CN204830967U

CN204830967U - Ribbed tube

Info

Publication number: CN204830967U
Application number: CN201520342238.2U
Authority: CN
Inventors: 周群英
Original assignee: Shanghai Yinguo Thermal Equipment Co Ltd
Current assignee: Shanghai Yinguo Thermal Equipment Co Ltd
Priority date: 2015-05-25
Filing date: 2015-05-25
Publication date: 2015-12-02
Anticipated expiration: 2025-05-25

Abstract

The utility model relates to a ribbed tube, including heat exchange tube and fin, the heat exchange tube is two, and parallel arrangement, and the fin is a plurality of pieces, and radial just symmetrical is on two heat exchange tubes, and the heat exchange tube is oval heat exchange tube. The beneficial effects of the utility model are that: adopting oval heat exchange tube to replace circular heat exchange tube in the past, reducing the flue gas and wash away the transverse section who receives the hot side, reach the purpose that reduces the flue gas flow resistance, simultaneously because the disturbance that the local disturbance that the flue gas produced along oval pipe wall greatly gently produced in the flue gas along the pipe, the wearing and tearing volume that makes the pipe can have apparent reduction, and the flue gas increases along pipe wall flow time, and heat transmission effect is better.

Description

A kind of gilled tube

Technical field

The utility model relates to heat-transfer pipe field, particularly the oval gilled tube of a kind of double H-type.

Background technology

Flue gas loss is a most important heat loss during station boiler runs, and is generally about 5%-12%, accounts for the 60%-70% of boiler heat loss, generally, exhaust gas temperature often increases by 10 DEG C, and heat loss due to exhaust gas increases 0.6%-1%, corresponding many consumption coal 1.2%-2.4%.If for the 410t/h high-pressure boiler using calorific value 2000KJ/KG coal, then annual many consumption nearly ten thousand tons of power power coals, it is comparatively assorted and poor that a lot of boilers due to Power Plant in China use coal, cannot ensure to use design coal, exhaust gas temperature often all exceedes design load, about high than design load 20-50 DEG C.While causing boiler efficiency to reduce, bring the reduction greatly of the dedusting of Power Plant afterbody, desulfurized effect, so, reduce exhaust gas temperature, for saving fuel and reduction pollution, there is important practical significance, more by the boiler technology reform improved for the purpose of dust collector efficiency to reduce exhaust gas temperature in practice.Usual transformation be before deduster Installing Low Pressure Economizer (because of the economizer in similar boiler, pressure is significantly less than economizer in boiler, therefore claim low-pressure coal saver), by lowering flue-gas temperature, the flue gas ratio resistance entering deduster is declined to a great extent, thus reach and improve the object of efficiency of dust collection, deduster usually can be made to discharge have former standard≤50 μm be reduced to new standard≤20 μm.

But because most of power plant's back-end ductwork space is too little, the actual conditions such as abrasionproof requires higher, and the pressure head allowance of air-introduced machine is little.Require to adopt spreading coefficient large and the heating surface of abrasionproof, require that resistance is as far as possible little simultaneously.Generally adopt H type gilled tube and spiral finned tube 2 kinds of heating surface tube forms at present.H type gilled tube is close with spiral finned tube on area spreading coefficient, and is greatly better than spiral finned tube at abrasionproof and the characteristic reduced in resistance.Therefore, the transformation of mostly unit energy-saving and emission-reduction at present adopts H type gilled tube as heating surface.Present patent application unit has carried out to nearly 30 units the transformation increasing low-pressure coal saver at nearly 4 years, and the whole of employing are H type gilled tubes, runs the longest to reach 3 years.The project implementation finds that most electric field is because of Installing Low Pressure Economizer, needs to carry out extending capacity reformation to air-introduced machine simultaneously simultaneously, and improvement expenses is large, simultaneously by follow-up service, finds the unit of indivedual ature of coal difference, still there is certain abrasion condition.

Utility model content

The purpose of this utility model is to solve the problem, and provides that a kind of smoke flow resistance is low, good heat-transfer, anti-ash cutting ability are strong, the oval gilled tube of the double H-type of long service life.

Technical scheme is as follows

A kind of gilled tube, comprise heat exchanger tube and fin, described heat exchanger tube is two, and be arranged in parallel, and described fin is some, radial and be symmetrically welded on two heat exchanger tubes, and it is characterized in that, described heat exchanger tube is elliptical heat exchange tube.

As further improvement, the spacing distance between described fin and fin is 10-40mm.

As further improvement, the width of described fin is 3-4 times of elliptical heat exchange tube minor axis.

As further improvement, the height of described fin is 4-5 times of elliptical heat exchange tube major axis.

Beneficial effect

The utility model device adopts elliptic heat exchange tube replacement circular heat exchanger tube in the past, reduce the lateral cross section of sweep of gases heating surface, reach the object reducing smoke flow resistance, simultaneously because flue gas is lighter than along the local dip that oval tube wall produces the disturbance that flue gas produces along pipe greatly, make the wear extent of pipe can have remarkable reduction, flue gas increases along tube wall flowing time, and heat-transfer effect is better.

Accompanying drawing explanation

The utility model is further illustrated below in conjunction with accompanying drawing and case study on implementation.

Fig. 1 is front view of the present utility model;

Fig. 2 is side view of the present utility model.

Number in the figure:

1, heat exchanger tube 2, fin

Detailed description of the invention

For making to have a better understanding and awareness architectural feature of the present utility model and effect of reaching, coordinating detailed description in order to preferred embodiment and accompanying drawing, being described as follows:

Shown in Fig. 1 and Fig. 2, a kind of gilled tube, comprises heat exchanger tube 1 and fin 2, and heat exchanger tube 1 is two, and be arranged in parallel, and fin 2 is some, radial and be symmetrically welded on two heat exchanger tubes, and heat exchanger tube 1 is elliptical heat exchange tube.Some fins 2 and heat exchanger tube 1 butt-joint, spacing distance between fin and fin is 10-40mm, the width of fin is 3-4 times of elliptical heat exchange tube minor axis, the height of fin is 4-5 times of elliptical heat exchange tube major axis, the similar English alphabet of shaping rear profile two H are superimposed, so form the oval gilled tube of a kind of novel H type.

Vertical or horizontal flue before oval for H type gilled tube is placed in deduster, flue gas stream from the H type indentation, there of H type gilled tube from the bottom up (when being arranged vertically) or from left to right (time horizontally disposed) wash away gilled tube, air-flow obtains major axis along elliptical heat exchange tube and flows to next row heat exchanger tube, therefore elliptic heat exchange tube replacement circular heat exchanger tube is in the past adopted, reduce the lateral cross section of sweep of gases heating surface, reach the object reducing smoke flow resistance, simultaneously because flue gas is lighter than along the local dip that oval tube wall produces the disturbance that flue gas produces along pipe greatly, make the wear extent of pipe can have remarkable reduction, flue gas increases along tube wall flowing time, heat-transfer effect is better.

In sum, be only preferred embodiment of the present utility model, not be used for limit the utility model implement scope, all equalizations of doing according to shape, structure, feature and the spirit described in the utility model right change and modify, and all should be included in right of the present utility model.

Claims

1. a gilled tube, comprise heat exchanger tube and fin, described heat exchanger tube is two, and be arranged in parallel, and described fin is some, radial and be symmetrically welded on two heat exchanger tubes, it is characterized in that, described heat exchanger tube is elliptical heat exchange tube, and the spacing distance between described fin and fin is 10-40mm, the width of described fin is 3-4 times of elliptical heat exchange tube minor axis, and the height of described fin is 4-5 times of elliptical heat exchange tube major axis.