CN110152476B - Device and method for synchronous desulfurization and denitrification of flue gas - Google Patents
Device and method for synchronous desulfurization and denitrification of flue gas Download PDFInfo
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- CN110152476B CN110152476B CN201910524764.3A CN201910524764A CN110152476B CN 110152476 B CN110152476 B CN 110152476B CN 201910524764 A CN201910524764 A CN 201910524764A CN 110152476 B CN110152476 B CN 110152476B
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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
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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Abstract
The invention discloses a device and a method for synchronously desulfurizing and denitrating flue gas, wherein porous filler is filled in a box-shaped plate frame to be used as a gas-permeable absorption and reaction medium, washing absorption liquid containing polyethylene glycol and manganese oxide is added into a flue gas pipeline in a spraying mode, the washing absorption liquid forms a liquid film on the surface of the filler, and the manganese oxide converts NO and SO in the flue gas2Nitrate and sulfate. Device and method for synchronous desulfurization and denitrification, and SO2The removal rate is maintained to be more than 95 percent, the NO removal rate is maintained to be more than 80 percent, reaction products can be separated and utilized, and the equipment is simple, the operation cost is low, and the method has good prospects.
Description
Technical Field
The invention belongs to the field of atmospheric pollution control engineering, and particularly relates to a flue gas treatment method for synchronous desulfurization and denitrification by a wet absorption method.
Background
A great deal of SO is generated in the high-temperature combustion process of various boilers and kilns2NOx, causes acid rain in 81.6% of cities across the country. Nitrogen oxide emissions can also lead to regional environmental pollution problems such as photochemical smog and ozone layer depletion. Technologies currently used to control nitrogen oxide emissions include Selective Catalytic Oxidation (SCO), non-selective catalytic reduction (SNCR), and Selective Catalytic Reduction (SCR). The desulfurization process mainly adopts a wet method and a semi-dry method, wherein the desulfurization process mainly adopts a calcium method and accounts for about 85 percent of the market proportion. At present, the flue gas purification process widely used in China is a combined flue gas treatment process of high-temperature SCR denitration, dust removal and wet desulphurization, on one hand, a large amount of ammonia is consumed, the risk of ammonia escape exists, and on the other hand, a large amount of desulfurized gypsum which is difficult to recycle is also byproduct. The separate and independent flue gas desulfurization and denitration technologies have the advantages of large one-time investment, high operating cost and large occupied area, and the synchronous desulfurization and denitration technology is expected to overcome the difficulties.
China is a major manganese-containing country in the world, Hunan, Hubei, Sichuan, Chongqing, Guangxi, Anhui, Yunnan, Gansu, Ningxia and GansuThe manganese oxide ore reserves in the middle and western regions such as Qinghai are abundant, in recent years, the national geological exploration departments find a plurality of ultra-large manganese ore deposits in Guizhou, Guangxi and the like, and the total amount of manganese ore resources is proved to reach 13.8 hundred million tons. Although pyrolusite resources are rich in China, the quality of manganese ores is generally poor, and most of manganese ores are low-grade manganese ore deposits, so that the utilization of low-grade manganese oxide ore resources in the fields of metallurgy and chemical industry is limited. The exploration and research of developing environmental engineering materials by utilizing low-grade manganese oxide ore resources have important significance on the application of the manganese ore resources and the improvement of environmental protection technology. From the existing published literature, the research work of synchronous desulfurization and denitrification by wet absorption of flue gas is available at home and abroad, and certain achievements are obtained, such as: in patent CN1843574A, sodium chlorite and an additive are used as a liquid phase absorbent, the additive is one or a combination of calcium hypochlorite, sodium bicarbonate, hydrogen peroxide, disodium hydrogen phosphate or calcium hydroxide, and under the catalysis of the additive, the oxidizability of chlorite and a series of intermediate products is greatly improved, SO is promoted2And NO, thereby greatly improving SO of the absorption liquid2、NOxAnd absorbing with a jet bubble reactor. The patent CN107744715A uses the main product ammonium sulfite in the ammonia desulphurization process as NO and SO2The absorbent of (2) solves the problem that NO is hardly soluble in water by adding CuO as an auxiliary absorbent to an absorbent by a bubbling method, but has the problem of secondary pollution such as ammonia volatilization. CN101574617B patent uses ore pulp prepared by pyrolusite and metal chelating agent as absorbent for SO in coal-fired flue gas2、NOxThe method has the advantages that the method is synchronous in absorption and removal, the metal chelating agent is used for removing polyvalent metal ions such as calcium, magnesium, lead, zinc, iron and the like in pyrolusite slurry, the problem that precipitation and scaling of the metal ions influence desulfurization interface reaction is solved, the mother liquor can utilize poor solubility of manganese sulfate and manganese nitrate at the same temperature after solid-liquid separation, the recycling of sulfur and manganese is realized, the solubility of NO in absorption liquid is not improved, and the problem of low NO removal rate exists.
