JP5468359B2 - Thermal storage combustion deodorizer - Google Patents

Description

  The present invention relates to a regenerative combustion deodorization apparatus.

  Exhaust gas containing an organic odor component discharged from a paint factory or the like is regulated, and is generally treated by adsorbing the organic component to a liquid with a scrubber or the like. In the method of adsorbing organic components with liquid, the organic components in the exhaust gas cannot be completely removed, and organic components in the order of ppm remain. Therefore, a combustion deodorization device that removes all organic components in the exhaust gas by burning it with a flame is used, and among them, a heat storage combustion deodorization device that increases the thermal efficiency by supplying and exhausting air to the combustion chamber via a heat storage body (Regenerative Thermal Oxidizer) is known.

  In the heat storage type combustion deodorization apparatus, the raw gas containing the organic component is filled inside the heat storage body in the path for supplying exhaust gas to the combustion chamber. For this reason, immediately after switching between the supply air and the exhaust gas, the raw gas containing the organic components left in the exhaust-side heat storage body and in the immediately preceding piping is released to the atmosphere.

  In order to solve this problem, for example, as described in Patent Documents 1 to 3, three sets of heat storage bodies are provided, exhaust gas is supplied to the combustion chamber through the first heat storage body, and combustion is performed through the second heat storage body. A three-column type that performs so-called purging, which exhausts the treated gas and removes the raw gas left in the heat storage body or the immediately preceding pipe by passing a part of the exhausted gas through the third heat storage body A regenerative combustion deodorizer is used.

  Since the heat storage body has a bad flow space where gas tends to stay in the heat storage body, in order to completely remove the raw gas remaining inside the heat storage body, a certain amount of the treated exhaust gas is stored in the heat storage body. Must pass through.

  In an actual plant, the amount of exhaust gas containing organic components varies greatly depending on the operating conditions. For this reason, in the regenerative combustion deodorization apparatus, the flow rate of the processing gas is adjusted by changing the rotational speed of the fan in accordance with the exhaust gas emission amount. However, since the concentration of the organic component in the exhaust gas does not decrease even when the flow rate of the exhaust gas to be treated is reduced, the raw material gas containing substantially the same amount of organic component as that when operating at the maximum flow rate is taken into the heat storage body. . Therefore, regarding the purge of the heat accumulator, the raw gas containing the organic components remaining in the heat accumulator cannot be sufficiently removed unless a flow rate substantially the same as that when operating at the maximum flow rate is secured.

  Therefore, as shown in FIG. 5, in order to ensure the flow rate of the purge gas even when the rotational speed of the main fan 23 that supplies the exhaust gas to the combustion chamber 22 through the heat storage body 21 is reduced, There is actually a regenerative combustion deodorization apparatus in which a booster fan 24 is provided in the gas flow path. Thus, the regenerative combustion deodorization apparatus provided with the booster fan 24 has a problem that not only the equipment cost increases, but also the power consumption increases by the amount of the booster fan 24 and the running cost also increases.

JP-A-9-262434 Japanese Patent Laid-Open No. 10-071321 Japanese Patent Laid-Open No. 2008-185267

  In view of the above problems, it is an object of the present invention to provide a regenerative combustion deodorization apparatus capable of sufficiently purging a regenerator.

In order to solve the above-mentioned problem, the first aspect of the regenerative combustion deodorizer according to the present invention is:
Supply flow for supplying raw gas to one of the combustion chambers through any one of the heat storage chambers, a combustion chamber having a burner, three or more heat storage chambers each having a heat storage body and communicating with the combustion chamber, and a fan A passage, an exhaust passage for exhausting the treated gas from the combustion chamber through one of the heat storage chambers, a gas treated from the combustion chamber through one of the heat storage chambers, and the supply passage A purge flow path that circulates upstream of the fan, and an adjustment damper that is disposed upstream of the confluence of the purge flow path of the supply flow path or in the exhaust flow path, and controls the opening of the adjustment damper. , by adjusting the flow resistance of the upstream side or the exhaust passage of the confluence of the purge flow path of the feed channel, the gas flow rate of the purge flow path is assumed to be constant. In the present invention, the heat storage chamber including the heat storage body is not intended to be an independent space surrounded by walls, but is a space (gas) divided into three or more according to the structure of the heat storage body itself. Of the flow path).

