有機(jī)污染物對石灰石-石膏法脫硫塔漿液起泡影響研究
發(fā)布時間：2019-02-13 00:16
【摘要】：石灰石-石膏濕法煙氣脫硫運(yùn)行中,常會出現(xiàn)吸收塔漿液起泡溢流現(xiàn)象,吸收塔內(nèi)循環(huán)漿液起泡后,液位計顯示液位遠(yuǎn)遠(yuǎn)超過真實液位,再加上其他因素影響,塔內(nèi)循環(huán)漿液液位波動明顯變大,從而導(dǎo)致吸收塔間歇性溢流。隨著起泡現(xiàn)象的加重,吸收塔循環(huán)漿液溢流量過大,漿液不能通過溢流管及時排出,泡沫就會涌進(jìn)原煙氣煙道、增壓風(fēng)機(jī),將帶來脫硫效率降低、石膏品質(zhì)下降、增壓風(fēng)機(jī)的運(yùn)行安全受到威脅等問題,影響了脫硫系統(tǒng)的穩(wěn)定和安全運(yùn)行。吸收塔漿液起泡溢流現(xiàn)象不僅會降低脫硫效率,污染周圍環(huán)境,而且還會造成周圍設(shè)備的腐蝕,嚴(yán)重時整個脫硫系統(tǒng)將停運(yùn)并置換吸收塔內(nèi)的漿液。本文對吸收塔漿液溢流的現(xiàn)象、危害、原因分析等進(jìn)行了分析,主要研究了有機(jī)污染物對漿液起泡的影響,通過漿液中的化學(xué)需氧量(COD)、總有機(jī)碳(TOC)和總碳(TC)來研究漿液起泡的影響,得出以下結(jié)論:1.漿液中的COD含量嚴(yán)重影響漿液的起泡,一般未起泡時的漿液COD低至幾十毫克每升,而起泡后的漿液COD值都處于300-600mg/L;漿液COD不是唯一影響漿液起泡的因素,消泡劑的添加只是在一定程度上降低漿液中的COD值而不是明顯的降低;起泡有一定的時間蓄積性,消泡劑的加入對消泡在一定程度有滯后性。漿液COD中的一部分是由石灰石漿液COD而決定的;脫硫系統(tǒng)一直在不停地運(yùn)轉(zhuǎn),漿液中COD在不停的蓄積。2.吸收塔漿液總體的TOC在80 mg/L～310 mg/L之間,通過分析無法得出漿液TOC的值與漿液起泡的關(guān)系,可能的原因有加入的消泡劑影響了漿液TOC的值。相關(guān)性分析得漿液中的COD與TOC有中等相關(guān)性,漿液消泡劑添加量既漿液的起泡程度的影響因素不止?jié){液中的TOC,也可得消泡劑的添加只是在一定程度上降低漿液中的TOC值。吸收塔漿液TOC主要來源于處理的廢氣中夾帶的未完全燃燒的有機(jī)顆粒。3.吸收塔漿液TC總體在113 mg/L～353.3 mg/L之間,漿液TC與消泡劑的添加量總體趨勢圖呈現(xiàn)一致性。二號吸收塔漿液COD、TOC和TC的值整體比一號吸收塔漿液的COD、TOC和TC值高相同;故可得出漿液中的COD、TOC和TC對漿液起泡是有一定的影響。吸收塔漿液TC大部分來源于煙氣中的未完全燃燒顆粒,少部分來源石灰石漿液。
[Abstract]:In the operation of limestone gypsum wet flue gas desulphurization, the phenomenon of bubbling and overflow of slurry in absorption tower is often observed. After the circulating slurry in absorption tower is bubbled, the liquid level is far higher than the real liquid level, which is influenced by other factors. The liquid level fluctuation of circulating slurry in the tower increases obviously, which leads to the intermittent overflow of the absorption tower. With the aggravation of foaming phenomenon, the overflow amount of circulating slurry in absorption tower is too large, the slurry can not be discharged through the overflow pipe in time, the foam will pour into the original flue gas flue, pressurized fan, will bring about the reduction of desulphurization efficiency and the decline of gypsum quality. The operation safety of turbofan is threatened, which affects the stability and safety of desulfurization system. The phenomenon of bubbling and overflow of slurry in absorber will not only reduce the efficiency of desulfurization and pollute the surrounding environment, but also cause corrosion of the surrounding equipment. In serious cases, the whole desulfurization system will be shut down and the slurry in the absorber will be replaced. In this paper, the phenomenon, harm and cause analysis of slurry overflow in absorber are analyzed. The influence of organic pollutants on the bubbling of slurry is mainly studied. The chemical oxygen demand (COD),) in the slurry is studied by means of chemical oxygen demand (COD),). Total organic carbon (TOC) and total carbon (TC) were used to study the effect of slurry foaming, and the following conclusions were obtained: 1. The COD content in the slurry has a serious effect on the bubbling of the slurry. The COD of the slurry is as low as tens of mg / liter when it is not bubbling, while the COD value of the slurry after bubbling is in the range of 300-600mg / L; The addition of defoamer only reduced the value of COD in the slurry to a certain extent, but not obviously. Foaming has a certain time accumulation, defoamer has a lag in a certain extent. Part of the slurry COD is determined by limestone slurry COD; the desulphurization system has been running continuously, and the COD in the slurry is accumulating continuously. 2. 2. The total TOC of the size of the absorber is between 80 mg/L~310 mg/L. The relationship between the value of TOC and the bubbling of the slurry can not be obtained by analysis. The possible reason is that the addition of defoamer affects the value of the TOC of the slurry. The correlation analysis shows that the COD in the size has a moderate correlation with TOC, and the amount of defoamer not only affects the degree of foaming of the slurry, but also the addition of the defoamer can reduce the value of TOC in the size to a certain extent. The absorption column slurry TOC is mainly derived from incomplete combustion organic particles entrained in the treated waste gas. 3. The total TC of the absorber slurry is between 113 mg/L~353.3 mg/L, and the overall trend chart of the addition of TC and defoamer is consistent. The values of COD,TOC and TC in No. 2 absorber are higher than those of COD,TOC and TC in No. 1 absorber, so it can be concluded that the COD,TOC and TC in the slurry have a certain influence on the bubbling of the slurry. The absorption column slurry TC mostly comes from incomplete combustion particles in flue gas and a few from limestone slurry.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X773
