A coke oven flue gas sulfur dioxide leakage detection device and method

Abstract

A coke oven flue gas sulfur dioxide leakage detection device and method, belongs to the technical field of coke oven flue gas detection devices and methods, and is used to detect the coke oven flue gas sulfur dioxide leakage rate. The technical scheme is: connect a branch gas pipeline to the coke oven inlet gas pipeline, introduce the branch gas pipeline and air into the combustion furnace for combustion, and adjust the ratio of gas to air in the combustion furnace to be the same as the ratio of coke oven heating gas to air in real time through an electric regulating valve; through the online sulfur dioxide online detector installed at the combustion furnace flue gas outlet and the coke oven flue gas outlet, respectively measure the values ​​of sulfur dioxide in the combustion furnace flue gas and sulfur dioxide in the coke oven gas flue gas, and calculate the measured values ​​to obtain the coke oven leakage rate. The detection device of the present invention has a simple structure, is easy to use, and has accurate and reliable detection results. The detection method is scientific, simple and fast to operate, and can detect the coke oven sulfur dioxide leakage rate in real time, providing reliable data support for the adjustment of the coke oven flue gas desulfurization process and the coke oven leakage control.

Description

Technical Field

[0001] The invention relates to a coke oven smoke sulfur dioxide leakage detection device and method, belonging to the technical field of coke oven smoke detection devices and methods. Background Art

[0002] In the production of coke ovens, sulfur dioxide and nitrogen oxides contained in the flue gas after combustion become one of the difficulties in the treatment of coking pollutants. Since the existing technology can only detect hydrogen sulfide in coal gas but cannot detect sulfur combined in the form of organic matter, the sulfur dioxide after the combustion of coke oven gas cannot be characterized by the content of hydrogen sulfide in coal gas. During the operation of the coke oven, due to the pressure fluctuation of the gas collecting pipe and the temperature fluctuation of the furnace during the coke pushing operation, it is inevitable that there will be leakage. If the coke oven leakage is not timely controlled, it will affect the life of the coke oven and the quality of coke. At the same time, leakage will cause part of the sulfur dioxide generated after the combustion of coke to enter the flue gas, causing the sulfur dioxide at the inlet of the desulfurization and denitrification flue gas to exceed the standard, thereby causing the desulfurization and denitrification flue gas treatment to fail to meet the standard. At present, the judgment of coke oven leakage is mainly based on temperature measurement experience, which leads to defects such as inaccurate judgment and lag, and the problem of coke oven leakage cannot be discovered in time and effectively. Therefore, it is very necessary to improve the existing detection of sulfur dioxide leakage in coke oven flue gas. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a coke oven flue gas sulfur dioxide leakage detection device and method, which can detect the coke oven sulfur dioxide leakage rate in real time and provide data support for coke oven flue gas desulfurization process adjustment and coke oven leakage control.

[0004] The technical solution to solve the above technical problems is:

[0005] A coke oven flue gas sulfur dioxide leakage detection device comprises a branch gas pipeline, a branch gas electric regulating valve, a branch gas flow meter, a combustion furnace, a burner, a combustion furnace inlet air pipeline, a combustion furnace flue gas pipeline, a combustion furnace flue gas sulfur dioxide online detector, a combustion furnace inlet air electric regulating valve, and a combustion furnace inlet air flow meter. One end of the branch gas pipeline is connected to the coke oven inlet gas pipeline, and the other end of the branch gas pipeline is connected to the burner of the combustion furnace. The branch gas pipeline is installed with a branch gas electric regulating valve and a branch gas flow meter. The combustion furnace inlet air pipeline 7 is connected to the burner 6, and the burner 6 is installed at the inlet of the combustion furnace 10. The combustion furnace flue gas pipeline 11 is connected to the outlet of the combustion furnace 10. The combustion furnace inlet air electric regulating valve 8 and the combustion furnace inlet air flow meter 9 are installed on the combustion furnace inlet air pipeline 7. The combustion furnace flue gas online sulfur dioxide detector 12 is installed on the combustion furnace flue gas pipeline 11.

[0006] The above-mentioned coke oven flue gas sulfur dioxide leakage detection device has a coke oven inlet gas pipeline connected to the coke oven inlet, a coke oven flue gas pipeline connected to the coke oven outlet, a coke oven inlet gas flow meter 2 installed on the coke oven inlet gas pipeline, and a coke oven flue gas sulfur dioxide online detector 16 and a coke oven flue gas flow meter 17 installed on the coke oven flue gas pipeline respectively.

