CN212440685U - Purification system for tail flue gas of cement kiln - Google Patents
Purification system for tail flue gas of cement kiln Download PDFInfo
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- CN212440685U CN212440685U CN202020163678.2U CN202020163678U CN212440685U CN 212440685 U CN212440685 U CN 212440685U CN 202020163678 U CN202020163678 U CN 202020163678U CN 212440685 U CN212440685 U CN 212440685U
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Abstract
The utility model discloses a clean system of cement kiln tail flue gas, include: the device comprises a denitration device, a cooling device communicated with an outlet of the denitration device, a fluidized bed desulfurization device communicated with an outlet of the cooling device, a desulfurizer bin for providing desulfurizer for the fluidized bed desulfurization device, an injection device for injecting water to the fluidized bed desulfurization device, and a first dust remover communicated with the outlet of the fluidized bed desulfurization device. The purification system carries out denitration on the flue gas through the denitration device, and removes acid gases, heavy metals and organic pollutants in the flue gas through the fluidized bed desulphurization device; removing dust through a first dust remover; the fluidized bed desulfurization device has double purification capacity of high-efficiency absorption and adsorption, and realizes the high-efficiency removal of multi-component pollutants; most fine particles are humidified and condensed into flocculent large particles, so that the particle size of outlet particles is improved, and the dust removal effect of a subsequent first dust remover is improved. The purification system is convenient for cooperatively removing multi-component pollutants while meeting the requirement of ultralow emission.
Description
Technical Field
The utility model relates to a flue gas treatment technical field, more specifically say, relate to a clean system of cement kiln tail flue gas.
Background
The cement kiln is a main source for discharging smoke pollutants in the cement industry, and combustion of pulverized coal and calcination of clinker in the cement kiln can generate a large amount of smoke accompanied with discharge of pollutants such as dust particles, sulfides, nitrogen oxides, fluorides, heavy metals, organic pollutants and the like. At present, the tail flue gas of the cement kiln needs to be purified to meet the emission requirement.
At present, NOx and SO are produced on cement kiln production line2Harmful gasThe research on single technology of ultralow emission of components is more, but the system solution and realization of ultralow emission are less, and the technology for purifying the tail flue gas multiple pollutants of the cement kiln is not popularized and applied on a large scale at present. The integrated technology for flue gas desulfurization and denitration simultaneously realizes desulfurization and denitration by using active carbon, ozone and the like in the same device, but has the defects of high operating cost of the adsorbent, poor equipment reliability and higher requirement on a reaction temperature window, and is difficult to meet the requirement of large-scale industrial use; the technology of industries such as steel, metallurgy, coking and the like is not suitable for the cement high-dust industry. .
In conclusion, how to efficiently purify the tail flue gas of the cement kiln so as to meet the requirement of ultralow emission and simultaneously remove multi-component pollutants in a synergistic manner is a problem to be solved by technical personnel in the field at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a clean system of cement kiln tail flue gas to when satisfying ultralow emission demand desorption multicomponent pollutant in coordination.
In order to achieve the above object, the present invention provides the following technical solutions:
a purification system for cement kiln tail gas comprises:
a denitration device, a denitration device and a denitration device,
a cooling device communicated with the outlet of the denitration device,
a fluidized bed desulfurization device communicated with the outlet of the cooling device,
a desulfurizer bin for providing desulfurizer to the fluidized bed desulfurizer,
a spraying device for spraying water to the fluidized bed desulfurization device,
and the first dust remover is communicated with the outlet of the fluidized bed desulfurization device.
Preferably, the purification system for the cement kiln tail flue gas further comprises a second dust remover, and the denitration device is communicated with a flue gas outlet of the second dust remover.
Preferably, the purification system for the cement kiln tail flue gas further comprises a circulating conveying device, and the circulating conveying device is communicated with the ash discharge port of the first dust remover and the fluidized bed desulfurization device;
wherein, the material of the powder cake layer on the filter bag in the first dust remover contains a desulfurizer.
