JP6939265B2 - Heat recovery device - Google Patents

Description

The present invention relates to a device installed in a flow path of a gas having heat, such as combustion exhaust gas of fossil fuel, to recover heat.

In equipment that burns various types of fuel, a heat recovery device called a gas gas heater or the like may be installed on the flow path of the exhaust gas to recover heat from the exhaust gas.

For example, when burning fossil fuels such as coal, a desulfurization device is provided on the flow path in order to remove sulfur and the like contained in the exhaust gas. The desulfurization apparatus is a mechanism that dissipates an absorption liquid such as water to exhaust gas and dissolves sulfur in the absorption liquid, for example. When it passes through the desulfurization device, the temperature of the exhaust gas drops, so that the moisture in the exhaust gas may aggregate to form white smoke. Therefore, a heat recovery device is provided in the flow path of the exhaust gas on the upstream side of the desulfurization device to recover heat from the high-temperature exhaust gas, and the recovered heat is used to control the temperature of the exhaust gas on the downstream side of the desulfurization device. It is raised and the water in the exhaust gas is discharged in the state of water vapor. By doing so, it is possible to prevent the exhaust gas from being released into the atmosphere in a state where it can be visually recognized as white smoke. Prior art documents related to this type of heat recovery device include, for example, the following Patent Document 1.

In such a heat recovery device, for example, a large number of heat transfer tubes are arranged as heat transfer materials in the flow path of the exhaust gas, and the heat in the exhaust gas is received by the heat transfer tubes. The heat transfer tube is made of a material having high thermal conductivity such as metal, and fins are formed on the surface to secure a heat exchange area with exhaust gas. In addition, a heat medium circulates inside the heat transfer tube to carry the heat received by the heat transfer tube.

Japanese Unexamined Patent Publication No. 2000-304237

By the way, when the heat recovery device as described above is installed in the equipment for burning coal or the like, there is a problem that the heat transfer tube constituting the heat recovery device is worn by the solid particles because the combustion exhaust gas contains solid particles. .. If the amount of wear becomes large, there is a risk that the heat medium may flow out from the heat transfer tube. Therefore, the heat transfer tube needs to be replaced regularly, and the replacement requires considerable labor and cost. In addition, if the heat medium flows out from the heat transfer tube, it is necessary to stop the operation of the heat recovery device, identify the outflow location, and take measures such as plugging the heat recovery tube. Will occur.

In view of such circumstances, the present invention aims to provide a heat recovery device capable of effectively suppressing wear of a heat transfer material.

The present invention constitutes a flow path through which a gas containing solid particles flows, a heat transfer device installed in the flow path, and a part of the heat transfer device, and the gas and heat passing through the heat transfer device. A heat transfer material to be replaced and a dummy member that constitutes another part of the heat transfer device and is arranged in a region occupied by the heat transfer device in which the amount of wear by solid particles in the gas is larger than the other regions. The heat transfer device is installed in the flow path through which the gas flows along the horizontal direction, and the dummy member forms a surface along the horizontal direction above the floor surface of the duct constituting the flow path. Are arranged, and in the flow path, heat transfer units constituting the heat transfer device are arranged so as to be stacked vertically via a partition plate, and the heat transfer units in the heat transfer unit are arranged above and below the partition plate. It is applied to the heat recovery device in which the dummy member is arranged so as to form a surface along the horizontal direction.

In the heat recovery device of the present invention, it is preferable that the members constituting the heat transfer material are evenly arranged in the region where the heat transfer material is arranged in the heat transfer device.

In the heat recovery device of the present invention, the heat transfer material may be a heat transfer tube through which a heat medium flows, and the dummy member may be a dummy tube through which a heat medium does not flow.

In the heat recovery device of the present invention, the dummy member can be a dummy plate provided with a hole through which gas flows.

According to the heat recovery device of the present invention, it is possible to exert an excellent effect that wear of the heat transfer material can be effectively suppressed.

