JP2548933B2 - Cleaning method of tube heat exchanger heat transfer tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention cleans dirt in heat transfer tubes of tubular heat exchangers such as refrigerators, air conditioners, chemical devices, and condensers that use cooling water. Method for cleaning a heat transfer tube of a tube heat exchanger for

[Conventional technology]

In Seki-type heat exchangers such as refrigerators, air conditioners, chemical devices, and condensers, tubular heat exchangers in which a large number of straight tubular heat exchangers are arranged are used, and heat exchange with high-temperature fluid is possible. Uses cooling water for this. Types of cooling water include fresh water and seawater.

When the cooling water is used for the heat exchanger, solids in the cooling water act to promote the dirt inside the heat transfer tube and the heat transfer rate of the heat exchanger according to the degree of dirt. As a result, the capacity of the refrigerator and the like is reduced, and the degree of vacuum is reduced and the head loss in the heat transfer tube is increased. For this reason, the inside of the heat transfer tube has been cleaned according to the degree of contamination in the heat transfer tube.

The conventional method for cleaning the heat exchanger tubes is to clean the inside of many heat exchanger tubes of the heat exchanger together with cooling water while the tube heat exchanger is in operation to clean the cross section of the heat exchanger tubes such as sponge rubber balls. A method is used in which the medium is circulated so as to pass through and the inside of the heat transfer tube is continuously cleaned.

In addition, a method has also been proposed in which the cleaning medium is also batchwise passed through the heat transfer tube to be cleaned, and the batchwise cleaning method improves the cleaning effect by improving the dispersion of the cleaning medium in each of the multiple heat transfer tubes. You can do it.

Further, in addition to the inlet cooling water pipeline and the outlet cooling water pipeline of the pipe heat exchanger, the diameter of the pipeline is different and the cleaning medium is introduced into the pipeline and circulated for separation and recovery from the pipeline. Is provided in the middle part of the pipeline, the cleaning medium is introduced from the circulation pipeline to the inlet cooling water pipeline, and is circulated from the outlet cooling water pipeline to the circulation pipeline. Separation and recovery are performed.

(For example, Douglas J. Smith, POWER ENGINEERING ", Jul
y, 1985, P42 and Japanese Patent Publication No. 39-594. ) [Problems to be Solved by the Invention] However, in the above-described conventional method for cleaning a tubular heat exchanger, when applied to a small-scale tubular heat exchanger with a relatively small amount of cooling water, an inlet cooling water pipe and As the diameter of the outlet cooling water pipeline becomes smaller, the diameter ratio between the diameter of the inlet cooling water pipeline and the diameter of the outlet cooling water pipeline and the cleaning medium is significantly reduced, and the inlet, the outlet cooling water pipeline, Since the smooth movement of the cleaning medium in the circulation pipe and the equipment is obstructed, the movement to the separator is not sufficiently performed, and the heat transfer pipe cannot be smoothly cleaned. In addition, the above problems have been extremely difficult as the size of the tubular heat exchanger is reduced.

Further, following the mixing of the cleaning medium with the inlet cooling water and the cleaning of the inside of the heat transfer tube, the separation and recovery of the cleaning medium from the outlet cooling water, such as the above-mentioned inlet, the outlet cooling water pipeline, the circulation pipeline and the cleaning medium in the equipment. It was proposed by the inventor to perform the movement under forced flow by a special pump for smooth movement, but the use of the pump complicates the operation including the congestion of the piping device,
There was also the problem of reducing economic efficiency.

The present invention is to solve such a conventional problem, can be applied to a small-scale tubular heat exchanger, the inlet by directly utilizing the water flow in the inlet cooling water pipeline and the outlet cooling water pipeline, The cleaning medium can be smoothly moved to the equipment such as the outlet cooling water pipeline, the separator, and the container, and the heat exchange capacity of the pipe heat exchanger can be improved, and special pipelines other than the above inlet and outlet cooling water pipelines. Another object of the present invention is to provide an excellent method for cleaning a heat transfer tube of a tubular heat exchanger that can omit the use of a pump.

