JPS6241634B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is a dry cooling tower for grain agglomerates, in which the correspondence between the cut agglomerates and the cut-out valve that cut them out is made clear, and the The present invention relates to a method for determining the temperature of cut agglomerates, which makes it possible to determine the temperature state of the agglomerates inside a cooling tower by measuring the temperature of the external agglomerates discharged from the cooling tower.

[Prior Art] In the fields of steel manufacturing and chemical industry, cooling of high-temperature granules is carried out by various methods. Among them, there is a dry cooling method for the purpose of recovering waste heat from granules. This method involves putting high-temperature agglomerates into a column, circulating cooling gas to recover the sensible heat of the agglomerates, and converting it into steam energy in a boiler, and is used in red-hot coke extinguishing equipment.

An example of a conventional coke dry cooling tower is:
As shown in FIG. 1, reference numeral 1 denotes a column body, which is provided with an inlet 2 at the top for introducing high-temperature coke, and an outlet 3 at the bottom for discharging cooled coke. The upper part of this tower body 1 is connected to the upper part of a boiler 5 via a communication pipe 4, and the bottom part of the boiler 5 and the lower part of the tower body 1 are connected by a connecting pipe 7 with a fan 6 interposed therebetween. (Inert gas, etc.) can be circulated by driving a fan 6. A cutoff valve 8 is installed at the cutoff port 3 to cut out the coke in small batches, and the operation of the cutoff valve 8 forms a downwardly moving layer of coke in the column body 1. Therefore, the moving bed of coke flows countercurrently with the cooling gas, and the coke is cooled and extinguished, and the cooling gas is heated to a high temperature. According to this, the coke can be extinguished and the boiler 5 can be heated by the sensible heat of the coke via the cooling gas, so that the energy saving effect can be improved. In addition, 9 is an upper bunker, and the upper gate 10 is attached so that it can be opened and closed.
Also, 11 is the lower bunker, and the lower gate 1
2 is attached so that it can be opened and closed.

Such a coke dry cooling tower has a problem in that the coke is not cooled uniformly. If the non-uniformity became noticeable, high temperature coke would be mixed in the coke cut out from the cutout port 3 by the cutoff valve 8, which was dangerous. For this reason, conventionally,
A plurality of temperature detection ends are arranged on the circumferential wall of the column body 1 to monitor non-uniform cooling of coke during operation, and when a large difference occurs in the temperature distribution on the circumferential wall, it is approximated as non-uniform cooling. Judging from the objective and correlation, the cutoff valve 8 was closed and the discharge of coke was stopped. However, stopping the discharge of coke is undesirable because it limits production capacity. In order to deal with the non-uniform cooling of coke without stopping the coke discharge, it is possible to assume in advance the non-uniform flow of cooling gas and coke and design the shape of the column body 1 to match this. but,
In this case, there is a margin in the cooling capacity and the shape of the tower body 1 becomes large, which impairs economic efficiency as a facility for recovering the sensible heat of coke. On the other hand, in order to deal with non-uniform cooling of coke, it is possible to consider a method of changing the supply amount of cooling gas in response to the non-uniform cooling. That is, the cooling gas supply equipment is divided and provided, and the supply amount is increased to the under-cooled section and the supply amount is decreased to the over-cooled section, thereby uniformly cooling the coke. Furthermore, there is also a method of dividing the outlet of the cooling gas and appropriately limiting the amount of each gas discharged, thereby making coke cooling more uniform. There is also a method of increasing the amount of cooling gas supplied as a whole in order to supply cooling gas corresponding to the minimum amount required for cooling to the non-uniform cooling section. According to these methods of changing the supply amount of cooling gas, due to the bias in the particle size distribution of coke in the column body 1, the rising speed distribution of the cooling gas changes as shown in FIG.
Even if the velocity is lower at the center 1c than at both wall surfaces 1a and 1b, by increasing the amount of gas supplied to the center 1c, the velocity distribution can be made uniform and coke cooling can be made uniform. However, tower body 1
Inside is a moving bed of coke, and if the coke descends at a high rate, there are limits to how the amount of cooling gas supplied can be changed. In other words, as shown in Fig. 3, the descending velocity distribution of coke in the column body 1 is
The speed is slowest at the center 1c, and the speed at the center 1c and both walls 1
If the conventional method is used to uniformly cool the coke when it is the fastest between a and 1b and there is a large difference between the maximum and minimum values, sufficient cooling gas is supplied even to the part where the descending speed is high. It is necessary to send in a large amount of cooling gas so that the cooling gas is distributed, and this requires an increase in the size of the equipment, such as increasing the size of the fan 6, which has the disadvantage of impairing economic efficiency.

These conventionally developed technologies or those currently under development have problems because they either stop coke discharge or change the amount of cooling gas supplied.

Therefore, a plurality of cutting ports 3 are provided, and a cutting valve 8 is installed at each cutting port, and each cutting valve 8 is controlled according to the temperature of the coke cut from each cutting port 3 provided with them. In this way, appropriately cooled coke can be cut out independently, so that the discharge of the entire coke does not stop. Further, since the amount of coke cut out is changed instead of changing the amount of cooling gas, there is no need to increase the size of the fan 6. Therefore, not only coke can be cooled uniformly but also economically, and the above problems can be solved.

