CN102345850B - Thermal recovery system with improved thermal efficiency and thermoelectric combined production system equipped with the thermal recovery system - Google Patents

Abstract

The present invention provides a heat recovery system having an improved heat recovery rate and a cogeneration system using the system, the heat recovery system includes a plurality of combustion devices, each of which includes: a combustion vessel receiving externally supplied combustion air, And burn the fuel contained therein; the feeding unit supplies the fuel to the combustion chamber; the gas discharge unit is arranged on the upper part of the combustion container, the lower part of the gas discharge unit communicates with the upper part of the combustion container, and discharges high temperature through the gas discharge unit Gas, high-temperature gas is produced by burning fuel supplied from a feed unit to a combustion container; a gas collection chamber, connected to a plurality of combustion devices, collects high-temperature gas generated in a plurality of combustion devices in one place; boiler, Receives the high temperature gas in the plenum and collects heat from the supplied gas through a heat exchange process. The invention ensures complete combustion of the solid fuel loaded into the combustion chamber and reduces heat loss.

Description

Heat recovery system with improved heat recovery rate and combined heat and power system using the same

technical field

The present invention relates to a heat recovery system with improved heat recovery rate, and more particularly to a heat recovery system which collects heat from gas and uses the collected heat as recovery energy, wherein the gas is Generated by burning solid fuel, etc. in a combustion chamber; and relates to a combined heat and power system using the heat recovery system.

Background technique

In general, industrial facilities that require industrial hot water, high-temperature steam or gas, respectively, generate thermal energy using a combustion device that ignites and burns fuel in a combustion vessel. In addition, from the viewpoint of economic efficiency and resource regeneration, solid fuels are widely used as fuels used in combustion devices, for example, Refuse Derived Fuel (RDF) that turns waste into fuel or waste plastic Refuse Plastic Fuel (RPF) that turns waste into fuel.

However, since these existing combustion devices utilize a method of putting a large amount of solid fuel into the bottom of the combustion container and burning the solid fuel, the solid fuel may not be completely burned, thereby causing waste of solid fuel and reducing Thermal efficiency. In addition, since a large amount of ash is generated every time, it is not easy to build an automatic disposal of the residual ash, and it is inconvenient to take the residual ash out from the bottom of the burning container. In addition, if the solid fuel has been completely burned at the bottom of the combustion container, new solid fuel should be put into the bottom of the combustion container and then ignited again, making it difficult to perform a continuous combustion process and making the calorific value uneven.

In addition, these solid fuels cause a problem of emitting a large amount of gases or particles polluting the environment during combustion, such as dust, carbon monoxide, soot, gaseous HCL, SOx, NOx, and dioxin.

In order to solve these problems, a combustion device 1000 shown in FIG. 1 has been developed. The heat collecting combustion device 1000 according to the prior art burns the solid fuel supplied from the fuel feeder 3 to the combustion vessel 1, thereby generating hot gas. Here, air required for burning fuel is supplied from the outside to the combustion chamber 110 via the air cooling chamber 150 , the passage 140 a of the intermediate wall 140 , the swirl flow supply chamber 130 and the passage 120 a of the inner wall 120 .

In the case of using the existing heat recovery system of the combustion device 1000, a boiler (not shown) is connected to the combustion device 1000, and the high-temperature gas generated by burning the fuel in the combustion chamber 110 via the elbow gas exhaust pipe 4 Supply to the boiler, where heat from the gas is collected to generate process steam or hot water.

However, since a single boiler is connected to a single combustion device in the existing heat recovery system for collecting heat, it is difficult to obtain a large amount of gas. In order to obtain a large amount of gas, the size of the combustion vessel in the combustion equipment needs to be large, but the increase in the size of the combustion vessel is limited. Therefore, it is difficult to obtain high-pressure steam.

In addition, the gas exhaust pipe 4 contained in the combustion device 1000 used in the existing heat recovery system is formed by a refractory wall. Since the refractory wall is continuously exposed to high-temperature hot gas, the gas exhaust pipe 4 may rupture after a long time . Like this, the gas exhaust pipe 4 may not be used for too long and has to be replaced with a new gas exhaust pipe. In addition, ash or tiny particles contained in the gas may stick to the refractory walls and cannot be easily removed.

In addition, combustion air is supplied only to the outside of the solid fuel that has been loaded into the combustion chamber. Accordingly, the exterior of a solid fuel burns well, but its interior may have poor access to the air required for combustion, and therefore may not burn completely. This reduces combustion efficiency. In addition, the inner wall of the combustion chamber is permanently exposed to high-temperature gas, and it will be deformed or cracked after long-term use, thereby reducing durability.

Contents of the invention

In order to solve the above-mentioned problems of the prior art, an object of the present invention is to provide a heat recovery system capable of generating a large amount of high-pressure steam.

In addition, another object of the present invention is to provide a heat recovery system and a combined heat and power system using the heat recovery system. The heat recovery system ensures the complete combustion of the solid fuel loaded into the combustion chamber, thereby reducing heat loss and improving heat recovery. recovery and enhanced durability.

In order to achieve the above object of the present invention, according to one aspect of the present invention, a heat recovery system with improved heat recovery rate is provided, comprising:

A plurality of combustion devices, each of which includes: a combustion container for receiving gas supplied from the outside, and combusting the fuel contained in the combustion container; Fuel is supplied to the combustion container; and a gas discharge unit is arranged on the upper part of the combustion container, and the lower part of the gas discharge unit communicates with the upper part of the combustion container so that high-temperature gas is discharged through the gas discharge unit. The high-temperature gas is generated by burning fuel supplied from the supply unit to the combustion vessel;

a gas collection chamber, connected to the plurality of combustion devices, and used to collect high-temperature gas generated in the plurality of combustion devices in one place;

and a boiler for receiving the high-temperature gas collected in the plenum and collecting heat from the supplied gas through a heat exchange process.

Preferably, but not necessarily, a gas outlet unit is formed in the gas collection chamber, through which gas enters the boiler from the plurality of combustion devices, and moves toward the gas outlet unit as the introduced gas , and the internal cross-sectional area of the gas collection chamber gradually becomes larger as it tends to the gas outlet unit, and the gas introduced from the plurality of combustion devices increases, so that the gas entering the gas collection chamber passes through the Outflow from the outlet unit described above.

Preferably but not necessarily, the plurality of combustion devices are arranged to face each other around the plenum so that the gas enters the plenum from both sides of the plenum, wherein the The gas is supplied to the plenum from the plurality of combustion devices.

According to one aspect of the present invention, there is provided a combined heat and power system including a steam turbine and an electric power generator, wherein the steam generated in the boiler of the heat recovery system through heat exchange with gas is supplied to the steam turbine, and the electric power Generators are used for electricity, thus obtaining steam and electricity.

The present invention provides a heat recovery system capable of generating a large amount of high-pressure steam.

The invention provides a heat recovery system and a combined heat and power system using the heat recovery system. The heat recovery system ensures the complete combustion of the solid fuel loaded into the combustion chamber, thereby reducing heat loss, improving heat recovery rate, and enhancing durability.

