A method for calculating the burn-off rate in a dry quenching process

Abstract

The application provides a method for calculating the burn loss rate in the dry quenching process, comprising the following steps: 1) calculating the oxygen element mass in the air entering the dry quenching furnace according to the air introduction amount; 2) calculating the amount of substance of the diffused flue gas according to the diffused flue gas flow of the pre-storage chamber in the dry quenching furnace; 3) calculating the carbon element mass and the oxygen element mass in the diffused flue gas according to the composition of the diffused flue gas; 4) comparing the oxygen element mass in the introduced air with the oxygen element mass in the diffused flue gas, correcting the carbon element mass in the diffused flue gas, and obtaining the corrected carbon element mass of the burn loss; 5) the burn loss rate = corrected carbon element mass of the burn loss ÷ (the coke mass discharged from the dry quenching furnace + the corrected carbon element mass of the burn loss) × 100%; thereby the real-time burn loss rate of the dry quenching process can be accurately and quickly calculated, the burn loss condition of the dry quenching process can be quickly calculated, the dry quenching operation can be real-time guided, the burn loss rate can be reduced, and the burn loss rate calculation is accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dry quenching, in particular to a method for calculating the burn loss rate in the dry quenching process. BACKGROUND

[0002] Dry quenching is a method for cooling red coke by using inert gas. In the dry quenching process, red coke at 1000℃ is loaded from the top of the dry quenching furnace, and low-temperature inert circulating gas at 130℃ is blown into the red coke layer in the cooling section of the dry quenching furnace by the circulating fan to absorb the sensible heat of the red coke. The cooled coke (below 200℃) is discharged from the bottom of the dry quenching furnace. The high-temperature inert gas flowing out of the annular flue of the dry quenching furnace passes through the waste heat boiler for heat exchange, and the waste heat boiler generates steam. The cooled inert gas is blown into the dry quenching furnace by the circulating fan again, and the inert gas is circulated in the closed system.

[0003] In recent years, in order to verify the burn loss rate, volatile matter calculation method, single hole production verification method and elevator weight measurement method are used, but the results measured are fluctuating, not real-time, and occasionally there are obvious illogical situations, which cannot guide production operation. SUMMARY

[0004] The purpose of the present application is to provide a method for calculating the burn loss rate in the dry quenching process.

[0005] To solve the above technical problems, the technical solution provided by the present application is:

[0006] A method for calculating the burn loss rate in the dry quenching process, comprising the following steps in sequence:

[0007] 1) Calculate the mass of oxygen elements in the air entering the dry quenching furnace by the air introduction amount;

[0008] The amount of substance of air / mol = air introduction amount m³ / h per hour x 24h x 1000 ÷ [(273 + ambient temperature ℃) ÷ 273 x 22.4 L / mol];

[0009] Wherein, the amount of substance of oxygen / mol = the amount of substance of air x 21%;

[0010] Oxygen element mass / ton = amount of substance of oxygen mol x 32g / mol ÷ 1000000;

[0011] 2) Calculate the amount of substance of the diffused flue gas by the diffused flue gas flow in the pre-storage chamber in the dry quenching furnace;

[0012] Diffused flue gas amount / m³ = diffused flue gas flow m³ / h x 24h;

[0013] Amount of substance of the flue gas released / mol = flue gas released m³ × 1000 ÷ [(273 + flue gas released temperature ℃) ÷ 273 × 22.4 L / mol];

[0014] 3) Calculate the mass of carbon element and the mass of oxygen element in the flue gas released according to the composition of the flue gas released;

[0015] Mass of carbon element / ton = amount of substance of the flue gas released mol × (volume percentage of CO in the flue gas released + volume percentage of CO2 in the flue gas released) × 12 g / mol ÷ 1000000;

[0016] Mass of oxygen element / ton = amount of substance of the flue gas released mol × (volume percentage of CO in the flue gas released + 2 × volume percentage of CO2 in the flue gas released) × 16 g / mol ÷ 1000000;

[0017] 4) Compare the mass of oxygen element in the introduced air with the mass of oxygen element in the flue gas released, and correct the mass of carbon element in the flue gas released:

[0018] When the mass of oxygen element in the introduced air in step 1) is greater than the mass of oxygen element in the flue gas released in step 3), the corrected mass of carbon element burned = mass of carbon element ÷ mass of oxygen element in the flue gas released × mass of oxygen element in the introduced air;

[0019] When the mass of oxygen element in the introduced air in step 1) is less than the mass of oxygen element in the flue gas released in step 3), the corrected mass of carbon element burned = mass of carbon element ÷ mass of oxygen element in the introduced air × mass of oxygen element in the flue gas released;

[0020] 5) Calculate the coke burning loss rate in the dry quenching process: burning loss rate = corrected mass of carbon element burned ÷ (dry quenching furnace discharged coke mass + corrected mass of carbon element burned) × 100%.

