Processing device using waste plastic as blast furnace injection auxiliary material

Abstract

The utility model discloses a processing device using waste plastics as blast furnace injection auxiliary materials. Comprising a coarse crusher and a crusher which are used for crushing waste plastics, a cleaning machine and a dehydrator which are used for cleaning the crushed plastics, a granulator for granulating the cleaned crushed plastics, and a blowing mechanism for mixing the prepared plastic granules with fuel for blowing and feeding; according to the utility model, waste plastics can be crushed into plastic particles with uniform particle sizes, the plastic particles can be fully mixed with pulverized coal for combustion, and the feeding uniformity can be further improved by feeding in a blowing manner, so that the full combustion treatment of the waste plastics is effectively ensured, and the harmless treatment and high-value recycling utilization of the waste plastics are realized; the technological process is simple, and the equipment automation degree is high.

Description

Technical Field

[0001] The utility model relates to the technical field of waste plastic treatment, in particular to a processing device for using waste plastic as auxiliary material for blast furnace injection. Background Art

[0002] Waste plastic is a kind of high molecular organic material with high calorific value and other resource utilization value. At present, the main methods of waste plastic treatment are incineration and landfill. However, it is undeniable that the above processes have significant problems such as low resource utilization, serious environmental pollution, and low product added value, and it is urgent to develop new technologies to improve them.

[0003] At present, waste plastics are mainly used to replace coal and other fuels as auxiliary fuels for blast furnaces and other industrial furnaces. However, the plastic particles produced by crushing are uneven in size and cannot be fully burned and utilized, resulting in waste residues such as slag, which will also lead to incineration residues and cause pollution and other problems. Utility Model Content

[0004] Technical purpose: In view of the shortcomings of the existing methods for treating waste plastics, the utility model discloses a processing device that can efficiently crush waste plastics and effectively maintain the particle size so that the waste plastics that are fully burned can be used as auxiliary materials for blast furnace injection.

[0005] Technical solution: To achieve the above technical objectives, the utility model adopts the following technical solution:

[0006] A processing device for using waste plastics as auxiliary materials for blast furnace injection, comprising a coarse crusher and a pulverizer for crushing waste plastics, a cleaning machine and a dehydrator for cleaning the crushed plastics, a granulator for granulating the cleaned plastics, and a blowing mechanism for mixing the prepared plastic granules with fuel for injection feeding; the pulverizer is arranged at the rear of the coarse crusher, and the waste plastics crushed by the coarse crusher are fed into the pulverizer through a conveyor; the cleaning machine is connected to the outlet of the pulverizer, and receives the crushed plastics for cleaning; the dehydrator is connected to the outlet end of the cleaning machine, and dehydrates the cleaned plastics, and feeds the dehydrated plastics into the material inlet of the granulator;

[0007] The blowing mechanism includes a silo for storing plastic pellets. The plastic pellets produced by the granulator are stored in the silo. A blowing tank and a blowing pipe for connecting the blowing tank with a spray gun are arranged at the lower part of the silo. The silo is connected to the feed port of the blowing tank. The airflow of the blowing tank is used to process the plastic pellets and feed them into the spray gun.

[0008] Preferably, the coarse crusher of the utility model is a double-roll crusher, and the spacing between the crushing roller teeth of the coarse crusher is 30-200 mm.

[0009] Preferably, the dehydrator of the present invention is a vertical centrifugal dehydrator.

[0010] Preferably, the granulator of the utility model adopts a twin-screw granulator, and the granulator is connected to a heat transfer oil circuit for heating the waste plastics. The heat transfer oil circuit includes a heat transfer oil pipe and a heat transfer oil heating furnace. The heated heat transfer oil enters the granulator through the heat transfer oil pipe to heat the waste plastics.

[0011] Preferably, the heat transfer oil pipe and the heat transfer oil heating furnace of the present invention are both coated with insulation material, the thickness of the insulation material outside the heat transfer oil heating furnace is 30-100mm, and the thickness of the insulation material outside the heat transfer oil pipe is 10-100mm.

[0012] Preferably, the spray tank and the spray pipe of the utility model are both made of steel structure material, and the design pressure is ≥0.5Mpa.

[0013] Beneficial effects: The processing device for using waste plastics as auxiliary materials for blast furnace injection provided by the utility model has the following beneficial effects:

[0014] 1. The utility model uses a coarse crusher and a crusher to crush waste plastics to form crushed plastics, and then uses a granulator to make the crushed plastics into plastic pellets with uniform particle size, with more than 95% of the particles being less than 5 mm, thereby ensuring that the plastics can be fully burned when sprayed into the furnace body, achieving harmless treatment of the plastics, while reducing the use of coal and saving energy.

