CN216107035U

CN216107035U - Ironmaking carbon-containing solid waste recycling system

Info

Publication number: CN216107035U
Application number: CN202122318772.8U
Authority: CN
Inventors: 李志明; 刘永刚; 张泽润; 张德仁
Original assignee: Handan Iron and Steel Group Co Ltd; HBIS Co Ltd Handan Branch
Current assignee: Handan Iron and Steel Group Co Ltd; HBIS Co Ltd Handan Branch
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2022-03-22
Anticipated expiration: 2031-09-24

Abstract

The utility model relates to a system for recycling carbon-containing solid wastes in iron making, and belongs to the technical field of waste recycling equipment in the metallurgical industry. The technical scheme is as follows: the method comprises the steps that solid waste conveyed by a suction pressure conveying tank car (2) is input into a receiving storage tank (4) through a receiving storage tank input pipeline (3) under the power action of a nitrogen source (1), a solid waste outlet in the receiving storage tank (4) is connected with a raw coal blanking pipe (11) through a receiving storage tank output pipeline (9) and an adding device (10) at the tail end of the receiving storage tank output pipeline, the lower portion of the raw coal blanking pipe (11) is connected with an inlet of a medium-speed mill (12), an outlet of the medium-speed mill (12) is connected with a bag distribution box (8), a pulverized coal bunker (7) is connected with a blowing tank (16) through a pulverized coal blanking pipe (14), and the blowing tank (16) is connected with a blast furnace (18) through a coal blowing pipeline (17). The utility model has the beneficial effects that: can realize the closed recycling of the whole process and meet the requirement of environmental protection.

Description

Ironmaking carbon-containing solid waste recycling system

Technical Field

The utility model relates to a system for recycling carbon-containing solid wastes in iron making, and belongs to the technical field of waste recycling equipment in the metallurgical industry.

Background

During the iron-making production process, a large amount of carbon-containing solid wastes can be generated, such as fly ash in the coking process of a coking plant, sintered desulfurization and denitrification activated carbon and the like, the solid wastes have high fixed carbon content of about more than 70 percent and high recycling value, and if the solid wastes are recycled, the solid wastes can be sprayed into a blast furnace through a blast furnace coal powder injection system and can completely replace the action of a heating agent of coal powder. However, these solid wastes are usually in the form of fine powder, fine in particle size, low in density, volatile, liable to pollute the environment, and not easy to recycle. If no feasible and effective measures are available, the additive is directly added into the raw coal, not only the addition effect is not ideal, but also secondary pollution is caused, and the environmental requirements are influenced. Therefore, the fuel is generally added to the sintering coal or coke powder as sintering fuel, but due to the powdery characteristic of fine particles of solid wastes, even if the fuel is added to the sintering coal or coke powder, environmental pollution is easily caused, and the fuel is often absorbed by an environmental dust removal fan to influence the quality of surrounding air, so that the utilization effect is very limited. At present, no particularly good recycling method and device for fine-particle powdery carbon-containing solid wastes exist.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a system for recycling the carbon-containing solid wastes in iron making, which can realize the closed recycling of the whole process, meet the requirement of environmental protection and solve the problems in the background technology.

The technical scheme of the utility model is as follows:

a recycling system for carbon-containing solid wastes in ironmaking comprises a nitrogen source, a suction pressure-feed tank car, a receiving storage tank input pipeline, a receiving storage tank, a receiving tank diffusing pipeline, a coal dust bin, a bag distribution box, a receiving storage tank output pipeline, an adding device at the tail end of the receiving storage tank output pipeline, a raw coal blanking pipe, a medium-speed mill, a mixed output pipeline of waste flue gas and coal dust of the medium-speed mill, a coal dust blanking pipe, a blowing tank, a coal injection pipeline, a blast furnace, a return hole of the medium-speed mill and a coal feeder, wherein the solid wastes conveyed by the suction pressure-feed tank car are input into the receiving storage tank through the receiving storage tank input pipeline under the power action of the nitrogen source, a nitrogen outlet of the receiving storage tank is communicated with the coal dust bin through the receiving tank diffusing pipeline, a solid waste outlet in the receiving storage tank is connected with the raw coal blanking pipe through the receiving storage tank output pipeline and the adding device at the tail end of the receiving storage tank output pipeline, the coal feeder is arranged at the upper part of the raw coal blanking pipe, the lower part of the raw coal blanking pipe is connected with an inlet of the medium-speed mill, an outlet of the medium-speed mill is connected with a cloth bag box through a mixed output pipeline of waste flue gas and coal powder of the medium-speed mill, the cloth bag box is connected with a coal powder bin, the coal powder bin is connected with the injection tank through the coal powder blanking pipe, and the injection tank is connected with the blast furnace through a coal injection pipeline.

