Method for recycling ammonia gas in exhaust gas

Abstract

The invention discloses an ammonia recovery device in waste gas, which comprises an ammonia washing tower, the bottom of the ammonia washing tower is a base, a manhole is arranged on the base, a storage area is arranged above the base, an absorption area is arranged above the storage area, and an absorption area is arranged above the storage area. A spraying device is provided above the spraying device, and the first flue gas outlet is provided on the wall of the ammonia washing tower above the spraying device, and a chimney is provided on the top of the ammonia washing tower. Packing support plates are provided, and each packing support plate is provided with a plurality of holes, the bottom of the absorption area is provided with a flue gas inlet, and a liquid level gauge is provided on the wall of the ammonia washing tower outside the absorption area. An ammonia water outlet is provided at the bottom of the area, and the ammonia water outlet is connected to the soft water source, the ammonia water storage device and the spray device of the ammonia washing tower, and a pump is arranged between the ammonia water outlet and the spray device. The invention has reasonable design, the ammonia-containing waste gas passes through the ammonia washing tower to recycle the ammonia gas, can improve the ammonia recovery rate, and has the advantages of no pollution and zero discharge to the waste gas.

Description

technical field [0001] The invention relates to the technical field of synthetic ammonia waste gas treatment, in particular to an ammonia recovery device in waste gas. Background technique [0002] In the process of ammonia synthesis, exhaust gas containing hydrogen, inert gas and ammonia will be produced, and ammonia will be oxidized in the atmosphere to form NOx, forming acid rain, and then oxidized to nitrate, which enters the water circulation system and pollutes groundwater. The development of agriculture and chemical industry has increased the demand for ammonia, urea, ammonium phosphate, ammonium nitrate, etc., which has promoted the rapid development of my country's synthetic ammonia industry. The annual production volume has continued to rise, and the emission of ammonia-containing gases has further increased. In addition, ammonia can cause harm to human health, and severe cases can cause lung infection and respiratory failure leading to death. Therefore, it is nec...

AI Technical Summary

Problems solved by technology

[0003] The ammonia in it is recovered by using brine washing and absorption process. Due to the limitations of this technology, the ammonia recovery rate has been very low. Nearly half of the ammonia in the ammonia-containing gas is burned in the scrubbing tail gas, wasting a lot of resources, and the ammonia water produced at the same time is due to The concentration is too thin to be treated, and it directly causes serious problems of excessive ammonia nitrogen in the discharged sewage and environmental pollution.

Many companies have tried to distill ammonia from dilute ammonia water for recovery, but this method consumes a lot of energy and costs a lot

Images