石灰石-石膏濕法脫硫系統(tǒng)簡介

1、0.1Plant description脫硫島介紹The FGD plant consists of flue gas path, which includes the absorber vessel, booster fan, GGH and bypass dampers, which en sure the operati on of the boiler in two modes FGD operati onand a bypass operation. Limestone slurry preparation system gets ready the absorbent needed

2、 in the process. The only by-productis gypsum slurry, which is transported to thedewatering system consisting primary and secondary dewatering stages. Gypsum, as a byproduct of dewatering is temporary storied for further use and water is partly led back to the process, partly to the waste water trea

3、tment.脫硫島包括煙氣系統(tǒng)、 石灰漿液制備系統(tǒng)、 石膏漿液脫水系統(tǒng)、 石膏 庫和廢水處理等。 在煙氣系統(tǒng)中包括吸收塔、 升壓風(fēng)機和旁路檔板， 旁路 檔板的作用是它能夠滿足鍋爐在兩種模式下運行， 一是在脫硫島在線， 二 是脫硫島旁路。石灰漿液制備系統(tǒng)的功能是準(zhǔn)備工藝流程中所需的吸收 劑。反應(yīng)后生成的唯一的輔產(chǎn)品是石膏漿液， 石膏漿液分別經(jīng)過一級脫水 和二級脫水， 經(jīng)過脫水產(chǎn)生的輔產(chǎn)品是石膏被臨時儲存起來為以后用， 脫 出的水一部分返回系統(tǒng)中，而另一部分被送到廢水處理站。0.1.1Absorber system吸收塔系統(tǒng)A wet limestone process with forced o

4、xidation with the SO2 absorber system is used to remove flue gas SO 2 and to produce a gypsum by-product. SO 2 removal efficiency of 96% is reached for all specified boiler loads and scope of the fuels.The absorber utilizes a perforated scrubbertray and fourabsorber spray levels for SO2 removal, whi

5、ch are above the absorber tray. The absorber recirculation pumps feed separately each header when operating.在吸收塔中，濕石灰石與氧化風(fēng)機鼓送的氧氣和吸收塔中的二氧化 硫發(fā)生反應(yīng)，達到了除掉煙氣中的二氧化硫的目的，并且產(chǎn)生了唯 一的輔產(chǎn)品石膏。在指定的所有鍋爐負荷和燃料范圍內(nèi)，二氧化硫 除去率能達到 96% 。吸收塔裝備有穿孔的托盤和四個噴淋層。為了 便于二氧化硫的去除，噴淋層都安裝在托盤的上方。在運行時，吸 收塔漿液循環(huán)泵分別為每一個聯(lián)箱提供漿液。The SO 2 removal pr

6、ocess starts as the hot flue gas entering the absorber is cooled and saturated by the slurry falling from the absorption zone. The flue gas then flows through the absorber tray. The absorber tray helps the re-distribution of the flue gas to optimize the contact between the gas and the absorber. As t

7、he gas passes through the layer of scrubber slurry on the tray, the increased gas velocity, caused by tray perforations, generates a violent frothing action, thereby assuring spray zones, where absorber slurry spraying counter current to the flue gas flow completes the sulphur dioxide removal proces

8、s.當(dāng)熱煙氣進入吸收塔被冷卻，被從吸收劑區(qū)落下的漿液滲透時，去 除二氧化硫的工藝開始了。煙氣進入吸收塔之后再流過托盤，托盤 的作用是使流過它的煙氣重新分配而達到優(yōu)化煙氣與吸收劑接觸 的目的。 當(dāng)煙氣流過托盤時，托盤上的孔使煙氣加速，并且同時產(chǎn) 生強烈的泡沫，這樣就使托盤上的漿液和噴射區(qū)的漿液逆流到煙氣 流，從而完成了去除二氧化硫的工藝。The gas flows then upwards the first stage mist eliminator (ME) located near the top of the absorber. Above and below the first sta

