Production workshop and boiler room linked heat recovery system

Abstract

This invention relates to the field of heat energy recovery technology, and discloses a heat energy recovery system linking a production workshop and a boiler room. The system includes a first heat exchanger, a second heat exchanger, and a hot water storage tank. Both the first and second heat exchangers have heat exchange medium channels and water flow channels. The condensate from the steam generated in the production workshop flows to the boiler room through the heat exchange medium channel of the first heat exchanger. The flash steam from the condensate flows to the heat exchange medium channel of the second heat exchanger. The water flow channels of both the first and second heat exchangers are connected to the hot water storage tank, allowing the water to circulate between them. The hot water storage tank provides hot water to the CIP (Clean-In-Place) pipeline. This system reduces energy loss, improves energy utilization, eliminates the "white dragon" phenomenon in the steam recovery equipment on the production workshop side, and improves the overall appearance of the plant area.

Description

Technical Field

[0001] This invention relates to the field of heat recovery technology, and in particular to a heat recovery system that links a production workshop with a boiler. Background Technology

[0002] In existing technologies, steam condensate generated in the production workshop is recycled and returned to the boiler room for reuse. However, this results in a noticeable "white dragon" phenomenon in the steam condensate on the recovery side of the production workshop, leading to significant energy waste and a noticeable impact on the overall appearance of the plant. Secondly, steam condensate at approximately 95°C is typically recycled to the boiler room for reuse, while the exhaust gas temperature of the boiler equipment is around 115°C, which also leads to significant energy waste.

[0003] Therefore, there is an urgent need for a heat recovery system that links the production workshop with the boiler room to solve the above technical problems. Summary of the Invention

[0004] The purpose of this invention is to propose a heat recovery system that links the production workshop and the boiler, which can reduce energy loss, improve energy utilization, eliminate the "white dragon" phenomenon of steam recovery equipment on the production workshop side, and improve the overall appearance of the plant area.

[0005] To achieve this objective, the present invention adopts the following technical solution: This invention provides a heat recovery system linking a production workshop and a boiler room, including a first heat exchange device, a second heat exchange device, and a hot water storage tank. Both the first heat exchange device and the second heat exchange device have heat exchange medium channels and water flow channels. The steam condensate generated in the production workshop flows to the boiler room through the heat exchange medium channel of the first heat exchanger, and the flash steam of the steam condensate generated in the production workshop is directed to the heat exchange medium channel of the second heat exchanger. The water flow channels of both the first heat exchanger and the second heat exchanger are connected to the hot water storage tank, and the water flow can circulate between the first heat exchanger and the hot water storage tank. The hot water storage tank is used to provide hot water to the CIP cleaning pipeline.

[0006] Optionally, the production workshop and boiler linkage heat recovery system further includes a steam condensate temporary storage and lifting device, which is connected upstream or downstream of the first heat exchange device. The steam condensate temporary storage and lifting device is used to store steam condensate and lift the kinetic energy of the steam condensate.

[0007] Optionally, the first heat exchanger is located below the production workshop and is connected upstream of the steam condensate temporary storage and lifting equipment; or, The first heat exchanger is located on the same horizontal plane as the production workshop, and the first heat exchanger is connected downstream of the steam condensate temporary storage and lifting equipment.

[0008] Optionally, the steam condensate temporary storage and lifting device has a vent, and a vent pipe is provided at the vent. The vent is connected to the heat exchange medium channel of the second heat exchange device through the vent pipe.

[0009] Optionally, one end of the water flow channel of the first heat exchanger is connected to the outlet of the hot water storage tank via an outlet pipe, and the other end is connected to the inlet of the hot water storage tank via a first inlet pipe; one end of the water flow channel of the first heat exchanger is selectively connected to an external water supply system via a first water supply pipe.

[0010] Optionally, one end of the water flow channel of the second heat exchanger is connected to an external water supply system via a second water supply pipe, and the other end is connected to the inlet of the hot water storage tank via a second water inlet pipe.

[0011] Optionally, the production workshop and boiler room linkage heat recovery system further includes a water supply pipe, which is connected to the water outlet pipe and located upstream of the first water supply pipe. The water supply pipe is used to provide hot water to the CIP cleaning pipeline.

[0012] Optionally, a booster pump is installed on the outlet pipe, and the booster pump is located upstream of the water supply pipe.

[0013] Optionally, a temperature sensor is provided on the hot water storage tank, and the temperature sensor is used to detect the temperature of the liquid inside the hot water storage tank.

[0014] Optionally, a liquid level sensor is installed on the hot water storage tank to detect the liquid level inside the hot water storage tank.

