KR101189969B1 - Combustor having air intake preheater and waste gas circulation structure - Google Patents

Abstract

According to the present invention, after the air introduced from the outside of the boiler is preheated while passing through the latent heat exchanger, it is mixed with a part of the waste gas of the combustion product to be supplied to the blower and the burner, thereby reducing the combustion load of the burner, thereby improving combustion efficiency and mixing. The combustion device is equipped with an air supply preheater and a waste gas circulation structure to reduce the amount of nitrogen oxide contained in the waste gas discharged through the exhaust hood by improving the turndown ratio by increasing the gas ejection speed. The purpose is to provide.
The present invention for implementing this, a burner for burning the air and fuel supplied through the blower, a sensible heat exchanger for absorbing the combustion sensible heat generated in the burner, and steam included in the combustion product after the heat exchange in the sensible heat exchanger A combustion apparatus comprising a latent heat exchanger for absorbing latent heat of the exhaust gas and an exhaust hood through which waste gas of a combustion product passing through the latent heat exchanger is discharged, wherein the latent heat exchanger includes air supplied from the outside of the boiler through an air supply port. An air supply preheating port is provided to form a flow path of air to be supplied to the burner after being heat-exchanged with the combustion product, and the air preheated through the air supply preheating port is mixed with a part of the waste gas discharged through the exhaust hood. And is supplied to the burner through an air supply pipe.

Description

Combustion apparatus with air supply preheater and waste gas circulation structure {COMBUSTOR HAVING AIR INTAKE PREHEATER AND WASTE GAS CIRCULATION STRUCTURE}

The present invention relates to a combustor having an air supply preheater and a waste gas circulation structure, and more particularly, the air introduced from the outside of the boiler is mixed with a portion of the waste gas of the combustion product after being preheated while passing through the air supply preheating port provided in the latent heat exchanger. Air supply preheater and waste gas to prevent the environmental pollution by reducing the amount of nitrogen oxide contained in the combustion product by improving the turntown ratio during combustion of the burner, thereby reducing the temperature of the combustion products. It relates to a combustion device having a circulation structure.

A combustor such as a boiler or a water heater is a device that heats a heat medium in a closed container by a heat source to heat a desired area or supplies hot water, and heats it with heating water or direct water in a burner that burns fuel and high temperature combustion air that is combusted. It consists of a heat exchanger to deliver.

For example, the boiler of the combustion equipment, the heat exchanger of the initial boiler uses only the sensible heat generated during the combustion of the burner and the hot combustion air is discharged through the exhaust hood as it is, the thermal efficiency of the boiler is very low, It took time.

Therefore, a boiler produced in recent years has a sensible heat exchanger that absorbs the sensible heat of the combustion products generated in the combustion chamber to increase thermal efficiency, and a latent heat exchanger that absorbs the latent heat of the steam contained in the combustion products after the heat exchange in the sensible heat exchanger A boiler of this type is called a condensing boiler.

Such condensing boilers have been put into practical use not only for gas boilers but also for oil boilers, contributing to increasing boiler efficiency and reducing fuel costs.

The condensing boiler may include: a blower that sucks external air to supply air for combustion, a burner that burns a mixture of air and fuel supplied through the blower, and a sensible heat exchanger that absorbs combustion sensation generated in the burner; And a latent heat exchanger for absorbing latent heat of water vapor contained in the combustion product after the heat exchange in the sensible heat exchanger, and an exhaust hood through which the combustion product passing through the latent heat exchanger is discharged. It consists of a structure in which the outlet of the condensate water is generated by condensation of water vapor contained in the combustion product passing through.

Conventional condensing boiler has a structure that is supplied to the burner side after the outside air is introduced directly into the blower, when the temperature of the outside air supplied to the blower is low, heating the temperature of the combustion sensation generated during combustion in the burner In order to raise the temperature range required for the heating of the water, the combustion load must be increased by that amount, which causes a problem of lowering combustion efficiency and increasing fuel consumption.

In addition, the conventional combustion condensing boiler in the upstream combustion system, the exhaust direction of the combustion product and the discharge direction of the condensate water does not coincide with each other to cause mutual interference, resulting in the exhaust resistance of the combustion product and structural problems that the condensate is not discharged smoothly There was this.