9、ge ME are a series of headers with spray nozzles that spray process water onto the first stage of mist eliminator. These sprays keep the surface of the ME wet and wash away slurry solids reaching the ME. After passing through the first stage ME, the gas then enters the second stage ME. Another serie

10、s of headers with spray nozzles are located below the second stage ME. After passing through the second stage ME, the flue gas exits the scrubber through the outlet hood.煙氣流經(jīng)托盤后，繼續(xù)往上流向第一級除霧器，第一級除霧器靠近 吸收塔頂部。在第一級除霧器的上面和下面是一系列帶有噴嘴的聯(lián) 箱，這些噴嘴噴射出的工藝水噴濺到第一級除霧器，使除霧器的表 面保持潮濕且同時沖洗掉粘附在上面的漿液。當(dāng)煙氣通過第一級除 霧器后，流向第二級除

11、霧器，在第二級除霧器的下面也有一系列帶 有噴嘴的聯(lián)箱。 經(jīng)過第二級除霧器后， 煙氣通過出口罩排出吸收塔。The absorber slurry and ME wash water pass down through the absorber and is collected in the lower section of the absorber, which is referred to as the absorber reaction tank. Four side entering agitators on absorber reaction tank keep the absorber

12、 slurry solids in suspension. The absorber reaction tank is supplied with a absorber overflow that is designed to protect the absorber and the absorber inlet flour work from flooding and a seal box to prevent the flue gas from escaping through the overflow.石灰漿液和除霧器的沖洗水從上而下地通過吸收塔，最后匯集到吸 收塔底部的吸收塔反應(yīng)箱。在

13、吸收塔反應(yīng)箱裝有四個攪拌器，使石 灰漿液保持懸浮狀。吸收塔反應(yīng)箱帶有溢流管和密封箱，溢流管的 作用是為了保護吸收塔以防止它過滿而產(chǎn)生滿溢，密封箱作用是為 了防止煙氣從溢流管中滲出。Absorber slurry pH is controlled by the addition of fresh limestone slurry to the absorber. The amount of the limestone slurry added to the scrubber to maintain a given pH is a function of boiler load and sulph

14、ur dioxide loading. The slurry pH in the reaction tank is a function of the excess limestone in the lank, the sulphur dioxide removed and a solid residence time in the absorber reaction tank. Two redundant in-line pH probes are provided in the discharge piping of the gypsum slurry hydro cyclone feed

15、 pumps to measure scrubber slurry pH.吸收塔 PH 值是通過重新添加石灰漿液到吸收塔里來控制的。 為了維 持所給定的 PH 值，加入到吸收塔中的石灰漿液量是由鍋爐負荷和二 氧化硫負荷共同決定的。 在吸收塔反應(yīng)箱里的石灰漿液 PH 值是由在 箱里過剩的漿液、被去除的二氧化硫和石灰在反應(yīng)箱里滯留的時間 共同決定的。另外兩個內(nèi)嵌式 PH 值探頭被安裝在石膏漿液泵的出口 以測量吸收塔漿液的 PH 值。As the hot inlet flue gas is quenched, water is evaporated and carried out of the ab

16、sorber. In addition, the sulphur dioxide removal process forms solid products. These two processes result in an increase of absorber solids content, referred to in the industry as, slurry density. Absorber slurry density is controlled by the addition of ME wash water to the absorber. A density meter

17、 is located in the gypsum slurry hydro cyclone feed pump discharge pipeline measures scrubber slurry density. A signal from the absorber slurry density meter opens or closes the absorber density control valve.當(dāng)熱煙氣被淋濕時，水被蒸發(fā)并且被帶出吸收塔。另外，在二氧化硫去除過程中形成了固態(tài)物質(zhì)。這兩種進程導(dǎo)致了吸收塔里的固體 成份增加，換句話說，漿液密度增加。密度監(jiān)測儀被安裝在石膏漿液泵出

