CN210267304U - Boiler flue gas denitration device - Google Patents
Boiler flue gas denitration device Download PDFInfo
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- CN210267304U CN210267304U CN201921081917.3U CN201921081917U CN210267304U CN 210267304 U CN210267304 U CN 210267304U CN 201921081917 U CN201921081917 U CN 201921081917U CN 210267304 U CN210267304 U CN 210267304U
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- flue gas
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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
- 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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a boiler flue gas denitrification facility, the device includes boiler body, flue gas mixing arrangement, SCR reactor device, gas heater, fan, air heater and connects the flue gas pipeline and the wind channel of each equipment. By the device, when the temperature of the flue gas entering the SCR reactor device is lower than a designed temperature range, the high-temperature flue gas led out from the outlet of the boiler hearth and the low-temperature flue gas at the outlet of the boiler are mixed in the flue gas heat exchanger, and the mixed flue gas reaches the designed temperature range, so that the denitration reaction effect and the denitration efficiency are ensured; and (4) recovering heat of the denitrated flue gas through a flue gas heat exchanger.
Description
Technical Field
The utility model relates to a boiler pollutant prevention and cure field specifically is a boiler flue gas denitrification facility.
Background
The boiler is a boiler to be transportedThe energy conversion equipment for converting chemical energy of fuel into heat energy is characterized by that the fuel and air fed into the boiler are combusted in the furnace cavity to produce high-temp. flue gas containing several pollutants, and in order to reduce or eliminate the damage of these pollutants to environment and human body, a series of pollutant-removing techniques and equipments are required. Wherein, the harmful substance Nitrogen Oxide (NO) in the smokeX) The method is an important reason for forming chemical smog and acid rain, and can also affect the health of human beings, so the nitric oxide in the flue gas needs to be removed before the flue gas of the boiler is discharged into the atmosphere, and the nitric oxide removing device is a flue gas denitration device.
In recent years, the national requirements for the emission of NOx in boiler flue gas are more and more strict, and in many areas, boilers are required to realize ultra-low emission, so that the boilers are required to be provided with equipment with higher removal efficiency, and the Selective Catalytic Reduction (SCR) method is widely applied due to the characteristics of high removal efficiency, small secondary pollution, mature technology and the like.
The principle of the SCR method is as follows: in the SCR denitration process, NOx can be converted into nitrogen (N) naturally contained in air by adding ammonia2) And water (H)2O), the main chemical reaction of which is as follows:
4NO + 4NH3+ O2→ 4N2+ 6H2O (1)
6NO + 4NH3→ 5N2+ 6H2O (2)
6NO2+ 8NH3→ 7N2+ 12H2O (3)
2NO2+ 4NH3+ O2→ 3N2+ 6H2O (4)
in the absence of the catalyst, the chemical reaction is only carried out in a narrow temperature range (850-. And selectivity means NH under the action of a catalyst and in the presence of oxygen3Preferentially react with NOx in a reduction mode, but do not react with oxygen in the flue gas in an oxidation mode.
At present, the SCR system at home and abroad mostly adopts high-temperature catalysts, and the reaction temperature is 320-420 ℃. The factor that influences the denitrification facility efficiency is the temperature of flue gas, when denitration reactor entry flue gas temperature is less than a certain temperature, can lead to catalyst activity to reduce, if spout into excessive ammonia for control nitrogen oxide, then the ammonia concentration in the afterbody flue will rise, and the increase is escaped to ammonia, and sulfur trioxide concentration risees simultaneously. The ammonia gas and the sulfur trioxide generate ammonium bisulfate at the smoke temperature of 200-300 ℃, the ammonium bisulfate is a viscous substance and can be bonded on the denitration catalyst and the air preheater, dust is adsorbed, the denitration catalyst and the air preheater are blocked, the pressure difference between the denitration reactor and the air preheater is slowly increased, and therefore the output of the induced draft fan is reduced, and the output of a unit is influenced.
When the boiler is operated at a low load, the temperature of the flue gas entering the denitration reactor may be lower than a designed value range, and therefore measures need to be taken to ensure that the temperature of the flue gas entering the denitration reactor meets requirements so as to ensure the denitration reaction effect and the denitration efficiency.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a satisfy denitrification facility flue gas inlet temperature requirement, and simple structure, operation safe and reliable's boiler flue gas denitrification facility.
