JP2844512B2 - Heat exchanger cleaning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger cleaning apparatus.

[0002]

2. Description of the Related Art FIG. 3 shows an example of the use of this type of heat exchanger. That is, the vertical pump 3 is rotatably driven by the diesel engine 1 via the clutch 1A and the speed reducer 2, and the vertical pump 3 drains water containing sludge and the like in the water absorption tank 4 through the discharge pipe 5. A heat transfer pipe unit 6 is disposed at a predetermined position in the discharge pipe 5, a cooling water circulation pipe 7 of the diesel engine 1 is connected to an inlet and an outlet of the heat transfer pipe unit 6, and a circulation pump is interposed in the cooling water circulation pipe 7. The cooling water is circulated by the heat transfer tube unit 6.
The indirect heat exchange between the heated cooling water of the diesel engine 1 passing through the pump and the pumped water passing through the discharge pipe 5 cools the heated cooling water of the diesel engine 1.

However, if foreign matter, which is contained in a large amount in the pumping water passing through the discharge pipe 5, adheres to the surface of a large number of heat transfer pipe groups 6A constituting the heat transfer pipe unit 6, the heat transfer of the heat transfer pipes is alienated. This is a factor that significantly reduces the heat exchange efficiency.
Therefore, a cleaning operation is required to periodically or as necessary remove foreign substances attached to the surface of the heat transfer tube group 6A and the like. However, the conventional cleaning method has a disadvantage that the heat exchanger has to be disassembled, that is, the heat transfer tube unit 6 has to be disassembled, so that the cleaning operation is troublesome. Therefore, the present applicant has provided a cleaning method capable of performing cleaning without disassembling the heat exchanger (heat transfer tube unit 6) (Japanese Patent Publication No. Hei 2-44000).

According to this cleaning method, cleaning can be performed without disassembling the heat exchanger, so that cleaning workability can be greatly improved. However, since a large number of heat transfer tube groups 6A are heated by the heated cooling water of the diesel engine 1, foreign matter adhering to the surface of the heat transfer tube group 6A is dried, and the heat transfer tube group 6A is heated. The diesel engine 1 which consumes a large amount of energy must be kept running at a specified speed until it is spontaneously separated due to the thermal expansion difference.
Therefore, there is a problem that the cost required for cleaning is high.

[0005]

A problem to be solved is that a diesel engine consuming a large amount of energy continues to operate at a specified speed and the heated cooling water (first fluid) is passed through a heat transfer tube unit. Cleaning costs are high.

[0006]

According to the present invention, a heat transfer tube unit through which a first fluid passes is disposed in a second fluid passage through which a second fluid passes, and the first fluid and the first fluid pass through the heat transfer tube unit. In a heat exchanger cleaning device in which the second fluid exchanges heat, a communication pipe is provided for communicating one upstream position of the inlet and one downstream position of the outlet of the heat transfer tube unit, and a bypass valve is provided in the communication tube. An exhaust gas introduction pipe of the engine is connected to the other inlet of the heat transfer tube unit, and an exhaust gas discharge pipe of the engine is connected to the other outlet of the heat transfer tube unit. The cooling water cutoff valve is interposed on the upstream side of the outlet downstream position of the exhaust gas and on each of the exhaust gas introduction pipe and the exhaust gas discharge pipe. To achieve the objective to reduce the door.

[0007]

According to the present invention, the engine is operated at a low speed before the operation of the pump, the flow of the second fluid in the second fluid passage is cut off by turning off the clutch, and one inlet upstream of the heat transfer tube unit is operated. Close the cooling water cutoff valve provided on the downstream side of the position and on the upstream side of the one outlet downstream position, and set the exhaust gas flow path forming valve provided on the exhaust gas introduction pipe and the exhaust gas flow forming valve provided on the exhaust gas outlet pipe. Open each, introduce the exhaust gas from the engine into the heat transfer tube unit, heat it while passing it through the heat transfer tube unit, draw it out, and dry the foreign matter adhering to the surface of the heat transfer tube unit. The foreign matter can be spontaneously peeled off due to the difference in thermal expansion between it and the foreign matter. Further, the peeled foreign matter can be carried out by the second fluid.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram showing one embodiment of the present invention.
Note that the same or corresponding portions as those in the conventional example of FIG. 3 are denoted by the same reference numerals, and detailed description is omitted. In FIG. 1, a heat transfer tube unit 6 for passing heated cooling water W1 of a diesel engine 1 is arranged at a predetermined position in a discharge pipe 5 for passing pumped water W2 drawn from a water absorption tank 4 by a vertical shaft pump 3. . The heat transfer tube unit 6, as shown in FIG.
A large number of heat transfer tube groups 6A and a pair of left and right headers 6B1 and 6B2 bridging the heat transfer tube groups 6A are provided. One inlet of the upstream header 6B1 and the downstream header -6B are provided.
The cooling water circulation pipe 7 is connected to one outlet of the cooling water circulation pipe 2.

On the other hand, the vicinity of one inlet of the upstream header-6B1 in the cooling water circulation pipe 7, ie, the upstream position P1 of the upstream header-6B1, and the vicinity of one outlet of the downstream header-6B2 in the cooling water circulation pipe 7, ie, A communication pipe 9 for communicating the downstream position P2 of the downstream header-6B2.
The communication pipe 9 is provided with a bypass valve 9A. In addition, the upstream position P in the cooling water circulation pipe 7
Cooling water shut-off valves 10 and 11 are provided on the downstream side of the cooling water shutoff valve 1 and on the upstream side of the downstream position P2, respectively.

