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CN-122025685-A - Tubular SOFC fuel cell stack with waste heat utilization

CN122025685ACN 122025685 ACN122025685 ACN 122025685ACN-122025685-A

Abstract

The invention relates to the technical field of fuel cells and discloses a tubular SOFC fuel cell stack with waste heat utilization, which comprises a metal cover and a cell unit, wherein the cell unit is fixedly connected in the metal cover and consists of at least one group of anode half cell units and cathode half cell units, the anode half cell units and the cathode half cell units are mutually staggered and are closely arranged along a chessboard mode, so that the outer surface area of the anode half cell units and the cathode half cell units is obviously increased, a larger effective reaction area is provided for an electrode-electrolyte interface, an electron transmission path between adjacent units is changed from traditional 'transmission along the tube axis direction' to 'short-distance transverse transmission', the length of the electron flow path is obviously shortened, the integral internal ohmic resistance of the stack is reduced, and meanwhile, as each half cell unit forms an independent fuel gas or air flow path, the number of intermediate current collecting parts is reduced, and the structural integration level of the stack is improved.

Inventors

  • WANG CHENFANG
  • YIN HUAN
  • HUANG ZIYI
  • ZHOU TAOTAO
  • ZHANG XIANWEN
  • ZHANG YU

Assignees

  • 合肥工业大学

Dates

Publication Date
20260512
Application Date
20260318

Claims (10)

  1. 1. The utility model provides a tubular SOFC fuel cell stack with waste heat utilization, includes metal cover (1), its characterized in that, the both sides of metal cover (1) are all fixedly connected with ring flange (2), still include: the battery unit is fixedly connected in the metal cover (1) and consists of at least one group of anode half battery units (3) and cathode half battery units (31), The fuel pipe (4) and the air pipe (41) are respectively and fixedly connected to the flange plates (2) at the two sides, and are respectively communicated with the two ends of the inner cavity of the metal cover (1); and the preheating part is arranged on the metal cover (1) positioned at one side of the air pipe (41), and the preheating part preheats the air pipe (41) through high-temperature tail gas generated by combustion in the battery unit.
  2. 2. The tubular SOFC fuel cell stack with residual heat utilization according to claim 1, wherein the anode half cell unit (3) and the cathode half cell unit (31) are of square design, are staggered and tightly attached, the anode half cell unit (3) and the cathode half cell unit (31) are hollow, and two ends of the anode half cell unit are provided with openings and are communicated with the inner cavity of the metal cover (1).
  3. 3. The tubular SOFC fuel cell stack with residual heat utilization according to claim 1, wherein the outer surfaces of the anode half cell unit (3) and the cathode half cell unit (31) are coated with an electrolyte layer (32), and the anode half cell unit (3) and the cathode half cell unit (31) are made of ceramic substrates.
  4. 4. A tubular SOFC fuel cell stack with waste heat utilisation according to claim 3, wherein the ceramic substrate is filled with a metallic conductive material, and the metallic conductive material is in the form of porous foam.
  5. 5. The tubular SOFC fuel cell stack with waste heat utilization according to claim 1, wherein the preheating part comprises a preheating bin (5), the preheating bin (5) is fixedly connected to the side wall of a flange plate (2) provided with an air pipe (41), the preheating bin (5) is communicated with the inner cavity of the metal cover (1), an exhaust hole (51) is fixed on and communicated with the side wall of the preheating bin (5), and the penetrating part of the air pipe (41) and the preheating bin (5) is sealed by insulating high-temperature-resistant packaging adhesive.
  6. 6. The SOFC fuel cell stack with the tube type waste heat utilization according to claim 5, wherein the joints of the fuel tube (4), the air tube (41) and the flange plate (2) are all sealed by insulating high-temperature-resistant packaging adhesive, the joints of the flange plate (2), the metal cover (1) and the preheating bin (5) are filled with insulating high-temperature-resistant packaging adhesive, and the metal cover (1), the preheating bin (5) and the fuel tube (4) are all surrounded by heat-resistant heat-insulating materials.
  7. 7. A tubular SOFC fuel cell stack with waste heat utilisation according to claim 2, wherein the main material of the ceramic substrate of the anode half cell unit (3) is a nickel-yttria stabilised zirconia cermet.
  8. 8. A tubular SOFC fuel cell stack with waste heat utilisation according to claim 2, wherein the main material of the ceramic substrate of the cathode half cell unit (31) is strontium doped lanthanum manganate cermet.
  9. 9. A tubular SOFC fuel cell stack with waste heat utilisation according to claim 3, characterised in that the electrolyte layer (32) material is an oxide with oxygen ion conductivity at high temperature.
  10. 10. A tubular SOFC fuel cell stack with waste heat utilisation according to claim 9, wherein the electrolyte layer (32) material is yttria stabilised zirconia with a mole fraction of yttria of 3% -8%.

