Load coking method for reflecting coke mass at different heights of coke oven

Abstract

The invention discloses a load coking method for reflecting the mass of coke at different heights of a coke oven, which comprises the following steps: calculating the bulk density of blended coal in a carbonization chamber, taking the bulk density as the bulk density of the blended coal of a load test coke oven, and determining the coal loading height of a coal retort; calculating the pressure borne by the matched coal seam at different heights in the carbonization chamber; respectively applying pressure borne by the coal seams at different heights in the carbonization chamber to the coal seams at the tops of the multiple coal retorts so as to simulate the stress of the coal seams at different heights in the carbonization chamber; and after the mixed coal in all the coal retorts is subjected to coking, respectively carrying out performance test on the coke in the coal retorts, and further carrying out top loading to produce the overall performance index of the coke in the coke oven. Dynamically adjusting the bulk density of the mixed coal in the load test coke oven according to the change of the coaling condition of the top-loading production coke oven; according to the pressure borne by the coke at different heights of the top-loading production coke oven, the load pressure value is adjusted during the coking test, so that the quality of the coke at different heights of the top-loading production coke oven can be reflected more truly.

Description

Technical Field

[0001] The present invention belongs to the technical field of coking tests. More specifically, the present invention relates to a weight-bearing coking method for reflecting the coke quality at different heights of a coke oven. Background Art

[0002] During the coking process of blended coal in a top-charging production coke oven, the bulk density of the blended coal has an important impact on the coke quality, especially the mechanical strength (crushing strength M 40 , abrasion resistance strength M 10 ) and hot-state performance indicators (reactivity CRI, post-reaction strength CSR). With the increase in the bulk density of the blended coal, both the mechanical strength and hot-state performance of the coke are improved. Due to the increase in bulk density, the contact between coal particles becomes dense, the gaps become smaller, the amount of colloidal substances required for the mutual adhesion between coal particles relatively decreases, and the colloidal substances during the coking process are easily evenly distributed and infiltrated on the surfaces of coal particles with different properties. The interfacial bonding ability between coal particles is enhanced, so that the surface of coal particles can be fully bonded, resulting in an enhanced bonding ability; in the semi-coke formation stage, gas-phase products are not easily precipitated, the swelling pressure increases, and the contact area of deformed coal particles increases, resulting in a thicker pore wall of the formed semi-coke; in the semi-coke shrinkage stage, the shrinkage force of active components between adjacent carbon structures weakens, the coke cracks decrease, and finally the formed coke has a thicker pore wall and a lower porosity, and the coke strength index is improved. The bulk density of the blended coal in a stamping production coke oven is basically fixed, while the bulk density of the blended coal in a top-charging production coke oven is affected by the coal charging conditions during actual production, such as the moisture content in the furnace, particle size distribution, and fineness (proportion of particle size < 3 mm).

[0003] During coking, the weight-bearing test coke oven always gives a fixed pressure to the blended coal through a weight-bearing plate to simulate the actual coking situation. Compared with the traditional box-type test coke oven, the hot-state performance CSR of the produced coke is increased by more than ten percentage points. However, when coking enterprises use the weight-bearing test coke oven to evaluate the coking performance of the blended coal, the bulk density and weight-bearing pressure of the blended coal are set as fixed values, which cannot reflect the coke quality at different heights of the top-charging production coke oven. Summary of the Invention

[0004] The present invention provides a weight-bearing coking method for reflecting the coke quality at different heights of a coke oven, aiming to improve at least one of the above problems.

[0005] The present invention is implemented as follows. A weight-bearing coking method for reflecting the coke quality at different heights of a coke oven is as follows:

[0006] (1) Calculate the bulk density ρ of the blended coal in the carbonization chamber 生产 ;

[0007] (2) Use the bulk density ρ of the blended coal in the carbonization chamber 生产 as the bulk density ρ of the blended coal in the weight-bearing test coke oven试验 , thereby determining the coal charging height h of the coal charger in the oven for the load test 试验 ;

[0008] (3) Calculate the pressures borne by the blended coal layers at different heights in the carbonization chamber

[0009] (4) Apply the pressures borne by the coal layers at different heights in the carbonization chamber to the top coal layers of multiple coal chargers respectively to simulate the forces on the coal layers at different heights in the carbonization chamber;

[0010] (5) After coking the blended coal in all the coal chargers, conduct performance tests on the coke in the coal chargers respectively;

[0011] (6) Calculate the overall performance index of the coke in the top-charging production coke oven based on the performance indexes of the coke at different heights in the top-charging production coke oven.

