CN106582250B - desulfurizing and mercury-removing agent for fixed bed reactor and its preparing process - Google Patents

desulfurizing and mercury-removing agent for fixed bed reactor and its preparing process Download PDF

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CN106582250B
CN106582250B CN201611191880.0A CN201611191880A CN106582250B CN 106582250 B CN106582250 B CN 106582250B CN 201611191880 A CN201611191880 A CN 201611191880A CN 106582250 B CN106582250 B CN 106582250B
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powder
desulfurization
carrier
bed reactor
fixed bed
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CN106582250A (en
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陈肖虎
黎志英
刘利
金会心
陈庆
唐道文
赵平原
王丽远
鲁圣军
黄碧芳
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Guizhou University
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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
    • B01D53/81—Solid phase processes
    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/508—Sulfur oxides by treating the gases with solids
    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/64—Heavy metals or compounds thereof, e.g. mercury
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/60—Heavy metals or heavy metal compounds
    • B01D2257/602—Mercury or mercury compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
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Abstract

The invention relates to the technical field of desulfurization and demercuration, in particular to catalyst for fixed bed reactionThe desulfurizing and mercury-removing agent for reactor is prepared from pyrolusite powder and gamma-Fe2O3The powder is used as an active component raw material of the desulfurization and demercuration agent, and the carrier is used for loading the active component and then is applied to the fixed bed reactor, so that the desulfurization rate in flue gas can reach more than 90 percent, and the mercury removal rate can reach more than 83 percent.

Description

desulfurizing and mercury-removing agent for fixed bed reactor and its preparing process
Technical Field
The invention relates to the technical field of desulfurization and demercuration, in particular to desulfurization and demercuration agents used in a fixed bed reactor and a preparation method thereof.
Background
The industrial gases such as coal, coke oven gas, water gas, natural gas and the like all contain mercury and sulfur components, and in the combustion process, sulfur and mercury form sulfur dioxide gas and mercury molecules or ionic mercury are diffused in combustion tail gas and enter the air along with the emission of the tail gas to cause serious pollution to the environment, thereby bringing serious health threat to human beings.
In the prior art, the methods for removing the sulfur and the mercury comprise a wet method and a dry method, but the removal rate of the sulfur and the mercury in the combustion tail gas is mostly maintained below 80% and the removal rate of the mercury is maintained about 76% no matter the wet method or the dry method is used for removing the sulfur and the mercury.
For example, 200810118580.9 provides methods for preparing the desulfurizing and mercury-removing agent by using manganese dioxide and magnetic iron oxide as active components and mixing the active components with a carrier, but the magnetic iron oxide used in the desulfurizing and mercury-removing agent is Fe21.333O3The components are prepared by enterprises, and the cost for preparing the components is higher, so that of the desulfurization and demercuration agent has poor application prospect, the application cost is higher, and the cost for removing sulfur and mercury in tail gas and hydrocarbon components in the combustion process of industrial gas is higher.
Based on this, this researcher selects the raw materials composition of desulfurization demercuration agent to carry out the collocation processing to the raw materials composition who selects, make desulfurization demercuration agent reach more than 99.3% to the desulfurization demercuration rate in the tail gas, for coal fired power plant flue gas, oil refining and the tail gas that chemical plant light hydrocarbon desulfurization demercuration produced carry out desulfurization demercuration and handle new reagents, reduced desulfurization demercuration treatment cost.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides desulfurization and mercury removal agents for a fixed bed reactor and a preparation method thereof.
The method is realized by the following technical scheme:
desulfurizing and mercury-removing agent for fixed-bed reactor, which is composed of carrier and active components including pyrolusite powder and gamma-Fe2O3The powder is prepared from the following components in percentage by mass of 100: 0.5-19 parts by weight of a mixture; the carrier accounts for 20-60% of the total mass of the desulfurization and demercuration agent. For gamma-Fe2O3Is a raw material product in daily production process, is easy to obtain and has lower preparation cost, and simultaneously, pyrolusite is used as of active ingredients, so that pyrolusite and gamma-Fe are mixed2O3The combined action of the two components enhances the absorption of sulfur dioxide and ionic mercury, improves the adsorption of molecular mercury, and greatly removes the content of mercury and sulfur in the discharged tail gas.
