CN107191956B - Flue gas purifying system - Google Patents
Flue gas purifying system Download PDFInfo
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- CN107191956B CN107191956B CN201710609175.6A CN201710609175A CN107191956B CN 107191956 B CN107191956 B CN 107191956B CN 201710609175 A CN201710609175 A CN 201710609175A CN 107191956 B CN107191956 B CN 107191956B
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- flue gas
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- smoke
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 226
- 239000003546 flue gas Substances 0.000 title claims abstract description 226
- 239000007789 gas Substances 0.000 claims abstract description 51
- 239000000779 smoke Substances 0.000 claims description 42
- 239000003517 fume Substances 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 10
- 239000003595 mist Substances 0.000 claims 2
- 238000000746 purification Methods 0.000 abstract description 43
- 238000010438 heat treatment Methods 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 238000000034 method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000002745 absorbent Effects 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- -1 absorption method Chemical compound 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/15081—Reheating of flue gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a flue gas purification system. The flue gas purification system at least comprises a first reactor and a second reactor, and further comprises a heat exchanger, wherein an outlet of a first gas channel of the heat exchanger is communicated with a flue gas inlet of the first reactor, a flue gas discharge port of the first reactor is communicated with a flue gas inlet of the second reactor, and a flue gas discharge port of the second reactor is communicated with an inlet of a second gas channel of the heat exchanger. Thus, the high-temperature flue gas exhausted by the flue gas production equipment can be subjected to heat exchange with the low-temperature flue gas exhausted by the reactor through the heat exchanger, the temperature of the high-temperature flue gas is reduced, and the temperature of the low-temperature flue gas is increased. The flue gas purification system is utilized, equipment for heating low-temperature flue gas is not required to be arranged independently, the high-temperature flue gas is not required to be cooled by additionally arranging a cooler, the structure of the flue gas purification system can be simplified, and the equipment investment, the operation cost and the energy consumption are reduced.
Description
Technical Field
The invention relates to a flue gas purification technology, in particular to a flue gas purification system.
Background
At present, smoke gas is generated by smoke gas production equipment such as thermal power generation, metal smelting and the like due to coal-fired fuel; the flue gas contains SO 2 And NOx, etc., which have formed a major source of atmospheric pollution.
At present, there are various methods for purifying flue gas, including absorption method, adsorption method, catalytic conversion method, biological method, plasma method, etc., according to different principles. Wherein, the absorption method is the most commonly used mode, the main principle is that pollutants in the flue gas are separated by absorption, thereby removing SO 2 And pollutants such as NOx.
The existing flue gas purification system using an absorption method is provided with a flue gas purification reactor, flue gas to be purified and a proper absorbent are introduced into the reactor, in the reactor, the absorbent contacts and reacts with the flue gas, pollutants in the flue gas are absorbed, the flue gas is purified, and then the purified flue gas is discharged or subjected to other treatments; the absorbed pollutant can be treated harmlessly or recovered correspondingly. Chinese patent document CN 1156332C discloses a multiphase flue gas purifying reactor, which comprises a flue gas purifying reactor shell, and a conical structure member used by a conical ring and a cone in cooperation is installed in the shell, so as to promote the mixing contact and reaction of flue gas and absorbent.
In order to avoid liquefying the water in the purified exhaust flue gas, the purified flue gas is often required to be heated before being exhausted, so that the water in the flue gas is exhausted in a gaseous form; the corresponding heating equipment is needed to be arranged for heating; this heating equipment that sets up not only makes flue gas purification system structure more complicated, increases equipment cost input, still leads to flue gas purification system operation cost and energy consumption to increase.
Disclosure of Invention
The invention aims to provide a flue gas purification system which not only can reduce equipment investment, but also can reduce the operation cost of the flue gas purification system and reduce the energy consumption of the flue gas purification system.
