Blast furnace pulverized coal injection pipeline structure

Abstract

The utility model belongs to a blast furnace pulverized coal injection pipeline structure in the technical field of blast furnaces. One end of a nitrogen supply pipeline (1) is connected with a nitrogen source (2), the other end of the nitrogen supply pipeline (2) is connected with a pulverized coal supply cavity (3), a supply pipeline adjusting valve (4) is arranged on the nitrogen supply pipeline (1), the nitrogen supply pipeline (2) between the supply pipeline adjusting valve (4) and the pulverized coal supply cavity (3) is communicated with one end of a gas supplementing pipeline (5), and the other end of the gas supplementing pipeline (5) is connected with a nitrogen tank (6). A supply pressure sensor (7) is arranged at the end, close to the pulverized coal supply cavity (3), of the nitrogen supply pipeline (2), and a gas supply pipeline adjusting valve (8) is arranged on the gas supply pipeline (5). According to the pulverized coal injection pipeline structure of the blast furnace, nitrogen pressure can be conveniently and reliably adjusted and controlled, the accuracy of pulverized coal injection is ensured, the stability of pulverized coal injection is improved, and the combustion rate of pulverized coal entering the blast furnace is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnaces, and more specifically, relates to a blast furnace pulverized coal injection pipeline structure. Background Art

[0002] When a blast furnace burns, it is necessary to supply nitrogen to inject pulverized coal to realize the supply of pulverized coal into the blast furnace and ensure the normal combustion of the blast furnace. In the prior art, the stability of coal injection is not optimized, and nitrogen is supplied only through a single nitrogen supply pipeline. When an abnormal situation occurs in the nitrogen supply pipeline, resulting in a low pressure in the nitrogen pipeline, the amount of pulverized coal injected into the blast furnace per unit time will decrease, causing a large fluctuation in the coal injection amount. The large fluctuation in pulverized coal affects the combustion effect.

[0003] In the prior art, there is a technology with the name of "A Method for Improving the Combustion Rate of Pulverized Coal by Mixing Blast Furnace Hearth Dust into Pulverized Coal for Injection", and the publication number is "CN105112583A". This technology discloses a method for improving the combustion rate of pulverized coal by mixing blast furnace hearth dust into pulverized coal for injection, including the following steps: Step (1): Collect blast furnace hearth dust and transport it to the pulverized coal preparation workshop for injection; Step (2): Add 1.0% - 4.0% of blast furnace hearth dust to the pulverized coal for injection, and transport it to the coal mill through a belt conveyor to make mixed pulverized coal, and the mixed pulverized coal is collected by a bag dust collector; Step (3): Use compressed air to transport the mixed pulverized coal through a pipeline to the blast furnace injection station, and then through an injection tank to the blast furnace distributor, so that the mixed pulverized coal is distributed to each coal injection gun, and finally injected into the blast furnace for combustion through the blast furnace tuyere. The present invention will reduce the amount of ore and coke required for smelting each ton of iron by mixing hearth dust into the pulverized coal for injection. Adding an appropriate amount of Fe2O3 to the pulverized coal helps to improve the combustion rate of the pulverized coal, and the improvement of the combustion rate will reduce the comprehensive fuel ratio of the blast furnace; the SiO2 in the hearth dust acts as an abrasive, which is beneficial to improving the pulverized coal output rate. However, this technology does not involve the technical problems and technical solutions of this application. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: aiming at the deficiencies of the prior art, to provide a blast furnace pulverized coal injection pipeline structure with a simple structure, which can conveniently and reliably adjust and control the nitrogen pressure, ensure more accurate injection of pulverized coal, improve the stability of pulverized coal injection, inject pulverized coal according to the set nitrogen supply amount, and improve the combustion rate of pulverized coal entering the blast furnace.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the utility model is:

[0006] The utility model relates to a blast furnace pulverized coal injection pipeline structure, which includes a nitrogen supply pipeline. One end of the nitrogen supply pipeline is connected to a nitrogen gas source, and the other end is connected to a pulverized coal supply chamber. A supply pipeline regulating valve is arranged on the nitrogen supply pipeline. One end of a supplementary air pipeline communicates with the nitrogen supply pipeline between the supply pipeline regulating valve and the pulverized coal supply chamber, and the other end of the supplementary air pipeline is connected to a nitrogen gas tank. A supply pressure sensor is arranged at one end of the nitrogen supply pipeline close to the pulverized coal supply chamber, and a supplementary air pipeline regulating valve is arranged on the supplementary air pipeline.

[0007] The supply pipeline regulating valve, the supplementary air pipeline regulating valve and the supply pressure sensor are respectively connected to a control component.

