CN109260914B - Flue gas whitening system and process utilizing air circulation - Google Patents
Flue gas whitening system and process utilizing air circulation Download PDFInfo
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- CN109260914B CN109260914B CN201811457087.XA CN201811457087A CN109260914B CN 109260914 B CN109260914 B CN 109260914B CN 201811457087 A CN201811457087 A CN 201811457087A CN 109260914 B CN109260914 B CN 109260914B
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- 239000003546 flue gas Substances 0.000 title claims abstract description 192
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 163
- 230000002087 whitening effect Effects 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 18
- 239000000428 dust Substances 0.000 claims description 17
- 239000000779 smoke Substances 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 description 15
- 239000003595 mist Substances 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000007791 dehumidification Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002918 waste heat 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
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
-
- 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
- B01D53/24—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 centrifugal force
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a flue gas whitening system and a flue gas whitening process by utilizing air circulation, wherein the flue gas whitening system comprises an air heat exchanger, a desulfurizing tower and a whitening tower, wherein the inside of the whitening tower sequentially comprises a dehumidifying heat exchanger and a mixer from bottom to top, the dehumidifying heat exchanger is of a tube-in-tube heat exchanger structure, the tube side of the dehumidifying heat exchanger is used for communicating the whitening tower up and down, a plurality of turbine blades are arranged in a tube of the dehumidifying heat exchanger, and a flue gas inlet of the whitening tower is arranged at the lower part of the whitening tower; the flue gas outlet of the air heat exchanger is connected with the flue gas inlet of the desulfurizing tower, the flue gas outlet of the desulfurizing tower is connected with the flue gas inlet of the white tower, the shell side inlet of the dehumidifying heat exchanger is connected with the outlet of the air blower, the shell side outlet of the dehumidifying heat exchanger is connected with the primary air inlet of the mixer through a primary air pipeline, the shell side outlet of the dehumidifying heat exchanger is connected with the air inlet of the air heat exchanger through an air diversion pipeline, the air outlet of the air heat exchanger is connected with the secondary air inlet of the mixer, and the flue gas in the white tower is sequentially discharged from the top of the white tower through the dehumidifying heat exchanger and the mixer.
Description
Technical Field
The invention belongs to the field of flue gas treatment, relates to a technology for removing white smoke from flue gas, and in particular relates to a flue gas whitening system and a flue gas whitening process by utilizing air circulation.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The low-temperature saturated wet flue gas is directly discharged through a chimney and is mixed with the environment atmosphere with lower temperature, a large amount of water vapor in the flue gas is condensed into small liquid drops, and the wet flue gas is white or gray under the refraction or scattering effect of light, namely the so-called white flue gas. In order to eliminate the influence of 'white smoke' on the environment, the smoke needs to be subjected to whitening treatment.
The flue gas whitening in the existing market is to add a flue gas-water heat exchanger or a spray tower to reduce the flue gas temperature after a desulfurizing tower or a dust remover, and the water temperature is increased while the flue gas temperature is reduced.
Disclosure of Invention
According to the invention, the air is utilized for whitening, the air is utilized for cooling the flue gas, the moisture in the flue gas is separated out, the temperature of the air is also increased, and the air with the increased temperature is utilized for mixing with the separated flue gas. The smoke temperature is raised and then discharged into the atmosphere, so that the smoke plume is eliminated, and the purpose of whitening the smoke is achieved.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the flue gas whitening system utilizing air circulation comprises an air heat exchanger, a desulfurizing tower and a whitening tower, wherein the whitening tower is vertically arranged and sequentially comprises a dehumidifying heat exchanger and an air-flue gas mixer from bottom to top, the dehumidifying heat exchanger is of a tube-in-tube heat exchanger structure, the whitening tower is communicated up and down by the tube pass of the dehumidifying heat exchanger, a plurality of turbine blades are axially arranged in the tube of the dehumidifying heat exchanger according to the tube-in-tube direction, a flue gas inlet of the whitening tower is arranged at the lower part of the whitening tower, a flue gas inlet of the whitening tower is positioned below the dehumidifying heat exchanger, and a flue gas outlet of the whitening tower is arranged at the top of the whitening tower;
the flue gas outlet of the air heat exchanger is connected with the flue gas inlet of the desulfurizing tower, the flue gas outlet of the desulfurizing tower is connected with the flue gas inlet of the white tower, the shell side inlet of the dehumidifying heat exchanger is connected with the outlet of the air blower, the shell side outlet of the dehumidifying heat exchanger is connected with the primary air inlet of the air-flue gas mixer through a primary air pipeline, the shell side outlet of the dehumidifying heat exchanger is connected with the air inlet of the air heat exchanger through an air diversion pipeline, the air outlet of the air heat exchanger is connected with the secondary air inlet of the air-flue gas mixer, and the flue gas in the white tower is sequentially discharged from the top of the white tower through the dehumidifying heat exchanger and the mixer.
