阅读说明：本技术 一种回转式空预器扇形板自适应的恒间隙密封系统 (Self-adaptive constant-clearance sealing system for sector plates of rotary air preheater ) 是由 李杨 井新经 周元祥 王宏武 张奔 林琳 王勇 王浩 于 2020-07-06 设计创作，主要内容包括：本发明公开了一种回转式空预器扇形板自适应的恒间隙密封系统,包括扇形板盖及简支扇形板,简支扇形板的一侧嵌于所述扇形板盖内,简支扇形板的圆心角端通过铰接轴铰接于空预器中心筒上,空预器转子框架顶部的外沿处设置有耐高温滑轮结构,高温滑轮结构支撑简支扇形板的弧边端,该系统能够实现扇形板和密封片密封,同时可靠性较高。(The invention discloses a self-adaptive constant-clearance sealing system for sector plates of a rotary air preheater, which comprises a sector plate cover and a simply supported sector plate, wherein one side of the simply supported sector plate is embedded in the sector plate cover, the circle center angle end of the simply supported sector plate is hinged to a central cylinder of the air preheater through a hinge shaft, a high-temperature resistant pulley structure is arranged at the outer edge of the top of a rotor frame of the air preheater, and supports the arc edge end of the simply supported sector plate.)

1. The utility model provides a rotation air preheater sector plate self-adaptation's permanent clearance sealing system which characterized in that, the sector plate includes sector plate lid (2) and simply supports sector plate (9), inlay in one side of simply supporting sector plate (9) in sector plate lid (2), the centre of a circle angle end of simply supporting sector plate (9) articulates on air preheater center section of thick bamboo (1) through articulated shaft (8), and the outer edge department at air preheater rotor frame (6) top is provided with high temperature resistant pulley structure (7), and high temperature pulley structure (7) support the arc limit end of simply supporting sector plate (9).

2. The self-adaptive constant-clearance sealing system for the sector plates of the rotary air preheater according to claim 1, wherein the high-temperature resistant pulley structure (7) is as high as the sealing plate (4) in the air preheater.

3. The self-adaptive constant-gap sealing system for the sector plates of the rotary air preheater according to claim 1, wherein when the simple-supported sector plate (9) automatically rotates up and down during operation, the arc edge end of the simple-supported sector plate (9) is always partially embedded into the sector plate cover (2), so that the sector plate cover (2) and the simple-supported sector plate (9) are always kept in an embedded state;

when the rotor of the air preheater deforms and the outer edge of the rotor of the air preheater sinks, the high-temperature-resistant pulley structure (7) fixed on the outer edge of the rotor frame (6) of the air preheater sinks along with the rotor, the arc edge end of the simply-supported fan-shaped plate (9) sinks along with the rotor frame, and the constant gap between the simply-supported fan-shaped plate (9) and the sealing sheet (4) is ensured.

Technical Field

The invention belongs to the field of energy conservation and environmental protection, and relates to a self-adaptive constant-gap sealing system for a sector plate of a rotary air preheater.

Background

Currently, air preheater seals are primarily focused on the type and configuration of the sealing sheets, including a) stationary seals; b) fixed double sealing; c) fixed type three sealing; d) sealing by spring plate; e) hinge spring type sealing; f) elastic self-adaptive sealing; g) brush seal technology; h) hinge type sealing; i) magnetic suspension type sealing; j) and controlling the clearance self-compensation air leakage. Such a sealing structure portion of the gasket type has the following problems: because the clearance between the sector plates and the sealing sheets changes along with the load, the air leakage rate of the air preheater can not be maintained at the level of rated load under the partial load of the boiler; the same reason also easily causes the failure and deformation of a partial contact type sealing structure, and leads to the failure of the whole sealing structure; the sealing sheet with a more complex structure is under the conditions of repeated stress and high temperature resistance for a long time, the reliability is lower, and the failure of the sealing structure is more common.

Secondly, the sealing technology of the air preheater by adjusting the sector plate mainly comprises the following steps: k) an air leakage control system. The working principle of the sealing is that a sensor is used for automatically monitoring the deformation state of a rotor at regular time, and after information of the sensor is transmitted to an actuating mechanism, the actuating mechanism acts and adjusts a sector plate according to feedback information, so that the gap reaches the optimal state, and the air leakage rate is reduced. In actual operation, the defects of gap measurement error, large system maintenance workload, easy failure of a tracking device and the like exist.

And finally, l) dredging sealing. The air leaked to the flue gas side is adopted for dredging or recycling and is sent into a hearth for reuse, so that the aim of reducing air leakage is fulfilled; m) pressure sealing technique. The pressurizing and sealing technology is characterized in that a channel is formed in a sector plate, and flue gas at the outlet of the air preheater is pressurized by a high-pressure fan and then is sent into a sealing area, so that the pressure difference between the flue gas and the air side is reduced, and the air leakage rate of the air preheater is reduced. The two seals increase the power consumption of the fan and do not fundamentally solve the problem of air leakage.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a self-adaptive constant-clearance sealing system for a sector plate of a rotary air preheater, which can realize the sealing of the sector plate and a sealing plate and has higher reliability.

In order to achieve the purpose, the self-adaptive constant-gap sealing system for the sector plates of the rotary air preheater provided by the invention comprises the sector plate cover and a simply-supported sector plate, wherein one side of the simply-supported sector plate is embedded in the sector plate cover, the circle center angle end of the simply-supported sector plate is hinged to a central cylinder of the air preheater through a hinged shaft, a high-temperature-resistant pulley structure is arranged at the outer edge of the top of a rotor frame of the air preheater, and the arc edge end of the simply-supported sector plate is connected with the high-temperature-resistant pulley structure.

