CN116334332A - Gas dust removing device, damping down dust removing system, process and gas full recovery process - Google Patents

Abstract

The utility model relates to a coal gas dust collector, damping down dust pelletizing system, technology and coal gas full recovery technology, it includes dust removal tank, filter bag, ejector and dust discharging tank, the filter bag sets up in the dust removal tank, the ejector sets up along the axial of dust removal tank, and the first end of ejector is located the dust removal tank outside, the second end of ejector passes the bottom of filter bag and is located the dust removal tank, the first end of ejector is provided with coal gas entry and injection air source entry, the coal gas entry is linked together with the gas pipeline, wait to remove dust coal gas can pour into the dust removal tank through gas pipeline and coal gas entry; the injection air source inlet is connected with an air source pipe, and an air source pipe on-off valve is arranged on the air source pipe; the dust removal tank is characterized in that an exhaust pipe is connected to the side wall of the dust removal tank and above the filter bag, the gas to be removed is discharged through the exhaust pipe after being removed by the filter bag, and the ash discharge tank is communicated with the bottom of the dust removal tank to collect dust falling from the filter bag. The dust removal device has the effect of reducing the occupied area of the dust removal device as much as possible, thereby reducing the consumption of land resources.

Description

Gas dust removing device, damping down dust removing system, process and gas full recovery process

Technical Field

The application relates to the technical field of blast furnace ironmaking, in particular to a gas dust removing device, a damping down dust removing system, a process and a gas full recovery process.

Background

A byproduct called blast furnace gas is generated in the blast furnace damping down process, and the blast furnace gas contains combustible gas components such as carbon monoxide and the like which can be utilized, so that the gas generated in the blast furnace damping down process is recycled, the environment is protected, and the purpose of saving resources is achieved.

The existing damping down gas dust removal technology mainly comprises the steps of sequentially arranging equipment such as a dust remover, an ejector, an exhaust pipe, a gas pipe network and the like on a blast furnace gas pipeline, and filtering, discharging and recycling blast furnace gas by utilizing the equipment, wherein the required equipment is relatively more, so that the engineering amount of the whole installation engineering is huge, the occupied area of the equipment is large, the consumed land resources are relatively more, and the produced noise has larger pollution to the environment.

The existing gas full recovery process mainly comprises the steps of sequentially arranging equipment such as an ejector, a dust remover, an exhaust pipe, a gas pipe network and the like on a gas recovery pipeline of a charging bucket, wherein the equipment occupies a large area and has high noise.

Aiming at the related technology, the defects of large occupied area of dust removing equipment and relatively more consumed land resources exist.

Disclosure of Invention

In order to reduce the occupied area of dust removing equipment as much as possible, so that the consumption of land resources is reduced, and meanwhile, the pollution of noise to the environment is reduced, the application provides a blast furnace dust removing system and a blast furnace dust removing process.

The blast furnace dust removal system and the process provided by the application adopt the following technical scheme:

a gas dust removal device comprising: the dust removing device comprises a dust removing tank, a filter bag, an ejector and an ash discharging tank, wherein the filter bag is arranged in the dust removing tank, the ejector is arranged along the axial direction of the dust removing tank, a first end of the ejector is positioned outside the dust removing tank, a second end of the ejector penetrates through the bottom of the filter bag and is positioned in the dust removing tank, a gas inlet and an ejection gas source inlet are formed in the first end of the ejector, the gas inlet is communicated with a gas pipeline, and a gas on-off valve and a gas pipeline main valve are arranged on the gas pipeline; the injection air source inlet is connected with an air source pipe, and an air source pipe on-off valve is arranged on the air source pipe; the dust removal device is characterized in that an exhaust pipe is connected to the side wall of the dust removal tank and above the filter bag, gas to be removed is discharged through the exhaust pipe after being subjected to dust removal by the filter bag, and the dust discharge tank is communicated with the bottom of the dust removal tank to collect dust falling from the filter bag.

By adopting the technical scheme, the ejector, the ash discharging tank and the filter bag are all arranged on the dust removing tank, and the ejector is used as an air inlet pipeline of coal gas during normal production of the blast furnace; when the blast furnace is in a damping down state, the ejector can introduce a high-pressure air source into the dust removal tank, the damping down coal gas of the blast furnace is recovered into the coal gas dust removal device, and after filtration and purification, the coal gas is conveyed to a low-pressure pipe network, so that the purification and recovery of the damping down coal gas of the blast furnace are realized, and the coal gas dust removal device provided by the application can work in a normal production state and a damping down state; in addition, on the whole, the whole device replaces the original blast furnace damping down coal gas treatment facility, the occupied area is small, the waste of land resources is reduced, and meanwhile, the pollution of noise to the environment is reduced.