[0015] 2. The utility model uses a cleaning machine and a dehydrating machine to clean the crushed plastic before granulation to prevent impurities carried on the plastic from affecting the granulation process.

[0016] 3. The utility model uses the high-temperature hot oil in the heat transfer oil circuit to soften the plastic, and processes it into particles with uniform particle size through a twin-screw granulator, so as to prepare qualified plastic particles that meet the requirements of blast furnace injection. The heat transfer oil heating furnace can use low-cost fuel gas such as blast furnace gas in steel plants as fuel for heating, thereby reducing the processing cost of waste plastics.

[0017] 4. The injection mechanism of the utility model utilizes airflow to drive plastic pellets and coal powder into the furnace body, which can improve the uniformity as much as possible so that both coal powder and plastic pellets can be fully burned. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0019] Figure 1 This is the overall structural diagram of the processing device of the utility model;

[0020] Among them, 1-coarse crusher, 2-crusher, 3-cleaner, 4-dehydrator, 5-granulator, 6-thermal oil pipe, 7-thermal oil heating furnace, 8-silo, 9-spray tank, 10-spray gun, 11-spray pipe, 12-plastic bundle. DETAILED DESCRIPTION

[0021] The present invention will be described more clearly and completely below by way of a preferred embodiment in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiment.

[0022] like Figure 1 The figure shows a processing device for using waste plastics as auxiliary materials for blast furnace injection disclosed by the utility model, comprising a coarse crusher 1 and a pulverizer 2 for crushing the waste plastics, a cleaning machine 3 and a dehydrator 4 for cleaning the crushed plastics, a granulator 5 for granulating the cleaned plastics, and a blowing mechanism for mixing the prepared plastic granules with fuel for blowing and feeding.

[0023] Generally, waste plastics are bundled to form plastic bundles 12 when they are collected. The bundled waste plastics can be directly put into the inlet of the coarse crusher 1 for crushing. The coarse crusher 1 of the utility model is a double-roll crusher, and the crushing roller teeth are made of wear-resistant steel. The crushing roller teeth spacing of the coarse crusher 1 is 30-200mm. More than 90% of the waste plastic particles after coarse crushing by the coarse crusher 2 are less than 100mm; then the crushed waste plastics are sent to the crusher 2 through a conveyor, and cut and crushed by the blade of the crusher 2. The blade in the crusher 2 is made of wear-resistant alloy steel, and the thickness of the blade is 2~20mm. The side length or diameter of the inlet of the crusher 3 is not less than 100mm, so that the crushed waste plastics can enter smoothly. More than 90% of the crushed plastic particles after fine crushing by the crusher 2 are less than 10mm.

[0024] Then the crushed plastic needs to be cleaned, and a cleaning machine 3 is used to stir and remove dust and other debris under a certain solid-liquid ratio. The cleaning liquid-solid ratio is preferably 5-20, and then a dehydrator 4 is used for dehydration treatment for subsequent softening and granulation. The dehydrator 4 of the utility model is a vertical centrifugal dehydrator. After centrifugal dehydration, the water content does not exceed 2%.

[0025] The granulator 5 of the utility model adopts a twin-screw granulator, and the granulator 5 is connected to a heat transfer oil circuit for heating the waste plastics. The heat transfer oil circuit includes a heat transfer oil pipe 6 and a heat transfer oil heating furnace 7. The heated heat transfer oil enters the granulator 5 through the heat transfer oil pipe 6 to heat the waste plastics. The boiling point of the heat transfer oil is not lower than 150°C. The heat transfer oil heating furnace 7 is a gas-fired heating furnace. The furnace body is made of pressure vessel steel, and the design pressure is not lower than 0.5Mpa. Low-cost fuel gas such as blast furnace gas in a steel plant can be used as fuel, thereby saving the cost of processing the waste plastics.

[0026] The outside of the heat-conducting oil pipe 6 and the heat-conducting oil heating furnace 7 are both covered with heat-insulating materials. The thickness of the heat-insulating materials outside the heat-conducting oil heating furnace 7 is 30-100 mm, and the thickness of the heat-insulating materials outside the heat-conducting oil pipe 6 is 10-100 mm.

[0027] The granulator 5 of the utility model heats the crushed plastic into soft melt state granulation under the temperature condition of 80-140°C, and the crushed plastic is transformed from solid to soft melt state by heating of heat transfer oil, and then extruded through a template with certain fine holes and cut into plastic pellets of certain particle size; the finished plastic pellets prepared have a particle size of less than 5mm for more than 95%.

