New type alkali recovery reduces boiler ash analyzer d virtue unplanned downtime

In recent years, in addition to improve the efficiency of pulp mill, environmental factors and the growing attention to renewable energy also promoted the recovery boiler capacity increase.Boiler which is developed and designed for power generation, recovery boiler steam parameters (temperature and pressure) is low, so the steam power conversion rate is low.Although in the past decade, the liquid solid fuel to produce steam kg per kg rate actually increased by more than 20%, but the recovery boiler is still restricted to the characteristics of fuel/ash and overheat equipment corrosion resistance of materials under these conditions.

Valmet Ash Balance Advisor application can calculate corrosion risk, and you need to deal with the Ash from or component.It can also calculate the related cost of sodium, and reduce the main steam temperature, the loss of the electricity.can
On the basis of the operating costs as low as possible to control the operation.

Non process elements (NPE) can lead to serious corrosion

As chemical pulping plant recovery becomes more efficient, the maximum extent to reduce emissions, waste liquid and waste gas, for liquid circulation in the accumulation of non process elements (NPE) brought a considerable challenge.The largest potential risk to recovery boiler, NPE is the element chlorine (Cl) and potassium (K), which in high concentrations can lead to serious corrosion of recovery boiler heat exchanger.They also lowered the boiler fly ash melting temperature, increase the flue gas channel is the possibility of contamination or clogging.

Ash handling helps to reduce the content of harmful elements and potassium chloride

Ash treatment can reduce the harmful element chlorine and potassium content, while retaining the valuable elements of sodium, reduce the environmental impact, compared with the ash discharge, from closed in the process of removing ash less.Unfortunately, ash handling is generally based on limited and incomplete laboratory testing, not about when to start working with alkaline ash or ash discharge standard operating procedure.

Through the analysis of analyzer 25 days, and the same period the ash melting temperature calculation, to make the electrostatic dust removal ash balance.

Sodium is very expensive, low ash too much or processing efficiency significantly increase operating costs.However, if the lack of ash handling.Recovery boiler may be blocked, increasing the blowing steam consumption, in the worst cases, can cause superheater corrosion and increasing water demand, and related production stoppage.To understand more of ash composition and ash content processing workshop is to improve recovery boiler control key, so as to improve the efficiency of the boiler operating ratio and usability.

To reduce risk, optimize cost balance

Recently launched the d virtue Recovery boiler Ash content Analyzer Valmet Recovery Ash Analyzer provides an innovative online solutions, used in electrostatic precipitator (ESP) in measuring Ash composition.It sustainable measuring carbonate (CO3), sulfate (SO4), chlorine (Cl), potassium (K) and a full range of chemical equilibrium of the concentrations of sodium (Na), and calculate and determine the scale and corrosion risk of critical ash melting temperature.

With solid stainless steel sampler structure, from the ash after alkaline ash conveyor belt for samples of electrostatic precipitator ash content on the chute.

维美德灰分平衡分析软件 Valmet Ash Balance Advisor 提供灰分平衡和锅炉运行参数的在线视图，为灰处理量提供运行目标，同时将钠损失和运行成本保持在最佳水平。从而提高了回收回路中氯和钾的去除率，同时优化了新鲜化学品补充和电力生产之间的成本平衡，同时延长了锅炉清洗时间间隔。

Author: Nigel Farrand