KR101145934B1 - Waste heat recycling system with combustion chamber lower hopper heat-exchanger and cooling water circulation device - Google Patents

Abstract

PURPOSE: A heat recycling system having a heat exchanger of a lower hopper and a fluid sand cooler of a fluidized bed combustor is provided to improve the efficiency of cooling fluid sand and steam production because high-temperature combustion air is converted into steam of cooling water. CONSTITUTION: A waste heat recycling system comprises a combustion chamber(2), a heat exchanger(10), a gas air heater(80), a combustion air feeding unit(150), and a fluid sand cooling device. The combustion chamber burns wood chips and biomass and fluidizes the fluid sand. The heat exchanger inhales heat and discharges the heated air while moving the combustion air through a first duct(4). The gas air heater moves high-temperature combustion air discharged from the heat exchanger to a second duct(6) and inhales waste heat and heats air. The combustion air feeding unit feeds high-temperature combustion air of the gas air heater through a third duct(8) to the combustion chamber. The fluid sand cooling device moves the cooling water, thereby generating steam in a steam drum(160) by cooling overheated fluid sand.

Description

WASTE HEAT RECYCLING SYSTEM WITH COMBUSTION CHAMBER LOWER HOPPER HEAT-EXCHANGER AND COOLING WATER CIRCULATION DEVICE}

The present invention relates to a waste heat recycling system having a combustion chamber lower hopper heat exchanger and a fluid yarn cooling device. More particularly, the combustion air supply tube is arranged in a double layer fluidized bed combustion chamber lower hopper to heat exchange the high temperature fluidized yarn heat. Improves the cooling efficiency of the lower hopper, and inputs the high temperature combustion air from the gas air heater into the combustion chamber, converts the cooling water introduced into the combustion chamber into some steam, and supplies it to the steam drum to improve the steam production efficiency along with the cooling of the flowing yarn. It relates to a waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooling device.

In general, a fluidized bed combustion chamber boiler facility, which is recently adopted in a waste heat recovery facility or a waste heat recovery boiler such as a solid fuel and a biomass combustion boiler, produces steam by heating water using hot exhaust gas heat generated in a combustion chamber.

This fluidized bed combustion chamber boiler is equipped with a high rising air flow and fuel by supplying the high calorific value of solid fuel and biomass injected for combustion from the outside to the fluid sand provided in the fluidized bed combustion chamber. Combustion occurs under complex conditions due to mixing and extreme turbulence.

In terms of combustion, it has the advantage of high combustion efficiency using high calorific value of more than 3,000 Kcal / kg such as the current solid fuel (RDF, Wood Chip) and Bio mass. This causes an increase in the amount of heat dissipated into the fluidized bed combustor and the bottom of the incinerator, a problem of severe heat deformation of the discharge device, and at the same time, the flow sand and the incombustibles discharged into the lower hopper of the combustion chamber. The high temperature is discharged at a high temperature, it is necessary to use an expensive re-extracting device made of high-quality materials, or a water-cooling device to prepare for high heat.

In addition, the conventional method is to maximize the steam production in preparation for the limited solid fuel and biomass supply as the fluidized bed combustion chamber boiler facility operating for steam production does not actively recover the waste heat discharged to the outside. The problem is that you can't.

In addition, the demand for the production of more steam has led to an increase in the load of the boiler plant at the steam requirements, and when the combustion chamber is operated at a high temperature to increase the amount of steam generated in the fluidized bed combustion chamber boiler plant, the flow inside the combustion chamber even if sprayed with cooling water Saga could not fundamentally solve the problem of melting due to high temperature.

In addition, there is another method of performing natural cooling at room temperature by circulating high-temperature flow yarn, but also heat is discharged from the high-temperature flow yarn, so heat cannot be recovered, thereby increasing the loss of boiler equipment. Therefore, there is a need for improvement.

On the other hand, the invention for a fluidized bed combustion furnace that can be applied to the existing waste heat recovery facility or solid fuel (RDF) and biomass combustion boiler, etc. has been proposed as the Patent Publication No. 2003-0058411.

 The present invention has been created by the necessity as described above, through the heat transfer of the flow yarn is discharged by arranging the combustion air supply tube penetrated in the lower hopper of the fluidized bed combustion chamber of the dual structure to increase the cooling efficiency of the lower hopper, and through the gas air heater It is equipped with a combustion chamber lower hopper heat exchanger and a fluid yarn cooling device that improves steam production efficiency by flowing steam cooling by inputting high temperature combustion air into the combustion chamber, converting and discharging the cooling water introduced into the combustion chamber into a partial steam and supplying it to the steam drum. It is an object to provide a waste heat recycling system.

In addition, the present invention, by placing at least one diaphragm in the space portion consisting of the inner hopper and the outer hopper in the lower hopper to circulate the low temperature combustion air to increase the temperature of the high temperature combustion air to supply to the combustion chamber to prevent low temperature corrosion of the equipment, It is an object of the present invention to provide a waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooling device which prevents melting of the flow yarn and increases flow efficiency of the flow yarn.

In addition, the present invention allows the shape of the combustion air supply tube disposed in the combustion chamber lower hopper can be designed in various shapes such as square, circle, ellipse, triangular, etc., combustion chamber lower hopper heat exchanger that can maximize the waste heat recovery of high temperature atmosphere It is an object of the present invention to provide a waste heat recycling system having a cooling yarn cooling device.

According to the present invention, a plurality of cooling tubes are arranged on one side in a longitudinal direction of the supply header and the discharge header in an up and down state, and each cooling tube is evenly arranged up and down in the combustion chamber to connect each other. It is an object of the present invention to provide a waste heat recycling system equipped with a combustion chamber lower hopper heat exchanger and a flowing yarn cooling system that maximizes cooling efficiency.

