阅读说明：本技术 空冷凝汽器单排管 (Single-row pipe of air-cooling condenser ) 是由 江瀚 王永新 薛海君 益平 张朋 于 2020-05-06 设计创作，主要内容包括：本发明涉及一种空冷凝汽器单排管,包括基管和蛇形翅片,所述基管横截面为扁形的管,基管的横截面外形尺寸为长度为120-175mm、宽度10-15mm；所述基管横截面长边所在的两侧面外部各设置一条蛇形翅片,所述蛇形翅片的厚度为0.1-0.22mm；所述蛇形翅片为间断型翅片或波纹型翅片。本发明增加基管的承压能力,翅片承受外压的应力大大减小,这样可降低翅片厚度,翅片可以开缝做成百叶窗式或桥片结构,也可以做成波浪型,以此来强化换热,从而提高单排管的换热性能。(The invention relates to a single-row tube of an air-cooled condenser, which comprises a base tube and a snake-shaped fin, wherein the cross section of the base tube is a flat tube, and the external dimension of the cross section of the base tube is 175mm in length and 10-15mm in width; the outer parts of two side surfaces where the long sides of the cross section of the base tube are located are respectively provided with a snake-shaped fin, and the thickness of each snake-shaped fin is 0.1-0.22 mm; the serpentine fins are discontinuous fins or corrugated fins. The invention increases the bearing capacity of the base pipe, the stress of the fins bearing external pressure is greatly reduced, thus the thickness of the fins can be reduced, the fins can be made into a shutter type or bridge plate structure by slotting, and can also be made into a wave type, thereby strengthening heat exchange and further improving the heat exchange performance of the single row of tubes.)

1. The utility model provides an air cooling condenser list calandria, includes parent tube (1) and snakelike fin (2), parent tube (1) cross section is the pipe of platykurtic, its characterized in that:

the cross section of the base pipe (1) has the external dimension of 120-175mm in length and 10-15mm in width;

the outer parts of two side surfaces of the long side of the cross section of the base tube (1) are respectively provided with a snake-shaped fin (2), and the thickness of the snake-shaped fin (2) is 0.1-0.22 mm;

the serpentine fins (2) are discontinuous fins or corrugated fins.

2. The single row of tubes of an air-cooled condenser of claim 1, wherein: the snakelike fins (2) are provided with louver type gaps at intervals, and the number of the slots of the louver type gaps is more than 2.

3. The single row of tubes of an air-cooled condenser of claim 2, wherein: the slotting inclination angle of the louver type slits is 15-25 degrees.

4. The single row of tubes of an air-cooled condenser of claim 1, wherein: the snakelike fin (2) interval is equipped with the bridge piece structure gap, the number of slotting of bridge piece structure gap is more than 2.

5. The single row of tubes of an air-cooled condenser of claim 1, wherein: the corrugated height of the corrugated fin is 1.5-2.5 mm.

6. The single row of tubes of an air-cooled condenser of claim 1, wherein: the serpentine fin (2) is made of aluminum or alloy aluminum.

7. The single row of tubes of an air-cooled condenser of claim 1, wherein: the base pipe (1) is made of a bimetal composite material, the outer layer is made of aluminum or alloy aluminum, and the inner layer is made of carbon steel or stainless steel.

8. The single row of tubes of an air-cooled condenser of claim 1, wherein: the snake-shaped fin (2) is connected with the base pipe (1) through brazing.

Technical Field

The invention relates to a single exhaust pipe of an air-cooling condenser, which is mainly applied to a direct air-cooling condenser for exhausting steam from a low-pressure cylinder of a power station or a coal chemical steam turbine.

Background

At present, a single row of finned tubes are often used as heat exchange elements in a direct air-cooling condenser for low-pressure cylinder steam exhaust of a condensing power station or a coal chemical steam turbine. The single-row tube consists of a base tube and fins welded outside the tube, the base tube is a rectangular flat tube, the fins are serpentine fins, and the fins in the tube bundle of the air-cooling condenser are arranged in a single row.

The single-row pipe has the advantages that the anti-freezing performance is good when the single-row pipe is used in cold regions in winter, the pressure difference in the pipes caused by inconsistent heat loads of the upper and lower heat exchange pipes of the multi-row pipe is avoided, and the phenomena of non-condensable gas accumulation and condensed water freezing are reduced.

However, the long edge size of this finned tube (single row tube) parent tube that uses at present is great, generally is more than 200mm, and the intraductal negative pressure state that is in of during operation, and the long edge rigidity of parent tube is yielding when receiving external pressure effect for a short time, so, the snakelike fin of base tube outside not only has the heat transfer function of reinforceing, but also bears the external pressure of finned tube, and the thickness of snakelike fin plays at least more than 0.25mm, has the effect that reduces the deformation of pressurized parent tube.

The base tube of the single-row tube has poor rigidity, the pressure bearing characteristic of the fins is relied on, the thickness of the fins is limited, the design of the fins is restrained, technical means such as slotting and reinforced heat exchange cannot be applied, and the heat exchange efficiency of the finned tube is low.

Disclosure of Invention

The invention aims to overcome the defects and provides a single-row tube of an air-cooling condenser, which can enhance the external pressure bearing capacity of a base tube, reduce the consumption of fin materials and improve the heat exchange efficiency.

The purpose of the invention is realized as follows:

a single-row tube of an air-cooled condenser comprises a base tube and a snake-shaped fin, wherein the cross section of the base tube is a flat tube, and the overall dimension of the cross section of the base tube is 175mm in length and 10-15mm in width;

the outer parts of two side surfaces where the long sides of the cross section of the base tube are located are respectively provided with a snake-shaped fin, and the thickness of each snake-shaped fin is 0.1-0.22 mm;

the serpentine fins are discontinuous fins or corrugated fins.

Preferably, the serpentine fins are provided with louver type slots at intervals, and the number of the slots of the louver type slots is more than 2.

Preferably, the slotting inclination angle of the louver type slots is 15-25 degrees.

Preferably, the serpentine fins are provided with bridge piece structure gaps at intervals, and the number of the slots of the bridge piece structure gaps is more than 2.

Preferably, the corrugated height of the corrugated fin is 1.5-2.5 mm.

Preferably, the serpentine fin is made of aluminum or aluminum alloy.

Preferably, the base pipe is made of a bimetal composite material, the outer layer is aluminum or alloy aluminum, and the inner layer is carbon steel or stainless steel.

Preferably, the serpentine fin is connected to the base pipe by brazing.

The invention has the beneficial effects that:

the base pipe is a flat pipe, the cross section of the base pipe has the overall dimension of 175mm in length and 10-15mm in width, the bearing capacity of the base pipe is improved, the stress of external pressure borne by the fins is greatly reduced, the thickness of the fins can be reduced, the fins can be made into corrugated shapes, and can also be made into louver type or bridge piece structures through slotting, so that heat exchange is enhanced, and the heat exchange performance of a single exhaust pipe is improved.

Drawings

Fig. 1 is an overall schematic view of the present invention.

Fig. 2 is a cross-sectional view of the present invention.

Fig. 3 is a schematic view of a fin of example 1.

Fig. 4 is a plan view of the fin of example 1.

Fig. 5 is a partially enlarged view of fig. 4.

FIG. 6 is a schematic view of a fin of example 2.

Fig. 7 is a top view of a fin of example 2.

FIG. 8 is a schematic view of a fin of example 3.

Fig. 9 is a top view of a fin of example 3.

In the figure: 1. a base pipe; 2. a serpentine fin.

Detailed Description