[0008] Both the supply pipeline regulating valve and the supplementary air pipeline regulating valve are solenoid valves. The control component is configured to be able to control the opening degree of the supply pipeline regulating valve to adjust and switch between 0% and 100%, and the control component is configured to be able to control the opening degree of the supplementary air pipeline regulating valve to adjust and switch between 0% and 100%.

[0009] The supply pressure sensor is configured to be able to provide real-time feedback to the control component of the real-time pressure data of the nitrogen supply pipeline.

[0010] The control component is configured to store the low-pressure standard data of the set pressure range and the high-pressure standard data of the set pressure range.

[0011] When the real-time pressure data of the nitrogen supply pipeline fed back by the supply pressure sensor to the control component is higher than the low-pressure standard data of the set pressure range and the control component controls the opening degree of the supply pipeline regulating valve to be less than 100%, the control component is configured to be able to control the supplementary air pipeline regulating valve to be completely closed.

[0012] When the real-time pressure data of the nitrogen supply pipeline fed back by the supply pressure sensor to the control component is lower than the low-pressure standard data of the set pressure range and the control component controls the opening degree of the supply pipeline regulating valve to be 100%, the control component is configured to be able to control the supplementary air pipeline regulating valve to open and increase the opening degree.

[0013] When the real-time pressure data of the nitrogen supply pipeline fed back by the supply pressure sensor to the control component is higher than the low-pressure standard data of the set pressure range and lower than the high-pressure standard data of the set pressure range, the control component is configured to be able to control the supplementary air pipeline regulating valve to reduce the opening degree.

[0014] Adopting the technical solution of the utility model, the working principle and beneficial effects are as follows:

[0015] The blast furnace pulverized coal injection pipeline structure described in the present utility model has one end of the nitrogen supply pipeline connected to a nitrogen gas source, which is used to continuously supply nitrogen. The other end of the nitrogen supply pipeline is connected to a pulverized coal supply chamber, which is used to supply pulverized coal. The pulverized coal needs to be injected in cooperation with a corresponding amount of nitrogen to enable the pulverized coal to enter the blast furnace for combustion. A supply pipeline regulating valve is provided on the nitrogen supply pipeline, and the supply pipeline regulating valve can adjust the opening degree to control the amount of nitrogen passing through the nitrogen supply pipeline, meeting the demand for the amount of nitrogen corresponding to different pulverized coal supply amounts. One end of a supplementary air pipeline is connected to the nitrogen supply pipeline between the supply pipeline regulating valve and the pulverized coal supply chamber, and the other end of the supplementary air pipeline is connected to a nitrogen gas tank, which is used to supply gas to the nitrogen supplementary air pipeline. The supplementary air pipeline is in a disconnected state under normal conditions and needs to be started only under special conditions to increase the nitrogen supply amount. A supplementary air pipeline regulating valve is provided on the supplementary air pipeline, and the supplementary air pipeline regulating valve can adjust the opening degree to control the amount of nitrogen passing through the supplementary air pipeline. A supply pressure sensor is provided at one end of the nitrogen supply pipeline close to the pulverized coal supply chamber. The supply pressure sensor monitors the real-time pressure data at the opening position where nitrogen enters the pulverized coal supply chamber in real time, so as to control the opening degree of the supply pipeline regulating valve according to the real-time pressure data, and control the on / off and opening degree of the supplementary air pipeline regulating valve. In this way, nitrogen supply is carried out through the cooperation of two pipelines, namely the nitrogen supply pipeline and the supplementary air pipeline. Pipeline regulating valves are respectively provided on the two pipelines to reliably monitor and adjust the nitrogen supply, so that the pressure monitored by the supply pressure sensor fluctuates as much as possible within the set range, reducing the number of times of the low-pressure standard data below the set pressure range or the high-pressure standard data above the set pressure range per unit time, improving the nitrogen supply stability, improving the accuracy of the nitrogen supply amount, meeting the requirements of pulverized coal injection, and improving the combustion rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following briefly describes the content expressed in each drawing of this specification and the marks in the drawings:

[0017] Figure 1 It is a schematic structural diagram of the blast furnace pulverized coal injection pipeline structure described in the present utility model;

[0018] The marks in the drawings are respectively: 1. Nitrogen supply pipeline; 2. Nitrogen gas source; 3. Pulverized coal supply chamber; 4. Supply pipeline regulating valve; 5. Supplementary air pipeline; 6. Nitrogen gas tank; 7. Supply pressure sensor; 8. Supplementary air pipeline regulating valve. SPECIFIC EMBODIMENTS

