JP6529856B2 - Heat storage body maintenance time notification device of heat storage type burner, heat storage body maintenance time notification method of heat storage type burner, and remodeling method of combustion furnace using heat storage type burner - Google Patents

Description

  The present invention relates to a heat storage body maintenance time notification device of a heat storage type burner capable of appropriately notifying maintenance time of a heat storage body, a heat storage body maintenance time notification method of a heat storage type burner, and a combustion furnace using a heat storage type burner. It relates to the remodeling method.

  Conventionally, heat storage state and combustion state are repeated every predetermined time, and a heat storage type burner that preheats supplied combustion air by heat storage accumulated by passing exhaust gas generated by combustion forms a pair A direct-fired type that preheats combustion air supplied to the other burner by alternately burning the burners and storing the heat storage body accumulated by passing the exhaust gas generated by the combustion of one burner (for example, patent documents 1) and a regenerative radiant tube burner (see, for example, Patent Document 2) which burns a flame in a metal tube.

  The exhaust gas to be stored in the heat storage medium is mixed with dust in the furnace, scales of the processing material, vaporized compounds, and the like. As these dusts and the like adhere to the heat storage body, the passage of the circulating gas is gradually blocked. For this reason, the heat storage body needs periodic maintenance such as cleaning and replacement. However, the state of the heat storage can not be visually recognized from the outside. Therefore, the maintenance time of the heat storage body is set based on the cycle based on the experience of the user etc., or is performed based on the abnormality of the temperature of the exhaust gas detected before and after the heat storage body (for example, Patent Document 3).

JP 2002-98328 A JP-A-7-103435 JP-A-9-68310

  As described above, when the maintenance time of the heat storage body is set based on the period based on experience and the temperature before and after the heat storage body, the estimated state of the heat storage body matches the actual state of the heat storage body Not necessarily. For this reason, if the passage of the flowing gas formed between the heat storage bodies is blocked earlier than the set time, sufficient combustion air necessary for combustion is not supplied to the combustion furnace. Moreover, when maintenance is performed in accordance with reaching the set time despite the fact that the flow gas passage is sufficiently secured, the combustion furnace is unnecessarily stopped and the operation efficiency decreases. is there.

  The present invention has been made in view of the above-mentioned conventional problems, and is capable of appropriately notifying maintenance time of a heat storage body. Heat storage body maintenance time notification device of a heat storage type burner, heat storage body maintenance of a heat storage type burner It is an object of the present invention to provide a method of informing the timing and a method of remodeling a combustion furnace using a heat storage type burner.

  A heat storage unit maintenance timing notification device of a heat storage type burner according to the present invention is a flow meter for measuring the flow rate of flowing gas flowing through a heat storage type burner provided with a heat storage section having a heat storage body for preheating combustion air by exhaust gas A control valve for the flow gas that is opened and closed based on the measured flow rate of the flow gas, a detection unit that detects the degree of opening of the control valve when the flow gas has flowed a predetermined flow rate, and the flow meter measures The detected opening degree of the control valve becomes larger than the preset opening degree based on the correlation information between the flow rate data of the flowing gas and the opening degree data of the control valve detected by the detecting unit. And a notification means for notifying that it is a maintenance time for the heat storage body of the heat storage section.

The exhaust gas is measured as a flow rate of the flowing gas .

The combustion air is measured as a flow rate of the flowing gas .

  The method of informing the heat storage body maintenance time of the heat storage type burner according to the present invention comprises the heat storage section having the heat storage body for preheating combustion air by exhaust gas using the heat storage body maintenance time notification apparatus of the heat storage type burner. In the control valve of the flow gas, which is controlled to open and close based on the measured flow rate of the flow gas, the flow rate of the flow gas is a predetermined flow rate Detection step of detecting the opening degree of the control valve at the time of detection by the detection unit, flow rate data of the flowing gas measured by the flow meter, and opening degree data of the control valve detected by the detection unit When the detected opening degree of the control valve becomes larger than the preset opening degree based on the correlation information of Characterized in that it comprises a notification step of notifying the fact in the notification means.

  A method of remodeling a combustion furnace using a heat storage type burner according to the present invention is a flow meter for measuring the flow rate of flowing gas flowing through a heat storage type burner comprising a heat storage section having a heat storage body for preheating combustion air by exhaust gas. And a control valve for flowing gas controlled based on the measured flow rate of the flowing gas, and a detection unit having a detection unit for detecting the opening degree of the control valve when the flowing gas flows at a predetermined flow rate. The control valve detected based on the correlation information between the flow rate data of the flowing gas measured by the flow meter and the opening degree data of the control valve detected by the detection unit for the used combustion furnace. The method is characterized by including a step of additionally providing notification means for notifying that it is a maintenance time for the heat storage body of the heat storage unit when the opening degree of the heat storage unit becomes larger than the preset opening degree.

