CN216825658U - Powdery spent coke recycling system for desulfurized granular coke - Google Patents
Powdery spent coke recycling system for desulfurized granular coke Download PDFInfo
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- CN216825658U CN216825658U CN202220607347.2U CN202220607347U CN216825658U CN 216825658 U CN216825658 U CN 216825658U CN 202220607347 U CN202220607347 U CN 202220607347U CN 216825658 U CN216825658 U CN 216825658U
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Abstract
The utility model discloses a powdery spent coke recycling system of desulfurized granular coke, which comprises a shell, a fluidized layer and a filtering and collecting device, wherein the fluidized layer and the filtering and collecting device are both arranged inside the shell, the fluidized layer is sequentially provided with a flue gas distribution layer, a desulfurization area and a denitration area from bottom to top, a plurality of gas distribution pipes are arranged in the flue gas distribution layer, the gas distribution pipes are provided with spray heads, and the flue gas distribution layer is used for being connected with a flue gas source; powdery spent coke is filled in the desulfurization zone and the denitrification zone; an ammonia inlet is formed in the side wall of the shell of the denitration area and is used for being connected with an ammonia source; the filtering and collecting device is positioned at the top of the shell and comprises a plurality of filtering cylinders and a gas collecting cavity, fine through holes are distributed on the filtering cylinders, the filtering cylinders are communicated with the gas collecting cavity, and the gas collecting cavity is communicated with the outside.
Description
Technical Field
The utility model belongs to the technical field of flue gas desulfurization denitration, specifically belong to a likepowder weary burnt system of recycling that desulfurization granule is burnt.
Background
The statements herein merely provide background related to the present disclosure and may not necessarily constitute prior art.
At present, the desulfurization and denitrification technology of the active coke is popularized and applied in the industries of steel, metallurgy and coking in a large scale, and granular formed active coke is adopted. In the adsorption/desorption process of the granular coke, because the collision abrasion of the granules causes coke loss, a large amount of new active coke needs to be consumed, and simultaneously, more powdery spent coke is generated. The powdery spent coke is generated after the granular coke is collided and abraded, belongs to the physical loss of active coke, has reduced particle size, still has rich specific surface area and pore structure, and has good adsorption property, but due to the structural limitation of adsorption equipment, the powdery active coke cannot be used in the traditional granular coke adsorption reactor and is generally used as fuel, so that the resource waste is caused.
SUMMERY OF THE UTILITY MODEL
To the deficiency that prior art exists, the utility model aims at providing a likepowder weary burnt system of recycling of desulfurization granule burnt.
In order to achieve the above purpose, the present invention is realized by the following technical solution:
a powdery spent coke recycling system of desulfurized granular coke comprises a turbulent desulfurization and denitrification device, a fluidized layer and a filtering and collecting device, wherein the fluidized layer and the filtering and collecting device are both arranged in a shell,
the fluidized layer is sequentially provided with a flue gas distribution layer, a desulfurization area and a denitration area from bottom to top, a plurality of gas distribution pipes are arranged in the flue gas distribution layer, spray heads are arranged on the gas distribution pipes, and the flue gas distribution layer is used for being connected with a flue gas source; powdery spent coke is filled in the desulfurization zone and the denitrification zone;
an ammonia gas inlet is formed in the side wall of the shell of the denitration area and is used for being connected with an ammonia gas source;
the filtering and collecting device is positioned at the top of the shell and comprises a plurality of filtering cylinders and a gas collecting cavity, fine through holes are distributed on the filtering cylinders, the filtering cylinders are communicated with the gas collecting cavity, and the gas collecting cavity is communicated with the outside.
Above-mentioned the utility model discloses a beneficial effect that one or more embodiment gained as follows:
powdery spent coke still has the effect of better sulfur dioxide absorption and nitrogen oxide catalytic oxidation, sets up flue gas distribution layer bottom the casing, and the flue gas lets in evenly distributed inside the casing from flue gas distribution pipe, blows the powdery spent coke that loads in the casing, makes the fluidization of powdery spent coke, and the in-process of flue gas and the contact of powdery spent coke, sulfur dioxide in the flue gas is by the absorption desorption of powdery spent coke.
