KR101774953B1 - Firebox of pellet steam boiler - Google Patents

Firebox of pellet steam boiler Download PDF

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Publication number
KR101774953B1
KR101774953B1 KR1020150069784A KR20150069784A KR101774953B1 KR 101774953 B1 KR101774953 B1 KR 101774953B1 KR 1020150069784 A KR1020150069784 A KR 1020150069784A KR 20150069784 A KR20150069784 A KR 20150069784A KR 101774953 B1 KR101774953 B1 KR 101774953B1
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South Korea
Prior art keywords
reverse tank
steam
water jacket
reverse
disposed
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KR1020150069784A
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Korean (ko)
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KR20160136073A (en
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윤성구
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윤성구
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/34—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water chamber arranged adjacent to the combustion chamber or chambers, e.g. above or at side
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1845—Arrangement or mounting of combustion heating means, e.g. grates or burners using solid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H2230/00—Solid fuel fired boiler

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

The present invention relates to a firebox for a pellet steam boiler for heating water in a water tube by heat generated by combustion of pellets in a pellet steam boiler for producing steam using pellets as fuel.
The firebox for a pellet steam boiler according to the present invention is composed of an outer cylinder 310, an intermediate cylinder 320 and an inner cylinder 330 and is provided with an intermediate cylinder 320 between the outer cylinder 310 and the inner cylinder 330, The inner cylinder 330 is composed of the lower solid portion 331 and the upper cylindrical portion 332 and the lower solid portion 331 is formed in the shape of a convex jar A water jacket WJ is formed in the inner tube 330 and a water jacket WJ is formed in the lower concrete part 331 And a second water jacket WJ2 formed on the upper cylindrical portion 332. Steam is generated in the upper space portion of the second water jacket WJ2, The primary head box 370 is disposed on the upper portion of the upper water jacket 332 and the secondary head box 380 is disposed on the upper portion of the primary head box 370, WJ2) generated steam And is supplied to the secondary head box 380 for discharging steam through the primary head box 370. [

Description

FIREBOX OF PELLET STEAM BOILER FOR PELLET STEAM BOILER

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a firebox for a pellet steam boiler for heating water by heat generated by combustion of pellets in a pellet steam boiler for producing steam using pellets as fuel, A water jacket is formed in the lower sphere part and the upper cylindrical part so that the water jacket is wound around the periphery of the flame combustion space, The present invention relates to a firebox for a boiler.

Korean Patent No. 10-1389507 (registered on Apr. 21, 2014), "Pellet boiler" is introduced.

In the pellet boiler, the firebox of the second embodiment is constituted by a lower cylinder, an upper cylinder, an upper cylinder and an upper cylinder for generating steam, and a second flange formed around the upper end of the lower cylinder is formed around the lower end of the upper cylinder 3 flange, the lower end of the upper inner cylinder is welded to the upper end of the vertical portion of the lower cylinder, an upper inner cylinder is disposed inside the upper outer cylinder, an upper intermediate cylinder is disposed between the upper outer cylinder and the upper inner cylinder, A first gas passage is formed in the upper inner cylinder, a second gas passage is formed between the upper upper inner cylinder and the upper intermediate cylinder, and a third gas passage A combustion gas discharge pipe is connected to the upper outer cylinder, a first spiral tube wound in a spiral shape is disposed in the first gas passage, and a spiral wound member A second water jacket is disposed in the middle of the first spiral tube and a second water jacket is disposed in the middle of the second spiral tube, A third water jacket is mounted in the middle of the third spiral tube, water is supplied to the first to third spiral tubes through the distribution pipe, respectively, and the first to third water jackets are connected to each other And the water is supplied to the first to third helical tubes respectively so that the water is changed into steam in the first to third water jackets and the steam is changed in the heads in the first to third water jackets And the steam is discharged from the head box.

However, the conventional firebox for a pellet boiler as described above has a large heat loss and does not mention a structure for allowing combustion in the lower box to be well performed, and has a disadvantage that it can not withstand high pressure.

