CN201852495U - Pipe bundle heat exchanger of dual-surface reinforcing pipe supported by helical baffle plate for residual heat recovery - Google Patents

Abstract

The utility model discloses a double-sided strengthened tube bundle heat exchanger supported by spiral baffles for waste heat recovery, comprising a head, a shell, a spiral baffle, a heat transfer tube, a fixed-distance tube, and a tube plate. There are spiral baffles, heat transfer tubes and spacer tubes between them, and the spiral baffles are fixed by the spacer tubes; the heat transfer tubes are double-sided strengthened tubes, and three-dimensional fins are arranged on the outer surface of the tube wall. There are three-dimensional ribs on the inner surface of the wall; the fixed distance tube and the heat transfer tube pass through the spiral baffle, and are supported by the spiral baffle, and the two ends are respectively connected with the tube sheet; The outlet of water and the inlet of process cold water are provided with the inlet of high-temperature waste heat waste water and the outlet of low-temperature waste heat waste water after heat exchange on the shell. The heat exchanger of the utility model has the advantages of uniform fluid flow, low pressure drop, no dead zone, no fouling, high heat transfer coefficient and low flow resistance, and can realize high-efficiency recovery and utilization of waste heat.

Description

A double-sided strengthened tube bundle heat exchanger supported by spiral baffles for waste heat recovery

technical field

The utility model patent relates to the field of heat exchangers, in particular to a double-sided reinforced tube bundle heat exchanger supported by spiral baffles for waste heat recovery.

Background technique

Waste heat is excess and wasted energy that is not utilized in energy utilization equipment during a certain thermal process. It mainly includes seven kinds of high-temperature exhaust gas waste heat, cooling medium waste heat, waste steam and wastewater waste heat, high-temperature product and slag waste heat, chemical reaction waste heat, combustible waste gas waste liquid and waste heat, and high-pressure fluid waste heat. The total waste heat resources of various industries account for about 17% to 67% of their total fuel consumption, and 60% of the waste heat resources can be recycled. With the urgent need for energy saving and the need for enterprises to reduce costs and improve product competitiveness, waste heat recovery and utilization are increasingly valued. At present, in key energy-consuming fields such as chemical industry, iron and steel, ceramics, and building materials, the recovery technology of medium and high temperature waste heat above 100 °C has been relatively mature, but the recovery and utilization of low temperature waste heat below 100 °C has not attracted enough attention. For example, in iron and steel enterprises, more than 50% of high-temperature waste heat and more than 40% of medium-temperature waste heat have been recycled, but for low-temperature waste heat below 100°C, the recycling rate is less than 1%. Low-temperature waste heat is often encountered in other industrial and civil fields, mainly process wastewater or equipment cooling water. In addition, industries such as papermaking and food also have a large amount of low-temperature waste heat that needs to be recycled.

The key to the recovery of low-temperature waste heat below 100°C is the high-efficiency heat exchanger. Due to the low temperature of the heat source, the heat exchanger is required to be able to exchange heat at a low temperature difference, and the lower the heat exchange temperature difference, the better the waste heat recovery effect and the greater the energy saving potential. At present, the waste heat recovery heat exchanger with traditional arched partitions supporting smooth tubes is widely used in China. This heat exchanger has the following disadvantages:

1. The fluid between the tubes is baffled back and forth between the baffles to scour the tube bundles. During this process, the fluid body resistance and pressure drop caused by the baffles are large, which may easily cause the vibration damage of the tube bundles;

2. There is a flow dead zone in the bow-shaped partition, and the medium is easy to scale, which affects the performance and service life of the heat exchanger;

3. Smooth tubes are used for heat exchange, and the heat transfer temperature difference is relatively large. To achieve low temperature difference heat exchange, a large heat exchange area is required, which will lead to an increase in cost.

The heat exchanger with spiral shell side structure has the advantages of uniform fluid flow, no dead zone, low pressure drop and is not easy to cause vibration of the tube bundle; and the heat exchanger with spiral baffles as the support structure between the tubes can overcome the bow baffle The inherent disadvantages of plate heat exchangers; the combination of spiral baffles and double-sided reinforced tubes can further improve the heat transfer performance of the heat exchanger, thereby achieving low-temperature differential heat transfer. Therefore, the high-efficiency heat exchanger with double-sided reinforced tubes with spiral baffles is especially suitable for the recovery and utilization of low-temperature waste heat.

Utility model content

The purpose of this utility model is to overcome the shortcomings of the existing baffle heat exchanger, and provide a double-sided reinforced tube bundle heat exchanger supported by a spiral baffle. The heat exchanger has uniform fluid flow, low pressure drop, and no dead zone. , not easy to scale, high heat transfer coefficient, low flow resistance, strong resistance to medium corrosion, etc.

The purpose of this utility model is achieved through the following technical solutions:

A double-sided reinforced tube bundle heat exchanger supported by spiral baffles for waste heat recovery, including a head 1, a shell 3, a spiral baffle 4, a heat transfer tube 5, a distance tube 6, and a tube plate 8. A spiral baffle 4, a heat transfer tube 5 and a distance tube 6 are arranged between the plates 8, and the spiral baffle 4 is fixed by the distance tube 6; the heat transfer tube 5 is a double-sided strengthening tube; the distance tube 6 And the heat transfer tube 5 passes through the spiral baffle 4, and is supported by the spiral baffle 4, and the two ends are respectively connected with the tube sheet 8; the outlet 9 of the process hot water and the outlet 9 of the process cold water are arranged on the head 1 The inlet 10 is provided with an inlet 2 of high-temperature waste heat waste water and an outlet 7 of low-temperature waste heat waste water after heat exchange on the shell 3 .

The double-sided reinforced tube of the utility model is a heat transfer tube with three-dimensional fins on the outer surface of the tube wall and three-dimensional convex ribs on the inner surface of the tube wall.

The metal used for the heat transfer tube 5 of the utility model can be carbon steel, stainless steel, non-ferrous metal and alloy.

The heat transfer tubes 5 described in the utility model form tube bundles according to triangular tube layout, corner triangle tube layout, square tube layout, corner square tube layout or concentric circle tube layout.

The spiral baffle in the utility model is a quarter elliptical plate inclined to the central axis of the heat exchanger, and four elliptical baffles are cross-arranged and spliced into a helical shape along each circumference of the radial direction of the tube bundle. The periphery of the adjacent baffles is a continuous helical line; or it is an overall continuous helical structure, and the center of the tube bundle is provided with a central tube.

The heat exchanger described in the utility model is one of fixed tube plate type, floating head type or U-shaped tube type.

Compared with the prior art, the utility model has the following beneficial effects:

1. The spiral baffle makes the fluid flow evenly in the shell side, showing a continuous and stable spiral plug-like flow, the flow of the fluid is less mixed, and there is no flow dead zone, so the waste heat medium is not easy to scale in the shell side;

2. The influence of the bypass flow and leakage flow of the fluid is small, and the pressure drops, so the vibration damage of the waste heat medium to the tube bundle is small during the flow process;

3. The double-sided enhanced tube is used as the heat transfer tube type. The three-dimensional fins on the outer surface can increase the heat exchange area, and promote the strong turbulence of the waste heat waste water flowing outside the tube, and promote the disturbance and separation of the boundary layer. Thereby improving the convective heat transfer coefficient outside the tube; the three-dimensional convex ribs on the inner surface can also promote the strong turbulence of the process water flowing in the tube, and promote the disturbance and separation of the boundary layer, thereby improving the convective heat transfer coefficient inside the tube; Since the heat transfer coefficient inside and outside the tube is improved, the heat exchanger has a high heat transfer coefficient, thereby realizing low-temperature differential heat transfer;

4. Combining the advantages of spiral baffles and double-sided reinforced tubes, it has high heat transfer coefficient, stable performance, low pressure drop, and is not easy to scale. It is especially suitable for applications in the field of waste heat recovery and utilization.

Description of drawings

Fig. 1 is a structural schematic diagram of a double-sided reinforced tube bundle heat exchanger supported by spiral baffles of the present invention.

Fig. 2 is a structural schematic diagram of splicing quarter elliptical plates into a tube bundle of spiral baffles.

Fig. 3 is a structural schematic diagram of an integral spiral baffle tube bundle provided with a central tube.

Fig. 4 is a schematic structural diagram of a double-sided reinforced tube, and three-dimensional fins are arranged on the outer surface of the tube wall.

Fig. 5 is a cross-sectional view of the inner surface of the double-sided reinforced pipe, and three-dimensional convex ribs are provided on the inner surface of the pipe wall.

Fig. 6 is an equilateral triangle layout diagram of heat transfer tubes.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings, but the embodiments of the utility model are not limited thereto.

As shown in Figure 1: the utility model uses a spiral baffle for waste heat recovery to support a double-sided reinforced tube bundle heat exchanger, including a head 1, a shell 3, a spiral baffle 4, a heat transfer tube 5, and a fixed distance Tube 6, tube plate 8, spiral baffle 4, heat transfer tube 5 and spacer tube 6 are arranged between tube plate 8, and spiral baffle 4 is fixed by spacer tube 6; Described heat transfer tube 5 is Double-sided strengthened tubes; fixed distance tubes 6 and heat transfer tubes 5 pass through the spiral baffle 4, are supported by the spiral baffle 4, and are connected to the tube sheet 8 at both ends; The outlet 9 of hot water and the inlet 10 of process cold water are provided on the shell 3 with the inlet 2 of high-temperature waste heat waste water and the outlet 7 of low-temperature waste heat waste water after heat exchange. Figure 1 shows a fixed tube-sheet heat exchanger.

As shown in Figures 2 and 3: the helical baffle 4 is a quarter elliptical plate 32 inclined to the central axis of the heat exchanger, and four elliptical baffles are cross-arranged and spliced along each circumference of the radial direction of the tube bundle. It is in a spiral shape, and the periphery of each adjacent baffle is a continuous spiral line; or it is an overall continuous spiral structure, and the center of the tube bundle is provided with a central tube 22 .

As shown in Figures 4 and 5: the heat transfer tube 5 is a double-sided reinforced tube, the outer surface of the double-sided reinforced tube is provided with three-dimensional fins, and the inner surface of the tube wall is provided with three-dimensional convex ribs;

The structural parameters of the three-dimensional fins: the height of the fins is 0.8-2.0 mm, the fin distance along the tube circumference is 1.0-1.5 mm, and the fin gap along the tube radial direction is 1.2-1.5 mm; the structure of the three-dimensional ribs Parameters: The rib height along the radial direction of the pipe is 0.6-1.2mm, the rib width along the circumferential direction of the pipe is 1.5-2.5mm, and the rib length along the axial direction of the pipe is 0.8-1.2mm;

The materials used are carbon steel, stainless steel, non-ferrous metal or alloy.

As shown in accompanying drawing 6: the heat transfer tubes 5 can be arranged in an equilateral triangle.

Claims (5)

1. a waste heat recovery is supported two-sided strengthened pipe pipe bundle heat exchanger with helical baffles, comprise end socket (1), housing (3), helical baffles (4), heat-transfer pipe (5), distance sink tube (6), tube sheet (8), it is characterized in that, be provided with helical baffles (4), heat-transfer pipe (5) and distance sink tube (6) between tube sheet (8), helical baffles (4) is fixing by distance sink tube (6); Described heat-transfer pipe (5) is two-sided strengthened pipe; Distance sink tube (6) and heat-transfer pipe (5) pass helical baffles (4), adopt helical baffles (4) to support, and two ends are connected respectively with tube sheet (8); On end socket (1), be provided with the outlet (9) of technology hot water and the import (10) of technology cold water, the outlet (7) of low temperature exhaust heat waste water after import (2) that is provided with high-temperature residual heat waste water on the housing (3) and heat exchange.

2. waste heat recovery according to claim 1 is supported two-sided strengthened pipe pipe bundle heat exchanger with helical baffles, it is characterized in that, described two-sided strengthened pipe is that outer surface of tube wall is provided with three-dimension fin, and inner surface of tube wall is provided with the heat-transfer pipe of three-dimensional fin.

3. waste heat recovery according to claim 1 is supported two-sided strengthened pipe pipe bundle heat exchanger with helical baffles, it is characterized in that, the material of described heat-transfer pipe (5) is carbon steel, stainless steel, non-ferrous metal or alloy.

4. waste heat recovery according to claim 1 is supported two-sided strengthened pipe pipe bundle heat exchanger with helical baffles, it is characterized in that described heat-transfer pipe (5) is pressed triangle stringing, corner triangle stringing, square stringing, corner square stringing or concentric circles stringing and formed tube bank.

5. waste heat recovery according to claim 4 is supported two-sided strengthened pipe pipe bundle heat exchanger with helical baffles, it is characterized in that, described helical baffles is by 1/4th ellipses that tilt with the heat exchanger central axis, radially each circumference is with four oval deflection plate cross arrangements and be spliced into helical form along tube bank, and each adjacent baffle periphery is the continuous helical line; Or be whole continuous helical structure, and the center of tube bank is provided with central tube.

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