CN215842437U - Sintering flue gas desulfurization and denitrification treatment system - Google Patents
Sintering flue gas desulfurization and denitrification treatment system Download PDFInfo
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- CN215842437U CN215842437U CN202021847331.6U CN202021847331U CN215842437U CN 215842437 U CN215842437 U CN 215842437U CN 202021847331 U CN202021847331 U CN 202021847331U CN 215842437 U CN215842437 U CN 215842437U
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Abstract
The utility model discloses a sintering flue gas desulfurization and denitrification treatment system, which comprises: the device comprises an electrostatic dust collector, a main induced draft fan, a desulfurization and dust removal device, a low-temperature denitration device, a desulfurization and denitration induced draft fan and an exhaust chimney; the electrostatic dust collector is used for receiving the sintering flue gas and performing dust removal and purification to obtain high-concentration sulfur dioxide sintering flue gas; the main induced draft fan is used for introducing the high-concentration sulfur dioxide sintering flue gas into the desulfurization and dust removal device; the desulfurization and dust removal device is used for performing desulfurization and dust removal treatment on the high-concentration sulfur dioxide sintering flue gas to obtain desulfurization and dust removal flue gas and smoke dust; the low-temperature denitration device is used for carrying out denitration treatment on the desulfurization and dedusting flue gas to obtain desulfurization and denitration flue gas and water; and the desulfurization and denitrification draught fan is used for introducing the desulfurization and denitrification flue gas into the external discharge chimney. The desulfurization and denitrification processing system realizes the synergistic purification processing of desulfurization and denitrification of the sintering flue gas containing high-concentration sulfur dioxide, and improves the purification efficiency of the sintering flue gas.
Description
Technical Field
The utility model relates to the technical field of chemical industry and environmental protection, in particular to a sintering flue gas desulfurization and denitrification treatment system.
Background
At present, sintering flue gas is a main source of atmospheric pollutant emission of iron and steel enterprises and mainly comprises various pollutants such as particulate matters, sulfur dioxide and nitrogen oxides, wherein the sulfur dioxide and the nitrogen oxides are important precursors formed by main haze components PM 2.5. With the continuous tightening of the environmental protection policy standards of the steel industry and the implementation of the national environmental protection tax law, the emission concentration of various atmospheric pollutants such as particulate matters, sulfur dioxide, nitrogen oxides and the like of enterprises is required to reach special emission limits and even ultra-low emission standards, the environmental protection tax law is taken as the national top 'green tax law', starting from tax lever, the enterprises are also forced to reduce the total emission amount of pollutants, and the treatment of sintering flue gas is finally discharged after terminal treatment. The sintering machine head flue gas purification system built in the early stage mainly performs desulfurization and dust removal, has no denitration function, has many faults of the original desulfurization facility and low desulfurization efficiency, and has poor adaptability to high-sulfur raw materials for sintering and higher maintenance cost. And the existing desulfurization and denitrification treatment system can not effectively cooperate with the purification treatment of high-concentration sulfur dioxide, nitrogen oxide and particulate matters in the sintering flue gas.
To the above-mentioned problem, need urgently utility model one kind can effectively cooperate the high concentration sulfur dioxide of purification treatment sintering flue gas, nitrogen oxide and particulate matter, reduce final atmospheric pollutants and discharge the total amount, stably reach the device that the ultralow emission standard of steel industry required.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a desulfurization and denitrification treatment system for sintering flue gas, which realizes the synergistic purification treatment of desulfurization and denitrification of the sintering flue gas containing high-concentration sulfur dioxide, improves the purification efficiency of the sintering flue gas, can stably meet the requirement of ultralow emission standard of atmospheric pollutants in the steel industry, reduces the emission of the sintering flue gas pollutants in the steel plant, reduces the payment amount of environmental protection taxes in the sintering process, improves the competitiveness of green high-quality development of the steel plant in the industry, and effectively protects the quality of the atmospheric environment.
