CN107604122B

CN107604122B - Movable smoke hood for converter waste heat boiler

Info

Publication number: CN107604122B
Application number: CN201710933169.6A
Authority: CN
Inventors: 陈艳; 陈仪佳; 何网秀
Original assignee: Suzhou Hailu Heavy Industry Co Ltd
Current assignee: Suzhou Hailu Heavy Industry Co Ltd
Priority date: 2017-10-10
Filing date: 2017-10-10
Publication date: 2023-03-17
Anticipated expiration: 2037-10-10
Also published as: CN107604122A

Abstract

The invention discloses a movable smoke hood for a converter waste heat boiler, which comprises: the heat absorption device is formed by longitudinally superposing a plurality of horizontally arranged annular heat absorption pipes, the heat absorption device is integrally in a circular truncated cone shape, the interior of each annular heat absorption pipe in the heat absorption device is divided into two sections of relatively independent heat absorption pipe sections by two partition plates welded on the inner pipe wall of the annular heat absorption pipe, each section of the annular heat absorption pipe is provided with a water inlet and a water outlet, the water inlet of each section of the annular heat absorption pipe is communicated with the water inlet header through a first branch pipe, the water outlet of each section of the heat absorption pipe in the heat absorption device is communicated with the water outlet header through a second branch pipe, and the middle part of each partition plate in each annular heat absorption pipe is provided with an exhaust hole with the diameter far smaller than that of the annular heat absorption pipe. The invention has the advantage of long service life.

Description

Movable smoke hood for converter waste heat boiler

Technical Field

The invention relates to a converter waste heat boiler, in particular to a movable smoke hood for the converter waste heat boiler.

Background

The converter waste heat boiler usually adopts a vaporization cooling flue structure to recover waste heat of coal gas, high-temperature flue gas and smoke dust during oxygen blowing and steel making of a converter of a steel enterprise, is directly linked with the production process of the converter and directly participates in steel making production as a part of the converter steel making process, can collect the high-temperature flue gas in the process of smelting steel by the converter and cool the high-temperature flue gas, meets the requirements of dust removal and coal gas recovery in the later period of steel making, can also generate a large amount of steam for the requirements of production and life, can greatly reduce the cost of production and life, and plays an important role in steel plants. The converter waste heat boiler mainly comprises a movable smoke hood, a furnace mouth fixed smoke hood, a lower section cooling flue and an upper section cooling flue. Because the operation condition of the waste heat boiler of the converter periodically and sharply changes along with the smelting process of the converter, when the converter blows, a large amount of high-temperature flue gas flows through the waste heat boiler, and the heat load of the waste heat boiler is sharply increased; when the blowing is stopped, the heat load of the waste heat boiler is drastically reduced, and such a severe operating condition inevitably affects the service life of the waste heat boiler. At present, the service life of a converter waste heat boiler is very short, the average service life of an upper section cooling flue is about 6 years, the service life of a lower section cooling flue is 2-3 years, and the service life of a movable smoke hood is only about 1 year due to worse operation conditions. The movable smoke hood is mainly used for better supplementing and collecting and dredging high-temperature smoke generated in the smelting process of the converter in cooperation with the fixed smoke hood, and simultaneously prevents external air from invading to influence the recovery quality of coal gas and prevents the smoke from escaping to worsen the workshop environment. Therefore, the design of the waste heat boiler of the converter, particularly the movable smoke hood is very important, and the waste heat boiler directly influences the normal production of the converter.

