CN211562352U

CN211562352U - Blast furnace gas gravity dust removal system

Info

Publication number: CN211562352U
Application number: CN201922295994.5U
Authority: CN
Inventors: 刘炜; 董兴龙
Original assignee: Yunnan Qu Jing Cheng Gang Iron And Steel Group Co ltd
Current assignee: Yunnan Qu Jing Cheng Gang Iron And Steel Group Co ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-09-25
Anticipated expiration: 2029-12-19

Abstract

The utility model discloses a blast furnace gas gravity dust pelletizing system, including crude gas pipeline, case and ash pipe are subsided to the one-level, crude gas pipeline's exit end is connected with the transition taper pipe, install the push-pull valve on the transition taper pipe, the exit end of transition taper pipe is connected with first communicating pipe, a plurality of gravity dust removal awl are installed to the lower part in the one-level subsides the incasement, first communicating pipe and one of them gravity dust removal awl intercommunication, upper filter screen and lower floor's filter screen are installed to the interval about in the one-level subsides the incasement, install deashing mechanism between upper filter screen and the lower floor's filter screen, install the blast pipe on the one-level subsides the case, the second grade subsides the case is installed to the bottom of blast pipe, radially install rotatory fender dirt mechanism. The system can thoroughly remove dust with large and medium particle sizes in the coal gas, and has the advantages of novel structure, remarkable dust removal effect, high dust removal efficiency, low later-stage use cost and strong adaptability.

Description

Blast furnace gas gravity dust removal system

Technical Field

The utility model belongs to the technical field of the steelmaking, concretely relates to blast furnace gas gravity dust pelletizing system.

Background

Blast furnace gas is the gas that produces when blast furnace ironmaking, is the main energy that iron and steel enterprise used inside, and the coal gas that generally goes out from the blast furnace roof contains a large amount of dusts (the dust comprises coke breeze, mine dust), can not directly use, because dusty coal gas can block up gas piping, burner of burner etc. simultaneously can the reflow and bond on heat transfer device under the high temperature combustion condition, leads to the thermal efficiency to reduce, damages equipment etc. so, blast furnace gas need can the reutilization after removing dust. The traditional blast furnace gas is subjected to primary dust removal by a gravity dust remover or a cyclone dust remover, then enters a bag-type dust remover for secondary dust removal, or adopts washing type secondary dust removal, and then the clean gas meeting the corresponding standard is recovered. In the prior art, the commonly used gravity dust collector is a dust baffle plate with different structures and obliquely arranged in a dust collection box, and the rising air force is blocked by utilizing the blocking effect of the dust baffle plate, so that dust in coal gas is settled. Although the gravity dust removal box of this structure can subside the large granule dust in the coal gas to a certain extent, the effect of its dust removal is not good, can not get rid of the great granule of granularity in the coal gas, handles the burden heavier to subsequent sack dust removal, and the equipment volume of gravity dust removal box is great, needs great arrangement place, and the pipe arrangement is comparatively complicated, and the investment cost of equipment is higher. Therefore, the development and development of the blast furnace gas gravity dust removal system which has the advantages of novel structure, obvious dust removal effect, high dust removal efficiency, low later-stage use cost and strong adaptability is objectively needed.

Disclosure of Invention

An object of the utility model is to provide a blast furnace gas gravity dust pelletizing system that novel structure, dust removal effect are showing, dust collection efficiency is high, later stage use cost is low, strong adaptability.

The utility model aims at realizing the purposes, which comprises a crude gas pipeline, a primary settling tank and an ash discharge pipe arranged at the bottom of the primary settling tank, wherein the outlet end of the crude gas pipeline is connected with a transition taper pipe, a gate valve is arranged on the transition taper pipe, the outlet end of the transition taper pipe is connected with a first communication pipe, a plurality of gravity dust-removing cones are arranged at the lower part in the primary settling tank, two adjacent gravity dust-removing cones are communicated through the communication pipe, the outlet end of the first communication pipe is communicated with one gravity dust-removing cone, a spiral diversion groove is arranged on the inner wall of the gravity dust-removing cone, the inner diameter at the top of the gravity dust-removing cone is smaller than the inner diameter at the bottom, an upper filter screen and a lower filter screen are arranged at intervals up and down in the primary settling tank above the gravity dust-removing cone, an ash cleaning mechanism is arranged between the upper filter screen, the blast pipe is square pipe, install the second grade in the bottom of blast pipe and subside the case, the bottom that the case was subsided to the second grade is provided with the deashing mouth, radially install rotatory dust retaining mechanism in the intercommunication department of blast pipe and second grade settlement case, rotatory dust retaining mechanism includes pivot and beam barrel, the pivot is rotated and is installed on the case is subsided to the second grade, the beam barrel is installed in the pivot, polylith metal sheet is installed to the equipartition on the axial direction of following the beam barrel on the beam barrel, leave 1 ~ 3 mm's clearance between the edge of metal sheet and the top of blast pipe, the inherent non return mechanism who uses with rotatory dust retaining mechanism cooperation is installed to one side that is close to.

