An evaporation system

Abstract

This invention discloses an evaporation system designed to address the low thermal efficiency of existing sodium sarcosinate evaporation systems. The system comprises a three-effect evaporator connected in series via a connecting pipe and a steam compressor. The outlet of each evaporator is connected to its inlet. The evaporators use externally supplied steam as their heat source. The steam compressor's outlet connects to the first and third-effect evaporators, the first-effect evaporator's outlet connects to the second-effect evaporator, and the outlets of the second and third-effect evaporators connect to the steam compressor. The use of a three-effect, self-circulating evaporator reduces investment and floor space requirements. The steam compressor's inlet connects to the second and third-effect evaporators, while its outlet connects to the first and third-effect evaporators, achieving efficient heat entropy distribution and improving overall efficiency.

Description

Technical Field

[0001] This utility model relates to the field of evaporation and concentration technology, and more specifically, to an evaporation system. Background Technology

[0002] Sodium sarcosinate, as an important chemical raw material, is widely used in various fields such as daily chemicals, pharmaceuticals, and food. In the daily chemical industry, it is often used as a highly efficient surfactant due to its excellent detergency, emulsification, and solubilization properties, as well as its low skin irritation, making it popular with consumers. In the pharmaceutical field, sodium sarcosinate participates in the synthesis of various drugs, playing a key role in improving drug efficacy and stability. With the vigorous development of various industries, the market demand for sodium sarcosinate products continues to grow, placing higher demands on its quality and production efficiency. In the production process of sodium sarcosinate, the evaporation process is a crucial step in achieving solution concentration and product purification. However, traditional evaporation systems have revealed many problems when processing sodium sarcosinate products. On the one hand, the energy consumption is too high, which not only increases production costs but also contradicts the current environmental protection concept of energy conservation and emission reduction. On the other hand, traditional systems are prone to degradation and impurity contamination of sodium sarcosinate products during the evaporation process, seriously affecting product quality.

[0003] The domestic sodium sarcosinate industry has developed rapidly in recent years, with its market size continuously expanding. Regarding evaporation systems, most companies still use traditional multi-effect evaporation and forced circulation evaporation technologies. Multi-effect evaporation systems are widely used in China, but due to differences in technology and operational management, energy efficiency and product quality vary significantly among different companies. Some small and medium-sized enterprises, due to limitations in capital and technology, have higher energy consumption and their product quality struggles to meet the demands of the high-end market.

[0004] This application aims to provide an evaporation system with low energy consumption for evaporating and concentrating materials with similar chemical and physical properties to sodium sarcosinate, based on the concentration and evaporation of sodium sarcosinate. Utility Model Content

[0005] This invention overcomes the shortcomings of existing sodium sarcosinate evaporation systems, which have low thermal efficiency, and provides an evaporation system that can relatively improve thermal efficiency, thereby achieving energy saving and cost reduction.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] An evaporation system includes a three-effect evaporator connected in series via a connecting pipe and a steam compressor. The outlet of each evaporator is connected to the inlet. The evaporator uses externally supplied steam as a heat source. The steam outlet of the steam compressor is connected to the first and third effect evaporators. The steam outlet of the first effect evaporator is connected to the second effect evaporator. The outlets of the second and third effect evaporators are connected to the steam compressor.

[0008] Advanced mechanical vapor recompression (MVR) technology and falling film evaporation low-temperature evaporation process are introduced. MVR technology compresses secondary steam through a compressor, increasing its temperature and pressure, and then returns it to the evaporator as a heat source, realizing the recycling of steam and reducing the consumption of external steam.

[0009] The three heating steam generators are self-circulating and connected in series through a connecting pipe. The liquid material containing sodium sarcosinate will circulate in the three heating steam generators and gradually move from the first-effect heating steam generator to the third-effect heating steam generator according to the potential energy, forming a continuous feed and discharge evaporation system.

[0010] The system is characterized by using a steam compressor to provide heat energy, and using the steam generated by the second and third effect heating evaporators as a medium. After the steam is compressed to increase its calorific value, it is sent back to the first and third effect heating evaporators.

[0011] The aforementioned steam pipeline connection method effectively utilizes heat and improves the efficiency of heat entropy utilization. For materials and liquids with relatively high temperatures, relatively low-temperature secondary steam is used for heating.

[0012] Preferably, the first and second effect heating evaporators are forced falling film evaporators. The combined use of forced falling film evaporators and steam compressors is suitable for materials with high viscosity and heat sensitivity, such as sodium sarcosinate, and has the advantages of high efficiency, low energy consumption, fast evaporation rate, high heat transfer efficiency, small footprint, and large processing capacity.