The invention also aims to provide a flue gas whitening process utilizing air circulation, and the flue gas whitening system is provided, wherein flue gas sequentially enters an air heat exchanger and a desulfurizing tower for primary cooling and desulfurizing, then enters the desulfurizing tower, flue gas in the desulfurizing tower firstly enters a dehumidifying heat exchanger for secondary cooling, enters an air-flue gas mixer after being dehumidified by a turbine blade fan rotational flow, and is mixed with air in the air-flue gas mixer for heating and then is discharged out of the desulfurizing tower; the air blower conveys air to the dehumidifying heat exchanger, the dehumidifying heat exchanger is subjected to secondary cooling and is subjected to primary heating, one part of air after primary heating enters the mixer to be mixed with dehumidified smoke, the other part of air enters the air heat exchanger, the air heat exchanger is subjected to primary cooling and is subjected to secondary heating, and the air after secondary heating enters the mixer to be mixed with dehumidified smoke.
The beneficial effects of the invention are as follows:
1. the invention utilizes air to cool the flue gas, get out of water, and simultaneously the temperature of the air is increased, and then utilizes the air to be mixed with low-temperature flue gas, so that the temperature of the flue gas is increased, the flue gas plume is eliminated, and the whitening requirement is met.
2. The flue gas whitening process does not consume water, and can reduce the flue gas whitening cost.
3. According to the invention, the dehumidification heat exchanger and the air heat exchanger are used for respectively carrying out primary temperature rise and secondary temperature rise on air, and the final exhaust gas temperature adjustment can be realized by controlling the proportion of the primary temperature rise air and the secondary temperature rise air entering the air-flue gas mixer.
4. The invention directly utilizes the waste heat of the flue gas, and the heat exchanger is not needed to be added in the flue gas temperature raising procedure in the flue gas discharging process.
5. The invention uses air to cool the flue gas, so that the procedure of reducing the flue gas temperature does not need a cooling tower or a spray tower, and the investment is small.
6. The dehumidifying heat exchanger is integrated with the white tower, so that the occupied space is reduced.
7. When the system provided by the invention is used for whitening the flue gas, the flue gas is further dedusted, so that the ultra-clean emission of the flue gas can be achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the exemplary embodiments of the disclosure and together with the description serve to explain the disclosure, and do not constitute an undue limitation on the disclosure.
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic view of a tube array of the desiccant heat exchanger of the present invention;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a schematic view of the structure of an air-flue gas mixer;
wherein, 1, a flue gas fan, 2, an air heat exchanger, 3, a desulfurizing tower, 4, a wet electric dust collector, 5, a booster fan, 6, an air fan, 7, a dehumidifying heat exchanger, 8, a gas-water separator, 9, an inner chimney, 10, an air-flue gas mixer, 11, an outer chimney, 12, a white tower, 13, a split-flow fan, 14, a vortex leaf fan, 15, a fixed rod, 16, a fixed frame, 17 and a gas disturbance baffle.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the present disclosure. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As introduced in the background art, the invention provides a flue gas whitening system and a flue gas whitening process by using air circulation in order to solve the technical problems.
The utility model provides a typical implementation mode of the invention provides a flue gas whitening system utilizing air circulation, which comprises an air heat exchanger, a desulfurizing tower and a whitening tower, wherein the whitening tower is vertically arranged and sequentially comprises a dehumidifying heat exchanger and an air-flue gas mixer from bottom to top, the dehumidifying heat exchanger is of a tube-in-tube heat exchanger structure, a tube pass of the dehumidifying heat exchanger is used for communicating the whitening tower up and down, a plurality of turbine blades are axially arranged in the tube of the dehumidifying heat exchanger according to the tube-in-tube, a flue gas inlet of the whitening tower is arranged at the lower part of the whitening tower, a flue gas inlet of the whitening tower is positioned below the dehumidifying heat exchanger, and a flue gas outlet of the whitening tower is arranged at the top of the whitening tower;
the flue gas outlet of the air heat exchanger is connected with the flue gas inlet of the desulfurizing tower, the flue gas outlet of the desulfurizing tower is connected with the flue gas inlet of the white tower, the shell side inlet of the dehumidifying heat exchanger is connected with the outlet of the air blower, the shell side outlet of the dehumidifying heat exchanger is connected with the primary air inlet of the air-flue gas mixer through a primary air pipeline, the shell side outlet of the dehumidifying heat exchanger is connected with the air inlet of the air heat exchanger through an air diversion pipeline, the air outlet of the air heat exchanger is connected with the secondary air inlet of the air-flue gas mixer, and the flue gas in the white tower is sequentially discharged from the top of the white tower through the dehumidifying heat exchanger and the mixer.
