DUAN Ni-na,TAN Xue-jun,ZHANG Chen.Analysis of Sewage Sludge Mono-incineration Thermodynamic Calculation Method in a Sewage Treatment Plant[J].China Water & Wastewater,2021,37(16):83-88.
污水處理廠(chǎng)污泥獨(dú)立焚燒的熱力計(jì)算方法解析
- Title:
- Analysis of Sewage Sludge Mono-incineration Thermodynamic Calculation Method in a Sewage Treatment Plant
- 摘要:
- 污泥焚燒作為城鎮(zhèn)污水廠(chǎng)污泥處理的主流技術(shù)之一，在我國(guó)得到越來(lái)越多的工程化應(yīng)用，現(xiàn)階段我國(guó)污泥焚燒在進(jìn)行工藝設(shè)計(jì)和運(yùn)行情況模擬時(shí)，計(jì)算污泥（燃料）發(fā)熱量、煙氣組成和焓值等關(guān)鍵環(huán)節(jié)，多借鑒燃煤鍋爐的熱力計(jì)算方法。熱力計(jì)算是工藝設(shè)計(jì)和工藝運(yùn)行時(shí)模擬預(yù)測(cè)的基本依據(jù)，作為工藝設(shè)計(jì)過(guò)程的重要內(nèi)容，其方法的修正和完善有利于提升工藝設(shè)計(jì)和運(yùn)行調(diào)控的準(zhǔn)確性和合理性。污泥焚燒與燃煤鍋爐燃燒過(guò)程和控制要點(diǎn)均有差異，燃煤鍋爐計(jì)算方法忽略了煙氣中水蒸氣的潛熱，故采用燃煤鍋爐熱力計(jì)算方法的準(zhǔn)確度有待驗(yàn)證。分別采用傳統(tǒng)燃煤鍋爐的熱力計(jì)算方法和優(yōu)化后的方法進(jìn)行了計(jì)算示例比較，當(dāng)采用燃煤鍋爐的熱力計(jì)算方法進(jìn)行污泥焚燒的工藝計(jì)算時(shí)，由于未考慮煙氣中水蒸氣的實(shí)際狀態(tài)和潛熱，影響焚燒爐燃燒溫度、煙氣余熱利用和煙氣凈化各環(huán)節(jié)的溫度預(yù)測(cè)的精確度。我國(guó)污泥焚燒入爐含水率的常見(jiàn)區(qū)間為50%~60%，采用傳統(tǒng)方法計(jì)算時(shí)，從燃燒溫度到后續(xù)煙氣設(shè)施對(duì)應(yīng)的入口和出口溫度均偏高40~50 ℃。當(dāng)采用傳統(tǒng)方法進(jìn)行設(shè)計(jì)和運(yùn)行時(shí)，應(yīng)結(jié)合入爐含水率的選擇，充分考慮到由此引起的偏差。
- Abstract:
- Sludge incineration, as one of the main sludge treatment technologies in urban sewage treatment plants, has been widely applied in engineering in China. At present, coal-fired boiler thermodynamic calculation method is often referred to calculate the key parameters (such as calorific value of sludge or fuel, composition of flue gas and enthalpy value) in the process of design and simulation. Thermal calculation is the basis of process design and simulation. As an important part of process design, modification and improvement of the method is beneficial to improve the accuracy and rationality of process design and management. There are differences in the incineration process and management between sewage sludge and coal incineration in coal-fired boilers. The calculation method of coal-fired boilers ignores the latent heat of water vapor in flue gas, so the accuracy of coal-fired boiler thermal calculation method needs to be verified. A comparison between the traditional thermal calculation method and the optimized thermal calculation method was exemplified. The actual state and latent heat of water vapor in flue gas were not considered when the coal-fired boiler thermal calculation method was used for sludge incineration process calculation, which affected the temperature prediction accuracy of incinerator combustion, flue gas waste heat utilization and flue gas purification. Common range of sludge water content to be combusted in the furnace in China is 50%-60%. The combustion temperature and the corresponding inlet and outlet temperature of flue gas facilities were 40-50 ℃ higher when the traditional method was employed. When the traditional method is used for design and operation, the deviation caused by calculation should be fully considered in combination with the selection of sludge water content to be combusted in the furnace.
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