JPH0518527A - Cleaning method for waste heat-recovering apparatus and cleaning apparatus therefor - Google Patents

Abstract

PURPOSE:To sharply attain energy and labor saving for cleaning each heat- transfer tube in a waste heat-recovering apparatus, by a method wherein the external surface of the heat-transfer tube is irradiated with solar rays through the ray outlet part of each solar ray-irradiating device, and soot adhering thereto is heated and burnt. CONSTITUTION:The bundle of solar rays collected by a solar ray collector 2 is sent to the ray outlet part of each solar ray-irradiating device 8 through an optical fiber cable 5. By a signal from a computer 12 for control, the solar ray-irradiating device 8 is inserted into an exhaust gas economizer 10 at a definite speed and the ray outlet part facing a heat-transfer tube is progressively shifted along the heat-transfer tube. On the other hand, through the ray outlet part formed to the top part of a cylindrical main body for the solar ray- irradiating device 8, the external surface of each of the heat-transfer tubes is continuously irradiated with solar rays sent through the optical fiber cable 5, and soot adhering to the external surface of the heat-transfer tube is heated and burnt, and thus the soot is removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a heat transfer tube of an inferior heat recovery device and an improvement of the cleaning device, which is mainly used in an exhaust gas economizer of a ship or the like.

[0002]

2. Description of the Related Art Conventionally, in exhaust gas economizers, exhaust gas boilers, and other devices for recovering stale heat, a method of injecting a medium such as steam or air, a method of spraying steel balls, or a low-frequency wave is used as a cleaning device for heat transfer tubes. A cleaning device such as a vibration applying method is put into practical use. However, in a marine diesel engine or the like in which low-quality heavy oil is frequently used as a fuel, a large amount of highly viscous soot dust is contained in the exhaust gas, and in the conventional cleaning device described above, It becomes difficult to remove the soot dust adhering to the heat transfer tube efficiently. That is, in the conventional cleaning device,
Although the attachment of soot to the heat transfer tube can be alleviated to some extent, its soot removing effect is limited, and the attached soot gradually grows. As a result, it is said that the fuel consumption of the main engine is increased due to the increase of the ventilation resistance (the increase of the draft loss), and in the worst case, so-called sootfire is caused to cause the melting loss of the heat transfer tube.

On the other hand, in order to avoid the above-mentioned troubles,
In the heat recovery device for ships, a measure is taken to regularly wash the heat transfer tubes of the heat recovery device while moored. However, when the heat transfer tube is washed with water, so-called sulfuric acid corrosion is unavoidable and there is a problem that the service life of the heat transfer tube is shortened. Further, there is a problem that the water washing work requires a lot of manpower and time, and labor saving and labor saving of the ship cannot be achieved. Furthermore, since a large amount of cleaning water is required in a large-scale scab, it is necessary to install a large-capacity storage tank for cleaning drainage inside the ship, which causes many restrictions on the fitting of the engine room. There are difficulties.

In reality, most of the existing water washing devices cannot completely clean the heat transfer tube in every corner due to the limitation of the washing time and the amount of washing water, and the soot adhering to the heat transfer tube is the surface. Only the oil content is washed away and the carbon component is exposed, which makes it extremely easy to catch fire.
As a result, when leaving the port after washing with water, soot is burned and blows out sparks from the chimney, or during the voyage, so-called soot burning (melting damage does not occur due to sparks flying from the supercharger outlet of the main engine). To some extent, the burning of adhered soot) occurs.

[0005]

SUMMARY OF THE INVENTION The present invention is difficult to effectively remove soot by the above-mentioned problems in cleaning the calorie recovery device, that is, in the conventional media injection or steel ball spraying type cleaning. Therefore, the increase of draft loss and the occurrence of soot fire, the difficulty of labor saving in cleaning with water washing method, the induction of corrosion, the need for a storage tank for cleaning drainage, etc. It aims to solve problems such as incomplete soot and easy occurrence of soot burning.It is possible to remove soot adhering to heat transfer tubes automatically with high efficiency and almost completely. The present invention provides a cleaning method and a cleaning device for a calorific heat recovery device capable of completely preventing the occurrence of soot burning and the like.

[0006]

Means for Solving the Problems The inventor of the present invention has conducted a cleaning test on a large number of devices for recovering the heat of soot by frequently forcibly inducing the combustion of the soot when a small amount of the soot adheres to the heat transfer tube. We have learned that the heat transfer tubes can be maintained in a clean state without causing any loss. The present invention was created based on the above knowledge, and the invention according to claim 1 makes it possible to freely insert and extract sunlight focused by a solar concentrator into an inferior heat recovery device through an optical fiber cable. Guided to the installed solar irradiation device, while irradiating the outer surface of the heat transfer tube with sunlight from the light emitting end of the solar irradiation device while the soot attached to the heat transfer tube is relatively small, the irradiation position is sequentially moved. Thus, the basic constitution of the invention is to continuously heat and burn the adhered soot.