Description of drawings

The above and other objects and advantages of the present invention will become more apparent from a more detailed description of preferred embodiments of the present invention with reference to the accompanying drawings, in which:

Figure 1 shows a schematic diagram of a combustion device according to the prior art;

2 shows a schematic diagram of a heat recovery system with improved heat recovery rate according to a first embodiment of the present invention;

Fig. 3 is a side view of Fig. 2;

Fig. 4 shows a schematic plan view of the gas discharge unit and the U-shaped flow gas chamber of Fig. 3;

Figure 5 shows a cross-sectional view of a combustion device according to the invention;

Fig. 6 shows a cross-sectional view of one side of the combustion device of Fig. 5;

Figure 7 shows a cross-sectional view of a feed unit of a combustion plant according to the invention;

Figure 8 is a longitudinal sectional view of the boiler in the heat recovery system according to the present invention;

9 shows a plan view of a heat recovery system according to a second embodiment of the present invention;

Figure 10 shows a schematic block diagram of a combined heat and power system according to the present invention;

Fig. 11 shows a schematic block diagram of an air pollution prevention device according to the present invention, which purifies gas in a heat recovery system;

Fig. 12 shows the schematic diagram of the centrifugal dust collector in the air pollution prevention equipment of Fig. 11;

Fig. 13 shows the schematic diagram of the semi-dry reactor in the air pollution prevention equipment of Fig. 11;

Fig. 14 shows the schematic diagram of the dry reactor in the air pollution prevention equipment of Fig. 11; And

FIG. 15 shows a schematic diagram of a filter dust collector in the air pollution prevention device of FIG. 11 .

Detailed ways

A heat recovery system having an improved heat recovery rate according to a first embodiment of the present invention will be described with reference to the accompanying drawings ( FIGS. 2 to 8 ).

Fig. 2 shows a schematic diagram of a heat recovery system with improved heat recovery rate according to a first embodiment of the present invention. FIG. 3 is a side view of FIG. 2 . Fig. 4 shows a schematic plan view of the gas discharge unit and the U-shaped flow gas chamber of Fig. 3 . Figure 5 shows a sectional view of a combustion plant according to the invention. FIG. 6 shows a cross-sectional view of one side of the combustion device of FIG. 5 . Fig. 7 shows a sectional view of a feed unit of a combustion plant according to the invention. Fig. 8 is a longitudinal sectional view of a boiler in the heat recovery system according to the present invention.

According to the first embodiment of the present invention, a heat recovery system with an improved heat recovery rate includes: a plurality of combustion devices 100; a plenum 60 collecting high-temperature gas generated in the plurality of combustion devices 100 into one place; and a boiler 200, collecting heat from the gas through a heat exchange process.

Each combustion device 100 burns the fuel contained in the combustion device 100 to discharge high-temperature gas, and each combustion device 100 includes: a combustion container 10 having a combustion chamber 11 for burning the fuel contained therein; The fuel unit 40 supplies the fuel to the combustion chamber 11; and the gas discharge unit 30 discharges the gas generated from the combustion container 10.

The combustion vessel 10 is formed in a cylindrical shape, contains solid fuel and burns the solid fuel therein. The combustion vessel 10 includes: a combustion chamber 11 surrounded by an inner wall 12 of the combustion vessel 10 to burn fuel; a cooling chamber 13 for cooling the inner wall 12 of the combustion vessel 10; and a side combustion air supply chamber 15 formed on a side of the combustion chamber 11 surface in order to supply the combustion chamber 11 with the air required for combustion from the outside.

The cooling chamber 13 plays the role of lowering the temperature of the inner wall 12 which is in continuous contact with the high-temperature hot gas. As shown in FIGS. 5 and 6, the cooling chamber 13 is formed in the space formed between the inner wall 12 of the combustion vessel 10 and the intermediate wall 14, wherein the intermediate wall 14 is connected to the cylindrical combustion vessel 10 whose inner diameter is narrowed upward. There is a space between the outer sides of the inner wall 12 . Here, a cooling water inlet 14 a through which cooling water flows and a cooling water outlet 14 b through which cooling water flows are formed on the lower and upper sides of the intermediate wall 14 . The cooling water inlet 14 a is formed in a tangential direction with respect to the intermediate wall 14 of the cylindrical combustion vessel 10 . In addition, in the cooling chamber 13, the spiral cooling water guide plate 13a is arranged on the inner side of the middle wall 14, so that the cooling water entering through the cooling water inlet 14a turns around and rises along the cooling water guide plate 13a, and then passes through the inner wall formed in the middle. The cooling water outlet 14b on the upper side of the wall 14 is discharged. The cooling water discharged through the cooling water outlet 14b enters the boiler 200 so that it can be used to collect heat through a connecting pipe (not shown).

The side combustion air supply chamber 15 is formed in a space formed between the middle wall 14 of the combustion vessel 10 and an outer wall 16 formed with a space therebetween from the outside of the middle wall 14 . The externally supplied air required for combustion is supplied from a combustion air supply inlet 16 a formed on the upper side of the outer wall 16 . The lower portion 12a of the side combustion air supply chamber 15 is open. The combustion air supply inlet 16 a is formed in a tangential direction with respect to the cylindrical outer wall 16 . Accordingly, the air supplied through the combustion air supply inlet 16 a turns around inside the side combustion air supply chamber 15 , downward, and then is supplied into the combustion chamber 11 via the open lower portion 12 a of the side combustion air supply chamber 15 .

In addition, an upper combustion air supply chamber 20 for supplying combustion air from the upper side is formed on the upper circumference of the combustion chamber 11 . The upper side combustion air supply chamber 20 is combined with the upper side of the cooling chamber 13 and the side combustion air supply chamber 15 through the rim 18, and the upper side combustion air supply chamber 20 includes: a swirl flow supply chamber 23 formed on the cylindrical upper inner wall 22 (surrounding the upper inner side of the combustion chamber 11), so that the combustion air is supplied to the upper inner side of the combustion chamber 11; Supply combustion air from an external supply.

The swirling flow supply chamber 23 is formed in the space formed between the upper inner wall 22 and the upper middle wall 24, and there is an interval between the upper middle wall 24 and the outer side of the upper inner wall 22; the preheating chamber 25 is formed between the upper middle wall 24 and the upper outer wall. In the space formed between 26, there is a gap between the upper outer wall 26 and the outer side of the upper middle wall 24. An upper air supply inlet 26a is formed at a lower portion of the upper outer wall 26 in a tangential direction relative to the upper outer wall 26, and an air passage 24a is formed at an upper end of the upper intermediate wall 24 so that combustion air supplied from the outside turns and is supplied to the preheating chamber 25. The gas entering the preheating chamber 25 turns and rises in the preheating chamber 25, and then moves from the upper part to the lower part of the swirling flow supply chamber 23 through the air passage 24a formed on the upper end of the upper intermediate wall 24, and then passes through the upper inner wall. The combustion air supply passage 22 a formed at the lower end of 22 is supplied to the upper portion of the combustion chamber 11 . Combustion air is supplied from the upper side combustion air supply unit at an arbitrary point along the circumference of the cylindrical swirling flow supply chamber 23 at an angle of about 10 degrees to 60 degrees with respect to the center direction so that the air indirectly supplied to the combustion gas is determined , thereby reducing the pollution caused by incomplete combustion.

The upper part of the combustion vessel 10 is open to discharge high-temperature hot gas, and the hot gas discharged through the gas discharge pipe 30, U-shaped flow gas chamber 50 and gas collection chamber 60 is introduced into the boiler 200 to collect heat. The boiler collects the heat from the hot gas to obtain high temperature hot steam. Here, the cooling water discharged from the cooling water outlet 14b is introduced into the boiler 200, and then the cooling water is converted into steam using the heat of the gas.

