JP5360400B2 - Combustion control method, combustion apparatus, and hot water apparatus provided with the combustion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion control method capable of appropriately diagnosing drive combustion even when the number of burner sensors is reduced and a burner includes a block which has a difficulty to detect flame temperature by the burner sensor. <P>SOLUTION: The combustion control method includes a step of diagnosing drive combustion of the burner 2A by detecting the flame temperature by using the burner sensor 3 during the drive combustion of the burner 2A. The combustion control method further includes a step of dividing the burner 2A into a first block B1 enabling detection of the flame temperature by the burner sensor 3 and a second block B2 having no burner sensor and preventing detection of the flame temperature, temporarily driving and burning the first block B1 and detecting the flame temperature of the first block B1 to diagnose the drive combustion when drive combustion of only the second block B2 is continued for a predetermined time or longer. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a method for controlling drive combustion of a burner such as a gas burner or an oil burner, a combustion apparatus suitable for carrying out this method, and a hot water apparatus such as a hot water supply apparatus equipped with this combustion apparatus.

  For example, in a hot water supply apparatus equipped with a burner, it is desirable to avoid the drive combustion from becoming in an inappropriate state as much as possible due to a short supply amount of combustion air during the drive combustion of the burner. It is. Therefore, conventionally, there is a means for detecting whether or not the flame temperature at the time of combustion drive is detected using a burner sensor and diagnosing whether or not the drive combustion state of the burner is in a good state based on this detected temperature (for example, , See Patent Document 1). On the other hand, in a burner used for a hot water supply device or the like, a means for dividing and burning the burner into a plurality of blocks is often used so that the heating power at the time of driving combustion can be easily switched to a plurality of stages. ing. Therefore, in the burner divided into a plurality of blocks in this way, when appropriately diagnosing whether the drive combustion of each block is in a good state, a plurality of burner sensors are used to It was customary to detect the flame temperature in each of the blocks.

  However, in the prior art, since it is necessary to use the same number of burner sensors as the number of burner blocks, the cost of parts of the plurality of burner sensors increases, and the manufacturing cost increases. Further, since the assembly structure of the plurality of burner sensors is complicated, the manufacturing cost is further increased.

  In Patent Document 1, a configuration is described in which the burner sensors are reduced in number, with some of the blocks of the burner being blocks not provided with the burner sensor. However, in the configuration described in the literature 1, when the burner is driven to burn, only when the block provided with the sensor is driven and burned, the block without the burner sensor is also driven and burned. Thus, it is substantially difficult to drive and burn a block without a burner sensor alone. That is, in the literature 1, if only the block not provided with the burner sensor is driven and burned, the flame temperature cannot be detected, and it is diagnosed whether the driven combustion is in a good state or not. This causes a problem that cannot be done.

JP 2003-247719 A

  The present invention has been conceived under the circumstances as described above, wherein the number of burner sensors is reduced, and the burner sensor is provided with a block in which flame temperature detection is difficult by the burner. However, it is an object of the present invention to provide a combustion control method capable of appropriately diagnosing drive combustion, a combustion device suitable for the method, and a hot water device including the combustion device.

  In order to solve the above problems, the present invention takes the following technical means.

  The combustion control method provided by the first aspect of the present invention includes the step of diagnosing the drive combustion by detecting the flame temperature using a burner sensor when the burner is in drive combustion. A first block capable of detecting a flame temperature by the burner sensor; and a second block in which the burner sensor is not provided and the flame temperature is not detected. When the drive combustion of only the second block continues for a predetermined time or longer, the first block is temporarily driven and burned, and the flame temperature of the first block is detected. It has the step which diagnoses the drive combustion.

  According to such a configuration, even when only the second block in which the burner sensor is not provided is driven and burned alone, when the drive combustion continues for a predetermined time, the first block is temporarily The combustion is performed and the diagnosis is made. Strictly speaking, this diagnosis is a diagnosis of driving combustion of the first block, but both the first and second blocks are parts for burning fuel under the same or substantially the same atmosphere or conditions. The diagnosis result can be used as the diagnosis result of the drive combustion of the second block. Therefore, even if only the second block is driven and burned alone, an effect that the diagnosis of the driven combustion can be substantially and appropriately performed is obtained. On the other hand, in the present invention, since the burner sensors are not provided in the second block, the total number of burner sensors can be reduced to reduce the component cost and thus the manufacturing cost.

