Superheated steam drying apparatus and method with full heat-vapor recovery

Abstract

The application discloses a superheated steam drying device and method capable of realizing full recovery of heat-steam, and belongs to the technical field of energy saving and waste heat recovery of heat supply engineering. Main components of the device are a water vapor compressor, a condenser, a high-temperature and high-pressure water storage tank, an ejector and the like. The water vapor compressor replaces a boiler to supply high-temperature steam, the condenser plays a role of waste heat recovery and waste steam condensation, the high-temperature and high-pressure water storage tank temporarily stores high-temperature condensed water, and the ejector can realize non-energy-consumption utilization of low-temperature heat sources. Compared with the prior art, in theory, without taking inevitable heat loss into account, the device realizes full recovery of drying waste (exhaust) heat and waste water (steam), realizes energy saving and emission reduction, and has a remarkable effect of increasing efficiency and reducing consumption.

Description

Technical Field

[0001] This invention belongs to the field of energy conservation, emission reduction and waste heat recovery technology in heating engineering, and specifically relates to a superheated steam drying device and method that can realize full heat-steam recovery. Background Technology

[0002] Superheated steam drying is a novel drying method developed in recent years. It utilizes superheated steam as the drying medium to directly contact the material being dried, removing moisture. The moisture is carried into the superheated steam and then discharged from the dryer. Compared to traditional hot air drying, superheated steam drying has the following advantages:

[0003] 1) Fast drying rate

[0004] Because superheated steam has a higher specific heat and heat transfer coefficient than air, and the mass transfer resistance in the superheated steam drying medium is negligible, the moisture migration rate is fast, and the drying cycle can be significantly shortened.

[0005] 2) Good drying quality

[0006] The main reason for using superheated steam drying is to improve product quality. When using superheated steam as the drying medium, the material surface is moist and the drying stress is small, making it less prone to drying defects such as cracking and deformation. At the same time, since there is no oxidation reaction during superheated steam drying, the material color will not fade, resulting in good drying quality.

[0007] 3) Good security

[0008] Superheated steam drying eliminates the presence of air, preventing oxidation and combustion reactions and avoiding the risk of fire or explosion in the drying chamber. Some food ingredients that cannot normally be dried with hot air can be dried using superheated steam.

[0009] 4) Reduce the size of the equipment and the amount of exhaust gas purified.

[0010] Superheated steam has a high specific heat and requires less steam, which can reduce the size of the equipment and the amount of exhaust gas purified.

[0011] 5) It is beneficial to environmental protection

[0012] Superheated steam drying is carried out under sealed conditions, which greatly reduces the dust content. Superheated steam drying can eliminate the odor of municipal waste, sludge, etc.

[0013] 6) Has sterilization and disinfection effects

[0014] The temperature of the material dried by superheated steam is the boiling point of water under operating conditions. While drying food and pharmaceutical raw materials that require sterilization, it can also kill bacteria and other toxic microorganisms.

[0015] Since superheated steam is also discharged after drying (otherwise the moisture will not be carried away), if it is discharged directly without waste heat recovery, the heat loss will be too great and it will pollute the air. Summary of the Invention

[0016] To address the shortcomings of existing technologies, this invention provides a superheated steam drying device and method that enables full recovery of heat and steam, achieving full recovery of drying waste heat and wastewater (steam).

[0017] To achieve the above objectives, the present invention provides the following technical solution:

[0018] A superheated steam drying device capable of achieving full heat-steam recovery includes: a water storage tank, a dryer, a fan, a compressor, a condenser, and an ejector. The dryer has a material channel. The steam outlet of the dryer is connected to the steam inlet of the dryer via a first pipeline. The steam outlet of the water storage tank is connected to the high-pressure inlet of the ejector via a second pipeline. The steam outlet of the water storage tank is connected to the low-pressure inlet of the ejector via a third pipeline. The outlet of the ejector is connected to the steam inlet of the dryer via a fourth pipeline. The steam outlet of the dryer is connected to the steam inlet of the water storage tank via a fifth pipeline. The first pipeline passes through the fan and the condenser, the second pipeline passes through the compressor, and the fifth pipeline passes through the compressor and the condenser.