Meanwhile, in the case of a gas boiler, a turn-down ratio (TDR) is generally set. The turndown ratio (TDR) refers to the ratio of the maximum gas consumption to the minimum gas consumption in a gas combustor in which the amount of gas is variably controlled. The turndown ratio is a method of reducing the minimum minimum gas consumption to maintain a stable flame. Limited depending on whether it can be adjusted.

Since the large turndown ratio means that stable combustion can be performed from the high load region to the low load region, a method of improving the turndown ratio of the burner applied to the gas boiler has been proposed in the past.

When the turndown ratio is low, the combustion speed of the mixed gas is reduced when burning in the low load region, so that a flame may be formed inside the flame plate.

In order to prevent such backfire, a method of increasing the blowing speed of the mixed gas may be proposed, but in this case, an unstable combustion in which the flame is blown off the surface is formed, which is a factor limiting the turndown ratio of the burner.

In addition, when gas is combusted, air is required, but supplying only the amount of oxygen (air amount) necessary for combustion is the most efficient, but it becomes incomplete combustion, which leads to the generation of harmful gases such as CO, and the combustion temperature is high and the exhaust gas is increased. Nitrogen oxides (NOx) increase.

Nitrogen oxides are characterized by a rapid increase when the combustion temperature is above a certain temperature, but the conventional combustion method is characterized in that the combustion temperature can not be out of this range. In addition, there is a disadvantage that the possibility of backfire increases significantly at low load combustion.

On the contrary, if the air volume is increased, harmful emissions such as CO and NOx are reduced, but the efficiency is decreased.

Therefore, in the past, the burner has a limitation in improving efficiency by designing the combustion to be performed at an appropriate amount of air due to the opposite inhibitory elements, and there is a limit in reducing harmful exhaust gas.

The present invention has been made in order to solve the above problems, after the air introduced from the outside of the boiler is preheated while passing through the latent heat exchanger is mixed with a portion of the waste gas of the combustion product to be supplied to the blower and burner side combustion load of the burner To improve the combustion efficiency and increase the blowdown rate of the mixed gas to improve the turndown ratio, which enables stable combustion of the burner and to reduce the amount of nitrogen oxide contained in the waste gas discharged through the exhaust hood. It is an object of the present invention to provide a combustion device having an air supply preheater and a waste gas circulation structure.

Another object of the present invention is to match the exhaust direction of the combustion product and the discharge direction of the condensate to reduce the exhaust resistance of the combustion product and to facilitate the discharge of the condensate from the latent heat exchanger to improve the latent heat recovery efficiency The present invention provides a combustion apparatus having an air supply preheater and a waste gas circulation structure.

Combustion apparatus having an air supply preheater and a waste gas circulation structure of the present invention for realizing the object as described above, the burner for burning the air and fuel supplied through the blower, and the sensible heat absorbing the combustion sensation generated from the burner In the combustion device comprising a heat exchanger, a latent heat exchanger for absorbing the latent heat of the water vapor contained in the combustion product heat-exchanged in the sensible heat exchanger, and an exhaust hood for exhausting the waste gas of the combustion product passing through the latent heat exchanger, The latent heat exchanger is provided with an air supply preheating port for forming an air flow path so that the air supplied from the outside of the boiler through the air supply is heat-exchanged with the combustion product to be preheated and then supplied to the burner, and passes through the air supply preheating port. And preheated air is mixed with a part of the waste gas discharged through the exhaust hood. It characterized in that through the agency that is supplied to the burner.

A waste gas connecting pipe is installed between the exhaust hood and the air supply pipe.

In addition, the waste gas connection pipe is characterized in that the waste gas inlet flow rate control device is provided.

In addition, the air supply is characterized in that the air supply amount measuring sensor for measuring the flow rate of the air flowing into the air supply by the operation of the blower.

In addition, the air supply pipe is characterized in that it is provided with a sensor for measuring the inflow amount of the mixture of air flowing through the air supply preheating port and the waste gas flowing through the waste gas connecting pipe.

