KR20190069189A - Pressurized oxygen fuel combustion system capable of flue gas treatment and latent heat recovery - Google Patents

Abstract

A pressurized pure oxygen combustion system is a pressurized pure oxygen combustor is disclosed. More particularly, provided is a pressurized pure oxygen combustion system is a pressurized pure oxygen combustor comprising: a pressurized pure oxygen combustor (100); a fluid storage unit (200) in which exhaust gas is communicatively connected to the pressurized pure oxygen combustor (100), and fluid is accommodated therein; a preheater (300) located inside the fluid storage unit (200); and an exhaust gas flow path unit (400) positioned inside the fluid storage unit (200). The exhaust gas flow path unit (400) may include an exhaust gas inlet (410) formed at one side in fluid-communication with an outer side of the fluid storage unit (200).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurized oxygen fuel combustion system capable of flue gas treatment and latent heat recovery,

More particularly, the present invention relates to a pressurized pure oxyfuel combustion system capable of directly recovering moisture and latent heat in an exhaust gas by condensing exhaust gas generated by pressurized pure oxygen combustion with a fluid to remove harmful substances such as NOx and SOx To a pressurized oxyfuel combustion system capable of flue gas treatment and latent heat recovery.

Recently, various problems arising due to fine dust have been issued, and measures for suppressing the generation of fine dust have been actively carried out, such as stopping the operation of an aged coal-fired power plant, which is one of the main causes.

Particularly, in order to suppress the generation of fine dust when the coal-fired power plant is operated, researches for removing NOx and SOx, which are precursors of fine dust generation, from exhaust gas are actively underway.

NOx is generated by oxidizing nitrogen in the air and nitrogen components in the fuel due to combustion, and SOx is generated by oxidizing sulfur components in the fuel due to combustion.

Therefore, since exhaust gas generated after combustion contains a large amount of NOx and SOx, it is essential to remove air as it may cause air pollution and fine dust if it is discharged into the atmosphere.

Korean Patent Publication No. 10-1349493 discloses a pure oxygen combustion type vaporizer capable of supplying high-purity oxygen to a burner and collecting and storing carbon dioxide contained in the exhaust gas.

However, since this type of vaporizer can remove only the carbon dioxide contained in the exhaust gas, there is a limitation in suppressing the generation of fine dust and air pollution caused by NOx and SOx.

Korean Patent Publication No. 10-1697705 discloses a method for recovering latent heat and moisture contained in an exhaust gas to reduce white smoke and simultaneously recovering waste heat of an exhaust gas and a white smoke reducing device .

However, since this type of vaporizer is a method of spraying the hygroscopic salt solution through the hygroscopic salt solution nozzle 112, if the hygroscopic salt solution can not be sprayed to every place of the exhaust gas, the effect of reducing the white smoke may be reduced have.

Korean Patent Registration No. 10-1349493 (Apr. 1, 2014) Korean Patent Registration No. 10-1697705 (Apr. 18, 2017)

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method and apparatus for recovering latent heat through moisture condensation in exhaust gas generated during pressurized pure oxygen combustion, effectively removing SOx and NOx, The present invention provides a pressurized pure oxyfuel combustion system capable of controlling the pressurized oxygen.

To achieve the above object, the present invention provides a pressurized oxyfuel burner (100); A fluid storage part 200 communicably connected to the pressurized oxyfuel burner 100 and containing a fluid therein; A preheater 300 located inside the fluid storage part 200; And a flue gas passage part 400 located inside the fluid storage part 200. The flue gas passage part 400 is formed on one side so as to be in fluid communication with the outside of the fluid storage part 200, And an exhaust gas inlet (410) to which the exhaust gas is supplied.

In addition, the flue gas passage portion 400 includes a plate-like body portion 420; And a plurality of flue gas discharge portions 430 formed through the body portion 420.

The flue gas passage portion 400 is located below the preheater 300 and the flue gas introduced through the flue gas inlet 410 may be injected into the flue gas through the flue gas discharge portion 430.

The flow path forming member 210 may be alternately stacked on the inner side of the fluid storing part 200. The flow path forming member 210 may be disposed on the inner wall of the fluid storing part 200 and may include a plurality of through holes 212 .

A flow meter 110 provided on the flow path formed between the pressurized oxyfuel burner 100 and the fluid storage part 200; And a sensor unit 220 positioned on one side of the fluid storage unit 200. [

The fluid supply part 500 includes a fluid supply part 500 connected to the fluid storage part 200 so as to fluidly communicate with the fluid storage part 200, The amount of fluid supplied to the fluid storage part 200 may be controlled according to at least one of the sensed pH concentrations.

The pressurized oxy-fuel combustor 100 may further include a fluid recovery unit 600 fluidly connected to the fluid storage unit 200. The fluid recovered from the fluid storage unit 200 may be pressurized And may be injected into the oxygen combustor 100.

The fluid recovery unit 600 includes a tank unit 610 in which the recovered fluid is stored; A spray unit 620 for spraying the recovered fluid into the pressurized oxyfuel burner 100; And a pump unit 630 for providing a transfer force to the recovered fluid.

In addition, the pre-heater 300 is positioned to be submerged in the fluid, and a flow path through which at least one of fuel and pressurized pure oxygen flows may be formed inside the pre-heater 300.

The present invention also provides a pressurized oxyfuel burner 100; A fluid storage portion 200 communicably connected to the pressurized pure oxy-fuel combustor 100, the fluid storage portion 200 including a space portion 230 radially outwardly received therein; A preheater 300 located inside the fluid storage part 200; And a flue gas passage part 400 located in a space part 230 of the fluid storage part 200. The flue gas passage part 400 has an outer side of the fluid storage part 200 on the one side, And a flue gas inlet (410) formed in such a manner that the flue gas inlet (410) is communicatably communicable.

In addition, a plurality of inflow holes 440 are formed radially inward of the space portion 230, and the diameter of the inflow hole 440 can be reduced toward the upper side.

