201009064 六、發明說明： 【發明所屬之技術領域】 本發明大體上係關於一種用於製造粉煤之方法，尤其 用於冶金工業之用途。 【先前技術】 在冶金工業中，粉煤通常作為可燃物连入敢風壚中。 為確保鼓風爐良好地發揮功能，粉煤具有優良品質（亦即 粉煤具有適當稠度、尺寸及濕度水準）係似要。通常在 研磨及乾燥設備中製造粉煤，其中在粉碎機中研磨原煤， 且乾燥至適當濕度水準，隨後將所得粉煤饋入料斗中以作 儲存或直接用於鼓風遽中。已知可使新鮮研磨之煤經受熱 氣流以使粉煤乾^粉煤可（例如）自熱氣自粉碎機夹帶 至過遽n，隨後在該過，慮器中粉煤肖氣趙分離且饋入料 斗。將-部分氣艘再循環且加熱，隨後將其再引入粉碎機 中0 為使研磨及乾燥設備恰當地發揮功能，監測乾燥氣體 中之氧氣含量係很重要，通常監測過瀘器下游t :量變得過高’則乾燥氣體與粉煤之組合可能成潛 在性危險結果之爆炸性混合物。―般而言，在再循環德 中（亦即在使乾燥氣體返回粉碎機之f線中），自 線 中提取廢氣且注入新鮮空氣。 氣趙 在已知研磨及乾燥設備中，監測乾燥氣體 痛 若發現所量測之氧氣含量過高，則減少弓丨 乾燥氣體中之新鮮空氣的量。此舉可降低乾燥氣 201009064 體中之氧氣含量。 然而，在—些情況下，例如若原煤極其乾燥及/或設備 在減少之負載下運作’則減少引人乾燥氣體中之新鮮空氣 之量可能不^以充分降低氧氣含量。確實，將引人乾燥氣 體中之新鮮空氣之量減少至纟（亦即不再引入新鮮空氣） 之後，在該等情況下氧氣含量可能仍過高。為避免對設備 之任何損害’隨後可能需要關閉研磨及乾燥設備。該關閉 不僅導致產量損失’而且產生與更換乾燥氣體或調節乾燥 氣體相關之額外費用。 發明目的 、本發明之目的在於提供一種用於製造粉煤之改良方 法’該方法不呈現先前技術方法之缺陷。λ目的由如申請 專利It圍第1項所請之方法達成。 【發明内容】201009064 VI. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention generally relates to a method for producing pulverized coal, particularly for use in the metallurgical industry. [Prior Art] In the metallurgical industry, pulverized coal is often used as a combustible substance in the daring. In order to ensure that the blast furnace works well, the quality of the pulverized coal (that is, the pulverized coal has the proper consistency, size and humidity level) is desirable. The pulverized coal is usually produced in a grinding and drying apparatus in which the raw coal is ground in a pulverizer and dried to a suitable humidity level, and the resulting pulverized coal is then fed into a hopper for storage or directly used in a blast furnace. It is known that freshly ground coal can be subjected to a hot gas stream such that the pulverized coal can be entrained, for example, from the pulverizer to the enthalpy n, and then the pulverized coal is separated in the pulverizer. Feed into the hopper. Recirculating and heating some of the gas vessels and then reintroducing them into the pulverizer. 0 In order for the grinding and drying equipment to function properly, it is important to monitor the oxygen content in the drying gas, usually monitoring the downstream of the enthalpy. Too high 'the combination of dry gas and pulverized coal may be an explosive mixture of potentially dangerous results. In general, in the recycling (i.e., in the f line where the drying gas is returned to the pulverizer), the exhaust gas is extracted from the line and fresh air is injected. In the known grinding and drying equipment, the monitoring of dry gas pain, if the measured oxygen content is too high, reduces the amount of fresh air in the drying gas of the bow. This will reduce the oxygen content of the drying gas 201009064. However, in some cases, such as if the raw coal is extremely dry and/or the equipment is operated under reduced load, reducing the amount of fresh air introduced into the drying gas may not sufficiently reduce the oxygen content. Indeed, after reducing the amount of fresh air introduced into the dry gas to enthalpy (i.e., no fresh air is introduced), the oxygen content may still be too high in such cases. To avoid any