CN108469033B - Flue gas condensation dehumidification decontamination heating and whitening heat exchanger - Google Patents
Flue gas condensation dehumidification decontamination heating and whitening heat exchanger Download PDFInfo
- Publication number
- CN108469033B CN108469033B CN201810499100.1A CN201810499100A CN108469033B CN 108469033 B CN108469033 B CN 108469033B CN 201810499100 A CN201810499100 A CN 201810499100A CN 108469033 B CN108469033 B CN 108469033B
- Authority
- CN
- China
- Prior art keywords
- flue gas
- flue
- heat exchanger
- water
- decontamination
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 172
- 239000003546 flue gas Substances 0.000 title claims abstract description 172
- 230000005494 condensation Effects 0.000 title claims abstract description 68
- 238000009833 condensation Methods 0.000 title claims abstract description 68
- 238000007791 dehumidification Methods 0.000 title claims abstract description 59
- 238000005202 decontamination Methods 0.000 title claims abstract description 53
- 230000003588 decontaminative effect Effects 0.000 title claims abstract description 53
- 230000002087 whitening effect Effects 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 title claims abstract description 21
- 239000000779 smoke Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 100
- 238000002156 mixing Methods 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 claims description 7
- 230000007797 corrosion Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 206010022000 influenza Diseases 0.000 claims description 5
- 229910000676 Si alloy Inorganic materials 0.000 claims description 4
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000005242 forging Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 2
- 239000010962 carbon steel Substances 0.000 claims description 2
- 239000002737 fuel gas Substances 0.000 claims description 2
- 238000005201 scrubbing Methods 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 238000003303 reheating Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes or flue ways
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chimneys And Flues (AREA)
- Drying Of Gases (AREA)
Abstract
A heat exchanger for condensing, dehumidifying, decontaminating, heating and whitening flue gas is composed of a horizontal flue, a U-shaped flue and a flue gas regulating baffle; the flue gas enters a U-shaped flue through a horizontal flue after being turned by 90 degrees to wash the sensible heat exchanger and the primary condensation dehumidification and decontamination heat exchanger, and after being turned by 180 degrees, the flue gas washes the secondary condensation dehumidification and decontamination heat exchanger and the flue gas reheater; after dehumidification by the primary condensation dehumidification decontamination heat exchanger and the secondary condensation dehumidification decontamination heat exchanger, the flue gas reheater is used for heating, dehumidification and whitening; the split plate that is located the U type flue in the middle of the horizontal flue is provided with the flue gas regulation baffle, and this baffle can guarantee on the one hand that the flue gas directly gets into the chimney after system start or stop the stove in order to prevent that sensible heat exchanger from taking place the condensation, and on the other hand when external weather humidity changes or extreme cold weather appears, adjusts the aperture of flue gas baffle and can mix a part of dry flue gas and wet flue gas, guarantees to eliminate chimney white smoke more effectively under the full operating mode condition.
Description
Technical Field
The invention belongs to the field of dehumidification and whitening of flue gas of a gas boiler, energy conservation and environmental protection, and particularly relates to a heat exchanger for condensing, dehumidifying, decontaminating, heating and whitening of flue gas.
Background
Oil and gas combustion systems, while clean in combustion products, contain nitrogen oxides and small amounts of sulfur oxides and PM. Compared with a coal-fired boiler, the flue gas does not contain excessive chloride ions, but contains more water vapor. The smoke is directly discharged into the atmosphere, so that water vapor contained in the smoke is supersaturated and condensed to form white smoke plume, and visual pollution is formed; acid gases such as SO 3/H2SO4 and PM in the flue gas are combined to form local haze around the chimney and strengthen and spread the haze, and meanwhile, the acid gases such as SO 3/H2SO4 are condensed and separated out in the tail flue and the chimney, SO that the flue gas has extremely strong corrosiveness and brings hidden danger to the safe operation of a boiler system. Meanwhile, the white smoke plume contains a large amount of water vapor, so that water resource waste is caused. If condensation recovery is carried out, precious water resources can be saved. A spot is visible on the importance degree of dehumidification, decontamination and whitening of the smoke in the new regulations for treating local smoke plume in Shanghai, zhejiang, handy, tianjin and other places.
