Condensate heat recovery system

Abstract

The utility model relates to a chemical industry production heat recovery technology, and discloses a condensation water heat recovery system which comprises a steam condensation water collecting device, a heat exchanger, a raw material pump, an aromatic hydrocarbon device, a temperature sensor, a flow regulating valve and a control system. The steam condensation water collecting device is connected with the high-temperature fluid inlet through a high-temperature fluid inlet pipeline, the high-temperature fluid outlet is connected to the water return pipeline through a high-temperature fluid outlet pipeline, and the low-temperature fluid outlet is connected with the feeding pipeline through a low-temperature fluid outlet pipeline. The raw material pump is mounted on the feeding pipeline, the feeding pipeline is connected with a raw material storage tank, and the raw material pump is connected to the low-temperature fluid inlet through a low-temperature fluid inlet pipeline; the temperature sensors are respectively arranged at the low-temperature fluid inlet and the low-temperature fluid outlet; the flow regulating valve is installed on the high-temperature fluid inlet pipeline, and the high-temperature fluid inlet pipeline is further provided with a safety valve and a pressure sensor. And the control system is electrically connected with the temperature sensor, the flow regulating valve, the pressure sensor and the raw material pump.

Description

Technical Field

[0001] This utility model relates to the field of heat recovery technology in chemical production, and more specifically, to a condensate heat recovery system. Background Technology

[0002] In the chemical industry, especially in aromatics plants, the feed temperature is usually below the bubble point, entering the column as a subcooled liquid. This necessitates a significant additional amount of heat being supplied to the column bottom to raise the material to its bubble point, resulting in a substantial increase in steam consumption. For example, in one aromatics plant with a feed temperature below 40°C, the steam consumption of the extractive distillation column reached as high as 10 t / h, which not only increased production costs but also reduced energy efficiency, hindering the company's energy conservation, emission reduction, and sustainable development. Utility Model Content

[0003] This application provides a condensate heat recovery system, which solves the problem that in aromatics plants, the original feed temperature is usually lower than the bubble point and enters the tower in the form of a subcooled liquid. This causes the tower bottom to need to provide a large amount of extra heat to heat the material to the bubble point, which significantly increases steam consumption, increases production costs, and reduces energy efficiency.

[0004] This application provides a condensate heat recovery system, including a steam condensate collection device, a heat exchanger, a feed pump, an aromatics unit, a temperature sensor, a flow regulating valve, and a control system;

[0005] The outlet of the steam condensate collection device is connected to the high-temperature fluid inlet of the heat exchanger through a high-temperature fluid inlet pipe, the high-temperature fluid outlet of the heat exchanger is connected to the return water pipe through a high-temperature fluid outlet pipe, and the low-temperature fluid outlet of the heat exchanger is connected to the feed pipe of the aromatics unit through a low-temperature fluid outlet pipe.

[0006] The raw material pump is installed on the feed pipe, one end of the feed pipe is connected to the raw material storage tank, and the outlet of the raw material pump is connected to the cryogenic fluid inlet through the cryogenic fluid inlet pipe;

[0007] The temperature sensors are respectively installed at the cryogenic fluid inlet and the cryogenic fluid outlet of the heat exchanger;

[0008] The flow regulating valve is installed on the high-temperature fluid inlet pipe at the outlet of the steam condensate collection device. The high-temperature fluid inlet pipe is also equipped with a safety valve and a pressure sensor.

[0009] The control system is electrically connected to the temperature sensor, the flow regulating valve, the pressure sensor, and the raw material pump.

[0010] Preferably, the heat exchanger adopts a partitioned heat exchange structure.

[0011] Preferably, the metal tube bundle of the heat exchanger is made of stainless steel, which has good thermal conductivity and corrosion resistance.

[0012] Preferably, the steam condensate collection device includes a collection tank and a filter, the filter being disposed at the inlet of the collection tank.

[0013] Preferably, the control system includes a controller and an operating interface, wherein the controller is electrically connected to the operating interface.

[0014] Preferably, the safety valve is connected to a pressure relief pipe.

