KR100937107B1 - Gas preheating apparatus - Google Patents

Abstract

PURPOSE: A gas preheating apparatus is provided to minimize leakage of incoming gas and efficiency degradation of heat recovery with a gas sealing between an interface of an exhaust part and an inlet and a rotation rotor. CONSTITUTION: A gas preheating apparatus comprises a rotation rotor(126), a discharging unit(122), an inlet(123), and a gas sealing generator(200). An exhaust gas and an incoming gas pass through the rotation rotor to transfer heat. The discharging unit supplies the exhaust gas supplied from a heat supply source to the rotation rotor. The inlet supplies the incoming gas passing through the rotation rotor to the heat supply source. The gas sealing generator is supplied to the interface between the end part of the discharging unit which is adjacent to the rotation rotor and the inlet. A gas sealing which restricts gas flow between the inlet and the outlet is formed at the region adjacent to the rotation rotor.

Description

GAS PREHEATING APPARATUS}

The present invention relates to a gas preheating device, and more particularly, to a gas preheating device capable of preheating an inlet gas required for operation of a heat supply source using waste heat from a heat supply source.

Recently, various measures have been proposed to improve energy efficiency of heat sources and minimize environmental pollution due to concerns about environmental pollution and energy depletion.

As one of the measures to improve energy efficiency, the air preheating device has been proposed to preheat the inlet gas required to operate the boiler by using the waste heat of the exhaust gas discharged from the cogeneration boiler.

1 is a view showing the structure of a conventional air preheater. As shown in FIG. 1, the conventional air preheater 20 is configured to perform heat exchange between the exhaust gas and the inlet gas through a rotating rotor 24 made of a heat exchange element.

That is, the internal space of the conventional air preheater 20 is divided into upper and lower spaces by the separating plate 22, and the rotary rotor 24 is disposed adjacent to the separating plate 22 to rotate at a predetermined speed. Done. At the same time as the rotary rotor 24 rotates, the exhaust gas discharged from the boiler 10 may be discharged through the upper region of the rotary rotor 24 along the upper space of the separator plate 22, and the inlet gas may rotate. Passing through the lower region of the rotor 24 may be supplied to the boiler 10 along the lower space of the separator plate 22. Accordingly, the rotary rotor can be heated by waste heat of the exhaust gas while the exhaust gas passes through the rotary rotor 24, and the inlet gas is preheated by the heated rotary rotor while the inlet gas passes through the rotary rotor 24. Can be.

However, in the related art, some of the inflow gas to be introduced into the boiler 10 through the rotary rotor 24 leaks into the exhaust path of the exhaust gas, and thus the heat recovery efficiency is lowered and the energy consumption efficiency is lowered. There is a problem.

That is, in the conventional air preheating device, in order to ensure smooth rotation of the rotary rotor 24, a predetermined gap should be formed between the rotary rotor 24 and the separation plate 22, and the separation plate 22 and the rotation rotor ( 24) there is a problem that some of the inlet gas is leaked to the exhaust path of the exhaust gas through the gap between, the heat recovery efficiency is lowered by the leakage of the inlet gas and the energy consumption efficiency of the fuel is lowered. Furthermore, when some of the inflow gas leaks into the exhaust path of the exhaust gas, there is a fear that a fire may occur as the dust and the like contained in the exhaust gas are rubbed.

The present invention provides a gas preheating device that can improve heat recovery efficiency and energy consumption efficiency.

In particular, the present invention provides a gas preheating device that can minimize the leakage of the inlet gas to improve the heat recovery efficiency and energy consumption efficiency.

In addition, the present invention provides a gas preheating apparatus that can simplify the structure, reduce the construction cost of the installation, and reduce the maintenance cost.

According to a preferred embodiment of the present invention for achieving the above object of the present invention, the gas preheater for preheating the inlet gas using the exhaust gas exhausted from the heat source, the exhaust gas and the inlet gas passing through the heat exchange A rotor, an exhaust portion for supplying exhaust gas provided from the heat source to the rotary rotor, an inlet portion for supplying inlet gas passing through the rotary rotor to the heat source, and an end boundary of the exhaust portion adjacent to the rotary rotor and an end portion of the inlet portion; And a gas sealing generator for forming a gas sealing for restricting gas movement between the inlet and the exhaust port in the region adjacent to the rotary rotor.

For reference, in the present invention, the heat source may include a cogeneration boiler, as well as other conventional heat sources driven by receiving inflow gas such as an engine, and the like and characteristics of the heat source. It is not intended to be exhaustive or to limit the invention.