In order to realize the purpose, the utility model discloses a technical scheme is:
a boiler flue gas denitration device, it includes: the system comprises a boiler body, an SCR reactor device, and a flue gas pipeline and an air duct which are connected with each device;
the boiler flue gas denitration device also comprises a flue gas mixing device in front of the SCR reactor device and a flue gas heat exchanger behind the SCR reactor device;
the boiler body comprises a hearth, a boiler horizontal flue and a boiler vertical flue;
the flue gas pipeline comprises a hearth outlet smoke exhaust pipeline, a boiler outlet smoke exhaust pipeline, a flue gas mixing device outlet smoke exhaust pipeline and an SCR reactor outlet smoke exhaust pipeline; the furnace outlet smoke exhaust pipeline is a pipeline extending from a horizontal flue of the boiler to the outer side of the boiler, and the other side of the furnace outlet smoke exhaust pipeline is connected to the smoke mixing device; the boiler outlet smoke exhaust pipeline extends from the outlet of the vertical flue of the boiler to a pipeline outside the boiler, and the other side of the boiler outlet smoke exhaust pipeline is connected to the smoke mixing device; the outlet smoke discharge pipeline of the smoke mixing device is connected with the smoke mixing device and the SCR reactor device; the other end of the smoke exhaust pipeline at the outlet of the SCR reactor is connected with the smoke heat exchanger;
the lower stream of the flue gas heat exchanger is also connected with an air preheater, a front smoke exhaust pipeline is arranged between the flue gas heat exchanger and the air preheater, and the air preheater is sequentially connected with a dust remover, a desulfurization device and a chimney through a rear smoke exhaust pipeline; the air duct connects the fan, the air preheater and the burner.
Furthermore, a regulating valve is arranged on the smoke exhaust pipeline at the outlet of the hearth.
Furthermore, a temperature measuring device is arranged on the smoke exhaust pipeline at the outlet of the boiler.
Furthermore, the flue gas mixing device is provided with a bypass flue, the bypass flue is connected with the boiler outlet smoke exhaust pipeline and the flue gas mixing device outlet smoke exhaust pipeline, and the bypass flue is provided with a regulating valve.
Furthermore, a temperature measuring device is arranged on the smoke exhaust pipeline at the outlet of the smoke mixing device.
Furthermore, a plurality of catalyst layers are arranged in the SCR reactor device; the catalyst of the catalyst layer is vertically arranged; to prevent the accumulation of particles, the SCR reactor device is equipped with soot blowers on each level.
Furthermore, the flue gas heat exchanger is provided with a bypass flue, the bypass flue is connected with the front smoke exhaust pipeline and the rear smoke exhaust pipeline, and the bypass flue is provided with a regulating valve.
Further, the flue gas heat exchanger can be used as a boiler economizer and can also be used for heating flue gas at the outlet of a boiler.
The utility model has the advantages that: when the temperature of the flue gas entering the SCR reactor device is lower than a set value, mixing the high-temperature flue gas led out from the outlet of the boiler hearth with the low-temperature flue gas at the outlet of the boiler in a flue gas heat exchanger, wherein the mixed flue gas meets the temperature requirement, so that the denitration reaction effect and the denitration efficiency are ensured; and (4) recovering heat of the denitrated flue gas through a flue gas heat exchanger.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of a boiler flue gas denitration device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of heat exchange of an embodiment of the flue gas heat exchanger of the present invention;
FIG. 3 is a schematic diagram of another embodiment of the flue gas heat exchanger of the present invention;
wherein: 1. the boiler comprises a boiler body, 2, a flue gas mixing device, 3, an SCR reactor device, 4, a flue gas heat exchanger, 5, a fan, 6, an air channel, 7, a flue gas pipeline, 8, an air preheater, 11, a hearth, 12, a boiler horizontal flue, 13, a boiler vertical flue, 14, a burner, 21, a regulating valve, 22, a regulating valve, 23, a temperature measuring device, 24, a temperature measuring device, 71, a hearth outlet smoke exhaust pipeline, 72, a boiler outlet smoke exhaust pipeline, 73, a flue gas mixing device outlet smoke exhaust pipeline, 74, an SCR reactor outlet smoke exhaust pipeline, 75, a front smoke exhaust pipeline, 76, a rear smoke exhaust pipeline, 77, a bypass flue and 78.
Detailed Description
In order to deepen the understanding of the present invention, the present invention will be further explained with reference to the drawings and the embodiments, which are only used to explain the present invention and are not intended to limit the protection scope of the present invention.
Fig. 1 is the utility model provides a pair of boiler flue gas denitrification facility's schematic structure, as shown in fig. 1, a boiler flue gas denitrification facility, include: the system comprises a boiler body 1, a flue gas mixing device 2, an SCR reactor device 3, a flue gas heat exchanger 4, a fan 5, an air preheater 8, and a flue gas pipeline 7 and an air duct 6 which are connected with each device.
