CN108654221B - Flue gas dehydration system and dehydration method thereof - Google Patents
Flue gas dehydration system and dehydration method thereof Download PDFInfo
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- CN108654221B CN108654221B CN201810466322.3A CN201810466322A CN108654221B CN 108654221 B CN108654221 B CN 108654221B CN 201810466322 A CN201810466322 A CN 201810466322A CN 108654221 B CN108654221 B CN 108654221B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 341
- 239000003546 flue gas Substances 0.000 title claims abstract description 339
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000018044 dehydration Effects 0.000 title claims abstract description 35
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 35
- 239000000779 smoke Substances 0.000 claims abstract description 231
- 239000007789 gas Substances 0.000 claims abstract description 203
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 80
- 239000000428 dust Substances 0.000 claims abstract description 79
- 238000009833 condensation Methods 0.000 claims abstract description 72
- 230000005494 condensation Effects 0.000 claims abstract description 72
- 238000011282 treatment Methods 0.000 claims abstract description 43
- 230000008569 process Effects 0.000 claims abstract description 22
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 19
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 15
- 208000005156 Dehydration Diseases 0.000 claims description 29
- 238000009792 diffusion process Methods 0.000 claims description 29
- 239000007921 spray Substances 0.000 claims description 18
- 238000000605 extraction Methods 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 17
- 239000000945 filler Substances 0.000 claims description 15
- 238000006477 desulfuration reaction Methods 0.000 claims description 14
- 230000023556 desulfurization Effects 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 13
- 229920003023 plastic Polymers 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 239000011152 fibreglass Substances 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000012856 packing Methods 0.000 claims description 7
- 238000000746 purification Methods 0.000 claims description 7
- 230000001788 irregular Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 239000002923 metal particle Substances 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000002087 whitening effect Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 241000237942 Conidae Species 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- MXWHMTNPTTVWDM-NXOFHUPFSA-N mitoguazone Chemical group NC(N)=N\N=C(/C)\C=N\N=C(N)N MXWHMTNPTTVWDM-NXOFHUPFSA-N 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- -1 electric power Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011328 necessary treatment Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a flue gas dehydration system and a dehydration method thereof, wherein the system comprises a flue gas production device, an induced draft fan, a first heat exchanger, a desulfurizing tower, a dust remover, a flue gas dehydrator, a second heat exchanger and a chimney; all parts are communicated through a gas conveying pipeline, and industrial flue gas sequentially passes through all parts in a flue gas dehydration system through the gas conveying pipeline to carry out dehydration and dust removal treatment. When the flue gas is treated by combining mechanical dewatering and condensation dewatering, the amount of the screwed flue gas in the inner pipe of the smoke guide pipe can be controlled by the exhaust fan, so that cold flue gas and hot flue gas are optimally mixed at the condensing plate, and the flue gas is more efficiently condensed and thoroughly dewatered; the saturated water content in the flue gas treated by the system and the process is reduced below 8%, and the phenomena of chimney rain and white smoke plume can not occur even in winter, so that the efficient whitening effect is achieved.
Description
Technical Field
The invention belongs to the technical field of industrial flue gas treatment, and particularly relates to a flue gas dehydration system and a dehydration method thereof.
Technical Field
The flue gas generated in the production process related to the fields of coal combustion, petroleum, steel, electric power, chemical industry and the like contains more water vapor, sulfur, dust and other impurities, and has great harm to air, human body and environment. Therefore, strict treatment is required before discharge. In recent years, dust and SO are in contact with strict environmental requirements 2 The discharge requirements in the aspects of the like can be met, in the treatment process, the wet desulfurization accounts for about 84 percent of the existing desulfurization device put into production, the moisture content in the flue gas after the wet desulfurization reaches 13-15 percent, the temperature of the flue gas is reduced to 45-60 ℃, and the moisture content of the flue gas after the ammonia desulfurization reaches 15-40 percent. When the desulfurized flue gas enters the environment, the water vapor in the flue gas is in a saturated state, part of the water vapor is condensed into mist, and water drops formed by condensation are formedThe refraction and scattering of light make the smoke show white or black yellow to appear a 'white smoke plume' phenomenon, even the 'chimney rain' phenomenon is formed by condensation near the chimney, the air quality is greatly influenced, even the visibility is reduced by forming fog, and the traffic is seriously influenced.
Therefore, the later stage of water vapor removal (commonly referred to as "whitening") becomes a necessary treatment process in flue gas treatment. At present, the common operation of 'whitening' is to add a heat exchanger in the flue gas treatment process to condense and remove the water vapor in the flue gas, and then heat and diffuse the flue gas out of a chimney. Therefore, the process not only causes the consumption of resources, manpower and material resources, but also does not achieve the corresponding water removal effect.
Disclosure of Invention
In order to solve the problems, the invention provides a flue gas dehydration system and a dehydration method thereof, wherein the dehydration system reduces energy consumption caused in the flue gas treatment process, achieves better water removal and dust removal effects, can better avoid the generation of chimney rain and white smoke plume in each season, and can thoroughly eliminate saturated steam and entrained steam in the flue gas.
The invention is realized by the following technical proposal
The flue gas dehydrator comprises a dehydrator front section and a dehydrator rear section, wherein the dehydrator front section is communicated with the dehydrator rear section; the front section of the dehydrator comprises a smoke channel, a front section shell, a supporting plate arranged at the front end inside the front section shell and a smoke guide pipe arranged inside the front section shell, wherein the front end of the smoke guide pipe is fixedly connected with the supporting plate, and the rear end of the smoke guide pipe is fixedly connected with the rear section of the dehydrator; the smoke guide pipe comprises a smoke collection shell, a smoke guide pipe inner pipe and a smoke guide pipe outer pipe, wherein the smoke collection shell is a hollow reducing pipe, the diameter of a smoke inlet end of the smoke collection shell is larger than that of a smoke outlet end, the smoke outlet end of the smoke collection shell is fixedly connected with the smoke inlet end of the smoke guide pipe inner pipe, the smoke inlet end of the smoke collection shell is fixedly connected with the front end of the smoke guide pipe outer pipe, a first cavity is formed by the smoke collection shell, the pipe wall of the smoke guide pipe inner pipe and the pipe wall of the smoke guide pipe outer pipe, and a cyclone plate is arranged at the middle and rear end inside the smoke guide pipe inner pipe; the rear end of the smoke channel is communicated with the smoke inlet end of the smoke collecting shell, the front shell is provided with an extraction opening female opening, the wall of the inner tube of the smoke guide tube is provided with a plurality of smoke through holes, and the wall of the outer tube of the smoke guide tube is provided with a plurality of extraction openings;
The rear section of the dehydrator comprises a gas diffusion cavity, and a second gas outlet is arranged on the gas diffusion cavity; the middle and rear ends of the inside of the gas diffusion cavity are sequentially provided with a cold smoke pipeline and a condensing plate, and the cold smoke pipeline is provided with a plurality of gas spray heads;
the extraction opening female port is communicated with the exhaust fan through a gas conveying pipeline, the exhaust fan is communicated with the condenser through the gas conveying pipeline, and the condenser is communicated with the inlet of the cold smoke pipeline through the gas conveying pipeline.
