CN-121975984-A - Hot-blast stove nitrogen purging system and purging method

CN121975984ACN 121975984 ACN121975984 ACN 121975984ACN-121975984-A

Abstract

The application discloses a nitrogen purging system and a purging method for a hot blast stove, wherein the nitrogen purging system for the hot blast stove comprises a nitrogen main pipe, purging subsystems, flow monitoring devices and pressure detection systems, the number of the purging subsystems is the same as that of the hot blast stove, the purging subsystems are communicated with corresponding nitrogen connecting holes, the purging subsystems comprise nitrogen branches and nitrogen valve groups, the nitrogen branches are communicated with second short sections, the nitrogen branches and the second short sections are arranged at an angle, the flow monitoring devices are arranged on the nitrogen branches and are located at the upstream of the nitrogen valve groups, and the pressure detection systems are arranged on the nitrogen main pipe and are located at the upstream of the purging subsystems. The gas in the first short section between the gas combustion valve and the hot blast stove body and the residual gas in the second short section between the gas combustion valve and the gas cut-off valve can be purged and replaced, and the guarantee is provided for the efficient, stable and safe operation of the hot blast stove.

Inventors

LI BAOJUN
SONG YUNSHAN
LIU BIN
FENG WEI
XUE LIZHENG
CHENG HONGQUAN
LUO DEQING
LI WEI

Assignees

北京首钢股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (10)

1. The utility model provides a hot-blast furnace nitrogen gas sweeps system, its characterized in that, the hot-blast furnace is equipped with first nipple joint, second nipple joint, the third nipple joint of intercommunication and locates gas combustion valve between first nipple joint with between the second nipple joint and locate the second nipple joint with between the third nipple joint gas shut-off valve, first nipple joint with the hot-blast furnace intercommunication, hot-blast furnace nitrogen gas sweeps system with second nipple joint intercommunication, hot-blast furnace nitrogen gas sweeps system includes: The nitrogen main pipe is provided with nitrogen connecting holes the same as the hot blast stove in number; The purging subsystem is communicated with the corresponding nitrogen connecting holes, comprises a nitrogen branch and a nitrogen valve group arranged on the nitrogen branch, wherein the nitrogen branch is used for being communicated with the second nipple, and the nitrogen branch and the second nipple are arranged at an angle; The flow monitoring device is arranged on the nitrogen branch and is positioned at the upstream of the nitrogen valve group; And the pressure detection system is arranged on the nitrogen main pipe and is positioned at the upstream of the purging subsystem.
2. The hot blast stove nitrogen purging system as claimed in claim 1, wherein two ends of the nitrogen branch are respectively welded with the second nipple and the nitrogen main pipe, and a welding point of the nitrogen branch and the second nipple is located below an axis of the second nipple.
3. The hot blast stove nitrogen purging system according to claim 1, characterized in that the nitrogen branch comprises a first nitrogen pipe and a second nitrogen pipe which are arranged at an angle and are sequentially connected and communicated, the first nitrogen pipe is connected with the second nipple, and the first nitrogen pipe is arranged along the radial direction of the second nipple; The second nitrogen pipe is connected and communicated with the nitrogen header pipe.
4. A stove nitrogen purge system according to claim 3, wherein the weld of the first nitrogen pipe and the second sub is close to one side of the gas shut-off valve; and/or the position of the welding point of the first nitrogen pipe and the second nipple is located at 1/5-1/2 of the distance between the gas cut-off valve and the second nipple.
5. The hot blast stove nitrogen purging system as claimed in claim 4, further comprising a bleeding pipe in communication with the second nipple, wherein the location of the welding point of the first nitrogen pipe and the second nipple is upstream of the location of the welding point of the bleeding pipe and the second nipple.
6. The hot blast stove nitrogen purging system according to any of the claims 3 to 5, characterized in, that the first nitrogen pipe has an angle θ with the horizontal plane and 0 ° < θ < 90 °; And/or 90 ° < θ < 180 °.
7. The hot blast stove nitrogen purging system according to any of the claims 1 to 5, further comprising a safety valve provided to the nitrogen main, the safety valve being located upstream of the pressure detection system; and/or the pressure detection system comprises a pressure gauge, a pressure gauge elbow and a needle valve.
8. The hot blast stove nitrogen purging system as claimed in any one of claims 1 to 5, wherein the flow monitoring device is a volumetric flow meter.
9. The hot blast stove nitrogen purge system according to any of claims 1-5, wherein the nitrogen valve block comprises a first manual nitrogen purge valve, a pneumatic nitrogen purge valve and a second manual nitrogen purge valve arranged in sequence on the nitrogen branch; And/or the first manual nitrogen purging valve, the pneumatic nitrogen purging valve and/or the second manual nitrogen purging valve are/is detachably connected with the nitrogen branch in a sealing way through a flange plate.
10. A hot blast stove nitrogen purging method, based on a hot blast stove nitrogen purging system as claimed in any one of claims 1-9, characterized by comprising the steps of: acquiring the total volume of the first nipple and the second nipple; in the process of switching the hot blast stove from a combustion state to an air supply state, closing the gas cut-off valve; opening the nitrogen valve group, and obtaining the volume flow value of the flow monitoring device until the purging time is greater than the ratio of the total volume of the first nipple and the second nipple to the volume flow value of the flow monitoring device; and closing the nitrogen valve group, closing the gas combustion valve, and opening the bleeding pipe, namely completing purging.