The controller controls the number of revolutions of the blower based on the signal sensed by the air supply flow rate measurement sensor and controls the waste gas inflow rate control device based on the signal detected by the flow rate measurement sensor of the mixture of air and waste gas. It is characterized by including.

In addition, the combustion product burned by the burner passes through the sensible heat exchanger, flows into the latent heat exchanger, passes through the outside of the heating water heating port provided in the latent heat exchanger, and then passes through the outside of the air supply preheating outlet to exhaust the exhaust. It is discharged to the hood, and some of the waste gas discharged is characterized in that flowing into the air supply pipe.

In addition, the heating water heating port and the air supply preheating opening has a flat tube shape, and is provided with a plurality of spaced apart vertically in the front and rear of the latent heat exchanger, respectively, is disposed inclined downward toward the front and rear outer side of the latent heat exchanger, the combustion The product passes through the sensible heat exchanger and vertically ascends to the latent heat exchanger, and then descends at an acute angle with a horizontal plane to pass through the outside of the heating water heating port and the air supply preheating port, and then is discharged to the exhaust hood and the air supply pipe. .

In addition, the plurality of heat exchange fins are respectively coupled to the outside of the heating water heating port and the air supply preheating opening at predetermined intervals in the longitudinal direction.

In addition, the inner upper portion of the latent heat exchanger is characterized in that the front and rear ends are provided with an upper guide made of an inclined surface corresponding to the inclination angle of the heating water heating port and the air supply preheating opening.

In addition, the lower one side of the latent heat exchanger is provided with a condensate outlet, and in the front and rear of the latent heat exchanger in the lower side of the heating water heating port and the air supply preheating port to guide the condensate generated in the latent heat exchanger to fall to the condensate outlet side Characterized in that the lower guide is provided.

In addition, both side ends of the heating water heating port and the air supply preheating opening are respectively coupled to the left end plate and the right end plate having an insertion hole of a shape corresponding thereto, and the inside of the heating water heating port outside the left end plate and the right end plate. The flow path of the heating water flowing through the left heat cap and the right flow path cap is induced to alternately switch from left to right and right to left inside the heat exchanger, respectively.

In addition, the left channel cap, the upper flow channel cap for supplying the heating water flowed into the inlet pipe to the heating water heating ports of the front and rear sides, and the middle portion of the front and rear caps in the upper and lower sides to switch the flow path of the heating water and And a lower flow path cap configured to collect the heating water passing through the heating water heating ports on both sides of the front and rear sides, and discharge it to the outlet pipe, and the right flow path cap is provided vertically on both sides of the front and rear to discharge the flow path of the heating water. Characterized in that a set of a plurality of flow path cap to switch.

According to the combustion apparatus having the air supply preheater and the waste gas circulation structure according to the present invention, the air introduced from the outside of the boiler is preheated while passing through the air supply preheating port provided in the latent heat exchanger, and then mixed with a part of the waste gas of the combustion product to supply the air supply pipe. Since it is supplied to the burner through it can reduce the combustion load of the burner can improve the combustion efficiency.

In addition, a mixture of a part of the waste gas is supplied to the burner in addition to the air introduced through the air supply preheating port, thereby increasing the ejection speed of the mixed gas to improve the turndown ratio, thereby enabling stable combustion of the burner and lowering the combustion temperature to reduce harmful exhaust gases. There is an effect of reducing the nitrogen oxides in the.

In addition, since the combustion products generated in the burner exchange heat with the air flowing through the air supply preheating port in addition to the heating water flowing inside the heat exchange pipe of the sensible heat exchanger and the latent heat exchanger, the temperature of the exhaust gas discharged through the exhaust hood is maintained. It can be further lowered to recover the latent heat contained in the exhaust gas has the effect of increasing the efficiency.

In addition, by arranging a plurality of heating water heaters and air inlet preheating inclined downwards in the front and rear of the latent heat exchanger at upper and lower intervals to match the exhaust direction of the combustion product and the discharge direction of the condensate, the exhaust resistance of the combustion product is reduced and the condensate water is smooth. There is an effect that can be discharged.

