JP4000716B2 - Purge method for heat storage combustion deodorizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a purge method for a regenerative combustion deodorizer that recovers exhaust heat from combustion exhaust gas to increase combustion efficiency.
[0002]
[Prior art]
Conventionally, in the field of industrial furnaces or the like, so-called regenerative combustion furnaces that recover exhaust heat of combustion exhaust gas and improve combustion efficiency have been used.
[0003]
As shown in FIG. 3 (1), this regenerative fuel furnace is provided with a pair of regenerative burners A and B having a ceramic honeycomb regenerator 2 in a combustion chamber 1, and these regenerative burners A , B heat storage chambers 3 and 3 are connected to the combustion air line 4 and the exhaust gas line 5 respectively, such as combustion air sent from the combustion air line 4 and city gas supplied from the fuel injection section 7. One of the regenerative burners A functions as a burner with the fuel, and at the same time, the other regenerative burner B is stopped to function as an exhaust passage so that exhaust heat in the combustion exhaust gas generated in the combustion chamber 1 is stored. After being collected by the honeycomb type heat storage body 2 on the side of the burner B, after a lapse of a certain time (for example, about 30 seconds), as shown in FIG. 3 (2), the valve is provided by each line. Switch the ability to instantaneously, in which so as to improve the energy saving of readily combustion efficiency by preheating the combustion air by heat accumulation in the honeycomb-type regenerator 2.
[0004]
If odor gas containing bad odors and harmful components such as ammonia and unburned hydrocarbons is used as all or a part of the combustion air supplied to such a regenerative fuel furnace, this regenerative fuel furnace is simply used. It can be used not only as a combustion furnace but also as a deodorizing device.
[0005]
However, when such odor gas is used as all or part of the combustion air, the odor gas accumulated in the heat storage chamber 3 is released into the atmosphere from the exhaust gas line 5 together with the combustion exhaust gas when switching combustion, and the surrounding environment There is an inconvenience that makes it worse.
[0006]
Therefore, to prevent this, another heat storage burner C is added to the combustion chamber 1 as shown in FIG. 4 (1), and a purge line 8 is provided to each of the three heat storage burners A, B, C. There is a deodorizing apparatus which is connected and forcibly purges the odor gas accumulated in each heat storage chamber 3 into the combustion chamber 1 by flowing a part of the combustion exhaust gas flowing through the exhaust gas line 5 to the purge line 8 side. Proposed.
[0007]
That is, as shown in FIG. 4 (1), the valves of the respective lines 4, 5, and 8 are controlled so that the regenerative burner A functions as a burner and the regenerative burner C functions as an exhaust passage for a certain period of time. After the elapse of time, as shown in FIG. 4 (2), the combustion is switched to the regenerative burner C that stores heat by exhaust, and the regenerative burner B functions as an exhaust passage, and the predetermined value is supplied from the purge line 8 to the regenerative burner A side. Odor gas accumulated in the heat storage chamber 3 of the regenerative burner A by purging for a period of time, for example several seconds, is blown out into the combustion chamber 1 and burned, decomposed and non-brominated, and then stored as combustion exhaust gas. It will be exhausted from the type burner B. Thereafter, after a certain time has elapsed from this state, as shown in FIG. 4 (3), the combustion is switched to the regenerative burner B side and the regenerative burner A side is made to function as an exhaust passage, and the regenerative burner C is purged. As a result, the odor gas accumulated in the heat storage chamber 3 of the heat storage burner C is blown into the combustion chamber 1 and burned, decomposed and non-brominated, and then becomes combustion exhaust gas and exhausted from the heat storage burner B. The Rukoto.
[0008]
By switching the combustion / exhaust / purge switching repeatedly at regular intervals, the odor gas accumulated in the heat storage chambers 3 of the respective heat storage burners A, B, C is directly sent from the exhaust gas line 5 to the atmosphere. It is possible to avoid inconveniences such as being released into the water.
[0009]
[Problems to be solved by the invention]
By the way, in such a purge type deodorizing apparatus, the flow of each gas is controlled by opening and closing valves provided in the respective lines 4, 5, and 8, but generally provided in these lines. However, it is difficult to completely stop the gas flow when the valve is closed, and it is extremely small (for example, about 1%). However, a part of the gas leaks.
[0010]
And when this leaked gas is an odor gas containing a bad odor or harmful component such as ammonia or unburned hydrocarbon as described above in a high concentration, it is directly discharged from the exhaust line 5 into the atmosphere, It is possible that the environment of the environment will be deteriorated.