In addition, the exhaust gas introduced through the exhaust gas inlet port 410 may be introduced into the fluid through the inlet hole 440.

A flow meter 110 provided on the flow path formed between the pressurized oxyfuel burner 100 and the fluid storage part 200; And a sensor unit 220 positioned on one side of the fluid storage unit 200. [

The fluid supply part 500 includes a fluid supply part 500 connected to the fluid storage part 200 so as to fluidly communicate with the fluid storage part 200, The amount of fluid supplied to the fluid storage part 200 may be controlled according to at least one of the sensed pH concentrations.

The pressurized oxy-fuel combustor 100 may further include a fluid recovery unit 600 fluidly connected to the fluid storage unit 200. The fluid recovered from the fluid storage unit 200 may be pressurized And may be injected into the oxygen combustor 100.

According to the present invention, since the exhaust gas containing NO _x and SO _x is directly injected into the fluid contained in the fluid reservoir, the condensation efficiency is further improved as compared with the case where the fluid is injected into the exhaust gas.

In addition, the latent heat contained in the condensed fluid of the flue gas and the flue gas is transferred to the fuel and the pressurized oxyfuel burner through the heat exchange process with the preheater, thereby improving the combustion efficiency.

Further, since the flue gas passage portion is located at the lower side of the preheater, the heat exchange efficiency is further improved in the course of the discharged flue gas being condensed and raised in the fluid.

1 is a view showing a configuration of a pressurized pure oxyfuel combustion system according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an exhaust gas flow path included in the pressurized pure oxyfuel combustion system of FIG. 1. FIG.
Fig. 3 is a plan view of the flue gas passage portion of Fig. 2. Fig.
4 is a side view showing a fluid storage part and an exhaust gas flow path part included in a pressurized pure oxyfuel combustion system according to another embodiment of the present invention.
5 is a plan view of the fluid storage portion and the flue gas passage portion of FIG.
FIG. 6 is a view showing a change in the size of the inflow hole of the fluid storage portion of FIG. 4. FIG.

Hereinafter, a pressurized oxyfuel combustion system 10 according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Arrows indicated by dashed lines in the drawing represent flow paths of exhaust gas, and arrows indicated by solid lines represent pressurized pure oxygen and flow paths of fuel or fluid and condensation fluid.

1, a pressurized oxyfuel combustion system 10 according to an embodiment of the present invention includes a pressurized oxyfuel burner 100, a fluid storage unit 200, a preheater 300, an exhaust gas flow path unit 400, And includes a supply part 500 and a fluid recovery part 600.

1. Description of the Pressurized Oxyfire Combustor (100)

Referring to FIG. 1, a pressurized oxyfuel combustion system 10 according to an embodiment of the present invention includes a pressurized oxyfuel burner 100.

The pressurized pure oxy-fuel combustor 100 performs combustion by pressurizing the operating pressure of the combustor while using pure oxygen as an oxidizing agent, unlike a conventional combustor.

By using pure oxygen as the oxidizing agent, the pressurized pure oxy-fuel combustor 100 can reduce the amount of carbon dioxide generated due to combustion by recovering carbon dioxide (CO ₂ ) generated during the combustion, increase the temperature of the combustion chamber by the use of pure oxygen, The power generation efficiency can be increased.

For combustion by pure oxygen, the pressurized oxyfuel burner 100 may be formed of a material having a higher rigidity than a conventional combustor.

The pressurized oxyfuel combustor 100 is fluidly connected to a fluid reservoir 200 to be described below so that the exhaust gas generated in the pressurized oxyfuel combustor 100 can flow to the fluid reservoir 200.

A fluid ejection unit 620 of a fluid recovery unit 600, which will be described later, is disposed on one side of the pressurized pure oxy-fuel combustor 100, and the recovered fluid can be injected into the pressurized oxy-fuel burner 100.

The pressurized oxyfuel burner 100 includes a flow meter 110, a temperature sensor 120, a combustion supply unit 130, and a burner 140.

(1) Description of the flow meter 110

The flow meter 110 measures the flow rate of the exhaust gas generated after the combustion in the pressurized pure oxy-fuel combustor 100.

In the illustrated embodiment, the flow meter 110 is located on a flow path connecting the pressurized oxyfuel burner 100 to a fluid reservoir 200, which will be described later, and may be located at other locations where the flow rate of the flue- have.

The flow meter 110 may be provided in any form capable of measuring the flow rate of the exhaust gas flowing in the flow passage.

The flow rate measured in the flow meter 110 may be utilized to determine the amount of fluid supplied from the fluid supply part 500 to be described later. This will be described later.

(2) Description of the temperature sensor 120

The temperature sensor 120 senses the temperature inside the pressurized oxyfuel burner 100. In the illustrated embodiment, the temperature sensor 120 is provided at one side of the pressurized oxyfuel combustor 100 and may be positioned at another position capable of sensing the temperature inside the pressurized oxyfuel burner 100.

In one embodiment, the temperature sensor 120 may be equipped with an infrared temperature sensor, or may be provided in other forms capable of measuring temperature.

The temperature sensed by the temperature sensor 120 may be utilized to determine the amount of fluid re-injected into the pressurized oxyfuel burner 100 through a fluid recovery unit 600, which will be described later. This will be described later.

(3) Description of Combustion Supply Unit 130

The combustion supply unit 130 supplies at least one of pressurized pure oxygen and fuel into the pressurized oxyfuel burner 100.

The combustion supply part 130 is fluidly connected with the oxygen outlet 320 of the preheater 300, which will be described later.

Specifically, in the illustrated embodiment, the pure oxygen and the fuel are preheated through the preheater 300 located inside the fluid reservoir 200, described below, and then fed into the pressurized oxyfuel burner 100.

Therefore, since the heating process for increasing the temperature of pure oxygen and the fuel is unnecessary, the combustion efficiency can be increased.

