JP7182954B2 - Boiler plant mandore - Google Patents

Description

The present invention relates to a boiler plant mandoor.

At predetermined positions of the boiler and ducts of the boiler plant, there are entrances and exits that are large enough for workers to enter the internal space from the outside for inspection and repair, etc., and are installed from the outside so that the entrances and exits can be opened. A closing mandoor is provided.

Japanese Utility Model Laid-Open No. 4-108146

In the door closed state in which the man door is closed, for example, an elastic sealing member (e.g., rubber packing) is sandwiched between the peripheral edge of the man door (door peripheral edge) and the door mounting portion on the peripheral edge of the entrance/exit, and the door peripheral edge is By tightening a plurality of fastening members (for example, bolts, nuts, etc.) toward the door mounting portion, it is possible to seal the space between the door peripheral portion and the door mounting portion.

However, it is not possible to tighten the bolts at a plurality of locations on the periphery of the door at the same time, and if some of the bolts are tightened too strongly, the mandoor may be distorted and the sealing performance of the elastic sealing member may deteriorate.

Such inconvenience can be avoided by increasing the plate thickness of the mandoor to increase the surface rigidity, but in this case, the increased weight of the mandoor impairs the opening and closing operability.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve sealing performance while suppressing an increase in the weight of a mandoor.

In order to achieve the above object, a first aspect of the present invention is a boiler or duct of a boiler plant provided with an entrance and exit that allows entry into an internal space, and an annular door provided on the periphery of the entrance and exit. A mandoor having an access door structure in which a mandoor for openably closing an entrance/exit is attached to an attachment portion from the outside, the mandoor including a door body, a tightened portion, and a plurality of reinforcing ribs.

The door body has a plate-like shape that integrally has a door peripheral portion over the entire outer periphery of the door main portion. In the door closed state that closes the entrance/exit, the door main portion covers the entrance/exit from the outside, and the door peripheral portion overlaps the door attachment portion from the outside. The tightened portion is fixedly provided on the door body, protrudes from the door peripheral portion, and is tightened by the tightening member toward the door mounting portion in the door closed state. The reinforcing ribs are in the form of plate walls that are fixed to and stand on at least one of the front and back door surfaces of the door body, and linearly extend on the door surface of the door main portion so as to connect different points on the door peripheral edge.

The door peripheral portion sandwiches an elastic seal member for sealing the gap with the door mounting portion between the door mounting portion and the door in the closed state. The plurality of reinforcing ribs includes a first reinforcing rib extending from the vicinity of the portion to be fastened.

In the above configuration, the plurality of reinforcing ribs linearly extending on the door surface of the door main portion so as to connect different parts of the door peripheral edge function as a skeleton of the door body, so that the plate thickness of the door body does not increase. It is possible to increase the surface rigidity of the man door (door body).

Since the plurality of reinforcing ribs include the first reinforcing ribs extending from the vicinity of the tightened portion, the first reinforcing ribs accurately suppress the distortion of the door body when the tightened portion is tightened by the tightening member. can do.

A second aspect of the present invention is the man door of the first aspect, wherein the door body is connected to the door attachment portion so as to be openable and closable by a door hinge interposed between the door peripheral portion and the door attachment portion. The plurality of reinforcing ribs includes a second reinforcing rib extending from the vicinity of the door hinge.

In the above configuration, since the plurality of reinforcing ribs includes the second reinforcing ribs extending from the vicinity of the door hinge, the second reinforcing ribs can appropriately suppress the distortion of the door body caused by the opening and closing operation of the man door.

A third aspect of the present invention is the first or second mandoor, further comprising an annular peripheral wall along the door peripheral edge. The peripheral wall portion is in the form of a plate wall that is fixed to the inner side of the front and back door surfaces facing the interior space when the door is closed. A plurality of erected reinforcing ribs fixed to the inner door surface are fixed to the peripheral wall .

In the above configuration, the door main body is provided with the peripheral wall portion, and the plurality of reinforcing ribs include reinforcing ribs fixed to the peripheral wall portion, so that the peripheral wall portion and the plurality of reinforcing ribs function as a skeleton of the door main body. Therefore, the surface rigidity of the man door (door body) can be further increased.

