098458 powder spray Drugs 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
- B01D51/10—Conditioning the gas to be cleaned
-
- 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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/06—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 adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
- B01D53/10—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 adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds with dispersed adsorbents
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/16—Plant or installations having external electricity supply wet type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D2017/009—Cyclone for separating fines from gas
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Dispersion Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Road Paving Machines (AREA)
Abstract
The utility model discloses a purifying method and a treating system for tail gas containing asphalt smoke, belonging to the technical field of waste gas treatment equipment. The processing system is simple in structure, only one powder spraying adsorption point is arranged, so that the management difficulty is greatly reduced, the power of the main fan is also reduced, the pipe diameter of the mixing bin is consistent with that of the main flue gas pipe, the resistance cannot be increased, the main flue gas pipe is not easy to be blocked, and the bag-pasting phenomenon of the bag-type dust collector is not easy to occur.
Description
Technical Field
The utility model belongs to the technical field of waste gas treatment equipment, and particularly relates to a method and a system for purifying asphalt-containing smoke tail gas.
Background
The cathode carbon block for aluminum is prepared by taking calcined anthracite, graphite powder and the like as aggregate and asphalt as a binder, and is mainly used for the carbon lining of the aluminum electrolysis cell. The carbon material is processed, built or rammed to form the main body of the bottom and side wall of the aluminum cell, and is used for holding electrolyte and produced aluminum liquid required by the aluminum electrolytic reaction and guiding current out of the cell through a steel rod embedded in the cathode.
The main working procedures of asphalt storage and transportation, kneading and forming, primary roasting (ring type furnace), high-pressure dipping and secondary roasting (ring type furnace and tunnel kiln) are adopted in the electrode production process.
The flue gas generated by one-time roasting of the electrode covered ring type roasting furnace mainly contains asphalt smoke, particulate matters, sulfur dioxide and nitrogen oxides. Compared with anode roasting for aluminum, the method has the advantages of long roasting period, small flue gas quantity, low flue gas temperature, high asphalt smoke concentration and low concentration of nitrogen oxides and sulfur dioxide.
The tar precipitator is generally used for purifying asphalt smoke in roasting smoke in domestic carbon industry, but with the improvement of the special emission limit of atmospheric pollutants, if a single tar precipitator purifying measure is adopted, even if a plurality of stages are connected in series, the tar smoke can not be stably purified for a long time, and high efficiency purifying efficiency can not be maintained.
The electrical tar precipitator has the characteristics of low efficiency, unstable operation and liquid waste tar (dangerous waste) generation in purifying asphalt smoke, so that most enterprises in the industry cannot discharge the asphalt smoke up to the standard. According to the basic theory and design principle of the industrial control equipment for gaseous pollutants, four basic methods of general conventional waste gas purification treatment are available, namely an absorption method, an adsorption method, a chemical reaction method (including an incineration method) and a high-altitude dilution discharge method.
The adsorption method adopted by a plurality of enterprises at present has the following problems: (1) The number of adsorption points is large, the total jet air flow is large, the air quantity of a main fan of a process system is increased, the negative pressure is increased, and the power of a fan shaft is increased; meanwhile, the power of a feeding system and a conveying system for adsorbing powder at multiple points is increased; the operation and management difficulty of workers is also increased; the more points there are for the shop environment, the more leaks and faults are; (2) Some of the main fans are mixed by means of a reducing pipe and a diverging pipe, so that the wind pressure of a main fan of a process system is increased to be disturbed, and the power of a fan shaft is increased; if the powder enters by the negative pressure of the system, the mixing is possibly uneven; the pipeline is locally reduced, so that the running resistance of the pipeline is mainly increased, the negative pressure of a main fan of a process system is increased, and the power of a fan shaft is increased; the black method adsorption device has the advantages that the flow rate of gas in the pipeline is fast after the local part of the pipeline is small, the contact time of asphalt smoke and adsorption powder is short, and the adsorption is insufficient. (3) asphalt fume collecting pipe is blocked. (4) the bag pasting phenomenon occurs in the dust remover cloth bag.