In addition, the present invention receives the steam and high temperature cooling water supplied from the outside in a heat exchanger formed inside the steam drum to produce additional steam, It is an object of the present invention to provide a waste heat recycling system having a combustion chamber lower hopper heat exchanger having an excellent heat exchange structure and a flow yarn cooling device because the cooling water supplemented from the outside is circulated.

In order to achieve the above object, a waste heat recycling system including a combustion chamber lower hopper heat exchanger and a fluid sand cooling device according to an embodiment of the present invention includes a combustion chamber in which solid fuel or biomass is combusted and fluidized in a fluid sand; A heat exchanger provided in the lower hopper below the combustion chamber and discharging the introduced combustion air through a first pipe to discharge heat in a state of being heated up; A gas air heater provided in the waste heat discharge path of the combustion chamber and moving the high temperature combustion air discharged from the heat exchanger to a second pipe to absorb the waste heat and heat up; Combustion air supply unit for supplying the high temperature combustion air of the gas air heater to the combustion chamber through a third pipe; And a flow yarn cooling device disposed above the combustion air supply unit and configured to produce steam in a steam drum while moving a coolant to cool superheated flow yarns, wherein the lower hopper of the heat exchanger is provided under the combustion chamber. Inner hopper discharged; And it characterized in that it comprises an outer hopper disposed to have a space portion on the outside of the inner hopper.

In addition, the first pipe line is provided with a steam heat exchanger to warm up when the temperature of the combustion air supplied to the lower hopper is low, and the third pipe line is the initial temperature of the combustion air supplied to the combustion chamber when the waste heat recycling system is operated. It is characterized in that the hot stove to increase the temperature.

In addition, the waste heat discharge path is provided above the gas air heater. It is characterized in that it further comprises a coal mill for heating the water supplied from the outside to supply the steam drum.

In addition, the heat exchange apparatus, the combustion air inlet is provided in the lower portion of the outer hopper to inject the low-temperature combustion air into the space portion; A combustion air outlet provided at an upper portion of the outer hopper to discharge high-temperature combustion air from the space part; And a temperature rising part configured to discharge the combustion air introduced into the combustion air inlet through the circulation path and discharge the heat from the lower hopper to the combustion air outlet in a heated state.

In addition, the lower hopper is provided with a blocking member for connecting the upper end of the inner hopper and the outer hopper to block the upper open portion of the space portion, characterized in that the combustion air outlet is provided on the opposite side of the combustion air inlet. .

In addition, the temperature rising unit, the space portion of the lower hopper partitioned into upper and lower layers, a plurality of edge-shaped diaphragm provided between the combustion air inlet and the combustion air outlet; A plurality of combustion air supply tubes provided in the inner hopper and disposed to pass through the combustion air from one side to the other side; And an opening provided in the diaphragm so that the combustion air introduced into the combustion air inlet moves zigzag through the space and the combustion air supply tube.

In addition, the diaphragm, the lower plate which is provided on the upper side of the combustion air inlet to partition the space portion; And an upper plate disposed above the lower plate and below the combustion air outlet to partition the space.

In addition, the opening portion is provided on the lower plate, but the first opening is formed on the opposite side of the combustion air intake; And a second open part provided on the upper plate and formed on an opposite side of the first open part and the combustion air outlet.

In addition, the combustion air supply tube, the plurality of horizontally arranged in the inner hopper and arranged in a plurality of layers up and down, the combustion air supply tube adjacent to the up and down are arranged to be offset from each other, the combustion air supply tube is The cross section is provided in at least one of a circle, a square, an ellipse, a triangle, and the combustion air supply tube is a rectangular cross section, characterized in that the corner is arranged up and down to facilitate the discharge of the incombustibles and the flow yarn.

The combustion air supply unit, a plurality of diffuser header is connected to the inside from the outside of the combustion chamber and the air is supplied; A connection pipe positioned around the combustion chamber to supply air to the plurality of diffuser headers and connected to the third pipe path; And a plurality of diffuser nozzles mounted on the diffuser header to inject air.

The flow yarn cooling apparatus may further include: a cooling tube to which a coolant moves to cool the overheated flow yarn of the combustion chamber; A supply header disposed separately in the combustion chamber and supplying the cooling water introduced into the inlet pipe to the cooling tube; A discharge header disposed separately in the combustion chamber and discharging steam and hot coolant absorbing the heat of the flow yarn from the cooling tube to be transferred to the supply pipe; And a heat exchanger receiving steam and hot coolant from the supply pipe to produce additional steam in the steam drum, and discharging the cold coolant supplemented from the outside in the steam drum to the inlet pipe.

In addition, the cooling tubes are interconnected in a zigzag shape in the combustion chamber in a state in which the discharge header is disposed above the supply header, and a plurality of the cooling tubes are arranged on one side in a longitudinal direction of the supply header and the discharge header. It is characterized in that the cooling tubes are evenly arranged up and down.

In addition, the supply header and the discharge header is a cylindrical shape is formed in the same shape and the same size, the outer circumferential surface of the cooling tube is characterized by forming a nickel chromium coating layer of 3 ~ 7mm thickness to withstand the wear caused by the flow of the flow yarn It is done.

The heat exchange part may include a steam discharge header connected to the supply pipe to supply steam and hot water into the steam drum, and one end of which is blocked; A plurality of discharge members connected to an upper side of the steam discharge header to discharge steam and hot coolant into the steam drum; A coolant inlet header disposed at the periphery of the steam discharge header and connected to the inlet pipe and having one end closed to suck the coolant replenished from the outside of the steam drum; And a suction member connected to the lower side of the cooling water inflow header and sucking the cooling water supplemented from the outside in the lower part of the steam drum.

In addition, the discharge member and the suction member is arranged to cross each other at a mutually set interval (D) in a horizontal arrangement, the discharge member and the suction member are formed on the upper and lower sides of the steam discharge header and the cooling water inlet header, respectively It is characterized in that the hole or a tube member mounted in the hole.

