Double-effect heat exchange equipment and double-effect condensation system

Abstract

According to the double-effect heat exchange equipment, the shell-and-tube heat exchanger is adopted, the tube pass serves as a first heat exchange channel and is used for introducing fluid to be subjected to heat exchange, the shell pass is of an independently-arranged two-section structural design, and the first heat exchanger and the second heat exchanger are sequentially arranged in the flowing direction of the fluid to be subjected to heat exchange; and the heat exchange efficiency of the second heat exchange medium flowing in the second heat exchanger is higher than or lower than that of the first heat exchange medium flowing in the first heat exchanger. Compared with the mode that only one heat exchange medium is adopted for heat exchange in the prior art, the purpose that two different heat exchange media are arranged for heat exchange of the fluid to be subjected to heat exchange is mainly reflected in improving the heat exchange efficiency and achieving accurate temperature control. The utility model further provides a double-effect condensation system with the double-effect heat exchange equipment.

Description

Technical Field

[0001] This utility model belongs to the field of heat exchanger technology, and relates to a double-effect heat exchange device, and particularly to a double-effect heat exchange device and double-effect condensation system applied to a lyocell fiber production reactor. Background Technology

[0002] Currently, the most widely used heat exchanger in chemical and other industries is the shell-and-tube heat exchanger, also known as a tube-and-tube heat exchanger. When using a heat exchanger for condensation, only one type of cold medium can be used for heat exchange. That is, the condensation system uses a chiller unit to cool the water to obtain chilled water at a lower temperature. When the temperature of the heat medium is high, the consumption of the cold medium is too high, resulting in poor energy-saving effect.

[0003] Therefore, how to overcome the above-mentioned technical defects is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a dual-effect heat exchange device and a dual-effect condensation system, which can improve heat exchange efficiency and achieve precise temperature control.

[0005] To solve the above-mentioned technical problems, this utility model provides a double-effect heat exchange device, including a shell and a heat exchange chamber disposed within the shell;

[0006] The inner cavity of the heat exchange chamber is a first heat exchange channel for introducing the fluid to be heat exchanged, and the two ends of the heat exchange chamber are respectively provided with a medium inlet and a medium outlet of the first heat exchange channel.

[0007] A second heat exchange channel for exchanging heat with the first heat exchange channel is provided between the shell and the heat exchange chamber. The second heat exchange channel includes a first heat exchanger and a second heat exchanger arranged along the medium flow direction of the first heat exchange channel. The heat exchange channel of the first heat exchanger contains a first heat exchange medium, and the heat exchange channel of the second heat exchanger contains a second heat exchange medium. The heat exchange efficiency of the second heat exchange medium is higher or lower than that of the first heat exchange medium.

[0008] Optionally, in the above-mentioned double-effect heat exchange device, the fluid to be exchanged is a mixed gas or liquid from the reactor;

[0009] And / or, the first heat exchange medium is circulating cooling water from the cooling tower;

[0010] And / or, the second heat exchange medium is chilled water from the refrigeration unit.

[0011] Optionally, in the above-mentioned double-effect heat exchange device, the first heat exchanger includes a plurality of heat exchange channels arranged side by side, the plurality of heat exchange channels being arranged in a meandering manner along the horizontal or vertical direction, and / or, the second heat exchanger includes a plurality of heat exchange channels arranged side by side, the plurality of heat exchange channels being arranged in a meandering manner along the horizontal or vertical direction.

[0012] This utility model also provides a dual-effect condensation system, including a cooling tower, a refrigeration unit, and a dual-effect heat exchange device as described above. The inlet of the first heat exchanger of the dual-effect heat exchange device is connected to the water inlet of the cooling tower, the outlet of the first heat exchanger is connected to the water outlet of the cooling tower, the inlet of the second heat exchanger is connected to the inlet of the refrigeration unit, and the outlet of the second heat exchanger is connected to the outlet of the refrigeration unit.

[0013] Optionally, in the above-mentioned double-effect condensing system, a chilled water tank is provided between the outlet of the second heat exchanger and the refrigeration unit.