[0015] The beneficial effects of the present invention include at least the following: This invention provides a heat recovery system linking a production workshop and a boiler room, including a first heat exchanger, a second heat exchanger, and a hot water storage tank. Both the first and second heat exchangers have heat exchange medium channels and water flow channels. Steam condensate generated in the production workshop flows to the boiler room through the heat exchange medium channel of the first heat exchanger. Flash steam from the steam condensate flows to the heat exchange medium channel of the second heat exchanger. The water flow channels of both the first and second heat exchangers are connected to the hot water storage tank, allowing water to circulate between them. The hot water storage tank provides hot water to the CIP cleaning pipeline. In specific implementation, the steam condensate generated in the production workshop is not directly recovered to the boiler room. Instead, it is passed to the first heat exchanger for heat exchange. When water flows through the water flow channel of the first heat exchanger, it is heated. The heated water flows to the hot water storage tank, which then replenishes the acid / alkali tank and hot water tank of the CIP cleaning pipeline to ensure the hot water demand of the CIP cleaning pipeline. Furthermore, after the steam condensate undergoes heat exchange in the first heat exchanger, its thermal energy is utilized, avoiding significant energy waste caused by directly recycling the high-temperature steam condensate to the boiler room. Secondly, the steam condensate generated in the production workshop is at a high temperature. If this high-temperature steam condensate is not heat-exchanged in the first heat exchanger, the flash steam will flow to the heat exchange medium channel of the second heat exchanger. This means the flash steam can undergo heat exchange in the second heat exchanger. When water flows through the water flow channel of the second heat exchanger, it can be heated. The heated water then flows to the hot water storage tank. This not only avoids energy waste, but also, after heat exchange in the second heat exchanger, the flash steam is pre-cooled and liquefied. To facilitate the recovery of the liquefied flash steam, the second heat exchanger is installed vertically, and the liquid flows back into the steam condensate recovery path to the boiler room, avoiding a noticeable steam "white dragon" phenomenon on the recovery side and preventing any impact on the overall appearance of the plant area. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the production workshop and boiler room linkage heat recovery system provided in the embodiment of the present invention.

[0017] Figure Labels 1. First heat exchanger; 2. Second heat exchanger; 3. Hot water storage tank; 4. Steam condensate temporary storage and lifting equipment; 401. Breathing pipe; 5. Lifting pump; 101. First water supply pipe; 102. First water inlet pipe; 103. Water outlet pipe; 201. Second water supply pipe; 202. Second water inlet pipe; 301. Water supply pipe; 302. Water supply branch pipe. Detailed Implementation

[0018] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0019] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1As shown, this embodiment provides a production workshop and boiler room linkage heat recovery system, including a first heat exchanger 1, a second heat exchanger 2, and a hot water storage tank 3. Both the first heat exchanger 1 and the second heat exchanger 2 have heat exchange medium channels and water flow channels. The steam condensate generated in the production workshop flows to the boiler room through the heat exchange medium channel of the first heat exchanger 1. The flash steam of the steam condensate generated in the production workshop flows to the heat exchange medium channel of the second heat exchanger 2. The water flow channels of the first heat exchanger 1 and the second heat exchanger 2 are both connected to the hot water storage tank 3. The water flow can circulate between the first heat exchanger 1 and the hot water storage tank 3. The hot water storage tank 3 is used to provide hot water to the CIP cleaning pipeline.

[0024] In practice, the steam condensate generated in the production workshop is not directly recycled to the boiler room. Instead, it is passed to the first heat exchanger 1 for heat exchange. When water flows through the water channel of the first heat exchanger 1, the flowing water is heated. The heated water then flows to the hot water storage tank 3. The hot water stored in the hot water storage tank 3 can then replenish the acid and alkali tanks and hot water tanks of the CIP cleaning pipeline to ensure the hot water demand of the CIP cleaning pipeline. In addition, after the steam condensate undergoes heat exchange in the first heat exchanger 1, the thermal energy of the steam condensate is utilized, avoiding the significant energy waste caused by directly recycling the high-temperature steam condensate to the boiler room. Secondly, the steam condensate generated in the production workshop has a high temperature. If the high-temperature steam condensate is not heat-exchanged in the first heat exchanger 1, the flash steam in the high-temperature steam condensate will flow to the heat exchange medium channel of the second heat exchanger 2. That is, the flash steam can be heat-exchanged in the second heat exchanger 2. When water flows through the water flow channel of the second heat exchanger 2, the flowing water can be heated. The heated water flows to the hot water storage tank 3. This not only avoids energy waste, but also allows the flash steam to be pre-cooled and liquefied after heat exchange in the second heat exchanger 2. In order to facilitate the recovery of the liquefied flash steam, the second heat exchanger 2 is installed vertically. The liquid will flow back into the flow path of the steam condensate recovery to the boiler room, thus avoiding the obvious steam "white dragon" phenomenon on the recovery side equipment and avoiding affecting the overall appearance of the plant area.

