CN102818265A - Application of heat-accumulating high-temperature air burning method in burner and burning furnace - Google Patents

Abstract

The invention discloses application of a heat-accumulating high-temperature air burning method in a burner and a burning furnace. A honeycomb-shaped alloy net is installed on a straight-through pulverized coal burner. After fuel in a fuel tank is pumped out through a fuel pump, the fuel enters a fuel pipe through a fuel regulating valve, and fuel sprayed out of a fuel nozzle is ignited. Compressed air pressed out through an air compressor enters a primary air inlet channel, burning of the fuel is supported when the air is blown out, and flames of the burning fuel are sprayed out of a horn-shaped opening. Pulverized coal air flow is ignited by the fuel flames after blown out from slits positioned on the outer side of the horn-shaped opening. Air blown out through an air blower enters a secondary air inlet channel through an air door, and burning of pulverized coal is supported after the air is blown out. A flame detector is installed outside the honeycomb-shaped alloy net. A computer controller controls the air door according to supply quantity of the pulverized coal and signals of the flame detector, and accordingly quantity of air blown into the secondary air inlet channel is controlled. The vast majority of flames of the straight-through pulverized coal burner are covered inside the straight-through pulverized coal burner through the honeycomb-shaped alloy net, and only extremely small blue flames can emerge out of the honeycomb-shaped alloy net.

Description

Application of Heat Storage High Temperature Air Combustion Method in Burners and Furnaces

Technical field:

The invention relates to the application of a heat storage high-temperature air combustion method in a burner and a combustion furnace.

Background technique:

In traditional burners and furnaces, the combustion of combustibles is open, and the burning flame moves upwards to form a towering flame. We know that the higher the temperature of the burning flame, the easier it is for the combustibles to be ignited near the flame; the combustibles will be ignited when they come into contact with air that exceeds the ignition temperature of the combustibles; the higher the air temperature, the faster the combustibles will be ignited The faster it is, the greater the amount of combustibles that are ignited and the stronger the flame. Although the combustion of combustibles can heat the nearby air and unburned combustibles, the carbon dioxide, water vapor and nitrogen in the air that do not support the combustion of combustibles produced by combustibles are lighter than the outside air after being heated and expanded, so these The flue gas has rising buoyancy and quickly leaves the flame, and takes away a large amount of heat to reduce the temperature of the flame; because the heat generated by the burning combustibles heats the unburned combustibles to decompose into small molecular hydrocarbons and carbon particles, The incomplete combustion of combustibles will produce carbon monoxide. These small molecule combustibles will be taken away by the smoke generated by combustibles before burning, forming blue or white smoke; blue smoke contains a lot of carbon particles, white In addition to carbon particles, smoke also contains a large amount of water vapor. Existing burners or boilers have excessive air distribution, and the amount of air provided often exceeds the amount of air required for combustible combustion. Sometimes the burner or furnace needs to distribute the air twice. For example: the wind blown by the small blower in the heavy oil combustion furnace supports the primary combustion of heavy oil, and the initial combustion of heavy oil decomposes a large amount of combustibles such as small molecular hydrocarbons, carbon monoxide and carbon particles; the secondary air distribution is not aimed at the heavy oil flame, but on The small molecular combustibles produced by the combustion and decomposition of quasi-heavy oil make these small molecular combustibles fully combustible; if one-time large air volume is used to distribute the air, the excess air will The heat generated by the burning heavy oil flame is taken away, and when the temperature of the burning heavy oil flame is lower than the ignition point of the heavy oil, the heavy oil flame will be extinguished. Because the exhaust gas produced by the combustion of combustibles quickly leaves the flame of combustible combustion, it takes away a large amount of heat and reduces the temperature of the burning flame, causing many small molecular combustibles that were decomposed before being burned to be taken away by the exhaust gas. A blue waste fume was formed. Therefore, the combustion of traditional burners and furnaces is insufficient combustion, wasting energy and causing pollution. For example: the structure of the diesel stove used in the hotel kitchen is that the diesel pump pumps out the diesel oil in the diesel tank and sprays it out from the nozzle of the burner through the diesel regulating valve, and is ignited by the waste paper that is put into the burner, and blown in by the blower. The wind of the burner supports the combustion of the diesel fuel injected into the burner, forming a whirring upward string of flames. The red flame produced by the combustion of diesel in a diesel furnace is the flame formed by the combustion of a large amount of carbon particles; the blue smoke produced by the combustion of diesel in a diesel furnace is due to the large amount of unburned carbon particles in the smoke; the combustion of diesel in a diesel furnace The smoke produced is very choking, because some small molecular hydrocarbons decomposed during the combustion of diesel oil are discharged along with the smoke; therefore, the exhaust gas of the diesel furnace must be discharged into the sky through the chimney. If the diesel combustion in the diesel stove is sufficient, we can directly use the flame generated by the combustion to heat the cooking pot like a gas stove, and the utilization efficiency of the heat generated by the diesel combustion will be higher, and there is no pollution. The incomplete combustion of the pulverized coal in the direct-flow pulverized coal burner in the boiler produces thick blue smoke. In order to fully burn the pulverized coal, water vapor is added to the primary air distribution; although this can fully burn the pulverized coal, it reduces the The temperature of the combustion flame reduces the temperature of the boiler. The incomplete combustion of coal in the chain coal combustion furnace will also produce blue smoke, so the chain of the general chain boiler is transported by the coal water slurry; although the water allows the coal on the chain to fully burn, it reduces the coal combustion flame on the chain. temperature, which reduces the boiler temperature. In an ultra-supercritical coal-fired power unit, the temperature of the water in the seamless steel pipe coming out of the boiler exceeds 600°C; this requires that the temperature of the coal-fired flame is very high, and the flue gas of the boiler must exceed 800°C at least. Therefore, adding water vapor to primary air distribution or adding water to coal to form coal-water slurry to fully burn coal is not suitable for use in boilers of ultra-supercritical coal-fired power generating units.