Based on the above object, the flue gas purification system provided by the invention at least comprises a first reactor and a second reactor, and further comprises a heat exchanger, wherein the heat exchanger at least comprises a first gas channel and a second gas channel which are isolated by a heat exchange medium; the outlet of the first gas channel is communicated with the flue gas inlet of the first reactor, the flue gas discharge port of the first reactor is communicated with the flue gas inlet of the second reactor, and the flue gas discharge port of the second reactor is communicated with the inlet of the second gas channel. In this way, the high-temperature flue gas exhausted by the flue gas production equipment can firstly enter the first gas channel of the heat exchanger; meanwhile, low-temperature flue gas exhausted from a flue gas exhaust port of the second reactor passes through a second gas channel of the heat exchanger, so that heat exchange can be performed on high-temperature flue gas and low-temperature flue gas through the heat exchanger, the temperature of the high-temperature flue gas is reduced, and the temperature of the low-temperature flue gas is increased. Therefore, the flue gas purification system does not need to be provided with equipment for heating low-temperature flue gas independently, so that the structure of the flue gas purification system can be simplified, and the equipment investment, the operation cost and the energy consumption are reduced. In addition, the high-temperature flue gas temperature is reduced, so that the evaporation of water in the purification reaction process can be reduced, the water consumption is saved, the water content of the purified flue gas is reduced, the corrosion of the flue gas to equipment is reduced, and the defogging requirement before the flue gas emission is reduced.
In a further alternative technical scheme, the flue gas purification system further comprises a flue gas exhaust pipeline; the heat exchanger comprises a heat exchange medium pipeline positioned in the smoke exhaust pipeline, wherein the heat exchange medium pipeline is internally provided with the first gas channel, and the heat exchange medium pipeline is externally provided with a second gas channel; the flue gas discharge port of the second reactor is communicated with the flue gas discharge pipeline, and the flue gas discharge port of the second reactor is communicated with the inlet of the second gas channel through the flue gas discharge pipeline. The heat exchanger is arranged in the smoke exhaust pipeline, so that the structure of the smoke purification system can be further simplified, the heat of high-temperature smoke is more fully utilized, and the comprehensive effects of energy conservation, purification efficiency and the like of the smoke purification system are improved.
In a further technical scheme, the smoke exhaust pipeline is arranged at the upper part of the second reactor, and a smoke exhaust port of the second reactor is communicated with the lower part of the smoke exhaust pipeline. The exhaust gas pipeline and the second reactor are arranged together, so that the integration level of the smoke gas purifying system can be improved, and the occupied area of the smoke gas purifying system is saved.
In a further technical scheme, the upper end of the smoke exhaust pipeline is communicated with the atmosphere to form a chimney; therefore, a special chimney is saved, and the manufacturing cost of the flue gas purification system is reduced.
In a further technical scheme, the flue gas inlet of the second reactor is positioned in the flue gas exhaust pipeline; the device also comprises an intermediate flue; one end of the middle flue is connected with the smoke discharge port of the first reactor, and the other end of the middle flue extends into the smoke discharge pipeline to be connected with the smoke inlet of the second reactor. Thus, the smoke exhaust pipeline (chimney) can be combined with the reactor, and the structural compactness of the smoke purification system is improved.
In a further technical scheme, the flue gas discharge port of the second reactor is positioned at the lower part; the device also comprises a smoke discharge branch pipe, wherein the lower end of the smoke discharge branch pipe is communicated with a smoke discharge port of the second reactor, and the upper end of the smoke discharge branch pipe is communicated with the lower part of the smoke discharge pipeline.
In the preferred technical scheme, the device comprises a plurality of flue gas discharge branch pipes positioned outside the second reactor, and the flue gas discharge branch pipes are distributed on the periphery of the second reactor. Thus, the smooth flow of the flue gas between the flue gas discharge port of the second reactor and the flue gas discharge pipeline can be ensured.
In a further technical scheme, a demister is arranged between the flue gas discharge port of the second reactor and the second gas channel. Therefore, the water content of the discharged flue gas can be reduced, condensation in the water content emptying process is reduced, the heating requirement for the emptied flue gas is also reduced, and the water in the flue gas is favorably discharged in a gaseous state.