The exhaust part and the inlet part may be provided in the form of ducts or flow paths that are independent of each other, and in some cases, may be provided by dividing an internal space of one duct (or flow path). For example, the exhaust part and the inlet part may be provided by partitioning an internal space of one flow path (or duct). That is, a separation plate may be provided inside one flow path, and an inner space of the flow path may be divided into an exhaust part and an inlet part based on the separation plate.

The rotary rotor is provided for mutual heat exchange between the exhaust gas and the inlet gas, and the structure of the rotary rotor may be variously changed according to the required conditions and design specifications. For example, the rotary rotor may include a rotor body formed of a heat exchange element capable of exchanging heat with the exhaust gas and the inflow gas, and a sealing member radially formed on the inner surface of the rotor body to be adjacent to an end of the exhaust part and the inlet part.

Meanwhile, in order to smoothly rotate the rotary rotor, a predetermined gap must be secured between the rotary rotor and the separator plate, and some of the inlet gas to be introduced into the boiler through the rotary rotor is discharged through the gap. May leak. However, in the present invention, a gas sealing is formed between the rotary rotor and the separator plate through the gas sealing generator to prevent inflow gas leakage between the rotary rotor and the separator plate. That is, the gas sealing generator may form a gas seal using a forced flow of gas, and this gas sealing may be implemented by forcibly blowing a gas, and in some cases, forcibly inhaling the gas ( suction) to implement gas sealing.

The structure of the gas sealing generator for forcibly blowing the gas to form a gas seal may be variously changed according to required conditions and design specifications. For example, the gas sealing generating unit may include a nozzle body provided adjacent to an end of the separator plate, and a nozzle injection unit formed on the nozzle body to inject gas for forming gas sealing toward the rotating rotor. As the nozzle injection unit, a plurality of nozzle holes or nozzle tips which are spaced apart from each other at predetermined intervals may be used. In some cases, an injection slit in which the nozzle injection unit flat jets gas. It may be configured as. Alternatively, the gas sealing generating unit may be configured to include a nozzle chamber formed in the interior of the separator plate, and a nozzle injection port formed in communication with the nozzle chamber to inject gas for forming the gas sealing toward the rotating rotor, the rotating rotor Gas sealing formed between and the separation plate may be made of a double or more gas sealing structure.

Meanwhile, a bypass line may be provided to bypass some of the exhaust gas passing through the rotary rotor to the gas sealing generator, and the gas sealing generator forms the gas sealing using the exhaust gas bypassed through the bypass line. can do. In some cases, the gas sealing generator may be configured to form the gas sealing by the gas supplied from a separate gas supply means other than the exhaust gas. In addition, the gas sealing generating unit may be provided with a blowing unit for providing a predetermined or more blowing force, the gas injected from the gas sealing generating unit by the blowing unit is a pressure greater than the supply pressure of the supply gas passing through the rotary rotor It can be injected into.

According to the gas preheating apparatus according to the present invention, the heat recovery efficiency can be improved and the energy consumption efficiency can be improved.

In particular, according to the present invention by forming a gas seal between the end boundary of the exhaust and the inlet and the rotary rotor, it is possible to minimize the leakage of the inlet gas, it is possible to minimize the reduction of heat recovery efficiency due to the leakage of the inlet gas. As such, since the preheating efficiency of the inlet gas can be maximized, the energy consumption efficiency can be improved, and the driving efficiency of the boiler can be improved.

In addition, according to the present invention, since the gas seal for preventing the leakage of the inlet gas can be formed by bypassing some of the exhaust gas discharged to the outside, the structure can be simplified, and the construction cost of the equipment can be reduced, Maintenance cost can be reduced.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the embodiments. In describing the present invention, a detailed description of known functions or configurations may be omitted to clarify the gist of the present invention.

Figure 2 is a block diagram showing a boiler system for cogeneration with a gas preheater according to the present invention, Figure 3 is a perspective view showing the structure of the gas preheater according to the present invention, Figure 4 is a gas according to the present invention It is sectional drawing which shows the structure of a preheating apparatus. 5 and 6 are views showing the structure of the sealing unit as a gas preheating apparatus according to the present invention.

As shown in Figures 2 to 4, the gas preheater 120 according to an embodiment of the present invention uses the waste heat of the exhaust gas discharged from the boiler 110 to the inlet gas required to operate the boiler 110. It may be provided for preheating, and includes a rotary rotor 126, an exhaust 122, an inlet 123, and a gas sealing generator 200.

