Device for producing oil by quickly pyrolyzing waste agricultural mulching film

Abstract

The utility model relates to a device for producing oil by quickly pyrolyzing waste agricultural mulching films, which is characterized in that a discharge port of a mulching film crusher is connected with a feed port at the upper end of a feed hopper through a conveying pipe, and the lower end of the feed hopper is vertically and fixedly connected with a feed port on an outer sleeve of a spiral feeding conveyor; one end, far away from the feeding hole, of an outer sleeve of the spiral feeding conveyor is inserted into the middle lower part of the bubbling fluidized bed; the cyclone separator is arranged in the bubbling fluidized bed, the gas discharge end of the cyclone separator is connected with the input end of the first-stage condenser through a heat preservation pipeline, and the output end of the first-stage condenser is connected with the input end of the gas-liquid separator; the fluidizing gas supply system adopts a biomass combustion gas supply system and is connected with a fluidizing gas input port of the bubbling fluidized bed through a gas conveying pipeline, so that flue gas generated by combustion is input as fluidizing gas; and the lower inclined pipeline is connected with a heat storage bed material input interface of the bubbling fluidized bed, so that solid residues generated by combustion are input as heat carriers. According to the device, pyrolysis oil production of the mulching film is realized in an energy-saving and efficient manner.

Description

Technical Field

[0001] The utility model belongs to the field of agricultural waste resource utilization and new energy technology, and specifically relates to a mounting structure of a temperature sensor for a high-pressure liquid heater. Background Art

[0002] Mulching with mulch film is a common measure that can prevent soil erosion and increase crop yields. However, mulch film is ultra-thin and has poor seasonality, which causes the problem of residual mulch film. Long-term mulching and improper recycling will lead to residual film and microplastic pollution in farmland, causing "white pollution" of farmland, weakening soil fertility, affecting crop growth, and even threatening food production safety.

[0003] At present, the common way to deal with residual mulch is to collect and incinerate the mulch, but incineration will pollute the environment. However, mulch is a plastic product, which can be converted into recyclable liquid fuel by rapid pyrolysis without polluting the environment. It is an effective way to harmlessly treat mulch. Therefore, designing a device that can achieve rapid pyrolysis of mulch is a solution to the current urgent problem of mulch recycling. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a device for producing oil by rapid pyrolysis of waste agricultural mulch films.

[0005] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0006] A device for producing oil by rapid pyrolysis of waste agricultural mulch film, mainly comprising a mulch film crusher, a feed hopper, a screw feed conveyor, a bubbling fluidized bed, a cyclone separator, a primary condenser, a gas-liquid separator, and a fluidizing gas supply system;

[0007] The discharge port of the film crusher is connected to the upper feed port of the feed hopper through a feed pipe, and the lower end of the feed hopper is vertically fixedly connected to the feed port on the outer sleeve of the screw feeder conveyor; the end of the outer sleeve of the screw feeder conveyor away from the feed port is inserted into the lower middle position of the vertically arranged bubbling fluidized bed; the cyclone separator is built into the bubbling fluidized bed with the solid discharge port facing downward and the gas discharge port facing upward, and the gas discharge end of the cyclone separator passes through the reserved hole on the top wall of the bubbling fluidized bed, and the gas discharge end of the cyclone separator is connected to the primary condenser through an insulation pipeline. The input end is connected, and the output end of the first-stage condenser is connected to the input end of the gas-liquid separator; the fluidizing gas supply system adopts a biomass combustion gas supply system, and the fluidizing gas supply system is connected to the fluidizing gas input port arranged on the lower end side of the bubbling fluidized bed through a gas transmission pipeline, so that the flue gas generated by combustion can be input as fluidizing gas; the fluidizing gas supply system is connected to the heat storage bed material input interface of the bubbling fluidized bed through a downward inclined pipeline, and the heat storage bed material input interface is arranged at a position close to the lower end side of the bubbling fluidized bed and above the air distribution plate inside it, so that the solid residue generated by combustion can be input as a heat carrier.

[0008] Moreover, the bubbling fluidized bed adopts a variable diameter bubbling fluidized bed with a smaller bottom and a larger top.

[0009] Moreover, the fluidizing gas supply system includes a biomass combustion furnace, a buffer tank, an air supply fan, a flow regulating valve, and a rotor flow meter; the exhaust port of the biomass combustion furnace is connected to the air inlet of the buffer tank through a front-end gas pipeline, and the exhaust port of the buffer tank is connected to the fluidizing gas input port of the bubbling fluidized bed through a rear-end gas pipeline, and the air supply fan, flow regulating valve, and rotor flow meter are successively installed on the rear-end input pipeline; the exhaust port of the biomass combustion furnace is connected to the downward inclined pipeline.

[0010] Moreover, an in-bed temperature measuring tube is arranged in the bubbling fluidized bed, the upper end of which extends out from the reserved hole at the top of the bubbling fluidized bed and is installed with a temperature gauge; a temperature gauge and a pressure gauge are installed on the rear end gas supply pipeline near the fluidizing gas inlet of the bubbling fluidized bed; and a pressure gauge is installed at the gas discharge end of the cyclone separator.

