| 摘要 |
A compact gas fired steam generator comprises a steam separation chamber integrated with vertical fin tubes, a down comer tube and a tube header immersed in a thermally insulated firebox chamber provided with horizontally firing gas burners, a condensing heat exchanger for recovery of the waste heat from flue gases to preheat the feed water and the return condensate and a heat exchanger to recover waste heat from the blow down boiling water to the incoming feed water, all enclosed in a thermally insulated casing.The steam is produced in said vertical fin tubes by boiling and evaporating a recirculating boiling water by the heat transferred to the boiling water from hot combustion gases produced in said firebox chamber, with said produced steam being separated from the recirculating boiling water in said steam separation chamber. The water level in the steam separation chamber is maintained by the continuous production of steam and flow of feed water and the concentration of dissolved and suspended solids in the recirculating boiling water is maintained by a continuous overflow of a small portion of the boiling water.The high rate internal reticulation of boiling water, the extended heat transfer surfaces of the vertical fin tubes and the effective contact of the combustion gases with the extended heat transfer surfaces provide an exceptionally compact steam generator offering ultrahigh thermal efficiency and substantionally maintenance free unattended operation.The compact steam generator can be used in humidification of air, in various heating applications and in industrial processes requiring clean steam.
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