JPS5835636B2 - How to measure the furnace temperature of a coke oven - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method for measuring the oven temperature of a coke oven, and aims to more accurately grasp the carbonization status in the coking chamber and to speed up the accuracy and speed of oven temperature control. be.

In general, large industrial coke ovens are composed of a large number of adjacent coking chambers and a row of combustion chambers, and the row of combustion chambers usually consists of 20 to 30 combustion chambers (pots).

This combustion chamber usually receives fuel and air from the bottom of the furnace, and
The structure is such that combustion is performed using staged or multistage vertical burners, but during operation, there is a temperature gradient in the height direction of the combustion chamber, which tends to delay the progress of carbonization in the upper part of the carbonization chamber.

In order to prevent this, attempts have been made to change the thickness of the partition wall between the carbonization chamber and the combustion chamber, but satisfactory results have not been obtained, and low-load operation (lowering the furnace temperature and extending the carbonization time) has been implemented. In this case, this tendency becomes noticeable.

Therefore, it is necessary to control the carbonization situation in the upper part of the carbonization chamber.

On the other hand, the carbonization situation in the carbonization chamber is controlled by the furnace temperature.

Therefore, by measuring this furnace temperature, it is possible to grasp the carbonization situation inside the carbonization chamber.

As a method for measuring the furnace temperature of a coke oven, for example, there is a method in which the temperature of the bottom brick of the combustion chamber is measured with an optical pyrometer or the like at a certain time during the carbonization process, and the temperature is determined as the furnace temperature.

However, as shown in Figure 3, when the combustion conditions per unit time in the combustion chamber change, even if the input energy remains the same, the temperature of the bottom brick of the combustion chamber changes due to the calorie of the fuel gas, the burner structure, etc. changes.

For this reason, there is no unambiguous relationship between the temperature of the bottom brick of the combustion chamber and the carbonization situation in the carbonization chamber, and the only way to do so is to find an empirical relationship for each furnace.

Another method for measuring the furnace temperature is to measure the temperature inside a refractory such as a brick at the top of a partition wall or hairpin between adjacent combustion chambers in a row of combustion chambers.

However, in this method, the physical characteristics of the temperature at the measurement position are unclear, and therefore there is no unambiguous relationship between the carbonization situation in the carbonization chamber and the temperature at the measurement position.

In other words, what corresponds to the carbonization situation in the carbonization chamber is the combustion chamber g4h wall temperature of the carbonization chamber, and the relationship between this temperature and the hairpin brick temperature varies depending on the furnace structure, burner shape, etc. As with the furnace temperature measurement method described above, the relationship between the carbonization situation in the carbonization chamber and the furnace temperature had to be determined empirically.

In addition to the furnace temperature measurement method described above, there is a method of measuring the atmospheric temperature at the hairpin section of the combustion chamber, but in this method, the direction of the smoke at the top of the hairpin is partitioned by bricks on the combustion chamber wall, so the exhaust gas temperature cannot be measured. It is thought that there is a change in the amount of exhaust gas, which is affected by changes in the amount of exhaust gas.

Therefore, since it is unclear how the atmospheric temperature in the hairpin section of the combustion chamber corresponds to the carbonization situation in the carbonization chamber, this method lacks reliability as a furnace temperature measuring method.

In this way, in both methods, the measurement of the furnace temperature that controls the carbonization situation in the carbonization chamber is indirect, so if the carbonization rate of the coal seam changes due to changes in external conditions such as input coal moisture and weight,
There was a considerable time delay for the carbonization rate to be reflected in the furnace temperature, and it was not possible to adequately control the furnace temperature with high precision in the coke oven.

This invention provides a coke oven furnace temperature measurement method that can uniformly determine the relationship between the carbonization status in the carbonization chamber and the furnace temperature, which has been previously determined empirically. This paper proposes a method that can be used to measure

In a coke oven under normal operating conditions, as shown in Fig. 1, the top surface of the coke layer 3 that has been carbonized and carbonized in the carbonization chamber 1 differs slightly depending on the type, amount of carbonization, etc.
It is about several hundred millimeters above the flue hair pin top 4.

Since the layer of about 300 to 500 mm in the upper part of this carbonized coke is affected by the upper space of the carbonization chamber 1, the part where the carbonization situation actually needs to be controlled is the space 1 m below the lower end of the hairpin top.

