JPH0446992A - High-load operation of coke dry quenching facility - Google Patents

Abstract

PURPOSE:To carry out efficiently the operation near the upper limit of a high-load operation of the title facility by controlling the amount of air introduced into the flue section of a cooling chamber, according to the temperature of recycle gas at the inlet of a boiler, and further controlling the amount of coke removed based on specific conditions. CONSTITUTION:In the operation of a coke dry quenching facility, the amount of air introduced into the flue section 15 of a cooling chamber 4 is controlled by an air control valve 10 according to the temperature of recycle gas 7 at the inlet of a boiler 8, and the amount of coke removed is controlled based on the temperature of the recycle gas 7 at the inlet of the boiler 8, the concentration of combustible gas in the recycle gas 7, the amount and temperature of the coke removed, the amount of coke charged and the inventory of coke in the chamber 4. Further, the temperature of the recycle gas 7 at the inlet of the boiler 8, the concentration of combustible gas in the recycle gas and the temperature of the coke removed are controlled so that a high-load operation of the coke dry quenching facility is achieved. According to the above process, it is possible to utilize heat sources effectively and to avoid the reduction in recycle gas amount and explosion due to the increase in combustible gas concentration. It is further possible to realize an increase in steam recovery and the protection of the facility.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for operating a boiler of a coke dry extinguishing installation under high load.

Conventional technology] - Coke dry extinguishing equipment can extinguish red-hot coke discharged from a coke oven without generating dust, and also recovers the sensible heat possessed by red-hot coke and converts it into steam energy in a boiler for effective use. Because of this, it has been widely adopted in recent years.

In order to utilize this boiler efficiently, various proposals have been made regarding operating methods of coke dry fire extinguishing equipment.

For example, a method has been proposed in which the unloading schedule and performance of a coke oven, the amount of coke in stock in a prechamber, and the coke discharge temperature are input into a computer, and the amount of coke cut is calculated and set (Japanese Patent Publication No. 80-33150, No. 82-238887).

However, although there is a large relationship between the amount of coke cut out and the temperature of the circulating gas, these methods do not take this into account, so the temperature of the circulating gas may reach the upper limit, especially during high-load operation of coke dry extinguishing equipment. If it gets too close, it is thought that efficient operations will become difficult.

Furthermore, in order to control the combustible gas concentration, a control method has been proposed in which the amount of air introduced and the amount of combustible gas released are changed according to the concentration. (Unexamined Japanese Patent Publication No. 10302/1983, Unexamined Japanese Patent Publication No. 81/1983)
No. 188890, Japanese Unexamined Patent Publication No. 1983-10f390).

However, when controlling the combustible gas concentration in the circulating gas by adjusting the amount of combustible gas burned by introducing air as in the conventional combustible gas concentration control method, the temperature of the circulating gas increases as the amount of combustible gas burned increases. In particular, during high-load operation of coke dry extinguishing equipment, there are cases where control is impossible due to equipment constraints. Furthermore, when controlling the concentration of combustible gas by adjusting the amount of combustible gas released from the upper part of the prechamber, it is not possible to effectively utilize combustible gas, which is an important heat source in coke dry extinguishing equipment.

Problems to be Solved by the Invention The present invention solves the above-mentioned problems by effectively operating near the upper limit during high-load operation, and by effectively recovering combustible gas as a heat source. In order to make it possible, if the combustible gas concentration increases - temporarily reduce the coke output and reduce the circulating gas temperature at the boiler inlet, and at the same time automatically increase the air intake and combust the combustible gas. As a result, it is possible to reduce the combustible gas concentration while keeping the circulating gas temperature at the boiler inlet almost constant.

Means for Solving the Problems The present invention, in the operation of coke dry extinguishing equipment, controls the amount of air introduced into the flue section of the cooling chamber according to the circulating gas temperature at the boiler inlet, and also controls the circulating gas temperature at the boiler inlet and the circulating gas temperature at the boiler inlet. The amount of coke cut is controlled based on the combustible gas concentration in the gas, the amount and temperature of coke cut, the amount of coke charged and the amount of coke stock in the chamber, and the amount of coke cut is controlled based on the circulating gas temperature at the boiler inlet and the combustible gas in the circulating gas. This is a high-load operating method for coke dry digestion equipment, characterized by controlling the concentration and coke cutting temperature.

action The present invention will be explained below based on the drawings.

