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Industrial boiler water treatment method

An industrial boiler and water treatment technology, which is applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, magnetic field/electric field water/sewage treatment, etc. It can solve the problem of scaling soda water, affecting heat transfer and normal circulation of soda water , Shorten the life of the boiler and other problems, to prevent the deposition of inorganic scale, improve the effect of scale and corrosion inhibition, and improve the effect of heat exchange efficiency

Inactive Publication Date: 2011-02-02
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improper water treatment may cause boiler corrosion, fouling and co-steaming of steam and water, affecting the normal operation of the boiler
Scaling directly affects heat transfer and the normal circulation of steam and water, causing under-scale corrosion, fuel waste and shortening the life of the boiler in mild cases, and causing tube expansion, deformation or bursting accidents in severe cases
Corrosion directly affects the strength of the material, which can shorten the life of the boiler if it is light, and cause cracks, leakage or even explosion accidents if it is serious
The steam-water co-breeding directly affects the steam quality, which may cause fouling of the superheater and other steam-consuming equipment and even cause safety accidents
At present, many domestic industrial boilers directly use untreated surface water as feed water, which leads to serious fouling of these boilers during use.

Method used

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  • Industrial boiler water treatment method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The boiler feed water is tap water, and its main composition is shown in Table 1.

[0032] Table 1 Main components of tap water used in experiments

[0033]

[0034] Boiler operating conditions: 194°C, 1.25MPa.

[0035] Scale and corrosion inhibition methods:

[0036] Combined use of physical water treatment and chemical scale and corrosion inhibitors, of which (1) the physical water processor consists of two parts: a DC pulse generator and an external electromagnetic field sensor. The main technical indicators: use AC 220V, 50Hz power supply, working voltage 15V, output The power is 120W, the frequency conversion range is 20Hz~75KHz, and the carrier frequency is 1MHz. (2) The chemical scale and corrosion inhibitors are 2mg / L hydroxyethylene diphosphonic acid, 25mg / L molybdate and 10mg / L sodium sulfite.

[0037] Scale and corrosion inhibition effect: Through hanging test, the scale inhibition rate is 93.4%, and the corrosion inhibition rate is 88.2%.

Embodiment 2

[0039] The boiler feed water is tap water, and its main composition is shown in Table 1.

[0040] Boiler operating conditions: 194°C, 1.25MPa.

[0041] Scale and corrosion inhibition methods:

[0042] Combined use of physical water treatment and chemical scale and corrosion inhibitors, of which (1) the physical water processor consists of two parts: a DC pulse generator and an external electromagnetic field sensor. The main technical indicators: use AC 220V, 50Hz power supply, working voltage 15V, output The power is 120W, the frequency conversion range is 20Hz~75KHz, and the carrier frequency is 1MHz. (2) The chemical scale and corrosion inhibitors are 4mg / L hydroxyethylene diphosphonic acid, 50mg / L molybdate, and 20mg / L sodium sulfite.

[0043] Scale and corrosion inhibition effect: Through hanging test, the scale inhibition rate is 96.9%, and the corrosion inhibition rate is 95.7%.

Embodiment 3

[0045] The boiler feed water is tap water, and its main composition is shown in Table 1.

[0046] Boiler operating conditions: 194°C, 1.25MPa.

[0047] Scale and corrosion inhibition methods:

[0048] Combined use of physical water treatment and chemical scale and corrosion inhibitors, of which (1) the physical water processor consists of two parts: a DC pulse generator and an external electromagnetic field sensor. The main technical indicators: use AC 220V, 50Hz power supply, working voltage 15V, output The power is 120W, the frequency conversion range is 20Hz~75KHz, and the carrier frequency is 1MHz. (2) The chemical scale and corrosion inhibitors are 0.2mg / L hydroxyethylene diphosphonic acid, 5mg / L molybdate, and 1mg / L sodium sulfite.

[0049] Scale and corrosion inhibition effect: Through hanging test, the scale inhibition rate is 71.3%, and the corrosion inhibition rate is 78.5%.

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Abstract

The invention discloses an industrial boiler water treatment method which comprises the following two steps: (1) physical water treatment: installing an electromagnetic water treatment device on an water inlet pipe of an industrial boiler, and ensuring that the electromagnetic water treatment device is in the normal operation state in the operating process of the boiler; and (2) chemical water treatment: simultaneously adding 0.2-4mg / L of 1-hydroxy ethylidene-1,1-diphosphonic acid or 2-phosphono-1,2,4-butane tricarboxylic acid or polyacrylic acid or hydrolytic polymaleic anhydride, 5-50mg / L of molybdate or tungstate and 1-20mg / L of sodium sulfite to boiler inlet water. By organically combining electronic water treatment and chemical water treatment, the invention prevents the deposition of inorganic scales on the heat exchange surface of the industrial boiler and can remove the previously formed scales to slow metal corrosion, thereby greatly improving the heat exchange efficiency of the boiler. Compared with the traditional chemical treatment method, the technology improves the scale and corrosion inhibiting effects of the industrial boiler, reduces the consumption of chemical scale and corrosion inhibitor and has the characteristic of environment friendliness.

Description

technical field [0001] The invention relates to an industrial boiler water treatment method. technical background [0002] Below 25MPa (25 atmospheres), the temperature is generally the saturated steam temperature. The annual output of industrial boilers in my country is basically maintained at the level of 70,000 to 100,000 steam tons, with a total installed capacity of about 553,300 units, 1,906,100 steam tons, and 1,254,000 MW, which is close to twice the installed capacity of power plant boilers. The countries that produce and use the most industrial boilers. Industrial boilers are a large energy consumer in my country, and their annual coal consumption accounts for about one-third of the total coal output. Among them, small and medium-sized coal-fired industrial boilers are large in volume, accounting for more than 80% of industrial boilers, and many industrial boilers have low thermal efficiency. , The phenomenon of energy waste is serious. Improper water treatment ma...

Claims

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Application Information

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IPC IPC(8): C02F1/48C02F9/12C02F5/10
Inventor 葛红花申晶赵莉宋飞
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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