Shell-and-tube heat exchanger for lithium bromide refrigerating system

Abstract

The utility model provides a shell-and-tube heat exchanger for a lithium bromide refrigerating system. The shell-and-tube heat exchanger comprises a shell, a tube box is arranged at one end of the shell, a floating head is arranged at the other end of the shell, a heat exchange tube bundle is arranged in the shell, lithium bromide solution flows in a tube pass, high-temperature water flows in a shell pass, and a floating ball flowing along with liquid is arranged in the tube pass of the shell-and-tube heat exchanger. The heat exchanger can clean the tube pass through the floating ball, so that the heat exchanger can keep higher heat exchange efficiency for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium bromide refrigeration systems, in particular to a shell and tube heat exchanger used in lithium bromide refrigeration systems. Background Art

[0002] For factories with large amounts of recoverable waste heat, lithium bromide absorption refrigeration systems have high economic and environmental value. They can use waste heat to provide district cooling, as well as batch ice making and liquid nitrogen production.

[0003] However, lithium bromide solution is corrosive to materials such as copper and steel. The copper that is chemically replaced will agglomerate into particles and precipitate in the pipe section with slow flow, causing blockage. In the lithium bromide refrigeration system, the lithium bromide solution absorbs waste heat through the heat exchanger, which is mostly a shell and tube heat exchanger or a plate heat exchanger. The heat exchange conditions of the lithium bromide refrigeration system are characterized by high temperature, high pressure, and strong corrosiveness. The sealing rubber ring of the plate heat exchanger is prone to aging, and the precipitated copper chips are not easy to discharge, so leakage, blockage and other problems are prone to occur. Although ordinary shell and tube heat exchangers rarely have leakage problems, they are still easy to clog the pipe, resulting in a gradual decrease in heat exchange efficiency. Utility Model Content

[0004] In view of the defects of the background technology, the utility model proposes a shell and tube heat exchanger for a lithium bromide refrigeration system. The heat exchanger can clean the tube side through a float ball, so that the heat exchanger can maintain a high heat exchange efficiency for a long time.

[0005] The utility model proposes a shell and tube heat exchanger for a lithium bromide refrigeration system, comprising a shell, one end of the shell is provided with a tube box, the other end is provided with a floating head, a heat exchange tube bundle is provided inside, a lithium bromide solution flows in the tube side, high-temperature water flows in the shell side, and a floating ball flowing with the liquid is provided in the tube side of the shell and tube heat exchanger.

[0006] Preferably, the shell and tube heat exchanger is further provided with a float recovery device;

[0007] The pipe box is divided into an inlet box and an outlet box at the top and bottom. The top of the inlet box is connected to a lithium bromide input pipe, and the bottom of the outlet box is connected to a lithium bromide output pipe. The float ball recovery device is arranged in the pipe mouth of the lithium bromide output pipe, and the bottom of the float ball recovery device is connected to the lithium bromide input pipe through a float ball delivery pipe.

[0008] The float ball delivery pipe is provided with a float ball discharge port.

[0009] Preferably, the float ball recoverer is a mesh funnel, the top of the ball-ball section of the float ball delivery pipe is connected to the funnel mouth at the bottom of the mesh funnel, and the ball-ball section is located in the lithium bromide output pipe.

[0010] Preferably, the shell and tube heat exchanger is further provided with a float propeller, and the float propeller is connected in series to the float delivery pipe.

[0011] Preferably, the float propeller comprises a propeller housing and a spiral rotor rotatably disposed in the propeller housing, and spiral blades are disposed on the circumference of the spiral rotor. As the spiral rotor rotates, the float advances in a spiral in the gaps between the spiral blades.

[0012] Preferably, the float delivery pipe further includes a first heat exchange section;

[0013] A high-temperature water input pipe is connected to the top of the shell near the pipe box, and a high-temperature water output pipe is connected to the bottom of the shell near the floating head;

[0014] The first heat exchange section is coaxially arranged in the high-temperature water output pipe.

[0015] Preferably, the float delivery pipe further includes a second heat exchange section, and the second heat exchange section is coaxially arranged in the high-temperature water input pipe.

[0016] Preferably, the heat exchange tube bundle is a straight tube, the inner circumference of the straight tube is provided with a ceramic layer, and the outer circumference is provided with spiral fins.

[0017] Preferably, the float is provided with an axial hole, and a cylindrical hollow shaft is sleeved in the axial hole.

[0018] Preferably, the peripheral surface of the float is composed of a plurality of petals.

