31 results about "Solid particle erosion" patented technology

Solid particle erosion in a steam turbine is minimized by diverting through holes in appendages of outer rings of the diaphragms, a portion of the steam from the steam flow path thereby bypassing downstream rotating components. The hole through the first stage appendage lies in communication with a passage through a downstream outer ring of a following stage such that the diverted solid particle containing steam may be extracted from the steam flow path and passed to the feed water heater of the turbine. The hole in the second stage appendage diverts steam from between the first and second stages and about the second stage. Solid particle erosion in various regions, i.e., the trailing edge of the stator vanes, along the surfaces of the buckets and in the regions of the cover and its connection with the buckets as well as the sealing devices are thereby minimized.

The present invention is directed to a method for protecting metal surfaces in oil & gas exploration and production, refinery and petrochemical process applications subject to solid particulate erosion at temperatures of up to 1000° C. The method includes the step of providing the metal surfaces in such applications with a hot erosion resistant cermet lining or insert, wherein the cermet lining or insert includes a) about 30 to about 95 vol % of a ceramic phase, and b) a metal binder phase, wherein the cermet lining or insert has a HEAT erosion resistance index of at least 5.0 and a K1C fracture toughness of at least 7.0 MPa-m1 / 2. The metal surfaces may also be provided with a hot erosion resistant cermet coating having a HEAT erosion resistance index of at least 5.0. Advantages provided by the method include, inter alia, outstanding high temperature erosion and corrosion resistance in combination with outstanding fracture toughness, as well as outstanding thermal expansion compatibility to the base metal of process units. The method finds particular application for protecting process vessels, transfer lines and process piping, heat exchangers, cyclones, slide valve gates and guides, feed nozzles, aeration nozzles, thermo wells, valve bodies, internal risers, deflection shields, sand screen, and oil sand mining equipment.

A solid particle erosion resistant surface treated coating has a solid particle erosion resistance that is largely enhanced and a rotating member having the coating gains oxidation resistance without deteriorating a fatigue strength. Also, a rotating machine can have this coating applied thereto. The solid particle erosion resistant surface treated coating has a nitrided hard layer formed on a surface of a base material and a PVD (physical vapor deposition) hard layer of at least one layer formed on the nitrided hard layer by a PVD method. Deformation of the base material by collisions by solid particles is prevented and cracking of the coating is prevented. Thereby, the solid particle erosion resistance is secured, life of the solid particle erosion resistant surface treated coating can be increased and oxidation resistance and fatigue strength are enhanced.

The present application provides a method of evaluating valve conditions in a turbine by a data acquisition system. The method may include the steps of receiving a number of operating parameters from a number of sensors, wherein the operating parameters may include steam temperatures determined over time and steam pressure, determining a steam chemistry, a throttling history, and a piping material, determining a probability of valve erosion based upon the steam temperatures determined over time, the steam chemistry, the throttling history, and the piping material, and altering one or more of the operating parameters and / or initiating repair procedures based upon the determined probability.

The invention discloses a solid particle pre-whirl mixing pneumatic acceleration device and method. An acceleration nozzle is of a contraction-straight pipe type or scaling type; the primary air flow generates moderate rotational flow before entering the acceleration nozzle through a specially-designed cyclone or a similar device; the solid particles are directly sprayed to the front part of the nozzle throat in an air flow carrying mode; the solid particles sprayed from a thin pipe are accelerated along the flow direction while generating radial diffusion under the dragging of the rotating air flow; the rotation kinetic energy of the air flow can be gradually dissipated under the mutual effect between the wall surface and the solid particles; the space distribution of the particles is dissipated along with the rotational flow and tends to be stable; and finally, a uniform high-speed air-solid two-phase jet flow is formed. The device and method disclosed by the invention can be used for improving the uniformity of the space distribution of the particles and the speed consistency of the particles, and are of great significance in improving the technology quality of the industrial production of a material thermal spraying technology, sand blasting and the like and improving the test precision of the scientific research field of solid particle erosion acceleration test and the like.