CN212299041U

CN212299041U - Boiler smoke duct

Info

Publication number: CN212299041U
Application number: CN202020347639.8U
Authority: CN
Inventors: 赵凤祥; 王正峰; 王泽辉; 张林英
Original assignee: Guangdong Datang International Leizhou Power Generation Co Ltd
Current assignee: Guangdong Datang International Leizhou Power Generation Co Ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2021-01-05
Anticipated expiration: 2030-03-18

Abstract

The utility model discloses a boiler flue, including the straight tube, straight tube one end switch-on connection has the return bend, straight tube one side is installed the connector No. one, No. two connectors are installed to return bend one side, the inside welding of straight tube has the bracing piece No. one, bracing piece both ends are all fixedly connected with the reinforcing plate, the straight tube outer wall is equipped with channel-section steel reinforcing rib No. one, the inside fixedly connected with bracing piece No. two of return bend, return bend outer wall fixedly connected with channel-section steel reinforcing rib No. two, the straight tube and return bend outside all install heat preservation mechanism, the utility model discloses under the condition that has the same sectional area and the flue gas velocity of flow is the same, more flue gas can flow through in the interior support of wing section or rhombus cross section to energy; in addition, the central line of the airfoil or diamond-shaped cross section is longer, so that the strength of the inner support in the length direction is enhanced, and the service life of the inner support is prolonged.

Description

Boiler smoke duct

Technical Field

The utility model relates to a thermal power generation technical field specifically is boiler flue gas wind channel.

Background

Thermal power generation is divided into pure power supply and power generation and heat supply according to the function of the thermal power generation. The power generation of a steam turbine, the power generation of a gas turbine and the power generation of a diesel engine are divided according to a prime motor. According to the fuel, the fuel mainly comprises coal power generation, fuel oil power generation and gas power generation. In order to improve the comprehensive economic benefit, the thermal power generation should be carried out as close to the fuel base as possible. Combined heat and power should be implemented in large cities and industrial areas.

In order to improve the efficiency of a thermal power plant, a generator set is developed in a high-parameter, large-capacity and various combined cycles manner, and the high efficiency and the energy conservation of the thermal generator set are realized by continuously optimizing the design of each system and optimizing the configuration of the system. The boiler auxiliary machine mainly comprises a coal mill, a blower, a primary fan, an induced draft fan and the like, the consumed electric energy of the boiler auxiliary machine accounts for more than half of the plant power consumption rate, the reduction of the power consumption of the three fans has very important effects on energy conservation and emission reduction of a thermal power plant, and the resistance of a smoke air duct is the main part of the power consumption of the fans.

However, the existing boiler flue mainly has the following disadvantages:

1. when the size of the flue duct is larger than a certain value, reinforcing ribs need to be arranged on the outer wall of the flue duct, in the actual construction process, in order to ensure the construction safety and reduce the use of the reinforcing ribs, or when the frequency control limit span is exceeded and the reinforcing rib specification needs to be reduced, the inner support is additionally arranged in the flue duct and is a necessary measure. The disadvantages of this internal support are: after the size of the smoke air duct is increased, the number of the inner supports is correspondingly increased, the resistance in the smoke air duct can be increased by the plurality of inner supports, and the existing inner supports of the circular tubes or the section steel enable smoke flow to easily generate vortex flow, increase the vibration of the smoke air duct and consume energy, so that the energy-saving effect cannot be realized, and the service life of the inner supports is short;

2. the existing boiler flue has poor heat insulation effect, which leads to lower heat utilization efficiency.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a boiler flue gas duct, with solve among the above-mentioned background art present when flue gas duct size is greater than a definite value after, need set up the reinforcement rib on the flue outer wall in flue gas duct, in the actual work progress, use with the reduction reinforcement rib for construction safety, perhaps when exceeding frequency control limit span and need reduce the reinforcement rib specification, it is necessary measure to add interior support in flue gas duct, in prior art, interior support adopts the pipe more, set up the several reinforcing plate on flue gas duct inner wall at first when setting up interior support, transversely set up an interior support on the reinforcing plate of each relative setting of group, support at this moment and aim at every and transversely consolidate the rib setting. The disadvantages of this internal support are: after the size of the smoke air duct is increased, the number of the inner supports is correspondingly increased, the resistance in the smoke air duct can be increased by the plurality of inner supports, and the existing inner supports of the circular tubes or the section steel enable smoke flow to easily generate vortex flow, increase the vibration of the smoke air duct and consume energy, so that the energy-saving effect cannot be realized, and the service life of the inner supports is short; the existing boiler flue has poor heat preservation effect, which causes the problem of low heat energy utilization efficiency.

