Method for reusing desulfurization and denitration by-products
A by-product, denitration technology, applied in chemical instruments and methods, preparation of alkali metal sulfites, ammonia compounds, etc., can solve the pollution of boiler exhaust emissions, reduce the use of non-renewable resources, sulfate and sulfite problems such as low impurity content, to achieve the effect of obvious social and environmental benefits, significant economic benefits, and increased benefits
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Embodiment 1
[0031] Example 1: According to the present invention, SO is directly generated 2 and ammonium sulfate
[0032] Reaction principle: (NH 4 ) 2 SO 3 +H 2 SO 4 ==(NH 4 ) 2 SO 4 +H 2 O+SO 2 ↑
[0033] When ammonia water is used to absorb sulfur oxides and nitrogen oxides produced in the coal combustion process, stop feeding oxygen, then concentrate the main product of ammonium sulfite slurry in the circulation tank, and slowly feed concentrated sulfuric acid until no gas is generated. The produced gas SO 2 Then it is absorbed by water, and then a second-stage exhaust gas absorption device is added later. The first-stage exhaust gas can be recycled to the upper-stage SO 2 Absorption tank, adding starch I to the second-stage exhaust gas absorption device 2 The solution is used to monitor the degree of (absorption) reaction in the previous stage, and finally the concentration of sulfurous acid formed by the reaction in the solution is determined by iodometric method. T...
Embodiment 2
[0034] Example 2 : directly generate sodium sulfite and ammonium sulfate according to the present invention
[0035] Reaction principle: (NH 4 ) 2 SO 3 +H 2 SO 4 ==(NH 4 ) 2 SO 4 +H 2 O+SO 2 ↑
[0036] SO 2 +2NaOH=Na 2 SO 3 +H 2 o
[0037] Generate SO 2 The method is with embodiment 1, and soda ash is made into the lye of certain concentration, reacts with sulfur dioxide gas and obtains sodium sulfite solution. The sodium sulfite solution enters the concentrator, and a double-effect continuous concentration process is adopted. The water was distilled off to obtain a suspension containing crystals of sodium sulfite. Put the qualified material of the concentrator into the centrifuge to realize solid-liquid separation, and the solid (wet sodium sulfite) enters the airflow dryer, and is dried by hot air to obtain the finished product. The mother liquor is returned to the alkali distribution tank for recycling. The ammonium sulfate mother liquor that generates ...
Embodiment 3
[0038] Example 3 : directly generate calcium sulfite and ammonium sulfate according to the present invention
[0039] Reaction principle: (NH 4 ) 2 SO 3 +H 2 SO 4 ==(NH 4 ) 2 SO 4 +H 2 O+SO 2 ↑
[0040] SO 2 +Ca(OH) 2 =CaSO 3 +H 2 o
[0041] Calcium sulfite (CaSO 3 ) is a kind of sulfite, which is used to make calcium-plastic materials, and is also used as a bleaching and dechlorinating agent for cellulose products, a food preservative, and a fermentation bactericide, etc. It has a wide range of uses in industrial production. Generate SO 2 The method is with embodiment 1, calcium hydroxide is made into the lye of certain concentration, reacts with sulfur dioxide gas and obtains calcium sulfite solution. Other processes are similar to the production of sodium sulfite.
[0042] The products such as sulfurous acid, sulfite and ammonium sulfate produced by the invention have high purity and less impurity content, and have remarkable economic and social benefits...
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