Tubular heat exchanger capable of improving heat exchange efficiency

Abstract

The tube type heat exchanger comprises a main barrel, a first tube box, a second tube box and heat exchange tubes, liquid enters the first tube box from a circulating liquid inlet tube and flows into the second tube box through the heat exchange tubes, live steam enters the main barrel from a live steam inlet tube, heat transfer is conducted between the steam and the liquid through the heat exchange tubes, and heat exchange efficiency is improved. A flow guide cone is arranged in the first pipe box, the vertex of the flow guide cone is located in the circulating liquid inlet pipe, when the circulating liquid vertically enters the first pipe box from the circulating liquid inlet pipe, the outer wall of the flow guide cone is directly impacted, the conical structure of the flow guide cone guides the fluid to be diffused in the circumferential direction of the outer wall of the flow guide cone, and stable rotational flow is formed; the fluid is changed from disordered flowing of impacting the wall of the tube box into spiral flowing, the fluid enters the heat exchange tube at the tangential speed of spiral rotation, the initial speed of the fluid entering the heat exchange tube is increased, thermal resistance is reduced, the thickness of a thermal boundary layer is reduced, and the convection heat exchange efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat exchanger technical field especially relates to a column pipe type heat exchanger that can improve heat exchange efficiency. BACKGROUND

[0002] The existing column pipe type heat exchanger usually includes the main cylinder body that sets up horizontally, and the left and right sides are connected with the first tube box and the second tube box through the first tube plate and the second tube plate respectively, and the heat exchange tube bundle is along the main cylinder body axial and is arranged between the two tube plates. After the circulating liquid is vertically injected into the tube box from the circulating liquid inlet pipe on the upper end of the first tube box, it directly impacts the side wall or the bottom of the tube box, and then is dispersed into each heat exchange tube through the baffling effect, and the fluid inlet direction is perpendicular to the axial direction of the heat exchange tube. The basic flow rate of the circulating liquid into the heat exchange tube is reduced after the circulating liquid impacts the tube box wall, the thermal resistance increases, the heat transfer boundary layer thickens, and the heat exchange efficiency is low.

[0003] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model discloses a column pipe type heat exchanger that can improve heat exchange efficiency to solve the problem that the basic flow rate of the circulating liquid into the heat exchange tube is reduced after the circulating liquid impacts the tube box wall, the thermal resistance increases, the heat transfer boundary layer thickens, and the heat exchange efficiency is low.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A column pipe type heat exchanger that can improve heat exchange efficiency, characterized by comprising:

[0007] The main cylinder body is arranged horizontally, and the left and right sides of the main cylinder body are respectively provided with the first tube plate and the second tube plate; the upper end of the right side of the main cylinder body is provided with a live steam inlet pipe, the lower end of the left side of the main cylinder body is provided with a first distilled water outlet pipe, and the upper end of the left side of the main cylinder body is provided with a first non-condensed steam outlet pipe;

[0008] The first tube box is connected to the left side of the first tube plate, and the upper and lower ends of the first tube box are respectively provided with a circulating liquid inlet pipe and a circulating liquid outlet pipe; a flow guide cone is arranged in the first tube box, the flow guide cone is arranged vertically, and the apex of the flow guide cone is located in the circulating liquid inlet pipe;

[0009] The second tube box is connected to the right side of the second tube plate;

[0010] The heat exchange tube has a plurality of heat exchange tubes, and the plurality of heat exchange tubes are arranged along the axial direction of the main cylinder body, and the left and right sides of the heat exchange tube are respectively connected to the first tube plate and the second tube plate and are communicated with the first tube box and the second tube box.

[0011] Further, the surface of the flow guide cone is provided with a threaded flow guide groove, which is spirally upward from the bottom end of the outer wall of the flow guide cone to the vertex of the flow guide cone.

[0012] Further, the first tube box is axially provided with a split range baffle along the main cylinder, and the first tube box is divided into a first cavity and a second cavity; the second tube box is a third cavity; and the flow guide cone is arranged at the upper end of the split range baffle.

[0013] Further, the main cylinder is provided with a plurality of baffle plates, which are in a semicircular structure and are uniformly and staggered arranged from right to left along the upper and lower sides of the main cylinder.

