CN-121974296-A - Pre-oscillation coupled coaxial rotational flow piezoelectric hydrogen production and degassing integrated method and device

CN121974296ACN 121974296 ACN121974296 ACN 121974296ACN-121974296-A

Abstract

The invention discloses a pre-oscillation coupling coaxial rotational flow piezoelectric hydrogen production and degassing integrated method and device, wherein the method comprises the steps that water phase and piezoelectric catalytic materials enter a pre-oscillation unit to modulate the rotational direction of inlet fluid and oscillation excitation characteristics thereof, so that stable and repeatable mechanical excitation conditions are formed; fluid then enters a main rotational flow oscillation section for rotational flow piezoelectric hydrogen production, the piezoelectric material is induced to generate rotation-revolution coupling motion under the actions of strong rotational flow, shearing and centrifugal fields, piezoelectric response is continuously excited, hydrogen evolution reaction is driven, and in-situ degassing and phase diversion are realized through an integrated flow path of overflow port hydrogen-rich discharge and bottom flow port liquid discharge while rotational flow piezoelectric hydrogen production is carried out. The adjustable pre-oscillation structure is introduced on the basis of the cyclone reinforcement to stabilize the inlet excitation, the piezoelectric excitation is reinforced by the graded coupling with the cyclone oscillation, and meanwhile, the in-situ degassing is realized through the integrated flow path of overflow hydrogen enrichment and underflow liquid drainage, so that the continuous operation stability and the amplification mobility are improved.

Inventors

FU PENGBO
ZHANG MENGKE
ZHU SHU
ZHAO WEI
LEI JINPENG
JIANG ZHIQIN
JIANG YUE
XING MINGYANG
WANG HUALIN

Assignees

华东理工大学

Dates

Publication Date: 20260505
Application Date: 20260204

Claims (10)

1. The coaxial rotational flow piezoelectric hydrogen production and degassing integrated method with pre-oscillation coupling is characterized by comprising the following steps: S1, enabling a suspension liquid of an aqueous phase medium and a piezoelectric catalytic material to enter a pre-oscillation unit, modulating the rotation direction of inlet fluid and oscillation excitation characteristics thereof to form stable and repeatable mechanical excitation conditions, and enabling the piezoelectric material to be in a periodic mechanical load environment before entering a main rotational flow oscillation section; S2, fluid then enters a main rotational flow oscillation section for rotational flow piezoelectric hydrogen production, and under the action of strong rotational flow, shearing and centrifugal fields, the piezoelectric material is induced to generate rotation-revolution coupling motion and is subjected to periodic coupling centrifugal force and shearing load so as to continuously excite piezoelectric response and drive hydrogen evolution reaction; S3, realizing in-situ degassing and phase diversion through an integrated flow path of overflow port hydrogen-rich discharge and bottom flow port liquid discharge while spiral-flow piezoelectric hydrogen production, and reducing hydrogen retention and liquid phase entrainment back mixing.
2. The integrated pre-oscillation coupled coaxial cyclonic piezoelectric hydrogen production and degassing process of claim 1, wherein the aqueous medium includes, but is not limited to, pure water, sea water, surface water and industrial waste water.
3. The integrated pre-oscillation coupled coaxial cyclone piezoelectric hydrogen production and degassing method according to claim 1, wherein the piezoelectric catalytic material is in the form of powder particles, sheet/fiber materials, coating layers or supported materials, or is a single piezoelectric material or a composite piezoelectric catalyst system formed with a cocatalyst or a sacrificial agent.
4. The integrated pre-oscillation coupled coaxial swirl piezoelectric hydrogen production and degassing method according to claim 1, wherein the piezoelectric catalytic material comprises but is not limited to MoS 2 and its modified materials, znO, baTiO 3 , PZT, niobate/tantalate/titanate type inorganic piezoelectric materials.
5. The device is characterized by comprising a vortex oscillation piezoelectric excitation and overflow hydrogen-enriched degassing integrated unit and a pre-oscillation unit coaxially arranged with the same.
6. The integrated pre-oscillation coupled coaxial rotational flow piezoelectric hydrogen production and degassing device according to claim 5, wherein the integrated unit of rotational flow oscillation piezoelectric excitation and overflow hydrogen enrichment and degassing is a cyclone, and the pre-oscillation unit is a pre-oscillation runner coaxially arranged with the cyclone.
7. The integrated pre-oscillation coupled coaxial swirling piezoelectric hydrogen production and degassing device according to claim 6, wherein the pre-oscillation unit is an annular flow passage formed between the pre-oscillation housing and the cyclone, which is coaxially arranged outside the cyclone, or is an independent pre-oscillation section communicated with the inlet of the cyclone.
8. The integrated pre-oscillation coupled coaxial rotational flow piezoelectric hydrogen production and degassing device according to claim 7, wherein the pre-oscillation unit is an annular flow passage formed between the pre-oscillation shell and the cyclone and coaxially arranged outside the cyclone, and an inlet excitation regulating structure is further arranged in the annular flow passage, and is a spiral guide vane, a guide grid, an annular guide vane or a combination thereof.
9. The integrated pre-oscillation coupled coaxial rotational flow piezoelectric hydrogen production and degassing device according to claim 8, wherein the inlet excitation regulating structure is a spiral guide vane arranged on the inner side wall surface or the outer side wall surface of the annular flow passage.
10. A piezoelectric hydrogen production system, characterized in that the coaxial spiral-flow piezoelectric hydrogen production and degassing integrated device coupled by pre-oscillation according to any one of claims 5-9 is adopted.