[0012] Furthermore, the method for determining the coal charging height h of the coal charger in the oven for the load test is specifically as follows: 试验 is as follows:

[0013] Measure the actual moisture content M of the test wet-based blended coal, and determine the weight G of the wet-based blended coal loaded into the oven for the load test based on the dry-based blended coal loading G0 of the current oven for the load test t ; 煤 ;

[0014] Based on the weight G of the wet-based blended coal loaded into the oven for the load test 煤 determine the coal charging volume V of the coal charger in the oven for the load test 试验 , and the coal charging height h of the coal charger under the coal charging volume V 试验 试验 .

[0015] Furthermore, the cavity of the inner chamber of the coal charger is cylindrical, and the bottom is spherical segment-shaped. The calculation formula for the coal charging height h of the coal charger is specifically as follows: 试验 is as follows:

[0016]

[0017] Among them, G 生产 is the coal charging weight of a single-hole carbonization chamber of the top-charging production coke oven; L is the effective length of a single-hole carbonization chamber; W is the average width of a single-hole carbonization chamber; H is the actual coal charging height of a single-hole carbonization chamber, G 煤 is the weight of the wet-based blended coal added to the oven for the load test, R is the radius of the coal charger, and h 球缺 is the spherical segment height of the bottom of the coal charger.

[0018] Furthermore, take heights h0, h1, h2, …, h i ,, …, hn from the bottom to the top of the carbonization chamber, and the height h in the carbonization chamberi The pressure borne by the coal seam at As the pressure borne by the coal seam at the top of the coal charger in the i-th coke oven for the load test Calculate the weight of the counterweight disk required to be applied at the top of the i-th coal charger Weight of the counterweight disk The specific calculation formula is as follows:

[0019]

[0020] Among them, R 配重 Is the radius of the counterweight disk.

[0021] Furthermore, the height h in the carbonization chamber i The pressure borne by the coal seam at The specific calculation formula is as follows:

[0022]

[0023] Among them, G 生产 Is the coal charging weight of a single-hole carbonization chamber in the top-charging production coke oven, L is the effective length of a single-hole carbonization chamber, W is the average width of a single-hole carbonization chamber, H is the actual coal charging height of a single-hole carbonization chamber, and g is the acceleration due to gravity.

[0024] Furthermore, take the blended coal charged into the top-charging production coke oven, crush the blended coal, control the final fineness to be 80% - 85%, and then load it into the coke oven for the load test for coking.

[0025] Furthermore, the performance tests of the coke include: tests of mechanical strength and hot-state performance indicators. Among them, the mechanical strength includes the shatter strength M 40 , abrasion resistance strength M 10 , and the hot-state performance indicators include the reactivity CRI and the strength after reaction CSR.

[0026] Furthermore, the specific calculation formula for the performance indicators of the whole coke in the top-charging production coke oven is as follows:

[0027]

[0028] Among them, CSR 综合 , CRI 综合 , M 40综合 , M 10综合 Respectively represent the strength after reaction CSR, reactivity CRI, shatter strength M 40 , abrasion resistance strength M 10 ; CSR i-1 , CRI i-1 , M 40(i-1) , M 10(i-1)respectively represent the post-reaction strength CSR, reactivity CRI, shatter strength M i-1 of coke at height h 40 in the top-loading production coke oven, abrasion resistance strength M 10 ; CSR n , CRI n , M 40(n) , M 10(n) respectively represent the post-reaction strength CSR, reactivity CRI, shatter strength M n of coke at height h 40 in the top-loading production coke oven, abrasion resistance strength M 10 ; h0 reflects the bottom of the carbonization chamber of the top-loading production coke oven, CSR0, CRI0, M 40(0) , M 10(0) respectively represent the post-reaction strength CSR, reactivity CRI, shatter strength M 40 of coke at the bottom in the top-loading production coke oven, abrasion resistance strength M 10 .

