Coal powder injection equipment for blast furnace

Abstract

The utility model provides a kind of coal powder injection equipment for blast furnace, including the injection tank with spiral blade inside being provided, still including material volume bucket, lifting mechanism and grinding mechanism, material volume bucket is provided with mounting hole, discharge port, and discharge port, lifting mechanism includes the support being set in the top of material volume bucket, lifting drive arrangement being connected in support and the moving plate being connected in the bottom end of lifting drive arrangement, support is provided with the slide rail of vertical extension, moving plate and slide rail sliding fit, lifting drive arrangement is used to drive moving plate along slide rail moves;Grinding mechanism includes the rotating motor being connected on moving plate, and the grinding roller being set in the inside of material volume bucket, the top end of grinding roller is connected the output end of rotating motor by mounting hole;Lifting drive arrangement drives the grinding mechanism below to move up and down by moving plate, can make grinding roller to coal powder carry out different degree of grinding, control coal powder fineness, prevent the emergence of jam problem.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical equipment technology, and in particular to a pulverized coal injection device for blast furnaces. Background Technology

[0002] The pulverized coal injection system is a crucial link in the ironmaking process. As a measure to replace coke with coal, pulverized coal injection into the blast furnace provides heat and a reducing agent for the blast furnace smelting process, effectively saving energy costs and coke resources. In current pulverized coal injection systems, pulverized coal and gas are transported into the blast furnace to complete the combustion process. However, pulverized coal injection systems suffer from problems such as poor transport stability and even blockages due to large particles or lumps in the pulverized coal. Utility Model Content

[0003] The purpose of this invention is to provide a pulverized coal injection device for blast furnaces, which can grind pulverized coal and solve the above-mentioned technical problems in the prior art.

[0004] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a pulverized coal injection device for a blast furnace, including an injection tank, wherein the injection tank is internally provided with helical blades, and further comprising:

[0006] The material volume tank has an installation hole at the top and a discharge port at the bottom that communicates with the blowing tank. The material volume tank also has a discharge port.

[0007] The lifting mechanism includes a bracket disposed on the top of the material volume tank, a lifting drive device connected to the bracket, and a movable plate connected to the bottom end of the lifting drive device. The bracket is provided with a vertically extending slide rail, the movable plate is slidably engaged with the slide rail, and the lifting drive device is used to drive the movable plate to move along the slide rail.

[0008] The grinding mechanism includes a rotary motor connected to the movable plate and a grinding roller disposed inside the material volume tank. The top end of the grinding roller is connected to the output end of the rotary motor through the mounting hole.

[0009] In one embodiment of this utility model, the support includes a top plate and two side plates. The top plate is fixedly connected between the top ends of the two side plates, and the bottom ends of the two side plates are fixedly connected to the top of the material volume tank. The lifting drive device is fixedly connected to the top plate. The two side plates are respectively provided with slide rails, and the opposite ends of the moving plate are respectively provided with connecting blocks. The connecting blocks slide in cooperation with the slide rail on the corresponding side.

[0010] In one embodiment of the present invention, the grinding roller includes a connecting shaft connected to the rotary motor, and a roller body connected to the bottom end of the connecting shaft;

[0011] The lower part of the roller body is provided with a lower grinding surface, which is a conical surface that is wider at the top and narrower at the bottom. The lower part of the material volume tank is adapted to the shape of the lower grinding surface.

[0012] The upper part of the roller body is provided with an upper grinding surface, which is a conical surface that is narrow at the top and wide at the bottom. A gap is left between the upper grinding surface and the inner wall of the material volume barrel for material to enter.

[0013] In one embodiment of this utility model, the center line of the grinding roller is collinear with the axis of the output end of the rotary motor.

[0014] In one embodiment of this utility model, the discharge port and the spray tank are connected by a sealing pipe.

[0015] In one embodiment of this utility model, an air inlet pipe is provided at one end of the spray can and a spray section is provided at the other end.

[0016] In one embodiment of this utility model, an electric valve is provided on the air intake pipe.

[0017] In one embodiment of this utility model, a heating box is provided at the outer end of the spraying part, one end of the heating box is provided with a feed inlet for connecting the spraying part, and the other end is provided with a discharge pipe for connecting the blast furnace.

