System for protecting airtight box of blast furnace by double gases

Abstract

The utility model provides a system for protecting a blast furnace airtight box by double gases. According to the system, a clean gas protection pipeline is led out from an outlet of a dry dedusting pipeline and laid to a blast furnace airtight box, and clean gas and nitrogen perform dual protection on the airtight box so that the clean gas can still protect equipment in the airtight box when an external nitrogen source breaks down. The system effectively solves the problem that a blast furnace system depends on protection of an external nitrogen source, guarantees that the airtight box is protected by clean gas when nitrogen is abnormal, maintains stable operation of the blast furnace, improves operation stability and production continuity of equipment, and meanwhile improves comprehensive utilization efficiency of energy of the whole blast furnace production system.

Description

Technical Field

[0001] This utility model relates to the technology of blast furnace top equipment, and in particular to a system for a dual-gas protection blast furnace gas-tight box. Background Technology

[0002] In the iron and steel metallurgical industry, the stable operation of the blast furnace is crucial to the entire production process. The blast furnace gas-tight box is a water-cooled gearbox mounted on the furnace top steel ring. Its main function is to achieve the vertical tilting and horizontal rotation of the charging chute through the differential rotation of the planetary reducer and the rotation of the tilting reducer, thereby ensuring uniform and reasonable charging of the blast furnace. Located at the bottom of the charging equipment, the blast furnace gas-tight box is exposed to the blast furnace temperature. Under normal circumstances, the furnace top temperature is between 200 and 350°C, but in emergency situations, the furnace top temperature can reach 600°C. The blast furnace gas-tight box has a two-stage sealing structure and is equipped with water-cooled plates to ensure that the temperature inside the gearbox remains below the allowable temperature. Simultaneously, protective nitrogen is injected into the gearbox to prevent dust from entering the cavity.

[0003] Existing blast furnace gas-tight box protection devices rely entirely on external energy. If a nitrogen source fails and the protective nitrogen supply cannot be delivered normally, high-temperature, dust-laden gas will enter the gas-tight box, causing malfunctions in the water-cooled gearbox and leading to prolonged blast furnace shutdowns and significant losses. Therefore, to address this shortcoming and problem, there is an urgent need to design a system with dual gas protection for the blast furnace gas-tight box to reduce losses caused by abnormal external energy supply. Summary of the Invention

[0004] A brief overview of the present invention is given below to provide a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the present invention. It is not intended to identify key or essential parts of the present invention, nor is it intended to limit the scope of the present invention. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0005] In view of this, in order to solve the practical problem that the airtight box is damaged by high temperature dust-containing gas when the externally supplied nitrogen cannot be delivered normally, resulting in the failure of the water-cooled gearbox, this utility model provides a system for dual gas protection of the blast furnace airtight box.

[0006] The present invention relates to a system for a dual-gas protection blast furnace gas-tight box, comprising a dry dust removal pipeline, a clean gas protection pipeline, a clean gas venting pipeline, a receiving hopper, a material tank, a gas-tight box, a blast furnace, a nitrogen pressure equalization pipeline, a nitrogen protection pipeline, and a nitrogen distribution cylinder.

[0007] The receiving hopper is connected to the airtight box via a material tank. After the furnace charge is loaded into the receiving hopper, it is stored and transferred in the material tank. The airtight box then transfers the furnace charge in the material tank to the blast furnace connected at the bottom for combustion.

[0008] The dry dust removal pipeline is connected to the clean gas protection pipeline and the clean gas venting pipeline via a tee. The clean gas is transported to the clean gas protection pipeline and the clean gas venting pipeline through the dry dust removal pipeline. The clean gas protection pipeline is connected to the air inlet on the right side of the airtight box, and the clean gas venting pipeline is connected to the air inlet on the right side of the material tank.

[0009] The nitrogen distribution cylinder has a nitrogen source connected to its left air inlet. The nitrogen distribution cylinder is connected to a nitrogen equalization pipe and a nitrogen protection pipe. The nitrogen protection pipe is connected to the left air inlet of the airtight box, and the nitrogen equalization pipe is connected to the left air inlet of the material tank.

[0010] A shut-off valve is installed on the clean coal gas protection pipeline.

[0011] Furthermore, the gas venting pipeline is equipped with a pressure equalization valve and a maintenance valve.

[0012] Furthermore, the nitrogen distribution cylinder has a volume of 10m³. 3 . Attached Figure Description

[0013] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0014] Figure 1 This is a schematic diagram of a dual-gas-protected blast furnace gas-tight box system.

[0015] In the diagram: 1-Dry dust removal pipeline, 2-Clean gas protection pipeline, 3-Clean gas venting pipeline, 4-Receiving hopper, 5-Material tank, 6-Airtight box, 7-Blast furnace top, 8-Nitrogen pressure equalization pipeline, 9-Nitrogen protection pipeline, 10-Nitrogen distribution cylinder. Detailed Implementation

[0016] To make the technical solutions and advantages of the embodiments of this utility model clearer, the exemplary embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0017] Example 1, Reference Figure 1This embodiment describes a dual-gas protection blast furnace gas-tight box system, which includes a dry dust removal pipeline 1, a clean gas protection pipeline 2, a clean gas venting pipeline 3, a receiving hopper 4, a material tank 5, a gas-tight box 6, a blast furnace 7, a nitrogen pressure equalization pipeline 8, a nitrogen protection pipeline 9, and a nitrogen distribution cylinder 10.