The structure of the movable smoke hood used at present is as follows: the heat absorption device is formed by longitudinally superposing a plurality of annular heat absorption pipes which are horizontally arranged and have the pipe diameters of 51mm, the heat absorption device is integrally in a circular truncated cone shape, the inside of each annular heat absorption pipe in the heat absorption device is divided into two sections of relatively independent heat absorption pipe sections by two partition plates welded on the inner pipe wall of the annular heat absorption pipe, a water inlet and a water outlet are respectively arranged on each section of the heat absorption pipe in the heat absorption device, the water inlet of each section of the heat absorption pipe in each annular heat absorption pipe in the heat absorption device is respectively communicated with the water inlet header through a first branch pipe, and the water outlet of each section of the heat absorption pipe in each annular heat absorption pipe in the heat absorption device is respectively communicated with the water outlet header through a second branch pipe. When the water-saving heat absorption collecting box works, water in the water inlet collecting box enters each heat absorption pipe section from the water inlet of each heat absorption pipe section after passing through each first branch pipe, and then enters the water outlet collecting box from the water outlet of each heat absorption pipe section through each second branch pipe. The movable smoke hood has the following disadvantages: because water mainly flows through the area between the water inlet and the water outlet in each heat absorption pipe section, the exhaust of dead water areas such as the area between the water inlet and the partition plate corresponding to the same side in the heat absorption pipe section and the area between the water outlet and the partition plate corresponding to the same side in the heat absorption pipe section is unsmooth, residual gas in water is easy to gather in the dead water areas, and the gas gathered in the dead water areas of the heat absorption pipe section can be continuously compressed and rebounded under the action of fluctuating water pressure in use, so that the heat absorption pipe wall and the partition plate of the dead water areas are continuously impacted, the welding seams between the annular heat absorption pipe and the partition plates are pulled to crack, the water leakage of the annular heat absorption pipe is caused, and the service life of the movable smoke hood is short; and once the annular heat absorption pipe leaks, the steel plant is forced to shut down the furnace for renovation, the service life of the current movable smoke hood is only about half a year, the furnace needs to be shut down twice per month on average to repair the movable smoke hood, the repair welding time is about 6 hours each time, the production progress is greatly influenced, and the danger of repair work is increased.

Disclosure of Invention

The invention aims to provide a movable smoke hood for a converter waste heat boiler, which has long service life.

In order to achieve the purpose, the invention adopts the following technical scheme: converter waste heat boiler be with activity petticoat pipe, include: the heat absorption device is formed by longitudinally superposing a plurality of horizontally arranged annular heat absorption pipes, the heat absorption device is integrally in a circular truncated cone shape, the inside of each annular heat absorption pipe in the heat absorption device is divided into two sections of relatively independent heat absorption pipe sections by two clapboards welded on the inner pipe wall of the annular heat absorption pipe, each section of the heat absorption pipe in the heat absorption device is respectively provided with a water inlet and a water outlet, the water inlet of each section of the heat absorption pipe in the heat absorption device is respectively communicated with the water inlet header through a first branch pipe, the water outlet of each section of the heat absorption pipe in the heat absorption device is respectively communicated with the water outlet header through a second branch pipe, and the middle part of each clapboard in each annular heat absorption pipe is respectively provided with a heat absorption hole with the diameter far smaller than that of the annular pipe.

Further, aforementioned converter exhaust-heat boiler is with activity petticoat pipe, wherein: the aperture of the exhaust hole is 2-3 mm.

Further, aforementioned converter exhaust-heat boiler is with activity petticoat pipe, wherein: the two side surfaces of each partition plate in each annular heat absorption pipe are both in the shape of an inwards concave arc.

Through the implementation of the technical scheme, the invention has the beneficial effects that: the middle part of each partition plate in each annular heat absorption pipe is respectively provided with an exhaust hole with the aperture of 2-3 mm, and the surfaces of the two sides of each partition plate are arranged into the concave arc shape, so that the exhaust of dead water areas such as the area between a water inlet in the heat absorption pipe section and the partition plate corresponding to the same side and the area between a water outlet in the heat absorption pipe section and the partition plate corresponding to the same side can be smooth, the impact of residual gas in water on the inner pipe wall of the annular heat absorption pipe and the partition plate can be greatly reduced, the occurrence of tensile fracture of a welding seam between the annular heat absorption pipe and the partition plate can be greatly reduced, the water leakage phenomenon of the annular heat absorption pipe can be effectively reduced, the service life of the movable smoke hood can be greatly prolonged, the service life of the movable smoke hood can be two to three years, the welding repair of the movable smoke hood can be avoided every month, and the labor intensity of workers can be reduced.

Drawings

Fig. 1 is a schematic structural diagram of a movable hood for a converter waste heat boiler according to the present invention.

Fig. 2 is a schematic view of the structure in the top view of fig. 1.

