片堿濃度高低決定了產(chǎn)品的價(jià)格，濃度越高的產(chǎn)品價(jià)格越高，含有的雜質(zhì)越少。那么什么因素會(huì)影響片堿的濃度呢?這個(gè)一般是在生產(chǎn)過程中一些系統(tǒng)、設(shè)備、濃縮過程等因素會(huì)影響，具體影響片堿的濃度的因素往下了解。
The concentration of flake alkali determines the price of the product. The higher the concentration, the higher the price of the product, and the less impurities it contains. So what factors will affect the concentration of schistine? This is generally affected by some systems, equipment, concentration process and other factors in the production process. The specific factors that affect the concentration of flake alkali will be understood later.
什么因素會(huì)影響片堿的濃度?
What factors will affect the concentration of schistine?
(1)蒸發(fā)系統(tǒng)生產(chǎn)負(fù)荷對(duì)片堿濃度的影響。
(1) Influence of production load of evaporation system on the concentration of flake alkali.
生產(chǎn)Ⅱ效蒸發(fā)器的堿液溫度應(yīng)控制在(143+1)C,堿質(zhì)量分?jǐn)?shù)為50%~51%。校驗(yàn)了工藝控制點(diǎn)對(duì)應(yīng)的儀表,連續(xù)檢測(cè)了Ⅱ效蒸發(fā)器的工藝數(shù)據(jù),結(jié)果顯示50%堿溫度、濃度均在工藝要求范圍。說明蒸發(fā)系統(tǒng)生產(chǎn)是穩(wěn)定的,對(duì)后期的片堿濃度沒有影響。
The alkali liquor temperature of the second effect evaporator should be controlled at (143+1) C, and the alkali mass fraction should be 50%~51%. The instrument corresponding to the process control point was calibrated, and the process data of the second effect evaporator were continuously detected. The results showed that the temperature and concentration of 50% alkali were within the process requirements. It shows that the production of evaporation system is stable and has no effect on the concentration of flake alkali in the later stage.
(2)蒸汽進(jìn)入熔融堿沿線的設(shè)備、管道、影響了堿濃度。
(2) Steam enters the equipment and pipelines along the molten alkali, affecting the alkali concentration.
更終濃縮器、熔融堿罐、片堿機(jī)及熔融堿管道,在工藝設(shè)計(jì)上均采用中壓蒸汽伴熱,如果閥門泄漏,蒸汽可能進(jìn)入熔融堿系統(tǒng),這樣就會(huì)導(dǎo)致片堿濃度降低。為此打開終濃縮器蒸汽包封,對(duì)熔融堿罐、片堿機(jī)及熔融堿管道進(jìn)行蒸汽吹掃，未發(fā)現(xiàn)蒸汽泄漏。為此,排除了蒸汽閥門內(nèi)漏對(duì)片堿濃度造成的影響。
The final concentrator, molten alkali tank, flake alkali machine and molten alkali pipeline all adopt medium pressure steam heat tracing in process design. If the valve leaks, the steam may enter the molten alkali system, which will lead to the reduction of flake alkali concentration. For this reason, the steam envelope of the final concentrator was opened, and the molten alkali tank, flake alkali machine and molten alkali pipeline were steam purged, and no steam leakage was found. Therefore, the influence of internal leakage of steam valve on the concentration of flake caustic soda is eliminated.
(3)更終濃縮器堿負(fù)荷對(duì)片堿濃度的影響。
(3) Effect of final concentrator alkali load on flake alkali concentration.
為保證片堿濃度,進(jìn)行了如下調(diào)整:①增加熔鹽在終濃縮器進(jìn)口和出口的溫度差;②保證生產(chǎn)負(fù)荷在設(shè)定(3.3m/h)范圍內(nèi);③提高熔鹽溫度,將原設(shè)計(jì)的熔鹽爐出口溫度由425C提高到427C，片堿質(zhì)量分?jǐn)?shù)由98.5%提高至99.3%。通過時(shí)間的觀察,發(fā)現(xiàn)提高片堿濃度后片堿結(jié)塊現(xiàn)象并無明顯改善。
In order to ensure the concentration of flake alkali, the following adjustments were made: ① increase the temperature difference between the inlet and outlet of the final concentrator; ② Ensure that the production load is within the set range (3.3m/h); ③ Increase the molten salt temperature, increase the outlet temperature of the original designed molten salt furnace from 425c to 427c, and increase the mass fraction of flake alkali from 98.5% to 99.3%. Through the observation of time, it was found that the agglomeration of flake alkali was not significantly improved after increasing the concentration of flake alkali.
