CN111750659A - Waste heat recycling drying system and drying method - Google Patents
Waste heat recycling drying system and drying method Download PDFInfo
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- CN111750659A CN111750659A CN202010771491.5A CN202010771491A CN111750659A CN 111750659 A CN111750659 A CN 111750659A CN 202010771491 A CN202010771491 A CN 202010771491A CN 111750659 A CN111750659 A CN 111750659A
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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
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/06—Grains, e.g. cereals, wheat, rice, corn
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a waste heat recycling drying system, which comprises a plurality of drying furnaces for drying step by step, wherein each drying furnace is correspondingly provided with a heat supply gas device; the gas discharged by the drying furnace of the next stage is conveyed into the drying furnace of the previous stage adjacent to the drying furnace; and the gas discharged by the first-stage drying furnace exchanges heat with the outside air, and the outside air after heat exchange is respectively conveyed to the heat supply devices except the first-stage drying furnace. Has the advantages of reasonable layout, high energy utilization rate, high drying efficiency, good drying effect and the like.
Description
The technical field is as follows:
the invention relates to the technical field of agricultural product drying equipment, in particular to a waste heat recycling drying system and a waste heat recycling drying method.
Background art:
grain storage is a material storage system established for guaranteeing the grain consumption demand of non-agricultural population, adjusting the balance of the provincial grain supply and demand, stabilizing the grain market price and coping with serious natural disasters or other emergencies. The grain storage is an economical and practical mode at present, and agricultural products such as garlic, potatoes, corns and the like are suitable for drying and storing.
The agricultural product drying and storing capacity mainly depends on the performance of the drying equipment, however, the existing drying equipment also generally has the defects of high energy consumption, high cost, pollutant emission, poor adaptability to climate and agricultural product types and the like, and as shown in fig. 2, the drying machine is the most representative type, and the main working principle is that a fan sends air into an air heating furnace for heating, then the heated air is sent into the drying furnace for drying the agricultural product, and the dried air is directly discharged into the air. The air exhausted from the drying oven in this kind of dryer contains a lot of heat, resulting in low energy utilization rate and energy waste, and the energy consumption is increased correspondingly in order to improve the drying efficiency and effect. Therefore, there is a need for improvement of the existing drying apparatus, which can improve the energy utilization rate and achieve the purpose of fast drying.
The above description is included in the technical recognition scope of the inventors, and does not necessarily constitute the prior art.
The invention content is as follows:
the invention aims to solve the problems in the prior art and provides a waste heat recycling drying system and a waste heat recycling drying method, and the waste heat recycling drying system and the waste heat recycling drying method have the advantages of reasonable layout, high energy utilization rate, high drying efficiency, good drying effect and the like.
The invention adopts the following technical scheme to realize the purpose:
waste heat recycling drying system includes:
the drying furnaces are used for drying step by step, and each drying furnace is correspondingly provided with a heat supply gas device;
the gas discharged by the drying furnace of the next stage is conveyed into the drying furnace of the previous stage adjacent to the drying furnace;
and the gas discharged by the first-stage drying furnace exchanges heat with the outside air, and the outside air after heat exchange is respectively conveyed to the heat supply devices except the first-stage drying furnace.
The drying furnace is equipped with two for earlier dry be the one-level drying furnace, another be the second grade drying furnace, the one-level drying furnace corresponds and is equipped with one-level heat supply gas device, the second grade drying furnace corresponds and is equipped with second grade heat supply gas device.
The secondary drying furnace is provided with a waste heat exhaust port B, the primary drying furnace is provided with a waste heat air inlet, and a primary waste heat utilization pipe is connected between the waste heat exhaust port B and the waste heat air inlet.
The primary drying furnace is provided with a waste heat exhaust port A, the waste heat exhaust port A is connected with one inlet of the heat exchanger through a secondary waste heat utilization pipe, the other inlet of the heat exchanger is connected with the outside air, and the outlet of the heat exchanger corresponding to the outside air is connected with the secondary heat supply gas device through a pipeline.
And a waste heat fan is arranged on the secondary waste heat utilization pipe.
The primary hot gas supply device comprises a circulating gas pump and a primary air heating furnace, the inlet of the circulating gas pump is connected with the circulating gas outlet on the primary drying furnace through a pipeline, the outlet of the circulating gas pump is connected with the primary air heating furnace through a pipeline, and the primary air heating furnace is connected with the circulating gas inlet on the primary drying furnace through a pipeline.