Disclosure of Invention
The utility model aims to provide a purifying method for asphalt-containing smoke tail gas, which has the advantages of simple process and convenient operation and can better improve the problems.
The utility model aims to provide a treatment system for asphalt-containing smoke tail gas, which is simple in structure, and only one powder spraying adsorption point is arranged, so that the management difficulty is greatly reduced, and the power of a main fan is also reduced.
The embodiment of the utility model is realized in the following way:
the embodiment of the utility model provides a method for purifying asphalt smoke, which comprises the following steps:
s1: delivering the flue gas generated in the roasting workshop into a cooling tower for cooling treatment, so that the temperature of the flue gas is reduced to 60-70 ℃;
s2: delivering the cooled flue gas to an electric tar precipitator for primary purification;
s3: delivering the flue gas purified by the electrical tar precipitator to a gas-solid mixing bin, mixing the flue gas and solid powder in the gas-solid mixing bin for 2-3 seconds, and fully adsorbing asphalt smoke by the solid powder to realize secondary purification;
s4: the flue gas after secondary purification and the solid powder absorbed with the asphalt flue gas are conveyed into a cyclone separator for primary gas-solid separation, and the separation efficiency of the cyclone separator is 80-90%;
s5: the flue gas treated by the cyclone separator is conveyed to a bag-type dust remover for secondary gas-solid separation;
s6: delivering the flue gas filtered by the bag-type dust collector to an alkaline washing desulfurization tower for desulfurization treatment, SO that SO in the flue gas 2 The concentration is lower than 35mg/m 3 ；
S7: the desulfurized flue gas is subjected to wet electric dust collector to remove tiny dust and aerosol, then is conveyed to a chimney through a main fan, and is discharged to the atmosphere through the chimney.
In the step S2, the temperature of the inlet smoke of the electric tar precipitator is 60-70 ℃, the temperature of the outlet smoke is 50-60 ℃, and the efficiency of removing asphalt smoke is 70-80%.
Further, in the step S3, the mesh number of the solid powder is 200-300 meshes, the solid powder is sprayed into the gas-solid mixing bin through an automatic powder spraying device, so that the solid powder is forcedly mixed with the flue gas, and the adding amount of the automatic powder spraying device is 20-30 kg/m.
Further, in the step S3, the change of the airflow velocity of the air inlet end and the air outlet end of the gas-solid mixing bin is less than 1m/S; in the step S4, the flow velocity of the inlet of the cyclone separator is 16-22 m/S, the separation efficiency of the cyclone separator is 80-90%, and the concentration of particles in the flue gas at the outlet end of the cyclone separator is less than 100g/m 3 。
Further, in the step S5, the filtering wind speed of the bag-type dust collector is less than or equal to 0.7m/min, and the concentration of particles in the flue gas at the outlet end of the bag-type dust collector is less than 10mg/m 3 The concentration of asphalt smoke is smallAt 20mg/m 3 。
The embodiment of the utility model also provides a treatment system for the tail gas containing asphalt smoke, which comprises a roasting furnace, a cooling tower, an electric tar precipitator, a mixing bin, a cyclone separator, a cloth bag dust remover, a wet desulfurization dust removal combined tower, a main fan and a chimney which are sequentially communicated through a smoke main pipe, wherein the mixing bin is made of round pipes, the pipe diameter of the mixing bin is the same as the pipe diameter of the smoke main pipe, and the treatment system further comprises a powder spraying device, and the powder spraying device is communicated with the mixing bin through a powder spraying pipe.
Further, the powder spraying device comprises a frame body, a powder bin, a weighing mechanism and a powder spraying mechanism, wherein the powder bin is arranged on the frame body, a blanking port is formed in the lower end of the powder bin, a first blanking valve is arranged at the blanking port, the weighing mechanism is arranged on the frame body and located below the blanking port of the powder bin, the powder spraying mechanism comprises a blower and a feeder, the air outlet end of the blower is communicated with one end of a powder spraying pipe, the upper end of the feeder is connected with the weighing mechanism, the lower end of the feeder is communicated with the side wall of the powder spraying pipe, which is close to one end of the blower, and one end of the powder spraying pipe, which is far away from the blower, is provided with a powder spraying gun which extends to the mixing bin.