The adding device at the tail end of the output pipeline of the receiving storage tank is a metal hose quick connector with an elbow, one end of the metal hose quick connector with the elbow is in butt joint with the output pipeline of the receiving storage tank, and the other end of the metal hose quick connector with the elbow is connected with a raw coal blanking pipe.

The distance between the quick connector of the metal hose with the elbow and the coal feeder at the upper part of the raw coal blanking pipe is one third to one half of the distance between the coal feeder at the upper part of the raw coal blanking pipe and the medium-speed mill at the lower part of the coal blanking pipe.

The receiving storage tank is connected with a receiving storage tank nitrogen pressurizing pipeline, and the blowing tank is connected with a blowing tank nitrogen pressurizing pipeline.

In the system for recycling the carbon-containing solid wastes in iron making, the receiving storage tank, the intermediate-speed mill, the bag distribution box, the pulverized coal bin, the injection pipeline and the blast furnace are the conventional blast furnace pulverizing and injection system.

The utility model has the beneficial effects that: the whole process is closed and recycled for the fine particle powder solid waste, and the problems of serious environmental pollution and the like in the existing fine particle powder solid waste recycling process are solved.

Drawings

FIG. 1 is a schematic view of the installation of the present invention;

FIG. 2 is an enlarged view of FIG. 1A;

in the figure: the system comprises a nitrogen source 1, a suction pressure feed tank truck 2, a receiving storage tank input pipeline 3, a receiving storage tank 4, a receiving tank discharge pipeline 5, a receiving storage tank nitrogen pressurizing pipeline 6, a pulverized coal bin 7, a bag distribution box 8, a receiving storage tank output pipeline 9, an adding device 10 at the tail end of the receiving storage tank output pipeline, a raw coal blanking pipe 11, a medium-speed mill 12, a medium-speed mill waste flue gas and pulverized coal mixing output pipeline 13, a blanking pipe 14, a blowing tank nitrogen pressurizing pipeline 15, a blowing tank 16, a coal injection pipeline 17, a blast furnace 18, a medium-speed mill return hole 19 and a coal feeder 20.

Detailed Description

The utility model is further illustrated by way of example in the following with reference to the accompanying drawings.

Referring to the attached drawings 1-2, the iron-making carbon-containing solid waste recycling system is characterized in that: comprises a nitrogen source 1, a suction pressure-feed tank car 2, a receiving storage tank input pipeline 3, a receiving storage tank 4, a receiving tank discharge pipeline 5, a pulverized coal bunker 7, a bag distribution box 8, a receiving storage tank output pipeline 9, an adding device 10 at the tail end of the receiving storage tank output pipeline, a raw coal discharge pipe 11, a medium-speed mill 12, a mixed output pipeline 13 of waste flue gas and pulverized coal of the medium-speed mill, a pulverized coal discharge pipe 14, a blowing tank 16, a coal injection pipeline 17, a blast furnace 18, a return hole 19 of the medium-speed mill and a coal feeder 20, wherein the solid waste transported by the suction pressure-feed tank car 2 is input into the receiving storage tank 4 through the receiving storage tank input pipeline 3 under the power action of the nitrogen source 1, a nitrogen outlet of the receiving storage tank 4 is communicated with the pulverized coal bunker 7 through the receiving tank discharge pipeline 5, a solid waste outlet in the receiving storage tank 4 is connected with the raw coal discharge pipe 11 through the receiving storage tank output pipeline 9 and the adding device 10 at the tail end of the receiving storage tank output pipeline, the coal feeder 20 is arranged at the upper part of the raw coal blanking pipe 11, the lower part of the raw coal blanking pipe 11 is connected with the inlet of the medium-speed mill 12, the outlet of the medium-speed mill 12 is connected with the cloth bag box 8 through the medium-speed mill waste flue gas and coal powder mixed output pipeline 13, the cloth bag box 8 is connected with the coal powder bin 7, the coal powder bin 7 is connected with the injection tank 16 through the coal powder blanking pipe 14, and the injection tank 16 is connected with the blast furnace 18 through the coal injection pipeline 17.

