WO2022027813A1 - 余热再利用烘干系统及烘干方法 - Google Patents

余热再利用烘干系统及烘干方法 Download PDF

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WO2022027813A1
WO2022027813A1 PCT/CN2020/119989 CN2020119989W WO2022027813A1 WO 2022027813 A1 WO2022027813 A1 WO 2022027813A1 CN 2020119989 W CN2020119989 W CN 2020119989W WO 2022027813 A1 WO2022027813 A1 WO 2022027813A1
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drying
waste heat
furnace
air
primary
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PCT/CN2020/119989
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English (en)
French (fr)
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辛丽
侯少丽
辛磊
李忠元
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山东省玛丽亚农业机械股份有限公司
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Publication of WO2022027813A1 publication Critical patent/WO2022027813A1/zh

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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
    • 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
    • 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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  • the invention relates to the technical field of agricultural product drying equipment, in particular to a waste heat recycling drying system and a drying method.
  • Grain reserve is a material reserve system established to ensure the grain consumption demand of the non-agricultural population, adjust the balance of grain supply and demand in the province, stabilize grain market prices, and respond to major natural disasters or other emergencies. Drying storage is a relatively economical and practical way of grain storage at present. Agricultural products such as garlic, potatoes and corn are more suitable for drying and storage.
  • FIG. 2 shows the most representative type of dryer. Its main working principle is that the air is sent into the air heating furnace by the fan for heating, and then the heated air is sent into the drying furnace to dry the agricultural products. , the dried air is directly discharged into the air.
  • the air discharged from the drying furnace in this type of dryer contains a lot of heat, resulting in a low energy utilization rate and waste of energy. In order to improve the drying efficiency and effect, the energy consumption will also increase accordingly. Therefore, it is necessary to improve the existing drying equipment to achieve the purpose of fast drying while improving the energy utilization rate.
  • the purpose of the present invention is to solve the problems existing in the prior art, and to provide a waste heat reuse drying system and a drying method, which have the advantages of reasonable layout, high energy utilization rate, high drying efficiency and good drying effect.
  • the present invention realizes above-mentioned purpose by adopting following technical scheme:
  • Waste heat reuse drying system including:
  • each drying furnace is correspondingly provided with a heating gas supply device; the gas discharged from the drying furnace of the latter stage is transported to the drying furnace of the adjacent previous stage; The gas discharged from the first-stage drying furnace exchanges heat with the outside air, and the heat-exchanged outside air is respectively delivered to each of the heat supply devices except the first-stage drying furnace.
  • the drying furnace is provided with two, the first drying furnace is a primary drying furnace, and the other is a secondary drying furnace.
  • the primary drying furnace is provided with a primary heating gas supply device, and the secondary drying furnace corresponds to Equipped with secondary heating system.
  • the secondary drying furnace is provided with a waste heat exhaust port B
  • the primary drying furnace is provided with a waste heat inlet
  • a primary waste heat utilization pipe is connected between the waste heat exhaust port B and the waste heat inlet .
  • the primary drying furnace is provided with a waste heat exhaust port A, the waste heat exhaust port A is connected to an inlet of the heat exchanger through a secondary waste heat utilization pipe, and the other inlet of the heat exchanger is connected to the outside air, The outlet of the heat exchanger corresponding to the outside air is connected to the secondary heat supply device through a pipeline.
  • the secondary waste heat utilization pipe is provided with a waste heat fan.
  • the primary heat supply device includes a circulating air pump and a primary air heating furnace.
  • the inlet of the circulating air pump is connected to the circulating air outlet on the primary drying furnace through a pipeline, and the outlet of the circulating air pump is connected through a pipeline. It is connected with the primary air heating furnace, and the primary air heating furnace is connected with the circulating gas inlet on the primary drying furnace through pipelines.
  • the secondary heat supply device includes an exhaust fan and a secondary air heating furnace, the exhaust fan is connected to the outlet of the heat exchanger, and the exhaust fan is connected to the secondary air heating furnace through a pipeline, so The secondary air heating furnace is connected to the air inlet of the secondary drying furnace through a pipeline.