The utilization of the air to the residual heat of the flue gas is performed in a countercurrent way, the flue gas is cooled twice, the air is heated twice, unheated air exchanges heat with the cooled flue gas, and the heated air exchanges heat with the unheated flue gas again, so that the residual heat of the flue gas can be completely utilized. Second, because the air after primary heating and the air after secondary heating are adopted to be mixed with the flue gas, the temperature of the flue gas can be controlled. Thirdly, a plurality of vortex leaf fans are added in the dehumidifying heat exchanger, so that the flue gas rotationally flows in the tube, the heat exchange efficiency of the flue gas in the tube is improved, the flue gas rotationally rises, mist drops and dust flow to the tube wall under the action of centrifugal force, the mist drops collide with each other and are condensed into larger drops in the movement process, the drops are thrown to the surface of the inner wall of the tube body, and the drops fall into slurry together after contacting with a drop layer attached to the wall surface, so that dust removal and water removal are realized.
In one or more embodiments of this embodiment, a gas-water separator is disposed within the de-white column, the gas-water separator being disposed between the air-flue gas mixer and the dehumidification heat exchanger. The water in the flue gas can be further removed. The outlet of the gas-water separator is provided with an inner cylinder, and the outer diameter of the inner cylinder is equal to the outer diameter of the outlet of the gas-water separator.
In one or more embodiments of this embodiment, a dust collector is provided between the desulfurizing tower and the whitening tower. Most dust in the flue gas can be removed, the treatment capacity of the whitening tower on the flue gas dust is reduced, and the treatment efficiency of the whitening tower on the moisture in the flue gas is provided. The dust remover is a wet electric dust remover.
In one or more embodiments of this embodiment, the flue gas inlet of the leukoreduction column is provided with a booster fan, and the outlet of the booster fan is connected to the flue gas inlet of the leukoreduction column. The rate of the flue gas entering the whitening tower is increased, so that the efficiency of the whitening tower in removing the moisture in the flue gas is provided.
In one or more embodiments of this embodiment, the air distribution duct is provided with a distribution fan, the outlet of which communicates with the air inlet of the air heat exchanger. The ratio of primary heating air to secondary heating air can be controlled, thereby increasing the exhaust gas temperature.
In one or more embodiments of this embodiment, the flue gas inlet of the air heat exchanger is provided with a flue gas fan, and the outlet of the flue gas fan is connected to the flue gas inlet of the air heat exchanger. The kinetic energy of the flue gas flowing in the system is increased.
In one or more embodiments of this embodiment, the inlet of the air distribution duct is provided on the primary air duct wall.
In one or more embodiments of this embodiment, a fixed rod is disposed within the tube array of the dehumidified heat exchanger, and the vortex leaf fan is fixed to the fixed rod. The axis of the fixed rod coincides with the axis of the tube array. Fixing frames are arranged at two ends of the fixing rod, and the fixing rod is connected with the heat exchange tube array through the fixing frames.
In one or more embodiments of this embodiment, the air-flue gas mixer is a gas perturbation baffle, the gas perturbation baffle is perpendicular to the axis of the de-white tower, and the primary air inlet and the secondary air inlet of the air-flue gas mixer are both disposed above the gas perturbation baffle. The primary air inlet and the secondary air inlet of the air-flue gas mixer are both directed towards the gas disturbance baffle.
