Water heat-transfer shift process for by-product high-grade steam energy-saving deep conversion

Abstract

The invention relates to a water heat-transfer shift process for by-product high-grade steam energy-saving deep conversion. According to the process, a primary water heat-transfer shift converter and a secondary shift converter are adopted, CO in feed gas reacts with H2O to generate H2 and CO2 under the catalysis of a Co-Mo (copper-zinc) catalyst, and CO in shift gas coming out of a shift system is less than or equal to 0.1% (dry basis). In the process, CO is subject to deep conversion, the feed gas (containing water gas, semi-water gas, natural gas conversion gas or coke-oven gas conversion gas) utilization rate is high, the shift catalyst is not overheated, and the catalyst has a long service life; meanwhile, by-product saturated steam with the pressure of 0.5 to 9.0 MPa is generated, sensible heat and latent heat in the shift gas are further recovered by deoxygenated water and desalted water, low-grade heat energy is converted into high-grade heat energy, cooling water consumption is reduced, the temperature of` the shift gas coming out of a process system is lower than or equal to 40 DEG C, equipment is few, the flow is short, the investment is small, and the resistance is low (less than or equal to 0.05MPa).

Description

technical field [0001] The invention belongs to the field of raw material gas CO transformation in coal chemical industry, natural gas chemical industry, coal bed gas chemical industry and biogas chemical industry, and especially relates to pressurized pulverized coal continuous gas such as aerospace, coal water slurry Texaco, GSP, multi-nozzle, Shell (shell) and so on. The field of high water-gas ratio and high CO transformation produced by the furnace, the field of low water-gas ratio and high CO transformation produced by fixed-bed batch gasification, and the field of low water-gas ratio and high CO transformation produced by atmospheric pulverized coal continuous gasifier. In particular, a by-product high-grade steam energy-saving deep conversion water transfer heat conversion process. Background technique [0002] Currently, making CO and H 2 O generates CO 2 and H 2 achieve the conversion of CO into H 2 The purpose, the basic principle is: in the presence of cataly...

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Problems solved by technology

[0005] (2) It is difficult to determine the catalyst loading amount of the first-stage adiabatic converter: it is limited by the "activity coefficient (TF)": TF is an empirical value, and the data after actual application is required to check

When selecting the amount of catalyst for the "one-stage adiabatic converter", if the TF is selected to be large, the amount of catalyst will be less, and the conversion rate of the "one-stage adiabatic converter" will not meet the requirements, which will increase the load on the subsequent converter, and the heat energy recovery and design of the system The deviation between the values ​​is very large; if TF is small, the amount of catalyst used in the "one-stage adiabatic shift furnace" will be large, and the "one-stage adiabatic shift furnace" will be overheated (catalyst burnout is likely to occur), and methane will be brought Chemical side reactions increase and bring great safety hazards to system operation

[0006] (3) In addition, the existing adiabatic converter process still has the following defects: many equipments, long process routes, large project investment, large system resistance, many dew point corrosion points, high energy consumption in operation, and short service life of catalysts

[0009] (2) Due to the high water-gas ratio, the equilibrium temperature distance of the last stage adiabatic reaction is small, and the conversion system outlet CO ≥ 0.25% (dry basis), it is difficult to reduce to CO ≤ 0.10%, the raw material gas utilization rate is low, and the post-sequence load is increased and energy consumption

[0011] (1) The amount of steam entrained in the shift gas leaving the last catalyst bed is large, resulting in high steam consumption, which makes it difficult to recover the sensible heat and latent heat of the shift gas

[0012] (2) There is a lot of low-grade heat energy converted, and the overall process cannot be balanced, resulting in a large amount of waste of low-grade heat energy

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