CN216639556U

CN216639556U - Low-nitrogen efficient explosion-proof high-air-temperature long-life top-combustion hot blast stove

Info

Publication number: CN216639556U
Application number: CN202220099683.0U
Authority: CN
Inventors: 吕艳玲; 马茜; 程树森; 刘力铭; 范剑超; 崔方辉; 艾会霞; 曹霞; 郝大伟; 刘璐; 陈灵
Original assignee: Zhengzhou Yuxing Hot Blast Stove Technology Co ltd
Current assignee: Zhengzhou Yuxing Hot Blast Stove Technology Co ltd
Priority date: 2022-01-15
Filing date: 2022-01-15
Publication date: 2022-05-31
Anticipated expiration: 2032-01-15

Abstract

A low-nitrogen high-efficiency explosion-proof high-air-temperature long-life top-burning hot blast stove effectively solves the problems of improving energy conservation, increasing production, increasing efficiency, reducing coke ratio and having safety and long life, a wall body of a burner is formed by pouring high-temperature-resistant scouring-resistant explosion-proof castable, a hot air outlet pipe communicated with a combustion chamber is arranged on the wall body of the burner, an air inlet pipe and a gas inlet pipe are arranged on two sides of the hot air outlet pipe, an air distribution channel and a gas distribution channel are respectively arranged in the wall body of the burner, the air distribution channel is communicated with the air inlet pipe channel, the gas distribution channel is communicated with a lower port of the gas inlet pipe channel, the air inlet pipe channel and the gas inlet pipe channel are communicated with a lower port of a premixed gas channel, and the upper end of the premixed gas channel is communicated with the combustion chamber through a premixed gas outlet; 10-100 premixed gas passageways are uniformly distributed in intervals, and the angle is at least more than two folding angles relative to the vertical direction from top to bottom, so that the high-temperature scouring and explosion-proof performance is strong, the energy-saving and environment-friendly premixed gas device is energy-saving and environment-friendly, long in service life, stable in operation and high in efficiency.

Description

Low-nitrogen efficient explosion-proof high-air-temperature long-life top-combustion hot blast stove

Technical Field

The utility model relates to a hot blast stove, in particular to a low-nitrogen high-efficiency explosion-proof high-air-temperature long-life top combustion type hot blast stove.

Background

Energy conservation, yield increase, efficiency increase, coke ratio reduction and emission reduction of the modern blast furnace high-air-temperature hot blast stove are more and more emphasized by the iron-making industry, so that various methods are adopted to improve the air temperature, reduce the iron-making cost and increase the enterprise benefit at present, for example, a high-heat-storage top-combustion hot blast stove of application number 201120445726.8 has the problems in structure and manufacturing method, especially because a gas loop is arranged on the top, a connecting pipe for connecting a nozzle and the loop is transversely arranged, when a gas valve is closed, a large amount of gas remains in a dead zone on the upper part of the loop, a large amount of high-temperature air is pressed into the loop during air supply to cause knocking and damage a bridge brick and a nozzle of the loop, when the air supply is finished, a large amount of high-temperature air remains in the gas loop, and the high-temperature air remaining in the gas loop is mixed with the knocking and damages the bridge brick and the nozzle of the loop when the gas valve is opened; the other problem is that the adopted external premixed combustion mode of the coal gas and the air has the disadvantages of uneven mixing, incomplete combustion and large air surplus coefficient, thus influencing the wind temperature and saving energy; due to poor mixing combustion uniformity, incomplete combustion of coal gas is caused, and the discharged carbon monoxide has large quantity and pollutes the environment; the air temperature is low, the vault temperature is high, the vault temperature and the air supply temperature difference are large due to the large amount of cold air brought into the hot blast stove, the vault temperature is very high under the condition of realizing high air temperature, the emission of nitrogen oxides is up to more than 100 plus 150 mg, and the defects exist, are inconsistent with environmental protection, high efficiency and long service life, and are imperative in improvement and innovation.

SUMMERY OF THE UTILITY MODEL

Aiming at the situation and overcoming the defects of the prior art, the utility model aims to provide the low-nitrogen high-efficiency explosion-proof high-air-temperature long-life top combustion type hot blast stove which can effectively solve the problems of improving energy conservation, increasing yield, improving efficiency, reducing coke ratio and having safety and long life.

