Mvr vacuum pan dryer system

Abstract

The utility model relates to a kind of MVR vacuum disc type scraper drying system, the secondary steam outlet of vacuum disc type scraper dryer is communicated with the shell side import of heat exchanger, the inlet of vacuum pump is communicated with the shell side export of heat exchanger, the import of circulating pump is communicated with the tube side discharge port of heat exchanger, the import of heat exchanger tube side is communicated with the outlet of circulating pump, the import of circulating pump is communicated with the outlet of vacuum disc type scraper dryer condensate, the gas outlet of heat exchanger tube side is communicated with the import of separator, the import of steam compressor is communicated with the steam outlet of separator separation, the import of vacuum disc type scraper dryer is communicated with the gas outlet of steam compressor, the utility model uses the secondary steam generated in the drying process of vacuum disc type scraper dryer to heat condensate, so that condensate generates pure saturated steam again, saturated steam is sent into vacuum disc type scraper dryer again after being pressurized and heated by mechanical steam compressor, realize the recycling of secondary steam and condensate, can reduce the use amount of live steam, reduce energy consumption, reduce cost.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, specifically to an MVR vacuum disc scraper drying system. Background Technology

[0002] Vacuum disc dryers, as important drying equipment, are widely used in many industries such as chemical, food, and pharmaceutical. Their working principle involves introducing steam into hollow drying discs. The heat from the steam is transferred to the wet material through the discs, causing the wet material to heat up and the moisture to evaporate, thus drying the material. This drying process has advantages such as continuous material conveying, high heat transfer efficiency, high drying rate, controllable temperature distribution, good product quality, small footprint, low pollution, and convenient management. It is especially suitable for drying heat-sensitive materials.

[0003] However, existing vacuum disc scraper dryers consume a large amount of steam. In actual operation, to maintain the required drying temperature, a large volume of steam needs to be continuously supplied to the drying discs. This high steam consumption not only increases energy and production costs for enterprises but also puts greater pressure on the environment, as the generation of large amounts of steam is often accompanied by increased energy consumption and greenhouse gas emissions. Furthermore, excessive steam consumption may affect the operational stability of the equipment, increasing the frequency and cost of maintenance. For example, it may cause components such as steam pipes and valves to be more prone to damage due to frequent exposure to high pressure and high temperature, thus affecting the continuity and reliability of the entire production process. In addition, in production scenarios with limited energy supply or extremely strict cost control requirements, the high steam consumption problem may become a key factor restricting the widespread application of vacuum disc scraper dryers.

[0004] In addition, during the actual operation of the vacuum disc scraper dryer, the secondary steam generated during the drying of wet materials is at a high temperature and contains dust. If the secondary steam is directly discharged into the atmosphere, it will not only waste heat, but the dust in the secondary steam will also pollute the environment. Therefore, the secondary steam discharged from the vacuum disc tube sheet dryer usually needs to be condensed into condensate and then discharged after wastewater treatment. The heat in the secondary steam cannot be utilized, resulting in heat loss and energy waste. Utility Model Content

[0005] In summary, to overcome the shortcomings of existing technologies, this utility model provides an MVR vacuum disc scraper drying system. It recovers the secondary steam and condensate discharged during the vacuum disc scraper dryer process, uses the recovered secondary steam to heat the condensate, and generates pure saturated steam again. The saturated steam is then pressurized and heated by a mechanical steam compressor and reintroduced into the vacuum disc scraper dryer. This achieves the recovery and reuse of heat from the secondary steam and condensate. After the system stabilizes, live steam is only used as supplementary steam, effectively reducing the amount of live steam used, decreasing energy consumption, and lowering drying costs.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: An MVR vacuum disc scraper drying system includes: a vacuum disc scraper dryer for drying wet materials; the secondary steam outlet of the vacuum disc scraper dryer is connected to the shell-side inlet of a heat exchanger via a pipeline; the shell-side outlet of the heat exchanger is connected to the inlet of a vacuum pump via a pipeline; and the outlet of the vacuum pump is vented. The tube-side outlet of the heat exchanger is connected to the inlet of the circulating pump, and the outlet of the circulating pump is connected to the tube-side inlet of the heat exchanger. The condensate outlet of the vacuum disc scraper dryer is connected to the inlet of the circulating pump through a pipeline. The tube-side outlet of the heat exchanger is connected to the inlet of the separator. The separated steam outlet of the separator is connected to the inlet of the steam compressor through a pipeline. The liquid outlet of the separator is connected to the inlet of the circulating pump. The outlet of the steam compressor is connected to the inlet of the vacuum disc scraper dryer.

