Mvr system heat source energy saving system

Abstract

The utility model discloses a kind of MVR system heat source energy-saving system, it is related to steam mechanical re-compression equipment technical field, main purpose is to provide a kind of MVR system heat source energy-saving system which can reduce steam usage amount, and reduce the use load of circulating water.A kind of MVR system heat source energy-saving system of the utility model main technical scheme is as follows: a kind of MVR system heat source energy-saving system, comprising: original liquid component, one end of first liquid supply pipeline is connected to original liquid tank;Heat exchange component, the other end of first liquid supply pipeline is connected to the one end of pipe passage of circulating water heat exchanger, the other end of pipe passage of circulating water heat exchanger is connected to the pipe passage of first preheater;Processing component, circulating component is connected to third preheater and distilled water component respectively, one end of distilled water component is connected to the one end of shell passage of first preheater, the other end of shell passage of first preheater is connected to the one end of shell passage of circulating water heat exchanger.The utility model is mainly used for metering flow.

Description

Technical Field

[0001] This utility model relates to the field of steam mechanical recompression equipment technology, and in particular to an energy-saving heat source system for an MVR system. Background Technology

[0002] MVR (Mechanical Vapor Recompression) technology utilizes secondary steam generated within the steam system itself. This secondary steam is compressed to a higher pressure by a steam compressor, increasing its internal energy and enabling continuous energy recycling. This requires only a small amount of electricity to reuse the internal energy of low-pressure steam. The process involves compressing low-temperature steam through a compressor, increasing its temperature, pressure, and enthalpy. The steam then enters a heat exchanger for condensation, fully utilizing its latent heat. Except during startup, only a small amount of live steam is used throughout the evaporation process. The secondary steam exiting the evaporator is compressed, increasing its pressure, temperature, and enthalpy, and then sent to the evaporator's heating chamber as heating steam to maintain the liquid's boiling state. The heating steam itself condenses into water. In this way, steam that would otherwise be wasted is fully utilized, latent heat is recovered, and thermal efficiency is improved.

[0003] In existing technology, high-salinity brine, after desiliconization and hardening, enters the MVR system. The raw liquid temperature is 20-25°C. It is heated through a three-stage heat exchanger and finally preheated to 95°C with low-pressure live steam, forming a superheated liquid. This liquid then enters a crystallizer for superheated flash evaporation, leading to concentration and crystallization. The 90°C secondary steam exiting the top of the crystallizer enters a steam compressor. Through energy conversion, the enthalpy of the secondary steam increases, and its temperature rises to approximately 110°C. The compressed steam then enters a forced circulation heat exchanger to heat the material. During this heating process, some of the steam condenses into water, which flows to a condensate tank and is cooled by a circulating water plate heat exchanger. The cooled condensate is then discharged into the circulating water system for reuse.

[0004] However, after the MVR system has been running for a period of time, the tubes of the three-stage heat exchanger may become clogged, resulting in a decrease in heat exchange capacity. In order to ensure the liquid inlet temperature of the evaporation chamber, the amount of live steam used will increase, which increases the energy consumption of the unit. At the same time, the distilled water after heat exchange needs to use a portion of the circulating water as a refrigerant to cool it down before being returned to the circulating water system, which increases the load on the circulating water. Utility Model Content

[0005] In view of this, the present invention provides an energy-saving system for the heat source of an MVR system, the main purpose of which is to provide an energy-saving system for the heat source of an MVR system that can reduce steam consumption and reduce the load on circulating water.

[0006] To achieve the above objectives, this utility model mainly provides the following technical solutions:

[0007] This utility model embodiment provides a heat source energy-saving system for an MVR system, the device comprising:

[0008] The raw liquid component includes a raw liquid tank and a first supply pipe, one end of which is connected to the raw liquid tank.

[0009] The heat exchange component includes a circulating water heat exchanger, a first preheater, a second preheater, and a third preheater. The tubes of the first preheater, the second preheater, and the third preheater are connected sequentially. The other end of the first liquid supply pipe is connected to one end of the tube of the circulating water heat exchanger, and the other end of the tube of the circulating water heat exchanger is connected to the tube of the first preheater.

[0010] The processing component includes a circulation component and a distilled water component. The circulation component is connected to the third preheater and the distilled water component, respectively. One end of the distilled water component is connected to one end of the shell side of the first preheater, and the other end of the shell side of the first preheater is connected to one end of the shell side of the circulating water heat exchanger.

[0011] Furthermore, the heat exchange component also includes a condensate component, one end of which is connected to the circulating water recovery system, and the other end is connected to the other end of the shell side of the circulating water heat exchanger.

[0012] Furthermore, the circulation component includes a forced circulation heat exchanger and a circulation pump, with one end of the tube side of the forced circulation heat exchanger connected to the tube side of the third preheater and the other end connected to the circulation pump.

