A method for denitrification of waste incineration flue gas by using ammonia in landfill leachate

A technology for landfill leachate and waste incineration, which is applied in the field of denitrification of waste incineration flue gas, can solve problems such as high ammonia nitrogen, and achieve the effects of high denitration efficiency, cost saving, and reduction of inorganic matter content.

Active Publication Date: 2021-11-30
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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  • A method for denitrification of waste incineration flue gas by using ammonia in landfill leachate

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Embodiment 1

[0033] Embodiment 1: as figure 1 As shown, taking a large-scale waste incinerator with a processing capacity of 500t / d as an example, under rated operating conditions, the flue gas flow at the outlet of the waste heat boiler is about (80000-100000) Nm 3 / h, the temperature is about 190-240°C, and the concentration of nitrogen oxides in the flue gas pollutants is about 300-400mg / Nm 3 (NO accounted for 92.5%, NO 2 Accounting for 7.5%), the calculated denitrification rate of 60% required 16% concentration of ammonia water is about 126kg / h, and for domestic waste 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 is about 20.6kg / h through the stripper, and (the ammonia collection rate is 99%) is prepared into about 128kg / h of 16% concentration of ammonia. Therefore, for landfill leachate with a production volume of 250t / d and an ammonia nitrogen content of about 2...

Embodiment 2

[0044] Embodiment 2: as figure 1 As shown, taking a large-scale waste incinerator with a processing capacity of 500t / d as an example, under rated operating conditions, the flue gas flow at the outlet of the waste heat boiler is about (80000-100000) Nm 3 / h, the temperature is about 190-240°C, and the concentration of nitrogen oxides in the flue gas pollutants is about 300-400mg / Nm 3 (NO accounted for 92.5%, NO 2 Accounting for 7.5%), according to theoretical calculation, the denitrification rate of 60% requires about 126kg / h of 16% concentration of ammonia water, and for domestic waste 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 stripper 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 denitrification. Therefore, for landfill leachate ...

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Abstract

The invention discloses a method for denitrating waste incineration flue gas by using ammonia in landfill leachate, which belongs to the technical field of high-concentration ammonia nitrogen treatment of landfill leachate. The pretreated leachate first enters the adjustment tank to adjust the pH of the wastewater to above 10, then raises the temperature of the wastewater to about 80°C through a heat exchanger, and sends it to the stripping tower. The water flows downward from the top of the tower and passes through the packing Or the sparger is in countercurrent contact with the high-temperature steam introduced from the bottom of the tower; the ammonia-containing steam is discharged from the top of the stripping tower, and ammonia water is generated after passing through the top separator; The ammonia water with a concentration of 8%-16% is stored in the ammonia water storage tank; the gaseous ammonia gas generated by the decondenser can be blown directly to the furnace through the induced draft fan for denitrification reaction; the effluent of the stripping tower enters the leachate after waste heat recovery and neutralization The post-treatment system continues to process until the discharge reaches the standard.

Description

technical field [0001] The invention belongs to the technical field of high-concentration ammonia nitrogen treatment of landfill leachate, and in particular relates to a method for denitrating waste incineration flue gas by using ammonia in landfill leachate. Background technique [0002] Landfill leachate is a kind of organic wastewater with complex composition, high concentration and difficult treatment. In the newly published pollution control standard for domestic waste incineration in 2014, the discharge standard of domestic waste leachate treatment has a significant impact on chemical oxygen demand (COD), 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, physical and chemical methods such as coagulation precipitation, ammonia stripping, chemical oxidation, and electroly...

Claims

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Application Information

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Patent Type & Authority Patents(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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