CN-118421346-B - Biomass microwave pyrolysis reforming device and control method thereof

CN118421346BCN 118421346 BCN118421346 BCN 118421346BCN-118421346-B

Abstract

The invention discloses a biomass microwave pyrolysis reforming device and a control method thereof, wherein the biomass microwave pyrolysis reforming device comprises pyrolysis reforming equipment, a discharging tower and control equipment, the pyrolysis reforming equipment comprises a feeding screw shaft, a microwave heating cavity and a microwave generator provided with a plurality of controllable microwave sources, a tubular reactor comprises a pyrolysis section positioned at the front part and a reforming section positioned at the rear part, a shaft body of the feeding screw shaft is of hollow design and is provided with a plurality of steam spray holes at the corresponding position of the reforming section, steam branch pipes are respectively connected with the steam spray holes in an inner cavity of a shaft body, each steam branch pipe provided with a control valve is connected with the steam generator through a dynamic sealing mechanism after being converged into the steam main pipe, and the control equipment executes control actions of the controllable microwave sources, the feeding screw shaft and the control valves according to control instructions. The invention can effectively save energy consumption and simplify the complexity of the process.

Inventors

Wu Sikan
ZHANG BIAO
XIAO BIN
WANG XIN
SONG YONGYI

Assignees

中国石油化工股份有限公司
中石化（大连）石油化工研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20230202

Claims (9)

1. The biomass microwave pyrolysis reforming device is characterized by comprising pyrolysis reforming equipment, a discharging tower, a treatment device and control equipment; The pyrolysis reforming equipment comprises a feeding screw shaft, a microwave heating cavity and a microwave generator provided with a plurality of controllable microwave sources, wherein materials are conveyed by the feeding screw shaft to pass through a tubular reactor in the microwave heating cavity, heated by the microwave generator and fall into the discharge tower; The feeding screw shaft comprises a shaft body, a steam branch guide pipe, a dynamic sealing mechanism, a steam generator, a control valve, a steam main guide pipe, a dynamic sealing mechanism and a control valve, wherein the shaft body of the feeding screw shaft is hollow, and a plurality of steam spray holes are arranged at positions corresponding to reforming sections; The control equipment executes control actions of the controllable microwave source, the feeding screw shaft and the control valve according to control instructions; the processing device is used for generating control instructions of the control valves according to preset rules, wherein the preset rules comprise setting injection periods and injection amounts of each time for the steam injection holes at positions corresponding to the reforming sections, the processing device is further used for generating control instructions for opening the control valves corresponding to the hot spot effect areas when the steam injection holes at the positions corresponding to the pyrolysis sections are predicted to generate hot spot effect according to the three-dimensional electromagnetic field model, and the processing device is further used for generating control instructions for adjusting amounts of the control valves according to the three-dimensional electromagnetic field model and the temperature field distribution predicted values and/or the gas-solid composition data predicted values of the reforming sections for the steam injection holes at the positions corresponding to the reforming sections.
2. The biomass microwave pyrolysis reformer assembly of claim 1, comprising: The feed screw shaft disposed transversely within the tubular reactor includes helical blades for pushing the material: The blade spacing of the helical blade is gradually reduced from the driving end to the tail end.
3. The biomass microwave pyrolysis reformer assembly of claim 2, comprising: one end of the feeding screw shaft is connected with the driving motor, and the other end of the feeding screw shaft is connected with the water vapor branch conduit.
4. A biomass microwave pyrolysis reformer according to claim 3, comprising: the feeding screw shaft is detachably connected with the driving motor.
5. The biomass microwave pyrolysis reformer assembly of claim 4, comprising: The feeding screw shaft is arranged transversely to the central axis of the tubular reactor.
6. The biomass microwave pyrolysis reformer assembly of claim 5, comprising: the material of the feeding screw shaft comprises a graphite synthetic material or a metal material.
7. A control method of a biomass microwave pyrolysis reformer for controlling the biomass microwave pyrolysis reformer according to any one of claims 1 to 6, comprising: s11, generating a corresponding three-dimensional electromagnetic field model according to the pyrolysis reforming equipment and gridding the model; S12, determining input parameters of the three-dimensional electromagnetic field model, wherein the input parameters comprise microwave power of each controllable microwave source in the pyrolysis reforming equipment, air inflow of each steam spray hole, physical property parameters of materials and steam and material feeding rate; S13, taking a preset time step as a calculation period, and obtaining a simulation result of the three-dimensional electromagnetic field model in a steady state according to the input parameters, wherein the simulation result comprises a predicted value of temperature field distribution and a predicted value of gas-solid component distribution of the tubular reactor after one time step; s14, judging whether each temperature control area in the reforming section comprises an exceeding grid exceeding the gas-solid component threshold value after a time step according to the gas-solid component distribution predicted value, if so, calculating the minimum air inflow of the steam spray holes corresponding to the exceeding grid according to a preset algorithm, and returning the minimum air inflow to the step S13 as the updated air inflow; S15, judging whether the reforming section comprises an exceeding grid exceeding the target temperature interval according to the temperature field distribution predicted value after a time step, if so, adjusting the air inflow of the steam jet holes corresponding to the exceeding grid and/or the microwave power of the controllable microwave source according to a preset rule, and returning the air inflow and/or the microwave power after updating to the step S13, and if not, taking the current air inflow as the target air inflow and the current microwave power as the target microwave power, and generating a control instruction of a control valve of the steam jet holes of the temperature control area belonging to the exceeding grid area and a control instruction of the microwave power.
8. A control device for a biomass microwave pyrolysis reformer, comprising: A memory for storing a computer program; A processor for invoking and executing said computer program to implement the control method steps of the biomass microwave pyrolysis reformer according to claim 7.
9. A storage medium comprising a software program adapted to be executed by a processor for controlling method steps of a biomass microwave pyrolysis reformer according to claim 7.

