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D2014 – Standard Test Method Technical Guide
📐 Test Overview and Significance
This test method, designated D2014/D2014M-20, provides a large-scale laboratory procedure for assessing the expansion or contraction behavior of coal or coal blends during carbonization. The method is particularly useful for evaluating coals intended for coke manufacturing under simulated commercial coking conditions. The values determined indicate how a given coal or coal blend will perform in terms of expansion or contraction when compared with other coals and processing conditions used in commercial-type coke ovens.
The test involves heating a measured coal charge from the bottom while applying a constant load to the top surface. The final coke thickness, measured via piston position, reflects the expansion or contraction characteristics critical for predicting coke oven performance.
⚙️ Apparatus and Test Conditions
The apparatus consists of a sole-heated oven assembly with a carbonization chamber designed for unidirectional heating. Key components include a silicon carbide sole tile, firebrick walls, and a piston system for applying a constant load. The following table outlines the essential dimensions of the oven chamber as specified in the standard.
| 🟦 Component | 📏 Dimension | 📐 Value (SI) | 📐 Value (Inch-Pound) |
|---|---|---|---|
| Chamber Width | Width | 280 mm | 11 in. |
| Chamber Length | Length | 610 mm | 24 in. |
| Chamber Depth | Depth | 280 mm | 11 in. |
| Sole Tile Thickness | Thickness | 40 mm | 1.5 in. |
| Sole Tile Width | Width | 305 mm | 12 in. |
| Sole Extension (Front/Back) | Extension | 75 mm | 3 in. |
| Side, Front, Back Wall Thickness | Thickness | 40 mm | 1.5 in. |
The test procedure charges the oven with a coal sample to a specified thickness, applies a controlled force, and uses a piston to track expansion or contraction. Key test parameters are summarized below.
| 🎯 Parameter | ⚡ Value (SI) | ⚡ Value (Inch-Pound) |
|---|---|---|
| Coal Charge Thickness | 102 mm | 4 in. |
| Applied Pressure on Piston | 15.17 kPa | 2.20 psi |
| Hole Diameter in Sole (for instrumentation) | 6.35 mm | 0.25 in. |
📊 Key Measured Properties
The primary property measured is the final thickness of the coke produced, determined from the final position of the piston after heating. This measurement directly indicates the expansion or contraction of the coal during carbonization. Results are interpreted in the context of commercial coke oven experience, helping to predict how a coal blend will behave under actual processing conditions. The test also provides data comparing the relative behavior of different coals or blends.
⚠️ Important Note: The values stated in either SI units or inch-pound units are to be regarded separately as standard. They are not exact equivalents; each system must be used independently. Combining values from both systems is non-conforming to the standard.
💡 Tip: For reliable results, follow standard practices for coal sampling (Practice D2234/D2234M) and moisture determination (Test Method D3302). Ensure the oven is calibrated and the piston system maintains a constant force of 15.17 kPa [2.20 psi] throughout the test.
❓ Frequently Asked Questions
🔍 What is the purpose of this test method?
This method evaluates the expansion or contraction of coal or coal blends during carbonization, providing essential data for predicting their performance in commercial coke manufacturing and oven operation.
💡 How is the force applied during the test?
A constant load is applied to the top surface of the coal charge via a piston, exerting a pressure of 15.17 kPa [2.20 psi] throughout the test duration.
⚡ What are the key dimensional requirements for the oven chamber?
The carbonization chamber must have a width of 280 mm [11 in.], length of 610 mm [24 in.], and depth of 280 mm [11 in.]. The sole tile is silicon carbide, approximately 40 mm [1.5 in.] thick and 305 mm [12 in.] wide, extending 75 mm [3 in.] beyond the chamber at the front and back.
📌 Why must units be used separately?
To ensure conformance with the standard, SI and inch-pound units must be used independently without combining, as they are not exact equivalents and each system provides valid but distinct measurements.