[0025] The inlet and outlet of the water flow channel of the first heat exchanger 1 are both connected to the hot water storage tank 3, allowing water to flow between the first heat exchanger 1 and the hot water storage tank 3. This ensures the circulating heating of the water in the hot water storage tank 3, guaranteeing the required hot water temperature for the CIP cleaning pipeline. However, when the hot water storage tank 3 is replenishing water to the CIP cleaning pipeline, the circulating heating between the first heat exchanger 1 and the hot water storage tank 3 is interrupted. The high-temperature steam condensate does not undergo heat exchange within the first heat exchanger 1, and the steam condensate flowing through it still maintains a high temperature. The flash steam generated by this high-temperature steam condensate will then flow to the second heat exchanger 2. If the steam condensate undergoes heat exchange within the first heat exchanger 1, its temperature will decrease, preventing the generation of flash steam that can flow to the second heat exchanger 2. In other words, the first heat exchanger 1 and the second heat exchanger 2 operate alternately. Under normal circumstances, the hot water temperature provided by the hot water storage tank 3 is lower than the actual hot water temperature when the CIP cleaning pipeline is working. The acid and alkali tanks and the hot water tank can reheat the liquid inside. This is faster and more energy-saving than the CIP cleaning pipeline directly heating room temperature water to the hot water temperature required for actual operation.

[0026] Optionally, the integrated heat recovery system between the production workshop and the boiler also includes a steam condensate temporary storage and lifting device 4. This device 4 is connected upstream or downstream of the first heat exchanger 1. It stores the steam condensate and enhances its kinetic energy to ensure sufficient flow through the first heat exchanger 1. The device 4 includes a complete set of storage tanks and pumps to perform both storage and power enhancement functions. This device is an existing system and will not be described in detail here. In practice, when the steam condensate generated in the production workshop has sufficient kinetic energy to flow to the first heat exchanger 1, the first heat exchanger 1 can be located upstream of the steam condensate temporary storage and lifting device 4. Conversely, when the steam condensate generated in the production workshop does not have sufficient kinetic energy to flow to the first heat exchanger 1, the first heat exchanger 1 can be located downstream of the device 4 to enhance its kinetic energy and meet the flow requirements within the first heat exchanger 1.

[0027] When a factory has multiple floors, the production workshop can be located on the upper floors, such as the 5th, 4th, and 3rd floors, while the first heat exchanger 1 can be installed on the 1st floor. That is, the first heat exchanger 1 is located below the production workshop. The first heat exchanger 1 is connected to the upstream of the steam condensate temporary storage and lifting device 4, which can utilize the floor height difference to improve energy efficiency without the need for the steam condensate temporary storage and lifting device 4 to provide the kinetic energy for the steam condensate to flow to the first heat exchanger 1.

[0028] When the factory is a conventional flat-plan factory, the production workshop and the first heat exchanger 1 are both located on the same floor, that is, the first heat exchanger 1 and the production workshop are located on the same horizontal plane. Therefore, the first heat exchanger 1 is connected downstream of the steam condensate temporary storage and lifting device 4. Figure 1 At the dashed box in the diagram, the first heat exchange device 1 is connected to the outlet of the steam condensate temporary storage and lifting device 4, so that the steam condensate temporary storage and lifting device 4 can provide the kinetic energy for the steam condensate to flow to the first heat exchange device 1.

[0029] Optionally, the steam condensate temporary storage and lifting device 4 has a vent, and a vent pipe 401 is installed at the vent. The vent is connected to the heat exchange medium channel of the second heat exchange device 2 through the vent pipe 401. The steam condensate temporary storage and lifting device 4 has a steam condensate temporary storage function, and the steam condensate generated in the production workshop can be temporarily stored inside. The inner cavity of the steam condensate temporary storage and lifting device 4 is connected to the external environment through the vent. When the temperature of the steam condensate stored in the steam condensate temporary storage and lifting device 4 is high, the flash steam generated by the steam condensate can flow through the vent pipe 401 to the heat exchange medium channel of the second heat exchange device 2. The second heat exchange device 2 uses the flash steam to heat the water flow, and the temperature of the flash steam will also decrease after heat exchange. The flash steam will liquefy and then flow back to the steam condensate temporary storage and lifting device 4. Compared with the prior art, where the flash steam is directly discharged into the external environment through the vent, the flash steam in this solution will not produce the "white dragon" phenomenon after flowing out through the vent pipe 401 and the heat exchange medium channel of the second heat exchange device 2.

