CN213077864U - Quench tower for purifying primary flue gas dioxin and dust of electric furnace - Google Patents

Abstract

The utility model discloses a quench tower of electric stove of purifying once flue gas dioxin and dust belongs to the industrial dust removal field. Poor and the low problem of a flue gas dust pelletizing system stability of quench tower purifying effect among the prior art, the utility model provides a purify quench tower of electric stove a flue gas dioxin and dust, it includes the tower body, and the tower body is inside to be provided with a plurality of atomizer I, and the tower body bottom is provided with the ash storage storehouse, the top of tower body is provided with air inlet and exhaust core pipe, and the air inlet is tangent with the tower body top, and the exhaust core pipe inserts to the tower body from the tower body top. The utility model discloses take and admit air and insert the inside carminative mode in top that carries on of tower body in tower body top tangential and changed the air inlet and exhaust mode of quench tower among the prior art, not only make the dust collection efficiency of quench tower reach more than 95%, can make equipment volume diminish in addition, reduce area, save investment cost, entire system operation is stable and maintenance cost is low.

Description

Quench tower for purifying primary flue gas dioxin and dust of electric furnace

Technical Field

The utility model belongs to the technical field of industrial dust removal, more specifically say, relate to a quench tower of electric stove of purifying once flue gas dioxin and dust.

Background

With the rapid development of the steel industry technology in China, the electric furnace steelmaking technology taking scrap steel as a main raw material is rapidly developed. The scrap steel generally contains grease, plastics and the like, and is preheated by primary flue gas of the electric furnace in the continuous feeding process to generate a large amount of flue gas containing dioxin, and meanwhile, a part of flue gas containing dioxin and dust can be generated in the electric furnace smelting process. Dioxin is a highly toxic substance, the toxicity of the dioxin is 130 times that of cyanide and 900 times that of arsenic, and once the dioxin enters the atmosphere to cause pollution, the dioxin has great influence on the life health of people. The current 'atmospheric pollutant emission standard of steel-making industry' GB 28664-2012 in China clearly puts forward the dioxin emission standard of a newly-built electric furnace0.5ng-TEQ/Nm³The emission standard of dioxin is improved to 0.1ng-TEQ/Nm by the local standard and the European Union standard in Beijing City³. In addition, the recent ultralow emission standard of China also clearly stipulates that the emission standard of dust particles is 10mg/Nm³Along with the higher and higher requirements of the state on the environmental protection standard, the primary flue gas dioxin and dust treatment in the electric furnace steelmaking industry can be expected to be the key point.

At present, the main technology adopted for treating dioxin in primary flue gas of an electric furnace is quenching, namely, high-temperature flue gas is rapidly cooled to about 250 ℃ from 800 ℃ in a quenching tower within 3s, so that the generation of dioxin in the flue gas is reduced. However, the existing quenching tower still has the following three disadvantages in the use process. Firstly, quench tower can cause the secondary raise dust from lower part deposit room air inlet mode to in order to let a large amount of flue gases have sufficient reaction time with water smoke in quench tower, the quench tower height often need be done very high. Secondly, there is secondary pollution and can't realize automatic deashing in the deashing of quench tower lower part deposit room, and the dust that current quench tower lower part deposit room accumulated needs the operative employee to utilize fork truck to clear away, has also caused adverse effect to workman's physical and mental health when causing the secondary raise dust to the surrounding environment in the clearance process. Thirdly, the pre-purification effect of the quenching tower is poor, the flue gas discharged from the quenching tower still contains a large amount of acid gas, chlorine-containing substances and dust, if the water spraying amount of a spray gun is not well controlled in the operation process, the water content of the flue gas is often too high, the acid generated by the reaction of the acid gas and excessive water can corrode the inner wall of the quenching tower, and the service life of the quenching tower is influenced; the chlorine-containing substances are catalyzed by certain catalytic components in the fly ash at low temperature to regenerate dioxin; excessive moisture and dust adhesion can also block the flue, and the accumulated dust in the flue needs frequent clearance of workman, and more serious problem is that the flue gas that the water content is too big gets into the sack cleaner and can cause the stick with paste the bag, leads to the failure of electric stove once flue gas dust removal to lead to whole electric stove to smelt the production interrupt.

