Knockout, compressor and indirect heating equipment

The utility model provides a knockout, compressor and indirect heating equipment. The knockout includes: casing, casing have casing entry and casing export, blast pipe, the first end of blast pipe pass in the casing export stretches into the cavity of casing, and the part that lies in the casing of blast pipe has and is used for falling at least one of making an uproar and expands pipeline section. The first end of blast pipe passes the casing export of casing and stretches into in the cavity of casing to the part that lies in the casing that makes the blast pipe has and is used for falling at least one expansion pipeline section of making an uproar, forms cancel each other out of reflection so that get into sound wave in the blast pipe in the expansion pipeline section, so as to effectively reduce the blast pipe air current pulsation noise, lengthened the life of blast pipe, and then improved knockout, compressor and heat transfer system's operational reliability.