  • the drying method includes the following steps:
  • the present invention adopts the above-mentioned structure, and can bring the following beneficial effects:
  • the two-stage drying furnace of the present application can realize two-stage waste heat utilization, one
  • the waste heat generated by the subsequent drying furnace is reused by the previous drying furnace, and the waste heat generated by the first stage preheats the external air that needs to be heated.
  • This design significantly improves the utilization rate of waste heat, reduces energy waste and reduces costs. , which is conducive to promotion and application.
  • Fig. 1 is the structural representation of the waste heat utilization drying system of the present invention
  • Fig. 2 is the structural representation of the existing dryer of the present invention
  • the terms “installed”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or into one; it can be directly connected or indirectly connected through an intermediary.
  • installed e.g., it may be a fixed connection or a detachable connection , or into one; it can be directly connected or indirectly connected through an intermediary.
  • specific meanings of the above terms in the present invention can be understood according to specific situations.
  • the waste heat reuse drying system includes:
  • each drying furnace is correspondingly provided with a heating gas supply device; the gas discharged from the drying furnace of the latter stage is transported to the drying furnace of the adjacent previous stage; The gas discharged from the first-stage drying furnace exchanges heat with the outside air, and the heat-exchanged outside air is respectively delivered to each of the heat supply devices except the first-stage drying furnace.
  • the two-stage drying furnace of the present application can realize two-stage waste heat utilization, one
  • the waste heat generated by the following drying furnace is reused by the previous drying furnace, and the waste heat generated by the first stage preheats the outside air that needs to be heated, and the existing dryer only uses a fan 16, an air heating Compared with the scheme of the furnace 17 and the one dryer 18, this design significantly improves the utilization rate of waste heat, reduces energy waste, and reduces costs, which is beneficial to popularization and application.
  • the drying furnace is provided with two, the first drying furnace 1 is the first drying furnace, and the other is the second drying furnace 2.
  • the first drying furnace 1 is correspondingly provided with a first heating gas supply device 3
  • the secondary drying furnace 2 is correspondingly provided with a secondary heating gas supply device 4 .
  • Two-stage drying is an ideal drying method at present, with high overall waste heat utilization rate, low energy consumption and low operating 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 inlet 6, and a waste heat exhaust port B5 is connected with the waste heat inlet 6.
  • the primary drying furnace 1 is provided with a waste heat exhaust port A8, and the waste heat exhaust port A8 is connected to an inlet of the heat exchanger 10 through a secondary waste heat utilization pipe 9, and the other inlet of the heat exchanger 10 is connected to an inlet of the heat exchanger 10.
  • the external air is connected, and the outlet of the heat exchanger 10 corresponding to the external air is connected to the secondary heat supply device 4 through a pipeline.
  • the waste heat generated by the primary drying furnace is reused to realize the secondary waste heat utilization, and the waste heat is used to preheat the outside air, thereby reducing the energy consumption required for heating the air.
  • the secondary waste heat utilization pipe 9 is provided with a waste heat fan 15 .
  • the primary heat supply device 3 includes a circulating air pump 301 and a primary air heating furnace 302.
  • the inlet of the circulating air pump 301 is connected to the circulating air outlet 11 on the primary drying furnace 1 through a pipeline.
  • the outlet of the air pump 301 is connected to the primary air heating furnace 302 through a pipeline, and the primary air heating furnace 302 is connected to the circulating air inlet 12 of the primary drying furnace 1 through a pipeline.
  • the three-stage utilization of waste heat is realized, and the gas discharged from the first-stage drying furnace 1 is directly reheated and recycled to further save energy.
  • the secondary heat supply device 4 includes an exhaust fan 401 and a secondary air heating furnace 402.
  • the exhaust fan 401 is connected to the outlet of the heat exchanger 10 corresponding to the outside air.
  • the secondary air heating furnace 402 is connected, and the secondary air heating furnace 402 is connected to the air inlet 13 of the secondary drying furnace 2 through a pipeline. After reheating with preheated air, it is dried in the secondary drying furnace 2 .
