Waste flue gas purification device for waste steel baking

Abstract

The utility model relates to the technical field of waste steel baking, in particular to a waste flue gas purifying device for waste steel baking, which comprises a flue gas collecting component, a dust removing component, a spraying component and a flue gas discharging component which are sequentially arranged along the flue gas conveying direction, the smoke collecting assembly comprises a smoke collecting main pipe and a plurality of smoke collecting branch pipes, one end of each smoke collecting branch pipe is communicated with the smoke collecting main pipe, the other end of each smoke collecting branch pipe is provided with a smoke collecting hood, and the smoke collecting hoods are correspondingly arranged at the tops of the waste steel roamers; the dust removal assembly comprises a first dust remover and a second dust remover, an inlet of the first dust remover is communicated with one end of the smoke collection header pipe, and an outlet of the first dust remover is communicated with an inlet of the second dust remover; according to the utility model, waste flue gas is collected through the flue gas collecting assembly, large-particle impurities in the waste flue gas are removed through the dust removal assembly, deep purification is carried out through the spraying assembly, and finally the purified flue gas is discharged into the atmosphere through the flue gas discharge assembly, so that various pollutants in the waste flue gas can be effectively removed.

Description

TECHNICAL FIELD

[0001] The utility model relates to scrap steel baking technical field especially, a kind of waste flue gas purification device for scrap steel baking. BACKGROUND

[0002] Scrap steel baking refers to the heating treatment of scrap steel materials in baking equipment to remove impurities and moisture, improve the melting performance and quality of scrap steel. During the baking process, scrap steel is heated to a certain temperature, causing changes in its internal structure, thereby improving its melting characteristics and mechanical properties. Baked scrap steel can be used for the production of recycled iron and steel, reducing energy consumption and environmental pollution.

[0003] However, a large amount of waste flue gas is generated during the scrap steel baking process, which contains a large amount of dust particles and toxic and harmful substances. These substances are easily volatile at high temperatures, producing a large amount of toxic and harmful gases. Direct discharge will cause serious harm to human health and the surrounding environment. The waste flue gas purification devices in the prior art are mostly separately arranged cyclone dust collectors or bag dust collectors, which have limited purification effect and cannot effectively remove harmful substances in the flue gas. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a waste flue gas purification device for scrap steel baking that can effectively remove harmful substances in the flue gas.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A waste flue gas purification device for scrap steel baking, characterized by:

[0007] It comprises a smoke collecting assembly, a dust removal assembly, a spraying assembly and a smoke exhaust assembly arranged in sequence along the flue gas conveying direction.

[0008] The smoke collecting assembly comprises a smoke collecting main pipe and a plurality of smoke collecting branch pipes. One end of each smoke collecting branch pipe is in communication with the smoke collecting main pipe, and the other end of each smoke collecting branch pipe is provided with a smoke collecting hood. The smoke collecting hood is arranged at the top of each scrap steel baker.

[0009] The dust removal assembly comprises a first dust collector and a second dust collector. The inlet of the first dust collector is in communication with one end of the smoke collecting main pipe, and the outlet of the first dust collector is in communication with the inlet of the second dust collector. Particle discharge outlets are arranged at the bottom of the first dust collector and the second dust collector.

[0010] The spraying assembly comprises a first spraying tower and a second spraying tower. The inlet of the first spraying tower is in communication with the outlet of the second dust collector, and the outlet of the first spraying tower is in communication with the inlet of the second spraying tower. Circulating spraying mechanisms are arranged in the first spraying tower and the second spraying tower.

[0011] The smoke exhaust assembly comprises an exhaust fan and a smoke exhaust tower, the air inlet end of the exhaust fan is communicated with the outlet of the second spray tower, the air outlet end of the exhaust fan is communicated with the inlet of the smoke exhaust tower, and the outlet of the smoke exhaust tower is arranged at the top thereof.

[0012] The technical problems to be solved by the utility model can be further realized by the following steps, the first spray tower comprises a shell, the lower part of the shell is provided with a smoke inlet pipe, the inlet of the first spray tower is the pipe opening of the smoke inlet pipe, the top of the shell is provided with a smoke outlet pipe, and the outlet of the first spray tower is the pipe opening of the smoke outlet pipe.