At present, most of flue gas whitening devices are flue gas reheating whitening devices, and wet flue gas is heated to an overheat state to remove white smoke plumes. The flue gas reheating and whitening easily causes corrosion and blockage of a flue gas reheater, and the flue gas is heated to 80 ℃ to cause great waste of energy. The heating method for eliminating the white smoke cannot eliminate the SO 3/H2SO4 and other acid gases and PM in the wet smoke, and SO 3/H2SO4 and PM are one of the murmurs of haze. Therefore, the flue gas condensation and whitening technology capable of obviously removing SO 3/H2SO4 and PM is gradually popularized.
The flue gas is condensed, dehumidified, decontaminated, heated and whitened, wet flue gas generated after boiler water supply or circulating water cooling combustion is utilized, condensation phase change heat in water vapor is recovered, and boiler efficiency is improved. The water vapor is condensed into submicron-sized droplets in the cooling process, and a large amount of SO 3/H2SO4 and PM in the flue gas can be adsorbed and removed. However, the sulfuric acid solution produced by condensation is highly corrosive and requires the materials of the heat exchanger.
The flue gas reheating and condensation dehumidification and whitening method has advantages and disadvantages, and the flue gas condensation and reheating are combined together, so that the dehumidification, decontamination and whitening effects are more remarkable.
Disclosure of Invention
In order to further improve the dehumidifying, decontaminating and whitening effects of the flue gas and bring the advantages of the prior art into play, the invention aims to provide the heat exchanger for condensing, dehumidifying, decontaminating, heating and whitening the flue gas.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The heat exchanger comprises a U-shaped flue 1, wherein a section of horizontal flue 2 is arranged at the upper part of the U-shaped flue 1, a sensible heat exchanger 3 and a primary condensation dehumidification decontamination heat exchanger 4,U are arranged on a flue gas inlet side pipeline of the U-shaped flue 1 from top to bottom, a 180-degree rotary flue 5 is arranged at the bottom of the U-shaped flue 1, and a secondary condensation dehumidification decontamination heat exchanger 6, a corrugated plate type demister 13 and a flue gas reheater 7 are arranged on a flue gas outlet side of the U-shaped flue 1 from bottom to top; a flue gas adjusting baffle 8 is arranged on the split plate positioned on the flue gas inlet side and the flue gas outlet side of the U-shaped flue 1 in the middle of the horizontal flue 2; the two heat exchangers are communicated by a water pipe, a pipeline, close to the wall surface, of the tail end of the secondary condensation dehumidification and decontamination heat exchanger 6 is a water supply pipeline, boiler water and flue gas are in countercurrent flow in sequence, and after being heated into hot water by the secondary condensation dehumidification and decontamination heat exchanger 6, the primary condensation dehumidification and decontamination heat exchanger 4 and the sensible heat exchanger 3, part of the hot water enters the flue gas reheater 7 to heat the flue gas, and the flue gas is mixed with hot water at a main flow outlet by the water mixing valve 9 and is sent into a boiler; under normal working conditions, the flue gas regulating baffle 8 is closed, flue gas enters the flue gas inlet side through the flue gas inlet of the U-shaped flue 1 by turning 90 degrees from the front half section of the horizontal flue 2, passes through the sensible heat exchanger 3 and the primary condensation dehumidification and decontamination heat exchanger 4 from top to bottom in turn through the gap between the flue and the pipe bundle at the flue gas inlet side, and enters the rear half section of the horizontal flue 2 and is discharged into a chimney by turning 90 degrees from bottom to top at the flue gas outlet side after turning at the 180-degree rotary flue 5; under extreme working conditions, the flue gas adjusting baffle 8 is opened according to the requirement, part of flue gas directly flows into the rear half section of the horizontal flue 2 from the front half section of the horizontal flue 2, and is mixed with the other part of wet flue gas coming out from the U-shaped flue 1 and then is discharged.
The bottom of the 180-degree rotary flue 5 is provided with a condensed water discharge device 10 with a water seal, and condensed water from flue gas in the flue gas outlet side of the U-shaped flue 1 and a corrugated plate demister 13 is collected.
The sensible heat exchanger 3, the primary condensation dehumidification and decontamination heat exchanger 4, the secondary condensation dehumidification and decontamination heat exchanger 6 and the flue gas reheater 7 are formed by one or more layers of tube bundles in sequence or staggered arrangement, and the tube bundles are arranged perpendicular to the cross section of the U-shaped flue 1.