Invention content:

The invention can overcome the defects of insufficient combustion of combustibles and low flame temperature of the traditional burner or combustion furnace.

The application of the heat storage high-temperature air combustion method of the present invention in a burner and a combustion furnace. Use honeycomb alloy mesh, honeycomb infrared ceramic plate or foam alloy plate to install on the burner or combustion furnace. The honeycomb alloy mesh, the honeycomb infrared ceramic plate or the foam alloy plate are equipped with flame detectors. The computer controller controls the amount of air blown into the burner or furnace by the blower according to the supply of combustibles and the signal given by the flame detector. In order to prevent the burner of the gas stove from backfiring and causing an explosion due to a large amount of air intake at one time, or to prevent the flames of oil burners, oil burners and coal-fired furnaces from being blown out due to a large amount of air intake at one time, it is necessary to check the burner or The combustion furnace takes the air in two different positions, and the vortex generated at the same time makes the small molecular combustibles decomposed from the original combustibles fully mixed with the air. When the flame outside the honeycomb alloy mesh, honeycomb infrared ceramic plate or foam alloy plate is very high, the flame detector sends a signal to the computer controller, and the computer controller increases the last air intake by controlling the damper, so that the honeycomb alloy mesh, The flame outside the honeycomb infrared ceramic plate and the foam alloy plate is very low. In this way, most of the combustibles are burned in the burner or the combustion furnace, and a small amount of carbon monoxide produced by the incomplete combustion of the combustibles in the burner or the combustion furnace is eliminated when passing through the honeycomb alloy mesh, honeycomb infrared ceramic plate or foam alloy plate. Ignite, forming a short blue flame. Combustion of the original combustibles in the burner or furnace, heating of the unburned original combustibles and small molecular combustibles decomposed by heat in the burner or furnace, and the air entering the burner or furnace, in the burner or furnace The high-temperature combustibles supported by heat-storing high-temperature air in the combustion furnace are fully combusted.