The high temperature resistant pulley structure is as high as the sealing sheet in the air preheater.

When the simply-supported sector plate automatically rotates up and down during working, the arc edge end on the simply-supported sector plate is always partially embedded into the sector plate cover, so that the sector plate cover and the simply-supported sector plate are always kept in an embedded state.

When the rotor of the air preheater deforms and the outer edge of the rotor of the air preheater sinks, the high-temperature-resistant pulley structure fixed on the outer edge of the rotor frame of the air preheater sinks along with the rotor, the arc edge end of the simply-supported fan-shaped plate sinks along with the rotor frame of the air preheater, and the constant gap between the simply-supported fan-shaped plate and the sealing plate is ensured.

The invention has the following beneficial effects:

the self-adaptive constant clearance sealing system of the sector plate of the rotary air preheater of the invention is characterized in that one side of the simply supported sector plate is embedded in the sector plate cover when the simply supported sector plate automatically rotates up and down, the sector plate cover and the simply supported sector plate are always kept in an embedded state, a penetrating gap is not formed between the sector plate cover and the simply supported sector plate, the circle center angle end of the simply supported sector plate is hinged on a central cylinder of the air preheater through a hinge shaft, the outer edge of a rotor frame of the air preheater is provided with a high temperature resistant pulley structure, the arc edge end of the simply supported sector plate is connected with the high temperature resistant pulley structure, when the rotor of the air preheater deforms and the outer edge of the rotor of the air preheater sinks, the high temperature resistant pulley structure fixed on the outer edge of the rotor frame of the air preheater sinks along with the arc edge end of the simply supported sector plate, and the clearance between the simply supported sector plate and the sealing plate is ensured to be constant, the reliability is high.

Furthermore, the high-temperature resistant pulley structure is as high as the sealing piece, and the distance between the sealing piece and the sector plate is ensured to be minimum.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is a schematic structural diagram of the sector plate cover 2 and the simply supported sector plate 9 of the present invention;

FIG. 4 is a schematic view of a simple support sector plate 9 and a refractory pulley structure 7 according to the present invention;

fig. 5 is a number diagram of the refractory sheave structures 7 according to the present invention.

Wherein: the heat storage device comprises a central cylinder 1 of the air preheater, a fan-shaped plate cover 2, an air preheater shell 3, a sealing sheet 4, a heat storage element 5, an air preheater rotor frame 6, a high-temperature-resistant pulley structure 7, a hinge shaft 8 and a simply-supported fan-shaped plate 9.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1 to 5, the sector plate of the self-adaptive constant clearance sealing system of the sector plate of the rotary air preheater comprises a sector plate cover 2 and a simply supported sector plate 9, one side of the simply supported sector plate 9 is embedded in the sector plate cover 2, the circle center angle end of the simply supported sector plate 9 is hinged to a central cylinder 1 of the air preheater through a hinge shaft 8, a high temperature resistant pulley structure 7 is arranged at the outer edge of the top of a rotor frame 6 of the air preheater, and the arc edge end of the simply supported sector plate 9 is connected with the high temperature resistant pulley structure 7; the high-temperature resistant pulley structure 7 is as high as the sealing sheet 4 in the air preheater.

During operation, the simply-supported sector plate 9 is similar to a simply-supported beam, the circle center angle end of the simply-supported sector plate 9 is hinged through the hinge shaft 8 and can only rotate according to the constraint of the hinge shaft 8, the arc edge end of the simply-supported sector plate 9 is supported through the high-temperature-resistant pulley structure 7, the simply-supported sector plate 9 is guaranteed to always follow the deformation of the air preheater rotor, and meanwhile the top of the high-temperature-resistant pulley structure 7 is equal to the top of the sealing piece 4 in height, so that the constant gap between the sector plate and the sealing piece 4 is guaranteed.

For a rotary air preheater, a common 36-bin-divided air preheater is characterized in that a high-temperature-resistant pulley structure 7 is mounted on the outer edge of each bin of an air preheater rotor frame 6, and two high-temperature-resistant pulley structures 7 are always used for supporting the arc edge end of a simply-supported sector plate 9 in rotation so as to ensure the supporting strength, and meanwhile, the material of the simply-supported sector plate 9 can also be selected from lighter aluminum and other materials.

The rotary air preheater can be used for two-divided-bin, three-divided-bin and four-divided-bin rotary air preheaters, does not influence the original sealing sheet structure of a unit, provides a better working environment for the original sealing of the air preheater due to constant clearance, reduces the failure condition of a sealing structure caused by the change of the clearance, and has the advantages of ingenious, reasonable and simple structure, small maintenance amount and no friction of moving and static components.

The high-temperature-resistant pulley structure 7 is fixed on the outer edge of the rotor frame 6 of the air preheater, each sealing sheet 4 corresponds to one high-temperature-resistant pulley structure 7, two high-temperature-resistant pulley structures 7 are always used for supporting the arc edge end of the simply-supported sector plate 9 in the rotation process, so that sufficient supporting force is ensured, and the simply-supported sector plate 9 can be made of conventional steel or light metal such as aluminum.

The invention does not influence the original sealing sheet structure of the unit, provides a better working environment for the original sealing of the air preheater because the clearance is constant, and reduces the failure condition of the sealing structure caused by the change of the clearance.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.