CN112337291A - Plasma desulfurization, denitrification and demercuration process - Google Patents
Plasma desulfurization, denitrification and demercuration process Download PDFInfo
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- CN112337291A CN112337291A CN202011147712.8A CN202011147712A CN112337291A CN 112337291 A CN112337291 A CN 112337291A CN 202011147712 A CN202011147712 A CN 202011147712A CN 112337291 A CN112337291 A CN 112337291A
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- 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
- B01D53/26—Drying gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
- B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
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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
- B01D53/005—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 heat treatment
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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
- B01D53/02—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
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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
- B01D53/32—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 electrical effects other than those provided for in group B01D61/00
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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
- B01D53/48—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
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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
- B01D53/54—Nitrogen compounds
- B01D53/56—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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
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Abstract
The invention discloses a plasma desulfurization, denitrification and demercuration process, which belongs to the field of desulfurization and denitrification and comprises the following steps: cooling the waste gas, namely feeding the waste flue gas into a cooling tower, and spraying cooling water to cool the waste gas by the cooling tower; drying and dehydrating the waste gas, namely drying the waste gas cooled in the step I to obtain dried waste gas; performing plasma desulfurization and denitrification treatment on the waste gas, namely introducing the dry waste gas obtained in the step two into a plasma desulfurization and denitrification pump for desulfurization and denitrification; detecting and discharging, namely discharging the products obtained in the step three after passing through an exhaust tower; the process is completed by a plasma desulfurization and denitrification device, which comprises a rack, wherein an exhaust gas drying part and an exhaust gas desulfurization and denitrification part are fixedly mounted on the rack, the exhaust gas drying part is used for drying the exhaust gas treated by a cooling tower, and the exhaust gas desulfurization and denitrification part is used for performing desulfurization and denitrification treatment on the exhaust gas.
Description
Technical Field
The invention belongs to the technical field of desulfurization and denitrification, and particularly relates to a plasma desulfurization, denitrification and demercuration process.
Background
With the continuous expansion of production activities and living activities of human beings, the toxic and harmful substances SO2 and NOx discharged into the environment are increasing, and bring immeasurable harm to the human beings. How to control and reduce the emission of pollutants to the atmosphere until the pollutants are eradicated is a problem which is constantly addressed by environmental workers and chemists.
In any gas with an absolute temperature that is not zero, there is always an ionization of atoms of a certain composition. I.e. charged particles are present in addition to neutral particles. As the concentration of charged particles increases, their effect on the gas properties increases. When the concentration is sufficiently large, the interaction between the positively and negatively charged particles is such that macroscopic electrical neutrality, i.e. zero space charge, is maintained throughout a volume comparable to the gas volume linearity. If accidental factors exist, the electric neutrality is destroyed, so that the positive and negative charges are separated, a strong electric field is caused, and the positive and negative charges move under the action of the electric field. And electrical neutrality is quickly recovered. The ionized gas in this state is called a plasma. Plasma is the fourth state of matter, and the application research of low-temperature plasma in air purification gradually receives wide attention. The low-temperature plasma contains a large amount of active particles, can decompose organic pollutants, kill bacteria, remove suspended solid particles in air and the like at the same time, and is an air purification technology with wide application prospect.
However, the waste gas in the prior art contains a large amount of moisture, and the moisture is combined with the plasma, so that the reaction of the low-temperature plasma and organic pollution in the waste gas is influenced, and the efficiency of waste gas treatment is greatly influenced.
Disclosure of Invention
The invention aims to provide a plasma desulfurization, denitrification and demercuration process, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a plasma desulfurization, denitrification and demercuration process comprises the following steps:
the method comprises the following steps: cooling the waste gas, namely feeding the waste flue gas into a cooling tower, and spraying cooling water to cool the waste gas by the cooling tower;
step two: drying and dehydrating the waste gas, namely drying the waste gas cooled in the step I to obtain dried waste gas;
step three: performing plasma desulfurization and denitrification treatment on the waste gas, namely introducing the dry waste gas obtained in the step two into a plasma desulfurization and denitrification pump for desulfurization and denitrification;
step four: detecting and discharging, namely discharging the products obtained in the step three after passing through an exhaust tower;
the process for removing sulfur, nitrogen and mercury from the waste gas comprises a first step, a second step, a third step, a fourth step, a fifth step and a sixth step, wherein the first step, the second step and the fourth step are carried out by a plasma sulfur, nitrogen and mercury removal device.
The preferred scheme in the invention is as follows: the frame is the rectangular frame structure, the frame includes upper bracket and under bracing frame, connect fixedly through the support column between upper bracket and the under bracing frame, open the top of upper bracket has a plurality of mounting holes, the multiunit universal wheel is installed to the below of under bracing frame.
The preferred scheme in the invention is as follows: the waste gas drying part comprises a support, a drying box body is fixedly mounted on one side below the support through bolts, an air blower is arranged on one side of the drying box body and comprises an air inlet and an air outlet, an air inlet pipeline is connected to the air inlet, and a first pipeline is connected to the air outlet;
the first pipeline comprises a pipeline section a and a pipeline section b, the one end of the pipeline section a is connected with the gas outlet in a sealing mode through a flange, the other end of the pipeline section a is communicated with one side of the bottom of the drying box body, the pipeline section b is communicated with the upper end of the drying box body, the upper end of the pipeline section b is connected with the four-way box body, the top of the four-way box body is communicated with three groups of second pipelines and a group of detection pipelines, and the other end of each second pipeline is communicated with a filtering device.
The preferred scheme in the invention is as follows: the filter equipment comprises a shell, the shell is installed and fixed on the inner side of the upper portion of the support, two groups of partition plates are arranged inside the shell and divide the inside of the shell into three spaces, three groups of partition plates are arranged on the inner side of the upper portion of the shell, the other ends of the second pipelines are communicated with the upper portion of the shell through flanges, the three groups of second pipelines are communicated with the three spaces respectively, three open grooves are formed in the side face of the shell and are three, filter screen plates are inserted into the open grooves respectively, an outlet pipe is connected to the lower portion of the shell, and the other end of the outlet pipe is connected with the waste.
The preferred scheme in the invention is as follows: the drying box body comprises a control cabinet and a drying box, the control cabinet is installed below the drying box, a heating resistance wire is fixedly installed on the inner wall of the drying box, an exhaust hole is formed in the upper portion of the drying box, an exhaust valve is installed in the exhaust hole, and the heating resistance wire is electrically connected with the control cabinet.
The preferred scheme in the invention is as follows: the shape of cross box is the toper, sealed through the clamp between pipeline section b, three group second pipelines and a set of detection pipeline and the cross box.
The preferred scheme in the invention is as follows: the waste gas desulfurization and denitration portion comprises a cylindrical shell, a corona discharge plasma generator is arranged inside the lower portion of the cylindrical shell, the corona discharge plasma generator is annularly arranged inside the cylindrical shell, an air inlet end is connected to one side of the lower portion of the cylindrical shell, the air inlet end extends to the inside of the cylindrical shell, and a splitter disc is arranged at the end portion of the air inlet end.
The preferred scheme in the invention is as follows: the inside of cylinder casing is provided with sealed baffle, sealed baffle falls into two spaces with the cylinder casing, corona discharge plasma generator installs the space in sealed baffle one side, the space of sealed baffle opposite side is provided with the liquid reserve tank, the inside storage of liquid reserve tank has the doctor solution, the top and the below intercommunication that the side of cylinder casing is located sealed baffle have the air duct, the top of cylinder casing is provided with the blast pipe.
The invention has the beneficial effects that:
1. the air inlet of the blower is connected with the air inlet pipeline, the air inlet pipeline is connected with the exhaust pipeline after cooling of the cooling tower, the blower blows waste gas from the air inlet to the air outlet and then is introduced into the drying box body, the drying box body can dry the waste gas and then introduce the waste gas into the four-way box body, the four-way box body divides the waste gas and introduces the waste gas into the filtering device for filtering, three groups of second pipelines respectively introduce the waste gas into three spaces in the shell body, filtering screen plates are respectively arranged in the three spaces, a layer of active carbon adsorption layer is laid on each filtering screen plate and can further adsorb and filter moisture in the waste gas, ball valves are respectively arranged on the three groups of second pipelines and can respectively control the three groups of second pipelines to respectively introduce the waste gas into the filtering device, when the filtering screen plates need to be replaced, only need will correspond the ball valve that filters on the otter board and close, two other second pipelines carry out work, do not influence filter equipment's filtration waste gas, need not shut down and change and filter the otter board, improve the practicality of device greatly.
2. According to the invention, the control cabinet can control the work of the heating resistance wire in the drying box, the heating resistance wire can heat the space in the drying box, then the waste gas is heated, the moisture in the waste gas is evaporated, and then the waste gas is discharged through the exhaust hole, so that the content of the moisture in the waste gas is reduced.
3. According to the invention, the corona discharge plasma generator can generate a large amount of low-temperature plasma, the low-temperature plasma is combined with the waste gas introduced from the gas inlet end, the low-temperature plasma oxidizes nitric oxide in the waste gas to form nitrogen dioxide, then the flue gas is in countercurrent contact with a denitration absorbent solution in an absorption tower, the nitrogen dioxide is rapidly absorbed, and the aim of denitration is achieved.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic top view of the exhaust gas drying section of the present invention;
FIG. 3 is a side view of the exhaust gas drying section of the present invention;
FIG. 4 is a schematic view of the filter apparatus of the present invention;
FIG. 5 is a schematic view of the structure of the drying box of the present invention;
FIG. 6 is a schematic view of the structure of an apparatus for desulfurization and denitrification of exhaust gas according to the present invention.
In the figure: 1. a frame; 11. an upper support frame; 12. a lower support frame; 13. a support pillar; 14. mounting holes; 15. a universal wheel; 2. an exhaust gas drying section; 21. a support; 22. drying the box body; 221. a control cabinet; 222. a drying box; 223. heating resistance wires; 224. an exhaust hole; 225. an exhaust valve; 23. a blower; 231. an air inlet; 232. an air outlet; 233. an air intake duct; 234. a first conduit; 2341. a pipe section a; 2342. a pipe section b; 235. a four-way box body; 236. a second conduit; 237. detecting a pipeline; 238. a filtration device; 2381. a housing; 2382. a partition plate; 2383. an open slot; 2384. a filter screen plate; 2385. an air outlet pipe; 3. a flue gas desulfurization and denitrification section; 31. a cylindrical housing; 311. sealing the partition plate; 312. a liquid storage tank; 313. an air duct; 314. an exhaust pipe; 32. a corona discharge plasma generator; 33. an air inlet end; 34. and a diverter disc.
Detailed Description
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Referring to the attached fig. 1-6, a plasma desulfurization, denitrification and demercuration process comprises the following steps:
the method comprises the following steps: cooling the waste gas, namely feeding the waste flue gas into a cooling tower, and spraying cooling water to cool the waste gas by the cooling tower;
step two: drying and dehydrating the waste gas, namely drying the waste gas cooled in the step I to obtain dried waste gas;
step three: performing plasma desulfurization and denitrification treatment on the waste gas, namely introducing the dry waste gas obtained in the step two into a plasma desulfurization and denitrification pump for desulfurization and denitrification;
step four: detecting and discharging, namely discharging the products obtained in the step three after passing through an exhaust tower;
the process for removing sulfur, nitrogen and mercury from the waste gas comprises the steps from the first step to the fourth step, wherein the process of removing sulfur, nitrogen and mercury from the waste gas is completed by a plasma sulfur, nitrogen and sulfur removal device, the device comprises a frame 1, a waste gas drying part 2 and a waste gas sulfur, nitrogen and sulfur removal part 3 are fixedly mounted on the frame 1, the waste gas drying part 2 is used for drying the waste gas treated by a cooling tower, and the waste gas sulfur, nitrogen and sulfur removal part 3 is used for performing sulfur, nitrogen and sulfur removal treatment on the waste gas.
In a further embodiment, the exhaust gas treated by the exhaust gas desulfurization and denitration unit 3 is discharged after passing the detection, and if the detection is not qualified, the exhaust gas is further circularly treated and is introduced into the exhaust gas desulfurization and denitration unit 3 for treatment until the exhaust gas is discharged after passing the detection.
Specifically, referring to fig. 1, the frame 1 is a rectangular frame structure, the frame 1 includes an upper support frame 11 and a lower support frame 12, the upper support frame 11 and the lower support frame 12 are connected and fixed through a support column 13, a plurality of mounting holes 14 are formed above the upper support frame 11, and a plurality of sets of universal wheels 15 are installed below the lower support frame 12.
In a further embodiment, the upper support frame 11, the lower support frame 12 and the support column 13 are fixed and installed through bolts, the rack 1 is arranged to support the whole device, and the plurality of installation holes 14 are formed to facilitate fixing of the device on the rack 1.
Specifically, referring to fig. 1, 2 and 3, the exhaust gas drying part 2 includes a support 21, a drying box 22 is fixedly mounted on one side of the lower portion of the support 21 through bolts, a blower 23 is disposed on one side of the drying box 22, the blower 23 includes an air inlet 231 and an air outlet 232, the air inlet 231 is connected with an air inlet pipeline 233, and the air outlet 232 is connected with a first pipeline 234; the first pipeline 234 comprises a pipeline section a2341 and a pipeline section b2342, one end of the pipeline section a2341 is in flange sealing connection with the air outlet 232, the other end of the pipeline section a2341 is communicated with one side of the bottom of the drying box body 22, the pipeline section b2342 is communicated with the upper end of the drying box body 22, the upper end of the pipeline section b2342 is connected with a four-way box body 235, three groups of second pipelines 236 and one group of detection pipelines 237 are communicated above the four-way box body 235, and the other ends of the three groups of second pipelines 236 are communicated with a filtering device 238.
In a further embodiment, the air inlet 231 of the blower 23 is connected to the air inlet pipe 233, the air inlet pipe 233 is connected to the exhaust pipe cooled by the cooling tower, the blower 23 blows the exhaust gas from the air inlet 231 to the air outlet 232, and then the exhaust gas is introduced into the drying box 22, the drying box 22 may dry the exhaust gas, and then the exhaust gas is introduced into the four-way box 235, and the four-way box 235 shunts the exhaust gas and introduces the exhaust gas into the filtering device 238 for filtering.
Specifically, please refer to fig. 4, the filtering apparatus 238 includes a casing 2381, the casing 2381 is installed and fixed on the inner side of the upper portion of the support 21, two sets of partition plates 2382 are arranged inside the casing 2381, the two sets of partition plates 2382 divide the inside of the casing 2381 into three spaces, the other ends of the three sets of second pipes 236 are communicated with the upper portion of the casing 2381 through flanges, the three sets of second pipes 236 are respectively communicated with the three spaces, three open grooves 2383 are opened on the side surface of the casing 2381, three filter screen plates 2384 are respectively inserted into the open grooves 2383, an air outlet pipe 2385 is connected to the lower portion of the casing 2381, and the other end of the air outlet pipe 2385 is connected with the waste gas desulfurization and denitrification portion 3.
In a further embodiment, three groups of second pipelines 236 guide into three spaces in casing 2381 respectively with waste gas, be provided with filter screen 2384 in three spaces respectively, filter screen 2384 upper berth is equipped with one deck active carbon adsorption layer, active carbon adsorption layer can further adsorb the filtration to the moisture in the waste gas, install the ball valve on three groups of second pipelines 236 respectively, the ball valve can control three groups of second pipelines 236 respectively and let in waste gas to filter equipment 238 respectively, adopt this kind of filtering method, when needing to change filter screen 2384, only need to close the ball valve that will correspond on the filter screen 2384, two other second pipelines 236 work, do not influence the filtration waste gas of filter equipment 238, do not need to shut down and change filter screen 2384, improve the practicality of device greatly.
Specifically, referring to fig. 5, the drying box 22 includes a control cabinet 221 and a drying box 222, the control cabinet 221 is installed below the drying box 222, a heating resistance wire 223 is fixedly installed on an inner wall of the drying box 222, an exhaust hole 224 is formed above the drying box 222, an exhaust valve 225 is installed in the exhaust hole 224, and the heating resistance wire 223 is electrically connected to the control cabinet 221.
In a further embodiment, the control cabinet 221 may control the operation of the heating resistance wire 223 in the drying box 222, the heating resistance wire 223 may heat the space in the drying box 222, and then heat the exhaust gas, so that the moisture in the exhaust gas is evaporated and then discharged through the exhaust hole 224, thereby reducing the moisture content in the exhaust gas.
Specifically, referring to fig. 1, the four-way box 235 is tapered, and the pipe segment b2342, the three groups of second pipes 236, and the group of detection pipes 237 are sealed with the four-way box 235 by clips.
In a further embodiment, the four-way box 235 is arranged to facilitate the diversion of the exhaust gas treated by the drying box 22, thereby improving the operation efficiency of the device.
Specifically, referring to fig. 6, the exhaust gas desulfurization and denitration portion 3 includes a cylindrical housing 31, a corona discharge plasma generator 32 is installed inside the lower portion of the cylindrical housing 31, the corona discharge plasma generator 32 is installed inside the cylindrical housing 31 in an annular shape, an air inlet 33 is connected to one side of the lower portion of the cylindrical housing 31, the air inlet 33 extends into the cylindrical housing 31, and a splitter plate 34 is disposed at an end portion of the air inlet 33.
In a further embodiment, the corona discharge plasma generator 32 may generate a large amount of low temperature plasma, the low temperature plasma is combined with the exhaust gas introduced from the gas inlet 33, the low temperature plasma oxidizes the nitric oxide in the exhaust gas to form nitrogen dioxide, then the flue gas is in countercurrent contact with the denitration absorbent solution in the absorption tower, the nitrogen dioxide is rapidly absorbed, the purpose of denitration is achieved, the sulfur dioxide in the exhaust gas is activated and reacted with a large amount of electrons, ions and free radicals, the purpose of desulfurization is achieved, and the chemical reaction formula in the reaction is as follows:
CO(NH2)2+SO2+2H 20＝(NH4)2SO3+2CO2
CO(NH2)2+SO2+2H 20+1/202＝(NH4)2S04+2CO2
H2SO4+Ca(OH)2＝CaS04+2H 20
SO2+H2O＝H2SO3
SO2+H 20+1/202＝H2SO4
H2SO4+Ca(OH)2＝CaSO4+2H 20
specifically, referring to fig. 6, a sealing partition 311 is disposed inside the cylindrical housing 31, the sealing partition 311 divides the cylindrical housing 31 into two spaces, the corona discharge plasma generator 32 is mounted in the space on one side of the sealing partition 311, a liquid storage tank 312 is disposed in the space on the other side of the sealing partition 311, a doctor solution is stored in the liquid storage tank 312, gas tubes 313 are communicated with the sides of the cylindrical housing 31 above and below the sealing partition 311, and a gas discharge tube 314 is disposed above the cylindrical housing 31.
In a further embodiment, after the corona discharge plasma generator 32 treats the exhaust gas, the gas is introduced into the liquid storage tank 312 through the gas guide tube 313, and a urea treatment liquid is stored in the liquid storage tank 312, and the urea treatment liquid further treats the gas, so that the exhaust gas reaches the emission standard.
The working principle and the using process of the invention are as follows: starting the blower 23, wherein an air inlet 231 of the blower 23 is connected with an air inlet pipeline 233, the air inlet pipeline 233 is connected with an exhaust pipeline after cooling of the cooling tower, the blower 23 blows exhaust gas from the air inlet 231 to an air outlet 232 and then to the drying box 22, the drying box 22 can dry the exhaust gas and then to the four-way box 235, the four-way box 235 shunts the exhaust gas to a filtering device 238 for filtering, three groups of second pipelines 236 respectively guide the exhaust gas to three spaces in a casing 2381, filtering screen plates 2384 are respectively arranged in the three spaces, a layer of activated carbon adsorption layer is laid on the filtering screen plates 2384, the activated carbon adsorption layer can further adsorb and filter moisture in the exhaust gas, ball valves are respectively arranged on the three groups of second pipelines 236, the ball valves can respectively control the three groups of second pipelines 236 to respectively feed the exhaust gas to the filtering device 238, by adopting the filtering mode, when the filter screen plate 2384 needs to be replaced, only the ball valve on the corresponding filter screen plate 2384 needs to be closed, the other two second pipelines 236 work, the waste gas filtering of the filtering device 238 is not affected, the filter screen plate 2384 does not need to be stopped to be replaced, the practicability of the device is greatly improved, the control cabinet 221 can control the work of the heating resistance wire 223 in the drying box 222, the heating resistance wire 223 can heat the space in the drying box 222, then the waste gas is heated, the moisture in the waste gas is evaporated and then is discharged through the exhaust hole 224, the moisture content in the waste gas is reduced, the corona discharge plasma generator 32 can generate a large amount of low-temperature plasma, the low-temperature plasma is combined with the waste gas introduced from the gas inlet end 33, the low-temperature plasma oxidizes the nitric oxide in the waste gas to nitrogen dioxide, then the flue gas is contacted with the denitration absorbent solution in the countercurrent absorption tower, the nitrogen dioxide is absorbed rapidly, the purpose of denitration is achieved, sulfur dioxide in the waste gas is activated and reacts with a large amount of electrons, ions and free radicals, the purpose of desulfuration is achieved, the waste gas is treated by the corona discharge plasma generator 32, then the gas is guided into the liquid storage tank 312 through the gas guide pipe 313, urea treatment liquid is stored in the liquid storage tank 312, the gas is further treated by the urea treatment liquid, and therefore the waste gas reaches the emission standard.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (8)
1. A plasma desulfurization, denitrification and demercuration process is characterized by comprising the following steps:
the method comprises the following steps: cooling the waste gas, namely feeding the waste flue gas into a cooling tower, and spraying cooling water to cool the waste gas by the cooling tower;
step two: drying and dehydrating the waste gas, namely drying the waste gas cooled in the step I to obtain dried waste gas;
step three: performing plasma desulfurization and denitrification treatment on the waste gas, namely introducing the dry waste gas obtained in the step two into a plasma desulfurization and denitrification pump for desulfurization and denitrification;
step four: detecting and discharging, namely discharging the products obtained in the step three after passing through an exhaust tower;
the process for removing sulfur, nitrogen and mercury from the waste gas comprises the first step, the second step and the third step, wherein the process of removing sulfur, nitrogen and mercury from the waste gas is completed by a plasma sulfur, nitrogen and sulfur removal device which comprises a frame (1), a waste gas drying part (2) and a waste gas sulfur, nitrogen and sulfur removal part (3) are fixedly mounted on the frame (1), the waste gas drying part (2) is used for drying the waste gas treated by a cooling tower, and the waste gas sulfur, nitrogen and sulfur removal part (3) is used for performing sulfur, nitrogen and sulfur removal treatment on the waste gas.
2. The plasma desulfurization, denitrification and demercuration process according to claim 1, characterized in that: frame (1) is the rectangle frame construction, frame (1) includes upper bracket (11) and lower carriage (12), it is fixed to connect through support column (13) between upper bracket (11) and lower carriage (12), open the top of upper bracket (11) has a plurality of mounting holes (14), multiunit universal wheel (15) are installed to the below of lower carriage (12).
3. The plasma desulfurization, denitrification and demercuration process according to claim 1, characterized in that: the waste gas drying part (2) comprises a support (21), a drying box body (22) is fixedly installed on one side below the support (21) through bolts, an air blower (23) is arranged on one side of the drying box body (22), the air blower (23) comprises an air inlet (231) and an air outlet (232), the air inlet (231) is connected with an air inlet pipeline (233), and the air outlet (232) is connected with a first pipeline (234);
first pipeline (234) include pipeline section a (2341) and pipeline section b (2342), flange sealing connection between the one end of pipeline section a (2341) and gas outlet (232), the other end and the dry box (22) bottom one side of pipeline section a (2341) communicate each other, pipeline section b (2342) and the upper end intercommunication of dry box (22), the upper end of pipeline section b (2342) is connected with cross box (235), the top intercommunication of cross box (235) has three groups of second pipeline (236) and a set of detection pipeline (237), three groups the other end intercommunication of second pipeline (236) has filter equipment (238).
4. The plasma desulfurization, denitrification and demercuration process according to claim 3, wherein: filter equipment (238) includes casing (2381), casing (2381) installation is fixed inboard in the top of support (21), the inside of casing (2381) is provided with two sets of baffle (2382), and is two sets of baffle (2382) divide into three space with the inside of casing (2381), and is three the other end of second pipeline (236) with the flange intercommunication is passed through to the top of casing (2381), and three second pipeline (236) of group communicate with three space respectively, open the side of casing (2381) has three open slot (2383), and is three it has filter plate (2384) to peg graft respectively in open slot (2383), the below of casing (2381) is connected with outlet duct (2385), be connected between the other end of outlet duct (2385) and waste gas desulfurization denitration portion (3).
5. The plasma desulfurization, denitrification and demercuration process according to claim 3, wherein: the drying box body (22) comprises a control cabinet (221) and a drying box (222), the control cabinet (221) is installed below the drying box (222), heating resistance wires (223) are fixedly installed on the inner wall of the drying box (222), an exhaust hole (224) is formed in the upper portion of the drying box (222), an exhaust valve (225) is installed in the exhaust hole (224), and the heating resistance wires (223) are electrically connected with the control cabinet (221).
6. The plasma desulfurization, denitrification and demercuration process according to claim 3, wherein: the shape of cross box (235) is the toper, pass through the clamp sealed between pipeline section b (2342), three second pipelines of group (236) and a set of detection pipeline (237) and cross box (235).
7. The plasma desulfurization, denitrification and demercuration process according to claim 4, wherein: exhaust gas desulfurization denitration portion (3) include cylinder casing (31), the below internally mounted of cylinder casing (31) has corona discharge plasma generator (32), corona discharge plasma generator (32) are the annular and install the inside at cylinder casing (31), below one side of cylinder casing (31) is connected with inlet end (33), inlet end (33) extend to the inside of cylinder casing (31), and the tip of inlet end (33) is provided with flow distribution disc (34).
8. The plasma desulfurization, denitrification and demercuration process according to claim 7, wherein: the inside of cylinder casing (31) is provided with sealed baffle (311), sealed baffle (311) fall into two spaces with cylinder casing (31), corona discharge plasma generator (32) install the space in sealed baffle (311) one side, the space of sealed baffle (311) opposite side is provided with liquid reserve tank (312), the inside storage of liquid reserve tank (312) has the doctor solution, the side of cylinder casing (31) is located the top and the below intercommunication of sealed baffle (311) has air duct (313), the top of cylinder casing (31) is provided with blast pipe (314).
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Application publication date: 20210209 |