TWI682128B - Maintenance time notification device and maintenance time notification method for heat accumulator in regenerative burner, and remodeling method for combustion furnace having regenerative burner - Google Patents

Abstract

This invention provides for a maintenance time notification device and maintenance time notification method for heat accumulator in regenerative burner, and remodeling method for combustion furnace having regenerative burner capable of appropriately notifying a maintenance time of a heat accumulator.

A maintenance time notification device for a heat accumulator in a regenerative burner includes a supply flowmeter 11 measuring a flow rate of a combustion air flowing a regenerative burner 5 having an accumulating part 3 incorporating a heat accumulator 3a for preheating the combustion air supplied to a combustion chamber 2 by an exhaust gas discharged from the combustion chamber in the combustion furnace 1, a supply flow rate control valve 9 being controlled a valve opening rate according to the measured flow rate of the combustion air, a controller 12 detecting the valve opening rate at a time that the combustion air flows a predetermined flow rate, and a notification part 17 notifying to the effect of a maintenance time for the heat accumulator in the accumulating part when the detected valve opening rate is larger than a predetermined valve opening rate according to a correlated information between the flow rate data of the combustion air measured by the flowmeter and the valve opening rate data detected by the controller.

Description

Reservoir maintenance period notification device of regenerative burner, method of notification of regenerator maintenance period of regenerative burner, and method of reforming combustion furnace using regenerative burner

The present invention relates to a regenerator maintenance time notification device of a regenerative burner that can properly notify the regenerator maintenance time, a method of notifying a regenerator maintenance time of a regenerative burner, and a method for reforming a combustion furnace using a regenerative burner .

In the past, as a regenerative burner that repeats the heat storage state and the combustion state at a predetermined time, and uses the heat storage body that generates heat by passing exhaust gas generated by combustion to preheat the supplied combustion air, it is known There is a pair of combustors that burn alternately, and preheat the combustion air supplied to another combustor by using a heat storage body that stores heat by passing exhaust gas generated by the combustion of one combustor A fire type (for example, refer to Patent Document 1) or a regenerative radiant tube burner that burns a flame in a metal tube (for example, see Patent Document 2).

The exhaust gas that stores the heat of the heat storage body is mixed with the dust in the furnace, the scale of the treatment material, the gasified compound, etc. As the dust and the like adhere to the heat storage body, the passage of the circulating gas will be gradually blocked. Therefore, the heat storage body needs regular maintenance such as cleaning or replacement. However, the state of the heat storage body cannot be visually recognized from the outside. Therefore, the maintenance period of the heat storage body is based on the period based on the experience of the user, etc. Instead, it is set or based on the abnormality of the exhaust gas temperature detected before and after the heat storage body (for example, refer to Patent Document 3).

[Prior Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2002-98328

Patent Document 2: Japanese Patent Laid-Open No. 7-103435

Patent Document 3: Japanese Patent Laid-Open No. 9-68310

As mentioned above, when the maintenance period of the heat storage body is set according to the period based on experience or the temperature before and after the heat storage body, the estimated state of the heat storage body does not necessarily coincide with the actual state of the heat storage body. Therefore, if the passage of the circulating gas formed between the heat storage bodies is blocked earlier than the set time, sufficient combustion air required for combustion cannot be supplied into the combustion furnace. In addition, even if the channel for circulating gas is sufficiently ensured to be unblocked, if maintenance is performed according to the set period, the burner will be unnecessarily stopped, and there will be a problem of reduced working efficiency.

The present invention has been completed in view of the above-mentioned conventional problems, and its object is to provide a regenerator maintenance time notification device for a regenerative burner that can appropriately notify the maintenance time of the regenerator, and a regenerator maintenance time notification of the regenerative burner Method, and transformation method of combustion furnace using regenerative burner.