damage to the equipment, it may be necessary to turn off the grinding and drying equipment. This shutdown not only results in a loss of production' but also creates additional costs associated with replacing dry gas or regulating dry gas. OBJECT OF THE INVENTION It is an object of the present invention to provide an improved method for the manufacture of pulverized coal. This method does not present the drawbacks of prior art methods. The purpose of λ is achieved by the method requested in the first paragraph of the patent application. [Summary of the Invention]
、達成此目的，本發明提出一種用於製造粉煤之方 法，該方法包含以下步驟： 、在熱氣產生器中將乾燥氣體，較佳惰性氣體加熱至預 將經加熱之乾燥氣體饋入粉碎機中； 將原煤引人該料機中，粉碎機將該原煤研磨成粉 _收集來自該粉碎機 該混合物饋入過濾器中， 氣體分離； 之乾燥氣體與粉煤之混合物，且將 該過濾器使經乾燥之粉煤與乾燥 5 201009064 -收集該經乾燥之粉煤以供谁一半姑m 供進步使用，且將來自過濾 器之乾燥氣體饋入再循環管線中传 τ M使至少一部分該乾燥氣 體返回該熱氣產生器； _測定（較佳在該再循㈣線）㈣氣體中之氧氣含 量’且將所測定之氧氣含量與預定氧氣含量臨限值比較。 根據本發明之較佳具難實例，若所測定之氧氣含量高 於預定氧氣臨限值’則在將經加熱之乾燥氣體饋人粉碎機 中之前將水注人其中，所注人水之體積經計算以使氧氣含 量降低至低於預定氧氣含量臨限值。將水注人乾燥氣體中 使得乾燥氣體之總體積增加，從而減少相對氧氣體積。因 此，注水可將氧氣含量降低至可接受含量，且從而避免對 設備之任何損害或避免關閉研磨及乾燥設備之需要。 根據較佳具體實例’該方法進一步包含在再循環管線 中將新鮮空氣注入乾燥氣體中，纟中若所測定之氧氣含量 高於預定氧氣含量臨限值’則減少注人乾燥氣體中之新鮮 空氣之體積。 有利地，該方法包含首先減少注入乾燥氣體中之新鮮 空氣之體積，且隨後，若所注入之新鮮空氣之體積達到零 且氧氣含量仍高於預定氧氣臨限值，則在將經加熱之乾燥 氣體饋入粉碎機之前將水注入其中，所注入水之體積經計 算以使氧氣含量降低至低於預定氧氣含量臨限值。 較佳地，預定氧氣臨限值選擇在〇與14體積％之間， 較佳在5與12體積％之間。 根據本發明之進一步態樣，該方法包含以下其他步 201009064 .π定離開粉碎機之乾燥氣體與粉煤之混合物的出口溫 又及在將經加熱之乾燥氣體饋入粉碎機中之前，藉由控 制'主入經加熱之乾燥氣體之水之體積來控制出σ溫度。藉 由控制注入粉辟捣μ、说 冰 機上游之乾燥氣體中之水之量，可快速調 卽進入粉碎機之乾燥f艘 ^ 展氣體之^度以考慮由於引入粉碎 之具有不同濕度水準之及媒而左/ 千又原煤而存在之溫差。從而可保 開粉碎機之乾燥氣體夕、、田、 氧體之,皿度（下文稱為出口溫度） 恆定。 月6 本態樣在設備啟動階段期間尤其有利，其中該方 含啟動循環，纟中將經加熱之乾燥氣體饋經粉碎機而不引 入原煤，_保持出口溫度低於第—溫度臨限值；及研磨循環， 其中將經加熱之乾燥氣體饋經粉碎機且㈣煤引人粉碎機 中’保持出口溫度處於較佳工作溫度。根據本發明 態樣’該方法包含： _在啟動循環_，將該乾燥氣體加熱至高於第一溫度 粵臨限值之溫度’且將一體積之水注入經加熱之乾燥氣體 中，水之體積經計算以降低經加熱之乾燥氣體之溫度從而 獲得低於該第一溫度臨限值之出口溫度；及 -在研磨循環開始時，減少注入經加熱之乾燥氣體中之 水之體積以補償出口溫度之降低。 在設備啟動階段期間，通常在將原煤引入粉碎機中之 前將乾燥氣體饋經設備。此舉可使個別組份加熱至所需工 作溫度。藉由控制在此啟動階段期間注入粉碎機上游之乾 燥氣體中之水的量，可使可能加熱至高於最大容許出口溫。 7 201009064 度之溫度的乾燥氣體再次冷卻以使粉碎機下游之溫度不超 過第一溫度臨限值。 當隨後開始引入原煤時，由於添加冷且濕之物質而發 生出口溫度之急劇下降。藉由在熱氣產生器中將乾燥氣體 過度加熱且隨後經由注水使其冷卻，可快速調整進入粉碎 機之乾燥氣鍾之溫度以適應新操作條件。減少所注入水之 量可使進入粉碎機之乾燥氣體之溫度快速升高以補償引入 原煤所致之溫度降低。因此，顯著減少或甚至避免在較低 溫度下製造粉煤之過渡時間。亦顯著減少不可用煤裝之 量，從而提高設備之效率。 可基於出口皿度確定注入經加熱之乾燥氣體中之水之 體積。或者’可基於所量測之粉碎機上之壓降確定注入經 加熱之乾燥氣體中之水之體積。並不排除單獨或組合使用 其他量度來確定注入經加熱之乾燥氣體中之水之體積。 ，較佳地，在研磨循環期間及在補償出口溫度降低之 後’該方法包含以下 …、 左乂下其他步驟：減少對乾燥氣體之加熱； :/ ;主入絰加熱之乾燥氣體中之水之體積以保持所需出 ’皿度&舉可降低設備運作後之能量消耗。確實，過度 番及隨後冷卻乾燥氣體之重要性在設備啟動階段期間尤 、要#中此舉可提供緩衝以補償開始引入原煤時所發 生之溫度降低。設^ 備運作之後，可能僅發生較小之溫度降 低且可減少緩衝。κ 灰太 因此，在研磨及乾燥設備正常操作期間， 無需在熱氣產生器中技 至工作溫度。 乾燥乳體過度加熱且隨後將其冷卻 201009064 在再循環管線中，一部分妒 * 乾燥氣體可作為廢氣蒋 除新鮮空氣之外，亦可將熱氣、矛、。 體中。 i入再循環管線中之乾燥氣 該方法亦可包含連續監測出口溫度及將所量測之出口 溫度與最高溫度比較，丨中若所量測之出口溫 溫度，則增加注入經加熱之乾燥氣體中之水之體積過= 卻。 之左水構件亦可用於緊急冷 【實施方式】 圖1展示用於使用本發明 燥設備。 以方法製造粉煤之研磨及乾 該研磨及乾燥設備10包含 粉碎機20’原煤經由輪送應 22饋入該粉碎機2〇中。在 坩衔达機 在粕碎機20中，將原煤在 動件（圖中未示）或任何其 / 队^± 』兵他％知研磨構件之間壓碎成細 粉。同時，將熱乾燥氣體饋經粉 砰或細 ❹ 燥氣體經由氣體入口 24谁 m 乾 4進入粉碎機20。在粉碎機20之卜 游，研磨及乾燥設備1〇包含埶 之上 匕3熟氣產生器％，在該熱 器26中可將乾燥氣體加埶 ,„ 97 , ^ …、主預疋溫度。該熱氣產生器26 由燃燒器27 (諸如例如多 .. 式燃燒器（multiple lance birnier))供能。經加埶 9〇 ^ …乾燥乳體自熱氣產生器26經由管 道28運載至粉碎機2〇。在姆 24 20 , 在、加熱之乾燥氣體自氣體入口 24穿過粕碎機20至出口 3 ^ . ^ . v 砰夾帶粉煤。