Heat exchanger and heat exchange module

Abstract

The utility model provides a heat exchanger and a heat exchange module, the heat exchanger comprises a shell, end sockets and a tube plate arranged in the shell, the shell is also internally provided with a first tube and a second tube which are sleeved, the two end sockets are respectively provided with a flue gas outlet and a flue gas inlet, and the flue gas outlet is provided with a temperature monitor. The flue gas outlet is communicated with the outlet three-way valve. The shell is further provided with a fluid inlet and a fluid outlet. The heat exchange module comprises a primary flue, a secondary flue, a discharge flue, a recovery flue, a middle flue gas storage tank and the heat exchanger. According to the heat exchanger and the heat exchange module provided by the utility model, high-temperature flue gas still having a heat recovery value is subjected to secondary recovery, so that the heat recovery efficiency of the flue gas is improved, and resource waste is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, in particular to a heat exchanger and a heat exchange module. Background Technique

[0002] China has a complete range of industrial categories, and a large amount of high-temperature flue gas will be generated in various types of industrial production processes. This part of high-temperature flue gas, as waste gas, is no longer used in the production process, but the heat contained in it can be recovered and utilized through some heat exchange equipment. After the heat resources in the high-temperature flue gas are recovered and utilized by the heat exchange equipment, a large amount of resources are saved for industrial production and the production cost is reduced.

[0003] At present, for the equipment capable of recovering the heat of high-temperature flue gas, the heat recovery efficiency is relatively low. After the high-temperature flue gas is subjected to heat recovery by the heat exchange equipment, its discharge temperature is still about 200°C. For industrial production, this temperature is relatively difficult to be recovered and utilized again. Therefore, this part of the flue gas will be directly sent to the chimney for discharge, and the heat in it will be wasted in vain, resulting in resource loss. Content of the Utility Model

[0004] The utility model provides a heat exchanger and a heat exchange module to solve the problems that the existing heat exchange equipment has a low heat recovery efficiency for the heat in high-temperature flue gas, resulting in a high discharge temperature of the flue gas, difficult recovery and utilization of the heat in it, and resource waste.

[0005] In the first aspect, the utility model provides a heat exchanger, which includes a shell. Four tube sheets are arranged in the shell at intervals from bottom to top. There are heads arranged above the uppermost tube sheet and below the lowermost tube sheet. A flue gas outlet and a flue gas inlet are respectively opened on the upper and lower heads. A temperature monitor is installed on the flue gas outlet. The flue gas outlet is communicated with an outlet three-way valve. A plurality of first tubes are installed between the middle two tube sheets, and both ends of each first tube penetrate through the middle two tube sheets. A second tube is coaxially sleeved in each first tube, and both ends of the second tube penetrate through the uppermost and lowermost tube sheets respectively and are communicated with the heads. A fluid inlet and a fluid outlet are also opened on the shell. The fluid inlet is located between the upper two tube sheets, and the fluid outlet is located between the lower two tube sheets.

[0006] Optionally, the flue gas inlet is communicated with an inlet three-way valve.

[0007] Optionally, the inlet three-way valve is a three-way confluence electromagnetic valve, and the outlet three-way valve is a three-way diversion electromagnetic valve. The inlet three-way valve, the outlet three-way valve, and the temperature monitor are respectively electrically connected to a controller.

[0008] Optionally, the outer diameter of the second tube is 1 / 3 - 1 / 2 of the inner diameter of the first tube.

[0009] Optionally, a spiral flow guide vane is installed between the first pipe and the second pipe, and the blade width of the spiral flow guide vane is the same as the width of the annular gap between the first pipe and the second pipe.

[0010] Optionally, four fluid inlets are evenly arranged on the shell in the circumferential direction.

[0011] Optionally, heat insulation materials are filled between the middle two tube sheets inside the shell.

[0012] In a second aspect, the present invention provides a heat exchange module, including a primary flue, a secondary flue, a smoke exhaust flue, a recovery flue, an intermediate flue gas storage tank, and a heat exchanger of any one described in the first aspect above. Two inlets of the inlet three-way valve are respectively communicated with the primary flue and the secondary flue. Two outlets of the outlet three-way valve are respectively communicated with the smoke exhaust flue and the recovery flue. The recovery flue is communicated with the inlet of the intermediate flue gas storage tank, and the outlet of the intermediate flue gas storage tank is communicated with the secondary flue.

[0013] Optionally, the primary flue is also communicated with the intermediate flue gas storage tank, and a control valve is arranged between the primary flue and the intermediate flue gas storage tank.

[0014] The heat exchanger and the heat exchange module provided by the present invention have the following beneficial effects: 1. The temperature of the flue gas discharged from the flue gas outlet can be detected, the low-temperature flue gas is discharged, and the high-temperature flue gas with heat recovery value is recycled for the second time, improving the efficiency of heat recovery from the flue gas and avoiding waste of resources.

