CN111154933B

CN111154933B - Pressure equalizing device between injection tanks of blast furnace coal injection system

Info

Publication number: CN111154933B
Application number: CN202010004535.1A
Authority: CN
Inventors: 宋鹏亮; 姜诚; 潘瑞峰; 单世强; 高中兴
Original assignee: Qingdao Hengtuo Environmental Protection Technology Co ltd
Current assignee: Qingdao Hengtuo Environmental Protection Technology Co ltd
Priority date: 2020-01-03
Filing date: 2020-01-03
Publication date: 2021-06-08
Anticipated expiration: 2040-01-03
Also published as: CN111154933A

Abstract

The invention relates to the field of metallurgical industry, in particular to a pressure equalizing device between injection tanks of a blast furnace coal injection system, which comprises a pressure equalizing tank, impellers, a guide plate, nozzles and a first rotating shaft, wherein one end of the first rotating shaft is rotationally arranged in the middle of the upper part of an inner cavity of the pressure equalizing tank through a first bearing, the other end of the first rotating shaft is vertically provided with the impellers, the two guide plates are arranged at the top of the inner cavity of the pressure equalizing tank and positioned at two sides of the impellers, and the nozzles form an upper nozzle group and a lower nozzle group. The initial pressure in the tank body which is not blown is increased, the required secondary supplement pressure is reduced, and the method is suitable for wide popularization.

Description

Pressure equalizing device between injection tanks of blast furnace coal injection system

Technical Field

The invention relates to the field of metallurgical industry, in particular to a pressure equalizing device between injection tanks of a blast furnace coal injection system.

Background

A coal injection link is a necessary link in the production process of most metallurgical enterprises, at present, the coal injection of a blast furnace in China is mainly realized by double-tank parallel injection, pulverized coal is pressed out of a tank body in a mode of pressurizing the tank body and is sent into the blast furnace through a distributor, after the coal injection of one tank body is completed, the coal injection needs to be switched to another tank body for coal injection, the original tank body is subjected to pressure relief and powder loading, the two tank bodies are named as an A tank and a B tank respectively, the pressure in the tank body needs to be continuously pressurized in the coal injection process of the A tank, the pressure in the tank needs to be completely dispersed after the coal injection is completed, the powder can be reloaded, however, the pulverized coal needs to be re-pressurized to be injected in the coal injection process of the B tank, and a large amount of energy is wasted. If pressure equalizing is carried out by simply adopting a mode of assembling the valve through the communicating pipeline, a large amount of pulverized coal enters the pressure equalizing pipeline in the pressure equalizing process, so that the valve can not be opened or closed frequently.

Disclosure of Invention

The pressure equalizing device between the injection tanks of the blast furnace coal injection system can convey the air pressure in the injected tank body to another tank body which is not injected, greatly reduces the coal dust remained in the pipeline and solves the problems.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a pressure-equalizing device between blast furnace coal injection system jetting jar, includes pressure-equalizing jar, impeller, guide plate, nozzle and first pivot, first pivot one end is rotated through first bearing and is set up in the middle of pressure-equalizing jar inner chamber upper portion, the other end is provided with the impeller perpendicularly, the guide plate is total two, all sets up pressure-equalizing jar inner chamber top is located the impeller both sides, nozzle group and lower nozzle group are constituteed to the nozzle, the nozzle of going up nozzle group and lower nozzle group all runs through perpendicularly the guide plate, the nozzle front end orientation of going up nozzle group the pressure-equalizing jar inner chamber, the nozzle of nozzle group down with the reverse setting of nozzle of going up nozzle group, pressure-equalizing jar left side intercommunication has first pressure pipe, and the right side intercommunication has the second pressure pipe.

Preferably, a first pressure sensor, a first pneumatic ball valve and a first manual ball valve are sequentially arranged on the first pressure pipe from left to right.

Preferably, a second pressure sensor, a second pneumatic ball valve and a second manual ball valve are sequentially arranged on the second pressure pipe from right to left.

Preferably, still include the reduction gear, the reduction gear includes second bearing, third bearing, a gear wheel and a pinion, the pinion is fixed to be set up in the first pivot, second bearing and third bearing all cup joint in the first pivot and lie in the pinion both sides, all be provided with first swing arm on second bearing and the third bearing outer wall, rotate through the fourth bearing between two first swing arm free ends and be provided with the second pivot, the gear wheel sets up in the middle of the second pivot and with the pinion meshes mutually, second pivot both ends all are provided with the second swing arm, the second swing arm is provided with the impeller perpendicularly.