In addition, the steam discharge header and the coolant inlet header is disposed below the radial line of the steam drum, the steam discharge header is characterized in that located at a higher position than the coolant inlet header.

As described above, the waste heat recycling system including the combustion chamber lower hopper heat exchanger and the fluid yarn cooling device according to the present invention is configured to discharge the flow yarn heat discharged by passing the combustion air supply tube through a double-bed fluidized bed combustion chamber lower hopper. The heat exchanger improves the cooling efficiency of the lower hopper, and inputs the high temperature combustion air passed through the gas air heater into the combustion chamber, converts the cooling water introduced into the combustion chamber into some steam, and supplies it to the steam drum to improve the steam production efficiency along with the cooling of the flowing yarn. Can be improved.

In addition, the present invention, by placing at least one diaphragm in the space portion consisting of the inner hopper and the outer hopper in the lower hopper to circulate the low temperature combustion air to increase the temperature of the high temperature combustion air to supply to the combustion chamber to prevent low temperature corrosion of the equipment, Melting of the flow yarn is prevented, and the flow efficiency of the flow yarn can be increased.

In addition, the present invention can be designed in a variety of shapes, such as square, circle, ellipse, triangular, etc. of the combustion air supply tube disposed in the lower hopper of the combustion chamber to maximize the waste heat recovery in the high temperature atmosphere.

According to the present invention, a plurality of cooling tubes are arranged on one side in a longitudinal direction of the supply header and the discharge header in an up and down state, and each cooling tube is evenly arranged up and down in the combustion chamber to connect each other. Increase the cooling efficiency.

In addition, the present invention receives the steam and high temperature cooling water supplied from the outside in a heat exchanger formed inside the steam drum to produce additional steam, Since the cooling water replenished from the outside is circulated, it is possible to provide an excellent heat exchange structure.

1 is a schematic diagram of a waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooling device according to an embodiment of the present invention.
Figure 2 is a front sectional view showing a combustion chamber lower hopper heat exchanger and a flow yarn cooling device according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of the configuration viewed in a direction perpendicular to FIG. 2. FIG.
4 is an exploded perspective view of a heat exchanger according to an embodiment of the present invention.
Figure 5 is a cross-sectional view of the lower hopper of the heat exchanger of the present invention shown in FIG.
Figure 6 is a cross-sectional view of the lower hopper of the heat exchanger of the present invention shown in FIG.
FIG. 7 is a cross-sectional view taken along the line AA of FIG. 5.
8 is a cross-sectional view taken along line BB of FIG. 5.
9 is a cross-sectional view taken along line CC of FIG. 5.
10 is an enlarged view of a gas air heater and a coal mill according to an embodiment of the present invention;
11 is a perspective view of the lower components of the flow yarn cooling device according to an embodiment of the present invention.
12 is a perspective view of a steam drum according to an embodiment of the present invention.
13 is a side view of a steam drum according to an embodiment of the present invention.
14 is a cross-sectional view of a steam drum according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described a waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooling device according to an embodiment of the present invention.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is a schematic diagram of a waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooling apparatus according to an embodiment of the present invention, and FIG. 2 is a combustion chamber lower hopper heat exchanger and flow yarn according to an embodiment of the present invention. It is a front sectional view showing a cooling apparatus, and FIG. 3 is a sectional view seen in a right angle direction in FIG.

Figure 4 is an exploded perspective view of a heat exchanger according to an embodiment of the present invention, Figure 5 is a cross-sectional view of the lower hopper of the heat exchanger of the present invention shown in Figure 2, Figure 6 is a heat exchanger of the present invention shown in Figure 3 7 is a cross-sectional view taken along line AA of FIG. 5, FIG. 8 is a cross-sectional view taken along line BB of FIG. 5, and FIG. 9 is a cross-sectional view taken along line CC of FIG. 5.

10 is an enlarged view of a gas air heater and a coal mill according to an embodiment of the present invention, Figure 11 is a perspective view of the main components of the lower side of the flow yarn cooling apparatus according to an embodiment of the present invention, Figure 12 is a view of the present invention 13 is a perspective view of a steam drum according to an embodiment, FIG. 13 is a side view of a steam drum according to an embodiment of the present invention, and FIG. 14 is a cross-sectional configuration diagram of a steam drum according to an embodiment of the present invention.

1 to 13, a waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooling device according to an embodiment of the present invention includes a combustion chamber 2, a heat exchanger 10, and a gas air heater ( 80), combustion air supply unit 150, flow yarn cooling device (100).

The combustion chamber 2 is configured to form an upper shape of the combustion chamber lower hopper heat exchanger of the fluidized bed combustion chamber boiler, in which solid fuel (RDF, wood chip) or biomass is combusted, and fluidized yarn is fluidized. .

The lower hopper 20 is integrally formed in the lower part of the combustion chamber 2.

The heat exchanger 10 is provided in the lower hopper 20 in the lower part of the combustion chamber, and sucks heat while discharging the introduced combustion air through the first pipe line 4 and discharges it in a heated state.

The first pipe line 4 is provided with a steam air heater 12 that warms up when the temperature of the combustion air supplied to the lower hopper 20 is low.

The steam heat exchanger 12 serves to preheat the temperature supplied to the lower hopper 20 of the combustion chamber 2 in order to maintain 10 to 30 ° C., especially 20 ° C., when the temperature of the outside air is low, such as in winter.

The lower hopper 20 of the heat exchanger 10 is provided on the lower side of the combustion chamber 2 and has an inner hopper 22 through which the fluid is discharged, and an outer hopper 22 having a space 26 on the outer side of the inner hopper 22. Hopper 24.

The lower hopper 20 is configured to discharge non-combustibles and flow sand generated after the solid fuel or biomass is combusted in the combustion chamber 2.

