CN109224786B - Smoke induced mixed air white smoke elimination system and white smoke elimination method - Google Patents
Smoke induced mixed air white smoke elimination system and white smoke elimination method Download PDFInfo
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- CN109224786B CN109224786B CN201811300825.XA CN201811300825A CN109224786B CN 109224786 B CN109224786 B CN 109224786B CN 201811300825 A CN201811300825 A CN 201811300825A CN 109224786 B CN109224786 B CN 109224786B
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- 239000000779 smoke Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008030 elimination Effects 0.000 title claims 7
- 238000003379 elimination reaction Methods 0.000 title claims 7
- 238000002347 injection Methods 0.000 claims abstract description 54
- 239000007924 injection Substances 0.000 claims abstract description 54
- 238000002156 mixing Methods 0.000 claims abstract description 53
- 230000002087 whitening effect Effects 0.000 claims abstract description 46
- 239000007788 liquid Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000001816 cooling Methods 0.000 claims abstract description 31
- 238000009792 diffusion process Methods 0.000 claims abstract description 28
- 238000005507 spraying Methods 0.000 claims abstract description 14
- 239000007921 spray Substances 0.000 claims abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 148
- 239000003546 flue gas Substances 0.000 claims description 144
- 239000000428 dust Substances 0.000 claims description 28
- 239000007789 gas Substances 0.000 claims description 18
- 238000009825 accumulation Methods 0.000 claims description 6
- 239000003595 mist Substances 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 16
- 238000009833 condensation Methods 0.000 abstract description 5
- 230000005494 condensation Effects 0.000 abstract description 5
- 230000006911 nucleation Effects 0.000 abstract description 4
- 238000010899 nucleation Methods 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 2
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- MXWHMTNPTTVWDM-NXOFHUPFSA-N mitoguazone Chemical compound NC(N)=N\N=C(/C)\C=N\N=C(N)N MXWHMTNPTTVWDM-NXOFHUPFSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
-
- 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
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- 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)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a smoke injection air mixing and whitening system and a whitening method. The smoke injection air mixing and whitening system comprises a shell, wherein a smoke inlet and a smoke outlet are formed in the shell, an ejector, a water and liquid removing device and a demisting and dedusting device are sequentially arranged in the shell along the airflow direction, the demisting and dedusting device is communicated with the smoke outlet, the ejector comprises a nozzle, a receiving chamber, a mixing chamber and a diffusion chamber which are sequentially arranged along the airflow direction, the diffusion chamber is further provided with a spraying device or a plurality of air inlets, the air inlets are inlets of secondary cooling air, and a drainage device is arranged at the bottom of the ejector. The method for eliminating white smoke carries out secondary cold air mixing after primary air mixing, reduces the temperature of the smoke and increases the supersaturation degree, or sprays a small amount of cooling fog drops, thereby effectively increasing nucleation seed crystals required by condensation of the smoke, effectively enhancing the effect of condensation nucleation of the smoke and finally improving the effect of eliminating white smoke.
Description
Technical Field
The invention relates to a smoke injection air mixing and whitening system and a whitening method.
Background
At present, a great amount of white smoke still exists after desulfurization and denitrification of flue gas discharged by a power plant boiler, an industrial kiln and the like, water vapor in the flue gas is basically in a saturated state after wet desulfurization, the moisture content is high, the temperature of the flue gas is reduced in the process of mixing and diffusing with the atmosphere in the discharging process, water in the flue gas is exposed and separated out, and white fog commonly called 'smoke plume' is formed at the periphery of a chimney. The discharged flue gas has high moisture content, can not be effectively diffused due to corrosion to a chimney, promotes the formation of haze, and causes pollution to the life and vision of citizens.
