CN112827512A - Desulfurization and denitrification agent and preparation method thereof - Google Patents
Desulfurization and denitrification agent and preparation method thereof Download PDFInfo
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- CN112827512A CN112827512A CN202011570792.8A CN202011570792A CN112827512A CN 112827512 A CN112827512 A CN 112827512A CN 202011570792 A CN202011570792 A CN 202011570792A CN 112827512 A CN112827512 A CN 112827512A
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 44
- 230000023556 desulfurization Effects 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims description 16
- 239000003245 coal Substances 0.000 claims abstract description 34
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 33
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 25
- 239000000571 coke Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 25
- 239000003463 adsorbent Substances 0.000 claims description 23
- 238000001994 activation Methods 0.000 claims description 18
- 238000003763 carbonization Methods 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 16
- 238000002309 gasification Methods 0.000 claims description 12
- 239000011265 semifinished product Substances 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 230000004913 activation Effects 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 230000003213 activating effect Effects 0.000 claims description 6
- 238000010000 carbonizing Methods 0.000 claims description 6
- 238000007598 dipping method Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 6
- 239000003077 lignite Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 238000000197 pyrolysis Methods 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims 1
- 238000004064 recycling Methods 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 abstract description 16
- 239000003546 flue gas Substances 0.000 abstract description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 8
- 230000003647 oxidation Effects 0.000 abstract description 8
- 238000007254 oxidation reaction Methods 0.000 abstract description 8
- 230000003197 catalytic effect Effects 0.000 abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 5
- 239000011230 binding agent Substances 0.000 abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 abstract description 5
- 239000001301 oxygen Substances 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 10
- 239000003570 air Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 2
- 229910052815 sulfur oxide Inorganic materials 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Inorganic materials O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- B01J35/56—
-
- 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
-
- 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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/745—Iron
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
- B01J37/0207—Pretreatment of the support
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
- B01J37/084—Decomposition of carbon-containing compounds into carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention relates to the technical field of flue gas treatment, and discloses a desulfurization and denitrification agent which comprises the following raw materials in parts by weight: 10-15 parts of binder for raw coal,5-8 parts of dilute nitric acid 8-13 parts and 10-15 parts of ferric nitrate. Surface of desulfurization and denitrification agent to SO2Has the functions of adsorption and catalytic oxidation, and when no oxygen and water vapor exist in the flue gas, the active coke adsorbs SO2The adsorption capacity is small only by physical adsorption, and when oxygen and water vapor exist in the flue gas, chemical adsorption is also generated in addition to physical adsorption, and adsorbed SO2Under the catalytic oxidation of active coke with O in flue gas2Reaction to form SO3Then the reaction with water vapor to produce sulfuric acid, so as to greatly increase the adsorption capacity.
Description
Technical Field
The invention relates to the technical field of flue gas treatment, in particular to a desulfurization and denitrification agent and a preparation method thereof.
Background
SO discharged from coal combustion2And NOxIs a main atmospheric pollutant and is a main source causing acid rain and photochemical smog, and for years, the nation has paid great attention to the treatment of SO2 and NOx, along with NOXThe control standard is becoming more and more strict, and the desulfurization and denitrification technology is receiving increasing attention from various countries.
The flue gas desulfurization and denitration technology is a boiler flue gas purification technology applied to the chemical industry of generating multi-nitrogen oxides and sulfur oxides. Nitrogen oxides and sulfur oxides are one of the main sources of air pollution. The application of this technology is of considerable benefit for ambient air purification. Known flue gas desulfurization and denitrification technologies include the technologies of PAFP, ACFP, pyrolusite method, electron beam ammonia method, pulse corona method, gypsum wet method, catalytic oxidation method, microbial degradation method and the like.
At present, wet flue gas desulfurization and catalytic reduction denitration are two most common technologies for industrial application, but the technology has high investment cost and great operation difficulty, so that the popularization and the use of the technology in China are limited, and the development of a high-efficiency and low-cost desulfurization and denitration technology is urgently needed, so that a desulfurization and denitration agent and a preparation method thereof are provided.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a desulfurization and denitrification agent and a preparation method thereof.
