KR101053090B1 - Retort Type Pellet Boiler with Reburnable Double Combustor - Google Patents

Abstract

The present invention relates to a retort type pellet boiler having a double combustor capable of complete combustion and hardly generating slugs, comprising: a housing constituting a body; A dual combustion apparatus installed in the combustion unit of the housing and capable of primary combustion by external air of the pellet and secondary combustion by combustion gas; Pellet inlet for continuously supplying pellets to the dual-burner; An outside air supply unit supplying outside air to the dual-combustion unit; An ignition unit for maintaining the inside of the double combustion chamber as a combustion atmosphere; A heat exchanger connected to the combustion unit by a rising pipe; An exhaust pipe connected to the heat exchanger by a down pipe; And a reprocessing unit installed at a lower portion of the double burner.

Pellet, Pellet Boiler

Description

Retort-typed pellet boiler with dual-combustor capable of ash-treatment}

The present invention relates to a retort type pellet boiler having a reburnable double combustor, and more particularly, a retort type pellet having a double combustor capable of complete combustion and hardly generating slugs, and the ash generated during combustion can be discharged downward. It's about a boiler.

Pellet boilers are a type of wood boiler that uses pellets as fuel. Pellet is a wood fuel made of small cylindrical granules so that pure wood can be compressed at high temperature and high pressure and dehydrated for a long time.

In particular, the pellets are sawdust of wood by-products to be sorted, dried, and compressed into clean energy, and the calories are more than 4,500 kcal / kg more than twice the normal wood or chips.

Pellet boilers using such pellets are generally gun type burners, and these gun type burners have a problem in that smoke is severely generated due to incomplete combustion, fuel efficiency is low, and slugs are generated a lot.

SUMMARY OF THE INVENTION An object of the present invention devised to solve the above problems is to provide a retort type pellet boiler having a double combustor capable of complete combustion and hardly generating slugs.

The present invention for achieving the above object, the housing forming a body; A dual combustion apparatus installed in the combustion unit of the housing and capable of primary combustion by external air of the pellet and secondary combustion by combustion gas; Pellet inlet for continuously supplying pellets to the dual-burner; An outside air supply unit supplying outside air to the dual-combustion unit; An ignition unit for maintaining the inside of the double combustion chamber as a combustion atmosphere; A heat exchanger connected to the combustion unit by a rising pipe; An exhaust pipe connected to the heat exchanger by a down pipe; And it is a retort type pellet boiler comprising a reprocessing unit installed in the lower portion of the double burner.

The downcomer and the exhaust pipe may be connected by a second slug collector.

In addition, a first slug collector is disposed under the double burner.

In addition, the dual-combustor is characterized in that the temperature sensor is attached.

In addition, the dual-combustor is an upper portion of one of the main casing connected to the outside air supply unit, the partition wall partitioning the main casing, the gate is formed in the lower portion, and the space in which the main casing is divided by the partition wall A tubular main burner installed in the main casing, a tubular sub casing connected to an upper portion of the main casing by a connecting socket and opened at a lower portion thereof so as to be positioned above the main burner, and installed at the center of the sub casing and arranged on an upper side of the main casing. It characterized in that it comprises a tubular sub-burner having a side hole and a lower cover formed in the lower portion of the main burner to open and close the lower portion of the main burner and a plurality of distribution holes to allow air to flow into the lower portion of the main burner. .

The reprocessing unit may include a lower cover opening / closing part connected to the lower cover to open and close the lower cover, and a recollecting part installed below the lower cover to collect ash falling from the main casing. .

The lower cover opening and closing part may include a reprocessing driving rod for horizontally moving the lower cover connected to the lower cover, and a reprocessing driving unit for transmitting a driving force to the reprocessing driving rod.

In addition, the re-collecting unit is characterized in that it has a structure of a drawer to be easily discharged to the ash collected outside.

In addition, the outside air supply unit is characterized in that the blower for compressing and supplying the atmosphere, one end is connected to the blower and the other end is connected to the main casing of the double burner.

In addition, the ignition portion is characterized in that the one end toward the ignition port formed in the main burner side portion, the other end extends through the partition wall.

In addition, the blower is connected to the pellet inlet through the exhaust pipe, characterized in that the outside air is supplied at the same time when the pellet is injected.

In addition, the exhaust pipe and the pellet inlet is connected by a feedback tube, the feedback tube is characterized in that the feedback compressor is installed.

