Distance-adjustable and diameter-adjustable blast furnace diffused gas injection device

Abstract

The utility model discloses a distance-adjustable and diameter-adjustable blast furnace diffused gas injection device, which relates to the technical field of blast furnace diffused gas recovery and comprises a receiving chamber, a throat pipe, a diffuser pipe, an injection pipe, a nozzle, a blast furnace diffused gas pipe, a blast furnace diffused gas recovery pipe, a high-pressure clean gas pipe and a manhole. An inlet of the receiving chamber is connected with a blast furnace diffusion gas pipe, and an outlet is connected with a diffuser pipe through a throat pipe; the diffuser pipe is communicated with a blast furnace diffused gas recovery pipe; the injection pipe is arranged in the receiving chamber, an inlet of the injection pipe is connected with the high-pressure clean gas pipe, and the tail end of the injection pipe is connected with the nozzle; and the access hole is formed in the receiving chamber. The utility model can solve the problems that the ejector in the prior art cannot adjust the throat distance, cannot adjust the aperture of the nozzle, cannot change the pressure-equalizing gas recovery time to meet different furnace material distribution time requirements, and further affects the pressure-equalizing gas recovery efficiency, and the ejector pipe and the nozzle are scoured by internal and external airflow for a long time; the nozzle of a conventional gas ejector cannot be replaced, and the abrasion of the pipe wall cannot be checked.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace blow-off gas recovery in the metallurgical industry, in particular to a blast furnace blow-off gas ejector device. Background Art

[0002] At present, blast furnaces in iron-making plants mostly choose blast furnace gas equalization to open the seal valve during the operation of the bunker. To prevent problems such as incomplete recovery of equalization gas and affecting the charging time, a gas ejector is mostly used to accelerate the recovery speed of equalization gas. However, the conventional gas ejector has the following deficiencies:

[0003] 1. Parameters are not adjustable: The conventional gas ejector has a non-adjustable throat nozzle distance and a non-adjustable nozzle diameter, and cannot change the equalization gas recovery time to meet the charging time requirements of different furnaces, thereby affecting the equalization gas recovery efficiency.

[0004] 2. High maintenance difficulty: The ejector pipe and nozzle are eroded by internal and external airflows for a long time, and the conventional gas ejector cannot replace the nozzle and check the wear of the pipe wall. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide an adjustable-distance and adjustable-diameter blast furnace blow-off gas ejector device, which can solve the problems existing in the prior art that the ejector has a non-adjustable throat nozzle distance and a non-adjustable nozzle diameter, cannot change the equalization gas recovery time to meet the charging time requirements of different furnaces, thereby affecting the equalization gas recovery efficiency, and that the ejector pipe and nozzle are eroded by internal and external airflows for a long time, and the conventional gas ejector cannot replace the nozzle and check the wear of the pipe wall.

[0006] To solve the above problems, the technical solution of the utility model is: This adjustable-distance and adjustable-diameter blast furnace blow-off gas ejector device includes a receiving chamber, a throat pipe, a diffuser pipe, an ejector pipe, a nozzle, a blast furnace blow-off gas pipe, a blast furnace blow-off gas recovery pipe, a high-pressure clean gas pipe, and a maintenance hole.

[0007] The inlet of the receiving chamber is connected to the blast furnace blow-off gas pipe, and the outlet is connected to the diffuser pipe through the throat pipe; the diffuser pipe is connected to the blast furnace blow-off gas recovery pipe; the ejector pipe is arranged in the receiving chamber, the inlet of the ejector pipe is connected to the high-pressure clean gas pipe, and the end of the ejector pipe is connected to the nozzle; the maintenance hole is opened on the receiving chamber corresponding to the nozzle, and nozzles with different lengths and diameters can be replaced through the maintenance hole to realize adjustable throat nozzle distance and diameter.

[0008] In the above technical solution, a more specific solution is: A nitrogen gas pipe is arranged on the high-pressure clean gas pipe connected to the inlet end of the ejector pipe, and the nitrogen gas pipe is used to introduce nitrogen gas as the ejector gas source to improve the ejector efficiency.

[0009] Furthermore: A flange cover is arranged on the maintenance hole.

[0010] Further: The ejector pipe is connected to the front part of the nozzle by screw threads.

[0011] Further: At the connection between the ejector pipe and the nozzle, the connection part of the ejector pipe has external screw threads, and the connection part of the nozzle has internal screw threads.

[0012] Further: The nozzle is coaxial with the throat pipe and the diffuser pipe.

[0013] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0014] 1. Short recovery time and high efficiency: By adjusting the throat-nozzle distance and the nozzle diameter, the utility model can accurately adjust the equalizing pressure recovery gas time according to the blast furnace burdening time, and the ejector gas source can use nitrogen to improve the ejector efficiency, realizing the full recovery of equalizing pressure gas without affecting the blast furnace burdening, and improving the recovery utilization rate of blast furnace gas.