A fourth aspect of the present invention is the mandoor of the third aspect, wherein the plurality of reinforcing ribs and the peripheral wall are provided on the inner door surface. The peripheral wall portion includes a seal member pressing portion that sandwiches the elastic seal member held on the side of the door mounting portion and the door mounting portion when the door is closed, or a groove forming wall that defines a seal member housing groove for housing the elastic seal member. Department.

In the above configuration, the sealing member pressing portion or the groove forming wall portion functions as a peripheral wall portion without providing a separate peripheral wall portion for exclusive use.

ADVANTAGE OF THE INVENTION According to this invention, sealing property can be improved, suppressing the increase in the weight of a mandoor.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows an example of the boiler plant provided with the mandoor of this invention. 1 is a perspective view showing an open state of a man door according to an embodiment of the present invention together with a door mounting frame; FIG. FIG. 4 is a front view of the closed state of the man door as seen from the outside of the duct; FIG. 4 is a cross-sectional view of essential parts of the man door and the door mounting frame when the door is closed; FIG. 4 is a perspective view showing a state in which the mounted portion of the man door is removed from the bolt of the door mounting frame; FIG. 11 is a cross-sectional view of a main part of a modified example;

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing an example of a boiler plant provided with a mandoor of the present invention. The boiler plant includes a flue gas treatment system that purifies exhaust gas from a boiler (coal-fired boiler) 1 and discharges it into the atmosphere, a primary air system that conveys fuel (coal) with primary air and supplies it to the boiler 1, A secondary air system for supplying combustion air (secondary air) to the boiler 1 is provided. Note that the boiler 1 may be a boiler other than a coal-fired boiler.

A denitration device (SCR) 2, an air preheater (AH: air heater) 3, an electrostatic precipitator (EP) 4, and an induced draft fan (IDF) 5 are provided in the flue gas treatment system. The denitrification device 2 is arranged downstream of the boiler 1 and reduces and removes nitrogen oxides (NOx) in the exhaust gas. The air preheater 3 is arranged downstream of the denitrification device 2 and heats the primary air and the secondary air by heat exchange with the exhaust gas. The electric dust collector 4 is arranged downstream of the air preheater 3 and collects and removes dust (combustion ash) in the exhaust gas. The induced draft fan 5 is arranged downstream of the electrostatic precipitator 4 and induces the exhaust gas to lead to a chimney (not shown).

In the primary air system, primary air is introduced into the mill 7 by a primary aerator (PAF) 6, and the coal pulverized in the mill 7 is transported by the primary air, and together with the primary air is passed through a wind box (WB) 8 to a burner (illustrated). omitted) into the combustion chamber of the boiler 1. A branch system leading to the air preheater 3 is provided in the middle of the primary air system.

In the secondary air system, secondary air (combustion air) introduced into the air preheater 3 by a forced draft fan (FDF) 9 flows (through the wind box 8) from the burner and after air port (AAP) 10 to the boiler 1. supplied to the combustion chamber.

Elements of the flue gas treatment system (including between the boiler 1 and the denitration device 2) are connected by an exhaust duct, and elements of the primary air system and secondary air system (between the boiler 1 and the air preheater 3 are connected). ) are each connected by an air duct. One or more predetermined positions of the exhaust duct and the air duct (hereinafter collectively referred to as duct 20) are provided with an access system that allows workers to enter the duct 20 from the outside during inspection, repair, or the like. A door structure is provided. The access door structure is roughly composed of an opening 22 formed in a peripheral wall (e.g., side wall) 21 of the duct 20, a door mounting frame 30 attached to the opening 22, and a man door 40 attached to the door mounting frame 30 (Fig. 4).

As shown in FIGS. 2 to 5, the door mounting frame 30 is in close contact with a flat door mounting portion 32 having a partition wall fixing hole 31 (see FIG. 4) formed therein and the inner peripheral edge of the partition wall fixing hole 31. It has an entrance/exit partition wall 33 that is fixed and substantially perpendicular to the door attachment portion 32 , and a man door 40 is attached to the door attachment portion 32 . The partition wall fixing hole 31 has an oval shape, and the entrance/exit partition wall 33 has an oblong cylindrical shape. The entrance/exit partition wall 33 protrudes from both the front and back surfaces of the door mounting portion 32 so that the amount of protrusion to the other side (the inside of the duct) is larger than that of one side (the outside of the duct). By inserting the duct inner portion of the inlet/outlet partition wall 33 into the opening 22 of the duct 20 and fixing the outer peripheral surface of the inlet/outlet partition wall 33 and the inner peripheral surface of the opening 22 in a sealed state, the door mounting frame 30 is attached to the duct. 20 (see FIG. 4). In a state where the door mounting frame 30 is fixed to the duct 20 , the inlet/outlet partition wall 33 partitions the inlet/outlet 24 with a size that allows an operator to enter the internal space 23 of the duct 20 .

