CN100393890C

CN100393890C - Hot blast furnace with mixed burner at top part

Info

Publication number: CN100393890C
Application number: CNB2005100905495A
Authority: CN
Inventors: 黄东生; 姚朝胜; 王荣恩; 吴洪勋; 衣忠德
Original assignee: SHANGDONG DESIGN INST OF METALLURGY
Current assignee: Shandong Province Metallurgical Engineering Co Ltd
Priority date: 2005-08-17
Filing date: 2005-08-17
Publication date: 2008-06-11
Anticipated expiration: 2025-08-17
Also published as: CN1916188A

Abstract

This invention relates to a top combustion hot air stove. In this invention, a mix combustor is set on the top of the hot air stove, and is coaxial with the hot air stove vertically. The mix combustor is sealed, and divided into a coal gas chamber and an air chamber. Coal gas and air can be distributed via the coal-gas-distributing pipes and the air-distributing pipes in the two chambers, respectively. Coal gas and air can be mixed for combustion in the combustion chamber via the distributing tunnels on the inner lining of the combustion chamber. The mix combustor is solely supported by bracket on the top of the combustion chamber. The coal-gas-distributing pipes and the air-distributing pipes are coaxially arranged, and the coal-gas-distributing pipes penetrate the air chamber and the air-distributing pipes.

Description

Hot-blast stove with mixing burner on top

Technical Field

The invention relates to a top combustion type hot blast stove in the field of blast furnace hot blast stoves of metallurgical systems, in particular to a hot blast stove with a mixed burner at the top.

Background

The top combustion hot blast stove of present industrial application has different structures, its shortcoming is that the collector is located inside the precombustion chamber, it is not the penetration, the inside lining of precombustion chamber is thicker, air, the gas pore channel configuration is restricted, the structure is relatively complicated, the brick type is more, temperature stress is great to collector dividing wall and inboard vertical wall influence, arouse investment increase, a series of problems such as construction difficulty, how to improve present various top combustion hot blast stoves and break through to some extent, strengthen the mixture of air and coal gas, simplify the structure, reduce the construction difficulty, save the investment, become the problem that metallurgical worker cared about.

Disclosure of Invention

The invention aims to solve the technical problem of providing a top-combustion hot blast stove which has the advantages of simple structure, small construction difficulty, full mixing and combustion of air and coal gas, higher air temperature, reduced investment and shortened construction period. And each air flow and each gas flow entering the combustion chamber are fully mixed and combusted through the top mixing burner.

Therefore, the technical scheme adopted by the invention is as follows: a hot blast stove with a mixed burner at the top comprises a cold air inlet, a grate, a support column, a checker brick, a regenerative chamber, a furnace lining, a furnace shell, a vault combustion chamber, a mixed burner, a hot air outlet and a flue gas outlet. The mixed burner is arranged above the outer part of the arch crown combustion chamber and is coaxial with the hot blast stove in the vertical direction, the mixed burner consists of a shell, a lining, a base, an air inlet, a coal gas inlet, an air chamber, a coal gas pipe, an air pipe, a partition plate and a base heat insulation layer, the space between the shell and the base is divided into the coal gas chamber and the air chamber by the partition plate, the coal gas chamber and the air chamber are respectively provided with the coal gas inlet and the air inlet, a plurality of coal gas pipes and air pipes are distributed in the coal gas chamber and the air chamber, and the coal gas pipes and the. Wherein,

the mixing burner is independently supported above the dome combustion chamber by a support means.

The gas chamber is arranged at the upper part or the lower part of the air chamber, and the gas chamber and the air chamber are positioned in the same closed space.

The gas pipe and the air pipe are respectively distributed with a gas swirl plate and an air swirl plate.

The gas pipe passes through the air chamber and the air pipe of the air chamber or the air pipe passes through the gas chamber and the gas pipe of the gas chamber.

During the air supply period, a small amount of nitrogen gas with the pressure slightly higher than the pressure in the furnace is introduced into the air chamber and the gas chamber.

A water cooling device is arranged in the base of the mixing burner.

In summary, the basic structure of the present invention is that a mixing burner is arranged on the outside of the combustion chamber of the hot blast stove and is coaxial with the combustion chamber in the vertical direction, the mixing burner is a closed space which is divided into a gas chamber and an air chamber, the gas and the air are distributed and mixed through a gas pipe and an air pipe which are respectively arranged in the gas chamber and the air chamber, and the mixture enters the vault combustion chamber for combustion after passing through a base and an insulating layer below the base. The mixing burner is independently supported on the combustion chamber through a supporting device, the coal gas distribution pipes and the air distribution pipes are arranged concentrically, and the coal gas distribution pipes penetrate through the air chambers and the air pipes of the air chambers.

Due to the adoption of the structure, the invention has the following beneficial effects:

1. the mixing burner is positioned outside the combustion chamber of the hot blast stove and is independently supported on the arch crown combustion chamber through the supporting device, so that the construction and the installation are convenient, the integral hoisting can be realized, and the construction period is shortened.

2. The mixed burner has simple structure and simplifies the design of the top combustion hot blast stove.

3. Save refractory materials and reduce the weight of the furnace body.

4. The temperature difference between the theoretical combustion temperature of coal gas and the vault temperature of the combustion chamber is small, the heat efficiency is high, and the hot air temperature is high.