[0007] A detection method using the above-mentioned coke oven flue gas sulfur dioxide leakage detection device is carried out by the following steps:

[0008] In the first step, the coke oven gas flow value is recorded as F1 by the coke oven inlet gas flow meter 2 of the coke oven inlet gas pipeline, and the coke oven flue gas flow value is recorded as F2 by the coke oven flue gas flow meter of the coke oven flue gas pipeline, that is, the coke oven air flow value is F2-F1;

[0009] The second step is to introduce gas into the burner through the branch gas pipeline, introduce air into the combustion furnace through the combustion furnace inlet air pipeline, and the gas and air in the branch gas pipeline are burned in the combustion furnace;

[0010] Step 3: Record the branch gas flow rate as F3 through the branch gas flow meter of the branch gas pipeline, and record the burner air flow rate as F4 through the burner inlet air flow meter of the burner inlet air pipeline;

[0011] The fourth step is to adjust the branch gas electric regulating valve and the combustion furnace inlet air electric regulating valve so that the ratio of gas to air in the combustion furnace F3 / F4 is equal to the ratio of gas to air in the coke oven F1 / (F2-F1);

[0012] The fifth step is to record the detection data of the combustion furnace flue gas sulfur dioxide online detector and the coke oven flue gas sulfur dioxide online detector at this time. The detection value of the combustion furnace flue gas online sulfur dioxide detector 12 is η1, and the detection value of the coke oven flue gas sulfur dioxide online detector 16 is η2. The result of calculating (η2-η1) / η1 is the coke oven series leakage rate.

[0013] The beneficial effects of the present invention are:

[0014] The present invention adds a branch gas pipeline and a combustion furnace, and installs a branch gas flow meter, a branch gas electric regulating valve, a combustion furnace inlet air flow meter, and a combustion furnace inlet air electric regulating valve on the branch gas pipeline and the combustion furnace inlet air pipeline, respectively, and installs a combustion furnace flue gas sulfur dioxide online detector on the combustion furnace. By adjusting the branch gas electric regulating valve and the combustion furnace inlet air electric regulating valve, the ratio of gas to air in the combustion furnace is equal to the ratio of gas to air in the coke oven. Then, by comparing the detection values ​​of the combustion furnace flue gas online sulfur dioxide detector and the coke oven flue gas sulfur dioxide online detector, the coke oven leakage rate can be calculated.

[0015] The present invention is the first of its kind in the detection technology for sulfur dioxide leakage in coke oven flue gas. The detection device has a simple structure, is easy to use, and has accurate and reliable detection results. The detection method has a scientific principle, is simple, fast, timely and effective to operate, and can detect the sulfur dioxide leakage rate of the coke oven in real time, providing data support for the adjustment of the coke oven flue gas desulfurization process and the coke oven leakage control. It thoroughly solves the defects of inaccurate and delayed judgment caused by judging coke oven leakage based on temperature measurement experience in the prior art, and the problem of failure to timely and effectively detect coke oven leakage can be solved. The coke oven can be repaired according to the coke oven leakage rate to reduce the desulfurization, denitrification and desulfurization load. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic structural diagram of a coke oven flue gas sulfur dioxide leakage detection device.

[0017] The markings in the figure are as follows: coke oven inlet gas pipeline 1, coke oven inlet gas flow meter 2, branch gas pipeline 3, branch gas electric regulating valve 4, branch gas flow meter 5, burner 6, combustion furnace inlet air pipeline 7, combustion furnace inlet air electric regulating valve 8, combustion furnace inlet air flow meter 9, combustion furnace 10, combustion furnace flue gas pipeline 11, combustion furnace flue gas online sulfur dioxide detector 12, coke oven 13, coke oven flue gas pipeline 14, coke oven chimney 15, coke oven flue gas sulfur dioxide online detector 16, coke oven flue gas flow meter 17. DETAILED DESCRIPTION

[0018] The coke oven flue gas sulfur dioxide leakage detection device of the present invention comprises a branch gas pipeline 3, a branch gas electric regulating valve 4, a branch gas flow meter 5 and a combustion furnace 10, a burner 6, a combustion furnace inlet air pipeline 7, a combustion furnace inlet air electric regulating valve 8, a combustion furnace inlet air flow meter 9, a combustion furnace flue gas pipeline 11, and a combustion furnace flue gas online sulfur dioxide detector 12.

