CN201083385Y - Ignition and combustion-supporting burner of coal-fired boiler in power station - Google Patents

Abstract

The utility model relates to an ignition and combustion-supporting burner for a coal-fired boiler in a power station. It mainly includes an outer nozzle, a combustion chamber body, a square and round knot, a main nozzle, an oil burner and its pipeline. One end of the outer nozzle is connected to the main nozzle, and the other end is connected to the square and round knot. The combustion chamber body is arranged in the outer nozzle, and the front end of the combustion chamber body is connected to the oil distribution pipeline. At least one annular concentrator is arranged in the outer nozzle; step-by-step concentration and graded ignition are adopted, and the coal powder in the primary air-powder airflow is concentrated into the combustion chamber by the concentrating device, and the coal powder is ignited after the concentration is increased; the light phase airflow wind film is used for step-by-step sweeping, and the inner wall of the combustion chamber is cooled, and the coking and ablation problems are solved; the pressure increase in the combustion chamber due to the combustion and expansion of the coal powder airflow is released by using the pressure relief window opened on the combustion chamber, and the problems of ignition and combustion difficulties and unsmooth powder discharge of inferior and low-volatile coal are solved, which greatly reduces the start-up and combustion-supporting oil of the coal-fired boiler in the power station and reduces the power generation cost.

Description

Ignition and combustion-supporting burner of coal-fired boiler in power station

technical field

The utility model belongs to the field of power station coal-fired boilers, and relates to an ignition and combustion-supporting burner for a power station coal-fired boiler.

Background technique

In order to reduce the oil consumption of coal-fired boilers in power stations when they start ignition and combustion, and reduce the power generation costs of power generation companies, various energy-saving pulverized coal burners have been launched in the same industry, but there are generally complex systems and large maintenance. Poor adaptability of coal types, and problems such as increased resistance caused by combustion expansion, coking, ablation, etc., especially the poor adaptability of coal types and the problems of combustion expansion have not been well resolved.

Contents of the invention

The purpose of the utility model is to provide an effective energy-saving, lower power generation cost, easy to ignite and burn pulverized coal, not easy to coke and ablate, and suitable for ignition and combustion-supporting burner of coal-fired boilers in power stations of various coal types.

The technical solution adopted by the utility model: an ignition and combustion-supporting burner of a coal-fired boiler in a power station, mainly including an outer nozzle, a combustion chamber body, a square and a round junction, a main nozzle, an oil burner and its pipeline, and the outer nozzle of the nozzle. One end is connected to the main nozzle, and the other end is connected to the square and round junction. The outer nozzle is provided with a combustion chamber body, and the front end of the combustion chamber body is connected to the oil distribution pipeline. The outer nozzle is provided with at least one annular concentrator.

A louver concentrator is coaxially installed in the square-circle junction, and the area ratio of the outlet to the inlet of the louver concentrator is 10-100%.

The combustion chamber body is provided with a light-phase airflow outlet, a pressure relief window and a deflector of the pressure relief window, and the included angle between the deflector of the pressure relief window and the axis of the combustion chamber body is 0-90 degrees.

The main nozzle is provided with a perimeter air bellows, and the perimeter wind bellows is provided with a perimeter air outlet.

A spoiler block is arranged on the combustion chamber body.

An oil burner and a pipeline are arranged in the oil distribution pipeline.

The included angle between the annular concentrator and the axis of the outer spray pipe is 10-90 degrees.

The positive beneficial effect that the utility model has:

1. Adopt light-phase airflow film cooling technology, in the pulverized coal combustion chamber, according to the distribution of temperature, use the light-phase airflow separated by the concentration device to cool the combustion chamber, step by step purging of the light-phase airflow film, cooling The inner wall of the combustion chamber is cleaned, which not only solves the problems of coking and ablation, but also solves the problem of increased internal resistance of the burner caused by combustion expansion, resulting in unsmooth feeding of pulverized coal;

2. According to the fire heat requirements of different coal types, an oil burner of different capacity is installed at the front of the burner. Concentrate the pulverized coal into the combustion chamber through the concentration device, and then ignite it after increasing the concentration of the pulverized coal, which solves the problem of difficult ignition and combustion of inferior and low-volatile coal, and is suitable for igniting various types of pulverized coal;

3. Use the high-temperature flame from the oil burner to heat the primary air powder dense-phase airflow entering the combustion chamber to the ignition temperature of coal powder, and use high temperature and high concentration to strengthen the combustion of coal powder, effectively saving energy;

4. Through the turbulent flow of the turbulence block, the pulverized coal flow that is on fire is disturbed to improve its heat exchange capacity, and the high-temperature torch formed by the accelerated pulverized coal flow after combustion is sprayed into the furnace from the main nozzle, saving fuel consumption in the power station. The oil consumption of coal boilers when starting ignition and combustion, reducing the power generation cost of enterprises;

5. Simple structure, easy installation and maintenance.

Description of drawings

Fig. 1 is the front view of the structural representation of the utility model;

Fig. 2 is the left side view of structural representation of the utility model;

Fig. 3 is an enlarged view of part I in Fig. 1 .

