Gas-liquid mixer for fine dust removal of hydrogen-rich carbon circulating oxygen blast furnace gas
By designing a specific gas-liquid mixer in a hydrogen-rich carbon circulating oxygen blast furnace, the tooth-slit structure of the gas-liquid cover and the uplift pipe is used to achieve fine dust removal of gas dust, which solves the difficulty of reducing the top gas dust to ≤2mg/ The problem of m3 ensures gas quality and equipment stability.
Patent Information
- Application Number
- CN202420706407.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-08
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-08
AI Technical Summary
In the hydrogen-rich carbon circulating oxygen blast furnace, the top gas dust before CO2 removal is difficult to drop to ≤2mg/m3, which damages the presser rotor. The existing double-text dust removal system can only drop to 10mg/m3, which cannot meet the gas quality requirements.
Design a gas-liquid mixer with fine dust removal of hydrogen-rich carbon circulating oxygen blast furnace gas, adopts a coaxially set gas-liquid cover, uppipe and fixed link structure. There are tooth joints around the lower part of the gas-liquid cover, and the tooth joints are in a positive triangle shape. Arranged, a 'U-shaped fixed link is provided above the uplift pipe, combining the concave and protrusion table and the snap ring to form a stable gas-liquid mixing environment to ensure full contact between the gas and liquid.
Through this design, the dust in the gas can be reduced to ≤2mg/m3, meeting the quality requirements of the gas press, improving dust removal efficiency, and enhancing the stability and reliability of the equipment.
Smart Images
Figure CN222266568U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a gas-liquid mixer for fine dust removal of hydrogen-rich carbon circulating oxygen blast furnace gas. Background Art
[0002] After the hydrogen-rich carbon cycle oxygen blast furnace process adopts full oxygen blast, due to the change of the air supply system, the full oxygen blast causes a sharp decrease in the amount of gas in the blast furnace bosh after the nitrogen is reduced. At the same time, the theoretical combustion temperature of the tuyere vortex zone after the full oxygen blast is too high, causing the furnace to overheat. After the amount of gas in the bosh is reduced, the heat of the tuyere vortex zone cannot be brought into the upper part of the furnace body, resulting in insufficient thermodynamic conditions for the upper iron oxide and insufficient indirect reduction. Therefore, the oxygen blast furnace needs to adopt the top gas recycling, and the gas is heated and sprayed into the blast furnace from the tuyere and the furnace body. However, since the top gas contains about 30% CO2, after the gas containing CO2 is sprayed into the blast furnace, CO2 will react with the coke in the blast furnace to cause carbon melting loss, consuming part of the coke. Therefore, the CO2 in the gas needs to be removed before the top gas is heated and sprayed into the blast furnace. The removal of CO2 in the gas requires that the pressure of the pressure gas be increased under pressurized conditions, and then react with the NCMA solution and be absorbed by the NCMA solution. The pressure booster described here has high requirements on the quality of coal gas, especially the dust in the coal gas is required to be ≤2mg / m 3 Otherwise, the rotor of the compressor will be damaged. However, the Shuangwen dust removal system of the hydrogen-rich carbon circulating oxygen blast furnace can only reduce the dust in the coal gas to 10mg / m 3 Therefore, how to reduce the dust in the top gas before CO2 removal to ≤2mg / m 3 The following became a technical difficulty. Summary of the invention
[0003] In order to solve the technical problem of reducing the dust of the top gas to less than 2mg / m3 in the removal of CO2 in the coal gas of a hydrogen-rich carbon circulating oxygen blast furnace, the utility model provides a gas-liquid mixer for fine dust removal of the coal gas of a hydrogen-rich carbon circulating oxygen blast furnace.
[0004] The technical solution adopted by the present utility model is as follows: A gas-liquid mixer for fine dust removal in a hydrogen-rich carbon cycle oxygen blast furnace gas, characterized in that: a gas-liquid hood, a riser pipe and a fixed connecting rod are coaxially arranged. The gas-liquid hood is installed at the top of the riser pipe through the fixed connecting rod and is circular. A number of tooth slots are opened at the lower periphery of the gas-liquid hood. The gas-liquid hoods are evenly arranged in an equilateral triangle on the tray. Above the riser pipe, there is a "丿"-shaped fixed connecting rod. The lower end of the fixed connecting rod passes through the opening above the riser pipe and is firmly connected by welding. There are convex and concave platforms at the lower part of the riser pipe. The convex and concave platforms are installed in the round holes of the tray bottom plate by interference fit. The convex and concave platforms are provided with conical snap rings. There is an opening in the top cover of the gas-liquid hood. The threaded end of the "丿"-shaped fixed connecting rod passes through the central hole provided in the top cover of the gas-liquid hood. A blocking fastener is arranged inside, and a pressing fastener is arranged outside, and it is cooperated with a pre-tightening and sealing washer; The bottom of the riser pipe bends outwards to form a conical snap ring flange; The axial thickness of the conical snap ring flange is 5-8 mm, and the inclination angle is 10°-16°; The distance from the bottom of the tooth slot of the gas-liquid hood to the lower edge is 2-3 mm.
