Device for blowing large amount of prepared CDQ powder in blast furnace and use method of device

Abstract

The invention provides a device for injecting a large amount of CDQ powder for a blast furnace and a using method of the device. The device comprises a CDQ powder bin, a screw feeder, an electronic belt scale and a coal feeding main belt. CDQ powder is contained in the CDQ powder bin, a receiving opening is formed in the top of the CDQ powder bin, and a discharging opening is formed in the bottom of the CDQ powder bin; a material receiving pipeline is installed at the material receiving opening, the other end of the material receiving pipeline is used for being connected to a material receiving tank car used for conveying CDQ powder, and a vacuum pump is installed on the material receiving pipeline; the discharging port is connected to a feeding port of the screw feeder through a discharging pipeline, and the feeding port of the screw feeder is located above the electronic belt scale; the electronic belt scale is consistent with the belt running direction of the coaling main belt, and the electronic belt scale is positioned above the coaling main belt. According to the technical scheme, the problem that in the prior art, injection of CDQ powder can cause a large amount of abrasion to pulverized coal grinding equipment and injection pipelines is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of iron-making process, in particular, especially relates to a device for blast furnace injection of a large amount of CDQ powder and a use method thereof. BACKGROUND

[0002] The CDQ powder is the dry quenching flue dust suspended matter collected by the bag filter of the dry quenching flue dust collector in the coking dry quenching device, is the waste produced under the requirements of environmental protection and energy saving production in the coking industry, and is used for blast furnace iron-making injection, sintering batching and power plant in most enterprises. However, the utilization rate of CDQ powder is low in the sintering batching process, and the use of CDQ powder in the power plant wastes high-priced resources, so most of the CDQ powder is used for blast furnace injection. Compared with the injection of pulverized coal, the CDQ powder has a smaller particle size, and a large amount of dust is generated in the transportation, storage and batching process. In addition, the CDQ powder has a large hardness and a large number of edges, which can cause a large amount of wear on the pulverized coal grinding equipment and the injection pipeline during pipeline transportation. SUMMARY

[0003] According to the above-mentioned technical problems that the injection of CDQ powder can cause a large amount of wear on the pulverized coal grinding equipment and the injection pipeline, a device for blast furnace injection of a large amount of CDQ powder and a use method thereof are provided.

[0004] The technical means adopted by the present application are as follows: A device for blast furnace injection of a large amount of CDQ powder, comprising a CDQ powder bin, a screw feeder, an electronic belt scale and a coal feeding main belt. The CDQ powder bin is internally provided with CDQ powder, and is provided with a receiving port at the top and a discharge port at the bottom. The receiving port is provided with a receiving pipeline, one end of the receiving pipeline is connected to a tank truck for conveying CDQ powder, and the other end of the receiving pipeline is provided with a vacuum pump. The discharge port is connected to the feeding port of the screw feeder through a discharge pipeline, the feeding port of the screw feeder is located above the electronic belt scale, and the screw feeder is used for conveying the CDQ powder in the CDQ powder bin to the electronic belt scale. The electronic belt scale is consistent with the running direction of the belt of the coal feeding main belt, the electronic belt scale is located above the coal feeding main belt, and the electronic belt scale is used for monitoring the amount of conveyed CDQ powder. The front section of the electronic belt scale overlaps with the horizontal projection of the rear section of the coal feeding main belt.

[0005] Further, the vacuum pump is used for sucking the CDQ powder in the tank truck into the CDQ powder bin through negative pressure, the receiving pipeline is further connected to a nitrogen tank through a branch pipeline, and the nitrogen tank is used for providing nitrogen as the carrier gas for conveying CDQ powder when the CDQ powder is conveyed by the vacuum pump.

[0006] Further, the dust removal device is installed on the material receiving port, the material receiving pipeline is connected to the feeding port of the dust removal device, and the dust removal device is used to prevent dust from being generated when the CDQ powder is delivered to the CDQ powder bin.

[0007] Further, the end of the discharging pipeline close to the discharging port is provided with an inspection plug valve.