Through the present invention, since the pellet can be completely burned, thermal efficiency is increased, smoke generation is reduced, and slug is hardly generated.

Therefore, it is possible to improve the problems that the existing pellet boiler has, which can double the advantages of the pellet boiler, and also helps the spread of the pellet boiler.

In addition, the ash generated in the combustion can be discharged to the lower side without disassembling the device, it is possible to prevent the clogging phenomenon of the oxygen supply passage caused by the ash to always maintain a constant combustion efficiency.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In adding reference numerals to components of the following drawings, it is determined that the same components have the same reference numerals as much as possible even if displayed on different drawings, and it is determined that they may unnecessarily obscure the subject matter of the present invention. Detailed descriptions of well-known functions and configurations will be omitted.

1 is a perspective view of a retort type pellet boiler 100 having a double burner according to the first embodiment of the present invention, Figure 2 is a left side cross-sectional view of the pellet boiler (100).

The pellet boiler 100 is a housing 102 constituting a body and a double combustion unit 128 is installed in the combustion unit 134 of the housing 102 to enable primary combustion by the outside air of the pellet and secondary combustion by the combustion gas. ), A pellet inlet 106 for continuously supplying pellets to the dual combustor 128, an external air supply unit for supplying external air to the dual combustor 128, and maintaining the inside of the dual combustor 128 as a combustion atmosphere. An ignition unit, a heat exchanger 136 connected to the combustion pipe 135 by the combustion unit, an exhaust pipe 104 connected to the heat exchanger 136 by a down pipe 148, and the double burner 128 It comprises a reprocessing unit is installed at the bottom of the).

The housing 102 is preferably composed of a wall having excellent heat insulation, and the combustion unit 134 is also preferably made of a heat insulating material in order to minimize leakage of combustion heat to the outside.

The double combustor 128 is installed in the combustion unit 134, so that the pellet is completely burned in the primary and secondary. To this end, as shown in FIGS. 3 and 4, the double burner 128 divides the main casing 122 and the main casing 122 connected to the outside air supply unit. A partition wall 140 having a gate 145 formed at a lower portion thereof, and a cylindrical main burner 142 installed at an upper portion of one of the spaces in which the main casing 122 is divided by the partition wall 140; A tubular subcasing 148 connected to an upper portion of the main casing 122 by a connecting socket 146 and opened at a lower portion of the main burner 142, and a center of the subcasing 148. And a tubular subburner 150 having an upper side hole 152 formed at an upper side thereof, and positioned at a lower portion of the main burner 142 to horizontally open and close a lower portion of the main burner 142. A plurality of distribution holes 144 are formed so that air flows into the lower part of the main burner 142. It comprises a bottom cover 141.

The main casing 122 is divided into two spaces by the partition wall 140. One of the main burners 142 is installed, the other is connected to the external air supply.

A gate 145 is formed below the dividing wall 140, and the gate 145 connects spaces on both sides divided by the dividing wall 140 so that air supplied from the outside air supply unit is circulated. Do it.

In addition, in the first embodiment of the present invention, the lower cover 141 can be inserted through the gate 145. Therefore, the cross-sectional shape and size of the gate 145 is formed to correspond to the cross-sectional shape and size of the lower cover 141.

The main burner 142 is formed in a cylindrical shape of the upper and lower open, in the first embodiment of the present invention is formed so that the cross-sectional area is enlarged toward the upper side.

In addition, an ignition port 147 is formed at a lower side of the main burner 142, and hot air for heating to a temperature at which combustion is supplied from the ignition unit may be introduced into the main burner 142.

 The lower part of the main burner 142 is opened and closed by the lower cover 141. Therefore, only the upper portion of the main burner 142 during combustion may maintain a cylindrical shape.

The lower cover 141 is formed to be movable in a horizontal direction by a rail structure or the like, and is formed in a tubular shape having a quadrilateral cross section so that air can be freely distributed thereon, and the upper cover which is in contact with the lower part of the main burner 142. A distribution hole 144 is formed to allow the flow of air.

A space separated by the dividing wall 140 is formed around the main burner 142, and only outside air supplied through the gate 145 from the outside air supply unit may be distributed to the space.

In addition, a space is formed between the sub casing 148 and the sub burner 150, and the space is introduced from the combustion gas from the main burner 142 and a space around the main burner 142. The outside air and the combustion gas through the gap between the main casing 122 and the sub casing 148 formed by the connection socket 146 are circulated.

