回收燃烧：根据黑液回收锅炉咨询委员会(BLRBAC)的认证，“折射计已被证明完全可用于黑液回收锅炉系统”。折射计的应用可以有效的保证燃烧安全以及降低对锅炉的腐蚀等侵害。
黑液浓度：太低，炉内的热量要去蒸发黑液中的水分，炉温低，燃烧不正常，这是导致闷黄牛的一个原因；太高，泵输送和雾化困难，流量不稳定，易堵塞，影响正常燃烧。但在泵的性能允许的情况下，尽量提高黑液浓度，可改善炉子性能。
预防爆炸等事故的发生必须保证进记浓度稳定，稀黑液不准进炉。



BLRBAC成员

折射计早已被证明适用于黑液固形物含量的检测。折射率相对于黑液浓度的线性变化使测量浓度变得相对容易和精确。折射计可以测量出真实的固形物含量，而不受气泡、夹带的空气或悬浮物的影响。这种基于微处理器、易操作的设计允许您非常方便地将折射计集成在您的监视或控制系统中。
折射计应用的重要区域是纸浆洗涤操作。通过监视洗浆装置出口处的浓度以满足蒸发器工艺过程的需要。此种应用安装非常方便，并且极大地减少了手工采样的工作量。
在蒸发器中，浓度和温度输出信号可以用于监视蒸发效率、检测问题和运行的经济性。浓缩好的浓黑液在进入储罐和碱炉前必须检测固形物含量（浓度），以确保操作人员和碱炉安全。





各种管径的隔离阀。

美国EMC 公司在造纸行业使用折射计精确测量绿液密度已有超过30年的历史。EMC具有丰富的仪器自动清洗应用经验以解决绿液易结垢的问题。从传统的手工清洗，到盐酸清洗，所有的这些方法要么劳动强度大，要么只是在局部有效。
由EMC公司发明的最具有革新技术的高压清洗器，已被成功应用在无数绿液装置中。这个系统由折射计按设定时长启动，并在管道上使用一个小的高压水喷射装置。高压泵产生高达2800psi(193bar)的水压去冲洗兰宝石棱镜，从而清洗掉兰宝石棱镜上累积的结垢物。由于保持清洁的光学界面，折射计可以非常精确地测量和控制绿液的密度。
从碱炉绿液溶解槽将绿液输送到苛化工段澄清器的输送管道很容易结垢，其结垢速度和绿液密度相关。因此，此工段一个共同配置是设置二路绿液输送管道，一路用于绿液输送时，另一路用稀液反清洗。此二路管道一定时间后相互切换，以延缓管道结垢。此二管路配置对于MPR 双E-Scan折射计配备HPC-2高压清洗系统来说是最理想的。根据哪个管道现在正在用于控制，相应的传感器的输出信号则被用于控制。由于两个传感头均由一个高压泵清洗，并且这个完整的系统由一个电子控制器来控制，因此，实践也证明，这套系统对于控制绿液密度来说才是最有效的方法。



折射计用于测量进碱炉高浓度黑液中固形物含量,浓度一般为50-80%。折射计用于监测输送到
碱炉喷嘴的黑液中固形物含量是非常必要的。
根据黑液回收锅炉咨询委员会(BLRBAC)的认证，“折射计已被证明完全可用于黑液碱炉系统”。
折射计成为黑液安全燃烧系统的一个重要部件。
监视进碱炉黑液的浓度需要两台独立且互为备份的折射计组成的一个监视系统。监视转移系统
使用管理电路监视折射计的正确运行，并且在检测到故障时执行特定逻辑功能。这个系统最重要的作用就是当检测到故障时，黑液能自动地从炉膛转移到再循环回路直到故障被解决。
折射计即可用于测量来自于黑液储罐的高浓度黑液进入碱炉的浓度，也可广泛用于圆盘蒸发器
或旋风蒸发器，用于监视直接接触的蒸发系统的执行性能。
当折射计用于回收碱炉时，工艺过程变得更有效率，而且更重要的是，变得更安全了。



