CN203893704U

CN203893704U - Non-isometric dual helical baffle plate tubular heat exchanger

Info

Publication number: CN203893704U
Application number: CN201420051246.7U
Authority: CN
Inventors: 赵建军; 赵桂锋; 闵春华; 施乃溶
Original assignee: NANTONG SHUGUANG ELECTROMECHINCAL ENGINEERING Co Ltd
Current assignee: NANTONG SHUGUANG ELECTROMECHINCAL ENGINEERING Co Ltd
Priority date: 2014-01-27
Filing date: 2014-01-27
Publication date: 2014-10-22
Anticipated expiration: 2024-01-27

Abstract

A non-isometric dual helical baffle plate tubular heat exchanger relates to a tubular heat exchanger used in industries such as petroleum, chemical industry, electric power and sea water desalination. The non-isometric dual helical baffle plate tubular heat exchanger comprises fixed tube plates, a shell, heat exchange tubes, a baffle plate group and a middle fixing tube; a heat exchange tube bundle formed by the heat exchange tubes penetrates through the baffle plate group and is arranged between the two fixed tube plates; the baffle plate group is of a helical type formed by lapping four quarter sector-shaped baffle plates and is provided with two helical runners, and the screw pitch is gradually increased along the flowing axis direction. The dual helical baffle plates are adopted, so the flowing consistency is ensured, fluid cannot leak from a triangular area, and the heat exchange efficiency is improved. The flow direction of the fluid becomes stable due to the inclined sector baffle plates, the flow pressure loss is reduced, vibration is reduced and the service life of the heat exchanger is prolonged; the non-equal thread pitch baffle plates are adopted, so comprehensive heat exchange performance of the heat exchanger is improved, the heat exchange coefficient is higher and the flow resistance is smaller under the same pressure drop, and the non-isometric dual helical baffle plate tubular heat exchanger is especially suitable for the fluid with high viscosity.

Description

A kind of non-equidistant double helix baffle shell-and-tube heat exchanger

Technical field

The utility model relates to a kind of at oil, chemical industry, electric power, the shell-and-tube heat exchanger using in the industry such as desalinization, specifically a kind of novel non-equidistant double helix baffle shell-and-tube heat exchanger.

Background technology

China is in the high speed development stage now, and energy resource consumption is high, has caused energy security and environmental problem, wherein improves efficiency of energy utilization and energy-saving and emission-reduction and becomes the key link addressing this problem.In AND ENERGY RESOURCES CONSUMPTION IN CHINA, industry accounts for share maximum, exceedes 70% of energy resource consumption total amount, its PetroChina Company Limited., and chemical industry, metallurgy, electric power and heating power department are all major power consumers, in these high energy consumption departments, are using in a large number various heat exchangers.According to statistics, in modern chemistry industry, the investment of heat exchanger used accounts for greatly 30% of equipment investment, and in oil plant, heat exchanger accounts for 40% left and right of equipment investment, and in sea water desalting equipment, proportion is higher.Improve energy efficiency and the economic benefit of China's industrial circle, essential for the research and development of high-effect energy-saving heat-exchanger.

In shell-and-tube heat exchanger, have cold and hot two kinds of fluids, a kind of fluid flows in pipe, and one other fluid flows at shell-side, carries out exchange heat by heat exchanger tube.Conventionally at shell-side, deflection plate is set and is used for supporting tube bank, change shell fluid flow direction simultaneously, increase turbulent flow to reach the object of enhanced heat exchange.In former deflection plate, common single-screw deflection plate only can be arranged the deflection plate of a small amount of several pitch, and the deflection plate number of arranging in common baffle heat exchanger is far more than this.Be unfavorable for like this formation of mobile whirlpool because runner is too short, again due to leaky between adjacent baffle, segment fluid flow flows away from the trigonum between two segmental baffles, there is serious leakage current problem, cause in addition heat exchanger shell-side flow resistance to increase, also affected the heat exchange property of heat exchanger.

Utility model content

For the deficiencies in the prior art, the utility model provides a kind of non-equidistant double helix baffle shell-and-tube heat exchanger.

The utility model comprises fixed tube sheet, housing, heat exchanger tube, baffle groups, middle stationary pipes, the heat-exchanging tube bundle of described multiple heat exchanger tube compositions that be arranged in parallel is arranged on two fixing tube sheets through baffle groups, baffle groups is the spiral form with two helical flow paths forming by after four 1/4th segmental baffle overlap joints, and described pitch runner increases gradually along fluid flow direction.

Segmental baffle of the present utility model can be 1/6th fan-shaped, forms baffle groups by six described segmental baffles, forms two helical flow paths.

Every deflection plate in first group of baffle groups of the utility model becomes 15 degree angles with level, on later every group of deflection plate, every deflection plate and horizontal sextant angle increase gradually, thereby increases pitch.

Every deflection plate in first group of baffle groups of the utility model becomes 50 degree angles with level, on later every group of deflection plate, every deflection plate and horizontal sextant angle reduce gradually, thereby reduces pitch.

