KR20190103675A - Fluidized bed combustion system including liquid magnet - Google Patents

Abstract

A fluidized bed combustion system including a liquid magnet is disclosed. More specifically, according to an embodiment of the present invention, the fluidized bed combustion system comprises: a combustion chamber (100) including a liquid magnet (LM) therein; a solenoid coil (410) surrounding an outer side surface of the combustion chamber (100); and a power supply device (420) applying a current to the solenoid coil (410).

Description

Fluidized bed combustion system including liquid magnet

The present invention relates to a combustion system, and more particularly, to a combustion system capable of continuously maintaining fluidization inside a fluidized bed by forming a fluidized bed using a liquid magnet.

In addition to the interest in air pollution by fine dust, research is being actively conducted to minimize the generation of NOx and SOx corresponding to precursors of fine dust generated during combustion.

As a method for minimizing the generation of NOx and SOx, for example, a method of performing combustion by controlling the combustion temperature by forming a fluidized bed in the combustion chamber and avoiding a temperature at which NOx is actively generated.

Here, fluidized bed combustion refers to a fluidized bed in which the inert particle flows up and down when air is blown from the lower part of the bed made of inert particle groups such as limestone, coal ash and sand during combustion for fluidized bed thermal power generation. It refers to a combustion technique for burning combustible materials such as coal (see FIG. 1).

The fluidized bed may be classified into a fixed bed, a bubble fluidized bed, and a circulating fluidized bed according to its type, and fluidized bed combustion has the following advantages.

Since the fuel to be burned is surrounded by an inert medium, even if the fuel type, ash, water content, etc. are changed, the combustion is less affected. Therefore, low-quality fuels such as pulverized coal combustion, which are not suitable for the existing combustion furnace, can be used.

In addition, it is possible to maintain the temperature inside the combustion chamber at 850 ° C to 950 ° C, which is lower than that of the conventional pulverized coal combustion furnace, so that the generation of NOx due to nitrogen in the air is suppressed. At the same time, it is possible to remove SOx and improve the heat transfer effect through the use of fluidized bed materials.

However, the Si-based particle group (for example, sand, etc.), which is mainly used as the fluidized bed material, is discharged from the combustion furnace along with ash in the fluidization process and the combustion process, and then flows into the cyclone to continuously fill the fluidized bed. There is a limit that requires supplementation (see FIG. 2).

In addition, fluidized bed materials introduced into the cyclone often have the problem of damaging the interior of the cyclone, which also affects the operational degradation of the entire combustion system.

Korean Patent Publication No. 10-0301993 discloses an electric dust treatment method for obtaining pig iron and condensed zinc by melting and reducing dust with electricity consisting of magnetic and non-magnetic components. Specifically, the present invention discloses an electric furnace dust treatment method capable of producing nonmagnetic dust and magnetic dust with pig iron or condensed zinc by selecting the furnace dust using a separate fluidized bed reduction furnace, a cooler, and a fluidized bed magnetic separator.

However, this type of electric furnace has a limitation that only focuses on the method of recycling dust with electricity, and there is no consideration of replenishment of fluidized bed material and damage in the cyclone by fluidized bed material discharged with the dust.

Japanese Laid-Open Patent Publication No. 2000-0065488 discloses a wear protection structure of a fluidized bed boiler heat transfer tube that wraps a heat transfer tube provided in a fluidized bed of a fluidized bed boiler with a removable permanent magnet. Specifically, the outer surface of the heat transfer tube inside the fluidized bed boiler is wrapped with a removable permanent magnet to disclose a wear protection structure of the heat transfer tube that can prevent damage to the heat transfer tube by the fluidized bed material.

However, this type of structure is possible to prevent wear of the heat pipe inside the boiler, but it is difficult to solve the problem of replenishment of the fluidized bed material and to prevent the damage of the cyclone by the fluidized bed material discharged with the dust.

Korea Patent Registration No. 10-0301993 (2001.11.22.) Japanese Patent Laid-Open No. 2000-0065488 (2000.03.03.)

The object of the present invention is not to require continuous replenishment of the fluidized bed material, to prevent cyclone damage by the fluidized bed material discharged with the ash and to increase the service life of the entire combustion system, while controlling the fluidization, and the amount of NOx produced. To provide a combustion system that can reduce the heat sink and improve the heat transfer efficiency.

