CN113813778A - Method and equipment for flue gas desulfurization and denitration by using active coke-supported metal oxide - Google Patents
Method and equipment for flue gas desulfurization and denitration by using active coke-supported metal oxide Download PDFInfo
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- CN113813778A CN113813778A CN202110966824.4A CN202110966824A CN113813778A CN 113813778 A CN113813778 A CN 113813778A CN 202110966824 A CN202110966824 A CN 202110966824A CN 113813778 A CN113813778 A CN 113813778A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
- B01D53/8609—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/38—Nitric acid
- C01B21/42—Preparation from nitrates
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Abstract
The invention discloses a method for using active coke-supported metal oxide for flue gas desulfurization and denitrification, which comprises the following steps: s1, spraying a nitric acid metal compound solution; s2, conveying the active coke to contact with the nitric acid metal compound solution; s3, treating the active coke contacted with the nitric acid metal compound at a preset temperature to realize the loading of the active coke on the metal oxide; s4, splitting the active coke loaded with the metal oxide to form a first active coke and a second active coke; s5, contacting the first active coke with the flue gas to remove oxysulfide from the flue gas, so as to form desulfurized flue gas; and S6, mixing the desulfurized flue gas with ammonia gas which is input in advance, and contacting the desulfurized flue gas with the second active coke to remove nitric oxides from the desulfurized flue gas so as to form desulfurized and denitrated flue gas. The method can effectively purify the flue gas without generating any pollutant.
Description
Technical Field
The invention belongs to the technical field of dry desulfurization and denitration, and particularly relates to a method and equipment for desulfurization and denitration of flue gas by using active coke-supported metal oxide.
Background
With the enhancement of the environmental awareness of people and the stricter national environmental regulations and policies, many enterprises which can generate polluting gases in the production process can carry out desulfurization and denitrification treatment on the flue gas of the enterprises so as to meet the requirement of environmental protection.
There are three commonly used desulfurization methods at present, wet desulfurization, semi-dry desulfurization and dry desulfurization. Wherein, wet flue gas desulfurization and semi-dry flue gas desulfurization need consume a large amount of water resources, produce a large amount of waste water, still can make flue gas water content greatly increased, and the atmospheric discharge can aggravate the worsening of haze. Therefore, many enterprises do not use the two desulfurization and denitrification methods any more, and preferentially adopt the dry desulfurization technology.
The active coke desulfurization is an environment-friendly dry desulfurization technology. However, for the flue gas purification process with high sulfur content, the desulfurization and denitrification activity of the pure active coke is rapidly reduced along with the increase of the regeneration times, so that the desulfurization and denitrification efficiency is also reduced, and the strict environmental protection requirements cannot be met. However, after the active coke is loaded with the metal oxide, the metal oxide can oxidize sulfur dioxide into sulfuric acid and can be reduced into a metal simple substance in the adsorption reaction process. The metal simple substance can be oxidized into metal oxide on the active coke, thereby completing the catalytic cycle and forming the active coke adsorption catalyst with higher activity.
The active coke can be used for desulfurization of flue gas, can accelerate the reaction process of nitrogen oxides, has good catalytic action, and ensures that nitrogen oxides such as nitric oxide, nitrogen dioxide and the like react with oxygen and ammonia gas to produce nitrogen and water, thereby completing the denitration process of the flue gas.
In the prior art, two methods for loading metal oxide on active coke are mainly used, namely an impregnation method and a blending method. The dipping method is that the surface of the formed pure active coke product is wetted by metal solution, the water is removed by high temperature and the metal ions are oxidized into metal oxide to be loaded on the surface layer of the active coke; the blending method is to mix the metal oxide into the active coke during the forming process of the active coke, so that the metal oxide can be uniformly distributed in the active coke. The two methods have the following problems in industrial application: firstly, the active coke needs to be subjected to high-temperature activation treatment (over 1000 ℃) in the forming process, and at the temperature, the active coke with strong reducibility is easy to generate oxidation-reduction reaction with metal oxide, so that the valence of the metal oxide is reduced, and then the low-valence metal oxide is sublimated, and the metal oxide/active coke product with set quality is difficult to obtain. Secondly, the adoption of the active coke circulation dipping metal solution method can cause the metal solution to become acid, and finally waste water which is difficult to recycle and purify is generated, which is contrary to the aim of the dry desulphurization technology.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a method for using an active coke-supported metal oxide for flue gas desulfurization and denitrification, which comprises the following steps:
s1, spraying a nitric acid metal compound solution;
s2, conveying the active coke to contact with the nitric acid metal compound solution;
s3, treating the activated coke at a preset temperature;
s4, splitting the active coke loaded with the metal oxide to form a first active coke and a second active coke;
s5, contacting the first active coke with the flue gas to remove oxysulfide from the flue gas, so as to form desulfurized flue gas;
and S6, mixing the desulfurized flue gas with ammonia gas which is input in advance, and then contacting the desulfurized flue gas with the second active coke to remove nitric oxides from the desulfurized flue gas so as to form the desulfurized and denitrated flue gas.
