CN116492826A - Desulfurization and particle removal equipment based on step washing and treatment method thereof - Google Patents

Desulfurization and particle removal equipment based on step washing and treatment method thereof Download PDF

Info

Publication number
CN116492826A
CN116492826A CN202310537664.0A CN202310537664A CN116492826A CN 116492826 A CN116492826 A CN 116492826A CN 202310537664 A CN202310537664 A CN 202310537664A CN 116492826 A CN116492826 A CN 116492826A
Authority
CN
China
Prior art keywords
washing
desulfurization
tower
activated carbon
washing tower
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310537664.0A
Other languages
Chinese (zh)
Inventor
沈敏强
姚盛翔
汪成
何斌斌
赵媛媛
钟志平
柴剑
王德智
陈飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Zheneng Mailing Environmental Technology Co ltd
Original Assignee
Zhejiang Zheneng Mailing Environmental Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Zheneng Mailing Environmental Technology Co ltd filed Critical Zhejiang Zheneng Mailing Environmental Technology Co ltd
Priority to CN202310537664.0A priority Critical patent/CN116492826A/en
Publication of CN116492826A publication Critical patent/CN116492826A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
    • 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
    • B01D53/02—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 by adsorption, e.g. preparative gas chromatography
    • B01D53/04—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 by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/602—Oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/608—Sulfates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention relates to a desulfurization and particle removal device based on cascade washing and a treatment method thereof, which adopt a combination process of cascade washing and semi-dry wet desulfurization and dust removal, have excellent desulfurization and dust removal effects, have the characteristics of energy conservation, environmental protection and low operation cost, and part of liquid in the device is recycled, so that the operation cost and the maintenance cost of each component are reduced.

