Process flow for annual production of 300,000 tons of synthetic ammonia
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This post was last edited by snowdfr on 2009-5-30 16:00. Desulfurization and decarbonization in the synthetic ammonia production process with an annual capacity of 300,000 tons (Is it the low-temperature methanol washing process?) ）、transformation (is it a all-low transformation process? ), refining (is it a liquid nitrogen washing process? ) and the ammonia synthesis process (is it the Calhoun process? ) What are they each? The flowchart in the post at http://bbs.hcbbs.com/thread-193943-1-6.html is too complicated; I want a simple description of the process.
The process flow for the production of 300,000 tons per year of synthetic ammonia involves a medium-low pressure conversion process; desulfurization and decarbonization are carried out using the low-temperature methanol washing process; purification is done through liquid nitrogen washing; and the ammonia synthesis process employs the Cosali process
The following is a description of the preliminary process route and flow for a large-scale ammonia synthesis plant: This ammonia synthesis facility uses smokeless pulverized coal as raw material, and in accordance with the principles of advanced and energy-efficient processes, mature and reliable technology, as well as economic Rationality, it is capable of producing 500,000 tons of ammonia per year. The process scheme adopted is as follows: (1) Coal gasification: The GSP pressurized coal gasification process is used. (2) Transformation: The medium-string low-transformation process is adopted to save steam consumption. (5) Reformate purification: The most advanced low-temperature methanol washing process covered by domestic patents is employed. (6) The final purification of syngas is carried out using a liquid nitrogen washing process. (7) The syngas compressor is a centrifugal compressor unit driven by a fully condensed steam turbine, integrated with the cycle machine. (8) Ammonia synthesis employs the Cassali synthesis process, with two synthesis towers. Brief process description: The raw coal is crushed and dried, after which it is fed into the gasification furnace using high-pressure nitrogen. There, it burns together with high-pressure oxygen and steam to produce crude syngas containing CO and H2. This crude syngas is sent to the shift unit, where most of the CO reacts with water vapor to form H2 and CO2. Acidic gases such as CO2 and H2S in the syngas are removed in the low-temperature methanol washing unit. The resulting purified gas is then sent to the liquid nitrogen washing unit for further purification, so as to achieve a hydrogen-to-nitrogen ratio of 3:1 in the syngas. The purified gas enters the syngas compressor, where its pressure is increased to 15.0 MPa before it is fed into the ammonia synthesis system to produce ammonia.
Natural gas steam reforming process: 1. Hydrodesulfurization, cobalt-molybdenum hydrodesulfurization; 2. First-stage and second-stage steam reforming, nickel catalyst-based top-fired steam reforming; 3. High- and low-temperature shift reactions, iron-based and copper-based catalysts for CO conversion; 4. Decarburization, MDEA for CO2 absorption; 5. Methanation, nickel catalyst; 6. Synthesis, Casari shaft technology; 7. Cryogenic treatment; 8. Hydrogen recovery, cryogenic recovery
4# zyh924116 Natural gas steam reforming process: 1. Hydrodesulfurization, cobalt-molybdenum hydrodesulfurization; 2. First-stage and second-stage steam reforming, nickel catalyst-based steam reforming; 3. Upper and lower shift reactions, CO conversion using iron-based and copper-based catalysts; 4. Decarburization, CO2 absorption using MDEA; 5. Methanation, nickel catalyst; 6. Synthesis, Casari shaft technology; 7. Cryogenic treatment; 8. Hydrogen recovery, cryogenic recovery
1. Hydrodesulfurization: cobalt-molybdenum hydrodesulfurization with zinc oxide. 2. Steam reforming in stage one and two: nickel catalyst-based steam reforming. 3. Medium- and low-temperature reforming: CO reforming using iron-based and copper-based catalysts. 4. Decarburization: PSA adsorption. 5. Methanation: nickel catalyst. 6. Synthesis: one axis, three passes. 7. Cryogenic treatment
The feed gas after CO conversion and CO2 removal still contains a small amount of residual CO and CO2. To prevent poisoning of the ammonia synthesis catalyst, it is specified that the total content of CO and CO2 must not exceed 10 cm3/m3 (volume fraction). Therefore, the feed gas must be finally purified before entering the synthesis process
Powder coal gasification, low-temperature shift, low-temperature methanol washing for desulfurization and decarburization, low-temperature liquid nitrogen washing for purification, and Cassali medium-pressure ammonia synthesis technology.
What material are the valves used in gasification furnace equipment generally made of? It seems like it’s not a regular material when used in work.