CN214635303U - Coke oven flue gas desulfurization and denitrification system for fluidizing and homogenizing desulfurized ash - Google Patents
Coke oven flue gas desulfurization and denitrification system for fluidizing and homogenizing desulfurized ash Download PDFInfo
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- CN214635303U CN214635303U CN202023022297.1U CN202023022297U CN214635303U CN 214635303 U CN214635303 U CN 214635303U CN 202023022297 U CN202023022297 U CN 202023022297U CN 214635303 U CN214635303 U CN 214635303U
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Abstract
The utility model relates to a fluidized homogenized desulfurization ash coke oven flue gas desulfurization and denitrification system, which comprises a desulfurizer storage and output unit, a high-speed fan, a hot desulfurization ash dust removal unit, an SCR denitration reactor, a hot desulfurization ash conveying unit, a pneumatic homogenization bin, a Roots fan, a dust removal unit, a powerful fan and a chimney; the utility model discloses add a strength homogenization storehouse of high-efficient fluidization stirring desulfurization ash in SDS dry process desulfurization and deNOx systems, through online gas fluidization homogenization process, make the composition of desulfurization ash obtain stably, the desulfurization ash after the homogenization can regard as Na2SO4Chemical raw materials, thereby realizing the recycling of industrial solid wastes and reducing the cost of SDS dry desulphurization.
Description
Technical Field
The utility model relates to a coke oven gas cleaning technical field especially relates to a desulfurization ash homogenization system based on SDS method dust pelletizing system.
Background
With the rapid development of social economy in China, dust and SO are generated in the coking industry2And pollution caused by flue gas of NOx and the like are becoming serious. The national environmental protection emission requirements for atmospheric pollutants are more and more strict, the pollutant emission control force of related enterprises is continuously increased, and the smoke gas control of the metallurgical steel industryIncreasing attention is being paid. Since 2018, the state enforces stricter emission standards of gas-fired boilers and limits the application of wet desulphurization process, so the SDS dry desulphurization process becomes the preferred process for coke oven flue gas desulphurization of large domestic steel union enterprises.
Compared with other desulfurization processes, the SDS dry desulfurization process has the advantages of short flow, low one-time investment, small occupied area, low operation cost, simple operation and maintenance and the like, and the smoke is treated by adopting the full dry method, so that a large amount of white smoke of a chimney is effectively avoided. The flue gas temperature of the desulfurization system is high and basically consistent with the inlet flue gas temperature of the desulfurization tower. Meanwhile, the SDS dry desulphurization process has good unit load regulation adaptability, and can ensure reliable, stable and continuous operation of a desulphurization system. The concentration of the pollutant components in the discharged coke oven smoke purified by combining SDS dry desulfurization with SCR medium-low temperature denitration technology can meet the special emission limit requirement in GB 16171-2012 emission Standard of pollutants for coking chemical industry.
However, the desulfurized fly ash as the by-product of the SDS dry desulfurization is complex in composition, and the main component of the desulfurized fly ash comprises Na2SO4、Na2SO3And Na2CO3And has the disadvantage of unstable composition, rich in Na2SO4The desulfurized fly ash is difficult to be used as a chemical raw material, and is not beneficial to recycling industrial solid wastes and reducing the desulfurization cost.
The utility model discloses parallelly connected a high-efficient fluidization stirring desulfurization ash's gas homogenization system at SDS's pipe-line system, make the composition of desulfurization ash obtain stably, make it can regard as Na2SO4 industrial chemicals (Na2SO4 market unit price is about 600-.