Preferably, the purification system of cement kiln tail gas further comprises a regulating device, and the regulating device comprises: the device comprises an adjusting pipeline and an adjusting valve connected to the adjusting pipeline in series, wherein the adjusting pipeline is communicated with a flue gas outlet of the first dust remover and the fluidized bed desulfurization device.
Preferably, the desulfurizer bin is connected in series with a pipeline communicated with an inlet of the fluidized bed desulfurization device.
Preferably, the purification system for the cement kiln tail gas further comprises: and the third dust remover is connected between the cooling device and the fluidized bed desulfurization device in series.
Preferably, the purification system for the cement kiln tail gas further comprises: and the first fan is connected between the cooling device and the fluidized bed desulfurization device in series.
Preferably, the flue gas outlet of the first dust remover is communicated with a chimney through a discharge pipeline, and a second fan is connected on the discharge pipeline in series;
and the ash discharge port of the first dust remover is communicated with the raw material warehouse through a byproduct conveying device.
Preferably, the purification system for the cement kiln tail gas further comprises: the raw meal mill is connected between the cooling device and the fluidized bed desulfurization device in series, and the bypass pipeline is connected with the raw meal mill in parallel;
wherein, the bypass valve is connected in series on the bypass pipeline, two valves are connected in series on the pipeline connected in parallel with the bypass pipeline, and one valve, the raw meal mill and the other valve are connected in series in sequence.
Preferably, the second dust remover and the denitration device are of an integrated structure.
Preferably, the dust removal efficiency of the second dust remover is more than 80%;
the outlet temperature of the cooling device is 180-220 ℃;
outlet NO of the denitration apparatusxThe concentration is not more than 50mg/Nm3；
The inlet flue gas temperature of the fluidized bed desulfurization device is 100-220 ℃, the outlet flue gas temperature of the fluidized bed desulfurization device is 10-15 ℃ above the water dew point, the bed pressure of the fluidized bed desulfurization device is 800-1400 Pa, and the outlet SO of the fluidized bed desulfurization device2The concentration is not more than 35mg/Nm3；
The fluidized bed desulfurization device is a desulfurization tower, the flow velocity of the flue gas in a Venturi section of the desulfurization tower is 30-70 m/s, and the flow velocity of the flue gas in a straight pipe section of the desulfurization tower is 3-7 m/s;
the concentration of the smoke dust at the outlet of the first dust remover is not more than 5mg/Nm3。。
The utility model provides a purification system's of cement kiln tail flue gas purification principle: denitration is carried out on the flue gas through a denitration device, and the denitration flue gas is cooled through a cooling device; removing acidic gases such as sulfide, hydrogen chloride and fluoride in the flue gas through a fluidized bed desulfurization device, and adsorbing and removing heavy metals and organic pollutants; dust is removed by a first dust remover.
The utility model provides an among the clean system of cement kiln tail flue gas, provide the desulfurizer to fluidized bed desulphurization unit through the desulfurizer storehouse, spray water in to fluidized bed desulphurization unit through injection apparatus, then fluidized bed desulphurization unit's high density granule bed has huge surface area, huge adsorption mechanism has been formed under the effect of fiercely turbulent air current, combine the absorption reaction mechanism of the high-efficient mass transfer heat transfer of fluidized bed, make fluidized bed desulphurization unit have high-efficient absorption and absorbent dual purification ability, thereby realize the high-efficient desorption to sulphide, hydrogen chloride, acid gases such as fluoride, and heavy metal and organic pollutant; and, combine injection apparatus to the interior injection water of fluidized bed desulphurization unit, the most tiny particulate matters of fluidized bed desulphurization unit can the humidification coagulation and become flocculent large granule, has improved fluidized bed desulphurization unit's export granule particle diameter to the dust removal effect of follow-up first dust remover has been improved. Therefore, the purification system for the cement kiln tail gas meets the requirement of ultralow emission and can remove the multi-component pollutants synergistically.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a system for purifying cement kiln tail gas provided by the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in FIG. 1, the embodiment of the present invention provides a purification system for cement kiln tail gas, including: a denitration device 5, a cooling device 6, a fluidized bed desulfurization device 9, a desulfurizer bin 18, an injection device, and a first dust remover 10.