Description

Desulfurization and particle removal equipment based on step washing and treatment method thereof
Technical Field
The invention belongs to the technical field of marine equipment, and relates to desulfurization and particle removal equipment based on step washing and a treatment method thereof.
Background
The main components of the exhaust gas discharged by the ship comprise the following components: nitrogen oxides, carbon dioxide, sulfides and suspended particulate matters, and in addition, the discharged waste gas may contain a small amount of CO, total hydrocarbons, ammonia and other gases, which are the main reasons for acid rain and one of pollutants for haze, and cause serious harm to the living environment of human beings. At present, the ship exhaust gas washing and desulfurizing method mainly comprises a sea water method and an alkali liquor method for wet washing. The seawater method adopts natural seawater as a washing liquid, the system is simple and stable, but the desulfurization performance is greatly influenced by the physical properties (temperature, alkalinity and the like) of seawater in a sailing sea area, and the system is difficult to ensure to meet the emission requirements of an Emission Control Area (ECA). The alkaline solution method adopts a strong alkali (such as NaOH) solution as a washing solution to circulate in the system, the system can be used in any water area and can realize zero emission, and the defects are that the equipment consumes fresh water and NaOH, fresh water resources on ships are scarce, naOH is expensive and a special cabin is required to be used for storage, so that a series of problems of short endurance distance, high running cost and the like are caused.
Disclosure of Invention
The invention aims to provide a desulfurization and particle removal device based on step washing and a treatment method thereof, which adopt a combined process of step washing and semi-dry wet desulfurization and dust removal, have excellent desulfurization and dust removal effects, have the characteristics of energy conservation, environmental protection and low operation cost, and in addition, part of liquid in the device is recycled, so that the operation cost and the maintenance cost of each component are reduced.
The aim of the invention can be achieved by the following technical scheme:
desulfurization and particle removal equipment based on cascade washing, the equipment include cascade washing tower and with the desulfurizing tower that the cascade washing tower is linked together, the cascade washing tower include first washing tower and with the second washing tower that the first washing tower is linked together, the desulfurizing tower is equipped with activated carbon adsorption layer and locates the spraying area of activated carbon adsorption layer below, the activated carbon adsorption layer is the modified activated carbon of activated carbon doping base material, the spraying area is for adopting mixed desulfurizing agent to spray.
Further, the invention also discloses a preparation method of the mixed desulfurizing agent, which comprises the following steps:
1) Grinding calcium oxide, gypsum and polymer particles, adding deionized water, and grinding while stirring to obtain mixed slurry;
2) Adding ferric oxide into the mixed slurry, stirring and mixing uniformly to obtain the mixed desulfurizing agent.
As a preferred technical scheme of the invention, in the step 1), the mass ratio of the calcium oxide, the gypsum, the polymer particles and the deionized water is 80-95:2-12:3-10:50-60; the polymer reagent is one or more of polyaluminum chloride, polyaluminum sulfate and polyurethane.
As a preferable technical scheme of the invention, in the step 2), the mass ratio of the ferric oxide to the mixed slurry is 1-2%.
The invention further discloses a preparation method of the modified activated carbon, specifically, the activated carbon and the carbon-based material are mixed and then prepared through pyrolysis.
As a preferred embodiment of the present invention, the pyrolysis reaction conditions: under inert gas, the reaction temperature is 700-1100 ℃ and the reaction time is 1-3h; the mass ratio of the activated carbon to the carbon-based material is 1:1.
further, the scheme of the invention also discloses a method for treating ship exhaust gas by using the desulfurization and particle removal equipment based on step washing, which comprises the following steps:
(1) Carrying out solid-liquid separation on the ship exhaust gas after spray washing treatment by a first washing tower to obtain first treated exhaust gas, first sediment and washing wastewater;
(2) Spraying and washing the first treated waste gas by a second washing tower, and carrying out solid-liquid separation to obtain second treated waste gas and second precipitate;
(3) And sequentially passing the second treated waste gas through a spraying area of the desulfurizing tower and an active carbon adsorption layer to obtain exhaust gas.
As a preferable technical scheme of the invention, in the step (1), the first washing tower adopts seawater spraying, wherein the alkalinity of seawater is 700-800 mu mol/L, and the liquid-gas ratio of seawater to ship exhaust gas is 5-7L/m 3 ；
As a preferable technical scheme of the invention, in the step (2), the second washing tower sprays washing wastewater separated by the first washing tower, and the liquid-gas ratio of the washing wastewater to the first treated waste gas is 5-7L/m 3 The method comprises the steps of carrying out a first treatment on the surface of the In the step (3), controlling the reaction temperature in the desulfurizing tower to be 50-60 ℃ and the reaction time to be 2-3h; the pH value of the mixed desulfurizing agent is 4.5-6.5, in the scheme, the pH value of the mixed desulfurizing agent is 4.5-6.5, and in the pH value range, SO can be effectively promoted 2 Absorbing.
Further, the treatment method according to the present invention further comprises filtering, drying and packing the first precipitate in step (1) and the second precipitate in step (2). The main component of the first precipitate and the second precipitate is calcium sulfate, and the method has application in food processing, building industry, paper industry and the like.
As a preferable technical scheme of the invention, the activated carbon of the scheme of the invention is preferably coal activated carbon, and is specifically prepared by carbonizing and activating coal materials. The method has the advantages that the price is relatively low, the removal effect of sulfur dioxide with low concentration is obvious, the effect of sulfur dioxide with high concentration is relatively poor, and the concentration of sulfur dioxide reaching an active carbon layer is low after the ship exhaust gas is desulfurized for many times.
The invention has the beneficial effects that:
1. the waste water generated after the desulfurization of the ship exhaust gas by the seawater is reasonably utilized for secondary washing desulfurization, so that the recycling of the waste water is realized, the concentration of sulfur dioxide in the ship exhaust gas is effectively reduced, and the use cost of the subsequent process is effectively reduced.