[0011] Furthermore, a valve is installed on the lower inclined pipeline.

[0012] The advantages and positive effects of the utility model are:

[0013] 1. The utility model uses the heat generated by burning biomass in the biomass combustion furnace as a heat source, reducing the dependence on electrical energy.

[0014] 2. The utility model adopts the solid residue produced by burning biomass in a biomass combustion furnace as the heat storage bed material for fluidized treatment, and the flue gas emitted by the biomass combustion furnace is supplied to the bubbling fluidized bed as an inert fluidizing gas and heat source, thereby achieving full utilization of the heat energy generated by biomass combustion and saving fluidizing gas and energy.

[0015] 3. The utility model places the cyclone separator inside the bubbling fluidized bed and uses an insulated pipeline to transport the gas generated by pyrolysis, which reduces the cooling during the transportation process, reduces energy consumption, prevents the generation of tar after cooling, and thus avoids the blockage of the gas path.

[0016] 4. The bubbling fluidized bed of the utility model adopts a variable diameter fluidized bed, and the enlarged part can reduce the air flow velocity, reduce particle carryout and particle concentration, and reduce adverse side reactions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model. DETAILED DESCRIPTION

[0018] The structure of the utility model is further described below with reference to the accompanying drawings and through embodiments. It should be noted that the embodiments are descriptive rather than restrictive.

[0019] A device for rapid pyrolysis of waste agricultural mulch film to produce oil, see Figure 1 The invention point is: it mainly includes a ground film crusher 1, a feed hopper 3, a screw feed conveyor 4, a bubbling fluidized bed 5, a cyclone separator 6, a primary condenser 9, a gas-liquid separator 10, and a fluidizing gas supply system.

[0020] The ground film crusher is used to realize the crushing process of collected ground films.

[0021] The spiral feeder conveyor is used to transport the crushed ground film into the bubbling fluidized bed, and mainly includes a motor, a frequency converter, a screw and an outer sleeve. The screw is arranged in the outer sleeve, driven by the motor, and the frequency of the motor is adjusted by the frequency converter. A feed port is arranged at an upper position of the outer sleeve away from one end of the bubbling fluidized bed. The feed hopper adopts a conical hopper, the upper end of the feed hopper is the feed port, and the lower end of the feed hopper is vertically fixedly connected to the feed port of the outer sleeve. A conveying pipe 2 is connected between the feed port of the feed hopper and the discharge port of the ground film crusher.

[0022] The bubbling fluidized bed is used to realize the pyrolysis treatment of ground film crushed materials. The bubbling fluidized bed is arranged vertically, and a fluidizing gas input port is arranged on the side of the lower end of the bubbling fluidized bed. A heat storage bed material input interface is arranged above the air distribution plate located inside the bubbling fluidized bed on the side close to the lower end; a ground film input port is arranged at the middle and lower position of the other side of the bubbling fluidized bed, for the outer sleeve of the spiral feeder conveyor to be inserted into the end away from the motor, so as to realize the input of ground film crushed materials. In the utility model, the bubbling fluidized bed adopts a variable diameter bubbling fluidized bed with a small bottom and a large top. Among them, the above-mentioned fluidizing gas input port, the heat storage bed material input interface, and the ground film input port are all arranged on the small diameter section at the bottom of the bubbling fluidized bed. Since the ground film crushed materials are light, they are easy to float up under the action of airflow. The utility model adopts a variable diameter design with a large top and a small bottom. The upper enlarged part can reduce the airflow velocity, reduce the particle carryout and particle concentration, and reduce adverse side reactions, which is conducive to full pyrolysis.

[0023] The cyclone separator is used to achieve gas-solid separation. The cyclone separator is built into the bubbling fluidized bed in a manner that the solid discharge port faces downward and the gas discharge port faces upward, and the gas discharge end of the cyclone separator passes through the reserved hole on the top wall of the bubbling fluidized bed. The gas discharge end of the cyclone separator is connected to the input end of the primary condenser through an insulation pipeline 8 (which can be achieved by providing an insulation layer on the outside of the pipeline), and the output end of the primary condenser is connected to the input end of the gas-liquid separator to achieve separation of condensed gas and liquid, wherein the liquid is liquid fuel after pyrolysis of the ground film, which is stored in the liquid storage chamber inside the gas-liquid separator and can be output through a drain valve installed at the lower end. The gas is discharged through the exhaust port on the side.