The carrier is active carbon and gamma-Al2O3At least carriers of montmorillonite, diatomite and silicon dioxide are selected, so that the carriers can be effectively fixed in a fixed bed layer after entering a fixed bed reactor, the flue gas can be fully contacted after entering the fixed bed reactor, the removal rate of sulfur and mercury components in the flue gas is improved, and the carriers can be beneficial to the adsorption of the sulfur and mercury components in the removal process and the removal rate is improved.
The pyrolusite powder is modified by microwave radiation. Through microwave radiation, the active ingredients in the pyrolusite are greatly activated, the activation energy in the process of the action of the pyrolusite and sulfur and mercury ingredients in the flue gas is reduced, and the desulfurization and demercuration efficiency is improved.
In the pyrolusite powder treatment process, the microwave radiation is preferably performed with the radiation power of 70-130W and the radiation time of 15-20 min.
The pyrolusite powder is 40-110 meshes. Through the limitation of the granularity, the specific surface area of the pyrolusite powder is greatly improved, the defect that flue gas enters and is taken away due to fine dust is avoided, the desulfurization and demercuration efficiency is improved, and the desulfurization and demercuration cost is reduced.
Preferably, the carrier accounts for 30-50% of the total mass of the desulfurization and demercuration agent.
Preferably, the specific surface area of the carrier is 90-110m2A pore volume of 2.5-3.5 cm/g3(ii) in terms of/g. The active component can be well contacted with the carrier, the contact probability of the active component and sulfur and mercury components in the flue gas is improved, and the desulfurization and demercuration efficiency is improved.
In order to enable the sulfur dioxide to greatly reduce the reaction activation energy in the action process of the desulfurization and mercury removal agent, the carrier is preferably powder which is prepared by mixing manganese carbonate according to the mass ratio of 1:0.2-0.7, calcining at the temperature of 120-170 ℃ for 10-20min, and grinding.
The preparation method of the desulfurization and mercury removal agent used in the fixed bed reactor comprises the following steps:
(1) pulverizing pyrolusite, treating with microwave radiation, and adding gamma-Fe during microwave radiation2O3Uniformly stirring the powder to obtain a mixture; or pulverizing pyrolusite, adding water to obtain pulp, treating with microwave radiation, and adding gamma-Fe during microwave radiation2O3Powder, evenly stirring, spray drying, and sieving with a 30-80 mesh sieve to obtain a mixture;
(2) mixing a carrier and manganese carbonate according to a mass ratio of 1:0.2-0.7, calcining at the temperature of 120-170 ℃ for 10-20min, and grinding into powder of 30-90 meshes;
(3) and (3) mixing the mixture obtained in the step (1) and the powder obtained in the step (2) to ensure that the carrier accounts for 20-60% of the total mass of the desulfurization and demercuration agent, and performing ultrasonic treatment for 10-20 min.
The frequency of the ultrasonic wave is 20-200 MHz.
In the preparation step, the pyrolusite powder and the gamma-Fe 2O3 powder are subjected to microwave radiation to obtain pyrolusite powder and gamma-Fe2O3The activity of the powder is enhanced and the pyrolusite powder and gamma-Fe are promoted2O3The powder interacts with each other, so that the desulfurization and demercuration activity is improved, and the desulfurization and demercuration efficiency is improved; and the active component and the carrier are uniformly mixed through mixing, calcining and grinding the carrier and the manganese carbonate, mixing the active component and the carrier component and then carrying out ultrasonic mixing treatment,the existence of active components around the surface of each particle of the carrier is ensured, so that the removal efficiency of sulfur and mercury components reaches more than 99 percent.
The invention preferably treats the flue gas with the temperature of 80-100 ℃.
The desulfurization and demercuration agent is suitable for desulfurization and demercuration treatment in a fixed bed reactor and a fluidized bed reactor.
The invention aims to prove the effect of the desulfurization and demercuration agent, and the desulfurization and demercuration agent is subjected to the following experimental treatment:
test column 1
Pulverizing 30g pyrolusite powder into powder, and adding gamma-Fe2O3Powder, active ingredient, and diatomite as carrier, wherein the gamma-Fe is2O3The powder accounts for 19 percent of the mass of the pyrolusite powder, the diatomite accounts for 20 percent of the mass of the pyrolusite powder, the powder is filled into a fixed bed reactor, the sulfur-containing and mercury-containing flue gas is introduced at the flow speed of 11L/min, the sulfur content and the mercury content of a flue gas inlet and a flue gas discharge port of the fixed bed reactor are detected, and the results are as follows: the sulfur content in the discharge port flue gas accounts for 9.7 percent of the mass of the sulfur content in the inlet flue gas, and the mercury content in the discharge port flue gas accounts for 6.8 percent of the mass of the mercury content in the inlet flue gas.
