阅读说明：本技术 一种炉膛l型屏式过热器防扭曲变形结构 (Distortion-proof structure of L-type platen superheater for furnace chamber ) 是由 印丽华 肖琪 陆晓焰 于 2020-04-30 设计创作，主要内容包括：本发明涉及屏式过热器结构技术领域,具体为一种炉膛L型屏式过热器防扭曲变形结构,其能够有效解决屏式过热器C形弯曲和扭曲问题,确保锅炉安全运行,其包括屏进口集箱、屏出口集箱、汇集管路,所述屏进口集箱与所述屏出口集箱之间由管屏连接,所述汇集管路通过连接管连接高过入口集箱,其特征在于,所述管屏内侧的屏过管子与所述屏进口集箱的连接处设置有节流孔,所述屏出口集箱一端通过U形弯管连接所述汇集管路,每个所述屏出口集箱单独连接一个恒力吊架,所述连接管的竖直段两侧分别设置有限位板,所述连接管经过预冷拉处理。(The invention relates to the technical field of a screen type superheater structure, in particular to an anti-twisting deformation structure of a furnace L type screen type superheater, which can effectively solve the problems of C-shaped bending and twisting of the screen type superheater and ensure the safe operation of a boiler.)

1. The utility model provides a furnace L type screen over heater prevents distorting transform structure, it includes that screen import collection case, screen export collection case, collect the pipeline, screen import collection case with connect by the tube panel between the screen export collection case, it connects to exceed the entry collection case through the connecting pipe to collect the pipeline, a serial communication port, the pipe is crossed to the inboard screen of tube panel with the junction of screen import collection case is provided with the orifice, screen export collection case one end is passed through U-shaped return bend connection collect the pipeline, every screen export collection case a constant force gallows of single connection, the vertical section both sides of connecting pipe are provided with the limiting plate respectively, the connecting pipe is drawn through the precooling and is handled.

2. The anti-distortion structure of a platen superheater of furnace L type as claimed in claim 1, wherein, except for two outer platen tubes, the other platen tubes are provided with orifices at the junctions with the platen inlet header.

Technical Field

The invention relates to the technical field of platen superheater structures, in particular to an anti-twisting deformation structure of a furnace L type platen superheater.

Background

The arrangement, the supporting and the pipeline form of the current L type platen superheater of a boiler hearth are shown in figures 1 and 2, a platen inlet header is welded with a front wall water-cooled wall and is a fixed point, when the boiler operates, because the temperature of a medium (steam) in the platen superheater is higher than the temperature of a medium (steam-water mixture) in a water-cooled wall pipe, the temperature of the medium (steam) in the platen superheater and the water-cooled wall pipe are different, the wall temperature of the platen superheater and the water-cooled wall pipe is different, the expansion amount is different, so that an outlet header of the platen superheater can expand upwards, the upward expansion amount is the expansion amount of the platen minus the expansion amount of the water-cooled wall, the expansion amount is generally 20-50mm (depending on the height of the platen), if the platen outlet header can not.

The screens of boilers operated at present all have deformation and distortion of different degrees, and the solution of screen deformation and distortion needs to be started from many aspects: 1. the distortion problem with single-panel screens. The individual panel distortions are due to the differences in temperature between the tubes of the panel, resulting in different amounts of expansion. The connection of the screens by flat steel restrains the expansion difference between the pipes, so that the screens can generate distortion. When the boiler is operated, the temperature of the central side of the hearth is high, the radiation intensity is high, and meanwhile, the radiation intensity of the pipe on the inner side of the screen is low due to cold radiation of a water cooling wall, so that the temperature of the pipe wall on the central side of the hearth is high, and the temperature of the pipe wall on the inner side is low. In order to achieve a substantially uniform wall temperature between the inner and outer tubes, the flow rate of the steam in the outer tube needs to be increased to accelerate the cooling of the tubes. 2. The screen outlet collection pipeline of the original structure is arranged at the top of the screen outlet collection box (figures 1 and 2), the screen outlet collection box and the screen outlet collection box are connected through a phi 159 pipe, and the top constant force hanging bracket is arranged on the pipeline between the two screens, so that the arrangement can save the number of the constant force hanging brackets. However, when the boiler is in operation, the wall temperature of each plate screen is different due to the flue gas temperature deviation and the steam flow deviation in each plate screen, so that the expansion is different. The presence of the top headers now forces the upward expansion of each panel to be uniform, and the large expansion panels will experience a C-bend. 3. A connecting pipeline is arranged between the screen outlet and the inlet header, the temperature of the screen outlet is about 480 ℃, the pipeline expands when the pipeline runs, the horizontal expansion amount is about 40-50mm, and the screen can be pushed to move towards the front direction of the furnace, so that the screen is jammed when penetrating through the top of the furnace, and the upward expansion of the screen is influenced.