In a further technical scheme, a demister is arranged between the flue gas discharge port of the second reactor and the lower end of the flue gas discharge branch pipe. Defogging near the front end of the flue gas flow can reduce the adverse effect of moisture in the flue gas on rear-end equipment (such as a heat exchanger).
In an alternative technical scheme, the heat exchanger further comprises a third channel, and the third channel is isolated from the first gas channel and the second gas channel by heat exchange media. Thus, when the pure heat exchange between the high-temperature flue gas and the low-temperature flue gas cannot meet the flue gas purification requirement, the temperature of the flue gas can be adjusted through the third channel, and when the heat output of the high-temperature flue gas does not meet the low-temperature flue gas heating requirement, higher-temperature fluid (liquid or gas) can be input through the third channel, so that the heating requirement of the low-temperature flue gas is met; in the opposite case, a lower temperature fluid may be input through the third channel to meet the need for reducing high temperature flue gas.
Drawings
Fig. 1 is a schematic structural diagram of a flue gas purifying system according to an embodiment of the present invention.
FIG. 2 is a schematic view of the sectional structure A-A in FIG. 1.
Fig. 3 is a schematic diagram of a flue gas flow according to another embodiment of the present invention.
Detailed Description
In the prior art, the temperature of the flue gas to be purified discharged from the flue gas production equipment is higher, and a corresponding cooler is required to be arranged for cooling the flue gas to be purified before the flue gas to be purified (high-temperature flue gas) enters a flue gas purification system so as to avoid overhigh temperature in a reactor. Aiming at the defects existing in the background technology, one of the cores of the invention is that the heat energy in the high-temperature flue gas is transferred into the purified flue gas (low-temperature flue gas), thereby realizing the purpose of heating the low-temperature flue gas and simultaneously achieving the effect of reducing the high-temperature flue gas. The following describes embodiments of the flue gas cleaning system provided by the present invention, which may be used for desulfurizing or/and denitrating or removing other pollutants from flue gas.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a flue gas purifying system according to an embodiment of the present invention, and fig. 2 is a schematic sectional structural diagram of A-A in fig. 1. The flue gas purification system provided by the embodiment of the invention at least comprises two reactors, namely a first reactor 100 and a second reactor 200, wherein the first reactor 100 and the second reactor 200 are arranged in series, namely, a flue gas discharge port 102 of the first reactor 100 is communicated with a flue gas inlet 201 of the second reactor 200 through an intermediate flue 500, so that flue gas discharged from the first reactor 100 can enter the second reactor 200 to purify the flue gas at least twice.
In this embodiment, the inside of the first reactor 100 and the second reactor 200 may be provided with conical structures for cooperation of conical rings and cones according to known techniques. The flue gas inlet 101 of the first reactor 100 and the flue gas inlet 201 of the second reactor 200 are both located at the upper part, and the flue gas discharge port 102 of the first reactor 100 and the flue gas discharge port 202 of the second reactor 200 are both located at the lower part.
It will be appreciated by those skilled in the art that the first reactor 100 and the second reactor 200 may be used to purify the same contaminant, e.g., both for desulfurization, and may also be used to purify different contaminants, e.g., the first reactor 100 is primarily used to remove sulfur (e.g., SO 2 ) The second reactor 200 is mainly used for removing (small amount of SO in flue gas 2 ) Nitro-dust water vapor, etc. (e.g., NOx). Of course, according to actual needs, three or four reactors connected in series can be arranged, and different reactors have different or same main functions; of course, the specific structure and working mode of the reactor can be set according to actual needs.
In addition, the flue gas purification system provided by the embodiment of the invention further comprises a heat exchanger 300, wherein the heat exchanger 300 at least comprises a first gas channel and a second gas channel which are isolated by a heat exchange medium; the outlet of the first gas channel communicates with the flue gas inlet of the first reactor 100 and the flue gas discharge 202 of the second reactor 200 communicates with the inlet of the second gas channel.
