TWI744815B - Boiler plant - Google Patents

Abstract

Provide boiler equipment that can reduce damage to the boiler body when an earthquake occurs. The boiler device includes: a boiler body (1), which has a furnace (2) and a cage part (3) located at the rear of the furnace; and a plurality of steel columns (12), which are arranged around the boiler body and support the boiler body; It is characterized by having: a plurality of back brackets (20), which respectively connect the left and right water walls (2a) of the furnace and the left and right cage walls (3a) of the cage, and extend in the horizontal direction; and a plurality of connections The members (13a, 15a) connect each of the plurality of back brackets with the plurality of steel columns provided on the left and right sides of the boiler body.

Description

Boiler plant

The present invention relates to a boiler device, and particularly relates to a supporting structure of the boiler body.

Normally, the boiler body is equipped with a furnace and a cage, and the boiler body is suspended and supported on a steel beam through a boom. In order to prevent the boiler body from shaking when an earthquake occurs, the steel column and the boiler body are connected by seismic belts.

In addition, as a vibration-damping support structure of a boiler that reduces the response load when an earthquake occurs, for example, Patent Document 1 describes a structure in which the furnace and the cage of the boiler body are connected by a connecting device. The connecting device is configured to produce weak resistance to the slow relative displacement caused by the heat of the furnace and the cage, or not to produce resistance, but to react to the rapid relative displacement when an earthquake occurs. Produce greater resistance. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 3181369

[The problem to be solved by the invention]

The stove is a hollow box-shaped structure surrounded by a water wall formed by connecting heat pipes with boiler water flowing inside with a membrane rod. On the other hand, the cage is provided for the box-shaped structure Among the heat pipe groups for convective heat conduction. Therefore, there is a big gap between the mass per unit volume of the furnace (mass density) and the mass density of the cage. Specifically, the mass density of the stove is very small compared to the mass density of the cage.

Therefore, when an earthquake occurs, the furnace and the cage will vibrate at a natural frequency according to their respective rigidity and mass. For example, the secondary side wall or the nose set between the furnace and the cage will be damaged by applying local stress. The fear. In order to prevent this problem, it is better to make the furnace and the cage vibrate in the same phase as possible, so that the movements of the furnace and the cage are integrated.

In Patent Document 1, regarding the phase difference between the furnace and the cage when an earthquake occurs, the restraining force generated by the connecting device can make the operation of the furnace and the cage close to be integrated, but in order to further reduce the damage to the boiler body, it is also There is room for improvement.

The present invention was made in view of this situation, and its object is to provide a boiler device that can reduce damage to the boiler body when an earthquake occurs. [Technical means to solve the problem]

In order to achieve the above-mentioned object, a representative of the present invention is a boiler device, which includes: a boiler body having a furnace and a cage located at the rear of the furnace; and a plurality of steel columns arranged around the boiler body to support the foregoing Boiler body; characterized by having: a plurality of back brackets, which respectively connect the left and right water walls of the furnace and the left and right cage walls of the cage, and extend in the horizontal direction; and a plurality of connecting members, which will Each of the plurality of back supports is connected to the plurality of steel columns provided on the left and right sides of the boiler body. Here, it is preferable that the aforementioned plurality of connecting members are all composed of seismic belts, or all of them are composed of dampers, or are composed of a combination of seismic belts and dampers. [Effects of Invention]

According to the present invention, damage to the boiler body when an earthquake occurs can be reduced. In addition, the problems, structures, and effects other than the above are clarified from the description of the following embodiments.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 7. Fig. 1 is a side view showing the overall structure of the boiler device of this embodiment, Fig. 2 is a plan view of the boiler device shown in Fig. 1, and Fig. 3 is a diagram showing the arrangement of the side and back brackets of the boiler body shown in Fig. 1 4 is a perspective view of the back bracket shown in FIG. 3, FIG. 5 is a VV cross-sectional view of FIG. 3, FIG. 6 is a perspective view of the main part of the mounting mechanism of the back bracket, and FIG. 7 is a perspective view of the mounting mechanism shown in FIG. Longitudinal section view of the main parts. In addition, in the following description, the directions of front and rear, left and right, and up and down are defined as shown in FIGS. 1 and 2.

