CN110860169A - Magnetic material drying kiln flue gas purification treatment device and treatment method - Google Patents
Magnetic material drying kiln flue gas purification treatment device and treatment method Download PDFInfo
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Abstract
The invention relates to a flue gas purification treatment device for a magnetic material drying kiln, which comprises a high-temperature centrifugal fan, a primary water spraying washing tower, a secondary water spraying washing tower, a low-pressure cyclone separation demister, an automatic cleaning bipolar wet electrostatic tower, a high-exhaust chimney, an equipment mounting platform, a demister drain valve and a circulation pool, wherein the low-pressure cyclone separation demister and the automatic cleaning bipolar wet electrostatic tower are mounted on the equipment mounting platform, the high-temperature centrifugal fan is sequentially connected with the primary water spraying washing tower, the secondary water spraying washing tower, the low-pressure cyclone separation demister, the automatic cleaning bipolar wet electrostatic tower and the high-exhaust chimney through pipelines, and the low-pressure cyclone separation demister is provided with the demister drain valve. The device can quickly, efficiently and thoroughly purify oil stain, smoke, dust particles, harmful gas, peculiar smell and the like in the smoke of the magnetic material drying kiln, and the smoke dust purification efficiency of the whole system reaches more than 99 percent.
Description
Technical Field
The invention relates to a treatment device, in particular to a flue gas purification treatment device for a magnetic material drying kiln, and belongs to the technical field of waste gas treatment.
Background
The iron and steel combined production enterprises all have production lines of the whole flow of sintering, steel making, steel rolling and cold rolling, wherein the hot rolling production line produces an iron scale byproduct (hot rolling scale for short) in the production process, and the large-scale iron and steel combined enterprises have two types of removal for the iron scale byproduct, wherein one type is that partial iron scale is sintered and returned to production and utilization, and the other type is that the iron scale is deeply processed, a low-value iron scale is converted into a high-value permanent magnetic ferrite pre-sintering material, and a downstream user produces a permanent magnetic ferrite device from the pre-sintering material, and the permanent magnetic ferrite device is widely applied to the industrial fields of computers, electronic devices, communication, automobiles, aerospace and the like and daily necessities of household appliances and the like; with the rapid development of the world economy and scientific technology, the demand of magnetic materials is unprecedentedly wide.
The hot rolling scale is generated by oxidation on a hot rolling billet, falls into a hot rolling circulating flushing water trench in the process and then enters a centralized sedimentation tank, and is conveyed to a magnetic material area by a slag grabbing crane, and the components of the scale are mainly shown in a table 1:
| name (R) | Total iron (Fe2o3, Fe3o4, Feo) | Water content | Dust | Oil and fat | Others |
| Hot rolled iron scale | 82％ | 12.5％ | 3.6％ | 0.02％ | 1.8％ |
TABLE 1 composition of hot-rolled iron scale
The production process flow of a common magnetic material factory, such as the process flow of the permanent magnetic ferrite pre-sintering material of the magnetic material of mei steel company, is mainly as follows: hot rolling iron scale → drying → fine grinding → oxidation → batching → balling → sintering → fine grinding → pre-burning material → detection →
Qualified delivery, wherein the drying is the first process of the production line, and mainly dries and removes the hot rolling iron scale containing water and oil,
is a subsequent process
And (4) producing and preparing qualified iron scale raw materials.
Drying hot-rolled iron scale by the plum steel magnetic material through a drying kiln, and mainly removing water in the plum steel magnetic material; the production process of the drying kiln comprises the following steps: hot rolling iron scale → hopper → elevator → kiln head cabin → disc feeder → drying kiln → cooling cylinder → storage bin, the drying kiln is rotary internal heating type, the inclination angle of the drying kiln is 1.5 per mill, the drying kiln is fed by the kiln tail and the flue gas is discharged, the kiln head is provided with a heating burner and the discharge is carried out;
the capacity of the plum steel magnetic material drying kiln is about 10 tons/hour, the length and the diameter of the drying kiln are phi 1.8 multiplied by 14m, the average drying process temperature is 300-400 ℃, the iron scale discharging temperature is about 100 ℃, flue gas is exhausted from the kiln tail to the atmosphere through a main exhaust fan, and the temperature distribution of the flue gas from a kiln head burner to the kiln tail is shown in a table 2:
TABLE 2 composition of hot-rolled iron scale
At present, the production process of the drying kiln in the same industry in China basically adopts the internal heating type production process method, iron scale is heated in the rotary kiln and gradually moves towards the kiln head direction materials, the materials absorb heat and evaporate water into smoke, meanwhile, as the iron scale is mixed with grease, part of the grease is burnt in a high-temperature area at the kiln head of the drying kiln, but the iron scale at the kiln inlet end is also evaporated into the smoke as the grease can not reach the burning point. Therefore, the smoke contains high concentration of water, oil and dust, and the smoke smell generated by incomplete combustion of the oil smoke is heavier, so that if the smoke is directly discharged into the atmosphere, the atmospheric pollution and the environmental protection are deteriorated; in addition, the flue gas is gradually cooled in the air pipe, part of water vapor is gradually condensed, and then part of oil and dust are deposited and adsorbed on the inner wall of the air pipe, so that the sedimentation and the blockage of the air pipe are gradually caused, and the normal production of the drying kiln is also influenced.