[0019] As shown in the figure, one end of the branch gas pipeline 3 is connected to the coke oven inlet gas pipeline 1, and the other end of the branch gas pipeline 3 is connected to the burner 6 of the combustion furnace 10. The branch gas pipeline 3 transports the gas to the burner 6 of the combustion furnace 10 for combustion. The diameter of the branch gas pipeline 3 is 20-80mm.

[0020] The figure shows that a branch gas electric regulating valve 4 and a branch gas flow meter 5 are installed on the branch gas pipeline 3. The branch gas electric regulating valve 4 can adjust the gas delivery flow of the branch gas pipeline 3, and the branch gas flow meter 5 can display the gas flow in the branch gas pipeline 3. The range of the branch gas flow meter 5 is 1000 m 3 / h, branch gas flow rate is 100-200 m 3 / h.

[0021] As shown in the figure, the furnace inlet air duct 7 is connected to the burner 6, the burner 6 is installed at the inlet of the furnace 10, and the furnace flue gas duct 11 is connected to the outlet of the furnace 10. The gas transported by the branch gas pipeline 3 and the air input by the furnace inlet air duct 7 are burned in the burner 6 and the furnace 10. The diameter of the furnace inlet air duct 7 is 50-200mm, and the volume of the furnace 10 is 100-200m 3 , the lining is refractory brick.

[0022] The figure shows that the combustion furnace inlet air electric regulating valve 8 and the combustion furnace inlet air flow meter 9 are installed on the combustion furnace inlet air duct 7 to adjust the air flow entering the combustion furnace 10. The combustion furnace flue gas online sulfur dioxide detector 12 is installed on the main combustion furnace flue gas duct 11 to detect the value of sulfur dioxide in the combustion furnace flue gas. The range of the combustion furnace inlet air flow meter 9 is 3000m 3 / h, the air flow rate of the combustion furnace is 500-1600 m 3 / h, the range of the online sulfur dioxide detector 12 of the combustion furnace flue gas is 300ppm.

[0023] The figure shows that the coke oven inlet gas pipeline 1 is connected to the coke oven inlet, the coke oven flue gas pipeline 14 is connected to the coke oven outlet, the coke oven inlet gas flow meter 2 is installed on the coke oven inlet gas pipeline 1, and the coke oven flue gas sulfur dioxide online detector 16 and the coke oven flue gas flow meter 17 are installed on the coke oven flue gas pipeline 14. The coke oven gas flow rate is 10000-40000 m 3 / h, the coke oven gas combustion air flow is 50000-320000 m 3 / h, the measurement range of the coke oven flue gas sulfur dioxide online detector 16 is 0-600ppm, and the measurement range of the coke oven flue gas flow meter 17 is 0-500000 m 3 / h.

[0024] The coke oven flue gas sulfur dioxide leakage detection method of the present invention is carried out by the following steps:

[0025] In the first step, the coke oven gas flow value is recorded as F1 through the coke oven inlet gas flow meter 2 of the coke oven inlet gas pipeline 1, and the coke oven flue gas flow value is recorded as F2 through the coke oven flue gas flow meter 17 of the coke oven flue gas pipeline 14, that is, the coke oven air flow value is F2-F1;

[0026] In the second step, gas is introduced into the burner 6 through the branch gas pipeline 3, and air is introduced into the combustion furnace 10 through the combustion furnace inlet air pipeline 7. The gas and air in the branch gas pipeline 3 are burned in the combustion furnace 10;

[0027] Step 3: Record the branch gas flow value as F3 through the branch gas flow meter 5 of the branch gas pipeline 3, and record the air flow value of the combustion furnace 10 as F4 through the combustion furnace inlet air flow meter 9 of the combustion furnace inlet air pipeline 7;

[0028] The fourth step is to adjust the branch gas electric regulating valve 4 and the combustion furnace inlet air electric regulating valve 8 so that the ratio of gas to air F3 / F4 in the combustion furnace 10 is equal to the ratio of gas to air F1 / (F2-F1) in the coke oven 13;

[0029] The fifth step is to record the detection data of the combustion furnace flue gas sulfur dioxide online detector 12 and the coke oven flue gas sulfur dioxide online detector 16 at this time. The detection value of the combustion furnace flue gas online sulfur dioxide detector 12 is η1, and the detection value of the coke oven flue gas sulfur dioxide online detector 16 is η2. The result of calculating (η2-η1) / η1 is the coke oven series leakage rate.

