CN115540575A - Salicylic acid flash drying system - Google Patents
Salicylic acid flash drying system Download PDFInfo
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- CN115540575A CN115540575A CN202211134815.XA CN202211134815A CN115540575A CN 115540575 A CN115540575 A CN 115540575A CN 202211134815 A CN202211134815 A CN 202211134815A CN 115540575 A CN115540575 A CN 115540575A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/003—Supply-air or gas filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/001—Heating arrangements using waste heat
- F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
- F26B23/005—Heating arrangements using waste heat recovered from dryer exhaust gases using a closed cycle heat pump system ; using a heat pipe system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a salicylic acid flash evaporation drying system, which relates to the technical field of salicylic acid drying and solves the technical problems that an original flash evaporation mode can cause energy loss and can not recycle gas, so that energy consumed by the whole system is saved; the heat pump evaporator, high temperature heat pump set, heat pump condenser and circulation booster fan constitute a set of energy recovery and recycle subassembly, retrieve and recycle produced gas, at the flash distillation in-process, reach better energy-conserving effect, and circulation booster fan adopts the pressurized mode of not equidimension to input gas according to input gas's volume simultaneously, adopts different guide factor, carries out the pressure boost, has promoted the pressure boost effect.
Description
Technical Field
The invention belongs to the technical field of salicylic acid drying, and particularly relates to a salicylic acid flash evaporation drying system.
Background
Salicylic acid is a fat-soluble organic acid with the chemical formula C 7 H 6 O 3 . The appearance is white crystalline powder, and the melting point is 158-161 ℃. It is an important fine chemical raw material existing in willow bark, folium Callicarpae Formosanae and Betula platyphylla in nature, and can be used for preparing medicine such as aspirin.
In the process of carrying out flash evaporation drying treatment on salicylic acid, filtering air of an original system, then providing power by an air blower, heating the air to 108-158 ℃ by a steam heating device, then feeding the air into an inlet at the bottom of a drying tower, cooling the hot air by the drying tower, carrying out cyclone separation and cloth bag dust removal, then cooling the air to 60-70 ℃, sucking exhaust gas by an induced draft fan, conveying the exhaust gas to a tail gas environment-friendly treatment device, and discharging the exhaust gas into the atmosphere after environment-friendly treatment;
in the method, a large amount of gas with temperature is discharged in the specific flash evaporation drying process, but the gas with temperature can be reused, so that the original flash evaporation method can cause energy loss and cannot recycle the gas, and the energy consumed by the whole system is saved.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art; therefore, the invention provides a salicylic acid flash evaporation drying system which is used for solving the technical problems that the original flash evaporation mode can cause energy loss, and gas cannot be recycled, so that the energy consumed by the whole system is saved.
In order to achieve the above object, an embodiment according to a first aspect of the present invention provides a salicylic acid flash evaporation drying system, which includes a flash evaporation dryer, a raw steam heater, a pressure equalizing tank, a circulating booster fan, a heat pump evaporator, a heat pump condenser, a high temperature heat pump unit, a cyclone separator, a bag-type dust collector, an induced draft fan, and a tail gas environmental protection device;
the high-temperature heat pump unit and the heat pump evaporator are used for cooling and dehydrating part of wet air after dust removal, then the heat pump condenser is used for heating the dehydrated dry air, and the heated dry air is pressurized and heated to about 130 ℃ by the circulating fan and is conveyed to the inlet of the dryer;
the circulating booster fan transmits the heated gas into the pressure equalizing box, the pressure equalizing box performs capacity expansion, pressure reduction and equalization on the heated gas and transmits the pressure equalized gas into the original steam heater, the original steam heater adopts a steel-aluminum composite finned tube as a main heat exchanger element, the heat in the steam is transmitted into the flash dryer, and the salicylic acid in the flash dryer is subjected to flash drying;
the flash dryer transmits gas generated in the flash drying process into the cyclone separator, the cyclone separator separates particles in the gas, and solid particles or liquid drops with larger inertial centrifugal force are thrown to the outer wall surface to be separated by virtue of rotary motion caused by tangential introduction of airflow;
the cyclone separator transmits the treated gas to the bag-type dust remover again, the bag-type dust remover adsorbs dust particles in the gas, and the treated gas is transmitted to the corresponding storage equipment.
Preferably, the inside gas of storage facilities is carried respectively to draught fan and heat pump evaporator in, wherein is provided with adjusting valve in the transmission pipeline, and the concrete parameter of inputing is controlled adjusting valve by operating personnel, the draught fan is with the gaseous transmission of received to the tail gas environment protection device in, tail gas environment protection device carries out purification treatment to the gas in the transmission course.
Preferably, the heat pump evaporator, the high-temperature heat pump unit, the heat pump condenser and the circulating booster fan form a group of energy recycling components, wherein the high-temperature heat pump unit and the heat pump evaporator are used for cooling part of wet air subjected to dust removal to 20 ℃ for dehydration, then the heat pump condenser is used for heating the part of dry air and supplemented fresh air, and the dry air heated to 110 ℃ is pressurized and heated to 130 ℃ by the circulating booster fan and is conveyed to the inlet of the dryer.
Preferably, the circulating booster fan comprises a gas parameter acquisition end, a circulating booster processing end, a control terminal and a storage terminal.
Preferably, the circulating booster fan adopts different boosting modes to the input gas according to the volume of the input gas, so that the overall temperature of the output gas reaches 130 ℃, wherein the specific boosting mode is as follows:
the gas parameter acquisition end acquires the volume of gas to be pressurized in advance, and marks the acquired volume of the gas as RJi, wherein i represents input gas in different stages;
the cyclic pressurization processing end compares the gas volume RJi with a comparison parameter Y1 in the storage terminal, when the gas volume RJi is larger than Y1, a guide factor X1 is obtained, and when the gas volume RJi is not larger than Y1, a guide factor X2 is obtained;
the pressure parameter YLi was obtained using YLi = RJi × X1/X2, where the internal/of the formula represents "or";
and transmitting the pressure parameter YLi to a control terminal, adjusting the pressure parameter of the circulating booster fan to YLi by the control terminal, and pressurizing the input gas to enable the temperature of the output gas to reach 130 ℃.
Compared with the prior art, the invention has the beneficial effects that: the high-temperature heat pump unit and the heat pump evaporator are used for cooling and dehydrating part of wet air after dust removal, then the heat pump condenser is used for heating the dehydrated dry air, and the heated dry air is pressurized and heated to about 130 ℃ by the circulating fan and is conveyed to the inlet of the dryer; the system comprises a circulating booster fan, a pressure equalizing box, a flash evaporation drier, a heat pump evaporator, a high-temperature heat pump unit, a heat pump condenser and the circulating booster fan, wherein the circulating booster fan is used for transmitting heated gas into the pressure equalizing box, the pressure equalizing box is used for expanding and decompressing the heated gas and balancing the pressure equalized gas and transmitting the pressure equalized gas into the original steam heater, the original steam heater adopts a steel-aluminum composite finned tube as a main heat exchanger element, the heat inside the steam is transmitted into the flash evaporation drier, the salicylic acid inside the flash evaporation drier is subjected to flash evaporation drying treatment, the heat pump evaporator, the high-temperature heat pump unit, the heat pump condenser and the circulating booster fan form a set of energy recycling component, the generated gas is recycled, a better energy-saving effect is achieved in the flash evaporation process, meanwhile, the circulating booster fan adopts different boosting modes for the input gas according to the volume of the input gas, adopts different guide factors to boost, and the boosting effect is improved.
Drawings
FIG. 1 is a schematic overall framework of the present invention;
fig. 2 is a schematic diagram of the principle framework of the circulation booster fan of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the application provides a salicylic acid flash evaporation drying system, which includes a flash evaporation dryer, a raw steam heater, a pressure equalizing box, a circulating booster fan, a heat pump evaporator, a heat pump condenser, a high-temperature heat pump unit, a cyclone separator, a bag-type dust collector, a draught fan and a tail gas environment-friendly device;
the high-temperature heat pump unit and the heat pump evaporator are used for cooling and dehydrating part of wet air after dust removal, then the heat pump condenser is used for heating the dehydrated dry air (simultaneously supplementing part of fresh air), and the heated dry air is pressurized and heated to about 130 ℃ by the circulating fan and is conveyed to the inlet of the dryer;
the circulating booster fan transmits the heated gas into the pressure equalizing box, the pressure equalizing box performs capacity expansion, pressure reduction and equalization on the heated gas and transmits the pressure equalized gas into the original steam heater, the original steam heater adopts a steel-aluminum composite finned tube as a main heat exchanger element, the heat in the steam is transmitted into the flash dryer, and the salicylic acid in the flash dryer is subjected to flash drying;
the flash dryer transmits gas generated in the flash drying process into the cyclone separator, the cyclone separator separates particles in the gas, and solid particles or liquid drops with larger inertial centrifugal force are thrown to the outer wall surface to be separated by virtue of rotary motion caused by tangential introduction of airflow;
the cyclone separator transmits the processed gas into the bag-type dust collector again, the bag-type dust collector absorbs dust particles in the gas and transmits the processed gas into corresponding storage equipment;
the gas in the storage equipment is respectively conveyed into an induced draft fan and a heat pump evaporator, wherein a regulating valve is arranged in a transmission pipeline, the input specific parameters are controlled and regulated by an operator, the induced draft fan transmits the received gas into a tail gas environment-friendly device, and the tail gas environment-friendly device purifies the gas in the transmission process;
the heat pump evaporator, the high temperature heat pump set, heat pump condenser and circulation booster fan constitute a set of energy recovery and recycle subassembly, wherein high temperature heat pump set and heat pump evaporator are the dehydration of cooling to 20 ℃ for the wet air after the dust removal, and then by the heat pump condenser for this part dry air and supplementary new trend intensification, the dry air that is heated up to 110 ℃ is carried to the desiccator entry about 130 ℃ through circulation booster fan pressurization intensification, salicylic acid feed rate is 1500kg/h, wherein the water content is 15%, the water content is less than or equal to 0.5% after the drying, the minimum dehydration volume of drying tower is:
1500*(15-0.5)/100＝217.5kg/h；
the air temperature after dust removal is 70 ℃, the air temperature of a heat pump evaporator is calculated according to 20 ℃, the specific heat capacity of water vapor is 1.88 kJ/(kg. K), the latent heat of vaporization of water is 2260kJ/kg, the circulating air quantity is 13000 m/h, and the air density is 1.2kg/m 3 And the specific heat of the air is 1.0 kJ/(kg. K), the refrigerating capacity of the heat pump evaporator is as follows:
(1.88*50+2260)*217.5/3600+1*13000*1.2*50/3600＝359kW；
considering the fluctuation of the system energy, the maximum load is selected according to a coefficient of 1.5:
359*1.5＝539kW
therefore, the heat pump unit can be selected:
the refrigerating output is 560kW, and the heating capacity is 720, and the model is: one air-air type unit of ZG-56/72 TF-FF-7020-20100;
the circulating booster fan comprises a gas parameter acquisition end, a circulating booster processing end, a control terminal and a storage terminal;
the gas parameter acquisition end output end is electrically connected with the circulating pressurization processing end input end, the circulating pressurization processing end is in bidirectional connection with the storage terminal, and the circulating pressurization processing end output end is electrically connected with the control terminal input end;
referring to fig. 2, the circulating booster fan adopts different boosting modes for the input gas according to the volume of the input gas, so that the overall temperature of the output gas reaches 130 ℃, wherein the specific boosting mode is as follows:
the gas parameter acquisition end is used for acquiring the volume of gas to be pressurized in advance, and marking the acquired volume of the gas as RJi, wherein i represents input gas in different stages;
comparing the gas volume RJi with a comparison parameter Y1 in the storage terminal by the cyclic pressurization processing end, acquiring a guide factor X1 when the gas volume RJi is greater than Y1, and acquiring a guide factor X2 (wherein the corresponding guide factors of gases with different gas volumes are different) when the gas volume RJi is not greater than Y1;
the pressure parameter YLi was obtained using YLi = RJi × X1/X2, where the internal/of the formula represents "or";
and transmitting the pressure parameter YLi to a control terminal, adjusting the pressure parameter of the circulating booster fan to YLi by the control terminal, and pressurizing the input gas to enable the temperature of the output gas to reach 130 ℃.
Experiment of
As a set of embodiments of the present invention, the heat pump evaporator, the high temperature heat pump unit, the heat pump condenser and the circulating booster fan constitute a set of energy recycling components, and specific energy saving parameters are as follows:
the steam consumption of the original system is 1.4t/h, the unit price of the steam is 271.16 yuan/t, the annual steam consumption is calculated according to 1.2 tons of steam saved per hour
1.2*21*320＝8064t/y
Use and stride critical carbon dioxide high temperature heat pump set + circulation booster fan to replace steam for drying tower air heating, save former blower and draught fan, be 160kW through calculating high temperature heat pump set power of use, the refrigerating output is 560kW, the heating capacity is 720kW, circulation fan power of use is 80kW, because high temperature heat pump set + circulation booster fan replace air-blower + draught fan, the electric quantity that increases every year is:
(160+80-18-39/2)*21*330＝1360800kW·h/y
the known 0.6MPa steam temperature is 158.84 ℃, and the enthalpy value is 2756.4kJ/kg; the enthalpy value of the water at 20 ℃ is 84.5kJ/kg; the steam utilization efficiency is generally 70%, the electricity produced at 1 degree is 0.32 kg of standard coal, the heat value of the standard coal is 7000kCal/kg, and the annual standard coal amount is as follows:
8064 (2756.4-84.5) 0.2389/7000/0.7-1337490 0.32/1000=622 ton standard coal/year
Emission reduction of CO2 amount: 622 × 2.62=1630 ton/year
Saving cost
The comprehensive electricity price is about 0.725 yuan/degree, and the steam price is 271.16 yuan/t. A transcritical carbon dioxide high-temperature heat pump unit is adopted to replace steam heating, the steam quantity is saved by 8064t/y each year, and the electricity quantity is increased by 1337490kW.h each year.
(8064 × 271.16-1360800 × 0.725)/10000 ten thousand yuan/year (120 ten thousand yuan/year)
Can save 120 ten thousand yuan each year, and has obvious benefit.
1. Model selection calculation of unit
(1) The special transcritical carbon dioxide high-temperature heat pump unit evaporator cools part of wet air after dust removal to 20 ℃ for dehydration, then the heat pump condenser heats the part of dry air and supplemented fresh air, and the dry air heated to 110 ℃ is pressurized by the circulating pressurization fan to be heated to about 130 ℃ and is conveyed to the inlet of the dryer. The feed amount of the salicylic acid is 1500kg/h, wherein the water content is 15 percent, the water content after drying is less than or equal to 0.5 percent, and the minimum dehydration amount of a drying tower is as follows:
1500*(15-0.5)/100＝217.5kg/h；
the air temperature after dust removal is 70 ℃, the air temperature after dust removal is calculated by an evaporator according to 20 ℃, the specific heat capacity of the water vapor is 1.88 kJ/(kg. K), the latent heat of vaporization of the water is 2260kJ/kg, and the circulating air amount is 13000m 3 H, air density 1.2kg/m 3 And the specific heat of the air is 1.0 kJ/(kg. K), the refrigerating capacity of the heat pump evaporator is as follows:
(1.88*50+2260)*217.5/3600+1*13000*1.2*50/3600＝359kW；
considering the fluctuation of the system energy, the maximum load is selected according to a coefficient of 1.5:
359*1.5＝539kW
therefore, the heat pump unit can be selected:
the refrigerating output is 560kW, and the heating capacity is 720, and the model is: one air-air type unit of ZG-56/72 TF-FF-7020-20100.
The main parameters of the unit are as follows:
part of data in the formula is obtained by removing dimension and taking the value to calculate, and the formula is obtained by simulating a large amount of collected data through software and is closest to a real situation; the preset parameters and the preset threshold values in the formula are set by those skilled in the art according to actual conditions or obtained through simulation of a large amount of data.
The working principle of the invention is as follows: the high-temperature heat pump unit and the heat pump evaporator are used for cooling and dehydrating part of wet air after dust removal, then the heat pump condenser is used for heating the dehydrated dry air (simultaneously supplementing part of fresh air), and the heated dry air is pressurized and heated to about 130 ℃ by the circulating fan and is conveyed to the inlet of the dryer; the system comprises a circulating booster fan, a pressure equalizing box, a flash dryer and a heat pump evaporator, wherein the circulating booster fan is used for transmitting heated gas into the pressure equalizing box, the pressure equalizing box is used for expanding the heated gas, reducing pressure and equalizing the pressure of the gas, the gas after pressure equalizing is transmitted into a primary steam heater, the primary steam heater adopts a steel-aluminum composite finned tube as a main heat exchanger element, the heat inside steam is transmitted into the flash dryer, salicylic acid inside the flash dryer is subjected to flash drying, a heat pump evaporator, a high-temperature heat pump unit, a heat pump condenser and the circulating booster fan form a set of energy recycling assembly, the generated gas is recycled, a better energy-saving effect is achieved in the flash process, and meanwhile the circulating booster fan adopts different boosting modes for the input gas according to the volume of the input gas, adopts different guide factors for boosting, and improves the boosting effect.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.
Claims (5)
1. A salicylic acid flash evaporation drying system is characterized by comprising a flash evaporation dryer, a raw steam heater, a pressure equalizing box, a circulating booster fan, a heat pump evaporator, a heat pump condenser, a high-temperature heat pump unit, a cyclone separator, a bag-type dust collector, an induced draft fan and a tail gas environment-friendly device;
the high-temperature heat pump unit and the heat pump evaporator are used for cooling and dehydrating part of wet air after dust removal, then the heat pump condenser is used for heating the dehydrated dry air, and the heated dry air is pressurized by the circulating fan and heated to about 130 ℃ and is conveyed to the inlet of the dryer;
the circulating booster fan transmits the heated gas into the pressure equalizing box, the pressure equalizing box performs capacity expansion, pressure reduction and equalization on the heated gas and transmits the pressure equalized gas into the original steam heater, the original steam heater adopts a steel-aluminum composite finned tube as a main heat exchanger element, the heat in the steam is transmitted into the flash dryer, and the salicylic acid in the flash dryer is subjected to flash drying;
the flash dryer transmits gas generated in the flash drying process into the cyclone separator, the cyclone separator separates particles in the gas, and solid particles or liquid drops with larger inertial centrifugal force are thrown to the outer wall surface to be separated by virtue of rotary motion caused by tangential introduction of airflow;
the cyclone separator transmits the treated gas to the bag-type dust remover again, the bag-type dust remover adsorbs dust particles in the gas, and the treated gas is transmitted to the corresponding storage equipment.
2. The salicylic acid flash evaporation drying system of claim 1, wherein the gas inside the storage device is respectively delivered to an induced draft fan and a heat pump evaporator, wherein a regulating valve is arranged in the delivery pipeline, the specific parameters input are controlled and regulated by an operator, the induced draft fan delivers the received gas to a tail gas environment-friendly device, and the tail gas environment-friendly device purifies the gas during delivery.
3. The salicylic acid flash evaporation drying system of claim 1, wherein the heat pump evaporator, the high temperature heat pump unit, the heat pump condenser and the circulating booster fan constitute a set of energy recycling components, wherein the high temperature heat pump unit and the heat pump evaporator dehydrate part of the wet air after dust removal to 20 ℃, the heat pump condenser heats the part of the dry air and the supplemented fresh air, and the dry air heated to 110 ℃ is pressurized and heated to about 130 ℃ by the circulating booster fan and is delivered to the inlet of the dryer.
4. The salicylic acid flash drying system of claim 3 wherein the circulating booster fan comprises a gas parameter acquisition terminal, a circulating booster processing terminal, a control terminal and a storage terminal.
5. The salicylic acid flash drying system of claim 4 wherein the recycle booster fan boosts the input gas to different degrees according to the volume of the input gas, so that the overall temperature of the output gas reaches 130 ℃, wherein the specific boosting mode is as follows:
the gas parameter acquisition end is used for acquiring the volume of gas to be pressurized in advance, and marking the acquired volume of the gas as RJi, wherein i represents input gas in different stages;
the cyclic pressurization processing end compares the gas volume RJi with a comparison parameter Y1 in the storage terminal, when the gas volume RJi is larger than Y1, a guide factor X1 is obtained, and when the gas volume RJi is not larger than Y1, a guide factor X2 is obtained;
the pressure parameter YLi was obtained using YLi = RJi × X1/X2, where the internal/of the equation represents "or";
and transmitting the pressure parameter YLi to a control terminal, adjusting the pressure parameter of the circulating booster fan to YLi by the control terminal, and pressurizing the input gas to enable the temperature of the output gas to reach 130 ℃.
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| CN211650948U (en) * | 2019-12-16 | 2020-10-09 | 江阴市南方干燥设备有限公司 | Closed cycle type spin flash drying equipment |
| CN212198888U (en) * | 2020-04-09 | 2020-12-22 | 浙江浙能技术研究院有限公司 | Desulfurization waste water concentration decrement device based on film evaporation technique |
| CN215909273U (en) * | 2021-04-05 | 2022-02-25 | 上海复璐帝流体技术有限公司 | Carbon dioxide phase change liquefaction circulation heating system and air conditioner heater |
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