With the higher and higher requirements of China and places on air pollution prevention and control, the emission standard of kiln gas of enterprises is stricter and stricter, and the emission of organized discharge ports must meet the requirement of ultralow emission. At present, the flue gas purification treatment way of the magnetic material drying kiln in the industry and the flue gas purification treatment way of other similar kilns are roughly as follows:
①, drying kiln smoke and a kiln tail settling box, the processing mode is simple, dust fall is carried out by settling in the settling box under the action of the gravity of dust in the smoke, but only large-particle dust is settled due to large flow velocity of the smoke, fine powder is still extracted, and the concentration of the dust processed by the mode is basically more than 2000mg/m 3.
②, a drying kiln smoke and cyclone dust collector mode is basically similar to the drying kiln smoke and kiln tail settling box mode, the smoke can only settle large particle dust after passing through a spiral guide plate, meanwhile, as the drying kiln smoke contains a large amount of water vapor, the dust in the cyclone dust collector is gradually accumulated and silted up along with the gradual condensation of partial water vapor, the flow of an air duct and air current is influenced, in addition, the cyclone dust collection is more suitable for the use under the condition of dry smoke, and is basically not suitable for the smoke of a magnetic drying kiln.
③, a drying kiln smoke and an air pipe are inserted into a water spraying mode, the spraying mode adopts the mode that a water pipe and a spray head are additionally arranged on a smoke exhaust pipe, water mist atomizes and deposits dust, but due to the limit of atomization of flow velocity and pipe diameter space, the dust removal effect is good, but the pipeline is seriously silted up, and the concentration of the dust treated by the mode is basically between 300 and 400mg/m 3.
④, drying kiln flue gas + cooling spray tower mode, this dust fall mode is generally adopted in industry, it is in drying kiln flue gas + air duct insert water spray mode further upgrade and optimization, mainly the flue gas is in the spray tower, the flue gas reduces the velocity of flow, and spray atomizing and wash, atomize most dust particle and subside, and bring out the spray tower through the circulating water, this mode shortcoming is that the water consumption is big (to 10000m3 standard state flue gas, should reach about 100mg/m3 dust emission requirement, the circulating water yield is at 60-80 tons/hour), fine granule (is less than or equal to 0.2um) can't effective dust fall at the same time, the dust emission concentration after this mode is handled is about 100mg/m3 basically.
⑤, drying kiln smoke + direct static way, the dust fall way is less adopted in the industry, mainly through high voltage static way to absorb the dust particle in the smoke, the way has the defect that the static dust removal efficiency is about 90%, if the initial dust concentration of the drying kiln tail smoke is about 1000mg/m3, the dust emission concentration is about 100mg/m3 after the direct static purification treatment, and the difference with the current atmospheric environmental protection dust emission requirement is still existed.
As the construction of the plum steel magnetic material drying kiln is earlier, flue gas of the drying kiln is purified at the beginning, spray water is added into an air pipe in front of a main exhaust fan for settling dust, the air pipe is cleaned and desilted every day, and the production is maintained; the production emissions measurements are given in table 3 below.
TABLE 3 flue gas emission measurement
According to the data in table 3, especially dust particles far exceed national and local emission requirements, the improvement of dust removal technology and the upgrading of process equipment must be carried out, and a magnetic material drying kiln flue gas purification treatment technology and process technology equipment which are simple in structure, safe and reliable are designed for the improvement.
Disclosure of Invention
The invention provides a flue gas purification treatment device and a flue gas purification treatment method for a magnetic material drying kiln, aiming at the problems in the prior art, the technical scheme has compact and ingenious overall structure design, and can rapidly, efficiently and thoroughly purify oil stain, smoke, dust particles, harmful gas, peculiar smell and the like in the flue gas of the magnetic material drying kiln by comprehensive application and technical integration of primary water spray washing, secondary water spray washing, a low-pressure cyclone separation demister, an automatic cleaning bipolar wet electrostatic tower and the like, and the flue gas and dust purification efficiency of the whole system reaches more than 99 percent.