[0018] The receiving hopper 4 is connected to the airtight box 6 via the material tank 5. After the furnace charge is loaded into the receiving hopper 4, it is stored and transferred in the material tank 5. The airtight box 6 transfers the furnace charge in the material tank 5 to the blast furnace 7 connected at the bottom for combustion.

[0019] The dry dust removal pipeline 1 is connected to the clean gas protection pipeline 2 and the clean gas venting pipeline 3 via a tee. The clean gas is transported through the dry dust removal pipeline 1 to the clean gas protection pipeline 2 and the clean gas venting pipeline 3. The clean gas protection pipeline 2 is connected to the right air inlet of the airtight box 6, and the clean gas venting pipeline 3 is connected to the right air inlet of the material tank 5.

[0020] The nitrogen distribution cylinder 10 has a nitrogen source connected to its left air inlet. The nitrogen distribution cylinder 10 is connected to a nitrogen equalization pipe 8 and a nitrogen protection pipe 9. The nitrogen protection pipe 9 is connected to the left air inlet of the airtight box 6, and the nitrogen equalization pipe 8 is connected to the left air inlet of the material tank 5.

[0021] The airtight box 6 is equipped with a two-stage sealing structure. The nitrogen in the nitrogen protection pipe 9 further seals and cools the gas passing through the two-stage seal of the airtight box 6.

[0022] The clean coal gas protection pipeline 2 is equipped with a shut-off valve. When nitrogen cannot be delivered to the airtight box 6 normally, the shut-off valve is opened to allow the clean coal gas to further seal and cool the gas that has passed through the two-stage seal of the airtight box 6.

[0023] Furthermore, the clean gas venting pipe 3 is connected to the right side of the material tank 5 to perform the first pressure equalization of the material tank 5; the nitrogen pressure equalization pipe 8 is connected to the left side of the material tank 5 to perform the second pressure equalization of the material tank 5; the purpose of the two pressure equalizations is to balance the pressure of the material tank 5 and the furnace.

[0024] Furthermore, the gas venting pipeline 3 is equipped with a pressure equalization valve and a maintenance valve.

[0025] Furthermore, the nitrogen distribution cylinder 10 has a volume of 10m³. 3 .

[0026] This invention provides continuous and safe protection even when nitrogen supply is interrupted, preventing damage to the airtight box equipment and maintaining blast furnace production. Clean coal gas is produced by the blast furnace without external influence, thus improving the overall energy utilization efficiency of the entire blast furnace production system.

[0027] Although the present invention has been described with reference to a limited number of embodiments, those skilled in the art will understand from the foregoing description that other embodiments are conceivable within the scope of the present invention described herein. Furthermore, it should be noted that the language used in this specification has been chosen primarily for readability and edibility purposes, and not for interpreting or limiting the subject matter of the invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. Regarding the scope of the invention, the disclosure made is illustrative and not restrictive, and the scope of the invention is defined by the appended claims.

Claims

1. A system for a dual-gas protected blast furnace gas-tight box, characterized in that, Includes dry dust removal pipeline (1), clean gas protection pipeline (2), clean gas venting pipeline (3), receiving hopper (4), material tank (5), airtight box (6), blast furnace (7), nitrogen pressure equalization pipeline (8), nitrogen protection pipeline (9), and nitrogen distribution cylinder (10); The receiving hopper (4) is connected to the airtight box (6) through the material tank (5). After the furnace charge is loaded into the receiving hopper (4), it is stored and transferred in the material tank (5). The airtight box (6) transfers the furnace charge in the material tank (5) to the blast furnace (7) connected at the bottom for combustion. The dry dust removal pipeline (1) is connected to the clean gas protection pipeline (2) and the clean gas venting pipeline (3) via a tee. The clean gas is transported through the dry dust removal pipeline (1) to the clean gas protection pipeline (2) and the clean gas venting pipeline (3). The clean gas protection pipeline (2) is connected to the right air inlet of the airtight box (6), and the clean gas venting pipeline (3) is connected to the right air inlet of the material tank (5). The nitrogen distribution cylinder (10) has a nitrogen source connected to its left air inlet. The nitrogen distribution cylinder (10) is connected to a nitrogen equalization pipe (8) and a nitrogen protection pipe (9). The nitrogen protection pipe (9) is connected to the left air inlet of the airtight box (6), and the nitrogen equalization pipe (8) is connected to the left air inlet of the material tank (5). A shut-off valve is installed on the clean gas protection pipeline (2).

2. The system for a dual-gas protected blast furnace gas-tight box according to claim 1, characterized in that, The gas venting pipeline (3) is equipped with a pressure equalization valve and a maintenance valve.

3. The system for a dual-gas protected blast furnace gas-tight box according to claim 1, characterized in that, The nitrogen distribution cylinder (10) has a volume of 10m³. 3 .

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