Further, non return mechanism includes first reset spring and check board, the articulated installation of check board is on the inner wall of second grade settling tank, the upper surface of check board is through the inner wall connection of first reset spring with the second grade settling tank, the articulated second connecting rod that is connected with of lower surface of check board, the slider is installed to the lower extreme of second connecting rod, the vertical slide rail that installs on the inner wall of second grade settling tank, slider slidable mounting is on the slide rail.

Further, the fixed plate is installed at one side that is close to the air outlet at the top in the second grade settling tank, and the articulated air conditioning plate that is connected with of upper surface of fixed plate, one side of air conditioning plate is passed through the second spring and is connected with the bottom of blast pipe, installs the stay cord between the opposite side of air conditioning plate and the check plate, be connected with the fixed pulley on the stay cord, the fixed pulley is installed on the fixed plate.

Further, deashing mechanism includes screw rod, movable block and gear motor, the screw rod passes through the bearing frame and rotates to be installed in the one-level settling tank, gear motor installs the outside at the one-level settling tank and is connected with the screw rod transmission, movable block threaded connection is on the screw rod, the upper surface and the lower surface of movable block are connected with the deashing brush through first connecting rod respectively.

Furthermore, the bottom in the primary settling tank is set to be in a cone hopper shape, and the bottom in the secondary settling tank is set to be in a slope type structure.

Furthermore, an electrified electrode is installed at one side, close to the air inlet, of the top in the secondary sedimentation box, and the gap between the electrified electrode and the edge of the metal plate is 3-5 mm.

Further, a coal tar adsorption material is installed on the gate valve.

The utility model has the advantages that: firstly, the gravity dust removal cone can enable gas to generate rotational flow in the gravity dust removal cone, the spiral flow guide groove is formed in the gravity dust removal cone, the gas generates rotational flow in the spiral separation groove, dust is settled under the action of centrifugal force, and the spiral flow guide groove can greatly improve the rotational flow degree of the gas and improve the rotational flow dust removal efficiency of the gas; the upper filter screen and the lower filter screen can further block and separate dust in the coal gas, and the dust adhered to the upper filter screen and the lower filter screen can be regularly cleaned through the dust cleaning mechanism, so that the dust removing effect and the dust removing efficiency of the upper filter screen and the lower filter screen are ensured; thirdly, the flowing speed of the coal gas in the exhaust pipe is utilized to provide power for the rotation of the rotary dust blocking mechanism, so that the dust in the coal gas can be blocked and separated by utilizing the rotating metal plate in the rotating process of the rotary dust blocking mechanism, and the coal gas can rapidly separate the dust while passing through the rotary dust blocking mechanism. The utility model discloses a tertiary dust removal structure in one-level dust removal case and the second grade dust removal incasement, the dust of big particle diameter and medium particle diameter in the getting rid of coal gas that can be thorough has novel structure, dust removal effect to show, dust collection efficiency is high, later stage use cost is low, strong adaptability's advantage, can produce good economic benefits and social, easily uses widely.

Drawings

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

in the figure: 1-raw gas pipeline, 2-transition taper pipe, 3-gate valve, 4-first communicating pipe, 5-lower layer filter screen, 6-speed reducing motor, 7-upper layer filter screen, 8-primary settling tank, 9-screw, 10-ash removing brush, 11-first connecting rod, 12-movable block, 13-gravity dust removing cone, 14-ash removing pipe, 15-exhaust pipe, 16-charged electrode, 17-metal plate, 18-rotating shaft, 19-shaft roller, 20-air adjusting plate, 21-second return spring, 22-fixed plate, 23-fixed pulley, 24-first return spring, 25-slide rail, 26-slide block, 27-second connecting rod, 28-check plate and 29-secondary settling tank.