18、口，以便測量吸收塔漿液的密度。通過吸收塔漿液監(jiān)測儀發(fā)出的信號來控制吸收塔密度控制閥的開啟與關(guān)閉。The absorber is divided into a spray zone and a reaction tank below,which contains an oxidation zone. When limestone is utilized as the sorbe nt the SO 2 con vers ion in the spray zone can be described in a highly simplified form by the followi ng con

19、vers ion;吸收塔被分成噴射區(qū)和位于下部的反應(yīng)箱兩部分。反應(yīng)箱還包括一個氧 化區(qū)。當(dāng)石灰石作為吸收劑時，二氧化硫在噴射區(qū)的轉(zhuǎn)化可以用以下簡 要的格式進行描述。CaCO3 + 2 SO2 + H2OCa(HSO3)2 + CO2Then the oxidation air enters the reaction tank through oxidation air headers located next to agitators propellers. This air injected there con verts calcium sulfite to calcium sulfate

20、 in the absorber react ion tank;同時，氧化空氣通過位于攪拌器推進器旁的氧化空氣聯(lián)箱進入反應(yīng)箱， 注入到吸收塔反應(yīng)箱的空氣使亞硫酸鈣轉(zhuǎn)化成硫酸鈣。Ca(HSO 3)2 + O 2 + CaCO 3 + 3 H 2O2 CaSO 4 2H 2O + CO 2As a result of the con vers ion described above a con siderable qua ntity of gypsumis created.In order to keep the processes going the gypsum is removed from

21、the process by using the gypsum bleedi ng pumps and con veyedin to the land field.由于上述的轉(zhuǎn)化，產(chǎn)生了大量的石膏。為了使整個工藝流程繼續(xù)，就要利用石膏排出泵排出石膏，然后再把石膏送到相關(guān)的地方。Absorber吸收塔The absorber system consists of the absorber constructed of flake lined carbon steel and equipped with agitators, oxidation air nozzles, tray, spray h

22、eaders and mist eliminators. The absorber could be divide into three major parts as absorber reaction tank, absorber spray zone andclean gas zone.吸收塔系統(tǒng)是由帶有薄內(nèi)襯的碳鋼結(jié)構(gòu)的塔體、 攪拌器、 氧化噴嘴、 托盤、噴射聯(lián)箱和除霧器組成的。吸收塔可以大致被分成三大主要 部分：吸收塔反應(yīng)箱、吸收塔噴淋區(qū)和除霧區(qū)。The absorber reaction tank is geared up with following major equipment

23、 like as four agitators and grid distribution pipe for the forced oxidation of the absorber slurry. Two independent level gauges control the absorber reaction tank level. There are four recycle pump connections and two gypsum bleeding pump connections. The overflow consists of connections, piping an

24、d sealing box avoids entering of the slurry into the flow gas inlet. The staff could enter the absorber reaction tank through the maintenance door located in the lower part of the tank.吸收塔反應(yīng)區(qū)裝備有以下主要設(shè)備： 4個攪拌器、氧化空氣分布管 （為吸收塔漿液提供氧化空氣）、控制吸收塔反應(yīng)箱水位的兩個獨 立的液位計、四臺再循環(huán)泵、兩個石膏排出泵和溢流管（配有防止 漿液進入煙氣進口側(cè)的密封箱）。另外檢修人員可以通

25、過箱體下部 的檢修孔進入反應(yīng)箱。The absorber spray zone is above the sump level and consists of the perforated absorber tray made of stainless steel. The tray section is sectioned in compartments by baffles. This allows for a more even distribution of the liquid on top of the tray. After the fluegas passes through

