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Coke Oven High-Ammonia Nitrogen Residual Ammonia Stripping and Concentration Process
Current Situation and Issues: Currently, most coking enterprises in China use the traditional ammonia distillation process to produce only about 10% ammonia water, and the large total volume of this approximately 10% concentration ammonia water leads to significant amounts of desulfurization waste liquid in the subsequent sulfur removal stage.
Solution: Residual ammonia-to-20% or Higher Concentrated Ammonia Solution Process Package + Main Equipment Supply Model (Main equipment includes: reboiler + acid-removal ammonia distillation column + ammonia separator condenser + ammonia condensing cooler)
Advantages: Producing concentrated ammonia water at ≥20% reduces the total ammonia volume by approximately 60% compared to conventional 10% ammonia solutions. This significant reduction in ammonia usage during the desulfurization process not only replenishes ammonia in the desulfurization system but also effectively addresses the issue of liquid expansion in the desulfurization solution. As a result, this technology simultaneously resolves environmental concerns and dramatically lowers the production and operational costs associated with treating desulfurization waste liquids.
| Basic data for the conventional coal coking ammonia stripping process: | A coking enterprise's on-site facility for producing 20% concentrated ammonia water for steam stripping |
| System Material Name: Residual ammonia water, ammonia stripping wastewater, concentrated ammonia gas, and concentrated ammonia water. Public Utility Material Name: Low-pressure steam, circulating water, chilled water Performance Guarantee: The wastewater at the bottom of the tower contains a total ammonia content of ≤150 mg/L, and the resulting ammonium hydroxide solution has a concentration of ≥20%. Process Flow : The remaining raw ammonia water, after being decomposed and fixed with alkali to form ammonium salts, is pumped into the ammonia stripping tower. A small portion (approximately 25%–30% of the feed ammonia water) is fed directly into the top section of the tower, while the remaining part is preheated by exchanging heat with the qualified wastewater at the bottom of the tower before entering the middle section of the tower (just below the packing layer in the top acid-removal zone). This process leverages the partial pressure of volatile components in the residual ammonia water, enabling the top of the tower to achieve a high concentration of acidic components. The ammonia vapor drawn off from the side line is then cooled and condensed into ammonia water of acceptable concentration after passing through a condenser controlled by a fractionation cooler. Meanwhile, the bottom of the tower is indirectly heated using low-pressure steam, ensuring that the NH3 content in the wastewater discharged from the bottom meets the required standards. |
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Deacidification and Ammonia Removal Tower Shipped |
A脱酸蒸氨装置 at a project in Shanxi | |
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Typical Performance Table of Ammonia Stripping System Equipment Over the Past Three Years
Serial Number |
Device Name |
Ammonia Stripping Tower Specifications |
Quantity |
Material |
User Name |
Time |
Note |
1 |
Ammonia distillation equipment |
DN1800 H=23,700 |
2 sets |
S30408/S31603/TA2 |
Fujian Sangang Mingguang Co., Ltd. |
2021 |
Steam-stripping ammonia distillation |
2 |
Ammonia distillation equipment |
DN1800/2000 H=28931 |
2 sets |
S30408/S31603/TA2 |
Xinjiang Da'an Energy Co., Ltd. |
2021 |
Deacidification and ammonia distillation to produce 20% ammonia solution |
3 |
Ammonia distillation equipment |
DN1000/2000 |
2 sets |
S30408/S31603/TA2 |
Indonesia Dexin Steel's Phase II Coking Project |
2021 |
Deacidification and ammonia distillation to produce 20% ammonia solution |
4 |
Ammonia distillation equipment |
DN2000 / H=23,700 |
2 sets |
S30408/S31603/TA2 |
Inner Mongolia Hengkun Chemical Phase II Coking |
2021 |
Steam-stripping ammonia distillation |
5 |
Ammonia distillation equipment |
DN1600 H=27600 |
2 sets |
S30408/S31603/TA2 |
Hubei Youke Premium Steel Coking Project |
2021 |
Deacidification and ammonia distillation to produce 20% ammonia solution |
6 |
Ammonia distillation equipment |
DN2000 / H=23,700 |
2 sets |
S30408/S31603/TA2 |
Liansteel's 4.3-meter Coke Oven Environmental Upgrade and Transformation |
2022 |
Steam-stripping ammonia distillation |
7 |
Ammonia distillation equipment |
DN3100 H=22680 |
2 sets |
S30408/S31603/TA2 |
Turkey's EDMERI Steel Coking Project |
2022 |
Deacidification and ammonia distillation to produce 20% ammonia solution |
8 |
Ammonia distillation equipment |
DN2000 / DN1200 H = 31,000 |
2 sets |
S30408/S31603/TA2 |
Shanxi Mingguang New Energy Technology |
2022 |
Deacidification and ammonia distillation to produce 20% ammonia solution |
9 |
Ammonia distillation equipment |
DN1800/1000 |
2 sets |
S30408/S31603/TA2 |
Guizhou Qixing Coking Co., Ltd. |
2022 |
Deacidification and ammonia distillation to produce 20% ammonia solution |
10 |
Ammonia distillation equipment |
DN2400 H=27798 |
2 sets |
S30408/S31603/TA2 |
Inner Mongolia Junzheng Chemical |
2023 |
Steam-stripping ammonia distillation |
11 |
Ammonia distillation equipment |
DN2200 H=30098 |
2 sets |
S30408/S31603/TA2 |
Guizhou Meijinhuayu Phase I Coking Plant |
2023 |
Steam-stripping ammonia distillation |
12 |
Ammonia distillation equipment |
DN2200 H=30098 |
2 sets |
S30408/S31603/TA2 |
Guizhou Meijinhuayu Phase II Coking Plant |
2023 |
Steam-stripping ammonia distillation |
13 |
Ammonia distillation equipment |
DN2200 / DN1200 H = 31,000 |
2 sets |
S30408/S31603/TA2 |
Lingyuan Steel Coking |
2023 |
Deacidification and ammonia distillation to produce 20% ammonia solution |
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