In another embodiment of the disclosure, a flue gas whitening process using air circulation is provided, the flue gas enters an air heat exchanger and a desulfurizing tower in sequence for primary cooling and desulfurizing, then enters the desulfurizing tower, flue gas in the desulfurizing tower firstly enters a dehumidifying heat exchanger for secondary cooling in the dehumidifying heat exchanger and enters an air-flue gas mixer after being dehumidified by a turbine blade fan rotational flow, and in the air-flue gas mixer, the dehumidified and cooled flue gas and air are mixed and heated, and then discharged out of the desulfurizing tower; the air blower conveys air to the dehumidifying heat exchanger, the dehumidifying heat exchanger is subjected to secondary cooling and is subjected to primary heating, one part of air after primary heating enters the mixer to be mixed with dehumidified smoke, the other part of air enters the air heat exchanger, the air heat exchanger is subjected to primary cooling and is subjected to secondary heating, and the air after secondary heating enters the mixer to be mixed with dehumidified smoke.
In order to enable those skilled in the art to more clearly understand the technical solutions of the present disclosure, the technical solutions of the present disclosure will be described in detail below with reference to specific embodiments.
Examples
A flue gas whitening system utilizing air circulation is composed of an air heat exchanger 2, a desulfurizing tower 3, a wet electric dust collector 4 and a whitening tower 12 as shown in figures 1-3.
The tower body of the white tower 12 is provided with an outer chimney 11 vertically, and comprises a dehumidifying heat exchanger 7, a gas-water separator 8 and an air-smoke mixer 10 from bottom to top, wherein an inner chimney 9 is arranged at the outlet of the gas-water separator 8, and the outer diameter of the inner chimney 9 is equal to the outer diameter of the outlet of the gas-water separator 8. The dehumidifying heat exchanger 7 is of a tube-in-tube heat exchanger structure, a tube side of the dehumidifying heat exchanger 7 is used for communicating the dehumidifying tower 12 up and down, a plurality of turbine leaf fans 14 are axially arranged in the tube-in-tube of the dehumidifying heat exchanger 7 according to the tube-in-tube direction, a fixing rod 15 is arranged in the tube-in-tube of the dehumidifying heat exchanger 7, the vortex leaf fans 14 are fixed on the fixing rod 15, and the axis of the fixing rod 15 coincides with the axis of the tube-in-tube. The flue gas inlet of the white tower 12 is arranged at the lower part of the white tower 12, the flue gas inlet of the white tower 12 is positioned below the dehumidifying heat exchanger 7, and the flue gas outlet of the white tower 12 is arranged at the top of the white tower 12.
The flue gas outlet of the air heat exchanger 2 is connected with the flue gas inlet of the desulfurizing tower 3, the flue gas outlet of the desulfurizing tower 3 is connected with the flue gas inlet of the wet electric dust collector 4, the flue gas outlet of the wet electric dust collector 4 is connected with the inlet of the booster fan 5, the outlet of the booster fan 5 is connected with the flue gas inlet of the white tower 12, the shell side inlet of the dehumidifying heat exchanger 7 is connected with the outlet of the air fan 6, the shell side outlet of the dehumidifying heat exchanger 7 is connected with the primary air inlet of the air-flue gas mixer 10 through a primary air pipeline, the shell side outlet of the dehumidifying heat exchanger 7 is connected with the air inlet of the air heat exchanger 2 through an air diversion pipeline, the air outlet of the air heat exchanger 2 is connected with the secondary air inlet of the air-flue gas mixer 10, and the flue gas in the white tower 12 is sequentially discharged from the top of the white tower through the dehumidifying heat exchanger 7, the air-water separator 8, the inner chimney 9 and the air-flue gas mixer 10.
The air diversion pipeline is provided with a diversion fan 13, and the outlet of the diversion fan 13 is communicated with the air inlet of the air heat exchanger 2.
The flue gas inlet of the air heat exchanger 2 is provided with a flue gas fan 1, and the outlet of the flue gas fan 1 is connected with the flue gas inlet of the air heat exchanger 2.
The flue gas generated in production is boosted by the flue gas fan 1 and then enters the air heat exchanger 2 to exchange heat with the air from the split-flow fan 13 in the air heat exchanger 2, the flue gas temperature is reduced and then enters the desulfurizing tower 3 to desulfurize, so that the sulfur content of the flue gas reaches the emission standard, then enters the wet electric dust collector 4, then enters the white tower 12 by the flue gas booster fan 5, and in the white tower 12, the heat exchange is carried out between the dehumidifying heat exchanger 7 and the new air from the air fan 6, and the flue gas temperature is reduced. Before the flue gas enters the white tower, the flue gas is subjected to desulfurization and wet electric dust removal, and after the flue gas is saturated and enters the dehumidifying heat exchanger 7, the flue gas exchanges heat with new air, and the temperature is reduced. The flue gas is changed from saturated flue gas into supersaturated flue gas, and water in the flue gas is condensed.