[0019] The superheated steam drying device that enables full heat-steam recovery as described above is further provided with a steam mass flow meter M1 and a thermometer T1 at the steam inlet of the dryer, and a thermometer T2 at the steam outlet of the dryer.

[0020] The superheated steam drying device that enables full heat-steam recovery as described above is further provided with a steam mass flow meter M2 and a first regulating valve on the first pipeline.

[0021] The superheated steam drying device that enables full heat-steam recovery as described above is further provided with a pressure reducing valve and a steam mass flow meter M5 at the steam outlet of the water storage tank.

[0022] As described above, the superheated steam drying device that enables full heat-steam recovery is further provided with a first shut-off valve, a fourth shut-off valve, a steam mass flow meter M3, a second regulating valve, a thermometer T3, a fourth regulating valve, and a steam mass flow meter M4 in the second pipeline.

[0023] The superheated steam drying device that enables full heat-steam recovery as described above further includes a first shut-off valve in the third pipeline.

[0024] As described above, the superheated steam drying device that enables full heat-steam recovery further includes a second shut-off valve in the fourth pipeline.

[0025] As described above, the superheated steam drying device that can achieve full heat-steam recovery is further provided with a third shut-off valve, a steam mass flow meter M3, a second regulating valve, a thermometer T3, a third regulating valve, and a thermometer T4 in the fifth pipeline.

[0026] The superheated steam drying device that enables full heat-steam recovery as described above is further provided with a conveyor belt inside the dryer, the conveyor belt extending from the material inlet of the dryer to the material outlet of the dryer, and the conveyor belt being configured in an S-shape.

[0027] A method for drying superheated steam with full heat-steam recovery, used in any of the superheated steam drying apparatuses with full heat-steam recovery as described above, comprising a first stage and a second stage:

[0028] In the first stage, the first, second, third, and fourth pipelines are connected, while the fifth pipeline is closed. The 120°C high-pressure water in the storage tank flashes into 120°C steam. Part of the steam enters the low-pressure inlet of the ejector, and part enters the compressor where it is compressed into 180°C steam, which then enters the high-pressure inlet of the ejector. The 120°C and 180°C steam mix in the ejector to become 150°C steam, which then enters the dryer. Some of the steam condenses on the material surface and the inner wall of the dryer. After being discharged, the waste steam becomes 110°C steam and is sent back to the dryer by a fan.

[0029] In the second stage, the high-temperature and high-pressure water storage tank stops supplying steam, the ejector stops working, the third shut-off valve opens, the first and fifth pipelines are connected, and the second, third, and fourth pipelines are shut off. After 150℃ steam with a flow rate of m1 enters the dryer, it carries away the moisture in the material inside the dryer. If the moisture is converted into steam and the steam flow rate is m2, then the total outflow of 110℃ steam is m1 + m2.

[0030] By adjusting the opening of the first regulating valve and the second regulating valve, the flow rate of 110℃ steam entering the blower is m1, and the flow rate entering the steam compressor is m2.

[0031] Steam with a flow rate of m2 is converted into steam at 180°C after exiting the compressor. The 180°C steam enters the condenser to heat the steam with a flow rate of m1 to 150°C. This portion of the 150°C steam with a flow rate of m1 is used as a drying medium and re-enters the dryer. The steam with a flow rate of m2 is condensed into 120°C high-pressure water.

[0032] Compared with the prior art, the advantages of this invention are as follows:

[0033] 1. Conventional superheated steam drying systems typically use boilers to supply superheated steam. The disadvantage is that boilers emit emissions that pollute the atmosphere. This invention, however, uses a steam compressor as the sole energy-consuming heat source for the drying process. The steam compressor eliminates the combustion process, providing clean heating – this is its primary innovation.