The technical scheme includes that the low-nitrogen high-efficiency explosion-proof high-wind-temperature long-life top-burning hot-blast stove comprises a vault, a burner, a hot-blast stove wall, an air inlet pipe, a gas inlet pipe and a hot-blast outlet pipe, wherein the vault is arranged on the upper portion of the burner, the burner is arranged on the upper portion of the hot-blast stove wall, the hot-blast outlet pipe is arranged on one side of the burner, the air inlet pipe and the gas inlet pipe are arranged on two sides of the hot-blast outlet pipe, a combustion chamber is formed between the inner surface of the vault and the upper portion of the burner, the burner is sleeved outside the upper portion of the hot-blast stove wall, a heat storage chamber is formed in the hot-blast stove wall, checker bricks serving as heat storage bodies are arranged in the heat storage chamber (known technology), the burner wall is formed by high-temperature, scouring and explosion-proof pouring materials, the hot-blast outlet pipe is communicated with the combustion chamber, the upper and lower air inlet pipes and the gas inlet pipes are arranged on two sides of the hot-blast outlet pipe, an air distribution channel and a gas distribution channel which are communicated with an air inlet pipe and a gas inlet pipe are respectively arranged in the wall body of the combustor, the lower end port of the air distribution channel is communicated with the upper end port of the air inlet pipe channel in the wall body of the combustor, the upper end port of the gas distribution channel is communicated with the lower end port of the gas inlet pipe channel in the wall body of the combustor, the upper end ports of the air inlet pipe channel and the gas inlet pipe channel are communicated with the lower end port of a premixed gas channel in the wall body of the combustor, and the upper end of the premixed gas channel is communicated with the inside of the combustion chamber through a premixed gas outlet; the number of the premixed gas channels is 10-100, the premixed gas channels are uniformly distributed in an intermittent mode, the premixed gas channels are sequentially provided with at least more than two zigzag angles relative to the vertical direction from top to bottom, the first angle G degrees is 5-30 degrees, the second angle H degrees is 15-60 degrees, the lower portion of the heat storage chamber is provided with a cold air chamber, and two side walls of the cold air chamber are respectively provided with a manhole and a cold air/flue pipe;

the high-temperature-resistant scouring-resistant explosion-proof castable is prepared by uniformly mixing a powder raw material and water, wherein the powder raw material is a composite prepared by uniformly mixing bauxite with different particle sizes, CA-80 high-alumina cement, alumina powder, kyanite, silicon micropowder, sodium tripolyphosphate and explosion-proof fibers.

The utility model has novel and unique structure, realizes complete mixed combustion at the mixed gas outlet, has smooth and uniform circumferential return flue gas, high efficiency, high wind temperature, small vault temperature and air supply temperature difference, low nitrogen oxide discharge, strong heat storage capacity and sufficient combustion, and is characterized in that the mixed combustion nozzle of gas and air has strong high-temperature erosion resistance and explosion resistance, energy conservation, environmental protection, long service life, stable operation and high efficiency, thereby being a great innovation on the hot blast stove.

Drawings

Fig. 1 is a front view of the structure of the present invention in cross section.

Fig. 2 is a sectional front view of the burner air inlet pipe and the gas inlet pipe of the present invention.

FIG. 3 is a front view, taken along the line A-A in FIG. 1, illustrating the present invention.

FIG. 4 is a front view, taken along the line B-B in FIG. 1, illustrating the present invention.

FIG. 5 is a front view, in section C-C, of FIG. 1 in accordance with the present invention.

FIG. 6 is a front view, taken along the line D-D of FIG. 1, illustrating the present invention.

FIG. 7 is a front view, in section E-E, of FIG. 1 in accordance with the present invention.

Fig. 8 is a front view of a cross section of another embodiment of the present invention.

Fig. 9 is a front view, taken along the line D-D in fig. 8, of the present invention.

Fig. 10 is a front view, in section E-E, of fig. 8 in accordance with the utility model.