As shown in FIGS. 1 and 2, the boiler device of the present embodiment includes a boiler body 1 and a plurality of steel columns 12 provided to surround the boiler body 1 and support the boiler body 1. The boiler body 1 is suspended from a plurality of steel beams 11 bridged above the plurality of steel columns 12 through a plurality of booms 10. The boiler body 1 includes a stove 2, a cage 3, and a sub-side wall 4 connecting the stove 2 and the cage 3. Also, the symbol 5 is the nose. The furnace 2 is surrounded by a water wall 2a (refer to FIGS. 6 and 7), and the water wall 2a is formed by welding and fixing heat transfer pipes 7 with boiler water flowing therein with a membrane rod 8. The cage 3 is also surrounded by a cage wall 3a having the same structure as the water wall 2a. The stove 2 is made of a hollow box-shaped structure, but the cage 3 is in the hollow box-shaped structure, and is provided with a heat conduction tube group (not shown) for conducting convective heat conduction. Therefore, the mass per unit volume (mass density) of the furnace 2 is very small compared to the mass density of the cage 3.

The furnace 2 is connected to a plurality of steel pillars 12 provided in front of the furnace 2 through a plurality of seismic belts 13b (second seismic belt). In more detail, the back bracket 20 and the steel column 12 provided on the water wall 2a of the furnace 2 are connected by the seismic belt 13b. In addition, the cage 3 is connected to a plurality of steel columns 12 provided behind the cage 3 through a plurality of seismic belts 13c (third seismic belt). In more detail, the back bracket 20 and the steel column 12 provided on the cage wall 3a are connected by the seismic belt 13c.

In addition, the water walls 2a on the left and right of the furnace 2 and the cage walls 3a on the left and right of the cage 3 are connected by a plurality of back brackets 20 extending in the horizontal direction. The plurality of steel columns 12 are connected by a plurality of seismic belts 13a (first seismic belt). The seismic belt 13a corresponds to the "connecting member" of the present invention. In addition, the number of earthquake-resistant belts 13a, 13b, and 13c may be appropriate.

In addition, a plurality of dampers 15 (second dampers) are provided between the furnace 2 and the cage 3 along the front-rear direction. Specifically, two dampers 15 are provided in the vertical direction (refer to FIG. 1), and two are provided in the left-right direction (refer to FIG. 2), but there is no problem with these numbers. In addition, one end of each damper 15 is fixed to the back bracket 20 installed on the water wall 2a, and the other end is fixed to the back bracket 20 installed on the cage wall 3a. Here, as the damper 15, a hydraulic damper or a viscoelastic damper can be used. By using a hydraulic damper or a viscoelastic damper, the displacement caused by the thermal deformation of the furnace 2 and the cage 3 can be allowed, and the larger displacement caused by the earthquake can be restricted. In particular, if a viscoelastic damper is used, it will act quickly during an earthquake, and the relative displacement of the furnace 2 and the cage 3 can be restricted, so it is preferable.

Next, the installation position of the damper 15 will be described in detail. The upper damper 15 is provided at a position lower than the bottom part of the auxiliary side wall 4 connected to the stove 2 and at a height near the curved part of the nose 5 (L2). The lower damper 15 is arranged below the upper damper 15 and at a height position (L1) that can connect the carcass of the furnace 2 and the cage 3. As mentioned above, two dampers 15 are provided at the height position L1 and the height position L2, thereby effectively suppressing the relative deformation of the stove 2 and the cage 3 during an earthquake. And, in the left-right direction, the seismic belt 13b between the furnace 2 and the steel column 12, the damper 15, the seismic belt 13c between the cage 3 and the steel column 12 are arranged approximately extending in the front-rear direction when viewed from above. On the same straight line M1 and M2 (refer to Fig. 2). Therefore, during an earthquake, the vibration of the boiler body 1 in the front and rear directions can be effectively suppressed.