The invention according to claim 3 of the present invention is a solar light concentrating device; and a solar light irradiating device having an output end portion of the solar light, which is arranged so as to be freely inserted into and removed from the inferior gas recovery device. An optical fiber cable connecting the solar concentrator and the output end of the solar irradiation device; and a control computer for controlling the operation of the solar concentrator and the solar irradiation device, Irradiate the outer surface of the heat transfer tube with sunlight while the soot on the heat transfer tube of the recovery device is relatively small.
The basic configuration of the invention is to heat and burn the adhered soot.

[0008]

[Operation] The sunlight focused by the Fresnel lens of the sunlight concentrator is sent through the optical fiber cable to the light output terminal section provided in the cylindrical body of the sunlight irradiation apparatus, and transmitted through the quartz lens of the light output terminal section. The outer surface of the heat tube is irradiated with sunlight. The tubular body of the solar irradiation device is arranged so that it can be inserted into and removed from the inside of an exhaust gas economizer and the like, and its operation is automatically controlled by a control computer. That is, by inserting and removing the tubular body, the position of the light output terminal portion fixedly mounted on the tip of the tubular body is sequentially moved along the heat transfer tube. When sunlight is radiated from the light emitting terminal to the outer surface of the heat transfer tube, the thin soot layer attached to the heat transfer tube is heated and burned by the irradiation heat of the sunlight. Further, the combustion residue is separated from the outer surface of the heat transfer tube by the wind pressure of the exhaust gas and carried away to the exhaust gas outlet side. Since the burning of the adhered soot is performed while the soot layer adhered to the heat transfer tube is thin, there is no risk of melting damage to the heat transfer tube due to so-called sootfire or the like.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a cleaning device for a calorific heat recovery device according to the present invention. In the figure, 1 is sunlight, 2 is a solar concentrator, 3 is an automatic solar tracking device, and 4 is an artificial assist. Light source device, 5 is an optical fiber cable, 6 is a sun position detecting optical sensor, 7 is an attitude control device, 8 is a solar irradiation device, 9 is a remote control cable, 10 is an exhaust gas economizer, 11 is an air supply pipe, and 12 is It is a control computer.

The solar light concentrating device 2 is mainly composed of a so-called condensing Fresnel lens, and its direction is automatically controlled by a solar light automatic tracking device 3 which is operated by a signal of a solar light position detecting optical sensor 6. Has been done. Further, the artificial auxiliary light source device 4 is used when there is no incidence of sunlight such as in rainy weather or at night, and a xenon lamp or the like having a wavelength spectrum close to that of sunlight is used. Furthermore,
The attitude control device 7 stabilizes the attitude of the solar light concentrating device 2 by a signal from the gyro when the ship is swaying. The posture of the device 2 is automatically controlled so that the light collection efficiency is the best.

The sunlight irradiating device 8 has a cylindrical main body which can be inserted into and removed from the main body of the exhaust gas economizer 10, a light emitting end portion made of a silica-based lens fixed to the front end portion of the main body, and a light emitting portion. The optical fiber connected to the end and a part of the air supplied to the gap between the cylindrical body and the optical fiber are jetted to clean the light emitting end, and the air is jetted to the sunlight irradiation part. It is composed of an air nozzle and a driving structure for inserting and removing the tubular main body at a predetermined speed. By inserting and removing the tubular main body, the light emitting end is sequentially moved along the heat transfer tube.

The control computer 12 controls the operation of the entire cleaning device, and the automatic sunlight tracking device 3, the attitude control device 7, the solar irradiation device 8 and the like are all instructed by the control computer 12. The signal controls its operation.

Next, the cleaning of the heat recovery device, for example, the exhaust gas economizer, by the cleaning device will be described. First, the solar light flux focused by the sunlight concentrator 2 is sent to the light exit end of the sunlight irradiation device 8 through the optical fiber cable 5. At this time, the solar light concentrating device 2 is automatically controlled by the solar light automatic tracking device 3 and the attitude control device 7 so that the attitude of the solar light concentrating device 2 is the direction in which the sunlight can be condensed most efficiently.