Example 1: Install the honeycomb alloy mesh on the DC pulverized coal burner. Start the fuel pump, the fuel pump draws the fuel in the fuel tank through the fuel regulating valve into the fuel pipe, and then the fuel sprayed from the fuel nozzle is ignited. Start the air compressor, the compressed air from the air compressor enters the primary air inlet channel and blows out to support the combustion of the fuel sprayed from the fuel nozzle, and the flame of fuel combustion is sprayed out from the bell mouth. The pulverized coal airflow is blown out from the gap outside the bell mouth and then ignited by the fuel flame. The wind blown by the blower enters the secondary air inlet channel through the damper, and supports the combustion of carbon particles and carbon monoxide produced by incomplete combustion of pulverized coal after exiting the secondary channel. The honeycomb alloy mesh is equipped with a flame detector. The computer controller controls the damper according to the supply of pulverized coal and the signal given by the flame detector, thereby controlling the amount of air blown by the blower into the secondary air inlet channel of the DC pulverized coal burner; Most of the flame of the pulverized coal burner is covered in the DC pulverized coal burner, and only a very short blue flame emerges from the honeycomb alloy mesh.

Example 2: install it on a diesel burner with a honeycomb alloy mesh. Remove the honeycomb alloy mesh, ignite the cotton poured with diesel oil and put it into the diesel burner, then cover the honeycomb alloy mesh back. Start the diesel pump to pump out the diesel in the diesel tank and send it into the fuel pipe through the fuel regulating valve, and then it is sprayed out from the fuel nozzle in the diesel burner and ignited by the burning cotton flame. Start the blower, and the wind blown by the blower enters the primary air inlet passage through the damper, and then enters the diesel burner to support the combustion of the diesel fuel sprayed from the fuel nozzle in the diesel burner. Adjust the fuel regulating valve and damper so that the honeycomb alloy mesh covers most of the flames of the diesel burner in the diesel burner, and only a very short blue flame emerges from the honeycomb alloy mesh.

Example 3: The honeycomb alloy mesh is installed above the chain coal-fired furnace, the chain transports the coal to the chain coal-fired furnace to be ignited, and the air enters from the primary air inlet channel and blows to the coal burned on the chain to support the coal. Combustion; the wind blown by the blower enters the secondary air inlet channel through the damper, and the wind from the secondary air inlet channel supports the combustion of carbon particles and carbon monoxide produced by incomplete combustion of coal from the side; a flame detector is installed above the honeycomb alloy mesh , the computer controller controls the damper according to the supply of coal and the signal given by the flame detector, thereby controlling the air volume blown by the blower into the secondary air inlet channel of the chain coal-fired furnace, so that the honeycomb alloy mesh burns the chain coal Most of the flames of the furnace are covered in the chain coal-burning furnace, and only very short blue flames emerge from the honeycomb alloy mesh.

Example 4: The honeycomb alloy mesh is installed above the fluidized bed combustion furnace, the coal on the fluidized bed is ignited, the air enters from the primary air inlet channel, and then passes upward through the fluidized bed to support the combustion of the coal on the fluidized bed The air blown by the blower enters the secondary air inlet channel through the damper, and then blows in from the side of the coal flame burning on the fluidized bed to support the combustion of carbon particles and carbon monoxide produced by the incomplete combustion of coal on the fluidized bed; honeycomb alloy mesh The side is equipped with a flame detector, and the computer controller controls the damper according to the coal supply and the signal given by the flame detector, so as to control the air volume blown by the blower into the secondary air inlet channel of the fluidized bed combustion furnace, so that the honeycomb The alloy mesh covers most of the flames of the fluidized bed combustion furnace in the fluidized bed combustion furnace, and only a very short blue flame emerges from the honeycomb alloy mesh;

Description of drawings:

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of the present invention applied in a once-through pulverized coal burner.

Fig. 2 is an appearance diagram of the application of the present invention in a diesel burner.

Fig. 3 is a principle diagram of the present invention applied in a chain coal-fired combustion furnace.

Fig. 4 is a schematic diagram of the application of the present invention in a fluidized bed coal-fired combustion furnace.