[0030] Optionally, one end of the water flow channel of the first heat exchanger 1 is connected to an external water supply system via a first water supply pipe 101 and to the outlet of the hot water storage tank 3 via an outlet pipe 103, while the other end is connected to the inlet of the hot water storage tank 3 via a first inlet pipe 102. In specific implementation, the water flow channel of the first heat exchanger 1 and the hot water storage tank 3 are circulated through the outlet pipe 103 and the first inlet pipe 102, forming a first hot water loop. The external water supply system replenishes water to the first hot water loop between the first heat exchanger 1 and the hot water storage tank 3 through the first water supply pipe 101, thereby ensuring a continuous supply of hot water in the hot water storage tank 3. Furthermore, the first water supply pipe 101 and the outlet pipe 103 are connected to the same end of the water flow channel of the first heat exchanger 1, thus preventing ambient temperature water replenished by the external water supply system from flowing directly into the hot water storage tank 3, which could cause a rapid drop in water temperature within the hot water storage tank 3 and affect normal use. The ambient temperature water supplied by the external water supply system first flows into the water flow channel of the first heat exchange device 1. After exchanging heat with the steam condensate, the temperature rises further before it flows into the hot water storage tank 3.

[0031] In other embodiments, only one end of the water flow channel of the first heat exchange device 1 may be connected to the outlet of the hot water storage tank 3 via an outlet pipe 103, and the other end may be connected to the inlet of the hot water storage tank 3 via a first inlet pipe 102. A circulation is formed between the water flow channel of the first heat exchange device 1 and the hot water storage tank 3, that is, the water for heat exchange in the first heat exchange device 1 comes from the hot water storage tank 3, and the water in the hot water storage tank 3 can be replenished by the water flow from the second heat exchange device 2.

[0032] In this embodiment, one end of the water flow channel of the second heat exchanger 2 is connected to the external water supply system through the second water supply pipe 201, and the other end is connected to the inlet of the hot water storage tank 3 through the second water inlet pipe 202. Specifically, the external water supply system replenishes water into the water flow channel of the second heat exchanger 2 through the second water supply pipe 201, thereby ensuring a continuous supply of water for heating in the water flow channel of the second heat exchanger 2. Furthermore, the water replenished into the second heat exchanger 2 by the external water supply system flows to the hot water storage tank 3 and then re-enters the first hot water circuit for recirculation and heating.

[0033] Optionally, the heat recovery system linking the production workshop and boiler room also includes a water supply pipe 301. The water supply pipe 301 is connected to the outlet pipe 103 and located upstream of the first water supply pipe 101. The water supply pipe 301 is used to supply hot water to the CIP cleaning pipeline. In specific implementation, a first valve is installed on the water supply pipe 301. When the first valve is opened, the water flowing out of the outlet pipe 103 can flow to the water supply pipe 301. Multiple water supply branch pipes 302 are installed at the end of the water supply pipe 301 that is not connected to the outlet pipe 103. Each water supply branch pipe 302 is equipped with a second valve. When the second valve is opened, water is supplied to the corresponding hot water supply equipment point through the water supply branch pipe 302. In this embodiment, the hot water supply equipment point is the acid and alkali tank and hot water tank of the CIP cleaning pipeline mentioned above. The number of acid and alkali tanks and hot water pipes is set as needed. In this embodiment, the water supply pipe 301 is connected to the water outlet pipe 103, which reduces the need for multiple pipe connection ports on the hot water storage tank 3. In order to avoid the external water supply system from replenishing water into the first hot water circuit having a significant impact on the water temperature in the hot water storage tank 3, the water supply pipe 301 is connected upstream of the first water supply pipe 101, so that water is used first and then replenished in the first hot water circuit.

[0034] Optionally, a booster pump 5 is installed on the outlet pipe 103, located upstream of the water supply pipe 301. The booster pump 5 is used to increase the kinetic energy of the hot water flowing out of the hot water storage tank 3, so as to ensure that the hot water can flow to each hot water supply equipment point at a preset flow rate.

[0035] Optionally, a flow meter is also installed on the outlet pipe 103. The flow meter is used to monitor the flow rate of hot water flowing out of the hot water storage tank 3 to ensure that the water supply of the hot water storage tank 3 can meet the water demand of the CIP cleaning pipeline.

