Apparatus and method for gasification of refuse and hyperthermia melt processing of flying ash

A high-temperature melting and processing device technology, which is applied in the field of waste gasification and fly ash high-temperature melting integrated processing devices, can solve the problems of heavy metals and dioxins exceeding the standard, and achieve low operating costs, high combustion heat intensity, and slag collection rate high effect

Active Publication Date: 2010-06-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the heavy metals and dioxins in the bag-collected ash of the existing garbage incinerators seriously exceed the standard, and provide a garbage gasification and fly ash high-temperature melting treatment device and method

Method used

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  • Apparatus and method for gasification of refuse and hyperthermia melt processing of flying ash
  • Apparatus and method for gasification of refuse and hyperthermia melt processing of flying ash
  • Apparatus and method for gasification of refuse and hyperthermia melt processing of flying ash

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specific Embodiment approach 1

[0008] Specific implementation mode one: combine figure 1 Describe this embodiment, this embodiment consists of a fluidized bed gasifier 1, a feeder 2, an air distributor 3, a drum slag cooler 4, a burner 5, a cyclone furnace 6, a slag pool 8, a water wall 11, The burnout chamber 12, the spout 13, the steam drum 14, the superheater 15, the economizer 16, the air preheater 17, the flue 18 and the rotating secondary tuyere 20, the steam drum 14 is arranged on the top of the burnout chamber 12, A feeder 2 is provided on the side wall of the fluidized bed gasification furnace 1, and an air distribution plate 3 is provided at the lower part of the inner chamber of the fluidized bed gasification furnace 1, and a drum slag cooler 4 is provided at the lower part of the air distribution board 3, The drum slag cooler 4 has the function of separating fine sand and large non-combustibles. The upper part of the fluidized bed gasifier 1 communicates with the cyclone furnace 6. The top of th...

specific Embodiment approach 2

[0009] Specific implementation mode two: combination figure 1 Describe this embodiment, the difference between this embodiment and specific embodiment 1 is: in this embodiment, a secondary air nozzle 7 is added at the outlet of the fluidized bed gasification furnace 1, and the secondary air nozzle 7 is arranged on the inner wall of the cyclone furnace 6 upper part. Air is sprayed into the cyclone furnace 6 through the secondary air nozzle 7 to provide the required air for combustible gas combustion from the fluidized bed gasification furnace 1, and the temperature inside the cyclone furnace 6 is 1400-1650 °C. In this embodiment, the cyclone furnace 6 is an oxidative atmosphere, and heavy metal oxides cannot be reduced to metals. The cyclone furnace 6 is a simple fly ash melting furnace, and metals are not recovered. At this time, the rotating secondary air outlet at the bottom of the burnout chamber 12 20 stop the air supply. Other compositions and connections are the same a...

specific Embodiment approach 3

[0010] Specific implementation mode three: combination figure 1 Describe this embodiment, the difference between this embodiment and specific embodiment one is: this embodiment also increases the dioxin blocker spout 19, and the dioxin blocker spout 19 is arranged in the economizer 16 400- In the 600°C interval, spray dioxin blocker (NH 3 , methylamine, etc.), can block the re-synthesis of dioxins, and further control the formation of dioxins at the tail. This is because in the temperature range of 200-500°C at the tail, the decomposed dioxin fragments (small molecules) are exposed to divalent copper ions (Cu 2+ ) will be re-synthesized to generate a small amount of dioxins. In order to prevent this reaction from proceeding smoothly, injection of dioxin blockers has achieved the purpose of further controlling dioxins. Other compositions and connections are the same as in the first embodiment.

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Abstract

A device and method for garbage gasification and flying ash high temperature melting treatment relates to an integrated technology for garbage gasification and flying ash high temperature melting. Theinvention aims at solving the problem that the heavy metals and dioxins in the ash collected by a hop-pocket in an incinerator for garbage gasification exceeds the standard limits greatly. The deviceis formed in the way that a fluidized bed gasifier is communicated with a cyclone furnace; the cyclone furnace is communicated with a burnt chamber and the burnt chamber is communicated with a flue.The method includes that the smoke and gas generated by the gasification of the garbage in the fluidized bed gasifier enters the cyclone furnace and burns with the help of coal powder; the heavy metals in the flying ash are reduced to metals and recycled; the dioxins in the flying ash are decomposed; the exhaust smoke and gas enters a tail gas treatment device after entering the burnt chamber, a superheater, a coal saving device and an air preheater. The invention leads the smoke and gas generated by the gasification and burning of the garbage in the fluidized bed gasifier to enter the cyclonefurnace for high temperature melting treatment so as to lead the dioxins in the tail gas collecting ash and in the tail gas to be respectively lower than 50ng-TEQ / kg, 0.1ng-TEQ / m{3}.

Description

technical field [0001] The invention relates to a garbage gasification and fly ash high-temperature melting integrated treatment device and method. Background technique [0002] In recent years, with the increasingly serious pollution of domestic garbage in my country, the harmless treatment of garbage has attracted people's attention. At present, domestic waste incineration plants generally use activated carbon to absorb heavy metals and dioxins in the flue gas, and cooperate with the bag filter to collect the smoke, heavy metals and dioxins in the exhaust gas in the ash collected by the bag filter. Although the bag filter The flue gas at the outlet of the filter meets or is lower than the current national environmental protection emission standards, but the heavy metals and dioxins in the bag filter dust (referred to as fly ash) seriously exceed the standard. The content of dioxins in bagged ashes of domestically produced waste incinerators can reach thousands of ng-TEQ / k...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G5/027F23G5/30F23G5/44F23L9/02F23L13/00
CPCY02E20/34
Inventor 别如山刘欢鹏裘俊卢杰张缦
Owner HARBIN INST OF TECH
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