Test column 2
Crushing 30g of pyrolusite into powder, and treating the powder by microwave radiation, wherein the microwave power is 80W, and the radiation lasts 20 min; adding gamma-Fe thereto2O3The powder, the addition amount is 19% of the pyrolusite powder mass, and then after mixing with the diatomite, the diatomite mass ratio after mixing is 20%, filling into a fixed bed reactor, introducing the sulfur-containing and mercury-containing flue gas at the flow rate of 11L/min, and detecting the sulfur content and the mercury content of the flue gas inlet and the flue gas discharge port of the fixed bed reactor, wherein the result is as follows: the sulfur content in the exhaust port flue gas accounts for 3.5 percent of the mass of the sulfur content in the inlet flue gas, and the mercury content in the exhaust port flue gas accounts for 5.1 percent of the mass of the mercury content in the inlet flue gas.
Test column 3
30g of soft manganesePulverizing ore into powder, treating with microwave radiation at 80W for 20min, and adding gamma-Fe during the radiation process2O3The adding amount of the powder is 19% of the mass of the pyrolusite powder, the powder and the diatomite are mixed, the mass ratio of the diatomite after mixing is 20%, the mixture is filled into a fixed bed reactor, the sulfur-containing and mercury-containing flue gas is introduced at the flow rate of 11L/min, the sulfur content and the mercury content of a flue gas inlet and a flue gas discharge port of the fixed bed reactor are detected, and the result is that: the sulfur content in the exhaust port flue gas accounts for 0.5 percent of the mass of the sulfur content in the inlet flue gas, and the mercury content in the exhaust port flue gas accounts for 0.7 percent of the mass of the mercury content in the inlet flue gas.
Test column 4
Pulverizing 30g pyrolusite into powder, treating with microwave radiation with microwave power of 80W for 20min, and adding gamma-Fe 19 wt% of pyrolusite powder during the radiation process2O3Powder to obtain a mixture; mixing diatomite and manganese carbonate according to a mass ratio of 1:0.2, calcining at 120 ℃ for 10min, and grinding into powder of 30 meshes to obtain a modified carrier; mixing the mixture with a modified carrier, wherein the mixing ratio ensures that the mass of the diatomite accounts for 20% of the total mass after mixing, treating the diatomite for 10min by adopting ultrasonic waves with the ultrasonic frequency of 20MHz, filling the diatomite into a fixed bed reactor, introducing flue gas containing sulfur and mercury at the flow rate of 11L/min, and detecting the sulfur content and the mercury content of a flue gas inlet and a flue gas discharge port of the fixed bed reactor, wherein the result is as follows: the sulfur content in the exhaust port flue gas accounts for 0.3 percent of the mass of the sulfur content in the inlet flue gas, and the mercury content in the exhaust port flue gas accounts for 0.4 percent of the mass of the mercury content in the inlet flue gas.
As can be seen from the above experimental treatments, pyrolusite powder can be activated and enhanced with gamma-Fe in the microwave irradiation treatment process2O3The powder has the removal rate of sulfur and mercury in the flue gas together, but the pyrolusite powder and the gamma-Fe are used2O3The powder is treated by microwave radiation, which can greatly improve activity and improve smoke gas activityEspecially, after the carrier is mixed with manganese carbonate and treated, the mixture of the active component and the carrier is treated by ultrasonic waves, the desulfurization and demercuration performance of the obtained desulfurization and demercuration agent can be further improved by , and the efficiency of desulfurization and demercuration can reach more than 99.5%.
The invention is created by mixing pyrolusite powder and gamma-Fe2O3The powder is used as an active component raw material of the desulfurization and demercuration agent, and the active component is loaded by a carrier and then applied to a fixed bed reactor, so that the desulfurization rate in flue gas can reach more than 90 percent, and the mercury removal rate can reach more than 83 percent; and activating by microwave radiation to treat pyrolusite powder or gamma-Fe2O3When the powder is mixed with pyrolusite powder, the activity of the desulfurization and demercuration agent can be greatly improved, the removal rate of sulfur and mercury components is improved, the desulfurization efficiency reaches over 96 percent, the demercuration efficiency reaches over 94 percent, pyrolusite in the desulfurization and demercuration agent generally exists in nature and is easy to obtain, and gamma-Fe is easy to obtain2O3The preparation process of the powder is simple, so that the cost is low, and the cost for removing sulfur and mercury in the flue gas is reduced.
