KR20060028835A - Self regenerative single head burner - Google Patents

Abstract

The present invention relates to a self-regenerative burner that mixes and combusts air and fuel at an appropriate level, and reuses thermal energy of the combusted high-temperature exhaust gas. Particularly, a damper unit coupled to both ends of the main body to flow in and out combustion air and exhaust gas. And a gas nozzle for generating thermal power, an ignition rod, and a heat storage body having a heat storage body for accumulating the temperature of the exhaust gas, which partially reburns the combustion exhaust gas, and is burned alternately by the heat storage combustion technology. The present invention relates to a self-regenerative burner which increases energy efficiency through flameless combustion and significantly reduces nitrogen oxide production.

Therefore, the self-regenerative burner of the present invention is a useful invention that can be achieved while reducing the NOx while increasing energy efficiency, that is, both high efficiency and environmental problems.

That is, it is possible to alternately supply air through the two-way damper, to form a large combustion exhaust gas recirculation structure by the air-exhaust gas flow pipe formed in the vertical direction and the orifice plate formed in the horizontal direction, alternating combustor by the regenerative combustion technology It is a useful invention that recovers the waste heat by operating the, and reduced the peak temperature emitted from the burner to suppress the generation of nitrogen oxides by flameless combustion.

In addition, it can be used in a small space because it is made of a single body, it is a useful invention that brings economic advantages due to low system installation cost.

Regenerative burner, Self regenerative burner system, Honeycomb regenerative combustion burner system, NOx

Description

Self regenerative single head burner

1 is a system diagram showing a twin regenerative burner system of a conventional regenerative combustion system;

Figure 2 is a perspective view of a conventional honeycomb type regenerative combustion burner system,

3 is a cross-sectional view showing a case where the main flame ignites at the lower end of the burner head in the self-regenerative burner of the present invention;

4 is a cross-sectional view showing the case where the main flame ignites on the burner head portion in the self-regenerative burner of the present invention;

FIG. 5 is a right side view of the burner head shown in FIG. 4 seen from the right side. FIG.

6 is a sectional view showing the main parts of a gas nozzle tube containing an ignition rod according to the present invention;

7 is a front view showing the gas nozzle of the present invention from the front,

8 is a side cross-sectional view showing the internal shape of the gas nozzle of the present invention;

9 is a side cross-sectional view showing a cross section of a burner tile inserted into a front surface of a heat storage body of the present invention;

10 is a front view showing the front of the burner tile inserted into the front surface of the heat storage body body of the present invention,

11 is a side cross-sectional view showing a cross section of the orifice plate fastened to the horizontal air-exhaust gas flow hole of the burner tile of the present invention;

12 is a partial view showing the front, side cross-section and back of the heat storage body portion of the present invention,

13 is a main configuration diagram showing a coupling relationship between the main body and the heat accumulator body through-body coupled to the main body of the present invention;

14 is a front view and a side view of the heat storage body body through-holes of the present invention;

15 is a main part configuration diagram showing the main body of the present invention and the partitions which are components thereof;

16 is a detailed cross-sectional view showing the overall shape of a second embodiment of a self-regenerative burner of the present invention;

17 is a front view showing a coupling structure of a heat storage body accommodating box made of a mesh constituted by the heat storage body part of the present invention;

Figure 18 is a perspective view showing an upper heat storage body receiving box made of a mesh configured in the heat storage body portion of the present invention.

<Brief description of the major symbols in the drawings>

10; damper portion 11; Flange

12; Damper 13; 2 way damper

15; Rotary switch 20; Gas nozzle pipe

21; Gas inlet 22; Ignition rod

23; Flame detector 24; Pilot gas inlet

25; Gas nozzle 26; Pilot air primary inlet

27; Pilot air secondary inlet 28; Pilot gas flow pipe

30; Pilot air nozzle tube 40; Heat storage body

41; Heat storage chamber 50; Orifice plate

55; Air-exhaust gas flow holes 53; Burner tile

60; Main body 61; flange

62; Air-exhaust gas flow tubes 63; septum

The present invention relates to a self regenerative burner that mixes and combusts air and fuel at an appropriate level, and accumulates and reuses thermal energy of the burned high-temperature exhaust gas. Particularly, a self regenerative burner is connected to both ends of a main body for combustion air and It consists of a damper unit for flowing in and out of exhaust gas, a gas nozzle for generating thermal power, an ignition rod, and a heat storage body with a heat storage body for accumulating the temperature of the exhaust gas. The present invention relates to a self-regenerative burner which alternately operates to operate, increases energy efficiency through flameless combustion, and significantly reduces nitrogen oxide production.

