CN107227382A - Hot blast stove system of blast furnace - Google Patents

Abstract

The invention provides a hot blast stove system for a blast furnace, which includes multiple hot blast stoves, multiple first heat exchange units, at least one second heat exchange unit, a combustion-supporting device, a chimney, an air main pipe, a gas main pipe and a flue gas main pipe. Each hot blast stove is arranged in one-to-one correspondence with a plurality of first heat exchange units, and each hot blast stove communicates with one of the flue gas main pipe and the gas main pipe and the air main pipe through the corresponding first heat exchange unit, and each hot blast stove passes through the first heat exchange unit. The second heat exchange unit communicates with the flue gas main pipe and the other one of the gas main pipe and the air main pipe, the flue gas main pipe communicates with the chimney, and the air main pipe communicates with the combustion-supporting device. The present invention can preheat at least one of the waste flue gas of the coal gas and the combustion-supporting air using a single hot blast stove, and can effectively use the heat of the high-temperature waste flue gas produced by the final combustion, so that the coal gas and/or the combustion-supporting air can reach 280 ℃～310℃, so as to further increase the vault temperature and hot air temperature of the hot blast stove.

Description

A blast furnace hot stove system

technical field

The invention relates to the technical field of blast furnace hot blast stoves in the metallurgical industry, in particular to a blast furnace hot blast stove system.

Background technique

In the metallurgical industry, increasing the hot air temperature is an effective way to save energy and reduce consumption in blast furnace ironmaking. For every 100°C increase in air temperature, the ton iron-coke ratio can be reduced by about 20kg, the amount of coal injection can be increased by about 50kg, and the output can be increased by about 4%. Therefore, all major iron and steel enterprises regard how to increase the temperature of hot air as a very important technology to study.

The most direct means to increase the temperature of the hot blast is to increase the vault temperature of the hot blast stove. Because the calorific value of blast furnace gas produced by blast furnace ironmaking is low, the hot blast stove using blast furnace gas as fuel generally has a low vault temperature, and it is difficult to obtain a higher hot blast temperature. For this reason, some iron and steel enterprises mix a small amount of high calorific value gas (such as coke oven gas, converter gas, natural gas, etc.) into the blast furnace gas for firing. For enterprises, although higher hot air temperature can be obtained, the consumption of high-calorific value gas with higher value is increased, which is not the best furnace burning scheme.

Another way to increase the temperature of the vault is to preheat the blast furnace gas and combustion-supporting air used in the furnace. The introduction of physical heat increases the theoretical combustion temperature during combustion, thereby obtaining a higher vault temperature. The commonly used methods are: 1. Use the high-temperature flue gas produced by the additional preheating furnace or the pre-combustion furnace to preheat the combustion-supporting air at high temperature; Preheat over low heat. Method 1 needs to consume a large amount of blast furnace gas during the production process, which is not an economical and effective method; Method 2 effectively utilizes the waste heat of the waste flue gas generated by the hot blast stove without additional consumption of gas, which improves the efficiency of the hot blast stove to a certain extent. Vault temperature; but due to the limitations of system settings, there are still great disadvantages: in the prior art, each blast furnace is generally equipped with 3 to 4 hot blast stoves, and the waste flue gas produced by each hot blast stove during the production process is uniform. Mix together, and use the mixed waste flue gas to preheat the coal gas and combustion-supporting air. In the combustion process of each hot blast stove, the temperature of the waste flue gas generated during the early stage of the furnace is relatively low, while the temperature of the waste gas generated at the end of the furnace is low. The temperature of the exhaust gas is relatively high. Since each hot blast stove is not in the pre-burning stage or the final firing stage at the same time, when the waste flue gas of each hot blast stove is mixed, the heat of the higher-temperature exhaust gas will be transferred to the higher-temperature exhaust gas. The low exhaust gas makes the temperature of the mixed exhaust gas the average value, and the heat of the higher temperature exhaust gas cannot be used alone. When preheating the gas and combustion air, only the gas and combustion air can be preheated. When it is heated to 170℃～210℃, the temperature of the hot air in the hot blast stove will not exceed 1240℃. For the pre-combustion that does not require too high temperature, it is not necessary to preheat the gas and combustion air to 170℃～210℃, so some The heat is wasted, and for the final combustion that requires a higher temperature, the preheating temperature is not enough when the gas and combustion air are preheated to 170 ° C ~ 210 ° C, and the vault temperature and hot air temperature of the hot blast stove cannot be further increased. Therefore, how to increase the temperature of the hot air by using the heat of the waste flue gas more efficiently is an urgent problem to be solved by those skilled in the art.

Contents of the invention

The purpose of the present invention is to provide a hot blast stove system of a blast furnace. When using the waste flue gas of the hot blast stove to preheat the coal gas and the combustion air, at least one of the gas and the combustion air is heated by the waste flue gas of a single hot blast stove. Preheating, in the final combustion process, can effectively use the heat of the high-temperature waste flue gas produced by the final combustion, and directly preheat the coal gas and/or combustion air without mixing with the waste flue gas of other hot blast stoves Heat, so that the gas and/or combustion-supporting air reach 280 ℃ ~ 310 ℃, thereby further increasing the vault temperature and hot air temperature of the hot blast stove.

To achieve the above object, the present invention provides a hot blast stove system of a blast furnace, wherein the hot blast stove system of the blast furnace includes a plurality of hot blast stoves, a plurality of first heat exchange units, at least one second heat exchange unit, and a combustion-supporting device , chimney, air main pipe, gas main pipe and flue gas main pipe, a plurality of said hot blast stoves are provided in one-to-one correspondence with a plurality of said first heat exchange units, and each said hot blast stove passes through the corresponding first heat exchange units respectively It communicates with the flue gas main pipe, and each of the hot blast stoves communicates with the flue gas main pipe through the second heat exchange unit, and the flue gas main pipe communicates with the chimney, and each of the hot blast stoves passes through the corresponding The first heat exchange unit communicates with one of the air main pipe and the gas main pipe, and each of the hot blast stoves communicates with one of the air main pipe and the gas main pipe through the second heat exchange unit. The other is connected, the air main pipe is in communication with the combustion-supporting device, and the combustion-supporting device can feed combustion-supporting air into the air main pipe.

