Spherification tubing transport deoxygenation apparatus and method of use

Abstract

The application discloses a spherical pipeline transportation oxygen-removing device based on a two-step method for removing oxygen filled in the gaps between spheres, which comprises an upper connecting pipe, a separation cylinder, a bottom conical cylinder, an outer conical cylinder, a gas collecting pipe, an inner conical cylinder, a middle conical cylinder and a lower connecting pipe. The inner diameter of the separation cylinder is 1.5-2 times of the inner diameter of the transportation pipe, the top ring plate is uniformly provided with air exhaust holes, the height of the top cavity is 1-2 times of the inner diameter of the transportation pipe, the negative pressure of the top cavity is-20 Pa to-60 Pa, the height of the top cavity of the inner conical cylinder is 1-2 times of the inner diameter of the transportation pipe, and the air blower sucks the main filled oxygen after the balloon separation of the top cavity of the separation cylinder. 50% clean gas passes through the side plate of the bottom conical cylinder to form a plane flow to drive the remaining filled oxygen near the wall, and the remaining 50% clean gas forms a collection bath in the top cavity of the inner conical cylinder to drive the remaining filled oxygen in the center. The spherical safe transportation device of a steel enterprise can use the application. The invented spherical pipeline transportation is safe, the static pressure distribution is stable, there is no deflagration, and the filled oxygen is not carried into a smelting furnace.

Description

TECHNICAL FIELD

[0001] The application relates to a ball pipeline transport oxygen removal device with the technical features of two-step driving out filling oxygen, reverse pumping of main filling oxygen after balloon separation, combination of plane flow and convergence flow, and reverse driving of residual filling oxygen, and is suitable for ball safe transport smelting devices in the process industry field. BACKGROUND

[0002] Hydrogen reduction metallurgy replaces carbon reduction metallurgy, and after high-temperature pellets are discharged from a pellet shaft furnace, smoke gas containing a certain amount of oxygen molecules is brought along a pipeline into a hydrogen reduction shaft furnace.

[0003] Hydrogen molecules have the fastest movement speed, so they have the largest diffusion degree and very high thermal conductivity, and the thermal conductivity is seven times that of air. H2 has very strong reduction, and at high temperatures, H2 can take oxygen, phosphorus, sulfur, nitrogen, chlorine, carbon and the like from many compounds to reduce the compounds. Due to this characteristic, H2 can be used as a reducing agent in the steel smelting field. Compared with traditional carbon metallurgy, hydrogen metallurgy can reduce CO2 emissions from the source. Hydrogen metallurgy uses H2 to replace carbon as a reducing agent and energy source for ironmaking, and the reduction product is water, which can achieve zero carbon emission (Fe2O3+3H2=2Fe+3H2O). However, H2 has very small ignition energy and is easy to ignite, and even a small electrostatic spark can easily ignite. The flammable range of H2 in air (20℃, 101.325kPa) is 4-74.5%. The flammable range of hydrogen in oxygen (20℃, 101.325kPa) is 4-94%. After a large number of hydrogen and oxygen molecules are mixed, contacted and ignited in a mixed gas, the two quickly react and release a large amount of heat in a very short time. These gases are in a limited space, and when the temperature rapidly rises, the gas rapidly expands and rushes out of the container, making a loud explosion. If the container is a closed container or the volume opening is small, the gas cannot be discharged or is not discharged in time, which will cause the container to burst and cause danger.

[0004] In view of H2 is a highly flammable and explosive gas, it is difficult to store, transport and use safely, smelting furnace needs high efficiency and long-term stable production, if the smelting furnace works under high temperature and high pressure conditions for a long time, it is difficult to guarantee the safety of smelting furnace equipment and employees, and it does not meet the goal of metallurgical process design. The ball (such as sintered pellet) needs to be transported to the smelting furnace by pipeline. Without special pretreatment, the 8mm-16mm pellets are randomly stacked in the pipeline and the smelting furnace, and the gap between the pellets is filled with low-oxygen flue gas discharged from the sintering device and transported with the pellets. The space between the pellets in the pipeline and the smelting furnace is small, the air inlet and outlet is not smooth, the H2 combustion is not reliable and easy to cause H2 retention, and when the ignition conditions are met, it is also difficult to burn and exhaust smoke, and the possibility of deflagration is great. The H2 retention in the gap between the pellets, the impurity of H2 or the existence of filling oxygen may cause deflagration and cause danger when heated or with a fire source. That is, the filling oxygen in the gap between the pellets needs to be removed before the pellets are sent into the smelting furnace, and the removal of the filling oxygen in the gap between the pellets also needs to consider the operation safety in the transport pipe to avoid the deflagration and safety factors in the pellet pipeline transport pipe.