Preferably, the extending direction of the air source pipe is perpendicular to the axial extending direction of the ejector.

Through adopting above-mentioned technical scheme, when opening the air supply pipe break-make valve, the gas in the air supply pipe is spouted to the ejector inner wall from penetrating the air supply entry, then along ejector axial extending direction entering dust removal jar in, consequently the air current velocity in the ejector is slower relatively, and the noise that its produced is less relatively to operational environment's travelling comfort has been improved.

Preferably, the extending direction of the air source pipe is the same as the axial extending direction of the ejector.

Through adopting above-mentioned technical scheme, when opening the air supply pipe break-make valve, the gas in the air supply pipe is directly sprayed to the dust removal jar along the ejector axial extending direction from the air supply entry that draws, and consequently the air current velocity in the ejector is relatively fast to gas dust removal device's dust removal efficiency and dust removal effect have been improved.

Preferably, the upper end of the dust removal tank is positioned at the necking position of the ejector.

Through adopting above-mentioned technical scheme, when the ejector is in operating condition, because the latus rectum of the throat department of ejector is less relatively, consequently can produce the noise when high velocity of flow gas passes through the throat department, and the upper end of dust removal jar is located the throat department of ejector, consequently the dust removal jar wraps the throat department of ejector to the propagation scope of noise has been reduced, operational environment's travelling comfort has been improved.

Preferably, the bottom side of the dust removal tank is communicated with a bypass air inlet pipe, an air inlet of the bypass air inlet pipe is communicated with a gas pipeline, an air outlet of the bypass air inlet pipe is positioned below the filter bag, and an air inlet on-off valve is arranged on the bypass air inlet pipe.

By adopting the technical scheme, when the pressure in the blast furnace is high, the air inlet on-off valve on the bypass air inlet pipe is opened, so that the air quantity entering the dust removal tank is increased, and the ventilation efficiency is improved; in addition, the ejector channel can be closed to reduce the dust amount of the ejector pipeline, thereby avoiding the occurrence of the condition of blocking the air source pipeline as much as possible.

Preferably, the side wall of the dust removal tank is connected with a pulse back-blowing device, a blowing pipe is connected between the pulse back-blowing device and the dust removal tank, and an inlet of the blowing pipe is positioned above the filter bag.

Through adopting above-mentioned technical scheme, when depositing too much dust on the filter bag, can lead to coal gas dust collector's dust removal effect to reduce, consequently can blow down the dust of depositing on the filter bag through pulse blowback device in unloading the ash pipe to resume the dust removal effect of filter bag.

Preferably, a plurality of brackets are filled between the ejector and the inner wall of the dust removal tank, the brackets are arranged in a crossing way, and the filter bag is wrapped on the brackets; and

one end of the support is opposite to the inlet of the air blowing pipe, and a wave increasing funnel is arranged at one end of the support close to the air blowing pipe and at the middle part in the support.

By adopting the technical scheme, the brackets are mutually crossed, so that noise at the necking part of the ejector is not easy to pass through the area between the ejector and the dust removal tank, and the noise reduction effect is further enhanced; when dust deposited on the filter bag needs to be removed, a pulse back-blowing device is started, and a wave-increasing funnel close to the air blowing pipe increases air waves blown out of the air blowing pipe, so that the dust removing effect of the pulse back-blowing device on the filter bag is improved; in addition, along with the air wave moving to the intermediate position of support, the energy of air wave reduces, is difficult for keeping away from the dust of the one end of gas blow pipe on the filter bag, and the wave adding funnel of support intermediate part increases the air wave once more this moment to the dust removal effect of pulse blowback device to the filter bag keep away from the gas blow pipe part.

A blast furnace gas dry dust removal system comprising:

a blast furnace;

the primary dust remover is connected with an output port of the blast furnace through a first pipeline;

the secondary dust collector is connected with an output port of the primary dust collector through a second pipeline, wherein the secondary dust collector at least comprises a cloth bag dust collector and at least one gas dust collector, and the gas dust collector is the gas dust collector; and

and the gas pipe network is used for receiving the gas discharged from the gas dust removing device and the bag-type dust remover.

By adopting the technical scheme, the arrangement of the primary dust remover and the secondary dust remover greatly improves the dust removing effect of the system; in addition, the secondary dust remover at least comprises a cloth bag dust remover and at least one gas dust remover, so that the system can realize the whole purification and recovery effects of blast furnace gas during normal production or during the damping down operation of the blast furnace, thereby meeting the gas purification and recovery requirements under multiple conditions in the operation of the blast furnace.