The exhaust part 122 and the inlet part 123 may be understood as a flow path through which exhaust gas discharged from the boiler 110 and a supply gas for supplying the boiler 110 flow, such an exhaust part and an inlet part It may be provided in the form of a duct or a flow path independent from each other, and in some cases may be provided by dividing the internal space of one duct (or flow path). Hereinafter, the exhaust part 122 and the inlet part 123 will be described with reference to an example provided by dividing an internal space of one flow path 121.

The shape and structure of the flow passage 121 may be variously changed according to the required conditions and design specifications. For example, the flow passage 121 may be formed to have a substantially hollow cylindrical shape, and both ends of the flow passage 121 may include an exhaust gas duct 132 for exhaust gas and an inflow gas duct for supplying the inflow gas. 134 may be connected respectively. In addition, the exhaust gas duct 132 may be provided with a filter means for filtering the exhaust gas and various additional devices (not shown), the present invention is not limited or limited by the type and structure of the additional device. .

The separation plate 124 is formed to divide the internal space of the flow path 121 into two flow paths. That is, the inner space of the flow path 121 may be divided into the exhaust part 122 and the inlet part 123 by the separation plate 124. Hereinafter, the separation plate 124 may be formed inside the flow path 121. It will be described with an example in which the upper space of the separator plate 124 is defined as the exhaust part 122 and the lower space of the separator plate 124 is defined as the inlet part 123. In some cases, the separator may be disposed at an incline at a vertical or other angle.

The rotary rotor 126 is provided at least one rotatably inside the flow passage 121 to be adjacent to the end of the separation plate 124, so that the exhaust gas and the inlet gas can pass through and heat exchange. That is, at the same time as the rotary rotor 126 rotates, the exhaust gas discharged from the boiler 110 may be discharged through the upper region of the rotary rotor 126 along the exhaust portion 122, and the inflow gas may be discharged. The rotary rotor 126 is a waste heat of the exhaust gas while the hot exhaust gas passes through the rotary rotor 126 through the lower region of 126 and may be supplied to the boiler 110 along the supply unit 123. It can be heated by, and the inlet gas can be preheated by the heated rotor 126 while the low temperature inlet gas passes through the rotating rotor 126. The rotation speed of the rotary rotor 126 may be appropriately changed according to the required conditions and design specifications.

As described above, the rotary rotor 126 is provided for mutual heat exchange between the exhaust gas and the inflow gas. Hereinafter, the rotary rotor 126 is a circular rotor including a heat exchange element 127a capable of heat exchange with the exhaust gas and the inflow gas. A main body 127 and a sealing member 128 formed radially on an inner surface of the rotor body 127 facing the separator plate 124 and disposed between the rotor body 127 and the separator plate 124. For example, the configuration will be described.

The rotor body 127 may be provided to have an approximately disk shape by assembling a conventional heat exchange element 127a in a stacked or bundle form so that exhaust gas and inflow gas can pass therethrough, and the exhaust gas and inflow gas are heat exchange elements. Heat may be exchanged with the heat exchange element 127a while passing between the 127a.

On the other hand, in order to ensure the smooth rotation of the rotary rotor 126, that is, in order to rotate the rotary rotor 126 in the absence of interference and friction between the separation plate 124 and the rotary rotor 126 and the rotor body 127 and A predetermined gap G should be formed between the separator plates 124. The gap plate 124 may face the separator plate 124 to reduce the gap between the rotor body 127 and the separator plate 124. The inner surface of the rotor body 127 may be provided with a plurality of sealing members 128 radially. The number and placement angle of the sealing member 128 may be appropriately changed according to the rotation speed and diameter of the rotary rotor 126, and together with the sealing member 128, the outer circumferential surface of the rotor body 127 and the flow path 121 An outer circumferential sealing member (not shown) may be used to seal the gap therebetween.

The gas sealing generator 200 is provided at an end boundary of the exhaust part 122 adjacent to the rotary rotor 126 and an end portion of the inlet part 123 to exhaust the exhaust part 122 in an area adjacent to the rotary rotor 126. And gas sealing to limit gas movement between inlets 123.

That is, the gas sealing generator 200 may form the gas sealing by using a forced flow of gas, such gas sealing may be implemented by forcibly blowing a gas, in some cases The gas sealing may be implemented by forcibly drawing gas. Hereinafter, an example in which gas sealing is implemented by forced blowing of gas will be described.

The gas sealing generator 200 is a rotary rotor 126 and the separator 124 in order to prevent the inflow gas passing through the rotary rotor 126 is leaked between the rotary rotor 126 and the separator 124. In order to form a gas sealing by forced blowing of gas in between.