粉煤與乾燥氣 體之此〇物自粉碎機2〇經由瞢曾 ^ „ .., '由管道32運載至過濾器34，在 該過慮器34中再次自乾、燥 、氣體中移出粉煤且饋入粉煤收集 9 201009064 器36中，以備進—步使用。將離開過濾器34之乾燥氣體 饋入再循環管線38以將其饋回熱氣產生器26。再循環管線 列包含風扇構件4〇以使乾燥氣體穿過該設備循環。風扇構 件40可位於用於自再循環管線38提取一部分乾燥氣體之 管線42 (例如通風管）之上游或下游。 扣'環管線3 8進—步包含氣體注人構件44以將新鮮 空氣及/或熱m再循環管線38巾。將载人之新鮮空氣 或…氣與再循環之乾燥氣體混合。所注入之新鮮空氣可 降低乾燥氣體之露點，λ + β ^# 難’且所m氣詩q研磨及乾 燥迴路之熱平衡。 明之重要態樣，設備10包含配 器26下収粉碎機2() ^熱乳產及 之重要性^ 之庄水構件46。該注水構件Φ 重要將在以下描述中變得顯而易見。 ，注水構件46有助於藉由調節乾燥氣體中之氧氣含量來 調即：燥氣體之露點。在再循環管線38巾，經由管線4. 提取-部分乾燥氣體，且可經由氣體 入2 空氣。在習知母供士 , 傅旰料庄入新鮮 監測氧氣人詈° ，於安全原因藉助於氧氣感應器45 茛邓氧氣含量，且若發現氧 構件44減少引入乾焊/過^則指示氣體注入 八乾燥虱體中之新 體注入構件44達到其*畔二虱之罝。然而，當氣 Τ ”運到其關閉點時，木女 完全關閉且無新鮮空氣注 备軋體注入構件44 “路祖@ 燥氧體中時出現間題。若觭 後仍發現氧氣含量過高，料％Π題右隨 t之新鮮空氣步減少注入乾燥氣體 鞔之體積，而必需闕閉設備。 根據本發明，乾燥氣體 孔3量可藉由藉助於注 201009064 46备將水/主入乾燥氣體申而降低。當由氧氣感應器45 所量測之氧氣含量過高時，可指核水構件46增加注入乾 燥氣體中之水之體積，從而降低m 34下游之氧氣含量。 較佳地’首先藉由減少由氣體注入構件44注入乾燥氣 體中之新鮮空氣之體積的習知方法來降低氧氣含量，且若 此降低不賴，則進-步藉由增加由注水構件⑹主入乾燥 氣體中之水之體積來降低氧氣含量。 夂構件46之$ ϊ力忐可為輔助調節粉碎機2〇出口 處乾燥氣體之溫度在操作中，在熱氣產生器Μ中將乾燥 氣體加熱至狀溫度，且饋經粉碎機2G。當使用來自乾燥 氣體之熱來乾燥粉煤時，在粉碎機2G中乾燥氣體之溫度被 降低。原煤之濕度水準決定乾燥氣體之溫度損失。為防止 損害過濾器34，（例如）藉助於溫度感應器48監測離開粉 碎機20之粉煤與乾燥氣體之混合物之溫度（下文稱為出口 溫度）。 ‘ 瘳 為保持恰當出口溫度，需要控制進入粉碎機之乾燥氣 體之溫度，此通常藉由控制熱氣產生器26之燃燒器27之 輸出功率來達成。令人遺憾地，此方法具有相對緩慢之反 應時間，其意謂在設備確定出口溫度過高或過低且使燃燒 器27因此作出反應之後，經過一段時間之後出口溫度才會 再次達到恰當出口溫度。 在設備啟動階段期間，反應時間尤其重要。確實，最 初，將經加熱之乾燥氣體饋經設備，隨後引入原煤。此舉 可使設備變熱且達到理想工作條件。當隨後在特定時間之 11 201009064 後將原煤引入粉搞 、 碎機20中時，出口溫度急劇降至大大低於 牛 ’皿度。通常’燃燒器27隨後作出反應，藉由進一 赫熱乾燥氣體以達到所需出口溫度。然而，隨後在延遲 性β 2間之後才獲得所需出°溫度，且同時獲得之任何粉 、两0月b由於尚未充分乾燥而必須棄去。瑞實，在出口溫度 β氏之過渡時期内’通常獲得不可用之煤製而非經乾燥之 粉煤。 〃 © β艮據本發明’在啟動階段期間，燃燒H 27經設定以將 乾燥氣體加熱至大大高於所需出口溫度。隨後藉由經由注 水構件46將水注人經加熱之乾燥氣體中來對經加 氣體進行控制冷卻，由此冷卻乾燥氣雜從而可達成所= 溫度在研磨及乾燥設備之特定變熱時間之後，者 煤引入粉碎機20中時，出口溫度急劇降至大大低於所需出 口溫度。替代藉由調適燃燒器27之加熱溫度 下降’減少由注水構件46注人乾燥氣體中之水之量。由^ ❹ ”乾燥氣體較少程度地冷卻，而可保持所需出口 溫度穩定。&程序之反應時間顯著短於習知程序之反應時 間’從而顯著減少或免去出口溫度過低且製造不可 之過渡時期。 爆聚 應注意，此方法在啟動階段期間，亦即在最勒將原煤 引入粉碎機t之後不久之過渡時期内展示其最㈣n 然而，本發明之方法在設備正常操作期間亦有利。當發生 原煤濕度減小時，可使出口溫度快速 所需出口溫 度’假使發生溫度急劇下降。 12 201009064 為了最佳化能量消耗’出口溫度穩定 '^该·逐；^，述，/、丧』 乾燥氣體之加熱以及隨後之冷卻為有利的 奸 ^ y m 後之冷卻，則可關閉注水系統。 右不需要該隨 有利地，注水構件46亦用於緊急冷卻。該方 連續監測出口溫度及將所量測之 可已3 ® 溫度與最高汊好a 較。當所量測之出口溫度超過最高溫度時 皿又比 46增加注入經加熱之乾燥氣體曰不，水構件 入粉碎機2〇之乾燥氣體之溫度且因此亦^積’從而降低進 之乾燥氣體之溫度。 '、降低離開粉碎機20 【圖式簡單說明】 本發明將自以上對一非限 隨w+菌斗、I * 王具體實例之描述且表去 隨附圖式而更顯而易見，其 <且參考 方法的研磨及乾燥設備之示意圖。 本發明之 【主要元件符號說明】 (無） m 13To achieve this object, the present invention provides a method for producing pulverized coal, the method comprising the steps of: heating a drying gas, preferably an inert gas, in a hot gas generator to feed the heated dry gas to the pulverizer Introducing raw coal into the material, the pulverizer grinds the raw coal into powder _ collecting the mixture from the pulverizer, feeding the mixture into the filter, separating the gas; mixing the dry gas with the pulverized coal, and filtering the filter Drying the pulverized coal with drying 5 201009064 - collecting the dried pulverized coal for use by a half, and feeding the dry gas from the filter into the recirculation line to pass at least a portion of the drying The gas is returned to the hot gas generator; _ is determined (preferably in the recirculating (four) line) (iv) the