A damping down dust removal process comprises the following steps:

the blast furnace production: the bag-type dust collector is kept in an open state according to the traditional habit, the gas on-off valve and the gas pipeline main valve are simultaneously opened, the gas source pipe on-off valve is closed, gas to be dedusted can be injected into the dust collection tank through the gas pipeline and the gas inlet, the gas to be dedusted is discharged through the exhaust pipe after being dedusted through the filter bag, and the dust collection tank collects dust falling from the filter bag; and

during the blast furnace damping down operation: detecting the change of the blast furnace top pressure, the blast volume and the pressure in the dust removal tank, and opening an air source pipe on-off valve when the pressure is reduced to a preset range so as to introduce a high-pressure air source into the dust removal tank through the injection air source inlet and the air source pipe; and meanwhile, gradually closing the bag-type dust collector to enable the coal gas to pass through the coal gas dust collector, dedusting the residual coal gas in the blast furnace, the first pipeline, the primary dust collection, the second pipeline and the dust collection tank, discharging the residual coal gas out of the dust collection tank, and entering a downstream pipeline.

By adopting the technical scheme, when the blast furnace is in normal production, the process can purify the blast furnace gas as other blast furnace gas dust removal devices; when the blast furnace is in damping down operation, the process can continue to operate, can be suitable for different working conditions, and can be converted into a working mode through simple operation in practice.

The full gas recovery process comprises the following steps:

detecting the pressure in a blast furnace charging bucket, and opening an air source pipe on-off valve when the pressure is reduced to a preset range so as to introduce a high-pressure air source into the dust removal tank through an injection air source inlet of the injector and an air source pipe; recycling and dedusting residual coal gas in the blast furnace charging bucket, and discharging the residual coal gas out of the dedusting tank; and

and recovering the gas discharged from the dust removing tank.

By adopting the technical scheme, the advantages of the old process are reserved, the problems of large occupied area and high noise of the old process are solved, and the system is more perfect and friendly.

In summary, the present application includes at least one of the following beneficial technical effects:

1. saving the engineering amount and occupied space of reconstruction. The method meets the gas purification and recovery requirements under multiple working conditions in the operation of the blast furnace, improves the gas recovery rate in a damping-down state, reduces the environmental pollution, and can well solve the noise problem of the prior patent;

2. the arrangement of the bypass air inlet pipe can enable the gas dust removing device to be suitable for different working states of the blast furnace, so that the applicability of the gas dust removing device is improved;

3. the combined use of the back-blowing pulse device and the wave-increasing funnel greatly improves the dust removing effect on the filter bag, thereby improving the durability of the gas dust removing device;

4. the total filtering area of the blast furnace gas dust removing device is increased, the filtering speed of gas is reduced, and the service life of a filter bag is prolonged; the number of the filter boxes is increased, and the reliability of gas dry dust removal is improved.

5. When the blast furnace is in normal running, the gas dust collector can also be used as a common blast furnace gas dust collector, so that the use efficiency of the equipment is improved.

Drawings

Fig. 1 is a schematic overall structure of embodiment 1 of the present application.

Fig. 2 is a schematic structural view of the stent in embodiment 1 of the present application.

Fig. 3 is a schematic structural diagram of the wave-adding funnel in embodiment 1 of the present application.

Fig. 4 is a schematic diagram of connection of the bracket and the ejector in embodiment 1 of the present application.

Fig. 5 is a schematic overall structure of embodiment 2 of the present application.

Fig. 6 is a schematic overall structure of embodiment 3 of the present application.

Fig. 7 is a schematic overall structure of embodiment 5 of the present application.

In the figure: 1. a gas dust removing device; 11. a dust removal tank; 12. a filter bag; 13. an ejector; 131. a gas inlet; 132. an injection air source inlet; 14. an ash discharge tank; 141. an upper ash valve; 142. an ash discharge opening; 143. a lower ash discharge valve; 144. a diffusing pipe; 1441. a diffusing pipe on-off valve; 15. an exhaust pipe; 151. an exhaust pipe on-off valve; 2. a gas pipe; 21. a gas on-off valve; 22. a gas pipeline main valve; 23. a recovery valve; 3. an air source pipe; 31. an air source pipe on-off valve; 4. a bypass intake pipe; 41. an air inlet on-off valve; 5. a pulse back-blowing device; 51. an air blowing pipe; 6. a bracket; 61. a through groove; 62. a wave adding funnel; 7. a blast furnace; 8. a first pipe; 9. a second pipe; 10. a primary dust remover; 101. a secondary dust remover; 1011. a bag-type dust collector; 102. a gas pipe network; 1021. a clean gas pipe; 1022. a gas residual pressure recovery device; 1023. a pressure reducing valve group; 1024. a low pressure gas pipe; 103. an ash conveying pipe; 104. a blast furnace charging bucket.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-6.