[0019] The following further details the specific embodiments of the present utility model, such as the shapes, structures, mutual positions and connection relationships of the components involved, the functions of each part and the working principles, etc., by describing the embodiments with reference to the drawings:

[0020] As shown in the attached Figure 1As shown in the figure, the utility model relates to a blast furnace pulverized coal injection pipeline structure, which includes a nitrogen supply pipeline 1. One end of the nitrogen supply pipeline 1 is connected to a nitrogen gas source 2, and the other end of the nitrogen supply pipeline 1 is connected to a pulverized coal supply chamber 3. A supply pipeline regulating valve 4 is arranged on the nitrogen supply pipeline 1. One end of a supplementary air pipeline 5 is communicated with the nitrogen supply pipeline 1 between the supply pipeline regulating valve 4 and the pulverized coal supply chamber 3, and the other end of the supplementary air pipeline 5 is connected to a nitrogen gas tank 6. A supply pressure sensor 7 is arranged at one end of the nitrogen supply pipeline 1 close to the pulverized coal supply chamber 3, and a supplementary air pipeline regulating valve 8 is arranged on the supplementary air pipeline 5. For the deficiencies in the prior art, the above structure proposes an improved technical solution. When setting up the structure, the nitrogen supply pipeline 1 is set. One end of the nitrogen supply pipeline 1 is connected to the nitrogen gas source 2, and the nitrogen gas source 2 is used to continuously supply nitrogen. The other end of the nitrogen supply pipeline 1 is connected to the pulverized coal supply chamber 3, and the pulverized coal supply chamber 3 is used to supply pulverized coal. The pulverized coal needs to be injected with a corresponding amount of nitrogen to realize the combustion of the pulverized coal entering the blast furnace. The supply pipeline regulating valve 4 is arranged on the nitrogen supply pipeline 1, and the supply pipeline regulating valve 4 can adjust the opening degree to control the amount of nitrogen passing through the nitrogen supply pipeline 1 to meet the demand for the amount of nitrogen for different pulverized coal supply amounts. One end of the supplementary air pipeline 5 is communicated with the nitrogen supply pipeline 1 between the supply pipeline regulating valve 4 and the pulverized coal supply chamber 3, and the other end of the supplementary air pipeline 5 is connected to the nitrogen gas tank 6. The nitrogen gas tank 6 is used to supply gas to the nitrogen supplementary air pipeline. The supplementary air pipeline 5 is in a disconnected state under normal conditions and needs to be started only under special conditions to increase the nitrogen supply amount. The supplementary air pipeline regulating valve 8 is arranged on the supplementary air pipeline 5, and the supplementary air pipeline regulating valve 8 can adjust the opening degree to control the amount of nitrogen passing through the supplementary air pipeline 5. The supply pressure sensor 7 is arranged at one end of the nitrogen supply pipeline 1 close to the pulverized coal supply chamber 3, and the supply pressure sensor 7 monitors the real-time pressure data at the opening position where nitrogen enters the pulverized coal supply chamber 3 in real time, so as to control the opening degree of the supply pipeline regulating valve 4 according to the real-time pressure data, and control the on-off and opening degree of the supplementary air pipeline regulating valve 8. In this way, through the cooperation of the two pipelines, the nitrogen supply pipeline 1 and the supplementary air pipeline 5, the nitrogen supply is carried out. Each of the two pipelines is provided with a pipeline regulating valve to reliably monitor and adjust the nitrogen supply, so that the pressure monitored by the supply pressure sensor 7 fluctuates as much as possible within the set range, reducing the number of times of the low-pressure standard data below the set pressure range or the high-pressure standard data above the set pressure range per unit time, improving the nitrogen supply stability, improving the accuracy of the nitrogen supply amount, meeting the pulverized coal injection requirements, and improving the combustion rate. The blast furnace pulverized coal injection pipeline structure described in the utility model has a simple structure, can conveniently and reliably realize the nitrogen pressure regulation and control, ensure the accuracy of the pulverized coal injection, improve the stability of the pulverized coal injection, inject the pulverized coal according to the set nitrogen supply amount, and improve the combustion rate of the pulverized coal entering the blast furnace.

[0021] The regulating valve 4 of the supply pipeline, the regulating valve 8 of the air supplement pipeline, and the supply pressure sensor 7 are respectively connected to the control component. In the above structure, the connection of the control component establishes a correlation among the regulating valve 4 of the supply pipeline, the regulating valve 8 of the air supplement pipeline, and the supply pressure sensor 7, and the opening degrees of the regulating valve 4 of the supply pipeline and the regulating valve 8 of the air supplement pipeline are adjusted according to the real-time data fed back by the supply pressure sensor 7 to meet the precise control of the nitrogen supplied to the pulverized coal supply chamber 3.

