Flue gas dust removal and denitration all-in-one machine for blast furnace hot blast stove

Abstract

The utility model relates to the technical field of hot blast stoves, in particular to a blast furnace hot blast stove flue gas dust removal and denitration all-in-one machine which comprises a dust removal section and a denitration section, a flue gas inlet is formed in one side of the dust removal section, a flue gas outlet is formed in the top end of the denitration section, and two flue gas inlet pipes are fixedly installed between the top end of the dust removal section and the bottom of the denitration section. The dust removal section comprises a plurality of dust removal bins communicated with one end of the flue gas inlet pipe, guide plates are fixedly mounted in the dust removal bins, dust removal ash hoppers are arranged at the bottom ends of the dust removal bins, a plurality of filter bags are fixedly mounted at the top ends in the dust removal bins, and the tops of the dust removal bins are communicated with a gas purification chamber. Flue gas at an outlet of a blast furnace hot blast stove enters the dust removal bin, the flue gas is uniformly distributed by the guide plate and then enters the dust removal ash hoppers, particles such as dust in the flue gas are filtered by the filter bag, the collected flue gas enters the denitration section through the flue gas inlet pipe for denitration, and finally the flue gas is discharged into the atmosphere through the flue gas outlet. Pollutant emission of flue gas of the blast furnace hot blast stove is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of hot blast stove technology, and in particular to an integrated dust removal and denitrification machine for blast furnace hot blast stove flue gas. Background Technology

[0002] Dust removal and denitrification of blast furnace hot blast stove flue gas is an important part of environmental protection in the steel industry. The goal is to reduce the emission of particulate matter and nitrogen oxides in the flue gas to meet environmental protection requirements. In order to achieve dust removal and denitrification at the same time, integrated technology can be adopted. Currently, three-dimensional electrostatic precipitator-bag filter combined with SCR denitrification can reduce pollutant emissions from blast furnace hot blast stove flue gas.

[0003] In the prior art, such as the patent with publication number CN215962716U, a deep desulfurization, denitrification and dust removal tower for flue gas treatment is disclosed, including a dust removal tower. A flue gas inlet pipe is installed at the lower end of one side of the dust removal tower. A flue gas discharge assembly is installed in the middle of the interior of the dust removal tower. Multiple flue gas discharge assemblies are connected through the flue gas inlet pipe. The flue gas discharge assembly includes a flue gas connecting pipe, a flue gas flow ring pipe and a flue gas discharge nozzle. The flue gas connecting pipe is located in a cross direction inside the flue gas flow ring pipe, and the flue gas discharge nozzle is arranged in a ring array inside the flue gas flow ring pipe.

[0004] The above structure solves the problem that dust will enter the flue gas in the dust removal tower when it enters the desulfurization and denitrification steps. However, the dust removal and denitrification efficiency is low during the dust removal and denitrification process of the blast furnace hot blast stove flue gas, which easily leads to the emission of pollutants from the flue gas not meeting the standards. Utility Model Content

[0005] In view of this, the purpose of this utility model is to propose an integrated dust removal and denitrification machine for blast furnace hot blast stove flue gas, so as to solve the problem of low dust removal and denitrification efficiency during the dust removal and denitrification process of blast furnace hot blast stove flue gas, resulting in the failure of flue gas pollutant emissions to meet standards.

[0006] To achieve the above objectives, this utility model provides an integrated dust removal and denitrification machine for blast furnace hot blast stove flue gas, including a dust removal section and a denitrification section. The denitrification section is located at the top of the dust removal section. A flue gas inlet for blast furnace hot blast stove flue gas is opened on one side of the dust removal section. A flue gas outlet is opened at the top of the denitrification section. Two sets of flue gas inlet pipes are fixedly installed between the top of the dust removal section and the bottom of the denitrification section.

[0007] The dust removal section includes multiple dust removal chambers connected to one end of the flue gas inlet pipe. The multiple dust removal chambers are interconnected, and each of the multiple dust removal chambers has a baffle plate fixedly installed inside. A dust hopper is provided at the bottom of the dust removal chamber. Multiple filter bags are fixedly installed at the top of the dust removal chamber. A clean air chamber is connected to the top of the dust removal chamber. Multiple air-bag pulse valves are provided at the top of the clean air chamber. The outlet of the air-bag pulse valves is located inside the dust removal chamber.

