Special anti-scaling agent for petroleum refinery enterprise boiler and steam pocket and application of special anti-scaling agent

Abstract

The invention discloses a special anti-scaling agent for a petroleum refinery enterprise boiler and a steam pocket and application of the special anti-scaling agent. The special anti-scaling agent consists of organic phosphonic acids, organic carboxylic acid polymers and water, wherein the organic phosphonic acids comprise one or more of 2-phosphonic acid based-1,2,4-tricarboxylic acid butane, ethylene diamine tetra (methylene phosphonic acid) sodium, amino trimethylene phosphonic acid and diethylenetriamine pentamethylene phosphonic acid; the organic carboxylic acid polymers comprise one or more of polyacrylic acid, polymaleic anhydride, polyaspartic acid, polyepoxysuccinic acid, an acrylic acid / hydroxypropyl acrylate copolymer and an acrylic acid-2-acrylamide-2-methyl propanesulfonic acid. By adopting the special anti-scaling agent, inorganic matters can be effectively prevented from scaling within a very large concentration range, formation of free alkalis and water scale sedimentscan be reduced to the maximum extent, the ratio of sodium ions to phosphate can be effectively regulated, and system damage caused by free alkalis can be avoided while scaling is inhibited. The special anti-scaling agent has very good temperature resistance and dispersion properties, and quality of steam can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of scale inhibitors, in particular to a special scale inhibitor for boilers and steam drums in petroleum refining and chemical enterprises and its application. Background technique [0002] In the oil refinery boiler system, water boils and evaporates after being heated in the pot, which provides conditions for chemical reaction and continuous concentration of impurities in the water. When these impurities reach saturation in the pot, solid substances will be precipitated. This solid substance Deposited on the heating surface, it becomes scale. At the same time, the impurities carried in the steam will deposit on the boiler pipes and steam turbine blades under the condition of temperature and pressure changes, resulting in salt accumulation, which will affect the mechanical efficiency and bring great safety to production. Hidden danger. [0003] In recent years, most domestic medium and high pressure boiler...

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Problems solved by technology

[0002] In the oil refinery boiler system, water boils and evaporates after being heated in the pot, which provides conditions for chemical reaction and continuous concentration of impurities in the water. When these impurities reach saturation in the pot, solid substances will be precipitated. This solid substance Deposited on the heating surface, it becomes scale. At the same time, the impurities carried in the steam will deposit on the boiler pipes and steam turbine blades under the condition of temperature and pressure changes, resulting in salt accumulation, which will affect the mechanical efficiency and bring great safety to production. Hidden danger

[0003] In recent years, most domestic medium and high pressure boiler systems use inorganic phosphates as scale inhibitors. Due to the problem of sodium-phosphorus ratio in the use of such inorganic scale inhibitors, it is easy to generate free sodium hydroxide in the boiler system, which will bring great harm to the system. In addition, it is difficult to simply adjust the sodium-phosphorus ratio during use, and it is easy to cause unqualified steam, steam turbine condensate return water, etc. during application, and it is easy to cause salt formation in the steam turbine, which brings risks to the long-term operation of the system

[0004] In some patents, it is mentioned that polymers are used as dispersants, which can play a better dispersing effect, but there are still many defects. They have low tolerance to calcium ions in water and low chelating ability. In the environment of high alkali hardness, it cannot peel off and disperse the existing scale layer, and has poor high temperature resistance

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