Steam waste heat recovery device of multi-effect concentration system

Abstract

The utility model discloses a steam waste heat recovery device of a multi-effect concentration system, which belongs to the technical field of energy conservation of chemical equipment and comprises a first-effect heating tank, a second-effect heating tank, a third-effect heating tank and a fourth-effect heating tank, a control cabinet is arranged on one side of the device, and the first-effect heating tank, the second-effect heating tank, the third-effect heating tank and the fourth-effect heating tank are sequentially distributed from right to left. The outer ends of the first-effect heating tank, the second-effect heating tank, the third-effect heating tank and the fourth-effect heating tank are connected with a steam pipeline, the outer end of the steam pipeline is connected with a steam compressor and a cooling heat exchanger, the outer end of the steam compressor is connected with a steam heat exchanger, the outer end of the cooling heat exchanger is provided with a condensate water tank, and a condensate water pipeline is connected between the cooling heat exchanger and the condensate water tank. The tail-effect steam waste heat of the multi-effect concentration system can be recycled through the steam compressor and used for heating concentrated liquid, the steam consumption of the first-effect heating tank can be reduced, the load of a cooling system is reduced, the overall heat efficiency is improved, and the obvious energy-saving and emission-reducing effects are achieved.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving technology for chemical equipment, and more specifically, to a steam waste heat recovery device for a multi-effect concentration system. Background Technology

[0002] In many industrial fields such as chemical, pharmaceutical, and food processing, multi-effect concentration systems are a widely used key piece of equipment. They are mainly used to concentrate liquid materials to remove some of the water or other solvents, thereby increasing the concentration and purity of the materials to meet the requirements of subsequent production or storage. Multi-effect concentration systems usually consist of multiple heating tanks connected in series. Each heating tank uses steam as a heat source to heat and evaporate the material inside the tank, thus realizing the concentration process.

[0003] In traditional multi-effect heat concentration systems, steam releases heat in the first-effect heater, and its temperature and pressure gradually decrease before entering subsequent heaters for continued utilization, thus achieving multi-stage energy recovery and utilization. However, during system operation, the steam discharged from the last-effect heater is usually low-temperature and low-pressure steam. This steam contains a certain amount of residual heat, but due to its low temperature and pressure, it is difficult to directly reuse it in the heating process. It is often directly discharged into the atmosphere or cooled by the cooling system. This not only wastes a lot of thermal energy and increases energy consumption, but also increases the load on the cooling system, leading to increased cooling water consumption, further increasing production costs and environmental pressure.

[0004] Therefore, developing a steam waste heat recovery device for a multi-effect concentration system that is simple in structure, low in cost, highly efficient in recovery, and capable of effectively controlling the temperature of the concentrate has significant practical significance and application value. This utility model is designed based on this need. By using a steam compressor to compress and recover the steam in the last effect and using a steam heat exchanger to preheat the concentrate, the efficient recovery and utilization of steam waste heat is achieved. At the same time, by setting monitoring devices such as temperature sensors and flow sensors, real-time monitoring and precise control of system operating parameters are realized. This effectively solves the problems of energy waste, high cooling system load, and unstable product quality in traditional multi-effect concentration systems, providing an effective solution for energy conservation and emission reduction in industrial production. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a steam waste heat recovery device for a multi-effect concentration system. It can recover the steam waste heat of the last effect of the multi-effect concentration system using a steam compressor for heating the concentrate. This can reduce the steam consumption of the first-effect heating tank, reduce the load on the cooling system, improve the overall thermal efficiency, and has significant energy-saving and emission-reduction effects.

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

[0007] A steam waste heat recovery device for a multi-effect concentration system includes a first-effect heating tank, a second-effect heating tank, a third-effect heating tank, and a fourth-effect heating tank. A control cabinet is located on one side of the device. The first-effect heating tank, the second-effect heating tank, the third-effect heating tank, and the fourth-effect heating tank are arranged sequentially from right to left. Steam pipes are connected to the outer ends of the first-effect heating tank, and steam compressors and cooling heat exchangers are connected to the outer ends of the steam pipes. A condensate tank is located at the outer end of the steam compressor, and a condensate pipe is connected between the cooling heat exchanger and the condensate tank. A concentrate inlet is connected to the outer end of the first-effect heating tank, and a concentrate return pipe and a concentrate delivery pipe are connected between the concentrate inlet and the steam heat exchanger. This device can recover the waste heat of the last effect steam in the multi-effect concentration system using a steam compressor for heating the concentrate. This reduces the steam consumption of the first-effect heating tank, reduces the load on the cooling system, improves the overall thermal efficiency, and has significant energy-saving and emission-reduction effects.

