JPS6111596A - Removal of clinker layer - Google Patents

Abstract

PURPOSE:To shatter and remove the clinker layer efficiently and prefectly by employing expansion-shattering agent. CONSTITUTION:A hammer drill 5 rotates and vibrates a drill tip 6 thereby drilling the clinker layer 4 easily. A predetermined number of holes 6 are formed on the clinker layer 4, thereafter, these holes 6 are filled with the expansion shattering agent. Then, water is applied to the shattering agent and these holes 6 are left as they are for a predetermined hours (24hr for example). The clinker layer may be shattered by the expanding force of the shattering agent, therefore, the shattered clinker is removed and the removal work is finished. Here, the expansion shattering agent is consisting of silicate mineral containing about 50% of CaO and is produced by sintering after adding SiO2, CaSO4 or the like other than CaO.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for removing a clinker layer firmly attached to the inner surface of a boiler.

<Prior art and its problems> For example, in large industrial boilers such as large boilers for power plants, dust carried along with combustion gas adheres to the inner wall surface of the boiler in a high-temperature molten state. In particular, as shown in FIG. 3, on the floor surface 3 at the top of the boiler where the heat exchanger tube groups 1 and 2 such as a superheater and a reheater are arranged, tarinka adheres and accumulates to form a clinker layer 4. This clinker layer is the floor surface 3
It must be removed because it impedes heat transfer to the water pipe walls that form the boiler, but if the boiler is stopped and the removal work is carried out, it will harden like concrete. For this reason,
Removal work is very difficult and requires a worker who has entered the boiler to manually crush and remove using a drill, hammer, etc., and the removal work takes a long time. In the case of human-shaped boilers for power plants, every 1 unit of boiler operation stoppage on -day results in a loss of tens of millions of yen in electricity charges, so there is an urgent need to improve the efficiency of the talin force removal work. Furthermore, considering the fact that a large amount of dust is scattered around the Tallinn force and the work is carried out several meters above the ground, manual fragmentation removal work is dangerous and unsanitary. In some cases, there is also a risk that the floor surface, which is the wall of the water pipe, may be damaged during the crushing operation.

<Means to Solve the Problems> This invention is constructed in view of the problems mentioned above, and is capable of efficiently removing the clinker layer without damaging the boiler floor surface. It's a method.

<Summary of Means> In short, the present invention is a method for efficiently and safely crushing and removing a clinker layer using an expanding crushing agent.

<Example> Embodiments of the present invention will now be described with reference to the drawings.

In Fig. 1, the reference numeral 5 indicates -1- of the floor surface 3, which is the water pipe wall.
This is a hammer drill for forming a hole 6 for disposing an expanding crushing agent on the clinker layer 4 that has grown. This hammer drill rotates and vibrates the drill tip 6 to facilitate drilling into the clinker layer 4. In this case, if the tip of the drill comes into contact with the floor surface, there is a risk of damaging the water pipe, so a means to prevent this should be provided. Specifically, the configuration is such that the distance between the drill body 5 and the floor is measured by emitting ultra-14 waves 7, and the drill is stopped before the tip of the drill comes into contact with the floor. Another example is to tighten the tip of the drill and hold it at a set height, and then set the drill descent distance to be smaller than the set height. 7#if may be prevented from coming into contact with the tube body 3. After a predetermined number of holes 6 are formed in the clinker layer 4 by the above method, an expanding crushing agent is poured into the holes 6. Expandable crushing agents are available in powder form and solid rod-shaped ones, but in the case of rod-shaped crushing agents, holes 6 are formed to attach the crushing agent 9 to the drill body 5 via a chuck 8. If so, a crushing agent 9 may be inserted into this hole. Once the crushing agent 9 has been placed in all the holes, water is added to the crushing agent to expand it, and the crushing agent is left for a predetermined period of time (for example, day and night). Since the clinker layer is crushed by the expansion force of this crushing agent, the work is completed by removing the crushed clinker. Therefore, it is not necessary for the worker to enter the boiler except when operating a drilling machine such as a hammer drill and disposing the crushing agent in the hole, so the work can be greatly reduced and it is also safe.

Here, the expanding crushing agent is a silicate mineral containing approximately 50% OaO, and includes 5j-(h) in addition to cao.

It is formed by adding 0a304 or the like and sintering it.

Expansion is caused by injecting water into this crushing agent, and the expansion is caused by the pressure during the crystal growth period of Oa (OH) 2 formed by the hydration reaction of OaO. This pressure is 100Kg/. Since the clinker layer has a tensile strength of about 20 to 30 m, it is easily crushed.

Note that if the holes in the clinker layer are not only perpendicularly perpendicular to the floor surface but also formed in a fine manner as shown in Fig. 2, the expansion force before crushing will act as shown by the arrow, causing the clinker layer to peel off from the floor surface 3. ”: Can be crushed 1. The clinker layer can be removed more effectively.

Effect> By carrying out the present invention, it is possible to safely, reliably and quickly remove a strong clinker layer attached to a boiler.

In addition, almost no noise is emitted during crushing, and there is no risk of noise pollution.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the state of perforation in the clinker layer, FIG. 2 is a sectional view of the clinker layer showing another embodiment, and FIG. 3 is a partial sectional view of the boiler showing the state of formation of the clinker layer. 3... Boiler floor surface 4... Clinker layer 6... Hole 9... Expanding crushing agent Fig. 3 σ]

Claims (1)

[Scope of Claims] 1. A hole is formed in the clinker layer that has adhered and solidified in layers on the inner surface of the combustion device, and an expanding crushing agent is placed in the hole, and the expansion force of the expanding crushing agent is A clinker layer removal method characterized by crushing the clinker layer. 2. The clinker layer removing method according to claim 1, wherein the hole is formed obliquely with respect to the inner surface of the combustion device.