In addition, through the simple coupling structure of the heating water heating port, the air supply preheating port, the heat exchange fins, the left and right end plates and the left and right flow path caps, the flow direction of the heating water passing through the heating water heating holes in the latent heat exchanger is alternately changed left and right. By forming the flow path as much as possible, the heat exchange efficiency can be improved.

1 is a schematic view from the left of a condensing boiler to which the present invention is applied;
Figure 2 is a longitudinal cross-sectional view seen from the left side of the condensing boiler to which the present invention is applied;
3A and 3B are perspective views of a latent heat exchanger having an air supply preheater according to the present invention;
4 is an exploded perspective view of FIG. 3A;
FIG. 5 is a longitudinal sectional view of the condensing boiler cut out on the basis of the AA line in FIG.
6 is a longitudinal cross-sectional view of the condensing boiler cut out on the basis of line BB in FIG.
7 is a block diagram illustrating a process for adjusting a mixture of air and waste gas in a combustion device having an air supply preheater and a waste gas circulation structure according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a schematic view from the left side of the condensing boiler to which the present invention is applied, Figure 2 is a longitudinal cross-sectional view of the condensing boiler to which the present invention is applied.

The condensing boiler according to the present invention is provided with an upward combustion burner 20 and a combustion chamber 30 in which flames are formed upward in the upper side of the blower 10, and combustion generated in the burner 20 above. A sensible heat exchanger (40) absorbing sensible heat, a latent heat exchanger (100) for recovering latent heat of steam contained in a combustion product (exhaust gas) that has undergone heat exchange in the sensible heat exchanger (40), and the latent heat exchanger An exhaust hood 50 through which the combustion product passing through the discharge is discharged is installed, and a condensate outlet 101 through which the condensed water generated by the latent heat exchanger 100 is discharged is disposed at a lower side of the latent heat exchanger 100. It is formed, the left side (front in FIG. 1) of the latent heat exchanger 100 is provided with an air supply port 105 through which the outside air flows.

The latent heat exchanger (100) is provided with an air supply preheater such that a mixture mixed with a part of the waste gas of the combustion product discharged to the exhaust hood (50) after the air introduced from the outside is preheated while passing through the latent heat exchanger (100). It is comprised so that it may be supplied to the burner 20 via the blower 10. FIG.

In addition, the front (right side in FIGS. 1 and 2) and the rear (left side in FIGS. 1 and 2) inside the latent heat exchanger 100 are inclined downward obliquely at an acute angle with respect to a horizontal plane toward the front and rear, respectively. Air supply preheating openings 150 and 150a are provided at vertical intervals.

The air supply preheating ports 150 and 150a have a flat tube shape, one end of which is in communication with the air supply port 105 into which air outside the boiler is introduced, and the other end of the air supply pipe 230, FIGS. 5 and FIG. 6), the preheated air is mixed with the waste gas flowing into the waste gas connecting pipe 210 installed between the exhaust hood 50 and the air supply pipe 230 while passing through the air supply preheating ports 150 and 150a. It is comprised so that it may be supplied to the blower 10 via the air supply line 230. Accordingly, as will be described later, the turndown ratio of the burner 20 may be improved to enable stable combustion and the temperature of the waste gas discharged through the exhaust hood 50 may be further lowered, thereby greatly reducing the amount of nitrogen oxides generated. Will be.

Another feature of the present invention is to reduce the exhaust resistance and the latent heat in the process of the combustion product burned in the burner 20 is discharged to the exhaust hood 50 through the sensible heat exchanger 40 and the latent heat exchanger 100 Characterized in that the exhaust direction of the combustion product and the discharge direction of the condensed water is configured to be made to smoothly discharge the condensate generated in the heat exchanger (100).

In this configuration, a plurality of heating water inclined obliquely downward while forming an acute angle with respect to a horizontal plane toward the front and the rear inside the air supply preheater 150, 150a in the front and rear of the latent heat exchanger 100, respectively. Heating ports 140 and 140a are provided at vertical intervals.

The heating water heating holes 140 and 140a have a flat tube shape, and combustion products pass between the heating water heating holes 140 and 140a disposed up and down.

