JP2002257331A - Exhaust mechanism and exhaust method in regenerative burner system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a regenerative burner system that, when only alternate combustion is performed, a flue for discharging high temperature exhaust gas can be arranged as small and inexpensive auxiliary flue compared with an ordinary combustion system but, when alternate combustion is not performed but combustion takes place in both burners, a flue as large and expensive as that of an ordinary combustion system is required and efficiency is lowered significantly when alternate combustion is not performed because exhaust heat can not be recovered through a heat storage body. SOLUTION: The exhaust mechanism in a regenerative burner system comprises an extra exhaust channel 13 interconnecting an exhaust channel in the downstream of a changeover valve and the inside of a furnace or a flue wherein the extra exhaust channel is provided with a changeover valve 14. When the exhaust gas flowing through the extra exhaust channel is cooled by a cooling means, an inexpensive changeover valve or exhaust blower 7 having low heat resistance can be employed for constituting the extra exhaust channel, and heat robbed from exhaust gas at the time of cooling can be utilized for preheating combustion air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an exhaust mechanism and an exhaust method in a regenerative burner system.

[0002]

2. Description of the Related Art A regenerative burner system includes:
A pair of burners filled with a heat storage material are alternately burned to perform highly efficient combustion by recovering exhaust heat.
8 shows a conventional example of a direct fire type regenerative burner system. In the illustrated system, the heat storage bodies a,
A pair of burners b and b 'filled with a' are provided in the furnace main body c, and each burner b and b 'is provided with an air supply blower d.
An exhaust passage i having switching valves h and h 'is connected between an air supply passage f provided with switching valves e and e' and an exhaust blower g. Further, a fuel gas supply channel k having gas switching valves j, j 'is connected to each of the burners b, b'.

FIG. 7 shows a state in which, in a normal alternating combustion of a regenerative burner system, a black-painted switching valve e ', h, j' in the drawing is closed and only a left burner b is burning. In this combustion state, approximately 7
After exhaust heat of 0 to 90% is recovered through the heat storage body a 'of the burner b' in the combustion stopped state, the exhaust gas is exhausted by the exhaust blower g through the exhaust passage i. And the remaining 10
Exhaust gas of about 30% is exhausted at a high temperature through a flue m provided in the furnace body c.

On the other hand, in the regenerative burner system, when the switching valves e, e ', h, h' fail or when the operation is necessary, both burners may be burned without performing alternation. Numeral 8 indicates such a combustion state, and the switching valves h and h 'of the exhaust passage i are both closed as shown by black in the figure. In such a combustion state, almost 100% of the exhaust gas is exhausted at a high temperature through the flue m.

[0005]

The regenerative burner system as described above has the following problems. a. First, when the regenerative burner system performs only the alternating combustion as described above, the flue for exhausting the high-temperature exhaust gas is small and inexpensive as an auxiliary flue as compared with a normal combustion system. However, if both burners are to be burned without alternation, a large and expensive flue equivalent to a normal combustion system is required. b. In addition, in the conventional regenerative burner system, when performing combustion without alternation, the exhaust heat cannot be recovered by the heat storage body, so that the efficiency is significantly reduced. Therefore, an object of the present invention is to solve such a problem.

[0006]

In order to solve the above-mentioned problems, according to the present invention, first, a pair of burners filled with a heat accumulator is provided in a furnace main body, and each burner is provided between the burner and an air supply blower. In a regenerative burner system in which an air supply passage provided with a switching valve is connected to the exhaust gas blower and an exhaust passage provided with a switching valve is connected to the exhaust blower, an exhaust passage downstream of the switching valve is provided. An additional exhaust flow path is provided for communication between the furnace and the furnace, and an exhaust mechanism in a regenerative burner system in which a switching valve is provided in the additional exhaust flow path is proposed.

Further, in the present invention, a pair of burners filled with a heat storage element is provided in the furnace main body, and each burner is connected to an air supply passage having a switching valve between the burner and the air supply blower. In addition, in a regenerative burner system having a configuration in which an exhaust passage provided with a switching valve is connected to an exhaust blower, an exhaust passage downstream of the switching valve is communicated with a flue provided in the furnace body. An exhaust mechanism in a regenerative burner system having an additional exhaust passage and a switching valve in the additional exhaust passage is proposed.

In the present invention, in the above configuration,
It is proposed to provide an outside air suction passage upstream of the switching valve in the additional exhaust passage.