The flue gas rises in the white tower 12, enters the gas-water separator 8, and the gas and water are further separated. Then enters the air-flue gas mixer 10 to be mixed with the air heated in the dehumidifying heat exchanger 7 and the air heated in the air heat exchanger 2, the temperature of the mixed flue gas is increased, the relative humidity is greatly reduced, and the water mist phenomenon is avoided when the mixed flue gas is discharged into the atmosphere. The chimney can not emit white smoke, and the purpose of whitening the smoke is achieved.
The key parts of the dehumidifying heat exchanger 7 are that vortex leaf fans 14 are arranged in a tube array, when the dehumidifying heat exchanger works, flue gas flows from bottom to top, the flue gas is enabled to rise in a rotating mode due to the guiding effect of the vortex leaf fans 14, mist drops and dust flow to the tube wall under the action of centrifugal force, the mist drops collide with each other and are condensed into larger drops in the movement process, and the drops are thrown to the inner wall surface of the tube and fall into slurry together with the drop layers attached to the wall surface after contacting, so that dust removal and water discharge are achieved.
And (3) a white tower: the flue gas flows in the whitening tower. The flue gas is cooled by the heat exchanger 7, the air is heated by the heat exchanger 7, and most of water in the flue gas is discharged out due to the fact that the flue gas is cooled to become supersaturated flue gas, and the supersaturated flue gas flows into the bottom of the white tower on the tube array to be discharged. The upper part of the heat exchanger 7 in the white tower is provided with a gas-water separator 8, so that the gas-water separation of the flue gas is further realized. The upper part of the white tower is provided with an air-flue gas mixer 10, so that flue gas is fully mixed with air, and the flue gas is discharged into the atmosphere after the temperature of the flue gas is increased. Heat exchange tube array of the temperature removal heat exchanger 7: the heat exchange tube is internally provided with a plurality of vortex leaf fans 14, the leaf fans are fixed by fixing rods 15, fixing frames 16 are arranged at two ends of the fixing rods, and the fixing rods 15 are connected with the heat exchange tube through the fixing frames 16. The flue gas rises through the rotation of the vortex leaf fan, water drops are thrown to the barrel wall under the action of centrifugal force, and flow into the bottom of the white tower to be discharged under the action of gravity.
The air-flue gas mixer 10 is shown in fig. 4 as a gas disturbance baffle 17, the gas disturbance baffle 17 is arranged in the white tower 12, the gas disturbance baffle 17 is perpendicular to the axis of the white tower 12, a primary air inlet and a secondary air inlet of the air-flue gas mixer are all arranged above the gas disturbance baffle 17, and the primary air inlet and the secondary air inlet of the air-flue gas mixer are both directed to the gas disturbance baffle 17. After the flue gas meets the gas disturbance baffle 17 from bottom to top, the flue gas diffuses all around, and primary air and secondary air also diffuse all around after meeting the gas disturbance baffle 17, so that the primary air, the secondary air and the flue gas can be fully mixed and then discharged into the atmosphere.
The new air is boosted by the air blower 6, enters the temperature-removing heat exchanger 7, exchanges heat with the flue gas, reduces the temperature of the flue gas, and gets out of saturated water in the flue gas, after the temperature of the air is raised, one part of the air directly enters the air-flue gas mixer 10, the other part of the air enters the air heat exchanger 2 by the split blower 13, exchanges heat with the flue gas in the air heat exchanger 2, the temperature of the air is further raised, then enters the air-flue gas mixer 10, and is fully mixed with the flue gas and primary air, and then is discharged into the atmosphere through a chimney.