Moreover, the 2nd aspect of the thermal storage type combustion deodorizing apparatus by this invention is a combustion chamber provided with a burner, each provided with a thermal storage body, and three or more thermal storage chambers connected with the said combustion chamber, and any of the said thermal storage chambers A supply flow path for supplying raw gas to the combustion chamber through the exhaust, a fan, an exhaust flow path for exhausting the processed gas from the combustion chamber through any of the heat storage chambers, and the downstream side of the fan A purge flow path branched from the exhaust flow path and circulating a part of the gas in the exhaust flow path to the combustion chamber through any of the heat storage chambers; and a downstream side of the branch point of the purge flow path of the exhaust flow path An adjustment damper disposed on the exhaust passage, the opening of the adjustment damper is controlled, the flow path resistance downstream of the branch point of the purge flow path of the exhaust flow path is adjusted, and the gas in the purge flow path is adjusted. It shall flow to ensure a constant

  According to these configurations, the flow resistance on the suction or discharge side of the fan is adjusted by the opening of the adjustment damper, and the gas flow rate in the purge flow path is kept constant, so before connecting to the exhaust flow path, The raw gas containing the organic component left inside the heat storage body can be sufficiently removed so that the organic component is not released to the atmosphere. Moreover, according to these structures, since a dedicated fan is not required to keep the flow rate of the purge flow path constant, the consumption of motive energy is small.

  In the first and second aspects of the heat storage type combustion deodorization apparatus of the present invention, the rotation speed of the fan may be controlled so as to keep the pressure of the most upstream flow in the supply flow path constant.

  According to this structure, it can drive | operate according to the discharge | emission amount of the waste gas which should be processed.

  In the first and second aspects of the heat storage type combustion deodorization apparatus of the present invention, the adjustment damper may be substantially fully opened at the maximum throughput of the heat storage type combustion deodorization apparatus.

  According to this configuration, since the flow resistance by the adjustment damper is minimized at the maximum processing amount, the fan load is small and the energy efficiency is high.

  As described above, according to the present invention, since the flow rate of the purge flow path is kept constant by the adjustment damper, the heat storage body can be sufficiently purged with less energy consumption.

It is a block diagram of the thermal storage type combustion deodorizing apparatus of 1st Embodiment of this invention. It is a block diagram of the thermal storage type combustion deodorizing apparatus of 2nd Embodiment of this invention. It is a block diagram of the thermal storage type combustion deodorizing apparatus of 3rd Embodiment of this invention. It is a block diagram of the thermal storage type combustion deodorizing apparatus of 4th Embodiment of this invention. It is a block diagram of the conventional heat storage type combustion deodorizing apparatus.

  Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows a regenerative combustion deodorizer 1 according to a first embodiment of the present invention. The heat storage type combustion deodorization apparatus 1 includes a combustion chamber 3 including a burner 2, a heat storage body 4, each of which includes three heat storage chambers 5 communicating with the combustion chamber 3, a fan 6, and a raw gas containing organic components. The supply flow path 7 for supplying the combustion chamber 3 through the heat storage chamber 5, the exhaust flow path 8 for releasing the gas burned in the combustion chamber 3 through the heat storage chamber 5 to the atmosphere, and the combustion treatment from the combustion chamber 3 through the heat storage chamber 5. A purge passage 9 for extracting a part of the gas and circulating it upstream of the fan 6 in the supply passage 7 is provided.

  The supply flow path 7, the exhaust flow path 8, and the purge flow path 9 are each provided with three opening / closing valves 10, 11, and 12 that select which heat storage chamber 5 is connected. The supply flow path 7 includes an adjustment damper 13 whose opening degree can be adjusted on the upstream side of the junction of the purge flow path 9 and a pressure detector 14 that detects the pressure of the raw gas on the most upstream side. The purge flow path 9 includes a flow rate detector 15 that detects the flow rate of the gas. The flow rate detector 15 may be, for example, a Pitot tube flow meter, an orifice flow meter, a vortex flow meter, or any other type.

  The regenerative combustion deodorization apparatus 1 introduces raw gas generated in an exhaust gas generation source (not shown) into the combustion chamber 3 through the supply flow path 7 and burns (oxidizes) organic components in the raw gas. The odor of the exhaust gas is removed and discharged from the exhaust passage 8 to the atmosphere. At that time, the heat of the high-temperature exhaust gas subjected to the combustion treatment is recovered by the heat accumulator 4, and the raw gas is supplied to the combustion chamber 3 through the heat-recovered heat accumulator 4 to preheat the raw gas and the fuel consumption of the burner 2. Is reduced.

