Coal injection quantity increasing device capable of increasing injection of fine powder

Abstract

The utility model relates to a coal injection quantity increasing device for realizing fine powder injection increase, which is characterized by comprising a distributor connected with a coal injection main pipe and used for distributing a mixture of fine coke powder and coal powder to each air inlet of a blast furnace; the pipeline system is connected with each outlet of the distributor and the corresponding blast furnace air inlet and comprises a plurality of conveying pipelines, the lengths of the conveying pipelines are equal, and the conveying pipelines are linearly arranged from the outlets of the distributor to the blast furnace air inlets; and the fine coke powder supply system is used for feeding a mixture of fine coke powder and coal powder into the distributor. In conclusion, through the combined application of multiple technical characteristics such as optimization of a pipeline system and introduction of a fine coke powder supply system, the multiple technical effects of increasing injection of fine powder, increasing coal injection quantity, reducing cost, increasing efficiency and the like are achieved. The technical effects jointly make positive contributions to energy conservation, emission reduction and sustainable development of the iron and steel smelting industry.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial furnace coal injection, and in particular relates to a coal injection quantity enhancement device for realizing fine powder increased injection. Background Art

[0002] Blast furnace coal injection technology is a key technology in the modern steelmaking process. It mainly achieves energy saving and consumption reduction and improves production efficiency by injecting pulverized coal into the blast furnace to replace part of the coke. However, in the actual production process, due to the influence of various factors such as market environment, raw material quality, equipment performance, etc., blast furnace coal injection technology faces many challenges.

[0003] In the traditional coal injection process, the distributor is usually installed at a fixed height, and the coal powder is sprayed into the blast furnace by means of equidistant output, that is, the pipeline paths from the distributor outlet to the nearest and farthest tuyere of the blast furnace are of equal length, so there is a spiral shrinking and increasing layout method from the distributor output end to the nearest tuyere pipeline; however, when the purchased coal powder is of poor quality or the equipment performance is limited, this traditional method often leads to a bottleneck in the coal injection volume and cannot meet the existing process requirements. In addition, simply increasing the nitrogen pressure to increase the coal injection volume also has risks, which may cause the equipment to exceed its rated pressure, thereby causing production safety hazards.

[0004] In recent years, with the intensification of market competition and the improvement of environmental protection requirements, steel companies have an increasingly urgent need to reduce costs and increase efficiency. Therefore, how to break through the bottleneck of coal injection and improve the utilization rate of pulverized coal while ensuring production safety has become an urgent problem to be solved in the steel industry. In this context, it is particularly important to develop a new type of coal injection process to adapt to changes in the market environment and the increase in production demand.

[0005] In view of the problems existing in the prior art, the utility model proposes a new blast furnace coal injection process, which realizes equal resistance and equal amount of coal powder output by lowering the height of the distributor platform, optimizing the design of the pipeline system, etc., which not only increases the coal injection amount but also reduces the production cost, providing strong support for the sustainable development of steel enterprises. Utility Model Content

[0006] In view of the problems existing in the prior art, the utility model provides an industrial blast furnace coal injection quantity increasing device which realizes fine powder injection increase by optimizing the pipeline system.

[0007] The utility model is implemented as follows: a device for increasing the amount of coal injection for increasing fine powder injection, characterized in that it includes: a distributor connected to the coal injection main pipe, used to distribute the mixture of fine coke powder and coal powder to each air inlet of the blast furnace; a pipeline system, connecting each outlet of the distributor and the corresponding blast furnace air inlet, including several conveying pipelines, each of which has an equal length and is linearly arranged from the outlet of the distributor to the blast furnace air inlet; a fine coke powder supply system, used to feed the mixture of fine coke powder and coal powder into the distributor.

[0008] Preferably, the fine coke powder supply system includes a pulverized ash bin, a mill and an injection tank, wherein the pulverized ash bin is provided with a discharge port connected to the mill, the discharge port of the mill is connected to the injection tank, the discharge port of the injection tank is connected to a nitrogen high-pressure delivery pipe, and the nitrogen high-pressure delivery pipe is connected to a coal injection main pipe.

[0009] Preferably, a flow control device is provided inside the distributor to ensure that the mixture of fine coke powder and coal powder can be evenly distributed to each air inlet of the blast furnace.

[0010] Preferably, a wear-resistant layer is sprayed inside the delivery pipeline of the pipeline system.