[0005] Considering the strong reducing property of H2, removing the strong oxidizing component of filling oxygen in the filling flue gas means that the filling flue gas in the gap between the pellets and the weak oxidizing component of filling CO2 (H2+CO2=H2O+CO) is also the removal object. According to the combustion characteristics of H2, the process of developing a ball pipeline transport oxygen removal device and its use method can reduce the greenhouse gas emission intensity and total amount in enterprise production. SUMMARY

[0006] In view of the problems that the filling oxygen in the center gap between the pipeline transport device and the near wall is difficult to diffuse, hydrogen is flammable and explosive and difficult to transport and smelt safely, the present application designs a two-step filling oxygen removal principle based on N2 (clean gas) driving filling oxygen (target gas) and H2 (clean gas) driving filling nitrogen (target gas), filling oxygen-ball separation, induced draft separation cylinder top cavity mainly filled with oxygen, conical cylinder side plate air distribution forms near-wall planar flow to drive the remaining filling oxygen near the wall of the separation cylinder, and the center air supply forms a convergent flow to drive the remaining filling oxygen in the center of the separation cylinder. The ball pipeline transport oxygen removal device and its use method have the technical features of the above-mentioned two-step filling oxygen removal principle.

[0007] The spherical pipeline transport oxygen removal device mainly comprises an upper connecting pipe, a separation cylinder, an outer conical cylinder, a ring-shaped gas collecting pipe, an inner conical cylinder, a middle conical cylinder and a lower connecting pipe, the transport pipe is disconnected into an upstream pipe and a downstream pipe, the downstream pipe is connected with the lower connecting pipe and the upstream pipe is connected with the upper connecting pipe, the separation cylinder comprises a top ring plate, a circular pipe side wall and a bottom conical cylinder side plate, the inner circumference of the top ring plate of the separation cylinder is connected with the bottom circumference of the upper connecting pipe, the inner diameter of the separation cylinder is 1.5-2 times of the inner diameter of the transport pipe, the top ring plate is uniformly provided with equal-diameter exhaust holes, the bottom conical cylinder is arranged in an inverted position by 180 degrees, the small bottom circumference of the bottom conical cylinder is 0.25-0.75 times of the inner diameter of the transport pipe, a plurality of equal-diameter air holes are formed in the bottom conical cylinder side plate along a direction perpendicular to the side plate, the bottom conical cylinder, the outer conical cylinder, the gas collecting pipe and the inner conical cylinder form an equal-pressure chamber, the large bottom circumference of the bottom conical cylinder is connected with the small bottom circumference of the outer conical cylinder, the large bottom circumference of the outer conical cylinder is fully welded to the gas collecting pipe, the two small bottom circumferences of the inner and bottom conical cylinders are fully welded, the large bottom circumference of the inner conical cylinder is fully welded to the circular arc surface of the gas collecting pipe, the distance between the two large bottom circumferences of the outer and inner conical cylinders is equal to the inner diameter of the gas collecting pipe, the circular arc surface of the gas collecting pipe between the two large bottom circumferences of the outer and inner conical cylinders is a semicircular arc surface uniformly provided with a plurality of equal-diameter air holes, the small bottom circumference of the middle conical cylinder is fully welded to the side plate of the bottom conical cylinder, the distance between the two small bottom circumferences of the middle and bottom conical cylinders is less than 50 mm, the circular arc surface of the gas collecting pipe between the two large bottom circumferences of the outer and middle conical cylinders is a 50% semicircular arc surface, the top circumference of the lower connecting pipe is fully welded to the inner side plate of the inner conical cylinder, the distance between the top surface of the lower connecting pipe and the small bottom surface of the inner conical cylinder is 1-2 times of the inner diameter of the transport pipe, the side plate of the inner conical cylinder above the top surface of the lower connecting pipe is uniformly provided with a plurality of horizontal cylindrical air holes along the height and circumference directions, the center axis of the air holes and the center axis of the inner conical cylinder are perpendicular to each other, the diameter of the air holes is equal to that of the air holes of the bottom conical cylinder side plate, 50% clean gas is introduced into the gas collecting pipe to form a planar flow into the near-wall zone of the separation cylinder through the air holes of the bottom conical cylinder side plate, the remaining filling gas of the near-wall pellets is driven to flow to the exhaust holes of the separation cylinder, and the remaining 50% clean gas is sprayed into the top cavity of the inner conical cylinder through the air holes of the inner conical cylinder side plate to form a high-speed converging flow converging to the center of the inner conical cylinder, the converging flow drives the remaining filling gas to flow back to the separation cylinder through the small bottom surface of the bottom conical cylinder, and the lower connecting pipe is connected with the downstream pipe.