The hot blast stove system of a blast furnace as described above, wherein there are multiple second heat exchange units, and the multiple second heat exchange units are arranged in one-to-one correspondence with the multiple hot blast stoves, and each of the hot blast stoves They communicate with the chimney respectively through the corresponding second heat exchange units, and each of the hot blast stoves communicates with the other one of the air main pipe and the gas main pipe through the corresponding second heat exchange units respectively.

The hot blast stove system of a blast furnace as described above, wherein one second heat exchange unit is provided, each of the hot blast stoves communicates with the chimney through the second heat exchange unit, and each of the hot blast stoves It communicates with the other of the air main pipe and the gas main pipe through the second heat exchange unit.

The hot blast stove system of a blast furnace as described above, wherein, the first heat exchange unit is an air heat exchange unit, the second heat exchange unit is a gas heat exchange unit, and each of the hot blast stoves passes through the corresponding first heat exchange unit. A heat exchange unit communicates with the air main pipe, and each of the hot blast stoves communicates with the gas main pipe through the second heat exchange unit.

The hot blast stove system of a blast furnace as described above, wherein, the first heat exchange unit is a gas heat exchange unit, the second heat exchange unit is an air heat exchange unit, and each of the hot blast stoves passes through the corresponding first heat exchange unit. A heat exchange unit communicates with the gas main pipe, and each of the hot blast stoves communicates with the air main pipe through the second heat exchange unit.

The hot blast stove system of a blast furnace as described above, wherein the first heat exchange unit includes a first heat exchanger, a first branch pipe and a first flue gas pipe, and the first branch pipe and the first flue gas pipe are both running through the first heat exchanger, and the first branch pipe is arranged in parallel with the first flue gas pipe,

One end of the first branch pipe communicates with the corresponding hot blast stove, the other end of the first branch pipe communicates with the gas main pipe or the air main pipe, and is located between the hot blast stove and the first heat exchanger The first branch pipe between is provided with a first outflow valve, and the first branch pipe located between the gas main pipe and the first heat exchanger or between the air main pipe and the first heat exchanger There is a first inflow valve on it,

One end of the first flue gas pipe communicates with the corresponding hot blast stove, the other end of the first flue gas pipe communicates with the flue gas main pipe, and is located between the hot blast stove and the first heat exchanger A first flue gas inflow valve is provided on the first flue gas pipe between the pipes, and a first flue gas valve is arranged on the first flue gas pipe between the main flue gas pipe and the first heat exchanger. outflow valve.

The hot blast stove system of a blast furnace as described above, wherein, the first heat exchange unit further includes a first bypass pipe and a first flue gas bypass pipe, one end of the first bypass pipe is connected to the first outlet The valve communicates with the hot blast stove with the first branch pipe, and the other end of the first bypass pipe is between the gas main pipe and the first inflow valve or between the air main pipe and the first inflow valve. The valves communicate with the first branch pipe, and the first bypass pipe is provided with a first bypass valve; one end of the first smoke bypass pipe is connected between the first smoke inflow valve and the The hot blast stove communicates with the first flue gas pipe, and the other end of the first flue gas bypass pipe is connected between the flue gas main pipe and the first flue gas outflow valve. The first flue gas bypass pipe is provided with a first flue gas bypass valve;

A first regulating valve is arranged on the first branch pipe between the junction of the first branch pipe and the first bypass pipe and the hot blast stove, and a first regulating valve is located between the first regulating valve and the hot blast stove. The first branch pipe between them is provided with a first combustion valve;

A first flue gas shut-off valve is provided on the first flue gas pipe between the connection between the first flue gas pipe and the first flue gas bypass pipe and the hot blast stove.

The hot blast stove system of a blast furnace as described above, wherein, the second heat exchange unit includes a second heat exchanger, a second branch pipe and a second flue gas pipe, and the second branch pipe and the second flue gas pipe are both passing through the second heat exchanger, and the second branch pipe is arranged in parallel with the second flue gas pipe,

One end of the second branch pipe communicates with the hot blast stove, the other end of the second branch pipe communicates with the gas main pipe or the air main pipe, and the The second branch pipe is provided with a second outflow valve, and the second branch pipe located between the gas main pipe and the second heat exchanger or between the air main pipe and the second heat exchanger is provided with a second outflow valve. There is a second inflow valve,

One end of the second flue gas pipe communicates with the hot blast stove, the other end of the second flue gas pipe communicates with the flue gas main pipe, and the The second flue gas pipe is provided with a second flue gas inflow valve, and the second flue gas pipe located between the flue gas main pipe and the second heat exchanger is provided with a second flue gas outflow valve .

The hot blast stove system of a blast furnace as described above, wherein, the second heat exchange unit further includes a second bypass pipe and a second flue gas bypass pipe, and one end of the second bypass pipe is connected to the second outlet The valve communicates with the hot blast stove with the second branch pipe, and the other end of the second bypass pipe is between the gas main pipe and the second inflow valve or between the air main pipe and the second inflow valve. The valves communicate with the second branch pipe, and the second bypass pipe is provided with a second bypass valve; one end of the second smoke bypass pipe is connected between the second smoke inflow valve and the The hot blast stove communicates with the second flue gas pipe, and the other end of the second flue gas bypass pipe is connected between the flue gas main pipe and the second flue gas outflow valve. The pipe is connected, and the second flue gas bypass pipe is provided with a second flue gas bypass valve;

A second regulating valve is arranged on the second branch pipe between the junction of the second branch pipe and the second bypass pipe and the hot blast stove, and a second regulating valve is located between the second regulating valve and the hot blast stove. The second branch pipe between is provided with a second combustion valve;

A second flue gas shut-off valve is provided on the second flue gas pipe between the connection between the second flue gas pipe and the second flue gas bypass pipe and the hot blast stove.