[0008] Further, the water spraying device is arranged above the electronic belt scale, and the water spraying device is used to spray water on the electronic belt scale to suppress dust when the electronic belt scale delivers the CDQ powder.

[0009] Further, the CDQ bin is internally provided with a material level monitor used to monitor the internal CDQ powder material level in real time, and the material level monitor adopts a radar level gauge, an ultrasonic level gauge or a laser ranging sensor.

[0010] Further, the CDQ bin is further provided with a dust discharging pipeline at the top, and a valve is arranged on the dust discharging port at the end of the dust discharging pipeline.

[0011] The application further provides a use method of the device for high-temperature blast furnace injection of a large amount of CDQ powder. (1) connecting the material receiving pipeline to the receiving tank truck, opening the valve on the branch pipeline connected to the nitrogen tank, and starting the vacuum pump to suck the CDQ powder generated in the coking process in the receiving tank truck into the CDQ bin together with nitrogen through negative pressure; (2) starting the screw feeder to continuously and stably deliver the CDQ powder in the CDQ bin to the electronic belt scale below; according to the set CDQ powder and other injection coal ratio, the CDQ powder amount falling on the electronic belt scale is controlled by controlling the opening degree of the feeding port of the screw feeder; (3) delivering the CDQ powder to the coal feeding main belt through the electronic belt scale, and mixing the CDQ powder with other injection coal delivered by the coal feeding main belt on the coal feeding main belt to enter the coal mill; (4) when the material level in the CDQ bin is lower than the set lower limit of the material level through the material level monitor, repeating step (1) to supplement the CDQ powder in the CDQ bin until the material level in the CDQ bin reaches the set upper limit of the material level through the material level monitor.

[0012] Compared with the prior art, the application has the following advantages: The device for high-temperature blast furnace injection of a large amount of CDQ powder and the use method thereof can meet the requirement of high-temperature blast furnace injection of a large amount of CDQ powder, realize uniform and stable ratio, and realize on-site dust suppression without causing secondary environmental pollution. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those of ordinary skill in the art without any creative effort based on these drawings.

[0014] Figure 1 The device structure diagram for the blast furnace injection of a large amount of CDQ powder.

[0015] In the figure: 1, CDQ powder bin; 2, dust removal device; 3, nitrogen tank; 4, ash discharge port; 5, maintenance plug valve; 6, water spraying device; 7, screw feeder; 8, electronic belt scale; 9, coal feeding main belt. DETAILED DESCRIPTION

[0016] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort belong to the scope of protection of the present application.

[0018] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0019] The foregoing description, for purposes of clarity, describes the present application in terms of its components, processes and operations. Such descriptions and representations are the means used by those skilled in the art of describing the physical structure, configuration, and operation of implementations of the present application. However, the application is not limited to the descriptions and representations. Although the foregoing embodiments have been described in some detail for purposes of clarity of understanding, it will be apparent that certain changes and modifications can be practiced within the scope of the appended claims. Accordingly, the present embodiments are to be considered as illustrative and not restrictive, and the present application is not to be limited to the details given herein, but can be modified within the scope and range of equivalents of the appended claims. In the claims, means-plus-function clauses, if used, are intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Thus although different goods or methods can not be patentably equivalent to one another, they can be within the equivalent structure for activities recited in the means-plus-function clauses.

[0020] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by orientation words such as "front, back, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like are generally based on the orientations or positional relationships shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer relative to the outline of each component itself.

[0021] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices as described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0022] In addition, it should be noted that the use of the words "first", "second" and the like to describe various components is merely intended to distinguish the corresponding components, and such words do not have special meanings unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0023] Example 1 AsFigure 1 As shown, the present invention provides a device for injecting large quantities of CDQ powder into a blast furnace, including a CDQ powder silo 1, a screw feeder 7, an electronic belt scale 8, and a main coal conveyor belt 9; The CDQ powder silo 1 contains CDQ powder, with a receiving port at the top and a discharge port at the bottom. A receiving pipe is installed at the receiving port, the other end of which is connected to a receiving truck used to transport the CDQ powder. A vacuum pump is installed on the receiving pipe. The discharge port is connected to the inlet of the screw feeder 7 via a discharge pipe. The inlet of the screw feeder 7 is located above the electronic belt scale 8, and the screw feeder 7 is used to transport the CDQ powder from the CDQ powder silo 1 to the electronic belt scale 8. The electronic belt scale 8 runs in the same direction as the main coal conveyor belt 9. The electronic belt scale 8 is located above the main coal conveyor belt 9 and is used to monitor the amount of CDQ powder being conveyed. The front section of the electronic belt scale 8 overlaps with the rear section of the main coal conveyor belt 9 in terms of horizontal projection, thereby ensuring that the CDQ powder conveyed by the electronic belt scale 8 can fall onto the main coal conveyor belt 9 and mix with other pulverized coal types conveyed by the main coal conveyor belt 9 before entering the coal mill.