The solar irradiation device 8 is inserted into the exhaust gas economizer 10 (or pulled out from the exhaust gas economizer 10) at a constant speed in response to a signal from the control computer 12, whereby the solar irradiation device 8 is placed in a position facing the heat transfer tube. A certain light emitting end moves sequentially along the heat transfer tube. On the other hand, the sunlight transmitted through the optical fiber cable 5 is continuously radiated toward the outer surface of the heat transfer tube from the light emitting end provided at the tip of the tubular body of the solar irradiation device 8. As a result, the soot attached to the outer surface of the heat transfer tube is heated and burns. Further, the air supplied into the cylindrical main body is jetted from its tip to the heating section, whereby combustion of the soot is promoted. In the present invention, the soot adhering to the outer surface of the heat transfer tube burns the soot while it is in a relatively thin layer, so that a so-called soot burning state occurs. Therefore, the heat transfer tube is never melted.

The air supplied into the tubular body of the solar irradiation device 8 cools the optical fiber cable inside the tubular body, and most of it is used for promoting combustion of the soot, and a part thereof. Is used for cleaning the lens at the light exit end. Further, the artificial auxiliary light source device 4 is activated in rainy weather or at night, and the light from the artificial auxiliary light source device 4 is supplied to the sunlight irradiation device 8.

[0016]

According to the present invention, the sunlight focused by the sunlight concentrating device is guided to the sunlight irradiating device 8 through the optical fiber cable, and is arranged in the main body of the calorific heat recovery device so as to be freely inserted and removed. By irradiating the heat transfer tube with sunlight from the light emitting end fixed to the tip of the main body, the soot is heated and burned while the attached soot on the outer surface of the heat transfer tube is relatively small. As a result, the adhered soot is sequentially and continuously combusted in a so-called soot burning state in which the heat transfer tube is not melted and the combustion residue is completely separated from the outer surface of the heat transfer tube due to the exhaust gas flow or the like. Therefore, the outer surface of the heat transfer tube is almost completely cleaned. Further, according to the present invention, as a structure utilizing sunlight, energy saving can be achieved as compared with a cleaning device using steam or the like, and a great labor saving can be achieved by automation of cleaning. Further, in the present invention, the cooling air of the solar irradiation device is used to promote the combustion of soot and to clean the light emitting end portion, so that the adhered soot is not overheated, and it is smooth and reliable. It can be heated and burned, and there is no possibility that the heat transfer tube will be melted or damaged. In addition, in the present invention, since the sunlight irradiating device having the configuration in which the tubular main body having the fixed light emitting end portion is freely inserted into and removed from the main body of the calorie recovery device is used, the tubular main body is fixed. A predetermined amount of sunlight can be evenly and continuously radiated to the outer surface of the heat transfer tube by simply inserting and removing it at a speed, and the smooth burning of the adhered soot becomes possible.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a cleaning device of a calorific heat recovery device according to the present invention.

[Explanation of symbols]

1 is sunlight, 2 is a sunlight concentrating device, 3 is a sunlight automatic tracking device, 4 is an artificial auxiliary light source device, 5 is an optical fiber cable, 6 is an optical sensor for detecting the sun position, 7 is an attitude control device, and 8 is Sunlight irradiation device, 9 is a remote control cable, 1
0 is a heat recovery device, 11 is an air supply line, and 12 is a control computer.

Claims (5)

[Claims] 1. The sunlight concentrated by the sunlight concentrator is guided through an optical fiber cable to a sunlight irradiator that is freely inserted into and removed from the inferior heat recovery device, and while the heat transfer tube has relatively little soot attached. In addition to irradiating the outer surface of the heat transfer tube with sunlight from the light emitting end of the sunlight irradiator, the adsorbed soot is continuously heated and burned by sequentially moving the irradiation position. How to clean the device. 2. The incinerator according to claim 1, wherein the outer surface of the heat transfer tube is irradiated with sunlight and air is jetted to the outer surface of the heat transfer tube to promote combustion of the adhered soot by heating. Cleaning method of recovery device. 3. A sunlight concentrating device; a sunlight irradiating device having an output end portion of the sunlight, which is arranged so that it can be inserted into and removed from the incomplete gas recovery device, and the sunlight concentrating device and the sunlight. An optical fiber cable connecting the output end of the irradiation device;
It is composed of a control computer for controlling the operation of the solar light concentrating device and the solar light irradiation device, and irradiates sunlight to the outer surface of the heat transfer pipe while the soot adhered to the heat transfer pipe of the flue gas recovery device is relatively small. A cleaning device for a calorific heat recovery device, which heats and burns the adhered soot. 4. The eclampsia according to claim 3, wherein an automatic sunlight tracking device and an attitude control device are attached to the sunlight concentrating device, and an artificial auxiliary light source device is provided in parallel with the sunlight concentrating device. Cleaning device for recovery device. 5. A solar irradiation device is formed from a tubular body into which an optical fiber cable is inserted, and a light emitting end fixed to the tip of the tubular body, and supplied to the inside of the tubular body. The cleaning device for an adiabatic heat recovery device according to claim 3, wherein air is emitted from the tip of the device to the irradiation part of sunlight.