In order to achieve the purpose, the technical scheme of the invention is that the flue gas purification treatment device for the magnetic material drying kiln is characterized by comprising a high-temperature centrifugal fan 2, a primary water spraying and washing tower 3, a secondary water spraying and washing tower 4, a low-pressure cyclone separation demister 5, a defogging filter sheet 6, a high-pressure wet-type electrostatic tower 7, a secondary high-pressure electrostatic motor set 8, a wet-type electrostatic automatic spraying and washing device 9, an automatic washing water pump 10, a washing circulating water tank 11, an automatic washing water return pipe 12 and a high-exhaust chimney 13, wherein the low-pressure cyclone separation demister 5 and the automatic washing bipolar wet-type electrostatic tower 7 are arranged on an equipment installation platform, and the high-temperature centrifugal fan 2 is sequentially connected with the primary water spraying and washing tower 3, the secondary water spraying and washing tower 4, the low-pressure cyclone separation demister 5, the defogging filter sheet 6, the high-pressure wet-type electrostatic tower 7, the high, The high-pressure wet-type static tower comprises a two-stage high-pressure static motor set 8 and a high-exhaust chimney 13, wherein static tower automatic cleaning water return pipes 12 are arranged on the high-pressure wet-type static tower 7 and the two-stage high-pressure static motor set 8.
As an improvement of the invention, each of the first-stage and second-stage water spraying washing towers comprises two layers of washing and purifying chambers, each layer of washing and purifying chamber is internally composed of a spraying pipe and a filtering material, spraying water in a circulating water tank is lifted by an external pump and is sprayed in the two layers of washing and purifying chambers after being diffused by an atomizing nozzle, and waste gas can be fully contacted with water mist after being introduced into the washing and purifying chambers due to water mist and wall impact splashing, so that large dust particles, oil mist and VOC harmful components in the waste gas are absorbed to the maximum extent.
As an improvement of the invention, the high-pressure wet electrostatic tower of the automatic cleaning bipolar wet electrostatic tower internally comprises a honeycomb-shaped high-pressure adsorption electric field, and the 380V voltage is boosted to 70000V through a high-pressure voltage transformation system, so that the high-efficiency charging, dehydration and dust removal are realized. The secondary high-voltage electrostatic motor set is internally provided with a stainless steel mesh for manufacturing and processing an electrostatic adsorption cylinder, and smoke passes through a high-voltage electrostatic area to efficiently adsorb smoke dust particles. The wet static electricity adopts an automatic spray cleaning device, adopts a water pump to circularly spray, and the circulating water returns to a circulating water tank.
As an improvement of the invention, the low-pressure cyclone separation demister adopts a mesh disc centrifugal filtration design, and water mist is thrown and removed by rotating the impeller at a high speed. The defogging filter sheet is processed and manufactured by adopting a high-density stainless steel wire mesh, the dense steel wires form a blocking net, and the smoke containing humidity is condensed into water drops after passing through the blocking net, and is dewatered and dedusted.
As an improvement of the invention, the high-smoke chimney is made of A3 steel and is used for high-altitude smoke discharge. The chimney is equipped with a standard exhaust gas collection detection port.
A flue gas purification treatment method for a magnetic material drying kiln comprises the following steps:
step 1: drying kiln smoke and a main exhaust fan;
step 2: a first stage and a second stage water spraying washing stage;
and step 3: a low-pressure cyclone separation demisting section;
and 4, step 4: automatically cleaning the bipolar wet-type electrostatic section;
and 5: a high calandria chimney section.
As a modification of the present invention, the step 1: drying kiln flue gas, main air exhauster, specifically as follows, kiln stoving air inlet adopts circular A3 steel flange joint, adopts the middling pressure centrifugal fan of reasonable match power through high temperature centrifugal fan 2 for the waste gas source is collected.
As a modification of the present invention, the step 2: one, second grade water sprays the washing section, specifically as follows, one-level, second grade water sprays the scrubbing tower, every tower all comprises two-layer washing clean room, every layer of washing clean room is inside all to be become by shower and filter material, the shower water in the circulating water pond promotes through outside pump, sprinkle in two-layer washing clean room after the atomizer diffusion, because water smoke and wall impact splash, make waste gas by letting in wash purify in can fully contact with water smoke, the biggest dust particulate matter in the absorption waste gas of at utmost, oil mist and VOC harmful component.
As a modification of the present invention, the step 3: the low-pressure cyclone separation demisting section comprises the following specific steps: the gas-liquid mixture with high flow velocity is introduced into the cylinder body through the cutting direction of the cyclone wheel to generate rotary motion, water drops are thrown to the cylinder wall under the action of centrifugal force and enter the outer layer liquid collecting cavity through a plurality of liquid collecting holes in the cylinder wall, so that vapor and liquid are separated preliminarily, separated sewage flows into the liquid storage tank through the liquid guiding holes on the periphery of the cylinder bottom, the defogging filter plate is processed and manufactured by adopting a high-density stainless steel wire mesh, a blocking net is formed by dense steel wires, and moisture-containing smoke is condensed into water drops after passing through the defogging filter plate, and is dewatered and dedusted.
As a modification of the present invention, the step 4: the automatic cleaning bipolar wet-type electrostatic section is characterized in that a high-voltage wet-type electrostatic tower adopts high-voltage corona discharge to charge dust, the charged dust reaches a dust collecting plate/pipe under the action of an electric field force, a second-stage high-voltage electrostatic motor set wire mesh electrostatic bag dust removing section is additionally arranged at the top of wet-type electrostatic tower, a wire mesh electrostatic bag dust removing power supply control and a wet-type electrostatic power supply control are separated, the voltage is distributed in high and low levels, the charged smoke removing and purifying efficiency is high, automatic spraying cleaning is additionally arranged in equipment, the dust is removed along with the flow of flushing water in a regular flushing mode, a water pump is adopted for circulating spraying of the system, and circulating water returns to a
Compared with the prior art, the invention has the advantages that 1) the system of the technical scheme has the flue gas purification effect of more than 99 percent, basically has no smoke emission by visual inspection, and shows that the concentration of dust particles at the outlet is less than 5mg/m3 according to detection data, and the requirement of national ultra-low emission standard (less than or equal to 10mg/m3) is met;
2) the processing flow of the scheme is as follows: drying kiln flue gas → main exhaust fan → primary spray → secondary spray → dehydration defogging → electrostatic tower → high calandria (chimney), is the integration of purification and dust removal technology and equipment. The single purification and dust removal treatment means cannot effectively and thoroughly remove oil stains, smoke, dust particles and the like in the smoke of the magnetic material drying kiln, and cannot meet the requirement of ultralow emission; by the method, the dust purification efficiency of the comprehensive flue gas purification and dust removal system reaches more than 99 percent;
(1020-2.6)/1020*100％＝99.75％
3) the design that drying kiln flue gas was through two-stage water spraying washing, and circulating water yield ability is 40 tons/hour, sprays 8 atomizer of group of scrubbing tower internally mounted, carries out high-efficient washing, is the coarse purification section of the whole flue gas treatment of flue gas, effectively deposits the dust of big granule in the flue gas, and the dust purification efficiency of coarse purification section is:
(843-181)/843*100％＝78.53％；
4) the efficient dehydration demister is matched for use, the device is selected to be SCGF-120 type, moisture and large-particle grease in flue gas can be effectively removed, and follow-up electrostatic safe operation is guaranteed. The dust purification efficiency of the section is as follows:
(181-130)/181*100％＝28.18％
5) the bipolar wet-type electrostatic tower is a WESP-120 type, and is internally provided with a honeycomb-shaped high-voltage adsorption electric field and an electric bag dust removal module to further purify fine dust particles in flue gas and carry out charged adsorption, so that the dust in the flue gas is thoroughly removed, and the ultralow emission is achieved. The dust purification efficiency of the section is as follows:
(130-2.6)/130*100％＝98.0％
6) and the top of the electrostatic tower is provided with a wire mesh electric bag dust removal section which is a fine purification section for treating the whole flue gas of the flue gas, and 4 groups of modular structures are adopted, so that the selective use and the daily cleaning and maintenance can be optimized.
7) And the bipolar wet-type electrostatic tower adopts an automatic spraying cleaning device to regularly and automatically wash the fine particles adsorbed on the electrode plate.
Drawings
FIG. 1 is a schematic view of the overall structural arrangement of the present invention;
FIG. 2 is a schematic process flow diagram of the present invention;
in the figure: 1. the device comprises a kiln drying air inlet, a high-temperature centrifugal fan, a first-stage water spraying washing tower, a second-stage water spraying washing tower, a low-pressure cyclone separation demister, a high-temperature centrifugal fan.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1, the flue gas purification treatment device for the magnetic material drying kiln comprises a high-temperature centrifugal fan 2, a primary water spraying and washing tower 3, a secondary water spraying and washing tower 4, a low-pressure cyclone separation demister 5, an automatic cleaning bipolar wet electrostatic tower 6, a high-exhaust chimney 7, an equipment mounting platform 8, a demister drain valve 9 and a circulation tank 11, the low-pressure cyclone separation demister 5 and the automatic cleaning bipolar wet-type electrostatic tower 6 are arranged on an equipment mounting platform 8, the high-temperature centrifugal fan 2 is sequentially connected with a primary water spraying washing tower 3, a secondary water spraying washing tower 4, a low-pressure cyclone separation demister 5, an automatic cleaning bipolar wet-type electrostatic tower 6 and a high-exhaust chimney 7 through pipelines, a demister drain valve 9 is arranged on the low-pressure cyclone separation demister 5, and an electrostatic tower electric drain valve is arranged on the automatic cleaning bipolar wet-type electrostatic tower 6.
One-level, second grade water sprays scrubbing tower, every tower all comprises two-layer washing clean room, and every layer of washing clean room is inside all to comprise shower and filter material, and the shower water in the circulating water pond promotes through outside pump, scatters in two-layer washing clean room after the atomizer diffusion, because water smoke and wall impact splash, make waste gas by letting in wash purify in can fully contact with water smoke, the biggest dust particulate matter in the absorption waste gas, oil mist and VOC harmful component.
The low-pressure cyclone separation demister 5 and the defogging filter sheet are manufactured by processing high-density stainless steel wire meshes, the dense steel wires form a blocking net, and when moisture-containing flue gas passes through the blocking net, the moisture-containing flue gas is condensed into water drops to be dewatered and dedusted.
The automatic cleaning bipolar wet-type electrostatic tower comprises a base, a cleaning plate and a cleaning plate. The high-pressure wet electrostatic tower contains a honeycomb high-pressure adsorption electric field, and the 380V voltage is boosted to 70000V through a high-pressure transformation system, so that the high-efficiency charging, dehydration and dust removal are realized. The secondary high-voltage electrostatic motor set is internally provided with a stainless steel mesh for manufacturing and processing an electrostatic adsorption cylinder, and smoke passes through a high-voltage electrostatic area to efficiently adsorb smoke dust particles. The wet static electricity adopts an automatic spray cleaning device, adopts a water pump to circularly spray, and the circulating water returns to a circulating water tank.
The high-exhaust chimney is made of A3 steel and is used for high-altitude exhaust of smoke. The chimney is equipped with a standard exhaust gas collection detection port.
In the scheme, the equipment mounting platform is mainly used for mounting and placing the purifying equipment, the electrostatic tower automatic cleaning water return pipe effectively utilizes the mounting space, and sewage is discharged after the automatic cleaning in the automatic cleaning bipolar wet-type electrostatic tower is automatically cleaned by adopting PLC automatic control; and the cleaning circulating water tank 11 is poured by adopting concrete and is used for spraying water circulation of the primary and secondary water spraying washing towers, automatically cleaning sewage discharge of the bipolar wet electrostatic tower and collecting waste liquid purified and intercepted in each device. The flue gas purification treatment system adopts a frequency conversion fan of F64-710C, a high-efficiency mesh disk type SCGF-120 dehydration demister and a WESP-120 type 70000V bipolar wet electrostatic tower; the equipment is convenient to install, simple to use and easy to clean and maintain. The flue gas purification treatment system adopts PLC control and logic of safe and stable operation control, and can completely realize an automatic operation mode. The wet-type electrostatic tower for flue gas purification has an automatic cleaning function, so that the maintenance amount of personnel is reduced. The purification efficiency of the flue gas purification treatment system is more than or equal to 99 percent, the flue gas emission concentration is lower than 5mg/m3, and the requirement of ultra-low emission is met.
Example 2: referring to fig. 1 and 2, a method for purifying flue gas of a magnetic material drying kiln comprises the following steps:
step 1: drying kiln smoke and a main exhaust fan;
step 2: a first stage and a second stage water spraying washing stage;
and step 3: a low-pressure cyclone separation demisting section;
and 4, step 4: automatically cleaning the bipolar wet-type electrostatic section;
and 5: a high calandria chimney section.
The step 1: drying kiln flue gas, main air exhauster, specifically as follows, kiln stoving air inlet adopts circular A3 steel flange joint, adopts the middling pressure centrifugal fan of reasonable match power through high temperature centrifugal fan 2 for the waste gas source is collected.
The step 2: one, second grade water sprays the washing section, specifically as follows, one-level, second grade water sprays the scrubbing tower, every tower all comprises two-layer washing clean room, every layer of washing clean room is inside all to be become by shower and filter material, the shower water in the circulating water pond promotes through outside pump, sprinkle in two-layer washing clean room after the atomizer diffusion, because water smoke and wall impact splash, make waste gas by letting in wash purify in can fully contact with water smoke, the biggest dust particulate matter in the absorption waste gas of at utmost, oil mist and VOC harmful component.
