CN210332265U

CN210332265U - Half-dry deacidification device for household garbage incineration flue gas

Info

Publication number: CN210332265U
Application number: CN201921151991.8U
Authority: CN
Inventors: 石迎春; 何永胜
Original assignee: Shanghai Gem Environmental Technology Engineering Co ltd
Current assignee: Shanghai Gem Environmental Technology Engineering Co ltd
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2020-04-17
Anticipated expiration: 2029-07-22

Abstract

The utility model provides a half dry-type deacidification device of domestic waste incineration flue gas, include: the semi-dry reaction tower is used for removing acid gas in the flue gas; the cyclone dust collector is used for separating and collecting large-particle solids in the flue gas; the slaked lime feeding back system is used for collecting large-particle solids in an ash bucket at the bottom of the cyclone dust collector and conveying slaked lime into a flue between the semi-dry reaction tower and the cyclone dust collector; the fly ash treatment device is used for collecting large granular solids at the bottoms of the semi-dry reaction tower and the cyclone dust collector; the lime slurry preparation system is used for conveying a lime slurry absorbent to the interior of the semi-dry reaction tower; and the slaked lime storage tank is used for conveying the slaked lime absorbent into the slaked lime feed back system. The utility model discloses an add cyclone and lime hydrate feed back system, spray the lime hydrate absorbent in the flue between semi-dry reaction tower and cyclone, further improve the desorption rate of acidic material in the flue gas.

Description

Half-dry deacidification device for household garbage incineration flue gas

Technical Field

The utility model relates to a flue gas pollution administers the field, concretely relates to half dry deacidification device of domestic waste incineration flue gas.

Background

Compared with the traditional refuse landfill mode, the refuse incineration power generation technology has the advantages thatHas a series of advantages of realizing the reclamation of garbage and effectively relieving the problem of environmental pollution, etc. But a large amount of acid gases (such as HCl, HF, SO) generated in the incineration process₂Etc.) must be further processed, otherwise acid rain will be formed, polluting the environment. In the process of burning garbage, the semi-dry method flue gas purification technology becomes a hotspot for development and research at present.

The semidry method flue gas purification process integrates the dual advantages of dry method and wet method flue gas treatment, and the purification process not only has no waste water discharge, but also can achieve higher purification efficiency. The semidry process absorbent generally adopts Ca (OH)₂Ca (OH) to be prepared₂The slurry is sprayed into the reaction tower by an atomizer arranged at the top of the semi-dry reaction tower, the atomizer generates shearing action at high speed to enable the slurry to form liquid drops with extremely small particle size, then the liquid drops are fully contacted with the flue gas, the temperature of the flue gas is reduced by volatilization of water in the liquid drops, meanwhile, the humidity of the flue gas is improved, and the lime slurry liquid drops react with the acid gas to generate neutral salts so as to remove the acid gas. Some acid gases such as HCl, HF, etc. are easily reacted with Ca (OH)₂The reaction has the removal efficiency of more than 90 percent, but for SO₂The efficiency is low, the desulfurization efficiency is only 80-90%, and the atomizer of the semi-dry process is a mobile device which is arranged in the reaction tower and is sensitive to the ambient temperature. Therefore, it is necessary to develop a new semi-dry deacidification apparatus based on the conventional semi-dry deacidification apparatus to improve the removal rate of the acidic substances in the flue gas.

Disclosure of Invention

The utility model provides a half dry deacidification device of domestic waste incineration flue gas through add equipment such as cyclone, lime feed back system and lime hydrate storage tank behind traditional half dry reaction tower, increases the dwell time of reaction absorbent in the system, adds the reducing pipe simultaneously at flue gas entry flue end, strengthens the mixed effect that acid gas and rotary atomizer sprayed the lime mud, improves acid gas's desorption rate.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a half dry deacidification device of domestic waste incineration flue gas which characterized in that includes: the semi-dry reaction tower is used for removing acid gas in the flue gas; the cyclone dust collector is communicated with the semi-dry reaction tower and is used for separating and collecting large-particle solids in the flue gas; the slaked lime feeding back system is communicated with the ash bucket at the bottom of the cyclone dust collector and is used for collecting large-particle solids in the ash bucket at the bottom of the cyclone dust collector and conveying slaked lime into a flue between the semi-dry reaction tower and the cyclone dust collector; the fly ash treatment device is respectively communicated with the semi-dry reaction tower and an ash bucket at the bottom of the cyclone dust collector and is used for collecting large granular solids at the bottoms of the semi-dry reaction tower and the cyclone dust collector; the lime slurry preparation system is communicated with the semi-dry reaction tower and is used for conveying a lime slurry absorbent to the interior of the semi-dry reaction tower; and the slaked lime storage tank is communicated with the slaked lime return system and is used for conveying a slaked lime absorbent into the slaked lime return system.