[0013] Furthermore, the circulation component also includes a crystallizer and a steam compressor. One end of the crystallizer is connected to the circulation pump, and the other end is connected to the steam compressor. The steam compressor is connected to one end of the shell side of the forced circulation heat exchanger, and the other end of the shell side of the forced circulation heat exchanger is connected to the distilled water component.

[0014] Furthermore, the heat exchange component also includes a non-condensable gas pipeline, one end of which is connected to the forced circulation heat exchanger and the other end of which is connected to the shell side of the second preheater.

[0015] Furthermore, the heat exchange component also includes a steam component, which is connected to the shell side of the third heat exchanger.

[0016] Furthermore, a non-condensable gas heat exchanger is provided, which is connected to the shell side of the second preheater.

[0017] In the technical solution provided by this utility model embodiment, the function of the raw liquid component is to transport the raw liquid. The raw liquid component includes a raw liquid tank and a first supply pipe, one end of which is connected to the raw liquid tank. The function of the heat exchange component is to raise the temperature of the raw liquid. The heat exchange component includes a circulating water heat exchanger, a first preheater, a second preheater, and a third preheater. The tubes of the first preheater, the second preheater, and the third preheater are connected sequentially. The other end of the first supply pipe is connected to one end of the tube of the circulating water heat exchanger, and the other end of the tube of the circulating water heat exchanger is connected to the tube of the first preheater. The function of the processing component is to process the raw liquid. The processing component includes a circulation component and a distilled water component. The circulation component is connected to the third preheater and the distilled water component respectively. One end of the distilled water component is connected to one end of the shell side of the first preheater, and the other end of the shell side of the first preheater is connected to one end of the shell side of the circulating water heat exchanger. Compared with the prior art, after a period of operation of the MVR system, blockage may occur in the tubes of the three-stage heat exchanger. Furthermore, the heat exchange rate decreases, requiring increased live steam consumption to maintain the inlet temperature of the evaporation chamber, thus increasing the energy consumption of the device. Simultaneously, the distilled water after heat exchange needs to be cooled using a portion of the circulating water as a refrigerant before being returned to the circulating water system, increasing the load on the circulating water. In this technical solution, the raw liquid tank and the first supply pipe are connected to one end of the tube side of the circulating water heat exchanger, and the other end of the tube side is connected to the first preheater. This allows the MVR raw liquid temperature to rise from 25 degrees Celsius to 42 degrees Celsius after entering the circulating water heat exchanger. It then undergoes heat exchange through the first, second, and third preheaters, bringing the raw liquid temperature to the brine temperature required for entering the treatment components. Simultaneously, steam no longer needs to enter the third preheater for heating, reducing steam consumption. Moreover, because the distilled water discharged from the first preheater undergoes heat exchange within the circulating water heat exchanger, the temperature of the water discharged from the circulating water heat exchanger is reduced to 40 degrees Celsius before entering the cooling water components, significantly reducing the system's energy consumption and the load on the circulating water system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an MVR system heat source energy-saving system provided in an embodiment of the present utility model. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, this utility model embodiment provides an energy-saving system for the heat source of an MVR system, the device comprising:

[0021] The raw liquid component includes a raw liquid tank 11 and a first liquid supply pipe 12, one end of which is connected to the raw liquid tank 11.

[0022] The heat exchange component includes a circulating water heat exchanger 21, a first preheater 22, a second preheater 23, and a third preheater 24. The tubes of the first preheater 22, the second preheater 23, and the third preheater 24 are connected sequentially. The other end of the first liquid supply pipe 12 is connected to one end of the tube of the circulating water heat exchanger 21, and the other end of the tube of the circulating water heat exchanger 21 is connected to the tube of the first preheater 22.

[0023] The processing component includes a circulation component and a distilled water component 32. The circulation component is connected to the third preheater 24 and the distilled water component 32 respectively. One end of the distilled water component 32 is connected to one end of the shell side of the first preheater 22, and the other end of the shell side of the first preheater 22 is connected to one end of the shell side of the circulating water heat exchanger 21.

