The salt in the boiler water is mainly phosphate.
1. Increase the boiling point and play a sterilizing effect. After adding salt, the boiling point can be increased to about 104 degrees and the water temperature will be higher, which can play a sterilizing role and also increase the heating water temperature.
2. Softens hard water and prevents scale formation. Add salt to the boiler feed water so that the Ca2+ entering the furnace with the boiler feed water does not form scale, but generates slag, which will be removed by purging the boiler. Boiler.
3. Prevent alkaline corrosion.
Detailed information:
1. In order to reduce the residual hardness of the boiler feed water, more Ca2+ and Mg2+ must be removed during the proprocess of softening the feed water to avoid the generation of water slag. Excessive boiler water will increase boiler blowdown and even affect steam quality.
2. The specified excess amount of phosphate must be maintained in the boiler water. In addition, the dosage should be uniform and the speed should not be too fast to avoid a sudden increase in the salt content of the boiler water and impair the steam quality.
3. The generated water slag should be discharged in time to prevent a large amount of water slag from accumulating in the boiler water and affecting the steam quality.
4. For scaled boilers, the scale must be removed first during the phosphate dosing treatment. Because phosphate roots can also interact with the originally generated calcium calculus, causing the calculus to gradually transforme slag and its fall, thereby producing a large amount of slag in the boiler water and affecting the steam quality. In severe cases, tartar forms. fallen can even block the oven tube and cause a malfunction of the water circulation.
5. The added medicine should be relatively pure to prevent impurities from mixing in the pot and causing corrosion of the boiler and deterioration of steam quality. The quality of medicines should generally meet the following standards: the content is not less than 92%, and the insoluble residue is not more than 0.5%.
Baidu Encyclopedia - Boiler fresh water
What is the principle of adding salt water and urea to old batteries to produce electricity
(1) Nanomaterials It has strong adsorption capacity and can increase the adsorption area. The battery uses manganese dioxide nanorods as matcathode material to improve the efficiency of energy production, so the answer is: stronger adsorption capacity (or larger surface area);
(2) According to the total reaction of the battery: 5MnO2+2Ag+2NaCL=Na2Mn5O10+2AgCl, the electron-losing metal is silver, and the oxidation reaction of electron loss occurs on the negative electrode of the original battery, so the negative electrode reaction is Ag+Cl- -e-=AgCl↓, when generating 1mol?Na2Mn5O10, 2mol of metallic silver is consumed and 2mol of electrons are transferred, so the answer is: Ag+ Cl--e-=AgCl↓ ;2;
(3) According to the reaction：MnO2+C2O42-+4H+=Mn2++2CO2↑+2H2O, 2MnO4-+5C2O42-+16H+=2Mn2+ +10CO2↑+8H2O, the relationship formula is obtained: 5MnO2--5C2O42---2MnO4-, assuming the mass formula of manganese dioxide n, then
5MnO2 --5C2O42--- 2MnO4-
5 2
n 10×0.02mol?L-1×0.02L
i.e.
| 5 |
| n |
| 2 |
| 10×0.02mol?L?1×0.02L |
| 0.01mol×87g/mol |
| 1.2g |
Answer: The mass fraction of MnO2 in pyrolusite is 72.5%
In fact, it is not possible to produce electricity.
What you added only increased the electrolyte, which means that the internal resistance of the battery is reduced and the conductivity is increased. This old battery seems to have new. power when used, because you feel that the smalllight. The light bulb lights up or the little toy can move again.
The principle of the battery is actually a redox reaction. Electrons are transferred through the graphite rod in the middle (general dry cell), so there is electricity. Salt water and urea do not undergo redox reactions and therefore cannot produce electricity on their own.
For larger batteries, like car batteries, you sometimes go to a service shop to add water or something like that. Actually, it's not water, but sulfuric acid or something.