The lower hopper 20 is provided under the combustion chamber 2 and has an inner hopper 22 for discharging incombustibles and fluids, and an outer hopper disposed to have a space 26 on the outer side of the inner hopper 22 ( 24).

That is, since the lower hopper 20 of the present invention has a double partition structure having a space portion 26 between the inner hopper 22 and the outer hopper 24, unlike the existing lower hopper having a single partition structure In order to absorb the heat of the lower hopper 20 by moving the combustion air through the space 26, the lower hopper 20 may be configured to cool.

The lower hopper 20 including the inner hopper 22 and the outer hopper 24 is used by selecting a material that can withstand high temperature incombustibles and flow yarns discharged downward.

Although two lower outlets of the inner hopper 20 are illustrated, one or two or more outlets may be formed.

The inner hopper 22 and the outer hopper 24 preferably have a rectangular cross section. Of course, it is possible to have various shapes as needed.

1 to 9, the heat exchanger 10 of the present invention includes a combustion air inlet 30, a combustion air outlet 40, and a temperature increasing unit 50.

Combustion air inlet 30 is provided in the lower portion of the outer hopper 24 to introduce low-temperature combustion air into the space portion 26.

Combustion air inlet 30 is a rectangular hole formed in the lower side of the outer hopper 24, it is formed in communication with the outer hopper 24 so that the low-temperature combustion air flows into the space 25 from the outside.

The combustion air inlet 30 may be formed in a circular or other shape as necessary.

The outer periphery of the combustion air inlet 30 is equipped with a combustion air inlet pipe 32 for moving the low temperature combustion air of the second conduit 4 to the inside.

The combustion air inlet pipe 32 mainly uses a rectangular pipe. Of course, it is also possible to apply a circular tube or other polygonal tube as needed.

Combustion air outlet 40 is provided on the upper side of the outer hopper 24 to discharge the high-temperature combustion air from the space 26.

Combustion air outlet 40 is a rectangular hole formed in the upper side of the outer hopper 24, the internal hopper 24 communicates with the outer hopper 24 from the inside to the outside so that the high temperature combustion air in the space 25 to the outside do.

The combustion air outlet 40 may be formed in a circular or other shape as necessary.

A combustion air discharge pipe 42 for moving the high temperature combustion air to the second pipe line 6 is mounted on the outer circumference of the combustion air discharge port 40.

The combustion air discharge pipe 42 mainly uses a square pipe. Of course, it is also possible to apply a circular tube or other polygonal tube as needed.

Combustion air outlet 40 is preferably provided on the opposite side of the combustion air inlet (30). The reason is to allow the low temperature combustion air introduced into the space 26 through the combustion air inlet 30 to be discharged to the combustion air outlet 40 while absorbing the heat generated from the inner hopper 22 as much as possible. .

The lower hopper 20 is provided with a blocking member 28 for connecting the upper end of the inner hopper 22 and the outer hopper 24 to block the upper open portion of the space (26).

Blocking member 28 is preferably applied to the frame of the frame.

The temperature rising part 50 is configured to discharge the combustion air introduced into the combustion air inlet 30 through the circulation path to the combustion air outlet 40 in a heated state by sucking (heat exchange) the heat from the lower hopper.

The temperature rising part 50 includes a diaphragm 52, a combustion air supply tube 58, and an opening part 60.

The diaphragm 52 divides the space portion 26 of the lower hopper 20 into upper and lower layers, and is configured in a rim shape provided between the combustion air inlet 30 and the combustion air outlet 40.

The diaphragm 52 is provided at the upper side of the combustion air inlet 30 to partition the space portion 26, and is provided at the upper side of the lower plate 54 and the lower side of the combustion air outlet 40. And an upper plate 56 that defines 26.

The diaphragm 52 is installed on the outer circumferential surface of the inner hopper 24 and the inner circumferential surface of the outer hopper 22 to be sealed without gaps such as welding or bolting coupling.

The lower plate 54 is formed larger than the upper plate 56 because the lower hopper 20 has a shape that narrows from the upper side to the lower side.

A plurality of combustion air supply tubes 58 are provided in the inner hopper 33 and are arranged to penetrate the combustion air from one side to the other side.

Since the combustion supply feed tube 58 is disposed across the inside of the inner hopper 33, the non-combustibles and fluids generated after the solid fuel or the biomass are combusted in the combustion chamber 2 are discharged to the lower part to supply the high temperature heat. By passing the combustion air through the feed tube 58, the low temperature combustion air is converted into the high temperature combustion air.

The combustion air supply tube 58 is arranged in a plurality of horizontally arranged in the inner hopper 22 and arranged in multiple layers up and down, it is preferable that the adjacent combustion air supply tube 58 is arranged to be offset from each other.

The reason why the combustion air supply tube 58 is arranged to be shifted up and down is that the non-combustibles and the flowing sand are discharged downward through the inner hopper 22 to change the movement path, so that a large amount of heat is supplied to the combustion air supply tube 58. Helps to deliver combustion air moving inside.

Combustion air supply tube 58 is provided in at least one of the cross-section of the circle, square, oval, triangle.

Combustion air supply tube 58 is provided with two layers in a state where a plurality of horizontally arranged between the lower plate 54 and the upper plate 56, and a plurality of horizontally arranged above the upper plate 56, respectively. The state in which two layers are provided is shown. Of course, the interval between the combustion air supply tube 58 is installed and the number of upper and lower layers may be variously selected.

When the combustion air supply tube 58 has a rectangular cross section, it is preferable that the corners are disposed up and down to facilitate discharge of the incombustibles and the flow yarn.

That is, the inclined surface of the other combustion air supply tube 58 adjacent to the lower side of the lower hopper 20 and the non-combustibles and flow sand falling toward both sides of the inclined surface moving to the square corner portion of the combustion air supply tube 58 and adjacent to the lower side Since the impingement and the movement of the fluid to help to discharge completely without being laminated to the combustion air supply tube (58).