Description

Tubular SOFC fuel cell stack with waste heat utilization Technical Field The invention relates to the technical field of fuel cells, in particular to a tubular SOFC fuel cell stack with waste heat utilization. Background Solid Oxide Fuel Cells (SOFC) have been developed as an efficient and environment-friendly energy conversion device for about 120 years, and since SOFC concepts have been proposed in the end of the 19 th century, the technology has evolved continuously, the 1960 s, fuel cells break through the material limitations and develop a commercializable cell system, in 1991, the German Siemens company has introduced SOFC product formats, after 21 th century, SOFC technologies have been gradually commercialized, in 2010, the United states has introduced the first-class commercial SOFC products in the world, and the market breakthroughs of SOFC technologies are marked. The conventional SOFC stack generally adopts a flat plate type or circular tube type structure, the flat plate type SOFC is connected in series through bipolar plates to form the stack, although the single-plate type SOFC has larger reaction area, the problems of complex structure, high airtight packaging difficulty, failure of any cell unit, failure of the whole stack and the like exist, the transmission paths of electrons and oxygen ions in the flat plate type SOFC are longer, the ohmic resistance is obviously increased after the number of stacked layers is increased, the further improvement of the power density is limited, the circular tube type SOFC has certain advantages in the aspects of tightness and thermal cycle reliability, the effective reaction area of a cylindrical structure in unit volume is limited, and a large ineffective space exists between the tubes, so that the overall volume power density of the system is lower. Therefore, a tubular SOFC fuel cell stack with waste heat utilization is proposed. Disclosure of Invention The invention provides a tubular SOFC fuel cell stack with waste heat utilization, which is characterized in that the outer surface area of the SOFC fuel cell stack is obviously increased by the way that anode half cell units and cathode half cell units are mutually staggered and are closely arranged along a chessboard-shaped mode, so that a larger effective reaction area is provided for an electrode-electrolyte interface, an electron transmission path between adjacent units is converted from traditional 'transmission along a tube axis direction' to 'short-distance transverse transmission', the length of an electron flow path is obviously shortened, the integral internal ohmic impedance of the stack is reduced, and the problems that the airtight packaging difficulty of the conventional stack is high, the transmission paths of electrons and oxygen ions are longer, the ohmic impedance is obviously increased, the circular tube type space utilization rate is low, and the integral volume power density of the system is lower are solved. The invention provides the following technical scheme: The tubular SOFC fuel cell stack with the waste heat utilization comprises a metal cover, a cell unit, a preheating part and an air pipe, wherein the flange plates are fixedly connected to two sides of the metal cover, the cell unit is fixedly connected in the metal cover and consists of at least one group of anode half cell unit and cathode half cell unit, the fuel pipe and the air pipe are respectively and fixedly connected to the flange plates at two sides and are respectively communicated with two ends of an inner cavity of the metal cover, the preheating part is arranged on the metal cover at one side of the air pipe, and the preheating part is used for preheating the air pipe through high-temperature tail gas generated by combustion in the cell unit. As a preferable technical scheme of the invention, the anode half battery unit and the cathode half battery unit are both in square design, are staggered and tightly attached, are hollow, and are provided with openings at two ends and are communicated with the inner cavity of the metal cover. As a preferable technical scheme of the invention, the outer surfaces of the anode half-cell unit and the cathode half-cell unit are respectively coated with an electrolyte layer, and the anode half-cell unit and the cathode half-cell unit are respectively made of ceramic substrates. As a preferable technical scheme of the invention, the ceramic substrate is filled with a metal conductive material, and the metal conductive material is porous foam. As a preferable technical scheme of the invention, the preheating part comprises a preheating bin which is fixedly connected to the side wall of a flange plate provided with an air pipe, the preheating bin is communicated with the inner cavity of the metal cover, the side wall of the preheating bin is fixedly communicated with an exhaust hole, and the penetrating part of the air pipe and the preheating bin is sealed by insulating high-temp