[0014] Optionally, in the above-mentioned dual-effect condensing system, a switch valve is provided on the connecting pipe at the inlet end of the first heat exchange channel, and / or the connecting pipe between the outlet of the first heat exchanger and the cooling tower, and / or the connecting pipe between the outlet of the second heat exchanger and the chilled water tank.

[0015] Optionally, the above-mentioned double-effect condensing system also includes a control device, wherein the switching valve is a solenoid valve, and the control device is used to control the switching of each solenoid valve.

[0016] Optionally, in the above-mentioned double-effect condensing system, the first medium inlet of the chiller unit is connected to the chilled water tank, the first medium outlet is connected to the inlet of the second heat exchanger, and the second medium inlet and the second medium outlet of the chiller unit are respectively connected to the outlet and inlet of the cooling tower.

[0017] Optionally, in the above-mentioned double-effect condensing system, a vacuum pump is provided at the outlet end of the first heat exchange channel.

[0018] Optionally, in the above-mentioned double-effect condensing system, when the fluid to be heat exchanged is a gas, a condensate outlet is provided at the bottom of the lower end of the heat exchange chamber.

[0019] This utility model provides a dual-effect heat exchange device, the advantages of which are:

[0020] A shell-and-tube heat exchanger is employed, with the tube side serving as the first heat exchange channel for the fluid to be heat-exchanged. The shell side features an independently designed two-section structure, with the first and second heat exchangers sequentially arranged along the flow direction of the fluid. The heat exchange efficiency of the second heat exchange medium flowing in the second heat exchanger is either higher or lower than that of the first heat exchange medium flowing in the first heat exchanger. Compared to existing technologies that use only one heat exchange medium, this scheme uses two different heat exchange media to improve heat exchange efficiency and achieve precise temperature control.

[0021] This utility model also provides a dual-effect condensation system with the above-mentioned dual-effect heat exchange device, which has the same beneficial effects, and will not be described in detail here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 A perspective view of the first heat exchange channel of a heat exchange chamber provided for an embodiment of this utility model;

[0024] Figure 2 A perspective view of the double-effect heat exchange device provided in the first embodiment of this utility model at the second heat exchange channel;

[0025] Figure 3 A perspective view of the double-effect heat exchange device provided in the second embodiment of this utility model at the second heat exchange channel;

[0026] Figure 4 A schematic diagram of the medium flow in the double-effect heat exchange device provided in the first embodiment of this utility model;

[0027] Figures 5-6 The diagram shows the working principle of the dual-effect heat exchange device and external equipment provided in the first embodiment of this utility model.

[0028] In the image above:

[0029] 100 - Double-effect heat exchange equipment; 110 - First heat exchange channel; 121 - First heat exchanger; 122 - Second heat exchanger;

[0030] 200-Vacuum Pump;

[0031] 300 - Cooling Tower;

[0032] 410 - Chilled water tank; 420 - Refrigeration unit;

[0033] 510 - First water pump; 520 - Second water pump;

[0034] 610 - First solenoid valve; 620 - Second solenoid valve;

[0035] A - Fluid to be exchanged for heat; B - Chilled water; C - Circulating cooling water; D - Condensate. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] The core of this invention is to provide a dual-effect heat exchange device and a dual-effect condensation system, which can improve heat exchange efficiency and achieve precise temperature control.

[0038] To enable those skilled in the art to better understand the technical solutions provided by this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] For details, please refer to Figures 1-6 The present invention provides a dual-effect heat exchange device 100, which includes a housing and a heat exchange chamber disposed within the housing.

[0040] The inner cavity of the heat exchange chamber is the first heat exchange channel 110, used to introduce the fluid A to be heat exchanged. The two ends of the heat exchange chamber are respectively provided with a medium inlet and a medium outlet for the first heat exchange channel 110, such as... Figure 1 As shown, the medium inlet and medium outlet are located at the upper and lower ends of the heat exchange chamber, respectively, for the entry and exit of the fluid A to be heat exchanged. The fluid A to be heat exchanged is the heat transfer medium in the double-effect heat exchange device 100 of this invention. The medium inlet and medium outlet of the first heat exchange channel 110 both penetrate the shell and are connected to the outside.