[0034] 2. Conventional superheated steam drying systems typically use gas-to-gas heat exchangers to recover heat. Because this recovers sensible heat, the heat exchanger needs to be large, and it still relies on dehumidification, resulting in air pollution. In contrast, this invention uses a condenser to recover heat, recovering latent heat with a high heat transfer coefficient and a very small condenser volume. Furthermore, it does not release material moisture into the atmosphere; instead, it condenses and stores the moisture, thus eliminating air pollution.

[0035] 3. A high-temperature, high-pressure water storage tank is used to collect the waste heat and moisture from the drying process. This can be used as preheating steam during the preheating stage of drying, or to compensate for unavoidable steam leakage losses. This eliminates the need for additional steam replenishment, meaning it does not require water replenishment like a boiler.

[0036] 4. An ejector is used to mix low-temperature, low-pressure steam and high-temperature, high-pressure steam into medium-temperature, medium-pressure steam that meets the drying parameters. This utilizes the heat from the low-temperature heat source without requiring additional energy consumption.

[0037] 5. All valves in this invention are automatically controlled electronic valves, and the steam compressor is a variable frequency compressor. The thermometers and flow meters in the system can obtain real-time steam data. Based on this data, the opening degree of the regulating valves and the output power of the steam compressor are automatically controlled through a pre-set operating program, so that the temperature and flow rate of the superheated steam in the drying system always operate at the predetermined values, resulting in more precise control of drying parameters and better drying quality. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of a superheated steam drying device capable of achieving full heat-steam recovery, according to an embodiment of the present invention.

[0040] Figure 2 for Figure 1 A schematic diagram of a superheated steam drying device with separate pipelines that enables full heat and steam recovery. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] Example:

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, in the embodiments of this invention are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0044] In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] See Figure 1 and Figure 2 This embodiment provides a superheated steam drying device capable of full heat-steam recovery, comprising: a water storage tank, a dryer, a fan, a compressor, a condenser, and an ejector. The dryer has a material channel; the steam outlet of the dryer is connected to the steam inlet of the dryer via a first pipeline; the steam outlet of the water storage tank is connected to the high-pressure inlet of the ejector via a second pipeline; the steam outlet of the water storage tank is connected to the low-pressure inlet of the ejector via a third pipeline; the outlet of the ejector is connected to the steam inlet of the dryer via a fourth pipeline; and the steam outlet of the dryer is connected to the steam inlet of the water storage tank via a fifth pipeline. The first pipeline passes through the fan and the condenser, the second pipeline passes through the compressor, and the fifth pipeline passes through the compressor and the condenser.

[0046] Specifically, the dryer is a sealed space where moisture is removed from the material, surrounded by insulating material. It has material inlets and outlets on the top and bottom, and steam inlets and outlets on the left and right sides. Wet material enters through the inlet and is evenly distributed onto the conveyor belt. Once the conveyor belt is full, the material inlets and outlets are closed, forming a sealed, insulated space inside the dryer. After drying, the material outlet opens, and the dry material is conveyed out of the dryer. A fan sends a portion of the exhaust steam from the dryer into the condenser. A steam compressor heats and pressurizes a portion of the exhaust steam from the dryer before sending it into the condenser or ejector. The steam compressor is the only device providing heat energy in this unit and is also the main energy consumer. The condenser is a heat exchanger that exchanges heat between the high-temperature, high-pressure superheated exhaust steam from the steam compressor (referred to as compressed exhaust steam) and the unheated superheated exhaust steam from the fan (referred to as fan exhaust steam). After heat exchange, the compressed exhaust steam cools down and condenses into high-pressure water. The fan exhaust steam is heated to the superheated steam temperature at the dryer inlet and re-enters the dryer as a drying medium. The high-temperature, high-pressure water storage tank is a pressure vessel tightly wrapped with insulation material and capable of withstanding high pressure. It is primarily used to store high-temperature, high-pressure condensate from the condenser. This tank collects both the waste heat and moisture from the drying process, which can be used as preheating steam during the preheating stage or to compensate for unavoidable steam leakage. This eliminates the need for additional steam replenishment, unlike boilers which require water replenishment. The low-pressure gas inlet of the ejector introduces saturated low-pressure steam from the high-temperature, high-pressure water storage tank via a pressure-reducing valve, while the high-pressure gas inlet introduces high-temperature, high-pressure steam from a steam compressor. The temperature of the mixed steam must equal the superheated steam temperature set at the dryer inlet. The ejector mixes the low-temperature, low-pressure steam and the high-temperature, high-pressure steam to create medium-temperature, medium-pressure steam that meets the drying parameters, utilizing the heat from the low-temperature heat source without requiring additional energy consumption.

[0047] Understandably, conventional superheated steam drying systems typically use boilers to supply superheated steam. The drawback is that boilers produce emissions and pollute the atmosphere. This invention, however, uses a steam compressor as the sole energy-consuming heat source for the drying process. Since the steam compressor eliminates combustion, it provides clean heating – this is its primary innovation.

[0048] Furthermore, waste heat recovery devices in typical superheated steam drying systems use gas-to-gas heat exchangers to recover heat. Because this recovers sensible heat, the heat exchangers need to be very large, and they still rely on dehumidification, which still pollutes the atmosphere. In contrast, this invention uses a condenser to recover heat, recovering latent heat, resulting in a very high heat transfer coefficient and a very small condenser volume. Moreover, it does not release material moisture into the atmosphere; instead, it condenses and stores it as water, thus eliminating air pollution.

[0049] See you again Figure 1The dryer has a steam mass flow meter M1 and a thermometer T1 at its steam inlet, and a thermometer T2 at its steam outlet. The first pipeline has a steam mass flow meter M2 and a first regulating valve. The water storage tank has a pressure reducing valve and a steam mass flow meter M5 at its steam outlet. The second pipeline has a first shut-off valve, a fourth shut-off valve, a steam mass flow meter M3, a second regulating valve, a thermometer T3, a fourth regulating valve, and a steam mass flow meter M4. The third pipeline has a first shut-off valve. The fourth pipeline has a second shut-off valve. The fifth pipeline has a third shut-off valve, a steam mass flow meter M3, a second regulating valve, a thermometer T3, a third regulating valve, and a thermometer T4. All valves in this invention are automatically controlled electronic valves. The steam compressor is a variable frequency compressor, and the thermometers and flow meters in the system can obtain real-time steam data. Based on this data, the opening degree of the regulating valves and the output power of the steam compressor are automatically controlled through a pre-set operating program, ensuring that the temperature and flow rate of the superheated steam in the drying system always operate at predetermined values, resulting in more precise control of drying parameters and better drying quality.

[0050] The dryer is equipped with a conveyor belt that extends from the material inlet to the material outlet of the dryer, and the conveyor belt is configured in an S-shape to achieve thorough drying of the material.

[0051] This embodiment also provides a superheated steam drying method that can achieve full heat-steam recovery, including a first stage and a second stage, specifically,

[0052] 1. First stage (power-on warm-up stage):

[0053] (1) The wet material enters from the inlet and is then evenly distributed on the conveyor belt. After the conveyor belt is filled, the material inlet and outlet are closed, and a sealed and heat-insulating space is formed inside the dryer.

[0054] (2) Open the pressure reducing valve, shut-off valve 1, shut-off valve 4, shut-off valve 2, regulating valve 1, regulating valve 2, and regulating valve 4; close shut-off valve 3 and regulating valve 3. Turn on the steam compressor and the blower. At this time, the 120℃ high-pressure water in the high-temperature and high-pressure water tank will flash into 120℃ steam. Part of the steam enters the low-pressure gas inlet of the ejector, and part enters the steam compressor to be compressed into 180℃ steam, and then enters the high-pressure gas inlet of the ejector. The 120℃ steam and 180℃ steam mix in the ejector to become 150℃ steam, which then enters the dryer. Because it is preheating, some steam will condense on the surface of the material and the inner wall of the dryer. Therefore, the flow rate of superheated steam entering the dryer will be greater than the flow rate of the exhaust steam. After the exhaust steam is discharged, it becomes 110℃ steam. The exhaust steam is sent back to the dryer by the blower.

[0055] 2. Second Phase (Stable Operation Phase)

[0056] (1) Preheating ends

[0057] As the material surface and the inner wall of the dryer heat up to a certain temperature, steam condensation decreases, and the amount of 110°C steam discharged increases. When the flow rate measured by steam mass flow meter M2 equals the flow rate measured by steam mass flow meter M1, it indicates that the steam no longer condenses in the dryer, and the preheating stage ends. At this time, shut-off valves 1, 2, and 4, and regulating valve 4 are closed, and regulating valve 3 is opened. Part of the 110°C steam exiting the dryer enters the blower, and part enters the steam compressor. The 110°C steam entering the blower is blown into the low-temperature fluid channel of the condenser. The high-temperature, high-pressure 180°C steam flowing from the steam compressor enters the high-temperature fluid channel (condensation channel) of the condenser through regulating valve 3. After heat exchange, the 110°C steam becomes 150°C steam, and the 180°C steam releases latent heat and condenses into water, which is then supercooled to become 120°C high-pressure water. The 120°C high-pressure water flows into the high-temperature, high-pressure water storage tank and is stored under insulation. During this stage, the ejector no longer functions, and the high-temperature, high-pressure tank no longer releases 120°C steam.

[0058] (2) Start drying

[0059] Once the wet material begins drying, it enters the automatic control stage. The temperature and flow rate of the superheated steam entering the dryer are pre-set drying process parameters based on different materials. The steam temperature is measured by thermometer T1, and the steam flow rate is measured by flow meter M1. 150℃ steam is the pre-set temperature, and the flow rate can be set to m1. When the 150℃ steam with a flow rate of m1 enters the dryer, it carries away the moisture in the material. This moisture is converted into steam, and the steam flow rate can be set to m2. The total flow rate of the 110℃ steam flowing out is m1 + m2. By adjusting the opening of regulating valves 1 and 2, the flow rate of the 110℃ steam entering the blower is m1 (measured by flow meter M2), and the flow rate entering the steam compressor is m2 (measured by flow meter M3). After exiting the compressor, the m2 steam becomes high-temperature, high-pressure steam (tentatively set at 180℃) and enters the condenser to heat the m1 steam to 150℃. This portion of the 150℃ steam with a flow rate of m1 is then used as the drying medium and re-enters the dryer. After the steam is condensed into 120°C high-pressure water, it not only removes moisture from the dried material but also recovers and preserves the waste heat generated inside the dryer.

[0060] In the above working cycle, only the steam compressor provides heat. The dryer does not discharge waste steam; instead, it uses a condenser to cool and retain the evaporated moisture. Therefore, neglecting other heat losses, all the waste heat from drying is recovered. The 120°C condensate recovered and stored in the high-temperature, high-pressure water tank is reused as a heat and steam source during the preheating phase of the dryer. Therefore, theoretically, without considering unavoidable heat losses, this device achieves complete recovery of drying waste heat and wastewater (steam).

[0061] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0062] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0064] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made based on the essence of the content of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for drying superheated steam that enables complete heat-steam recovery, characterized in that, The drying device includes a water storage tank, a dryer, a fan, a compressor, a condenser, and an ejector. The dryer has a material channel. The steam outlet of the dryer is connected to the steam inlet of the dryer via a first pipeline. The steam outlet of the water storage tank is connected to the high-pressure inlet of the ejector via a second pipeline. The steam outlet of the water storage tank is connected to the low-pressure inlet of the ejector via a third pipeline. The outlet of the ejector is connected to the steam inlet of the dryer via a fourth pipeline. The steam outlet of the dryer is connected to the steam inlet of the water storage tank via a fifth pipeline. The first pipeline passes through the fan and the condenser, and a first regulating valve is provided on the first pipeline. The second pipeline passes through the compressor, and a second regulating valve is provided on the second pipeline; the fifth pipeline passes through the compressor and the condenser; The drying method includes a first stage and a second stage: In the first stage, the first, second, third, and fourth pipelines are connected, while the fifth pipeline is closed. The 120°C high-pressure water in the storage tank flashes into 120°C steam. Part of the steam enters the low-pressure inlet of the ejector, and part enters the compressor to be compressed into 180°C steam, which then enters the high-pressure inlet of the ejector. The 120°C and 180°C steam mix in the ejector to become 150°C steam, which then enters the dryer. Part of the steam condenses on the surface of the material and the inner wall of the dryer. After being discharged, the exhaust steam becomes 110°C steam and is sent back to the dryer by the fan. In the second stage, the water storage tank stops supplying steam, the ejector stops working, the first and fifth pipelines are connected, and the second, third and fourth pipelines are cut off. After the 150°C steam with a flow rate of m1 enters the dryer, it carries away the moisture in the material inside the dryer. After the moisture is converted into steam, the steam flow rate is m2. The total flow rate of the 110°C steam flowing out is m1 + m2. By adjusting the opening of the first regulating valve and the second regulating valve, the flow rate of 110℃ steam entering the blower is m1, and the flow rate entering the compressor is m2. Steam with a flow rate of m2 is converted into steam at 180°C after exiting the compressor. The 180°C steam enters the condenser to heat the steam with a flow rate of m1 to 150°C. This portion of the 150°C steam with a flow rate of m1 is used as a drying medium and re-enters the dryer. The steam with a flow rate of m2 is condensed into 120°C high-pressure water.

2. The superheated steam drying method according to claim 1, which enables complete heat-steam recovery, is characterized in that, The steam inlet of the dryer is equipped with a steam mass flow meter M1 and a thermometer T1, and the steam outlet of the dryer is equipped with a thermometer T2.

3. The superheated steam drying method according to claim 1, which enables complete heat-steam recovery, is characterized in that... A steam mass flow meter M2 is installed on the first pipeline.

4. The superheated steam drying method according to claim 1, which enables complete heat-steam recovery, is characterized in that... The water vapor outlet of the water storage tank is equipped with a pressure reducing valve and a steam mass flow meter M5.

5. The superheated steam drying method according to claim 1, which enables complete heat-steam recovery, is characterized in that... The second pipeline is equipped with a first shut-off valve, a fourth shut-off valve, a steam mass flow meter M3, a thermometer T3, a fourth regulating valve, and a steam mass flow meter M4.

6. The superheated steam drying method according to claim 1, which enables complete heat-steam recovery, is characterized in that, The third pipeline is equipped with a first shut-off valve.

7. The superheated steam drying method according to claim 1, which enables complete heat and steam recovery, is characterized in that, The fourth pipeline is equipped with a second shut-off valve.

8. The superheated steam drying method according to claim 1, which enables complete heat-steam recovery, is characterized in that... The fifth pipeline is equipped with a third shut-off valve, a steam mass flow meter M3, a thermometer T3, a third regulating valve, and a thermometer T4.

9. The superheated steam drying method according to claim 1, which enables complete heat-steam recovery, is characterized in that, The dryer is equipped with a conveyor belt that extends from the material inlet of the dryer to the material outlet of the dryer, and the conveyor belt is configured in an S-shape.

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