In the prior art route, a flue gas cooling device is added at a desulfurization outlet to reduce the dew point of flue gas, and then a flue gas heating device is arranged at the flue gas outlet to improve the temperature of dry balls of the flue gas, or an MGGH circulating heat exchange system is adopted to cool and reheat or a steam heating system is directly adopted to realize the temperature rising and whitening of the flue gas. The prior art all needs to adopt huge heat exchange equipment, consumes a large amount of heat energy in the operation process, has high requirements on equipment materials in general and has high corrosion performance, and the flue gas is desulfurized, denitrated and dedusted basically without residual pressure, and a booster fan is required to be added. Therefore, the technical problem to be solved is that a novel whitening process is needed for industrial flue gas whitening to solve the defects.
The patent document of China with the application number 201810262315.1 discloses a system and a method for recovering white smoke and eliminating white smoke by boosting and cooling flue gas of a thermal power plant, wherein cold air and desulfurized flue gas are mixed by adopting an injection method, and the cold air flue gas is directly mixed once to be difficult to condense water, so that a demister is required to be arranged at an air inlet, and meanwhile, a condensing pipe is required to be matched for cooling and condensing to meet the requirements.
Disclosure of Invention
The invention aims to solve the technical problems of industrial flue gas whitening, overcomes the defects of excessively high energy consumption, large occupied area, large investment and high operation cost of a whitening system in the prior art, and provides a novel flue gas injection air mixing whitening system and a whitening method.
The invention solves the technical problems by the following technical scheme:
the invention provides a smoke injection air mixing and whitening system, which comprises a shell, wherein a smoke inlet and a smoke outlet are arranged on the shell, and an injector, a water and liquid removing device and a demisting and dedusting device are sequentially arranged in the shell along the airflow direction;
the ejector comprises a nozzle, a receiving chamber, a mixing chamber and a diffusion chamber, wherein the receiving chamber, the mixing chamber and the diffusion chamber are sequentially arranged along the airflow direction, the nozzle is an inlet for primary ejection of main air, the nozzle is arranged in the receiving chamber, the receiving chamber is communicated with the flue gas inlet, an outlet of the diffusion chamber is communicated with the water and liquid removing device, the diffusion chamber is also provided with a spraying device or a plurality of air inlets, and the air inlets are inlets for secondary cooling air;
And a drainage device is arranged at the bottom of the ejector.
The quantity of the air inducing ports can be set according to actual conditions, and preferably, the quantity of the air inducing ports is 1-2.
Preferably, the water and liquid collecting device comprises a bracket, a baffle plate, a liquid collecting baffle plate and a flow guide pipe, wherein the baffle plate is arranged on the bracket, the liquid collecting baffle plate is positioned at the lower part of an outlet of the baffle plate, and the flow guide pipe is communicated with an outlet of the liquid collecting baffle plate.
Preferably, the demisting and dedusting device is a tubular demister or a corrugated plate demister, and has a capturing function on dust while removing water, so that the dust content of outlet flue gas is reduced.
Preferably, a hot air guiding opening is further arranged between the demisting and dedusting device and the flue gas outlet, and the hot air guiding opening is a hot air inlet and is used for introducing hot air for mixing, so that the temperature of dry balls of the flue gas is improved, and the whitening effect is improved.
Preferably, a smoke baffle door is arranged in front of the nozzle and/or the air inducing opening, and the smoke baffle door can be manually adjusted according to the external environment.
The fan of primary injection main body wind adopts variable frequency adjustment, and can be automatically adjusted according to the dew point of the outlet flue gas.
The invention also provides a method for utilizing the flue gas to jet the mixed air white removing system to remove white smoke, which comprises the following steps:
(1) The flue gas enters the receiving chamber through the flue gas inlet, primary injection main body wind enters the receiving chamber through the nozzle, and the flue gas and the primary injection main body wind are mixed in the mixing chamber;
(2) Spraying mist drops on the gas mixed in the step (1) in the diffusion chamber through the spraying device;
Or, the mixed gas in the step (1) is mixed again in the diffusion chamber through the secondary cooling air;
(3) The gas after the step (2) is discharged through the water and liquid removing device, the demisting and dedusting device and the flue gas outlet in sequence;
when a hot air introducing port is arranged between the demisting and dedusting device and the flue gas outlet, in the step (3), the gas after passing through the step (2) sequentially passes through the water and liquid removing device and the demisting and dedusting device, is mixed with hot air again and is discharged through the flue gas outlet;
and (3) enabling the condensed water precipitated in the steps (1) - (3) to flow into the drainage device.
