Cov txheej txheem tom qab kev kho mob kuj yuav tsum tau tswj xyuas

SCR aftertreatment system yog dab tsi? 

Nyob rau hauv qhov kev txiav txim ntawm catalyst, SCR txhaj txo tus neeg sawv cev ammonia lossis urea kom txo NOx hauv cov pa tso rau hauv N2 thiab H2O, kom ua tiav lub hom phiaj ntawm kev txuag hluav taws xob thiab txo qis emission.

SCR cov qauv kev ua haujlwm kuj tseem yooj yim, tsuav yog cov txheej txheem ntawm urea reductant tau ntxiv rau lub hauv paus ntawm lub cav, thiab tom qab ntawd cov tshuaj urea aqueous tau ntxiv tsis tu ncua. Tsis tsuas yog cov thev naus laus zis no txhim kho tsheb kev lag luam roj tsheb, nws tseem pab txuas ntxiv cov kev pabcuam ncua sijhawm.

Tom qab cov pa pa tawm los ntawm lub turbine, nws nkag mus rau hauv cov yeeb nkab sib tov. Lub urea metering txhaj tshuaj yog ntsia rau ntawm cov yeeb nkab sib xyaw, thiab cov tshuaj urea aqueous raug txhaj. Cov urea undergoes hydrolysis thiab pyrolysis ntawm qhov kub thiab txias los tsim NH3, thiab NH3 yog siv rau saum npoo ntawm SCR system catalyst kom txo NOX, tawm N2.

Lub kaw lus feem ntau suav nrog urea twj, urea nozzle, urea tank, thiab lwm yam, yog li kev saib xyuas ntawm SCR system feem ntau tsom rau peb yam.

● SCR tom qab kev kho mob cov lus qhia saib xyuas

1. Kev tu lub twj tso kua mis urea 

Txij li thaum muaj cov kua seem nyob hauv lub twj tso kua mis urea thiab cov raj xa dej tom qab lub tsheb nres ua haujlwm, nws yog ib qho tsim nyog yuav tsum tau ua haujlwm ua haujlwm tom qab lub tsheb raug kaw kom tsis txhob muaj crystallization lossis khov.

Tag nrho cov urea dosing twj tso kua mis muaj cov ntxaij lim dej los yog lim cov ntsiab lus, uas yuav tsum tau ntxuav los yog hloov tsis tu ncua raws li cov kev cai, txwv tsis pub nws yuav ua rau blockage los yog puas thaum lub sij hawm, ua rau poob ntawm filtering nyhuv, uas yuav inevitably ua rau lub cev malfunction.

2. Kev tu cov urea nozzle

Yog hais tias qhov zoo ntawm lub tsheb urea tov tsis zoo txaus, qee cov impurities insoluble thiab cov khoom muaj nyob rau hauv lub tsheb tsis zoo urea tov tej zaum yuav sib sau thiab yuav thaiv thiab rhuav tshem cov urea nozzle.

Tsis tas li ntawd, qhov ua rau ntawm qhov txhaws ntawm lub urea nozzle kuj tseem tuaj yeem tshwm sim los ntawm cov seem seem hauv cov tshuaj tiv thaiv urea ntawm lub tsheb, yog li peb feem ntau yuav tsum tau tuav lub urea nozzle thiab ntxuav cov urea nozzle nquag. Kev ywg dej kub tuaj yeem siv tau.

Thiab cov injectors yog ua los ntawm 304 stainless hlau nrog ib tug ceramic core. Tsis txhob tso lub nozzle thaum ua haujlwm, vim qhov no yuav ua rau cov txheej txheem ceramic puas.

3. Kev tu lub tank urea

Qhov siab tshaj plaws ntawm lub tank urea yuav tsum tau ntim nrog urea tov rau 100 feem pua ​​(90 feem pua ​​​​ntawm lub caij ntuj no thaum qhov kub thiab txias), thiab thaum cov tshuaj urea tau noj rau 20 feem pua, cov tshuaj urea yuav tsum tau ntxiv; thiab qib urea yuav tsum tau kuaj xyuas txhua hnub; thiab seb cov tshuaj urea yog to.

Thaum lub cav raug tswj xyuas txhua xyoo, qhib lub hauv qab ntawm lub tank urea los ntxuav, thiab tso cov av hauv lub tank. Nws kuj tseem yuav tsum tau kuaj xyuas ib ntus yog tias muaj cov pob zeb dawb pom nyob rau ntawm lub qhov cua valve lossis cov kua filling chaw nres nkoj, uas tuaj yeem muab yaug nrog dej huv lossis so nrog cov ntaub ntub dej. Yog tias pom tias lub qhov hluav taws xob tau thaiv, nws tuaj yeem raug ntxuav lossis hloov nrog dej huv. Tsis tas li ntawd, hloov cov ntxaij lim dej hauv lub thawv txhua 2 mus rau 3 xyoos, thiab xyuas seb cov plug-in thiab cov yeeb nkab txuas puas yog nyob rau qee lub sijhawm.

Raws li ib txwm muaj, muaj ntau qhov xwm txheej ntawm SCR post-processor hloov los ua ke. Yuav kom txuag tau tus nqi tsav tsheb, nws yog ib qho tsim nyog yuav tsum tau ua kom huv si thiab tswj xyuas SCR system thiab xaiv cov tsheb urea txhim khu kev qha. Nws yuav tsum raug sau tseg tias SCR tom qab ua tiav cov txheej txheem muaj cov kev cai nruj ntawm kev sib raug zoo ntawm txhua lub rooj sib txoos, thiab cov chaw tsim khoom tau teeb tsa nws hauv ib qho qauv, yog li txhua tus neeg yuav tsum tau saib xyuas thaum tu thiab tswj nws, tsis txhob hloov nws. txoj hauj lwm.