  A combustion apparatus provided by the second aspect of the present invention includes a burner, a burner sensor for detecting a flame temperature when the burner is driven and burned, and the burner when the burner is driven and burned. Control means for diagnosing drive combustion of the burner based on a flame temperature detected by a burner sensor, wherein the burner is capable of detecting a flame temperature by the burner sensor. 1 and a second block in which the burner sensor is not provided and the flame temperature is not detected, and the control means is configured to perform driving combustion only in the second block for a predetermined time. When the operation is continued, control is performed to temporarily drive and burn the first block.

  According to such a configuration, when the second block without the burner sensor is driven and burned independently, the first block is temporarily driven and burned under the control of the control means, and the burner sensor Thus, the flame temperature is detected. Therefore, the combustion control method provided by the first aspect of the present invention is appropriately executed, and the same effect as described for the combustion control method can be obtained.

  A hot water apparatus provided by the third aspect of the present invention includes a combustion apparatus, and a heat exchanger that performs heat recovery from the combustion gas generated by the combustion apparatus and performs hot water heating. And the combustion apparatus provided by the 2nd side surface of this invention is used as said combustion apparatus, It is characterized by the above-mentioned.

  According to such a configuration, the same effects as those obtained by the combustion control method and the combustion apparatus provided by the first and second aspects of the present invention can be obtained.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is a schematic explanatory drawing which shows an example of the hot water apparatus provided with the combustion apparatus which concerns on this invention. It is a flowchart which shows an example of operation control of the control part with which the hot water apparatus shown in FIG. 1 was equipped. (A), (b) is principal part schematic explanatory drawing which shows the other example of this invention.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 and 2 show an embodiment of a combustion apparatus to which the present invention is applied and a hot water apparatus provided with the combustion apparatus. The hot water device WH of the present embodiment includes a combustion device C and heat exchangers 1A and 1B. The combustion apparatus C includes two burners 2A and 2B, a burner sensor 3, a fan 4, and a control unit 5.

  The two burners 2 </ b> A and 2 </ b> B are both gas burners and are arranged in the can 6. However, the inside of the can body 6 is partitioned into two space portions 60a and 60b by a partition plate 61, and the two burners 2A and 2B are provided separately in the two space portions 60a and 60b. The fan 4 is provided in the lower part of the can body 6, and the combustion air discharged from the fan 4 proceeds from the bottom side into the two burners 2 </ b> A and 2 </ b> B and passes through the hole of the perforated plate 62. It passes and advances also to the space parts 60a and 60b.

  The burner 2B and the heat exchanger 1B are for heating hot water for general hot water supply, and the combustion gas generated by the burner 2B is converted into primary and secondary heat exchange units 10b and 11b of the heat exchanger 1B. Are sequentially passed to the exhaust port 68. In such a process, sensible heat and latent heat are sequentially recovered from the combustion gas, and the hot water supplied to the water inlet 13b of the heat exchanger 1B is heated by the combustion gas and then desired hot water supply from the hot water outlet 14b. Supplied first. On the other hand, the burner 2A and the heat exchanger 1A are for performing hot water heating for heating. From the combustion gas generated by the burner 2A, the primary and secondary heat exchange parts of the heat exchanger 1A. The sensible heat and latent heat are sequentially recovered by 10a and 11a, and hot water (including antifreeze) supplied from the heating device (not shown) to the water inlet 13a is heated by the combustion gas, and then heated from the hot water outlet 14a to the heating device. Returned to The hot water heating means for general hot water supply needs to have a larger heating capacity than the hot water heating means for heating, and the burner 2B has a maximum thermal power greater than that of the burner 2A. The heat exchanger 1B has a larger heat transfer area than the heat exchanger 1A.

  The burner 2A includes a plurality of rows of combustion pipes 20, and is divided into first and second blocks B1 and B2. The first block B1 is a block including, for example, two rows of combustion tubes 20, and the burner sensor 3 is provided so as to be able to detect the flame temperature when the first block B1 is driven and burned. On the other hand, the second block B2 is a block including, for example, three rows of combustion tubes 20, but no burner sensor is provided at a location corresponding to the second block B2. As a result, the number of parts of the burner sensor is reduced. The fuel gas supply path 29 is provided so that the fuel gas can be appropriately switched and supplied to both or one of the first and second blocks B1 and B2 by opening and closing the valves V1 and V2. Therefore, in the burner 2A, only the first block B1 is driven and burned, only the second block B2 is driven and burned, and the first and second blocks B1 and B2 are driven and burned simultaneously. Therefore, it is possible to adjust the heating power in three stages.

