JPS63289091A - Nozzle for hot spraying repair of c gas passageway etc. of coke oven regenerator - Google Patents

Abstract

PURPOSE:To provide the title nozzle which is suited for hot spraying repair of the wall surface very close to a nozzle discharge opening and which comprises a nozzle, a coupling and an air blowout aperture each disposed in particular configuration and arrangement. CONSTITUTION:A repairing material supplied from a watering 8 and pressure fed from a sprayer 1 by means of a pneumatic conveyer 4, together with water, is introduced into a T-shaped nozzle 7 for padding repair and blown out from an below-formed coupling 10, which is inserted through the peripheral wall of a cylindrical nozzle 9 having at one end thereof a discharge opening 9a and having the other end blocked by a mirror wall 9b and has an opening disposed toward the mirror wall 9b. The blown repairing material and water hit the mirror wall 9b, are mixed together and reverse their direction. This reversion of direction lowers spraying pressure, thereby avoiding the scattering of the repairing material to environment by spraying pressure. On the other hand, the repairing material which is likely to drop from the discharge opening 9a due to lowering of spraying pressure is blown toward the surface to be sprayed by means of the compressed air fed through an air blowout aperture 13 disposed around the discharge opening 9a.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a nozzle for hot spray repair of a regenerator C gas passage of a coke oven, etc., and particularly for hot spray repair of a wall surface near the discharge port of the nozzle. The present invention relates to a hot spraying nozzle suitable for repairing a heat storage chamber C gas passage of a coke oven.

[Prior art and its problems]

For example, when hot spraying repairs are made to the heat storage chamber C gas passageway (also called C gas canal) of a coke oven, it is necessary to insert a nozzle that blows out the repair material into the C gas canal through a narrow square hole of about 180 m x 50 m. The atmospheric temperature inside the C gas canal is operated at 600°C or higher. Further, the C gas canal itself is formed narrowly, and the distance between the wall surface on which the repair material is sprayed and the nozzle is about 120 fi at most.

Furthermore, it is almost impossible to visually observe the wall surface (sprayed surface) being repaired.

For this reason, it is necessary that the following conditions (1) to (4) be satisfied when performing hot spray repair of the C gas canal. In other words, (1) The spraying machine must be easy to operate and capable of stable spraying work.

(2) Since the spraying distance is short, the spraying pressure reduces the escape of the spraying material to the surrounding area, and also eliminates so-called nozzle droop, where the spraying material drips and falls from the tip of the nozzle.

(3) The spraying area is small and visual confirmation is difficult, so the adhesion rate of the spraying material is high.

(4) The repair material should have good adhesion to the chamotte refractory of the coke oven, penetrate well into 5 fl joints, and have gas sealing properties.

It is necessary that the following conditions are met.

By the way, in order to satisfy the above condition (1), in the past, the discharge amount of material was stable, there was no nozzle clogging,
A wet spraying method is used to achieve a high adhesion rate. However, this method has the problem that the amount of water added to the material is 20% or more, and the spraying pressure cannot be increased because the spraying distance is short, resulting in significant nozzle stiffness.

In this wet spraying method, if the spraying pressure is increased to prevent nozzle droop, there is a problem in that the material is blown away to the surrounding area by the spraying pressure, making overlay repair impossible. Moreover, in this wet spraying method, when repairing joints, the repair material flies out of the joints together with air, making it impossible to properly fill the joints with the repair material. Furthermore, since the water content of the sprayed material is more than 20%, the porosity of the construction body is also 42%.
%, and the bulk specific gravity is, for example, 1.8, which poses problems in terms of physical properties.

Therefore, prior to the present invention, the present inventors invented a method of solving the above-mentioned problems of the conventional technology by adopting a dry spraying method in which the discharge amount of material is stable. A conventional hot spray repair nozzle constructed as follows was used.

That is, this conventional hot spray repair nozzle is composed of a nozzle joint and a cylindrical nozzle mouthpiece connected to the nozzle joint in an elbow shape.