In the above studies, when a strong oxidizing agent such as sodium chlorite or ozone is used, NO or SO is contained2The removal efficiency is higher, but most of the oxidants are higherExpensive, high investment cost and operation cost, and difficult industrial application; if the cheap absorption liquid such as ammonium sulfite and pyrolusite pulp is used, the NO removal rate is low, generally 60-70%, and the industrial emission standard is difficult to achieve. In view of the above disadvantages, scientific and technical workers in the field of environmental protection need to develop a low-cost and efficient method for synchronously desulfurizing and denitrating wet flue gas.
Disclosure of Invention
In order to avoid the defects of the prior art, the invention provides a device and a method for synchronously desulfurizing and denitrating flue gas, aiming at realizing NO and SO with lower cost2Efficient removal of the active species.
In order to realize the purpose of the invention, the following technical scheme is adopted:
the utility model provides a synchronous SOx/NOx control's of flue gas device which characterized in that: the device comprises at least one flue gas processing unit, wherein a flue gas inlet pipeline is arranged above the flue gas processing unit, and a flue gas outlet pipeline is arranged below the flue gas processing unit;
the smoke processing unit is a plurality of vertically arranged box-shaped plate frames which are arranged in parallel at intervals in a sealed shell; the crack between the box-shaped plate frame and the side wall of the sealed shell and the crack between the adjacent box-shaped plate frames are used as an air inlet crack or an air outlet crack; an air inlet groove is formed in a top plate of the sealing shell above the air inlet crack to ensure that the air inlet crack is communicated with the flue gas inlet pipeline; an air outlet groove is formed in a bottom plate of the sealing shell below the air outlet crack so as to ensure that the air outlet crack is communicated with the flue gas outlet pipeline; the air inlet cracks and the air outlet cracks are alternately arranged along the flowing direction of the flue gas so as to ensure that one side of any box-shaped plate frame is an air inlet crack and the other side of the box-shaped plate frame is an air outlet crack;
the box-shaped plate frame is formed by filling a smoke washing absorption filler in a box-shaped shell, and two side surfaces of the box-shaped shell, which are adjacent to the air inlet crack and the air outlet crack, are of a screen structure;
a spray pipe of the washing absorption liquid atomizer is inserted into an air inlet of the air inlet pipeline and is used for spraying atomized washing absorption liquid into the flue gas to be treated entering through the air inlet pipeline;
and a washing absorption liquid outlet is arranged on the other side of the gas outlet of the flue gas outlet pipeline.
Furthermore, the screen structure is a double-layer screen, the inner side is a latticed fine screen used for ventilating and fixing the flue gas washing absorption filler, and the outer side is a latticed coarse screen used for reinforcing and supporting to prevent the fine screen from bulging and deforming.
Furthermore, the aperture of the grid-shaped fine screen is 0.5-5mm, and the aperture of the grid-shaped coarse screen is 5-50 mm.