[0015] 2. A spiral flow guide vane is installed between the first pipe and the second pipe, increasing the residence time of the fluid to be heated in the shell, lengthening the heat exchange time between the fluid to be heated and the high-temperature flue gas, and thus improving the efficiency of heat recovery from the high-temperature flue gas.

[0016] 3. By communicating the primary flue with the intermediate flue gas storage tank, part of the high-temperature flue gas enters the intermediate flue gas storage tank and is mixed with the flue gas therein to improve the quality of the flue gas in the intermediate flue gas storage tank, thereby improving the heating efficiency of the flue gas for the second recovery to the fluid to be heated. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of a heat exchanger provided by an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of the internal structure of a heat exchanger provided by an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of the installation structure of the first pipe, the second pipe and the spiral guide vane provided by an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of the structure of a heat exchange module provided by an embodiment of the present invention.

[0022] Explanation of reference numerals:

[0023] 1 - housing, 3 - intermediate flue gas storage tank, 11 - tube sheet, 12 - head, 13 - outlet three - way valve, 14 - first pipe, 15 - second pipe, 16 - fluid inlet, 17 - fluid outlet, 18 - inlet three - way valve, 19 - spiral guide vane, 21 - primary flue, 22 - secondary flue, 23 - exhaust flue, 24 - recovery flue, 31 - control valve, 121 - flue gas inlet, 122 - flue gas outlet, 123 - temperature monitor. Detailed implementation manners

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts also belong to the scope of protection of the present invention.

[0025] As Figure 1 and Figure 2 shown, the present invention provides a heat exchanger, including a housing 1. Four tube sheets 11 are arranged at intervals from bottom to top inside the housing 1. Heads 12 are arranged above the uppermost tube sheet 11 and below the lowermost tube sheet 11. A flue gas outlet 122 and a flue gas inlet 121 are respectively opened on the upper and lower heads 12, and a temperature monitor 123 is installed on the flue gas outlet 122. A plurality of first pipes 14 are installed between the middle two tube sheets 11, and both ends of the first pipes 14 penetrate through the middle two tube sheets 11. A second pipe 15 is coaxially sleeved inside each first pipe 14, and both ends of the second pipe 15 penetrate through the uppermost and lowermost tube sheets 11 and are communicated with the heads 12. A fluid inlet 16 and a fluid outlet 17 are also opened on the housing 1. The fluid inlet 16 is located between the upper two tube sheets 11, and the fluid outlet 17 is located between the lower two tube sheets 11. The flue gas outlet 122 is communicated with the outlet three - way valve 13. The flue gas inlet 121 is communicated with the inlet three - way valve 18.

[0026] When the heat exchanger is working, the high-temperature flue gas discharged from the upstream enters the heat exchanger through the flue gas inlet 121, and then enters multiple second tubes 15 through the tube sheet 11 at the bottom. At the same time, the fluid to be heated enters the first tube 14 in the heat exchanger through the fluid inlet 16. The high-temperature flue gas in the second tubes 15 flows upward from bottom to top, and the fluid to be heated in the first tube 14 flows downward from top to bottom. The two fluids flow in a countercurrent manner as a whole. After the fluid to be heated is heated, it flows out from the fluid outlet 17 at the bottom of the heat exchanger and enters the next process, while the flue gas is discharged from the flue gas outlet 122.

[0027] When the flue gas passes through the flue gas outlet 122, its temperature is detected by the temperature monitor 123. When the temperature monitor 123 detects that the temperature of the flue gas drops to the set value, the outlet three-way valve 13 is adjusted manually so that the flue gas is discharged to the outside through the outlet three-way valve 13. When the temperature monitor 123 detects that the temperature of the flue gas does not reach the set value, the outlet three-way valve 13 is adjusted so that the flue gas flows out from the outlet three-way valve 13. The discharged flue gas is transported to the inlet three-way valve 18 and enters the heat exchanger again through the inlet three-way valve 18 to complete the secondary recovery of heat.

[0028] It should be noted that between multiple tube sheets 11 and the housing 1, and at the connections between the tube sheet 11 and the first tube 14 and the second tube 15, sealed connection methods are adopted. In this way, closed spaces are formed between the head 12 and the tube sheet 11 and between the tube sheets 11, and there will be no material exchange between fluids.

[0029] The heat exchanger provided by the present utility model detects the temperature of the flue gas discharged from the flue gas outlet 122, discharges the low-temperature flue gas, and performs secondary recovery on the high-temperature flue gas that still has heat recovery value, improving the efficiency of heat recovery from the flue gas and avoiding waste of resources.

[0030] Furthermore, the inlet three-way valve 18 is a three-way confluence solenoid valve, and the outlet three-way valve 13 is a three-way shunt solenoid valve. The inlet three-way valve 18, the outlet three-way valve 13, and the temperature monitor 123 are all electrically connected to the controller respectively.

[0031] The inlet three-way valve 18, the outlet three-way valve 13, and the temperature monitor 123 are electrically connected to the controller respectively. The flue gas temperature detected by the temperature monitor 123 is fed back to the controller, and the controller controls the opening and closing of the two outlets of the outlet three-way valve 13, thereby controlling the discharge or recovery of the flue gas. Similarly, the controller also controls the opening degrees of the two inlets of the inlet three-way valve 18 so that the recovered flue gas can enter the heat exchanger again for heat recovery. The controller controls the inlet three-way valve 18 and the outlet three-way valve 13, improving the operation accuracy of the device. The controller is not shown in the figure, and those skilled in the art can determine the installation position according to the working conditions and will not be elaborated here.

[0032] As Figure 3 shown, further, the outer diameter of the second tube 15 is 1 / 3 - 1 / 2 of the inner diameter of the first tube 14. Further, a spiral flow guide vane 19 is installed between the first tube 14 and the second tube 15, and the blade width of the spiral flow guide vane 19 is the same as the annular gap width between the first tube 14 and the second tube 15.

[0033] The outer diameter of the second tube 15 is 1 / 3 - 1 / 2 of the inner diameter of the first tube 14, so that there is enough annular gap space between the second tube 15 and the first tube 14, and thus the fluid to be heated can flow smoothly in the first tube 14. A spiral flow guide vane 19 is installed between the first tube 14 and the second tube 15, so that the fluid to be heated rotates downward in the first tube 14, thereby increasing the residence time of the fluid to be heated in the housing 1 and increasing the heat exchange time between the fluid to be heated and the high-temperature flue gas, thus improving the heat recovery efficiency of the high-temperature flue gas.

[0034] Further, four fluid inlets 16 are evenly arranged in the circumferential direction of the housing 1. Further, heat insulation materials are filled between the middle two tube plates 11 inside the housing 1.

[0035] Four fluid inlets 16 are evenly arranged in the circumferential direction of the housing 1, so that the fluid to be heated enters evenly from all around the housing 1, thus ensuring that each second tube 15 can be fully utilized as much as possible. Heat insulation materials are filled between the middle two tube plates 11 inside the housing 1 to reduce the loss of heat from the high-temperature flue gas.

[0036] As shown in Figure 4, the present utility model further provides a heat exchange module, including a primary flue 21, a secondary flue 22, a smoke exhaust flue 23, a recovery flue 24, an intermediate flue gas storage tank 3, and the heat exchanger of the first aspect above. Two inlets of the inlet three-way valve 18 are respectively communicated with the primary flue 21 and the secondary flue 22. Two outlets of the outlet three-way valve 13 are respectively communicated with the smoke exhaust flue 23 and the recovery flue 24. The recovery flue 24 is communicated with the inlet of the intermediate flue gas storage tank 3, and the outlet of the intermediate flue gas storage tank 3 is communicated with the secondary flue 22. Further, the primary flue 21 is also communicated with the intermediate flue gas storage tank 3, and a control valve 31 is arranged between the primary flue 21 and the intermediate flue gas storage tank 3.

[0037] When the heat exchange module provided by the present utility model is working, first, the primary flue 21 sends the high-temperature flue gas from the upstream to the heat exchanger through the inlet three-way valve 18 for heat recovery. The flue gas that has completed the heat exchange work is discharged from the flue gas outlet 122. When the flue gas is discharged from the flue gas outlet 122, it is first detected by the temperature monitor 123. When the temperature of the flue gas drops to the set value, it is sent to the exhaust flue 23 for discharge through the outlet three-way valve 13. When the temperature of the flue gas does not drop to the set value, it is sent to the recovery flue 24 through the outlet three-way valve 13, and the flue gas is transported to the intermediate flue gas storage tank 3 through the recovery flue 24 for collection. The flue gas collected in the intermediate flue gas storage tank 3 can be transported to the heat exchanger again through the secondary flue 22, and then the heat is recovered for the second time.

[0038] At the same time, the primary flue 21 is also connected to the intermediate flue gas storage tank 3, and part of the high-temperature flue gas is sent into the intermediate flue gas storage tank 3 to be mixed with the flue gas in the intermediate flue gas storage tank 3, so as to improve the quality of the flue gas in the intermediate flue gas storage tank 3, thereby improving the heating efficiency of the flue gas to the fluid to be heated.

[0039] The working principle of the present utility model is as follows:

[0040] When the heat exchanger and the heat exchange module are working, first, the primary flue 21 sends the high-temperature flue gas from the upstream to the heat exchanger through the inlet three-way valve 18 for heat recovery. The high-temperature flue gas enters the heat exchanger from the flue gas inlet 121, and then is dispersed into multiple second tubes 15 through the tube sheet 11 at the bottom. At the same time, the fluid to be heated enters the heat exchanger from the fluid inlet 16 around the shell and enters the first tube 14. The high-temperature flue gas in the second tube 15 flows upward, and the fluid to be heated in the first tube 14 flows downward. The two fluids are in a countercurrent flow as a whole. A spiral guide vane 19 is installed between the first tube 14 and the second tube 15, so that the fluid to be heated rotates downward in the first tube 14, thereby increasing the residence time of the fluid to be heated in the shell 1 and increasing the heat exchange time between the fluid to be heated and the high-temperature flue gas, thereby improving the heat recovery efficiency of the high-temperature flue gas. Inside the shell 1, heat insulation materials are filled between the two middle tube sheets 11 to reduce the loss of heat from the high-temperature flue gas.

[0041] After the fluid to be heated is heated, it flows out from the fluid outlet 17 at the bottom of the heat exchanger and enters the next process, while the flue gas is discharged from the flue gas outlet 122 of the heat exchanger.

[0042] When the flue gas is discharged from the flue gas outlet 122, it is first detected by the temperature monitor 123. When the temperature of the flue gas drops to the set value, it is sent to the smoke exhaust duct 23 for discharge through the outlet three-way valve 13. When the temperature of the flue gas does not drop to the set value, it is sent to the recovery flue 24 through the outlet three-way valve 13, and the flue gas is transported to the intermediate flue gas storage tank 3 through the recovery flue 24 for collection. The flue gas collected in the intermediate flue gas storage tank 3 can be transported to the heat exchanger again through the secondary flue 22, and then the heat is recovered for the second time. The inlet three-way valve 18, the outlet three-way valve 13, and the temperature monitor 123 are respectively electrically connected to the controller, and the controller controls the states of the inlet three-way valve 18 and the outlet three-way valve 13.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat exchanger, characterized in that, It includes a housing (1), inside which there are four tube sheets (11) arranged at intervals from bottom to top. There are heads (12) both above the uppermost tube sheet (11) and below the lowermost tube sheet (11). A flue gas outlet (122) and a flue gas inlet (121) are respectively provided on the upper and lower heads (12). A temperature monitor (123) is installed on the flue gas outlet (122); A plurality of first tubes (14) are installed between the two middle tube sheets (11), and both ends of the first tube (14) penetrate through the two middle tube sheets (11); A second tube (15) is coaxially sleeved inside each first tube (14), and both ends of the second tube (15) respectively penetrate through the uppermost and lowermost tube sheets (11) and communicate with the head (12); A fluid inlet (16) and a fluid outlet (17) are further provided on the housing (1). The fluid inlet (16) is located between the two upper tube sheets (11), and the fluid outlet (17) is located between the two lower tube sheets (11); The flue gas outlet (122) communicates with an outlet three-way valve (13); The flue gas inlet (121) communicates with an inlet three-way valve (18).

2. The heat exchanger according to claim 1, characterized in that, The inlet three-way valve (18) is a three-way confluence solenoid valve, and the outlet three-way valve (13) is a three-way diversion solenoid valve; The inlet three-way valve (18), the outlet three-way valve (13), and the temperature monitor (123) are all electrically connected to the controller respectively.

3. The heat exchanger according to claim 1, characterized in that, The outer diameter of the second tube (15) is 1 / 3 - 1 / 2 of the inner diameter of the first tube (14).

4. The heat exchanger according to claim 3, characterized in that, A spiral guide vane (19) is installed between the first tube (14) and the second tube (15), and the blade width of the spiral guide vane (19) is the same as the annulus width between the first tube (14) and the second tube (15).

5. The heat exchanger according to claim 1, characterized in that, Four fluid inlets (16) are evenly arranged on the housing (1) along the circumferential direction.

6. The heat exchanger according to any one of claims 1-5, characterized in that, Inside the housing (1), heat insulation materials are filled between the two middle tube sheets (11).

7. A heat exchange module, characterized in that, It includes a primary flue (21), a secondary flue (22), an exhaust flue (23), a recovery flue (24), an intermediate flue gas storage tank (3), and a heat exchanger according to any one of claims 1 - 6; Two inlets of the inlet three-way valve (18) are respectively communicated with the primary flue (21) and the secondary flue (22); Two outlets of the outlet three-way valve (13) are respectively communicated with the exhaust flue (23) and the recovery flue (24). The recovery flue (24) is communicated with the inlet of the intermediate flue gas storage tank (3), and the outlet of the intermediate flue gas storage tank (3) is communicated with the secondary flue (22).

8. The heat exchange module according to claim 7, wherein The primary flue (21) is also communicated with the intermediate flue gas storage tank (3), and a control valve (31) is provided between the primary flue (21) and the intermediate flue gas storage tank (3).

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