Disclosure of Invention
The utility model provides a coke oven flue gas desulfurization and denitrification system of fluidization homogenization desulfurization ash adds the strength homogenization storehouse of a high-efficient fluidization stirring desulfurization ash in SDS dry process desulfurization and denitrification system, through online gas fluidization homogenization process, makes the composition of desulfurization ash obtain stably, and desulfurization ash after the homogenization can regard as Na2SO4Chemical raw materials, thereby realizing the recycling of industrial solid wastes and reducing the cost of SDS dry desulphurization.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a coke oven flue gas desulfurization and denitrification system for fluidizing and homogenizing desulfurization ash comprises a desulfurizer storage and output unit, a high-speed fan, a hot desulfurization ash dedusting unit, an SCR denitration reactor, a hot desulfurization ash conveying unit, a pneumatic homogenizing bin, a Roots fan, a dedusting unit, a powerful fan and a chimney;
the air outlet of the high-speed fan is connected with the flue gas inlet of the hot desulfurization ash dust removal unit through a flue gas desulfurization pipeline, and a desulfurizer spraying inlet and a flue gas inlet are sequentially arranged on the flue gas desulfurization pipeline along the gas flowing direction; the desulfurizer spraying port is connected with a desulfurizer storage and output unit; the flue gas inlet is connected with a flue gas pipeline led out from a combustion chamber of the coke oven;
an ash outlet of the thermal desulfurization ash dust removal unit is connected with a desulfurization ash inlet at the top of the pneumatic homogenization bin through a thermal desulfurization ash conveying unit, and a gas outlet of the thermal desulfurization ash dust removal unit is sequentially connected with the SCR denitration reactor, the strong fan and the chimney through a gas conveying pipeline I;
the bottom of the pneumatic homogenizing bin is provided with a plurality of blowing ports which are connected with a Roots blower through a fluidizing gas pipeline; the top of the pneumatic homogenizing bin is provided with a gas outlet which is connected with a gas inlet of the dust removal unit through a gas conveying pipeline II, and the gas outlet of the dust removal unit is connected with a gas conveying pipeline I at the downstream of the SCR denitration reactor through a gas conveying pipeline III.
The desulfurizer storage and output unit comprises an SDS powder bin, a feeding metering scale and a micro roller press; the SDS powder bin is used for storing desulfurizer, the desulfurizer outlet at the bottom of the SDS powder bin is connected with a flue gas desulfurization pipeline through a desulfurizer output pipeline, and a feeding metering scale and a micro roller press are sequentially arranged on the desulfurizer output pipeline along the desulfurizer output direction.
The hot desulfurization ash dust removal unit comprises a first bag-type dust remover; 2 bag-type dust collectors are arranged side by side and run alternately; the cloth bag of the first cloth bag dust remover adopts a glass fiber bag.
The dust removal unit comprises a second bag-type dust remover; 2 bag dust collectors are arranged side by side and run alternately.
The hot desulfurization ash conveying unit comprises a horizontal spiral conveyor, a first material guide chute, an inclined spiral conveyor and a second material guide chute; the first bag-type dust collector and the second bag-type dust collector are arranged in parallel, the bottom of the first bag-type dust collector and the bottom of the second bag-type dust collector are respectively provided with an ash collecting hopper, and the bottom of the ash collecting hopper is provided with an ash outlet which is connected with a feed inlet of the horizontal spiral conveyor; the discharge port of the horizontal screw conveyer is connected with the feed inlet at the bottom of the inclined screw conveyer through a first guide chute, and the discharge port at the top of the inclined screw conveyer is connected with the desulfurized fly ash inlet at the top of the pneumatic homogenizing bin through a second guide chute.
The pneumatic homogenizing bin consists of a bin body, a central pipe and a plurality of breathable plates; a central pipe is arranged in the center of the bin body along the height direction, a blowing opening is arranged at the bottom of the bin body corresponding to the central pipe, and the blowing opening is connected with a fluidizing gas pipeline through a blowing gas main pipeline; a plurality of air permeable plates are arranged at the lower part of the bin body along the circumferential direction, and the height-direction space of the bin body corresponding to each air permeable plate is an air distribution chamber; the bottom of the bin body corresponding to each gas distribution chamber is respectively provided with a blowing port which is connected with a fluidizing gas pipeline through a corresponding blowing gas branch pipeline; the pneumatic homogenizing bin is provided with a connector pipe capable of lifting right above the corresponding central pipe, one end of the connector pipe in the pneumatic homogenizing bin is used for being connected with the central pipe, and the other end of the connector pipe is connected with the material storage barrel warehouse through a homogenizing desulfurized ash conveying pipeline.
The main blowing gas pipeline is provided with a check valve, and the branch blowing gas pipelines are respectively provided with a valve.
The flue gas pipeline is connected with a chimney through a standby pipeline.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) through the fluidization homogenization process, the desulfurization ash generated by different SDS desulfurization and denitrification systems in the whole coking plant can be treated, so that the components of the desulfurization ash are changed from fluctuation to stability, and the desulfurization ash which is usually used as industrial solid waste is changed into anhydrous sodium sulphate raw material;
(2) the anhydrous sodium sulphate particles with high specific surface area are subjected to fluidization homogenization, and the morphology of the anhydrous sodium sulphate particles is not changed, so that the anhydrous sodium sulphate particles have high reaction activity when being used;
(3) after dust in the process of stirring the desulfurized ash is removed by a bag type dust remover, a gas path of clean gas and a gas path of denitration gas are connected in parallel and then led out by a powerful exhaust fan and discharged into the atmosphere through a chimney, and the temperature of the discharged gas is reduced;
(4) the pneumatic stirring warehouse can perform centralized homogenization treatment on the SDS (sodium dodecyl sulfate) desulfurized ash of the coke oven in the range of the whole coke-oven plant, has high stirring capacity, good stirring effect and high stirring efficiency, and can reduce the component fluctuation of 50-300 tons of desulfurized ash by more than 10 times within 10 minutes;
(5) the pneumatic stirring storehouse can be used as a powder pneumatic conveying device, so that the service performance of the gas homogenizing system is improved.