Therefore, the double burner 128 is installed by two burners spaced apart from each other by the connection socket 146 as shown in Figs. 3 and 4, the main burner 142 is the primary combustion by the outside air In the sub-burner 150, secondary combustion by combustion gas is performed.

In addition, a temperature sensor 120 is installed at one side of the double combustor 128 to measure the temperature inside the double combustor 128, and the input amount of the pellet or the heating of the heater 126 through the control unit 118. Quantity and the like can be controlled. In addition, the control unit 118 may display the state information of the pellet boiler 100 through the display unit 112.

In addition, the downcomer 138 and the exhaust pipe 104 is connected by the slug collector 132. That is, as shown in Figure 2, the combustion flue gas descending through the down pipe 138 moves together with the slug downward along the direction of movement, and again rises through the exhaust pipe 104, so in the process The slug that sinks by may be collected by the slug collection unit 132.

The heat exchanger 136 may be provided with a heat medium jacket for hot water or warm air so that water or air may cause heat exchange with the combustion gas. As shown in FIGS. 1 and 2, the heat medium inlet pipe 154 and the heat medium outlet pipe 156 may be connected to the heat medium jacket of the heat exchanger 136.

The outside air supply unit blows air to the compressed air, and one end is connected to the blower 110, and the other end is connected to the lower part of the main casing 122 of the double burner 128. Therefore, air in the atmosphere can be supplied to the double burner 128 at a constant pressure. Such supply of external air can prevent backfire (or backflow) of fire or smoke in the combustion chamber.

In addition, the ignition unit has a heater tube 124 having one end disposed close to the ignition hole 147 formed in the main burner 142 and the other end extending through the partition wall 140, and the heater tube ( 124 includes a heater 126 installed inside.

The ignition unit supplies hot air having a temperature above the flash point of the pellet to the main burner 142, thereby helping to maintain the ignition and combustion state. At this time, air to the ignition unit is supplied by the external air supply unit.

In particular, for interior repair or cleaning management, it is preferable that the door 108 is formed on one side of the housing 102. In this case, the outside air supply unit is installed in the door 108.

In addition, the control unit 118, the display unit 112 may be installed in the door 108.

Pellets inlet 106 is provided on the side of the housing 102, it is possible to continuously supply pellets. When the pellet is supplied to the inlet side of the pellet inlet 106, the pellet has a shape that is discharged to the outlet side by gravity, the outlet is located on the upper side of the dual-combuster 128, the fuel pellets from the upper side to the lower side To be supplied.

2 to 4, the lower cover opening and closing portion which is connected to the lower cover 141 to open and close the lower cover 141, and installed below the lower cover 141 Re-collecting unit 172 for collecting ash falling from the main burner 142.

In particular, wood pellet fuel may be incompletely burned according to quality, and ashes may be solidified due to such incomplete combustion, thereby blocking the distribution hole of the lower cover 141, thus preventing the supply of oxygen smoothly, and thus ignition or ignition. It may not be well maintained. Therefore, the embodiment of the present invention includes a configuration capable of dropping all remaining ash to the bottom by including such a reprocessing unit. Therefore, the inside of the double combustor 128 can always maintain the desired combustion state due to the sufficient oxygen supply through the removal of ash.

The lower cover opening and closing part may use a known technique, and in Embodiment 1 of the present invention, the reprocessing driving rod 170 connected to the lower cover 141 to open and close the lower cover 141 by a horizontal reciprocating motion. And a reprocessing drive unit 168 were used. As the reprocessing driving unit 168, a pneumatic actuator was used.

Accordingly, the lower part of the main burner 142 may be closed by the lower cover 141 in the combustion main, and only when the ash is discharged, the lower cover 141 may be opened by the reprocessing driver 168. The lower part of the main burner 142 is opened by moving. At this time, in order to limit the movement distance of the lower cover 141 is formed in the form of protruding the stopper 143 in the lower portion of the lower cover 141, the stopper 143 is a bottom portion of the housing 102 It is arranged in the opening formed in the.

As another example of the lower cover opening and closing part, the lower cover 141 may be rotated so that the ash falls down by switching from the horizontal state to the vertical state. In addition, as another example of the lower cover opening and closing portion is formed by dividing the lower cover 141, the shutter system for opening and closing the lower portion of the main burner 142 by horizontally moving or rotating the divided portions. Can be used.