2. The polymer particles are added, so that the cost is saved, the reaction rate can be accelerated, and the desulfurization efficiency can be improved; the proper amount of ferric oxide is added to increase the fluidity of the mixed desulfurizing agent, improve the mixing uniformity, reduce the viscosity, prevent caking and reduce the risk of blocking the spray head.
3. The desulfurization effect of the scheme of the invention is good: the calcium oxide, the gypsum and the polyaluminium chloride have better desulfurization effect, and can effectively remove SO in the flue gas 2 And SO 3 The polyaluminium chloride can be used as a catalyst, so that the cost is saved, the reaction rate can be accelerated, the desulfurization efficiency is improved, the desulfurization effect of the waste gas is more obvious, and even if other acid gases such as HCl, HF and the like exist in the waste gas, the waste gas can be effectively removed. The scheme of the invention adopts the calcium oxide and gypsum components which are easy to regenerate, can be recycled and reduce the generation of wastes. In addition, compared with some other desulfurizing agents, the desulfurizing agent formed by mixing calcium oxide, gypsum, polyaluminum chloride and ferric oxide has relatively low cost.
4. The activated carbon prepared by adding the carbon-based material has good mechanical strength, high specific surface area and uniform distribution, stable adsorption performance and lower manufacturing cost, reduces the burden of calcium oxide and improves the removal efficiency.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description is given below with reference to the embodiments, structures, features and effects according to the present invention.
Example 1
Desulfurization and particle removal equipment based on cascade washing, the equipment include cascade washing tower and with the desulfurizing tower that the cascade washing tower is linked together, the cascade washing tower include first washing tower and with the second washing tower that the first washing tower is linked together, the desulfurizing tower is equipped with activated carbon adsorption layer and locates the spraying area of activated carbon adsorption layer below, the activated carbon adsorption layer is the modified activated carbon of activated carbon doping base material, the spraying area is for adopting mixed desulfurizing agent to spray.
The preparation method of the mixed desulfurizing agent comprises the following steps:
1) Grinding calcium oxide, gypsum and polyaluminium chloride, adding deionized water, and grinding while stirring to obtain mixed slurry; wherein, the mass ratio of the calcium oxide, the gypsum, the polyaluminum chloride and the deionized water is 80:2:3:50;
2) Adding ferric oxide into the mixed slurry, and stirring and uniformly mixing to obtain a mixed desulfurizing agent; wherein the mass ratio of the ferric oxide to the mixed slurry is 1%.
The preparation method of the modified activated carbon comprises the steps of mixing activated carbon and a carbon-based material, and reacting at 700 ℃ for 1h under nitrogen gas; the mass ratio of the activated carbon to the carbon-based material is 1:1, preparing the modified activated carbon.
A method of treating ship exhaust gas using a step wash based desulfurization and particulate removal apparatus, the method comprising the steps of:
(1) Carrying out solid-liquid separation on the ship exhaust gas after spray washing treatment by a first washing tower to obtain first treated exhaust gas, first sediment and washing wastewater; wherein the first washing tower adopts seawater spraying, wherein the alkalinity of seawater is 700 mu mol/L, and the liquid-gas ratio of seawater to ship exhaust gas is 5L/m 3 ；
(2) Spraying and washing the first treated waste gas by a second washing tower, and carrying out solid-liquid separation to obtain second treated waste gas and second precipitate; wherein the second washing tower adopts the first washingSpraying washing wastewater separated by the tower, wherein the liquid-gas ratio of the washing wastewater to the first treated waste gas is 5L/m 3 ；
(3) Sequentially passing the second treated waste gas through a spraying area of the desulfurizing tower and an active carbon adsorption layer to obtain exhaust gas; wherein, the reaction temperature in the desulfurizing tower is controlled to be 50 ℃ and the reaction time is controlled to be 2h; the pH value of the mixed desulfurizing agent is 4.5.
Wherein the first precipitate of step (1) and the second precipitate of step (2) are filtered, dried, and packed.
Example 2
Desulfurization and particle removal equipment based on cascade washing, the equipment include cascade washing tower and with the desulfurizing tower that the cascade washing tower is linked together, the cascade washing tower include first washing tower and with the second washing tower that the first washing tower is linked together, the desulfurizing tower is equipped with activated carbon adsorption layer and locates the spraying area of activated carbon adsorption layer below, the activated carbon adsorption layer is the modified activated carbon of activated carbon doping base material, the spraying area is for adopting mixed desulfurizing agent to spray.
The preparation method of the mixed desulfurizing agent comprises the following steps:
1) Grinding calcium oxide, gypsum and polyaluminium chloride, adding deionized water, and grinding while stirring to obtain mixed slurry; wherein, the mass ratio of the calcium oxide, the gypsum, the polyaluminum chloride and the deionized water is 87:7:6.5:55;
2) Adding ferric oxide into the mixed slurry, and stirring and uniformly mixing to obtain a mixed desulfurizing agent; wherein the mass ratio of the ferric oxide to the mixed slurry is 1.5%.
The preparation method of the modified activated carbon comprises the steps of mixing the activated carbon and a carbon-based material, and reacting at 900 ℃ for 2 hours under nitrogen gas; the mass ratio of the activated carbon to the carbon-based material is 1:1, preparing the modified activated carbon.
A method of treating ship exhaust gas using a step wash based desulfurization and particulate removal apparatus, the method comprising the steps of:
(1) The ship exhaust gas is subjected to spray washing treatment by a first washing tower and then is subjected to solid-liquid separationObtaining first treated waste gas, first sediment and washing wastewater; wherein the first washing tower adopts seawater spraying, wherein the alkalinity of seawater is 750 mu mol/L, and the liquid-gas ratio of seawater to ship exhaust gas is 6L/m 3 ；
(2) Spraying and washing the first treated waste gas by a second washing tower, and carrying out solid-liquid separation to obtain second treated waste gas and second precipitate; wherein the second washing tower sprays washing wastewater separated by the first washing tower, and the liquid-gas ratio of the washing wastewater to the first treated waste gas is 6L/m 3 ；