Detailed ways:

Experiment 1: Install the direct-flow pulverized coal burner 1 with a honeycomb alloy mesh 12 . Start the fuel pump, the fuel pump pumps out the fuel in the fuel tank and enters the fuel pipe 15 through the fuel regulating valve, and the fuel sprayed from the fuel nozzle is ignited. Start the air compressor, and the compressed air that the air compressor presses out enters the primary air inlet channel 13 and blows out to support the combustion of the fuel sprayed from the fuel nozzle, and the flame of fuel combustion is ejected from the bell mouth. The pulverized coal airflow 16 is ignited by the fuel flame after being blown out from the slit outside the bell mouth. The wind blown by the blower enters the secondary air inlet passage 14 through the damper, and supports the combustion of carbon particles and carbon monoxide produced by the incomplete combustion of pulverized coal after coming out from the secondary passage 14. The honeycomb alloy mesh 12 is equipped with a flame detector 11, and the computer controller controls the damper according to the supply of pulverized coal and the signal given by the flame detector 11, thereby controlling the secondary air intake blown by the blower into the DC pulverized coal burner 1 The amount of air in the channel 14; the honeycomb alloy mesh 12 covers most of the flames of the DC pulverized coal burner 1 in the DC pulverized coal burner 1, and only a very short blue flame emerges from the honeycomb alloy mesh 12 out. After the pulverized coal combustion in DC pulverized coal burner 1 li was normal, stop the fuel pump and close the fuel regulating valve to make the fuel oil flame extinguish; then the fuel oil pipe 15 is withdrawn. In the traditional DC pulverized coal burner 1, if the load is reduced to 70%, that is, the pulverized coal flow 16 amount is reduced by 30%, the flame in the DC pulverized coal burner 1 will be reduced due to the reduction of the pulverized coal combustion temperature. off. And when the DC pulverized coal burner 1 of the present invention that has used the storage combustion high-temperature air combustion method reduces the load to 70%, as long as the damper is turned down, the amount of air that enters the secondary passage 14 will decrease, so that the pulverized coal remains still Can burn normally. Since the pulverized coal in the direct-flow pulverized coal burner 1 of the present invention can be fully burned, the generated heat is also high, the temperature of the flue gas is very high, and blue smoke or black smoke will not cause pollution.

Experiment 2: Install the honeycomb alloy mesh 12 on the diesel burner 2, remove the honeycomb alloy mesh 2, ignite the cotton poured with diesel oil and put it into the diesel burner 2, then cover the honeycomb alloy mesh 12 back ;Start the diesel pump to extract the diesel oil in the diesel tank and send it into the fuel pipe 15 through the fuel regulating valve, then ignite it by the burning cotton flame after being sprayed out from the fuel nozzle in the diesel burner; into the primary air intake channel 13, and then into the diesel burner to support the combustion of diesel fuel sprayed from the fuel nozzle in the diesel burner 2; Part of the flame is covered in the diesel burner 2, and only a very short blue flame emerges from the honeycomb alloy mesh 12. In this way, we can put the bottom of the frying pan close to the blue flame on the honeycomb alloy mesh 12 to cook like a gas stove; we don't have to worry about burning the bottom of the pan, and we don't have to use a chimney to remove the smoke generated by the diesel burner 2. Spray away.

Experiment 3: The honeycomb alloy mesh 12 is installed above the chain coal-fired combustion furnace 3 . Chain 17 transports coal to the chain coal-fired combustion furnace 3 and is ignited, and air enters from the primary air inlet channel 13 and blows to the coal burned on the chain 17 to support the combustion of coal. The wind blown by the blower enters the secondary air inlet passage 14 through the damper, and the wind coming out from the secondary air inlet passage supports the combustion of carbon particles and carbon monoxide produced by incomplete combustion of coal from the side. A flame detector 11 is installed above the honeycomb alloy mesh 12 . The computer controller controls the damper according to the supply of coal and the signal given by the flame detector 11, thereby controlling the air volume blown into the chain coal-fired combustion furnace 3 secondary air intake passage 14 by the blower; Most flames of the coal-fired combustion furnace 3 are covered in the chain coal-fired combustion furnace 3, and only very short blue flames emerge from the honeycomb alloy mesh 12. Due to the full combustion of coal, the temperature of the flue gas produced is very high, and there will be no blue smoke or black smoke to pollute the environment; unlike the traditional chain coal-fired furnace 3, which transports coal-water slurry on the chain 17, the coal-water slurry produced by combustion The flue gas temperature is very low.

