JPS5980736A - Removing method of high temperature deposit - Google Patents

Abstract

PURPOSE:To break and strip easily and safely the hot deposit accumulating in the high temp. outlet gas way of a roasting furnace or the like by injecting high pressure water to said deposit. CONSTITUTION:A sintered material 4 of ore of a raw material to be treated sticks in an outlet gas flue 8 provided in the upper part of various roasting furnaces, flash smelting furnace, etc. 1. The inside of the flue 8 is maintained under the pressure slightly more negative than the atm. air in this stage, and one of plural cleaning ports 8a is opened, through which a water spray gun 9 is inserted and the nozzle part 11 at the tip thereof is pressed to the stuck material 4. A high speed jetter 12 is driven to inject the high pressure water kept under 250-300kg/cm<2> from the nozzle 11 to the material 4 of high temp. The water diffuses into the material 4 and evaporates slightly explosively by the effect of high temp. about 1,100 deg.C in the flue 8 thus causing a steam explosion. The material 4 is then broken by the sudden expansion force and is stripped off from the inside wall of the flue 8. The material 4 is removed in a shorter time and with higher safety than by a conventional removing method using such as an iron bar or hammer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing high-temperature deposits for cleaning deposits deposited on high-temperature outlet gas paths of roasting furnaces, flash furnaces, etc. used in metal smelting. .

For example, in the zinc smelting process, the action of ZnS +102-+ZnO+ Box is performed using a roasting furnace maintained at a high temperature of approximately 1100°C. Since the temperature of the gas pipe reaches a high temperature of 900℃ or more, high-temperature deposits (hereinafter referred to as
There is a characteristic that causes a phenomenon called beko.

For example, in the case of a large furnace with a furnace diameter of 9.6 m, a gas path diameter of 2.3 m, and an exhaust gas flow rate of 50 ONm/min, the amount of veco adhesion reaches 0.5'r/E1, and the furnace diameter is 5. 7m1 gas pipe diameter 1.3ra, exhaust gas flow rate 20ONm/min,
The thickness of the beco reaches 500-600 IIn.

For this reason, during the operation of the roasting furnace, it is often necessary to clean the vessel.Here, a conventional method for removing high-temperature deposits will be explained with reference to FIG.

The exhaust gas discharged from the roasting furnace 1 flows through the outlet gas path 2 to the boiler 3 for heat recovery. part)
The cleaning opening 2a is opened and normally closed with a lid, and the opening 4 is attached to the inner wall of the gas passage 2.

By the way, in the conventional removal method, first, the internal pressure of the furnace is maintained at a negative pressure to prevent gas from blowing out to the outside, and then the cleaning port 2a is opened one by one in sequence, and then one person works five times. However, the iron rod 6 with a thickness of 7A" to 1" is inserted into the gas pipe 2, and its tip is placed on the beko 4, and in that state, after the other person is working, the iron rod 6 is inserted into the gas pipe 2. The front end of 6 slammed into it, and the impact shattered Beko 4.

In this way, after completing the crushing from one cleaning port 2a, move to the other cleaning port 2a, crush and crush the beko 4 in the same way, and repeat this to complete the removal of the beko 4, The crushed Beko 4 falls into several tons of the furnace 1 or boiler 3.

Note that instead of crushing with the iron rod 6, the beco 4 may be crushed using a rock drill.

However, during the lever work, the temperature inside the gas line 2 (1100
The iron rod 6 becomes red hot in a few minutes due to the temperature (around 10°C), making the work dangerous and tiring. As a result, the work area has to be changed frequently, resulting in low work efficiency. However, the iron rod 6 is easily bent due to its softening, and in that case, it is troublesome to replace the iron rod with a spare iron rod or to straighten the bent iron rod with soil.

In addition, since many cleaning ports 2a must be opened in the gas path 2Vc, there is a problem that there is a high risk of gas leakage.

As described above, the conventional removal method V has a problem in that it is inferior in terms of workability such as work efficiency, work fatigue level, and work environment.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for removing high-temperature deposits with excellent workability.

As a means to achieve this objective, the removal method of the present invention includes:
High-pressure water is supplied to the hand side, and a rod-shaped water injection gun that squirts the same high-pressure water from a nozzle formed at the tip is used to spray the surrounding walls of high-temperature gas paths in roasting furnaces, flash furnaces, etc. High-pressure water is introduced from the cleaning port toward the high-temperature deposits deposited on the inner wall of the gas pipe, and the deposits are broken up and peeled off based on the steam and explosive force generated when the water injected into the deposits evaporates. It is characterized by the fact that

The present invention will be described below based on an illustrated embodiment.

