Low temperature heat source vacuum evaporation system

Abstract

This invention discloses a low-temperature heat source vacuum evaporation system, relating to the field of evaporation system technology. It includes: a heat source water tank, a raw liquid tank, a main heater, a vacuum spray evaporation chamber, a vacuum unit, a heat pump unit, and a heat source recovery component. The heat source water tank is connected to the main heater via a hot water pump, the raw liquid tank is connected to the main heater via a raw liquid pump, the main heater is connected to the vacuum spray evaporation chamber, and the vacuum spray evaporation chamber is also connected to the vacuum unit. The heat pump unit is connected to the liquid outlet of the vacuum spray evaporation chamber, and the other end of the heat pump unit is connected to the liquid inlet of the vacuum spray evaporation chamber. The heat source recovery component is disposed between the vacuum unit and the vacuum spray evaporation chamber, with one end connected to the vacuum unit and the other end connected to the vacuum spray evaporation chamber. By incorporating the heat source recovery component, this invention enables the recovery and reuse of water and heat energy within the system, saving costs and reducing losses.

Description

Technical Field

[0001] This invention relates to the field of evaporation system technology, and more specifically to a low-temperature heat source vacuum evaporation system. Background Technology

[0002] Currently, most domestic and international evaporation processes use high-temperature heating evaporation, with evaporation heat source temperatures generally ranging from 150 to 600°C. The exhaust steam temperature after evaporation is higher than 110°C. However, in actual production processes, a large amount of heat from hot water above 40°C cannot be utilized. Even if this part of the hot water is to be recovered and reused, a circulating water cooling system is required, resulting in a double loss of both water and heat sources.

[0003] Therefore, how to provide a low-temperature heat source vacuum evaporation system capable of heat and water recovery is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a low-temperature heat source vacuum evaporation system, which aims to solve the problems in the background art mentioned above and realize heat recovery and water recovery.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A low-temperature heat source vacuum evaporation system includes: a heat source water tank, a raw liquid tank, a main heater, a vacuum spray evaporation chamber, a vacuum unit, a heat pump unit, and a heat source recovery component;

[0007] The heat source water tank is connected to the main heater via a heat source water pump, the raw liquid tank is connected to the main heater via a raw liquid pump, the main heater is connected to the vacuum spray evaporator, and the vacuum spray evaporator is also connected to the vacuum unit;

[0008] The heat pump unit is connected to the liquid outlet of the vacuum spray evaporator, and the other end of the heat pump unit is connected to the liquid inlet of the vacuum spray evaporator.

[0009] The heat source recovery component is disposed between the vacuum unit and the vacuum spray evaporator, with one end of the heat source recovery component connected to the vacuum unit and the other end of the heat source recovery component connected to the vacuum spray evaporator.

[0010] Furthermore, the heat source recovery assembly includes a steam-water heat exchanger, a circulating water cooling tower, and a circulating water pump. One end of the steam-water heat exchanger is connected to the vacuum spray evaporator, and the other end of the steam-water heat exchanger is connected to the vacuum unit. The circulating water cooling tower provides cooling water to the steam-water heat exchanger through the circulating water pump.

[0011] Furthermore, a condensate tank is also connected to the steam-water heat exchanger, and the condensate tank is connected to the steam-water heat exchanger, the circulating water cooling tower, and the heat pump unit respectively.

[0012] Furthermore, the heat pump unit is connected to the heat source recovery component.

[0013] Furthermore, the main heater is connected to the heat source recovery assembly.

[0014] Furthermore, the vacuum spray evaporator includes a housing, a liquid distribution pipe, and nozzles. The liquid distribution pipe and the nozzles are both disposed within the housing. The liquid distribution pipe passes through the housing and communicates with the liquid inlet of the vacuum spray evaporator. Multiple nozzles are provided and are evenly distributed on the liquid distribution pipe. A liquid outlet is provided at the bottom of the housing.

[0015] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a low-temperature heat source vacuum evaporation system. By setting up a heat source recovery component, water and heat energy in the system can be recovered and reused, saving costs and reducing losses. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a low-temperature heat source vacuum evaporation system provided by the present invention.

[0018] Wherein: 1 is the heat source water tank; 2 is the heat source water pump; 3 is the main heater; 4 is the raw liquid pump; 5 is the raw liquid tank; 6 is the steam-water heat exchanger; 7 is the vacuum unit; 8 is the vacuum spray evaporator; 9 is the heat pump unit; 10 is the circulating water cooling tower; 11 is the circulating water pump; 12 is the condensate tank; 13 is the recirculation evaporation pump; 14 is the condensate pump. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] See Figure 1The present invention discloses a low-temperature heat source vacuum evaporation system, including: a heat source water tank 1, a raw liquid tank 5, a main heater 3, a vacuum spray evaporation box 8, a vacuum unit 7, a heat pump unit 9, and a heat source recovery component.

