CN201387018Y - Water-cooled high temperature furnace flue pipe - Google Patents

Abstract

A water-cooled high temperature furnace flue gas pipe is characterized by having circular section and being formed by adopting carbon steel seamless steel pipes with minor diameters which surround the circumference, wherein the carbon steel seamless steel pipes with minor diameters are continuously welded with one another through fins. The water-cooled high temperature furnace flue gas pipe has large heat transfer area at unit length, long service life, high loading capacity and stable operation, and can adjust the flue gas temperature, reduce heat loss, improve the economic benefit, and reduce the initial investment to only half of the original initial investment simultaneously.

Description

Water-cooled high temperature furnace flue pipe

technical field

The utility model belongs to the technical field of boiler and smoke duct design, in particular to a water-cooled high-temperature furnace smoke duct.

Background technique

In the fan pulverizer direct-blown pulverization system of the lignite boiler power plant, the high-temperature furnace flue pipe from the lignite boiler exhaust port to the fan pulverizer inlet has a temperature of the conveying medium as high as 1100°C. The current high-temperature furnace flue pipe design , Manufacturing has two forms. The first is the internal heat preservation form, that is, the high-temperature furnace flue pipe is welded with ordinary carbon steel plates, and the interior is built with refractory bricks or lined with heat preservation materials and wear-resistant refractory materials. During the start-up and stop-up process of boilers and coal mills, the temperature of high-temperature furnace fumes changes sharply between 20 and 1100 °C. Due to the poor thermal compensation ability of the insulation structure of the pipeline itself, the refractory bricks or insulation materials and wear-resistant refractory materials will loosen after running for a period of time, resulting in shedding, and then the carbon steel pipe wall is directly in contact with the high-temperature flue gas, causing the pipeline to be damaged. Can not withstand the high temperature and burn out, serious air leakage, resulting in insufficient drying output of the coal mill, increased heat dissipation loss, and reduced operating economy. In addition, because the insulation and fixing nails fall into the coal mill, the impeller and strike plate of the coal mill are also damaged, resulting in shutdown of the furnace and shutdown, which increases the maintenance workload, maintenance cost and danger. The second is the form of external insulation, that is, the high-temperature furnace flue pipe is made of high-temperature-resistant alloy steel pipes, and the heat-resistant insulation materials are outsourced. In the process of starting and stopping of boilers and coal mills, due to the influence of drastic temperature changes in the upper mixing chamber of the pipeline, coupled with the reasons of processing and manufacturing, cracking of the pipe wall often occurs. In the actual operation process, some pipelines have long cracks, and the pipe part of the support hanger is welded. In severe cases, the pipeline is partially broken, and the pipeline even sinks, resulting in shutdown of the furnace and shutdown.

To sum up the above two forms, the current high temperature furnace flue pipe design is difficult, the investment is large, the operating conditions are harsh, and the maintenance workload is heavy.

Utility model content

The technical problem to be solved by the utility model is to provide a water-cooled high-temperature furnace flue pipe to solve the problems of extremely poor thermal compensation ability and falling off of the heat preservation layer in the form of internal heat preservation, and to solve the problem of pipe cracking and low price in the form of external heat preservation. expensive issues.

In order to solve the above technical problems, the utility model provides a water-cooled high-temperature furnace flue pipe, which is characterized in that: the pipe is a circular cross-section, and the pipe is made of carbon steel small-diameter seamless steel pipe surrounding the circumference, and the carbon steel small-diameter seamless steel pipe The spaces are continuously welded by ribs.

The utility model has a large heat transfer area per unit length, long service life, adjustable flue gas temperature, high pressure bearing capacity, and stable operation. At the same time, it can reduce heat loss, improve economic benefits, and the initial investment is only half of the original. about.

Description of drawings

Accompanying drawing is the structural representation of the utility model.

Detailed ways

Referring to the accompanying drawings, the flue pipe of the water-cooled high-temperature furnace is a circular cross-section, and each fan coal mill corresponds to a pipe, and the cross-sectional area is determined through combustion heat calculation according to the specific conditions of the project. The outer wall of the pipeline is made of carbon steel small-diameter seamless steel pipes 1 that surround the circumference, and the steel pipes are connected by continuous welding with fins 2 (carbon steel plates).

The high-temperature furnace smoke in the boiler furnace is extracted from the smoke outlet, and enters the fan coal mill downward through the high-temperature furnace smoke pipe; the low-temperature water medium enters the small-diameter seamless steel pipe on the outer wall of the high-temperature furnace smoke pipe from the lower part, and rises along the steel pipe. Radiation heat exchange is used to cool the high-temperature furnace smoke in the pipeline and heat the water medium on the outer wall at the same time.

Claims (1)

1, a kind of water-cooled high temperature boiler flue gas tube road, it is characterized in that: pipeline is a circular cross-section, pipeline adopt carbon steel path seamless steel pipe along circumferential ring around forming, between the carbon steel path seamless steel pipe by the fin continuous welding.

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