Spray drying system

Abstract

The utility model relates to the technical field of drying equipment, and provides a spray drying system which comprises a spray drying module used for drying feed liquid to obtain a target product and high-temperature waste gas; the heat pump module comprises a compressor and a heat exchanger which are connected in sequence; the compressor is used for introducing high-temperature waste gas, compressing the high-temperature waste gas to increase enthalpy and converting the high-temperature waste gas into high-temperature high-pressure gas; the heat exchanger is used for heat exchange between high-temperature and high-pressure gas and inlet gas of the spray drying module, and waste gas with heat released is obtained. According to the spray drying system and the spray drying method, the compressor compresses high-temperature waste gas to increase enthalpy, and the high-temperature waste gas is converted into high-temperature and high-pressure gas; the heat exchanger is used for heat exchange between high-temperature and high-pressure gas and inlet gas of the spray drying module, waste gas with heat released is obtained, the temperature of the inlet gas is increased, low-grade heat energy in the high-temperature waste gas is recycled, and the heat energy is used as a drying heat source after being pressurized and enthalpy-increased, so that the energy consumption of the drying system is reduced, and the carbon emission is also reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to drying equipment technical field especially relates to a spray drying system. BACKGROUND

[0002] Spray drying is through mechanical action, the material that needs to dry is dispersed into very fine like mist microgranule, after contacting with hot air, most of the water is removed, and the solid matter in the material is dried into powder.

[0003] In chemical industry, pharmacy, textile, papermaking, food, agricultural product processing and other industries, often need to remove the moisture in the material, in order to store, transport and further process, reach the production requirement specified. Spray drying can directly make solution, emulsion dry into powder or granular product, can save evaporation, crushing and other processes.

[0004] However, in the prior art, as shown in the figure, most of the spray drying system is that high-temperature waste gas is directly discharged into the atmosphere, and the system energy consumption is large, and the thermal efficiency is low. Figure 1 Practical new type content The utility model provides a spray drying system to solve the energy consumption of the prior art spray drying system, the thermal efficiency is low, realizes the low grade heat energy in the high-temperature waste gas, and recovers the condensed water after pressurizing and increasing the enthalpy as drying heat source.

[0005] The utility model provides a spray drying system, comprising:

[0006] Spray drying module, for drying liquid, obtains target product and high-temperature waste gas;

[0007] Spray drying module, for drying liquid, obtains target product and high-temperature waste gas;

[0008] Heat pump module, including the compressor and heat exchanger connected in sequence;The compressor is used for the high-temperature waste gas import, and the high-temperature waste gas is compressed and increased in enthalpy, and is converted into high-temperature high-pressure gas;The heat exchanger is used for the high-temperature high-pressure gas and the intake of the spray drying module heat exchange, obtains the waste gas after releasing heat.

[0009] According to the spray drying system provided by the utility model, the heat pump module further includes a condensate tank, the waste gas after releasing heat is discharged into the atmosphere after passing through the condensate tank, and the condensate tank is used to store the condensate generated by the waste gas after releasing heat.

[0010] According to the spray drying system provided by the utility model, the spray drying module comprises:

[0011] Liquid tank, for storing the dilute liquid material to be dried;

[0012] Driving device, connected with the liquid tank, the driving device is used for conveying the material.

[0013] A centrifugal atomizer is arranged downstream of the driving device, and the centrifugal atomizer is used to convert the thin liquid material into atomized liquid drop material.

[0014] A gas supply module is used to supply intake air, and the intake air of the gas supply module exchanges heat with the high-temperature and high-pressure gas in the heat exchanger.

[0015] A drying chamber is arranged downstream of the centrifugal atomizer, and the drying chamber provides a place for the hot air to contact the atomized liquid drop material.

[0016] A cyclone separator is used to realize gas-solid separation, the target product is precipitated in the cyclone separator, and the high-temperature waste gas is output at the top of the cyclone separator.

[0017] According to the spray drying system provided by the utility model, the spray drying module further comprises a bag filter, the bag filter is arranged downstream of the cyclone separator, and the bag filter is used to filter dust particles in the gas.

[0018] According to the spray drying system provided by the utility model, the spray drying module further comprises an exhaust fan, the exhaust fan is arranged downstream of the bag filter, and the exhaust fan is used to input the high-temperature waste gas into the compressor.

