CN-224212682-U - Blast furnace tank pressure equalizing system convenient for overhauling pressure equalizing gas pipeline

CN224212682UCN 224212682 UCN224212682 UCN 224212682UCN-224212682-U

Abstract

The utility model discloses a blast furnace burden tank pressure equalizing system convenient for overhauling a pressure equalizing gas pipeline, which comprises a clean gas pipeline, a pressure equalizing gas pipeline, a charging tank connecting pipe and a charging tank which are sequentially communicated, wherein a first sealing stop valve is arranged on the clean gas pipeline, a nitrogen purging pipeline is connected to the pressure equalizing gas pipeline, a nitrogen purging valve is arranged on the nitrogen purging pipeline, a first relief valve is also connected to the pressure equalizing gas pipeline, a second sealing stop valve, a pressure equalizing valve and a charging tank valve are arranged on the charging tank connecting pipe, a section of charging tank connecting pipe between the pressure equalizing valve and the charging tank valve is also communicated with a relief pipe, a second relief valve is arranged on the relief pipe, a pressure equalizing nitrogen pipeline is also connected to the section of charging tank connecting pipe, a nitrogen stop valve is arranged on the pressure equalizing nitrogen pipeline, and a material flow valve and a lower sealing valve are arranged on a bottom discharging pipe of the charging tank. The pressure equalizing system can effectively solve the problem of gas leakage without stopping production, and reduce nitrogen consumption as much as possible.

Inventors

ZHANG XIAOCHEN
GUO WEI
HUANG DENGPING
Qiu Daoqin
HUANG HUICHENG
LI ZHICHUAN

Assignees

福建罗源闽光钢铁有限责任公司

Dates

Publication Date: 20260508
Application Date: 20250522

Claims (7)

1. A blast furnace material tank pressure equalizing system convenient for overhauling a pressure equalizing gas pipeline comprises a clean gas pipeline, a pressure equalizing gas pipeline, a material tank connecting pipe and a material tank which are sequentially communicated; the device is characterized in that a nitrogen purging pipeline is connected to the pressure equalizing gas pipeline, a nitrogen purging valve is arranged on the nitrogen purging pipeline, a first discharging valve is further connected to the pressure equalizing gas pipeline, a second sealing stop valve, a pressure equalizing valve and a tank inlet valve are sequentially arranged on the tank connecting pipe along the direction from the pressure equalizing gas pipeline to the tank, a section of tank connecting pipe between the pressure equalizing valve and the tank inlet valve is further communicated with a discharging pipe, a second discharging valve is arranged on the discharging pipe, a pressure equalizing nitrogen pipeline is further connected to the section of tank connecting pipe, a nitrogen stopping valve is arranged on the pressure equalizing nitrogen pipeline, and a material flow valve and a lower sealing valve are arranged on a bottom discharging pipe of the tank.
2. The pressure equalizing system for blast furnace burden tank for conveniently overhauling pressure equalizing gas pipeline according to claim 1, wherein a plurality of gas alarms are arranged around the pressure equalizing gas pipeline and used for sending out alarm signals when the concentration of carbon monoxide is monitored to be less than 24 ppm.
3. The pressure equalizing system for blast furnace burden tank for conveniently overhauling pressure equalizing gas pipeline according to claim 1, wherein the number of the charging tank connecting pipes is two, the initial ends of the charging tank connecting pipes are commonly connected with the tail end of the pressure equalizing gas pipeline, and the tail ends of the charging tank connecting pipes are respectively connected with the left side and the right side of the charging tank.
4. The blast furnace burden tank pressure equalizing system for conveniently overhauling pressure equalizing gas pipelines according to claim 3, wherein the main pipe of the pressure equalizing nitrogen pipeline is respectively communicated with the two tank connecting pipes through two branch pipes, and the two branch pipes are respectively provided with the nitrogen shut-off valve.
5. The blast furnace tank pressure equalizing system for conveniently overhauling a pressure equalizing gas pipeline according to claim 1, wherein the first sealing and cutting valve is formed by combining two valves.
6. The blast furnace tank pressure equalizing system for conveniently overhauling a pressure equalizing gas pipeline according to claim 1, wherein the second sealing and cutting valve is formed by combining two valves.
7. The blast furnace burden tank pressure equalizing system for conveniently overhauling a pressure equalizing gas pipeline according to claim 1, wherein the charging tank connecting pipe is further connected with a gas recovery tank body through a gas recovery pipeline, and a recovery valve and a recovery cut-off valve are arranged on the gas recovery pipeline.