Experiment 4: Install the honeycomb alloy mesh 12 on the upper side of the fluidized bed combustion furnace 4 . The coal on the fluidized bed 18 is ignited, and the air enters from the primary air inlet passage 13, and then passes upward through the fluidized bed 18 to support the combustion of the coal on the fluidized bed 18. The air blown by the blower enters the secondary air inlet channel 14 through the damper, and then blows in from the side of the coal flame burning on the fluidized bed 18 to support the combustion of carbon particles and carbon monoxide produced by incomplete combustion of coal on the fluidized bed 18. A flame detector 11 is installed above the honeycomb alloy mesh 12 . The computer controller controls the damper according to the supply of coal and the signal given by the flame detector 11, thereby controlling the amount of air blown into the secondary air inlet passage 14 of the fluidized bed combustion furnace 4 by the blower; the honeycomb alloy mesh 12 will Most of the flames of the fluidized bed combustion furnace 4 are covered in the fluidized bed combustion furnace 4, and only very short blue flames emerge from the honeycomb alloy mesh 12. Because the coal burns very fully, the temperature of the flue gas produced is very high, and there will be no blue smoke or black smoke to pollute the environment.

Claims (5)

1. Application of a heat storage high-temperature air combustion method in a burner and a combustion furnace, characterized in that: a honeycomb alloy mesh (12), a honeycomb infrared ceramic plate or a foam alloy plate are installed on the burner or the combustion furnace , a honeycomb alloy mesh (12), a honeycomb infrared ceramic plate or a foam alloy plate is equipped with a flame detector (11), and the computer controller controls the blower according to the supply of combustibles and the signal given by the flame detector (11) The amount of air blown into the burner or the burner; in order to prevent a large amount of air intake at one time from causing the burner of the gas stove to backfire and cause an explosion When the flame is blown out, the burner or furnace needs to be air-intaked twice at different positions, and the vortex generated at the same time makes the small molecule combustibles decomposed from the original combustibles fully mixed with the air; honeycomb alloy mesh (12), honeycomb When the flame outside the shaped infrared ceramic plate or the foam alloy plate was very high, the flame detector (11) sent a signal to the computer controller, and the computer controller increased the last air intake by controlling the damper, so that the honeycomb alloy mesh (12), The flame outside the honeycomb infrared ceramic plate makeup foam alloy plate is very low; in this way, most of the combustibles are burned in the burner or furnace, and a small amount of carbon monoxide produced by the incomplete combustion of combustibles in the burner or furnace When passing honeycomb alloy mesh (12), honeycomb infrared ceramic plate or foam alloy plate, it is ignited to form a shorter blue flame; the original combustibles in the burner or burner burn, and the heating burner or burner The unburned original combustibles and small molecular combustibles decomposed by heat, as well as the air entering the burner or furnace, form heat storage in the burner or furnace, and the high-temperature combustibles are fully burned supported by high-temperature air. 2. The application of a heat storage high-temperature air combustion method in burners and combustion furnaces, characterized in that: the honeycomb alloy mesh (12) is installed on the direct-current pulverized coal burner (1), the fuel pump is started, and the fuel pump The fuel in the fuel tank is pumped out and enters the fuel pipe (15) through the fuel regulating valve, and the fuel sprayed from the fuel nozzle is ignited; the air compressor is started, and the compressed air from the air compressor enters the primary air inlet passage (13), When blowing out, it supports the combustion of the fuel sprayed from the fuel nozzle, and the flame of fuel combustion is ejected from the bell mouth; the pulverized coal airflow (16) is ignited by the fuel flame after blowing out from the gap outside the bell mouth; Secondary air inlet channel (14), after coming out from the secondary channel (14), supports the combustion of carbon particles and carbon monoxide produced by the incomplete combustion of coal powder; the honeycomb alloy mesh (12) is equipped with a flame detector (11), The computer controller controls the damper according to the supply amount of pulverized coal and the signal given by the flame detector (11), thereby controlling the air volume blown by the blower into the secondary air inlet channel (14) of the DC pulverized coal burner, so that the honeycomb The honeycomb alloy mesh (12) covers most of the flames of the DC pulverized coal burner (1) in the DC pulverized coal burner (1), and only a very short blue flame emerges from the honeycomb alloy mesh (12) . 