26、the tray, it encounters the absorber spray zone. The flue gas is sprayed with absorber slurry from the headers, which are made by fiberglass reinforced plastic (FRP) and equipped by ceramic made no zzles.吸收塔噴射區(qū)位于箱體水位計之上，由開孔的不銹鋼托盤組成。盤 區(qū)被隔膜分隔成許多小隔間，這就充分考慮了，使盤體上部的液體 更加均勻的分布。當(dāng)煙氣通過托盤后，就進入了吸收塔噴射區(qū)。煙 氣和從聯(lián)箱噴

27、射出來的石灰漿液相碰撞。聯(lián)箱是用纖維玻璃加固的 塑料制作的，并且裝配有陶瓷噴嘴。The absorber clean gas zone consists of two stages mist elim in ators (ME). ME remove mist and slurry particle carried by flue gas. The primary stage captures large particles and large droplets and the sec on dary stage elimi nates fine particles and droplets.

28、 The lower stage of the ME is kept free of slurry deposits by flushi ng of the upstream and dow nstream surfaces using the process water. The upper stage of the ME is flushed of upstream surfaces only.吸收塔凈煙區(qū)是由兩級除霧器組成的。除霧器清除由煙氣帶來的霧 和漿液顆粒。第一級除霧器清除大顆粒和大水滴，二級除霧器清除 小顆粒和小水滴。一級除霧器通過工藝水對其朝上、朝下表面進行 沖洗，使石灰漿液不

29、能沉淀。二級除霧器只對朝上表面進行沖洗。Recirculati on Pumps再循環(huán)泵The absorber system is equipped with four recirculati on pumps, which feed the corresponding headers. The number of the headers being in the operati on depe nds on boiler dema nd and sulphur load at the flue gas ini et.吸收塔配有四臺再循環(huán)泵和相應(yīng)的聯(lián)箱。投入運行的噴淋層數(shù)是由 鍋爐負荷和煙氣

30、進口側(cè)的二氧化硫決定的。Oxidati on Air System氧化空氣系統(tǒng)The oxidation air system provides oxidation air, which is free of oil to the absorber reaction tank to ensure oxidizing of the absorber slurry consisting of calcium sulfite to calcium sulfate. The system con sists of two air blowers (one of them as a com mon sp

31、are), air pip ing and grid distributi on pipe.氧化空氣系統(tǒng)為吸收塔反應(yīng)箱提供無油的氧化空氣，以滿足石灰漿液的氧化，這個氧化過程包括亞硫酸鈣轉(zhuǎn)化為硫酸鈣。這個系統(tǒng)包括兩個送風(fēng)機(其中一個備用)、空氣管和氧化空氣分布管。Absorber Seal Box吸收塔密封箱The absorber is provided with a seal box to prevent slurry fromoverflowing into the flue gas iniet. An external overflow pipe connects the absorbe

32、r reaction tank to the box. This pipe removes the slurry, which is above the level into the seal box. Then the slurry can be remov ing into the absorber pit through the tren ch. The seal box provides over pressurizati on protect ion for the absorber.吸收塔配有防止?jié){液溢流到煙氣側(cè)的密封箱。外部溢流管把吸收塔 反應(yīng)箱和密封箱連接起來。當(dāng)水位高于密封箱

33、時，管道就把漿液排出。被排出的漿液通過溝道被送到吸收塔排水坑。密封箱還起著對 吸收塔過壓保護的作用。Gypsum bleedi ng pumps石膏排出泵Two gypsum slurry pumps are provided for the absorber system.One pump operates with the other pump in sta nd-by for all loads con diti ons. The pump operates continu ously and, depe nding on level, either recycle to the abs

34、orber or bleeds gypsum slurry to the gypsum dewateri ng.在吸收塔系統(tǒng)中，配有兩臺石膏漿液泵。一臺泵運行，另一臺備用。泵連續(xù)運行取決于水位、回到吸收塔的再循環(huán)或者是到石膏脫水系0.1.2統(tǒng)的石膏漿液。Flue gas duct system煙氣系統(tǒng)The flue gas system for the unit consists of flue gas ductwork, oneflue gas re-heater (GGH), one booster fan, and dampers.機組的煙氣系統(tǒng)包括煙道、一個煙氣熱交換器、一個升壓風(fēng)機

