CN-122015553-A - Fly ash fluidization heat storage and release system and operation method

CN122015553ACN 122015553 ACN122015553 ACN 122015553ACN-122015553-A

Abstract

The invention relates to a fly ash fluidization heat storage and release system and an operation method thereof, wherein the fly ash fluidization heat storage and release system comprises a high-temperature heat exchange section, a transition section and a low-temperature heat exchange section, wherein the transition section is used for communicating the high-temperature heat exchange section with the low-temperature heat exchange section, the system adopts high-speed airflow to fluidize fly ash particles, and can adopt the fly ash particles with small particle size and relatively low fluidization speed to exchange heat when being positioned in a low-temperature section, and adopts the fly ash particles with large particle size and relatively increased fluidization speed to exchange heat when being positioned in a high-temperature section. Compared with the conventional air flow heat exchange process of coal ash accumulation, the system can improve the energy storage and release efficiency of the coal ash by increasing the heat exchange area and the heat exchange strength of air flow of gas and solid phases, realize the high-value utilization of the coal ash and solve the cascade utilization problem of the fluidized heat storage of the coal ash.

Inventors

SONG MINHANG
HU YANG
LU KUO
XIE DONGHANG
WANG WEI
LIN ZIJIAN

Assignees

华北科技学院(中国煤矿安全技术培训中心)

Dates

Publication Date: 20260512
Application Date: 20260408

Claims (5)