[0024] Furthermore, the main coal conveyor belt 9 and the electronic belt scale 8 can be installed on the ground via support frames.

[0025] Furthermore, the receiving truck is used to load and transport CDQ powder produced in the coking process; the vacuum pump is used to draw the CDQ powder in the receiving truck into the CDQ powder silo 1 through negative pressure; the receiving pipeline is also connected to the nitrogen tank 3 through a branch pipeline; the nitrogen tank 3 is used to provide nitrogen as the carrier gas for transporting CDQ powder when the CDQ powder is transported by the vacuum pump; and the branch pipeline is equipped with a valve.

[0026] Furthermore, a dust removal device 2 is installed at the receiving port, and the receiving pipe is connected to the inlet of the dust removal device 2. The dust removal device 2 is used to prevent dust from being generated when CDQ powder is conveyed to the CDQ powder silo 1. The dust removal device 2 can be a bag filter.

[0027] Furthermore, a maintenance slide valve 5 is installed at one end of the discharge pipe near the discharge port. By controlling the opening and closing of the maintenance slide valve 5, the connection between the discharge pipe and the screw feeder 7 is controlled, thereby facilitating the maintenance of the CDQ silo 1.

[0028] Furthermore, it also includes a water spraying device 6 disposed above the electronic belt scale 8, the water spraying device 6 being used to spray water onto the electronic belt scale 8 for dust suppression when the electronic belt scale 8 is conveying CDQ powder.

[0029] Furthermore, the CDQ silo 1 is equipped with a level monitor for real-time monitoring of the CDQ powder level inside. The level monitor is a radar level gauge, an ultrasonic level gauge, or a laser rangefinder sensor.

[0030] Furthermore, an ash discharge pipe is installed on the top of the CDQ silo 1, and a valve is installed at the ash discharge port 4 at the end of the ash discharge pipe.

[0031] The method of using the device for injecting large quantities of CDQ powder into a blast furnace according to the present invention specifically includes the following steps: (1) Connect the receiving pipe to the receiving truck, open the valve on the branch pipe connected to the nitrogen tank 3, and start the vacuum pump to suck the CDQ powder generated in the coking process in the receiving truck into the CDQ silo 1 along with the nitrogen through negative pressure. (2) Start the screw feeder 7 to continuously and stably transport the CDQ powder in the CDQ silo 1 to the electronic belt scale 8 below; according to the set ratio of CDQ powder to other pulverized coal, control the amount of CDQ powder falling on the electronic belt scale 8 by controlling the opening of the feed port of the screw feeder 7. (3) The CDQ powder is conveyed to the main coal conveyor belt 9 by the electronic belt scale 8, and mixed with other pulverized coal types conveyed by the main coal conveyor belt 9 before entering the coal mill. (4) When the material level in CDQ silo 1 is detected by the material level monitor to be lower than the set lower limit, repeat step (1) to add CDQ powder to CDQ silo 1 until the material level monitor detects that the material level in CDQ silo 1 has reached the set upper limit.

[0032] Furthermore, in step (1), the dust removal device 2 is activated to prevent dust from being generated when CDQ powder is conveyed to the CDQ powder silo 1.

[0033] Furthermore, in step (2), the water spraying device 6 is activated to spray water onto the electronic belt scale 8 to suppress dust.