Combustion feeder 130 is fluidly connected to pressurized oxyfuel burner 100 corresponding to the location of burner 140 described below.

(4) Description of the burner 140

The burner 140 combusts the pure oxygen and the fuel supplied to the pressurized oxyfuel burner 100 through the pure oxygen and fuel supply unit 130.

In the illustrated embodiment, the burner 140 is located below the pressurized oxyfuel burner 100 and may be located at other locations capable of burning pure oxygen and fuel.

However, it is preferable for the combustion position to be located at any position corresponding to the position of the combustion supply part 130 in order to increase the combustion efficiency.

2. Description of fluid storage 200

Referring to FIG. 1, a pressurized oxyfuel combustion system 10 according to an embodiment of the present invention includes a fluid reservoir 200.

Fluid reservoir 200 is fluidly connected to pressurized oxyfuel combustor 100 to introduce the offgas generated in pressurized oxyfuel combustor 100.

In addition, the fluid is stored in the fluid storage part 200 at a predetermined height, which may be set in consideration of various factors such as the combustion condition.

The pressurized pure oxyfuel combustion system 10 according to the embodiment of the present invention directly injects the exhaust gas generated in the pressurized oxyfuel burner 100 into the fluid.

That is, the fluid is brought into contact with the exhaust gas by injecting the exhaust gas into the fluid instead of injecting the fluid onto the exhaust gas.

Therefore, the contact area of the flue gas with the fluid is widened as compared with the case where the flue gas and the flue gas are brought into contact with each other by a method such as spraying, so that more efficient flue gas treatment is possible.

More specifically, latent heat and moisture in the exhaust gas generated by the pressurized pure oxygen combustion are condensed and recovered by the low-temperature fluid stored in the fluid storage part 200, and NO _x and SO _x in the exhaust gas are reacted with the fluid to be removed have.

At this time, since the exhaust gas is also in a pressurized state, the water solubility of NO _x and SO _x is increased, so that the reaction with water is further activated and the removal efficiency can be increased.

The inner wall of the fluid storage part 200 is preferably formed of a corrosion-resistant material. This is because corrosion of the inner wall of the fluid reservoir 200 may occur as the concentration of the fluid gradually decreases as the exhaust gas is injected directly into the fluid, as described later.

In one embodiment, the fluid may be water, it is possible to recover the latent heat and moisture inside the flue gas, reacts with the NO _X and SO _X may be provided as any other fluid capable of removing NO _X and SO _X.

In the illustrated embodiment, the fluid reservoir 200 is provided in a cylindrical shape, but may be provided in other shapes capable of fluid storage and flue gas injection.

Hereinafter, the fluid storage unit 200 according to each embodiment will be described.

(1) Description of First Embodiment

Referring to FIG. 1, the fluid storage unit 200 of the illustrated embodiment includes a flow path forming member 210, a sensor unit 220, an exhaust gas discharge unit 240, and a fluid discharge port 250.

The flue gas passage portion 400 to be described later is provided on one side of the fluid storage portion 200 so that the flue gas generated in the pressurized oxyfuel combustor 100 is introduced into the fluid storage portion 200 through the flue gas passage portion 400 Lt; RTI ID = 0.0 > fluid. ≪ / RTI >

1) Description of the flow path forming member 210

The flow path forming member 210 is sprayed inside the fluid storage part 200 so that the exhaust gas passing through the heat exchange process and the NO _x and SO _x removal processes described above is discharged through the exhaust gas discharge part 240, Thereby forming a flow path rising to the upper side of the storage unit 200.

Specifically, the flow path forming member 210 has a plurality of plate-shaped through holes 212 formed therein.

In the illustrated embodiment, the flow path forming members 210 are disposed so as to cross each other on the inner wall of the fluid reservoir 200.

In addition, a plurality of the flow path forming members 210 are alternately stacked from the lower side to the upper side of the fluid storage part 200.

Accordingly, when the flue gas injected into the fluid storage part 200 is lifted toward the flue gas discharge part 240 to be described later, the flue gas can be uniformly distributed without rushing to any side of the fluid storage part 200.

Since the flue gas flows through the plurality of through holes 212 when the flue gas flows toward the flue gas discharge unit 240 to be described later, the flue gas flows into the fluid storage unit 200 in a substantially 'S' And can be discharged to the outside.

Therefore, as will be described later, the contact area with the fluid stored in the fluid storage part 200 can be further increased, thereby increasing the water and latent heat recovery efficiency and the removal efficiency of NO _x and SO _x in the exhaust gas .

The shape of the flow path forming member 210 and the number of the through holes 212 can be changed into other shapes and numbers that can form a flow path of the exhaust gas in which the flue gas can be evenly distributed inside the fluid storing portion 2000.

2) Description of the sensor unit 220

The sensor unit 220 is provided at one side of the fluid storage unit 200 and senses the pH concentration and the temperature of the fluid stored in the fluid storage unit 200.

The sensor unit 220 may be provided in any form capable of detecting the pH concentration and the temperature. However, it is preferable to be placed in contact with the fluid stored in the fluid reservoir 200 to sense the pH concentration and the temperature of the fluid.

The pH concentration sensed by the sensor unit 220 may be utilized to determine a supply amount of the fluid supplied from the fluid supply unit 500 to be described later. This will be described later.

Also, the amount of heat exchange with the preheater 300, which will be described later, and the efficiency, etc., can be calculated using the temperature sensed by the sensor unit 220.

3) Description of exhaust gas discharge unit 240

The exhaust gas exhaust portion 240 is a process of elimination of the heat exchange process, and in the NO _X and SO _X the injected exhaust gas above the fluid reservoir 200 via the exhaust gas is flowing the flow path formed by the flow path forming member 210 And then discharged to the outside.

The flue gas discharge part 240 is formed in fluid communication with the outside of the fluid storage part 200. Alternatively, the exhaust gas discharging unit 240 may be provided with a purifier (not shown) for purifying the discharged exhaust gas.