Thus, in the access door structure of the present embodiment, the duct 20 is provided with the inlet/outlet 24 that allows entry into the internal space 23, and the annular door attachment portion 32 provided on the periphery of the inlet/outlet 24 , a mandoor 40 is mounted from the outside of the duct 20 for releasably closing the inlet/outlet 24 .

An outer peripheral wall 35 is fixed to the outer surface of the door attachment portion 32 so as to surround the duct outer portion (inner peripheral wall 34 ) of the entrance/exit partition wall 33 . A sealing member accommodating groove 39 is formed by the above. The seal member accommodation groove 39 is annular over the entire outer peripheral edge of the inlet/outlet 24 , and an elastic seal member (for example, rubber packing) 25 is accommodated and fixed in the seal member accommodation groove 39 .

The man door 40 includes a door body 41 , a plurality of clamped portions (stopper portions) 42 , and a plurality of reinforcing ribs 43 .

The door main body 41 is an oval plate having a door peripheral edge portion 45 integrally with the door main portion 44 over the entire outer periphery thereof. In the door closed state in which the entrance/exit 24 is closed, the door main portion 44 covers the entrance/exit 24 from the outside, and the door peripheral portion 45 overlaps the door mounting portion 32 from the outside. The door body 41 is connected to the door mounting portion 32 so as to be openable and closable by two door hinges 26 interposed between the door peripheral portion 45 and the door mounting portion 32 . Of the front and back door surfaces 46 and 47 of the door body 41, one is the outer door surface 46 exposed to the outside when the door is closed, and the other is facing the inlet/outlet 24 side (internal space 23 side) when the door is closed. It is the inner door surface 47 .

The fastened portions 42 of this embodiment are arranged at two locations on the upper side, two locations on the lower side, and two locations in the middle, and are fixed to the door surface 46 on the outside of the door body 41. It protrudes from the door peripheral portion 45 . The intermediate attached portions 42 face each other across the door main portion 44 , and one of the intermediate attached portions 42 is arranged between the two door hinges 26 . A bolt insertion groove 48 that opens at the projecting tip end edge is formed in the tightened portion 42 .

Six tightening members 36 are arranged on the outer surface of the door mounting portion 32 of the door mounting frame 30 so as to correspond to the six mounting portions 42 . The tightening member 36 has a bolt (I bolt) 37 that is rotatably supported with respect to the door mounting portion 32 and a nut 38 that screws onto the bolt 37 . The bolt 37 can tilt between an upright position substantially perpendicular to the outer surface of the door mounting portion 32 and a collapsed position in which the bolt 37 falls outward from the upright position toward the outside of the entrance/exit 24 .

A sealing member pressing portion (peripheral wall portion) 50 is fixed to the inner door surface 47 of the door peripheral portion 45 of the door body 41 . The seal member pressing portion 50 is an annular plate wall that stands substantially vertically from the inner door surface 47 along the door peripheral portion 45 . The elastic seal member 25 held in the seal member accommodating groove 39 of the door attachment portion 32 is sandwiched between the seal member pressing portion 50 and the door attachment portion 32 in the door closed state. The elastic sealing member 25 seals between the door peripheral portion 45 and the door mounting portion 32 .

In the closed state of the door, when the bolt 37 in the lowered position is tilted to the upright position, the bolt 37 advances into the bolt insertion groove 48 of the tightened portion 42 and is inserted through the bolt insertion groove 48 . When the nut 38 is tightened in such a state, the door peripheral portion 45 is pressed toward the entrance/exit 24 side, and the entrance/exit 24 is sealed by the mandoor 40 .