Further, the weighing mechanism comprises a weighing bin and an online metering scale, the weighing bin is located below a blanking port of the powder bin, the online metering scale is arranged at the lower end of the weighing bin, and the upper end of the feeder penetrates into the weighing bin from the bottom of the weighing bin; the outer side wall of the powder bin is provided with a vibrator and a material level monitor.
Further, feed mechanism still is equipped with in the top of powder storehouse, feed mechanism includes storage box, filtration storehouse and vacuum pump, filtration storehouse set up in on the support body and be located the top of powder storehouse, the blanking mouth of filtration storehouse with the feed inlet of powder storehouse passes through the unloading pipe intercommunication just be equipped with the second unloading valve on the unloading pipe, the storage box with the filtration storehouse passes through the conveying pipe intercommunication, the vacuum pump with the filtration storehouse passes through the evacuation tube intercommunication, be equipped with the filter between the conveying pipe mouth of pipe and the evacuation tube mouth of pipe in the filtration storehouse.
Further, inspection manholes are formed in a smoke main pipe between the roasting furnace and the cooling tower, a smoke main pipe between the electric tar precipitator and the mixing bin, and a smoke main pipe between the mixing bin and the cyclone separator.
The beneficial effects of the utility model are as follows:
the purifying method of the asphalt-containing smoke tail gas provided by the embodiment of the utility model has the advantages of simple process and convenient operation. The adsorption powder is adopted to carry out forced mixed flow powder spraying at the position of the waste gas main pipe, so that the waste gas is forced to contact with the adsorption powder, and the contact specific surface area of the adsorption powder and the asphalt smoke is increased by controlling the proportion of the compressed air and the adsorption powder to carry out forced mixed flow, so that the mixing speed is high, and the mixing is uniform. And the compressed air is used for forced mixed flow, so that the consumption of the compressed air is small, the pipe diameter does not need to be expanded and contracted when the compressed air enters the mixing pipe, and the pressure of a system fan cannot be increased. The automatic powder spraying device is automatic in feeding and feeding, the device is fully sealed, secondary pollution is avoided, and the consumption of the adsorption powder can be adjusted according to the production load. The adsorption powder is only required to adopt the production raw materials formed by mixing , the mesh number is 200-300, the adsorption powder is easy to obtain, no special preparation is required, and the adsorbed asphalt-containing powder is returned to a mixing forming workshop to be continuously used as the production raw materials. The cyclone separator mainly collects a part of large particle groups (asphalt-containing powder) formed after the adsorption powder is contacted with asphalt smoke in advance, and reduces the dust collection pressure of the rear-end bag-type dust collector. The cost is low, because the production raw powder is adopted as the adsorption powder, the adsorbed asphalt-containing powder is returned to be used as the production raw material, and the cost is greatly saved.
The treatment system for the asphalt-containing smoke tail gas provided by the embodiment of the utility model has the advantages that the structure is simple, only one powder spraying adsorption point is arranged, the management difficulty is greatly reduced, the power of a main fan is also reduced, the pipe diameter of a mixing bin is consistent with that of a smoke main pipe, the resistance is not increased, the smoke main pipe is not easy to block and match, and a bag pasting phenomenon is not easy to occur in a bag-type dust collector.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a treatment system for bituminous fume according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of another view of a treatment system for bituminous fume according to an embodiment of the present utility model;
FIG. 3 is a schematic structural view of a powder spraying device;
in the figure: 11-roasting furnace; 12-a cooling tower; 13-an electrical tar precipitator; 14-a mixing bin; 15-a cyclone separator; 16-a bag-type dust remover; 17-wet desulfurization and dust removal combined tower; 18-a main fan; 19-chimney; 20-smoke main pipe; 21-inspection manhole; 30-a powder spraying device; 31-a frame body; 32-a powder bin; 321-a first blanking valve; 322-level monitor; 323-a vibrator; 33, a weighing mechanism; 331-weighing a stock bin; 332-online metering; 34-a powder spraying mechanism; 341-a blower; 342-feeder; 343-powder spraying pipe; 344-powder spray gun; 35-a feeding mechanism; 351—a storage bin; 352-filtration bin; 353-vacuum pump; 354-a second blanking valve; 355-feeding pipe; 356-evacuating the tube; 357-filter.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
In addition, the embodiments of the present utility model and the features of the embodiments may be combined with each other without collision.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present utility model, it should be noted that, the azimuth or positional relationship indicated by the terms "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship conventionally put in place when the inventive product is used, or the azimuth or positional relationship conventionally understood by those skilled in the art, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the two components can be mechanically connected, can be directly connected or can be indirectly connected through an intermediate medium, and can be communicated with each other. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Example 1
The first embodiment of the utility model provides a method for purifying asphalt-containing smoke tail gas, which comprises the following steps:
s1: delivering the flue gas generated in the roasting workshop into a cooling tower for cooling treatment, so that the temperature of the flue gas is reduced to 60-70 ℃ from about 130-140 ℃; and the cooling tower can also remove about 5% of asphalt smoke.