Example 1

The embodiment of the application discloses a gas dust removal device. Referring to fig. 1, a gas dust removing apparatus includes: a dust removal tank 11, a filter bag 12, an ejector 13 and an ash discharge tank 14.

The filter bag 12 is arranged in the dust removal tank 11, the ejector 13 and the dust removal tank 11 are coaxially arranged, a first end of the ejector 13 is positioned outside the dust removal tank 11, a second end of the ejector 13 penetrates through the bottom of the filter bag 12 and is positioned in the dust removal tank 11, a gas inlet 131 and an ejection gas source inlet 132 are formed in the first end of the ejector 13, the gas inlet 131 is communicated with the gas pipeline 2, one end of the gas pipeline 2 is communicated with the blast furnace 7, the gas pipeline 2 is provided with the gas on-off valve 21 and the gas pipeline main valve 22, and gas to be dedusted can be injected into the dust removal tank 11 through the gas pipeline 2 and the gas inlet 131. In this embodiment, the gas pipe main valve 22 may not be provided according to actual situations, and in this embodiment, the gas pipe main valve 22 is preferably provided.

In addition, the injection air source inlet 132 is connected with the air source pipe 3, the extending direction of the air source pipe 3 is perpendicular to the axial extending direction of the injector 13, and the air source pipe 3 is provided with an air source pipe on-off valve 31. The air source communicated with the air source pipe 3 can be clean gas such as coal gas, nitrogen, steam and the like.

The side wall of the dust removal tank 11 and the upper part of the filter bag 12 are connected with an exhaust pipe 15, an exhaust pipe on-off valve 151 is arranged on the exhaust pipe 15, and the gas to be removed is discharged through the exhaust pipe 15 after being removed through the filter bag 12.

The side wall of the dust removal tank 11 is also connected with a pulse back-blowing device 5, a blowing pipe 51 is connected between the pulse back-blowing device 5 and the dust removal tank 11, and an inlet of the blowing pipe 51 is positioned above the filter bag 12. The pulse back-blowing device 5 can blow off the dust deposited on the filter bag 12 so as to restore the dust removing effect of the filter bag 12.

The bottom side of the dust removal tank 11 is communicated with a bypass air inlet pipe 4, an air inlet of the bypass air inlet pipe 4 is communicated with the gas pipeline 2, an air outlet of the bypass air inlet pipe 4 is positioned below the filter bag 12, and an air inlet on-off valve 41 is arranged on the bypass air inlet pipe 4. The intake on-off valve 41 may be a butterfly valve, a shut-off valve, a check valve, a valve group, or the like. When the pressure in the blast furnace 7 is large, an air inlet on-off valve 41 on the bypass air inlet pipe 4 is opened, so that the air quantity entering the dust removal tank 11 is increased, and the ventilation efficiency is improved; in addition, the gas on-off valve 21 can be closed to close the channel of the ejector 13, so that the dust amount of the pipeline of the ejector 13 is reduced, and the condition that the air source pipe 3 is blocked is avoided as much as possible.

Finally, an ash discharge tank 14 communicates with the bottom of the dust collection tank 11 to collect dust falling from the filter bag 12. An upper ash discharge valve 141 is provided at a communication point between the ash discharge tank 14 and the dust collection tank 11. The bottom of the ash discharge tank 14 is provided with an ash discharge opening 142, and a lower ash discharge valve 143 is arranged at the ash discharge opening 142.

The sidewall of the ash discharging tank 14 is connected with a blow-off pipe 144, and the blow-off pipe 144 is provided with a blow-off pipe on-off valve 1441.

In summary, the ejector 13, the ash discharging tank 14 and the filter bag 12 are all installed on the dust removing tank 11, and the gas dust removing device provided by the application has the same space as the existing bag-type dust remover, so that equipment facilities such as pipelines, equipment supports and valve operating platforms which are independently arranged for the ejector are avoided, the occupied area of the equipment is reduced, external auxiliary facilities are simplified, and reasonable layout of the equipment under the condition of tension of space layout is facilitated.

In addition, because the gas pipeline originally arranged at the center of the dust removal tank 11 is replaced by the ejector, the ejector and the dust remover are skillfully integrated into one device, the dust remover shell is taken as a huge shell of the ejector, the filter bag 12 for filtering dust is arranged inside the dust remover shell, a set of sound insulation cover of the ejector 13 is naturally formed, huge noise generated when the ejector 13 works is sealed inside the dust removal tank 11, noise pollution around the device is greatly reduced, the working environment of on-site workers is improved, and occupational health is facilitated.

