乐动体育下载水平控製可以改善紙漿和紙張加工效率
動態紙漿和造紙工業正在經曆迅速和重大變化。在紙漿和造紙加工中產生增長的許多趨勢是亞洲紙質產品需求的穩步上升，以及升級或更換具有更有效和可持續的設施的舊磨機。在許多情況下，紙漿和紙張加工業務采用了侵略性的保護和碳緩解舉措，以支持可持續性作為核心業務原則。
Level measurement plays a critical role in improving efficiency throughout the pulp and paper manufacturing process. In this short series of blog articles from Magnetrol®, we will look at a variety of applications where level control instrumentation can benefit facility-wide efficiency and sustainability. In this post, we will explore level measurement applications in chipping, pulping, washing, bleaching, stock prep, blending and papermaking processes. Please follow our blog over the following two weeks, as well, when we review the benefits of level control in turpentine and liquor recovery, as well as the application of level instrumentation in plant-wide operations including MC pump standpipes, water storage, chemicals and additives, and lubrication and hydraulic oils.
源水和酒吧屏幕
應用：作為工藝水的最大工業用戶，紙漿和造紙廠通常位於天然水源旁邊。欄杆放置在進氣通道或濕孔中，以清除可能損壞磨機設備的碎屑。當碎屑已經累積時，通過通常由安裝在上遊通道中的電平控製致動的自動耙耙來完成屏幕清潔。乐动体育下载
挑戰：進氣通道和植物井的水位需要監測。雖然通常是常規應用，但冰凍的天氣可能導致水平控製的並發症，尤其是那些致力於屏幕清潔的並發症。乐动体育下载盡管乐动体育下载結冰的條件，但在寒冷中操作的水平控製，室外條件必須準確可靠。
水平技術：
- Echotel®超聲波液位開關，用於點電平
- 旋轉電機超聲波發射器，Eclipse®導向波雷達變送器或Pulsar®通風雷達變送器，用於連續水平
PULP CHIP BINS & SILOS
應用：The majority of mills make pulp stock from wood chips. Mill chippers produce uniformly sized wood pieces that pass through vibrating screens to further sort for size consistency. Chips are stored in large silos and conveyed to the chip bin where they are pre-steamed prior to entering the pulp digester.
挑戰：Level switches monitoring chip levels are designed exclusively for bulk solids. Switches monitor high and low levels, actuate filling operations, and trigger alarms in the event of plugged flow or overflow conditions. Level controls must contend with dusty atmospheres, steam, vapors, and the chips’ changing angle of repose. Stable chip bin level facilitates proper pre-steaming of chips.
水平技術：
– ECLIPSE Guided Wave Radar Transmitter with bulk solids probe for continuous level
紙漿蒸煮器
應用：牛皮紙過程是最普遍的製漿方法。這裏，熱和化學品（氫氧化鈉和硫化鈉或白液）在大型加壓爐籽或消化器中結合，通過溶解木材的木質素粘合劑將木屑轉化為紙漿。廢木質素和花費化學品或黑液，被布線到回收鍋爐。
挑戰：Digester level monitoring maintains operational stability, increases throughput and reduces kappa variation (the measure of lignin remaining in the pulp). Process conditions of up to +355° F (+180° C), steam, high pressure, and harsh chemicals may challenge many level sensors. Continuous level monitoring and point monitoring for overflow is a common scheme for digesters.
水平技術
- Thermatel®熱分散開關，用於點電平
– ECLIPSE Guided Wave Radar Transmitter or PULSAR Through-Air Radar Transmitter for continuous level
DIGESTER BLOW TANK
應用：在批量消化中，在完成烹飪循環後，將紙漿和黑色液體機械地傳送或“吹入”到大氣吹氣箱中。罐是一個大的圓柱形容器，其用作烹飪紙漿的中間儲存，並且紙漿（現在被稱為“由於其顏色）的棕色股票”從此發電，以偶數流到洗滌過程。
挑戰：Level control of the blow tank helps to maintain balance between the digestion and washing processes. Level controls facilitate ontime blow spacing in the digester while promoting improved product quality by maintaining consistent washer production and efficiency. The presence of a tank agitator will affect level control selection, which is typically a high level switch.
水平技術：
- 旋轉電池超聲波開關或熱分散開關，用於點電平
– ECLIPSE Guided Wave Radar Transmitter or PULSAR Through-Air Radar Transmitter for continuous level
紙漿洗滌係統
應用：在化學製漿過程中的兩個任張中洗滌紙漿。刮水後，棕色股票（帶殘留木質素的紙漿）在消化器後洗淨;並在多級漂白單元中洗滌漂白的原料。在每種情況下，紙漿通過一係列墊圈和屏幕移動以除去殘留的化學物質和芯片。乐动体育下载水平控製通常監測洗滌裝置中的質量箱和濾液罐。
挑戰：Precise level control of the two pulp washing lines ensures a consistent supply of wash water; maintains level stability; ensures correct dilution levels for the wash line; keeps filtrate flows in balance; and will lessen the chemical load and possible problems in downstream processing units caused by unwashed pulp.