[0008] The use method of the spherical pipeline transport oxygen removal device comprises the following steps: two oxygen removal devices are connected in series, the upper connecting pipe of the first oxygen removal device is connected with the upstream pipe, the lower connecting pipe is connected with the upper connecting pipe of the second oxygen removal device, the lower connecting pipe of the second oxygen removal device is connected with the downstream pipe, 0.4-0.6 MPa clean gas is introduced into the gas collecting pipes of the two oxygen removal devices, the negative pressure of the top cavity of the separation cylinder reaches-20 Pa to-60 Pa, the height is equal to 1-2 times of the inner diameter of the transport pipe, the height of the spherical bed in the circular pipe cavity of the separation cylinder is not more than the inner diameter of the transport pipe, and the height of the top cavity of the inner conical cylinder above the top surface of the lower connecting pipe is 1-2 times of the inner diameter of the transport pipe.

[0009] The spherical safety transport smelting device in the field of process industry can use the device.

[0010] Invention high efficiency transport, high efficiency smelting and safe and stable operation. Spherical transport pipe and smelting furnace static pressure distribution is stable, no micro-explosion or explosion, no carrying filler oxygen into smelting furnace. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a vertical section view of the spherical pipe transport oxygen removal device, Figure 2 is a plan view of the spherical pipe transport oxygen removal device, Figure 3 is a horizontal section view of the spherical pipe transport oxygen removal device, Figure 4 is a bottom view of the spherical pipe transport oxygen removal device. Figures 1-4 In the figure, 1 is the upper connecting pipe, 2 is the separation cylinder, 3 is the outer conical cylinder, 4 is the ring-shaped gas collecting pipe, 5 is the inner conical cylinder, 6 is the middle conical cylinder, and 7 is the lower connecting pipe. In the separation cylinder 2, 21 is the top ring plate, 22 is the circular pipe, and 23 is the bottom conical cylinder. DETAILED DESCRIPTION

[0012] The invention will be further described below with reference to the accompanying drawings.

[0013] As shown in the accompanying Figure 1 ~ accompanying Figure 4 , the spherical pipe transport oxygen removal device mainly includes the upper connecting pipe 1, the separation cylinder 2, the outer conical cylinder 3, the ring-shaped gas collecting pipe 4, the inner conical cylinder 5, the middle conical cylinder 6, and the lower connecting pipe 7. After the spherical pipe transport pipe is disconnected into the upstream pipe and the downstream pipe, the top surface of the downstream pipe and the bottom surface flange of the lower connecting pipe 7 are sealingly connected, the bottom surface of the upstream pipe and the top surface flange of the upper connecting pipe 1 are sealingly connected, and the center axes of the separation cylinder 2, the upper connecting pipe 1, and the upstream pipe are collinear and vertically installed.