Wherein, the outlet intercommunication of heat sink 6 and denitrification facility 5, the export intercommunication of fluidized bed desulphurization unit 9 and heat sink 6, desulfurizer storehouse 18 provides the desulfurizer to fluidized bed desulphurization unit 9, and injection apparatus sprays water to fluidized bed desulphurization unit 9, and first dust remover 10 communicates with the outlet of fluidized bed desulphurization unit 9.
It can be understood that the flue gas passes through the denitration device 5, the temperature reduction device 6, the fluidized bed desulfurization device 9, and the first dust remover 10 in this order.
The injection device injects water to the fluidized bed desulfurization device 9, thereby realizing the cooling and humidifying of the flue gas, and the flue gas after cooling and humidifying and the flue gas after heatingThe added desulfurizer is mixed strongly in a high-density bed layer for reaction, and SO in the flue gas is removed2、SO3Acidic gaseous contaminants such as HCl, HF, etc. Meanwhile, due to the action of the large specific surface area of the high-concentration alkaline solid particles in the circulating fluidized bed and the high-efficiency mass and heat transfer environment, an adsorbent is not required to be added, almost all divalent Hg and most elements Hg and dioxin in the flue gas are absorbed, adsorbed and removed, and the standard discharge of heavy metals Hg and dioxin in the flue gas can be realized. And, in combination with the activation of the uniformly atomized water in the fluidized bed desulfurization unit 9, a substantial portion of the fine particulate matter, such as PM, in the fluidized bed2.5、PM10And the like, can humidify and condense into flocculent large particles, and improve the particle size of the particles at the outlet of the dry desulfurization absorption tower of the circulating fluidized bed.
The utility model provides a purification system's of cement kiln tail flue gas purification principle: denitration is carried out on the flue gas through a denitration device 5, and the denitration flue gas is cooled through a cooling device 6; removing acidic gases such as sulfide, hydrogen chloride and fluoride in the flue gas through a fluidized bed desulfurization device 8, and adsorbing and removing heavy metals and organic pollutants; the dust is removed by the first dust collector 10.
The utility model provides an among the clean system of cement kiln tail flue gas, provide the desulfurizer to fluidized bed desulphurization unit 9 through desulfurizer storehouse 18, spray water in to fluidized bed desulphurization unit 9 through injection apparatus, then the high density granule bed of fluidized bed desulphurization unit 9 has huge surface area, huge adsorption mechanism has been formed under the effect of fiercely turbulent air current, combine the absorption reaction mechanism of the high-efficient mass transfer heat transfer of fluidized bed, make fluidized bed desulphurization unit 9 have the dual purification ability of high-efficient absorption and absorption, thereby realize the acid gas such as sulphide, hydrogen chloride, fluoride, heavy metal and organic pollutant's high-efficient desorption; moreover, the combination of the injection device to inject water into the fluidized bed desulfurization device 9, most fine particles of the fluidized bed desulfurization device 9 can be humidified, condensed and formed into flocculent large particles, and the particle size of the outlet particles of the fluidized bed desulfurization device 9 is improved, so that the dust removal effect of the subsequent first dust remover 10 is improved. Therefore, the purification system for the cement kiln tail gas meets the requirement of ultralow emission and can remove the multi-component pollutants synergistically.
Preferably, the denitration device 5 is an SCR denitration device, that is, a selective catalytic reduction denitration device.
Preferably, the desulfurizing agent is one or a combination of more of slaked lime and carbide slag. Of course, the desulfurizing agent is also selected according to actual needs, and is not limited to the above.
The cooling device 6 is one or a plurality of combinations of a humidifying tower, a waste heat boiler and a cold air valve. For example, the cooling device 6 is a humidifying tower, or the cooling device 6 includes a waste heat boiler and a cold air valve connected in series, or the cooling device 6 includes a humidifying tower, a waste heat boiler and a cold air valve connected in series. In practical application, the specific type of the cooling device 6 can be selected according to needs, and is not limited to this.