Disclosure of Invention

In order to solve the problem of distortion and deformation of the existing platen superheater, the invention provides an anti-distortion structure of a furnace L type platen superheater, which can effectively solve the problems of C-shaped bending and distortion of the platen superheater and ensure the safe operation of a boiler.

The technical scheme is that the anti-twisting deformation structure of the L-type platen superheater of the hearth comprises a platen inlet header, a platen outlet header and a collecting pipeline, wherein the platen inlet header is connected with the platen outlet header through a tube platen, the collecting pipeline is connected with the platen inlet header through a connecting pipe, and the anti-twisting deformation structure is characterized in that a throttle hole is formed in the joint of the platen inlet header and the platen inlet header, one end of the platen outlet header is connected with the collecting pipeline through a U-shaped bent pipe, each of the platen outlet header is independently connected with a constant-force hanger, two sides of a vertical section of the connecting pipe are respectively provided with a limiting plate, and the connecting pipe is subjected to pre-cooling pulling treatment.

The screen is further characterized in that the screen passing pipes except the two outer sides are removed, and throttle holes are formed in the joints of the remaining screen passing pipes and the screen inlet header.

After the invention is adopted, the arrangement of the throttling hole can reduce the flow area of the inner pipe, increase the resistance and reduce the flow speed, and the outer pipe is not throttled, so that the flow speed is increased and the pipe wall temperature of the outer pipe is reduced compared with the flow area of the inner pipe, so that the pipe wall temperature in the whole screen is basically the same, the screen distortion problem is solved, an independent constant force hanger is arranged in each screen outlet collection box, one end of each screen outlet collection box is led out through a U-shaped bent pipe and then is connected to a collection pipeline, the bent pipes can absorb vertical expansion, the upward expansion of each screen can be different and cannot influence each other, and the existence of the limiting plate is equivalent to the arrangement of a horizontal limiting point to ensure; 1 screen export collection case does not have the horizontal direction basically and removes, avoids appearing the jam, makes the screen can expand from top to bottom freely, and the precooling is drawn and is handled and effectively reduced thermal state inflation volume and expansibility, and to sum up the crooked and distortion problem of C shape of screen is crossed in the solution boiler operation that can be fine, makes the boiler safe operation.

Drawings

FIG. 1 is a front view of a prior art structure;

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a front view of the structure of the present invention;

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a schematic view of the structure of the orifice;

FIG. 6 is a schematic view of an unopened orifice;

fig. 7 is a schematic diagram showing a comparison between a normal screen and a distorted screen.

Detailed Description

Referring to fig. 3, 4, 5, 6, an anti-distortion structure of a furnace L platen superheater is disclosed, which includes a platen inlet header 1, a platen outlet header 2, and a collecting pipe 3, wherein the platen inlet header 1 and the platen outlet header 2 are connected by a platen 4, the collecting pipe 3 is connected to the platen inlet header 6 via a connecting pipe 5, a throttle hole 8 is provided at a joint between a platen pipe 7 inside the platen 4 and the platen inlet header 1, generally, two platen pipes 7 outside the platen pipes are not opened, all openings of the header are equal to an inner diameter of a pipe joint, and the remaining platen pipes 7 are provided with throttle holes 8 at a joint between the platen pipe 7 and the platen inlet header 1, the existence of the throttle holes 8 can reduce a flow area of an inner pipe, increase resistance, reduce a flow rate, and reduce a flow rate of the outer pipe because the outer pipe is not throttled, a flow area of the inner pipe is large relative to a flow area of the inner pipe, increase the flow rate, reduce a temperature of the entire inner pipe wall of the platen pipe, solve a problem of the platen pipe, one end of the platen header 2 is connected by a U-shaped header pipe, and a hanger 9, and a hanger for reducing a vertical load of the platen pipe, so as much as a horizontal expansion pipe, a hanger, the expansion force of the platen pipe is reduced as a hanger, the hanger is reduced as a hanger for reducing a horizontal expansion force of the expansion pipe, the expansion pipe is reduced as much as a horizontal expansion pipe, the expansion pipe hanger is reduced as much as possible, the expansion pipe, the expansion.