Adjusting method for cooling mode of hot blast valve water cooling flange

Abstract

The invention discloses a method for adjusting the cooling mode of a hot blast valve water-cooling flange. A hot blast valve water-cooling flange cooling system is externally arranged and isolated from a pipeline. By improving the cooling mode of the hot air pipeline water-cooling flange, the situation that cooling water enters the hot air pipeline to damage a refractory material structure in the pipeline due to water leakage of the water-cooling flange is avoided.

Description

Technical Field

[0001] The invention relates to the field of metallurgy, and in particular to a method for adjusting the cooling mode of a water-cooled flange of a hot air valve. Background Art

[0002] During the use of the hot blast furnace, the water-cooled flange of the hot blast valve is prone to cracking and leaking due to external reasons. The water-cooled flange leaks into the hot blast duct, destroying the refractory and refractory brick structure inside the hot blast duct, causing the refractory bricks to fall off, the refractory to loosen, and the temperature outside the hot blast duct to rise, seriously affecting the safe production of the blast furnace.

[0003] In this regard, the existing technology often adopts the measures of welding the water-cooling flange and replenishing the refractory material. However, after a period of operation, the temperature of the inner flange of the hot air valve still rises, and the outer flange of the hot air valve leaks, causing a certain degree of damage to the refractory material.

[0004] Therefore, it is necessary to adjust the existing cooling method of the hot air valve water-cooled flange to overcome the water leakage problem. Summary of the invention

[0005] Purpose of the invention: In view of the shortcomings and defects of the prior art, the present invention provides a method for adjusting the cooling mode of the water-cooled flange of a hot air valve. By improving the cooling mode of the water-cooled flange of the hot air duct, the situation in which cooling water enters the hot air duct and damages the refractory structure inside the duct due to leakage of the water-cooled flange is prevented.

[0006] Technical solution: A method for adjusting the cooling mode of a water-cooled flange of a hot air valve according to the present invention is characterized in that the cooling system of the water-cooled flange of the hot air valve is externalized and isolated from the pipeline.

[0007] The specific steps include:

[0008] 1) Weld an outer box to the outside of the original water-cooling flange and leave a cooling water passage;

[0009] 2) Take advantage of the wind break to grout the cooling water channel inside the original water-cooling flange;

[0010] 3) Cool the existing water-cooled flange package by passing water.

[0011] Wherein, a refractory material is arranged inside the pipeline, and the water-cooled flange cooling system of the hot air valve is isolated from the refractory material inside the pipeline.

[0012] Wherein, in the step 1), a normal water cooling channel is left in the outer box.

[0013] Among them, in the step 2), the water supply to the original water-cooled flange is stopped and grouting is performed after the hot air duct of the blast furnace is cooled down, and the grouting material can withstand the high temperature of the hot air duct system.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The present invention improves the cooling method of the water-cooled flange of the hot air duct to prevent the cooling water from entering the hot air duct and damaging the internal refractory structure of the duct due to water leakage of the water-cooled flange. Practice has found that even if the water of the water-cooled flange of the present invention is cut off, the refractory material inside the water-cooled flange can still play a heat-insulating role in a short time to avoid the hot air duct system from burning through due to excessive temperature; at the same time, the present invention uses external cooling, so even if the cooling water leaks, it will not cause the cooling water to enter the hot air duct system and damage the internal refractory material. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0017] The method for adjusting the cooling mode of the water-cooled flange of the hot air valve of the present invention is characterized in that: the cooling system of the water-cooled flange of the hot air valve is placed externally and isolated from the pipeline. A refractory material is arranged inside the pipeline, and the cooling system of the water-cooled flange of the hot air valve is isolated from the refractory material inside the pipeline. Specifically, the following steps are included:

[0018] 1) An outer box is welded to the outside of the original water-cooling flange, and a cooling water passage is left; a normal water cooling passage is left in the outer box.

[0019] 2) Take advantage of the wind stop opportunity to grout the cooling water channel inside the original water-cooled flange; use the blast furnace wind stop to cool down the hot air pipeline and then stop the water supply and grout the original water-cooled flange, and the grouting material can withstand the high temperature of the hot air pipe system.

[0020] 3) Cool the existing water-cooled flange package by passing water.

[0021] Example:

[0022] The present invention is used in the outer flange of the 4# hot blast valve and the inner and outer flanges of the 6# hot blast valve of the 2# blast furnace of the First Ironmaking Plant of Nanjing Iron and Steel Group. After being put into use, it can ensure that cooling water does not enter the hot blast pipe system and thus enter the blast furnace to affect smelting without affecting normal production, and at the same time, it will not cause the hot blast furnace to stop due to excessive temperature of the pipe system.

[0023] After practical benefit analysis:

[0024] The present invention reduces the amount of cooling water entering the interior of the blast furnace, which results in an increase in hydrogen content and increased coke usage.

[0025] The present invention prevents the situation that the temperature of the hot air pipe system rises due to the damage of the refractory material caused by the cooling water entering the pipe system, which may cause the hot air furnace to stop. The shutdown of a single hot air furnace will cause the wind temperature to decrease by 30°C and the fuel ratio to increase by 3kg / t. According to the current cost settlement, the cost increases by 2.5-3 yuan for every 1 kg increase in the fuel ratio. Based on an annual output of 2.5 million tons, the cost can be saved by 2500000*8=20 million yuan.

[0026] The present invention prevents the situation in which cooling water enters the pipe system and damages the internal refractory material due to water leakage from the outer flange, causing the temperature of the pipe system to rise and resulting in the blast furnace being shut down.

Claims

1. A method for adjusting the cooling mode of a water-cooled flange of a hot air valve, characterized in that: Place the hot air valve water-cooled flange cooling system externally and isolate it from the pipeline.

2. The method for adjusting the cooling mode of the water-cooled flange of the hot air valve according to claim 1 is characterized in that: The specific steps include: 1) Weld an outer box to the outside of the original water-cooling flange and leave a cooling water passage; 2) Take advantage of the wind break to grout the cooling water channel inside the original water-cooling flange; 3) Cool the existing water-cooled flange package by passing water.

3. The method for adjusting the cooling mode of the water-cooled flange of the hot air valve according to claim 1 is characterized in that: Refractory materials are arranged inside the pipeline, and the water-cooled flange cooling system of the hot air valve is isolated from the refractory materials inside the pipeline.

4. The method for adjusting the cooling mode of the water-cooled flange of the hot air valve according to claim 2 is characterized in that: In the step 1), a normal water cooling channel is left in the outer box.

5. The method for adjusting the cooling mode of the water-cooled flange of the hot air valve according to claim 2 is characterized in that: In the step 2), the water supply to the original water-cooled flange is stopped and grouting is performed after the hot air duct of the blast furnace is cooled down, and the grouting material can withstand the high temperature of the hot air duct system.

Images