Method for the adsorptive drying of purified biogas and for regenerating laden adsorbents
An adsorption drying and adsorbent technology, applied in chemical instruments and methods, biochemical equipment and methods, through adsorption, etc., can solve problems such as large safety risks, and achieve the effect of improved removal
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example 1
[0025] A: dry:
[0026] Biogas generated from biowaste in fermenters is purified to release unwanted secondary components and the presence of carbon dioxide is removed by means of ambient pressure amine scrubbing. 3 (STP) / h is drawn from the scrubber. The biomethane gas has the following composition:
[0027]
[0028] The biomethane gas withdrawn via line 1 is cooled to about 22°C in the first heat exchanger W1 and then sent via line 2 downstream, to the second heat exchanger W2, where it is cooled to 5°C. This can change the water content of biomethane gas from the original 19500mg / m 3 (STP) decreased to 5035mg / m 3 (STP). Via lines 9 and 10, the separated water is removed to an optional storage intermediate vessel not shown and sent back to the biogas production or purification process.
[0029] The amount of biomethane gas is reduced to 28.99m 3 (STP) / h.
[0030] The composition of the biomethane gas discharged via line 3 has been changed as follows:
[0031] CH ...
example 2
[0049] The regeneration of the filled absorption tower was carried out under the same conditions as in Example 1, during the first hour, the lower part of the absorption tower (up to a height of about 300 mm) was carried out with a liquid heating carrier having a temperature of 150° C. Extra heating. At the same time, as in Example 1, the dried biomethane at a temperature of about 120°C and a pressure of 40 mbar is 3 / h through the bed of the absorption tower.
[0050] Indirect additional heating speeds up the drying process of the silica gel bed which includes a larger proportion of water or moisture.
[0051] Since the heating of the absorber has already removed part of the moisture present in the silica gel, the heat in the drying gas (biomethane) can be used more effectively for further drying of the bed, since the adsorber has been heated in a maximum proportion by indirect The area where the moisture is present is heated.
[0052] After a drying time of about 8 hours,...
example 3
[0056] Under the same conditions as in Example 2, the regeneration temperature is now increased from 120 to 140°C.
[0057] Under these conditions, the water content of the dried biomethane gas ranged from 50 to 80 mg / m in 10 hours 3 (STP), then increased to 160 mg / m within 1 hour 3 (STP).
[0058] This shows that although the energy consumption is higher than Example 2, only a small improvement in drying is achieved. In cases where higher regeneration temperatures are used, the adsorbent bed is damaged. The drying gas rate increased by 5 to 10m through line 4 3 (STP) / h, which reduces the water content of the dried biomethane to 40 to 70 mg / m in the first 10 hours 3 (STP), but requires twice the regeneration energy.
[0059] Compare with Example 1
[0060] In contrast to Example 1, the moist biomethane was dried with only one bed consisting of 55 liters of silica gel with a pore size of 25 nm.
[0061] Under the same conditions as in Example 1, the breakthrough of moi...
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