  In the heat storage unit maintenance time notification device of the heat storage type burner according to the present invention, the heat storage unit maintenance time notification method of the heat storage type burner, and the remodeling method of the combustion furnace using the heat storage type burner, the maintenance time of the heat storage unit is appropriate. Can be notified.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic systematic diagram which shows one suitable embodiment of the thermal storage body maintenance time alerting | reporting apparatus of the thermal storage type burner which concerns on this invention, and the remodeling method of a combustion furnace using a thermal storage type burner. It is an image figure of the correlation information of the air flow rate for combustion, and the opening degree of a supply flow control valve which shows one suitable embodiment of the heat storage body maintenance time informing method of the heat storage type burner concerning the present invention. In this embodiment, it is an image figure showing correlation information on an elapsed day from maintenance to a data collection day, and a degree of opening of a supply flow control valve at the time of 100% of a flow rate of air for combustion obtained in acquisition of data.

  In the following, preferred embodiments of a heat storage body maintenance timing notification device of a heat storage type burner, a heat storage body maintenance timing notification method of a heat storage type burner, and a modification method of a combustion furnace using a heat storage type burner are attached. This will be described in detail with reference to the drawings.

  As shown in FIG. 1, the combustion furnace 1 in the present embodiment is a combustion furnace 1 using a direct combustion type alternating combustion type heat storage type burner, and is connected to both the combustion chamber 2 and both sides of the combustion chamber 2. Storage burner 3 having a heat storage portion 3a and a heat storage body 3a such as a honeycomb structure, and a heat storage type burner 5 having a fuel nozzle 4, and a supply pipe 6 connected to each heat storage portion 3 for supplying combustion air. And an exhaust pipe 7 connected to each heat storage section 3 and connected to a chimney (not shown).

  In the combustion furnace 1, two regenerative burners 5 provided on both sides of the combustion chamber 2 make a pair facing each other, and a plurality of regenerative burners 5 forming a pair are orthogonal to the opposing direction Are provided side by side. Below, it demonstrates as a combustion furnace 1 being provided with a pair of thermal storage type burners 5. FIG. In the following description, the left-side regenerative burner 5 in FIG. 1 is also referred to as a left-thermal burner L5, and the right-side regenerative burner 5 is also referred to as a right regenerative burner R5.

  The supply pipe 6 and the exhaust pipe 7 are respectively connected to the left heat storage burner L5 and the right heat storage burner R5 via the branch part 5a. The supply pipe L6 on the left heat storage burner L5 side and the supply pipe R6 on the right heat storage burner R5 are connected to each other via the on-off switching valve 8, and the connection portion of the supply pipes 6 connected to each other Upstream from 5b, a supply blower 10 for taking in the outside air via a supply flow control valve 9 is provided.

  In addition, a supply flow meter 11 is provided between the supply flow control valve 9 and the supply blower 10, and the opening degree of the supply flow control valve 9 based on the information (flow rate) measured by the supply flow meter 11. Is controlled by the controller 12. Thus, the regenerative burner 5 is configured as a system including peripheral devices.

  The exhaust pipe L7 on the left heat storage burner L5 side and the exhaust pipe R7 on the right heat storage burner R5 are connected to each other via the on-off switching valve 13, and the connection portion of the exhaust pipes 7 connected to each other An exhaust blower 15 for suctioning the exhaust gas is provided downstream of 5 c via an exhaust flow control valve 14.

  Further, an exhaust flow meter 16 is provided between the exhaust flow control valve 14 and the exhaust blower 15, and the opening degree of the exhaust flow control valve 14 based on the information (flow rate) measured by the exhaust flow meter 16. Is controlled by the controller 12.

  In FIG. 1, the controller 12 is shown corresponding to each of the regenerative burners L5 and R5, but a single controller 12 controls the opening of the supply flow control valve 9 and the exhaust flow control valve 14 It does not matter.

  The left heat storage burner L5 and the right heat storage burner R5 supply the fuel gas and the combustion air to one of them to perform combustion, and at the same time suck the exhaust gas from the other, and perform the combustion operation and the suction operation By alternately performing the above, the exhaust heat is recovered from the exhaust gas in the heat storage section 3 at the time of suction operation, and the combustion air is heated by the exhaust heat recovered at the heat storage section 3 at the time of combustion operation.