In this example, the concentration of the asphaltenic smoke fed from the baking shop was about 200 mg/m.
S2: and conveying the cooled flue gas to an electric tar precipitator for primary purification. The temperature of the inlet flue gas of the electrical tar precipitator is 60-70 ℃ and the temperature of the outlet flue gas is 50-60 ℃. The electric tar precipitator can remove 70-80% of asphalt smoke in the smoke, and mainly purify asphalt smoke with the particle size of more than 1.0 mu m, and the concentration of the purified asphalt smoke is 40-60 mg/m.
S3: and (3) conveying the flue gas purified by the electrical tar precipitator to a gas-solid mixing bin, mixing the flue gas and solid powder in the gas-solid mixing bin for 2-3 seconds, and fully adsorbing asphalt smoke by the solid powder to realize secondary purification.
In the step, the mesh number of the solid powder is 200-300 meshes, the solid powder is sprayed into a gas-solid mixing bin through an automatic powder spraying device, a quick-mounting mechanical mixer is arranged on an outlet pipeline of the automatic powder spraying device, the solid powder and the flue gas are forcedly mixed through the mechanical mixer, the solid powder and the flue gas are uniformly mixed, and the adding amount of the automatic powder spraying device is 20-30 kg/m. The solid powder can catch most of asphalt smoke in the gas-solid mixing bin, and can be continuously caught in the flowing process of the following working procedure, so that the asphalt smoke can be completely purified. The solid powder mainly absorbs asphalt fume with the grain diameter of 0.1-1.0 mu m.
In the step, the change of the airflow velocity of the air inlet end and the air outlet end of the gas-solid mixing bin is less than 1m/s.
S4: and conveying the secondarily purified flue gas and the solid powder adsorbed with the asphalt flue gas into a cyclone separator for primary gas-solid separation. The cyclone inlet flow rate is 16-22 m/s, in this example 19.8m/s. The cyclone separator can separate about 80-90% of solid powder, and the concentration of particles in the flue gas at the outlet end of the cyclone separator is less than 100g/m 3 。
S5: the flue gas treated by the cyclone separator is conveyed to a bag-type dust remover for secondary gas-solid separation; the filtering wind speed of the bag-type dust collector is less than or equal to 0.7m/min.
A part of small particle groups or adsorption powder separated from the cyclone separator continuously forms particle groups with the uncaptured asphalt smoke in the flowing process of the smoke, the particle groups are attached to a cloth bag of the cloth bag dust remover, and the particle groups are attached by pulse vibrationThe dust particle clusters stuck on the cloth bags are beaten and fall into the hopper, so that the adsorption powder is collected through automatic discharging. The concentration of particles in the flue gas at the outlet end of the bag-type dust collector is less than 10mg/m 3 The concentration of asphalt smoke is less than 20mg/m 3 。
S6: delivering the flue gas filtered by the bag-type dust collector to an alkaline washing desulfurization tower for desulfurization treatment; the sulfur dioxide in the flue gas can be changed into sulfite after the flue gas is subjected to alkali washing, SO that SO in the flue gas 2 The concentration is lower than 35mg/m 3 。
S7: the flue gas after desulfurization gets rid of tiny dust and aerial fog through wet electrostatic precipitator, wet electrostatic precipitator's main action is getting rid of because of the water smoke of desulfurization flue gas in the flue gas, if have the dust to escape because of the sack dust removal simultaneously, gets rid of the dust in the flue gas, ensures that the flue gas emission reaches the standard, and the flue gas after the processing is carried to the chimney through main fan, then discharges into the atmosphere through the chimney.
