KDHR-6 Automatic Ash Melting Point Tester

Product Introduction

The ash melting point measuring instrument of Hebi Keda Instrument Co., Ltd. uses a microcomputer to automatically control the ash melting point measurement process. The ash cone image is directly displayed on the microcomputer, and the ash cone result image and corresponding temperature value can be automatically printed. During the experiment, the image and temperature are automatically stored in the hard disk memory. This instrument is widely used in industries such as power, coal, cement, metallurgy, etc.

KDHR-6 Automatic Ash Melting Point TesterMain features

The ash melting point tester is paired with a silicon carbon tube high-temperature furnace and is an intelligent instrument used in the laboratory to determine the ash melting point. This instrument strictly completes the ash melting point measurement automatically in accordance with relevant national standards.

1. The microcomputer automatically controls the temperature rise, and the temperature rise characteristics comply with the national standard GB219-96;

2. The gray cone image is displayed in the image acquisition area of the microcomputer monitor;

3. The system has the function of storing and calling test results;

4. You can choose to print the ash melting point image and temperature value;

5. Display the temperature rise time curve;

6. The system runs on Windows 98 and above operating systems.

Technical parameters:

Temperature measurement range: 0-1600 ℃, resolution 1 ℃, equipped with S-value thermocouple.

Time range: 0-999 minutes, resolution of 1 minute (less than 10 minutes is considered as ls).

Heating rate: Before 900 ℃, 15-20 ℃/min

After 900 ℃, 5 ± 1 ℃/min

Temperature measurement error: ± 3 ℃

Control current: ＜ 30A

Experimental atmosphere: oxidizing, weakly reducing

Number of samples: 1-7

Power supply voltage: AC220V ± 10% 50Hz

Power: ≤ 5KW

Dimensions (mm): Furnace body 700 × 320 × 560 Controller 320 × 350 × 160

Instrument weight: 40Kg

KDHR-6 Automatic Ash Melting Point TesterInstructions for Use:

1. High temperature zone measurement. After the instrument is installed, its high temperature zone should be measured to select the location for placing the sample.

2. The sample is placed on a gray cone pallet.

The grey cone pallet is placed in the groove of the corundum boat. Then place substances for controlling the atmosphere in the corundum boat, such as charcoal, smokeless coal, graphite, etc.

3. Control the atmosphere inside the furnace.

(1) Weak reducing atmosphere

There are two types of high-temperature furnace chambers in this instrument: airtight alumina tubes and gas permeable high alumina tubes (usually the instrument is equipped with gas permeable high alumina tubes). The methods for controlling the weak reducing atmosphere are as follows:

a、 Gas tight corundum tube: Place 5-6g of graphite (particle size ≤ 0.2mm, ash content ≤ 15%) or introduce a mixture of 50 ± 10% H2 and ± 10% CO2 into the furnace at a ventilation rate of ≥ 100ml/min.

b、 Gas permeable high alumina tube: Place 15-20g of graphite (particle size ≤ 0.2mm, ash content ≤ 15%) in the furnace, and 30-40g of anthracite (particle size ≤ 0.5mm, ash content ≤ 15%) on both sides of the graphite. The enclosed carbonaceous material can be charcoal, coke, petroleum coke, etc. in addition to graphite and anthracite. Their granularity, quantity, and placement location depend on specific circumstances.

(2) Oxidative atmosphere

Do not put any carbon containing substances in the furnace and allow air to circulate freely.

(3) Identification of furnace atmosphere

When using the method of sealing carbon containing substances to generate a weakly reducing atmosphere, one of the following methods should be used to determine the atmosphere inside the furnace.

a、 Standard cone method: Select easily melted coal ash containing 20~30% Fe2 О 3, and measure its melting temperature in strong reducing atmosphere (by passing * * H2 in the furnace or sealing a large amount of anthracite or charcoal), weak reducing atmosphere, and oxidizing atmosphere respectively (T2 or T3 in strong reducing and oxidizing atmosphere should be 100~300 ℃ higher than that in weak reducing atmosphere), and then use them as standards to identify the furnace atmosphere. If the difference between the measured values of T2 or T3 reduction and weak atmosphere does not exceed 50 ℃, it proves that the atmosphere in the furnace is weak reducing; Otherwise, the determination of whether the atmosphere is strongly reducing or oxidizing should be based on the difference between the measured values in strong reducing and oxidizing atmospheres, as well as the degree of oxidation of the enclosed carbon containing substances.

b、 Gas extraction analysis method: from the high-temperature zone of the furnace at a rate of 5-7ml/min.

At a speed of 1000~1300 ℃, the gas is extracted for ten thousandth analysis. A reducing gas (mainly CO, including H2, CH4) with a volume ratio of 10~70% (1:1 with CO2 at 1100 ℃) and an O2 content of 0.5% is considered a weak reducing atmosphere.

Daily maintenance and upkeep of ash melting tester

1. The sample should be sufficiently fine (below 0.1mm);

When making a gray cone, the tip of the gray cone should be kept intact;

When pasting the gray cone, the gray cone should be perpendicular to the gray cone support plate; The bonded ash cone must be dried before it can be put into the experiment;

4. Keep the quartz plate, lens and other optical components clean;

5. To ensure the accuracy of the results, manual judgment can be made based on the specific situation from the images saved in the database;

6. High temperature furnaces should not be kept at their maximum temperature for a long time;

7. Components such as silicon carbon tubes should be replaced regularly;

When the instrument cannot function properly due to abnormal circumstances, it should be dealt with before use.