In order to achieve the above object, the present invention, the combustion chamber 100 including a liquid magnet (LM) therein; A solenoid coil 410 surrounding the outer surface of the combustion chamber 100; And a power supply unit 420 for applying a current to the solenoid coil 410.

In addition, when a current is applied to the solenoid coil 410, an electric field is formed in the combustion chamber 100, and the liquid magnet LM in the combustion chamber 100 may be moved corresponding to the direction of the electric field. have.

In addition, the direction of the electric field may be a direction from the lower side to the upper side inside the combustion chamber 100.

In addition, the power supply device 420 may alternately repeat the application of the current to the solenoid coil 410 at a predetermined time interval.

In addition, when the power supply device 420 alternately repeats the application and interruption of the current, the movement of the liquid magnet LM upwards and downwards is alternately repeated so that the liquid magnet LM It may be circulated in the combustion chamber 100.

In addition, the liquid magnet LM may include 1-butyl-3-methylimidazolium cation.

In addition, one side of the combustor 100 may be connected in fluid communication with the preheater 220, and the other side of the combustor 100 may be connected in fluid communication with the fuel storage unit 210.

In addition, the upper side of the combustor 100 may be connected in fluid communication with the cyclone (310).

In addition, one side of the cyclone 310 may be connected in fluid communication with the ID-Fan 320, and one side of the ID-Fan 320 may be connected in fluid communication with the stack 330.

In addition, the exhaust gas generated in the combustion chamber 100 passes through the exhaust gas outlet 130 formed above the combustor 100, and passes through the cyclone 310, the ID-Fan 320, and the stack 330. It can be discharged to the outside.

According to the present invention, since the fluidized bed is formed inside the combustion chamber by using the liquid magnet as the fluidized bed material, the fluidized bed can be controlled by the electric field, thereby facilitating the control of the degree of fluidization.

Therefore, since the flow rate of the air flowing into the combustion chamber from the preheater does not need to be injected above the minimum flow rate, the selection range of the air inflow rate is varied.

In addition, since the liquid magnet reacts only in the electric field region, it can be used permanently without causing the loss of the fluidized bed material and the resulting filling problem.

Thus, the fluidized bed material flowing out from the combustion chamber into the cyclone is significantly reduced, thereby preventing damage inside the cyclone by the fluidized bed material.

Furthermore, the main component of the liquid magnet is iron oxide, which can reduce the amount of NOx produced by the chemical reaction, and improve the heat transfer effect inside the fluidized bed combustion chamber because the heat transfer coefficient is high.

1 shows a fluidized bed combustion system according to the prior art.
2 shows a fluidized bed combustion chamber according to the prior art.
3 illustrates a fluidized bed combustion system according to an embodiment of the present invention.
4 illustrates a combustion chamber and fluidized bed formation of the fluidized bed combustion system of FIG. 3.
FIG. 5 is a diagram illustrating a flow of a liquid magnet in a combustion chamber according to application of current to the fluidized bed forming unit of FIG. 4.
FIG. 6 is a view illustrating a change in the flow of the liquid magnet in the combustion chamber according to the application and blocking of current in the fluidized bed forming unit of FIG. 4.

Hereinafter, a fluidized bed combustion system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The term 'liquid magnet (LM)' used in the following description refers to all materials that are magnetic as ionic liquids. In one embodiment, the liquid magnet LM may be provided as a mixture of a magnetic iron oxide anion and an '1-butyl-3-methylimidazolium' cation which is an organic ion.

The term "oxidant" as used in the description below refers to any gas capable of combustion reaction with fuel. In one embodiment, the oxidant may be air.

The term 'minimum flow rate' in the following description means the minimum injection velocity of fluidized bed air to move the fluidized bed material upwards to form a fluidized bed in the combustor.

1. Problems of Fluidized Bed Combustion Systems According to the Prior Art

1 and 2, the fluidized bed combustion system according to the prior art is further supplied with sand and fluidized bed air as fluidized bed material in addition to fuel and air for combustion in the combustion chamber.

When sand is introduced from the sand supply unit located above and fluidized bed air is introduced from the fluidized bed air supply unit located below, a fluidized bed in which sand flows in the vertical direction is formed by the flow of the fluidized bed air.

