CN215372390U - Exhaust-heat boiler flue gas system of recycling - Google Patents
Exhaust-heat boiler flue gas system of recycling Download PDFInfo
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- CN215372390U CN215372390U CN202121461392.3U CN202121461392U CN215372390U CN 215372390 U CN215372390 U CN 215372390U CN 202121461392 U CN202121461392 U CN 202121461392U CN 215372390 U CN215372390 U CN 215372390U
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model provides a waste heat boiler flue gas recycling system, which comprises a waste heat boiler, a purifying device and a heat exchange device, wherein the waste heat boiler is connected with the purifying device; the waste heat boiler is used for recovering high-temperature flue gas generated by the glass kiln; the interior of the waste heat boiler is divided into a first heat recovery section and a second heat recovery section which are not communicated with each other; the smoke inlet of the purification device is communicated with the smoke outlet of the first heat recovery section, and the smoke outlet of the purification device is communicated with the smoke inlet of the second heat recovery section; the smoke outlet of the purification device is also communicated with a smoke pipe network; the heat exchange device is connected in parallel with the smoke inlet of the waste heat boiler and the smoke outlet of the waste heat boiler; when the waste heat boiler is shut down, high-temperature flue gas enters the purification device through the heat exchange device, is introduced into the flue gas pipe network after being purified, and the heat exchange device is used for recovering heat of the high-temperature flue gas and generating steam. The waste heat boiler flue gas recycling system provided by the utility model can recycle heat in high-temperature flue gas when the waste heat boiler is shut down, and saves energy.
Description
Technical Field
The utility model belongs to the technical field of waste heat boiler heat recovery, and particularly relates to a waste heat boiler flue gas recycling system.
Background
In a glass production line, high-temperature flue gas generated by a glass kiln carries a large amount of heat, and the high-temperature flue gas is directly discharged into the atmosphere to cause serious resource waste, so that the high-temperature flue gas is generally recycled by using a waste heat boiler; the heat carried by the high-temperature flue gas enables the waste heat boiler to generate steam, and the steam is finally merged into a steam pipe network for generating power and supplying steam for other sections.
However, high-temperature flue gas generated by the glass kiln contains a large amount of solid dust and gas pollutants, and the dust can be attached to a heat exchange tube bundle in a boiler, so that the efficiency of the boiler is reduced, and the waste heat boiler is also corroded, so that the waste heat boiler is inevitable when being stopped; high temperature flue gas after stopping the stove directly lets in dust removal denitration process because the temperature is higher, can cause dust collecting equipment high temperature to warp and can not operate, the catalyst overtemperature is rotten and is lost the activity, shortens catalyst life and denitration efficiency, the problem that the emission that finally leads to is not up to standard.
In order to avoid the problem that the emission is not up to standard, in the prior art, the high-temperature flue gas is cooled by an air cooling or water cooling desuperheater firstly, and then the dedusting and denitration process is carried out, but the high-temperature flue gas is cooled to cause a large amount of heat energy waste.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a waste heat boiler flue gas recycling system, and aims to solve the problem of energy waste caused by the existing high-temperature flue gas treatment means when a waste heat boiler is shut down.
In order to achieve the purpose, the utility model adopts the technical scheme that: the waste heat boiler flue gas recycling system comprises a waste heat boiler, a purifying device and a heat exchange device; the waste heat boiler is used for recovering high-temperature flue gas generated by the glass kiln; the interior of the waste heat boiler is divided into a first heat recovery section and a second heat recovery section which are not communicated with each other; the first heat recovery section and the second heat recovery section are respectively provided with a smoke inlet and a smoke outlet;
the smoke inlet of the purification device is communicated with the smoke outlet of the first heat recovery section, and the smoke outlet of the purification device is communicated with the smoke inlet of the second heat recovery section; the smoke outlet of the purification device is also communicated with a smoke pipe network;
the heat exchange device is connected in parallel with the smoke inlet of the waste heat boiler and the smoke outlet of the waste heat boiler;
wherein, the smoke inlet and the smoke outlet of the waste heat boiler, the smoke inlet and the smoke outlet of the heat exchange device and the smoke inlet and the smoke outlet of the purification device are connected with smoke valves;
when the waste heat boiler operates, high-temperature flue gas enters the purification device through the first heat recovery section, and then enters the second heat recovery section to recover heat after being purified;
when the waste heat boiler is shut down, high-temperature flue gas enters the purification device through the heat exchange device, and is introduced into the flue gas pipe network after being purified.
