Agricultural and forestry waste resource utilization system

Abstract

The utility model discloses an agricultural and forestry waste resource utilization system, which relates to the technical field of agricultural and forestry waste treatment and comprises a fluidized bed reactor, a cyclone separator, a primary condensing tower, a secondary condensing tower, a purification tower and a combustion furnace which are sequentially connected and communicated, a flue gas outlet of the combustion furnace is connected and communicated with a gas inlet in the bottom of the fluidized bed reactor through a connecting pipe; and a feeder capable of transporting the forestry and agricultural residues into the fluidized bed reactor is arranged below the stock bin. The agricultural and forestry waste resource utilization system provided by the utility model is wide in application range, efficient, energy-saving, environment-friendly and pollution-free.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural and forestry waste treatment, in particular to an agricultural and forestry waste resource utilization system. Background Art

[0002] With the growing global demand for environmental protection and renewable energy, the resource utilization of agricultural and forestry waste has become an important research topic. Agricultural and forestry waste refers to various wastes generated during agricultural and forestry production, such as crop straw, fruit shells, leaves, and branches. These wastes contain large amounts of organic matter. Effective recycling and utilization can not only reduce environmental pollution but also provide a new source of renewable energy. Pyrolysis is an effective method for treating agricultural and forestry waste, converting biomass into useful energy forms such as pyrolysis oil and gas and pyrolysis charcoal.

[0003] Existing agricultural and forestry waste treatment technologies mainly include physical, chemical and biological methods. Physical methods mainly involve mechanically crushing and compressing waste to reduce its volume and improve its performance. Chemical methods mainly convert waste into useful chemicals through chemical reactions. Biological methods mainly convert waste into biogas or biofertilizer through the action of microorganisms. Although existing agricultural and forestry waste treatment technologies have solved the problem of waste treatment to a certain extent, there are still many problems and shortcomings. First, existing treatment methods can often only treat specific types of waste and are not effective in treating multiple types of waste. Second, existing treatment methods often require high energy consumption, which not only increases treatment costs but also increases environmental pressure. In addition, existing treatment methods may generate secondary pollution during the treatment process, such as waste gas, wastewater, waste residue, etc. Therefore, how to treat agricultural and forestry waste efficiently and environmentally friendly and realize its resource utilization is a problem that needs to be solved urgently. Utility Model Content

[0004] The purpose of this utility model is to provide a system for resource utilization of agricultural and forestry wastes to solve the problems existing in the above-mentioned prior art, which has a wide range of applications, is highly efficient and energy-saving, and is environmentally friendly and pollution-free.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The utility model provides a system for resource utilization of agricultural and forestry wastes, comprising a fluidized bed reactor, a cyclone separator, a primary condensation tower, a secondary condensation tower, a purification tower and a combustion furnace, which are sequentially connected and communicated. The flue gas outlet of the combustion furnace is connected and communicated with the air inlet at the bottom of the fluidized bed reactor through a connecting pipe.

[0007] It also includes a silo, under which a feeder capable of transporting agricultural and forestry wastes to the interior of the fluidized bed reactor is provided.

[0008] Preferably, a gasification blower is provided on the connecting pipe.

[0009] Preferably, a first-level product outlet is provided at the bottom of the first-level condensation tower, a second-level product outlet is provided at the bottom of the first-level condensation tower, and a tower body product outlet is provided at the bottom of the purification tower. The first-level product outlet, the second-level product outlet and the tower body product outlet are all connected and communicated with a collection container.

[0010] Preferably, a natural gas inlet is provided on the combustion furnace.