Wherein, the boiler body 1 comprises a hearth 11, a boiler horizontal flue 12, a boiler vertical flue 13 and a burner 14. Pulverized coal and air are sent into a hearth 11 to be combusted in a rotating mode through a combustor, high-temperature flue gas after combustion carries out radiation heat exchange with a water-cooled wall in the hearth 11, then carries out convection heat exchange with heating surfaces arranged in a horizontal flue 12 and a boiler vertical flue 13, and low-temperature flue gas after heat exchange is discharged from a boiler outlet.
Wherein, the flue gas pipeline 7 comprises a hearth outlet smoke exhaust pipeline 71, a boiler outlet smoke exhaust pipeline 72, a flue gas mixing device outlet smoke exhaust pipeline 73, an SCR reactor outlet smoke exhaust pipeline 74, a front smoke exhaust pipeline 75, a rear smoke exhaust pipeline 76, a bypass flue 77 and a bypass flue 78.
In this embodiment, as shown in fig. 1, the furnace outlet smoke exhaust duct 71 is a duct extending from the horizontal flue 12 of the boiler to the outside of the boiler, the other side of the furnace outlet smoke exhaust duct is connected to the flue gas mixing device 2, and the furnace outlet smoke exhaust duct 71 is provided with the regulating valve 21; the boiler outlet smoke exhaust pipeline 72 is a pipeline extending from the outlet of the boiler vertical flue 13 to the outer side of the boiler, and the other side of the boiler outlet smoke exhaust pipeline is connected to the smoke mixing device 2; the temperature measuring device 23 is arranged on the smoke exhaust pipeline 73 at the outlet of the smoke mixing device; the flue gas mixing device 2 is provided with a bypass flue 77 which is connected with a boiler outlet smoke exhaust pipeline 72 and a flue gas mixing device outlet smoke exhaust pipeline 73, and the bypass flue 77 is provided with a regulating valve 22; the flue gas mixing device outlet smoke exhaust pipeline 73 is connected with the flue gas mixing device 2 and the SCR reactor device 3, and the temperature measuring device 23 is arranged on the flue gas mixing device outlet smoke exhaust pipeline 73; a plurality of catalyst layers are arranged in the SCR reactor device 3, the catalyst of the catalyst layers is vertically arranged, and in order to prevent the accumulation of particles, each layer of the SCR reactor device 3 is provided with a soot blower; the other end of the exhaust flue 74 at the outlet of the SCR reactor is connected with a flue gas heat exchanger 4, the flue gas heat exchanger 4 is provided with a bypass flue 78, the bypass flue 78 is connected with the front exhaust flue 74 and the rear exhaust flue 75, and the bypass flue 78 is provided with a regulating valve 23; the downstream of the flue gas heat exchanger 4 is also connected with an air preheater 8, a front smoke exhaust pipeline 75 is arranged between the flue gas heat exchanger 4 and the air preheater 8, and the air preheater 15 is sequentially connected with a dust remover, a desulfurization device and a chimney through a rear smoke exhaust pipeline 76; the air duct 6 connects the fan 5, the air preheater 8 and the burner 14.
In the embodiment, when the temperature measuring device 23 detects that the temperature of the exhaust gas at the outlet of the boiler is higher than a set value, the regulating valve 21 is closed, the regulating valve 22 is fully opened, the regulating valve 23 is fully opened, the exhaust gas at the outlet of the boiler is directly sent into the SCR reactor device 3 for denitration, and then is exhausted into the atmosphere after passing through the air preheater 8, the dust remover, the special desulfurization function and the chimney; when the temperature measuring device 23 detects that the temperature of the discharged smoke at the outlet of the boiler is lower than a set value, the regulating valve 21 is opened, the regulating valve 22 is closed, the regulating valve 23 is closed, the high-temperature smoke at the outlet of the hearth and the low-temperature smoke at the outlet of the boiler are mixed in the smoke mixing device 2, the temperature detected by the temperature measuring device 23 is monitored, the opening degree of the regulating valve 21 is regulated, when the detected temperature reaches the set value, the regulation is completed, the mixed smoke reaching the temperature requirement is sent into the SCR reactor device 3 for denitration, and after heat exchange and temperature reduction by the smoke heat exchanger 4, the mixed smoke is discharged into the atmosphere after.
Fig. 2 is the utility model discloses flue gas heat exchanger an embodiment heat transfer schematic diagram, as shown in the figure, flue gas and boiler after 3 denitration of SCR reactor device exchange heat in flue gas heat exchanger 4 for water, and the boiler after the intensification is sent into subordinate's economizer for water and is continued the heating, and flue gas after the cooling discharges into the atmosphere after air heater 8, dust remover, desulfurization specialty, chimney again.