[0021] The heat source water tank 1 is connected to the main heater 3 through the heat source water pump 2, the raw liquid tank 5 is connected to the main heater 3 through the raw liquid pump 4, the main heater 3 is connected to the vacuum spray evaporator 8, and the vacuum spray evaporator 8 is also connected to the vacuum unit 7.

[0022] The heat pump unit 9 is connected to the liquid outlet of the vacuum spray evaporator 8, and the other end of the heat pump unit 9 is connected to the liquid inlet of the vacuum spray evaporator 8; in this embodiment, the heat pump unit 9 and the liquid outlet of the vacuum spray evaporator 8 are connected through the recirculation evaporation pump 13.

[0023] The heat source recovery component is located between the vacuum unit 7 and the vacuum spray evaporator 8. One end of the heat source recovery component is connected to the vacuum unit 7, and the other end of the heat source recovery component is connected to the vacuum spray evaporator 8.

[0024] The heat source recovery assembly includes a steam-water heat exchanger 6, a circulating water cooling tower 10, and a circulating water pump 11. One end of the steam-water heat exchanger 6 is connected to a vacuum spray evaporator 8, and the other end is connected to a vacuum unit 7. The circulating water cooling tower 10 provides cooling water to the steam-water heat exchanger 6 via the circulating water pump 11. In this embodiment, the outlet of the circulating water cooling tower 10 is connected to the steam-water heat exchanger 6 via the circulating water pump 11.

[0025] A condensate tank 12 is also connected to the steam-water heat exchanger 6, which is connected to the steam-water heat exchanger 6, the circulating water cooling tower 10, and the heat pump unit 9. In this embodiment, the condensate tank 12 can condense the water in the steam-water heat exchanger 6 and the circulating water cooling tower 10, and can transport this condensate to the circulating water cooling tower 10 as makeup water under the action of the condensate pump 14.

[0026] The heat pump unit 9 is connected to the heat source recovery assembly; the main heater 3 is also connected to the heat source recovery assembly. In this embodiment, the heat source recovery assembly can provide heat to the heat pump unit 9 and the main heater 3, enabling the recovery and reuse of heat.

[0027] The vacuum spray evaporator 8 includes a box body, a liquid distribution pipe, and nozzles. The liquid distribution pipe and nozzles are both located inside the box body. The liquid distribution pipe passes through the box body and is connected to the liquid inlet of the vacuum spray evaporator 8. Multiple nozzles are provided and are evenly distributed on the liquid distribution pipe. A liquid outlet is provided at the bottom of the box body.

[0028] This low-temperature heat source vacuum evaporation system uses hot water from other processes as a heat source to heat the liquid to be evaporated. Since hot water is generally below 70°C, the evaporation of the system needs to be completed under vacuum. This low-temperature heat source vacuum evaporation system can improve vacuum evaporation capacity and ensure evaporation efficiency. The system heats the liquid to be evaporated with a low-temperature heat source. After the liquid is heated to a certain temperature, it enters the spray evaporation tank for sealed vacuum evaporation. The actual system design needs to select the form of the main heater 3 or adopt an indirect heating method to heat the liquid to be evaporated based on the medium carried by the low-temperature heat source. Since a low-temperature evaporation method is used, the system is equipped with a condensing steam-water heat exchanger 6, a vacuum unit 7, and a circulating cooling water system. In addition, the system is equipped with a heat pump unit 9 to recover the heat of the relevant water. In this system, the most important function of the heat pump unit 9 is to provide low-temperature cooling water to the vacuum unit 7 when the water temperature is high in summer.

[0029] The system uses hot water from the heat source tank 1 as a heat source to heat the raw liquid to be dried from the raw liquid tank 5 through the main heater 3, and heats the raw liquid to the specified temperature in the vacuum spray evaporation box 8 for circulating spray drying.

[0030] The heat source water in the heat source water tank 1 is heated by the main heater 3. After the heat source water is cooled, it is reused, sent to the circulating water cooling tower 10 as circulating water replenishment water, and sent to the heat pump unit 9 as heat source water for the heat pump unit 9. The heat source water discharged from the heat pump unit 9 is divided into two paths: one path returns to the heat source water system for reuse, and the other path enters the water pool of the circulating water cooling tower 10 to become the cooling water for the steam-water heat exchanger 6.