Further, the method further comprises: s0, mixing and stirring the nitric acid metal oxide solid and the deionized water to fully dissolve the nitric acid metal oxide solid to form a nitric acid metal compound solution, and turning to the step S1.
Further, the method further comprises: and S7, performing dust removal treatment on the desulfurization and denitrification flue gas obtained in the step S6 to form clean flue gas, and discharging the clean flue gas to the atmosphere.
Further, the step S2 further includes the steps of conveying the activated coke to contact with the sprayed nitric acid metal compound solution in a timed and quantitative manner;
step S5 further includes contacting the first activated coke with the flue gas to remove sulfur oxides from the flue gas, thereby forming a desulfurized flue gas and a first regenerated activated coke;
step S6 further includes mixing the flue gas with ammonia gas, and contacting the flue gas with second activated coke to remove nitrogen oxides from the flue gas, thereby forming a flue gas and a second regenerated activated coke.
Further, the method further comprises:
s8, judging whether the flue gas desulfurization and denitrification efficiency reaches a preset value, if so, turning to the step S9, otherwise, turning to the step S10;
s9, transferring the first regenerated active coke in the step S5 and the second regenerated active coke in the step S6 to perform the step S3;
s10, burning the first regenerated active coke in the step S5 and the second regenerated active coke in the step S6 as fuel;
s11, preparing sulfuric acid and nitric acid from the sulfur oxides and nitrogen oxides produced in step 3.
The invention also provides equipment for flue gas desulfurization and denitrification by using the active coke-supported metal oxide, which comprises the following components:
the spraying device is used for spraying a nitric acid metal compound solution;
the transportation device is used for conveying the active coke to the spraying device to be contacted with the nitric acid metal compound solution;
the regeneration device is connected with the spraying device and is used for treating the active coke at a preset temperature;
a flow dividing device for dividing the active coke loaded with the metal oxide to form a first active coke and a second active coke;
the desulfurization device is used for contacting the first active coke with the flue gas to remove oxysulfide from the flue gas so as to form desulfurized flue gas;
and the denitration device is used for mixing the desulfurized flue gas with the ammonia gas which is input in advance and then contacting the desulfurized flue gas with the second active coke to remove nitric oxides from the desulfurized flue gas so as to form the desulfurized and denitrated flue gas.
Further, the apparatus further comprises:
the storage device is connected with the transportation device and is used for storing the active coke;
the dissolving device is used for mixing and stirring the nitric acid metal oxide solid and the deionized water to fully dissolve the nitric acid metal oxide solid and the deionized water to form a nitric acid metal compound solution, and conveying the nitric acid metal compound solution to the spraying device;
the ammonia gas injection device is positioned between the desulfurization device and the denitrification device and is used for inputting ammonia gas so as to be mixed with the desulfurization flue gas;
and the dust removal device is used for carrying out dust removal treatment on the desulfurization and denitrification flue gas generated by the denitrification device to form clean flue gas which is discharged to the atmosphere.
Further, the dissolving device comprises a dissolving tank, a stirrer and a liquid storage tank.
Further, the desulfurization device is also used for contacting the first active coke with the flue gas to remove oxysulfide from the flue gas, so as to form desulfurized flue gas and first regenerated active coke;
the denitration device is also used for mixing the desulfurized flue gas with ammonia gas and contacting with second active coke to remove nitric oxides from the desulfurized flue gas so as to form desulfurized and denitrated flue gas and second regenerated active coke;
the spraying device comprises a spraying chamber and a spray head, and is further used for spraying the nitric acid metal compound solution into the spraying chamber through the spray head;
the transportation device comprises a star-shaped feeding valve and a transportation tool, and is further used for conveying the active coke to the spray chamber in a timing and quantitative mode to be in contact with the nitric acid metal compound solution.
