本文關(guān)鍵詞：小型熱電廠實(shí)現(xiàn)超低排放改造技術(shù)路線應(yīng)用與研究　出處：《青島理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 小型熱電廠 氮氧化物 煙塵 二氧化硫 超低排放

【摘要】：在國家大氣污染物排放標(biāo)準(zhǔn)逐年嚴(yán)格的情況下,大氣污染物實(shí)現(xiàn)超低排放是燃煤熱電企業(yè)當(dāng)前普遍面臨的新挑戰(zhàn)。本文針對(duì)青島熱電股份公司4臺(tái)75t/h煤粉鍋爐現(xiàn)有設(shè)備及特點(diǎn),進(jìn)行脫硝、除塵及脫硫工藝的技術(shù)路線研究,確定最佳改造方案,實(shí)現(xiàn)超低排放目標(biāo),對(duì)小型熱電企業(yè)環(huán)保改造具有重要指導(dǎo)意義。通過研究得到以下結(jié)論:(1)針對(duì)燃用貧煤,熱風(fēng)送粉小型煤粉鍋爐,充分分析了煤種變化,制粉系統(tǒng)啟停及燃燒器對(duì)氮氧化物生成濃度的影響。根據(jù)分析結(jié)果確定了貧煤改燒煙煤,熱風(fēng)送粉改為乏氣送粉的技術(shù)改造路線,NOx生成濃度由550mg/Nm3降至350mg/Nm3。通過改造不僅能從源頭減少NOx生成,并且有利于減少后續(xù)煙氣中NOx污染物治理成本及難度。(2)煙氣中NOx治理最優(yōu)選擇方案為SCR技術(shù),脫硝效率達(dá)到85%以上,達(dá)到NOx濃度小于50 mg/Nm3的超低排放標(biāo)準(zhǔn)。(3)對(duì)于此熱電廠高濃度煙塵及老舊電除塵器實(shí)現(xiàn)超低排放目標(biāo),改為電袋復(fù)合除塵器是最佳手段,可使除塵器出口濃度達(dá)到20mg/Nm3以下,配合濕式電除塵器實(shí)現(xiàn)煙塵排放小于10mg/Nm3。(4)針對(duì)原雙堿法脫硫系統(tǒng),在保留雙堿法優(yōu)點(diǎn)及節(jié)省投入資金的情況下,進(jìn)行系統(tǒng)優(yōu)化改造,實(shí)現(xiàn)SO2排放濃度小于35mg/Nm3。先進(jìn)有效的設(shè)備系統(tǒng)是實(shí)現(xiàn)超低排放的重要前提,科學(xué)細(xì)致的運(yùn)行調(diào)整是實(shí)現(xiàn)超低排放的重要保證,對(duì)于爐內(nèi)低氮燃燒,SCR脫硝系統(tǒng),雙堿法脫硫氧化再生及塔內(nèi)噴淋等方面精細(xì)、嚴(yán)謹(jǐn)?shù)倪\(yùn)行調(diào)整至關(guān)重要。在這些方面仍需通過運(yùn)行實(shí)踐總結(jié)規(guī)律,研究如何利用自動(dòng)調(diào)節(jié)、智能控制實(shí)現(xiàn)超低排放的目標(biāo)。
[Abstract]:Under the circumstance that the national air pollutant discharge standard is strict year by year. The realization of ultra-low emission of atmospheric pollutants is a new challenge to coal-fired thermal power enterprises. This paper aims at the existing equipment and characteristics of four 75 t / h pulverized coal boilers in Qingdao Thermal Power Co., Ltd. The technical route of dust removal and desulphurization process is studied to determine the best retrofit scheme and to realize the ultra-low emission target. It is of great guiding significance to the environmental protection reform of small thermal power enterprises. The following conclusions are obtained: (1) aiming at the small pulverized coal boilers burning lean coal and hot air pulverized coal, the change of coal types is fully analyzed. Starting and stopping of pulverizing system and influence of burners on the concentration of nitrogen oxides. According to the analysis results, the technical transformation route of lean coal to bituminous coal and hot air powder to spent gas powder was determined. The concentration of NOx is reduced from 550 mg / Nm3 to 350 mg / Nm3. Not only can the NOx generation be reduced from the source. And it is helpful to reduce the cost and difficulty of NOx pollution treatment in the follow-up flue gas.) the best solution for NOx treatment in flue gas is SCR technology, and the denitrification efficiency is more than 85%. To achieve the ultra-low emission standard of NOx concentration less than 50 mg/Nm3.) to achieve the ultra-low emission target for high concentration soot dust and old electrostatic precipitator in this thermal power plant. It is the best method to change to the electric bag composite dust collector, which can make the outlet concentration of the dust collector under 20mg / Nm3. Combined with wet electrostatic precipitator to realize smoke emission less than 10 mg / Nm 3. 4) aiming at the original double alkali desulphurization system, the system was optimized under the condition of keeping the advantages of double alkali process and saving investment. The realization of SO2 emission concentration less than 35mg / Nm3.Advanced and effective equipment system is an important prerequisite to achieve ultra-low emissions, scientific and meticulous operation adjustment is an important guarantee to achieve ultra-low emissions. For the SCR denitrification system of low nitrogen combustion in the furnace, the regeneration of double alkali desulfurization and oxidation and the spray in the tower are very fine, and the strict operation adjustment is very important. In these aspects, we still need to sum up the rules through the operation practice. This paper studies how to use automatic regulation and intelligent control to achieve the goal of ultra-low emission.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X773;TM621

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本文編號(hào)：1410865