CN202329261U - Multi-region pipe bundle of condenser - Google Patents

Abstract

The utility model relates to a multi-region pipe bundle of a condenser. The multi-region pipe bundle is characterized by being composed of at least two rows of small pipe bundles, wherein two edges of each row of the small pipe bundles are provided with vapor flow channels; a bottom heat-returning region is arranged below the small pipe bundles; each row of the small pipe bundles comprises a trapezoid-shaped main condensing region; a vapor accepting region is formed at the upper end of the main condensing region and an octagonal blank region is reserved in the bottom part of the main condensing region; the central line of the octagonal blank region is overlapped with the central line of the main condensing region; an air exhausting channel is arranged on the central line in the main condensing region; the air exhausting channel is communicated with the octagonal blank region; inclined downwards small vapor channels are symmetrically arranged at left and right sides of the main condensing region; a rectangular air cooling region is arranged in the middle of the octagonal blank region; and the main condensing region and the air cooling region are formed by mutually adjoining and arraying pipes which are arranged in a triangular shape. The multi-region pipe bundle of the condenser, disclosed by the utility model, has the advantages that a vapor flow line is smooth, no dead zones exist and the heat-conducting performance is good.

Description

A kind of multi-area tube bundle of condenser

Technical field

The utility model relates to a kind of multi-area tube bundle of condenser, is applied on the industry condenser equipment of power station.

Background technology

Condenser is one of visual plant in the Power Plant Thermal System; When auxiliary device operate as normal such as water circulating pump and vavuum pump; The every reduction of the vacuum of condenser 1kPa; The efficient of steam-turbine plant will increase 1～2%, thus how to obtain comparatively ideal vacuum, particularly important to improving large-scale unit economy.

Steam has just got into tube bank and the time can take place to condense on a large scale, and air content is seldom in this moment steam; Simultaneously extract the district at steam-air mixture, it is quite slow that the phenomenon of condensing takes place, and be accompanied by the serious surfusion of condensate generation; Steam has just got into when tube bank, and the resistance that the scouring intensity and the vapour phase of overhead coil bundle flowed is big; It is unreasonable that tube bank is arranged, heat load distribution is inhomogeneous, causes the heat transfer dead angle, affects mean temperature difference; It is unreasonable that tube bank is arranged, arranges the too intensive vapour locking height that causes; It is unreasonable that tube bank is arranged, causing does not have enough backheat spaces, makes hot-well depression, and oxygen content is high, and is very big to the safety hazard of whole unit.

Summary of the invention

The purpose of the utility model provides the little tube bank of the favorably situated condenser multizone of a kind of tube bank.

In order to achieve the above object, the technical scheme of the utility model has provided a kind of multi-area tube bundle of condenser, it is characterized in that; By at least two row tubule Shu Zucheng, the both sides of the little tube bank of every row are steam flow channel, are bottom thermal region again below little tube bank; The little tube bank of every row; Comprise trapezoidal main condensing zone, be formed with in the upper end of main condensing zone and meet the vapour district, in the bottom of main condensing zone, leave an octagonal white space; The axis of octagon white space and the dead in line of main condensing zone; Have the exhaust passage on the axis in main condensing zone, the exhaust passage is communicated with the octagon white space, must have the steam passage aisle under oblique in the left and right sides of main condensing zone symmetry; Be provided with rectangular air cooling zone at the middle part of octagon white space, main condensing zone and air cooling zone are formed near arrangement by the pipe that is triangularly arranged each other.

Little tube bank in the tube bank that the utility model provides is adopted rounded projections arranged on the pipe arrangement mode, can obtain the higher heat transfer and the ability of mass transfer.The air cooling zone reasonable Arrangement of little tube bank; Steam is cooled off step by step to air cooling zone by tubule bundle outside and condenses; Tubule bundle inlet flow is short to the steam flow flow process of bleeding point; And prevent new steam flow that does not condense as yet and the steam flow blending of having condensed through cooling tube, and effectively extract non-condensing gas out, improved the heat transfer property of condenser.Simultaneously, the condensate that the layout of the intrafascicular air cooling zone of this tubule falls main condensing zone does not contact with the high vapour-gas mixture of air content, and has rational steam channel and backheat space to make an amount of steam flow tube bank bottom backheat condensate.

The utility model has the advantages that: the steam streamline is level and smooth, does not have the dead band, has the good heat transfer performance.

Description of drawings

The sketch map of a kind of multi-area tube bundle of condenser that Fig. 1 provides for the utility model.

The specific embodiment

Specify the utility model below in conjunction with embodiment.

As shown in Figure 1, the sketch map of a kind of multi-area tube bundle of condenser that provides for the utility model, by two row tubule Shu Zucheng, the both sides of the little tube bank of every row are steam flow channel 7, are bottom thermal region 4 again below little tube bank.The number of little tube bank satisfies the requirement of the different cooling water inflow of each condenser, adapts to if the thermic load of condenser changes the number that then can change little tube bank.

The little tube bank of every row comprises trapezoidal main condensing zone 2; Be formed with in the upper end of main condensing zone 2 and meet vapour district 1; In the bottom of main condensing zone 2, leave an octagonal white space, the dead in line of the axis of octagon white space and main condensing zone 2 has exhaust passage 6 on the axis in main condensing zone 2; Exhaust passage 6 is communicated with the octagon white space; Must have the steam passage aisle 5 under oblique in the left and right sides of main condensing zone 2 symmetry, be provided with rectangular air cooling zone 3 at the middle part of octagon white space, main condensing zone 2 is formed near arrangement by the pipe that is triangularly arranged with air cooling zone 3 each other.

The course of work of the tube bank of the utility model is: steam gets off from connecing neck, and a part of steam is to meeting vapour district 1, and the unexpected variation of circulation area makes the vapour locking here account for the sizable ratio of total vapour locking.In order to reduce the vapour locking here, need to strengthen tube bank admission girth, increase the admission width of flow path and reduce the flow velocity that gets into tube bank, reduce the pressure loss with this.Therefore a part of steam gets into main condensing zone 2 through peripheral steam passage aisle 5, and along with constantly condensing of steam, flow constantly reduces.Further cool off the not condensing vapour of remnants again to air cooling zone 3; Reduce the working medium loss, increase the degree of supercooling of vapour-gas mixture, reduce the equipment load of drawing gas; The vapour-gas mixture flows to bleeding point in air cooling zone 3; Its path is short and straight, and it is little that mixture is fallen to the pressure of the whole distance of bleeding point, and last non-condensing gas is extracted out by vavuum pump.Another fraction steam arrives bottom thermal region 4 again by both sides steam flow channel 7, and the condensate in the hot well is carried out hot deoxygenation again, reduces condensate undercooling, reduces oxygen content.

Claims (1)

1. multi-area tube bundle of condenser; It is characterized in that by at least two row tubule Shu Zucheng, the both sides of the little tube bank of every row are steam flow channel (7); It below little tube bank bottom thermal region (4) again; The little tube bank of every row comprises trapezoidal main condensing zone (2), is formed with in the upper end of main condensing zone (2) and meets vapour district (1), in the bottom of main condensing zone (2), leaves an octagonal white space; The dead in line of the axis of octagon white space and main condensing zone (2); Have exhaust passage (6) on the axis in main condensing zone (2), exhaust passage (6) is communicated with the octagon white space, is arranged with the steam passage aisle (5) under oblique in the left and right sides of main condensing zone (2); Be provided with rectangular air cooling zone (3) at the middle part of octagon white space, main condensing zone (2) is formed near arrangement by the pipe that is triangularly arranged with air cooling zone (3) each other.