Low-temperature hot water comprehensive utilization device

Abstract

The utility model discloses a low-temperature hot water comprehensive utilization device. The problem that existing low-temperature heat cannot be reasonably utilized, and consequently system energy consumption is high is solved. A low-temperature hot water tank; a high-temperature hot water tank; the first hot water pipe network is provided with a low-temperature hot water pump, and the low-temperature hot water pump is used for conveying low-temperature hot water in the low-temperature hot water tank to the high-temperature hot water tank; the first heat exchanger is arranged at the first hot water pipe network and used for heating 65-75 DEG C low-temperature hot water to 90-95 DEG C and enabling the hot water to enter the high-temperature hot water tank; the second hot water pipe network is provided with a high-temperature hot water pump, and the high-temperature hot water pump is used for conveying high-temperature hot water in the high-temperature hot water tank into the low-temperature hot water tank; and the second heat exchanger is arranged at the second hot water pipe network and used for using the high-temperature hot water conveyed by the high-temperature hot water tank. The utility model also has the advantages of simple structure, convenience in assembly, long service life, reduced system energy consumption and the like.

Description

Technical Field

[0001] The utility model relates to the field of petrochemical industry, in particular to a low-temperature hot water comprehensive utilization device. Background Art

[0002] The petrochemical industry, often abbreviated as petrochemicals, generally refers to the chemical industry that uses petroleum and natural gas as raw materials. The petroleum refining process refers to the various processes employed within the industry, and various combinations of these processes constitute the bulk of different types of refineries. The petroleum refining process is conventionally loosely categorized into primary, secondary, and tertiary processes. During the production process, petrochemical enterprises inevitably generate some low-temperature heat, typically around 70°C. This low-temperature heat cannot be directly utilized. If this low-temperature heat is directly cooled through air or water cooling, energy is not utilized effectively, resulting in wasted energy and high system energy consumption. Utility Model Content

[0003] In order to solve the problem in the background technology that low-temperature heat cannot be reasonably utilized, resulting in high system energy consumption, the utility model provides a low-temperature hot water comprehensive utilization device.

[0004] The technical solution of the utility model is: a low-temperature hot water comprehensive utilization device, comprising:

[0005] Low-temperature hot water tank, used to store and output low-temperature hot water at 65-75 degrees;

[0006] High-temperature hot water tank, used to store and output high-temperature hot water at 90-95 degrees;

[0007] a first hot water pipe network, wherein a low-temperature hot water pump is provided on the first hot water pipe network, and the low-temperature hot water pump is used to transport the low-temperature hot water in the low-temperature hot water tank to the high-temperature hot water tank;

[0008] The first heat exchanger is installed at the first hot water pipe network to heat the low-temperature hot water of 65-75 degrees to 90-95 degrees and enter the high-temperature hot water tank;

[0009] a second hot water pipe network, wherein a high-temperature hot water pump is provided on the second hot water pipe network, and the high-temperature hot water pump is used to transport the high-temperature hot water in the high-temperature hot water tank to the low-temperature hot water tank;

[0010] The second heat exchanger is arranged at the second hot water pipe network and is used to use the high-temperature hot water delivered by the high-temperature hot water tank.

[0011] As a further improvement of the present invention, it further includes a third hot water pipe network, which is arranged between the high-temperature hot water tank and the low-temperature hot water tank, and is arranged in parallel with the second heat exchanger.

[0012] As a further improvement of the present invention, it also includes a waste heat steam generation facility, which is arranged on the third hot water pipe network and is used to vaporize high-temperature hot water into steam for output.

[0013] As a further improvement of the present invention, the waste heat steam generation facility is connected to the first low-pressure steam network and outputs 120-150 degree steam.

[0014] As a further improvement of the present invention, the waste heat steam generating facility is connected to the vacuum pump and outputs 180-200 degree steam to the second low-pressure steam network.

[0015] As a further improvement of the present invention, it also includes an opening and closing valve, which is arranged on the third hot water pipe network, and is used to control the high-temperature hot water in the high-temperature hot water tank to enter the waste heat steam generation facility and give priority to meeting the needs of the second heat exchanger.

[0016] As a further improvement of the present invention, a detector is further included for detecting the temperature of the water entering the low-temperature hot water tank.

[0017] As a further improvement of the present invention, it also includes a circulating water cooler, which cooperates with the detector to automatically adjust the flow rate of the circulating water according to the temperature change of the detector to ensure the stability of the external water supply temperature.

[0018] As a further improvement of the present invention, it also includes a flare system, which is respectively connected to the tank tops of the low-temperature hot water tank and the high-temperature hot water tank, and is used to remove the gaseous components in the low-temperature hot water tank and the high-temperature hot water tank and prevent the low-temperature hot water pump and the high-temperature hot water pump from being evacuated.

[0019] As a further improvement of the present invention, it also includes a pressure replenishing device, which is connected to the low-temperature hot water tank and the high-temperature hot water tank respectively, and replenishes pressure through nitrogen to ensure the stability of the inlet pressure of the low-temperature hot water pump and the high-temperature hot water pump.