Meanwhile, an ash discharge port 19 is formed at the lower edge of the combustion container 10 to discharge ash of the burnt solid fuel.

In addition, a rotatable rotary grate 17 (a grate is a plate for charging solid fuel in its top surface) is installed at the lower part of the combustion chamber 11 . Rotary fire grate 17 is made disc shape, plays the effect that makes the solid fuel of packing into its top surface burn. The rotary grate 17 slopes down from the center to its outer inflection point and then upwards from the outer inflection point to the outermost point. Therefore, the side cross-section of the rotary grate 17 is V-shaped. A supply unit 40 for supplying solid fuel to the rotary grate 17 is formed at the center of the rotary grate 17 .

As shown in FIG. 7 , a supply unit 40 is vertically formed at the center of the lower part of the combustion vessel 10 , and a fuel inlet 44 is formed at one side of the lower part of the supply unit 40 . In addition, a fuel supply pipe 41 is provided in the supply unit 40 so that solid fuel is supplied into the combustion chamber 11 through the vertical transfer screw unit 42 . In addition, a lower combustion air supply pipe 43 having a larger diameter than the fuel supply pipe 41 and formed in a concentric circle form is formed outside the fuel supply pipe 41, wherein the lower combustion air supply pipe 43 is fed from the combustion air by an air supply unit 45 such as an annular blower. The lower part of the chamber 11 supplies combustion air to the inside of the combustion chamber 11 .

The upper end portion of the supply unit 40 protruding from the fuel supply pipe 41 into the combustion chamber 11 includes: a diameter enlarged portion 41a whose diameter gradually increases (becomes larger) toward the top; The end portion is bent downward and formed obliquely. Accordingly, the solid fuel is stably supplied to the rotary grate 17 via the enlarged diameter portion 41 a and the slope guide portion 41 b protruding into the combustion chamber 11 . A plurality of air feed nozzles 41c are formed on the circumference of the enlarged diameter portion 41a so that the combustion air supplied from the lower combustion air supply pipe 43 is introduced into the combustion chamber 11.

In addition, the upper end portion of the supply unit 40 protruding from the lower combustion air supply pipe 43 into the combustion chamber 11 includes an air supply diameter enlarged portion 43a whose diameter gradually increases upward and is located at the diameter enlarged portion 41a of the fuel supply pipe 41 and the upper end of the air supply diameter enlarged portion 43a is closed by the inclined surface guide portion 41b of the fuel supply pipe 41. Thus, the combustion air supplied through the lower combustion air supply pipe 43 is guided by the air supply diameter enlarged portion 43a, and then supplied to the bottom of the fuel through a plurality of air supply nozzles 41c formed at the fuel supply The enlarged diameter portion 41a on the upper side of the tube 41.

At the same time, an air supply unit (such as an annular blower) can be set on the other side of the bottom of the fuel supply pipe 41, so that the combustion air can be supplied through the fuel supply pipe 41 to prevent the solid fuel burned in the combustion chamber 11 from falling back into ( reversed into) is stored in the solid fuel in the fuel supply pipe 41.

According to the above configuration, the solid fuel is supplied to the center of the upper surface of the rotary grate 17 through the fuel supply pipe 41, and the combustion air is directly supplied to Bottom of solid fuel.

The delivery screw unit 42 formed in the fuel supply pipe 41 to deliver the fuel into the combustion chamber 11 includes a screw shaft 42d and a helical screw blade 42e formed on the screw shaft 42d. The transfer screw unit 42 is rotated by a motor (not shown) and transfers fuel. In addition, the upper portion 42 a of the screw shaft 42 d extends outside the fuel supply pipe 41 and protrudes into the combustion chamber 11 . A radial fuel supply member 42b that radially supplies fuel into the combustion chamber 11 through a fuel supply pipe 41 is formed at an upper portion 42a of the protruding screw shaft 42d.

The radial fuel supply member 42b is orthogonal to the axial direction of the screw shaft 42d and protrudingly formed to rotate together with the screw so as to radially supply the fuel rising through the fuel supply pipe 41 into the combustion chamber 11 . As previously described, the solid fuel supplied from the fuel supply pipe 41 is continuously radially supplied into the combustion chamber 11, and thus clogging of the air supply nozzle 41c by cinders can be prevented.

In addition, the fuel level control bracket 42c is formed to protrude perpendicularly to the axial direction of the screw shaft 42d, and is attached to the end portion of the upper portion 42a of the screw shaft 42d protruding into the combustion chamber 11. As shown in FIG. 7, the fuel level control bracket 42c has a conical upper portion structured such that its lower surface is blocked relative to the axial direction of the screw shaft 42d so that the fuel is not continuously moved upward but is pushed outward. Therefore, the height of the fuel on the enlarged-diameter portion 41a charged into the combustion chamber 11 and the upper portion of the combustion grate 17 can be properly controlled, thus ensuring ideal combustion of the fuel.

Meanwhile, as shown in FIGS. 3 and 4 , a gas discharge unit 30 is mounted to the upper portion of the combustion container 10 and formed in a hollow shape. High-temperature gas generated by burning solid fuel in the combustion chamber 11 enters the U-shaped flow gas chamber 50 through the gas discharge unit 30 . The lower part of the gas discharge unit 30 communicates with the upper part of the combustion container 10 , and one side of the side of the gas discharge unit 30 communicates with the U-shaped flow gas chamber 50 . A serrated water pipe 34 is formed in the side wall 32 and the upper wall 33 constituting the wall body 31 (forming the main body of the gas discharge unit 30 ) and connected to each other. As shown in FIG. 2 , water enters the water pipe 34 of the gas discharge unit 30 from the water tank 75 through the water delivery pipeline 76 . Since the wall body 31 is heated by the gas, the water circulating in the water pipe 34 of the gas discharge unit 30 becomes steam. The steam is collected into the steam drum 70 through the steam line 71 , and then the steam collected in the steam drum 70 is supplied to industrial facilities together with the steam generated in the boiler 200 . Preferably, the main body of the gas discharge unit 30 is made of steel material. In the example of the present invention shown in FIG. 4 , the water pipe 34 is buried inside the wall body 31 , but the water pipe 34 can also be arranged outside the wall body 31 .

With this configuration, although the gas discharge unit 30 is continuously exposed to high-temperature gas, the temperature of the gas discharge unit 30 can be lowered through the water pipe 34 located in the main body of the gas discharge unit 30, thereby improving the durability of the gas discharge unit 30, and The steam generated as the water circulates in the water pipe 34 is provided to the industrial facility, thereby increasing the steam production. In addition, the main body of the gas discharge unit 30 is made of steel material. Compared with the existing gas discharge unit formed by the refractory wall main body, due to the difference in material, the adhesion of ash or limited particles in the gas can be greatly reduced.