(3) Sequentially passing the second treated waste gas through a spraying area of the desulfurizing tower and an active carbon adsorption layer to obtain exhaust gas; wherein, the reaction temperature in the desulfurizing tower is controlled to be 55 ℃ and the reaction time is controlled to be 2.5h; the pH value of the mixed desulfurizing agent is 5.5.
Wherein the first precipitate of step (1) and the second precipitate of step (2) are filtered, dried, and packed.
Example 3
Desulfurization and particle removal equipment based on cascade washing, the equipment include cascade washing tower and with the desulfurizing tower that the cascade washing tower is linked together, the cascade washing tower include first washing tower and with the second washing tower that the first washing tower is linked together, the desulfurizing tower is equipped with activated carbon adsorption layer and locates the spraying area of activated carbon adsorption layer below, the activated carbon adsorption layer is the modified activated carbon of activated carbon doping base material, the spraying area is for adopting mixed desulfurizing agent to spray.
The preparation method of the mixed desulfurizing agent comprises the following steps:
1) Grinding calcium oxide, gypsum and polyaluminium chloride, adding deionized water, and grinding while stirring to obtain mixed slurry; wherein, the mass ratio of the calcium oxide, the gypsum, the polyaluminum chloride and the deionized water is 95:12:10:60;
2) Adding ferric oxide into the mixed slurry, and stirring and uniformly mixing to obtain a mixed desulfurizing agent; wherein the mass ratio of the ferric oxide to the mixed slurry is 2%.
The preparation method of the modified activated carbon comprises the steps of mixing the activated carbon and a carbon-based material, and reacting at 1100 ℃ for 3 hours under nitrogen gas; the mass ratio of the activated carbon to the carbon-based material is 1:1, preparing the modified activated carbon.
A method of treating ship exhaust gas using a step wash based desulfurization and particulate removal apparatus, the method comprising the steps of:
(1) Carrying out solid-liquid separation on the ship exhaust gas after spray washing treatment by a first washing tower to obtain first treated exhaust gas, first sediment and washing wastewater; wherein the first washing tower adopts seawater spraying, wherein the alkalinity of seawater is 800 mu mol/L, and the liquid-gas ratio of seawater and ship exhaust gas is 7L/m 3 ；
(2) Spraying and washing the first treated waste gas by a second washing tower, and carrying out solid-liquid separation to obtain second treated waste gas and second precipitate; wherein the second washing tower sprays washing wastewater separated by the first washing tower, and the liquid-gas ratio of the washing wastewater to the first treated waste gas is 7L/m 3 ；
(3) Sequentially passing the second treated waste gas through a spraying area of the desulfurizing tower and an active carbon adsorption layer to obtain exhaust gas; wherein, the reaction temperature in the desulfurizing tower is controlled to be 60 ℃ and the reaction time is controlled to be 3h; the pH value of the mixed desulfurizing agent is 6.5.
Wherein the first precipitate of step (1) and the second precipitate of step (2) are filtered, dried, and packed.
Comparative example 1
The difference compared with example 1 is that the mixed desulfurizing agent is not added with polyaluminum chloride, and the rest components, the preparation steps and the parameters are consistent.
Comparative example 2
Compared with example 1, the difference is that the mixed desulfurizing agent is not added with ferric oxide, and the rest components, the preparation steps and parameters are consistent.
Comparative example 3
Compared with the embodiment 1, the difference is that the ship exhaust gas is sprayed and washed by the first washing tower, is directly fed into the separation tower without being sprayed and washed by the second washing tower, and the rest components, the preparation steps and the parameters are consistent.
Comparative example 4
Compared with the embodiment 1, the active carbon adsorption layer is active carbon, the active carbon is not doped with carbon-based materials, and the rest components, the preparation steps and the parameters are consistent.
Desulfurization test:
desulfurization treatment was performed on the simulated flue gas according to the procedures in examples 1 to 3 and comparative examples 1 to 4; the test device consists of a simulated flue gas air supply system, a simulated flue gas treatment system, a simulated flue gas absorption system and a tail gas analysis system, wherein the air supply system provides high-temperature simulated flue gas, and SO in the simulated flue gas 2 The mass concentration is 500mg/m 3 The mass concentration of NO is 1000mg/m 3 The balance being air; the simulated flue gas treatment system provides a condensing pipe and sodium hydroxide solution to spray the simulated flue gas, and controls the temperature of the simulated flue gas after spraying; the simulated flue gas absorption system is a quartz tube filled with adsorbent, and the tail gas analysis system is a flue gas analyzer.
The desulfurization performance evaluation index is desulfurization efficiency eta 1 ；
Desulfurization efficiency eta 1 =[(C 0 -C 1 )]/C 0 ×100%；
Wherein C is 0 Is SO 2 Initial mass concentration, C 1 For treated SO 2 Mass concentration; the test results are shown in table 1 below:
TABLE 1
As can be seen from the test results in Table 1, compared with comparative example 1, the addition of the polyaluminium oxide as a catalyst can accelerate the reaction rate and improve the desulfurization efficiency, so that the desulfurization effect of the waste gas is more obvious, the acid gas is effectively removed, and the desulfurization efficiency of the calcium oxide is synergistically improved; examples 1 to 3 have a lower desulfurization efficiency in comparative example 2 than comparative example 2 because the shower head portion was clogged, affecting the desulfurization efficiency of other components such as calcium oxide and gypsum; examples 1-3 compared with comparative examples 3-4, the use of the wash wastewater from the first wash column to add the second wash column desulfurization process, and the addition of the desulfurization process by the carbon-based material modified activated carbon provides effective assurance of the overall process desulfurization efficiency, improving the overall process desulfurization stability.
In addition, the scheme of the invention adopts the calcium oxide and gypsum components which are easy to regenerate, can be recycled and reduce the generation of wastes. Compared with other desulfurizing agents, the desulfurizing agent formed by mixing calcium oxide, gypsum, polyaluminum chloride and ferric oxide has relatively low cost.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.