Description

Pre-oscillation coupled coaxial rotational flow piezoelectric hydrogen production and degassing integrated method and device Technical Field The invention belongs to the technical field of piezoelectric hydrogen production, and particularly relates to a coaxial rotational flow piezoelectric hydrogen production and degassing integrated method and device with pre-oscillation coupling. Background The core of piezocatalysis hydrogen production is to convert mechanical disturbance into strain and polarization response inside piezoelectric material. When the piezoelectric material is deformed under the actions of shearing, collision or vibration, the polarization state of the piezoelectric material evolves, and transient charge enrichment and a local electric field appear on the surface of the piezoelectric material, so that a driving force for electron/hole separation and migration is provided for water molecule interface reaction, and a hydrogen evolution process is excited. In recent years, a great deal of research has been carried out to verify the feasibility of hydrogen evolution in aqueous systems of various types, to investigate how the pain point, and hence the "material, can produce hydrogen" is turned to a reactor to convert mechanical energy stably and effectively into sustainable piezoelectric actuation. On the engineering scale of the reactor, the determining factor of the performance of the piezoelectric hydrogen production equipment is not a single material performance index any more, but is whether the mechanical load can act on the catalyst system in a stable and reproducible manner, and the cooperative management of mass transfer and gas production separation is realized in the operation process, and the key links determine whether the piezoelectric hydrogen production can be operated continuously from the feasible stable running of the pilot scale to the amplifying mobility. The existing device generally adopts modes of ultrasonic, stirring/vibration or grinding and the like to provide mechanical excitation, but common bottlenecks are exposed in engineering amplification and continuous operation, namely, firstly, the stress state of a piezoelectric material can be changed due to the change of working conditions such as flow, bubble content, particle content and the like in the operation process, so that the stress intensity and stress frequency are fluctuated to influence the stability of piezoelectric driving, secondly, the excitation energy is limited in effective coverage in space, the existence of an effective area and an inert area is easy to coexist after amplification, the overall piezoelectric efficiency is limited, thirdly, bubbles are blocked and local flow state is changed due to the retention of hydrogen microbubbles in a reaction area, mass transfer and stress coupling are further weakened, negative feedback of accumulated amplification along with the operation time is formed, and finally, the hydrogen production fluctuation and attenuation are shown. In order to strengthen mechanical load and mass transfer capacity, a hydraulic excitation type piezoelectric reactor constructed by using a cyclone which is mature chemical equipment has great potential. The special boundary condition of the cyclone causes the inside of the reactor to generate strong cyclone and remarkable cyclone oscillation, so that the piezoelectric material (particles or carriers) is in a continuous stress state in a centrifugal field and a shearing field. Under the action of the rotational flow structure, particles do spiral motion along with fluid and can also generate rotation and revolution coupling motion, so that coupling centrifugal force and shearing load with periodic characteristics are generated, continuous mechanical stress input is provided for piezoelectric materials, piezoelectric response is induced, and meanwhile, the method is beneficial to strengthening mixed mass transfer and promoting enrichment and separation of bubbles to the center. The existing rotational flow piezoelectric hydrogen production equipment is highly sensitive to inlet disturbance and working condition fluctuation, so that the internal vortex core structure, pressure pulsation and turbulence level drift along with the running condition, and piezoelectric excitation is difficult to keep stable and reproducible. Meanwhile, the effective residence in the cyclone reaction process is insufficient, so that the accumulation of mechanical stress and interface reaction is insufficient. In particular, due to the lack of a structural design of a degassing flow path, generated hydrogen is easy to stay in a reaction zone or be entrained and mixed back by a liquid phase and carried out along with an underflow, so that the hydrogen production capacity is reduced. Disclosure of Invention In view of the above problems in the prior art, the present invention aims to introduce an adjustable pre-oscillating structure on the basis of cyclone rein