在化工领域中，相信很多人都听过双碱法脱硫，的是听过的人不一定清楚双碱法脱硫到底好不好，甚至有的人可能连双碱法是什么都不知道，简单的说，双碱法是一种我国主要的烟气脱硫技术。不了解双碱法脱硫工艺的人有福了，今天小编给大家说说双碱法脱硫工艺的弊端（双碱法脱硫工艺流程图）。

　　In the field of chemical engineering, I believe many people have heard of the dual alkali desulfurization method. However, those who have heard of it may not be clear whether the dual alkali desulfurization method is good or not. Some people may even not know what the dual alkali desulfurization method is. Simply put, the dual alkali desulfurization method is a major flue gas desulfurization technology in China. Those who are not familiar with the dual alkali desulfurization process are fortunate. Today, the editor will talk about the drawbacks of the dual alkali desulfurization process (dual alkali desulfurization process flowchart).

　　1.双碱法脱硫工艺的弊端

　　1. Disadvantages of dual alkali desulfurization process

　　经多年使用，双碱法脱硫工艺的弊端逐步暴露出来，主要体现在以下几个方面：

　　After years of use, the drawbacks of the dual alkali desulfurization process have gradually been exposed, mainly reflected in the following aspects:

　　1）氢氧化钠或碳酸钠与二氧化硫反应同时也会与二氧化碳反应，烟气中二氧化碳含量远远高于二氧化硫含量，二氧化碳与氢氧化钠反应后生成碳酸钠，，二氧化硫与氢氧化钠反应生成硫酸钠和亚硫酸钠，这2个反应是同时进行的，因二氧化碳含量大很多，故碳酸钠产生量相当大，碳酸钠部分与溶于水的二氧化硫再次反应，的二氧化硫在第一次喷淋洗涤后含量很少(部分与氢氧化钠反应生成硫酸钠和亚硫酸钠)，二次反应后还会出现大量的碳酸钠排入置换系统，故二氧化碳消耗的氢氧化钙(置换后实际消耗为氢氧化钙)量很高(受脱硫效率、洗涤效率、停留时间影响)。

　　1) Sodium hydroxide or sodium carbonate reacts with sulfur dioxide and also reacts with carbon dioxide. The carbon dioxide content in the flue gas is much higher than that of sulfur dioxide. After the reaction between carbon dioxide and sodium hydroxide, sodium carbonate is produced, while sulfur dioxide reacts with sodium hydroxide to produce sodium sulfate and sodium sulfite. These two reactions occur simultaneously. Due to the much higher carbon dioxide content, the amount of sodium carbonate produced is quite large. Some of the sodium carbonate reacts with sulfur dioxide dissolved in water again, and the sulfur dioxide content is very low after the first spray washing (some reacts with sodium hydroxide to produce sodium sulfate and sodium sulfite). After the second reaction, a large amount of sodium carbonate is discharged into the displacement system, so the amount of calcium hydroxide consumed by carbon dioxide (which is actually consumed as calcium hydroxide after displacement) is very high (affected by desulfurization efficiency, washing efficiency, and residence time). The sentence is:.

　　2）亚硫酸钠与石灰(氢氧化钙)反应较快(置换系统内反应)，的硫酸钠与氢氧化钙很难反应，脱硫循环水中硫酸钠含量不断增加，脱硫效率不断下降，导致烟气排放超标，也导致烧碱消耗量大大增加。

　　2) Sodium sulfite reacts quickly with lime (calcium hydroxide) in the displacement system, while sodium sulfate and calcium hydroxide are difficult to react. The sodium sulfate content in the desulfurization circulating water continues to increase, resulting in a continuous decrease in desulfurization efficiency, leading to excessive flue gas emissions and a significant increase in caustic soda consumption.

　　3）亚硫酸钠与石灰(氢氧化钙)反应段无有效手段控制反应效率，即无法控制置换效率，导致未经置换的亚硫酸钠氧化为硫酸钠，因硫酸钠很难与氢氧化钙反应，导致浪费和影响脱硫效率。

　　3) There is no effective means to control the reaction efficiency between sodium sulfite and lime (calcium hydroxide) in the reaction section, that is, the displacement efficiency cannot be controlled, resulting in the oxidation of non displaced sodium sulfite to sodium sulfate. Sodium sulfate is difficult to react with calcium hydroxide, leading to waste and affecting desulfurization efficiency.

　　4）因为置换系统无法分辨氢氧化钠和氢氧化钙，故氢氧化钙在喷淋水中的含量会很高，导致结垢。

　　4) Because the displacement system cannot distinguish between sodium hydroxide and calcium hydroxide, the content of calcium hydroxide in the spray water will be high, leading to scaling.

　　2.双碱法脱硫工艺流程图

　　2. Double alkali desulfurization process flow chart

　　以上就是小编对“双碱法脱硫工艺的弊端（双碱法脱硫工艺流程图）”的解答，双碱法脱硫不止一种方法，最常用的是钠钙双碱法脱硫，它采用钠碱吸收SO2,吸收液再用石灰进行再生，生成亚硫酸钙和硫酸钙等沉淀物，再生后的溶液返回吸收器循环使用。

　　The above is the editor's answer to the "disadvantages of the dual alkali desulfurization process (dual alkali desulfurization process flowchart)". There are more than one method of dual alkali desulfurization, and the most commonly used is the sodium calcium dual alkali desulfurization method. It uses sodium alkali to absorb SO2, and the absorption liquid is regenerated with lime to generate precipitates such as calcium sulfite and calcium sulfate. The regenerated solution is returned to the absorber for recycling.

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