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 unit and a heat pump unit, the spray drying unit at least comprises a drying device, a feeding pipeline, a gas supply pipeline and an exhaust pipeline, the gas supply pipeline supplies heat source gas to the drying device, and the exhaust pipeline is used for exhausting gas in the drying device; the heat pump unit at least comprises a compressor, an evaporator and a condenser, the evaporator is used for heat exchange between a heat exchange medium and gas in the exhaust pipeline, and the condenser is used for heat exchange between the heat exchange medium and the gas supply pipeline. By means of the arrangement, heat of gas in the exhaust pipeline can be recycled through the heat exchange medium of the heat pump unit, and waste of heat resources is avoided; the compressor is used for compressing the heat exchange medium to increase enthalpy, the temperature of the heat exchange medium is effectively increased, heat is supplied to the gas in the gas supply pipeline through heat exchange between the heat exchange medium of the heat pump unit and the gas in the gas supply pipeline, the temperature of the gas in the gas supply pipeline is effectively increased, use of a heater is reduced, and energy consumption is 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 technology is a kind of liquid or slurry material is dispersed into small droplets by atomizer, and with hot air contact, utilize the heat energy of hot air to make the moisture in liquid or slurry material rapidly evaporate, to obtain dry powder or granular product technology.The current spray drying process is mainly completed in drying tower, and hot air inlet and atomizer are arranged on the drying tower, liquid or slurry material enters the drying tower by atomizer, and hot air enters the drying tower by hot air inlet.With the progress of spray drying process, dry powder or granule is deposited at the bottom of drying tower, and high-temperature gas in drying tower is gradually discharged.

[0003] In the related art, the evaporation capacity in the drying tower is large, and the demand for hot air is large, and the hot air supplied to the drying tower is mainly obtained by heating air by an electric heater, and the electric heater consumes high energy.In addition, the high-temperature gas in the drying tower is directly discharged to the atmosphere, resulting in a large amount of waste of heat resources.

[0004] Therefore, how to solve the problems of high energy consumption and waste of heat resources existing in the spray drying system in the related art has become an important technical problem to be solved by the technical personnel in the field. SUMMARY

[0005] The utility model provides a kind of spray drying system, to solve the defect of high energy consumption and waste of heat resources existing in the spray drying system in the related art.

[0006] The utility model provides a kind of spray drying system, comprising:

[0007] Spray drying unit at least includes drying device, feed pipe line, gas supply pipe line and exhaust pipe line, the feed pipe line is suitable for supplying to be dried material to the drying device, the gas supply pipe line is suitable for supplying heat source gas to the drying device, the exhaust pipe line is suitable for the gas in the drying device is discharged, the drying device has the discharge port of dry material discharge;

[0008] Heat pump unit at least includes compressor, evaporator and condenser, the evaporator is suitable for heat exchange between heat exchange medium and the gas in the exhaust pipe line, the condenser is suitable for heat exchange between heat exchange medium and the gas in the gas supply pipe line.

[0009] According to the spray drying system, the condenser has a first medium channel and a first gas channel, the evaporator has a second medium channel and a second gas channel, the first gas channel of the condenser is communicated with the gas supply pipeline, and the second gas channel of the evaporator is communicated with the exhaust pipeline.

[0010] The heat pump unit further comprises a liquid storage tank and a throttling valve, and the compressor, the first medium channel of the condenser, the throttling valve, the liquid storage tank and the second medium channel of the evaporator are sequentially connected to form a closed loop structure.

[0011] According to the spray drying system, the heat pump unit further comprises a first power pump, the first power pump is arranged between the liquid storage tank and the second medium channel of the evaporator, and the first power pump is suitable for providing power for flow of the heat exchange medium.

[0012] According to the spray drying system, the spray drying unit further comprises an air inlet fan and a heater, the air inlet fan and the heater are arranged in the gas supply pipeline, and the first gas channel of the condenser is connected with the air inlet fan and the heater at both ends.