The method for purifying the asphalt-containing smoke tail gas provided by the embodiment of the utility model has the following advantages:
(1) The adsorption powder is adopted to carry out forced mixed flow powder spraying at the position of the waste gas main pipe, so that the waste gas is forced to contact with the adsorption powder, and the contact specific surface area of the adsorption powder and the asphalt smoke is increased by controlling the proportion of the compressed air and the adsorption powder to carry out forced mixed flow, so that the mixing speed is high, and the mixing is uniform. And the compressed air is used for forced mixed flow, so that the consumption of the compressed air is small, the pipe diameter does not need to be expanded and contracted when the compressed air enters the mixing pipe, and the pressure of a system fan cannot be increased.
(2) The automatic powder spraying device is automatic in feeding and feeding, the device is fully sealed, secondary pollution is avoided, and the consumption of the adsorption powder can be adjusted according to the production load.
(3) The adsorption powder is only required to adopt the production raw materials formed by mixing , the mesh number is 200-300, the adsorption powder is easy to obtain, no special preparation is required, and the adsorbed asphalt-containing powder is returned to a mixing forming workshop to be continuously used as the production raw materials.
(4) The cyclone separator mainly collects a part of large particle groups (asphalt-containing powder) formed after the adsorption powder is contacted with asphalt smoke in advance, and reduces the dust collection pressure of the rear-end bag-type dust collector.
(5) The cost is low, because the production raw powder is adopted as the adsorption powder, the adsorbed asphalt-containing powder is returned to be used as the production raw material, and the cost is greatly saved.
Example 2
Referring to fig. 1 and 2, a second embodiment of the present utility model provides a treatment system for tail gas containing asphalt smoke, which includes a roasting furnace 11, a cooling tower 12, an electrical tar precipitator 13, a mixing bin 14, a powder spraying device 30, a cyclone separator 15, a bag-type dust collector 16, a wet desulfurization and dust removal combined tower 17, a main fan 18 and a chimney 19.
The exhaust port of the roasting furnace 11 is communicated with the air inlet of the cooling tower 12 through a main flue gas pipe 20, the exhaust port of the cooling tower 12 is communicated with the air inlet of the electric tar precipitator 13 through a main flue gas pipe 20, the exhaust port of the electric tar precipitator 13 is communicated with the air inlet end of the mixing bin 14 through a main flue gas pipe 20, the air outlet end of the mixing bin 14 is communicated with the air inlet of the cyclone separator 15 through a main flue gas pipe 20, the air outlet of the cyclone separator 15 is communicated with the air inlet of the bag dust collector 16 through a main flue gas pipe 20, the exhaust port of the bag dust collector 16 is communicated with the air inlet of the wet desulfurization dust collection combined tower 17 through a main flue gas pipe 20, the exhaust port of the wet desulfurization dust collection combined tower 17 is communicated with the air inlet of the main fan 18 through a main flue gas pipe 20, and the exhaust port of the main fan 18 is communicated with the air inlet of the chimney 19 through a main flue gas pipe 20.
In this embodiment, the mixing bin 14 is made of a circular tube, and the tube diameter of the mixing bin 14 is the same as the tube diameter of the main flue gas tube 20. This does not increase the resistance of the duct nor does it increase the pressure of the main blower 18 of the system.
Inspection manholes 21 are formed in the main flue gas pipe 20 between the roasting furnace 11 and the cooling tower 12, the main flue gas pipe 20 between the electric tar precipitator 13 and the mixing bin 14 and the main flue gas pipe 20 between the mixing bin 14 and the cyclone separator 15, so that the inside of the main flue gas pipe 20 is convenient to overhaul.