In a possible implementation manner, the heat exchange device is a saturated steam boiler, a steam outlet of the saturated steam boiler is communicated with the industrial steam pipe network, a steam outlet of the second heat recovery section is communicated with a steam outlet of the first heat recovery section, and a steam outlet of the first heat recovery section is communicated with the power generation steam pipe network.
In some embodiments, a saturated steam boiler comprises a third heat recovery section and a low pressure drum; wherein the third heat recovery section has a first water inlet and a first steam outlet;
the low-pressure boiler barrel is provided with a main water inlet communicated with the water outlet of the desalting pump, a second water outlet communicated with the first water inlet, a second steam inlet communicated with the first steam outlet and a second steam outlet communicated with the industrial steam pipe network.
In some embodiments, the waste heat boiler is also in communication with the water outlet of the desalination pump.
In one possible implementation manner, the purification device comprises an electric dust removal mechanism and a denitration mechanism; the smoke inlet of the electric dust removing mechanism is respectively communicated with the smoke outlet of the first heat recovery section and the smoke outlet of the heat exchange device, and the electric dust removing mechanism is used for removing dust in smoke discharged by the first heat recovery section or the heat exchange device;
the smoke inlet of the denitration mechanism is communicated with the smoke outlet of the electric dust removal mechanism, the smoke outlet of the denitration mechanism is respectively communicated with the smoke inlet of the second heat recovery section and the smoke pipe network, and the denitration mechanism is used for carrying out denitration treatment on smoke processed by the electric dust removal mechanism.
In some embodiments, the purification apparatus is provided with a backup denitration mechanism, and the smoke inlet and the smoke outlet of the backup denitration mechanism are connected in parallel with the smoke inlet and the smoke outlet of the denitration mechanism.
In a possible implementation mode, a second-stage cooler is arranged on a pipeline connected with a smoke outlet and a smoke pipe network of the purifying device, the second-stage cooler is used for carrying out secondary cooling on smoke processed by the purifying device, and a smoke inlet and a smoke outlet of the second-stage cooler are both provided with smoke valves.
In a possible implementation manner, the bottoms of the first heat recovery section and the second heat recovery section are both provided with slag outlets.
In one possible implementation manner, a plurality of evaporator units and a plurality of superheater units are arranged in the first heat recovery section, and a plurality of evaporator units and a plurality of economizer units are arranged in the second heat recovery section.
Compared with the prior art, according to the scheme shown in the embodiment of the application, the heat exchange device is connected with the first heat recovery section of the waste heat boiler in parallel, when the waste heat boiler normally works, the first heat recovery section recovers high-temperature flue gas and generates steam by using heat in the flue gas, the flue gas enters the purification device for dedusting and denitration after being cooled, the purified flue gas enters the second heat recovery section again, and heat recovery is continuously performed for generating steam; when exhaust-heat boiler blowing out, then retrieve the high temperature flue gas and utilize the heat generation steam in the flue gas through heat transfer device, flue gas behind heat transfer device recovery heat satisfies the operating temperature of dust removal denitration, guarantees purifier and can normal operating, makes the flue gas accord with emission standard, and heat transfer device can retrieve the heat and produce steam when cooling for high temperature flue gas, supplies the production life to use, saves a large amount of resources.