[0028] The spraying mechanism of the utility model comprises a silo 8 for storing plastic pellets, a spray tank 9 and a spray pipe 11 for connecting the spray tank 9 with a spray gun 10 are arranged at the lower part of the silo 8, the silo 8 is connected with the feed port of the spray tank 9, and the airflow of the spray tank 9 is used to process the plastic pellets and feed them into the spray gun 10; the spray tank 9 and the spray pipe 11 are both made of steel structure material, with a design pressure of ≥0.5Mpa, and the main body of the spray gun 10 is made of heat-resistant and wear-resistant seamless steel pipe, and the wall thickness of the seamless steel pipe is not less than 100mm. The thickness of the plastic pellets and the pulverized coal is not less than 5mm; a ceramic lining is arranged in the seamless steel tube of the spray gun 10, and the thickness of the ceramic lining is not less than 3mm; a spray tank 9 is used to spray the plastic pellets and the pulverized coal into the tuyere of the blast furnace through the spray pipe 11 and the spray gun 10 under certain pressure conditions, and the outlet pressure of the spray gun 11 is not less than 0.05Mpa; before spraying, the plastic pellets need to be mixed with the pulverized coal in a ratio of 1% to 10% and placed in the silo 8, which generally ensures the combustion calorific value while achieving sufficient incineration of the plastic pellets.

[0029] By using the processing device of the utility model, waste plastics can be crushed into plastic particles with uniform particle size, so that they can be fully mixed with coal powder and burned, and the feeding method is used to further improve the uniformity of the feeding, thereby effectively ensuring the full combustion treatment of the waste plastics. The utility model realizes the harmless treatment of waste plastics and high-value resource utilization, has a simple process, a high degree of equipment automation, a short system processing cycle, high economic benefits, no environmental pollution emissions during the treatment process, and a large amount of energy saving and carbon reduction, etc., and has the advantages of significant economic and social benefits.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A processing device for using waste plastics as auxiliary materials for blast furnace injection, characterized in that: The invention comprises a coarse crusher (1) and a pulverizer (2) for crushing waste plastics, a cleaning machine (3) and a dehydrator (4) for cleaning the crushed plastics, a granulator (5) for granulating the cleaned plastics, and a blowing mechanism for mixing the plastic granules with fuel for spraying and feeding; the pulverizer (2) is arranged behind the coarse crusher (1), and the waste plastics crushed by the coarse crusher (1) are fed into the pulverizer (2) through a conveyor; the cleaning machine (3) is connected to the outlet of the pulverizer (2), and receives the crushed plastics for cleaning; the dehydrator (4) is connected to the outlet of the cleaning machine (3), and dehydrates the cleaned plastics, and feeds the dehydrated plastics into the material inlet of the granulator (5); The spraying mechanism comprises a silo (8) for storing plastic pellets. The plastic pellets produced by the granulator (5) are stored in the silo (8). A spraying tank (9) and a spraying pipe (11) for connecting the spraying tank (9) with a spray gun (10) are arranged at the lower part of the silo (8). The silo (8) is connected to a feed port of the spraying tank (9). The airflow of the spraying tank (9) is used to process the plastic pellets and feed them into the spray gun (10).

2. The processing device for using waste plastics as auxiliary materials for blast furnace injection according to claim 1, characterized in that: The coarse crusher (1) is a double-roll crusher, and the spacing between the crushing roller teeth of the coarse crusher (1) is 30-200 mm.

3. The processing device for using waste plastics as auxiliary materials for blast furnace injection according to claim 1, characterized in that: The dehydrator (4) is a vertical centrifugal dehydrator.

4. The processing device for using waste plastics as auxiliary materials for blast furnace injection according to claim 1, characterized in that: The granulator (5) is a twin-screw granulator. The granulator (5) is connected to a heat transfer oil circuit for heating the waste plastics. The heat transfer oil circuit comprises a heat transfer oil pipe (6) and a heat transfer oil heating furnace (7). The heated heat transfer oil enters the granulator (5) through the heat transfer oil pipe (6) to heat the waste plastics.

5. The processing device for using waste plastics as auxiliary materials for blast furnace injection according to claim 4, characterized in that: The exterior of the heat-conducting oil pipe (6) and the heat-conducting oil heating furnace (7) are both coated with heat-insulating material; the thickness of the heat-insulating material on the exterior of the heat-conducting oil heating furnace (7) is 30-100 mm, and the thickness of the heat-insulating material on the exterior of the heat-conducting oil pipe (6) is 10-100 mm.

6. The processing device for using waste plastics as auxiliary materials for blast furnace injection according to claim 1, characterized in that: The spray tank (9) and the spray pipe (11) are both made of steel structure material, and the design pressure is ≥0.5Mpa.

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