1. The fly ash fluidization heat storage and release system is characterized by comprising a high-temperature heat exchange section, a transition section and a low-temperature heat exchange section which are coaxially nested, wherein the high-temperature heat exchange section, the transition section and the low-temperature heat exchange section are cooperatively used for realizing fluidization heat storage and release of fly ash particles; The high-temperature heat exchange section comprises a high-temperature gas inlet and outlet pipe, a high-temperature section steady flow cavity, a high-temperature section particle reflux channel, a high-temperature section fluidization area, a high-temperature section particle collection channel, a high-temperature section separation ring, a high-temperature section outer cylinder, a swirl vane and a high-temperature section steady flow distribution cavity, wherein the high-temperature section outer cylinder is coaxially sleeved outside the high-temperature gas inlet and outlet pipe; A high-temperature section top inner through hole is formed in the position, close to the top end face, of the upper wall surface of the high-temperature gas inlet and outlet pipe, and a high-temperature section top inner shielding plate is arranged on the inner side of the high-temperature section inner through hole opposite to each high-temperature Duan Dingbu inner through hole in an adhering manner; The lower wall surface of the high-temperature gas inlet and outlet pipe is provided with a high-temperature section bottom inner through hole near the bottom annular closed end surface, and a high-temperature section bottom inner shielding plate is arranged on the outer side of the high-temperature section bottom inner through hole opposite to each high-temperature section bottom inner through hole in an adhering manner; the upper wall surface and the lower wall surface of the high-temperature section outer cylinder are respectively positioned on the same plane with the inner through hole at the top of the high-temperature section and the inner through hole at the bottom of the high-temperature section, and are oppositely provided with the outer through hole at the top of the high-temperature section and the outer through hole at the bottom of the high-temperature section, and the outer sides of the high-temperature section outer through holes are opposite to the outer through holes at each high-temperature Duan Dingbu and the outer through holes at the bottom of the high-temperature section respectively and are respectively provided with corresponding outer shielding plates in an adhering manner; The inner side wall surface of the high-temperature section outer cylinder is provided with a high-temperature section baffle ring, swirl blades are uniformly fixed in the annular channel between the high-temperature section baffle ring and the high-temperature gas inlet and outlet pipe along the circumferential direction, and the upper end surfaces of the swirl blades are level with the upper wall surface of the high-temperature section baffle ring; the high temperature section separating ring is coaxial with the high temperature gas inlet and outlet pipe and sleeved outside the high temperature gas inlet and outlet pipe, the inner wall surface of the cyclone blade is aligned with the inner wall surface of the baffle ring of the high temperature section, and the upper end area is fixed on the outer wall of the lower part of the cyclone blade; the inner side wall surface of the high-temperature section outer cylinder is provided with a high Wen Duanbu wind distribution plate which is an annular body, an air flow channel is arranged in the inner part, fly ash particles are paved on the upper part of the fly ash; The low-temperature heat exchange section comprises a low-temperature Duan Wenliu cavity, a low-temperature Duan Keli reflux channel, a low-temperature section particle downlink annular cavity, a low-temperature section fluidization area, a low-temperature Duan Zhongjian cylinder, a low-temperature Duan Keli collecting channel, a low-temperature Duan Natong, a low-temperature Duan Wenliu distribution cavity, a low-temperature gas inlet and outlet pipe, a low-temperature section outer shell and a low-temperature section airflow outer channel, wherein the low-temperature Duan Natong is coaxially sleeved outside the high-temperature section outer shell; the upper wall surface of the low temperature Duan Natong is provided with inner through holes of low temperature Duan Dingbu at the position close to the top end surface, and inner side of the inner through holes facing each inner through hole of low temperature Duan Dingbu is provided with inner shielding plates of low temperature Duan Dingbu in an adhering manner; a low-temperature section bottom inner through hole is formed in the lower wall surface of the low temperature Duan Natong near the bottom annular closed end surface, and a low-temperature section bottom inner shielding plate is arranged on the outer side of the lower wall surface facing each low-temperature section bottom inner through hole in an adhering manner; a low-temperature Duan Dingbu outer through hole is formed in the position, close to the top end face, of the upper wall surface of the low-temperature section middle cylinder, and a low-temperature Duan Dingbu outer shielding plate is arranged on the outer side of the low-temperature section middle cylinder, opposite to each low-temperature Duan Dingbu outer through hole in an adhering mode; The lower wall surface of the low-temperature section middle cylinder is provided with a low-temperature section bottom outer through hole near the bottom annular closed end surface, and the inner side of the low-temperature section middle cylinder is provided with a low-temperature section bottom outer shielding plate in a sticking manner at the position opposite to each low-temperature section bottom outer through hole; The inner side wall surface of the low-temperature section middle cylinder is provided with a low temperature Duan Danghuan, a concentration taper ring is fixed in the annular channel between the low temperature Duan Danghuan and the low-temperature section inner cylinder along the circumferential direction, and the upper end surface of the concentration taper ring is level with the lower wall surface of the low temperature Duan Danghuan; The low-temperature section separating ring is of a cylinder structure, is coaxial with the low temperature Duan Natong, is sleeved on the outer side of the low temperature Duan Natong and is close to the inner wall surface of the low-temperature section middle cylinder, the inner wall surface of the low-temperature section separating ring is aligned with the inner wall surface of the low temperature Duan Danghuan, and is fixed on the inner wall of the low-temperature section middle cylinder through the fixing rib; The low-temperature section middle cylinder is provided with a low-temperature Duan Bufeng flow distribution plate on the inner side wall surface, the air distribution flow distribution plate is an annular body, an air flow channel is arranged in the air distribution flow distribution plate and is fixed between the low-temperature Duan Zhongjian cylinder and the low-temperature section inner cylinder, and small-diameter fly ash particles are paved on the upper part of the air distribution flow distribution plate; the transition section is sleeved on the outer side of the high-temperature heat exchange section, the high-temperature heat exchange section on the inner side is communicated with the low-temperature heat exchange section on the outer side, and the upper end and the lower end of the low temperature Duan Natong are sealed in a region formed by the transition section through annular plates; The low-temperature section shell is covered on the high-temperature heat exchange section, the upper part of the transition section and the circumferential side of the low-temperature heat exchange section, the low-temperature gas inlet and outlet pipe is coaxial with the low-temperature Duan Waike body, is vertically arranged at the center of the upper part of the low-temperature section shell, and is communicated with the low-temperature section gas flow outer channel.