[0018] In one embodiment of this utility model, the interior of the heating box forms a heating chamber and a conical cavity that are connected. The heating chamber is connected to the spray section, and the conical cavity is connected to the discharge pipe. The conical cavity gradually contracts from the heating chamber toward the discharge pipe.

[0019] In one embodiment of the present invention, a flue gas heat exchanger and an inert gas channel are further included. The first channel of the flue gas heat exchanger is connected to the flue gas pipe of the blast furnace, and the second channel of the flue gas heat exchanger is connected between the inert gas channel and the heating chamber.

[0020] One beneficial effect of this utility model is that:

[0021] The pulverized coal injection equipment for blast furnaces provided by this utility model has a material volume tank connected to the injection tank. A lifting mechanism and a grinding mechanism are set on the material volume tank. The lifting mechanism includes a support, a lifting drive device connected to the support, and a moving plate connected to the bottom of the lifting drive device. The grinding mechanism includes a rotary motor connected to the moving plate and a grinding roller set inside the material volume tank. The lifting drive device drives the grinding mechanism below to move up and down through the moving plate, which enables the grinding roller to grind the pulverized coal to different degrees, control the fineness of the pulverized coal, and prevent clogging problems. The slide rail on the support can guide the moving plate to ensure stable operation of the grinding mechanism.

[0022] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0024] Figure 1 This is a schematic diagram of an embodiment of a pulverized coal injection device for a blast furnace provided by this utility model;

[0025] Figure 2 yes Figure 1 Enlarged view of section A;

[0026] Figure 3 This is a cross-sectional view of an embodiment of a pulverized coal injection device for a blast furnace provided by this utility model;

[0027] Figure 4 This is an exploded view of an embodiment of a pulverized coal injection device for a blast furnace provided by this utility model;

[0028] The reference numerals and their corresponding component names in the figure are as follows:

[0029] 100. Mounting base;

[0030] 101. Jet can; 1011. Spiral blade; 1012. Jet section;

[0031] 102. Intake pipe; 1021. Electric valve;

[0032] 103. Heating chamber; 1031. Discharge pipe; 1032. Conical cavity; 1033. Heating chamber; 1034. Feed inlet; 1035. Heating port;

[0033] 104. Flue gas heat exchanger; 1041. Inert gas passage; 1042. Insulated pipe;

[0034] 105. Blast furnace;

[0035] 106. Sealing tube;

[0036] 107. Material volume tank; 1070. Mounting hole; 1071. Discharge port; 1072. Bracket; 1073. Slide rail; 1074. Lifting drive device; 1075. Moving plate; 1076. Connecting block; 1077. Discharge port;

[0037] 108. Rotary electric motor;

[0038] 109. Grinding roller; 1091. Connecting shaft; 1092. Roller body; 1093. Lower grinding surface; 1094. Upper grinding surface. Detailed Implementation

[0039] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0040] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0041] In this article, terms such as "up," "down," "front," "back," "top," and "bottom" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0042] In this document, unless otherwise stated, "a plurality of" means two or more, and the terms "installed," "connected," and "joined" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art will understand the specific meaning of the above terms in this document based on the specific circumstances.

[0043] Wherever possible, the various aspects and features described and illustrated in this specification may be applied individually, and these individual aspects may serve as the subject matter of a divisional application.

[0044] like Figures 1 to 4 As shown, this utility model provides a pulverized coal injection device for a blast furnace, including an injection tank 101, a material volume tank 107, a lifting mechanism, and a grinding mechanism.

[0045] The bottom of the injection tank 101 can be supported by a mounting base 100. The injection tank 101 has internal spiral blades 1011. The material storage tank 107 has a mounting hole 1070 at the top and a discharge port 1077 at the bottom communicating with the injection tank 101. The material storage tank 107 also has a discharge port 1071. Pulverized coal is fed into the material storage tank 107 through the discharge port 1071 and enters the injection tank 101 through the discharge port 1077. The discharge port 1071 can be located on the top or side of the material storage tank 107.