Further, according to the present invention, in the above structure, a cooling device is provided in the additional exhaust passage, or a heat exchange is performed in the additional exhaust passage to exchange heat between exhaust gas flowing therethrough and air flowing in the air supply passage. It is suggested that a vessel be provided.

According to the present invention, the exhaust mechanism having the above-described structure is used. During non-alternating combustion, the exhaust valve in the furnace is closed with the exhaust valve and the exhaust valve in the furnace is opened by opening the additional valve in the additional exhaust channel. An exhaust method in a regenerative burner system in which suction and exhaust are performed is proposed.

According to the present invention, in a state where the switching valve of the additional exhaust passage is closed, the paired burners can be alternately burned by the supply passage and the exhaust passage. Most of the exhaust gas is exhausted through an exhaust passage, and a small amount of the remaining exhaust gas is exhausted at a high temperature through a flue provided in the furnace body.

On the other hand, when the paired burners are burned simultaneously without alternation, or when only one burner is burned, the switching valve of the additional exhaust passage is opened and the switching valve of the exhaust passage is closed. Since the exhaust gas in the furnace is exhausted by the exhaust blower through the additional exhaust passage, it is not necessary to exhaust all the exhaust gas in the furnace from a flue provided in the furnace body.

At this time, the exhaust gas flowing through the additional exhaust passage is
By cooling with the outside air flowing from the flue or the outside air suction passage, the switching valve and the exhaust blower can be prevented from being exposed to high-temperature exhaust gas.

The exhaust gas flowing through the additional exhaust passage can be cooled by providing a cooling device in the additional exhaust passage, and the exhaust gas flowing through the additional exhaust passage is exchanged with air flowing through the air supply passage. If cooled, exhaust heat recovery becomes possible.

[0015]

Next, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are systematic explanatory diagrams showing a first embodiment of a regenerative burner system according to the present invention. Reference numeral 1 denotes a furnace body, and heat storage bodies 2a, 2
A pair of burners 3a, 3b filled with b are provided in the furnace body 1. Each burner 3a, 3b has an air supply passage 6 provided with switching valves 5a, 5b between the burner 3a and 3b and the air supply blower 4. Is connected, and a switching valve 8a,
An exhaust passage 9 provided with an exhaust passage 8b is connected. Fuel gas supply passages 11 and 11 'having gas switching valves 10a and 10b are connected to the respective burners 3a and 3b.
The furnace body 1 is provided with a flue 12. And
In this embodiment, an additional exhaust passage 13 is provided for communicating the exhaust passage 9 downstream of the switching valves 8a and 8b with the inside of the furnace, and a switching valve 14 is provided in the additional exhaust passage 13.

In the above configuration, as shown in FIG.
When the switching valve 14 of the additional exhaust passage 13 is closed as shown in black in the figure, the burners 3a, 3b forming a pair
Can be alternately burned by the air supply passage 6 and the exhaust passage 9. That is, FIG. 1 shows a state in which the black-colored switching valves 5b, 8a, and 10b are closed and only the left burner 3a is burning, as in FIG. 7 described above. In this case, 80% of the exhaust gas is exhausted by the exhaust blower 7 through the exhaust passage 9 after the exhaust heat is recovered through the heat storage body 2b of the right burner 3b in the combustion stopped state and then recovered.
The remaining 20% of the exhaust gas is exhausted at a high temperature through a flue 12 provided in the furnace body 1. Contrary to the above, the black-colored switching valves 5b, 8a and 10b in FIG. 1 are opened, and the other non-black-colored switching valves 5a, 8b and 10b are opened.
If a is closed, it is possible to switch to a combustion state in which only the burner 3b on the right side in the figure burns.

Next, when both the burners 3a and 3b are burned without alternation when the switching valve fails or as necessary for operation, as shown in FIG. Valve 8
a and 8b are closed as indicated by black in the figure. In this state, the switching valve 14 of the additional exhaust passage 13 is closed.
Open.

In a state where both burners 3a and 3b are burning, the exhaust gas in the furnace passes through the additional exhaust passage 1
Since the exhaust gas can be exhausted by the exhaust blower 7 through the exhaust gas 3 and the remaining small amount of exhaust gas only needs to be exhausted from the flue 12, the flue 12 does not need to be large. The amount of exhaust gas exhausted through the additional exhaust passage 13 can be appropriately set from the entire amount to the majority. For example, in the illustrated example,
80% of the exhaust gas is exhausted through the additional exhaust passage 13,
The remaining 20% of the exhaust gas is set to be exhausted through the flue 12.