The first cavity is a first condensation chamber, and the first condensation chamber comprises a condensation net layer arranged outside the pipe wall of the inner pipe of the smoke guide pipe, a filler layer arranged between the pipe wall of the inner pipe of the smoke guide pipe and the condensation net layer, and a second gas cavity formed between the condensation net layer and the pipe wall of the outer pipe of the smoke guide pipe; the filler layer is made of hollow metal particles, hollow plastic particles, rock particles easy to absorb water or activated carbon particles, the condensing net layer is a porous condensing net or a grid condensing net, and the filler layer is made of metal, plastic pp or glass fiber reinforced plastic plate; and an extraction opening is arranged on the wall of the outer tube of the smoke guide tube corresponding to the second gas cavity.
The middle front end of the inner tube of the smoke guide tube is provided with an annular supporting plate (surrounding the wall of the inner tube of the smoke guide tube and arranged between the inner tube of the smoke guide tube and the cavity of the outer tube of the smoke guide tube), the inner diameter of the annular supporting plate is consistent with the outer diameter of the inner tube of the smoke guide tube, and the outer diameter of the annular supporting plate is consistent with the inner diameter of the outer tube of the smoke guide tube; the annular supporting plate divides the first cavity into a third gas cavity and a second condensing chamber; the second condensation chamber comprises a condensation net layer arranged outside the pipe wall of the inner pipe of the smoke guide pipe, a packing layer arranged between the pipe wall of the inner pipe of the smoke guide pipe and the condensation net layer, and a fourth gas cavity formed between the condensation net layer and the pipe wall of the outer pipe of the smoke guide pipe; the annular support plate is provided with a through hole (the position of the through hole is positioned at the position, close to the outer tube wall of the smoke guide tube, of the annular support plate), the through hole enables a third gas cavity to be communicated with a fourth gas cavity, and extraction openings are formed in the outer tube wall of the smoke guide tube, corresponding to the third gas cavity and the fourth gas cavity;
the material of the packing layer is hollow metal particles, hollow plastic particles, rock particles easy to absorb water or activated carbon particles, the condensing net layer is a porous condensing net or a grid condensing net, and the material of the condensing net layer is metal, plastic pp or glass fiber reinforced plastic plate.
The smoke collecting shell is a hollow truncated cone shell or a hollow truncated pyramid shell.
The front section of the dehydrator is detachably connected with the rear section of the dehydrator; the inner tube of the smoke guide tube is a round tube, a regular polygonal tube with the number of sides being 4 or more or an irregular polygonal tube with the number of sides being 4 or more, and the outer tube of the smoke guide tube is a round tube, a regular polygonal tube with the number of sides being 4 or more or an irregular polygonal tube with the number of sides being 4 or more; the end part of the smoke outlet end of the smoke collecting shell is fixedly connected with the end part of the smoke inlet end of the smoke guide pipe inner pipe in a matching way, and the end part of the smoke inlet end of the smoke collecting shell is fixedly connected with the end part of the front end of the smoke guide pipe outer pipe in a matching way; the gas spray heads on the cold flue gas pipeline face the condensing plate, the water collecting tank is arranged at the bottom of the condensing plate and communicated with the drain pipe, and the condensing plate is a porous condensing net or a grid condensing plate and is made of metal, plastic pp or glass fiber reinforced plastic.
The flue gas dehydration system comprises a flue gas output device, an induced draft fan, a first dust remover, a first heat exchanger, a desulfurizing tower, a second dust remover, a flue gas dehydrator, a second heat exchanger and a chimney; the flue gas outlet of the flue gas output device is communicated with the induced draft fan through a gas conveying pipeline, the induced draft fan is communicated with the inlet of the first dust remover through the gas conveying pipeline, the outlet of the first dust remover is communicated with the gas inlet of the first heat exchanger through the gas conveying pipeline, the gas outlet of the first heat exchanger is communicated with the gas inlet of the desulfurizing tower through the gas conveying pipeline, the gas outlet of the desulfurizing tower is communicated with the gas inlet of the second dust remover through the gas conveying pipeline, the gas outlet of the second dust remover is communicated with the inlet of the flue gas dehydrator through the gas conveying pipeline, the second outlet of the flue gas dehydrator is communicated with the gas inlet of the second heat exchanger through the gas conveying pipeline, and the gas outlet of the second heat exchanger is communicated with the gas inlet of the chimney through the gas conveying pipeline.
The flue gas dehydration system is characterized in that the first dust remover is a dry type dust remover, and the second dust remover is a wet type dust remover; the first heat exchanger is a cooler and is used for cooling the flue gas; the second heat exchanger is a heater and is used for heating the flue gas after water removal and purification.
The circulating water outlet of the first heat exchanger is communicated with the circulating water inlet of the second heat exchanger, so that hot water obtained after the temperature of the first heat exchanger is reduced heats the flue gas in the second heat exchanger; realizing the recycling of energy.
A method for dehydrating flue gas by using the flue gas dehydration system, comprising the following steps:
conveying the flue gas generated by the flue gas generating device into a first dust remover through a gas conveying pipeline by an induced draft fan for dust removal treatment (conventional dry electric dust removal), and conveying the flue gas into a first heat exchanger through the gas conveying pipeline for cooling treatment;
the cooled flue gas enters a desulfurizing tower through a gas conveying pipeline to be desulfurized (conventional wet desulfurization is adopted for treatment), and the desulfurized flue gas is conveyed to a second dust remover through the gas conveying pipeline to be dedusted (conventional wet electric precipitation is carried out);
Conveying the flue gas subjected to the second electric dust removal treatment to a flue gas dehydrator through a gas conveying pipeline for dehydration treatment;
and conveying the dehydrated flue gas to a second heat exchanger through a gas conveying pipeline for heating treatment, and conveying the heated flue gas to a gas inlet of a chimney through the gas conveying pipeline and discharging the flue gas through the chimney.
In the flue gas dehydration method, the heat exchange medium in the first heat exchanger is water, and the temperature of the flue gas after the temperature of the first heat exchanger is reduced is 90-110 ℃; the flue gas temperature of the flue gas outlet of the desulfurizing tower is 44-60 ℃; the temperature of the flue gas passing through the second dust collector is 45-60 ℃ (namely, the temperature of the flue gas at the outlet of the second dust collector is 45-60 ℃). The temperature of the flue gas heated by the second heater is 70-85 ℃, and the flue gas is discharged from a chimney after being heated.