The flue gas may be industrial flue gas conventional in the art, preferably, the flue gas is industrial flue gas after desulfurization and denitrification. More preferably, the temperature of the flue gas is 55-70 ℃ (e.g. 60 ℃ and 65 ℃) and the pressure is 50-350 Pa (e.g. 100Pa, 200Pa and 300 Pa), and the volume flow is 80000-250000 Nm 3/h (e.g. 100000Nm 3/h、125000Nm3/h、200000Nm3/h).
Preferably, the primary injection main air and/or the secondary cooling air is natural cooling air, and the temperature of the natural cooling air is the temperature of outdoor air, which is usually-20-35 ℃.
Preferably, the pressure of the primary injection main air is 4000-6000 Pa (e.g. 4000Pa, 4500Pa, 5000 Pa).
Preferably, the volume flow ratio of the primary injection main body wind to the flue gas is (0.2-1.2): 1.
Preferably, the volume flow ratio of the primary injection main air to the secondary cooling air is 1 (0.2-0.8).
Preferably, the pressure of the secondary cooling air is 0.1 to 1000Pa (e.g. 300Pa, 400Pa, 500 Pa).
Preferably, the spraying medium of the spraying device is water. The temperature of the spraying medium is 10-30 ℃. The volume flow of the spraying medium is 1-10 m 3/h.
Preferably, the diameter of the fog drops sprayed by the spraying device is 10-300 mu m.
The hot air source can be clean high-temperature flue gas in the original factory, or hot air heated by a steam heating or electric heating system. Preferably, the temperature of the hot air is 80 ℃ to 150 ℃ (e.g. 80 ℃ and 82 ℃). The pressure of the hot air is 100 to 500Pa (for example, 400Pa and 500 Pa). The volume flow ratio of the hot air to the flue gas is (0.2-0.5): 1.
The invention has the positive progress effects that:
The novel flue gas whitening system adopts a process route of injecting mixed air, natural cooling air is used as main fluid, industrial flue gas is used as injection fluid, the natural cooling air and hot wet industrial flue gas are directly contacted and mixed in the injection process, the dew point of the system is reduced, a large amount of condensate water is separated out in the mixing process, meanwhile, the injection mixed air system adopts secondary cooling air mixed air or a spraying device is added to spray cooling liquid, the moisture content of the flue gas is further removed, the condensate water of the flue gas is recovered in the defogging process, the defogging itself has a dust removal effect, the finally discharged flue gas is purified, and the environmental protection index is reached, so that the flue gas whitening system has important environmental protection benefit and economic benefit.
The flue gas injection mixing and whitening system is provided with a demisting and dedusting device, has a capturing function on dust while removing water, and reduces the dust content of outlet flue gas. Has important application value for treating industrial flue gas whitening and dust removal.
Drawings
Fig. 1 is a schematic structural diagram of a flue gas injection air-mixing whitening system in embodiment 1 of the present invention;
FIG. 2 is an enlarged view of section A of the water and liquid trap shown in FIG. 1;
Fig. 3 is a schematic structural diagram of a flue gas injection air-mixing whitening system in embodiment 2 of the present invention;
Fig. 4 is a schematic structural diagram of a flue gas injection air-mixing whitening system in embodiment 3 of the present invention;
fig. 5 is a schematic structural diagram of a flue gas injection air-mixing whitening system in embodiment 4 of the present invention.