Fig. 3 is the heat transfer schematic diagram of another embodiment of the flue gas heat exchanger of the utility model, as shown in the figure, flue gas and boiler export flue gas after 3 denitration of SCR reactor device exchange heat in flue gas heat exchanger 4, and flue gas after the intensification is sent into in flue gas mixing arrangement 2 and is mixed the intensification with furnace export high temperature flue gas, and flue gas after the cooling discharges the atmosphere after air heater 8, dust remover, desulfurization specialty, chimney again.
By adopting the device, when the temperature of the flue gas entering the SCR reactor device is lower than the designed temperature range, the high-temperature flue gas led out from the outlet of the boiler hearth and the low-temperature flue gas at the outlet of the boiler are mixed in the flue gas heat exchanger, and the mixed flue gas reaches the designed temperature range, so that the denitration reaction effect and the denitration efficiency are ensured; and (4) recovering heat of the denitrated flue gas through a flue gas heat exchanger.
It is obvious that the embodiments described above are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
Claims (8)
1. The utility model provides a boiler flue gas denitrification facility which characterized in that includes: the system comprises a boiler body, an SCR reactor device, and a flue gas pipeline and an air duct which are connected with each device;
the boiler flue gas denitration device also comprises a flue gas mixing device in front of the SCR reactor device and a flue gas heat exchanger behind the SCR reactor device;
the boiler body comprises a hearth, a boiler horizontal flue and a boiler vertical flue;
the flue gas pipeline comprises a hearth outlet smoke exhaust pipeline, a boiler outlet smoke exhaust pipeline, a flue gas mixing device outlet smoke exhaust pipeline and an SCR reactor outlet smoke exhaust pipeline; the furnace outlet smoke exhaust pipeline is a pipeline extending from a horizontal flue of the boiler to the outer side of the boiler, and the other side of the furnace outlet smoke exhaust pipeline is connected to the smoke mixing device; the boiler outlet smoke exhaust pipeline extends from the outlet of the vertical flue of the boiler to a pipeline outside the boiler, and the other side of the boiler outlet smoke exhaust pipeline is connected to the smoke mixing device; the outlet smoke discharge pipeline of the smoke mixing device is connected with the smoke mixing device and the SCR reactor device; the other end of the smoke exhaust pipeline at the outlet of the SCR reactor is connected with the smoke heat exchanger;
the lower stream of the flue gas heat exchanger is also connected with an air preheater, a front smoke exhaust pipeline is arranged between the flue gas heat exchanger and the air preheater, and the air preheater is sequentially connected with a dust remover, a desulfurization device and a chimney through a rear smoke exhaust pipeline; the air duct connects the fan, the air preheater and the burner.
2. The boiler flue gas denitration device according to claim 1, wherein a regulating valve is arranged on the furnace outlet smoke exhaust pipeline.
3. The boiler flue gas denitration device according to claim 1, wherein a temperature measuring device is arranged on the boiler outlet smoke exhaust pipeline.
4. The boiler flue gas denitration device according to claim 1, wherein the flue gas mixing device is provided with a bypass flue, the bypass flue is connected with the boiler outlet smoke exhaust pipeline and the flue gas mixing device outlet smoke exhaust pipeline, and the bypass flue is provided with a regulating valve.
5. The boiler flue gas denitration device according to claim 1, wherein a temperature measuring device is arranged on the flue gas exhaust pipe at the outlet of the flue gas mixing device.
6. The boiler flue gas denitration device according to claim 1, wherein a plurality of catalyst layers are arranged in the SCR reactor device; the catalyst of the catalyst layer is vertically arranged; to prevent the accumulation of particles, the SCR reactor device is equipped with soot blowers on each level.
7. The boiler flue gas denitration device according to claim 1, wherein the flue gas heat exchanger is provided with a bypass flue, the bypass flue is connected with the front smoke exhaust pipeline and the rear smoke exhaust pipeline, and the bypass flue is provided with a regulating valve.
8. The boiler flue gas denitration device according to claim 1, wherein the flue gas heat exchanger can be used as a boiler economizer and can also be used for heating boiler outlet flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921081917.3U CN210267304U (en) | 2019-07-12 | 2019-07-12 | Boiler flue gas denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921081917.3U CN210267304U (en) | 2019-07-12 | 2019-07-12 | Boiler flue gas denitration device |
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| CN210267304U true CN210267304U (en) | 2020-04-07 |
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| CN201921081917.3U Active CN210267304U (en) | 2019-07-12 | 2019-07-12 | Boiler flue gas denitration device |
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- 2019-07-12 CN CN201921081917.3U patent/CN210267304U/en active Active
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