[Means for solving problems]

In order to achieve the above object, the present invention provides a method for cleaning the inside of a heat transfer tube by passing a cleaning medium together with inlet cooling water pressurized in the heat transfer tube of the tube heat exchanger, and The connected separator has an intermediate separating material inside the separator, a first container through a first shutoff valve in the lower part of the separator, and a second container in the lower part of the first container. And a second container via a shutoff valve in series, and the cleaning medium together with the pressurized inlet cooling water passes through the inside of the heat transfer tube to clean the adhered dirt, and then from the heat transfer tube. The mixed flow of the pressurized outlet cooling water and the cleaning medium is guided to the separator, passes through the intermediate separation material and is separated into the outlet cooling water and the cleaning medium, and the outlet cooling water is discharged from the separator. The cleaning medium that is discharged and separated is generated by the alternating opening / closing operation of the first shutoff valve and the second shutoff valve. The inlet that is formed is moved under the condition of blocking the passage of the cooling water to the separator, and is sequentially received in the first container and the second container, and then is pressurized. Second cooling water is received by the cleaning member
The mixed flow of the inlet cooling water and the cleaning medium is introduced directly into the tubular heat exchanger.

[Action]

The present invention has the following effects due to the above-mentioned configuration.

That is, the cleaning medium passes through the inside of the heat transfer tube of the tubular heat exchanger under forced flow by directly using the pressurized inlet cooling water flow to be cleaned, and then passes through the inside of the heat transfer tube. The cleaning medium is directly guided to the separator by using the water flow of the outlet cooling water under forced flow to be separated into the outlet cooling water and the cleaning medium, and the outlet cooling water is discharged from the separator. The separated cleaning medium moves under the condition where the inlet cooling water formed by the alternating opening and closing operation of the first shutoff valve and the second shutoff valve is cut off to the separator, After being successively received in the first container and the second container, the pressurized inlet cooling water is mixed into the second container in which the cleaning member is received, and the inlet cooling water and the cleaning medium are received. The mixed flow of and is directly guided to the tube heat exchanger to clean the inside of the heat transfer tube.

As described above, even if the inlet cooling water pipeline and the outlet cooling water pipeline of the pipe heat exchanger have small diameters, the cleaning medium is forced to flow directly by using the pressurized inlet water flow. Since the cleaning medium is moved, the smooth movement can be achieved without causing retention in the inlet and outlet cooling water pipes, the separator, the container, etc. where the cleaning medium is mixed.

Then, in operations such as introduction of the cleaning medium into the pipe line, separation from the pipe line, recovery and reception in the container, special circulation other than the inlet and outlet cooling water pipe lines for moving the cleaning medium. The use of pipelines and pumps is omitted.

〔Example〕

FIG. 1 is a flow sheet showing an embodiment of the present invention. Reference numeral 10 denotes a tubular heat exchanger, in which a large number of straight tubular heat transfer tubes are arranged. Reference numeral 12 denotes an inlet cooling water pipeline, and 16 denotes an outlet cooling water pipeline. The inlet cooling water is supplied to the pipe heat exchanger 10, and heat is exchanged and then discharged. Reference numeral 13 denotes an inlet portion of the inlet cooling water pipe line 12, and 14 is a pump for pressurizing and flowing the inlet cooling water. As a cleaning medium for the heat transfer tube, a sponge rubber ball or the like is used, and if necessary, those having different properties such as hardness can be used.

The inlet cooling water flows under pressure from the inlet portion 13 to the required head using the pump 14, and the cleaning medium received in the second container 36 described later is directly mixed into the inlet cooling water pipe line 12. Then, the cleaning medium becomes a dispersed flow and is guided to the tube heat exchanger 10, and the cleaning medium passes through the cross section of the heat transfer tube along with the flow of the cooling water while rubbing against the inner surface and adheres to the inside of the heat transfer tube. Clean the dirt and use it as the outlet cooling water.
Emitted to 16. At this time, in the tube heat exchanger 10, the inside of the heat transfer tube is cleaned, and at the same time, the heat exchange action is continued and the operation thereof is not interrupted.

