Air-fuel dual regenerative tank and air-fuel dual regenerative alternating switching combustion device

Abstract

This invention relates to an air-gas dual regenerative heat storage box and an alternating air-gas dual regenerative combustion device. The air-gas dual regenerative heat storage box includes a first chamber for storing the heat storage material and a second chamber for circulating the combustible gas, separated by a partition. When the heat storage material is, for example, a heat storage ball, and the combustible gas is, for example, coal gas, the possibility of tar in the coal gas caking between the heat storage ball and the ball due to the shape limitation of the ball can be reduced. Furthermore, this heat storage box has a simple structure, is easy to use, and provides good heating performance.

Description

Technical Field

[0001] This invention relates to the field of thermal equipment technology, and particularly to an air-gas dual heat storage box, and also to an alternating air-gas dual heat storage combustion device including the above-mentioned air-gas dual heat storage box. Background Technology

[0002] Industrial furnaces can be used to smelt various workpieces (such as aluminum products and copper products), and are key equipment in high-temperature industries. When using industrial furnaces, an air-fuel dual regenerator is usually used to heat the combustible gas entering the furnace.

[0003] Currently, a typical air-gas dual-heat storage box structure involves stacking multiple layers of heat storage elements sequentially within the box body, with gaps between adjacent elements. Combustible gas flows through these gaps, being heated by the heat storage elements during its flow. However, the heat storage elements currently used are typically heat storage balls. When the combustible gas is, for example, coal gas, the moist tar in the gas often causes the heat storage balls to clump together and become blocked. This severely affects the performance of the gas-fired heat storage box.

[0004] Therefore, how to solve the problem of easy blockage in gas-fired thermal storage tanks is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] This invention provides an air-gas dual heat storage box, which separates the heat storage body and the combustible gas by a separator, thereby reducing the possibility of the air-gas dual heat storage box being blocked.

[0006] The air-gas dual heat storage box of the present invention includes a first cavity for storing heat storage materials and a second cavity for circulating combustible gas, which are divided by a partition.

[0007] In one embodiment, during smoke exhaust, the first cavity is configured to allow flue gas to flow through it, and the flue gas exchanges heat with the heat storage body and the separator; during combustion, the first cavity is configured to allow combustion-supporting gas to flow through it, the second cavity allows combustible gas to flow through it, and the heat storage body and the separator, heated by the flue gas, exchange heat with the combustible gas and the combustion-supporting gas.

[0008] In one embodiment, the separator is placed inside the heat storage body.

[0009] In one embodiment, the separator includes a peripheral wall forming a sealed cavity and a plurality of hollow members disposed in the sealed cavity, wherein the sealed space enclosed by the sealed cavity and the hollow members is the second cavity, and the parts outside the second cavity are all the first cavity.

[0010] In one embodiment, the cavity of the hollow component is connected to the cavity of the air-fuel dual heat storage box.

[0011] In one embodiment, the heat storage body is disposed between the lower part of the separator and the body of the air-gas dual heat storage box, wherein the separator is placed above the heat storage body.

[0012] In one embodiment, the heat storage body is provided between the side of the separator and the body of the air-gas dual heat storage box.

[0013] In one embodiment, a gap is provided between the upper part of the partition and the body of the air-fuel dual heat storage box, and an opening is provided on the body wall above the partition to allow the cavity of the body to communicate with the outside.

[0014] The alternating air-gas dual regenerative combustion device of the present invention includes a furnace, at least three burners connected to the furnace, an air-gas dual regenerative chamber connected to each of the burners, and a controller for controlling the burners. The air-gas dual regenerative chamber is any one of the air-gas dual regenerative chambers described above. The controller switches the burners to alternately be used for combustion or for exhaust. The alternating air-gas dual regenerative combustion device is configured such that at any given time, the number of burners used for exhaust is greater than the number of burners used for combustion.

[0015] In one embodiment, all the flue gas in the furnace is discharged through an air-fuel dual regenerator for flue gas exhaust.

