Gas purification device
A gas purification device removes a part of ammonia contained in a first gas; recovers a first off-gas containing the removed ammonia, removes hydrogen sulfide and ammonia from a second gas produced by removing the part of ammonia, recovers a second off-gas containing the removed hydrogen sulfide and ammonia, and combusts the first off-gas and the second off-gas. The gas purification device includes: a first combustion chamber in which combustion is performed in a reducing atmosphere; a second combustion chamber in which combustion is performed in a reducing atmosphere downstream of the first combustion chamber; and a third combustion chamber in which combustion is performed in an oxidizing atmosphere downstream of the second combustion chamber. The first off-gas flows into the first combustion chamber and the second off-gas flows into the third combustion chamber.
1. A gas purification device for purifying a first gas containing ammonia and hydrogen sulfide, comprising:
an ammonia removal part configured to remove a part of ammonia contained in the first gas from the first gas;
a first off-gas recovery part configured to recover a first off-gas containing ammonia removed by the ammonia removal part;
a hydrogen sulfide/ammonia removal part configured to remove hydrogen sulfide and ammonia from a second gas produced by removing the part of ammonia by the ammonia removal part;
a second off-gas recovery part configured to recover a second off-gas containing hydrogen sulfide and ammonia removed by the hydrogen sulfide/ammonia removal part; and
a combustion part configured to combust the first off-gas and the second off-gas,
wherein the combustion part includes:
a first combustion chamber in which combustion is performed in a reducing atmosphere;
a second combustion chamber in which combustion is performed in a reducing atmosphere downstream of the first combustion chamber; and
a third combustion chamber in which combustion is performed in an oxidizing atmosphere downstream of the second combustion chamber, and
wherein the gas purification is configured such that the first off-gas flows into the first combustion chamber, and the second off-gas flows into the third combustion chamber.
2. The gas purification device according to claim 1 ,
wherein the second gas contains 2 ppm or more of ammonia.
3. The gas purification device according to claim 1 ,
wherein a removal rate of removing ammonia from the first gas is 98% or less.
4. The gas purification device according to claim 1 ,
wherein a part of the second off-gas flows into the second combustion chamber.
5. The gas purification device according to claim 1 , further comprising a denitration part configured to denitrate a flue gas flowing out of the third combustion chamber.
6. The gas purification device according to claim 1 , further comprising a converter configured to hydrolyze hydrogen cyanide and carbonyl sulfide contained in a syngas obtained by gasification of coal to produce the first gas.