JP2715269B2 - Waterproofing method for fire-resistant walls using paint-like filler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention mainly relates to a gap generated due to a crack generated in a fire-resistant wall around the heat transfer surface of a combustion chamber of a boiler or an incinerator or a deterioration caused by expansion and contraction of expansion joint material. Waterproofing fire-resistant walls using paint-like filler
It concerns the processing method .

[0002]

2. Description of the Related Art Heat transfer surfaces of combustion chambers such as boilers and incinerators for land and ships (tubes receiving radiant heat generated by combustion,
There are radiant heat transfer surfaces such as drums, contact heat transfer surfaces such as pipes that contact and transfer heat to combustion gas, etc.), and fire-resistant walls made of fire-resistant bricks and refractory materials in the combustion chamber. Incinerated ash, slag, soot, etc. Adheres. When such incineration ash or the like adheres to the heat transfer surface or the refractory wall, not only does the thermal efficiency decrease, but also the combustion chamber and the pipes overheat, causing many problems.

[0003] Therefore, conventionally, periodically or whenever incinerated ash or the like has adhered, it has been removed by a scraper or the like. However, recently, attention has been paid to the water soaking method in consideration of dioxin countermeasures.

However, the water soaking method uses high-pressure water, so that the cleaning efficiency is improved, but water or acid-containing water penetrates the refractory wall from its surface, causing erosion and corrosion. That is, the refractory wall impregnated with water expands and becomes brittle due to the heat of combustion, and is easily broken, and the refractory wall is corroded by the water containing acid. For this reason, the durability of the refractory walls is greatly reduced, and the cost for repairing them is increased.

In order to solve the problem of the water soaking method, the applicant of the present application has proposed to prevent erosion and corrosion of the fireproof wall due to penetration of water at the time of washing when applied to the fireproof wall of the combustion chamber. Thus, a waste oil emulsion paint capable of improving its durability has been proposed (see Japanese Utility Model Application No. 4-317127).

[0006] This waste oil emulsion paint is obtained by adding a surfactant and water to a mineral oil waste oil and stirring the resulting mixture to add a residual paste of a color paste for printing based on a synthetic resin emulsion and carboxymethyl cellulose. It is made by adding.

[0007] This paint is applied by spraying it onto a fire-resistant wall of a combustion chamber with a spray gun for painting, and if left at room temperature, the surface hardens in about 2 hours, and after half a day or one day, waste oil does not exude. It becomes a strong waterproof coating.

For this reason, even if the water-cooled wall pipes and the water pipe group are washed with the water soaking method, water or acid-containing water does not penetrate into the fire-resistant wall, and the problem of erosion and corrosion of the fire-resistant wall due to these does not occur. .

[0009]

However, at this time, water (pH 5 to 6) containing water or acid at the time of washing enters the cracks formed in the fire-resistant wall and the gaps formed in the expansion joints, and the fire-resistant wall is damaged. Wetting, the problem that the wet fire wall expands and breaks due to the heat of combustion, or water enters the gap between the water cooling wall tube and the fire wall, the fire wall is similarly eroded, and the water wall tube also corrodes. It turned out that such a problem would occur.

[0010] The causes of the cracks are considered as follows.

(1) There is a difference in the coefficient of thermal expansion between the refractory brick and the refractory wall or the water cooling pipe.

(2) Local stress is generated on the refractory wall.

(3) Slag adheres to the surface of the refractory wall to partially form a deteriorated layer.

(4) Condensation generated after the combustion chamber is stopped (p
H2) erodes the refractory wall.

The cause of the above-mentioned gap is as follows.
The following can be considered.

(1) The expansion joint material such as ceramic fiber rope and ceramic cloth filled in the expansion joint provided between the refractory brick wall and the irregular refractory wall or on the irregular refractory wall is deteriorated.

(2) The expansion joint material falls off due to vibration, earthquake, or the like.

Incidentally, in order to prevent water from entering into cracks and gaps generated in the fire-resistant wall, it is conceivable to apply the previously proposed "waste oil emulsion paint". However, this paint is not suitable for closing cracks and gaps in view of its properties like general paint, and a sufficient blocking effect cannot be expected.

The present invention has been made in order to solve the above-mentioned problems. When the cracks or gaps generated in the fire-resistant wall of the combustion chamber are filled, the erosion of the fire-resistant wall due to the intrusion of water at the time of rinsing may be performed. it is possible to prevent corrosion, thus, an object of the invention to provide a waterproofing method for a refractory wall using paint-like filler can be improved durability.