Referring to fig. 1, in order to further reduce the volume of noise generated when the ejector 13 is operated as much as possible, the upper end of the dust tank 11 is located at the throat of the ejector 13. The necking part of the ejector 13 is wrapped by the whole dust removal tank 11 so as to prevent noise at the necking part from being transmitted outwards as much as possible.

In addition, referring to fig. 1 and 2, a plurality of brackets 6 are filled between the ejector 13 and the inner wall of the dust removal tank 11. The cross-sectional shape of the bracket can be square, rectangle, diamond and the like, and is preferably circular in the implementation. A plurality of through grooves 61 are formed on the side wall of the bracket 6. The filter bag is sleeved on the bracket and is abutted with the outer peripheral wall of the bracket.

Referring to fig. 3, a plurality of holders 6 are arranged to cross each other, and a filter bag 12 wraps the holders 6. The brackets 6 are arranged to cross each other, so that the propagation path of noise is bent, and the sound wave of the noise is slowly dissipated among the brackets 6, so that the noise volume generated when the ejector 13 works is further reduced.

Referring to fig. 2 and 4, in order to enhance the dust removing effect of the pulse back-blowing device 5 on the filter bag 12, a wave-increasing funnel 62 is disposed at one end of the bracket 6 close to the air blowing pipe 51 and at the middle part in the bracket 6. The wave-increasing funnel 62 is a tubular body with wide ends and narrow middle, when the air wave blown out from the air blowing pipe 51 enters from one end of the wave-increasing funnel 62, the air wave is compressed at a certain degree at a narrow position due to the narrow middle of the wave-increasing funnel 62, then the air wave reaches a wide opening at the other end of the wave-increasing funnel 62, the flow speed of the air wave is accelerated, and part of the air wave is dispersed along the periphery, so that the air wave passes through the through groove 61 on the bracket 6 and blows to the filter bag 12, the blowing direction of the air wave forms a certain included angle with the filter bag 12, and the air wave is blown to the filter bag 12 from the inner periphery of the filter bag 12, so that the air wave is relatively easier to blow off dust on the filter bag 12.

In addition, the energy of the air wave is relatively reduced along with the movement of the air wave, so that the wave-increasing funnel 62 arranged at the middle part in the bracket 6 again enhances the energy of the air wave, thereby blowing off dust on the part of the filter bag 12 relatively far from the air blowing pipe 51, and further enhancing the dust removing effect on the filter bag 12.

In embodiment 2, referring to fig. 5, the difference between this embodiment and embodiment 1 is that the position of the air source tube 3 is different, and the extending direction of the air source tube 3 is the same as the axial extending direction of the ejector 13.

When the gas source pipe on-off valve 31 is opened, the gas in the gas source pipe 3 is directly injected into the dust removal tank 11 along the axial extending direction of the ejector 13 from the injection gas source inlet 132, so that the gas flow speed in the ejector 13 is relatively high, and the dust removal efficiency of the gas dust removal device 1 is relatively high and the dust removal effect is relatively good.

Example 3

The embodiment of the application discloses a blast furnace gas dry dedusting system. Referring to fig. 6, the blast furnace gas dry dust removal system includes: blast furnace 7, primary dust collector 10, secondary dust collector 101, gas pipe network 102.

The blast furnace 7 is used for smelting, and the gas generated during smelting of the blast furnace contains combustible gas components such as carbon monoxide which can be utilized, and the combustible gas components need to be sequentially dedusted by a multi-stage deduster.

The primary dust remover 10 is connected with the output port of the blast furnace 7 through the first pipeline 8, and the primary dust remover in the embodiment can be a gravity dust remover, an inertial dust remover, a cyclone dust remover, a filter dust remover, a wet dust remover and the like, and the primary dust remover 10 mainly performs primary dust removal on large particles in coal gas.

The secondary dust remover 101 is connected with an output port of the blast furnace 7 through a second pipeline 9, and the secondary dust remover 101 mainly removes dust further on the primarily removed gas so as to improve the dust removal effect. The secondary dust remover 101 at least comprises a gas dust remover 1, wherein the gas dust remover 1 is a dust remover with an ejector 13 and an air source pipe 3, and other secondary dust removers 101 are bag dust removers 1011 without the ejector 13 and the air source pipe 3; the number of the gas dust removing device 1 and the bag-type dust remover 1011 can be determined to be opened according to the amount of the gas generated by the blast furnace, so as to be suitable for different states of the blast furnace during operation. And the bag-type dust remover 1011 can have various structures such as an ejection structure, a bottom ejection structure and the like.

A gas pipe network 102 for receiving the gas discharged from the secondary dust collector 101 so as to recover the recyclable gas.