In the illustrated embodiment, the flue gas outlet 240 is located above the fluid reservoir 200. This is because the flue gas that has undergone the heat exchange process and the process of removing NO _x and SO _{x in} the above-described heat exchanger has a low density and is lifted up, so that it is effective to discharge exhaust gas.

Alternatively, the exhaust gas discharge portion 240 can be located anywhere that exhaust gas can be smoothly discharged.

4) Description of fluid outlet 250

The fluid outlet 250 is a portion where the fluid stored in the fluid reservoir 200 is discharged to the tank unit 610 of the fluid recovery unit 600 to be described later.

The temperature of the fluid stored in the fluid storage part 200 increases as the process of heat exchange with the flue gas and the removal process of NO _x and SO _x proceeds, and the pH concentration is lowered.

At this time, if the pH concentration becomes lower than the reference value, corrosion may occur at the inner wall of the fluid storage part 200, so the used fluid must be discharged.

To this end, fluid outlet 250 is fluidly connected to fluid recovery portion 600.

In the illustrated embodiment, the fluid outlet 250 is located below the fluid reservoir 200. This is because the fluid inside the fluid storage part 200 is located at the lower side because the density of the fluid is relatively higher than that of the air and the exhaust gas.

Alternatively, the fluid outlet 250 may be located anywhere that fluid used can be smoothly discharged.

The fluid discharged through the fluid outlet 250 may be re-injected into the pressurized oxy-fuel burner 100 via a fluid recovery unit 600 to be described later, or may be discharged to the outside. A detailed description of the process will be given later .

(2) Explanation of the second embodiment

The fluid storage portion 200 of the second embodiment is slightly different in structure from the fluid storage portion 200 of the first embodiment.

Hereinafter, the fluid storage portion 200 according to the embodiment will be described with reference to FIGS. 4 to 6, focusing on the difference from the fluid storage portion 200 of the first embodiment.

The fluid storage unit 200 according to the illustrated embodiment includes a sensor unit 220, a space unit 230, an exhaust gas outlet 240, a fluid outlet 250, and a water receiving unit 260.

1) Description of the sensor unit 220

The structure and functions of the sensor unit 220 of the illustrated embodiment are the same as those of the sensor unit 220 of the first embodiment. However, it is preferable that the sensor unit 220 of the second embodiment is positioned so as to sense the temperature and the pH concentration of the fluid stored inside the hatching unit 260, which will be described later.

2) Description of the space part 230

The space part 230 forms a flow path through which the flue gas introduced through the flue gas inlet port 410 of the flue gas passage part 400 to be described later flows to be sprayed onto the fluid stored in the fluid storage part 200.

In the illustrated embodiment, the space portion 230 is formed in the longitudinal direction of the fluid storage portion 200 radially outward of the fluid storage portion 200, but may be formed in other positions at which the flow path of the exhaust gas may be formed .

The exhaust gas flowing in the space portion 230 flows into the fluid stored in the water receiving portion 260, which will be described later, through the inflow hole 440 of the flue gas passage portion 400 to be described later. A description of this process will be given later.

3) Description of exhaust gas outlet (240)

The structure and function of the exhaust gas outlet 240 of the illustrated embodiment are the same as those of the exhaust gas outlet 240 of the first embodiment.

4) Description of fluid outlet 250

The structure and function of the fluid discharge port 250 of the illustrated embodiment are the same as those of the fluid discharge port 250 of the first embodiment.

5) Description of the receiving unit 260

The water receiving portion 260 is a portion that substantially stores the fluid in the fluid storage portion 200 of the illustrated embodiment.

Specifically, the fluid storage part 200 of the illustrated embodiment is separated from the outer wall of the fluid storage part 200 by a predetermined distance from the water receiving part 260 so that the space part 230 is formed.

The fluid is filled in the water receiving portion 260 because the flue gas introduced from the inflow hole 440 of the flue gas passage portion 400 flows from the lower side to the upper side of the water receiving portion 260 And flows continuously in the height direction.

The flue gas flowing in the space portion 230 flows into the receiving portion 260 through the inflow hole 440 of the flue gas passage portion 400 to be described later, and a description of the process will be given later.

3. Description of the preheater 300

Referring to FIG. 1, a pressurized oxyfuel combustion system 10 according to an embodiment of the present invention includes a preheater 300.

The preheater 300 preheats the pressurized pure oxygen and the fuel before it is supplied to the pressurized oxyfuel burner 100 using the latent heat recovered from the exhaust gas. That is, a flow path through which at least one of the pressurized pure oxygen and the fuel flows is formed inside the pre-heater 300.

Specifically, the latent heat present in the flue gas is first transferred to the fluid in the fluid reservoir 200, and the latent heat transferred to the fluid is transferred to the pressurized pure oxygen and fuel through the preheater 300 again.

In the illustrated embodiment, the preheater 300 is provided in the shape of an 'S' shaped hot wire, and may be provided in other forms capable of heat exchange.

The material of the preheater 300 is preferably made of a material having a high thermal conductivity so as to be advantageous for heat exchange. In addition, it is preferable to be formed of a corrosion-resistant material so that corrosion does not occur in a fluid having a low pH concentration.

In the illustrated embodiment, the preheater 300 is positioned within the fluid reservoir 200 to be completely submerged in the fluid stored within the fluid reservoir 200. Alternatively, the preheater 300 may be positioned so as not to be immersed in the fluid.

However, as will be described later, the fluid storage part 200 may actively exchange heat between the fluid and the exhaust gas by injecting the exhaust gas into the stored fluid, so that latent heat is recovered from the fluid rather than recovering the latent heat from the heat- It is preferable that the preheater 300 is positioned so as to be completely immersed in the fluid.

1 and 4, the preheater 300 includes a preheating inlet 310 and a preheating outlet 320.

(1) Description of the preheating inlet 310

The preheating inlet 310 is a portion into which at least one of pure oxygen and fuel flows into the preheater 300. The preheat inlet 310 is in fluid communication with a pure oxygen feeder (not shown) and a fuel feeder (not shown), respectively.