That is, even though the sealing member 128 is provided between the rotor body 127 and the separator plate 124, a predetermined gap is inevitably formed between the rotor body 127 and the separator plate 124. Since the inflow gas supplied along the inlet 123 flows at a relatively high wind pressure compared to the exhaust gas discharged along the 122, the rotary rotor through the gap between the rotor body 127 and the separator plate 124. Some of the inflow gas to be introduced into the boiler 110 through the passage 126 may leak into the discharge path (exhaust portion) of the exhaust gas, and the gas sealing generator 200 may include the rotary rotor 126. A gas seal may be formed between the separators 124 to minimize leakage of the inlet gas. Herein, the gas sealing by forced blowing of gas may be understood as a sealing film formed by spraying gas in a kind of air curtain method.

The structure of the gas sealing generator 200 for forming the gas sealing may be variously changed according to required conditions and design specifications.

For example, as shown in FIG. 5, the gas sealing generator 200 is formed on the nozzle body 210 and the nozzle body 210 provided adjacent to the end of the separating plate 124 and the rotary rotor ( 126) may be configured to include a nozzle injection unit for injecting a gas for forming a gas sealing. The nozzle body 210 may be integrally mounted on the separator plate 124 through a conventional welding or fastening method, and the gas supplied to the nozzle body 210 may be injected through the nozzle injection unit to form a gas seal. can do. The nozzle injection unit may be composed of a plurality of nozzle holes 220 or a nozzle tip spaced apart from each other at predetermined intervals, hereinafter, the nozzle injection unit may include a plurality of nozzle holes 220. An example of the configuration will be described. In addition, the number and arrangement interval of the nozzle holes 220 may be appropriately changed according to the diameter and design conditions of the rotary rotor 126, the nozzle injection unit as close as possible to the rotary rotor 126 to maximize gas sealing efficiency. It is preferable that the arrangement.

In the above-described embodiment, a plurality of nozzle holes (or nozzle tips) are applied as the nozzle sprayer. However, in some cases, as illustrated in FIG. 6, a spray slit in which the nozzle sprayer flat jets gas. 220 '. That is, the injection slit 220 'may be formed in a straight section having a uniform width as a whole, and the gas injected through the injection slit 220' is uniformly sprayed over the entire section of the injection slit 220 '. And a plane spray to have a flow rate to form a gas seal. As such, the gas sealing formed through the injection slit 220 'may maintain the injection speed and the flow rate uniformly over the entire section, thereby maximizing the sealing efficiency due to the gas sealing.

Meanwhile, a bypass line for bypassing a part of the exhaust gas passing through the rotary rotor 126 to the gas sealing generator 200 in the exhaust gas duct 132 connected to the flow passage 121 to discharge the exhaust gas. 136 may be provided, and the gas sealing generator 200 may form a gas sealing using exhaust gas bypassed through the bypass line 136. Of course, in some cases, the gas seal generating unit may be configured to form a gas seal by a gas supplied from a separate gas supply means other than the exhaust gas, but external to reduce the structure and construction costs and reduce the maintenance cost. It is preferable to form a gas seal by using the exhaust gas discharged to.

In addition, the gas sealing generator 200 may be provided with a blower 137 for providing a predetermined blow force or more, the gas injected from the gas sealing generator 200 by the blower 137 is It may be injected at a pressure greater than the supply pressure of the feed gas passing through the rotary rotor 126. As the blower 137, a conventional blower may be used, and the capacity of the blower may be appropriately changed in consideration of the supply speed of the inlet gas and the leak rate of the inlet gas leaked into the gap.

On the other hand, Figure 7 is a view showing the structure of a gas preheater according to another embodiment of the present invention. In addition, the same or equivalent reference numerals are given to the same or equivalent components as those described above, and detailed description thereof will be omitted.

As shown in FIG. 7, the gas preheater according to another embodiment of the present invention includes a flow path 121 connected to the boiler 110, and an exhaust part 122 and an inlet part of the internal space of the flow path 121. Separating plate 124 partitioned by 123, the rotary rotor 126 is provided rotatably adjacent to the end of the separating plate 124, the exhaust gas and the inlet gas passes through and heat exchange, and the rotary rotor 126 Gas sealing is generated to form a gas sealing between the rotary rotor 126 and the separator 124 in order to prevent the inflow gas passing through the leakage between the rotary rotor 126 and the separator 124. Including a portion 300, the gas sealing generating portion 300 is formed in communication with the nozzle chamber 310, and the nozzle chamber 310 formed inside the separation plate 124, the rotary rotor 126 It may include a nozzle injection port 320 for injecting a gas for forming a gas sealing to the side.