[0034] The device provided by this invention for the large-scale use of CDQ powder in blast furnace injection can meet the requirement of using a large amount of CDQ powder during blast furnace injection, and can achieve a uniform and stable ratio. At the same time, it can also prevent dust generation on site and avoid secondary pollution to the environment.

[0035] The device described in this invention for injecting large quantities of CDQ powder into blast furnaces was applied to two 3200m³ blast furnaces of Benxi Northern Iron Industry Co., Ltd. 3On one side of the existing pulverized coal storage area, a new device as described in this invention is constructed for injecting large quantities of CDQ powder into the blast furnace. The proportion of CDQ powder can reach more than 15%, and the proportion can be made uniform and stable.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for injecting large quantities of CDQ powder into a blast furnace, characterized in that, This includes CDQ powder silos, screw feeders, electronic belt scales, and main coal conveyor belts; The CDQ powder silo contains CDQ powder, with a receiving port at the top and a discharge port at the bottom. A receiving pipe is installed at the receiving port, the other end of which is connected to a receiving truck used to transport the CDQ powder. A vacuum pump is installed on the receiving pipe. The discharge port is connected to the inlet of a screw feeder via a discharge pipe. The inlet of the screw feeder is located above the electronic belt scale, and the screw feeder is used to transport the CDQ powder from the CDQ powder silo to the electronic belt scale. The electronic belt scale runs in the same direction as the main coal conveyor belt and is located above the main coal conveyor belt. The electronic belt scale is used to monitor the amount of CDQ powder being conveyed. The front section of the electronic belt scale overlaps with the horizontal projection of the rear section of the main coal conveyor belt.

2. The apparatus for injecting large quantities of CDQ powder into a blast furnace according to claim 1, characterized in that, The vacuum pump is used to draw CDQ powder from the receiving truck into the CDQ powder silo through negative pressure. The receiving pipeline is also connected to a nitrogen tank through a branch pipeline. The nitrogen tank is used to provide nitrogen as the carrier gas for transporting CDQ powder when the vacuum pump is used to transport CDQ powder.

3. The apparatus for injecting large quantities of CDQ powder into a blast furnace according to claim 1, characterized in that, The receiving port is equipped with a dust removal device, and the receiving pipe is connected to the inlet of the dust removal device. The dust removal device is used to prevent dust from being generated when CDQ powder is conveyed to the CDQ powder silo.

4. The apparatus for injecting large quantities of CDQ powder into a blast furnace according to claim 1, characterized in that, A maintenance gate valve is installed at one end of the discharge pipe near the discharge port.

5. The apparatus for injecting large quantities of CDQ powder into a blast furnace according to claim 1, characterized in that, It also includes a water spraying device installed above the electronic belt scale, which is used to spray water onto the electronic belt scale to suppress dust when the electronic belt scale is conveying CDQ powder.

6. The apparatus for injecting large quantities of CDQ powder into a blast furnace according to claim 2, characterized in that, The CDQ silo is equipped with a level monitor for real-time monitoring of the CDQ powder level. The level monitor uses a radar level gauge, an ultrasonic level gauge, or a laser rangefinder.

7. A method of using the apparatus for injecting large quantities of CDQ powder into a blast furnace according to claim 6, characterized in that, Specifically, the following steps are included: (1) Connect the receiving pipe to the receiving truck, open the valve on the branch pipe connected to the nitrogen tank, and start the vacuum pump to suck the CDQ powder generated in the coking process in the receiving truck into the CDQ silo along with the nitrogen through negative pressure. (2) Start the screw feeder to continuously and stably transport the CDQ powder in the CDQ silo to the electronic belt scale below; according to the set ratio of CDQ powder to other pulverized coal, control the amount of CDQ powder falling on the electronic belt scale by controlling the opening of the screw feeder. (3) CDQ powder is conveyed to the main coal conveyor belt by an electronic belt scale and mixed with other pulverized coal types conveyed by the main coal conveyor belt before entering the coal mill. (4) When the material level in the CDQ silo is detected by the material level monitor to be lower than the set lower limit, repeat step (1) to add CDQ powder to the CDQ silo until the material level monitor detects that the material level in the CDQ silo has reached the set upper limit.

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