[0011]
That is, for example, as shown in FIG. 4 (1), when an odor gas is caused to flow to the burner A side, the odor gas passes through the valve A1 on the burner A side from the odor gas line 4, and most of the odor gas is left as it is. The odor gas is also supplied to the valve A2 that separates the odor gas line 4 from the exhaust gas line 5 or the valve C1 on the burner C side. Is reached, and a certain amount of pressure is applied. Therefore, a part of the odor gas leaks through the valve A2 or the valve C1 and is discharged from the exhaust gas line 5 into the atmosphere together with the exhaust gas. There is a risk of end.
[0012]
Further, when the combustion is switched from the state shown in FIG. 4 (1) to the state shown in FIG. 4 (2), the odor gas accumulated on the upstream side of the valve A2 leaks the valve A2 due to the purge pressure from the valve A3 side, and the exhaust gas is left as it is. At the same time, it may be discharged from the exhaust gas line 5 into the atmosphere.
[0013]
Therefore, the present invention has been devised in order to effectively solve such problems, and its purpose is to purge a novel regenerative combustion deodorizing apparatus capable of effectively avoiding odor gas leakage. Is to provide.
[0014]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is provided with at least three or more regenerative burners that are operated by sequentially switching a combustion mode, a purge mode, and an exhaust mode in a combustion chamber, and an intake / exhaust line extending from each of these regenerative burners. In addition, the odor gas line is connected to the odor gas line, the purge line, and the exhaust gas line, and the odor gas line is provided in the regenerative combustion deodorizer having a valve for controlling the flow of each gas in each branch line. A purge gas bypass line is connected to the upstream side of each valve provided on the exhaust gas line side, and a part of the purge gas is constantly purged from each purge gas bypass line to the upstream side of each valve. It is what I kept.
[0015]
As a result, the upstream side of each valve provided on the odor gas line and exhaust gas line side is always filled with purge gas, so even if a leak occurs in each valve, the leaking gas is harmless purge gas Therefore, it is possible to effectively avoid the inconvenience that the odor gas leaks through each valve and is released into the atmosphere as it is.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment for carrying out the present invention will be described with reference to the accompanying drawings.
[0017]
First, FIG. 1 shows one embodiment of a heat storage combustion type deodorizing apparatus according to the present invention.
[0018]
As shown in the figure, on the wall surface of the combustion chamber 1, there are three regenerative combustion burners A, B, C (hereinafter simply referred to as burner A) that are operated by switching the combustion mode, the purge mode, and the exhaust mode in order as in the prior art. , B, C).
[0019]
The burners A, B, and C are connected to intake / exhaust lines a, b, and c, respectively. The intake / exhaust lines a, b, and c are connected to the odor gas line 4, the exhaust gas line 5, and the purge gas line. The branch lines 4a, 5a, 8a and 4b, 5b, 8b and 4c, 5c, and 8c branched from the 8 side are connected so as to join together as a set.
[0020]
Further, these branch lines 4a, 5a, 8a, 4b, 5b, 8b, 4c, 5c, and 8c have valves A1, A2, A3, B1, B2, and B3 that are instantaneously driven by electric signals from electromagnetic valves or the like. , C1, C2, and C3 are provided in pairs to control the flow of gas in the branch lines 4a, 5a, 8a, 4b, 5b, 8b, 4c, 5c, and 8c. ing.
[0021]
Also, the purge gas line 8 is branched into six purge gas bypass lines P1, P2, P3, P4, P5, and P6. The odor gas branch lines 4a, 4b, and 4c are connected to the exhaust gas branch, respectively. It is connected to the upstream side of valves A2, B2, C2 on the lines 5a, 5b, 5c side. A part of the purge gas flowing in the purge gas line 8 is purged to the upstream side of the valves A2, B2, C2 via these purge gas bypass lines P1, P2, P3, P4, P5, P6.
[0022]
Next, an example of the purging method of the present invention using the regenerative combustion deodorizing apparatus configured as described above will be described with reference to FIG.
[0023]
First, as shown in FIG. 2 (1), an odor gas is supplied to the burner A to function as a combustion mode, the burner C as an exhaust mode (heat storage mode), and the burner B as a purge mode. The odor gas valve A1 of the branch line 4a, the exhaust gas valve C2 of the exhaust gas branch line 5c, and the purge gas valve B3 of the purge gas branch line 8b are opened, and the remaining valves A2, A3, B1, B2, C1, C3 are all closed. This can be achieved by supplying the odor gas from the odor gas line 4 and supplying the purge gas from the purge gas line 8 in this state.
[0024]
At this time, the odor gas flowing through the odor gas branch line 4a passes through the odor gas valve A1 together with a part of the purge gas bypassing the purge gas bypass line P1 and then flows through the odor gas valve A1 to the burner A side. The portion also flows to the exhaust gas branch line 5a and the purge gas branch line 8a.