By using the flue gas purification system, high-temperature flue gas (the temperature range is approximately 150-160 ℃) discharged by flue gas production equipment (a boiler, a metallurgical furnace or other equipment) can be communicated (directly connected or indirectly communicated) with the inlet of the first gas channel of the heat exchanger 300, so that the high-temperature flue gas firstly enters the first gas channel of the heat exchanger 300. Meanwhile, the low temperature flue gas (temperature range is approximately 50 degrees or so) discharged from the flue gas discharge port 202 of the second reactor 200 passes through the second gas passage of the heat exchanger 300. In this way, the heat exchanger 300 can exchange heat between the high-temperature flue gas and the low-temperature flue gas, so that the temperature of the high-temperature flue gas is reduced, and the temperature of the low-temperature flue gas is increased. The high-temperature flue gas temperature is reduced, the evaporation of water in the purification reaction process can be reduced, the water consumption is saved, the water content of the purified flue gas is reduced, the corrosion of the flue gas to equipment is reduced, and the defogging requirement before the flue gas emission is reduced.
Compared with the prior art that heating equipment is specially arranged to heat the purified low-temperature flue gas, the flue gas purification system does not need to be provided with equipment for heating the low-temperature flue gas separately; in addition, the high-temperature flue gas temperature can be reduced simultaneously, so that the high-temperature flue gas is not required to be cooled by additionally arranging a cooler, the structure of a flue gas purification system can be simplified, and the equipment investment, the operation cost and the energy consumption are reduced.
Referring to fig. 1 again, in this embodiment, the flue gas cleaning system further includes a flue gas exhaust pipe 400 located above the second reactor, the lower end of the flue gas exhaust pipe 400 is connected to the second reactor 200, the upper end extends upwards, and a flue gas exhaust cavity is formed inside.
The heat exchanger 300 may be formed in a flue gas duct, specifically including a heat exchange medium conduit located in the flue gas duct 400. The heat exchange medium pipe extends transversely in the smoke exhaust duct 400, and forms a first gas passage inside. A second gas channel is formed outside the heat exchange medium pipeline. Of course, in order to improve the heat exchange efficiency, the heat exchange medium pipeline can be arranged in a spiral, U-shaped or other shape. In order to guide the flow direction of the gas outside the heat exchange medium line, the heat exchange medium line may be provided with a predetermined shape to increase the flow path of the low temperature flue gas, increase the time of passing through the heat exchanger 300, and improve the heat exchange efficiency.
As shown in fig. 1 and 2, since the fume exhaust port 202 of the second reactor 200 is located at the lower portion, a plurality of fume exhaust branch pipes 600 are provided at the outer circumference of the second reactor 200 such that the lower ends of the fume exhaust branch pipes 600 communicate with the fume exhaust port 202 of the second reactor 200 and the upper ends communicate with the lower portion of the fume exhaust duct 400. In this way, the flue gas (low temperature flue gas) discharged from the lower portion of the second reactor 200 is introduced into the lower portion of the flue gas discharge pipe 400 through the flue gas discharge branch pipe 600, and then reaches the outside of the heat exchange medium pipe (second gas passage) of the heat exchanger 300 through the flue gas discharge pipe 400, thereby performing heat exchange with the high temperature flue gas of the first gas passage inside the heat exchange medium pipe.
Providing a plurality of the fume exhaust branch pipes 600 located outside the second reactor 200 can ensure smooth flow of the fume between the fume exhaust port of the second reactor 200 and the fume exhaust duct 400.
