Heat recovery expansion water tank type heat exchange unit

Abstract

The utility model discloses a heat recovery type expansion water tank heat exchange unit, which belongs to the field of heating equipment, is used for supplying heat and comprises a heat exchanger, a steam inlet of the heat exchanger is communicated with an external steam pipeline through a steam valve assembly, and a hot water outlet of the heat exchanger is communicated with a heating user pipe network through a hot water pipeline. A water return pipeline of the heating user pipe network communicates with the expansion water tank, and the expansion water tank communicates with a water return opening of the heat exchanger through the circulation valve assembly and the circulation pipeline. Condensate water of the heat exchanger is communicated with an expansion water tank through a condensate water valve assembly and a condensate water pipeline, and the expansion water tank is further communicated with a water supplementing pipe and on-site sewage storage equipment. High-temperature hot water can be recycled, the heat loss and the steam use amount can be greatly reduced, the pressure in the pipeline is kept constant, the heat exchange efficiency is effectively improved, the stability of the production quality is guaranteed, and the operation cost is reduced.

Description

Technical Field

[0001] The present application belongs to the field of heating devices, and more specifically, particularly relates to a heat recovery expansion water tank type heat exchange unit. Background Art

[0002] The current heating systems mostly include plate heat exchangers, expansion water tanks, circulation pumps, control cabinets, etc. See a high-rise building heat exchange zone heating system disclosed in Chinese Patent Publication No. CN104848322A, which is mainly composed of a plate heat exchanger, an expansion water tank, a circulation pump, a direct-connected booster frequency conversion pump, a control cabinet, a heating low zone and a heating high zone. The plate heat exchanger is respectively connected to the primary water supply pipe and the primary return pipe, and the plate heat exchanger is also respectively connected to the low zone heating water supply pipe and the low zone heating return pipe, and the high zone heating water supply pipe and the high zone heating return pipe are respectively connected to the low zone heating water supply pipe and the low zone heating return pipe, and are connected to the heating high zone, and a direct-connected booster frequency conversion pump is installed on the high zone heating water supply pipe.

[0003] However, due to the long-term operation of the equipment, the temperature difference between the water supply and the water outlet of the heat exchanger unit composed of the plate heat exchanger, expansion water tank, etc. is large, the pressure difference between the water inlet and the water outlet is large, and the problem of serious heat loss caused by the high condensate temperature has not been solved. The heat exchange capacity of the heat exchanger unit is insufficient. The insufficient heat exchange capacity will increase the use of steam as a heat source, which will lead to an increase in operating costs. Utility Model Content

[0004] The purpose of the present application is to provide a heat recovery expansion water tank type heat exchanger unit, which can realize the reuse of high-temperature hot water, greatly reduce heat loss and steam usage, maintain a constant pressure inside the pipeline, effectively improve heat exchange efficiency, ensure the stability of production quality, and reduce operating costs.

[0005] To achieve the above objectives, this application is implemented through the following technical solutions:

[0006] The present application discloses a heat recovery expansion water tank type heat exchanger unit, comprising a heat exchanger, wherein the steam inlet of the heat exchanger is connected to an external steam pipeline via a steam valve assembly, the hot water outlet of the heat exchanger is connected to a heating user network via a hot water pipeline, the return water pipeline of the heating user network is connected to an expansion water tank, and the expansion water tank is connected to the return water port of the heat exchanger via a circulation valve assembly and a circulation pipeline; the condensed water of the heat exchanger is connected to the expansion water tank via a condensed water valve assembly and a condensed water pipeline, and the expansion water tank is also connected to a water supply pipe and on-site sewage storage equipment.

[0007] As one of the preferred technical solutions of the present application, the steam valve assembly includes a first butterfly valve, an electric regulating valve, and a second butterfly valve installed in series in the direction of medium flow inside the steam pipeline. The electric regulating valve is connected to the controller and the sensor through an electrical signal. The sensor is installed in the hot water pipeline connecting the heat exchanger and the heating user pipeline network.

[0008] As one of the preferred technical solutions of the present application, a third butterfly valve connected in parallel with the first butterfly valve, the electric regulating valve and the second butterfly valve is also installed on the steam pipeline.

[0009] As one of the preferred technical solutions of the present application, the condensate valve assembly includes a first ball valve, a steam trap, and a second ball valve which are connected in series in sequence along the flow direction of the medium inside the condensate pipeline.

[0010] As one of the preferred technical solutions of the present application, the condensate valve assembly is also equipped with a third ball valve arranged in parallel with the first ball valve, the steam trap and the second ball valve.