And ammonia gas is introduced into the denitration zone, and the nitrogen oxide in the flue gas reacts with the ammonia gas under the catalytic action of the powdery spent coke to remove the nitrogen oxide, so that the desulfurization and denitration of the flue gas by using the powdery spent coke are realized.
Set up flue gas filtration collection device in the top in denitration district for filter the desorption to the likepowder burnt of carrying in the flue gas, in order to reduce the solid of outer row flue gas and smuggle secretly.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is a system for recycling particulate char, desulfurized spent char, according to one or more embodiments of the present invention.
In the figure: the mutual spacing or size is exaggerated to show the position of each part, and the schematic diagram is only used for illustration;
1-sintering furnace; 2-a fan; 3-an adsorption column; 4-gas distribution cavity, 5-desorption tower; 6-a first chimney; 7-belt screening machine; 8-a chimney; 9-filtering the cylinder body; 10-a denitration zone; 11-a desulfurization zone; 12-a conveyor; 13-storage.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. 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.
A powdery spent coke recycling system of desulfurized granular coke comprises a turbulent desulfurization and denitrification device, a fluidized layer and a filtering and collecting device, wherein the fluidized layer and the filtering and collecting device are both arranged in a shell,
the fluidized layer is sequentially provided with a flue gas distribution layer, a desulfurization area and a denitration area from bottom to top, a plurality of gas distribution pipes are arranged in the flue gas distribution layer, spray heads are arranged on the gas distribution pipes, and the flue gas distribution layer is used for being connected with a flue gas source; powdery spent coke is filled in the desulfurization zone and the denitrification zone;
an ammonia gas inlet is formed in the side wall of the shell of the denitration area and is used for being connected with an ammonia gas source;
the filtering and collecting device is positioned at the top of the shell and comprises a plurality of filtering cylinders and a gas collecting cavity, fine through holes are distributed on the filtering cylinders, the filtering cylinders are communicated with the gas collecting cavity, and the gas collecting cavity is communicated with the outside.
In some embodiments, the filtering cylinder is vertically arranged, and the distance between the filtering cylinder and the denitration area is 0.3-1 m. Be provided with certain distance between filtering barrel and the denitration district for when the flue gas through SOx/NOx control flows through the cavity, the likepowder weary burnt that smugglies secretly falls back under the effect of self gravity in the flue gas, with the flue gas initial separation, in order to alleviate filtering barrel's filter pressure.
In some embodiments, the bottom of the turbulent desulfurization and denitrification device is provided with a funnel-shaped collecting bin, the bottom of the collecting bin is provided with an outlet, and the funnel-shaped collecting bin is positioned below the flue gas distribution layer.
Preferably, a conveyor is arranged below the funnel-shaped collecting bin and connected with the sintering furnace. The device is used for conveying the desulfurized and denitrated powdery spent coke to a sintering furnace for use as fuel.
Further preferably, the conveyor is a screw conveyor, and the conveying auger of the screw conveyor is arranged in the closed shell.
If the powdery spent coke is conveyed by a belt conveyor, dust is easily generated in the discharging and conveying processes, and the surrounding environment is polluted. The spiral conveyer provided with the closed shell can effectively avoid the generation of dust.
Preferably, the device further comprises an adsorption device which comprises a shell and a granular coke adsorption tower, granular coke is filled in the granular coke adsorption tower, through holes are uniformly distributed on the side wall of the granular coke adsorption tower, the region of the granular coke adsorption tower, in which the through holes are uniformly distributed, is located in the shell, and the inner part of the shell is divided into a gas distribution cavity and a gas collection cavity, wherein the gas distribution cavity is used for being connected with a flue gas source, and the gas collection cavity is used for being connected with a chimney.