[0031] The evaporator, heated by the main heater 3 and the heat pump unit 9, is atomized and evaporated in the vacuum spray evaporator 8. The evaporated water vapor enters the steam-water heat exchanger 6, where it is cooled and condensed into water by the circulating cooling water from the circulating water cooling tower 10, forming a vacuum. The non-condensable gases in the vacuum are extracted by the vacuum unit 7 and discharged into the atmosphere.

[0032] The low-temperature vacuum evaporation capacity of the vacuum evaporation system comes from the temperature of the circulating cooling water in the circulating water cooling tower 10. Therefore, the selection of the circulating water cooling tower 10 is one of the key tasks in the equipment configuration of this system. In addition, the low-temperature heat source water discharged by the heat pump unit 9 is lower than the temperature of the circulating cooling water, which can further reduce the temperature of the circulating cooling water. It should also be noted that in order to ensure the efficient operation of the vacuum unit 7, the main purpose of the cold water discharged by the heat pump unit 9 is to be used as the condensate of the vacuum unit 7.

[0033] The recirculating evaporation pump 13 can send the evaporating liquid in the vacuum spray evaporation box 8 to the heat pump unit 9 and the main heater 3 to circulate and heat the evaporating liquid until the evaporating liquid is evaporated to the concentration designed by the system.

[0034] The steam evaporated in the vacuum spray evaporator 8 enters the steam-water heat exchanger 6 and is cooled by the circulating cooling water, resulting in condensate. This condensate has the quality of distilled water and can be directly reused. In this system, this condensate is mainly used as supplementary water for the circulating cooling water. However, the temperature of this condensate is relatively high. In summer, when the temperature is high, the condensate first enters the condensate tank 12 and is then sent by the condensate pump 14 to the circulating cooling tower 10 for cooling before entering the cooling cycle. The system design connects the condensate to the cooling tower. In winter, when the water temperature is low, it can flow directly to the cooling tower's water pool by gravity.

[0035] Condensate is used as makeup water for the circulating water system as part of the overall system water balance design: when the condensate cannot meet the needs of the circulating water makeup water, the cold water discharged by the heat pump unit 9 can make up for it; conversely, when there is excess water in the circulating cooling water system, the system can return the excess water to the heat source water system.

[0036] This low-temperature heat source vacuum evaporation system uses low-temperature hot water as the heating source and uses circulating cooling water and vacuum unit 7 to form and maintain a vacuum low-temperature environment formed by the condensation of evaporating steam. This allows the heat generated by the low-temperature heat source water in the process to be fully utilized, replacing high-grade energy with low-grade energy, and realizing the recovery and utilization of waste heat of the enterprise, which has the dual benefits of environmental protection and carbon reduction.

[0037] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low-temperature heat source vacuum evaporation system, characterized in that, include: Heat source water tank, raw liquid tank, main heater, vacuum spray evaporator, vacuum unit, heat pump unit and heat source recovery components; The heat source water tank is connected to the main heater via a heat source water pump, the raw liquid tank is connected to the main heater via a raw liquid pump, the main heater is connected to the vacuum spray evaporation box, and the vacuum spray evaporation box is also connected to the vacuum unit; The heat pump unit is connected to the liquid outlet of the vacuum spray evaporator, and the other end of the heat pump unit is connected to the liquid inlet of the vacuum spray evaporator. The heat source recovery component is disposed between the vacuum unit and the vacuum spray evaporation box, with one end of the heat source recovery component connected to the vacuum unit and the other end of the heat source recovery component connected to the vacuum spray evaporation box; The vacuum spray evaporator includes a box body, a liquid distribution pipe, and nozzles. The liquid distribution pipe and the nozzles are both located inside the box body. The liquid distribution pipe passes through the box body and communicates with the liquid inlet of the vacuum spray evaporator. Multiple nozzles are provided and are evenly distributed on the liquid distribution pipe. A liquid outlet is provided at the bottom of the box body. The heat source recovery assembly includes a steam-water heat exchanger, a circulating water cooling tower, and a circulating water pump. One end of the steam-water heat exchanger is connected to the vacuum spray evaporator, and the other end of the steam-water heat exchanger is connected to the vacuum unit. The circulating water cooling tower provides cooling water to the steam-water heat exchanger through the circulating water pump. The steam-water heat exchanger is also connected to a condensate tank, which is connected to the steam-water heat exchanger, the circulating water cooling tower, and the heat pump unit.

2. The low-temperature heat source vacuum evaporation system according to claim 1, characterized in that, The heat pump unit is connected to the heat source recovery component.

3. The low-temperature heat source vacuum evaporation system according to claim 1, characterized in that, The main heater is connected to the heat source recovery assembly.

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