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Coking additive for coal-fired boiler and preparation method thereof

A coal-fired boiler and additive technology, which is applied in the direction of fuel additives, fuel, solid fuel, etc., can solve the problems of inability to effectively prevent coking, heavy transportation weight, and high transportation conditions, and achieve convenient transportation and storage, high melting point, and decoking effect Good results

Inactive Publication Date: 2017-03-29
JIANGSU RANSHUN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Several common decoking agent products currently on the market, although they can play a certain role in decoking, still have the following technical defects: First, under the condition that ordinary coal is used as fuel, these decoking agent products have better Decoking effect; but when the alkaline substances in the coal, especially the high content of sodium, cannot effectively prevent the coking phenomenon
Second, these decoker products usually contain heavy metals such as Cu, which may produce pollutants such as heavy metal aerosols during boiler combustion
Third, most decoking agent products are in liquid state, which may freeze under low temperature conditions, transport heavy weight, and transport conditions are high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Formula of decoking agent:

[0035] Magnesium hydroxide powder 89%, mixed surfactant 2%, magnesium nitrate 4%, polymer stabilizer 5%.

[0036] The preparation steps are:

[0037] 1. Weigh magnesium hydroxide powder, magnesium nitrate, mixed surfactant and polymer stabilizer respectively;

[0038] 2. Mix magnesium nitrate, mixed surfactant and polymer stabilizer, and dissolve them in water with 8-12 times the mass to form emulsion A;

[0039] 3. Use high-speed mixing equipment to uniformly mix magnesium hydroxide powder with emulsion A to form slurry B;

[0040] 4. Dry the slurry B to finally form a powdered coal-fired boiler decoking additive product.

[0041] 2) How to use:

[0042] The coal is high-sodium coal with a sodium content of 3.5%, the combustion temperature is 1200 degrees Celsius, and the additive dosage is 0.8%.

[0043] 3) Effect:

[0044] Using this decoking agent, there is no obvious coking phenomenon; while using 1% copper-containing liquid de...

Embodiment 2

[0046] 1) Formula of decoking agent:

[0047] Magnesium hydroxide powder 91%, mixed surfactant 3%, magnesium nitrate 5%, polymer stabilizer 1%. Preparation method is with embodiment 1.

[0048] 2) How to use:

[0049] The coal is high-sodium coal with a sodium content of 2.5%, the combustion temperature is 1200 degrees Celsius, and the additive dosage is 1%.

[0050] 3) Effect:

[0051] Using this decoking agent, there is no obvious coking phenomenon; while using 1% copper-containing liquid decoking agent and iron-containing solid decoking agent both have relatively obvious coking phenomenon.

Embodiment 3

[0053] 1) Formula of decoking agent:

[0054] Magnesium hydroxide powder 89%, mixed surfactant 3%, magnesium nitrate 4%, polymer stabilizer 4%. Preparation method is with embodiment 1.

[0055] 2) How to use:

[0056] The coal fired is ordinary coal with a sodium content of 0.5%, the combustion temperature is 1200 degrees Celsius, and the additive dosage is 0.2%.

[0057] 3) Effect:

[0058] There is no obvious coking phenomenon when using this decoking agent.

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Abstract

The invention discloses an additive for the clinker removal of coal-fired boilers and a preparation method thereof. The additive is white solid powder, and a clinker removal agent comprises the following components in percentage by weight: 89-92% of magnesium hydroxide powder, 2-3% of a mixed surfactant, 4-5% of magnesium nitrate, and the balance of a polymer stabilizer; and the microstructure of the clinker removal agent is a core-shell structure, namely, a nano organic matter layer consisting of a surfactant, magnesium nitrate and a polymer stabilizer is coated on the surface of a magnesium hydroxide particle. The additive and water with a mass equal to that of the additive, after being mixed, can form stable turbid liquid, and after the turbid liquid is sprayed into a coal-fired furnace of a boiler, a coking phenomenon of the boiler can be effectively inhibited. The additive disclosed by the invention has the advantages that: 1, the additive is simple in operation and less in application amount; 2, the additive is good in clinker removal effect, not only can be applied to common coals, but also is applicable to inferior coals with a high sodium content; 3, the additive causes less pollution to the environment, and does not contain heavy metals; 4, compared with liquid additives, the additive is easier to transport and preserve; and 5, the additive is safe and non-toxic, and harmless to the human body.

Description

technical field [0001] The invention relates to an additive, in particular to a coal-fired boiler decoking additive and a preparation method thereof. Background technique [0002] Coking is a relatively common problem in the operation of coal-fired boilers. Boiler coking will cause problems such as reduced thermal efficiency and damage to boiler equipment. In severe cases, it may even cause furnace flameout or boiler tube burst. In view of the hazards of boiler coking, it is particularly important to study effective decoking additives for coal-fired boilers. [0003] Several common decoking agent products currently on the market, although they can play a certain role in decoking, still have the following technical defects: First, under the condition that ordinary coal is used as fuel, these decoking agent products have better Decoking effect; but when the alkaline substances in the coal, especially the high sodium content, cannot effectively prevent the coking phenomenon. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L9/10C10L10/04C10L10/00
Inventor 周群峰
Owner JIANGSU RANSHUN ENVIRONMENTAL PROTECTION TECH
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