CN219002557U - Thermal storage type heating furnace empty smoke and soot denitration process systems respectively - Google Patents
Thermal storage type heating furnace empty smoke and soot denitration process systems respectively Download PDFInfo
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- CN219002557U CN219002557U CN202223503296.8U CN202223503296U CN219002557U CN 219002557 U CN219002557 U CN 219002557U CN 202223503296 U CN202223503296 U CN 202223503296U CN 219002557 U CN219002557 U CN 219002557U
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Abstract
The utility model discloses a process system for respectively denitrating air smoke and coal smoke of a heat accumulating type heating furnace, which comprises an air smoke denitration system and a coal smoke denitration system, wherein the air smoke denitration system comprises an air smoke 1-stage plate heat exchanger, an air smoke heating mixer and an air smoke low-temperature denitration reactor, and an air smoke exhaust end of the heat accumulating type heating furnace is connected with the air smoke low-temperature denitration reactor through the air smoke 1-stage plate heat exchanger and the air smoke heating mixer in sequence; the soot gas denitration system comprises a soot 1-stage plate heat exchanger, a soot heating mixer, a soot low-temperature denitration reactor and a doping air cooler, wherein the exhaust end of the soot gas of the heat accumulating type heating furnace is connected with the soot heating mixer through the soot 1-stage plate heat exchanger, the doping air cooler and the soot heating mixer in sequence. The utility model realizes ultralow emission of nitrogen oxides in the flue gas and meets the requirement of environmental protection.
Description
Technical Field
The utility model relates to the technical field of heat accumulating type heating furnace flue gas treatment, in particular to a process system for separately denitrating empty flue gas and soot of a heat accumulating type heating furnace.
Background
At present, the nitrogen oxide emission of a regenerative heating furnace is generally 150 mg/Nm 3 The control is better and can reach 80 mg/Nm 3 About (8% reference oxygen content), with the increasing requirements of ultra-low emission standards in all places, nitrogen oxide emissions up to 50 mg/Nm are required in many places 3 Even 35 mg/Nm 3 In the following, denitration treatment of flue gas is an effective means for reducing emission of nitrogen oxides. However, the smoke discharging temperature of the regenerative heating furnace is lower, the temperature is generally about 80-100 ℃ at the initial stage of putting the heat accumulator into use, the service life and the heat exchanging capacity of the heat accumulator are reduced along with the continuous use of the heat accumulator, the smoke discharging temperature is slowly increased and is generally below 150 ℃, but the smoke temperature is required to be stabilized above 180 ℃ for a long time by the middle-low temperature denitration technology which is currently mainstream in China; meanwhile, because the combustion system of the regenerative heating furnace has a special structure, when the reversing valve performs reversing action, the instantaneous value of the CO content in the smoke gas is very high and is generally higher than 10000ppm, and even if some heating furnaces have a gas back blowing technology, the CO content is generally about 3000ppm, so that the smoke gas and the empty smoke can not be mixed and discharged, and otherwise, the risk of explosion exists.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model provides a process system for separately denitrating empty smoke and soot of a heat accumulating type heating furnace, which realizes ultralow emission of nitrogen oxides in the smoke and meets the requirement of environmental protection.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the technical system comprises an empty smoke denitration system and a coal smoke denitration system, wherein an empty smoke exhaust end of the thermal storage type heating furnace is connected with the empty smoke denitration system, and a coal smoke exhaust end of the thermal storage type heating furnace is connected with the coal smoke denitration system;
the air smoke denitration system comprises an air smoke 1-stage plate heat exchanger, an air smoke heating mixer and an air smoke low-temperature denitration reactor, wherein an air smoke exhaust end of the heat accumulating type heating furnace is connected with the air smoke low-temperature denitration reactor through the air smoke 1-stage plate heat exchanger and the air smoke heating mixer in sequence;
the soot gas denitration system comprises a soot 1-stage plate heat exchanger, a soot heating mixer, a soot low-temperature denitration reactor and a doping air cooler, wherein the exhaust end of the soot gas of the heat accumulating type heating furnace is connected with the soot heating mixer through the soot 1-stage plate heat exchanger, the doping air cooler and the soot heating mixer in sequence.
According to the technical scheme, the air smoke exhaust end of the heat accumulating type heating furnace is connected with the inlet end a of the air smoke 1-stage plate heat exchanger, the outlet end b of the air smoke 1-stage plate heat exchanger is connected with the inlet end of the air smoke low-temperature denitration reactor through the air smoke heating mixer, the outlet end of the air smoke low-temperature denitration reactor is connected with the inlet end c of the air smoke 1-stage plate heat exchanger, and the outlet end d of the air smoke 1-stage plate heat exchanger is connected with the air smoke booster fan.
