System for comprehensively utilizing waste heat of high-pressure liquid heating medium by utilizing upgrading unit and ORC (organic Rankine cycle)

Abstract

The utility model discloses a system for comprehensively utilizing waste heat of a high-pressure liquid heating medium by utilizing an upgrading unit and an ORC (organic Rankine cycle). The system comprises a flash evaporation device, a steam upgrading unit, an ORC generator set, an aftercooler and a condensate tank, circulating cooling water is connected with the steam upgrading unit, the ORC generator set and the aftercooler through a circulating cooling water supply pipeline; high-pressure condensed water enters a flash evaporation device through a high-pressure condensed water pipeline, the top and the bottom of the flash evaporation device are connected with the steam upgrading unit and the ORC generator set respectively, the steam upgrading unit is connected with a high-pressure steam discharge pipeline, the ORC generator set is connected with an after-cooler, the after-cooler is connected with a condensate tank, and the condensate tank is connected with a condensate outlet. And the condensate tank is connected with an ORC unit hot water discharge pipeline. The waste heat recovery system has the advantages that through cooperation of the steam upgrading unit and the ORC generator set, efficient recovery of waste heat resources is achieved.

Description

Technical Field

[0001] This utility model relates to the field of low-temperature generator steam compression technology, and in particular to a system for the comprehensive utilization of waste heat from a high-pressure liquid heat transfer unit and an ORC. Background Technology

[0002] Industrial processes generate large amounts of high-pressure condensate (temperatures reaching 100-150℃), which contains considerable heat energy. However, due to limitations in traditional process design, this high-quality waste heat often cannot be effectively utilized and can only be cooled using equipment such as cooling towers. This not only results in significant energy waste but also increases the operating load on cooling systems, leading to reduced energy efficiency and increased operating costs for enterprises. This energy waste is particularly pronounced in energy-intensive industries such as chemicals and steel, directly impacting the economic benefits and energy efficiency indicators of these companies. Utility Model Content

[0003] The purpose of this invention is to provide a system for the comprehensive utilization of waste heat from a high-pressure liquid heat transfer unit and an ORC, thereby solving the aforementioned problems in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A system for comprehensive waste heat utilization of high-pressure liquid heat transfer medium using a steam upgrading unit and an ORC generator set includes a flash evaporator, a steam upgrading unit, an ORC generator set, an aftercooler, and a condensate tank. Circulating cooling water is connected to the steam upgrading unit, the ORC generator set, and the aftercooler via a circulating cooling water supply pipeline. High-pressure condensate enters the flash evaporator via a high-pressure condensate pipeline. The top and bottom of the flash evaporator are connected to the steam upgrading unit and the ORC generator set, respectively. A high-pressure steam discharge pipeline is connected to the steam upgrading unit. The ORC generator set is connected to the aftercooler, and the aftercooler is connected to the condensate tank. A hot water discharge pipeline from the ORC unit is connected to the condensate tank.

[0006] Preferably, the system further includes a steam standby cooler; the top of the flash evaporator is connected to the steam standby cooler; the steam standby cooler is connected to the steam upgrading unit; the high-pressure steam discharge pipeline is connected to the steam standby cooler; and a cooling water return pipeline is connected to the steam standby cooler.

[0007] Preferably, the system further includes a flash condensate backup cooler; the bottom of the flash evaporation device is connected to the flash condensate backup cooler; the flash condensate backup cooler is connected to the ORC generator set; the flash condensate backup cooler is connected to the connecting pipeline between the ORC generator set and the aftercooler; the flash condensate backup cooler is connected to the connecting pipeline between the steam upgrading unit and the steam backup cooler.

[0008] Preferably, the flash evaporation device includes a main flash tank and a backup flash tank, the tops of which are connected to the steam upgrading unit and the steam standby cooler; the bottoms of which are connected to the ORC generator set and the flash condensate standby cooler.

[0009] Preferably, a circulating water pump is installed on the circulating cooling water supply pipeline.

[0010] Preferably, the hot water discharge pipeline of the ORC unit is equipped with a condensate pump.

[0011] Preferably, both the main flash tank and the backup flash tank are provided with flash steam vents at their tops.

[0012] The beneficial effects of this invention are: 1. Low operation and maintenance costs: The ORC equipment has a high degree of integration and cohesion, mature steam compression technology, and low maintenance costs for the coupled system. 2. Emission reduction advantages: It fully utilizes waste heat or renewable energy, reducing fossil fuel consumption and carbon emissions, which aligns with the carbon neutrality goal. 3. The steam compression and ORC coupled system significantly improves energy efficiency and economy through temperature matching and energy cascade utilization, making it particularly suitable for scenarios with abundant medium and low temperature heat sources. It represents an important technological direction for future distributed energy and waste heat recovery. Attached Figure Description

[0013] Figure 1 This is a structural diagram of the system in an embodiment of this utility model.