Reference numerals illustrate:
1-smoke inlet, 21-nozzle, 22-receiving chamber, 23-mixing chamber, 24-diffusion chamber, 3-water and liquid collecting device, 31-support, 32-baffle plate, 33-liquid collecting baffle plate, 34-flow guide pipe, 4-demisting and dust removing device, 5-smoke outlet, 6-drainage device, 7-air inlet, 8-hot air inlet and 9-shell.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
Example 1
The system for injecting, mixing and whitening industrial flue gas as shown in figures 1-2 comprises a shell 9, wherein a flue gas inlet 1 and a flue gas outlet 5 are arranged on the shell 9,
An ejector, a water and liquid removing device 3 and a demisting and dedusting device 4 are sequentially arranged in the shell 9 along the airflow direction, wherein the demisting and dedusting device 4 is communicated with the flue gas outlet 5;
the ejector comprises a nozzle 21, a receiving chamber 22, a mixing chamber 23 and a diffusion chamber 24 which are sequentially arranged along the airflow direction;
The nozzle 21 is an inlet for injecting main body air once, and the nozzle 21 is arranged in the receiving chamber 22, wherein the receiving chamber 22 is communicated with the flue gas inlet 1;
The outlet of the diffusion chamber 24 is communicated with the water and liquid removing device 3;
The diffusion chamber 24 is also provided with an air inlet 7, wherein the air inlet 7 is an inlet of secondary cooling air;
The bottom of the ejector is provided with a drainage device 6.
The water and liquid collecting device 3 comprises a bracket 31, a baffle plate 32, a liquid collecting baffle plate 33 and a flow guide pipe 34, wherein the baffle plate 32 is arranged on the bracket 31, the liquid collecting baffle plate 33 is positioned at the lower part of an outlet of the baffle plate 32, and the flow guide pipe 34 is communicated with an outlet of the liquid collecting baffle plate 32. The vapor in the air flow is condensed after passing through the baffle plate 32 and flows into the guide pipe 34 through the liquid accumulation baffle plate 33, and finally flows into the bottom drainage device 6 under the action of gravity.
This defogging dust collector 4 is the buckled plate defroster, and during the actual preparation, can select in tubular defroster and buckled plate defroster.
In actual manufacturing, the nozzle 21 and the air inlet 7 can be provided with a smoke baffle door according to the requirement, and the smoke baffle door can be manually adjusted according to the external environment.
During actual manufacturing, the fan of primary injection main body air can be adjusted by frequency conversion according to requirements, so that automatic adjustment is performed according to the dew point of the outlet flue gas.
Example 2
As shown in fig. 3, in the flue gas injection air mixing and whitening system of the embodiment, a hot air guiding port 8 is further arranged between the demisting and dedusting device 4 and the flue gas outlet 5, and the flue gas dry bulb temperature can be improved and the whitening effect can be improved by introducing hot air in front of the flue gas outlet for mixing.
Example 3
As shown in fig. 4, compared with embodiment 2, the difference is that the diffusion chamber 24 of the flue gas injection air-mixing whitening system of this embodiment is not provided with an air intake, but is provided with a spraying device 9, and the other parts are the same as those of embodiment 2.
By spraying a small amount of cooling fog drops, the nucleation seed crystal required by flue gas condensation can be effectively increased, the effect of flue gas condensation nucleation is effectively enhanced, and finally the flue gas whitening effect is improved.
Example 4
As shown in fig. 5, the flue gas injection air-mixing whitening system in this embodiment is in a horizontal direction, and the other parts are the same as those in embodiment 1 except for the placement direction.
Application example 1
The injection air mixing and whitening system of the embodiment 1 is adopted to whiten industrial flue gas, and the method comprises the following steps:
(1) The industrial wet flue gas enters the receiving chamber 22 through the flue gas inlet 1, primary injection main body wind flows out from the nozzle 21 and enters the receiving chamber 22, and momentum exchange occurs by primary injection main body wind in the receiving chamber 22 sucking surrounding flue gas due to turbulent diffusion of jet flow, and primary injection main body wind and flue gas are mixed in the mixing chamber 23 to perform momentum and mass exchange;
(2) The mixed gas is mixed again in the diffusion chamber 24 by secondary cooling air, the dew point of the flue gas in the system is further reduced, and a large amount of condensate is separated out at the same time, and the condensate flows into the drain device 6 at the bottom under the action of gravity;
(3) The outlet of the diffusion chamber 24 is provided with a water and liquid removing device 3, and the vapor of the mixed gas is defogged and separated out to form flue gas condensate, and is recycled and discharged through the water and liquid removing device 3;
(4) The gas outlet of the water and liquid removing device 3 is provided with a demisting and dedusting device 4, and the mixed gas subjected to demisting and dedusting is discharged through a flue gas outlet 5.
