Single-effect vacuum plate type MVR (mechanical vapor recompression) evaporation system for sucrose concentration

Abstract

The utility model relates to a single-effect vacuum plate type MVR (mechanical vapor recompression) evaporation system for sucrose concentration. The single-effect vacuum plate type MVR evaporation system comprises a plate type evaporator, an MVR compressor, a gas-liquid separator and a condenser which are communicated with one another through pipelines. According to the utility model, the single-effect vacuum plate type MVR evaporation system is adopted to concentrate cane sugar, and meanwhile, the steam flow of the evaporation system is improved, so that steam starts from the MVR compressor, passes through an evaporation steam channel of the plate type evaporator and then returns to the MVR compressor, and meanwhile, a part of steam lost by condensation is supplemented to the MVR compressor through the gas output end of the gas-liquid separator; the whole steam process of sucrose concentration can form steam self-circulation only by inputting steam from the outside during startup, so that the steam consumption is reduced, and the device is suitable for a smaller installation space and ensures lower energy consumption at the same time.

Description

Technical Field

[0001] The utility model belongs to the technical field of plate evaporators, in particular to a single-effect vacuum plate MVR evaporation system for sucrose concentration. Background Art

[0002] Sucrose is the main product of photosynthesis and is widely distributed in plants, especially in beets, sugar cane and fruits. Sucrose concentration is one of the key steps in the sugar production process. Through this step, a variety of sugar products can be produced, such as white sugar, soft white sugar, brown sugar, rock sugar (single crystal rock sugar, multi-crystal rock sugar), sugar cubes, rock flake sugar, etc.

[0003] Evaporation concentration technology is widely used in food, chemical, pharmaceutical, environmental protection and other industries. According to the energy consumption requirements, it can be designed as single-effect evaporation or multi-effect evaporation. Among them, the single-effect concentrator refers to a device that heats the fluid through a hot plate or an external heating heat exchanger to make it reach a boiling state to evaporate water and achieve concentration. The double-effect concentrator is based on the single-effect concentration, and a secondary evaporator is set to evaporate the steam again to achieve more efficient concentration. The heater can choose thermal compression (TVR) or mechanical vapor compression (MVR) heating method.

[0004] The existing technology mainly uses double-effect evaporators, but double-effect evaporators occupy a large area and have high energy consumption. Relatively speaking, single-effect evaporators help reduce product costs, save production space, and reduce energy consumption. Existing single-effect evaporators require continuous input of steam from the outside, and directly discharge it after condensation after evaporation, resulting in huge energy waste. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a single-effect vacuum plate type MVR evaporation system for sucrose concentration, which is suitable for a smaller installation space while ensuring lower energy consumption.

[0006] The technical solution adopted by the utility model to solve the technical problem is: to provide a single-effect vacuum plate MVR evaporation system for sucrose concentration, including a plate evaporator and an MVR compressor, wherein an evaporation medium channel and an evaporation steam channel are arranged in the plate evaporator, the front end of the evaporation medium channel is sequentially communicated with the secondary medium preheating channel of the condensation heat recovery preheater, the primary medium preheating channel of the concentrated liquid heat recovery preheater, a feed pump and an external feed pipeline, the rear end of the evaporation medium channel is communicated with the input port of the gas-liquid separator, the liquid output end of the gas-liquid separator is sequentially communicated with the product discharge pump, the feed primary heating channel of the concentrated liquid heat recovery preheater, the primary heating channel of the product cooling water cooler The secondary medium cooling channel, the secondary medium cooling channel of the product ice water cooler and the concentrated product finished tank are communicated, the gas output end of the gas-liquid separator is respectively communicated with the steam cooling channel of the condenser and the secondary steam input end of the MVR compressor, the front end of the evaporation steam channel is communicated with the steam output end of the MVR compressor, the rear end of the evaporation steam channel is respectively communicated with the input end of the condensation water pump and the steam cooling channel of the condenser, the output end of the steam cooling channel of the condenser is communicated with the input end of the condensation water pump, the output end of the condensation water pump is communicated with the feed secondary heating channel of the condensation heat recovery preheater, and the front end of the evaporation steam channel is communicated with the external steam inlet.

[0007] Preferably, the plate evaporator, condensation heat recovery preheater, concentrate heat recovery preheater, product cooling water cooler, product ice water cooler and condenser are all plate heat exchangers.