Preferably, the gear ratio of the large gear to the small gear is 1: 2.

preferably, the nozzle diameter is gradually reduced from the tip end to the front end, so that the gas is compressed, thereby increasing the gas flow velocity, and the nozzle has a tip end diameter of 8mm and a front end diameter of 3 mm.

Preferably, the front wall of the impeller is in a convex arc shape, and the top surface, the rear wall and the bottom surface are in concave arc shapes.

Preferably, the impeller is in the shape of a fin with a fish back, the top end of the tail of the impeller is provided with a deashing scraper, and the impeller is made of 7075 aviation aluminum or TC4 titanium alloy.

Preferably, the pressure equalizing tank is T-shaped, the bottom of the pressure equalizing tank is communicated with a powder bin pipe, and a third pneumatic ball valve and a third manual ball valve are arranged on the powder bin pipe.

Preferably, the upper nozzle group is arranged at the upper end of the guide plate, and the lower nozzle group is arranged at the lower end of the upper nozzle group and is positioned in the middle of the guide plate.

The invention has the beneficial effects that:

1. the left side of the pressure equalizing tank is communicated with a first pressure pipe, the right side of the pressure equalizing tank is communicated with a second pressure pipe, the other ends of the first pressure pipe and the second pressure pipe are respectively communicated with two coal injection tank bodies, and the first pressure pipe and the second pressure pipe are respectively provided with a pressure sensor and a pneumatic ball valve, so that the air pressure in the injected tank body can be conveyed to another non-injected tank body, the initial pressure in the non-injected tank body is increased, and the required secondary supplement pressure is reduced.

2. The left and right back fin-shaped impellers increase airflow guiding force and stress area, increase autorotation capacity through self gravity distribution, all concave areas in the impellers can be used as retention areas of coal dust carried in the airflow, the coal dust descends to a coal outlet through gravity when any concave surface is vertical or downward along with the rotation of the impellers, the coal dust is automatically discharged after pressure equalization is completed, in addition, the top end of the tail part of the impeller is provided with a scraper blade, and the ash removal attached to the pipe wall of an airflow hole can be automatically scraped and cleaned when the impellers rotate.

3. Because of the instability of air flow in the pressure equalizing process, in order to avoid the phenomenon that the impeller throws away the coal powder when the flow rate is too high in the initial stage, a speed reducer is arranged according to the 1/2 reduction ratio, and the speed reduction is finished through the tooth number of the big gear and the small gear.

4. For letting the better promotion impeller action of air current, the nozzle is gaseous acceleration part, will pass through the air current and become to 3mm by 1.5cm diminishing through the bore, thereby form acceleration process, the first half of guide plate corresponds the biggest contained angle department of impeller top windage, the better promotion impeller rotation of gas after the utilization accelerates, the guide plate lower half is the air current deceleration effect, the gas bore is gone out by 3mm grow to 1.5cm in the reduction of speed of the same reason, make the flow property reduce, thereby the air current when will passing through the impeller is cut apart.

Drawings

Fig. 1 is a schematic structural diagram of the pressure equalizing tank of the invention.

Fig. 2 is a schematic view of the baffle installation of the present invention.

Fig. 3 is a schematic view of the impeller structure of the present invention.

Fig. 4 is a longitudinal sectional view of the impeller of the present invention.

Fig. 5 is a schematic view of a baffle configuration of the present invention.

FIG. 6 is a schematic view of a nozzle structure according to the present invention.

Fig. 7 is a schematic view of the reducer of the present invention.

Fig. 8 is an assembly overview of the present invention.