2. The fly ash fluidization heat and heat storage and release system as set forth in claim 1, wherein the swirl vanes consist of a plurality of vanes uniformly arranged along the circumferential direction, each vane forming an angle with the axial direction of the high temperature gas inlet and outlet pipe, and being capable of guiding the flowing air flow into a rotating air flow.
3. The fly ash fluidization heat storage and release system as set forth in claim 2, wherein the concentration cone ring is composed of a plurality of cone rings coaxially arranged, and the diameter of each cone ring is gradually increased from bottom to top for realizing separation and collection of fly ash particles.
4. A fly ash fluidization heat storage method using the system of any one of claims 1 to 3, comprising the steps of: S1, high-temperature air flows in from a high-temperature air inlet and outlet pipe, pushes an inner shielding plate at the bottom of a high-temperature section to open outwards, and enters a high-temperature section steady flow cavity through an inner through hole at the bottom of the high-temperature section; S2, enabling the high-temperature air flow to flow through a high Wen Duanbu air flow dividing plate to form uniformly distributed uplink high-temperature air flow, blowing up large-diameter fly ash particles at the upper part of the high Wen Duanbu air flow dividing plate, performing fluidization heat exchange, enabling the temperature of the large-diameter fly ash particles to rise, and simultaneously releasing part of heat of the high-temperature air flow to be converted into medium-temperature air flow; s3, allowing the medium-temperature air flow to flow through the cyclone blades, then entering a high-temperature Duan Keli collecting channel, and allowing particles to flow back to the bottom of the high-temperature section fluidization area through a high-temperature section particle descending annular cavity and a high-temperature section particle backflow channel to realize circulating heat exchange; S4, keeping a blocking plate in the low temperature Duan Dingbu in the transition section in a compressed and sealed state, enabling moderate temperature airflow to push the blocking plate in the bottom of the low temperature section to open, and enabling the blocking plate to enter a low temperature Duan Wenliu cavity through a through hole in the bottom of the low temperature section; S5, medium-temperature air flows through the low-temperature Duan Bufeng flow distribution plate to form evenly distributed uplink medium-temperature air flows, small-diameter fly ash particles at the upper part of the low-temperature Duan Bufeng flow distribution plate are blown up and subjected to fluidization heat exchange, so that the temperature of the small-diameter fly ash particles is increased, meanwhile, part of heat released by the medium-temperature air flows is converted into low-temperature air flows, and part of the low-temperature air flows carry the fly ash particles to flow through the concentration cone ring; s6, the fly ash particles are quickly turned after being acted by a concentration taper ring, enter a low-temperature Duan Keli collecting channel, and flow back to the bottom of a low-temperature section fluidization area through a low-temperature section particle descending annular cavity and a low-temperature Duan Keli backflow channel to realize circulating heat exchange; S7, the low-temperature air flow flowing through the concentration cone ring pushes the low-temperature Duan Dingbu outer shielding plate to open outwards, the low-temperature air flow flows into the low-temperature section air flow outer channel through the low-temperature Duan Dingbu outer through hole, and flows upwards from the low-temperature air inlet and outlet pipe, so that heat storage of the large-diameter and small-diameter fly ash particles is completed.
5. A method of fly ash fluidization heat release using the system of any one of claims 1 to 3, comprising the steps of: S1, low-temperature air flow to be heated flows in from a low-temperature air inlet and outlet pipe to push an outer shielding plate at the bottom of a low-temperature section to be opened inwards, and enters a low-temperature Duan Wenliu cavity through an outer through hole at the bottom of the low-temperature section; s2, enabling the low-temperature air flow to flow through a low-temperature Duan Bufeng flow distribution plate to form evenly distributed uplink low-temperature air flow, blowing small-diameter fly ash particles at the upper part of the low-temperature Duan Bufeng flow distribution plate, performing fluidization heat exchange, reducing the temperature of the small-diameter fly ash particles, and simultaneously enabling the low-temperature air flow to absorb heat and be converted into medium-temperature air flow; S3, allowing the medium-temperature airflow to carry fly ash particles to flow through a concentration taper ring, enabling the fly ash particles to rapidly turn and enter a low-temperature Duan Keli collecting channel after impacting the concentration taper ring at a high speed, and enabling the fly ash particles to flow back to the bottom of a low-temperature section fluidization area through a low-temperature section particle descending annular cavity and a low-temperature Duan Keli backflow channel to realize circulating heat exchange; S4, the medium-temperature air flow flowing through the concentration cone ring pushes the shielding plate in the low temperature Duan Dingbu to open outwards, and flows into the transition section through the through hole in the low temperature Duan Dingbu; s5, the middle temperature air flow pushes the outer shielding plate at the bottom of the high temperature section to open, through-hole outside bottom of high-temperature section enters a steady flow cavity of the high temperature section, flowing through the high-temperature section air distribution flow distribution plate; S6, the medium-temperature air flow forms evenly distributed uplink medium-temperature air flow, large-diameter fly ash particles at the upper part of the high Wen Duanbu air flow dividing plate are blown up, fluidization heat exchange is carried out, the temperature of the large-diameter fly ash particles is reduced, and meanwhile, the medium-temperature air flow absorbs heat and is converted into high-temperature air flow; s7, enabling the high-temperature airflow to carry fly ash particles to flow through the cyclone blades, enabling the fly ash particles to enter a high-temperature Duan Keli collecting channel, and enabling the fly ash particles to flow back to the bottom of a high-temperature section fluidization area through a high-temperature section particle descending annular cavity and a high-temperature section particle backflow channel to realize circulating heat exchange; S8, the high-temperature air flow pushes the inner shielding plate at the top of the high-temperature section to open outwards, the high-temperature air enters the high-temperature air inlet and outlet pipe through the inner through hole at the top of the high-temperature section, and the high-temperature air flows downwards from the high-temperature air inlet and outlet pipe to finish heat release of the large-diameter and small-diameter fly ash particles.