5. The investment is saved.

6. The air and the coal gas are fully mixed.

The invention is further described with reference to the following figures and detailed description.

Drawings

FIG. 1 is a basic block diagram of a top-fired stove with a hybrid burner at the top.

Fig. 2 is a cross-sectional view a-A, B-B of fig. 1.

In the figure:

1. cold air inlet 2, grate and pillar 3, smoke outlet

4. Checker brick 5, regenerator 6, furnace lining

7. Furnace shell 8, vault combustion chamber 9, mixed combustor strutting arrangement

10. Base 11, air inlet 12, gas inlet

13. Gas chamber 14. mixed burner lining 15. gas pipe

16 insulating layer 17 of partition board, 18 partition board and support, air chamber

19. Base upper insulating layer 20, air pipe 21, air swirl plate

22. Coal gas swirl sheet 23-24, base lower insulating layer 25, fiber felt

26. Hot air outlet 27. mixed burner

Detailed Description

As shown in the structural diagram of the embodiment of the invention shown in fig. 1, the top-fired hot blast stove with the mixing burner at the top comprises a cold air inlet 1, a regenerator grate and a support column 2, a flue gas outlet 3, a combustion chamber checker brick 4, a regenerator 5, a furnace lining 6, a furnace shell 7, a dome combustion chamber 8, a mixing burner support device 9, a mixing burner 27, a fiber felt 25 and a hot air outlet 26. The mixed burner 27 is composed of a base 10 (a water cooling device is arranged in the base of the mixed burner), an air inlet 11, a coal gas inlet 12, a coal gas chamber 13, a mixed burner lining 14, a coal gas pipe 15, a partition plate heat insulation layer 16, a partition plate 17, an air chamber 18, a base upper heat insulation layer 19, an air pipe 20, an air swirl plate 21, a coal gas swirl plate 22 and base lower

heat insulation layers

23 and 24.

The mixing burner 27 is positioned above the exterior of the dome combustion chamber 8 and is coaxial with the dome combustion chamber 8 in the vertical direction, and the mixing burner 27 has a mixing burner liner 14 inside and is independently supported above the dome combustion chamber 8 by a mixing burner supporting device 9.

Referring to fig. 2, which shows a cross-sectional view a-A, B-B of fig. 1, respectively, the hybrid combustor 27 is a closed space, the interior of which is divided into a gas chamber 13 and an air chamber 18 by a partition 17, the gas chamber 13 being located above or below the air chamber 18 and being located in the same closed space. A plurality of gas pipes 15 and air pipes 20 are respectively distributed in the gas chamber 13 and the air chamber 18 and are concentrically arranged, and the gas pipes 15 penetrate through the air chamber 18 and the air pipe 20 of the air chamber or the air pipe 20 penetrates through the gas chamber 13 and the gas pipes 15 of the gas chamber 13.

The gas pipe 15 and the air pipe 20 are internally provided with a rotational flow sheet, so that air and gas generate rotational flow, and the cross jet flow at the outlet is rotationally mixed and rapidly combusted.

Coal gas enters the vault combustion chamber 8 through the coal gas inlet 12, the coal gas chamber 13 and the coal gas pipe 15, air enters the vault combustion chamber 8 through the air inlet 11, the air chamber 18 and the air pipe 20, the coal gas and the air are forcibly divided into a plurality of strands of thin flows by the plurality of coal gas pipes 15 and the plurality of air pipes 20, the thin flows respectively swirl before entering the vault combustion chamber 8, cross jet flows rotate and mix when entering the vault combustion chamber 8, the mixing is complete, and the combustion temperature is high. The multiple strands of thin flows are spread in a rotating mode along the inner wall of the vault combustion chamber 8 and enter the checker bricks on the whole section of the regenerator, and air flow is distributed uniformly.

The coal gas is completely combusted after entering the arch crown combustion chamber 8 and enters the checker bricks on the whole section of the regenerator 5 at the highest temperature, so that the distance is short, the heat loss is less and the efficiency is high.

The invention may be embodied in many alternate forms and the specific embodiments illustrated in the drawings are presently preferred and are not intended to limit the scope of the invention.

Claims

1. The hot blast stove with the top provided with the mixed burner comprises a cold air inlet, a grate, a support column, a checker brick, a regenerator, a furnace lining, a furnace shell, an arch top combustion chamber, the mixed burner, a hot air outlet and a flue gas outlet.

2. The stove of claim 1, wherein the burner is independently supported above the dome combustion chamber by support means.

3. The stove of claim 1, wherein the gas chamber is above or below the air chamber and the gas chamber and the air chamber are located in the same enclosed space.

4. The hot blast stove with the mixing burner at the top as claimed in claim 3, wherein the gas swirl plate and the air swirl plate are distributed in the gas pipe and the air pipe respectively.

5. The stove according to claim 3, wherein the gas pipe passes through the air chamber and the air pipe of the air chamber or the air pipe passes through the gas chamber and the gas pipe of the gas chamber.

6. The stove according to claim 1 or 2, wherein during the blast, a small amount of nitrogen gas is introduced into the air chamber and the gas chamber at a pressure slightly higher than the pressure in the stove.

7. The stove according to claim 1 or 2, wherein the base of the burner is internally provided with water cooling means.