Scale inhibitor for boiler and water supply pipeline

A technology for water supply pipeline and scale inhibitor, which is applied in the field of scale inhibitor and boiler scale inhibitor, can solve the problems of weakening the scaling ability of water supply pipeline, restricting the scope of application of scale inhibitor, etc. Excellent effect of biodegradation and scale inhibition

Active Publication Date: 2015-06-10
QINYANG QINGQUAN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, at present, when the boiler water hardness is less than 4mmol / L, the existing antiscalants can basically satisfy the operation of no scale or microscale on the high temperature heating surface of the boiler body and weaken the scaling ability of the water supply pipeline; when the water hardness is greater than 4mmol / L, it cannot play a role, restricting the scope of application of these antiscalants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The scale inhibitor used for boilers and water supply pipelines of the present invention, the scale inhibitor is prepared by the following method:

[0032] a. First mix 10kg of starch, 10kg of sodium humate and 10kg of sodium lignosulfonate, and mix them uniformly to prepare 30kg of material A;

[0033] B, 3kg of polymaleic anhydride and 6kg of aminotrimethylene phosphonic acid are mixed, and after mixing evenly, 9kg of B liquid is prepared;

[0034] c. Dissolve 30kg of the A material obtained in step a in pure water to prepare an aqueous solution with a mass content of 30%. The resulting aqueous solution is heated to 55°C, and then 3kg of hydrogen peroxide with a mass percentage of 27.5% is added dropwise for 0.5 h; after the dropwise addition is completed, react at 55°C for 1.5h;

[0035] d, after the reaction finishes, dropwise add 9kg of B liquid that step b obtains in the gained reaction solution, constantly measure the pH value of reaction solution in the droppin...

Embodiment 2

[0038] The scale inhibitor used for boilers and water supply pipelines of the present invention, the scale inhibitor is prepared by the following method:

[0039] a. First mix 11.8kg of starch, 16.6kg of sodium humate and 16.6kg of sodium lignosulfonate, and prepare 45kg of A material after mixing evenly;

[0040] b. Mix 10kg of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer with 17kg of diethylenetriamine pentamethylene phosphoric acid, and mix it uniformly to prepare 27kg of B liquid;

[0041] c. Dissolve 45kg of material A obtained in step a in pure water to prepare an aqueous solution with a mass content of 45%, heat the resulting aqueous solution to 60°C, and then add 10kg of hydrogen peroxide with a mass percentage of 27.5% for 1 hour. ; After the dropwise addition, react at 60°C for 1.2h;

[0042] d, after the reaction finishes, dropwise add 27kg of the B liquid that step b obtains in the gained reaction solution, constantly measure the pH value of the ...

Embodiment 3

[0045] The scale inhibitor used for boilers and water supply pipelines of the present invention, the scale inhibitor is prepared by the following method:

[0046] a. First mix 10kg of starch, 20kg of sodium humate and 10kg of sodium lignosulfonate, and mix them uniformly to make 40kg of material A;

[0047] b. Mix 6 kg of acrylic acid-hydroxypropyl acrylate copolymer with 3 kg of aminotrimethylene phosphonic acid and 3 kg of ethylenediamine tetramethylene phosphonic acid, and mix them uniformly to prepare 12 kg of B liquid;

[0048] c. Dissolve 40kg of the A material obtained in step a in pure water to prepare an aqueous solution with a mass content of 40%. The resulting aqueous solution is heated to 65°C, and then 6kg of hydrogen peroxide with a mass percentage of 27.5% is added dropwise, and the dropping time is 0.8 h; after the dropwise addition is completed, react at 65° C. for 1 h;

[0049] d, after the reaction finishes, dropwise add 12kg of the B liquid that step b obt...

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Abstract

The invention discloses a scale inhibitor for a boiler and a water supply pipeline. The scale inhibitor is prepared by the following steps: firstly, mixing starch, sodium humate and sodium lignin sulfonate evenly to obtain material A; mixing an organic carboxylic acid polymer with an organic phosphonic acid evenly, and preparing liquid B; dissolving the material A into pure water to prepare a water solution; dropwise adding hydrogen peroxide, and then reacting; dropwise adding the liquid B to the obtained reaction liquid dropwise adding a caustic soda solution to control the pH value, and then carrying out heating reaction; reacting and cooling to a room temperature, thus obtaining a product liquid scale inhibitor; and mixing the scale inhibitor with sodium carbonate or sodium carbonate and caustic soda evenly when in use. According to the scale inhibitor disclosed by the invention, high-temperature adsorption capacity and dispersion force of starch, sodium humate and sodium lignin sulfonate are improved through chemical modification; and the scale inhibitor has temperature tolerance and hardness resistance. When the scale inhibitor enters a high-temperature zone of a boiler body, the scale inhibiting performance for scale forming matters is relatively high; a water supply system of the boiler is prevented from being scaled; the scale inhibiting performance of a high-temperature system of the boiler is improved; and a strong guarantee is provided for safe operation of the boiler.

Description

technical field [0001] The invention belongs to the technical field of scale inhibitors for boilers, and in particular relates to a scale inhibitor suitable for high-hardness water and preventing scaling of boilers and low-temperature water supply pipelines. Background technique [0002] Boiler water treatment methods are mainly divided into two forms: water treatment outside the boiler and water treatment inside the boiler. The water treatment technology outside the boiler mainly adopts the ion exchange method. The ion exchange method mainly uses the ion exchange resin in the ion exchange equipment to soften the water quality and reduce the Ca in the boiler feed water. +2 , Mg +2 The ion content achieves the purpose of softening water. The ion exchange equipment is suitable for the water hardness range of less than 7mmol / L. If the equipment operates normally and the water softening is qualified, the low-temperature water supply pipeline of the boiler and the high-temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/08C02F5/10C02F5/14
CPCC02F5/105C02F5/145C02F2103/02C02F2103/023C02F2303/08C02F2303/22C02F2307/14
Inventor 余新军李学军
Owner QINYANG QINGQUAN IND CO LTD
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