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First, the control indicators of boiler water:
1. Suspended solids: refers to the content of water-insoluble solid mixtures separated after filtering. (If the suspended solids enter the pot directly, the organic matter in the furnace water will increase, causing the soda to co-rise.) ）
2, the total hardness: usually refers to the total content of calcium, magnesium ions, is an important indicator to prevent boiler fouling. For the boiler, the smaller the hardness in the water, the better, and the control of the feed water hardness can control the scaling rate of the boiler.
3. Total alkalinity: refers to the total content of acid root substances such as carbonate, bicarbonate, and hydroxide contained in each liter of water.
4. PH value: that is, the negative logarithm of the hydrogen ion concentration, which is an indicator of the acidity and alkalinity of the dissolution. The PH value is too low or too high is not conducive to the anti-scaling and anti-corrosion of the boiler. It can be determined by PH test strip, the PH value is < 7, the water is acidic, the PH value = 7, the water is neutral, the PH value is > 7, and the water is alkaline. The PH value of the furnace water should be controlled at 10 to 12.
5. Dissolved solids: refers to the total content of dissolved salts in water, which is usually used to indicate the concentration of pot water and is used to guide the amount of sewage discharged from the boiler.
6. Relative alkalinity: refers to the ratio of the content of free sodium hydroxide present in the furnace water to the total content of dissolved solids in the furnace water. (Too large can cause corrosion, causing fine cracks in the steel.) ）
7, oil content: refers to the content of grease per liter of water, a large amount of grease will cause soda to co-rise.
8, dissolved oxygen: refers to the content of dissolved oxygen per liter of water, which will cause oxidative corrosion of the boiler, and should be deoxygenated.
Second, the outside of the furnace water treatment and sodium ion exchanger:
1. The main content of industrial boiler water treatment is the softening of water, that is, the removal of calcium and magnesium ions in the water through ion exchange treatment to prevent boiler fouling.
2, the working principle of the sodium ion exchanger: raw water with a thick tube to the top of the exchanger distribution funnel, from which the spray is evenly softened through the exchange layer, soft water in the bottom of the exchanger after collection and discharged. When passing through the sodium ion exchange layer, the cations such as calcium and magnesium in the water are exchanged with the sodium ions in the exchanger to soften the water. With the continuous exchange process, after the sodium ions in the exchanger are replaced by most or all of them, the effluent contains cations such as calcium and magnesium (hardness appears), and when the hardness reaches a certain value (does not meet the standard of boiler feed water), it means that the ion exchanger fails and needs to be regenerated. Therefore, the regeneration process is to make the sodium chloride solution containing a large number of sodium ions pass through the failed exchanger layer, and the calcium and magnesium ions contained in the ion exchanger are discharged, and the sodium ions are adsorbed by the exchanger, so that the exchanger can regain its exchange capacity.
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