Yuav ua li cas kom tsis txhob muaj urea crystallization

Urea crystallization tsis ua haujlwm yog ib qho yooj yim tshwm sim nyob rau hauv qhov chaw txias, tshwj xeeb tshaj yog nyob rau lub caij ntuj no. Hauv ntau thaj chaw nyob rau sab qab teb, tsuav yog qhov kev ua haujlwm tsis raug cai, lub kaw lus yuav tsis muaj teeb meem. Qhov no yog vim qhov chaw khov ntawm urea yog -10 degree . Hauv cov cheeb tsam uas qhov kub thiab txias qis dua qhov ntsuas kub no, SCR tom qab kev kho mob yuav tsum muab thawing thiab sov-kub ntsuas rau urea aqueous tov, txwv tsis pub nws yuav ua rau urea crystallization.

Thaum lub ntsuas kub ntawm urea pom tias qhov ntsuas kub ntawm urea qis dua 0 degree, cov cua sov solenoid valve ntawm qhov kev ua haujlwm tom qab tau qhib los ua kom cov dej txias kom sov cov urea kom txog thaum nws tsis ua haujlwm ntawm 7 degree.

Cov tshuaj urea yog thawed los ntawm cua sov lub cav coolant. Lub tshav kub exchanger yog teem rau hauv lub tank urea, thiab cov urea nyob rau hauv lub tank urea yog rhuab thiab de-iced los ntawm lub tshav kub hloov lwm lub tsev ntawm lub high-kub coolant nyob rau hauv lub engine dej lub tsho, uas yuav tsum tau lub cav yuav tsum tau warmed, thaum lub sij hawm lub engine. cav coolant kub mus txog 70 degree, nws tuaj yeem nkag mus rau lub tshav kub exchanger kom sov cov urea.

02. Urea siv lead ua

Thaum lub urea gas-kua mixing channel raug thaiv, lub siab nyob rau hauv lub mixing chamber yuav nce, thiab lub siab zog yuav ua rau cov roj-kua sib tov (muaj urea tov) khiav mus rau lub compressed cua channel, thiab cov urea tov yuav evaporate. noo noo nyob rau hauv compressed cua channel, ua rau urea crystals, uas thaiv cov huab cua.

03. Urea raj crystallization

Muaj 3 cov kav dej urea nyob rau hauv qhov kev txhaj tshuaj urea, uas yog cov kav dej ua kua (txuas los ntawm lub tank urea mus rau urea twj tso kua mis), cov kav dej txhaj tshuaj (los ntawm lub twj tso kua mis urea sib dhos rau lub injector) thiab cov kav xa rov qab (los ntawm cov tshuaj txhaj tshuaj. rau urea tank).

Txhawm rau daws qhov teeb meem ntawm urea tube crystallization, hluav taws xob cua sov feem ntau yog siv rau cua sov. Thaum cua sov thiab thawing yuav tsum tau, tom qab-ua txheej txheem tswj chav tswj cov cua sov relay kom rub rau hauv, thiab cov khoom siv cua sov pib cua sov thaum nws energized. Nyob rau hauv txoj kev no, cua sov yog ceev, cov txheej txheem yog yooj yim, thiab nws tsis cuam tshuam los ntawm cov qauv ntawm tag nrho lub tsheb.

Hluav taws xob cua sov urea raj yog tsim los ntawm urea-resistant nylon raj, cua sov chav tsev, ceev connector, xov hlau hlua thiab connectors. Thaum lub ambient kub qis dua -5 degree, cov cuab yeej tswj tau siv lub tsheb fais fab mov (24V) kom sov thiab thaw nws, thiab cov raj xa dej tau rhuab los ntawm cov cua sov thiab thawing lub tswv yim tswj kom tiv thaiv cov urea kua los ntawm crystallizing. nyob rau hauv ib puag ncig uas tsis kub. Urea cua sov pipelines tuaj yeem muab faib ua ob hom hauv qab no:

1. Cov cua sov xaim xaim yog qhwv ib ncig ntawm sab nraud ntawm urea tube phab ntsa los ntawm winding tsis kam xaim, nrog rau kev tsim hluav taws xob tas li, tab sis muaj teeb meem ntawm kev faib hluav taws xob tsis sib xws;

   
   

2. Cov cua sov txheej raj siv cov nylon PA12 raws li cov khoom siv cua sov, uas yog rhuab sib npaug, cov raj xa dej muaj PTC cov yam ntxwv, lub raj xa hluav taws xob tuaj yeem txo nrog qhov nce ntawm qhov kub thiab txias kom tsis txhob muaj cov kav dej kub dhau, cov khoom ntev tsis txwv, thiab nws tuaj yeem siv ntau txoj hauv kev. Ntau cov duab ntawm cov kav dej yog qhov yooj yim rau kev teeb tsa, thiab cov urea yeeb nkab txuas yog muab nrog cov cua kub clips.

04. Lub nozzle sib txuas yog thaiv

Yog tias kev txhaj tshuaj urea nres tom qab ib lub sijhawm, urea crystals tuaj yeem sib sau ntawm qhov sib koom ntawm cov yeeb nkab urea thiab lub nozzle lossis ntawm qhov sib koom nrog lub twj tso kua mis, thaiv cov raj xa dej. Qhov no feem ntau yog vim tias muaj lub kaum sab xis tuag ntawm urea kab sib koom ua ke thiab lub nozzle lossis lub twj tso kua mis sib txuas, thiab qee qhov ntawm cov tshuaj urea aqueous yuav khaws cia rau hauv lub ces kaum tuag. Nyob rau hauv cov xwm txheej ntawm kev txhaj tshuaj tsis tu ncua, cov tshuaj urea aqueous sib sau ua ke yuav evaporate cov dej thiab precipitate urea crystals, uas yuav ua rau kom muaj kev cuam tshuam ntawm cov channel. .

 05. Kev thaiv los ntawm kev txhaj tshuaj me me ntawm urea

Yog tias qhov kev txhaj tshuaj urea tsawg tsawg, txwv tsis pub txhaj tshuaj tom qab ib lub sijhawm yuav ua rau urea muaju tuaj yeem nkag mus rau hauv cov pob qij txha thiab cov qhov nozzle. Cov dej hauv urea aqueous tov evaporates yooj yim dua nyob rau hauv cov xwm txheej zoo li no, ua rau cov kua urea cais tawm, ua rau urea crystallization. Cov urea crystals lawv tus kheej tuaj yeem thaiv cov channel, thiab tuaj yeem dhau los ua biuret lossis cyanuric acid ntawm qhov kub siab, ob qho tib si uas nyuaj rau tshem tawm.

Cov txheej txheem urea crystallization cuam tshuam nrog kev ua haujlwm ntawm lub cev thiab tshuaj lom neeg, cov txheej txheem nyuaj, thiab nws nyuaj heev los txhim kho. Nyob rau hauv qhov chaw uas qhov kub thiab txias tsis dhau, lub tank urea yog rhuab los ntawm lub cav antifreeze, tab sis nyob rau hauv cov cheeb tsam txias, urea crystallization teeb meem yuav daws tau zoo los ntawm kev siv lub urea raj siv hluav taws xob cua sov.