In the dry spraying method using such conventional hot spray repair nozzles, the spray pressure is too strong for overlay repair, and the material is blown away to the surrounding area, making overlay repair impossible. It turns out that there is a problem. In addition, it has been found that in the dry spraying method using the conventional spray repair nozzle, if the spraying pressure is weakened, nozzle leakage is likely to occur.

The present invention has been made in consideration of the above circumstances, and is suitable for hot spraying repair of a wall surface near a nozzle discharge port, such as a heat storage chamber C gas passage of a coke oven. The purpose is to provide a nozzle for

[Means for solving problems]

In the hot spray repair nozzle for the regenerator C gas passage of a coke oven according to the present invention, the following technical measures are taken to achieve the above object.

That is, a cylindrical nozzle nozzle having a discharge port at one end and a mirror wall closing the other end, and an elbow-shaped joint penetrating the peripheral wall of the nozzle nozzle and opening toward the mirror wall. On the other hand, an annular air jet opening is provided around the discharge opening.

[Effect]

In the dry spraying method, the repair material is conveyed by compressed air from, for example, a Franks feeder to a nozzle, and water is added to the repair material just before the joint. Then, the repair material and water blown out from the joint to the nozzle cap hit the mirror wall of the nozzle cap and mix well, and then their direction is reversed. With this reversal, the spraying pressure is weakened and the repair material is sprayed softly from the discharge port onto the spraying surface, so there is almost no blowing or escape of the repair material to the surrounding area due to the spraying pressure, making it possible to perform overlay repairs. Become. In addition, there is a risk of nozzle damage due to a decrease in spray pressure, but the repair material that is about to drip from the nozzle outlet is directed toward the spraying surface by the compressed air that is ejected from the air outlet around the outlet. As a result, the nozzle droop hardly occurs.

The repair material is not particularly limited as long as it has good adhesion to the chamotte refractories of coke ovens, can sufficiently penetrate into narrow joints of, for example, 5 liters, and has gas sealing properties. For example, a mixture of aggregate, a binder or a strength improver, and an adhesion prevention material can be used.

The aggregate is not particularly limited as long as it is an alumina-silica type chamotte aggregate, and it is also possible to use alumina or silica containing fused silica alone depending on the place of use.

The particle size of the aggregate is preferably 11 or less in consideration of adhesion rate and joint thickness. If the particle size exceeds 1 grain, penetration into joints will be insufficient and adhesion to walls will also deteriorate, which is not preferable. Although the particle size distribution of the aggregate is not particularly limited, the best results have been obtained with a particle size distribution in the following range.

1000~350μm 30~40%350~74
μm 20-30% 74 μm or less 35-45% Outside this range, it has been observed that the adhesion rate decreases and overlay construction becomes difficult.

The binder or strength improver is not particularly limited as long as it is used for refractories using alumina-silica aggregate, such as ultrafine silica powder (micro silica) and water glass. is used.

It is preferable to add 1 to 10% of microsilica having a particle size of 2 μm or less. If it exceeds 10%, the volumetric stability in hot conditions becomes low and shrinkage cracks occur, which is not preferable.

Further, if it is less than 1%, the adhesive strength becomes insufficient, and adhesion and workability deteriorate significantly, which is not preferable.

It is preferable to add water glass in an amount of 1 to 8%.

If it is less than 1%, sufficient strength cannot be obtained, so it is not preferable, and if it is more than 8%, it is not preferable because shrinkage is large and adhesive strength is reduced.

Calcium (Ca) or a compound containing calcium can be used as the adhesion prevention material. As a calcium source, slaked lime, calcium acetate, calcium chloride, etc. can be used. Among these calcium sources, it is recommended to use slaked lime, which is the cheapest.