The invention preferably adopts the fluidized bed reactor to remove the flue gas, so that the removal rate of the sulfur and mercury components in the flue gas can reach more than 99.7 percent, and the flue gas is basically and completely purified.
The method comprises the steps of preparing pyrolusite powder and water into ore pulp, adopting microwave radiation after the solid-liquid ratio of the ore pulp is 0.7-1.3, and adding gamma-Fe2O3After the powder is treated by spray drying, the powder is used for preparing the desulfurization and demercuration agent in the preparation method process, and the removal rate of sulfur and mercury components in the flue gas can reach more than 99 percent.
The support in the invention is preferably gamma-Al2O3And montmorillonite in a mass ratio of 1: 3.
When diatomaceous earth is mixed with other carriers, the mass ratio of diatomaceous earth is preferably 17%.
Detailed Description
The technical solution of the present invention is further defined in step with reference to the specific embodiments, but the scope of the claims is not limited to the description.
desulfurizing and mercury-removing agent for fixed-bed reactor, which is composed of carrier and active components including pyrolusite powder and gamma-Fe2O3The powder is prepared from the following components in percentage by mass of 100: 0.5-19 parts by weight of a mixture; the carrier accounts for 20-60% of the total mass of the desulfurization and demercuration agent.
In certain embodiments, the support is activated carbon, gamma-Al2O3At least kinds of montmorillonite, diatomite, and silica.
In certain embodiments, the pyrolusite powder is modified by microwave radiation.
In some embodiments, the microwave radiation has a radiation power of 70-130W and a radiation time of 15-20 min.
In certain embodiments, the pyrolusite powder is 40-110 mesh.
In some embodiments, the carrier accounts for 30-50% of the total mass of the desulfurization and demercuration agent.
In certain embodiments, the support has a specific surface area of 90 to 110m2A pore volume of 2.5-3.5 cm/g3/g。
In some embodiments, the carrier is powder obtained by mixing manganese carbonate with the carrier according to a mass ratio of 1:0.2-0.7, calcining at the temperature of 120-170 ℃ for 10-20min, and grinding.
In certain embodiments, for a method for preparing a desulfurization and demercuration agent for use in a fixed bed reactor, the method comprises the steps of:
(1) pulverizing pyrolusite, treating with microwave radiation, and adding gamma-Fe during microwave radiation2O3Uniformly stirring the powder to obtain a mixture; or pulverizing pyrolusite, adding water, and making into oreTreating the slurry by microwave radiation, and adding gamma-Fe in the microwave radiation process2O3Powder, evenly stirring, spray drying, and sieving with a 30-80 mesh sieve to obtain a mixture;
(2) mixing a carrier and manganese carbonate according to a mass ratio of 1:0.2-0.7, calcining at the temperature of 120-170 ℃ for 10-20min, and grinding into powder of 30-90 meshes;
(3) and (3) mixing the mixture obtained in the step (1) and the powder obtained in the step (2) to ensure that the carrier accounts for 20-60% of the total mass of the desulfurization and demercuration agent, and performing ultrasonic treatment for 10-20 min.
In some embodiments, the ultrasonic waves have a frequency of 20-200 MHz.
Example 1
desulfurization and mercury removal agents used in a fixed bed reactor, which consist of a carrier and an active component, wherein the active component is a mixture of pyrolusite powder and gamma-Fe 2O3 powder in a mass ratio of 100: 0.5, the carrier accounts for 20% of the total mass of the desulfurization and mercury removal agents, and the carrier is activated carbon.
Example 2
desulfurization and demercuration agents used in a fixed bed reactor, which consists of a carrier and active components, wherein the active components are a mixture of pyrolusite powder and gamma-Fe 2O3 powder mixed according to the mass ratio of 100:19, the carrier accounts for 60% of the total mass of the desulfurization and demercuration agents, and the carrier is a mixture of silicon dioxide and active carbon in any mass ratio.