Overview:
The current black liquor off-line test method has the following shortcomings:
labor-intensive, and the test results vary from person to person can not be repeated.
Black liquor off-line test method, the hand-held refractometer is the most inaccurate and not recommended.
The handheld refractometer critical angle refractive technology to measure the refraction of light to measure the concentration, can only be tested dissolved in black liquor solids.
The DSA concentration of the E-Scan instrument calibration for black liquor, the simultaneous measurement of a sample of the refracted light and reflected light, and thus accurate measurement of the concentration of black liquor.
The DSA E-Scan is a guarantee of safety of black liquid caustic soda furnace combustion, can greatly reduce the amount of labor accurate measurement of black liquor.
Moisture meter defects:
A lot of pulp mill black liquor concentration of moisture meter off-line test.
The resulting data of this test method is very dependent on the operating process.
Only 1% of the highest accuracy of such measurement methods.
Average need to test a few samples.
Test value fluctuation causes: aging and wavelength of infrared light bulb change, the heating unit is higher than sample samples sampling of the different distribution of samples in the test plate.
The test results will be frequent changes. A lot of pulp mill black liquor concentration of moisture meter off-line test.
The resulting data of this test method is very dependent on the operating process.
Only 1% of the highest accuracy of such measurement methods.
Average need to test a few samples.
Test value fluctuation causes: aging and wavelength of infrared light bulb change, the heating unit is higher than sample samples sampling of the different distribution of samples in the test plate.
The test results will be frequent changes.
Oven drying method defects:
Customers also commonly used oven drying method to test black liquor.
This method measured the black liquor is also very unreliable.
The test results will usually produce large fluctuations.
Accuracy of less than 1%.
Usually requires multiple sampling test average.
Fluctuations reasons: overheating caused by the decomposition of organic matter in the black liquor samples, there is no consistent, steady heating means, the different position and orientation of the sample in the oven will change the test results.
Test results with testing and frequent fluctuations.
Hand-held refractometer defects:
Handheld refraction meter test black liquor is the most unreliable.
Hand-held refractometer is only the judgment of the refraction of light opaque liquid refraction critical angle in order to determine the black liquor is inaccurate, low reproducibility.
Only in specific temperature testing.
The range is small.
Low accuracy.
Different operators would arrive at different results.
The only measure of dissolved solids.


More attention to
The the From BLRBAC "security in the recovery boiler combustion of black liquor the best recommended method" 4.1 part:
The first condition for safe combustion of black liquor is correct, accurate and reliable test of the black liquor solids content of black liquor into the nozzle.
(1) When any refractometer measured solids content of less than 58% must occur automatically black liquor steering.
When two refractometer readings are less than 58% must automatically black liquor steering.
EMC concentration of black liquor refractive index instrument in line with the U.S. BLRBAC requirements, testing black liquor an accuracy of 0.3%, and repeatability of 0.15%.
Test concentration of black liquor off the nominal accuracy of1% is unacceptable.
The black liquor automatic steering system for the safe design - to ensure that water does not come into contact with alkali furnace carbon bed is not specific for the analysis of liquid components.
Accuracy - Security - depends on the reproducibility of the system itself.
Automatic refractometer to measure the reflected light diagram
Reflected light - not the refraction of light - to be measured.
From the measured liquid color and transparency effects.
Wide temperature range, automatic temperature compensation.
For black liquor, in particular calibration.
The test results are not due to the operating personnel and process changes and fluctuations.
The DSA E,-Scan
Precision: the black liquor test within two minutes, up to + / - 0.1% accuracy.
Black liquor solids content range: 0 - 85%.
Desktop, digital display, automatic reflected light test.
Sample slots can be auto-heating.
For black liquor from the calibration and automatic temperature compensation.
Conclusion
What is the best technology for offline testing of black liquor?
Resolution of the instrument does not mean that the test accuracy.
More important are:
DSAE-Scan 0.1% of the high precision and high reproducibility.
Low precision and instability of alternative testing methods.
8 hours / test intervals, need high-precision test as a guarantee.
The DSA E-Scan fast to accurately predict the test results can help customers improve production efficiency.
Reference: TN Adams, WJ of Frederick, TM Grace, M. Hupa, K. The by Lisa, AK Jones, H. Tran (1997). Kraft recovery boiler - U.S. Pulp and Paper and Paper Industry Technology Association published
JP Holman (2001). Experimental Methods for Engineers - 7th ed. New York, NY: McGraw-Hill.
JR Lavigne, (1972) paper industry Instrument, San Francisco, CA: Miller Freeman Publications,
Recovery boiler safe combustion of black liquor the best recommended method (October 2002/March 2003). Black liquid caustic soda furnace Advisory Committee BLRBAC
Please update the concept: only calibrated for black liquor DSA E-Scan technology, measuring the reflected light to test the black liquor is the most accurate, stable, fast black liquor off-line test.

鲜明的优点：
1、 出厂校准和自动温度补偿，直接投入使用，无需现场校准；
2、 分体式设计，产品更耐震动和高温、测试更稳定、使用寿命更长；
3、 光学系统完全密闭，杜绝外界光线干扰；
4、 内置温度传感器，杜绝温度传感器意外损坏；
5、 标配温度信号模拟输出，便于客户集成控制；
6、 测量值历史曲线记录，测试稳定性一目了然；
7、 大尺寸高清晰度背光彩色LCD显示；
8、 本安型探头传感器；
9、 标配带清洗外接接口安装底座，可能的清洗方便直接；