[0013] According to the spray drying system, the spray drying unit further comprises at least one of a first filter and a second filter, the first filter and the second filter are arranged in the gas supply pipeline, the first filter is arranged at an inlet end of the air inlet fan, and the second filter is arranged at an outlet end of the heater.

[0014] According to the spray drying system, the spray drying unit further comprises a separator, the separator has a gas inlet, a gas outlet and a solid outlet, the gas inlet of the separator is connected with the drying device, the gas outlet of the separator is connected with the exhaust pipeline, and the solid outlet of the separator is used for discharging separated solids.

[0015] According to the spray drying system, the spray drying unit further comprises a third filter, the third filter is arranged in the exhaust pipeline, and the third filter is suitable for filtering gas in the exhaust pipeline.

[0016] According to the spray drying system, the spray drying system further comprises an exhaust fan, the exhaust fan is arranged in the exhaust pipeline, and the exhaust fan provides power for flow of gas in the exhaust pipeline.

[0017] The utility model provides a kind of spray drying system, the spray drying unit further include storage tank and second power pump, the storage tank and the second power pump are set to the feed line, the storage tank is suitable for storing liquid material, the second power pump is set between the storage tank and the drying device, the second power pump is suitable for pumping the material in the storage tank to the drying device.

[0018] The utility model provides a kind of spray drying system, the drying device includes drying chamber and atomizer, the atomizer is set to the inner top of the drying chamber, the atomizer is connected with the feed line, the atomizer is suitable for the material that enters the drying chamber is dispersed, atomizes.

[0019] The utility model provides a kind of spray drying system, including spray drying unit and heat pump unit, spray drying unit at least includes drying device, feed line, gas supply line and exhaust pipe, feed line is used to supply the drying device with to be dried material, gas supply line is used to supply the drying device with heat source gas, exhaust pipe is used for the gas in drying device to export, drying device has the discharge port of the dried material export. To be dried material and heat source gas are entered drying device after passing through feed line and gas supply line respectively, the moisture in to be dried material evaporates under the action of heat source gas, to obtain dried material, dried material can be exported by discharge port. The gas in drying device is exported by exhaust pipe. Heat pump unit at least includes compressor, evaporator and condenser, evaporator is used to supply heat exchange medium and the gas in exhaust pipe to exchange heat, condenser is used to supply heat exchange medium and the gas in gas supply line to exchange heat. Heat exchange medium is entered compressor after absorbing the heat of the gas in exhaust pipe in evaporator, after the compression of compressor, again enter condenser, release heat to the gas in gas supply line, and the gas in gas supply line absorbs heat and temperature rises. So set, the heat of the gas in exhaust pipe can be recycled using the heat exchange medium of heat pump unit, avoid the waste of heat resource;The compression of compressor to heat exchange medium is increased, effectively increase the temperature of heat exchange medium, again through the heat exchange of heat exchange medium of heat pump unit and the gas in gas supply line, heat for the gas in gas supply line, effectively improve the gas temperature in gas supply line, reduce the working burden of heater, reduce the use of heater, reduce energy consumption, solve the problem of high energy consumption, heat resource waste of spray drying system in the related art. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 It is the structural principle diagram of the spray drying system provided by the present application.

[0022] Reference signs:

[0023] 1, atomizer; 2, feed pipe; 3, gas supply pipe; 4, exhaust pipe; 5, discharge port; 6, compressor; 7, evaporator; 8, condenser; 9, liquid storage tank; 10, throttle valve; 11, first power pump; 12, air inlet fan; 13, heater; 14, first filter; 15, second filter; 16, separator; 17, solid outlet; 18, third filter; 19, exhaust fan; 20, storage tank; 21, second power pump; 22, drying chamber. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will combine the drawings in the present application to clearly and completely describe the technical scheme in the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0025] The following will combine Figure 1 to describe the spray drying system of the present application.

[0026] As Figure 1 shown, the spray drying system provided by the embodiments of the present application comprises a spray drying unit and a heat pump unit.