[0013] As a preferred option, the third-effect heating evaporator is a forced circulation evaporator. Forced circulation evaporators offer advantages such as strong adaptability, low scaling, high full-tube heat transfer coefficient, fast flow rate, resistance to salt precipitation, continuous operation, long operating cycles, and easy cleaning. They are particularly suitable for concentrating materials with high specific gravity, high viscosity, and easy crystallization. Since the concentration of the material entering the forced circulation evaporator is already relatively high, using a third-effect heating evaporator as a forced circulation evaporator can reduce the probability of scaling.

[0014] Preferably, the outlet of the third-effect evaporator is also connected to a condenser and a vacuum pump. By extracting some of the steam through the condenser and vacuum pump, a negative pressure is created between the third and second-effect evaporators and the first-effect evaporator, guiding the liquid material from the first-effect evaporator to the second and third-effect evaporators.

[0015] Preferably, the system also includes a preheater, which has a first liquid channel and a second liquid channel. The first liquid channel is connected to the material, and the second liquid channel is connected to a condenser. The preheater allows the cooled condensate, which still has a high temperature, to exchange heat with the material, thereby increasing the material's temperature and improving the utilization efficiency of heat entropy.

[0016] Preferably, the heating evaporator includes a heater and a separator. The separator of the third-effect heating evaporator is connected to the inlet of the separator and the crystallization tank via a discharge pump. The separator connects its inlet and outlet, uses the discharge pump for internal circulation, and is also connected to the crystallization tank to provide the crystallization tank with a supersaturated concentration of material for precipitation and crystallization.

[0017] Preferably, the outlet of the separator of the third-effect heating evaporator is connected to the inlet of the heater via a circulating pump.

[0018] Preferably, the heaters of the first, second, and third effect evaporators are also connected to a non-condensable gas condenser. This structure serves to treat the generated non-condensable gas, maintain the overall system pressure, lower the boiling point, and achieve energy savings.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] (1) The use of a triple-effect series self-circulating heating evaporator can relatively reduce investment and floor space;

[0021] (2) The steam compressor inlet is connected to the second and third effect heating evaporators, and the outlet is connected to the first and third effect heating evaporators to achieve efficient distribution of heat entropy and improve efficiency;

[0022] (3) The first and second effects use forced falling film evaporators; the third effect uses forced circulation evaporators. The heating evaporators with more advantages are used in each stage of liquid flow to avoid thermal decomposition of materials and less scaling, thus ensuring the high purity of sodium sarcosinate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the present invention;

[0024] In the picture:

[0025] First-effect evaporator 1, Second-effect evaporator 2, Third-effect evaporator 3, Steam compressor 4, Preheater 5, First liquid channel 6, Second liquid channel 7, Heater 8, Separator 9, Crystallizer tank 10, Condenser 11, Vacuum pump 12, Condenser 13, Non-condensable gas condenser 14 Detailed Implementation

[0026] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] In this disclosure, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely relational terms determined for the convenience of describing the structural relationship of the various components or elements in this disclosure, and do not specifically refer to any component or element in this disclosure, nor should they be construed as limiting this disclosure.

[0030] In this disclosure, terms such as "fixed connection," "connected," and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this disclosure based on the specific circumstances, and they should not be construed as limitations on this disclosure.

[0031] Example:

[0032] An evaporation system, referenced Figure 1The dashed lines represent gas pipelines, and the solid lines represent liquid pipelines. The system includes a three-effect evaporator connected in series via a connecting pipe and a steam compressor 4. The outlet of each evaporator is connected to the inlet. The evaporators use externally supplied steam as a heat source. The steam outlet of the steam compressor 4 is connected to the first-effect evaporator 1 and the third-effect evaporator 3. The steam outlet of the first-effect evaporator 1 is connected to the second-effect evaporator 2. The outlets of the second-effect evaporator 2 and the third-effect evaporator 3 are connected to the steam compressor 4.

[0033] The first-effect evaporator 1 and the second-effect evaporator 2 are forced falling film evaporators. The combined use of forced falling film evaporators and steam compressor 4 is suitable for materials with high viscosity and heat sensitivity, such as sodium sarcosinate, offering advantages such as high efficiency, low energy consumption, fast evaporation rate, high heat transfer efficiency, small footprint, and large processing capacity. The third-effect evaporator 3 is a forced circulation evaporator. Forced circulation evaporators have advantages such as strong adaptability, low scaling, high full-tube heat transfer coefficient, fast flow rate, resistance to salt precipitation, continuous operation, long operating cycle, and easy cleaning, making them particularly suitable for concentrating materials with high specific gravity, high viscosity, and easy crystallization. Since the concentration of the material entering the forced circulation evaporator is already relatively high, using the third-effect evaporator 3 as a forced circulation evaporator can reduce the probability of scaling. Furthermore, fresh steam is supplied to the first-effect evaporator 1 for startup and replenishment.