[0013] The technical problems to be solved by the utility model can be further realized by the following steps, the circulating spray mechanism comprises a water tank, a circulating pump and a plurality of spray pipes, the water tank is arranged on one side of the shell, the circulating pump is fixedly installed in the water tank, the plurality of spray pipes are vertically arranged side by side between the smoke inlet pipe and the smoke outlet pipe, and the water outlet of the circulating pump is communicated with each spray pipe; a water outlet pipe is further arranged at the bottom of the shell, and the other end of the water outlet pipe is communicated with the inside of the water tank.

[0014] The technical problems to be solved by the utility model can be further realized by the following steps, the lower part of each spray pipe is provided with a plurality of dispersion pipes, each dispersion pipe is vertically arranged and communicated with the spray pipe, a plurality of nozzle groups are arranged axially and side by side on the dispersion pipe, and each nozzle group comprises a plurality of mist nozzles arranged in the circumferential direction of the dispersion pipe.

[0015] The technical problems to be solved by the utility model can be further realized by the following steps, the shell between the smoke inlet pipe and the water outlet pipe is fixedly provided with a impurity filter screen, the upper part of the impurity filter screen is provided with a cleaning mechanism for cleaning the screen surface of the impurity filter screen.

[0016] The technical problems to be solved by the utility model can be further realized by the following steps, the cleaning mechanism comprises a waterproof motor fixedly arranged above the middle part of the impurity filter screen, a connecting sleeve is fixedly installed at the power output end of the waterproof motor, a plurality of cleaning plates are arranged on the outer circumferential side of the connecting sleeve, and the bottom of each cleaning plate is provided with a cleaning brush in contact with the screen surface of the impurity filter screen.

[0017] The technical problems to be solved by the utility model can be further realized by the following steps, the shell on one side of the cleaning plate is provided with a impurity discharge port, a collection box is fixedly arranged outside the shell, the inlet of the collection box is arranged opposite to the impurity discharge port, and a movable drawer is arranged in the collection box below the impurity discharge port.

[0018] The technical problems to be solved by the utility model can be further realized by the following steps, the shell between the spray pipe and the smoke outlet pipe is fixedly provided with an activated carbon layer.

[0019] The technical problem to be solved by the utility model can be further realized by the following steps, and a heat exchanger is further arranged on a path in communication between the second dust remover and the first spray tower.

[0020] The technical problem to be solved by the utility model can be further realized by the following steps, and the first dust remover is specifically a cyclone dust remover, and the second dust remover is specifically a bag dust remover.

[0021] Compared with the prior art, the utility model has the beneficial effects that: waste flue gas is collected by the smoke collecting assembly, large particle impurities are removed by the dust removing assembly, deep purification is carried out by the spray assembly, and finally the purified flue gas is discharged into the atmosphere by the smoke discharging assembly, the whole purification process is efficient and continuous, and the effective removal of various pollutants in waste flue gas can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a whole structure schematic view of the utility model;

[0023] Figure 2 It is a structure schematic view of the spray tower;

[0024] Figure 3 It is an enlarged schematic view of the dispersion pipe;

[0025] Figure 4 It is a top view schematic view of the impurity filter screen and the cleaning mechanism;

[0026] In the drawing: 1 - smoke collecting main pipe; 2 - smoke collecting branch pipe; 3 - smoke collecting cover; 4 - first dust remover; 5 - second dust remover; 6 - particle discharge port; 7 - first spray tower; 8 - second spray tower; 9 - air draught fan; 10 - smoke discharging tower; 11 - shell; 12 - smoke inlet pipe; 13 - smoke outlet pipe; 14 - circulating pump; 15 - spray pipe; 16 - water outlet pipe; 17 - dispersion pipe; 18 - spray head group; 19 - mist spray head; 20 - impurity filter screen; 21 - waterproof motor; 22 - connecting sleeve; 23 - cleaning plate; 24 - cleaning brush; 25 - impurity discharge port; 26 - collection box; 27 - movable drawer; 28 - activated carbon layer; 29 - heat exchanger; 30 - waste steel roaster; 31 - rain shield; 32 - water tank. DETAILED DESCRIPTION

[0027] The specific technical scheme of the utility model is further described below, so that those skilled in the art can further understand the utility model, and it does not constitute a limitation on its rights.