[0007] Furthermore, the air inlet of the vacuum disc scraper dryer is connected to an air inlet pipeline, which is connected to the air outlet of the steam compressor and the air outlet of the jet heat pump. The air inlet of the jet heat pump is connected to a steam source through a live steam pipeline, and a live steam valve is installed on the live steam pipeline.

[0008] Furthermore, the condensate outlet of the vacuum disc scraper dryer is connected to the inlet of the condensate storage tank via a pipeline, the outlet of the condensate storage tank is connected to the inlet of the condensate pump via a pipeline, the outlet of the condensate pump is connected to the inlet of the circulating pump via a pipeline, and the air outlet of the condensate storage tank is connected to the air inlet of the jet heat pump via a pipeline.

[0009] Furthermore, a condensate valve is installed on the pipeline connecting the outlet of the condensate pump and the inlet of the circulation pump, and a condensate level gauge is installed on the condensate storage tank to monitor the liquid level inside the condensate storage tank. The condensate level gauge is electrically connected to the condensate valve, and the condensate valve is adjusted by controlling the liquid level inside the condensate storage tank.

[0010] Furthermore, there are multiple steam compressors connected in series.

[0011] Furthermore, the heat exchanger has a condensate outlet connected to the shell side of the heat exchanger, the condensate outlet is connected to the inlet of a secondary condensate tank via a pipeline, the outlet of the secondary condensate tank is connected to the inlet of a secondary condensate pump, the outlet of the secondary condensate pump is connected to a drain pipeline, and the vent of the secondary condensate tank is connected to the tube side of the heat exchanger.

[0012] Furthermore, the secondary condensate tank is equipped with a secondary condensate level gauge to monitor the liquid level inside the tank, and a drain valve is installed on the drain pipe. The drain valve is electrically connected to the secondary condensate level gauge, and the drain valve is adjusted by controlling the liquid level inside the secondary condensate tank.

[0013] Furthermore, the feed inlet of the vacuum disc scraper dryer is connected to the discharge outlet of the plate preheater via a pipeline, the feed inlet of the plate preheater is connected to a wet material source, the preheating medium inlet of the plate preheater is connected to a drainage pipeline, and the preheating medium outlet of the plate preheater discharges wastewater.

[0014] Furthermore, the preheating medium inlet of the plate preheater is connected to the outlet of the circulating pump through a drain pipe. A drain valve is installed on the drain pipe. The heat exchanger is equipped with a heat exchange level gauge for monitoring the heat exchanger tube side. The heat exchange level gauge is electrically connected to the drain valve, and the drain valve is adjusted by controlling the liquid level in the heat exchanger tube side.

[0015] Furthermore, the heat exchanger is equipped with a pressure sensor that monitors the shell-side pressure of the heat exchanger. The pipeline connecting the outlet of the heat exchanger to the inlet of the vacuum pump is connected to a pressure regulating pipeline, which is connected to the atmosphere. A pressure regulating valve is installed on the pressure regulating pipeline, and the pressure sensor is electrically connected to the pressure regulating valve. The pressure regulating valve is adjusted by controlling the shell-side pressure of the heat exchanger.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. This utility model recovers the secondary steam and condensate discharged during the vacuum disc scraper dryer process, and uses the recovered secondary steam to heat the condensate, so that the condensate generates pure saturated steam again. The saturated steam is pressurized and heated by a mechanical steam compressor and then sent back to the vacuum disc scraper dryer, realizing the recovery and reuse of heat and condensate in the secondary steam. After the system is running stably, the live steam is only used as supplementary steam, which can effectively reduce the amount of live steam used, reduce energy consumption, and reduce drying costs.