Further, the box-shaped plate frame is 10-50cm thick, 1-5m high and 0.5-5m wide; the width of a crack between the box plate frame and the side wall of the sealed shell and a crack between adjacent box plate frames is 2-10 cm.
Furthermore, 5-20 box-shaped plate frames are arranged in one smoke processing unit.
Further, the washing absorption liquid is prepared by the following method: grinding pyrolusite ore into powder which passes through 325 meshes, and then mixing polyethylene glycol, pyrolusite powder and water according to the mass ratio of 1-5: 0-10: 100, preparing into suspension, and adjusting the pH value to 3-6 by using sulfuric acid to obtain the washing absorbent.
Further, the flue gas washing absorption filler is a particulate matter with the particle size of not less than 0.5mm, which is obtained by crushing and screening pyrolusite ore with the manganese oxide content of not less than 60%; or the flue gas washing absorption filler is a filler with high specific area, high porosity and corrosion resistance, such as a filler with the texture of metal, plastic, ceramic, glass fiber and foamed nickel with the stacking porosity of not less than 50 percent.
Further: when the flue gas washing absorption filler is pyrolusite ore particles, the mass ratio of polyethylene glycol, pyrolusite powder and water in the process of preparing washing absorption liquid is 1-5: 0-10: 100, respectively; when other fillers are selected as the flue gas washing absorption filler, the mass ratio of polyethylene glycol, pyrolusite powder and water in the process of preparing washing absorption liquid is 1-5: 5-10: 100.
the method for synchronously desulfurizing and denitrifying the flue gas by using the device comprises the following steps of;
the method comprises the following steps that flue gas to be treated enters from an air inlet of a flue gas inlet pipeline, and washing absorption liquid is sprayed into the flue gas inlet pipeline through a washing absorption liquid atomizer according to the liquid-air volume ratio of the washing absorption liquid to the flue gas to be treated being 1: 200-5000; the flue gas carrying with the atomized washing absorption liquid enters the flue gas treatment unit from the air inlet crack;
atomized washing absorption liquid forms a liquid film on the surface of the flue gas washing absorption filler in the box-shaped plate frame and flows downwards, the flue gas passes through the flue gas washing absorption filler layer and then enters the gas outlet pipeline from the gas outlet crack, and NO and SO in the flue gas2Absorbed by the washing absorption liquid and reacted with manganese oxide in the washing absorption liquid and/or the flue gas washing absorption filler to be converted into nitrate and sulfate to be purified, and the flue gas SO2The removal rate is maintained above 95 percent, NOxThe removal rate is maintained to be more than 80 percent;
the purified flue gas is discharged from a gas outlet of the flue gas outlet pipeline;
after flowing out from the washing absorption liquid outlet, the washing absorption liquid returns to the washing absorption liquid storage tank for recycling; to treat SO in the flue gas2When the removal rate is lower than 80%, the washing absorption liquid is regarded as invalid; and (4) carrying out solid-liquid separation on the invalid washing absorption liquid, discarding solid substances, and evaporating and crystallizing the liquid to obtain manganese sulfate and manganese nitrate byproducts or directly selling the manganese sulfate and manganese nitrate byproducts as raw materials of liquid fertilizers.
Furthermore, if the flue gas washing absorption filler selects pyrolusite ore particles, the filter needs to be replaced periodically, and the specific replacement mode is as follows: to treat SO in the flue gas2When the removal rate is lower than 80% and the efficiency after the washing absorption liquid is replaced does not reach more than 95%, the particles are replaced.
The invention has the beneficial effects that:
1. the invention relates to a device and a method for synchronous desulfurization and denitrification, and SO2The removal rate is maintained to be more than 95 percent, the NO removal rate is maintained to be more than 80 percent, reaction products can be separated and utilized, and the equipment is simple, the operation cost is low, and the method has good prospects.