According to the technical scheme, the exhaust end of the air-smoke booster fan is connected with the air-smoke chimney.
According to the technical scheme, the exhaust end of the soot gas of the regenerative heating furnace is connected with the inlet end a of the soot 1-stage plate heat exchanger, the outlet end b of the soot 1-stage plate heat exchanger is connected with the inlet end of the soot low-temperature denitration reactor through the doping air cooler and the soot heating mixer, the outlet end of the soot low-temperature denitration reactor is connected with the inlet end c of the soot 1-stage plate heat exchanger, and the outlet end d of the soot 1-stage plate heat exchanger is connected with the soot booster fan.
According to the technical scheme, the exhaust end of the soot booster fan is connected with the soot chimney.
According to the technical scheme, the inlet end of the air-smoke heating mixer is also connected with the outlet end of the air-smoke hot blast stove, and the inlet end of the air-smoke hot blast stove is connected with coal gas and combustion-supporting air.
According to the technical scheme, the inlet end of the soot heating mixer is also connected with the outlet end of the soot hot blast stove, and the inlet end of the soot hot blast stove is connected with coal gas and combustion-supporting air.
According to the technical scheme, the inlet end of the blending air cooler is also connected with the outlet end of the soot hot blast stove; and a part of the soot gas at the outlet end of the soot hot blast stove extracted by the blending air cooler enters a soot heating mixer together with the soot gas from the soot 1-stage plate heat exchanger.
According to the technical scheme, the inlet end of the air-fume low-temperature denitration reactor is also connected with an ammonia gas exhaust end.
According to the technical scheme, the inlet end of the low-temperature denitration reactor for soot is also connected with an ammonia gas exhaust end.
The utility model has the following beneficial effects:
1. according to the utility model, the hollow smoke and the soot in the smoke of the heat accumulating type heating furnace are respectively denitrated, so that the ultralow emission of nitrogen oxides in the smoke is realized, and the requirement of environmental protection is met.
2. According to the utility model, the temperature of the flue gas of the heat accumulating type heating furnace is raised, so that the flue gas temperature meets the denitration temperature requirement, and the heat of the raised flue gas is recycled by a heat exchanger; the air smoke adopts high-temperature smoke generated by an air smoke hot blast stove to directly mix and heat; the utility model adopts a direct heating mode of the flue gas, but the outlet temperature of the flue gas heating hot blast stove is controlled below the corresponding temperature, and if the outlet temperature of the hot blast stove is reduced by adopting cold air doping, additional energy consumption is increased.
Drawings
FIG. 1 is a schematic structural diagram of a hollow smoke denitration system according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a flue gas denitration system according to an embodiment of the present utility model;
in the figure, a 1-air smoke 1-stage plate heat exchanger, a 2-air smoke heating mixer, a 3-air smoke low-temperature denitration reactor, a 4-air smoke booster fan, a 5-air smoke hot blast stove, a 6-coal smoke 1-stage plate heat exchanger, a 7-coal smoke heating mixer, an 8-coal smoke low-temperature denitration reactor, a 9-coal smoke booster fan, a 10-coal smoke hot blast stove, an 11-blending air cooler, a 12-coal smoke exhaust end, a 13-air smoke exhaust end and a 14-ammonia exhaust end.
Detailed Description
The utility model will now be described in detail with reference to the drawings and examples.
Referring to fig. 1 to 2, a process system for separately denitrating empty smoke and soot of a regenerative heating furnace in an embodiment of the present utility model includes an empty smoke denitration system and a soot smoke denitration system, wherein an empty smoke exhaust end 13 of the regenerative heating furnace is connected with the empty smoke denitration system, and a soot smoke exhaust end 12 of the regenerative heating furnace is connected with the soot smoke denitration system;
the empty smoke denitration system comprises an empty smoke 1-stage plate heat exchanger 1, an empty smoke heating mixer 2 and an empty smoke low-temperature denitration reactor 3, wherein an empty smoke exhaust end 13 of the heat accumulating type heating furnace is connected with the empty smoke low-temperature denitration reactor 3 through the empty smoke 1-stage plate heat exchanger 1 and the empty smoke heating mixer 2 in sequence;
the soot flue gas denitration system comprises a soot 1-stage plate heat exchanger 6, a soot heating mixer 7, a soot low-temperature denitration reactor 8 and a doping air cooler 11, wherein a soot flue gas exhaust end 12 of a heat accumulating type heating furnace is connected with the soot heating mixer 7 through the soot 1-stage plate heat exchanger 6, the doping air cooler 11 and the soot heating mixer 7 in sequence.
