Efficient flue gas combustion settling chamber

Abstract

The invention discloses an efficient flue gas combustion settling chamber which comprises a settling chamber body, a partition wall is arranged in the settling chamber body, and a combustion chamber and a settling chamber are formed on the two sides of the partition wall; a through hole is formed in the partition wall to communicate the combustion chamber with the settling chamber; smoke inlets are respectively formed in two opposite side walls of the combustion chamber; the combustion chamber is provided with a smoke inlet channel, the smoke inlet channel is connected with the two smoke inlets after being branched, and the smoke inlet channel is provided with an adjusting air door. At least one baffle is arranged in the settling chamber, so that at least two settling compartments which are communicated with each other are formed in the settling chamber, and an exhaust port is formed in the settling compartment farthest from the through hole in the partition wall; and the combustion chamber and the settling chamber are respectively provided with an explosion-proof door and a cleaning door. Combustible gas in flue gas can be fully combusted, the explosion risk is eliminated, and the dust removal efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial flue gas treatment, and particularly to an efficient flue gas combustion sedimentation chamber. Background Art

[0002] Electric furnaces are widely used in industries such as metallurgy, chemical engineering, and building materials. The flue gas emitted by them usually contains a large amount of high-temperature dust (30 g / m 3 ) and unburned combustible gas CO (content 14 - 28%). Usually, the flue gas treatment is pre-treated through a gravity sedimentation chamber, and the particulate matter settles to the bottom by its own weight to reduce the load on the subsequent dust removal equipment. However, due to the high flow rate of the electric furnace flue gas and the wide particle size distribution of the dust (including a large number of fine particles), most of the existing sedimentation chambers adopt a cuboid hollow design, and it is difficult to achieve an ideal dust removal effect simply relying on gravity sedimentation. On the other hand, if the CO in the flue gas is not burned out in time, it is extremely easy to accumulate in the sedimentation chamber or the equipment in the subsequent process to form an explosion hazard source, bringing great potential safety hazards to production safety. Therefore, there is an urgent need for an efficient sedimentation chamber with innovative structure, composite functions, coordinated dust removal and combustion, and good cleaning and explosion-proof capabilities to improve the safety and reliability of the electric furnace flue gas pre-treatment system. Summary of the Invention

[0003] To this end, the present invention provides an efficient flue gas combustion sedimentation chamber to solve the problems of poor dust removal effect and potential safety hazards caused by CO in the flue gas as described above.

[0004] To achieve the above object, the technical solutions provided by the present invention are as follows:

[0005] An efficient flue gas combustion sedimentation chamber, comprising a sedimentation chamber main body, wherein a partition wall is arranged inside the sedimentation chamber main body to form a combustion chamber and a sedimentation chamber on both sides of the partition wall; through holes are opened on the partition wall to communicate the combustion chamber and the sedimentation chamber; smoke inlets are respectively arranged on the two side walls opposite to the combustion chamber, so that the flue gas entering the combustion chamber from the two smoke inlets can collide against each other; the combustion chamber is configured with a smoke inlet passage, and after the smoke inlet passage branches, it is respectively connected to the two smoke inlets, and an adjusting air damper is arranged on the smoke inlet passage to be able to input air into the smoke inlet passage; at least one baffle is arranged inside the sedimentation chamber to form at least two mutually connected sedimentation compartments in the sedimentation chamber, and an exhaust port is arranged in the sedimentation compartment farthest from the through hole on the partition wall; explosion-proof doors are respectively arranged on the combustion chamber and the sedimentation chamber, and cleaning doors are respectively arranged on the combustion chamber and the sedimentation chamber.

[0006] Optionally, the through holes are located at the middle and lower positions of the partition wall.

[0007] Optionally, at least two baffles are arranged, and they are arranged at intervals and staggered, so that the air flow path inside the sedimentation chamber is in an S shape.

[0008] Optionally, the angle of the baffle can be adjusted.

[0009] Optionally, the explosion-proof doors are arranged at the top of the combustion chamber and at the top of each settling compartment.

[0010] Optionally, the explosion-proof door is set with a pressure threshold. When the pressure in the corresponding space exceeds the threshold, the explosion-proof door opens.

[0011] Optionally, the explosion-proof door is made of aluminum alloy or composite ceramics.

[0012] Optionally, the exhaust port is arranged at the top of the settling compartment.

[0013] Optionally, the outer walls, partition walls and baffles of the combustion chamber and the settling chamber are all composed of high-temperature resistant reinforced concrete and refractory materials.

[0014] Optionally, the cleaning door is made of high-temperature resistant steel and refractory materials.

[0015] Through the technical solution provided by the present invention, the following beneficial effects are achieved: by arranging the smoke inlets on both sides of the combustion chamber, the flue gas is in a head-on collision when entering the combustion chamber, the flue gas is violently mixed, and burns with oxygen in a high-temperature environment, eliminating the explosion hazard; through the arrangement of the partition wall and the baffle, the dust particles undergo inertial collision and settle under the action of gravity. In addition, the baffle can increase the gas flow path and extend the gas residence time, so that the dust particles can settle sufficiently, improving the dust removal efficiency. Description of the Drawings

[0016] Figure 1 is the top view of this embodiment;

[0017] Figure 2 is the side view of this embodiment without the smoke inlet channel shown;

[0018] Figure 3 is the schematic diagram of the partition wall in this embodiment.

[0019] Explanation of the reference numerals: 1. Main body of the settling chamber; 2. Combustion chamber; 21. Smoke inlet channel; 22. Adjusting air damper; 3. Settling chamber; 4. Settling compartment; 5. Partition wall; 51. Through hole; 6. Smoke inlet; 7. Baffle; 8. Explosion-proof door; 9. Cleaning door; 10. Exhaust port. Detailed Embodiment

[0020] To further illustrate the embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, mainly used to illustrate the embodiments and can be combined with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation manners.

[0022] Referring to Figures 1-3 , this embodiment provides an efficient flue gas combustion sedimentation chamber, including a sedimentation chamber main body 1. A partition wall 5 is arranged inside the sedimentation chamber main body 1 to form a combustion chamber 2 and a sedimentation chamber 3 on both sides of the partition wall 5. A through hole 51 is opened on the partition wall 5 to communicate the combustion chamber 2 and the sedimentation chamber 3. Smoke inlets 6 are respectively arranged on the two side walls opposite to the combustion chamber 2, so that the flue gas entering the combustion chamber 2 from the smoke inlets 6 can collide with each other. The combustion chamber 2 is configured with a smoke inlet passage 21. After the smoke inlet passage 21 branches, it is respectively connected to the two smoke inlets 6. An adjusting air damper 22 is arranged on the smoke inlet passage 21, which can input air into the smoke inlet passage 6 to ensure that there is enough oxygen in the combustion chamber 2 for combustion reaction. The adjusting air damper 22 is arranged at the position before the smoke inlet passage 21 branches and can adjust the air intake. At least one baffle 7 is arranged in the sedimentation chamber 3 to form at least two interconnected sedimentation compartments 4 in the sedimentation chamber 3. An exhaust port 10 is arranged in the sedimentation compartment 4 farthest from the through hole 51 on the partition wall 5. Explosion-proof doors 8 are respectively arranged on the combustion chamber 2 and the sedimentation chamber 3, and cleaning doors 9 are respectively arranged on the combustion chamber 2 and the sedimentation chamber 3.

[0023] The temperature of the flue gas generated by the electric furnace is usually between 600 - 1200 °C, containing a large amount of dust particles and combustible gases (such as CO). The smoke inlets 6 are arranged on the two side walls opposite to the combustion chamber 2, so that the high-temperature flue gas entering the combustion chamber 2 collides with each other. The combustible gases can fully react with oxygen and burn in the high-temperature environment, and the combustion rate of the combustible gases reaches more than 98%, which can greatly reduce the explosion risk. Some of the dust particles in the combustion chamber 2 will settle by themselves under the action of gravity, and the flue gas after combustion enters the sedimentation chamber 3 through the through hole 51 of the partition wall 5 and continues to settle; subsequently, under the action of the baffle 7, the flow path of the flue gas is increased, and the dust particles in the flue gas continue to settle under the action of inertial collision and gravity; in this way, the dust removal efficiency can be greatly improved.