Description

Biomass microwave pyrolysis reforming device and control method thereof Technical Field The invention relates to the field of chemical technology, in particular to a biomass microwave pyrolysis reforming device and a control method thereof. Background Biomass pyrolysis, which generally refers to the process of producing coke, condensable fluid and gaseous products by heating biomass to raise the temperature to cause molecular decomposition in an anaerobic or hypoxic environment, is an important utilization form of biomass energy. Steam reforming generally refers to the process of producing synthesis gas from hydrocarbon materials or fixed carbon under the action of steam. Since pyrolysis of biomass produces a portion of tar and hydrocarbon gas products, a secondary reaction of such materials by means of a reforming reaction of steam at high temperature is required to redirect the production of the desired gas products. In the prior art, a multi-reactor arrangement is generally adopted, that is, different reactors are connected to perform biomass pyrolysis and steam reforming respectively. The inventor finds that the following defects exist in the prior art adopting a multi-reactor setting mode: in the design mode of multiple reactors, materials need to be conveyed, so that extra energy loss is easy to cause, the complexity of the process is increased, and the industrial application is not facilitated. The above information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. Disclosure of Invention The invention aims to save energy consumption in the process of biomass pyrolysis and reforming and simplify the complexity of the process. The invention provides a biomass microwave pyrolysis reforming device, which comprises pyrolysis reforming equipment, a discharging tower and control equipment, wherein the discharging tower is arranged on the upper surface of the pyrolysis reforming equipment; The pyrolysis reforming equipment comprises a feeding screw shaft, a microwave heating cavity and a microwave generator provided with a plurality of controllable microwave sources, wherein materials are conveyed by the feeding screw shaft to pass through a tubular reactor in the microwave heating cavity, heated by the microwave generator and fall into the discharge tower; The feeding screw shaft comprises a shaft body, a steam branch guide pipe, a dynamic sealing mechanism, a steam generator, a control valve, a steam main guide pipe, a dynamic sealing mechanism and a control valve, wherein the shaft body of the feeding screw shaft is hollow, and a plurality of steam spray holes are arranged at positions corresponding to reforming sections; And the control equipment executes the control actions of the controllable microwave source, the feeding screw shaft and the control valve according to the control instruction. Preferably, in the present invention, further comprising: the shaft body of the feeding screw shaft is provided with a plurality of steam spray holes at the corresponding positions of the pyrolysis section. Preferably, in the present invention, it includes: The feed screw shaft disposed transversely within the tubular reactor includes helical blades for pushing the material: The blade spacing of the helical blade is gradually reduced from the driving end to the tail end. Preferably, in the present invention, it includes: one end of the feeding screw shaft is connected with the driving motor, and the other end of the feeding screw shaft is connected with the water vapor branch conduit. Preferably, in the present invention, it includes: the feeding screw shaft is detachably connected with the driving motor. Preferably, in the present invention, it includes: The feeding screw shaft is arranged transversely to the central axis of the tubular reactor. Preferably, in the present invention, it includes: the material of the feeding screw shaft comprises a graphite synthetic material or a metal material. Preferably, in the present invention, the apparatus further comprises a processing device; the processing device is used for generating a control instruction of the control valve according to a preset rule, wherein the preset rule comprises the following steps: The injection period and the injection amount of each injection are set for the steam injection holes at the positions corresponding to the reforming stages. Preferably, in the present invention, the processing device is further configured to: And when the steam jet holes at the positions corresponding to the pyrolysis section predict that a certain area of the pyrolysis section will generate hot spot effect according to the three-dimensional electromagnetic field model, generating a control instruction for opening a control val