3. Application of a heat storage high-temperature air combustion method in burners and combustion furnaces, characterized in that: the honeycomb alloy mesh (12) is installed on the diesel burner (2), and the honeycomb alloy mesh (12) is removed ), put the cotton poured with diesel oil into the diesel burner (2) after being ignited, and then cover the honeycomb alloy mesh back; start the diesel pump to extract the diesel oil in the diesel tank and send it into the fuel pipe through the fuel regulating valve (15 ), then it is ignited by the burning cotton flame after being ejected from the fuel nozzle in the diesel burner (2); the blower is started, and the wind blown by the blower enters the primary air intake passage (13) through the damper, and then enters the diesel burner (2 ) to support the combustion of the diesel fuel sprayed from the fuel nozzle in the diesel burner (2); adjust the hot oil regulating valve and damper so that the honeycomb alloy mesh (12) covers most of the flame of the diesel burner (2) in the diesel In the burner (2), only a very short blue flame emerges from the honeycomb alloy mesh (12). 4. The application of a heat storage high-temperature air combustion method in burners and combustion furnaces, characterized in that: a honeycomb alloy mesh (12) is installed on the top of the chain coal-fired combustion furnace (3), and the chain (17) will The coal is transported to the chain coal-fired combustion furnace (3) and ignited, and the air enters from the primary air inlet passage (13) and blows to the coal burned on the chain (17), supporting the combustion of the coal; the air blown by the blower enters the secondary air through the damper. The air inlet channel (14), the wind coming out from the secondary air inlet channel (14) supports the combustion of carbon particles and carbon monoxide produced by incomplete combustion of coal from the side; a flame detector (11) is installed above the honeycomb alloy mesh (12) ), the computer controller controls the damper according to the supply amount of coal and the signal given by the flame detector (11), thereby controlling the air volume blown into the secondary air inlet channel (14) of the chain coal-fired combustion furnace (3) by the blower , so that the honeycomb alloy mesh (12) covers most of the flames of the chain coal-fired combustion furnace (3) in the chain coal-fired combustion furnace (3), only a very short blue flame emerges from the honeycomb alloy mesh (12) pop up. 5. Application of a heat storage high-temperature air combustion method in burners and combustion furnaces, characterized in that: a honeycomb alloy mesh (12) is installed above the fluidized bed combustion furnace (4), and the fluidized bed (18 ) is ignited, the air enters from the primary air inlet channel (13), and then passes upwards through the fluidized bed (18) to support the coal combustion on the fluidized bed (18); the wind blown by the blower enters the secondary air inlet through the damper The wind channel (14) is then blown in from the side of the burning coal flame on the fluidized bed (18), supporting the combustion of carbon particles and carbon monoxide produced by the incomplete combustion of coal on the fluidized bed (18); the honeycomb alloy mesh (12 ) is equipped with a flame detector (11), and the computer controller controls the damper according to the coal supply and the signal given by the flame detector (11), thereby controlling the secondary flow of the blower blown into the fluidized bed combustion furnace (4). The amount of air in the air inlet channel (14) makes the honeycomb alloy mesh (12) cover most of the flames of the fluidized bed combustion furnace (4) in the fluidized bed combustion furnace (4), and only a very short blue Flame emerges from the honeycomb alloy mesh (12).

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