[0022] The regulating valve 4 of the supply pipeline and the regulating valve 8 of the air supplement pipeline are both solenoid valves. The control component is set to have a structure capable of controlling the opening degree of the regulating valve 4 of the supply pipeline to adjust and switch between 0% and 100%, and the control component is set to have a structure capable of controlling the opening degree of the regulating valve 8 of the air supplement pipeline to adjust and switch between 0% and 100%. In the above structure, the opening degrees of the regulating valve 4 of the supply pipeline and the regulating valve 8 of the air supplement pipeline are reliably and flexibly controlled through the control component.

[0023] The supply pressure sensor 7 is set to have a structure capable of feeding back the real-time pressure data of the nitrogen supply pipeline 1 to the control component in real time. The control component is set to have a structure storing the low-pressure standard data of the set pressure range and the high-pressure standard data of the set pressure range. In the above structure, the supply pressure sensor 7 feeds back the real-time pressure data of the nitrogen supply pipeline 1 to the control component in real time, so that the control component controls the adjustment of the regulating valve 4 of the supply pipeline and the regulating valve 8 of the air supplement pipeline according to the change of the pressure data, and realizes the pressure fluctuation within the set range.

[0024] The control component is set to have a structure storing the low-pressure standard data of the set pressure range and the high-pressure standard data of the set pressure range. In the above structure, the standard data is the monitoring range. When it is lower than the low standard data or higher than the high standard data, the control component will control the adjustment of the regulating valve 4 of the supply pipeline and the regulating valve 8 of the air supplement pipeline to realize automatic interference correction.

[0025] When the real-time pressure data of the nitrogen supply pipeline 1 fed back by the supply pressure sensor 7 to the control component is higher than the low-pressure standard data of the set pressure range and the control component controls the opening degree of the regulating valve 4 of the supply pipeline to be less than 100%, the control component is set to have a structure capable of controlling the regulating valve 8 of the air supplement pipeline to be completely closed. In the above structure, it indicates that supplying nitrogen alone through the nitrogen supply pipeline 1 has met the requirements, and at this time, there is no need to open the air supplement pipeline for secondary gas supply.

[0026] When the real-time pressure data of the nitrogen supply pipeline 1 fed back by the supply pressure sensor 7 to the control component is lower than the low-pressure standard data of the set pressure range and the control component controls the opening degree of the supply pipeline regulating valve 4 to be 100%, the control component is configured to be able to control the air supplement pipeline regulating valve 8 to open and increase the opening degree. The above structure indicates that supplying nitrogen only through the nitrogen supply pipeline 1 cannot meet the requirements, and it is necessary to open the air supplement pipeline for secondary gas supply.

[0027] When the real-time pressure data of the nitrogen supply pipeline 1 fed back by the supply pressure sensor 7 to the control component is higher than the low-pressure standard data of the set pressure range and lower than the high-pressure standard data of the set pressure range, the control component is configured to be able to control the air supplement pipeline regulating valve 8 to reduce the opening degree. The above structure adjusts the opening degree of the air supplement pipeline regulating valve 8 in real time according to the comparison of the real-time pressure data, the low-pressure standard data of the set pressure range, and the high-pressure standard data of the set pressure range to control the real-time pressure within the set pressure range. And when the real-time pressure data is within the set pressure standard range, it indicates that the supplied nitrogen quantity meets the requirements.