Example 3
desulfurization and demercuration agents used in a fixed bed reactor, which consists of a carrier and an active component, wherein the active component is a mixture of pyrolusite powder and gamma-Fe 2O3 powder mixed according to a mass ratio of 100:10, the carrier accounts for 40% of the total mass of the desulfurization and demercuration agent, and the carrier is diatomite and gamma-Al 2O3 mixed according to any mass ratio.
Example 4
desulfurization and demercuration agents used in a fixed bed reactor, which consists of a carrier and active components, wherein the active components are a mixture of pyrolusite powder and gamma-Fe 2O3 powder mixed according to a mass ratio of 100:15, the carrier accounts for 50% of the total mass of the desulfurization and demercuration agents, and the carrier is formed by mixing montmorillonite, silicon dioxide and diatomite according to any mass ratio.
Example 5
A method for preparing a desulfurization and demercuration agent used in a fixed bed reactor, comprising the following steps:
(1) pulverizing pyrolusite, treating with microwave radiation, and adding gamma-Fe during microwave radiation2O3Powder, pyrolusite and gamma-Fe2O3The mass ratio of the powder is 100: 0-19, and the mixture is obtained after uniform stirring;
(2) mixing the carrier and manganese carbonate according to the mass ratio of 1:0.2, calcining at 120 ℃ for 10min, and grinding into powder of 30 meshes;
(3) and (3) mixing the mixture obtained in the step (1) with the powder obtained in the step (2) to enable the carrier to account for 20% of the total mass of the desulfurization and demercuration agent, and performing ultrasonic treatment for 10min at the ultrasonic frequency of 20 MHz.
The carrier is active carbon and gamma-Al2O3Mixing at any mass ratio.
Example 6
A method for preparing a desulfurization and demercuration agent used in a fixed bed reactor, comprising the following steps:
(1) pulverizing pyrolusite, treating with microwave radiation, and adding gamma-Fe during microwave radiation2O3Powder, pyrolusite and gamma-Fe2O3The mass ratio of the powder is 100:19, and the mixture is obtained after uniform stirring;
(2) mixing the carrier and manganese carbonate according to the mass ratio of 1:0.7, calcining at the temperature of 170 ℃ for 20min, and grinding into powder of 90 meshes;
(3) and (3) mixing the mixture obtained in the step (1) with the powder obtained in the step (2) to ensure that the carrier accounts for 60% of the total mass of the desulfurization and demercuration agent, and treating the mixture for 20min by adopting ultrasonic waves with the ultrasonic frequency of 200 MHz.
The carrier is active carbon and gamma-Al2O3And montmorillonite are mixed according to any mass ratio.
Example 7
A method for preparing a desulfurization and demercuration agent used in a fixed bed reactor, comprising the following steps:
(1) pulverizing pyrolusite, adding water to obtain pulp, treating with microwave radiation, and adding gamma-Fe during microwave radiation2O3Powder, pyrolusite and gamma-Fe2O3The mass ratio of the powder is 100:15, the powder is uniformly stirred, spray-dried and sieved by a 80-mesh sieve to obtain a mixture;
(2) mixing the carrier and manganese carbonate according to the mass ratio of 1:0.5, calcining at 160 ℃ for 15min, and grinding into powder of 80 meshes;
(3) and (3) mixing the mixture obtained in the step (1) with the powder obtained in the step (2) to ensure that the carrier accounts for 40% of the total mass of the desulfurization and demercuration agent, and treating the mixture for 15min by adopting ultrasonic waves with the ultrasonic frequency of 100 MHz.
The carrier is active carbon and gamma-Al2O3Montmorillonite and diatomite are mixed according to any mass ratio.
Example 8
A method for preparing a desulfurization and demercuration agent used in a fixed bed reactor, comprising the following steps:
(1) pulverizing pyrolusite, adding water to obtain pulp, treating with microwave radiation, and adding gamma-Fe during microwave radiation2O3Powder, pyrolusite and gamma-Fe2O3The mass ratio of the powder is 100:10, the powder is uniformly stirred, spray-dried and sieved by a 70-mesh sieve to obtain a mixture;
(2) mixing the carrier and manganese carbonate according to the mass ratio of 1:0.6, calcining at the temperature of 130 ℃ for 17min, and grinding into powder of 50 meshes;
(3) and (3) mixing the mixture obtained in the step (1) and the powder obtained in the step (2) to ensure that the carrier accounts for 30% of the total mass of the desulfurization and demercuration agent, and treating the mixture for 13min by adopting ultrasonic waves with the frequency of 50 MHz.