[0008] Preferably, the output end of the steam cooling channel of the condenser is also communicated with the vacuum system, and the condensation channel of the condenser is communicated with the cooling water circuit.

[0009] Preferably, the MVR compressor is driven by a motor and is provided with a compressor condensate pump for discharging condensate.

[0010] Preferably, the steam input end of the MVR compressor is communicated with an external steam inlet.

[0011] Preferably, the cooling channel of the product cooling water cooler is communicated with an external cooling water circuit, and the cooling channel of the product ice water cooler is communicated with an external ice water circuit.

[0012] The beneficial effect is that the utility model adopts a single-effect vacuum plate-type MVR evaporation system to concentrate sucrose, and at the same time improves the steam process of the evaporation system, so that the steam starts from the MVR compressor and returns to the MVR compressor after passing through the evaporation steam channel of the plate evaporator. At the same time, a part of the condensed and lost steam is supplemented to the MVR compressor from the gas output end of the gas-liquid separator, so that the entire steam process of sucrose concentration only needs to input steam from the outside when starting up, and steam self-circulation can be formed, thereby reducing steam consumption, being suitable for smaller installation spaces while ensuring lower energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The schematic diagram of the structure of a single-effect vacuum plate MVR evaporation system for sucrose concentration is shown in FIG.

[0014] Among them, 1-plate evaporator; 2-MVR compressor; 3-gas-liquid separator; 4-condenser; 5-vacuum system; 6-condensation heat recovery preheater; 7-concentrate heat recovery preheater; 8-product cooling water cooler; 9-product ice water cooler; 10-feed pump; 11-condensate pump; 12-product discharge pump; 13-compressor condensate pump; 14-concentrated product finished tank; 15-steam inlet; 16-cooling water circuit. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0016] like Figure 1As shown, the utility model provides a single-effect vacuum plate MVR evaporation system for sucrose concentration, comprising a plate evaporator 1 and an MVR compressor 2. The plate evaporator 1 is provided with an evaporation medium channel and an evaporation steam channel. The front end of the evaporation medium channel is sequentially connected to the secondary medium preheating channel of the condensation heat recovery preheater 6, the primary medium preheating channel of the concentrated liquid heat recovery preheater 7, the feed pump 10 and the external feed pipeline. The rear end of the evaporation medium channel is connected to the input port of the gas-liquid separator 3. The liquid output end of the gas-liquid separator 3 is sequentially connected to the product discharge pump 12, the feed primary heating channel of the concentrated liquid heat recovery preheater 7, the primary medium cooling channel of the product cooling water cooler 8, the product The secondary medium cooling channel of the ice water cooler 9 is connected to the concentrated product tank 14, the gas output end of the gas-liquid separator 3 is respectively connected to the steam cooling channel of the condenser 4 and the secondary steam input end of the MVR compressor 2, the front end of the evaporation steam channel is connected to the steam output end of the MVR compressor 2, the rear end of the evaporation steam channel is respectively connected to the input end of the condensation water pump 11 and the steam cooling channel of the condenser 4, the output end of the steam cooling channel of the condenser 4 is connected to the input end of the condensation water pump 11, the output end of the condensation water pump 11 is connected to the feed secondary heating channel of the condensation heat recovery preheater 6, and the front end of the evaporation steam channel is connected to the external steam inlet 15. The end of the feed secondary heating channel of the condensation heat recovery preheater 6 transports the cooled condensed water from the cooling water outlet condensate to the cooling water circuit 16 for recycling.

[0017] The condensing channel of the condenser 4 is in communication with the cooling water circuit 16. The cooling channel of the product cooling water cooler 8 is in communication with the external cooling water circuit 16, and the cooling channel of the product ice water cooler 9 is in communication with the external ice water circuit.