The invention provides the following technical scheme: a desulfurization and denitrification agent comprises the following raw materials in parts by weight:
10-15 parts of raw coal
5-8 parts of adhesive
8-13 parts of dilute nitric acid
10-15 parts of ferric nitrate
Preferably, the desulfurization and denitrification agent comprises the following raw materials in parts by weight:
raw coal 10 parts
5 parts of adhesive
Dilute nitric acid 8 portions
10 portions of ferric nitrate
Preferably, the desulfurization and denitrification agent comprises the following raw materials in parts by weight:
raw coal 12 parts
6 parts of adhesive
10 portions of dilute nitric acid
12 parts of ferric nitrate
Preferably, the desulfurization and denitrification agent comprises the following raw materials in parts by weight:
raw coal 15 parts
8 parts of adhesive
Dilute nitric acid 13 portions
15 parts of ferric nitrate
A preparation method of a desulfurization and denitrification agent comprises the following specific steps:
s1, crushing and screening raw coal, then feeding the raw coal into a fluidized bed mild gasification lignite upgrading reactor, fluidizing the raw coal in the upgrading reactor by hot air, performing mild gasification, combustion and dry distillation reactions in the reactor, controlling the temperature in the reactor within a proper range, and finally discharging the raw material;
s2, adding an adhesive into the processed raw coal after a powder making process, performing an extrusion molding process, drying, carbonizing and activating the dried raw material, and cooling to obtain activated coke;
s3, putting the activated coke into a three-neck round-bottom flask, adding diluted nitric acid solution, carrying out reflux treatment at constant temperature of 85 ℃ for 2h, taking out a sample, washing with water until the pH value is greater than 6, drying at 120 ℃ for 12h, putting the sample into a tubular stainless steel reactor, keeping the temperature of 700 ℃ for 2h under the protection of nitrogen, and cooling to room temperature to obtain a semi-finished product;
and S4, dipping the semi-finished product into ferric nitrate solution with a certain concentration, standing at room temperature for 2h, taking out, drying at 110 ℃ for 12h, keeping the temperature at 700 ℃ for 2h under the protection of nitrogen, and cooling to room temperature to obtain the adsorbent.
Preferably, in the carbonization process of S2, the carbonization temperature of the carbonization furnace is 450-550 ℃.
Preferably, in the activation process of S2, a steam activation process is adopted, and the activation temperature is controlled at 750-950 ℃.
Preferably, the adsorbent obtained in S4 is put into water after being used, stirred for 30 minutes and put into a stainless steel reactor, the temperature is raised to 700 ℃ under the condition of the nitrogen flow rate of 100mL/min, the temperature is kept for 2 hours, and the adsorbent is taken out after being cooled to room temperature, so that the adsorbent can be recycled.
Compared with the prior art, the desulfurization and denitrification agent and the preparation method thereof have the following beneficial effects:
surface of desulfurization and denitrification agent to SO2Has the functions of adsorption and catalytic oxidation, and when no oxygen and water vapor exist in the flue gas, the active coke adsorbs SO2The adsorption capacity is small only by physical adsorption, and when oxygen and water vapor exist in the flue gas, chemical adsorption is also generated in addition to physical adsorption, and adsorbed SO2Under the catalytic oxidation of active coke with O in flue gas2Reaction to form SO3Then the sulfuric acid reacts with water vapor to generate sulfuric acid, so that the adsorption capacity of the sulfuric acid is greatly increased;
surface of desulfurization and denitrification agent to NOXHas adsorption and catalytic oxidation effects, and can be used for adsorbing NO by adding ammonia into active coke adsorption desulfurization systemXReacts with NH to effectively react with NOXThe cleaning is carried out, and the cleaning is carried out,
fe is loaded in pores of desulfurization and denitrification agent2O3Can further improve the desulfurization activity of the adsorbent, and the active coke can remove ash in the active coke after modification treatment to form rich woven mesh structure, improve the surface property of the active coke and be beneficial to SO2Adsorption and oxidation on the surface of the semicoke, supported metal oxides, on the one hand, capable of promoting SO2On the other hand with SO2Interaction can also occur, and a certain sulfur fixing effect is achieved;
in addition, after the active coke is modified, the specific surface area is increased, oxygen-containing functional groups and basic functional groups on the surface are increased, the adsorption and oxidation conversion of gas NO are facilitated, and the denitration activity is obviously improved.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer and to describe more fully technical solutions of the embodiments of the present disclosure, and to keep the following description of the embodiments of the present disclosure clear and concise, detailed descriptions of known functions and known parts of the disclosure are omitted so as to avoid unnecessarily obscuring the concepts of the present disclosure.