Further, the apparatus further comprises:
the circulating device is used for judging whether the flue gas desulfurization and denitrification efficiency reaches a preset value, and if so, conveying the first regenerated active coke and the second regenerated active coke to the regenerating device; otherwise, the first regenerated active coke and the second regenerated active coke are used as fuel;
and the acid making device is used for making the sulfur oxides and the nitrogen oxides formed in the regeneration device into sulfuric acid and nitric acid.
The active coke-supported manganese dioxide is used for removing sulfur oxides and nitrogen oxides in the flue gas, and the technical scheme can effectively purify the flue gas without generating any pollution.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for desulfurization and denitrification of flue gas, which uses metal oxide supported by active coke;
FIG. 2 is a schematic flow chart of a method for desulfurization and denitrification of flue gas by using metal oxide supported by active coke;
FIG. 3 is a schematic structural diagram of another activated coke-supported metal oxide apparatus for desulfurization and denitrification of flue gas provided by the invention;
FIG. 4 is a schematic flow chart of another method for desulfurization and denitrification of flue gas by using active coke-loaded metal oxide provided by the invention;
FIG. 5 is a schematic diagram of an apparatus for desulfurization and denitrification of flue gas, in which the metal oxide supported by active coke is provided by the present invention.
Detailed Description
The invention provides a method and equipment for using active coke-supported metal oxide for flue gas desulfurization and denitrification, which are used for removing sulfur oxide and nitrogen oxide in flue gas and do not produce any pollutant. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Next, the present invention will be described in detail with reference to the drawings, and in the detailed description of the embodiments of the present invention, the cross-sectional views illustrating the structure of the device are not enlarged partially according to the general scale for convenience of illustration, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
The invention provides a method and equipment for using active coke-supported metal oxide for flue gas desulfurization and denitrification, which are used for removing sulfur oxide and nitrogen oxide in flue gas and do not produce any pollutant. Referring to fig. 1, in a preferred embodiment, the present invention provides an apparatus for desulfurization and denitrification of flue gas by using metal oxide supported on activated coke, the apparatus comprising: spray set, conveyer, regenerating unit, diverging device, desulphurization unit and denitrification facility. Referring to fig. 2, the method provided by the present invention includes the following steps:
step 101, spraying a nitric acid metal compound solution by a spraying device;
102, conveying the active coke to a spraying device by a conveying device to contact with the nitric acid metal compound solution;
103, treating the active coke at a preset temperature by the regeneration device;
104, shunting the active coke loaded with the metal oxide by using a shunting device to form first active coke and second active coke;
step 105, enabling the first active coke to contact with the flue gas by a desulfurization device, so that sulfur oxides in the flue gas are removed to form desulfurized flue gas;
and 106, mixing the desulfurized flue gas with ammonia gas which is input in advance by a denitration device, and contacting the desulfurized flue gas with the second active coke to remove nitric oxides from the desulfurized flue gas so as to form the desulfurized and denitrated flue gas.
The invention can contact the active coke with the sprayed nitric acid metal compound solution, and then carry out high-temperature treatment to obtain the active coke loaded with metal oxides, and then remove sulfur oxides and nitrogen oxides in the flue gas by the active coke loaded with the metal oxides. The invention has high desulfurization and denitrification efficiency, does not generate any pollutant in the process of purifying the flue gas, and greatly meets the requirement of environmental protection.
Example two
The invention provides a method and equipment for using active coke-supported metal oxide for flue gas desulfurization and denitrification, which are used for removing sulfur oxide and nitrogen oxide in flue gas and do not produce any pollutant. Referring to fig. 3, in a preferred embodiment, the present invention provides an apparatus for desulfurization and denitrification of flue gas by using metal oxide supported on activated coke, which comprises: dissolving device, spray set, conveyer, regenerating unit, diverging device, desulphurization unit, denitrification facility, ammonia injection apparatus, dust collector, system acid device and circulating device. Referring to fig. 4, the method provided by the present invention includes the following steps:
step 201, mixing and stirring a nitric acid metal oxide solid and deionized water in a dissolving device to fully dissolve the nitric acid metal oxide solid and the deionized water to form a nitric acid metal compound solution, and conveying the nitric acid metal compound solution to a spraying device.
As shown in FIG. 5, the dissolving apparatus herein includes a dissolving tank 2, a stirrer (not shown), and a reservoir 3. In a preferred embodiment, the nitric acid metal oxide is manganese nitrate. Specifically, solid manganese nitrate and deionized water are added into a manganese nitrate dissolving tank 2 together, the manganese nitrate is sufficiently dissolved by acceleration under the action of a stirrer, an outlet at the bottom of the manganese nitrate dissolving tank 2 is connected to a liquid storage tank 3, and a dissolved manganese nitrate solution flows into the liquid storage tank 3 and then is pumped into a spraying device through a pump (4).