The hot blast stove system of a blast furnace as described above, wherein the combustion-supporting device includes a first combustion-supporting fan and a second combustion-supporting fan, the first combustion-supporting fan communicates with the air main pipe through a first air pipe, and the second combustion-supporting fan The fan communicates with the main air pipe through the second air pipe, the first air pipe is provided with a first valve, and the second air pipe is provided with a second valve.

Compared with prior art, advantage of the present invention is as follows:

1. By setting a plurality of first heat exchange units and a plurality of hot blast stoves in one-to-one correspondence, the present invention can effectively ensure that one of the gas and combustion-supporting air can be used alone to bring about the exhaust gas of the corresponding hot blast stove. It does not need to be mixed with the waste flue gas of other hot blast stoves. During the final combustion, the large amount of heat brought by the final combustion can effectively preheat the gas or combustion air to 280 ℃ ~ 310 ℃, which can effectively improve the efficiency of the hot blast stove. Vault temperature and hot air temperature;

2. The present invention is also provided with at least one second heat exchange unit. When the number of the second heat exchange unit is equal to that of the hot blast stove, it is set in the same way as the first heat exchange unit, so that each hot blast stove is only connected to one second heat exchange unit. The heat exchange units are connected. At this time, the first heat exchange unit and the second heat exchange unit can only use the waste flue gas in the corresponding hot blast stove to preheat the coal gas and combustion air at the same time. During the final combustion, the final combustion zone The large amount of heat can effectively preheat the gas and combustion air to 280 ℃ ~ 310 ℃ at the same time, so as to further increase the vault temperature and hot air temperature of the hot blast stove.

In summary, the present invention can preheat at least one of the waste flue gas of coal gas and combustion-supporting air using a single hot blast stove, and can effectively utilize the high-temperature waste flue gas generated by the final combustion during the final combustion process. Heat, directly preheating the coal gas and/or combustion-supporting air without mixing with the waste flue gas of other hot blast stoves, so that the gas and/or combustion-supporting air reach 280 ° C ~ 310 ° C, thereby further improving the vault of the hot blast stove temperature and hot air temperature.

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. in:

Fig. 1 is the structural representation of the hot blast stove system of blast furnace provided by the present invention;

Fig. 2 is another schematic structural view of the hot blast stove system of the blast furnace provided by the present invention;

Fig. 3 is another schematic structural view of the hot blast stove system of the blast furnace provided by the present invention;

Fig. 4 is another structural schematic diagram of the hot blast stove system of the blast furnace provided by the present invention.

Explanation of reference numbers:

1 hot stove

2 The first heat exchange unit

21 First heat exchanger

22 First branch

221 First inflow valve

222 First outflow valve

223 First regulating valve

224 First combustion valve

225 First shut-off valve

23 First flue gas pipe

231 First flue gas inflow valve

232 First flue gas outflow valve

233 The first flue gas shut-off valve

24 First bypass pipe

241 First bypass valve

25 The first flue gas bypass pipe

251 First flue gas bypass valve

3 Second heat exchange unit

31 Second heat exchanger

32 Second branch pipe

321 Second Inlet Valve

322 Second outflow valve

323 Second regulating valve

324 Second combustion valve

325 Second shut-off valve

33 Second flue gas pipe

331 Second flue gas inlet valve

332 Second flue gas outlet valve

333 Second flue gas shut-off valve

34 Second bypass pipe

341 Second bypass valve

35 Second flue gas bypass pipe

351 Second flue gas bypass valve

4 Combustion device

41 The first combustion fan

42 First air pipe

421 First Valve

43 Second combustion fan

44 Second air tube

441 Second valve

5 chimneys

6 air mains

7 Gas main

8 Flue gas main

detailed description

In order to have a clearer understanding of the technical solutions, objectives and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

As shown in Figures 1 to 2, the present invention provides a hot blast stove system for a blast furnace, wherein the hot blast stove system for a blast furnace includes a plurality of hot blast stoves 1, a plurality of first heat exchange units 2, and at least one second heat exchange unit Unit 3, combustion-supporting device 4, chimney 5, air main pipe 6, gas main pipe 7 and flue gas main pipe 8, multiple hot blast stoves 1 and multiple first heat exchange units 2 are arranged in one-to-one correspondence, and each hot blast stove 1 passes through the corresponding The first heat exchange unit 2 communicates with the flue gas main pipe 8, and each hot blast stove 1 communicates with the flue gas main pipe 8 through the second heat exchange unit 3, and the flue gas main pipe 8 communicates with the chimney 5, and each hot blast stove 1 passes through the corresponding The first heat exchange unit 2 communicates with one of the air main pipe 6 and the gas main pipe 7, and each hot blast stove 1 communicates with the other one of the air main pipe 6 and the gas main pipe 7 through the second heat exchange unit 3, thus it can be seen It is shown that for the first heat exchange unit 2, the flue gas entering each first heat exchange unit 2 is the waste flue gas produced by the corresponding hot blast stove 1, and the waste flue gas is not combined with other hot blast stove 1. In the final combustion process, the temperature of the flue gas is higher than the temperature of the mixed waste flue gas in the prior art, and one of the gas and the combustion air can be preheated to 280 ° C ~ 310 ° C, Much higher than the 170°C to 210°C of the prior art, on this basis, no matter whether the arrangement of the second heat exchange unit 3 and each hot blast stove 1 is the same as that of the prior art or the arrangement of the first heat exchange unit 2 Equally, because the temperature of a kind of in coal gas and combustion-supporting air increases greatly, compared with the prior art, the vault temperature in the hot blast stove 1 and the hot blast temperature all have obvious improvement, even if the present invention does not increase the power consumption of energy , can effectively use the waste heat of flue gas at different stages in the hot blast furnace firing cycle, increase the maximum preheating temperature of gas and/or combustion-supporting air, thereby increasing the temperature of the vault and obtaining high-temperature air; the air main pipe 6 communicates with the combustion-supporting device 4 to support combustion The device 4 can feed combustion-supporting air into the air main pipe 6, the gas main pipe 7 communicates with the existing gas supply system, and the coal gas main pipe 7 has coal gas.

