High temperature erosion-corrosion EC in coal gasification atmospheres CGA presents unique demands on material performance. Extensive screening of many engineering alloys in unique EC test apparatus at IITRI has generated a broad data base. These data were analyzed to provide a cogent summary for applications and future research. A laboratory testing procedure that simulates downtime corrosion in coal gasification plant has been developed. The test comprises alternate exposures of specimens that had previously been coated in char, to simulated coal gasification atmospheres CGA at high temperature and at ambient temperature. Results from the test have been. Jan 01, 1994 · High temperature corrosion tests were done for 1.25Cr-0.5Mo steel, 347H and 310S stainless steels in simulating the coal gasification atmospheres. The corrosion was increased with increase of H2S content for all steels tested and suppressed with increase of H2O content for stainless steels. 310S stainless steel showed the best corrosion resistance.
Materials considered for application in the high temperature gaseous environments that are present in various coal-gasification processes must be resistant to corrosive and erosive wear. The corrosion resistance of commercial grades stainless steels, Fe-base, Ni-base, and Co-base alloys and that of the pack coated alloys with Cr, Al, or Si were investigated in a simulated coal gasification atmosphere in the temperature range of 200 to 850°C for 100 to 500 hours. this paper major high temperature corrosion mechanisms, materials performance in presently op-erating gasifiers and future research needs will be discussed. Keywords: coal gasification, syngas coolers, sulfidation, downtime corrosion, stainless steel 1. Introduction Intensive development of gasification technology has. One of the main problems in oil refinery, carbochemistry, petrochemical units, carbon gasification, and energy generation in thermal power plants is the high-temperature corrosion occurring by the. Research should be directed to the effect of alloy and gas composition on corrosion mechanisms and kinetics in low moisture gas representative of entrained slagging gasification at high temperature reacting with metal surfaces at temperatures of 300-600 C. 1.
1993. Effect of gas composition and pressure on high temperature corrosion of various steels in coal gasification atmospheres. Materials at High Temperatures: Vol. 11, Materials for Coal Gasification Power Plant. Proceedings of the First International Workshop on Materials for Coal Gasification Power Plant, Petten, The Netherlands, June 14–16, 1993, pp. 65-69. Coal gasification technology is a process that converts coal or the combustible part of the coal tar at high temperature and pressure into flammable gas mainly composed of carbon monoxide and hydrogen. Coal water slurry gasification technology is one of the most widely used coal gasification technologies. Research on metallic corrosion in coalgasification atmospheres has primarily involved testing in high-Btu pilot plants or laboratory simulations thereof, although the near-term economic feasibility of low-Btu processes in combined-cycle electric-power production appears promising. Consequently, information on the operating parameters vessel pressures, gas compositions, and maximum.
ago, there has been a tremendous increase in the publications of high-temperature corrosion data and the emergence of new, challenging high-temperature corrosion and materials problems faced by several industries. Once thought to be a mandane fuel, household garbage under combustion. A state-of-the-art review is presented on the corrosion and mechanical behavior of materials at elevated temperatures in coal-gasification environments. The gas atmosphere in coal-conversion processes are, in general, complex mixtures which contain sulfur-bearing components hydrogen sulfide, SO2, and COS as well as oxidants carbon dioxide/carbon monoxide and water/hydrogen. Mar 10, 2016 · At 750°C alloy 800 H suffered breakaway corrosion and alloy 625 severe spallation. Alloys AC-66, III-TM and 45-TM showed superior corrosion resistance. Tests performed in a simulated coal gasification environment 1% H 2 S, 4% CO, 3% H 2 0, balance H 2 showed negligible mass gain for the alloys at 550°C. Results at 650°C remained satisfactory after 1000 h for alloys 800 H, AC-66, III-TM. All surfaced substrates had better corrosion resistance than the unprotected substrates when exposed for 1000 hours in a coal gasification atmosphere CGA at 982/sup 0/C 1800/sup 0/F. The extent of corrosion attack observed on the unprotected substrates.