In general, burners such as burners are used to supply fuel and air at an appropriate mixing ratio to combust them, and transfer heat energy generated during the combustion to other media to melt or change temperature, and also to convert electricity or kinetic energy. Device.

Such a combustor or burner should be implemented to optimize combustion reaction and heat transfer characteristics in an industrial furnace, and to maintain an optimum temperature for high efficiency in the furnace.

In addition, the combustor or burner should be easy and safe to handle, the working environment should not be harmful to humans, and the ideal burner should be able to maintain high efficiency while minimizing heat, gas, fluid and pollutants emitted.

In other words, the combustor or burner is to pursue high efficiency, but to obtain flame stability while minimizing the amount of NOx (nitrogen oxide) emitted during combustion, the main purpose of the burner development is a task to be pursued in the future.

This is an ideal task, but it is not yet fully solved.

That is, conventionally, the amount of NOx (nitrogen oxides) emitted during the combustion of the combustor was excessive, which was a dangerous level harmful to the environment or the human body.

Therefore, many studies on the development of a combustor or burner for producing low NOx have been carried out at home and abroad for a long time. The main research areas were non-equilibrium combustion methods such as multi-stage combustion and lean / rich combustion. .

In addition, there is an exhaust gas recirculation combustion method that reduces NOx by lowering the maximum flame temperature by recirculating the combustion exhaust gas into an internal circulation method or an external circulation method. Selective Catalytic Reduction (SCR) and non-selective catalyst are used as post-treatment methods. There is a technique using a selective non-catalytic reduction (SNCR) device.

In addition, there have been many attempts such as the technology of using the reburning effect by the stepwise supply of fuel injection, and the uniformity of temperature by the surface / catalyst combustion, which is still being developed.

However, it is not easy to develop an energy-saving low NOx (nitrogen oxide) combustor that has little flame stability and no smoke, and has high thermal efficiency in an industrial furnace system.

This is because lowering the flame temperature in order to reduce NOx inevitably results in a decrease in energy efficiency.

Hereinafter, 1) non-equilibrium combustion method and 2) exhaust gas recycle combustion method related to the present invention among the NOx (nitrogen oxide) suppression methods previously researched and developed will be described sequentially.

1) Unbalanced Combustion Method

This non-equilibrium combustion method is again divided into two stages of air combustion and Bias combustion, which are the same in that they suppress the production of NOx (nitrogen oxides) by adjusting the air supply ratio for combustion.

That is, when looking at the generation ratio of NOx (nitrogen oxide) due to combustion, the portion which is the highest generation point is generated at the mixing ratio excellent in combustion efficiency by the constant mixing between fuel and air.

In other words, although the thermal efficiency is the highest in this blending ratio, NOx (nitrogen oxide) production reaches the highest point, which is double rate.

Therefore, this unbalanced combustion method is to supply air beyond the blending ratio between fuel and air for the maximum production of NOx.

More specifically, the two-stage air supply combustion method is a combustion method in which air is divided and supplied into first and second stages.

In the first stage, the amount of NOx (nitrogen oxide) is supplied in a smaller amount than the amount of air that reaches the highest point, and in the second stage, the excess amount of air is supplied to avoid the peak point of NOx (nitrogen oxide) as a whole. .

Of course, the same purpose can be achieved by supplying excess air in the first step and supplying a small amount of air in the second step.

On the contrary, the bias combustion method is a method of implementing two regions of a low air ratio region and a high air ratio region to be adjacent to each other.