The primary condensation dehumidification and decontamination heat exchanger 4, the secondary condensation dehumidification and decontamination heat exchanger 6 and the flue gas reheater 7 are all subjected to low-temperature heat exchange, are formed by adopting an enhanced heat transfer element and adopting aluminum-silicon alloy or austenitic stainless steel for casting, forging or welding so as to resist acid corrosion of condensed water of flue gas discharged by the oil-gas boiler.
The heat exchanger comprises a U-shaped flue 1, wherein the lower part of the U-shaped flue 1 is provided with a section of horizontal flue 2, a flue gas inlet side pipeline of the U-shaped flue 1 is provided with a sensible heat exchanger 3, the bottom of the U-shaped flue 1 is provided with a 180-degree rotary flue 5, the flue gas outlet side of the U-shaped flue 1 is provided with a secondary condensation dehumidification decontamination heat exchanger 6, and the condensation dehumidification decontamination heat exchanger 6 is communicated with the sensible heat exchanger 3 through a water pipe; a flue gas adjusting baffle 8 is arranged on the split plate positioned on the flue gas inlet side and the flue gas outlet side of the U-shaped flue 1 in the middle of the horizontal flue 2; the pipeline, close to the wall surface, of the tail end of the secondary condensation dehumidification and decontamination heat exchanger 6 is a water supply and inflow pipeline, a liquid collecting tank 14 and a condensed water discharging device 10 with water seal are arranged right below the flue gas outlet side of the U-shaped flue 1, a corrugated plate demister 13 is arranged at the position, close to the horizontal flue 2, of the liquid collecting tank 14, a flue gas reheater 7 is arranged at the second half section of the horizontal flue 2, and the flue gas reheater 7 is communicated with the sensible heat exchanger 3 through a water pipe; the boiler water supply and the flue gas are heated into hot water in a countercurrent way through a secondary condensation dehumidification decontamination heat exchanger 6 and a sensible heat exchanger 3 in sequence, hot water at an outlet of the sensible heat exchanger 3 is controlled by a water mixing valve 9 arranged outside the U-shaped flue 1, so that when part of the hot water enters a flue gas reheater 7 for heating, the flue gas is whitened, and the hot water is mixed with hot water at a main flow outlet through the water mixing valve 9 and is sent into the boiler; the flue gas enters the flue gas inlet side through the flue gas inlet of the U-shaped flue 1 by turning 90 degrees from the front half section of the horizontal flue 2, passes through the gap between the flue gas inlet side and the sensible heat exchanger 3 tube bundle, passes through the flue gas inlet side and passes through the flue gas reheater 7 by passing through the corrugated plate demister 13 after turning at the 180-degree rotary flue 5, passes through the second-stage condensation dehumidification decontamination heat exchanger 6 and enters the rear half section of the horizontal flue 2 by turning 90 degrees from the flue gas outlet side and is discharged into the chimney after passing through the first-stage horizontal flue rectification.
The sensible heat exchanger 3, the secondary condensation dehumidification and decontamination heat exchanger 6 and the flue gas reheater 7 are formed by one or more layers of tube bundles in sequence or staggered arrangement, and the tube bundles are arranged perpendicular to the section of the U-shaped flue 1.
The secondary condensation dehumidification decontamination heat exchanger 6 and the flue gas reheater 7 are both subjected to low-temperature heat exchange, are formed by adopting an enhanced heat transfer element and adopting aluminum-silicon alloy or austenitic stainless steel for casting, forging or welding, so as to resist acid corrosion of condensed water of flue gas discharged by the fuel oil and gas boiler.
The sensible heat exchanger 3 needs to control the inlet water temperature to be higher than the dew point temperature of the flue gas water to avoid the condensation of the flue gas, and the sensible heat exchanger 3 adopts a carbon steel reinforced heat transfer element.
The front half section of the horizontal flue 2, the rear half section of the horizontal flue 2 and 2 90-degree turning flues of the 180-degree rotary flue 5 are designed into isobaric flues, a splitter plate 12 is arranged at the outlet of the isobaric flues, and meanwhile, in order to obtain more uniform temperature fields, concentration fields and speed fields, the heat and mass transfer effectiveness of the flue gas is improved, and a flow equalizing grid 11 is arranged at the inlet section of the flue gas.
The mixing valve 9 has the functions of mixing main stream hot water and heating wet flue gas hot water, and can eliminate white smoke caused by atmospheric humidity change or extreme cold weather through adjusting the hot water flow of the heating wet flue gas.