Accordingly, it is an object of the present invention to provide a flame burning apparatus and a flame burning apparatus, wherein the inner cylinder is composed of a lower rigid portion and an upper cylindrical portion, A water jacket is formed on the lower sphere part and the upper cylindrical part so that the water jacket surrounds the periphery of the flame combustion space and all the heat generated by the combustion of the flame heats water filled in the water jacket The heat is discharged to the outside can be minimized and it is possible to withstand the high pressure generated in the flame combustion owing to the structural characteristic of the sphere of the lower sphere part and thereby the life time of the steam boiler is increased, .

It is another object of the present invention to provide a fuel cell system in which a reverse tank is composed of first to fourth reverse tanks, a cylindrical reverse tank is arranged to surround the other reverse tank, and each of the reverse tanks is connected by a connecting pipe, It is possible to sufficiently absorb the heat of the combustion gas and to be able to quickly produce steam and to minimize the discarded heat, and the water level of the reverse tank and the upper cylindrical portion can be minimized And each of the reverse tanks is disposed in a gas passage through which the combustion gas is discharged to recover the heat of the combustion gas.

According to an aspect of the present invention, there is provided a firebox for a pellet steam boiler comprising an outer cylinder, an intermediate cylinder, and an inner cylinder, and a first gas passage and a second gas passage are formed between the outer cylinder and the inner cylinder by an intermediate cylinder The inner cylinder is composed of the lower concrete part and the upper cylinder part, the lower concrete part is formed in the shape of the convex jar, the spherical flame combustion space is formed in the lower concrete part, the lower end of the upper cylinder part is connected to the upper hole of the lower concrete part A water jacket is formed in the inner tube, and a water jacket is constituted by a first water jacket formed on the lower solid portion and a second water jacket formed on the upper cylindrical portion, the water supplied to the lower end of the first water jacket, Steam is generated in the upper space portion of the second water jacket, the primary head box is disposed on the upper cylindrical portion, and the primary head box And the steam generated in the second water jacket of the upper cylindrical portion is supplied to the secondary head box for discharging steam to the outside through the primary head box.

In addition, in the firebox for a pellet steam boiler according to the present invention, a cylindrical reverse tank for regulating the water level and generating steam is disposed around the upper cylindrical portion of the inner cylinder, and the upper end of the upper cylindrical portion and the upper end of the reverse tank are arranged at the same height The water tube group is disposed at the lower part of the reverse tank so that water supplied to the first water jacket of the lower concrete part is supplied to the reverse tank through the water tube group and the steam tube group is disposed at the upper part of the reverse cylinder and the reverse tank The steam generated in the second water jacket and the reverse tank of the upper cylinder is supplied to the steam tube group, the primary head box is disposed on the upper part of the steam tube group, the secondary head box And the steam of the steam tube group is supplied to the secondary head box through the primary head box.

Wherein the reverse tank is composed of first to fourth reverse tanks, a cylindrical first reverse tank is disposed around the upper cylindrical portion, a cylindrical second reverse tank is disposed around the first reverse tank, A cylindrical third reverse tank is disposed around the tank, a cylindrical fourth reverse tank is disposed around the third reverse tank, a second water jacket of the upper cylindrical portion and a first reverse tank are connected to a plurality of first connection pipes The first reverse tank and the second reverse tank are connected by a plurality of second connection pipes, the second reverse tank and the third reverse tank are connected by the plurality of third connection pipes, The tank and the fourth reverse tank are connected by a plurality of fourth connecting pipes, the first reverse tank and the second reverse tank are disposed in the first gas passage, Characterized in that the greater and the fourth reverse-tank disposed in the second gas passage.

The water tube group is disposed in the upper cylindrical portion of the inner tube, and is disposed between the reverse tank and the lower portion of the inner tube. A plurality of tube tubes formed in a ring shape are arranged in a matrix form, And are vertically and horizontally connected by a connector.