The attached portion 42 is reinforced by a pair of reinforcing plates 49 . A pair of reinforcing plates 49 are arranged on both sides of the bolt insertion groove 48 and fixed to the attached portion 42 and the sealing member pressing portion 50 .

Each of the plurality of reinforcing ribs 43 is in the form of a plate wall that is fixed to a door surface 47 inside the door main body 41 and stands upright, and extends on the door surface 47 of the door main portion 44 so as to connect different parts of the door peripheral portion 45 . extend in a straight line. The plurality of reinforcing ribs 43 include a first reinforcing rib 43A extending from the vicinity of the fastened portion 42 and a second reinforcing rib 43B extending from the vicinity of the door hinge 26. As shown in FIG.

The first reinforcing ribs 43A extending from the vicinity of the two middle mounted portions 42 extend linearly so as to connect the two middle mounted portions 42 . The second reinforcing rib 43B extends linearly from the vicinity of the door hinge 26 and reaches the door peripheral edge portion 45 facing the door hinge 26 with the door main portion 44 interposed therebetween. The tips of the first reinforcing ribs 43A extending from the vicinity of the two upper mounting portions 42 are fixed to the intermediate portions of the upper second reinforcing ribs 43B, and extend from the vicinity of the two lower mounting portions 42. The tip of the first reinforcing rib 43A is fixed to the intermediate portion of the lower second reinforcing rib 43B.

A portion of the door peripheral portion 45 to which the attached portion 42 is fixed is reinforced by a reinforcing plate 51 . The reinforcing plate 51 has an L-shaped cross section and is superimposed and fixed on the inner door surface 47 and the inner peripheral surface of the sealing member pressing portion 50 .

The end portion of each reinforcing rib 43 on the side of the door peripheral portion 45 is fixed to the sealing member pressing portion 50 . In this embodiment, the reinforcement plate 51 is fixed to the portion overlapping the seal member pressing portion 50 .

The reinforcing rib 43 and the sealing member pressing portion 50 project from the door surface 47 so that the reinforcing rib 43 is higher than the sealing member pressing portion 50 . However, in order to avoid interference with the door mounting frame 30, the end portion of the reinforcing plate portion 43 on the side of the door peripheral edge portion 45 is formed to have a low protrusion height.

According to this embodiment, the plurality of reinforcing ribs 43 linearly extending on the door surface 47 of the door main portion 44 so as to connect different parts of the door peripheral edge portion 45 function as a skeleton of the door body 41, so that the door body The surface rigidity of the man door 40 (door body 41) can be increased without increasing the plate thickness of the man door 41.

Since the plurality of reinforcing ribs 43 include the first reinforcing ribs 43A extending from the vicinity of the tightened portion 42, the occurrence of distortion of the door body 41 when the tightened portion 42 is tightened by the tightening member 36 is firstly prevented. It can be suppressed precisely by the reinforcing rib 43A.

Since the plurality of reinforcing ribs 43 include the second reinforcing ribs 43B extending from the vicinity of the door hinge 26, the second reinforcing ribs 43B can appropriately suppress the distortion of the door body 41 caused by the opening/closing operation of the man door 40. .

A sealing member pressing portion (peripheral wall portion) 50 is provided on the door body 41, and each reinforcing rib 43 is fixed to the sealing member pressing portion 50, so that the sealing member pressing portion 50 and the plurality of reinforcing ribs 43 are connected to each other. It functions as a frame of the door body 41 . Therefore, the surface rigidity of the man door 40 (door body 41) can be further increased.

Since the seal member pressing portion 50 functions as a peripheral wall portion without providing a separate peripheral wall portion for exclusive use, it is possible to suppress complication of the structure and an increase in weight.

In addition, the present invention is not limited to the above-described embodiments and modifications described as examples, and other than the above-described embodiments, etc., as long as they do not deviate from the technical idea of the present invention. , various modifications are possible according to the design and the like.

For example, in the above-described embodiment, the seal member accommodation groove 39 is provided in the door mounting portion 32 and the seal member pressing portion 50 is provided in the door main body 41. However, as shown in FIG. , and the seal member pressing portion 50 may be provided in the door mounting portion 32 . In this case, the inner peripheral wall 34 and the outer peripheral wall 35 defining the sealing member accommodating groove 39 may be fixed to the inner door surface 47 , the inner peripheral wall 34 may function as a peripheral wall portion, and the reinforcing ribs 43 may be fixed to the inner peripheral wall 34 . .