In addition, an upper guide 180 having an inclined surface corresponding to the inclination angles of the heating water heating holes 140 and 140a and the air supply preheating ports 150 and 150a is provided at both inner upper portions of the latent heat exchanger 100.

In addition, the water vapor contained in the combustion product is condensed while passing through the latent heat exchanger 100 under the heating water heating ports 140 and 140a and the air supply preheating ports 150 and 150a to the inside and front and rear of the latent heat exchanger 100. The front lower guide 190 and the rear lower guide 190a guide the condensate falling to the condensate outlet 101 toward the condensate dropping to the outside of the heating water heating ports 140 and 140a and the air supply preheating ports 150 and 150a. ) Is provided.

The lower guides 190 and 190a also serve to guide combustion products rising vertically from the sensible heat exchanger 40 to the center portion of the latent heat exchanger 100.

According to the structure of the latent heat exchanger 100, the combustion product burnt by the burner 20 rises vertically toward the center of the latent heat exchanger 100 through the sensible heat exchanger 40, and vertical The combustion product moved upwards is heated by the upper guide 180 and the inclinedly arranged heating water heating ports 140 and 140a and the air supply preheating ports 150 and 150a so as to be acutely angled with the horizontal plane and downwardly descending forward and backward. The inside of the heating water and the air supply preheating ports 150 and 150a flowing through the inside of the heating water heating ports 140 and 140a are sequentially passed through the outer surfaces of the water heating ports 140 and 140a and the outer surfaces of the air supply preheating ports 150 and 150a. After the heat exchange with the air passing through, by the front and rear wall surface of the latent heat exchanger 100, the flow is again converted vertically upward and collected and then discharged to the outside through the exhaust hood (50).

Accordingly, the combustion product generated by the combustion of the burner 20 is heat-exchanged with the heating water flowing inside the sensible heat exchanger 40 and the heating water heating ports 140 and 140a installed in the latent heat exchanger 100. Since the temperature drops during the heat exchange process with the air passing through the air supply preheating ports 150 and 150a, the latent heat included in the combustion product is recovered.

In addition, the combustion direction passing between the heating water heating ports 140 and 140a and the air supply preheating ports 150 and 150a and the outside of the heating water heating ports 140 and 140a and the air supply preheating ports 150 and 150a are accumulated. Later on the surface of the heating water heating ports 140 and 140a and the air supply preheating ports 150 and 150a, the condensate flows downwardly and falls to the upper surface of the lower guides 190 and 190a to be guided to the condensate outlet 101. Since the discharge direction of the condensate coincides with each other, the condensate can be discharged smoothly without being subjected to the resistance of the combustion products.

Hereinafter, a structure in which the heating water heating ports 140 and 140a and the air supply preheating ports 150 and 150a are installed in the latent heat exchanger 100, and the flow path and the air supply of the heating water flowing through the heating water heating ports 140 and 140a are preheated. The process of adjusting the mixture of air and waste gas introduced into the combustion path and air flow path of the air supplied to the blower 10 through the spheres 150 and 150a will be described.

3a and 3b is a perspective view of a latent heat exchanger having an air supply preheater according to the present invention, Figure 3a is a perspective view from the left, Figure 3b is a perspective view from the right, Figure 4a is an exploded perspective view of Figure 3a, FIG. 5 is a longitudinal sectional view of the condensing boiler cut out based on the AA line in FIG. 3A, FIG. 6 is a longitudinal sectional view of the condensing boiler cut out based on the BB line in FIG. 3A, and FIG. Block diagram for explaining the process of adjusting the mixture of air and waste gas in the combustion device having the air supply preheater and waste gas circulation according to the.

3A to 4, the heating water heating ports 140 and 140a and the air supply preheating ports 150 and 150a which are spaced up and down spaced vertically at the front and the rear of the latent heat exchanger 100 may pass through the combustion product. The width of the side surface is formed longer than the height of the front and rear ends, and the cross section is made of a flat elliptical tube. When configured as such, the heat transfer area with the combustion product can be increased and the flow resistance of the combustion product can be reduced. It works.

In addition, a plurality of heat exchange fins 130 and 130a having a plate shape are coupled to the outside of the heating water heating ports 140 and 140a and the air supply preheating ports 150 and 150a at predetermined intervals in the longitudinal direction (left and right directions in the drawing).