[0011] Preferably, the ash bin of the fine coke powder supply system is provided with a material level sensor for real-time monitoring of the stock of fine coke powder in the ash bin and realizing an automatic material replenishment function through a control system.

[0012] Preferably, a nitrogen pressure detection sensor is installed on the injection tank, and the nitrogen pressure detection sensor is connected to a high-pressure nitrogen delivery control system to control the nitrogen high-pressure delivery pipe to spray a mixture of fine coke powder and coal powder into the blast furnace at a constant pressure and speed.

[0013] Advantages and technical effects of the utility model: The utility model adopts the above technical solution and has the following advantages:

[0014] Increase the amount of coal injection: By optimizing the pipeline system and adopting a linear layout, the fluid resistance is effectively reduced and the uniformity of injection is ensured, thereby increasing the amount of coal injection in the blast furnace and breaking through the bottleneck of the traditional process.

[0015] Realize the recycling of fine coke powder: The utility model not only improves the injection efficiency of coal powder, but also innovatively introduces the recycling of fine coke powder. Fine coke powder and coal powder are sprayed into the blast furnace together, which not only solves the problem of recycling fine coke powder, but also improves the utilization rate of resources.

[0016] Cost reduction and efficiency improvement: By increasing the injection of fine coke powder, the utility model not only improves the energy efficiency of the blast furnace, but also reduces production costs, achieving the purpose of cost reduction and efficiency improvement, and has important economic value for steel companies.

[0017] Enhanced system safety: In the traditional method of increasing nitrogen pressure to increase coal injection volume, there is a risk of equipment pressure exceeding the rated pressure. The utility model avoids this potential safety hazard and enhances the safety of the system by optimizing the pipeline system.

[0018] Process flexibility and scalability: The optimization method of the utility model is not only applicable to the existing blast furnace coal injection system, but can also be flexibly adjusted and optimized according to specific needs, and has good scalability and adaptability.

[0019] In summary, the utility model achieves multiple advantages such as increased fine powder injection, increased coal injection volume, resource recycling and utilization, cost reduction and efficiency improvement through the optimization of the pipeline system, providing strong support for energy conservation, emission reduction and sustainable development in the steel smelting industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model.

[0021] Figure numerals: 1. distributor; 11. flow control device; 2. pipeline system; 21. conveying pipeline; 3. fine coke powder supply system; 31. ash silo; 32. mill; 33. injection tank; 34. nitrogen high-pressure delivery pipe; 4. coal injection main pipe; 5. blast furnace. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0023] The utility model provides a device for increasing the amount of coal injection for increasing fine powder injection, which effectively improves the amount of coal injection and the efficiency of coal injection in a blast furnace through a specific structural design and system combination. The specific implementation of the utility model will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] like Figure 1 As shown, the device mainly includes a distributor 1, a pipeline system 2 and a fine coke powder supply system 3.

[0025] The distributor 1 is one of the core components of the device. It is connected to the coal injection main pipe 4. Its main function is to evenly distribute the mixture of fine coke powder and coal powder to each air inlet of the blast furnace 5. The distributor 1 is specially provided with a flow control device 11 inside. The device can accurately adjust and control the flow of each outlet, so as to ensure that each air inlet of the blast furnace can obtain an equal amount of mixture and ensure the uniformity of coal injection.

[0026] The pipeline system 2 connects each outlet of the distributor 1 with the corresponding blast furnace air inlet. The system is composed of several delivery pipelines 21, each of which is of equal length and arranged linearly from the outlet of the distributor 1 to the blast furnace air inlet. The uniform bending resistance of the pipeline is used to achieve an equidistant, equal-volume, and equal-resistance injection process, so that the overall pipeline at the distributor output end is optimized, and the resistance reduction measures are taken to improve the working efficiency of the distributor. Such a design can minimize the resistance and pressure loss of the fluid in the pipeline, and ensure that the resistance and flow rate of each output port remain balanced during the injection process.

[0027] In order to enhance the wear resistance and service life of the pipeline, a wear-resistant layer 22 is sprayed inside the delivery pipeline 21 .

