Washing liquid for fighting sediments and prolongation of service term of heating system pipelines (versions)

FIELD: chemistry.

SUBSTANCE: claimed washing liquids for heating systems contain either solution of 1-3% citric acid, 0.03-0.05 wt % of hydrochloric acid and 0.05-0.5 wt % of chitosan, modified with isobutyric acid, containing methylpyrazole group (chitosan methyl pyrazolyl isobutyrate - CMPI), or 1-3 wt % of citric acid, 0.1-0.15 wt % of sulfuric acid and 0.05-0.05 wt % of chitosan, modified with isobutyric acid, containing methylpyrazole group (chitosan methyl pyrazolyl isobutyrate - CMPI), water - the remaining part.

EFFECT: effective purification of pipelines, prolongation of service term of heating systems and protection of steel pipelines against corrosion.

2 cl

 

The invention relates to the problem of removal of corrosion products and all types of deposits in the piping and heat exchange equipment housing with the use of water recycling systems and can be used in petrochemical, chemical, metallurgical, and industrial power.

The main factor reducing the efficiency of heat supply systems are the deposits of corrosion products and insoluble salts formed on the heat exchanger and pipe surfaces heating systems that affect heat transfer and hydraulic resistance of the system. One of the reasons for deposits is the use of a coolant that does not conform to the rules of technical operation. As shown by sample analyses, sediments are mainly of two types: 1) a mixture of oxides and hydroxides of iron (the main component is magnetite) and 2) the carbonates of divalent metals. Dominated the first type of sediment, the formation of which is facilitated by the presence of dissolved oxygen in the water. Depending on conditions, the main corrosion products of iron are magnetite (Fe3O4or FeO.Fe2O3), hematite (α-Fe2O3), wustite (FeO), goethite (α-FeOOH or Fe2O3.H2O), ferrihydrite (FeOOH.0,4H2O). The second type pending the th most typical for companies, use in heating systems as coolant water with a higher degree of mineralization, mainly coming directly from natural water sources, for which technological feasibility or other reasons make it impossible or impractical the use of deep cleaning by traditional methods. The extended period of operation, and the heating system is calculated on the service life of 25-30 years, leads to a decrease in the efficiency of heat transfer, increase the hydraulic resistance of the system, which leads to additional costs for the transportation of fluid, increased early corrosion of the metal.

Known washing fluid to combat deposits and extend the service life of pipeline heating systems containing zinc complex oxyethylenenitrilo acid (HEDP), maleic acid, polyethylene glycol (PEG-300) and sodium nitrite at the following mass ratio of the components: OEDF - 15-65, Maleic acid - 2-15, PEG-300 - 1-9, NaNO2- 0,5-1 (RF patent No. 2152576, publ. 10.07.2000).

The processing pipeline heating systems this washing liquid is carried out in two stages. In the first stage, the concentration of the composition in water ask 50-100 mg/l depending on the number of deposits. Treatment of this water is made within 40 days. Thus dostigaet the reduction of deposits on 85-98 Rel.%. In the second stage, the concentration of the composition in water is 5-7 mg/l and maintained for 1 year.

The disadvantage of this technical solution are of low efficiency and cycle time pipeline cleaning, inapplicability for open heating systems, in which the coolant is supplied to the hot water supply system, as well as corrosion of metal pipes.

Known composition of the drilling fluid containing 15-99 (preferably 75-95) wt.% methanesulfonate (MSA), 0.075-3 wt.% from anti-corrosion agent corresponding 4-[(2-ethyl)amino]-4-occaisionally acid; 0.1 to 5 wt%. chelating agent and/or (d) 0.1 to 10 wt.% non-ionic, anionic surfactants. The process of cleaning the pipes with the use of this drilling fluid provides the output of the pipeline is included acting within 1-2 days, the introduction of drilling fluid into the pipe, passage, repeatedly if necessary, scrape the inside of the pipe and the removal of traces of drilling fluid from the pipe (French Patent No. 2955332, publ. 2011.07.22).

The disadvantage of this technical solution are low cleaning efficiency of the pipelines, the need for mechanical cleaning.

Closest to the proposed technical solution is the flush fluid to the domestic water supply, providing the surface is the increased solubility of iron oxides and zinc oxides and sterilization. The washing liquid inside the supply pipe contains 5-10 wt.% citric acid, 1-10 wt.% oxalic acid, 1-10 wt.% malic acid, 0.1-1 wt.% phosphoric acid, 5-15 wt.% hydrochloric acid, 1-2 wt.% hydrogen peroxide and 0.01 to 0.1 wt.% of ascorbic acid. The solution is prepared by mixing the components with water at room temperature to a total weight of 100 wt.% (see Korea patent No. 100808373, publ. 2008.02.27).