It is a side sectional view which shows the form of the heat recovery device according to 1st Example of this invention. It is an enlarged view which shows the main part of FIG. It is a perspective view which shows the form of the main part of the heat recovery device according to 1st Example of this invention. It is a side sectional view which shows the form of the heat recovery device according to 2nd Example of this invention. It is an enlarged view which shows the main part of FIG. It is a side sectional view which shows the form of the heat recovery device according to the 3rd Example of this invention. It is an enlarged view which shows the main part of FIG. It is a normal cross-sectional view which shows the form of the main part of the heat recovery device according to the 3rd Example of this invention, and is the figure corresponding to the arrow VIII-VIII of FIG. It is a side sectional view which shows the form of the heat recovery device according to 4th Example of this invention. It is an enlarged view which shows the main part of FIG. It is a normal cross-sectional view which shows the form of the main part of the heat recovery device according to 4th Example of this invention, and is the figure corresponding to XI-XI arrow of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 3 show an example of a form of a heat recovery device according to the implementation of the present invention. As shown in FIG. 1, the heat recovery device 1 of the first embodiment is configured by installing a heat transfer device 3 in a duct 2 forming a flow path of gas G such as coal combustion exhaust gas. In the first embodiment, the case where the gas G flows along the horizontal direction is illustrated in the duct 2 installed in the horizontal direction. In the first embodiment and the second embodiment described later, the flow direction of the gas G will be described as the front-rear direction, and the horizontal direction orthogonal to the flow direction of the gas G will be described as the left-right direction.

The heat transfer device 3 includes a large number of heat transfer tubes 4 in the space through which the gas G flows as a heat transfer material for exchanging heat with the gas G. The area occupied by the heat transfer tube 4 in the heat transfer device 3 is a part, and the dummy member 5 is arranged in the other part where the heat transfer tube 4 is not provided. In FIG. 1, for convenience of explanation, the heat transfer material 4 and the dummy member 5 are shown only for a part of the heat transfer device 3 (one heat transfer unit 8), but other heat transfer units 8 are also shown. Of course, the heat transfer material 4 and the dummy member 5 are arranged in the same manner. This also applies to FIGS. 4, 6 and 9 below. Further, the fins 6, the dummy plate 24, the holes 44c, and the like, which will be described later, are also partially omitted in each drawing.

As shown in FIG. 3, for example, the heat transfer tubes 4 that form a part of the heat transfer device 3 are formed so that each one meanders along the horizontal plane and extends in the left-right direction. That is, each heat transfer tube 4 reaches the bent portion 4b on one end side of one straight line portion 4a extending in the left-right direction, is folded back at the bent portion 4b, and then extends to the other end side as another straight line portion 4a. In shape, it meanders on a horizontal plane. Fins 6 projecting in the radial direction over the entire length in the left-right direction are formed on the surface of the straight portion 4a to secure a contact area with the gas G. The heat transfer tube 4 is made of a material having high thermal conductivity, such as metal. A heat medium L circulates inside the heat transfer tube 4, and the heat received from the gas G flowing outside the heat transfer tube 4 is transported to the outside by the heat transfer tube L.

Each heat transfer tube 4 meandering in the horizontal direction has both ends of each straight line portion 4a fixed by a support 7. The support 7 is a plate-shaped member having a surface in a direction orthogonal to the straight portion 4a of each heat transfer tube 4. Each heat transfer tube 4 is fixed to the support 7 so as to penetrate the support 7 at both ends of the straight portion 4a, and the heat transfer tubes 4 installed in a plurality of stages in the vertical direction are fixed to the same support 7. , A bundle 8 is formed as a heat transfer unit constituting the heat transfer device 3. In each bundle 8, the straight portion 4a of the heat transfer tube 4 extending in the left-right direction is evenly arranged in the vertical and front-rear directions. That is, the distances between the straight line portions 4a in each bundle 8 in the vertical direction and the front-rear direction are set to be equal.

As shown in FIG. 1, a plurality of bundles 8 are stacked vertically in the duct 2 and are installed in a plurality of stages in the front-rear direction to form a heat transfer device 3. A partition plate 9 forming a surface along the horizontal direction is arranged between the bundles 8 stacked in the vertical direction.