The invention utilizes the combination of flue gas condensation and reheating technology to realize flue gas dehumidification and whitening, namely utilizes the sensible heat exchanger 3 to cool the flue gas to the temperature at which no condensation occurs at all (the designed working medium inlet temperature is 60 ℃, and the metal wall surface temperature is higher than the water dew point temperature); the temperature of the flue gas is further reduced by utilizing the primary condensation dehumidification and decontamination heat exchanger 4, partial vapor in the flue gas is condensed, partial SO 3 or H 2SO4 is condensed, concentrated H 2SO4 dew point corrosion can be generated, and ND steel is selected to manufacture the heat exchanger; the second-stage condensation dehumidification and decontamination heat exchanger 6 has the functions of condensing most of vapor in the flue gas, recovering the residual sensible heat and vaporization latent heat, and at the moment, because the vapor begins to condense and precipitate in a large amount, the vapor becomes a dilute acid solution, has stronger corrosiveness, and austenitic stainless steel or cast aluminum-silicon alloy should be selected.
In order to prevent the water vapor from continuously condensing in the subsequent flue and causing corrosion of the flue and influencing the service life, the invention adopts a flue gas reheating method to prevent the flue gas from continuously condensing in the flue, and the following two main solutions exist.
The first method is that a flue gas reheater 7 is added behind the secondary condensation dehumidification and decontamination heat exchanger 6, the heat exchange working medium in the pipe is from hot water at the outlet of the sensible heat exchanger 3, the water supply has quite high temperature after passing through the secondary condensation dehumidification and decontamination heat exchanger 6 and the sensible heat exchanger 3, the temperature of the flue gas at the outlet of the secondary condensation dehumidification and decontamination heat exchanger 6 is only 40 ℃, the temperature of the flue gas at the outlet of the secondary condensation dehumidification and decontamination heat exchanger 6 is increased by using outlet hot water, water drops formed during flue gas condensation are eliminated, water vapor in the flue gas is overheated, and the water vapor is prevented from being condensed in a subsequent flue.
In the second method, a smoke adjusting baffle plate 8 is additionally arranged in the horizontal flue 2, most of the boiler smoke is discharged through the sensible heat exchanger 3, the primary condensation dehumidification decontamination heat exchanger 4 and the secondary condensation dehumidification decontamination heat exchanger 6 to release sensible heat and vaporization latent heat, the temperature of the smoke is reduced, and the water vapor in the smoke reaches a saturated state; only a small part of the discharged smoke directly flows to the lower flue through the smoke adjusting baffle plate 8 and is mixed with the low-temperature smoke containing saturated steam, so that the saturated steam in the smoke absorbs heat and then generates overheat, and the steam is prevented from being condensed in the subsequent flue.
In order to make the reheating effect more obvious, the two methods can be combined together to thoroughly dehumidify, heat and whiten.
Drawings
FIG. 1 shows a design scheme of the invention with a flue gas reheater and a flue gas temperature regulating valve.
Fig. 2 shows a second embodiment of the invention.
FIG. 3 is a schematic view of a diverter plate according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, the invention relates to a flue gas condensation dehumidification decontamination heating and whitening heat exchanger, wherein the upper part of a U-shaped flue 1 is provided with a section of horizontal flue 2, a flue gas inlet side pipeline of the U-shaped flue 1 is provided with a flow equalization grid 11, a sensible heat exchanger 3 and a primary condensation dehumidification decontamination heat exchanger 4,U from top to bottom, the bottom of the flue gas 1 is provided with a 180 DEG rotary flue 5, the flue gas outlet side of the U-shaped flue 1 is turned from bottom to top through a secondary condensation dehumidification decontamination heat exchanger 6, a corrugated plate type demister 13 and a flue gas reheater 7, and then enters the second half section of the horizontal flue 2 and is discharged into a chimney, and a flue gas adjusting baffle 8 is arranged on a partition plate positioned on the flue gas inlet side and the flue gas outlet side of the U-shaped flue 1 in the middle of the horizontal flue 2. The boiler water is heated into hot water by the secondary condensation dehumidification and decontamination heat exchanger 6, the primary condensation dehumidification and decontamination heat exchanger 4 and the sensible heat exchanger 3 in sequence in countercurrent, and then part of the hot water enters the flue gas reheater 7 to heat the flue gas, and the flue gas is mixed with hot water at a main flow outlet through the water mixing valve 9 and is sent into the boiler. The condensed water discharging device 10 with water seal is arranged at the bottom of the 180-degree rotary flue 5, so that condensed water can be discharged and air can be prevented from entering the flue. Under normal working conditions, the flue gas regulating baffle 8 is closed, all flue gas from the boiler enters the U-shaped flue 1, the flue gas passes through the gaps of