JPH03157488A - Operation of dry fire extinguishing system for coke - Google Patents

Abstract

PURPOSE:To operate the subject equipment while preventing troubles at users of recovered steam by inputting the temperature and amount of circulating gas and the temperature of the recovered steam respectively at the inlet of a heat exchanger to a controller, carrying out calculation for prediction of the temperature of the steam due to variation of the temperature and amount of the circulating gas and controlling the temperature. CONSTITUTION:In a dry fire extinguishing system for coke where extinction is carried out by putting red-hot coke discharged from a coke oven in coke buckets 1 placed on a bucket truck, lifting the buckets to the upper part of a cooling column 3 using a lifting device 2 and charging the coke to a prechamber 4 from the upper part thereof, the temperature and amount of circulating gas and the temperature of recovered steam respectively at the inlet of a heat exchanger are input to a controller 21 of the recovered steam temperature. Calculation for prediction of the recovered steam temperature is carried out corresponding to variation of the temperature and amount of the circulating gas and the amount of valve opening of a spraying-water control valve 25 for controlling the temperature of the recovered steam is automatically controlled based on the result of the calculation, thus operating the dry fire extinguishing system for coke.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for operating a coke dry extinguishing system, in which the temperature of recovered steam can be automatically controlled to a predetermined temperature.

Conventional technology] - Red-hot coke discharged from a coke oven has traditionally been extinguished by spraying water, but the enormous amount of heat contained in red-hot coke is released into the atmosphere, and it is accompanied by water vapor generated when extinguishing by spraying water. This caused problems such as dust being scattered in the surrounding areas and causing pollution problems.

For this reason, in recent years, coke dry extinguishing equipment, which has many advantages such as being able to recover the sensible heat possessed by red-hot coke and preventing the scattering of dust, as well as improving coke strength and reducing moisture content, has been widely adopted.

In addition to the above, coke dry extinguishing equipment has the advantage of recovering and utilizing combustible gas components such as methane, hydrogen, and carbon oxides remaining in red-hot coke, and carbon monoxide generated by coke combustion. have.

On the other hand, the implementation of coke dry extinguishing equipment has the disadvantage that coke yield is reduced due to coke powdering and coke combustion.

Conventionally, coke dry extinguishing equipment has been installed in multiple lines with a processing capacity of 30 to 50 t/h per coke oven group. Recently, the processing capacity has increased to 100~200e/
Large coke dry fire extinguishing equipment is used because it is not only cheaper to construct one unit per reactor group but also easier to operate.

Figure 1 shows an example of coke dry extinguishing equipment.
Red-hot coke discharged from a coke oven (not shown) is
It is loaded onto a coke packet (1) placed on a packet truck, hoisted to the top of a cooling tower (3) by a hoist (2), and charged into a pre-chamber (4) from above.

The red hot coke put into the pre-chamber (4,) is
The lower cutting device (8) is successively lowered into the cooling chamber (5) and is cooled by direct contact with circulating gas consisting of an inert gas such as nitrogen, which is blown from the lower blast head (7) by the circulation fan (6). It is extracted by. On the other hand, the circulating gas that has reached high temperature due to contact with the red-hot coke flows through the flue (9).
After removing dust, it is introduced into a heat exchanger (10), where it is cooled by heat exchange, after which it is removed again with a cyclone (11), and is blown into a cooling chamber (5) by a circulation fan (6). The high-temperature, high-pressure recovered steam heated by heat exchange in the heat exchanger (10) is sent to a turbine generator (not shown) or the like.

In this coke dry extinguishing equipment, the amount of coke cut out is set so that the inventory level in the breech chamber (4 chambers) is maintained at a predetermined level.

On the other hand, since the unloading operation of the coke oven is carried out discontinuously, red-hot coke equivalent to the industrial kiln is charged into the pre-chamber (4) at intervals of 7 to 9 minutes during the unloading operation. However, no red hot coke is added during the kiln discharge interval (1 to 2 hours).

For this reason, the amount of coke cut out is managed so that the inventory level in the yellowtail chamber (4) reaches the upper limit level at the time of completion of the unloading operation of the coke oven.

Then, the inventory level is gradually lowered during the kiln unloading interval, that is, while coke is not being added, and the amount of coke cut is managed so that it reaches the lower limit level when the next kiln unloading operation is started. Air is introduced into the flue to combust the combustible gas mixed in the cooling tower, raising the temperature of the circulating gas, minimizing fluctuations in the amount of recovered steam, and at the same time suppressing fluctuations in the amount of coke cut from the cooling tower. ing.

However, normally, the amount of coke cut out is increased during the kiln unloading operation when red hot coke is introduced, and reduced during interruptions to maintain the amount of stock in the Brie chamber within a predetermined range. For this reason, it is inevitable that the temperature and amount of recovered steam will fluctuate during and during the unloading operation.

If the temperature of the recovered steam from this coke dry fire extinguishing equipment fluctuates, it will cause inconvenience in the subsequent use of the recovered steam, so the temperature of the recovered steam is measured and the heat exchanger is heated so that the recovered steam temperature is at the set temperature. Spray water into the tube of
The recovered steam temperature is controlled to a predetermined temperature.

However, the temperature of the recovered steam is a result of temperature measurement after heat exchange, that is, at the boiler outlet, and the control must be delayed in time. For this reason, it has been impossible to supply recovered steam at a stable predetermined temperature.

Problems to be Solved by the Invention The present invention solves the drawbacks of the operating method of the coke dry extinguishing equipment described above, and maintains the temperature of recovered steam at a predetermined temperature even when the temperature and amount of circulating gas at the inlet of the heat exchanger fluctuate. The purpose of this invention is to provide a method of operating coke dry extinguishing equipment that can be controlled in a controlled manner.

Means for Solving the Problems As a result of intensive studies on stabilizing the temperature of recovered steam in the coke dry extinguishing equipment, the inventors determined that the circulating gas temperature and amount of circulating gas at the inlet of the heat exchanger in the coke dry extinguishing equipment By predicting and calculating the temperature of the recovered steam from the current steam temperature and controlling the flow rate of spray water based on the result, the temperature of the recovered steam can be controlled in real time, stably maintaining the recovered steam at a predetermined temperature. They discovered that it could be supplied to turbine generators, etc., and arrived at this invention.

That is, the present invention provides a method for automatically operating coke dry extinguishing equipment, in which the temperature of circulating gas at the inlet of a heat exchanger, the amount of circulating gas, and the temperature of recovered steam are manually input to a recovered steam temperature control device, and fluctuations in the circulating gas temperature and amount of circulating gas are controlled. The temperature of the recovered steam is predicted and calculated in accordance with the calculated temperature, and the opening degree of the spray water control valve for controlling the temperature of the recovered steam is automatically controlled based on the calculation result.

The circulating gas temperature at the inlet of the heat exchanger in this invention can be easily measured by installing a thermocouple in the flue at the inlet of the heat exchanger. Further, the amount of circulating gas can be measured by calculating from the differential pressure between the inlet and outlet of the circulation fan, or by other known measuring methods. To measure the temperature of recovered steam, a thermocouple may be installed in the recovered steam piping of the heat exchanger.

The recovered steam temperature control device calculates the
The recovered steam temperature is predicted and calculated in response to fluctuations in the circulating gas temperature and amount, and the calculated value is compared with the set recovered steam temperature to determine the amount of water to be sprayed to the heat exchanger, thereby controlling the spray water. An opening adjustment signal is output to the valve to adjust the amount of spray water, and the temperature of the recovered steam is automatically controlled to a predetermined temperature.

Function: In coke dry extinguishing equipment, the temperature of the circulating gas at the inlet of the heat exchanger, the amount of circulating gas, and the recovered steam temperature are input to the control device, and the recovered steam temperature is predicted based on this input data. The temperature is compared with the set temperature and a valve opening adjustment signal is output to the spray water flow rate adjustment valve to control the amount of spray water, so the temperature of the recovered steam can be controlled in real time, and recovered steam at a predetermined temperature can be stably obtained. It is possible.