The steam tube group is disposed between the primary head box and the reverse tank, and a plurality of tube tubes formed in a ring shape are arranged in a matrix form, and each tube tube is vertically and horizontally connected by a connection tube .

Wherein a check window is formed on the lower portion of the outer tube and the inner tube.

Accordingly, the firebox for the pellet steam boiler according to the present invention easily rises to the flame combustion space, the flame is burned well due to the expanded flame burning space, and the heat generated by the combustion of the flame is discharged to the water jacket It is possible to minimize discarding of the heat to the outside and to withstand the high pressure generated in the flame combustion owing to the structural characteristics of the sphere of the lower sphere portion, so that the life of the steam boiler is increased, It is possible to sufficiently absorb the heat of the combustion gas, to produce a sufficient amount of steam quickly, and to recover the heat of the combustion gas to minimize the heat that is thrown away.

1 is a cross-sectional view schematically showing a pellet steam boiler according to the present invention;
2 is a partially cutaway perspective view showing a firebox for a pellet steam boiler according to the present invention.
FIG. 3 is a schematic cross-sectional view showing a part of a firebox for a pellet steam boiler according to the present invention,
4 is a cross-sectional view taken along the line AA of Fig. 2 showing the arrangement of the primary headbox
5 is a cross-sectional view of a firebox for a pellet steam boiler according to the present invention;
6 is an enlarged view showing a part of a firebox for a pellet steam boiler according to the present invention
7 is a cross-sectional view taken along the line BB in Fig. 6 showing the water tube group

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

1, generally, a pellet steam boiler comprises a furnace 10 for burning pellets, a pellet feeder 20 for feeding the pellets into a furnace 10, And a firebox (30) for heating water by heat generated by combustion of the pellets to generate steam.

1 and 3, a firebox 30 for a pellet steam boiler according to the present invention includes an outer cylinder 310, an intermediate cylinder 320, and an inner cylinder 330, A first gas passage GP1 and a second gas passage GP2 are formed between the inner cylinder 310 and the inner cylinder 330 and the inner cylinder 330 is composed of the lower specific portion 331 and the upper cylinder portion 332 The lower bulb portion 331 is formed in a convex jar shape so that a spherical shaped flame combustion space 335 is formed in the lower bulb portion 331 and the upper bulb portion 331 is provided with an upper cylindrical portion 331, A water jacket WJ is formed on the inner tube 330 and a water jacket WJ is connected to the lower end of the first water jacket WJ1 formed on the lower solid portion 331 and the upper cylindrical portion 332 The water supplied to the lower end of the first water jacket WJ1 is supplied to the second water jacket WJ2 through the first water jacket WJ1 and the water supplied to the lower end of the second water jacket WJ2 is supplied to the second water jacket WJ2, Top of water jacket (WJ2) The primary head box 370 is disposed on the upper portion of the upper cylindrical portion 332 and the secondary head box 380 is disposed on the upper portion of the primary head box 370, The steam generated in the second water jacket WJ2 of the steam generator 332 is supplied to the secondary head box 380 for discharging steam to the outside through the primary headbox 370. [

Referring to FIG. 4, the primary head box 370 is formed in the shape of a straight tube having one end closed, and four are arranged in a cross shape, thereby connecting the first gas passage GP1 and the second gas passage GP2 The flow of the combustion gas discharged to the outside is not interfered with.

Reference numeral 390 denotes a water level meter for measuring the water level of water filled in the second water jacket WJ2.

The flask chamber for a pellet steam boiler according to the present invention is configured such that the flame combustion space 335 inside the lower rigid portion 331 is relatively wider than the furnace 12 (see FIG. 1) of the furnace 10 The flame of the flue easily ascends into the flame combustion space 335 and the flame is burned well due to the expanded flame combustion space 335 and the first water jacket WJ1 surrounds the circumference of the flame combustion space 335 Since all the heat generated by the combustion of the flame is used to heat the water filled in the first water jacket WJ1, it is possible to minimize discarding of heat to the outside, and the structural characteristics of the sphere of the lower sphere part 331 It is possible to withstand the high combustion pressure generated in the flame combustion, and the life of the steam boiler is increased.