the heat exchanger tube bundles and passes through the heat exchanger tube bundles, and the flue gas is cooled to a temperature at which condensation does not occur in the sensible heat exchanger 3 (the designed working medium inlet temperature is 60 ℃, and the metal wall surface temperature is higher than the water dew point temperature); enters a first-stage condensation dehumidification decontamination heat exchanger 4, and part of water vapor and part of SO 3 or H 2SO4 are condensed at the moment, SO that desulfurization is realized; most of water vapor in the flue gas entering the secondary condensation dehumidification and decontamination heat exchanger 6 is condensed, and the rest sensible heat and the vaporization latent heat are recovered; in order to avoid corrosion caused by continuous condensation of the flue gas in a rear flue, on one hand, hot water (about 80-93 ℃) at the outlet of the sensible heat exchanger 3 is used for heating the flue gas, so that water drops formed during condensation of the flue gas are eliminated, water vapor in the flue gas is overheated, and the water vapor is prevented from being continuously condensed in the rear flue, so that white smoke is eliminated; on the other hand, when the humidity of the external weather changes or the extreme cold weather appears, the opening of the flue gas adjusting baffle plate 8 is adjusted to mix a part of dry flue gas and wet flue gas, so that the chimney white smoke can be effectively eliminated under the full working condition; meanwhile, a corrugated plate demister 13 is arranged between the secondary condensation dehumidification decontamination heat exchanger 6 and the flue gas reheater 7, so that water mist drops carried in flue gas can be eliminated, and waste of heat is avoided. Cooling water enters the flue gas outlet side of the U-shaped flue 1 from the tail end tube bundle of the secondary condensation dehumidification and decontamination heat exchanger 6, flows to the lower tube bundle after sequentially flowing through the same-layer tube bundles, and sequentially flows to the primary condensation dehumidification and decontamination heat exchanger 4 and the sensible heat exchanger 3 through water pipe connection among the heat exchangers, hot water at the outlet of the sensible heat exchanger 3 is controlled through a water mixing valve 9 arranged outside the U-shaped flue 1, so that a part of hot water flows into the flue gas reheater 7 to control the heating amount of the flue gas, and different requirements under various working conditions are met. Condensate generated by condensing the flue gas after passing through the condensation dehumidification decontamination heat exchanger flows into the condensate water discharge device 10 with water seal through the 180-degree rotary flue 5. A corrugated plate demister 13 is arranged between the secondary condensation dehumidification decontamination heat exchanger 6 and the flue gas reheater 7, so that water mist carried in flue gas can be removed, and the heat of the flue gas reheater 7 is prevented from being absorbed.
Referring to fig. 2, another heat exchanger for condensing, dehumidifying, decontaminating, heating and whitening flue gas is turned over from a horizontal flue 2 to 90 degrees to enter a flue gas inlet side of a U-shaped flue 1, the flue gas inlet side of the U-shaped flue 1 is provided with a flow equalization grid 11 and a sensible heat exchanger 3, a flue gas outlet side is provided with a condensing, dehumidifying and decontaminating heat exchanger 6, the condensing, dehumidifying and decontaminating heat exchanger 6 and the sensible heat exchanger 3 are communicated by water pipes, a liquid collecting tank 14 and a condensed water discharging device 10 with a water seal are arranged right below the flue gas outlet side of the U-shaped flue 1, a corrugated plate demister 13 is arranged at a position, close to the horizontal flue 2, of the liquid collecting tank 14, a flue gas reheater 7 is arranged at the rear half section of the horizontal flue 2, and a flow dividing plate 12 is arranged at the turning position of the flue. The flue gas enters the U-shaped flue 1 from the front half section of the horizontal flue 2, sensible heat exchange is performed firstly, condensation heat exchange is performed after passing through the 180-degree rotary flue 5, condensed water flows into the liquid collecting tank 14 and is discharged through the condensed water discharging device 10, the flue gas is turned over by 90 degrees and enters the horizontal flue 2, and enters the flue gas reheater 7 for reheating after being rectified by one section of the horizontal flue, and then is discharged at the rear half section of the horizontal flue 2. Also, according to the actual condition, the opening of the flue gas adjusting baffle plate 8 can be properly adjusted to enable the discharged flue gas to meet the discharge standard. Cooling water enters the U-shaped flue 1 through a last layer water pipe of the condensation dehumidification and decontamination heat exchanger 6, flows to a lower-level pipe bundle after sequentially flowing through the same-layer pipe bundles, flows to the sensible heat exchanger 3 through water pipe connection among the heat exchangers, and hot water at an outlet of the sensible heat exchanger 3 is controlled through a water mixing valve 9 arranged outside the U-shaped flue 1, so that a part of hot water flows into a flue gas reheater 7 to control heating quantity of flue gas, and different requirements under various working conditions are met.