The flue gas dehydration method comprises the following steps of:
the method comprises the steps that smoke after dust removal of a dust remover is conveyed to a smoke channel of a front section shell of a dehydrator through a gas conveying pipeline, then enters a smoke guide pipe of the front section shell from the smoke channel, enters a smoke collecting shell from a smoke collecting shell smoke inlet end of the smoke guide pipe into the smoke collecting shell, is compressed through the smoke collecting shell and enters a smoke guide pipe inner pipe, performs rotational flow rotation at a rotational flow plate in the smoke guide pipe inner pipe, and part of smoke is screwed out of the smoke guide pipe inner pipe through a smoke through hole of a smoke guide pipe inner pipe wall and enters a packing layer for preliminary separation and condensation; the smoke which is not screwed out continuously flows forwards along the inner pipe of the smoke guide pipe, and enters the gas diffusion cavity at the rear section of the dehydrator through the inner pipe of the smoke guide pipe;
The flue gas after preliminary separation and condensation enters a second gas cavity or a third gas cavity and a fourth gas cavity through a packing layer under the action of an exhaust fan in a dehydrator, and is discharged from an exhaust opening arranged on the wall of an outer tube of a smoke guide tube to enter a front section of shell; the flue gas in the front section shell is conveyed into a condenser through a front section shell extraction opening female port, a gas conveying pipeline and an exhaust fan to be thoroughly condensed and filtered for water removal; the condensed flue gas enters the cold flue gas pipeline through a condenser outlet, a gas conveying pipeline and a cold flue gas pipeline inlet, and then is sprayed to a condensing plate through a gas spray nozzle arranged on the cold flue gas pipeline.
Meanwhile, the volume of the smoke which is not screwed out rapidly expands and diffuses after reaching the diffusion cavity, the gas naturally condenses in the smoke in the natural heat absorption process due to the volume increase, part of condensed water is separated out and then continuously flows forwards to reach the condensing plate, the condensed water is mixed and stirred with cold smoke sprayed out of the gas spray head, the whole smoke is accelerated to be condensed, saturated water and entrained water in the smoke are condensed into liquid water drops which are gathered on the condensing plate through the mixed stirring and condensation, and the liquid water drops are collected and discharged;
And discharging the flue gas after mixed condensation and water removal through a second gas outlet at the rear section of the dehydrator, conveying the flue gas to a second heat exchanger through a gas conveying pipeline, heating the flue gas through the second heat exchanger, and conveying the heated flue gas to a chimney through the gas conveying pipeline for discharge.
According to the flue gas dehydration method, the flow and the pressure of the exhaust fan during working are set according to actual operation, and a plurality of exhaust fans can be adopted in the actual treatment process.
According to the flue gas dehydration method, part of flue gas of the inner pipe of the smoke guide pipe screwed out of the cyclone plate accounts for 20-60% of the total volume of the flue gas, and the rest of flue gas is the flue gas which is not screwed out; the temperature of the flue gas after condensing by the condenser is 30-45 ℃; the temperature of the flue gas discharged from the second gas outlet of the dehydrator is 42-48 ℃.
Compared with the prior art, the invention has the following positive and beneficial effects
In the process of treating the flue gas, the flue gas dehydrator is adopted to mechanically compress and swirl the flue gas through the smoke guide pipe, the flue gas is divided into two parts for respectively treating, and the flue gas is initially separated through the compression of the smoke guide pipe, the swirling flow of the swirling flow plate and the suction effect of the suction pump; a part of the flue gas which is swirled out is primarily condensed through a condensing net layer, then the flue gas is conveyed into a condenser through a front section shell extraction opening female port, a gas conveying pipeline and an exhaust fan, and is thoroughly condensed and filtered for water removal through the condenser; the condensed flue gas enters the cold flue gas pipeline through a condenser outlet, a gas conveying pipeline and a cold flue gas pipeline inlet, and is sprayed to a condensing plate through a gas spray nozzle arranged on the cold flue gas pipeline;
After the other part of the smoke which is not screwed out continuously enters the gas diffusion cavity, the volume of the smoke is expanded and diffused, and the smoke is subjected to heat absorption and natural condensation and enters a condensing plate; meanwhile, part of cold flue gas treated by the condenser is sprayed to the condensing plate through the gas spray nozzle, and two parts of cold flue gas at the condensing plate are mixed and stirred, and the naturally condensed hot flue gas is accelerated to promote condensation, so that saturated water and entrained moisture in the residual hot flue gas are removed more efficiently.
In the process, the condenser only needs to condense the flue gas of the primary separation part, and does not need to condense and cool all hot flue gas, so that the total amount of flue gas cooling treatment is reduced; meanwhile, part of flue gas subjected to condensation and filtration treatment by the condenser is adopted to promote condensation of residual hot flue gas in the diffusion section, so that heat energy consumption of the flue gas in the water removal treatment process is reduced, the efficiency of the flue gas water removal treatment is higher, and the phenomena of 'chimney rain' and 'white smoke plume' are avoided in winter.
According to the invention, through the exhaust fan and the air suction channel, the flue gas volume of the flue gas preliminary separation after compression and rotational flow in the inner pipe of the flue gas guide pipe can be regulated and controlled, and the flue gas enters the condenser through the exhaust fan to be subjected to thorough condensation and filtration treatment; the flue gas volume of cold flue gas required by the diffusion section can be adjusted along with the change of the external temperature, so that the cold flue gas and the hot flue gas are optimally mixed at the condensing plate, the condensation of residual hot flue gas is promoted to be more efficient, and the heat loss is minimum.
In the invention, only the separated flue gas is subjected to deep condensation and filtration treatment in the water removal working process, so that the total heat energy loss is less, the requirements on the specification and the heat exchange area of the second heat exchanger are reduced, the flue gas resistance of the second heat exchanger is reduced, and the consumed power of the second heat exchanger is reduced; as the heat energy consumption of the second heat exchanger is reduced, the heat energy provided by the first heat exchanger is required to be reduced, so that the specification and heat exchange area of the first heat exchanger are reduced, and the weight is reduced at the same time; the heat exchange area and the weight of the primary heat exchanger and the secondary heater are reduced, and the manufacturing cost of the equipment is reduced; the occupied area of the equipment is reduced, so that the equipment is more convenient to arrange on a production site; meanwhile, in the installation construction stage, the construction and hoisting cost can be reduced; thus, the overall cost of the entire project can be reduced.
The invention reduces the total amount of circulating water matched with the primary heat exchanger and the secondary heat exchanger due to the reduction of the area and the weight of the primary heat exchanger and the secondary heater, reduces the total power of the circulating water pump, and reduces the consumption of water resources, thereby reducing the annual running cost of the whole system;
in the condensate water treatment process, a part of tiny particle dust is removed through the condensate water, and the condensate water treatment process has the dust removal effect.
Therefore, the invention carries out preliminary separation of the flue gas through mechanical compression and cyclone action, condenses the separated gas, filters and removes water, and then accelerates the condensation of the hot flue gas naturally condensed by the diffusion section through the cold flue gas spray head, so that the whole dehydration process is more efficient and thorough, the total consumption and loss of heat energy are reduced, and the annual running cost of the system is reduced; the equipment is convenient to arrange and construct and implement, the comprehensive construction cost of engineering is reduced, the social benefit and the economic benefit are obvious, and the implementation and the popularization are easy.
The saturated water content in the flue gas treated by the system and the process is reduced to below 8 percent (volume ratio), and the dust content is reduced to 8mg/Nm 3 Below, even down to 5mg/Nm 3 In the following, the phenomena of chimney rain and white smoke plume can not occur even in winter, and the efficient whitening effect is achieved.