At this time, when the fluidized bed air is not supplied or when the fluidized bed air is supplied at a speed not sufficient to form the fluidized bed, the sand no longer rises and is moved to the lower side of the combustion chamber by the difference in density. A sand outlet must be formed at the bottom to discharge the furnace.

In addition, when the supply speed of the fluidized bed air is too high, the sand is discharged together with the exhaust gas through the exhaust gas discharge portion formed in the upper side of the combustion chamber, and then introduced into the connected cyclone to cause damage to the interior of the cyclone.

That is, when sand is used as the fluidized bed material, injection of sand due to the loss of sand must be continued, and supply of fluidized bed air for flowing sand in the vertical direction must be continued.

In particular, the speed of fluidized bed air must be fast enough to form a fluidized bed inside the combustion chamber, but small enough that the sand is not discharged towards the cyclone with the exhaust gas, so controlling the supply rate of fluidized bed air is also cumbersome. Becomes

Although the potable fluidized bed is formed, the supply and discharge of sand continues. In this case, since the supply speed of the fluidized bed air for forming the fluidized bed is constantly changing, the operation of changing the supply speed must be accompanied accordingly.

Furthermore, there is a need for a separate sand outlet for discharging the accumulated sand on the lower side and additional equipment for supplying the discharged sand back into the combustion chamber.

2. Description of Configuration of Fluidized Bed Combustion System 10

The fluidized bed combustion system 10 according to the embodiment of the present invention solves the problems of the fluidized bed combustion system according to the related art by using the liquid magnet LM as the fluidized bed material, while generating NOx which is an advantage of the conventional fluidized bed combustion system. Both suppression and heat transfer efficiency synergistic effects can be achieved.

Hereinafter, a fluidized bed combustion system 10 according to an embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4.

The fluidized bed combustion system 10 according to the illustrated embodiment includes a combustion chamber 100, a combustion supply unit 200, an exhaust gas treatment unit 300, and a fluidized bed forming unit 400.

(1) Description of the combustion chamber 100

In the combustion chamber 100, combustion is caused by fuel and oxidant supplied therein. In the illustrated embodiment, the combustion chamber 100 is cylindrical in cross section rectangular, but the shape is changeable.

Fuel and oxidant are combusted in the combustion chamber 100, and the heat generated by the combustion is recovered by a fluidized bed and a heat exchanger (not shown) which will be described later, and the generated exhaust gas is discharged to the outside of the combustion chamber 100.

In addition, the liquid magnet LM is accommodated in the combustion chamber 100 to form a fluidized bed by the fluidized bed forming unit 400, which will be described later, to achieve a combustion efficiency increase and a reduction effect such as NOx. Detailed description thereof will be described later.

The combustion chamber 100 is connected in fluid communication with the combustion supply unit 200 and the exhaust gas treatment unit 300, which will be described later, and the fluidized bed forming unit 400, which will be described later, surrounds the outer surface of the combustion chamber 100.

The combustion chamber 100 includes a fuel inlet 110, an oxidant inlet 120 and an exhaust gas outlet 130.

1) Description of the fuel inlet 110

The fuel inlet 110 forms a passage through which the fuel stored in the fuel storage unit 210 of the combustion supply unit 200 to be described later flows into the combustion chamber 100. The fuel inlet 110 is connected in fluid communication with the fuel reservoir 210 to be described later.

The fuel injected through the fuel inlet 110 may be a solid fuel such as coal or a liquid fuel.

In the illustrated embodiment, the fuel inlet 110 is formed above the combustion chamber 100, but the position thereof is changeable.

2) Description of the oxidant injection hole 120

The oxidant inlet 120 forms a passage through which the oxidant preheated in the preheater 220 of the combustion supply unit 200 to be described later is introduced into the combustion chamber 100 for combustion. The oxidant injection hole 120 is connected in fluid communication with the preheater 220 to be described later.

In the illustrated embodiment, the oxidant inlet 120 may be formed under the combustion chamber 100 so that the injected oxidant may provide a transfer force for allowing the liquid magnet LM to move upward. The position of the oxidant injection hole 120 can be changed. In addition, the flow rate and speed of the oxidant injected through the oxidant injection hole 120 may be controlled.