Description

Fly ash fluidization heat storage and release system and operation method Technical Field The present disclosure relates to a fluidized heat storage and release system capable of high-value utilization of fly ash and a control method of operating the system. Background Because renewable energy sources such as wind power, photovoltaic and the like are limited by natural conditions such as wind power, illumination and the like, the power generation capacity of the renewable energy sources fluctuates greatly along with time, and therefore an energy storage technology is needed to absorb intermittent and unstable renewable energy sources, so that the flexibility and the safety of the operation of a power grid are improved. In recent years, the fused salt and water heat storage mode is widely applied to the flexible peak shaving and clean heating projects of a thermal power plant, but the fused salt is high in price and high in system manufacturing cost and corrosiveness and easy to cause leakage in terms of energy storage materials, and the occupied area of the system is large (Wang Peng, luo Chending, giant star. Fused salt heat transfer and heat storage technology of the photo-thermal power station is applied to [ J ]. Electric power survey design, 2017 (2): 5). Meanwhile, the heat storage density is low, while the hot water is lower (Andrássy Z, Szánthó Z. Modelling of latent thermal energy storage systems [J]. International Review of Applied Sciences and Engineering, 2017, 8(1): 51–56.). The country with the highest yield of the fly ash in the world is the country with the highest yield of the fly ash, and the development of the fly ash high-valued product has great significance for the high-valued utilization of the fly ash. Because the fly ash particles can simultaneously meet the requirements of heat absorption, heat transfer and heat storage, the cost of the particles is low, and the cost of storage and transportation is low, thereby being expected to play an important role in the energy storage field. The documents disclosed by the patent office in China are searched, and no special device for realizing the energy storage and release of the fly ash is found. The existing fly ash treatment devices in China are studied, and most of the fly ash treatment devices adopt the airflow heat exchange of fly ash accumulation, or the fly ash is directly applied to the energy storage process of a power plant as a raw material, so that the energy storage and release efficiency of the existing fly ash is not high, the gradient utilization problem of fly ash fluidization heat storage is not solved, and the high-value utilization of the fly ash cannot be realized. Disclosure of Invention The fly ash fluidization heat storage and release system and the operation method thereof can realize high-value utilization of the fly ash, improve the heat storage and release efficiency of the fly ash, solve the cascade utilization problem of the fly ash fluidization heat storage, and have the advantages of compact equipment structure and flexible switching of air flow inlets and outlets. In a first aspect of the disclosure, a basic scheme of the fly ash fluidization heat storage and release system is given in detail first: the fly ash fluidization heat storage and release system comprises a high-temperature heat exchange section, a transition section and a low-temperature heat exchange section which are coaxially nested, wherein the sections are used for realizing fluidization heat storage and release of fly ash particles in a cooperative manner: The high-temperature heat exchange section comprises a high-temperature gas inlet and outlet pipe, a high-temperature section steady flow cavity, a high-temperature section particle reflux channel, a high-temperature section fluidization area, a high-temperature section particle collection channel, a high-temperature section separation ring, a high-temperature section outer cylinder, a swirl vane and a high-temperature section steady flow distribution cavity; the low-temperature heat exchange section comprises a low-temperature Duan Wenliu cavity, a low-temperature Duan Keli reflux channel, a low-temperature section particle downlink annular cavity, a low-temperature section fluidization area, a low-temperature Duan Zhongjian cylinder, a low-temperature Duan Keli collecting channel, a low-temperature Duan Natong, a low-temperature Duan Wenliu distribution cavity, a low-temperature gas inlet and outlet pipe, a low-temperature section outer shell and a low-temperature section gas flow outer channel; The low temperature Duan Natong is coaxially sleeved on the outer side of the high-temperature section outer cylinder; The transition section is sleeved on the outer side of the high-temperature heat exchange section and communicated with the high-temperature heat exchange section positioned on the inner side and the low-temperature heat exchange section positioned on the outer side, and the uppe