CN111408262A - Device and method for dedusting and purifying tail gas of glass melting furnace - Google Patents
Device and method for dedusting and purifying tail gas of glass melting furnace Download PDFInfo
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- CN111408262A CN111408262A CN202010353257.0A CN202010353257A CN111408262A CN 111408262 A CN111408262 A CN 111408262A CN 202010353257 A CN202010353257 A CN 202010353257A CN 111408262 A CN111408262 A CN 111408262A
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- flue gas
- negative pressure
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- cooling tower
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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
- B01D53/68—Halogens or halogen compounds
- B01D53/685—Halogens or halogen compounds by treating the gases with solids
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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
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0004—Crystallisation cooling by heat exchange
- B01D9/0009—Crystallisation cooling by heat exchange by direct heat exchange with added cooling fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
-
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
Abstract
The invention relates to a method for dedusting and purifying tail gas of a glass melting furnace, which comprises the steps of introducing flue gas at 450-560 ℃ into a negative pressure main pipe (1) for cooling; after the temperature is reduced, the flue gas with the temperature of 120-400 ℃ enters a spray cooling tower (3), and the temperature of the flue gas at an air outlet (3 d) is reduced to 75-80 ℃; then the flue gas enters a mixer (4) and a mixing pipe (5) to be mixed and reacted with calcium hydroxide from a negative pressure branch pipe (7) to absorb acid pollutants and redundant water in the flue gas, so that the temperature of the flue gas is reduced to below 65 ℃; then the calcium hydroxide enters a bag-type dust remover (6), the calcium hydroxide which is not completely reacted and the acid gas in the flue gas continue to carry out secondary reaction, and finally the calcium hydroxide is filtered by the bag-type dust remover (6) and then is introduced into a chimney (16) through a variable frequency fan (14) for emptying. The invention has the advantages of filtering, reacting and dedusting the tail gas layer by layer, enabling the tail gas to reach the standard and be discharged, improving the deacidification efficiency, recycling materials and reducing the operation cost and the system pressure fluctuation.
Description
Technical Field
The invention relates to the technical field of glass melting furnace tail gas dust removal, in particular to a device and a method for dust removal and purification of glass melting furnace tail gas.
Background
The glass industry is an energy consumption and pollution great household of the building material industry, and a glass kiln can generate a great amount of smoke dust, dust and SO during working and running2The dust generation point mainly occurs in the raw material processing and transporting process and the glass melting furnace smelting process, wherein the glass melting furnace is a main pollution source.
The glass melting furnace flue gas contains SO2The environment-friendly and environment-friendly rainwater purification agent has strong corrosivity, and can be combined with rainwater to form acid rain after being discharged into the atmosphere, so that if the main pollutants are not timely and effectively purified and are directly discharged into the atmosphere, the environment of the earth atmosphere, the earth soil and even the life safety of human beings are greatly threatened.
Disclosure of Invention
The invention aims to solve the problems of tail gas dust removal of the existing glass melting furnace, and provides a device for tail gas dust removal and purification of the glass melting furnace, which filters, reacts and removes dust layer by layer to ensure that the purified tail gas reaches the standard and is discharged, improves the deacidification efficiency, and reduces the operation cost and the system pressure fluctuation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a device for dedusting and purifying tail gas of a glass melting furnace comprises a negative pressure main pipe connected with a flue gas interface, wherein a group of electric air supply valves are arranged on the negative pressure main pipe, the negative pressure main pipe is connected with a top inlet of a spray cooling tower, a group of spray guns connected with industrial water are arranged at the upper part of the spray cooling tower, a recovery port is arranged at the middle part of the spray cooling tower, an air outlet is arranged at the lower part of the spray cooling tower, the air outlet is connected with a mixer through a pipeline, a baffle is arranged in the mixer, an outlet of the mixer is connected with a bag-type dust collector through a mixing pipe, a negative pressure branch pipe is connected to the mixing pipe;
an ash hopper below the bag-type dust collector is connected with a recovery pipe, one end of the recovery pipe is connected with a recovery fan, a manual regulating valve is arranged on the recovery pipe, and the recovery pipe is connected with a recovery port in the middle of the spray cooling tower and used for recovering calcium hydroxide in the dust collector;
the outlet of the bag-type dust collector is connected with a group of frequency conversion fans connected in parallel through a pipeline, each frequency conversion fan is connected with an electric butterfly valve, and the frequency conversion fans are connected with a chimney through pipelines so as to be used for emptying the flue gas after dust removal.
Further, the spray gun is a two-fluid spray gun.
Furthermore, a bin top type bag-type dust collector is arranged at the top of the calcium hydroxide bin and used for treating a large amount of raised dust generated during feeding.
Further, all pipelines are negative pressure pipelines, and all are equipped with the sensor on the pipeline to be used for the pressure, temperature, flow and the dew point condition of monitoring gas.
The device provided by the invention is uniformly operated by an external electric control system, automatically processes the running condition of each device, and feeds back the data monitored by the sensor in time and reacts.
In order to further achieve the aim of the invention, the invention also provides a method for dedusting and purifying the tail gas of the glass melting furnace, the used device comprises a spray cooling tower, a mixer, a calcium hydroxide bin and a bag-type dust remover, and the method comprises the following specific steps:
(1) the temperature of flue gas in the glass kiln is reduced to 450-560 ℃ after being mixed with cold air, the flue gas enters a negative pressure main pipe after being mixed, and meanwhile, an electric air supplement valve is used for controlling the temperature of the flue gas in the negative pressure main pipe;
(2) the treated flue gas with the temperature of 120-400 ℃ enters a spray cooling tower, the top-inlet bottom-outlet direct spraying type is adopted in the spray cooling tower due to the fact that a flue pipe at the top of the spray cooling tower is high, atomized soft water in the tower cools the flue gas, the flue gas has flowing time of at least 15s in the environment with the temperature of less than 80 ℃ in the tower, and the temperature of the flue gas at an air outlet of the spray cooling tower is reduced to 75-80 ℃ so as to facilitate crystallization and granulation of arsenic oxide and boron oxide in tail gas;
(3) cooling, and allowing the flue gas containing water vapor to enter a mixer, wherein a baffle is arranged in the air mixer, and the hydrous calcium hydroxide, boron oxide and arsenic oxide crystals coming out of the spray cooling tower are settled;
(4) then the flue gas enters a mixing pipe to be mixed and reacted with calcium hydroxide from a negative pressure branch pipe, the calcium hydroxide fully absorbs hydrogen chloride and redundant water contained in the flue gas, and the temperature of the flue gas is reduced to be below 65 ℃, so that boron oxide is completely crystallized, and bag pasting of a dust collector is effectively prevented;
(5) the mixed and cooled flue gas enters a bag-type dust collector, is filtered by the bag-type dust collector and then is introduced into a chimney through a variable frequency fan to be discharged into the atmosphere.
Further, in the steps (4) to (5), the calcium hydroxide collected by the ash bucket in the bag-type dust collector is recycled through a recycling pipe and is introduced into the spray cooling tower through a recycling port for recycling.
Compared with the prior art, the invention has the advantages that:
(1) a certain air speed and temperature in the negative pressure main pipe are controlled, so that dust and scale deposition in the pipeline can be effectively avoided, and pipeline blockage caused by precipitation of boron oxide can also be avoided;
(2) the characteristics of arsenic oxide and boron oxide are fully considered, and the temperature of the flue gas of each pipeline is reasonably set according to the characteristics of the arsenic oxide and the boron oxide, so that the arsenic oxide and the boron oxide are recrystallized, and the standard emission of the flue gas is met;
(3) when only one kiln or two kilns are used for production, the water spraying amount can be reduced, the temperature of the flue gas entering the dust remover is reduced to a proper temperature by doping cold air, and the filter bag pasting caused by excessive water spraying can be effectively avoided by additionally arranging the mixer;
(4) calcium hydroxide collected by the dust remover is added into the spray cooling tower, so that the deacidification effect is better, the use amount of the calcium hydroxide is reduced, the operation cost is reduced, the water content of flue gas discharged from the tower is reduced, and bag pasting is avoided;
(5) the whole system has simple and reliable control flow and small system operation pressure fluctuation.
Drawings
FIG. 1 is a process flow diagram of a method for dedusting and purifying tail gas of a glass melting furnace according to the present invention;
fig. 2 is a schematic structural view of a spray cooling tower of the present invention.
Detailed Description
Example 1
In order to make the present invention more clear, the following is a further description of the apparatus and method for dedusting and cleaning tail gas of a glass melting furnace according to the present invention with reference to the attached drawings, and the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.
Referring to fig. 1, a device for glass melting furnace tail gas dust removal purification, includes the negative pressure house steward 1 who links to each other with the flue gas interface, its characterized in that:
referring to fig. 1 and 2, three electric air supply valves 2 are arranged on a negative pressure main pipe 1, the negative pressure main pipe 1 is connected with a top inlet 3a of a spray cooling tower 3, the upper part of the spray cooling tower 3 is provided with a group of spray guns 3b connected with industrial water, the middle part of the spray cooling tower 3 is provided with a recovery port 3c, the lower part of the spray cooling tower is provided with an air outlet 3d, the air outlet 3d is connected with a mixer 4 through a pipeline, a baffle 4a is arranged in the mixer 4, the outlet of the mixer 4 is connected with a bag-type dust remover 6 through a mixing pipe 5, the mixing pipe 5 is connected with a negative pressure branch pipe 7, the negative pressure branch pipe 7 is connected with a calcium hydroxide bin 8, the bottom of the calcium hydroxide bin 8 is provided with a star-shaped discharge valve 10, and the top;
an ash bucket below the bag-type dust collector 8 is connected with a recovery pipe 11, one end of the recovery pipe 11 is connected with a recovery fan 12, a manual regulating valve 13 is arranged on the recovery pipe 11, and the recovery pipe 11 is connected with a recovery port 3c in the middle of the spray cooling tower 3 and used for recovering calcium hydroxide in the dust collector;
the outlet of the bag-type dust collector 8 is connected with a group of frequency conversion fans 14 connected in parallel through a pipeline, each frequency conversion fan 14 is connected with an electric butterfly valve 15, and each frequency conversion fan 14 is connected with a chimney 16 through a pipeline so as to be used for exhausting the dedusted flue gas;
the spray gun 3b is a two-fluid spray gun, all pipelines are negative pressure pipelines, and sensors 17 are arranged on the pipelines and used for monitoring the pressure, temperature, flow and dew point conditions of gas.
The device provided by the invention is uniformly operated by an external electric control system, automatically processes the running condition of each device, and feeds back the data monitored by the sensor in time and reacts.
The method for dedusting and purifying the tail gas of the glass melting furnace by using the device comprises the following specific steps, and is characterized by comprising the following steps:
(1) the temperature of flue gas in the glass kiln is reduced to 450-560 ℃ after being mixed with cold air, the flue gas enters a negative pressure main pipe 1 with the length of 26 meters after being mixed, and meanwhile, an electric air supplement valve 2 is used for controlling the temperature of the flue gas in the negative pressure main pipe 1;
(2) the treated flue gas with the temperature of 120-400 ℃ enters a spray cooling tower 3, the spray cooling tower 3 adopts a top-in bottom-out direct spraying type due to a higher furnace top flue pipe, atomized soft water in the tower cools the flue gas, the design of the spray cooling tower 3 ensures that the flue gas has flowing time of at least 15s in the environment with the temperature of less than 80 ℃ in the tower, and the outlet flue gas temperature is controlled at 75-80 ℃, so that arsenic oxide and boron oxide in tail gas can be conveniently crystallized;
(3) the cooled flue gas containing water vapor enters a mixer 4, a baffle 4a is arranged in the air mixer 4, and the hydrous calcium hydroxide, boron oxide and arsenic oxide crystals coming out of the spray cooling tower 3 are settled;
(4) then the flue gas enters a mixing pipe 5 to be mixed and reacted with calcium hydroxide from a branch pipe 7, a calcium hydroxide bin 8 is arranged on one side of the pipeline and is directly added into a negative pressure branch pipe 7 through a star-shaped discharge valve 10, and the negative pressure branch pipe 7 is connected into the mixing pipe 5 at a high speed side with the wind speed of about 30m/s so as to ensure that the flue gas and the flue gas are completely mixed in the air mixer without other additional power;
(5) the calcium hydroxide fully absorbs the hydrogen chloride and the redundant water contained in the flue gas, and the temperature of the flue gas is reduced to be below 65 ℃, so that the boron oxide is completely crystallized, and the bag pasting of a dust collector is effectively prevented;
(6) the mixed and cooled flue gas enters a bag-type dust collector 6, is filtered by the bag-type dust collector 6 and then is introduced into a chimney 16 with the height of 60 meters through a variable frequency fan 14 to be discharged into the atmosphere;
(7) calcium hydroxide collected by an ash bucket in the bag-type dust collector 6 is recycled through the recycling pipe 11 and is introduced into the spray cooling tower 3 through the recycling port 3c for reuse, so that the deacidification capacity is increased, and the consumption of the calcium hydroxide is reduced.
In order to ensure the adding amount of the calcium hydroxide, the star-shaped discharge valve is controlled by frequency conversion, the calcium hydroxide is added into a bin by a tank truck or is lifted to the bin top by an electric motor at regular time, and is manually added into the bin, a large amount of raised dust is generated during feeding, and a bin top type bag-type dust collector is arranged at the top of the calcium hydroxide bin.
The whole dust removal system comprises a pipeline system, a spray cooling system, a bag-type dust remover, a dust discharging system, an alkali adding system and the like, the control flow is simple and reliable, the fluctuation of system operation pressure is small, dust accumulation and scaling of the pipeline and bag pasting of a filter bag of the dust remover can be avoided, materials can be recycled, the operation cost is reduced, tail gas is filtered, reacted and dedusted layer by layer, the purified tail gas is discharged to the air to reach the standard, and the deacidification efficiency is improved.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. The utility model provides a device for glass melting furnace tail gas dust removal purifies, includes the negative pressure house steward (1) that links to each other with the flue gas interface, its characterized in that:
the negative pressure main pipe (1) is provided with a group of electric air supply valves (2), the negative pressure main pipe (1) is connected with a top inlet (3 a) of a spray cooling tower (3), the upper part of the spray cooling tower (3) is provided with a group of spray guns (3 b), the middle part of the spray cooling tower is provided with a recovery port (3 c), the lower part of the spray cooling tower is provided with an air outlet (3 d), the air outlet (3 d) is connected with a mixer (4) through a pipeline, a baffle (4 a) is arranged in the mixer, an outlet of the mixer (4) is connected with a bag-type dust collector (6) through a mixing pipe (5), the mixing pipe (5) is connected with a negative pressure branch pipe (7), and the negative pressure branch;
the lower part of the bag-type dust collector (6) is connected with a recovery pipe (11), one end of the recovery pipe (11) is connected with a recovery fan (12), a manual regulating valve (13) is arranged on the recovery pipe (11), and the recovery pipe (11) is connected with a recovery port (3 c) in the middle of the spray cooling tower (3);
the outlet of the bag-type dust collector (6) is connected with a group of frequency conversion fans (14) which are connected in parallel through pipelines, and the frequency conversion fans (14) are connected with a chimney (16) through pipelines.
2. The device for dedusting and purifying the tail gas of the glass melting furnace according to claim 1, characterized in that:
all pipelines are negative pressure pipelines, and all pipelines are provided with sensors (17).
3. The device for dedusting and purifying the tail gas of the glass melting furnace according to claim 1 or 2, which is characterized in that:
the top of the calcium hydroxide bin (8) is provided with a bin top type bag-type dust collector (9).
4. The device for dedusting and purifying the tail gas of the glass melting furnace according to claim 1 or 2, which is characterized in that:
the spray gun (3 b) is a two-fluid spray gun.
5. A method for dedusting and purifying tail gas of a glass melting furnace by using the device as claimed in claim 1 or 2, which is characterized by comprising the following steps:
the method comprises the following steps: the temperature of flue gas in the glass kiln is reduced to 450-560 ℃ after being mixed with cold air, the flue gas enters the negative pressure main pipe (1) after being mixed, and meanwhile, the electric air supplement valve (2) is used for controlling the temperature of the flue gas in the negative pressure main pipe (1);
step two: the treated flue gas with the temperature of 120-400 ℃ enters a spray cooling tower (3) to be cooled, and the temperature of the flue gas at an air outlet (3 d) of the spray cooling tower (3) is reduced to 75-80 ℃;
step three: after the temperature is reduced, the flue gas containing water vapor enters a mixer (4), and the hydrous calcium hydroxide, boron oxide and arsenic oxide crystals coming out of the spray cooling tower (3) are settled;
step four: the flue gas enters a mixing pipe (5) to be mixed and reacted with calcium hydroxide from a negative pressure branch pipe (7), so that hydrogen chloride and redundant water in the flue gas are fully absorbed, and the temperature of the flue gas is reduced to below 65 ℃;
step five: the mixed and cooled flue gas enters a bag-type dust collector (6), the incompletely reacted calcium hydroxide is adhered to the windward side of a bag and continuously reacts with acid gas in the flue gas, and the flue gas is filtered by the bag-type dust collector (6) and then is introduced into a chimney (16) through a variable frequency fan (14) to be discharged into the atmosphere.
6. The method for dedusting and purifying the tail gas of the glass melting furnace according to claim 5, characterized in that:
in the fourth step and the fifth step, calcium hydroxide collected by an ash bucket in the bag-type dust collector (6) is introduced into the spray cooling tower (3) through a recovery pipe (11) and a recovery port (3 c) for reuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010353257.0A CN111408262A (en) | 2020-04-29 | 2020-04-29 | Device and method for dedusting and purifying tail gas of glass melting furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010353257.0A CN111408262A (en) | 2020-04-29 | 2020-04-29 | Device and method for dedusting and purifying tail gas of glass melting furnace |
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| CN111408262A true CN111408262A (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010353257.0A Pending CN111408262A (en) | 2020-04-29 | 2020-04-29 | Device and method for dedusting and purifying tail gas of glass melting furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113230831A (en) * | 2021-05-11 | 2021-08-10 | 云南皓普工程技术有限公司 | System and method for washing, arsenic removal and purification of nonferrous smelting flue gas through adiabatic evaporation and cooling |
| CN114014019A (en) * | 2021-11-15 | 2022-02-08 | 聊城市鲁西化工工程设计有限责任公司 | Negative-pressure automatic continuous conveying system and method for powdery or granular materials |
-
2020
- 2020-04-29 CN CN202010353257.0A patent/CN111408262A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113230831A (en) * | 2021-05-11 | 2021-08-10 | 云南皓普工程技术有限公司 | System and method for washing, arsenic removal and purification of nonferrous smelting flue gas through adiabatic evaporation and cooling |
| CN114014019A (en) * | 2021-11-15 | 2022-02-08 | 聊城市鲁西化工工程设计有限责任公司 | Negative-pressure automatic continuous conveying system and method for powdery or granular materials |
| CN114014019B (en) * | 2021-11-15 | 2023-10-03 | 聊城市鲁西化工工程设计有限责任公司 | Automatic negative pressure continuous conveying system and method for powdery or granular materials |
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