JPS5920376Y2 - Mortar spraying equipment for furnace wall repair - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a dry mortar spraying device used for repairing a furnace wall of a kiln.

Kilns such as coke ovens are made of bricks of various shapes and materials, but due to repeated charging, heating, and extraction of objects, changes in furnace temperature, etc., spalling and joint breaks occur in the furnace wall bricks. .

To repair this, mortar was sprayed using a conventional method.

(1) Wet sprayer maximum particle size is 0.5ml1n, 70% is 0.074mm or less
4. Powdered refractory mortar of about 100% is kneaded with 60% to 70% water to obtain a mortar solution with a specific gravity of 1.4% to 1.8%, and this is placed in a spray container 1 as shown in FIG. It has a structure in which the mortar liquid 2 is pressurized with air at 5 to 5°0 kg/cm2 and taken out with a hose, and is sprayed onto the repaired part while being atomized with a spray nozzle.

3 in the figure indicates a pressure gauge. Generally, spraying work is carried out with the furnace interior open, so it is necessary to perform repairs efficiently in a short period of time in order to prevent cooling of the furnace interior and extend the life of the furnace.

However, when this wet spraying method is adopted, pre-mixing is required, the mortar liquid contains 60 to 70% moisture, and the inside of the furnace must be cooled, and the spraying process requires inserting a nozzle into the high-temperature furnace. There are various disadvantages such as mortar liquid solidifying inside the pipe and clogging easily, resulting in poor working efficiency.

(2) Dry-type spraying machine This device improves the drawbacks of wet-type spraying machines. The refractory material for repair is put into a spraying container in powder form, and the mortar powder is collected at the bottom with pressurized air and taken out through the bottom transport pipe. The structure is such that pressurized air is mixed into the water, mixed with water at the nozzle, and then sprayed.

An example of a dry spraying machine used in this method is shown in FIGS. 2 and 3, and its characteristics will be explained below.

In the case of FIG. 2: Mortar powder 5 is scraped out by rotating a field wheel 4 provided at the mortar discharge port at the bottom of the mortar tank 1, and pumped by air pressure with an air motor 6.

7 in the figure indicates water.

The amount of material blown out can be adjusted by changing the rotation speed of the plate 4, but this requires an air motor to drive the plate, electric power to operate the material discharge solenoid valve, etc.
Structurally complex.

Furthermore, ■ The structure is large and difficult to move.

■ Difficult to disassemble and maintain due to complex mechanism.

◎ Frequently valves become inoperable due to voltage fluctuations.

■ If the mortar blowing pressure decreases, the mortar will become clogged at the nozzle tip.

There are other problems.

In the case of FIG. 3: The mortar discharge rate is adjusted by a butterfly valve 8, and the structure is simpler than that in FIG. 2.

However, when mortar becomes a fine powder with a maximum particle size of about 0.5 mm or less, it tends to coagulate in the tank, which makes the amount of mortar blown out unstable and causes variations in the mixing ratio with water at the nozzle tip. The disadvantage is that it cannot be repaired uniformly and quickly.

The present invention was developed with the aim of solving these drawbacks of conventional mortar spraying machines and developing a simple dry spraying machine that can repair furnace walls uniformly in a short time without being limited by mortar particle size. It is.

That is, in the present invention, a pressurized air pipe is inserted from the outside to near the bottom of a powder mortar tank, and the pressurized air pipe has air jet holes drilled at the tip and at multiple locations in the vicinity. A compressed air pipe is connected in the middle of the mortar transport pipe leading to the spray nozzle, and an ejector is installed at the connection point.
This mortar spraying device for furnace wall repair is provided with a nozzle and a pressurized water pipe is connected to the tip of the mortar spraying nozzle.

The apparatus of the present invention will be explained below based on the embodiments shown in FIGS. 4 and 5.

FIG. 4 is a front sectional view of the device of the present invention, and FIG. 5 is an enlarged sectional view of the nozzle portion where the mortar pipe and the wood pipe are connected.

In FIG. 4, mortar powder is charged into the mortar tank 1 through the charging port 12, and water is charged into the water tank 9 through the water supply port 9-1.

These tanks 1 and 9 are constructed of pressure containers of about 6 kg/cm'.

Pressurized air entering the drain pipe 11 from an air compressor (not shown) via the valve 10 is divided and pumped for three types of uses.

That is, a portion is sent to the water tank 9 via the air pipe 12 and the pressure regulating valve 13.

This pressure regulating valve 13 controls the inside of the water tank 9 at approximately 3.0-4.0 k
Pressurize to g/cm2.

Also, some of the air flows from the drain pipe 6 to the valve 14 and the pressure reducing valve 15.
It is sent to the mortar tank 1 through the air pipe 12.
is inserted from the top of the mortar tank 1 to near the bottom outlet, and there are air holes 1 at the tip of the tube and several holes just above it.
Pressurized air is blown out from 2-1 (about 2 mm in diameter) to stir and pressurize the mortar in the mortar tank 1 at the same time.

The pressing force in this case is approximately 1.5 to 3.0 kg/cm2
It is adjusted by the pressure reducing valve 15 so that

A valve 1 such as a pinch valve is installed at the bottom outlet of the mortar tank 1.
6 is provided, and a mortar pipe 17 extending from this is connected to an air pipe 19 with a valve 18 originating from the drain pipe 11.