Drawings
Figure 1 is a front view of the dehydrator front section casing,
figure 2 is a cross-sectional view of the dehydrator,
figure 3 is a longitudinal cross-sectional view of the front section of the dehydrator shown in figure 2,
figure 4 is a cross-sectional view of the smoke guide tube of the dehydrator shown in figure 2,
figure 5 is a schematic view of the inner tube structure of the smoke guide tube shown in figure 4,
Figure 6 is a cross-sectional view of a smoke tube with an annular support plate,
figure 7 is a schematic view of the inner tube structure of the smoke guide tube shown in figure 6,
figure 8 is a schematic view of the structure of the annular support plate,
figure 9 is a longitudinal section view of the entering direction of the flue gas at the rear section of the dehydrator,
figure 10 is a schematic diagram of the flue gas dehydration system,
the symbols in the drawings represent the following meanings: 01 represents a flue gas generating device, 02 represents an induced draft fan, 03 represents a first dust remover, 04 represents a first heat exchanger, 05 represents a desulfurizing tower, 06 represents a second dust remover, 07 represents a flue gas dehydrator, 08 represents a second heat exchanger, and 09 represents a chimney;
in the flue gas dehydrator 07, 1 denotes a front section shell, 2 denotes a support plate, 3 denotes a smoke guide pipe, 4 denotes a gas diffusion cavity, 5 denotes a cold flue gas pipeline, 6 denotes a gas spray head, 7 denotes a condensing plate, 8 denotes a water collecting tank, 9 denotes a water drain pipe, 10 denotes an exhaust fan, 11 denotes a condenser, and 12 denotes a flue gas channel; 101 denotes a suction opening female port, 301 denotes a smoke collecting housing, 302 denotes a smoke guiding tube inner tube, 303 denotes a smoke guiding tube outer tube, 304 denotes a condensing screen layer, 305 denotes a filler layer, 306 denotes a second gas chamber, 307 denotes a swirl plate, 308 denotes a smoke through hole, 309 denotes a suction opening, 310 denotes an annular support plate, 311 denotes a third chamber, 312 denotes a fourth chamber, 3101 denotes a through hole in the annular support plate, 401 denotes a second gas outlet.
Detailed Description
The present invention will be described in more detail by way of specific examples, which should not be construed as limiting the scope of the invention.
Example 1
A flue gas dehydrator, as shown in fig. 1, 2, 3, 4 and 5, comprising a dehydrator front section and a dehydrator rear section, wherein the dehydrator front section is communicated with the dehydrator rear section; the front section of the dehydrator comprises a smoke channel 12, a front section shell 1, a support plate 2 arranged at the front end inside the front section shell 1 and a smoke guide tube 3 arranged in the front section shell, wherein the front end of the smoke guide tube 3 is fixedly connected with the support plate 2, and the rear end of the smoke guide tube 3 is fixedly connected with the rear section of the dehydrator; the smoke guide pipe 3 comprises a smoke collection shell 301, a smoke guide pipe inner pipe 302 and a smoke guide pipe outer pipe 303, the smoke collection shell 301 is a hollow reducing pipe, the diameter of the smoke inlet end of the smoke collection shell is larger than that of the smoke outlet end, the smoke outlet end of the smoke collection shell 301 is fixedly connected with the smoke inlet end of the smoke guide pipe inner pipe 302, the smoke inlet end of the smoke collection shell 301 is fixedly connected with the front end of the smoke guide pipe outer pipe 303, and a cavity formed by the smoke collection shell 301, the smoke guide pipe inner pipe 302 and the pipe wall of the smoke guide pipe outer pipe 303 is a first cavity, and a cyclone plate 307 is arranged at the middle and rear section in the smoke guide pipe inner pipe; the rear end of the smoke channel 12 is communicated with the smoke inlet end of the smoke collecting shell, the front shell is provided with an extraction opening female opening 101, the wall of the inner tube 302 of the smoke guiding tube is provided with a plurality of smoke through holes 308, and the wall of the outer tube of the smoke guiding tube is provided with a plurality of extraction openings 309;
The rear section of the dehydrator comprises a gas diffusion cavity 4, and a second gas outlet 401 is arranged on the gas diffusion cavity 4; the middle and rear ends of the inside of the gas diffusion cavity 4 are sequentially provided with a cold smoke pipeline 5 and a condensation plate 7, the cold smoke pipeline 5 is provided with a plurality of gas spray heads 6, the spray nozzles of the gas spray heads 6 face the condensation plate 7, the lower end of the condensation plate 7 is provided with a water collecting tank 8, and the water collecting tank 8 is connected with a drain pipe 9, so that condensed water in the water collecting tank is continuously discharged by the drain pipe;
the extraction opening female port 101 of the front-stage shell is communicated with the exhaust fan 10 through a gas conveying pipeline, the exhaust fan 10 is communicated with the condenser 11 through the gas conveying pipeline, and the condenser 11 is communicated with the inlet of the cold flue gas pipeline 5 through the gas conveying pipeline;
the first cavity is a first condensation chamber, and the first condensation chamber includes a condensation mesh layer 304 disposed around the outer wall of the inner tube 302 of the smoke guide tube, a filler layer 305 disposed between the inner tube 302 of the smoke guide tube and the condensation mesh layer 304, and a second gas cavity 306 formed between the condensation mesh layer 304 and the outer tube 303 of the smoke guide tube.
The end part of the rear section of the outer tube of the smoke guide tube is fixedly connected with the gas diffusion cavity of the rear section of the dehydrator in a sealing manner so as to prevent gas from escaping.
Further, a plurality of smoke guide pipes (capable of increasing the treatment capacity of the smoke) can be placed in the front section shell 1, the front ends of the smoke guide pipes are fixedly connected with the support plate, the rear ends of the smoke guide pipes are fixedly connected with the gas diffusion cavity of the rear section of the dehydrator, the inner pipe of the smoke guide pipe is communicated with the gas diffusion cavity, and the smoke guide pipes in the front section shell and the shell are detachably connected with the gas diffusion cavity of the rear section of the dehydrator.
Further, the smoke collecting shell is a hollow truncated cone shell or a hollow truncated pyramid shell;
further, the inner tube of the smoke guide tube can be a round tube, a regular polygonal tube with the number of sides being 4 or more or an irregular polygonal tube with the number of sides being 4 or more; the outer tube of the smoke guide tube is a round tube, a regular polygonal tube with the number of sides being 4 or more or an irregular polygonal tube with the number of sides being 4 or more; the end part of the smoke inlet end of the inner tube of the smoke guide tube is matched and fixedly connected with the end part of the smoke outlet end of the smoke collecting shell, and the end part of the front end of the outer tube of the smoke guide tube is matched and fixedly connected with the end part of the smoke inlet end of the smoke collecting shell.
Furthermore, the filler layer is made of hollow metal particles, hollow plastic particles, rock particles easy to absorb water or activated carbon particles, the condensing net layer is a porous condensing net or a grid condensing net, and the filler layer is made of metal, plastic pp or glass fiber reinforced plastic plates.