Since the flue gas inlet 201 of the second reactor 200 is located in the flue gas duct 400; in this embodiment, the flue gas duct 400 is provided with corresponding holes so that one end of the intermediate flue 500 extends into the flue gas duct 400 to meet the flue gas inlet 201 of the second reactor 200. This allows the flue gas duct 400 (stack) to be combined with the reactor, increasing the compactness of the flue gas cleaning system. Of course, the low-temperature flue gas entering the flue gas exhaust pipe 400 through the flue gas exhaust branch pipe 600 and the flue gas in the middle flue 500 can also perform heat exchange, so as to reduce the temperature of the flue gas entering the second reactor 200, raise the temperature of the flue gas entering the flue gas exhaust pipe 400, and be beneficial to improving the comprehensive effect of flue gas treatment of the flue gas purification system.
In this embodiment, the heat exchanger 300 is disposed in the smoke exhaust pipe 400, so that the structure of the smoke purification system can be further simplified, the heat in the high-temperature smoke can be more fully utilized, and the comprehensive effects of energy saving, purification efficiency and the like of the smoke purification system are improved. In addition, in this embodiment, the flue gas exhaust pipeline 400 and the second reactor 200 are installed together, so that the integration level of the flue gas purification system can be improved, and the occupation area of the flue gas purification system can be saved.
Of course, the upper end of the smoke exhaust pipe 400 may be communicated with the atmosphere to form a chimney; thus, a specially constructed chimney is omitted, and the manufacturing cost of the flue gas purification system is reduced. It will be appreciated that depending on the specific configuration of the second reactor 200, one skilled in the art may configure appropriate piping to direct the flow of flue gas to achieve the objectives of the present invention.
In order to reduce the water content of the exhaust flue gas (e.g. the exhaust flue gas), a demister may be provided between the flue gas discharge 202 of the second reactor 200 and the second gas channel. So as to reduce the possibility of condensation in the water emptying process and facilitate the discharge of the water in the flue gas in a gaseous state. In this embodiment, a demister 700 is provided between the flue gas discharge port 202 of the second reactor 200 and the lower end of the flue gas discharge branch 600. Thus, defogging is carried out at the front end close to the flow of the flue gas, and adverse effects of water in the flue gas on corrosion of rear-end equipment (such as a heat exchanger) and the like can be reduced.
It will be appreciated by those skilled in the art that depending on the reactor configuration, the arrangement of the reactor and heat exchanger 300 may be suitably arranged, as shown in FIG. 3, which illustrates a schematic diagram of the flue gas flow in accordance with another embodiment of the present invention. In this embodiment, the flue gas inlet of the first reactor 100 is located at the upper part and the flue gas discharge port is located at the lower part; the flue gas inlet of the second reactor 200 is located at the lower part and the flue gas discharge port is located at the upper part. In this flue gas purification system, the flue gas flow path is: first gas passage of heat exchanger 300→first reactor 100→second gas passage of heat exchanger 300. The high temperature flue gas and the low temperature flue gas are heat exchanged in the heat exchanger 300. Of course, in the actual construction of the flue gas purification system, a flue gas pipeline with proper length and effective section can be arranged according to the requirement to guide the flue gas to flow.
Considering that the high temperature flue gas input amount and the low temperature flue gas output amount are limited by the processing amount of the flue gas purification system, in order not to affect the processing capacity of the flue gas purification system, the heat exchanger 300 further comprises a third channel, wherein the third channel, the first gas channel and the second gas channel can be isolated by heat exchange media, and the third channel can be a liquid channel or a gas channel. Thus, when the pure heat exchange between the high-temperature flue gas and the low-temperature flue gas cannot meet the flue gas purification requirement, the temperature of the low-temperature flue gas or the high-temperature flue gas can be regulated through the third channel, and when the heat output of the high-temperature flue gas does not meet the low-temperature flue gas heating requirement, higher-temperature fluid (liquid or gas) can be input through the third channel, so that the heating requirement of the low-temperature flue gas is met; in the opposite case, a fluid with a lower temperature can be input through the third channel so as to meet the requirement of reducing the high-temperature flue gas; this may increase the flexibility of the flue gas cleaning system. The heat exchanger 300 may be configured as a gas-gas heat exchanger or a liquid-gas heat exchanger according to actual needs.
The foregoing description is only of the preferred embodiments of the invention, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the invention.