5 and 6, a firebox 30 for a pellet steam boiler according to the present invention includes a cylindrical reverse tank (not shown) for adjusting the water level and generating steam around the upper cylindrical portion 332 of the inner cylinder 330, The upper end of the upper cylindrical portion 332 and the upper end of the reverse tank 340 are disposed at the same height and the water tube group 350 is disposed at the lower portion of the reverse tank 340, Water supplied to the first water jacket WJ1 of the first water jacket 331 is supplied to the reverse tank 340 through the water tube group 350 and steam is supplied to the upper portion of the upper cylindrical portion 332 and the reverse tank 340 The tube group 360 is disposed such that the steam generated in the second water jacket WJ2 and the reverse tank 340 of the upper cylindrical portion 332 is supplied to the steam tube group 360, The primary head box 370 is disposed on the top of the primary head box 370 and the secondary head box 380 is disposed on the top of the primary head box 370, The steam (360) through the first headbox 370 is fed to a secondary head box (380).

Thereby, the firebox for the pellet steam boiler according to the present invention is constructed such that the water surface is located at the midpoint of the reverse tank 340 and the second water jacket WJ2 is connected to the reverse tank 340 and the plurality of connection pipes 345 The water surface of the second water jacket WJ2 and the water surface of the reverse tank 340 are located at the same height so that steam is generated in the second water jacket WJ2 as well as in the reverse tank 340 The steam generated in the upper cylindrical portion 332 and the reverse tank 340 is further sucked by the combustion gas in the course of passing through the steam tube group 360. [ It is possible to minimize the generation of condensed water during the process of supplying steam to the place of use through the primary head box 370 and the secondary head box 380 by the heating and overheating, And the second gas passage GP2 The heat of the water in the water tube group 350 and the steam in the steam tube group 360 are exchanged in the course of the overflow, thereby minimizing the discoloration of the heat of the combustion gas.

Referring to FIGS. 5 and 6, in the flask chamber for a pellet steam boiler according to the present invention, the reverse tank 340 includes first to fourth reverse tanks 341, 342, 343, and 344 A cylindrical first reverse tank 341 is disposed around the upper cylindrical portion 332 and a cylindrical second reverse tank 342 is disposed around the first reverse tank 341, A cylindrical third reverse tank 343 is disposed around the reverse tank 342 and a cylindrical fourth reverse tank 344 is disposed around the third reverse tank 343 and the upper cylindrical portion 332, The second water jacket 334 and the first reverse tank 345 are connected by the first connection pipes 345a and the first reverse tank 341 and the second reverse tank 342 are connected to each other by a plurality of And the second reverse tank 342 and the third reverse tank 343 are connected to each other by a plurality of third connection pipes 3 And the third reverse tank 343 and the fourth reverse tank 344 are connected by a plurality of fourth connection pipes 345d and the first reverse tank 341 and the second reverse tank 341 342 are disposed in the first gas passage GP1 and the third reverse tank 343 and the fourth reverse tank 344 are disposed in the second gas passage GP2.

This allows the reverse tank 340 to be constituted by the first to fourth reverse tanks 341, 342, 343 and 344 and the first and second reverse tanks 341 and 342 to communicate with the first gas passage GP1. And the third and fourth reverse tanks 343 and 344 are disposed in the second gas passage GP2 so that the contact area with the combustion gas is large and the heat of the combustion gas can be sufficiently absorbed, Not only can it be produced, but also the heat that is discarded can be minimized.

The fourth reverse tank 344 is connected to a water level meter 390 disposed outside the outer cylinder 310 by a plurality of fifth connecting pipes 345e.

This makes it possible to measure the water level of the water filled in the first to fourth reverse tanks 341, 342, 343, 344 and the second water chamber 332 through the water level meter 390.

