CN111974123A - Dust removal device for cooling smoke of smelting furnace by using waste water - Google Patents
Dust removal device for cooling smoke of smelting furnace by using waste water Download PDFInfo
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- CN111974123A CN111974123A CN202010747880.4A CN202010747880A CN111974123A CN 111974123 A CN111974123 A CN 111974123A CN 202010747880 A CN202010747880 A CN 202010747880A CN 111974123 A CN111974123 A CN 111974123A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/02—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath
- B01D47/021—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath by bubbling the gas through a liquid bath
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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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
- B01D53/26—Drying gases or vapours
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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
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- 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
Abstract
The invention discloses a dust removal device for cooling smoke of a smelting furnace by using waste water, which comprises a waste water sedimentation tank, a filter tank, a smoke washing tank, a water mist smoke washing tank and a water-gas separation tank, wherein the waste water sedimentation tank is provided with a first overflow pipe, a waste water inlet pipe, a first sewage discharge pipe and a water pumping pipe, and the water pumping pipe is connected with a water pumping pump, a three-way valve, a spray header and a reflux pump; the filter tank is provided with a filter plate frame and a filter water pipe; the flue gas washing tank is provided with a conical plate, a muddy water pipe, a mud scraping mechanism, a second sewage discharge pipe, a second overflow pipe, a stirring paddle and a flue gas inlet pipe; the water mist smoke washing box is provided with a high-pressure air spray pipe, a third overflow pipe, a third blow-off pipe, a water replenishing pipe and an inclined pipe; the water-gas separation box comprises a snakelike condensation pipe, a V-shaped water tank, a chimney outlet and an unpowered hood. The invention directly applies the waste water after preliminary precipitation to the water film dust removal treatment, integrates dust removal methods such as spray dust removal, water film dust removal, flushing water bath dust removal and the like into a whole, greatly saves the using amount of washing water, simplifies the treatment of waste water and waste gas, and has popularization value.
Description
Technical Field
The invention relates to the technical field of flue gas dust removal, in particular to a dust removal device for cooling flue gas of a smelting furnace by using waste water.
Background
The "three wastes" problem of metal smelting furnaces poses a great threat to the environment, wherein solid waste slag generally adopts relatively fixed treatment means such as landfill, fine metallurgy, building materials and agricultural utilization, and the like, and in contrast, the treatment of waste water and waste gas is much more complicated.
Taking a steel smelting furnace as an example, the waste water comprises cooling water, pickling waste water, washing water, slag flushing waste water and the like, and the waste gas contains sulfur, CO, solid suspended matters and dust and mud particles. Coke powder and the like, and the existing waste gas treatment process needs to use a large amount of water, and the water generates new flue gas washing waste water after washing flue gas, so that the waste water treatment capacity of a smelting plant is seriously tested.
Based on the problems, the invention tries to combine the primary treatment of the waste water and the washing treatment of the flue gas, directly uses the waste water to absorb the dust in the flue gas to generate cleaner flue gas and sludge water, and intensively treats the sludge water so as to reduce the water consumption in the flue gas treatment process.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a dust removal device for cooling smoke of a smelting furnace by using waste water.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dust removal device for cooling smoke of a smelting furnace by using waste water comprises a waste water sedimentation tank, a filtering tank, a smoke washing tank, a water mist smoke washing tank and a water-gas separation tank, wherein a first overflow pipe is arranged at the upper part of the side wall of the waste water sedimentation tank;
a filtering plate frame is erected at the middle upper part of the filtering tank, and a filtering pipe is arranged at the bottom of the side wall of the filtering tank;
the middle part of the flue gas washing tank is provided with a conical plate, the conical plate divides the flue gas washing tank into an upper water film treatment chamber and a lower muddy water precipitation chamber, the conical plate forms a funnel-shaped groove, the central position of the conical plate is communicated with a muddy water pipe, the upper surface of the bottom wall of the muddy water precipitation chamber is provided with a mud scraping mechanism, one side of the bottom wall of the muddy water precipitation chamber is provided with a second blow-off pipe, the bottom outlet of the second blow-off pipe is positioned right above the top opening of the filtering tank, the mud scraping mechanism comprises a belt wrapped by two belt rollers, the belt rollers are erected on two side walls of the flue gas washing tank, one of the belt rollers is connected with a low-speed motor, the outer surface of the belt is equidistantly provided with sieve mesh scrapers, the sieve mesh scrapers on the lower part of the belt are in soft contact with the upper surface of;
the upper part of the side wall of the mud-water precipitation chamber is provided with a second overflow pipe which is communicated with a reflux pump, and after mud-water is separated and precipitated for a period of time, the waste water from which mud is separated can be returned to the water film treatment chamber through a three-way valve, so that water circulation is realized, and water consumption is saved;
the top wall center of the water film processing chamber is connected with a stirring shaft in a penetrating way, the top end of the stirring shaft is connected with a high-speed motor, the bottom end of the stirring shaft is fixedly connected with a stirring paddle, the outer contour of the stirring paddle is a funnel-shaped V-shaped rod which is basically parallel to the surface of the conical plate, the distance between the stirring paddle and the inner surface of the conical plate is 5-10cm, the upper part of the outer surface of the conical plate is provided with a flue gas inlet pipe, the flue gas inlet pipe is horizontally arranged, the air inlet direction is tangent to the cambered surface of the conical plate, the rotating direction of the stirring paddle is controlled to be just opposite to the air inlet direction of the flue gas inlet pipe, namely, the front collision of water is realized, the waste water is driven to rotate at high speed along with the rotation of the stirring paddle above the conical plate, the stirring paddle continuously cuts the water, a high-speed rotating water film is formed on, generating mud and water, and discharging the mud and water into a mud and water settling chamber through a mud and water pipe for mud and water separation;
the top wall of the water film treatment chamber is also connected with a water flushing high-pressure pump through a pipeline, the water flushing high-pressure pump is connected with a high-pressure air spray pipe, one end of the high-pressure air spray pipe is connected on the top wall of the water mist smoke washing box in a penetrating manner, the outlet of the high-pressure air spray pipe is vertically downward, the water mist smoke washing box is divided into a shallow water area and a deep water area by a drooping partition plate, the height of an outer box of the shallow water area is larger than that of an outer box of the deep water area, the high-pressure air spray pipe is arranged on the top wall of the shallow water area, the bottom wall of the shallow water area is provided with a slope block, one side wall of the shallow water area is provided with a third overflow pipe, the distance between the outlet of the bottom end of the high-pressure air spray pipe and the liquid level of the shallow water area is 0.5-1cm, the bottom edge of the drooping partition plate extends below the;
after being pressurized by a flushing high-pressure pump, the medium-humidity flue gas subjected to water film dedusting treatment causes huge impact on the liquid level of a shallow water area and generates sputtering, wherein most dust particles are remained in water after being increased in weight or adhered to the water, and the stage is an impact stage; after this stage, the water surface forms a parabolic water droplet, mist and foam area due to the movement of the gas, and the dust-laden gas is further purified in this area by the water droplet and mist. This is the showering stage; when the dust enters the equipment, the temperature of the flue gas is very high, water mist is formed under the impact of the flue gas in the cylinder, dust particles are further purified by the water mist when changing directions and moving upwards, and the stage is atomizing dust removal; after the three modes are used for purification, an impact type water bath dust removal structure is formed, and dust parts in smoke are further removed;
pipe chute one end intercommunication has snakelike condenser pipe, snakelike condenser pipe one end opening erects the top position at a water gas separator box lateral wall, snakelike condenser pipe other end opening erects on water gas separator box roof, snakelike condenser pipe's bottom is equipped with the waterlogging caused by excessive rainfall hole, be equipped with V-arrangement basin under the waterlogging caused by excessive rainfall hole, V-arrangement basin bottom rigid coupling is on water gas separator box diapire, and outside the lateral wall that stretches out water gas separator box was exported to the one end of V-arrangement basin, the snakelike condenser pipe opening dustcoat that is located water gas separator box roof department is equipped with the chimney exit, the top of chimney exit is equipped with unpowered hood. After the impact type water bath dust removal treatment, the flue gas with ultrahigh humidity is generated and cooled, and the flue gas is relatively clean gas after being condensed and drained by the snake-shaped condenser pipe, can be directly discharged into the air, and is automatically thrown and taken off by utilizing the temperature and air pressure difference, so that most of moisture is further removed.
Preferably, the top of the filter tank is also provided with a pressure pump, the filter plate frame is used for removing sludge in water by adopting a plate-frame filter pressing method of 0.3-0.4MPa, and the sludge on the filter plate frame is cleaned at intervals.
Preferably, the waste water inlet pipe, the first sewage discharge pipe, the water pumping pipe, the first overflow pipe, the water filtering pipe, the muddy water pipe, the second sewage discharge pipe, the second overflow pipe, the flue gas inlet pipe, the high-pressure gas spray pipe, the third overflow pipe, the water replenishing pipe and the inclined pipe are respectively provided with an electromagnetic valve for controlling the opening and closing of each pipeline.
Preferably, the water supplementing pipe is connected with a municipal industrial water supply system, water in the V-shaped water tank returns to the water mist smoke washing tank through the water pump and the water supplementing pipe, partial circulation of condensed water is achieved, and if the condensed water is not enough to maintain the water level in the water mist smoke washing tank, a relatively clean water body needs to be provided from the municipal water system.
Preferably, the third overflow pipe discharges above the filter plate frame through a water pump and a spray pipe for flushing the filter plate frame.
Preferably, the first overflow pipe is communicated above the filter plate frame and used for maintaining the filter plate frame in a long-term wet state.
Preferably, the water discharge of the filtered water pipe has two methods:
firstly, water in a filtering water pipe is discharged into a wastewater sedimentation tank through a water pump and a pipeline, and when wastewater is not supplied timely, water can be temporarily supplied for subsequent water film dust removal and water bath dust removal through the filtering water pipe;
and secondly, water of the water filtering pipes is discharged to a subsequent flocculation tank and an oxidation tank through a water pump and a pipeline for directly carrying out wastewater treatment.
The two methods are based on whether the water in each part of the dust removing device is sufficient or not, the first method is adopted when the water is insufficient, the second method is adopted when the water is excessive, and the specific replacement mode is that the discharge position of the filtered water pipe is manually adjusted.
Preferably, the side walls of the wastewater sedimentation tank, the filtering tank, the flue gas washing tank, the water mist smoke washing tank and the water-gas separation tank are respectively provided with an observation glass strip for observing the water level and sludge deposition condition of each component so as to realize timely water replenishing, water draining and pollution discharge treatment.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention is to directly apply the waste water after primary precipitation to water film dedusting treatment, and aims to take the waste water as the washing water in the first step, thereby saving the consumption of the washing water in the flue gas treatment; in the water film treatment chamber, a high-speed rotating water film is formed on the surface of the conical plate through the high-speed rotation of the stirring paddle, the gas inlet direction of the flue gas is opposite to the rotating direction of the stirring paddle, so that the front collision of the water gas is realized, the smoke dust and solid suspended matters in the flue gas are continuously absorbed, and the front collision type water film dust removal method is realized;
2. the invention also aims at the problem that the smoke temperature is high in the daily smoke discharging process and is not suitable for direct discharging, so that the waste water is in frontal collision contact with the high-temperature smoke to generate steam of the waste water, the smoke can be greatly humidified, the water-flushing type water bath is used for dedusting after humidification, the smoke is further cooled to obtain the smoke with ultrahigh humidity, and the rapid sedimentation of dust in the smoke and the dust-gas separation are promoted, so that clean gas subjected to cooling and dedusting can be obtained;
3. on the other hand, the waste water can fully absorb heavy metal ions and the like in the waste water and promote the sedimentation of the waste water after absorbing dust in the flue gas, so that the waste water is filtered to obtain thicker sludge and clearer treatment liquid, the sludge and the clearer treatment liquid can be respectively treated in a centralized manner, the reduction treatment process of the waste water is realized, and the popularization value is realized.
4. The device of the invention can realize a unique intermittent flue gas dust removal process, which comprises the steps of wastewater precipitation, water pumping and spraying, water film dust removal, mud-water separation, flushing water bath dust removal, water-gas separation and the like, integrates dust removal methods such as spraying dust removal, water film dust removal, flushing water bath dust removal and the like into a whole, greatly saves the consumption of washing water, simplifies the treatment of wastewater and waste gas, and has popularization value.
Drawings
FIG. 1 is a schematic structural view of a dust removing apparatus for cooling a flue gas of a smelting furnace by using waste water according to the present invention;
FIG. 2 is a three-dimensional structure diagram of a flue gas washing tank in the dust removing device for cooling the flue gas of the smelting furnace by using the waste water, which is provided by the invention;
in the figure: the device comprises a wastewater sedimentation tank 1, a first overflow pipe 101, a wastewater inlet pipe 102, a first sewage discharge pipe 103, a water pumping pipe 104, a filter tank 2, a filter plate frame 201, a filter water pipe 202, a flue gas washing tank 3, a conical plate 301, a muddy water pipe 302, a mud scraping mechanism 303, a second sewage discharge pipe 304, a second overflow pipe 305, a stirring shaft 306, a high-speed motor 307, a stirring paddle 308, a flue gas inlet pipe 309, a water mist smoke washing box 4, a high-pressure air jet pipe 401, a drooping partition plate 402, a slope block 403, a third overflow pipe 404, a third sewage discharge pipe 405, a water replenishing pipe 406, an inclined pipe 407, a water-gas separation box 5, a snake-shaped condensation pipe 501, a water draining hole 502, a V-shaped water tank 503, a chimney outlet 504, an unpowered funnel cap 505, a water pumping pump 6, a three-way valve 7, a spray header 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-2, a dust removing device for cooling smoke of a smelting furnace by using waste water comprises a waste water sedimentation tank 1 and a filtering tank 2, the device comprises a flue gas washing tank 3, a water mist washing smoke box 4 and a water-gas separation box 5, wherein a first overflow pipe 101 is arranged at the upper part of the side wall of a wastewater sedimentation tank 1, a wastewater inlet pipe 102 is communicated with the middle part of the side wall of the wastewater sedimentation tank 1, a first drain pipe 103 is arranged on the bottom wall of the wastewater sedimentation tank 1, the outlet at the bottom end of the first drain pipe 103 is positioned right above the top opening of a filter tank 2, a water pumping pipe 104 is arranged at a position near the lower part of the liquid level of the wastewater sedimentation tank 1, the top end of the water pumping pipe 104 extends out of the liquid level and is connected with a water pumping pump 6, the water pumping pump 6 is connected with one end of a three-way valve 7 through a pipeline, the second end of the three-way valve 7 is communicated; a filtering plate frame 201 is erected at the middle upper part of the filtering tank 2, and a filtering water pipe 202 is arranged at the bottom of the side wall of the filtering tank 2; the middle part of the flue gas washing tank 3 is provided with a conical plate 301, the conical plate 301 divides the flue gas washing tank 3 into an upper water film treatment chamber and a lower muddy water precipitation chamber, the conical plate 301 forms a funnel-shaped groove, the central position of the conical plate 301 is communicated with a muddy water pipe 302, the upper surface of the bottom wall of the muddy water precipitation chamber is provided with a mud scraping mechanism 303, one side of the bottom wall of the muddy water precipitation chamber is provided with a second sewage discharge pipe 304, the bottom outlet of the second sewage discharge pipe 304 is positioned right above the top opening of the filtering tank 2, the mud scraping mechanism 303 comprises a belt wrapped by two belt rollers, the belt rollers are erected on two side walls of the flue gas washing tank 3, one of the belt rollers is connected with a low-speed motor, sieve mesh scrapers are arranged on the outer surface of the belt at equal intervals, the sieve mesh scrapers on the lower part of the belt are in soft contact with the, the mud-water separation is completed; the upper part of the side wall of the mud-water precipitation chamber is provided with a second overflow pipe 305, the second overflow pipe 305 is communicated with the reflux pump 9, after mud-water separation and precipitation for a period of time, the waste water from which mud is separated can be returned to the water film treatment chamber through the three-way valve 7, so that water circulation is realized, and water consumption is saved; a stirring shaft 306 is connected in the center of the top wall of the water film treatment chamber in a penetrating way, the top end of the stirring shaft 306 is connected with a high-speed motor 307, the bottom end of the stirring shaft 306 is fixedly connected with a stirring paddle 308, the outer contour of the stirring paddle 308 is a funnel-shaped V-shaped rod which is basically parallel to the surface of the conical plate 301, the distance between the stirring paddle 308 and the inner surface of the conical plate 301 is 5-10cm, a flue gas inlet pipe 309 is arranged at the upper part of the outer surface of the conical plate 301, the flue gas inlet pipe 309 is horizontally arranged, the air inlet direction is tangent to the arc surface of the conical plate 301, the rotation direction of the stirring paddle 308 is controlled to be just opposite to the air inlet direction of the flue gas inlet pipe 309, namely, the front collision of water and air is realized, the stirring paddle 308 rotates above the conical plate 301 to drive the wastewater to rotate at high speed, the, continuously absorbing smoke dust and solid suspended matters in the flue gas, realizing a front collision type water film dust removal method, generating mud and water, and discharging the mud and water into a mud and water precipitation chamber through a mud and water pipe 302 for mud and water separation after a period of time; the top wall of the water film treatment chamber is also connected with a flushing high-pressure pump 10 through a pipeline, the flushing high-pressure pump 10 is connected with a high-pressure air spray pipe 401, one end of the high-pressure air spray pipe 401 is connected on the top wall of the water mist smoke washing box 4 in a penetrating way, the outlet of the high-pressure gas spray pipe 401 is vertically downward, the water mist smoke washing box 4 is divided into a shallow water area and a deep water area by a drooping partition plate 402, the height of an outer box of the shallow water area is larger than that of an outer box of the deep water area, the high-pressure gas spray pipe 401 is arranged on the top wall of the shallow water area, the bottom wall of the shallow water area is provided with a slope block 403, a third overflow pipe 404 is arranged on one side wall of the shallow water area, the distance between the outlet at the bottom end of the high-pressure gas spray pipe 401 and the liquid level of the shallow water area is 0.5-1cm, the bottom edge of the drooping partition plate 402 extends into the liquid level and has a gap with the slope block 403, the bottom of the side wall of the deep water area is provided with a third sewage discharge pipe 405, the top wall of; after the medium-humidity flue gas subjected to water film dedusting treatment is pressurized by a flushing high-pressure pump 10, huge impact is caused on the liquid level of a shallow water area and sputtering is generated, wherein most dust particles are remained in water after being increased in weight or adhered to the water, and the stage is an impact stage; after the stage is generated, the water surface forms a parabolic water drop, water mist and foam area due to the movement of gas, and the dust-containing gas is further purified by the water drop and water mist in the area, which is a water spraying bath stage; when the dust enters the equipment, the temperature of the flue gas is very high, water mist is formed under the impact of the flue gas in the cylinder, dust particles are further purified by the water mist when changing directions and moving upwards, and the stage is atomizing dust removal; after the three modes are used for purification, an impact type water bath dust removal structure is formed, and dust parts in smoke are further removed; pipe chute 407 one end intercommunication has snakelike condenser pipe 501, the top position at 5 lateral walls of water gas separator box is erect to snakelike condenser pipe 501 one end opening, snakelike condenser pipe 501 other end opening erects on 5 roof of water gas separator box, snakelike condenser pipe 501's bottom is equipped with waterlogging caused by excessive rainfall hole 502, be equipped with V-arrangement basin 503 under the waterlogging caused by excessive rainfall hole 502, V-arrangement basin 503 bottom rigid coupling is on 5 diapalls of water gas separator box, and the one end export of V-arrangement basin 503 stretches out outside the lateral wall of water gas separator box 5, the snakelike condenser pipe 501 opening dustcoat that is located 5 roof departments of water gas separator box is equipped with chimney exit 504, the top of chimney exit 504 is equipped with unpowered hood 505. After the impact type water bath dust removal treatment, the flue gas with ultrahigh humidity is generated and cooled, and the flue gas is relatively clean gas after being condensed and drained by the snake-shaped condensation pipe 501, can be directly discharged into the air, and is automatically thrown and taken off by utilizing the temperature and air pressure difference, so that most of moisture is further removed.
Referring to fig. 1, the top of the filter tank 2 is also provided with a pressure pump, the filter plate frame 201 removes sludge in water by adopting a plate-frame filter pressing method of 0.3-0.4MPa, and the sludge on the filter plate frame 201 is cleaned at intervals.
Referring to fig. 1, the wastewater inlet pipe 102, the first drain pipe 103, the water pumping pipe 104, the first overflow pipe 101, the water filtering pipe 202, the mud pipe 302, the second drain pipe 304, the second overflow pipe 305, the flue gas inlet pipe 309, the high pressure gas injection pipe 401, the third overflow pipe 404, the water replenishing pipe 406 and the inclined pipe 407 are respectively provided with an electromagnetic valve for controlling the opening and closing of each pipeline.
Referring to fig. 1, the water replenishing pipe 406 is connected to the municipal industrial water supply system, and the water in the V-shaped water tank 503 is returned to the mist washing smoke box 4 through the water pump and the water replenishing pipe 406, so as to realize partial circulation of the condensed water, and if the condensed water is not enough to maintain the water level in the mist washing smoke box 4, a relatively clean water body needs to be provided from the municipal water supply system.
Referring to fig. 1, the third overflow pipe 404 is discharged above the filter plate frame 201 through a water pump and a spray pipe for flushing the filter plate frame 201.
Referring to fig. 1, the first overflow pipe 101 communicates with the upper side of the filter plate frame 201 to maintain the filter plate frame 201 in a wet state for a long time.
Referring to fig. 1, the water discharge of the filtered water pipe 202 has two methods:
firstly, water in the filtering water pipe 202 is discharged into the wastewater sedimentation tank 1 through a water pump and a pipeline, and when wastewater is not supplied timely, water can be temporarily supplied for subsequent water film dust removal and flushing water bath dust removal through the filtering water pipe 202;
and secondly, the water in the filtering water pipe 202 is discharged to a subsequent flocculation tank and an oxidation tank through a water pump and a pipeline for directly carrying out wastewater treatment.
The above two methods are based on whether the water in each part of the dust removing device is sufficient, the first method is adopted when the water is insufficient, the second method is adopted when the water is excessive, and the specific replacement method is that the discharge position of the filtered water pipe 202 is manually adjusted.
Referring to fig. 1, the side walls of the wastewater sedimentation tank 1, the filtering tank 2, the flue gas washing tank 3, the water mist smoke washing box 4 and the water-gas separation box 5 are respectively provided with an observation glass strip for observing the water level and sludge deposition condition of each component, so as to realize timely water replenishing, water draining and pollution discharge treatment.
From the above, the invention relates to the processes of wastewater utilization and sludge-water separation, so that the invention is a batch process, and provides a dust removal method, which comprises the following steps:
1) and (3) wastewater precipitation: discharging the wastewater of the smelting plant into a wastewater sedimentation tank 1, adding a precipitator, aging for 10min, and discharging the sludge at the bottom onto a filter plate frame 201 for filtering when the sludge is thick;
2) water pumping and spraying: spraying the supernatant clear liquid precipitated in the wastewater sedimentation tank 1 into the flue gas washing tank 3 by a water pump 6, a three-way valve 7 and a spray head 8 until the stirring paddle 308 is just submerged by the water level;
3) water film dedusting: starting a high-speed motor 307 at the rotating speed of 2000-3000r/min, starting a flue gas inlet pipe 309 to enable the direction of the flue gas to be opposite to the rotating direction of a stirring paddle 308, forming a water film on the inner surface of a conical plate 301, enabling the flue gas to collide with the water film in the front and bubble, spraying by a spray header 8, and discharging the obtained gas into a water mist smoke washing box 4 after being pressurized by a water flushing high-pressure pump 10;
4) separating mud from water: when the concentration of the muddy water is high, the muddy water pipe 302 and the mud scraping mechanism 303 are opened, the muddy water is gradually scraped to the second sewage discharge pipe 304 and is discharged onto the filter plate frame 201 for filtering, the generated clear liquid returns to the spray header 8 through the second overflow pipe 305 and the reflux pump 9, the flowing direction of the three-way valve 7 needs to be frequently changed for ensuring the continuous flow of the flue gas, namely the water pump 6 is ensured to continuously add water for flowing and the reflux pump 9 is not used for flowing when the muddy water pipe 302 is opened for sewage discharge; when the sewage in the muddy water pipe 302 is completely discharged, closing the muddy water pipe 302, starting the mud scraping mechanism 303 to work for 2-3min, basically scraping the bottom mud, then opening the second sewage discharge pipe 304 to discharge the mud, then closing the second sewage discharge pipe, then opening the reflux pump 9 to restore the water level of the muddy water sedimentation chamber to the original position, and then quickly closing the second overflow pipe 305;
5) water-flushing type water bath dust removal: the flushing high-pressure pump 10 is started to enable the smoke to flush the liquid level of the water mist smoke washing box 4 at a short distance and high speed to generate sputtering, water mist can be generated due to the fact that the smoke has a certain temperature, water drops, water mist and foam areas are generated, dust particle parts in the smoke are fully absorbed, sewage is obtained and guided to a deep water area through the slope block 403 to be deposited, sludge is discharged through the third blow-off pipe 405 when the sludge reaches a certain thickness, the sludge is supplemented through the water supplementing pipe 406 when the moisture is insufficient, and the sludge is discharged through the third overflow pipe 404 when the moisture is excessive;
6) water-gas separation: the ultrahigh-humidity gas generated in the step 5) is condensed at normal temperature by the serpentine condenser pipe 501, drained through the draining holes 502, and finally further thrown and dewatered by the unpowered hood 505 and then discharged into the atmosphere or enters a next flue gas treatment system.
The invention is to apply the waste water to the water film dust removal treatment directly after the preliminary precipitation, its purpose is to regard waste water as the first step wash water, thus has saved the wash water consumption in the flue gas treatment, and in the course of discharging the daily flue gas, the flue gas temperature is higher and is not suitable for discharging directly, therefore utilize waste water and high-temperature flue gas to collide and contact in the front, produce the steam of the waste water, can humidify the flue gas by a wide margin, and utilize the flushing type water bath to remove dust after humidifying, further cool down the flue gas, get the flue gas of the ultra-high humidity, promote the fast settling and dust and gas separation of the dust in the flue gas, therefore can get the clean gas through cooling;
on the other hand, the waste water can fully absorb heavy metal ions and the like in the waste water and promote the sedimentation of the waste water after absorbing dust in the flue gas, so that the waste water is filtered to obtain thicker sludge and clearer treatment liquid, the sludge and the clearer treatment liquid can be respectively treated in a centralized manner, the reduction treatment process of the waste water is realized, and the popularization value is realized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A dust removal device for cooling smelting furnace flue gas by utilizing waste water comprises a waste water sedimentation tank (1), a filter tank (2), a flue gas washing tank (3), a water mist smoke washing box (4) and a water vapor separation box (5), and is characterized in that a first overflow pipe (101) is arranged on the upper portion of the side wall of the waste water sedimentation tank (1), a waste water inlet pipe (102) is communicated with the middle portion of the side wall of the waste water sedimentation tank (1), a first drain pipe (103) is arranged on the bottom wall of the waste water sedimentation tank (1), the outlet at the bottom end of the first drain pipe (103) is positioned right above the top opening of the filter tank (2), a water suction pipe (104) is arranged near the position below the liquid level of the waste water sedimentation tank (1), the top end of the water suction pipe (104) extends out of the liquid level and is connected with a water suction pump (6), the water suction pump (6) is connected with, the second end of the three-way valve (7) is communicated with the top wall of the flue gas washing tank (3) through a pipeline and is connected with a spray header (8), and the third end of the three-way valve (7) is connected with a reflux pump (9) through a pipeline;
a filter plate frame (201) is erected at the middle upper part of the filter tank (2), and a filter water pipe (202) is arranged at the bottom of the side wall of the filter tank (2);
the flue gas washing tank (3) middle part is equipped with tapered plate (301), tapered plate (301) separate flue gas washing tank (3) into the water film treatment chamber on upper portion and the muddy water precipitation chamber of lower part, tapered plate (301) form and leak hopper-shaped recess, the central point of tapered plate (301) puts the intercommunication has muddy water pipe (302), the upper surface of muddy water precipitation chamber diapire is equipped with scrapes mud mechanism (303), one side position of muddy water precipitation chamber diapire is equipped with second blow off pipe (304), second blow off pipe (304) bottom outlet is located filtering ponds (2) open-top position directly over, it includes the belt that is cup jointed by two belt rollers to scrape mud mechanism (303), the belt roller erects on the both sides wall of flue gas washing tank (3), one of them the belt roller is connected with the low-speed motor, the surface equidistance of belt is provided with the sieve mesh scraper blade, the sieve pore scraper at the lower part of the belt is in soft contact with the upper surface of the bottom wall of the muddy water precipitation chamber, namely, the muddy water is gradually scraped to the opening part of the second sewage discharge pipe (304) through the sieve pore scraper to complete the separation of the muddy water;
a second overflow pipe (305) is arranged at the upper part of the side wall of the muddy water precipitation chamber, the second overflow pipe (305) is communicated with a reflux pump (9), and after the muddy water is separated and precipitated for a period of time, the waste water from which the mud is separated can be returned to the water film treatment chamber through a three-way valve (7), so that the water circulation is realized, and the water consumption is saved;
the water film treatment chamber is characterized in that a stirring shaft (306) penetrates through the center of the top wall of the water film treatment chamber, the top end of the stirring shaft (306) is connected with a high-speed motor (307), a stirring paddle (308) is fixedly connected to the bottom end of the stirring shaft (306), the outer contour of the stirring paddle (308) is a funnel-shaped V rod which is basically parallel to the surface of the conical plate (301), the distance between the stirring paddle (308) and the inner surface of the conical plate (301) is 5-10cm, a flue gas inlet pipe (309) is arranged at the upper part of the outer surface of the conical plate (301), the flue gas inlet pipe (309) is horizontally arranged and the air inlet direction is tangent to the cambered surface of the conical plate (301), the rotating direction of the stirring paddle (308) is controlled to be just opposite to the air inlet direction of the flue gas inlet pipe (309), namely, the front collision of water is realized, and the wastewater is driven to rotate at a high speed along with the, a water film rotating at a high speed is formed on the inner surface of the conical plate (301), the water film flowing directions of the flue gas and the waste water are basically opposite, the smoke dust and the solid suspended matters in the flue gas are continuously absorbed, the front collision type water film dedusting method is realized, muddy water is generated, and the muddy water is discharged into a muddy water settling chamber through a muddy water pipe (302) for muddy water separation after a period of time;
the top wall of the water film treatment chamber is also connected with a water flushing high-pressure pump (10) through a pipeline, the water flushing high-pressure pump (10) is connected with a high-pressure air spray pipe (401), one end of the high-pressure air spray pipe (401) is connected on the top wall of the water mist smoke washing box (4) in a penetrating mode, the outlet of the high-pressure air spray pipe (401) is perpendicular downward, the water mist smoke washing box (4) is divided into a shallow water area and a deep water area through a drooping partition plate (402), the height of an outer box of the shallow water area is larger than that of an outer box of the deep water area, the high-pressure air spray pipe (401) is arranged on the top wall of the shallow water area, a slope block (403) is arranged on the bottom wall of the shallow water area, a third overflow pipe (404) is arranged on one side wall of the shallow water area, the distance between the bottom end outlet of the high-pressure air spray pipe (401) and the liquid level of the shallow water area is 0.5-, a third sewage discharge pipe (405) is arranged at the bottom of the side wall of the deep water area, a water replenishing pipe (406) is further arranged on the top wall of the shallow water area, and an inclined pipe (407) is arranged at the upper part of the drooping partition plate (402);
after being pressurized by a flushing high-pressure pump (10), the medium-humidity flue gas subjected to water film dedusting treatment causes huge impact on the liquid level of a shallow water area and generates sputtering, wherein most dust particles are remained in water after being increased in weight or adhered to the water, and the stage is an impact stage; after the stage is generated, the water surface forms a parabolic water drop, water mist and foam area due to the movement of gas, and the dust-containing gas is further purified by the water drop and water mist in the area, which is a water spraying bath stage; when the dust enters the equipment, the temperature of the flue gas is very high, water mist is formed under the impact of the flue gas in the cylinder, dust particles are further purified by the water mist when changing directions and moving upwards, and the stage is atomizing dust removal; after the three modes are used for purification, an impact type water bath dust removal structure is formed, and dust parts in smoke are further removed;
one end of the inclined pipe (407) is communicated with a snake-shaped condensation pipe (501), one end of the snake-shaped condensation pipe (501) is erected at the top of one side wall of the water-gas separation box (5) in an opening mode, the other end of the snake-shaped condensation pipe (501) is erected on the top wall of the water-gas separation box (5) in an opening mode, a water draining hole (502) is formed in the bottom of the snake-shaped condensation pipe (501), a V-shaped water tank (503) is arranged under the water draining hole (502), the bottom of the V-shaped water tank (503) is fixedly connected to the bottom wall of the water-gas separation box (5), an outlet at one end of the V-shaped water tank (503) extends out of the side wall of the water-gas separation box (5), a chimney outlet (504) is formed in an opening cover of the snake-shaped condensation pipe (501) located on the top wall of;
after the processing of impacted style water-bath dust removal, produce the flue gas of ultrahigh humidity to obtain the cooling, after snakelike condenser pipe (501) condensation waterlogging caused by excessive rainfall, obtain cleaner gas, can directly discharge in the air, then utilize temperature and atmospheric pressure difference, get rid of the flue gas automatically and take off, further get rid of most moisture.
2. The dust removal device for cooling the smoke of the smelting furnace by using the waste water according to claim 1, wherein a pressure pump is further arranged at the top of the filter tank (2), the filter plate frame (201) is used for removing sludge in water by adopting a plate-frame filter pressing method of 0.3-0.4MPa, and the sludge on the filter plate frame (201) is cleaned at intervals.
3. The dust removing device for cooling the smoke of the smelting furnace by using the wastewater as claimed in claim 1, wherein the wastewater inlet pipe (102), the first sewage outlet pipe (103), the water pumping pipe (104), the first overflow pipe (101), the filtering water pipe (202), the muddy water pipe (302), the second sewage outlet pipe (304), the second overflow pipe (305), the smoke inlet pipe (309), the high pressure air injection pipe (401), the third overflow pipe (404), the water replenishing pipe (406) and the inclined pipe (407) are respectively provided with an electromagnetic valve for controlling the on and off of each pipeline.
4. The dust removing device for cooling the smoke of the smelting furnace by using the waste water according to the claim 1, characterized in that the water replenishing pipe (406) is connected with a municipal industrial water supply system, the water in the V-shaped water tank (503) is returned to the water mist smoke washing tank (4) through the water pump and the water replenishing pipe (406), so as to realize the partial circulation of the condensed water, and if the condensed water is not enough to maintain the water level in the water mist smoke washing tank (4), a cleaner water body is required to be provided from the municipal water system.
5. The dust removing device for cooling the smoke of the smelting furnace by using the waste water according to claim 1, wherein the third overflow pipe (404) is discharged above the filtering plate frame (201) through a water pump and an injection pipe for flushing the filtering plate frame (201).
6. The dust removing device for cooling the smoke of the smelting furnace by using the waste water according to claim 1, wherein the first overflow pipe (101) is communicated above the filtering plate frame (201) and is used for maintaining the filtering plate frame (201) in a long-term wet state.
7. The dust removing apparatus for cooling a flue gas of a smelting furnace using waste water according to claim 1, wherein the water discharge of the filtered water pipe (202) has two methods:
firstly, water in the filtering water pipe (202) is discharged into a wastewater sedimentation tank (1) through a water pump and a pipeline, and when the wastewater is not supplied timely, water can be temporarily supplied for the subsequent water film dust removal and water bath dust removal through the filtering water pipe (202);
secondly, the water of the filtering water pipe (202) is discharged to a subsequent flocculation tank and an oxidation tank through a water pump and a pipeline for directly carrying out wastewater treatment;
the two methods are that whether the water in each part of the dust removing device is sufficient or not is judged, the first method is adopted when the water is insufficient, the second method is adopted when the water is excessive, and the specific replacement method is that the discharge position of the filtered water pipe (202) is manually adjusted.
8. The dust removing device for cooling the smoke of the smelting furnace by using the wastewater as claimed in claim 1, wherein the side walls of the wastewater sedimentation tank (1), the filter tank (2), the smoke washing tank (3), the water mist smoke washing box (4) and the water-gas separation box (5) are respectively provided with an observation glass strip for observing the water level and the sludge deposition condition of each component so as to realize timely water replenishing, water discharging and pollution discharge treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010747880.4A CN111974123A (en) | 2020-07-30 | 2020-07-30 | Dust removal device for cooling smoke of smelting furnace by using waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010747880.4A CN111974123A (en) | 2020-07-30 | 2020-07-30 | Dust removal device for cooling smoke of smelting furnace by using waste water |
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| Publication Number | Publication Date |
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| CN111974123A true CN111974123A (en) | 2020-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010747880.4A Withdrawn CN111974123A (en) | 2020-07-30 | 2020-07-30 | Dust removal device for cooling smoke of smelting furnace by using waste water |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112495100A (en) * | 2020-12-31 | 2021-03-16 | 安徽华塑股份有限公司 | Utilize filterable airtight calcium carbide stove tail gas deep purification equipment of mud net |
| CN112549491A (en) * | 2020-11-25 | 2021-03-26 | 石家庄熙荣机械有限公司 | Environment-friendly production line is used in plastic products processing |
| CN112999793A (en) * | 2021-04-09 | 2021-06-22 | 四川安浪家纺有限责任公司 | Continuous blowing dust collector |
| CN116899391A (en) * | 2023-07-03 | 2023-10-20 | 江苏苏力机械股份有限公司 | Exhaust gas treatment circulation system for vehicle paint spray booth |
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2020
- 2020-07-30 CN CN202010747880.4A patent/CN111974123A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112549491A (en) * | 2020-11-25 | 2021-03-26 | 石家庄熙荣机械有限公司 | Environment-friendly production line is used in plastic products processing |
| CN112495100A (en) * | 2020-12-31 | 2021-03-16 | 安徽华塑股份有限公司 | Utilize filterable airtight calcium carbide stove tail gas deep purification equipment of mud net |
| CN112495100B (en) * | 2020-12-31 | 2022-12-16 | 安徽华塑股份有限公司 | Utilize filterable airtight calcium carbide stove tail gas deep purification equipment of mud net |
| CN112999793A (en) * | 2021-04-09 | 2021-06-22 | 四川安浪家纺有限责任公司 | Continuous blowing dust collector |
| CN116899391A (en) * | 2023-07-03 | 2023-10-20 | 江苏苏力机械股份有限公司 | Exhaust gas treatment circulation system for vehicle paint spray booth |
| CN116899391B (en) * | 2023-07-03 | 2024-01-30 | 江苏苏力机械股份有限公司 | Exhaust gas treatment circulation system for vehicle paint spray booth |
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