[0014] In the diagram: 1- Circulating cooling water supply pipeline; 2- Flash steam reserved outlet; 3- Steam standby cooler; 4- Steam upgrading unit; 5- ORC generator set; 6- Circulating water pump; 7- Main flash tank; 8- Standby flash tank; 9- Flash condensate standby cooler; 10- Aftercooler; 11- Condensate tank; 12- Condensate pump; 13- High-pressure steam discharge pipeline; 14- High-pressure condensate input pipeline; 15- ORC unit hot water discharge pipeline; 16- Cooling water return pipeline. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0016] In this embodiment, a system for the comprehensive utilization of waste heat from a high-pressure liquid heat transfer unit and an ORC generator set is provided to address the common problem of energy waste in the industry. Through the coordinated operation of the steam heat transfer unit 4 and the ORC generator set 5, the efficient recovery of waste heat resources is achieved.

[0017] During system operation, the high-pressure condensate first enters the flash evaporator for depressurized flash evaporation. The resulting saturated steam enters the steam upgrading unit 4, where it is pressurized and heated to become high-quality superheated steam, which can be directly reused in the production process. Simultaneously, the low-pressure saturated water after flash evaporation enters the ORC generator unit 5 for secondary energy recovery. The hot water at the ORC unit outlet is then cooled to the required 45°C by an aftercooler before storage. Through this cascaded utilization method, the system can maximize the recovery of thermal and potential energy from the high-pressure condensate.

[0018] like Figure 1 As shown, the system specifically includes a flash evaporator, a steam upgrading unit 4, an ORC generator set 5, an aftercooler 10, and a condensate tank 11. Circulating cooling water is connected to the steam upgrading unit 4, the ORC generator set 5, and the aftercooler 10 via a circulating cooling water supply pipeline 1. High-pressure condensate enters the flash evaporator via a high-pressure condensate inlet pipeline 14. The top and bottom of the flash evaporator are connected to the steam upgrading unit 4 and the ORC generator set 5, respectively. A high-pressure steam discharge pipeline 13 is connected to the steam upgrading unit 4. The ORC generator set 5 is connected to the aftercooler 10, and the aftercooler 10 is connected to the condensate tank 11. A hot water discharge pipeline 15 for the ORC generator set is connected to the condensate tank 11. A circulating water pump 6 is installed on the circulating cooling water supply pipeline 1, and a condensate pump 12 is installed on the hot water discharge pipeline 15 for the ORC generator set. The number of various pumps can be set according to actual conditions, such as... Figure 1 As shown, two of each type of pump are provided.

[0019] The system also includes a steam standby cooler 3; the top of the flash evaporator is connected to the steam standby cooler 3; the steam standby cooler 3 is connected to the steam upgrading unit 4; the high-pressure steam discharge pipeline 13 is connected to the steam standby cooler 3; a cooling water return pipeline 16 is connected to the steam standby cooler 3. The system also includes a flash condensate standby cooler 9; the bottom of the flash evaporator is connected to the flash condensate standby cooler 9; the flash condensate standby cooler 9 is connected to the ORC generator set 5; the flash condensate standby cooler 9 is connected to the connecting pipeline between the ORC generator set 5 and the aftercooler 10; the flash condensate standby cooler 9 is connected to the connecting pipeline between the steam upgrading unit 4 and the steam standby cooler 3.

[0020] In this embodiment, the flash evaporation device includes a main flash tank 7 and a backup flash tank 8. The tops of both the main flash tank 7 and the backup flash tank 8 are connected to the steam upgrading unit 4 and the steam standby cooler 3; the bottoms of both the main flash tank 7 and the backup flash tank 8 are connected to the ORC generator set 5 and the flash condensate standby cooler 9. The tops of both the main flash tank 7 and the backup flash tank 8 are provided with flash steam reserved outlets 2.

[0021] The system operates as follows: During normal operation, high-pressure condensate enters the main flash tank 7 and the backup flash tank 8 via the high-pressure condensate inlet pipeline 14 for depressurized flash evaporation. The high-pressure saturated steam generated during flash evaporation is discharged from the top of the tanks and enters the steam upgrading unit 4 via pipelines to compress the steam. The compressed high-pressure superheated steam is then discharged to the location designated by the owner. Simultaneously, the low-pressure saturated water at the bottom of the flash tanks enters the ORC generator set 5 via pipelines. After heat recovery, it is cooled to the required process temperature by the aftercooler 10 and finally flows into the condensate tank 11 via pipelines, and then is discharged to the location designated by the owner by the condensate pump 12.

[0022] The high-pressure saturated steam discharged from the top of the main flash tank 7 and the standby flash tank 8 enters the steam upgrading unit 4 and also enters the steam standby cooler 3. The low-pressure hot water discharged from the bottom of the main flash tank 7 and the standby flash tank 8 enters the ORC generator unit 5 and also enters the flash condensate standby cooler 9, thus ensuring the safe operation of the unit.

[0023] The circulating cooling water enters the circulating water pump 6 through the circulating cooling water supply pipeline 1 to supply circulating water to the steam upgrading unit 4, ORC generator set 5, No. 3 standby steam cooler, flash condensate standby cooler 9, and aftercooler 10. Finally, it is discharged to the location designated by the owner through the cooling water return pipeline 16.