5 to 7, the water tube group 350 is disposed in the upper cylindrical portion 332 of the inner cylinder 330 and is disposed between the reverse tank 340 and the lower concrete portion 331 of the inner cylinder 330 And a plurality of tube tubes 351, 352, 353, ..... formed in a ring shape are arranged in a matrix form, and each tube tube is vertically and horizontally connected by horizontal and vertical connection tubes.

That is, the first 1 tube tube 351 is disposed around the lower end of the upper cylindrical portion 332, the first 2 tube tube 352 is disposed around the first 1 tube tube 351, A second x 1 tube tube 355 is arranged on the first x 1 tube tube 351 in such a manner that a first x 3 tube tube 353 is disposed around the first x 2 tube tube 352, And the tube tubes of the remaining matrices are also arranged in the above manner. The first x1 tube 351 is connected to the lower sphere 331 by a vertical connection pipe CP1 and the first x1 tube 351 and the first x2 tube 352 are connected to each other. The first × 1 tube tube 351 and the second × 1 tube tube 354 are connected by a vertical connection pipe CP3 and the tube tube of another matrix is connected by a horizontal connection pipe CP2, And are vertically and horizontally connected by a connector, so that the water of each tube can communicate with each other.

The steam tube group 360 is disposed between the primary head box 370 and the reverse tank 340 and a plurality of tube tubes formed in a ring shape like the water tube group 350 described above are arranged in a matrix form , And each tube tube is vertically and horizontally connected by a connector tube.

An inspection window (not shown) is formed on the lower concrete part 331 of the outer cylinder 310 and the inner cylinder 330.

This confirms that the pellet is burned through the inspection window.

The structure of the outer cylinder and the intermediate cylinder, the structure of the gas passage through which the combustion gas passes and the constitution of the combustion gas discharge, and the structure for supplying the pellets to the inside of the cylinder through the firebox cylinder in the pellet supply apparatus are described in Korean Patent No. 10-1389507 "Pellet boiler" describes in detail, and a detailed description thereof will be omitted here.

Reference numeral 385 denotes a water separator for separating the condensed condensed water from the exhaust steam of the secondary head box 370.

310: outer tube 320: intermediate tube
330: inner cylinder GP1: first gas cylinder
GP2: second gas passage 340: reverse tank
350: Water tube group 360: Steam tube group
370: primary head box 380: secondary head box

Claims (6)