[0024] Specifically, at least one through-hole 51 is provided on the partition wall 5. In this embodiment, two rows of through-holes 51 are provided, with three through-holes in each row, for a total of six through-holes. The cross-section of the through-hole 51 is a round hole, an oval hole or a rectangular hole. The size of the through-hole 51 is designed according to the actual flue gas flow rate. In addition, the through-hole 51 is located at the middle and lower part of the partition wall 5, so that the dust particles in the combustion chamber 2 need to settle a certain height before entering the settling chamber 3 through the through-hole 51; that is, before the flue gas enters the settling chamber 3 through the through-hole 51, most of the dust particles in the flue gas are blocked by the collision of the partition wall 5 and settle in the combustion chamber 2 under the action of gravity.

[0025] At least two baffles 7 are provided. The baffles 7 are arranged vertically and staggered at intervals, so that the air flow path in the settling chamber 3 is in an S shape. The number of the baffles 7 can be set according to the actual working conditions. For example, when the flue gas flow rate is large and the dust particle content is high, the number of the baffles 7 can be increased correspondingly. In this embodiment, the baffles 7 are arranged at intervals along the length direction of the settling chamber 3 and staggered along the width direction of the settling chamber 3, so as to divide the settling chamber 3 into a plurality of interconnected settling compartments 4, making the path of the flue gas in the settling chamber 3 longer and prolonging the residence time of the flue gas. Most of the dust particles settle on the ground under the dual action of the collision of the baffles 7 and their own gravity during the flow in the space, so as to achieve efficient settling of the dust in the flue gas. And, the exhaust port 10 is arranged at the top of the settling compartment 4. Since the dust particles are continuously settled under the action of gravity during the flow of the flue gas, arranging the tail gas at the top of the settling compartment 4 can minimize the dust particle content in the discharged flue gas.

[0026] Furthermore, explosion-proof doors 8 are arranged at the top of the combustion chamber 2 and each settling compartment 4. When the pressure in the combustion chamber 2 or the settling compartment 4 is too high, the explosion-proof doors 8 are opened to relieve the pressure, which can avoid equipment damage or explosion accidents. Specifically, the explosion-proof doors 8 are correspondingly provided with a pressure threshold. When the internal pressure of the space exceeds the pressure threshold, for example, when the pressure reaches 0.2 Mpa, the explosion-proof doors 8 in the corresponding space automatically open. The explosion-proof doors 8 can be made of lightweight high-temperature resistant materials, such as aluminum alloy or composite ceramics.

[0027] The angle of the baffle 7 can be adjusted. The rotating shaft of the baffle 7 is arranged vertically to adapt to different working conditions. For example, when the pressure in a certain settling compartment 4 is too high, by adjusting the angle of the baffle 7 adaptively, the corresponding space volume of the settling compartment 4 can be appropriately increased, and the space of another settling compartment 4 adjacent to the baffle 7 is correspondingly reduced, so that the pressure of the settling compartment 4 can be appropriately transferred to the adjacent settling compartment 4 without directly opening the explosion-proof door 8, reducing air pollution to the outside.

[0028] The combustion chamber 2 and the settling chamber 3 are respectively provided with cleaning doors 9. Since the particles in the flue gas will continuously deposit on the ground in the combustion chamber 2 and the settling chamber 3, therefore, through the arrangement of the cleaning doors 9, it is convenient for a forklift to enter and clean the deposited dust. At least two cleaning doors 9 can be arranged on the side wall of the settling chamber 3, so as to quickly clean different settling compartments 4 by entering through different cleaning doors. The cleaning doors 9 can be made of high-temperature resistant steel and refractory materials, and the refractory materials can be refractory ceramic fibers.

[0029] The outer walls, partition walls 5 and baffles 7 of the combustion chamber 2 and the settling chamber 3 are all composed of high-temperature resistant reinforced concrete and refractory materials. The refractory materials can be amorphous refractory castables, such as high-quality alumina.

[0030] The flue gas treatment process of this embodiment is as follows:

[0031] Flue gas entry: The flue gas generated by the circuit enters the combustion chamber 2 through the smoke inlets 6 on both sides.

[0032] Counter-jet combustion: Since the smoke inlets 6 are distributed on the opposite side walls of the combustion chamber 2, when the flue gas enters, it counter-jets and mixes violently. In a high-temperature environment, the combustible gas reacts fully with oxygen to complete combustion and reduce the explosion risk.