oxygen content in the gas 'and the measured oxygen content is compared to a predetermined oxygen content threshold. According to a preferred embodiment of the present invention, if the measured oxygen content is higher than the predetermined oxygen threshold, the water is injected into the pulverizer before the heated dry gas is fed into the pulverizer. It is calculated to reduce the oxygen content below a predetermined oxygen content threshold. Injecting water into the drying gas increases the total volume of the drying gas, thereby reducing the relative oxygen volume. Thus, water flooding reduces the oxygen content to an acceptable level and thereby avoids any damage to the equipment or the need to shut down the grinding and drying equipment. According to a preferred embodiment, the method further comprises injecting fresh air into the drying gas in the recirculation line, wherein if the measured oxygen content is higher than the predetermined oxygen content threshold, the fresh air in the dry gas is reduced. The volume. Advantageously, the method comprises first reducing the volume of fresh air injected into the drying gas, and then, if the volume of fresh air injected reaches zero and the oxygen content is still above a predetermined oxygen threshold, then the heated drying is performed. Water is injected into the gas before it is fed into the pulverizer, and the volume of the injected water is calculated to reduce the oxygen content below a predetermined oxygen content threshold. Preferably, the predetermined oxygen threshold is selected between 〇 and 14% by volume, preferably between 5 and 12% by volume. According to a further aspect of the invention, the method comprises the following additional steps 201009064. The exit temperature of the mixture of dry gas and pulverized coal leaving the pulverizer is further and before the heated dry gas is fed into the pulverizer, Controlling the volume of water that is directed into the heated drying gas controls the σ temperature. By controlling the amount of water in the dry gas that is injected into the powder and upstream of the ice machine, the degree of drying of the gas entering the pulverizer can be quickly adjusted to take into account the different humidity levels due to the introduction of pulverization. And the media and the left / thousand and the original coal and the temperature difference. Thereby, the dry gas of the pulverizer can be maintained, the field, the oxygen body, and the dish (hereinafter referred to as the outlet temperature) is constant. This aspect is particularly advantageous during the start-up phase of the equipment, wherein the party contains a start-up cycle in which the heated dry gas is fed through the pulverizer without introducing raw coal, _ maintaining the outlet temperature below the first temperature threshold; A grinding cycle in which the heated drying gas is fed through the pulverizer and (4) the coal is introduced into the pulverizer to keep the outlet temperature at a preferred operating temperature. According to