[0016] Compared to existing technologies, the heat storage body and the combustible gas flowing through the air-gas dual heat storage box of the present invention are separately arranged. Therefore, when the heat storage body is, for example, a heat storage ball and the combustible gas is, for example, natural gas, the possibility of tar in the natural gas caking with the heat storage ball due to the shape limitation of the heat storage ball can be reduced. Moreover, the air-gas dual heat storage box has a simple structure, is easy to use, and has a good heating effect. Attached Figure Description

[0017] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of a structure of an air-gas dual heat storage box according to an embodiment of the present invention;

[0019] Figure 2 This is another structural schematic diagram of the air-gas dual heat storage box according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the regenerative combustion system of the present invention.

[0021] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] like Figure 1 As shown (arrows indicate the flow direction of combustible gas), the air-gas dual heat storage box 1 of the present invention includes a first cavity 11a and a second cavity 11b separated by a partition 12. The first cavity 11a is used to house a heat storage element 13. When the air-gas dual heat storage box 1 is used for combustion, the second cavity 11b is used to introduce combustible gas. As the combustible gas flows through the second cavity 11b, it is heated by the partition 12 and the heat storage element 13 located in the first cavity 11a. Furthermore, during combustion, the first cavity 11a is configured to allow combustion-supporting gas (such as air) to flow through the gaps in the heat storage element 13, thereby heating the combustion-supporting gas.

[0024] Because the heat storage body 13 and the combustible gas are separately arranged, when the heat storage body 13 is, for example, a heat storage ball and the combustible gas is, for example, coal gas, the possibility of moisture tar in the coal gas caking between the heat storage ball and the heat storage ball due to the shape limitation of the heat storage ball can be reduced. Furthermore, since the separator 12 can be used only to separate the heat storage body 13 and the combustible gas, each wall of the separator 12 can be arranged in a straight line. This reduces the resistance of the separator 12 to the combustible gas, thereby reducing the possibility of impurities in the combustible gas adhering to the separator 12. Even if adhesion occurs, it is easy to clean, further reducing the possibility of blockage in the air-gas dual heat storage box 1.

[0025] During exhaust, the flue gas flows through the first cavity 11a and exchanges heat with the heat storage body 13 and the partition 12. During combustion, the combustible gas and the combustion-supporting gas are heated by the heat storage body 13 and the partition 12 so that the heat in the flue gas can be effectively recovered and utilized.

[0026] In one embodiment, such as Figure 2 As shown, the separator 12 includes a peripheral wall forming a sealed cavity and multiple hollow members 121 disposed within the separator 12 and fixed at both ends to the peripheral wall. Each hollow member 121 is an open structure, and its inner hole is separated from the sealed cavity of the separator 12. A heat storage element 13 is provided in each hollow member 121. The sealed space formed by the sealed cavity and the hollow members 121 is the second cavity 11b, and the portion outside the second cavity 11b is the first cavity 11a. This design is simple, convenient to use, and provides good heating effect. Furthermore, when a combustible gas is introduced, it is easily heated by the heat storage element 13, thereby improving the heating effect of the combustible gas.

[0027] The inlet and outlet of the second cavity 11b can both be located on the side wall of the partition 12 to facilitate the arrangement of pipelines for the flow of combustible gas. All parts of the partition 12 can be made of metal to improve heat transfer. The peripheral, top, and bottom walls of the hollow member 121 and the partition 12 are all straight to reduce the possibility of impurities in the combustible gas adhering to the partition 12.

[0028] Preferably, such as Figure 1 and Figure 2 As shown, the hollow component 121 is arranged axially or radially along the housing 101 of the air-fuel dual heat storage tank 1, and multiple layers of heat storage bodies 13 are stacked sequentially along the extending direction of the hollow component 121. When the extending direction of the hollow component 121 is along the axial direction of the housing 101, the combustible gas also moves axially along the housing 101. When the extending direction of the hollow component 121 is along the radial direction of the housing 101, the combustible gas also moves radially along the housing 101. This extends the heating time of the combustible gas, thereby making the heating of the combustible gas more complete.