The amount of slaked lime used as an adhesion prevention material is 0.
1 to 1% is preferred. If it is less than 0.1%, the effect of preventing drooping will not be exhibited, which is undesirable, and if it is more than 1%, a popping phenomenon will occur during hot spraying, resulting in poor workability, which is not preferred.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First, the configuration of the C gas canal hot spray repair apparatus will be schematically explained with reference to FIG.

In this hot spraying repair device, the repair material is stored in a dry powder state in a hopper 2 of a spraying machine 1, and is taken out from the hopper 2 in an arbitrarily adjusted supply amount by a quantitative supply device 3. 4, the sprayer 1 is forced to feed the spray to the nozzle 5.

Although the spraying machine 1 is not particularly limited, here, a small amount variable discharge type table feeder and a cutting type flux feeder are used.

The nozzle 5 includes a support culm 6 and a nozzle body 7 that is removably fixed to the tip of the support culm, and a dry powder repair material and water are added to the tip of the support culm 6 in an arbitrary ratio. A water ring 8 is provided.

The nozzle body 7 is the one shown in FIG. 1 (hereinafter referred to as a T-shaped nozzle and indicated by the reference numeral 7), and the one shown in FIG.
Two types of nozzles are available: the L-shaped nozzle (indicated by the symbol 7°), and the T-shaped nozzle when repairing the wall of the C gas canal.
The nozzle 7 is used, and the L-shaped nozzle 7° is used when repairing the joint of the C gas canal.

As shown in FIG. 1, the T-shaped nozzle 7 includes a cylindrical nozzle cap 9 having a discharge port 9a at one end and a mirror wall 9b at the other end, and a peripheral wall 9c of the nozzle cap 9. It has an elbow-shaped joint 10 penetrating therethrough and opening toward the mirror wall 9b.

The ratio of the diameter of the opening of the joint lO to the inner diameter of the base end of the nozzle mouthpiece 9 is approximately 1:1.70 (in terms of area ratio, l:2.8).
9).

The discharge port 9a of the nozzle cap 9 is formed in a tapered shape, and the ratio of the cross-sectional area of the flow path at the tip to the cross-sectional area of the flow path at the base end is approximately 30% (55% in terms of the aperture ratio). be. When the discharge port 9a is formed into a tapered shape in this manner, the pressure loss within the nozzle mouthpiece 9 can be reduced, which is advantageous in preventing the occurrence of nozzle droop and nozzle clogging.

An annular compressed air jet nozzle 1 is arranged around the discharge port 9a.
1 is provided. This compressed air jetting nozzle 11 receives compressed air from a compressed air source (not shown) via a joint 12 connected at an eccentric position, and has an annular opening around the tip of the discharge port 9a flush with this. The air is formed so as to be ejected from the air jet port 13 in a direction that converges on the axis of the discharge port 9a. If the air jet port 13 is configured to jet compressed air in a direction converging on the axis of the discharge port 9a of the nozzle base 9, it is possible to suppress the diffusion of the repair material discharged from the discharge port 9a. As well as being able to
This makes it possible to eliminate nozzle droop more reliably.

In addition, a threaded portion 10 that is screwed into a threaded portion 6a at the tip of the support ring 6 is provided at a portion of the joint 10 that protrudes from the nozzle cap 9.
a is formed.

The compressed air jetting nozzle 11 is connected to a compressed air source via a pressure reducing valve 14 common to the air conveying device 4, and the air conveying device 4 and the compressed air jetting nozzle 11 are connected to the compressed air source from the compressed air source. For example, compressed air supplied at 7 kgf/cot is reduced in pressure by the pressure reducing valve 14 to, for example, 5 kgf/cd and then supplied. The discharge pressure from the nozzle mouthpiece 9 is further reduced due to pressure loss within the air conveyance device 4, and becomes, for example, 3 kg f /cj. Further, the amount of the repair material discharged from the nozzle cap 9 is set to, for example, 1.3 kg/1IIin, and the water content of the repair material discharged from the nozzle cap 9 is, for example, 16.2%.
is adjusted to

The L-shaped nozzle 7' has a threaded part 6 at the tip of the support ring 6 at its base end.
It consists of a joint 15 having a threaded portion 15a that is screwed into the joint 15, and a nozzle cap 16 connected to the tip of the joint 15 in an elbow shape, and the discharge port 16a of the nozzle cap 16 is formed in a tapered shape. . The ratio of the cross-sectional area at the tip to the cross-sectional area at the base end of this discharge port 16a is approximately 60%.
(approximately 63% in terms of aperture ratio).