Preferably, the fluidized bed desulfurization device 9 is a desulfurization tower. Of course, the fluidized bed desulfurization device 9 may be selected from other types, and is not limited thereto.
The type of the first dust collector 10 is selected according to actual needs, and preferably, the first dust collector 10 is an electric bag composite dust collector and/or a bag-type dust collector. For example, the first dust collector 10 includes an electrostatic fabric filter and a bag-type dust collector connected in series.
The denitration device 5 needs to use a catalyst. In order to reduce the poison of dust to the catalyst and reduce the system blockage and abrasion, the purification system of the cement kiln tail flue gas further comprises a second dust remover 4, and the inlet of the denitration device 5 is communicated with the flue gas outlet of the second dust remover 4. At this time, the flue gas firstly enters the second dust remover 4 and then enters the denitration device 5.
The type of the second dust collector 4 is selected according to actual needs, and preferably, the second dust collector 4 is one or a combination of an electric dust collector, an electric bag composite dust collector and a bag-type dust collector. For example, the second dust collector 4 is an electric dust collector, or the second dust collector 4 includes an electric bag composite dust collector and a bag-type dust collector connected in series.
In order to further improve the purification effect, in the purification system of the cement kiln tail flue gas, the filter cake layer material on the filter bag in the first dust remover 10 contains a desulfurizer, so that the SOx and the NOx in the flue gas can be further absorbed and removed while the dust in the flue gas is removed. The content of the desulfurizing agent in the material of the cake layer is selected according to actual needs, which is not limited in this embodiment.
The desulfurizer in the first dust collector 10 is discharged from the ash discharge port after reaction, and most of the discharged desulfurizer is not completely reacted. In order to meet the requirement of a bed layer of the fluidized bed desulfurization device and improve the utilization rate of the desulfurizer, the purification system of the cement kiln tail gas further comprises a circulating conveying device 17, and the circulating conveying device 17 is communicated with an ash discharge port of the first dust remover 10 and the fluidized bed desulfurization device 9.
In the system, part of the unreacted desulfurizer can be returned to the fluidized bed desulfurization device 9 through the circulating conveying device 17 for recycling, and a small part of completely reacted byproducts are discharged, enter the suspension preheater 3 and the decomposing furnace 2 along with raw materials for oxidation, and finally enter the cement kiln 1 for solidification into cement clinker.
The type of the above-mentioned circulation conveying means 17 is selected according to actual needs. Preferably, the circulating conveyor 17 is an air chute. Of course, other types may be selected, and are not limited thereto.
Above-mentioned cement kiln tail gas's clean system still includes adjusting device 13, and this adjusting device 13 includes: the device comprises an adjusting pipeline and an adjusting valve connected in series on the adjusting pipeline, wherein the adjusting pipeline is communicated with a flue gas outlet of the first dust remover 10 and the fluidized bed desulfurization device 9. Therefore, the purified flue gas can be returned to the fluidized bed desulfurization device 9 through the adjusting pipeline, so that the stable operation of the system is ensured when the flue gas volume is small.
The adjusting device 13 is used for adjusting the smoke gas quantity, temperature, humidity and SO when the raw material mill 7 is started or stopped2The working condition changes such as concentration and the cooling mode adopted by the cooling device 6 are completely adaptive.
In order to facilitate the desulfurizer to enter the fluidized bed desulfurization device 9, the desulfurizer bin 18 is connected in series with a pipeline communicated with an inlet of the fluidized bed desulfurization device 9. Therefore, the desulfurizer can enter the fluidized bed desulfurization device 9 under the pneumatic transmission in the pipeline, the structure is simplified, and the desulfurizer is convenient to transmit.
Above-mentioned cement kiln tail gas's clean system still includes: and the third dust remover 8 is connected in series between the temperature reduction device 6 and the fluidized bed desulfurization device 9. No setup may be required on the new project.
The type of the third dust separator 8 is selected according to actual needs. Preferably, the third dust collector 8 is one or a combination of an electric dust collector, an electric bag composite dust collector and a bag-type dust collector. For example, the third dust collector 8 is an electric dust collector, or the third dust collector 8 is a bag-type dust collector, or the third dust collector 8 includes an electric bag composite dust collector and a bag-type dust collector connected in series.
