JP5042983B2 - Heat transfer tube cleaning tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat transfer tube cleaning tool capable of surely removing foreign matters attached to an outer surface of a heat transfer tube without increasing work burden. <P>SOLUTION: A foreign matter removing section 10a is formed by slidably inserting a wire 2 such as a piano wire into a plurality of wire supporting sections 1a pierced and formed in the longitudinal direction of a vertically-long member 1, projecting the wire 2 from the longitudinally-long member 1 in the shape of loops, and fixing both ends of the wire 2 to the vertically-long member 1. When the heat transfer tube cleaning tool 10 is inserted between the heat transfer tubes 51 and reciprocated, the wire 2 is pressed and contracted by the opposed heat transfer tube 51, the wire 2 excluding a part pressed and contracted by the heat transfer tube is expanded outward, and the wire 2 reaches an opposed face 51b of the heat transfer tube 51 opposed in the inserting direction, thus the foreign matters attached to the opposed face 51b can be removed. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a heat transfer tube cleaning tool for removing foreign matter adhering to the outer periphery of a heat transfer tube.

  A heating furnace used for a continuous annealing furnace, a heat treatment furnace, and the like heats an object to be heated with heat generated when fossil fuel such as coal, heavy oil, natural gas, or the like is burned. In such a heating furnace, in response to a demand for energy saving, heat is recovered from the exhaust gas generated after the combustion of fossil fuel, the combustion air is preheated with the recovered heat, and the amount of heat discarded is reduced. In general, a recuperator that increases thermal efficiency is also provided (shown in Patent Document 1).

  As shown in FIG. 7, such a recuperator 50 is provided with a plurality of heat transfer tubes 51 spaced apart in parallel, and exhaust gas flows outside the heat transfer tubes 51, that is, between adjacent heat transfer tubes 51. In addition, the combustion air is circulated inside the heat transfer tube 51. Combustion air that circulates inside the heat transfer tube 51 is preheated by heat exchange with exhaust heat of the exhaust gas in the heat transfer tube 51.

  On the other hand, if foreign matter such as fossil fuel-derived ash contained in the exhaust gas adheres to the outer surface of the heat transfer tube 51, exhaust heat of the exhaust gas is difficult to transfer to the heat transfer tube 51. The combustion air that circulates inside becomes difficult to be preheated, and as shown in FIG. 8, the temperature efficiency of the recuperator 50 is reduced compared to the design value.

Then, the operator removed the foreign material adhering to the outer peripheral surface of the heat exchanger tube 51 using the wire brushes 61 and 62 as shown in FIG. The wire brush 61 has a structure in which a large number of wires 61b are implanted on one side of the tip of the rod-shaped member 61a. The wire brush 62 has a large number of wires 62b on the entire circumference of the tip of the rod-shaped member 62. It has a structure planted radially. Such wire brushes 61 and 62 are inserted between the adjacent heat transfer tubes 51 by an operator and reciprocated in the insertion direction, thereby scraping off and removing foreign substances adhering to the outer peripheral surface of the heat transfer tubes 51.
JP 2003-21471 A

  However, when the lengths of the wires 61b and 62b are short, the wires 61b and 62b do not reach the portion where the heat transfer tubes 51 adjacent to each other in the insertion direction face each other (the non-removable range shown in FIG. 7). The adhered foreign matter could not be removed. On the other hand, when the lengths of the wires 61b and 62b are increased, a large force is required for the operator to reciprocate the wire brushes 61 and 62, and the work load on the operator is increased.

  Further, in the wire brushes 61 and 62 as shown in FIG. 7, the wires 61 b and 62 b are in point contact with the heat transfer tube 51, so that the wire brush 61 can be used to remove foreign matters attached to the outer surface of the heat transfer tube 51. , 62 need to be reciprocated many times. On the other hand, if the density of the wires 61b and 62b is increased, the number of times of reciprocating the wire brushes 61 and 62 can be reduced, but a large force is required to reciprocate the wire brushes 61 and 62, and the operator's work The burden will increase.

  The objective of this invention is providing the heat exchanger tube cleaning tool which can remove the foreign material adhering to the outer surface of a heat exchanger tube reliably, without solving the said problem and increasing work burden.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a wire is sequentially slidably inserted into a plurality of wire support portions formed in the longitudinal direction of the vertically long member, and the wire is drawn from the vertically long member. A foreign matter removing portion is formed by protruding in a loop shape and fixing both ends of the wire to the vertically long member.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, a hole supporting member is formed by penetrating a hole having an inner diameter larger than the outer diameter of the wire in the vertically long member.