[0015] As can be seen from the above technical solution, this application provides a condensate heat recovery system in which the steam condensate collection device transports the steam condensate generated during the operation of the aromatics unit to the tube side of the heat exchanger. At the same time, the raw material in the raw material storage tank enters the shell side of the heat exchanger via the raw material pump. Inside the heat exchanger, steam condensate and raw materials are separated by the metal tube bundles. Heat is conducted from the steam condensate side to the raw material side through the tube walls, gradually increasing the raw material temperature. Temperature sensors monitor the inlet and outlet temperatures of the raw material in real time and feed the data back to the control system. When the raw material outlet temperature does not reach the set value of 60°C, the control system automatically adjusts the opening of the flow regulating valve to increase the flow rate of steam condensate and improve heat exchange efficiency. At the same time, the operating frequency of the raw material pump is adjusted according to actual needs to ensure that the raw material has sufficient residence time in the heat exchanger for sufficient heat exchange. After heat exchange, the raw material with a temperature of about 60°C is transported to the aromatics unit through the low-temperature fluid outlet pipeline and enters the subsequent production process. The steam condensate after heat exchange is discharged from the high-temperature fluid outlet pipeline of the heat exchanger and returned to the boiler and other equipment for reuse through the return water pipeline.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. After heat recovery, the feed temperature of the aromatics unit can be increased from <40℃ to 60℃, and the steam consumption of the extractive distillation column can be reduced from 10t / h to 8.5t / h. This effectively reduces steam consumption, lowers production costs, and improves energy efficiency, resulting in significant economic and environmental benefits. At the same time, it optimizes the operating conditions of the aromatics unit and improves the overall performance of the unit.

[0018] 2. This utility model effectively increases the feed temperature of the aromatics unit and significantly reduces steam consumption, achieving the expected energy-saving and consumption-reducing effects.

[0019] In summary, after heat recovery, the feed temperature of the aromatics unit can be increased from <40℃ to 60℃ by a condensate heat recovery system, and the steam consumption of the extractive distillation column can be reduced from 10t / h to 8.5t / h. This effectively reduces steam consumption, lowers production costs, and improves energy efficiency, resulting in significant economic and environmental benefits. At the same time, it optimizes the operating conditions of the aromatics unit and improves the overall performance of the unit. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 A schematic diagram of a condensate heat recovery system provided by this utility model;

[0022] Figure 2 This is a schematic diagram of the control system in a condensate heat recovery system provided by this utility model.

[0023] The reference numerals in the detailed embodiments are as follows:

[0024] 1. Steam condensate collection device; 101. Collection tank; 102. Filter; 2. Heat exchanger; 3. Raw material pump; 4. Aromatics unit; 5. Raw material storage tank; 6. Feed pipe; 7. Temperature sensor; 8. Flow regulating valve; 9. Control system; 901. Controller; 902. Operating interface; 10. High-temperature fluid inlet; 11. Low-temperature fluid inlet; 12. High-temperature fluid outlet; 13. Low-temperature fluid outlet; 14. High-temperature fluid inlet pipe; 15. High-temperature fluid outlet pipe; 16. Low-temperature fluid inlet pipe; 17. Low-temperature fluid outlet pipe; 18. Return water pipe; 19. Safety valve; 20. Pressure relief pipe; 21. Pressure sensor. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0026] See Figure 1-2This application discloses a condensate heat recovery system. To address the problem in aromatics plants where the feed temperature is typically below the bubble point, entering the column as a subcooled liquid, necessitates a significant increase in steam consumption due to the need for additional heat in the column bottom to raise the feed to the bubble point. This not only increases production costs but also reduces energy efficiency. The proposed system recovers heat from condensate, raising the feed temperature from <40℃ to 60℃ and reducing steam consumption in the extractive distillation column from 10t / h to 8.5t / h. This effectively reduces steam consumption, lowers production costs, and improves energy efficiency, resulting in significant economic and environmental benefits. Furthermore, it optimizes the operating conditions of the aromatics plant and enhances its overall performance.