Wherein, the hot blast stove 1 can be in different forms such as top combustion type, external combustion type, internal combustion type or spherical hot blast stove, and the hot blast stove 1 can be 2, 3, 4 or other numbers, and the present invention does not rely on this limit.

Further, as shown in Fig. 3 and Fig. 4, the present invention provides a hot blast stove system of a blast furnace, wherein, the setting method of the first heat exchange unit 2 is as described above, and will not be repeated here. On this basis, The second heat exchanging unit 3 is provided with a plurality of, and a plurality of second heat exchanging units 3 are provided with a plurality of hot blast stoves 1 one by one, and each hot blast stove 1 communicates with the chimney 5 through the corresponding second heat exchanging unit 3 respectively, and Each hot blast stove 1 communicates with the other one of the air main pipe 6 and the gas main pipe 7 through the corresponding second heat exchange unit 3 . That is, the second heat exchange unit 3 is set in the same way as the first heat exchange unit 2, and the flue gas entering each second heat exchange unit 3 is also the waste flue gas produced by the corresponding hot blast stove 1, and the waste flue gas is not mixed with The waste flue gas produced by other hot blast stoves 1 is mixed. During the final combustion process, the temperature of the flue gas is higher than that of the mixed waste flue gas in the prior art, and the other one of the gas and the combustion air can also be preheated. To 280 ℃ ~ 310 ℃, that is to say, the waste flue gas produced by each hot blast stove 1 is divided into two parts, one part flows into the first heat exchange unit 2 and the other part flows into the second heat exchange unit 3, while the combustion air and The coal gas is preheated, and both the gas and the combustion air are preheated to 280°C to 310°C, so as to further increase the vault temperature and hot air temperature in the hot blast stove 1, so that a stable hot air of 1300°C can be obtained.

Further, as shown in Fig. 4, the present invention provides a hot blast stove system for a blast furnace, wherein, the setting method 2 of the first heat exchange unit is as described above, and will not be repeated here. On this basis, the second heat exchange unit One heat unit 3 is provided, and each hot blast stove 1 is communicated with the chimney 5 through the second heat exchange unit 3, and each hot blast stove 1 is communicated with the other one of the air main pipe 6 and the gas main pipe 7 through the second heat exchange unit 3 . When the second heat exchange unit 3 is arranged in this way, that is to make a part of the waste flue gas produced by each hot blast stove 1 flow to the same second heat exchange unit 3, it can also be understood that the waste gas flowing into the second heat exchange unit 3 The flue gas is a mixture of waste flue gas produced by each hot blast stove 1. Compared with the prior art, this arrangement is equivalent to the gas preheated by the first heat exchange unit 2 (combustion-supporting air and coal gas). 1) the temperature is greatly increased to 280°C-310°C, while the gas preheated by the second heat exchange unit 3 (combustion-supporting air and coal gas) is basically maintained at 170°C-210°C, so that 1270°C can be obtained Compared with the prior art, the hot air is also improved to a certain extent. Setting the second heat exchange unit 3 as one can effectively reduce the components of the application, thereby reducing the occupied area and manufacturing cost.

To sum up, the setting method of the second heat exchange unit 3 can be only one, or it can be set in one-to-one correspondence with the hot blast stove 1 according to the number of hot blast stoves 1. Both methods can achieve the effect of increasing the temperature of the hot blast , the present invention is not limited thereto.

Furthermore, the present invention provides a hot blast stove system for a blast furnace, wherein the first heat exchange unit 2 is an air heat exchange unit, the second heat exchange unit 3 is a gas heat exchange unit, and each hot blast stove 1 passes through a corresponding The first heat exchange unit 2 communicates with the air main pipe 6, and each hot blast stove 1 communicates with the gas main pipe 7 through the second heat exchange unit 3. This setting can ensure that the combustion-supporting air entering each hot blast stove 1 can be subjected to a higher temperature. The preheating can reach 280°C-310°C; if the second heat exchange unit 3 is set to one, the temperature of the gas entering each hot blast stove 1 after preheating is basically 170°C-210°C, if the second heat exchange unit The unit 3 is set in one-to-one correspondence with each hot blast stove 1, and the gas entering each hot blast stove 1 can also be preheated at a higher temperature, which can reach 280°C to 310°C. It can be understood that in the final combustion process, the combustion-supporting The air has a higher preheating temperature, while the preheating temperature of the gas varies according to the arrangement of the second heat exchange unit 3 .

Furthermore, the present invention provides a hot blast stove system for a blast furnace, wherein the first heat exchange unit 2 is a gas heat exchange unit, the second heat exchange unit 3 is an air heat exchange unit, and each hot blast stove 1 passes through a corresponding The first heat exchange unit 2 communicates with the gas main pipe 7 , and each hot blast stove 1 communicates with the air main pipe 6 through the second heat exchange unit 3 . This setting method is to exchange the gas with the combustion-supporting air, so that the gas is preheated through the first heat exchange unit 2, and the combustion-supporting air is preheated through the second heat exchange unit 3. During the final combustion process, the gas can have Higher preheating temperature, while the preheating temperature of the combustion air varies according to the arrangement of the second heat exchange unit 3 .

