论文部分内容阅读
本文系炼油厂加氢反应器不锈钢堆焊层器壁氢分布研究的一个部分,研究硫化氢加入后对不锈钢堆焊层及2 1/4CrlMo钢氢渗透的影响。本研究的介质条件为H_2+5％H_2S(体积百分比)、700°F、1500磅/英寸~2及850°F、2500磅/英寸~2。试样浸置在上述温度及压力的介质中,直至达到稳定渗透状态,再加入H_2S。控制试样中氢渗透量,至少经600小时,以评价在试样表面形成硫化物薄膜后对氢渗透速率所产生的影响。在2500磅/英寸~2、850°E下,氢中加入硫化氢(H_2S)使不锈钢堆焊层氢渗透速率比在纯氢下降低了35％。当将2 1/4CrlMo钢试样浸置在H_2+H_2S的工作条件下,在试样表面上形成的硫化物亦使氢渗透速率降低。在700°F、1500磅/英寸~2及850°F、2500磅/英寸~2的H_2+H_2S介质条件下经过600小时之后,氢渗透速率分别等于在相应温度及压力的纯氢介质条件下的83％和70％。从本研究所获得的数据可以计算堆焊了不锈钢复层的2 1/4CrlMo钢壳体中的氢分布。计算表明,由于硫化膜使堆焊层氢渗透速率降低,因而可以预料2 1/4CrlMo钢中氢含量会大大减少。
In this paper, a part of hydrogen distribution in the wall of stainless steel overlay in hydrogenation reactor of refinery is studied to study the effect of hydrogen sulfide on the hydrogen permeation of stainless steel overlay and 2 1 / 4CrlMo steel. Media conditions for this study were H 2 + 5% H 2 S (volume percent), 700 ° F, 1500 psi, and 850 ° F at 2500 psi. The sample is immersed in the medium of the above temperature and pressure until it reaches a stable state of penetration, then H 2 S is added. The amount of hydrogen permeation in the sample is controlled for at least 600 hours to evaluate the effect on the hydrogen permeation rate after the sulfide film is formed on the sample surface. Hydrogen sulfide (H 2 S) was added at hydrogen rates of 2,500 psi to 2,850 ° E to reduce the hydrogen permeation rate of stainless steel overlays by 35% compared to pure hydrogen. When the 2 1 / 4CrlMo steel sample was immersed in the H 2 + H 2 S working condition, the sulfide formed on the sample surface also reduced the hydrogen permeation rate. The hydrogen permeation rates after 600 hours at 700 ° F, 1500 psi, 2 ° F, 850 ° F and 2500 psi H 2 S were equal to those for pure hydrogen at the corresponding temperatures and pressures Of 83% and 70%. The data obtained from this study allow calculation of the hydrogen distribution in a 2 1/4 CrlMo steel shell clad with stainless steel cladding. Calculations show that hydrogen content in 2 1 / 4CrlMo steels can be greatly reduced due to the reduced hydrogen permeation rate of the overlay due to the sulphide film.