Salt inhibitor, and method for deacidifying incineration flue gas by using same

A salt-resistance and deacidification technology, which is applied in the field of saline wastewater treatment in the incineration system, can solve problems that affect the stable production of the process

Active Publication Date: 2021-12-03
南京广全环保技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method to improve the effect of dry deacidification, reduce operating costs, and solve the problem of high-salt wastewater sprayed into the quench tower to accumulate salt and affect the stable production of the process.

Method used

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  • Salt inhibitor, and method for deacidifying incineration flue gas by using same
  • Salt inhibitor, and method for deacidifying incineration flue gas by using same
  • Salt inhibitor, and method for deacidifying incineration flue gas by using same

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A method for deacidifying incineration flue gas and realizing zero discharge of sewage, comprising the steps of:

[0048] After the high-temperature flue gas enters the quenching tower, the temperature suddenly drops below 200°C under the action of water or brine. Discharge after the dust collector.

[0049] Described incineration flue gas comprises the steps:

[0050] 1) When the high-temperature flue gas has no waste heat boiler, the cooling tower is used to cool the flue gas to above 500°C;

[0051] 2) The flue gas is rapidly cooled to below 200°C;

[0052] 3) The air grinder grinds the baking soda;

[0053] 4) Baking soda dry deacidification;

[0054] 5) Activated carbon adsorption;

[0055] 6) Filter dust removal;

[0056] 7) Step 4)-Step 6) are combined into one stage or used repeatedly to form multistage dry deacidification.

[0057] The rapid cooling of the flue gas in the step 2) adopts a downstream spray tower, and the high-temperature flue gas enters fro...

Embodiment 2

[0059] A method for deacidifying incineration flue gas and realizing zero discharge of sewage, comprising the steps of:

[0060] After the high-temperature flue gas enters the quench tower, the temperature suddenly drops below 200°C under the action of water or salt water. At this time, the ground sodium bicarbonate is sprayed in time for deacidification. When the high-salt wastewater is produced by deacidification method, and it is difficult to discharge the high-salt wastewater into the sewage treatment plant and the environment, a salt inhibitor is added to the high-salt wastewater, and after mixing evenly, the uniformly mixed high-salt wastewater is sprayed back into the Quenching tower.

[0061] Described incineration flue gas comprises the steps:

[0062] 1) When the high-temperature flue gas has no waste heat boiler, the cooling tower is used to cool the flue gas to above 500°C;

[0063] 2) The flue gas is rapidly cooled to below 200°C;

[0064] 3) The air grinder gr...

Embodiment 3

[0081] A method for deacidifying incineration flue gas and realizing zero discharge of sewage, comprising the steps of:

[0082] After the high-temperature flue gas enters the quenching tower, the temperature suddenly drops below 200°C under the action of water or salt water, and when the high-salt wastewater is difficult to discharge into the sewage treatment plant and the environment, a salt inhibitor is added to the high-salt wastewater and mixed After uniformity, the homogeneously mixed high-salt wastewater is sprayed back into the quenching tower, and at this time, the ground sodium bicarbonate is sprayed in time for deacidification.

[0083] Described incineration flue gas comprises the steps:

[0084] 1) When the high-temperature flue gas has no waste heat boiler, the cooling tower is used to cool the flue gas to above 500°C;

[0085] 2) The flue gas is rapidly cooled to below 200°C;

[0086] 3) The air grinder grinds the baking soda;

[0087] 4) Baking soda dry deac...

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Abstract

The invention discloses a salt inhibitor, and a method for deacidifying incineration flue gas by using the same. The method comprises the following steps: after high-temperature flue gas enters a quench tower, the temperature of the high-temperature flue gas is suddenly reduced to 200 DEG C or below under the action of water or salt-containing water, at the moment, ground baking soda is sprayed in time for deacidification, and salt-containing wastewater or other wastewater subjected to wet-process deacidification is sprayed back into the quench tower. The flue gas dry-process deacidification adopts baking soda to replace slaked lime, so that the deacidification efficiency is improved, and the operation cost is reduced; and when the flue gas contains much acid, wet-process deacidification is performed, and by introducing the salt inhibitor, the problems that high-salt wastewater is sprayed into the quench tower to cause salt accumulation and influence on stable production are solved, and zero discharge of sewage of an incineration system is realized.

Description

technical field [0001] The invention relates to the technical field of disposal of saline wastewater in an incineration system, in particular to a method for deacidifying incineration flue gas and realizing zero discharge of sewage. Background technique [0002] A large amount of flue gas is produced in the process of material incineration, and the flue gas contains acid elements such as halogen and sulfur. In order to make the flue gas emission meet the standard, this method is compared with the previously commonly used slaked lime (also known as slaked lime Ca(OH)2) as a dry method. Deacidification + wet deacidification (sodium hydroxide or sodium carbonate dissolved in water) improves the deacidification efficiency and greatly reduces the discharge of deacidification wastewater. [0003] When salty wastewater is sprayed into the quench tower, the salt will adhere to the inner wall, bottom and flue gas outlet of the quench tower. As a result, the internal flow field of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58B01D53/83B01D53/75B01D53/40B01D53/04B01D50/00F23J15/08F23J15/02F23J15/04C02F103/18
CPCB01D53/75B01D53/40C02F2103/18B01D2258/0283C02F1/58B01D53/83B01D53/04F23J15/08F23J15/02F23J15/04B01D2251/404Y02E20/30
Inventor 许亮胡新民
Owner 南京广全环保技术服务有限公司
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