  Since the raw gas containing the organic component remains inside the heat storage body 4 through which the raw gas has passed, the heat storage body 4 is subjected to heat recovery from the gas that is burned and released to the atmosphere. A part of the gas subjected to the combustion treatment is extracted through and is circulated to the supply flow path 7 via the purge flow path 9 to remove (purge) the raw gas containing the organic component remaining in the heat storage body 4. Accordingly, the open / close valves 10, 11, 12 are opened / closed so as to connect the heat storage chambers 5 of the heat storage type combustion deodorization apparatus 1 to the supply flow path 7, the purge flow path 9, and the exhaust flow path 8 in order.

  The fan 6 is driven by an inverter 16, and the rotation speed is controlled by a pressure control device 17 made of, for example, a PID controller so that the pressure detected by the pressure detector 14 is kept constant. Thereby, the quantity of the raw gas processed with the thermal storage type combustion deodorizing apparatus 1 is balanced with the quantity of the raw gas generated by the exhaust gas generation source not shown.

  The opening degree of the adjustment damper 13 is controlled by a flow rate control device 18 made of, for example, a PID controller so that the detected flow rate of the flow rate detector 15 becomes constant (about 5 to 10% of the maximum air volume of the fan 6). That is, when the gas flow rate in the purge flow path 9 is smaller than a predetermined set flow rate, the pressure on the suction side of the fan 6 is reduced by reducing the opening of the adjustment damper 13, and the fan 6 is moved from the purge flow path 9 to the fan 6. Increase the amount of gas sucked. Further, when the gas flow rate in the purge flow path 9 is larger than a predetermined set flow rate, the pressure on the suction side of the fan 6 is increased by increasing the opening of the adjustment damper 13, and the fan 6 is moved from the purge flow path 9 to the fan 6. Reduce the amount of gas inhaled. In this way, the regenerative combustion deodorizer 1 ensures the flow rate of the gas that purges the heat storage body 4 so as not to release the organic components contained in the raw gas into the atmosphere.

  The heat storage combustion deodorization apparatus 1 is designed so that the adjustment damper 13 is substantially fully opened at the maximum raw gas throughput, and the supply flow path 7 and the exhaust flow path 8 are set so that the suction resistance of the fan 6 is minimized. , And the diameter of the purge flow path 9 are selected. Actually, when the processing amount of the raw gas is slightly smaller than the designed maximum amount, the adjustment damper 13 is fully opened, and if the processing amount of the raw gas becomes more than that, the adjustable range of the adjustment damper 13 is reached. Therefore, the gas flow rate of the purge flow path 9 is designed to be slightly larger than the set flow rate. In addition, in the design stage, it is difficult to accurately predict the gas flow rates of the supply flow path 7, the exhaust flow path 8 and the purge flow path 9, so the piping resistance of the purge flow path 9 is designed to be small and the purge flow When the gas flow rate in the passage 9 becomes excessive and the maximum processing amount of the raw gas is limited, for example, an orifice is inserted into the purge flow passage 9 so that an appropriate gas flow rate balance can be realized. You may do it.

  Moreover, the adjustment damper 13 is fully closed when the operation of the regenerative combustion deodorizer 1 is stopped, and is also used as a stop valve for separating from the source gas generation source.

  In the present invention, since the flow rate of the gas for purging the heat accumulator 4 is secured by the adjustment damper 13, a fan for boosting the gas is not required in the purge flow path 9, and the consumption of power energy is small. In the regenerative combustion deodorization apparatus 1, the adjustment damper 13 increases the suction resistance of the fan 6 when the amount of raw gas generated from the exhaust gas generation source decreases. Therefore, the fan 6 may have the same capacity as that used in the conventional apparatus.

  Next, FIG. 2 shows a regenerative combustion deodorizer 1a according to a second embodiment of the present invention. In the following embodiments, the same components as those described above are denoted by the same reference numerals, and redundant descriptions are omitted.

  The regenerative combustion deodorization apparatus 1a of the present embodiment includes a differential pressure detector 15a that detects a differential pressure between the internal pressure of the combustion chamber 3 and the internal pressure of the purge flow path 9, and the differential pressure detector 18a is detected by the pressure control device 18a. The opening degree of the adjustment damper 13 is controlled so that the detected value of 15a becomes constant. That is, in the present embodiment, the gas flow rate in the purge flow path 9 is not directly detected, but the pressure difference between the combustion chamber 3 and the purge flow path 9 that determines the gas flow rate in the purge flow path 9 is detected to The gas flow rate in the flow path 9 is indirectly controlled.

