CN213687922U - Cascade utilization system for flue gas waste heat of alkali furnace - Google Patents
Cascade utilization system for flue gas waste heat of alkali furnace Download PDFInfo
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- CN213687922U CN213687922U CN202022736400.2U CN202022736400U CN213687922U CN 213687922 U CN213687922 U CN 213687922U CN 202022736400 U CN202022736400 U CN 202022736400U CN 213687922 U CN213687922 U CN 213687922U
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Abstract
The utility model discloses a flue gas waste heat cascade utilization system of an alkali furnace, which comprises an alkali furnace, a bag-type dust collector, a tubular GGH, an air blower, a hot blast stove, an SCR (Selective catalytic reduction) denitration device, a first-stage low-temperature economizer, a second-stage low-temperature economizer, a draught fan and a chimney, wherein the SCR denitration device adopts a high-temperature metal catalyst, the flue gas inlet temperature of the SCR denitration device is ensured by two means of flue-smoke heat exchange of the tubular GGH and hot flue gas mixing at the outlet of the hot blast stove, the low-temperature economizer is arranged in two stages, the first-stage low-temperature economizer is arranged at the flue gas outlet at the high-temperature side of the tubular GGH to heat the water of a high-pressure heater between power vehicles, the second-stage low-temperature, the system can stably reduce the emission concentration of nitrogen oxides of the alkali furnace, realize the gradient utilization of the waste heat of the flue gas, and improve the energy utilization efficiency and the economical efficiency of the system operation.
Description
Technical Field
The utility model belongs to the technical field of flue gas waste heat recovery, a alkali furnace flue gas waste heat cascade utilization system is related to.
Background
In recent years, the energy environmental protection system of China is continuously healthy, and strict energy environmental protection standards are continuously provided. In the technical policy of pollution control in the paper industry released by the ministry of environmental protection, emission control of atmospheric pollutants in the alkali furnace is emphasized and research and development of the technology for reducing emission of atmospheric pollutants in the alkali furnace is encouraged. Because the exhaust gas temperature of the alkali furnace is higher, if a high-temperature catalyst SCR device is adopted, the exhaust gas temperature is further increased, and the exhaust gas is directly discharged from a chimney, so that the energy waste is larger. In order to reduce the emission concentration of nitrogen oxides in the alkali furnace and save energy as much as possible, a system for recovering the waste heat of the flue gas and performing cascade utilization while stably reducing the emission concentration of nitrogen oxides in the alkali furnace is needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a soda stove flue gas waste heat cascade utilization system, this system can stably reduce soda stove nitrogen oxide emission concentration, retrieves high temperature flue gas waste heat simultaneously and in addition the cascade utilization, improves the economic nature of system operation.
In order to achieve the purpose, the stepped utilization system for the flue gas waste heat of the alkali furnace comprises the alkali furnace, a bag-type dust collector, a tubular GGH, an SCR denitration device, a primary low-temperature economizer, a secondary low-temperature economizer, an induced draft fan and a chimney;
the flue gas outlet of the alkali furnace is communicated with the flue gas inlet of the bag-type dust collector, the flue gas outlet of the bag-type dust collector is communicated with the low-temperature flue gas side inlet of the tubular GGH, the low-temperature flue gas side outlet of the tubular GGH is communicated with the flue gas inlet of the SCR denitration device, the flue gas outlet of the SCR denitration device is communicated with the high-temperature flue gas inlet of the tubular GGH, the high-temperature flue gas outlet of the tubular GGH is communicated with the flue gas inlet of the first-stage low-temperature economizer, the flue gas outlet of the first-stage low-temperature economizer is communicated with the flue gas inlet of the second-stage low-temperature economizer, the flue gas outlet of the second-stage low-temperature economizer is.
The SCR denitration device is characterized by further comprising a blower and a hot blast stove, an air outlet of the blower is communicated with an air inlet of the hot blast stove, and a flue gas outlet of the hot blast stove is communicated with a flue gas inlet of the SCR denitration device.
The catalyst in the SCR denitration device adopts a high-temperature metal catalyst.
The fuel of the hot blast stove is natural gas.