[0005] In the present utility model, the tooth slots of the gas-liquid hood do not extend to the bottom, and the bottom end is an integral structure, which can improve the strength of the tooth slots of the gas-liquid hood and fully ensure that the tooth slots of the gas-liquid hood will not deform during operation; The tooth slots of the gas-liquid hood are triangular, rectangular or trapezoidal. In the present utility model, a combination of rectangle + semi-circles at both ends is selected; The number of tooth slots of the gas-liquid hood is 32, and they are evenly distributed along the circumference of the gas-liquid hood; Further, the tooth slots of the gas-liquid hood adopt arc chamfers. The fixed connecting rod is composed of a "丿"-shaped screw rod. The lower part of the screw rod is connected to the upper part of the riser pipe. The screw rod passes through the round hole on the side wall of the riser pipe and is connected by welding. This structure is beneficial to ensuring the levelness of the gas-liquid hood and its stability during operation, and is also beneficial to ensuring a uniform annular space between the gas-liquid hood and the riser pipe. With this structure, the gas-liquid mixer is relatively firm and stable, can resist the large vibration caused by the impact and fragmentation of gas and liquid, and improves the full contact between the dust in the gas and the washing water. The fastener is a nut.
[0006] The structural characteristics of the present utility model are applicable to all existing gas-liquid mixers, with a wide application range, high reliability, and no increase in manufacturing cost, so as to solve the problems of uneven gas-liquid distribution and low dust removal efficiency existing in gas-liquid mixers. Brief Description of the Drawings
[0007] Figure 1 It is a schematic structural diagram of the gas-liquid mixer of the embodiment of the present utility model.
[0008] Figure 2 is Figure 1 The gas-liquid mixer distribution diagram shown.
[0009] The symbols in the figure are: 1-tower plate; 2-gas-liquid cover; 3-tooth gap; 4-riser pipe; 5-fixed connecting rod; 6-blocking fastener; 7-pressing fastener; 8-sealing ring; 9-conical clamping ring. Implementation
[0010] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings.
[0011] like Figure 1 , Figure 2 As shown, a gas-liquid mixer for fine dust removal of hydrogen-rich carbon circulating oxygen blast furnace gas comprises a tower plate 1, a gas-liquid cover 2 and a riser 4. A connecting circular hole is provided on the tower plate 1, a concave-convex platform is provided at the lower part of the riser, and the concave end of the concave-convex platform is installed in the connecting circular hole of the bottom plate of the tower plate, and is installed by interference fit. One end of the riser 4 passes through the connecting circular hole and is sealed and connected with a conical clamp ring provided, and the other end of the riser 4 extends into the gas-liquid cover 2 and passes through, and a circular hole is opened in the side wall to be welded and connected with a fixed connecting rod 5. The threaded end of the fixed connecting rod 5 passes through the central hole provided on the top cover of the gas-liquid cover, and a blocking fastener 6 is provided inside, and a pressing fastener 7 is provided outside, and is matched with a pre-tightening and sealing gasket 8. .
[0012] The working principle of the utility model is as follows: the coal gas enters the central tube 4 from the bottom end of the gas riser 4; the tooth gap 3 is immersed in the washing water to form a liquid seal, and the top of the gas riser 4 should be higher than the upper edge of the gas-liquid cover tooth gap 3 to prevent the washing water from leaking from it. When the rising dusty coal gas enters the liquid layer through the tooth gap 3, it is dispersed into many tiny bubbles or streams, forming a bubbling layer on the plate, providing a large number of interfaces for the uniform contact of the gas and liquid phases, and can reduce the top coal gas dust before CO2 removal to ≤2mg / m3, ensuring the quality requirements of the coal gas compressor for coal gas dust.
Claims
1. A gas-liquid mixer for fine dust removal of hydrogen-rich carbon circulating oxygen blast furnace gas, characterized by: A gas-liquid hood, a riser pipe and a fixed connecting rod are coaxially arranged. The gas-liquid hood is installed at the top of the riser pipe through the fixed connecting rod and is circular. A number of tooth slots are opened at the lower periphery of the gas-liquid hood. The gas-liquid hoods are evenly arranged in an equilateral triangle on the tray. Above the riser pipe, there is a "丿”-shaped fixed connecting rod. The lower end of the fixed connecting rod passes through the opening above the riser pipe and is firmly connected by welding. At the lower part of the riser pipe, there are convex and concave platforms which are installed in the round holes of the tray bottom plate by interference fit. The convex and concave platforms are provided with conical snap rings. There is an opening on the top cover of the gas-liquid hood. The threaded end of the "丿”-shaped fixed connecting rod passes through the central hole provided on the top cover of the gas-liquid hood. A blocking fastener is arranged inside and a pressing fastener is arranged outside, and they are cooperated with a pre-tightening and sealing washer; The bottom of the riser pipe bends outwards to form a conical snap ring flange; The axial thickness of the conical snap ring flange is 5-8 mm, and the inclination angle is 10°-16°; The distance from the bottom of the tooth slot of the gas-liquid hood to the lower edge is 2-3 mm.