That is, the heating water preheating hole insertion hole corresponding to the outer circumferential surface shape of the heating water heating holes 140; 141, 142, 143, 144, 145, 146 and the air supply preheating holes 150; 131 and a plurality of front heat exchange fins 130 having upper and lower air supply preheating hole insertion holes 132 are coupled to each other, and the heating water heating ports 140a and 141a are disposed vertically on the rear side of the latent heat exchanger 100. Outside the 142a, 143a, 144a, 145a and 146a and the air supply preheating holes 150a; 151a, 152a, 153a, 154a, 155a and 156a, the heating water preheating hole insertion holes 131a corresponding to the outer circumferential surface thereof The air supply preheating port insertion hole 132a is coupled to a plurality of rear heat exchange fins 130a formed up and down.

The left ends of the heating water heating holes 140 and 140a and the air supply preheating holes 150 and 150a are respectively formed at the left ends of the heating water heating hole insertion holes 121 and 121a and the air supply preheating hole insertion holes 122 and 122a. The right ends of the heating water heating holes 140 and 140a and the air supply preheating ports 150 and 150a are coupled to the plate 120, respectively, and the heating water heating hole insertion holes 161 and 161a and the air supply preheating hole insertion holes respectively correspond to the plates 120. 162 and 162a are coupled to the formed right end plate 160.

In addition, outside of the left end plate 120 and the right end plate 160, the flow path of the heating water flowing inside the heating water heating holes 140 and 140a alternates left and right inside the latent heat exchanger 100. The left passage cap 110 and the right passage cap 170 are coupled to each other to guide the switch.

The left flow path cap 110, the upper flow path cap 111 for separately supplying the heating water flowed into the inlet pipe (111a) to the heating water heating ports (141, 141a) provided on both sides of the front and rear, and the middle portion of the front and rear both sides And upper and lower portions of the intermediate flow path caps 112, 113, 112a, and 113a for switching the flow path of the heating water flowing inside the heating water heating ports 142, 143, 144, 145, 142a, 143a, 144a, and 145a, and heating water heating provided at the lower sides of the front and rear sides. It consists of a set of lower flow path caps 114 which collect the heat medium passing through the spheres 146 and 146a and discharge them to the outlet pipe 114a.

When the left flow path 110 is coupled to the outside of the left end plate 120, the left side of the air supply preheating holes 150 and 150a coupled to the air supply preheating hole insertion holes 122 and 122a formed in the left end plate 120. The stage communicates with the air supply port 105 through which air outside the boiler is introduced.

The right flow path cap 170 includes upper flow path caps 171 and 171a for switching flow paths of the heating water heating ports 141, 142, 141a and 142a provided at both the front and rear sides, and the heating water heating ports provided at the middle portions of the front and rear sides. Of the intermediate flow path caps 172 and 172a for switching the flow paths of (143,144,143a and 144a) and the lower flow path caps 173 and 173a for switching the flow paths of the heating water heating ports 145,146,145a and 146a provided in the lower sides of the front and rear sides. It consists of a set.

When the right channel cap 170 is coupled to the outside of the right end plate 160, the right side of the air supply preheating holes 150 and 150a coupled to the air supply preheating hole insertion holes 162 and 162a formed in the right end plate 160. The stage communicates with the air supply pipe 230 behind it.

According to this coupling structure, as shown in FIG. 5, the heating water flowing into the inlet pipe 111a formed on the upper left side of the latent heat exchanger 100 is left with the heating water heating ports 141, 142, 143, 144, 145, and 146 as indicated by arrows. After passing through the sensible heat exchanger 40 through the outlet pipe 114a formed at the lower left side of the latent heat exchanger 100 through a flow path alternately changed from right to left and right to left, and is discharged and supplied to a heating source. In addition, the heat transfer area and the time that the combustion product and the heating water contact in a limited space inside the latent heat exchanger 100 may be increased, thereby improving heat exchange efficiency.