Drawings
FIG. 1 is a schematic structural diagram of flue gas circulation of a flue gas recycling system of a waste heat boiler provided by an embodiment of the utility model;
FIG. 2 is a schematic structural diagram of steam-water circulation of a saturated steam boiler according to an embodiment of the present invention;
description of reference numerals:
1. a waste heat boiler; 11. a first heat recovery section; 12. a second heat recovery section; 13. a slag discharge port; 2. a heat exchange device; 21. a third heat recovery section; 211. a first water inlet; 212. a first steam outlet; 22. a low pressure drum; 221. a main water inlet; 222. a second water outlet; 223. a second steam inlet; 224. a second steam outlet; 23. a desalting pump; 3. a purification device; 31. an electric dust removing mechanism; 32. a denitration mechanism; 321. a standby denitration mechanism; 4. a flue gas valve; 5. a secondary cooler; 6. a flue gas pipe network; 7. an industrial steam pipe network; 81. an evaporator unit; 82. a superheater unit; 83. an economizer unit.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Referring to fig. 1 and fig. 2 together, a flue gas recycling system of a waste heat boiler according to the present invention will now be described. The waste heat boiler flue gas recycling system comprises a waste heat boiler 1, a purifying device 3 and a heat exchange device 2; wherein the waste heat boiler 1 is used for recovering high-temperature flue gas generated by the glass kiln; the interior of the waste heat boiler 1 is divided into a first heat recovery section 11 and a second heat recovery section 12 which are not communicated with each other; the first heat recovery section 11 and the second heat recovery section 12 have a smoke inlet and a smoke outlet, respectively;
the smoke inlet of the purifying device 3 is communicated with the smoke outlet of the first heat recovery section 11, and the smoke outlet of the purifying device 3 is communicated with the smoke inlet of the second heat recovery section 12; the smoke outlet of the purification device 3 is also communicated with a smoke pipe network 6;
the heat exchange device 2 is connected in parallel with the smoke inlet of the waste heat boiler 1 and the smoke outlet of the waste heat boiler 1;
wherein, the smoke inlet and the smoke outlet of the waste heat boiler 1, the smoke inlet and the smoke outlet of the heat exchange device 2 and the smoke inlet and the smoke outlet of the purifying device 3 are connected with smoke valves 4;
when the waste heat boiler 1 is in operation, high-temperature flue gas enters the purification device 3 through the first heat recovery section 11, and then enters the second heat recovery section 12 to recover heat after being purified;
when the waste heat boiler 1 is shut down, high-temperature flue gas enters the purifying device 3 through the heat exchange device 2, and is introduced into the flue gas pipe network 6 after being purified.
When exhaust-heat boiler 1 normally works, flue gas valve 4 of heat transfer device 2's inlet flue and outlet flue department all is in the closed condition, and heat transfer device 2 is out of work, directly lets in from glass kiln exhaust high temperature flue gas and is used for generating steam in exhaust-heat boiler 1's the first heat recovery section 11, after the heat is tentatively retrieved in first heat recovery section 11, the temperature of flue gas reduces, satisfies the temperature requirement of dust removal denitration, and the flue gas gets into and carries out dust removal denitration process in the purifier 3. The purified flue gas is introduced into the second heat recovery section 12 of the waste heat boiler 1, the second heat recovery section 12 further absorbs heat in the flue gas and generates steam, and the flue gas enters the flue gas pipe network 6 through a flue gas outlet of the second heat recovery section 12 for subsequent treatment.
When the waste heat boiler 1 is ready to be shut down, the opening degree of a flue gas valve 4 at a flue gas inlet and a flue gas outlet of the heat exchange device 2 is controlled, so that a small amount of high-temperature flue gas enters the heat exchange device 2, and the heat exchange device 2 absorbs heat in the high-temperature flue gas and generates steam; when the working state of the heat exchange device 2 is stable, the flue gas valves 4 at the flue gas inlet and the flue gas outlet of the heat exchange device 2 are completely opened, the waste heat boiler 1 is completely shut down, and the flue gas valves 4 at the flue gas inlet and the flue gas outlet of the first heat recovery section 11 and the second heat recovery section 12 are closed; the temperature of the flue gas after heat recovery by the heat exchange device 2 is reduced to meet the requirements of dust removal and denitration, and the flue gas is introduced into the purification device 3 to perform a dust removal and denitration process; the purified flue gas is introduced into a flue gas pipe network 6 for subsequent treatment; the steam generated by the heat exchange device 2 is used for other work sections or practical life.
Compared with the prior art, the exhaust-heat boiler flue gas recycling system provided by the embodiment has the advantages that the heat exchange device 2 is connected in parallel with the first heat recovery section 11 of the exhaust-heat boiler 1, when the exhaust-heat boiler 1 normally works, the first heat recovery section 11 recovers high-temperature flue gas and generates steam by using heat in the flue gas, the flue gas enters the purification device 3 for dedusting and denitration after being cooled, the purified flue gas enters the second heat recovery section 12 again, and heat recovery is continuously performed for generating steam; when exhaust-heat boiler 1 blowing out, then retrieve the high temperature flue gas and utilize the heat generation steam in the flue gas through heat transfer device 2, flue gas behind the heat is retrieved to heat transfer device 2, satisfies the operating temperature of dust removal denitration, guarantees that purifier 3 can normal operating, makes the flue gas accord with emission standard, and heat transfer device 2 can retrieve the heat and produce steam when cooling for the high temperature flue gas, supplies the production life to use, saves a large amount of resources.