The device also comprises a secondary low-temperature economizer booster pump, a primary low-temperature economizer booster pump, a No. 8 low-pressure heater, a No. 7 low-pressure heater, a No. 6 low-pressure heater, a No. 5 low-pressure heater, a deaerator, a No. 3 high-pressure heater, a No. 2 high-pressure heater and a No. 1 high-pressure heater;
the No. 8 low-pressure heater, the No. 7 low-pressure heater, the No. 6 low-pressure heater, the No. 5 low-pressure heater, the deaerator, the No. 3 high-pressure heater, the No. 2 high-pressure heater and the No. 1 high-pressure heater are communicated in sequence;
a cold water inlet of the first-stage low-temperature economizer is communicated with an outlet of a booster pump of the first-stage low-temperature economizer, a booster inlet of the first-stage low-temperature economizer is communicated with an inlet of a No. 3 high-pressure heater, and a cold water outlet of the first-stage low-temperature economizer is communicated with an outlet of a No. 2 high-pressure heater;
the cold water inlet of the secondary low-temperature economizer is communicated with the outlet of a booster pump of the secondary low-temperature economizer, the inlet of the booster pump of the secondary low-temperature economizer is communicated with the inlet of the No. 8 low-pressure heater and the outlet of the No. 7 low-pressure heater, and the cold water outlet of the secondary low-temperature economizer is communicated with the outlet of the No. 6 low-pressure heater.
The inlet of the first-stage low-temperature economizer booster pump is communicated with the inlet of the No. 3 high-pressure heater through a first electric isolating valve.
And a cold water outlet of the first-stage low-temperature economizer is communicated with an outlet of the No. 2 high-pressure heater through a second electric isolating valve.
And a cold water outlet of the secondary low-temperature economizer is communicated with an outlet of the No. 6 low-pressure heater through a third electric isolating valve.
And an inlet of the second-stage low-temperature economizer booster pump is communicated with an outlet of the No. 7 low-pressure heater through a fourth electric isolating valve.
And the inlet of the second-stage low-temperature economizer booster pump is communicated with the inlet of the No. 8 low-pressure heater through a fifth electric isolating valve.
The utility model discloses following beneficial effect has:
alkali furnace flue gas waste heat cascade utilization system when concrete operation, utilize tubular GGH to heat the flue gas temperature of sack cleaner output and heat up, the high temperature flue gas waste heat of make full use of SCR denitrification facility export reduces the external heat supply of system. Simultaneously, high-temperature flue gas output by the hot blast stove is mixed with flue gas output by the low-temperature side of the tubular GGH, so that the temperature of the flue gas entering the SCR denitration device is increased, and the temperature of the flue gas is ensured to be within the normal working range of a high-temperature metal catalyst of the SCR denitration device. The hot blast stove adopts natural gas as fuel, and the pollutant concentration in the flue gas at the outlet of the hot blast stove is lower, so that the influence on the pollutant concentration at the outlet of the chimney is reduced. High-temperature flue gas waste heat at the outlet of the SCR denitration device is recovered through the primary low-temperature economizer and the secondary low-temperature economizer, according to the difference of flue gas temperature intervals, the flue gas waste heat recovered by the primary low-temperature economizer heats the feed water of a high-pressure heater between power vehicles, and the flue gas waste heat recovered by the secondary low-temperature economizer heats the feed water of a low-pressure heater between the power vehicles, so that the cascade utilization of the flue gas waste heat is realized, and the energy utilization efficiency and the economical efficiency of system operation are improved. The heat exchange tubes of the first-stage low-temperature economizer and the second-stage low-temperature economizer are made of different materials, so that the safe operation of the heat exchange tubes is guaranteed, and the project investment is reduced.
Drawings
Fig. 1 is a schematic view of the present invention.
Wherein, 1 is an alkali furnace, 2 is a bag-type dust collector, 3 is a tubular GGH, 4 is a blower, 5 is a hot blast furnace, 6 is an SCR denitration device, 7 is a primary low-temperature economizer, 8 is a secondary low-temperature economizer, 9 is a draught fan, 10 is a chimney, 11 is a No. 8 low-pressure heater, 12 is a No. 7 low-pressure heater, 13 is a No. 6 low-pressure heater, 14 is a No. 5 low-pressure heater, 15 is a deaerator, 16 is a No. 3 high-pressure heater, 17 is a No. 2 high-pressure heater, 18 is a No. 1 high-pressure heater, 19 is a fifth electric isolating valve, 20 is a secondary low-temperature economizer booster pump, and 21 is a primary low-temperature economizer booster pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the cascade utilization system for flue gas waste heat of alkali furnace of the present invention comprises an alkali furnace 1, a bag-type dust collector 2, a tubular GGH3, an SCR denitration device 6, a primary low-temperature economizer 7, a secondary low-temperature economizer 8, an induced draft fan 9 and a chimney 10; the flue gas outlet of the alkali furnace 1 is communicated with the flue gas inlet of the bag-type dust collector 2, the flue gas outlet of the bag-type dust collector 2 is communicated with the low-temperature flue gas side inlet of the tube-type GGH3, the low-temperature flue gas side outlet of the tube-type GGH3 is communicated with the flue gas inlet of the SCR denitration device 6, the flue gas outlet of the SCR denitration device 6 is communicated with the high-temperature flue gas inlet of the tube-type GGH3, the high-temperature flue gas outlet of the tube-type GGH3 is communicated with the flue gas inlet of the first-level low-temperature economizer 7, the flue gas outlet of the first-level low-temperature economizer 7 is communicated with the flue gas inlet of the second-level low-temperature economizer 8, the flue gas outlet of the second-level low.