Description

Blast furnace tank pressure equalizing system convenient for overhauling pressure equalizing gas pipeline Technical Field The utility model relates to the field of blast furnace smelting equipment, in particular to a blast furnace tank pressure equalizing system convenient for overhauling a pressure equalizing gas pipeline. Background The design range of the pressure of the blast furnace top is 0.12-0.25 MPa (gauge pressure). During normal production, the pressure in the furnace is far higher than the atmospheric pressure. In order to ensure that the furnace burden smoothly enters the furnace, the pressure of the charging bucket is basically equal to the pressure in the furnace. For this purpose, the tanks are usually pressurized with gas or nitrogen equalization. For the uniformity of the gas, the high-pressure gas contains corrosive gases such as sulfides, halides and the like, so that the pressure equalizing pipeline is easy to break holes and leak gas, the production safety is affected, and the pressure equalizing effect is poor due to the gas leakage. In the pressure equalizing process of the blast furnace tank, once the pressure equalizing gas pipeline is found to have a hole for gas leakage, the gas source is usually stopped immediately and cut off, and a valve near a leakage point is closed. Since the blast furnace is a continuous production facility, the problems associated with the shut down process can result in significant waste. For nitrogen pressure equalizing, nitrogen is an inert gas, and is not combusted and combustion-supporting, so that the risk of fire or explosion caused by gas leakage can be effectively reduced by using the nitrogen pressure equalizing. But the cost of nitrogen is higher than that of coal gas, if nitrogen pressure equalizing is relied on for a long time, the nitrogen consumption is greatly increased, and the production cost is further increased. Therefore, there is an urgent need to develop a pressure equalizing scheme that can effectively solve the leakage problem and minimize the nitrogen consumption without stopping production when the pressure equalizing gas pipeline of the blast furnace tank is broken and leaked. Disclosure of utility model The utility model aims to provide a blast furnace tank pressure equalizing system which is convenient for overhauling a pressure equalizing gas pipeline, and can control the relevant valve to leak repairing the pressure equalizing gas pipeline to avoid production stopping, and meanwhile, the relevant valve can be controlled to flexibly switch between gas pressure equalizing and nitrogen pressure equalizing, thereby being beneficial to shortening the time of nitrogen pressure equalizing and saving the cost. The blast furnace burden tank pressure equalizing system comprises a clean gas pipeline, a pressure equalizing gas pipeline, a charging tank connecting pipe and a charging tank which are sequentially communicated, wherein a first sealing shut-off valve is arranged on the clean gas pipeline, a nitrogen purging pipeline is connected to the pressure equalizing gas pipeline, a nitrogen purging valve is arranged on the nitrogen purging pipeline, a first diffusing valve is further connected to the pressure equalizing gas pipeline, a second sealing shut-off valve, a pressure equalizing valve and a charging tank valve are sequentially arranged on the charging tank connecting pipe along the direction from the pressure equalizing gas pipeline to the charging tank, a section of charging tank connecting pipe between the pressure equalizing valve and the charging tank valve is also communicated with a diffusing pipe, a second diffusing valve is arranged on the diffusing pipe, a pressure equalizing nitrogen pipeline is further connected to the section of charging tank connecting pipe, a nitrogen shut-off valve is arranged on the pressure equalizing nitrogen pipeline, and a material flow valve and a lower sealing valve are arranged on a bottom discharging pipe of the charging tank. The blast furnace tank pressure equalizing system can safely leak repairing and equalizing a gas pipeline under the condition of no production stopping by adjusting and controlling the related valve, so that the problem of gas leakage is solved, meanwhile, flexible switching between gas pressure equalizing and nitrogen pressure equalizing can be realized by adjusting and controlling the related valve, the time for using nitrogen pressure equalizing can be shortened as much as possible, and the consumption caused by nitrogen pressure equalizing is reduced. Further, a plurality of gas alarms are arranged around the pressure equalizing gas pipeline and are used for sending out alarm signals when the concentration of carbon monoxide is monitored to be less than 24 ppm. The charging bucket connecting pipes are preferably two, the starting ends of the two charging bucket connecting pipes are commonly connected to the tail ends of the pressure equalizing gas pipeline, a