Working principle of boiler desulphurization and dust collector:
Ammonia desulfurization, is to control the sulfur dioxide emissions of technology, dust catcher can not only remove the flue gas sulfur dioxide, and can produce high value of ammonia sulfate fertilizer products. The boiler dust removal equipment using a certain concentration (here to 28% as an example) of ammonia as a desulfurization agent, the production of ammonia sulfate slurry, transported to the fertilizer plant treatment system. Ammonia process for the use of ammonia required, by the preset PH control valve to automatically adjust, and by the flowmeter for measurement. Ammonium sulfate crystal in the desulfurization and dust catcher in the saturated ammonium sulfate slurry crystal, to generate 35% weight ratio of suspended particles. The slurry pump to the quilt after primary treatment field, and two levels of dehydration, then, and then sent to the fertilizer plant for further dewatering, drying, condensation and storage, at the same time through the boiler dust removal equipment for flue gas desulfurization, boiler dust collector also generates a by-product of considerable economic benefits, to achieve a certain.
Reaction principle of boiler desulphurization and dust collector:
1, reaction equation
Desulfurization tower is an intermediate device for flue gas desulfurization and production of ammonia sulfate. SO2 in the flue gas desulfurization tower was removed, the pH value of the desulfurization tower is controlled by the 5.05.9 saturated sulfuric acid ammonia / ammonium sulfite solution, and SO2 reaction, according to the following reaction to produce hydrogen sulfite / hydrogen sulfate:
1) H2OH2SO3 SO2+
H2SO3+ (2) SO4NH4HSO4+ (NH4) 2 NH4HSO3
H2SO3+ (3) S (NH4) 2 O32NH4HSO3
In the reaction (1), the solution of the flue gas in the water is produced in the water. In the reaction (2) and (3), ammonium sulphate / sulfite and the dissolved sulfite. Ammonia injection to the bottom of the reaction tank, in accordance with the following ways and acidic:
4) NH3NH4SO3 H2SO3+
5) NH3NH4HSO4+ NH4HSO3 NH4HSO3+
(6) NH3 H2SO3+ (NH4) 2 SO4
Jet to air oxidation at the bottom of the desulfurizing tower, will be as follows: will sulfite oxidation to sulfate (NH4) 2 SO3+1/2 O2 (NH4) 2 SO4
At this point, a large number of ammonium sulfate is generated in the desulfurization tower of the boiler desulfurization dust catcher. After the sulfuric acid is saturated by the solution, the ammonium sulfate is precipitated from the solution by the crystal shape.
Vaporization heat is provided by the residual heat of the flue gas as follows:
(NH4) 2 SO4 (liquid) + heat of vaporization > (NH4) 2 SO4 (solid) salt of the desulfurization tower either in ionic form in solution, or to precipitate out of the crystalline shape. Ammonia sulfate salt composition, slurry and system products are combined together in the crystallization of the fully oxidized.
Operation process of desulfurization equipment:
Flue gas running path of boiler desulfurization dust collector: flue gas from the existing electrostatic precipitator and blower through the flue system; through a 100% axial flow turbo fan, into the desulfurization tower. The flue gas enters the desulfurization tower, and contains ammonia slurry spraying the countercurrent contact SO2 by ammonia absorption slurry. At the same time, the slurry gas saturation, and from the entrance of the cooling temperature of 135 DEG C to 50 DEG C, then the gas passes through the top of the desulfurization tower two corrugated type demister, two layer efficient except for upper demister mounted on the desulfurization tower, in order to remove (gas) droplets attached. Gas in the spray tower, leaving the desulfurization tower, once again through the boiler, to re heating gas, and to 80 degrees Celsius temperature, according to the design of the operating conditions into the existing chimney device.
The liquid desulfurization tower boiler desulfurization precipitator path: desulfurization tower of serous fluid in the pH value in the range of 5.05.9, the pH value of the optimal removal efficiency and ammonia sulfite oxidation rate of SO2. Ammonium sulfate is easy to dissolve, and under the conventional conditions, the solubility of up to 40% weight can be reached, and the ratio is 48.5%. Control of suspended particles with 3-5% weight in the desulfurization tower is in operation. The slurry pump will be sent to the first stage cyclone. The overflow slurry of the cyclone is sent back to the desulfurization tower, and the lower part of the cyclone is fed into a cyclone storage tank with a concentration of 1317% weight concentration. A slurry pump will be sent to the concentration of the tank in the fertilizer plant to the second stage of the cyclone to do further dewatering. A fertilizer plant in filtrate return pump will be diluted liquid centrifuge out to the desulfurization tower.
Reaction agent supply system of boiler desulfurization dust remover: ammonia water reaction agent supply system comprises 7 days storage storage tank and conveying pump. 28% concentration of ammonia water through the bottom of the desulfurization tower oxidation with air and cooling water mixed with the mixture into the desulfurization tower. A predetermined pH value of the control valve to control the flow of ammonia.
Boiler desulfurization precipitator application conditions: ammonia desulfurization of boiler dust and pesticides not only harm to benefit, also can produce products useful to humans, the boiler dust removal equipment damage land, crop farmers farming fertilizer into acid rain. Ammonia desulfurization process is similar to the common limestone gypsum process, but the resulting by-product is not the same