[0027] Specifically, the spray drying unit at least comprises a drying device, a feed pipe 2, a gas supply pipe 3 and an exhaust pipe 4. The feed pipe 2 is used to supply the material to be dried to the drying device, the gas supply pipe 3 is used to supply the heat source gas to the drying device, the exhaust pipe 4 is used to exhaust the gas in the drying device, and the drying device has a discharge port 5 for discharging the dried material. A material receiving device can be arranged below the discharge port 5 of the drying device to receive and collect the dried material discharged by the drying device.

[0028] The material receiving device can be a material receiving tank for collecting and storing the dried material discharged from the drying device, or a conveying belt device for receiving the dried material discharged from the drying device and conveying the received dried material to a target position.

[0029] After the material to be dried and the heat source gas enter the drying device through the material supply pipeline 2 and the gas supply pipeline 3 respectively, the moisture in the material to be dried evaporates under the action of the heat source gas, thereby obtaining the dried material, which can be discharged through the discharge port 5. The gas in the drying device is discharged through the exhaust pipeline 4.

[0030] The heat pump unit at least includes a compressor 6, an evaporator 7 and a condenser 8, the evaporator 7 is used for heat exchange between the heat exchange medium and the gas in the exhaust pipeline 4, and the condenser 8 is used for heat exchange between the heat exchange medium and the gas in the gas supply pipeline 3.

[0031] After the heat exchange medium absorbs the heat of the gas in the exhaust pipeline 4 in the evaporator 7, it enters the compressor 6, and after the compression and enthalpy increase of the compressor 6, it enters the condenser 8 again, releases heat to the gas in the gas supply pipeline 3, and the gas in the gas supply pipeline 3 absorbs heat and increases in temperature.

[0032] In this way, the heat of the gas in the exhaust pipeline 4 can be recovered by the heat exchange medium of the heat pump unit, avoiding waste of heat resources; the compression and enthalpy increase of the compressor 6 to the heat exchange medium effectively increases the temperature of the heat exchange medium, and then the heat exchange between the heat exchange medium of the heat pump unit and the gas in the gas supply pipeline 3 supplies heat to the gas in the gas supply pipeline 3, effectively increasing the temperature of the gas in the gas supply pipeline 3, reducing the working load of the heater 13, reducing the use of the heater 13, reducing energy consumption, increasing production, and solving the problems of high energy consumption and waste of heat resources in the related technology.

[0033] In the embodiment of the utility model, the condenser 8 has a first medium passage for the flow of heat exchange medium and a first gas passage for the flow of gas, and the heat exchange medium in the first medium passage can exchange heat with the gas in the first gas passage.

[0034] The evaporator 7 has a second medium passage for the flow of heat exchange medium and a second gas passage for the flow of gas, and the heat exchange medium in the second medium passage can exchange heat with the gas in the second gas passage.

[0035] The first gas passage of the condenser 8 is communicated with the air supply pipeline 3, and the second gas passage of the evaporator 7 is communicated with the air exhaust pipeline 4. The heat exchange medium is in liquid state when entering the second medium passage of the evaporator 7, and is evaporated to form gaseous state by absorbing the heat of the gas in the second gas passage of the evaporator 7. The gaseous heat exchange medium is compressed by the compressor 6 to form high-temperature and high-pressure gaseous heat exchange medium. The high-temperature and high-pressure gaseous heat exchange medium enters the first medium passage of the condenser 8 to form liquid heat exchange medium, and the heat released in the condensation process of the heat exchange medium can be transferred to the gas in the first gas passage of the condenser 8, so that the temperature of the gas in the first gas passage is increased.

[0036] In the embodiment, the heat pump unit further comprises a liquid storage tank 9 and a throttling valve 10, the compressor 6, the first medium passage of the condenser 8, the throttling valve 10, the liquid storage tank 9 and the second medium passage of the evaporator 7 are sequentially connected to form a closed loop structure, and the heat exchange medium circulates in the heat pump unit. After the heat exchange medium is formed into liquid heat exchange medium in the condenser 8, the liquid heat exchange medium enters the throttling valve 10, the throttling valve 10 can control the flow of the heat exchange medium, and the pressure of the heat exchange medium is reduced after passing through the throttling valve 10, so that the heat exchange medium enters the evaporator 7 at a lower pressure.

[0037] The liquid storage tank 9 has the function of storing the heat exchange medium, and is used for supplementing the heat exchange medium or storing the excess heat exchange medium. In addition, the liquid storage tank 9 also has the function of gas-liquid separation, and the heat exchange medium may be in gaseous state after passing through the throttling valve 10, so that the liquid storage tank 9 can only make the liquid heat exchange medium enter the evaporator 7, so as to improve the evaporation efficiency.

[0038] In the embodiment, the heat pump unit further comprises a first power pump 11, the first power pump 11 is arranged between the liquid storage tank 9 and the second medium passage of the evaporator 7, and the first power pump 11 is used for providing power for the circulation of the heat exchange medium, promoting the circulation of the heat exchange medium, and ensuring the efficient operation of the heat pump unit.

[0039] The first power pump 11 can be but is not limited to a low-temperature liquid pump.

[0040] In the embodiment of the utility model, the spray drying unit further comprises an air inlet fan 12 and a heater 13, the air inlet fan 12 and the heater 13 are arranged in the air supply pipeline 3, and the two ends of the first gas passage of the condenser 8 are connected with the air inlet fan 12 and the heater 13 respectively. The air inlet fan 12 can suck in air and provide power for the circulation of the air in the air supply pipeline 3. When the air sucked in by the air inlet fan 12 passes through the first gas passage of the condenser 8, the heat of the heat exchange medium in the first medium passage of the condenser 8 is absorbed, and then the air enters the heater 13. After the air passes through the heater 13, the air enters the drying device again.

[0041] The air sucked by the air inlet machine 12 absorbs the heat of the heat exchange medium in the condenser 8, and if the temperature of the air reaches the target temperature, the heater 13 does not need to heat the air, at which time the heater 13 can be closed to reduce the operating energy consumption of the heater 13. If the temperature of the air is lower than the target temperature, the heater 13 needs to be operated to further heat the air by the heater 13 so that the temperature of the air can reach the target temperature after passing through the heater 13.

[0042] The target temperature is the required gas temperature of the drying device during drying of the material, and the target temperature can be set to 140-150 DEG C.

[0043] The heater 13 can be, but is not limited to, an electric heater.

[0044] In the embodiment of the utility model, the working burden of the electric heater is reduced, the use of the electric heater is reduced, and the consumption of electric energy is reduced, so that the carbon emission can be reduced.

[0045] In the embodiment, the spray drying unit further comprises at least one of the first filter 14 and the second filter 15. The first filter 14 and the second filter 15 are arranged on the air supply pipeline 3 and are used for filtering the gas in the air supply pipeline 3.

[0046] The first filter 14 can be arranged on the air supply pipeline 3, the second filter 15 can be arranged on the air supply pipeline 3, or the first filter 14 and the second filter 15 can be arranged on the air supply pipeline 3.

[0047] Referring to Figure 1 The first filter 14 and the second filter 15 are arranged on the air supply pipeline 3, the first filter 14 is arranged at the inlet end of the air inlet machine 12, and the second filter 15 is arranged at the outlet end of the heater 13.

[0048] The first filter 14 can be a medium-efficiency filter with large pleated filter area, which can filter out large particles, dust, mosquitoes, hair and other impurities in the gas while ensuring the amount of fresh air. The second filter 15 is a high-temperature and high-efficiency filter, which can adapt to high-temperature conditions and intercept, adsorb and filter particles in the gas under high-temperature conditions.

[0049] In the embodiment of the utility model, the spray drying unit further comprises a separator 16, and the separator 16 has a gas inlet, a gas outlet and a solid outlet 17. The gas inlet of the separator 16 is connected with the drying device, the gas outlet of the separator 16 is connected with the exhaust pipeline 4, and the solid outlet 17 of the separator 16 is used for discharging the separated solid outward.

[0050] After the material to be dried is dried in the drying device, most of the dried material will deposit at the bottom of the drying device to be discharged through the discharge port 5 of the drying device. However, some of the dried material in powder or small particle form will inevitably enter the exhaust pipeline 4 together with the gas. That is, the material entering the exhaust pipeline 4 is a gas-solid mixture. The gas-solid mixture enters the separator 16, and the gas and the solid are separated in the separator 16, wherein the gas is discharged into the exhaust pipeline 4 through the gas outlet of the separator 16, and the solid is discharged through the solid outlet 17 of the separator 16.

[0051] The separator 16 can be, but is not limited to, a cyclone separator 16.

[0052] A material receiving device can be arranged below the solid outlet 17 of the separator 16 to receive and collect the solid material separated by the separator 16.

[0053] The material receiving device can be arranged as a receiving tank to collect and store the solid material separated by the separator 16. The material receiving device can also be arranged as a conveyor belt device to receive the solid material separated by the separator 16 and convey the received solid material to a target position.

[0054] In a further embodiment, the spray drying unit further comprises a third filter 18 arranged in the exhaust pipeline 4 and located downstream of the separator 16. The third filter 18 can further filter out solid impurities such as dust particles and small diameter particles from the gas separated by the separator 16, reduce the impurities in the exhaust pipeline 4, and avoid blocking the second gas passage of the evaporator 7.

[0055] The third filter 18 can be, but is not limited to, a bag filter.

[0056] In this embodiment, the spray drying system further comprises an exhaust fan 19 arranged in the exhaust pipeline 4. The exhaust fan 19 provides power for the flow of gas in the exhaust pipeline 4 to promote the flow of gas in the exhaust pipeline 4, increase the flow rate of gas in the second gas passage of the evaporator 7, and thus improve the evaporation efficiency.

[0057] The end of the gas supply pipeline 3 away from the drying device is in communication with the atmosphere, and air can be used as the gas source.

[0058] The end of the exhaust pipeline 4 away from the drying device is in communication with the atmosphere, and the gas in the exhaust pipeline 4 is directly discharged into the atmosphere after passing through the evaporator 7.

[0059] The utility model discloses a spray drying unit still includes storage tank 20 and second power pump 21, and storage tank 20 and second power pump 21 set up in feed pipe 2. Storage tank 20 is used for storing liquid material, and second power pump 21 is arranged between storage tank 20 and drying device, and second power pump 21 is used for pumping the material in storage tank 20 to drying device.

[0060] The second power pump 21 can be, but is not limited to, a peristaltic pump. The peristaltic pump rotates the roller by the motor, and the roller extrudes the hose when moving in the pump pipe, forms vacuum suction fluid, and then continues to roll to extrude the fluid, thereby realizing the pumping of the fluid. The peristaltic pump has strong self-suction capacity, can efficiently transport high-viscosity liquid and low-viscosity liquid, and has strong adaptability to the physical properties of the material to be dried by the spray drying system. Moreover, when the peristaltic pump transports the material, the material only contacts the pump pipe of the peristaltic pump, and the material does not contact the pump body, facilitating cleaning and maintenance.

[0061] In the embodiment, the drying device includes a drying chamber 22 and an atomizer 1, and the atomizer 1 is arranged at the inner top of the drying chamber 22. The atomizer 1 is connected with the feed pipe 2, and the atomizer 1 disperses and atomizes the material entering the drying chamber 22. After the material to be dried passes through the atomizer 1, the material can be atomized into fine droplets.

[0062] The drying chamber 22 provides a place for the contact of the atomized material and the heat source gas and the growth of the dried material.

[0063] The atomizer 1 can be, but is not limited to, a centrifugal atomizer.

[0064] In summary, the spray drying system provided by the embodiment of the utility model recovers the waste heat resource in the high-temperature gas in the exhaust pipe 4 of the spray drying unit by using the closed heat pump unit, heats the room temperature air in the gas supply pipe 3 of the spray drying unit again. The recovered heat is compressed and increased in enthalpy and then used as a drying heat source, thereby reducing the energy consumption and carbon emission of the spray drying system.

[0065] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model 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 to 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 utility model.

Claims

1. A spray drying system characterized by, The application relates to a spray drying unit and a heat pump unit. The spray drying unit comprises at least a drying device, a feed pipe (2), a gas supply pipe (3) and an exhaust pipe (4), the feed pipe (2) is adapted to supply material to be dried to the drying device, the gas supply pipe (3) is adapted to supply heat source gas to the drying device, and the exhaust pipe (4) is adapted to exhaust gas in the drying device, and the drying device has a discharge port (5) for the dried material. The heat pump unit comprises at least a compressor (6), an evaporator (7) and a condenser (8), the evaporator (7) is adapted to exchange heat between a heat exchange medium and gas in the exhaust pipe (4), and the condenser (8) is adapted to exchange heat between the heat exchange medium and gas in the gas supply pipe (3).

2. The spray drying system of claim 1, wherein, The condenser (8) has a first medium channel and a first gas channel, the evaporator (7) has a second medium channel and a second gas channel, the first gas channel of the condenser (8) is connected with the gas supply pipe (3), and the second gas channel of the evaporator (7) is connected with the exhaust pipe (4). The heat pump unit further comprises a liquid storage tank (9) and a throttle valve (10), the compressor (6), the first medium channel of the condenser (8), the throttle valve (10), the liquid storage tank (9) and the second medium channel of the evaporator (7) are sequentially connected to form a closed loop structure.

3. The spray drying system of claim 2, wherein, The heat pump unit further comprises a first power pump (11), the first power pump (11) is arranged between the liquid storage tank (9) and the second medium channel of the evaporator (7), and the first power pump (11) is adapted to provide power for the flow of the heat exchange medium.

4. The spray drying system of claim 2, wherein, The spray drying unit further comprises an air inlet fan (12) and a heater (13), the air inlet fan (12) and the heater (13) are arranged in the gas supply pipe (3), and the two ends of the first gas channel of the condenser (8) are respectively connected with the air inlet fan (12) and the heater (13).

5. The spray drying system of claim 4, wherein, The spray drying unit further comprises at least one of a first filter (14) and a second filter (15), the first filter (14) and the second filter (15) are arranged in the gas supply pipe (3), the first filter (14) is arranged at the inlet end of the air inlet fan (12), and the second filter (15) is arranged at the outlet end of the heater (13).

6. The spray drying system of claim 1, wherein, The spray drying unit further comprises a separator (16), the separator (16) has a gas inlet, a gas outlet and a solid outlet (17), the gas inlet of the separator (16) is connected with the drying device, the gas outlet of the separator (16) is connected with the exhaust pipe (4), and the solid outlet (17) of the separator (16) is used for exhausting separated solid.

7. The spray drying system of claim 1, wherein, The spray drying unit further comprises a third filter (18), the third filter (18) is arranged in the exhaust pipe (4), and the third filter (18) is adapted to filter gas in the exhaust pipe (4).

8. The spray drying system of claim 1, wherein, The spray drying system further comprises an exhaust fan (19) arranged in the exhaust pipeline (4), which provides power for the gas flow in the exhaust pipeline (4).

9. The spray drying system of claim 1, wherein, The spray drying unit further comprises a storage tank (20) and a second power pump (21) arranged in the feed pipeline (2), wherein the storage tank (20) is adapted to store liquid material, and the second power pump (21) is arranged between the storage tank (20) and the drying device, and is adapted to pump the material in the storage tank (20) to the drying device.

10. The spray drying system of claim 1, wherein, The drying device comprises a drying chamber (22) and an atomizer (1) arranged at the inner top of the drying chamber (22), wherein the atomizer (1) is connected with the feed pipeline (2), and is adapted to disperse and atomize the material entering the drying chamber (22).

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