JPH05133695A - Removing method of soot in heat transfer tube for waste gas boiler - Google Patents

Abstract

PURPOSE:To prevent excessive adhesion and/or accumulation of soot as well as the generation of big trouble such as the fusing damage of a heat transfer tube and the like by burning the soot, adhered and/or accumulated on the outer peripheral surface of the heat transfer tube, forcibly. CONSTITUTION:An electric wire for heating 2 is attached to the predetermined place of the outer peripheral surface of a heat transfer tube 1 in a waste gas boiler installed on a ship, for example, straightly along the longitudinal direction of the tube 1 as the burning device of soot. When an electric current is conducted periodically through the electric wire for heating 2, the soot, adhered to and/or accumulated on the outer peripheral surface of the heat transfer tube 1, is removed and a state, in which the soot which can not be removed like as so far is accumulated excessively, can be eliminated. On the other hand, the soot is burnt and, therefore, the soot which can not be utilized so far, can be utilized as the heat source of the waste gas boiler and the discharging smoke of the boiler can be cleaned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing soot adhering to and depositing on the outer peripheral surface of a heat transfer tube of an exhaust gas boiler.

[0002]

2. Description of the Related Art Conventionally, soot that adheres to and accumulates on heat transfer tubes (especially fin tubes) of an exhaust gas boiler that uses exhaust gas of an internal combustion engine as a heat source, for example, an exhaust gas boiler (also called an exhaust gas economizer) of a ship is removed. In this case, it was done by blowing high-pressure steam or air.

[0003]

However, according to the above-described conventional removal method, it is difficult to completely remove the soot that has adhered and accumulated on the outer peripheral surface of the heat transfer tube.
There is a problem that it is necessary to regularly wash with water, and if the soot that cannot be removed is excessively deposited and ignites and burns, the steel heat transfer tube may be melted in some cases.

Therefore, an object of the present invention is to provide a method for removing soot in a heat transfer tube of an exhaust gas boiler which can solve the above problems.

[0005]

In order to solve the above-mentioned problems, the method for removing soot in the heat transfer tube of the exhaust gas boiler of the present invention is a method of forcibly burning the soot adhering to and depositing on the outer peripheral surface of the heat transfer tube. is there.

[0006]

[Function] According to the above soot removal method, the soot that adheres and accumulates on the outer peripheral surface of the heat transfer tube is combusted compulsorily, so it is possible to ensure that excessive soot adheres and accumulates that causes a major accident. Can be prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a heat transfer tube in an exhaust gas boiler provided on a ship, for example, and a heating wire (for example, a nichrome wire) 2 is provided at a predetermined position on the outer peripheral surface thereof in a longitudinal direction thereof as a soot burning device. Mounted straight along. As shown in FIG. 2, insulating materials 3 are provided at predetermined intervals at a plurality of appropriate positions of the heating electric wire 2 to prevent the heat from escaping to the boiler water side flowing through the heat transfer tube 1. Has been done.

In the above structure, when a current is periodically applied to the heating wire 2 attached to the outer peripheral surface of the heat transfer tube 1, the soot adhering to and depositing on the outer peripheral surface of the heating wire 2 is combusted compulsorily. Since the soot that adheres to and accumulates on the outer peripheral surface is removed, the situation of excessive soot that could not be removed as in the conventional case is eliminated.

By the way, in the first embodiment,
The heating wire 2 was attached to the heat transfer tube 1 in a straight line.
As shown in, it may be spirally wound.
Further, in the first embodiment described above, the case of applying to a bare tube type heat transfer tube has been described, but as shown in FIG. 4, in the case of the finned heat transfer tube 11, fins attached to both sides are used. A heating wire 13 is linearly attached to a portion between the two.

Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, a discharge device (spark generator) is used as a soot burning device.

That is, an electrode 22 is arranged on the outer peripheral surface of the heat transfer tube 21 of the exhaust gas boiler, and the electrode 22 and the heat transfer tube 2 are arranged.
A voltage is applied between the heat transfer tubes 1 and 1, and sparks are generated by the discharge, so that the soot adhering to and depositing on the outer peripheral surface of the heat transfer tube 21 is burned.

Further, as shown in FIG. 5, the protrusion 21a is provided on the surface of the heat transfer tube 21 to facilitate ignition. The electrode 22 may be set to the positive side and the heat transfer tube 21 side may be connected to the negative side. Of course, conversely, the electrode 22 may be set to the negative side and the heat transfer tube 21 may be connected to the positive side.

Further, the electrode 22 side may be moved along the outer peripheral surface in the axial direction of the heat transfer tube 21 (indicated by arrow a in FIG. 5). In this way, the heat transfer tubes 1, 11, 2
The soot that has adhered and accumulated on the outer peripheral surface of No. 1 is the electric wire for heating 2, 13
Alternatively, a spark generated between the electrode 22 and the electrode 22 combusts it compulsorily, so that excessive attachment and accumulation of soot can be prevented, and thus a serious accident such as melting damage of the heat transfer tube can be prevented. it can.

As described above, since the soot is burned, the soot, which has been useless in the past, can be used as a heat source for the exhaust gas boiler, and the smoke is also cleaned.

[0015]

As described above, according to the soot removing method of the present invention, the soot adhered / accumulated on the outer peripheral surface of the heat transfer tube is forcibly combusted, so that the excessive soot adhesion / accumulation is prevented. Therefore, it is possible to prevent the occurrence of a serious accident such as melting loss of the heat transfer tube.

[Brief description of drawings]

FIG. 1 is a perspective view of relevant parts for explaining a soot removing method according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a heat transfer tube in the first embodiment.

FIG. 3 is a perspective view of a main part for explaining a soot removing method according to a modified example of the first embodiment.

FIG. 4 is a perspective view of a main part for explaining a soot removing method according to a modified example of the first embodiment.

FIG. 5 is a side view of essential parts for explaining a soot removing method according to the second embodiment of the present invention.

[Explanation of symbols] 1,11,21 heat transfer tube 2,13 heating wire 22 electrode

Claims (1)

[Claims] 1. A method of removing soot in a heat transfer tube of an exhaust gas boiler, which comprises combusting soot that has adhered and accumulated on the outer peripheral surface of the heat transfer tube.