[0028] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0029] Please refer to Figures 1-4 A waste gas purification device for waste steel roasting, comprising a smoke collecting assembly, a dust removal assembly, a spraying assembly and a smoke exhaust assembly arranged in sequence along the smoke conveying direction.

[0030] The smoke collecting assembly comprises a smoke collecting main pipe 1 and a plurality of smoke collecting branch pipes 2, one end of each smoke collecting branch pipe 2 is communicated with the smoke collecting main pipe 1, and the other end of each smoke collecting branch pipe 2 is provided with a smoke collecting hood 3, and the smoke collecting hood 3 is arranged at the top of each waste steel roaster 30 to collect the waste flue gas generated by each waste steel roaster.

[0031] The dust removal assembly comprises a first dust remover 4 and a second dust remover 5, the inlet of the first dust remover 4 is communicated with one end of the smoke collecting main pipe 1, the outlet of the first dust remover 4 is communicated with the inlet of the second dust remover 5, and the bottom of the first dust remover 4 and the second dust remover 5 is provided with a particle discharge port 6 to discharge the impurity particles deposited at the bottom thereof, and in the embodiment, the first dust remover 4 is a cyclone dust collector, and the second dust remover 5 is a bag dust collector.

[0032] The spraying assembly comprises a first spraying tower 7 and a second spraying tower 8, the inlet of the first spraying tower 7 is communicated with the outlet of the second dust remover 5, the outlet of the first spraying tower 7 is communicated with the inlet of the second spraying tower 8, and a circulating spraying mechanism is arranged in the first spraying tower 7 and the second spraying tower 8.

[0033] The smoke exhaust assembly comprises an exhaust fan 9 and a smoke exhaust tower 10, the air inlet end of the exhaust fan 9 is communicated with the outlet of the second spraying tower 8, the air outlet end of the exhaust fan 9 is communicated with the inlet of the smoke exhaust tower 10, and the outlet of the smoke exhaust tower 10 is arranged at the top thereof, and a rain baffle 31 is further arranged above the outlet of the smoke exhaust tower 10 to prevent rainwater from entering the inside of the smoke exhaust tower 10.

[0034] The first spraying tower 7 comprises a shell 11, one side of the lower part of the shell 11 is provided with a smoke inlet pipe 12, the inlet of the first spraying tower 7 is the pipe opening of the smoke inlet pipe 12, the top of the shell 11 is provided with a smoke outlet pipe 13, and the outlet of the first spraying tower 7 is the pipe opening of the smoke outlet pipe 13.

[0035] The circulating spraying mechanism comprises a water tank 32, a circulating pump 14 and a plurality of spraying pipes 15, the water tank is arranged on one side of the shell 11, the circulating pump 14 is fixedly installed in the water tank, the plurality of spraying pipes 15 are vertically arranged side by side between the smoke inlet pipe 12 and the smoke outlet pipe 13, each spraying pipe 15 is horizontally arranged, and the water outlet of the circulating pump 14 is communicated with each spraying pipe 15; a water outlet pipe 16 is further arranged at the bottom of the shell 11, and the other end of the water outlet pipe 16 is communicated with the inside of the water tank, so that the purified liquid deposited at the bottom of the shell 11 can be sent into the water tank to realize the circulating spraying.

[0036] In order to improve the spraying effect and reduce the dead angle of spraying, a plurality of dispersion pipes 17 are arranged below each spraying pipe 15, each dispersion pipe 17 is vertically arranged and communicated with the spraying pipe 15, a plurality of nozzle groups 18 are arranged axially and side by side on the dispersion pipe 17, and each nozzle group 18 comprises a plurality of mist nozzles 19 arranged in the circumferential direction of the dispersion pipe 17. In the embodiment, each mist nozzle 19 is arranged downwardly and obliquely, and the water inlet of the mist nozzle 19 is higher than the water outlet. The purified liquid in the water tank is sent into the spraying pipe 15 by the circulating pump 14, sprayed out through the mist nozzle 19 after entering each dispersion pipe 17, and covers the internal area of the shell 11 to the maximum extent.