Referring to fig. 3, a splitter plate 12 comprising a plurality of rectangular splitting openings is provided at the isopipe outlet.
Claims (4)
1. The utility model provides a flue gas condensation dehumidification scrubbing heating whitening heat exchanger, includes U type flue (1), its characterized in that: a section of horizontal flue (2) is arranged at the lower part of the U-shaped flue (1), a sensible heat exchanger (3) is arranged on a flue gas inlet side pipeline of the U-shaped flue (1), a 180-degree rotary flue (5) is arranged at the top of the U-shaped flue (1), a secondary condensation dehumidification and decontamination heat exchanger (6) is arranged on a flue gas outlet side of the U-shaped flue (1), and the condensation dehumidification and decontamination heat exchanger (6) and the sensible heat exchanger (3) are communicated through a water pipe; a flue gas adjusting baffle (8) is arranged on the split plate positioned at the flue gas inlet side and the flue gas outlet side of the U-shaped flue (1) in the middle of the horizontal flue (2); the pipeline, close to the wall surface, of the tail end of the secondary condensation dehumidification and decontamination heat exchanger (6) is a water supply and inlet pipeline, a liquid collecting tank (14) and a condensed water discharging device (10) with a water seal are arranged right below the flue gas outlet side of the U-shaped flue (1), a corrugated plate demister (13) is arranged at the position, close to the horizontal flue (2), of the liquid collecting tank (14), a flue gas reheater (7) is arranged at the rear half section of the horizontal flue (2), and the flue gas reheater (7) and the sensible heat exchanger (3) are communicated through water pipes; the boiler water supply and the flue gas are heated into hot water in a countercurrent way through a secondary condensation dehumidification decontamination heat exchanger (6) and a sensible heat exchanger (3), hot water at an outlet of the sensible heat exchanger (3) is controlled by a water mixing valve (9) arranged outside a U-shaped flue (1), so that part of the hot water enters a flue gas reheater (7) for being heated, and the flue gas is whitened, mixed with hot water at a main flow outlet through the water mixing valve (9) and sent into the boiler; the flue gas is folded upwards by 90 degrees from a horizontal flue (2) to enter the flue gas inlet side of a U-shaped flue (1), is transversely swept through the gap between the flue gas inlet side and a tube bundle of a sensible heat exchanger (3), is transversely swept through a second-stage condensation dehumidification decontamination heat exchanger (6) at the flue gas outlet side after being turned at a position of a 180-degree rotary flue (5), enters the rear half section of the horizontal flue (2), is rectified through a section of horizontal flue by a corrugated plate demister (13), enters a flue gas reheater (7) and is discharged into a chimney;
The sensible heat exchanger (3), the secondary condensation dehumidification decontamination heat exchanger (6) and the flue gas reheater (7) are formed by one or more layers of tube bundles in sequence or staggered manner, and the tube bundles are arranged perpendicular to the section of the U-shaped flue (1);
The front half section of the horizontal flue (2), the rear half section of the horizontal flue (2) and 2 90-degree turning flues of the 180-degree rotary flue (5) are designed into isobaric flues, a splitter plate (12) is arranged at an isobaric flue outlet, and meanwhile, in order to obtain more uniform temperature fields, concentration fields and speed fields, the heat and mass transfer effectiveness of the flue gas is improved, and a flow equalizing grid (11) is arranged at a flue gas inlet section.
2. The heat exchanger for condensing, dehumidifying, decontaminating, heating and whitening flue gas according to claim 1, wherein: the secondary condensation dehumidification decontamination heat exchanger (6) and the flue gas reheater (7) are both subjected to low-temperature heat exchange, are formed by adopting an enhanced heat transfer element and adopting aluminum-silicon alloy or austenitic stainless steel for casting, forging or welding, so as to resist acid corrosion of condensed water discharged by flue gas of the fuel gas boiler.
