CN101750469A - Indicator capable of rapidly determining hot water boiler feedwater hardness - Google Patents
Indicator capable of rapidly determining hot water boiler feedwater hardness Download PDFInfo
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- CN101750469A CN101750469A CN200910175359A CN200910175359A CN101750469A CN 101750469 A CN101750469 A CN 101750469A CN 200910175359 A CN200910175359 A CN 200910175359A CN 200910175359 A CN200910175359 A CN 200910175359A CN 101750469 A CN101750469 A CN 101750469A
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Abstract
An indicator capable of rapidly determining hot water boiler feedwater hardness is characterized by being prepared by the following components in parts by weight: 50-55 parts of sodium chloride, 15-20 parts of sodium carbonate, 25-30 parts of sodium bicarbonate, 1.6-2.0 parts of disodium ethylene diaminetetraacetate and 0.18-0.20 part of eriochrome black T. The components of the indicator do not contain crystal water, therefore the indicator is stable in property and not prone to deliquescence and overcomes the defect that the disodium hydrogen phosphate and sodium dihydrogen phosphate contain lots of crystal water, thus being prone to deliquescence. The invention adopts the eriochrome black T as the color indicator, thus overcoming the defect that the color indicator is unstable when the ratios of acid chrome blue K and naphthol green B misfits each other when the KB indicator is adopted. The indicator is simple in production process, low in raw material cost and rapid and convenient in detection.
Description
Technical field
The present invention relates to a kind of indicator that is used to detect boiler feed water water hardness when adopting the outer water treatment of pot.
Background technology
Boiler water processing is important link in the boiler operatiopn, the quality of boiler feed water water quality is to the safety and economic operation of boiler, prevent that boiler explosion accident from taking place, in the serviceable life of prolonged boiler, the heat transfer efficiency that improves boiler has important effect with saving energy and reduce the cost.Industrial Boiler water quality standard GB/T1576-2008 regulation: adopt the water treatment of pot outer chemical hot-water boiler should be not more than 0.6mmol/L to total hardness of water, adopt the vapor pressure of the outer water treatment of pot be not more than 2.5MPa steam boiler should be not more than 0.03mmol/L to total hardness of water.Therefore it is most important for the safe and economical boiler operation to guarantee that boiler feed water hardness satisfies afore mentioned rules.
At present, the method for mensuration boiler feed water hardness has following two kinds:
1. the metal indicator eriochrome black T is dissolved in 95% ethanol, is mixed with 0.5% solution, the indicator of this solution as the mensuration water hardness.During use, get a certain amount of water sample and add a few drop of liquid indicator, blue if water sample becomes, then water sample is qualified; If water sample reddens, then water sample is defective.This kind hardness detection method has a lot of shortcomings, at first, liquid indicator instability, the long-term placement easily lost efficacy, thereby caused measurement result inaccurate.Secondly, because the method does not add buffer solution, thereby the pH value that makes its solution causes and can not correctly develop the color beyond color range of indicator.The 3rd, when using the method to measure water hardness, owing to do not add the complexometry agent, can not the quantitative measurement water hardness, and have only when water hardness is zero, solution just can become blueness.And present national standard and do not require that the water hardness one that enters boiler is decided to be zero.So, can only make the suitable frequent regeneration of softened water equipment, increase the cost of water treatment.
2. the metal indicator eriochrome black T is dissolved in 95% ethanol, is mixed with 0.5% indicator solution, prepare certain density disodium ethylene diamine tetraacetate standard solution then, when detecting water hardness, add a certain amount of ammonia monochlor(in)ate ammonium buffer solution.Amount according to the EDTA standard solution that consumes calculates water hardness.
Though the method can accurately determine water hardness, do not solve liquid indicator problem apt to deteriorate.In addition, because the method need be prepared disodium ethylene diamine tetraacetate standard solution and ammonia monochlor(in)ate ammonium buffer solution, need set up special water analysis laboratory and need the specialty analysis laboratory personnel, one-time investment is very big, and trivial operations.