[0029] Furthermore, the partition 12 is embedded in the heat storage body 13 to simplify the structure and facilitate installation, and is heated by the heat storage body 13 located below the partition 12. In one example, the gap between the partition 12 and the housing 101 above and / or below and / or around the partition 12 can be provided with heat storage bodies 13 to further improve the heating effect on the partition 12. The second cavity 11b is located in the middle of the first cavity 11a. In addition, there is a gap between the partition 12 and the housing 101 above it, and a flue gas inlet is provided on the housing wall above the partition 12. Since the temperature of the air-gas dual heat storage box 1 is relatively high (500-900℃) near the part where the flue gas first flows, the temperature in the second cavity 11b can be relatively high (200-800℃) when it is set up in the above manner. In this way, impurities in the combustible gas will be carbonized into powder due to high temperature, and can enter the furnace connected to the air-gas dual heat storage box 1 (e.g., Figure 2 (As shown) it burns inside.

[0030] like Figure 3As shown (solid arrows indicate the flow direction of combustible gas and combustion-supporting gas, hollow arrows indicate the flow direction of flue gas), the alternating air-gas dual regenerative combustion device of the present invention includes a furnace 2, at least three burners (not shown in the figure) connected to the furnace 2, an air-gas dual regenerative heat storage box 1 connected to the burners, and a controller (not shown in the figure) for controlling the burners. The air-gas dual regenerative heat storage box 1 is the same as described above. The controller switches the burners to alternately use them for combustion or for flue gas exhaust, and at any given time, the number of burners used for flue gas exhaust is greater than the number used for combustion. This alternating air-gas dual regenerative combustion device can reduce the possibility of impurities in the combustible gas adhering to the heat storage body 13 and can effectively reduce the possibility of blockage in the air-gas dual regenerative heat storage box 1. It also facilitates the exhaust of flue gas from the furnace. When the flue gas is exhausted, it all passes through the air-gas dual regenerative heat storage box used for exhaust, so that the waste heat in the flue gas can be effectively recovered.

[0031] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A dual air-fuel heat storage tank, comprising a first cavity for stacking heat storage bodies and a second cavity for flowing combustible gas, separated by a partition; the partition comprises a peripheral wall forming a sealed cavity, and a plurality of hollow members arranged in the sealed cavity, both ends of the hollow members being fixed on the peripheral wall, the plurality of hollow members are all open structures, and the inner holes of the hollow members are separated from the sealed cavity of the partition; wherein, The sealed space enclosed by the sealed cavity and the hollow component is the second cavity, and all parts outside the second cavity are the first cavity.

2. The dual air and fuel heat storage tank of claim 1, wherein, During smoke exhaust, the first cavity is configured to allow the flue gas to flow through it, and the flue gas exchanges heat with the heat storage body and the partition. During combustion, the first cavity is configured to circulate combustion-supporting gas, the second cavity circulates combustible gas, and the heat storage body and the separator, heated by the flue gas, exchange heat with the combustible gas and the combustion-supporting gas.

3. The dual air and fuel heat storage tank according to claim 1 or 2, characterized in that, The separator is placed inside the heat storage body.

4. The air-gas dual heat storage box according to claim 1, characterized in that, The cavity of the hollow component is connected to the cavity of the air-fuel dual heat storage box.

5. The air-fuel dual heat storage box according to claim 1 or 2, characterized in that, The heat storage body is disposed between the lower part of the separator and the body of the air-gas dual heat storage box, wherein the separator is placed above the heat storage body.

6. The air-gas dual heat storage box according to claim 1 or 2, characterized in that, The heat storage body is located between the side of the separator and the body of the air-gas dual heat storage box.

7. The air-gas dual heat storage box according to claim 1 or 2, characterized in that, A gap is provided between the upper part of the partition and the body of the air-gas dual heat storage box, and a flue gas inlet is provided on the body wall above the partition.

8. An alternating air-gas dual regenerative combustion device, comprising a furnace, at least three burners connected to the furnace, an air-gas dual regenerative chamber connected to each of the burners, and a controller for controlling the burners, wherein, The air-gas dual heat storage box is the air-gas dual heat storage box according to any one of claims 1-7, the controller switches the burners to alternately use for combustion or for exhaust, and the alternating air-gas dual heat storage combustion device is configured such that at any given time the number of burners used for exhaust is greater than the number of burners used for combustion.

9. The alternating air-gas dual regenerative combustion device according to claim 8, characterized in that, All the flue gas inside the furnace is discharged through a dual air-fuel regenerator for flue gas exhaust.

Images