[0046] The lifting mechanism is located above the material storage tank 107 and includes a bracket 1072 set on the top of the material storage tank 107, a lifting drive device 1074 connected to the bracket 1072, and a movable plate 1075 connected to the bottom of the lifting drive device 1074. The bracket 1072 is provided with a vertically extending slide rail 1073, and the movable plate 1075 slides in cooperation with the slide rail 1073. The lifting drive device 1074 is used to drive the movable plate 1075 to move along the slide rail 1073.

[0047] The grinding mechanism includes a rotary motor 108 connected to a movable plate 1075 and a grinding roller 109 disposed inside a material storage tank 107. The output end of the rotary motor 108 faces downward. The top end of the grinding roller 109 is connected to the output end of the rotary motor 108 through a mounting hole 1070 on the top of the material storage tank 107.

[0048] A rotary motor 108 drives the grinding roller 109 to rotate, grinding the coal powder in the material container 107 and breaking down larger particles to prevent clogging. A lifting drive device 1074 drives the grinding mechanism up and down via a moving plate 1075. The lifting drive device 1074 drives the grinding mechanism downwards, applying a load force to allow the grinding roller 109 to grind the coal powder to different degrees, controlling the fineness of the coal powder. Different degrees of grinding can be performed for coal powder of different qualities to avoid insufficient or excessive grinding. A slide rail 1073 on the support 1072 guides the moving plate 1075, ensuring stable up and down movement of the grinding mechanism.

[0049] The lifting drive device 1074 can be an electric push rod, a cylinder, or other drive device that provides linear motion driving force.

[0050] In some embodiments of this utility model, the support 1072 includes a top plate and two side plates. The top plate is fixedly connected between the top ends of the two side plates, and the bottom ends of the two side plates are fixedly connected to the top of the material volume tank 107. The top plate and the two side plates form a door-shaped structure.

[0051] like Figure 1 and Figure 2As shown, the lifting drive device 1074 is fixedly connected to the top plate of the bracket 1072. The two side plates of the bracket 1072 are respectively provided with slide rails 1073. The opposite ends of the moving plate 1075 are respectively provided with connecting blocks 1076, and the connecting blocks 1076 slide in cooperation with the slide rails 1073 on the corresponding side.

[0052] In some embodiments of this utility model, such as Figure 3 and Figure 4 As shown, the grinding roller 109 includes a connecting shaft 1091 connected to a rotary motor 108, and a roller body 1092 connected to the bottom end of the connecting shaft 1091. The lower part of the roller body 1092 is provided with a lower grinding surface 1093, which is a conical surface that is wider at the top and narrower at the bottom. The inner wall of the lower part of the material volume tank 107 is adapted to the shape of the lower grinding surface 1093, so as to fully grind the coal powder.

[0053] The upper part of the roller body 1092 is provided with an upper grinding surface 1094. The upper grinding surface 1094 is a conical surface that is narrow at the top and wide at the bottom. A gap is left between the upper grinding surface 1094 and the inner wall of the material volume tank 107 for the material to enter. The gap gradually narrows from top to bottom, guiding large coal powder particles into the space between the lower grinding surface 1093 and the lower inner wall of the material volume tank 107.

[0054] A bearing seat can be installed in the mounting hole 1070 at the top of the material volume tank 107. The connecting shaft 1091 is fitted in the bearing seat, which can support and guide the connecting shaft 1091, so that the grinding roller 109 can work stably.

[0055] Furthermore, the centerline of the grinding roller 109 is collinear with the axis of the output end of the rotary motor 108, and the rotary motor 108 drives the grinding roller 109 to rotate around its own centerline. The discharge port 1077 is located at the lowest point of the material volume tank 107.

[0056] The discharge port 1077 and the spray tank 101 are connected by a sealing pipe 106. The upper end of the sealing pipe 106 is connected to the discharge port 1077, and the lower end is connected to the spray tank 101. The spray tank 101 is arranged horizontally, and the lower end of the sealing pipe 106 is connected to the top of the spray tank 101.

[0057] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, one end of the spray can 101 is provided with an air inlet pipe 102, and the other end is provided with a spray section 1012. An electric valve 1021 is provided on the air inlet pipe 102 for controlling the opening and closing of the air inlet pipe 102.