[0024] In this embodiment, multiple safeguard mechanisms are set up to ensure the safe and stable operation of the process:

[0025] 1) When the steam upgrading unit 4 or ORC generator unit 5 is under maintenance, it can be switched to standby cooler operation;

[0026] 2) The system is equipped with an emergency cooling circuit, which can still ensure the cooling requirements of condensate when all equipment is shut down;

[0027] 3) An intelligent temperature control system is adopted, which precisely controls the output condensate temperature within the range of 45±2℃ through regulating valves. Regulating valves are installed on the corresponding connecting pipelines. When the heat medium parameters fluctuate, causing the ORC outlet temperature to be too high, the regulating valves open to divert part of the heat medium to the flash condensate standby cooler 9 for secondary cooling, ensuring that the output condensate temperature is stable at 45±2℃. When the heat medium temperature is too low, the regulating valves open to allow part of the heat medium to bypass directly to the condensate tank 11, maintaining the system's thermal balance.

[0028] When ORC generator set 5 is under maintenance, the heat transfer medium is treated by flash condensate standby cooler 9; when steam upgrading unit 4 is under maintenance, all heat transfer medium is treated by steam standby cooler 3. When steam upgrading unit 4 and ORC generator set 5 are shut down at the same time, the system automatically switches to standby cooler operation. After being rapidly cooled by the standby cooler, the heat transfer medium is directly delivered to the location designated by the owner via condensate pump 12.

[0029] The system not only solves the technical challenges of high-pressure condensate waste heat recovery, but also ensures operational reliability through modular design. Practical applications show that the system can recover more than 85% of the heat energy from high-pressure condensate, with an investment payback period of 2-3 years, significantly improving the energy efficiency and economic benefits of enterprises.

[0030] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0031] This invention provides a system for generating electricity from waste heat using a high-pressure liquid heat transfer medium via a heat exchanger and an ORC (Organic Refrigerant Charge). It features low operation and maintenance costs: the ORC equipment has a high degree of integration and cohesion, the steam compression technology is mature, and the coupled system has low maintenance costs. Emission reduction advantages: it fully utilizes waste heat or renewable energy, reducing fossil fuel consumption and carbon emissions, aligning with carbon neutrality goals. The steam compression and ORC coupled system significantly improves energy efficiency and economy through temperature matching and energy cascade utilization, making it particularly suitable for scenarios with abundant medium- and low-temperature heat sources. It represents an important technological direction for future distributed energy and waste heat recovery.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A system for comprehensive utilization of waste heat from a high-pressure liquid heat transfer medium using a heat exchanger and an ORC, characterized in that: The system includes a flash evaporator, a steam upgrading unit, an ORC generator set, an aftercooler, and a condensate tank. Circulating cooling water is connected to the steam upgrading unit, ORC generator set, and aftercooler via a circulating cooling water supply pipeline. High-pressure condensate enters the flash evaporator via a high-pressure condensate pipeline. The top and bottom of the flash evaporator are connected to the steam upgrading unit and the ORC generator set, respectively. A high-pressure steam discharge pipeline is connected to the steam upgrading unit. The ORC generator set is connected to the aftercooler, and the aftercooler is connected to the condensate tank. A hot water discharge pipeline from the ORC unit is connected to the condensate tank.

2. The system for comprehensive waste heat utilization using a high-pressure liquid heat transfer unit and ORC as described in claim 1, characterized in that: The system also includes a steam standby cooler; the top of the flash evaporator is connected to the steam standby cooler; the steam standby cooler is connected to the steam upgrading unit; the high-pressure steam discharge pipeline is connected to the steam standby cooler; and a cooling water return pipeline is connected to the steam standby cooler.

3. The system for comprehensive waste heat utilization using a high-pressure liquid heat transfer unit and ORC according to claim 2, characterized in that: The system also includes a flash condensate standby cooler; the bottom of the flash evaporation device is connected to the flash condensate standby cooler; the flash condensate standby cooler is connected to the ORC generator set; the flash condensate standby cooler is connected to the connecting pipeline between the ORC generator set and the aftercooler; the flash condensate standby cooler is connected to the connecting pipeline between the steam upgrading unit and the steam standby cooler.

4. The system for comprehensive waste heat utilization using a high-pressure liquid heat transfer unit and ORC according to claim 3, characterized in that: The flash evaporation device includes a main flash tank and a backup flash tank. The tops of both the main flash tank and the backup flash tank are connected to the steam upgrading unit and the steam standby cooler. The bottoms of both the main flash tank and the backup flash tank are connected to the ORC generator set and the flash condensate standby cooler.

5. The system for comprehensive utilization of waste heat from high-pressure liquid heat transfer medium using a quality-upgrading unit and ORC as described in claim 1, characterized in that: A circulating water pump is installed on the circulating cooling water supply pipeline.

6. The system for comprehensive waste heat utilization using a high-pressure liquid heat transfer unit and ORC according to claim 1, characterized in that: The ORC unit's hot water discharge pipeline is equipped with a condensate pump.

7. The system for comprehensive utilization of waste heat from high-pressure liquid heat transfer medium using a quality-improving unit and ORC as described in claim 4, characterized in that: Both the main flash tank and the backup flash tank are equipped with flash steam vents at their tops.

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