(1.中南大學(xué) 能源動(dòng)力學(xué)院，長(zhǎng)沙 410083；
2.韶關(guān)冶煉廠， 韶關(guān) 512024)
摘 要: 為了研究韶關(guān)冶煉廠鉛塔燃燒室抽氣熱電偶中輸入單位階躍煙氣溫度信號(hào)后的輸出信號(hào)情況，對(duì)熱電偶測(cè)頭以及熱電偶隔熱罩在靜態(tài)下的輻射熱損失以及動(dòng)態(tài)響應(yīng)過(guò)程進(jìn)行了分析。結(jié)果顯示：在動(dòng)態(tài)響應(yīng)過(guò)程中熱電偶讀數(shù)誤差主要決定于熱電偶測(cè)頭以及熱電偶隔熱罩的輻射熱損失，并且它的輻射熱損失又受熱電偶測(cè)頭的滯后時(shí)間常數(shù)τ0的 限制；隨著動(dòng)態(tài)響應(yīng)過(guò)程的進(jìn)行，熱電偶讀數(shù)的誤差急劇變化；當(dāng)τ=τ0時(shí)，基本上可以認(rèn)為動(dòng)態(tài)響應(yīng)過(guò)程結(jié)束，但升溫變化時(shí)誤差更大。此研究結(jié)果將十分有益于韶關(guān)冶煉廠鉛塔燃燒室溫度在線檢測(cè)。
關(guān)鍵字: 鋅精餾；燃燒室；誤差；溫度測(cè)量；動(dòng)態(tài)響應(yīng)
in combustion chamber of lead column
in zinc refining
MEI Chi1，CAI Jun-lin2
（1.College of Energy and Power, Central South University,
Changsha 410083, China；
2. Shaoguan Smelter，Shaoguan 512024, China）
Abstract:In order to study the case of signal exported by the thermocouple wit h air pump after the signal as unit pulse imported by smoke temperature due to variational temperature in combustion chamber of lead column in Shaoguan Smelter, the loss of radiant heat in static state and the course of dynamic response about the measure head of thermocouple and the cover of thermocouple were deduced and analyzed. The results are revealed that reading error of the thermocouple in the course of dynamic response is mainly caused by the loss of radiant heat of the measure top of thermocouple and the cover of thermocouple, and their loss of radiant heat is restricted by their lagging time constant τ0; along with the process of dynamic response, reading error of the thermocouple is changed; when τ=3τ0, the process of dynamic response basically finishes, but the change due to ascending temperature will cause bigger reading error of t he thermocouple. The result of study will be more beneficial to on-line control of temperature in combustion chamber of lead column in Shaoguan Smelter.
Key words: zinc refining; combustion chamber; error; temperature measurement; dynamic response