Drawings
FIG. 1 is a schematic structural diagram of a fluidized homogenized desulfurized ash coke oven flue gas desulfurization and denitrification system of the present invention.
FIG. 2 is a schematic structural diagram of the desulfurized fly ash dedusting unit and the desulfurized fly ash pneumatic homogenizing unit of the present invention.
Fig. 3 is a schematic diagram of the distribution of the air permeable plate in the pneumatic homogenization bin of the present invention.
In the figure: 1. the high-speed fan 2, the SDS powder bin 3, the feeding metering scale 4, the miniature roller press 5, the coke oven combustion chamber 6, the flue gas pipeline 7, the flue gas desulfurization pipeline 8, the standby pipeline 9, the first bag-type dust remover 10, the ash collecting hopper 11, the first gas conveying pipeline 12, the SCR denitration reactor 13, the strong fan 14, the chimney 15, the second bag-type dust remover 16, the horizontal screw conveyor 17, the first material guide chute 18, the inclined screw conveyor 19, the second material guide chute 20, the second gas conveying pipeline 21, the third gas conveying pipeline 22, the pneumatic homogenizing bin 22-1, the bin body 22-2, the central pipe 22-3, the gas permeable plate 23, the Roots fan 24, the fluidized gas pipeline 25, the main blowing gas pipeline 26, the branch blowing gas pipeline 27, the valve 28, the interface pipe 29, the homogenized desulfurization ash output pipeline 30, the storage bin 31 and the check valve.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1 and fig. 2, the flue gas desulfurization and denitrification system for fluidized homogenized desulfurization ash coke oven of the present invention comprises a desulfurizing agent storage and output unit, a high speed fan 1, a thermal desulfurization ash dust removal unit, an SCR denitration reactor 12, a thermal desulfurization ash conveying unit, a pneumatic homogenization bin 22, a roots fan 23, a dust removal unit, a strong fan 13 and a chimney 14;
the air outlet of the high-speed fan 1 is connected with the flue gas inlet of the hot desulfurization ash dust removal unit through a flue gas desulfurization pipeline 7, and a desulfurizer spraying inlet and a flue gas inlet are sequentially arranged on the flue gas desulfurization pipeline 7 along the gas flowing direction; the desulfurizer spraying port is connected with a desulfurizer storage and output unit; the flue gas inlet is connected with a flue gas pipeline 6 led out from a combustion chamber 5 of the coke oven;
an ash outlet of the thermal desulfurization ash dust removal unit is connected with a desulfurization ash inlet at the top of the pneumatic homogenization bin 22 through a thermal desulfurization ash conveying unit, and a gas outlet of the thermal desulfurization ash dust removal unit is sequentially connected with the SCR denitration reactor 12, the powerful fan 13 and the chimney 14 through a gas conveying pipeline I11;
the bottom of the pneumatic homogenizing bin 22 is provided with a plurality of blowing ports which are connected with a Roots blower 23 through a fluidizing gas pipeline 24; the top of the pneumatic homogenizing bin 22 is provided with a gas outlet which is connected with a gas inlet of the dust removal unit through a second gas conveying pipeline 20, and the gas outlet of the dust removal unit is connected with a first gas conveying pipeline 11 at the downstream of the SCR denitration reactor 12 through a third gas conveying pipeline 21.
The desulfurizer storage and output unit comprises an SDS powder bin 2, a feeding metering scale 3 and a micro roller press 4; the SDS powder bin 2 is used for storing desulfurizer, the desulfurizer outlet at the bottom of the SDS powder bin 2 is connected with a flue gas desulfurization pipeline 7 through a desulfurizer output pipeline, and a feeding metering scale 3 and a micro roller press 4 are sequentially arranged on the desulfurizer output pipeline along the desulfurizer output direction.
The hot desulfurization ash dust removal unit comprises a first bag-type dust remover 9; 2 bag dust collectors I9 are arranged side by side and run alternately; the cloth bag of the cloth bag dust remover I9 adopts a glass fiber bag.