In the illustrated embodiment, the preheat inlet 310 is located at one side of the fluid reservoir 200 adjacent to the preheat outlet 320, which will be described later, and its position can be varied corresponding to the location of the preheater 300 .

Only the pure oxygen may be introduced into the preheating inlet 310, only the fuel may be introduced, or a mixture of pure oxygen and fuel may be introduced.

In any case, since the inflow fluid passes through a heat exchange process with the fluid through the preheater 300, it can be supplied to the pressurized oxyfuel burner 100 in a preheated state, and the combustion efficiency can be increased.

(2) Description of the preheat outlet 320

The preheating outlet 320 is a portion through which at least one of pure oxygen and fuel introduced into the preheater 300 is discharged. It is a matter of course that the fluid discharged through the preheating outlet 320 is determined according to the fluid introduced into the preheating inlet 310 described above.

The preheat outlet 320 is in fluid communication with the combustion feed 130 of the pressurized oxyfuel burner 100.

In the illustrated embodiment, the preheat outlet 320 is located at one side of the fluid reservoir 200 adjacent the preheat inlet 310, and the location thereof is changeable corresponding to the location of the preheater 300.

The pressurized pure oxygen and the fuel preheated through the preheating outlet 320 are transferred to the combustion supply part 130 of the pressurized oxyfuel burner 100 so that the combustion efficiency of the pressurized oxyfuel burner 100 can be increased.

4. Description of the flue gas passage portion 400

Referring to FIG. 1, a pressurized oxyfuel combustion system 10 according to an embodiment of the present invention includes an exhaust gas flow path unit 400.

The flue gas passage unit 400 is configured to allow the flue gas generated in the pressurized oxyfuel burner 100 to be directly injected into the fluid stored in the fluid storage unit 200 and to discharge the flue gas into the fluid storage unit 200 do.

As described above, the fluid storage unit 200 according to the embodiment of the present invention can be provided in two forms, and the shape and configuration of the flue gas passage unit 400 can be changed accordingly.

Hereinafter, the exhaust gas passage unit 400 according to each embodiment will be described in detail with reference to FIGS. 2 to 6. FIG.

(1) Description of First Embodiment

2 and 3, the exhaust gas passage portion 400 of the illustrated embodiment includes an exhaust gas inlet 410, a body portion 420, and an exhaust gas discharge portion 430.

In the illustrated embodiment, the flue gas passage portion 400 is accommodated in the lower side of the fluid storage portion 200 so as to be completely immersed in the fluid stored inside the fluid storage portion 200, It can be changed to other positions that can be locked in fluid.

1) Description of the flue gas inlet 410

The exhaust gas inlet port 410 is a portion into which exhaust gas generated in the pressurized oxy-fuel burner 100 flows. Flue gas inlet 410 is fluidly connected to pressurized oxyfuel burner 100 and fluid reservoir 200.

More specifically, the pressurized pure oxy-fuel combustor 100, the fluid storage unit 200, and the flue gas inlet 410 are connected to the flue gas inlet 410 of the pressurized oxy-fuel combustor 100, Such that they can be flowed into the fluid channel.

The flue gas inlet 410 is formed so that its width gradually widens from its end toward a body 420 to be described later. This is because the cross section of the flue gas inlet 410 is widened to reduce the flow velocity of the flue gas flowing inside the flue gas inlet 410 so that the flue gas can be effectively discharged from the flue gas discharge portion 430 to be described later.

Alternatively, the exhaust gas inlet 410 may be formed so that its cross-sectional area is constant.

The flue gas introduced into the flue gas inlet 410 is transferred to the body 420 to be described later.

2) Description of the body part 420

The body part 420 is a part forming the body of the flue gas passage part 400 for injecting the flue gas introduced into the flue gas inlet 410 into the fluid stored in the fluid storage part 200.

The interior of the body portion 420 is fluidly connected to the interior of the flue gas inlet 410.

In the illustrated embodiment, the body portion 420 is in the form of a plate so that the exhaust gas is evenly discharged in the up-and-down direction of the fluid storage portion 200 and uniformly sprayed onto the fluid stored in the fluid storage portion 200.

The shape of the body portion 420 may be any other shape capable of uniformly injecting the flue gas.

A plurality of exhaust gas discharge portions 430 are formed through the body portion 420. This will be described later.

3) Description of exhaust gas discharging portion 430

The exhaust gas discharge portion 430 is a portion in which exhaust gas having passed through the exhaust gas inlet port 410 and the body portion 420 is discharged into the fluid contained in the fluid storage portion 200.

In the illustrated embodiment, a plurality of exhaust gas discharge portions 430 are formed in a circular shape passing through the body portion 420 in the up and down direction, but may be provided in other shapes and directions capable of discharging the exhaust gas.

In the illustrated embodiment, the exhaust gas discharge portions 430 are arranged in a grid shape, but they can be arranged in other ways.

The exhaust gas flowing into the body portion 420 may be discharged in the vertical direction of the body portion 420 through the exhaust gas discharge portion 430 and may be injected into the fluid.

(2) Explanation of the second embodiment

The exhaust gas passage portion 400 of the second embodiment is slightly different from the structure of the exhaust gas passage portion 400 of the first embodiment, which is caused by the difference between the fluid storage portions 200 of the above-described embodiments.

4 to 6, the flue gas passage portion 400 of the second embodiment will be described focusing on the difference from the flue gas passage portion 400 of the first embodiment.

The exhaust gas flow passage 400 according to the illustrated embodiment includes an exhaust gas inlet 410 and an inlet hole 440.

1) Description of the flue gas inlet 410

The structure and function of the exhaust gas inlet 410 of the illustrated embodiment are the same as those of the exhaust gas inlet 410 of the first embodiment.