That is, the nozzle chamber 310 and the nozzle injection port 320 may be integrally manufactured and provided when the separation plate 124 is initially manufactured. The nozzle chamber 310 may be formed through the inside of the separation plate 124 adjacent to the end of the separation plate 124, the nozzle injection port 320 may be formed through the side end of the separation plate 124. . Therefore, the gas introduced into the nozzle chamber 310 is injected through the nozzle injection port 320 and may form a gas seal between the rotary rotor 126 and the separator 124.

In addition, as in the above-described embodiment, some of the exhaust gas passing through the rotary rotor 126 through the bypass line (see 136 of FIG. 2) may be bypassed to the gas sealing generator 300. The generator 300 may form a gas seal using the exhaust gas bypassed through the bypass line (see 136 of FIG. 2).

In addition, by allowing the gas sealing formed between the rotary rotor 126 and the separator 124 to have a gas sealing structure of two or more, it is possible to implement a more stable sealing effect. That is, together with the gas sealing generator 300 formed of the nozzle chamber 310 and the nozzle injection port 320, another gas sealing generator 200 including the nozzle body 210 and the nozzle injection unit 220 may be applied together. The first gas seal may be formed by the gas sealing generator 300 formed of the nozzle chamber 310 and the nozzle injection hole 320, and the nozzle body 210 and the nozzle injection part 220. Secondary gas sealing may be formed by the other gas sealing generator 200. In some cases, three or more gas seals may be formed, and the present invention is not limited or limited by the number of gas seals.

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

1 is a view showing the structure of a conventional air preheater.

Figure 2 is a block diagram showing a boiler system for cogeneration with a gas preheater according to the present invention.

3 is a perspective view showing the structure of the gas preheater according to the present invention.

4 is a cross-sectional view showing the structure of the gas preheater according to the present invention.

5 and 6 are views showing the structure of the sealing unit as a gas preheating apparatus according to the present invention.

7 is a view showing the structure of a gas preheater according to another embodiment of the present invention.

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

110: boiler 120: air preheating device

122: euro chamber 124: separator

126: rotary rotor 127: rotor body

128: sealing member 200: gas sealing generating unit

Claims (10)

In the gas preheater for preheating the inlet gas by using the exhaust gas exhausted from the heat source, A rotary rotor through which the exhaust gas and the inlet gas pass and heat exchange; An exhaust unit for supplying exhaust gas provided from the heat supply source to the rotary rotor; An inlet for supplying the inflow gas passing through the rotary rotor to the heat supply source; And A gas seal is provided at an end boundary of the exhaust portion adjacent to the rotary rotor and an end portion of the inlet portion, and forms a gas sealing that restricts gas movement between the inlet portion and the exhaust port in an area adjacent to the rotary rotor; part; Gas preheating device comprising a. The method of claim 1, The gas sealing generator is a gas preheater, characterized in that for forming the gas sealing using a forced flow of gas. The method of claim 1, A blower connected to the gas sealing generator to provide a blowing force; And a gas injected from the gas sealing generator is injected at a pressure greater than a supply pressure of a supply gas passing through the rotary rotor. The method of claim 3, It further includes a bypass line for bypassing a portion of the exhaust gas passing through the rotary rotor to the gas sealing generating unit, And a gas sealing generator to form the gas sealing by injecting the bypassed exhaust gas. The method of claim 1, A separator provided at a boundary of the exhaust part and the inlet part, The gas sealing generator is provided on the separator plate. The method of claim 5, The gas sealing generation unit, A nozzle body provided adjacent to an end of the separation plate; And And a nozzle injection unit formed in the nozzle body to inject a gas for forming the gas sealing toward the rotary rotor side. The method of claim 6, The nozzle injection unit comprises a plurality of nozzle holes or nozzle tips are formed spaced apart at a predetermined interval. The method of claim 6, And the nozzle injection unit comprises a jet slit for flat jet of the gas. The method according to claim 5 or 6, The gas sealing generation unit, A nozzle chamber formed inside the separation plate; And And a nozzle injection port formed in communication with the nozzle chamber and injecting a gas for forming the gas seal toward the rotary rotor side. The method of claim 1, The rotary rotor, And a sealing member radially formed on an inner surface thereof so as to be adjacent to an end of the exhaust part and the inlet part.

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