The dust removal unit comprises a second bag-type dust remover 15; 2 bag dust collectors 15 are arranged side by side and run alternately.
The hot desulfurization ash conveying unit comprises a horizontal spiral conveyor 16, a first material guide chute 17, an inclined spiral conveyor 18 and a second material guide chute 19; the first bag-type dust collector 9 and the second bag-type dust collector 15 are arranged side by side, the bottom of the first bag-type dust collector 9 and the bottom of the second bag-type dust collector 15 are respectively provided with an ash collecting hopper 10, and the bottom of the ash collecting hopper 10 is provided with an ash outlet which is connected with a feed inlet of a horizontal spiral conveyor 16; the discharge port of the horizontal screw conveyer 16 is connected with the feed port at the bottom of the inclined screw conveyer 18 through a first material guide chute 17, and the discharge port at the top of the inclined screw conveyer 18 is connected with the desulfurized fly ash inlet at the top of the pneumatic homogenizing silo 22 through a second material guide chute 19.
The pneumatic homogenizing bin 22 consists of a bin body 22-1, a central pipe 22-2 and a plurality of air permeable plates 22-3; a central pipe 22-2 is arranged in the center of the bin body 22-1 along the height direction, and a blowing opening is arranged at the bottom of the bin body 22-1 corresponding to the central pipe 22-2 and is connected with a fluidizing gas pipeline 24 through a blowing gas main pipeline 25; a plurality of air permeable plates 22-3 (shown in figure 3) are arranged at the lower part of the cabin body 22-1 along the circumferential direction, and the high-direction space of the cabin body 22-1 corresponding to each air permeable plate 22-3 is an air distribution chamber; the bottom of the bin body 22-1 corresponding to each air distribution chamber is respectively provided with a blowing opening which is connected with a fluidizing gas pipeline 24 through a corresponding blowing gas branch pipeline 26; the pneumatic homogenizing bin 22 is provided with a connector tube 28 capable of lifting right above the corresponding central tube 22-2, one end of the connector tube 28 in the pneumatic homogenizing bin 22 is used for connecting the central tube 22-2, and the other end of the connector tube 28 is connected with a storage barrel bin 30 through a homogenizing desulfurized ash conveying pipeline 29.
The main blowing gas pipeline 25 is provided with a check valve 31, and the branch blowing gas pipelines 26 are respectively provided with a valve 27.
The flue gas duct 6 is additionally connected to a chimney 14 via a standby duct 8.
The technical process of the coke oven flue gas desulfurization and denitrification system for fluidizing and homogenizing desulfurization ash is as follows:
1) the desulfurization, denitrification and dust removal process of the coke oven flue gas comprises the following steps:
after being led out from a combustion chamber 5 of the coke oven, the coke oven flue gas enters a flue gas desulfurization pipeline 7 through a flue gas pipeline 6; the desulfurizer adopts sodium bicarbonate; stored in SDS, after the desulfurizer in the powder bin 2 is metered by a feeding metering scale 3 according to a set amount, feeding the metered desulfurizer into a micro roller press 4, and grinding the desulfurizer to the particle size of less than 20 mu m; the finely ground desulfurizer forms two-phase flow gas with highly dispersed powder under the combined action of self gravity, mutual attraction and high-pressure air blown by the high-speed fan 1; after the two-phase flow gas and the coke oven gas are mixed, the sodium bicarbonate powder loses water under the heating action of the coke oven gas to become sodium carbonate powder with rich nano pores; the sodium carbonate powder and acid gas and oxygen in the coke oven gas are subjected to neutralization and oxidation reaction, mainly SO2Reaction to produce Na2SO4I.e. the mixed gas becomes Na-containing2SO4The two-phase flow gas of (2);
containing Na2SO4The two-phase flow gas enters a bag-type dust collector I9, the coke oven flue gas from which the hot desulfurization ash is removed enters an SCR denitration reactor 12 through a gas conveying pipeline I11 for denitration reaction, and the reaction process is as follows: 4NH3+4NO+O2→4N2+6H2O、4NH3+2NO2+O2→3N2+6H2O; the denitrated coke oven smoke is forcibly sucked into a chimney 14 by a strong fan 13 and then discharged into the atmosphere;
after dust on a cloth bag in the first cloth bag dust remover 9 is accumulated to limit resistance, ash removal operation is carried out, so that desulfurized ash on the cloth bag falls into an ash collecting hopper 10, and after the ash collecting hopper 10 is filled with desulfurized ash, the desulfurized ash is conveyed to an inclined spiral conveyor 18 through a first material guide chute 17 by a horizontal spiral conveyor 16 and then conveyed into a pneumatic homogenizing bin 22 through a second material guide chute 19;
2) gas fluidization homogenization process of desulfurized ash:
at the bottom of the pneumatic homogenizing silo 22, the high-pressure air blown by the roots blower 23 is divided into two parts: one part enters the central pipe 22-2 through a check valve 31 on the main blowing gas pipeline 25 and carries the desulfurized fly ash powder to move from bottom to top along the central pipe 22-2; the other part is used as fluidizing gas, and the total introduction amount of the fluidizing gas is T, and then the other part enters the pneumatic homogenizing silo 22 according to the following modes: introducing (1/n) multiplied by T fluidizing gas into n-1/n gas distribution chambers under the control of corresponding valves 27 to fluidize the desulfurization ash powder, wherein the corresponding gas distribution chambers are called combined gas distribution chambers; in addition, introducing (n-1/n) multiplied by T fluidized gas into 1/n gas distribution chambers to enable fluidized desulfurization ash powder to move upwards and to be in friction mixing with the desulfurization ash powder above the adjacent gas distribution chambers, wherein the corresponding gas distribution chambers are called independent gas distribution chambers; according to the mode, along the clockwise or anticlockwise direction, each air distribution chamber is sequentially used as an independent air distribution chamber, the other air distribution chambers are used as a combined air distribution chamber together, and fluidized gas with corresponding amount is introduced into the pneumatic homogenizing cabin 22;
in the gas fluidization homogenization process, redundant dust-containing gas is discharged from a gas outlet of the pneumatic homogenization bin 22 and enters the second bag-type dust remover 15 through the second gas conveying pipeline 20 for dust removal; the dedusted gas enters a gas conveying pipeline I11 through a gas conveying pipeline III 21, is merged with the SCR denitrated gas to be used as purified gas, and is discharged into the atmosphere through a chimney 14 under the action of a powerful fan 13;
3) storage process of homogenized desulfurized fly ash:
after the desulfurization ash powder in the pneumatic homogenization bin 22 is uniformly stirred, the connector pipe 28 falls down to be connected with the central pipe 22-2, and the homogenized desulfurization ash powder is conveyed to the storage barrel bin 30 through the homogenized desulfurization ash conveying pipeline 29; the high-pressure air blown by the roots blower 23 is divided into two parts: the first part is blown in from each branch pipe 26 of the blowing gas and enters each gas distribution chamber through the gas permeable plate 22-3, so that the dust close to the gas permeable plate 23 is fluidized; the other part is blown into the central pipe 22-2 through a main blowing gas pipe 25, fluidized dust is carried to move from bottom to top along the central pipe 22-2, and the fluidized dust is input into the storage barrel bin 30, so that the storage process of the homogenized desulfurized ash powder is completed.
The coke oven flue gas desulfurization and denitrification method for fluidizing and homogenizing desulfurized ash also comprises a centralized homogenizing process of the desulfurized ash; the method comprises the following specific steps:
the desulfurized ash after desulfurization and denitrification of the coke oven flue gas outside the system is sucked into a bulk tank truck from an ash collecting hopper of a desulfurized ash dust collector, the desulfurized ash is conveyed to a pneumatic homogenizing bin 22 by the bulk tank truck, a connector pipe 28 descends to be connected with a central pipe 22-2, then an outlet of the bulk tank truck is connected to a desulfurized ash inlet of the pneumatic homogenizing bin 22, the non-homogenized desulfurized ash in the bulk tank truck is added into the pneumatic homogenizing bin 22 through a pneumatic conveying system of the bulk tank truck, a fluidization homogenizing process is carried out through pneumatic stirring, and the homogenized desulfurized ash is conveyed to a storage barrel bin 30 according to the method in the process 3).
The following examples are carried out on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
As shown in fig. 1, in this embodiment, a system for desulfurization and denitrification of coke oven flue gas by fluidized homogenization of desulfurized ash comprises: (1) a desulfurizer storage and output unit; (2) a coke oven flue gas discharge duct system; (3) a desulfurizer and coke oven flue gas mixing system; (4) a hot desulfurized fly ash dedusting unit; (5) a connecting pipeline from the SCR denitration reactor and the self-heating desulfurization ash dust removal unit to the SCR denitration reactor; (6) a hot desulfurized fly ash conveying unit; (7) a pneumatic homogenizing bin; (8) a dust removal system behind the pneumatic homogenization bin; (9) a discharge system of the pneumatic homogenizing cabin. Wherein:
(1) and the desulfurizer storage and output unit is used for storing, pretreating and feeding the desulfurizer and comprises an SDS powder bin 2, a feeding metering scale 3 and a micro roller press 4.
