A heat exchange unit utilizing waste heat to eliminate whitening

Abstract

The heat exchanger unit for de-whitening using waste heat provided in the present application relates to the technical field of heating equipment. The heat exchanger unit includes an auxiliary heat exchanger and a main heat exchanger connected to a heating pipe network, the secondary side outlet of the main heat exchanger is connected to the primary side inlet of the auxiliary heat exchanger through a first pipe, the primary side outlet of the auxiliary heat exchanger is connected to the inlet of a water supply tank through a second pipe, the outlet of the water supply tank is connected to the secondary side inlet of the auxiliary heat exchanger through a third pipe, and the secondary side outlet of the auxiliary heat exchanger is connected to the main heat exchanger through a fourth pipe. A first control valve is provided on the third pipe, and a water supply pump is provided on the fourth pipe. The heat exchanger unit for de-whitening using waste heat provided in the present application can heat the make-up water by using the waste heat of condensed water, and can preheat the make-up water while reducing the temperature of the condensed water to achieve the de-whitening effect, thereby ensuring the temperature of the water supply from the second network and providing reliable protection for user heating.

Description

Technical Field

[0001] The utility model relates to the technical field of heating equipment, in particular to a heat exchange unit utilizing waste heat for heat elimination. Background Art

[0002] In traditional heating heat exchange stations, many heat sources use steam, which is used to provide users with domestic hot water and heating hot water by means of heat exchange between steam and water. Many secondary stations with steam heat exchange will produce condensate during the heat exchange process, and this condensate is usually directly discharged into the ditch or connected to the water supply tank.

[0003] Since the condensate water has a high temperature, if it is directly discharged into the ditch, white smoke will be emitted from the entire station; if it is connected to a water supply tank, since most water supply tanks are open normal pressure water tanks, white smoke will be emitted from the venting port, overflow port and manhole of the water supply tank. This will not only waste water resources, but also cause visual pollution to people and affect the operating environment of the entire station. Utility Model Content

[0004] In response to the above problems, the present application provides a heat exchanger unit that utilizes waste heat to de-whiten the condensate. It can utilize the waste heat of the condensate to heat the make-up water. While lowering the condensate temperature to achieve the de-whitening effect, it can also preheat the make-up water, thereby ensuring the temperature of the secondary network water supply and providing reliable protection for user heating.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A heat exchange unit utilizing waste heat for de-whitening, comprising an auxiliary heat exchanger and a main heat exchanger connected to a heating network, wherein the secondary side outlet of the main heat exchanger is connected to the primary side inlet of the auxiliary heat exchanger through a first pipeline, the primary side outlet of the auxiliary heat exchanger is connected to the inlet of a water supply tank through a second pipeline, the outlet of the water supply tank is connected to the secondary side inlet of the auxiliary heat exchanger through a third pipeline, and the secondary side outlet of the auxiliary heat exchanger is connected to the main heat exchanger through a fourth pipeline;

[0007] The third pipeline is provided with a first control valve, and the fourth pipeline is provided with a water supply pump.

[0008] Furthermore, a circulating water pump is provided at the secondary side inlet of the main heat exchanger, and the circulating water pump is located at the downstream side of the fourth pipeline access port.

[0009] Furthermore, a drain valve group for draining water and blocking steam is arranged on the first pipeline.

[0010] Furthermore, a second control valve is provided on the second pipeline.

[0011] Furthermore, the primary side outlet of the auxiliary heat exchanger is connected to the condensate recovery equipment through a fifth pipeline, and a third control valve is provided on the fifth pipeline.

[0012] Furthermore, the condensate recovery equipment is a boiler.

[0013] Furthermore, the first control valve is capable of controlling flow.

[0014] Furthermore, the lower end of the overflow pipe of the water replenishing tank is inserted into the water sealing device.

[0015] Furthermore, the main heat exchanger is a shell and tube heat exchanger, and the auxiliary heat exchanger is a plate heat exchanger.

[0016] The beneficial effects of the utility model are:

[0017] The embodiment of the present application provides a heat exchange unit that uses waste heat to eliminate white smoke. By connecting an auxiliary heat exchanger in series at the heat source outlet of the main heat exchanger, the condensed water and the make-up water are heat-exchanged in the auxiliary heat exchanger, and the make-up water is heated by the waste heat of the condensed water. In this way, not only can the temperature of the condensed water be reduced, thereby solving the problem of white smoke emitted by the traditional heat exchange station due to the high temperature of the condensed water, but the make-up water can also be preheated to ensure the temperature of the water supply of the second network, avoid fluctuations in the temperature of the water supply of the second network, and provide reliable protection for user heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a heat exchanger unit utilizing waste heat for descaling is provided in an embodiment of the present application.

[0019] In the figure: 1. Main heat exchanger;

[0020] 2. Auxiliary heat exchanger;

[0021] 3. Heating network;

[0022] 41, first pipeline; 411, steam trap group; 42, second pipeline; 421, second control valve; 43, third pipeline; 431, first control valve; 44, fourth pipeline; 441, water supply pump; 45, fifth pipeline; 451, third control valve;

[0023] 5. Water supply tank; 51. Overflow pipe;

[0024] 6. Circulating water pump;

[0025] 7. Water seal device;

[0026] 8. Filter. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described in detail below in conjunction with the drawings in the embodiments of the present application, and the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by those skilled in the art without creative work on the basis of the embodiments of the present application shall belong to the protection scope of the present application.

[0028] like Figure 1 As shown, a heat exchange unit utilizing waste heat for descaling includes a main heat exchanger 1 and an auxiliary heat exchanger 2. The secondary side inlet of the main heat exchanger 1 is connected to the return water port of the heating network 3, and the secondary side outlet of the main heat exchanger 1 is connected to the water inlet of the heating network 3. The primary side inlet of the main heat exchanger 1 is connected to the outlet of the boiler that generates heating steam, the secondary side outlet of the main heat exchanger 1 is connected to the primary side inlet of the auxiliary heat exchanger 2 through a first pipeline 41, and the primary side outlet of the auxiliary heat exchanger 2 is connected to the inlet of the water supply tank 5 through a second pipeline 42. The outlet of the water supply tank 5 is connected to the secondary side inlet of the auxiliary heat exchanger 2 through a third pipeline 43, and the secondary side outlet of the auxiliary heat exchanger 2 is connected to the secondary side inlet of the main heat exchanger 1 through a fourth pipeline 44.

[0029] The third pipeline 43 is provided with a first control valve 431 for controlling the on-off of the third pipeline 43 , and the fourth pipeline 44 is provided with a water supply pump 441 .

[0030] During operation, steam enters the main heat exchanger 1 and exchanges heat with the circulating water in the heating network 3. The condensed water generated after the steam heat exchange will flow out from the primary side outlet of the main heat exchanger 1 and enter the primary side of the auxiliary heat exchanger 2 through the first pipeline 41. At the same time, the make-up water in the make-up water tank 5 will enter the secondary side of the auxiliary heat exchanger 2 through the third pipeline 43. After the condensed water and the make-up water exchange heat in the auxiliary heat exchanger 2, the temperature of the condensed water decreases and enters the make-up water tank 5 through the second pipeline 42. After the heat exchange of the make-up water, the temperature of the condensed water increases and enters the heating network 3 through the fourth pipeline 44 and the make-up water pump 441 provided on the fourth pipeline 44, thereby replenishing the circulating water in the heating network 3.

[0031] Furthermore, a circulating water pump 6 for providing power for water circulation in the heating network 3 is located downstream of the inlet of the fourth pipeline 44. As a specific implementation, the secondary outlet of the auxiliary heat exchanger 2 in this embodiment is connected to the inlet of the circulating water pump 6 through the fourth pipeline 44.

[0032] The purpose of this design is to ensure the stability of the water flow rate supplied to the main heat exchanger 1. The inlet of the fourth pipeline 44 is set at the upstream side of the circulating water pump 6, so that the make-up water pump 441 only supplies water to the upstream side of the circulating water pump 6, and the actual flow rate of water entering the main heat exchanger 1 is controlled by the circulating water pump 6, thereby avoiding fluctuations in the water flow rate supplied to the main heat exchanger 1.

[0033] Furthermore, if Figure 1 As shown, the first pipeline 41 is provided with a steam trap group 411, which functions to trap water and block steam, that is, condensed water can enter the auxiliary heat exchanger 2 through the steam trap group 411, while uncondensed steam cannot pass through the steam trap group 411 and is blocked on the upstream side of the steam trap group 411. This can prevent steam loss, improve steam utilization, and avoid energy waste.

[0034] Furthermore, if Figure 1 As shown, the second pipeline 42 is provided with a second control valve 421 for controlling the on-off of the second pipeline 42 .

[0035] Furthermore, if Figure 1 As shown, the primary outlet of the auxiliary heat exchanger 2 is connected to the condensate recovery device through the fifth pipeline 45, and the fifth pipeline 45 is provided with a third control valve 451 for controlling the on-off of the fifth pipeline 45. The primary outlet of the auxiliary heat exchanger 2 is provided with a sampling port.

[0036] As a specific implementation, the condensate recovery equipment described in this embodiment is a boiler, that is, the primary side outlet of the auxiliary heat exchanger 2 is connected to the water inlet of the boiler that generates heating steam through the fifth pipeline 45.

[0037] The condensed water after the secondary cooling is sampled and tested through the sampling port. If the water quality of the condensed water meets the requirements, the second control valve 421 is closed, the third control valve 451 is opened, and the condensed water after the secondary cooling is transported to the boiler through the fifth pipeline 45, completing a steam-water cycle. If the water quality of the condensed water does not meet the requirements, the third control valve 451 is closed, the second control valve 421 is opened, and the condensed water after the secondary cooling is transported to the water supply tank 5 through the second pipeline 42.

[0038] Furthermore, the first control valve 431 can control the flow rate. Thus, when the primary outlet temperature of the auxiliary heat exchanger 2 needs to be adjusted, the outlet temperature of the condensed water can be adjusted by controlling the first control valve 431 to adjust the amount of water replenishment.

[0039] Furthermore, if Figure 1As shown, the lower end of the overflow pipe 51 of the water replenishment tank 5 is inserted into the water seal device 7 to form an overflow water seal. The water seal device 7 can be provided to isolate the water vapor from the outside world, so that even if the condensed water temperature is slightly higher, the water tank will not emit white smoke, providing double protection for the white smoke elimination in the station.

[0040] Furthermore, if Figure 1 As shown, filters 8 are provided at the primary inlet of the main heat exchanger 1, the return water port of the heating pipe network 3 and the secondary inlet of the auxiliary heat exchanger 2. As a specific implementation, the filter 8 described in this embodiment adopts a Y-type filter 8. By providing the filter 8, the flow-through components such as the water pump and valve can be protected, providing a guarantee for reducing the subsequent maintenance.

[0041] Furthermore, the filter 8 provided at the secondary side inlet of the auxiliary heat exchanger 2 is located at the upstream side of the first control valve 431 .

[0042] As a specific implementation, the main heat exchanger 1 described in this embodiment adopts a shell and tube heat exchanger, and the auxiliary heat exchanger 2 adopts a plate heat exchanger. The amount of condensed water generated by the shell and tube heat exchanger is generally not large, and the plate heat exchanger has the advantages of high heat transfer coefficient and small footprint, which is convenient for disassembly, assembly, overhaul and maintenance, so that the plate heat exchanger can achieve the best heat exchange effect and whitening effect with the smallest heat exchange area and the lowest capital investment.

[0043] Other embodiments obtained by those skilled in the art by combining, splitting, reorganizing, etc. the embodiments of the present application on the basis of the embodiments provided in the present application do not exceed the protection scope of the present application.

[0044] The above specific implementation methods have detailed the purpose, technical solutions and beneficial effects of the embodiments of the present application. The above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. That is, any modifications, equivalent substitutions, improvements, etc. made on the basis of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A heat exchange unit utilizing waste heat for de-whitening, characterized in that: It comprises an auxiliary heat exchanger (2) and a main heat exchanger (1) connected to a heating network (3); the secondary side outlet of the main heat exchanger (1) is connected to the primary side inlet of the auxiliary heat exchanger (2) through a first pipeline (41); the primary side outlet of the auxiliary heat exchanger (2) is connected to the inlet of a water supply tank (5) through a second pipeline (42); the outlet of the water supply tank (5) is connected to the secondary side inlet of the auxiliary heat exchanger (2) through a third pipeline (43); and the secondary side outlet of the auxiliary heat exchanger (2) is connected to the main heat exchanger (1) through a fourth pipeline (44); The third pipeline (43) is provided with a first control valve (431), and the fourth pipeline (44) is provided with a water replenishment pump (441).

2. A heat exchange unit utilizing waste heat for de-whitening according to claim 1, characterized in that: A circulating water pump (6) is provided at the secondary side inlet of the main heat exchanger (1), and the circulating water pump (6) is located at the downstream side of the inlet of the fourth pipeline (44).

3. A heat exchange unit utilizing waste heat for de-whitening according to claim 1, characterized in that: The first pipeline (41) is provided with a steam trap valve group (411) for draining water and blocking steam.

4. A heat exchange unit utilizing waste heat for de-whitening according to claim 1, characterized in that: The second pipeline (42) is provided with a second control valve (421).

5. A heat exchange unit utilizing waste heat for de-whitening according to claim 4, characterized in that: The primary side outlet of the auxiliary heat exchanger (2) is connected to the condensate recovery equipment via a fifth pipeline (45), and a third control valve (451) is provided on the fifth pipeline (45).

6. A heat exchange unit utilizing waste heat for de-whitening according to claim 5, characterized in that: The condensate recovery equipment is a boiler.

7. The heat exchange unit utilizing waste heat for de-whitening according to claim 1, characterized in that: The first control valve (431) is capable of controlling flow rate.

8. The heat exchange unit utilizing waste heat for de-whitening according to claim 1, characterized in that: The lower end of the overflow pipe (51) of the water replenishment tank (5) is inserted into the water seal device (7).

9. The heat exchange unit utilizing waste heat for de-whitening according to claim 1, characterized in that: The main heat exchanger (1) is a shell and tube heat exchanger, and the auxiliary heat exchanger (2) is a plate heat exchanger.

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