The heat storage body maintenance time notification device of the heat storage type burner of the present invention is characterized by comprising: a flow meter for the heat storage type combustion provided in the heat storage unit The flow rate of the circulating gas flowing through the device is measured, and the regenerator has a regenerator that preheats the combustion air with exhaust gas; the control valve of the circulating gas is opened and closed according to the measured flow rate of the circulating gas A detection unit that detects the opening of the control valve when the circulating gas circulates at a predetermined flow rate; and a notification means based on the flow rate data of the circulating gas measured by the flow meter and the detection by the detection unit Relevant information of the opening data of the above-mentioned control valve, and when the detected opening of the control valve is greater than the preset opening, notify the intention of the maintenance period of the heat storage body of the heat storage unit.

It is characterized by measuring the flow rate of the exhaust gas discharged from the combustion chamber as the circulating gas.

It is characterized by measuring the flow rate of the combustion air supplied to the combustion chamber as the circulating gas.

The heat storage body maintenance time notification method of the heat storage burner of the present invention is characterized by using the heat storage body maintenance time notification device of the heat storage burner described above, and includes the following steps: a measurement step which uses The flow rate of the circulating gas flowing through the regenerative burner of the regenerator is measured. The regenerator has the regenerator that preheats the combustion air with exhaust gas; a detection step that uses the detector to detect In the above-mentioned control valve of the circulating gas whose flow rate of the measured circulating gas is opened and closed, the opening degree of the control valve when the circulating gas flows at a predetermined flow rate; and the notification step, which is based on the measured flow using the flowmeter The gas flow rate data and the related information of the opening data of the control valve detected by the detection part, and when the detected opening of the control valve is greater than the preset opening, the notification means is used to notify The purpose of the maintenance period for the heat storage body of the heat storage unit.

The method for reforming a combustion furnace using a regenerative burner of the present invention is characterized by including the step of adding notification means to the combustion furnace using a regenerative burner. The regenerative burner is provided with: a flow meter, which is equipped with The flow rate of the circulating gas flowing through the regenerative burner of the regenerator is measured. The regenerator has a regenerator that preheats the combustion air with exhaust gas; the control valve of the circulating gas is based on the measured flow The flow rate of the gas is adjusted for opening and closing; and the detection part detects the opening degree of the control valve when the circulating gas flows at a predetermined flow rate; the notification means is based on the flow rate data of the circulating gas measured by the flowmeter and using the above detection Relevant information of the opening data of the control valve detected by the department, and when the detected opening of the control valve is greater than the preset opening degree, it is notified that the maintenance period of the heat storage body of the heat storage unit has expired Purpose.

The heat storage body maintenance time notification device of the heat storage type burner of the present invention, the heat storage body maintenance time notification method of the heat storage type burner, and the transformation method of the combustion furnace using the heat storage burner can appropriately notify the heat storage body maintenance time.

1‧‧‧Burner

2‧‧‧combustion chamber

3‧‧‧Regenerator

3a‧‧‧regenerator

4‧‧‧ burner

5‧‧‧ Regenerative burner

5a‧‧‧Division

5b‧‧‧Connection

5c‧‧‧Connection

6‧‧‧Supply tube

7‧‧‧Exhaust pipe

8‧‧‧Open and close switching valve

9‧‧‧ Supply flow control valve

10‧‧‧Supply blower

11‧‧‧Supply flowmeter

12‧‧‧Controller

13‧‧‧Open and close switching valve

14‧‧‧Exhaust flow control valve

15‧‧‧Exhaust blower

16‧‧‧Exhaust flow meter

17‧‧‧Notification Department

A‧‧‧Approximate curve

B‧‧‧ approximate curve

C‧‧‧ approximate curve

D‧‧‧ approximate curve

L5‧‧‧Left regenerative burner

L6‧‧‧Supply tube

L7‧‧‧Exhaust pipe

R5‧‧‧Right regenerative burner

R6‧‧‧Supply tube

R7‧‧‧Exhaust pipe

FIG. 1 is a schematic system diagram showing a preferred embodiment of a heat storage body maintenance time notification device of a regenerative burner of the present invention and a method of reforming a combustion furnace using the regenerative burner.

FIG. 2 is a conceptual diagram showing information about the air flow rate of combustion and the opening degree of the supply flow rate control valve in a preferred embodiment of the method for notifying the heat storage body maintenance period of the regenerative burner of the present invention.