In other words, one burner burns at low air ratio, the other burns at high air ratio, and operates at an appropriate air ratio as a whole, and one burner nozzle is divided largely and the other is divided into a bias tip. For example.

After all, this method also unevenly distributes the air and avoids the peak value of NOx production.

      2) Exhaust gas recirculation method

        This exhaust gas recirculation method is a method of increasing the volume of the combustion gas and lowering the temperature of the flame by recirculating and combusting the combustion gas once burned, thereby suppressing the generated NOx.

At this time, when the exhaust gas is recycled, the exhaust gas may be circulated in the combustion air, but may be recycled in the supplied fuel.

In any case, the exhaust gas recirculation method again includes external and internal corrosion, and the external type, which is the former, is a method in which a part of the exhaust gas emitted by combustion is mixed with input fuel or combustion air piping and supplied back to the combustor.

The latter, on the other hand, is a method of recycling exhaust gases in the furnace.

Both of them thus reduce the inflow of air for combustion as the exhaust gas is recycled back to the air for combustion.

This, of course, would lower the flame temperature and thus reduce the production of NOx.

As a result, 1) non-equilibrium combustion and 2) exhaust gas recirculation control the amount of air required for combustion to avoid the compounding ratio where NOx (nitrogen oxide) production is at its maximum.

It can be seen that the solution to suppress the generation of NOx (nitrogen oxide) described above to some extent, but when applied to a combustor or burner, it is still a problem how to improve the thermal efficiency.

Accordingly, the exhaust gas recirculation method is applied to a burner or the like to seek a method of simultaneously obtaining an inhibitory effect of nitrogen oxides.

That is, in order to prevent the high temperature exhaust gas generated by the flame from being discharged to the air, it is recycled, but the heat energy of the exhaust gas is collected in the regenerator and reused again.

In the burner that maintains a high temperature due to the accumulation of thermal energy in the heat storage device, combustion can be performed even in an atmosphere of low oxygen concentration, and thus it is possible to suppress the generation of NOx (nitrogen oxide) by avoiding the peak point naturally.

In addition, in industrial furnaces that do not have existing heat storage, when the flame is emitted from the burner, the internal temperature is high and the low part is partitioned.

In other words, hot and clear fire zones are present locally in some areas.

On the contrary, in the burner which is thermally stored and maintains a high temperature at all times, when the flame is emitted, the temperature is generally not high and the region of the lower portion is not partitioned, and the flame is formed long and the flame temperature is burned to a certain level.

This extends to the extent of being flameless and suppresses the generation of NOx (nitrogen oxides), and has the effect of efficiently managing the thermal energy to be discarded.

Then, as described above, by looking at the conventional embodiment (burner) in the form of regenerated and reused in the burner by applying the exhaust gas recirculation method, and looks at the problem.

First, as shown in FIG. 1, there is a twin regenerative burner system 200 in which combustors A and B, such as a burner for combustion, are installed to face left and right.

That is, the two opposed combustors A and B are provided with separate heat accumulators C and D, respectively.

Therefore, when one combustor (A) emits thermal power and emits high-temperature exhaust gas, waste heat energy of exhaust gas is accumulated in the heat storage (D) attached to the combustor (B) opposed to each other.

While maintaining this state for about 20 to 80 seconds, the next combustor (B) generates fire power and the heat accumulator (C) attached to the other combustor (A) facing accumulates heat.

That is, it works alternately, and when one side fires, the other side is used to accumulate thermal energy.

Second, Figure 2 is for the same purpose as the above-described Twin regenerative burner system, the combustors (E, F) are installed side by side side to generate heat, and the heat of exhaust gas is accumulated in the regenerator (G, H) It shows a honeycomb thermal storage combustion system 300 in the form.

By the way, in the case of such a regenerative combustor, two combustors are necessary and the manufacturing cost is generated a lot.

In particular, in the case of a combustor of less than 1000KW combustion amount, the application cost of the system is too high compared to the combustion amount, it is difficult to apply realistically.

In addition, the installation of such a burner is difficult in a furnace with a small installation space. That is, a twin regenerative burner system or a honeycomb regenerative combustion system each having two burners has a large volume and is restricted in space.