In a possible implementation manner, the heat exchange device 2 is a saturated steam boiler, a steam outlet of the saturated steam boiler is communicated with an industrial steam pipe network, a steam outlet of the second heat recovery section 12 is communicated with a steam outlet of the first heat recovery section 11, and a steam outlet of the first heat recovery section is communicated with a power generation steam pipe network.
When the waste heat boiler 1 can work normally, saturated steam generated by the second heat recovery section 12 is introduced into the first heat recovery section 11, the saturated steam is continuously heated by using high-temperature flue gas in the first heat recovery section 11 to be changed into dry steam, and the generated dry steam is introduced into a power generation steam pipe network and used for driving a steam turbine to generate power; when the waste heat boiler 1 is shut down, high-temperature flue gas is introduced into a saturated steam boiler, the saturated steam boiler recovers heat in the high-temperature flue gas and generates saturated steam, and the saturated steam at the position is introduced into an industrial steam pipe network for other sections or life use. The saturated steam boiler can recover heat in high-temperature flue gas generated by the glass kiln when the waste heat boiler 1 is shut down, and generate saturated steam for other sections or life, so that energy consumption is greatly reduced.
In some embodiments, as shown in fig. 2, the saturated steam boiler comprises a third heat recovery section 21 and a low pressure drum 22; wherein the third heat recovery section 21 has a first water inlet 211 and a first steam outlet 212; the low pressure drum 22 has a main water inlet 221 communicating with the water outlet of the desalination pump 23, a second water outlet 222 communicating with the first water inlet 211, a second steam inlet 223 communicating with the first steam outlet 212, and a second steam outlet 224 communicating with the industrial steam pipe network 7.
The low-pressure boiler barrel 22 is a steam-water mixture, water in the steam-water mixture enters the evaporator unit 81 of the third heat recovery section 21 through the second water outlet 222 and the first water inlet 211 of the third heat recovery section 21, the high-temperature flue gas heats the water in the third heat recovery section 21, generated steam (the steam contains more moisture) enters the low-pressure boiler barrel 22 through the first steam outlet 212 and the second steam inlet 223 of the low-pressure boiler barrel 22 for steam-water separation, and the steam (the steam contains less moisture) after the steam-water separation enters the industrial steam pipe network 7 through the second steam outlet 224 of the low-pressure boiler barrel 22; when the waste heat boiler 1 is shut down, the third heat recovery section 21 and the low-pressure boiler barrel 22 of the saturated steam boiler can supply steam to the industrial steam pipe network 7, so that the requirements of other sections or domestic gas are met. Wherein, the desalination pump 23 supplies water into the low-pressure drum 22 through the main water inlet 221 of the low-pressure drum 22, and supplements the water lost by the low-pressure drum 22 due to continuous steam transmission into the industrial steam pipe network 7.
Specifically, the exhaust-heat boiler 1 is also communicated with the water outlet of the desalination pump 23. When the waste heat boiler 1 works normally, a large amount of water is needed to be consumed to generate steam, the waste heat boiler 1 and the saturated steam boiler share a water supply system of the desalination pump 23, pipelines can be simplified, and the reconstruction cost is reduced.
In one possible implementation, as shown in fig. 1, the purification apparatus 3 includes an electric dust removal mechanism 31 and a denitration mechanism 32; wherein, the smoke inlet of the electric dust removing mechanism 31 is respectively communicated with the smoke outlet of the first heat recovery section 11 and the smoke outlet of the heat exchanging device 2, and the electric dust removing mechanism 31 is used for removing dust in the smoke discharged by the first heat recovery section 11 or the heat exchanging device 2;
the smoke inlet of the denitration mechanism 32 is communicated with the smoke outlet of the electric dust removal mechanism 31, the smoke outlet of the denitration mechanism 32 is respectively communicated with the smoke inlet of the second heat recovery section 12 and the smoke pipe network 6, and the denitration mechanism 32 is used for carrying out denitration treatment on smoke processed by the electric dust removal mechanism 31.
The temperature of the high-temperature flue gas discharged from the glass kiln is about 550 ℃, the suitable temperature of the denitration process is about 370 ℃, the first heat recovery section 11 and the heat exchange device 2 which are communicated with the flue gas inlet of the purification device 3 can recover the heat in the high-temperature flue gas and cool the flue gas to about 370 ℃, and the temperature requirement of the denitration process is met. Set up electric precipitation mechanism 31 before denitration mechanism 32, can make electric precipitation mechanism 31 absorb the dust in the flue gas in advance, avoid the catalyst or other parts in dust jam denitration mechanism 32, prolong purifier 3 sweep and maintain the frequency.