In order to ensure the transportation of the flue gas, the purification system of the cement kiln tail flue gas further comprises: and the first fan 21 is connected between the temperature reduction device 6 and the fluidized bed desulfurization device 9 in series.
The type of the first fan 21 is selected according to actual needs, and this embodiment does not limit this.
When the system comprises the third precipitator 8, the first fan 21 is located between the temperature reducing device 6 and the third precipitator 8.
Preferably, in the purification system for cement kiln tail gas, the gas outlet of the first dust remover 10 is communicated with the chimney 15 through the discharge pipeline 14, and the discharge pipeline 14 is connected in series with the second fan 16; the ash discharge port of the first dust collector 10 is communicated with a raw material warehouse 12 through a byproduct conveying device 11.
The type of the byproduct transport device 11 is selected according to actual needs. Preferably, the byproduct conveying device 11 is one or a combination of a pneumatic conveying device, a zipper machine, a bucket elevator and a belt conveyor.
Above-mentioned cement kiln tail gas's clean system still includes: a raw meal mill 7 connected in series between the temperature reduction device 6 and the fluidized bed desulfurization device 9. Preferably, the purification system for the tail flue gas of the cement kiln further comprises a bypass pipeline which is connected with the raw mill 7 in parallel; wherein, a bypass valve 19 is connected in series on the bypass pipeline, two valves 20 are connected in series on the pipeline which is connected in parallel with the bypass pipeline, and one valve 20, the raw meal mill 7 and the other valve 20 are connected in series in sequence.
In the purification system of the tail flue gas of the cement kiln, the flue gas passing through the cooling device 6 enters the raw material mill 7 to dry the raw material, and then enters the fluidized bed desulfurization device 9; if the raw material mill 7 stops, the flue gas passing through the cooling device 6 can enter the fluidized bed desulfurization device 9 through the bypass pipeline.
In order to further optimize the above technical solution, the second dust collector 4 and the denitration device 5 are an integrated structure.
Specifically, above-mentioned second dust remover 4 and denitrification facility 5 sharing base and steelframe save the use amount of whole occupation area and equipment steel to the cost is reduced.
Preferably, the dust removal efficiency of the second dust remover 4 is more than 80%; the outlet temperature of the cooling device 6 is 180-220 ℃; outlet NO of the denitrator 5xThe concentration is not more than 50mg/Nm3(ii) a The inlet flue gas temperature of the fluidized bed desulfurization device 9 is 100-220 ℃, the outlet flue gas temperature of the fluidized bed desulfurization device 9 is 10-15 ℃ above the water dew point, the bed layer pressure of the fluidized bed desulfurization device 9 is 800-1400 Pa, and the outlet SO of the fluidized bed desulfurization device 92The concentration is not more than 35mg/Nm3(ii) a The fluidized bed desulfurization device 9 is a desulfurization tower, the flow velocity of the flue gas in a Venturi section of the desulfurization tower is 30-70 m/s, and the flow velocity of the flue gas in a straight pipe section of the desulfurization tower is 3-7 m/s; the concentration of the smoke dust at the outlet of the first dust remover 10 is not more than 5mg/Nm3。
It should be noted that the desulfurization tower comprises a venturi section and a straight pipe section which are communicated with each other. The straight pipe section is located the top of venturi section, and the venturi section is from its bottom to its top gradually expand.
In practical applications, the above parameters may be selected to be other values, and are not limited to the above embodiments.
The purification system of cement kiln tail flue gas that this embodiment provided has realized the treatment to the flue gas, with the NO in the flue gasxControlled at 50mg/m3Hereinafter, SO2Controlled at 35mg/m3The smoke dust is controlled at 5mg/m3The ultra-low emission of atmospheric pollutants is realized; moreover, HC can be removed efficiently and synergisticallyl, HF, dioxin, heavy metals and other multi-component pollutants, and the whole system does not need to be antiseptic, has zero wastewater discharge, and has transparent discharge from a chimney 15.