[0008] As a further embodiment of this utility model: wherein, the first-effect heating tank, the second-effect heating tank, the third-effect heating tank and the fourth-effect heating tank are all provided with steam condensate outlets at their upper ends, the steam condensate outlets are connected to steam pipes, and the first-effect heating tank, the second-effect heating tank, the third-effect heating tank and the fourth-effect heating tank are all provided with steam inlets at their right ends.

[0009] As a further improvement of this utility model, a steam valve is installed at the outer end of the steam condensate outlet.

[0010] As a further improvement of this utility model, temperature sensors and flow sensors are installed at the outer ends of both the concentrate return pipe and the concentrate delivery pipe.

[0011] As a further improvement of this utility model, the bottom of the first-effect heating tank, the second-effect heating tank, the third-effect heating tank and the fourth-effect heating tank are all provided with a drain port, and the outer end of the drain port is connected to a drain pipe.

[0012] As a further improvement of this utility model, a drain valve is installed at the outer end of the drain outlet.

[0013] Compared with existing technologies, the advantages of this utility model are:

[0014] 1. This device recovers low-temperature, low-pressure steam discharged from the final heating tank of the multi-effect concentrator system using a steam compressor, compresses it into high-temperature, high-pressure steam, and uses it to preheat the concentrate entering the first heating tank. This process makes full use of the originally wasted steam waste heat, effectively reduces the consumption of fresh steam by the first heating tank, and reduces energy waste. At the same time, because the waste heat load that the cooling system needs to handle is reduced, the consumption of cooling water is reduced, thereby achieving significant energy saving and emission reduction effects, which meet the current requirements of industrial production for energy conservation and environmental protection.

[0015] 2. The device is equipped with temperature and flow sensors on the return and delivery pipelines of the concentrate, which can monitor the temperature and flow changes of the concentrate in real time. The control cabinet processes the data collected by these sensors and outputs control signals to adjust the operating parameters of the steam compressor and the opening degree of the flow sensor, thereby achieving precise control of the concentrate temperature. Precise temperature control can prevent the concentrate from affecting product quality due to excessive temperature fluctuations, ensure the stability and consistency of product quality, and improve the market competitiveness of the product.

[0016] 3. The steam waste heat recovery device has a relatively simple structure, requiring no additional complex heat exchange equipment or a large number of piping systems, thus reducing the investment cost and floor space. At the same time, by effectively recovering and utilizing steam waste heat, it reduces the consumption of fresh steam and the use of cooling water, thereby reducing energy and water resource costs. In addition, because it can monitor system operating parameters in real time, it can promptly identify and resolve potential problems, reducing the probability of equipment failure, lowering maintenance costs and difficulty, and improving the reliability and service life of the system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Explanation of the labels in the diagram:

[0019] 1. First-effect heating tank; 2. Second-effect heating tank; 3. Third-effect heating tank; 4. Fourth-effect heating tank; 5. Steam compressor; 6. Steam heat exchanger; 7. Cooling heat exchanger; 8. Condensate tank; 9. Steam inlet; 10. Steam / condensate outlet; 11. Steam valve; 12. Concentrate inlet; 13. Concentrate return pipe; 14. Concentrate delivery pipe; 15. Temperature sensor; 16. Flow sensor; 17. Drain valve; 18. Drain outlet; 19. Drain pipe; 20. Steam pipe; 21. Condensate pipe; 22. Control cabinet. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0023] Please see Figure 1 A steam waste heat recovery device for a multi-effect heat concentration system includes a first-effect heating tank 1, a second-effect heating tank 2, a third-effect heating tank 3, and a fourth-effect heating tank 4. A control cabinet 22 is located on one side of the device. The first-effect heating tank 1, second-effect heating tank 2, third-effect heating tank 3, and fourth-effect heating tank 4 are arranged sequentially from right to left. Steam pipes 20 are connected to the outer ends of the first-effect heating tank 1, second-effect heating tank 2, third-effect heating tank 3, and fourth-effect heating tank 4. Steam compressors 5 and cooling heat exchangers 7 are connected to the outer ends of the steam pipes 20. Steam heat exchangers 6 are connected to the outer ends of the steam compressors 5. The cooling heat exchanger 7 is equipped with a condensate tank 8 at its outer end. A condensate pipe 21 connects the cooling heat exchanger 7 and the condensate tank 8. The first-effect heating tank 1 is connected to a concentrate inlet 12 at its outer end. A concentrate return pipe 13 and a concentrate delivery pipe 14 connect the concentrate inlet 12 and the steam heat exchanger 6. This allows the use of a steam compressor to recover the waste heat of the last-effect steam in the multi-effect concentration system for heating the concentrate. This reduces the steam consumption of the first-effect heating tank, reduces the load on the cooling system, and improves the overall thermal efficiency, resulting in significant energy saving and emission reduction effects.