Step 202, spraying a nitric acid metal compound solution by a spraying device.
The spraying device here comprises a spray chamber 5 and a shower head (not shown in the figure). In step 201, the manganese nitrate solution pumped into the spraying device by the pump 4 is sprayed in the spraying chamber 5 through the spraying head.
And step 203, conveying the active coke to contact with the nitric acid metal compound solution by a conveying device.
The transport means referred to herein comprise a star-shaped feed valve and a transport vehicle. In a preferred embodiment, the transportation device delivers the activated coke to the spray chamber 5 in a timed and quantitative manner to contact with the manganese nitrate solution.
In actual use, the illustrated transporter is connected to a bin. The storage device, namely the active coke storage bin 1, is used for storing active coke. During the use, the conveyer is through star feed valve and transport means with the timely quantitative transport of the active coke in the active coke warehouse 1 to spray room 5.
And 204, treating the active coke contacted with the nitric acid metal compound by the regeneration device at a preset temperature to realize the loading of the active coke on the metal oxide.
As can be seen from the above, the transportation means transports the activated coke to the spray chamber 5 to be in contact with the manganese nitrate solution sprayed in the spray chamber 5. The activated coke contacted with the manganese nitrate solution comes out from the bottom of the spray chamber 5 and enters a regeneration device, namely a regeneration tower 6. And (3) treating at a preset temperature in a regeneration tower to realize the loading of the metal oxide by the active coke. Specifically, after the active coke contacted with the manganese nitrate solution enters a regeneration tower (6), the manganese nitrate is decomposed into manganese dioxide and nitrogen dioxide at the high temperature of 400-500 ℃, wherein the manganese dioxide is absorbed in the active coke, so that the manganese dioxide is supported by the active coke. And compared with pure active coke, the active coke loaded with manganese dioxide has higher desulfurization and denitrification efficiency, better regeneration performance and longer service life.
The preset temperature is usually a high temperature of 400-500 ℃, and the temperature range can better obtain metal oxide/active coke products with set quality compared with the prior art that high temperature of more than 1000 ℃ is used for processing, thereby ensuring the efficiency of desulfurization and denitrification.
Step 205, the active coke loaded with metal oxide is divided by a dividing device to form a first active coke and a second active coke;
the active coke loaded with metal oxides and coming out of the regenerating device is divided into two parts, namely a first active coke and a second active coke, by a dividing device. In general, the split-flow device is a split-flow pipe, active coke loaded with manganese dioxide enters an inlet of the split-flow pipe from an outlet at the lower part of the regeneration tower 6, and the split-flow pipe is divided into two parts to form two outlets. After entering the inlet of the shunt tube, the active coke loaded with manganese dioxide is also split into two parts to form a first active coke and a second active coke, and the first active coke and the second active coke respectively exit from two outlets of the shunt tube. Two outlets of the shunt pipe are connected with a desulfurization device and a denitrification device, and the details are explained later.
Step 206, enabling the first active coke to enter a desulfurization device and contact with flue gas, so that sulfur oxides in the flue gas are removed, and forming desulfurized flue gas and first regenerated active coke;
and step 207, mixing the denitration of the desulfurization flue gas with the ammonia gas input in advance, enabling the mixture to enter a denitration device and contact with the second active coke, and removing nitrogen oxides from the desulfurization flue gas to form the desulfurization and denitration flue gas and the second regenerated active coke.
As can be seen from step 205, the active coke supporting manganese dioxide is split into two parts, one part is the first active coke, and enters the desulfurization device, i.e., the desulfurization tower 7, through an outlet of the splitting device connected to the desulfurization device; the other part is second active coke which enters the denitration device through another outlet connected with the denitration device on the flow dividing device. When carrying out SOx/NOx control to the flue gas and handling, let the flue gas that needs purify get into desulphurization unit, also be exactly desulfurizing tower 7, contact with first active burnt wherein, the desorption oxysulfide, then go out through the gas outlet of desulfurizing tower 7.
In general, the denitration device further comprises a pipeline connected between the desulfurization device and the denitration device, and ammonia gas is continuously input into the pipeline so as to be mixed with the desulfurization flue gas from the desulfurization device for subsequent denitration treatment. The ammonia gas is usually supplied from an ammonia gas injection device located between the desulfurization device and the denitration device.