A third aspect of the present invention is characterized in that, in the first or second aspect of the present invention, the wire is made of a wire having a longitudinal elastic modulus of 35000 N / mm ² or more.

According to the first aspect of the present invention, a plurality of wire support portions formed in the longitudinal direction of the vertically long member are sequentially inserted so that the wires are slidable, and the wire is protruded from the vertically long member in a loop shape. Both ends are fixed to the vertically long member to form a foreign substance removing portion.
For this reason, when the operator inserts the heat transfer tube cleaning tool between the heat transfer tubes and reciprocates, the wires are compressed by the opposite heat transfer tubes and the portions other than the portions compressed by the heat transfer tubes are compressed. The wire spreads outward and reaches the opposing surface of the heat transfer tube facing in the insertion direction, so that it is possible to remove foreign matter adhering to the opposing surface.
Moreover, since the wire protrudes from the vertically long member in a loop shape, the wire comes into line contact with the outer peripheral surface of the heat transfer tube, so that it is possible to efficiently scrape off the foreign matter adhering to the outer surface of the heat transfer tube.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, a hole supporting member is formed by penetrating a hole having an inner diameter larger than the outer diameter of the wire in the vertically long member.
For this reason, it becomes possible to form a wire support part with a structure with easy manufacture.

A third aspect of the present invention is characterized in that, in the first or second aspect of the present invention, the wire is made of a wire having a longitudinal elastic modulus of 35000 N / mm ² or more.
For this reason, it becomes possible to make a wire reach the opposing surface of the heat exchanger tube which opposes an insertion direction, without plastic deformation, and it becomes possible to use repeatedly.

(Description of the structure of the heat transfer tube cleaning tool of the present invention)
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall view of a heat transfer tube cleaning tool 10 showing an embodiment of the present invention, FIG. 2 is a detailed view of a main part of FIG. 1, and FIG. 3 is a view taken in the direction of arrow A in FIG. The heat transfer tube cleaning tool 10 of the present invention includes a vertically long member 1 and a metal wire 2. In the embodiment shown in FIG. 1, the vertically long member 1 is a vertically long metal plate material. A plurality of wire support portions 1a are formed at predetermined intervals in the longitudinal direction of the vertically long member 1. In the embodiment shown in FIG. 1, the wire support portion 1 a is formed by penetrating a hole communicating the front and back of the vertically long member 1. In the embodiment shown in FIG. 1, a plurality of wire support portions 1 a are formed from the tip of the vertically long member 1 to the middle portion.

  The wire 2 is sequentially inserted into the wire support portion 1a of the vertically long member 1 from the front end side of the vertically long member 1 to the middle portion, and the wire 2 is projected in a loop shape in a direction substantially orthogonal to the longitudinal direction of the vertically long member 1. Thus, the foreign matter forming portion 10a is formed. As shown in FIG. 3, the wire 2 has a spiral shape, and one end of the spiral is supported by the wire support portion 1 a of the longitudinal member 1. The inner diameter of the wire support portion 1 a is larger than the outer diameter of the wire 2. For this reason, the wire 2 is slidably supported by the wire support portion 1a. Both ends of the wire 2 are fixed to the fixing portion 1 b of the longitudinal member 1.

(Description of heat transfer tube cleaning tool usage)
The schematic diagram of the use condition of the heat exchanger tube cleaning tool 10 is shown in FIG. When cleaning the heat transfer tube 51, the operator inserts the foreign matter removing portion 10 a of the heat transfer tube cleaning tool 10 between the adjacent heat transfer tubes 51. Then, as shown in FIG. 4, the spiral wire 2 is pressed and compressed by the facing surface 51 a of the heat transfer tube 51 facing in the lateral direction (direction orthogonal to the insertion direction). Since the wire 2 is slidable by the wire support portion 1a, and both ends of the wire 2 are fixed by the fixing portion 1b, the partial wires 2 other than being compressed by the facing surface 51a are Spread outward. For this reason, the wire 2 reaches the facing surface 51b of the heat transfer tube 51 facing the insertion direction.

  When an operator reciprocates the heat transfer tube cleaning tool 10 in the insertion direction, the spiral wire 2 is sequentially compressed by the opposed surface 51a, and the wire other than the portion compressed by the opposed surface 51a. 2 spreads to the outside sequentially, and the wire 2 sequentially contacts the opposing surface 51a and the opposing surface 51b of the heat transfer tube 51, so that foreign matters are scraped off. In the heat transfer tube cleaning tool 10 of the present invention, the wire 2 protrudes from the vertically long member 1 in a loop shape, so that the wire 2 is in line contact with the outer peripheral surface of the heat transfer tube 51 and efficiently adheres to the outer surface of the heat transfer tube 51. Scraped off foreign matter.

