The invention discloses a low-consumption and low-emission
nitric acid production method and production equipment thereof. The method and the equipment adopts the same low-
pressure level for oxidation and absorption, the double-pressurization high-
pressure level is omitted, a
molecular sieve absorption device is adopted for
tail gas treatment of a
nitric acid absorption
tower, in addition, secondary air is used for taking reaction with
nitric oxide absorbed in the
molecular sieve absorption device to form regenerated gas, the regenerated gas is sent into the
nitric acid absorption
tower to be recovered and reutilized, the
nitrogen oxide content in the
tail gas is lower than 100mg / Nm<3>, in addition, the yield of the nitric acid can also be improved through the
recovery and the utilization of regeneration gas, a layer of silk screen is arranged on a
sieve plate
tower disc of an oxidation section of the nitric acid absorption tower, the oxidation speed at
high pressure and low pressure can be effectively accelerated, and an N20
decomposition catalyst layer is also additionally arranged in an oxidation reaction vessel, so the N20 content in the
nitric oxide gas in the oxidation reaction vessel can be reduced to about 100PPM. The nitric
acid production method does not need to adopt two pressure levels, no
nitric oxide compressor is adopted, no
tail gas ammonification re-treatment device is adopted, the investment is greatly saved, and the consumption is reduced.