CN116441048B - Flue gas denitration and desulfurization treatment process based on front-mounted fan - Google Patents
Flue gas denitration and desulfurization treatment process based on front-mounted fan Download PDFInfo
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- CN116441048B CN116441048B CN202310665410.7A CN202310665410A CN116441048B CN 116441048 B CN116441048 B CN 116441048B CN 202310665410 A CN202310665410 A CN 202310665410A CN 116441048 B CN116441048 B CN 116441048B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000003546 flue gas Substances 0.000 title claims abstract description 76
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 46
- 230000023556 desulfurization Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000012717 electrostatic precipitator Substances 0.000 claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 14
- 230000003009 desulfurizing effect Effects 0.000 claims description 52
- 239000000428 dust Substances 0.000 claims description 22
- 239000007921 spray Substances 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 12
- 238000007790 scraping Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 238000009423 ventilation Methods 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 3
- 239000003830 anthracite Substances 0.000 claims description 3
- 239000000571 coke Substances 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 2
- 239000000779 smoke Substances 0.000 abstract description 4
- 239000003245 coal Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 9
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910001710 laterite Inorganic materials 0.000 description 2
- 239000011504 laterite Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 2
- 229910052815 sulfur oxide Inorganic materials 0.000 description 2
- 244000061176 Nicotiana tabacum Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (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 discloses a flue gas denitration and desulfurization treatment process based on a front-mounted fan, and relates to the technical field of flue gas treatment. The flue gas denitration and desulfurization treatment device comprises a desulfurization tower, a main fan and an electrostatic precipitator desulfurization tower, wherein an air inlet pipe is arranged at the position, close to the bottom end, of the outer surface of one side of the desulfurization tower, one end, far away from the desulfurization tower, of the air inlet pipe is connected with a U-shaped pipe, and the two ends of the U-shaped pipe are respectively provided with the main fan; the invention uses the smoke generated in the electric furnace according to NO x The content is split, so that the treatment time can be saved, the treatment efficiency is improved, meanwhile, the booster fan with the power of 1120KW is arranged in front of the drying kiln, so that the air pulling is more balanced, compared with the rear of the booster fan, the power of the front-arranged fan only needs to reach 50% -60%, the power consumption is reduced, the temperature in the rotary kiln can be better transferred to the rear section, the heat energy utilization rate is improved, the temperature of the calcine produced is guaranteed, the coal consumption is reduced, and the coal consumption of each ton of dry ore calcine is reduced by 10%.
Description
Technical Field
The invention relates to the technical field of flue gas treatment, in particular to a flue gas denitration and desulfurization treatment process based on a front-mounted fan.
Background
The smelting of laterite in China has been advanced from the 6-year starting stage of rapid rising, scale expansion and technology lag to the development stage, the RKEF technology is gradually known and continuously popularized in China after the technology has gone through the old road several decades ago abroad, and the technology is advancing and the levels of management personnel and operation personnel are improving. The new RKEF laterite ore smelting enterprises are put into production in succession in the last two years, play roles of demonstration and standard pole on the aspects of guiding ideas, designs and operation, and promote the development of the nickel-iron industry in China.
The RKEY technology can generate a large amount of flue gas, and the flue gas contains a large amount of polluted gas, so that the flue gas cannot be directly discharged into the air, and the flue gas desulfurization and denitrification technology is a boiler flue gas purification technology applied to the chemical industry for generating multiple nitrogen oxides and sulfur oxides, wherein the nitrogen oxides and the sulfur oxides are one of main sources of air pollution, so that the environmental air purification benefit is quite high by applying the technology;
when the flue gas is subjected to denitration and desulfurization treatment, a fan is arranged on one side close to a desulfurization tower to pressurize the flue gas, the arrangement is called a rear fan, and the rear fan is long in the front flue gas path, high in resistance and easy to cause incapability of normal induced air and incapability of full-load production of a rotary kiln, so that the flue gas of an electric furnace cannot be completely pumped away, the temperature of a furnace cover rises, the rear high-power fan is easy to cause excessive front-stage electrostatic dust removal negative pressure, an electrostatic dust removal polar plate is damaged, and the power consumption is increased.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, a fan is arranged on one side close to a desulfurizing tower to pressurize flue gas, the arrangement is called a rear fan, and only the rear fan is long in front flue gas path and high in resistance, so that the flue gas of an electric furnace cannot be completely pumped away, the temperature of a furnace cover rises, the rear high-power fan is easy to cause excessive negative pressure of front-stage electrostatic dust removal, damage an electrostatic dust removal polar plate and increase power consumption, and the flue gas denitration and desulfurization treatment process based on the front fan is provided.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the flue gas denitration and desulfurization treatment process based on the front-mounted fan comprises the following steps of:
firstly, adding dry ore, anthracite and coke into a rotary kiln together to bake and form calcine, then pouring the calcine into an electric furnace to perform arc smelting reduction, and leading flue gas produced in the rotary kiln into a hot blast furnace of a flue gas denitration and desulfurization treatment system;
step two, the flue gas generated in the electric furnace enters the first air duct, and the gas detection sensor detects NO in the flue gas x Content is detected, wherein NO x Flue gas with the content more than or equal to a preset value m enters the hot blast stove through the second air guide pipe, and NO x The flue gas with the content less than the preset value m enters the air duct III under the action of the booster fan
Step three, the flue gas subjected to heat exchange and temperature reduction of the hot blast stove enters the cyclone dust collector to remove dust, then enters the SCR reactor through the air outlet pipe of the cyclone dust collector to perform denitration, and NO in the denitrated flue gas x The content is less than or equal to 20mg/Nm 3 Mixing the denitrated flue gas with the flue gas in the air duct III, enabling the flue gas to enter the drying kiln after being acted by the booster fan, and mixing NO in the flue gas x The content is less than or equal to 40mg/Nm 3 ；
Step four, the mixed flue gas dried by the drying kiln enters the electrostatic precipitator to remove dust, then enters the desulfurizing tower to desulfurize under the action of the main fan, and the flue gas treated by the desulfurizing tower is discharged into the air;
the outer surface of the upper end of the desulfurizing tower is provided with an air outlet pipe, the position of the outer surface of one side of the desulfurizing tower, which is close to the bottom end, is fixedly communicated with a liquid outlet pipe, the inside of the desulfurizing tower is provided with a spray pipe, the outer surface of the spray pipe is provided with a plurality of groups of spray heads, one end of the spray pipe penetrates through the desulfurizing tower to be connected with an external liquid supply system, a slow flow plate and a filter plate are respectively arranged at the positions of the upper side and the lower side of the spray pipe in the desulfurizing tower, and an air inlet pipe is arranged below the filter plate.
The utility model discloses a desulfurization tower, including desulfurizing tower, filter, movable groove, rubber strip, filter swing joint is in the inside one end of desulfurizing tower, the both sides surface of desulfurizing tower and the equal fixedly connected with extension board in position that the filter corresponds, and the movable groove has been seted up to the position that desulfurizing tower internal surface corresponds with the extension board, the movable groove runs through to the inside of extension board, and the movable groove internal surface is close to the inside one end of desulfurizing tower, filter swing joint is between two sets of movable grooves.
The outer surface of one side of the desulfurizing tower is provided with a motor, the output end of the motor penetrates into the desulfurizing tower and is fixedly connected with a rotating rod, the output end of the motor is rotationally connected with the desulfurizing tower, the rotating rod is positioned below the filter plate, a cleaning brush is arranged at a position, corresponding to the filter plate, of the outer surface of the rotating rod, and the outer surface of the cleaning brush is attached to the outer surface of the filter plate;
racks are fixedly connected to the outer surface of the lower end of the filter plate close to the front end and the rear end, gears are fixedly connected to the outer surface of the rotating rod at positions corresponding to the racks, the gears are in one-to-one correspondence and meshed with the racks, supporting blocks are fixedly connected to the two sides of the inner surface of the desulfurizing tower at positions below the filter plate, and the inside swing joint of supporting shoe has movable post, the upper end surface fixedly connected with connecting plate of movable post, and the upper end surface fixedly connected with scraper blade of connecting plate, movable post surface is provided with the spring, and the one end and the connecting plate fixed connection of spring, the other end and supporting shoe fixed connection, scraper blade surface filter surface laminating mutually.
Flue gas denitration desulfurization processing system based on leading fan, including desulfurizing tower, main fan and electrostatic precipitator one side surface of desulfurizing tower is close to the position of bottom and is provided with the intake pipe, and the one end that the desulfurizing tower was kept away from to the intake pipe is connected with U type pipe, the both ends of U type pipe are provided with main fan respectively, and main fan keeps away from one side of U type pipe and electrostatic precipitator and be linked together, its characterized in that, the one end that main fan was kept away from to electrostatic precipitator is connected with the dry kiln, and the one end that electrostatic precipitator was kept away from to the dry kiln is provided with booster fan, booster fan's power is 1120KW.
Further, one side of the booster fan away from the drying kiln is provided with an SCR reactor and an air duct III, the air duct III is connected with the SCR reactor, one side of the SCR reactor away from the booster fan is communicated with a cyclone dust collector, one side of the cyclone dust collector away from the SCR reactor is communicated with a hot blast stove, two sides of the hot blast stove are respectively connected with an air duct II and a rotary kiln, one end of the air duct II away from the hot blast stove is connected with an air duct I, the air duct I is communicated with the air duct three in a three-phase manner, one end of the air duct I away from the air duct II and the air duct III is connected with an external electric stove, and a gas detection sensor is arranged in the air duct I.
Further, air pressure detection sensors are arranged at the positions, located on the upper side and the lower side of the filter plate, of the two sides of the inner surface of the desulfurizing tower, a control panel is arranged on the outer side of the desulfurizing tower, and the control panel comprises a data acquisition module, a data processing module and a control module;
the data acquisition module is used for acquiring air pressure data above the filter plate and air pressure data below the filter plate and transmitting the air pressure data above the filter plate and the air pressure data below the filter plate to the data processing module;
the data processing module is used for receiving the air pressure data above the filter plate and the air pressure data below the filter plate, comparing the air pressure data above the filter plate with the air pressure data below the filter plate, generating corresponding signals according to the comparison result, and sending the generated signals to the control module;
the control module is used for receiving the signals sent by the data processing module and carrying out feedback execution according to different signals.
Further, the comparison processing operation includes the steps of:
the method comprises the steps of firstly, receiving air pressure data above a filter plate and air pressure data below the filter plate, wherein the air pressure data above the filter plate and the air pressure data below the filter plate respectively comprise two groups of air pressure data, calibrating the two groups of air pressure data of the filter plate into Qn1 and Qn3 respectively, and calibrating the air pressure data below the two groups of filter plates into Qn2 and Qn4 respectively, wherein detection areas of Qn1 and Qn2 are positioned in the same direction, detection areas of Qn3 and Qn4 are positioned in the same direction, qn1 is less than or equal to Qn2, and Qn3 is less than or equal to Qn4;
step two, calculating air pressure data difference values a and b of the two groups of filter plates in the same direction, wherein a=qn2-qn1, b=qn4-qn3, setting an air pressure difference reference value as Z, and when a is less than or equal to Z and b is less than or equal to Z, not performing any treatment;
when a is more than or equal to Z and b is less than or equal to Z, a clockwise rotation signal is generated and sent to the control module, after the control module receives the clockwise rotation signal, the output end of the control motor drives the rotating rod to rotate for two circles clockwise, then the gear rotates for two circles anticlockwise along with the rotating rod and drives the rack to drive the filter plate to move leftwards, the cleaning brush cleans the filter plate in the rotating process of the rotating rod, and the filter plate is scraped by the scraping plate when passing through the scraping plate;
when b is more than or equal to Z and a is less than or equal to Z, generating a counterclockwise rotation signal, sending the counterclockwise rotation signal to a control module, controlling the output end of a motor to drive a rotating rod to rotate counterclockwise for two circles after receiving the counterclockwise rotation signal, and then rotating clockwise for two circles again, and scraping the filter plate by a scraper;
when b is more than or equal to Z and a is more than or equal to Z, a positive and negative rotation signal is generated and sent to the control module, after the control module receives the positive and negative rotation signal, the output end of the control motor drives the rotating rod to rotate for two circles clockwise and four circles anticlockwise, and then rotate for two circles clockwise again, one end with serious filter plate blockage is driven to the inside of the movable groove, one end with good ventilation effect positioned in the movable groove is pulled out, and the filter plate is scraped by the scraping plate in the process.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. in the invention, the smoke generated in the electric furnace is changed according to NO x The content is split, so that the treatment time can be saved, the treatment efficiency is improved, meanwhile, the booster fan with the power of 1120KW is arranged in front of the drying kiln, so that the induced draft is more balanced, compared with the rear of the booster fan, the power of the front-arranged fan only needs to reach 50% -60%, the power consumption is reduced, the temperature in the rotary kiln can be better transferred to the rear section, the heat energy utilization rate is improved, the calcine production temperature is ensured, the coal consumption is reduced, and the calcine consumption of each ton of dry ore is reduced by 10%;
2. in the invention, the air pressure on the upper side and the lower side of the filter plate is detected in real time by the air pressure detection sensor, so that the judgment can be made that: whether the lower extreme surface of filter is because gathering many dirt causes the filtration hole to block up and leads to the unable upward discharge in time of flue gas to cause filter below atmospheric pressure too big, and through carrying out the comparison processing operation to the atmospheric pressure data difference in two groups of filter different regions with the atmospheric pressure difference reference value, combine intelligent clearance, the regulation mode of shake, improve the ventilation effect and the cleanliness of filter, improve the efficiency and the flue gas desulfurization effect of technology later stage desulfurization treatment.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the desulfurizing tower of the present invention;
FIG. 3 is an enlarged view of area A of FIG. 2 in accordance with the present invention;
FIG. 4 is a view of the combination of a filter plate and an extension plate of the present invention;
FIG. 5 is an enlarged view of region B of FIG. 4 in accordance with the present invention;
fig. 6 is an internal schematic diagram of the control panel of the present invention.
Reference numerals: 1. a desulfurizing tower; 101. an air inlet pipe; 102. a U-shaped tube; 103. an air outlet pipe; 104. a liquid outlet pipe; 105. a shower pipe; 106. a spray head; 107. a slow flow plate; 108. a filter plate; 109. an extension plate; 110. a movable groove; 111. a rubber strip; 112. a motor; 113. a rotating lever; 114. cleaning brushes; 115. a rack; 116. a support block; 117. a movable column; 118. a spring; 119. a connecting plate; 120. a scraper; 121. an air pressure detecting sensor; 122. a gear; 2. a main fan; 3. an electrostatic precipitator; 4. a drying kiln; 5. a booster fan; 6. an SCR reactor; 7. a cyclone dust collector; 8. hot blast stove; 9. an air duct II; 10. an air duct I; 11. an air duct III; 12. a gas detection sensor.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
As shown in fig. 1, the flue gas denitration and desulfurization treatment system based on the front-mounted blower provided by the invention comprises a desulfurization tower 1, a main blower 2 and an electrostatic precipitator 3, wherein an air inlet pipe 101 is arranged at the position, close to the bottom end, of the outer surface of one side of the desulfurization tower 1 of the electrostatic precipitator 3, one end, far away from the desulfurization tower 1, of the air inlet pipe 101 is connected with a U-shaped pipe 102, two ends of the U-shaped pipe 102 are respectively provided with the main blower 2, one side, far away from the U-shaped pipe 102, of the main blower 2 is communicated with the electrostatic precipitator 3.
Pressure-increasing airOne side of the machine 5 far away from the drying kiln 4 is provided with an SCR reactor 6 and an air duct three 11, the air duct three 11 is connected with the SCR reactor 6, one side of the SCR reactor 6 far away from the booster fan 5 is communicated with a cyclone dust collector 7, one side of the cyclone dust collector 7 far away from the SCR reactor 6 is communicated with a hot blast stove 8, two sides of the hot blast stove 8 are respectively connected with an air duct two 9 and a rotary kiln, one end of the air duct two 9 far away from the hot blast stove 8 is connected with an air duct one 10, the air duct one 10 is communicated with the air duct three 11, one end of the air duct one 10 far away from the air duct two 9 and the air duct three 11 is connected with an external electric furnace, a gas detection sensor 12 is arranged in the air duct one 10, and the gas detection sensor 12 is used for detecting NO in the passing smoke x And detecting the content of the product.
Examples
As shown in fig. 2 and 3, the difference between this embodiment and embodiment 1 is that the outer surface of the upper end of the desulfurizing tower 1 is provided with an air outlet pipe 103, and the position of the outer surface of one side of the desulfurizing tower 1 near the bottom end is fixedly communicated with a liquid outlet pipe 104, the inside of the desulfurizing tower 1 is provided with a spray pipe 105, and the outer surface of the spray pipe 105 is provided with a plurality of groups of spray nozzles 106, one end of the spray pipe 105 penetrates through the desulfurizing tower 1 and is connected with an external liquid supply system, the desulfurizing liquid is sprayed to the lower side of the desulfurizing tower through the spray nozzles 106 and fully contacts with the flue gas, so that the flue gas can be effectively dehumidified, the position of the inside of the desulfurizing tower 1, which is positioned on the upper side and the lower side of the spray pipe 105, is respectively provided with a slow flow plate 107 and a filter plate 108, and the air inlet pipe 101 is positioned below the filter plate 108.
The both sides surface of desulfurizing tower 1 and the position that filter 108 corresponds all fixedly connected with extension board 109, and the activity groove 110 has been seted up to the position that desulfurizing tower 1 internal surface corresponds with extension board 109, and activity groove 110 runs through to the inside of extension board 109, and the one end that the activity groove 110 internal surface is close to inside desulfurizing tower 1 is provided with rubber strip 111, filter 108 swing joint is between two sets of activity grooves 110.
Examples
As shown in fig. 2-5, the difference between this embodiment and embodiments 1 and 2 is that a motor 112 is disposed on the outer surface of one side of the desulfurizing tower 1, and the output end of the motor 112 penetrates into the desulfurizing tower 1 and is fixedly connected with a rotating rod 113, the output end of the motor 112 is rotationally connected with the desulfurizing tower 1, and the rotating rod 113 is rotationally connected with the desulfurizing tower 1, the rotating rod 113 is located below the filter plate 108, a cleaning brush 114 is disposed on the outer surface of the rotating rod 113 corresponding to the filter plate 108, and the outer surface of the cleaning brush 114 is attached to the outer surface of the filter plate 108;
the lower end outer surface of the filter plate 108 is fixedly connected with racks 115 at positions close to the front end and the rear end, gears 122 are fixedly connected to positions, corresponding to the racks 115, of the outer surface of the rotating rod 113, the gears 122 are in one-to-one correspondence with the racks 115 and meshed with each other, supporting blocks 116 are fixedly connected to positions, located below the filter plate 108, of two sides of the inner surface of the desulfurizing tower 1, movable posts 117 are movably connected to the inside of the supporting blocks 116, connecting plates 119 are fixedly connected to the outer surfaces of the upper ends of the movable posts 117, scraping plates 120 are fixedly connected to the outer surfaces of the upper ends of the connecting plates 119, springs 118 are arranged on the outer surfaces of the movable posts 117, one ends of the springs 118 are fixedly connected with the connecting plates 119, the other ends of the springs 118 are fixedly connected with the supporting blocks 116, and the outer surfaces of the scraping plates 120 are attached to the outer surfaces of the filter plates 108;
the output end of the control motor 112 drives the rotating rod 113 to rotate positively and negatively, the gear 122 rotates along with the rotating rod 113 and drives the rack 115 to drive the filter plate 108 to move leftwards, the cleaning brush 114 cleans the filter plate 108 in the rotating process of the rotating rod 113, meanwhile, the filter plate 108 with poor ventilation effect of the filter hole enters the corresponding movable groove 110 and is scraped through the scraper 120 when passing through the scraper 120, meanwhile, in the process of repeatedly meshing the rack 115 and the gear 122, the spring 118, the rubber strip 111, the rack 115 and the gear 122 are mutually matched, the filter plate 108 repeatedly moves up and down, and the scraper 120 is always attached to the filter plate 108 under the action of the spring 118 in the process.
Examples
As shown in fig. 2-6, the difference between this embodiment and embodiment 1, embodiment 2, and embodiment 3 is that the positions of the two sides of the inner surface of the desulfurizing tower 1, which are located on the upper and lower sides of the filter plate 108, are provided with air pressure detecting sensors 121, and the outer side of the desulfurizing tower 1 is provided with a control panel, which includes a data acquisition module, a data processing module, and a control module;
the data acquisition module is used for acquiring the air pressure data above the filter plate 108 and the air pressure data below the filter plate 108, and transmitting the air pressure data above the filter plate 108 and the air pressure data below the filter plate 108 to the data processing module;
the data processing module is used for receiving the air pressure data above the filter plate 108 and the air pressure data below the filter plate 108, comparing the air pressure data above the filter plate 108 with the air pressure data below the filter plate 108, generating corresponding signals according to the comparison result, and sending the generated signals to the control module;
the control module is used for receiving the signals sent by the data processing module and carrying out feedback execution according to different signals.
The comparison processing operation comprises the following steps:
step one, receiving air pressure data above the filter plate 108 and air pressure data below the filter plate 108, wherein the air pressure data above the filter plate 108 and the air pressure data below the filter plate 108 respectively comprise two groups of concentration data, the air pressure data of the two groups of filter plates 108 are respectively calibrated to be Qn1 and Qn3, the air pressure data below the two groups of filter plates 108 are respectively calibrated to be Qn2 and Qn4, wherein detection areas of Qn1 and Qn2 are positioned in the same direction, detection areas of Qn3 and Qn4 are positioned in the same direction, and Qn1 is less than or equal to Qn2, and Qn3 is less than or equal to Qn4;
step two, a=qn2-qn1, b=qn4-qn3, setting the air pressure difference reference value as Z, and when a is less than or equal to Z and b is less than or equal to Z, not making any treatment;
when a is more than or equal to Z and b is less than or equal to Z, generating a clockwise rotation signal and sending the clockwise rotation signal to the control module;
when b is more than or equal to Z and a is less than or equal to Z, generating a counterclockwise rotation signal and sending the counterclockwise rotation signal to the control module;
and when b is more than or equal to Z and a is more than or equal to Z, generating a forward and reverse rotation signal and sending the forward and reverse rotation signal to the control module.
After receiving the clockwise rotation signal, the control module controls the output end of the motor 112 to drive the rotating rod 113 to rotate for two circles clockwise, then drives the rack 115 to drive the filter plate 108 to move leftwards by rotating the rotating rod 113 by two circles of gears 122, the filter plate 108 is cleaned by the cleaning brush 114 in the rotating process of the rotating rod 113, meanwhile, the filter plate 108 with poor ventilation effect of the filter hole enters the corresponding movable groove 110, and when the filter plate passes through the scraper 120, the filter plate is scraped by the scraper 120, and meanwhile, in the process of repeatedly meshing the rack 115 and the gear 122, the spring 118 and the rubber strip 111 are mutually matched with the rack 115 and the gear 122, the filter plate 108 moves up and down repeatedly, so that the filter plate 108 is helped to separate from a blocking object in the filter hole, and the scraper 120 is always attached to the filter plate 108 under the action of the spring 118 in the process;
after receiving the counterclockwise rotation signal, the control module controls the output end of the motor 112 to drive the rotating rod 113 to rotate counterclockwise for two circles and then rotate clockwise for two circles;
after receiving the forward and reverse rotation signals, the control module controls the output end of the motor 112 to drive the rotating rod 113 to rotate clockwise for two circles and anticlockwise for four circles, and then rotates clockwise for two circles, one end with serious blocking of the filter plate 108 is driven into the movable groove 110, one end with good ventilation effect in the movable groove 110 is pulled out, the passing area of smoke can be increased rapidly in the cleaning process, and meanwhile, the filter plate 108 can be assisted to shake up and down, so that blocking objects are separated from the filter plate 108 as soon as possible, and the area with poor filtering effect of the filter plate 108 is cleaned and replaced in time;
examples
As shown in fig. 2 and 3, this embodiment is different from embodiment 1, embodiment 2, embodiment 3, and embodiment 4 in that the flue gas denitration and desulfurization treatment process based on the front-end fan includes the following steps:
firstly, adding dry ore, anthracite and coke into a rotary kiln together for roasting to form calcine, then pouring the calcine into an electric furnace for arc smelting reduction, and leading flue gas produced in the rotary kiln into a hot blast furnace 8 of a flue gas denitration and desulfurization treatment system;
step two, the flue gas generated in the electric furnace enters the first gas guide pipe 10, and the first gas guide pipe 10 detects NO in the flue gas by the sensor 12 x Content is detected, wherein NO x The flue gas with the content more than or equal to the preset value m enters the hot blast stove 8 through the second air guide pipe 9, NO x Tobacco with content less than preset value mThe gas enters the air duct III 11 under the action of the booster fan 5, and according to NO in the flue gas x The flue gas is subjected to split treatment according to different contents, so that the treatment time can be saved, and the treatment efficiency can be improved;
step three, the flue gas subjected to heat exchange and temperature reduction by the hot blast stove 8 enters the cyclone dust collector 7 to remove dust, and then enters the SCR reactor 6 through the air outlet pipe 103 of the cyclone dust collector 7 to perform denitration, and NO in the flue gas subjected to denitration x The content is less than or equal to 20mg/Nm3, the flue gas after denitration is mixed with the flue gas in the third air duct 11, then enters the interior of the drying kiln 4 after the action of the booster fan 5, and NO in the mixed flue gas x The content is less than or equal to 40mg/Nm3;
and step four, the mixed flue gas dried by the drying kiln 4 enters the electrostatic precipitator 3 for dedusting, then enters the desulfurizing tower 1 for desulfurization under the action of the main fan 2, and the flue gas treated by the desulfurizing tower 1 is discharged into the air.
The present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the inventive concept thereof, can be replaced or changed within the scope of the present invention.
Claims (5)
1. The flue gas denitration and desulfurization treatment process based on the front-mounted fan is characterized by comprising the following steps of:
firstly, adding dry ore, anthracite and coke into a rotary kiln together to bake and form calcine, then pouring the calcine into an electric furnace to perform arc smelting reduction, and leading flue gas produced in the rotary kiln into a hot blast furnace (8) of a flue gas denitration and desulfurization treatment system;
step two, the flue gas generated in the electric furnace enters the first gas guide pipe (10), and the gas detection sensor (12) detects NO in the flue gas x Detecting the content, and respectively entering the gas guide pipe I (10) and the hot blast stove (8) in the flue gas, wherein NO x Flue gas with the content more than or equal to a preset value m enters the hot blast stove through the second air guide pipe (9)8) NO inside (2) x The flue gas with the content less than the preset value m enters the interior of the air duct III (11) under the action of the booster fan (5);
step three, the flue gas subjected to heat exchange and temperature reduction by the hot blast stove (8) enters the cyclone dust collector (7) to remove dust, and then enters the SCR reactor (6) through the air outlet pipe (103) of the cyclone dust collector (7) to perform denitration, and NO in the flue gas subjected to denitration x The content is less than or equal to 20mg/Nm 3 The flue gas after denitration is mixed with the flue gas in the air duct III (11), then enters the drying kiln (4) after being acted by the booster fan (5), and NO in the mixed flue gas x The content is less than or equal to 40mg/Nm 3 ；
Step four, the mixed flue gas dried by the drying kiln (4) enters the electrostatic precipitator (3) for dust removal, then enters the desulfurizing tower (1) for desulfurization under the action of the main fan (2), and the flue gas treated by the desulfurizing tower (1) is discharged into the air;
the desulfurization tower is characterized in that an air outlet pipe (103) is arranged on the outer surface of the upper end of the desulfurization tower (1), a liquid outlet pipe (104) is fixedly communicated with the outer surface of one side of the desulfurization tower (1) close to the bottom end, a spray pipe (105) is arranged in the desulfurization tower (1), a plurality of groups of spray heads (106) are arranged on the outer surface of the spray pipe (105), one end of the spray pipe (105) penetrates through the desulfurization tower (1) to be connected with an external liquid supply system, slow flow plates (107) and filter plates (108) are respectively arranged in the desulfurization tower (1) at the positions of the upper side and the lower side of the spray pipe (105), and the air inlet pipe (101) is positioned below the filter plates (108);
the two sides of the desulfurizing tower (1) are fixedly connected with extension plates (109) at positions corresponding to the filter plates (108), movable grooves (110) are formed in positions corresponding to the extension plates (109) on the inner surface of the desulfurizing tower (1), the movable grooves (110) penetrate into the extension plates (109), rubber strips (111) are arranged at one end, close to the inside of the desulfurizing tower (1), of the inner surface of each movable groove (110), and the filter plates (108) are movably connected between the two groups of movable grooves (110);
the outer surface of one side of the desulfurizing tower (1) is provided with a motor (112), the output end of the motor (112) penetrates into the desulfurizing tower (1) and is fixedly connected with a rotating rod (113), the output end of the motor (112) is rotationally connected with the desulfurizing tower (1), the rotating rod (113) is positioned below the filter plate (108), a cleaning brush (114) is arranged at a position, corresponding to the filter plate (108), of the outer surface of the rotating rod (113), and the outer surface of the cleaning brush (114) is attached to the outer surface of the filter plate (108);
the utility model discloses a desulfurization tower, including filter, connecting plate, movable column (117), connecting plate (119) are all fixedly connected with in the position that the lower extreme surface of filter (108) is close to front and back both ends, and the position fixedly connected with gear (122) that dwang (113) surface and rack (115) correspond, gear (122) and rack (115) one-to-one and intermeshing, the both sides of desulfurizing tower (1) internal surface are located the position of filter (108) below and all fixedly connected with supporting shoe (116), and the inside swing joint of supporting shoe (116) has movable column (117), the upper end surface fixedly connected with connecting plate (119) of movable column (117), and the upper end surface fixedly connected with scraper blade (120) of connecting plate (119), movable column (117) surface is provided with spring (118), and the one end and connecting plate (119) fixedly connected with of spring (118), the other end and supporting shoe (116) fixedly connected with, the laminating is laminated mutually to filter (108) surface.
2. The flue gas denitration and desulfurization treatment process based on the front-end fan according to claim 1, wherein the flue gas denitration and desulfurization treatment system comprises a desulfurization tower (1), a main fan (2) and an electrostatic precipitator (3), an air inlet pipe (101) is arranged at a position, close to the bottom end, of one side outer surface of the desulfurization tower (1), one end, far away from the desulfurization tower (1), of the air inlet pipe (101) is connected with a U-shaped pipe (102), the two ends of the U-shaped pipe (102) are respectively provided with the main fan (2), one side, far away from the U-shaped pipe (102), of the main fan (2) is communicated with the electrostatic precipitator (3), one end, far away from the main fan (2), of the electrostatic precipitator (3) is connected with a drying kiln (4), one end, far away from the electrostatic precipitator (3), of the drying kiln (4) is provided with a booster fan (5), and the power of the booster fan (5) is 1120KW.
3. The flue gas denitration and desulfurization treatment process based on the front-end fan according to claim 2, wherein one side of the booster fan (5) far away from the drying kiln (4) is provided with an SCR reactor (6) and an air duct III (11), the air duct III (11) is connected with the SCR reactor (6), one side of the SCR reactor (6) far away from the booster fan (5) is communicated with a cyclone dust collector (7), one side of the cyclone dust collector (7) far away from the SCR reactor (6) is communicated with a hot blast stove (8), two sides of the hot blast stove (8) are respectively connected with an air duct II (9) and a rotary kiln, one end of the air duct II (9) far away from the hot blast stove (8) is connected with an air duct I (10), one end of the air duct I (10) far away from the air duct II (9) and the air duct III (11) is connected with an external electric stove, and a gas detection sensor (12) is arranged in the air duct I (10).
4. The flue gas denitration and desulfurization treatment process based on the front-end blower according to claim 2, wherein the positions of the two sides of the inner surface of the desulfurization tower (1) which are positioned on the upper side and the lower side of the filter plate (108) are respectively provided with an air pressure detection sensor (121), the outer side of the desulfurization tower (1) is provided with a control panel, and the control panel comprises a data acquisition module, a data processing module and a control module;
the data acquisition module is used for acquiring air pressure data above the filter plate (108) and air pressure data below the filter plate (108) and transmitting the air pressure data above the filter plate (108) and the air pressure data below the filter plate (108) to the data processing module;
the data processing module is used for receiving the air pressure data above the filter plate (108) and the air pressure data below the filter plate (108), comparing the air pressure data above the filter plate (108) with the air pressure data below the filter plate (108), generating corresponding signals according to the comparison result, and sending the generated signals to the control module;
the control module is used for receiving the signals sent by the data processing module and carrying out feedback execution according to different signals.
5. The pre-fan-based flue gas denitration and desulfurization treatment process according to claim 4, wherein the comparison treatment operation comprises the following steps:
step one, receiving air pressure data above a filter plate (108) and air pressure data below the filter plate (108), wherein the air pressure data above the filter plate (108) and the air pressure data below the filter plate (108) respectively comprise two groups of air pressure data, the air pressure data of the two groups of filter plates (108) are respectively calibrated to be Qn1 and Qn3, the air pressure data below the two groups of filter plates (108) are respectively calibrated to be Qn2 and Qn4, the detection areas of Qn1 and Qn2 are positioned in the same direction, the detection areas of Qn3 and Qn4 are positioned in the same direction, and Qn1 is less than or equal to Qn2, and Qn3 is less than or equal to Qn4;
step two, calculating air pressure data difference values a and b of the two groups of filter plates (108) in the same direction, wherein a=qn2-qn1, b=qn4-qn3, setting an air pressure difference reference value as Z, and when a is less than or equal to Z and b is less than or equal to Z, not performing any treatment;
when a is more than or equal to Z and b is less than or equal to Z, a clockwise rotation signal is generated and sent to the control module, after the control module receives the clockwise rotation signal, the output end of the control motor (112) drives the rotating rod (113) to rotate for two circles clockwise, then the two circles of gears (122) rotate along with the rotating rod (113) and drive the rack (115) to drive the filter plate (108) to move leftwards, the cleaning brush (114) cleans the filter plate (108) in the rotating process of the rotating rod (113), and the filter plate (108) is scraped by the scraping plate (120) when passing through the scraping plate (120);
when b is more than or equal to Z and a is less than or equal to Z, a counterclockwise rotation signal is generated and sent to the control module, after the control module receives the counterclockwise rotation signal, the output end of the control motor (112) drives the rotating rod (113) to rotate two times counterclockwise, then the rotating rod rotates two times clockwise, and the scraping plate (120) scrapes the filter plate;
when b is more than or equal to Z and a is more than or equal to Z, a positive and negative rotation signal is generated and sent to the control module, after the control module receives the positive and negative rotation signal, the output end of the control motor (112) drives the rotating rod (113) to rotate clockwise for two circles and anticlockwise for four circles, and then rotate clockwise for two circles again, one end with serious blocking of the filter plate (108) is driven to the inside of the movable groove (110), one end with good ventilation effect inside the movable groove (110) is pulled out, and the scraper (120) scrapes the filter plate in the process.
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