Detailed Description

The following further describes the present invention with reference to the attached drawings, but the present invention is not limited in any way, and any changes or improvements based on the teaching of the present invention all belong to the protection scope of the present invention.

As shown in figure 1, the utility model comprises a crude gas pipeline 1, a primary settling tank 8 and an ash discharge pipe 14 arranged at the bottom of the primary settling tank 8, wherein the outlet end of the crude gas pipeline 1 is connected with a transition taper pipe 2, the transition taper pipe 2 is provided with a gate valve 3, the outlet end of the transition taper pipe 2 is connected with a first communication pipe 4, the lower part in the primary settling tank 8 is provided with a plurality of gravity dust-removing cones 13, the adjacent two gravity dust-removing cones 13 are communicated through the communication pipe, the outlet end of the first communication pipe 4 is communicated with one gravity dust-removing cone 13, the inner wall of the gravity dust-removing cone 13 is provided with a spiral diversion groove, the top inner diameter of the gravity dust-removing cone 13 is smaller than the bottom inner diameter, an upper filter screen 7 and a lower filter screen 5 are arranged in the primary settling tank 8 above the gravity dust-removing cone 13 at intervals up and down, an ash removal mechanism is arranged between the upper filter screen, install blast pipe 15 on the one-level settling cask 8 of upper filter screen 7 top, blast pipe 15 is square pipe, installs second grade settling cask 29 in the bottom of blast pipe 15, and the bottom of second grade settling cask 29 is provided with the deashing mouth, radially installs rotatory dust blocking mechanism in blast pipe 15 and second grade settling cask 29's intercommunication department, rotatory dust blocking mechanism includes pivot 18 and beam barrel 19, pivot 18 rotates and installs on second grade settling cask 29, beam barrel 19 installs in pivot 18, polylith metal sheet 17 is installed to the last equipartition of beam barrel 19's axial direction of following of beam barrel 19 on the beam barrel 19, leave 1 ~ 3 mm's clearance between the edge of metal sheet 17 and the top of blast pipe 15, the non return mechanism that uses with rotatory dust blocking mechanism cooperation is installed to the one side that is close to the air outlet in second grade settling cask 29.

The utility model discloses a working process is: coal gas enters the gravity dust removing cone 13 through the first communicating pipe 4, the coal gas generates rotational flow inside the gravity dust removing cone 13, the spiral flow guide groove is arranged on the inner wall of the gravity dust removing cone 13, the spiral flow guide groove on the gravity dust removing cone 13 improves the rotational flow degree of the coal gas, the rotational flow dust removing efficiency of the coal gas is greatly improved, the coal gas generates rotational flow inside the gravity dust removing cone 13, large particle dust is settled down due to the centrifugal force, the inner diameter of the bottom of the gravity dust removing cone 13 is larger than the inner diameter of the top of the gravity dust removing cone 13, the coal gas moves upwards after entering the gravity dust removing cone 13, the speed of the coal gas is increased after entering the top of the gravity dust removing cone 13, the centrifugal force applied to the large particle dust is increased, the settling efficiency of the large particle dust is accelerated, the coal gas enters the region of the lower filter screen 7 and the upper filter screen 5, discharge from blast pipe 15, and can clean the dust of adhesion on upper filter screen 7 and lower floor's filter screen 5 regularly through deashing mechanism, with dust removal effect and the dust collection efficiency who guarantees upper filter screen 7 and lower floor's filter screen 5, utilize the flow velocity of the coal gas that gets into in blast pipe 15, the rotation that gives rotatory dust blocking mechanism provides power, make rotatory dust blocking mechanism in rotatory process, utilize rotatory metal sheet 17 to make the dust in the coal gas separate, the separation, and make coal gas make the dust by quick separation when passing rotatory dust blocking mechanism, let the dust of well small granule in the coal gas fall in second grade dust removal case 29 according to gravity, the setting of non return mechanism can be patted the dust of adhesion on the metal sheet 17 simultaneously, dust stronger to the adhesion has better separation effect.

Further, non return mechanism includes first reset spring 24 and non return plate 28, non return plate 28 articulates and installs on the inner wall of second grade settling tank 29, the upper surface of non return plate 28 passes through first reset spring 24 and second grade settling tank 29's inner wall connection, the articulated second connecting rod 27 that is connected with of lower surface of non return plate 28, slider 26 is installed to the lower extreme of second connecting rod 27, vertically install slide rail 25 on the inner wall of second grade settling tank 29, slider 26 slidable mounting is on slide rail 25, and non return mechanism can prevent rotatory dust removal mechanism anticlockwise rotation on the one hand (using fig. 1 as an example), and on the other hand can beat the dust of adhesion on the rotatory dust removal mechanism down.