Corresponding improvement is also carried out aiming at the problems, for example, Chinese patent application No. CN201910800790.4, the publication date is 11, 12 and 2019, the patent discloses a high-efficiency energy-saving environment-friendly quenching tower, and belongs to the technical field of flue gas treatment. The utility model discloses a quench tower body, quench tower body constitute by spraying section, waste heat recovery section and high temperature flue gas inlet section, the low temperature gas outlet has been seted up on the top of quench tower body, the dirt mud discharge port has been seted up to the bottom of quench tower body, the inside interval of spraying section be provided with the shower head, the outer wall of waste heat recovery section laid the waste heat recovery pipeline, the surface intercommunication of high temperature flue gas inlet section has venturi mouth, venturi mouth's mouth of pipe department is provided with the flue gas and handles the pipe. The disadvantages of the patent are that: the flue gas inlet flow velocity of the Venturi tube opening is high, the inner wall of the quenching tower is directly washed by dust-containing high-temperature flue gas, the inner wall of the quenching tower opposite to the air inlet is easily seriously abraded, and the air inlet at the lower part can enable dust removing plaster at the bottom end to generate secondary dust; although the content of dioxin can be effectively removed, the pre-dedusting and dust and mud discharging effects of the quenching tower are poor, and the service life of the quenching tower is influenced by the accumulation of the dust and mud at the bottom of the tower.

Also as disclosed in chinese patent application No. CN201320110801.4, published 2013, 7, 31, which includes a quench tower apparatus. It includes a set of quench tower, quench section water jacket and stand pipe. Quench tower divide into quench zone and reaction section, and the quench zone adopts water jacket structure, and atomizer sets up in flue gas import department, is provided with the stand pipe in the middle of the quench tower, makes spiral downstream in the quench tower, and quench tower adopts carbon steel inside lining anticorrosive paint. The defects of the patent are as follows: the pre-purification effect of the quenching tower is poor, and the service life of the quenching tower is influenced by the accumulation of the quenching tower at the bottom of the tower.

SUMMERY OF THE UTILITY MODEL

1. Problems to be solved

Poor and the low problem of flue gas dust pelletizing system stability of quench tower purifying effect among the prior art, the utility model provides a quench tower of flue gas dioxin and dust once of electric stove purifies. The utility model discloses take and admit air and insert the inside carminative mode in top that carries on of tower body in tower body top tangential and changed the air inlet and exhaust mode of quench tower among the prior art, not only make the dust collection efficiency of quench tower reach more than 95%, can make equipment volume diminish in addition, reduce area, save investment cost, and whole dust pelletizing system operation is stable the maintenance cost low.

2. Technical scheme

In order to solve the above problems, the utility model adopts the following technical proposal.

The utility model provides a purify quench tower of flue gas dioxin and dust of electric stove, includes the tower body, and the tower body is inside to be provided with a plurality of atomizer I, and the tower body bottom is provided with stores up the ash bin, the top of tower body is provided with air inlet and exhaust core pipe, and the air inlet is tangent with the tower body top, and the exhaust core pipe inserts to the tower body in from the tower body top. The air inlet and exhaust mode of the quench tower in the prior art is changed, the dust removal efficiency of the quench tower is up to more than 95%, the equipment volume is reduced, the occupied area is reduced, and the investment cost is saved.

Furthermore, a spraying device II is arranged right below the exhaust core pipe, and a plurality of spraying devices I are annularly distributed in the tower body. Increase the area of contact between dusty flue gas and two atomizer, reduce the generation of dioxin, improve the efficiency that quench tower purified dioxin and removed dust in advance.

Furthermore, the tower body comprises a cylinder connected with the air inlet, the cylinder is connected with an inverted cone, and the inverted cone is connected with the ash storage bin. The tower body has simple structure, is convenient for the dust-containing smoke body to do rotary motion in the tower body and is convenient for the separation of dust and smoke.

