CN201876185U

CN201876185U - Folding baffle for spiral baffle heat exchanger

Info

Publication number: CN201876185U
Application number: CN2010201768951U
Authority: CN
Inventors: 王斯民; 张卫华; 张早校; 文键
Original assignee: Individual
Current assignee: China Petroleum Engineering and Construction Corp
Priority date: 2010-04-30
Filing date: 2010-04-30
Publication date: 2011-06-22
Anticipated expiration: 2020-04-30

Abstract

The utility model provides a folding baffle for a spiral baffle heat exchanger. The folding baffle provided solves the problems that gaps are easy to form while overlapping the plane baffles in the prior art thereby resulting in unfavorable heat exchange because of partial short circuit and difficulties in total heat transfer coefficient improvement. However, the aim of blocking the fast flow channel is achieved by using the folding baffle to replace the panel baffle. Compared with the tube bank of a spiral plane baffle heat exchanger, the tube bank of the spiral folding baffle heat exchanger improves the total heat transfer coefficient by about 10% with completely same manufacture cost and difficulty.

Description

Spiral baffle heat exchanger folding face deflection plate

Technical field

The utility model relates to a kind of deflection plate, is specifically related to a kind of spiral baffle heat exchanger with folding face deflection plate, belongs to the shell and tube shell-and-tube heat exchanger and manufactures and designs the field.

Background technology

Widespread usage is segmental baffle in the tradition shell and tube shell-and-tube heat exchanger and since exist choked flow and pressure drop big, mobile stagnation region, easily fouling, vibration condition easy defectives such as inefficacy are down arranged, replaced by helical baffles gradually in recent years.

Compare with traditional segmental baffle board heat exchangers, the shell side resistance of spiral baffle heat exchanger reduces, and heat transfer coefficient is higher, and medium is difficult for incrustation and fouling in shell side, can the macrocyclic operation of high efficiency in the use.The design and manufacturing technology of this kind equipment is very ripe at home at present, and it has obtained extensive use in industries such as oil, chemical industry, electric power, metallurgy.

The deflection plate of the spiral baffle heat exchanger that is adopted is the fan-shaped plan deflection plate of about 1/4 circle in the market, and the fan-shaped plan deflection plate as shown in Figure 1.When medium flowed in shell side, medium was in approximate helical flow state.

But find that in the use of fan-shaped plan deflection plate it is compared with segmental baffle board heat exchangers, shell-side pressure drop is little, heat transfer coefficient descends advantages such as slow and long-term operation though have, and the raising of overall heat-transfer coefficient is also not obvious.Especially optimize under the unfavorable situation in technology Calculation, even when operation at equipment initial stage overall heat-transfer coefficient can occur and be lower than the phenomenon of segmental baffle board heat exchangers; This is that this opening position can form a quick runner, causes partial short-circuit, is unfavorable for heat exchange because the fan-shaped plan plate can form gap when overlap joint.The spiral baffle heat exchanger overall heat-transfer coefficient of Shi Yonging is not very big in the market.

Summary of the invention

The utility model provides a kind of spiral baffle heat exchanger with folding face deflection plate, forms gap when mainly having solved existing plane deflection plate overlap joint, causes partial short-circuit to be unfavorable for heat exchange, is difficult to improve the problem of overall heat-transfer coefficient.

The concrete technical solution that the utility model provides is as follows:

This spiral baffle heat exchanger is respectively arranged with knuckle with the both sides of folding face deflection plate; Two knuckles are that central symmetry axis is symmetrical with the angular bisector of rolling over face deflection plate central angle, and two knuckles are respectively rotating shaft rotation bending with the broken line, and the rotation wrap direction is same clockwise, and the knuckle angle is α.

If folding face deflection plate central angle summit is A, the intersection point of two fan-shaped straight flanges and circular arc is respectively B, C, the intersection point of two broken line b.c and AB, AC is respectively D, E, be respectively F, G with the intersection point of arc BC, the angular bisector of folding face deflection plate central angle is a, BC should satisfy a//b//c perpendicular to a between the a.b.c; The crooked place of folding face deflection plate both sides knuckle determined by the overlap joint degree that technology Calculation goes out, i.e. the position of DF and EG; In the actual production, the overlap joint degree of folding face deflection plate is less than 50%, i.e. DB:AB≤0.5, EC:AC≤0.5, wherein with the overlap joint degree greater than 20% and less than 50% being good, i.e. 0.2≤DB:AB≤0.5,0.2≤EC:AC≤0.5; The angle of knuckle α is identical with the helical angle of spiral baffle heat exchanger.

The above folding face deflection plate is arranged in the tube bank, constitutes helical duct by knuckle position overlap joint between the adjacent two folding face deflection plates.

The angle of the above knuckle α is 7 °～40 °, is good with 12 °～25 °.

Advantage of the present utility model is:

Substitute the plane deflection plate with folding face deflection plate, reach the purpose of blocking quick runner.The spiral folding face baffle heat exchanger tube bank that the utility model provides is compared with the tube bank of helical planes baffle heat exchanger, and manufacturing cost and manufacture difficulty are identical, but overall heat-transfer coefficient but can improve about 10%.

