CN2072668U - Dish or bow type net bending flow board in column tube heat exchanger - Google Patents

Abstract

The utility model provides a baffle plate for a tube heat exchanger. The baffle plate forms a circular disc or bow shape, and square holes are arranged in the baffle plate. Tubes can be fixed, dead air region is eliminated, and the utilization rate of heat exchanging area is increased by 20 %. The baffle plate is arranged in the tube heat exchanger. In addition, the baffle plate has simple processing and easy installation.

Description

Dish or bow type net bending flow board in column tube heat exchanger

The utility model relates to deflection plate in the tubular heat exchanger that deflection plate in the tubular heat exchanger, particularly heat transferring medium are gas phase.

The structure of tubular heat exchanger or title shell-and-tube heat exchanger is by dress in a garden tube is made up of tube bank and deflection plate that one group of parallel pipe constitutes.It is ring-like that present employed deflection plate has the garden to lack type (bow type), garden dish-type and garden, these several baffle plates all make shell side gas form dead gas area and stagnant area in zone, the top and the bottom of baffle plate, and the forced turbulent district of really playing the heat exchange effect is extremely limited.With bow type deflection plate is example: establishing the deflection plate diameter is D, and baffle(s) spacing is L, and deflection plate bow type height is D/4, the territory, dead gas area between two deflection plates and the zone that remains in a standstill:

V1＝2∫∫∫rdrdθdz （1）

Ω

The rsin θ of following formula integral domain: 0≤Z≤(8L-D)/24+(4L)/(3D)

0≤θ≤2π；0≤r≤ (D)/2

V1=((8L-D) ²)/48; Turbulent region V2=((4L+D))/48 π D ²(2)

Heat exchange area utilization rate: η between two deflection plates=(V2)/(V1+V2)=(4L+D)/(12L) (3)

In parameter substitution (3) formula with present employed tubular heat exchanger, the heat exchange area utilization rate is between 50%～80%.The author once bores part shortcut hole in the dead gas area of bow type deflection plate, but the position that can hole is limited, sees 55 pages of " chemical fertilizer industry " 86 years the 6th phases." heat exchanger designs handbook volume two 15 pages (the bright work of decorative pattern at the end of a poem, article, etc. where there is a small blank space English) and " chemical process design manual " volume two are introduced the cellular type deflection plate for 482 pages, owing to bore fixedly tube bank of hole, garden (the big 2-3 millimeter of garden boring ratio caliber) on the deflection plate, moreover the high temperature heat expansion, the aperture is easily blocked in dirt in the fluid and corrosion.

For addressing the above problem, Chinese patent application GG87209430 proposes flowing of shell-side fluid and changes into fluid causes local turbulence through the cramp bar network parallel mode by deflector type.But make cramp bar network precision height, it is big that wire rod is processed into the grid difficulty, time-consuming consumption material again, and poling method routinely is very difficult, needs to make special mould, production cost height.

The purpose of this utility model is that a kind of traditional deflection plate (garden dish or bow type) easy strong point of processing that both kept will be provided, can reach the deflection plate that the cramp bar grid causes the parallel mode effect of local turbulence again, it can eliminate the dead gas area in the tubular heat exchanger, improves the utilization rate of heat exchanger tube unit are.

The purpose of this utility model is achieved in that garden in the tubular heat exchanger is lacked the type deflection plate under the constant situation of diameter, make garden dish-type grid type or garden into and lack type grid type (the bow profile is long-pending to be reduced to 10～15% by 25%), the deflection plate diameter is than shell internal diameter smaller (3～15 millimeters), and the hole, garden is washed into square hole on the deflection plate.The shell side heat transferring medium flows through from the deflection plate hole, forms the concurrent flow mode of forced turbulent, thereby eliminates the deflection plate territory, dead gas area at position up and down.

The utility model is for only being processed into square hole at original garden dish or the hole, garden on the bow type deflection plate, so simple in structure, easy to process.Square hole in the deflection plate promptly can the stationary pipes bundle, can make gas form forced turbulent with higher flow velocity by hole again.By heat transfer theory as can be known, gas flow rate is directly proportional with Reynolds (Reynold's) criterion, and Reynolds (Reynold's) criterion is directly proportional with rate of heat transfer, and promptly gas can improve rate of heat transfer by hole, has eliminated the deflection plate dead gas area territory of position more than 20% up and down, and this hole is difficult for blocking.General steel, stainless steel, aluminium and other non-ferrous metal and plastics all are applicable to makes this deflection plate.

The concrete structure of utility model is provided by accompanying drawing and following procedure.

Fig. 1 is garden dish grid type, and Fig. 2 is a bow type grid type schematic diagram.

Illustrate according to the deflection plate procedure that the utility model proposes below in conjunction with Fig. 1 or Fig. 2.

This deflection plate comprises deflection plate main body (1), and square hole (2) is arranged in the main body, and it determines the position by position line (3).

Square hole (2) physical dimension is that the heat exchanger tube external diameter adds suitable surplus (0.2～2 millimeter); Square hole (2) number is identical with the tubulation radical; Square hole (2) arrangement mode is consistent with tube bank in the heat exchanger.Only mark part square hole (2) expression among the figure, need all to be processed into square hole (2) in the actual fabrication process.D is the deflection plate diameter among Fig. 1 and Fig. 2, and h is a deflection plate bow type height among Fig. 2.Intersection linear system position line (3) among Fig. 1 and Fig. 2, intersection point is square hole (2) center.

The deflection plate that will process (1) is fixed with the tube sheet in the tubular heat exchanger, and setting-out location on tube sheet with drilling machine boring, is washed into square hole (2) with deflection plate Zhong Yuan hole with punch press again.

Claims (3)

1, garden dish or bow type grid type deflection plate in a kind of tubular heat exchanger, it is characterized in that: this deflection plate is garden dish or bow type (1), and the fixing tube bank of square hole (2) is arranged on (1).

2, deflection plate according to claim 1 is characterized in that the fixing tube bank of square hole (2) and as tubular heat exchanger shell-side fluid medium channel.

3, deflection plate according to claim 1 is characterized in that the physical dimension of square hole adds 0.2～2 millimeter for the heat exchanger tube external diameter.