[0029] Furthermore, the calculation formula for the weight G 煤 of the wet-base blended coal in the burden test coke oven is as follows:

[0030]

[0031] where M t is the measured moisture content of the wet-base blended coal, and G0 is the dry-base blended coal charge weight of the current burden test coke oven.

[0032] The present invention dynamically adjusts the height of the blended coal in the coal charger in the burden test coke oven according to the change of the coal charging conditions in the top-loading production coke oven, and then dynamically adjusts the bulk density of the blended coal in the burden test coke oven; according to the pressure borne by the coke at different heights in the top-loading production coke oven, the burden pressure value is adjusted during the coking test, which can more truly reflect the coke quality at different heights in the top-loading production coke oven; the comprehensive performance index reflecting the overall coke in the top-loading production coke oven can be determined, and the index is more objective, comprehensive and reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a flowchart of the burden coking method for reflecting the coke quality at different heights in the coke oven provided by the embodiment of the present invention;

[0034] Figure 2 is a schematic structural diagram of the coal charger with a bottom spherical segment type provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0035] The following further elaborates on the specific implementation manners of the present invention by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0036] Figure 1 The following is a flowchart of the weight-bearing coking method for reflecting the coke quality at different heights of the coke oven provided by the embodiment of the present invention. The method is as follows:

[0037] (1) Calculate the bulk density ρ of the blended coal according to the coal charging conditions of the top-loading production coke oven 生产 ;

[0038]

[0039] Among them, ρ 生产 is the bulk density of the blended coal of the top-loading production coke oven, t / m 3 ; G 生产 is the coal charging weight of a single-hole carbonization chamber of the top-loading production coke oven, t; L is the effective length of a single-hole carbonization chamber, mm; W is the average width of a single-hole carbonization chamber, mm; H is the actual coal charging height of a single-hole carbonization chamber, mm.

[0040] (2) Calculate the pressure P borne by the blended coal layer at different heights of the carbonization chamber of the top-loading production coke oven 生产 ;

[0041] The pressure P borne by the coal layer at different heights of the carbonization chamber 生产 comes from the weight of the blended coal above the corresponding height. Therefore, the weight of the blended coal above the coal layer at this height divided by the horizontal cross-sectional area of the single-hole carbonization chamber where it is located is the pressure borne by the blended coal layer at different heights of the corresponding carbonization chamber. The specific calculation formula is as follows:

[0042]

[0043] Among them, is the pressure borne by the coal layer corresponding to the height h (unit: mm) from the bottom of the carbonization chamber, and g is the acceleration of gravity;

[0044] (3) Measure the actual moisture content M of the test wet-based blended coal t , and determine the weight G of the wet-based blended coal loaded into the load test coke oven based on the dry-based blended coal loading weight G0 of the current load test coke oven 煤 ;

[0045]

[0046] In the embodiments of the present invention, the dry-base blended coal charge of the load test coke oven generally includes 40 kg, 80 kg or 100 kg, and the fineness (referring to the particle size less than 3 mm) of the wet-base blended coal charged into the load test coke oven is 80% - 85%. The blended coal charged into the top-charging production coke oven is used for the coking test of the load test coke oven, and the blended coal is crushed in two stages using a hammer crusher and a pair-roller crusher to control the final fineness to 80% - 85%.

[0047] (4) Take the bulk density ρ of the blended coal in the top-charging production coke oven 生产 as the bulk density ρ of the blended coal in the load test coke oven 试验 , and then determine the coal charging height h of the coal charger in the load test coke oven 试验 .

[0048] In the embodiments of the present invention, based on the weight G of the blended coal charged into the load test coke oven 煤 determine the coal charging volume of the coal charger in the load test coke oven, and then determine the coal charging height. The coal charging height is achieved through multiple ramming by the ramming mechanism. Among them, the calculation formula for the coal charging volume of the coal charger is as follows:

[0049]

[0050] Wherein, V 试验 is the coal charging volume of the coal charger when the bulk density ρ of the blended coal in the coal charger is rammed to the bulk density ρ 试验 , m 生产 ; ρ 3 is the bulk density of the blended coal in the coal charger, t / m 试验 ; 3

