JPS6044582A - Method for cleaning heat transfer surface of boiler in dry quenching apparatus of coke - Google Patents

Abstract

PURPOSE:To prevent the lowering of the heat transfer of a boiler, and to enable the size-reduction of the boiler, by increasing the pressure of a part of the circulation gas for quenching coke, and blasting the gas toward the heat transfer surface of the boiler, thereby removing the deposited material from the surface. CONSTITUTION:The hot circulation gas generated by cooling red-hot coke in the coke-quenching apparatus 1 is passed through the first dust precipitator 2 and cooled in the waste-heat recovery boiler 3. The cooled circulation gas is sent again to the coke-quenching apparatus 1 with the circulation fan 5, and a part of the gas circulating to the quenching apparatus 1 is compressed with a by-pass compressor 13, transferred through the pipe 14 to the boiler 3, and blasted through the nozzle 15 toward the surface of the heat transfer tubes 17, 18 of the boiler 3 to remove the deposited material from the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a boiler heat transfer surface cleaning method that can be advantageously used in coke dry cooling equipment formed by a circulating gas path.

Prior Art Generally, the gas circulating through a coke dry cooling system is used to waste heat through a dust removal device. Although fine dust is introduced into the goira, it is not removed and adheres to the heat transfer surface (for example, the outer peripheral surface of a heat exchanger tube) inside the brittle goira, impairing heat transfer efficiency.

As a countermeasure, we increased the spacing between the heat exchanger tubes to improve the flow of circulating gas, but the adhesion of fine dust could not be avoided.
During periodic repairs, debris was removed manually. Therefore, the boiler itself has become larger and has the drawback of going against labor-saving measures. Another countermeasure is to blow steam onto the heat transfer surface, but this is undesirable as it changes the composition of the inert gas and creates a corrosive environment.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a waste heat recovery boiler which is compact and whose heat transfer performance is not degraded by deposits on the heat transfer surface.

Structure and operation of the invention The present invention is directed to a coke dry cooling system in which a coke cooling device, a dust removal device, a waste heat recovery boiler, and a circulation fan are connected through conduits to form a circulation path for circulating gas. Is it possible to boost some of the pressure? This is a method for cleaning a boiler heat transfer surface in a coke dry cooling facility, which is characterized by spraying onto the heat transfer surface in the boiler to remove deposits.

The method of the present invention will be explained in detail below based on Examples.

Embodiment One embodiment of the present invention will be described in detail with reference to the drawings.O Red-hot coke is charged from the top of the coke cooling device 1. Conversely, the gas for cooling the coke is introduced from the lower part of the cooling device 1, absorbs heat from the coke, and is piled up from the upper part.

The circulating gas heated by the coke cooling device 1 is transferred to the waste heat recovery boiler 3 via the primary dust removal device 2 provided for boiler protection.
8, it is cooled by heat exchange with water. The cooled circulating gas is sent to the coke cooling device again by the circulation fan 5 via the secondary dust removing device 4 provided to protect the circulation fan 5.

Waste heat recovery, which is the route for the above circulating gas? A part of the circulating gas is passed through the inlet 3 or from the route circulating to the coke cooling device 1 and is transferred to the bihas n-pressure machine 13 as a high-pressure working fluid through the conduit 14 to the boiler and blown onto the heat exchanger tube surface by the blowing device 15. Removes deposits by attaching it.

Effects of the invention Boiler heat transfer performance can be effectively maintained without affecting the gas properties during circulation. This makes it possible to reduce the fin spacing of the heat exchanger tube with fins, making the boiler more compact.

[Brief explanation of the drawing]

The drawings are diagrams showing an example of an embodiment of the present invention. 1... Coke cooling device 2... Primary dust removal device 3.
...Waste heat recovery boiler 4...Secondary dust removal device 5...Circulating gas fan

Claims (1)

[Claims] In coke dry cooling equipment, which includes a coke cooling device, a dust removal device, and a high heat recovery system, and a circulation fan connected through a conduit to form a circulation path for circulating gas, a part of the circulating gas is pressurized and transferred to the boiler. A method for cleaning boiler heat transfer surfaces in coke dry cooling equipment that involves spraying onto hot surfaces to remove deposits.