Method for removing carbon deposition on inner wall of coal gas preheating pipe
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A gas preheating tube and a technology for a preheating tube are applied in the directions of cleaning methods and utensils, chemical instruments and methods, cleaning hollow objects, etc. The effect of high efficiency, short process and efficient removal
Inactive Publication Date: 2017-11-17
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is: it is difficult and time-consuming to remove the carbon deposit on the inner wall of the existing gas preheating pipe.
Method used
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Embodiment 1
[0052] Example 1 Using the method of the present invention to remove carbon deposits on the inner wall of the gas preheating pipe
[0053] To remove carbon deposits in the gas preheating pipeline, the specific operation steps are as follows:
[0054] A. With 45Nm 3 / h flow into the air, with 60Nm 3 The / h flow rate is fed with nitrogen, the temperature in the pipeline is controlled at 900°C, and the duration is 240min. After this step is completed, the pressure of the preheating tube is detected to be 13.4kpa;
[0055] B. With 60Nm 3 / h flow into the air, with 60Nm 3 The / h flow rate is fed with nitrogen, the temperature in the pipeline is controlled at 900°C, and the duration is 240min. After this step is completed, the pressure of the preheating tube is detected to be 4.3kpa;
[0056] C. With 75Nm 3 / h flow into the air, with 60Nm 3 Nitrogen gas was introduced at a flow rate of / h, and the temperature in the pipeline was controlled at 900°C for 180 minutes. After this ...
Embodiment 2-10
[0061] Example 2-10 Using the method of the present invention to remove carbon deposits on the inner wall of the gas preheating pipe
[0062] The operation steps of Example 2-10 are the same as those of Example 1, and the specific parameter settings are shown in Table 2-10.
[0063] Table 2 The parameter setting of embodiment 2 carbon deposition removal
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[0065] Table 3 The parameter setting of embodiment 3 carbon deposition removal
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[0067] Table 4 The parameter setting of embodiment 4 carbon deposition removal
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[0069] Table 5 The parameter setting of embodiment 5 carbon deposition removal
[0070]
[0071] Table 6 The parameter setting of embodiment 6 carbon deposition removal
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[0073] Table 7 The parameter setting of embodiment 7 carbon deposition removal
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[0075] Table 8 The parameter setting of embodiment 8 carbon deposition removal
[0076]
[0077] Table 9 The parameter setting of embodiment 9 carbo...
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Abstract
The invention belongs to the field of chemical engineering, and particularly relates to a method for removing carbon deposition on the inner wall of a coal gas preheating pipe. The method for removing the carbon deposition on the inner wall of the coal gas preheating pipe aims at the problem that it is difficult and time consumed is long to remove the carbon deposition on the inner wall of an existing coal gas preheating pipe. The method for removing the carbon deposition on the inner wall of the coal gas preheating pipe comprises the following steps of introducing gas a and gas b into the preheating pipe, controlling the reaction temperature to be 500-1000 DEG C, continuing till the ventilating resistance of the coal gas preheating pipe becomes smaller, firstly stopping introducing the gas a, and then stopping introducing the gas b; and the gas a is air, oxygen or ozone, and the gas b is inert gas. According to the method for removing the carbon deposition on the inner wall of the coal gas preheating pipe, the carbon deposition on the inner wall of the coal gas preheating pipe is removed by introducing the air, the oxygen or the ozone, the carbon deposition can be quickly removed, and the risk of local burning-out of the coal gas preheating pipe caused by local overheating occurred at the position where the carbon deposition is more cannot happen. The method for removing the carbon deposition on the inner wall of the coal gas preheating pipe is simple in operation, short in process and high in efficiency, can efficiently remove the carbon deposition on the inner wall of the coal gas preheating pipe, and has an important significance.
Description
technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for removing carbon deposits on the inner wall of a gas preheating pipe. Background technique [0002] In industrial production, in the reaction system of materials and coke oven gas, if the reaction temperature is relatively high, the coke oven gas is generally preheated by the gas preheating tube. Since coke oven gas contains methane and other unsaturated hydrocarbons, these components will be cracked in the high-temperature preheating tube to produce elemental carbon, which adheres to the inner wall of the preheating tube to form carbon deposits. Over time, the carbon deposits on the inner wall of the preheating pipe gradually become thicker, which not only increases the resistance of the pipe ventilation, but also affects the heat transfer performance of the preheating pipe, greatly reducing the preheating efficiency of the entire preheating coil. Carbon...
Claims
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