The carrier is active carbon and gamma-Al2O3Montmorillonite, diatomite and silicon dioxide are mixed according to any mass ratio.
Example 9
A method for preparing a desulfurization and demercuration agent used in a fixed bed reactor, comprising the following steps:
(1) pulverizing pyrolusite, adding water to obtain pulp, treating with microwave radiation, and adding gamma-Fe during microwave radiation2O3Powder, pyrolusite and gamma-Fe2O3The mass ratio of the powder is 100:1, the powder is uniformly stirred, spray-dried and sieved by a 70-mesh sieve to obtain a mixture;
(2) mixing the carrier and manganese carbonate according to the mass ratio of 1:0.3, calcining at the temperature of 120 ℃ for 20min, and grinding into powder of 90 meshes;
(3) and (3) mixing the mixture obtained in the step (1) with the powder obtained in the step (2) to enable the carrier to account for 20% of the total mass of the desulfurization and demercuration agent, and performing ultrasonic treatment for 20min at the ultrasonic frequency of 20 MHz.
The carrier is gamma-Al2O3Montmorillonite, diatomite and silicon dioxide are mixed according to any mass ratio.
The invention also applies the desulfurization and demercuration agent prepared by the preparation method of the desulfurization and demercuration agent or the embodiment 1-9 in the fluidized bed reactor, fills the desulfurization and demercuration agent into the fluidized bed reactor to serve as a fluidized bed layer, and introduces the flue gas containing sulfur and mercury into the fluidized bed reactor at the flow rate of 15L/min, the temperature of the flue gas is 80-100 ℃, the content of sulfur and mercury in the flue gas at the inlet and the outlet of the fluidized bed reactor is detected, the mass percentage of the sulfur and mercury in the flue gas at the outlet in the sulfur and mercury components in the flue gas at the inlet is analyzed, the result is that the sulfur percentage is below 9.5%, the mercury percentage is below 16.6%, and the minimum removal rate of sulfur and mercury in the flue gas can reach above 90% in the fluidized bed reaction.

Claims (6)

1, desulfurizing and mercury-removing agent used in fixed bed reactor, which consists of modified carrier and active components, and is characterized in that the active components are pyrolusite powder and gamma-Fe2O3The powder is prepared from the following components in percentage by mass of 100: 0.5-19 parts by weight of a mixture; the preparation method of the desulfurization and demercuration agent used in the fixed bed reactor,
the method comprises the following steps:
(1) getCrushing pyrolusite, treating with microwave radiation, and adding gamma-Fe during microwave radiation2O3Uniformly stirring the powder to obtain a mixture; or pulverizing pyrolusite, adding water to obtain pulp, treating with microwave radiation, and adding gamma-Fe during microwave radiation2O3Powder, evenly stirring, spray drying, and sieving with a 30-80 mesh sieve to obtain a mixture;
(2) mixing a carrier and manganese carbonate according to a mass ratio of 1:0.2-0.7, calcining at the temperature of 120-170 ℃ for 10-20min, and grinding into powder of 30-90 meshes to prepare a modified carrier;
(3) mixing the mixture in the step (1) with the modified carrier in the step (2), and treating for 10-20min by adopting ultrasonic waves;
the carrier accounts for 30-50% of the total mass of the desulfurization and demercuration agent;
the specific surface area of the carrier is 90-110m2A pore volume of 2.5-3.5 cm/g3/g。
2. The desulfurization and demercuration agent for a fixed bed reactor as recited in claim 1, wherein the carrier is activated carbon, γ -Al2O3At least kinds of montmorillonite, diatomite, and silica.
3. The desulfurization and demercuration agent for the fixed bed reactor as recited in claim 1, wherein the pyrolusite powder is modified by microwave radiation.
4. The desulfurization and demercuration agent for the fixed bed reactor as recited in claim 3, wherein the microwave radiation has a radiation power of 70-130W and a radiation time of 15-20 min.
5. The desulfurization and demercuration agent for the fixed bed reactor as recited in claim 1 or 3, wherein the pyrolusite powder is 40-110 meshes.
6. The desulfurization and demercuration agent for a fixed bed reactor as recited in claim 1, wherein the ultrasonic wave has a frequency of 20 to 200 MHz.
CN201611191880.0A 2016-12-21 2016-12-21 desulfurizing and mercury-removing agent for fixed bed reactor and its preparing process Active CN106582250B (en)

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