35、和檔板。The flue gas exits each unit through the two boiler s ID fans andflows through existing flue work and the bus bar to the new fluework constructed for the FGD system. Six dampers (two in the bypass ducting and four in each of the entering and exiting ducting to the FGD system) allow flue gas to b

36、ypass the FGD system and go directly to the stack. These dampers can isolate the FGD system in order to maintain boiler operation while the FGD system is offline for maintenance, inspection, etc.每臺機組煙氣都是通過鍋爐引風(fēng)機流入煙道支管和母管，然后再進 入為脫硫島提供的煙道。6個檔板（兩個在旁路煙道上，四個在脫 硫島進口和出口側(cè)）允許煙氣不經(jīng)過脫硫島而直接進入煙囪。當(dāng)脫 硫島為了檢修或檢查而停運時，這

37、些檔板可以隔絕脫硫島而不影響 鍋爐的運行。From the concrete ducting the hot dirty flue gas enters the booster fan and the n passes the inlet of the GGH. In the GGH, heat is transferred to the cool gases from the hot gases flowing in the opposite direct ion. Then, the raw gas en ters the absorber vessel and flows upward

38、through a tray and a series of sprays where the flue gas is collected and saturated with water as well as scrubbed of SO 2. Then, the clean gas passes the series of mist eliminators and enters subsequentlythe GGH, where it isreheated.從混凝土煙道來的熱臟煙氣通過升壓風(fēng)機，再通過熱交換器入口進 入熱交換器。在熱交換器里，熱煙氣通過反向流動而使熱量傳遞到 冷煙氣中。之

39、后，原煙氣進入吸收塔，向上流經(jīng)一個托盤并經(jīng)過各 層噴淋，得到飽和水分并脫除 SO2的凈煙氣經(jīng)除霧器除去夾帶液滴 后，進入熱交換器被再熱。The reheated clean gas then travels back to the existing ductingr and out the stack.再熱后凈煙氣，排至現(xiàn)有煙道，經(jīng)煙囪排放Booster fan升壓風(fēng)機An axial booster fan is located betwee n the outlet of two row gas ducts leadi ng from the bus bar and the inlet o

40、f the GGH. The fan boosts the pressure of the flue gas to en sure adequate flue gas flow through the system and out the stack. The booster fan operation is based on the ID fan downstream pressure to maintain the flue gas pressure for proper furnace pressure con trol. A forced air system provides sea

41、li ng and cooli ng of the rotor and beari ng assemblies for the booster fan. All con trol of the booster fan takes place in the DCS.一臺軸流升壓風(fēng)機被安裝在入口煙道和煙氣熱交換器進口之間，升 壓風(fēng)提升煙氣壓力以確?？朔﨔GD系統(tǒng)壓力排至煙囪。根據(jù)引風(fēng)機出口壓力，調(diào)節(jié)升壓風(fēng)壓力來維持以確保爐膛負壓。一個空冷系統(tǒng) 為升壓風(fēng)機的轉(zhuǎn)子和軸承部件提供了密封和冷卻。所有對升壓風(fēng)機 的控制都是在DCS中實現(xiàn)的。Flue gas reheati ng system煙氣再加熱系統(tǒng)W

42、hile scrubb ing process the flue gas is saturated with water andcooled down to its adiabatic saturation temperature. Before entering the existing stack the flue gas has to be reheated to protect the stack against condensates. For reheating the Gas Gas Heater (GGH) is used.在煙氣凈化的過程中，煙氣被水飽和，并被冷卻到酸露點以下