Detailed Description

As shown in figures 1-7, the low-nitrogen high-efficiency explosion-proof high-air-temperature long-life top-burning hot-blast stove comprises a vault, a burner, a hot-blast stove wall, an air inlet pipe, a gas inlet pipe and a hot-blast outlet pipe, wherein the vault is arranged at the upper part of the burner, the burner is arranged at the upper part of the hot-blast stove wall, the hot-blast outlet pipe is arranged on one side of the burner, the air inlet pipe and the gas inlet pipe are arranged at two sides of the hot-blast outlet pipe, a combustion chamber 2 is formed between the inner surface of the vault 1 and the upper part of the burner 3, the burner 3 is sleeved outside the upper part of the hot-blast stove wall, a heat storage chamber 4 is formed in the hot-blast stove wall, a checker brick serving as a heat storage body is arranged in the heat storage chamber 4, the wall of the burner 3 is formed by pouring high-temperature-resistant scouring-resistant explosion-proof castable, a hot-blast outlet pipe 11 communicated with the combustion chamber 2 is arranged on one side of the burner 3, and an upper air inlet pipe 8 and a lower gas inlet pipe 9 are arranged at two sides of the hot-blast outlet pipe, an air distribution channel 6 and a gas distribution channel 7 which are communicated with an air inlet pipe 8 and a gas inlet pipe 9 are respectively arranged in the wall body of the combustor, the lower end port of the air distribution channel 6 is communicated with the upper end port of an air inlet pipe channel 8-1 in the wall body of the combustor, the upper end port of the gas distribution channel 7 is communicated with the lower end port of the gas inlet pipe channel 9-1 in the wall body of the combustor, the upper end ports of the air inlet pipe channel 8-1 and the gas inlet pipe channel 9-1 are communicated with the lower end port of a premixed gas channel 10 in the wall body of the combustor, and the upper end of the premixed gas channel 10 is communicated with the inside of the combustion chamber 2 through a premixed gas outlet 12; the number of the premixed gas channels 10 is 10-100 which are uniformly distributed in an intermittent manner, the premixed gas channels 10 are at least more than two zigzag angles relative to the vertical direction from top to bottom in sequence, the first angle G is 5-30 degrees, the second angle H is 15-60 degrees, the lower part of the heat storage chamber 4 is provided with a cold air chamber 5, and two side walls of the cold air chamber 5 are respectively provided with a manhole 5-1 and a cold air/flue pipe 5-2.

In order to ensure the using effect and the convenience of use, the explosion-proof fiber is a well-known and commercially available product, such as a product of permanent refractory company Limited in the firm market.

The air inlet pipe channel 8-1 is upward inclined, and the included angle F degree between the air inlet pipe channel and the vertical direction is 15-85 degrees.

The included angle of the air inlet pipe 8 relative to the horizontal direction is 15-85 degrees, and the included angle of the gas inlet pipe 9 relative to the horizontal direction is 15-90 degrees.

The hot air outlet pipe 11 penetrates through the wall body of the burner, is embedded in a straight wall at the upper part of the wall body of the hot blast stove and is communicated with the combustion chamber 2.

The air inlet pipe channel 8-1 and the coal gas inlet pipe channel 9-1 are identical in transverse length and are corresponding in opening to opening, the length of the coal gas pipe channel opening is 1-N times of the width, and the length of the air pipe channel opening is 1-B times of the width.

Fig. 8 is a structural view showing another embodiment of the present invention, which is different only in the structure of the premixed gas passage 10, the premixed gas passage 10 is shown as a separate type in fig. 1, and fig. 8 is shown as an integrated passage which is vertically arranged up and down.

The utility model has novel and unique structure, the transverse lengths of the air inlet pipe orifice and the coal gas inlet pipe orifice are the same and corresponding, the width is 1-N times of the length, the mixed gas outlet channel has at least more than two folding angles relative to the vertical direction from top to bottom, the figure shows that the two folding angles are two, and the first angle is 5-30 degrees; the second angle is 15-60 degrees. The tangential mixing mode of the flat and thin opening with the width and the length is adopted, the probability of cutting-in and mixing of the coal gas and the air is increased through at least two folding angles, so that the coal gas and the air are mixed more uniformly in the tangential direction, and the effect of complete combustion is achieved.

The utility model realizes the complete mixed combustion at the mixed gas outlet, the flue gas which is turned back in the circumferential direction is smooth and uniform, the efficiency is high, the air temperature is high, the vault temperature and the air supply temperature difference are small, the emission of nitrogen oxides is low, the heat storage capacity is strong, the combustion is sufficient, and the key is that the mixed combustion nozzle of the coal gas and the air has strong high-temperature erosion resistance and explosion resistance, and the mixed combustion nozzle is energy-saving, environment-friendly, long in service life, stable in operation and high in efficiency. Through multiple tests and tests on the spot, the efficiency is averagely improved by about 30 percent, the wind temperature is improved by more than 50 ℃, and the emission of nitrogen oxides is less than 28mg/m³The service life of the burner is prolonged by more than 3 times, no gas explosion phenomenon occurs in the experiment, the use is safe, the effect is good, the energy conservation and environmental protection are effectively realized, and the burner is a top burnerThe hot blast stove is an innovation, and has remarkable economic and social benefits.