The bundles 8 adjacent to each other in the front-rear direction are installed so as to be separated from each other at a predetermined interval, and the soot blower 10 is arranged in the space between the bundles 8 adjacent to each other in the front-rear direction as shown in FIG. The soot blower 10 blows steam or the like onto the bundle 8 from a tube that expands and contracts along the left-right direction (direction orthogonal to the paper surface of FIG. 1), and adheres to the heat transfer tube 4 and the dummy tube 5 constituting the bundle 8. A device that blows away solid particles. When the gas G is a combustion exhaust gas such as coal, the gas G contains soot and dust as solid particles. When solid particles adhere to the surface of the heat transfer tube 4 and accumulate between the fins 6, heat exchange between the gas G and the heat medium L (see FIG. 3) via the fins 6 is hindered. The soot blower 10 is a device for removing solid particles before they accumulate on the fins 6 in order to avoid such a situation.

In the case of the first embodiment, the dummy member 5 forming a part of the heat transfer device 3 together with the heat transfer tube 4 is configured as a dummy tube similar to the heat transfer tube 4. As shown in FIG. 3, the dummy tube 5 includes a straight line portion 5a similar to the heat transfer tube 4, and the straight line portion 5a is arranged so as to extend in a direction orthogonal to the flow direction of the gas G. However, since the heat medium L does not flow through the dummy tube 5, it is not necessary for the straight portions 5a to be connected to each other, and the dummy tube 5 is not provided with a portion corresponding to the bent portion 4b of the heat transfer tube 4. Further, since the dummy tube 5 of the first embodiment does not have a function of exchanging heat, the fins 6 provided in the straight portion 4a of the heat transfer tube 4 are provided in the straight portion 5a of the dummy tube 5. Is not formed. In each dummy tube 5, both ends of the straight line portion 5a are fixed by a support tool 7 that supports the heat transfer tube 4, and the bundle 8 is formed together with the heat transfer tube 4.

The position where the dummy tube 5 is arranged is a portion of the area occupied by the heat transfer device 3 that is particularly susceptible to wear. In the case of the first embodiment, dummy tubes 5 are arranged in place of the heat transfer tubes 4 at the upper and lower parts of each bundle 8.

In the first embodiment, as shown in FIG. 1, the gas G circulates in the horizontal direction through the duct 2 arranged in the horizontal direction. Therefore, the solid particles contained in the gas G are deposited on the floor surface 2a of the duct 2 forming a surface along the horizontal direction. Similarly, solid particles are deposited on the partition plate 9 forming a horizontal surface. The deposited solid particles are wound up by the operation of the soot blower 10 and the flow of the gas G, and come into contact with the material constituting the heat transfer device 3 to be worn. In the case of the heat transfer device 3 as in the first embodiment, since many solid particles are distributed on the floor surface 2a and the partition plate 9, the degree of wear due to the solid particles is the largest in the vicinity of the floor surface 2a and the partition plate 9. .. Therefore, the upper part of the floor surface 2a and the upper and lower parts of each bundle 8 corresponding to the upper and lower parts of the partition plate 9 are used as dummy tubes 5 to prevent the heat transfer tube 4 from being significantly worn.

Specifically, as shown in FIG. 2, the heat transfer tubes 4 to dummy tubes 5 constituting each bundle 8 are installed in a total of 4 or more and 40 or less stages for each bundle 8. Of these, it is preferable to arrange dummy tubes 5 having one or more stages and four or less stages in the upper part and the lower part of each bundle 8, and arrange heat transfer tubes 4 in the remaining parts. In the heat transfer device 3 of the first embodiment, each bundle 8 is provided with a total of 6 stages of heat transfer tubes 4 and dummy tubes 5, of which the upper one stage and the lower two stages are dummy tubes 5, and the other stages. Is configured as a heat transfer tube 4.

In this way, even if the soot blower 10 is operated, if the dummy tube 5 is provided instead of the heat transfer tube 4 in the area occupied by the heat transfer device 3 in which the amount of wear is larger than that of the other parts, the soot blower 10 can be operated. The dummy tube 5 bears most of the wear caused by the solid particles in the gas G. As a result, the wear of the heat transfer tube 4 is remarkably reduced, and situations such as damage to the heat transfer tube 4 and leakage of the heat medium L are avoided.