[0028] The fine coke powder supply system 3 is responsible for feeding the mixture of fine coke powder and coal powder into the distributor 1. The system includes a powder ash bin 31, a mill 32 and an injection tank 33 in detail. The powder ash bin 31 is provided with a discharge port, which is connected to the mill 32 through a pipeline, and is used to feed the stored fine coke powder into the mill 32 for grinding. The mill 32 adopts efficient grinding technology, which can refine the fine coke powder to the required particle size. The ground fine coke powder is connected to the injection tank 33 through the discharge port of the mill 32. The discharge port of the injection tank 33 is connected to a nitrogen high-pressure delivery pipe 34, which is further connected to the coal injection main pipe 4, so that the mixture of fine coke powder and coal powder is fed into the distributor 1.

[0029] In order to monitor the stock of fine coke powder in the ash bin 31 in real time, the ash bin 31 is specially provided with a material level sensor. The sensor can detect the stock of fine coke powder in the ash bin 31 in real time and realize the automatic material replenishment function through the control system to ensure the continuous supply of fine coke powder.

[0030] At the same time, a nitrogen pressure detection sensor is installed on the injection tank 33, and the sensor is connected to the high-pressure nitrogen delivery control system. This system can accurately control the nitrogen pressure and flow rate in the nitrogen high-pressure delivery pipe 34, thereby ensuring that the mixture of fine coke powder and coal powder can be injected into the blast furnace at a constant pressure and speed, further improving the accuracy and stability of coal injection.

[0031] The design method for increasing the amount of coal injection in an industrial blast furnace by optimizing the pipeline system to increase fine powder injection is as follows:

[0032] (1) Adjust the height of the distributor platform. From the existing height of 26 meters, lower it by 4-5 meters. By lowering the platform height, the angle between the pipeline system and the blast furnace air inlet can be adjusted to optimize the injection path.

[0033] (2) In the optimized pipeline system, a linear layout is adopted to ensure that the length of each conveying pipeline from the distributor to the blast furnace air inlet is equal, so as to reduce fluid resistance and ensure the uniformity of injection; that is, the traditional pipeline layout method abandons the proximal spiral layout and adopts a linear layout along the reverse extension of the blast furnace. During the layout process, if a corner is encountered, it is a large angle corner that does not affect the flow and resistance, thereby achieving equal distance, equal pressure, and equal resistance to achieve the purpose of equal amount of injection.

[0034] (3) Through the fine coke powder supply system, the fine coke powder is refined from the ash silo by the mill and then sent to the injection tank;

[0035] (4) Using a nitrogen high-pressure delivery pipe, the mixture of fine coke powder and coal powder in the injection tank is delivered to the coal injection main pipe;

[0036] (5) The fine coke powder and coal powder mixture is evenly distributed to each air inlet of the blast furnace through a distributor to achieve the addition and injection of fine coke powder.

[0037] 1. Adjust the height of the material distribution platform of the distributor

[0038] In the traditional coal injection process, the distributor is usually installed at a fixed height, which limits the injection efficiency and the amount of coal injection to a certain extent. The utility model effectively adjusts the angle between the pipeline system and the blast furnace air inlet by adjusting the height of the distribution platform of the distributor, specifically lowering the platform height by 4 to 5 meters. This improvement optimizes the injection path, so that the mixture of coal powder and fine coke powder can be injected into the blast furnace more smoothly, thereby improving the injection efficiency.

[0039] Technical effect: By lowering the height of the distributor platform, the angle between the pipeline system and the blast furnace air inlet is reduced, and the injection path is optimized, thereby improving the injection efficiency of coal powder and fine coke powder.

[0040] 2. The optimized pipeline system adopts linear layout

[0041] In the traditional coal injection process, the pipeline from the distributor to the blast furnace air inlet is usually arranged in an equal pitch output manner, which in some cases will increase the fluid resistance and cause uneven injection. The utility model adopts a linear arrangement in the optimized pipeline system to ensure that the length of each transmission pipeline from the distributor to the blast furnace air inlet is equal. This arrangement reduces the fluid resistance, ensures the uniformity of injection, and further increases the coal injection amount.

[0042] Technical effect: Through the linear arrangement, the fluid resistance is reduced, the uniformity of the injection is ensured, thereby improving the coal injection amount and the injection efficiency. The linear arrangement of the pipeline system ensures that the resistance and flow rate of each output port remain consistent during the injection process, thereby achieving an equal distance, equal amount, and equal resistance injection effect.

[0043] 3. Introduction of fine coke powder supply system

[0044] The utility model uses a fine coke powder supply system to feed fine coke powder from the ash bin to the injection tank after being refined by a mill. This improvement not only realizes the recycling of fine coke powder, but also mixes it with coal powder and injects it into the blast furnace together, thereby improving the utilization rate of resources.

