JPH0324582Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a waste heat recovery method for coke dry extinguishing equipment, which allows the evaporator system of a natural circulation boiler to be used during drying and start-up of coke dry extinguishing equipment. Regarding equipment.

[Conventional technology]

Coke dry extinguishing equipment is for cooling hot red-hot coke. For this reason, refractory structures are used for cooling chambers, flues, etc. Therefore, when the refractory structure is constructed in the construction of this coke dry fire extinguishing equipment, the mortar, castable, etc. used contain a large amount of moisture. Therefore, in order to prevent damage to the refractories when starting up drying equipment, it is necessary to dry the refractories while gradually removing moisture using relatively low-temperature (150 to 180°C) hot air. Further, the need to dry while gradually removing moisture in this way also applies when the refractory is replaced during repair.

In order to perform such drying, conventionally, the waste heat recovery equipment is a forced circulation boiler, steam is blown into the steam drum, canned water is circulated by a circulation pump, the evaporator is heated, and the evaporator is heated. It functions as a heater. Heat is exchanged between the heated evaporator and the air to generate warm air (150-180°C) to dry refractories.

However, this drying method is only possible with forced circulation boilers. That is, in the case of a natural circulation boiler, there was a drawback that there was no circulation pump, the canned water could not be circulated, and the evaporator could not be used as a heater.

One way to compensate for this is to install a temporary pump in the evaporator system, but this requires additional equipment and has problems such as making the equipment expensive.

[Problems to be solved by the invention] In view of these problems in the conventional technology, the present invention solves the problem of canned water by adding a simple mechanism without requiring additional equipment such as temporary pumps. It is an object of the present invention to provide a waste heat recovery device that enables circulation, maintains the temperature of an evaporator substantially constant, and dries refractories using the heat of the heated air.

[Means for solving problems]

In order to achieve this purpose, the waste heat recovery device of the present invention includes a device for blowing steam to heat the evaporator in the steam drum, and canned water is circulated in the lower part of the riser pipe of the evaporator. It is characterized by being equipped with a steam blowing device.

By blowing steam into the lower part of this rising pipe, a difference in specific gravity is created between the canned water in the rising pipe and the descending pipe.
The can water in the evaporator tube is circulated and heated. By using this heated evaporator as a heater and letting air flow into it, the temperature of the air can be increased to 150%.
Raise the temperature to ~180℃. This heated air is used as a heat source to dry and start up the coke dry extinguishing equipment.

〔Example〕

Hereinafter, the features of the present invention will be specifically explained with reference to embodiments shown in the drawings.

The figure schematically explains the entire waste heat recovery device in this embodiment.

In the figure, 1 is a cooling chamber that cools the red-hot coke, 2 is a cooling chamber that cools the red-hot coke, and the flue through which high-temperature gas is sent out, 3 is a waste heat recovery device, and 4 is a cooling chamber 1. This is a circulation blower that sends gas to cool the red-hot coke.

Here, the waste heat recovery device 3 includes a steam drum 5, a superheater 6, an evaporator 7, an economizer 8, a downcomer pipe 9, a riser pipe 10, and a valve 1 of a device for blowing steam into the steam drum 5.
1. Consists of a valve 12 of a device for blowing steam into the riser pipe 10, etc. 14 is a steam source.

The coke dry extinguishing equipment having such a configuration is operated as follows.

When starting up drying of the coke dry extinguishing equipment, the circulation blower 4 is operated to take air into the flue through the air intake port 13 and send it to the waste heat recovery device 3. On the other hand, the waste heat recovery device 3 blows steam into the steam drum 5 and riser pipe 10 through valves 11 and 12, respectively. By blowing this steam, the canned water in the steam drum 5, downcomer pipe 9, evaporator 7, and riser pipe 10 is accompanied by the flow of steam and circulated to the steam drum 5 while being heated. do.

Under this condition, the air sucked into the waste heat recovery device 3 by the circulation blower 4 undergoes heat exchange in the evaporator 7, becomes warmed air, and is sent to the cooling chamber 1. The refractories of the chamber 1 and the flue 2 are dried.

[Effect of idea]

As explained above, in the coke dry fire extinguishing equipment of the present invention, by adding a mechanism to blow steam into the riser pipe of the evaporator so that canned water can be circulated, a forced circulation boiler is not required.
Even in the case of natural circulation boilers, the evaporator can now be used as a heater for drying and starting up coke dry extinguishing equipment. Further, the design change necessary for this purpose is limited to the addition of a steam blowing mechanism, and conventional coke dry extinguishing equipment can be used without major changes.

[Brief explanation of drawings]

FIG. 1 schematically illustrates a coke dry extinguishing system according to an embodiment of the present invention. 1: Cooling chamber, 2: Flue, 3: Waste heat recovery device, 4: Circulation blower, 5: Steam drum,
6: Superheater, 7: Evaporator, 8: Economizer, 9: Downcomer, 10: Riser pipe, 11: Valve of steam blowing device for steam drum, 12: Valve of steam blowing device for riser pipe, 13 : Air intake, 14: Steam source.

Claims (1)

[Scope of utility model registration request] A device for blowing steam to heat the evaporator of the natural circulation boiler is provided in the steam drum, and a device for blowing steam to circulate canned water is provided in the lower part of the riser pipe of the evaporator. Waste heat recovery equipment in coke dry fire extinguishing equipment.