A desulfurization and denitrification agent comprises the following raw materials in parts by weight:
10-15 parts of raw coal
5-8 parts of adhesive
8-13 parts of dilute nitric acid
10-15 parts of ferric nitrate
A preparation method of a desulfurization and denitrification agent comprises the following specific steps:
s1, crushing and screening raw coal, then feeding the raw coal into a fluidized bed mild gasification lignite upgrading reactor, fluidizing the raw coal in the upgrading reactor by hot air, performing mild gasification, combustion and dry distillation reactions in the reactor, controlling the temperature in the reactor within a proper range, and finally discharging the raw material;
s2, adding a binder into the processed raw coal after a powder preparation process, performing an extrusion molding process, drying, carbonizing and activating the dried raw material, and cooling to obtain activated coke, wherein in the carbonization process, the carbonization temperature of a carbonization furnace is 450-550 ℃, and in the activation process, a steam activation process is adopted, and the activation temperature is controlled to be 750-950 ℃;
s3, putting the activated coke into a three-neck round-bottom flask, adding diluted nitric acid solution, carrying out reflux treatment at constant temperature of 85 ℃ for 2h, taking out a sample, washing with water until the pH value is greater than 6, drying at 120 ℃ for 12h, putting the sample into a tubular stainless steel reactor, keeping the temperature of 700 ℃ for 2h under the protection of nitrogen, and cooling to room temperature to obtain a semi-finished product;
and S4, dipping the semi-finished product into ferric nitrate solution with a certain concentration, standing at room temperature for 2h, taking out, drying at 110 ℃ for 12h, keeping the temperature at 700 ℃ for 2h under the protection of nitrogen, and cooling to room temperature to obtain the adsorbent.
After the adsorbent is used, the adsorbent is put into water, stirred for 30 minutes and put into a stainless steel reactor, the temperature is raised to 700 ℃ under the condition of 100mL/min of nitrogen flow, the temperature is kept for 2 hours, and the adsorbent is taken out after being cooled to room temperature and can be recycled.
Example 1
A desulfurization and denitrification agent comprises the following raw materials in parts by weight:
raw coal 10 parts
5 parts of adhesive
Dilute nitric acid 8 portions
10 portions of ferric nitrate
A preparation method of a desulfurization and denitrification agent comprises the following specific steps:
s1, crushing and screening raw coal, then feeding the raw coal into a fluidized bed mild gasification lignite upgrading reactor, fluidizing the raw coal in the upgrading reactor by hot air, performing mild gasification, combustion and dry distillation reactions in the reactor, controlling the temperature in the reactor within a proper range, and finally discharging the raw material;
s2, adding a binder into the processed raw coal after a powder preparation process, performing an extrusion molding process, drying, carbonizing and activating the dried raw material, and cooling to obtain activated coke, wherein in the carbonization process, the carbonization temperature of a carbonization furnace is 450-550 ℃, and in the activation process, a steam activation process is adopted, and the activation temperature is controlled to be 750-950 ℃;
s3, putting the activated coke into a three-neck round-bottom flask, adding diluted nitric acid solution, carrying out reflux treatment at constant temperature of 85 ℃ for 2h, taking out a sample, washing with water until the pH value is greater than 6, drying at 120 ℃ for 12h, putting the sample into a tubular stainless steel reactor, keeping the temperature of 700 ℃ for 2h under the protection of nitrogen, and cooling to room temperature to obtain a semi-finished product;
and S4, dipping the semi-finished product into ferric nitrate solution with a certain concentration, standing at room temperature for 2h, taking out, drying at 110 ℃ for 12h, keeping the temperature at 700 ℃ for 2h under the protection of nitrogen, and cooling to room temperature to obtain the adsorbent.
