CN216480991U - Hazardous Waste Treatment System - Google Patents

Abstract

A hazardous waste disposal system, the system comprising: the system comprises a fluidized bed type gasification furnace (2) for generating pyrolysis gas by thermally decomposing solid waste containing lumpy hazardous waste, and a mixer (7) for mixing liquid hazardous waste and solid waste containing granular hazardous waste to generate mixed slurry. A supply path (6) extends from the mixer (7) to the gasification furnace (2), and the supply path (6) is provided with a pump (65) for sending out the mixed slurry.

Description

Hazardous Waste Treatment System

technical field

The utility model relates to a hazardous waste treatment system.

Background technique

Conventionally, there has been known a waste treatment system including a fluidized-bed gasifier that generates a thermally decomposed gas by thermally decomposing solid wastes such as general refuse (for example, refer to Japanese Patent Laid-Open No. 2004-144369).

A fluidized bed is formed in the lower part of the gasifier. In addition, the gasifier is connected to a chute above the fluidized bed, and the solid waste is introduced into the gasifier through the chute.

Utility model content

The problem to be solved by the utility model:

In recent years, it has been studied to gasify hazardous wastes such as pharmaceutical wastes and pesticide wastes by thermal decomposition in the same way as garbage. However, hazardous waste is generally collected separately as lump hazardous waste, liquid hazardous waste, granular hazardous waste, and the like. Among them, lump-shaped hazardous waste can be handled in the same way as general garbage.

However, after the liquid hazardous waste is put into the gasifier through the chute like general garbage, it evaporates before reaching the fluidized bed, or it may become a cause of clogging in the chute.

Therefore, an object of the present invention is to provide a hazardous waste treatment system that can perform gasification treatment by thermal decomposition of liquid hazardous wastes in addition to lump-shaped hazardous wastes.

In order to solve the above-mentioned problems, the hazardous waste treatment system of the present invention is characterized in that it is provided with: a solid waste containing lump-shaped hazardous waste is inputted through a chute, and a thermal decomposition gas is generated by thermally decomposing the inputted solid waste. a fluidized bed type gasifier; a mixer for mixing liquid hazardous waste and solid waste containing granular hazardous waste to generate a mixed slurry; and a mixer extending from the mixer to the gasification The supply path of the furnace and the pump that sends out the mixed slurry.

Effect of the utility model: According to the above structure, since the liquid hazardous waste is mixed with the granular hazardous waste, the mixed slurry is supplied to the gasifier by the pump, and the liquid hazardous waste can be fluidized without evaporating. bed. Therefore, not only the massive hazardous waste included in the solid waste, but also the liquid hazardous waste included in the mixed slurry can be gasified by thermal decomposition of the fluidized bed. Furthermore, since the mixed slurry and the solid waste containing the lumpy hazardous waste are separately supplied to the gasifier, the chute for solid waste is not blocked by the mixed slurry.

Description of drawings

FIG. 1 is a schematic configuration diagram of a hazardous waste treatment system according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of the gasifier.

Detailed ways

FIG. 1 shows a hazardous waste treatment system 1 according to an embodiment of the present invention. The system 1 includes a feeding device 4 , a fluidized-bed gasifier 2 , a secondary combustion device 3 and a boiler 14 . The feeding device 4 and the gasifier 2 are connected by a chute 11 , the gasifier 2 and the secondary combustion device 3 are connected by a duct 12 , and the secondary combustion device 3 and the boiler 14 are connected by a duct 13 .

In addition, although the illustration is omitted, the system 1 includes a storage facility (for example, a pit, a yard, etc.) for temporarily storing lump-shaped hazardous waste recovered from facilities such as hospitals and factories. Storage facilities (for example, containers, pits, etc.) for liquid hazardous waste recovered from the facility, and storage facilities (for example, containers or yards, etc.) for temporary storage of granular hazardous waste recovered from the facility ). For example, the average particle diameter of granular hazardous waste is 1 μm to 10 mm.

The feeding device 4 feeds the solid waste including the lump-shaped hazardous waste into the gasifier 2 through the chute 11 . Solid waste can be only lump-shaped hazardous waste, or a mixture of lump-shaped hazardous waste and general garbage.