The number of the secondary dust collectors 101 can be determined according to specific situations, and the secondary dust collectors 101 are all connected in parallel or connected in series through pipelines; in addition, an ash conveying pipe 103 is arranged below the secondary dust remover 101, and each ash discharging tank 14 of the secondary dust remover 101 is communicated with the ash conveying pipe 103.

When the ash is discharged from the ash discharge tank 14, the upper ash discharge valve 141 is closed, and the on-off valve of the diffusing pipe 144 and the lower ash discharge valve 143 are opened, so that the dust in the tank is discharged to the ash conveying pipe 103 through the ash discharge hole 142. The discharged dust can be transported away by a vehicle for recycling after passing through a humidifying ash discharger, and can be directly collected by a closed tank car for recycling. And the waste water can be collected into a large ash plant of a dry dedusting system in a concentrated manner for concentrated treatment. Meanwhile, according to actual situation, the ash conveying pipe 103 or other ash receiving devices can be omitted below the secondary dust collector 101.

Finally, the gas pipe network 102 includes a clean gas pipe 1021, a residual gas pressure recovery device 1022 (TR or BPRT), a pressure reducing valve 1023, and a low pressure gas pipe 1024, the exhaust pipe 15 on the dust remover is all connected with the clean gas pipe 1021, and the clean gas pipe 1021, the residual gas pressure recovery device 1022, and the low pressure gas pipe 1024 are sequentially connected, the pressure reducing valve 1023 is connected in parallel with the residual gas pressure recovery device 1022, and the pressure reducing valve 1023 can decompress the recovered gas for subsequent use.

When the blast furnace 7 is in a damping down operation state, the change of the pressure and the air quantity at the top of the blast furnace 7 is detected, when the pressure and the air quantity are reduced to a preset range, the air source pipe on-off valve 31 is opened to introduce a high-pressure air source into the dust removal tank 11 through the injection air source inlet 132 and the air source pipe 3, meanwhile, the bag dust remover 1011 is gradually closed, so that the gas passes through the gas dust removal device 1, the blast furnace 7, the first pipeline 8, the primary dust remover 10 and the second pipeline 9 are discharged out of the dust removal tank 11 after dust removal, and the gas is conveyed to the gas pipe network 102 after filtration and purification, thereby realizing the purification and recovery of the damping down gas of the blast furnace.

The system in this embodiment increases the area of the filter bag 12 of the whole system by providing the primary dust collector 10 and the secondary dust collector 101, thereby increasing the total filtering area of the blast furnace gas dust collector 1. And the number of the filter bags 12 is increased, so that the filtering speed of the coal gas is reduced, and the service life of the filter bags 12 is prolonged. Meanwhile, the system increases the number of the filter boxes and improves the reliability of gas dry dust removal. Moreover, the system meets the gas purification and recovery requirements under multiple working conditions in the operation of the blast furnace 7, improves the gas recovery rate in the damping-down state, and reduces the environmental pollution.

The implementation principle of the blast furnace gas dry dedusting system provided by the embodiment of the application is as follows: when the blast furnace 7 is normally produced, the bag-type dust collector 1011 is kept in an open state according to the conventional habit, and simultaneously, the gas on-off valve 21, the gas pipeline main valve 22 and the gas source pipe on-off valve 31 on the gas pipeline 2 are opened, and gas is injected into the ejector 13 from the gas pipeline 2 and the gas inlet 131 and then enters the bottom of the dust collection tank 11 along the ejector 13. Then the gas rises from the bottom of the dust-removing tank 11 to pass through the filter bag 12, the filter bag 12 filters the gas, and the filtered gas is discharged out of the dust-removing tank 11 along the exhaust pipe 15 above the dust-removing tank 11. The filtered dust is collected by another device according to the actual situation. In addition, when the air quantity of the blast furnace 7 is large, an air inlet on-off valve 41 on the bypass air inlet pipe 4 is opened, and the coal gas directly enters the bottom of the dust removal tank 11 from the bypass air inlet pipe 4 so as to improve ventilation efficiency; and the channel of the ejector 13 can be closed through the gas on-off valve 21 so as to reduce the dust amount of the pipeline of the ejector 13, thereby avoiding the occurrence of the condition of blocking the air source pipe 3 as much as possible. In this state, the injector 13 is used only as a pipe for transporting blast furnace gas so that the gas pipe 2 and the gas inlet 131 can smoothly enter the dust removing tank 11.