[0015] 2. Simple structure and convenient maintenance: Through the external inspection hole and the internal screw thread connection form, the nozzle of the utility model is detachable and replaceable, reducing the later maintenance cost of the ejector and increasing the service life of the ejector.

[0016] 3. The utility model compresses the equalizing pressure relief recovery time from 10 s to 5 s and realizes the full recovery of the remaining 50 kPa equalizing pressure; Calculated based on a 45 m 3 material tank discharging 340 times a day, about 850,000 yuan can be saved annually. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the internal structure of the utility model;

[0018] Figure 2 is a schematic diagram of the overall structure of the utility model;

[0019] Figure 3 is a schematic diagram of a partial enlarged view of the ejector pipe and the nozzle in the utility model.

[0020] The reference numerals in the drawings are shown as: 1, receiving chamber; 2, throat pipe; 3, diffuser pipe; 4, ejector pipe; 5, nozzle; 6, blast furnace relief gas pipe; 7, blast furnace relief gas recovery pipe; 8, high-pressure clean gas pipe; 9, nitrogen gas pipe; 10, inspection hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following further describes the utility model in conjunction with the drawings and embodiments:

[0022] Figure 1 and Figure 2The adjustable distance and diameter blast furnace gas ejection device includes a receiving chamber 1, a throat pipe 2, a diffuser pipe 3, an ejection pipe 4, a nozzle 5, a blast furnace gas discharge pipe 6, a blast furnace gas recovery pipe 7, a high-pressure clean gas pipe 8, a nitrogen gas pipe 9 and a maintenance hole 10.

[0023] The inlet of the receiving chamber 1 is connected to the blast furnace gas discharge pipe 6, and the outlet is connected to the diffuser pipe 3 through the throat pipe 2; the diffuser pipe 3 is connected to the blast furnace gas recovery pipe 7. An ejection pipe 4 is provided in the receiving chamber 1. The inlet of the ejection pipe 4 is connected to the high-pressure clean gas pipe 8 and the standby nitrogen gas pipe 9. The end of the ejection pipe 4 is provided with a nozzle 5. As Figure 3 shown, the ejection pipe 4 and the front part of the nozzle 5 are connected by screw threads. The ejection pipe 4 has external screw threads at the connection, and the nozzle 5 has internal screw threads; the nozzle 5 is coaxial with the throat pipe 2 and the diffuser pipe 3.

[0024] A maintenance hole 10 is provided on the receiving chamber 1 corresponding to the nozzle 5, and a flange cover is provided on the maintenance hole 10; when performing maintenance, the flange cover is opened, and nozzles of different lengths and diameters can be replaced through the maintenance hole 10 to realize the adjustable throat-nozzle distance and diameter.

[0025] The nitrogen gas pipe provided on the high-pressure clean gas pipe 8 connected to the inlet end of the ejection pipe 4 can introduce nitrogen gas as the ejection gas source to improve the ejection efficiency.

Claims

1. An adjustable-distance and adjustable-diameter blast furnace gas relief ejector device, characterized in that: It includes a receiving chamber (1), a throat pipe (2), a diffuser pipe (3), an ejector pipe (4), a nozzle (5), a blast furnace gas blow-off pipe (6), a blast furnace gas blow-off recovery pipe (7), a high-pressure clean coal gas pipe (8) and a maintenance hole (10); The inlet of the receiving chamber (1) is connected to the blast furnace gas blow-off pipe (6), and the outlet of the receiving chamber (1) is connected to the diffuser pipe (3) through the throat pipe (2); the diffuser pipe (3) is communicated with the blast furnace gas blow-off recovery pipe (7); the ejector pipe (4) is arranged in the receiving chamber (1), the inlet of the ejector pipe (4) is connected to the high-pressure clean coal gas pipe (8), and the end of the ejector pipe (4) is connected to the nozzle (5); the maintenance hole (10) is opened on the receiving chamber (1).

2. The adjustable-distance and adjustable-diameter blast furnace gas discharge and ejecting device according to claim 1, characterized in that: A nitrogen gas pipe (9) is arranged on the high-pressure clean coal gas pipe (8) connected to the inlet end of the ejector pipe (4).

3. The adjustable-distance and adjustable-diameter blast furnace gas discharge and ejecting device according to claim 1 or 2, characterized in that: A flange cover is arranged on the maintenance hole (10).

4. The adjustable-distance and adjustable-diameter blast furnace gas discharge and ejecting device according to claim 3, characterized in that: The ejector pipe (4) and the nozzle (5) are connected by screw threads.

5. The adjustable-distance and adjustable-diameter blast furnace gas discharge ejector device according to claim 4, characterized in that: At the connection of the ejector pipe (4) and the nozzle (5), the connection part of the ejector pipe (4) is an external screw thread, and the connection part of the nozzle (5) is an internal screw thread.

6. The adjustable-distance and adjustable-diameter blast furnace gas emission ejector device according to claim 5, characterized in that: The nozzle (5) is coaxial with the throat pipe (2) and the diffuser pipe (3).

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