JPS6125995B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cooling device for a furnace body such as a blast furnace.

Protecting the furnace body through cooling is an essential requirement for the furnace body of a blast furnace, etc., and for this purpose, there are systems in which many cooling boxes are buried within the refractory bricks of the furnace wall, and many staves are buried within the refractory bricks. .

Conventionally, systems for supplying cooling medium (usually using water) to cooling devices such as a large number of cooling boxes or staves have traditionally had a large number of cooling parts.
These are divided into multiple series and a cooling system is installed for each group, but each system is connected, so even if one of the series is damaged, the supply water will not be returned to the reactor. It has been extremely difficult to detect the damaged box, damaged area, or stave once the intrusion has occurred. If breakage occurs in this manner and infiltration into the furnace occurs, early detection is delayed and the furnace heat decreases, causing the furnace to cool down and significantly hindering operations, resulting in great damage.

FIG. 1 shows a blast furnace with a conventionally employed stave cooling system, and shows one series in a simplified manner. In reality, the stave cooling plate 4 has several tens of stages, and is composed of refractory bricks 14 that constitute the furnace wall inside the blast furnace 1.
It is covered with iron shell 3 and buried inside. A cooling pipe 5 is embedded in this stave 4, and a cooling medium 11 flows through this pipe to perform cooling. Each of the staves 4 is connected by a connecting pipe.
The cooling medium 11 is generally water, such as degassed pure water. This water 11 is sent from the steam/water separation drum 10 to the lower loader 6 via the downcomer pipe 9 and the forced circulation pump 8, and flows through the cooling pipe 5 for cooling. The water 11 that has cooled each stave 4 is returned to the water supply drum 10 via the return header 7.

According to this particularly conventional device, each stave cooling plate 4 is directly connected and forms a series, so if the cooling pipe 5 in the furnace is damaged, as described above, water will not enter the furnace. Of course, it is possible to break the plate, and it is difficult to find the broken plate, which requires the furnace to be shut down. Moreover, even if damage was discovered, the cooling pipe for that plate had to be blocked off and a new bypass pipe had to be installed, which was a very difficult task.

The present invention eliminates the above-mentioned drawbacks, and even if a cooling pipe breaks, the damaged part can be easily found.
To provide a cooling device for a furnace body in which only a damaged part of the pipe needs to be treated, only a small amount of water intrudes into the furnace because only the water in the pipe exists, and gas in the furnace does not leak to the outside. The purpose is to

Embodiments of the present invention will be described with reference to the drawings.

In FIG. 2, within the refractory bricks 14 constituting the furnace wall of the furnace 1, staves 4, 4,
... are arranged in parallel, and inside each stave 4, a plurality of heat pipes 24, 24, ... are buried along the surface of the stave 4. Covered by 3.

One end of the heat pipe 24 protrudes from the stave 4 and communicates with a cooling device 25 located outside the furnace 1. Also, one end of the heat pipe 24 has a fin 19, and the end surface thereof has a fin 19 as shown in FIG. As shown in FIG. 2, a temperature sensing device 26 such as a thermo tape or a thermocouple is provided.

The heat pipe 24 has a pure copper layer 21 inside an outer shell tube made of a stainless steel pipe or a steel pipe 20.
This pure copper layer 21 is preferably a cladding of a pure copper pipe, and water 2 is contained therein as a cooling medium.
Enclose 2. 23 can be used as needed.

The cooling device 25 is composed of a plurality of independent cooling tanks 15 for each heat pipe 24 that receives the portion of the heat pipe 24 exiting the furnace 1, and a pipe 16 that connects the upper and lower cooling tanks 15. 16 has one end communicating with the upper surface of the upper cooling tank 15 and the other end facing above the lower cooling tank 15, and the water supply pipe 13 attached to the header 12 is disposed above the uppermost cooling tank 15. Set up

When the stave plate 4 receives a heat load 2 from inside the furnace 1, the buried heat pipe 24 inside the stave 4 is heated, and the cooling medium 22 dissipates the heat and moves upward, causing a cooling water flow in the cooling tank 15. The liquid reaches the fin portion 19 of the heat pipe 24 sunk inside, condenses, becomes droplets, passes through the wick 23, and descends into the stave 4 again. Cooling is continued by repeating this action. The cooling water 19 reaches the top stage cooling tank 15 from the header 12 via the water supply pipe 13, cools the cooling fin portion 19 of the heat pipe 24, overflows, and reaches the next stage via the pipe 16.

In this explanation, downstream cooling from upstream to downstream is suggested, but if necessary, it is also possible to seal the cooling tank and generate a flow from below to above using a pump.

As described above, since the present invention has the above-mentioned configuration, the heat pipes are provided independently, and even if one heat pipe is damaged, the cooling capacity of the stave will be limited to that of the remaining heat pipes. Since the cooling function operates by transmitting the heat pipe to the stave, the cooling capacity is only slightly reduced, and it can be used continuously for the required period of time.If the stave has a damaged heat pipe, it can be replaced at an appropriate time. Even if the heat pipe is damaged, water will only infiltrate the cooling medium inside the heat pipe, and the impact on furnace operation will be minimal. Furthermore, since the one end of the heat pipe that is connected to the cooling device is located above the other end of the heat pipe, it is cooled by the cooling device and condenses, and the droplets rapidly fall and end at the other end. The cooling efficiency is good so that the parts are heated. Since the heat pipe described above is located in a stave buried within the furnace wall, the heat pipe is not directly exposed to the high temperature atmosphere of the furnace, and damage to the heat pipe is extremely rare. In addition, there is no leakage of the gas inside the furnace to the outside, which does not impede the operation and is of great benefit in terms of disaster prevention.

Note that damage can be easily detected using a temperature sensing device at the cooling end of the heat pipe.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main parts of a conventional cooling device for a high-temperature furnace, FIG. 2 is a sectional view of the main parts of an embodiment of the present invention, FIG. 3 is a side view of the main parts of FIG. The figure is a cross-sectional view of a heat pipe. 1: Furnace, 2: Heat load, 4: Stave, 14: Firebrick, 15: Cooling tank, 16: Pipe, 19: Fin, 20: Stainless steel pipe or steel pipe, 21: Pure copper layer, 22: Water, 24: Heat pipe, 25: Cooling device, 26: Temperature sensing device.

Claims (1)

[Scope of Claims] 1. A cooling device for a furnace body, which has a cooling device outside the furnace and has a plurality of staves with cooling pipes embedded inside the furnace wall arranged in parallel in the vertical direction of the furnace wall, A plurality of heat pipes are buried in each stave along the surface of the stave, and one end of the heat pipe protrudes from the stave and communicates with a cooling device provided outside the furnace. A cooling device for a furnace body, characterized in that each of the staves is arranged within a furnace wall so that the one end portion is located above the other end portion of the heat pipe. 2. A cooling device for a furnace body according to claim 1, wherein a temperature sensing device is provided in a portion of the heat pipe extending outside the furnace. 3. The furnace body cooling device according to claim 1 or 2, wherein the heat pipe has a pure copper layer inside a stainless steel pipe or a steel pipe, and has water sealed inside.