  The supply / discharge system of the heat storage burners L5, R5 to the heat storage burners L5, R5, such as combustion air or exhaust gas, will be described according to the operating condition of the left heat storage burner L5. It is supplied to a heat storage type burner L5. The combustion air is introduced into the supply pipe 6 by the supply blower 10 when the supply flow control valve 9 provided on the upstream side of the connection portion 5b of the supply pipe L6 is opened, and the left is provided on the downstream side of the connection portion 5b. By opening the on-off switching valve 8 of the heat storage type burner L5, it is supplied to the left heat storage type burner L5 while passing through the heat storage section 3 and being preheated. During this combustion operation, the on-off switching valve 8 on the right heat storage burner R5 side is closed. At this time, the suction operation is being performed for the right heat storage burner R5, and accordingly, the on-off switching valve 13 and the exhaust flow control valve 14 are opened (in FIG. The closed state is shown in black).

  On the other hand, in the suction operation, the exhaust gas is discharged from the combustion chamber 2. The exhaust gas passes through the heat storage section 3 and the exhaust heat is recovered by opening the on / off switching valve 13 of the right heat storage burner R5 provided on the upstream side of the connection section 5c with the exhaust flow control valve 14 open. The air is sucked from the combustion chamber 2 by the exhaust blower 15 while the air flow rate is controlled. During this suction operation, the open / close switching valve 13 on the left heat storage burner L5 side is closed. At this time, the left heat storage type burner L5 is in the combustion operation, and accordingly, the on-off switching valve 8 and the supply flow control valve 9 are opened.

  In the alternating combustion type heat storage type burner, the supply blower 10 normally burns when the scale of the processing material contained in the exhaust gas, the vaporized compound, etc. adheres to the heat storage body 3a included in the left and right heat storage type burners L5 and R5. Even if the supply air is supplied and the exhaust blower 15 normally discharges the exhaust gas, the inside of the heat storage section 3 is clogged, and the flow rates of the exhaust gas and the combustion air decrease. When the supply amount of combustion air and the exhaust amount of exhaust gas decrease, desired combustion can not be obtained in the combustion chamber 2.

  Therefore, the controller 12 controls the opening degree of the supply flow control valve 9 based on the flow rate of the combustion air measured by the supply flow meter 11 provided between the supply flow control valve 9 and the supply blower 10. The controller 12 controls the opening degree of the exhaust gas flow control valve 14 based on the flow rate of the exhaust gas measured by the exhaust gas flow meter 16 provided between the exhaust gas flow control valve 14 and the exhaust blower 15.

  The controller 12 reduces the opening degree of the supply flow control valve 9 and the exhaust flow control valve 14 when the heat storage body 3a is clean and the gap in the heat storage portion 3 is large, ie, the clearance between the heat storage body 3a is large. (For example, when the scale or the vaporized compound adheres to the surface of the ceramic ball and the gap in the heat storage section 3 becomes smaller, the opening degree of the supply flow control valve 9 and the exhaust flow control valve 14 is increased to make the desired flow It controls so that can be obtained.

  As the heat storage type burner 5 is used, clogging occurs between the heat storage bodies 3a and the gap in the heat storage section 3 becomes gradually smaller, and the opening degree of the supply flow control valve 9 and the exhaust flow control valve 14 is maximized ( For example, even with 100%, it is not possible to obtain the flow gas flow rate (air flow rate for combustion, exhaust gas flow rate) necessary for desired combustion. Therefore, the combustion furnace 1 is provided with notification means for notifying the user etc. that the maintenance time has come before the flow gas flow rate necessary for desired combustion can not be obtained.

  The notification means is configured of a notification unit 17 such as a buzzer or a display that is controlled by a computer program executed by the controller 12, for example, and notifies that the maintenance time has come. That is, in the present embodiment, the controller 12 corresponds to a detection unit of the opening of the supply flow control valve 9 and the exhaust flow control valve 14, and the notification unit 17 corresponds to a notification unit. Here, the notification unit 17 may be a buzzer, a display, or the like provided in the controller 12.

  When the computer program for notifying the time of maintenance is executed by the controller 12, the flow of gas flowing in the combustion furnace 1, specifically, combustion air, every predetermined time, for example, every several dozen minutes to about one hour. And the flow rate of the exhaust gas is measured (measurement step). At this time, the measured flow rate of the flowing gas is acquired as data associated with the opening degree of the supply flow control valve 9 or the exhaust flow control valve 14. Here, the circulating gas may be the combustion air measured by the supply flow meter 11 or the exhaust gas measured by the exhaust flow meter 16, but here, the combustion air is the circulating gas. Explain as.