 The present invention, which solves the above-mentioned problems, is connected to both ends of the main body, and a damper unit for flowing in and out of combustion air and exhaust gas, a gas nozzle and a ignition rod for transferring thermal power, and a heat storage body for accumulating a temperature of exhaust gas It is composed of a body and the like to recycle a part of the combustion exhaust gas in the combustor, and to switch the combustion air and the exhaust gas in and out direction so that combustion by the regenerative combustion technology alternately occurs, and flameless combustion It is to provide a self-regenerative burner that increases energy efficiency and significantly reduces the amount of nitrogen oxides produced.

In addition, a pair of dampers used to flow in and out of the exhaust gas used in the present invention through the flange and the damper and the two-way damper at the bottom, and through the rotary opening and closing switch to open and close the through-hole of the two-way damper alternately It is an object of the present invention to provide a self-regenerative burner that controls and stores the outflow of gas.

The present invention is similar to the conventional one in that it is a self-regenerative burner that mixes and combusts air and fuel at an appropriate level, and accumulates and reuses thermal energy of the burned high-temperature exhaust gas.

However, it installs the burner head unit one by one and is divided up and down or left and right to operate alternately, and provides the heat storage body in two embodiments of the internal type and the external type, and the ignition is easy, and the pilot ignition It is characterized in that it prevents the case of turning off, and in order to achieve this will be described in detail with the drawings shown in the specificity of the configuration and the relationship between them.

3 and 4, a pair of dampers 10 are fastened to both ends of the main body 60 to flow in and out combustion air and exhaust gas.

The damper part provides air for combustion of the burner and serves to discharge the burned exhaust gas.

That is, the damper portion represented by this block is configured in pairs in the upper and lower portions, the damper 12 and the two-way damper 13 at the bottom coupled to each other through the flange portion 11 is formed in a pair.

In addition, the damper 12 and the two-way damper 13 are alternately rotated, and the rotary opening and closing portion 15 having a cross-sectional shape “a” shaped to open and close both through holes 14 is provided. The flow of exhaust gas flowing through the inner through hole is alternately exchanged.

FIG. 5 corresponds to a right side view of the burner head shown in FIG. 4, in which the pilot air primary inlet 26 and the pilot air secondary inlet 27 are not shown in FIG. 3 or FIG. 4. The configuration coupled to the side of the pipe 30 and the pilot air inlet direction and the main gas inlet direction are indicated.

In addition, the present invention, as shown in Figures 6 to 8, the end end gas nozzle 25 is formed obliquely extending in the radial direction is connected to the porous portion of the main body of the gas nozzle tube 20 and the pilot to the outer portion of the gas nozzle tube It is a configuration to allow air to flow, a through hole for inserting an igniter and a flame detector is provided in the gas nozzle pipe, a through hole through which pilot gas flows is provided in the center, and an upper air-exhaust gas in the upper part and the lower part. When the air flows into the flow hole 55, the main gas flow is supplied to the A and B flow holes, and when the air flows into the lower air-exhaust gas flow hole 55, the main gas flows to the C and D flow holes. It is characterized by the provision of each ball.

The gas flowing into the gas nozzle pipe flows into the main gas inlet 21, and as the flow of combustion air and exhaust gas is alternately formed in the air-exhaust gas flow hole 55, the gas flows upward and downward. It is configured to supply alternately. In addition, the pilot gas is always supplied through the pilot gas inlet 24.

That is, a long ignition rod is mounted in the metal gas nozzle tube shown in detail in FIG. 6, and a flame detector 23 is inserted into the other through hole, and a pilot flow hole 28 is provided at the center thereof. The gas nozzle 25 to which is blown off is formed.

This nozzle has six through holes penetrated therein, as shown in FIGS. 7 and 8, but is not limited to the number described in the embodiment, and is connected to the porous portion of the gas nozzle tube body.

In addition, as shown in FIGS. 3 and 4, a swiveler (part marked with X) is installed on the outer circumferential surface of the pilot air nozzle tube 30 so as to surround the outer circumferential surface, and as shown in FIG. The car pilot air is blown out.