[0018] 2. This utility model has a plate preheater, which uses the residual heat in the secondary condensate after the secondary steam in the shell side of the heat exchanger is cooled and condensed to heat the wet material, thereby achieving the purpose of preheating the wet material, recovering the heat in the secondary condensate, and reducing the energy consumption during the drying process of the wet material.

[0019] 3. The present invention uses multiple steam compressors connected in series. By connecting multiple steam compressors in series, the saturated steam can be raised to a higher temperature, thereby increasing the temperature of the saturated steam entering the vacuum disc scraper dryer and improving the drying efficiency of wet materials.

[0020] 4. This utility model has a simple structure, is easy to use, has a novel design, and is inexpensive. It can effectively improve the drying efficiency of wet materials, reduce the amount of steam used during the drying of wet materials, reduce energy consumption, reduce the cost of drying wet materials, reduce the burden on enterprises, and at the same time avoid environmental pollution caused by the emission of high-temperature exhaust gas into the atmosphere. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] like Figure 1 As shown, an MVR vacuum disc scraper drying system includes: a vacuum disc scraper dryer 1 for drying wet materials; the secondary steam outlet of the vacuum disc scraper dryer 1 is connected to the shell-side inlet of a heat exchanger 2 via a pipeline; the shell-side outlet of the heat exchanger 2 is connected to the inlet of a vacuum pump 3 via a pipeline; the outlet of the vacuum pump 3 is vented; the tube-side outlet of the heat exchanger 2 is connected to the inlet of a circulating pump 4; the outlet of the circulating pump 4 is connected to the tube-side inlet of the heat exchanger 2; and the condensate outlet of the vacuum disc scraper dryer 1 is connected to the inlet of a condensate storage tank 9 via a pipeline. The outlet of the condensate storage tank 9 is connected to the inlet of the condensate pump 10 via a pipeline. The outlet of the condensate pump 10 is connected to the inlet of the circulation pump 4 via a pipeline. The air outlet of the condensate storage tank 9 is connected to the air inlet of the jet heat pump 6 via a pipeline. A condensate valve 11 is installed on the pipeline connecting the outlet of the condensate pump 10 and the inlet of the circulation pump 4. A condensate level gauge 12 is installed on the condensate storage tank 9 to monitor the liquid level inside the condensate storage tank 9. The condensate level gauge 12 is electrically connected to the condensate valve 11, and the condensate valve 11 is adjusted by controlling the liquid level inside the condensate storage tank 9.

[0024] The tube outlet of the heat exchanger 2 is connected to the inlet of the separator 5. The separated steam outlet of the separator 5 is connected to the inlet of the first steam compressor 25 via a pipeline. The outlet of the first steam compressor 25 is connected to the inlet of the second steam compressor 26. The outlet of the second steam compressor 26 is connected to the inlet of the vacuum disc scraper dryer 1. The liquid outlet of the separator 5 is connected to the inlet of the circulating pump 4. The inlet of the vacuum disc scraper dryer 1 is connected to an inlet pipeline. The inlet pipeline is connected to the outlet of the steam compressor and the outlet of the jet heat pump 6. The inlet of the jet heat pump 6 is connected to the steam source 7 via a live steam pipeline. A live steam valve 8 is installed on the live steam pipeline.

[0025] The heat exchanger 2 has a condensate outlet connected to the shell side of the heat exchanger 2. The condensate outlet is connected to the inlet of the secondary condensate tank 13 via a pipeline. The outlet of the secondary condensate tank 13 is connected to the inlet of the secondary condensate pump 14. The outlet of the secondary condensate pump 14 is connected to the preheating medium inlet of the plate preheater 18 via a drain pipeline 16. Wastewater is discharged from the preheating medium outlet of the plate preheater 18. The feed inlet of the plate preheater 18 is connected to the wet material source 19. The discharge outlet of the plate preheater 18 is connected to the feed inlet of the vacuum disc scraper dryer 1 via a pipeline. The vent of the secondary condensate tank 13 is connected to the tube side of the heat exchanger 2. The secondary condensate tank 13 is equipped with a secondary condensate level gauge 15 to monitor the liquid level inside the secondary condensate tank 13. A drain valve 17 is installed on the drain pipeline 16. The drain valve 17 is electrically connected to the secondary condensate level gauge 15. The drain valve 17 is adjusted by controlling the liquid level inside the secondary condensate tank 13.

[0026] The preheating medium inlet of the plate preheater 18 is also connected to the outlet of the circulating pump 4 via a drain pipe. A drain valve 20 is installed on the drain pipe. The heat exchanger 2 is equipped with a heat exchange level gauge 21 for monitoring the tube side of the heat exchanger 2. The heat exchange level gauge 21 is electrically connected to the drain valve 20, and the drain valve 20 is adjusted by controlling the tube side liquid level in the heat exchanger 2. The heat exchanger 2 is equipped with a pressure sensor 22 for monitoring the shell side pressure of the heat exchanger 2. The pipe connecting the outlet of the heat exchanger 2 to the inlet of the vacuum pump 3 is connected to a pressure regulating pipe 23, which is connected to the atmosphere. A pressure regulating valve 24 is installed on the pressure regulating pipe 23, and the pressure sensor 22 is electrically connected to the pressure regulating valve 24, which is adjusted by controlling the shell side pressure of the heat exchanger 2.

[0027] In operation, the live steam valve 8 is activated, and the live steam provided by the steam source 7 enters the jet heat pump 6 through the live steam pipeline. Under the action of the jet heat pump 6, the live steam enters the vacuum disc scraper dryer 1. The wet material provided by the wet material source 19 enters the plate preheater 18 along the pipeline. Since the system is initially started at this time, there is no secondary condensate entering the plate preheater 18 to preheat the wet material. Therefore, the wet material enters the vacuum disc scraper dryer 1 directly without preheating. The live steam in the vacuum disc scraper dryer 1 heats the wet material, the wet material temperature rises, the moisture in the wet material evaporates into secondary steam, the live steam cools down and condenses into condensate, and the wet material is dried.

[0028] Under the action of vacuum pump 3, the secondary steam generated during the drying process of vacuum disc scraper dryer 1 flows out from the secondary steam outlet of vacuum disc scraper dryer 1 and enters the shell side of heat exchanger 2. The condensate formed by the cooling of the generated steam in vacuum disc scraper dryer 1 enters the condensate storage tank 9, and then enters the tube side of heat exchanger 2 under the action of condensate pump 10. Under the action of circulation pump 4, the condensate circulates in the tube side of heat exchanger 2. In heat exchanger 2, the high-temperature secondary steam in the shell side exchanges heat with the condensate in the tube side, and the high-temperature secondary steam heats the condensate. The condensate evaporates into saturated steam. After the saturated steam is separated from the water by separator 5, it enters the first steam compressor 25 through a pipeline. The first steam compressor 25 performs the first mechanical compression on the saturated steam, increasing its pressure and temperature for the first time. Then, the saturated steam enters the second steam compressor 26, which performs the second mechanical compression on the saturated steam, increasing its pressure and temperature for the second time. The saturated steam after the two pressurization and heating processes enters the vacuum disc scraper dryer 1 to dry the wet material inside. The secondary steam in the shell side of heat exchanger 2 is cooled and condensed into secondary condensate. The secondary condensate enters the secondary condensate tank 13, and then, under the action of the secondary condensate pump, enters the plate preheater 18 as a preheating medium to preheat the wet material.

[0029] As the system operates, the vacuum disc scraper dryer 1 generates more and more secondary steam, and the heat exchanger 2 produces more and more saturated steam. Once the system is running stably, the drying requirements of the vacuum disc scraper dryer 1 can be met using only saturated steam. At this point, the steam valve can be closed, and the live steam from the steam source 7 can be used as supplementary steam, which can effectively reduce the amount of live steam used and reduce costs.

[0030] In this embodiment, the outlet of the condensate tank is connected to the inlet of the jet heat pump 6 through a pipeline. The condensate produced by the vacuum disc scraper dryer 1 has a certain temperature, and steam will inevitably be generated in the condensate tank. After being sprayed by the jet heat pump 6, the steam re-enters the vacuum disc scraper dryer 1 to dry the wet material and recover the steam in the condensate.

[0031] In this embodiment, the condensate tank has a condensate level gauge 12 for monitoring the liquid level. The condensate level gauge 12 controls the adjustment of the condensate valve 11. When the liquid level in the condensate tank is low, the opening of the condensate valve 11 can be appropriately reduced. When the liquid level in the condensate tank is high, the opening of the condensate valve 11 can be increased.

[0032] In this embodiment, the heat exchanger 2 is equipped with a heat exchange level gauge 21 for monitoring the tube side of the heat exchanger 2, and a drain valve 20 is installed on the drain pipe. The heat exchange level gauge 21 is electrically connected to the drain valve 20. The drain valve 20 is adjusted by controlling the liquid level in the tube side of the heat exchanger 2. When the liquid level in the tube side of the heat exchanger 2 is too high, the drain valve 20 can be opened to send condensate into the plate heat exchanger 2 as a heat exchange medium to preheat the wet material. Excess condensate in the tube side of the heat exchanger 2 is drained through the drain pipe to maintain system stability.

[0033] In this embodiment, a drain valve 17 is provided on the drain pipe 16, and a secondary condensate level gauge 15 is provided on the secondary condensate tank 13 to monitor the liquid level in the secondary condensate tank 13. The drain valve 17 is adjusted by controlling the liquid level in the secondary condensate tank 13. When the secondary condensate level in the secondary condensate tank 13 is high, the opening of the drain valve 17 can be increased. When the liquid level in the secondary condensate tank 13 is low, the opening of the drain valve 17 can be appropriately decreased.

[0034] In this embodiment, the heat exchanger 2 is equipped with a pressure sensor 22 for monitoring the shell-side pressure, and a pressure regulating valve 24 is provided on the pressure regulating pipeline 23. The pressure regulating valve 24 is adjusted by controlling the shell-side pressure of the heat exchanger 2, so that outside air enters the shell side of the heat exchanger 2 through the pressure regulating pipeline 23, or the non-condensable gas in the shell side is discharged to the atmosphere from the pressure regulating pipeline 23, thereby maintaining the shell-side pressure of the heat exchanger 2 stable, that is, maintaining the system pressure stable.

[0035] It should be noted that the above-described embodiments are illustrative of the technical solution of this utility model and not limiting. Equivalent substitutions or other modifications made by those skilled in the art based on the prior art, as long as they do not exceed the concept and scope of the technical solution of this utility model, should be included within the scope of the claims of this utility model.

Claims

1. An MVR vacuum disc scraper drying system, characterized in that: include: A vacuum disc scraper dryer (1) is used for drying wet materials. The secondary steam outlet of the vacuum disc scraper dryer (1) is connected to the shell-side inlet of a heat exchanger (2) through a pipeline. The shell-side outlet of the heat exchanger (2) is connected to the inlet of a vacuum pump (3) through a pipeline. The outlet of the vacuum pump (3) is vented. The tube-side outlet of the heat exchanger (2) is connected to the inlet of the circulating pump (4), the outlet of the circulating pump (4) is connected to the tube-side inlet of the heat exchanger (2), the condensate outlet of the vacuum disc scraper dryer (1) is connected to the inlet of the circulating pump (4) through a pipeline, the air outlet of the heat exchanger (2) is connected to the inlet of the separator (5), the separated steam outlet of the separator (5) is connected to the air inlet of the steam compressor through a pipeline, the liquid outlet of the separator (5) is connected to the inlet of the circulating pump (4), and the air outlet of the steam compressor is connected to the air inlet of the vacuum disc scraper dryer (1).

2. The MVR vacuum disc scraper drying system according to claim 1, characterized in that: The air inlet of the vacuum disc scraper dryer (1) is connected to the air inlet pipeline, which is connected to the air outlet of the steam compressor and the air outlet of the jet heat pump (6). The air inlet of the jet heat pump (6) is connected to the steam source (7) through the live steam pipeline, and the live steam pipeline is equipped with a live steam valve (8).

3. The MVR vacuum disc scraper drying system according to claim 1, characterized in that: The condensate outlet of the vacuum disc scraper dryer (1) is connected to the inlet of the condensate storage tank (9) through a pipeline. The outlet of the condensate storage tank (9) is connected to the inlet of the condensate pump (10) through a pipeline. The outlet of the condensate pump (10) is connected to the inlet of the circulating pump (4) through a pipeline. The air outlet of the condensate storage tank (9) is connected to the air inlet of the jet heat pump (6) through a pipeline.

4. The MVR vacuum disc scraper drying system according to claim 3, characterized in that: A condensate valve (11) is installed on the pipeline connecting the outlet of the condensate pump (10) and the inlet of the circulation pump (4). A condensate level gauge (12) is installed on the condensate storage tank (9) to monitor the liquid level inside the condensate storage tank (9). The condensate level gauge (12) is electrically connected to the condensate valve (11), and the condensate valve (11) is adjusted by controlling the liquid level inside the condensate storage tank (9).

5. The MVR vacuum disc scraper drying system according to claim 1, characterized in that: The number of steam compressors is multiple, and the multiple steam compressors are connected in series.

6. The MVR vacuum disc scraper drying system according to claim 1, characterized in that: The heat exchanger (2) is equipped with a pressure sensor (22) for monitoring the shell-side pressure of the heat exchanger (2). The pipeline connecting the outlet of the heat exchanger (2) to the inlet of the vacuum pump (3) is connected to the pressure regulating pipeline (23). The pressure regulating pipeline (23) is connected to the atmosphere. The pressure regulating pipeline (23) is equipped with a pressure regulating valve (24). The pressure sensor (22) is electrically connected to the pressure regulating valve (24). The pressure regulating valve (24) is adjusted by controlling the shell-side pressure of the heat exchanger (2).

7. The MVR vacuum disc scraper drying system according to any one of claims 1 to 6, characterized in that: The heat exchanger (2) has a condensate outlet connected to the shell side of the heat exchanger (2), the condensate outlet is connected to the inlet of the secondary condensate tank (13) through a pipeline, the outlet of the secondary condensate tank (13) is connected to the inlet of the secondary condensate pump (14), the outlet of the secondary condensate pump (14) is connected to the drain pipeline (16), and the air outlet of the secondary condensate tank (13) is connected to the tube side of the heat exchanger (2).

8. The MVR vacuum disc scraper drying system according to claim 7, characterized in that: The secondary condensate tank (13) is equipped with a secondary condensate level gauge (15) for monitoring the liquid level inside the secondary condensate tank (13). The drain pipe (16) is equipped with a drain valve (17). The drain valve (17) is electrically connected to the secondary condensate level gauge (15). The drain valve (17) is adjusted by controlling the liquid level inside the secondary condensate tank (13).

9. The MVR vacuum disc scraper drying system according to any one of claims 1 to 6, characterized in that: The feed inlet of the vacuum disc scraper dryer (1) is connected to the discharge outlet of the plate preheater (18) through a pipeline. The feed inlet of the plate preheater (18) is connected to the wet material source (19). The preheating medium inlet of the plate preheater (18) is connected to the drainage pipeline (16). Wastewater is discharged from the preheating medium outlet of the plate preheater (18).

10. The MVR vacuum disc scraper drying system according to claim 9, characterized in that: The preheating medium inlet of the plate preheater (18) is connected to the outlet of the circulating pump (4) through a drain pipe. A drain valve (20) is provided on the drain pipe. A heat exchanger level gauge (21) for monitoring the tube side of the heat exchanger (2) is provided on the heat exchanger (2). The heat exchange level gauge (21) is electrically connected to the drain valve (20). The drain valve (20) is adjusted by controlling the tube side liquid level in the heat exchanger (2).

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