When the blast furnace 7 is in a damping down operation state, the blast furnace 7 top pressure and air quantity change, when the pressure and air quantity fall to a preset range, the air source pipe on-off valve 31 is opened to introduce a high-pressure air source into the dust removal tank 11 through the injection air source inlet 132 and the air source pipe 3, and meanwhile, the bag dust remover 1011 is gradually closed, so that the gas passes through the gas dust removal device 1, and the residual gas of the blast furnace 7, the first pipeline 8, the primary dust remover 10 and the second pipeline 9 is removed and discharged out of the dust removal tank 11. In this state, the ejector 13 has an ejector function, and is used for ejecting a high-pressure gas source into the dust removal tank, and high-pressure gas is ejected into the ejector through a nozzle to form negative pressure, so that residual gas in the blast furnace 7, the first pipeline 8, the primary dust remover 10 and the second pipeline 9 is forcedly recovered, and the full recovery of the damping down and releasing gas is realized.

The process solves the problem that the prior process can not realize the treatment of the damping down and releasing gas, simultaneously realizes the complete recovery of the damping down and releasing gas of the blast furnace 7, and no longer has the pollution problem of the damping down and releasing gas on the direct air discharge.

Example 4

The embodiment of the application discloses a damping down dust removal process, which comprises the following steps:

the blast furnace production: the bag-type dust remover 1011 is kept in an open state according to the conventional habit, and simultaneously, the gas on-off valve 21 and the gas pipeline main valve 22 are opened, the gas source pipe on-off valve 31 is closed, the gas to be dedusted can be injected into the dedusting tank 11 through the gas pipeline 2 and the gas inlet 131, the gas to be dedusted is discharged through the exhaust pipe 15 after being dedusted through the filter bag 12, and the dust falling from the filter bag 12 is collected by the dust discharging tank 14; and

during the blast furnace 7 damping down operation: when the pressure is reduced to a preset range, the gas source pipe on-off valve 31 is opened to introduce a high-pressure gas source into the dust removal tank 11 through the injection gas source inlet 132 and the gas source pipe 3; meanwhile, the bag dust remover 1011 is gradually closed, so that the gas passes through the gas dust remover 1, and the residual gas in the blast furnace 7, the first pipeline 8, the primary dust remover 10, the second pipeline 9 and the dust removing tank 11 is removed, and then the residual gas is discharged out of the dust removing tank 11 and enters a downstream pipeline.

In summary, in the gas dust removal device 1, the damping down dust removal system and the damping down dust removal process provided by the application, the ejector 13 is arranged in the dust removal tank 11, and the blast furnace 7 can purify blast furnace gas as the other bag-type dust collectors 1011 during normal production; when the blast furnace 7 is in damping down operation, the system can continue to operate, the process can be suitable for different working conditions, and in practice, the working mode can be switched through simple operation; and the high-pressure gas source can be coal gas, nitrogen, steam and the like, and has wide application range.

Example 5

Referring to fig. 7, the embodiment discloses a gas full recovery process, which specifically comprises the following steps:

step S1: detecting the pressure in the blast furnace charging bucket 104, and opening the air source pipe on-off valve 31 when the pressure falls to a preset range so as to introduce a high-pressure air source into the dust removal tank 11 through the injection air source inlet 132 and the air source pipe 3; the residual gas in the dust removal tank 11 is recovered and removed, and then discharged out of the dust removal tank 11.

Step S2: the gas discharged through the dust tank 11 is recovered by using the gas pipe network 102 as in example 4.

The blast furnace charging bucket 104 is a device used together with the blast furnace 7, and is mainly used for feeding materials into the blast furnace. In the production of the blast furnace 7, the pressure in the blast furnace 7 needs to be the same as the pressure in the blast furnace tank 104, so that a certain amount of gas is also present in the blast furnace tank 104, and the gas in the blast furnace tank 104 can be recovered by the above-mentioned process.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (10)

1. A gas dust removal device, comprising: the dust removal device comprises a dust removal tank (11), a filter bag (12), an ejector (13) and an ash discharge tank (14), wherein the filter bag (12) is arranged in the dust removal tank (11), the ejector (13) is arranged along the axial direction of the dust removal tank (11), a first end of the ejector (13) is positioned outside the dust removal tank (11), a second end of the ejector (13) penetrates through the bottom of the filter bag (12) and is positioned in the dust removal tank (11), a gas inlet (131) and an injection gas source inlet (132) are formed in the first end of the ejector (13), the gas inlet (131) is communicated with a gas pipeline (2), and a gas on-off valve (21) and a gas pipeline main valve (22) are arranged on the gas pipeline (2), so that to-be-dedusted gas can be injected into the dust removal tank (11) through the gas pipeline (2), the gas inlet (131) and the gas ejector (13). The injection air source inlet (132) is connected with an air source pipe (3), and an air source pipe on-off valve (31) is arranged on the air source pipe (3); the dust removal device is characterized in that an exhaust pipe (15) is connected to the side wall of the dust removal tank (11) and above the filter bag (12), the gas to be dedusted passes through the filter bag (12) and is discharged through the exhaust pipe (15), and the ash discharge tank (14) is communicated with the bottom of the dust removal tank (11) to collect dust falling from the filter bag (12).