[0024] The first-effect heating tank 1, the second-effect heating tank 2, the third-effect heating tank 3 and the fourth-effect heating tank 4 are all equipped with steam condensate outlets 10 at their upper ends. The steam condensate outlets 10 are connected to the steam pipes 20. The first-effect heating tank 1, the second-effect heating tank 2, the third-effect heating tank 3 and the fourth-effect heating tank 4 are all equipped with steam inlets 9 at their right ends. A steam valve 11 is installed at the outer end of the steam condensate outlets 10.

[0025] Temperature sensor 15 and flow sensor 16 are installed at the outer ends of the concentrate return pipe 13 and concentrate delivery pipe 14. Drainage outlet 18 is provided at the bottom of the first-effect heating tank 1, the second-effect heating tank 2, the third-effect heating tank 3 and the fourth-effect heating tank 4. Drainage pipe 19 is connected to the outer end of the drainage outlet 18, and drainage valve 17 is installed at the outer end of the drainage outlet 18.

[0026] Working principle: This utility model utilizes a steam compressor 5 to recover the low-temperature, low-pressure steam discharged from the four-effect heating tank 4, compresses it into high-temperature, high-pressure steam, and then introduces it into a steam heat exchanger 6 to preheat the concentrate entering the first-effect heating tank 1. When the concentrate temperature reaches the set value, the regulating valve automatically diverts part of the steam. The system collects data from temperature sensor 15 and flow sensor 16, processes the data through control cabinet 22, and outputs control signals to adjust the operating parameters of the steam compressor 5 and the opening of the flow sensor 16. By utilizing the steam compressor 5 to recover the waste heat of the last-effect steam in the multi-effect concentration system for heating the concentrate, the steam consumption of the first-effect heating tank 1 can be reduced, the load on the cooling system can be reduced, and the overall thermal efficiency can be improved, resulting in significant energy saving and emission reduction effects.

[0027] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A steam waste heat recovery device for a multi-effect heat concentration system, comprising a first-effect heating tank (1), a second-effect heating tank (2), a third-effect heating tank (3), and a fourth-effect heating tank (4), characterized in that, A control cabinet (22) is provided on one side of the device. The first-effect heating tank (1), the second-effect heating tank (2), the third-effect heating tank (3) and the fourth-effect heating tank (4) are arranged from right to left. The first-effect heating tank (1), the second-effect heating tank (2), the third-effect heating tank (3) and the fourth-effect heating tank (4) are connected to a steam pipe (20). The steam pipe (20) is connected to a steam compressor (5) and a cooling heat exchanger (7). The steam compressor (5) is connected to a steam heat exchanger (6). The cooling heat exchanger (7) is provided with a condensate tank (8). The cooling heat exchanger (7) and the condensate tank (8) are connected by a condensate pipe (21). The first-effect heating tank (1) is connected to a concentrate inlet (12). The concentrate inlet (12) and the steam heat exchanger (6) are connected by a concentrate return pipe (13) and a concentrate delivery pipe (14).

2. The steam waste heat recovery device for a multi-effect concentration system according to claim 1, characterized in that, The first-effect heating tank (1), the second-effect heating tank (2), the third-effect heating tank (3) and the fourth-effect heating tank (4) are all provided with steam condensate outlets (10) at their upper ends. The steam condensate outlets (10) are connected to the steam pipe (20). The first-effect heating tank (1), the second-effect heating tank (2), the third-effect heating tank (3) and the fourth-effect heating tank (4) are all provided with steam inlets (9) at their right ends.

3. The steam waste heat recovery device for a multi-effect concentration system according to claim 2, characterized in that, A steam valve (11) is installed at the outer end of the steam condensate outlet (10).

4. The steam waste heat recovery device for a multi-effect concentration system according to claim 1, characterized in that, Temperature sensor (15) and flow sensor (16) are installed at the outer ends of both the concentrate return pipe (13) and the concentrate delivery pipe (14).

5. The steam waste heat recovery device for a multi-effect concentration system according to claim 1, characterized in that, The bottom of the first-effect heating tank (1), the second-effect heating tank (2), the third-effect heating tank (3) and the fourth-effect heating tank (4) are all provided with a drain port (18), and the outer end of the drain port (18) is connected to a drain pipe (19).

6. The steam waste heat recovery device for a multi-effect concentration system according to claim 5, characterized in that, A drain valve (17) is installed at the outer end of the drain outlet (18).

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