Embodiment FIG. 2 shows an example of the implementation of this invention, in which a temperature control device (21) for recovered steam and a thermocouple (22) installed at the inlet of a boiler (10) are connected to control the circulation gas of the boiler population. Enter temperature. In addition, it connects to the differential pressure gauges (23) installed before and after the circulation fan (6) to input the flow rate of circulating gas to the temperature control device, and connects to the thermocouple (24) installed in the recovery steam piping to collect the gas. Enter the steam temperature. The recovered steam temperature control device (21) is connected to the input boiler (10
) The temperature of the recovered steam is predicted from the circulating gas temperature at the inlet and the amount of circulating gas, and the amount of spray water is calculated by comparing the predicted temperature of the recovered steam obtained by this predictive calculation with the recovered steam temperature set in advance. The calculation is performed, and a control signal is sent to the spray water adjustment valve (25) to automatically control the opening degree of the spray water adjustment valve (25), adjust the amount of spray water, and control the recovered steam temperature to the set temperature.

Coke throughput: 195t/h, boiler capacity: 10
In a 0 t/h coke dry fire extinguishing system, the conventional method of controlling the opening of the spray water regulating valve (25) and adjusting the amount of spray water based on the temperature measurement result of the recovered steam, and the circulating gas temperature of the boiler population and the circulating The gas amount and recovered steam temperature are input to the control device (21), the recovered steam temperature is predicted and calculated, and compared with the set recovered steam temperature, the opening degree of the spray water regulating valve (25) is controlled, and the amount of spray water is adjusted. Regarding the method of this invention for adjusting the temperature, the temperature of recovered steam, the temperature of circulating gas in the boiler, and the amount of circulating gas were measured. The results are shown in FIGS. 3 and 4.

As shown in Figure 3, when using the conventional method of adjusting the amount of spray water based on the measured value of the recovered steam temperature (■), the recovered steam temperature (■) is linked to fluctuations in the circulating gas temperature (■) and the amount of circulating gas (■) in the boiler. has changed significantly.

However, as shown in Figure 4, the recovered steam temperature is predicted based on the circulating gas temperature, circulating gas amount, and recovered steam temperature of the boiler population, and the set recovered steam temperature is calculated based on the predicted recovered steam temperature. In contrast, in the case of the method of the present invention, which adjusts the amount of spray water by controlling the opening degree of the spray water regulating valve (25), even if the boiler population temperature (■) or the amount of circulating gas (■) fluctuates significantly, the recovered steam temperature (■) remains constant. The fluctuation is extremely small.

Effects of the Invention According to the method of the invention, the recovered steam temperature is predicted and calculated based on the circulating gas temperature at the inlet of the heat exchanger of the coke dry extinguishing equipment, the circulating gas amount, and the current steam temperature, and the calculated value and setting are performed. The amount of spray water to the boiler is determined by comparing it with the recovered steam temperature, and the opening degree of the spray water adjustment valve is adjusted, so the recovered steam temperature can be controlled in real time to a predetermined temperature.
Trouble can be prevented due to fluctuations in steam temperature at the place where the recovered steam is used.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of coke dry extinguishing equipment;
FIG. 2 is an explanatory diagram showing an example of implementation of the method of this invention, and FIG.
The figure is a diagram showing actual measured values of recovered steam temperature control by the conventional method, and FIG. 4 is a diagram showing actual measured values of recovered steam temperature control by the method of the present invention. 1... Coke packet 2... Winder 3.
・・Cooling tower 4・Pre-chamber 5・
・Cooling room 6... Circulation fan 7... Blast head 8... Cutting device 9... Flue
10... Boiler 11... Cyclone
2I...Temperature control device 22.24...Thermocouple 23...Differential pressure gauge 25...Spray water amount adjustment valve

Claims (1)

[Claims] 1. In the automatic operation method of coke dry extinguishing equipment, the temperature of circulating gas at the inlet of the heat exchanger, the amount of circulating gas, and the temperature of recovered steam are input to the recovered steam temperature control device, and the temperature of circulating gas and the amount of recycled gas are A method of operating a coke dry fire extinguishing equipment, comprising predicting and calculating the temperature of recovered steam, and automatically controlling the opening degree of a spray water regulating valve for controlling the temperature of recovered steam based on the calculation result.