Treatment of semi-carbonized gas

Abstract

The torrefaction gas treatment device 400 makes it possible to chemically recycle torrefaction gas 202 produced from solid recovered fuel (SRF) pellets 117, etc. by torrefaction, without the need to combust the torrefaction gas 202.

Claims

1. A method for treating semi-carbonized gas (202) generated by the semi-carbonization of solid recovered fuel pellets (117) produced from municipal waste, The aforementioned semi-carbonized gas (202) is In the combustion chamber (402), the oxygen-rich gas (404) containing at least 95 volume percent oxygen and the fuel gas (403) are oxidized quasi-stoichiometrically. As a result, larger hydrocarbon molecules derived from the semi-carbonized gas (202) or the fuel gas (403) or both are thermally decomposed to generate synthesis gas (407, 401). The synthesis gas (407) is rapidly cooled by bringing a stream of recycled synthesis gas (406), which has a lower temperature than the synthesis gas (407), into contact with the synthesis gas (407). method.

2. The method according to Claim 1, The rapidly cooled synthesis gas (409) is supplied to the heat recovery system (410), and the following heat transfer occurs. a) Heating the heat transfer medium (411), b) Generating high-pressure steam (413) from boiler feedwater (412), c) Superheating low-pressure steam (415) A method in which at least one of the following is performed.

3. The method according to claim 1 or 2, The rapidly cooled synthesis gas (409) is purified in a wet washing system (417). method.

4. The method according to claim 3, The first portion of the purified synthesis gas (420) is used as the recycled synthesis gas (406). method.

5. The method according to claim 3 or 4, The remaining portion (424) of the purified synthesis gas (420) is brought into contact with water for cooling and washing. method.

6. A plant (1) for converting solid recovered fuel pellets (117) into a hydrogen-containing generated gas stream (601), The system comprises a semi-carbonization gas treatment device (400) and a semi-carbonization device (200) that is fluidly connected to it. The aforementioned semi-carbonized gas treatment device (400) is for processing the semi-carbonized gas (202) that can be generated by the semi-carbonization device (200). The aforementioned semi-carbonized gas treatment device (400) has a combustion chamber (402), The combustion chamber (402) is A first inlet (436) for introducing an oxygen-rich gas flow (404), A second inlet (437) for introducing fuel gas (403), A third inlet (438) for introducing the aforementioned semi-carbonized gas (202) and It has, The combustion chamber (402) is suitable for and intended to generate synthesis gas (407, 401) by quasi-stoichiometrically oxidizing the fuel gas (403) and the semi-carbonized gas (202). The solid recovered fuel pellets (117) are produced from municipal waste in a pelletizing facility (100). The combustion chamber (402) is fluidly connected to the mixing chamber (408) via the combustion chamber outlet (405). The mixing chamber (408) has a rapid cooling zone (439), The rapid cooling zone (439) has an inlet (440) for supplying recycled synthesis gas (406) to rapidly cool the synthesis gas (407), The semi-carbonized gas treatment apparatus (400) is used in the method of claim 1. plant.

7. The plant according to claim 6, The semi-carbonized gas treatment apparatus (400) is used in any of the methods of claims 1 to 5. plant.

8. The plant (1) according to claim 6, The mixing chamber (408) is fluidly connected to the heat recovery system (410), and the following heat exchangers a) A first heat exchanger (441) for the rapidly cooled synthesis gas (409) and the heat transfer medium (411) to exchange heat, b) A second heat exchanger (442) for heat exchange between the rapidly cooled synthesis gas (409) and boiler feedwater (412), c) A superheater (443) for superheating low-pressure steam (415) with the rapidly cooled synthesis gas (409), including at least one of the plant.

9. The plant (1) according to claim 8, The heat recovery system (410) is fluidly connected to a wet cleaning system (417) for purifying the synthesis gas (409) discharged from the heat recovery system (410). plant.

10. The plant (1) according to claim 9, A water-washing cooling tower (422) for cooling and washing the purified synthesis gas (420) is further provided downstream of the wet washing system (417), The water-washing cooling tower (422) is fluidly connected to the wet washing system (417). plant.

11. The plant (1) according to claim 10, The water collection port (419) of the water-washing cooling tower (422) is fluidly connected to the heat pump (427). plant.

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