Vacuum sludge drying system with spray cooling function
The vacuum sludge drying system, which combines a vacuum pump with spray cooling, solves the limitations of cold source temperature and heat exchange terminal difference, achieving low-pressure and low-temperature vacuum drying, improving drying efficiency, reducing equipment costs, and being environmentally friendly.
Patent Information
- Application Number
- CN202520217528.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-02-12
AI Technical Summary
Existing vacuum sludge drying technologies are limited by cold source temperature and heat exchange end differences, making it difficult to further reduce vacuum pressure and temperature, thus limiting drying efficiency and equipment costs.
The vacuum pump and spray cooling method is adopted, combined with a spray heat exchanger and a stirring mechanism, to achieve low-pressure and low-temperature vacuum drying. The vacuum pump is used to draw a vacuum and spray cooling is used to reduce the operating pressure and temperature of the equipment, thereby increasing the temperature difference between the heat source and the flash evaporation.
It significantly improves drying efficiency, reduces equipment costs and energy consumption, lowers the demand for equipment manufacturing materials, reduces waste heat emissions, and has a small environmental impact.
Smart Images
Figure CN223688224U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to sludge drying technical field, especially is involved in a kind of vacuum sludge drying system of spray cooling. BACKGROUND
[0002] The existing vacuum sludge drying at present stage generally uses partition wall type condenser as cold source to maintain vacuum.But due to the limitation of cold source temperature and the existence of heat exchange end difference, vacuum pressure is maintained at 7.3kPa.a has reached the limit.For example, under the condition that cooling water temperature is 25 ℃, the flash evaporation temperature in vacuum chamber is at least above 40 ℃.
[0003] The utility model uses vacuum pump+spray cooling mode to maintain vacuum, and the process of spray heat exchange can basically guarantee that the operating pressure of vacuum drying equipment is as low as 1.7-3.2kPa.a, and the temperature is as low as 15-25 ℃, greatly increase the temperature difference of heat source and flash evaporation, reduce equipment heat exchange area, reduce cost and increase efficiency. SUMMARY
[0004] To solve the above technical problems, the utility model adopts the technical scheme of a kind of vacuum sludge drying system of spray cooling, comprising: vacuum drying box, the vacuum drying box is connected with dust collector by first steam channel, the dust collector is connected with the gas medium inlet of spray heat exchanger by second steam channel, and vacuum pump is provided on the spray heat exchanger for vacuumizing vacuum drying box.
[0005] Further, the vacuum drying box includes: shell, the shell is provided with drying chamber and heating chamber, the heating chamber is wrapped in drying chamber, and the drying chamber is connected with the gas medium inlet of spray heat exchanger by second steam channel.
[0006] Further, the shell is provided with at least one to be dried medium inlet and at least one to be dried medium outlet, and the to be dried medium inlet and the to be dried medium outlet are communicated with drying chamber.
[0007] Further, the shell is provided with at least one heat source medium inlet and at least one heat source medium outlet, and the heat source medium inlet and the heat source medium outlet are communicated with heating chamber.
[0008] Further, the shell is provided with heat preservation layer for heat preservation of heating medium in the heating chamber.
[0009] Further, the heating medium is liquid medium or gaseous medium.
[0010] Further, the vacuum drying box is provided with stirring mechanism for stirring to be dried medium.
[0011] Further, the stirring mechanism comprises a motor, which is arranged outside the vacuum drying box, and the output end of the motor is connected with the stirring blade arranged in the vacuum drying box.
[0012] Further, the stirring mechanism comprises a motor, which is arranged inside the vacuum drying box, and the output end of the motor is connected with the stirring blade arranged in the vacuum drying box.
[0013] The present application has the following advantages:
[0014] 1. Improved drying efficiency
[0015] The system uses a vacuum pump + spray cooling method to maintain vacuum. Compared with the traditional partition type condenser, it can significantly reduce the operating pressure of the equipment to 1.7-3.2 kPa.a, while the temperature is controlled within 15-25℃. This improvement greatly increases the temperature difference between the heat source and the flash evaporation, thereby improving the drying efficiency.
[0016] 2. Reduced equipment cost
[0017] Because of the lower working pressure and higher heat exchange efficiency, the required heat exchange area of the equipment is reduced, the demand for manufacturing materials is reduced, and the overall cost of the equipment is reduced.