Detailed ways

Referring to Fig. 1, Fig. 2, and Fig. 3, an ignition and combustion-supporting burner for a coal-fired boiler in a power station mainly includes a perimeter wind box 1, an outer nozzle pipe 2, an annular concentrator 3, a combustion chamber body 4, a square and round junction 5, Spoiler block 6, pressure relief window deflector 7, oil burner 8, oil distribution air pipeline 9, louver concentrator 10, main nozzle 11, etc.; Perimeter air outlet 101 is provided, outer nozzle pipe 2 is installed at one end of peripheral air bellows 1, square-circle junction 5 is installed at one end of outer nozzle pipe 2, louver concentrator 10 is coaxially installed inside the square-circle junction 5, the outlet and inlet area of louver concentrator 10 The ratio is between 10-100%; 1-5 annular concentrators 3 are installed on the inner wall of the outer nozzle 2, and the angle between the annular concentrator 3 and the axis of the outer nozzle 2 is 10-90 degrees, and the outer nozzle 2 A combustion chamber body 4 is arranged inside, and the combustion chamber body 4 is provided with a light-phase air flow outlet 401 and a pressure relief window 402. The distance between each light-phase air flow outlet 401 is 50-500 mm, and the combustion chamber body 4 is equipped with a spoiler 6 1. Pressure relief window deflector 7, the angle between the pressure relief window deflector 7 and the axis of the combustion chamber body 4 is 0-90 degrees, the front end of the combustion chamber body 4 is connected to the oil distribution pipeline 9, and the oil distribution pipeline 9 An oil burner 8 and pipelines are arranged inside. The connection of the above components can be assembled together by welding or screwing, and the shape of the main nozzle 11 is designed in different shapes according to different furnace types.

The working principle of the utility model: the cooling air in the perimeter air bellows 1 enters the inner wall of the main nozzle 11 through the perimeter air outlet 101, and cools the main nozzle 11; through the turbulent flow of the spoiler block 6, the pulverized coal airflow that is on fire is disturbed , improve its heat exchange capacity, accelerate the high-temperature torch formed by the pulverized coal flow after combustion, and spray it into the furnace through the main nozzle 11; The powder is concentrated step by step, and then the separated sub-concentrated pulverized coal airflow is sent into the combustion chamber body 4 through the light-phase airflow outlet 401 step by step, and it is heated by the dense-phase airflow of the primary wind powder after ignition to make it ignite Combustion, the sub-concentrated pulverized coal airflow sent in by the light-phase airflow tuyere 401 forms a complete, flowing light-phase airflow wind film protective layer on the inner wall of the combustion chamber body 4 to cool the inner wall of the combustion chamber.

When the primary wind powder flow in the combustion chamber body 4 passes through the louver concentrator 10, the coal powder is concentrated into the combustion chamber body 4 by using the inertial principle of the object, and the primary wind powder is dilute through the window set on the louver concentrator 10. The phase airflow is separated into the outer nozzle 2, and the primary wind powder dense-phase airflow entering the combustion chamber body 4 is heated to the ignition temperature of coal powder by the high-temperature flame emitted by the oil burner 8, and the principle of high temperature and high concentration is adopted to strengthen Combustion of pulverized coal; due to the combustion and expansion of the pulverized coal flow in the combustion chamber body 4, the pressure in the combustion chamber body 4 increases, causing the resistance of the burner to increase. The pressure is released into the channel between the combustion chamber and the outer nozzle 2, so that the resistance of the burner can be reduced, the powder can be fed smoothly, and the normal operation of the burner can be guaranteed.

Claims (7)

1. An ignition and combustion-supporting burner for a coal-fired boiler in a power station, mainly comprising an outer nozzle, a combustion chamber body, a square knot, a main nozzle, an oil burner and pipelines thereof, one end of the outer nozzle is connected to the main nozzle, and the other One end is connected to a square and round knot, the outer nozzle is provided with a combustion chamber body, and the front end of the combustion chamber body is connected to the oil distribution pipeline, and the feature is that at least one annular concentrator (3) is arranged in the outer nozzle (2). 2. The ignition and combustion-supporting burner of the power plant coal-fired boiler according to claim 1, is characterized in that a louver concentrator (10) is coaxially installed in the described square-circle junction (5), and the louver concentrator (10) The ratio of export to import area is 10-100%. 3. The ignition and combustion-supporting burner of a coal-fired boiler in a power station according to claim 1, characterized in that the combustion chamber body (4) is provided with a light-phase airflow tuyere (401), a pressure relief window (402) and The deflector (7) of the pressure relief window, the included angle between the deflector of the pressure relief window (7) and the axis of the combustion chamber body (4) is 0-90 degrees. 4. The ignition and combustion-supporting burner of a coal-fired boiler in a power station according to claim 1, characterized in that said main nozzle (11) is provided with a perimeter wind bellows (1), and the perimeter wind bellows (1) is provided with a perimeter wind tuyere (101). 5. The ignition and combustion-supporting burner of a coal-fired boiler in a power station according to claim 1, characterized in that a spoiler block (6) is arranged on the combustion chamber body (4). 6. The ignition and combustion-supporting burner of a coal-fired boiler in a power station according to claim 1, characterized in that an oil burner (8) and a pipeline are arranged in the oil distribution pipeline (9). 7. The ignition and combustion-supporting burner of a coal-fired boiler in a power station according to claim 1, characterized in that the angle between the annular concentrator (3) and the axis of the outer nozzle (2) is 10-90 degrees.

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