[0018] The steam input end of the MVR compressor 2 is connected to the external steam inlet 15, which is used to provide steam for circulation to the system when the system is first started. The external steam inlet 15 is closed after the system is fully started and the circulation is formed. The product (sucrose dilute solution) passes through the feed pump 10, is preheated by the condensation heat recovery preheater 6 and the concentrated liquid heat recovery preheater 7, and then enters the evaporation medium channel of the plate evaporator 1. The steam heat source in the steam channel of the plate evaporator 1 during the initial startup comes from the external steam inlet 15. After the startup is completed, the steam heat source in the steam channel of the plate evaporator 1 comes from the secondary steam of the gas-liquid separator 3, which is compressed and heated by the MVR compressor 2 and then output. The product that evaporates to the required concentration passes through the discharge pump, the condensate heat recovery plate preheater, the concentrated liquid heat recovery plate preheater, the product cooling water cooler 8, the product ice water cooler 9, and is reduced to the required temperature before entering the concentrated product finished product tank 14.

[0019] In a specific embodiment, the plate evaporator 1, the condensation heat recovery preheater 6, the concentrate heat recovery preheater 7, the product cooling water cooler 8, the product ice water cooler 9 and the condenser 4 are all plate heat exchangers.

[0020] In a specific embodiment, in order to ensure quality, the output end of the steam cooling channel of the condenser 4 is also connected to the vacuum system 5, and the leaked air of the system is sucked out by the vacuum system 5 to ensure the vacuum of the pipeline, and the system operates in low-temperature vacuum.

[0021] In a specific embodiment, the MVR compressor 2 is driven by a motor and is provided with a compressor condensate pump 13. Part of the condensate generated during the operation of the MVR compressor 2 is discharged by the compressor condensate pump 13.

[0022] In a specific embodiment, a one-way valve is provided in the direction of the feed pump 10 flowing toward the concentrated liquid heat recovery preheater 7; after the feed secondary heating channel of the condensation heat recovery preheater 6 exchanges heat with the secondary medium preheating channel, the feed secondary heating channel outputs the cooled condensed water through the one-way valve; and a one-way valve is provided at the discharge port of the compressor condensate pump 13.

Claims

1. A single-effect vacuum plate MVR evaporation system for sucrose concentration, comprising a plate evaporator and an MVR compressor, characterized in that: The plate evaporator is provided with an evaporation medium channel and an evaporation steam channel. The front end of the evaporative medium channel is sequentially connected to the secondary medium preheating channel of the condensation heat recovery preheater, the primary medium preheating channel of the concentrated liquid heat recovery preheater, the feed pump and the external feed pipeline, the rear end of the evaporative medium channel is connected to the input port of the gas-liquid separator, and the liquid output end of the gas-liquid separator is sequentially connected to the product discharge pump, the feed primary heating channel of the concentrated liquid heat recovery preheater, the primary medium cooling channel of the product cooling water cooler, the secondary medium cooling channel of the product ice water cooler and the concentrated product finished product tank. The gas output end of the gas-liquid separator is connected to the steam cooling channel of the condenser and the secondary steam input end of the MVR compressor respectively. The front end of the evaporation steam channel is communicated with the steam output end of the MVR compressor, and the rear end of the evaporation steam channel is communicated with the input end of the condensate pump and the steam cooling channel of the condenser respectively. The output end of the steam cooling channel of the condenser is communicated with the input end of the condensate pump, and the output end of the condensate pump is communicated with the feed secondary heating channel of the condensation heat recovery preheater. The front end of the evaporation steam channel is communicated with an external steam inlet.

2. A single-effect vacuum plate MVR evaporation system for sucrose concentration according to claim 1, characterized in that: The plate evaporator, condensation heat recovery preheater, concentrate heat recovery preheater, product cooling water cooler, product ice water cooler and condenser are all plate heat exchangers.

3. A single-effect vacuum plate MVR evaporation system for sucrose concentration according to claim 1, characterized in that: The output end of the steam cooling channel of the condenser is also communicated with the vacuum system, and the condensation channel of the condenser is communicated with the cooling water circuit.

4. A single-effect vacuum plate MVR evaporation system for sucrose concentration according to claim 1, characterized in that: The MVR compressor is driven by an electric motor and is provided with a compressor condensate pump for discharging condensate.

5. A single-effect vacuum plate MVR evaporation system for sucrose concentration according to claim 1, characterized in that: The steam input end of the MVR compressor is communicated with an external steam inlet.

6. A single-effect vacuum plate MVR evaporation system for sucrose concentration according to claim 1, characterized in that: The cooling channel of the product cooling water cooler is communicated with an external cooling water circuit, and the cooling channel of the product ice water cooler is communicated with an external ice water circuit.

Images