The opening part 60 is provided in the diaphragm 52 such that the combustion air introduced into the combustion air inlet 30 moves in a zigzag manner through the space 26 and the combustion air supply tube 58.

Opening part 60 is a predetermined area of the diaphragm 52 is opened to communicate the upper and lower space 26 with respect to the diaphragm 52, and helps the combustion air to move from the lower region to the upper region.

The opening part 60 is provided on the lower plate 52 and is provided on the opposite side of the combustion air inlet 30, and is provided on the upper plate 56 and the first opening part 62. And a second open portion 64 formed on the opposite side of the combustion air outlet 40.

1 and 10, the gas air heater 80 is provided in the waste heat discharge path of the combustion chamber 2, and the high temperature combustion air discharged from the heat exchanger 10 moves to the second pipe line 6 to waste heat. Absorb and raise the temperature.

The gas air heater 80 absorbs heat from the waste heat discharged to the main pipe by arranging an auxiliary pipe through which the hot combustion air moved to the second pipe line 6 moves in the main pipe forming the waste heat discharge path of the combustion chamber 2. And the temperature is raised and discharged into the third pipe line 8.

The temperature of the waste heat moving through the gas air heater 80 has a temperature range of 280 ~ 160 ℃. That is, it has a temperature of about 160 ° C. at the 280 ° C. discharge side at the entry side.

Therefore, the high temperature combustion air introduced into the gas air heater 80 via the second pipe line 6 is discharged to the third pipe line 8 at about 100 to 180 ° C, particularly about 130 to 140 ° C.

Above the gas air heater 80, a waste heat discharge path of the combustion chamber 2 is provided. It further includes an economizer 90 for supplying water supplied from the outside to the steam drum 160.

The economizer 90 receives water from the water supply tank 92, absorbs heat from the waste heat discharge path of the combustion chamber 2, warms it, and then vaporizes the water through the water supply pipe 94. By supplying the warmed water to the drum 160, it is possible to increase the thermal efficiency to reduce fuel consumption and increase the amount of steam generated.

The third conduit 8 is provided with a hot blast furnace 14 for raising the initial temperature of the combustion air supplied to the combustion chamber 2 when the waste heat recycling system of the present invention is operated.

The hot air furnace 14 prevents cold combustion air from entering the combustion chamber 20 at the initial stage of system operation, and serves to assist the system operation by supplying the warmed combustion air to the combustion chamber 2.

The hot blast 14 is operated by manual or automatic control when the waste heat recycling system is normally operated by operating the gas hopper 80 as well as the lower hopper 20.

The combustion air supply unit 150 supplies the high temperature combustion air of the gas air heater 80 to the combustion chamber 2 through the third conduit 8.

The combustion air supply unit 150 includes a diffuser header 152 to which a plurality of combustion engines are connected from the outside of the combustion chamber 2 and supplied with high temperature combustion air, and to supply air to the plurality of diffuser headers 152. And a plurality of diffuser nozzles 156 which are disposed in the periphery and are connected to the third conduit 8 and are mounted above the diffuser header 152 to inject hot combustion air.

The diffuser header 152 is horizontally arranged at equal intervals, and the diffuser nozzle 156 is also disposed in the vertical direction and is arranged to inject air in the upper four directions.

The connection pipe 154 is disposed side by side on the combustion chamber 2 side, the diffuser 152 is a plurality of branches in the connection pipe 154 in a perpendicular direction is arranged to be connected to the combustion chamber 20 inside.

The air diffuser nozzles 156 are arranged in the upper part of each diffuser header 152 to supply high temperature combustion air upwards.

The high temperature combustion air supplied into the combustion chamber 2 from the gas air heater 80 through the third pipe line 8, the connecting pipe 154, the plurality of diffuser headers 152, and the plurality of diffuser nozzles 156 is solid. While helping fuel or biomass to burn well, it also plays a role in helping to generate steam in the fluidized yarn cooling apparatus 100.

The flow yarn cooling device 100 is disposed above the combustion air supply unit 150 and moves steam to cool the superheated flow yarn to produce steam in the steam drum 160.

1, 2 and 11 to 14, the flow yarn cooling apparatus 100 includes a cooling tube 120, supply header 130, discharge header 140 and heat exchange unit 170. .

Combustion chamber (2) is flowed along with the solid fuel or biomass while flowing fluid is supplied from the air supply unit 150 to be described below as the flowing air is generated a strong rising air flow generates high heat and is discharged to the outlet located on the upper side.

The cooling tube 120 is installed in the flow yarn of the combustion chamber 2, and the cooling water moves to cool the overheated flow yarn.

The supply header 130 is separately disposed in the combustion chamber 2 and supplies the cooling water introduced into the inlet pipe 132 to the cooling tube 120.

One end of the inlet pipe 132 is connected to the supply header 130, and the other end thereof is connected to the discharge side of the steam drum 160.

The inlet pipe 132 is provided with a circulation pump 134 for supplying cooling water.

One or more circulation pumps 134 may be provided according to the amount of cooling water supplied.

The discharge header 140 is disposed separately in the combustion chamber 2, and discharges steam and hot coolant absorbing the heat of the flow yarn from the cooling tube 120 and transfers them to the supply pipe 142.

One end of the supply pipe 142 is connected to the discharge header 140, and the other end thereof is connected to the inflow side of the steam drum 160.

The cooling tube 120 serves to lower the flow yarn temperature by absorbing a portion of the high temperature heat while the flow yarn flows, thereby preventing the flow yarn from being melted due to the high temperature.

The cooling tube 120 is interconnected in a zigzag shape in the combustion chamber 110 in a state in which the discharge header 140 is disposed above the supply header 130.