[0014] Further, the lower end of the right side of the main cylinder is provided with a second distilled water outlet pipe, and the upper end of the right side of the main cylinder is provided with a second non-condensed steam outlet pipe.

[0015] Further, the main cylinder comprises a first cylinder section, a second cylinder section and a third cylinder section; the first tube plate is arranged on the left side of the first cylinder section; the second cylinder section is coaxially connected to the right side of the first cylinder section; the second cylinder section is a half-wave corrugated expansion joint; the outer diameter of the second cylinder section is greater than that of the first cylinder section; the third cylinder section is arranged on the right side of the second cylinder section; the outer diameter of the third cylinder section is equal to that of the first cylinder section; and the second tube plate is arranged on the right side of the third cylinder section.

[0016] Further, the lower end of the second cylinder section is provided with a distilled water tank balance pipe, and the front end of the second cylinder section is provided with a secondary steam inlet pipe.

[0017] Further, the right side of the second tube box is provided with a sight glass.

[0018] The beneficial effects of the embodiments of the utility model are as follows:

[0019] (I) A shell-and-tube heat exchanger capable of improving heat exchange efficiency comprises a main cylinder, a first tube box, a second tube box and heat exchange tubes. Liquid enters the first tube box from a circulating liquid inlet pipe, flows to the second tube box through the heat exchange tubes, and live steam enters the main cylinder from a live steam inlet pipe. The steam and the liquid exchange heat through the heat exchange tubes to heat the liquid in the heat exchange tubes. A flow guide cone is arranged in the first tube box, and the vertex of the flow guide cone is located inside the circulating liquid inlet pipe. When the circulating liquid vertically enters the first tube box from the circulating liquid inlet pipe, it directly impacts the outer wall of the flow guide cone. The conical structure of the flow guide cone guides the fluid to spread along the outer wall in the circumferential direction, forms stable rotational flow, and changes the disordered flow of the fluid impacting the tube box wall into spiral flow. The fluid enters the heat exchange tubes at a tangential speed of spiral rotation, accelerates the initial speed of the fluid entering the heat exchange tubes, reduces the thermal resistance, thins the thermal boundary layer, and improves the efficiency of convective heat exchange.

[0020] (II) Further, the surface of the flow guide cone is provided with a threaded flow guide groove. The threaded flow guide groove arranged on the surface of the flow guide cone guides the fluid to rotate in a predetermined direction through the spiral groove structure, converts the kinetic energy of the vertically impacting fluid into the circumferential rotational flow energy, enhances the tangential velocity component of the fluid, reduces the vortex energy loss generated by the collision of the fluid and the conical surface through the continuous guiding action of the threaded groove, suppresses the non-uniformity of the flow velocity distribution, and improves the turbulence intensity and the heat transfer efficiency.

[0021] (III) Further, a distance separating plate is arranged in the first tube box along the axis of the main cylinder, and the first tube box is divided into a first cavity and a second cavity by the distance separating plate. The second tube box is a third cavity. The flow guide cone is arranged at the upper end of the distance separating plate. The distance separating plate divides the first tube box into the first cavity and the second cavity which are independent of each other. The forced circulation liquid enters the heat exchange tube bundle from the lower side of the second cavity, returns to the upper side of the first cavity, forms a U-shaped multi-pass flow channel, and prolongs the effective flow process of the fluid in the tube box and improves the uniformity of the flow velocity. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is an internal structure schematic view of the shell-and-tube heat exchanger capable of improving heat exchange efficiency.

[0023] Figure 2 It is a front view structure schematic view of the flow guide cone in the shell-and-tube heat exchanger capable of improving heat exchange efficiency.

[0024] Figure 3 It is a side view structure schematic view of the baffle in the shell-and-tube heat exchanger capable of improving heat exchange efficiency.

[0025] Figure 4 It is a side view structure schematic view of the shell-and-tube heat exchanger capable of improving heat exchange efficiency.

[0026] In the drawings:

[0027] 100, main cylinder; 110, first cylinder segment; 120, second cylinder segment; 130, third cylinder segment; 101, first tube plate; 102, second tube plate; 103, live steam inlet pipe; 104, first distilled water outlet pipe; 105, first non-condensed steam outlet pipe; 106, second distilled water outlet pipe; 107, second non-condensed steam outlet pipe; 108, distilled water tank balance pipe; 109, secondary steam inlet pipe; 200, first tube box; 201, circulating liquid inlet pipe; 202, circulating liquid outlet pipe; 203, split-range partition plate; 204, first cavity; 205, second cavity; 300, second tube box; 301, third cavity; 302, sight glass; 400, heat exchange pipe; 500, flow guide cone; 501, threaded flow guide groove; 600, baffle. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application will be described below with reference to the accompanying drawings.

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear, the device of the present application will be described in further detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present application will be more clear according to the following description. It should be noted that the drawings are very simplified and all use non-precise proportions, only to facilitate, clear and assist the purpose of describing the embodiments of the present application. In order to make the purpose, features and advantages of the present application more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size and the like shown in the drawings of the present application are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the conditions of the implementation of the present application, so they do not have the technical essence, any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose of the present application, should still fall within the scope of the technical content disclosed by the present application.

[0030] Embodiment:

[0031] A column tube type heat exchanger capable of improving heat exchange efficiency includes a main cylinder 100, a first tube box 200, a second tube box 300 and a heat exchange pipe 400.

[0032] Figure 1 The internal structure of the column tube type heat exchanger capable of improving heat exchange efficiency of the present application is shown in the figure. Figure 1As shown, the main cylinder 100 is horizontally arranged, and the first tube plate 101 and the second tube plate 102 are arranged on the left and right sides of the main cylinder 100 respectively. The main cylinder 100 includes the first cylinder section 110, the second cylinder section 120 and the third cylinder section 130. The first tube plate 101 is arranged on the left side of the first cylinder section 110, the second cylinder section 120 is coaxially connected to the right side of the first cylinder section 110, the second cylinder section 120 is a half-wave expansion joint, the outer diameter of the second cylinder section 120 is greater than that of the first cylinder section 110, the third cylinder section 130 is arranged on the right side of the second cylinder section 120, the outer diameter of the third cylinder section 130 is equal to that of the first cylinder section 110, and the second tube plate 102 is arranged on the right side of the third cylinder section 130. The upper end of the right side of the main cylinder 100 is provided with a live steam inlet pipe 103, the lower end of the left side of the main cylinder 100 is provided with a first distilled water outlet pipe 104, and the upper end of the left side of the main cylinder 100 is provided with a first non-condensable steam outlet pipe 105. The lower end of the right side of the main cylinder 100 is provided with a second distilled water outlet pipe 106, and the upper end of the right side of the main cylinder 100 is provided with a second non-condensable steam outlet pipe 107.

[0033] Figure 2 It is a front view structural schematic diagram of a flow guide cone in a column tube type heat exchanger capable of improving heat exchange efficiency. Figures 1-2 As shown, the first tube box 200 is connected to the left side of the first tube plate 101, and the upper and lower ends of the first tube box 200 are respectively provided with a circulating liquid inlet pipe 201 and a circulating liquid outlet pipe 202. The flow guide cone 500 is arranged in the first tube box 200, and the flow guide cone 500 is vertically arranged, and the vertex of the flow guide cone 500 is located in the circulating liquid inlet pipe 201. The second tube box 300 is connected to the right side of the second tube plate 102.

[0034] As shown, Figure 1 The heat exchange pipe 400 has a plurality of heat exchange pipes 400, and the plurality of heat exchange pipes 400 are arranged in the axial direction of the main cylinder 100, and the left and right sides of the heat exchange pipe 400 are connected to the first tube plate 101 and the second tube plate 102 and communicate with the first tube box 200 and the second tube box 300.

[0035] As shown, Figure 2 Further, the surface of the flow guide cone 500 is provided with a threaded flow guide groove 501, and the threaded flow guide groove 501 is spirally arranged upward from the outer wall bottom end of the flow guide cone 500 to the vertex of the flow guide cone 500. The threaded flow guide groove 501 arranged on the surface of the flow guide cone 500 guides the fluid to rotate in a predetermined direction through the spiral groove structure, converts the vertical impact kinetic energy of the fluid into circumferential rotational flow kinetic energy, enhances the tangential velocity component of the fluid, reduces the vortex energy loss generated by the collision of the fluid and the cone surface through the continuous guiding action of the threaded groove, suppresses the non-uniformity of the flow velocity distribution, and improves the turbulence intensity and the heat transfer efficiency.

[0036] As shown, Figure 1As shown, further, a partition plate 203 is arranged along the axial direction of the main cylinder 100 inside the first tube box 200, dividing the interior of the first tube box 200 into a first cavity 204 and a second cavity 205. The interior of the second tube box 300 is a third cavity 301. A guide cone 500 is located at the upper end of the partition plate 203. The partition plate 203 divides the first tube box 200 into the upper and lower independent first cavities 204 and second cavities 205. The forced circulating liquid enters the heat exchange tube bundle from the lower side of the second cavity 205 and then flows back to the upper side of the first cavity 204 to flow out, forming a U-shaped multi-pass flow channel, which prolongs the effective flow path of the fluid in the tube box and improves the uniformity of the flow rate.

[0037] Figure 3 This is a side view of the baffle plate structure in a shell-and-tube heat exchanger that can improve heat exchange efficiency according to this utility model. Figure 1 and Figure 3 As shown, furthermore, the main cylinder 100 is provided with several baffles 600, which are semi-circular in shape and are evenly and alternately arranged from right to left along the upper and lower sides of the main cylinder 100. The semi-circular baffles 600 arranged alternately along the upper and lower sides of the main cylinder 100 force the shell-side fluid to repeatedly change its flow direction when flowing through the heat exchange tube bundle 400, forming a composite flow field combining longitudinal serpentine path and transverse flow around, increasing the fluid disturbance frequency and prolonging the contact time. At the same time, the flow velocity is locally increased at the gaps of the baffles 600, which destroys the outer boundary layer of the tube and enhances turbulent mixing, thereby improving the shell-side heat transfer efficiency.

[0038] like Figure 1 As shown, the lower end of the second cylindrical section 120 is provided with a distilled water tank balance pipe 108, and the front end of the second cylindrical section 120 is provided with a secondary steam inlet pipe 109. The distilled water tank balance pipe 108 at the lower end of the second cylindrical section 120 continuously discharges condensate and balances shell-side pressure fluctuations, preventing water hammer effect and local vacuum formation, and ensuring stable steam flow. At the same time, the secondary steam inlet pipe 109 at the front end replenishes the middle of the main cylinder 100 with external low-pressure steam, which mixes with the main steam to increase the steam flow rate and fill the area of ​​steam density decrease caused by condensation, forming a gradient temperature field distribution and avoiding local overheating or underheating of the heat exchange tube bundle 400.

[0039] Figure 4 This is a side view of a shell-and-tube heat exchanger that improves heat exchange efficiency according to this utility model. Figure 4 As shown, a sight glass 302 is further provided on the right side of the second tube box 300. The fluid flow status in the third chamber 301 can be observed in real time through the sight glass 302, and the blockage of the heat exchange tube 400, abnormal gas-liquid two-phase flow, or leakage fault can be quickly determined, avoiding the cumbersome operation of stopping the machine and disassembling the tube box required by traditional testing.

[0040] In operation, this embodiment is as follows:

[0041] The liquid from the circulating liquid inlet pipe 201 enters the second cavity 205 of the first tube box 200, directly impacts the outer wall of the flow guide cone 500, the flow guide cone 500 guides the fluid to diffuse circumferentially along the outer wall thereof, forms a stable spiral flow, and changes the fluid from the disordered flow vertically impacting the tube box wall into a spiral flow, the liquid with the spiral tangential velocity enters the heat exchange pipe 400 and flows to the third cavity 301, flows to the second cavity 205 of the second tube box 300 through the lower heat exchange pipe 400, the live steam from the live steam inlet pipe 103 enters the main cylinder 100, then the steam is guided to the baffle 600 of the main cylinder 100, the steam and the liquid are heated through the heat exchange pipe 400, and the liquid flows to the first cavity 204 of the first tube box 200 from the upper heat exchange pipe 400 of the second cavity 205 and is discharged from the circulating liquid outlet pipe 202 to the next device.

[0042] In this embodiment, when the circulating liquid vertically enters the first tube box 200 from the circulating liquid inlet pipe 201, directly impacts the outer wall of the flow guide cone 500, the conical structure of the flow guide cone 500 guides the fluid to diffuse circumferentially along the outer wall thereof, forms a stable spiral flow, and changes the fluid from the disordered flow vertically impacting the tube box wall into a spiral flow, the fluid enters the heat exchange pipe 400 with the spiral tangential velocity, accelerates the initial velocity of the fluid entering the heat exchange pipe 400, reduces the thermal resistance, thins the thermal boundary layer thickness, and improves the convective heat transfer efficiency.

[0043] The technical features of the above-described embodiments can be combined in any manner, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0044] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the utility model patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A shell-and-tube heat exchanger capable of improving heat exchange efficiency, characterized by comprising: The utility model relates to a steam generator, which comprises: a main cylinder (100) arranged horizontally, the left and right sides of the main cylinder (100) being respectively provided with a first tube plate (101) and a second tube plate (102); the upper end of the right side of the main cylinder (100) is provided with a live steam inlet pipe (103), the lower end of the left side of the main cylinder (100) is provided with a first distilled water outlet pipe (104), and the upper end of the left side of the main cylinder (100) is provided with a first non-condensable steam outlet pipe (105); a first tube box (200) connected to the left side of the first tube plate (101), the upper and lower ends of the first tube box (200) being respectively provided with a circulating liquid inlet pipe (201) and a circulating liquid outlet pipe (202); the first tube box (200) is provided with a flow guide cone (500) inside, the flow guide cone (500) being arranged vertically, and the vertex of the flow guide cone (500) is located in the circulating liquid inlet pipe (201); a second tube box (300) connected to the right side of the second tube plate (102); a plurality of heat exchange pipes (400) arranged along the axial direction of the main cylinder (100), the left and right sides of the heat exchange pipes (400) being respectively connected to the first tube plate (101) and the second tube plate (102) and communicating the first tube box (200) and the second tube box (300).

2. The tubular heat exchanger with improved heat exchange efficiency according to claim 1, characterized in that: The surface of the flow guide cone (500) is provided with a threaded flow guide groove (501) arranged spirally upward from the bottom end of the outer wall of the flow guide cone (500) to the vertex of the flow guide cone (500).

3. The tubular heat exchanger with improved heat exchange efficiency according to claim 1, characterized in that: The first tube box (200) is provided with a split-range baffle (203) arranged along the axial direction of the main cylinder (100) and separating the inside of the first tube box (200) into a first cavity (204) and a second cavity (205); the inside of the second tube box (300) is a third cavity (301); and the flow guide cone (500) is arranged at the upper end of the split-range baffle (203).

4. The tubular heat exchanger with improved heat exchange efficiency according to claim 1, characterized in that: The main cylinder (100) is provided with a plurality of baffle plates (600), the baffle plates (600) being semicircular in structure, and the plurality of baffle plates (600) being arranged and installed uniformly and alternately along the upper and lower sides of the main cylinder (100) from right to left.

5. The tubular heat exchanger with improved heat exchange efficiency according to claim 1, characterized in that: The lower end of the right side of the main cylinder (100) is provided with a second distilled water outlet pipe (106), and the upper end of the right side of the main cylinder (100) is provided with a second non-condensable steam outlet pipe (107).

6. The tubular heat exchanger with improved heat exchange efficiency according to claim 1, characterized in that: The main cylinder (100) comprises a first cylinder section (110), a second cylinder section (120) and a third cylinder section (130); the first tube plate (101) is arranged on the left side of the first cylinder section (110), the second cylinder section (120) is coaxially connected to the right side of the first cylinder section (110), the second cylinder section (120) is a half-wave expansion joint, the outer diameter of the second cylinder section (120) is greater than that of the first cylinder section (110), the third cylinder section (130) is arranged on the right side of the second cylinder section (120), the outer diameter of the third cylinder section (130) is equal to that of the first cylinder section (110), and the second tube plate (102) is arranged on the right side of the third cylinder section (130).

7. The tubular heat exchanger with improved heat exchange efficiency according to claim 6, characterized in that: The lower end of the second cylinder section (120) is provided with a distilled water tank balance pipe (108), and the front end of the second cylinder section (120) is provided with a secondary steam inlet pipe (109).

8. The tubular heat exchanger with improved heat exchange efficiency according to claim 1, characterized in that: The right side of the second tube box (300) is provided with a sight glass (302).

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