2. A gas dust removal apparatus as claimed in claim 1, wherein: the extending direction of the air source pipe (3) is perpendicular to the axial extending direction of the ejector (13).

3. A gas dust removal apparatus as claimed in claim 1, wherein: the extending direction of the air source pipe (3) is the same as the axial extending direction of the ejector (13).

4. A gas dust collector as claimed in claim 1, characterized in that the upper end of the dust collection tank (11) is located at the throat of the ejector (13).

5. The gas dust removal device of claim 4, wherein: the dust removal tank is characterized in that a bypass air inlet pipe (4) is communicated with the bottom side of the dust removal tank (11), an air inlet of the bypass air inlet pipe (4) is communicated with the gas pipeline (2), an air outlet of the bypass air inlet pipe (4) is positioned below the filter bag (12), and an air inlet on-off valve (41) is arranged on the bypass air inlet pipe (4).

6. A gas dust collector according to any one of claims 1-5, wherein: the dust removal tank is characterized in that a pulse back-blowing device (5) is connected to the side wall of the dust removal tank (11), a gas blowing pipe (51) is connected between the pulse back-blowing device (5) and the dust removal tank (11), and an inlet of the gas blowing pipe (51) is positioned above the filter bag (12).

7. A gas dust removal apparatus as claimed in claim 1, wherein: a plurality of brackets (6) are filled between the ejector (13) and the inner wall of the dust removal tank (11), the brackets (6) are arranged in a crossing way, and the filter bag (12) wraps the brackets (6); and

one end of the support (6) is opposite to the inlet of the air blowing pipe (51), and a wave increasing funnel (62) is arranged at one end of the support (6) close to the air blowing pipe (51) and at the middle part in the support (6).

8. A blast furnace gas dry dust removal system, comprising:

a blast furnace (7);

the primary dust remover (10) is connected with an output port of the blast furnace (7) through a first pipeline (8);

the secondary dust collector (101) is connected with an output port of the primary dust collector (10) through a second pipeline (9), wherein the secondary dust collector (101) at least comprises a cloth bag dust collector (1011) and at least one gas dust collector (1), and the gas dust collector (1) is the gas dust collector (1) according to any one of claims 1-7; and

and a gas pipe network (102) for receiving the gas discharged from the gas dust collector (1) and the bag-type dust collector (1011).

9. A damping down dust removal process, characterized in that a blast furnace gas dry dust removal system according to claim 8 is provided, and comprises the following steps:

when the blast furnace (7) is produced: the bag-type dust remover (1011) is kept in an open state according to the traditional habit, meanwhile, the gas on-off valve (21) and the gas pipeline main valve (22) are opened, the gas source pipe (3) on-off valve is closed, the gas to be dedusted can be injected into the dedusting tank (11) through the gas pipeline (2) and the gas inlet (131), the gas to be dedusted is discharged through the exhaust pipe (15) after being dedusted through the filter bag (12), and the dust discharging tank (14) collects dust falling from the filter bag (12); and

when the blast furnace (7) is in damping down operation: detecting the change of the furnace top pressure and air quantity of the blast furnace (7) and the pressure in the dust removal tank (11), and opening an on-off valve of an air source pipe (3) when the pressure is reduced to a preset range so as to introduce a high-pressure air source into the dust removal tank (11) through the injection air source inlet (132) and the air source pipe (3); simultaneously, the bag dust collector (1011) is gradually closed, so that the coal gas passes through the coal gas dust collector (1), and residual coal gas in the blast furnace (7), the first pipeline (8), the primary dust collector (10), the second pipeline (9) and the dust collection tank (11) is removed and discharged out of the dust collection tank (11) to enter a downstream pipeline.

10. A gas full recovery process, characterized in that a gas dust removal device according to any one of claims 1-7 is provided, and comprising the steps of:

detecting the pressure in a blast furnace charging bucket (104), and opening an on-off valve of an air source pipe (3) when the pressure is reduced to a preset range so as to introduce a high-pressure air source into the dust removal tank (11) through an injection air source inlet (132) of the injector (13) and the air source pipe (3); recycling and dedusting residual coal gas in the blast furnace charging bucket (104) and discharging the residual coal gas out of the dedusting tank (11); and

recovering the gas discharged from the dust removing tank (11).

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