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A module-type fuel cell system including a power module includes a generator installed inside and a power housing having a plurality of connection holes formed sideward, wherein the generator generates electricity through an oxidation-reduction reaction of an oxidizing agent with a hydrogen-containi

A module-type fuel cell system including a power module includes a generator installed inside and a power housing having a plurality of connection holes formed sideward, wherein the generator generates electricity through an oxidation-reduction reaction of an oxidizing agent with a hydrogen-containing fuel; a fuel supply module including a fuel supply unit installed inside and a power housing having a plurality of connection holes formed sideward, wherein the fuel supply unit supplies a hydrogen-containing fuel to the generator; an oxidizing agent supply module including an oxidizing agent supply unit installed inside and an oxidizing agent supply housing having connection holes formed sideward, wherein the oxidizing agent supply unit supplies an oxidizing agent to the generator; and a recovery module including a storage space formed therein and a recovery housing having a plurality of connection holes formed sideward, wherein the storage space recovers an unreacted fuel generated in the generator, wherein the power module is closely attached and assembled in one side of the recovery module in a surface-to-surface contact manner, and the fuel supply module and the oxidizing agent supply module are closely attached and assembled in the other side of the recovery module in a surface-to-surface contact manner.

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What is claimed is: 1. A module-type fuel cell system comprising: a power module comprising a power housing, a generator installed therein, and a plurality of connection ports formed on a first side of the power housing and fluidly connected to the generator, wherein the generator is operable to ge