[0058] The inlet pipe 102 is used to introduce an inert gas, such as nitrogen, into the injection tank 101. The inert gas blows the pulverized coal from the material volume tank 107 into the injection tank 101 to the injection section 1012. The spiral blades 1011 convey the pulverized coal from the inlet pipe 102 to the injection section 1012, improving the conveying efficiency. The inner wall of the injection section 1012 forms a structure that gradually narrows from the inside to the outside, enabling the pulverized coal and inert gas to be ejected.

[0059] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, a heating box 103 is provided at the outer end of the injection section 1012. One end of the heating box 103 is provided with a feed inlet 1034 connecting to the injection section 1012, and the other end is provided with a discharge pipe 1031 for connecting to the blast furnace 105. The heating box 103 is used to preheat the incoming pulverized coal, which is then conveyed to the blast furnace 105 through the discharge pipe 1031. It should be noted that... Figure 1 , Figure 3 and Figure 4 Only a portion of the structure of blast furnace 105 is shown in the image.

[0060] In some embodiments of this utility model, such as Figure 3 As shown, the interior of the heating chamber 103 forms a connected heating chamber 1033 and a conical cavity 1032. The heating chamber 1033 is connected to the injection section 1012 of the injection tank 101, and the conical cavity 1032 is connected to the discharge pipe 1031. The conical cavity 1032 gradually narrows from the heating chamber 1033 towards the discharge pipe 1031. The heating chamber 1033 is used to preheat the pulverized coal entering from the injection section 1012, and the conical cavity 1032 enables the preheated pulverized coal to quickly enter the discharge pipe 1031, thereby accelerating the conveying efficiency.

[0061] In some embodiments of this invention, the device further includes a flue gas heat exchanger 104 and an inert gas channel 1041. The flue gas heat exchanger 104 includes a first channel and a second channel for heat exchange. The first channel of the flue gas heat exchanger 104 is connected to the smoke pipe of the blast furnace 105, and the second channel of the flue gas heat exchanger 104 is connected between the inert gas channel 1041 and the heating chamber 1033 of the heating box 103.

[0062] Specifically, the flue gas heat exchanger 104 can be a plate heat exchanger. The first channel inlet of the flue gas heat exchanger 104 is connected to the flue gas pipe of the blast furnace 105, and the outlet can be connected to a chimney to discharge flue gas that meets emission standards, or it can be connected to flue gas treatment equipment for treatment. The second channel inlet of the flue gas heat exchanger 104 is connected to an inert gas channel 1041, and the outlet is connected to a heating chamber 1033. The heating chamber 1033 is equipped with a heating port 1035, which is connected to the outlet of the second channel of the flue gas heat exchanger 104 via an insulated pipe 1042. A valve can be installed in the heating port 1035 to control its opening and closing. A temperature sensor can be installed inside the heating chamber 103 to monitor the temperature in real time. If the detected temperature exceeds the safety standard, the flue gas heat exchanger 104 must be shut down to stop preheating.

[0063] The inert gas channel 1041 sends an inert gas, such as nitrogen, into the second channel of the flue gas heat exchanger 104. After being heated by the flue gas, the inert gas enters the heating port of the heating chamber 1033 to preheat the pulverized coal in the heating chamber 1033. It can also increase the airflow pressure in the heating chamber 1033, which is conducive to the pulverized coal entering the discharge pipe 1031 more quickly through the conical cavity 1032, improving the combustion efficiency and making full use of the flue gas heat energy of the blast furnace.

[0064] like Figure 3 In one specific embodiment shown, the heating port 1035 is located at the top of the heating chamber 1033 to make the length of the heat insulation pipe 1042 shorter and reduce heat loss.

[0065] In another specific embodiment, the heating port 1035 is located at the bottom of the heating chamber 1033. Inert gas enters the heating chamber 1033 from the bottom heating port 1035 upwards, which can reduce the settling of coal powder at the bottom of the heating chamber 1033, thereby reducing the cleaning frequency of the heating box 103. Of course, the heating port can also be located at other positions in the heating chamber 1033.