Description

Hot-blast stove nitrogen purging system and purging method Technical Field The application belongs to the technical field of hot blast stoves, and particularly relates to a nitrogen purging system and a purging method for a hot blast stove. Background The blast furnace hot blast stove plays a role in providing hot air for the blast furnace in the blast furnace production process, heat is accumulated by the lattice bricks which are combusted in the heat accumulating chamber in the combustion chamber of the hot blast stove through the proportion of blast furnace gas and air, and cold air is used by the blast furnace after the temperature is heated to a certain temperature through the heat accumulating chamber of the hot blast stove. The existing short joint between the gas combustion valve and the gas cut-off valve of the gas pipeline has no purge replacement device, and the residual gas in the short joint between the gas combustion valve and the gas cut-off valve can be diffused only by means of the suction force of the diffusion chimney of the short joint between the gas combustion valve and the gas cut-off valve. Disclosure of Invention The application provides a nitrogen purging system and a purging method for a hot blast stove, which aim to solve the technical problems of poor diffusion of residual gas between a gas combustion valve and a gas cut-off valve of a gas pipeline and residual gas between the gas combustion valve and a stove body of the hot blast stove at present. In a first aspect of the present application, there is provided a hot blast stove nitrogen purging system, the hot blast stove being provided with a first nipple, a second nipple, a third nipple, and a gas combustion valve provided between the first nipple and the second nipple and a gas shut-off valve provided between the second nipple and the third nipple in communication, the first nipple being in communication with the hot blast stove, the hot blast stove nitrogen purging system being in communication with the second nipple, the hot blast stove nitrogen purging system comprising: The nitrogen main pipe is provided with nitrogen connecting holes the same as the hot blast stove in number; The purging subsystem is communicated with the corresponding nitrogen connecting holes, comprises a nitrogen branch and a nitrogen valve group arranged on the nitrogen branch, wherein the nitrogen branch is used for being communicated with the second nipple, and the nitrogen branch and the second nipple are arranged at an angle; The flow monitoring device is arranged on the nitrogen branch and is positioned at the upstream of the nitrogen valve group; And the pressure detection system is arranged on the nitrogen main pipe and is positioned at the upstream of the purging subsystem. In some embodiments, two ends of the nitrogen branch are respectively welded with the second nipple and the nitrogen header pipe, and the welding point of the nitrogen branch and the second nipple is positioned below the axis of the second nipple. In some embodiments, the nitrogen branch comprises a first nitrogen pipe and a second nitrogen pipe which are arranged at an angle and are sequentially connected and communicated, the first nitrogen pipe is connected with the second nipple, and the first nitrogen pipe is arranged along the radial direction of the second nipple; The second nitrogen pipe is connected and communicated with the nitrogen header pipe. In some embodiments, the welding point of the first nitrogen pipe and the second nipple is close to one side of the gas shut-off valve; and/or the position of the welding point of the first nitrogen pipe and the second nipple is located at 1/5-1/2 of the distance between the gas cut-off valve and the second nipple. In some embodiments, the hot blast stove nitrogen purging system is further provided with a diffusing pipe communicated with the second nipple, and the position of the welding point of the first nitrogen pipe and the second nipple is located upstream of the position of the welding point of the diffusing pipe and the second nipple. In some embodiments, the first nitrogen pipe has an angle θ with the horizontal, and 0 ° < θ <90 °; And/or 90 ° < θ <180 °. In some embodiments, the stove nitrogen purge system further comprises a safety valve provided to the nitrogen manifold, the safety valve being located upstream of the pressure detection system; and/or the pressure detection system comprises a pressure gauge, a pressure gauge elbow and a needle valve. In some embodiments, the flow monitoring device is a volumetric flow meter. In some embodiments, the nitrogen valve set comprises a first manual nitrogen purge valve, a pneumatic nitrogen purge valve and a second manual nitrogen purge valve sequentially arranged on the nitrogen branch; And/or the first manual nitrogen purging valve, the pneumatic nitrogen purging valve and/or the second manual nitrogen purging valve are/is detachably connected with the nitrogen bra