The tip of the discharge port 16a of the L-shaped nozzle 7'' may be formed in a circular shape, or may be formed in a flat rectangular shape, an elliptical shape, or the like.

Next, a procedure for hot spraying repair work on the side wall of a C gas canal using this hot spraying repair device will be explained.

Figures 4 to 6 show the locations where hot spraying repairs will be performed.

That is, FIG. 4 is a cross-sectional plan view of C gas canal, and FIG.
The figure is a vertical sectional view taken along line A-A in Figure 4, and Figure 6 is a vertical sectional view taken along B-BvA in Figure 4. The solid areas D and H are shown, and the joints to be repaired are shown with thick lines.

Spraying repairs are completed within 40 minutes, which is allowed by the process.
For example, after stopping the C gas, immediately remove the plug P, inspect the inside of the furnace 16 minutes later, and start spraying 21 minutes later. For repairs, first repair the joint using the L-shaped nozzle 7, and then use the T-shaped nozzle 7 to repair the wall surface. Approximately 19 minutes after the start of spraying (C
The spraying is completed 40 minutes after the gas is stopped, and the filling of the plug P is completed 46 minutes after the C gas is stopped. Incidentally, the distance between the spraying surface to be repaired and the discharge port 9a of the nozzle 7 was about 60 mm at most.

As a repair material, there are no particular limitations as long as it has good adhesion to the chamotte refractories of coke ovens, can sufficiently penetrate into narrow joints, for example, five dragons, and has gas sealing properties, but here, Microsilica with a particle size of 2 μm or less is added to the alumina-silica chamotte aggregate with a particle size of 1 to 10 μm as a binder or strength improver.
%, water glass is added in an amount of 1 to 8%, and slaked lime is added in an amount of 0.1 to 1% as an adhesion prevention material.

The particle size distribution of the above aggregate is 1000-350 μm for 34%
, 350 to 74 μm is 26%, and 74 μm or less is 40%. In addition, its chemical component is Ig.

1oss is 1.6, Sing is 50.3, A7! zoz
is 44.0, and Na and O are 1.4.

The details of spraying on the repaired area are as follows: For example, the spraying amount is 11
kg, extended spraying time 6 minutes, amount of spraying in the furnace 5 times, number of spraying in the furnace 5 times, rebound loss in the furnace 1. 1 kg, and the adhesion rate is 88%.

Although it was not possible to visually observe the sprayed area during the spraying process, observation after the spraying process showed that the adhesion was good and the targeted area had been repaired.

In the T-shaped nozzle 7 for overlay repair, the repair material and water blown into the nozzle mouthpiece 9 from the joint 10 hit the mirror wall 9b of the nozzle mouthpiece 9 and mix well, and then the direction is reversed. With this reversal, the repair material whose spray pressure is weakened is sprayed from the discharge port 9a onto the spraying surface, so that the repair material is hardly blown to the surrounding area by the spray pressure, and overlay repair can be easily performed. In addition, there is a risk that the nozzle may be damaged due to a decrease in spray pressure, but the repair material that is about to drip from the discharge port 9a of the nozzle cap 9 is removed by the compressed air jetted from the air jet port 13 around the discharge port 9a. The liquid is blown toward the spraying surface, and almost no nozzle droop occurs.