[0037] In order to prevent the circulating pump 14 from being blocked, an impurity filter screen 20 is fixedly arranged in the shell 11 between the smoke inlet pipe 12 and the water outlet pipe 16, and a cleaning mechanism for cleaning the surface of the impurity filter screen 20 is arranged above the impurity filter screen 20.

[0038] The cleaning mechanism comprises a waterproof motor 21 fixedly arranged above the middle part of the impurity filter screen 20, a connecting sleeve 22 fixedly installed on the power output end of the waterproof motor 21, a plurality of cleaning plates 23 extending outwardly on the outer periphery of the connecting sleeve 22, and a cleaning brush 24 arranged on the bottom of each cleaning plate 23 and in contact with the surface of the impurity filter screen 20. The waterproof motor 21 drives the cleaning plate 23 to rotate, so that the surface of the impurity filter screen 20 can be brushed and cleaned.

[0039] A discharge port 25 is arranged on the shell 11 on one side of the cleaning plate 23, a collection box 26 is fixedly arranged outside the shell 11, the inlet of the collection box 26 is arranged opposite to the discharge port 25, and a movable drawer 27 is arranged in the collection box 26 below the discharge port 25. When the cleaning plate 23 rotates, the impurities brushed off from the surface of the impurity filter screen 20 slide into the movable drawer 27 in the collection box 26 under the centrifugal force, and the movable drawer 27 can be pulled out for cleaning after being used for a period of time.

[0040] In order to improve the purification effect, an activated carbon layer 28 is fixedly arranged in the shell 11 between the spraying pipe 15 and the smoke outlet pipe 13. Specifically, the outer periphery of the activated carbon layer 28 is provided with a mounting frame, and the mounting frame is fixedly connected with a mounting seat arranged in the inside of the shell 11 through bolts.

[0041] In order to maximize the use of flue gas heat energy, a heat exchanger 29 is further arranged in the path communicated between the second dust collector 5 and the first spray tower 7.

[0042] Working principle: in use, the waste flue gas generated by each waste steel roaster is sucked into the smoke collecting branch pipe 2 through the corresponding smoke hood 3, and is collected into the dust removal assembly through the smoke collecting main pipe 1. The dust-containing flue gas firstly passes through the first dust collector 4 (cyclone dust collector), and the coarse particle impurities are deposited to the particle discharge port 6 at the bottom under the action of centrifugal force; then the flue gas enters the second dust collector 5 (bag dust collector), and the fine dust is intercepted by the filter bag, and the cleanliness of the flue gas is significantly improved after two-stage dust removal.

[0043] The purified flue gas passes through the heat exchanger 29 for waste heat recovery and then enters the first spray tower 7. The circulating pump 14 pumps the alkaline purification liquid (such as NaOH solution) in the water tank 32 into the spray pipe 15, and forms a downward conical atomization area through the inclined mist spray head 19 on the dispersion pipe 17. The flue gas enters the lower part of the tower body from the smoke inlet pipe 12 and fully contacts with the purification liquid, effectively neutralizes the acidic gas (such as SOx, NOx) in the flue gas and captures the residual particles. The liquid droplets after spraying carry the pollutants and settle at the bottom of the tower, and are returned to the water tank through the water outlet pipe 16 for recycling, the impurity filter screen 20 intercepts the solid precipitate, and the cleaning mechanism sweeps the filter screen dirt into the collection box 26 through the rotating brush.

[0044] Then the flue gas passes through the activated carbon layer 28 to adsorb volatile organic compounds and odors, and enters the second spray tower 8 with the same structure for deep treatment, and finally is discharged at high altitude through the smoke tower 10 after being pressurized by the exhaust fan 9. The rain baffle effectively prevents rainwater from flowing back, and the unitized design of the movable drawer 27 and the collection box 26 facilitates operation and maintenance. The heat exchanger 29 extracts waste heat before the flue gas is cooled, which can be used for heating or process heat in the factory area, realizing energy cascade utilization.