Aug 11, 2011 · Infiltration characteristics of industrial coal slag into alumina Al 2 O 3 refractory material with a temperature gradient induced along the slag's penetration direction are compared to those obtained under near‐isothermal conditions.Experiments were conducted with a hot‐face temperature of 1450°C and a CO/CO 2 ratio of 1.8, which corresponds to an oxygen partial pressure of ~10 −8 atm. HIGH TEMPERATURE STRUCTURAL MATERIALS J.D. Venables Consultant on Advanced Materials, USA Keywords: high temperature materials, materials science, computational materials science, superalloys, ceramics, high temperature fuel cells, coal gasification, environment Contents 1. Introduction 2. Review of Current High Temperature Structural Materials. The results of studies on corrosion chemistry in low-oxygen activity atmospheres that are characteristic of gasified or incompletely combusted coal are given. The objective was to identify those factors in alloy composition and structure and in gas composition and temperature that govern both the formation and eventual breakdown of protective-oxide scales in low-P sub O 2 to high-P sub S 2. High Temperature Corrosion Resistance of Some Metallic Materials in Low-BTU Coal Gasification Pilot-plant. also found that alloys with lower chromium contents such as 2.25Cr-1Mo steel and SUS410 are hardly applicable for the coal gas atmosphere. SUS347 gave comparatively good results rather than the other austenitic stainless steels.
High-temperature corrosion reactions were analyzed from a thermodynamic equilibrium point of view. The equilibrium pressure of sulfur, oxygen, nitrogen and carbon in the gas will determine which condensed phases can stand in equilbrium with the gas. the problem of high temperature hot corrosion of materials. The design of gas turbines, jet engines, coal gasification facilities and other high temperature equipment for service beyond present operating temperature limits is severely limited by materials availability. One typical example is. Studies of the high-temperature corrosion of metallic and ceramic materials are being conducted in simulated coal-gasification atmospheres and coal-combustion environments typical of conventional pulverized coal-fired boilers, fluidized-bed systems, and low. In previous investigations on the high-temperature corrosion of aluminium nitride by coal ash  AlN materials were tested in basic and acidic coal ashes at temperatures of 900 °C to 1300 °C.
Abstract. Corrosion of metallic materials by coal gasification atmospheres has been the subject of extensive study for over 20 years. While many alloys were found to be resistant to attack by high moisture content gases representative of fluidized bed gasifiers at temperatures up to 900 °C, good resistance could not be sustained for more than a few thousand hours as a result of changes in the. Materials Problems in Fluidized-Bed-Combustion and Coal-Gasification Systems: Further Studies of Corrosion Chemistry in Low-Oxygen Activity Atmospheres. Final Report. DE82905772. In this paper, the products using three kinds of coal gasification slags as starting materials were obtained via carbothermal reduction-nitridation at 1450 °C. The effects of high-temperature liquid on the phase composition and morphology of the samples were investigated by XRD and SEM, while the content of high-temperature liquid was calculated by the computer software package FactSage. Corrosion of metallic materials by coal gasification atmospheres has been the subject of extensive study for over 20 years. Research should be directed to the effect of alloy and gas composition on corrosion mechanisms and kinetics in low moisture gas representative of entrained slagging gasification at high temperature reacting with metal.