Next, FIG. 3 is a systematic explanatory view showing a second embodiment of the regenerative burner system of the present invention in a state where both burners are burning. The second embodiment is different from the first embodiment in that the communication part of the additional exhaust passage 13 on the furnace main body 1 side is provided inside the flue 12 instead of the furnace. Are the same as those in the first embodiment, and the corresponding components are denoted by the same reference numerals, and redundant description will be omitted.

However, in the second embodiment, when the exhaust gas in the furnace is sucked from the flue 12 into the additional exhaust passage 13, the outside air is also sucked from the downstream side of the flue 12. The high-temperature exhaust gas in the furnace flowing through the flow path 1 is diluted by the outside air, and the temperature decreases. As a result, the additional exhaust passage 13
Switching valve 14 and exhaust blower 7 exposed to exhaust gas flowing through
Need not be particularly high in heat resistance, and low heat resistance but low cost can be adopted.

Next, FIG. 4 is a systematic explanatory view showing a third embodiment of the regenerative burner system of the present invention in a state where both burners are burning. In the third embodiment, an outside air suction passage 15 is provided on the additional exhaust passage 13 in the first embodiment on the upstream side of the switching valve 14, and the other components are the same as those of the first embodiment. Therefore, corresponding components are denoted by the same reference numerals, and redundant description will be omitted.

In the third embodiment, the high-temperature exhaust gas flowing through the additional exhaust passage 13 is supplied to the outside air suction passage 15.
As in the second embodiment, the switching valve 14 and the exhaust blower 7 exposed to the exhaust gas flowing through the additional exhaust passage 13 are specially heat-resistant because the temperature is reduced by dilution by the outside air sucked from the air. Need not be high, and a low heat-resistant but low-cost one can be used.

Although not shown, the external air suction channel 15 may be provided in the additional exhaust channel 13 in the second embodiment on the upstream side of the switching valve 14. In this case, both the outside air sucked from the downstream side of the flue 12 and the outside air sucked from the outside air suction passage 15 can be used for diluting the high-temperature exhaust gas.

Next, FIG. 5 is a systematic explanatory view showing a fourth embodiment of the regenerative burner system of the present invention in a state where both burners are burning. In the fourth embodiment, the cooling device 1 is located upstream of the switching valve 14 in the additional exhaust passage 13 in the first embodiment.
6 and the other components are the same as those in the first embodiment, and the corresponding components are denoted by the same reference numerals and redundant description is omitted.

In the fourth embodiment, the high-temperature exhaust gas flowing through the additional exhaust passage 13 is cooled by the cooling device 16 having a structure such as a heat exchanger with the outside air, so that the high-temperature The switching valve 14 and the exhaust blower 7 which lower the temperature of the exhaust gas and are thus exposed to the exhaust gas flowing through the additional exhaust flow path 13 do not need to have a particularly high heat resistance. It is something that can be adopted.

In the fourth embodiment, at least one of the configurations of the second and third embodiments is combined, that is, the communication part of the additional exhaust passage 13 on the furnace main body 1 side is provided inside the furnace. In the flue 12 or the outside air suction passage 15
In the latter case, if the outside air suction flow path 15 is provided on the upstream side of the cooling device 16, the size and cost of the cooling device can be reduced in any case.

FIG. 6 is a systematic explanatory diagram showing a fifth embodiment of the regenerative burner system of the present invention in a state where both burners are burning. In the fifth embodiment, the exhaust gas flowing through the additional exhaust flow channel 13 and the air flowing through the air supply flow channel are located upstream of the switching valve 14 in the additional exhaust flow channel 13 in the first embodiment. A heat exchanger 17 for exchanging heat is provided,
Other components are the same as those of the first embodiment, and the corresponding components are denoted by the same reference numerals, and redundant description will be omitted.

In the fifth embodiment, as in the second to fourth embodiments, the temperature of the high-temperature exhaust gas flowing through the additional exhaust passage 13 is reduced, thereby reducing the temperature of the additional exhaust passage 13. It is not necessary to make the switching valve 14 and the exhaust blower 7 exposed to the exhaust gas flowing through the heat exchanger specially high in heat resistance. Since the heat taken from the exhaust gas can be used for preheating the combustion air, the efficiency can be improved even during alternating combustion.

Also in this fifth embodiment, a combination with the configuration of at least one of the above-described second and third embodiments, that is, the communication part of the additional exhaust passage 13 on the side of the furnace body 1 is replaced with a furnace. The inside can be replaced with the flue 12 or the outside air suction passage 15 can be provided. In the latter case, if the outside air suction passage 15 is provided on the upstream side of the heat exchanger 17, In this case, the heat exchanger can be reduced in size and cost.