Further, the condensing plate is a hole-shaped condensing net or a grid-shaped condensing net, and is made of metal, plastic pp or glass fiber reinforced plastic plate.
Example 2
The same parts of embodiment 2 as those of embodiment 1 have the same meaning and function and will not be repeated for the sake of brevity. As shown in fig. 6, 7 and 8, an annular support plate 310 is arranged at the middle front section of the inner tube of the smoke guide tube, the inner diameter of the annular support plate 310 is consistent with the outer diameter of the inner tube of the smoke guide tube, and the outer diameter of the annular support plate is consistent with the inner strength of the outer tube of the smoke guide tube; the annular supporting plate 310 divides the first cavity into a third gas cavity and a second condensation chamber, the second condensation chamber comprises a condensation net layer arranged around the outside of the inner pipe of the smoke guide pipe, a filler layer is arranged between the condensation net layer and the pipe wall of the inner pipe of the smoke guide pipe, and a fourth gas cavity is formed between the condensation net layer and the pipe wall of the outer pipe of the smoke guide pipe;
the annular support plate is provided with a through hole 3101, the through hole 3101 is arranged at the edge of the annular support plate, close to the outer diameter, of the annular support plate, so that a third gas cavity and a fourth gas cavity are communicated, and exhaust openings are formed in the outer tube wall of the smoke guide tube, corresponding to the third gas cavity and the fourth gas cavity. The purified flue gas after condensing and dewatering through the packing layer, the condensing net and the like can be discharged from the extraction openings of the third gas cavity and the fourth gas cavity, enters the front-section shell, and then enters the condenser due to the first gas outlet and the exhaust fan, so that the primarily purified flue gas can be discharged in time, the purification discharge amount of the flue gas is controlled, and the dewatering and dedusting purification processes of part of the flue gas are completed efficiently.
Example 3
A flue gas dehydration system comprising the flue gas dehydration device of embodiment 1 or embodiment 2, as shown in fig. 10, the system comprises a flue gas generating device 01, a draught fan 02, a first dust remover 03, a first heat exchanger 04, a desulfurizing tower 05, a second dust remover 06, a flue gas dehydrator 07, a second heat exchanger 08, and a chimney 09; the flue gas outlet of the flue gas output device 01 is communicated with the induced draft fan 02 through a gas conveying pipeline, the induced draft fan 02 is communicated with the inlet of the first dust remover 03 through a gas conveying pipeline, the outlet of the first dust remover 03 is communicated with the gas inlet of the first heat exchanger 04 through a gas conveying pipeline, the gas outlet of the first heat exchanger 04 is communicated with the gas inlet of the desulfurizing tower 05 through a gas conveying pipeline, the gas outlet of the desulfurizing tower 05 is communicated with the gas inlet of the second dust remover 06 through a gas conveying pipeline, the gas outlet of the second dust remover 06 is communicated with the flue gas channel of the flue gas dehydrator 07 through a gas conveying pipeline, the second gas outlet of the flue gas dehydrator 07 is communicated with the gas inlet of the second heat exchanger 08 through a gas conveying pipeline, and the gas outlet of the second heat exchanger 08 is communicated with the inlet of the chimney 09 through a gas conveying pipeline;
Further, the first dust remover 03 is a dry type dust remover, and the second dust remover 06 is a wet type dust remover; the first heat exchanger 04 is a cooler and is used for cooling the entered smoke; the second heat exchanger 08 is a heater and is used for heating the flue gas after dust removal and water removal; the dust remover is a wet dust remover;
further, the circulating water outlet of the first heat exchanger is communicated with the circulating water inlet of the second heat exchanger through the liquid conveying pipeline, so that the hot water obtained after the temperature of the flue gas is reduced by the first heat exchanger heats the flue gas in the second heat exchanger, the energy recycling is better realized, and the energy consumption is greatly reduced.
In the system, partial flue gas is primarily condensed and thoroughly condensed, saturated water and entrained water in the flue gas are removed, fine dust particles in the flue gas are further removed, then the part of flue gas after water removal by purification and the hot flue gas of the rest untreated part (the part of flue gas is subjected to primary natural condensation through a gas diffusion cavity) are mixed and stirred at a condensing plate, the condensed part of flue gas is adopted to cool the rest part of flue gas subjected to natural condensation, the removal of saturated water in the flue gas is realized without additional energy input, and the removal efficiency is higher; the method has the advantages that the method realizes the efficient removal of saturated water and entrained water in the flue gas on the basis of simple operation and energy conservation, avoids the generation of chimney rain and white smoke plume in each season, and has remarkable social and economic benefits.
Example 4
One of the methods for dehydrating the flue gas by adopting the flue gas dehydration system is as follows:
the example deals with industrial fumes generated by power plants:
the flue gas produced in the flue gas production device is subjected to denitration treatment by adopting a conventional method, then is conveyed into a dry electric dust collector through a gas conveying pipeline to be subjected to dry electric dust collection treatment, and is conveyed into a first heat exchanger through the gas conveying pipeline to be cooled (the medium adopted for cooling is water), so that the temperature of the flue gas is reduced to 90-110 ℃ from the initial temperature (130-150 ℃);
the flue gas cooled to 90-110 ℃ is conveyed to a desulfurizing tower through a gas conveying pipeline for wet desulfurization (conventional wet desulfurization), and the gas (the temperature is 46-48 ℃) after desulfurization by the desulfurizing tower is conveyed to a wet electric dust collector through the gas conveying pipeline for wet electric dust collection (conventional wet electric dust collection); the temperature of the flue gas after wet electric precipitation is reduced to 45-47 ℃;
delivering the flue gas subjected to desulfurization and dust removal treatment into a dehydrator through a gas delivery pipeline, firstly, delivering the flue gas into a flue gas channel of a front section shell of the dehydrator, then, delivering the flue gas into the flue gas collecting shell from the flue gas inlet end of the front section shell, compressing the flue gas through the flue gas collecting shell and delivering the flue gas into a flue gas guide pipe inner pipe, generating a cyclone effect after delivering the flue gas into the flue gas guide pipe inner pipe through a cyclone plate in the flue gas guide pipe inner pipe, screwing out part of the flue gas entering the flue gas guide pipe inner pipe, delivering the screwed-out part of the flue gas into a filler layer of a first condensing chamber through a plurality of flue gas through holes arranged on the flue gas guide pipe inner pipe wall to obtain preliminary condensation, delivering the gas after preliminary condensation into a second gas cavity through a condensation network layer, setting the flow and the pressure of the flue gas entering the second gas cavity in an exhaust fan (the flue gas inlet of the exhaust fan is according to the requirements in the actual treatment process), controlling the flue gas quantity of the cyclone out of the flue gas guide pipe inner pipe to be 20-60 percent of the total volume of the flue gas introduced into the flue gas guide pipe inner pipe, delivering the flue gas into the front section shell of the dehydration front section through a gas guide pipe wall, delivering the flue gas through an exhaust gas suction pipe on the front section shell, delivering the flue gas into a gas inlet of the condensing pipeline through a plurality of flue gas pipe, delivering the flue gas through a gas cooler, and a cooling pipeline, and delivering the flue gas into a cooling device, and then, cooling the flue gas is cooled down by the flue gas channel, and delivering the flue gas through the condensing pipeline;
Wherein, while condensing part of the smoke which flows out, the rest smoke which is not swirled out continues to flow forwards, enters into a gas diffusion cavity at the rear section of the dehydrator from the inner pipe of the smoke guide pipe for expansion diffusion, the natural condensation of the flue gas is realized while the volume of the flue gas is diffused, and the flue gas continuously flows forwards and flows to the condensation plate through the gap between the cold flue gas pipelines;
cold flue gas after condensation and filtration treatment by a condenser is sprayed to a condensation plate by a gas spray head and meets residual hot flue gas passing through the condensation plate (natural condensation), and the natural condensation flue gas which is not screwed out is subjected to the spraying and mixing stirring of the gas spray head, so that the natural condensation flue gas is greatly condensed and cooled, saturated water and entrained water in the cold flue gas are removed, and dehydrated and purified cold flue gas is obtained; the cold flue gas after dehydration and purification is discharged through a second gas outlet of a diffusion cavity at the rear section of the dehydrator, and the temperature of the flue gas discharged from the second gas outlet is 42-48 ℃;
the flue gas discharged from the second gas outlet is conveyed into a second heat exchanger through a gas conveying pipeline to be heated (the medium used for heating is hot water obtained after heat exchange of the first heat exchanger), the temperature of the flue gas obtained after heating is 70-85 ℃, and the flue gas after heating enters a chimney to be discharged.