(2) The coke oven flue gas exhaust pipeline system comprises: a coke oven combustion chamber 5, a flue gas pipeline 6, a flue gas desulfurization pipeline 7 and a standby pipeline 8.
(3) The mixing system of the desulfurizer and the coke oven flue gas comprises a high-speed fan 1 for fluidizing gas and solid.
(4) The hot desulfurization ash dust removal unit comprises 2 cloth bag dust removers I9, namely a 1# cloth bag dust remover and a 2# cloth bag dust remover in the figure 2, and the 2 cloth bag dust removers I9 alternately run.
(5) Connecting pipelines from the SCR denitration reactor and the self-heating desulfurization ash dust removal unit to the SCR denitration reactor: comprises a gas conveying pipeline I11 and an SCR denitration reactor 12.
(6) A hot desulfurized fly ash conveying unit: the device comprises a horizontal spiral conveyer 16, a first material guide chute 17, an inclined spiral conveyer 18 and a second material guide chute 19 which are arranged below a 1# bag-type dust remover, a 2# bag-type dust remover, a 3# bag-type dust remover and a 4# bag-type dust remover.
(7) As shown in fig. 2 and 3, the pneumatic homogenization silo 22 includes: the device comprises a bin body 22-1, a central pipe 22-2, four air-permeable plates 22-3 with equal size and corresponding air-charging chambers thereof, a main blowing gas pipeline 25, branch blowing gas pipelines 26 (only 2 are shown in figure 2), valves 27 (only 2 are shown in figure 2), a check valve 31, a fluidizing gas pipeline 24 and a Roots blower 23.
(8) The dust pelletizing system behind the air homogenization storehouse includes: 2 bag dust collectors II 15, namely a bag dust collector 3# and a bag dust collector 4# in the figure 2, wherein the bag dust collectors II 15 operate alternately; a second gas conveying pipeline 20, a third gas conveying pipeline 21, a powerful fan 13 and a chimney 14.
(9) The discharging system of the pneumatic homogenizing silo comprises a connector pipe 28, a homogenizing desulfurized ash output pipeline 29 and a storage barrel warehouse 30.
In this embodiment, a method for desulfurizing and denitrating coke oven flue gas by fluidizing and homogenizing desulfurized ash is specifically as follows:
firstly, the desulfurization, denitrification and dust removal process of the coke oven flue gas;
after being led out from a combustion chamber 5 of the coke oven, the coke oven flue gas enters a flue gas desulfurization pipeline 7 through a flue gas pipeline 6; the desulfurizer adopts sodium bicarbonate; the desulfurizer stored in the SDS powder bin 2 is measured by a feeding weigher 3 according to a set amount, and then is fed into a micro roller press 4 to be ground to a particle size below 20 mu m; the finely ground desulfurizer forms two-phase flow gas with highly dispersed powder under the combined action of self gravity, mutual attraction and high-pressure air blown by the high-speed fan 1; after the two-phase flow gas and the coke oven gas are mixed, the sodium bicarbonate powder loses water under the heating action of the coke oven gas to become sodium carbonate powder with rich nano pores; the sodium carbonate powder and acid gas and oxygen in the coke oven gas are subjected to neutralization and oxidation reaction, mainly SO2Reaction to produce Na2SO4I.e. the mixed gas becomes Na-containing2SO4The two-phase flow gas of (2);
containing Na2SO4The two-phase flow gas alternately enters a 1# bag dust collector or a 2# bagThe bag-type dust collector is characterized in that a bag is a high-temperature and chemical corrosion resistant glass fiber bag; the coke oven flue gas from which the thermal desulfurization ash is removed enters an SCR denitration reactor 12 through a gas conveying pipeline I11 to carry out denitration reaction, and the reaction process is as follows: 4NH3+4NO+O2→4N2+6H2O、4NH3+2NO2+O2→3N2+6H2O; the denitrated coke oven smoke is forcibly sucked into a chimney 14 by a strong fan 13 and then discharged into the atmosphere;
after dust on a cloth bag in the first cloth bag dust remover 9 is accumulated to limit resistance, ash removal operation is carried out, so that desulfurized ash on the cloth bag falls into an ash collecting hopper 10, and after the ash collecting hopper 10 is filled with desulfurized ash, the desulfurized ash is conveyed to an inclined spiral conveyor 18 through a first material guide chute 17 by a horizontal spiral conveyor 16 and then conveyed into a pneumatic homogenizing bin 22 through a second material guide chute 19;
(II) gas fluidization homogenization process of desulfurized fly ash:
at the bottom of the pneumatic homogenizing silo 22, the high-pressure air blown by the roots blower 23 is divided into two parts: one part enters the central pipe 22-2 through a check valve 31 on the main blowing gas pipeline 25 and carries the desulfurized fly ash powder to move from bottom to top along the central pipe 22-2; the other part is used as fluidizing gas, and the total introduction amount of the fluidizing gas is T, and then the other part enters the pneumatic homogenizing silo 22 according to the following modes: fluidizing desulfurized ash powder by introducing (1/4) T fluidizing gas into 3/4 gas distribution chambers under the control of corresponding valves 27; introducing (3/4) T fluidizing gas into 1/4 gas distribution chambers to enable fluidized desulfurization ash powder to move upwards and to be in friction mixing with desulfurization ash powder in adjacent gas distribution chambers; according to the mode, along the clockwise or anticlockwise direction, each air distribution chamber is sequentially used as an independent air distribution chamber, the other air distribution chambers are used as a combined air distribution chamber together, and fluidized gas with corresponding amount is introduced into the pneumatic homogenizing cabin 22;
in the gas fluidization homogenization process, redundant dust-containing gas is discharged from a gas outlet of the pneumatic homogenization bin 22 and enters the second bag-type dust remover 15 through the second gas conveying pipeline 20 for dust removal; the dedusted gas enters a gas conveying pipeline I11 through a gas conveying pipeline III 21, is merged with the SCR denitrated gas to be used as purified gas, and is discharged into the atmosphere through a chimney 14 under the action of a powerful fan 13;
(III) storage process of the homogenized desulfurized fly ash:
after the desulfurization ash powder in the pneumatic homogenization bin 22 is uniformly stirred, the connector pipe 28 falls down to be connected with the central pipe 22-2, and the homogenized desulfurization ash powder is conveyed to the storage barrel bin 30 through the homogenized desulfurization ash conveying pipeline 29; the high-pressure air blown by the roots blower 23 is divided into two parts: the first part is blown in from each branch pipe 26 of the blowing gas and enters each gas distribution chamber through the gas permeable plate 22-3, so that the dust close to the gas permeable plate 22-3 is fluidized; the other part is blown into the central pipe 22-2 through a main blowing gas pipe 25, fluidized dust is carried to move from bottom to top along the central pipe 22-2, and the fluidized dust is input into the storage barrel bin 30, so that the storage process of the homogenized desulfurized ash powder is completed.
The stored desulfurized fly ash has stable components and can be used as industrial anhydrous sodium sulphate raw materials or concrete early strength agents, antifreezing agents and the like.
(IV) centralized homogenization process of desulfurized fly ash:
the desulfurized ash after desulfurization and denitrification of the coke oven flue gas outside the system is sucked into a bulk tank car from an ash collecting hopper of a desulfurized ash dust collector, the desulfurized ash is conveyed to a pneumatic homogenizing bin 22 by the bulk tank car, a connector pipe 28 descends and is connected with a central pipe 22-2, then an outlet of the bulk tank car is connected to a desulfurized ash inlet of the pneumatic homogenizing bin 22, the non-homogenized desulfurized ash in the bulk tank car is added into the pneumatic homogenizing bin 22 through a pneumatic conveying system of the bulk tank car, a fluidizing process is carried out through pneumatic stirring, and the homogenized desulfurized ash is conveyed to a storage barrel bin 30 according to the method in the process 3) and is bagged or bulked for users.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (8)
1. A coke oven flue gas desulfurization and denitrification system for fluidized homogenized desulfurization ash is characterized by comprising a desulfurizer storage and output unit, a high-speed fan, a hot desulfurization ash dedusting unit, an SCR denitrification reactor, a hot desulfurization ash conveying unit, a pneumatic homogenizing cabin, a Roots fan, a dedusting unit, a powerful fan and a chimney;
the air outlet of the high-speed fan is connected with the flue gas inlet of the hot desulfurization ash dust removal unit through a flue gas desulfurization pipeline, and a desulfurizer spraying inlet and a flue gas inlet are sequentially arranged on the flue gas desulfurization pipeline along the gas flowing direction; the desulfurizer spraying port is connected with a desulfurizer storage and output unit; the flue gas inlet is connected with a flue gas pipeline led out from a combustion chamber of the coke oven;
an ash outlet of the thermal desulfurization ash dust removal unit is connected with a desulfurization ash inlet at the top of the pneumatic homogenization bin through a thermal desulfurization ash conveying unit, and a gas outlet of the thermal desulfurization ash dust removal unit is sequentially connected with the SCR denitration reactor, the strong fan and the chimney through a gas conveying pipeline I;
the bottom of the pneumatic homogenizing bin is provided with a plurality of blowing ports which are connected with a Roots blower through a fluidizing gas pipeline; the top of the pneumatic homogenizing bin is provided with a gas outlet which is connected with a gas inlet of the dust removal unit through a gas conveying pipeline II, and the gas outlet of the dust removal unit is connected with a gas conveying pipeline I at the downstream of the SCR denitration reactor through a gas conveying pipeline III.