Here, in the bundle 8, the straight portions 4a of the heat transfer tubes 4 are evenly arranged as described above. As for the dummy tube 5, the shape and dimensions of the straight portion 5a are similar to those of the straight portion 4a, and the arrangement intervals between the straight portions 4a and 5a are even throughout the bundle 8. The dummy tube 5 is made of, for example, the same metal as the heat transfer tube 4, but the dummy tube 5 may be formed of a material having higher wear resistance than the material constituting the heat transfer tube 4.

In this way, the flow of the gas G passing through the heat transfer device 3 can be kept as uniform as possible. If the shapes, dimensions, arrangement intervals, etc. of the straight portions 4a and 5a differ greatly between the heat transfer tube 4 and the dummy tube 5, the flow velocity of the gas G in the bundle 8 differs for each portion, and as a result, the gas G There is a risk of drift in the flow. As a result, there is a possibility that a new portion having a large amount of wear will be generated around the drift. That is, the dummy tube 5 is installed in a region where the amount of wear is particularly large even in the heat transfer device 3 in order to take over the wear that may occur in the heat transfer tube 4, but by temporarily installing the dummy tube 5, the gas G can be used. If the flow changes, a region with a large amount of wear may occur in a part different from the original intention of the design. Therefore, in the present invention, the dummy tube 5 is installed by using parts having the same shape and dimensions as the heat transfer tube 4 and arranging the dummy tube 5 in place of a part of the heat transfer tube 4, so that the dummy tube 5 can be installed in the gas G. It avoids affecting the flow of. By doing so, it is easy to keep the flow of the gas G uniform between the heat transfer tube 4 and the dummy tube 5. Further, in designing and manufacturing the heat transfer device 3, since the dummy tube 5 can be installed by diverting the parts used for the heat transfer tube 4, it is advantageous in terms of manufacturing cost, parts management, and labor for assembly.

Of course, the shape and dimensions of the dummy tube 5 do not necessarily have to be the same as those of the heat transfer tube 4, and a dummy tube 5 having a configuration different from that of the heat transfer tube 4 may be used. In that case, by appropriately adjusting the shape, dimensions, arrangement, etc. of the dummy tube 5, the resistance of the air flow in the dummy tube 5, the flow rate of the gas G, etc. are set to be about the same as those of the heat transfer tube 4 so that a large drift does not occur. It is possible. Further, as in the third and fourth embodiments described later, parts having a shape other than the tubular shape can be used as the dummy member.

Here, if the dummy tube 5 is installed instead of the heat transfer tube 4 as in the first embodiment, it is undeniable that the amount of heat exchange per space in the heat transfer device 3 is reduced by the amount of the dummy tube 5. As a measure against such a decrease in the amount of heat exchange, the total heat transfer area may be increased to satisfy the required amount of heat exchange by, for example, increasing the total number of bundles 8 installed.

As the installation position of the dummy pipe 5, in the first embodiment, a location corresponding to the floor surface 2a of the duct 2 or the vicinity of the partition plate 9 is illustrated, but in carrying out the present invention, the portion where the dummy member is installed is here. It is not limited to the example shown. The dummy member can be arranged at an appropriate position in the heat transfer device 3 depending on conditions such as the shape of the duct 2 as the flow path of the gas G and the arrangement of the heat transfer device 3. For example, in the duct 2 of the first embodiment, it is assumed that a biased flow of gas G occurs near the side wall, but the wear generated on the material of the heat transfer device 3 becomes large near the side wall of the duct 2. In that case, a dummy member may be installed near the side wall. Further, as in the third and fourth embodiments described later, when the amount of wear is large in the vicinity of the operating region of the soot blower, a dummy member may be arranged in the vicinity of the operating region of the soot blower. In any case, as the portion of the heat transfer device on which the dummy member is arranged, a region occupied by the heat transfer device, which has a larger amount of wear than the other regions, may be selected. At that time, for example, by referring to the actual results of the amount of wear for each part in a similar heat transfer device in the past, or by conducting a test using a model or an actual machine, the part with a large amount of wear can be identified and the dummy member can be arranged. The location can be determined.