[0020] The beneficial effect of this utility model is that after the low-temperature hot water is pressurized by the low-temperature hot water pump, it enters the first hot water network, undergoes sufficient heat exchange with the first heat exchanger, raising the hot water temperature to 90-95°C, and then enters the high-temperature hot water tank. The high-temperature hot water pump is then transported to the second hot water network to fully utilize the heat, rationally utilize the low-temperature hot water, improve energy utilization, and reduce system energy consumption. The utility model also has the advantages of simple structure, easy assembly, long service life, and reduced system energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attachment Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0022] In the figure, 1. Low-temperature hot water tank; 2. High-temperature hot water tank; 3. First hot water pipeline network; 4. Low-temperature hot water pump; 5. First heat exchanger; 6. Second hot water pipeline network; 7. High-temperature hot water pump; 8. Second heat exchanger; 9. Third hot water pipeline network; 10. Waste heat steam generation facility; 11. First low-pressure steam pipeline network; 12. Vacuum pump; 13. Second low-pressure steam pipeline network; 14. On-off valve; 15. Detector; 16. Circulating water cooler. DETAILED DESCRIPTION

[0023] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0024] Depend on Figure 1 As shown, a low-temperature hot water comprehensive utilization device includes:

[0025] Low-temperature hot water tank 1, used to store and output low-temperature hot water at 65-75 degrees;

[0026] High temperature hot water tank 2, used to store and output high temperature hot water at 90-95 degrees;

[0027] a first hot water pipe network 3, wherein a low-temperature hot water pump 4 is provided on the first hot water pipe network 3, and the low-temperature hot water pump 4 is used to transport the low-temperature hot water in the low-temperature hot water tank 1 to the high-temperature hot water tank 2;

[0028] The first heat exchanger 5 is provided at the first hot water pipe network 3 and is used to heat the low-temperature hot water of 65-75 degrees to 90-95 degrees and enter the high-temperature hot water tank 2;

[0029] A second hot water pipe network 6, wherein the second hot water pipe network 6 is provided with a high-temperature hot water pump 7, and the high-temperature hot water pump 7 is used to transport the high-temperature hot water in the high-temperature hot water tank 2 to the low-temperature hot water tank 1;

[0030] The second heat exchanger 8 is located at the second hot water pipe network 6 and is used to utilize the high-temperature hot water delivered by the high-temperature hot water tank 2. The beneficial effect of this utility model is that after the low-temperature hot water is pressurized by the low-temperature hot water pump, it enters the first hot water pipe network. After sufficient heat exchange with the first heat exchanger, the hot water temperature is raised to 90-95°C before entering the high-temperature hot water tank. This prevents the release of components such as light hydrocarbons, ensuring stable pipe network pressure. The high-temperature hot water pump then delivers the heat to the second hot water pipe network for full utilization, rationally utilizing the low-temperature hot water, improving energy efficiency, and reducing system energy consumption. This utility model also has the advantages of a simple structure, easy assembly, long service life, and reduced system energy consumption.

[0031] The present invention further includes a third hot water pipe network 9, which is disposed between the high-temperature hot water tank 2 and the low-temperature hot water tank 1 and is arranged in parallel with the second heat exchanger 8. Specifically, the present invention further includes a waste heat steam generation facility 10, which is disposed on the third hot water pipe network 9 and is used to vaporize the high-temperature hot water into steam for output.

[0032] The waste heat steam generation facility 10 is connected to the first low-pressure steam network 11 and outputs 120-150 degree steam. Specifically, the waste heat steam generation facility 10 is connected to the vacuum pump 12 and outputs 180-200 degree steam to the second low-pressure steam network 13. The low-pressure steam generated by the waste heat steam generation facility can be connected to the low-pressure steam network, or it can be converted into low-pressure steam with the help of a vacuum pump and incorporated into the network; it can be reasonably adjusted according to the needs of the two networks. In fact, the first low-pressure steam network and the second low-pressure steam network have different requirements for steam temperature. Generally speaking, the steam pressure entering the first steam network is about 0.3-0.5MPa, and at the second low-pressure steam network, the vacuum pump will also be connected to 3.5MPa of high-temperature steam. The output of the waste heat steam generation facility can be reasonably adjusted according to the needs of the two networks.

[0033] The present invention also includes an on-off valve 14, located on the third hot water pipe network 9. This valve controls the flow of hot water from the hot water tank 2 into the waste heat steam generation facility 10, prioritizing the flow of hot water to the second heat exchanger 8. Closing the on-off valve allows the hot water in the hot water tank to flow to the second heat exchanger. Excess hot water is then used to generate steam for the plant's steam network.

[0034] The present invention also includes a detector 15 for detecting the temperature of water entering the low-temperature hot water tank 1. Specifically, the present invention also includes a circulating water cooler 16, which cooperates with the detector 15 to automatically adjust the circulating water flow rate based on temperature changes at the detector 15 to ensure a stable external water temperature. Based on the online temperature control point TI (detector), when the temperature exceeds 70°C, the waste heat steam generator increases its load to produce more low-pressure steam. Simultaneously, the circulating water cooler automatically adjusts the circulating water flow rate based on the temperature changes at the control point, thus achieving the goal of generating more steam and reducing circulating water consumption while ensuring a stable external water temperature.