An ejector nozzle 20 is installed at the connection between the mortar pipe 17 and the air pipe, and is used to forcefully transport mortar powder by pressurized air to a spray nozzle 22 through an elastic hose 21 as shown in FIG.

On the other hand, a pressure gauge 23, a safety valve 24, and an exhaust port 9-2 are attached to the upper part of the mortar tank 1 and the water tank 3, respectively.
The pressure gauge 23 is used to monitor the tank internal pressure, the safety valve 24 is used to reduce the pressure in the tank when the pressure rises abnormally due to a failure of the air compressor, etc., and the exhaust port 9-2 is used to temporarily release the tank internal pressure when the equipment is stopped, repaired, or restarted. used when

In addition, the water pipe 25 connected to the lower part of the water tank 9 has a water stop valve 26,
It communicates with the mortar spray nozzle 22 via an elastic hose 27 and a water flow control valve 28.

A drain pipe 29 is connected to the bottom of the water tank 9, and is used for draining water when the device is shut down or repaired.

Further, the drain accumulated in the drain pipe 11 is extracted to a pipe 30 connected to the bottom.

Furthermore, all of the devices described above can be installed on a loading platform 32 having wheels 31, and therefore can be easily moved to the vicinity of the furnace wall that requires repair.

The present invention has the above-mentioned configuration, and its operating procedure will be explained next.

First, water pressurized to about 3.0 to 4.0 kg/c+nF in the water tank 9 is forced into the spray nozzle 22 through the water pipe 25, the valve 25, the hose 27, and the valve 28.

Moreover, the mortar powder in the mortar tank 1 is
At the same time, it is stirred by the air jetting out from 1.
5. It is pressurized to 3.0 kg/cm2 and is pushed out into the mortar pipe 17 below while the discharge amount is adjusted by the valve 16.

Next, this mortar powder is sucked by the pressurized air coming out of the ejector nozzle 20, is forced to the spray nozzle 22 via the hose 21, and is mixed with the water sent from the water tank 9 at the tip and sent to the furnace wall repair part. be sprayed.

The mixing ratio of mortar powder and water can be adjusted by a water amount control valve 28, and the water mixing ratio is normally controlled to about 35 to 40%.

Further, the refractory spraying pressure can be freely adjusted according to the temperature using the valve 18.

Further, by using a means such as abutting a disc-shaped object 33 called a top with an oblique keyway on the water pipe tip of the spray nozzle 21, the water is radiated in a circular shape, thereby uniformly distributing the water with the mortar. It can be injected while mixing.

Since the present invention has the above-mentioned configuration, (1) Since the inside of the mortar tank is constantly stirred, it is possible to completely eliminate the coagulation and hardening of mortar powder.

Therefore, the furnace wall can be repaired uniformly and quickly, which has a great effect on preventing cooling of the furnace body and thus extending the life of the furnace.

Furthermore, this effect remains the same even with finely powdered materials having a particle size of about 0.5 mm or less, so the range of application of the material is expanded and it is also possible to improve the adhesion to the furnace wall by making the particles atomized.

■ Since the power source is only an air compressor, the structure is simple, difficult to break down, easy to operate, maintain and inspect, and has great economic effects.

Furthermore, since it can be made smaller and lighter, it can be easily moved to the repair location.

■ Since mortar powder and water are transported separately to the tip of the nozzle, there is no risk of mortar solidifying inside the nozzle even if repairs are performed in a high-temperature furnace.

It exerts various effects such as

[Brief explanation of the drawing]

Figures 1 to 3 show conventional mortar spraying equipment, Figure 1 is a wet type spraying machine, Figures 2 and 3 are examples of dry type spraying machines, and Figure 4 is a diagram showing an example of a dry type spraying machine. FIG. 5 is an enlarged sectional view of the nozzle portion connected to the numerals 17 and 25 in FIG. 4. DESCRIPTION OF SYMBOLS 1...Mortar tank, 2...Mortar liquid, 3...Pressure gauge, 4...Dish plate, 5...Mortar powder, 6...
Air motor, 7...Water, 8...Butterfly valve,
9...Aquarium, 10°13, 14.18...Valve, 11
... Drain pipe, 12 ... Air pipe, 15 ... Pressure reducing valve, 16 ... Pinch valve, 17 ... Mortar pipe, 1
9...Air pipe, 20...Ejector nozzle, 21,
27... Elastic hose, 22... Spray nozzle, 23.
...Pressure gauge, 24...Safety valve, 25...Water pipe, 26
... Water stop valve, 28 ... Water flow control valve, 29 ... Drain pipe, 30 ... Connection pipe, 31 ... Wheels, 32 ... Loading platform, 33 ... Top.

Claims (1)

[Scope of utility model registration request] A pressurized air pipe with air blowing holes is inserted from the outside to near the bottom of the powder mortar tank at the tip and at multiple locations near it, and the valved discharge port provided at the bottom of the mortar tank leads to the mortar spray nozzle. Mortar spraying for furnace wall repair, characterized in that a compressed air pipe is connected in the middle of the mortar transport pipe and an ejector nozzle is disposed at the connection part, and a pressurized water pipe is connected to the tip of the mortar spray nozzle. Device.