MULTIPASS RADIANT SYNGAS COOLER WITH INTEGRATED SUPERHEATER
Publication Date: 2014-Sep-03
The IP.com Prior Art Database
This invention intends to improve the heat transfer efficiency in radiant syngas coolers by enhancing forced convection heat transfer which, along with radiation, may make the heat transfer surfaces more efficient. The instant configuration may enhance forced convection heat transfer through radiant syngas coolers by forcing the syngas through multiple annular passages formed between two sets of water tubes. The enthalpy of syngas left in the final pass can be used to superheat the steam.
One of the major challenges for a radiant syngas cooler (RSC) is to reduce the cost. Cost is sometimes driven by the height of RSC and the support structure cost. The present idea incorporates more radial layers of heat transfer areas to replace vertically placed areas and also improve heat transfer efficiency. Both these effects may result in height and material reduction leading to lower costs.
The flow of saturated steam through pipe lines and valves can pose potential condensation and erosion issues. One of the ways to mitigate this issue can be to superheat the steam.
The present idea is to make a more efficient and compact radiant syngas cooler and integrate the super-heater within it. Compact RSC configurations can be made by utilizing forced convection modes of heat transfer besides radiation. The configuration allows syngas to pass through narrow passages to make the forced convective heat transfer mode dominant. In the present concept, the number of flow passages defined is about three. The first passage is similar to existing configurations with platen tubes arranged in a radial segmented configuration and is expected to have a similar heat transfer mode and flow pattern. Natural convection (and radiation) is the predominant mode of heat transfer in the first passage. A small liquid pool is maintained at the bottom to collect the solids. Unlike existing configurations where the syngas enters in to the quench through the RSC cone, in this concept syngas is forced to pass in upward direction through an annular passage formed by the platen tubes and a second set of platen tubes. In the second set, the gaps are adjusted and velocities are maintained to ensure that the forced convection mode of heat transfer is enhanced. A sufficient gap is also maintained to avoid the effects of solids clogging the flow passage.
A bell shape structure is provided at the bottom and at the top to ensure that the deposition of fly ash particles is minimal. Syngas from the second pass takes a turn and flows through the annular gap formed between membrane tubes and second platen set. This defines the third pass of this innovation device structure. These membrane tubes constitute the...