In order to achieve the above object, the utility model provides a following technical scheme: boiler cigarette wind channel, including the straight tube, straight tube one end turn-on connection has the return bend, the connector is installed No. one to straight tube one side, No. two connectors are installed to return bend one side, straight tube inside weld has the bracing piece No. one, the equal fixedly connected with reinforcing plate in bracing piece both ends, the straight tube outer wall is equipped with channel-section steel reinforcing rib No. one, the bracing piece No. two of the inside fixedly connected with of return bend, No. two channel-section steels reinforcing rib of return bend outer wall fixedly connected with, heat preservation mechanism is all installed to straight tube and return bend outside.

Preferably, the first connector and the second connector are both three-dimensional connectors, and the resistance of wind flowing can be reduced.

Preferably, a bracing piece cross-section is the wing section, and the resistance that the interior support of wing section cross-section can significantly reduce the flue gas wind flow, the reinforcing plate links to each other with the straight tube inner wall welding, can increase the area of contact of a bracing piece and straight tube to make a bracing piece firm in the straight tube.

Preferably, the setting position of a bracing piece stiff end is corresponding with the setting position of a channel-section steel reinforcing rib, can improve the structural strength of a bracing piece.

Preferably, the center line of the airfoil-shaped cross section of the second support rod is an arc-shaped line, so that the resistance to flow of smoke and wind is further reduced, and the energy consumption is reduced.

Preferably, the heat preservation mechanism includes rock wool layer and polystyrene foam layer, and is connected through the compound mode between rock wool layer and the polystyrene foam layer, is favorable to the heat preservation in wind channel.

The utility model provides a boiler cigarette wind channel possesses following beneficial effect:

(1) the utility model uses the inner support with wing section or diamond cross section, which can greatly reduce the resistance of the smoke and wind flow, because the smoke and wind can not generate vortex after flowing through the inner support, the vibration of the smoke and wind channel is reduced, and the noise is reduced; compared with the existing internal support made of round tubes or section steel, the internal support with the wing-shaped or diamond-shaped cross section can flow more smoke and wind under the conditions of the same cross section area and the same smoke and wind flow velocity, so that the energy consumption is reduced; in addition, the central line of the airfoil or diamond-shaped cross section is longer, so that the strength of the inner support in the length direction is enhanced, and the service life of the inner support is prolonged.

(2) The utility model discloses a be connected through compound mode between rock wool layer and the polystyrene foam layer, laminate mutually through the outer wall in polystyrene foam layer and wind channel simultaneously, have fine heat preservation thermal-insulated effect, prevent the inside thermal scattering and disappearing in wind channel, can collect the utilization to heat energy, improved the efficiency that heat energy utilized.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the straight pipe of the present invention;

fig. 3 is a schematic view of the internal structure of the elbow pipe of the present invention;

fig. 4 is a schematic diagram of the straight pipe section structure of the present invention.

In the figure: 1. a straight pipe; 2. bending the pipe; 3. a first connector; 301. a second connector; 4. a first support rod; 5. a reinforcing plate; 6. a first channel steel reinforcing rib; 7. a second support rod; 8. a second channel steel reinforcing rib; 9. a heat preservation mechanism; 901. a rock wool layer; 902. a polystyrene foam layer.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1-4, the utility model provides a technical solution: boiler cigarette wind channel, including straight tube 1, 1 one end turn-on connection of straight tube has return bend 2, connector 3 is installed to 1 one side of straight tube, No. 2 connectors 301 are installed to return bend one side, 1 internal weld of straight tube has bracing piece 4 No. one, the equal fixedly connected with reinforcing plate 5 in 4 both ends of bracing piece, 1 outer wall of straight tube is equipped with channel-section steel reinforcing rib 6 No. one, 2 inside fixedly connected with bracing pieces 7 of return bend, 2 outer wall fixedly connected with channel-section steel reinforcing rib 8 No. two of return bend, heat preservation mechanism 9 is all installed to straight tube 1 and 2 outsides of return bend.

