Heat exchange station based on flue gas condensate recovery system

Abstract

The utility model provides a heat exchange station based on a flue gas condensate water recovery system, which comprises a primary pipe network and a secondary pipe network, and the primary pipe network is communicated with the flue gas condensate water recovery system; the highest point of primary pressure in the primary pipe network is communicated with the lowest point of secondary pressure in the secondary pipe network through the first pipeline, and condensate water in the primary pipe network can flow to the secondary pipe network through the first pipeline so as to supplement water to the secondary pipe network, so that the requirement for tap water is reduced, and water resources and operation cost are saved. Besides, a controller is arranged in the heat exchange station and can determine a water replenishing mode according to the water pressure of a water replenishing constant pressure point in the secondary water return main pipe, so that automatic control switching of the condensate water replenishing mode and the tap water replenishing mode is achieved, and it is guaranteed that the water replenishing amount of the two networks is sufficient. The heat exchange station provided by the utility model can realize accurate regulation and control of condensate water replenishing on the premise of ensuring stable operation of heat supply, and a control system is high in intelligent level and remarkable in energy-saving effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of heating, and specifically relates to a heat exchange station based on a flue gas condensate water recovery system. Background Art

[0002] In the heating industry, gas-fired boilers offer advantages over coal-fired boilers, such as lower pollution and higher thermal efficiency. Consequently, they have largely replaced coal-fired boilers as the primary heat source. During natural gas combustion in a boiler, approximately 92% of the energy is converted into heat, approximately 1% is lost as surface heat, and the remaining 7% is lost as exhaust heat. Therefore, recovering flue gas waste heat is a top priority for clean, energy-efficient gas boiler retrofits. This flue gas waste heat recovery process generates a significant amount of condensate, but existing technologies fail to fully recycle this condensate. Instead, the excess condensate, after being used to replenish the primary network, is directly discharged into the municipal sewage network, resulting in a waste of water resources. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the present invention provides a heat exchange station based on a flue gas condensate water recovery system, comprising a primary pipe network and a secondary pipe network, wherein the primary pipe network is connected to the flue gas condensate water recovery system; the highest primary pressure point in the primary pipe network is connected to the lowest secondary pressure point in the secondary pipe network through a first pipe, and the condensed water in the primary pipe network can flow to the secondary pipe network through the first pipe to replenish the secondary pipe network, thereby reducing the demand for tap water and saving water resources and operating costs. In addition, a controller is provided in the heat exchange station, which can determine the replenishment method according to the water pressure at the replenishment constant pressure point in the secondary return water main, so as to realize automatic control switching between condensate water replenishment and tap water replenishment, and ensure sufficient water replenishment in the two networks. The heat exchange station provided by the present invention can realize precise regulation of condensate water replenishment under the premise of ensuring smooth operation of the heating supply, and the control system has a high level of intelligence and significant energy-saving effect.

[0004] To achieve the above-mentioned and other related purposes, the present invention provides a heat exchange station based on a flue gas condensate water recovery system, comprising a primary pipe network and a secondary pipe network, which exchange heat through a heat exchanger, wherein the primary pipe network is connected to the flue gas condensate water recovery system;

[0005] The primary pipe network includes a primary return water main and a primary water inlet main, the secondary pipe network includes a secondary return water main and a secondary water inlet main, and the primary return water main is connected to the secondary return water main through a first pipe, and a solenoid valve is provided on the first pipe; a pressure sensor is provided on the secondary return water main, and the pressure sensor is located downstream of the intersection of the first pipe and the secondary return water main.

[0006] Optionally, a first ball valve and a second ball valve are further provided on the first pipeline, the first ball valve is located between the primary return water main pipe and the solenoid valve, and the second ball valve is located between the solenoid valve and the secondary return water main pipe.

[0007] Optionally, the inflow end of the first ball valve is connected to the outflow end of the second ball valve via a second pipeline, and a third ball valve is provided on the second pipeline.

[0008] Optionally, a two-network circulation pump is provided between the pressure sensor and the heat exchanger.