In addition, as shown in FIG. 6, when the boiler is operated to operate the blower 10, the outside air is preheated by absorbing the latent heat of the combustion product while passing through the air supply preheating ports 151, 152, 153, 154, 155 and 156 provided inside the latent heat exchanger 100. Later, the waste gas is mixed with the waste gas introduced through the connection pipe 210 and flows into the blower 10 through the air supply pipe 230, so that combustion of the cold external air is not preheated as it is in the blower 10. The load can be reduced.

In addition, in the present invention, the heating water heating ports 140 and 140a and the air supply preheating ports 150 and 150a are installed side by side in the front and rear sides of the latent heat exchanger 100, and the front heat exchange fins 130 and the rear heat exchange fins 130a are disposed on the outside thereof. It is coupled, the left and right end plates (120, 160) and the left and right flow path caps (110, 170) are coupled to both sides, and the air supply pipe (230) is coupled to the right rear, so easy to manufacture and boiler Compact production is possible.

On the other hand, the air supply port 105 is provided with an air supply amount measuring sensor 106 for measuring the flow rate of the external air flowing in, the waste gas connecting pipe installed between the exhaust hood 50 and the air supply pipe 230 ( A waste gas inflow amount control unit 220 is provided at 210, and the air supply pipe 230 has an inflow amount of a mixture of air introduced through the air supply preheating ports 150 and 150a and waste gas introduced through the waste gas connection pipe 210. A sensor 240 is provided for measuring.

As illustrated in FIG. 7, the controller 300 controls the rotation speed of the blower 10 based on the signal for the air inflow amount measured by the air supply amount measuring sensor 106, and the air and waste gas mixture inflow amount. The control unit 300 controls the waste gas inflow control device 220 based on the signal measured by the measuring sensor 240.

By adjusting the number of revolutions of the blower 10 based on the measured value of the air supply amount measuring sensor 106, it is possible to control the amount of air flowing through the air supply port 105 and the air supply preheating ports 150 and 150a, and the air And calculating a difference value between the measured value of the inlet flow rate measurement sensor 240 and the measured value of the air supply amount measuring sensor 106, and confirms the flow rate of the inflowing waste gas, and controls the waste gas inflow control device 220. As a result, the mixing ratio of air and waste gas can be properly adjusted in consideration of the mixture gas ejection speed in the range capable of preventing backfire in the burner 20.

10: blower 20: burner
30: combustion chamber 40: sensible heat exchanger
50: exhaust hood 100: latent heat exchanger
101: condensate outlet 105: air supply
106: air supply measurement sensor 110: left side euro cap
111: upper euro cap 111a: inlet pipe
112,112a, 113,113a: Middle Euro Cap 114: Lower Euro Cap
114a: outlet pipe 120: left end plate
121,121a: Heating water heating hole insertion hole 122,122a: Air supply preheating hole insertion hole
130: front heat exchange fin 130a: rear heat exchange fin
131,131a: heating water heating hole insertion hole 132,132a: air supply preheating hole insertion hole
140,140a: Heating water heating port 150,150a: Air supply preheating opening
160: right end plate 161,161a: heating water heating hole insertion hole
162,162a: Air supply preheating hole insertion hole 170: Right side Euro cap
171,171a: Upper Euro Cap 172,172a: Middle Euro Cap
173,173a: Lower Eurocap 180: Upper Guide
190: Lower front guide 190a: Lower rear guide
210: waste gas connector 220: waste gas inlet flow control device
230: air supply pipe
240: sensor for measuring the flow rate of air and waste gas mixture
300:

Claims (13)