The cooling tubes 120 are arranged in a plurality of longitudinal side surfaces of the supply header 130 and the discharge header 140, and each cooling tube 120 is configured to be evenly arranged in the vertical direction.

For example, the cooling tube 120 connected in the supply header 130 returns to the vertically arranged state before entering the combustion chamber 110 and touching the inner wall of the opposite combustion chamber 110, and then again entering the combustion-side combustion chamber ( 110) it is connected to the discharge header 140 while repeating the process of returning to the vertical direction before reaching the inner wall.

Therefore, when the supply header 130 and the discharge header 140 are disposed in the same direction as the outside of the combustion chamber 2, they are necessarily arranged in even layers.

In the present exemplary embodiment, the cooling tube 120 is repeatedly bent three times from one inner wall surface of the combustion chamber 2 to the other inner wall surface, and is arranged in four layers. Can be arranged.

If the supply header 130 and the discharge header 140 are disposed on opposite sides of the combustion chamber 2, respectively, the supply header 130 and the discharge header 140 will be arranged in an odd number in the vertical direction, but because the cooling tube 120 is connected to both sides of the combustion chamber 2, The installation work is difficult, and even if installed, the leakage of combustion heat may increase, which is not preferable.

Cooling tube 120 is arranged in a plurality of left and right in the supply header 130 and the discharge header 140, when evenly arranged up and down, it is preferably arranged at equal intervals.

As such, since the cooling tube 120 is uniformly disposed over the entire area in the state of being buried in the flow yarn in the combustion chamber 2, the low-temperature cooling water supplied from the supply header 130 rapidly absorbs the high heat generated in the flow yarn and flows. While cooling the yarn is converted into steam and hot coolant is transferred to the discharge header 140, it is possible to prevent the flowing sand is melted due to high heat.

When a flow control valve (not shown) is installed in the low temperature cooling water pipe of the discharge port of the circulation pump 134, the temperature of the flow yarn can be controlled in detail, and thus the combustion chamber operating temperature can be easily adjusted.

The supply header 130 and the discharge header 140 may have a cylindrical shape and have the same shape and the same size.

The outer circumferential surface of the cooling tube 120 forms a nickel chromium coating layer having a thickness of 3 to 7 mm to withstand the wear caused by the flow of the flow yarn. In particular, it is good to coat 4 ~ 6mm thick.

12 to 14, the heat exchanger 170 receives steam and hot coolant from the supply pipe 142 to produce additional steam in the steam drum 160, and the cold coolant replenished in the steam drum 160. To discharge to the inlet pipe (132).

The heat exchanger 170 is connected to the supply pipe 142 to supply steam and hot coolant into the steam drum 160, and has a steam discharge header 172 and one end of which is blocked, and an upper side of the steam discharge header 172. The discharge member 174 and a plurality of discharge members 174 for discharging steam and hot coolant into the steam drum 160 and disposed around the steam discharge header 172 and connected to the inlet pipe 132 are connected to the outside of the steam drum 160. One side of the cooling water inlet header 176, one end of which is blocked to discharge the cooling water replenished from the suction member, and the suction member which is connected to the lower side of the cooling water inlet header 176 to suck the cooling water replenished from the vortex under the steam drum 160 ( 178).

Referring to FIG. 13, the discharge member 174 and the suction member 178 are alternately disposed to alternate with each other at a mutually set interval D in a horizontal arrangement.

The discharge member 174 and the suction member 178 may be pipe members mounted in holes or holes formed on the upper and lower sides of the vapor discharge header 172 and the coolant inlet header 176, respectively.

The end of the discharge member 174 and the end of the suction member 178 away from each other may be advantageous for steam generation and thermal efficiency enhancement.

The steam and hot coolant discharged from the discharge member 174 provide additional steam and high temperature heat to steam and hot water already stored in the steam drum 160, thereby reducing the steam efficiency produced by the steam drum 160. The effect of improving ˜3% is obtained.

This is to maximize the efficiency of the fluidized bed combustion chamber boiler since the effect of cooling the flow yarn of the combustion chamber 2 and the effect of additional steam production can be achieved simultaneously.

In addition, the suction member 178 is disposed in the lower side to suck the water replenished from the outside with the cooling water to repeat the process of supplying the supply header 130 again through the inlet pipe 132 and the circulation pump 134.

Referring to FIG. 14, the steam discharge header 172 and the coolant inlet header 176 are disposed in the hot water below the radial line of the steam drum 160, and the steam discharge header 172 is connected to the coolant inlet header 176. It is placed at a higher position in comparison.

That is, a height difference H occurs between the cross-sectional center line of the steam discharge header 172 and the cross-sectional center line of the coolant inflow header 176.

As a result, the height difference between the end of the discharge member 174 and the end of the suction member 178 may be maximized to prevent the steam and the high temperature coolant and the low temperature coolant meet to maximize the thermal efficiency.

Hereinafter, with reference to the accompanying drawings to look at the action of the waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooling device according to an embodiment of the present invention.

When the waste heat recycling system is operated, the outside air is sucked through the blower fan to the first pipe line 4, and the cool air is heated through the steam heat exchanger 12, and then the combustion air inlet 30 of the lower hopper 20 is heated. ).

Subsequently, solid fuel and biomass are supplied into the combustion chamber 2 to be combusted while being fluidized and circulated with the flow yarn.

In addition, the non-combustibles such as metal powder and fluidized sand generated while the solid fuel and the biomass are burned are discharged downward through the lower hopper 20 integrally provided in the lower portion of the combustion chamber 2.

At this time, looking at the process of supplying the low-temperature combustion air by using the high temperature incombustibles and flow yarn discharged from the lower hopper 20 to make the high temperature combustion air, the inner hopper 22 through the combustion air inlet (30) And low temperature combustion air flow into the lower space 26 formed between the and outer hoppers 24 and below the lower plate 54.