The U-shaped flow gas chamber 50 is installed between the gas discharge unit 30 and the gas collection chamber 60 so that gas introduced from the gas discharge unit 30 can be collected into the gas collection chamber 60 through the U-shaped flow gas chamber 50 . The U-shaped flow gas chamber 50 is formed in a hollow shape. The air inlet 57 is formed on the left side of the U-shaped flow gas chamber 50, and the gas outlet 58 is formed on the upper side of the U-shaped flow gas chamber 50. The gas enters from the gas discharge unit 30 through the air inlet 57 and is discharged through the gas outlet 58. to the plenum 60. In addition, water pipes 54 arranged in a zigzag shape are formed in the wall body 51 , which forms the main body of the U-shaped flow gas chamber 50 . Water enters the water pipe 54 of the U-shaped flow gas chamber 50 from the water tank 75 through the water delivery line 76 . Since the wall body 51 is heated by the gas, the water circulating in the water pipe 54 of the U-shaped flowing gas chamber 50 becomes steam. The steam is collected into the steam drum 70 through the steam line 71 , and then the steam collected in the steam drum 70 is supplied to industrial facilities together with the steam generated in the boiler 200 . In this example of the present invention, the water pipe 54 is buried inside the wall main body 51 , but the water pipe 54 may also be provided outside the wall main body 51 .

In addition, the U-shaped flow gas chamber 50 includes: an ash collector 56 and an ash conveying pipe 56a, and the ash collector 56 is located at the lower end of the U-shaped flow gas chamber 50, so as to collect the ashes contained in the gas passing through the U-shaped flow gas chamber 50 , the ashes collected by the ashes collector 56 are sent away by the ashes conveying pipe 56a. The ash conveying screw 56b is installed in the ash conveying pipe 56a. The U-shaped flow gas chamber 50 also includes a U-shaped flow guide plate 59 extending downward from the top of the U-shaped flow gas chamber 50 so as to easily discharge ash contained in the internal gas passing through the U-shaped flow gas chamber 50 .

In addition, an inclined portion 51 a is formed in front of a lower portion of the U-shaped flow gas chamber 50 to easily collect ash contained in the gas into the ash collector 56 . In this way, most of the ashes produced after the combustion of the fuel in the combustion chamber 11 are discharged through the ash discharge port 19 in the combustion chamber 11, and the few remaining ashes in the combustion gas can be discharged through the ash collector 56 of the U-shaped flow gas chamber 50 . In this way, the amount of pollutants (such as ash contained in the gas) entering the boiler 200 can be reduced.

The plenum 60 is connected to the U-shaped flow gas chamber 50 of the plurality of combustion devices 100 , and collects high-temperature gas generated in the plurality of combustion devices 100 into one place to supply to the boiler 200 .

A plurality of air inlet units 61 connected to the gas discharge unit 58 attached to the U-shaped flow gas chamber 50 of each combustion device 100 is formed linearly at the lower portion of the gas collection chamber 60 so that the combustion device 100 The longitudinal direction of the chambers 60 is arranged in a straight line.

In addition, a gas outlet unit 62 for supplying collected gas to the boiler 200 is formed at one side of the gas collection chamber 60 . As the introduced gas moves toward the boiler 200, and the inner cross-sectional area of the plenum 60 gradually becomes larger as it goes toward the gas outlet unit 62, the gas introduced from the plurality of combustion devices 100 in the plenum 60 increases, In this way, the gas entering the plenum 60 enters the boiler 200 through the gas outlet unit 62 .

In the same manner as the gas discharge unit 30 , the water pipe 64 is provided in a zigzag shape in the wall body 63 forming the gas collection chamber 60 . Water enters the water pipe 64 of the plenum 60 from the water tank 75 through the water delivery line 76 where it circulates and becomes steam. The steam is collected into the steam drum 70 through the steam line 71 , and then the steam collected in the steam drum 70 is supplied to industrial facilities together with the steam generated in the boiler 200 . With this configuration, water circulates in the water pipe 64, the temperature of the air collection chamber 60 is lowered, thereby improving the durability of the air collection chamber 60, and the steam generated when the water circulates in the water pipe 64 is supplied to the industrial facilities, thereby Increased water vapor production.

In the existing heat recovery system, a single boiler is equipped with a single combustion device to collect heat, and it is difficult to obtain a large amount of gas. In order to obtain a large amount of gas, the size of the combustion vessel in the combustion equipment should be made large. However, the increase in size of the combustion vessel is limited by the structural stability of the combustion apparatus. Therefore, in the existing heat recovery system, it is difficult to obtain high-pressure steam. However, as shown above, the present invention has solved the above-mentioned problems. In addition, comparing the present invention with the prior art, in order to obtain a large amount of high-pressure gas to generate steam, the heat recovery system of the prior art includes a plurality of combustion equipment equipped with respective boilers, while the heat recovery system of the present invention will be composed of multiple The gas generated by each combustion device 100 is collected in the gas collection chamber 60 , and then the collected gas is supplied to the boiler 200 . That is, the heat recovery system of the present invention has only one boiler. Therefore, the present invention has the advantages of reducing manufacturing cost and being able to supply high-pressure steam.

Boiler 200 is a water tube boiler. In order to collect heat from gas, water tube 201 is built into the boiler through which hot gas passes. As shown in FIG. 8, water supplied from the lower side water drum chamber 204 rises through the water pipe 201, thereby collecting heat from the hot gas. Then, the water is turned into steam, which is collected in the steam drum 205 . A water tube boiler is used in the present invention, but a smoke tube boiler may also be used.

Fig. 9 shows a plan view of a heat recovery system according to a second embodiment of the present invention. Differences between the heat recovery systems according to the first embodiment and the second embodiment of the present invention will be described below.

In the first embodiment of the present invention, the four combustion devices 100 are connected in a straight line with respect to the plenum chamber 60 , but the four combustion devices 100 are arranged to face opposite sides of the plenum chamber 60 two by two. Thus, according to the present embodiment, a plurality of combustion devices 100 are installed to face each other so that gas is introduced into both sides of the plenum chamber 60 . Therefore, advantageously, the length of the gas collection chamber 60 of the second embodiment of the present invention can be made shorter than that of the first embodiment of the present invention. Since other configurations and effects of the second embodiment of the present invention are the same as those of the first embodiment of the present invention, a detailed description thereof is omitted here.

In addition, the heat recovery system according to the present invention includes an air pollution preventing device which, after collecting heat from high-temperature gas of the boiler 200, purifies the gas to be discharged to the outside.

As shown in FIGS. 11 to 15 , the air pollution prevention equipment includes: a centrifugal dust collector 300 , a semi-dry reactor 400 , a dry reactor 500 and a filter dust collector 600 .

Fig. 11 shows a schematic block diagram of an air pollution prevention device according to the present invention, which purifies gas in a heat recovery system. FIG. 12 shows a schematic diagram of a centrifugal dust collector in the air pollution prevention apparatus of FIG. 11 . FIG. 13 shows a schematic diagram of a semi-dry reactor in the air pollution prevention apparatus of FIG. 11 . FIG. 14 shows a schematic diagram of a dry reactor in the air pollution prevention apparatus of FIG. 11 . FIG. 15 shows a schematic diagram of a filter dust collector in the air pollution prevention device of FIG. 11 .

