Alkali ash crystallization and filtering system
A soda ash and crystallization technology, which is applied in the purification of alkali metal sulfite/sulfate, etc., can solve the problems of reduced power generation, damage to boiler pressure components, lowering of the adhesion temperature of soda ash, etc., so as to reduce fouling and scaling phenomenon, the effect of avoiding corrosion and damage
Active Publication Date: 2015-12-09
武汉凯比思电力设备有限公司
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Problems solved by technology
When the content of chloride ions and potassium ions is too high, the adhesion temperature of soda ash will be reduced, and the adhesion of soda ash will be increased, resulting in frequent ash deposition and scaling in the soda furnace
Scaling on the pipe wall will reduce the heat transfer coefficient and reduce the power generation. The high chloride ion content in the ash deposit will also accelerate the corrosion of the pipe wall and cause damage to the boiler pressure components.
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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0025] Soda ash is the dust formed by burning the concentrated papermaking black liquor in the alkali recovery furnace. The main component of soda ash is Na 2 SO 4 , soda ash also contains a small amount of NaCl, K 2 SO 4 , KCl. After dissolving soda ash in water, a mixed solution (that is, slurry) is formed. With increasing temperature Na 2 SO 4 , NaCl, K 2 SO 4 , the solubility of KCl is also increasing, but NaCl, K 2 SO 4 1. The crystallization point of KCl is low, so the difference in crystallization point can be used to heat the mixed solution (slurry) to a certain temperat...
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The invention relates to the technical field of alkali recycling equipment and particularly relates to an alkali ash crystallization and filtering system. According to the alkali ash crystallization and filtering system, by utilizing the difference among the crystallization points of an alkali ash main component, namely sodium sulfate, and impurities including sodium chloride, potassium sulfate and potassium chloride, alkali ash is dissolved to form paste and is repeatedly recrystallized to remove the impurities, so that corrosion and damages to equipment by chlorine ions and potassium ions in the impurities are avoided, and ash deposition and scaling phenomena of an alkali recycling furnace are reduced; according to the alkali ash crystallization and filtering system provided by the invention, a washer is arranged under a crystallizer and is used for controlling the granularity of crystals, and advantageous conditions are created for a subsequent separation process.
Description
technical field [0001] The invention relates to the technical field of alkali recovery equipment, in particular to an alkali ash crystallization filtration and washing system. Background technique [0002] During the operation of the alkali recovery boiler, the black liquor continuously enters the furnace for combustion, and the formed alkali ash dust is recycled and utilized. Because the dust contains impurities such as chloride ions and potassium ions, the content of chloride ions and potassium ions in the furnace continues to increase . When the content of chloride ions and potassium ions is too high, the adhesion temperature of soda ash will be reduced, and the adhesion of soda ash will be increased, resulting in frequent ash deposition and scaling in the soda furnace. Scaling on the tube wall will reduce the heat transfer coefficient and reduce the power generation. The high content of chloride ions in the ash will also accelerate the corrosion of the tube wall and cau...
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Inventor 郑皓元高川舒欢宣爱国
Owner 武汉凯比思电力设备有限公司