The deflection plate helical angle of spiral described in the utility model increases successively by direction of flow or reduces successively or interlace conversion.

Its continuous helical flow path of the utility model can be that left hand helix can be also right-handed helix.

The utility model improves single-screw baffle heat exchanger, adopt double helix deflection plate, four 1/4th fan-shapedly form a baffle groups through row point overlap joint, fluid forms two helical flow paths under the guide functions of segmental baffle group, and fluid continuously changes direction in mobile forward process, thereby produces whirlpool enhanced heat exchange, two other helical flow path has ensured mobile continuity, fluid can be from trigonum leakage current, fully with heat-exchanging tube bundle through row heat exchange, raising heat exchange efficiency.The segmental baffle tilting steadily changes direction of flow, reduces the crushing that flows, and reduces vibrations.Heat exchanger after improvement can make fluid according to reasonable manner is mobile more, increase the flow velocity of shell-side fluid, less scaling, there is not leakage current, make heat exchanger structure compacter, reduce greatly flow resistance, improve heat exchange efficiency, heat-exchanging tube bundle is had good stability, improved the service life of heat exchanger.

The utility model also to uniform pitch baffle heat exchanger through having gone improvement, adopted non-uniform pitch baffle heat exchanger, improved the comprehensive heat exchange property of heat exchanger, under same pressure drop, the coefficient of heat transfer is higher and flow resistance is less, is especially applicable to full-bodied fluid.

The double-shell side shell-and-tube heat exchanger that the utility model adds sleeve pipe to centre, can be through row heat convection two helical duct central fluid also through having gone improvement, has strengthened the mixing of housing center and ambient fluid, enhanced heat exchange.

Brief description of the drawings

Fig. 1 is non-equidistant double helix baffle shell-and-tube heat exchanger structural representation;

Fig. 2 is non-equidistant double helix baffle shell-and-tube heat exchanger baffle groups arrangement mode structural representation;

Fig. 3 is non-equidistant double helix baffle shell-and-tube heat exchanger part deflection plate overlap joint schematic diagram.

Detailed description of the invention

As shown in Figure 1: this non-equidistant double helix baffle shell-and-tube heat exchanger comprises fixed tube sheet 1, housing 2, heat exchanger tube 3, baffle groups 4, middle stationary pipes 7, the heat-exchanging tube bundle that multiple heat exchanger tubes that be arranged in parallel 3 form is fixed on two fixed tube sheets 1 through deflection plate 4, and baffle groups forms after having four 1/4th segmental baffle point overlap joints.Baffle groups forms two helical ducts 5,6.In baffle groups 4 every deflection plate the same with level inclination, inclination angle e, between 5 ~ 50 degree, and increases gradually or reduces to the each deflection plate in flow direction baffle groups and the inclination angle of level.

Cold (heat) medium is entered by the import on housing 2, in shell side through two independent spiral passages 5,6 are flowed out by the outlet on housing 2 again, heat (cold) medium is entered by one end fixed tube sheet 1, the heat-exchanging tube bundle that multiple heat exchanger tubes that be arranged in parallel 3 of flowing through form, is being flowed out by other one end fixed tube sheet 1.Not equidistant double helix passage 5,6 not only can be avoided flow dead, and can improve unit pressure drop, reduces flow resistance, enhanced heat exchange.

Claims

1. a non-equidistant double helix baffle shell-and-tube heat exchanger, comprise fixed tube sheet, housing, heat exchanger tube, baffle groups, middle stationary pipes, the heat-exchanging tube bundle of described multiple heat exchanger tube compositions that be arranged in parallel is arranged on two fixing tube sheets through baffle groups, baffle groups is the spiral form with two helical flow paths forming by after four 1/4th segmental baffle overlap joints, it is characterized in that described pitch runner increases gradually along fluid flow direction.

2. non-equidistant double helix baffle shell-and-tube heat exchanger according to claim 1, is characterized in that segmental baffle is 1/6th fan-shaped, forms baffle groups by six deflection plates, forms two helical flow paths.

3. non-equidistant double helix baffle shell-and-tube heat exchanger according to claim 1, it is characterized in that every deflection plate in first group of baffle groups becomes 15 degree angles with level, on later every group of deflection plate, every deflection plate and horizontal sextant angle increase gradually, thereby increase pitch.

4. non-equidistant double helix baffle shell-and-tube heat exchanger according to claim 1, it is characterized in that every deflection plate in first group of baffle groups becomes 50 degree angles with level, on later every group of deflection plate, every deflection plate and horizontal sextant angle reduce gradually, thereby reduce pitch.

5. non-equidistant double helix baffle shell-and-tube heat exchanger according to claim 1, is characterized in that the deflection plate helical angle of described spiral increases successively by direction of flow or reduces successively or interlace conversion.

6. non-equidistant double helix baffle shell-and-tube heat exchanger according to claim 2, is characterized in that described in it that continuous helical flow path is left hand helix or right-handed helix.