The use of coal tar hydrogenated exhaust gas has been identified

Extraction of hydrogen purity of more than 99.6%
December 8, Shaanxi DongxinYan Chemical Co., Ltd. independently developed coal tar hydrogenation waste gas recycling technology and industrial applications, in Xi'an by the Shaanxi Province Petroleum and Chemical Industry Federation organized by the scientific and technological achievements of identification. According to the appraisal committee, which is led by Li Jinghong, a professor at Northwestern University's School of Chemical Engineering, the technology has realized the efficient and rational utilization of hydrogen in the exhaust gas emitted by coal tar hydrogenation plant, and obtained valuable and scarce hydrogen resources, reaching the leading domestic level.
, the hydrogen recovered by this technology meets the hydrogen quality requirements of the coal tar hydrogenation process, which greatly improves the utilization rate of hydrogen
China
. "In response to the shortage of hydrogen in production facilities and underutilized, we mix the exhaust gas generated in coal tar hydrogenation with the non-transformable waste gas, through the washing salt, temperature absorption pre-treatment desulfurization process, integrated PSA variable pressure adsorption and vacuum desorption hydrogen core technology, so that the extracted hydrogen purity of more than 99.6%." Dong xinxuan company responsible person said.according to
, Dongxin Yan company 500,000 tons / year coal tar hydrogenation plant originally designed hydrogen consumption of 25,000 standard cubic meters / hour, the previous hydrogen system maximum hydrogen lifting volume does not exceed 14,000 standard cubic meters / time, due to insufficient hydrogen production plant hydrogen, seriously restricting the increase of coal tar hydrogenation plant capacity. The hydrogenation device high and low pressure separator emissions of the exhaust gas content of about 80%, and coking device output of the rich gas as a heating furnace fuel combustion. When the fuel is surplus in the heating furnace, hydrogen-containing exhaust gas can only be burned by high-pressure torch, resulting in energy waste and environmental pollution.
East Xinxuan Company, relying on its own technical strength, set up a research team to carry out a serious analysis and research on the exhaust gases emitted by the hydrogenation device high and low pressure separators, with the purpose of recycling hydrogen to carry out technical research. In June 2017, the team formulated a plan for the recovery and transformation of coal tar hydrogenated exhaust gas, completed the technical transformation of the plant in July of the same year, and introduced the exhaust gas into the PSA variable pressure adsorption pretreatment system mixed with pressurized non-converted gas, ammonia and ammonium salt Washing tower into the TSA temperature adsorption to remove hydrogen sulfide and light hydrocarbons and other substances, and then into the thickening, purification section for purification, the hydrogen purity of more than 99.6%, can be used as a hydrogenation plant production raw materials. In June of this year, the project also aimed at the hydrogen production plant hydrogen yield is low, adsorbent regeneration effect is poor, the implementation of hydrogen plant equipment modification and process optimization, so that hydrogen production of oxygen-containing hydrogen plant from 14,000 standard cubic meters / hour to 23,000 to 28,000 standard cubic meters / hour, the daily production of oil from the original more than 500 tons to more than 1000 tons.
appraisal opinion, coal tar hydrogenation waste gas recovery technology advanced and feasible, economic and environmental benefits are significant, with good value for popularization and application. According to statistics, as of the end of November 2018, coal tar hydrogenation plant has been running safely and steadily for more than 600 days. After the technical transformation of hydrogen production from exhaust gas recovery, the device can increase the annual production of oil by 198,000 tons, according to the average oil price of 5500 yuan / ton calculation, the annual increase in output value of 108.9 million yuan, profit of 49.5 million yuan.