  • the drying method includes the following steps:
  • the agricultural products to be dried can be transported into the primary drying furnace 1 and the secondary drying furnace 2 through the conveyor belt 14 (which can be a chain conveyor belt, which can be resistant to high temperature).
  • the primary air heating furnace 302 sends the heated circulating air into the primary drying furnace 1 to pre-dry the garlic slices, and at the same time, the air (containing waste heat) discharged from the secondary drying furnace 2 enters the primary drying furnace 1 pair
  • the pre-drying of garlic slices plays the role of auxiliary drying.
  • the conveyor belt 14 sends the garlic slices into the secondary drying furnace 2, and the secondary air heating furnace 402 sends the heated outside air into the secondary drying furnace 2.
  • the garlic slices are deeply dried in the secondary drying furnace 2 to meet the drying requirements.
  • the air (including waste heat) discharged from the primary drying furnace 1 enters the heat exchanger 10 (a tubular heat exchanger can be used) to the outside air.
  • Preheating is performed, and the preheated outside air is transported to the secondary air heating furnace 402 through the exhaust fan 401, and the garlic slices can be continuously dried by repeating the above steps.
  • the traditional dryer only uses the heated gas once, and dries the agricultural products in the drying furnace once to discharge the gas.
  • the discharged gas also contains huge heat energy, and the direct discharge causes a waste of energy and resources.
  • the drying system of the present application reuses the high-temperature gas originally discharged directly, makes full use of thermal energy, reduces heating energy consumption, and achieves the purpose of energy saving and emission reduction.
  • This application takes drying garlic slices as an example. Under the condition that the atmospheric temperature is 28°C, the relative humidity is 68%, and the output of dry material is 0.5kg/s, the thermal energy utilization rate of the drying system of the present application is 63.4 %, while the thermal energy utilization rate of traditional dryers is only 36.3%.
  • the calorific value of standard coal is 29307.6kJ/kg, and the efficiency of the general heating furnace is 85%.
  • a fuel cost saving of approximately 43.5% can be obtained.
  • the drying system of the present application makes full use of waste heat, significantly reduces energy consumption, reduces drying cost, and is helpful for wide popularization and application.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

一种余热再利用烘干系统，包括用于逐级干燥的多个干燥炉（1,2），每个干燥炉（1,2）对应设有一供热气装置（3,4）；后一级干燥炉（2）排放的气体输送给与其相邻的前一级干燥炉（1）内；第一级干燥炉（1）排放的气体与外界空气换热，换热后的外界空气分别输送给除第一级干燥炉（1）之外的各供热气装置（3,4）。该烘干系统具有布局合理、能源利用率高、烘干效率高和烘干效果好等优点。

Description

余热再利用烘干系统及烘干方法 技术领域
本发明涉及农产品烘干设备技术领域，具体涉及一种余热再利用烘干系统及烘干方法。
背景技术
粮食储备是为保证非农业人口的粮食消费需求，调节省内粮食供求平衡、稳定粮食市场价格、应对重大自然灾害或其他突发事件而建立的一项物资储备制度。烘干储备是目前粮食储备比较经济实用的一种方式，像大蒜、土豆、玉米等农产品都比较适用于烘干收储。
农产品烘干收储能力主要取决于烘干设备的性能，然而现有烘干设备还普遍存在能耗高、成本高、有污染物排放、对气候和农产品种类的适应性差等方面的不足，如图2所示是最具代表性的一类烘干机，其主要工作原理是由风机将空气送入空气加热炉内进行加热，然后将加热后的空气送入干燥炉内对农产品进行烘干，烘干后的空气直接排放到空气中。这类烘干机中的干燥炉排放的空气含有大量的热量，导致能源利用率较低，造成能源的浪费，且为了提高烘干效率和效果能耗也会相应的增加。因此，有必要对现有的烘干设备进行改进，提高能源利用率的同时，还能实现快速烘干的目的。
需要说明的是，上述内容属于发明人的技术认知范畴，并不必然构成现有技术。
发明内容
本发明的目的在于解决现有技术所存在的问题，提供一种余热再利用烘干系统及烘干方法，具有布局合理、能源利用率高、烘干效率高和烘干效果好等优点。
本发明通过采取以下技术方案实现上述目的：
余热再利用烘干系统，包括：
用于逐级干燥的多个干燥炉，每个所述干燥炉对应设有一供热气装置；后一级所述干燥炉排放的气体输送给与其相邻的前一级所述干燥炉内；第一级所述干燥炉排放的气体与外界空气换热，换热后的外界空气分别输送给除第一级所述干燥炉之外的各所述供热气装置。
所述干燥炉设有两个，用于先干燥的为一级干燥炉，另一个为二级干燥炉，所述一级干燥炉对应设有一级供热气装置，所述二级干燥炉对应设有二级供热气装置。
所述二级干燥炉设有余热排气口B，所述一级干燥炉上设有余热进气口，所述余热排气口B与所述余热进气口之间连接有一级余热利用管。
所述一级干燥炉上设有余热排气口A，所述余热排气口A通过二级余热利用管与换热器的一入口连接，所述换热器另一入口与外界空气连接，所述换热器对应外界空气的出口通过管路与二级供热气装置连接。
所述二级余热利用管上设有余热风机。
所述一级供热气装置包括循环气泵和一级空气加热炉，所述循环气泵的进口通过管路与所述一级干燥炉上的循环气出口连接，所述循 环气泵的出口通过管路与所述一级空气加热炉连接，所述一级空气加热炉通过管路与所述一级干燥炉上的循环气进口连接。
所述二级供热气装置包括抽风机和二级空气加热炉，所述抽风机与所述换热器的出口连接，所述抽风机通过管路与所述二级空气加热炉连接，所述二级空气加热炉通过管路与所述二级干燥炉的进气口连接。
烘干方法，包括以下步骤：
(1)对农产品进行多级干燥，每级干燥单独供热气；
(2)后一级干燥排放的气体给与其相邻的前一级干燥再利用；
(3)第一级干燥排放的气体与外界空气进行热交换，换热后的外界空气再加热后分别给除第一级干燥外其余各级干燥供干燥热气。
本发明采用上述结构，能够带来如下有益效果：
通过设计多级干燥炉，优选两级干燥炉，同时将各干燥炉排放的气体余热进行再利用，进而避免余热直接排放造成的浪费，本申请的两级干燥炉可以实现两级余热利用，一级是后面的干燥炉产生的余热给前一级干燥炉再利用，而第一级产生的余热对需要加热的外界空气进行预热，该设计显著提高余热的利用率，减少能源浪费，降低成本，从而有利于推广和应用。
附图说明
图1为本发明余热利用烘干系统的结构示意图；
图2为本发明现有烘干机的结构示意图；
图中，1、一级干燥炉，2、二级干燥炉，3、一级供热气装置，301、 循环气泵，302、一级空气加热炉，4、二级供热气装置，401、抽风机，402、二级空气加热炉，5、余热排气口B，6、余热进气口，7、一级余热利用管，8、余热排气口A，9、二级余热利用管，10、换热器，11、循环气出口，12、循环气进口，13、进气口，14、输送带，15、余热风机，16、风机、17、空气加热炉，18、干燥炉。
具体实施方式
为了更清楚的阐释本发明的整体构思，下面结合说明书附图以示例的方式进行详细说明。
在下面的描述中阐述了很多具体细节以便于充分理解本发明，但是，本发明还可以采用其他不同于在此描述的其他方式来实施，因此，本发明的保护范围并不受下面公开的具体实施例的限制。
本说明书中的各个实施例均采用递进的方式描述，各个实施例之间相同相似的部分互相参见即可，每个实施例重点说明的都是与其他实施例的不同之处。
此外，术语“逐级”、“A”、“B”、等术语仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的位置。
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
如图1所示，余热再利用烘干系统，包括：
用于逐级干燥的多个干燥炉，每个所述干燥炉对应设有一供热气装置；后一级所述干燥炉排放的气体输送给与其相邻的前一级所述干燥炉内；第一级所述干燥炉排放的气体与外界空气换热，换热后的外界空气分别输送给除第一级所述干燥炉之外的各所述供热气装置。通过设计多级干燥炉，优选两级干燥炉，同时将各干燥炉排放的气体余热进行再利用，进而避免余热直接排放造成的浪费，本申请的两级干燥炉可以实现两级余热利用，一级是后面的干燥炉产生的余热给前一级干燥炉再利用，而第一级产生的余热对需要加热的外界空气进行预热，与现有的烘干机只采用风机16、一个空气加热炉17和一个干燥机18的方案相比，该设计显著提高余热的利用率，减少能源浪费，降低成本，从而有利于推广和应用。
所述干燥炉设有两个，用于先干燥的为一级干燥炉1，另一个为二级干燥炉2，所述一级干燥炉1对应设有一级供热气装置3，所述二级干燥炉2对应设有二级供热气装置4。采用两级干燥是目前比较理想的干燥方式，整体余热利用率高、能耗低、运行成本低。
所述二级干燥炉2设有余热排气口B5，所述一级干燥炉1上设有余热进气口6，所述余热排气口B5与所述余热进气口6之间连接有一级余热利用管7。
实现一级余热利用，有助于对初级干燥进行辅助加热的作用。
所述一级干燥炉1上设有余热排气口A8，所述余热排气口A8通过二级余热利用管9与换热器10的一入口连接，所述换热器10另一 入口与外界空气连接，所述换热器10对应外界空气的出口通过管路与二级供热气装置4连接。将一级干燥炉产生的余热进行再利用，实现二级余热利用，该余热用于对外界空气预热，进而降低对空气加热所需的能耗。
所述二级余热利用管9上设有余热风机15。
所述一级供热气装置3包括循环气泵301和一级空气加热炉302，所述循环气泵301的进口通过管路与所述一级干燥炉1上的循环气出口11连接，所述循环气泵301的出口通过管路与所述一级空气加热炉302连接，所述一级空气加热炉302通过管路与所述一级干燥炉1上的循环气进口12连接。实现余热的三级利用，直接对一级干燥炉1排放的气体进行再加热循环利用，进一步节能。
所述二级供热气装置4包括抽风机401和二级空气加热炉402，所述抽风机401与所述换热器10上对应外界空气的出口连接，所述抽风机401通过管路与所述二级空气加热炉402连接，所述二级空气加热炉402通过管路与所述二级干燥炉2的进气口13连接。利用预热后的空气进行再加热后给二级干燥炉2进行干燥。
烘干方法，包括以下步骤：
(1)对农产品进行多级干燥，每级干燥单独供热气；
(2)后一级干燥排放的气体给与其相邻的前一级干燥再利用；
(3)第一级干燥排放的气体与外界空气进行热交换，换热后的外界空气再加热后分别给除第一级干燥外其余各级干燥供干燥热气。