Claims (6)
1. A flue gas cleaning system comprising at least a first reactor (100) and a second reactor (200), characterized by further comprising a heat exchanger (300), the heat exchanger (300) comprising at least a first gas channel and a second gas channel separated by a heat exchange medium;
the outlet of the first gas channel is communicated with the flue gas inlet of the first reactor (100), the flue gas discharge port (102) of the first reactor (100) is communicated with the flue gas inlet (201) of the second reactor (200), and the flue gas discharge port (202) of the second reactor (200) is communicated with the inlet of the second gas channel;
also comprises a smoke exhaust pipe (400); the heat exchanger (300) comprises a heat exchange medium pipeline positioned in the smoke exhaust pipeline (400), wherein the first gas channel is formed in the heat exchange medium pipeline, and a second gas channel is formed outside the heat exchange medium pipeline; the fume exhaust port (202) of the second reactor (200) is communicated with the inlet of the second gas channel through the fume exhaust pipeline (400);
the smoke exhaust pipeline (400) is arranged at the upper part of the second reactor (200), and the smoke exhaust port (202) of the second reactor (200) is communicated with the lower part of the smoke exhaust pipeline (400);
-the flue gas inlet (201) of the second reactor (200) is located in the flue gas duct (400);
also comprises an intermediate flue (500); one end of the middle flue (500) is connected with the smoke discharge port (102) of the first reactor (100), and the other end of the middle flue extends into the smoke discharge pipeline (400) to be connected with the smoke inlet (201) of the second reactor (200);
the fume discharge port (202) of the second reactor (200) is positioned at the lower part; the device also comprises a smoke discharge branch pipe (600), wherein the lower end of the smoke discharge branch pipe (600) is communicated with the smoke discharge port (202) of the second reactor (200), and the upper end of the smoke discharge branch pipe is communicated with the lower part of the smoke discharge pipeline (400).
2. The flue gas cleaning system according to claim 1, wherein the upper end of the flue gas exhaust duct (400) is vented to atmosphere to form a stack.
3. The flue gas cleaning system according to claim 1, comprising a plurality of flue gas discharge branches (600) located outside the second reactor (200), a plurality of said flue gas discharge branches (600) being distributed at the periphery of said second reactor (200).
4. A flue gas cleaning system according to claim 1, characterized in that a mist eliminator (700) is arranged between the flue gas discharge (202) of the second reactor (200) and the second gas channel.
5. A flue gas cleaning system according to claim 4, wherein a mist eliminator (700) is arranged between the flue gas discharge opening (202) of the second reactor (200) and the lower end of the flue gas discharge branch pipe (600).
6. A flue gas cleaning system according to any one of claims 1-5, wherein the heat exchanger (300) further comprises a third channel, which is isolated from both the first gas channel and the second gas channel by a heat exchange medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710609175.6A CN107191956B (en) | 2017-07-25 | 2017-07-25 | Flue gas purifying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710609175.6A CN107191956B (en) | 2017-07-25 | 2017-07-25 | Flue gas purifying system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101701717A (en) * | 2009-09-17 | 2010-05-05 | 西安热工研究院有限公司 | Heating process of low-temperature flue gas with wetting flue gas desulphurization |
| CN103185346A (en) * | 2013-02-05 | 2013-07-03 | 锐能科技有限公司 | Combined purification system for waste incineration smoke and technology of combined purification system |
| CN207169372U (en) * | 2017-07-25 | 2018-04-03 | 史汉祥 | A kind of flue gas purification system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101701717A (en) * | 2009-09-17 | 2010-05-05 | 西安热工研究院有限公司 | Heating process of low-temperature flue gas with wetting flue gas desulphurization |
| CN103185346A (en) * | 2013-02-05 | 2013-07-03 | 锐能科技有限公司 | Combined purification system for waste incineration smoke and technology of combined purification system |
| CN207169372U (en) * | 2017-07-25 | 2018-04-03 | 史汉祥 | A kind of flue gas purification system |
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