[0011] Compared with the prior art, the utility model has achieved the following technical effects:

[0012] (1) The agricultural and forestry waste resource utilization system provided by the utility model can process various types of agricultural and forestry waste, such as crop straw, fruit shells, leaves, branches, etc., and has wide applicability;

[0013] (2) The present invention realizes efficient pyrolysis of agricultural and forestry wastes by setting up a fluidized bed reactor and a cyclone separator, greatly improving the treatment efficiency. At the same time, the use of fluidized gas heating avoids the high energy consumption problem in traditional treatment methods, thus achieving the purpose of energy saving;

[0014] (3) In the agricultural and forestry waste resource utilization system provided by the utility model, all products can be effectively utilized during the treatment process, such as pyrolysis oil and pyrolysis charcoal can be used as energy, biochar can be used as a soil conditioner, crude wood vinegar and pure wood vinegar can be used as chemical raw materials. In addition, a two-stage condensation tower is used to ensure the full condensation of pyrolysis gas and avoid the generation of secondary pollution;

[0015] (4) The combustion furnace provided by the present invention is provided with a reserved natural gas inlet, which can be used to supplement the heat when it is insufficient, thereby ensuring the stable operation of the system and increasing the flexibility of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the structure of the agricultural and forestry waste resource utilization system provided by the utility model;

[0018] In the figure: 1- silo; 2- feeder; 3- fluidized bed reactor; 4- cyclone separator; 5- primary condensation tower; 6- secondary condensation tower; 7- purification tower; 8- collection container; 9- combustion furnace; 10- natural gas inlet; 11- gasification fan. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] The purpose of the utility model is to provide a system for resource utilization of agricultural and forestry wastes to solve the problems existing in the prior art, with wide application range, high efficiency, energy saving, environmental protection and no pollution.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0022] The utility model provides a system for resource utilization of agricultural and forestry wastes, such as Figure 1 As shown, in this embodiment, it includes a fluidized bed reactor 3, a cyclone separator 4, a first-level condensation tower 5, a second-level condensation tower 6, a purification tower 7 and a combustion furnace 9 that are connected and communicated in sequence. The flue gas outlet of the combustion furnace 9 is connected and communicated with the air inlet at the bottom of the fluidized bed reactor 3 through a connecting pipe; it also includes a silo 1, and a feeder 2 is provided under the silo 1 for transporting agricultural and forestry waste to the inside of the fluidized bed reactor 3.

[0023] In one embodiment, a gasification blower 11 is provided on the connecting pipe for introducing hot flue gas into the fluidized bed reactor 3 .

[0024] In one embodiment, a first-level product outlet is opened at the bottom of the first-level condensation tower 5, a second-level product outlet is opened at the bottom of the first-level condensation tower 5, and a tower body product outlet is opened at the bottom of the purification tower 7. The first-level product outlet, the second-level product outlet and the tower body product outlet are all connected and communicated with a collection container 8.

[0025] In one embodiment, a natural gas inlet 10 is provided on the combustion furnace 9 for replenishing combustible gas into the combustion furnace 9 .

[0026] The agricultural and forestry waste resource utilization system provided by this utility model has the following operation process:

[0027] 1. First, agricultural and forestry waste (including but not limited to garden waste, straw, and branches) with a moisture content of less than 15% is crushed into fragments of 3 to 5 cm, and then these fragments are transported to the silo 1. This treatment method can effectively improve the efficiency of subsequent treatment and also help reduce energy consumption;

[0028] 2. A feeder 2 is provided at the bottom of the silo 1, and the material is transported to the fluidized bed reactor 3 through the feeder 2. During this process, the material contacts the fluidizing gas from the bottom of the fluidized bed reactor 3, causing fluidization and pyrolysis reactions, converting the biomass particles into a mixture of pyrolysis oil gas and pyrolysis carbon. This treatment method can not only effectively realize the resource utilization of agricultural and forestry waste, but also complete the treatment process in a short time, thereby avoiding secondary pollution;

[0029] 3. The pyrolysis gas produced by the reaction carries the semi-coke particles and is discharged from the top of the fluidized bed reactor 3 and enters the cyclone separator 4. The product separated by the cyclone separator 4 is collected as a biochar product;

[0030] 4. The separated gas enters the primary condensing tower 5 for primary condensation to generate a primary liquid product and a primary pyrolysis gas product. The liquid product is discharged through the primary product outlet and collected in a collecting container 8 as a crude wood vinegar product. The incompletely condensed primary pyrolysis gas continues to enter the secondary condensing tower 6 for secondary condensation to generate a secondary liquid product and a secondary pyrolysis gas. The secondary liquid product is discharged through the secondary product outlet and collected in a collecting container 8 as a crude wood vinegar product. The secondary pyrolysis gas enters the purification tower 7 and enters the combustion furnace 9 as fuel gas after tail gas purification treatment. The outlet temperature of the primary condenser is 80-150°C, and the outlet temperature of the secondary condenser is 40-80°C.