Chinese patent " a kind of water hardness quickly measuring agent CN105743,1992." a kind of pH value buffering agent is provided is anhydrous lithium hydroxide and boric acid; sodium hydrogen phosphate and sodium dihydrogen phosphate; indicator is acid chrome blue K or KB indicator, complexing agent are that disodium ethylene diamine tetraacetate and neutral salt are not more than a kind of water hardness quickly measuring agent of 0.03 equivalent parts per million as protectant low-pressure boiler feed-water hardness that is applicable to.This patent when configuration fast measuring agent earlier the mixed solution with ammoniacal liquor and ammonium chloride indicator is dissolved, fully mix with other reagent again, the potpourri with humidity places drying basin dry then, after the abundant drying, the taking-up porphyrize mixes.Adopt this fast measuring agent indicator need be dissolved in advance, it is easily moist that the pH value buffering agent contains moisture, and need prior drying etc., and it exists production run loaded down with trivial details, shortcomings such as complex process.
Summary of the invention
The object of the present invention is to provide a kind of stable performance, long shelf-life, simple, a kind of fast and accurately hot-water boiler feed-water hardness detection of the detection indicator of production run.
The present invention adopts following technical scheme: the present invention is the indicator that adopts following ratio of weight and number component to make: sodium chloride 50～55, sodium carbonate 15～20, sodium bicarbonate 25～30, disodium ethylene diamine tetraacetate 1.6～2.0 and eriochrome black T 0.18～0.20.
Good effect of the present invention is as follows: the indicator of a kind of fast measuring hot-water boiler feed-water hardness that the present invention proposes, its principal ingredient is as follows: sodium chloride, sodium carbonate, sodium bicarbonate, disodium ethylene diamine tetraacetate, eriochrome black T.For hot-water boiler, its ratio of weight and number is: sodium chloride 50～55, sodium carbonate 15～20, sodium bicarbonate 25～30, disodium ethylene diamine tetraacetate 1.6～2.0 and eriochrome black T 0.18～0.20.
It is pure that the raw material of preparation indicator is analysis, the preparation method of indicator of the present invention is as follows: sodium chloride, sodium carbonate, sodium bicarbonate, disodium ethylene diamine tetraacetate and eriochrome black T are put into comminutor with certain proportion, when being crushed to 100 orders, be product of the present invention.
Indicator provided by the invention in use, get the feedwater of 100ml, add the 0.5g indicator (during operation with one little spoonful, little spoon customizes in advance, make one flat spoonful of indicator be not more than 0.5g, get one flat spoonful of indicator and get final product), shake up, observe the change color of water sample, if water sample becomes blueness and represents that then water hardness is qualified.Promptly for hot-water boiler, determining total hardness of water is not more than 0.6mmol/L; The feedwater water quality that meets " Industrial Boiler water quality standard GB/T1576-2008 " regulation if water sample becomes redness, represents that then water hardness is defective.
The indicator prescription of fast measuring hot-water boiler feed-water hardness provided by the invention is compared with existing water hardness quickly measuring agent and had the following advantages: (1) pH value is adjusted agent and is adopted sodium carbonate and sodium bicarbonate, component of the present invention does not contain water of crystallization, stable performance, be difficult for deliquescence, overcome in sodium hydrogen phosphate and the sodium dihydrogen phosphate component and contained bulk crystallization water, easily the shortcoming of deliquescence.(2) adopting eriochrome black T is color indicator, when acid chrome blue K and naphthol green B proportioning are improper when having overcome employing KB indicator, and the unsettled shortcoming of color indicator.(3) indicator production technology of the present invention is simple, and the cost of raw material is low, detects quick and convenient.
Embodiment
The invention is further illustrated by the following examples, but be not limited to its scope.
Embodiment 1: preparation is applicable to the indicator 100g that detects the hot-water boiler feed-water hardness.The raw materials used analytical reagent that is.Sodium chloride 50g, sodium carbonate 20g, sodium bicarbonate 28.22g, disodium ethylene diamine tetraacetate 1.6g and eriochrome black T 0.18g.