In the step (1), the industrial flue gas fed by the flue gas inlet 1 is saturated flue gas with the temperature of 65 ℃, the volume flow is 100000Nm 3/h, the dust content is 30mg/Nm 3, the flue gas pressure is 300Pa, the volume flow of primary injection main body air is 60000Nm 3/h, the temperature is 10 ℃, and the pressure is 4000Pa. The dew point of the flue gas is reduced to 50 ℃ after the flue gas is mixed in the step (1), and the dry bulb temperature is 58 ℃.
In step (2), the volume flow rate of the secondary cooling air was 40000Nm 3/h, and the pressure was 500pa. The temperature of the secondary cooling air was 10 ℃. The dew point of the flue gas is further reduced to 45 ℃ after the flue gas is mixed in the step (2), and the dry bulb temperature is 55 ℃.
The effect data is that the dust content in the flue gas discharged from the flue gas outlet is 5mg/Nm 3, and the flue gas dry bulb temperature discharged to the atmosphere in winter reaches 55 ℃ and the dew point is reduced to below 45 ℃. And (3) injecting the smoke at the outlet of the air mixing and whitening system at the outside air temperature below 0 ℃ to eliminate white smoke. The total discharged condensate amount of the injection air mixing and whitening system is 2.5m 3/h.
Therefore, the injection air mixing white removing system of the embodiment 1 is adopted to perform white smoke removing treatment, and the comprehensive effect of white removing and dust removing can be achieved.
Application example 2
The injection air mixing and whitening system of the embodiment 2 is adopted to whiten industrial flue gas, and the method comprises the following steps:
(1) The industrial wet flue gas enters the receiving chamber 22 through the flue gas inlet 1, primary injection main body wind flows out from the nozzle 21 and enters the receiving chamber 22, and momentum exchange occurs by primary injection main body wind in the receiving chamber 22 sucking surrounding flue gas due to turbulent diffusion of jet flow, and primary injection main body wind and flue gas are mixed in the mixing chamber 23 to perform momentum and mass exchange;
(2) The mixed gas is mixed again in the diffusion chamber 24 by secondary cooling air, the dew point of the flue gas in the system is further reduced, and a large amount of condensate is separated out at the same time, and the condensate flows into the drain device 6 at the bottom under the action of gravity;
(3) The outlet of the diffusion chamber 24 is provided with a water and liquid removing device 3, and the vapor of the mixed gas is defogged and separated out to form flue gas condensate, and is recycled and discharged through the water and liquid removing device 3;
(4) The outlet of the water and liquid removing device 3 is provided with a demisting and dedusting device 4, the mixed gas subjected to demisting and dedusting is reheated and mixed with hot air through a hot air guiding port 8, the temperature of the dry ball of the mixed flue gas is increased, and finally the mixed flue gas is discharged through a flue gas outlet 5.
In the step (1), the industrial flue gas fed by the flue gas inlet 1 is saturated flue gas with the temperature of 60 ℃, the volume flow is 200000Nm 3/h, the dust content is 35mg/Nm 3, the flue gas pressure is 200Pa, the volume flow of the primary injection main body is 100000Nm 3/h, the temperature is 20 ℃, and the pressure is 5000Pa. The dew point of the flue gas is reduced to 52 ℃ after the flue gas is mixed in the step (1), and the dry bulb temperature is 58 ℃.
In the step (2), the volume flow rate of the secondary cooling air is 50000Nm 3/h. The pressure was 300pa and the temperature of the secondary cooling air was 20 ℃. The dew point of the flue gas is further reduced to 48 ℃ after the flue gas is mixed in the step (2), and the dry bulb temperature is 55 ℃.