3. The heat exchanger for condensing, dehumidifying, decontaminating, heating and whitening flue gas according to claim 1, wherein: the sensible heat exchanger (3) needs to control the inlet water temperature to be higher than the flue gas water dew point temperature so as to avoid flue gas condensation, and the sensible heat exchanger (3) adopts a carbon steel enhanced heat transfer element.
4. The heat exchanger for condensing, dehumidifying, decontaminating, heating and whitening flue gas according to claim 1, wherein: the water mixing valve (9) has the functions of mixing main stream hot water and heating wet flue gas hot water, and can eliminate white smoke caused by atmospheric humidity change or extreme cold weather through adjusting the hot water flow of the heating wet flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499100.1A CN108469033B (en) | 2018-05-23 | 2018-05-23 | Flue gas condensation dehumidification decontamination heating and whitening heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499100.1A CN108469033B (en) | 2018-05-23 | 2018-05-23 | Flue gas condensation dehumidification decontamination heating and whitening heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108469033A CN108469033A (en) | 2018-08-31 |
| CN108469033B true CN108469033B (en) | 2024-05-28 |
Family
ID=63261423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810499100.1A Active CN108469033B (en) | 2018-05-23 | 2018-05-23 | Flue gas condensation dehumidification decontamination heating and whitening heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108469033B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109574463A (en) * | 2018-12-06 | 2019-04-05 | 天津五洲同创空调制冷设备有限公司 | A kind of steam dehumidifying machine for sludge drying |
| CN109626788B (en) * | 2018-12-06 | 2021-08-06 | 天津五洲同创空调制冷设备有限公司 | Heat pump device for sludge drying |
| CN109925838A (en) * | 2019-04-04 | 2019-06-25 | 华北水利水电大学 | A kind of flue gas condensing demisting disappears white device |
| CN110013744A (en) * | 2019-04-30 | 2019-07-16 | 上海华之邦科技股份有限公司 | A kind of low nitrogen boiler smoke recycling dehumidifier |
| CN110631044B (en) * | 2019-10-14 | 2024-07-09 | 西安交通大学 | Flue gas condensation heat exchanger of profile modeling flue gas runner structure |
| CN110906313A (en) * | 2019-12-25 | 2020-03-24 | 北京京诚科林环保科技有限公司 | Superheated steam generation system |
| CN112443853A (en) * | 2020-11-23 | 2021-03-05 | 西安热工研究院有限公司 | Efficient flue gas moisture recovery system and method with double flues |
| CN112902210A (en) * | 2021-03-18 | 2021-06-04 | 西安热工研究院有限公司 | Cold end heat exchange device for flue gas waste heat of thermal power station and control method |
| CN113154426A (en) * | 2021-03-25 | 2021-07-23 | 上海东润换热设备股份有限公司 | Boiler system and self-whitening waste heat recovery device thereof |
| CN112879894A (en) * | 2021-03-25 | 2021-06-01 | 上海东润换热设备股份有限公司 | Waste heat recovery system, waste heat recovery method and boiler system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0368599A2 (en) * | 1988-11-08 | 1990-05-16 | Emvertec Limited | Heat recovery systems |
| EP0434395A1 (en) * | 1989-12-19 | 1991-06-26 | Emvertec Limited | Condensing economisers |
| DE19808146A1 (en) * | 1998-02-27 | 1999-09-09 | Gea Waerme Und Umwelttechnik G | Demisting and heat recovery from flue gas e.g. gas-fired plant flue gas having high aggressive acid component content |
| CN202734580U (en) * | 2012-07-31 | 2013-02-13 | 四川川润动力设备有限公司 | Inverted U-shaped cement kiln heat recovery boiler kiln head flue heat exchange structure |
| CN105937773A (en) * | 2016-06-02 | 2016-09-14 | 山东泓奥电力科技有限公司 | Power station boiler condensing flue gas dehumidification and purification energy-saving system |
| CN106369623A (en) * | 2016-11-29 | 2017-02-01 | 冯伟忠 | System for removing smoke plumes through condensation, emission reduction, water collecting, heating and drying |
| CN107676805A (en) * | 2017-09-22 | 2018-02-09 | 华电电力科学研究院 | A kind of efficiently water intaking eliminating white smoke cooperation-removal pollutant device and its method of work |
| CN207350355U (en) * | 2017-10-26 | 2018-05-11 | 山东泓奥电力科技有限公司 | A kind of flue gas in power station boiler condenses reheating energy conserving system |
-
2018