The step 3: the low-pressure cyclone separation demisting section comprises the following specific steps: the low-pressure cyclone separation demister is a gas-liquid separation device with good separation effect. The working principle and the working process are as follows: the gas-liquid mixture with high flow speed is introduced into the cylinder body through the tangential direction of the rotational flow wheel to generate rotary motion, water drops are thrown to the cylinder wall under the action of centrifugal force and enter the outer layer liquid collecting cavity through a plurality of liquid collecting holes in the cylinder wall, so that vapor and liquid are separated preliminarily, and separated sewage flows into the liquid storage tank through the liquid guiding holes on the periphery of the cylinder bottom. The defogging filter sheet is processed and manufactured by adopting a high-density stainless steel wire mesh, the dense steel wires form a blocking net, and the smoke containing humidity is condensed into water drops after passing through the blocking net, and is dewatered and dedusted.
The step 4: the automatic cleaning bipolar wet-type electrostatic section is characterized in that a high-voltage wet-type electrostatic tower adopts high-voltage corona discharge to charge dust, and the charged dust reaches a dust collecting plate/pipe under the action of an electric field force. The wet-type static top is additionally provided with a wire mesh electric bag dust removal section of a secondary high-voltage static motor set, the wire mesh electric bag dust removal power supply control and the wet-type static power supply control are separated, the voltage is distributed in high and low, and the charged smoke removal purification efficiency is high. Install the automatic spray clearance additional in the equipment, through the mode of regularly washing, make the dust clear away along with the flow of flushing water, the system adopts the water pump circulation to spray, and the circulating water returns to the circulating water pond.
Application example 1: a flue gas purification treatment method for a magnetic material drying kiln is characterized in that a system body is made of metal and concrete, a primary water spraying and washing tower is made of concrete, and the size of the primary water spraying and washing tower is 4000 multiplied by 8000 multiplied by 10000 (mm); the air suction opening is round, the shape is phi 600(mm), and the absorption liquid is circularly sprayed; the second-level water spraying washing tower is made of concrete and has the size of 4000 multiplied by 6000(mm), and absorption liquid is sprayed circularly; the air suction opening is circular, and the shape is phi 600 (mm); the low-pressure cyclone separation demister section is made of carbon steel, and the external dimension is 2200 multiplied by 1200 multiplied by 2000 (mm); the automatic cleaning bipolar wet-type electrostatic section automatically cleans the high-pressure smoke dust, and the external dimension is 2600 multiplied by 9000 (mm). The purification efficiency can reach more than 95 percent and is superior to the national standard.
The purification treatment process comprises the following steps:
the low-pressure cyclone separation demister (5), the demisting filter (6), the high-pressure wet electrostatic tower (7) and the secondary high-pressure electrostatic generator set (8) are arranged on the equipment mounting platform. In the daily production process, a high-temperature centrifugal fan (2) is started, high-temperature drying flue gas is positively conveyed into a primary water spraying washing tower (3) and a secondary water spraying washing tower (4) through a kiln drying air inlet (1), a spraying system is started, and 8 groups of atomizing nozzles are arranged in the primary water spraying washing tower and the secondary water spraying washing tower for efficient washing; the circulating spray water flows back to the cleaning circulating water tank (11). The flue gas after being washed by water spraying enters a low-pressure cyclone separation demister (5), a defogging filter sheet (6) is used for effectively removing water contained in the flue gas and filtering grease particles; the sewage removed is discharged into a cleaning circulating water tank (11) through an automatic cleaning water return pipe (12). The dehydrated flue gas enters a high-pressure wet electrostatic tower (7), the bottom of the tower is a honeycomb electrostatic adsorption high-pressure area, and the flue gas passes through 7 ten thousand volts of high pressure and is subjected to electrostatic adsorption. The high-frequency power supply has good output volt-ampere characteristic, the electric field is not easy to flashover, and the corona power is greatly improved. And the upper part of the secondary high-voltage static motor set (8) is an electric bag dust removing area, and the secondary high-voltage static motor set is in modular design and easy to maintain. The wet electrostatic automatic spray cleaning device (9) starts automatic cleaning at regular intervals according to actual production, and cleaning sewage is discharged into the cleaning circulating water tank (11) through an electric drain valve of the electrostatic tower. And finally, the purified flue gas enters a high calandria chimney (13) to ensure that the flue gas achieves ultralow emission.
The whole system realizes automatic control, reduces maintenance personnel and improves the use efficiency.
