CN211435748U - Desulfurization, dust removal and denitration device for sintering flue gas - Google Patents
Desulfurization, dust removal and denitration device for sintering flue gas Download PDFInfo
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- CN211435748U CN211435748U CN201921449987.XU CN201921449987U CN211435748U CN 211435748 U CN211435748 U CN 211435748U CN 201921449987 U CN201921449987 U CN 201921449987U CN 211435748 U CN211435748 U CN 211435748U
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The utility model discloses a desulfurization, dust removal and denitration device for sintering flue gas, which comprises a semi-dry desulfurization system, a bag-type dust remover and a denitration system; the semidry desulfurization system comprises a liquid filling tank and an absorption tower, wherein the liquid filling tank is connected with a top tank positioned above the absorption tower, and the top tank is connected with the absorption tower; a rotary spraying device is arranged in the absorption tower; the bag-type dust collector comprises a plurality of filter chambers, and filter bags are arranged in the filter chambers; the upper end of the filtering chamber is provided with a gas purifying chamber, and the lower end of the filtering chamber is provided with an ash bucket; an off-line valve is arranged in the bag-type dust collector; the denitration system comprises a flue gas heat exchanger, wherein the upper part of the cold end of the flue gas heat exchanger is connected with a combustor, the combustor is connected with a denitration reactor, and the denitration reactor is connected with the hot end of the flue gas heat exchanger; and a supercharger is connected below the hot end of the flue gas heat exchanger. The utility model discloses the desulfurization dust removal and the denitrification facility of sintering flue gas, SOx/NOx control and dust removal rate are high, simple structure, and it is convenient to implement.
Description
Technical Field
The utility model relates to a desulfurization dust removal and denitrification facility of sintering flue gas.
Background
According to the ultralow emission standard of atmospheric pollutants in the steel industry, the emission limit values of particulate matters, sulfur dioxide and nitrogen oxides are respectively 10 mg/cubic meter, 35 mg/cubic meter and 50 mg/cubic meter under the condition that the flue gas of a sintering machine head (pellet roasting) contains 16% of reference oxygen. Emission limits of particulate matters, sulfur dioxide and nitrogen oxides in other processes are respectively 10 mg/cubic meter, 50 mg/cubic meter and 150 mg/cubic meter. The emission limit is far lower than the special emission limit of atmospheric pollutants of 40 mg/cubic meter, 180 mg/cubic meter and 300 mg/cubic meter in the related national standard.
With the development of industry and the improvement of living standard of people, the desire for energy is increasing, and sulfur dioxide and nitrogen oxide in sintering flue gas become one of the main causes of air pollution. The reduction of the pollution of sulfur dioxide and nitrogen oxides is a urgent need for the treatment of the current atmospheric environment. Therefore, a desulfurization, dust removal and denitration device for sintering flue gas, which has a simple structure and high desulfurization, denitration and dust removal efficiency, is urgently needed at present.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the aforesaid not enough, provide a simple structure, desulfurization denitration and the high desulfurization dust removal and the denitrification facility of sintering flue gas of dust collection efficiency.
The purpose of the utility model is realized like this:
a desulfurization, dust removal and denitration device for sintering flue gas comprises a semi-dry desulfurization system, a bag-type dust remover and a denitration system, wherein the bag-type dust remover is arranged behind the semi-dry desulfurization system, and the denitration system is arranged behind the bag-type dust remover;
the semi-dry desulfurization system comprises a liquid filling tank and an absorption tower, wherein the liquid filling tank is connected with a top tank positioned above the absorption tower, and the top tank is connected with the absorption tower; a rotary spraying device is arranged in the absorption tower; a dust gas outlet is formed in the side surface of the absorption tower; the bottom of the absorption tower is provided with an ash discharge device;
the bag-type dust collector comprises a plurality of filter chambers, and filter bags are arranged in the filter chambers; the upper end of the filtering chamber is provided with a gas purifying chamber, and the end part of the gas purifying chamber is provided with a gas purifying outlet; an ash hopper is arranged at the lower end of the filtering chamber, an air inlet is arranged on the side surface of the ash hopper, and an ash conveying device is arranged at the bottom of the ash hopper; an off-line valve is arranged in the bag-type dust collector; a dust gas outlet of the semidry desulfurization system is connected with an air inlet of a bag-type dust collector;
the denitration system comprises a flue gas heat exchanger, and the bag-type dust collector is connected with the cold end of the flue gas heat exchanger; the upper part of the cold end of the flue gas heat exchanger is connected with a burner, the burner is connected with a denitration reactor, and the denitration reactor is connected with the hot end of the flue gas heat exchanger;
and a supercharger is connected below the hot end of the flue gas heat exchanger.