The saturated water content in the flue gas after treatment in the process is reduced to below 8%, and the dust content is reduced to 8mg/Nm 3 The method has the advantages that the efficient purification treatment is obtained, the phenomena of chimney rain and white smoke plume can not occur in winter under the condition, and the smoke is greatly reducedAnd the influence on the environment.
Examples of specific applications
After wet desulfurization and wet electric dust removal, the wet content of the flue gas is higher, the temperature is lower, and when the desulfurized flue gas is discharged into the atmosphere through a chimney, supersaturated steam in the flue gas is mixed with fine particle dust, and the flue gas is condensed into mist in the air, so that the phenomenon of 'white smoke plume' of the smoke floating at the outlet of the chimney appears, and even the flue gas is condensed into 'chimney rain' nearby the chimney. Therefore, the system and the method of the invention are adopted for processing, and the method is as follows:
firstly, carrying out conventional denitration treatment on flue gas generated by an alkali furnace, then leading out the flue gas by virtue of a draught fan, entering a dry electric dust collector through a gas conveying pipeline to carry out dry electric dust collection, conveying the flue gas after the dry electric dust collection to a first heater (the first heater is an MGGH desuperheater, the size is 2180 x 3435 x 4660, the material is ND steel) through the gas conveying pipeline, carrying out heat exchange with medium water in a first heater tube bundle, and reducing the temperature to 105 ℃;
The flue gas cooled to 105 ℃ enters a desulfurizing tower from a first heat exchanger to carry out conventional strong alkali wet desulfurization treatment, the temperature of the flue gas at the outlet of the desulfurizing tower is 60 ℃ after the wet desulfurization treatment, and then the flue gas is conveyed into a wet electric dust collector (WESP) from a gas conveying pipeline to carry out conventional wet electrostatic dust collection treatment, wherein the temperature of the flue gas after dust collection is 58 ℃;
delivering the flue gas after desulfurization and wet electric dust removal to a flue gas dehydrator through a gas delivery pipeline, enabling the flue gas to reach a flue gas collecting shell through a flue gas channel of a front shell of the flue gas dehydrator, enabling the flue gas to enter the flue gas collecting shell from a flue gas inlet end of the flue gas collecting shell, compressing the flue gas through the flue gas collecting shell and enabling the flue gas to enter a flue gas guiding pipe inner pipe, enabling the flue gas to generate a rotational flow effect when reaching a rotational flow plate of the flue gas guiding pipe inner pipe, enabling part of the flue gas to rotate out through a flue gas through hole arranged on a pipe wall of the flue gas guiding pipe inner pipe, enabling the rotated flue gas to enter a filler layer of a second condensing chamber for preliminary condensation, enabling the flue gas after preliminary condensation to enter a third gas cavity and a fourth gas cavity through a condensing net layer,then the flue gas discharged from the exhaust port is discharged from the exhaust port arranged on the outer pipe wall of the flue pipe under the action of the exhaust fan (namely, the quantity of the flue gas discharged from the cyclone can be controlled to be 35-45% of the total volume of the flue gas entering the inner pipe of the flue pipe in the treatment process), the flue gas discharged from the exhaust port is discharged from the female port of the exhaust port of the front section of the dehydrator, and then is discharged from the female port of the exhaust port of the front section of the shell, and enters the condenser through the gas conveying pipeline to be condensed and dedusted (the adopted condenser is a conventional pipe type condenser with a filtering device), the temperature of the flue gas discharged from the gas outlet of the condenser is 40+/-3 ℃, the water content is lower than 8%, and the dust content is lower than 8mg/Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the The flue gas exhausted by the condenser enters the cold flue gas pipeline through a gas conveying pipeline and a cold flue gas pipeline inlet, and is sprayed to the condensing plate through a plurality of gas spray heads arranged on the cold flue gas pipeline; meanwhile, the smoke which is not swirled out of the inner tube of the smoke guide tube continuously flows forwards along the inner tube of the smoke guide tube, and is diffused in the gas diffusion cavity after reaching the rear section of the dehydrator to obtain natural condensation, the smoke continuously flows forwards after natural condensation to reach the condensing plate, the condensing plate is mixed and stirred with the gas sprayed out of the gas spray head to further reduce the temperature, saturated water in the smoke is further condensed and discharged after being sprayed and stirred, the saturated water is condensed on the condensing plate, and the water on the condensing plate enters the water collecting tank and is discharged through the drain pipe;
the flue gas after stirring and mixing and condensing at the condensing plate is discharged from a second gas outlet on a gas diffusion cavity at the rear section of the dehydrator, the temperature of the flue gas discharged from the second gas outlet is 42-45 ℃, the saturated water content is reduced to below 8%, and the dust content is reduced to 5mg/Nm 3 The following are set forth;
in the process, 20 smoke guide pipes are arranged in the front section shell, and the size of the smoke collecting shell in each smoke guide pipe is as follows (outer diameter of inlet end), the inner tube of smoke guide tube has a size of +.>(outer diameter) of the smoke guide pipe outer pipe(outer diameter) of 316L, 2 exhaust fans used in the process, and the flow rate of each fan is 40000Nm 3 And/h, the pressure of a single fan is 3.265KPa.