As shown in FIG. 1, the coke dry extinguishing equipment includes a prechamber 3 having a charging port 2 at the top of a cooling tower l, a cooling chamber 4 at the center, a circulating gas inlet 5 at the bottom, and a coke cutting device i6. The circulating gas 7 is discharged from the flue 15 arranged annularly at the upper end of the cooling chamber 4 and introduced into the boiler 8, where the sensible heat held by the red-hot coke is converted into steam 9 and recovered. .

Since recovered natural air is used industrially as a heat source in factories, for power generation, etc., high-load operation in which the amount of steam generation is approximately constant within a set range is desired. For this purpose, it is desirable that the temperature of the circulating gas 7 at the boiler inlet is almost constant to the target and does not fluctuate.

The present invention controls the amount of air introduced and the amount of coke cut out based on a control image as shown in FIG.

First, the amount of air introduced into the flue 15 is controlled so that the air introduced from the air introduction amount control valve 10 burns the combustible gas in the circulating gas 7. Based on this, the opening degree of the valve 10 is automatically controlled, and the boiler log gas temperature is controlled to the target value.

Next, the amount of coke cut out is controlled by the amount of coke in the chamber that is calculated from the unloading schedule and the unloading results that have been input and accumulated in the coke oven combustion management computer 11, and the amount of coke charged to the dihinper and the amount of coke discharged. Using the coke inventory amount, the coke dry extinguishing equipment automatic operation control computer 12 simulates the coke inventory amount within chaff/<-, and the coke is cut out so that the inventory amount fluctuates within the set upper and lower limits of the inventory amount. Calculate quantities.

If the combustible gas concentration in the circulating gas measured online is below the set upper limit concentration, coke is cut out using the cutting amount calculated using the above method.The combustible gas concentration is above the upper limit concentration and the circulating gas temperature at the boiler inlet is the upper limit. In the case of a value, the calculated cutting amount is reduced by a certain amount W for a certain time t.

In this case, optimal values for the cutting time t and cutting weight W are calculated and set by the computer 12 according to the combustible gas concentration, but the amount of combustible gas is controlled and the influence on the coke inventory amount is minimized. In order to reduce the cutting time t,
It is desirable that the cut-out weight loss W is about 0 to 100 T/H.

As a result, the amount of sensible heat of coke recovered by circulating gas decreases, and accordingly, by controlling the amount of coke cut out, the amount of air introduced automatically increases, increasing the amount of combustible gas combustion.
The combustible gas concentration can be reduced while keeping the circulating gas temperature at the boiler inlet constant.

Further, when the coke cutting temperature 13 exceeds the set value, the discharge amount is reduced by a certain amount for a certain period of time, and the unit air volume is significantly increased for a short period of time to lower the coke temperature, similarly to the combustible gas concentration control. Even in this case, the amount of air introduced will automatically increase as the circulating gas temperature at the boiler inlet decreases.

It becomes possible to lower the cut coke temperature while keeping the circulating gas temperature at the boiler inlet constant.

Effects of the Invention According to the present invention, by burning and controlling combustible gas, it is possible to effectively utilize a heat source and avoid a decrease in the amount of circulating gas or an explosion due to an increase in the concentration of combustible gas. Additionally, by stabilizing the circulating gas temperature at the boiler inlet, it is possible to increase the amount of recovered steam and protect equipment. Furthermore, the operating load on the operator can be reduced.

[Brief explanation of drawings]

FIG. 1 is a process diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a control aspect of the present invention. 1--Cooling tower, 2-Charging port, 3-Pre-chamber 14-Cooling chamber, 5-φ Circulating gas inlet, 6-φ Coke cutting device, 7-Circulating Gas, 8... Boiler 9, steam, 10... Air introduction amount control valve, 11... Computer for coke oven combustion control, 12... Computer for automatic operation control of coke dry fire extinguishing equipment, 13... ... Coke cutting temperature, 14--Coke cutting amount control device, 15--Flue, ]6 fist... Circulating gas temperature measuring device.

Claims (1)

[Claims] In the operation of coke dry extinguishing equipment, the amount of air introduced into the flue section of the cooling chamber is controlled according to the circulating gas temperature at the boiler inlet, the circulating gas temperature at the boiler inlet, the combustible gas concentration in the circulating gas, and the amount of coke cut out. and controlling the coke cutting amount based on the cutting temperature, coke charging amount, and coke inventory amount in the chamber, and controlling the circulating gas temperature at the boiler inlet, the combustible gas concentration in the circulating gas, and the coke cutting temperature. High-load operating method of coke dry extinguishing equipment.