However, this solution represents a complex composition, unstable and destructive effect on the metal of the pipeline.

Common drawbacks of these solutions are increased requirements for disposal of waste reagent, frequent frequency of treatment, longer wash cycle, safety requirements when handling chemicals.

The technical problem solved by the invention is the creation of environmentally safe bactericidal washing liquid pipeline heating systems containing a small number of available components that provide effective cleaning of pipelines, extending the service life of heating systems and the corrosion protection of steel pipelines in operation and corrosion protection the wash liquid, creating a hydrophobic protective film on the inner surface of the pipe, with the expansion of the formation of new sediment and reducing the hydraulic resistance.

To solve this technical problem is offered circulating fluid for heating systems, or solution containing 1-3 wt.% citric acid, 0.03-0.05 wt.% hydrochloric acid and 0.05-0.5 wt.% chitosan, a modified somaclonal acid containing methylpyrazolo group (methylpropylsulfonic chitosan - HEI), or 1-3 wt.% citric acid, 0.1-0.15 wt.% a solution of sulfuric acid and 0.05-0.5 wt.% chitosan, a modified somaclonal acid containing methylpyrazolo group (methylpropylsulfonic chitosan - HMPY).

To obtain the ready to use wash fluid HMPI dissolved in appropriate acid mixtures and prepare a water solution at a concentration of 0.1 wt.%. Wash solution operates at a temperature of 60°C.

An example of using the proposed composition of drilling fluids for heating systems.

To obtain 100 ml of working wash liquid in 80 ml of water was dissolved 1 g of citric acid was added to 100 μl of 34% hydrochloric acid, and then 10 ml of 1% aqueous solution of chitosan methylpropanesulfonate (HMI) and brought the volume of solution to 100 ml with water.

Cut steel pipes, made of steel 3, from the inside of the heating system, Vorkuta, containing 90% iron oxide (calculated as Fe2O3), 2% of silicon oxide and less than 1% calcium carbonate filled made the Noah working the washing liquid and the inside of the tube was stirred solution of 2.5 hours at 60°C. Was filtered and the solution so obtained and determined the concentration of dissolved iron. More than 50% of the sediment was dissolved.

Identical section of pipe, fully cleaned, degreased and weighed to 0.1 mg and placed in a working washing liquid, after 2.5 hours of aging at 60°C pipe section is removed from the washing liquid, washed, dried and re-weighed. The corrosion rate was 0.3 μm/hour.

When placing the same length of pipe, fully cleaned and skimmed placed in a solution containing 80 ml of 1 g of citric acid and 100 µl of 34% hydrochloric acid and brought water to 100 ml (without adding chitosan methylpropanesulfonate (HMPI)), after 2.5 hours of aging at 60°C the corrosion rate was 2 μm/hour.

Use the other option of washing liquid containing sulfuric acid, yields similar results.

We offer options of washing fluid to combat deposits and extend the service life of pipeline heating systems have a bactericidal action, contain small amounts of available components, environmentally safe and provide effective cleaning of pipelines, create a hydrophobic protective film on the inner surface of the pipe, preventing obrazovaniyami deposits, reduce the hydraulic resistance, which prolongs the service life of heating systems and protects against corrosion of steel pipelines in operation from corrosion and the washing liquid in the washing process.

1. The flush fluid for heating systems containing citric and hydrochloric acid, characterized in that it contains a solution of 1-3 wt.% citric acid, 0.03-0.05 wt.% hydrochloric acid and 0.05-0.5 wt.% chitosan, a modified somaclonal acid containing methylpyrazolo group (methylpropylsulfonic chitosan - HEI), the rest is water.

2. The flush fluid for heating systems, containing citric acid, characterized in that it contains 1-3 wt.% citric acid, 0.1-0.15 wt.% a solution of sulfuric acid and 0.05-0.5 wt.% chitosan, a modified somaclonal acid containing methylpyrazolo group (methylpropylsulfonic chitosan - HEI), the rest water.



 

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13 cl, 2 tbl, 1 ex

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18 cl, 4 tbl, 8 ex, 10 dwg

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1 ex, 2 tbl

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2 tbl

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2 tbl, 4 ex

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5 cl, 1 tbl, 1 ex

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