In order to achieve the above object, the present invention provides a sintering flue gas desulfurization and denitrification treatment system, which comprises:
the device comprises an electrostatic dust collector, a main induced draft fan, a desulfurization and dust removal device, a low-temperature denitration device, a desulfurization and denitration induced draft fan and an exhaust chimney;
the electrostatic dust collector is used for receiving the sintering flue gas and performing dust removal and purification to obtain high-concentration sulfur dioxide sintering flue gas;
the main induced draft fan is communicated with an outlet of the electrostatic dust collector and is used for introducing the high-concentration sulfur dioxide sintering flue gas into the desulfurization dust removal device;
the desulfurization and dust removal device is used for performing desulfurization and dust removal treatment on the high-concentration sulfur dioxide sintering flue gas to obtain desulfurization and dust removal flue gas and smoke dust;
The low-temperature denitration device is communicated with the desulfurization and dust removal device and is used for carrying out denitration treatment on the desulfurization and dust removal flue gas to obtain desulfurization and denitration flue gas and water;
the desulfurization and denitrification draught fan is used for introducing the desulfurization and denitrification flue gas into the external discharge chimney;
and the outer discharge chimney is communicated with the desulfurization and denitrification draught fan and is used for receiving the desulfurization and denitrification flue gas and discharging the flue gas into the atmosphere.
Further, the desulfurization and dust removal device comprises a desulfurization tower, a dust remover and a byproduct discharge device;
the desulfurizing tower is used for desulfurizing the high-concentration sulfur dioxide sintering flue gas to obtain desulfurized flue gas and first smoke dust;
the dust remover is communicated with the desulfurizing tower and is used for removing dust from the desulfurized flue gas to obtain desulfurized and dedusted flue gas, desulfurized ash and second smoke dust;
and the byproduct discharging device is used for receiving the first smoke dust and the second smoke dust.
Further, the desulfurization dust collector still includes material recovery unit, material recovery unit is used for returning the desulfurization ash to the desulfurizing tower carries out cyclic utilization.
Further, the desulfurization dust collector still includes material recovery unit, material recovery unit is used for returning the desulfurization ash to the desulfurizing tower carries out cyclic utilization.
Further, the low-temperature denitration device comprises: a heat exchanger, a heating furnace and a denitration reactor,
the heat exchanger is used for heating the desulfurization and dust removal flue gas through heat exchange to obtain preheated desulfurization and dust removal flue gas;
the heating furnace is used for carrying out second heating on the preheated desulfurization and dust removal flue gas to obtain heated desulfurization and dust removal flue gas;
and the denitration reactor is communicated with the heating furnace and used for reducing the heated desulfurization and dedusting flue gas to obtain the desulfurization and denitration flue gas.
Further, the denitration reactor is provided with a catalyst and a reducing agent, and the catalyst and the reducing agent reduce nitrogen oxides in the desulfurization and dedusting flue gas to generate harmless nitrogen and water.
Furthermore, the medium used by the heating furnace is mixed gas of blast furnace gas and coke oven gas, and is used for heating desulfurization and dust removal flue gas.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
according to the desulfurization and denitrification treatment system for the sintering flue gas, provided by the utility model, the sintering flue gas is subjected to desulfurization treatment sequentially through the electrostatic dust collector, the main induced draft fan and the desulfurization and dedusting device to obtain the desulfurization and dedusting flue gas, then the desulfurization and dedusting flue gas continuously enters the low-temperature denitrification device for denitrification, the sintering flue gas is finally purified to generate harmless nitrogen and water, and the clean sintering flue gas is discharged to a chimney through the system induced draft fan, so that the desulfurization, denitrification and purification integrated treatment of the sintering flue gas containing high-concentration sulfur dioxide is realized, and the pollutant emission of the sintering flue gas is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a sintering flue gas desulfurization and denitrification treatment system provided in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of a flow of sintering flue gas when the desulfurization and denitrification treatment system for sintering flue gas provided by embodiment 1 of the utility model is used; wherein, the figure (A) is a general flow chart when the sintering flue gas desulfurization and denitrification treatment system is used; (B) is a flow chart when the desulfurization and dust removal device is used; (C) the figure is a flow chart of the use of the low-temperature denitration device;
FIG. 3 is a schematic structural diagram of a sintering flue gas desulfurization and denitrification treatment system provided in embodiment 2 of the present invention;
1. an electrostatic precipitator; 2. a main induced draft fan; 3. a desulfurization dust-removing device; 31. a desulfurizing tower; 32. a dust remover; 33. a byproduct discharging device; 34. a material recovery device; 4. a low temperature denitrification facility; 41. a heat exchanger; 42. heating furnace; 43. a denitration reactor; 5. a desulfurization and denitrification draught fan; 6. and (4) discharging the smoke out of a chimney.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the utility model and are not to be construed as limiting the utility model.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by an existing system. The terms "first", "second", etc. do not denote any order, but rather are used to distinguish one element from another.
In order to solve the technical problems, the embodiment of the utility model provides the following general ideas:
the embodiment of the utility model provides a sintering flue gas desulfurization and denitrification treatment system, as shown in fig. 1, comprising:
The device comprises an electrostatic dust collector 1, a main induced draft fan 2, a desulfurization and dust removal device 3, a low-temperature denitration device 4, a desulfurization and denitration induced draft fan 5 and an exhaust chimney 6;
the electrostatic dust collector 1 is used for receiving the sintering flue gas and performing dust removal and purification to obtain high-concentration sulfur dioxide sintering flue gas;
the main induced draft fan 2 is communicated with an outlet of the electrostatic dust collector 1 and is used for introducing the high-concentration sulfur dioxide sintering flue gas into the desulfurization and dust removal device 3;
the desulfurization and dust removal device 3 is used for performing desulfurization and dust removal treatment on the high-concentration sulfur dioxide sintering flue gas to obtain desulfurization and dust removal flue gas and smoke dust;
the low-temperature denitration device 4 is communicated with the desulfurization and dust removal device and is used for carrying out denitration treatment on the desulfurization and dust removal flue gas to obtain desulfurization and denitration flue gas and water;
the desulfurization and denitrification draught fan 5 is used for introducing the desulfurization and denitrification flue gas into the external discharge chimney 6;
and the external discharge chimney 6 is communicated with the desulfurization and denitrification draught fan 5 and is used for receiving the desulfurization and denitrification flue gas and discharging the flue gas into the atmosphere.
According to the method, the sintering flue gas is subjected to desulfurization treatment sequentially through the electrostatic dust collector 1, the main induced draft fan 2 and the desulfurization and dust removal device 3 to obtain desulfurization and dust removal flue gas, then the desulfurization and dust removal flue gas continuously enters the low-temperature denitration device 4 to be denitrated to obtain desulfurization and denitration flue gas and water, the desulfurization and denitration flue gas is clean sintering flue gas and is introduced through the desulfurization and denitration induced draft fan 5, the exhaust chimney 6 is discharged into the atmosphere, the sintering flue gas is finally purified, harmless nitrogen and water are generated, the desulfurization, denitration and purification integrated treatment of the sintering flue gas containing high-concentration sulfur dioxide is realized, and the emission amount of pollutants in the sintering flue gas is reduced.
Preferably, the desulfurization and dust removal device 3 comprises a desulfurization tower 31, a dust remover 32 and a byproduct discharge device 33;
the desulfurizing tower 31 is configured to desulfurize the high-concentration sulfur dioxide sintering flue gas to obtain a desulfurized flue gas;
the oxidation reaction of the sintering flue gas in the desulfurizing tower 31 is as follows:
SO2+NaClO+H2O→Na2SO4+NaCl+HClO；
NO+NaClO+H2O→NO2+HCl+NaCl；
the dust remover 32 is communicated with the desulfurizing tower 31 and is used for removing dust from the desulfurized flue gas to obtain desulfurized and dedusted flue gas, desulfurized ash and smoke dust;
and the byproduct discharging device 33 is used for receiving the smoke.
The desulfurizing tower 31 receives the high-concentration sulfur dioxide sintering flue gas passing through the electrostatic dust collector 1, and carries out desulfurization treatment to obtain desulfurized flue gas and first smoke dust; the dust remover 32 receives the desulfurization tower 31 to perform dust removal purification again to obtain desulfurization dust-removal flue gas, desulfurization ash and second smoke dust; the byproduct discharging device 33 is used for receiving the first smoke and the second smoke, and collecting, processing and utilizing the first smoke and the second smoke. The temperature of the desulfurization and dust removal flue gas reaches the standard of entering the low-temperature denitration device 4.
Preferably, the desulfurization dust removal device 3 further comprises a material recovery device 34, and the material recovery device 34 is used for returning the desulfurization ash to the desulfurization tower for recycling. Specifically, the material recovery device is a communicating pipe, one end of the communicating pipe is communicated with an outlet of the dust remover, and the other end of the communicating pipe is communicated with an inlet of the desulfurizing tower.
The material recovery device 34 can return the desulfurization ash collected by the pulse bag type dust collector to the desulfurization tower for cyclic utilization, prolong the retention time of absorbent particles in the tower, improve the utilization rate of the absorbent, reduce the operation cost, and meet the requirements of absorption and reaction of the desulfurization tower.
Preferably, the dust remover is a pulse bag type dust remover. The pulse bag type dust collector adopts a compartment air-stopping pulse blowing dust-cleaning technology, overcomes the defects of the conventional pulse dust collector and a compartment back-blowing dust collector, and has the advantages of strong dust-cleaning capacity, high dust-cleaning efficiency, low emission concentration, small air leakage rate, less energy consumption, less steel consumption, less floor area, stable and reliable operation and good economic benefit. Because the chamber-divided air-stopping pulse blowing is adopted for deashing, the aim of thorough deashing can be achieved by blowing once, so that the deashing period is prolonged, the deashing energy consumption is reduced, and the air pressure consumption can be greatly reduced.
Preferably, the low-temperature denitration apparatus 4 includes: a heat exchanger 41, a heating furnace 42 and a denitration reactor 43,
the heat exchanger 41 is used for heating the desulfurization and dedusting flue gas through heat exchange to obtain preheated desulfurization and dedusting flue gas;
the heating furnace 42 is configured to perform second heating on the preheated desulfurization and dedusting flue gas to obtain heated desulfurization and dedusting flue gas;
And the denitration reactor 43 is communicated with the heating furnace 42 and is used for reducing the heated desulfurization and dedusting flue gas to obtain the desulfurization and denitration flue gas.
Preferably, the desulfurized and dedusted flue gas is subjected to heat exchange by the heat exchanger 41 to obtain preheated desulfurized and dedusted flue gas, and the preheating temperature is 220-240 ℃; then mixed gas of blast furnace gas and coke oven gas passing through the heating furnace 42 is used as a heating source, so that the temperature of the flue gas reaches the optimum denitration temperature, specifically 260-280 ℃; under the action of a catalyst, when the temperature of the flue gas is about 260-280 ℃, the denitration reactor 43 takes ammonia as a reducing agent to react with nitrogen oxides in the flue gas to generate harmless nitrogen and water.
The nitrogen oxides in the denitration reactor 43 react as follows:
NO2+H2O→HNO2+HNO3；
HNO2+HNO3+(NH2)2CO→N2+CO2+H2O；
the following will explain a sintering flue gas desulfurization and denitration treatment system of the present application in detail with reference to examples, comparative examples and experimental data.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a system for desulfurization and denitrification of sintering flue gas, including: the device comprises an electrostatic dust collector 1, a main induced draft fan 2, a desulfurization and dust removal device 3, a low-temperature denitration device 4, a desulfurization and denitration induced draft fan 5 and an exhaust chimney 6;
The electrostatic dust collector 1 is used for receiving the sintering flue gas and performing dust removal and purification to obtain high-concentration sulfur dioxide sintering flue gas;
the main induced draft fan 2 is communicated with an outlet of the electrostatic dust collector and is used for introducing the high-concentration sulfur dioxide sintering flue gas into the desulfurization dust removal device;
the desulfurization and dust removal device 3 is used for performing desulfurization and dust removal treatment on the high-concentration sulfur dioxide sintering flue gas to obtain desulfurization and dust removal flue gas and smoke dust; the desulfurization and dust removal device 3 comprises a desulfurization tower 31, a dust remover 32 and a byproduct discharge device 33;
the desulfurizing tower 31 is configured to desulfurize the high-concentration sulfur dioxide sintering flue gas to obtain a desulfurized flue gas;
the dust remover 32 is communicated with the desulfurizing tower 31 and is used for removing dust from the desulfurized flue gas to obtain desulfurized and dedusted flue gas, desulfurized ash and smoke dust;
and the byproduct discharging device 33 is used for receiving the smoke.
The low-temperature denitration device 4 is communicated with the desulfurization and dust removal device and is used for carrying out denitration treatment on the desulfurization and dust removal flue gas to obtain desulfurization and denitration flue gas and water;
the low-temperature denitration device 4 includes: a heat exchanger 41, a heating furnace 42 and a denitration reactor 43,
The heat exchanger 41 is used for heating the desulfurization and dedusting flue gas through heat exchange to obtain preheated desulfurization and dedusting flue gas;
the heating furnace 42 is used for carrying out second heating on the preheated desulfurization and dedusting flue gas, and heating the desulfurization and dedusting flue gas;
and the denitration reactor 43 is communicated with the heat exchanger and is used for reducing the heated desulfurization and dedusting flue gas to obtain the desulfurization and denitration flue gas.
The desulfurization and denitrification draught fan 5 is used for introducing the desulfurization and denitrification flue gas into the external discharge chimney;
and the external discharge chimney 6 is communicated with the desulfurization and denitrification induced draft fan and is used for receiving the desulfurization and denitrification flue gas and discharging the flue gas into the atmosphere.
Secondly, as shown in fig. 2, the working process of the sintering flue gas desulfurization and denitrification treatment system is as follows:
s1, the sintering flue gas sequentially passes through the electrostatic dust collector 1 and the main induced draft fan 2 and enters the desulfurizing tower 31;
s2, the desulfurizing tower 31 receives the high-concentration sulfur dioxide sintering flue gas passing through the electrostatic dust collector 1, and desulfurization treatment is carried out to obtain desulfurized flue gas and first smoke dust; the dust remover 32 receives the desulfurization tower 31 to perform dust removal purification again to obtain desulfurization dust-removal flue gas, desulfurization ash and second smoke dust; the byproduct discharging device 33 is used for receiving the first smoke and the second smoke, and collecting, processing and utilizing the first smoke and the second smoke. The temperature of the desulfurization and dust removal flue gas reaches the standard of entering the low-temperature denitration device 4.
S3, enabling the desulfurization and dust removal flue gas to enter a heat exchanger 41, and enabling the desulfurization and dust removal flue gas to be subjected to heat exchange through the heat exchanger 41 to obtain preheated desulfurization and dust removal flue gas, wherein the preheating temperature is 220-240 ℃; then mixed gas of blast furnace gas and coke oven gas passing through the heating furnace 42 is used as a heating source, so that the temperature of the flue gas reaches the optimum denitration temperature, specifically 260-280 ℃; under the action of the catalyst, when the temperature of the flue gas is 260-280 ℃, the denitration reactor 43 takes ammonia as a reducing agent to react with nitrogen oxides in the flue gas to generate harmless nitrogen and water.
S4, the desulfurization and denitration flue gas is clean sintering flue gas, is introduced into the exhaust chimney 6 through the desulfurization and denitration draught fan 5 and is exhausted into the atmosphere, the sintering flue gas is finally purified, harmless nitrogen and water are generated, the desulfurization, denitration and purification integrated treatment of the sintering flue gas containing high-concentration sulfur dioxide is realized, and the pollutant emission amount of the sintering flue gas is reduced.
The embodiment is a sintering plant desulfurization system for a No. 1#360 square meter, and the flue gas quantity is 1400000Nm3/h，SO2Concentration: 1200mg/m3， NOXConcentration: 300mg/m3(mainly NO, accounting for 95%) and the system of the embodiment is adopted for combined desulfurization and denitrification. Flue gas SO discharged after treatment2The concentration is about 45mg/m 3，NOXThe lowest concentration is 96g/m3. The desulfurization efficiency is 96.8 percent, and the denitration efficiency is up to 68 percent at most; the desulfurization and denitrification efficiency is high. The emission concentration of smoke dust is not more than 10mg/Nm3。
Example 2
As shown in fig. 3, an embodiment of the present invention provides a system for desulfurization and denitrification of sintering flue gas, including: the device comprises an electrostatic dust collector 1, a main induced draft fan 2, a desulfurization and dust removal device 3, a low-temperature denitration device 4, a desulfurization and denitration induced draft fan 5 and an exhaust chimney 6;
the electrostatic dust collector 1 is used for receiving the sintering flue gas and performing dust removal and purification to obtain high-concentration sulfur dioxide sintering flue gas;
the main induced draft fan 2 is communicated with an outlet of the electrostatic dust collector and is used for introducing the high-concentration sulfur dioxide sintering flue gas into the desulfurization dust removal device;
the desulfurization and dust removal device 3 is used for performing desulfurization and dust removal treatment on the high-concentration sulfur dioxide sintering flue gas to obtain desulfurization and dust removal flue gas and smoke dust; the desulfurization and dust removal device 3 comprises a desulfurization tower 31, a dust remover 32, a byproduct discharging device 33 and a material recovery device 34;
the desulfurizing tower 31 is configured to desulfurize the high-concentration sulfur dioxide sintering flue gas to obtain a desulfurized flue gas;
the dust remover 32 is communicated with the desulfurizing tower 31 and is used for removing dust from the desulfurized flue gas to obtain desulfurized and dedusted flue gas, desulfurized ash and smoke dust;
The byproduct discharging device 33 is used for receiving the smoke;
the material recovery device 34 is a communicating pipe, one end of the communicating pipe is communicated with the outlet of the dust remover, and the other end of the communicating pipe is communicated with the inlet of the desulfurizing tower.
The low-temperature denitration device 4 is communicated with the desulfurization and dust removal device and is used for carrying out denitration treatment on the desulfurization and dust removal flue gas to obtain desulfurization and denitration flue gas and water;
the low-temperature denitration device 4 includes: a heat exchanger 41, a heating furnace 42 and a denitration reactor 43,
the heat exchanger 41 is used for heating the desulfurization and dedusting flue gas through heat exchange to obtain preheated desulfurization and dedusting flue gas;
the heating furnace 42 is used for carrying out second heating on the preheated desulfurization and dedusting flue gas, and heating the desulfurization and dedusting flue gas;
and the denitration reactor 43 is communicated with the heat exchanger and is used for reducing the heated desulfurization and dedusting flue gas to obtain the desulfurization and denitration flue gas.
The desulfurization and denitrification draught fan 5 is used for introducing the desulfurization and denitrification flue gas into the external discharge chimney;
and the external discharge chimney 6 is communicated with the desulfurization and denitrification induced draft fan and is used for receiving the desulfurization and denitrification flue gas and discharging the flue gas into the atmosphere.
Secondly, the working process of the sintering flue gas desulfurization and denitrification treatment system is as follows:
S1, the sintering flue gas sequentially passes through the electrostatic dust collector 1 and the main induced draft fan 2 and enters the desulfurizing tower 31;
s2, the desulfurizing tower 31 receives the high-concentration sulfur dioxide sintering flue gas passing through the electrostatic dust collector 1, and desulfurization treatment is carried out to obtain desulfurized flue gas and first smoke dust; the dust remover 32 receives the desulfurization tower 31 to perform dust removal purification again to obtain desulfurization dust-removal flue gas, desulfurization ash and second smoke dust; the byproduct discharging device 33 is used for receiving the first smoke and the second smoke, and collecting, processing and utilizing the first smoke and the second smoke. The temperature of the desulfurization and dust removal flue gas reaches the standard of entering a low-temperature denitration device 4; the material recovery device 34 can return the desulfurized fly ash collected by the dust collector to the desulfurizing tower 31 for cyclic utilization, prolong the retention time of absorbent particles in the tower, improve the utilization rate of the absorbent, reduce the operating cost, and meet the requirements of absorption and reaction of the desulfurizing tower.
S3, enabling the desulfurized and dedusted flue gas to enter a heat exchanger 41, and exchanging heat to obtain preheated desulfurized and dedusted flue gas, wherein the preheating temperature is 220-240 ℃; then mixed gas of blast furnace gas and coke oven gas passing through the heating furnace 42 is used as a heating source, so that the temperature of the flue gas reaches the optimum denitration temperature, specifically 260-280 ℃; under the action of the catalyst, when the temperature of the flue gas is 260-280 ℃, the denitration reactor 43 takes ammonia as a reducing agent to react with nitrogen oxides in the flue gas to generate harmless nitrogen and water.
S4, the desulfurization and denitration flue gas is clean sintering flue gas, is introduced into the exhaust chimney 6 through the desulfurization and denitration draught fan 5 and is exhausted into the atmosphere, the sintering flue gas is finally purified, harmless nitrogen and water are generated, the desulfurization, denitration and purification integrated treatment of the sintering flue gas containing high-concentration sulfur dioxide is realized, and the pollutant emission amount of the sintering flue gas is reduced.
The embodiment is a sintering plant desulfurization system for a No. 1#360 square meter, and the flue gas quantity is 1400000Nm3/h，SO2Concentration: 1200mg/m3， NOXConcentration: 300mg/m3(mainly NO, accounting for 95%) and the system of the embodiment is adopted for combined desulfurization and denitrification. Flue gas SO discharged after treatment2The concentration is about 38mg/m3，NOXThe lowest concentration is 85mg/m3. The desulfurization efficiency is 96.8 percent, and the denitration efficiency is up to 71.7 percent at most; the desulfurization and denitrification efficiency is high. The emission concentration of smoke dust is not more than 5mg/Nm3。
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, system, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, system, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The utility model provides a sintering flue gas desulfurization denitration treatment system which characterized in that includes: the device comprises an electrostatic dust collector, a main induced draft fan, a desulfurization and dust removal device, a low-temperature denitration device, a desulfurization and denitration induced draft fan and an exhaust chimney;
the electrostatic dust collector is used for receiving the sintering flue gas and performing dust removal and purification to obtain high-concentration sulfur dioxide sintering flue gas;
the main induced draft fan is communicated with an outlet of the electrostatic dust collector and is used for introducing the high-concentration sulfur dioxide sintering flue gas into the desulfurization dust removal device;
The desulfurization and dust removal device is used for performing desulfurization and dust removal treatment on the high-concentration sulfur dioxide sintering flue gas to obtain desulfurization and dust removal flue gas and smoke dust;
the low-temperature denitration device is communicated with the desulfurization and dust removal device and is used for carrying out denitration treatment on the desulfurization and dust removal flue gas to obtain desulfurization and denitration flue gas and water;
the desulfurization and denitrification draught fan is used for introducing the desulfurization and denitrification flue gas into the external discharge chimney;
and the outer discharge chimney is communicated with the desulfurization and denitrification draught fan and is used for receiving the desulfurization and denitrification flue gas and discharging the flue gas into the atmosphere.
2. The desulfurization and denitrification treatment system for the sintering flue gas as recited in claim 1, wherein the desulfurization and dust removal device comprises a desulfurization tower, a dust remover and a byproduct discharge device;
the desulfurizing tower is used for desulfurizing the high-concentration sulfur dioxide sintering flue gas to obtain desulfurized flue gas and first smoke dust;
the dust remover is communicated with the desulfurizing tower and is used for removing dust from the desulfurized flue gas to obtain desulfurized and dedusted flue gas, desulfurized ash and second smoke dust;
and the byproduct discharging device is used for receiving the first smoke dust and the second smoke dust.
3. The desulfurization and denitrification treatment system for sintering flue gas as recited in claim 2, wherein the desulfurization and dust removal device further comprises a material recovery device, and the material recovery device is used for returning the desulfurization ash to the desulfurization tower for recycling.
4. The desulfurization and denitrification treatment system for sintering flue gas as claimed in claim 3, wherein the material recovery device is a communicating pipe, one end of the communicating pipe is communicated with the outlet of the dust remover, and the other end of the communicating pipe is communicated with the inlet of the desulfurization tower.
5. The desulfurization and denitrification treatment system for sintering flue gas as recited in claim 2, wherein the dust collector is a pulse bag type dust collector.
6. The desulfurization and denitrification treatment system for sintering flue gas as claimed in claim 1, wherein the low-temperature denitrification device comprises: a heat exchanger, a heating furnace and a denitration reactor,
the heat exchanger is used for heating the desulfurization and dust removal flue gas through heat exchange to obtain preheated desulfurization and dust removal flue gas;
the heating furnace is used for carrying out second heating on the preheated desulfurization and dust removal flue gas to obtain heated desulfurization and dust removal flue gas;
and the denitration reactor is communicated with the heating furnace and used for reducing the heated desulfurization and dedusting flue gas to obtain the desulfurization and denitration flue gas.
7. The desulfurization and denitrification treatment system for the sintering flue gas as claimed in claim 6, wherein the denitrification reactor is provided with a catalyst and a reducing agent, and the catalyst and the reducing agent react and reduce nitrogen oxides in the desulfurization and dedusting flue gas to generate harmless nitrogen and water.
8. The desulfurization and denitrification treatment system for sintering flue gas as claimed in claim 6, wherein the medium used by the heating furnace is mixed gas of combustion blast furnace gas and coke oven gas, and is used for heating desulfurization and dedusting flue gas.
9. The desulfurization and denitrification treatment system for sintering flue gas as recited in claim 6, wherein the heat exchanger is a steam heat exchanger or a plate heat exchanger.
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| CN117258498A (en) * | 2023-10-30 | 2023-12-22 | 河北中科朗博环保科技有限公司 | Bypass flue system for corrosion prevention of flue gas purification facility of sintering machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117258498A (en) * | 2023-10-30 | 2023-12-22 | 河北中科朗博环保科技有限公司 | Bypass flue system for corrosion prevention of flue gas purification facility of sintering machine |
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