[0045] Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

Claims

1. A waste flue gas purification device for scrap steel roasting, characterized in that: it comprises, in sequence along the flue gas conveying direction, a smoke collecting assembly, a dust removing assembly, a spraying assembly and a smoke discharging assembly; the smoke collecting assembly comprises a smoke collecting main pipe and a plurality of smoke collecting branch pipes, one end of each smoke collecting branch pipe is communicated with the smoke collecting main pipe, and the other end of each smoke collecting branch pipe is provided with a smoke collecting hood; the dust removing assembly comprises a first dust remover and a second dust remover, the inlet of the first dust remover is communicated with one end of the smoke collecting main pipe, the outlet of the first dust remover is communicated with the inlet of the second dust remover, and a particle discharging port is arranged at the bottom of the first dust remover and the second dust remover; the spraying assembly comprises a first spraying tower and a second spraying tower, the inlet of the first spraying tower is communicated with the outlet of the second dust remover, the outlet of the first spraying tower is communicated with the inlet of the second spraying tower, and a circulating spraying mechanism is arranged in the first spraying tower and the second spraying tower; the smoke discharging assembly comprises an air blower and a smoke discharging tower, the air inlet end of the air blower is communicated with the outlet of the second spraying tower, the air outlet end of the air blower is communicated with the inlet of the smoke discharging tower, and the outlet of the smoke discharging tower is arranged at the top thereof. The first spraying tower comprises a shell, a smoke inlet pipe is arranged on one side of the lower part of the shell, the inlet of the first spraying tower is the pipe opening of the smoke inlet pipe, a smoke outlet pipe is arranged at the top of the shell, and the outlet of the first spraying tower is the pipe opening of the smoke outlet pipe. The circulating spraying mechanism comprises a water tank, a circulating pump and a plurality of spraying pipes, the water tank is arranged on one side of the shell, the circulating pump is fixedly installed in the water tank, the plurality of spraying pipes are vertically arranged side by side between the smoke inlet pipe and the smoke outlet pipe, and the water outlet of the circulating pump is communicated with each spraying pipe; a water outlet pipe is further arranged at the bottom of the shell, and the other end of the water outlet pipe is communicated with the inside of the water tank. A plurality of dispersion pipes are arranged below each spraying pipe, each dispersion pipe is vertically arranged and communicated with the spraying pipe, a plurality of nozzle groups are arranged axially and side by side on the dispersion pipe, and each nozzle group comprises a plurality of mist nozzles arranged in a circumferential direction of the dispersion pipe. An impurity filter screen is fixedly arranged in the shell between the smoke inlet pipe and the water outlet pipe, and a cleaning mechanism for cleaning the screen surface of the impurity filter screen is arranged above the impurity filter screen. The cleaning mechanism comprises a waterproof motor fixedly arranged above the middle part of the impurity filter screen, a connecting sleeve is fixedly installed on the power output end of the waterproof motor, a plurality of cleaning plates are arranged on the outer circumferential side of the connecting sleeve, and a cleaning brush that is in contact with the screen surface of the impurity filter screen is arranged at the bottom of each cleaning plate.

2. The waste flue gas cleaning device for scrap melting according to claim 1, characterized in that: A discharge port is arranged on one side of the shell, a collecting box is fixedly arranged outside the shell, the inlet of the collecting box is arranged opposite to the discharge port, and a movable drawer is arranged in the collecting box below the discharge port.

3. The waste flue gas cleaning device for scrap melting according to claim 2, characterized in that: An activated carbon layer is fixedly arranged in the shell between the spraying pipe and the smoke outlet pipe.

4. The waste flue gas cleaning device for scrap melting according to claim 3, characterized in that: A heat exchanger is further arranged on the path between the second dust remover and the first spraying tower.

5. The waste flue gas cleaning device for scrap melting according to claim 3, characterized in that: The first dust remover is a cyclone dust remover, and the second dust remover is a bag dust remover.

6. The waste flue gas cleaning device for scrap melting according to claim 5, characterized in that: ​ 7. The scrap roasting flue gas cleaning device according to claim 6, characterized in that: ​ 8. The waste flue gas cleaning device for scrap melting according to claim 3, characterized in that: ​ 9. The scrap steel roasting flue gas cleaning device according to claim 1, characterized in that: ​ 10. The scrap roasting flue gas cleaning device according to claim 1, characterized in that: ​

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