  For the burner 2B, the combustion control method of the present invention is not applied for the reason described later to prevent a temporary increase in thermal power, and the combustion control method of the present invention is applied only to the burner 2A. Therefore, the burner 2B has the same configuration as that conventionally known. That is, although omitted in the drawing, the burner 2B is divided into, for example, a plurality of blocks capable of individually driven combustion, and a burner sensor (not shown) is individually provided for each of the plurality of blocks. It is set as the provided structure.

  The control unit 5 corresponds to an example of a control unit referred to in the present invention, and is configured using, for example, a microcomputer, and performs operation control of each unit of the hot water apparatus WH. This operation control includes control for coping with the fact that the burner sensor is not provided in the second block B2 of the burner 2A, and details thereof will be described later.

  Next, an example in which the combustion control method according to the present invention is implemented in the hot water device WH provided with the above-described combustion device C will be described. In addition, an example of the operation processing procedure of the control unit 5 will be described with reference to the flowchart shown in FIG.

  First, when the burner 2A is driven and burned, as described above, only the first block B1 is driven and burned, only the second block B2 is driven and burned, and the first and second blocks B1. , B2 are in a state where both are driven and burned. Of these, the flame temperature cannot be detected by the burner sensor 3 when only the second block B2 is in a state of being driven and burned. Therefore, when the state in which only the second block B2 is driven and burned continues for a preset time T1 (S1: YES, S2: YES), the control unit 5 forces the first block B1 at that time. Drive combustion is performed (S3).

  Next, when a preset time T2 has elapsed from the time when the drive combustion of the first block B1 is started (S4: YES), the control unit 5 uses the burner sensor 3 at that time to perform the first operation. The flame temperature of the block B1 is detected, and the drive combustion is diagnosed based on the detected temperature (S5). If the flame temperature is detected immediately after the driving combustion of the first block B1, the driving combustion is still in an unstable state and there is a possibility that the accurate flame temperature cannot be detected. After T2 has elapsed, it is possible to stabilize the drive combustion of the first block B1 and eliminate the above-described fear. In the diagnosis, for example, whether or not the supply amount of the combustion air to the burner 2A is in an appropriate range, and if the supply amount of the combustion air is not appropriate, whether or not the supply amount is excessive. Or it is judged whether it is in a shortage state. For example, when the gap between the plurality of fins of the heat exchanger 1A becomes clogged, the supply amount of combustion air tends to be insufficient. When the above-described diagnosis is completed, the control unit 5 immediately stops the drive combustion of the first block B1 (S6), and executes control reflecting the result of the diagnosis (S7). For example, this control reduces the rotational speed of the fan 4 when the supply amount of combustion air is excessive, and conversely, the fan decreases when the supply amount of combustion air is insufficient. In this control, the number of rotations of 4 is increased. Thereafter, when the drive combustion of the second block B2 is stopped, the series of controls described above is finished (S8: YES), but if not, the series of controls described above is repeatedly executed (S8). : NO, S1).

  According to the series of controls described above, when only the second block B2 is in drive combustion, the flame temperature cannot be detected directly, but by temporarily driving and burning the first block B1. The flame temperature is properly detected and the drive combustion is diagnosed. Strictly speaking, this diagnosis is a diagnosis of the drive combustion of the first block B1, but the first block B1 and the second block B2 have almost no combustion conditions such as the supply amount of combustion air. Since they are the same, the diagnosis result of the first block B1 is equivalent to the diagnosis result of the second block B2, and can be used as a highly reliable diagnosis result. In this hot water device WH, even when only the second block B2 is driven and burned alone, the combustion drive diagnosis is intermittently performed at a predetermined time T1 and the combustion air is supplied. It is possible to control the amount and the like, and it is possible to appropriately suppress that the drive combustion of the second block B2 is performed in an air-rich or gas-rich atmosphere. On the other hand, since the burner sensor corresponding to the second block B2 is not provided, the number of parts of the burner sensor can be reduced, and the manufacturing cost can be reduced.

  When only the second block B2 is in drive combustion, as described above, the first block B1 is temporarily driven and burned at every predetermined time T1, so that the burner 2A at that time This causes a phenomenon where the firepower of the plant increases temporarily. On the other hand, since the burner 2A is for heating hot water for heating, a phenomenon in which the heating power of the burner 2A is temporarily increased is allowed. That is, unlike the present embodiment, for example, it is not so preferable that the heating power of the burner 2B for general hot water supply temporarily increases. This is because hot water for general hot water supply may be used for showers, for example, and hot water supply at a stable temperature is strongly required. On the other hand, in the case of hot water heating for heating, compared with the case of hot water heating for general hot water supply, even if the hot water heating temperature rises temporarily, the heating function or the like is not adversely affected. It is acceptable because it is possible. However, unlike the present embodiment, the control method of the present invention may be applied to the drive control of the burner for general hot water supply as long as it is allowed to temporarily increase the heating power of the burner. It is.

  In the above embodiment, when the first block B1 is temporarily driven and burned while the drive combustion of only the second block B2 continues for a predetermined time T1, the first and second blocks B1 and B2 Although both are driven and burned, the present invention can be configured differently. That is, when the first block B1 is temporarily driven and burned, the driving combustion of the second block B2 is temporarily stopped, and the temporary driving combustion of the first block B1 ends. Then, the drive combustion of the second block B2 may be resumed. According to such a configuration, the time during which both the first and second blocks B1 and B2 are driven and burned can be eliminated or almost eliminated, and an effect of suppressing the phenomenon that the burner 2A increases in thermal power can be obtained.

  FIG. 3 shows another example of a burner to which the present invention is applied. In the figure, the same or similar elements as those in the above embodiment are given the same reference numerals as in the above embodiment.

  In the configuration shown in FIG. 3A, the burner 2C is divided into three blocks Ba to Bc, and these three blocks Ba to Bc individually supply fuel gas by opening / closing control of the valves V1 to V3. It is possible to drive and burn. Of the three blocks Ba to Bc, one block Ba corresponds to the first block B1 in the present invention, and the other two blocks Bb and Bc correspond to the second block B2 in the present invention. . In this burner 2C, in a state where the drive combustion of the block Ba is stopped, both the blocks Bb and Bc are driven and burned simultaneously, and only one of them is driven and burned. In addition, the combustion control method according to the present invention can be applied to temporarily drive and burn the block Ba (first block B1) to detect the flame temperature and execute the diagnosis. As will be understood from the present embodiment, in the present invention, even when the burner is divided not only into two blocks, but also into three or more blocks, the plurality of blocks are divided. Can be divided into the first block and the second block referred to in the present invention, and the present invention can be applied.

  In the configuration shown in FIG. 3B, of the three blocks Ba to Bc of the burner 2C, two blocks Ba and Bc correspond to the first block B1 in the present invention, and the other one block Bb. Corresponds to the second block B2 in the present invention. In such a configuration, when only the block Bb is driven and burned alone for a predetermined time or more, either one of the two blocks Ba and Bc is driven and burned, the flame temperature is detected, and the drive combustion is diagnosed. It is not necessary to drive and burn both of the two blocks Ba and Bc.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each step of the combustion control method according to the present invention can be variously changed. The specific configuration of each part of the combustion device and the hot water device according to the present invention can be varied in design in various ways.

  In the present invention, diagnosis of drive combustion is performed based on the flame temperature at the time of drive combustion of the burner, but the specific method and contents of this diagnosis are not limited. In addition, it is not essential to control the fan for supplying combustion air in accordance with the result of diagnosis, and for example, the structure may be such that the result of diagnosis is displayed on a predetermined display or the like. As the burner, for example, an oil burner can be used in place of the gas burner, and the specific type thereof is not limited. The combustion apparatus according to the present invention is not only used as a component of a hot water apparatus such as a hot water supply apparatus, but can also be configured as a combustion apparatus used for various other purposes.

Claims (3)

A combustion control method comprising a step of diagnosing the drive combustion by detecting the flame temperature using a burner sensor when the burner is in drive combustion,
The burner is divided into a first block capable of detecting a flame temperature by the burner sensor and a second block in which the burner sensor is not provided and the flame temperature is not detected,
When the drive combustion of only the second block continues for a predetermined time or longer, the first block is temporarily driven to burn, and the flame temperature of the first block is detected to diagnose the drive combustion The combustion control method characterized by having. With a burner,
A burner sensor for detecting the flame temperature when the burner is driving and burning;
Control means for diagnosing drive combustion of the burner based on a flame temperature detected by the burner sensor when the burner is in drive combustion;
A combustion device comprising:
The burner is divided into a first block in which the flame temperature can be detected by the burner sensor and a second block in which the burner sensor is not provided and the flame temperature is not detected.
The control means is configured to execute control to temporarily drive and burn the first block when the drive combustion of only the second block continues for a predetermined time or more. Combustion device. A combustion device;
A heat exchanger for performing hot water heating by recovering heat from the combustion gas generated by the combustion device;
A hot water device comprising:
A hot water apparatus, wherein the combustion apparatus according to claim 2 is used as the combustion apparatus.

Images