JPS6018883B2 - Soot blower control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a soot blower, and particularly to a control device for a plurality of soot blowers provided corresponding to each heat transfer surface of a boiler device.

When the boiler equipment is operated, soot and ash adhere and accumulate on the heat transfer surfaces such as the water wall tube group in the furnace, deteriorating the heat exchange performance of the heat transfer surfaces, and as a result, the boiler equipment reduce the efficiency of

Therefore, it is necessary to operate the soot blower at an appropriate time to remove butterflies and the like that have adhered to and accumulated on the heat transfer surface. Conventionally, the soot blower was operated by a boiler operator who constantly measured the exhaust gas temperature and draft of the boiler equipment, and when the exhaust gas temperature or draft rose, the operator judged the necessity of operating the soot blower by comparing it with the operator's experience.

This is because there is a certain relationship between contamination on the boiler heat transfer surface and exhaust gas temperature and draft, so the degree of contamination on the heat transfer surface is estimated by measuring the exhaust gas temperature and draft, but in reality the degree of contamination on the heat transfer surface is estimated by measuring the exhaust gas temperature and draft. and draft etc. are the load on the boiler,
In other words, since it varies greatly depending on the amount of steam generated, the decision on when to operate the soot blower has had to rely on the experience of the boiler operator. For this reason, there are individual differences among operators when making decisions, and if the soot blower is not operated properly, the efficiency of the boiler device will decrease.

In addition, operators must constantly monitor changes in exhaust gas temperature and draft, which limits their time and reduces work efficiency. In order to improve these problems, a soot blower is normally operated regularly regardless of the degree of dirt on the heat transfer surface.

However, in this method, the injection medium (steam, air) is used to clean even the least contaminated heat transfer surface, which wastes the injection medium. In particular, when steam generated from a boiler device is used as an injection medium, it is necessary to compensate for the amount of steam that has been reduced, which requires additional fuel. Moreover, since even the hot surface of the bales, which is less contaminated, is cleaned, it takes a long time to operate the soot blower, which has disadvantages such as a reduction in the operating rate of the boiler system. Furthermore, in order to eliminate this drawback, the burner slope is controlled by detecting the steam temperature of the reheater of the boiler equipment, and a specific group of tubes from among the tube groups lined on the furnace wall at a predetermined burner slope is detected. A means for soot-blowing is disclosed in Japanese Patent Publication No. 42-18-18 No. 6.

However, such a method is effective because there is a certain causal relationship between the burner mirror slope and the steam temperature of the tube group, and it is effective because there is a certain causal relationship between the burner mirror tilt and the steam temperature of the tube group, and it is not possible to use heat transfer surfaces other than the tube group, such as overheating. This method has the disadvantage that it cannot be applied to soot blowing devices such as containers, evaporators, and economizers. The purpose of the present invention is to eliminate such drawbacks of the conventional technology, and to provide a soot blower that accurately detects the operating timing of the soot blower and which heat transfer surface requires cleaning among the heat transfer surfaces, and performs appropriate cleaning. There is a control device to provide counterfeiting.

In order to achieve this object, the present invention has a plurality of soot blowers corresponding to each heat transfer surface in a boiler apparatus and a contamination degree detection means for detecting the amount of dust adhesion, and each soot blower is operated individually. In a device equipped with a soot blower capable of cleaning a corresponding heat transfer surface, a memory that stores permissible limit values related to the efficiency of the boiler device of exhaust gas characteristic values discharged from the dust path for each load condition of the boiler device. a detection unit that detects the load condition and exhaust gas characteristic value of the boiler device; and a detection unit that detects the load condition and exhaust gas characteristic value of the boiler device; The present invention is characterized in that it is provided with a measurement command output means for giving a measurement command, and an operation command output means for giving a driving command to a required soot blower based on the detection value of each of the dirt degree detection means.

Embodiments of the present invention will be described below with reference to the drawings.

In the furnace of the boiler device 1, a plurality of, for example, a first heat transfer surface 2 and a second heat transfer surface 4, each of which is composed of a group of water wall tubes, etc., are provided. 1 soot blow 3 and 1
A first differential pressure gauge 12 is provided to measure the differential pressure between the upstream side and the downstream side of the exhaust gas on the heat transfer surface 2, and a pressure difference between the second soot tube 5 and the second heat transfer surface 4 is provided on the second civil heating surface 4. Second differential pressure gauge 1 that measures pressure
3 are provided respectively.

Each soot blower 3, 6 can be operated individually to clean the corresponding heat transfer surface 2, 4 with a jetting medium such as steam or air. Fuel such as oil or gas is supplied from the fuel pipe 8 to the burner 19 of the boiler device 1 and combusted in the furnace, and the generated combustion gas passes through each heat transfer surface 2 and 4 and flows from the flue 10 into the exhaust gas 2.
Emitted as 0.