本发明的余热再利用烘干系统的工作过程：
使用时，可以通过输送带14(可以是链条输送带，耐高温的即可)将待干燥的农产品(以大蒜蒜片干燥为例)输送进一级干燥炉1和二级干燥炉2内，首先一级空气加热炉302将加热后的循环空气送入一级干燥炉1内对蒜片进行预烘干，同时从二级干燥炉2排出的空气(含有余热)进入一级干燥炉1对蒜片预烘干起到辅助烘干的作用，经过一级烘干后，输送带14将蒜片送入二级烘干炉2内，二级空气加热炉402将加热后的外界空气送入二级干燥炉2内对蒜片进行深度烘干，达到烘干要求，同时一级干燥炉1排出的空气(含余热)进入换热器10内(可以采用管式换热器)对外界空气进行预加热，预加热后的外界空气通过抽风机401输送给二级空气加热炉402，重复上述步骤即可实现持续不断对蒜片进行烘干。传统烘干机只对加热后的气体进行一次利用，对干燥炉内的农产品烘干一次即排出气体，排出的气体还含有巨大的热能，直接排出造成了能量和资源的浪费。而本申请的烘干系统将原本直接排出的高温气体重新利用，充分利用了热能，减小了加热能耗，达到节能减排的目的。本申请以烘干蒜片为例，在大气温度为28℃，相对湿度为68％的情况，绝干物料产量为0.5kg/s的情况下，本申请的烘干系统的热能利用率为63.4％，而传统烘干机的热能利用率仅为36.3％。对于成本节约而言：还是以烘干蒜片为例，绝干物料产量为0.5kg/s，将其从含水率60％烘干至含水率5％，考虑一般工业干燥上的燃煤加热，查阅资料可知标准煤的热值为29307.6kJ/kg，一般加热炉效率为85％，可算得耗煤量为(2888.4*3600)/(0.85*29307.6)＝417.4kg/h，换算成原煤需要584.6kg/h，原煤价格 以山西为准一般为350元一吨，即0.35元/kg，即每小时大约花费205元。传统加热时耗煤量约为(5126.1*3600)/(0.85*29307.6)＝740.8kg/h；换算成原煤需要1037.5kg/h,每小时大约花费363元。对比可得大约能节省43.5％的燃料开销。本申请的烘干系统对余热进行充分利用，显著降低能耗，降低烘干成本，有助于广泛推广和应用。
上述具体实施方式不能作为对本发明保护范围的限制，对于本技术领域的技术人员来说，对本发明实施方式所做出的任何替代改进或变换均落在本发明的保护范围内。
本发明未详述之处，均为本技术领域技术人员的公知技术。

Claims (8)

  1. 余热再利用烘干系统，其特征在于，包括：用于逐级干燥的多个干燥炉，每个所述干燥炉对应设有一供热气装置；后一级所述干燥炉排放的气体输送给与其相邻的前一级所述干燥炉内；第一级所述干燥炉排放的气体与外界空气换热，换热后的外界空气分别输送给除第一级所述干燥炉之外的各所述供热气装置。
  2. 根据权利要求1所述的余热再利用烘干系统，其特征在于，所述干燥炉设有两个，用于先干燥的为一级干燥炉，另一个为二级干燥炉，所述一级干燥炉对应设有一级供热气装置，所述二级干燥炉对应设有二级供热气装置。
  3. 根据权利要求1或2所述的余热再利用烘干系统，其特征在于，所述二级干燥炉设有余热排气口B，所述一级干燥炉上设有余热进气口，所述余热排气口B与所述余热进气口之间连接有一级余热利用管。
  4. 根据权利要求3所述的余热再利用烘干系统，其特征在于，所述一级干燥炉上设有余热排气口A，所述余热排气口A通过二级余热利用管与换热器的一入口连接，所述换热器另一入口与外界空气连接，所述换热器对应外界空气的出口通过管路与二级供热气装置连接。
  5. 根据权利要求4所述的余热再利用烘干系统，其特征在于，所述二级余热利用管上设有余热风机。
  6. 根据权利要求2或5所述的余热再利用烘干系统，其特征在于，所述一级供热气装置包括循环气泵和一级空气加热炉，所述循环气泵的进口通过管路与所述一级干燥炉上的循环气出口连接，所述循环气 泵的出口通过管路与所述一级空气加热炉连接，所述一级空气加热炉通过管路与所述一级干燥炉上的循环气进口连接。
  7. 根据权利要求2所述的余热再利用烘干系统，其特征在于，所述二级供热气装置包括抽风机和二级空气加热炉，所述抽风机与所述换热器的出口连接，所述抽风机通过管路与所述二级空气加热炉连接，所述二级空气加热炉通过管路与所述二级干燥炉的进气口连接。
  8. 烘干方法，其特征在于，包括以下步骤：
    (1)对农产品进行多级干燥，每级干燥单独供热气；
    (2)后一级干燥排放的气体给与其相邻的前一级干燥再利用；
    (3)第一级干燥排放的气体与外界空气进行热交换，换热后的外界空气再加热后分别给除第一级干燥外其余各级干燥供干燥热气。
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