2. The filling material in the box-shaped plate frame is manganese oxide particles with a porous structure, orThe atomized washing absorption liquid forms a liquid film on the surface of the high-porosity filler and flows from top to bottom under the push of airflow and gravity, and the liquid film is NO and SO in the flue gas2The absorption and the reaction with the manganese oxide provide huge surface area, and the gas is continuously cut and dispersed in the process of passing through the porous medium with irregular pores, so that the gas-liquid absorption rate and the liquid-solid reaction rate are improved, and the flue gas desulfurization and denitrification efficiency is improved.
3. The main medium for converting NO into nitrate in the invention is manganese oxide. The oxidized manganese ore is a natural nano mineral material, has wide source and low price, and has the function of synchronous desulfurization and denitrification as an active material for synchronous desulfurization and denitrification by a wet method. The manganese oxide is a natural oxidant and can oxidize SO in flue gas2Converted to sulfate (equation 1).
MnO2+SO2——Mn2++SO4 2- (1)
Smaller manganese oxide particles, larger specific surface area, and SO2The higher the reactivity, the better the desulfurization effect. Manganese oxides in the manganese oxide ore are mainly nano needle-shaped particles and are coated on the surface of the clay mineral, or the needle-shaped manganese oxide particles form an interwoven structure, so that the pores among the mineral particles are developed, the porosity is high, and the reaction activity is high.
4. Experimental research shows that the polyethylene glycol surfactant added into the washing absorption liquid has weak interaction with NO, so that the solubility of NO in a liquid phase is increased, the dissolution rate of NO is accelerated, and the problem that NO is difficult to dissolve in the absorption process is further solved. The polyethylene glycol in the washing absorption liquid has the function of stabilizing the liquid film, and can prolong the stabilization time of microbubbles and prolong SO in gas2、NOxReaction time with manganese oxide to accelerate SO in gas phase2、NOxMigration to liquid phase, increase of SO2、NOxAnd (4) removing efficiency.
5. The invention discovers that the nano manganese oxide has the functions of autoxidation and catalytic oxidation of NO (equation 2)3), the oxidation product is NO2Due to NO2The solubility is high, and the stable nitrate is very easily converted, and the oxidation of NO accelerates the dissolution of NO in the gas in turn, thereby improving the denitration efficiency.
MnO2+NO——Mn2++NO3 - (2)
NO+O2——NO3 - (3)
6. The device and the method realize synchronous desulfurization and denitrification, are suitable for purifying low-temperature flue gas as long as the temperature of the flue gas reaches 60 ℃ and SO2The removal rate reaches more than 95 percent, the NO purification efficiency reaches more than 80 percent, and the defect of SCR denitration is overcome.
Drawings
FIG. 1 is a cross-sectional view of a synchronous desulfurization and denitrification apparatus for flue gas according to the present invention;
fig. 2 is a cross-sectional view of the box panel frame of the present invention;
reference numbers in the figures: 1 is a flue gas inlet pipeline; 2 is a flue gas outlet pipeline; 3 is a sealed shell; 31 is an air inlet groove; 32 is an air outlet groove; 4 is a box-shaped plate frame; 41 is a flue gas washing absorption filler; 42 is a grid-shaped fine screen; 43 is a mesh-shaped coarse screen; 5 is an air inlet crack; 6 is an air outlet crack; 7 is a washing absorption liquid atomizer; and 8 is a washing absorption liquid outlet.
FIG. 3 is a graph showing the desulfurization and denitrification efficiencies in example 1 as a function of time;
fig. 4 is an image of the high specific surface area, high porosity, corrosion resistant expanded metal filler within the box panel frame of example 2.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, specific embodiments thereof will be described in detail with reference to the following examples. The following is merely exemplary and illustrative of the inventive concept and various modifications, additions and substitutions of similar embodiments may be made to the described embodiments by those skilled in the art without departing from the inventive concept or exceeding the scope of the claims defined thereby.
