Treatment system for recovering chemical plant waste gas containing ammonia into liquid ammonia and treatment method thereof

Abstract

The invention discloses a treatment system for recovering chemical plant waste gas containing ammonia into liquid ammonia and a treatment method thereof. The treatment method comprises the steps of primary surface cold treatment, frequency conversion pressure stabilizing treatment, primary condensing treatment, secondary condensing treatment, drying filtration treatment, cooling liquidation treatment, gas-liquid separation treatment and the like. The treatment system comprises a primary surface air cooler, a frequency conversion Roots blower, a primary condenser, a secondary condenser, a primary drying filter, a secondary drying filter, a liquid ammonia plate heat exchanger and a gas-liquid separator which are communicated through a pipeline, and finally a high-purity liquid ammonia product is obtained. Meanwhile, the treatment method further comprises the step of tail gas treatment. The treatment system further comprises a tail gas treatment unit, and high-concentration liquid ammonia is prepared and obtained. The treatment method has the advantages that the treatment effect is good, the purity of side products is high, the market value of the side products is high, and the side products are environmentally friendly. The treatment system has the advantages of being convenient to operate, low in energy consumption cost, high in intelligence degree, good in safety, high in stability and small in space size.

Description

technical field [0001] The invention relates to the technical field of waste gas recovery and treatment, in particular to a treatment system and a treatment method for recycling ammonia-containing waste gas into liquid ammonia in a chemical plant. Background technique [0002] The chemical industry occupies an important position in the national economy of various countries, and is the basic industry and pillar industry of many countries. The development speed and scale of the chemical industry have a direct impact on all sectors of the social economy, and the world's annual output value of chemical products has exceeded 1.5 trillion US dollars. The chemical industry is a major polluter due to its wide variety, complex processes, and diverse products. At the same time, chemical products may produce a large amount of toxic substances in various links such as processing, storage, use and waste disposal, which will affect the ecological environment and endanger human health. T...

AI Technical Summary

Problems solved by technology

Traditional treatment technologies include 1. Use sulfuric acid to absorb ammonia in the exhaust gas to form ammonium sulfate, but ammonium sulfate needs to be treated again, and the treatment cost is very high

2. The method of washing with water absorbs the ammonia in the tail gas, and then neutralizes it with NAOH to achieve the purpose of ammonia nitrogen discharge, but the treatment effect is unstable

The previous technology not only has poor processing effect but also has no reuse value

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