[0009] Optionally, the secondary return water main is further connected to a third pipeline, and the third pipeline is used to transport tap water to the secondary return water main. The intersection of the third pipeline and the secondary return water main is located upstream of the pressure sensor.

[0010] Optionally, a softening tank, a softened water tank and a water supply pump are sequentially provided from the inflow end to the outflow end of the third pipeline.

[0011] Optionally, the heat exchange station further includes a controller, which is communicatively connected to the solenoid valve, the water supply pump and the pressure sensor.

[0012] Optionally, a secondary circulation pump is provided on the primary return water main pipe, and the secondary circulation pump is located upstream of the intersection of the first pipeline and the primary return water main pipe.

[0013] The heat exchange station based on the flue gas condensate water recovery system provided by the present invention has at least the following beneficial effects:

[0014] 1) The condensed water in the primary return water main can flow to the secondary return water main through the first pipeline to replenish the secondary pipe network, thereby reducing the demand for tap water, saving water resources and operating costs;

[0015] 2) The controller can determine the water replenishment method based on the water pressure at the lowest point in the secondary return water main, so as to realize automatic control switching between condensate water replenishment and tap water replenishment, and ensure sufficient water replenishment in the secondary network;

[0016] 3) Under the premise of ensuring stable operation of heating, precise control of condensate water replenishment is achieved, the control system has a high level of intelligence and significant energy-saving effect;

[0017] 4) The on-site automatic control system realizes data collection and transmission, automatic calculation and issuance of control instructions, which greatly saves labor costs and has strong system security. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a diagram showing the working principle of a heat exchange station provided in an embodiment.

[0019] Figure 2 The flowchart of the heat exchange station provided in the embodiment is shown.

[0020] Component number description

[0021] 100 Flue gas condensate recovery system

[0022] 101 Primary return water main

[0023] 102 Primary water inlet main

[0024] 201 Secondary return water main

[0025] 202 Secondary water inlet main

[0026] 3 Heat exchanger

[0027] 41 First pipeline

[0028] 42 Second pipeline

[0029] 43 Third pipeline

[0030] 5. Solenoid valve

[0031] 61 First Ball Valve

[0032] 62 Second ball valve

[0033] 63 Third ball valve

[0034] 64 Fourth ball valve

[0035] 7. Pressure sensor

[0036] 8 Second network circulation pump

[0037] 9 Softening tank

[0038] 10 Softened water tank

[0039] 11 Water supply pump

[0040] 12 Controller

[0041] 13. Primary network and secondary circulation pump DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention.

[0043] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Although the illustrations only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation, the form, quantity, positional relationship and proportion of each component in actual implementation can be changed at will under the premise of realizing the technical solution of this party, and the component layout form may also be more complicated.

[0044] Example

[0045] This embodiment provides a heat exchange station based on a flue gas condensate water recovery system, such as Figure 1 As shown, it includes a primary pipe network and a secondary pipe network, which exchange heat through a heat exchanger 3.

[0046] like Figure 1 As shown, the primary pipe network includes a primary return water main 101 and a primary water inlet main 102. The primary pipe network is the high-temperature hot water or steam transmission network from the heat source to the thermal power station in the centralized heating system, responsible for efficiently transferring heat to users. As an example, the primary pipe network is connected to the flue gas condensate recovery system 100. In this embodiment, the flue gas condensate recovery system 100 can recycle and utilize the condensate generated by flue gas waste heat recovery, and the condensate is collected in the primary return water main 101. Excess condensate can be transported through the primary return water main 101 to the heat exchange station provided in this embodiment as make-up water for the secondary pipe network, thereby reducing the demand for tap water, saving water resources and operating costs.

[0047] like Figure 1 As shown, the secondary pipe network includes a secondary return main 201 and a secondary inlet main 202. The secondary pipe network is the heating pipe network that supplies heat from the thermal power station to the user end. As an example, the high-temperature hot water or steam provided by the primary pipe network exchanges heat with the water in the secondary pipe network through a heat exchanger 3 in the thermal power station. The heat is then transferred to the secondary pipe network and delivered to the user end for heating or other purposes.