In addition, the coupling between the gas nozzle 25 and the inner circumferential surface of the pilot air nozzle tube 30 is interviewed through projections projecting up, down, left and right on the outer surface of the gas nozzle 25 as shown in FIG. The space portion is formed.

As shown in Fig. 5, the space part functions to blow the first pilot air flowing from the side into the combustion chamber, which is also used for cooling the nozzle part, and the pilot flame does not turn off in spite of the flow disturbance at the burner tip through frequent alternating operation. It is to avoid.

3, 4 and 12, around the front of the pilot air nozzle tube 30, the heat accumulator body portion 40 in which the heat accumulator body 41 in which the heat accumulator is built is divided into upper and lower parts. Is composed.

That is, the heat accumulator chamber 41 may include a heat accumulator in various forms, but in the present invention, a heat accumulating block having a heat accumulator therein may be accommodated therein, so that a mesh as shown in FIG. It is preferable to have a pair of upper and lower heat storage body accommodating box 47 made of a) and to receive the heat storage body therein.

In addition, the upper and lower partition plates are formed in the middle of the upper heat accumulator accommodating box and the lower heat accumulator accommodating box located in the heat accumulator chamber 41 to separate the upper and lower parts, thereby providing an air supply flow path and exhaust gas. Shut off the drain flow path.

Of course, the heat storage body inserted into the heat storage chamber may be formed of a stone that accumulates heat, an alumina ball, or a ceramic honeycomb, and an important point is to allow the exhaust gas to flow inside. Anything that can be maintained can be maintained.

In addition, the burner tile 56 is inserted into the front surface of the heat accumulator body part 40 and has an air-exhaust gas flow hole 55 formed of a horizontal flow hole and a vertical flow hole, and an orifice bolted to the rear thereof. There is a plate 50.

As shown in FIGS. 9 and 10, the burner tile 56 is provided with a horizontal through hole and a vertical flow hole. The vertical flow hole of the air-exhaust gas flow hole 55 discharges exhaust gas, in particular. In this case, the circulating flow structure of the exhaust gas in the combustion chamber is formed to be large, and it is combined with an orifice plate that increases the flow velocity of the air flow passing through the heat storage chamber so as to form a large recirculation structure of the flow inside the combustion chamber. Will be.

Inflow of air flows through the orifice plate, increasing the flow rate to 100 ~ 200m / sec, forming a strong flow in the direction along the nozzle central axis, and after combustion, combustion flue gas exits the burner tile air-exhaust gas flow hole. . This flow structure exhibits a large recycling structure as a whole, and the increase in the flow rate by the orifice plate serves to strengthen this recycling structure.

In addition, the present invention, as shown in Figure 13 to 15, the heat accumulator body portion 40 and the flange 61 is coupled, through the air-exhaust gas flow pipe 62 and the partition wall 63 and the center of the center A main body 60 composed of a heat storage body central through pipe P is formed to flow in and out the exhaust gas with the operation of the damper part 10 described above, and alternately accumulate high heat of the exhaust gas in the upper and lower heat storage bodies. Help work.

Then, the self-regenerative burner of the present invention will be described in detail with reference to FIGS. 3 and 4.

That is, the main gas flows into the gas nozzle pipe 20 located outside the ignition rod 22 through the main gas inlet 21 at all times in the up and down or sinusoidal direction.

In addition, the pilot nozzle always emits a flame regardless of the switching of the main air main gas by the pilot gas and the pilot air on the front of the gas nozzle 25, in this case, as shown in FIG. It is introduced through the damper 12 of the damper unit 10.

At this time, the rotary opening and closing 15 shown in the drawing closes the right side and opens the left side so that the inlet 14 can be introduced into the through-hole 14 of the two-way damper 13.

Combustion air introduced into the main body 60 is blocked by the partition 63 and flows through the heat storage chamber 41 at the lower end to the air-exhaust gas flow hole 55 of the burner tile 56. do.

Of course, this flow of combustion air is shown in detail by arrows shown in bold.

