Indicator capable of rapidly determining hot water boiler feedwater hardness

A hot water boiler and rapid measurement technology, applied in the direction of using chemical indicators for analysis, can solve the problems of complex process, easy failure, cumbersome production process, etc., and achieve the effects of simple production process, low raw material cost, and fast and convenient detection.

Inactive Publication Date: 2010-06-23
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method of hardness testing has many disadvantages. First, the liquid indicator is unstable and prone to failure after long-term storage, resulting in inaccurate measurement results.
Secondly, because this method does not add a buffer solution, the pH value of the solution is outside the color change range of the indicator, resulting in incorrect color development.
Third, when using this method to measure water hardness, since no

Method used

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  • Indicator capable of rapidly determining hot water boiler feedwater hardness

Examples

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Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Prepare 100 g of an indicator suitable for detecting the hardness of hot water boiler feed water. The raw materials used are all analytical reagents. Sodium chloride 50g, sodium carbonate 20g, sodium bicarbonate 28.22g, edetate disodium 1.6g and chrome black T 0.18g.

Embodiment 2

[0016] Example 2: Prepare 100 g of an indicator suitable for detecting the hardness of hot water boiler feed water. The following raw materials are analytical reagents: 55g of sodium chloride, 15g of sodium carbonate, 27.8g of sodium bicarbonate, 2.0g of disodium edetate and 0.2g of chrome black T.

Embodiment 3

[0017] Embodiment 3: Prepare 100 g of an indicator suitable for detecting the hardness of hot water boiler feed water. The following raw materials are analytical reagents: 52g of sodium chloride, 17g of sodium carbonate, 29.22g of sodium bicarbonate, 1.6g of disodium edetate and 0.18g of chrome black T.

[0018] The preparation process is as follows:

[0019] Each component of the above weight is put into a vibratory pulverizer, pulverized and mixed in the vibratory pulverizer. After crushing for a certain period of time, take out a 100-mesh sieve, and make a light gray powdery substance, which is the product.

[0020] The method of using the above-mentioned indicator for measuring the hardness of hot water boiler feed water is: use a graduated cylinder to measure 100ml of demineralized water entering the boiler, and put it into the conical flask. Add 0.5g of indicator (during specific operation, use a teaspoon to take one level spoon of the indicator, the teaspoon is pre-ma...

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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 [0001] The invention relates to an indicator used for detecting the water quality hardness of boiler feed water when water outside the boiler is used for treatment. Background technique [0002] Boiler water treatment is a very important link in boiler operation. The quality of boiler feed water is of great importance to the safe and economical operation of the boiler, to prevent boiler explosion accidents, to prolong the service life of the boiler, to improve the heat transfer efficiency of the boiler and to save energy and reduce consumption. role. The water quality standard for industrial boilers GB / T1576-2008 stipulates that the total hardness of feed water for hot water boilers treated with chemical water outside the pot should not exceed 0.6mmol / L, and the feed water for steam boilers with steam pressure not greater than 2.5MPa treated with water outside the pot The total hardness should not be greater than 0.03mmol / L. Therefore, ensuring that the boi...

Claims

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Application Information

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IPC IPC(8): G01N31/22
Inventor 刘振法张利辉郭茹辉高玉华张彦河田彩莉
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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