Furthermore, the bottom of the ash storage bin is in an inverted cone shape, and a bin wall vibrator and a height level indicator are arranged at the bottom of the inverted cone shape. The dust quantity in the dust storage bin is monitored and early-warned, and the dust quantity in the dust storage bin is prevented from being accumulated to influence the purifying effect of the quench tower.

Furthermore, the included angle beta between the bottom of the ash storage bin and the horizontal plane has the value range as follows: beta is more than or equal to 55 degrees and less than or equal to 75 degrees. The dust accumulation on the inner wall of the dust storage bin is avoided.

Furthermore, a manual gate valve, a star-shaped ash discharging valve, an ash discharging pipe and an ash sucking and discharging device are sequentially connected below the ash storage bin. The dust in the dust storage bin is transferred in time.

Furthermore, the ash suction and discharge device comprises a screw feeder, an air-ash mixed flow device and a suction pipe joint, the screw feeder is connected with the bottom of the ash discharge pipe, one end of the air-ash mixed flow device is connected with the feeding side of the screw feeder, and the other end of the air-ash mixed flow device is connected with the suction pipe joint. The unloading is uniform, so that the dust can smoothly enter the suction-exhaust type tank car to finish the transportation.

Further, the spraying device I is a two-fluid spray gun consisting of compressed air and an alkaline solution, and the spraying device II is a two-fluid spray gun consisting of ammonia and water. The generation of dioxin is reduced, and the purification effect of the quenching tower is improved.

Further, the spraying means I is provided at a middle position of the cylinder.

Furthermore, temperature sensors are arranged at the outlets of the air inlet and the exhaust core pipe. Corresponding adjustment can be made conveniently and timely according to the temperature, so that the quenching tower can operate efficiently and stably.

3. Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model discloses be tangent setting with air inlet and tower body top for the dirty flue gas that gets into the tower body inside from the air inlet forms a rotatory flow in the tower body inside, and the dust in the flue gas can be under the effect of centrifugal force along the air current direction downstream, and the dust takes place to separate with the flue gas when moving to the tower body bottom, and the dust falls into to the ash storage storehouse because self gravity, adopts this kind of tangential air inlet mode simultaneously can avoid the dirty flue gas of air inlet department directly to erode the tower body inner wall, can prolong quench tower's life; the short circuit of the dust-containing smoke can be greatly reduced by exhausting through the exhaust core pipe inserted into the tower body, and the dust removal efficiency of the quenching tower reaches more than 95%;

(2) the utility model discloses be annular with a plurality of atomizer I and distribute inside the tower body, atomizer II sets up under the core pipe of exhausting, and the dusty air current is rotary motion in the tower body, has increased flue gas and two atomizer spun solution reaction time, has avoided the synthesis of dioxin to the at utmost, improves the efficiency that quench tower purified dioxin and dust removal in advance;

(3) the tower body in the utility model comprises an upper part and a lower part, wherein the upper part is a cylinder which is connected with an air inlet, the inner space of the cylinder is annular, the space is large, and the dust-containing smoke body can conveniently rotate on the inner wall of the cylinder; the lower part is an inverted cone which is connected with the ash storage bin, and the inverted cone is arranged to facilitate the separation of the dust-containing smoke body at the lower part of the tower body, so that dust can smoothly enter the ash storage bin; the included angle alpha between the inverted cone and the ash storage bin is 45-75 degrees, so that dust falls into the ash storage bin at the lower part from the inverted cone, the dust is reduced to the maximum extent and returns to the inside of the cylinder, and the dust removal efficiency of the quench tower is improved;

(4) the bottom of the ash storage bin is inverted cone-shaped, which is beneficial to the transfer of dust in the ash storage bin; when the dust amount in the dust storage bin reaches the highest position limit, the high and low level indicator gives an alarm and then the bin wall vibrator works, so that dust accumulated at the bottom of the dust storage bin quickly falls and is transferred and is transported away from the dust storage bin;