The combustion air blown out as described above is mixed with the main gas at the nozzle outlet, and then the main flame is formed using the pilot flame by the pilot air and the pilot gas as the ignition source. Due to the flow of main air and the shape of the nozzle from which the main gas is ejected, a slightly downward flame is emitted, as shown in the figure.

At this time, the temperature at the burner tip is maintained higher than the auto ignition temperature by the combustion air and the pilot flame preheated to a high temperature, thereby making flameless. Therefore, the peak temperature is reduced and the flame shape with a very uniform temperature distribution results in stable low NOx combustion without the need for flame stability conditions.

On the other hand, the high-temperature exhaust gas generated by the flame is moved to the heat storage chamber 41 in the direction of the arrow shown in the upper space, that is, a thin line.

Passes through the air-exhaust gas flow hole 55 of the burner tile 56 configured in the upper portion and transfers and accumulates thermal energy to the heat storage body provided in the heat storage chamber 41, and the air-exhaust gas of the main body 60. Passing through the flow pipe 62 is discharged through the damper unit 10.

That is, since the left side of the through hole 14 of the two-way damper 13 of the upper damper unit 10 shown in FIG. 3 is blocked, it is discharged through the right through hole 14.

Thereafter, the rotary switch 15 of the damper part 10 is rotated by 90 degrees so that the direction of opening and closing is switched so that the burner is alternately operated.

4 is a diagram illustrating the converted state, in which the upper damper portion 10 closes the right side, and the lower damper portion 10 closes the left side.

By this action, the supply air for combustion flows again through the right through hole 14 of the lower damper portion 10.

Of course, in the same manner as in the above-described operation, the supply air for combustion passes through the air-exhaust gas flow pipe 62 of the main body, passes through the upper heat accumulator chamber 41, and is blown to the front part of the burner tile 56 to emit flames biased upward. will be.

That is, the combustion supply air is ejected in the direction of the thick arrow shown.

In addition, by the same action as described above, the supply air for combustion is discharged through the left through hole 14 of the damper unit 10 through the inside of the main body 60 in the direction of the arrow shown thinly.

Next, a description will be given of the drawings, and looks at the coupling relationship between the components of the present invention and the form of the parts thereof.

That is, ⓐ in Fig. 12 is a view showing the state of the heat accumulator body portion 40 from the front, ⓑ is a view showing the inside of the cross section of the side, ⓒ is a heat accumulator accommodating box 47 It is a figure which shows the state seen from the back so that the inserted state may be seen.

13 is a view showing a state in which the main body and the heat accumulator body through-hole is coupled to the main portion of the present invention, Figure ⓐ of Figure 14 shows a view of the heat accumulator body through-hole through the same angle as shown in FIG. Ⓑ is a view showing the side.

Ⓐ in Fig. 15 is a view showing a state of the main body, which is also the main part of the present invention, seen from the front side, ⓑ shows the main body in cross section from the side, unlike the coupling diagram of FIG. It is a figure which shows this removed state.

15 is a view showing a state in which only the partition 63 of the main body is seen from the front, and ⓓ is a plan view of the main body viewed from above.

In addition, the self-regenerative burner 100 of the present invention may be manufactured as a detachable type of removing and remounting the heat accumulator as shown in FIG. 16.

That is, according to the second embodiment of the present invention, there is a pair of damper parts 110 fastened to both ends of the main body 160 as in the first embodiment described above, and let the exhaust gas flow in and out. A gas nozzle 125 provided with a pilot air primary inlet 126 and a pilot air secondary inlet 127 through which air penetrates through the outer portion is provided. However, the heat accumulator is located outside the combustion furnace. Therefore, it is easy to clean and replace the heat storage body.

In addition, the gas nozzle pipe 120 and the gas nozzle pipe containing the main gas inlet 121 and the pilot gas inlet 124 formed on one side, the ignition rod 122 penetrating the center of the gas nozzle pipe 120 Wrapped 120 is provided with a cheap long tubular pilot air nozzle tube 130 to discharge the air at the end.

Through the main gas inlet 121 is a state in which the main gas is alternately introduced in the vertical direction or the sinus direction.