[0031] 5. The secondary pyrolysis gas enters the combustion furnace 9 and burns to generate 800°C hot flue gas, which returns to the fluidized bed reactor 3 and serves as fluidizing gas to provide temperature for the fluidized bed. The combustion furnace 9 has a reserved natural gas inlet 10 to supplement the heat when it is insufficient. This method can not only effectively utilize the heat of the pyrolysis gas, but also ensure the normal operation of the fluidized bed reactor 3.

[0032] The agricultural and forestry waste resource utilization system provided by the utility model is widely applicable: it can process various types of agricultural and forestry waste, such as crop straw, fruit shells, leaves, branches, etc., and has a wide range of applicability;

[0033] High efficiency and energy saving: By setting up the fluidized bed reactor 3 and the cyclone separator 4, efficient pyrolysis of agricultural and forestry waste is achieved, greatly improving the treatment efficiency. At the same time, the use of fluidized gas heating avoids the high energy consumption problem in traditional treatment methods, achieving the purpose of energy saving;

[0034] Environmentally friendly and pollution-free: During the treatment process, all products can be effectively utilized. For example, pyrolysis oil and pyrolysis charcoal can be used as energy, biochar can be used as a soil conditioner, and crude wood vinegar and pure wood vinegar can be used as chemical raw materials. In addition, a two-stage condensation tower 6 is used to ensure the full condensation of pyrolysis gas, avoiding the generation of secondary pollution.

[0035] Flexible adjustment: A natural gas inlet 10 is reserved on the combustion furnace 9, which can be used to supplement the heat when it is insufficient, ensuring the stable operation of the system and increasing the flexibility of the system;

[0036] Resource utilization of agricultural and forestry waste: The system produces three-phase products of gas, liquid and solid, which is a thorough resource utilization approach, converting agricultural and forestry waste into useful energy forms. The generated gas is a combustible gas, and the generated biochar can be used to prepare carbon-based fertilizers, soil improvement, and activated carbon, etc. Wood vinegar products can be used as soil conditioners, plant growth promoters, fungicides, etc., which meets the current social demand for environmental protection and renewable energy, and has broad application prospects.

[0037] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A system for resource utilization of agricultural and forestry waste, characterized by: include: A fluidized bed reactor, a cyclone separator, a primary condensation tower, a secondary condensation tower, a purification tower and a combustion furnace are sequentially connected and communicated; The fluidized bed reactor is used for fluidized pyrolysis reaction and generates pyrolysis carbon and pyrolysis oil and gas; The cyclone separator is used to separate biochar from the pyrolysis oil and gas discharged from the fluidized bed reactor; The primary condensation tower and the secondary condensation tower are used to condense the pyrolysis oil and gas and produce crude wood vinegar; the purification tower is used to purify the pyrolysis oil and gas and produce pure wood vinegar; The flue gas outlet of the combustion furnace is connected and communicated with the air inlet at the bottom of the fluidized bed reactor through a connecting pipe; A gasification blower is provided on the connecting pipe; It also includes a silo, under which a feeder capable of transporting agricultural and forestry wastes to the interior of the fluidized bed reactor is provided.

2. The agricultural and forestry waste resource utilization system according to claim 1, characterized in that: A first-level product outlet is provided at the bottom of the first-level condensation tower, a second-level product outlet is provided at the bottom of the first-level condensation tower, and a tower body product outlet is provided at the bottom of the purification tower. The first-level product outlet, the second-level product outlet and the tower body product outlet are all connected and communicated with a collecting container.

3. The agricultural and forestry waste resource utilization system according to claim 1, characterized in that: A natural gas inlet is provided on the combustion furnace.

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