  Since the spiral wire 2 needs to be pressed and compressed by the facing surface 51a, in the present invention, the loop diameter d (shown in FIG. 3) of the wire 2 is set to the heat transfer tube 51 facing in the lateral direction. Is set to be equal to or larger than the separation dimension L (shown in FIG. 4). On the other hand, if the loop diameter d of the wire 2 is set to be large, the insertion resistance when inserting the foreign matter removing portion 10a between the adjacent heat transfer tubes 51 becomes large, and the work burden on the operator becomes large. For this reason, it is preferable to set the loop diameter d of the wire 2 to be equal to or smaller than the dimension (L + D) obtained by adding the diameter D of the heat transfer tube 51 to the spacing dimension L.

  When the pitch p (shown in FIG. 4) of the adjacent wire support portions 1a is reduced, the number of times of contact of the wire 2 with the heat transfer tube 51 is increased by one reciprocating operation of the heat transfer tube cleaning tool 10, thereby improving work efficiency. To do. On the other hand, if the pitch p of the adjacent wire support portions 1a is too small, the contact resistance increases and the work load increases. For this reason, the work efficiency and work load are compared and considered, and the pitch p of the adjacent wire support portions 1a is set to an appropriate dimension.

  In the present invention, when the wire 2 is pressed against the facing surface 51a, it is necessary to deform so that a portion other than the facing surface 51a expands outward. Therefore, the wire 2 has a high longitudinal elastic modulus and is difficult to be plastically deformed. It consists of. In other words, the wire 2 used for this invention is comprised with the wire which can be used in an elastic deformation area | region. In this embodiment, the wire 2 is composed of the wire materials shown in Table 1 below.

縦弾性係数が３５０００（Ｎ／ｍｍ^２）より小さい線材でワイヤー２を構成すると、ワイヤー２が塑性変形し、対向面５１ａで押縮されている以外の部分のワイヤー２が、外側に拡がらなくなってしまう。実用的には黄銅線（３９０００Ｎ／ｍｍ^２）以上の縦弾性係数があるとより好ましい。一方で、縦弾性係数が８００００（Ｎ／ｍｍ^２）より大きい線材、例えばピアノ線（７８０００Ｎ／ｍｍ^２）より縦弾性係数が大きいでワイヤー２を構成すると、ワイヤー２が変形し難くなり、作業者の作業負担が増大してしまう。以上から、ワイヤー２を、縦弾性係数が３９０００〜７８０００（Ｎ／ｍｍ^２）の線材で構成することがより好ましい。

When the wire 2 is made of a wire having a longitudinal elastic modulus smaller than 35000 (N / mm ² ), the wire 2 is plastically deformed, and the portion of the wire 2 other than being compressed by the facing surface 51a does not spread outward. End up. Practically, it is more preferable to have a longitudinal elastic modulus of brass wire (39000 N / mm ² ) or more. On the other hand, the modulus of longitudinal elasticity is 80000 (N / mm ²⁾ greater than wire, for example, constitute a piano wire (78000N / mm ²⁾ wire 2 in a longitudinal elastic coefficient is larger than, be wire 2 is difficult to deform, worker Will increase the work load. From the above, it is more preferable that the wire 2 is made of a wire having a longitudinal elastic modulus of 39000 to 78000 (N / mm ² ).

  If the wire 2 is composed of a wire having a large longitudinal elastic modulus, the deformation amount (d / L) of the wire 2 can be set large, and the wire 2 can easily reach the facing surface 51b. Therefore, it is preferable that the wire 2 is composed of a piano wire or the like having a large longitudinal elastic modulus. On the other hand, when the heat transfer tube 51 is made of a material such as a copper tube that has low hardness and is easily damaged, the wire 2 is preferably made of a brass wire, beryllium copper wire, or the like having a slightly low longitudinal elastic modulus. In this case, the deformation amount (d / L) of the wire 2 is set small.

  If the wire diameter of the wire 2 is made thinner than 0.1 mm, the wire strain becomes weak (spring constant becomes small), and the foreign substance removal performance is remarkably deteriorated, and breakage occurs due to wear caused by the heat transfer tube and attached foreign substances. On the other hand, when the wire diameter of the wire 2 is thicker than 1.5 mm, the wire 2 is difficult to be deformed, it becomes difficult for the operator to reciprocate the heat transfer tube cleaning tool 10, and the work load on the operator is increased. For this reason, in this invention, the wire diameter of the wire 2 is set to 0.1 mm-1.5 mm. In consideration of durability and workability, the wire diameter of the wire 2 is preferably set to 0.3 mm to 0.7 mm.