[Problems to be Solved by the Invention] However, if the conventional method of providing a thermocouple in the cooling tower 1 is used as a coke temperature detection means,
Temperature sensing is so inaccurate that the effectiveness of controls based on it is questioned. In other words, when a thermocouple is installed inside the cooling tower body 1, the thermocouple must be buried in the brick wall of the tower to prevent wear, which makes it impossible to accurately measure the coke temperature inside the tower body 1, and The coke inside the body 1 is still in the process of being cooled and cannot be called cooled coke. Moreover, the thermocouple detects the temperature of the gas within the tower body 1 due to the influence of the gas, and the response is also slow. As described above, it is very difficult to measure the true temperature of cooled coke, and this is the reason why although it is an excellent cooling control method, its characteristics are unsatisfactory.

The purpose of the present invention is to measure the true temperature of the grain agglomerates after cooling, and to clarify which cut-out valve the measured grain agglomerates are cut out. The object of the present invention is to provide a method for determining the temperature of cut grain agglomerates in fire extinguishing equipment.

[Means and effects for solving the problems] The above object is achieved in the following manner in the present invention. That is, by operating the cutoff valves provided at each of the plurality of cutoff ports arranged in parallel at the lower part of the cooling tower, the agglomerates inside the tower are sequentially cut out from each cutout port, and each cutoff valve that sequentially cuts out the agglomerates is operated. is detected each time by a cutting sensor installed in the tower, while the surface temperature of the agglomerates that are cut out from the cutting opening, discharged outside the tower, and conveyed in a line on a belt conveyor is measured by installing a sensor outside the tower. By directly and continuously measuring the temperature using an injection-type temperature sensor and by comparing the measurement results with the above detection results, the cut-out valve from which the temperature-measured agglomerate was cut out is determined. Based on the determination, appropriate control of the corresponding cutoff valve is performed manually or automatically, thereby achieving uniform cooling of the coke.

[Example] Hereinafter, a preferred example of the present invention will be described with reference to FIG. 4.

As shown in FIG. 4, 1 is a cooling tower body, the bottom of which is provided with a cutout 3 for discharging cooled granules, that is, coke in this embodiment. A plurality of cutting ports 3 are provided, and coke can be discharged from each of the cutting ports 3a and 3b. Cutoff valves 8a and 8b are installed at each cutout port 3a and 3b,
Each cutout port 3a, by the operation of each cutoff valve 8a, 8b.
3b is designed to open and close. Each cut-off valve 8
A and 8b have a cutting sensor 1 for detecting that coke has been cut out from the cutting valve 8.
3 and 14 are provided. Further, 15 is coke discharged from the lower gate 12, and 16 is a belt conveyor for conveying the coke. A radiation temperature sensor 17 measures the temperature of the coke 15 placed on the conveyor 16 and being moved. As the temperature sensor 17, an infrared radiation thermometer that can measure the surface temperature of coke is suitable. Temperature sensor 1
7 is connected to a thermometer 19 as shown in FIG.
A temperature measurement signal is input to the thermometer 19. This thermometer 1
As the temperature indicator 9, a temperature indicator that indicates the temperature or a temperature recorder that records the temperature is suitable, and it is also desirable to have a function of displaying an alarm or recording an alarm when the temperature measurement signal is higher than a specified value. These thermometer 19 and cutting sensors 13 and 14 are electrically connected to the processing circuit 18 and input the coke temperature measurement signal and cutting signal to the processing circuit 18. The output side of the processing circuit 18 is connected to a cut-off valve display 20 and an alarm 21, and the cut-off valve display 20 is provided with a code that specifies one cut-out valve, for example, each cut-off valve by outputting an output command signal. The outlet valve number 1 assigned to the outlet valve 8 is output, and an alarm signal is output to the alarm device 21 to generate an alarm sound. Appropriate output means for the cutoff valve indicator 20 is a temperature display or a temperature recorder such as a teletypewriter. In addition, 9 is an upper bunker, and the upper gate 10 is attached so that it can be opened and closed, and 11 is a lower bunker,
A lower gate 12 is attached so as to be openable and closable.

To explain the function of the processing circuit 18, the operation order of each cut-out valve 8 is stored based on the cut-out signal. That is, each cut-off valve 8 is operated manually or automatically and is sequentially opened to cut out coke, and the cut-off valve number is stored in the order of the opened cut-off valves 8. Then, for an appropriate time, for example, the lower gate 12
A certain stored content is output to the cutoff valve display 20 from when the valve is opened until the next time the valve is opened.

Next, the operation of the apparatus shown in FIG. 4 will be described.