[0051] The cavity of the inner cavity of the coal charger in the load test coke oven is cylindrical. To ensure the service life, the bottom uses a spherical segment type. The coal charging height h 试验 of the spherical segment is the height h 球缺 and the height h 圆柱 of the cylinder added together. As shown in Figure 2 , among them, the cross-section of the cylinder is a circle with a radius of R, and the radius of the spherical segment is R. Since the spherical segment at the bottom of the coal charger is definitely filled with the blended coal, therefore, mainly based on formula (6), the coal charging height h 圆柱 of the cylindrical cavity is calculated

[0052]

[0053] V 圆柱 = V 试验 - V 球缺 = π×R 2 ×h 圆柱 (6)

[0054] ​Combining formula (4), formula (5) and formula (6), it can be known that the coal charging height h of the coal pot 试验 The calculation formula is as follows:

[0055]

[0056] Based on formula (7), it can be known that after determining the coal charging weight (wet-based blended coal) G of a single-hole carbonization chamber of a top-charging coke oven 生产 , the coal charging height H of a single-hole carbonization chamber of a top-charging coke oven is also determined accordingly. Input the coal charging weight G 生产 and the coal charging height H of a single-hole carbonization chamber. The effective length L and average width W of a single-hole carbonization chamber are fixed values. After selecting the furnace type of the load test coke oven, based on the moisture content M of the wet-based blended coal t determine the weight G of the blended coal charged into the load test coke oven 煤 , the radius R of the coal pot and the spherical segment height h 球缺 are also fixed values. Based on formula (7), the coal charging height h of the coal pot can be determined 试验 .

[0057] (5) Divide the wet-based blended coal used for the experiment into equal-mass shares m. The specific value of m is adjusted according to the total weight. Optional values of m are 4, 8, 10, etc. Charge the coal pot m times. After each coal charging, compact it through the compaction mechanism to control the final coal charging height of the coal pot to be h 试验 , so that the bulk density of the load test coke oven is the same as that of the top-charging coke oven during actual production.

[0058] (6) Apply the pressures borne by the coal seams at n different heights in the carbonization chamber of the top-charging coke oven to the coal seams at the top of the coal pots of n load test coke ovens respectively to simulate the forces on the coal seams at n different heights in the carbonization chamber of the top-charging coke oven;

[0059] Take heights h0, h1, h2,..., h i ,..., hn from the bottom to the top of the carbonization chamber. The pressure i borne by the coal seam at the i-th height h in the carbonization chamber of the top-charging coke oven is respectively used as the pressure borne by the coal seam at the top of the coal pot of the i-th load test coke oven to calculate the weight of the counterweight disk required to be applied at the top of the i-th coal pot

[0060] In the embodiment of the present invention, the calculation formula of the pressure of the coal seam at the top of the coal pot is as follows:

[0061]

[0062] The bulk density of the blended coal in the top-loading production coke oven is affected by the self-gravity of the blended coal. The blended coal in the top-loading production coke oven is relatively dense and has a large density. Since the density of the blended coal in the controlled load test coke oven is basically the same as the bulk density of the blended coal in the top-loading production coke oven, even if a certain pressure is applied to the blended coal in the load test coke oven subsequently, the influence of the applied pressure on the density of the blended coal in the load test coke oven is small and can be basically ignored.

[0063] In the present invention, pressurization is achieved by placing counterweight discs of different weights on the blended coal at the top of the coal charging pot or by adjusting the cylinder valve of the air compressor. The weight of the counterweight disc can be combined by counterweight units of different weights such as 2, 5, 10, 20, 50 kg, etc. The radius of the counterweight disc is slightly smaller than the radius R of the cavity of the coal charging pot. The pressure borne by the top coal seam of the load test coke oven The required weight of the counterweight disc is calculated based on the following formula:

[0064]

[0065] wherein, represents the weight of the counterweight disc that needs to be placed on the top of the coal charging pot for the coal seam at height h i of the simulated coking chamber to bear the pressure, kg; S 配重 is the bottom area of the counterweight disc, m 2 ; R 配重 is the radius of the counterweight disc, m.