本文編號：2420956
[Abstract]:In the operation of limestone gypsum wet flue gas desulphurization, the phenomenon of bubbling and overflow of slurry in absorption tower is often observed. After the circulating slurry in absorption tower is bubbled, the liquid level is far higher than the real liquid level, which is influenced by other factors. The liquid level fluctuation of circulating slurry in the tower increases obviously, which leads to the intermittent overflow of the absorption tower. With the aggravation of foaming phenomenon, the overflow amount of circulating slurry in absorption tower is too large, the slurry can not be discharged through the overflow pipe in time, the foam will pour into the original flue gas flue, pressurized fan, will bring about the reduction of desulphurization efficiency and the decline of gypsum quality. The operation safety of turbofan is threatened, which affects the stability and safety of desulfurization system. The phenomenon of bubbling and overflow of slurry in absorber will not only reduce the efficiency of desulfurization and pollute the surrounding environment, but also cause corrosion of the surrounding equipment. In serious cases, the whole desulfurization system will be shut down and the slurry in the absorber will be replaced. In this paper, the phenomenon, harm and cause analysis of slurry overflow in absorber are analyzed. The influence of organic pollutants on the bubbling of slurry is mainly studied. The chemical oxygen demand (COD),) in the slurry is studied by means of chemical oxygen demand (COD),). Total organic carbon (TOC) and total carbon (TC) were used to study the effect of slurry foaming, and the following conclusions were obtained: 1. The COD content in the slurry has a serious effect on the bubbling of the slurry. The COD of the slurry is as low as tens of mg / liter when it is not bubbling, while the COD value of the slurry after bubbling is in the range of 300-600mg / L; The addition of defoamer only reduced the value of COD in the slurry to a certain extent, but not obviously. Foaming has a certain time accumulation, defoamer has a lag in a certain extent. Part of the slurry COD is determined by limestone slurry COD; the desulphurization system has been running continuously, and the COD in the slurry is accumulating continuously. 2. 2. The total TOC of the size of the absorber is between 80 mg/L~310 mg/L. The relationship between the value of TOC and the bubbling of the slurry can not be obtained by analysis. The possible reason is that the addition of defoamer affects the value of the TOC of the slurry. The correlation analysis shows that the COD in the size has a moderate correlation with TOC, and the amount of defoamer not only affects the degree of foaming of the slurry, but also the addition of the defoamer can reduce the value of TOC in the size to a certain extent. The absorption column slurry TOC is mainly derived from incomplete combustion organic particles entrained in the treated waste gas. 3. The total TC of the absorber slurry is between 113 mg/L~353.3 mg/L, and the overall trend chart of the addition of TC and defoamer is consistent. The values of COD,TOC and TC in No. 2 absorber are higher than those of COD,TOC and TC in No. 1 absorber, so it can be concluded that the COD,TOC and TC in the slurry have a certain influence on the bubbling of the slurry. The absorption column slurry TC mostly comes from incomplete combustion particles in flue gas and a few from limestone slurry.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X773
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