the aspect of the invention, the method comprises: _ in the start-up cycle _, heating the dry gas to a temperature higher than the first temperature, and injecting a volume of water into the heated dry gas, the volume of water Calculated to reduce the temperature of the heated drying gas to obtain an outlet temperature below the first temperature threshold; and - at the beginning of the grinding cycle, reduce the volume of water injected into the heated drying gas to compensate for the outlet temperature Reduced. During the start-up phase of the plant, the dry gas is typically fed through the equipment prior to introduction of the raw coal into the pulverizer. This allows individual components to be heated to the desired working temperature. By controlling the amount of water injected into the dry gas upstream of the pulverizer during this startup phase, it is possible to heat up above the maximum allowable outlet temperature. 7 The dry gas at a temperature of 201009064 is again cooled so that the temperature downstream of the pulverizer does not exceed the first temperature threshold. When the introduction of raw coal is subsequently started, a sharp drop in the outlet temperature occurs due to the addition of cold and wet matter. By overheating the drying gas in the hot gas generator and then cooling it by water injection, the temperature of the drying gas clock entering the pulverizer can be quickly adjusted to accommodate the new operating conditions. Reducing the amount of water injected allows the temperature of the drying gas entering the pulverizer to rise rapidly to compensate for the temperature drop caused by the introduction of the raw coal. Therefore, the transition time for manufacturing pulverized coal at a lower temperature is significantly reduced or even avoided. It also significantly reduces the amount of coal that is not available, thereby increasing the efficiency of the equipment. The volume of water injected into the heated drying gas can be determined based on the outlet degree. Alternatively, the volume of water injected into the heated drying gas can be determined based on the measured pressure drop across the pulverizer. It is not excluded to use other measures, alone or in combination, to determine the volume of water injected into the heated drying gas. Preferably, during the grinding cycle and after the compensation outlet temperature is lowered, the method comprises the following:, the other step of the left underarm: reducing the heating of the drying gas; : /; the water in the drying gas heated by the main inlet The volume to maintain the desired 'degree of dish> can reduce the energy consumption of the device after operation. Indeed, the importance of over- and subsequent cooling of the drying gas during the start-up phase of the equipment provides a buffer to compensate for the temperature drop that occurs when the raw coal is initially introduced. After the device is in operation, only a small temperature drop may occur and buffering may be reduced. κ 灰 too Therefore, it is not necessary to work in the hot gas generator to the operating temperature during normal operation of the grinding and drying equipment. The dried milk is overheated and then cooled. 