Method for denitrifying waste incineration flue gas by utilizing ammonia in landfill leachate

A technology for landfill leachate and waste incineration, applied in the field of waste incineration flue gas denitrification, can solve problems such as high ammonia nitrogen, and achieve the effects of high denitrification efficiency, lightening burden and cost saving

Active Publication Date: 2020-02-11
BMEI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a method for denitrification of waste incineration flue gas using ammonia in landfill leachate, which can solve the problem of high ammonia nitrogen in landfill leachate, and is applied to SNCR (selective non-catalytic reduction) The denitrification system enables the effective recycling of resources, which is a very potential method in the circular economy industrial park

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  • Method for denitrifying waste incineration flue gas by utilizing ammonia in landfill leachate

Examples

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Embodiment 1

[0033] Example 1: Such as figure 1 As shown, taking a large-scale waste incinerator with a processing capacity of 500t / d as an example, and under normal operation under rated conditions, the flue gas flow at the outlet of the supporting waste heat boiler is about (80000-100000) Nm 3 / h, the temperature is about 190-240℃, and the concentration of nitrogen and oxygen compounds in the flue gas pollutants is about 300-400mg / Nm 3 (NO accounts for 92.5%, NO 2 (Accounting for 7.5%), the calculated denitration rate is 60%, the required 16% concentration of ammonia water is about 126kg / h, and for the domestic garbage with a processing capacity of 500t, the designed landfill leachate volume is generally 250t / d, and the ammonia nitrogen content is about 2000mg / L, the ammonia content collected by the stripping tower is about 20.6kg / h, (ammonia collection rate is 99%) is made into 16% ammonia water about 128kg / h. Therefore, for the landfill leachate with a production volume of 250t / d and an...

Embodiment 2

[0044] Example 2: Such as figure 1 As shown, taking a large-scale waste incinerator with a processing capacity of 500t / d as an example, and under normal operation under rated conditions, the flue gas flow at the outlet of the supporting waste heat boiler is about (80000-100000) Nm 3 / h, the temperature is about 190-240℃, and the concentration of nitrogen and oxygen compounds in the flue gas pollutants is about 300-400mg / Nm 3 (NO accounts for 92.5%, NO 2 (Accounting for 7.5%), theoretically calculated that the denitration rate is 60%, the 16% concentration of ammonia water is about 126kg / h, and for the domestic garbage with a processing capacity of 500t, the designed landfill leachate volume is generally 250t / d, and the ammonia nitrogen content is about 1000mg / L, the ammonia content collected by the stripping tower is about 10.3kg / h, and the ammonia water with a concentration of 16% is about 64.4kg / h, which cannot meet the amount of ammonia water used for flue gas denitration. T...

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Abstract

The invention discloses a method for denitrifying waste incineration flue gas by utilizing ammonia in landfill leachate, and belongs to the technical field of high-concentration ammonia nitrogen treatment of landfill leachate. The method comprises the following steps: pretreated leachate firstly enters an adjusting tank, the pH value of wastewater is adjusted to 10 or above, then the temperature of the wastewater is increased to about 80 DEG C through a heat exchanger, the wastewater is sent into a stripping tower, and water flows downwards from the top of the tower and is in countercurrent contact with high-temperature steam introduced from the bottom of the tower through a filler or a distributor; ammonia-containing steam is discharged from the top of the stripping tower, and goes through a tower top fractional condenser to generate ammonia water; ammonia water with the concentration of 8-16% is finally prepared by controlling the reflux quantity of the ammonia water and the operation temperature of the tower top fractional condenser, and is stored in an ammonia water storage tank; gas-phase ammonia generated by the fractional condenser can be directly blown into a hearth throughthe induced draft fan and undergoes a denitration reaction; and effluent of the stripping tower is subjected to waste heat recovery and neutralization, then enters a leachate post-treatment system, is continuously treated, and is discharged when reaching standards.

Description

Technical field [0001] The invention belongs to the technical field of high-concentration ammonia nitrogen treatment of landfill leachate, and particularly relates to a method for denitrifying waste incineration flue gas by using ammonia in the landfill leachate. Background technique [0002] Landfill leachate is a particularly complex, high-concentration, and difficult-to-treat organic wastewater. In the latest pollution control standard for incineration of domestic waste published in 2014, the discharge standard of waste leachate after treatment has a difference in chemical oxygen demand (COD) and five-day biochemical oxygen demand (BOD). 5 ), ammonia nitrogen, suspended solids and other indicators have made more stringent emission limits. The main treatment process of landfill leachate is pretreatment-main treatment-post treatment. Among them, the pretreatment mostly adopts physical and chemical methods such as coagulation precipitation, ammonia stripping, chemical oxidation,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56C02F9/14C02F103/06C02F101/38
CPCB01D53/56B01D53/78B01D2251/2062B01D2258/0283C02F1/04C02F1/66C02F3/2846C02F9/00C02F2101/38C02F2103/06
Inventor 张帅董少刚李永华张勇商亮亮王迁
Owner BMEI
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