The desulfurization flue gas of desorption oxysulfide comes out through the gas outlet of desulfurizing tower 7, mixes with the ammonia, later gets into denitrification facility jointly, also is denitration tower 8, carries out denitration treatment.
Because the chemical reaction process of flue gas desulfurization denitration belongs to prior art, so no longer give unnecessary details here. The first regenerated active coke and the second regenerated active coke generated in step 206 and step 207 enter a regeneration device for regeneration, and the specific process will be described below.
208, judging whether the flue gas desulfurization and denitrification efficiency reaches a preset value by the circulating device, if so, conveying the first modified active coke and the second modified active coke to the regenerating device, and turning to 203; and otherwise, taking the first regenerated active coke and the second regenerated active coke as fuel.
Since the manganese dioxide-loaded activated coke coming out of the desulfurization apparatus and the denitration apparatus adsorbs sulfuric acid, the adsorption force is weakened or lost, and it is necessary to enter a regeneration apparatus for regeneration in order to recover the adsorption force in the period. However, after the modified activated coke is regenerated for several times (about 8 times), the desulfurization and denitrification efficiency of the modified activated coke is difficult to meet the environmental protection requirement (namely, the modified activated coke fails), so that before the modified activated coke enters the cyclic regeneration, whether the desulfurization and denitrification efficiency of the flue gas reaches a preset value or not needs to be judged, namely whether the desulfurization and denitrification efficiency of the flue gas reaches the environmental protection requirement or not needs to be judged. If the desulfurization and denitrification efficiency meets the environmental protection requirement, the first regenerated active coke and the second regenerated active coke are conveyed to a conveying device, and are conveyed into a spray chamber 5 to be contacted with the sprayed manganese nitrate solution again, and then enter a regeneration tower 6. And if the desulfurization and denitrification efficiency does not meet the environmental protection requirement, indicating that the first regenerated active coke and the second regenerated active coke are invalid, and feeding the first regenerated active coke and the second regenerated active coke into a combustion furnace as fuels.
And step 209, the acid making device prepares the sulfur oxides and the nitrogen oxides formed in the regeneration device into sulfuric acid and nitric acid together.
Specifically, SO desorbed from the regeneration tower 62And NO decomposed by manganese nitrate2The sulfuric acid and the nitric acid are jointly fed into an acid making device to prepare the sulfuric acid and the nitric acid, and the preparation process is prior art and is not described herein again.
As can be seen from the above, the activated coke passes through steps 208 and 209, thereby completing a regeneration cycle.
And step 210, performing dust removal treatment on the desulfurization and denitrification flue gas generated by the denitrification device by using the dust removal device to form clean flue gas, and discharging the clean flue gas to the atmosphere.
In general, flue gas enters a dust removal device from an outlet of a denitration tower 8 after being subjected to desulfurization and denitration treatment, namely, a bag-type dust remover 9 is subjected to dust removal treatment, and finally, purified flue gas is sent to a chimney 12 and is discharged to the atmosphere.
The embodiments described herein are merely preferred versions that are specific to the invention. In the text, the active coke supports manganese dioxide, preferably metal oxide, but the active coke is modified by ferric oxide and chromium oxide, the adsorption rate is also provided, but the effect is not good as that of manganese dioxide; the preferred metal oxide solution is manganese nitrate solution, because it has been explained above that manganese dioxide is preferred, and manganese sulfate solution has too high a decomposition temperature, so the preferred solution is manganese nitrate solution. It will be understood that the foregoing is only preferred and that various modifications, additions and substitutions may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
The present invention is not limited to the above preferred embodiments, but rather, 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. A method for using active coke-supported metal oxide for flue gas desulfurization and denitration is characterized by comprising the following steps:
s1, spraying a nitric acid metal compound solution;
s2, conveying the active coke to contact with the nitric acid metal compound solution;
s3, treating the activated coke at a preset temperature;
s4, splitting the active coke loaded with the metal oxide to form a first active coke and a second active coke;
s5, contacting the first active coke with the flue gas to remove oxysulfide from the flue gas, so as to form desulfurized flue gas;
and S6, mixing the desulfurized flue gas with ammonia gas which is input in advance, and then contacting the desulfurized flue gas with the second active coke to remove nitric oxides from the desulfurized flue gas so as to form the desulfurized and denitrated flue gas.
2. The method of claim 1, further comprising:
s0, mixing and stirring the nitric acid metal oxide solid and the deionized water to fully dissolve the nitric acid metal oxide solid to form a nitric acid metal compound solution, and turning to the step S1.
