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On-line cutting process of flue gas pipeline in waste heat recovery area of ​​blast furnace hot blast stove

A waste heat recovery and cutting process technology, applied in blast furnaces, blast furnace details, blast furnace parts, etc., can solve problems such as slow progress and restrict blast furnace production recovery, and achieve the effect of shortening the air off time and reducing the impact of blast furnace production.

Active Publication Date: 2021-06-25
SGIS SONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Slow progress in on-site construction often severely restricts the timely resumption of production of the blast furnace

Method used

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  • On-line cutting process of flue gas pipeline in waste heat recovery area of ​​blast furnace hot blast stove

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] see figure 1 , in a company's 3200m 3 It is applied in the transformation process of blast furnace hot blast stove preheater, and the process is:

[0019] The first step is to open the flue gas bypass valve 13 of the hot blast stove 19, the air bypass valve 11, and the gas bypass valve 5, and then close the flue gas inlet valve 1, the flue gas inlet valve 2, and the flue gas outlet valve 18 , flue gas outlet valve 2 9, combustion air inlet valve 10, combustion air outlet valve 12, gas inlet valve 7, gas outlet valve 3, and manual confirmation on site, the original air preheater 18 and gas preheater 17 are Exit the hot blast stove 19 waste heat recovery system.

[0020] In the second step, unscrew the thermometer 4 on the two flue gas preheaters to confirm the internal conditions of the flue gas preheaters. If there is airflow drawn inward, it can be determined that the interior of the flue gas preheater 14 and the flue gas preheater 2 15 are in a negative pressure st...

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Abstract

The invention relates to an online flue gas pipeline cutting process in the waste heat recovery area of ​​a blast furnace hot blast stove. The thermometer in the flue gas preheater is used as the suction port of the flue gas preheater to confirm the condition of the air inhaled inside the flue gas preheater; the third step is to manually open the outlet valves of the two flue gas preheaters, Nitrogen gas is introduced to expel the internal gas, and the mixed gas is completely drawn out of the flue gas preheater under the action of the chimney’s suction; the fourth step is to stop feeding nitrogen, and under the action of the chimney’s suction, the air flows from the The manhole enters the flue gas preheater and can be cut safely. The cutting of the flue gas pipeline in the waste heat recovery area can be completed before the blast furnace shutdown, which greatly shortens the shutdown time of the blast furnace combined with the preheater transformation, and reduces the impact on blast furnace production.

Description

technical field [0001] The invention belongs to the technical field of treatment technology of blast furnace hot blast stove equipment, and relates to an online cutting process of a flue gas pipeline in a waste heat recovery area of ​​a blast furnace hot blast stove. Background technique [0002] During the transformation of the preheater in the waste heat recovery area of ​​the blast furnace hot blast stove, if the flue gas blind plate valve inside the electric butterfly valve of the flue fails, the flue pipe inside the electric butterfly valve needs to be cut and the blind plate welded to match the original hot blast stove flue gas. The system is completely cut off. The heat insulation of the inner wall of the flue pipe adopts the existing construction technology of anchors and sprayed paint layers: after the blast furnace shuts down the hot blast stove to stop burning (purging), the flue pipe is cut and the blind plate is welded. The slow progress in on-site construction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B9/00C21B9/10
CPCC21B9/00C21B9/10
Inventor 杨国新柏徳春邹林何勇周凌云刘引锋陈小东
Owner SGIS SONGSHAN CO LTD