[0019] The beneficial effects of the utility model include: the shell and tube heat exchanger cleans the tube side through the float ball, so that the heat exchanger maintains a high heat exchange efficiency for a long time; the recovered float ball absorbs the heat of the high-temperature water in the first heat exchange section and the second heat exchange section of the float ball conveying pipe, and then directly contacts with the lithium bromide solution for heat exchange after entering the tube box and the tube side, so that the heat exchange efficiency of the shell and tube heat exchanger is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is described in detail below with reference to the embodiments and drawings, wherein:

[0021] Figure 1 The utility model is a three-dimensional schematic diagram of a shell and tube heat exchanger used in a lithium bromide refrigeration system.

[0022] Figure 2 The utility model is a cross-sectional schematic diagram of a shell and tube heat exchanger used in a lithium bromide refrigeration system.

[0023] Figure 3 It is a structural diagram of a float of the utility model.

[0024] Figure 4 It is a cross-sectional view of the heat exchange tube bundle of the utility model.

[0025] Reference numerals:

[0026] 1-shell, 11-high-temperature water input pipe, 12-high-temperature water output pipe, 2-pipe box, 21-water inlet box, 22-water outlet box, 23-lithium bromide input pipe, 24-lithium bromide output pipe, 3-floating head, 4-heat exchange tube bundle, 41-ceramic layer, 42-spiral fin, 5-float, 51-petal, 52-hollow shaft, 6-sealing plate, 7-baffle, 8-float delivery pipe, 81-float recovery device, 82-float outlet, 83-float propeller, 831-spiral rotor, 84-goal section, 85-first heat exchange section, 86-second heat exchange section. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0029] The principle of the present utility model is described in detail below with reference to the accompanying drawings and embodiments.

[0030] A shell and tube heat exchanger for a lithium bromide refrigeration system, such as Figure 1-2 As shown, the shell and tube heat exchanger includes a shell 1, a tube box 2 is provided at one end of the shell 1, a floating head 3 is provided at the other end, and a heat exchange tube bundle 4 is provided inside. A floating ball 5 that flows with the liquid is provided in the tube side of the shell and tube heat exchanger. A sealing plate 6 is provided between the shell 1 and the tube box 2, and between the shell 1 and the floating head 3. A baffle 7 is provided in the shell side. The lithium bromide solution flows in the tube side, and the high-temperature water rotates and flows in the shell side. The floating ball 5 is used to clean the tube side, so that the heat exchanger maintains a high heat exchange efficiency for a long time.

[0031] like Figure 3As shown, the circumference of the float 5 is composed of a plurality of petals 51, and an axial hole is provided in the middle of the float 5, and a cylindrical hollow shaft 52 is sleeved in the axial hole. When the petals 51 collide with the inner wall of the heat exchange tube bundle 4, the copper chips attached to the inner wall can be scraped off, and some copper chips will hide in the gaps between the petals 51. It is easier to take out the float 5 for cleaning regularly than to disassemble the shell and tube heat exchanger to clean the tube. The float 5 with petals 51 will be lighter than a sphere of the same diameter and material, and the hollow shaft 52 will also increase the buoyancy of the float 5, so that the overall specific gravity of the float 5 is slightly lighter than water, it will not sink to the bottom, and it is easy to flow with the lithium bromide solution.

[0032] In this embodiment, the shell and tube heat exchanger is further provided with a float recovery device 81. The tube box 2 is divided into an inlet box 21 and an outlet box 2 from top to bottom. The top of the inlet box 21 is connected to a lithium bromide input pipe 23, and the bottom of the outlet box 2 is connected to a lithium bromide output pipe 24. The float recovery device 81 is arranged in the pipe mouth of the lithium bromide output pipe 24, and the bottom of the float recovery device 81 is connected to the lithium bromide input pipe 23 through the float delivery pipe 8. Through the float recovery device 81, the float 5 will circulate in the pipe and the float delivery pipe 8. The float delivery pipe 8 is provided with a float discharge port 82. The float 5 can be taken out or put in by opening the float discharge port 82, so that the float 5 can be easily cleaned and replaced.

[0033] The ball float collector 81 is a mesh funnel, and the top of the ball float section 84 of the ball float delivery pipe 8 is connected to the funnel mouth at the bottom of the mesh funnel, and the ball float section 84 is located in the lithium bromide output pipe 24. The shell and tube heat exchanger is also provided with a ball float propeller 83, and the ball float propeller 83 is connected in series to the ball float delivery pipe 8. The ball float 5 is separated from the lithium bromide solution when passing through the ball float collector 81. The lithium bromide solution flows along the lithium bromide output pipe 24 after passing through the ball float collector 81, and the ball float 5 enters the ball float delivery pipe 8, enters the ball float propeller 83 under the action of gravity, and is then pushed forward by the ball float propeller 83. The ball floats 5 entering the ball float delivery pipe 8 will be closely lined up in front and back, and the ball float propeller 83 will push the entire row of ball floats 5 forward.

[0034] The float propeller 83 includes a propeller housing and a spiral rotor 831 rotatably disposed in the propeller housing. Spiral blades are disposed on the circumference of the spiral rotor 831. As the spiral rotor 831 rotates, the float 5 spirally moves forward in the gaps between the spiral blades.

[0035] In this embodiment, the float delivery pipe 8 further includes a first heat exchange section 85 and a second heat exchange section 86. A high-temperature water input pipe 11 is connected to the top of the side of the shell 1 close to the pipe box 2, and a high-temperature water output pipe 12 is connected to the bottom of the side of the shell 1 close to the floating head 3. The first heat exchange section 85 is coaxially arranged in the high-temperature water output pipe 12, and the second heat exchange section 86 is coaxially arranged in the high-temperature water input pipe 11. The recovered float 5 absorbs the heat of the high-temperature water in the first heat exchange section 85 and the second heat exchange section 86 of the float delivery pipe 8, and then directly contacts and exchanges heat with the lithium bromide solution after entering the pipe box 2 and the tube pass, so that the heat exchange efficiency of the shell and tube heat exchanger is further improved.

[0036] In this embodiment, the heat exchange tube bundle 4 is a straight tube, which is easier to disassemble and clean than a bent tube. Figure 4 As shown, a ceramic layer 41 is attached to the inner circumference of the straight tube to prevent oxidation, and a spiral fin 42 is provided on the outer circumference to increase the heat exchange area.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A shell and tube heat exchanger for a lithium bromide refrigeration system, characterized in that: The shell comprises a shell, one end of which is provided with a pipe box, the other end of which is provided with a floating head, and a heat exchange tube bundle is provided inside. Lithium bromide solution flows in the tube side, and high-temperature water flows in the shell side. A floating ball flowing with the liquid is provided in the tube side of the shell and tube heat exchanger.

2. The shell and tube heat exchanger for lithium bromide refrigeration system according to claim 1, characterized in that: The shell and tube heat exchanger is also provided with a float recovery device; The pipe box is divided into a water inlet box and a water outlet box at the top and bottom. The top of the water inlet box is connected to a lithium bromide input pipe, and the bottom of the water outlet box is connected to a lithium bromide output pipe. The float ball recovery device is arranged in the pipe mouth of the lithium bromide output pipe, and the bottom of the float ball recovery device is connected to the lithium bromide input pipe through a float ball delivery pipe. The float ball delivery pipe is provided with a float ball discharge port.

3. The shell and tube heat exchanger for lithium bromide refrigeration system according to claim 2, characterized in that: The float ball recoverer is a mesh funnel, the top of the ball section of the float ball delivery pipe is connected to the funnel mouth at the bottom of the mesh funnel, and the ball section is located in the lithium bromide output pipe.

4. The shell and tube heat exchanger for lithium bromide refrigeration system according to claim 3, characterized in that: The shell and tube heat exchanger is also provided with a float propeller, and the float propeller is connected in series to the float delivery pipe.

5. The shell and tube heat exchanger for lithium bromide refrigeration system according to claim 4, characterized in that: The float propeller comprises a propeller housing and a spiral rotor rotatably arranged in the propeller housing. The spiral rotor is provided with spiral blades on the circumference. As the spiral rotor rotates, the float advances spirally in the gaps between the spiral blades.

6. The shell and tube heat exchanger for lithium bromide refrigeration system according to claim 5, characterized in that: The float ball delivery pipe also includes a first heat exchange section; A high-temperature water input pipe is connected to the top of one side of the shell close to the pipe box, and a high-temperature water output pipe is connected to the bottom of one side of the shell close to the floating head; The first heat exchange section is coaxially arranged in the high-temperature water output pipe.

7. The shell and tube heat exchanger for lithium bromide refrigeration system according to claim 6, characterized in that: The float delivery pipe also includes a second heat exchange section, which is coaxially arranged in the high-temperature water input pipe.

8. The shell and tube heat exchanger for lithium bromide refrigeration system according to claim 7, characterized in that: The heat exchange tube bundle is a straight tube, the inner peripheral surface of the straight tube is attached with a ceramic layer, and the outer peripheral surface is provided with spiral fins.

9. The shell and tube heat exchanger for lithium bromide refrigeration system according to claim 1, characterized in that: The float is provided with an axial hole, and a columnar hollow shaft is sleeved in the axial hole.

10. The shell and tube heat exchanger for lithium bromide refrigeration system according to claim 9, characterized in that: The peripheral surface of the floating ball is composed of a plurality of petals.

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