Hot blast stove pipeline structure for blast furnace smelting and smoke exhaust method

Abstract

The invention discloses a hot blast stove pipeline structure for blast furnace smelting and a smoke exhaust method, relates to the field of blast furnace smelting, and solves the problems that an existing smoke exhaust method of a blast furnace smelting hot blast stove has large hidden danger to equipment and is high in cost. The pipeline structure comprises a flue gas treatment cavity communicating with the discharge end of the hot blast stove, the outlet end of the flue gas treatment cavity communicates with a heat exchanger, and a first outlet of the heat exchanger communicates with a discharge pipeline used for discharging treated gas. The smoke discharging method comprises the following steps that smoke generated after the hot blast stove is burnt is provided, the smoke is introduced into the smoke treatment cavity through the discharging end of the hot blast stove, the smoke treatment cavity conducts primary treatment on the smoke, and the smoke obtained after primary treatment is obtained; opening the outlet end of the flue gas treatment cavity, introducing the primarily treated flue gas into a heat exchanger, and starting the heat exchanger to further treat the flue gas to obtain treated gas; and opening a first outlet of the heat exchanger, introducing the treated gas into a discharge pipeline, and discharging the gas through the discharge pipeline.

Description

Technical Field

[0001] The invention relates to the field of blast furnace smelting, and in particular to a hot blast furnace pipeline structure for blast furnace smelting and a smoke exhaust method. Background Art

[0002] During blast furnace smelting, the exhaust of flue gas after the hot blast furnace is an issue that enterprises need to consider carefully. In the existing technology, the chimney negative pressure siphon is basically used in conjunction with the induced draft fan to jointly exhaust the flue gas into the atmosphere. However, due to the intervention of the induced draft fan during smoke exhaust, the flue gas flow rate is too fast when passing through the heat exchanger, the heat exchanger as a whole vibrates greatly, causing great hidden dangers to the equipment, and the overall equipment cost is high.

[0003] It can be seen that the existing smoke exhaust method for blast furnace smelting hot blast stove has the defects of posing great hidden dangers to equipment and high cost. Summary of the invention

[0004] The invention aims to solve the problem that the existing smoke exhaust method of a blast furnace smelting hot blast stove has great hidden dangers to the equipment and is high in cost.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A hot blast furnace pipeline structure for blast furnace smelting, the pipeline structure includes a flue gas treatment chamber connected to the hot blast furnace exhaust end, the outlet end of the flue gas treatment chamber is connected to a heat exchanger, the first outlet of the heat exchanger is connected to an exhaust pipe, and the exhaust pipe is used to discharge the treated gas.

[0007] Furthermore, a gas processing device is provided in the flue gas processing chamber, and the gas processing device is used to filter and remove impurities from the flue gas.

[0008] Furthermore, the second outlet of the heat exchanger is connected to the bypass pipeline.

[0009] Furthermore, the bypass pipeline is used to recycle the treated gas and discharge it into other devices for gas recycling.

[0010] The present invention also provides a fume exhaust method for a blast furnace smelting hot blast stove, comprising the following steps:

[0011] S1. providing flue gas after burning in a hot blast furnace, introducing the flue gas into a flue gas treatment chamber through an exhaust end of the hot blast furnace, and performing preliminary treatment on the flue gas in the flue gas treatment chamber to obtain preliminarily treated flue gas;

[0012] S2. Open the outlet of the flue gas treatment chamber, introduce the initially treated flue gas into the heat exchanger, and start the heat exchanger to further treat the flue gas to obtain treated gas;

[0013] S3. Open the first outlet of the heat exchanger to introduce the treated gas into the exhaust pipe, and the exhaust pipe exhausts the gas.

[0014] Furthermore, S2 also includes opening the second outlet of the heat exchanger to introduce part of the processed gas into the bypass pipeline through the second outlet.

[0015] Furthermore, the bypass pipeline is used to recycle the treated gas and discharge it into other devices for gas recycling.

[0016] Furthermore, the S1 also includes starting a gas treatment device in the flue gas treatment chamber to filter and remove impurities from the flue gas.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] 1. The hot blast furnace pipeline structure for blast furnace smelting involved in the present invention introduces the flue gas after the hot blast furnace is burned into the flue gas treatment chamber through the exhaust end of the hot blast furnace, the flue gas treatment chamber performs initial treatment on the flue gas to obtain the initially treated flue gas, the outlet end of the flue gas treatment chamber is opened, the initially treated flue gas is introduced into the heat exchanger, the heat exchanger is opened to further treat the flue gas to obtain the treated gas; the first outlet of the heat exchanger is opened, the treated gas is introduced into the exhaust pipe, and the exhaust pipe discharges the gas. The treatment and discharge of the flue gas after the hot blast furnace is burned is realized, and no induced draft fan is set in the pipeline system, which avoids the excessively fast flow rate of the flue gas after the induced draft is introduced and the heat exchanger as a whole generates a large vibration, which causes a large hidden danger to the equipment. The overall pipeline is simple, the equipment is simple to operate, the cost is low, and it is easy to be widely used. The existing exhaust method of the hot blast furnace for blast furnace smelting solves the problem that the equipment has a large hidden danger and high cost.