Figure 3 shows the process from maintenance until the date of data collection in this embodiment Conceptual diagram of the number of days passed and the information on the opening of the supply flow control valve when the combustion air flow rate obtained in the data acquisition is 100%.

Hereinafter, referring to the accompanying drawings, one of the preferred methods for regenerating the heat storage body maintenance time notification device of the heat storage burner of the present invention, the heat storage body maintenance time notification method of the heat storage burner, and the reforming method of the burner using the heat storage burner The embodiment will be described in detail.

As shown in FIG. 1, the combustion furnace 1 of the present embodiment is a combustion furnace 1 using a regenerative burner of a direct-fire type alternate combustion method, and has a combustion chamber 2 and a regenerative burner 5, which are respectively connected On both sides of the combustion chamber 2, there are a heat storage section 3 and a fuel burner 4 provided with a heat storage body 3a such as a ceramic ball or a honeycomb structure; a supply pipe 6 connected to each heat storage section 3 is provided for combustion Air; and exhaust pipe 7, which is connected to each heat storage section 3, and is connected to a chimney (not shown).

In the combustion furnace 1, two regenerative burners 5 provided on both sides of the combustion chamber 2 face each other to form a pair, and a plurality of regenerative burners 5 in pairs are arranged side by side facing each other The direction is orthogonal to the direction. Hereinafter, a description will be given of a pair of regenerative burners 5 provided in the combustion furnace 1. In the following description, the regenerative burner 5 on the left side in FIG. 1 is also referred to as a left regenerative burner L5, and the right regenerative burner 5 is referred to as a right regenerative burner R5.

The left regenerative burner L5 and the right regenerative burner R5 are connected to the supply pipe 6 and the exhaust pipe 7 via the branch 5a, respectively. The supply pipe L6 on the left regenerative burner L5 side and the supply pipe R6 on the right regenerative burner R5 side are connected to each other via an opening/closing switching valve 8, and are connected to the connecting portion 5b of the supply pipe 6 connected to each other Further upstream, a supply flow control valve 9 is provided to remove outside air 取入的 feeding blower 10.

In addition, a supply flow meter 11 is provided between the supply flow control valve 9 and the supply blower 10, and the supply flow control is controlled by the controller 12 based on the information (flow rate) measured by the supply flow meter 11 The opening of valve 9. In this way, the regenerative burner 5 is systematically constructed in cooperation with peripheral equipment.

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

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

In FIG. 1, the controller 12 is shown separately corresponding to the regenerative burners L5 and R5, but it can also be a single controller 12 to control the supply flow control valve 9 and the exhaust flow control valve 14 The composition of the opening.

The left regenerative burner L5 and the right regenerative burner R5 are configured such that while supplying fuel gas and combustion air to one of them for combustion, the exhaust gas is sucked from the other, by By alternately performing the combustion operation and the suction operation, the heat stored in the exhaust gas is recovered by the heat storage unit 3 during the suction operation, and burned by the exhaust heat recovered by the heat storage unit 3 during the combustion operation. Heat with air.

According to the operation state of the left regenerative burner L5, the combustion air, exhaust gas, etc. of the regenerative burners L5, R5 will be directed toward the supply and exhaust systems of the regenerative burners L5, R5. With the air system toward the left Supply by thermal burner L5. When the supply flow rate control valve 9 provided on the upstream side of the connecting portion 5b of the supply pipe L6 is opened, combustion air is introduced into the supply pipe 6 through the supply blower 10, and further through the downstream side of the connecting portion 5b. The opening/closing switching valve 8 of the left regenerative burner L5 is opened, and while being preheated by the regenerator 3, it is supplied to the left regenerative burner L5. During this combustion operation, the on-off switching valve 8 on the right regenerative burner R5 side is closed. At this time, the right regenerative burner R5 is in the suction operation, and along with this, the opening and closing switching valve 13 and the exhaust flow control valve 14 are opened (in the figure, the state where the valve is opened is shown by a hollow, and is shown in black) Is closed).