[0021] The present application has the following beneficial technical effects:

[0022] By the composition of the introduced air and the released circulating flue gas, the balance relationship of carbon element and oxygen element is calculated respectively, the mass of carbon element in the flue gas released is calculated, the real-time burning loss rate of dry quenching is accurately and quickly calculated, the burning loss of dry quenching can be quickly calculated, the dry quenching operation can be guided in real time, the burning loss rate is reduced, and the burning loss rate calculation is accurate. DETAILED DESCRIPTION

[0023] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0024] The present application provides a method for calculating the burn loss rate in the dry quenching process, comprising the following steps in sequence:

[0025] 1) Calculate the oxygen element mass in the air entering the dry quenching furnace according to the air introduction amount;

[0026] The amount of substance of air / mol = air introduction amount m³ / h per hour × 24h × 1000 ÷ [(273 + ambient temperature ℃) ÷ 273 × 22.4 L / mol];

[0027] The amount of substance of oxygen / mol = the amount of substance of air × 21%;

[0028] Oxygen element mass / ton = the amount of substance of oxygen mol × 32g / mol ÷ 1000000;

[0029] 2) Calculate the amount of substance of the diffused flue gas according to the diffused flue gas flow in the pre-storage chamber in the dry quenching furnace;

[0030] Diffused flue gas amount / m³ = diffused flue gas flow m³ / h × 24h;

[0031] The amount of substance of diffused flue gas / mol = diffused flue gas amount m³ × 1000 ÷ [(273 + diffused flue gas temperature ℃) ÷ 273 × 22.4 L / mol];

[0032] 3) Calculate the carbon element mass and oxygen element mass in the diffused flue gas according to the composition of the diffused flue gas;

[0033] Carbon element mass / ton = the amount of substance of diffused flue gas mol × (CO volume percentage in diffused flue gas + CO2 volume percentage in diffused flue gas) × 12g / mol ÷ 1000000;

[0034] Oxygen element mass / ton = the amount of substance of diffused flue gas mol × (CO volume percentage in diffused flue gas + 2 × CO2 volume percentage in diffused flue gas) × 16g / mol ÷ 1000000;

[0035] 4) Compare the oxygen element mass in the introduced air with the oxygen element mass in the diffused flue gas, and correct the carbon element mass in the diffused flue gas:

[0036] When the oxygen element mass introduced in the air in step 1) is greater than the oxygen element mass in the diffused flue gas in step 3), the corrected carbon element mass burned = carbon element mass ÷ oxygen element mass in the diffused flue gas × oxygen element mass introduced in the air;

[0037] When the oxygen element mass introduced in the air in step 1) is less than the oxygen element mass in the diffused flue gas in step 3), the corrected carbon element mass burned = carbon element mass ÷ oxygen element mass introduced in the air × oxygen element mass in the diffused flue gas;

[0038] 5) Calculate the coke burn-off rate in the dry quenching process: burn-off rate = corrected carbon element mass burned ÷ (dry quenching furnace discharged coke mass + corrected carbon element mass burned) × 100%.

[0039] In the present application, 22.4 refers to the gas standard molar volume constant, which refers to the volume occupied by a unit of gas, the unit is L / mol, and under standard conditions, 1 mole of any ideal gas occupies a volume of about 22.4 liters.

[0040] In the present application, 273 is the Kelvin temperature, which is the temperature calculated from absolute zero as the starting point, that is, the temperature obtained after accurately defining the temperature of the water triple point as 273.16 K (the water triple point temperature expressed in Celsius is 0.01°C), which was called absolute temperature in the past.

[0041] In the present application, in the dry quenching process, by introducing air (boiler inlet temperature is 600-970°C) and introducing nitrogen into the circulating flue gas (boiler inlet temperature is below 600°C or above 970°C), the composition content of the circulating flue gas is timely controlled to meet the process requirements, that is, CO < 6%, H2 < 3%, O2 < 1%, CO2 ≤ 15%, N2 > 75%.

[0042] The working principle of the method for calculating the burn-off rate in the dry quenching process provided by the present application is as follows:

[0043] According to the ideal gas state equation, the mass of oxygen elements in the air inhaled into the dry quenching system is calculated, and according to the corresponding relationship of the composition of the circulating flue gas, the mass of carbon elements consumed by this part of oxygen elements is calculated; at the same time, according to the diffused amount of the circulating flue gas, the mass of carbon elements contained in the diffused flue gas is calculated, and the two results are compared and analyzed, and the larger value is taken as the correction coefficient, and the calculation result is the carbon element content contained in the coke burned, so as to calculate the burn-off rate.

[0044] The methods and devices not described in detail in the present application are all prior art and will not be described again.

[0045] For further understanding of the present application, a method for calculating the burn loss rate in dry quenching coke process provided by the present application is described in detail below in combination with examples, and the protection scope of the present application is not limited by the following examples.