In addition, the pilot nozzle and the front of the gas nozzle 125 always emits flames regardless of the switching of the main air main gas by the pilot gas and the pilot air.

In addition, around the front portion of the pilot air nozzle tube 130, the heat accumulator chamber 141 in which the heat accumulator is built is partitioned, and an opening and closing of the heat accumulator inlet 148 into which the heat accumulator is input and a bottom of the heat accumulator. It has a heat storage body portion 140 having a heat storage body outlet 149 that can be opened and closed.

The heat accumulator body part is slightly different from the above-described first embodiment, which means that the heat accumulator chamber 141 is partitioned, and the heat accumulator inlet 148 which can replace the heat accumulator body on the top of the heat accumulator body part 140. ) Is provided, and the heat storage body outlet 149 is provided at the bottom.

In addition, the burner tile 156 inserted into the front surface of the heat storage body portion 140 and the air-exhaust gas flow hole 155 is formed in the horizontal direction and the vertical direction, and the orifice plate 150 bolted to the rear is It is configured as in the first embodiment described above, is integral with the heat accumulator body 140, the central body through the heat accumulator body through the air-exhaust gas flow pipe 162 and the partition wall 163 and the center (P) The body 160 is composed of.

Therefore, the self-regenerative burner of the second embodiment also flows combustion air and exhaust gas through the damper unit 110 and alternately accumulates high-temperature thermal energy of the exhaust gas discharged by ignition in the upper and lower heat accumulators. The preheating is the same as the first embodiment described above, and the operation and the flow of combustion air and exhaust gas are also the same.

In the self-regenerative burner of the present invention, if the switching cycle of the damper is shortened, the system efficiency is improved. If the switching cycle is too short, the durability is reduced. On the other hand, if the switching cycle is increased, the switching cycle is set to about 20 to 40 seconds in the present invention because of the problem of heat resistance and reduction of thermal efficiency.

In addition, unlike the conventional burner, the self-regenerative burner of the present invention separates fuel and air separately and injects the preheated combustion air directly into the furnace so that strong momentum acts on the center of the flame, and between the fuel and the combustion air. Due to the strong flow shear effect of, flameless combustion without flame dissipation is generally possible due to the structure that is easily prone to base flame extinction or due to the ambient temperature preheated to the high temperature at the burner tip at a high temperature. Low NOx combustion is achieved stably.

In addition, the faster the injection speed of the combustion air, the more the recirculated flow, and the narrower the distribution of injection of fuel and coaxial air, because the increased flow of recirculated flow into the fuel and coaxial air portion, The recycled flow of exhaust gas is introduced into the fraction that may be present, and as the combustion air injection rate increases, the inflow to this fraction increases.

As described above, the self-regenerative burner of the present invention is a useful invention that can be achieved while reducing the NOx while increasing energy efficiency, that is, both high efficiency and environmental problems.

In other words, it is a useful invention that operates the alternating combustor to recover the waste heat by the self regenerative combustion technology which greatly promotes the recirculation of the combustion exhaust gas, and reduces the peak temperature emitted from the burner to suppress the generation of nitrogen oxides by flameless combustion.

That is, in a conventional heat storage system, two burners are used in a set, whereas the self-regenerative burner of the present invention uses a plurality of nozzles in one burner head to alternately use exhaust outlets for combustion exhaust air and blower air for combustion. It is a highly efficient device in which heat exchange in the burner is performed together with the recirculation effect of the combustion exhaust gas.

Therefore, the combustion of flameless high-temperature air produces less nitrogen oxides and provides fuel-saving technology, and it is possible to accumulate combustion in one burner even in a narrow space as compared to the conventional twin method. The environment is very high and especially stable combustion characteristics are achieved even in the temperature rising process compared to the conventional twin type.