Description of drawings

Fig. 1 is a fan-shaped plan baffle arrangement schematic diagram;

Fig. 2 is the utility model folding face baffle arrangement schematic diagram;

Fig. 3 is spiral folding face baffle heat exchanger Pipe bundle structure schematic diagram;

Fig. 4 a is the utility model folding face deflection plate planar structure expanded view;

Fig. 4 b is the utility model folding face deflection plate planar structure schematic diagram.

The specific embodiment

For existing spiral baffle heat exchanger, shell-side fluid is to flow in the approximate spiral fluted runner of being made up of deflection plate, because fluid is continuous and the heat exchanger tube collision, evokes whirlpool, secondary stream etc., so the flow regime in the shell side is very complicated.But with regard to its overall flow mode, we can think a kind of spiral flow that flows along helicla flute.Doing heat exchanger cold conditions when experiment, see through the outer cover of heat exchanger that lucite is done, can see that the fluid streams gap by being formed by adjacent two deflection plates overlap joint is successively arranged, flow to the other end from an end of heat exchanger, form a quick runner.By 4 deflection plates is that 4 sticks speed passage is arranged in the tube bank formed of a pitch.Runner is equivalent to partial short-circuit to shell-side fluid fast, is unfavorable for heat exchange.

Based on the consideration of the problems referred to above, the utility model is described in detail below in conjunction with accompanying drawing.Spiral baffle heat exchanger that the utility model provides with folding face deflection plate as shown in Figure 2, the heat exchanger tube figure that has assembled folding face deflection plate is as shown in Figure 3.

This spiral baffle heat exchanger is respectively arranged with knuckle with folding face deflection plate both sides, two knuckles are that central symmetry axis is symmetrical with the angular bisector of rolling over face deflection plate central angle, and the wrap direction of two knuckles is same clockwise, two knuckles are α, and the knuckle angle is identical with the helical angle of spiral baffle heat exchanger.The utility model folding face deflection plate figure sees Fig. 2.

The method of folding face deflection plate both sides knuckle bending is described as follows, and sees Fig. 4 a, 4b.In Fig. 4 a, the folding face deflection plate central angle summit before the bending is A, and the intersection point of two fan-shaped straight flanges and circular arc is respectively B.C, the intersection point of two broken line b.c and AB, AC is respectively D.E, the angular bisector of folding face deflection plate central angle is a, and BC should satisfy a//b//c perpendicular to a between the a.b.c; Straight line DB, DF and camber line BF form closed area 1, straight line EC, EG and camber line CG form closed area 2.Along DF and

EG

1,2 two closed area is bent the α angle along same clockwise respectively on our the folding face deflection plate before bending, see Fig. 4 b, made folding face deflection plate both sides knuckle thus.

Simultaneously, DB:AB≤0.5, promptly the overlap joint degree of knuckle is less than 50%; In the production application, 0.2≤DB:AB≤0.5 is good, and promptly the overlap joint degree of knuckle is greater than 20% and less than 50%.In like manner, EC:AC≤0.5, promptly the overlap joint degree of knuckle is less than 50%; , 0.2≤EC:AC≤0.5 is good, promptly the overlap joint degree of knuckle is greater than 20% and less than 50%; The crooked place (being the position of DF and EG) of folding face deflection plate both sides knuckle is specifically determined by the overlap joint degree that technology Calculation goes out.

Folding face deflection plate is installed in the spiral baffle heat exchanger tube bank time, overlap by the knuckle position between the adjacent two folding face deflection plates, four folding face deflection plates constitute a circumference, and by the spiral way arrangement, form airtight helical duct, avoid the problem of partial short-circuit, effectively improved overall heat-transfer coefficient.Above-mentioned folding face deflection plate tube bank has been installed has seen Fig. 3.

Claims

1. a spiral baffle heat exchanger is with folding face deflection plate, and it is characterized in that: described folding face deflection plate both sides are respectively arranged with knuckle; Described two knuckles are that central symmetry axis is symmetrical with the angular bisector of folding face deflection plate central angle, and two knuckles are respectively rotating shaft rotation bending with the broken line, and the rotation wrap direction is same clockwise, and the knuckle angle is α; If folding face deflection plate central angle summit is A, the intersection point of two fan-shaped straight flanges and circular arc is respectively B, C, the intersection point of two broken line b.c and AB, AC is respectively D, E, be respectively F, G with the intersection point of arc BC, the angular bisector of folding face deflection plate central angle is a, BC should satisfy a//b//c perpendicular to a between the a.b.c; The overlap joint degree of described folding face deflection plate is less than 50%, i.e. DB:AB≤0.5, EC:AC≤0.5; The angle of described knuckle α is identical with the helical angle of spiral baffle heat exchanger.

2. spiral baffle heat exchanger according to claim 1 is characterized in that with folding face deflection plate: the overlap joint degree of described folding face deflection plate is greater than 20% and less than 50%, i.e. 0.2≤DB:AB≤0.5,0.2≤EC:AC≤0.5.

3. spiral baffle heat exchanger according to claim 1 and 2 folding face deflection plate, it is characterized in that: described folding face deflection plate is arranged in the tube bank, constitutes helical duct by knuckle position overlap joint between the adjacent two folding face deflection plates.

4. spiral baffle heat exchanger according to claim 3 folding face deflection plate, it is characterized in that: the angle of described knuckle α is 7 °～40 °.

5. spiral baffle heat exchanger according to claim 4 folding face deflection plate, it is characterized in that: the angle of described knuckle α is 12 °～25 °.