[0028] The blast furnace coal powder injection pipeline structure described in the utility model has a nitrogen supply pipeline 1 with one end connected to a nitrogen gas source 2, which is used to continuously provide nitrogen, and the other end of the nitrogen supply pipeline 1 is connected to a coal powder supply chamber 3, which is used to supply coal powder, and the coal powder needs to be sprayed with a corresponding amount of nitrogen to enable the coal powder to enter the blast furnace for combustion. A supply pipeline regulating valve 4 is provided on the nitrogen supply pipeline 1, and the supply pipeline regulating valve 4 can adjust the opening size to control and adjust the amount of nitrogen passing through the nitrogen supply pipeline 1 to meet the demand for the amount of nitrogen for different coal powder supply amounts. The nitrogen supply pipeline 1 between the supply pipeline regulating valve 4 and the coal powder supply chamber 3 is connected to one end of the air supply pipeline 5, and the other end of the air supply pipeline 5 is connected to the nitrogen gas tank 6. The nitrogen gas tank 6 is used to supply gas to the nitrogen air supply pipeline. The air supply pipeline 5 is in a disconnected state in a normal state, and needs to be started only in a special state to increase the nitrogen supply. The air supply pipeline regulating valve 8 is provided on the air supply pipeline 5. The air supply pipeline regulating valve 8 can adjust the opening size to control the amount of nitrogen passing through the air supply pipeline 5. A supply pressure sensor 7 is provided at one end of the nitrogen supply pipeline 1 close to the coal powder supply chamber 3. The supply pressure sensor 7 monitors the real-time pressure data of the opening position of the nitrogen entering the coal powder supply chamber 3 in real time, so as to control the opening size of the supply pipeline regulating valve 4 according to the real-time pressure data, and control the on-off and opening size of the air supply pipeline regulating valve 8. In this way, nitrogen is supplied through the cooperation of the nitrogen supply pipeline 1 and the air supply pipeline 5. The two pipelines are respectively provided with pipeline regulating valves to reliably monitor and adjust the supply of nitrogen, so that the pressure monitored by the supply pressure sensor 7 fluctuates within the set range as much as possible, reducing the number of times that the pressure is lower than the low-level pressure standard data of the set pressure range or higher than the high-level pressure standard data of the set pressure range per unit time, thereby improving the stability of nitrogen supply, improving the accuracy of nitrogen supply, meeting the requirements of coal powder injection, and improving the combustion rate.

[0029] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A blast furnace coal powder injection pipeline structure, characterized in that: The invention comprises a nitrogen supply pipeline (1), one end of the nitrogen supply pipeline (1) is connected to a nitrogen gas source (2), the other end of the nitrogen supply pipeline (1) is connected to a pulverized coal supply chamber (3), a supply pipeline regulating valve (4) is arranged on the nitrogen supply pipeline (1), one end of an air supply pipeline (5) is connected to the nitrogen supply pipeline (1) between the supply pipeline regulating valve (4) and the pulverized coal supply chamber (3), the other end of the air supply pipeline (5) is connected to a nitrogen gas tank (6), a supply pressure sensor (7) is arranged at one end of the nitrogen supply pipeline (1) close to the pulverized coal supply chamber (3), and an air supply pipeline regulating valve (8) is arranged on the air supply pipeline (5).

2. The blast furnace coal powder injection pipeline structure according to claim 1 is characterized in that: The supply pipeline regulating valve (4), the air supply pipeline regulating valve (8) and the supply pressure sensor (7) are respectively connected to the control components.

3. The blast furnace coal powder injection pipeline structure according to claim 2 is characterized in that: The supply pipeline regulating valve (4) and the air supply pipeline regulating valve (8) are both solenoid valves, and the control component is configured to be a structure capable of controlling the opening of the supply pipeline regulating valve (4) to be adjusted and switched between 0% and 100%, and the control component is configured to be a structure capable of controlling the opening of the air supply pipeline regulating valve (8) to be adjusted and switched between 0% and 100%.

4. The blast furnace coal powder injection pipeline structure according to claim 2 is characterized in that: The supply pressure sensor (7) is configured to be a structure capable of feeding back real-time pressure data of the nitrogen supply pipeline (1) to the control component in real time.

5. The blast furnace coal powder injection pipeline structure according to claim 2 is characterized in that: The control component is configured to store a structure having low-level pressure standard data of a set pressure range and high-level pressure standard data of a set pressure range.

6. The blast furnace coal powder injection pipeline structure according to claim 5 is characterized in that: When the real-time pressure data of the nitrogen supply pipeline (1) fed back by the supply pressure sensor (7) to the control component is higher than the low-pressure standard data of the set pressure range and the opening of the supply pipeline regulating valve (4) controlled by the control component is less than 100%, the control component is configured to be able to control the air supply pipeline regulating valve (8) to be completely closed.

7. The blast furnace coal powder injection pipeline structure according to claim 5 is characterized in that: When the real-time pressure data of the nitrogen supply pipeline (1) fed back by the supply pressure sensor (7) to the control component is lower than the low-pressure standard data of the set pressure range and the control component controls the opening of the supply pipeline regulating valve (4) to 100%, the control component is configured to control the air supply pipeline regulating valve (8) to open and increase the opening.

8. The blast furnace coal powder injection pipeline structure according to claim 5, characterized in that: When the real-time pressure data of the nitrogen supply pipeline (1) fed back by the supply pressure sensor (7) to the control component is higher than the low-level pressure standard data of the set pressure range and lower than the high-level pressure standard data of the set pressure range, the control component is configured to control the air supply pipeline regulating valve (8) to reduce its opening.

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