On the other hand, during the suction operation, exhaust gas is discharged from the combustion chamber 2. Exhaust is in a state where the exhaust flow control valve 14 is opened, and by opening and closing the switching valve 13 of the right regenerative burner R5 provided on the upstream side of the connecting portion 5c, the heat energy discharged through the regenerative portion 3 is recovered, While being controlled by the air volume, it is sucked from the combustion chamber 2 by the exhaust blower 15. During this suction operation, the on-off switching valve 13 on the left regenerative burner L5 side is closed. At this time, the left regenerative burner L5 is in a combustion operation, and accordingly, the opening/closing switching valve 8 and the supply flow rate control valve 9 are opened.

The regenerative burner of the alternate combustion method is provided to the blower if the heat storage body 3a equipped with left and right regenerative burners L5 and R5 adheres to rust and gasified compounds contained in the exhaust treatment material 10 The combustion air is normally supplied, and the exhaust blower 15 normally exhausts the exhaust gas, but the flow rate of the exhaust gas and the combustion air is reduced due to the blockage in the heat storage section 3. If the supply amount of combustion air and the discharge amount of exhaust gas are reduced, the desired combustion cannot be obtained in the combustion chamber 2.

Therefore, according to the flow rate of the combustion air measured by the supply flow meter 11 provided between the supply flow rate control valve 9 and the supply blower 10, the opening of the supply flow rate control valve 9 can be controlled by the controller 12 Degrees, and according to The flow rate of the exhaust gas measured by the exhaust flow meter 16 disposed between the exhaust flow control valve 14 and the exhaust blower 15 can be controlled by the controller 12 to control the opening of the exhaust flow control valve 14.

The controller 12 controls the opening 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 unit 3, that is, the gap between the heat storage bodies 3a is large, as follows And if rust, vaporized compounds, etc. adhere to the heat storage body 3a (for example, the surface of the ceramic ball) and the gap in the heat storage section 3 becomes smaller, the supply flow control valve 9 and the exhaust flow control valve are increased 14 degree of opening to get the desired flow.

As the regenerative burner 5 is used longer, the regenerators 3a will become clogged with each other, causing the gap in the regenerator 3 to gradually become smaller, even if the supply flow control valve 9 and exhaust flow control valve 14 are opened Set to the maximum (for example, 100%) , the desired gas flow (combustion air flow, exhaust flow) still cannot be obtained. Therefore, the combustion furnace 1 is provided with a notification means for notifying the user that the maintenance period has expired before it becomes impossible to obtain the desired flow rate of the circulating gas required for combustion.

The notification means is composed of, for example, a notification unit 17 such as a buzzer, a display, or the like, which is controlled by a computer program executed by the controller 12 to notify that the maintenance period has expired. That is, in this embodiment, the controller 12 corresponds to the detection section of the opening degrees of the supply flow control valve 9 and the exhaust flow control valve 14, and the notification section 17 corresponds to the notification means. Here, the notification unit 17 may be a buzzer or a display provided in the controller 12.

If the computer program for notifying the maintenance period is executed by the controller 12, the circulation will be measured every predetermined time, for example, every tens of minutes to about 1 hour The gas flowing in the combustion furnace 1 specifically measures the flow rate of combustion air or exhaust gas (measurement step). At this time, the measured flow rate of the circulating gas is obtained as data corresponding to the opening degree of the supply flow control valve 9 or the exhaust flow control valve 14. Here, the circulating gas may be either the combustion air measured by the supply flowmeter 11 or the exhaust gas measured by the exhaust flowmeter 16, where the combustion air is circulated Gas.

The opening degree of the supply flow control valve 9 is, for example, the state in which the supply flow control valve 9 is completely closed is set to an opening degree of 0%, and the state of a fully open state is set to an opening degree of 100%, which is relative to the state of the fully opened state The ratio is obtained as data. In addition, the flow rate of combustion air is set to 0% when it is not flowing, and the flow rate of combustion air required to produce the desired combustion in the combustion chamber 2 is set to 100%, relative to the required combustion Use the ratio of air flow as data. At this time, due to the pressure loss of the heat storage unit 3, in addition to the clogging state of the heat storage unit 3, it is also affected by the temperature in the combustion chamber 2, so it is set to be converted into a certain furnace temperature, such as a general operating furnace temperature. Get information.