The utility model discloses still include air-blower 4 and hot-blast furnace 5, the air outlet of air-blower 4 is linked together with the air inlet of hot-blast furnace 5, and the exhanst gas outlet of hot-blast furnace 5 is linked together with SCR denitrification facility 6's flue gas entry.
The catalyst in the SCR denitration device 6 adopts a high-temperature metal catalyst; the fuel of the hot blast stove 5 adopts natural gas.
The utility model also comprises a second-stage low-temperature economizer booster pump 20, a first-stage low-temperature economizer booster pump 21, a No. 8 low-pressure heater 11, a No. 7 low-pressure heater 12, a No. 6 low-pressure heater 13, a No. 5 low-pressure heater 14, a deaerator 15, a No. 3 high-pressure heater 16, a No. 2 high-pressure heater 17 and a No. 1 high-pressure heater 18; a No. 8 low-pressure heater 11, a No. 7 low-pressure heater 12, a No. 6 low-pressure heater 13, a No. 5 low-pressure heater 14, a deaerator 15, a No. 3 high-pressure heater 16, a No. 2 high-pressure heater 17 and a No. 1 high-pressure heater 18 are communicated in sequence; a cold water inlet of the primary low-temperature economizer 7 is communicated with an outlet of a primary low-temperature economizer booster pump 21, an inlet of the primary low-temperature economizer booster pump 21 is communicated with an inlet of a No. 3 high-pressure heater 16, and a cold water outlet of the primary low-temperature economizer 7 is communicated with an outlet of a No. 2 high-pressure heater 17; the cold water inlet of the secondary low-temperature economizer 8 is communicated with the outlet of a secondary low-temperature economizer booster pump 20, the inlet of the secondary low-temperature economizer booster pump 20 is communicated with the inlet of a No. 8 low-pressure heater 11 and the outlet of a No. 7 low-pressure heater 12, and the cold water outlet of the secondary low-temperature economizer 8 is communicated with the outlet of a No. 6 low-pressure heater 13.
An inlet of the first-stage low-temperature economizer booster pump 21 is communicated with an inlet of the No. 3 high-pressure heater 16 through a first electric isolating valve; a cold water outlet of the first-stage low-temperature economizer 7 is communicated with an outlet of a No. 2 high-pressure heater 17 through a second electric isolating valve; a cold water outlet of the secondary low-temperature economizer 8 is communicated with an outlet of the No. 6 low-pressure heater 13 through a third electric isolating valve; an inlet of the second-stage low-temperature economizer booster pump 20 is communicated with an outlet of the No. 7 low-pressure heater 12 through a fourth electric isolating valve; the inlet of the secondary low-temperature economizer booster pump 20 is communicated with the inlet of the No. 8 low-pressure heater 11 through a fifth electric isolating valve 19.
The temperature of 180 ℃ flue gas output by the bag-type dust collector 2 is increased to 270 ℃ after passing through the pipe type GGH3, the flue gas is mixed with high-temperature flue gas output by the hot blast stove 5 and then enters the SCR denitration device 6 to be heated to 380 ℃, the high-temperature flue gas output by the SCR denitration device 6 is cooled to 280 ℃ after passing through the pipe type GGH3 and then enters the primary low-temperature economizer 7 to be cooled to 220 ℃, then enters the secondary low-temperature economizer 8 to be cooled to 100 ℃, and finally enters the chimney 10 through the induced draft fan 9 and finally is discharged into the atmosphere.
The condensed water output by the No. 8 low-pressure heater 11 is mixed with the condensed water output by the No. 7 low-pressure heater 12, the temperature of the mixed condensed water is 80 ℃, the mixed condensed water enters the second-stage low-temperature economizer 8 to be heated to 100 ℃, then the mixed condensed water is mixed with the condensed water output by the No. 6 low-pressure heater 13 and enters the No. 5 low-pressure heater 14, the 180 ℃ condensed water output by the deaerator 15 is divided into two paths, one path of the condensed water enters the No. 3 high-pressure heater 16, the other path of the condensed water enters the first-stage low-temperature economizer 7 to be heated to 250 ℃, and the condensed water output by the first-stage low-temperature economizer 7 enters the No. 1 high-.