As shown in fig. 1, the device for synchronous desulfurization and denitrification of flue gas of the present invention comprises at least one flue gas treatment unit, wherein a flue gas inlet pipeline 1 is arranged above the flue gas treatment unit, and a flue gas outlet pipeline 2 is arranged below the flue gas treatment unit;
the flue gas treatment unit is formed by arranging a plurality of vertically arranged box-shaped plate frames 4 at intervals in parallel in a sealed shell 3; the crack between the box-shaped plate frame 4 and the side wall of the sealed shell and the crack between the adjacent box-shaped plate frames are used as an air inlet crack 5 or an air outlet crack 6; an air inlet groove 31 is formed in a top plate of the sealing shell above the air inlet crack 5 so as to ensure that the air inlet crack 5 is communicated with the smoke inlet pipeline 1; an air outlet groove 32 is formed in a bottom plate of the sealing shell below the air outlet crack 6 so as to ensure that the air outlet crack 6 is communicated with the flue gas outlet pipeline 2; the air inlet cracks 5 and the air outlet cracks 6 are alternately arranged along the flowing direction of the flue gas so as to ensure that one side of any box-shaped plate frame is an air inlet crack and the other side of the box-shaped plate frame is an air outlet crack;
as shown in fig. 2, the box plate frame 4 is filled with a flue gas washing absorption filler 41 in a box-shaped housing, and two side surfaces of the box-shaped housing adjacent to the air inlet gap 5 and the air outlet gap 6 are of a screen structure. Specifically, the screen structure is a double-layer screen, the inner side is a grid-shaped fine screen 42 for ventilating and fixing the flue gas washing absorption filler 41, and the outer side is a grid-shaped coarse screen 43 for supporting. More specifically, the mesh-like fine screen 42 has an aperture of 0.5 to 5mm, and the mesh-like coarse screen 43 has an aperture of 5 to 50 mm.
Specifically, the box-shaped plate frame 4 is 10-50cm thick, 1-5m high and 0.5-5m wide (the height is in the vertical direction, the thickness is along the direction parallel to the flue gas inlet and outlet pipelines, and the width is perpendicular to the flue gas inlet and outlet pipelines); the width of a crack between the box plate frame and the side wall of the sealed shell and a crack between adjacent box plate frames is 2-10 cm.
A washing absorption liquid atomizer 7 is arranged, and a spray pipe of the washing absorption liquid atomizer 7 is inserted into an air inlet of the air inlet pipeline 1 and is used for spraying atomized washing absorption liquid into the flue gas to be treated entering through the air inlet pipeline;
and a washing absorption liquid outlet 8 is arranged on the other side of the gas outlet of the flue gas outlet pipeline 2. During specific implementation, the flue gas outlet pipeline 2 is arranged in a downward inclined mode (the inclination angle is 1-2 degrees), so that the washing absorption liquid can be smoothly discharged.
In specific implementation, a washing absorption liquid storage tank can be further arranged and used for storing the washing absorption liquid.
In the specific implementation, 5-20 box-shaped plate frames can be arranged in one smoke treatment unit.
Example 1
The device and the method of the embodiment are used for treating the flue gas of a certain glass kiln, and the flue gas flow rate is 15000Nm3/h。
As shown in FIGS. 1 and 2, in the synchronous desulfurization and denitrification apparatus for flue gas of the present embodiment, the box-shaped plate frame has a thickness of 25cm, a height of 1m and a width of 1 m. And 5 box-shaped plate frames are required to be calculated according to the flow and the designed flow rate, the box-shaped plate frames are placed in the sealed shell in parallel, and the width of a crack between the box-shaped plate frame and the side wall of the sealed shell and a crack between adjacent box-shaped plate frames is 2cm and used as an air inlet crack or an air outlet crack. The box-shaped plate frame is made of a galvanized sheet with the thickness of 1.5mm to form a box-shaped shell, and the two side surfaces of the shell are in a groove shape and are used for welding a latticed fine screen with the aperture of 1mm and a latticed coarse screen with the aperture of 20 mm. A round hole with the diameter of 10cm is formed in the center of the top plate of the box-shaped plate frame and is used for filling and replacing the flue gas washing absorption filler in the later period.