[0066] (7) When heating the furnaces of n load test coke ovens to 800 °C, move the rammed blended coal coal charging pot into the furnace, continue to heat up to 1050 °C, and keep it at a constant temperature for a certain period of time. The total heating-up and constant-temperature time is controlled within 15 - 26 h to ensure that the temperature of the central thermocouple is above 950 °C when the coal charging pot is taken out of the furnace.

[0067] (8) After the constant temperature ends, take the coal charging pot out of the furnace, and cool it to a central temperature below 100 °C by natural air cooling or by passing nitrogen in the quenching chamber. According to GB / T 2006 "Determination Method for Mechanical Strength of Coke" and GB / T 4000 "Test Method for Reactivity and Reactivity After Strength of Coke", test the mechanical strength (crushing strength M 40 and abrasion resistance strength M 10 ) and hot state performance indexes (reactivity CRI, reactivity after strength CSR) of the coke in the coal charging pot respectively, so as to reflect the coke quality at the corresponding height of the top-loading production coke oven.

[0068] The change trend of the coke quality at different heights of the top-loading production coke oven under a certain coal charging condition can be obtained.

[0069] (9) Calculate the performance indicators reflecting the overall coke in the top-loading production coke oven based on the performance indicators of coke at different heights in the top-loading production coke oven. The specific calculation formula is as follows:

[0070]

[0071] Among them, CSR 综合 , CRI 综合 , M 40综合 , M 10综合 respectively represent the post-reaction strength CSR, reactivity CRI, shatter strength M 40 , and abrasion resistance strength M 10 of the overall coke in the top-loading production coke oven; CSR i-1 , CRI i-1 , M 40(i-1) , M 10(i-1) respectively represent the post-reaction strength CSR, reactivity CRI, shatter strength M i-1 of the coke at height h 40 in the top-loading production coke oven, and abrasion resistance strength M 10 ; CSR n , CRI n , M 40(n) , M 10(n) respectively represent the post-reaction strength CSR, reactivity CRI, shatter strength M n of the coke at height h 40 in the top-loading production coke oven, and abrasion resistance strength M 10 ; h0 is the bottom of the carbonization chamber reflecting the top-loading production coke oven, and CSR0, CRI0, M 40(0) , M 10(0) respectively represent the post-reaction strength CSR, reactivity CRI, shatter strength M 40 of the coke at the bottom in the top-loading production coke oven, and abrasion resistance strength M 10 .

[0072] The present invention dynamically adjusts the height of the blended coal in the coal charging pot in the loading test coke oven according to the change of the coal charging conditions in the top-loading production coke oven, and further dynamically adjusts the bulk density of the blended coal in the loading test coke oven; according to the pressure borne by the coke at different heights in the top-loading production coke oven, the loading pressure value is adjusted during the coking test, which can more truly reflect the coke quality at different heights in the top-loading production coke oven; the comprehensive performance indicators reflecting the overall coke in the top-loading production coke oven can be determined, and the indicators are more objective, comprehensive and reasonable.

[0073] The present invention has been described by way of example. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method of weight-bearing coking that reflects the quality of coke at different heights in a coke oven, characterized in that, The method is specifically as follows: (1) Calculate the bulk density of the blended coal in the carbonization chamber; (2) Take the bulk density of the blended coal in the carbonization chamber as the bulk density of the blended coal for the oven loading test, and determine the coal charging height of the coal charger in the oven loading test oven; (3) Calculate the pressure borne by the blended coal layers at different heights in the carbonization chamber; (4) Apply the pressures borne by the coal layers at different heights in the carbonization chamber to the top coal layers of multiple coal chargers respectively to simulate the forces on the coal layers at different heights in the carbonization chamber; (5) After coking the blended coal in all the coal chargers, conduct performance tests on the coke in the coal chargers respectively; (6) Calculate the overall performance index of the coke in the top charging production coke oven according to the performance indexes of the coke at different heights in the top charging production coke oven.