(5) the utility model discloses connect gradually manual push-pull valve, star type unloading valve, dust discharge pipe and inhale the row ash device in the below of ash storage storehouse, when the dust in the ash storage storehouse need be shifted, the dust loops through manual push-pull valve, star type unloading valve and dust discharge pipe and shifts to inhaling row ash device, carries out the negative pressure by inhaling row formula tank car and inhales row ash device again and draws the dust, and the whole process is gone on under airtight environment, and it is excessive not to have the dust ash that removes dust; the dust collection, storage and automatic ash discharge are realized, the production automation is realized without blowing out, the pollution to the surrounding environment is avoided, and the risk of occupational diseases of workers is avoided;

(6) the spiral feeder in the ash suction and discharge device has the functions of metering and feeding, solves the defect of uneven ash discharge of the star-shaped ash discharge valve, ensures that the whole ash suction and discharge device can discharge evenly, is connected with the suction-discharge type tank car by the suction pipe to suck out dust, prevents material blockage, and also has the advantages of simple structure, reasonable design and easy manufacture;

(7) the utility model discloses well atomizer I is the double-fluid spray gun that compressed air and alkaline solution constitute, and other acid gas in the flue gas can be neutralized to alkaline solution, has avoided acid gas to the corruption of quench tower equipment and flue, has prolonged the life of equipment, and atomizer I sets up the intermediate position at the drum, and furthest avoids the synthesis of dioxin; the spraying device II is a double-fluid spray gun consisting of ammonia and water, so that on one hand, water resources are saved, and the condition that excessive water and dust in flue gas are bonded to block a flue and cause bag pasting is avoided; on the other hand, when the temperature of the flue gas exceeds 250 ℃, ammonia is sprayed into the flue gas, so that the generation of dioxin in the flue gas can be effectively inhibited, and the capability of a quenching tower for purifying the dioxin is improved;

(8) the utility model is provided with temperature sensors at the outlets of the air inlet and the exhaust core pipe, when the temperature at the air inlet exceeds 800 ℃, the spraying capacity of the spraying device I which is arranged in an annular shape is increased, and the flue gas temperature can be rapidly cooled to about 250 ℃ in the specified time; when the temperature of the outlet flue gas exceeds 250 ℃, the spraying device II below the exhaust core pipe is opened and used for fine adjustment, so that the synthesis of dioxin in the flue gas is avoided, the temperature of the flue gas is stabilized within a set value range, and the efficient and stable operation of the whole quenching tower is ensured.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a view taken along line A-A of FIG. 1;

FIG. 3 is a view taken along line B-B of FIG. 1;

fig. 4 is an enlarged view of a portion C in fig. 1.

In the figure: 1. an air inlet; 2. a cylinder; 3. a spraying device I; 4. an inverted cone; 5. an ash storage bin; 6. a bin wall vibrator; 7. a manual gate valve; 8. a star-shaped ash discharge valve; 9. a dust sucking and discharging device; 10. an exhaust core tube; 11. a spraying device II; 12. a temperature sensor; 13. a high-low level indicator.

Detailed Description

The invention will be further described with reference to specific embodiments and drawings.

Most of the existing quench towers adopt a mode of air inlet from a bottom settling chamber, exhaust adopts a direct exhaust mode connected with the top of a tower body, secondary dust raising can be formed when air is introduced from the bottom of the settling chamber, and an exhaust pipe is directly connected with the top of the tower body to increase the dust concentration of flue gas at the outlet of the quench tower, so that the filtration load of a subsequent bag-type dust remover is increased, and filter bags need to be frequently replaced, thereby increasing the operation cost; in addition, in order to ensure that a large amount of flue gas has sufficient reaction time with water mist in the quenching tower, the height of the quenching tower is often very high, and the occupied area is large; and the flue gas from the quenching tower still contains a large amount of acid gas, chlorine-containing substances and dust, and the chlorine-containing substances are catalyzed by certain catalytic components in the fly ash at low temperature to regenerate dioxin, so that serious pollution damage is caused. The inventor provides a quench tower for purifying primary flue gas dioxin and dust of an electric furnace through multiple on-site reconnaissance and repeated tests, can solve the problem of the existing quench tower during operation, and has wide application prospect.