[0019] 2. The smoke exhaust method for a blast furnace smelting hot blast stove involved in the present invention is simple, low-cost, and easy to operate the process equipment. More importantly, it can also filter, remove impurities and recycle the smoke, further saving energy and reducing production costs, and has strong advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the hot blast furnace pipeline structure for blast furnace smelting.

[0021] 1-hot blast furnace, 2-discharge end of hot blast furnace, 3-smoke treatment chamber, 4-gas treatment device, 5-export end of smoke treatment chamber, 6-heat exchanger, 7-bypass pipeline, 8-first outlet, 9-discharge pipeline, 10-second outlet.

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. DETAILED DESCRIPTION

[0024] In the embodiments of the present invention, please refer to Figure 1 , provides a hot blast furnace pipeline structure for blast furnace smelting, the pipeline structure includes a flue gas treatment chamber 3 connected to the hot blast furnace exhaust end 2, the outlet end 5 of the flue gas treatment chamber is connected to the heat exchanger 6, the first outlet 8 of the heat exchanger 6 is connected to the exhaust pipe 9, and the exhaust pipe 9 is used to discharge the treated gas.

[0025] It can be understood that the flue gas after the hot blast furnace 1 is burned is introduced into the flue gas treatment chamber 3 through the hot blast furnace discharge end 2, the flue gas treatment chamber 3 performs preliminary treatment on the flue gas to obtain the pre-treated flue gas, the outlet end 5 of the flue gas treatment chamber is opened, the pre-treated flue gas is introduced into the heat exchanger 6, the heat exchanger 6 is opened to further treat the flue gas to obtain the treated gas; the first outlet 8 of the heat exchanger 6 is opened, the treated gas is introduced into the discharge pipe 9, and the discharge pipe 9 discharges the gas. The treatment and discharge of the flue gas after the hot blast furnace 1 is burned is realized, and no induced draft fan is set in the pipeline system, which avoids the excessively fast flow rate of the flue gas after the induced draft is introduced, and the heat exchanger 6 as a whole generates a large vibration when passing through the heat exchanger 6, which causes a large hidden danger to the equipment, and the overall pipeline is simple, the equipment is simple to operate, the cost is low, and it is easy to be widely used. The existing exhaust method of the blast furnace smelting hot blast furnace 1 solves the problem that the equipment has a large hidden danger and high cost.

[0026] In certain embodiments of the present invention, please continue to refer to Figure 1 A gas processing device 4 is provided in the flue gas processing chamber 3, and the gas processing device 4 is used to filter and remove impurities from the flue gas.

[0027] In certain embodiments of the present invention, please continue to refer to Figure 1 The second outlet 10 of the heat exchanger 6 is connected to the bypass pipeline 7 .

[0028] In certain embodiments of the present invention, please continue to refer to Figure 1 The bypass pipeline 7 is used to recycle the treated gas and discharge it into other devices for gas recycling.

[0029] In certain embodiments of the present invention, a method for exhausting smoke from a blast furnace smelting hot blast stove 1 is also provided, comprising the following steps:

[0030] S1, providing flue gas after burning in a hot blast furnace 1, introducing the flue gas into a flue gas treatment chamber 3 through the hot blast furnace discharge end 2, and performing preliminary treatment on the flue gas in the flue gas treatment chamber 3 to obtain preliminarily treated flue gas;

[0031] S2, opening the outlet end 5 of the flue gas treatment chamber, introducing the initially treated flue gas into the heat exchanger 6, and opening the heat exchanger 6 to further treat the flue gas to obtain treated gas;

[0032] S3, opening the first outlet 8 of the heat exchanger 6, introducing the treated gas into the exhaust pipe 9, and the exhaust pipe 9 exhausts the gas.

[0033] It can be understood that the method is simple, low-cost, and the process equipment is easy to operate. More importantly, it can also filter, remove impurities and recycle the flue gas, further saving energy and reducing production costs, and has strong advantages.

[0034] In certain embodiments of the present invention, S2 further includes opening the second outlet 10 of the heat exchanger 6 and introducing part of the treated gas into the bypass pipeline 7 through the second outlet 10 .

[0035] In certain embodiments of the present invention, the bypass line 7 is used to recycle the treated gas and discharge it into other devices for gas recycling.

[0036] In certain embodiments of the present invention, S1 further includes starting the gas treatment device 4 in the flue gas treatment chamber 3 to filter and remove impurities from the flue gas.

[0037] Example 1

[0038] In this embodiment, a blast furnace in Desheng Iron and Steel Plant uses a hot blast furnace pipeline structure for blast furnace smelting. Figure 1 The pipeline structure includes a flue gas treatment chamber 3 connected to the hot blast furnace discharge end 2, the outlet end 5 of the flue gas treatment chamber is connected to the heat exchanger 6, the first outlet 8 of the heat exchanger 6 is connected to the discharge pipe 9, and the discharge pipe 9 is used to discharge the treated gas. A gas treatment device 4 is provided in the flue gas treatment chamber 3, and the gas treatment device 4 is used to filter and remove impurities from the flue gas. The second outlet 10 of the heat exchanger 6 is connected to the bypass pipe 7. The bypass pipe 7 is used to recycle the treated gas and discharge it into other devices to recycle the gas.

[0039] The above-mentioned pipeline is used to exhaust smoke. The specific smoke exhaust method includes the following steps:

[0040] S1, providing flue gas after burning in a hot blast furnace 1, introducing the flue gas into a flue gas treatment chamber 3 through the hot blast furnace discharge end 2, the flue gas treatment chamber 3 performs preliminary treatment on the flue gas, and opening a gas treatment device 4 in the flue gas treatment chamber 3 to filter and remove impurities from the flue gas to obtain preliminarily treated flue gas;

[0041] S2, open the outlet end 5 of the flue gas treatment chamber, introduce the initially treated flue gas into the heat exchanger 6, open the heat exchanger 6 to further treat the flue gas to obtain treated gas; open the second outlet 10 of the heat exchanger 6, and introduce part of the treated gas into the bypass pipeline 7 through the second outlet 10. The bypass pipeline 7 is used to recycle the treated gas and discharge it into other devices to recycle the gas.

[0042] S3, opening the first outlet 8 of the heat exchanger 6, introducing the treated gas into the exhaust pipe 9, and the exhaust pipe 9 exhausts the gas.

[0043] Example 2

[0044] Another blast furnace at Desheng Iron and Steel Plant uses a conventional commercially available smoke exhaust pipeline structure and smoke exhaust method to exhaust the flue gas after the hot blast furnace is burned.

[0045] By tracking the operation of the blast furnace hot blast stove system of Example 1 and Example 2 and recording the operation status, it was found that the vibration of the preheater of Example 1 was significantly alleviated after one week, and the furnace burning efficiency remained almost unchanged.

[0046] And embodiment 1 can directly reduce the cost as follows: 250Kw*24h*0.5 yuan / Kwh=3000 yuan, and the monthly electricity cost saving is 3000 yuan*30=90,000 yuan.

[0047] In summary, by comparing Example 1 and Example 2, it can be seen that the smoke exhaust method of the present invention can avoid the situation that after the induced draft is introduced, the smoke flow rate is too fast and passes through the heat exchanger, causing the heat exchanger as a whole to vibrate greatly, which causes great hidden dangers to the equipment. In addition, the overall pipeline is simple, the equipment operation is simple, the cost is low, and it is easy to be widely used. The existing smoke exhaust method of the blast furnace smelting hot blast furnace has great hidden dangers to the equipment and high cost.

[0048] The above embodiment is only one implementation of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A hot blast furnace pipeline structure for blast furnace smelting, characterized in that: The pipeline structure includes a flue gas treatment chamber connected to the exhaust end of the hot blast furnace, the outlet end of the flue gas treatment chamber is connected to a heat exchanger, a first outlet of the heat exchanger is connected to an exhaust pipe, and the exhaust pipe is used to discharge the treated gas.

2. The hot blast stove pipeline structure for blast furnace smelting according to claim 1, characterized in that: A gas processing device is provided in the flue gas processing chamber, and the gas processing device is used to filter and remove impurities from the flue gas.

3. The hot blast stove pipeline structure for blast furnace smelting according to claim 2, characterized in that: The second outlet of the heat exchanger is connected to the bypass pipeline.

4. A hot blast stove pipeline structure for blast furnace smelting according to claim 3, characterized in that: The bypass pipeline is used to recycle the treated gas and discharge it into other devices to recycle the gas.

5. A smoke exhaust method for a blast furnace smelting hot blast stove according to claim 4, characterized in that: The following steps are involved: S1. providing flue gas after burning in a hot blast furnace, introducing the flue gas into a flue gas treatment chamber through an exhaust end of the hot blast furnace, and performing preliminary treatment on the flue gas in the flue gas treatment chamber to obtain preliminarily treated flue gas; S2. Open the outlet of the flue gas treatment chamber, introduce the initially treated flue gas into the heat exchanger, and start the heat exchanger to further treat the flue gas to obtain treated gas; S3, opening the first outlet of the heat exchanger, introducing the treated gas into the exhaust pipe, and the exhaust pipe exhausts the gas.

6. The smoke exhaust method for a hot blast stove for blast furnace smelting according to claim 5, characterized in that: The S2 also includes opening the second outlet of the heat exchanger and introducing part of the processed gas into the bypass pipeline through the second outlet.

7. The smoke exhaust method for a hot blast stove for blast furnace smelting according to claim 6, characterized in that: The bypass pipeline is used to recycle the treated gas and discharge it into other devices to recycle the gas.

8. The smoke exhaust method for a hot blast stove for blast furnace smelting according to claim 5, characterized in that: The S1 also includes starting the gas treatment device in the flue gas treatment chamber to filter and remove impurities from the flue gas.

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