[0034] The outlet of the third-effect evaporator 3 is also connected to a condenser 11 and a vacuum pump 12. By extracting part of the steam through the condenser 11 and the vacuum pump 12, a negative pressure is created between the third-effect evaporator 3 and the second-effect evaporator 2 and the first-effect evaporator 1, guiding the material liquid from the first-effect evaporator 1 to the second-effect evaporator 2 and the third-effect evaporator 3. A preheater 5 is also included, having a first liquid channel 6 and a second liquid channel 7. The first liquid channel 6 connects to the material, and the second liquid channel 7 connects to the condenser 11. Through the preheater 5, the condensate, which still has a high temperature after cooling, exchanges heat with the material, increasing the material temperature and improving the utilization efficiency of heat entropy. The heaters 8 of the first-effect evaporator 1, the second-effect evaporator 2, and the third-effect evaporator 3 are also connected to a non-condensable gas condenser 14. This structure is used to treat the generated non-condensable gas, maintain the pressure of the entire system, lower the boiling point, and achieve energy saving. Condenser 11 is connected to a condensate tank, and the cooling water in the condensate tank is connected to non-condensable gas condenser 14 to cool the non-condensable gas.

[0035] The heating evaporator includes a heater 8 and a separator 9. The separator 9 of the third-effect heating evaporator 3 is connected to the feed inlet of the separator 9 and the crystal slurry tank 10 via a discharge pump. The separator 9 connects its inlet and outlet, and uses the discharge pump for internal circulation. It is also connected to the crystal slurry tank 10 to provide the crystal slurry tank 10 with a supersaturated concentration of material for precipitation and crystallization. The discharge outlet of the separator 9 of the third-effect heating evaporator 3 is connected to the feed inlet of the heater 8 via a circulation pump.

[0036] The mother liquor detached from the crystal slurry tank 10 is optionally connected to one or more of the first and third effect heating evaporators 3 through pipelines and on / off valves installed on the pipelines, thereby realizing the return of materials.

[0037] Advanced mechanical vapor recompression (MVR) technology and falling film evaporation low-temperature evaporation process are introduced. MVR technology compresses secondary steam through a compressor, increasing its temperature and pressure, and then returns it to the evaporator as a heat source, realizing the recycling of steam and reducing the consumption of external steam.

[0038] The three heating steam generators are self-circulating and connected in series through a connecting pipe. The liquid material containing sodium sarcosinate will self-circulate in the three heating steam generators and gradually move from the first-effect heating evaporator 1 to the third-effect heating evaporator 3 according to the potential energy, forming a continuous feed and discharge evaporation system.

[0039] The system is characterized by using a steam compressor 4 to provide heat energy, using the steam generated by the second and third effect heating evaporators 3 as a medium, and then sending it back to the first and third effect heating evaporators 3 after compressing to increase its calorific value.

[0040] The aforementioned steam pipeline connection method effectively utilizes heat and improves the efficiency of heat entropy utilization. For materials and liquids with relatively high temperatures, relatively low-temperature secondary steam is used for heating.

[0041] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. An evaporation system, characterized in that, It includes a three-effect evaporator connected in series via a connecting pipe and a steam compressor. The outlet of each evaporator is connected to the inlet. The evaporator uses externally supplied steam as a heat source. The steam outlet of the steam compressor is connected to the first and third effect evaporators. The steam outlet of the first effect evaporator is connected to the second effect evaporator. The outlets of the second and third effect evaporators are connected to the steam compressor.

2. The evaporation system according to claim 1, characterized in that, The first and second effect heating evaporators are forced falling film evaporators.

3. The evaporation system according to claim 1, characterized in that, The third-effect heating evaporator is a forced circulation evaporator.

4. An evaporation system according to claim 1, characterized in that, The outlet of the third-effect evaporator is also connected to a condenser and a vacuum pump.

5. An evaporation system according to any one of claims 1 to 4, characterized in that, It also includes a preheater, which has a first liquid channel and a second liquid channel, the first liquid channel being connected to the material and the second liquid channel being connected to the condenser.

6. An evaporation system according to claim 5, characterized in that, The heating evaporator includes a heater and a separator. The separator of the third-effect heating evaporator is connected to the feed inlet of the separator and the crystal slurry tank respectively through a discharge pump.

7. An evaporation system according to claim 6, characterized in that, The outlet of the separator in the third-effect evaporator is connected to the inlet of the heater via a circulating pump.

8. An evaporation system according to claim 1, characterized in that, The heaters of the first, second, and third effect evaporators are also connected to the non-condensable gas condenser.

Images