Embodiment 2: preparation is applicable to the indicator 100g that detects the hot-water boiler feed-water hardness.Following raw material is analytical reagent: sodium chloride 55g, sodium carbonate 15g, sodium bicarbonate 27.8g, disodium ethylene diamine tetraacetate 2.0g and eriochrome black T 0.2g.
Embodiment 3: preparation is applicable to the indicator 100g that detects the hot-water boiler feed-water hardness.Following raw material is analytical reagent: sodium chloride 52g, sodium carbonate 17g, sodium bicarbonate 29.22g, disodium ethylene diamine tetraacetate 1.6g and eriochrome black T 0.18g.
Process for preparation is as follows:
Each component of above-mentioned weight is put into vibrating pulverizer, in vibrating pulverizer, pulverize and mix.After pulverizing certain hour, took out 100 purpose sieves, and made grayish powdered substance and be this product.
Use the above-mentioned method that is used to measure the indicator of hot-water boiler feed-water hardness to be: to measure the softening water that 100ml enters boiler with graduated cylinder, put in the conical flask.The indicator (with this indicator one flat spoon of a little bale-out, this little spoon customizes in advance during concrete operations, and the indicator of a flat spoon is no more than 0.5g) that adds 0.5g is in conical flask.Shake up, observe change in color.If color becomes blueness and represents that promptly water hardness is qualified, if color becomes redness and represents that promptly water hardness is defective.
Above-mentioned indicator 0.5g is joined respectively in the experimental water of known hardness, its change color result as shown in Table 1:
Table one
As seen, use the indicator of fast measuring hot-water boiler feed-water hardness of the present invention to measure water hardness from embodiment 1-embodiment 3, change color is obvious, can the rapid and accurate determination water hardness.
Claims (1)
1. the indicator of a fast measuring hot-water boiler feed-water hardness is characterized in that it is the indicator that adopts following ratio of weight and number component to make: sodium chloride 50～55, sodium carbonate 15～20, sodium bicarbonate 25～30, disodium ethylene diamine tetraacetate 1.6～2.0 and eriochrome black T 0.18～0.20.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910175359A CN101750469A (en) | 2009-12-17 | 2009-12-17 | Indicator capable of rapidly determining hot water boiler feedwater hardness |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910175359A CN101750469A (en) | 2009-12-17 | 2009-12-17 | Indicator capable of rapidly determining hot water boiler feedwater hardness |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267144A (en) * | 2014-10-16 | 2015-01-07 | 天津农学院 | Water total hardness test solution for aquaculture and aquarium as well as preparation method and use method of test solution |
| CN107607526A (en) * | 2016-07-11 | 2018-01-19 | 福建大北农水产科技有限公司 | A kind of breeding water body total hardness quick detection kit |
| CN108333296A (en) * | 2018-01-26 | 2018-07-27 | 山东五洲检测有限公司 | A kind of determining total hardness of water detection agent and preparation method thereof |
| CN114441524A (en) * | 2022-02-14 | 2022-05-06 | 上海蓝长自动化科技有限公司 | Water hardness determination reagent combined with continuous flow analyzer |
-
2009
- 2009-12-17 CN CN200910175359A patent/CN101750469A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267144A (en) * | 2014-10-16 | 2015-01-07 | 天津农学院 | Water total hardness test solution for aquaculture and aquarium as well as preparation method and use method of test solution |
| CN104267144B (en) * | 2014-10-16 | 2016-05-18 | 天津农学院 | Total hardness of water test fluid and preparation method thereof and using method for aquaculture and the Shui nationality |
| CN107607526A (en) * | 2016-07-11 | 2018-01-19 | 福建大北农水产科技有限公司 | A kind of breeding water body total hardness quick detection kit |
| CN108333296A (en) * | 2018-01-26 | 2018-07-27 | 山东五洲检测有限公司 | A kind of determining total hardness of water detection agent and preparation method thereof |
| CN114441524A (en) * | 2022-02-14 | 2022-05-06 | 上海蓝长自动化科技有限公司 | Water hardness determination reagent combined with continuous flow analyzer |
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Open date: 20100623 |