RTO treatment process for tail gas produced by ammoxidation process

A treatment process and ammonia oxidation technology, applied in the field of environmental engineering, can solve the problems of high cost, unstable operation, low efficiency, etc., and achieve the effects of high thermal energy utilization rate, high operation stability, and high removal efficiency.

Pending Publication Date: 2021-06-04
NJTECH ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the technical problems that need to be solved in the prior art: the current ammonia oxidation process produces tail gas treatment technology with low efficiency, high cost, unstable operation and other problems, and provides a high-efficiency, low-cost and long-term stable operation of ammonia Oxidation process tail gas thermal storage incineration (RTO) treatment process

Method used

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  • RTO treatment process for tail gas produced by ammoxidation process
  • RTO treatment process for tail gas produced by ammoxidation process

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Ammonia oxidation tail gas source strength: ammonia 3800mg / m 3 , Hydrogen cyanide 300mg / m 3 , Nitrile organic substance 320mg / m 3 , Benzene 300mg / m 3 .

[0034]High concentration (organized) exhaust gas and low concentration (no tissue) exhaust gas mixed exhaust gas temperature at 140 ° C, the temperature of the exhaust gas in the exhaust gas heating mix tank is 180 ° C, the RTO combustion chamber temperature is 880 ° C, flue gas mix The exhaust gas temperature after mixing the box is 300 ° C. SCR catalyst specific surface area 900m 2 / m 3 , Urea solution concentration is 5% wt, the spray density of the washing tower is 4m 3 / (m 2 , H), the base concentration of the base is 5% wt.

[0035] Ammonia ≤22mg / m after treatment 3 , Hydrogen cyanide ≤0.02mg / m 3 , Nitrile organic matter ≤ 2mg / m 3 , Benzene ≤ 1mg / m 3 , NOx ≤ 70mg / m 3 , Emissions stably meet the national and local emissions standards and requirements.

Embodiment 2

[0037] Ammonia oxidation exhaust source strength: ammonia 720mg / m 3 , Hydrogen cyanide 1700mg / m 3 , Nitrile organic matter 150mg / m 3 , Benzene 110mg / m 3 .

[0038] High concentration (organized) exhaust gas and low concentration (no tissue) exhaust gas mixed exhaust gas temperature at 160 ° C, the temperature of the exhaust gas in the exhaust gas heating mix tank is 200 ° C, the RTO combustion chamber temperature is 880 ° C, flue gas mix The exhaust gas temperature after the mixture is 320 ° C. SCR catalyst specific surface area 1100m 2 / m 3 , Urea solution concentration is 5% wt, the spray density of the washing tower is 3m 3 / (m 2 , H), the use of the base concentration of 10% wt.

[0039] Ammonia ≤13mg / m after treatment 3 , Hydrogen cyanide ≤0.08mg / m 3 , Nitrile organic matter ≤1.3mg / m 3 , Benzene ≤0.8mg / m 3 NOx ≤ 50mg / m 3 , Emissions stably meet the national and local emissions standards and requirements.

Embodiment 3

[0041] Ammonia oxidation tail gas source strength: ammonia 220mg / m 3 , Hydrogen cyanide 900mg / m 3 , Nitrile organic substances 80mg / m 3 , Benzene material 130mg / m 3 .

[0042] High concentration (organized) exhaust gas and low concentration (no tissue) exhaust gas mixed exhaust gas temperature at 160 ° C, the temperature of the exhaust gas in the exhaust gas heating mix tank is 200 ° C, the RTO combustion chamber temperature is 850 ° C, flue gas mix The exhaust gas temperature after mixing the box is 300 ° C. SCR catalyst specific surface area 1100m 2 / m 3 , The urea solution concentration is 8% wt, the spray density of the washing tower is 3m 3 / (m 2 , H), the use of the base concentration of 10% wt.

[0043] Ammonia ≤12mg / m after treatment 3 , Hydrogen cyanide ≤0.06mg / m 3 , Nitrile organic matter ≤1.9mg / m 3 , Benzene ≤ 2.8mg / m 3 NOx ≤ 40mg / m 3 , Emissions stably meet the national and local emissions standards and requirements.

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Abstract

The invention relates to a regenerative thermal oxidation (RTO) treatment process for tail gas produced by an ammoxidation process. The RTO treatment process comprises a flue gas flow mixer, a waste gas heating and mixing box, a front induced draft fan, a flame arrester, an RTO incinerator, a flue gas mixing box, a static mixer, a selective catalytic reduction denitration (SCR) reactor, a plate heat exchanger, a washing tower, a rear induced draft fan and a chimney. According to the process, ammonia, hydrogen cyanide and nitrile-containing organic matters are synergistically degraded; and meanwhile, generated NOx is efficiently removed, and the treated waste gas stably meets national and local emission standards and requirements. The whole process has the advantages of high removal efficiency, high operation stability, low operation cost and the like; and the purification efficiency can reach 99% or above, the purification efficiency of generated secondary NOx can reach 90% or above, and emission is stable and meets national and local emission standards and requirements.

Description

Technical field [0001] The present invention relates to the field of environmental engineering technology, and more particularly to a aminoxy chemical production of exhaust gas storage thermal incineration RTO treatment processes. Background technique [0002] Ammonia oxidation is an important chemical technology that produces nitrile products. It is characterized in that the ammonia and organic matter are raw materials, which can be produced for the preparation of plastics, synthetic fibers, pesticides (bacterium clear) and epoxy resin curing agents. Intermediate. However, limited by ammonia oxidation catalyst technology, the conversion of the target product is relatively low, "three waste" is large, especially exhaust gas. The exhaust gas produced by the process contains a large amount of ammonia, cyanide, hydrogen-containing organic substance, etc., the difficulty of treatment; the simultaneous safety hazard is high due to the low melting point of nitrile organic matter, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/07F23G5/14F23G5/44F23G5/46
CPCF23G5/14F23G5/44F23G5/46F23G7/07
Inventor 徐炎华于鹏吴玉明沈德第
Owner NJTECH ENVIRONMENT TECH CO LTD
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