In order to more specifically explain the purification system of the cement kiln tail gas provided by the embodiment, a specific embodiment is provided below.
As shown in FIG. 1, in the purification system of the tail flue gas of the cement kiln, the gas outlet of the cement kiln 1 is connected to the gas inlet of a decomposing furnace 2, the gas outlet of the decomposing furnace 2 is connected to the gas inlet of a suspension preheater 3, the gas outlet of the suspension preheater 3 is connected to the gas inlet side of a second dust remover 4, the gas inlet of a denitration device 5 is connected to the gas outlet of the second dust remover 4, the gas inlet of a temperature reduction device 6 is connected to the gas outlet of the denitration device 5, the gas outlet of the temperature reduction device 6 is connected to the gas inlet of a first fan 21, one path of the gas outlet of the fan 21 of a fluidized bed desulfurization device 9 enters the gas inlet of a raw meal mill 7, the other path enters the gas inlet of the third dust remover 8 through a bypass pipeline, the gas outlet of the raw meal mill 7 is also connected to the gas inlet of the third dust remover 8, the gas outlet of the third dust remover, the circulating ash inlet of the fluidized bed desulfurization device 9 and the ash inlet of the byproduct conveying device 11 are both connected with the ash discharge port of the first dust remover 10. The ash outlet of the by-product conveying device 11 is connected to the raw material warehouse 12. The air outlet of the first dust remover 10 is sequentially connected with a second fan 16 and a chimney 15, and the purified flue gas is discharged out of the chimney 15. The air inlet of the adjusting device 13 is connected to the air outlet of the second fan 16, the air outlet of the adjusting device 13 is connected to the air inlet of the fluidized bed desulfurization device 9, and the desulfurizing agent is fed into the fluidized bed desulfurization device 9 from the ash discharge port of the desulfurizing agent bin 18.
The working principle of the purification system of the cement kiln tail gas is as follows:
after passing through the cement kiln 1, the decomposing furnace 2 and the suspension preheater 3, the temperature of the flue gas is 350-400 ℃, the flue gas is dedusted by the second deduster 4, enters the denitration device 5 for denitration, and then enters the cooling device 6. The temperature of the cooled flue gas is reduced to 180-220 ℃, and then the flue gas enters the raw material mill 7 through the first fan 21 to dry the raw materials and enters the third removerCollecting dust by a dust collector 8, and reducing the temperature of the flue gas to 100-120 ℃; if the raw material mill stops, the flue gas can directly enter the third dust remover 8 for dust collection through the bypass pipeline, the flue gas after dust removal sequentially passes through the fluidized bed desulfurization device 9 and the first dust remover 10, the temperature of the flue gas is reduced to 70-95 ℃ from 100-220 ℃, and SO in the flue gas2、NOxDust, SO3Multiple pollutants such as HF, HCl, mercury, dioxin and the like are removed efficiently and synergistically. The purified flue gas is discharged out of the chimney 15 under the action of the second fan 16. A part of the byproducts separated from the first dust remover 10 are conveyed to the raw material warehouse 12 for recycling under the action of the byproduct conveying device 11, and the other part of the byproducts enter the fluidized bed desulfurization device 9 for recycling through the recycling conveying device 17. The adjusting device 13 realizes automatic adjustment according to the change of the preceding stage working condition through the pressure difference between the outlet of the second fan 16 and the inlet of the fluidized bed desulphurization device 9 and an automatic control loop.
In the above examples, the clinker produced by cement is 2500t/d, and the smoke gas amount is 250000Nm3H, flue gas NO discharged by the suspension preheater 3xThe concentration is about 400mg/Nm3，SO2The concentration is about 1500mg/Nm3. Using Ca (OH)2As a desulfurizing agent, the Ca/S ratio was 1.4. The desulfurization efficiency of the purification system of the tail flue gas of the cement kiln can reach more than 99 percent at most, the denitration efficiency can reach more than 90 percent, and the control of the smoke dust to 5mg/m is ensured3The method has the advantages of simple process flow, simple and convenient operation, stable operation and capability of synergistically and efficiently removing SO3HF, HCl, mercury, dioxin and other pollutants, and no waste water and waste residue are generated, and no anticorrosive treatment is needed.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A purification system of cement kiln tail gas, characterized by includes:
a denitration device (5),
a cooling device (6) communicated with the outlet of the denitration device (5),
a fluidized bed desulfurization device (9) communicated with the outlet of the cooling device (6),
a desulfurizer bin (18) for supplying desulfurizer to the fluidized bed desulfurizer (9),
a spraying device for spraying water to the fluidized bed desulfurization device (9),
a first dust remover (10) communicated with the outlet of the fluidized bed desulfurization device (9).