[0024] The fluidizing gas supply system uses biomass combustion to achieve gas supply, and mainly includes a biomass combustion furnace 11, a buffer tank 13, an air supply fan 14, a flow regulating valve 15, a rotor flow meter 16, etc. The combustion medium of the biomass combustion furnace is plant straw, etc. The exhaust port of the biomass combustion furnace is connected to the air inlet of the buffer tank through the front-end gas pipeline 12, and the exhaust port of the buffer tank is connected to the fluidizer input port of the bubbling fluidized bed through the rear-end gas pipeline 17. The air supply fan, flow regulating valve, and rotor flow meter are successively installed on the rear-end input pipeline to achieve the regulation and control of the air supply flow, which is used to input the flue gas emitted by the biomass combustion furnace into the inner cavity of the bubbling fluidized bed as an inert fluidizing gas and heat source. The solid discharge port of the biomass combustion furnace is connected to the heat storage bed material input interface of the bubbling fluidized bed through a downward inclined pipeline 18, which is used to input the solid residue generated by biomass combustion as a heat carrier into the inner cavity of the bubbling fluidized bed by gravity, and use it as heat storage bed material, thereby achieving full utilization of the solids and gases generated by biomass combustion.

[0025] In addition to the above technical features, a temperature measuring tube 7 is provided in the bubbling fluidized bed for measuring the temperature in the bubbling fluidized bed to realize the regulation and control of the input amount of the bottom fluidizing gas. The upper end of the temperature measuring tube in the bed extends from the reserved hole at the top of the bubbling fluidized bed, and is installed with a thermometer to realize the display of the measured temperature in the bubbling fluidized bed. A thermometer and a pressure gauge are installed on the above-mentioned rear-end gas transmission pipeline near the fluidizing gas input port of the bubbling fluidized bed to realize the measurement of the fluidizing gas input temperature and pressure. A pressure gauge is installed at the gas discharge end of the cyclone separator to monitor the pressure of the output gas, etc. A valve 19 is installed on the above-mentioned lower inclined pipeline to realize the switch control of the lower inclined pipeline, thereby realizing the control of the input amount of the heat storage bed material.

[0026] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A device for producing oil from waste agricultural mulch film by rapid pyrolysis, characterized in that: It includes a ground film crusher, a feed hopper, a screw feed conveyor, a bubbling fluidized bed, a cyclone separator, a primary condenser, a gas-liquid separator, and a fluidizing gas supply system; The discharge port of the mulch crusher is connected to the upper feed port of the feed hopper through a feed pipe, and the lower end of the feed hopper is vertically fixedly connected to the feed port on the outer sleeve of the screw feeder conveyor; the end of the outer sleeve of the screw feeder conveyor away from the feed port is inserted into the lower middle position of the vertically arranged bubbling fluidized bed; the cyclone separator is built into the bubbling fluidized bed in a manner with the solid discharge port facing downward and the gas discharge port facing upward, and the gas discharge end of the cyclone separator passes through the reserved hole on the top wall of the bubbling fluidized bed, and the gas discharge end of the cyclone separator is connected to the input end of the primary condenser through an insulation pipeline, and the output end of the primary condenser is connected to the input end of the gas-liquid separator; the fluidizing gas supply system adopts a biomass combustion gas supply system, and the fluidizing gas supply system is connected to the fluidizing gas input port arranged on the lower end side of the bubbling fluidized bed through a gas transmission pipeline, so that the flue gas generated by combustion is input as fluidizing gas; The fluidizing gas supply system is connected to the heat storage bed material input interface of the bubbling fluidized bed through a downward inclined pipeline. The heat storage bed material input interface is arranged near the lower end of the bubbling fluidized bed and above the air distribution plate inside it, so that the solid residue generated by combustion can be input as a heat carrier.

2. The device for producing oil from waste agricultural mulch film by rapid pyrolysis according to claim 1, characterized in that: The bubbling fluidized bed adopts a variable diameter bubbling fluidized bed with a smaller bottom and a larger top.

3. The device for producing oil from waste agricultural mulch film by rapid pyrolysis according to claim 1, characterized in that: The fluidizing gas supply system includes a biomass combustion furnace, a buffer tank, an air supply fan, a flow regulating valve, and a rotor flow meter; the exhaust port of the biomass combustion furnace is connected to the air inlet of the buffer tank through a front-end gas pipeline, and the exhaust port of the buffer tank is connected to the fluidizing gas input port of the bubbling fluidized bed through a rear-end gas pipeline, and the air supply fan, flow regulating valve, and rotor flow meter are successively installed on the rear-end input pipeline; the exhaust port of the biomass combustion furnace is connected to the downward inclined pipeline.

4. The device for producing oil from waste agricultural mulch film by rapid pyrolysis according to claim 3 is characterized in that: An in-bed temperature measuring tube is arranged in the bubbling fluidized bed, the upper end of which extends out from a reserved hole at the top of the bubbling fluidized bed and is equipped with a temperature gauge; a temperature gauge and a pressure gauge are installed on the rear end gas transmission pipeline near the fluidizing gas inlet of the bubbling fluidized bed; and a pressure gauge is installed at the gas discharge end of the cyclone separator.

5. The device for producing oil from waste agricultural mulch film by rapid pyrolysis according to claim 1, characterized in that: A valve is installed on the lower inclined pipeline.

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