Fig. 3 is an enlarged schematic view of a portion H shown in fig. 2.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

As shown in fig. 1, 2 and 3, the movable hood for the converter waste heat boiler comprises: the heat absorption device is arranged between the water inlet header 1 and the water outlet header 2, the heat absorption device is formed by longitudinally superposing a plurality of annular heat absorption pipes 3 which are horizontally arranged, the heat absorption device is integrally in a circular table shape, the interior of each annular heat absorption pipe 3 in the heat absorption device is divided into two sections of relatively independent heat absorption pipe sections by two partition plates 4 which are welded on the inner pipe wall of the annular heat absorption pipe 3, each section of the heat absorption pipe 3 in the heat absorption device is respectively provided with a water inlet and a water outlet, the water inlet of each section of the heat absorption pipe 3 in the heat absorption device is respectively communicated with the water inlet header 1 through a first branch pipe 5, the water outlet of each section of the heat absorption pipe section of each annular heat absorption pipe 3 in the heat absorption device is respectively communicated with the water outlet header 2 through a second branch pipe 6, the middle part of each partition plate 4 in each annular heat absorption pipe 3 is respectively provided with an exhaust hole 7 with the aperture far smaller than the pipe diameter of the annular heat absorption pipe 3, the exhaust holes 7 can enable the exhaust of dead water areas such as the area between the water inlet in the heat absorption pipe section and the partition plate corresponding to the same side and the area between the water outlet in the heat absorption pipe section and the partition plate corresponding to the same side to be smooth, the impact of residual gas in water on the inner pipe wall and the partition plate of the annular heat absorption pipe can be reduced, the occurrence of the tensile fracture of a welding seam between the annular heat absorption pipe and the partition plate can be reduced, the water leakage phenomenon of the annular heat absorption pipe can be effectively reduced, and the service life of the movable smoke hood can be greatly prolonged; in the embodiment, the aperture of the exhaust hole 7 is 2-3 mm; in this embodiment, the two side surfaces of each partition plate 4 in each annular heat absorption pipe 3 are both in the shape of an inward concave arc, so that the impact of residual gas in water on the inner pipe wall of each annular heat absorption pipe and the partition plate can be further dispersed, the occurrence of the situation that a welding line between each annular heat absorption pipe and each partition plate is broken is further reduced, the occurrence of the water leakage phenomenon of each annular heat absorption pipe is further reduced, and the service life of the movable smoke hood is further prolonged.

The invention has the advantages that: the middle part of each partition plate in each annular heat absorption pipe is respectively provided with an exhaust hole with the aperture of 2-3 mm, and the surfaces of the two sides of each partition plate are arranged into the concave arc shape, so that the exhaust of dead water areas such as the area between a water inlet in the heat absorption pipe section and the partition plate corresponding to the same side and the area between a water outlet in the heat absorption pipe section and the partition plate corresponding to the same side can be smooth, the impact of residual gas in water on the inner pipe wall of the annular heat absorption pipe and the partition plate can be greatly reduced, the occurrence of tensile fracture of a welding seam between the annular heat absorption pipe and the partition plate can be greatly reduced, the water leakage phenomenon of the annular heat absorption pipe can be effectively reduced, the service life of the movable smoke hood can be greatly prolonged, the service life of the movable smoke hood can be two to three years, the welding repair of the movable smoke hood can be avoided every month, and the labor intensity of workers can be reduced.

Claims

1. Converter waste heat is movable petticoat pipe for boiler includes: the heat absorption device is formed by longitudinally superposing a plurality of horizontally placed annular heat absorption pipes, the heat absorption device is integrally in a circular truncated cone shape, the inside of each annular heat absorption pipe in the heat absorption device is divided into two sections of relatively independent heat absorption pipe sections by two clapboards welded on the inner pipe wall of the annular heat absorption pipe, each section of the heat absorption pipe in the heat absorption device is provided with a water inlet and a water outlet, the water inlet of each section of the heat absorption pipe in the heat absorption device is communicated with the water inlet header through a first branch pipe, and the water outlet of each section of the heat absorption pipe in the heat absorption device is communicated with the water outlet header through a second branch pipe, and the heat absorption device is characterized in that: the middle part of each partition plate in each annular heat absorption pipe is respectively provided with an exhaust hole with the aperture far smaller than the pipe diameter of the annular heat absorption pipe, the aperture of the exhaust hole is 2-3 mm, and the surfaces of the two sides of each partition plate in each annular heat absorption pipe are both in the shape of an inwards concave arc.