2. The coke-making method with loading reflecting the coke quality at different heights of the coke oven as claimed in claim 1, characterized in that, Coal charging height h of the coal charger in the oven for load test 试验 The determination method is as follows: Measure the actual moisture content M of the blend coal on wet basis for the determination test t , and determine the weight G of the blend coal on wet basis charged into the coke oven for the current load test based on the weight G0 of the blend coal on dry basis charged into the coke oven for the load test 煤 ; Based on the wet basis blended coal weight G of the coke oven for charging load test 煤 Determine the coal charging volume V of the coal charger in the coke oven for charging load test 试验 , and the coal charging height h of the coal charger under the coal charging volume V 试验 试验 .​ 3. The coke-making method by loading for reflecting the coke quality at different heights of a coke oven as described in claim 2, characterized in that, The inner cavity of the coal retort is cylindrical, the bottom is spherical, and the coal retort is loaded with coal at a height h 试验 The calculation formula is as follows: Among them, G 生产 is the coal charging weight of a single coking chamber of the top-loading production coke oven; L is the effective length of a single coking chamber; W is the average width of a single coking chamber; H is the actual coal charging height of a single coking chamber, G 煤 is the weight of the wet-based blended coal added to the coke oven for the load test, R is the radius of the coal charging hopper, h 球缺 is the height of the spherical segment at the bottom of the coal charging hopper.

4. The method of weight coke making for reflecting the coke quality at different heights of the coke oven according to claim 1, characterized in that, Take heights h0, h1, h2, …, h from the bottom to the top of the carbonization chamber i 、…、h n , and take the pressure i borne by the coal seam at the height h in the carbonization chamber as the pressure borne by the coal seam at the top of the coal pot in the i-th loading test coke oven Calculate the weight of the counterweight disc required to be applied at the top of the i-th coal pot The formula for calculating the weight of the counterweight disc is specifically as follows: Among them, R 配重 is the radius of the counterweight disc.

5. The coking method with loading for reflecting the coke quality at different heights of the coke oven as claimed in claim 4, wherein, Height h inside the carbonization chamber i Pressure borne by the coal seam The specific calculation formula is as follows: Among them, G 生产 is the coal charging weight of a single coking chamber of a top-loading production coke oven, L is the effective length of a single coking chamber, W is the average width of a single coking chamber, H is the actual coal charging height of a single coking chamber, and g is the acceleration due to gravity.

6. The coking method under load as claimed in claim 1 for reflecting the coke quality at different heights of the coke oven, characterized in that, Take the blended coal charged into the top charging production coke oven, crush the blended coal, control the final fineness to be 80% - 85%, and then charge it into the oven loading test oven for coking.

7. The method of weight coke-making for reflecting the coke quality at different heights of a coke oven as claimed in claim 1, characterized in that, The performance tests of coke include: tests of mechanical strength and hot-state performance indicators. The mechanical strength includes the shatter resistance strength M 40 and the abrasion resistance strength M 10 , and the hot-state performance indicators include the reactivity CRI and the post-reaction strength CSR.

8. The coking method with loading according to claim 7 for reflecting the coke quality at different heights of the coke oven, characterized in that The specific calculation formula for the overall performance index of the coke in the top charging production coke oven is as follows: Among them, CSR 综合 , CRI 综合 , M 40综合 , M 10综合 respectively represent the post-reaction strength CSR, reactivity CRI, shatter strength M 40 of the whole coke in the top-loading production coke oven, and abrasion resistance strength M 10 ; CSR i-1 , CRI i-1 , M 40(i-1) , M 10(i-1) respectively represent the post-reaction strength CSR, reactivity CRI, shatter strength M i-1 of the coke at height h 40 in the top-loading production coke oven, and abrasion resistance strength M 10 ; CSR n , CRI n , M 40(n) , M 10(n) respectively represent the post-reaction strength CSR, reactivity CRI, shatter strength M n of the coke at height h 40 in the top-loading production coke oven, and abrasion resistance strength M 10 ; h0 reflects the bottom of the carbonization chamber of the top-loading production coke oven, and CSR0, CRI0, M 40(0) , M 10(0) respectively represent the post-reaction strength CSR, reactivity CRI, shatter strength M 40 of the coke at the bottom in the top-loading production coke oven, and abrasion resistance strength M 10 .

9. The weight coking method for reflecting the coke quality at different heights of the coke oven according to claim 2, characterized in that The weight G of the coal blend on a wet basis in the coke oven for the load test 煤 The calculation formula is as follows: Among them, M t is the measured value of the moisture content of the wet-based blended coal, and G0 is the dry-based blended coal charge of the current coke oven under the load test.

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