201009064 In the recirculation line, a part of the 妒* dry gas can be used as a waste gas to remove fresh air, as well as hot gas, spears. In the body. i. The dry gas in the recirculation line may also include continuously monitoring the outlet temperature and comparing the measured outlet temperature to the highest temperature, and increasing the injected dry gas if the outlet temperature is measured in the crucible The volume of water in the middle = but. The left water member can also be used for emergency cooling. [Embodiment] Fig. 1 shows a drying apparatus for use in the present invention. Grinding and Drying of Pulverized Coal by Method The grinding and drying apparatus 10 comprises a pulverizer 20' raw coal fed into the pulverizer 2 via a transfer. In the masher 20, the raw coal is crushed into fine powder between moving parts (not shown) or any of its components. At the same time, the hot dry gas is fed through the gas or the fine gas into the pulverizer 20 via the gas inlet. In the pulverizer 20, the grinding and drying apparatus 1 comprises a 熟3 cooked gas generator % on the crucible, in which the drying gas can be twisted, „97, ^ ..., the main preheating temperature. The hot gas generator 26 is energized by a burner 27 such as, for example, a multiple lance birnier. The dried milk is fed from the hot gas generator 26 via line 28 to the pulverizer 2姆 At 24 24 20 , the heated drying gas passes from the gas inlet 24 through the masher 20 to the outlet 3 ^ . ^ . v 砰 entrains the pulverized coal. The pulverized coal and the dry gas are from the pulverizer 2〇 It is carried by the pipe 32.., 'from the pipe 32 to the filter 34, in which the pulverized coal is again removed from the dry, dry, gas and fed into the pulverized coal collection 9 201009064 36 for preparation - Step by step. The dry gas leaving the filter 34 is fed to a recirculation line 38 for feeding it back to the hot gas generator 26. The recirculation line column contains fan members 4〇 to circulate dry gas through the apparatus. The fan member 40 can be located upstream or downstream of a line 42 (e.g., a vent tube) for extracting a portion of the dry gas from the recirculation line 38. The buckle 'ring line 38' includes a gas injection member 44 to recirculate the fresh air and/or heat m to the line 38. Mix human fresh air or gas with recycled dry gas. The fresh air injected can reduce the dew point of the dry gas, λ + β ^ # difficult and the heat balance of the grinding and drying circuits. In an important aspect of the invention, the apparatus 10 includes a water-splitting member 46 for the importance of the pulverizer 2 (), the heat production, and the importance of the adapter 26. The water injection member Φ will become apparent in the following description. The water injection member 46 helps to adjust the dew point of the dry gas by adjusting