In this embodiment, referring to fig. 1-2, the receiving and storing tank 4 is a cylindrical upper and conical lower structure, and its main function is to receive, store and uniformly and quantitatively output solid wastes. The solid waste transported by the pressure-feed tank truck 2 is sucked and transported into a receiving storage tank 4 through a pipeline under the power action of a nitrogen source 1. Nitrogen enters the pulverized coal bunker 7 through a diffusing pipeline, and solid waste is left in the receiving storage tank 4. When the solid waste is output, the nitrogen pressurizing pipeline is used for receiving the pressurizing of the storage tank, and then the output pipeline is used for realizing uniform and quantitative output.

The adding device at the tail end of the output pipeline of the receiving storage tank is a metal hose quick connector with an elbow. One end of the solid waste discharge pipe is butted with a solid waste discharge pipeline and is in spigot-and-socket pressing sealing connection, and the other end of the solid waste discharge pipe is provided with an elbow which extends into the raw coal discharge pipe but is not beyond the central line of the raw coal discharge pipe. The position of the fast joint and the raw coal blanking pipe interface is 1/3-1/2 of the upper distance between a coal feeder at the upper part of the raw coal blanking pipe and a medium-speed mill at the lower part. The quick connector of the metal hose is good in sealing, convenient to replace, capable of achieving quick replacement and free of influence on solid waste addition.

The working process provided by the utility model comprises the following steps:

the suction pressure-feed tank truck conveys fine-particle powdery solid wastes to a designated position, and the nitrogen power source pressurizes and fluidizes the solid wastes in the suction pressure-feed tank truck and then enters a receiving storage tank through an input pipeline in a pipeline gas-solid conveying mode. The nitrogen in the receiving storage tank enters the pulverized coal bunker through a diffusing pipeline of the receiving storage tank, and the solid waste is left in the receiving storage tank by means of gravity. And then, the solid waste in the receiving storage tank is pressurized and fluidized by nitrogen, is uniformly and quantitatively conveyed through an output pipeline and enters a raw coal blanking pipe through an adding device at the tail end of the pipeline. The solid waste and raw coal enter a medium-speed mill along a blanking pipe and are fully mixed in the mill. Because the powder process system of intermediate speed grinding is the negative pressure system, and unloading pipe department is the negative pressure state, and the solid useless output pipeline is the malleation state, therefore the powdered solid useless environmental protection of realizing of fine particle adds, does not have environmental pollution completely. The solid waste and the raw coal are fully mixed and ground under the driving of the rotation of the medium-speed mill, and finally the mixture is powdered and enters the bag box along the ascending pipeline by inert waste flue gas. After gas-solid separation in the cloth bag box, the inert waste flue gas is discharged outwards, and the solid powder is left in the coal powder bin. And the solid powder in the coal powder bin is finally sprayed into the blast furnace through the spraying tank and the spraying pipeline, so that the solid waste is recycled.