3. The method of claim 1, further comprising:
and S7, performing dust removal treatment on the desulfurization and denitrification flue gas obtained in the step S6 to form clean flue gas, and discharging the clean flue gas to the atmosphere.
4. The method of claim 1, further comprising:
the step S2 further comprises the steps of conveying the active coke to contact with the sprayed nitric acid metal compound solution in a timed and quantitative mode;
step S5 further includes contacting the first activated coke with the flue gas to remove sulfur oxides from the flue gas, thereby forming a desulfurized flue gas and a first regenerated activated coke;
step S6 further includes mixing the flue gas with ammonia gas, and contacting the flue gas with second activated coke to remove nitrogen oxides from the flue gas, thereby forming a flue gas and a second regenerated activated coke.
5. The method of claim 4, further comprising:
s8, judging whether the flue gas desulfurization and denitrification efficiency reaches a preset value, if so, turning to the step S9, otherwise, turning to the step S10;
s9, transferring the first regenerated active coke in the step S5 and the second regenerated active coke in the step S6 to perform the step S3;
s10, burning the first regenerated active coke in the step S5 and the second regenerated active coke in the step S6 as fuel;
s11, preparing sulfuric acid and nitric acid from the sulfur oxides and nitrogen oxides produced in step 3.
6. An equipment for flue gas desulfurization and denitration by using metal oxide supported by active coke is characterized by comprising:
the spraying device is used for spraying a nitric acid metal compound solution;
the transportation device is used for conveying the active coke to the spraying device to be contacted with the nitric acid metal compound solution;
the regeneration device is connected with the spraying device and is used for treating the active coke at a preset temperature;
the shunting device is used for shunting the active coke loaded with the metal oxide to form first active coke and second active coke;
the desulfurization device is used for contacting the first active coke with the flue gas to remove oxysulfide from the flue gas so as to form desulfurized flue gas;
and the denitration device is used for mixing the desulfurized flue gas with the ammonia gas which is input in advance and then contacting the desulfurized flue gas with the second active coke to remove nitric oxides from the desulfurized flue gas so as to form the desulfurized and denitrated flue gas.
7. The apparatus of claim 6, further comprising:
the storage device is connected with the transportation device and is used for storing the active coke;
the dissolving device is used for mixing and stirring the nitric acid metal oxide solid and the deionized water to fully dissolve the nitric acid metal oxide solid and the deionized water to form a nitric acid metal compound solution, and conveying the nitric acid metal compound solution to the spraying device;
the ammonia gas injection device is positioned between the desulfurization device and the denitrification device and is used for inputting ammonia gas so as to be mixed with the desulfurization flue gas;
and the dust removal device is used for carrying out dust removal treatment on the desulfurization and denitrification flue gas generated by the denitrification device to form clean flue gas which is discharged to the atmosphere.
8. The apparatus of claim 7, wherein the dissolution device comprises a dissolution tank, a blender, and a reservoir.
9. The apparatus of claim 6, wherein:
the desulfurization device is also used for contacting the first active coke with the flue gas to remove oxysulfide from the flue gas so as to form desulfurized flue gas and first regenerated active coke;
the denitration device is also used for mixing the desulfurized flue gas with ammonia gas and contacting with second active coke to remove nitric oxides from the desulfurized flue gas so as to form desulfurized and denitrated flue gas and second regenerated active coke;
the spraying device comprises a spraying chamber and a spray head, and the spraying device is further used for spraying the nitric acid metal compound solution into the spraying chamber through the spray head.
The transportation device comprises a star-shaped feeding valve and a transportation tool, and is further used for conveying the active coke to the spray chamber in a timing and quantitative mode to be in contact with the nitric acid metal compound solution.
10. The apparatus of claim 6, further comprising:
the circulating device is used for judging whether the flue gas desulfurization and denitrification efficiency reaches a preset value, and if so, conveying the first regenerated active coke and the second regenerated active coke to the regenerating device; otherwise, the first regenerated active coke and the second regenerated active coke are used as fuel;
and the acid making device is used for making the sulfur oxides and the nitrogen oxides formed in the regeneration device into sulfuric acid and nitric acid.
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| CN104525116A (en) * | 2014-12-31 | 2015-04-22 | 上海克硫环保科技股份有限公司 | Desulfurization and denitrification modified active coke and preparation method thereof |
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| CN104525116A (en) * | 2014-12-31 | 2015-04-22 | 上海克硫环保科技股份有限公司 | Desulfurization and denitrification modified active coke and preparation method thereof |
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