[0030]

As described above, the present invention has the following effects. a. According to the first aspect of the present invention, in a state in which the switching valve of the additional exhaust passage is closed, the burners forming a pair by the air supply path and the exhaust path are alternately burned in the same manner as in a normal regenerative burner system. In addition, when the burners forming a pair are simultaneously burned without alternation, it is necessary to enlarge the flue of the furnace body by opening the switching valve of the additional exhaust passage and exhausting the exhaust gas in the furnace. Therefore, cost reduction and space saving can be achieved. b. In the invention of claims 2 to 5, it is not necessary to make the switching valve or the exhaust blower exposed to the exhaust gas flowing through the additional exhaust passage particularly high in heat resistance. Can be adopted. c. According to the fourth aspect of the invention, by combining with the second or third aspect, it is possible to reduce the size and cost of the cooling device. d. According to the fifth aspect of the present invention, it is possible to reduce the size and cost of the heat exchanger by combining with the second or third aspect. e. According to the fifth aspect of the present invention, the heat taken from the high-temperature exhaust gas can be used for preheating the combustion air, so that the efficiency can be improved even during the alternating combustion.

[Brief description of the drawings]

FIG. 1 is a systematic explanatory diagram showing a first embodiment of a regenerative burner system according to the present invention in an alternating combustion state.

FIG. 2 is a systematic explanatory diagram showing the first embodiment of the regenerative burner system of the present invention in an alternating combustion state.

FIG. 3 is a systematic explanatory view showing a second embodiment of the regenerative burner system of the present invention in a combustion state without alternation.

FIG. 4 is a systematic explanatory diagram showing a third embodiment of the regenerative burner system according to the present invention in a combustion state without alternation.

FIG. 5 is a systematic explanatory diagram showing a fourth embodiment of the regenerative burner system according to the present invention in a combustion state without alternation.

FIG. 6 is a systematic explanatory diagram showing a fifth embodiment of the regenerative burner system according to the present invention in a combustion state without alternation.

FIG. 7 is a systematic explanatory diagram showing a conventional regenerative burner system in an alternating combustion state.

FIG. 8 is a systematic explanatory view showing a conventional regenerative burner system in a combustion state without alternation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace main body 2a, 2b Heat storage body 3a, 3b Burner 4 Supply air blower 5a, 5b Switching valve 6 Supply air flow path 7 Exhaust blower 8a, 8b Switching valve 9 Exhaust flow path 10a, 10b Gas switching valve 11a, 11b Fuel gas supply flow Path 12 Flue 13 Additional exhaust flow path 14 Switching valve 15 Outside air suction flow path 16 Cooling device 17 Heat exchanger

Claims (6)

[The claims] A burner forming a pair filled with a heat storage body is provided in a furnace main body. Each burner is connected to an air supply flow path provided with a switching valve between the burner and an exhaust air blower. In a regenerative burner system having a configuration in which an exhaust flow path having a switching valve is connected therebetween, an additional exhaust flow path that communicates the exhaust flow path downstream of the switching valve with the furnace is provided.
An exhaust mechanism in a regenerative burner system, wherein a switching valve is provided in the additional exhaust passage. 2. A pair of burners filled with a heat storage body is provided in a furnace main body, and each burner is connected to an air supply passage provided with a switching valve between the burner and an exhaust blower. In a regenerative burner system having a configuration in which an exhaust flow path having a switching valve is connected therebetween, an exhaust flow path downstream of the switching valve and an additional exhaust flow path that communicates with a flue provided in the furnace body are provided. An exhaust mechanism in a regenerative burner system, wherein a switching valve is provided in the additional exhaust passage. 3. The external air suction flow path is provided upstream of the switching valve in the additional exhaust flow path.
Exhaust mechanism in regenerative burner system described in 4. The exhaust mechanism in a regenerative burner system according to claim 1, wherein a cooling device is provided in the additional exhaust passage. 5. A heat exchanger for exchanging heat between the exhaust gas flowing therethrough and the air flowing through the air supply passage in the additional exhaust passage. Exhaust mechanism in the described regenerative burner system 6. A non-alternating combustion system, wherein a switching valve of an exhaust passage is closed and a switching valve of an additional exhaust passage is opened to exhaust the exhaust gas from the furnace by an exhaust blower. An exhaust method in a regenerative burner system using the exhaust mechanism according to any one of claims 1 to 5.