[0019] According to the spray drying system provided by the utility model, the gas supply module comprises:

[0020] A primary filter is used to preliminarily filter the air entering the system.

[0021] An air inlet fan is arranged downstream of the primary filter, and the air outlet of the air inlet fan enters the heat exchanger.

[0022] According to the spray drying system provided by the utility model, the gas supply module further comprises:

[0023] An electric heater is arranged on an air inlet pipeline and located downstream of the heat exchanger.

[0024] A secondary filter is arranged downstream of the electric heater, and the outlet of the secondary filter is connected with the drying chamber.

[0025] According to the spray drying system provided by the utility model, the driving device is a peristaltic pump.

[0026] According to the spray drying system provided by the utility model, the heat exchanger is a plate heat exchanger.

[0027] The spray drying system provided by the utility model dries the liquid material through the spray drying module, obtains the target product and high-temperature waste gas; the heat pump module comprises a compressor and a heat exchanger which are connected in sequence, the high-temperature waste gas is introduced into the compressor, the compressor compresses and increases the enthalpy of the high-temperature waste gas, and the high-temperature waste gas is converted into high-temperature and high-pressure gas; the heat exchanger supplies the high-temperature and high-pressure gas to exchange heat with the air inlet of the spray drying module, obtains the waste gas after releasing heat, and increases the temperature of the air inlet, the low-grade heat energy in the high-temperature waste gas is recycled, the heat energy is used as a drying heat source after being pressurized and increased in enthalpy, the waste heat resource is reduced, and the purpose of reducing the energy consumption and carbon emission of the drying system is achieved.

[0028] In addition, since the waste gas after releasing heat will condense to form condensed water, the condensed water is stored through the condensed water tank. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0030] Figure 1 It is the spray drying system in the prior art.

[0031] Figure 2 It is the spray drying system provided by the utility model.

[0032] REFERENCE NUMERALS

[0033] 1, spray drying module; 2, heat pump module; 21, compressor; 22, heat exchanger; 23, condensed water tank; 11, liquid material tank; 12, driving device; 13, centrifugal atomizer; 14, air supply module; 141, primary filter; 142, air inlet fan; 143, electric heater; 144, secondary filter; 15, drying chamber; 16, cyclone separator; 17, bag filter; 18, air outlet fan. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will combine the drawings in the utility model, and clearly and completely describe the technical scheme in the utility model, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by those skilled in the art without creating creative labor belong to the protection scope of the utility model.

[0035] In the description of the embodiments of the utility model, it needs to be explained that, the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0036] The following will be described in combination with Figure 2 The spray drying system of the utility model, including spray drying module 1 and heat pump module 2.

[0037] Among them, spray drying module 1 is used to dry the liquid, and the target product is obtained while high-temperature waste gas is produced. In order to reduce carbon emissions, heat pump module 2 is set. Heat pump module 2 includes compressor 21 and heat exchanger 22 connected in sequence; compressor 21 is used for high-temperature waste gas to pass in, and the high-temperature waste gas is compressed and increased in enthalpy, and is converted into high-temperature and high-pressure gas; heat exchanger 22 is used for high-temperature and high-pressure gas and the inlet gas of spray drying module 1 to exchange heat, not only the waste gas after releasing heat is obtained, the carbon emissions are reduced, but also the inlet gas temperature of spray drying module 1 is increased, the energy utilization rate is improved, and the waste of heat resources and carbon emissions is reduced.

[0038] In a feasible embodiment of the utility model, since the waste gas after releasing heat will produce condensate, heat pump module 2 further includes condensate tank 23, condensate tank 23 is arranged at the downstream of heat exchanger 22, the waste gas after releasing heat is discharged into the atmosphere after passing through condensate tank 23, and condensate tank 23 is used to store the condensate generated by the waste gas after releasing heat.

[0039] In a feasible embodiment of the utility model, spray drying module 1 includes liquid tank 11, driving device 12, centrifugal atomizer 13, gas supply module 14, drying chamber 15 and cyclone 16. Liquid tank 11 is used to store the dilute liquid material to be dried;Driving device 12 is connected with liquid tank 11, and driving device 12 is used to transport dilute liquid material;Centrifugal atomizer 13 is arranged downstream of driving device 12, and centrifugal atomizer 13 is used to convert dilute liquid material into atomized liquid drop state;Gas supply module 14 is used to provide intake air, which is usually high-temperature hot gas, to enable the drying of liquid in dilute liquid material. And the intake air of gas supply module 14 exchanges heat with high-temperature high-pressure gas in the heat exchanger;Drying chamber 15 is arranged downstream of centrifugal atomizer 13, and drying chamber 15 provides a place for hot air to contact with atomized liquid drop material;Cyclone 16 realizes gas-solid separation, and the target product is precipitated in cyclone 16, and high-temperature waste gas is output from the top of cyclone 16.

[0040] Wherein, in the rotating process, solid particles or liquid drops with large inertia centrifugal force are thrown to the outer wall surface, and under the action of gravity, they fall along the cylinder wall to the liquid storage area at the bottom of the equipment, and clean gas is discharged from the top discharge port.

[0041] In a feasible embodiment of the utility model, spray drying module 1 further includes bag filter 17, which is arranged downstream of cyclone 16, and bag filter 17 is used to filter dust particles in gas to ensure the cleanliness of the outgoing high-temperature gas.

[0042] In a feasible embodiment of the utility model, spray drying module 1 further includes exhaust fan 18, which is arranged downstream of bag filter 17, and exhaust fan 18 is used to input high-temperature waste gas into compressor 21. The exhaust fan rotates the fan blade driven by the motor, promoting the exhaust of the outlet gas of bag filter 17.

[0043] In a feasible embodiment of the utility model, gas supply module 14 includes primary filter 141 and intake fan 142. Primary filter 141 usually has large-crease filtering area to ensure the amount of fresh air while effectively filtering large particles, dust, mosquitoes, hair, etc. in the air entering from the outside to the inside, and is located at the initial part of gas supply module 14, which is the first barrier for the air entering the system. Intake fan 142 is arranged downstream of primary filter 141, and intake fan 142 sucks the air purified by primary filter 141 and transports it to heat exchanger 22, i.e. the air at the outlet of intake fan 142 enters heat exchanger 22. In heat exchanger 22, the temperature of the air can be increased within a certain range, thereby reducing the energy consumption of gas supply module 14.

[0044] In a feasible embodiment of the utility model, air supply module 14 still includes electric heater 143 and secondary filter 144, electric heater 143 is arranged on the air inlet pipeline and is located downstream of heat exchanger 22, can further heat air through electric heater 143, ensure that air reaches the required temperature range.Secondary filter 144 is arranged downstream of electric heater 143, can intercept, adsorb and filter particulate matter in air under high temperature conditions using filter material, provide higher level of air purification, remove tiny particles in air, the outlet of secondary filter 144 is connected with drying chamber 15, and the air after secondary filtration depth purification enters drying chamber 15.

[0045] It needs to be explained that, in actual application process, if the heat provided by heat pump module 2 has made the air input by fan reach the dryness requirement temperature, then electric heater 143 can be powered off.

[0046] That is, air supply module 14 is a comprehensive system including multi-stage filtration, temperature regulation and air purification functions, and the purpose is to provide clean and temperature required air for drying chamber 15.

[0047] In a feasible embodiment of the utility model, drive device 12 is a peristaltic pump, the peristaltic pump can extrude and release the hose through the roller, thereby realizing the accurate control of fluid, so that the peristaltic pump can maintain stable flow and pressure when conveying gas or liquid.The peristaltic pump can handle high viscosity, corrosive or particle-containing fluids.

[0048] Further, heat exchanger 22 is a plate heat exchanger, which has a high heat exchange coefficient, a compact structure, a small volume and a large heat transfer area per unit volume.

[0049] In summary, the spray drying system provided by the utility model, the peristaltic pump pumps the material in the liquid tank 11 into the centrifugal atomizer 13, the centrifugal atomizer 13 converts the dilute liquid material into atomized droplets, which are sprayed into the drying chamber 15 through the nozzle. At the same time, the air inlet fan 142 inputs air from the atmosphere into the primary filter 141 for large particle filtration, and then into the heat exchanger 22 to absorb heat. The heated air is heated in the electric heater 143 until the required temperature for drying is met, and then passes through the secondary filter 144 for secondary filtration of particulate matter, and finally enters the drying chamber 15 to contact the material for drying.

[0050] The high-temperature waste gas after the drying process first enters the cyclone separator 16 for solid-liquid-gas separation, and then enters the bag filter 17 for further filtration of tiny particulate matter. Finally, the clean high-temperature waste gas is input into the compressor 21 by the exhaust fan 18 for compression and enthalpy increase.

[0051] The compressor 21 compresses the input high-temperature waste gas to increase the enthalpy, converts it into high-temperature and high-pressure gas, and inputs it into the plate heat exchanger 22 to exchange heat with the input air of the air input fan 142.

[0052] The heat pump module composed of the compressor, the heat exchanger and the condensate tank is used for waste heat recovery modification on the original spray drying system, so that the waste of waste heat resources is reduced, and the energy consumption and carbon emission of the drying system are reduced.

[0053] In the description of the embodiments of the present application, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0054] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "way", "specific way" or "some ways" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or way are included in at least one embodiment or way of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or way. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or ways in a suitable way. In addition, the skilled in the art can combine and combine the different embodiments or characteristics of the different embodiments or ways described in the present application without contradiction.

[0055] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A spray drying system characterized by, The application relates to a spray drying system. The spray drying system comprises a spray drying module (1) for drying liquid material to obtain target product and high-temperature exhaust gas; and a heat pump module (2) comprising a compressor (21) and a heat exchanger (22) connected in sequence; the compressor (21) is used for allowing the high-temperature exhaust gas to pass in and compressing the high-temperature exhaust gas to increase enthalpy, so that the high-temperature exhaust gas is converted into high-temperature and high-pressure gas; the heat exchanger (22) is used for allowing the high-temperature and high-pressure gas to exchange heat with the air inlet of the spray drying module (1), so that the exhaust gas after releasing heat is obtained. The heat pump module (2) further comprises a condensate tank (23), the exhaust gas after releasing heat is discharged into the atmosphere after passing through the condensate tank (23), and the condensate tank (23) is used for storing condensate generated by the exhaust gas after releasing heat.

2. The spray drying system of claim 1, wherein, The spray drying module (1) comprises a liquid tank (11) for storing dilute liquid material to be dried; a driving device (12) connected with the liquid tank (11), the driving device (12) is used for conveying the material; a centrifugal atomizer (13) arranged downstream of the driving device (12), the centrifugal atomizer (13) is used for converting the dilute liquid material into atomized liquid drop material; an air supply module (14) for providing air inlet; and the air inlet of the air supply module (14) exchanges heat with the high-temperature and high-pressure gas in the heat exchanger (22); a drying chamber (15) arranged downstream of the centrifugal atomizer (13), the drying chamber (15) provides a place for the hot air to contact with the atomized liquid drop material; and a cyclone separator (16) for realizing gas-solid separation, the target product is precipitated in the cyclone separator (16), and the high-temperature exhaust gas is output from the top of the cyclone separator (16).

3. The spray drying system of claim 1, wherein, The spray drying module (1) further comprises a bag filter (17) arranged downstream of the cyclone separator (16), the bag filter (17) is used for filtering dust particles in the gas. The spray drying module (1) further comprises an exhaust fan (18) arranged downstream of the bag filter (17), the exhaust fan (18) is used for inputting the high-temperature exhaust gas into the compressor (21). The air supply module (14) comprises a primary filter (141) for preliminarily filtering the air entering the system; and an air inlet fan (142) arranged downstream of the primary filter (141), and the air outlet of the air inlet fan (142) enters the heat exchanger (22). The air supply module (14) further comprises an electric heater (143) arranged on an air inlet pipeline and located downstream of the heat exchanger (22); and a secondary filter (144) arranged downstream of the electric heater (143), and the outlet of the secondary filter (144) is connected with the drying chamber (15). The driving device (12) is a peristaltic pump. The heat exchanger (22) is a plate heat exchanger. ​ 4. The spray drying system of claim 3, wherein, ​ 5. The spray drying system of claim 4, wherein, ​ 6. The spray drying system of claim 3, wherein, ​ ​ ​ 7. The spray drying system of claim 6, wherein, ​ ​ ​ 8. The spray drying system of claim 3, wherein, ​ 9. The spray drying system of claim 1, wherein, ​

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