Claims (10)
1. A cascade utilization system for flue gas waste heat of an alkali furnace is characterized by comprising the alkali furnace (1), a bag-type dust collector (2), a tubular GGH (3), a blower (4), a hot blast stove (5), an SCR denitration device (6), a primary low-temperature economizer (7), a secondary low-temperature economizer (8), a draught fan (9) and a chimney (10);
the flue gas outlet of the alkali furnace (1) is communicated with the flue gas inlet of the bag-type dust collector (2), the flue gas outlet of the bag-type dust collector (2) is communicated with the low-temperature flue gas side inlet of the tube-type GGH (3), the low-temperature flue gas side outlet of the tube-type GGH (3) is communicated with the flue gas inlet of the SCR denitration device (6), the flue gas outlet of the SCR denitration device (6) is communicated with the high-temperature flue gas side inlet of the tube-type GGH (3), the high-temperature flue gas side outlet of the tube-type GGH (3) is communicated with the flue gas inlet of the primary low-temperature economizer (7), the flue gas outlet of the primary low-temperature economizer (7) is communicated with the flue gas inlet of the secondary low-temperature economizer (8), the flue gas outlet of the secondary low-temperature economizer (8) is communicated with the flue gas inlet of the induced draft fan (9.
2. The alkali furnace flue gas waste heat cascade utilization system of claim 1, further comprising a blower (4) and a hot blast stove (5), wherein an air outlet of the blower (4) is communicated with an air inlet of the hot blast stove (5), and a flue gas outlet of the hot blast stove (5) is communicated with a flue gas inlet of the SCR denitration device (6).
3. The alkali furnace flue gas waste heat gradient utilization system according to claim 1, wherein a catalyst in the SCR denitration device (6) is a high-temperature metal catalyst.
4. The cascade utilization system for the residual heat of flue gas of the alkali furnace according to claim 1, wherein the fuel of the hot blast stove (5) is natural gas.
5. The alkali furnace flue gas waste heat cascade utilization system of claim 1, further comprising a secondary low-temperature economizer booster pump (20), a primary low-temperature economizer booster pump (21), a No. 8 low-pressure heater (11), a No. 7 low-pressure heater (12), a No. 6 low-pressure heater (13), a No. 5 low-pressure heater (14), a deaerator (15), a No. 3 high-pressure heater (16), a No. 2 high-pressure heater (17) and a No. 1 high-pressure heater (18);
the No. 8 low-pressure heater (11), the No. 7 low-pressure heater (12), the No. 6 low-pressure heater (13), the No. 5 low-pressure heater (14), the deaerator (15), the No. 3 high-pressure heater (16), the No. 2 high-pressure heater (17) and the No. 1 high-pressure heater (18) are communicated in sequence;
a cold water inlet of the primary low-temperature economizer (7) is communicated with an outlet of a primary low-temperature economizer booster pump (21), an inlet of the primary low-temperature economizer booster pump (21) is communicated with an inlet of a No. 3 high-pressure heater (16), and a cold water outlet of the primary low-temperature economizer (7) is communicated with an outlet of a No. 2 high-pressure heater (17);
a cold water inlet of the secondary low-temperature economizer (8) is communicated with an outlet of a booster pump (20) of the secondary low-temperature economizer, an inlet of the booster pump (20) of the secondary low-temperature economizer is communicated with an inlet of a No. 8 low-pressure heater (11) and an outlet of a No. 7 low-pressure heater (12), and a cold water outlet of the secondary low-temperature economizer (8) is communicated with an outlet of a No. 6 low-pressure heater (13).
6. The stepped utilization system for the flue gas waste heat of the alkali furnace as claimed in claim 5, wherein an inlet of a first-stage low-temperature economizer booster pump (21) is communicated with an inlet of a No. 3 high-pressure heater (16) through a first electric isolating valve.
7. The stepped utilization system for the flue gas waste heat of the alkali furnace as claimed in claim 6, wherein a cold water outlet of the primary low-temperature economizer (7) is communicated with an outlet of a No. 2 high-pressure heater (17) through a second electric isolation valve.
8. The stepped utilization system for the flue gas waste heat of the alkali furnace as claimed in claim 7, wherein a cold water outlet of the secondary low-temperature economizer (8) is communicated with an outlet of a No. 6 low-pressure heater (13) through a third electric isolation valve.
9. The stepped utilization system for the flue gas waste heat of the alkali furnace as claimed in claim 8, wherein an inlet of the secondary low-temperature economizer booster pump (20) is communicated with an outlet of the No. 7 low-pressure heater (12) through a fourth electric isolation valve.
10. The stepped utilization system for the flue gas waste heat of the alkali furnace as claimed in claim 9, wherein an inlet of the secondary low-temperature economizer booster pump (20) is communicated with an inlet of the No. 8 low-pressure heater (11) through a fifth electric isolating valve (19).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112304105A (en) * | 2020-11-23 | 2021-02-02 | 西安西热锅炉环保工程有限公司 | Cascade utilization system for flue gas waste heat of alkali furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112304105A (en) * | 2020-11-23 | 2021-02-02 | 西安西热锅炉环保工程有限公司 | Cascade utilization system for flue gas waste heat of alkali furnace |
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