In order to achieve a better dust removal effect and prevent the gas from passing through the rotary dust removal mechanism at an excessively high speed, so that a dust separation effect is poor, a fixing plate 22 is installed at one side, close to an air outlet, of the top in the secondary settling tank 29, an air adjusting plate 20 is hinged to the upper surface of the fixing plate 22, one side of the air adjusting plate 20 is connected with the bottom of the exhaust pipe 15 through a second spring 21, a pull rope is installed between the other side of the air adjusting plate 20 and a check plate 28, a fixed pulley 23 is connected to the pull rope, and the fixed pulley 23 is installed on the fixing plate 22; when the check plate 28 is horizontal, the air adjusting plate 20 is in a state of inclining towards one end of the air outlet, so that the discharge of coal gas cannot be influenced, because the air adjusting plate 20 is connected with the check plate 28 through the pull rope, when the coal gas speed is too high, the speed of beating the check plate 28 by the rotary dust removing mechanism is too high, the check plate 28 is not completely reset and then inclines again, and the air adjusting plate 20 is driven by the pull rope to keep an approximately inclined state, because of the inclination of the air adjusting plate 20, part of the coal gas is shunted into the lower secondary settling tank 29 along the inclined plane of the air adjusting plate 20 at the moment until the rotating speed of the rotary dust removing mechanism is slowed down, and the check plate 28 can be reset, the two can be matched with the discharge amount of the adjustable coal gas, so that the redundant coal gas secondary treatment is realized, and the separation rate of.

Further, the deashing mechanism includes screw rod 9, movable block 12 and gear motor 6, screw rod 9 rotates through the bearing frame and installs in one-level settling tank 8, gear motor 6 installs the outside at one-level settling tank 8 and is connected with screw rod 9 transmission, 12 threaded connection of movable block are on screw rod 9, the upper surface and the lower surface of movable block 12 are connected with deashing brush 10 through first connecting rod 11 respectively, and during the deashing, gear motor 6 drives screw rod 9 and rotates, and then makes movable block 12 horizontal slip on screw rod 11 to make deashing brush 10 carry out the contact friction rather than the filter screen of contact, thereby realize the deashing to the filter screen.

In order to facilitate timely dust discharge to be settled in the dust removal case, the bottom in the one-level settling box 8 is set into the cone hopper shape, and the ash discharge pipe 14 is arranged at the bottom of the funnel-shaped one-level settling box 8, the bottom in the second-level settling box 29 is set into a slope structure, and the ash discharge port is arranged at the lower side of the slope.

In order to further improve the dust removal effect, a charged electrode 16 is installed at one side, close to an air inlet, of the top in the secondary sedimentation box 29, the charged electrode 16 is permanently polarized under the action of strong electricity, the electric charge quantity at two ends is fixed and unchanged, a gap between the charged electrode 16 and the edge of the metal plate 17 is 3-5 mm, coal gas exhausted from the primary sedimentation box 8 enters from the exhaust pipe 15 and pushes the metal plate 17 to rotate, so that the metal plate 17 is continuously close to and separated from the charged electrode 16, because the metal plate 17 is insulated from the ground and is uncharged, according to the electrostatic induction principle, when the metal plate 17 is close to the charged electrode 16, charge transfer occurs inside the metal plate, one end, close to the charged electrode 16, is in a negative polarity, and the opposite end is in a positive polarity, when the coal gas pushes the metal plate 17 to rotate, charge transfer occurs on small and medium-sized dust on, its one end near the metal plate 17 is positive polarity, thus is adsorbed on the metal plate with negative polarity, until the end where the dust is adhered is farther from the charged electrode 16 and the other end is closer to the charged electrode 16, until the other side of the metal plate 17 is close to the charged electrode 16, so that the charge on the dust is neutralized, at which time the dust falls into the secondary settling tank 29 by gravity.

Furthermore, a coal tar adsorbing material is installed on the gate valve 3, coal tar in coal gas can be adsorbed through the coal tar adsorbing material, the subsequent coal gas dust removal burden is reduced, and the coal tar active material can be activated carbon, expanded graphite and the like.