The gasifier 2 generates thermally decomposed gas by thermally decomposing the input solid waste. A fluidized bed 25 is formed in the lower part of the gasifier 2 and a freeboard 20 is formed in the upper part, respectively.

The fluidized bed 25 is filled with a flow medium such as sand, and a plurality of air diffusers 26 are arranged at the bottom of the fluidized bed 25 . The primary air is supplied to the air diffusing device 26 , and the primary air is ejected from the air diffusing device 26 . Thereby, the fluid medium flows, the solid waste is thermally decomposed while being mixed with the fluid medium, and a thermal decomposition gas is generated. For example, the temperature of the fluidized bed 25 is 450 to 650°C. The thermally decomposed gas discharged from the fluidized bed 25 is supplied to the secondary combustion device 3 through the dilute phase zone 20 and the conduit 12 .

The secondary combustion device 3 secondary combustion of the thermally decomposed gas discharged from the gasifier 2 . The secondary combustion device 3 includes a secondary combustion furnace 31 forming a secondary combustion chamber 30 , an introduction pipe 34 interposed between the secondary combustion furnace 31 and the duct 12 , and a header 35 surrounding the introduction pipe 34 .

The secondary combustion furnace 31 includes a cylindrical peripheral wall 32 extending in the vertical direction, and a substantially conical ceiling wall 33 covering the upper opening of the peripheral wall 32 . The center of the ceiling wall 33 is provided with an opening, and the introduction pipe 34 extends upward from the opening.

The header 35 forms an annular air chamber 36 around the introduction pipe 34 for supplying secondary air. Although illustration is omitted, the introduction pipe 34 is provided with a plurality of nozzles for blowing secondary air from the air chamber 36 into the introduction pipe 34 . However, the nozzle may not be provided in the introduction pipe 34 but may be provided in the portion of the ceiling wall 33 facing the air chamber 36 . The burner 37 which forms a downward flame is arrange|positioned in the center in the introduction pipe 34. As shown in FIG.

Although illustration is omitted, the peripheral wall 32 of the secondary combustion furnace 31 is provided with a plurality of nozzles for blowing tertiary air in a substantially horizontal tangential direction of the peripheral wall 32 . The blowing of the tertiary air from these nozzles forms an air film along the inner peripheral surface of the peripheral wall 32 , thereby suppressing the ash content melted in the thermally decomposed gas from adhering to the inner peripheral surface of the peripheral wall 32 .

The boiler 14 recovers heat from the exhaust gas after the secondary combustion of the thermally decomposed gas discharged from the secondary combustion device 3 . Specifically, the boiler 14 converts the thermal energy of the exhaust gas discharged from the secondary combustion device 3 into steam, and the steam is supplied to a turbine connected to a generator.

Next, the feeding device 4 and the gasifier 2 will be described in detail with reference to FIG. 2 .

The gasifier 2 includes a cylindrical peripheral wall 21 extending in the vertical direction, a bottom wall 22 covering the lower opening of the peripheral wall 21 , and a ceiling wall 23 covering the upper opening of the peripheral wall 21 . In the present embodiment, the cross-sectional shape of the peripheral wall 21 is a circular shape, and the bottom wall 22 is an inverted cone shape. However, the cross-sectional shape of the peripheral wall 21 may be a rectangular shape, and the bottom wall 22 may be an inverted quadrangular pyramid shape.

The above-mentioned fluidized bed 25 is formed above the air diffuser 26 in the lower part of the peripheral wall 21 . That is, the ceiling wall 23 is located above the fluidized bed 25 . In addition, the flow medium constituting the fluidized bed 25 is discharged by the discharge machine 8 through the discharge port 24 provided in the lower part of the bottom wall 22 , and is returned to the gasification furnace 2 after removing foreign matter.

In the present embodiment, the ceiling wall 23 is formed in a stepped shape. Specifically, the ceiling wall 23 includes a vertical portion 23b disposed in the approximate center of the peripheral wall 21, an inclined portion 23a extending obliquely downward from the lower end of the vertical portion 23b, and a flat portion 23c extending horizontally from the upper end of the vertical portion 23b . And the chute 11 is connected to the inclined part 23a.