[0025]
However, a part of the purge gas diverted from the purge gas line 8 always flows from the purge gas bypass line P2 to the upstream side of the exhaust gas valve A2 of the exhaust gas branch line 5a, and is filled or further exhausted to the upstream side of the exhaust gas valve A2. Since it is in the state of flowing backward through the branch line 5a, part of the odor gas cannot reach the exhaust gas valve A2.
[0026]
For this reason, even if the exhaust gas valve A2 is in a leak state, only the harmless purge gas (air) leaks, and a part of the odor gas leaks from the exhaust gas valve A2 and directly enters the atmosphere from the exhaust gas line 5. Will not be released. Note that when the purge gas valve A3 leaks, the leak from the valve A3 has no effect because it flows from the purge gas bypass line P1 to the odor gas bypass line 4a again via the purge line 8a.
[0027]
Next, in order to use the heat accumulated on the burner C side in this way, after a certain period of time, as shown in FIG. 2 (2), the odor gas valve A1, the exhaust gas valve C2, and the purge gas valve B2 are closed. This can be achieved by opening the odor gas valve C1, the exhaust gas valve B2, and the purge gas valve A3 and instantaneously switching the burner C to the combustion mode, the burner B to the exhaust mode, and the burner A to the purge mode. Even in this case, since the upstream side of the exhaust gas valve C2 in the vicinity of the odor gas valve C1 is purged from the purge gas bypass line P6 and filled with the purge gas, the odor gas leaks through the exhaust gas valve C2 and exhaust gas. There will be no leakage to the branch line 5c side. The switching control of each valve and the fuel supply / ignition control to each burner can be easily performed by sequence control using a microcomputer (not shown).
[0028]
Further, in order to use the heat accumulated on the burner B side in this way, after a certain time has passed, the odor gas valve C1, the exhaust gas valve B2, and the purge gas valve A3 are closed as shown in FIG. This can be achieved by opening the odor gas valve B1, the exhaust gas valve A2, and the purge gas valve C3 and instantaneously switching the burner B to the combustion mode, the burner A to the exhaust mode, and the burner C to the purge mode. Even in this case, since the upstream side of the exhaust gas valve B2 in the vicinity of the odor gas valve B1 is purged from the purge gas bypass line P4 and filled with the purge gas, the odor gas leaks through the exhaust gas valve B2 and exhaust gas. There will be no leakage to the branch line 5b side.
[0029]
Accordingly, in any combustion mode, it is possible to reliably prevent the odor gas from leaking through the exhaust valves A1, B1, and C1 and flowing out to the exhaust gas line 5 and being released into the atmosphere. .
[0030]
In the present embodiment, an example in which three heat storage combustion burners are provided for one combustion chamber 1 has been described. However, the number of the heat storage burners is not limited to three. As described in the range, if the number of installations is at least three or more, the object of the present invention can be sufficiently achieved.
[0031]
【The invention's effect】
In short, according to the present invention, since a part of the purge gas is purged from the existing purge line to the upstream side of each valve, the odor gas leakage is almost completely achieved despite the relatively simple configuration. Can be prevented. As a result, it is possible to prevent the surrounding environment from deteriorating and to exhibit excellent effects such as an increase in cost can be minimized.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a regenerative combustion deodorizer according to a method of the present invention.
FIG. 2 is an explanatory diagram showing an embodiment of the method of the present invention.
FIG. 3 is an explanatory view showing a conventional regenerative fuel furnace and an operation method thereof.
FIG. 4 is an explanatory view showing a deodorizing apparatus to which a conventional regenerative fuel furnace is applied and its operating method.
[Explanation of symbols]
1 Combustion chamber 4 Odor gas line 5 Exhaust gas line 8 Purge gas lines a, b, c Intake / exhaust lines A, B, C Regenerative combustion burner
4a, 4b, 4c Branch line for odor gas
5a, 5b, 5c Exhaust gas branch line
8a, 8b, 8c Purge gas branch line
A1, B1, C1 Odor gas valve
A2, B2, C2 Exhaust gas valve
A3, B3, C3 Purge gas valves P1 to P6 Purge gas bypass line

Claims (1)

The combustion chamber is provided with at least three regenerative burners that are operated by sequentially switching the combustion mode, the purge mode, and the exhaust mode, and the odor gas line, the purge line, and the exhaust gas are respectively provided in the intake and exhaust lines extending from each of the regenerative burners. In the regenerative combustion deodorization apparatus provided with a valve for branching and connecting to the gas line and controlling the flow of each gas in each branch line, each valve provided on the odor gas line and exhaust gas line side A heat storage combustion characterized in that a purge gas bypass line is branched from each of the purge lines on the upstream side, and a part of the purge gas is constantly purged from each of the purge gas bypass lines to the upstream side of each valve. Method of purging the type deodorizer.

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