CiteSeerX - Document Details Isaac Councill, Lee Giles, Pradeep Teregowda: Abstract.- The effect of chlorine in coal gasification atmospheres was investigated on the high temperature corrosion of Incoloy 800H coated with SO2. The experiments were performed in a representative gas mixture between 450 and 750 OC. The weight gain in this environment was significantly decreased with coating. Read "Corrosion of Commercial Stainless Steel AISI310 and of a V-Modified Fe-Ni-Cr Model Alloy in Coal Gasification Type Atmospheres at 600°C, High Temperature Materials and Processes" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
In this paper major high temperature corrosion mechanisms, materials performance in presently operating gasifiers and future research needs will be discussed. Keywords: coal gasification, syngas coolers, sulfidation, downtime corrosion, stainless steel. Under the highly sulfiding conditions of the high temperature coal gas, the performance of components degrade significantly with time unless expensive high alloy materials are used. The ash fusion temperatures AFTs of 21 typical Chinese coal ash samples and 60 synthetic ash samples were measured in Ar and H2 atmospheres. The computer software package FactSage was used to calculate the temperatures corresponding to different proportions of the liquid phase and predict the phase equilibria of synthetic ash samples. Empirical liquidus models were derived to correlate the. Behaviour of Fecralloy and Iron Aluminides Alloys in Coal Gasification Atmospheres Containing HCI p.583 Corrosion Behaviour of some Fe-Base Alloys in H 2 -H 2 O and H 2.
However, to ensure that ash is discharged in a melting state after gasification, the flow temperature FT of ash is required to be lower than 1380°C. 5, 6 However, the reserves of high ash fusion temperature AFT, FT > 1400°C coal are huge accounting for about 57% in China. 7 The AFTs were mainly depending on the operating conditions. The corrosion resistances of AISI 347H and 310 stainless steels SSs, 35Cr-45Ni steel, and chromized and aluminized AISI 347H SS were evaluated in simulated coal gasification atmospheres at 550, 600, and 650 C. The scales formed were mainly sulfides, with a small amount of oxides. that are being developed are mainly based on coal gasification and/or combustion, with associated gas cleaning technologies to meet system and emission requirements. The gasification procedure generates very aggressive atmospheres. The gas streams contain CO, CO 2, H 2 S, SO 2 and H 2 O, that result in corrosion. an erosion-corrosion environment. A few workers have studied the high-temperature corrosion behavior of stainless steels [1-3]. For example, Fujikawa et al.  found that 347 stainless steel showed better resistance to high temperature corrosion due to the Cr-rich spinel oxide formed in the vicinity of metal/scale interface than other. II. Exposure of 304L and 310S in chlorinating gasification environments R. Elger, F. Lindberg, R. Norling, R. Pettersson, Materials at High Temperatures, 32 1-2, 36-43, 2015. III. Corrosion and deposit formation on four steels in the syngas section after a biomass gasifier R. Elger, R. Norling, R. Pettersson, Materials and Corrosion.
A critical item of equipment that encounters metal dusting corrosion is a boiler where the operating temperature zone is in the range 400-800°C. Nickel alloys The use of high nickel, high chromium alloys is preferred as they have much better corrosion resistance. Testing can be performed in corrosive reaction atmospheres and, as no porous material is in contact with the atmosphere, changing of the reaction gas is clean, fast, and without any memory effects. The Discovery HP-TGA is the only high pressure TGA to feature Curie-point temperature calibration at any pressure and with any reaction gas.
environments, high temperature erosion-corrosion of metals, and molten slag effects on refractories. Results from two areas, the effect of ash deposits on alloy corrosion and thermal gradient effects on the corrosion of metals, will be highlighted. Ash produced in coal gasifiers, coal combustors, and waste combustors, when deposited on metal. Gasification is a process that converts organic- or fossil fuel-based carbonaceous materials into carbon monoxide, hydrogen and carbon dioxide.This is achieved by reacting the material at high temperatures >700 °C, without combustion, with a controlled amount of oxygen and/or steam.The resulting gas mixture is called syngas from synthesis gas or producer gas and is itself a fuel.
The LINSEIS High Pressure STA Simultaneous Thermal Analysis delivers unsurpassed performance.The system can be used to determine simultaneous changes of mass TG and caloric reactions HDSC under defined atmosphere and pressure up to 50/150 bar in the temperature range -170°C up to 1800°C.This instrument is unique because it is the only available pressure STA worldwide.
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