The washing absorbent of this example was prepared as follows: grinding pyrolusite ore into powder which passes through 325 meshes, and then mixing polyethylene glycol, pyrolusite powder and water according to the mass ratio of 3: 5: 100, and adjusting the pH value to 3 with sulfuric acid to obtain washing absorption liquid, and storing the washing absorption liquid in a washing absorption liquid storage tank.
The flue gas washing absorption filler of the embodiment is a particulate matter with the particle size of 1.5-3mm, which is obtained by crushing and screening pyrolusite ore with the manganese oxide content of not less than 60%; wherein the manganese oxide mineral is a nano mineral, and the crystal diameter is less than 90 nm.
When in use: the flue gas to be treated enters from a flue gas inlet pipelineThe gas port enters, and a liquid inlet pipeline of the washing absorption liquid atomizer extracts the washing absorption liquid from the washing absorption liquid storage tank; spraying washing absorption liquid into a flue gas inlet pipeline through a washing absorption liquid atomizer according to the liquid-gas volume ratio of the washing absorption liquid to the flue gas to be treated being 1: 500; the flue gas carrying with the atomized washing absorption liquid enters the flue gas treatment unit from the air inlet crack; atomized washing absorption liquid forms a liquid film on the surface of the flue gas washing absorption filler in the box-shaped plate frame and flows downwards, the flue gas passes through the flue gas washing absorption filler layer and then enters the gas outlet pipeline from the gas outlet crack, and NO and SO in the flue gas2Absorbed by the washing absorption liquid, reacts with manganese oxide in the washing absorption liquid and the flue gas washing absorption filler to be converted into nitrate and sulfate to obtain the purification, and the flue gas analyzer is used for monitoring the temperature of the inlet and the outlet of the flue gas and SO on line2The result of NO concentration shows that when the temperature of the flue gas outlet is maintained to be more than 60 ℃, SO is generated2The removal rate is maintained above 95 percent, NOxThe removal rate was maintained above 80% (as shown in fig. 3).
The purified flue gas is discharged from a gas outlet of the flue gas outlet pipeline;
after flowing out from the washing absorption liquid outlet, the washing absorption liquid returns to the washing absorption liquid storage tank for recycling; to treat SO in the flue gas2When the removal rate is lower than 80%, the washing absorption liquid is regarded as invalid; and (3) carrying out solid-liquid separation on the ineffective washing absorption liquid, discarding solid substances, and evaporating and crystallizing the liquid to obtain manganese sulfate and manganese nitrate byproducts, wherein the specific method refers to patent CN 101574617B.
Example 2
As shown in FIGS. 1 and 2, in the synchronous desulfurization and denitrification apparatus for flue gas of the present embodiment, the box-shaped plate frame has a thickness of 25cm, a height of 1m and a width of 1 m. And 5 box-shaped plate frames are required to be calculated according to the flow and the designed flow rate, the box-shaped plate frames are placed in the sealed shell in parallel, and the width of a crack between the box-shaped plate frame and the side wall of the sealed shell and a crack between adjacent box-shaped plate frames is 2cm and used as an air inlet crack or an air outlet crack. The box-shaped plate frame is made of a plastic film iron plate with the thickness of 1.5mm to form a box-shaped shell, and the two side surfaces of the shell are in a groove shape and are used for welding a latticed fine screen with the aperture of 1mm and a latticed coarse screen with the aperture of 20 mm. After the two screens on one side are welded, filling the Y-shaped metal mesh filler (shown in figure 4) with high specific area, high porosity and corrosion resistance, and welding the two screens on the other side.