In the step (4), the pressure of hot air is 500pa, the temperature of the hot air is 80 ℃, the volume flow is 50000Nm 3/h, and the temperature of the flue gas dry bulb after reheating and mixing is increased to 62 ℃.
The effect data is that the dust content in the flue gas discharged from the flue gas outlet is 5mg/Nm 3, and the dry bulb temperature of the flue gas discharged to the atmosphere in winter reaches 62 ℃ and the dew point is reduced to below 48 ℃. And at the outside air temperature of 0 ℃, injecting the smoke at the outlet of the air mixing and whitening system to eliminate white smoke. The total discharged condensate water of the injection air mixing and whitening system is 3.8m 3/h.
Therefore, the injection air mixing white removing system of the embodiment 2 is adopted to perform white smoke removing treatment, so that the comprehensive effect of white removing and dust removing can be achieved.
Application example 3
The injection air mixing and whitening system of the embodiment 3 is adopted to whiten industrial flue gas, and the method comprises the following steps:
(1) The industrial wet flue gas enters the receiving chamber 22 through the flue gas inlet 1, primary injection main body wind flows out from the nozzle 21 and enters the receiving chamber 22, and momentum exchange occurs by primary injection main body wind in the receiving chamber 22 sucking surrounding flue gas due to turbulent diffusion of jet flow, and primary injection main body wind and flue gas are mixed in the mixing chamber 23 to perform momentum and mass exchange;
(2) The mixed gas sprays fog drops in the diffusion chamber 24 through the high-efficiency spray pipe of the spray device 9 to form crystalline nucleus for condensing vapor, so that the condensing effect of the flue gas is improved, the dew point of the flue gas of the system is further reduced, and a large amount of condensed water is separated out;
(3) The outlet of the diffusion chamber 24 is provided with a water and liquid removing device 3, and the vapor of the mixed gas is defogged and separated out to form flue gas condensate, and is recycled and discharged through the water and liquid removing device 3;
(4) The outlet of the water and liquid removing device 3 is provided with a demisting and dedusting device 4, the mixed gas subjected to demisting and dedusting is reheated and mixed with hot air through a hot air guiding port 8, the temperature of the dry ball of the mixed flue gas is increased, and finally the mixed flue gas is discharged through a flue gas outlet 5.
In the step (1), the industrial flue gas fed by the flue gas inlet 1 is saturated flue gas with the temperature of 60 ℃, the volume flow is 200000Nm 3/h, the dust content is 35mg/Nm 3, the flue gas pressure is 200Pa, the volume flow of the primary injection main body is 100000Nm 3/h, the temperature is 20 ℃, and the pressure is 5000Pa. The dew point of the flue gas is reduced to 52 ℃ after the flue gas is mixed in the step (1), and the dry bulb temperature is 58 ℃.
In the step (2), the volume flow rate of the spray liquid is 3m 3/h. The spray liquid is cooling water, the temperature is 20 ℃, and the diameter of mist droplets formed by atomization is 10-300 mu m. The dew point of the flue gas is further reduced to 46 ℃ after the flue gas is sprayed in the step (2), and the dry bulb temperature is 54 ℃.
In the step (4), the pressure of hot air is 400pa, the temperature of hot air is 82 ℃, the volume flow is 50000Nm 3/h, and the temperature of the flue gas dry bulb after mixed reheating is increased to 64 ℃.
The effect data is that the dust content in the flue gas discharged from the flue gas outlet is 5mg/Nm 3, and the dry bulb temperature of the flue gas discharged to the atmosphere in winter reaches 64 ℃ and the dew point is reduced to below 49 ℃. And at the outside air temperature of 0 ℃, injecting the smoke at the outlet of the air mixing and whitening system to eliminate white smoke. The total discharged condensation water amount of the injection air mixing and whitening system is 5.5m 3/h.
Therefore, the injection air mixing white removing system of the embodiment 3 is adopted to perform white smoke removing treatment, and the comprehensive effect of white removing and dust removing can be achieved.
Application example 4
The injection air mixing and whitening system of the embodiment 4 is adopted to whiten industrial flue gas, and the specific steps are the same as those of the application embodiment 1.
In the step (1), the industrial flue gas fed by the flue gas inlet 1 is saturated flue gas with the temperature of 65 ℃, the volume flow is 125000Nm 3/h, the dust content is 35mg/Nm 3, the flue gas pressure is 100Pa, the volume flow of primary injection main body wind is 75000Nm 3/h, the temperature is 15 ℃, and the pressure is 4500Pa. The dew point of the flue gas is reduced to 51 ℃ after the flue gas is mixed in the step (1), and the dry bulb temperature is 56 ℃.
In step (2), the volume flow rate of the secondary cooling air was 50000Nm 3/h and the pressure was 400pa. The temperature of the secondary cooling air was 15 ℃. The dew point of the flue gas is further reduced to 45 ℃ after the flue gas is mixed in the step (2), and the dry bulb temperature is 55 ℃.
The effect data is that the dust content in the flue gas discharged from the flue gas outlet is 8mg/Nm 3, and the flue gas dry bulb temperature discharged to the atmosphere in winter reaches 55 ℃ and the dew point is reduced to below 45 ℃. And at the outside air temperature of 0 ℃, injecting the smoke at the outlet of the air mixing and whitening system to eliminate white smoke. The total discharged condensate amount of the injection air mixing and whitening system is 2.8m 3/h.
Therefore, the injection air mixing white removing system of the embodiment 4 is adopted to perform white smoke removing treatment, and the comprehensive effect of white removing and dust removing can be achieved.
Comparative example 1
Compared with the embodiment 1, the difference is that the diffusion chamber 24 of the smoke injection air-mixing and whitening system of the comparative example is not provided with an air inlet, no secondary cooling air is introduced in the whitening process, and other operations and parameters are the same as those of the embodiment 1.
Effect data:
The flue gas discharged from the flue gas outlet has the dust content of 8mg/Nm 3, the dew point of 48 ℃ and the dry bulb temperature of 54 ℃, and almost no flue gas condensate is separated out in the step (3). At the outside air temperature of 0 ℃, a large amount of white smoke exists in the outlet smoke of the injection air mixing white removing system. Therefore, secondary air mixing and mist spraying are not carried out by secondary cooling air, and the effect of whitening and dedusting the smoke is poor only by primary air mixing.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (9)
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| CN110124465B (en) * | 2019-05-15 | 2021-09-21 | 杭州蕴泽环境科技有限公司 | Low-energy-consumption wet flue gas water-receiving and white-removing device and method |
| CN110368794B (en) * | 2019-07-22 | 2022-04-08 | 浙江宏电环保股份有限公司 | Flue gas multistage formula disappears and whitewashes device |
| CN110314501A (en) * | 2019-08-02 | 2019-10-11 | 南京意西欧环境科技有限公司 | A kind of dynamic interception eliminating white smoke system and eliminating white smoke method |
| CN110345503B (en) * | 2019-08-23 | 2020-09-29 | 山东保蓝环保工程有限公司 | Flue gas whitening equipment and system for chemical plant exhaust chimney |
| CN111023846A (en) * | 2019-11-25 | 2020-04-17 | 中冶重工（唐山）有限公司 | Dust and white removing device for head of sintering secondary mixer |
| CN110935279A (en) * | 2019-12-19 | 2020-03-31 | 济宁明升新材料有限公司 | Heat pump type white smoke eliminating device and method thereof |
| CN111495095B (en) * | 2020-06-03 | 2025-03-28 | 沈阳鑫博工业技术股份有限公司 | A dust removal device suitable for high temperature and high humidity environment and a method of using the same |
| CN112524623A (en) * | 2020-12-17 | 2021-03-19 | 江苏双良低碳产业技术研究院有限公司 | Air mixing device and chimney system comprising same |
| CN113144841B (en) * | 2021-02-22 | 2022-08-23 | 中国石油天然气集团有限公司 | Method for eliminating rain and white smoke |
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