[0030] Embodiments of the present invention are as follows:

[0031] Example 1

[0032] The flow rate F1 of the coke oven inlet gas flow meter 2 of the coke oven inlet gas pipeline 1 is 16000m 3 / h, the flow rate F2 of the coke oven flue gas flow meter 17 of the coke oven flue gas duct 14 is 104000 m 3 / h, the flow rate F3 of the branch gas flow meter 5 of the branch gas pipeline 3 is 100 m 3 / h, the logical relationship of F1 / (F2-F1) is 1 / 5.5, which is fed back to the combustion furnace inlet air electric regulating valve 8 to adjust the flow rate F4 of the combustion furnace inlet air pipe 7 to 550m 3 / h, the detection value η1 of the combustion furnace flue gas online sulfur dioxide detector 12 is 123.15ppm, and the detection value η2 of the coke oven flue gas online sulfur dioxide detector 16 is 129.04ppm, then (η2-η1) / η1=0.0478 is the coke oven leakage rate.

[0033] Example 2

[0034] The flow rate F1 of the coke oven inlet gas flow meter 2 of the coke oven inlet gas pipeline 1 is 16500m 3 / h, the flow rate F2 of the coke oven flue gas flow meter 17 of the coke oven flue gas duct 14 is 107250 m 3 / h, the flow rate F3 of the branch gas flow meter 5 of the branch gas pipeline 3 is 110 m 3 / h, the logical relationship of F1 / (F2-F1) is 1 / 5.5, which is fed back to the combustion furnace inlet air electric regulating valve 8 to adjust the flow rate F4 of the combustion furnace inlet air pipe 7 to 605m 3 / h, the detection value η1 of the combustion furnace flue gas online sulfur dioxide detector 12 is 123.14ppm, and the detection value η2 of the coke oven flue gas online sulfur dioxide detector 16 is 129.01ppm, then (η2-η1) / η1=0.0477 is the coke oven leakage rate;

[0035] Example 3

[0036] The flow rate F1 of the coke oven inlet gas flow meter 2 of the coke oven inlet gas pipeline 1 is 16600m 3 / h, the flow rate F2 of the coke oven flue gas flow meter 17 of the coke oven flue gas duct 14 is 107900 m 3 / h, the flow rate F3 of the branch gas flow meter 5 of the branch gas pipeline 3 is 120 m 3 / h, the logical relationship of F1 / (F2-F1) is 1 / 5.5, which is fed back to the combustion furnace inlet air electric regulating valve 8 to adjust the flow rate F4 of the combustion furnace inlet air pipe 7 to 660m 3 / h, the detection value η1 of the combustion furnace flue gas online sulfur dioxide detector 12 is 123.58ppm, and the detection value η2 of the coke oven flue gas online sulfur dioxide detector 16 is 130.22ppm, then (η2-η1) / η1=0.0537 is the coke oven leakage rate.

[0037] Example 4

[0038] The flow rate F1 of the coke oven inlet gas flow meter 2 of the coke oven inlet gas pipeline 1 is 16700m 3 / h, the flow rate F2 of the coke oven flue gas flow meter 17 of the coke oven flue gas duct 14 is 108550 m 3 / h, the flow rate F3 of the branch gas flow meter 5 of the branch gas pipeline 3 is 130 m 3 / h, the logical relationship of F1 / (F2-F1) is 1 / 5.5, which is fed back to the combustion furnace inlet air electric regulating valve 8 to adjust the flow rate F4 of the combustion furnace inlet air pipe 7 to 715m 3 / h, the detection value η1 of the combustion furnace flue gas online sulfur dioxide detector 12 is 119.91ppm, and the detection value η2 of the coke oven flue gas online sulfur dioxide detector 16 is 127.63ppm, then (η2-η1) / η1=0.0644 is the coke oven string leakage rate.

