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Wet purification method and device for coal oxygen-enriched fly ash melting tail gas

A wet purification and tail gas technology, applied in the field of purification, can solve problems such as difficult trapping and removal, and achieve the effect of combining cooling and multiple effects, reducing the risk of scaling and blocking, and saving space.

Pending Publication Date: 2022-04-15
BEIJING RUNYU ENVIRONMENTAL PROTECTION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tail gas purification process of resistance furnace fly ash melting generally adopts the process of "water spray cooling + dry / wet deacidification"; while for coal oxygen-enriched fly ash melting tail gas, since coal powder is used in the fly ash melting process, the temperature of the melting furnace is low. High, therefore, the tail gas not only contains the above pollutants, but also releases more nitrogen oxides and dust. The current purification process cannot completely solve the secondary pollution of the tail gas, especially the high nitrogen oxides (NOx up to 1000mg / m 3 ), high dust (up to 20g / m 3 ), heavy metal elemental mercury is difficult to capture and remove

Method used

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  • Wet purification method and device for coal oxygen-enriched fly ash melting tail gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: as figure 1 As shown, a wet purification device for coal oxygen-enriched fly ash melting tail gas includes a garbage fly ash melting furnace 1, a quencher 2, a water washing tower 3, a wet electrostatic precipitator 4, an oxidation absorption tower 5, an alkali washing tower 6, induced draft fan 7, chimney 8, first cooling water heat exchanger 9, second cooling water heat exchanger 10, first circulating water pump 11, second circulating water pump 12, third circulating water pump 13, first waste water storage tank 21, Second wastewater storage tank 22, first wastewater delivery pump 14, second wastewater delivery pump 16, first wastewater discharge pump 15, second wastewater discharge pump 17, first fluid replacement pump 18, second fluid replacement pump 19, third fluid replacement pump 20.

[0029]The upper part of the fly ash melting furnace 1 is connected to the top of the quencher 2, the bottom of the quencher 2 is connected to the top of the water w...

Embodiment 2

[0030] Embodiment 2: as figure 1 As shown, a method and device for wet purification of coal oxygen-enriched fly ash fusion tail gas comprise the following steps:

[0031] The high-temperature tail gas is released from the upper part of the fly ash melting furnace 1, enters the quench tower 2 and cools down to 120-150°C instantly, enters the water washing tower 3 for pre-dust removal, acid removal, and cools down to below 80°C, enters the wet electrostatic precipitator 4 for deep dust removal, and enters Oxidation absorption tower 5 denitrates, deacidifies, removes mercury, cools down to 50-70°C, then enters alkali washing tower 6 to further remove residual acid gas, and finally the purified tail gas is discharged into chimney 8 through induced draft fan 7.

[0032] The water washing tower 3, the oxidation absorption tower 5 and the alkali washing tower 6 are respectively equipped with a first circulating water pump 11, a second circulating water pump 12 and a third circulating...

Embodiment 3

[0035] Embodiment 3: as figure 1 As shown, a method and device for wet purification of coal oxygen-enriched fly ash fusion tail gas,

[0036] Including the following steps:

[0037] (1) The molten tail gas of coal oxygen-enriched fly ash is cooled to below 120-150°C through the quenching tower; it enters the water washing tower for pre-dust removal and acid removal, and the temperature is lowered to below 80°C; it goes through the wet electrostatic precipitator for deep dust removal; it goes through the oxidation absorption tower for denitrification, Desulfurization, demercury, cooling to 50-70°C; further deacidification through the alkali washing tower, and finally the purified tail gas is discharged into the chimney through the induced draft fan;

[0038] (2) The waste water discharged from the water washing tower and the oxidation absorption tower is purified and treated respectively to obtain metal chlorides, sulfates and nitrates for recycling;

[0039] The quench tower...

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Abstract

The invention discloses a wet purification method and device for coal oxygen-enriched fly ash melting tail gas, and belongs to the technical field of purification. High-temperature tail gas released by the coal oxygen-enriched fly ash melting furnace is cooled to 120-150 DEG C or below through a quench tower; sequentially entering a water washing tower for dust pre-removal and acid removal, and cooling to below 80 DEG C; deeply removing dust through a wet electrostatic dust collector; carrying out denitration, desulfurization and demercuration through an oxidation absorption tower, and cooling to 50-70 DEG C; further deacidification is carried out through an alkaline washing tower, and finally purified tail gas is discharged into a chimney through an induced draft fan; and respectively purifying the wastewater discharged from the water washing tower and the oxidation absorption tower to obtain metal chlorine salt, sulfate and nitrate, and recycling the metal chlorine salt, sulfate and nitrate. According to the invention, the advantages of deacidification, denitration, demercuration and dust removal integrated cooperative treatment can be fully and effectively exerted, and the flue gas can reach the standard and even be discharged in an ultra-clean manner; recyclable salts are obtained through wastewater purification treatment, and resource utilization is achieved.

Description

technical field [0001] The invention relates to a wet purification method and device for coal oxygen-enriched fly ash fusion tail gas, belonging to the technical field of purification. Background technique [0002] After domestic waste is incinerated, fly ash of 2%-5% of the original waste will be produced. The fly ash contains more volatile heavy metals such as mercury, lead, chromium, and highly toxic substances such as dioxin. Ash is hazardous waste and must be treated specially. At present, the commonly used treatment methods are: cement solidification method, chemical treatment method, melting solidification method. Among them, the melt-solidification method has the advantages of reduction, harmlessness, and resource utilization, and has become the most promising treatment method. The melt solidification method is to form a stable glass phase at high temperature (greater than 1300°C), which greatly reduces the possibility of heavy metal dissolution. However, the proc...

Claims

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Application Information

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IPC IPC(8): F23J15/02F23J15/06F23J15/04
CPCY02E20/34
Inventor 安璐韩志明杨帆
Owner BEIJING RUNYU ENVIRONMENTAL PROTECTION ENG
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