Example 1

The utility model provides a purify quench tower of flue gas dioxin and dust of electric stove, includes the tower body, and the tower body is inside to be provided with a plurality of atomizer I3, and the tower body bottom is provided with ash storage bin 5, the top of tower body is provided with air inlet 1 and exhaust core pipe 10, and air inlet 1 is tangent with the tower body top, and exhaust core pipe 10 inserts to the tower body in from the tower body top. In the implementation, the air inlet 1 and the top of the tower body are arranged in a tangent manner, so that dust-containing flue gas entering the tower body from the air inlet 1 forms a rotating flow in the tower body, dust in the flue gas can move downwards along the air flow direction under the action of centrifugal force, the dust is separated from the flue gas when the flue gas moves to the bottom of the tower body, the dust falls into the dust storage bin 5 due to the self gravity, and meanwhile, the tangential air inlet mode can prevent the dust-containing flue gas at the air inlet 1 from directly scouring the inner wall of the tower body, so that the service life of the quench tower can be prolonged; the exhaust core tube 10 inserted into the tower body is used for exhausting, so that the short circuit of the dust-containing smoke can be greatly reduced, and the short circuit is that the dust-containing smoke is discharged from the exhaust core tube just after entering the tower body and is not treated; the dust-containing flue gas rises from the bottom of the tower body after the cyclone effect and is discharged through the exhaust core pipe 10; furthermore, a spraying device II11 is arranged right below the exhaust core tube 10, a plurality of spraying devices I3 are annularly distributed in the tower body, a plurality of spraying devices I3 are annularly distributed in the tower body to increase the contact area with the dust-containing flue gas, and a spraying device II11 is arranged right below the exhaust core tube 10; the dust-containing flue gas rotates in the tower body, so that the reaction time of the flue gas and the atomized solution sprayed by the two spraying devices is prolonged, the generation of dioxin is reduced, and the efficiency of purifying the dioxin and pre-dedusting by the quenching tower is improved; and simultaneously, the height of the quenching tower can be reduced, and the construction cost is reduced.

The utility model discloses take and admit air and insert the inside top exhaust mode that carries on of tower body in tower body top tangential and changed the air inlet and exhaust mode of quench tower among the prior art, not only make the dust collection efficiency of quench tower reach more than 95% to the formation of dioxin in the furthest reduction flue gas reduces the pollution to the environment and to personnel's physical and mental harm, can make equipment volume diminish moreover, reduces area, saves investment cost, has higher popularization meaning.

Example 2

Essentially the same as in example 1, except that as shown in fig. 1, 2, 3 and 4, the tower body comprises a cylinder 2 connected to an inlet 1, the cylinder 2 having a diameter D and a height H, the inlet 1 having a diameter D₁The inner space of the cylinder 2 is annular, the space is large, and the dust-containing smoke body can conveniently rotate on the inner wall of the cylinder 2; specifically, the exhaust core tube 10 is a circular tube with a diameter D₂The length of the exhaust core tube 10 inserted into the cylinder 2 is H₁，H₁The ranges of (A) are: h is not more than 0.1H₁Not more than 0.5H, and in the range, the exhaust efficiency of the exhaust core pipe 10 is higher, the separation of the smoke and the dust is not influenced, and the content of the dust in the exhaust gas is reduced; the cylinder 2 is connected with the inverted cone 4, the inverted cone 4 is connected with the ash storage bin 5, and the inverted cone 4 is arranged to facilitate the separation of the dust-containing smoke body at the lower part of the tower body, so that dust can smoothly enter the ash storage bin 5; preferably, the range of the included angle α between the inverted cone 4 and the ash storage bin 5 is as follows: alpha is more than or equal to 45 degrees and less than or equal to 75 degrees. The included angle alpha in the range is favorable for dust falling from the inverted cone 4In the ash storage bin 5, dust is reduced to the maximum extent and returns to the interior of the cylinder 2, and the dust removal efficiency of the quenching tower is improved; the too big contained angle of both can make the quench tower volume too big, and the too little contained angle of both is unfavorable for the dust to fall into in the ash storage 5.

