Method for purifying high-temp. smoke from garbage incinerator

A waste incinerator and high-temperature flue gas technology, which is applied to chemical instruments and methods, separation methods, and separation of dispersed particles, can solve problems such as lime absorption, increased heat loss, and high-temperature corrosion of heating surfaces, so as to avoid Or reduce high temperature corrosion, improve reaction efficiency, high reactivity effect

Inactive Publication Date: 2003-06-11
TONGJI UNIV
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Problems solved by technology

There are three main problems in this method of flue gas purification at the tail of the waste incinerator, which is usually lower than 300°C: (1) high temperature corrosion of the heating surface
In order to control the emission of dioxins into the atmosphere along with the flue gas, it is necessary to inject activated carbon into the flue gas to increase the operating cost of the flue gas purification system
(3) The collected fly ash and flue gas purification products are highly toxic
A large flow of flue gas flows through the high-temperature dust collector, which will increas...

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  • Method for purifying high-temp. smoke from garbage incinerator
  • Method for purifying high-temp. smoke from garbage incinerator

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Embodiment

[0023] Such as figure 1 The schematic diagram of the example device is shown. The high-temperature flue gas 1 enters the thermal insulation flue reactor 2, and the carrying amount of fly ash in the high-temperature flue gas is 5-6g / Nm 3 , the concentration of HCl gas is measured by the sampling system 8 . A certain amount of modified lime is sprayed countercurrently from the transport medium air 5 into the reactor 2 and mixed with the flue gas. The flow velocity of the flue gas in the reactor 2 is 12-13m / s, and the flow rate of the flue gas is 380-450m 3 / h range. In order to transport modified lime, the flow rate of compressed air is 6.3~7.5m 3 / h, the flow velocity at the nozzle is 15-18m / s. After the reaction, it is sent to the cyclone dust collector 6 to separate the reaction products. An insulating layer is arranged outside the reaction flue 2 and the dust collector 6 . Several pairs of thermocouples 9 are arranged in the reactor 2 to measure the reaction temperatu...

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Abstract

The method for cleaning high-temp. smoke produced by garbage incinerator is characterized by that in the flue gas with 600-800 deg.c discharged by garbage incinerator the sodium-alkali modified lime is added to make acid gas being in the flue gas react with sodium-alkali modified lime and be absorbed, then the solid reaction product and flyash carried by flue gas are collected by high-temp. dust-collector together, so that the solid reaction product can be separated from flue gas, and the cleaned flue gas can be fed into heated surface, and cooled, and the harmful substance de novo can not be synthesized in the flue gas, and the toxicity of the cleaned flue gas product and the flyash can be greatly reduced. Said invention is simple in process and good in effect.

Description

technical field [0001] The invention relates to a method for purifying high-temperature flue gas of a garbage incinerator, which is used for purifying flue gas discharged from various incinerators for burning garbage. Background technique [0002] The flue gas of waste incinerator (referred to as flue gas) contains acid gas HCl, Cl 2 , SO 2 and various pollutants such as fly ash, heavy metals and organic matter. Existing waste incinerator flue gas purification devices with waste heat recovery systems are installed between the rear heating surface and the chimney, such as typical dry, semi-dry and wet flue gas purification systems (A.John Chandler, T.TaylorEighmy et al. Municipal solid waste incinerator residues [M]. The Netherlands: Elsevier Science B.V., 1997. p101~133). There are three main problems in this waste incinerator tail flue gas purification method which is usually lower than 300°C: (1) high temperature corrosion of the heating surface. Studies have shown tha...

Claims

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Application Information

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IPC IPC(8): B01D53/40B01D53/81
Inventor 陈德珍朱彤张鹤声茅清希林瑜
Owner TONGJI UNIV
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