2) Description of inflow hole 440

The inflow hole 440 is a portion where the exhaust gas flowing in the space portion 230 of the fluid storage portion 200 of the second embodiment flows into the fluid stored radially inward of the space portion 230. The inflow hole 440 fluidly connects the reservoir portion 260 of the fluid reservoir 200 with the reservoir portion 260.

In the illustrated embodiment, the inflow hole 440 is circular, and is spaced a predetermined distance in the circumferential direction and the height direction of the outer wall of the water receiving portion 260 and is repeatedly formed. The shape and forming position of the inflow hole 440 can be changed.

In this case, the structure of the inflow hole 440 is such that the flue gas is injected from the space portion 230 into the water receiving portion 260, but the fluid is not introduced into the space portion 230 from the water receiving portion 260 desirable.

More specifically, in consideration of the pressure of the exhaust gas and the viscosity of the fluid, only the exhaust gas can flow from the space portion 230 toward the water receiving portion 260.

It is preferable that the diameter of the inflow hole 440 gradually decreases from the space portion 230 to the water receiving portion 260. This is to realize the orifice shape of the inflow hole 440 and maximize the injection effect by increasing the flow velocity of the flue gas from the space portion 230 toward the water receiving portion 260.

It is preferable that the diameter of the inflow hole 440 gradually decreases from the lower side to the upper side of the water receiving portion 260. This is to increase the pressure drop toward the upper side of the hatching section 260 so as to flow into the hatching section 260 through the inflow hole 440 located below the hatching section 260 so as to be an exhaust gas to be.

When the flue gas flows through the inflow hole 440 located below the water receiving portion 260, the contact time of the flue gas with the fluid increases in the course of the flue gas ascending to the upper side of the receiving portion 260 due to the density difference , Heat exchange and removal effects of NO _x and SO _x are increased.

5. Description of Fluid Supply Unit 500

Referring to FIG. 1, a pressurized oxyfuel combustion system 10 according to an embodiment of the present invention includes a fluid supply unit 500.

The fluid supply part (500) supplies fluid to the fluid storage part (200). To this end, fluid supply 500 is fluidly connected to fluid reservoir 200. In the case of the second embodiment, the fluid supply part 500 may be fluidly connected to the receiving part 260 of the fluid storage part 200.

The amount of fluid supplied from the fluid supply part 500 to the fluid storage part 200 may be determined according to at least one of the pH concentration of the fluid and the temperature of the exhaust gas.

Specifically, the fluid contained in the fluid storage part 200 is continuously dissolved in SO _x and NO _x contained in the exhaust gas, and the pH concentration is lowered. In this case, even if the pH concentration of the fluid drops below the reference pH concentration, if SO _x and NO _x are continuously dissolved and further lowered, the inner wall of the fluid storage part 200 or the water receiving part 260 and the pre- There is a risk of corrosion.

Therefore, when the pH concentration sensed by the sensor unit 220 of the fluid storage unit 200 drops below the reference pH concentration, if the fluid is discharged through the fluid outlet 250, The fluid is supplied from the fluid reservoir 500 to the fluid reservoir 200.

A flow meter (not shown) may be provided between the rapier discharge port 250 and the fluid supply part 500 and the flow path of the fluid storage part 200 to calculate an accurate supply amount.

In addition, the amount of fluid supplied from the fluid supply part 500 may be adjusted corresponding to the temperature of the exhaust gas generated in the pressurized oxyfuel burner 100.

Specifically, when the temperature of the exhaust gas measured by the temperature sensor 120 is higher than the reference temperature, since the amount of fluid required to cool the exhaust gas and recover the latent heat in the exhaust gas will increase, The amount of the fluid supplied to the unit 200 can be increased.

Also, the amount of fluid supplied from the fluid supply part 500 can be determined according to the flow rate of the exhaust gas detected by the flow meter 110.

As described above, the exhaust gas flows into the fluid reservoir 200 and reacts with the fluid contained in the fluid reservoir 200.

At this time, when the amount of the exhaust gas exceeds the amount of the accommodated fluid to be reacted, the reaction of the flue-gas with the fluid will be lowered, so that the amount of the fluid re-supplied into the fluid storage portion 200 is also increased desirable.

Further, when the amount of the exhaust gas is significantly smaller than the amount of the stored fluid to be reacted, the amount of the fluid discharged after the reaction with the flue gas will decrease, Is also preferably reduced.

The reference flow rate of the exhaust gas for regulating the amount of the fluid re-supplied into the fluid reservoir 200 may be determined by various factors such as the combustion condition.

6. Description of the fluid recovery unit 600

Referring to FIG. 1, a pressurized oxyfuel combustion system 10 according to an embodiment of the present invention includes a fluid recovery unit 600.

The fluid recovery unit 600 stores the fluid discharged through the fluid outlet 250 of the fluid storage unit 200 and injects the fluid into the pressurized oxyfuel burner 100 or discharges the fluid to the outside.

The fluid recovery unit 600 includes a tank unit 610, a jetting unit 620, and a pump unit 630.

(1) Description of the tank unit 610

The tank unit 610 stores the fluid discharged through the fluid outlet 250 of the fluid reservoir 200. Specifically, a fluid (hereinafter referred to as "recovered fluid") in which the pH concentration is lowered due to continuous dissolution of the exhaust gas is stored.

In order to receive the recovered fluid, the tank unit 610 is fluidly connected to the fluid outlet 250.

The recovered fluid stored in the tank unit 610 may be injected into the pressurized oxyfuel burner 10 by a jetting unit 620 to be described later. To this end, the tank unit 610 is fluidly connected to the injection unit 620.

In addition, when the temperature or pH concentration of the recovered fluid is not suitable for re-injection into the pressurized oxyfuel burner 10, the recovered fluid stored in the tank unit 610 may be discharged to the outside through a reprocessing process.

To this end, the tank unit 610 may further include a reprocessing unit (not shown) and a discharge unit (not shown) for reprocessing the recovered fluid.