  The opening degree of the supply flow control valve 9 is, for example, a ratio with respect to a completely open state where the supply flow control valve 9 is completely closed as 0% opening, completely open as 100% opening. Is acquired as data. Further, the flow rate of the combustion air is set at 0% when not flowing and 100% of the flow rate of the combustion air required to cause the desired combustion in the combustion chamber 2 with respect to the flow rate of the combustion air required. The proportions are obtained as data. At this time, the pressure loss in the heat storage portion 3 is also affected by the temperature in the combustion chamber 2 separately from the degree of blockage of the heat storage portion 3, so it is converted to a constant furnace temperature, for example, a general operation furnace temperature Data to be acquired.

  From the data in which the flow rate of the combustion air and the opening degree of the supply flow control valve 9 are correlated, correlation information indicating the correlation between the flow rate of the combustion air and the opening degree of the supply flow control valve 9 is determined. An approximate curve showing the relationship of the opening of the supply flow control valve 9 to the flow rate is determined. The degree of opening of the supply flow control valve 9 (hereinafter referred to as “necessary flow rate”) for obtaining the flow rate of combustion air necessary to cause desired combustion (hereinafter referred to as required flow rate) at the time of data acquisition. It is detected as a required opening degree) (detection step). Data indicating the relationship between the flow rate of the combustion air and the opening degree of the supply flow control valve 9 is acquired once every several days or in sequence as appropriate.

  FIG. 2 is an image diagram showing the correlation information of the combustion air flow rate and the opening degree of the supply flow control valve 9. In FIG. 2, the image of the data acquired immediately after maintenance is indicated by .circle-solid., And the approximate curve thereof is indicated by A, and the image of the data acquired after the scale and the vaporized compound are attached to the heat storage body 3a. In ▲, the approximate curve is shown by B.

  In FIG. 2, the approximate curve B shows that the flow rate of the combustion air does not reach 100% even when the opening degree of the supply flow control valve 9 is 100%. That is, as the combustion furnace 1 operates, data obtained from the measurement results change from the approximate curve A side to the approximate curve B side.

  Before data such as the approximate curve B is acquired, for example, assuming that the required flow rate is 100%, the required flow rate can be obtained when the opening of the supply flow control valve 9 is 90%, etc. The notification unit 17 such as a buzzer or display is set to notify that the maintenance time has come.

  That is, an approximate curve which is periodically and repeatedly executed and shows the relationship between the flow rate of the combustion air and the opening degree of the supply flow control valve 9 is determined, and as shown in FIG. As shown in the approximate curve C, an approximate curve C is derived in which the required opening degree of the supply flow control valve 9 for obtaining the required flow rate (100% for the combustion air flow rate) is 90%. Then, when the point of the flow rate of the combustion air and the opening degree of the supply flow control valve 9 exceeds the approximate curve C, it is indicated that the controller 12 as the detection unit has reached the maintenance time of the heat storage body 3a. The notification unit 17 notifies (informing step).

  FIG. 3 shows the correlation information between the elapsed days from maintenance to the date of data collection and the opening degree (100% flow rate opening degree) of the supply flow control valve 9 when the combustion air flow rate obtained in data acquisition is 100% FIG. As shown in FIG. 3, an approximate curve D showing the relationship between the number of days elapsed from maintenance to the date of data acquisition and the degree of opening of the supply flow control valve 9 at 100% flow obtained in each data acquisition. When the required opening of the supply flow control valve 9 for obtaining 100% flow, for example, 100% opening must be made, notification is made when the required opening is 90%, for example. We can estimate the date of dew. Here, the graphs of FIG. 2 and FIG. 3 are shown for convenience of explanation, and in terms of program processing in the controller 12, the graph and the approximate curve may not be visualized.

  According to the heat storage unit maintenance time notification device of the combustion furnace, the heat storage unit maintenance time notification method of the combustion furnace, and the conversion method of the combustion furnace of the present embodiment, the flow rate data of the combustion air measured by the supply flow meter 11 On the basis of the correlation information with the opening data of the supply flow control valve 9 detected for that and the approximate curve, it is possible to recognize the clogging state of the heat storage body 3a more accurately according to the substance. Then, when the opening degree of the supply flow rate control valve 9 becomes larger than the preset opening degree (90% in the above embodiment), notification that maintenance time for the heat storage body 3a provided in the heat storage unit 3 is reached. Therefore, the maintenance time of the heat storage body 3a can be notified more appropriately.