The role of the centrifugal dust collector 300 is to initially remove dust particles in the gas entering from the boiler 200 . The inside of the centrifugal dust collector 300 is divided into an upper chamber 307 and a lower chamber 308 by a horizontal wall 303 . In the lower chamber 308 , a gas inlet 301 through which gas enters is formed only below the lateral wall 303 . A plurality of centrifugal separation containers 302 are connected to each other, and each centrifugal separation container 302 is located in the tangential direction of the inner circumferential surface connecting the gas inlet 301 . On the lateral wall 303 is formed a duct 304 which is formed lengthwise downward from the inside of the centrifuge container 302 . The gas flows out through the gas outlet 305 formed on one side of the upper chamber 307 on the upper side of the transverse wall 303 . The lower portion of the centrifugal dust collector 300 forms an inner shape that narrows as it goes toward a lower end, so that particles can be easily collected and discharged. A discharge valve 306 for discharging pollutants discharged from the centrifugal separation container 302 is provided at a lower end of the centrifugal dust collector 300 .

With such a configuration of the centrifugal dust collector 300, the gas entering from the boiler 200 through the gas inlet 301 is swirled and descended. The particles contained in the gas rotate along the inner wall of the centrifuge container 302 due to the centrifugal force, and then are collected in the lower part of the centrifuge container due to the weight of the particles. As shown above, the gas after the primary particle removal is delivered to the upper chamber 307 through the conduit 304 and then discharged through the gas outlet 305 .

The semi-dry reactor 400 functions to remove harmful acid gases such as hydrogen chloride (HCl) and sulfur oxides (SOx) in the gas, and is formed in a hollow shape. Gas enters from the centrifugal dust collector 300 through a gas inlet 401 formed at the upper end of the semi-dry reactor 400 . A liquid slaked lime supply unit 402 that supplies liquid slaked lime to the inside of the semi-dry reactor 400 is formed on one side of the upper portion of the outer peripheral surface of the semi-dry reactor 400 . In addition, the nozzle 403 connected with the liquid slaked lime supply unit 402 is installed on the upper side of the interior of the semi-dry reactor 400, and the gas outlet 405 is formed on one side of the lower part of the semi-dry reactor 400, after the gas has been introduced into the semi-dry reactor. In the case of the inside of the reactor 400 , the gas from which the harmful acid gas has been removed by the liquid slaked lime is discharged from the gas outlet 405 . A discharge valve 404 is provided at the lower end of the semi-dry reactor 400, and the discharge valve 404 is used to discharge the lime that has reacted with the gas.

With this configuration of the semi-dry reactor 400, the gas that has been supplied into the semi-dry reactor 400 reacts with the liquid slaked lime. Correspondingly, the harmful acid gas is removed, and then the gas is discharged through the gas outlet 405 . In other words, the semi-dry reactor 400 functions to remove harmful acid gases from the gas by liquid slaked lime, and at the same time lower the temperature of the gas.

The dry reactor 500 functions to remove dioxins in the gas and simultaneously remove moisture contained in the gas while reacting with the liquid slaked lime in the semi-dry reactor 400 . The dry reactor 500 has the following structure: a left part 502 , a central part 503 and a right part 506 communicate with each other in sequence along the gas transmission direction. Gas enters through a gas inlet 501 formed at the left end of the left portion 502 . Along the gas transmission direction, the internal cross-sectional area of the left part 502 gradually decreases as it goes to the right, and remains consistent with the central part 503 . Then, the inner cross-sectional area of the right portion 506 becomes progressively larger again. Gas is discharged through a gas outlet 507 formed at the right end of the right portion 506 .

In addition, an activated carbon supply unit 504 that supplies activated carbon to the inside of the dry reactor 500 and a quicklime powder supply unit 505 that supplies quicklime powder to the dry reactor 500 are provided at the center portion 503 internal. Since the cross-sectional area of the central portion 503 is smaller than that of the adjacent portions, the internal pressure of the central portion 503 is lower than that of the adjacent portions. Therefore, activated carbon and quicklime powder can be sucked from the activated carbon supply unit 504 and the quicklime powder supply unit 505 into the center part 503 where the pressure is low. In this way, it is easier to supply activated carbon and quicklime powder to the center portion 503 .

With this configuration of the dry reactor 500 , activated carbon supplied from the activated carbon supply unit 504 absorbs and removes dioxin from the gas supplied to the inside of the dry reactor 500 . In order to prevent the bag filter 604 in the filter dust collector 600 described later from being clogged with moisture, the moisture is absorbed and removed by the quicklime powder supplied from the quicklime powder supply unit 505, and the gas after the moisture removal passes through The gas outlet 507 is discharged.

The function of the filter dust collector 600 is to remove the last remaining dust contaminants in the gas before the gas is discharged into the atmosphere. The interior of the filter dust collector 600 is formed in a hollow shape. The inner space of the filter dust collector 600 is divided into an upper chamber 603 and a lower chamber 602 by a partition wall 601 . A plurality of bag filters 604 are arranged in parallel to each other on the lower surface of the partition wall 601 . A Venturi tube 605 communicating with the upper opening of the bag filter 604 is attached to the upper surface of the partition wall 601 . In addition, gas enters through a gas inlet 606 formed on one side of the lower chamber 602 ; gas is discharged through a gas outlet 607 formed on one side of the upper chamber 603 .

In addition, a compressed air supply unit 608 controlled by a solenoid valve 609 is installed outside the upper chamber 603 , and a compressed air nozzle 610 is provided inside the upper chamber 603 , and the compressed air nozzle 610 is connected to the compressed air supply unit 608 . In addition, a plurality of nozzles 611 facing the venturi 605 are formed on the compressed air nozzle 610 .

With this configuration of the filter dust collector 600, the remaining particles in the gas entering from the dry reactor 500 through the gas inlet 606 are collected in the bag filter, and the filtered gas passes through the gas outlet 607 and is driven by the induced draft fan ( introduced draft fan) 700 forced inhalation. Then, the gas is discharged through the chimney 800 . Additionally, the contaminants collected in the bag filter 604 should be removed within a certain period of time. Compressed air is controlled by a solenoid valve 609 , and is supplied from a compressed air supply unit 608 to a compressed air nozzle 610 , and then supplied to a bag filter 604 located on a lower side of a venturi 605 through a nozzle 611 . The pollutants collected in the bag filter 604 are removed, and the pollutants removed from the bag filter 604 are then discharged to the outside through the discharge valve 612 installed at the bottom of the lower end of the filter dust collector 600 .

Meanwhile, in addition to the aforementioned configuration of the heat recovery system, the combined heat and power system according to the present invention further includes: a steam turbine 250 , and an electric generator 260 connected to the steam turbine 250 . Fig. 10 shows a schematic block diagram of a combined heat and power system according to the present invention.

The steam turbine 250 receives all or part of high-pressure steam generated at the boiler, and rotates turbine blades, thereby obtaining mechanical energy. The power generator 260 generates electricity from mechanical energy. Since existing steam turbines and generators may be applied to the steam turbine 250 and the electric power generator 260, detailed descriptions thereof will be omitted.

Referring to FIG. 10 , the combined heat and power system according to the present invention will be described below. A part of the high-pressure steam generated in the boiler 200 generates power through the steam turbine 250, and the high-pressure steam becomes low-pressure steam.

Thus, with this configuration of the cogeneration system according to the present invention, a part of the high-pressure steam is used to generate electricity through the steam turbine 250, and then the high-pressure steam is changed into low-pressure steam. In this way, it is possible to apply electricity together with high-pressure and low-pressure steam to a factory or industrial facility applying a combined heat and power system.

Hereinafter, the operation process of the heat recovery system with improved heat recovery rate according to the embodiment of the present invention structured as above will be described.