As described above, the heat recovery device 1 of the first embodiment described above includes a flow path 2 through which the gas G containing solid particles flows, a heat transfer device 3 installed in the flow path 2, and the heat transfer. A part of the device 3, a heat transfer material 4 that exchanges heat with the gas G passing through the heat transfer device 3, and another part of the heat transfer device 3 are formed, and the area occupied by the heat transfer device 3 Among them, a dummy member 5 is provided, which is arranged in a region where the amount of wear due to solid particles in the gas G is larger than the other regions. In this way, the dummy member 5 bears most of the wear caused by the solid particles in the gas G, so that the wear of the heat transfer tube 4 is remarkably reduced.

In the first embodiment, the members (straight line portions 4a) constituting the heat transfer material 4 are evenly arranged in the region where the heat transfer material 4 is arranged in the heat transfer device 3. This is suitable for keeping the flow of the gas G passing through the heat transfer device 3 as uniform as possible.

In the first embodiment, the heat transfer device 3 is installed in the flow path 2 through which the gas G flows along the horizontal direction, and the dummy member is above the floor surface 2a of the duct constituting the flow path 2. 5 is arranged. In this way, the dummy member 5 can bear the wear generated above the floor surface 2a of the duct 2, which is a region where the amount of wear is large.

In the first embodiment, the heat transfer units 8 constituting the heat transfer device 3 are arranged in the flow path 2 so as to be stacked vertically via the partition plate 9, and the partition in the heat transfer unit 8 is arranged. The dummy members 5 are arranged above and below the plate 9. In this way, the dummy member 5 can bear the wear generated above and below the partition plate 9, which is a region where the amount of wear is large.

In the first embodiment, the heat transfer material 4 has a heat transfer tube through which the heat medium L flows, and the dummy member 5 has a dummy tube through which the heat medium L does not flow. This is suitable for maintaining uniformity in the flow of gas G between the heat transfer tube 4 and the dummy tube 5. Further, since the dummy tube 5 can be installed by diverting the parts used for the heat transfer tube 4, it is advantageous in terms of manufacturing cost, parts management, and labor for assembly.

Therefore, according to the first embodiment, the wear of the heat transfer material can be effectively suppressed.

4 and 5 show a heat recovery device according to a second embodiment of the present invention. The heat recovery device 21 of the second embodiment has the same basic configuration as that of the first embodiment (see FIGS. 1 to 3), including the shape of the duct 2. However, in the case of the second embodiment, unlike the first embodiment, the heat transfer device 22 is provided with a dummy plate 24 as a dummy member at the upper and lower portions of each bundle 23 corresponding to a region where the amount of wear is large. There is.

The dummy plate 24 is, for example, a plate-shaped member made of metal. The dummy plate 24 is installed at the same position as the dummy pipe 5 (see FIG. 1) in the first embodiment, that is, above and below the partition plate 9, and on the floor surface 2a of the duct 2. In the case of the second embodiment, in each bundle 23, three dummy plates 24 forming a surface along the direction orthogonal to the front-rear direction are installed above and below the region where the heat transfer tube 4 is arranged. The three upper and lower dummy plates 24 of each bundle 23 are arranged on the front surface and the back surface of the bundle 23, and at the intermediate portion in the front-rear direction, respectively.

The height of each bundle 23 is about 4 or more and 40 or less in terms of the number of stages of the heat transfer tube 4. Of these, the dummy plate 24 occupies the height of one step or more and four steps or less above and below each bundle 23, and the heat transfer tube 4 is arranged in the remaining portion. In the heat transfer device 22 shown in FIGS. 4 and 5, the height of each bundle 23 is 6 steps in terms of the number of steps of the heat transfer tube 4, of which 1 step at the top and 2 steps at the bottom are dummy plates 24. The remaining three stages are configured as the heat transfer tube 4.

As shown in FIG. 5, each dummy plate 24 is opened with a large number of holes 24a so as to penetrate the dummy plate 24 back and forth. Therefore, the gas G flowing through the duct 2 can pass not only between the heat transfer tubes 4 but also through the hole 24a of the dummy plate 24. If the dummy plate 24 is configured without the holes 24a, the gas G has no choice but to bypass the dummy plate 24 and pass between the heat transfer tubes 4. As a result, the gas G may have a drift in the bundle 23 or the heat transfer device 22, and a new portion having a large amount of wear may be generated. The hole 24a is provided to avoid such a situation.