[0020]

Means for Solving the Problems A paint provided by the present invention
The waterproofing method of fire-resistant wall using the shape filler is boiler and
When washing the heat transfer surface of the combustion chamber of an incinerator etc.
Cracks on the refractory wall of the side
Is filled with paint-like filler in advance.
You.

The filling method is as follows.
Select the method of insertion and the method of pushing with a spatula as appropriate.
Can be.

The paint filler used in the present invention is prepared by mixing obsidian foam particles with an acrylic resin emulsion paint or waste oil emulsion paint.

As the acrylic resin-based emulsion paint, a styrene-acryl copolymer resin paint is particularly preferred from the viewpoints of alkali resistance, quick drying, and mixing of obsidian foam particles. If the refractory wall on site is very dry, a vinyl acetate / acrylic copolymer resin paint may be used. Rubber-based resin paint can be used,
It is not preferable because black smoke is generated at the time of reignition combustion.

As the waste oil emulsion paint, there can be used a paint prepared from a waste oil of mineral oil, which was proposed by the present applicant in Japanese Patent Application No. 4-317127. That is, the waste oil emulsion obtained by adding a surfactant and water to the waste oil of mineral oil and stirring,
A waste oil emulsion paint obtained by adding a residual paste of a color paste for printing based on a synthetic resin emulsion and carboxymethyl cellulose can be used.

A point to be noted in converting waste oil into a paint is to make the solvent in the waste oil paint gaseous and water-soluble so that the gas does not fill the boiler.

For this purpose, the following processing is required.

The waste oil is emulsified.

In order to give the emulsified waste oil a coating property, a synthetic resin emulsion is added.

In the paint of the mixture prepared by the above-mentioned treatment, oil may ooze out after the formation of the dried coating film. Therefore, the residual paste of the color paste for printing based on carboxymethylcellulose used for printing fibers is used. Is blended.

This residual glue is compounded because carboxymethyl cellulose is a synthetic product from sulfite pulp.
This is because the oil has a property of adsorbing the oil well, fixing the oil in the dried paint, stabilizing the oil, and accelerating the drying of the paint.

The particle size of the obsidian foam particles is 1.0 mmφ.
The following is preferable in terms of the filling property of the filler, but it is possible to select a filler having a larger particle size in accordance with the size of cracks and gaps.

[0032]

(1) When the acrylic resin-based emulsion paint or waste oil emulsion paint is applied to a fire-resistant wall of a combustion chamber, it adheres well to the fire-resistant wall paint.
Tack and is within 30 minutes, solidified after elapse to no half day 1 day to form a strong waterproof the film.

The paint-like filler used in the present invention is obtained by mixing the above-mentioned emulsion paint as a binder with obsidian foam particles as an extender, so that it can be easily filled into cracks and gaps in a fire-resistant wall. When the emulsion paint solidifies, a waterproof wall that fills the cracks and gaps can be formed.

Therefore, even if the combustion chamber is washed with a water soaking method or the like, water or acid-containing water does not enter through cracks or gaps in the fire-resistant wall, thereby causing erosion and corrosion of the fire-resistant wall. Disappears.

(2) The waterproof coating formed on the refractory wall is burned by heat (around 800 ° C.) due to incineration of refuse in the combustion chamber, and there is no problem of post-treatment.

[0036]

1 and 2 show an embodiment of the present invention.
It is explained while citing. FIG. 1 is a perspective view illustrating a fireproof wall of a combustion chamber to an incinerator, and FIG. 2 is an enlarged view of a main part of FIG.

In the figure, 1 is a refractory brick wall, 2, 3,
Reference numeral 4 denotes an irregular refractory wall, and reference numeral 5 denotes a water-cooled tube. Reference numeral 6 denotes an elastic joint material filled in the joint between the irregular refractory walls 2, 3, and 4, reference numeral 7 denotes an elastic joint material filled in the joint between the refractory brick wall 1 and the irregular refractory walls 2, 3, and 8 denotes water cooling. It is an expansion joint material filled in the joint between the pipe 5 and the irregular-shaped refractory wall 2.

K is a refractory brick wall 1 and an irregular refractory wall 2,
Cracks generated in 3 and 4. g is expansion joint material 6,7,
8 is a gap generated between the joints 6, 7, 8 and the joint due to deterioration of the joint 8. FIG. 2 shows these gaps g.
The gap g generated between the elastic joint material 6 and the joint 9 is shown as a representative example.