However, the shape of the gasifier 2 is not limited to this, and can be appropriately changed. Depending on the shape of the gasifier 2 , the chute 11 may also be connected to the peripheral wall 21 .

The feeding device 4 for feeding the solid waste into the gasification furnace 2 through the chute 11 includes, in the present embodiment, a horizontally extending cylindrical casing 41 and two screws 42 arranged in the casing 41 . The screw 42 functions to send out solid waste. However, the number of the screws 42 arranged in the housing 41 may be one or three or more. Alternatively, the feeding device 4 for feeding the solid waste into the gasification furnace 2 through the chute 11 is not limited to a screw type, and may be a piston type.

The solid waste is supplied to the feeding device 4 through the chute 10 . It is desirable that the solid waste be crushed to 200 mm or less before being supplied to the feeding device 4 .

In addition, the hazardous waste treatment system 1 of the present embodiment includes a mixer 7 that produces a mixed slurry by mixing liquid hazardous waste and solid waste containing granular hazardous waste. The supply path 6 extends from the mixer 7 to the gasifier 2 . For example, the viscosity of the mixed slurry is 1 to 1,000 Pa·s at normal temperature (for example, 20° C.).

In addition, the solid waste mixed with the liquid hazardous waste may be only granular hazardous waste, or may be a mixture of granular hazardous waste and general garbage.

In the present embodiment, a plurality of slurry inlets 5 are provided on the ceiling wall 23 of the gasification furnace 2 . In addition, these slurry input ports 5 are connected to the supply path 6 . For example, the slurry input port 5 is provided so that one slurry input port exists for every 2 to 6 m ² of the bed area of the fluidized bed 25 . In addition, in FIG. 1, although the inclined part 23a and the flat part 23c of the ceiling wall 23 are provided with one slurry supply port 5 each, the number and position of the slurry supply port 5 can be appropriately changed.

More specifically, the supply passage 6 includes a main passage 61 extending from the mixer 7 , and a plurality of branch passages 62 branched from the main passage 61 and connected to the slurry inlet 5 . The main flow passage 61 of the supply passage 6 is provided with a pump 65 that sends out the mixed slurry.

The pump 65 may be a rotary single pump, but is preferably a reciprocating pump. This is because even if foreign matter such as metal chips is mixed into the mixed slurry, the mixed slurry can be sent out smoothly.

As described above, in the hazardous waste treatment system 1 of the present embodiment, since the liquid hazardous waste and the granular hazardous waste are mixed, the mixed slurry is supplied to the gasifier 2 by the pump 65, and the liquid hazardous waste can be The hazardous waste reaches the fluidized bed 25 without evaporating. Therefore, in addition to the massive hazardous waste included in the solid waste, the liquid hazardous waste included in the mixed slurry can also be gasified by fluidized bed thermal decomposition. Furthermore, since the mixed slurry and the solid waste containing the lumpy hazardous waste are separately supplied to the gasifier 2, the chute 11 for solid waste is not blocked by the mixed slurry.

In addition, since the hazardous waste treatment system 1 of the present embodiment includes the secondary combustion device 3 and the boiler 14, the energy retained by the hazardous waste can be recovered.

Moreover, in this embodiment, since the feeder 4 includes the screw 42, it is possible to quantitatively feed the lumpy hazardous waste into the gasification furnace regardless of the properties of the lumpy hazardous waste.

(Variation).

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of not departing from the spirit of the present invention.

For example, depending on the size of the gasification furnace 2, the number of the slurry inlets 5 provided in the ceiling wall 23 may be one. However, as in the above-described embodiment, when the number of the slurry inlets 5 is plural, the mixed slurry can be dispersed and introduced into the gasification furnace 2 .

(Summarize).