The washing absorbent of this example was prepared as follows: selecting pyrolusite ore with manganese oxide content not less than 30%, wherein the manganese oxide ore is nano-mineral, and the crystal diameter is less than 90 nm. Grinding pyrolusite ore into powder which passes through 325 meshes, and then mixing polyethylene glycol, pyrolusite powder and water according to the mass ratio of 2: 10: 100, and adjusting the pH value to 3 with sulfuric acid to obtain washing absorption liquid, and storing the washing absorption liquid in a washing absorption liquid storage tank.
When in use: the flue gas to be treated enters from the gas inlet of the flue gas inlet pipeline, and a liquid inlet pipeline of the washing absorption liquid atomizer extracts washing absorption liquid from a washing absorption liquid storage tank; spraying washing absorption liquid into a flue gas inlet pipeline through a washing absorption liquid atomizer according to the liquid-gas volume ratio of the washing absorption liquid to the flue gas to be treated being 1: 500; the flue gas carrying with the atomized washing absorption liquid enters the flue gas treatment unit from the air inlet crack; atomized washing absorption liquid forms a liquid film on the surface of the flue gas washing absorption filler in the box-shaped plate frame and flows downwards, the flue gas passes through the flue gas washing absorption filler layer and then enters the gas outlet pipeline from the gas outlet crack, and NO and SO in the flue gas2Absorbed by the washing absorption liquid, reacts with manganese oxide in the washing absorption liquid to be converted into nitrate and sulfate to obtain the purification, and the temperature of the inlet and the outlet of the flue gas and SO are monitored on line by a flue gas analyzer2The result of NO concentration shows that when the temperature of the flue gas outlet is maintained to be more than 60 ℃, SO is generated2The removal rate is maintained above 95 percent, NOxThe removal rate is maintained above 80%.
The purified flue gas is discharged from a gas outlet of the flue gas outlet pipeline;
after flowing out from the washing absorption liquid outlet, the washing absorption liquid returns to the washing absorption liquid storage tank for recycling; to treat SO in the flue gas2When the removal rate is lower than 80%, the washing absorption liquid is regarded as invalid; and (4) carrying out solid-liquid separation on the invalid washing absorption liquid, discarding solid matters, and directly selling the liquid as a raw material of the liquid fertilizer.
Claims (7)
1. The utility model provides a synchronous SOx/NOx control's of flue gas device which characterized in that: the device comprises at least one flue gas processing unit, wherein a flue gas inlet pipeline (1) is arranged above the flue gas processing unit, and a flue gas outlet pipeline (2) is arranged below the flue gas processing unit;
the flue gas treatment unit is a plurality of vertically arranged box-shaped plate frames (4) which are arranged in parallel at intervals in a sealed shell (3); the crack between the box-shaped plate frame (4) and the side wall of the sealed shell and the crack between the adjacent box-shaped plate frames are used as an air inlet crack (5) or an air outlet crack (6); an air inlet groove (31) is formed in a top plate of the sealing shell above the air inlet crack (5) so as to ensure that the air inlet crack (5) is communicated with the smoke inlet pipeline (1); an air outlet groove (32) is formed in a bottom plate of the sealing shell below the air outlet crack (6) so as to ensure that the air outlet crack (6) is communicated with the flue gas outlet pipeline (2); the air inlet cracks (5) and the air outlet cracks (6) are alternately arranged along the flowing direction of flue gas so as to ensure that one side of any box-shaped plate frame is an air inlet crack and the other side of any box-shaped plate frame is an air outlet crack;
the box-shaped plate frame (4) is formed by filling a smoke washing absorption filler (41) in a box-shaped shell, and two side faces of the box-shaped shell, which are adjacent to the air inlet crack (5) and the air outlet crack (6), are of a screen structure;
arranging a washing absorption liquid atomizer (7), wherein a spray pipe of the washing absorption liquid atomizer (7) is inserted into an air inlet of the air inlet pipeline (1) and is used for spraying atomized washing absorption liquid into the flue gas to be treated entering through the air inlet pipeline;
a washing absorption liquid outlet (8) is arranged on the other side of the gas outlet of the flue gas outlet pipeline (2);
grinding pyrolusite ore into powder which passes through 325 meshes, and then mixing polyethylene glycol, pyrolusite powder and water according to the mass ratio of 2-3: 5-10: 100, and adjusting the pH value to 3 by using sulfuric acid to obtain washing absorption liquid; the flue gas washing absorption filler is a particulate matter with the particle size of not less than 0.5mm, which is obtained by crushing and screening pyrolusite ore with the manganese oxide content of not less than 60%.