And (3) carrying out equipment type selection and fan capability accounting:
taking the fume purification treatment of a plum steel magnet No. 2 drying kiln as an example, the fume amount of the drying kiln is 10000m3/h (standard state), the fume leaving temperature is 130 ℃, and accounting is carried out according to the requirement that the final fume dust particle emission is less than or equal to 20mg/m 3.
1) Selecting a fan: the rated air quantity is 12000m3/h, the wind pressure is 5400pa, the power is 30Kw, the rotating speed is 1900rpm, the system resistance is as the following table, the wind pressure is 5400pa which is equal to or less than 3400pa, the fan is controlled by a variable-frequency speed-regulating motor, the model of the fan is F64-710C, the requirements of the production process are met, and the specific requirements are shown in the following table 7.
TABLE 7 Smoke resistance calculation
2) A two-stage water spray washing tower, wherein the size of the first-stage water spray washing tower is 4000 multiplied by 8000 multiplied by 10000 (mm); the wind pipe is phi 600(mm), the size of the secondary water spray washing tower is 4000 multiplied by 6000(mm), each secondary water spray washing tower is provided with 8 groups of symmetrical atomizing nozzles, the primary spray washing tower adopts upper spray washing, and the primary spray washing tower adopts a process path of lateral spray washing. The circulating water quantity of the whole water system is 40 tons/hour.
3) A high-efficiency mesh-disk-shaped dehydration demister adopts a design of spirally separating fine particles by using porous channels, overcomes the influence of factors such as liquid entrainment, shearing and crushing, entrainment and the like in flue gas, ensures the separation efficiency of flue gas particle dust and water vapor, and has the model of SCGF-120 and the flue gas treatment capacity of 12000m 3/h.
4) The electrostatic tower adopts a bipolar wet electrostatic tower with a tension device, the model is selected to be WESP-120, honeycomb high-voltage electrostatic adsorption is carried out, the working voltage is 70000V, the current is 80-100mA, and the capacity of treating flue gas is 12000m 3/h; the conversion efficiency of the high-frequency power supply can reach more than 90%, the ripple of the high-frequency power supply is small (1%), the source output volt-ampere characteristic is soft, the electric field flashover voltage is high, the corona power is high, and the electric capture efficiency can be improved by 20-50%.
5) The electrostatic tower regular cleaning system is an automatic flushing system consisting of a water pump (5kw, a lift of 25m), an electromagnetic valve and a PLC, and the flushing water quantity is 25 cubic/hour.
6) Whole stoving kiln flue gas purification treatment system adopts PLC automatic control module to control:
The scheme is successfully put into trial use in flue gas treatment of a plum steel magnetic material No. 2 drying kiln, can quickly, efficiently and thoroughly purify oil stains, smoke, dust particles, harmful gases, peculiar smell and the like in high-temperature flue gas of the magnetic material drying kiln, and finally enables the tail gas of the drying kiln to reach the standard and be discharged. The emission index after implementation is compared, specifically as shown in table 4 below:
TABLE 4 data of flue gas emission after purification treatment
Meanwhile, after the flue gas purification treatment technology is adopted, the dust particle concentration is respectively detected in the flue gas flow path direction of the whole drying kiln as follows, and the following table 5 is specifically adopted:
TABLE 5 dust concentration measurement in flue gas flow direction
The flue gas and dust purification efficiency of the whole system reaches more than 99%.
(1020-2.6)/1020*100％＝99.75％
In contrast to the current national and local dust emission standards, the following table 6 is specified:
TABLE 6 flue gas dust emission comparison
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (10)
1. The utility model provides a magnetic material drying kiln flue gas purification unit, a serial communication port, processing apparatus includes high temperature centrifugal fan, one-level water sprays scrubbing tower, second grade water sprays scrubbing tower, low pressure hydrocyclone separation defroster, self-cleaning bipolar wet-type electrostatic tower, high chimney of discharging fume, equipment fixing platform, defroster drain valve and circulation pond, low pressure hydrocyclone separation defroster and self-cleaning bipolar wet-type electrostatic tower are installed on equipment fixing platform, high temperature centrifugal fan connects gradually one-level water sprays scrubbing tower, second grade water sprays scrubbing tower, low pressure hydrocyclone separation defroster, self-cleaning bipolar wet-type electrostatic tower and high chimney of discharging fume through the pipeline, be provided with the defroster drain valve on the low pressure hydrocyclone separation defroster, be provided with the electronic drain valve of electrostatic tower on the self-cleaning bipolar wet-type electrostatic tower.
2. The flue gas purification treatment device for the magnetic material drying kiln as claimed in claim 1, wherein each of the primary and secondary water spray washing towers comprises two layers of washing and purifying chambers, each layer of washing and purifying chamber comprises a spray pipe and a filter material, spray water in the circulating water tank is lifted by an external pump and is sprayed into the two layers of washing and purifying chambers after being diffused by an atomization nozzle.