The outlet cooling water pipe 16 is provided with a branching device 18, and the outlet cooling water mixed with the cleaning medium passes through the branching device 18, and the main flow of the outlet cooling water mixed with the cleaning medium is the pipeline. 16
Flows downstream via valve 50.

The branching device 18 has a T shape and is provided with a separating member (not shown) inside thereof, and branches the outlet cooling water pipeline 16 into a pipeline 16a and a bypass pipeline 17 described later.

Reference numeral 20 denotes a separator provided at the end of the outlet cooling water pipe 16a, and reference numerals 22 and 28 denote an inlet and an outlet of the separator 20, respectively. An intermediate separator 24 is provided inside the separator 20, and 26 indicates an intermediate portion. Further, the separator 20 has a first container 32 via a first shutoff valve 30 at the lower part thereof and a second container 36 via a second shutoff valve 34 at the lower part of the first container 32. .. are sequentially connected in series to the separator 20 and are formed into a vertical cylindrical integral structure. Further, the first shutoff valve 30 and the second shutoff valve 34 are arranged so that they are alternately opened and closed.

The outlet cooling water having the required head is introduced into the separator 20 through the pipe 16a. In the separator 20, the intermediate portion 26 passes through the intermediate separating material 24 to separate the cleaning medium on the sieve from the outlet cooling water under the sieve, and from the outlet 28 through the pipe 16b to the valve 5
The water is discharged via 2 and the outlet cooling water is connected to a process outside the system via a pipe 16c.

The cleaning medium remaining in the intermediate portion 26 of the separator 20 is moved downwardly and received in the first container 32 by the alternating opening / closing operation of opening the first shutoff valve 30 and closing the second shutoff valve 34, Further, by switching the operation of the first shutoff valve 30 and the second shutoff valve 34, the cleaning medium is moved down and received from the first container 32 to the second container 36. At this time, the flow of the pressurized inlet cooling water in the inlet cooling water passage 12 using the pump 14 is changed to the first container.
Although it acts on 32 and the second container 36, respectively, it is possible to form a water cutoff state to the separator 20 by the alternate opening and closing action of the first shutoff valve 30 and the second shutoff valve 34. The cleaning medium is received in the first and second containers 32,36.

Reference numerals 40 and 38 respectively indicate an inlet and an outlet of the second container 36, and valves 42 and 43 are provided in the inlet cooling water line 12 for the second container 3 respectively.
6 are provided on the inlet 40 side and the outlet 38 side, respectively, and 15 indicates a bypass line of the inlet cooling water line 12, and a valve 46 is provided in the bypass line 15. Thus said valves 42,4
By the operation of 3 and 46, the inlet cooling water becomes the first and second
It is possible to bypass the vessels 32 and 36 of the above and lead them to the tube heat exchanger 10.

Further, as described above, 17 indicates the bypass pipe of the outlet cooling water pipe 16 via the branch device 18, and the bypass pipe 17 is provided with the valve 57. Due to the closing of the valve 50 and the opening of the valve 57, the outlet cooling water containing no cleaning medium flows through the separator 20 and the first and second containers 32, 36 in the bypass line 17 due to the separating material of the branching device 18. It is bypassed, merged with the side of the conduit 16c, and connected to a process outside the system.

