Corrosion inhibitor for gas boiler ultra-low temperature flue gas and its preparation method and use method

Abstract

A corrosion inhibitor for gas-fired boiler ultra-low temperature flue gas and its preparation method and use method. In terms of mass percentage, 15-25% of water, 10-20% of polyoxyethylene sorbitan fatty acid ester, 5-10 % sorbitan fatty acid ester, 50-60% alkylamines with 12-18 carbon atoms are added in the reaction kettle, heated up to 50-55°C, stirred and homogenized, then naturally cooled to room temperature to obtain the intermediate product; 10 ~30% of benzotriazole, 20~30% of triethylenetetramine and 40~70% of intermediate products are added into the reaction kettle, and then the reflux reaction is complete. The dosage of the corrosion inhibitor of the present invention is very small, and the dosing concentration is 60-100 g / 10,000 m3 of gas per hour, and the cost is low. The invention makes the ultra-low temperature waste heat of the flue gas discharged outside the boiler, the temperature of the flue gas is reduced from about 145°C to about 60°C or lower, and the recovery process is realized. The invention effectively solves the problem of corrosion of induced draft fans and flue equipment by ultra-low temperature flue gas, and finally achieves the goals of energy saving, emission reduction, potential tapping and efficiency enhancement.

Description

technical field

[0001] The invention belongs to the technical field of iron and steel metallurgy and chemical industry, and in particular relates to a corrosion inhibitor for gas-fired boiler ultra-low temperature flue gas and a preparation method and application method thereof. Background technique

[0002] Laiwu Steel has 16 boilers of different types and sizes, with a total tonnage of 1920 tons per hour. Reducing the exhaust gas temperature of boilers is of great significance to improving energy utilization. In order to further recover heat, improve the actual operating efficiency of boilers, and reduce boiler exhaust emissions in energy and power plants. Increase the thermal efficiency of the boiler by increasing the flue gas temperature and increase the power generation. On the premise of ensuring normal production, consider every aspect of the entire boiler operation from the aspects of technology, efficiency, and safety, and combine the actual working conditions to stu...

Examples

Embodiment 1

[0023] The corrosion inhibitor for the ultra-low temperature flue gas of the gas-fired boiler in this embodiment includes 10% of benzotriazole, 20% of triethylenetetramine and 70% of intermediate products by mass percentage. Wherein, the intermediate product is obtained by the following method:

[0024] Add 15% of water, 15% of polyoxyethylene sorbitan fatty acid ester, 15% of sorbitan fatty acid ester, and 55% of tridecylamine into the reaction kettle, then heat up to 55°C, and Stir under reflux for 1 h at high temperature, homogenize and cool to room temperature to obtain an intermediate product.

[0025] The preparation method of the corrosion inhibitor for ultra-low temperature flue gas of gas-fired boilers in this embodiment includes the following steps:

[0026] 1) by mass percentage, 15% water, 15% polyoxyethylene sorbitan fatty acid ester, 15% sorbitan fatty acid ester, 55% tridecylamine are added in the reactor, and the temperature is raised to Reflux and stir at 55...

Embodiment 2

[0029] The corrosion inhibitor for ultra-low temperature flue gas of gas-fired boilers in this embodiment includes 25% of benzotriazole, 25% of triethylenetetramine, and 50% of intermediate products in terms of mass percentage. Wherein, the intermediate product is obtained by the following method:

[0030] Add 15% of water, 15% of polyoxyethylene sorbitan fatty acid ester, 15% of sorbitan fatty acid ester, and 55% of cetylamine into the reaction kettle, heat up to 55° C. and reflux for 1 h, After cooling to room temperature, the intermediate product was obtained.

[0031] The preparation method of the corrosion inhibitor for ultra-low temperature flue gas of gas-fired boilers in this embodiment includes the following steps:

[0032] 1) by mass percentage, 15% water, 15% polyoxyethylene sorbitan fatty acid ester, 15% sorbitan fatty acid ester, 55% cetylamine are added in the reactor, and the temperature is raised to 55°C, and reflux and stir at this temperature for 1h, homoge...