水平技術
Thermatel熱分散開關用於點電平
ECLIPSE Guided Wave Radar Transmitter or PULSAR Through-Air Radar Transmitter for continuous level
CHLORINE DIOXIDE (CLO2） 發電機
應用：由於對二惡英和呋喃的健康，安全和環境擔憂，曾經普遍使用元素氯作為紙漿漂白劑，使得替代技術。如今，元素氯（ECF）技術用於約95％的漂白紙漿生產。發電機產生克洛2與水混合漂白。
挑戰：將氣態二氧化氯輸送到吸收塔，其中溶解在冷卻水中以產生二氧化含氯漂白溶液。在發電機中保持連續水平至關重要，因為發電機中的化學材料平衡是必不可少的。故障控製可以創建一個“白色外”，其中漂白生產停止和關閉。
水平技術：
- 75係列密封外部籠式開關，Tuffy®II浮動驅動開關或旋轉型超聲波開關，用於點電平
– ECLIPSE Guided Wave Radar Transmitter or E3 Modulevel® Displacer Transmitter for continuous level
– Atlas® Magnetic Level Indicator for visual indication
PULP BLEACHING TOWERS
應用：由於必須經常被漂白，因此紙漿離開蒸煮器洗滌單元由於殘留的木質素含量而保持著深棕色。漂白植物美白紙漿通過三到五個階段的漂白和水洗。通常，兩對二氧化氯和腐蝕塔之後呈紙漿洗滌階。
挑戰：Bleaching operations require level controls to maintain consistent levels in the bleach towers and manage pulp flow to successive stages by controlling tower outlet valves. Application challenges include variable pulp density, temperatures over +200° F (+95° C), harsh chemicals, and the need for easy cleaning of wetted parts. A point level switch ensures overfill protection.
水平技術：
- Thermatel熱分散開關用於點電平
- Eclipse引導波雷達變送器，用於連續水平
PULP STOCK STORAGE
應用：紙漿庫存存儲在不同的密度horizontal or vertical “chests” that are quipped with an agitator that keeps the stock in suspension. A tower is a larger vessel that provides retention time and a down/upward flow out of pulp. Because pulp can carry residual oxidants that cause corrosion of storage vessels, vessel interiors are lined with resistant materials.
挑戰：Level measurement of storage vessels is necessary to maintain a consistent supply of pulp stock to the paper machine. Pulp vessels represent a level measurement challenge due to thick and sticky media, high temperatures, steam in the vapor space, agitation, and the slightly corrosive and abrasive effects of the slurry.
水平技術：
- Thermatel熱分散開關用於點電平
- Eclipse引導波發射器或Pulsar通風雷達變送器，用於連續水平
MIXING & MACHINE CHESTS
應用：混合胸部是一種大型攪拌的罐，用於將各種類型的紙漿，填料和添加劑混合在造紙機的特定配方中。將混合股送入機箱，在那裏它將其泵送到頭箱並均勻地分配到造紙機的移動線上。當庫存脫水並幹燥時，結果是成品紙。
挑戰：乐动体育下载級別控製確保箱子永遠不會溢出，並且電平從未在攪動區域下沉入安全水平以下。水平監測必須與紙漿厚度，高濕度和比重變化進行抗衡。隨著胸部放電操作在水平控製上，必須保持一致的流動以確保連續造紙。乐动体育下载
水平技術：
- Thermatel熱分散開關用於點電平
– ECLIPSE Guided Wave Radar Transmitter or PULSAR Through-Air Radar Transmitter for continuous level
CONDENSATE RECEIVER TANKS
應用：回收鍋爐中產生的蒸汽用於運行研磨機的許多部分。液體濃度和紙張幹燥是最大的蒸汽用戶，其次是消化，漂白和芯片蒸汽。（如果裝備磨機，蒸汽也會驅動渦輪發電機係統）。紙張機幹燥部中的蒸汽冷凝水係統收集軋機中的再利用水。
挑戰：蒸汽冷凝水冷卻滾筒進入最多可冷凝物返回係統的六個接收器罐。乐动体育下载這些罐中的水平控製確保水返回到磨機中以進行再利用，轉移到儲存或放電到下水道。當控製感測到罐中的上層時，它將致動傾卸閥以去除累積的冷凝物。
水平技術：
- 旋轉型超聲波開關，75係列密封外部籠式開關或熱電驅動開關點電平
- Eclipse引導波雷達發射器或E3模態換擋器變送器，用於連續級別
- 用於視覺指示的Atlas磁電平指示器
Discover the benefits of level control for pulp and paper process.
