30 results about "Solid particle erosion" patented technology

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 K_1C fracture toughness of at least 7.0 MPa-m ^1/2. 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.

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 static and moving blade used in supercritical and super-supercritical jet are made of 12%Cr heat resistant martensite steel and have the surface first boronizing treated with granular single phase boronizing agent to form one layer of single phase Fe2B structure combined firmly with the substrate and then tempering treated. The boronized layer has hardness as high as 1200-1600 HV, much higher than that of nitridated layer, and stable high temperature hardness. The present invention can meet the requirement of preventing solid particle erosion of supercritical and super-supercritical jet.

The invention discloses a chloridization corrosion resistant double-layer structure alloy coating for a heating surface of a garbage incinerator. The double-layer structure comprises a chloridizationcorrosion resistant bottom layer and a solid particle erosion resistant surface layer, wherein the chloridization corrosion resistant bottom layer comprises components in percentage by mass as follows: 20%-23% of Cr, 8%-10% of Mo, 3.15%-4.15% of Nb, 5% of Fe, 1% of Co, 0.5% of Mn, 0.5% of Si, 0.4% of Al, 0.4% of Ti and the balance of Ni and inevitable impurities; the solid particle erosion resistant surface layer comprises components in percentage by mass as follows: 80% of NiCr and 20% of Cr3C2; the chloridization corrosion resistant bottom layer in the double-layer structure coating is prepared with an activated combustion HVAF (high velocity air fuel) spraying process; the solid particle erosion resistant surface layer in the double-layer structure coating is prepared with an HVOF (highvelocity oxygen fuel) spraying process. The problems of pipe wall thinning and pipe explosion caused by the fact that the heating surface of the garbage incinerator is easily corroded by high-temperature chloride and eroded by solid particles are solved, and the service life and the maintenance cycle of pipes on the heating surface of the garbage incinerator are prolonged greatly.

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.

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.

Solid particle erosion in a steam turbine is minimized by diverting through angled slots formed in appendages of outer rings of the diaphragms, a portion of the steam from the steam flow path thereby bypassing downstream rotating components. The slot 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 slot 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 is thereby minimized.

The invention discloses an explicit algorithm for solid particle erosion in a liquid-phase elbow. The explicit algorithm comprises the following steps: (1) solving basic characteristics of a flow field in a pipeline; (2) solving an elbow internal flow field; (3) calculating drop points of the particles; (4) calculating the collision speed of the particles; (5) solving the collision angle of the particles; (6) solving a material loss ratio at a particle collision point; (7) solving the effective sand conveying rate at the particle impact position; (8) solving an inlet erosion diffusion coefficient; and (9) calculating solid particle erosion on the elbow. The invention aims to provide an explicit algorithm for calculating the motion trail of solid particles in a liquid-phase elbow and causing erosion, an approximate flow field in the elbow is constructed based on related theories, an explicit solution of the motion trail is obtained by simplifying a particle motion equation, and materialloss caused by collision of particles with a pipe wall is tracked.

The invention relates to a composite surface reinforcement method capable of considering erosion resistance and anti-fatigue property of a metal material, and belongs to the field of metal material surface coating layer and modification. The method comprises the following steps: firstly, pretreating the surface of a titanium alloy or steel sample by a high-energy ultrasonic finishing reinforcementtechnology to form a gradient structure on the surface layer of titanium alloy or steel and introduce a residual compressive stress layer; and then preparing a ceramic/metal composite structural coating by a plasma enhanced deposition technology. Through combination of the plasma enhanced deposition ceramic/metal laminated technology and the high-energy finishing enhancement technology, on one hand, the titanium alloy or steel is subjected to high-energy ultrasonic reinforcement treatment by a spherical tool head capable of rolling freely to obtain a gradient layer structure with low surfaceroughness (0.1 to 0.2 um), and on the other hand, a composite ceramic layer with solid particle erosion resistance more excellent than that of a titanium alloy or steel matrix is obtained by controlling the plating time and the cycle period of the composite coating metal layer and the ceramic layer.

A method for the surface treatment of ferritic/martensitic 9-12% Cr steels for the purpose of achieving an improved oxidation behavior and increased resistance to solid particle erosion at application temperatures of above 500° C., in particular around 650° C., in steam includes, in a first step, a known shot peening of the surface of the steel with steel particles, and, subsequently, in a second step, shot peening with glass particles, optionally, in a following third step, the surface of the steel being smoothed. A subsequent additional heat treatment is unnecessary.

The invention discloses a solid particle erosion resistant gradient multilayer protective coating which comprises a base body, a Ti layer deposited on the surface of the base body, a TiN layer deposited on the surface of the Ti layer and a TiAlN layer deposited on the surface of the TiN layer, the TiAlN layer comprises at least one stress absorption layer, and the stress absorption layer is a TiN-Ti-TiN layer of a gradient sandwich structure. The gradient multi-layer protective coating has high multi-angle resistance, high heat and high-strength erosion resistance. The invention further discloses a preparation method of the gradient multi-layer protective coating resistant to solid particle erosion. The operation process of the method is simple and easy to control, large-area uniform deposition is easy, and industrial production and application are facilitated.

The invention discloses a method for evaluating the comprehensive performance of a surfacing layer of a sealing surface of a valve seat, which comprises the following steps of: (1) determining the working temperature of the valve seat according to the purpose of the valve seat; (2) at the working temperature of the valve seat, performing a high-low temperature cycle test to obtain the fatigue resistance and high temperature resistance of the surfacing layer of the sealing surface of the valve seat; (3) performing a high-temperature impact test at the working temperature of the valve seat to obtain the impact resistance and high-temperature resistance of the surfacing layer of the sealing surface of the valve seat; (4) performing a high-temperature friction wear test at the working temperature of the valve seat to obtain the wear resistance and high-temperature resistance of the surfacing layer of the sealing surface of the valve seat; and (5) performing a high-temperature solid particle erosion test at the working temperature of the valve seat to obtain the erosion resistance and high-temperature resistance of the surfacing layer of the sealing surface of the valve seat. According to the evaluation method, whether the performance of the sealing surface surfacing layer reaches the standard or not is comprehensively evaluated through multiple performance tests, and an evaluation analysis method is provided for the valve seat sealing surface surfacing layer.

The invention discloses a device for realizing an erosion resistance test, which is characterized in that a stirrer is driven by a stepping motor to rotate so as to stir an erosion medium on a scraping disc, the erosion medium enters a funnel after being stirred by the stirrer and filtered by the scraping disc, airflow carries the erosion medium to flow out from a powder outlet pipe, then is sprayed out through a nozzle of a spray gun to an erosion sample on a movable sample table. Accurate quantitative supply of the erosion medium can be achieved by adjusting the rotating speed of the stepping motor, and by arranging a second gas inlet pipe provided with a heater, heated gas carries the erosion medium flowing out of the powder outlet pipe to be jetted to the to-be-eroded sample on the movable sample table, the erosion medium sprayed on the to-be-eroded sample is a heated erosion medium, and the erosion resistance test at a specific temperature can be realized, so that the solid particle erosion resistance test of a to-be-detected material from room temperature to high temperature can be met, and the quantitative evaluation of the erosion resistance of the material is realized.