CN111495140A - Integrated flue gas desulfurization and denitrification reaction device and process - Google Patents
Integrated flue gas desulfurization and denitrification reaction device and process Download PDFInfo
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- CN111495140A CN111495140A CN202010348357.4A CN202010348357A CN111495140A CN 111495140 A CN111495140 A CN 111495140A CN 202010348357 A CN202010348357 A CN 202010348357A CN 111495140 A CN111495140 A CN 111495140A
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- 239000003546 flue gas Substances 0.000 title claims abstract description 155
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 153
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 91
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 36
- 230000023556 desulfurization Effects 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 70
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011593 sulfur Substances 0.000 claims abstract description 10
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 239000002826 coolant Substances 0.000 claims description 32
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 28
- 239000007789 gas Substances 0.000 claims description 27
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 23
- 238000007599 discharging Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 239000003513 alkali Substances 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000000779 smoke Substances 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 11
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- PFRUBEOIWWEFOL-UHFFFAOYSA-N [N].[S] Chemical compound [N].[S] PFRUBEOIWWEFOL-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- -1 ammonium ions Chemical class 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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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
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/106—Peroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of environmental protection, in particular to a reaction device and a process for integrated desulfurization and denitrification of flue gas, which comprises a shell, wherein a reaction chamber is arranged in the shell, a cooling chamber is arranged between the shell and the reaction chamber, the bottom of the reaction chamber is provided with a flue gas inlet, the top of the reaction chamber is provided with a flue gas outlet, a plurality of flow baffles are arranged on the inner wall of the reaction chamber, a cooling pipe is arranged inside the reaction chamber, the bottom of the reaction chamber is also connected with an ozone inlet structure, the air inlet of the reaction chamber is provided with a temperature sensor, the temperature sensor is contacted with the flue gas, the temperature sensor is connected with a controller, the controller is connected with a flue gas inlet valve and a flue gas outlet valve, the flue gas outlet is connected with a sulfur and nitrogen detection sensor, and the sulfur; the desulfurization efficiency of the invention is as high as 98.3, the denitration efficiency is as high as 94.5, the process is simple, and secondary pollution such as ammonia gas leakage and the like can not occur in the treatment process.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a reaction device and a process for integrated desulfurization and denitrification of flue gas.
Background
The industrial development promotes the social progress and also causes serious damage to the environment, wherein carbon dioxide discharged by industrial fuel is a main substance causing greenhouse effect, and sulfur-containing nitrogen oxides cause serious atmospheric pollution, so that the flue gas must be subjected to desulfurization and denitrification treatment before being discharged.
The existing desulfurization and denitrification methods generally adopt limestone-gypsum desulfurization and SCR (selective catalytic reduction) denitrification technologies, or ammonia desulfurization and SCR technologies. Still another is ammonia process desulfurization and denitration integrated technology, and the principle of the technology is as follows: SO in flue gas2NOx is acid gas, ammonia water is alkaline liquid, the NOx and the ammonia water are subjected to chemical reaction under certain conditions, and the ammonia water absorbs SO in flue gas2NOx to generate sulfite and nitrate solution, and the desulfurization part utilizes the high-temperature flue gas in the original flue to carry out concentration and crystallization. The denitration part utilizes an oxidant to react with NOx to generate ammonium nitrate, the ammonium nitrate is concentrated and crystallized through high-temperature flue gas, crystals are separated from mother liquor, and then a mixture of ammonium sulfate and ammonium nitrate (namely a compound fertilizer) is finally produced through cyclone, separation, drying and packaging.
However, liquid ammonia is a volatile substance, certain ammonia diffusion exists in the desulfurization process, secondary pollution can be caused when diffused ammonia enters the environment, certain damping effect can be caused to the oxidation of ammonium sulfite by ammonium ions with too high concentration, and the difficulty of system oxidation and crystallization is increased.
Disclosure of Invention
The purpose of the invention is: overcomes the defects in the prior art, and provides the reaction device for integrated desulfurization and denitrification of the flue gas, which has high efficiency of sulfur and nitrogen removal and simple structure. Another object of the invention is: the integrated desulfurization and denitrification process for the flue gas is simple, environment-friendly in process and free of secondary pollution.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a reaction device for integrated desulfurization and denitrification of flue gas comprises a shell, wherein a reaction chamber is arranged in the shell, a cooling chamber is arranged between the shell and the reaction chamber, the top and the bottom of the cooling chamber are respectively provided with a first cooling medium inlet and a first cooling medium outlet, the bottom of the reaction chamber is provided with a flue gas inlet, the top of the reaction chamber is provided with a flue gas outlet, the inner wall of the reaction chamber is provided with a plurality of flow baffles, the inside of the reaction chamber is provided with a cooling pipe, the two ends of the cooling pipe are respectively provided with a second cooling medium inlet and a second cooling medium outlet, the bottom of the reaction chamber is also connected with an ozone inlet structure, an air inlet of the reaction chamber is provided with a temperature sensor, the temperature sensor is in contact with the flue gas, the temperature sensor is connected with a controller, the controller is connected with a flue gas inlet valve and a flue gas outlet valve, and the sulfur and nitrogen detection sensor is connected with the controller.
Further, ozone inlet structure includes house steward and branch pipe, the branch pipe includes branch pipe one and branch pipe two that differ in size, and the gas outlet of long tube is located the half department of reaction chamber height, and the gas outlet of nozzle stub is located the fifth department of reaction chamber height.
Furthermore, the first branch pipe and the second branch pipe are respectively connected with a first flow regulating valve and a second flow regulating valve.
Further, the cooling pipe comprises a straight pipe section and a coil pipe section, and the coil pipe section is located at the flue gas inlet end.
Furthermore, the flow baffle plates are in a semicircular ring shape, the plurality of flow baffle plates are divided into two rows and arranged on the inner wall of the reaction chamber, and the two rows of flow baffle plates are alternately arranged.
Furthermore, one end of the flow baffle, which is far away from the inner wall of the reaction chamber, faces the flue gas inlet, and the included angle between the flow baffle and the inner wall of the reaction chamber is 30-45 degrees.
Further, the surface coating that keeps off and flows the board has one deck acid corrosion resistant coating, keep off and flow and be connected through fixed slot and splint between the indoor wall of reaction chamber, be provided with semicircle annular fixed slot on the indoor wall of reaction chamber, the rip cutting that keeps off and flow the board is the V font, including the arcwall face and the inclined plane of vertical setting, during the installation, the arcwall face inserts in the fixed slot, and outside its bottom stretched out the fixed slot and fixed the below at the fixed slot through splint.
A flue gas integrated desulfurization and denitrification process comprises the following steps:
(1) firstly, enabling flue gas to pass through a hydrogen peroxide spray tower, then enabling the flue gas to enter a reaction chamber through a flue gas inlet, detecting the temperature of the flue gas by a temperature sensor in the flue gas inlet, transmitting the temperature value to a controller, adjusting the opening and closing of a cooling chamber and cooling media in a cooling pipe and controlling the flow rate of the cooling media to be lower than 180 ℃ according to the detected temperature of the flue gas;
(2) opening an ozone inlet valve, opening an inlet valve on a branch pipe with a short length, and then opening an inlet valve on a branch pipe with a longer length;
(3) the smoke outlet is connected with the gas component at the smoke outlet end of the gas detection sensor, the detection data is transmitted to the controller, and the controller adjusts the opening and closing of the outlet valve according to the detection result;
(4) and discharging the treated flue gas into an absorption tower, further absorbing by adopting alkali liquor and hydrogen peroxide respectively, and discharging the flue gas after meeting the discharge standard.
Further, the molar ratio of the ozone to the nitric oxide is 0.9-1.
Further, the cooling medium in the cooling chamber and the cooling pipe adopts water or water vapor, and the flow direction of the cooling medium is opposite to that of the flue gas.
The technical scheme adopted by the invention has the beneficial effects that:
1. according to the invention, the flue gas temperature is detected by the temperature sensor, the closing of the flue gas inlet valve is controlled, and the closing of the flue gas outlet valve is adjusted by detecting the sulfur and nitrogen content in the reaction chamber of the sensor by the gas, so that the operation efficiency and precision are improved. The cooling chamber and the cooling pipe are respectively arranged inside and outside the reaction chamber, so that the temperature in the reaction chamber can be stably controlled below 150 ℃, the decomposition rate of ozone is reduced, the oxidation efficiency of NOx is improved, and the denitrification efficiency is improved.
2. The cooling pipe comprises a straight pipe section and a coil pipe section, the coil pipe section is positioned at the flue gas inlet end, the structural design is adopted, the contact area between the flue gas at the flue gas inlet and a cooling medium is increased, the flue gas temperature at the flue gas inlet side can be quickly reduced, only one section of the cooling pipe adopts the coil pipe section, the volume of a reaction chamber cannot be reduced, and under the condition that the volumes of the reaction chambers are equal, the cooling pipe is adopted, so that the treatment capacity of the reaction chamber on the flue gas can be increased, and the treatment cost is reduced.
3. The desulfurization efficiency of the invention is as high as 98.3, the denitration efficiency is as high as 94.5, the process is simple, and secondary pollution such as ammonia gas leakage and the like can not occur in the treatment process.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein,
in the figure: FIG. 1 is a schematic structural diagram of an integrated desulfurization and denitrification reaction device in the present invention.
In the figure: the device comprises a shell 1, a cooling chamber 2, a first cooling medium inlet 201, a first cooling medium outlet 202, a reaction chamber 3, a flue gas inlet 301, a flue gas outlet 302, a cooling pipe 4, a second cooling medium inlet 401, a second cooling medium outlet 402, an ozone inlet structure 5, a flow regulating valve 6 and a flow baffle 7.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention. The present invention is described in detail by using schematic structural diagrams and the like, which are only examples and should not limit the protection scope of the present invention. In addition, the actual fabrication process should include three-dimensional space of length, width and depth.
Example 1
Referring to fig. 1, a flue gas integrated desulfurization and denitrification reaction device comprises a shell 1, a reaction chamber 3 is arranged in the shell 1, a cooling chamber 2 is arranged between the shell 1 and the reaction chamber 3, a first cooling medium inlet 201 and a first cooling medium outlet 202 are respectively arranged at the top and the bottom of the cooling chamber 2, a flue gas inlet 301 is arranged at the bottom of the reaction chamber 3, a flue gas outlet 302 is arranged at the top of the reaction chamber, a plurality of flow baffles 7 are arranged on the inner wall of the reaction chamber 3, the flow baffles 7 are structurally designed to effectively block the flow of flue gas and ozone, so that the contact time between the flue gas and the ozone is prolonged, the oxidation efficiency of NOx is improved, a cooling pipe 4 is arranged in the reaction chamber 3, two ends of the cooling pipe 4 are respectively a second cooling medium inlet 401 and a second cooling medium outlet 402, an ozone inlet structure 5 is further connected to the bottom of the reaction chamber 3, and a temperature sensor is arranged at an air, the temperature sensor contacts with the flue gas, and the temperature sensor is connected with the controller, and the controller is connected with flue gas inlet 301 valve and exhanst gas outlet 302 valve, is connected with the sulphur nitrogen on the exhanst gas outlet 302 and detects the sensor, and the sulphur nitrogen detects the sensor and is connected with the controller. The flue gas temperature is detected through the temperature sensor, the closing of the flue gas inlet 301 valve is controlled, the sulfur and nitrogen content in the reaction chamber 3 of the gas detection sensor is used for adjusting the closing of the flue gas outlet 302 valve, and the operation efficiency and precision are improved.
In this embodiment, the cooling chamber 2 and the cooling pipe 4 are respectively provided inside and outside the reaction chamber 3, and the temperature inside the reaction chamber 3 can be stably controlled to 150 ℃ or lower, thereby reducing the decomposition rate of ozone, improving the oxidation efficiency of NOx, and improving the denitrification efficiency.
The ozone inlet structure 5 comprises a header pipe and branch pipes, the branch pipes comprise a first branch pipe and a second branch pipe which are different in length, the gas outlet of the long pipe is positioned at one half of the height of the reaction chamber 3, and the gas outlet of the short pipe is positioned at one fifth of the height of the reaction chamber 3. The first branch pipe and the second branch pipe are respectively connected with the first flow regulating valve 6 and the second flow regulating valve 6, and by adopting the structure, the flow velocity of ozone in the first branch pipe and the second branch pipe can be independently regulated according to the sulfur and nitrogen content concentration collected on the controller, so that the utilization rate of the ozone is improved. The gas detection sensor is used for detecting the concentration of nitrogen oxides in smoke. The amount of ozone in the reaction chamber 3 is determined according to the NO content in the original flue gas.
In the embodiment, the cooling pipe 4 comprises a straight pipe section and a coil pipe section, the coil pipe section is positioned at the flue gas inlet end, by adopting the structural design, the contact area between the flue gas at the flue gas inlet 301 and a cooling medium is increased, the flue gas temperature at the side of the flue gas inlet 301 can be quickly reduced, and the volume of the reaction chamber 3 cannot be reduced because only one section of the cooling pipe 4 adopts the coil pipe section, so that the cooling pipe 4 is beneficial to increasing the treatment capacity of the reaction chamber 3 on the flue gas under the condition that the volumes of the reaction chambers 3 are equal, thereby reducing the treatment cost. In this embodiment, the ratio of the height of the coil section to the height of the straight tube section is 1:2, the inner diameter of the cooling tube 4 is 1/4, the inner diameter of the reaction chamber 3 is cylindrical in this embodiment.
The surface coating of the flow baffle 7 in this embodiment has one deck acid corrosion resistant coating, thereby the acid corrosion resistance of the flow baffle 7 has been improved, be connected through fixed slot and splint between 3 inner walls of flow baffle 7 and the reacting chamber, be provided with half circle ring shape fixed slot on the 3 inner walls of reacting chamber, the vertical section that the flow baffle 7 is personally submitted the V font, arcwall face and inclined plane including vertical setting, during the installation, the arcwall face inserts in the fixed slot, its bottom stretches out outside the fixed slot and fixes the below at the fixed slot through splint, adopt this structure setting, the dark commentaries on classics of flow baffle 7 is dismantled efficiently, and fixed stable, can not be inclined to one side by the flue gas area that rises.
An integrated flue gas desulfurization and denitrification process comprises the following steps:
(1) firstly, enabling flue gas to pass through a hydrogen peroxide spray tower, then enabling the flue gas to enter a reaction chamber 3 from a flue gas inlet 301, detecting the temperature of the flue gas by a temperature sensor in the flue gas inlet 301, transmitting the temperature value to a controller, adjusting the opening and closing and the flow of cooling media in a cooling chamber 2 and a cooling pipe 4 according to the detected temperature of the flue gas, and controlling the temperature to be lower than 180 ℃; the cooling medium in the cooling chamber 2 and the cooling pipe 4 adopts water or water vapor, and the flow direction of the cooling medium is opposite to that of the flue gas;
(2) opening an ozone inlet valve, opening an inlet valve on a branch pipe with a short length, and then opening an inlet valve on a branch pipe with a long length, wherein the molar ratio of ozone to nitric oxide is 0.9;
(3) the flue gas outlet 302 is connected with a gas component at the flue gas outlet 302 end of the gas detection sensor, and transmits detection data to the controller, and the controller adjusts the opening and closing of the outlet valve according to the detection result;
(4) and discharging the treated flue gas into an absorption tower, further absorbing by adopting alkali liquor and hydrogen peroxide respectively, and discharging the flue gas after meeting the discharge standard.
Example 2
In this embodiment, the ratio of the height of the coil section to the height of the straight tube section is 1:3, the inner diameter of the cooling tube 4 is 1/4, and the angle between the baffle plate 7 and the inner wall of the reaction chamber 3 is 30 ℃.
An integrated flue gas desulfurization and denitrification process comprises the following steps:
(1) firstly, enabling flue gas to pass through a hydrogen peroxide spray tower, then enabling the flue gas to enter a reaction chamber 3 from a flue gas inlet 301, detecting the temperature of the flue gas by a temperature sensor in the flue gas inlet 301, transmitting the temperature value to a controller, adjusting the opening and closing and the flow of cooling media in a cooling chamber 2 and a cooling pipe 4 according to the detected temperature of the flue gas, and controlling the temperature to be lower than 180 ℃; the cooling medium in the cooling chamber 2 and the cooling pipe 4 adopts water or water vapor, and the flow direction of the cooling medium is opposite to that of the flue gas;
(2) opening an ozone inlet valve, opening an inlet valve on a branch pipe with a short length, and then opening an inlet valve on a branch pipe with a long length, wherein the molar ratio of ozone to nitric oxide is 0.92;
(3) the flue gas outlet 302 is connected with a gas component at the flue gas outlet 302 end of the gas detection sensor, and transmits detection data to the controller, and the controller adjusts the opening and closing of the outlet valve according to the detection result;
(4) and discharging the treated flue gas into an absorption tower, further absorbing by adopting alkali liquor and hydrogen peroxide respectively, and discharging the flue gas after meeting the discharge standard.
Example 3
In this embodiment, the ratio of the height of the coil section to the height of the straight tube section is 1:2, the inner diameter of the cooling tube 4 is 1/3, and the angle between the baffle plate 7 and the inner wall of the reaction chamber 3 is 35 ℃.
An integrated flue gas desulfurization and denitrification process comprises the following steps:
(1) firstly, enabling flue gas to pass through a hydrogen peroxide spray tower, then enabling the flue gas to enter a reaction chamber 3 from a flue gas inlet 301, detecting the temperature of the flue gas by a temperature sensor in the flue gas inlet 301, transmitting the temperature value to a controller, adjusting the opening and closing and the flow of cooling media in a cooling chamber 2 and a cooling pipe 4 according to the detected temperature of the flue gas, and controlling the temperature to be lower than 180 ℃; the cooling medium in the cooling chamber 2 and the cooling pipe 4 adopts water or water vapor, and the flow direction of the cooling medium is opposite to that of the flue gas;
(2) opening an ozone inlet valve, opening an inlet valve on a branch pipe with a short length, and then opening an inlet valve on a branch pipe with a long length, wherein the molar ratio of ozone to nitric oxide is 0.95;
(3) the flue gas outlet 302 is connected with a gas component at the flue gas outlet 302 end of the gas detection sensor, and transmits detection data to the controller, and the controller adjusts the opening and closing of the outlet valve according to the detection result;
(4) and discharging the treated flue gas into an absorption tower, further absorbing by adopting alkali liquor and hydrogen peroxide respectively, and discharging the flue gas after meeting the discharge standard.
Example 4
In this embodiment, the ratio of the height of the coil section to the height of the straight tube section is 1:1, the inner diameter of the cooling tube 4 is 1/4, and the angle between the baffle 7 and the inner wall of the reaction chamber 3 is 40 °.
An integrated flue gas desulfurization and denitrification process comprises the following steps:
(1) firstly, enabling flue gas to pass through a hydrogen peroxide spray tower, then enabling the flue gas to enter a reaction chamber 3 from a flue gas inlet 301, detecting the temperature of the flue gas by a temperature sensor in the flue gas inlet 301, transmitting the temperature value to a controller, adjusting the opening and closing and the flow of cooling media in a cooling chamber 2 and a cooling pipe 4 according to the detected temperature of the flue gas, and controlling the temperature to be lower than 180 ℃; the cooling medium in the cooling chamber 2 and the cooling pipe 4 adopts water or water vapor, and the flow direction of the cooling medium is opposite to that of the flue gas;
(2) opening an ozone inlet valve, opening an inlet valve on a branch pipe with a short length, and then opening an inlet valve on a branch pipe with a long length, wherein the molar ratio of ozone to nitric oxide is 0.98;
(3) the flue gas outlet 302 is connected with a gas component at the flue gas outlet 302 end of the gas detection sensor, and transmits detection data to the controller, and the controller adjusts the opening and closing of the outlet valve according to the detection result;
(4) and discharging the treated flue gas into an absorption tower, further absorbing by adopting alkali liquor and hydrogen peroxide respectively, and discharging the flue gas after meeting the discharge standard.
Example 5
In this embodiment, the ratio of the height of the coil section to the height of the straight tube section is 1:2, the inner diameter of the cooling tube 4 is 1/4, and the angle between the baffle 7 and the inner wall of the reaction chamber 3 is 45 °.
An integrated flue gas desulfurization and denitrification process comprises the following steps:
(1) firstly, enabling flue gas to pass through a hydrogen peroxide spray tower, then enabling the flue gas to enter a reaction chamber 3 from a flue gas inlet 301, detecting the temperature of the flue gas by a temperature sensor in the flue gas inlet 301, transmitting the temperature value to a controller, adjusting the opening and closing and the flow of cooling media in a cooling chamber 2 and a cooling pipe 4 according to the detected temperature of the flue gas, and controlling the temperature to be lower than 180 ℃; the cooling medium in the cooling chamber 2 and the cooling pipe 4 adopts water or water vapor, and the flow direction of the cooling medium is opposite to that of the flue gas;
(2) opening an ozone inlet valve, opening an inlet valve on a branch pipe with a short length, and then opening an inlet valve on a branch pipe with a long length, wherein the molar ratio of ozone to nitric oxide is 1;
(3) the flue gas outlet 302 is connected with a gas component at the flue gas outlet 302 end of the gas detection sensor, and transmits detection data to the controller, and the controller adjusts the opening and closing of the outlet valve according to the detection result;
(4) and discharging the treated flue gas into an absorption tower, further absorbing by adopting alkali liquor and hydrogen peroxide respectively, and discharging the flue gas after meeting the discharge standard.
The efficiency of the integrated desulfurization and denitrification process of examples 1-5 are shown in tables 1 and 2, respectively, where table 1 is the denitrification efficiency results (since the nitrogen oxides in the flue gas are mainly present in the form of NO, the denitrification efficiency is calculated as NO), and table 2 is the desulfurization efficiency results.
TABLE 1
TABLE 2
As can be seen from the table above, the integrated desulfurization and denitrification efficiency of the flue gas is high, and the cost is low.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The utility model provides a reaction unit of flue gas integration SOx/NOx control which characterized in that: comprises a shell, a reaction chamber is arranged in the shell, a cooling chamber is arranged between the shell and the reaction chamber, the top and the bottom of the cooling chamber are respectively provided with a first cooling medium inlet and a first cooling medium outlet, the bottom of the reaction chamber is provided with a flue gas inlet, the top of the reaction chamber is provided with a flue gas outlet, the inner wall of the reaction chamber is provided with a plurality of flow baffles, a cooling pipe is arranged in the reaction chamber, a second cooling medium inlet and a second cooling medium outlet are respectively arranged at the two ends of the cooling pipe, the bottom of the reaction chamber is also connected with an ozone inlet structure, the air inlet of the reaction chamber is provided with a temperature sensor, the temperature sensor is contacted with the flue gas, the temperature sensor is connected with the controller, the controller is connected with the flue gas inlet valve and the flue gas outlet valve, and the smoke outlet is connected with a sulfur and nitrogen detection sensor, and the sulfur and nitrogen detection sensor is connected with the controller.
2. The integrated desulfurization and denitrification reaction device for flue gas as claimed in claim 1, wherein: the ozone gas inlet structure comprises a main pipe and branch pipes, wherein the branch pipes comprise a first branch pipe and a second branch pipe which are different in length, the gas outlet of the long pipe is positioned at one half of the height of the reaction chamber, and the gas outlet of the short pipe is positioned at one fifth of the height of the reaction chamber.
3. The integrated desulfurization and denitrification reaction device for flue gas as claimed in claim 1, wherein: and the first branch pipe and the second branch pipe are respectively connected with a first flow regulating valve and a second flow regulating valve.
4. The integrated desulfurization and denitrification reaction device for flue gas as claimed in claim 1, wherein: the cooling pipe comprises a straight pipe section and a coil pipe section, and the coil pipe section is positioned at the flue gas inlet end.
5. The integrated desulfurization and denitrification reaction device for flue gas as claimed in claim 1, wherein: the flow baffle plates are in a semicircular ring shape, the flow baffle plates are divided into two rows and arranged on the inner wall of the reaction chamber, and the two rows of flow baffle plates are alternately arranged.
6. The integrated desulfurization and denitrification reaction device for flue gas as claimed in claim 1, wherein: the end of the flow baffle, which is far away from the inner wall of the reaction chamber, faces the flue gas inlet, and the included angle between the flow baffle and the inner wall of the reaction chamber is 30-45 degrees.
7. The integrated desulfurization and denitrification reaction device for flue gas as claimed in claim 1, wherein: the surface coating that keeps off the class board has one deck acid-resistant corrosion coating, keep off and be connected through fixed slot and splint between class board and the reacting chamber inner wall, be provided with semicircle annular fixed slot on the reacting chamber inner wall, keep off the longitudinal section of class board and personally submit the V font, including the arcwall face and the inclined plane of vertical setting, during the installation, the arcwall face inserts in the fixed slot, and outside its bottom stretched out the fixed slot and fixed the below at the fixed slot through splint.
8. A flue gas integrated desulfurization and denitrification process is characterized in that: the process comprises the following steps:
(1) firstly, enabling flue gas to pass through a hydrogen peroxide spray tower, then enabling the flue gas to enter a reaction chamber through a flue gas inlet, detecting the temperature of the flue gas by a temperature sensor in the flue gas inlet, transmitting the temperature value to a controller, adjusting the opening and closing of a cooling chamber and cooling media in a cooling pipe and controlling the flow rate of the cooling media to be lower than 180 ℃ according to the detected temperature of the flue gas;
(2) opening an ozone inlet valve, opening an inlet valve on a branch pipe with a short length, and then opening an inlet valve on a branch pipe with a longer length;
(3) the smoke outlet is connected with the gas component at the smoke outlet end of the gas detection sensor, the detection data is transmitted to the controller, and the controller adjusts the opening and closing of the outlet valve according to the detection result;
(4) and discharging the treated flue gas into an absorption tower, further absorbing by adopting alkali liquor and hydrogen peroxide respectively, and discharging the flue gas after meeting the discharge standard.
9. The integrated desulfurization and denitrification process for flue gas according to claim 8, characterized in that: the molar ratio of the ozone to the nitric oxide is 0.9-1.
10. The integrated desulfurization and denitrification process for flue gas according to claim 8, characterized in that: the cooling medium in the cooling chamber and the cooling pipe adopts water or water vapor, and the flow direction of the cooling medium is opposite to that of the flue gas.
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