First, a certain amount of solid fuel is supplied to the combustion chamber 11 from a fuel feeder (not shown) through a transfer screw 42 installed in a fuel supply pipe 41 . The radial fuel supply element 42b formed on the upper part 42a of the screw shaft 42d protruding into the combustion chamber 11 continuously radially supplies a certain amount of fuel into the combustion chamber 11, and the fuel rotates together with the screw shaft 42d to rise. With this configuration, the feed unit 40 raises the fuel with small and light particles, burns the fuel with the combustion air supplied from the air supply nozzle 41c, and continues the relatively large and heavy particles radially through the fuel supply element 42b. The fuel is supplied to the vicinity of the fuel supply pipe 41 in the combustion chamber 11, thereby preventing clogging of the air supply nozzle 41c by slag. Therefore, the present invention can solve the existing problem of continuously accumulating incompletely burned fuel on the upper part of the fuel supply pipe, thereby allowing the fuel to contact the combustion air with a small area, and preventing fuel from being left without being discharged from the fuel supply pipe Fuel-forming clinker in the supply pipe prevents fuel from burning.

As described above, the solid fuel supplied into the combustion chamber 11 is preheated and ignited by a preheating burner (not shown) and an ignition burner (not shown) to be combusted. The solid fuel supplied to the upper side of the rotary grate 17 burns, and as the fuel is continuously supplied, the fuel moves to the edge of the rotary grate 17 over time. Along with the combustion of the solid fuel, a part of the fuel becomes liquid, and the liquid fuel stays and burns in the V-shaped groove, whose cross-section is the same as that of the rotary grate 17 . Therefore, it is possible to solve the problem that, in the case where the cross section of the rotary grate is formed obliquely in only one direction, the liquid fuel that has been generated during the execution of the combustion process flows down. In addition, during the rotation of the rotary grate 17 , ash generated with the combustion of fuel is discharged through the ash discharge port 19 located at the edge of the rotary grate 17 .

Meanwhile, when the solid fuel is combusted in the combustion chamber 11, cooling water enters the cooling chamber 13 through the cooling water inlet 14a (formed at the outer periphery of the inner wall 12 of the combustion chamber 11) of the cooling chamber 13, and the incoming cooling water passes through the cooling water The guide plate 13a rotates and rises, thereby cooling the inner wall 12, and then the cooling water is discharged through the cooling water outlet 14b. Then, the cooling water discharged from the cooling chamber 13 enters the boiler 200 via a connecting pipe (not shown), thereby collecting heat from the hot gas through a heat exchange process. As described above, the combustion apparatus according to the present invention includes the cooling chamber 13 formed at the outer periphery of the inner wall 12 of the combustion chamber 11 , thereby preventing durability degradation due to an excessive rise in temperature of the inner wall 12 of the combustion chamber 11 . In addition, according to the combustion apparatus of the present invention, the inner wall 12 of the cooling chamber 13 preheats the cooling water through a heat exchange process before introducing it into the boiler 200, thereby collecting heat from the hot gas generated by the combustion equipment according to the present invention, And thus prevents durability degradation due to deformation, wear or cracks that may occur at the inner wall 12 of the combustion chamber 11 that is continuously exposed to hot gases, while avoiding unnecessary heat loss, thereby improving thermal efficiency.

In addition, combustion air necessary for solid fuel combustion is supplied from outside to the combustion chamber 11 through the side combustion air supply chamber 15 , the upper combustion air supply chamber 20 , and the lower gas supply pipe 43 . First, the combustion air supplied through the air supply inlet 16a is turned around and flows down in the side combustion air supply chamber 15, and is supplied to the combustion chamber 11 through the open lower portion 12a of the side combustion air supply chamber 15, wherein the air supply inlet 16a is in the A tangential direction is formed with respect to the upper part of the outer wall 16 of the cylindrical combustion vessel 10 . Thus, the combustion air can be supplied in the side combustion air supply chamber 15 , which is formed at the side facing surface of the gas chamber 11 , while turning around. In this way, although the combustion chamber 11 is small, the combustion air can directly contact most of the fuel compared with the case where the combustion air is supplied in a linear direction with respect to the fuel, thereby reducing manufacturing cost and improving thermal efficiency.

In addition, combustion air is supplied into the preheating chamber 25 through the upper side air supply inlet 26a, and the combustion air supplied to the preheating chamber 25 moves to the upper part of the preheating chamber 25, and then is supplied again through the air passage 24a of the upper intermediate wall 24. To the swirling flow supply chamber 23 , in which an upper side air supply inlet 26 a is formed in the upper side combustion air supply chamber 20 in a tangential direction to the outer wall 26 of the cylindrical combustion vessel 10 . The combustion air supplied to the swirl flow supply chamber 23 moves from the upper portion of the swirl flow supply chamber 23 to the lower portion thereof, and then passes through the combustion air supply passage 22a formed in the upper inner wall 22, from the upper side of the combustion chamber 11 while swirling. The surface is supplied to the interior of the combustion chamber 11 . Thus, the outside air moves to the upper portion of the preheating chamber 25 in the upper combustion air supply chamber 20 and then moves to the lower portion of the swirling flow supply chamber 23 . In this way, a more effective preheating effect can be obtained in the swirling flow supply chamber 23 because the moving distance of the outside air becomes longer, and at the same time, the preheating chamber 25 can perform the function of insulating the swirling flow supply chamber 23 from the outside. In addition, the role of the combustion air supplied by the side combustion air supply chamber 15 is to directly burn the solid fuel mounted on the combustion grate 17, and the role of the combustion air supplied by the upper side combustion air supply chamber 20 is to burn those The incompletely combusted matter that arises from a solid fuel that has not yet completely burned and rises, so that ideal combustion of the solid fuel is expected to be achieved.

Next, a method of injecting combustion air through the lower combustion air supply pipe 43 will be described. The combustion air supplied from the lower combustion air supply pipe 43 formed on the outside of the fuel supply pipe 41 is supplied into the combustion chamber 11 through the air supply nozzle 41c formed on the diameter-enlarged portion 41a of the fuel supply pipe 41, and then supplied to the built-in combustion chamber. The lower part of the solid fuel in the combustion chamber 11. Accordingly, the outer portion of the solid fuel charged in the combustion chamber 11 and the lower portion and the inner portion of the solid fuel are also burnt smoothly, thereby improving thermal efficiency.

Simultaneously, high-temperature hot gas generated by burning solid fuel in the combustion chamber 11 enters the gas discharge unit 30 through the open upper portion of the combustion chamber 11 , and then enters the U-shaped flowing gas chamber 50 .

Here, the water pipe 34 is built in the wall main body 31 constituting the main body of the gas discharge unit 30 . Accordingly, water circulates in the water pipe 34 , thereby cooling the temperature of the wall main body 31 . At the same time, the water is heated by hot gas while circulating, and then turns into steam. The steam is collected into the steam drum 70, thereby effectively increasing the heat recovery rate.

In addition, through the U-shaped flow guide plate 59 , the gas flow entering the U-shaped flow gas chamber 50 becomes a U-shaped flow, and limited particles such as ash contained in the gas fall through the U-shaped flow guide plate 59 . Thus, the removal of ash into the ash collector 56 is better.

