Heat exchange device and heat supply system

Abstract

The embodiment of the invention relates to a heat energy recovery device, in particular to a heat exchange device and a heat exchange system.The heat exchange device comprises a generator, a preheating module, a heat exchange module and an evaporation module; the generator desorbs the low-temperature dilute solution through the high-temperature medium to form a concentrated solution and superheated steam, and the concentrated solution and the superheated steam are discharged; the preheating module receives the concentrated solution discharged by the generator, preheats the concentrated solution and discharges the preheated concentrated solution; the heat exchange module receives the superheated steam discharged by the generator, exchanges heat between the superheated steam and working medium water to enable the superheated steam to form condensate water, and further exchanges heat between the condensate water and a high-temperature medium flowing through the heat exchange module to enable the condensate water to be changed into the superheated steam again to be discharged; and the evaporation module receives the concentrated solution discharged by the preheating module and the superheated steam discharged by the heat exchange module, so that the superheated steam and the concentrated solution are mixed to form a high-temperature dilute solution capable of exchanging heat with circulating water flowing through again. Compared with the prior art, under the same source temperature, the target outlet temperature is higher, and medium-high temperature industrial heat can be effectively covered.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to an industrial waste heat recovery and high-temperature heat supply device, in particular to a heat exchange device and a heat exchange system. BACKGROUND

[0002] Common heat pump recovery technologies include two categories: compression heat pump systems and absorption heat pump systems. Compression heat pump systems have the advantages of high efficiency and compact structure, but the evaporator is usually limited to a high evaporation temperature, which results in the inability to directly utilize deep waste heat sources below the ambient temperature. Although absorption heat pump systems (especially the second type of absorption heat pump, i.e., the temperature-increasing absorption heat pump) can achieve temperature-increasing utilization of low-temperature heat sources and are suitable for deep waste heat recovery, they have problems such as high requirements for driving heat sources (requiring medium-high temperature heat sources), limited temperature-increasing capacity, and difficulty in meeting high-grade heat utilization requirements due to the output temperature.

[0003] Therefore, some research attempts to use absorption heat pumps in combination with compression heat pumps, i.e., to use an absorption system to preliminarily increase the temperature of the heat source, and then to use a compression system to further increase the temperature, so as to recover low-temperature waste heat and output high-temperature heat. However, most of the existing schemes are only used in series, and there is a lack of efficient energy coupling between the subsystems, the overall energy efficiency of the system is low, the structure is redundant, the economy is poor, and the heat transfer path is not optimized, which has problems such as large heat loss and low coupling efficiency. SUMMARY

[0004] The purpose of the embodiments of the present application is to design a heat exchange device and a heat exchange system that can deeply recover low-temperature waste heat and achieve a wide temperature-increasing range, thereby solving the problems of insufficient waste heat utilization, excessively high compressor pressure ratio, and working fluid safety.

[0005] To achieve the above purpose, the embodiments of the present application provide a heat exchange device, which comprises: a generator configured to flow through a high-temperature medium, so that the high-temperature medium desorbs a low-temperature dilute solution, and the low-temperature dilute solution forms a concentrated solution and overheat steam is discharged; a preheating module connected to the generator, configured to receive the concentrated solution discharged by the generator, and discharge the concentrated solution after preheating; a heat exchange module connected to the generator, configured to receive the overheat steam discharged by the generator, and exchange heat between the overheat steam and working water flowing therethrough, so that the overheat steam forms condensed water; the heat exchange module is further configured to exchange heat between the condensed water and the high-temperature medium flowing therethrough, so that the condensed water is discharged again as overheat steam; An evaporation module is connected with the preheating module and the heat exchange module respectively, and is used for receiving the concentrated solution discharged by the preheating module and the superheated steam discharged by the heat exchange module, mixing the superheated steam with the concentrated solution to form high-temperature dilute solution again, and performing heat exchange between the high-temperature dilute solution and circulating water. Wherein, when the low-temperature dilute solution formed by mixing the superheated steam with the concentrated solution performs heat exchange with the circulating water in the evaporation module, the circulating water becomes steam and is discharged, and the low-temperature dilute solution flows back to the generator again.

[0006] In addition, the embodiment of the present application further provides a heat supply system, which comprises: The heat exchange device as described above; A first preheating module is connected with the heat exchange module, and is used for circulating working medium water and performing first-stage heat exchange between the working medium water and the superheated steam, and then discharging the working medium water. A second preheating module is connected with the first preheating module and the generator respectively, and is used for receiving the working medium water discharged by the first preheating module and receiving the high-temperature medium discharged by the generator, and performing second-stage heat exchange between the working medium water and the high-temperature medium, and then discharging the working medium water. A first flash tank is connected with the evaporation module, and is used for receiving the steam discharged by the evaporation module and removing liquid from the steam, so that the steam forms high-temperature gas which can be discharged and circulating water which can flow back to the evaporation module. A condensation module is connected with the first flash tank and the second preheating module respectively, and is used for receiving the high-temperature gas discharged by the first flash tank and receiving the working medium water discharged by the second preheating module, and performing heat exchange between the high-temperature gas and the working medium water, so that the working medium water becomes steam and is discharged. A second flash tank is connected with the condensation module, and is used for receiving the steam discharged by the condensation module and removing liquid from the steam, so that the steam forms high-temperature gas which can be discharged and working medium water which can flow back to the condenser again.