[0048] like Figure 1 As shown, heat exchanger 3 transfers heat from high-temperature hot water or steam in the primary network to the secondary network. By precisely controlling temperature and flow, it ensures that heat energy is effectively distributed to each user, meeting heating or hot water supply needs while ensuring safe and stable system operation. Heat exchanger 3 can be, for example, a plate heat exchanger, shell and tube heat exchanger, or other type. In this embodiment, a plate heat exchanger is used for heat exchanger 3.

[0049] like Figure 1As shown, the primary return water main pipe 101 is connected to the secondary return water main pipe 201 via a first pipe 41. A solenoid valve 5 is provided on the first pipe 41 to control the opening and closing of the first pipe 41. Since the condensed water generated by the flue gas condensate recovery system 100 is collected in the primary return water main pipe 101, the highest primary pressure point in the primary pipe network and the lowest secondary pressure point in the secondary pipe network are connected via the first pipe 41. Excess condensed water can flow through the first pipe 41 into the secondary return water main pipe 201, thereby replenishing the secondary pipe network through the pressure differential.

[0050] like Figure 1 As shown, the first pipeline 41 is also provided with a first ball valve 61 and a second ball valve 62. The first ball valve 61 is located between the primary return water main pipe 101 and the solenoid valve 5, and the second ball valve 62 is located between the solenoid valve 5 and the secondary return water main pipe 201. In the event of a malfunction of the solenoid valve 5, the first pipeline 41 is closed by the first and second ball valves 61, 62, allowing the solenoid valve 5 to be removed for repair, thus ensuring safe and efficient operation of the station system.

[0051] like Figure 1 As shown, the inflow end of the first ball valve 61 and the outflow end of the second ball valve 62 are connected via a second pipe 42, and a third ball valve 63 is provided on the second pipe 42. When the first pipe 41 is closed, the second pipe 42 can be opened via the third ball valve 63, and the condensed water in the primary return water main pipe 101 flows into the secondary return water main pipe 201 through the second pipe 42, thus also replenishing the secondary pipe network.

[0052] like Figure 1 As shown, a pressure sensor 7 is provided on the secondary return water main pipe 201. As an example, the pressure sensor 7 is located downstream of the intersection of the first pipeline 41 and the secondary return water main pipe 201. This is the point where the water pressure on the secondary return water main pipe 201 is the lowest. By measuring the pressure value at this point, it can be determined whether the secondary return water main pipe 201 needs water replenishment.

[0053] As an example, a secondary network circulation pump 8 is provided between the pressure sensor 7 and the heat exchanger 3 for pumping the water flow in the secondary return water main pipe 201 to the heat exchanger 3 .

[0054] like Figure 1 As shown, a secondary circulation pump 13 is provided on the primary return water main pipe 101. The secondary circulation pump 13 is located upstream of the intersection of the first pipeline 41 and the primary return water main pipe 101, and is used to pump the water flow in the heat exchanger 3 to the primary return water main pipe 101.

[0055] like Figure 1As shown, the secondary return water main pipe 201 is also connected to the third pipe 43, which is used to transport tap water to the secondary return water main pipe 201. As an example, the intersection of the third pipe 43 and the secondary return water main pipe 201 is located upstream of the pressure sensor 7.

[0056] like Figure 1 As shown, from the inflow end to the outflow end of the third pipeline 43, a softening tank 9, a softened water tank 10, a water supply pump 11, and a fourth ball valve 64 are sequentially arranged. For example, the softening tank 9 is used to hold a softener, which is used to soften tap water; the softened water tank 10 is used to store softened tap water for use as water supply in the secondary pipe network; the water supply pump 11 is used to transport the softened tap water to the secondary return water main 201; and the fourth ball valve 64 is used to control the opening and closing of the third pipeline 43.