The utility model discloses a desulfurization, dust removal and denitration device for sintering flue gas, wherein an emergency pure dry desulfurization system and an electrostatic dust collector are arranged in front of a semi-dry desulfurization system; the rear part of the electrostatic dust collector pure dry desulfurization system is connected with a main exhaust fan, and the rear part of the main exhaust fan is connected with a semi-dry desulfurization system.
The utility model discloses desulfurization dust removal and denitrification facility of sintering flue gas, the ash discharging device of semidry desulfurization system bottom and the defeated grey device of sack cleaner bottom all link to each other with concentrated ash storehouse.
The utility model discloses desulfurization dust removal and denitrification facility of sintering flue gas has following advantage:
the desulfurization, denitrification and dedusting rate of the desulfurization, dedusting and denitration device for sintering flue gas is high, and the ultralow emission standard of atmospheric pollutants is met; the utility model has simple structure, compact layout and small occupied area; the utility model discloses the desulfurization of sintering flue gas is removed dust and denitrification facility operation is implemented simply, and equipment fault rate is low to can move simultaneously with sintering main process system, promote work efficiency.
Drawings
FIG. 1 is the schematic structural diagram of the desulfurization, dust removal and denitration device of the sintering flue gas.
Fig. 2 is a schematic structural view of the semi-dry desulfurization system of fig. 1.
FIG. 3 is a schematic structural view of the bag-type dust collector in FIG. 1.
FIG. 4 is a schematic diagram of an off-line valve opening of the bag-type dust collector of FIG. 1.
FIG. 5 is a schematic diagram of the bag-type dust collector of FIG. 1 showing the expansion of the filter bag when the off-line valve is closed.
Fig. 6 is a schematic structural view of the denitration system of fig. 1.
In the figure: the system comprises a semi-dry desulfurization system 1, a liquid filling tank 1.1, a top tank 1.2, a rotary spraying device 1.3, an absorption tower 1.4, an ash discharge device 1.5, a dust gas outlet 1.6, a bag-type dust collector 2, a filter chamber 2.1, a filter bag 2.2, an air purifying chamber 2.3, an ash hopper 2.4, an off-line valve 2.5, an air inlet 2.6, a gas purifying outlet 2.7, an ash conveying device 2.8, a denitration system 3, a flue gas heat exchanger 3.1, a cold end 3.2, a hot end 3.3, a combustor 3.4, a reactor 3.5, a supercharger 4, a pure dry desulfurization system 5, an electrostatic dust collector 6, a main exhaust fan 7 and a concentrated ash bin 8.
Detailed Description
Referring to fig. 1 to 6, the utility model relates to a desulfurization, dust removal and denitration device for sintering flue gas, which comprises a semi-dry desulfurization system 1, a bag-type dust collector 2, a denitration system 3, and a pure dry desulfurization system 5 and an electrostatic dust collector 6 which are arranged in front of the semi-dry desulfurization system 1 and are emergency standby; the bag-type dust collector 2 is arranged behind the semi-dry desulfurization system 1, and the denitration system 3 is arranged behind the bag-type dust collector 2.
The rear part of the pure dry desulfurization system 5 is connected with an electrostatic dust collector 6, the rear part of the electrostatic dust collector 6 is connected with a main exhaust fan 7, and the rear part of the main exhaust fan 7 is connected with the semi-dry desulfurization system 1. The pure dry desulfurization system 5 operates only when the sulfur dioxide concentration exceeds the design value.
The semi-dry desulfurization system 1 comprises a liquid tank 1.1 for containing calcium hydroxide slurry and an absorption tower 1.4, wherein the absorption tower 1.4 adopts a rotary spray drying method (SDA); the liquid charging tank 1.1 is connected with a top tank 1.2 positioned above the absorption tower 1.4, and the top tank 1.2 is connected with the absorption tower; a rotary spraying device 1.3 is arranged in the absorption tower 1.4; a dust gas outlet 1.6 is formed in the side surface of the absorption tower 1.4; and an ash discharging device 1.5 is arranged at the bottom of the absorption tower 1.4.