Also, the inlet/outlet 24 and the mandoor 40 may be provided in the boiler 1 instead of or in addition to the duct 20 . Reinforcing ribs 43 may be provided on the outer door surface 46 instead of or in addition to the inner door surface 47 of the man door 40 . Instead of the bolt insertion groove 48, a bolt insertion hole may be formed in the tightened portion 42, and the mandoor 40 may be tightened by a bolt (a general bolt, not an I bolt) inserted through the bolt insertion hole. The man door 40 may be detachably attached to the door mounting portion 32 with a bolt instead of being connected to the door mounting portion 32 via the door hinge 26 so that the man door 40 can be opened and closed. The shape of the door body 41 is not limited to an oval shape, and may be other shapes such as a circle or a rectangle.

1: Boiler 2: Denitration device (SCR)
3: Air preheater (AH)
4: Electric dust collector (EP)
5: Induced draft fan (IDF)
6: Primary fan (PAF)
7: mill 8: wind box (WB)
9: Forced draft fan (FDF)
10: After Airport (AAP)
20: Duct 21: Peripheral wall 22: Opening 23: Internal space 24: Entrance/exit 25: Elastic seal member 26: Door hinge 30: Door mounting frame 31: Partition wall fixing hole 32: Door mounting part 33: Entrance/exit partition wall 34: Inside Peripheral wall 35: Peripheral wall 36: Fastening member 37: Bolt 38: Nut 39: Seal member accommodating groove 40: Mandoor 41: Door body 42: Fastened portions 43, 43A, 43B: Reinforcement rib 44: Door main portion 45: Door peripheral portion 46: outer door surface 47: inner door surface 48: bolt insertion grooves 49, 51: reinforcing plate 50: sealing member pressing portion (peripheral wall portion)

Claims (4)

A boiler or a duct of a boiler plant is provided with an inlet/outlet that allows access to an internal space, and an annular door mounting portion provided on the periphery of the inlet/outlet is provided with a man door that opens and closes the inlet/outlet. The mandoor of an access door construction mounted from the outside, comprising:
The door main portion has a plate-like shape integrally having a door peripheral portion over the entire outer periphery thereof, and in a door closed state in which the door is closed, the door main portion covers the door from the outside, and the door peripheral portion covers the door from the outside. a door body that overlaps the door mounting portion from the outside;
a plurality of tightened portions that are fixedly provided on the door body, protrude from the door peripheral portion, and are tightened by a tightening member toward the door mounting portion in the door closed state;
A plurality of reinforcements, each of which has a plate wall shape that is fixed to at least one of the front and back door surfaces of the door body and stands upright, and linearly extends on the door surface of the door main portion so as to connect different parts of the door peripheral edge portion. comprising ribs and
The door peripheral portion sandwiches an elastic seal member for sealing between the door mounting portion and the door mounting portion in the door closed state,
A mandoor for a boiler plant, wherein the plurality of reinforcing ribs includes a first reinforcing rib extending from the vicinity of the tightened portion. The mandoor according to claim 1,
The door body is connected to the door mounting portion so as to be openable and closable by a door hinge interposed between the door peripheral portion and the door mounting portion,
The boiler plant mandoor, wherein the plurality of reinforcing ribs includes a second reinforcing rib extending from the vicinity of the door hinge. The mandoor according to claim 1 or claim 2,
An annular peripheral wall portion that is fixed to and stands up on an inner door surface facing the internal space in the closed state of the front and back door surfaces, and an annular peripheral wall portion along the door peripheral portion,
The plurality of reinforcing ribs fixed and erected on the inner door surface are fixed to the peripheral wall portion.
A boiler plant mandoor characterized by: The mandoor according to claim 3,
The plurality of reinforcing ribs and the peripheral wall portion are provided on the inner door surface,
The peripheral wall portion includes a seal member pressing portion that holds the elastic seal member held on the side of the door mounting portion between itself and the door mounting portion in the closed state of the door, or a seal member receiving groove that receives the elastic seal member. A mandoor for a boiler plant, characterized in that it is a groove-forming wall portion that partitions the

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