A water tank is further arranged on one side of the cooling tower 12, and the cooling tower 12 is communicated with the water tank through a water pipe.
The bag house 16 may be provided in a plurality of parallel arrangements.
The asphaltic smoke treatment system also includes a powder spraying device 30. Referring to fig. 3, the powder spraying device 30 includes a frame 31, a powder bin 32, a weighing mechanism 33, and a powder spraying mechanism 34.
The frame 31 plays a role of supporting other components, and the frame 31 is a frame structure.
The powder bin 32 is arranged on the frame 31, and the lower half part of the powder bin 32 is of a conical structure. The top of powder storehouse 32 is equipped with the feed inlet, can add the material in to powder storehouse 32 through the feed inlet, and the bottom of powder storehouse 32 is equipped with the blanking mouth, and blanking mouth department is equipped with first unloading valve 321, opens first unloading valve 321, and the material in the powder storehouse 32 just can follow the blanking mouth and flow.
The side wall of the powder bin 32 is provided with the material level monitor 322, so that the amount of materials in the powder bin 32 can be conveniently monitored, the material level monitor 322 is at least two, at least one is arranged on the side wall of the lower end conical structure of the powder bin 32, and at least one is also arranged on the side wall of the upper end of the powder bin 32.
The outer side wall of the powder bin 32 is also provided with a vibrator 323, and one, two or more vibrators 323 can be arranged. The vibrator 323 is arranged on the outer side wall of the conical structure part of the powder storage bin 32, and the setting of the vibrator 323 can better ensure that the materials in the powder storage bin 32 can fall from the blanking port.
The weighing mechanism 33 includes a weighing bin 331 and an online meter 332. The scale bin 331 is disposed on the frame 31 and below the blanking port of the powder bin 32, and the online metering scale 332 is disposed at the lower end of the scale bin 331, where the online metering scale 332 is used for weighing the material falling into the scale bin 331.
The powder spraying mechanism 34 comprises a blower 341, a feeder 342, a powder spraying pipe 343 and a powder spraying gun 344, wherein the air outlet end of the blower 341 is communicated with one end of the powder spraying pipe 343, the upper end of the feeder 342 penetrates into the weighing bin 331 from the bottom of the weighing bin 331, the lower end of the feeder 342 is communicated with the side wall of the powder spraying pipe 343, which is close to one end of the blower 341, the powder spraying gun 344 is arranged at one end of the powder spraying pipe 343, which is far away from the blower 341, and extends into the mixing bin 14, the powder spraying gun 344 is obliquely arranged towards the air flow direction in the mixing bin 14, and an included angle formed between the spraying direction of the powder spraying gun 344 and the axis of the mixing bin 14 is 45 degrees. In this embodiment, the feeder 342 is a screw feeder 342. The blower 341 is a Roots blower. In operation, the feeder 342 conveys powder in the weighing bin 331 to the powder spraying pipe 343, and then the air blower 341 blows out the powder from the powder spraying gun 344 through the powder spraying pipe 343, so that the powder is sprayed into the mixing bin 14 to adsorb and purify asphalt smoke.
A feeding mechanism 35 is also arranged above the powder bin 32. The feeding mechanism 35 comprises a storage tank 351, a filter bin 352 and a vacuum pump 353, wherein the filter bin 352 is arranged on the frame body 31 and is positioned above the powder bin 32, the lower half part of the filter bin 352 is of a conical structure, a blanking port is arranged at the lower end of the lower half part of the filter bin 352, the blanking port of the filter bin 352 is communicated with the feeding port of the powder bin 32 through a blanking pipe, a second blanking valve 354 is arranged on the blanking pipe, the storage tank 351 is communicated with the filter bin 352 through a feeding pipe 355, the vacuum pump 353 is communicated with the filter bin 352 through a vacuumizing pipe 356, and a filter 357 is arranged between a pipe orifice of the feeding pipe 355 in the filter bin 352 and a pipe orifice of the vacuumizing pipe 356. The filter 357 may be a cloth bag filter or other gas-solid filter. During operation, vacuum pump 353 vacuumizes filter bin 352 to make the powder in storage tank 351 get into filter bin 352 along conveying pipe 355, and the sack filter can guarantee that the powder is filtered and remains in filter bin 352, then second baiting valve 354 opens, and the powder in filter bin 352 will fall into powder bin 32, thereby realizes automatic interpolation powder. Not only improves the efficiency, but also greatly reduces the labor intensity.