[0024] In the technical solution provided by this utility model embodiment, the function of the raw liquid component is to transport the raw liquid. The raw liquid component includes a raw liquid tank 11 and a first supply pipe 12, one end of which is connected to the raw liquid tank 11. The function of the heat exchange component is to raise the temperature of the raw liquid. The heat exchange component includes a circulating water heat exchanger 21, a first preheater 22, a second preheater 23, and a third preheater 24. The tubes of the first preheater 22, the second preheater 23, and the third preheater 24 are connected sequentially. The other end of the first supply pipe 12 is connected to the circulating water heat exchanger 21. One end of the tube side of the circulating water heat exchanger 21 is connected to the tube side of the first preheater 22; the function of the treatment component is to treat the raw liquid. The treatment component includes a circulation component and a distillation water component 32. The circulation component is connected to the third preheater 24 and the distillation water component 32 respectively. One end of the distillation water component 32 is connected to one end of the shell side of the first preheater 22, and the other end of the shell side of the first preheater 22 is connected to one end of the shell side of the circulating water heat exchanger 21. Compared with the prior art, after the MVR system has been running for a period of time, the three-stage heat exchanger tubes... Blockages can occur, leading to a decrease in heat exchange. To maintain the inlet temperature of the evaporator chamber, the amount of live steam used will increase, increasing the energy consumption of the unit. Simultaneously, a portion of the distilled water after heat exchange needs to be cooled using circulating water as a refrigerant before being returned to the circulating water system, increasing the load on the circulating water. In this technical solution, the raw material tank 11 and the first supply pipe 12 are connected to one end of the tube side of the circulating water heat exchanger 21, and the other end of the tube side of the circulating water heat exchanger 21 is connected to the first preheater 22. This allows the temperature of the MVR raw material to decrease from 25°C after entering the circulating water heat exchanger 21. The temperature is increased to 42 degrees Celsius, and then the raw liquid undergoes heat exchange through the first preheater 22, the second preheater 23, and the third preheater 24, so that the temperature of the raw liquid reaches the brine temperature required to enter the treatment components. At the same time, the steam only needs to enter the third preheater 24 intermittently for heating, which greatly reduces the amount of steam used. Furthermore, since the distilled water discharged from the first preheater 22 undergoes heat exchange in the circulating water heat exchanger 21, the temperature of the water discharged from the circulating water heat exchanger 21 is reduced to 40 degrees Celsius before entering the cooling water components, which greatly reduces the energy consumption of the system and the load on the circulating water system.

[0025] The aforementioned raw material component functions to transport the raw material. The raw material component includes a raw material tank 11 and a first supply pipe 12. One end of the first supply pipe 12 is connected to the raw material tank 11 for supplying MVR raw material into the circulating water heat exchanger 21. The heat exchange component functions to raise the temperature of the raw material. The heat exchange component includes a circulating water heat exchanger 21, a first preheater 22, a second preheater 23, and a third preheater 24. The tubes of the first preheater 22, the second preheater 23, and the third preheater 24 are connected sequentially. The first supply pipe 12... The other end is connected to one end of the tube side of the circulating water heat exchanger 21, and the other end of the tube side of the circulating water heat exchanger 21 is connected to the tube side of the first preheater 22. The raw liquid enters from the tube side of the circulating water heat exchanger 21, undergoes heat exchange, is discharged, and enters the tube side of the first preheater 22. The first preheater 22 is a distilled water preheater, the second preheater 23 is a non-condensable gas preheater, and the third preheater 24 is a steam preheater. The raw liquid passing through the circulating water heat exchanger 21 enters the first preheater 22, the second preheater 23, and the third preheater 24 in sequence for heating. The processing unit treats the raw liquid. The processing unit includes a circulation unit and a distillation water unit 32. The circulation unit is connected to the third preheater 24 and the distillation water unit 32, respectively. One end of the distillation water unit 32 is connected to one end of the shell side of the first preheater 22, and the other end of the shell side of the first preheater 22 is connected to one end of the shell side of the circulating water heat exchanger 21. After the raw liquid is heated, it enters the circulation unit for treatment. The distilled water produced after treatment enters the distillation water unit 32, and the distilled water output from the distillation water unit 32 enters the third preheater 24. The raw liquid exchanges heat with the preheater 22 and then continues to exchange heat in the circulating water heat exchanger 21, so that the temperature of the raw liquid reaches the brine temperature required to enter the treatment components. At the same time, the steam only needs to enter the third preheater 24 intermittently for heating, which greatly reduces the amount of steam used. Furthermore, since the distilled water discharged from the first preheater 22 exchanges heat in the circulating water heat exchanger 21, the temperature of the water discharged from the circulating water heat exchanger 21 is reduced to 40 degrees Celsius before entering the cooling water components, which greatly reduces the energy consumption of the system and the load on the circulating water system.

[0026] Furthermore, the heat exchange component also includes a condensate component 25, one end of which is connected to the circulating water recovery system, and the other end is connected to the other end of the shell side of the circulating water heat exchanger 21. In this embodiment, the condensate component 25 is added. The function of the condensate component 25 is to store condensate. After heat exchange with the first preheater 22 and the circulating water heat exchanger 21, the distilled water forms condensate and enters the condensate component 25, and then is transported to the circulating water recovery system for recycling. This realizes the full utilization of the heat of the distilled water and greatly reduces the operating load of the circulating water system.