Claims (10)

1. Desulfurization removes particulate equipment based on step washing, its characterized in that: the equipment comprises a step washing tower and a desulfurization tower communicated with the step washing tower, wherein the step washing tower comprises a first washing tower and a second washing tower communicated with the first washing tower, the desulfurization tower is provided with an activated carbon adsorption layer and a spraying area arranged below the activated carbon adsorption layer, the activated carbon adsorption layer is modified activated carbon of an activated carbon-doped base material, and the spraying area is sprayed by adopting a mixed desulfurizing agent.
2. The step-washing-based desulfurization and particulate removal apparatus as claimed in claim 1, wherein the preparation method of the mixed desulfurizing agent comprises the steps of:
1) Grinding calcium oxide, gypsum and polymer particles, adding deionized water, and grinding while stirring to obtain mixed slurry;
2) Adding ferric oxide into the mixed slurry, stirring and mixing uniformly to obtain the mixed desulfurizing agent.
3. The step-wash-based desulfurization and particulate removal apparatus according to claim 2, wherein: in the step 1), the mass ratio of the calcium oxide to the gypsum to the polymer particles to the deionized water is 80-95:2-12:3-10:50-60; the polymer reagent is one or more of polyaluminum chloride, polyaluminum sulfate and polyurethane.
4. The step-wash-based desulfurization and particulate removal apparatus according to claim 2, wherein: in step 2), the mass ratio of the ferric oxide to the mixed slurry is 1-2%.
5. The desulfurization and particulate removal device based on step washing according to claim 1, wherein the modified activated carbon is prepared by mixing activated carbon and a carbon-based material and then preparing the mixture by pyrolysis.
6. The step-wash based desulfurization and particulate removal apparatus of claim 5, wherein the pyrolysis reaction conditions: under inert gas, the reaction temperature is 700-1100 ℃ and the reaction time is 1-3h; the mass ratio of the activated carbon to the carbon-based material is 1:1.
7. a method of treating ship exhaust gas using the step-wash-based desulfurization and particulate removal apparatus as claimed in any one of claims 1 to 6, comprising the steps of:
(1) Carrying out solid-liquid separation on the ship exhaust gas after spray washing treatment by a first washing tower to obtain first treated exhaust gas, first sediment and washing wastewater;
(2) Spraying and washing the first treated waste gas by a second washing tower, and carrying out solid-liquid separation to obtain second treated waste gas and second precipitate;
(3) And sequentially passing the second treated waste gas through a spraying area of the desulfurizing tower and an active carbon adsorption layer to obtain exhaust gas.
8. The method for treating ship exhaust gas using a step-wash based desulfurization and particulate removal apparatus according to claim 7, wherein: in the step (1), the first washing tower adopts seawater spraying, wherein the alkalinity of seawater is 700-800 mu mol/L, and the liquid-gas ratio of seawater to ship exhaust gas is 5-7L/m 3 。
9. The method for treating ship exhaust gas using a step-wash based desulfurization and particulate removal apparatus according to claim 7, wherein: in the step (2), the second washing tower sprays washing wastewater separated by the first washing tower, and the liquid-gas ratio of the washing wastewater to the first treated waste gas is 5-7L/m 3 The method comprises the steps of carrying out a first treatment on the surface of the In the step (3), controlling the reaction temperature in the desulfurizing tower to be 50-60 ℃ and the reaction time to be 2-3h; the pH value of the mixed desulfurizing agent is 4.5-6.5.
10. The method for treating ship exhaust gas using a step-wash based desulfurization and particulate removal apparatus according to claim 7, wherein: the treatment method further comprises the steps of filtering, drying and packaging the first precipitate in the step (1) and the second precipitate in the step (2).
CN202310537664.0A 2023-05-15 2023-05-15 Desulfurization and particle removal equipment based on step washing and treatment method thereof Pending CN116492826A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310537664.0A CN116492826A (en) 2023-05-15 2023-05-15 Desulfurization and particle removal equipment based on step washing and treatment method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310537664.0A CN116492826A (en) 2023-05-15 2023-05-15 Desulfurization and particle removal equipment based on step washing and treatment method thereof