Further, the semi-dry reaction tower comprises a flue gas inlet flue and a rotary atomizer; the rotary atomizer is arranged at the top end in the reaction tower and is arranged in a reverse direction with the flue gas inlet, so that the lime slurry is ensured to fully react with acidic components in the flue gas, and meanwhile, the temperature of the flue gas is utilized to completely evaporate the atomized lime slurry; the flue gas inlet flue comprises a flue reducer pipe arranged at the tail end of the flue gas inlet flue, and the sectional area of the outlet end of the flue reducer pipe is larger than that of the inlet end of the flue reducer pipe, so that the sectional area of flue gas at the outlet of the flue gas inlet flue is increased, and the mixing effect of spraying lime slurry by the rotary atomizer is enhanced.

Compared with the prior art, the utility model discloses a half dry deacidification device of domestic waste incineration flue gas has following beneficial effect:

(1) by additionally arranging a slaked lime return system, a slaked lime absorbent is sprayed in a flue between the semi-dry reaction tower and the cyclone dust collector, so that the removal rate of acidic substances in the flue gas is ensured;

(2) the cyclone dust collector is used for capturing the unreacted slaked lime absorbent in the large-particle solid, and circulation is formed in the cyclone dust collector and the slaked lime feeding back system, so that the retention time of the absorbent in the system is prolonged, the calcium-sulfur ratio of the reaction is reduced, and the using amount of the absorbent is reduced on the premise of meeting the standard emission of flue gas;

(3) the reducer pipe is additionally arranged at the tail end of the flue gas inlet flue, so that the contact area of the acid gas and the lime slurry sprayed by the rotary atomizer is increased, the mixing effect of the acid gas and the lime slurry is enhanced, and the removal rate of the acid gas is improved.

Drawings

The invention will be described in further detail with reference to the following drawings and embodiments:

fig. 1 is a schematic structural diagram of a specific embodiment of a semi-dry deacidification device for domestic waste incineration flue gas of the present invention;

fig. 2 is a schematic structural view of the semi-dry reaction tower of the present invention.

The reference numbers illustrate:

1-a semi-dry reaction tower; 2-cyclone dust collector; 3-lime hydrate feed back system; 4-a fly ash treatment unit; 5-a slaked lime storage tank; 6-a lime slurry preparation system; 7-flue gas inlet flue; 8-a rotary atomizer; 9-flue reducer pipe.

Detailed Description

In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in fig. 1, embodiment 1 discloses a specific embodiment of a semi-dry deacidification device for domestic waste incineration flue gas, which includes: the semi-dry reaction tower 1 is used for removing acid gas in the flue gas; the cyclone dust collector 2 is communicated with the semi-dry reaction tower 1 and is used for separating and collecting large-particle solids in the flue gas; the slaked lime feeding back system 3 is communicated with the ash bucket at the bottom of the cyclone dust collector 2 and is used for collecting unreacted slaked lime in the ash bucket at the bottom of the cyclone dust collector 2 and conveying the slaked lime into a flue between the semi-dry reaction tower 1 and the cyclone dust collector 2; the fly ash treatment device 4 is respectively communicated with the ash hoppers at the bottoms of the semi-dry reaction tower 1 and the cyclone dust collector 2 and is used for collecting large granular solids at the bottoms of the semi-dry reaction tower 1 and the cyclone dust collector 2; the lime slurry preparation system 6 is communicated with the semi-dry reaction tower 1 and is used for conveying a lime slurry absorbent to the interior of the semi-dry reaction tower 1; and the slaked lime storage tank 5 is communicated with the slaked lime return system 3 and is used for conveying a slaked lime absorbent into the slaked lime return system 3.