The combustion of this fuel heats the canned water 21 in the boiler device 1, turns it into steam 22, and sends it through the steam pipe 6 to the place where the steam is used. The fuel pipe 8 has a fuel flow meter 9 that measures the amount of fuel used, the steam pipe 6 has a steam flow meter 7 that measures the amount of steam generated, and the dust pipe 10 has an exhaust gas temperature meter that measures the temperature of the exhaust gas 20. 11 and a draft gauge 18 for measuring the pressure of the draft exhaust gas 20 of the boiler device 1 are respectively provided. The fuel flow meter 9, the steam flow meter 7, the exhaust gas temperature meter 11, and the draft meter 18 each measure continuously, and each measured value is sent as a signal to the comparison judgment section of the control device 23 consisting of a microcomputer. 24. The control device 23 also includes a storage section 2.
5, which includes experimental data and calculated values related to the efficiency of the boiler, such as the relationship between the amount of steam generated and the amount of fuel used, the relationship between the amount of steam generated and the exhaust gas temperature, and the relationship between the amount of steam generated and draft. are compiled, and data for determining the so-called contamination tolerance limit of the heat transfer surface, which is one of the factors that affect the efficiency, is stored.

The boiler characteristics related to the amount of fuel used, exhaust gas temperature, contamination of heat transfer surfaces such as draft, etc., are collectively stored for each steam generation amount, that is, for each boiler load condition. As mentioned above, the steam flow meter 7, the fuel flow meter 9, the exhaust gas temperature meter 11
, the values actually measured by the draft meter 18 are input to the comparison/judgment section 24 of the control device 23, and the actually measured fuel usage amount, exhaust gas temperature, draft value, etc. under the boiler load condition (determined by the amount of steam generation) are as described above. The data inputted from the storage unit 25 are compared with each other.

While the boiler device 1 is in operation, if soot and ash adhere to and accumulate on the heat transfer surfaces 2 and 4 and the dirt becomes severe, the heat transfer efficiency on the heat transfer surfaces 2 and 4 will decrease, and the boiler load conditions will deteriorate. Compared to normal operation, the amount of fuel used increases, the exhaust gas temperature rises due to the poor heat recovery rate, and the draft value decreases due to poor fuel gas flow. Therefore, by comparing the actual measurement value with the data in the comparison/judgment section 24, the efficiency of the boiler is determined under the conditions of the actually measured steam generation amount, and thereby the contamination of the mirror heating surfaces 2 and 4 is within the permissible limit. It is possible to automatically determine whether the target has been reached. The comparison calculation result in the comparison/judgment section 24 is displayed on the instrument panel 16. The boiler operator can see the display on the instrument panel 16 and know whether the dirt on the heat transfer surfaces 2 and 4 has reached the allowable limit.

Based on this display, the operator controls the differential pressure gauge 12 to the control device 23.
. Differential pressures on the respective heat transfer surfaces 2 and 4 are measured by differential pressure gauges 12 and 13.

If there is a large amount of butterflies attached, the flow resistance of the combustion gas on the heat transfer surface will increase, so a large pressure difference will occur between the upstream and downstream sides of the heat transfer surface. Therefore, there is a heat transfer surface 2 that requires cleaning according to the measurement with the differential pressure gauges 12 and 13.
4 can be specified, and based on the result, the heat transfer surface 2
Give operating commands from the command panel 15 to the soot blowers 3 and 5 corresponding to the soot blowers 3 and 4;
Clean by blowing away the soot, etc. that has adhered to it with the spray medium.
Of course, if the efficiency of the boiler device is reduced due to other causes, the pressure measured by each differential pressure gauge will be small, and in this case no soot blower operation command will be output.

In addition, each measurement value inputted to the control unit 23 is recorded in the recording device 17 at regular intervals, and the soot blower 3
, 5 before and after operation are also recorded.

In order to detect the operating timing of the soot blower, that is, a decrease in the efficiency of the boiler device, it is possible to detect the above by measuring one of the boiler characteristics related to dirt on the heat transfer surface.
It is desirable to measure two or more characteristics together because it increases the accuracy of judgment.

The present invention has the above-described configuration, and since it is possible to accurately determine the operating timing of the soot blower and to identify the heat transfer surface that requires cleaning, the soot blower can be operated efficiently and the loss of the injection medium can be reduced. It is possible to improve the boiler equipment.

[Brief explanation of the drawing]

The figure is a schematic configuration diagram for explaining a control method of a soot blower according to an embodiment of the present invention. 1... Boiler device, 2, 4... Heat transfer surface, 3, 5... Soot blower, 12, 13...
...Differential pressure gauge, 22...Steam, 23...
-Control device, 24... Comparison/judgment section, 25...
...Memory department.

Claims (1)

[Claims] 1 It has a plurality of soot blowers corresponding to each heat transfer surface in the boiler equipment and a contamination degree detection means for detecting the amount of dust adhesion, and each soot blower is operated individually to clean the corresponding heat transfer surface. In the soot blower, the storage unit stores permissible limit values related to the efficiency of the boiler device of characteristic values of exhaust gas discharged from the flue according to the load conditions of the boiler device; a detection unit that detects an exhaust gas characteristic value; and a measurement command output unit that issues a measurement command to each of the dirt level detection units when the value detected by the detection unit is outside the tolerance range defined by the tolerance limit value; A control device for a soot blower, comprising operation command output means for giving an operation command to a required soot blower based on the detection value of each of the dirt level detection means.