  Thus, since the more appropriate maintenance time of the heat storage body 3a which can not be visually recognized from the outside is alert | reported, the maintenance time of the heat storage body 3a can be recognized irrespective of a worker's experience etc. Further, maintenance can be performed based on the measurement data and detection data in line with the actual state of the heat storage body 3a. For example, maintenance is performed in a state where the heat storage unit 3 is not clogged, and the combustion furnace 1 is useless. Or stopping the operation of the combustion furnace 1 in a state where the heat storage section 3 is clogged. Therefore, the combustion furnace 1 can be operated more efficiently.

  In addition, since the flow rate of the combustion air to be measured can be measured by the supply flow meter 9 already provided in the combustion furnace 1 to notify the maintenance time of the heat storage body 3a, the execution program is incorporated in the controller 12; By providing the notification unit 17, it can be realized easily and inexpensively. That is, even in the existing combustion furnace 1, the storage body maintenance time notification device of the combustion furnace 1 using the heat storage type burner by simply modifying the program by installing the program in the controller 12 and adding the notification unit 17; It is possible to realize the heat storage body maintenance time notification method of 1.

  In the above embodiment, the flowing gas to be measured is the combustion air supplied to the combustion chamber 2. However, the present invention is not limited to this, and the exhaust gas discharged from the combustion chamber 2 may be used. In that case, the code "6, 9, 10, 11" in the above description corresponds to the code "7, 14, 15, 16".

  In addition, although the above description takes the direct-fired storage type burner as an example, the present invention can be applied similarly to a storage type burner such as a storage type radiant tube burner. In that case, the combustion chamber 2 described above corresponds to the in-tube space of the radiant tube.

DESCRIPTION OF SYMBOLS 1 combustion furnace 2 combustion chamber 3 heat storage part 3a heat storage body 4 combustion nozzle 5 heat storage type burner 5a branch part 5b connection part 5c connection part 6 supply pipe 7 exhaust pipe 8 on-off switching valve 9 supply flow control valve 10 supply blower 11 supply flow meter 12 controller 13 open / close switching valve 14 exhaust flow control valve 15 exhaust blower 16 exhaust flow meter 17 notification section A approximate curve B approximate curve C approximate curve D approximate curve L5 left heat storage burner L6 supply pipe L7 exhaust pipe R5 right heat storage burner R6 Supply pipe R7 Exhaust pipe

Claims (5)

A flow meter for measuring the flow rate of the flowing gas flowing through a heat storage type burner provided with a heat storage section having a heat storage body for preheating combustion air by exhaust gas;
A control valve for the flow gas, which is opened and closed based on the measured flow rate of the flow gas,
A detection unit that detects the opening degree of the control valve when the flowing gas flows at a predetermined flow rate;
The detected control valve opening degree is preset based on correlation information between the flow rate data of the circulating gas measured by the flow meter and the control valve opening degree data detected by the detection unit. A heat storage unit maintenance timing notification device for a heat storage type burner comprising: notification means for notifying that it is a maintenance timing for the heat storage member of the heat storage section when the opening degree becomes larger than the opening degree. The heat storage body maintenance timing notification device according to claim 1 , wherein the exhaust gas is measured as a flow rate of the flowing gas . The heat storage unit maintenance timing notification device for a heat storage type burner according to claim 1 , wherein the combustion air is measured as a flow rate of the flowing gas . Using the heat storage body maintenance timing notification device of the heat storage type burner according to any one of claims 1 to 3,
Measuring the flow rate of the flowing gas flowing through the heat storage type burner including the heat storage section having the heat storage body for preheating the combustion air by the exhaust gas with the flow meter;
A detection step of detecting the opening degree of the control valve when the flowing gas flows through a predetermined flow rate, in the control valve of the flowing gas whose opening and closing are controlled based on the measured flow rate of the flowing gas;
The detected control valve opening degree is preset based on correlation information between the flow rate data of the circulating gas measured by the flow meter and the control valve opening degree data detected by the detection unit. And a notification step of notifying, by the notification means, that the maintenance time for the heat storage body of the heat storage section becomes larger than the opening degree, the method of notifying the heat storage body maintenance time of the heat storage type burner . A flow meter for measuring the flow rate of the flowing gas flowing through a heat storage type burner provided with a heat storage section having a heat storage body for preheating combustion air by exhaust gas;
A control valve for the flow gas, which is opened and closed based on the measured flow rate of the flow gas,
With respect to a combustion furnace using a heat storage type burner having a detection unit that detects the opening degree of the control valve when a flowing gas flows through a predetermined flow rate,
The detected control valve opening degree is preset based on correlation information between the flow rate data of the circulating gas measured by the flow meter and the control valve opening degree data detected by the detection unit. A method of remodeling a combustion furnace using a heat storage type burner, comprising the step of adding notification means for notifying that the maintenance time for the heat storage body of the heat storage section is larger than the opening degree.

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