A radiation temperature sensor 17 is provided outside the tower body 1,
The coke is sequentially cut out from each cutoff valve 8a, 8b and falls from the lower gate 12 onto the belt conveyor 16, where the surface temperature of the coke is immediately detected continuously on the conveyor 16 as it is conveyed in a rod shape. This detected temperature is input to the thermometer 19, and the value is displayed or recorded. Since the temperature sensor 17 is installed outside the tower body 1, it is possible to measure the true temperature of the coke after cooling without any disturbance, and the installation environment is better than in the conventional case where the temperature sensor 17 is installed inside the tower body 1. It can be expected to have a long life, easy maintenance, and quick response. By the way, since the temperature of the coke conveyed in one line or in series on the conveyor 16 is measured, the cutoff valve 8a is not used as in the conventional case where the temperature of the coke flowing down in parallel was measured by being installed in the column body 1. , 8b, it is not necessary to provide as many temperature sensors 17 as there are, and therefore only one temperature sensor 17 is required. Conversely, in the case of the present invention, it is difficult to provide a plurality of temperature sensors 17 and separately measure the temperature of the coke cut out corresponding to the cutoff valves 8a and 8b. Become. For this reason, it becomes necessary to know from which cutoff valve 8a, 8b the coke placed on the conveyor 16 is cut out.

Therefore, in the present invention, as described above, each cut-off valve 8
Cut-out sensors 13 and 1 for detecting that coke has been cut out from the cut-out valves a and 8b;
4 are provided, and the cutting signals from the cutting sensors 13 and 14 are input to the processing circuit 18. Then, it is displayed or recorded on the cut-out valve display 20 which cut-out valve 8 has cut out the coke that is currently being transported on the belt conveyor 16 and whose temperature is being measured by the temperature sensor 17. I decided to do so.

In this way, the coke temperature measured by the temperature sensor 17 and the number of the cutoff valve that cut out the coke being measured are displayed or recorded at the same time, making it possible to correlate the two. I can,
The coke temperature state inside the column body 1 can be clearly grasped.

In addition, if uneven cooling of coke occurs and the temperature of the cut coke is higher than a preset value, the temperature sensor 17 detects this and displays or records an alarm on the thermometer 19. An alarm is issued from the alarm device 21 via the processing circuit 18. This alarm allows the operator to check the output of the cutoff valve indicator 20, confirm which cutout valve 8 has cut out the corresponding high temperature coke, and adjust the cutout speed (T/H) of the cutout valve 8. , or by changing the ratio of the cutting speed with other cutting valves 8, the temperature of the coke cut out from the cutting port 3 of the cooling tower body 1 is suppressed to below a specified value. It is also possible to control this cut-off valve 8 automatically. In this way, by repeating the above operation every time an alarm occurs, the coke can be uniformly cooled.

[Effects of the Invention] In summary, the present invention exhibits the following excellent effects.

(1) Since the particle agglomeration is measured outside the tower, unlike conventional methods that measure inside the tower, it is not affected by the temperature of the cooling gas, and the service life is dramatically improved. Moreover,
Since the directional temperature sensor directly measures the surface temperature of the grain agglomerates, unlike other types of sensors, it is possible to accurately measure the true temperature of the grain agglomerates after cooling. In addition, since the measurement is carried out on the grain agglomerates that are conveyed in a line on the belt conveyor, unlike measurements taken inside the tower or at the discharge port, the grain agglomerates are leveled on the belt conveyor and most of them are not buried and can be used for temperature measurement. Furthermore, since the measurement is carried out continuously, it is possible to simply and easily detect the occurrence of non-uniform cooling of the grain agglomerates.

On the other hand, the inconvenience caused when measuring outside the tower, that is, the problem of not being able to identify from which cut-out valve the measured particle agglomerate was cut out, is that the measurement result is not the result of the detection of the cut-out sensor. Since I made it correspond to the above, it is possible to solve the problem. Therefore, the corresponding cut-off valve can be accurately controlled based on this measured temperature, the cooling of the granules can be made uniform, and burnout of the belt conveyor can be effectively avoided.

(2) It is economical and has good workability because the temperature state of the granules in the cooling tower can be grasped with one temperature sensor.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing an example of a dry cooling tower for granules, Fig. 2 is a graph showing the rising speed ratio distribution of cooling gas in the cooling tower shown in Fig. 1, and Fig. 3 is a graph showing the cooling gas ratio distribution in the cooling tower shown in Fig. 1. FIG. 4 is a graph showing the descending rate ratio distribution of the grain agglomerates in the tower, and FIG. be. In addition, in the figure, 1 is a cooling tower, 3 is a cutting port, 8a,
8b is a cutting valve, 13 and 14 are cutting sensors, 15 is coke which is an example of agglomerates, 17 is a temperature sensor,
18 is a processing circuit.

Claims (1)

[Claims] 1. Operate the cut-off valves provided at the plurality of cut-off ports arranged in parallel at the bottom of the cooling tower to sequentially cut out the agglomerates inside the tower from each cut-out port. A radiation sensor installed outside the tower detects the surface temperature of the granules cut out from the cutting port, discharged outside the tower, and conveyed in a line on the belt conveyor. The cutting valve from which the temperature-measured agglomerate has been cut out is determined by directly and continuously measuring the temperature using a temperature sensor, and by correlating the measurement result with the above-mentioned detection result. A method for determining the temperature of cut-out grain agglomerates in dry fire extinguishing equipment for grain agglomerates.