In addition, when the lower part of the main burner 142 is opened, a recollection part 172 for collecting the falling ash is below the opening formed in the bottom of the housing 102 below the lower cover 141. Is installed.

The recollection portion 172 has a drawer structure that is easy to insert, withdraw from the outside.

The recollection unit 172 is not limited to the above-described structure, any structure may be used as long as it is a structure that collects ash from the main burner 142 and easily discharges it.

1 and 2, the air compressed by the blower 110 is supplied to the pellet inlet 106 through the branch pipe 158, and the fire in the combustion unit 134 is It is desirable to prevent the backflow of smoke to enable stable pellet supply. At this time, the control valve 160 may be further installed in the branch pipe 158 to adjust the compressed air amount.

The retort type pellet boiler 100 according to the first embodiment of the present invention is basically configured as described above. Hereinafter, the operation principle of the pellet boiler 100 will be briefly described with reference to FIG.

When the pellet is input through the pellet inlet 106, the pellet is dropped and accumulated at the lower portion of the main burner 142. At this time, the blower 110 is operated to supply outside air into the dual combustion chamber 128. During combustion, the lower part of the main burner 142 is closed by the lower cover 141.

In addition, the ignition opening 147 operates hot air that may operate the heater 126 inside the heater tube 124 to heat the air supplied by the blower 110 to raise the temperature to a temperature equal to or greater than the ignition point of the pellet. Supply to the bottom of the main burner 142 through. The air supplied by the blower 110 flows into the lower part of the main burner 142 via the distribution hole 144 of the lower cover 141 through the gate 145 of the partition wall 140. The rest is raised through the space around the main burner 142.

Therefore, combustion is started in the main burner 142, and other pellets which are not yet burned due to the heat of combustion at this time also burn as the temperature increases.

Therefore, the temperature inside the main burner 142 is increased, and the outside air rising through the space around the main burner 142 is also raised in temperature through heat transfer.

Since the combustion gas is a high temperature, the upward movement occurs actively, and the pressure decreases due to the increase in the flow velocity. At this time, the surrounding combustion gas flows into the gap between the main casing 140 and the sub casing 148 due to the pressure decrease caused by the rising air flow of the combustion gas.

In addition, the combustion gas raised from the main burner 142 and the combustion gas introduced into the gap between the main casing 140 and the sub casing 148 flow into the sub burner 150. At this time, the outside air and the combustion gas introduced into the gap between the main casing 140 and the sub casing 148 are mixed and supplied to the sub burner 150 through the upper side hole 152.

Through this first and second combustion process, the pellet is completely burned, and the completely burned exhaust gas moves to the riser 135, the heat exchanger 136, the downcomer 138 and the exhaust pipe 104. do.

The pellet boiler 100 can be continuously burned by supplying fuel continuously through the pellet inlet 106 and controlling the blower 110 and the heater 126 by the controller 118. Do.

In addition, the slugs are extremely low in amount due to complete combustion according to primary and secondary combustion, and are also reliably collected by the slug collecting unit 132, and can be removed when the door 108 is opened.

In addition, the ash generated in the double burner 128 may be removed by the reprocessing unit. That is, the lower cover 141 opens the lower part of the main burner 142 by the operation of the reprocessing driver 168, and the ashes in the main burner 142 are removed from the housing 102. The re-collecting portion 172 is dropped through the opening formed in the bottom portion.

Ash collected in the recollecting unit 172 may be discharged to the outside by drawing out the recollecting unit 172 in the form of a drawer.

The second embodiment of the present invention will be described below. The same reference numerals are used for the same configurations as those of the first embodiment, and description thereof will be omitted.

5 is a perspective view of a retort type pellet boiler 101 having a double burner according to a second embodiment of the present invention, and FIG. 6 is a left side cross-sectional view of the pellet boiler 101.

Unlike Embodiment 1, in Embodiment 2, in consideration of thermal efficiency, exhaust gas is used to prevent backfire and the like on the pellet inlet 106 side.

That is, in the first embodiment, since the air having a low temperature may flow into the pellet inlet 106, the thermal efficiency may be reduced. To feed back.

Accordingly, the feedback pipe 162 is provided with a feedback compressor 164 for generating feedback.

In addition, a feedback valve 166 may be installed to adjust the amount of air fed back.