Claims

1. The utility model provides a blast furnace gas gravity dust pelletizing system, includes raw coke oven gas pipeline (1), one-level settling box (8) and sets up ash discharge pipe (14) in one-level settling box (8) bottom, its characterized in that: the dust removing device is characterized in that the outlet end of the raw gas pipeline (1) is connected with a transition taper pipe (2), a gate valve (3) is installed on the transition taper pipe (2), the outlet end of the transition taper pipe (2) is connected with a first communicating pipe (4), a plurality of gravity dust removing cones (13) are installed at the lower part in a primary settling box (8), two adjacent gravity dust removing cones (13) are communicated through the communicating pipe, the outlet end of the first communicating pipe (4) is communicated with one of the gravity dust removing cones (13), a spiral diversion trench is arranged on the inner wall of the gravity dust removing cone (13), the top inner diameter of the gravity dust removing cone (13) is smaller than the bottom inner diameter, an upper filter screen (7) and a lower filter screen (5) are installed in the primary settling box (8) above the gravity dust removing cone (13) at an upper interval and a lower interval, and a dust removing mechanism is installed between the upper filter screen (7), an exhaust pipe (15) is arranged on the primary settling tank (8) above the upper filter screen (7), the exhaust pipe (15) is a square pipe, a secondary sedimentation tank (29) is arranged at the bottom of the exhaust pipe (15), an ash cleaning port is arranged at the bottom of the secondary sedimentation tank (29), a rotary dust-blocking mechanism is radially arranged at the communication position of the exhaust pipe (15) and the secondary sedimentation tank (29), the rotary dust blocking mechanism comprises a rotating shaft (18) and a shaft roller (19), the rotating shaft (18) is rotatably arranged on a secondary sedimentation box (29), the shaft roller (19) is arranged on the rotating shaft (18), a plurality of metal plates (17) are uniformly arranged on the shaft roller (19) along the axial direction of the shaft roller (19), a gap of 1-3 mm is left between the edge of the metal plate (17) and the top of the exhaust pipe (15), and a non-return mechanism matched with the rotary dust blocking mechanism for use is arranged on one side close to the air outlet in the secondary sedimentation box (29).

2. The blast furnace gas gravity dust removal system according to claim 1, wherein: non return mechanism includes first reset spring (24) and check board (28), the articulated installation of check board (28) is on the inner wall of second grade settling tank (29), the upper surface of check board (28) is through the interior wall connection of first reset spring (24) and second grade settling tank (29), the articulated second connecting rod (27) that is connected with of lower surface of check board (28), slider (26) are installed to the lower extreme of second connecting rod (27), vertical slide rail (25) of installing on the inner wall of second grade settling tank (29), slider (26) slidable mounting is on slide rail (25).

3. The blast furnace gas gravity dust removal system according to claim 2, wherein: fixed plate (22) are installed at one side that is close to the air outlet at the top in second grade settling tank (29), and the articulated air regulation board (20) that is connected with of upper surface of fixed plate (22), one side of air regulation board (20) is passed through second spring (21) and is connected with the bottom of blast pipe (15), installs the stay cord between the opposite side of air regulation board (20) and check plate (28), be connected with fixed pulley (23) on the stay cord, fixed pulley (23) are installed on fixed plate (22).

4. The blast furnace gas gravity dust removal system according to claim 1, wherein: the deashing mechanism includes screw rod (9), movable block (12) and gear motor (6), screw rod (9) rotate through the bearing frame and install in one-level settling tank (8), gear motor (6) are installed in the outside of one-level settling tank (8) and are connected with screw rod (9) transmission, movable block (12) threaded connection is on screw rod (9), the upper surface and the lower surface of movable block (12) are connected with deashing brush (10) through first connecting rod (11) respectively.

5. The blast furnace gas gravity dust removal system according to claim 1, wherein: the bottom in the primary settling tank (8) is set to be in a cone hopper shape, and the bottom in the secondary settling tank (29) is set to be in a slope type structure.

6. The blast furnace gas gravity dust removal system according to claim 1, wherein: the top in second grade settling tank (29) is at one side of being close to the air intake and is installed electrified electrode (16), and the clearance between electrified electrode (16) and metal sheet (17) edge is 3 ~ 5 mm.

7. The blast furnace gas gravity dust removal system according to claim 1, wherein: and a coal tar adsorption material is arranged on the gate valve (3).