[0039] Example 5

[0040] Coke oven inlet gas 1 Coke oven inlet gas flow meter 2 flow F1 is 16800m 3 / h, the flow rate F2 of the coke oven flue gas flow meter 17 of the coke oven flue gas duct 14 is 109200 m 3 / h, the flow rate F3 of the branch gas flow meter 5 of the branch gas pipeline 3 is 140 m3 / h, the logical relationship of F1 / (F2-F1) is 1 / 5.5, which is fed back to the combustion furnace inlet air electric regulating valve 8 to adjust the flow rate F4 of the combustion furnace inlet air pipe 7 to 770m 3 / h, the detection value η1 of the combustion furnace flue gas online sulfur dioxide detector 12 is 126.7ppm, and the detection value η2 of the coke oven flue gas online sulfur dioxide detector 16 is 133.89ppm, then (η2-η1) / η1=0.0567 is the coke oven string leakage rate.

Claims

1. A detection method using a coke oven flue gas sulfur dioxide leakage detection device, characterized in that: The coke oven flue gas sulfur dioxide leakage detection device comprises: a branch gas pipeline (3), a branch gas electric regulating valve (4), a branch gas flow meter (5), a combustion furnace (10), a burner (6), a combustion furnace inlet air pipeline (7), a combustion furnace flue gas pipeline (11), a combustion furnace flue gas sulfur dioxide online detector (12), a combustion furnace inlet air electric regulating valve (8), and a combustion furnace inlet air flow meter (9). One end of the branch gas pipeline (3) is connected to the coke oven inlet gas pipeline (1), and the other end of the branch gas pipeline (3) is connected to the combustion furnace (10). The burner (6) is connected to the combustion furnace (10), a branch gas electric regulating valve (4) and a branch gas flow meter (5) are installed on the branch gas pipeline (3), the combustion furnace inlet air pipeline (7) is connected to the burner (6), the burner (6) is installed at the inlet of the combustion furnace (10), the combustion furnace flue gas pipeline (11) is connected to the outlet of the combustion furnace (10), the combustion furnace inlet air electric regulating valve (8) and the combustion furnace inlet air flow meter (9) are installed on the combustion furnace inlet air pipeline (7), and the combustion furnace flue gas online sulfur dioxide detector (12) is installed on the combustion furnace flue gas pipeline (11); The coke oven inlet gas pipeline (1) is connected to the coke oven inlet, the coke oven flue gas pipeline (14) is connected to the coke oven outlet, a coke oven inlet gas flow meter (2) is installed on the coke oven inlet gas pipeline (1), and a coke oven flue gas sulfur dioxide online detector (16) and a coke oven flue gas flow meter (17) are installed on the coke oven flue gas pipeline (14); It proceeds in the following steps: In the first step, the coke oven gas flow value is recorded as F1 through the coke oven inlet gas flow meter (2) of the coke oven inlet gas pipeline (1), and the coke oven flue gas flow value is recorded as F2 through the coke oven flue gas flow meter (17) of the coke oven flue gas pipeline (14), that is, the coke oven air flow value is F2-F1; In the second step, coal gas is introduced into the burner (6) through the branch coal gas pipeline (3), and air is introduced into the combustion furnace (10) through the combustion furnace inlet air pipeline (7), and the coal gas and air in the branch coal gas pipeline (3) are burned in the combustion furnace (10); Step 3: The branch gas flow rate value is recorded as F3 through the branch gas flow meter (5) of the branch gas pipeline (3), and the air flow rate value of the combustion furnace (10) is recorded as F4 through the combustion furnace inlet air flow meter (9) of the combustion furnace inlet air pipeline (7); Step 4: Adjust the branch gas electric regulating valve (4) and the combustion furnace inlet air electric regulating valve (8) so that the ratio of gas to air F3 / F4 in the combustion furnace (10) is equal to the ratio of gas to air F1 / (F2-F1) in the coke oven (13); The fifth step is to record the detection data of the combustion furnace flue gas sulfur dioxide online detector (12) and the coke oven flue gas sulfur dioxide online detector (16) at this time. The detection value of the combustion furnace flue gas online sulfur dioxide detector (12) is η1, and the detection value of the coke oven flue gas sulfur dioxide online detector (16) is η2. The result of calculating (η2-η1) / η1 is the coke oven series leakage rate.

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