[0036] Optionally, a temperature sensor is installed on the hot water storage tank 3 to detect the temperature of the liquid inside the hot water storage tank 3. In a specific implementation, solenoid valves are installed on both the first water supply pipe 101 and the second water supply pipe 201. The solenoid valves open or close according to the temperature signal transmitted by the temperature sensor, so that when the water temperature in the hot water storage tank 3 exceeds the preset water temperature, water is supplied through the first water supply pipe 101 and / or the second water supply pipe 201. By increasing the amount of room temperature water entering the circulation heating process, the water temperature in the hot water storage tank 3 is reduced.

[0037] Optionally, a liquid level sensor is installed on the hot water storage tank 3 to detect the liquid level inside the tank. Specifically, the liquid level sensor includes a high-level sensor, which is positioned at the highest safe water level of the hot water storage tank 3, to prompt the user to stop adding water to the tank or to consume the hot water in the tank when the liquid level reaches the highest safe level. The liquid level sensor also includes a low-level sensor, which is positioned at the lowest safe water level of the tank, to prompt the user to continue adding water to the tank when the liquid level reaches the lowest safe level.

[0038] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat recovery system linking the production workshop and boiler room, characterized in that, It includes a first heat exchange device (1), a second heat exchange device (2) and a hot water storage tank (3), wherein the first heat exchange device (1) and the second heat exchange device (2) both have heat exchange medium channels and water flow channels; The steam condensate generated in the production workshop flows to the boiler room through the heat exchange medium channel of the first heat exchange device (1), and the flash steam of the steam condensate generated in the production workshop is directed to the heat exchange medium channel of the second heat exchange device (2). The water flow channels of the first heat exchange device (1) and the second heat exchange device (2) are both connected to the hot water storage tank (3), and the water flow can circulate between the first heat exchange device (1) and the hot water storage tank (3). The hot water storage tank (3) is used to provide hot water to the CIP cleaning pipeline.

2. The production workshop and boiler-linked heat recovery system according to claim 1, characterized in that, The production workshop and boiler linkage heat recovery system also includes a steam condensate temporary storage and lifting device (4). The steam condensate temporary storage and lifting device (4) is connected to the upstream or downstream of the first heat exchange device (1). The steam condensate temporary storage and lifting device (4) is used to store steam condensate and lift the kinetic energy of steam condensate.

3. The production workshop and boiler-connected heat recovery system according to claim 2, characterized in that, The first heat exchanger (1) is located below the production workshop and is connected upstream of the steam condensate temporary storage and lifting device (4); or, The first heat exchange device (1) is located on the same horizontal plane as the production workshop, and the first heat exchange device (1) is connected downstream of the steam condensate temporary storage and lifting device (4).

4. The production workshop and boiler linkage heat recovery system according to claim 2, characterized in that, The steam condensate temporary storage and lifting device (4) has a vent, and a vent pipe (401) is provided at the vent. The vent is connected to the heat exchange medium channel of the second heat exchange device (2) through the vent pipe (401).

5. The production workshop and boiler linkage heat recovery system according to claim 1, characterized in that, One end of the water flow channel of the first heat exchanger (1) is connected to the outlet of the hot water storage tank (3) through the outlet pipe (103), and the other end is connected to the inlet of the hot water storage tank (3) through the first inlet pipe (102); one end of the water flow channel of the first heat exchanger (1) is selectively connected to the external water supply system through the first water supply pipe (101).

6. The production workshop and boiler linkage heat recovery system according to claim 5, characterized in that, One end of the water flow channel of the second heat exchanger (2) is connected to the external water supply system through the second water supply pipe (201), and the other end is connected to the inlet of the hot water storage tank (3) through the second water inlet pipe (202).

7. The production workshop and boiler-linked heat recovery system according to claim 5, characterized in that, The production workshop and boiler room linkage heat recovery system also includes a water supply pipe (301), which is connected to the water outlet pipe (103) and located upstream of the first water supply pipe (101). The water supply pipe (301) is used to provide hot water to the CIP cleaning pipeline.

8. The production workshop and boiler-connected heat recovery system according to claim 7, characterized in that, A booster pump (5) is installed on the water outlet pipe (103), and the booster pump (5) is located upstream of the water supply pipe (301).

9. The production workshop and boiler linkage heat recovery system according to claim 1, characterized in that, A temperature sensor is installed on the hot water storage tank (3) to detect the temperature of the liquid inside the hot water storage tank (3).

10. The production workshop and boiler-connected heat recovery system according to claim 1, characterized in that, A liquid level sensor is installed on the hot water storage tank (3) to detect the liquid level inside the hot water storage tank (3).

Images