[0066] The pulverized coal injection equipment for blast furnaces provided by this utility model grinds the pulverized coal in the material volume tank 107 through a grinding mechanism, and controls the grinding fineness of the pulverized coal through a lifting mechanism, which is beneficial to the stability of pulverized coal transportation and effectively reduces clogging problems. The ground pulverized coal is sent into the injection tank 101, and the air inlet pipe 102 sends air to the injection tank 101, and the pulverized coal is injected into the heating chamber 1033 of the heating box 103 in conjunction with the spiral blades 1011. The flue gas heat exchanger 104 uses the heat of the flue gas of the blast furnace 105 to preheat the pulverized coal in the heating chamber 1033. After preheating, the pulverized coal enters the discharge pipe 1031 through the conical cavity 1032 of the heating box 103, and then enters the blast furnace 105, which improves the transmission efficiency and combustion efficiency of pulverized coal and makes full use of the thermal energy of the blast furnace.

[0067] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of the present invention is defined by the appended claims.

Claims

1. A pulverized coal injection apparatus for a blast furnace, comprising an injection tank, an inside of the injection tank being provided with spiral vanes, characterized in that, Also include: Material volume bucket, which is provided with mounting hole in the top, bottom is provided with discharge port with the said blowing tank communication, the said material volume bucket is also provided with discharge port; Lifting mechanism, including the support provided in the top of the material volume bucket, the lifting drive device connected to the support, and the moving plate connected in the bottom end of the lifting drive device, the support is provided with vertical extension slide rail, the moving plate and the slide rail sliding fit, the lifting drive device is used for driving the moving plate along the slide rail moves; Grinding mechanism, including the rotating motor connected on the moving plate, and the grinding roller provided in the inside of the material volume bucket, the top end of the grinding roller is connected with the output end of the rotating motor through the mounting hole.

2. The pulverized coal injection equipment for blast furnace according to claim 1, wherein, The support includes a top plate and two side plates, the top plate is fixedly connected between the top ends of the two side plates, the bottom ends of the two side plates are fixedly connected to the top of the material volume bucket, the lifting drive device is fixedly connected to the top plate, the slide rails are respectively arranged on the two side plates, the opposite ends of the moving plate are respectively provided with connecting blocks, and the connecting blocks are in sliding fit with the slide rails on the corresponding side.

3. The pulverized coal injection equipment for blast furnace according to claim 1, wherein, The grinding roller includes a connecting shaft connected with the rotating motor, and a roller body connected to the bottom end of the connecting shaft; The lower part of the roller body is provided with a lower grinding surface, the lower grinding surface is arranged as a conical surface with wide top and narrow bottom, and the lower part of the material volume bucket is matched with the shape of the lower grinding surface; The upper part of the roller body is provided with an upper grinding surface, the upper grinding surface is arranged as a conical surface with narrow top and wide bottom, and a gap for entering material is left between the upper grinding surface and the inner wall of the material volume bucket.

4. The pulverized coal injection equipment for blast furnace according to claim 1, wherein, The center line of the grinding roller is arranged in line with the axis of the output end of the rotating motor.

5. The pulverized coal injection equipment for blast furnace according to claim 1, wherein, The discharge port and the blowing tank are connected through a sealing pipe.

6. The pulverized coal injection equipment for blast furnace according to any one of claims 1 to 5, wherein, One end of the blowing tank is provided with an air inlet pipe, and the other end is provided with a jet part.

7. The pulverized coal injection equipment for blast furnace according to claim 6, wherein, An electric valve is arranged on the air inlet pipe.

8. The pulverized coal injection equipment for blast furnace according to claim 6, wherein, A heating box is arranged at the outer end of the jet part, one end of the heating box is provided with a feed inlet connected with the jet part, and the other end is provided with a discharge pipe connected with the blast furnace.

9. The pulverized coal injection equipment for blast furnace according to claim 8, wherein, The inside of the heating box forms a heating cavity and a conical cavity in communication, the heating cavity is connected with the jet part, the conical cavity is connected with the discharge pipe, and the conical cavity is gradually contracted from the heating cavity to the discharge pipe.

10. The pulverized coal injection apparatus for a blast furnace according to claim 9, characterized by further comprising a flue gas heat exchanger and an inert gas passage, a first passage of the flue gas heat exchanger connecting a flue of the blast furnace, and a second passage of the flue gas heat exchanger connecting between the inert gas passage and the heating chamber.

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