Claims

1. A low-nitrogen high-efficiency explosion-proof high-air-temperature long-life top-burning hot-blast stove comprises a vault, a burner, a hot-blast stove wall, an air inlet pipe, a gas inlet pipe and a hot-air outlet pipe, wherein the vault is arranged on the upper portion of the burner, the burner is arranged on the upper portion of the hot-blast stove wall, the hot-air outlet pipe is arranged on the burner, the air inlet pipe and the gas inlet pipe are arranged on two sides of the hot-air outlet pipe, a combustion chamber (2) is formed between the inner surface of the vault (1) and the upper portion of the burner (3), the burner (3) is sleeved outside the upper portion of the hot-blast stove wall, a heat storage chamber (4) is formed in the hot-blast stove wall, lattice bricks serving as heat storage bodies are arranged in the heat storage chamber (4), the wall of the burner (3) is formed by pouring high-temperature erosion-resistant explosion-proof castable, one side of the burner (3) is provided with a hot-air outlet pipe (11) communicated with the combustion chamber (2), the upper air inlet pipe (8) and the gas inlet pipe (9) are arranged on two sides of the hot-air outlet pipe, an air distribution channel (6) and a gas distribution channel (7) which are communicated with an air inlet pipe (8) and a gas inlet pipe (9) are respectively arranged in the wall body of the combustor, the lower port of the air distribution channel (6) is communicated with the upper port of an air inlet pipe channel (8-1) in the wall body of the combustor, the upper port of the gas distribution channel (7) is communicated with the lower port of a gas inlet pipe channel (9-1) in the wall body of the combustor, the upper ports of the air inlet pipe channel (8-1) and the gas inlet pipe channel (9-1) are communicated with the lower port of a premixed gas channel (10) in the wall body of the combustor, and the upper end of the premixed gas channel (10) is communicated with the inside of the combustion chamber (2) through a premixed gas outlet (12); the number of the premixed gas channels (10) is 10-100, the premixed gas channels (10) are evenly distributed in an intermittent mode, the premixed gas channels (10) are at least more than two folding angles relative to the vertical direction from top to bottom in sequence, the first angle G degrees is 5-30 degrees, the second angle H degrees is 15-60 degrees, the lower portion of the heat storage chamber (4) is provided with a cold air chamber (5), and two side walls of the cold air chamber (5) are respectively provided with a manhole (5-1) and a cold air/flue pipe opening (5-2).

2. The low-nitrogen high-efficiency explosion-proof high-wind-temperature long-life top combustion hot blast stove according to claim 1, wherein the air inlet pipe passage (8-1) is upwardly inclined, and an included angle F ° with a vertical direction is 15-85 °.

3. The low-nitrogen high-efficiency explosion-proof high-air-temperature long-life top combustion hot blast stove according to claim 1, wherein the included angle of the air inlet pipe (8) relative to the horizontal direction is 15-85 degrees, and the included angle of the gas inlet pipe (9) relative to the horizontal direction is 15-90 degrees.

4. The low-nitrogen high-efficiency explosion-proof high-air-temperature long-life top-combustion hot-blast stove according to claim 1, wherein the hot-blast outlet pipe (11) penetrates through a wall of the burner, is embedded in a straight wall at the upper part of the wall of the hot-blast stove, and is communicated with the combustion chamber (2).

5. The low-nitrogen high-efficiency explosion-proof high-wind-temperature long-life top-burning hot-blast stove according to claim 1, wherein the air inlet pipe passage (8-1) and the gas inlet pipe passage (9-1) have the same transverse length and are corresponding in port to port, the length of the gas pipe passage port is 1-N times of the width, and the length of the air pipe passage port is 1-B times of the width.

6. The low-nitrogen high-efficiency explosion-proof high-air-temperature long-life top combustion hot blast stove according to claim 1, wherein the premixed gas channel (10) can also be arranged as an upper and lower vertical integrated channel.