Subsequently, the low temperature combustion air introduced into the lower space 26 moves to the opposite side through the circumference of the inner hopper 22 and moves upward through the first opening 62 formed in the lower partition 54. .

Then, the combustion air that has risen through the first opening portion 62 is partially warmed, and some combustion air is supplied to the inner hopper 22 through the central space portion 26 between the lower plate 54 and the upper plate 56. It moves to the opposite side via the provided combustion air supply tube 58, some combustion air is moved to the opposite side through the circumference of the inner hopper 22, the second open portion 64 provided in the upper plate 56 Go to the upper side through.

Then, the combustion air that has risen through the second opening 64 is warmed, and some air is supplied to the inner hopper 22 through the upper space 26 located above the upper plate 56. After moving to the other side again through the tube 58, some combustion air is collected by moving back to the other side through the circumference of the inner hopper 22, and discharges the high temperature combustion air to the combustion air outlet 40.

At this time, the temperature of the combustion air flowing into the combustion air inlet 30 is about 20 ℃, the temperature of the combustion air to discharge the combustion air outlet 40 is approximately 80 ℃. This can be calculated by calculating the heat transfer area in consideration of the area of the diaphragm 52, combustion air supply tube 58 and the lower hopper 20, etc. in the design stage.

On the other hand, the waste heat discharged to the 280 ~ 160 ℃ from the gas air heater 80 provided in the waste heat discharge path of the combustion chamber (2) of about 80 ℃ through the second pipe (6) via the combustion air outlet 40 Absorption is converted into hot combustion air having a temperature range of 100 to 180 ° C., in particular, 130 to 140 ° C., and discharged into the third pipe line 8.

The high temperature combustion air passing through the third pipe passage 8 is supplied to the combustion chamber 2 through the connecting pipe 154, the diffuser header 152, and the combustion air supply nozzle 156, so that preheated combustion air is supplied. Therefore, as the amount of steam produced in the fluidized bed combustion chamber boiler is increased by 1.5 to 1.6%, the lower hopper 20 may be cooled and the steam production efficiency may be improved.

In addition, as the high temperature combustion air (100 to 180 ° C.) is supplied to the combustion chamber (2), the combustion air is supplied over the dew point temperature of 65 to 67 ° C. for hydrogen chloride (HCl) and other corrosive gases. Low temperature corrosion of metal materials can be prevented in advance.

As such, the durability of the equipment increases as it operates to avoid low temperature corrosion of hydrogen chloride (HCl) and other corrosive gases, and at the same time, it discharges the incombustibles and flow sand energy discharged and supplies the high temperature combustion air to the combustion chamber 2. It can prevent melting of the flowing sand while replenishing the calories, and promote the flow efficiency of the flowing sand by promoting the discharge of incombustibles.

On the other hand, as the hot combustion air supplied to the combustion chamber 2 blows heat into the flow sand, the solid fuel, and the biomass, the steam can be produced while cooling the flow sand slightly to prevent melting of the flow sand. There is a need.

As such, the coolant pumped by the circulation pump 134 and passed through the inlet pipe 132 and the supply header 130 to cool the high heat generated in the flow yarn passes through the plurality of cooling tubes 120 to recover the high heat from the flow yarn. Absorbed and converted into steam and hot coolant is transferred to the discharge header 140.

Subsequently, the steam and hot coolant temporarily stored in the discharge header 140 pass through the supply pipe 142 to discharge steam and hot coolant upward through the discharge member 174 in the steam discharge header 172 of the heat exchanger 170. Supply high heat.

Therefore, additional steam is produced inside the steam drum 160 to increase the stock production efficiency.

The water cooled slightly in the steam drum 160 is moved downward to transfer the coolant in a low temperature state to the inlet pipe 132 through the suction member 178 and the coolant inlet header 176 of the heat exchanger 170. To circulate the coolant.

In this way, by simultaneously repeating the process of cooling the flow sand using the circulating cooling water and producing additional steam by heat absorbed from the flow sand, it is possible to maximize the flow sand cooling efficiency and the steam production efficiency. The calorific value of solid fuel can be used up to 5,000kcal / kg.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. I will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

2: combustion chamber 4,6,8: first, second, third pipe
10: heat exchanger 20: lower hopper
22: inner hopper 24: outer hopper
26: space portion 28: blocking member
30: combustion air inlet 32: combustion air inlet
40: combustion air discharge port 42: combustion air discharge pipe
50: heating unit 52: diaphragm
54: lower plate 56: upper plate
58: combustion air supply tube 62, 62: the first and second open parts
80: gas air heater 90: cutting machine
100: flow yarn cooling device 120: cooling tube
130: supply header 132: inlet pipe
134: circulating pump 140: discharge header
150: combustion air supply unit 152: diffuser header
154 connector 156: air nozzle
160: steam drum 170: heat exchange unit
172: steam discharge header 174: discharge member
176: coolant inlet header 178: suction member
180: lower drum 182: upward tube

Claims (16)