Next, the back stand 20 will be described. During the operation of the boiler body 1, the water wall 2a receives the furnace internal pressure generated by the combustion air and combustion gas inside the water wall 2a. The furnace internal pressure acts on the water wall 2a, the auxiliary side wall 4, and the cage wall 3a in a positive and negative form, so that the water wall 2a, the auxiliary side wall 4, and the cage wall 3a exhibit expansion or deformation behavior. Here, in order to prevent excessive deformation of the water wall 2a, the auxiliary side wall 4, and the cage wall 3a, the back bracket 20 is provided on the outer surfaces of the water wall 2a, the auxiliary side wall 4, and the cage wall 3a as shown in FIGS. That is, the outer surface of the boiler body 1. For example, as shown in FIG. 5, the four sides of the stove 2 are surrounded by the back bracket 20 to prevent the stove 2 from being deformed.

Next, the attachment mechanism 30 of the back bracket 20 will be described with reference to FIGS. 6 and 7. The back bracket 20 is made of H-shaped steel, and is installed on the water wall 2 a or the cage wall 3 a through the installation mechanism 30. The installation mechanism 30 applicable to the water wall 2a is the same as the installation mechanism 30 applicable to the cage wall 3a, so the installation mechanism 30 applicable to the water wall 2a is described here.

The mounting mechanism 30 includes: a pair of support blocks 31 arranged along the longitudinal direction of the heat pipe 7; a pin 32 inserted into the pair of support blocks 31; and a plate-shaped tie bar 33 mounted on the heat pipe 7 , Fixed by pin 32; vertical plate-shaped support 34, which is fixed to the tie bar 33; auxiliary support block 35, which is provided with a pair of upper and lower ends of the support 34, and supports the back bracket 20 in a pair of horizontal directions (In the direction of the arrow in Fig. 6) Sliding freely. The back bracket 20 is a structure that slides in the horizontal direction, so it can also prevent the boiler body 1 from being subjected to a large shock during an earthquake.

The boiler device constructed in this way, as shown in FIG. 2, the left and right side walls of the furnace 2, that is, the water wall 2a, and the left and right side walls of the cage 3, that is, the cage wall 3a are connected by a back bracket 20, which is connected to The steel column 12 is connected by the seismic belt 13a (the first seismic belt), so the furnace 2 and the cage 3 are integrated by the back bracket 20, so that the furnace 2 and the cage 3 vibrate in the same motion in the left-right direction. In other words, the furnace 2 and the cage 3 do not vibrate with their own natural vibration periods. As a result, it can be avoided that the stress is concentrated on the lower part of the connection part between the furnace 2 and the auxiliary side wall 4 (part A in FIG. 1), or the lower part of the connection part between the cage part 3 and the auxiliary side wall 4 (part B in Fig. 1) , Which can prevent damage to the part during an earthquake in advance.

In addition, the damper 15 is arranged in two stages at the height positions L1 and L2 in FIG. 1 between the furnace 2 and the cage 3, thereby suppressing the relative displacement of the two. In addition, the upper and lower positions of the seismic belts 13b, 13c (the second seismic belt, the third seismic belt) and the damper 15 (the second damper) are the same height positions L1 and L2, and the left and right positions are also viewed in a plan view. When being on the same straight line (M1, M2), the relative deformation of the furnace 2 and the cage 3 can be effectively suppressed. Furthermore, making the damper 15 a viscoelastic damper can improve the response during an earthquake and can more effectively suppress the relative deformation of the furnace 2 and the cage 3.

In addition, it is estimated that due to the earthquake, there will be cases where the seismic force component is larger in the front and rear directions than in the left and right directions. However, in this case, it is only necessary to increase the number of dampers 15 installed in the front and rear directions in FIG. 2 or increase The capacity of the damper 15 is sufficient.

(Modification 1) Next, the modification 1 of the above-mentioned embodiment will be described. Fig. 8 is a plan view of a boiler device of Modification 1. The boiler device of Modification 1 is characterized in that the plurality of connecting members that connect the left and right back brackets 20 and the steel columns 12 are composed of a plurality of seismic belts 13a (first seismic belt) and a plurality of dampers 15a ( The first damper) is combined to form a structure. In addition, the damper 15a, like the damper 15, is a hydraulic damper or a viscoelastic damper.

It is estimated that the seismic force component is larger in the left-right direction than the front-back direction due to the earthquake. Since there is a heavy object (horizontal coil) inside the cage 3 side, but there is no heavy object inside the furnace 2 side, when an earthquake occurs, the seismic force (inertial force) on the cage 3 side and the furnace The relationship between the seismic force on the side 2 (inertial force) is that the seismic force on the side of the cage 3 (inertial force)>the seismic force on the side of the stove 2 (inertial force). As the reaction force against the seismic force, when converted to the reaction force caused by the damper 15a (viscoelastic damper), the relationship becomes the reaction force on the side of the cage 3>reaction force on the side of the furnace 2.

In this case, a part of the plurality of seismic belts 13a shown in Fig. 2 is replaced with dampers 15a, which can be a structure suitable for bearing the seismic force components in the left and right directions. Specifically, as shown in FIG. 8, an anti-seismic belt 13a is provided on the left and right sides of the front side of the furnace 2, a damper 15a is provided on the left and right sides of the rear side of the furnace 2, and two dampers are provided on the left and right sides of the cage 3. 15a. With such a configuration, even if the seismic force component in the left and right directions is large, damage to the boiler body 1 can be reduced.

Here, all the seismic belts 13a may be replaced with dampers 15a. That is, all of the plural connecting members connecting the back bracket 20 and the steel column 12 may be constituted by the damper 15a.

(Modification 2) Next, the modification 2 of the above-mentioned embodiment will be described. Fig. 9 is a plan view of a boiler device according to Modification 2. The boiler device of Modification 2 differs from Modification 1 in that the back brackets 20a provided on the left and right water walls 2a of the furnace 2 and the back brackets 20b provided on the left and right cage walls 3a of the cage 3 are configured separately. Even with this configuration, damage to the boiler body 1 can be reduced when an earthquake occurs.

In addition, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the spirit of the present invention. All the technical matters included in the technical ideas described in the scope of the patent application are the objects of the present invention. The foregoing embodiments show appropriate examples, but those with ordinary knowledge in the technical field can implement various alternatives, amendments, modifications, or improvements based on the content disclosed in this specification. These applications are included in the appendix. The technical scope described in the patent scope.

For example, the present invention may be applied to the natural circulation type drum type (superheater hanging type) boiler shown in FIG. 10, or the straight-through type supercritical boiler shown in FIG. 11. In these cases, the damper 15 is set at the height positions L1 and L2 in the same way. In addition, in FIGS. 10 and 11, the illustration of the back bracket 20, the seismic belts 13b, 13c, and the steel column 12 shown in FIG. 1 is omitted.

1: Boiler body 2: stove 2a: water wall 3: Cage 3a: Cage wall 4: Secondary side wall 5: Nose 7: heat pipe 8: Film rod 10: boom 11: Steel beam 12: Steel column 13a: Seismic zone (Seismic zone 1) 13b: Seismic zone (Seismic zone 2) 13c: seismic belt (the third seismic belt) 15: Damper (2nd damper) 15a: Damper (1st damper) 20, 20a, 20b: back bracket 30: Installation mechanism 31: Support block 32: pin 33: Tie 34: support 35: auxiliary support block

[Fig. 1] A side view showing the overall structure of the boiler device of this embodiment. [Figure 2] A top view of the boiler plant shown in Figure 1. [Fig. 3] A diagram showing the arrangement of the side and back brackets of the boiler body shown in Fig. 1. [Figure 4] The perspective view of the back bracket shown in Figure 3. [Fig. 5] Fig. 3 is a cross-sectional view taken along the line V-V. [Figure 6] A perspective view showing the main part of the mounting mechanism of the back bracket. [Fig. 7] A longitudinal sectional view showing the main part of the mounting mechanism shown in Fig. 6. [Fig. 8] A plan view of the boiler device of Modification Example 1. [Fig. 9] A plan view of the boiler device of Modification Example 2. [Fig. 10] A side view showing the overall structure of a boiler device when the present invention is applied to a drum boiler. [Fig. 11] A side view showing the overall structure of a boiler device when the present invention is applied to a supercritical boiler.