The sealing properties of the repaired C gas canals for 48 gates on the machine side were inspected using the following two methods. In other words, there is a method in which the gas concentration is measured by suctioning CO from the lower joint part of the carbonization chamber with a CO detection tube, and a method in which CO is measured from the upper part of the manhole in the heat storage chamber.
The sealing performance of the repaired C gas canal was inspected by measuring the gas concentration by suctioning with an O detection tube. As a result, leakage into the heat storage chamber was confirmed for 3 gates, but complete gas sealing was achieved for 45 gates.

Furthermore, after the repair began, the temperature was measured using an optical pyrometer through the combustion chamber peephole, and when compared with the temperature before the repair, it was confirmed that the temperature after the repair was higher. From this, it can be said that spray repair was effective in improving gas sealing performance.

In addition, according to the results of a separate experiment on repairing joints using a 7° L-shaped nozzle, it was possible to fill a joint with a depth of 230n and a width of 5mm to a depth of 230mm even with a discharge pressure of 2.5kgf/cm. This was confirmed.

In addition, when the above repair material (moisture content 16.2%) was sprayed on a refractory brick preheated to 150°C and then dried at 110°C, the porosity of the repaired area was 38.6% and the bulk The specific gravity is 1.67, and it has been confirmed that it has good adhesion to bricks.

Furthermore, in this embodiment, the water ring 8 is provided near the nozzle body 7.7゛, so the discharge characteristics are more stable than in conventional dry spraying, the water amount can be easily controlled, and the operation is simple. It is.

Furthermore, compared to flame gunning, the entire hot spray repair device is smaller and more compact, and can be easily moved. Moreover, since spraying can be performed in a short time, sufficient repairs can be made within a short time between coke oven operations. Furthermore, since no flammable gas is used, there is also the advantage of safety.

〔Effect of the invention〕

As described above, according to the hot spraying repair nozzle for the heat storage chamber C gas passage of a coke oven according to the present invention, the repair material is blown out from the joint toward the mirror wall of the nozzle mouthpiece and hits the mirror wall. The repair material and water are mixed and then ejected from the outlet on the opposite side of the mirror wall. The discharge pressure of the repair material is lowered due to the pressure loss caused by the collision with the mirror wall, so the repair material is hardly blown away or escaped to the surrounding area due to the spray pressure, and the gap between the discharge port and the spraying surface is narrow. It becomes possible to repair overlays in the heat storage chamber C gas passage of the furnace, etc. In addition, nozzle droop due to a drop in spray pressure is mostly caused by the fact that the repair material that is about to drip from the outlet of the nozzle cap is blown away toward the spraying surface by the compressed air that is ejected from the air outlet around the outlet. It will no longer occur.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a nozzle for hot spraying repair of the heat storage chamber C gas passage of a coke oven according to the present invention, Fig. 2 is a longitudinal cross-sectional view of an L-shaped nozzle for repairing joints, and Fig. 3 is a longitudinal cross-sectional view of the nozzle for hot spraying repair of the heat storage chamber C gas passage of a coke oven. A configuration diagram schematically showing the configuration of a gas canal hot spray repair device, FIG. 4 is a cross-sectional plan view of C gas canal, FIG. 5 is a compressed sectional view taken along line A-A in FIG. 4, and FIG. It is a longitudinal cross-sectional view taken along the line BB in the figure. In the figure, 9... Nozzle cap, 9a... Discharge port, 9b... Mirror wall, 10... Joint, 13... Air jet port. h-/T11 0 -1o 2 Illustration 4[ "1

Claims (2)

[Claims] (1) A cylindrical nozzle cap having a discharge port at one end and closed by a mirror wall at the other end, and an elbow-shaped joint penetrating the peripheral wall of the nozzle cap and opening toward the mirror wall. A nozzle for hot spraying repair of a heat storage chamber C gas passage of a coke oven, etc., characterized in that an air jet opening for jetting compressed air is opened around the discharge opening. (2) The coke oven according to claim 1, wherein the discharge port of the nozzle mouthpiece is formed in a tapered shape, and the air jet port is opened in a direction converging on the axis of the discharge port. Hot spray nozzle for repairing heat storage chamber C gas passages, etc.