The foregoing description of the preferred embodiments of the present disclosure is provided only and not intended to limit the disclosure so that various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (7)
1. The flue gas whitening system utilizing air circulation is characterized by comprising an air heat exchanger, a desulfurizing tower and a whitening tower, wherein the whitening tower is vertically arranged and sequentially comprises a dehumidifying heat exchanger and an air-flue gas mixer from bottom to top, the dehumidifying heat exchanger is of a tube-in-tube heat exchanger structure, a tube pass of the dehumidifying heat exchanger is used for communicating the whitening tower up and down, a plurality of turbine blades are axially arranged in the tube of the dehumidifying heat exchanger according to the tube-in-tube direction, a flue gas inlet of the whitening tower is arranged at the lower part of the whitening tower, a flue gas inlet of the whitening tower is positioned below the dehumidifying heat exchanger, and a flue gas outlet of the whitening tower is arranged at the top of the whitening tower;
the flue gas outlet of the air heat exchanger is connected with the flue gas inlet of the desulfurizing tower, the flue gas outlet of the desulfurizing tower is connected with the flue gas inlet of the white tower, the shell side inlet of the dehumidifying heat exchanger is connected with the outlet of the air blower, the shell side outlet of the dehumidifying heat exchanger is connected with the primary air inlet of the air-flue gas mixer through a primary air pipeline, the shell side outlet of the dehumidifying heat exchanger is connected with the air inlet of the air heat exchanger through an air diversion pipeline, the air outlet of the air heat exchanger is connected with the secondary air inlet of the air-flue gas mixer, and the flue gas in the white tower is sequentially discharged from the top of the white tower through the dehumidifying heat exchanger and the mixer;
a gas-water separator is arranged in the whitening tower and is arranged between the air-flue gas receiving mixer and the dehumidifying heat exchanger;
an inner chimney is arranged at the outlet of the gas-water separator, and the outer diameter of the inner chimney is equal to the outer diameter of the outlet of the gas-water separator;
a dust remover is arranged between the desulfurizing tower and the whitening tower.
2. The system of claim 1, wherein the flue gas inlet of the de-white tower is provided with a booster fan, and an outlet of the booster fan is connected to the flue gas inlet of the de-white tower.
3. The system of claim 1, wherein the air distribution duct is provided with a distribution fan, an outlet of the distribution fan being in communication with an air inlet of the air heat exchanger.
4. The system of claim 1, wherein the flue gas inlet of the air heat exchanger is provided with a flue gas fan, and an outlet of the flue gas fan is connected to the flue gas inlet of the air heat exchanger.
5. The system of claim 1, wherein the inlet of the air distribution duct is provided in the primary air duct wall.
6. The system of claim 1, wherein a fixed rod is provided in the tube array of the dehumidifying heat exchanger, and the vortex leaf fan is fixed on the fixed rod.
7. The flue gas whitening process by utilizing air circulation is characterized in that the flue gas whitening system is provided, wherein flue gas sequentially enters an air heat exchanger and a desulfurizing tower for primary cooling and desulfurizing, then enters the whitening tower, flue gas in the whitening tower firstly enters a dehumidifying heat exchanger for secondary cooling in the dehumidifying heat exchanger, enters an air-flue gas mixer after being dehumidified by a turbine blade fan rotational flow, and is mixed with air in the air-flue gas mixer for heating and then is discharged out of the whitening tower; the air blower conveys air to the dehumidifying heat exchanger, the dehumidifying heat exchanger is subjected to secondary cooling and is subjected to primary heating, one part of air after primary heating enters the mixer to be mixed with dehumidified smoke, the other part of air enters the air heat exchanger, the air heat exchanger is subjected to primary cooling and is subjected to secondary heating, and the air after secondary heating enters the mixer to be mixed with dehumidified smoke.
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| CN109876589A (en) * | 2019-03-15 | 2019-06-14 | 海宁马桥大都市热电有限公司 | The system and method for white purified treatment are taken off for Hazards in Power Plant flue gas |
| CN109806704B (en) * | 2019-03-19 | 2024-03-08 | 山东楚雨源环保科技有限公司 | Double-stage type heat conduction oil circulation type high-temperature flue gas whitening treatment system |
| CN110345502A (en) * | 2019-07-18 | 2019-10-18 | 天津大学 | Complete " disappearing white " device of boiler smoke that a kind of dehumidifying, cooling combine |
| CN110354670A (en) * | 2019-08-15 | 2019-10-22 | 太原黑猫炭黑有限责任公司 | A kind of boiler with tailed flue gas takes off white system and method |
| CN110935277A (en) * | 2019-12-25 | 2020-03-31 | 河南心连心化学工业集团股份有限公司 | Coal chemical industry solid waste drying tail gas treatment device and treatment method |
| CN111964093A (en) * | 2020-08-07 | 2020-11-20 | 北京英翔博瑞耐火材料科技有限公司 | Natural power air cooling and flue gas de-whitening device and flue gas de-whitening method |
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