Further, as shown in Figures 1 to 4, the present invention provides a hot blast stove system for a blast furnace, wherein the first heat exchange unit 2 includes a first heat exchanger 21, a first branch pipe 22 and a first flue gas pipe 23. Both the first branch pipe 22 and the first flue gas pipe 23 run through the first heat exchanger 21, and the first branch pipe 22 and the first flue gas pipe 23 are arranged in parallel. The gas (coal gas or combustion air) in the first branch pipe 22 Exchange heat with the flue gas in the first flue gas pipe 23 inside the first heat exchanger 21, and transfer the heat of the flue gas to the gas in the first branch pipe 22;

One end of the first branch pipe 22 communicates with the top of the corresponding hot blast stove 1, and the other end of the first branch pipe 22 communicates with the gas main pipe 7 or the air main pipe 6, and the first branch pipe between the hot blast stove 1 and the first heat exchanger 21 22 is provided with a first outflow valve 222, and the first branch pipe 22 between the gas main pipe 7 and the first heat exchanger 21 or between the air main pipe 6 and the first heat exchanger 21 is provided with a first inflow valve 221. Or the combustion-supporting air enters the first branch pipe 22 and then flows through the first inflow valve 221 into the first heat exchanger 21, exchanges heat with the flue gas in the first heat exchanger 21, and then flows out of the first heat exchanger 21, And flow through the first outflow valve 222 and flow into the hot blast stove 1 along the first branch pipe 22. The setting of the first inflow valve 221 and the first outflow valve 222 is convenient for manual operation to switch the supply of gas. At the same time, at the first inflow valve 221 The first heat exchanger 21 can also be overhauled in a state where both the first outflow valve 222 and the first outlet valve 222 are closed;

One end of the first flue gas pipe 23 communicates with the bottom of the corresponding hot blast stove 1, and the other end of the first flue gas pipe 23 communicates with the flue gas main pipe 8. The flue gas pipe 23 is provided with a first flue gas inflow valve 231, and the first flue gas pipe 23 between the flue gas main pipe 8 and the first heat exchanger 21 is provided with a first flue gas outflow valve 232. The hot blast stove 1 The flue gas inside flows into the first flue gas pipe 23 and enters the first heat exchanger 21 through the first flue gas inflow valve 231, and exchanges heat with the gas in the first branch pipe 22 in the first heat exchanger 21 After that, it flows out from the first heat exchanger 21, and flows into the flue gas main pipe 8 along the first flue gas pipe 23 through the first flue gas outlet valve 232, and the first flue gas pipe 23 of each first heat exchange unit 2 flows out The flue gas all flows into the flue gas main pipe 8, and enters the chimney 5 from the flue gas main pipe 8 for discharge.

Furthermore, as shown in Figures 1 to 4, the present invention provides a hot blast stove system for a blast furnace, wherein the first heat exchange unit 2 further includes a first bypass pipe 24 and a first flue gas bypass pipe 25 One end of the first bypass pipe 24 communicates with the first branch pipe 22 between the first outflow valve 222 and the hot blast stove 1, and the other end of the first bypass pipe 24 is connected between the gas main pipe 7 and the first inflow valve 221 or between the air The main pipe 6 and the first inflow valve 221 communicate with the first branch pipe 22, and the first bypass pipe 24 is provided with a first bypass valve 241; one end of the first smoke bypass pipe 25 is connected to the first smoke inflow valve. 231 communicates with the hot blast stove 1 with the first flue gas pipe 23, and the other end of the first flue gas bypass pipe 25 communicates with the first flue gas pipe 23 between the flue gas main pipe 8 and the first flue gas outflow valve 232 , the first flue gas bypass pipe 25 is provided with a first flue gas bypass valve 251; the first bypass pipe 24 is equivalent to parallel with the first branch pipe 22, and the first flue gas bypass pipe 25 is equivalent to the first The flue gas pipes 23 are connected in parallel. When the first branch pipe 22 is blocked or damaged and cannot work normally, the gas or combustion-supporting air can enter the hot blast stove 1 through the first bypass pipe 24 by operating the first bypass valve 241. Similarly, when the first flue gas pipe 23 is blocked or damaged and cannot work normally, the flue gas can be discharged to the flue gas main pipe 8 through the first flue gas bypass pipe 25 by operating the first flue gas bypass valve 251 In order to discharge the waste flue gas in the hot blast stove 1 in time to prevent the pressure in the hot blast stove 1 from being too large, it should be noted that, when the first branch pipe 22 and the first flue gas pipe 23 work normally, the first Both the bypass valve 241 and the first flue gas bypass valve 251 are closed to ensure that the coal gas or combustion-supporting air can enter the hot blast stove 1 after being preheated, and to ensure that the waste flue gas in the hot blast stove 1 can enter the first flue gas Heat is provided for the preheating of coal gas or combustion-supporting air in the pipe 23;

The first branch pipe 22 between the junction of the first branch pipe 22 and the first bypass pipe 24 and the hot blast stove 1 is provided with a first regulating valve 223, and the first regulating valve 223 can be adjusted to pass into the hot blast stove 1. The flow rate of coal gas or combustion-supporting air, the first branch pipe 22 between the first regulating valve 223 and the hot blast stove 1 is provided with the first combustion valve 224 (i.e. switch valve), by setting the first combustion valve 224 can control the start or Stop feeding gas or combustion-supporting air into the hot blast stove 1;

A first flue gas shut-off valve 233 is provided on the first flue gas pipe 23 between the connection between the first flue gas pipe 23 and the first flue gas bypass pipe 25 and the hot blast stove 1. By setting the first flue gas shut-off valve The cut-off valve 233 can flexibly control the start or stop of introducing flue gas into the first flue gas pipe 23 according to factors such as the pressure in the hot blast stove 1 .