Embodiment 3

[0035] The corrosion inhibitor for the ultra-low temperature flue gas of the gas-fired boiler in this embodiment includes 30% of benzotriazole, 25% of triethylenetetramine, and 45% of intermediate products in terms of mass percentage. Wherein, the intermediate product is obtained by the following method:

[0036] By mass percent, the mixture of 15% water, 15% polyoxyethylene sorbitan fatty acid ester, 15% sorbitan fatty acid ester, 55% tetradecylamine and trihexylamine (tetradecylamine) Alkylamine and trihexylamine (the mass ratio is 2:3) were added into the reaction kettle, the temperature was raised to 55°C, and refluxed and stirred at this temperature for 1h, homogenized and then cooled to room temperature to obtain the intermediate product.

[0037] The preparation method of the corrosion inhibitor for ultra-low temperature flue gas of gas-fired boilers in this embodiment includes the following steps:

[0038] 1) by mass percentage, the mixture of 15% water, 15% polyoxyet...

technical field

[0001] The invention belongs to the technical field of iron and steel metallurgy and chemical industry, and in particular relates to a corrosion inhibitor for gas-fired boiler ultra-low temperature flue gas and a preparation method and application method thereof. Background technique

[0002] Laiwu Steel has 16 boilers of different types and sizes, with a total tonnage of 1920 tons per hour. Reducing the exhaust gas temperature of boilers is of great significance to improving energy utilization. In order to further recover heat, improve the actual operating efficiency of boilers, and reduce boiler exhaust emissions in energy and power plants. Increase the thermal efficiency of the boiler by increasing the flue gas temperature and increase the power generation. On the premise of ensuring normal production, consider every aspect of the entire boiler operation from the aspects of technology, efficiency, and safety, and combine the actual working conditions to stu...

Examples

Embodiment 1

[0023] The corrosion inhibitor for the ultra-low temperature flue gas of the gas-fired boiler in this embodiment includes 10% of benzotriazole, 20% of triethylenetetramine and 70% of intermediate products by mass percentage. Wherein, the intermediate product is obtained by the following method:

[0024] Add 15% of water, 15% of polyoxyethylene sorbitan fatty acid ester, 15% of sorbitan fatty acid ester, and 55% of tridecylamine into the reaction kettle, then heat up to 55°C, and Stir under reflux for 1 h at high temperature, homogenize and cool to room temperature to obtain an intermediate product.

[0025] The preparation method of the corrosion inhibitor for ultra-low temperature flue gas of gas-fired boilers in this embodiment includes the following steps:

[0026] 1) by mass percentage, 15% water, 15% polyoxyethylene sorbitan fatty acid ester, 15% sorbitan fatty acid ester, 55% tridecylamine are added in the reactor, and the temperature is raised to Reflux and stir at 55...

Embodiment 2

[0029] The corrosion inhibitor for ultra-low temperature flue gas of gas-fired boilers in this embodiment includes 25% of benzotriazole, 25% of triethylenetetramine, and 50% of intermediate products in terms of mass percentage. Wherein, the intermediate product is obtained by the following method:

[0030] Add 15% of water, 15% of polyoxyethylene sorbitan fatty acid ester, 15% of sorbitan fatty acid ester, and 55% of cetylamine into the reaction kettle, heat up to 55° C. and reflux for 1 h, After cooling to room temperature, the intermediate product was obtained.

[0031] The preparation method of the corrosion inhibitor for ultra-low temperature flue gas of gas-fired boilers in this embodiment includes the following steps:

[0032] 1) by mass percentage, 15% water, 15% polyoxyethylene sorbitan fatty acid ester, 15% sorbitan fatty acid ester, 55% cetylamine are added in the reactor, and the temperature is raised to 55°C, and reflux and stir at this temperature for 1h, homoge...

Embodiment 3

[0035] The corrosion inhibitor for the ultra-low temperature flue gas of the gas-fired boiler in this embodiment includes 30% of benzotriazole, 25% of triethylenetetramine, and 45% of intermediate products in terms of mass percentage. Wherein, the intermediate product is obtained by the following method:

[0036] By mass percent, the mixture of 15% water, 15% polyoxyethylene sorbitan fatty acid ester, 15% sorbitan fatty acid ester, 55% tetradecylamine and trihexylamine (tetradecylamine) Alkylamine and trihexylamine (the mass ratio is 2:3) were added into the reaction kettle, the temperature was raised to 55°C, and refluxed and stirred at this temperature for 1h, homogenized and then cooled to room temperature to obtain the intermediate product.

[0037] The preparation method of the corrosion inhibitor for ultra-low temperature flue gas of gas-fired boilers in this embodiment includes the following steps:

[0038] 1) by mass percentage, the mixture of 15% water, 15% polyoxyet...