[0027] Furthermore, the circulation component includes a forced circulation heat exchanger 311 and a circulation pump 312. One end of the tube side of the forced circulation heat exchanger 311 is connected to the tube side of the third preheater 24, and the other end is connected to the circulation pump 312. In this embodiment, a circulation component is further defined. The tube side of the forced circulation heat exchanger 311 is connected to the tube side of the third preheater 24, and the other end is connected to the circulation pump 312. The circulation component also includes a crystallizer 314 and a steam compressor 313. One end of the crystallizer 314 is connected to the circulation pump 312, and the other end is connected to the steam compressor 313. The steam compressor 313 is connected to one end of the shell side of the forced circulation heat exchanger 311, and the other end of the shell side of the forced circulation heat exchanger 311 is connected to the distilled water component 32. The raw liquid undergoes heat exchange between the tube side and the shell side of the forced circulation heat exchanger 311, and is then transported to the crystallizer 314 for processing by the circulation pump 312. The steam generated after processing enters the steam compressor 313 for compression, then enters the shell side of the forced circulation heat exchanger 311 for heat exchange, and is then transported to the distilled water component 32 for storage.

[0028] Furthermore, the heat exchange component also includes a non-condensable gas pipe 26, one end of which is connected to the forced circulation heat exchanger 311, and the other end is connected to the shell side of the second preheater 23. In this embodiment, the heat exchange component is further defined. The function of the non-condensable gas pipe 26 is to discharge non-condensable gas. After the steam compressor 313 compresses the steam, it enters the forced circulation heat exchanger 311 for heat exchange, and non-condensable gas is generated. The non-condensable gas enters the shell side of the second preheater 23 through the non-condensable gas pipe 26 to exchange heat with the original liquid in the tube side of the second preheater 23. Optionally, a non-condensable gas heat exchanger 27 is added. The non-condensable gas heat exchanger 27 is connected to the shell side of the second preheater 23. After the non-condensable gas exchanges heat with the original liquid, it enters the non-condensable gas heat exchanger 27 for further heat exchange, and then is discharged from the system.

[0029] Furthermore, the heat exchange component also includes a steam component 28, which is connected to the shell side of the third heat exchanger. In this embodiment, the heat exchange component is further defined. The function of the steam component 28 is to increase the temperature of the raw liquid. A temperature detector is installed at the tube outlet of the non-condensable gas heat exchanger 27. When the temperature of the raw liquid discharged from the tube outlet of the non-condensable gas heat exchanger 27 is insufficient, the steam component 28 is activated to supply steam into the third preheater 24 to increase the temperature of the raw liquid in the third preheater 24, thereby achieving the technical effect of supplementing and increasing the temperature of the raw liquid.

[0030] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A heat source energy-saving system for an MVR system, characterized in that, include: The raw liquid component includes a raw liquid tank and a first supply pipe, one end of which is connected to the raw liquid tank. The heat exchange component includes a circulating water heat exchanger, a first preheater, a second preheater, and a third preheater. The tubes of the first preheater, the second preheater, and the third preheater are connected sequentially. The other end of the first liquid supply pipe is connected to one end of the tube of the circulating water heat exchanger, and the other end of the tube of the circulating water heat exchanger is connected to the tube of the first preheater. The processing component includes a circulation component and a distilled water component. The circulation component is connected to the third preheater and the distilled water component, respectively. One end of the distilled water component is connected to one end of the shell side of the first preheater, and the other end of the shell side of the first preheater is connected to one end of the shell side of the circulating water heat exchanger.

2. The energy-saving system for the heat source of an MVR system according to claim 1, characterized in that, The heat exchange component also includes a condensate component, one end of which is connected to the circulating water recovery system, and the other end is the other end of the shell side of the circulating water heat exchanger.

3. The energy-saving system for the heat source of an MVR system according to claim 2, characterized in that, The circulation component includes a forced circulation heat exchanger and a circulation pump. One end of the tube side of the forced circulation heat exchanger is connected to the tube side of the third preheater, and the other end is connected to the circulation pump.

4. The energy-saving heat source system for an MVR system according to claim 3, characterized in that, The circulation component also includes a crystallizer and a steam compressor. One end of the crystallizer is connected to the circulation pump, and the other end is connected to the steam compressor. The steam compressor is connected to one end of the shell side of the forced circulation heat exchanger, and the other end of the shell side of the forced circulation heat exchanger is connected to the distilled water component.

5. The MVR system heat source energy-saving system according to claim 4, characterized in that, The heat exchange component also includes a non-condensable gas pipeline, one end of which is connected to the forced circulation heat exchanger and the other end of which is connected to the shell side of the second preheater.

6. The energy-saving system for the heat source of an MVR system according to claim 5, characterized in that, Also includes: A non-condensable gas heat exchanger is connected to the shell side of the second preheater.

7. The energy-saving system for the heat source of an MVR system according to claim 5, characterized in that, Also includes: A steam component is connected to the third preheater.

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