[0011] As one of the preferred technical solutions of the present application, the circulation valve assembly includes a fourth butterfly valve, a first silencer check valve, a hot water circulation pump, a second silencer check valve, and a fifth butterfly valve which are installed in series in the flow direction of the medium inside the circulation pipeline.

[0012] As one of the preferred technical solutions of the present application, the heat exchanger is a plate heat exchanger.

[0013] Compared with the prior art, the beneficial effects of this application are:

[0014] In the present application, the expansion water tank can send the soft water sent into the expansion water tank through the water supply pipe, the steam condensate generated after the steam is exchanged with the heat exchanger, and the recovered water generated by the heating user pipeline network into the heat exchanger, and perform secondary heating through the heat exchanger. The hot water generated after heating is used to supply heating for residential, industrial production and other occasions, and the return water generated by the heating user pipeline network enters the expansion water tank again for heat source recovery.

[0015] The electric regulating valve, hot water circulation pump, controller, etc. in this application are all connected to the electric control cabinet through electrical signals, and fully automatic control is achieved through the electric control cabinet.

[0016] The present application can realize the repeated recycling of high-temperature hot water, which can greatly reduce the heat loss and the use of steam required for heating. In addition, it can maintain a constant pressure in the pipeline during the heating process, effectively improve the heat exchange efficiency, ensure the stability of hot water production quality, and help reduce the operating cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the system structure of this application.

[0018] In the figure: 1. heat exchanger; 2. first butterfly valve; 3. electric regulating valve; 4. second butterfly valve; 5. third butterfly valve; 6. first ball valve; 7. steam trap; 8. second ball valve; 9. third ball valve; 10. expansion tank; 11. fourth butterfly valve; 12. first silencer check valve; 13. hot water circulation pump; 14. second silencer check valve; 15. fifth butterfly valve; 16. controller; 17. sensor; 18. heating user pipe network. DETAILED DESCRIPTION

[0019] The technical solution described in this application is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Example 1

[0021] like Figure 1 As shown, a heat recovery expansion water tank type heat exchange unit includes a heat exchanger 1, the steam inlet of the heat exchanger 1 is connected to the steam pipeline through a steam valve assembly, and the steam valve assembly includes a first butterfly valve 2, an electric regulating valve 3, and a second butterfly valve 4 that are sequentially connected in series along the direction of steam movement. The electric regulating valve 3 is connected to a controller 16 through an electric signal, and the controller 16 is also connected to a sensor 17 through an electric signal. The sensor 17 is located on the hot water pipeline at the hot water outlet of the heat exchanger 1. The controller 16 is a single chip microcomputer or a microcomputer, which is used to receive the electric signal from the sensor 17 and feed it back to the electric regulating valve 3 after processing. The sensor 17 is a temperature sensor.

[0022] The heat exchanger 1 is connected to the inlet of the heating user pipe network 18 through a hot water pipeline, and the return water port of the heating user pipe network 18 is connected to the expansion water tank 10 through a pipeline. The expansion water tank 10 is connected to the heat exchanger 1 through a circulation pipeline with a circulation valve assembly.

[0023] The circulation valve assembly comprises a fourth butterfly valve 11, a first silencer check valve 12, a hot water circulation pump 13, a second silencer check valve 14, and a fifth butterfly valve 15 which are sequentially arranged in series along the flow direction of the medium in the circulation pipeline.

[0024] The heat exchanger 1 generates condensed water during the heat exchange process, and the condensed water is connected to the expansion water tank 10 through a condensed water pipeline with a condensed water valve assembly. The condensed water valve assembly includes a first ball valve 6, a steam trap 7, and a second ball valve 8 arranged in sequence along the flow direction of the medium inside the condensed water pipeline.

[0025] The expansion water tank 10 is also connected to a water supply pipe and an on-site sewage storage device.

[0026] Example 2

[0027] Based on the above embodiments, continue to refer to Figure 1, a heat recovery type expansion water tank type heat exchange unit, including a third butterfly valve 5, the third butterfly valve 5 and the first butterfly valve 2, the electric regulating valve 3, and the second butterfly valve 4 are all arranged in parallel, that is, the inlet side of the third butterfly valve 5 is located at the inlet side of the first butterfly valve 2, and the outlet side of the third butterfly valve 5 is located at the outlet side of the second butterfly valve 4. It also includes a third ball valve 9, the third ball valve 9 and the first ball valve 6, the steam trap 7, and the second ball valve 8 are all arranged in parallel, that is, the inlet of the third ball valve 9 is located at the inlet side of the first ball valve 6, and the outlet of the third ball valve 9 is located at the outlet side of the second ball valve 8. The structure and connection relationship of the remaining parts are the same as the structure and connection relationship described in any one of the aforementioned embodiments, and in order to avoid cumbersome text, they are not repeated here.