According to the data that correlates the flow of combustion air with the opening of the supply flow control valve 9, relevant information showing the correlation between the flow of combustion air and the opening of the supply flow control valve 9 can be obtained and the display can be obtained The approximate curve of the relationship between the opening of the supply flow control valve 9 and the flow rate of the combustion air. From the approximate curve obtained, the opening degree of the supply flow control valve 9 (hereinafter referred to as the required flow rate) of combustion air required to generate the desired combustion at the time of data acquisition is checked ( Hereinafter, referred to as required opening) (detection step). Such data showing the relationship between the opening degree of the supply flow rate control valve 9 and the flow rate of the combustion air can be obtained once in a few days or repeatedly in sequence as appropriate.

FIG. 2 is a conceptual diagram showing information about the flow rate of combustion air and the opening degree of the supply flow control valve 9. In Fig. 2, the image of the data obtained immediately after maintenance is displayed with ●, and the approximate curve is displayed with A, and the data obtained after rust, vaporized compounds, etc. are attached to the heat storage body 3a are displayed with ▲ The image of the data, and its approximate curve is shown in B.

In FIG. 2, the approximate curve B shows that even if the opening of the supply flow control valve 9 is 100%, the flow rate of the combustion air does not reach 100%. That is, with the operation of the combustion furnace 1, the data available from the measurement results will gradually change from the approximate curve A side to the approximate curve B side.

It is set in advance to notify the notification period 17 of a buzzer, a display, etc. that the maintenance period of the following content is required: before obtaining data such as the approximate curve B, and for example, 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%.

That is, it is periodically and repeatedly executed in sequence, and an approximate curve showing the relationship between the flow rate of the combustion air and the opening of the supply flow rate control valve 9 can be obtained, and as shown in FIG. 2, before the approximate curve B The approximate curve C is derived by approximating the curve C in order to obtain the required flow rate (100% of the air flow for combustion) of the supply flow control valve 9 at a required opening of 90%. Then, when the direction of the flow rate of the combustion air and the opening of the supply flow rate control valve 9 exceeds the approximate curve C, the controller 12, which is the detection unit, notifies the expired heat storage body 3a of the need for maintenance through the notification unit 17 The purpose of the period.

Fig. 3 shows the number of days elapsed from maintenance to the date of data collection, and the opening degree of the supply flow control valve 9 (100% flow rate opening) when the combustion air flow rate obtained from the data acquisition is 100% A conceptual diagram of relevant information. As shown in Figure 3 As shown, if an approximate curve showing the relationship between the number of days elapsed from maintenance to the date of data acquisition and the opening of the supply flow control valve 9 at 100% flow rate obtained from each data acquisition is obtained D, it is possible to estimate the date when the required opening degree of the supply flow control valve 9 in order to obtain 100% flow rate, for example, must be before 100% opening degree, for example, when the required opening degree is set to 90%. Here, the curves of FIG. 2 and FIG. 3 are shown for convenience of description, and the program processing of the controller 12 may not visualize the curve or the approximate curve.

According to the regenerator maintenance time notification device of the burner of the present embodiment, the regenerator maintenance time notification method of the burner, and the reforming method of the burner, the flow rate data of the combustion air measured by the supply flowmeter 11 can be used 1. Relevant information and approximate curve of the opening data of the supply flow control valve 9 detected with respect to the flow data to know the more accurate blockage state of the heat storage body 3a in line with the facts. Moreover, when the opening degree of the supply flow control valve 9 is larger than the predetermined opening degree (90% in the above-mentioned embodiment), it is notified that the maintenance period of the heat storage body 3a provided in the heat storage unit 3 has expired, Therefore, the maintenance time of the heat storage body 3a can be notified more appropriately.

In this way, since it is possible to notify the more appropriate maintenance time of the heat storage body 3a that cannot be visually recognized from the outside, the maintenance time of the heat storage body 3a can be known without the experience of the operator or the like. Furthermore, since maintenance can be performed based on measurement data and detection data that match the actual condition of the heat storage body 3a, it is possible to prevent, for example, performing maintenance in a state where the heat storage unit 3 is not clogged, and uselessly stopping the combustion furnace 1, or in the heat storage unit 3 The state where the burner 1 continues to operate in a clogged state. Therefore, the combustion furnace 1 can be operated more efficiently.