Further, an air smoke exhaust end 13 of the heat accumulating type heating furnace is connected with an inlet end a of the air smoke 1-stage plate heat exchanger 1, an outlet end b of the air smoke 1-stage plate heat exchanger 1 is connected with an inlet end of the air smoke low-temperature denitration reactor 3 through the air smoke heating mixer 2, an outlet end of the air smoke low-temperature denitration reactor 3 is connected with an inlet end c of the air smoke 1-stage plate heat exchanger 1, and an outlet end d of the air smoke 1-stage plate heat exchanger 1 is connected with an air smoke booster fan 4.
Further, the exhaust end of the air-smoke booster fan 4 is connected with an air-smoke chimney.
The air-smoke 1-stage plate heat exchanger 1 is internally provided with a pipeline connected between an inlet end a and an outlet end b, a pipeline connected between an inlet end c and an outlet end d, and a pipeline between the end a and the end b and a pipeline between the end c and the end d.
Further, a smoke exhaust end 12 of the regenerative heating furnace is connected with an inlet a end of the smoke 1-stage plate heat exchanger 6, an outlet b end of the smoke 1-stage plate heat exchanger 6 is connected with an inlet end of the smoke low-temperature denitration reactor 8 through a smoke heating mixer 7 by a doping air cooler 11, an outlet end of the smoke low-temperature denitration reactor 8 is connected with an inlet c end of the smoke 1-stage plate heat exchanger 6, and an outlet d end of the smoke 1-stage plate heat exchanger 6 is connected with a smoke booster fan 9.
Further, the exhaust end of the soot booster fan 9 is connected with a soot stack.
And a pipeline is connected between an inlet end a and an outlet end b in the soot 1-stage plate heat exchanger, a pipeline is connected between an inlet end c and an outlet end d, and the pipeline between the end a and the end b and the pipeline between the end c and the end d perform heat exchange in the soot 1-stage plate heat exchanger.
Further, the inlet end of the air-fume heating mixer 2 is also connected with the outlet end of the air-fume hot blast stove 5, and the inlet end of the air-fume hot blast stove 5 is connected with blast furnace gas from a main pipe of a homeowner and combustion air from a combustion-supporting fan.
Further, the inlet end of the soot heating mixer 7 is also connected with the outlet end of the soot hot blast stove 10, and the inlet end of the soot hot blast stove 10 is connected with blast furnace gas from a main pipe of a homeowner and combustion air from a combustion fan.
Further, the inlet end of the blending air cooler 11 is also connected with the outlet end of the soot hot blast stove 10; the blending air cooler 11 extracts a part of the soot gas at the outlet end of the soot hot blast stove 10 and enters the soot heating mixer 7 together with the soot gas from the soot 1-stage plate heat exchanger 6.
Further, the inlet end of the low-temperature denitration reactor 3 for empty smoke is also connected with an ammonia gas exhaust end 14 from an ammonia area of an owner.
Further, the inlet end of the low-temperature denitration reactor 8 for soot is also connected with an ammonia gas exhaust end 14 from an ammonia area of an owner.
The working principle of the utility model is as follows:
(1) The 80-120 ℃ soot gas generated by the regenerative heating furnace enters the soot 1-stage plate heat exchanger 6 to exchange heat and raise the temperature to 150-200 ℃; the high-temperature flue gas of 950 ℃ is generated by the flue gas hot blast stove 10, and the flue gas is extracted by the doping air cooler 11 to be cooled to about 650 ℃, then enters the flue gas heating mixer 7 to be doped and heated, the temperature of the flue gas is increased to 180-230 ℃, and the flue gas reaches the temperature required by low-temperature denitration. Then enters a low-temperature denitration reactor 8 for denitration, finally is cooled to 110-150 ℃ through a 1-stage plate heat exchanger 6, and is discharged into a soot chimney through a soot booster fan 9.
(2) The air smoke of 80-120 ℃ generated by the heat accumulating type heating furnace enters the air smoke 1-stage plate heat exchanger 1 to exchange heat and heat to 150-200 ℃, then is mixed with the high-temperature smoke of 950 ℃ generated by the air smoke hot blast stove 5 to heat to 180-230 ℃ to reach the temperature above the temperature required by low-temperature denitration, then enters the air smoke low-temperature denitration reactor 3 to perform denitration, the denitrated smoke enters the air smoke 1-stage plate heat exchanger 1 to cool to 110-150 ℃, and finally is discharged into an air smoke chimney through the air smoke booster fan 4.
After the reaction flow, the denitration process is finished, and at the moment, the ultralow-value emission of nitrogen oxides in the flue gas of the regenerative heating furnace is realized, so that the environmental protection standard is met.