- 2018-05-23 CN CN201810499100.1A patent/CN108469033B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0368599A2 (en) * | 1988-11-08 | 1990-05-16 | Emvertec Limited | Heat recovery systems |
| EP0434395A1 (en) * | 1989-12-19 | 1991-06-26 | Emvertec Limited | Condensing economisers |
| DE19808146A1 (en) * | 1998-02-27 | 1999-09-09 | Gea Waerme Und Umwelttechnik G | Demisting and heat recovery from flue gas e.g. gas-fired plant flue gas having high aggressive acid component content |
| CN202734580U (en) * | 2012-07-31 | 2013-02-13 | 四川川润动力设备有限公司 | Inverted U-shaped cement kiln heat recovery boiler kiln head flue heat exchange structure |
| CN105937773A (en) * | 2016-06-02 | 2016-09-14 | 山东泓奥电力科技有限公司 | Power station boiler condensing flue gas dehumidification and purification energy-saving system |
| CN106369623A (en) * | 2016-11-29 | 2017-02-01 | 冯伟忠 | System for removing smoke plumes through condensation, emission reduction, water collecting, heating and drying |
| CN107676805A (en) * | 2017-09-22 | 2018-02-09 | 华电电力科学研究院 | A kind of efficiently water intaking eliminating white smoke cooperation-removal pollutant device and its method of work |
| CN207350355U (en) * | 2017-10-26 | 2018-05-11 | 山东泓奥电力科技有限公司 | A kind of flue gas in power station boiler condenses reheating energy conserving system |
Non-Patent Citations (1)
| Title |
|---|
| 多管湿式静电除尘器等压入口设计研究;董勇;电力科技与环保;第32卷(第2期);第18-21页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108469033A (en) | 2018-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108469033B (en) | Flue gas condensation dehumidification decontamination heating and whitening heat exchanger | |
| CN109045953A (en) | A kind of cooling dehumidification by condensation decontamination reheating of flue gas disappears white system and method | |
| CN110425902A (en) | Flue gas waste heat recycling system and method after wet desulphurization | |
| CN110036238B (en) | Method and system for improving boiler effectiveness | |
| CN107261699A (en) | A kind of apparatus and method of the ultra-clean dedusting eliminating white smoke of desulfurization fume | |
| CN109939556A (en) | The flue gas advanced purification system and its method that residual heat utilization-type plume is eliminated | |
| CN105937773A (en) | Power station boiler condensing flue gas dehumidification and purification energy-saving system | |
| CN107433118A (en) | A kind of system and method for desulfurization fume eliminating white smoke | |
| CN209034070U (en) | A flue gas cooling condensation dehumidification decontamination reheating whitening system | |
| CN106940025A (en) | Fire coal boiler fume is purified and waste heat recovery processing system and method | |
| CN102607010A (en) | Composite phase-change heat exchange system | |
| CN108194939A (en) | It is a kind of to be used for the exhaust heat stepped device and method using with eliminating white smoke of thermal power plant | |
| CN112044222A (en) | A high temperature water flushing slag steam colored smoke plume removal system and method | |
| CN110772915A (en) | Sintering flue gas SCR denitration and whitening system and process | |
| CN102512910B (en) | Smoke heat exchange process for recycling evaporated water of gas desulfurization system | |
| CN110075698A (en) | The flue gas advanced purification system and its method that energy-saving plume is eliminated | |
| CN110433635A (en) | A kind of high-efficiency desulfurization eliminating white smoke device and technique | |
| CN109925839A (en) | It is a kind of to utilize fume afterheat deep condensation demister system | |
| CN109939557A (en) | The system and method for coloured plume are eliminated in collaboration | |
| NO159044B (en) | PROCEDURE AND DEVICE FOR RECOVERY HEATING OF EXPLOSED GAS. | |
| CN206755210U (en) | Fire coal boiler fume purifies and waste heat recovery processing system | |
| CN207196530U (en) | A kind of device for being used to eliminate boiler chimney white plume | |
| CN208382203U (en) | A kind of dehumidifying decontamination heating of flue gas condensing disappears white heat exchanger structure | |
| CN109539293A (en) | A kind of system and its operation method of coal-fired flue-gas minimum discharge collaboration UTILIZATION OF VESIDUAL HEAT IN | |
| CN211302509U (en) | Sintering flue gas SCR denitration and de-whitening system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |