In the field of modern coal chemical industry, the air separation plant mainly provides oxygen and nitrogen. Oxygen is mainly used as gasification agent and reaction raw material, while nitrogen of different pressure levels is used as raw material nitrogen, inertia protective gas, pneumatic conveying gas and purging gas. In the past, air, oxygen-enriched or low-pressure pure oxygen were basically used as gasification agent in the domestic coal chemical industry, and the gasification efficiency, carbon conversion rate and gasification furnace capacity were all very low. With the progress of coal gasification technology, modern coal gasification is becoming high pressure (4 Mpa ~ use, reduce the compression energy consumption of synthetic gas or realize isobaric synthesis, and reach 15 MPa) and large-scale development, so as to realize efficient energy recovery, the 2200 type project of small and medium-sized complete air separation equipment ordered by DEAR air separation and clients, combined with the actual situation of the project, meets the production demand of the enterprise.
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Solution advantages |
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This unit adopts molecular sieve purification, pressurized turbine expansion machine to supply the unit with cooling capacity, and at the same time adopts double-tower and double-condensation nitrogen production process, and the extraction rate of nitrogen production reaches about 70%: 1. Good security The whole set of equipment has low operating pressure, simple process, high level of equipment safety, long switching cycle of molecular sieve system, longer service life of switching valve and reducing potential safety hazard. 2. High reliability Use water chilling unit to reduce the malfunction of dynamic equipment. 3. Convenient operation and maintenance, simple craft |
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Product |
Output N m & sup3;/h |
Purity |
Outlet cold box pressure Mpa |
Temperature |
Note |
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Nitrogen gas |
2200 |
≤10ppmO2 |
0.25 |
Normal temperature |
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Liquid nitrogen |
80 |
≤10ppmO2 |
Inlet storage tank |
Saturated |
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Note: measurement unit Nm3/H is measured at 0℃, 0.1013Mpa (A). It is called standard state quantity.
1.1 take oxygen and nitrogen at different times
1.2 Operation Cycle (interval between two big heating): ≥2 years
1.3 heating and cooling time of the unit :~ 24-hour
1.4 start-up time of the device (from the start of the expansion machine to the purity index of the oxygen product ):~ 20 hours
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Supporting unit |
Unit |
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1. Centrifugal air compressor 2. Air precooling system 3. Purification system 4. Booster turbine expansion unit 5. Distillation column system 6. Liquid storage system 7. Instrument control system 8. Electronic control system |
1 Set 1 Set 1 Set 1 Set 1 Set 1 Set 1 Set 1 Set |