[0041] A second heat exchange channel for exchanging heat with the first heat exchange channel 110 is provided between the shell and the heat exchange chamber. The second heat exchange channel includes a first heat exchanger 121 and a second heat exchanger 122 arranged along the medium flow direction in the first heat exchange channel 110. The second heat exchange medium flowing in the heat exchange channel of the second heat exchanger 122 is a second heat exchange medium. The heat exchange efficiency of the second heat exchange medium is higher or lower than that of the first heat exchange medium.

[0042] It should be noted that, based on the temperature zone heat exchange requirements of the first heat exchange channel 110, this case selects two heat exchange media to exchange heat in different temperature zones of the first heat exchange channel 110. The two heat exchange media are chosen based on the actual application scenario, employing two different media with different heat exchange efficiencies (selected with reasonable physical properties, such as specific heat capacity and thermal conductivity), thereby achieving more effective heat exchange. Simultaneously, using different heat exchange media allows for more precise temperature control. It also provides accurate temperature conditions according to the needs of different process stages, ensuring product quality and production efficiency. For example, in some chemical processes, different reaction stages may require strict control within specific temperature ranges; this goal can be more easily achieved by using different cooling media.

[0043] The dual-effect heat exchange device 100 provided in this solution adopts a shell-and-tube heat exchanger. The tube side serves as the first heat exchange channel for introducing the fluid A to be heat exchanged. The shell side adopts an independently designed two-section structure. A first heat exchanger 121 and a second heat exchanger 122 are sequentially arranged along the flow direction of the fluid A. The heat exchange efficiency of the second heat exchange medium flowing in the second heat exchanger 122 is higher or lower than the heat exchange efficiency of the first heat exchange medium flowing in the first heat exchanger 121. Compared to the existing technology that uses only one heat exchange medium, the purpose of this solution in using two different heat exchange media to exchange heat with the fluid A is mainly to improve heat exchange efficiency and achieve precise temperature control.

[0044] In a specific embodiment, the fluid A to be heat exchanged is a mixed gas or liquid from the reactor. The first heat exchange medium is circulating cooling water C from cooling tower 300. The second heat exchange medium is chilled water B from refrigeration unit 420.

[0045] It should be noted that the cooling tower 300 can naturally dissipate heat from the circulating cooling water C discharged from the outlet of the first heat exchanger 121. After releasing some heat, it is then sent back to the inlet of the first heat exchanger 121, where it exchanges heat with the heat medium as circulating cooling water C within the heat exchange channel of the first heat exchanger 121. The cooling tower 300 releases a certain amount of heat to the outside through natural heat dissipation, thereby replacing part of the cooling effect achieved by the refrigeration unit 420 in the prior art.

[0046] The chilled water B discharged from the outlet of the second heat exchanger 122 is cooled by the chiller unit 420 and then sent to the inlet of the second heat exchanger 122. In the heat exchange channel of the second heat exchanger 122, the chilled water B exchanges heat with the heat medium.

[0047] The second heat exchange channel adopts an adjacent and segmented mode for the first heat exchanger 121 and the second heat exchanger 122. The cooling tower 300 can naturally dissipate heat from the circulating cooling water C discharged from the outlet of the first heat exchanger 121, effectively saving the power consumption of the refrigeration unit. The heat exchange efficiency is improved by using these two cold media to exchange heat with the hot media.

[0048] This setup effectively and stably maintains equipment operation, ensures equipment sealing and pressure stability, reduces the consumption of chilled water B, and saves electricity for the chiller unit, thus achieving energy conservation and consumption reduction.

[0049] To further improve heat exchange efficiency, the first heat exchanger 121 includes multiple heat exchange channels arranged side-by-side. The second heat exchanger 122 also includes multiple heat exchange channels arranged side-by-side. Specifically, such as... Figure 2 As shown, the heat exchange channels of the first heat exchanger 121 and the second heat exchanger 122 are arranged in a detour along the vertical direction. Alternatively, as shown... Figure 3 As shown, the heat exchange channels of the first heat exchanger 121 and the second heat exchanger 122 are arranged in a meandering manner along the horizontal direction.

[0050] In addition, this solution also provides a dual-effect condensing system, including a cooling tower 300, a refrigeration unit 420, and a dual-effect heat exchange device 100 in the above specific embodiment. The inlet of the first heat exchanger 121 of the dual-effect heat exchange device 100 is connected to the water inlet of the cooling tower 300, the outlet of the first heat exchanger 121 is connected to the water outlet of the cooling tower 300, the inlet of the second heat exchanger 122 is connected to the inlet of the refrigeration unit 420, and the outlet of the second heat exchanger 122 is connected to the outlet of the refrigeration unit 420.

[0051] Obviously, the double-effect condensing system including the aforementioned double-effect heat exchange device 100 has the same beneficial effects, which will not be elaborated here.

[0052] In a specific embodiment, to ensure sufficient refrigerant, a chilled water tank 410 is provided between the outlet of the second heat exchanger 122 and the chiller unit 420. The chilled water tank 410 can temporarily store chilled water B to supply the chiller unit 420. In one embodiment, an external pipe for replenishing chilled water B can be provided on the chilled water tank 410. In another embodiment, a water level detection device can be installed in the chilled water tank 410, which can replenish water to the chilled water tank 410 when the water level drops to a preset value.

[0053] Furthermore, switch valves can be installed on the connecting pipe at the inlet end of the first heat exchange channel, and / or on the connecting pipe between the outlet of the first heat exchanger 121 and the cooling tower 300, and / or on the connecting pipe between the outlet of the second heat exchanger 122 and the chilled water tank 410, so as to control the opening and closing of the corresponding heat exchange channel through each switch valve.

[0054] To further achieve automatic control, solenoid valves are used for switching. This solution also includes a control device to control the opening and closing of each solenoid valve. For example, a first solenoid valve 610 is installed on the pipeline between the outlet of the first heat exchanger 121 and the cooling tower 300. A second solenoid valve 620 is installed on the pipeline between the outlet of the second heat exchanger 122 and the chilled water tank 410.

[0055] In a specific embodiment, the first medium inlet of the chiller unit 420 is connected to the chilled water tank 410, and the first medium outlet of the chiller unit 420 is connected to the inlet of the second heat exchanger 122. The second medium inlet and the second medium outlet of the chiller unit 420 are respectively connected to the outlet and inlet of the cooling tower 300. A portion of the circulating cooling water C from the cooling tower 300 enters the second medium channel of the chiller unit 420 through the second medium inlet, and after being heated, is returned to the cooling tower 300 from the second medium outlet. Chilled water B from the chilled water tank 410 enters the first medium channel of the chiller unit 420 through the first medium inlet, and after being cooled, is sent to the inlet of the second heat exchanger 122 from the first medium outlet.

[0056] In a specific embodiment, a vacuum pump 200 is installed at the outlet end of the first heat exchange channel. During the initial operation of the double-effect heat exchange device 100, the vacuum pump 200 can create negative pressure within the first heat exchange channel, expelling internal gases and moisture, and introducing mixed gas A from the reactor into the first heat exchange channel. The vacuum pump 200 provides the power for the introduction of mixed gas A. A switch valve at the inlet end of the first heat exchange channel controls whether mixed gas A from the reactor can enter the first heat exchange channel. Specifically, depending on actual needs, valves such as the switch valve connecting the double-effect heat exchange device 100 to the outside can be closed, and the vacuum pump 200 can be used to create a vacuum inside the device.

[0057] In addition, in order to improve the circulation power of circulating cooling water C and chilled water B, a first water pump 510 can be installed on the connecting pipe between the first heat exchanger 121 and the cooling tower 300, and a second water pump 520 can be installed on the connecting pipe between the second heat exchanger 122 and the chiller unit 420.

[0058] In one specific embodiment, the fluid A to be heat exchanged is a mixed gas from the reactor. In this case, the mixed gas is drawn in by negative pressure and enters the double-effect heat exchange device 100, then flows through the tube side (i.e., the first heat exchange channel). The shell side adopts a precise two-section arrangement, connecting the first section (i.e., the first heat exchanger 121) and the second section (i.e., the second heat exchanger 122). Heat exchange media of different temperatures are used to cool the mixed gas. The first section uses circulating cooling water C, and the second section uses chilled water B, which greatly improves the utilization rate of circulating cooling water C, reduces the amount of chilled water B used in industrial refrigeration, and reduces production costs.

[0059] Specifically, depending on the actual situation, the heat exchange area of ​​the first heat exchanger 121 can be designed to be greater than, less than or equal to the heat exchange area of ​​the second heat exchanger 122. By controlling the heat exchange area of ​​the two sections in a segmented mode, the purpose of precise temperature control can be achieved, enabling precise temperature control at different stages and more accurate control of the reactor temperature and reaction process.

[0060] In a specific embodiment, a medium inlet is provided on the upper side of the heat exchange chamber, a medium outlet is provided on the lower side of the heat exchange chamber, and a condensate outlet is provided at the bottom of the lower end of the heat exchange chamber. The medium inlet, medium outlet, and condensate outlet can all communicate with the inner cavity of the heat exchange chamber and extend through the shell to the outside. As the mixed gas cools, a certain amount of condensate will be generated inside, and the condensate will settle at the bottom of the heat exchange chamber under gravity. Specifically, a solenoid valve can also be provided at the condensate outlet. The opening and closing of this solenoid valve is controlled by a control device. When the condensate at the bottom of the heat exchange chamber accumulates to a preset liquid level, the solenoid valve located at the bottom of the heat exchange chamber is opened to facilitate the smooth discharge of the condensate.

[0061] By adopting the above-described embodiments, the consumption of chilled water B in the workshop can be effectively reduced, reactor steam can be effectively condensed, the optimal process temperature and pressure in the reaction can be maintained, and energy conservation and consumption reduction can be achieved.

[0062] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0063] In the description of this application, "multiple" means two or more. If "first" or "second" is mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0064] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0065] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0066] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0067] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0068] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A double-effect heat exchange apparatus, characterized by, The heat exchange device comprises a shell and a heat exchange chamber arranged in the shell. The inner cavity of the heat exchange chamber is a first heat exchange channel (110) for passing the fluid (A) to be exchanged. The second heat exchange channel is arranged between the shell and the heat exchange chamber for exchanging heat with the first heat exchange channel (110), and comprises a first heat exchanger (121) and a second heat exchanger (122) arranged along the medium flow direction of the first heat exchange channel (110).

2. The double-effect heat exchange apparatus according to claim 1, wherein The fluid (A) to be exchanged is mixed gas or liquid from a reactor. The first heat exchange medium is circulating cooling water (C) from a cooling tower (300). The second heat exchange medium is chilled water (B) from a chiller unit (420).

3. The double-effect heat exchange apparatus of claim 1, wherein The first heat exchanger (121) comprises a plurality of heat exchange channels arranged side by side, and the plurality of heat exchange channels are arranged in a horizontal direction or a vertical direction.

4. A double-effect condensing system characterized in that, The second heat exchanger (122) comprises a plurality of heat exchange channels arranged side by side, and the plurality of heat exchange channels are arranged in a horizontal direction or a vertical direction.

5. The double-effect condensing system of claim 4, wherein, The heat exchange device (100) comprises a cooling tower (300), a chiller unit (420), and the heat exchange device (100) according to any one of claims 1-3.

6. The double-effect condensing system of claim 5, wherein, The outlet of the second heat exchanger (122) is connected to the chiller unit (420) through a chilled water tank (410).

7. The dual-effect condensing system of claim 6, wherein, The inlet end of the first heat exchange channel is connected to the cooling tower (300) through a connecting pipe, and / or the outlet of the first heat exchanger (121) is connected to the cooling tower (300) through a connecting pipe, and / or the outlet of the second heat exchanger (122) is connected to the chilled water tank (410) through a connecting pipe.

8. The double-effect condensing system of claim 5, wherein, The connecting pipes are provided with on-off valves.

9. The dual-effect condensing system of claim 4, wherein, The on-off valves are solenoid valves, and a control device is arranged to control the opening and closing of the solenoid valves. The first medium inlet of the chiller unit (420) is connected to the chilled water tank (410), the first medium outlet is connected to the inlet of the second heat exchanger (122), the second medium inlet and the second medium outlet of the chiller unit (420) are connected to the outlet and the inlet of the cooling tower (300), respectively. The outlet end of the first heat exchange channel is provided with a vacuum pump.

10. The dual-effect condensing system of claim 4, wherein, When the fluid to be exchanged (A) is a gas, the lower end of the heat exchange chamber is provided with a condensate outlet.

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