In this way, operations such as mixing the cleaning medium with the inlet cooling water, cleaning the inside of the heat transfer tube, separating the cleaning medium from the outlet cooling water, collecting, and receiving the descending medium into the container are repeated. Thus, there is no separate pipeline other than the inlet cooling water pipeline and the outlet cooling water pipeline of the tubular heat exchanger, and even if the pipeline mouth has a small diameter, the cleaning medium can flow the pressurized inlet cooling water flow. Since it is directly used and moved under forced flow, the above-mentioned inlet and outlet cooling water pipes, separators, which are mixing the cleaning medium,
The movement can be facilitated without causing retention or blockage in the container or the like. Further, since the cleaning member is sequentially received and moved downward in the integrated structure of the separator 20, the first and second containers 32, 36, etc., it is possible to smoothly move the cleaning member in the same manner as the above-mentioned movement. You can Therefore, the inside of the heat transfer tube of the tube heat exchanger can be reliably cleaned, and the heat exchange capacity and the capacity of the refrigerator and the like can be significantly improved.

Further, in the operations such as introduction of the cleaning medium into the inlet cooling water pipeline, separation from the outlet cooling water pipeline, collection, and reception in the container, the inlet cooling water and the outlet cooling water for moving the cleaning medium are used. Since it is possible to omit the use of special pipes or pumps other than the water pipe, it is possible to avoid complicated operation such as crowding of piping devices, and it is possible to bring about an economical effect.

In particular, in the case where a small number of pipe-type heat exchangers are installed in a plurality of units, it is possible to remarkably simplify the facilities by omitting the use of the above pipes and pumps, and to further improve the economic effect. .

Needless to say, the embodiment of the present invention is not limited to the above-mentioned embodiment, and many embodiments can be adopted.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As is apparent from the above-described embodiment, the present invention is applied to a small-sized tubular heat exchanger in cleaning the inside of the tubular heat exchanger by passing the cleaning medium together with the cooling water into the tubular heat exchanger. Therefore, it is possible to smoothly move the cleaning medium to the equipment such as the inlet cooling water, the outlet cooling water pipeline and the separator, the container, etc., and the inside of the heat transfer tube is not reliably cleaned. The capacity, the capacity of the refrigerator, etc. can be improved, and the use of a special circulation conduit or pump other than the inlet cooling water conduit and the outlet cooling water conduit can be omitted, so that an economic effect can be brought about.

Especially for equipment with multiple small-scale tubular heat exchangers installed, it is possible to significantly simplify the equipment by omitting the use of the above circulation pipelines and pumps, and to further improve the economic effect. Can be made.

[Brief description of drawings]

FIG. 1 is a flow sheet of a method for cleaning a heat transfer tube of a tubular heat exchanger according to an embodiment of the present invention. 10 …… Tube heat exchanger, 12 …… Inlet cooling water pipe, 16 …… Outlet cooling water pipe, 18 …… Brancher, 20 …… Separator, 30,34…
... First and second shutoff valves, 32,36 ... First and second
Container of

Claims (1)

(57) [Claims] 1. A method for cleaning the inside of a heat transfer tube by passing a cleaning medium together with pressurized inlet cooling water into the heat transfer tube of the tube heat exchanger, wherein a separator connected to the tube heat exchanger is ,
The separator has an intermediate separating material, a lower part of the separator has a first container via a first shutoff valve, and a lower part of the first container has a second shutoff valve via a first shutoff valve. 2 container in series, and the cleaning medium together with the pressurized inlet cooling water passes through the heat transfer tube to clean the adhered dirt, and then the pressurized outlet cooling water from the heat transfer tube. And the mixed flow with the cleaning medium is guided to the separator, passes through the intermediate separating material and is separated into the outlet cooling water and the cleaning medium, and the outlet cooling water is discharged from the separator and separated. The cleaning medium moves under the condition where the inlet cooling water is formed by the alternating opening / closing operation of the first shutoff valve and the second shutoff valve to shut off the passage of water to the separator, and the first container And sequentially received in the second container and then the pressurized inlet cooling water is received in the cleaning member. The second is mixed in the vessel, the inlet cooling water and cleaning medium and cleaning method of tube heat exchanger heat transfer tube mixed flow, characterized in that the guided directly to the tube heat exchanger that.