In the figure: 1-pressure equalizing tank, 2-impeller, 3-guide plate, 4-speed reducer, 5-first pressure sensor, 6-second pressure sensor, 7-first pneumatic ball valve, 8-second pneumatic ball valve, 9-first manual ball valve, 10-second manual ball valve, 11-third pneumatic ball valve, 12-first manual ball valve, 13-powder bin pipe, 14-first bearing, 15-first rotating shaft, first pressure pipe 16, second pressure pipe 17, 31-nozzle, 41-second bearing, 42-pinion, 43-third bearing, 44-first swing arm, 45-fourth bearing, 46-second rotating shaft, 47-second swing arm and 48-bull gear.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-8, a pressure equalizing device between blast furnace coal injection system jetting jar includes pressure equalizing jar 1, impeller 2, guide plate 3, nozzle 31, reduction gear 4 and first pivot 15, and first pivot 15 one end rotates through first bearing 14 and sets up in the middle of pressure equalizing jar 1 inner chamber upper portion, and reduction gear 4, reduction gear 4 include second bearing 41, third bearing 43, a gear wheel 48 and a pinion 42, and the gear ratio of gear wheel 48 and pinion 42 is 1: 2, the large gear 48 rotates for one circle and the small gear 42 rotates for half a circle, and the reduction is completed by increasing the resistance through the tooth number of the large gear and the small gear and the reduction bearings at the two ends. Pinion 42 is fixed to be set up on first pivot 15, and second bearing 41 and third bearing 43 all cup joint on first pivot 15 and are located pinion 42 both sides, all are provided with first arm 44 on second bearing 41 and the third bearing 43 outer wall, rotate through fourth bearing 45 between two first swing arm 44 free ends and are provided with second pivot 46, gear wheel 48 sets up in the middle of second pivot 46 and meshes mutually with pinion 42, and second pivot 46 both ends all are provided with second swing arm 47, and second swing arm 47 is provided with impeller 2 perpendicularly. The impeller material is 7075 aviation aluminium, 2 antethecas of impeller are convex arc, the top surface, back wall and bottom surface are concave arc's fish back fin-shaped, and then increase air current guiding force and atress area, increase the rotation ability through self gravity distribution, all concave type regions in the impeller all can regard as the stay region of the buggy that carries in the air current, along with the impeller rotates, when any one concave surface is perpendicular or downward, the buggy will descend to coal mouthful through gravity, wait to accomplish the automatic elimination after the voltage-sharing, impeller afterbody top can scrape the clearance automatically when rotating and be stained with the powder that attaches in air current hole pipe wall department for deashing scraper blade impeller afterbody. The guide plates 3 are two in number, are arranged at the top of the inner cavity of the pressure equalizing tank 1 and are positioned at two sides of the impeller 2. The diameter of the nozzle 31 is gradually reduced from the tail end to the front end, and the tail end of the nozzle 31 has the same diameter. 1.5cm, the tip diameter is 3 mm. The air current is from the terminal flow direction front end of nozzle 31 and is accomplished accelerating, the air current is from the terminal flow direction terminal completion of nozzle 31 and is slowed down, nozzle group and lower nozzle group are constituteed to nozzle 31, go up nozzle group and nozzle 31 of nozzle group down and all run through guide plate 3 perpendicularly, the nozzle 31 front end of going up nozzle group is towards 1 inner chamber of pressure-equalizing tank, nozzle 31 of nozzle group and the reverse setting of nozzle 31 of last nozzle group down, it sets up in 3 upper ends of guide plate to go up nozzle group, lower nozzle group sets up at last nozzle group lower extreme and is located guide plate 3 middle parts. The left side of the pressure equalizing tank 1 is communicated with a first pressure pipe 16, and the right side of the pressure equalizing tank is communicated with a second pressure pipe 17. The first pressure sensor 5, the first pneumatic ball valve 7 and the first manual ball valve 9 are sequentially arranged on the first pressure pipe 16 from left to right. The second pressure sensor 6, the second pneumatic ball valve 8 and the second manual ball valve 10 are sequentially arranged on the second pressure pipe 17 from right to left. The pressure equalizing tank 1 is T-shaped, the bottom of the pressure equalizing tank 1 is communicated with a powder bin pipe 13, and the other end of the powder bin pipe 13 is connected with a powder bin for recycling coal ash. And a third pneumatic ball valve 11 and a third manual ball valve 12 are arranged on the powder bin pipe 13, and the manual ball valves are normally open and are closed during maintenance.

The working principle is as follows:

the invention is respectively communicated with a left pulverized coal tank and a right pulverized coal tank through a first pressure pipe 16 and a second pressure pipe 17, when the right pulverized coal tank finishes coal injection, a first pneumatic ball valve 7 and a second pneumatic ball valve 8 are controlled to be opened, the air pressure in the right pulverized coal tank is blown to an impeller 2 along the second pressure pipe 17 through a nozzle group at the top of a right guide plate 3 in an accelerating way, all concave areas in the impeller 2 can be used as staying areas of pulverized coal carried in air flow, along with the rotation of the impeller 2, when any concave surface is vertical or downward, the pulverized coal falls to the bottom of a pressure equalizing tank 1 through gravity, the impeller 2 is arranged on a speed reducer, a large gear 48 rotates for one circle, a small gear 42 rotates for half a circle, the speed reducing effect is achieved, the pulverized coal is prevented from being thrown out by the impeller 2 when the flow speed is too fast in the initial stage, the air flow enters the left pulverized coal tank through the first, when the first pressure sensor 5 and the second pressure sensor 6 detect that the pressure values in the left pulverized coal tank and the right pulverized coal tank are less than 0.1Kpa, the first pneumatic ball valve 7 and the second pneumatic ball valve 8 are automatically closed, then the third pneumatic ball valve 11 at the lower end is opened to discharge ash, and pressure equalization is further completed. After the coal powder tank on the left side finishes coal injection, the working principle is the same as that after the coal powder tank on the right side finishes coal injection, and the method is simple and efficient.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides a pressure-equalizing device between blast furnace coal injection system jetting jar which characterized in that: comprises a pressure equalizing tank (1), an impeller (2), a guide plate (3), a nozzle (31) and a first rotating shaft (15), wherein one end of the first rotating shaft (15) is rotatably arranged in the middle of the upper part of an inner cavity of the pressure equalizing tank (1) through a first bearing (14), the other end of the first rotating shaft is vertically provided with the impeller (2), the guide plate (3) is totally two, the guide plate (3) is arranged at the top of the inner cavity of the pressure equalizing tank (1) and positioned at two sides of the impeller (2), an upper nozzle group and a lower nozzle group are formed by the nozzle (31), the nozzles (31) of the upper nozzle group and the lower nozzle group vertically penetrate through the guide plate (3), the front end of the nozzle (31) of the upper nozzle group faces towards the inner cavity of the pressure equalizing tank (1), the nozzle (31) of the lower nozzle group is reversely arranged with the nozzle (31) of the upper nozzle group, the left side of the, the right side is communicated with a second pressure pipe (17).

2. The pressure equalizing device between the injection tanks of the blast furnace coal injection system according to claim 1, characterized in that: a first pressure sensor (5), a first pneumatic ball valve (7) and a first manual ball valve (9) are sequentially arranged on the first pressure pipe (16) from left to right.

3. The pressure equalizing device between the injection tanks of the blast furnace coal injection system according to claim 1, characterized in that: and a second pressure sensor (6), a second pneumatic ball valve (8) and a second manual ball valve (10) are sequentially arranged on the second pressure pipe (17) from right to left.

4. The pressure equalizing device between the injection tanks of the blast furnace coal injection system according to claim 1, characterized in that: also comprises a speed reducer (4), wherein the speed reducer (4) comprises a second bearing (41), a third bearing (43), a large gear (48) and a small gear (42), the pinion (42) is fixedly arranged on the first rotating shaft (15), the second bearing (41) and the third bearing (43) are sleeved on the first rotating shaft (15) and positioned on two sides of the pinion (42), the outer walls of the second bearing (41) and the third bearing (43) are respectively provided with a first swing arm (44), a second rotating shaft (46) is rotatably arranged between the free ends of the two first swing arms (44) through a fourth bearing (45), the big gear (48) is arranged in the middle of the second rotating shaft (46) and is meshed with the small gear (42), and second swing arms (47) are arranged at two ends of the second rotating shaft (46), and impellers (2) are vertically arranged on the second swing arms (47).

5. The pressure equalizing device between the injection tanks of the blast furnace coal injection system according to claim 4, characterized in that: the gear ratio of the large gear (48) to the small gear (42) is 1: 2.

6. the pressure equalizing device between the injection tanks of the blast furnace coal injection system according to claim 1, characterized in that: the diameter of the nozzle (31) is gradually reduced from the tail end to the front end, so that the gas is compressed, and the gas flow speed is increased, wherein the tail end diameter of the nozzle (31) is 1.5cm, and the front end diameter of the nozzle is 3 mm.

7. The pressure equalizing device between the injection tanks of the blast furnace coal injection system according to claim 1, characterized in that: the front wall of the impeller (2) is in a convex arc shape, and the top surface, the rear wall and the bottom surface are in a concave arc shape.

8. The pressure equalizing device between the injection tanks of the blast furnace coal injection system according to claim 1, characterized in that: the impeller (2) is in the shape of a fin with a fish back, the top end of the tail of the impeller (2) is provided with an ash removal scraper, and the impeller (2) is made of high-strength light alloy such as 7075 aviation aluminum, T10 carbon or TC4 titanium alloy.

9. The pressure equalizing device between the injection tanks of the blast furnace coal injection system according to claim 1, characterized in that: the powder bin pressure equalizing device is characterized in that the pressure equalizing tank (1) is T-shaped, the bottom of the pressure equalizing tank (1) is communicated with a powder bin pipe (13), and a third pneumatic ball valve (11) and a third manual ball valve (12) are arranged on the powder bin pipe (13).

10. The pressure equalizing device between the injection tanks of the blast furnace coal injection system according to claim 1, characterized in that: the upper nozzle group is arranged at the upper end of the guide plate (3), and the lower nozzle group is arranged at the lower end of the upper nozzle group and is positioned in the middle of the guide plate (3).