The foregoing is merely illustrative of the present utility model and is not intended to limit the scope of the utility model, which is defined by the claims and their equivalents.
Claims (10)
1. The technical system for separately denitration of the empty smoke and the soot of the regenerative heating furnace is characterized by comprising an empty smoke denitration system and a soot smoke denitration system, wherein the empty smoke exhaust end of the regenerative heating furnace is connected with the empty smoke denitration system, and the soot smoke exhaust end of the regenerative heating furnace is connected with the soot smoke denitration system;
the air smoke denitration system comprises an air smoke 1-stage plate heat exchanger, an air smoke heating mixer and an air smoke low-temperature denitration reactor, wherein an air smoke exhaust end of the heat accumulating type heating furnace is connected with the air smoke low-temperature denitration reactor through the air smoke 1-stage plate heat exchanger and the air smoke heating mixer in sequence;
the soot gas denitration system comprises a soot 1-stage plate heat exchanger, a soot heating mixer, a soot low-temperature denitration reactor and a doping air cooler, wherein the exhaust end of the soot gas of the heat accumulating type heating furnace is connected with the soot heating mixer through the soot 1-stage plate heat exchanger, the doping air cooler and the soot heating mixer in sequence.
2. The process system for denitration of the air smoke and the coal smoke of the heat accumulating type heating furnace according to claim 1, wherein an air smoke exhaust end of the heat accumulating type heating furnace is connected with an inlet end a of an air smoke 1-stage plate heat exchanger, an outlet end b of the air smoke 1-stage plate heat exchanger is connected with an inlet end of an air smoke low-temperature denitration reactor through an air smoke heating mixer, an outlet end of the air smoke low-temperature denitration reactor is connected with an inlet end c of the air smoke 1-stage plate heat exchanger, and an outlet end d of the air smoke 1-stage plate heat exchanger is connected with an air smoke booster fan.
3. The process system for denitration of air and soot of a regenerative heating furnace according to claim 2, wherein an exhaust end of the air-soot booster fan is connected with an air-soot chimney.
4. The process system for denitration of empty smoke and soot of a regenerative heating furnace according to claim 1, wherein the exhaust end of the soot smoke of the regenerative heating furnace is connected with the inlet end a of a soot 1-stage plate heat exchanger, the outlet end b of the soot 1-stage plate heat exchanger is connected with the inlet end of a soot low-temperature denitration reactor through a doping air cooler and a soot heating mixer, the outlet end of the soot low-temperature denitration reactor is connected with the inlet end c of the soot 1-stage plate heat exchanger, and the outlet end d of the soot 1-stage plate heat exchanger is connected with a soot booster fan.
5. The process system for denitration of empty smoke and soot of a regenerative heating furnace according to claim 4, wherein an exhaust end of the soot booster fan is connected with a soot chimney.
6. The process system for denitration of air and soot of a regenerative heating furnace according to claim 1, wherein the inlet end of the air-soot heating mixer is also connected with the outlet end of the air-soot hot blast stove, and the inlet end of the air-soot hot blast stove is connected with coal gas and combustion air.
7. The process system for denitration of air and soot of a regenerative heating furnace according to claim 1, wherein the inlet end of the soot heating mixer is also connected with the outlet end of the soot hot blast stove, and the inlet end of the soot hot blast stove is connected with coal gas and combustion air.
8. The process system for separately denitrating empty smoke and soot of a regenerative heating furnace according to claim 7, wherein the inlet end of the air cooler is also connected with the outlet end of the soot hot blast stove; and a part of the soot gas at the outlet end of the soot hot blast stove extracted by the blending air cooler enters a soot heating mixer together with the soot gas from the soot 1-stage plate heat exchanger.
9. The process system for separately denitrating empty smoke and soot of a regenerative heating furnace according to claim 1, wherein the inlet end of the empty smoke low-temperature denitration reactor is also connected with an ammonia gas exhaust end.
10. The process system for separately denitrating empty smoke and soot in a regenerative heating furnace according to claim 1, wherein the inlet end of the low-temperature denitration reactor for soot is further connected with an ammonia gas exhaust end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223503296.8U CN219002557U (en) | 2022-12-27 | 2022-12-27 | Thermal storage type heating furnace empty smoke and soot denitration process systems respectively |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223503296.8U CN219002557U (en) | 2022-12-27 | 2022-12-27 | Thermal storage type heating furnace empty smoke and soot denitration process systems respectively |
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| CN219002557U true CN219002557U (en) | 2023-05-12 |
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| CN202223503296.8U Active CN219002557U (en) | 2022-12-27 | 2022-12-27 | Thermal storage type heating furnace empty smoke and soot denitration process systems respectively |
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