Furthermore, the bottom of the ash storage bin 5 is in an inverted cone shape, and a bin wall vibrator 6 and a height level indicator 13 are arranged at the bottom of the inverted cone shape; the bottom of the ash storage bin 5 is in an inverted cone shape, so that the falling and transfer of dust in the ash storage bin 5 are facilitated, and the dust blockage is avoided; the high-low material level indicator 13 has a monitoring and early warning effect on the dust amount in the dust storage bin 5, when the dust amount in the dust storage bin 5 reaches the highest position limit, the high-low material level indicator 13 gives an alarm and then the bin wall vibrator 6 works, so that dust accumulated at the bottom of the dust storage bin 5 quickly falls and is transferred, the dust is conveyed away from the dust storage bin 5, and the influence of excessive dust amount in the dust storage bin 5 on the purification effect of the quench tower is avoided; specifically, the value range of the included angle β between the bottom of the ash storage bin 5 and the horizontal plane in this embodiment is as follows: beta is more than or equal to 55 degrees and less than or equal to 75 degrees; the included angle beta is mainly used for preventing dust from accumulating on the side wall of the ash storage bin 5 in the range, so that smooth ash discharge of the ash storage bin 5 is facilitated, and the ash discharge efficiency of the quench tower is improved; the too large included angle between the two can make the ash storage bin 5 equipment volume too big, and the contained angle undersize is unfavorable for the dust removal ash to be discharged.

Example 3

Basically as the embodiment 2, in this embodiment, a manual gate valve 7, a star-shaped ash discharge valve 8, an ash discharge pipe and an ash suction and discharge device 9 are sequentially connected below the ash storage bin 5; when the dust in the dust storage bin 5 reaches a high material level, the high-low material level indicator 13 gives an alarm, the dust discharging operation needs to be started, the dust in the dust storage bin 5 enters the dust suction and discharge device 9 through the manual gate valve 7, the star-shaped dust discharge valve 8 and the dust discharge pipe under the action of the bin wall vibrator 6, the dust suction and discharge device 9 is in butt joint with the suction-discharge type tank car, the dust in the dust suction and discharge device 9 is sucked into the tank car under the negative pressure action of the suction-discharge type tank car, the whole process is carried out in a closed environment, no dust is removed, no dust overflows, and automatic dust discharging and no secondary pollution are really realized; the embodiment changes the ash removal mode that the manual ash removal can be carried out only during the furnace shutdown in the settling chamber at the lower part of the quenching tower in the prior art, and slows down the secondary dust generated in the ash removal processThe dust separated from the quenching tower is stored in the dust storage bin 5, and is periodically transported away by a suction-type tank truck when the stored dust reaches a high material level; the ash removal mode realizes the collection, storage and automatic ash discharge of dust, realizes the production automation without blowing out, avoids the pollution to the surrounding environment and avoids the risk of occupational diseases of workers; the height of the ash suction and discharge device 9 from the ground is H₂The value range is as follows: h is more than or equal to 500mm₂Not more than 1200mm, this height interval is favorable to the row's of inhaling formula tank car to take over the row of ash to do benefit to the maintenance of later stage row of inhaling ash device 9, highly too big low all be unfavorable for the row of ash device 9 of inhaling of taking over ash and maintenance.

Specifically, in this embodiment, the dust suction and discharge device 9 includes a screw feeder, an air-ash mixing device and a suction pipe joint, the screw feeder is connected to the bottom of the dust discharge pipe, one end of the air-ash mixing device is connected to the feeding side of the screw feeder, the other end of the air-ash mixing device is connected to the suction pipe joint, and the dust suction and discharge device 9 is butted with the suction-discharge tank car through the suction pipe joint to realize dust transfer transportation; the screw feeder has the functions of metering and feeding, solves the defect of uneven ash discharge of the star-shaped ash discharge valve 8 and ensures that the whole ash suction and discharge device 9 can discharge materials uniformly; and the gas-ash flow mixing device is a cylindrical tube, has a simple structure and a large internal space, and can effectively discharge dust.