The flue gas enters the gas distribution cavity and then enters the adsorption tower through the through holes on the side wall of the adsorption tower, and SO in the flue gas2Is adsorbed by the granular coke. Is deprived of SO2The flue gas flows out from the wall of the adsorption tower, flows into the gas collection cavity and enters a chimney through an outlet of the gas collection cavity to be discharged.
Further preferably, the number of the granular coke adsorption towers is 2-4, and the granular coke adsorption towers are connected in series. So as to improve the treatment effect on the sintering flue gas.
Further preferably, the device further comprises an analysis tower, the bottom of the granular coke adsorption tower is connected with the top of the analysis tower through a conveying device, and the bottom of the analysis tower is connected with the turbulent desulfurization and denitrification device through a belt screening machine.
The desorption tower is used for desorbing and regenerating the saturated adsorption granular coke, the granular coke is separated from the powdery spent coke after being screened by the belt screening machine, and the powdery spent coke is conveyed to the turbulent desulfurization and denitrification device for reutilization.
Still further preferably, the belt screen is connected with the top of the granular coke adsorption tower through a material conveying device.
And the device is used for adding the regenerated and screened granular materials into the granular coke adsorption tower again for reuse.
Still further preferably, the material conveying device is a material lifting device. And the device is used for lifting the resolved and regenerated material discharged from the bottom of the resolving tower to the top of the granular coke adsorption tower and adding the material into the granular coke adsorption tower again for recycling.
The present invention will be further explained with reference to the drawings and examples.
As shown in FIG. 1, the turbulent desulfurization and denitrification device of the powdery spent coke recycling system for desulfurized granular coke comprises a shell, a fluidized layer and a filtering and collecting device, wherein the fluidized layer and the filtering and collecting device are both arranged in the shell,
the fluidized layer is sequentially provided with a flue gas distribution layer, a desulfurization zone 11 and a denitration zone 10 from bottom to top, the flue gas distribution layer is internally provided with a plurality of gas distribution pipes, the gas distribution pipes are provided with spray heads, and the flue gas distribution layer is used for being connected with a flue gas source; powdery spent coke is filled in the desulfurization zone and the denitrification zone;
an ammonia gas inlet is formed in the side wall of the shell of the denitration zone 10 and is used for being connected with an ammonia gas source;
the filtering and collecting device is positioned at the top of the shell and comprises a plurality of filtering cylinders 9 and a gas collecting cavity, fine through holes are distributed on the filtering cylinders 9, the filtering cylinders 9 are communicated with the gas collecting cavity, and the gas collecting cavity is communicated with the outside.
The vertical setting of filter cylinder 9, the distance of filter cylinder 9 and denitration district 10 is 1 m.
The bottom of turbulent desulfurization and denitrification device is provided with hopper-shaped collecting bin, and the bottom of collecting bin is provided with the export, and hopper-shaped collecting bin is located the below on flue gas distribution layer.
A conveyor 12 is arranged below the funnel-shaped collecting bin, and the conveyor 12 is connected with the sintering furnace 1. The conveyor 12 is a screw conveyor, and a conveying auger thereof is arranged in the closed shell.
The adsorption device comprises a shell and a granular coke adsorption tower 3, wherein granular coke is filled in the granular coke adsorption tower 3, through holes are uniformly distributed on the side wall, the region of the uniformly distributed through holes of the granular coke adsorption tower 3 is positioned in the shell, the inner part of the shell is divided into an air distribution cavity 4 and an air collection cavity, the air distribution cavity is used for being connected with a flue gas source, and the air collection cavity is used for being connected with a chimney.
The number of the granular coke adsorption towers 3 is 2-4, and the granular coke adsorption towers 3 are mutually connected in series. So as to improve the treatment effect on the sintering flue gas.
The bottom of the granular coke adsorption tower 3 is connected with the top of the desorption tower 5 through a conveying device, and the bottom of the desorption tower 5 is connected with the turbulent desulfurization and denitrification device through a belt screening machine 7.
The belt screening machine 7 is connected with the top of the particle coke adsorption tower 3 through a material conveying device.