[0007] The embodiment of the present application has the advantages that, compared with the prior art, the heat exchange device comprises a generator, a preheating module, a heat exchange module and an evaporation module. The high-temperature medium flowing through the generator can desorb the low-temperature dilute solution, so that the low-temperature dilute solution can form concentrated solution discharged into the preheating module and superheated steam discharged into the heat exchange module. The preheating module can preheat the received concentrated solution and discharge the preheated concentrated solution into the evaporation module. The heat exchange module can exchange heat between the received steam and the working fluid flowing through the heat exchange module, so that the superheated steam can form condensed water, and the condensed water can be exchanged with the high-temperature medium flowing through the heat exchange module, so that the condensed water can be discharged as superheated steam again. In addition, the evaporation module can mix the received concentrated solution and superheated steam to form low-temperature dilute solution, so that the low-temperature dilute solution can exchange heat with the circulating water flowing through the heat exchange device and form steam discharged. It can be seen that the heat exchange device can effectively recover the waste heat in the low-temperature dilute solution, so as to significantly expand the temperature range of the heat supply. Therefore, under the same source temperature, the target outlet temperature is higher, and the industrial heat of medium and high temperature can be effectively covered. BRIEF DESCRIPTION OF DRAWINGS

[0008] One or more embodiments are illustrated by way of example in the figures that form a part of this patent document. These example illustrations are not intended to limit the implementation of the embodiments, in which elements having similar or the same reference numbers designate analogous elements. The figures in the drawings are not to scale, except if specifically noted.

[0009] Figure 1 A schematic diagram of a heat supply system according to an embodiment of the present application. DETAILED DESCRIPTION

[0010] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the embodiments of the present application, many technical details are proposed in order to make the readers better understand the present application. However, the technical solutions claimed by the present application can be realized even without these technical details and various changes and modifications based on the following embodiments.

[0011] Embodiment one Embodiment one of the present application relates to a heat exchange device, as shown in the figure, which comprises a generator 01, a preheating module, a heat exchange module and an evaporation module 05. Figure 1

[0012] Among them, in combination with Figure 1 ​As shown, the generator 01 is used to flow through the high-temperature medium, so that the high-temperature medium desorbs the low-temperature dilute solution, and the low-temperature dilute solution forms a concentrated solution and overheat steam is discharged. Secondly, the preheating module is connected with the generator 01, and the preheating module is used to receive the concentrated solution discharged by the generator 01, and the concentrated solution is preheated and discharged.

[0013] In addition, in combination with Figure 1 As shown, the heat exchange module is connected with the generator 01, and the heat exchange module is used to receive the overheat steam discharged by the generator 01, and the overheat steam is exchanged with the working water flowing through, so that the overheat steam forms condensed water, and the heat exchange module is also used to exchange the condensed water with the high-temperature medium flowing through, so that the condensed water becomes overheat steam again and is discharged.

[0014] Finally, in combination with Figure 1 As shown, the evaporation module 05 is connected with the preheating module and the heat exchange module, respectively, and the evaporation module 05 is used to receive the concentrated solution discharged by the preheating module and the overheat steam discharged by the heat exchange module, so that the overheat steam and the concentrated solution are mixed to form a high-temperature dilute solution which can be exchanged with the circulating water flowing through.

[0015] And it should be noted that when the high-temperature dilute solution formed by mixing the overheat steam and the concentrated solution is exchanged with the circulating water flowing through in the evaporation module 05, the circulating water can become steam and be discharged, and the high-temperature dilute solution becomes low-temperature dilute solution and flows back to the generator 01.

[0016] From the above, it is not difficult to see that since the heat exchange device includes the generator 01, the preheating module, the heat exchange module and the evaporation module 05, the high-temperature medium flowing through the generator 01 can desorb the low-temperature dilute solution, so that the low-temperature dilute solution can form a concentrated solution discharged into the preheating module and overheat steam discharged into the heat exchange module. And through the preheating module, the received concentrated solution can be preheated, and the preheated concentrated solution can be discharged to the evaporation module 05, and through the heat exchange module, the received steam can be exchanged with the working water flowing through, so that the overheat steam can form condensed water, and the condensed water can be exchanged with the high-temperature medium flowing through, so that the condensed water can become overheat steam again and be discharged. In addition, through the evaporation module 05, the received concentrated solution and overheat steam can be mixed to form a high-temperature dilute solution, so that the high-temperature dilute solution can be exchanged with the circulating water flowing through and form steam and be discharged. It is not difficult to see that the heat exchange device can effectively recover the waste heat in the low-temperature dilute solution, so as to significantly expand the temperature range of heat supply, so that the outlet temperature of the target is higher under the same temperature source, and the medium and high-temperature industrial heat can be effectively covered.

[0017] Specifically, in some embodiments, as Figure 1As shown, the preheating module includes a first preheater 26 and a second preheater 27, wherein the first preheater 26 is connected with the generator 01 and the heat exchange module respectively, and is used to receive the concentrated solution discharged by the generator 01 and preheat the concentrated solution in a first stage before discharging. Meanwhile, as shown in Figure 1 the first preheater 26 is also used to receive the low-temperature dilute solution discharged by the heat exchange module and make the low-temperature dilute solution backflow to the generator 01. Secondly, as shown in Figure 1 the second preheater 27 is connected with the first preheater 26 and the heat exchange module respectively, and is used to receive the concentrated solution discharged by the first preheater 26 and preheat the concentrated solution in a second stage before discharging to the evaporation module 05. Meanwhile, the second preheater 27 is also used to receive the high-temperature dilute solution discharged by the evaporation module 05 and discharge the high-temperature dilute solution to the heat exchange module. As can be seen, the concentrated solution after desorption by the generator 01 can effectively improve the temperature of the concentrated solution entering the evaporation module 05 after preheating by the first preheater 26 and the second preheater 27, so that the evaporation module 05 has better heat exchange efficiency for the circulating water flowing therethrough.

[0018] Moreover, in order to preheat the concentrated solution by the first preheater 26, in some embodiments, as shown in Figure 1 the first preheater 26 has a first liquid inlet passage 261 capable of conveying the concentrated solution and a first liquid return passage 262 capable of conveying the low-temperature dilute solution, wherein the concentrated solution entering the first liquid inlet passage 261 can exchange heat with the low-temperature dilute solution entering the first liquid return passage 262, so as to increase the temperature of the concentrated solution and decrease the temperature of the low-temperature dilute solution. Similarly, in order to preheat the concentrated solution by the second preheater 27, in other embodiments, as shown in Figure 1 the second preheater 27 has a second liquid inlet passage 271 capable of conveying the concentrated solution and a second liquid return passage 272 capable of conveying the high-temperature dilute solution, wherein the concentrated solution entering the second liquid inlet passage 271 exchanges heat with the high-temperature dilute solution entering the second liquid return passage 272, so as to increase the temperature of the concentrated solution and decrease the temperature of the high-temperature dilute solution to become low-temperature dilute solution. For example, in some embodiments, in the first preheater 26, as shown in Figure 1 the liquid inlet end and the liquid outlet end of the first liquid inlet passage 261 can be connected with the generator 01 and the liquid inlet end of the second liquid inlet passage 271 respectively, and the liquid inlet end and the liquid outlet end of the first liquid return passage 262 can be connected with the heat exchange module and the generator 01 respectively. Secondly, in the second preheater 27, as shown in Figure 1As shown, the liquid outlet end of the second liquid inlet passage 271 is also connected with the evaporation module 05, and the liquid inlet end and the liquid outlet end of the second liquid outlet passage 272 can be connected with the evaporation module 05 and the heat exchange module respectively. As can be seen, in the application process, the first solution pump 15 can be arranged on the pipeline connected with the generator 01 at the liquid inlet end of the first liquid inlet passage 261, and the first throttling valve 20 can be arranged on the pipeline connected with the generator 01 at the liquid outlet end of the first liquid outlet passage 262. By driving the first solution pump 15 and adjusting the first throttling valve 20, the low-temperature dilute solution in the generator 01 can pass through the first liquid inlet passage 261 of the first preheater 26, the second liquid inlet passage 271 of the second preheater 27 in sequence, and be pumped into the evaporation module 05 in a preset flow rate. When the concentrated solution enters the evaporation module 05, it can be mixed with the steam entering the evaporation module 05 to form a high-temperature dilute solution, so that the high-temperature dilute solution can exchange heat with the circulating water flowing through the evaporation module 05 to form steam and be discharged, and the high-temperature dilute solution continues to be driven by the first solution pump 15 to pass through the second liquid outlet passage 272, the heat exchange module and the first liquid outlet passage 262 in sequence to become a low-temperature dilute solution and return to the generator 01, so that the low-temperature dilute solution can be circulated between the first preheater 26, the second preheater 27, the evaporation module 05, the heat exchange module and the generator 01, thereby continuously exchanging heat with the circulating water flowing through the evaporation module 05.

[0019] It is worth noting that, in the first preheater 26, Figure 1 As shown, when the low-temperature dilute solution passes through the first liquid outlet passage 262, it can exchange heat with the concentrated solution passing through the first liquid inlet passage 261, thereby achieving a first-stage preheating of the concentrated solution entering the evaporation module 05. Similarly, in the second preheater 27, Figure 1 As shown, when the low-temperature dilute solution passes through the second liquid outlet passage 272, it can exchange heat with the concentrated solution passing through the second liquid inlet passage 271, thereby achieving a second-stage preheating of the concentrated solution entering the evaporation module 05. As can be seen, in the preheating of the concentrated solution generated after desorption by the generator 01, the first preheater 26 and the second preheater 27 are not actively heating the concentrated solution, but making full use of the residual heat left after the evaporation module 05 exchanges heat with the concentrated solution, thereby further improving the heat recovery efficiency of the low-temperature dilute solution by the heat exchange device and the heat exchange efficiency of the circulating water.

[0020] In addition, in some embodiments, in order to enable the generator 01 to desorb the low-temperature dilute solution, Figure 1As shown, the generator 01 comprises a first shell pass 011 and a first tube pass 012. The first shell pass 011 is used to receive the low-temperature dilute solution discharged by the first preheater 26, and has a first liquid inlet end (not shown in the figure) connected with the first liquid return passage 262 of the first preheater 26, a first liquid outlet end (not shown in the figure) connected with the first liquid inlet passage 261 of the first preheater 26, and a first gas outlet end (not shown in the figure) connected with the heat exchange module. The first tube pass 012 is used to pass through the high-temperature medium and to exchange heat with the low-temperature dilute solution in the first shell pass 011 to desorb the low-temperature dilute solution, so that the low-temperature dilute solution forms a concentrated solution and superheated steam.

[0021] In addition, in order to mix the concentrated solution and the superheated steam received by the evaporation module 05, and to exchange heat between the high-temperature dilute solution formed by the mixing and the circulating water flowing therethrough, in some embodiments, as shown in Figure 1 As shown, the evaporation module 05 comprises a second shell pass 051 and a second tube pass 052. The second shell pass 051 is used to receive the concentrated solution and the superheated steam, and to mix the concentrated solution and the superheated steam to form a high-temperature dilute solution. The second tube pass 052 is used to flow in the circulating water, and to exchange heat between the circulating water flowing in and the high-temperature dilute solution in the second shell pass 051, so that the circulating water becomes steam and is discharged. The second shell pass 051 has a second gas inlet end connected with the heat exchange module, a second liquid inlet end connected with the second liquid inlet passage 271 and the second liquid return passage 272 of the second preheater 27 respectively, and a second liquid outlet end. As can be seen, the second shell pass 051 of the evaporation module 05 can receive the concentrated solution and the superheated steam, so that the concentrated solution and the superheated steam can be mixed to obtain a high-temperature concentrated dilute solution. The second tube pass 052 of the evaporation module 05 can flow in the circulating water, so that the circulating water and the high-temperature dilute solution are separated from each other in the evaporation module 05, and the two media can effectively exchange heat through the second shell pass 051 and the second tube pass 052.

[0022] In addition, it is worth mentioning that, in other embodiments, as shown in Figure 1 As shown, the heat exchange module comprises a condenser 02, a first evaporator 03, and a second evaporator 04. The condenser 02 is connected with the generator 01, and is used to receive the superheated steam discharged by the generator 01, and to exchange heat between the received superheated steam and the working fluid water flowing therethrough, so that the superheated steam forms condensed water and is discharged. The first evaporator 03 is connected with the condenser 02, and is used to receive part of the condensed water discharged by the condenser 02, and to exchange heat between the part of the condensed water and the high-temperature medium flowing therethrough, so that the condensed water becomes superheated steam again and is discharged. Finally, as shown in Figure 1As shown, the second evaporator 04 is connected with the first evaporator 03, the condenser 02, the first return liquid passage 262 of the first preheater 26, the second return liquid passage 272 of the second preheater 27 and the second shell side 051 of the evaporation module 05 respectively, so that the second evaporator 04 can receive the superheated steam discharged by the first evaporator 03 and the high-temperature dilute solution discharged by the second preheater 27, so that the superheated steam and the high-temperature dilute solution can be mixed into low-temperature dilute solution in the second evaporator 04. At the same time, the second evaporator 04 is also used to receive another part of the condensed water discharged by the condenser 02, and exchange heat between the part of the condensed water and the high-temperature dilute solution, so that the condensed water can form superheated steam and be discharged to the second shell side 051 of the evaporation module 05, so that the superheated steam can be mixed with the concentrated solution in the second shell side 051 of the evaporation module 05, and the high-temperature dilute solution after exchanging heat with the condensed water can be changed into low-temperature dilute solution and discharged to the first return liquid passage 262 of the first preheater 26, and finally returned to the first shell side 011 of the generator 01 through the first return liquid passage 262. As can be seen, the low-temperature dilute solution flowing through the first return liquid passage 262 can realize one-stage preheating for the concentrated solution flowing through the first liquid inlet passage 261, and the high-temperature dilute solution flowing through the second return liquid passage 272 can realize two-stage preheating for the concentrated solution flowing through the second liquid inlet passage 271, so that the temperature of the concentrated solution in the second liquid inlet passage 271 is increased and enters the second shell side 051 of the evaporation module 05, and the temperature of the high-temperature dilute solution in the second return liquid passage 272 is reduced and changed into low-temperature dilute solution and discharged into the second evaporator 04.

[0023] In addition, in some embodiments, as Figure 1As shown, the condenser 02 comprises a third shell pass 021 and a third tube pass 022, wherein the third shell pass 021 is connected with the first shell pass 011 of the generator 01, the first evaporator 03 and the second evaporator 04 respectively. The third shell pass 021 is used to receive the superheated steam discharged from the first shell pass 011 of the generator 01, while the third tube pass 022 is used to circulate water and exchange heat with the superheated steam entering the third shell pass 021, so that the superheated steam forms condensed water and is discharged to the first evaporator 03 and the second evaporator 04 respectively. The condensed water entering the first evaporator 03 can exchange heat with the high-temperature medium flowing therethrough, so that the condensed water can become superheated steam again and be discharged to the second evaporator 04. The second evaporator 04 mixes the superheated steam with the low-temperature dilute solution received from the second preheater 27, and the mixture becomes high-temperature dilute solution again after mixing and exchanges heat with the condensed water flowing therethrough, so that the condensed water can become steam again and be discharged to the evaporation module 05, while the high-temperature dilute solution becomes low-temperature dilute solution again after exchanging heat with the condensed water and is discharged to the first return liquid passage 262 of the first preheater 26, so that the low-temperature dilute solution passing through the first preheater 26 can exchange heat with the concentrated solution passing through the first liquid inlet passage 261, thereby achieving the first-stage preheating of the concentrated solution.

[0024] In addition, in order to enable the condensed water received by the first evaporator 03 and the second evaporator 04 to exchange heat, in some embodiments, as shown in FIG. 1, the first evaporator 03 and the second evaporator 04 are connected with the third shell pass 021 of the condenser 02 respectively. Figure 1As shown, the first evaporator 03 includes a fourth shell pass 031 and a fourth tube pass 032. The second evaporator 04 includes a fifth shell pass 041 and a fifth tube pass 042. The fourth shell pass 031 of the first evaporator 03 is connected to the third shell pass 021 of the condenser 02 and the fifth shell pass 041 of the second evaporator 04, so that the first evaporator 03 can receive part of the condensed water discharged from the third shell pass 021 of the condenser 02 through the fourth shell pass 031, and the fourth tube pass 032 of the first evaporator 03 can be used to flow through the high-temperature medium, so that the high-temperature medium can realize heat exchange with the condensed water, and the superheated steam formed after the heat exchange of the condensed water can be discharged into the fifth shell pass 041 of the second evaporator 04. In addition, the fifth shell pass 041 of the second evaporator 04 is connected to the first liquid return passage 262 of the first preheater 26 and the second liquid return passage 272 of the second preheater 27, respectively, so that the fifth shell pass 041 can receive the high-temperature dilute solution discharged from the second liquid return passage 272 of the second preheater 27, and mix the high-temperature dilute solution with the superheated steam entering the fifth shell pass 041 to form a low-temperature dilute solution, so that the low-temperature dilute solution can exchange heat with the condensed water flowing through the fifth tube pass 042, so that the condensed water can be changed into steam after heat exchange and discharged to the second shell pass 051 of the evaporation module 05, and the high-temperature dilute solution can be changed into a low-temperature dilute solution after heat exchange and discharged to the first liquid return passage 262 of the first preheater 26, and finally returned to the first shell pass 011 of the generator 01 through the first liquid return passage 262. It should be noted that in order to make the high-temperature medium enter the first shell pass 011 of the generator 01 and the fourth tube pass 032 of the first evaporator 03 respectively, so that the high-temperature medium can exchange heat with the condensed water entering the fourth shell pass 031 of the first evaporator 03 and the low-temperature dilute solution entering the first shell pass 011 of the generator 01, in some embodiments, as shown in Figure 1 As shown, the fifth solution pump 17 can be provided, and the liquid inlet end of the fourth shell pass 031 of the first evaporator 03 is connected to the fifth solution pump 17, and a parallel pipeline (not marked in the figure) is connected in parallel on the pipeline connecting the liquid outlet end of the fourth tube pass 032 and the liquid inlet end of the first tube pass 012, and the fifth throttling valve 22 is arranged on the parallel pipeline. By adjusting the opening of the fifth throttling valve 22, part of the high-temperature medium can directly enter the fourth tube pass 032 of the first evaporator 03 under the driving action of the fifth solution pump 17, and the other part of the high-temperature medium can directly enter the first tube pass 012 of the first generator 01.

[0025] It should be noted that when the superheated steam enters the condenser 02 through the generator 01, and the condenser 02 completes the heat exchange of the superheated steam to change it into condensed water, in order to make the condenser 02 deliver the condensed water to the fourth shell pass 031 of the first evaporator 03 and the fifth shell pass 041 of the second evaporator 04 respectively, in some embodiments, as shown in Figure 1As shown, a second solution pump 13 can be installed on the pipeline connecting the third shell side 021 of the condenser 02 and the fourth shell side 031 of the first evaporator 03, and a third solution pump 14 can be installed on the pipeline connecting the third shell side 021 of the condenser 02 and the fifth shell side 041 of the second evaporator 04. By driving the second solution pump 13, part of the condensate in the condenser 02 can be discharged into the fourth shell side 031 of the first evaporator 03. At the same time, by driving the third solution pump 14, another part of the condensate in the condenser 02 can be discharged into the fifth shell side 041 of the second evaporator 04.

[0026] It is evident that this embodiment fully utilizes the waste heat of the external industrial medium and preheats the condensate in two stages through the first evaporator 03 and the second evaporator 04 of the heat exchange module. This allows the condensate to be converted into steam and enter the second shell side 051 of the evaporation module 05. The steam can then mix with the concentrated solution entering the second shell side 051, transforming the concentrated solution into a high-temperature dilute solution. This solution then exchanges heat with the circulating water and forms steam for discharge. It is clear that this heat exchange device can effectively recover the waste heat from the low-temperature dilute solution, thereby significantly expanding the temperature range of the heating supply. Therefore, at the same source temperature, the target outlet temperature is higher, effectively covering medium and high-temperature industrial heating.

[0027] Example 2 The second embodiment of the present invention relates to a heating system, such as Figure 1 As shown, the heating system includes: a heat exchange device as described in Embodiment 1, a first preheating module 11, a second preheating module 12, a first flash tank 06, a condensation module 08, and a second flash tank 09.

[0028] Among them, such as Figure 1 As shown, the first preheating module 11 is connected to the heat exchange module, and the first preheating module 11 is used to flow through the working fluid water, and to perform a first-stage heat exchange between the flowing working fluid water and the superheated steam received by the heat exchange module before discharge, so that the superheated steam can be converted into condensate water, and the temperature of the working fluid water flowing through the first preheating module 11 rises.

[0029] Additionally, in other embodiments, such as Figure 1 As shown, the second preheating module 12 is connected to the first preheating module 11 and the generator 01 respectively. The second preheating module 12 is used to receive the working water discharged from the first preheating module 11 and the high-temperature medium discharged from the generator 1, and to perform secondary heat exchange between the working water and the high-temperature medium, so that the temperature of the working water can be further increased before being discharged.

[0030] In addition, such as Figure 1As shown, the first flash tank 06 is also connected with the second shell side 051 of the evaporation module 05, which is used to receive the steam discharged from the second shell side 051 of the evaporation module 05 and to de-liquidize the steam, so that the steam forms the high-temperature gas that can be discharged and the liquid medium that can be returned to the second tube side 052 of the evaporation module 05.

[0031] In addition, as shown in Figure 1 As shown, the condensation module 08 is connected with the first flash tank 06 and the second preheating module 12, which is used to receive the high-temperature gas discharged from the first flash tank 06 and the working medium water discharged from the second preheating module 12, and to exchange heat between the high-temperature gas and the working medium water so that the working medium water becomes steam and is discharged.

[0032] Finally, as shown in Figure 1 The second flash tank 09 is connected with the condensation module 08, which is used to receive the steam discharged from the condensation module 08 and to de-liquidize the steam, so that the steam forms the high-temperature gas that can be discharged and the liquid medium that can be returned to the condenser 08.

[0033] As can be seen from the above, in the embodiment, the evaporation temperature of the heat exchange device is raised in steps by using the first preheating module 11 and the second preheating module 12, thereby reducing the rigid dependence on high-grade external heat sources, improving the depth of waste heat utilization, and effectively reducing the operating cost of the equipment.

[0034] Specifically, in some embodiments, as shown in Figure 1 As can be seen from the above embodiment one, since the third tube side 022 of the condenser 02 can flow through the circulating water, the circulating pump 19 and the second throttling valve 25 can be arranged on the third tube side 022, so that the circulating water can circulate between the first preheating module 11 and the condenser 02, and the condenser 02 can continuously exchange heat with the circulating water received, so that the working medium can continuously exchange heat with the circulating water and the circulating water after heat exchange when passing through the first preheating module 11, thereby achieving the first heat exchange of the working medium water by the first preheating module 11. In addition, by Figure 1As can be seen, the working medium water after the first stage heat exchange of the first preheating module 11 can also enter the second preheating module 12, so that the second preheating module 12 can perform the second stage heat exchange between the high-temperature medium and the working medium water flowing therethrough, so that the working medium water can have a higher temperature when entering the condensing module 08, which ensures that the working medium water can become water vapor instantaneously after heat exchange of the condensing module 08, and then be discharged to the second flash tank 09, so that the second flash tank can effectively recover the residual heat in the water vapor after the water vapor is dehydrated, so that the residual heat can be discharged by the compressor 10 connected to the second flash tank 09, and used by the heating end, thereby significantly expanding the temperature range of heat supply, so that the target outlet temperature is higher under the same source temperature, and the medium and high-temperature industrial heat can be effectively covered.

[0035] In addition, it is worth mentioning that, in order to make the first flash tank 06 send the high-temperature gas after dehydration to the condensing module 08, so that the condensing module 08 can perform heat exchange on the working medium water flowing therethrough, in some other embodiments, a compressor 07 can be arranged on the pipeline connecting the first flash tank 06 and the condensing module 08, and a fourth solution pump 16 and a third throttling valve 21 can be arranged on the pipeline connecting the second tube 052 of the evaporation module 05 and the condensing module 08. The high-temperature gas discharged from the first flash tank 06 can be compressed by the compressor 07, so that the high-temperature gas has a higher temperature and can also speed up the heat exchange efficiency of the working medium water flowing therethrough. The fourth solution pump 16 can also transport the condensed water formed after the heat exchange of the condensing module 08 to the second tube 052 of the evaporation module 05, so that the condensed water can circulate between the evaporation module 05, the first flash tank 06 and the condenser 08 from liquid to gas and then return to liquid, which ensures that this part of liquid medium can quickly exchange heat with the working medium water discharged from the second preheating module 1, so that the working medium water can become water vapor and be discharged into the second flash tank 09, thereby increasing the flow of the high-temperature gas obtained after the dehydration of the water vapor in the second flash tank 09, and the liquid medium formed after the dehydration can be returned to the condensing module 08 again to mix with the working medium water flowing therethrough, so that it can maintain continuous heat exchange with the high-temperature gas discharged by the compressor 07.

[0036] In addition, it is worth mentioning that, in order to make the first flash tank 06 send the high-temperature gas after dehydration to the condensing module 08, so that the condensing module 08 can perform heat exchange on the working medium water flowing therethrough, in some other embodiments, a compressor 07 can be arranged on the pipeline connecting the first flash tank 06 and the condensing module 08, and a fourth solution pump 16 and a third throttling valve 21 can be arranged on the pipeline connecting the second tube 052 of the evaporation module 05 and the condensing module 08. The high-temperature gas discharged from the first flash tank 06 can be compressed by the compressor 07, so that the high-temperature gas has a higher temperature and can also speed up the heat exchange efficiency of the working medium water flowing therethrough. The fourth solution pump 16 can also transport the condensed water formed after the heat exchange of the condensing module 08 to the second tube 052 of the evaporation module 05, so that the condensed water can circulate between the evaporation module 05, the first flash tank 06 and the condenser 08 from liquid to gas and then return to liquid, which ensures that this part of liquid medium can quickly exchange heat with the working medium water discharged from the second preheating module 1, so that the working medium water can become water vapor and be discharged into the second flash tank 09, thereby increasing the flow of the high-temperature gas obtained after the dehydration of the water vapor in the second flash tank 09, and the liquid medium formed after the dehydration can be returned to the condensing module 08 again to mix with the working medium water flowing therethrough, so that it can maintain continuous heat exchange with the high-temperature gas discharged by the compressor 07.

[0037] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for realizing the present application, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. A heat exchange device, characterized in that, The heat exchange device includes: The generator is used to allow a high-temperature medium to flow through it, causing the high-temperature medium to desorb the low-temperature dilute solution, thus forming a concentrated solution and expelling superheated steam. A preheating module, connected to the generator, is used to receive the concentrated solution discharged from the generator and preheat the concentrated solution before discharging it. A heat exchange module, connected to the generator, is used to receive superheated steam discharged from the generator and exchange heat between the superheated steam and the flowing working fluid water, so that the superheated steam forms condensate; the heat exchange module is also used to exchange heat between the condensate and the flowing high-temperature medium, so that the condensate becomes superheated steam again and is discharged. An evaporation module is connected to the preheating module and the heat exchange module respectively, and is used to receive the concentrated solution discharged from the preheating module and the superheated steam discharged from the heat exchange module, so that the superheated steam and the concentrated solution are mixed to form a high-temperature dilute solution that can exchange heat with the circulating water. In this process, when the high-temperature dilute solution formed by mixing superheated steam and concentrated solution exchanges heat with the circulating water flowing through the evaporation module, the circulating water turns into steam and is discharged, while the high-temperature dilute solution turns into a low-temperature dilute solution and flows back to the generator.

2. The heat exchange device according to claim 1, characterized in that, The preheating module includes: The first preheater is connected to both the generator and the heat exchange module; the first preheater is used to receive the concentrated solution discharged from the generator and preheat the concentrated solution in one stage before discharging it. The second preheater is connected to the first preheater and the heat exchange module respectively; the second preheater is used to receive the concentrated solution discharged from the first preheater, and discharge the concentrated solution to the evaporation module after performing secondary preheating. The second preheater is also used to receive the high-temperature dilute solution discharged from the evaporation module and discharge the high-temperature dilute solution to the heat exchange module. The first preheater is also used to receive the low-temperature dilute solution discharged from the heat exchange module and to return the low-temperature dilute solution to the generator.

3. The heat exchange device according to claim 2, characterized in that, The first preheater has a first liquid inlet passage for conveying concentrated solution and a first liquid return passage for conveying low-temperature dilute solution; wherein, the concentrated solution entering the first liquid inlet passage and the low-temperature dilute solution entering the first liquid return passage exchange heat, thereby increasing the temperature of the concentrated solution and decreasing the temperature of the low-temperature dilute solution. The second preheater has a second inlet passage for conveying concentrated solutions and a second return passage for conveying high-temperature dilute solutions; wherein, the concentrated solution entering the second inlet passage exchanges heat with the high-temperature dilute solution entering the second return passage, thereby increasing the temperature of the concentrated solution and decreasing the temperature of the high-temperature dilute solution.

4. The heat exchange device according to claim 3, characterized in that, The generator includes: The first shell side is used to receive the low-temperature dilute solution discharged from the first preheater; the first shell side has a first liquid inlet end connected to the first liquid return passage of the first preheater, a first liquid outlet end connected to the first liquid inlet passage of the first preheater, and a first gas outlet end connected to the heat exchange module. The first tube side is used for the passage of high-temperature medium and for heat exchange and desorption of the low-temperature dilute solution in the first shell side, so that the low-temperature dilute solution is transformed into a concentrated solution and superheated steam.

5. The heat exchange device according to claim 3, characterized in that, The evaporation module includes: The second shell side is used to receive concentrated solutions and superheated steam, and to mix the received concentrated solutions and superheated steam to form a high-temperature dilute solution. The second tube side is used for the inflow of circulating water, and the inflowing circulating water exchanges heat with the high-temperature dilute solution in the second shell side, so that the circulating water turns into steam and is discharged. The second shell side has a second air inlet end connected to the heat exchange module, a second liquid inlet end connected to the second liquid inlet passage and the second liquid return passage of the second preheater, and a second liquid outlet end.

6. The heat exchange device according to claim 3, characterized in that, The heat exchange module includes: A condenser, connected to the generator, is used to receive the superheated steam discharged from the generator and to exchange heat between the received superheated steam and the flowing working fluid water, so that the superheated steam forms condensate and is discharged. The first evaporator is connected to the condenser and is used to receive part of the condensate discharged from the condenser and to exchange heat between the part of the condensate and the high-temperature medium flowing through it, so that the condensate is turned back into superheated steam and discharged. The second evaporator is connected to the first evaporator, the condenser, the first preheater, the second preheater, and the evaporation module, respectively. The second evaporator is used to receive the superheated steam discharged from the first evaporator and the high-temperature dilute solution discharged from the second preheater, so that the superheated steam and the high-temperature dilute solution are mixed to form a low-temperature dilute solution. The second evaporator is also used to receive another part of the condensate discharged from the condenser, and exchange the heat of the condensate with the low-temperature dilute solution, so that the condensate forms superheated steam and is discharged to the evaporation module, while the low-temperature dilute solution is discharged to the first preheater.

7. The heat exchange device according to claim 6, characterized in that, The condenser includes: The third shell side is connected to the generator, the first evaporator, and the second evaporator, respectively; the third shell side is used to receive superheated steam discharged from the generator; The third tube side is used for the flow of circulating water, which exchanges heat with the superheated steam entering the third shell side, causing the superheated steam to form condensate, which is then discharged to the first evaporator and the second evaporator respectively.

8. The heat exchange device according to claim 6, characterized in that, The first evaporator includes: The fourth shell side is connected to both the condenser and the second evaporator, and is used to receive a portion of the condensate discharged from the condenser; The fourth tube is used to pass through the high-temperature medium, which exchanges heat with the condensate, causing the condensate to form superheated steam that is discharged to the second evaporator.

9. The heat exchange device according to claim 6, characterized in that, The second evaporator includes: The fifth shell side is connected to the first evaporator, the first preheater and the second preheater respectively, and is used to receive the superheated steam discharged from the first evaporator and the high-temperature dilute solution discharged from the second preheater, so that the superheated steam and the high-temperature dilute solution are mixed to form a low-temperature dilute solution. The fifth tube is connected to the condenser and the evaporation module respectively. It is used to receive another part of the condensate discharged from the condenser, exchange heat between the condensate and the high-temperature dilute solution, so that the condensate forms steam and is discharged to the evaporation module, and so that the high-temperature dilute solution becomes a low-temperature dilute solution and is discharged to the first preheater.

10. A heating system, characterized in that, The heating system includes: The heat exchange device as described in any one of claims 1-9; The first preheating module is connected to the heat exchange module and is used to pass through the working fluid water and to discharge the working fluid water after performing a primary heat exchange with the superheated steam. The second preheating module is connected to the first preheating module and the generator respectively. It is used to receive the working water discharged from the first preheating module and the high-temperature medium discharged from the generator, and to discharge the working water and the high-temperature medium after performing a two-stage heat exchange. The first flash tank is connected to the evaporation module and is used to receive the steam discharged from the evaporation module and deliquify the steam so that the steam can be discharged as a high-temperature gas and a liquid medium that can be returned to the evaporation module. The condensation module is connected to the first flash tank and the second preheating module respectively. It is used to receive the high-temperature gas discharged from the first flash tank and the working water discharged from the second preheating module, and to exchange heat between the high-temperature gas and the working water, so that the working water turns into steam and is discharged. The second flash tank is connected to the condensation module and is used to receive the steam discharged from the condensation module and deliquinate the steam, so that the steam can be discharged as a high-temperature gas and can be returned to the condenser as a liquid medium.

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