| 摘要 |
A nozzle suitable for use with a device for removal of deposits from contaminated surfaces, such as a sootblower in a heat recovery boiler, is designed to avoid normal shock wave formation, and hence energy dissipation, by achieving a condition whereby, the emergent steam pressure (pe) is related to the ambient pressure (p INFINITY ) by the relationship pe/p INFINITY <about 2, preferably about 1. A compact design achieving this result and able to function over a wide range of flow rates comprises a cylindrical body (32) with a downstream convergent outlet (38) and rounded-head conical insert (40) located axially in the body with its maximum dimension generally coinciding with the commencement of convergence of the outlet and extending through the outlet. <IMAGE>
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