As described above, it has been described with reference to the preferred embodiment of the present invention, but those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

1 is a perspective view of a retort type pellet boiler having a reburnable double burner according to Embodiment 1 of the present invention.

FIG. 2 is a left side cross-sectional view of the retort type pellet boiler of FIG. 1.

3 is a schematic diagram of a double combustor in the combustion state of the retort type pellet boiler of FIG.

Figure 4 is a schematic diagram illustrating the principle of operation of removing the ash of the double burner of the retort type pellet boiler of FIG.

5 is a perspective view of a retort type pellet boiler having a reburnable double burner according to Embodiment 2 of the present invention.

6 is a left side cross-sectional view of the retort type pellet boiler of FIG. 5.

<Description of the symbols for the main parts of the drawings>

100, 101: pellet boiler 102: housing

104: exhaust pipe 106: pellet inlet

108: door 110: blower

112: display unit 114: opening and closing mechanism

116: swing coupling portion 118: control unit

120: temperature sensor 122: main casing

124: heater tube 126: heater

128: dual burner 132: slug collecting unit

134: combustion section 135: riser

136: heat exchanger 138: downcomer

140: partition wall 141: lower cover

143: stopper 142: main burner

144: distribution hall 145: gate

146: connection socket 147: ignition port

148: subcasing 150: subburner

152: upper side hole 154: heat medium inlet pipe

156: heat medium outflow pipe 158: branch pipe

160: control valve 162: feedback tube

164: feedback compressor 166: feedback valve

168: reprocessing drive unit 170: reprocessing drive rod

172: recollection

Claims (12)

A housing forming a body; A dual combustion apparatus installed in the combustion unit of the housing and capable of primary combustion by external air of the pellet and secondary combustion by combustion gas; Pellet inlet for continuously supplying pellets to the dual-burner; An outside air supply unit supplying outside air to the dual-combustion unit; An ignition unit for maintaining the inside of the double combustion chamber as a combustion atmosphere; A heat exchanger connected to the combustion unit by a rising pipe; An exhaust pipe connected to the heat exchanger by a down pipe; And It includes a reprocessing unit is installed in the lower portion of the double burner, The double burner is installed in an upper part of a main casing connected to the outside air supply unit, a partition wall partitioning the main casing and a gate formed at a lower portion thereof, and a space in which the main casing is divided by the partition wall. A cylindrical main burner, a cylindrical sub casing connected to an upper portion of the main casing by a connecting socket to be positioned above the main burner, and having a lower opening, and an upper side hole formed at a center of the sub casing and formed at an upper side thereof. A retort-type pellet, comprising: a tubular subburner and a lower cover positioned at a lower portion of the main burner to open and close a lower portion of the main burner, and a plurality of distribution holes are formed to allow air to flow into the lower portion of the main burner. Boiler. The method of claim 1, The downcomer and the exhaust pipe is a retort type pellet boiler, characterized in that connected by the slug collector. The method of claim 1, Retort-type pellet boiler, characterized in that the temperature sensor is attached to the dual-combustor. delete The method of claim 1, The reprocessing unit includes a lower cover opening and closing portion connected to the lower cover to open and close the lower cover, and a recollecting unit installed below the lower cover to collect ash falling from the main casing. Pellet boiler. The method of claim 5, The lower cover opening and closing part, a retort driving rod for horizontally moving the lower cover is connected to the lower cover, and a retort type pellet boiler comprising a reprocessing driving unit for transmitting a driving force to the reprocessing driving rod. The method of claim 5, The recollecting unit is a retort-type pellet boiler, characterized in that it has a structure of a drawer to easily discharge the ash collected to the outside. The method of claim 1, The external air supply unit is a blower for compressing and supplying the atmosphere, and one end is connected to the blower and the other end is connected to the main casing of the dual-combustor. The method of claim 1, The retort type pellet boiler, wherein one end of the ignition portion faces the ignition hole formed at the main burner side, and the other end extends through the dividing wall. The method of claim 8, The blower is connected to the pellet inlet through the exhaust pipe, retort type pellet boiler, characterized in that the outside air is supplied at the same time when the pellet is injected. The method of claim 1, The exhaust pipe and the pellet inlet is connected by a feedback tube, the feedback tube is a retort-type pellet boiler, characterized in that the feedback compressor is installed. The method of claim 1, The exhaust pipe and the pellet inlet is connected by a feedback tube, the feedback tube is a retort-type pellet boiler, characterized in that the feedback compressor is installed.

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