DCJC-8The gelatinous layer analyzer is designed to simulate industrial coking conditions, mainly measuring the thickness of the gelatinous layer (Y value), the final shrinkage of the coke block (X value), the type of volume curve, and the technical characteristics of coke. The TXJC-2 type gum layer analyzer produced by Hebi Dingcheng Thermal Analysis Instrument Co., Ltd. is designed and produced according to the technical requirements of GB/T471 "Method for Determining the Gum Layer Index of Bituminous Coal".

1、 Basic principles

DCJC-8The determination process of the gelatinous layer index is to place the coal sample in a coal cup, apply a constant pressure, and place the coal cup in a perforated refractory brick with certain specifications and technical requirements, heating it unilaterally from the bottom at a certain heating rate. At this point, the temperature transmitted to the coal cup increases from top to bottom, and the coal sample inside the cup forms a series of isothermal surfaces with decreasing temperatures from bottom to top. When heated to a certain temperature, the coal sample above * * * remains unchanged due to not reaching the softening temperature; The middle part becomes a gelatinous substance in the form of asphalt due to reaching the softening temperature - limb body; And the next part changes from a gelatinous body to a semi coke due to reaching the curing temperature. The amount and properties of glial cells determine the quality of coking.

This instrument uses a probe to manually measure the thickness y value of the gelatinous body, and uses it to represent the coking property of coal.

2、 Instrument structure

There are two types of colloid analyzer: one with equilibrium thallium and one without equilibrium thallium. Our company produces the TXJC-2 type unbalanced thallium colloid layer analyzer. The instrument consists of a main furnace body and a temperature control part.

1Main furnace body

(1)Coal cup. The coal cup is the core part of the gelatinous layer analyzer, and the internal part of the coal cup should be smooth without streaks or dents. The diameter of the coal cup should be checked every 50 uses.

Inspection method: Measure 1 point every 10mm along the height of the coal cup, for a total of 6 points. The difference between the average value of the measured results and the average diameter (59.5mm) should not exceed 0.5mm. The clearance between the bottom and body of the cup should not exceed 0.5mm. If the bottom of the cup is burned after long-term use, but the cup body can still be used, the bottom can be replaced to extend the service life of the coal cup. Coal cup and thermocouple

The material of the tube has strict requirements and cannot be replaced by other materials because the thermal conductivity varies depending on the material, which affects the measurement results. The asbestos layer on the pressure plate above the coal sample in the coal cup should be replaced in a timely manner after long-term use has been burned and broken.

(2)Probe. The glial layer probe consists of a specially designed steel needle and a copper chromium scale. The diameter of the steel needle is 1mm, with a blunt tip at the bottom and a position pointer on the needle. For coal cups that have already been filled with coal samples but have not yet been tested, use a probe to measure the bottom position of the paper tube, and the pointer should point to the zero point of the scale. The exposed length of the steel needle should be 118mm. Newly used probe steel needles are usually longer than this when they leave the factory, and users can adjust them according to their actual situation.

(3)heating furnace. The heating furnace consists of a lower brick stack, an upper brick stack, and silicon carbon rod heating elements. To ensure that the heating strength of the coal sample in the coal cup gradually decreases from bottom to top, forming a good isothermal surface, and ensuring a relatively flat layer of gelatinous layer, there are strict requirements for the material and processing of the upper and lower brick stacks, and to ensure that their measurement results are consistent with those obtained using standard furnace bricks. The heating element is composed of two silicon carbide rods with similar resistance values connected in series, and its specifications should comply with the requirements of GB/T479. In order to protect and extend the service life of the silicon carbide rod, a quartz tube can be used to cover the silicon carbide rod to prevent tar droplets from causing local temperature differences and breakage.

(4)Pressure components. The pressure on the cross-section of the coal sample in the coal cup of the gelatinous layer analyzer is transmitted through the pressure plate, lever, and weight transmission surface, with a pressure (p) of 9.8 N/cm2. The instrument has been calibrated before leaving the factory, and the front and rear bars and weights have been calibrated and numbered. During the test, the front and rear weights cannot be mixed, otherwise it will affect the test results.

(5)Recorder. The glial layer analyzer uses a recording drum or displacement sensor to record the volume curve. The recording drum is driven by a recording clock. At present, there are two driving forms for recording rotary clocks: one is driven by a micro motor (synchronous motor), which achieves a rotation speed of 1mm/min through a variable speed device, such as the TXJC-2 glue layer recording rotary drum clock produced by the factory; Another approach is to use mechanical principles and drive with clock springs.

2Temperature control section

TXJC-2The temperature control of the type glial layer analyzer is manually controlled or automatically controlled by a programmable controller.

The manual control cabinet has two voltage regulators and two power meters, which can respectively control the heating of the front and rear furnaces of the gel layer measuring instrument

Monitor the current and voltage of carbon rods, and monitor the temperature of the front and back furnaces.

TXJC-3The type of gel layer temperature controller controls the temperature rise by changing the conduction angle of the thyristor, and has the ability to automatically recover after a short-term power outage

Before power outage, temperature and voltage opening (conduction angle) are required to enable the instrument to enter a stable state as soon as possible. Single furnace (front and rear furnaces) or dual furnace tests can be controlled simultaneously or separately, including controlling the heating rate of the front and rear furnaces, displaying the inspection time and notification recording time of the front and rear furnaces, etc. The instrument also has fault self diagnosis and fault display functions.

3、 Main technical indicators

Power supply (220 ± 22), 50HZ

***High output power 4KW

***High output current 20A

Physical and chemical indicators of furnace bricks:

Al₂0₃content40%

Fire resistance 1670-1710 ℃

Visible porosity 19% -29%

Specification of silicon carbide rod:

Voltage 110V

Current 8-15A

Resistance 6-8 ohms

Use a section with a length of 50mm and a diameter of 8mm

Cold end length60mm, with a diameter of 16mm

The maximum temperature of the hot part is 1200-1400 ℃

Burning intensityCan be lowered at a distance of 15mm from the cold end

Control cabinet instruments and meters:

Voltage regulator output voltage 0-250V

Ammeter * * * Large range 0-30A

The thermometer displays a range of 0-800 ℃

The thermocouple is K-type, nickel chromium nickel aluminum armored thermocouple

Record the specifications of the drum

Line speed 1mm/min

accuracyDraw a length of (180 ± 1) mm every 180 minutes

External dimensions:

Main furnace body (length x width x height) 8000 * 400 * 600mm

Control cabinet (length x width x height) 720 * 280 * 140mm