The section of the first support rod 4 is wing-shaped, two ends of the first support rod are connected with the inner wall of the straight pipe 1 by being fixed on a pair of reinforcing plates 5, the outer side wall of the straight pipe 1 is transversely provided with a first channel steel reinforcing rib 6, the first channel steel reinforcing rib is distributed along the outer side wall of the straight pipe 1 in a ring shape, the opening direction of the first channel steel reinforcing rib is the same as the flow direction of smoke wind, the first support rod 4 and the reinforcing plates 5 are fixed in a welding mode, so that the first support rod 4 is firmly fixed in the straight pipe 1, the arc-shaped end surface in the straight section part faces the flow direction of the smoke wind, the setting position of the fixed end of the first support rod 4 corresponds to the setting position of the first channel steel reinforcing rib 6, the cross section of the first support rod 4 is in an axial symmetry structure, the central line of the cross section is a straight line, the central line is parallel to the side wall surface of the straight, therefore, the vibration of the smoke air duct is reduced, and the noise is reduced; in addition, under the conditions that the cross section is the same and the flow velocity of the smoke and the wind is the same, the internal support of the airfoil cross section can greatly reduce the flow resistance of the smoke and the wind, and compared with the existing internal support which takes a round pipe or profile steel as the internal support, more smoke and the wind can flow, so that the energy consumption is reduced; the central line of airfoil cross section is longer, has strengthened the intensity of interior support on this length direction, has prolonged the life of interior support, under the same condition, also can reduce the quantity of interior support relatively, practices thrift implementation cost, and 2 sections airfoil section internal stay bars of return bend and straight tube 1 part's difference lies in: support rod 7 is located the bending segment in cigarette wind channel, the central line of No. two support rod 7's airfoil cross section is an arc molded lines, the central line is roughly the same with the cigarette wind flow path that flows through the bending segment, according to the particular case that the cigarette wind flows in the bending segment, the interior support that this position adopted, its central line also is corresponding pitch arc, be favorable to further reducing the resistance that the cigarette wind flows, reduce the power consumption, be connected through compound mode between rock wool layer 901 and the polystyrene foam layer 902, laminate mutually through the outer wall in polystyrene foam layer 902 and wind channel simultaneously, have fine heat preservation thermal-insulated effect, prevent the inside thermal scattering and disappearing in wind channel, can collect the utilization to heat energy, the efficiency of heat utilization has been improved.

The first connector 3 and the second connector 301 are both three-dimensional connectors, and can reduce the resistance of wind flow.

The section of the first supporting rod 4 is of an airfoil shape, the inner support of the airfoil-shaped cross section can greatly reduce the flowing resistance of smoke and wind, the reinforcing plate 5 is connected with the inner wall of the straight pipe 1 in a welding mode, the contact area of the first supporting rod 4 and the straight pipe 1 can be increased, and therefore the first supporting rod 4 can be made to be stable in the straight pipe 1.

The setting position of 4 stiff ends of a bracing piece is corresponding with the setting position of a channel-section steel reinforcement rib 6, can improve the structural strength of bracing piece 4.

The central line of the airfoil-shaped cross section of the second support rod 7 is an arc-shaped line, so that the resistance of smoke and wind flowing is further reduced, and the energy consumption is reduced.

The heat insulation mechanism 9 comprises a rock wool layer 901 and a polystyrene foam layer 902, and the rock wool layer 901 and the polystyrene foam layer 902 are connected in a composite mode, so that heat insulation of the air duct is facilitated.

