Coke Reactivity Detection Problems Quality evaluation of coke reactivity of coke

Hello: The data detected by the coke reactivity testing equipment is biased (CRI:R> may be due to the following reasons:

1. Causes of N2 and CO2 gas flow:

1. The gas flow rate is not enough: the flow rate of N2 and CO2 gas (N2=) should be fully detected.

2. The ventilation time is wrong: CO2 reaction time (120min).

3. Gas leakage: The gas control circuit should be comprehensively checked for leakage.

Second, the reason for the temperature of the heating furnace:

1. Thermocouple position: whether the thermocouple is placed in the center of the sample, i.e., coke, should be comprehensively checked.

2. Thermocouple accuracy: The thermocouple should be sent to the technical department for testing, because some thermocouple errors exceed the standard, such as the N-type ordinary couple error is 1100, and the error is 1100 when the error alone exceeds the coke reactivity system error 1100 5 required by the national standard.

3. Heating control system: Check whether the heating closed-loop PID control system controls the temperature within the range of 1100 5 (constant temperature state).

4. Heating rate: Check whether the heating closed-loop PID control system controls the heating rate within the range of 8 16 min (heating state).

3. Reasons for the constant temperature zone:

1. Constant temperature area: the constant temperature area should be comprehensively checked, if the constant temperature area does not meet the national standard, it will lead to the heated sample can not be completely placed in the constant temperature area, that is, the heated sample can not be heated at the constant temperature of 1100 5, resulting in deviation of the test results. The smaller the constant temperature zone, the greater the deviation of the detection results, i.e., CRI:

r >。In severe cases, the deviation of the test result will be more than 5%.

2. Furnace temperature: The technical testing department should be required to test the equipment on site to check whether the temperature of the furnace constant temperature zone is 1100 5.

ICE boys.

QWW31 BRIC A You guys, it's 1, you're really disgusting?

The answer is correct, but it's not what you want to say, ha...

Too lazy to talk about a few of you, scheming tirade.

Cover your ears and steal the bell, deceive yourself and others.

I hope you write more questions like this, I'm in this business, but I really don't know how to choose.

1. Sulfur in coke: Sulfur is one of the harmful impurities in pig iron smelting, which reduces the quality of pig iron. In steelmaking, pig iron with a sulfur content greater than is considered a waste product.

11% of the sulphur brought into the furnace by the blast furnace charge comes from ore; from limestone; From coke, so coke is the main sulfur in the charge**. The sulfur content of coke has a direct impact on blast furnace ironmaking production. When the sulfur content of coke is greater than that, the sulfur content increases, the amount of coke used increases, the amount of limestone added, the amount of ore added increases, and the output of the blast furnace decreases, and the sulfur content of metallurgical coke is not more than 1%, and the sulfur content of metallurgical coke used in large and medium-sized blast furnaces is less than .

2. Phosphorus in coke: The phosphorus content of metallurgical coke used in ironmaking should be as follows.

3. Ash in coke: The ash content of coke has a significant impact on blast furnace smelting. An increase in coke ash content of 1% increases the amount of coke by 2 – Therefore, a reduction in coke ash content is necessary.

4. Volatile matter in coke: The maturity of coke can be judged according to the volatile content of coke. If the volatile content is greater than that, it means coke; If the volatile content is less than that, it means that it is overfired, and the volatile content of mature metallurgical coke is about 1%.

5. Moisture in coke: moisture fluctuations will make the coke measurement inaccurate, which will cause fluctuations in furnace conditions. In addition, the increase of coke moisture will make M04 high and M10 low, which will bring errors to the drum index.

6. Sieving composition of coke: the particle size of coke is also very important in blast furnace smelting. In the past, China's requirements for coke particle size were:

For large coke ovens (1300-2000 square meters), the coke particle size is greater than 40 mm; The particle size of medium and small blast furnace coke is greater than 25 mm. However, the current test of some steel mills shows that the coke particle size is better at 40-25 mm. Coke larger than 80 mm should be pelletized so that its particle size range does not change much.

In this way, the coke lumpiness is uniform, the void is large, the resistance is small, and the furnace condition is running well.

The thermal strength of coke is a mechanical strength index (CSR%) that reflects the thermal properties of coke. It expresses the ability of coke to resist crushing and abrasion when subjected to thermal stress and mechanical force at the temperature and atmosphere of the environment in which it is used.

What do you mean by the data obtained from the results of the coke reactivity test?

In fact, there are many factors that affect the test data, from the beginning of coke sample preparation to the end of the test, there are many factors that will exist in both human and equipment.

1) First of all, it is related to the coke sample preparation before the reactivity test, because the current laboratory uses manual sample preparation, there will be a certain human factor in it, which will lead to the deviation of the test data. (Here I recommend a device to avoid human factors in the sample preparation process, HXZY coke pellet sample preparation machine, which is developed by Shangyu Hongxing Machinery Instrument Manufacturing ****.) ）

2) The reaction test is related to the amount of carbon dioxide (reaction gas) gas flow.

If the flow rate of carbon dioxide gas is too large, the reactivity will increase in the test results and the strength will decrease after the reaction. The flow rate of carbon dioxide gas is too small, which leads to a decrease in the reactivity of the test results and an increase in strength after the reaction.

3) Related to voltage, the voltage during the normal coke reactivity test is 220V, and the fluctuation range is not allowed to exceed plus or minus 5%, otherwise it will also affect the test results.

hongxing2888 question. It's misleading, it has nothing to do with voltage at all, and if it has anything to do with voltage, it's a flaw in the device technology itself (I can explain it to you in depth if you need it).

I don't know what the landlord said about the test, is it for reactive equipment or process indicators? Or are you just a water army, this kind of question is just the level of the water army's questions.