Example 4

Substantially as in example 3, specifically, spray apparatus I3 was a two-fluid spray gun composed of compressed air and an alkaline solution, and spray apparatus II11 was a two-fluid spray gun composed of ammonia and water; since several spraying devices I3 are arranged annularly on the inner wall of the cylinder 2, i.e. several spraying devices I3 are arranged on the same circle with a diameter D₃The diameter of the circle is equal to the diameter D of the cylinder 2 and the diameter D of the exhaust core tube 10₂In particular, D in the present embodiment₃＝0.5(D+D₂) The arrangement enables the spraying device I3 to be in full contact with the dust-containing smoke, so that the generation of dioxin is reduced; the spraying device I3 is compressed airThe two-fluid spray gun is composed of alkaline solution, the spraying device I3 is annularly arranged, so that the flue gas can be rapidly quenched from 800 ℃ to 250 ℃, the effective chlorine source of the flue gas in the temperature range can be reduced, the synthesis of dioxin in the flue gas is avoided, and meanwhile, the alkaline atomization solution can neutralize acid gas and can pretreat fine particles; the spraying device II11 is a two-fluid spray gun consisting of ammonia and water, the water mist sprayed by the spray gun is fine, the fine water mist is used for finely adjusting the outlet temperature of the quenching tower, and the ammonia can effectively inhibit the secondary synthesis of dioxin at about 250 ℃.

The spraying mode of the existing quenching tower is changed, furthermore, the spraying device I3 is arranged in the middle of the cylinder 2, if the spraying device I3 is arranged too high in the cylinder 2, the flue gas cannot react with the atomized solution in the spraying device I3 sufficiently, the flue gas cannot obtain the quenching effect, and the generation of dioxin cannot be prevented; the position is arranged in the cylinder 2 too low, dust-containing smoke gas is discharged from the exhaust core pipe 10 without being fully cooled, on one hand, the high-temperature smoke gas can burn out a cloth bag of a subsequent cloth bag dust remover, and on the other hand, dioxin is easy to exceed the standard and be discharged; because the temperature of the flue gas entering the cylinder 2 is about 600-800 ℃, when the flue gas flows in a downward rotating manner from the upper part and meets the alkaline atomized solution sprayed by the spraying device I3, on one hand, the temperature of the flue gas can be rapidly reduced to about 250 ℃ when the alkaline solution is gasified, and meanwhile, the alkaline atomized solution can effectively reduce chlorine sources in the temperature range, thereby avoiding the synthesis of dioxin to the maximum extent; on the other hand, the alkaline solution can also neutralize other acid gases in the flue gas, thereby avoiding the corrosion of the acid gases to the quenching tower equipment and the flue and prolonging the service life of the equipment; in addition, ammonia water and water sprayed by a spraying device II11 right below the exhaust core tube 10 are mainly used for inhibiting generation of dioxin and adjusting the temperature of flue gas, when the temperature of the exhaust core tube 10 exceeds 250 ℃, in order to prevent burning-out of filter bags of a bag-type dust collector in a subsequent process due to overhigh flue gas, a spraying device II11 is used for supplementing some fine water mist and ammonia gas, the adjusting mode is different from the water amount caused by integrally adjusting the water mist of a spray gun in the prior art, and on one hand, water resources are saved, and the situations that excessive water and dust in the flue gas are bonded to block a flue and cause bag pasting are avoided; on the other hand, when the temperature of the flue gas exceeds 250 ℃, ammonia is sprayed in, so that the generation of dioxin in the flue gas can be effectively inhibited, and the capability of the quenching tower for purifying the dioxin is improved. Other spray devices I3 and II11 capable of spraying atomized solution can be used in the present invention.