In addition, although most of ash generated during fuel combustion can be discharged through the ash discharge port 19 of the combustion chamber 11 , small-sized ash remaining in the gas can be discharged through the ash collector 56 of the U-shaped flow gas chamber 50 . In this way, the amount of pollutants entering into the boiler 200, such as ash contained in the combustion gas, can be reduced. As described above, since the U-shaped flowing gas chamber 50 is provided in the present invention, it is possible to remove the ashes to enter the boiler 200 before supplying high-temperature hot gas to the boiler 200 . In this way, slag lumps can be prevented from entering the tubes of the boiler 200, so that the long-term operation of the boiler 200 can be realized, and the cleaning, maintenance and management of the boiler 200 can be facilitated. In addition, since cooling water circulates in the water pipe 54 of the U-shaped flow gas chamber 50, the temperature of the main body 51 of the U-shaped flow gas chamber 50 can be lowered. At the same time, the cooling water is heated by the hot gas while circulating, and then turns into steam. These steams are collected into the steam drum 70, thereby improving the heat recovery rate.

The gas passing through the U-shaped flow gas chamber 50 is entirely collected into the gas collection chamber 60 and then supplied to the boiler 200 . According to the prior art, in order to obtain a large amount of gas, a plurality of combustion facilities provided with respective boilers are required. That is, multiple boilers are required to generate steam according to the prior art. However, according to the present invention, the gas generated by a plurality of combustion devices 100 is collected in one place, ie, the plenum 60 , and then supplied to the boiler 200 . That is, only a single boiler is required to generate steam according to the present invention, thereby reducing manufacturing costs and providing high-pressure steam.

Through the heat exchange process of water flowing in the water pipe 201, the boiler 200 collects heat from the hot gas entering from the gas collection chamber 60, thereby generating high-pressure steam. Then, the gas discharged from the boiler 200 is purified in the above-mentioned air pollution prevention equipment, and then discharged into the atmosphere.

At the same time, part of the high-pressure steam generated by the boiler 200 is used in a combined heat and power system capable of generating electricity. Accordingly, the generated electricity and high-pressure steam are supplied to industrial facilities. In this way, the cogeneration system is used to supply electricity and steam to industrial facilities without using any external power, but the electricity generated in the cogeneration system itself is consumed, and high-pressure steam and low-pressure steam can be used simultaneously for manufacturing products. In addition, according to the present invention, the production of steam and the production of electricity are controlled according to price fluctuations of energy during operation of industrial facilities. Accordingly, it is an advantage of the present invention that the use of a heat recovery system and a combined heat and power system utilizing the heat recovery system can provide industrial facilities with maximum productivity at minimum energy costs.

As described above, although the present invention has been described in detail with reference to the limited embodiments and drawings, the present invention is not limited thereto. In other words, the combustion apparatus according to the preferred embodiment of the present invention has been described with reference to the example using solid fuel. However, the combustion apparatus according to the present invention is not limited to the example using solid fuel, but can also be applied to examples using gaseous fuel or liquid fuel. It is obvious to those skilled in the art that various modifications and changes can be made within the same technical spirit as the present invention. Of course, these modifications and changes belong to the following appended claims.

Claims (20)

