JPH08157834A - Treatment of waste plastic - Google Patents

Abstract

PURPOSE: To provide a method for increasing tar, light oil and gas which are by-products having high value added and obtained from coke oven by treating waste plastic with the coke oven. CONSTITUTION: A waste plastic is blended into a blending coal in a coke furnace or the waste plastic is charged into a space part of furnace top just after coal is charged into the coke furnace or the waste plastic is fed through an introduction hole which communicates to the space part of the furnace top in carbonization of coal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating waste plastic using an existing coke oven.

[0002]

2. Description of the Related Art As a method for treating waste plastics using an existing coke oven, for example, Japanese Unexamined Patent Publication (Kokai) No. 48-34901 proposes a method for producing coke by blending the waste plastics with a charging coal for producing coke. .

[0003]

Tar, gas oil and gas, which are by-products of a coke oven, are high value-added products together with coke.

As a method for treating waste plastic, for example, Japanese Unexamined Patent Publication (Kokai) No. 48-34901 proposes a method for producing coke by blending 9 to 23 wt% of waste plastic into charging coal for producing coke.

When the waste plastic is blended with the charging coal for the production of coke, there is an upper limit to the amount of the waste plastic in order to secure the target coke strength. There is no method to secure the target coke strength and process a large amount of waste plastic in the coke oven.

An object of the present invention is to provide a method for obtaining a large amount of tar, gas oil and gas with high added value by treating a large amount of waste plastic in a coke oven.

[0007]

In order to solve the above problems, in the present invention, a charging coal for the production of coke or a charging coal for the production of coke containing 0.1 to 1.0 wt% of waste plastic is added to the coke oven. After the charging, the waste plastic is charged into the furnace top space above the charging coal from the charging port, and the waste plastic is thermally decomposed during the carbonization to be recovered as tar, light oil, and gas.

Further, from the charging of the coke for the production of coke or the charging of the coke for the production of 0.1 to 1.0 wt% of waste plastic into the coke oven until the end of the carbonization, the top space of the coke oven It is a method of treating waste plastic, which comprises supplying waste plastic from a supply device leading to and then thermally decomposing the waste plastic during carbonization and recovering it as tar, light oil, and gas.

The waste plastics are wastes of plastics such as polyethylene and polyethylene terephthalate.

When a plastic containing chlorine such as polyvinyl chloride is contained, corrosive hydrogen chloride is generated when heated, so a plastic containing no chlorine is preferable.

[0011]

[Operation] The yield of the dry distillation product of waste plastic was measured by a coal dry distillation product retention measuring device. As shown in Table 1, there is much tar and gas. The yield of diesel fuel obtained from coal is about 1%, but the yield of diesel fuel obtained from waste plastic is relatively high at 5 wt%.

On the other hand, as a result of studying the relationship between the coke strength when the waste plastic was blended with the charging coal for the production of coke and the blending ratio of the waste plastic, even when the waste polyethylene was blended up to 1.0 wt% as shown in FIG. It was found that the coke strength does not decrease, but the coke strength decreases when the content exceeds 1.0 wt%.

When the blending ratio of waste plastic is 0.1 wt%, there is almost no effect, so the lower limit of the blending ratio of waste plastic is set to 0.1 wt%. Therefore, the blending ratio of waste plastic to the charging coal for coke production is 0.1 to 1.
It was set to 0 wt%.

As described above, in order to maintain the lower limit of coke strength, the upper limit of the compounding ratio in the charging coal for coke production is 1.0.
wt%.

The inventor of the present invention has considered that if the waste plastic is pyrolyzed during the carbonization in the furnace top space, more waste plastic can be processed and more tar, light oil and gas can be obtained.

For example, the furnace width is 430 mm, the furnace height is 6.5 m,
When the charging coal is charged into a coke oven having a carbonization chamber having a furnace length of 15.7 m, there is a space of 0.35 m in height above the charging coal. This is the furnace top space.

The temperature of the furnace top space during carbonization is 700-85.
It is 0 ° C., which is a sufficient temperature for the thermal decomposition of waste plastic.

The method of charging the waste plastic into the furnace top space is as follows.
After charging the charged coal containing 1.0 wt%, waste plastic is charged into the furnace top space using the supply device shown in FIG.

When 1 ton of waste plastic is charged in the furnace top space, the same amount of waste plastic as when the waste plastic is blended at about 5 wt% can be treated.

In addition, the charged coal or the waste plastics can be treated with 0.
After charging the charged coal mixed with 1 to 1.0 wt% and supplying the waste plastic to the furnace top space part using the supply device shown in FIG. 2 until the end of the dry distillation, more waste plastic is treated. Will be possible.

19 hours at a feed rate of 1 t / hr into the space at the top of the furnace.
When supplying waste plastic for a time, the same amount of waste plastic can be treated as when 79 wt% of waste plastic is blended.

[0022]

Example 1 Furnace width 430 mm, furnace height 6.5 m, furnace length 1
In a 5.7 m coke oven, 24 tons of 5% water and 27% of volatile matter on a dry basis were charged, and when operating at a furnace temperature of 1220 ° C, after charging coal, charging 1 ton of waste polyethylene was charged into the space on the top of the charcoal and dried. The yield of dry-distilled products at this time is shown in Table 2. More tar, light oil, and gas could be recovered than when only coal was carbonized.

[0023]

[Example 2] Furnace width 480 mm, furnace height 6.5 m, furnace length 1
A 5.7 m coke oven was charged with 24 tons of 5% moisture and 27% volatile matter on a dry basis, and when operating at 1220 ° C, wasted in the furnace top space above the charging coal. Polyethylene was fed at a feed rate of 1 t / hr for 19 hours after charging the coal. The yield of the dry-distilled product at this time is shown in Table 3. More tar, light oil, and gas could be recovered than when only coal was carbonized.

[0024]

[Table 1]

[0025]

[Table 2]

[0026]

[Table 3]

[0027]

Industrial Applicability Since the waste plastic treatment method of the present invention can treat waste plastic and recover tar, gas oil, and gas with high added value, it has great industrial value.

[Brief description of drawings]

FIG. 1 is a diagram showing the relationship between coke strength and waste plastic compounding ratio.

FIG. 2 is a diagram showing an apparatus for supplying waste plastic.

[Explanation of symbols]

 1 Rise pipe 2 Dry main 3 Top space 4 Charging (or coke) 5 Valve 6 Relay hopper 7 Supply hopper

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C10B 57/06

Claims (2)

[Claims] 1. A charging coal for producing coke, or a charging coal for producing coke containing 0.1 to 1.0 wt% of waste plastic is charged into a coke oven, and then above the charging coal from an inlet. A method for treating waste plastic, which comprises charging waste plastic into the furnace top space and thermally decomposing the waste plastic during carbonization to recover it as tar, light oil, or gas. 2. A coke oven top space from after the coke producing charge coal or the coke producing charge coal containing 0.1 to 1.0 wt% of waste plastic is charged into the coke oven until the end of the carbonization. A method for treating waste plastic, characterized in that waste plastic is supplied from a supply device leading to the section and is thermally decomposed during carbonization to be recovered as tar, light oil, and gas.