[0035] The present invention also includes a flare system, which is respectively connected to the tank tops of the low-temperature hot water tank 1 and the high-temperature hot water tank 2, and is used to remove the gaseous components in the low-temperature hot water tank 1 and the high-temperature hot water tank 2, and to prevent the low-temperature hot water pump 4 and the high-temperature hot water pump 7 from being evacuated. Specifically, the present invention also includes a pressure-compensating device, which is respectively connected to the low-temperature hot water tank 1 and the high-temperature hot water tank 2, and is used to ensure the stability of the inlet pressure of the low-temperature hot water pump 4 and the high-temperature hot water pump 7 by compensating the pressure with nitrogen. The system is provided with a low-temperature hot water tank and a high-temperature hot water tank, and the tank top is provided with a connection to the flare system and the pressure-compensating device. When a gaseous component in the system leaks into the hot water system, it can be released from the hot water tank to the flare system, reducing the interference of the flare on the hot water system and preventing the pump from being evacuated due to gas. Secondly, nitrogen sealing can ensure the stability of the pressure in the tank, ensure the stability of the pump inlet pressure, and maintain the stability of the pressure of the entire plant pipeline network.

[0036] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0038] Technical personnel please note: Although the utility model has been described according to the above specific implementation methods, the utility model concept is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of the utility model patent right.

Claims

1. A low-temperature hot water comprehensive utilization device, characterized in that :include: A low-temperature hot water tank (1) is used to store and output low-temperature hot water at 65-75 degrees; A high-temperature hot water tank (2) is used to store and output high-temperature hot water at 90-95 degrees; a first hot water pipe network (3), wherein a low-temperature hot water pump (4) is provided on the first hot water pipe network (3), and the low-temperature hot water pump (4) is used to transport the low-temperature hot water in the low-temperature hot water tank (1) to the high-temperature hot water tank (2); A first heat exchanger (5) is provided at the first hot water pipe network (3) and is used to heat the low-temperature hot water of 65-75 degrees to 90-95 degrees and then enter the high-temperature hot water tank (2); a second hot water pipe network (6), wherein a high-temperature hot water pump (7) is provided on the second hot water pipe network (6), and the high-temperature hot water pump (7) is used to transport the high-temperature hot water in the high-temperature hot water tank (2) to the low-temperature hot water tank (1); The second heat exchanger (8) is provided at the second hot water pipe network (6) and is used to use the high-temperature hot water delivered by the high-temperature hot water tank (2).

2. A low-temperature hot water comprehensive utilization device according to claim 1, characterized in that It also includes a third hot water pipe network (9), which is arranged between the high-temperature hot water tank (2) and the low-temperature hot water tank (1), and is arranged in parallel with the second heat exchanger (8).

3. A low-temperature hot water comprehensive utilization device according to claim 2, characterized in that It also includes a waste heat steam generating facility (10) which is arranged on the third hot water pipe network (9) and is used to vaporize high-temperature hot water into steam for output.

4. A low-temperature hot water comprehensive utilization device according to claim 3, characterized in that The waste heat steam generating facility (10) is connected to the first low-pressure steam network (11) and outputs steam at 120-150 degrees.

5. A low-temperature hot water comprehensive utilization device according to claim 3, characterized in that The waste heat steam generating facility (10) is connected to the vacuum pump (12) and outputs 180-200 degree steam to the second low-pressure steam network (13).

6. A low-temperature hot water comprehensive utilization device according to claim 3, characterized in that It also includes an on-off valve (14) provided on the third hot water pipe network (9) for controlling the high-temperature hot water in the high-temperature hot water tank (2) to enter the waste heat steam generation facility (10) and give priority to meeting the needs of the second heat exchanger (8).

7. The low-temperature hot water comprehensive utilization device according to claim 1, characterized in that It also includes a detector (15) for detecting the temperature of water entering the low-temperature hot water tank (1).

8. A low-temperature hot water comprehensive utilization device according to claim 7, characterized in that It also includes a circulating water cooler (16) that cooperates with the detector (15) to automatically adjust the flow rate of the circulating water according to the temperature change of the detector (15) to ensure the stability of the external water supply temperature.

9. The low-temperature hot water comprehensive utilization device according to claim 7, characterized in that It also includes a flare system, which is connected to the tank tops of the low-temperature hot water tank (1) and the high-temperature hot water tank (2) respectively, and is used to remove gaseous components in the low-temperature hot water tank (1) and the high-temperature hot water tank (2) and prevent the low-temperature hot water pump (4) and the high-temperature hot water pump (7) from being evacuated.

10. The low-temperature hot water comprehensive utilization device according to claim 7, characterized in that It also includes a pressure replenishing device, which is connected to the low-temperature hot water tank (1) and the high-temperature hot water tank (2) respectively, and is used to replenish pressure through nitrogen to ensure the stability of the inlet pressure of the low-temperature hot water pump (4) and the high-temperature hot water pump (7).

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