The first gas passage GP1 and the second gas passage G2 are formed between the outer cylinder 310 and the inner cylinder 330 by the intermediate cylinder 320. The outer cylinder 310, the intermediate cylinder 320, And the lower bulb portion 331 is formed in the shape of a convex jar so that the inside of the lower bulb portion 331 is formed in the inside of the lower bulb portion 331, And a lower end of the upper cylindrical portion 332 is connected to an upper hole of the lower solid portion 331. A water jacket WJ is formed in the inner cylindrical body 330, The water jacket WJ is constituted by a first water jacket WJ1 formed on the lower concrete part 331 and a second water jacket WJ2 formed on the upper cylindrical part 332. The lower end of the first water jacket WJ1 Is supplied to the second water jacket WJ2 through the first water jacket WJ1 and steam is generated in the upper space portion of the second water jacket WJ2 and the water supplied to the upper portion of the upper cylindrical portion 332 The primary headbox 370 And the secondary head box 380 is disposed on the upper part of the primary head box 370 so that the steam generated in the second water jacket WJ2 of the upper cylindrical part 332 is supplied to the primary head box 370, To the secondary head box 380 for discharging the steam to the outside through the second head box 380,
A cylindrical reverse tank 340 for regulating the water level and generating steam is disposed around the upper cylindrical portion 332 of the inner cylinder 330 so that the upper end of the upper cylindrical portion 332 and the upper end of the reverse tank 340 are the same And a water tube group 350 is disposed at a lower portion of the reverse tank 340 so that water supplied to the first water jacket WJ1 of the lower solid portion 331 flows through the water tube group 350 A steam tube group 360 is disposed on the upper portion of the upper cylindrical portion 332 and the reverse tank 340 so that the second water jacket WJ2 of the upper cylindrical portion 332 and the second water jacket WJ2 of the upper cylindrical portion 332 are connected to the reverse tank 340, The steam generated in the tank 340 is supplied to the steam tube group 360 and the primary head box 370 is disposed on the upper part of the steam tube group 360. In the upper part of the primary head box 370, The car head box 380 is disposed so that the steam of the steam tube group 360 is supplied to the secondary head box 380 through the primary head box 370 Pellet boilers for steam chamber through which.
delete The method according to claim 1,
The reverse tank 340 is composed of first to fourth reverse tanks 341, 342, 343 and 344 and a cylindrical first reverse tank 341 is disposed around the upper cylindrical portion 332, A cylindrical second reverse tank 342 is disposed around the first reverse tank 341 and a cylindrical third reverse tank 343 is disposed around the second reverse tank 342 and the third reverse tank 342 is disposed around the second reverse tank 342. [ The second water jacket 334 of the upper cylindrical portion 332 and the first reverse tank 345 of the upper cylindrical portion 332 are connected to a plurality of first connection pipes 345a, The first reverse tank 341 and the second reverse tank 342 are connected by a plurality of second connection pipes 345b and the second reverse tank 342 and the third reverse tank 343 are connected by the second connection pipe 345b. The third reverse tank 343 and the fourth reverse tank 344 are connected by a plurality of third connection pipes 345c, The first reverse tank 341 and the second reverse tank 342 are disposed in the first gas passage GP1 and the third reverse tank 343 and the fourth reverse tank 344 are connected to each other by the first reverse tank 341 and the second reverse tank 342. [ And is disposed in the second gas passage (GP2).
The method according to claim 1,
The water tube group 350 is disposed in the upper cylindrical portion 332 of the inner tube 330 and disposed between the reverse tank 340 and the lower solid portion 331 of the inner tube 330, Wherein a plurality of tube tubes (351, 352, 353, .....) are arranged in a matrix form, and each tube tube is vertically and horizontally connected by horizontal and vertical connection tubes. .
The method according to claim 1,
The steam tube group 360 is disposed between the primary head box 370 and the reverse tank 340. A plurality of tube tubes formed in a ring shape are arranged in a matrix form, Wherein the pellet is connected to upper, lower, left, and right sides.
The method according to claim 1,
Wherein a check window is formed on the lower concrete part (331) of the outer cylinder (310) and the inner cylinder (330).
KR1020150069784A 2015-05-19 2015-05-19 Firebox of pellet steam boiler KR101774953B1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200311774Y1 (en) 2003-01-30 2003-05-01 김가영 An industrial boiler
KR200344864Y1 (en) 2003-12-15 2004-03-18 홍열 Hot water boiler being supplied with wood or sawdust for fuel.
KR101099469B1 (en) * 2011-04-05 2011-12-27 염동섭 Downward wood burning boiler
KR101313533B1 (en) * 2010-11-30 2013-10-15 김재순 Wood pellet boiler combustion apparatus of bottom feeding type
KR101389507B1 (en) * 2012-11-19 2014-04-25 윤성구 Pellet boiler
WO2015024538A1 (en) 2013-08-19 2015-02-26 KRAJČOVÁ, Renata Circulatory heating boiler for combined production of heat, steam and electric energy

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200311774Y1 (en) 2003-01-30 2003-05-01 김가영 An industrial boiler
KR200344864Y1 (en) 2003-12-15 2004-03-18 홍열 Hot water boiler being supplied with wood or sawdust for fuel.
KR101313533B1 (en) * 2010-11-30 2013-10-15 김재순 Wood pellet boiler combustion apparatus of bottom feeding type
KR101099469B1 (en) * 2011-04-05 2011-12-27 염동섭 Downward wood burning boiler
KR101389507B1 (en) * 2012-11-19 2014-04-25 윤성구 Pellet boiler
WO2015024538A1 (en) 2013-08-19 2015-02-26 KRAJČOVÁ, Renata Circulatory heating boiler for combined production of heat, steam and electric energy

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