In addition, in order to notify the maintenance period of the heat storage body 3a, due to The measured flow rate of combustion air can be measured by the supply flowmeter 11 originally provided in the combustion furnace 1, so by integrating the execution program into the controller 12 and having the notification section 17, it is easy Realize it cheaply. That is, even in the existing burner 1, as long as the program is installed in the controller 12, and a simple modification of the addition of the notification part 17, the maintenance period of the regenerator of the burner 1 using the regenerative burner can be achieved Notification device, method for notifying maintenance time of regenerator of combustion furnace 1

In the above embodiment, the measured circulating gas is used as the combustion air supplied to the combustion chamber 2, but it is not limited to this, and may be exhaust gas discharged from the combustion chamber 2. In this case, the symbols "6, 9, 10, 11" in the above description correspond to the symbols "7, 14, 15, 16".

In addition, although the above description takes a direct-fire type regenerative burner as an example, it is also applicable to regenerative burners such as regenerative radiant tube burners. In this case, the combustion chamber 2 in the above description corresponds to the space inside the radiant tube.

B‧‧‧ approximate curve

C‧‧‧ approximate curve

Claims (5)

A heat storage body maintenance time notification device for a regenerative burner is characterized by comprising: a flow meter that measures the flow rate of a circulating gas flowing through a regenerative burner provided with a regenerator, the regenerator having A regenerator that preheats combustion air with exhaust gas; a control valve for circulating gas that opens and closes according to the measured flow rate of the circulating gas; a detection section that controls the aforementioned control valve when the circulating gas flows at a predetermined flow rate Detection of the opening of the valve; and a notification means based on the relevant information of the flow data of the circulating gas measured by the flow meter and the opening data of the control valve detected by the detection section When the opening degree of the control valve is greater than the preset opening degree, it is notified that the maintenance period for the heat storage body of the heat storage unit has expired. A heat storage body maintenance timing notification device for a regenerative burner according to claim 1, wherein the exhaust gas is measured as the flow rate of the circulating gas. A heat storage body maintenance timing notification device for a regenerative burner according to claim 1, wherein the combustion air is measured as the flow rate of the circulating gas. A method for notifying the heat storage body maintenance period of a regenerative burner, characterized by using the heat storage body maintenance period notification device of the regenerative burner described in any one of claims 1 to 3, and comprising the following steps: a measurement step , Which uses the flowmeter to measure the flow rate of the circulating gas flowing through the regenerative burner provided with the regenerator, which has the regenerator that preheats the combustion air with exhaust gas; A detection step which uses the detection section to detect the opening degree of the control valve of the circulating gas whose opening and closing adjustment is based on the measured flow rate of the circulating gas when the circulating gas flows at a predetermined flow rate; and the notification step, which According to the relevant information of the flow data of the circulating gas measured by the flowmeter and the opening data of the control valve detected by the detection part, the detected opening of the control valve is greater than the preset At the time of opening, the above-mentioned notification means is used to notify the intention that the maintenance period of the heat storage body of the heat storage unit has expired. A method for transforming a burner using a regenerative burner, characterized in that it includes the step of adding notification means to the burner using a regenerative burner. The regenerative burner is provided with: a flow meter, which is equipped with The flow rate of the circulating gas flowing through the regenerative burner of the regenerator is measured. The regenerator has a regenerator that preheats the combustion air with exhaust gas; the control valve of the circulating gas is based on the measured flow The flow rate of the gas is adjusted for opening and closing; and the detection part detects the opening degree of the control valve when the circulating gas flows at a predetermined flow rate; the notification means is based on the flow rate data of the circulating gas measured by the flowmeter and using the above detection Relevant information of the opening data of the control valve detected by the department, and when the detected opening of the control valve is greater than the preset opening degree, it is notified that the maintenance period of the heat storage body of the heat storage unit has expired Purpose.

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