When the waste heat boiler 1 normally works, the flue gas discharged by the denitration mechanism 32 is introduced into the second heat recovery section 12 to be continuously used for producing steam, and when the waste heat boiler 1 is shut down, the flue gas discharged by the denitration mechanism 32 is merged into the flue gas pipe network 6.
In some embodiments, as shown in fig. 1, the purification apparatus 3 is provided with a backup denitration mechanism 321, and the smoke inlet and the smoke outlet of the backup denitration mechanism 321 are connected in parallel with the smoke inlet and the smoke outlet of the denitration mechanism 32.
The smoke valves 4 are arranged at the smoke inlet and the smoke outlet of the standby denitration mechanism 321, when the denitration mechanism 32 works normally, the smoke valves 4 at the smoke inlet and the smoke outlet of the standby denitration mechanism 321 are in a closed state, and the standby denitration mechanism 321 does not work; when the denitration mechanism 32 cannot work normally or the content of oxynitride in the flue gas is high, the flue gas valves 4 at the flue gas inlet and the flue gas outlet of the standby denitration mechanism 321 are opened, and the standby denitration mechanism 321 starts to work. The provision of the standby denitration mechanism 321 can ensure that the denitration process of the purification apparatus 3 can be stably operated or the denitration efficiency can be enhanced.
In a possible implementation manner, as shown in fig. 1, a second-stage cooler 5 is arranged in a pipeline connecting a smoke outlet of the purification device 3 and the smoke pipe network 6, the second-stage cooler 5 is used for carrying out secondary cooling on smoke processed by the purification device 3, and a smoke inlet and a smoke outlet of the second-stage cooler 5 are both provided with smoke valves 4.
When the waste heat boiler 1 works normally, the smoke valves 4 at the smoke inlet and the smoke outlet of the secondary cooler 5 are in a closed state, and the smoke discharged by the purifying device 3 is introduced into the second heat recovery section 12; when the exhaust-heat boiler 1 is shut down, the flue gas valve 4 at the smoke inlet and the smoke outlet of the second-stage cooler 5 is in an open state, the flue gas valve 4 at the smoke inlet of the second heat recovery section 12 is in a closed state, the flue gas discharged from the purifying device 3 is cooled by the second-stage cooler 5, and the cooled flue gas is discharged into the flue gas pipe network 6, so that the flue gas is treated or discharged in the later stage. The secondary cooler 5 is arranged to ensure that the flue gas discharged by the purifying device 3 can be cooled still in the state that the waste heat boiler 1 is shut down, and the subsequent temperature requirement for treating or discharging the flue gas is met.
In one possible implementation, as shown in fig. 1, the bottoms of the first heat recovery section 11 and the second heat recovery section 12 are provided with slag outlets 13. Have multiple pollutants such as dust, oxynitrides and sulfur oxides in letting in the high temperature flue gas in first heat recovery section 11, though the flue gas that lets in second heat recovery section 12 passes through purifier 3's processing, still can have pollutants such as sulfur oxides, sets up row cinder notch 13 in the bottom of first heat recovery section 11 and second heat recovery section 12, can discharge the solid pollutant granule in exhaust-heat boiler 1, extension exhaust-heat boiler 1's operation cycle.