Claims (4)

In a self-regenerative burner which mixes and combusts air and fuel at an appropriate level, accumulates thermal energy of the burned high-temperature exhaust gas and uses it to preheat the supply air for combustion. A pair of dampers 10 fastened to both ends of the main body 60 to control inflow and outflow of combustion air and exhaust gas; The end gas nozzle 25 extending in an oblique direction to the end is connected to a porous portion penetrated through the main body of the gas nozzle tube 20 and is configured to allow pilot air to flow to an outer portion of the gas nozzle tube. A through hole into which the igniter and the flame detector can be inserted is provided in the inside, and a through hole through which the pilot gas flows is provided in the center, and the ignition rod 22 and the flame sword inserted through the inside of the gas nozzle tube 20 are provided. A gas nozzle pipe 20 accommodating the retainer 23; A long tubular pilot air nozzle tube 30 surrounding the gas nozzle tube 20 and discharging air at an end thereof; A heat accumulator body part 40 having a heat accumulator chamber 41 in which a heat accumulator is built up, divided into an upper and lower part or a left and right part around a front part of the pilot air nozzle tube 30; The burner tile 56 inserted into the front surface of the heat accumulator body 40 and having an air-exhaust gas flow hole 55 formed of a horizontal flow hole and a vertical flow hole and bolted to the rear of the burner tile 56. )and; The main body 60 is coupled to the heat accumulator body 40 and the flange 61, and consists of an air-exhaust gas flow pipe 62, a partition 63, and a central through-pipe P passing through the center. )end; The self-regenerative burner, which is organically coupled to each other and flows in and out combustion air and exhaust gas through the damper part 10 and accumulates high thermal energy of the exhaust gas discharged by ignition in the upper and lower or left and right heat accumulators alternately. . Combining air and fuel to the appropriate level to burn, accumulate the heat energy of the burned high-temperature exhaust gas and use it to preheat the supply air for combustion, and the heat accumulator is located outside the combustion furnace so that the heat accumulator can be easily replaced. In the burner, A pair of dampers 110 coupled to both ends of the main body 160 to allow the exhaust gas to flow in and out; The end gas nozzle 125 formed to extend in an oblique direction to the end is connected to the porous portion penetrated through the gas nozzle tube 120, the pilot gas flows to the outer portion of the gas nozzle tube, the gas nozzle tube A through hole for inserting an igniter and a flame detector is provided in the inside, and a through hole through which a pilot gas flows is provided in the center, and an ignition rod 122 and a flame sword inserted through the inside of the gas nozzle pipe 120 are provided. A gas nozzle tube 120 accommodating a keeper 123 and a pilot gas flow hole 128; A cheap long tubular pilot air nozzle tube 130 surrounding the gas nozzle tube 120 and discharging air at an end thereof; Around the front part of the pilot air nozzle tube 130, a heat storage body burr 141 in which a heat storage body is built is partitioned, and an opening and closing of the heat storage body inlet 148 into which the heat storage body is input and an opening and closing of the heat storage body at the bottom. A heat accumulator body part (140) having a possible heat accumulator outlet (149); An orifice plate 150 inserted into the front surface of the heat accumulator body 140 and having an air-exhaust gas flow hole 155 formed in a horizontal direction and a vertical direction and bolted to the rear of the burner tile 156; A body 160 integrated with the heat accumulator body part 140 and having an air-exhaust gas flow pipe 162 and a partition wall 163 and a central heat penetrating body P passing through the center of the body; The self-regenerative burner, which is organically coupled to each other and flows in and out combustion air and exhaust gas through the damper unit 110 and alternately accumulates high thermal energy of the exhaust gas discharged by ignition in the upper and lower or left and right heat accumulators. . The method according to claim 1 or 2, The pair of dampers 10 for flowing in and out the exhaust gas, A damper 12 and a two-way damper 13 at the bottom coupled to each other through the flange portion 11; A rotary opening and closing hole 15 alternately rotating at the center of the damper 12 and the two-way damper 13 to open and close both through holes 14; Self-regenerative burner characterized in that the organic gas is organically combined with each other to flow in and out. The method of claim 1, In the heat storage chamber 41 in which the heat storage body is built, A self-regenerative burner, characterized in that the upper and lower pair of heat storage accommodating boxes (47) made of a mesh is accommodated to accumulate heat so that the heat storage block built therein can be accommodated.

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