The desulfurized flue gas from the semidry desulfurization system 1 needs to enter a subsequent bag-type dust collector 2 for dust removal because the flue gas contains solid desulfurization products, so as to ensure that the dust concentration at the outlet of the system is less than 10mg/m3。
The bag-type dust collector 2 comprises a plurality of filter chambers 2.1, and filter bags 2.2 are arranged in the filter chambers 2.1; the upper end of the filter chamber 2.1 is provided with a gas purifying chamber 2.3, and the end part of the gas purifying chamber 2.3 is provided with a gas purifying outlet 2.7; an ash hopper 2.4 is arranged at the lower end of the filtering chamber 2.1, an air inlet 2.6 is arranged on the side surface of the ash hopper 2.4, and an ash conveying device 2.8 is arranged at the bottom of the ash hopper 2.4. An off-line valve 2.5 is arranged in the bag-type dust collector 2. And a dust gas outlet 1.6 of the semi-dry desulfurization system 1 is connected with an air inlet 2.6 of the bag-type dust collector 2. And an ash discharge device 1.5 at the bottom of the semidry desulfurization system 1 and an ash conveying device 2.8 at the bottom of the bag-type dust collector 2 are connected with a concentrated ash bin 8.
The denitration system 3 comprises a flue gas heat exchanger 3.1, and the bag-type dust collector 2 is connected with a cold end 3.2 of the flue gas heat exchanger 3.1; the upper part of the cold end 3.2 of the flue gas heat exchanger 3.2 is connected with a burner 3.4 for heating flue gas, the burner 3.4 is connected with a denitration reactor 3.5, and the denitration reactor 3.5 adopts a Selective Catalytic Reduction (SCR) method; and the denitration reactor 3.5 is connected with a hot end 3.3 of the flue gas heat exchanger 3.2. The flue gas after desulfurization and bag-type dust removal enters a subsequent denitration system 3, and because the temperature of the flue gas discharged from the bag-type dust remover 2 cannot meet the temperature requirement of denitration, the flue gas needs to be subjected to temperature rise treatment in a mode of heating by a combustor 3.4; in order to reduce the fuel consumption of the combustor 3.4 heating system, the flue gas heat exchanger 3.1 is arranged at the inlet and the outlet of the denitration system 3, the heat of the high-temperature flue gas at the denitration outlet is recovered, and the heat is transferred to the low-temperature flue gas at the denitration inlet, so that the fuel consumption of the combustor 3.4 heating system can be greatly reduced.
And a supercharger 4 is connected below the hot end of the flue gas heat exchanger 3.1, and the supercharger 4 is used for overcoming the resistance of each system and ensuring the normal operation of the system.
The utility model relates to a desulfurization dust removal and denitrification facility's of sintering flue gas theory of operation is: the flue gas coming out of the main exhaust fan 7 is converged and then enters the semi-dry desulfurization system 1, the calcium hydroxide slurry flows into the top tank 1.2 from the liquid tank 1.1 and then flows into the absorption tower 1.4 from the top tank 1.2, the calcium hydroxide slurry is fully atomized into small fog drops through the rotary atomizing device 1.3 rotating at high speed, so that the calcium hydroxide is fully contacted and reacted with the flue gas, the calcium hydroxide is gradually evaporated in the reaction process, the final desulfurization product is in a solid dry powder shape, and the concentration of sulfur dioxide at an outlet is ensured to be less than 35mg/m3(ii) a The dust-containing flue gas from the semidry desulfurization system 1 enters a filter chamber 2.1 from an air inlet 2.3 at the side of an ash bucket 2.4, coarse particles directly fall into the ash bucket 2.4 and are discharged from an ash discharge device 2.8, the dust-containing gas is filtered by a filter bag 2.2, dust is retained on the surface of the filter bag 2.2, and the purified gas enters a gas purification chamber 2.3 through a bag opening of the filter bag 2.2 and is finally discharged from a purified gas outlet 2.7; along with the proceeding of the filtering working condition, the more the dust on the filter bag 2.2 is accumulated, the off-line valve 2.5 is closed, the dust removal work of the filter bag 2.2 is carried out, the filter bag 2.2 expands outwards, when the bag wall expands to the limit position, the strong tension makes the bag receive strong impact vibration and obtain the maximum reverse acceleration, so as to start to contract inwards, the dust layer attached to the surface of the filter bag 2.2 is not under the action of the tension, and the dust layer falls off from the filter bag 2.2 due to the action of the inertia force, settles into the dust hopper 2.4 and is discharged from the dust discharging device 2.8. After the interception and the trapping of the bag-type dust collector 2, the concentration of the particulate matters in the smoke at the outlet of the bag-type dust collector 2 is less than or equal to 5mg/m3(ii) a The flue gas which enters the denitration system 3 after being dedusted by the bag-type dust collector 2 passes through a flue gas heat exchanger 3.1 and a combustor 3.4, the temperature reaches about 280 ℃, a diluted reducing agent is sprayed into a flue before entering a denitration catalyst, then nitrogen oxide in the flue gas and the reducing agent undergo a selective catalytic reduction reaction under the action of the catalyst to generate nitrogen and water, and the concentration of the nitrogen oxide at a denitration outlet is ensured to be less than 50mg/m3。
Claims (3)
1. The utility model provides a desulfurization dust removal and denitrification facility of sintering flue gas which characterized in that: the device comprises a semi-dry desulfurization system (1), a bag-type dust remover (2) and a denitration system (3), wherein the bag-type dust remover (2) is arranged behind the semi-dry desulfurization system (1), and the denitration system (3) is arranged behind the bag-type dust remover (2);
the semi-dry desulfurization system (1) comprises a liquid loading tank (1.1) and an absorption tower (1.4), wherein the liquid loading tank (1.1) is connected with a top tank (1.2) positioned above the absorption tower (1.4), and the top tank (1.2) is connected with the absorption tower; a rotary spraying device (1.3) is arranged in the absorption tower (1.4); a dust gas outlet (1.6) is formed in the side surface of the absorption tower (1.4); an ash discharging device (1.5) is arranged at the bottom of the absorption tower (1.4);
the bag-type dust collector (2) comprises a plurality of filter chambers (2.1), and filter bags (2.2) are arranged in the filter chambers (2.1); the upper end of the filter chamber (2.1) is provided with a gas purifying chamber (2.3), and the end part of the gas purifying chamber (2.3) is provided with a gas purifying outlet (2.7); an ash hopper (2.4) is arranged at the lower end of the filtering chamber (2.1), an air inlet (2.6) is arranged on the side surface of the ash hopper (2.4), and an ash conveying device (2.8) is arranged at the bottom of the ash hopper (2.4); an off-line valve (2.5) is arranged in the bag-type dust collector (2); a dust gas outlet (1.6) of the semi-dry desulfurization system (1) is connected with an air inlet (2.6) of the bag-type dust remover (2);
the denitration system (3) comprises a flue gas heat exchanger (3.1), and the bag-type dust collector (2) is connected with the cold end (3.2) of the flue gas heat exchanger (3.1); the upper part of the cold end (3.2) of the flue gas heat exchanger (3.2) is connected with a combustor (3.4), the combustor (3.4) is connected with a denitration reactor (3.5), and the denitration reactor (3.5) is connected with the hot end (3.3) of the flue gas heat exchanger (3.2); and a supercharger (4) is connected below the hot end of the flue gas heat exchanger (3.1).
2. The desulfurization, dust removal and denitration device for sintering flue gas as claimed in claim 1, wherein: an emergency pure dry desulphurization system (5) and an electrostatic dust collector (6) are arranged in front of the semidry desulphurization system (1); the device comprises an electrostatic dust collector (6), a main exhaust fan (7) and a semi-dry desulfurization system (1), wherein the pure dry desulfurization system (5) is arranged behind the electrostatic dust collector (6), the main exhaust fan (7) is connected behind the electrostatic dust collector (6), and the semi-dry desulfurization system (1) is connected behind the main exhaust fan (7).
3. The desulfurization, dust removal and denitration device for sintering flue gas as claimed in claim 1, wherein: and the ash discharging device (1.5) at the bottom of the semidry desulfurization system (1) and the ash conveying device (2.8) at the bottom of the bag-type dust remover (2) are connected with the concentrated ash bin (8).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921449987.XU CN211435748U (en) | 2019-09-02 | 2019-09-02 | Desulfurization, dust removal and denitration device for sintering flue gas |
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| CN201921449987.XU CN211435748U (en) | 2019-09-02 | 2019-09-02 | Desulfurization, dust removal and denitration device for sintering flue gas |
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| CN211435748U true CN211435748U (en) | 2020-09-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114058775A (en) * | 2021-11-18 | 2022-02-18 | 无锡翔龙环球科技股份有限公司 | Multi-section expansion flue of waste heat boiler |
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2019
- 2019-09-02 CN CN201921449987.XU patent/CN211435748U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114058775A (en) * | 2021-11-18 | 2022-02-18 | 无锡翔龙环球科技股份有限公司 | Multi-section expansion flue of waste heat boiler |
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