1. A heat recovery system with improved heat recovery rate, comprising: a plurality of combustion devices, each of the plurality of combustion devices comprising: a combustion vessel for receiving combustion air supplied from the outside, and burning fuel housed in the combustion vessel; a supply unit for supplying the fuel to the combustion vessel; and The gas discharge unit is arranged on the upper part of the combustion container, and the lower part of the gas discharge unit communicates with the upper part of the combustion container, so that high-temperature gas is discharged through the gas discharge unit, and the high-temperature gas is passed through the Produced by the combustion of the fuel supplied by the supply unit to the combustion container; a gas collection chamber, connected to the plurality of combustion devices, for collecting the high-temperature gas generated in the plurality of combustion devices to one place; and a boiler for receiving the high-temperature gas collected in the plenum, and collecting heat from the supplied gas through a heat exchange process; Wherein, a water pipe is provided on the wall main body forming the main body of the plenum chamber, and steam generated when water circulates in the water pipe supplied to the plenum chamber is collected in the steam drum chamber and then supplied to industrial facilities, thereby Increased steam production while increasing the durability of the plenum; The system also includes: U-shaped flow gas chamber, one end of the U-shaped flow gas chamber communicates with one end of the gas discharge unit, and the other end of the U-shaped flow gas chamber communicates with one side of the gas collection chamber, so that The gas entering the gas discharge unit is collected into the gas collection chamber; the U-shaped flow gas chamber includes: water pipes arranged in a zigzag pattern on the wall body forming the body of the U-shaped flow gas chamber to circulate water in the water pipes to cool the wall body; and A U-shaped flow guide plate extending downward from the top of the U-shaped flow gas chamber so as to easily discharge the ash contained in the gas passing through the inside of the U-shaped flow gas chamber so as to flow through the U-shaped flow The gas in the gas chamber performs a U-shaped flow. 2. The heat recovery system with improved heat recovery rate according to claim 1, wherein a gas outlet unit is formed in the plenum, and the gas passes through the gas outlet unit from the plurality of combustion chambers. The equipment enters the boiler; as the introduced gas moves towards the gas outlet unit, and the internal cross-sectional area of the plenum chamber gradually becomes larger as it goes towards the gas outlet unit, from the plurality of combustion The gas introduced by the equipment increases, so that the gas entering the gas collection chamber flows out through the gas outlet unit. 3. The heat recovery system with an improved heat recovery rate according to claim 1, wherein said plurality of combustion devices are arranged to face each other around said plenum so that said gas flows from said plenum The plenum enters the plenum from both sides of the plenum into which the gas is supplied from the plurality of combustion devices. 4. The heat recovery system with improved heat recovery according to claim 1, further comprising: The ash collector is located at the lower end of the U-shaped flowing gas chamber to collect the ash contained in the gas passing through the U-shaped flowing gas chamber. [5] The heat recovery system with improved heat recovery rate according to claim 4, wherein a slope is formed in front of the lower part of the U-shaped flow gas chamber to easily collect ash. 6. The heat recovery system with improved heat recovery rate according to claim 5, wherein a water pipe is formed on the wall body forming the body of the U-shaped flow gas chamber, and after being supplied to the U-shaped flow gas chamber The steam generated when the water in the water pipe of the chamber is circulated is collected into the steam drum and then supplied to the industrial facility, thereby increasing the steam production while improving the durability of the U-shaped flow gas chamber. 7. The heat recovery system with improved heat recovery rate according to claim 6, wherein a water pipe is formed on a wall main body forming the main body of the gas discharge unit, and in the water pipe supplied to the gas discharge unit The steam generated when the water is circulated is collected in the steam drum and then supplied to industrial facilities, thereby increasing the steam production while improving the durability of the gas discharge unit. 8. The heat recovery system with improved heat recovery according to claim 7, wherein said combustion vessel of each combustion plant comprises: a cylindrical combustion chamber, surrounded by the inner wall of said combustion vessel, whereby the fuel is combusted; The cooling chamber includes a middle wall with a space between the middle wall and the outer side of the inner wall of the combustion vessel, and a cooling water inlet and a cooling water outlet respectively allowing cooling water to flow in and out are respectively formed on the lower side of the middle wall and the upper side, the intermediate wall is formed on the outer periphery of the combustion chamber, thereby making the combustion chamber Inner wall cooling; and The side combustion air supply chamber includes an outer wall spaced from the outer side of the middle wall of the cooling chamber, a combustion air supply inlet is formed on the upper side of the outer wall, and air required for combustion passes through the combustion air supply chamber. An air supply inlet is supplied from the outside, and the outer wall is formed on the periphery of the cooling chamber so that after the gas supplied through the combustion air supply inlet is received, the gas passes through the side combustion air supply chamber The open lower portion of is supplied into the combustion chamber, wherein the combustion air supply inlet is formed in a tangential direction relative to the cylindrical outer wall. 9. The heat recovery system with improved heat recovery rate according to claim 8, wherein the cooling water discharged from the cooling water outlet of the cooling chamber flows into the boiler so that the discharged cooling water for collecting heat from the gas produced by the combustion vessel. 10. The heat recovery system with improved heat recovery according to claim 9, wherein, A spiral cooling water guide plate is provided in the cooling chamber so that the cooling water entering through the cooling water inlet turns and rises. 11. The heat recovery system with improved heat recovery according to claim 10, wherein said supply unit supplying said fuel to said combustion vessel comprises: a fuel supply pipe vertically provided on the lower portion of the combustion vessel and used to guide the fuel into the combustion chamber; and a conveying screw unit installed in the fuel supply pipe, having a screw shaft and screw blades formed on the screw shaft so as to supply the fuel into the combustion chamber when the conveying screw unit rotates; The upper part of the screw shaft of the conveying screw unit extends to the outside of the fuel supply pipe, and protrudes into the combustion chamber; Wherein, a radial fuel supply element is formed on the upper part of the protruding screw shaft, the radial fuel supply element is arranged perpendicular to the axial direction of the screw shaft, and protrudingly formed; when the radial fuel supply element The radial fuel supply element radially supplies fuel rising through the fuel supply pipe into the combustion chamber while rotating together with the conveying screw unit. 12. The heat recovery system with improved heat recovery rate according to claim 11, wherein a fuel level control bracket is installed at the end of the upper part of the screw shaft protruding into the combustion chamber, the fuel level control bracket Orthogonal to the axial direction of the screw shaft and protrudingly formed so that the fuel is not conveyed upward but pushed outward. 13. The heat recovery system with improved heat recovery rate according to claim 12, wherein said supply unit is installed at the lower part of said combustion vessel, said supply unit further comprising: a lower combustion air supply pipe having a diameter larger than that of the fuel supply pipe and formed in concentric circles so as to supply gas at the bottom of the fuel at the lower part of the combustion chamber through the air supply unit ; wherein the fuel is supplied through the fuel supply pipe. 14. The heat recovery system with improved heat recovery rate according to claim 13, at the upper end of the fuel supply pipe protruding from the fuel supply pipe into the combustion chamber, further comprising: an enlarged diameter portion, the diameter of which gradually increases upward; and A slope guide portion is bent downward from an end portion of the enlarged diameter portion and formed obliquely. 15. The heat recovery system with improved heat recovery rate according to claim 14, wherein there is an air supply diameter enlarged portion at the upper end protruding from the lower combustion air supply pipe into the combustion chamber, the The diameter of the enlarged diameter portion of the air supply gradually increases upwards, and the enlarged diameter portion of the air supply is located on the lower side of the enlarged diameter portion of the fuel supply pipe; Wherein, a plurality of air supply nozzles are formed at the enlarged diameter portion of the fuel supply pipe so that the combustion air supplied from the lower combustion air supply pipe enters the combustion chamber. 16. The heat recovery system with improved heat recovery according to claim 15, further comprising: Air pollution prevention equipment for purifying gas to be discharged, wherein the air pollution prevention equipment includes: a centrifugal dust collector for receiving the gas discharged from the boiler, rotating and centrifuging the received gas to remove pollutants from the gas, and then discharging the gas from which the pollutants have been removed; The semi-dry reactor includes: a liquid slaked lime supply unit, used for supplying liquid slaked lime, located on one side of the upper part of the semi-dry reactor; a gas inlet and a gas outlet respectively allowing gas to flow in and out, formed on the semi-dry reactor; The upper and lower ends of a dry reactor; wherein the gas discharged from the centrifugal dust collector enters through the gas inlet so that liquid slaked lime supplied from a liquid slaked lime supply unit is added to the incoming gas, thereby removing the pollutants in the gas, and then discharge the gas from which the pollutants have been removed through the gas outlet; A dry reactor comprising: a gas inlet and a gas outlet respectively allowing gas to flow in and out, formed at both ends of the dry reactor; an activated carbon supply unit for supplying activated carbon, located at the center of the dry reactor and a quicklime powder supply unit for supplying quicklime powder at the center of the dry reactor; wherein the activated carbon and the quicklime powder are added to the gas entering from the semi-dry reactor, thereby removing pollutants in the gas, and then discharging the gas from which pollutants have been removed through the gas outlet; and A filter dust collector, including a plurality of bag filters located therein, passes the gas entering from the dry reactor through the bag filters, thereby removing pollutants in the gas. 17. The heat recovery system with improved heat recovery rate according to claim 16, wherein the centrifugal dust collector is formed as a hollow tube; Wherein, the interior of the pipe body is divided into an upper chamber and a lower chamber by a transverse wall; Wherein, the gas enters through the gas inlet, and the gas inlet is formed on one side of the lower chamber; Wherein, a centrifugal separation container is provided, and the centrifugal separation container is located in the tangential direction of the inner circumferential surface connected to the gas inlet; Wherein, a conduit is formed on the transverse wall, and the conduit is formed lengthwise downward from the inside of the centrifuge container; Wherein, a gas outlet is formed on one side of the upper chamber located on the upper part of the transverse wall, and the gas flows out through the gas outlet; Thereby, the gas entering the gas inlet is rotated to collect pollutants at the lower part of the centrifugal dust collector, and then the gas guided into the duct is discharged through the gas outlet. 18. The heat recovery system with improved heat recovery according to claim 17, wherein said dry reactor comprises: The left part, the gas inlet for gas to enter is formed at the left end of the left part, and the internal cross-sectional area of the left part gradually becomes smaller as it goes to the right; a central portion having the activated carbon supply unit for supplying activated carbon and the quicklime powder supply unit for supplying quicklime powder; and The right part, the cross-sectional area of the right part gradually increases as it tends to the right, and a gas outlet for gas exhaust is formed at the right end of the right part; Wherein, the left part, the central part and the right part communicate with each other in sequence. 19. The heat recovery system with improved heat recovery rate according to claim 18, wherein the inner space of the filter dust collector is divided into an upper chamber and a lower chamber by a partition wall; The plurality of bag filters are arranged on the lower surface of the partition wall; A venturi tube communicating with the openings of the plurality of bag filters is installed on the upper surface of the partition wall; the gas inlet through which gas enters is formed on one side of the lower chamber; The gas outlet through which the gas is discharged is formed on one side of the upper chamber; A compressed air supply unit controlling compressed air supply through a solenoid valve is installed outside the upper chamber; A compressed air nozzle is provided inside the upper chamber, and the compressed air nozzle is connected to the compressed air supply unit; A plurality of nozzles facing the Venturi are formed in the compressed air nozzle. 20. A cogeneration system comprising: A heat recovery system according to any one of claims 1 to 19; and a steam turbine for supplying steam generated by heat exchange with gas in the boiler of the heat recovery system to the steam turbine, and an electric power generator for generating electricity in combination with the steam turbine, thereby Get steam and electricity.

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