It should be noted that, during operation, one end of the straight pipe 1 is conductively connected with the bent pipe 2, one side of the straight pipe 1 is provided with the first connector 3, one side of the bent pipe 2 is provided with the second connector 301, the straight pipe 1 is internally welded with the first support rod 4, two ends of the first support rod 4 are fixedly connected with the reinforcing plates 5, the outer wall of the straight pipe 1 is provided with the first channel steel reinforcing rib 6, the inner part of the bent pipe 2 is fixedly connected with the second support rod 7, the outer wall of the bent pipe 2 is fixedly connected with the second channel steel reinforcing rib 8, the outer parts of the straight pipe 1 and the bent pipe 2 are respectively provided with the heat preservation mechanism 9, the cross section of the first support rod 4 is in a wing shape, two ends of the first support rod are connected with the inner wall of the straight pipe 1 by being fixed on the pair of reinforcing plates 5, the outer side wall of the, the opening direction of the support rod is the same as the flow direction of smoke wind, the first support rod 4 is connected with the reinforcing plate 5 in a welding mode, the first support rod 4 is firmly fixed in the straight pipe 1, the inner support arc-shaped end surface of the straight section part faces the flow direction of the smoke wind, the setting position of the fixed end of the first support rod 4 corresponds to the setting position of the first steel groove reinforcing rib 6, the cross section of the first support rod 4 is in an axisymmetric structure, the central line of the cross section is a straight line and is parallel to the side wall surface of the straight pipe 1, namely, the central line is approximately parallel to the flow track of the smoke wind when the smoke wind moves straightly, and no vortex is generated after the smoke wind flows through the first support rod 4, so that the vibration of a smoke wind channel is; in addition, under the conditions that the cross section is the same and the flow velocity of the smoke and the wind is the same, the internal support of the airfoil cross section can greatly reduce the flow resistance of the smoke and the wind, and compared with the existing internal support which takes a round pipe or profile steel as the internal support, more smoke and the wind can flow, so that the energy consumption is reduced; the central line of airfoil cross section is longer, has strengthened the intensity of interior support on this length direction, has prolonged the life of interior support, under the same condition, also can reduce the quantity of interior support relatively, practices thrift implementation cost, and 2 sections airfoil section internal stay bars of return bend and straight tube 1 part's difference lies in: the second support rod 7 is positioned at the bending section of the smoke air duct, the central line of the airfoil-shaped cross section of the second support rod 7 is an arc-shaped line, the central line is approximately the same as the flow track of smoke air flowing through the bending section, according to the specific situation of the smoke air flowing in the bending section, the inner support is adopted at the position, the central line is also a corresponding arc line, the resistance to the flow of the smoke air is further reduced, the energy consumption is reduced, the rock wool layer 901 and the polystyrene foam layer 902 are connected in a composite mode, meanwhile, the polystyrene foam layer 902 is attached to the outer wall of the air duct, the heat insulation effect is good, the heat dissipation in the air duct is prevented, the heat energy can be collected and utilized, the heat energy utilization efficiency is improved, the first connector 3 and the second connector 301 are both three-dimensional connectors, the resistance to the flow of the air can be reduced, the section of the, the interior support of airfoil cross section can significantly reduce the resistance that the cigarette wind flows, reinforcing plate 5 links to each other with 1 inner wall welding of straight tube, can increase the area of contact of a bracing piece 4 and straight tube 1 to make a bracing piece 4 firm in straight tube 1, the position that sets up of a bracing piece 4 stiff end is corresponding with the position that sets up of a channel-section steel reinforcing rib 6, can improve the structural strength of a bracing piece 4, the central line of the airfoil cross section of No. two bracing pieces 7 is an arc molded lines, is favorable to further reducing the resistance that the cigarette wind flows, reduces the power consumption, heat preservation mechanism 9 includes rock wool layer 901 and polystyrene foam layer 902, and is connected through compound mode between rock wool layer 901 and the polystyrene foam layer 902, is favorable to the heat preservation in wind channel.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Boiler flue gas duct, its characterized in that: including straight tube (1), straight tube (1) one end turn-on connection has return bend (2), connector (3) are installed to straight tube (1) one side, No. two connector (301) are installed to return bend (2) one side, straight tube (1) internal weld has bracing piece (4) No. one, the equal fixedly connected with reinforcing plate (5) in bracing piece (4) both ends, straight tube (1) outer wall is equipped with channel-section steel reinforcement rib (6) No. one, bracing piece (7) No. two of return bend (2) inside fixedly connected with, No. two channel-section steels reinforcement rib (8) of return bend (2) outer wall fixedly connected with, heat preservation mechanism (9) are all installed to straight tube (1) and return bend (2) outside.

2. The boiler flue gas duct of claim 1, wherein: the first connector (3) and the second connector (301) are both three-dimensional connectors.

3. The boiler flue gas duct of claim 1, wherein: the section of the first supporting rod (4) is in an airfoil shape, and the reinforcing plate (5) is connected with the inner wall of the straight pipe (1) in a welding mode.

4. The boiler flue gas duct of claim 1, wherein: the setting position of a bracing piece (4) stiff end corresponds with the setting position of a channel-section steel reinforcement rib (6).

5. The boiler flue gas duct of claim 1, wherein: the center line of the airfoil-shaped cross section of the second support rod (7) is an arc-shaped line.

6. The boiler flue gas duct of claim 1, wherein: the heat preservation mechanism (9) comprises a rock wool layer (901) and a polystyrene foam layer (902), and the rock wool layer (901) and the polystyrene foam layer (902) are connected in a composite mode.