The second grade heat supply gas device includes air exhauster and second grade air heating furnace, the air exhauster with the exit linkage of heat exchanger, the air exhauster pass through the pipeline with second grade air heating furnace connects, second grade air heating furnace pass through the pipeline with the air inlet of second grade drying furnace is connected.
The drying method comprises the following steps:
(1) carrying out multi-stage drying on agricultural products, wherein each stage of drying independently supplies hot air;
(2) the gas discharged by the latter stage drying is reused for the adjacent former stage drying;
(3) and the gas discharged by the first-stage drying is subjected to heat exchange with the external air, and the external air after heat exchange is reheated and then respectively supplies dry hot gas to the other stages of drying except the first-stage drying.
By adopting the structure, the invention can bring the following beneficial effects:
through designing multistage drying furnace, preferably two-stage drying furnace, the gaseous waste heat with each drying furnace emission simultaneously recycles, and then avoid the waste that the direct emission of waste heat caused, the two-stage drying furnace of this application can realize two-stage waste heat utilization, the one-level is that the waste heat that the following drying furnace produced recycles for preceding one-level drying furnace, and the waste heat that the first level produced preheats the outside air that needs the heating, this design is showing the utilization ratio that improves the waste heat, it is extravagant to reduce the energy, therefore, the production cost is reduced, thereby be favorable to promoting and applying.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a waste heat utilization drying system according to the present invention;
FIG. 2 is a schematic view of a conventional dryer according to the present invention;
in the figure, 1, a primary drying furnace, 2, a secondary drying furnace, 3, a primary hot gas supply device, 301, a circulating air pump, 302, a primary air heating furnace, 4, a secondary hot gas supply device, 401, an exhaust fan, 402, a secondary air heating furnace, 5, a waste heat exhaust port B, 6, a waste heat air inlet, 7, a primary waste heat utilization pipe, 8, a waste heat exhaust port A, 9, a secondary waste heat utilization pipe, 10, a heat exchanger, 11, a circulating gas outlet, 12, a circulating gas inlet, 13, an air inlet, 14, a conveying belt, 15, a waste heat fan, 16, a fan, 17, an air heating furnace, 18 and a drying furnace.
The specific implementation mode is as follows:
in order to more clearly explain the overall concept of the invention, the following detailed description is given by way of example in conjunction with the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
Furthermore, the terms "progressive," "a," "B," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the location of the indicated technical feature.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the waste heat recycling drying system includes:
the drying furnaces are used for drying step by step, and each drying furnace is correspondingly provided with a heat supply gas device;
the gas discharged by the drying furnace of the next stage is conveyed into the drying furnace of the previous stage adjacent to the drying furnace;
and the gas discharged by the first-stage drying furnace exchanges heat with the outside air, and the outside air after heat exchange is respectively conveyed to the heat supply devices except the first-stage drying furnace. Through designing multistage drying furnace, preferably two-stage drying furnace, the gaseous waste heat with each drying furnace emission simultaneously recycles, and then avoid the waste that the direct emission of waste heat caused, the two-stage drying furnace of this application can realize two-stage waste heat utilization, the one-level is that the waste heat that the following drying furnace produced recycles for preceding one-level drying furnace, and the waste heat that the first level produced preheats the outside air that needs the heating, only adopt fan 16 with current drying-machine, the scheme of an air heating furnace 17 and a desiccator 18 is compared, the utilization ratio of waste heat is showing to be improved in this design, it is extravagant to reduce the energy, thereby reduce cost, thereby be favorable to promoting and using.
The drying furnace is equipped with two for earlier dry be one-level drying furnace 1, another be second grade drying furnace 2, one-level drying furnace 1 corresponds and is equipped with one-level heat supply steam device 3, second grade drying furnace 2 corresponds and is equipped with second grade heat supply steam device 4. The two-stage drying is an ideal drying mode at present, and has the advantages of high utilization rate of the whole waste heat, low energy consumption and low operation cost.
The secondary drying furnace 2 is provided with a waste heat exhaust port B5, the primary drying furnace 1 is provided with a waste heat air inlet 6, and a primary waste heat utilization pipe 7 is connected between the waste heat exhaust port B5 and the waste heat air inlet 6. Realize one-level waste heat utilization, help carrying out the effect of auxiliary heating to primary drying.
Be equipped with waste heat gas vent A8 on the primary drying furnace 1, waste heat gas vent A8 passes through second grade waste heat utilization pipe 9 and is connected with an entry of heat exchanger 10, another entry of heat exchanger 10 is connected with the outside air, the export that heat exchanger 10 corresponds the outside air passes through the pipeline and is connected with second grade heat supply gas device 4. The waste heat that produces the one-level drying furnace is recycled, realizes second grade waste heat utilization, and this waste heat is used for preheating to the outside air, and then reduces the required energy consumption of air heating.
And a waste heat fan 15 is arranged on the secondary waste heat utilization pipe 9.
The first-stage hot gas supply device 3 comprises a circulating gas pump 301 and a first-stage air heating furnace 302, an inlet of the circulating gas pump 301 is connected with a circulating gas outlet 11 on the first-stage drying furnace 1 through a pipeline, an outlet of the circulating gas pump 301 is connected with the first-stage air heating furnace 302 through a pipeline, and the first-stage air heating furnace 302 is connected with a circulating gas inlet 12 on the first-stage drying furnace 1 through a pipeline. The three-stage utilization of the waste heat is realized, the gas discharged by the primary drying furnace 1 is directly reheated and recycled, and the energy is further saved.
Second grade supplies hot gas device 4 to include air exhauster 401 and second grade air heating furnace 402, air exhauster 401 with correspond the exit linkage of outside air on the heat exchanger 10, air exhauster 401 through the pipeline with second grade air heating furnace 402 is connected, second grade air heating furnace 402 through the pipeline with second grade drying furnace 2's air inlet 13 is connected. The preheated air is used for reheating and then is sent to the secondary drying furnace 2 for drying.
The drying method comprises the following steps:
(1) carrying out multi-stage drying on agricultural products, wherein each stage of drying independently supplies hot air;
(2) the gas discharged by the latter stage drying is reused for the adjacent former stage drying;
(3) and the gas discharged by the first-stage drying is subjected to heat exchange with the external air, and the external air after heat exchange is reheated and then respectively supplies dry hot gas to the other stages of drying except the first-stage drying.
The working process of the waste heat recycling and drying system comprises the following steps:
when in use, agricultural products (garlic and garlic slices are dried for example) to be dried are conveyed into a primary drying furnace 1 and a secondary drying furnace 2 through a conveying belt 14 (which can be a chain conveying belt and can resist high temperature), firstly, the primary air heating furnace 302 sends heated circulating air into the primary drying furnace 1 to pre-dry garlic slices, meanwhile, air (containing waste heat) discharged from the secondary drying furnace 2 enters the primary drying furnace 1 to pre-dry garlic slices to play a role in auxiliary drying, after the primary drying, the conveying belt 14 sends garlic slices into the secondary drying furnace 2, the secondary air heating furnace 402 sends the heated external air into the secondary drying furnace 2 to deeply dry garlic slices to meet the drying requirement, and meanwhile, the air (containing waste heat) discharged from the primary drying furnace 1 enters a heat exchanger 10 (which can adopt a tubular heat exchanger) to preheat the external air, the outside air after preheating is carried for second grade air heating furnace 402 through air exhauster 401, repeats above-mentioned step and can realize constantly drying to the garlic piece continuously. The traditional dryer only utilizes the heated gas once, and the gas is discharged once when the agricultural products in the drying furnace are dried, and the discharged gas also contains huge heat energy, so that the energy and the resource are wasted due to direct discharge. The drying system recycles the high-temperature gas directly discharged originally, makes full use of heat energy, reduces heating energy consumption, and achieves the purposes of energy conservation and emission reduction. Taking the dried garlic slices as an example, under the conditions that the atmospheric temperature is 28 ℃, the relative humidity is 68% and the absolutely dry material yield is 0.5kg/s, the heat energy utilization rate of the drying system is 63.4%, while the heat energy utilization rate of the traditional dryer is only 36.3%. For cost savings: taking the dried garlic slices as an example, the yield of the oven-dried material is 0.5kg/s, the garlic slices are dried from the water content of 60% to the water content of 5%, considering the coal heating on the common industrial drying, the reference data shows that the heat value of the standard coal is 29307.6kJ/kg, the efficiency of the common heating furnace is 85%, the calculated coal consumption is 417.4kg/h (2888.4 3600)/(0.85 29307.6), the conversion is required to be 584.6kg/h, the price of the raw coal is 350 yuan per ton (0.35 yuan/kg), namely about 205 yuan per hour. The coal consumption during the traditional heating is about (5126.1 x 3600)/(0.85 x 29307.6) ═ 740.8 kg/h; converted into raw coal, 1037.5kg/h, and about 363 yuan is consumed per hour. The comparison can save about 43.5% of fuel cost. The drying system of this application carries out make full use of to the waste heat, is showing reduction energy consumption, reduces the stoving cost, helps extensive popularization and application.
The above-described embodiments should not be construed as limiting the scope of the invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (8)
1. Waste heat recycling drying system, its characterized in that includes:
the drying furnaces are used for drying step by step, and each drying furnace is correspondingly provided with a heat supply gas device;
the gas discharged by the drying furnace of the next stage is conveyed into the drying furnace of the previous stage adjacent to the drying furnace;
and the gas discharged by the first-stage drying furnace exchanges heat with the outside air, and the outside air after heat exchange is respectively conveyed to the heat supply devices except the first-stage drying furnace.
2. The waste heat recycling drying system of claim 1, wherein two drying furnaces are provided, one drying furnace is used for drying first, and the other drying furnace is used for drying second, the primary drying furnace is correspondingly provided with a primary heat supply device, and the secondary drying furnace is correspondingly provided with a secondary heat supply device.
3. The waste heat recycling drying system according to claim 1 or 2, wherein the secondary drying furnace is provided with a waste heat exhaust port B, the primary drying furnace is provided with a waste heat air inlet, and a primary waste heat utilization pipe is connected between the waste heat exhaust port B and the waste heat air inlet.
4. The waste heat recycling drying system of claim 3, wherein the primary drying furnace is provided with a waste heat exhaust port A, the waste heat exhaust port A is connected with one inlet of the heat exchanger through a secondary waste heat utilization pipe, the other inlet of the heat exchanger is connected with the outside air, and the outlet of the heat exchanger corresponding to the outside air is connected with the secondary heat supply air device through a pipeline.
5. The waste heat recycling drying system of claim 4, wherein the secondary waste heat utilization pipe is provided with a waste heat fan.
6. The waste heat recycling drying system according to claim 2 or 5, wherein the primary heat supply device comprises a circulating air pump and a primary air heating furnace, an inlet of the circulating air pump is connected with a circulating air outlet on the primary drying furnace through a pipeline, an outlet of the circulating air pump is connected with the primary air heating furnace through a pipeline, and the primary air heating furnace is connected with a circulating air inlet on the primary drying furnace through a pipeline.
7. The waste heat recycling drying system of claim 2, wherein the secondary heat supply device comprises an exhaust fan and a secondary air heating furnace, the exhaust fan is connected with an outlet of the heat exchanger, the exhaust fan is connected with the secondary air heating furnace through a pipeline, and the secondary air heating furnace is connected with an air inlet of the secondary drying furnace through a pipeline.
8. The drying method is characterized by comprising the following steps:
(1) carrying out multi-stage drying on agricultural products, wherein each stage of drying independently supplies hot air;
(2) the gas discharged by the latter stage drying is reused for the adjacent former stage drying;
(3) and the gas discharged by the first-stage drying is subjected to heat exchange with the external air, and the external air after heat exchange is reheated and then respectively supplies dry hot gas to the other stages of drying except the first-stage drying.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010771491.5A CN111750659A (en) | 2020-08-04 | 2020-08-04 | Waste heat recycling drying system and drying method |
| PCT/CN2020/119989 WO2022027813A1 (en) | 2020-08-04 | 2020-10-09 | Drying system capable of waste heat reuse and drying method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010771491.5A CN111750659A (en) | 2020-08-04 | 2020-08-04 | Waste heat recycling drying system and drying method |
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| CN111750659A true CN111750659A (en) | 2020-10-09 |
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| CN202010771491.5A Pending CN111750659A (en) | 2020-08-04 | 2020-08-04 | Waste heat recycling drying system and drying method |
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| WO (1) | WO2022027813A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113418367A (en) * | 2021-06-21 | 2021-09-21 | 华中科技大学 | Chain drying-machine based on multistage circulation |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873937B (en) * | 2022-04-20 | 2023-03-24 | 中建材创新科技研究院有限公司 | Powder calcining system, plate drying system and hot air system |
| CN115875950B (en) * | 2022-11-03 | 2023-09-05 | 江苏纵横浓缩干燥设备有限公司 | Waste heat recovery equipment and waste heat recovery method for tube bundle dryer |
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| CN113418367B (en) * | 2021-06-21 | 2022-07-19 | 华中科技大学 | Chain drying-machine based on multistage circulation |
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| WO2022027813A1 (en) | 2022-02-10 |
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