Then, in the second embodiment, by appropriately setting the dimensions and number of the holes 24a provided in the dummy plate 24 and the arrangement in the dummy plate 24, the gas G is formed between the dummy plate 24 and the installation area of the heat transfer tube 4. The flow velocity, flow rate, resistance, etc. can be adjusted to be as uniform as possible. Further, since the dummy plate 24 has a simple structure in which a hole 24a is opened in the plate material, the dummy member 24 can be easily manufactured at low cost when the heat transfer device 22 is provided with the dummy member 24, and the heat recovery device is provided. The cost of installing the 21 can be reduced.

Here, the dimensions and arrangement of the holes 24a may be changed for each dummy plate 24 at each bundle 23 or the heat transfer device 22. For example, in the dummy plate 24 on the upstream side of the gas G, the size or number of the holes 24a may be larger or larger than that on the dummy plate 24 on the downstream side. As described above, in the second embodiment, the flow rate of the gas G passing through the installation area of the dummy plate 24 can be adjusted by changing the setting of the hole 24a.
Further, regarding the dummy plate 24, the case where three dummy plates are installed above and below each bundle 23 is illustrated here, but the configuration of the dummy plate 24 is not limited to this. The number and arrangement of the dummy plates 24 in each bundle 23 can be appropriately set according to the flow rate of the gas G and other conditions required in the area where the dummy plates 24 are installed.

In each bundle 23, it is preferable to provide a gap of about 10 cm or more larger than 0 between the dummy plate 24 and the floor surface 2a or the partition plate 9 located below the dummy plate 24. At the time of maintenance or the like, solid particles accumulated on the floor surface 2a or the partition plate 9 can be easily removed by inserting a cleaning tool or the like through the gap or sending air or the like.

As described above, in the heat recovery device 21 of the second embodiment, the dummy member 24 is a dummy plate provided with a hole 24a through which the gas G flows. By doing so, the flow velocity of the gas G and the flow velocity of the gas G can be increased by appropriately setting the dimensions and number of the holes 24a, the arrangement of the holes 24a in the dummy plate 24, the arrangement and the number of the dummy plates 24 in the bundle 23 or the heat transfer device 22, and the like. The flow rate, resistance, etc. can be adjusted to be as uniform as possible. Further, since the dummy member 24 can be manufactured easily at low cost, the cost for installing the heat recovery device 21 can be reduced.

Since the other configurations and working effects are the same as those in the first embodiment, the description thereof will be omitted, but the wear of the heat transfer material can be effectively suppressed by the second embodiment as well.

6 to 8 show the form of the heat recovery device according to the third embodiment of the present invention. In the case of the heat recovery device 31 of the third embodiment, as shown in FIGS. 6 and 7, the case where the gas G flows in the vertical direction in the duct 33 in which the heat transfer device 32 is installed is illustrated. There is. In the third embodiment and the fourth embodiment described later, since the direction along the vertical direction is the flow direction of the gas G, the direction in which the straight portion 4a of the heat transfer tube 4 extends in the heat transfer device 32. Is defined as the left-right direction, and the horizontal direction orthogonal to the left-right direction is described as the front-back direction.

As shown in FIGS. 7 and 8, the heat transfer device 32 is composed of a plurality of heat transfer tubes 4 as heat transfer materials and a bundle 35 formed by fixing a dummy tube 34 as a dummy member with a support 7. .. Such a configuration is common to the heat transfer device 3 of the first embodiment (see FIGS. 1 to 3). However, the area where the dummy tube 34 is arranged in the heat transfer device 32 is different from the area where the dummy tube 5 is arranged in the heat transfer device 3 of the first embodiment. This is because the flow direction of the gas G in the third embodiment is different from that in the first embodiment, and as a result, the portion occupied by the heat transfer device 32 that is easily worn is different.

In the case of the third embodiment, as shown in FIG. 6, a plurality of bundles 35 are arranged vertically and in a plurality of stages in the front-rear direction in the duct 33 extending in the vertical direction, and the heat transfer device 32 is installed. It is configured. Between the bundles 35 arranged in the front-rear direction, partition plates 36 forming vertical faces orthogonal to the front-rear direction are arranged.