1: Boiler body

2: stove

2a: water wall

3: Cage

3a: Cage wall

4: Secondary side wall

5: Nose

10: boom

11: Steel beam

12: Steel column

13b: Seismic zone (Seismic zone 2)

13c: seismic belt (the third seismic belt)

15: Damper (2nd damper)

20: back bracket

Claims (7)

A boiler device comprising: a boiler body having a furnace and a cage located at the rear of the furnace; and a plurality of steel pillars arranged around the boiler body to support the boiler body; characterized by: a plurality of steel pillars Back brackets, which respectively connect the left and right water walls of the furnace and the left and right cage walls of the cage, and extend in the horizontal direction; a plurality of connecting members, which connect each of the plurality of back brackets to the boiler The plurality of steel pillars on the left and right sides of the main body are connected; a plurality of second dampers are arranged between the furnace and the cage to connect the furnace and the cage; and a plurality of second seismic belts are connected The furnace is connected to the plurality of steel pillars arranged in front of the furnace; and a plurality of third seismic belts that connect the cage part and the plurality of steel pillars arranged behind the cage part. Two second dampers are arranged at different heights below the bottom of the secondary side wall that connects the furnace and the cage, and one of the plurality of second dampers is between the plurality of second seismic belts One of them is set at the same height position as one of the aforementioned plurality of third seismic belts. A boiler device includes: a boiler body having a furnace and a cage located at the rear of the furnace; and a plurality of steel pillars arranged around the boiler body to support the boiler body; characterized by: A plurality of back brackets respectively connect the left and right water walls of the furnace and the left and right cage walls of the cage, and extend in the horizontal direction; a plurality of connecting members, which connect each of the plurality of back brackets with each other The plurality of steel columns on the left and right sides of the boiler body are connected; a plurality of second dampers are arranged between the furnace and the cage to connect the furnace and the cage; and a plurality of second seismic belts, It connects the furnace and the plurality of steel pillars arranged in front of the furnace; and a plurality of third seismic belts connecting the cage part and the plurality of steel pillars arranged behind the cage part, The plurality of second dampers are arranged at different height positions below the bottom of the secondary side wall that connects the furnace and the cage, and one of the plurality of second dampers and the plurality of second earthquake-resistant One of the belts and one of the aforementioned plural third seismic belts are arranged on the same straight line when viewed from above. The boiler device according to claim 1 or 2, wherein the plurality of connecting members are all composed of the first seismic belt, or all are composed of the first damper, or are composed of the first seismic belt and the Any one of the combinations of the aforementioned first dampers. The boiler device according to claim 3, wherein each of the aforementioned first dampers and each of the aforementioned second dampers are hydraulic dampers or viscoelastic dampers. The boiler device according to claim 1 or 2, wherein the water wall of the furnace and the cage wall of the cage part are plural An installation mechanism for installing the aforementioned back brackets is provided. Each of the aforementioned installation mechanisms includes: a tie bar held on the water wall, a support mounted on the tie bar, and a support fixed to the support so that the back support can be supported. Auxiliary support block that slides in the horizontal direction. The boiler device according to claim 3, wherein the water wall of the furnace and the cage wall of the cage portion are provided with a plurality of mounting mechanisms for mounting the back brackets, and the mounting mechanisms include: The tie bar of the water wall, the support mounted on the tie bar, and the support fixed to the support to support the back bracket as an auxiliary support block that can slide in the horizontal direction. The boiler device according to claim 4, wherein the water wall of the furnace and the cage wall of the cage portion are provided with a plurality of mounting mechanisms for mounting the back brackets, and the mounting mechanisms include: The tie bar of the water wall, the support mounted on the tie bar, and the support fixed to the support to support the back bracket as an auxiliary support block that can slide in the horizontal direction.

Images