3. The flue gas purification treatment device for the magnetic material drying kiln, as claimed in claim 1, wherein the low-pressure cyclone separation demister adopts a mesh disk centrifugal filtration design, water mist is thrown and removed through a high-speed rotating impeller, a defogging filter sheet is manufactured by processing a high-density stainless steel wire mesh, a dense steel wire forms a blocking mesh, and the moisture-containing flue gas is condensed into water drops when passing through the blocking mesh, and is dewatered and dedusted.
4. The flue gas purification treatment device for the magnetic material drying kiln, according to claim 3, is characterized in that the automatic cleaning bipolar wet electrostatic tower is internally provided with a honeycomb-shaped high-voltage adsorption electric field, the 380V voltage is boosted to 70000V through a high-voltage transformation system, and the high-efficiency charging, dehydration and dust removal are carried out; the second-stage high-voltage static motor set is internally provided with a stainless steel mesh for manufacturing and processing a static adsorption cylinder, smoke passes through a high-voltage static area and efficiently adsorbs smoke dust particles, wet static adopts an automatic spraying and cleaning device and a water pump for circulating spraying, and circulating water returns to a circulating water tank.
5. The device for purifying and treating the flue gas of the magnetic material drying kiln as claimed in claim 4, wherein the high-exhaust chimney is made of A3 steel and is used for high-altitude exhaust of the flue gas. The chimney is equipped with a standard exhaust gas collection detection port.
6. A flue gas purification treatment method for a magnetic material drying kiln is characterized by comprising the following steps:
step 1: drying kiln smoke and a main exhaust fan;
step 2: a first stage and a second stage water spraying washing stage;
and step 3: a low-pressure cyclone separation demisting section;
and 4, step 4: automatically cleaning the bipolar wet-type electrostatic section;
and 5: a high calandria chimney section.
7. The method for purifying the flue gas of the magnetic material drying kiln according to the claim 6, wherein the step 1: drying kiln flue gas, main air exhauster, specifically as follows, kiln stoving air inlet adopts circular A3 steel flange joint, adopts the middling pressure centrifugal fan of reasonable match power through high temperature centrifugal fan 2 for the waste gas source is collected.
8. The method for purifying the flue gas of the magnetic material drying kiln according to the claim 6, wherein the step 2: one, second grade water sprays the washing section, specifically as follows, one-level, second grade water sprays the scrubbing tower, every tower all comprises two-layer washing clean room, every layer of washing clean room is inside all to be become by shower and filter material, the shower water in the circulating water pond promotes through outside pump, sprinkle in two-layer washing clean room after the atomizer diffusion, because water smoke and wall impact splash, make waste gas by letting in wash purify in can fully contact with water smoke, the biggest dust particulate matter in the absorption waste gas of at utmost, oil mist and VOC harmful component.
9. The method for purifying the flue gas of the magnetic material drying kiln according to the claim 6, wherein the step 3: the low-pressure cyclone separation demisting section comprises the following specific steps: the gas-liquid mixture with high flow velocity is introduced into the cylinder body through the cutting direction of the cyclone wheel to generate rotary motion, water drops are thrown to the cylinder wall under the action of centrifugal force and enter the outer layer liquid collecting cavity through a plurality of liquid collecting holes in the cylinder wall, so that vapor and liquid are separated preliminarily, separated sewage flows into the liquid storage tank through the liquid guiding holes on the periphery of the cylinder bottom, the defogging filter plate is processed and manufactured by adopting a high-density stainless steel wire mesh, a blocking net is formed by dense steel wires, and moisture-containing smoke is condensed into water drops after passing through the defogging filter plate, and is dewatered and dedusted.
10. The method for purifying the flue gas of the magnetic material drying kiln according to the claim 6, wherein the step 4: the automatic cleaning bipolar wet-type electrostatic section is characterized in that a high-voltage wet-type electrostatic tower adopts high-voltage corona discharge to charge dust, the charged dust reaches a dust collecting plate/pipe under the action of an electric field force, a second-stage high-voltage electrostatic motor set wire mesh electrostatic bag dust removing section is additionally arranged at the top of wet-type electrostatic tower, a wire mesh electrostatic bag dust removing power supply control is separated from a wet-type electrostatic power supply control, the voltage is distributed in a high-low mode, the charged smoke removing and purifying efficiency is high, automatic spraying cleaning is additionally arranged in equipment, the dust is removed along with the flow of flushing water through a regular flushing mode, a water pump is adopted for circulating spraying of the system, and circulating water returns to a.
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