[0008] Preferably, the denitrification section includes two sets of denitrification chambers connected to the other end of the flue gas inlet pipe, the flue gas inlet pipe is surrounded by atomizing spray guns, and the denitrification chambers are equipped with catalysts.

[0009] Both sets of denitrification chambers are fixedly equipped with flow straightening grids at their top ends, and one side of the flow straightening grids is connected to the flue gas outlet.

[0010] Preferably, at least eight dust collection chambers are provided, with four dust collection chambers corresponding to a group of denitrification chambers.

[0011] Preferably, the atomizing spray gun is provided with a denitrification reducing agent inside, and the atomizing spray gun is distributed around the inlet of the flue gas inlet pipe.

[0012] Preferably, both the dust removal chamber and the denitrification chamber are arranged vertically, and the flue gas inlet pipe connects the dust removal chamber and the denitrification chamber.

[0013] Preferably, the outlet end of the air-bag pulse valve corresponds to the outside of the filter bag, and all filter bags are cylindrical structures.

[0014] Preferably, the catalyst is provided in two sets, which are arranged vertically and parallel to each other inside the denitrification chamber.

[0015] The beneficial effects of this utility model are:

[0016] The flue gas from the blast furnace hot blast stove outlet enters the dust removal section through the flue gas inlet. The flue gas in the flue gas inlet enters the dust removal chamber, and after being evenly distributed by the guide plate, it enters each dust removal hopper. Dust and other particulate matter in the flue gas are filtered by the filter bags. The rectified and collected flue gas then enters the denitrification section through the flue gas inlet pipe for denitrification, and finally is discharged into the atmosphere through the flue gas outlet. This improves the dust removal and denitrification efficiency and effectively reduces the pollutant emissions from the blast furnace hot blast stove flue gas. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the entire utility model;

[0019] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the present invention.

[0020] Figure 3 This is a side view of the overall structure of this utility model.

[0021] The following are marked in the diagram: 1. Baffle plate; 2. Dust hopper; 3. Flue gas inlet; 4. Filter bag; 5. Air manifold pulse valve; 6. Clean air chamber; 7. Flue gas inlet pipe; 8. Atomizing spray gun; 9. Catalyst; 10. Rectifying grid; 11. Flue gas outlet; 12. Dust collection bin; 13. Denitrification bin. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, a blast furnace hot blast stove flue gas dust removal and denitrification integrated machine includes a dust removal section and a denitrification section. The denitrification section is located at the top of the dust removal section. A flue gas inlet 3 for the blast furnace hot blast stove flue gas to enter is opened on one side of the dust removal section. A flue gas outlet 11 is opened at the top of the denitrification section. Two sets of flue gas inlet pipes 7 are fixedly installed between the top of the dust removal section and the bottom of the denitrification section.

[0024] The dust removal section includes multiple dust removal chambers 12 connected to one end of the flue gas inlet pipe 7. The multiple dust removal chambers 12 are interconnected, and each of the multiple dust removal chambers 12 has a baffle plate 1 fixedly installed inside. The bottom of the dust removal chamber 12 is provided with a dust hopper 2. Multiple filter bags 4 are fixedly installed inside the top of the dust removal chamber 12. The top of the dust removal chamber 12 is connected to a clean air chamber 6. The top of the clean air chamber 6 is provided with multiple air bag pulse valves 5. The outlet of the air bag pulse valves 5 is located inside the dust removal chamber 12.

[0025] In this embodiment, the flue gas from the blast furnace hot blast stove outlet enters the dust removal section through the flue gas inlet 3. The flue gas in the flue gas inlet 3 enters the dust removal chamber 12, and after being evenly distributed by the guide plate 1, it enters each dust removal hopper 2. Dust and other particulate matter in the flue gas are filtered by the filter bags 4. The dust layer on the outside of the filter bags 4 falls into the dust removal hopper 2 after being back-blown by the air manifold pulse valve 5. The clean flue gas enters the clean air chamber 6, and the rectified and collected flue gas then enters the denitrification section through the flue gas inlet pipe 7 for denitrification. Finally, it is discharged into the atmosphere through the flue gas outlet 11. The dust removal and denitrification are integrated, which effectively reduces the pollutant emissions from the blast furnace hot blast stove flue gas.