After the adsorbent is used, the adsorbent is put into water, stirred for 30 minutes and put into a stainless steel reactor, the temperature is raised to 700 ℃ under the condition of 100mL/min of nitrogen flow, the temperature is kept for 2 hours, and the adsorbent is taken out after being cooled to room temperature and can be recycled.
Example 2
A desulfurization and denitrification agent comprises the following raw materials in parts by weight:
raw coal 12 parts
6 parts of adhesive
10 portions of dilute nitric acid
12 parts of ferric nitrate
A preparation method of a desulfurization and denitrification agent comprises the following specific steps:
s1, crushing and screening raw coal, then feeding the raw coal into a fluidized bed mild gasification lignite upgrading reactor, fluidizing the raw coal in the upgrading reactor by hot air, performing mild gasification, combustion and dry distillation reactions in the reactor, controlling the temperature in the reactor within a proper range, and finally discharging the raw material;
s2, adding a binder into the processed raw coal after a powder preparation process, performing an extrusion molding process, drying, carbonizing and activating the dried raw material, and cooling to obtain activated coke, wherein in the carbonization process, the carbonization temperature of a carbonization furnace is 450-550 ℃, and in the activation process, a steam activation process is adopted, and the activation temperature is controlled to be 750-950 ℃;
s3, putting the activated coke into a three-neck round-bottom flask, adding diluted nitric acid solution, carrying out reflux treatment at constant temperature of 85 ℃ for 2h, taking out a sample, washing with water until the pH value is greater than 6, drying at 120 ℃ for 12h, putting the sample into a tubular stainless steel reactor, keeping the temperature of 700 ℃ for 2h under the protection of nitrogen, and cooling to room temperature to obtain a semi-finished product;
and S4, dipping the semi-finished product into ferric nitrate solution with a certain concentration, standing at room temperature for 2h, taking out, drying at 110 ℃ for 12h, keeping the temperature at 700 ℃ for 2h under the protection of nitrogen, and cooling to room temperature to obtain the adsorbent.
After the adsorbent is used, the adsorbent is put into water, stirred for 30 minutes and put into a stainless steel reactor, the temperature is raised to 700 ℃ under the condition of 100mL/min of nitrogen flow, the temperature is kept for 2 hours, and the adsorbent is taken out after being cooled to room temperature and can be recycled.
Example 3
A desulfurization and denitrification agent comprises the following raw materials in parts by weight:
raw coal 15 parts
8 parts of adhesive
Dilute nitric acid 13 portions
15 parts of ferric nitrate
A preparation method of a desulfurization and denitrification agent comprises the following specific steps:
s1, crushing and screening raw coal, then feeding the raw coal into a fluidized bed mild gasification lignite upgrading reactor, fluidizing the raw coal in the upgrading reactor by hot air, performing mild gasification, combustion and dry distillation reactions in the reactor, controlling the temperature in the reactor within a proper range, and finally discharging the raw material;
s2, adding a binder into the processed raw coal after a powder preparation process, performing an extrusion molding process, drying, carbonizing and activating the dried raw material, and cooling to obtain activated coke, wherein in the carbonization process, the carbonization temperature of a carbonization furnace is 450-550 ℃, and in the activation process, a steam activation process is adopted, and the activation temperature is controlled to be 750-950 ℃;
s3, putting the activated coke into a three-neck round-bottom flask, adding diluted nitric acid solution, carrying out reflux treatment at constant temperature of 85 ℃ for 2h, taking out a sample, washing with water until the pH value is greater than 6, drying at 120 ℃ for 12h, putting the sample into a tubular stainless steel reactor, keeping the temperature of 700 ℃ for 2h under the protection of nitrogen, and cooling to room temperature to obtain a semi-finished product;
and S4, dipping the semi-finished product into ferric nitrate solution with a certain concentration, standing at room temperature for 2h, taking out, drying at 110 ℃ for 12h, keeping the temperature at 700 ℃ for 2h under the protection of nitrogen, and cooling to room temperature to obtain the adsorbent.