Containing HCl, HF, SO₂High-temperature flue gas containing acidic substances enters the semi-dry reaction tower 1 through a conveying pipeline and is fully contacted with lime slurry in the semi-dry reaction tower 1, wherein the main chemical component of the lime slurry is Ca (OH)₂And conveyed to the interior of the semi-dry reaction tower through a lime slurry preparation system 6. HCl, HF, SO in lime slurry and flue gas₂When the acid gas generates acid-base neutralization reaction, most of the acid substances in the flue gas are removed, and a part of solid salt generated by the reaction falls into an ash bucket at the bottom of the semi-dry reaction tower 1 under the action of gravity and is then conveyed to a fly ash treatment device 4 for uniform treatment. The flue gas enters a section of horizontal flue connected with a cyclone dust collector 2 after deacidification in a semi-dry reaction tower 1, contacts and mixes with slaked lime solid powder conveyed by a slaked lime return system 3, further generates neutralization reaction, and removes residual acidic substances in the flue gas. Then the flue gas and the slaked lime powder enter the cyclone dust collector 2 to continue to react fully, and the cyclone dust collector 2 has the function of separating and collecting large-particle solids in the flue gas, wherein the large-particle solids comprise unreacted slaked lime solid powder, solid salt generated by reaction, large-particle dust in the flue gas and the like and fall into an ash bucket at the bottom of the cyclone dust collector 2. The ash bucket at the bottom of the cyclone dust collector 2 is respectively communicated with the slaked lime feed back system 3 and the fly ash treatment device 4, when the system normally operates, a channel from the cyclone dust collector to the fly ash treatment device 4 is closed, the particulate matters at the bottom of the cyclone dust collector 2 are conveyed to the slaked lime feed back system 3, and the acid gas is circularly absorbed in the system by using the slaked lime powder which is not fully reacted in the particulate matters. When the slaked lime in the system fully reacts with the flue gas and the desulfurization efficiency is reduced, a channel from the cyclone dust collector to the slaked lime return system 3 is closed, the particulate matters in the ash bucket at the bottom of the cyclone dust collector 2 are discharged to the fly ash treatment device 4, and meanwhile, fresh slaked lime is supplemented into the slaked lime return system 3 from the slaked lime storage tank 5. When the slaked lime in the system is supplemented sufficiently, the desulfurization is carried outAnd after the efficiency is recovered to be normal, closing a channel from the cyclone dust collector to the fly ash treatment device 4, and switching the particulate matters at the bottom of the cyclone dust collector 2 to be conveyed to the slaked lime feeding back system 3. The acidic flue gas passes through the semi-dry reaction tower 1 and the cyclone dust collector 2 for two-stage deacidification treatment, so that the requirement of discharging acidic substances can be met.

Example 2

Example 2 the structure and operation mode are basically the same as those of example 1, and example 2 is different from example 1 in that the semi-dry type reaction tower 1 comprises a flue gas inlet flue 7, a rotary atomizer 8; the rotary atomizer 8 is arranged at the top end inside the semi-dry reaction tower 1 and is arranged in a reverse direction with the flue gas inlet 7, so that the lime slurry is ensured to fully react with acidic components in the flue gas, and meanwhile, the atomized lime slurry is completely evaporated by utilizing the temperature of the flue gas; the flue gas inlet flue 7 comprises a flue reducer pipe 9 which is arranged at the tail end of the flue gas inlet flue 7, and the sectional area of the outlet end of the flue reducer pipe 9 is larger than that of the inlet end of the flue reducer pipe, so that the sectional area of flue gas at the outlet of the flue gas inlet flue 7 is increased, the mixing effect of the flue gas and lime slurry sprayed by the rotary atomizer 8 is enhanced, and the desulfurization efficiency is increased.

It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a half dry deacidification device of domestic waste incineration flue gas which characterized in that includes:

the semi-dry reaction tower is used for removing acid gas in the flue gas;

the cyclone dust collector is communicated with the semi-dry reaction tower and is used for separating and collecting large-particle solids in the flue gas;

the slaked lime feeding back system is communicated with the ash bucket at the bottom of the cyclone dust collector and is used for collecting large-particle solids in the ash bucket at the bottom of the cyclone dust collector and conveying slaked lime into a flue between the semi-dry reaction tower and the cyclone dust collector;

the fly ash treatment device is respectively communicated with the semi-dry reaction tower and an ash bucket at the bottom of the cyclone dust collector and is used for collecting large granular solids at the bottoms of the semi-dry reaction tower and the cyclone dust collector;

the lime slurry preparation system is communicated with the semi-dry reaction tower and is used for conveying a lime slurry absorbent to the interior of the semi-dry reaction tower;

and the slaked lime storage tank is communicated with the slaked lime return system and is used for conveying a slaked lime absorbent into the slaked lime return system.

2. The semi-dry deacidification device for the incineration flue gas of the household garbage as claimed in claim 1, wherein:

the semi-dry reaction tower comprises a flue gas inlet flue and a rotary atomizer;

the rotary atomizer is arranged at the top end in the reaction tower and is arranged in a reverse direction with the flue gas inlet, so that the lime slurry is ensured to fully react with acidic components in the flue gas, and meanwhile, the temperature of the flue gas is utilized to completely evaporate the atomized lime slurry;

the flue gas inlet flue comprises a flue reducer pipe arranged at the tail end of the flue gas inlet flue, and the sectional area of the outlet end of the flue reducer pipe is larger than that of the inlet end of the flue reducer pipe, so that the sectional area of flue gas at the outlet of the flue gas inlet flue is increased, and the mixing effect of spraying lime slurry by the rotary atomizer is enhanced.