在化工領域中，相信很多人都聽過雙堿法脫硫，的是聽過的人不一定清楚雙堿法脫硫到底好不好，甚至有的人可能連雙堿法是什么都不知道，簡單的說，雙堿法是一種我國主要的煙氣脫硫技術。不了解雙堿法脫硫工藝的人有福了，今天小編給大家說說雙堿法脫硫工藝的弊端（雙堿法脫硫工藝流程圖）。

　　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.雙堿法脫硫工藝的弊端

　　1. Disadvantages of dual alkali desulfurization process

　　經(jīng)多年使用，雙堿法脫硫工藝的弊端逐步暴露出來，主要體現(xiàn)在以下幾個方面：

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

　　1）氫氧化鈉或碳酸鈉與二氧化硫反應同時也會與二氧化碳反應，煙氣中二氧化碳含量遠遠高于二氧化硫含量，二氧化碳與氫氧化鈉反應后生成碳酸鈉，，二氧化硫與氫氧化鈉反應生成硫酸鈉和亞硫酸鈉，這2個反應是同時進行的，因二氧化碳含量大很多，故碳酸鈉產(chǎn)生量相當大，碳酸鈉部分與溶于水的二氧化硫再次反應，的二氧化硫在第一次噴淋洗滌后含量很少(部分與氫氧化鈉反應生成硫酸鈉和亞硫酸鈉)，二次反應后還會出現(xiàn)大量的碳酸鈉排入置換系統(tǒng)，故二氧化碳消耗的氫氧化鈣(置換后實際消耗為氫氧化鈣)量很高(受脫硫效率、洗滌效率、停留時間影響)。

　　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）亞硫酸鈉與石灰(氫氧化鈣)反應較快(置換系統(tǒng)內(nèi)反應)，的硫酸鈉與氫氧化鈣很難反應，脫硫循環(huán)水中硫酸鈉含量不斷增加，脫硫效率不斷下降，導致煙氣排放超標，也導致燒堿消耗量大大增加。

　　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）亞硫酸鈉與石灰(氫氧化鈣)反應段無有效手段控制反應效率，即無法控制置換效率，導致未經(jīng)置換的亞硫酸鈉氧化為硫酸鈉，因硫酸鈉很難與氫氧化鈣反應，導致浪費和影響脫硫效率。

　　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）因為置換系統(tǒng)無法分辨氫氧化鈉和氫氧化鈣，故氫氧化鈣在噴淋水中的含量會很高，導致結(jié)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.雙堿法脫硫工藝流程圖

　　2. Double alkali desulfurization process flow chart

　　以上就是小編對“雙堿法脫硫工藝的弊端（雙堿法脫硫工藝流程圖）”的解答，雙堿法脫硫不止一種方法，最常用的是鈉鈣雙堿法脫硫，它采用鈉堿吸收SO2,吸收液再用石灰進行再生，生成亞硫酸鈣和硫酸鈣等沉淀物，再生后的溶液返回吸收器循環(huán)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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