  As shown in this embodiment, in the present invention, the gas flow rate in the purge flow path 9 may be detected by any index.

  In FIG. 3, the thermal storage type combustion deodorizing apparatus 1b of 3rd Embodiment of this invention is shown. In the heat storage type combustion deodorization apparatus 1b, the adjustment damper 13 is provided in the exhaust passage 8 and the supply passage 7 is provided with a stop valve 19 for disconnecting from the exhaust gas generation source.

  In the present embodiment, if the gas flow rate in the purge flow path 9 decreases, the flow resistance of the exhaust flow path 8 is increased, thereby increasing the internal pressure of the combustion chamber 3 and flowing into the purge flow path 9 through the heat accumulator 4. Increase the flow rate. If the gas flow rate in the purge flow path 9 increases, the flow resistance of the exhaust flow path 8 is lowered to lower the internal pressure of the combustion chamber 3 and the flow rate of gas flowing into the purge flow path 9 through the heat accumulator 4 is reduced. Decrease.

  Furthermore, in FIG. 4, the thermal storage type combustion deodorizing apparatus 1c of 4th Embodiment of this invention is shown. In this heat storage combustion deodorization apparatus 1c, a fan 6 is provided in the exhaust flow path 8, and the purge flow path 9 is branched from the downstream side of the fan 6 in the exhaust flow path 8, and part of the gas is stored in the heat storage chamber 5. To recirculate. In the present embodiment, the adjustment damper 13 is provided further downstream of the branch point of the purge flow path 9 of the exhaust flow path 8.

  In this embodiment, by providing the fan 6 in the exhaust flow path 8, the system inside the regenerative combustion deodorizing apparatus 1c is set to a negative pressure, and corrosion of equipment exterior parts and the like due to leakage is prevented.

DESCRIPTION OF SYMBOLS 1,1a, 1b, 1c ... Thermal storage type combustion deodorizing device 2 ... Burner 3 ... Combustion chamber 4 ... Thermal storage body 5 ... Thermal storage chamber 6 ... Fan 7 ... Supply flow path 8 ... Exhaust flow path 9 ... Purge flow path 10,11, DESCRIPTION OF SYMBOLS 12 ... Open / close valve 13 ... Adjustment damper 14 ... Pressure detector 15 ... Flow rate detector 15a ... Differential pressure detector 16 ... Inverter 17 ... Pressure control device 18 ... Flow rate control device 18a ... Pressure control device 19 ... Stop valve

Claims (4)

A combustion chamber with a burner;
Three or more heat storage chambers each comprising a heat storage body and communicating with the combustion chamber;
A supply flow path for supplying raw gas to the combustion chamber through any of the heat storage chambers,
An exhaust passage for exhausting the treated gas from the combustion chamber through any of the heat storage chambers;
A purge flow path for extracting the treated gas from the combustion chamber through any of the heat storage chambers and circulating it upstream of the fan in the supply flow path;
An adjustment damper disposed upstream of the confluence of the purge flow path of the supply flow path or the exhaust flow path ;
By controlling the opening of the adjustment damper and adjusting the upstream side of the confluence of the purge flow path in the supply flow path or the flow resistance of the exhaust flow path, the gas flow rate in the purge flow path becomes constant. A regenerative combustion deodorization device characterized by that. A combustion chamber with a burner;
Three or more heat storage chambers each comprising a heat storage body and communicating with the combustion chamber;
A supply flow path for supplying raw gas to the combustion chamber through any of the heat storage chambers;
An exhaust passage comprising a fan and exhausting the treated gas from the combustion chamber through any of the heat storage chambers;
A purge flow path that branches from the exhaust flow path on the downstream side of the fan and circulates part of the gas in the exhaust flow path to the combustion chamber through any of the heat storage chambers;
An adjustment damper disposed downstream of the branch point of the purge flow path of the exhaust flow path ,
Wherein by opening degree control of the control damper, by adjusting the flow resistance of the downstream side of the purge flow path of the branch point of the exhaust passage, the gas flow rate of the purge flow path is made to be constant A regenerative combustion deodorization device.   The regenerative combustion deodorization apparatus according to claim 1 or 2, wherein the rotation speed of the fan is controlled so as to keep the pressure of the uppermost stream in the supply flow path constant.   The regenerative combustion deodorization apparatus according to any one of claims 1 to 3, wherein the adjustment damper is substantially fully opened at a maximum processing amount of the regenerative combustion deodorization apparatus.

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