For example, the outlet gas passage 8 of the roasting furnace 1 to be cleaned by the removal method of the embodiment has two cleaning ports 8a on the furnace 111II and boiler 3 sides, as shown in Figure G2, and
The following members are attached to the roasting furnace 1 as cleaning tools.

(a) Water injection gun 9 Made of a rod-shaped body with an inner hole, and on the front side thereof,
250-300ky/cr via high pressure hose 10
1 of high-pressure water is supplied to the inner hole, and at its tip,
A nozzle 11 is formed so that the high pressure water is injected from the nozzle 11.

The diameter of the nozzle 11 is preferably 1.0 to 2.0 mm. If it is less than 1.0 + ragφ, the amount of water will not be enough, and 2
．． This is because if the diameter is 0 or more, no water pressure will be produced and the amount of water will be too large. - As a mode, it was performed with a diameter of 1.35 mm and a predetermined effect was obtained.

(b) High-speed jetter 12 This is a pressurizer that pressurizes clean water to a maximum of 550 kg/ct/Ivc.

(C) High-pressure piping 13 This is a fixed piping that connects the fixed side of the high-pressure hose 10 and the jetter 12.

Therefore, when performing cleaning work using the removal method of the embodiment, first, the internal pressure of the furnace 1 is maintained at a negative pressure as in the conventional method described above, and then one of the cleaning ports 8a (in the illustration, Then, after the work is completed, the water jet 79 is inserted into the cleaning port 88 and the nozzle 11 at the tip is applied to the blade 4.

Next, the water pressure is adjusted in advance to 250~250 using the pressure regulating valve 14.
Adjust to 300 kg/ca, open the intermediate valve 15, turn the injection gun lever 6, and supply high-pressure water to the nozzle 11 at a flow rate of 920 to 3027 minutes. Due to the injection pressure, the high-pressure water oozes into the interior of the Shibeko 4 and the injected moisture diffuses, and the moisture is further heated to a high temperature of around 1100°C in the gas pipe 8, causing a small explosion. Vaporization occurs (steam explosion occurs), and the sudden expansion force at that time causes the shell 4 to be crushed and peeled off from the inner wall of the gas passage 8.

After that, if the same operation is repeated with the soil with the other cleaning port 8a opened, the entire surface of the beco 4 will be removed and it will fall across the furnace 1 and into the digi 3.

In this type of removal work, the Beko 4 is crushed using rapid power, so the Beko 4 can be removed in a short time. According to the example method, the time is reduced to 30 minutes.

Furthermore, the above-mentioned work does not cause great fatigue to the worker 5, so there is no need for substitute personnel.
However, with this method, only two workers are required, and in terms of maintenance of the roasting furnace, the removal work is carried out about four times per furnace per month. Good.

In addition, since only two cleaning ports 8a are required, the environmental aspects caused by ore leakage are significantly improved, and there is an advantage that the removal work can be carried out while the roasting furnace 1 is in operation.

By the way, in the method of the example, since clean water is used for crushing Beko 4, (a) water consumption and (b)
), and the heat removal effect of the heat inside the furnace.However, as for the consumption of clean water in the former, as mentioned above, the consumption per one time) is 20 to 30t x 30
Minutes = 0.6~0. 'J, m is insignificant.As for the latter heat removal effect, the absolute flow rate of the outlet gas is very large, so no decrease in the gas temperature has been observed experimentally. , this is not a disadvantage of the embodiment.

As described above, according to the method for removing high-temperature deposits according to the present invention, high-pressure clean water sprayed from the nozzle of a water injection gun removes high-temperature deposits deposited on the inner wall of the outlet gas path of a roasting furnace, etc. Since the fracture is caused by the steam explosion force of the injected water, the removal work can be carried out easily and easily.
The working environment is also improved, which has the practical effect of making maintenance of high-temperature furnaces easier.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an outlet gas path cleaned by a conventional removal method, and FIG. 2 is a schematic diagram of an outlet gas path cleaned by a high-temperature deposit removal method showing one implementation of the present invention. It is. 1... Roasting furnace, 4... Beko as a high-temperature deposit, 8
...Exit gas path, 8a...Cleaning port, 9...Water injection gun, 10...High pressure hose. Patent applicant Nippon Mining Co., Ltd. Patent attorney Norio Nishimura 211

Claims (1)

[Claims] High-pressure water is supplied to the hand side, and a rod-shaped water jet gun that squirts the high-pressure water from a nozzle formed at the tip is used to remove high-temperature water from the cleaning opening on the peripheral wall of the gas pipe. A high-temperature application characterized in that high-pressure water is introduced toward high-temperature deposits deposited on an inner wall, and the deposits are crushed and peeled off based on the steam explosion action force when the water injected into the deposits vaporizes. How to remove kimono.