Sludge and soot adhering to the refractory walls 1-4 of the combustion chamber must be removed at the time of inspection.

The paint-like filler used in Examples 1 to 3 is a material that fills the cracks k and the gaps g when removing the deposits (sludge and soot) by a water soaking method using high-pressure water. .

In the water washing by the water soaking method, the above-mentioned paint-like filler is filled in the cracks k and the gaps g to form a waterproof wall, and a waste oil emulsion paint or a water-soluble synthetic resin paint is coated on the surfaces of the fireproof walls 1 to 4. It is performed after coating to form a waterproof coating.

Example 1 2 L of obsidian foam particles having a particle size of 1.0 mm or less and 1 L of a styrene / acrylic copolymer resin paint were stirred and mixed to prepare a paint filler.

This filler was filled with a spatula into the cracks k and gaps g at the time of periodic inspection.

On the other hand, on the surfaces of the refractory walls 1 to 4, a waste oil emulsion paint was applied.

As the waste oil emulsion paint, engine oil, bilge oil, cutting oil and turbine oil are mixed with a surfactant in a ratio of 5: 1, and water is added to the mixture.
35 g of a stock solution emulsified by adding styrene / acrylic copolymer resin emulsion 110
g, 35 g of water and 20 g of waste color paste were mixed, and the mixture was stirred for 5 minutes and used.

When the filler and the waste oil emulsion paint were dried, the state of formation of the coating film was confirmed. As a result, no shrinkage or cracking due to drying was observed. Then, when the refractory walls 1 to 4 were washed with water by the water soaking method, no peeling of the filler and the paint was observed during the operation, and the penetration of the water into the refractory walls, as well as the water to the cracks k and the gaps g. No infiltration was observed.

Example 2 2 liters of obsidian foam particles having a particle size of 1 to 1.5 mm and 1 liter of a styrene / acrylic copolymer resin paint were stirred and mixed to prepare a paint-like filler.

This filler was filled with a spatula into the crack k and the gap g at the time of periodic inspection.

On the other hand, the waste oil emulsion paint used in Example 1 was applied to the surfaces of the refractory walls 1 to 4.

When the filler and the waste oil emulsion paint were dried, the coating film was confirmed in the same manner as in Example 1 and washed with water by a water soaking method. The same results as in Example 1 could be obtained. Was.

Example 3 1 liter of obsidian foam particles having a particle size of 1 to 1.5 mm and 1 liter of waste oil emulsion paint were mixed and stirred to prepare a paint-like filler.

As the waste oil emulsion paint, 70 parts of an acrylic copolymer, 10 parts of mineral oil waste oil,
And 10 parts of water were mixed and stirred.

This filler was filled with a spatula into the cracks k and gaps g at the time of periodic inspection.

On the other hand, the surface of the refractory walls 1 to 4
The waste oil emulsion paint used in the above was applied.

When the filler and the waste oil emulsion paint were dried, the coating film was confirmed in the same manner as in Example 1, and washed with water by a water soaking method. The same result as in Example 1 could be obtained. Was.

[0056]

As described above, according to the present invention, since the above-described structure is employed, a waterproof wall is formed in a crack or a gap formed in a fire-resistant wall of a combustion chamber to prevent water from entering during washing. Erosion and corrosion of the refractory wall can be prevented, and therefore, its durability can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a fire-resistant wall having cracks or gaps filled with a paint-like filler of Examples 1 to 3.

FIG. 2 is an enlarged front view of a main part of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refractory brick wall 2,3,4 Irregular refractory wall 5 Water-cooled wall pipe 6,7,8 Elastic joint material 9 Joint k Crack g Gap

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-55-118980 (JP, A) JP-A-63-295683 (JP, A) JP-A-5-43822 (JP, A) JP-A 55-118 65284 (JP, A)

Claims (1)

(57) [Claims] Claims: 1. During washing and cleaning of a heat transfer surface of a combustion chamber such as a boiler or an incinerator, a crack generated in a fire-resistant wall around the heat transfer surface or a gap generated by deterioration of a joint material of the fire-resistant wall is required. Paint-like filler made by mixing obsidian foam particles and acrylic resin emulsion paint or waste oil emulsion paint,
A method for waterproofing a fire-resistant wall using a paint-like filler, which is pre-filled.