the oxygen content in the drying gas. In the recirculation line 38, a portion of the dry gas is extracted via line 4. and 2 air can be introduced via the gas. In the case of the known mother, the 旰 旰 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入 入The new body injecting member 44 in the eight dry carcass reaches its edge. However, when the gas ” is transported to its closing point, the wood female is completely closed and there is no fresh air to be injected into the rolling body injection member 44. If the oxygen content is still too high after 觭, the fresh air step right after t is reduced to the volume of the dry gas, and the equipment must be shut down. According to the present invention, the amount of dry gas pores 3 can be lowered by means of the preparation of the water/main dry gas by means of the injection 201009064. When the oxygen content measured by the oxygen sensor 45 is too high, it may be said that the nuclear water member 46 increases the volume of water injected into the dry gas, thereby reducing the oxygen content downstream of the m 34 . Preferably, the oxygen content is first reduced by a conventional method of reducing the volume of fresh air injected into the dry gas by the gas injection member 44, and if the reduction is not good, the step is further advanced by the water injection member (6). The volume of water in the drying gas reduces the oxygen content. The 夂 member 46 46 can assist in adjusting the temperature of the drying gas at the exit of the pulverizer 2 在. In operation, the drying gas is heated to a temperature in the hot gas generator , and fed to the pulverizer 2G. When the pulverized coal is dried using heat from a dry gas, the temperature of the drying gas in the pulverizer 2G is lowered. The humidity level of the raw coal determines the temperature loss of the dry gas. To prevent damage to the filter 34, the temperature of the mixture of pulverized coal and dry gas leaving the pulverizer 20 (hereinafter referred to as the outlet temperature) is monitored, for example, by means of a temperature sensor 48. ‘ 瘳 In order to maintain proper outlet temperature, it is necessary to control the temperature of the dry gas entering the pulverizer, which is usually achieved by controlling the output power of the burner 27 of the hot gas generator 26. Unfortunately, this method has a relatively slow reaction time, which means that after the device determines that the outlet temperature is too high or too low and the burner 27 reacts accordingly, the outlet temperature will again reach the proper outlet temperature after a period of time. . Reaction time is especially important during the start-up phase of the equipment. Indeed, initially, the heated drying gas is fed through the equipment and subsequently introduced into the raw coal. This will heat the unit and achieve the desired working conditions. When the raw coal is subsequently introduced into the powder and crusher 20 after a specific time of 11 201009064, the outlet temperature drops sharply below the cattle's degree. Typically, the burner 27 then reacts by heating the gas to a desired exit temperature. However, the desired temperature was subsequently obtained after the delay of β 2 , and any powder obtained at the same time, two months b must be discarded because it was not sufficiently dried. Rui Shi, in the transition period of the export temperature of β, usually obtains coal that is not available, rather than dried pulverized coal. 