3) Description of the exhaust gas outlet 130

The exhaust gas outlet 130 forms a passage through which exhaust gas generated after combustion occurs in the combustion chamber 100 is discharged to the outside of the combustion chamber 100. The exhaust gas outlet 130 is connected in fluid communication with a cyclone 310 of the exhaust gas treatment unit 300 to be described later.

The position of the exhaust gas outlet 130 may be changed, but as shown in the illustrated embodiment, the exhaust gas outlet 130 may be discharged from the combustion chamber 100 while the generated exhaust gas is moved upward by the density difference. It is preferable that it is formed above.

(2) Description of the combustion supply part 200

The combustion supply unit 200 supplies fuel and an oxidant so that combustion may occur in the combustor 100. The combustion supply 200 is connected in fluid communication with the combustor 100.

The combustion supply unit 200 includes a fuel storage unit 210 and a preheater 220.

1) Description of the fuel storage unit 210

The fuel storage unit 210 stores fuel for supplying the combustor 100. The fuel storage unit 210 may be in fluid communication with the fuel inlet 110 of the combustor 100, so that the fuel stored in the fuel storage unit 210 may be supplied to the combustor 100.

The fuel storage unit 210 may store fuel in various phases. That is, a solid fuel or a liquid fuel such as coal can be stored.

A passage for connecting the fuel storage unit 210 and the fuel inlet 110 may be provided with a separate flow control device (not shown) for controlling the amount of fuel supplied.

The fuel storage unit 210 may have a separate fuel inlet (not shown) for receiving fuel from the outside.

2) Description of Preheater 220

The preheater 220 increases the temperature of the oxidant by preheating the oxidant before the oxidant is supplied to the combustion chamber 100, thereby increasing the combustion efficiency in the combustion chamber 100.

The preheater 220 is connected in fluid communication with the oxidant inlet 120 of the combustion chamber 100.

The preheater 220 includes an oxidant supply port 221, a preheat burner 222 and a preheat oxidant outlet 223.

The oxidant supply port 221 forms a passage through which the oxidant flows from the outside of the preheater 220. The oxidant supply port 221 connects the preheater 220 and the oxidant supply unit (not shown) in fluid communication.

The preheat burner 222 generates a flame for preheating the oxidant introduced through the oxidant supply port 221. To generate the flame, the preheat burner 222 may include a separate fuel injection unit (not shown) and an oxidant injection unit (not shown).

The preheat oxidant outlet 223 forms a passage through which the preheated oxidant is discharged by the flame generated from the preheat burner 222. The preheating oxidant outlet 223 is connected in fluid communication with the oxidant inlet 120 of the combustion chamber 100, so that the preheated oxidant may be supplied into the combustion chamber 100.

(3) Description of the flue gas treatment unit 300

The exhaust gas treatment unit 300 separates and removes the dust particles existing in the exhaust gas discharged from the combustion chamber 100, and then discharges them to the outside of the fluidized bed combustion system 10. The exhaust gas treatment unit 300 is connected in fluid communication with the exhaust gas outlet 130 of the combustion chamber 100.

The exhaust gas processing unit 300 includes a cyclone 310, an IDD-Fan (Induced Draft-Fan) 320, and a stack 330.

1) Description of Cyclone 310

The exhaust gas discharged from the combustion chamber 100 flows into the cyclone 310 and is discharged after removing the dust and the like present in the exhaust gas using centrifugal force. The cyclone 310 may include a separate motor (not shown) and a rotating shaft member (not shown) for generating centrifugal force.

The exhaust gas from which the large particles of dust are primarily removed from the cyclone 310 is introduced into the ID-Fan 320 to be described later, and then discharged to the outside of the fluidized bed combustion system 10 through the stack 330 to be described later.

In order to discharge the dust removed from the cyclone 310, one side of the cyclone 310 may be formed in a fluid discharge portion (not shown) in fluid communication with the outside.

Cyclone 310 includes a cyclone inlet 311 and a cyclone outlet 312.

The cyclone inlet 311 forms a passage through which the exhaust gas discharged from the exhaust gas outlet 130 of the combustor 100 flows into the cyclone 310. The cyclone inlet 311 is connected in fluid communication with the exhaust gas outlet 130.

The position of the cyclone inlet 311 can be changed, but as shown in the illustrated embodiment, the dust particles present in the exhaust gas introduced into the cyclone 310 are separated and then fall naturally to be discharged to the lower side of the cyclone inlet 311. Is preferably located above the cyclone 310.