The bundles 35 adjacent to each other in the vertical direction are arranged apart from each other at a predetermined interval, and the soot blower 10 is installed in the space above each bundle 35. As shown in FIG. 8, the soot blower 10 blows steam or the like onto the bundle 35 (see FIG. 6) located below while expanding and contracting between the bundles 35 in the left-right direction.

Then, in the third embodiment, in each bundle 35, the dummy pipe 34 is arranged in a portion near the operating region of the soot blower 10. Specifically, as shown in FIGS. 7 and 8, a dummy tube 34 is installed in place of the heat transfer tube 4 in a part of the bundle 35 that occupies the upper part and is below the soot blower 10.

The dummy tube 34 includes a wire portion 34a similar to the heat transfer tube 4, and both ends of the straight line portion 34a are fixed to the support 7 together with the heat transfer tube 4. However, the heat medium L does not circulate in the dummy tube 34, and the fin 6 is not provided.

The soot blower 10 operates so as to blow steam or the like downward while expanding and contracting in the left-right direction as described above. Therefore, the flow rate of steam or the like blown from the soot blower 10 to the bundle 35 is the largest below the soot blower 10. As a result, in the third embodiment, the amount of wear generated in the material of the bundle 35 increases below the soot blower 10. Therefore, a part of the heat transfer tube 4 corresponding to the upper part of each bundle 35 is replaced with a dummy tube 34 so that the wear can be taken over.

In the third embodiment, the heat transfer tubes 4 to the dummy tubes 34 constituting each bundle 35 are installed in a total of 4 steps or more and 40 steps or less for each bundle 35, and a part of each bundle 35 corresponding to the upper part. A dummy tube 34 is arranged in the area. The position of the dummy tube 34 is a portion below the soot blower 10 located above the bundle 35. Then, among the heat transfer tubes 4 constituting the bundle 35, a region of about 1 or more and 10 or less in the straight line portion 4a centered on the position directly below the soot blower 10 may be replaced with the dummy tube 34. In the heat transfer device 32 of the third embodiment, as shown in FIGS. 7 and 8, each bundle 35 is provided with a total of 6 stages of heat transfer tubes 4 and dummy tubes 34, of which a part of the upper part is a dummy tube 34. The three straight portions 34a constituting the above occupy. That is, two straight portions 34a of the dummy pipe 34 are located at the uppermost stage of the bundle 35 at a position below the soot blower 10, and two straight portions 34a of the dummy pipe 34 are located at a position below the soot blower 10 at the second stage from the top. Is located.

As described above, in the heat recovery device 31 of the third embodiment, the heat transfer unit 35 constituting the heat transfer device 32 is installed in the flow path 33 through which the gas G flows in the vertical direction, and the heat transfer unit 35 is installed. A soot blower 10 for blowing off solid particles accumulated on the heat transfer unit 35 is arranged above the heat transfer unit 35, and the dummy member 34 is arranged in a region of the heat transfer unit 35 below the soot blower 10. There is. In this way, the dummy member 34 can bear the wear generated below the soot blower 10 in the region where the amount of wear is large.

Since the other configurations and working effects are the same as those in the first and second embodiments, the description thereof will be omitted, but the wear of the heat transfer material can be effectively suppressed by the third embodiment as well.

9 to 11 show the form of the heat recovery device according to the fourth embodiment of the present invention. The heat recovery device 41 of the fourth embodiment has the same basic configuration as that of the third embodiment (see FIGS. 6 to 8), including the shape of the duct 33. However, the fourth embodiment is different from the third embodiment in that a dummy plate 44 is provided as a dummy member on the upper part of each bundle 43 corresponding to a region where the amount of wear is large in the heat transfer device 42.

The dummy plate 44 is installed at the same position as the dummy pipe 34 (see FIGS. 6 to 8) in the third embodiment, that is, in a partial area in the upper part of each bundle 43. In the fourth embodiment, the heat transfer tubes 4 constituting each bundle 43 are installed in about 4 stages or more and 40 stages or less for each bundle 43. Then, in the heat transfer tube 4 constituting the bundle 43, a dummy plate 44 is installed instead of the heat transfer tube 4 in a region of about 1 or more and 10 or less in the straight line portion 4a centering on the position directly below the soot blower 10. Will be done.