The material conveying device is a material lifting device and is used for lifting the resolved and regenerated material discharged from the bottom of the resolving tower 5 to the top of the granular coke adsorption tower 3 and adding the resolved and regenerated material to the granular coke adsorption tower 3 again for recycling.
The powder active coke and the granular active coke firstly enter a regeneration device to remove adsorbed pollutants, then are sent to the upper part of a turbulent bed and are sprayed with ammonia gas, the reduction of NOx is realized under the catalytic action of the active coke, the denitrated active coke downwards runs and enters an adsorption desulfurization section to adsorb oxysulfide in flue gas, and the active coke after saturated adsorption is sent to a sintering machine to be used as fuel; SO in sintering flue gas2The concentration is increased slightly and is removed by the granular coke desulfurization process.
The coke breeze is cheap, is generated after the granular coke is collided and abraded, belongs to the physical loss of the activated coke, has reduced particle size, still has rich specific surface area and pore structure and has good adsorption characteristic, but the powdery activated coke cannot be used in the traditional granular coke adsorption reactor due to the adsorption equipment. Powdery spent coke screened in the traditional granular coke desulfurization and denitrification process can be used as an adsorbent, so that the control of flue gas sulfur dioxide of other pollution sources in an iron and steel plant is realized, and the system operation cost is reduced.
Adopts a turbulent bed reactor and adopts the integrated design of desulfurization, denitrification and dust removal to realize SO2Integration of NOx and dust synergistically results in ultra low emissions. The equipment occupies a small area and is suitable for flue gas treatment of different scales; the materials are conveyed in a pneumatic conveying mode, are totally closed, and are clean and tidy on site.
The coke breeze firstly enters a regeneration device to remove adsorbed pollutants, then is sent to the upper part of the turbulent bed and is sprayed with ammonia gas, and the reduction of NOx is realized under the catalytic action of active coke; the denitrated active coke downwards runs into an adsorption desulfurization section to adsorb oxysulfide in the flue gas. Wherein the reaction formula in the turbulent bed is as follows: (. in adsorption state)
And (3) desulfurization:
SO2(g)→SO2*；
O2(g)→2O*；
H2O(g)→H2O*；
SO2*+O*→SO3*；
SO3*+H2O*→H2SO4*。
denitration:
NO(g)→NO*；
O2(g)→2O*；
NH3(g)→NH3*；
NO*+O*→NO2*；
8NO2*+6NH3*→7N2+12H2O*。
has the advantages that a plurality of pollutants are removed simultaneously, and SO can be removed cooperatively2、SO3HCl, HF, VOCs, dioxins, heavy metals (Hg); the loss of the active coke is small, the inactive active coke is directly sent into a boiler or a sintering system for utilization, and no solid waste exists; the dry desulfurization process has low water consumption and almost no wastewater discharge; realize the resource utilization of sulfur and the SO after the thermal regeneration2Enriching, and can be used for preparing sulfuric acid or sulfur.
And after adsorption, the powdery spent coke is conveyed to a sintering machine to be used as fuel. Burnt out SO2And the mixture enters a desulfurization process matched with a sintering machine for removal.
The active coke flue gas treatment technology utilizes the adsorption and catalysis functions of the active coke to ensure that SO in the flue gas2And H2O and O2Reaction to form H2SO4Storing the active coke in the active coke hole; leading NOx in the flue gas to have reduction reaction with NH3 to generate N2And H2O; realize SO in the flue gas2And the synergistic control of NOx and the synergistic control of multiple pollutants such as VOCs, HCl, HF, Hg, dioxin and the like can be realized.
Adsorption of SO2The activated coke is heated and regenerated to release high-concentration SO2Gas, regenerated active coke recycled, high concentration SO2Can be processed into sulfuric acid, elemental sulfur, sulfate and other chemical products. Therefore, the activated coke desulfurization and denitrification technology can realize the resource utilization of sulfur and the synergistic removal of multiple pollutants, does not consume water, and is a promising pollutant synergistic control technology.