The cyclone outlet 312 forms a passage through which exhaust gas from which dust particles are separated is discharged to the outside of the cyclone 310. The cyclone outlet 312 is connected in fluid communication with the ID-Fan inlet 321 of the ID-Fan 320 to be described later.

2) Description of ID-Fan 320

The ID-Fan 320 provides a transfer force for flowing the exhaust gas from the combustion chamber 100 to the stack 330 which will be described later.

In the illustrated embodiment, the ID-Fan 320 is located between the cyclone 310 and the stack 330 to be described later, each side of the cyclone outlet 312 of the cyclone 310 and the stack 330 to be described later. Is in fluid communication with the stack inlet 331.

In one embodiment, ID-Fan 320 generates a lower pressure than fluidized bed combustion system 10, specifically combustion chamber 100 and cyclone 310, to flow flue gas from combustion chamber 100 to stack 330. Can provide a feed force.

ID-Fan 320 may be provided as other forms that can provide a transfer force to the exhaust gas.

ID-Fan 320 includes an ID-Fan inlet 321 and an ID-Fan outlet 322.

The ID-Fan inlet 321 forms a passage through which exhaust gas discharged from the cyclone 310 flows. In the illustrated embodiment, the ID-Fan inlet 321 is located above the ID-Fan 320, but its position is changeable.

The ID-Fan inlet 321 is connected in fluid communication with the cyclone outlet 312 of the cyclone 310. The exhaust gas introduced through the ID-Fan inlet 321 is discharged through the ID-Fan outlet 322 which will be described later.

The ID-Fan outlet 322 forms a passage through which the exhaust gas introduced into the ID-Fan 320 is discharged to the stack 330 to be described later. In the illustrated embodiment, the ID-Fan outlet 322 is located below the ID-Fan 320, but its position is changeable.

The ID-Fan outlet 322 is connected in fluid communication with the stack inlet 331 of the stack 330, which will be described later. The exhaust gas discharged through the ID-Fan outlet 322 is introduced into the stack 330 to be described later.

3) Description of Stack 330

The stack 330 forms a passage through which exhaust gas discharged from the ID-Fan 320 flows in and is discharged to the outside of the fluidized bed combustion system 10. In the illustrated embodiment, the stack 330 is provided as a form of chimney, but the form is changeable.

Stack 330 includes a stack inlet 331 and a stack outlet 332.

The stack inlet 331 forms a passage through which the exhaust gas discharged from the ID-Fan outlet 322 of the ID-Fan 320 flows into the stack 330. The stack inlet 331 is connected in fluid communication with the ID-Fan outlet 322.

In the illustrated embodiment, the stack inlet 331 is located below the stack 330 but its position is changeable.

The stack outlet 332 forms a passage through which the exhaust gas introduced into the stack 330 is discharged to the outside of the stack 330. The stack outlet 332 may be formed in the form of an opening to be in fluid communication with the outside of the stack 330.

In the illustrated embodiment, the stack outlet 332 is located above the stack 330 but its position is changeable.

However, considering that the exhaust gas flowing into the stack 330 is a high temperature gas and moves upwardly due to the difference in density, the stack inlet 331 is discharged to the lower side of the stack 330 and discharged upward. Below the stack 330, the stack outlet 332 is preferably formed above the stack 330.

(4) Description of the fluidized bed forming unit 400

3 and 4, the fluidized bed combustion system 10 according to the embodiment of the present invention includes a fluidized bed forming unit 400.

The fluidized bed forming unit 400 substantially performs a role of applying an electric field to the liquid magnet LM accommodated in the combustion chamber 100 to flow upward, or releasing the electric field to flow downward. A detailed description of the flow process of the liquid magnet LM will be described later.

In the illustrated embodiment, the fluidized bed forming unit 400 is located on the outer surface of the combustion chamber 100.

The fluidized bed forming unit 400 includes a solenoid coil 410 and a power supply 420.

1) Description of Solenoid Coil 410

The solenoid coil 410 forms a conductive wire through which a current flows when the power supply 420 to be described later applies a current, thereby generating an electric field.