The dummy plate 44 is arranged on three surfaces so as to surround the position directly below the soot blower 10 in the bundle 43. That is, as shown in FIGS. 10 and 11, the dummy plate 44 has a bottom surface 44a forming a horizontal plane extending in the left-right direction at a position directly below the soot blower 10, and extends diagonally upward from the front-rear end of the bottom surface 44a toward the outside. It is provided with two side surfaces 44b, and the bottom surface 44a and the two side surfaces 44b form a hat-shaped cross section as a whole. The left and right ends of the dummy plate 44 are fixed to the support 7 together with the heat transfer tube 4.

A large number of holes 44c are opened in the bottom surface 44a and the side surface 44b constituting the dummy plate 44 so as to penetrate the bottom surface 44a and the side surface 44b vertically or back and forth. The flow of steam or the like injected from the soot blower 10 to the bundle 43 collides with the dummy plate 44, passes through the hole 44c, and spreads to the region where the heat transfer tube 4 is installed, and solid particles are emitted from the surface of the heat transfer tube 4. Can be blown away. At this time, most of the strong flow injected from the soot blower 10 comes into contact with the dummy plate 44 located in the vicinity of the soot blower 10 before being blown to the heat transfer tube 4. As a result, the dummy plate 44 takes over most of the wear caused by the strong air flow, and the wear of the heat transfer tube 4 can be reduced.

Since the other configurations and working effects are the same as those in the first to third embodiments, the description thereof will be omitted, but the wear of the heat transfer material can be effectively suppressed by the fourth embodiment as well.

The heat recovery device of the present invention is not limited to the above-described embodiment. For example, as the heat transfer material, a member having various shapes or structures such as a plate-shaped heat transfer plate can be adopted in addition to the heat transfer tube. Further, as the dummy member, a member having various shapes and structures can be adopted in addition to the dummy tube and the dummy plate as described above. In addition, in carrying out the heat recovery device of the present invention, it goes without saying that various changes can be made without departing from the gist of the present invention.

1 Heat recovery device 2 Flow path (duct)
2a Floor surface 3 Heat transfer device 4 Heat transfer material (heat transfer tube)
5 Dummy member (dummy tube)
8 Heat transfer unit (bundle)
9 Partition plate 10 Soot blower 21 Heat recovery device 22 Heat transfer device 23 Heat transfer unit (bundle)
24 Dummy member (dummy plate)
24a hole 31 heat recovery device 32 heat transfer device 33 flow path (duct)
34 Dummy member (dummy tube)
35 Heat transfer unit (bundle)
41 Heat recovery device 42 Heat transfer device 43 Heat transfer unit (bundle)
44 Dummy member (dummy plate)
44c hole G gas L heat medium

Claims (4)

A flow path through which gas containing solid particles flows and
The heat transfer device installed in the flow path and
A heat transfer material that constitutes a part of the heat transfer device and exchanges heat with the gas passing through the heat transfer device.
It is provided with a dummy member that constitutes another part of the heat transfer device and is arranged in a region occupied by the heat transfer device in which the amount of wear by solid particles in the gas is larger than the other regions .
The heat transfer device is installed in the flow path through which the gas flows in the horizontal direction, and the dummy member is arranged above the floor surface of the duct constituting the flow path so as to form a surface along the horizontal direction. At the same time
In the flow path, heat transfer units constituting the heat transfer device are arranged so as to be stacked vertically via a partition plate, and surfaces along the horizontal direction above and below the partition plate in the heat transfer unit. A heat recovery device in which the dummy member is arranged so as to form a. The heat recovery device according to claim 1, wherein the members constituting the heat transfer material are evenly arranged in the region where the heat transfer material is arranged in the heat transfer device. The heat recovery device according to claim 1 or 2 , wherein the heat transfer material is a heat transfer tube through which a heat medium flows inside, and the dummy member is a dummy tube through which a heat medium does not flow inside. The heat recovery device according to claim 1 or 2 , wherein the dummy member is a dummy plate provided with a hole through which gas flows.

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