[0027] Specifically, a condensate heat recovery system includes a steam condensate collection device 1, a heat exchanger 2, a feed pump 3, an aromatics unit 4, a temperature sensor 7, a flow regulating valve 8, and a control system 9. The steam condensate collection device 1 includes a collection tank 101 and a filter 102. The filter 102 is located at the inlet of the collection tank 101 and is used to filter impurities in the steam condensate. The collection tank 101 is used to collect the steam condensate generated in the aromatics unit 4, and its outlet is connected to the high-temperature fluid inlet 10 of the heat exchanger 2. The heat exchanger 2 adopts a partitioned heat exchange structure with several metal tube bundles inside, separating the high-temperature fluid steam condensate from the low-temperature fluid aromatics unit feedstock. The steam condensate flows in the tube side, while the aromatics unit 4 feedstock flows in the shell side. Heat is conducted from the high-temperature side to the low-temperature side through the metal tube walls, achieving preheating of the feedstock. The metal tube bundles of the heat exchanger 2 are made of stainless steel with good thermal conductivity and corrosion resistance, which can ensure effective heat transfer. For long-term stable operation, the outlet of the steam condensate collection device 1 is connected to the high-temperature fluid inlet 10 of the heat exchanger 2 through the high-temperature fluid inlet pipe 14. The high-temperature fluid outlet 12 of the heat exchanger 2 is connected to the return water pipe 18 through the high-temperature fluid outlet pipe 15. The high-temperature fluid outlet 12 of the heat exchanger 2 is connected to the return water pipe 18 to return the condensate after heat exchange to the boiler and other equipment for reuse. The low-temperature fluid outlet 13 of the heat exchanger 2 is connected to the feed pipe 6 of the aromatics unit 4 through the low-temperature fluid outlet pipe 17. The low-temperature fluid outlet 13 is connected to the raw material feed pipe 6 of the aromatics unit 4 to transport the preheated raw material to the aromatics unit 4. The raw material pump 3 is installed on the feed pipe 6. One end of the feed pipe 6 is connected to the raw material storage tank 5. The outlet of the raw material pump 3 is connected to the low-temperature fluid inlet 11 through the low-temperature fluid inlet pipe 16. The raw material pump 3 provides power for the flow of raw material in the heat exchanger 2 to ensure that the raw material and steam condensate have sufficient contact and heat exchange in the heat exchanger 2.

[0028] Temperature sensors 7 are respectively installed at the low-temperature fluid inlet 11 and low-temperature fluid outlet 13 of heat exchanger 2. Temperature sensors 7 are used to monitor the inlet and outlet temperatures of the raw materials in real time and transmit the temperature signals to the control system 9. A flow regulating valve 8 is installed on the high-temperature fluid inlet pipe 14 at the outlet of the steam condensate collection device 1. The flow regulating valve 8 can automatically adjust its opening according to the conditions inside the heat exchanger 2, controlling the flow rate of steam condensate into the heat exchanger 2 to ensure the stable operation of the heat exchange process. A safety valve 19 and a pressure sensor 21 are also installed on the high-temperature fluid inlet pipe 14. When the pressure inside the high-temperature fluid inlet pipe 14 exceeds the set value, the safety valve 19 automatically opens to release excess pressure, ensuring the safe operation of the system. A safety valve 19 is connected to... The pressure relief pipeline 20; the control system 9 includes a controller 901 and an operating interface 902. The controller 901 and the operating interface 902 are electrically connected. The controller 901 receives signals from the temperature sensor 7, etc., and controls the flow regulating valve 8 and the raw material pump 3 according to the preset control logic. The operating interface 902 is used to display system operating parameters and set control parameters. The control system 9 is electrically connected to the temperature sensor 7, the flow regulating valve 8, the pressure sensor 21, and the raw material pump 3. The control system 9 receives signals transmitted from the temperature sensor 7, the pressure sensor 21, etc., and automatically controls the flow regulating valve 8, the raw material pump 3, etc., according to the preset control logic, to achieve precise regulation of the heat exchange process and ensure that the raw material temperature is stably increased to the set value. This application achieves an effective increase in the feed temperature of the aromatics unit 4 and a significant reduction in steam consumption, achieving the expected energy saving and consumption reduction effect.