Because the flue gas discharged from the second gas outlet is conveyed to the second heat exchanger (the second heat exchanger is an MGGH heater with the size of 4050 x 4500 x 1800, the heating pipe is made of DuPont fluoroplastic in U.S.), the heating medium in the second heater is hot water (conveyed by the water circulating pump with the flow rate of 50 m) after heat exchange of the first heater 3 And/h), heating the flue gas passing through the second heater to 80+/-5 ℃, conveying the flue gas to the inlet of the chimney through a gas conveying pipeline, and discharging the flue gas through the chimney, so that the flue gas is treated, and no white smoke plume and chimney rain phenomenon are generated when the flue gas is discharged through the chimney.
The annual running cost of the system and the treatment method is 76.66 ten thousand yuan, which is lower than the annual treatment cost 152.95 ten thousand yuan of the prior method by half; the total cost of the engineering is 800 ten thousand yuan, which is reduced by nearly half compared with 1560 ten thousand yuan in the prior art. Namely, the flue gas dehydration system and the flue gas dehydration method complete thorough dehydration of flue gas under the conditions of low cost and first consumption, eliminate the generation of chimney rain and white smoke plume, reduce the influence on environment and the like, and have remarkable social and economic benefits.
Claims (10)
1. The flue gas dehydrator is characterized by comprising a dehydrator front section and a dehydrator rear section, wherein the dehydrator front section is communicated with the dehydrator rear section; the front section of the dehydrator comprises a smoke channel, a front section shell, a supporting plate arranged at the front end inside the front section shell and a smoke guide pipe arranged inside the front section shell, wherein the front end of the smoke guide pipe is fixedly connected with the supporting plate, and the rear end of the smoke guide pipe is fixedly connected with the rear section of the dehydrator; the smoke guide pipe comprises a smoke collection shell, a smoke guide pipe inner pipe and a smoke guide pipe outer pipe, wherein the smoke collection shell is a hollow reducing pipe, the diameter of a smoke inlet end of the smoke collection shell is larger than that of a smoke outlet end, the smoke outlet end of the smoke collection shell is fixedly connected with the smoke inlet end of the smoke guide pipe inner pipe, the smoke inlet end of the smoke collection shell is fixedly connected with the front end of the smoke guide pipe outer pipe, a first cavity is formed by the smoke collection shell, the pipe wall of the smoke guide pipe inner pipe and the pipe wall of the smoke guide pipe outer pipe, and a cyclone plate is fixedly arranged in the smoke guide pipe inner pipe; the rear end of the smoke channel is communicated with the smoke inlet end of the smoke collecting shell, the front shell is provided with an extraction opening female opening, the wall of the inner tube of the smoke guide tube is provided with a plurality of smoke through holes, and the wall of the outer tube of the smoke guide tube is provided with a plurality of extraction openings;
The rear section of the dehydrator comprises a gas diffusion cavity, and a second gas outlet is arranged on the gas diffusion cavity; the middle and rear ends of the inside of the gas diffusion cavity are sequentially provided with a cold smoke pipeline and a condensing plate, and the cold smoke pipeline is provided with a plurality of gas spray heads;
the extraction opening female port is communicated with the exhaust fan through a gas conveying pipeline, the exhaust fan is communicated with the condenser through the gas conveying pipeline, and the condenser is communicated with the inlet of the cold smoke pipeline through the gas conveying pipeline.
2. The flue gas dehydrator according to claim 1, wherein the first cavity is a first condensation chamber, the first condensation chamber comprises a condensation mesh layer arranged around the outside of the inner pipe wall of the flue pipe, and further comprises a filler layer arranged between the inner pipe wall of the flue pipe and the condensation mesh layer and a second gas cavity formed between the condensation mesh layer and the outer pipe wall of the flue pipe; the filler layer is made of hollow metal particles, hollow plastic particles, rock particles easy to absorb water or activated carbon particles, the condensing net layer is a porous condensing net or a grid condensing net, and the filler layer is made of metal, plastic pp or glass fiber reinforced plastic plate; and an extraction opening is arranged on the wall of the outer tube of the smoke guide tube corresponding to the second gas cavity.
3. The flue gas dehydrator according to claim 1, wherein the front end of the inner pipe of the flue gas guiding pipe is provided with an annular supporting plate, the annular supporting plate is arranged in a cavity formed by the pipe wall of the inner pipe of the flue gas guiding pipe and the pipe wall of the outer pipe of the flue gas guiding pipe, the inner diameter of the annular supporting plate is consistent with the outer diameter of the inner pipe of the flue gas guiding pipe, and the outer diameter of the annular supporting plate is consistent with the inner diameter of the outer pipe of the flue gas guiding pipe; the annular supporting plate divides the first cavity into a third gas cavity and a second condensation chamber, and the second condensation chamber comprises a condensation net layer arranged around the inner pipe of the smoke guide pipe, a filler layer arranged between the inner pipe wall of the smoke guide pipe and the condensation net layer, and a fourth gas cavity formed between the condensation net layer and the outer pipe wall of the smoke guide pipe; the annular supporting plate is provided with a through hole, the through hole enables a third gas cavity to be communicated with a fourth gas cavity, and the outer pipe wall of the smoke guide pipe corresponding to the third gas cavity and the fourth gas cavity is provided with an extraction opening;
the material of the packing layer is hollow metal particles, hollow plastic particles, rock particles easy to absorb water or activated carbon particles, the condensing net layer is a porous condensing net or a grid condensing net, and the material of the condensing net layer is metal, plastic pp or glass fiber reinforced plastic plate.
4. The flue gas dehydrator according to claim 1, wherein said dehydrator front section is detachably connected to said dehydrator rear section; the inner tube of the smoke guide tube is a round tube, a regular polygonal tube with the number of sides being 4 or more or an irregular polygonal tube with the number of sides being 4 or more, and the outer tube of the smoke guide tube is a round tube, a regular polygonal tube with the number of sides being 4 or more or an irregular polygonal tube with the number of sides being 4 or more; the end part of the smoke outlet end of the smoke collecting shell is fixedly connected with the end part of the smoke inlet end of the smoke guide pipe inner pipe in a matching way, and the end part of the smoke inlet end of the smoke collecting shell is fixedly connected with the end part of the front end of the smoke guide pipe outer pipe in a matching way; the gas spray heads on the cold flue gas pipeline face the condensing plate, the water collecting tank is arranged at the bottom of the condensing plate and communicated with the drain pipe, and the condensing plate is a porous condensing net or a grid condensing net and is made of metal, plastic pp or glass fiber reinforced plastic plates.
5. A flue gas dehydration system comprising the flue gas dehydrator of any one of claims 1 to 4, characterized in that the system comprises a flue gas generating device, an induced draft fan, a first dust remover, a first heat exchanger, a desulfurizing tower, a second dust remover, a flue gas dehydrator, a second heat exchanger and a chimney; the flue gas outlet of flue gas output device is linked together through gas delivery pipeline draught fan, the draught fan is linked together through the import of gas delivery pipeline and first dust remover, the export of first dust remover is linked together through gas delivery pipeline and the gas inlet of first heat exchanger, the gas outlet of first heat exchanger is linked together through gas delivery pipeline and desulfurizing tower's gas inlet, the gas outlet of desulfurizing tower is linked together through gas delivery pipeline and the gas inlet of second dust remover, the gas outlet of second dust remover is linked together through gas delivery pipeline and the flue gas passageway of flue gas dehydrator, the second gas outlet of flue gas dehydrator is linked together through the gas inlet of gas delivery pipeline second heat exchanger, the gas outlet of second heat exchanger is linked together through gas delivery pipeline and the gas inlet of chimney.