Furthermore, as shown in Figures 1 to 4, the present invention provides a hot blast stove system for a blast furnace, wherein the second heat exchange unit 3 includes a second heat exchanger 31, a second branch pipe 32 and a second flue gas Pipe 33, the second branch pipe 32 and the second flue gas pipe 33 all run through the second heat exchanger 31, and the second branch pipe 32 and the second flue gas pipe 33 are arranged in parallel, the gas (coal gas or combustion-supporting air) in the second branch pipe 32 ) exchanges heat with the flue gas in the second flue gas pipe 33 inside the second heat exchanger 31, and the heat of the flue gas is transferred to the gas in the second branch pipe 32;

One end of the second branch pipe 32 communicates with the top of the hot blast stove 1, and the other end of the second branch pipe 32 communicates with the gas main pipe 7 or the air main pipe 6, and is located on the second branch pipe 32 between the hot blast stove 1 and the second heat exchanger 31 A second outflow valve 322 is provided, and a second inflow valve 321 is provided on the second branch pipe 32 between the gas main pipe 7 and the second heat exchanger 31 or between the air main pipe 6 and the second heat exchanger 31, and the gas or combustion-supporting After entering the second branch pipe 32, the air flows through the second inflow valve 321 into the second heat exchanger 31, exchanges heat with the flue gas in the second heat exchanger 31, and then flows out of the second heat exchanger 31, and flows concurrently. Pass through the second outflow valve 322 and flow into the hot blast stove 1 along the second branch pipe 32. The setting of the second inflow valve 321 and the second outflow valve 322 is convenient for manual operation to switch the supply of gas. In the state where the two outflow valves 322 are all closed, the second heat exchanger 31 can also be overhauled;

One end of the second flue gas pipe 33 communicates with the bottom of the hot blast stove 1, and the other end of the second flue gas pipe 33 communicates with the flue gas main pipe 8. The second flue gas between the hot blast stove 1 and the second heat exchanger 31 The pipe 33 is provided with a second flue gas inflow valve 331, and the second flue gas pipe 33 between the flue gas main pipe 8 and the second heat exchanger 31 is provided with a second flue gas outflow valve 332. After the flue gas flows into the second flue gas pipe 33, it passes through the second flue gas inflow valve 331 and enters into the second heat exchanger 31, where it exchanges heat with the gas in the second branch pipe 32 in the second heat exchanger 31 and then from The second heat exchanger 31 flows out, and passes through the second flue gas outlet valve 332 and flows into the flue gas main pipe 8 along the second flue gas pipe 33. When the second heat exchange unit 3 is set in multiples, each second heat exchange unit The flue gas flowing out from the second flue gas pipe 33 of the unit 3 all flows into the flue gas main pipe 8, and enters the chimney 5 from the flue gas main pipe 8 for discharge; when the second heat exchange unit 3 is set as one, the second The flue gas pipe 33 is communicated with each hot blast stove 1 simultaneously through a plurality of branch pipes, and the flue gas of each hot blast stove 1 all enters in the second flue gas pipe 33 through respective branch pipes, and after being mixed in the second flue gas pipe 33 The second heat exchanger 31 exchanges heat with the gas in the second branch pipe 32 .

Furthermore, as shown in Figures 1 to 4, the present invention provides a hot blast stove system for a blast furnace, wherein the second heat exchange unit 3 further includes a second bypass pipe 34 and a second flue gas bypass pipe 35 One end of the second bypass pipe 34 communicates with the second branch pipe 32 between the second outflow valve 322 and the hot blast stove 1, and the other end of the second bypass pipe 34 is connected between the gas main pipe 7 and the second inflow valve 321 or between the air The main pipe 6 and the second inflow valve 321 communicate with the second branch pipe 32, and the second bypass pipe 34 is provided with a second bypass valve 341; one end of the second flue gas bypass pipe 35 is connected to the second flue gas inflow valve. 331 communicates with the hot blast stove 1 with the second flue gas pipe 33, and the other end of the second flue gas bypass pipe 35 communicates with the second flue gas pipe 33 between the flue gas main pipe 8 and the second flue gas outflow valve 332 , the second flue gas bypass pipe 35 is provided with a second flue gas bypass valve 351; the second bypass pipe 34 is equivalent to parallel with the second branch pipe 32, and the second flue gas bypass pipe 35 is equivalent to the second The flue gas pipes 33 are connected in parallel. When the second branch pipe 32 is blocked or damaged and cannot work normally, the gas or combustion-supporting air can enter the hot blast stove 1 through the second bypass pipe 34 by operating the second bypass valve 341. Similarly, when the second flue gas pipe 33 is blocked or damaged and cannot work normally, the flue gas can be discharged to the flue gas main pipe 8 through the second flue gas bypass pipe 35 by operating the second flue gas bypass valve 351 In order to discharge the waste flue gas in the hot blast stove 1 in time to prevent the pressure in the hot blast stove 1 from being too high, it should be noted that, when the second branch pipe 32 and the second flue gas pipe 33 work normally, the second Both the bypass valve 341 and the second flue gas bypass valve 351 are closed to ensure that the coal gas or combustion-supporting air can enter the hot blast stove 1 after being preheated, and to ensure that the waste flue gas in the hot blast stove 1 can enter the second flue gas Heat is provided for the preheating of coal gas or combustion-supporting air in the pipe 33;

The second branch pipe 32 between the junction of the second branch pipe 32 and the second bypass pipe 34 and the hot blast stove 1 is provided with a second regulating valve 323, and the second regulating valve 323 can be adjusted to pass into the hot blast stove 1 The flow of coal gas or combustion-supporting air, the second branch pipe 32 between the second regulating valve 323 and the hot blast stove 1 is provided with a second combustion valve 324 (i.e. switch valve), by setting the second combustion valve 324 can control the start or Stop feeding gas or combustion-supporting air into the hot blast stove 1;

A second flue gas shut-off valve 333 is arranged on the second flue gas pipe 33 between the junction of the second flue gas pipe 33 and the second flue gas bypass pipe 35 and the hot blast stove 1, and the second flue gas shut-off valve 333 is arranged. The cut-off valve 333 can flexibly control the start or stop of introducing flue gas into the second flue gas pipe 33 according to factors such as the pressure in the hot blast stove 1. It should be noted that no matter whether the second heat exchange unit 3 is set to one or set to Multiple, the second flue gas shut-off valves 333 are set in one-to-one correspondence. If there are multiple second heat exchange units 3, the second flue gas pipe 33 of each second heat exchange unit 3 is provided with a first Two flue gas cut-off valves 333, if the second heat exchange unit 3 is one, then the second flue gas shut-off valves are arranged on the sub-pipes of the second flue gas pipes 33 of each hot blast stove 1 and the second heat exchange unit 3 Cut off the valve 333, so that the exhaust gas discharge situation of each hot blast stove 1 is controlled separately.