[0057] like Figure 1 As shown, the heat exchange station further includes a controller 12, the input end of which is in communication with the pressure sensor 7, and the output end of the controller 12 is in communication with the solenoid valve 5 and the water supply pump 11. As an example, the pressure sensor 7 transmits measured pressure data to the controller 12, and the controller 12 controls the opening and closing of the solenoid valve 5 and the water supply pump 11 based on the pressure data.

[0058] like Figure 2 As shown, the working principle of the heat exchange station based on the flue gas condensate water recovery system provided in this embodiment is as follows:

[0059] First, a first water pressure value P1 and a second water pressure value P2 are set in the controller 12. As an example, the first water pressure value P1 is higher than the second water pressure value P2. In this embodiment, the first water pressure value P1 is 0.05 MPa higher than the second water pressure value P2.

[0060] Then, when the pressure value measured by the pressure sensor 7 is lower than the first water pressure value P1, it indicates that water needs to be added to the secondary return water main pipe 201. Specifically, the controller 12 controls the solenoid valve 5 to open, and the condensed water in the primary return water main pipe 101 flows into the secondary return water main pipe 201, thereby replenishing the secondary pipe network.

[0061] Next, pressure sensor 7 measures the water pressure to determine whether it is higher than a second water pressure value P2. If the water pressure is higher than the second water pressure value P2, water continues to be replenished to the secondary network through the primary return water main 101 until the water pressure exceeds the first water pressure value P1. Controller 12 then controls solenoid valve 5 to close, halting water replenishment to the secondary network. If the water pressure is lower than the second water pressure value P2, controller 12 controls water replenishment pump 11 to open, and tap water is replenished to the secondary network until the water pressure exceeds the first water pressure value P1. Controller 12 then controls solenoid valve 5 and water replenishment pump 11 to close, halting water replenishment to the secondary network.

[0062] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A heat exchange station based on a flue gas condensate water recovery system, characterized in that: It includes a primary pipe network and a secondary pipe network, which exchange heat through a heat exchanger. The primary pipe network is connected to the flue gas condensate water recovery system; The primary pipe network includes a primary return water main and a primary water inlet main, the secondary pipe network includes a secondary return water main and a secondary water inlet main, and the primary return water main is connected to the secondary return water main through a first pipe, and a solenoid valve is provided on the first pipe; a pressure sensor is provided on the secondary return water main, and the pressure sensor is located downstream of the intersection of the first pipe and the secondary return water main.

2. The heat exchange station based on the flue gas condensate recovery system according to claim 1 is characterized in that: The first pipeline is further provided with a first ball valve and a second ball valve. The first ball valve is located between the primary water return main pipe and the solenoid valve, and the second ball valve is located between the solenoid valve and the secondary water return main pipe.

3. The heat exchange station based on the flue gas condensate water recovery system according to claim 2 is characterized in that: The inflow end of the first ball valve is connected to the outflow end of the second ball valve via a second pipeline, and a third ball valve is provided on the second pipeline.

4. The heat exchange station based on the flue gas condensate recovery system according to claim 1, characterized in that: A two-network circulation pump is provided between the pressure sensor and the heat exchanger.

5. The heat exchange station based on the flue gas condensate recovery system according to claim 1, characterized in that: The secondary water return main pipe is also connected to a third pipe, which is used to transport tap water to the secondary water return main pipe. The intersection of the third pipe and the secondary water return main pipe is located upstream of the pressure sensor.

6. The heat exchange station based on the flue gas condensate water recovery system according to claim 5 is characterized in that: From the inflow end to the outflow end of the third pipeline, a softening tank, a softened water tank and a water supply pump are arranged in sequence.

7. The heat exchange station based on the flue gas condensate recovery system according to claim 6 is characterized in that: The heat exchange station further includes a controller, which is communicatively connected with the solenoid valve, the water supply pump and the pressure sensor.

8. The heat exchange station based on the flue gas condensate water recovery system according to claim 1, characterized in that: A secondary circulation pump is provided on the primary return water main pipe, and the secondary circulation pump is located upstream of the intersection of the first pipeline and the primary return water main pipe.

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