[0026] As one implementation method, such as Figure 1 , Figure 2 and Figure 3 As shown, the denitrification section includes two sets of denitrification chambers 13 connected to the other end of the flue gas inlet pipe 7. Atomizing spray guns 8 are arranged around the flue gas inlet pipe 7, and catalysts 9 are arranged inside the denitrification chambers 13.

[0027] Both sets of denitrification chambers 13 are fixedly installed with a flow straightening grid 10 at the top, and one side of the flow straightening grid 10 is connected to the flue gas outlet 11.

[0028] In this embodiment, the rectified flue gas enters the denitrification chamber 13 in the denitrification section through the flue gas inlet pipe 7. At the same time, since an atomizing spray gun 8 is installed at the flue gas inlet pipe 7, a denitrification reducing agent is sprayed in. The reducing agent and the flue gas pass through a two-stage catalyst 9 together to remove nitrogen oxides, decompose the nitrogen oxides into nitrogen and water to complete the denitrification. After denitrification, the flue gas is guided to flow in a predetermined direction by the rectifier grid 10, and finally discharged into the atmosphere through the flue gas outlet 11.

[0029] As one implementation method, such as Figure 3 As shown, there are at least eight dust removal chambers 12, of which four dust removal chambers 12 correspond to a set of denitrification chambers 13.

[0030] In this embodiment, the dust removal section consists of 8 dust removal chambers 12 arranged side by side, with 4 dust removal chambers 12 corresponding to 1 denitrification chamber 13, which improves the efficiency of zoned dust removal and denitrification and avoids the flue gas from becoming disordered inside.

[0031] As one implementation method, such as Figure 2 and Figure 3 As shown, the atomizing spray gun 8 is equipped with a denitrification reducing agent inside, and the atomizing spray gun 8 is distributed around the inlet of the flue gas inlet pipe 7.

[0032] In this embodiment, a denitrification reducing agent is sprayed in using an atomizing spray gun 8. The reducing agent reacts with the flue gas to perform preliminary denitrification.

[0033] As one implementation method, such as Figure 2 As shown, both the dust removal chamber 12 and the denitrification chamber 13 are arranged vertically, and the flue gas inlet pipe 7 connects the dust removal chamber 12 and the denitrification chamber 13.

[0034] In this embodiment, the vertical arrangement of the dust removal chamber 12 and the denitrification chamber 13 results in a compact structure, a small footprint, and facilitates the overall flow of flue gas from bottom to top, enabling integrated dust removal and denitrification and effectively reducing pollutant emissions from the blast furnace hot blast stove flue gas.

[0035] As one implementation method, such as Figure 2 As shown, the air outlet of the air-bag pulse valve 5 corresponds to the outside of the filter bag 4, and the filter bags 4 are all cylindrical structures.

[0036] In this embodiment, the dust layer on the outside of the filter bag 4 falls into the dust hopper 2 after being back-blown by the air bag pulse valve 5. The dust in the dust hopper 2 is discharged manually or mechanically, which is convenient for repeated use.

[0037] As one implementation method, such as Figure 2 and Figure 3 As shown, there are two sets of catalyst 9, which are arranged vertically and horizontally inside the denitrification chamber 13.

[0038] In this embodiment, after dust removal, the flue gas enters the denitrification chamber 13 through the flue gas inlet pipe 7. Since the denitrification reducing agent is sprayed in the flue gas inlet pipe 7, the reducing agent and the flue gas pass through the two-stage catalyst 9 together in the denitrification chamber 13 for denitrification, thereby improving the denitrification efficiency.