(Effect when cleaning the heat transfer tube)
FIG. 5 shows a graph of the effect of improving the thermal efficiency of the recuperator. As shown in FIG. 5, when the heat transfer tube 51 of the recuperator is cleaned with the heat transfer tube cleaning tool 10 of the present invention, the heat efficiency is naturally improved as compared to before the heat transfer tube 51 is cleaned. Even if it compares with the case where the heat exchanger tube 51 is cleaned by 61 and 62, the thermal efficiency of a recuperator will be improved. This is because the foreign matters adhering to the heat transfer tube 51 that could not be removed by the conventional wire brushes 61 and 62 can be removed.

  FIG. 6 is a graph showing the effect of the recuperator on preventing the flue blockage. As shown in FIG. 6, when the heat transfer tube 51 of the recuperator is cleaned with the heat transfer tube cleaning tool 10 of the present invention, the flow rate of the exhaust gas naturally increases as compared to before the heat transfer tube 51 is cleaned. Compared to the case where the heat transfer tubes 51 are cleaned with the conventional wire brushes 61 and 62, the flow rate of the exhaust gas increases. This is also because foreign substances adhering to the heat transfer tube 51 that could not be removed by the conventional wire brushes 61 and 62 can be removed.

  In the embodiment described above, the vertically long member 1 is made of a vertically long metal plate, but the vertically long member 1 may be made of a square tube, a circular tube, or a bar. Further, a plurality of foreign matter removing portions 10a may be formed on the heat transfer tube cleaning tool 10 in series or in parallel.

  Moreover, in embodiment described above, although the hole of the internal diameter larger than the outer diameter of the wire 2 is penetrated in the vertically long member 1, and the wire support part 1a is formed, the wire support part 1a is limited to this structure. For example, the wire support portion 1a may be configured by a metal fitting that supports the wire 2 slidably, and the wire support portion 1a includes any wire support portion having a structure that supports the wire 2 slidably. It is.

  The heat transfer tube 51 cleaned with the heat transfer tube cleaning tool 10 of the present invention is not limited to the heat transfer tube 51 used in the recuperator, and includes any heat transfer tube 51 that exchanges heat inside and outside the tube, for example, the heat transfer tube 51. It goes without saying that the heat transfer tube cleaning tool 10 of the present invention can also be used for cleaning the heat transfer tube 51 used in a boiler in which water or water vapor circulates inside and generates heated steam.

  Although the present invention has been described above in connection with the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. However, the present invention can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and it is understood that the heat transfer tube cleaning tool with such a change is also included in the technical scope. There must be.

It is a general view of the heat exchanger tube cleaning tool which shows embodiment of this invention. It is a principal part detail drawing of FIG. FIG. 3 is a view as seen from an arrow A in FIG. 2. It is a schematic diagram which shows the use condition of a heat exchanger tube cleaning tool. It is a graph which shows the thermal efficiency improvement effect. It is a graph which shows a flue blockage prevention effect. It is explanatory drawing of a recuperator and a cleaning tool. It is a graph showing the temperature efficiency of a recuperator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vertical member 1a Wire support part 1b Adhering part 2 Wire 10 Heat transfer tube cleaning tool 10a Foreign material removal part 50 Recuperator 51 Heat transfer pipe 51a Opposing surface 51b Opposing surface 61 Wire brush 61a Rod-shaped member 61b Wire 62 Wire brush 62a Rod-shaped member 62b Wire-shaped member 62b Loop diameter L Heat transfer tube spacing p Pitch between adjacent wire supports

Claims (3)

  A plurality of wire support portions formed in the longitudinal direction of the vertically long member are sequentially inserted so that the wires are slidable, the wire is protruded from the vertically long member in a loop shape, and both ends of the wire are fixed to the vertically long member. A heat transfer tube cleaning tool in which a foreign matter removing portion is formed.   The heat transfer tube cleaning tool according to claim 1, wherein a hole supporting member is formed by penetrating a hole having an inner diameter larger than the outer diameter of the wire in the longitudinal member. The heat transfer tube cleaning tool according to claim 1 or 2, wherein the wire is made of a wire having a longitudinal elastic modulus of 35000 N / mm ² or more.

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