On the other hand, an exhaust gas introduction pipe 12 of the engine 1 is connected to the other inlet of the upstream header 6B1 in the heat transfer tube unit 6, and an exhaust gas discharge pipe 13 of the engine is connected to the other outlet of the downstream header 6B2. At the same time, an exhaust gas flow forming valve 14 is provided in the exhaust gas introducing pipe 12, and an exhaust gas flow forming valve 15 is provided in the exhaust gas outlet pipe 13.

With such a configuration, the clutch 1A is turned off before the vertical shaft pump 3 is operated, the engine 1 is operated at a low speed, and the cooling water cutoff valves 10 and 11 are closed. Exhaust gas flow path forming valve 14
And exhaust gas flow forming valve 1 provided in exhaust gas outlet pipe 13
5 is opened to form an exhaust gas flow path, and a part of the exhaust gas of the diesel engine 1 operating at a low speed is transferred to the heat transfer tube unit 6.
To the outside through the exhaust gas outlet pipe 13 to be heated while passing through the inside, and to remove foreign substances adhering to the surface of the large number of heat transfer pipe groups 6A and the like by the previous drainage operation performed by the vertical pump 3. After drying, the foreign matter is spontaneously peeled off by the thermal expansion difference between the heat transfer tube group 6A and the foreign matter, and is removed from the surface of the large number of heat transfer tube groups 6A and the like. During this time, if the bypass valve 9A provided in the cooling water circulation pipe 7 is opened,
The cooling water W1 of the diesel engine 1 is supplied to the heat transfer tube unit 6
Can be circulated outside the

On the other hand, after a lapse of a predetermined time, the cooling water cutoff valve 1
After opening 0, 11 and closing the exhaust gas flow path forming valves 14, 15 and the bypass valve 9A, the diesel engine 1 is operated at a specified speed and the clutch 1A is turned on to operate.
When the vertical shaft pump 3 is driven to rotate via the speed reducer 2, water containing sludge and the like in the water absorption tank 4 is discharged as pumping water W2 into the discharge pipe 5.
Through the heat transfer pipe unit 6 and indirect heat exchange between the cooling water W1 of the diesel engine 1 passing through the heat transfer tube unit 6 and the pumping water W2 passing through the discharge pipe 5. The heated cooling water is cooled.

As described above, since the cleaning can be performed while the diesel engine 1 consuming a large amount of energy is operated at a low speed, the cleaning is performed in comparison with the conventional cleaning method in which the diesel engine 1 is cleaned at a specified speed. hand,
Cost can be reduced.

[0014]

As described above, according to the present invention, the engine is operated at a low speed before the operation of the pump, the flow of the second fluid in the second fluid passage is cut off, and one of the inlets of the heat transfer tube unit is provided. The cooling water cutoff valve provided on the downstream side of the upstream position and the upstream side of the one outlet downstream position is closed, and the exhaust gas passage forming valve provided on the exhaust gas introduction pipe and the exhaust gas passage forming valve provided on the exhaust gas outlet pipe are closed. , The engine exhaust gas is introduced into the heat transfer tube unit, heated while passing through the heat transfer tube unit, led out to the outside, and the foreign matter adhering to the surface of the heat transfer tube unit is dried. The conventional cleaning, in which the engine is operated at a specified speed while the engine is running at a specified speed, since the foreign matter is spontaneously peeled off due to a difference in thermal expansion between the unit and the foreign matter, and the peeled-off foreign matter is carried outside by the second fluid. Compared modulo, it is possible to reduce the cost.

[Brief description of the drawings]

FIG. 1 is a system diagram showing one embodiment of the present invention.

FIG. 2 is an enlarged view of a main part.

FIG. 3 is a system diagram of a conventional example.

[Explanation of symbols]

 Reference Signs List 5 discharge pipe (second fluid passage) 6 heat transfer pipe unit 9 communication pipe 9A bypass valve 10 cooling water cutoff valve 11 cooling water cutoff valve 12 exhaust gas introduction pipe 13 exhaust gas discharge pipe 14 exhaust gas flow path forming valve 15 exhaust gas flow path forming valve P1 One inlet upstream position of the heat transfer tube unit P2 One outlet downstream position of the heat transfer tube unit W1 Cooling water (first fluid) W2 Pumping (second fluid)

Claims (1)

(57) [Claims] 1. A heat transfer tube unit through which a first fluid passes is a second heat transfer tube unit.
A heat exchanger, wherein the first fluid and the second fluid are heat-exchanged through the heat transfer tube unit, and the heat transfer tube unit is provided with one inlet of the heat transfer tube unit A communication pipe is provided for communicating the upstream position with the one downstream position of the outlet, a bypass valve is interposed in the communication pipe, an exhaust gas introduction pipe of the engine is connected to the other inlet of the heat transfer pipe unit, and the other end of the heat transfer pipe unit An exhaust gas outlet pipe of the engine is connected to the outlet of the engine, and a cooling water shutoff valve is connected to each of the exhaust gas inlet pipe and the exhaust gas outlet pipe on the downstream side of the one inlet upstream position and the upstream side of the one outlet downstream position. A cleaning device for a heat exchanger, which is provided.