After the adsorbent is used, the adsorbent is put into water, stirred for 30 minutes and put into a stainless steel reactor, the temperature is raised to 700 ℃ under the condition of 100mL/min of nitrogen flow, the temperature is kept for 2 hours, and the adsorbent is taken out after being cooled to room temperature and can be recycled.
Experiment of
The desulfurization and denitrification agents are prepared according to the formula and the process of the examples 1, 2 and 3, 8 groups of the desulfurization and denitrification agents prepared in the examples 1, 2 and 3 are tested under the same environment, and the desulfurization and denitrification conditions are detected within 6 hours, wherein the detailed data are as follows:
the desulfurization and denitrification agents are prepared according to the formula and the process of the examples 1, 2 and 3, and the desulfurization and denitrification conditions are detected under the same environment and at different times, and the detailed data are as follows:
therefore, the desulfurization and denitrification agent has good desulfurization and denitrification effects.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (8)
1. The desulfurization and denitrification agent is characterized by comprising the following raw materials in parts by weight:
2. the desulfurization and denitrification agent is characterized by comprising the following raw materials in parts by weight:
3. the desulfurization and denitrification agent is characterized by comprising the following raw materials in parts by weight:
4. a desulfurization and denitrification agent is characterized in that: the composite material comprises the following raw materials in parts by weight:
5. the preparation method of the desulfurization and denitrification agent as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps:
s1, crushing and screening raw coal, then feeding the raw coal into a fluidized bed mild gasification lignite upgrading reactor, fluidizing the raw coal in the upgrading reactor by hot air, performing mild gasification, combustion and dry distillation reactions in the reactor, controlling the temperature in the reactor within a proper range, and finally discharging the raw material;
s2, adding an adhesive into the processed raw coal after a powder making process, performing an extrusion molding process, drying, carbonizing and activating the dried raw material, and cooling to obtain activated coke;
s3, putting the activated coke into a three-neck round-bottom flask, adding diluted nitric acid solution, carrying out reflux treatment at constant temperature of 85 ℃ for 2h, taking out a sample, washing with water until the pH value is greater than 6, drying at 120 ℃ for 12h, putting the sample into a tubular stainless steel reactor, keeping the temperature of 700 ℃ for 2h under the protection of nitrogen, and cooling to room temperature to obtain a semi-finished product;
and S4, dipping the semi-finished product into ferric nitrate solution with a certain concentration, standing at room temperature for 2h, taking out, drying at 110 ℃ for 12h, keeping the temperature at 700 ℃ for 2h under the protection of nitrogen, and cooling to room temperature to obtain the adsorbent.
6. The method as claimed in claim 5, wherein the carbonization temperature of the carbonization furnace is 450-550 ℃ in the carbonization process of S2.
7. The method as claimed in claim 5, wherein the activation of S2 is performed by a steam activation process, wherein the activation temperature is controlled at 750-950 ℃.
8. The method for preparing a desulfurization and denitrification agent according to claim 5, wherein the adsorbent obtained in S4 is placed in water after use, stirred for 30 minutes, placed in a stainless steel reactor, heated to 700 ℃ under the condition of a nitrogen flow of 100mL/min, kept at the constant temperature for 2 hours, cooled to room temperature, and taken out for recycling.
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