In the illustrated embodiment, the solenoid coil 410 is provided in a form surrounding the outer circumferential surface of the combustion chamber 100 spirally wrapped from the lower side to the upper side, but the solenoid coil 410 may generate an electric field from the lower side to the upper side. It may be provided as other forms.

The phenomenon in which the direction of the electric field is determined according to the direction of the current applied to the solenoid coil 410 may be explained by the right screw law of Enper, which is a well known law, and thus a detailed description thereof will be omitted.

The solenoid coil 410 may be made of a conductive wire, and may be manufactured including a ferromagnetic material having a strong magnetic force to generate magnetization to strengthen an electric field.

The solenoid coil 410 is connected to the power supply device 420 to be described later so that the current can flow.

2) Description of Power Supply 420

The power supply 420 applies or releases current to the solenoid coil 410 by supplying or removing power to the fluidized bed forming unit 400.

In the illustrated embodiment, the power supply device 420 is provided such that the positive pole is upwardly spaced apart from a side of the combustion chamber 100 by a predetermined distance. It may be provided as another form that can apply a current to generate an electric field in the direction.

The power supply 420 may be provided in any form capable of applying or releasing current. In one embodiment, the power supply 420 may be provided in the form of a toggle switch that can be turned on and off at regular time intervals.

The application and interruption of the current of the power supply device 420 may be alternately repeated according to a preset time interval, and the preset time interval may be determined according to the required degree of formation of the fluidized bed.

The strength and direction of the current applied by the power supply 420 may be adjusted.

The power supply 420 is connected to the solenoid coil 410 so that a current can flow.

3. Description of the process in which the liquid magnet LM flows by the fluidized bed forming unit 400

The fluidized bed combustion system 10 according to the embodiment of the present invention forms a fluidized bed using the liquid magnet LM accommodated in the combustion chamber 100, thereby reducing the effect of the fluidized bed combustion system without problems related to the loss and replenishment of fluidized bed material. All can be achieved.

In addition, the amount of NOx generated may be reduced through chemical reaction between iron oxide, which is a main component of the liquid magnet LM, and exhaust gas. Since iron oxide has a high heat transfer coefficient, a heat transfer effect inside the combustion chamber 100 is increased.

Furthermore, since the liquid magnet is used as the fluidized bed material, the outflow is minimized to prevent damage inside the cyclone 310 by the fluidized bed material discharged from the combustion chamber 100 and introduced into the cyclone 310.

(1) Description of movement of liquid magnet LM in combustion chamber 100

Hereinafter, a process of moving the liquid magnet LM in the combustion chamber 100 of the fluidized bed combustion system 10 according to the exemplary embodiment of the present invention will be described in detail.

When the power supply device 420 does not apply a current, the liquid magnet LM is in a state where the liquid magnet LM is sunk under the combustion chamber 100 due to its own weight.

When the power supply 420 applies a current, the current moves along the lead and circulates through the solenoid coil 410 (A direction in FIG. 5).

When a current flows through the solenoid coil 410, an electric field is generated in the direction from the lower side to the upper side of the combustion chamber 100 according to the Enfer right screw law (B direction in Fig. 5).

At this time, the liquid magnet LM that has sunk under the combustion chamber 100 is moved to the upper side of the combustion chamber 100 along the direction of the electric field.

As described above, the intensity of the current applied by the power supply device 420 can be adjusted, an electric field generated along the central axis of the solenoid coil 410 and along the central axis of the combustion chamber 100 (C direction in FIG. 5). It may be desirable to adjust the intensity of the current to maintain the degree of not reaching the exhaust gas outlet 130 formed on the upper side of the combustion chamber (100).

At this time, since the strength of the electric field at each position inside the combustion chamber 100 is not the same, the moving distance to the upper side of the liquid magnet LM will be determined to correspond to the strength of the electric field at each position. Therefore, the liquid magnet LM is not even concentrated on the upper side of the combustion chamber 100 but evenly distributed inside the combustion chamber 100.

In FIG. 5, the liquid magnet LM is shown to be distributed along the position where the electric field is formed (B direction and C direction of FIG. 5), but in practice, the liquid magnet LM is distributed between the formed electric field so that the combustion chamber 100 ) Will be distributed throughout the interior.

When the power supply device 420 releases the current while the liquid magnet LM is evenly distributed inside the combustion chamber 100, the electric field for moving the liquid magnet LM to the upper side of the combustion chamber 100 disappears. LM) again moves to the lower side of the combustion chamber 100 by its own weight.