Wherein, the pipeline connecting the gas main pipe 7 of the gas heat exchange unit and the hot blast stove 1 is also provided with a shut-off valve, which is used to quickly cut off the supply of gas in an emergency. For example, if the first heat exchange unit 2 is a gas heat exchange unit , the first branch pipe 22 is provided with a first shut-off valve 225, the first shut-off valve 225 is located between the first regulating valve 223 and the first combustion valve 224, if the second heat exchange unit 3 is a gas heat exchange unit, Then, the second branch pipe 32 is provided with a second shut-off valve 325 , and the second shut-off valve 325 is located between the second regulating valve 323 and the second combustion valve 324 .

Wherein, the first heat exchanger 21 and the second heat exchanger 31 can be a plate structure, a tube structure, a heat pipe (with heat transfer medium) structure or a combination of any two structures, and the present invention does not take this as a limit.

Further, as shown in Figures 1 to 4, the present invention provides a blast furnace hot blast stove system, wherein the combustion-supporting device 4 includes a first combustion-supporting fan 41 and a second combustion-supporting fan 43, and the first combustion-supporting fan 41 passes through the first The air pipe 42 communicates with the air main pipe 6, and the second combustion-supporting fan 43 communicates with the air main pipe 6 through the second air pipe 44. The first air pipe 42 and the second air pipe 44 are equivalent to parallel settings. The combustion-supporting fans 43 can blow the combustion-supporting air into the air main pipe 6 alone, the first air pipe 42 is provided with a first valve 421, and the second air pipe 44 is provided with a second valve 441, through which the first valve 421 and the second valve 441 are connected. The valve 441 can control the first combustion-supporting blower 41 and the second combustion-supporting blower 43 respectively. By arranging two combustion-supporting blowers, the other one can be enabled when one of them breaks down or routine maintenance is carried out, thereby ensuring the normal operation of the hot blast stove 1 .

Compared with prior art, advantage of the present invention is as follows:

1. By setting a plurality of first heat exchange units and a plurality of hot blast stoves in one-to-one correspondence, the present invention can effectively ensure that one of the gas and combustion-supporting air can be used alone to bring about the exhaust gas of the corresponding hot blast stove. It does not need to be mixed with the waste flue gas of other hot blast stoves. During the final combustion, the large amount of heat brought by the final combustion can effectively preheat the gas or combustion air to 280 ℃ ~ 310 ℃, which can effectively improve the efficiency of the hot blast stove. Vault temperature and hot air temperature;

2. The present invention is also provided with at least one second heat exchange unit. When the number of the second heat exchange unit is equal to that of the hot blast stove, it is set in the same way as the first heat exchange unit, so that each hot blast stove is only connected to one second heat exchange unit. The heat exchange units are connected. At this time, the first heat exchange unit and the second heat exchange unit can only use the waste flue gas in the corresponding hot blast stove to preheat the coal gas and combustion air at the same time. During the final combustion, the final combustion zone The large amount of heat can effectively preheat the gas and combustion air to 280 ℃ ~ 310 ℃ at the same time, so as to further increase the vault temperature and hot air temperature of the hot blast stove.

In summary, the present invention can preheat at least one of the waste flue gas of coal gas and combustion-supporting air using a single hot blast stove, and can effectively utilize the high-temperature waste flue gas generated by the final combustion during the final combustion process. Heat, directly preheating the coal gas and/or combustion-supporting air without mixing with the waste flue gas of other hot blast stoves, so that the gas and/or combustion-supporting air reach 280 ° C ~ 310 ° C, thereby further improving the vault of the hot blast stove temperature and hot air temperature.

The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. a kind of hot blast stove system of blast furnace, it is characterised in that the hot blast stove system of the blast furnace includes multiple hot-blast stoves, multiple First heat exchange unit, at least one second heat exchange unit, auxiliary combustion equipment, chimney, air supervisor, coal gas supervisor and flue gas supervisor, Multiple hot-blast stoves are corresponded with multiple first heat exchange units and set, and each hot-blast stove passes through corresponding institute respectively The first heat exchange unit is stated to connect with flue gas supervisor, and each hot-blast stove passes through second heat exchange unit and the cigarette Gas supervisor's connection, the flue gas supervisor connects with the chimney, and each hot-blast stove passes through corresponding first heat exchange respectively Unit and the air be responsible for and coal gas supervisor in one connect, and each hot-blast stove exchanges heat by described second Unit and the air be responsible for and coal gas supervisor in another connect, the air supervisor and auxiliary combustion equipment company Logical, the auxiliary combustion equipment is passed through combustion air in being responsible for the air.

2. the hot blast stove system of blast furnace according to claim 1, it is characterised in that second heat exchange unit is provided with more Individual, multiple second heat exchange units are corresponded with multiple hot-blast stoves and set, and each hot-blast stove passes through correspondence respectively Second heat exchange unit connected with the chimney, and each hot-blast stove passes through corresponding second heat exchange unit respectively Connected with another in air supervisor and coal gas supervisor.