Publications (1)

Publication Number Publication Date
CN116492826A true CN116492826A (en) 2023-07-28

Family

ID=87328287

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310537664.0A Pending CN116492826A (en) 2023-05-15 2023-05-15 Desulfurization and particle removal equipment based on step washing and treatment method thereof

Country Status (1)

Country Link
CN (1) CN116492826A (en)

Similar Documents

Publication Publication Date Title
CN102350197B (en) Fume desulfurizing and denitrifying device based on magnesia and method
CN103894047B (en) Flue gas pollutant controls integrated purifying recovery process
CN211886232U (en) Sodium-based dry desulfurization system applied to low-sulfur flue gas working condition
CN107551799B (en) Dry-method cement kiln flue gas desulfurization and denitrification integrated method
US20210170334A1 (en) System and method for desulfurization and denitrification of alumina calcination flue gas, and use
CN1539546A (en) Method and equipment of desulfurization and denitrogenation for purifying flue gas
CN113800787A (en) Preparation method of high-activity calcium hydroxide
CN107281924A (en) A kind of improved ammonia desulfurizing process and system
CN110893312A (en) Novel high-efficiency desulfurizer and preparation method thereof
CN103585869A (en) Flue gas purifying method with recyclable alkali absorption liquid
CN114229852B (en) SO in flue gas is removed by utilizing steel slag 2 Method for synergistically extracting silica gel
CN103007718A (en) Wet redox, desulfuration and resource utilization method for flue gas
CN103861426B (en) A kind of flue gas desulfurization and dedusting also reclaims the method for sodium sulfite
CN102614775A (en) Method for removing and recovering low concentration sulfur dioxide in industrial exhaust gas
CN206762618U (en) A kind of dry-wet integratedization desulfuring and denitrifying apparatus
CN103007734B (en) Application of sugar-mill lime sludge in wet flue gas desulfurization
CN109772427B (en) Catalyst for recycling sulfur and nitrogen in absorption liquid of magnesium-method simultaneous desulfurization and denitrification process and preparation and application thereof
CN116492826A (en) Desulfurization and particle removal equipment based on step washing and treatment method thereof
CN108654311A (en) A kind of high-efficiency desulfurization denitration absorbent and preparation method thereof
CN108939904A (en) A kind of desulfurizing agent composition and its application in clinker production
CN111701437A (en) Flue gas desulfurizing agent
CN209957394U (en) System for utilize desulfurization ash to make anhydrous sodium sulphate
CN110152465B (en) Flue gas whitening system and method for lime-gypsum method desulfurization
CN103752135A (en) Tail gas purification method for carbon black plant
CN106994292A (en) A kind of desulfurizing agent and its application, and using the desulphurization system of the desulfurizing agent

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination