Material drying system and processing equipment

Abstract

The utility model discloses a material drying system and processing equipment, relates to the technical field of drying, and aims to solve the problems that in the prior art, when hot flue gas is adopted as a heat source to dry biomass, dust is accumulated in a pipeline, so that the heat exchange efficiency is reduced, and the drying efficiency of the biomass is reduced. The material drying system comprises a drying unit and a steam generating unit. The drying unit comprises a first pipeline and a first container with a containing space, the first pipeline and the first container are arranged in a matched mode, and the containing space is used for containing materials to be dried. The steam generation unit is used for heating water to form steam, the steam generation unit is communicated with the first pipeline, and the steam generation unit is used for supplying steam to the first pipeline to dry the to-be-dried material. The steam generation unit communicates with the containing space and is used for supplying steam to the containing space so as to fluidize the to-be-dried materials located in the containing space.

Description

TECHNICAL FIELD

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

[0002] In the process of biomass resource utilization, biomass needs to be dried. The biomass drying system in the prior art generally uses hot flue gas as a heat source and uses a spiral pipeline to transport biomass raw materials. In the actual drying process, heat is exchanged between the hot flue gas and the biomass to be dried located in the pipeline to achieve the purpose of drying the biomass.

[0003] However, in the process of drying biomass using hot flue gas as a heat source, there is a problem of ash accumulation in the pipeline, which reduces the heat exchange efficiency and further reduces the drying efficiency of the biomass. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a material drying system and processing equipment for improving the heat exchange efficiency of the material to be dried and water vapor and improving the drying efficiency of the material to be dried.

[0005] In order to achieve the above-mentioned purpose, in the first aspect, the utility model provides a material drying system. The material drying system comprises a drying unit and a steam generating unit. The drying unit comprises a first pipeline and a first container with a containing space, the first pipeline is arranged in cooperation with the first container, and the containing space is used for containing the material to be dried. The steam generating unit is used for heating water to form steam, the steam generating unit is communicated with the first pipeline, and the steam generating unit is used for supplying steam to the first pipeline to dry the material to be dried. The steam generating unit is communicated with the containing space, and the steam generating unit is used for supplying steam to the containing space to fluidize the material to be dried located in the containing space.

[0006] The material drying system provided by the utility model, first pipeline and first container cooperate to set up, and the containing space is used for containing the material to be dried. The steam generating unit is used for heating water to form steam (namely water vapor), and the steam generating unit is communicated with the first pipeline, and the steam generating unit is used for supplying steam to the first pipeline to dry the material to be dried (namely non-contact drying). Therefore, the utility model dries the material to be dried by water vapor in the first pipeline, compared with the way of drying the material to be dried by hot flue gas in the prior art, the water vapor used by the utility model will not cause the problem of ash accumulation in the first pipeline. Therefore, compared with the prior art, the influence on heat transfer can be reduced, and the thermal resistance can be reduced, so that the heat exchange efficiency of the material to be dried and the water vapor is improved, and the drying efficiency of the material to be dried is improved. Further, the steam generating unit is communicated with the containing space, and the steam generating unit is used for supplying steam to the containing space to fluidize the material to be dried in the containing space (namely contact fluidization). At this time, the material to be dried in the containing space is in a fluidized state, the uniformity of heat exchange of the material to be dried can be improved, so that the heat exchange efficiency of the material to be dried and the water vapor is further improved, and the drying efficiency of the material to be dried is further improved. In addition, under the cooperation of the above-mentioned non-contact drying and contact fluidization, not only the rapid drying of the material to be dried can be realized, but also the flow of steam in the two ways can be adjusted according to the actual drying demand, so that different application scenarios can be adapted to, and the application range of the material drying system is expanded.

[0007] In an implementation manner, the material drying system further comprises a second pipeline. A first end of the second pipeline is communicated with the containing space, and a second end of the second pipeline is communicated with the first pipeline and / or the containing space.

[0008] In the technical scheme, the mixture containing steam is utilized twice, so that the water consumption during drying can be saved, and the drying cost is reduced. Further, the material contained in the mixture can be recycled, and the loss of the material is reduced.

[0009] In an implementation manner, the material drying system further comprises a filtering unit arranged on the second pipeline and used for separating the mixture to obtain steam and a small amount of dried material carried out by the steam.

[0010] In the technical scheme, the filtering unit is used to separate the steam and the small amount of dried material carried out by the steam in the mixture, the separated steam enters the first pipeline and / or returns to the containing space through the second pipeline, and is used for drying and / or fluidizing the material to be dried in the first container. The separated steam is utilized twice, so that the water consumption during drying can be saved, the drying cost is reduced, and the introduction of impurities into the first pipeline and the equipment failure caused by the introduction of impurities can be avoided.

[0011] In an implementation, the material drying system further comprises: a first pressurizing element, two ends of the first pressurizing element being in communication with the second pipeline and the first pipeline respectively; the first pressurizing element is configured to pressurize the steam separated by the filtering unit and deliver the steam to the first pipeline to dry the material to be dried. And / or, a second pressurizing element, two ends of the second pressurizing element being in communication with the second pipeline and the containing space respectively; the second pressurizing element is configured to pressurize the steam separated by the filtering unit and deliver the steam to the containing space to fluidize the material to be dried.

[0012] In an implementation, the material drying system further comprises: a first collecting unit, the first collecting unit being in communication with the filtering unit and the drying unit to collect the dried material, thereby facilitating the later use of the collected dried material.

[0013] In an implementation, the first collecting unit is in communication with the steam generating unit through a pipeline provided with a feeding member, and is configured to provide the steam generating unit with the dried material for heating water.

[0014] With the above technical solution, the steam generating unit heats water using the heat generated by the combustion of the obtained dried material to form hot water vapor, and then uses the hot water vapor to dry and fluidize the material to be dried in the containing space to obtain dried material. In this process, the heat balance of the entire material drying system is achieved.

[0015] In an implementation, the material drying system further comprises: a second collecting unit and a circulating pump, the second collecting unit being in communication with the first pipeline to collect the steam and / or liquid water after the material to be dried is dried, thereby facilitating the later use of the collected steam and / or liquid water and realizing the recycling of water resources.

[0016] Further, two ends of the circulating pump are in communication with the second collecting unit and the steam generating unit respectively, and the steam and / or liquid water in the second collecting unit is transmitted to the steam generating unit by the circulating pump.

[0017] With the above technical solution, the steam and / or liquid water obtained by drying the material to be dried is transmitted to the steam generating unit as a raw material required for drying, which not only realizes the recycling of water resources, but also reduces the additional water supply to the steam generating unit and reduces the drying cost.

[0018] In an implementation, the material drying system further comprises: a preheating unit, the preheating unit comprising a third pipeline and a second container having a containing cavity, the third pipeline being arranged in cooperation with the second container, and the containing cavity being configured to contain the material to be dried.

[0019] The third pipeline is communicated with the first pipeline for transferring the steam and / or liquid water in the first pipeline into the third pipeline to pre-dry the material to be dried in the containing cavity.

[0020] In the above technical solution, after the single drying of the material to be dried by the drying unit, the steam in the first pipeline still has a certain temperature, so the preheating unit can use the steam from the drying unit and having a certain temperature to pre-dry the material to be dried in the containing cavity. At this time, not only the drying time of the subsequent material to be dried in the drying unit can be shortened, and the drying efficiency can be improved, but also the waste of heat can be reduced, and the resource utilization rate can be improved.

[0021] Further, the third pipeline is communicated with the second collecting unit for transferring the steam and / or liquid water in the third pipeline into the second collecting unit, so that the utilization rate of water resources can be improved.

[0022] In a second aspect, the utility model also provides a processing equipment. The processing equipment comprises the material drying system described in the above technical solution.

[0023] Compared with the prior art, the processing equipment provided by the utility model has the same beneficial effects as the material drying system described in the above technical solution, which will not be repeated here.

[0024] In an implementation manner, the processing equipment is a biomass gasification equipment. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are included to provide a further understanding of the utility model, form a part of the utility model and are used to explain the utility model together with the specification, but do not constitute improper limitations on the utility model. In the drawings:

[0026] Figure 1 Fig. 1 is a structural schematic view of a first material drying system in an embodiment of the utility model;

[0027] Figure 2 Fig. 2 is a structural schematic view of a second material drying system in an embodiment of the utility model;

[0028] Figure 3 Fig. 3 is a structural schematic view of a third material drying system in an embodiment of the utility model.

[0029] Reference Signs:

[0030] 1 - drying unit, 10 - first pipe, 11 - first container; 2 - steam generating unit, 3 - fourth pipe, 4 - fifth pipe, 5 - feeding unit, 6 - second pipe, 7 - first pressurizing element, 8 - second pressurizing element, 90 - filtering unit, 91 - first collecting unit, 92 - feeding member, 93 - second collecting unit, 94 - circulating pump, 95 - preheating unit, 950 - third pipe, 951 - second container. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0034] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and should not be construed as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application.

[0035] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] As a major agricultural country, China possesses abundant biomass resources, broadly defined as agricultural biomass, forestry biomass, and waste materials such as cattle and sheep manure. Currently, large-scale resource utilization of biomass resources is challenging, with high water content being a significant factor restricting its large-scale utilization. For example, wheat and corn straw typically contain 20%–30% moisture after harvest, rice straw naturally dried in the field contains approximately 17% moisture, and undried sawdust and bamboo chips can have moisture contents as high as 50%–60%. Fresh cow manure contains 83.3% moisture, and fresh sheep manure contains approximately 30%–80% moisture. Excessive moisture content leads to reduced combustion efficiency, increased processing costs, and compromised physical properties, directly increasing the difficulty of biomass gasification technology and reducing the economic viability of biomass resource utilization. Therefore, biomass drying technology is necessary to control and optimize moisture content during biomass resource utilization.

[0037] To address at least some of the aforementioned technical problems, in a first aspect, embodiments of this utility model provide a material drying system. The material may be biomass, coal, ore, or other materials. The following description uses biomass as an example; it should be understood that the following description is for illustrative purposes only and not for specific limitation.

[0038] See Figure 1 The material drying system includes a drying unit 1 and a steam generating unit 2. The drying unit 1 includes a first pipe 10 and a first container 11 with a receiving space. The first pipe 10 and the first container 11 are configured to cooperate, and the receiving space is used to hold the material to be dried. The steam generating unit 2 is used to heat water to generate steam; the steam generating unit 2 is connected to the first pipe 10 and is used to supply steam to the first pipe 10 to dry the material to be dried; the steam generating unit 2 is also connected to the receiving space of the first container 11 and is used to supply steam to the receiving space of the first container 11 to fluidize the material to be dried within the receiving space. The aforementioned "fluidization" refers to the material to be dried or semi-dried being suspended in a hot air stream, or tumbling and colliding with each other in the hot air stream, allowing for heat and mass transfer between the gas and solid phases to achieve material drying.

[0039] Specifically, see Figure 1The material drying system provided by the embodiment of the utility model, first pipeline 10 and first container 11 cooperate to set, the containing space is used for containing the material to be dried. The steam generating unit is used for heating water to form steam (namely water vapor), and the steam generating unit 2 supplies steam for the first pipeline 10 through the fourth pipeline 3 to dry the material to be dried (namely non-contact drying). Therefore, the embodiment of the utility model dries the material to be dried by water vapor in the first pipeline 10, compared with the way of drying the material to be dried by hot flue gas in the prior art, the water vapor used in the embodiment of the utility model will not cause the problem of ash accumulation in the first pipeline 10. Therefore, compared with the prior art, the influence on heat transfer can be reduced, the thermal resistance can be reduced, and the heat exchange efficiency of the material to be dried and the water vapor can be improved, so that the drying efficiency of the material to be dried can be improved. Further, the steam generating unit 2 communicates with the containing space through the fifth pipeline 4, and the steam generating unit 2 supplies steam for the containing space of the first container 11 through the fifth pipeline 4 to at least fluidize the material to be dried in the containing space (namely contact fluidization). At this time, the material to be dried in the containing space is in a fluidized state, the uniformity of heat exchange of the material to be dried can be improved, the heat exchange efficiency of the material to be dried and the water vapor can be further improved, and the drying efficiency of the material to be dried can be further improved. In addition, under the cooperation of the above-mentioned non-contact drying and contact fluidization, not only the rapid drying of the material to be dried can be realized, but also the flow of steam in the two ways can be adjusted according to the actual drying demand, so that different application scenarios can be adapted, and the application range of the material drying system can be expanded.

[0040] The relative position relationship of the first pipeline and the first container included in the drying unit can be set according to actual needs. For example, the first pipeline 10 can be arranged in the containing space of the first container 11. Alternatively, the first pipeline is arranged on the outer wall of the first container, and at this time, the first pipeline is located outside the containing space. Alternatively, when the wall of the first container is a double-layer structure, the first pipeline is arranged in the interlayer of the wall, and at this time, the first pipeline is located outside the containing space.

[0041] The arrangement mode of the first pipeline is not limited here, and only needs to meet the actual needs. For example, the first pipeline can be arranged in the first container in a Z-shaped, serpentine or linear shape.

[0042] The specific structure, material and the like of the first pipeline, the first container, the fourth pipeline and the fifth pipeline are not limited here, and only need to ensure that the drying proceeds normally without reacting with the material.

[0043] The steam generating unit can be a steam generating unit in the prior art, such as a boiler, a heater, etc., and the specific structure of the steam generating unit is not described in detail herein. In actual use, the water heated by the steam generating unit and the fuel used to heat the water can be supplied from outside. Further, the flow and temperature of the steam generated by the steam generating unit can be adjusted according to the needs of the drying device.

[0044] Before actual drying, the material to be dried can be manually put into the drying unit by a person, or the material to be dried can be put into the drying unit by the feeding unit. For example, see Figure 1 The material drying system can further include a feeding unit 5 in communication with the containing space of the first container 11, for providing the drying unit 1 with the material to be dried. At this time, the participation of a person can be reduced, the work efficiency can be improved, and the safety of the worker can be ensured.

[0045] As a possible implementation, see Figure 2 The material drying system further includes a second pipeline 6. A first end of the second pipeline 6 is in communication with the containing space, and a second end of the second pipeline 6 is in communication with the first pipeline 10 and / or the containing space. The mixture including steam generated after the drying unit 1 dries the material to be dried enters the first pipeline 10 and / or returns to the containing space through the second pipeline 6.

[0046] In the case of the above technical solution, by reusing the mixture including steam, the amount of water required for drying can be saved, and the drying cost can be reduced. Further, the material contained in the mixture can be recycled, and the loss of the material can be reduced.

[0047] In an alternative way, see Figure 2 The material drying system can further include a filtering unit 90. The filtering unit 90 is arranged on the second pipeline 6, for separating the mixture to obtain steam and a small amount of dried material carried out by the steam. For example, the filtering unit can be a dust collector.

[0048] In the case of the above technical solution, the filtering unit 90 is used to separate the steam and a small amount of dried material carried out by the steam in the mixture, the separated steam enters the first pipeline 10 and / or returns to the containing space through the second pipeline 6, for drying and / or fluidizing the material to be dried in the first container 11. By reusing the separated steam, not only the amount of water used in the drying process can be saved, and the drying cost can be reduced, but also impurities can be avoided from being introduced into the first pipeline 10, and equipment failure can be avoided.

[0049] In an alternative way, see Figure 2, the material drying system further comprises: a first pressurizing element 7, two ends of the first pressurizing element 7 being communicated with the second pipeline 6 and the first pipeline 10 respectively; the first pressurizing element 7 is used for pressurizing the steam separated by the filtering unit 90 and conveying the steam to the first pipeline 10 to dry the material to be dried. And / or, a second pressurizing element 8, two ends of the second pressurizing element 8 being communicated with the second pipeline 6 and the containing space respectively; the second pressurizing element 8 is used for pressurizing the steam separated by the filtering unit 90 and conveying the steam to the containing space to fluidize the material to be dried. Exemplarily, the first pressurizing element and the second pressurizing element can be steam booster pumps.

[0050] In an alternative way, referring to Figure 2 , the material drying system can further comprise: a first collecting unit 91, the first collecting unit 91 being communicated with the filtering unit 90 and the drying unit 1 to collect the dried material, thereby facilitating the later use of the collected dried material. Exemplarily, the first collecting unit can be a storage tank, a storage container or the like, as long as the actual needs are met.

[0051] Further, referring to Figure 2 , the first collecting unit 91 is communicated with the steam generating unit 2 through a pipeline provided with a feeding element 92, to provide the steam generating unit 2 with the dried material for heating water. In this case, the steam generating unit 2 heats water using the heat generated by the combustion of the obtained dried material to form hot water steam, and then uses the hot water steam to dry and fluidize the material to be dried in the containing space of the first container 11 to obtain dried material. In this process, the heat self-balancing of the entire material drying system is achieved. Exemplarily, the feeding element can be a feeding fan.

[0052] As a possible implementation, referring to Figure 2 , the material drying system can further comprise: a second collecting unit 93 and a circulating pump 94. The second collecting unit 93 is communicated with the first pipeline 10 to collect the steam and / or liquid water after drying the material to be dried, thereby facilitating the later use of the collected steam and / or liquid water and realizing the recycling of water resources. Exemplarily, the second collecting unit can be a storage water tank, a storage water container or the like, as long as the actual needs are met.

[0053] Further, referring to Figure 2 , two ends of the circulating pump 94 are communicated with the second collecting unit 93 and the steam generating unit 2 respectively, and the steam and / or liquid water in the second collecting unit 93 is transmitted to the steam generating unit 2 through the circulating pump 94. In this case, the steam and / or liquid water obtained by drying the material to be dried is transmitted to the steam generating unit 2 as the required raw material for drying, which not only realizes the recycling of water resources, but also reduces the additional water supply to the steam generating unit 2 and reduces the drying cost.

[0054] In an alternative, the material drying system can further comprise a preheating unit. Referring to Figure 3 , the preheating unit 95 comprises a third pipe 950 and a second container 951 having a containing cavity for containing the material to be dried, and the third pipe 950 is arranged in cooperation with the second container 951.

[0055] The relative position relationship between the third pipe and the second container comprised by the preheating unit can be arranged according to actual needs. For example, the third pipe 950 can be arranged in the containing cavity of the second container 951; or the third pipe is arranged on the outer wall of the second container, and in this case, the third pipe is located outside the containing cavity; or when the wall of the second container is a double-layer structure, the third pipe is arranged in the interlayer of the wall, and in this case, the third pipe is located outside the containing cavity.

[0056] The arrangement of the third pipe is not limited here, and can be arranged in a zigzag, serpentine or linear manner, etc.

[0057] The specific structure and material of the third pipe and the second container are not limited here, and as long as they do not react with the material and ensure normal drying.

[0058] It should be noted that, referring to Figure 3 , when the material drying system further comprises the feeding unit 5, the feeding unit 5 is in communication with the containing cavity of the second container 951, and is used to provide the material to be dried for the preheating unit 95.

[0059] Referring to Figure 3 , the second container 951 is in communication with the first container 11, and the third pipe 950 is in communication with the first pipe 10, so as to transmit the steam and / or liquid water in the first pipe 10 into the third pipe 950, so as to pre-dry the material to be dried in the containing cavity. In this case, since the steam in the first pipe 10 still has a certain temperature after the single drying of the material to be dried by the drying unit 1 is completed, the preheating unit 95 can use the steam from the drying unit 1 and having a certain temperature to pre-dry the material to be dried in the containing cavity. In this case, not only the drying time of the subsequent material to be dried in the drying unit 1 can be shortened, and the drying efficiency can be improved, but also the waste of heat can be reduced, and the resource utilization rate can be improved.

[0060] Further, referring to Figure 3 , the third pipe 950 is in communication with the second collecting unit 93, so as to transmit the steam and / or liquid water in the third pipe 950 into the second collecting unit 93, and in this case, the utilization rate of water resources can be improved.

[0061] In some other embodiments, a third pipe 950 can be arranged to directly communicate with the steam generating unit 2, in which case the third pipe 950 and the first pipe 10 are in parallel, so that a higher temperature can be used to preheat the material to be dried.

[0062] In combination with the foregoing description, the following describes the setting of different structural temperature parameters in the actual working process of the material drying system. It should be noted that the following description is for understanding only and is not used for specific definition.

[0063] In actual drying, the drying temperature in the drying unit is greater than or equal to 110°C and less than or equal to 200°C. For example, the drying temperature can be 110°C, 113°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, or 200°C, etc. At this time, it can be ensured that the material to be dried only undergoes dehydration reaction, and does not undergo devolatilization and pyrolysis reaction, so as to improve the probability of obtaining pure water. Preferably, the drying temperature in the drying unit is 113°C.

[0064] Further, the temperature of the steam after being pressurized by the first pressurizing element is greater than the temperature of the mixture; and / or, the temperature of the steam after being pressurized by the second pressurizing element is greater than the temperature of the mixture.

[0065] For example, the temperature of the steam after being pressurized by the first pressurizing element is greater than or equal to 130°C and less than or equal to 200°C, and the pressure of the steam after being pressurized by the first pressurizing element is greater than or equal to 3.0 bar and less than or equal to 5.0 bar. For example, the temperature of the steam after being pressurized by the first pressurizing element can be 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, or 200°C, etc., and the pressure of the steam after being pressurized by the first pressurizing element can be 3.0 bar, 3.5 bar, 4.0 bar, 4.5 bar, or 5.0 bar, etc.

[0066] The temperature of the steam after being pressurized by the second pressurizing element is greater than or equal to 130°C and less than or equal to 200°C, and the pressure of the steam after being pressurized by the second pressurizing element is greater than or equal to 1.5 bar and less than or equal to 3 bar. For example, the temperature of the steam after being pressurized by the second pressurizing element can be 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, or 200°C, etc., and the pressure of the steam after being pressurized by the second pressurizing element can be 1.5 bar, 1.7 bar, 2 bar, 2.3 bar, 2.5 bar, 2.8 bar, or 3.0 bar, etc.

[0067] Preferably, the mixture outputted from the drying unit has a temperature of 113°C and a pressure of 1.1 bar, and the mixture is separated into steam and a small amount of dried material carried by the steam after being processed by the filtering unit. The steam is divided into two parts, one of which is pressurized by the first pressurizing element and then lifted to steam with a pressure of 3.2 bar and a temperature of 136°C, and the other of which is pressurized by the second pressurizing element and then lifted to steam with a pressure of 1.5 bar and a temperature of 152°C.

[0068] It should be noted that the above-mentioned temperature and pressure parameters are related to the actual material humidity, processing scale, and material density, and the drying parameters need to be further determined according to the specific material type.

[0069] The following describes the specific working process of the material drying system in a possible case. It should be noted that the following description is only for understanding and is not used for specific definition.

[0070] Referring to Figure 3 , the feeding unit 5 is provided with the material to be dried, and the feeding unit 5 is opened to make the material to be dried enter the accommodating cavity of the preheating unit 95. If the third pipeline 950 included in the preheating unit 95 has “steam and / or liquid water with a certain amount of heat”, the material to be dried in the accommodating cavity is pre-dried by using “steam and / or liquid water with a certain amount of heat”. If the third pipeline 950 included in the preheating unit does not have “steam and / or liquid water with a certain amount of heat”, the material to be dried is transmitted to the accommodating space of the drying unit 1 through the pipeline.

[0071] At the same time, the steam generating unit 2 is started, and the steam generating unit 2 is used to heat water to form steam with a temperature meeting the actual requirements. The steam enters the first pipeline 10 through the fourth pipeline 3 for drying the material to be dried. In this process, the drying temperature in the drying unit 1 is maintained at 113°C to ensure that only dehydration reaction occurs in the material to be dried, and no devolatilization and pyrolysis reactions occur.

[0072] In the process of drying the material to be dried in the drying unit 1, the mixture (including steam and a small amount of dried material carried out by the steam) is output from the drying unit 1 to the filtering unit 90. The temperature of the mixture is 113°C and the pressure is 1.1 bar. The mixture is separated by the filtering unit 90 to obtain steam and a small amount of dried material carried out by the steam. Then, the steam is divided into two parts. One part is pressurized by the first pressurizing element 7 to become steam with a pressure of 3.2 bar and a temperature of 136°C. This part of the steam enters the first pipe 10 through the fourth pipe 3 and is used to dry the material to be dried. The other part is pressurized by the second pressurizing element 8 to become steam with a pressure of 1.5 bar and a temperature of 152°C. This part of the steam is used to fluidize the material to be dried and / or the semi-dried material in the containing space to improve the uniformity of heat exchange of the material to be dried and / or the semi-dried material, thereby improving the drying efficiency of the material to be dried. The dried material is discharged from the lower end of the drying unit 1 and the filtering unit 90 and enters the first collecting unit 91.

[0073] When the drying unit 1 ends the single drying of the material to be dried, the steam in the first pipe 10 still has a certain temperature. Therefore, the preheating unit 95 can use the steam from the drying unit 1 and having a certain temperature to pre-dry the material to be dried in the containing cavity. When the pre-drying ends (for example, after the single pre-drying ends), the steam and / or liquid water in the third pipe 950 is transferred to the second collecting unit 93. During the transfer process, the heat of the steam and / or liquid water is continuously lost, and the temperature continuously decreases. At this time, the steam and / or liquid water is cooled to liquid water, which is stored in the second collecting unit 93. It should be noted that the liquid water stored in the second collecting unit 93 is pure water after being separated by the filtering unit 90. Further, the drying time (or the number of drying times) of the drying unit 1 for the same batch of material to be dried is not specifically limited here and can be set according to actual conditions.

[0074] Then, part of the liquid water stored in the second collecting unit 93 is transferred to the steam generating unit 2 by the circulating pump 94. Part of the dried material stored in the first collecting unit 91 is transferred to the steam generating unit 2 by the feeding element 92 to generate heat by combustion. The generated heat converts the liquid water in the steam generating unit 2 into steam. The remaining dried material in the first collecting unit 91 is used for other processes, and the remaining liquid water in the second collecting unit 93 is used for other purposes.

[0075] In summary, the material drying system provided by the embodiments of the present application can be suitable for different materials. Specifically, the material drying system can be suitable for different types of biomass. Moreover, for different moisture contents of different biomass, the flow of steam in the non-contact drying and the contact fluidization can be adjusted to match the drying requirements of the biomass. In addition, the material drying system provided by the embodiments of the present application no longer uses a spiral dryer, and therefore, there is no problem of the spiral dryer consuming a large amount of power during operation, the wear of the spiral dryer affecting the service life thereof, and the spiral pipeline conveying the biomass leading to uneven heating of the biomass. Furthermore, the drying method provided by the embodiments of the present application finally obtains pure water, and at this time, not only can the pure water be used twice, but also a series of problems caused by the need to treat wastewater can be avoided.

[0076] In a second aspect, the embodiments of the present application further provide a processing device, which comprises the material drying system described in the above technical solution.

[0077] The processing device provided by the embodiments of the present application has the same beneficial effects as the material drying system described in the above technical solution, and details are not described herein.

[0078] As a possible implementation manner, the processing device is a biomass gasification device.

[0079] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0080] The above is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A material drying system, characterized in that, include: A drying unit, the drying unit including a first pipe and a first container having a receiving space, the first pipe being configured to cooperate with the first container, the receiving space being used to hold the material to be dried; A steam generating unit is used to heat water to generate steam; The steam generating unit is connected to the first pipeline, and the steam generating unit is used to supply steam to the first pipeline to dry the material to be dried. The steam generating unit is connected to the containing space and is used to supply steam to the containing space to fluidize the material to be dried located in the containing space.

2. The material drying system according to claim 1, characterized in that, The material drying system also includes: The second pipe has a first end connected to the receiving space and a second end connected to the first pipe and / or the receiving space.

3. The material drying system according to claim 2, characterized in that, The material drying system further includes a filter unit installed on the second pipe for separating the mixture to obtain steam and a small amount of dried material carried out by the steam.

4. The material drying system according to claim 3, characterized in that, The material drying system also includes: A first pressurizing element has its two ends connected to the second pipe and the first pipe, respectively; the first pressurizing element is used to pressurize the steam separated by the filtration unit and deliver it to the first pipe to dry the material to be dried; And / or, a second pressurizing element, the two ends of which are respectively connected to the second pipe and the containment space; the second pressurizing element is used to pressurize the steam separated by the filter unit and deliver it to the containment space to fluidize the material to be dried.

5. The material drying system according to claim 3, characterized in that, The material drying system further includes a first collection unit, which is connected to the filtration unit and the drying unit for collecting dried material.

6. The material drying system according to claim 5, characterized in that, The first collection unit is connected to the steam generating unit through a pipeline equipped with a feed element, and is used to provide the dried material to the steam generating unit for heating water.

7. The material drying system according to any one of claims 1-6, characterized in that, The material drying system also includes: The second collection unit is connected to the first pipeline and is used to collect the steam and / or liquid water after drying the material to be dried; A circulating pump is provided, with its two ends connected to the second collection unit and the steam generating unit, respectively; steam and / or liquid water in the second collection unit are transferred to the steam generating unit through the circulating pump.

8. The material drying system according to claim 7, characterized in that, The material drying system also includes: A preheating unit, comprising a third pipe and a second container having a receiving cavity, wherein the third pipe is configured to cooperate with the second container and the receiving cavity is used to contain the material to be dried; The third pipe is connected to the first pipe to transfer steam and / or liquid water located in the first pipe to the third pipe for pre-drying the material to be dried located in the receiving cavity; The third pipe is connected to the second collection unit for transferring steam and / or liquid water located in the third pipe to the second collection unit.

9. A processing equipment, characterized in that, include: The material drying system according to any one of claims 1 to 8.

10. The processing equipment according to claim 9, characterized in that, The processing equipment is a biomass gasification device.

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