3. the hot blast stove system of blast furnace according to claim 1, it is characterised in that second heat exchange unit is provided with one Individual, each hot-blast stove is connected by second heat exchange unit with the chimney, and each hot-blast stove is by described Second heat exchange unit and the air be responsible for and coal gas supervisor in another connect.

4. the hot blast stove system of the blast furnace according to any one of claims 1 to 3, it is characterised in that first heat exchange is single Member is air heat-exchange unit, and second heat exchange unit is coal gas heat exchange unit, and each hot-blast stove passes through corresponding institute respectively The first heat exchange unit is stated to connect with air supervisor, and each hot-blast stove passes through second heat exchange unit and the coal Gas supervisor's connection.

5. the hot blast stove system of the blast furnace according to any one of claims 1 to 3, it is characterised in that first heat exchange is single Member is coal gas heat exchange unit, and second heat exchange unit is air heat-exchange unit, and each hot-blast stove passes through corresponding institute respectively The first heat exchange unit is stated to connect with coal gas supervisor, and each hot-blast stove passes through second heat exchange unit and the sky Gas supervisor's connection.

6. the hot blast stove system of the blast furnace according to any one of claims 1 to 3, it is characterised in that first heat exchange is single Member includes First Heat Exchanger, the first branch pipe and the first fume pipe, and first branch pipe is with first fume pipe through described First Heat Exchanger, and first branch pipe be arranged in parallel with first fume pipe,

One end of first branch pipe is connected with the corresponding hot-blast stove, the other end of first branch pipe and the coal gas master Pipe or air supervisor's connection, first branch pipe between the hot-blast stove and the First Heat Exchanger is provided with the One outflow valve, positioned at the coal gas supervisor the First Heat Exchanger between or the air supervisor with the First Heat Exchanger it Between first branch pipe provided with first flow into valve,

One end of first fume pipe is connected with the corresponding hot-blast stove, the other end and the cigarette of first fume pipe Gas supervisor's connection, first fume pipe between the hot-blast stove and the First Heat Exchanger is provided with the first flue gas stream Enter valve, first fume pipe being responsible for positioned at the flue gas between the First Heat Exchanger flows out provided with the first flue gas Valve.

7. the hot blast stove system of blast furnace according to claim 6, it is characterised in that first heat exchange unit also includes the Bypass line and the first flue gas bypass pipe, one end of first bypass pipe is between the described first outflow valve and the hot-blast stove Connected with first branch pipe, the other end of first bypass pipe in the coal gas be responsible for flowed into described first between valve or Connected between the air supervisor and the described first inflow valve with first branch pipe, first bypass pipe is provided with by the of first Port valve；One end of the first flue gas bypass pipe in first flue gas flow between valve and the hot-blast stove with first cigarette Tracheae is connected, and the other end of the first flue gas bypass pipe is responsible between first flue gas outflow valve and institute in the flue gas The connection of the first fume pipe is stated, the first flue gas bypass pipe is provided with the first flue gas by-passing valve；

On first branch pipe between the junction and the hot-blast stove of first branch pipe and first bypass pipe Provided with the first regulating valve, first branch pipe between first regulating valve and the hot-blast stove is provided with the first burning Valve；

First cigarette between first fume pipe and the first flue gas bypass pipe junction and the hot-blast stove Tracheae is provided with the first flue gas shut-off valve.

8. the hot blast stove system of blast furnace according to claim 1, it is characterised in that

Second heat exchange unit includes the second heat exchanger, the second branch pipe and the second fume pipe, second branch pipe and described the Two fume pipes run through second heat exchanger, and second branch pipe be arranged in parallel with second fume pipe,

One end of second branch pipe is connected with the hot-blast stove, and the other end of second branch pipe is responsible for or institute with the coal gas Air supervisor's connection is stated, second branch pipe between the hot-blast stove and second heat exchanger is provided with the second outflow Valve, the institute between second heat exchanger or between air supervisor and second heat exchanger is responsible for positioned at the coal gas State the second branch pipe and flow into valve provided with second,

One end of second fume pipe is connected with the hot-blast stove, and the other end and the flue gas of second fume pipe are responsible for Connection, second fume pipe between the hot-blast stove and second heat exchanger flows into valve provided with the second flue gas, It is responsible for positioned at the flue gas second fume pipe between second heat exchanger provided with the second flue gas outflow valve.

9. the hot blast stove system of blast furnace according to claim 8, it is characterised in that second heat exchange unit also includes the Two bypass pipes and the second flue gas bypass pipe, one end of second bypass pipe is between the described second outflow valve and the hot-blast stove Connected with second branch pipe, the other end of second bypass pipe in the coal gas be responsible for flowed into described second between valve or Connected between the air supervisor and the described second inflow valve with second branch pipe, second bypass pipe is provided with by the of second Port valve；One end of the second flue gas bypass pipe in second flue gas flow between valve and the hot-blast stove with second cigarette Tracheae is connected, and the other end of the second flue gas bypass pipe is responsible between second flue gas outflow valve and institute in the flue gas The connection of the second fume pipe is stated, the second flue gas bypass pipe is provided with the second flue gas by-passing valve；

On second branch pipe between the junction and the hot-blast stove of second branch pipe and second bypass pipe Provided with the second regulating valve, second branch pipe between second regulating valve and the hot-blast stove is provided with the second burning Valve；

Second cigarette between second fume pipe and the second flue gas bypass pipe junction and the hot-blast stove Tracheae is provided with the second flue gas shut-off valve.

10. the hot blast stove system of the blast furnace according to any one of claims 1 to 3, it is characterised in that the auxiliary combustion equipment bag The first combustion fan and the second combustion fan are included, first combustion fan is responsible for by the first air hose and the air to be connected Logical, second combustion fan is connected by the second air hose with air supervisor, and first air hose is provided with first Valve, second air hose is provided with the second valve.