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Circulation type fluidized-bed furnace, treating system equipped with circulation type fluidized-bed furnace, and method of operating circulation type fluidized-bed furnace

A circulating fluidized bed and operating method technology, applied in fluidized bed combustion equipment, chemical instruments and methods, incinerators, etc., can solve the problems of cumbersome operation and increased cost, and achieve increased reaction area, reduced cost, reduced Effect of Small Blower Capacity

Active Publication Date: 2012-08-29
MITSUBISHI HEAVY IND ENVIRONMENTAL & CHEM ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in order to achieve dechlorination, it is necessary to blow slaked lime into the flue, and two kinds of limestone and slaked lime must be used as chemicals, which leads to not only an increase in cost, but also a problem of cumbersome operation.

Method used

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  • Circulation type fluidized-bed furnace, treating system equipped with circulation type fluidized-bed furnace, and method of operating circulation type fluidized-bed furnace
  • Circulation type fluidized-bed furnace, treating system equipped with circulation type fluidized-bed furnace, and method of operating circulation type fluidized-bed furnace
  • Circulation type fluidized-bed furnace, treating system equipped with circulation type fluidized-bed furnace, and method of operating circulation type fluidized-bed furnace

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no. 1 Embodiment

[0042] Hereinafter, preferred embodiments of the present invention will be described in detail in conjunction with the accompanying drawings. The scope of the present invention is not limited unless the dimensions, materials, shapes, relative arrangements, etc. of the components described in the present embodiment are specifically described, and they are merely illustrative examples.

[0043] The treatment objects in the circulating fluidized bed boiler of this embodiment are chlorine-containing wastes, for example, sewage sludge, urban waste, industrial waste, etc., and the circulating fluidized bed boiler of this embodiment is especially suitable for sewage sewage Mud treatment. While the circulating fluidized bed boiler burns these wastes, it also desulfurizes the furnace by putting in desulfurization materials, so as to achieve desulfurization and dechlorination.

[0044] refer to figure 1 The circulating fluidized bed boiler and processing system of this embodiment will...

no. 2 Embodiment

[0077] Hereinafter, a second embodiment of the present invention will be described.

[0078] According to the first embodiment, by using a material having an average particle diameter smaller than the limit particle diameter of the cyclone separator 3 as the desulfurization material, the dechlorination effect can be improved. However, nitrogen compounds may be contained in wastes fed to circulating fluidized bed boilers. For waste containing nitrogen compounds, the furnace exhaust gas will contain nitrogen compounds (NH 3 , HCN and N 2 O, etc.). For example, when sewage sludge is thrown in as waste, the content of nitrogen compounds tends to increase. In addition, the present inventors also found that when only the desulfurization material (hereinafter referred to as the first desulfurization material) whose average particle size is smaller than the limit particle size of the cyclone separator 3 is used, nitrogen compounds (NH 3 , HCH, N 2 O, etc.) concentration increases...

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Abstract

Provided is a circulation type fluidized-bed furnace in which desulfurization is conducted within the furnace to thereby attain a sufficient dechlorination efficiency together with desulfurization. The furnace enables desulfurization and dechlorination to be easily conducted at low cost. Also provided is a treating system equipped with the circulation type fluidized-bed furnace. In the circulation type fluidized-bed furnace (1), a waste containing a chlorinated substance is mixed with a fluidized medium and burned, and the fluidized medium is separated and collected from the waste combustion gas with a cyclone (3) and is circulated and used. A desulfurizing material constituted of a powder of a calcium compound is introduced into the furnace to conduct desulfurization therein. The desulfurizing material has a maximum particle diameter of 100 [mu]m or smaller. The cyclone (3) has such particle-separating performance that the cyclone (3) traps the fluidized medium but permits the desulfurizing material to be discharged therefrom while accompanying the waste combustion gas. With the desulfurizing material discharged while accompanying the waste combustion gas, desulfurization and dechlorination are conducted in a flue (21) extending from the cyclone (3).

Description

technical field [0001] The present invention relates to a circulating fluidized bed boiler and a system equipped with the circulating fluidized bed boiler for incinerating sewage sludge, urban garbage, industrial waste and other wastes. A circulating fluidized bed boiler for performing desulfurization reaction and dechlorination reaction using desulfurization materials, and a system including the circulating fluidized bed boiler. Background technique [0002] Conventionally, circulating fluidized bed boilers have been widely used in the combustion treatment of waste such as sewage sludge, municipal waste, and industrial waste. A circulating fluidized bed boiler is a device that uses primary air introduced from the bottom of a riser to mix waste with a flow medium while causing them to burn and scatter, and introduces secondary air to make the scatter flow medium flow with it. It enters the dilute phase section (freeboard) to completely burn the unburned components in the ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G5/30F23C10/10
CPCF23J15/025F23G5/30F23J7/00F23G5/50F23J15/027B01D2257/302F23G7/001B01D53/508B01D2251/404F23L2900/15043F23J2217/10F23J2219/60F23G2207/60F23J15/003F23J2215/20B01D2251/606
Inventor 山内恒树小高成贵黑山和宏泽田伸一吉田季男林庆一铃木康裕
Owner MITSUBISHI HEAVY IND ENVIRONMENTAL & CHEM ENG CO LTD
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