2. The device for synchronously desulfurizing and denitrating flue gas according to claim 1, characterized in that: the screen structure is a double-layer screen, the inner side of the screen is a latticed fine screen (42) used for ventilating and fixing the flue gas washing absorption filler (41), and the outer side of the screen is a latticed coarse screen (43) used for supporting.
3. The device for synchronously desulfurizing and denitrating flue gas according to claim 2, characterized in that: the aperture of the grid-shaped fine screen (42) is 0.5-5mm, and the aperture of the grid-shaped coarse screen (43) is 5-50 mm.
4. The device for synchronously desulfurizing and denitrating flue gas according to claim 1, characterized in that: the box-shaped plate frame (4) is 10-50cm thick, 1-5m high and 0.5-5m wide; the width of a crack between the box plate frame and the side wall of the sealed shell and a crack between adjacent box plate frames is 2-10 cm.
5. The device for synchronously desulfurizing and denitrifying flue gas according to claim 1 or 4, characterized in that: 5-20 box-shaped plate frames (4) are arranged in one smoke processing unit.
6. A synchronous flue gas desulfurization and denitrification method is characterized in that the device of any one of claims 1-5 is used for synchronous flue gas desulfurization and denitrification;
the method comprises the following steps that flue gas to be treated enters from an air inlet of a flue gas inlet pipeline, and washing absorption liquid is sprayed into the flue gas inlet pipeline through a washing absorption liquid atomizer according to the liquid-air volume ratio of the washing absorption liquid to the flue gas to be treated being 1: 200-5000; the flue gas carrying with the atomized washing absorption liquid enters the flue gas treatment unit from the air inlet crack;
atomized washing absorption liquid forms a liquid film on the surface of the flue gas washing absorption filler in the box-shaped plate frame and flows downwards, the flue gas passes through the flue gas washing absorption filler layer and then enters the gas outlet pipeline from the gas outlet crack, and NO and SO in the flue gas2Is absorbed by the washing absorption liquid and washes manganese oxide in the absorption filler with the washing absorption liquid and/or the smokeThe compound is converted into nitrate and sulfate to obtain purified flue gas SO2The removal rate is maintained above 95 percent, NOxThe removal rate is maintained to be more than 80 percent;
the purified flue gas is discharged from a gas outlet of the flue gas outlet pipeline;
after flowing out from the washing absorption liquid outlet, the washing absorption liquid returns to the washing absorption liquid storage tank for recycling; to treat SO in the flue gas2When the removal rate is lower than 80%, the washing absorption liquid is regarded as invalid; and (4) carrying out solid-liquid separation on the invalid washing absorption liquid, discarding solid substances, and evaporating and crystallizing the liquid to obtain manganese sulfate and manganese nitrate byproducts or directly selling the manganese sulfate and manganese nitrate byproducts as raw materials of liquid fertilizers.
7. The method for synchronously desulfurizing and denitrating flue gas according to claim 6, characterized in that: if the flue gas washing absorption filler selects pyrolusite ore particles, treating SO in the flue gas2When the removal rate is lower than 80% and the efficiency after the washing absorption liquid is replaced does not reach more than 95%, the particles are replaced.
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| CN110841426B (en) * | 2019-12-21 | 2024-03-15 | 苏州仕净科技股份有限公司 | Waste gas desulfurization and denitrification treatment device |
| CN115105944A (en) * | 2022-07-05 | 2022-09-27 | 广东风和洁净工程有限公司 | Hollow fiber membrane bed manganese method SOx/NOx control device |
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