2. The purification system according to claim 1, further comprising a second precipitator (4), the denitrification device (5) being in communication with a flue gas outlet of the second precipitator (4).
3. The purification system according to claim 1, further comprising a circulating conveyor (17), wherein the circulating conveyor (17) is communicated with the ash discharge port of the first dust remover (10) and the fluidized bed desulfurization device (9);
wherein the material of the powder cake layer on the filter bag in the first dust remover (10) contains a desulfurizing agent.
4. The purification system according to claim 1, further comprising a conditioning device (13), the conditioning device (13) comprising: the device comprises an adjusting pipeline and an adjusting valve connected to the adjusting pipeline in series, wherein the adjusting pipeline is communicated with a flue gas outlet of the first dust remover (10) and the fluidized bed desulfurization device (9).
5. The purification system according to claim 1, characterized in that the desulfurization agent silo (18) is connected in series on a pipe communicating with the inlet of the fluidized bed desulfurization device (9).
6. The purification system of claim 1, further comprising: and the third dust remover (8) is connected in series between the cooling device (6) and the fluidized bed desulfurization device (9).
7. The purification system of claim 1, further comprising: and the first fan (21) is connected in series between the cooling device (6) and the fluidized bed desulfurization device (9).
8. The purification system of claim 1,
the flue gas outlet of the first dust remover (10) is communicated with a chimney (15) through a discharge pipeline (14), and a second fan (16) is connected on the discharge pipeline (14) in series;
and an ash discharge port of the first dust remover (10) is communicated with the raw material warehouse (12) through a byproduct conveying device (11).
9. The purification system of claim 1, further comprising: the raw meal mill (7) is connected between the cooling device (6) and the fluidized bed desulfurization device (9) in series, and the bypass pipeline is connected with the raw meal mill (7) in parallel;
wherein, bypass valve (19) is connected in series on the bypass pipeline, two valves (20) are connected in series on the pipeline connected in parallel with the bypass pipeline, one valve (20), raw meal mill (7) and another valve (20) are connected in series in turn.
10. The purification system according to claim 2, wherein the second precipitator (4) and the denitrification device (5) are of an integrated structure.
11. The purification system of claim 2 or 10,
the dust removal efficiency of the second dust remover (4) is more than 80 percent;
the outlet temperature of the cooling device (6) is 180-220 ℃;
outlet NO of the denitration device (5)xThe concentration is not more than 50mg/Nm3；
The inlet flue gas temperature of the fluidized bed desulfurization device (9) is 100-220 ℃, the outlet flue gas temperature of the fluidized bed desulfurization device (9) is 10-15 ℃ above the water dew point, the bed pressure of the fluidized bed desulfurization device (9) is 800-1400 Pa, and the outlet SO of the fluidized bed desulfurization device (9)2The concentration is not more than 35mg/Nm3；
The fluidized bed desulfurization device (9) is a desulfurization tower, the flow velocity of the flue gas in a Venturi section of the desulfurization tower is 30-70 m/s, and the flow velocity of the flue gas in a straight pipe section of the desulfurization tower is 3-7 m/s;
the outlet smoke concentration of the first dust remover (10) is not more than 5mg/Nm3。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020163678.2U CN212440685U (en) | 2020-02-12 | 2020-02-12 | Purification system for tail flue gas of cement kiln |
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| CN202020163678.2U CN212440685U (en) | 2020-02-12 | 2020-02-12 | Purification system for tail flue gas of cement kiln |
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