6. The flue gas dehydration system of claim 5, wherein said first dust collector is a dry dust collector and said second dust collector is a wet dust collector; the first heat exchanger is a cooler and is used for cooling the flue gas; the second heat exchanger is a heater and is used for heating the flue gas after water removal and purification; the circulating water outlet of the first heat exchanger is communicated with the circulating water inlet of the second heat exchanger.
7. A method of dewatering flue gas using the flue gas dewatering system of claim 5, the method comprising:
conveying the flue gas generated by the flue gas generating device into a first dust remover through a gas conveying pipeline by an induced draft fan for dust removal treatment, and conveying the flue gas into a first heat exchanger through the gas conveying pipeline for cooling treatment;
delivering the cooled flue gas into a desulfurizing tower through a gas delivery pipeline for desulfurization treatment, and delivering the desulfurized flue gas into a second dust remover through the gas delivery pipeline for dust removal treatment;
conveying the flue gas subjected to dust removal by the second dust remover to a flue gas dehydrator through a gas conveying pipeline for dehydration treatment;
And conveying the dehydrated flue gas to a second heat exchanger through a gas conveying pipeline for heating, and conveying the heated flue gas to a gas inlet of a chimney through the gas conveying pipeline for discharging.
8. The method for dehydrating flue gas according to claim 7, wherein the exchange medium of the first heat exchanger is water, and the temperature of the flue gas after the flue gas is cooled by the first heat exchanger is 90-110 ℃; the flue gas temperature of the flue gas outlet of the desulfurizing tower is 44-60 ℃; the temperature of the flue gas after the dust removal by the second dust remover is 45-60 ℃; the temperature of the flue gas heated by the second heat exchanger is 70-85 ℃, and the flue gas is discharged from a chimney after being heated.
9. The method of dewatering flue gas according to claim 7, wherein the dewatering of the flue gas by a dewaterer comprises:
delivering the dust-removed flue gas to a flue gas channel at the front section of the dehydrator through a gas delivery pipeline, entering the flue gas channel, then entering the flue gas collecting shell from the flue gas inlet end of the flue gas collecting shell, compressing the flue gas collecting shell and entering the flue gas collecting inner pipe, performing rotational flow rotation at a rotational flow plate in the flue gas collecting inner pipe, and enabling a part of the flue gas to spiral out of the flue gas collecting inner pipe through a flue gas through hole arranged on the pipe wall of the flue gas collecting inner pipe and enter a filler layer for preliminary condensation; the smoke which is not screwed out flows forwards along the inner pipe of the smoke guide pipe and enters the gas diffusion cavity at the rear section of the dehydrator;
The flue gas which is cyclone-separated in the dehydrator enters the second gas cavity or the third gas cavity and the fourth gas cavity through the packing layer under the suction action of the exhaust fan, and is discharged from the exhaust opening arranged on the outer pipe wall of the flue pipe and enters the front section of shell; the flue gas in the front section shell is conveyed to the condenser for condensation through the front section shell air extraction opening female opening, the gas conveying pipeline and the exhaust fan; the condensed flue gas enters the cold flue gas pipeline through a condenser outlet, a gas conveying pipeline and a cold flue gas pipeline inlet, and is sprayed to a condensing plate through a gas spray nozzle arranged on the cold flue gas pipeline;
meanwhile, after the unthreaded flue gas reaches the gas diffusion cavity, the volume is rapidly expanded and diffused to be increased, so that natural condensation and partial condensate water precipitation are obtained in the flue gas; natural condensation is obtained through diffusion, then the natural condensation is continuously carried out to reach the condensing plate, and the natural condensation is mixed and stirred with cold flue gas sprayed out of a cold flue gas pipeline, so that the whole flue gas is condensed, saturated water and entrained water in the flue gas are condensed into liquid through mixing and stirring and condensation, and the liquid is collected on the condensing plate and discharged;
and discharging the flue gas after mixed condensation and water removal through a second gas outlet at the rear section of the dehydrator, and conveying the flue gas to a second heat exchanger through a gas conveying pipeline to complete the dehydration process of the dehydrator.
10. The method for dehydrating flue gas according to claim 9, wherein a part of the flue gas which passes through the flue gas through holes arranged on the wall of the inner tube of the flue gas guide tube is screwed out of the inner tube of the flue gas guide tube to occupy 20-60% of the total volume of the flue gas, and the rest of the flue gas is the flue gas which is not screwed out; the temperature of the flue gas after condensing by the condenser is 30-45 ℃, and the temperature of the flue gas discharged by the second gas outlet of the dehydrator is 42-48 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB1469829A (en) * | 1974-09-02 | 1977-04-06 | Seitetsu Kagaku Co Ltd | Process for treating a flue gas from a furnace |
| CN201724237U (en) * | 2010-07-27 | 2011-01-26 | 张永洲 | Device for removing stack rain generated by discharge of desulfurization fume stack |
| KR101553550B1 (en) * | 2015-03-27 | 2015-09-16 | 주식회사 성지공조기술 | White plume preventing system using cooling and dehumidifying and preventing method for white plume using it |
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| CN107737493A (en) * | 2017-11-03 | 2018-02-27 | 四川省达州钢铁集团有限责任公司 | A kind of energy-saving desulfurization white cigarette governing system and method |
| CN107875800A (en) * | 2017-12-07 | 2018-04-06 | 天津华赛尔传热设备有限公司 | The flue gas to dehumidify outside a kind of tower disappears white system |
| CN208511904U (en) * | 2018-05-16 | 2019-02-19 | 程伟良 | A kind of fume-dehydrating device |
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2018
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| GB1469829A (en) * | 1974-09-02 | 1977-04-06 | Seitetsu Kagaku Co Ltd | Process for treating a flue gas from a furnace |
| CN201724237U (en) * | 2010-07-27 | 2011-01-26 | 张永洲 | Device for removing stack rain generated by discharge of desulfurization fume stack |
| KR101553550B1 (en) * | 2015-03-27 | 2015-09-16 | 주식회사 성지공조기술 | White plume preventing system using cooling and dehumidifying and preventing method for white plume using it |
| CN106474860A (en) * | 2015-08-25 | 2017-03-08 | 贺方昀 | Wet desulfurization flue gas processing system and processing method |
| CN107737493A (en) * | 2017-11-03 | 2018-02-27 | 四川省达州钢铁集团有限责任公司 | A kind of energy-saving desulfurization white cigarette governing system and method |
| CN107875800A (en) * | 2017-12-07 | 2018-04-06 | 天津华赛尔传热设备有限公司 | The flue gas to dehumidify outside a kind of tower disappears white system |
| CN208511904U (en) * | 2018-05-16 | 2019-02-19 | 程伟良 | A kind of fume-dehydrating device |
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| CN108654221A (en) | 2018-10-16 |
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