[0018] 3. Environmentally friendly
[0019] The efficient drying process means consuming less energy to complete the same amount of work, which helps to reduce energy consumption and greenhouse gas emissions. In addition, there is almost no waste heat emission in the spray heat exchange process, which has less impact on the environment. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 is a structural schematic diagram of the present application.
[0021] The drawings show that the vacuum drying box 1, the shell 11, the drying chamber 12, the heating chamber 13, the medium to be dried inlet 14, the medium to be dried outlet 15, the heat source medium inlet 16, the heat source medium outlet 17, the first steam channel 2, the dust collector 3, the second steam channel 4, the spray heat exchanger 5, the vacuum pump 6, the stirring mechanism 7, the motor 71, and the stirring blade 72. DETAILED DESCRIPTION
[0022] In the description of the utility model, it is necessary to understand that the orientation or positional relation indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.
[0023] In the description of the utility model, it should be explained that, unless otherwise expressly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.
[0024] The utility model is further described below in combination with the embodiments and drawings: a kind of vacuum sludge drying system of spray cooling, comprising: vacuum drying box 1, the vacuum drying box 1 is connected with dust collector 3 by first steam channel 2, the dust collector 3 is connected with the gas medium inlet of spray heat exchanger 5 by second steam channel 4, and vacuum pump 6 for vacuumizing vacuum drying box 1 is provided on the spray heat exchanger 5.The vacuum drying box 1 includes: shell 11, drying chamber 12 and heating chamber 13 are provided on the shell 11, the heating chamber 13 is wrapped in drying chamber 12, and the drying chamber 12 is connected with the gas medium inlet of spray heat exchanger 5 by second steam channel 4.At least one to be dried medium inlet 14 and at least one to be dried medium outlet 15 are provided on the shell 11, and the to be dried medium inlet 14 and to be dried medium outlet 15 are connected with drying chamber 12.At least one heat source medium inlet 16 and at least one heat source medium outlet 17 are provided on the shell 11, and the heat source medium inlet 16 and heat source medium outlet 17 are connected with heating chamber 13.Heat-insulating layer for heat-insulating heating medium in the heating chamber 13 is provided outside the shell 11.The heating medium is liquid medium or gaseous medium.Vacuum drying box 1 is provided with stirring mechanism 7 for stirring to be dried medium.The stirring mechanism 7 includes: motor 71, the motor 71 is arranged outside vacuum drying box 1, and the motor 71 output end is connected with stirring blade 72 arranged in the vacuum drying box 1.The stirring mechanism 7 includes: motor 71, the motor 71 is arranged inside vacuum drying box 1, and the motor 71 output end is connected with stirring blade 72 arranged in the vacuum drying box 1, first steam channel 2 and second steam channel 4 can be pipeline or opening, according to actual product structure.
[0025] The vacuum drying chamber 1 can be made of stainless steel (such as 304L or 316L) or carbon steel, depending on the specific operating conditions and budget. Stainless steel provides excellent corrosion resistance, while carbon steel is more cost-effective and suitable for non-corrosive environments. To enhance the corrosion resistance of carbon steel, a corrosion-resistant coating is usually applied to its surface. The shell 11 is designed in a cylindrical or rectangular shape, which not only helps to evenly distribute internal pressure but also reduces stress concentration points, improving the safety of the container. This design also helps to simplify the manufacturing process and reduce costs. The first and second exhaust channels 2 and 4 can be made of stainless steel or corrosion-treated carbon steel to ensure reliability and durability during long-term operation. The design of the pipeline should consider fluid mechanics characteristics to ensure smooth flow of exhaust steam and reduce energy loss. In terms of shape, it is usually in the form of straight pipes or bends, depending on the installation space and layout requirements. The use of high-quality stainless steel or appropriately treated carbon steel not only prolongs the service life but also reduces maintenance costs and ensures stable operation of the system. The dust collector 3 can be a cyclone dust collector, which uses centrifugal force to separate particles in the air. When dust-containing gas enters the dust collector, it is subjected to high-speed rotation, causing heavier particles to be thrown against the wall and fall to the bottom for discharge, while the purified gas is discharged from the top. Alternatively, a bag filter (sack filter) can be used, which captures dust particles through a filter medium such as fabric or fiber bags. It has high dust removal efficiency and can handle fine dust particles, making it suitable for various types of dust collection. The spray heat exchanger 5, also known as a spray tower, is an economical and practical choice for non-corrosive conditions, as carbon steel with appropriate protective coating can achieve direct heat exchange between cooling water and exhaust steam with a temperature difference of ±1°C, resulting in high heat exchange efficiency. The stirring mechanism 7 includes a motor 71 and stirring blades 72, which can be made of reinforced nylon, polyurethane rubber, or other suitable composite materials. These materials are both wear-resistant and corrosion-resistant, effectively promoting uniform heating of the sludge and preventing clumping, thereby improving drying efficiency. In addition, reasonable stirring design can also accelerate water evaporation speed and shorten drying period. For support structures or non-contact components, carbon steel can also be used with appropriate corrosion treatment if cost is a consideration.
[0026] Working process
[0027] Sludge introduction and pretreatment
[0028] Wet sludge is introduced into the vacuum drying chamber 1 through the medium inlet 14, and the drying chamber 12 is in a closed state to ensure the formation of a vacuum environment. In some cases, preliminary screening or crushing of the incoming sludge may be required to facilitate subsequent drying.
[0029] Drying process
[0030] The sludge is fed into the vacuum drying chamber 1 and the drying process begins. The heat source medium (which can be liquid or gaseous) in the heating chamber 13 provides heat to the sludge in the drying chamber 12 through heat conduction. Due to the presence of the vacuum environment, the water in the sludge can evaporate into water vapor at a lower temperature, i.e. flash evaporation. To promote drying efficiency, the stirring mechanism 7 will be periodically activated to ensure uniform heating of the sludge and prevent it from clumping.
[0031] Steam treatment
[0032] The flash steam first passes through the dust collector 3 to remove the fine particulate matter entrained therein, and then enters the spray heat exchanger 5 through the second steam passage 4. Here, the steam is in direct contact with the cooling water flowing from the upper part, achieving efficient heat exchange. The cooling water, after absorbing the heat of the steam, is heated and discharged through the drain, while most of the steam is condensed into water, and the uncondensed part and non-condensable gas are extracted by the vacuum pump 6 to maintain the vacuum degree of the entire system.
[0033] Dried sludge output
[0034] When the sludge reaches the predetermined drying degree, the dried sludge is removed from the vacuum drying chamber 1 by opening the dried medium outlet 15. This process may require further processing, such as crushing, packaging, etc., depending on the final use or storage conditions of the sludge.
[0035] The above describes the embodiments of the present application in detail, but the content described is only the preferred embodiments of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still be within the scope of the present application.
Claims
1. A spray-cooled vacuum sludge dewatering system, characterized by, The application relates to a vacuum drying box (1) which is communicated with a dust collector (3) through a first steam channel (2), the dust collector (3) is connected with a gas medium inlet of a spray heat exchanger (5) through a second steam channel (4), and a vacuum pump (6) for vacuumizing the vacuum drying box (1) is arranged on the spray heat exchanger (5). The vacuum drying box (1) comprises a shell (11) which is provided with a drying chamber (12) and a heating chamber (13), the heating chamber (13) is wrapped on the drying chamber (12), and the drying chamber (12) is connected with the gas medium inlet of the spray heat exchanger (5) through the second steam channel (4).
2. The spray-cooled vacuum sludge dewatering system of claim 1, wherein, At least one to-be-dried medium inlet (14) and at least one to-be-dried medium outlet (15) are arranged on the shell (11) and communicated with the drying chamber (12).
3. The spray-cooled vacuum sludge dewatering system of claim 2, wherein, At least one heat source medium inlet (16) and at least one heat source medium outlet (17) are arranged on the shell (11) and communicated with the heating chamber (13).
4. The spray-cooled vacuum sludge dewatering system of claim 2, wherein, An insulation layer for heat preservation of the heating medium in the heating chamber (13) is arranged outside the shell (11).
5. The spray-cooled vacuum sludge dewatering system of claim 2, wherein, The heating medium is a liquid medium or a gaseous medium.
6. The spray-cooled vacuum sludge dewatering system of claim 5, wherein, A stirring mechanism (7) for stirring the to-be-dried medium is arranged in the vacuum drying box (1).
7. The spray-cooled vacuum sludge dewatering system of claim 1, wherein, The stirring mechanism (7) comprises a motor (71) which is arranged outside the vacuum drying box (1) and connected with stirring blades (72) arranged in the vacuum drying box (1).
8. The spray-cooled vacuum sludge dewatering system of claim 7, wherein, The stirring mechanism (7) comprises a motor (71) which is arranged inside the vacuum drying box (1) and connected with stirring blades (72) arranged in the vacuum drying box (1).
9. The spray-cooled vacuum sludge dewatering system of claim 7, wherein,