全面腐蚀控制
全麵腐蝕控製
전면부식공제
TOTAL CORROSION CONTROL
2015年
4期
14-19
,共6页
燃煤机组%锅炉烟气%脱硝%灰中氨%测定
燃煤機組%鍋爐煙氣%脫硝%灰中氨%測定
연매궤조%과로연기%탈초%회중안%측정
coal fired units%boiler flue gas%denitrification%ash ammonia%determination
NOx是大气环境的主要污染物之一，其主要来源为火力发电机组。依靠低氮燃烧技术，远达不到排放要求。选择性催化还原脱硝(简称SCR)技术是目前效率最高、最成熟、应用最广泛的电厂烟气脱硝技术。目前，在线氨逃逸监测技术存在诸多问题，影响了氨逃逸监测数据的准确度和稳定性。在燃料种类、炉膛结构、受热面布置、过量空气量、炉膛气流分布以及脱硝催化剂类型等条件确定的情况下，控制好氨加入量及其逃逸量是保证NOx脱除率的关键所在。燃煤锅炉除尘飞灰氨含量可侧面反映脱硝氨逃逸率的状况。根据国外的文献报道，正常情况下，电除尘灰中氨含量一般在50mg/kg-100mg/kg范围内。由于国内尚无灰中氨含量的测定方法，亦无脱硝运行对飞灰含氨量影响的数据积累。本文通过大量试验，确定了灰中氨溶解条件(如溶解时间、搅拌状态、灰水比、灰样量及其稳定性等)，制定了灰中氨含量测定方法。
NOx是大氣環境的主要汙染物之一，其主要來源為火力髮電機組。依靠低氮燃燒技術，遠達不到排放要求。選擇性催化還原脫硝(簡稱SCR)技術是目前效率最高、最成熟、應用最廣汎的電廠煙氣脫硝技術。目前，在線氨逃逸鑑測技術存在諸多問題，影響瞭氨逃逸鑑測數據的準確度和穩定性。在燃料種類、爐膛結構、受熱麵佈置、過量空氣量、爐膛氣流分佈以及脫硝催化劑類型等條件確定的情況下，控製好氨加入量及其逃逸量是保證NOx脫除率的關鍵所在。燃煤鍋爐除塵飛灰氨含量可側麵反映脫硝氨逃逸率的狀況。根據國外的文獻報道，正常情況下，電除塵灰中氨含量一般在50mg/kg-100mg/kg範圍內。由于國內尚無灰中氨含量的測定方法，亦無脫硝運行對飛灰含氨量影響的數據積纍。本文通過大量試驗，確定瞭灰中氨溶解條件(如溶解時間、攪拌狀態、灰水比、灰樣量及其穩定性等)，製定瞭灰中氨含量測定方法。
NOx시대기배경적주요오염물지일，기주요래원위화력발전궤조。의고저담연소기술，원체불도배방요구。선택성최화환원탈초(간칭SCR)기술시목전효솔최고、최성숙、응용최엄범적전엄연기탈초기술。목전，재선안도일감측기술존재제다문제，영향료안도일감측수거적준학도화은정성。재연료충류、로당결구、수열면포치、과량공기량、로당기류분포이급탈초최화제류형등조건학정적정황하，공제호안가입량급기도일량시보증NOx탈제솔적관건소재。연매과로제진비회안함량가측면반영탈초안도일솔적상황。근거국외적문헌보도，정상정황하，전제진회중안함량일반재50mg/kg-100mg/kg범위내。유우국내상무회중안함량적측정방법，역무탈초운행대비회함안량영향적수거적루。본문통과대량시험，학정료회중안용해조건(여용해시간、교반상태、회수비、회양량급기은정성등)，제정료회중안함량측정방법。
NOx is one of the main pollutants in the atmospheric environment, which is mainly from the thermal power generating units. Rely on low nitrogen combustion technology, far less than the emission requirements. Selective catalytic reduction (SCR) technology is the power plant flue gas DeNOx Technology is currently the most widely the highest efficiency and most mature, application. At present, online ammonia escape monitoring technology has many problems, affecting the ammonia escape the accuracy and stability of the monitoring data. In determining the type of fuel, furnace structure, the arrangement of heating surface, excess air, furnace air distribution and denitration catalyst type and other conditions, good control of ammonia addition amount and escape volume is the key to guarantee the NOx removal rate. Coal-fired boiler dust fly ash ammonia content can reflect the denitration ammonia escape rate conditions. According to foreign reports, under normal circumstances, the ammonia content in flue dust electricity is generally in the range of 50mg/kg-100mg/kg. The determination method of ammonia is no ash in domestic, no denitrification operation of fly ash containing ammonia affects the amount of accumulated data. In this paper, through a lot of experiments, the conditions of ammonia dissolved in ash determined (such as dissolution time, mixing state, cement water ratio, ash sample quantity and stability), developed methods for determination of ammonia in ash.