[0045] Technical effect: By introducing the fine coke powder supply system, the recycling of fine coke powder and its mixed injection with coal powder are realized, which improves the utilization rate of resources and the energy efficiency of coal injection.

[0046] 4. Use nitrogen high pressure delivery pipe to deliver the mixture into coal injection main pipe

[0047] The utility model uses a nitrogen high-pressure delivery pipe to deliver the fine coke powder and coal powder mixture in the injection tank to the coal injection main pipe. This method ensures that the mixture can be sprayed into the blast furnace evenly and efficiently, further improving the coal injection amount and production efficiency. During the injection process, the pressure of the injection tank is set to 0.9MPa to ensure that the fine coke powder and coal powder mixture can be sprayed into the blast furnace evenly and efficiently.

[0048] Technical effect: The mixture is delivered to the coal injection main pipe through a nitrogen high-pressure delivery pipe, ensuring the uniformity and efficiency of the injection, thereby improving production efficiency and coal injection volume.

[0049] 5. Introduction of monitoring system

[0050] The utility model also includes a monitoring system for real-time monitoring and control of the mixture flow, pressure and temperature in the coal injection main pipe. The monitoring system mainly includes a flow sensor for detecting the flow, a pressure sensor for detecting the pressure, and a temperature sensor for detecting the temperature and displaying the temperature. The above sensors are connected to a nitrogen delivery controller, etc. This improvement ensures the stability and efficiency of the injection process and provides a strong guarantee for the normal operation of the blast furnace. This improvement ensures the stability and efficiency of the injection process and provides a strong guarantee for the normal operation of the blast furnace.

[0051] Technical effect: By introducing a monitoring system, the parameters in the coal injection main pipe are monitored and regulated in real time, ensuring the stability and efficiency of the injection process and improving the operating reliability of the blast furnace.

[0052] In summary, the utility model achieves multiple technical effects such as fine powder injection increase, coal injection volume increase, cost reduction and efficiency improvement through the combined application of multiple technical features such as pipeline system optimization and introduction of fine coke powder supply system. These technical effects have jointly made positive contributions to energy conservation, emission reduction and sustainable development of the steel smelting industry.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for increasing the amount of coal injection to achieve fine powder injection, characterized in that: include: A distributor, connected to the coal injection main pipe, for distributing the mixture of fine coke powder and coal powder to various air inlets of the blast furnace; A pipeline system connects each outlet of the distributor with the corresponding blast furnace air inlet, including several conveying pipelines, each of which is of equal length and is arranged linearly from the outlet of the distributor to the blast furnace air inlet; a fine coke powder supply system is used to feed a mixture of fine coke powder and coal powder into the distributor.

2. The device for increasing the amount of coal injection for increasing fine powder injection according to claim 1 is characterized in that: The fine coke powder supply system includes a pulverized ash bin, a mill and an injection tank, wherein the pulverized ash bin is provided with a discharge port connected to the mill, the discharge port of the mill is connected to the injection tank, the discharge port of the injection tank is connected to a nitrogen high-pressure delivery pipe, and the nitrogen high-pressure delivery pipe is connected to a coal injection main pipe.

3. The device for increasing the amount of coal injection to achieve increased fine powder injection according to claim 1, characterized in that: A flow control device is provided inside the distributor to ensure that the mixture of fine coke powder and coal powder can be evenly distributed to each air inlet of the blast furnace.

4. The device for increasing the amount of coal injection to increase fine powder injection according to claim 1 is characterized in that: A wear-resistant layer is sprayed inside the delivery pipeline of the pipeline system.

5. The device for increasing the amount of coal injection to increase fine powder injection according to claim 1 is characterized in that: The fine coke powder supply system has a powder ash bin provided with a material level sensor for real-time monitoring of the stock of fine coke powder in the powder ash bin and realizing an automatic material replenishment function through a control system.

6. The device for increasing the amount of coal injection to increase fine powder injection according to claim 2 is characterized in that: The injection tank is equipped with a nitrogen pressure detection sensor, which is connected to a high-pressure nitrogen delivery control system to control the nitrogen high-pressure delivery pipe to spray a mixture of fine coke powder and coal powder into the blast furnace at a constant pressure and speed.

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