A burner that burns the air and fuel supplied through the blower, a sensible heat exchanger that absorbs the combustion sensible heat generated by the burner, and a latent heat exchanger that absorbs the latent heat of water vapor contained in the combustion product that has undergone heat exchange in the sensible heat exchanger. In the combustion device comprising an exhaust hood for exhausting the waste gas of the combustion product passing through the latent heat exchanger,
The latent heat exchanger, an air supply preheating port for forming an air flow path so that the air supplied from the outside of the boiler through the air supply provided on one side of the latent heat exchanger is supplied to the burner after the heat exchanged with the combustion product is preheated Is provided,
And a preheated air passing through the air supply preheating port is mixed with a part of the waste gas discharged through the exhaust hood and supplied to the burner through an air supply pipe. The method of claim 1,
A combustion device having an air supply preheater and a waste gas circulation structure, characterized in that a waste gas connection pipe is installed between the exhaust hood and the air supply pipe. The method of claim 2,
The waste gas connection pipe is provided with a waste gas inlet flow rate control device, characterized in that the air supply preheater and the combustion device having a waste gas circulation structure. The method of claim 3,
The air supply unit has an air supply preheater and a waste gas circulation structure, characterized in that the air supply amount measuring sensor for measuring the flow rate of the air flowing into the air supply by the operation of the blower. The method of claim 4, wherein
The air supply pipe is a combustor having an air supply preheater and a waste gas circulation structure, characterized in that the sensor for measuring the inflow amount of the mixture of air flowing through the air supply preheating port and the waste gas flowing through the waste gas connecting pipe. The method of claim 5,
And a control unit controlling the number of revolutions of the blower based on the signal sensed by the air supply measurement sensor and controlling the waste gas inflow rate adjusting device based on the signal detected by the inflow measurement sensor of the mixture of air and waste gas. A combustor having an air supply preheater and a waste gas circulation structure. The method of claim 1,
The combustion product burned by the burner passes through the sensible heat exchanger, flows into the latent heat exchanger, passes through the outside of the heating water heating port provided in the latent heat exchanger, and then passes through the outside of the air supply preheating outlet to exhaust the hood. And a part of the waste gas discharged into the air supply pipe is introduced into the air supply pipe. The method of claim 7, wherein
The heating water heating port and the air supply preheating port have a flat tube shape, and are provided in plurality in the front and rear of the latent heat exchanger, respectively, at a vertical interval, and are inclined downward toward the outside of the front and rear of the latent heat exchanger, and the combustion product. After passing through the sensible heat exchanger vertically ascending to the latent heat exchanger, and descending at an angle while forming an acute angle with a horizontal plane after passing through the outside of the heating water heating port and the air supply preheating outlet is discharged to the exhaust hood and the air supply pipe Combustor with preheater and waste gas circulation structure. The method of claim 7, wherein
And an air supply preheater and a waste gas circulation structure, wherein a plurality of heat exchange fins are coupled to the outside of the heating water heating port and the air supply preheating port at predetermined intervals in a longitudinal direction. The method of claim 7, wherein
The inner side of the latent heat exchanger is provided with an air supply preheater and a waste gas circulation structure, characterized in that the front and rear ends are provided with an upper guide made of an inclined surface corresponding to the inclination angle of the heating water heating port and the air supply preheating opening. The method of claim 7, wherein
The lower one side of the latent heat exchanger is provided with a condensate outlet,
An air supply preheater and a waste gas circulating structure are provided at lower sides of the heating water heating port and the air supply preheating port in the front and rear sides of the latent heat exchanger, and a lower guide is provided to guide condensate generated in the latent heat exchanger to the condensate outlet. Combustion apparatus provided with. 12. The method according to any one of claims 7 to 11,
Both side ends of the heating water heating port and the air supply preheating opening are respectively coupled to the left end plate and the right end plate, each having an insertion hole having a shape corresponding thereto, and the inside of the heating water heating port is formed outside the left end plate and the right end plate. The air supply preheater and the waste gas circulation structure are combined with the left flow channel cap and the right flow channel cap, respectively, which induce the flow of the flowing heating water to be alternately switched from left to right and right to left in the latent heat exchanger. Combustion apparatus provided with. The method of claim 12,
The left flow path cap has an upper flow path cap for dividing and supplying the heating water introduced into the inlet pipe into the heating water heating ports on both the front and rear sides, and an intermediate flow path cap which is provided up and down on the front and rear sides to switch the flow path of the heating water, It consists of a set of lower flow path caps for collecting the heating water passing through the heating water heating ports of the front and rear sides and discharged to the outlet pipe,
The right flow channel cap is provided with up and down on both sides of the front and rear combustion apparatus having an air supply preheater and a waste gas circulation structure, characterized in that composed of a plurality of flow channel cap for switching the flow path of the heating water.

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