The temperature governing the carbonization situation at this location is generally the combustion chamber side wall temperature of the carbonization chamber corresponding to that level,
In turn, this is the temperature of the side wall of the carbonization chamber of the combustion chamber 2.

As shown in FIG. 4, this combustion chamber side wall temperature almost corresponds to the combustion chamber ambient temperature measured by an electrothermal couple.

In view of this fact, the present invention attempts to measure the furnace temperature that controls the carbonization situation in the upper part of the coal chamber, where carbonization is delayed the most in the height direction of the carbonization chamber, by measuring the combustion chamber atmosphere temperature under the top of the hei pin. be.

That is, the present invention is to measure the combustion chamber atmosphere temperature at a distance of 0 to 1000 mm below the bottom pin top of the combustion chamber in the combustion chamber row using a thermometer in a coke oven having a large number of adjacent carbonization chambers and combustion chamber rows. It is characterized by:

The reason why the side temperature position measured by a thermometer such as a thermocouple in this invention is limited to a range of 1 m below the lower end of the hairpin top is as described above.

In other words, the upper limit of the optimal temperature measurement position is limited by the furnace structure (position of the hairpin top, presence or absence of auxiliary flame path, etc.), the amount of charged coal, the volatile content of the charged coal, etc., and the lower limit is limited by the temperature of the side wall of the combustion chamber. Although it is determined by the pattern etc., taking into consideration the lifespan of the thermometer used as the temperature detecting device, the most suitable temperature measuring position is within the range of 1-rrL from the top of the flue hair pin below.

Since the temperature in the range 1 m below the lower end of the hairpin top corresponds to the carbonization chamber wall temperature as described above, the measured furnace temperature reflects the carbonization situation inside the carbonization chamber.

Therefore, according to the present invention, the progress of carbonization in the carbonization chamber can be quickly and accurately grasped, and the furnace temperature can be smoothly controlled.

A specific embodiment of this invention is shown in FIG.

Figure 2 shows an example of inserting a thermocouple 5 when using it as a thermometer. A thermocouple 5 is inserted through the peephole 6 of the combustion chamber 2.

FIG. 5 illustrates the relationship between the furnace temperature measured by the thermocouple and the carbonization completion time at the center of the carbonization chamber (the fire-off time when the temperature at the center of the carbonization chamber reaches 950'C).

The figure also shows the relationship between wall temperature and carbonization completion time determined by multiple recovery.

From this chart, it can be seen that the measured data and the calculated values almost match.

Further, the variation σ of the actually measured data when this calculation result is used as a standard is 20 minutes, demonstrating the validity of this inventive method.

As another embodiment of the present invention, the combustion temperature is measured by measuring the combustion chamber atmosphere temperature 1 m below the lower end of the hairpin top of the corresponding combustion chamber in the combustion chamber row, and averaging the measured values locally. The method is to measure the combustion chamber atmosphere temperature 1 m below the lower end of the hairpin top of the corresponding combustion chamber at a representative position in the furnace length direction within the combustion chamber row, average the measured values locally, and then A method that accurately measures the combustion temperature by averaging it locally in the longitudinal direction can be used.

As explained above (according to the present invention, the temperature that governs the carbonization situation in the upper part of the coking chamber can be measured, so the carbonization situation in the coke oven can be easily and accurately managed, stabilizing the operation, Uniform coke quality can be expected.

[Brief explanation of drawings]

Figure 1 is a partial longitudinal cross-sectional view of a coke oven, Figure 2 is a conceptual diagram of a coke oven, Figure 3 is a chart showing the relationship between the average temperature at the bottom of the flue and the average fire-down time in the oven, and Figure 4 is FIG. 5 is a chart showing the relationship between the flue wall temperature and the flue atmosphere temperature in the same manner as above, and FIG. 5 is a chart showing the relationship between the furnace temperature and fire-off time in an embodiment of the present invention. In the figure 1...--carbonization chamber, 2... combustion chamber, 3...
... Coke layer, 4 ... Hairpin top, 5 ... Thermocouple, 6 ... Peephole.

Claims (1)

[Claims] 1. A coke oven having a large number of adjacent carbonization chambers and rows of combustion chambers, characterized in that the atmospheric temperature of the combustion chamber is measured 1 m below the lower end of the hairpin top of the combustion chamber in the row of combustion chambers. Furnace temperature measurement method.