[0033] High-efficiency dust removal: The flue gas enters the settling chamber 3 through the through holes 51. Through the blocking of the partition wall 5 and the baffle 7, the dust particles in the flue gas are affected by the dual actions of inertial collision and gravity, and the dust particles settle on the ground of the combustion chamber 2 and the settling compartments 4.

[0034] Flue gas discharge: The flue gas after combustion and settling treatment is discharged from the exhaust port 10 and enters the subsequent treatment equipment for further waste heat utilization and purification.

[0035] Dust cleaning: After operating for a period of time, open the cleaning doors and use a forklift to clean the deposited flue gas dust.

[0036] Experiments show that the removal rate of dust with a particle size greater than 10 μm can reach more than 70%, and the removal rate of fine particles with a particle size of 1 - 10 μm reaches more than 50%. Applying the combustion settling chamber of the present invention to the 150-ton electric furnace flue gas treatment system of a certain steel plant, the flue gas flow rate of the electric furnace is 230,000 m 3 / h, the dust concentration is 30 g / m 3 , and the CO content is 18%. Through the treatment of the combustion settling chamber of the present invention, the dust concentration is reduced to 5 g / m 3 or less, and the CO content is reduced to 1% or less, meeting the operation requirements of the subsequent processes.

[0037] Although the present invention has been specifically shown and described in connection with preferred embodiments, those skilled in the art should understand that various changes in form and detail can be made to the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. An efficient flue gas combustion and sedimentation chamber, characterized in that: It includes a sedimentation chamber main body, and a partition wall is arranged inside the sedimentation chamber main body to form a combustion chamber and a sedimentation chamber on both sides of the partition wall; through holes are formed in the partition wall to communicate the combustion chamber and the sedimentation chamber; smoke inlets are respectively arranged on the two side walls opposite to the combustion chamber, so that the flue gas entering the combustion chamber from the two side smoke inlets can collide in a counter - impact manner; the combustion chamber is configured with a smoke inlet passage, the smoke inlet passage branches and is respectively connected to the two smoke inlets, and an adjusting damper is arranged in the smoke inlet passage to be able to input air into the smoke inlet passage; at least one baffle is arranged in the sedimentation chamber, so that the sedimentation chamber forms at least two interconnected sedimentation compartments, and an exhaust port is arranged in the sedimentation compartment farthest from the through hole on the partition wall; explosion - proof doors are respectively arranged on the combustion chamber and the sedimentation chamber, and cleaning doors are respectively arranged on the combustion chamber and the sedimentation chamber.

2. An efficient flue gas combustion sedimentation chamber according to claim 1, characterized in that: The through hole is located at the middle - lower part of the partition wall.

3. An efficient flue gas combustion sedimentation chamber according to claim 1, characterized in that: At least two baffles are arranged, and they are arranged at intervals and staggered, so that the air flow path in the sedimentation chamber is in an S - shape.

4. An efficient flue gas combustion sedimentation chamber according to claim 1, characterized in that: The angle of the baffle is adjustable.

5. An efficient flue gas combustion and sedimentation chamber according to claim 1, characterized in that: The explosion - proof doors are arranged on the top of the combustion chamber and the top of each sedimentation compartment.

6. The high-efficiency flue gas combustion sedimentation chamber according to claim 5, characterized in that: A pressure threshold is set for the explosion - proof door, and when the pressure in the corresponding space exceeds the threshold, the explosion - proof door opens.

7. An efficient flue gas combustion sedimentation chamber according to claim 1, characterized in that: The explosion - proof door is made of aluminum alloy or composite ceramics.

8. An efficient flue gas combustion and sedimentation chamber according to claim 1, characterized in that: The exhaust port is arranged on the top of the sedimentation compartment.

9. An efficient flue gas combustion sedimentation chamber according to claim 1, characterized in that: The outer walls, partition wall and baffles of the combustion chamber and the sedimentation chamber are all composed of high - temperature - resistant reinforced concrete and refractory materials.

10. An efficient flue gas combustion sedimentation chamber according to claim 1, characterized in that: The cleaning door is made of high - temperature - resistant steel and refractory materials.

Images