43、。因 此在進入煙囪之前，必須被再度加熱而使煙囪不結(jié)露，因此煙氣換 熱器就被運用了。The tech ni cal pr in ciple is as follow:技術(shù)原理如下：The two streams - treated and untreated flue gas that flow through diametrically opposite segments of the rotor, are separated from each other by sealing plates. The two streams flow in opposite directions while

44、 the heating elements rotate slowly through both, the streams of the treated and the untreated flow gases. The heating elements are warmed up while passing the untreated hot flue gas thorough the hot side. This energy is transferred to the treated flue gas coming from the absorber when the heating e

45、lements are passing this stream.兩股氣流 經(jīng)過凈化的煙氣和沒有經(jīng)過凈化的煙氣，直接流過熱交換器相對的扇區(qū)。這些扇區(qū)被密封板一一隔開的。這兩股氣流以 相反方向流動，而受熱元件以非常緩慢的速度通過它們，當(dāng)受熱元 件通過沒有經(jīng)過凈化的熱煙氣時被徹底加熱，被加熱過的受熱元件 再通過從吸收塔來的凈化過的煙氣時，熱量實現(xiàn)了傳遞。The GGH seal air fan ensures zero leakage of the raw gas to the environment. Seal air is injected into the labyrinth seals lo

46、cated at the main motor shaft (top and bottom) and at the pinion shaft driving the motor.熱交換器的密封風(fēng)機以確保沒有原煙氣泄漏到環(huán)境中。密封空氣被 注入到主馬達軸(頂部和下部)和驅(qū)動馬達的齒輪軸的迷宮式密封 里。A purge system minimizes the amount of untreated gas leakage that is brought to the treated flue gas side as the rotor turns. The purge system consis

47、ts of a fan, ducting and associated dampers as well as control devices, which draws a volume of treated gas from the exit side of the flue gas reheater and discharges it through a narrow slot along the entire length of the hot end redial direct gas leakage throughout the load range.在轉(zhuǎn)子轉(zhuǎn)動時，吹掃系統(tǒng)能最小化原煙

48、氣到凈煙氣的泄漏量。吹掃 系統(tǒng)包括風(fēng)機、風(fēng)道、相關(guān)的檔板和控制設(shè)備，它吸收一部分從熱 交換器出口來的凈煙氣，然后把吸收來的凈煙氣排放到分布在整個 熱端徑向密封板的狹窄的小槽中，以致在整個負荷變化范圍內(nèi)減少 煙氣的直接泄漏 .（低泄漏風(fēng)機系統(tǒng)）The air drier is provided in order to reduce the corrosion danger while outages.空氣干燥器是為了減少煙氣排放過程中產(chǎn)生腐蝕。Two combined cleaning device soot blowers and high-pressure wash located in t

49、he untreated gas inlet integral to the GGH are provided. Each device consists of a single, retractable lance and a drive mechanism equipped with separate air and water nozzles. The normal cleaning system uses air （ steam ） soot blowing three times per day. A high-pressure water cleaning facility for

50、 occasional on-line use is also provided, utilizing the soot blowing lance and traversing system. A high-pressure wash water pump boosts raw water pressure the high pressure required for on-line washing.兩種聯(lián)合使用的清潔裝置是吹灰器和高壓沖洗水，它們都位于熱交 換器的進口側(cè)并和熱交換器一道一同供貨的。每一套設(shè)備都包括有 單根可伸縮桿和一個帶有單獨的空氣通道和水噴嘴的驅(qū)動機械。通 常清潔系統(tǒng)利用

51、空氣 （蒸汽 ）吹掃一天三次，而高壓沖洗水是在特殊實現(xiàn)。高壓吹洗水泵把工業(yè)水壓力提高到在線沖洗所需的壓力。A low-pressure water clea ning facility for the eleme nts is provided for use after the GGH has come off-li ne.低壓沖洗水系統(tǒng)是在熱交換器停運后沖洗設(shè)備元件用的。Expa nsion joints膨脹節(jié)There are expa nsion joints separati ng the duct sect ion and connecting equipme nt, which