The working principle of the treatment system for the asphalt-containing smoke tail gas provided by the embodiment of the utility model is as follows:
the flue gas generated by the roasting furnace 11 is conveyed into the cooling tower 12 for cooling treatment, the temperature is reduced to 60-70 ℃, meanwhile, about 5% of asphalt smoke content can be removed, then the flue gas with reduced temperature flows into the electric tar precipitator 13 along the flue gas main pipe 20 for primary purification under the action of the main fan 18, about 70-80% of asphalt smoke content can be removed by the electric tar precipitator 13, the flue gas treated by the electric tar precipitator 13 continuously flows backwards, the flue gas flows into the mixing bin 14, meanwhile, the powder spraying device 30 sprays powder into the mixing bin 14, the powder is fully mixed with the flue gas, asphalt smoke is adsorbed by the powder, most of asphalt smoke which is not removed by the previous process is absorbed by the powder, the flue gas and the powder flow backwards into the cyclone separator 15, most of the powder is filtered by the cyclone separator 15, and a small part of the powder flows into the cloth bag dust remover 16 along with the flue gas, the small particle powder is filtered and attached to the cloth bag, the small particle dust is beaten into the cloth bag through pulse vibration, the flue gas after the electric tar precipitator 13 is continuously flowed backwards through the automatic discharge hopper, the powder is collected through the cloth bag dust collector, the dust absorption hopper, the flue gas is discharged into the flue gas desulfurization dust removal tower 17 through the wet flue gas desulfurization tower 17, and the flue gas can be discharged into the wet flue gas dust removal tower 17, and the flue gas can be discharged through the wet flue gas desulfurization tower 17, and the flue gas dust removal stack 17 can be discharged when the flue gas is discharged through the wet flue gas dust removal tower 17, and the flue gas is discharged through the wet flue dust removal tower 17.
The utility model is not limited to the above-described alternative embodiments, and any person who may derive other various forms of products in the light of the present utility model, however, any changes in shape or structure thereof, all falling within the technical solutions defined in the scope of the claims of the present utility model, fall within the scope of protection of the present utility model.
Claims (10)
1. A method for purifying the tail gas of asphalt-containing smoke is characterized in that: the method comprises the following steps:
s1: delivering the flue gas generated in the roasting workshop into a cooling tower for cooling treatment, so that the temperature of the flue gas is reduced to 60-70 ℃;
s2: delivering the cooled flue gas to an electric tar precipitator for primary purification;
s3: delivering the flue gas purified by the electrical tar precipitator to a gas-solid mixing bin, mixing the flue gas and solid powder in the gas-solid mixing bin for 2-3 seconds, and fully adsorbing asphalt smoke by the solid powder to realize secondary purification;
s4: the flue gas after secondary purification and the solid powder absorbed with the asphalt flue gas are conveyed into a cyclone separator for primary gas-solid separation;
s5: the flue gas treated by the cyclone separator is conveyed to a bag-type dust remover for secondary gas-solid separation;
s6: delivering the flue gas filtered by the bag-type dust collector to an alkaline washing desulfurization tower for desulfurization treatment, SO that SO in the flue gas 2 The concentration is lower than 35mg/m 3 ；
S7: the desulfurized flue gas is subjected to wet electric dust collector to remove tiny dust and aerosol, then is conveyed to a chimney through a main fan, and is discharged to the atmosphere through the chimney.
2. The method for purifying an asphalt-containing flue gas according to claim 1, wherein: in the S2 step, the temperature of inlet flue gas of the electric tar precipitator is 60-70 ℃, the temperature of outlet flue gas is 50-60 ℃, and the efficiency of removing asphalt smoke is 70-80%.