What is claimed is: 1. A module-type fuel cell system comprising: a power module comprising a power housing, a generator installed therein, and a plurality of connection ports formed on a first side of the power housing and fluidly connected to the generator, wherein the generator is operable to generate electricity through an oxidation-reduction reaction between an oxidizing agent and a hydrogen-containing fuel; a fuel supply module comprising a fuel supply housing, a fuel supply unit installed therein, and a plurality of connection ports formed on a first side of the fuel supply housing and fluidly connected to the fuel supply unit, wherein the fuel supply unit is configured to supply a suitable hydrogen-containing fuel to the generator; an oxidizing agent supply module comprising an oxidizing agent supply housing, an oxidizing agent supply unit installed therein, and a connection port formed on a side of the oxidizing agent supply housing and fluidly connected to the oxidizing agent supply unit, wherein the oxidizing agent supply unit is configured to supply an oxidizing agent to the generator; and a recovery module comprising a recovery housing comprising a first side and a second side, a storage space formed therein, and a plurality of connection ports on the first and second sides of the recovery housing and fluidly connected to the storage space, wherein the storage space is configured to recover unreacted fuel from the generator and accumulate the unreacted fuel in the storage space, wherein the first side of the power housing contacts and is secured to the first side of the recovery housing-, and the side of the fuel supply housing and the side of the oxidizing agent supply housing contact and are secured to the second side of the recovery module, and corresponding connection ports of adjacent modules align and form fluid connections therebetween and wherein tubes, including a fuel flow tube connecting the fuel supply module and the power module, extend through the storage space of the recovery module interconnecting the power housing and the fuel supply module and the oxidizing agent supply module to separate the fuel and the oxidizing agent from the recovered unreacted fuel. 2. The module-type fuel cell system according to claim 1, further comprising a heat exchange module comprising a heat exchange housing, a heat exchange unit therein, and a plurality of connection ports formed on a side of the heat exchange housing and fluidly connected to the heat exchange unit, wherein the heat exchange unit is operable to condense water vapor discharged from the power module. 3. The module-type fuel cell system according to claim 2, wherein the side of the heat exchange module contacts and is secured to the second side of the recovery module. 4. The module-type fuel cell system according to claim 3, further comprising a fuel storage module comprising a fuel storage housing configured for storing a hydrogen-containing fuel therein, and a connection port formed on a side of the fuel storage housing fluidly connected to a corresponding connection port on a side of the fuel supply module. 5. The module-type fuel cell system according to claim 4, wherein the side of the fuel storage housing contacts and is secured to a side of the fuel supply housing. 6. The module-type fuel cell system according to claim 5, wherein the corresponding connection ports of adjacent modules are hermetically connected. 7. The module-type fuel cell system according to claim 6, wherein a coupling is provided on each the connection port of the housing of a first module, and a socket dimensioned for connecting to the coupling is provided in each the connection port of the housing of a second, adjacent module. 8. The module-type fuel cell system according to claim 7, wherein the couplings and the sockets are shrink fit connectors and are coupled together. 9. The module-type fuel cell system according to claim 8, wherein the couplings and the sockets are integrally formed on each of the corresponding connection ports. 10. The module-type fuel cell system according to claim 6, wherein a shrink fit coupling is provided on the housing of a first module, and a fit socket corresponding to the shrink fit coupling is provided on the housing of a second, adjacent module. 11. The module-type fuel cell system according to claim 10, wherein the shrink fit coupling is coupled to the fit socket, thereby maintaining contact between the adjacent modules. 12. The module-type fuel cell system according to claim 1, wherein the assembled fuel supply module, recovery module, and power module form a fuel supply line comprising the fuel flow tube, a connection ports of the fuel supply module, and a connection port of the power module, wherein the fuel supply line fluidly connects the fuel supply module to the power module. 13. The module-type fuel cell system according to claim 12, wherein a connection port on the power housing of the power module is an unreacted fuel outlet configured for discharging unreacted fuel from the generator, and a corresponding connection port on the recovery housing of the recovery module is an unreacted fuel inlet. 14. The module-type fuel cell system according to claim 13, wherein a first connection port formed on a second side of the fuel supply housing of the fuel supply module is a fuel inlet configured for allowing inflow of a hydrogen-containing fuel, and a second connection port formed on the first side of the fuel supply housing is a fuel outlet corresponding to the fuel inlet of the recovery housing, the fuel outlet is configured for discharging a hydrogen-containing fuel, and the fuel supply housing comprises a fuel pump installed therein, fluidly connecting the fuel outlet with the fuel inlet. 15. The module-type fuel cell system according to claim 14, further comprising an oxidizing agent flow tube installed within and traversing the storage space of the recovery housing, the oxidizing agent flow tube fluidly connecting the power module with the oxidizing agent supply module. 16. The module-type fuel cell system according to claim 15, wherein the assembled oxidizing agent supply module, recovery module, and power module form an oxidizing agent supply line comprising the oxidizing agent flow tube, a connection port of the oxidizing agent supply module, and a connection port of the power module, wherein the oxidizing agent supply line fluidly connects the oxidizing agent supply module to the power module. 17. The module-type fuel cell system according to claim 16, further comprising a vapor flow tube installed within and traversing the storage space of the recovery module, fluidly connecting the heat exchange module with the power module. 18. The module-type fuel cell system according to claim 17, wherein the assembled power module, recovery module, and heat exchange module form a vapor supply line comprising the vapor flow tube, a connection port of the power module, and a connection port of the heat exchange module, wherein the vapor supply line fluidly connects the power module to the heat exchange module. 19. The module-type fuel cell system according to claim 18, wherein a connection port on a side of the heat exchange housing is a water outlet for water condensed in the heat exchange unit, and corresponding connection port on the second side of the recovery housing is a water inlet. 20. The module-type fuel cell system according to claim 19, wherein a connection port on the second side of the recovery housing is an unreacted fuel outlet for unreacted fuel, and a corresponding connection port on the first side of the fuel supply housing is an unreacted fuel inlet. 21. The module-type fuel cell system according to claim 20, wherein the fuel supply module further comprises a mixing tank fluidly connected to the unreacted fuel inlet and the fuel inlet installed therein, configured for mixing an unreacted fuel from the unreacted fuel inlet with a hydrogen-containing fuel from the fuel inlet. 22. The module-type fuel cell system according to claim 21, wherein the fuel supply unit further comprises an inlet fuel pump fluidly connected to the mixing tank and an outlet pump fluidly connected to the mixing tank. 23. The module-type fuel cell system according to claim 22, wherein a gas-liquid separator is provided at the top of the recovery module. 24. The module-type fuel cell system according to claim 23, wherein a gas-liquid separator is provided at the top of the heat exchange module. 25. The module-type fuel cell system according to claim 1, wherein the fuel flow tube in the recovery module fluidly connects a fuel inlet connection port and a fuel outlet connection port. 26. The module-type fuel cell system according to claim 25, wherein a connection port in the power housing is a fuel inlet corresponding to the fuel outlet of the recovery housing. 27. The module-type fuel cell system according to claim 26, wherein the fuel inlet of the power housing is fluidly connected to an anode electrode of the generator. 28. The module-type fuel cell system according to claim 14, wherein the connection port on the fuel storage housing is a fuel outlet corresponding to the fuel inlet of the fuel supply housing. 29. The module-type fuel cell system according to claim 15, wherein the oxidizing agent flow tube in the recovery module fluidly connects an oxidizing agent inlet connection port and an oxidizing agent outlet connection port. 30. The module-type fuel cell system according to claim 29, wherein a connection port on the power housing is an oxidizing agent inlet corresponding to the oxidizing agent outlet of the recovery housing. 31. The module-type fuel cell system according to claim 30, wherein the oxidizing agent inlet of the power housing is fluidly connected to a cathode electrode of the generator. 32. The module-type fuel cell system according to claim 29, wherein the connection port of the oxidizing agent supply housing is an oxidizing agent outlet corresponding to the oxidizing agent inlet of the recovery housing. 33. The module-type fuel cell system according to claim 17, wherein the vapor flow tube of the recovery module fluidly connect a vapor inlet connection port and a vapor outlet connection port. 34. The module-type fuel cell system according to claim 33, wherein a connection port on the power housing is a vapor outlet corresponding to the vapor inlet of the recovery module, and a connection port on the heat exchange housing is a vapor inlet corresponding to the vapor outlet of the recovery module.