The inner wall of the tank unit 610 is preferably formed of a corrosion resistant material so as not to be corroded and damaged by the recovered fluid having a low pH concentration.

(2) Explanation of the injection unit 620

The injection unit 620 re-injects the recovered fluid stored in the tank unit 610 into the pressurized oxyfuel burner 10. For this purpose, the injection unit 620 is fluidly connected to the tank unit 610. [

In one embodiment, the injection unit 620 may be provided in the form of a nozzle or spray, or may be provided with other structures capable of injecting the recovered fluid into the pressurized oxyfuel burner 10.

It is preferable that the inner wall of the injection unit 620 is formed of a corrosion-resistant material so as not to be corroded and damaged by the recovered fluid having a low pH concentration.

The recovered fluid is injected into the pressurized pure oxy-fuel combustor 10 so that the temperature inside the pressurized pure oxy-fuel burner 10 is controlled and the latent heat of evaporation generated after the burning can be recovered from the fluid storage part 200 again. A detailed description of this process will be given later.

(3) Description of the pump unit 630

The pump unit 630 provides a transfer force that allows the recovered fluid stored in the tank unit 610 to be transferred to the injection unit 620. To this end, the pump unit 630 may be located on the flow path of the tank unit 610 and the injection unit 620.

The pump unit 630 is provided with any structure capable of providing a transfer force that allows the recovered fluid stored in the tank unit 610 to be transferred to the injection unit 620, Can also be located.

It is preferable that the inner wall of the pump unit 630 is formed of a corrosion-resistant material so as not to be corroded and damaged by the recovered fluid having a low pH concentration.

7. Explanation of flue gas treatment process in pressurized oxy-fuel combustor

The pressurized pure oxyfuel combustion system 10 according to the embodiment of the present invention can recover the latent heat included in the exhaust gas generated in the pressurized pure oxygen combustion process and preheat the pressurized pure oxygen and the fuel used as the oxidant.

Also, removed by dissolving the SO _X and NO _X contained in the exhaust gas to a fluid and discharge it is possible to prevent air pollution.

In addition, the temperature inside the pressurized pure oxy-fuel combustor 10 can be prevented from rising beyond the reference value by collecting the fluid in which SO _X and NO _X are dissolved and re-injecting the pressurized oxygen into the pressurized oxy-fuel combustor 10. Therefore, it is possible to prevent the problem of thermal deformation of the pressurized pure oxy-fuel combustor 10 due to the high temperature exceeding the reference value and the occurrence of thermal fatigue problems.

Hereinafter, an exhaust gas treatment process in a pressurized oxyfuel burner by the pressurized pure oxyfuel combustion system 10 according to an embodiment of the present invention will be described with reference to FIG.

Pressurized pure oxygen and fuel, which are oxidants, are supplied into the pressurized pure oxy-fuel combustor 10, and are ignited by the burner 140 to cause combustion.

At this time, the temperature inside the pressurized pure oxy-fuel combustor 10 is sensed by the temperature sensor 120 in real time.

The flue gas generated after the combustion flows to the fluid reservoir 200. At this time, the flow meter 110 located on the flow path of the pressurized pure oxy-fuel combustor 10 and the fluid storage part 200 senses the flow rate of the flowing exhaust gas in real time.

The flue gas reaching the fluid storage part 200 flows into the flue gas passage part 400 through the flue gas inlet 410 located inside the fluid storage part 200.

 In the case of the fluid storage part 200 according to the first embodiment of the present invention, the exhaust gas flows through the exhaust part 420 of the flue gas passage part 400 through the flue gas discharge part 430 in the vertical direction of the fluid storage part 200, And is directly injected into the fluid stored in the storage unit 200. [

In the case of the fluid storage unit 200 according to the second embodiment, after the flue gas flows along the space portion 230 of the fluid storage portion 200, the fluid stored in the water receiving portion 260 through the inflow hole 440 Lt; / RTI >

The moisture contained in the flue gas is condensed and recovered in the moisture stored in the fluid storage part 200, and the latent heat contained in the flue gas is recovered by heat exchange with the fluid.

Further, at least one of the pressurized pure oxygen and the fuel, which is an oxidant, flows into the preheating inlet 310 of the preheater 300 and is heat-exchanged with the latent heat recovered by the fluid to raise the temperature and then discharged through the preheat outlet 320 And is supplied to the pressurized oxyfuel burner 100 through the post-combustion feeder 130.

SO _x and NO _x contained in the exhaust gas are dissolved and removed in the fluid stored in the fluid reservoir 200. SO a fluid continuous furnace pH concentration is lowered than the standard pH level in the _X and NO _X is returned to the fluid recovery unit 600 through the fluid outlet (250).

SO _X and NO _X are removed off-gas is raised inside the fluid storing portion 200 by the density difference between the fluids.

At this time, the fluid storage part 200 according to the first embodiment forms a flow path of the exhaust gas by alternately stacking a plurality of flow path forming members on the inner side, so that the exhaust gas is uniformly distributed in the fluid storage part 200.

The flue gas reaching the upper side of the fluid storage part 200 is discharged to the outside of the fluid storage part 200 through the flue gas outlet 240.

The fluid recovered in the fluid recovery section 600 is determined depending on the pH concentration or the temperature to determine whether the fluid is to be discharged or re-sprayed. If it is not suitable for re-injection, the recovered fluid is discharged to the outside through a reprocessing process.

When it is suitable for re-injection, the recovered fluid is fed by the pump unit 630 and injected into the pressurized oxy-fuel combustor 100 by the injection unit 620.

The fluid supply unit 500 may be configured to measure the flow rate of the exhaust gas detected by the flow meter 110, the temperature inside the pressurized oxyfuel combustor 100 sensed by the temperature sensor 120, And the temperature of the fluid to be supplied to the fluid storage part 200 and supplies the fluid.

Therefore, the pressurized pure oxyfuel combustion system 10 according to the embodiment of the present invention can recover the latent heat contained in the exhaust gas generated after combustion, preheat the pressurized pure oxygen and the fuel, so that the combustion efficiency is increased.

