Ammonia Flue Gas Desulfurization
Ammonia FGD
| SO2 absorption efficiency | 99.2% and above |
|---|---|
| Ammonium sulfite oxidation effect | 99.0% and above |
| Ammonia recovery rate | 99% |
| S02 content after desulfurization | <35mg/m3 |
| NOx content after desulfurization | <50mg/Nm3 |
| NH3 content after desulfurization | <3mg/Nm3 |
| aerosol content after desulfurization | <3mg/Nm3 |
| particles content after desulfurization | <5mg/Nm3 |
| PH value | 5.5-6 |
TheTechnology of Mirshine Ammonia Flue GAS Desulfurization
The first reaction occurs when the amount of ammonia is low, the second reaction occurs when the amount of ammonia is high, and the third reaction is the real absorption reaction in ammonia process.The acid salt NH4HSO3 produced in the process of absorption has no ability to absorb SO2. With the process of absorption, the quantity of SO2 in the absorbent solution increases, and the absorption capacity of the absorbent decreases, so it is necessary to replenish ammonia to the absorbent solution.Conversion of NH4HSO3 to (NH4)2SO3 to maintain the absorptive capacity of the absorbent.
The Engineering System of Mirshine Ammonia Flue gas Desulfurization
It is composed of flue gas system, concentration circulation system, absorption circulation system, purifying water washing and removing fog system, ammonia water adding system, oxidizing air system and Ammonium sulfate production and storage system.
The Main Contents are as Follows
1concentration circulation system
The concentration section mainly depends on the reverse contact between the secondary circulating liquid and the flue gas to reduce the flue gas temperature to about 60 ℃. The secondary circulating liquid passes through the heat transfer between the secondary circulating liquid and the high-temperature flue gas, in which the moisture is evaporated, and the circulating liquid is concentrated to produce crystallization. Reflux to the circulating crystallization tank, solid-containing crystallization liquid through the crystallization pump into the ammonium sulfide system.
2Flue gas System
The flue gas from the boiler tangentially enters the concentration section of the desulfurization tower through a certain angle, in full contact with the concentrated circulating liquid, and cools the flue gas temperature to about 60 ℃, enters the upper absorption section of the desulfurization tower, and reacts fully with the absorption circulating liquid. More than 98% of the sulfur dioxide is absorbed. After the water is washed in the purification stage, the flue gas is cleaned and released through the mist remover. There is no ammonia escape in the net flue gas.
3absorption circulation system
The first stage circulating liquid is that the ammonia-ammonium sulfate solution is pushed into the absorption section of the desulfurization tower, which is in full contact with the flue gas to absorb the sulfur dioxide in the flue gas, so that the content of SO2 in the flue gas can meet the national emission target and produce ammonium bisulfite and ammonium sulfite.
4purifying water washing and removing fog system
The function of the water purification system is to capture the ammonia escaped from the absorption section and the aerosol produced, to clean the dust, to do the final purification of the flue gas, and to exhaust the net smoke through the chimney through the double layer mist remover.
5ammonia water adding system
Ammonia water or gas ammonia can be used as absorbent according to the different characteristics of each owner. Ammonia water is added to the ammonia heater before the primary circulating pump and the solution from the desulfurization tower is fully mixed and then enters the absorption section of the desulfurization tower through the pump to participate in the desulphurization reaction. The ammonia escape and the aerosol generation can be reduced by this ammonia addition method.
6oxidizing air system
The bottom of the desulfurization tower is the oxidation section. The high pressure air is supplied by the high pressure Roots fan. A tubular oxidizing air distributor is arranged in the oxidation section, and the circulating liquid of the oxidation section is forced to be oxidized. With reasonable distributor arrangement and sufficient amount of oxidized air, the oxidation efficiency can reach more than 99%.
7Ammonium sulfate production and storage system
The bottom of the desulfurization tower is the oxidation section. The high pressure air is supplied by the high pressure Roots fan. A tubular oxidizing air distributor is arranged in the oxidation section, and the circulating liquid of the oxidation section is forced to be oxidized. With reasonable distributor arrangement and sufficient amount of oxidized air, the oxidation efficiency can reach more than 99%.
The Qualification of Mingsheng Ammonia flue gas desulfurization(FGD)
Ammonia is used as desulphurizer in ammonia desulfurization process with low electricity consumption and low water consumption. The desulphurizer comes from a wide range of sources and has no waste water, waste gas and three wastes. Ammonium sulfate by-product can be used as sulfur-based chemical fertilizer. It is a green and non-pollution-free environmental technology.
| Ammonia FGD | Limestone FGD |
|---|---|
| technic index: | technic index: |
| Flue gas treatment capacity:310000m3/h | Flue gas treatment capacity: 310000m3/h |
| Original SO2 content: 3000 mg/Nm3 | Original SO2 content: 3000 mg/Nm3 |
| Flue gas temperature: 140℃ | Flue gas temperature: 140℃ |
| System pressure drop≤1500Pa | System pressure drop≤1500Pa |
| Annual operating time: 8000h | Annual operating time: 8000h |
| Desulfurizer: liquid ammonia | Desulphurizer: 80% quicklime |
| Net flue gas moisture content ≤50mg/Nm3 | Net flue gas moisture content ≤50mg/Nm3 |
| Net flue gas SO2 content ≤35mg/Nm3 | Net flue gas SO2 content ≤100mg/Nm3 |
| Net flue gas dustiness ≤10mg/Nm3 | Net flue gas dustiness≤10mg/Nm3 |
| Net flue gas NH3 content ≤3mg/Nm3 | |
| Net Flue gas temperature ≥50℃ | Net Flue gas temperature ≥50℃ |
| Sulfur removal efficiency ≥98.8％ | Sulfur removal efficiency ≥96.67％ |
| Ammonia recovery rate ≥99％ | calcium sulfur ratio: 1.03 |
| By product: Ammonium sulfate(line with the industry standard) | By product: gypsum |
The Features of Mirshine Ammonia Flue gas Desulfurization
1.Sufficient absorption, and to prevent aerosol production availably.
2.The relative liquid gas ratio is low, low power consumed.
3.Two stage purification system is adopted, Ammonia escape and aerosol production can be effectively prevented.
4.Automatic interlock control through PH, to control pH value Strictly.
5.Air oxidation distributor with net form, uniform gas distribution, full contaction with liquid circulation, at the same time to improve the oxidation level, at thesame time, the oxidation level is increased, so that the oxidation is complete.
6.Water consumption and steam consumption are reduced by crystallization in the tower.
7.Reasonable calculation of technological indexes, and to use frequency conversion technology to reduce power consumption.
8.DCS system is used to control labor cost.
9.After ammonium sulfate system use a variety of ways to combine, to increase ammonium sulfate output of rate, to ensure long period operation of the system.
10.All domestic famous brand materials are used,to assure project quality, to put an end to erosion and corrosion.
11.Set the timing flush in the easily blocked part, to prevent the obstruction of key parts.