[0028] Based on the above embodiments, the following paragraphs will continue to describe in detail the technical features involved and the functions and roles played by the technical features in the present technical solution, so as to help technicians in this field to fully understand the technical solution and reproduce it.

[0029] The third butterfly valve 5 described in the present application can ensure the continuous operation of the equipment under emergency conditions, and the third ball valve 9 can achieve communication with the expansion water tank 10 under emergency conditions.

[0030] For example, the temperature of hot water sent to the heating user network 18 through the hot water pipeline is 90°C. The hot water circulates in the heating user network 18 to heat the heating user. After passing through the heating user network 18, the return water temperature of the return water pipeline is reduced to about 70°C. The return water at this temperature enters the expansion water tank 10 and mixes with the soft water added in the expansion water tank 10 and the condensed water generated by the heat exchanger 1 to achieve heat source recovery. The 20°C temperature difference between the heat exchanger 1 and the heating user network 18 realizes the step-by-step utilization of high-temperature media, meets the heating hot water demand of the required temperature for production, reduces the loss of heat and steam, and helps save operating costs.

[0031] In the present application, the controller 16 can be electrically connected to the sensor 17 on the hot water pipeline, and the steam supply amount can be adjusted through the electric regulating valve 3, thereby adjusting the temperature of the heat exchanger.

[0032] In the present application, a liquid level gauge is provided in the expansion water tank 10, and the water level in the expansion water tank 10 is measured by the liquid level gauge. The liquid level gauge is connected to the corresponding controller in the control cabinet through an electrical signal, and the controller is connected to the solenoid valve located on the water supply pipe through an electrical signal. The water supply operation of the water supply pipe to the expansion water tank 10 is realized by opening and closing the solenoid valve.

[0033] Finally, although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A heat recovery expansion water tank type heat exchange unit, comprising a heat exchanger (1), wherein a steam inlet of the heat exchanger (1) is connected to an external steam pipeline via a steam valve assembly, and a hot water outlet of the heat exchanger (1) is connected to a heating user pipe network (18) via a hot water pipeline, characterized in that: The return water pipeline of the heating user pipe network (18) is connected to the expansion water tank (10), and the expansion water tank (10) is connected to the return water port of the heat exchanger (1) through the circulation valve assembly and the circulation pipeline; the condensed water of the heat exchanger (1) is connected to the expansion water tank (10) through the condensed water valve assembly and the condensed water pipeline, and the expansion water tank (10) is also connected to a water supply pipe and on-site sewage storage equipment.

2. A heat recovery expansion water tank type heat exchanger unit according to claim 1, characterized in that: The steam valve assembly comprises a first butterfly valve (2), an electric regulating valve (3), and a second butterfly valve (4) which are sequentially installed in series in the direction of flow of the medium inside the steam pipeline. The electric regulating valve (3) is connected to a controller (16) and a sensor (17) via an electrical signal. The sensor (17) is installed in a hot water pipeline connecting the heat exchanger (1) and a heating user pipeline network (18).

3. A heat recovery expansion water tank type heat exchange unit according to claim 2, characterized in that: The steam pipeline is also provided with a third butterfly valve (5) connected in parallel with the first butterfly valve (2), the electric regulating valve (3), and the second butterfly valve (4).

4. The heat recovery expansion water tank type heat exchanger unit according to claim 1, characterized in that: The condensate valve assembly comprises a first ball valve (6), a steam trap (7), and a second ball valve (8) which are connected in series in sequence along the flow direction of the medium inside the condensate pipeline.

5. A heat recovery expansion water tank type heat exchange unit according to claim 4, characterized in that: The condensate valve assembly is also provided with a third ball valve (9) which is arranged in parallel with the first ball valve (6), the steam trap (7), and the second ball valve (8).

6. The heat recovery expansion water tank type heat exchanger unit according to claim 1, characterized in that: The circulation valve assembly comprises a fourth butterfly valve (11), a first silencer check valve (12), a hot water circulation pump (13), a second silencer check valve (14), and a fifth butterfly valve (15), which are sequentially installed in series in the flow direction of the medium in the circulation pipeline.

7. A heat recovery expansion water tank type heat exchanger unit according to any one of claims 1 to 6, characterized in that: The heat exchanger (1) is a plate heat exchanger.

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