Further, the water contained in the flue gas can be condensed and recovered in the fluid, so that the supply amount of the flue gas for the flue gas treatment can be reduced.

In addition, since the exhaust gas removes the SO _X and NO _X contained in the exhaust gas in such a manner as to direct injection into the fluid, it is possible to more effectively remove the SO _X and NO _X compared to the method for injecting a fluid into the exhaust gas.

Further, the SO _X and NO _X are dissolved, so to control the temperature inside by spraying to the pH levels recovered lower liquid material inside the pressurized pure oxygen burner 100, pressure pure oxygen combustor 100 below the existing temperature, whereby It is possible to suppress occurrence of problems due to high temperature such as thermal deformation and thermal fatigue.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that it is possible.

10: Pressurized Oxyfuel Combustion System
100: Pressurized oxyfuel combustor
110: Flowmeter
120: Temperature sensor
130: Combustion supply part
140: Burner
200: fluid storage part
210: passage forming member
212: Through hole
220:
230:
240: exhaust gas outlet
250: fluid outlet
260:
300: preheater
310: preheating inlet
320: Preheating outlet
400: Flue gas flow path
410: Flue gas inlet
420:
430: Flue gas discharge portion
440: Inflow ball
500: fluid supply part
600:
610: Tank unit
620: injection unit
630: Pump unit

Claims (15)

A pressurized oxyfuel burner 100;
A fluid storage part 200 communicably connected to the pressurized oxyfuel burner 100 and containing a fluid therein;
A preheater 300 located inside the fluid storage part 200; And
And a flue gas passage part 400 located inside the fluid storage part 200,
The exhaust gas flow path portion 400 includes:
And an exhaust gas inlet (410) formed at one side in fluid communication with the outside of the fluid reservoir (200).
Pressurized Oxyfuel Combustion System.
The method according to claim 1,
The exhaust gas flow path portion 400 includes:
A plate-shaped body portion 420; And
And a plurality of exhaust gas discharge portions 430 formed through the body portion 420,
Pressurized Oxyfuel Combustion System.
3. The method of claim 2,
The exhaust gas passage portion 400 is located below the preheater 300,
The exhaust gas introduced through the exhaust gas inlet (410) is injected into the fluid through the exhaust gas discharge portion (430)
Pressurized Oxyfuel Combustion System.
The method of claim 3,
On the inner side of the fluid storage part 200,
And a flow path forming member 210 which is located on the inner wall of the fluid storage part 200 and includes a plurality of through holes 212,
Pressurized Oxyfuel Combustion System.
The method of claim 3,
A flow meter 110 provided on a flow path formed between the pressurized oxyfuel burner 100 and the fluid storage part 200; And
Further comprising a sensor portion (220) located on one side of the fluid reservoir (200)
Pressurized Oxyfuel Combustion System.
6. The method of claim 5,
And a fluid supply (500) fluidly connected to the fluid reservoir (200)
The fluid supply part (500)
Wherein an amount of fluid supplied to the fluid storage part (200) is controlled according to at least one of a flow rate sensed by the flow meter (110) and a pH concentration sensed by the sensor part (220)
Pressurized Oxyfuel Combustion System.
The method according to claim 1,
And a fluid recovery unit (600) fluidly connected to the pressurized oxyfuel burner (100) and the fluid reservoir (200)
The fluid recovered in the fluid storage part (200) is injected into the pressurized oxyfuel burner (100)
Pressurized Oxyfuel Combustion System.
8. The method of claim 7,
The fluid recovery unit (600)
A tank unit (610) in which the recovered fluid is stored;
A spray unit 620 for spraying the recovered fluid into the pressurized oxyfuel burner 100; And
And a pump unit (630) for providing a transfer force to the recovered fluid.
Pressurized Oxyfuel Combustion System.
The method according to claim 1,
The preheater 300 is positioned to be submerged in the fluid,
In the preheater 300, a flow path through which at least one of fuel and pressurized pure oxygen flows is formed.
Pressurized Oxyfuel Combustion System.
A pressurized oxyfuel burner 100;
A fluid storage portion 200 communicably connected to the pressurized pure oxy-fuel combustor 100, the fluid storage portion 200 including a space portion 230 radially outwardly received therein;
A preheater 300 located inside the fluid storage part 200; And
And a flue gas passage part (400) located in the space part (230) of the fluid storage part (200)
The exhaust gas flow path portion 400 includes:
And an exhaust gas inlet (410) formed at one side of the fluid storage part (200)
Pressurized Oxyfuel Combustion System.
11. The method of claim 10,
A plurality of inflow holes 440 are formed radially inward of the space 230,
The diameter of the inflow hole 440 decreases toward the upper side,
Pressurized Oxyfuel Combustion System.
12. The method of claim 11,
The exhaust gas introduced through the exhaust gas inlet port 410 flows into the fluid through the inlet hole 440,
Pressurized Oxyfuel Combustion System.
13. The method of claim 12,
A flow meter 110 provided on a flow path formed between the pressurized oxyfuel burner 100 and the fluid storage part 200; And
Further comprising a sensor portion (220) located on one side of the fluid reservoir (200)
Pressurized Oxyfuel Combustion System.
14. The method of claim 13,
And a fluid supply (500) fluidly connected to the fluid reservoir (200)
The fluid supply part (500)
Wherein an amount of fluid supplied to the fluid storage part (200) is controlled according to at least one of a flow rate sensed by the flow meter (110) and a pH concentration sensed by the sensor part (220)
Pressurized Oxyfuel Combustion System.
11. The method of claim 10,
And a fluid recovery unit (600) fluidly connected to the pressurized oxyfuel burner (100) and the fluid reservoir (200)
The fluid recovered in the fluid storage part (200) is injected into the pressurized oxyfuel burner (100)
Pressurized Oxyfuel Combustion System.

Images