CN202614078U

CN202614078U - Constant-taper direct air-cooling steam distribution pipeline

Info

Publication number: CN202614078U
Application number: CN 201220188192
Authority: CN
Inventors: 姜丽娟; 孟丽娜; 梁美丽
Original assignee: Shanghai Electric Si Bike Engineering Co Ltd
Current assignee: Shanghai Electric Si Bike Engineering Co Ltd
Priority date: 2012-04-27
Filing date: 2012-04-27
Publication date: 2012-12-19
Anticipated expiration: 2022-04-27

Abstract

The utility model provides a constant-taper direct air-cooling steam distribution pipeline, which comprises a head pipe body and a tail pipe body which are positioned at the head end and the tail end respectively, and is characterized in that a taper pipe with constant taper is connected between the head pipe body and the tail pipe body. The constant-taper direct air-cooling steam distribution pipeline has the advantages that a plurality of variable-diameter pipes are substituted by using the taper pipe of the constant taper for distributing flow, the local energy loss is reduced to the greatest extent, the efficiency is increased and the energy consumption is reduced. Meanwhile, a material for the pipeline can also be saved, and the engineering construction cost is reduced. The pipeline has a large size; fluid is gas and liquid two-phase fluid; and the effect is obvious when the flow speed is large.

Description

A kind of with tapering Direct Air-Cooled steam distribution pipeline

Technical field

The utility model relates to a kind of with tapering Direct Air-Cooled steam distribution pipeline, belongs to Direct Air-Cooled power plant steam cooling technology field.

Background technology

The cooling in thermal power plant need consume great lot of water resources.With a 300MW water-cooled unit is example, and annual recirculated water consumption is above 5,000,000 tons.Especially as the northern area of coal main producing region, drought and water shortage.Direct Air-Cooled is that water-saving rate can reach more than 90% with the direct cooling medium of air conduct, and setting up the air cooling power station in the area of rich coal lack of water is optimal selection.The steam of discharging after the steam turbine work done; Blow-off line through the air cooling island is delivered in the steam distribution pipeline on the outdoor air cooling platform, is diverted in the following heat-exchanging tube bundle by the steam subtube, and the axial flow cooling blower makes air flow through the radiator outer surface; Take away heat, steam discharge is condensed into water; The current that condense flow back into the heat regenerative system of steam turbine again and utilize again.In the above-mentioned technological process, the reasonable distribution of steam flow is energy-conservation to whole air cooling system, raises the efficiency and plays crucial effects.The reasonable distribution of steam flow is accomplished by the steam distribution pipeline that is arranged in above the air cooling platform.

Steam energy loss mainly comprises along journey energy loss and local energy loss, and wherein local energy loss occurs in pipe fitting limit wall shape and sharply changes, the rate of flow of fluid sharply partial zones of adjustment that distributes.In fluid delivery process, shunting makes that fluid flow reduces in the pipeline; Consider economically, should reduce the diameter of next stage pipeline.The pipeline of different-diameter needs reducer union to connect.The local energy loss of reducer union place is along with the tapering of the ratio of importing and exporting diameter and contraction increases and increases.As shown in Figure 1, at present, steam-distributing pipe is that pipeline 1 a plurality of different-diameters is formed by connecting through a plurality of reducer unions 2 above the air cooling platform.Can know that through above-mentioned analysis existing steam-distributing pipe energy loss is bigger.

Summary of the invention

The purpose of the utility model provides a kind of steam distribution pipeline that reduces local energy loss, raises the efficiency, cuts down the consumption of energy.

In order to achieve the above object; The technical scheme of the utility model has provided a kind of with tapering Direct Air-Cooled steam distribution pipeline; Comprise the stem body and the afterbody body that lay respectively at the initial and end two ends, it is characterized in that: be connected with the constant conical pipe of tapering between stem body and the afterbody body.

Adopt a same tapering transition between the head and the tail of the utility model, form the minimum conical pipe of a tapering, can at utmost reduce the local energy loss in the steam-distributing pipe.Under the condition of equal caliber, the steam-distributing pipe of the utility model is capable of reducing energy consumption, improves air cooling system efficient.Simultaneously,, under equal energy consumption level, can adopt less pipe diameter, save the pipeline materials, reduce the engineering construction cost because the loss of steam-distributing pipe self-energy is lowered.

The utility model has the advantages that: adopt conical pipe to replace a plurality of reducings and carry out the distribution of flow, farthest reduced local energy loss, improved efficient, cut down the consumption of energy with tapering.Simultaneously also can save the pipeline materials, reduce the engineering construction cost.Above-mentioned advantage is bigger in line size, and fluid is that biphase gas and liquid flow and flow velocity are more obvious when big.

Description of drawings

Fig. 1 is an original steam distributing pipe sketch map;

A kind of sketch map that Fig. 2 provides for the utility model with tapering Direct Air-Cooled steam distribution pipeline.

The specific embodiment

For making the utility model more obviously understandable, now with a preferred embodiment, and conjunction with figs. elaborates as follows.

As shown in Figure 2, what the utility model provided is a kind of with tapering Direct Air-Cooled steam distribution pipeline, comprises the stem body 2 and the afterbody body 3 that lay respectively at the initial and end two ends, is connected with the constant conical pipe of tapering 4 between stem body 2 and the afterbody body 3.

During design, according to the energy loss calculation distribution duct import caliber of the flow that passes through fluid in the whole air cooling island steam distribution pipeline and system's permission.According to the assignment of traffic characteristic, reach the caliber that whole parameter such as air cooling island steam distribution pipeline length confirmed afterbody body 3; Calculate the contraction tapering of whole pipeline by above-mentioned steam distribution pipeline physical dimension.

Claims

1. one kind with tapering Direct Air-Cooled steam distribution pipeline, comprises the stem body (2) and the afterbody body (3) that lay respectively at the initial and end two ends, it is characterized in that: be connected with the constant conical pipe of tapering (4) between stem body (2) and the afterbody body (3).