The powdery spent coke is used as an adsorbent, new granular active coke and spent coke of the sintering flue gas active coke desulfurization and denitrification process of a certain steel and iron plant in China are sampled, and the adsorption performance is tested: the sulfur capacity of the new granular coke is 23.23 mg/g; the sulfur capacity absorbed by the dead coke is 33.2 mg/g; the adsorption sulfur capacity after the regeneration of the spent coke is 40.85mg/g, so that the spent coke has good adsorption characteristic, and the adsorption rate is 2-3 orders of magnitude higher than that of granular coke.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a likepowder burnt system of recycling of desulfurization granule coke which characterized in that: the turbulent desulfurization and denitrification device comprises a shell, a fluidized layer and a filtering and collecting device, wherein the fluidized layer and the filtering and collecting device are both arranged in the shell,
the fluidized layer is sequentially provided with a flue gas distribution layer, a desulfurization area and a denitration area from bottom to top, a plurality of gas distribution pipes are arranged in the flue gas distribution layer, spray heads are arranged on the gas distribution pipes, and the flue gas distribution layer is used for being connected with a flue gas source; powdery spent coke is filled in the desulfurization zone and the denitrification zone;
an ammonia gas inlet is formed in the side wall of the shell of the denitration area and is used for being connected with an ammonia gas source;
the filtering and collecting device is positioned at the top of the shell and comprises a plurality of filtering cylinders and a gas collecting cavity, fine through holes are distributed on the filtering cylinders, the filtering cylinders are communicated with the gas collecting cavity, and the gas collecting cavity is communicated with the outside.
2. The system of claim 1 for the reuse of desulfurized granular coke spent char in powder form, wherein: the filtering cylinder is vertically arranged, and the distance between the filtering cylinder and the denitration area is 0.3-1 m.
3. The system of claim 1 for the reuse of desulfurized granular coke spent char in powder form, wherein: turbulent motion SOx/NOx control device's bottom is provided with leaks hopper-shaped collection storehouse, and the bottom of collecting the storehouse is provided with the export, leaks hopper-shaped collection storehouse and is located the below of flue gas distribution layer.
4. The system of claim 3 for the reuse of desulfurized granular coke spent char in powder form, wherein: and a conveyor is arranged below the funnel-shaped collecting bin and connected with the sintering furnace.
5. The system of claim 4 for the reuse of desulfurized granular coke spent char in powder form, wherein: the conveyer is a screw conveyer, and a conveying auger of the conveyer is arranged in the closed shell.
6. The system of claim 1 for the reuse of desulfurized granular coke spent char in powder form, wherein: the device comprises a shell, a particle coke adsorption tower, a gas distribution cavity and a gas collection cavity, wherein the particle coke adsorption tower is filled with particle coke, through holes are uniformly distributed in the side wall of the particle coke adsorption tower, the region where the through holes are uniformly distributed in the particle coke adsorption tower is located in the shell, the inner part of the shell is divided into the gas distribution cavity and the gas collection cavity, the gas distribution cavity is used for being connected with a flue gas source, and the gas collection cavity is used for being connected with a chimney.
7. The system of claim 6 for the reuse of desulfurized granular coke spent char in powder form, wherein: the number of the particle coke adsorption towers is 2-4, and the particle coke adsorption towers are connected in series.
8. The system for the recycling of powdery spent coke of desulfurized granular coke according to claim 6 or 7, characterized in that: still include the analytic tower, the bottom of granule burnt adsorption tower is passed through conveyor and is connected with analytic tower top, and analytic tower bottom is through belt screening machine with turbulence SOx/NOx control device is connected.
9. The system of claim 8 for the reuse of desulfurized granular coke spent char in powder form, wherein: the belt screening machine is connected with the top of the particle coke adsorption tower through a material conveying device.
10. The system of claim 9 for the reuse of pulverized spent coke from desulfurized granular coke, wherein: the material conveying device is a material lifting device.
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