The utility model has the technical characteristics that:

(1) and (5) the requirement of solid waste adding position. The solid waste adding position is selected from 1/3-1/2 positions at the upper part of the blanking pipe between the coal feeder and the medium-speed mill. The position has the advantages that the negative pressure state (the negative pressure state of a medium-speed mill powder making system) at the blanking pipe and the positive pressure conveying state of the solid waste conveying pipeline are fully utilized, the safe and environment-friendly fine-particle powdery solid waste is ensured to be mixed with raw coal and added into the medium-speed mill together, and the fine-particle powdery solid waste cannot volatilize into the air to cause secondary pollution to the site environment. Other disadvantages of adding location: a) the side surface of the mill body is received by a fixing hole. The side surface of the mill body is provided with a pulverized coal return hole which can recover abnormal pulverized coal, but the return hole is blown in from the side surface, thereby influencing the air flow distribution in the mill, causing abrasion to the cone part of the mill, and the solid waste and the raw coal are not uniformly mixed. b) Receiving by a raw coal conveying belt. The fine-particle powdery solid wastes cannot be effectively mixed with raw coal, so that secondary air pollution is caused, and the environmental requirements are influenced.

(2) The tail end of the solid waste output pipeline adopts a metal hose quick joint structure with an elbow. The end of the solid waste output pipeline is quickly abraded and needs to be replaced regularly, and the conventional rigid welding steel pipeline is adopted, so that the replacement is very troublesome, and the solid waste conveying is influenced. The adopted quick joint of the metal hose is a socket joint type pipeline butt joint mode, has good sealing performance, is simple and convenient to replace, and can be replaced by utilizing a conveying gap.

Claims

1. A system for recycling carbon-containing solid waste in iron making is characterized in that: comprises a nitrogen source (1), a suction pressure-feed tank car (2), a receiving storage tank input pipeline (3), a receiving storage tank (4), a receiving tank diffusion pipeline (5), a pulverized coal bunker (7), a bag distribution box (8), a receiving storage tank output pipeline (9), an adding device (10) at the tail end of the receiving storage tank output pipeline, a raw coal blanking pipe (11), a medium-speed mill (12), a medium-speed mill waste flue gas and pulverized coal mixed output pipeline (13), a pulverized coal blanking pipe (14), a blowing tank (16), a coal injection pipeline (17), a blast furnace (18), a medium-speed mill return hole (19) and a coal feeder (20), wherein solid waste conveyed by the suction pressure-feed tank car (2) is input into the receiving storage tank (4) through the receiving storage tank input pipeline (3) under the power action of the nitrogen source (1), a nitrogen outlet of the receiving storage tank (4) is communicated with the pulverized coal bunker (7) through the receiving tank diffusion pipeline (5), the solid waste outlet in the receiving storage tank (4) is connected with a raw coal blanking pipe (11) through a receiving storage tank output pipeline (9) and an adding device (10) at the tail end of the receiving storage tank output pipeline, a coal feeder (20) is arranged on the upper portion of the raw coal blanking pipe (11), the lower portion of the raw coal blanking pipe (11) is connected with an inlet of a medium-speed mill (12), an outlet of the medium-speed mill (12) is connected with a bag distribution box (8) through a medium-speed mill waste flue gas and pulverized coal mixed output pipeline (13), the bag distribution box (8) is connected with a pulverized coal bunker (7), the pulverized coal bunker (7) is connected with a blowing tank (16) through a pulverized coal blanking pipe (14), and the blowing tank (16) is connected with a blast furnace (18) through a coal spraying pipeline (17).

2. The system for recycling ironmaking carbon-containing solid waste according to claim 1, characterized in that: the adding device (10) at the tail end of the output pipeline of the receiving storage tank is a metal hose quick connector with an elbow, one end of the metal hose quick connector with the elbow is butted with the output pipeline (9) of the receiving storage tank, and the other end of the metal hose quick connector with the elbow is connected with a raw coal discharging pipe (11).

3. The system for recycling ironmaking carbon-containing solid waste according to claim 2, characterized in that: the distance between the joint position of the metal hose quick connector with the elbow and the raw coal blanking pipe (11) and the coal feeder (20) at the upper part of the raw coal blanking pipe (11) is one third to one half of the distance between the coal feeder (20) at the upper part of the raw coal blanking pipe (11) and the medium-speed mill (12) at the lower part of the raw coal blanking pipe (11).

4. The system for recycling ironmaking carbon-containing solid waste according to claim 1, characterized in that: the receiving storage tank (4) is connected with a receiving storage tank nitrogen pressurizing pipeline (6), and the injection tank (16) is connected with an injection tank nitrogen pressurizing pipeline (15).