2. The desulfurization and denitrification system for the fluidized and homogenized desulfurization ash coke oven flue gas as recited in claim 1, wherein the desulfurizer storage and output unit comprises an SDS powder bin, a feeding weigher and a micro roller press; the SDS powder bin is used for storing desulfurizer, the desulfurizer outlet at the bottom of the SDS powder bin is connected with a flue gas desulfurization pipeline through a desulfurizer output pipeline, and a feeding metering scale and a micro roller press are sequentially arranged on the desulfurizer output pipeline along the desulfurizer output direction.
3. The coke oven flue gas desulfurization and denitrification system for fluidized and homogenized desulfurization ash according to claim 1, wherein the thermal desulfurization ash dust removal unit comprises a first bag-type dust remover; 2 bag-type dust collectors are arranged side by side and run alternately; the cloth bag of the first cloth bag dust remover adopts a glass fiber bag.
4. The coke oven flue gas desulfurization and denitrification system for fluidized and homogenized desulfurization ash according to claim 1, wherein the dust removal unit comprises a second bag-type dust remover; 2 bag dust collectors are arranged side by side and run alternately.
5. The coke oven flue gas desulfurization and denitrification system for fluidized and homogenized desulfurized ash according to claim 1, wherein the hot desulfurized ash conveying unit comprises a horizontal screw conveyor, a first guide chute, an inclined screw conveyor and a second guide chute; the first bag-type dust collector and the second bag-type dust collector are arranged in parallel, the bottom of the first bag-type dust collector and the bottom of the second bag-type dust collector are respectively provided with an ash collecting hopper, and the bottom of the ash collecting hopper is provided with an ash outlet which is connected with a feed inlet of the horizontal spiral conveyor; the discharge port of the horizontal screw conveyer is connected with the feed inlet at the bottom of the inclined screw conveyer through a first guide chute, and the discharge port at the top of the inclined screw conveyer is connected with the desulfurized fly ash inlet at the top of the pneumatic homogenizing bin through a second guide chute.
6. The coke oven flue gas desulfurization and denitrification system for fluidized homogenized desulfurization ash according to claim 1, wherein the pneumatic homogenizing chamber is composed of a chamber body, a central pipe and a plurality of air permeable plates; a central pipe is arranged in the center of the bin body along the height direction, a blowing opening is arranged at the bottom of the bin body corresponding to the central pipe, and the blowing opening is connected with a fluidizing gas pipeline through a blowing gas main pipeline; a plurality of air permeable plates are arranged at the lower part of the bin body along the circumferential direction, and the height-direction space of the bin body corresponding to each air permeable plate is an air distribution chamber; the bottom of the bin body corresponding to each gas distribution chamber is respectively provided with a blowing port which is connected with a fluidizing gas pipeline through a corresponding blowing gas branch pipeline; the pneumatic homogenizing bin is provided with a connector pipe capable of lifting right above the corresponding central pipe, one end of the connector pipe in the pneumatic homogenizing bin is used for being connected with the central pipe, and the other end of the connector pipe is connected with the material storage barrel warehouse through a homogenizing desulfurized ash conveying pipeline.
7. The system of claim 6, wherein a check valve is disposed on the main injected gas pipeline, and valves are disposed on the branch injected gas pipelines.
8. The coke oven flue gas desulfurization and denitrification system with fluidized and homogenized desulfurization ash as claimed in claim 1, wherein the flue gas pipeline is additionally connected with a chimney through a spare pipeline.
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| CN112675681A (en) * | 2020-12-15 | 2021-04-20 | 鞍钢集团工程技术有限公司 | Coke oven flue gas desulfurization and denitrification system and method for fluidizing and homogenizing desulfurized ash |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112675681A (en) * | 2020-12-15 | 2021-04-20 | 鞍钢集团工程技术有限公司 | Coke oven flue gas desulfurization and denitrification system and method for fluidizing and homogenizing desulfurized ash |
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