[0029] As can be seen from the above technical solution, in the operation of a condensate heat recovery system, the steam condensate collection device 1 transports the steam condensate generated during the operation of the aromatics unit 4 to the tube side of the heat exchanger 2 through the high-temperature fluid inlet pipe 14. At the same time, the raw material in the raw material storage tank 5 enters the shell side of the heat exchanger 2 via the raw material pump 3. Inside heat exchanger 2, steam condensate and raw materials are separated by a metal tube bundle. Heat is conducted from the steam condensate side to the raw material side through the tube wall, causing the raw material temperature to gradually rise. Temperature sensor 7 monitors the inlet and outlet temperatures of the raw material in real time and feeds the data back to control system 9. When the raw material outlet temperature does not reach the set value of 60°C, control system 9 automatically adjusts the opening of flow regulating valve 8 to increase the flow rate of steam condensate and improve heat exchange efficiency. At the same time, it adjusts the operating frequency of raw material pump 3 according to actual needs to ensure that the raw material has sufficient residence time in heat exchanger 2 for full heat exchange. After heat exchange, the raw material with a temperature of about 60°C is transported to aromatics unit 4 through low-temperature fluid outlet pipe 17 and enters the subsequent production process. The steam condensate after heat exchange is discharged from high-temperature fluid outlet pipe 15 of heat exchanger 2 and returned to boilers and other equipment for reuse through return water pipe 18.

[0030] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the applications disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and incorporate common knowledge or customary techniques in the art disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0031] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A condensate heat recovery system, characterized in that: It includes a steam condensate collection device (1), a heat exchanger (2), a feed pump (3), an aromatics unit (4), a temperature sensor (7), a flow control valve (8), and a control system (9). The outlet of the steam condensate collection device (1) is connected to the high temperature fluid inlet (10) of the heat exchanger (2) through the high temperature fluid inlet pipe (14), the high temperature fluid outlet (12) of the heat exchanger (2) is connected to the return water pipe (18) through the high temperature fluid outlet pipe (15), and the low temperature fluid outlet (13) of the heat exchanger (2) is connected to the feed pipe (6) of the aromatics device (4) through the low temperature fluid outlet pipe (17). The raw material pump (3) is installed on the feed pipe (6), one end of the feed pipe (6) is connected to the raw material storage tank (5), and the outlet of the raw material pump (3) is connected to the cryogenic fluid inlet (11) through the cryogenic fluid inlet pipe (16). The temperature sensors (7) are respectively installed at the low-temperature fluid inlet (11) and the low-temperature fluid outlet (13) of the heat exchanger (2); The flow regulating valve (8) is installed on the high-temperature fluid inlet pipe (14) at the outlet of the steam condensate collection device (1). The high-temperature fluid inlet pipe (14) is also equipped with a safety valve (19) and a pressure sensor (21). The control system (9) is electrically connected to the temperature sensor (7), the flow regulating valve (8), the pressure sensor (21), and the raw material pump (3).

2. A condensate heat recovery system according to claim 1, wherein: The heat exchanger (2) adopts a partition wall heat exchange structure.

3. A condensate heat recovery system according to claim 2, wherein: The metal tube bundle of the heat exchanger (2) is made of stainless steel with good thermal conductivity and corrosion resistance.

4. The condensate heat recovery system of claim 1, wherein: The steam condensate collection device (1) includes a collection tank (101) and a filter (102), wherein the filter (102) is disposed at the inlet of the collection tank (101).

5. The condensate heat recovery system of claim 1, wherein: The control system (9) includes a controller (901) and an operation interface (902), wherein the controller (901) is electrically connected to the operation interface (902).

6. A condensate heat recovery system as claimed in claim 1, wherein: The safety valve (19) is connected to a pressure relief pipe (20).

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