[0039] Working principle: During use, the flue gas from the hot blast stove outlet enters the dust removal section through the flue gas inlet 3. The flue gas in the flue gas inlet 3 enters the dust removal bin 12. After the flue gas is evenly distributed by the guide plate 1, it enters each dust removal hopper 2. The dust and other particulate matter in the flue gas are filtered by the filter bag 4. The dust layer on the outside of the filter bag 4 falls into the dust removal hopper 2 after being back-blown by the air manifold pulse valve 5. The ash in the dust removal hopper 2 is discharged manually or mechanically. The clean flue gas enters the clean air chamber 6.

[0040] After rectification and aggregation, the flue gas enters the denitrification chamber 13 in the denitrification section through the flue gas inlet pipe 7. At the same time, due to the atomizing spray gun 8 installed at the flue gas inlet pipe 7, the denitrification reducing agent is sprayed in. The reducing agent and the flue gas pass through the two-stage catalyst 9 together to remove nitrogen oxides, decompose the nitrogen oxides into nitrogen and water to complete the denitrification. After purification, the flue gas uses the rectifier grid 10 to make the flue gas velocity distribution more uniform, and guides the gas to flow in a predetermined direction. Finally, it is discharged into the atmosphere through the flue gas outlet 11.

[0041] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0042] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A blast furnace hot blast stove flue gas dedusting and denitration integrated machine, comprising a dedusting section and a denitration section, the denitration section is arranged at the top of the dedusting section, a flue gas inlet (3) for the blast furnace hot blast stove flue gas to enter is arranged on one side of the dedusting section, a flue gas outlet (11) is arranged at the top end of the denitration section, characterized in that, Two groups of flue gas inlet pipes (7) are fixedly installed between the top end of the dedusting section and the bottom of the denitration section; The dedusting section includes a plurality of dedusting bins (12) in communication with one end of the flue gas inlet pipe (7), the plurality of dedusting bins (12) are in communication with each other, the inside of each of the plurality of dedusting bins (12) is fixedly installed with a flow guide plate (1), the bottom end of the dedusting bin (12) is provided with a dedusting ash bin (2), the inside top end of the dedusting bin (12) is fixedly installed with a plurality of filter bags (4), and the top of the dedusting bin (12) is in communication with a clean gas chamber (6), the top of the clean gas chamber (6) is provided with a plurality of gas bag pulse valves (5), and the gas outlet end of the gas bag pulse valve (5) is located in the dedusting bin (12).

2. The blast furnace hot blast stove flue gas dedusting and denitration integrated machine according to claim 1, characterized in that, The denitration section includes two groups of denitration bins (13) in communication with the other end of the flue gas inlet pipe (7), the periphery of the flue gas inlet pipe (7) is provided with an atomizing spray gun (8), and the inside of the denitration bin (13) is provided with a catalyst (9); The top end of each of the two groups of denitration bins (13) is fixedly installed with a flow regulation grid (10), one side of the flow regulation grid (10) is in communication with a flue gas outlet (11).

3. The blast furnace hot blast stove flue gas dedusting and denitration integrated machine according to claim 2, characterized in that, The dedusting bin (12) is provided with at least eight dedusting bins (12), and four dedusting bins (12) correspond to one group of denitration bins (13) respectively.

4. The blast furnace hot blast stove flue gas dedusting and denitration integrated machine according to claim 2, characterized in that, The inside of the atomizing spray gun (8) is provided with a denitration reducing agent, and the atomizing spray gun (8) is distributed around the inlet of the flue gas inlet pipe (7).

5. The blast furnace hot blast stove flue gas dedusting and denitration integrated machine according to claim 2, characterized in that, The dedusting bin (12) and the denitration bin (13) are vertically arranged, and the flue gas inlet pipe (7) is in communication with the dedusting bin (12) and the denitration bin (13).

6. The blast furnace hot blast stove flue gas dedusting and denitration integrated machine according to claim 1, characterized in that, The gas outlet end of the gas bag pulse valve (5) corresponds to the outside of the filter bag (4), and the filter bag (4) is in a cylindrical structure.

7. The blast furnace hot blast stove flue gas dedusting and denitration integrated machine according to claim 2, characterized in that, The catalyst (9) is provided with two groups, and the two groups of catalysts (9) are arranged in parallel on the inside of the denitration bin (13).

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