〃 © β 艮 According to the invention, during the start-up phase, combustion H 27 is set to heat the drying gas to a temperature substantially higher than the desired outlet temperature. The controlled gas is then cooled by injecting the water into the heated drying gas via the water injection member 46, thereby cooling the dry gas to achieve the temperature after the specific heating time of the grinding and drying apparatus. When the coal is introduced into the pulverizer 20, the outlet temperature drops sharply below the desired outlet temperature. Instead of reducing the heating temperature of the burner 27, the amount of water in the drying gas injected into the water injection member 46 is reduced. The drying gas is cooled to a lesser extent by ^ ❹ ", while maintaining the desired outlet temperature stable. The reaction time of the program is significantly shorter than the reaction time of the conventional program', thereby significantly reducing or eliminating the outlet temperature is too low and manufacturing is not possible During the transition period, it should be noted that this method exhibits the most (four) n during the start-up phase, that is, during the transition period shortly after the introduction of the raw coal into the pulverizer t. However, the method of the present invention is also advantageous during normal operation of the apparatus. When the humidity of the raw coal is reduced, the outlet temperature can be quickly set to the required outlet temperature. If the temperature drops sharply. 12 201009064 In order to optimize the energy consumption, the outlet temperature is stable. ^^··············· The heating of the drying gas and subsequent cooling is followed by a cooling of the favorable sm. The water injection system can be closed. The water-injecting member 46 is also desirably used for emergency cooling. The party continuously monitors the outlet temperature and will The measured 3 ® temperature is compared with the highest a a. When the measured outlet temperature exceeds the maximum temperature, the dish is increased by 46 and injected. The hot drying gas is not, the temperature of the water component into the drying gas of the pulverizer 2 and thus also 'reducing' the temperature of the drying gas. ', lowering away from the pulverizer 20 [Simplified description of the drawing] The present invention will From the above description of a non-limiting w+ hopper, I* Wang specific examples and the accompanying drawings are more obvious, and the schematic diagram of the grinding and drying apparatus of the reference method. Description] (none) m 13