The flow of the liquid magnet LM may be formed by repetition of movement of the liquid magnet LM toward the upper side and the lower side according to the application and release of the current of the power supply device 420. This will be described later.

(2) Description of a process in which current application and blocking of the fluidized bed forming unit 400 are repeated

Referring to FIG. 6, as the current application and the interruption of the power supply device 420 are alternately repeated, the movement of the liquid magnet LM accommodated inside the combustion chamber 100 to the upper and lower sides is alternately repeated so that the liquid magnet is alternately repeated. A flow of LM is formed.

As described above, the power supply unit 420 may be provided in the form of a toggle switch capable of repeating application and release of current at predetermined time intervals. In the illustrated embodiment, the time interval between t ₁ and t ₄ is equally repeated, but the time interval may be changed according to a specific combustion state.

The constant time interval may vary depending on the target combustion amount, the flow rate and speed of the injected fuel and oxidant, the amount of the liquid magnet LM, and the like.

Thus, the same effect as the fluidization phenomenon by the fluidized bed material applied to the existing fluidized bed combustion system can be achieved by repeating the application and release of the current of the power supply 420.

In particular, in the case of the conventional fluidized bed combustion system, the fluidized bed air had to be injected above the minimum flow rate according to the physical properties such as the density of the fluidized bed material, and thus a separate device and energy were consumed, but the fluidized bed combustion according to the embodiment of the present invention. System 10 may form a fluidized bed only by applying and releasing current from power supply 420.

Although it has been described above with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims below. It will be appreciated.

10: fluidized bed combustion system
100: combustion chamber
110: fuel inlet
120: oxidant inlet
130: exhaust gas outlet
200: combustion supply
210: fuel storage unit
220: preheater
221 oxidant supply port
222: Preheat Burner
223 preheating oxidant outlet
300: exhaust gas treatment unit
310: cyclone
311: cyclone inlet
312 cyclone outlet
320: ID-Fan
321: ID-Fan inlet
322 ID-Fan outlet
330: stack
331: stack inlet
332: stack outlet
400: fluidized bed formation part
410: solenoid coil
420: power supply
LM: Liquid Magnet

Claims (10)

A combustion chamber 100 including a liquid magnet LM therein;
A solenoid coil 410 surrounding the outer surface of the combustion chamber 100; And
It includes; a power supply unit 420 for applying a current to the solenoid coil 410,
Fluidized bed combustion system.
The method of claim 1,
When a current is applied to the solenoid coil 410,
An electric field is formed in the combustion chamber 100,
The liquid magnet LM inside the combustion chamber 100 is moved corresponding to the direction of the electric field,
Fluidized bed combustion system.
The method of claim 2,
The direction of the electric field is a direction from the lower side to the upper side in the combustion chamber 100,
Fluidized bed combustion system.
The method of claim 2,
The power supply device 420 alternately repeats the application and interruption of current to the solenoid coil 410 at predetermined time intervals.
Fluidized bed combustion system.
The method of claim 3,
When the power supply unit 420 alternately repeats the application and interruption of current,
The liquid magnet LM is circulated inside the combustion chamber 100 by alternately repeating the movement upward and downward of the liquid magnet LM.
Fluidized bed combustion system.
The method of claim 1,
Wherein the liquid magnet (LM) comprises 1-butyl-3-methylimidazolium cation,
Fluidized bed combustion system.
The method of claim 1,
One side of the combustor 100 is connected in fluid communication with the preheater 220,
The other side of the combustor 100 is in fluid communication with the fuel reservoir 210,
Fluidized bed combustion system.
The method of claim 1,
The upper side of the combustor 100 is in fluid communication with the cyclone 310,
Fluidized bed combustion system.
The method of claim 8,
One side of the cyclone 310 is connected in fluid communication with an IDD-Fan (Induced Draft-Fan) 320,
One side of the ID-Fan 320 is connected in fluid communication with the stack 330,
Fluidized bed combustion system.
The method of claim 9,
The exhaust gas generated in the combustion chamber 100,
Passing through the exhaust gas outlet 130 formed on the upper side of the combustor 100, and discharged to the outside through the cyclone 310, ID-Fan 320 and the stack 330,
Fluidized bed combustion system.

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