52、is separately supported. Expa nsion joints are leak proof and maintain liquid and gas tight seals with connecting equipme nt.膨脹節(jié)把煙道和所連接的設(shè)備分開，它是被獨立支撐的。膨脹節(jié)是 防泄漏的，帶有疏水，且與相連的設(shè)備之間具有氣鎖密封性。Dampers檔板There are six dampers, which are double louver type and whichare equipped with the seal air system. The seal

53、air system ensures a zero leakage by blowing air between the damper blades. The seal air fans deliver a desig n pressure that is above the operati ng pressure in the flue work.有六塊檔板，都是雙擋板并帶有密封空氣系統(tǒng)?？諝饷芊庀到y(tǒng)通過 用空氣對檔板葉片的密封來確保無泄漏。密封風(fēng)機能使空氣達到設(shè) 定的壓力，此壓力應(yīng)高于煙氣在煙道中的運行壓力。Drain age疏水The drain seal boxes are provi

54、ded for the collecti on and dra in age of conden sates, which may form in endan gered sect ion of the flue gas ducts. Conden sate as well as the wash water for the GGH is dra ined through the corresp onding drain system into the absorber pit.疏水密封箱具有對凝結(jié)水收集和排放功能。這些凝結(jié)水在極可能在 煙道部分區(qū)域里形成危險。凝結(jié)水通常為煙氣換熱器的沖洗水，

55、它 們被煙道疏水系統(tǒng)排至吸收塔排水坑。The conden sate, which may form in the in let and outlet of the absorber are led back into the absorber by corresp onding pip ing.0.1.3在吸收塔進口和出口形成的凝結(jié)水通過相應(yīng)的疏水管道導(dǎo)回吸收 塔內(nèi)。Absorbe nt preparati on system吸收劑制備系統(tǒng)Raw limestone ( 10mm)from one of the boundary through a series transportation

56、 device to two limestone silos.limestone is dischatged from the gravimetric feeder to the mill.There are two gravimetric feeders and two mills.石灰石原料(粒徑w 10mm)由界區(qū)經(jīng)一系列轉(zhuǎn)運提升裝置送至兩個 石灰石碎石倉，分別由兩條稱重皮帶給料機送至兩臺磨機。Two 19.5t/h horizontal ball mills take the raw limestone and crush it by means of tumbling carbon

57、steel balls. The mill grinds the solids to a paticle size of 90% passing 250 mesh.Reclaim water and oversize slurry particles from the classifiers are also fed into the ball mill. In the mill, the crushed limestone and reclaim water mix together to form fresh limestone slurry.兩臺能力為 19.5t/h 的臥式磨機， 通過

58、鋼球研磨將石灰石磨成粒徑為 90通過 250目。濾液回收水以及旋流器分離下來超尺寸的物流也 進入磨機系統(tǒng)，研碎的石灰石和回收水一起混合成新鮮漿液。Fresh limestone slurry is gravity fed from the ball mill trammel screen into a dedicated ball mill product tank serves as a temporary storage for the limestone slurry before being fed to the classifier.Reclaim water is also fed

59、 into the ball mill product tank to maintain a constant slurry density.One ball mill product pump per ball mill feeds the limestone slurry to a dedicated classifier. 新鮮漿液由磨機出口自流入磨機漿液循環(huán)箱，該設(shè)備為轉(zhuǎn)運漿液的 緩沖箱。濾液回收水補入將液箱用于維持漿液恒定密度，磨機漿液 循環(huán)泵用于轉(zhuǎn)運一臺磨機的漿液到石灰石旋流器。Two classifiers (one per ball mill)receive the limes

60、tone slurry from the ball mill product pumps.The centrifugal forces induced by the flow pattern in the classifier cyclones cause the oversized slurry particles to be removed into the classifier underflow launder,while the smaller sized slurry particles exit through the top of the cyclones into the o