3. The method for purifying an asphalt-containing flue gas according to claim 1, wherein: in the step S3, the mesh number of the solid powder is 200-300 meshes, the solid powder is sprayed into the gas-solid mixing bin through an automatic powder spraying device, so that the solid powder is forcedly mixed with the flue gas, and the adding amount of the automatic powder spraying device is 20-30 kg/m.
4. The method for purifying an asphalt-containing flue gas according to claim 1, wherein: s3, changing the flow velocity of the air flow at the air inlet end and the air outlet end of the air-solid mixing bin to be less than 1m/S; in the step S4, the flow velocity of the inlet of the cyclone separator is 16-22 m/S, the separation efficiency of the cyclone separator is 80-90%, and the concentration of particles in the flue gas at the outlet end of the cyclone separator is less than 100g/m 3 。
5. The method for purifying an asphalt-containing flue gas according to claim 1, wherein: in the S5 step, the filtering wind speed of the bag-type dust collector is less than or equal to 0.7m/min, and the concentration of particles in the flue gas at the outlet end of the bag-type dust collector is less than 10mg/m 3 The concentration of asphalt smoke is less than 20mg/m 3 。
6. A treatment system for an asphalt-containing smoke tail gas, which is characterized in that: the flue gas desulfurization and dust removal combined tower comprises a roasting furnace, a cooling tower, an electric tar precipitator, a mixing bin, a cyclone separator, a cloth bag dust remover, a wet desulfurization and dust removal combined tower, a main fan and a chimney which are sequentially communicated through a flue gas main pipe, wherein the mixing bin is made of round pipes, the pipe diameter of the mixing bin is identical to that of the flue gas main pipe, and the flue gas desulfurization and dust removal combined tower further comprises a powder spraying device, and the powder spraying device is communicated with the mixing bin through a powder spraying pipe.
7. The treatment system for bituminous fume of claim 6 wherein: the powder spraying device comprises a frame body, a powder bin, a weighing mechanism and a powder spraying mechanism, wherein the powder bin is arranged on the frame body, a blanking port is formed in the lower end of the powder bin, a first blanking valve is arranged at the blanking port, the weighing mechanism is arranged on the frame body and located below the blanking port of the powder bin, the powder spraying mechanism comprises a blower and a feeder, the air outlet end of the blower is communicated with one end of a powder spraying pipe, the upper end of the feeder is connected with the weighing mechanism, the lower end of the feeder is communicated with the side wall of the powder spraying pipe, which is close to one end of the blower, a powder spraying gun is arranged at one end of the powder spraying pipe, which is far away from the blower, and extends into the mixing bin, the powder spraying gun is obliquely arranged in the air flow direction in the mixing bin, and the included angle formed by the spraying direction of the powder spraying gun and the axis of the mixing bin is 45 degrees.
8. The treatment system for bituminous fume of claim 7 wherein: the material weighing mechanism comprises a material weighing bin and an online metering scale, the material weighing bin is located below a blanking port of the powder bin, the online metering scale is arranged at the lower end of the material weighing bin, and the upper end of the feeder penetrates into the material weighing bin from the bottom of the material weighing bin; the outer side wall of the powder bin is provided with a vibrator and a material level monitor.
9. The treatment system for bituminous fume of claim 7 wherein: the top of powder storehouse still is equipped with feed mechanism, feed mechanism includes storage box, filtration storehouse and vacuum pump, filtration storehouse set up in on the support body and be located the top of powder storehouse, the blanking mouth of filtration storehouse with the feed inlet of powder storehouse passes through the unloading pipe intercommunication just be equipped with the second unloading valve on the unloading pipe, the storage box with the filtration storehouse passes through the conveying pipe intercommunication, the vacuum pump with the filtration storehouse passes through evacuation tube intercommunication, be equipped with the filter between the conveying pipe mouth of pipe and the evacuation tube mouth of pipe in the filtration storehouse.
10. The treatment system for bituminous fume of claim 6 wherein: inspection manholes are formed in the flue gas main pipe between the roasting furnace and the cooling tower, the flue gas main pipe between the electric tar precipitator and the mixing bin and the flue gas main pipe between the mixing bin and the cyclone separator.
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