[0046] Example 1

[0047] The composition of the dry quenching coke emission gas is known: the volume percentage of CO is 5%, the volume percentage of CO2 is 20%, and the volume percentage of O2 is 0%; the emission gas flow is 10000 m³ / h, the temperature of the emission gas is 137℃, the ambient temperature is 27℃, the air introduction amount is 8000 m³ / h, and the daily production of dry coke is 2000 tons (the mass of coke discharged from the dry quenching coke oven), and the burn loss rate is to be calculated.

[0048] 1) Calculate the oxygen element mass in the air entering the dry quenching coke oven according to the air introduction amount;

[0049] The amount of substance of air = 8000 m³ / h × 24h × 1000 ÷ [(273K + 27℃) ÷ 273K × 22.4L / mol] = 7.8 × 10 6 mol;

[0050] The amount of substance of oxygen = 7.8 × 10 6 mol × 21% (volume percentage) = 1.638 × 10 6 mol;

[0051] The oxygen element mass = 1.638 × 10 6 mol × 32g / mol ÷ 1000000 = 52.42 tons;

[0052] 2) Calculate the amount of substance of the emission gas according to the emission gas flow of the pre-storage chamber in the dry quenching coke oven;

[0053] The amount of substance of the emission gas = 10000 m³ / h × 24h × 1000 ÷ [(273 + 137℃) ÷ 273 × 22.4] = 7.13 × 10 6 mol;

[0054] 3) Calculate the carbon element mass and the oxygen element mass in the emission gas according to the composition of the emission gas;

[0055] The carbon element mass = 7.13 × 10 6 mol × (5% + 20%) × 12g / mol ÷ 1000000 = 21.39 tons;

[0056] The oxygen element mass = (7.13 × 10 6 mol × 5% × 16g / mol + 7.13 × 10 6= 21.39 tons; 4) Comparing the oxygen element mass in the introduced air with the oxygen element mass in the diffused flue gas, the carbon element mass in the diffused flue gas is corrected:

[0057] 4) Comparing the oxygen element mass in the introduced air with the oxygen element mass in the diffused flue gas, the carbon element mass in the diffused flue gas is corrected:

[0058] Since the oxygen element mass in the introduced air in step 1) is greater than the oxygen element mass in the diffused flue gas in step 3), the corrected carbon element mass of the burn-off = the carbon element mass ÷ the oxygen element mass in the diffused flue gas × the oxygen element mass in the introduced air;

[0059] The corrected carbon element mass of the burn-off = 21.39 ÷ 51.34 × 52.42 = 21.84 tons;

[0060] 5) Calculating the coke burn-off rate in the dry quenching process: burn-off rate = 21.84 tons ÷ (2000 tons + 21.84 tons) × 100% = 1.08%.

[0061] The above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be noted that for those skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A method of calculating the burn loss rate in a dry quenching process, characterized by, The method comprises the following steps in sequence: 1) Calculate the oxygen element mass in the air entering the dry quenching furnace according to the air introduction amount; The amount of substance of air mol = air introduction amount m³ / h × 24h × 1000 ÷ [(273 + ambient temperature ℃) ÷ 273 × 22.4 L / mol]; The amount of substance of oxygen mol = the amount of substance of air × 21%; The oxygen element mass tons = the amount of substance of oxygen mol × 32g / mol ÷ 1000000; 2) Calculate the amount of substance of the diffused flue gas according to the diffused flue gas flow of the pre-storage chamber in the dry quenching furnace; The diffused flue gas amount m³ = diffused flue gas flow m³ / h × 24h; The amount of substance of the diffused flue gas mol = diffused flue gas amount m³ × 1000 ÷ [(273 + diffused flue gas temperature ℃) ÷ 273 × 22.4 L / mol]; 3) Calculate the carbon element mass and the oxygen element mass in the diffused flue gas according to the composition of the diffused flue gas; The carbon element mass tons = the amount of substance of the diffused flue gas mol × (CO volume percentage in the diffused flue gas + CO2 volume percentage in the diffused flue gas) × 12g / mol ÷ 1000000; The oxygen element mass tons = the amount of substance of the diffused flue gas mol × (CO volume percentage in the diffused flue gas + 2 × CO2 volume percentage in the diffused flue gas) × 16g / mol ÷ 1000000; 4) Compare the oxygen element mass in the introduced air with the oxygen element mass in the diffused flue gas, and correct the carbon element mass in the diffused flue gas: When the oxygen element mass in the introduced air in step 1) is greater than the oxygen element mass in the diffused flue gas in step 3), the corrected carbon element mass burned = carbon element mass ÷ oxygen element mass in the diffused flue gas × oxygen element mass in the introduced air; When the oxygen element mass in the introduced air in step 1) is less than the oxygen element mass in the diffused flue gas in step 3), the corrected carbon element mass burned = carbon element mass ÷ oxygen element mass in the introduced air × oxygen element mass in the diffused flue gas; 5) Calculate the coke burn-off rate in the dry quenching process: burn-off rate = corrected carbon element mass burned ÷ (dry quenching furnace discharged coke mass + corrected carbon element mass burned) × 100%.