In one possible implementation, as shown in fig. 1, a plurality of evaporator units 81 and a plurality of superheater units 82 are provided in the first heat recovery section 11, and a plurality of evaporator units 81 and a plurality of economizer units 83 are provided in the second heat recovery section 12. The evaporator unit 81 of the first heat recovery section 11 can convert water into steam, and the superheater unit 82 can heat the steam into supersaturated steam by using the heat of the flue gas, so that the water content in the steam is reduced, the thermal efficiency of the steam at other sections is improved, and the corrosion effect of the moisture of the steam on a pipeline is reduced. The evaporator unit 81 in the second heat recovery section 12 can further absorb the heat in the flue gas treated by the purification device 3 and generate steam for other working sections or life and practicality, and the economizer unit 83 is arranged at the tail end of the second heat recovery section 12, so that the heat in the flue gas can be absorbed to the maximum extent, and the resource waste is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The utility model provides a waste heat boiler flue gas system of recycling which characterized in that includes:
the waste heat boiler is used for recovering high-temperature flue gas generated by the glass kiln; the interior of the waste heat boiler is divided into a first heat recovery section and a second heat recovery section which are not communicated with each other; the first heat recovery section and the second heat recovery section are respectively provided with a smoke inlet and a smoke outlet;
the smoke inlet of the purification device is communicated with the smoke outlet of the first heat recovery section, and the smoke outlet of the purification device is communicated with the smoke inlet of the second heat recovery section; the smoke outlet of the purification device is also communicated with a smoke pipe network; and
the heat exchange device is connected in parallel with the smoke inlet of the waste heat boiler and the smoke outlet of the waste heat boiler;
wherein, the smoke inlet and the smoke outlet of the waste heat boiler, the smoke inlet and the smoke outlet of the heat exchange device and the smoke inlet and the smoke outlet of the purification device are connected with smoke valves;
when the waste heat boiler operates, the high-temperature flue gas enters the purification device through the first heat recovery section, and then enters the second heat recovery section to recover heat after being purified; when the waste heat boiler is shut down, the high-temperature flue gas enters the purification device through the heat exchange device, and is introduced into the flue gas pipe network after being purified.
2. The exhaust-heat boiler flue gas recycling system of claim 1, wherein the heat exchange device is a saturated steam boiler, a steam outlet of the saturated steam boiler is communicated with an industrial steam pipe network, a steam outlet of the second heat recovery section is communicated with the first heat recovery section, and a steam outlet of the first heat recovery section is communicated with a power generation steam pipe network.
3. The exhaust heat boiler flue gas recycling system of claim 2, wherein the saturated steam boiler comprises:
a third heat recovery section having a first water inlet and a first steam outlet;
the low-pressure boiler barrel is provided with a main water inlet communicated with a water outlet of the desalting pump, a second water outlet communicated with the first water inlet, a second steam inlet communicated with the first steam outlet and a second steam outlet communicated with the industrial steam pipe network.
4. The exhaust-heat boiler flue gas recycling system of claim 3, wherein the exhaust-heat boiler is also in communication with the water outlet of the desalination pump.
5. The exhaust-heat boiler flue gas recycling system of claim 1, characterized in that the cleaning device comprises:
the smoke inlet of the electric dust removal device is respectively communicated with the smoke outlet of the first heat recovery section and the smoke outlet of the heat exchange device, and the electric dust removal mechanism is used for removing dust in the smoke discharged by the first heat recovery section or the heat exchange device;
the smoke inlet of the denitration mechanism is communicated with the smoke outlet of the electric dust removal mechanism, the smoke outlet of the denitration mechanism is communicated with the smoke inlet of the second heat recovery section and the smoke pipe network respectively, and the denitration mechanism is used for carrying out denitration treatment on smoke processed by the electric dust removal mechanism.
6. The exhaust-heat boiler flue gas recycling system of claim 5, wherein the purification device is provided with a standby denitration mechanism, and a flue gas inlet and a flue gas outlet of the standby denitration mechanism are connected in parallel with a flue gas inlet and a flue gas outlet of the denitration mechanism.
7. The exhaust-heat boiler flue gas recycling system of claim 1, wherein a second-stage cooler is arranged on a pipeline connecting the flue gas outlet of the purification device and the flue gas pipe network, the second-stage cooler is used for carrying out secondary cooling on the flue gas treated by the purification device, and the flue gas valve is arranged on each of the flue gas inlet and the flue gas outlet of the second-stage cooler.
8. The exhaust-heat boiler flue gas recycling system of claim 1, wherein the bottoms of the first heat recovery section and the second heat recovery section are provided with slag outlets.
9. The exhaust-heat boiler flue gas recycling system of claim 1, wherein a plurality of evaporator units and a plurality of superheater units are provided in the first heat recovery section, and a plurality of evaporator units and a plurality of economizer units are provided in the second heat recovery section.
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| CN202121461392.3U CN215372390U (en) | 2021-06-29 | 2021-06-29 | Exhaust-heat boiler flue gas system of recycling |
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| CN202121461392.3U CN215372390U (en) | 2021-06-29 | 2021-06-29 | Exhaust-heat boiler flue gas system of recycling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116336823A (en) * | 2023-04-26 | 2023-06-27 | 深圳凯盛科技工程有限公司 | Flue gas treatment system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116336823A (en) * | 2023-04-26 | 2023-06-27 | 深圳凯盛科技工程有限公司 | Flue gas treatment system and method |
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