A combustion chamber in which solid fuel or biomass is combusted and fluidized in a fluid yarn;
A heat exchanger provided in the lower hopper below the combustion chamber and discharging the introduced combustion air through a first pipe to discharge heat in a state of being heated up;
A gas air heater provided in the waste heat discharge path of the combustion chamber and moving the high temperature combustion air discharged from the heat exchanger to a second pipe to absorb the waste heat and heat up;
Combustion air supply unit for supplying the high temperature combustion air of the gas air heater to the combustion chamber through a third pipe; And
It is disposed above the combustion air supply, and includes a flow yarn cooling device for producing steam in the steam drum while moving the cooling water to cool the superheated flow yarn,
The lower hopper of the heat exchanger, the inner hopper provided in the combustion chamber lower discharged flow fluid; And
Waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooling device comprising an outer hopper disposed to have a space portion on the outside of the inner hopper.
The method of claim 1,
The first pipeline is provided with a steam heat exchanger to warm up when the temperature of the combustion air supplied to the lower hopper is low,
The third pipe is a waste heat recycling system having a combustion chamber lower hopper heat exchanger and a fluid yarn cooling device, characterized in that the hot blast furnace for raising the initial temperature of the combustion air supplied to the combustion chamber when the waste heat recycling system is operating.
The method of claim 1,
Above the gas air heater,
The waste heat discharge path is provided. Waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooling device further comprises a coal mill for heating the water supplied from the outside to the steam drum.
The method of claim 1,
The heat exchanger,
A combustion air inlet provided in a lower portion of the outer hopper to introduce low-temperature combustion air into the space part;
A combustion air outlet provided at an upper portion of the outer hopper to discharge high-temperature combustion air from the space part; And
A heating unit for discharging the combustion air introduced into the combustion air inlet through a circulation path and discharging the heat from the lower hopper to the combustion air outlet in a heated state;
Waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooling device comprising a.
The method of claim 4, wherein
The lower hopper has a blocking member for connecting the upper end of the inner hopper and the outer hopper to block the upper open portion of the space,
The combustion air outlet is a waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooling device, characterized in that provided on the opposite side to the combustion air inlet.
The method of claim 4, wherein
The heating unit,
A partition plate partitioning the space portion of the lower hopper into an upper and lower layers and provided between the combustion air inlet and the combustion air outlet;
A plurality of combustion air supply tubes provided in the inner hopper and disposed to pass through the combustion air from one side to the other side; And
An opening part provided in the diaphragm to move the combustion air introduced into the combustion air inlet to the zigzag through the space part and the combustion air supply tube;
Waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooling device comprising a.
The method of claim 6,
The diaphragm is,
A lower plate provided above the combustion air inlet and partitioning the space part; And
And an upper plate disposed above the lower plate and below the combustion air outlet to partition the space.
The method of claim 7, wherein
The opening portion,
A first opening part provided on the lower plate and formed on an opposite side of the combustion air inlet; And
A waste heat recycling system having a combustion chamber lower hopper heat exchanger and a fluid yarn cooling device provided on the upper plate and including a second open portion formed on an opposite side of the first open portion and the combustion air outlet.
The method of claim 6,
The combustion air supply tube is arranged in a plurality of horizontally arranged in a row in the inner hopper and arranged in a plurality of layers, the combustion air supply tube adjacent to the up and down are arranged to be offset from each other,
The combustion air supply tube is provided in at least one shape of a cross section of a circle, square, oval, triangle,
When the combustion air supply tube has a rectangular cross-section, waste heat recycling system having a combustion chamber lower hopper heat exchanger and the flow yarn cooling device characterized in that the corner is arranged up and down to facilitate the discharge of non-combustibles and flow yarn.
The method of claim 1,
The combustion air supply unit,
A diffuser header having a plurality of connected to the inside from the outside of the combustion chamber and supplied with air;
A connection pipe positioned around the combustion chamber to supply air to the plurality of diffuser headers and connected to the third pipe path; And
A waste heat recycling system having a combustion chamber lower hopper heat exchanger and a fluid yarn cooling device, characterized in that it comprises a plurality of diffuser nozzles mounted on the diffuser header to inject air.
The method of claim 1,
The flow yarn cooling device,
A cooling tube to which cooling water moves to cool overheated flow yarn of the combustion chamber;
A supply header disposed separately in the combustion chamber and supplying the cooling water introduced into the inlet pipe to the cooling tube;
A discharge header disposed separately in the combustion chamber and discharging steam and hot coolant absorbing the heat of the flow yarn from the cooling tube to be transferred to the supply pipe; And
A heat exchanger receiving steam and hot coolant from the supply pipe to produce additional steam in the steam drum, and discharging the cold coolant replenished from the outside in the steam drum to the inlet pipe;
Waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooling device comprising a.
12. The method of claim 11,
The cooling tube,
Interconnected in a zigzag shape inside the combustion chamber with the discharge header disposed above the supply header,
A waste heat recycling system having a combustion chamber lower hopper heat exchanger and a flow yarn cooler, which are arranged in a plurality of longitudinal side surfaces of the supply header and the discharge header, and each cooling tube is evenly arranged up and down.
12. The method of claim 11,
The supply header and the discharge header is formed in the same shape and the same size as the cylindrical shape,
Waste heat recycling system having a combustion chamber lower hopper heat exchanger and a fluid yarn cooling device on the outer peripheral surface of the cooling tube to form a nickel chromium coating layer of 3 ~ 7mm thickness to withstand the wear caused by the flow of the fluid yarn.
12. The method of claim 11,
The heat exchange unit,
A steam discharge header connected to the supply pipe to supply steam and hot water into the steam drum, and one end of which is blocked;
A plurality of discharge members connected to an upper side of the steam discharge header to discharge steam and hot coolant into the steam drum;
A coolant inlet header disposed at the periphery of the steam discharge header and connected to the inlet pipe and having one end closed to suck the coolant replenished from the outside of the steam drum; And
And a suction member connected to the lower side of the cooling water inlet header to suck cooling water supplemented from the outside under the steam drum, and a combustion chamber lower hopper heat exchanger and a fluid yarn cooling system.
The method of claim 14,
The discharge member and the suction member are arranged to cross each other at mutually set intervals (D) in a horizontal arrangement,
The discharge member and the suction member is provided with a combustion chamber lower hopper heat exchanger and a flow yarn cooling device, characterized in that the pipe member mounted in the hole or the hole formed in the upper and lower sides of the steam discharge header and the cooling water inlet header, respectively. Waste heat recycling system.
The method of claim 14,
The steam discharge header and the coolant inlet header are disposed below the radial line of the steam drum,
And the steam discharge header is disposed at a higher position than the cooling water inlet header.

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