The hazardous waste treatment system of the present invention is characterized in that it is provided with a fluidized-bed type gaseous bed type gas that generates a thermally decomposed gas by thermally decomposing the solid waste containing lump-shaped hazardous wastes into solid waste through a chute. a gasifier; a mixer that mixes liquid hazardous waste and solid waste containing granular hazardous waste to produce a mixed slurry; and a supply path extending from the mixer to the gasifier and sending it out The pump for mixing the slurry.

According to the above configuration, since the liquid hazardous waste and the granular hazardous waste are mixed, and the mixed slurry is supplied to the gasifier by the pump, the liquid hazardous waste can reach the fluidized bed without evaporating. Therefore, not only the lumpy hazardous waste included in the solid waste, but also the liquid hazardous waste included in the mixed slurry can be gasified by fluidized bed thermal decomposition. Furthermore, since the mixed slurry and the solid waste containing the lumpy hazardous waste are separately supplied to the gasifier, the chute for solid waste is not blocked by the mixed slurry.

For example, the viscosity of the mixed slurry may be 1 to 1,000 Pa·s.

The gasifier may include a ceiling wall positioned above the fluidized bed formed in the gasifier, the ceiling wall being provided with a plurality of slurry inlets, and these slurry inlets are connected to the supply path. According to this configuration, the dispersed mixed slurry can be put into the gasifier.

For example, the plurality of slurry input ports may be provided in such a manner that one slurry input port exists for every 2 to 6 m ² of the bed area of the fluidized bed.

The pump may be a reciprocating pump. According to this structure, even if foreign matter, such as a metal piece, is mixed in a mixed slurry, a mixed slurry can be sent out smoothly.

The above-mentioned hazardous waste treatment system may further include: a secondary combustion device for secondary combustion of the thermal decomposition gas discharged from the gasifier, and a secondary combustion device for secondary combustion of the thermal decomposition gas discharged from the secondary combustion device; A boiler that recovers heat from the exhaust gas after gas secondary combustion. According to this structure, the energy contained in the hazardous waste can be recovered.

The solid waste including the massive hazardous waste may be further provided with a feeding device for feeding the solid waste into the gasifier through the chute, the feeding device including a screw for sending out the solid waste . According to this structure, it is possible to quantitatively inject the lumpy hazardous waste into the gasifier regardless of the properties of the lumpy hazardous waste.

Symbol Description:

1 Hazardous waste treatment system

11 Chutes

14 Boiler

2 Gasifier

23 Ceiling Wall

3 Secondary combustion device

4 feeding device

42 screw

5 Slurry input port

6 supply routes

65 Pumps

7 Mixer.

Claims (7)

1. A hazardous waste treatment system, characterized in that it has: A fluidized bed type gasifier that inputs solid waste containing massive hazardous waste through a chute, and generates thermally decomposed gas by thermally decomposing the input solid waste; A mixer for mixing liquid hazardous waste and solid waste containing granular hazardous waste to form a mixed slurry; and The pump which is provided in the supply path extended from the said mixer to the said gasifier and sends out the said mixed slurry. 2 . The hazardous waste treatment system according to claim 1 , wherein the viscosity of the mixed slurry is 1 to 1,000 Pa·s. 3 . 3. The hazardous waste treatment system according to claim 1 or 2, wherein the gasifier comprises a ceiling wall located above the fluidized bed formed in the gasifier, The ceiling wall is provided with a plurality of slurry input ports, and these slurry input ports are connected to the supply path. 4 . The hazardous waste treatment system according to claim 3 , wherein the plurality of slurry input ports are provided in the form of one slurry input port per 2-6 m ² of the bed area of the fluidized bed. 5 . . 5. The hazardous waste treatment system of claim 1, wherein the pump is a reciprocating pump. 6. The hazardous waste treatment system according to claim 1, further comprising: a post-combustion device for post-combustion of the thermally decomposed gas discharged from the gasifier; and A boiler that recovers heat from the exhaust gas after the afterburning of the thermally decomposed gas discharged by the afterburning device. 7 . The hazardous waste treatment system according to claim 1 , further comprising an inlet for introducing the solid waste including the lump-shaped hazardous waste into the gasifier through the chute. 8 . material device; The feeding device includes a screw that sends out the solid waste.

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