Example 5

Basically as in embodiment 4, preferably, the temperature sensors 12 are disposed at the outlets of the air inlet 1 and the exhaust core tube 10, and when the temperature at the air inlet 1 exceeds 800 ℃, the spraying capacity of the spraying device I3 arranged in a ring shape is increased, so as to ensure that the temperature of the flue gas can be quenched to about 250 ℃ within a specified time; when the temperature of the outlet flue gas exceeds 250 ℃, the spraying device II11 below the exhaust core pipe 10 is started, the spraying device II11 is used for fine adjustment, synthesis of dioxin is avoided in the flue gas, and the temperature of the flue gas is stabilized within a set value range, so that efficient and stable operation of the whole quenching tower is guaranteed.

The examples of the utility model are only right the utility model discloses a preferred embodiment describes, and not right the utility model discloses design and scope are injectd, do not deviate from the utility model discloses under the prerequisite of design idea, the field engineering technical personnel are right the utility model discloses a various deformation and improvement that technical scheme made all should fall into the protection scope of the utility model.

Claims (10)

1. The utility model provides a purify quench tower of electric stove primary flue gas dioxin and dust, includes the tower body, and the tower body is inside to be provided with a plurality of atomizer I (3), and the tower body bottom is provided with ash storage bin (5), its characterized in that: the top of tower body is provided with air inlet (1) and exhaust core pipe (10), and air inlet (1) is tangent with the tower body top, and during tower body top was inserted to the tower body was followed in exhaust core pipe (10), be provided with atomizer II (11) under exhaust core pipe (10).

2. The quenching tower for purifying the primary flue gas dioxin and dust of the electric furnace according to claim 1, characterized in that: a plurality of spraying devices I (3) are annularly distributed in the tower body.

3. The quenching tower for purifying the primary flue gas dioxin and dust of the electric furnace according to claim 2, characterized in that: the tower body comprises a cylinder (2) connected with an air inlet (1), the cylinder (2) is connected with an inverted cone (4), and the inverted cone (4) is connected with an ash storage bin (5).

4. The quenching tower for purifying the primary flue gas dioxin and dust of electric furnaces as claimed in claim 1 or 3, wherein: the bottom of ash storage bin (5) is the back taper, and is provided with bulkhead vibrator (6) and height charge level indicator (13) in the bottom of back taper.

5. The quenching tower for purifying the primary flue gas dioxin and dust of the electric furnace according to claim 4, characterized in that: the included angle beta between the bottom of the ash storage bin (5) and the horizontal plane has the value range: beta is more than or equal to 55 degrees and less than or equal to 75 degrees.

6. The quenching tower for purifying the primary flue gas dioxin and dust of the electric furnace according to claim 5, characterized in that: the lower part of the ash storage bin (5) is sequentially connected with a manual gate valve (7), a star-shaped ash discharge valve (8), an ash discharge pipe and an ash suction and discharge device (9).

7. The quenching tower for purifying the primary flue gas dioxin and dust of the electric furnace according to claim 6, characterized in that: the ash suction and discharge device (9) comprises a screw feeder, an air-ash mixed flow device and a suction pipe joint, the screw feeder is connected with the bottom of the ash discharge pipe, one end of the air-ash mixed flow device is connected with one feeding side of the screw feeder, and the other end of the air-ash mixed flow device is connected with the suction pipe joint.

8. The quenching tower for purifying the primary flue gas dioxin and dust of the electric furnace according to claim 3, characterized in that: the spraying device I (3) is a two-fluid spray gun consisting of compressed air and alkaline solution, and the spraying device II (11) is a two-fluid spray gun consisting of ammonia and water.

9. The quenching tower for purifying the primary flue gas dioxin and dust of the electric furnace according to claim 8, characterized in that: the spraying device I (3) is arranged in the middle of the cylinder (2).

10. The quenching tower for purifying the primary flue gas dioxin and dust of the electric furnace according to claim 1, characterized in that: and temperature sensors (12) are arranged at the outlets of the air inlet (1) and the exhaust core pipe (10).

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