[0014] As shown in the accompanying Figure 2 , the separation cylinder 2 includes the top ring plate 21, the circular pipe 22 side wall, and the bottom conical cylinder 23 side plate. The bottom circumference of the upper connecting pipe 1 and the inner circumference of the top ring plate 21 of the separation cylinder 2 are fully welded and connected, and the bottom surface of the upper connecting pipe 1 and the top ring plate 21 of the separation cylinder 2 are coplanar. The inner diameter of the separation cylinder 2 is 1.5-2 times the inner diameter of the transport pipe. The top ring plate 21 of the separation cylinder 2 is uniformly provided with exhaust holes (dotted line) uniformly separated in the circumferential direction, and the exhaust fan is used to suck the filling gas in the top cavity of the separation cylinder 2. If the exhaust fan discharges filling gas containing a large amount of dust, it is purified by the dust collector and then discharged, otherwise it is directly discharged. The exhaust holes of the separation cylinder 2 are not provided on the side wall of the separation cylinder 2, which is easy to cause the spherical body to slip into the exhaust pipe and block the air suction of the exhaust fan. The bottom conical cylinder 23 is arranged upside down by 180°, and the large bottom circumference diameter of the bottom conical cylinder 23 is equal to the inner diameter of the circular pipe 22 of the separation cylinder 2. Figure 2

[0015] As shown in the accompanying Figure 3 ~ accompanying Figure 4 ​As shown, the small bottom circumference diameter of the bottom frustum 23 is 0.25-0.75 times the inner diameter of the transport pipe. A plurality of equal-diameter air holes are vertically provided on the side plate of the bottom frustum 23, and the air hole diameter is smaller than the sphere diameter. The number of air holes per unit area near the central axis of the bottom frustum 23 is large. The side plate of the bottom frustum 23, the side plate of the outer frustum 3, the semicircular surface of the gas collecting pipe 4, and the side plate of the inner frustum 5 form an equal-pressure chamber. The large bottom circumference of the bottom frustum 23 and the small bottom circumference of the outer frustum 3 are fully welded, the large bottom circumference of the outer frustum 3 is fully welded to the gas collecting pipe 4, and the small bottom circumference and the large bottom circumference of the inner frustum 5 are fully welded to the semicircular surface of the gas collecting pipe 4. The distance between the large bottom circumference of the outer frustum 3 and the large bottom circumference of the inner frustum 5 is equal to the inner diameter of the gas collecting pipe 4, and the semicircular surface between the large bottom circumference of the outer frustum 3 and the large bottom circumference of the inner frustum 5 is a semicircular surface. A plurality of equal-diameter air holes are uniformly provided on the semicircular surface, and the air hole diameter is smaller than the sphere diameter. The small bottom circumference of the middle frustum 6 and the side plate of the bottom frustum 23 are fully welded, and the distance between the small bottom circumference of the middle frustum 6 and the small bottom circumference of the bottom frustum 23 is less than 50 mm. The semicircular surface of the gas collecting pipe 4 between the large bottom circumference of the outer frustum 3 and the large bottom circumference of the middle frustum 6 is a 50% semicircular surface. The top surface circumference of the lower connecting pipe 7 is fully welded to the side plate of the inner frustum 5, and the distance between the top surface of the lower connecting pipe 7 and the small bottom surface of the inner frustum 5 is 1-2 times the inner diameter of the transport pipe. A plurality of horizontal cylindrical air holes are uniformly provided on the side plate of the inner frustum 5 above the top surface of the lower connecting pipe 7 along the height and circumference directions, the center axis of the air hole and the center axis of the inner frustum 5 vertically intersect, and the air hole diameter is equal to the air hole diameter of the side wall of the bottom frustum 23. The 50% clean gas is vertically sprayed towards the center axis of the inner frustum 5 and forms a collection flow in the top cavity of the inner frustum 5 above the top surface of the lower connecting pipe 7, and the collection flow drives the remaining filling gas at high speed and then flows back to the inner cavity of the separation cylinder 2 from the small bottom surface of the bottom frustum 23.

[0016] As shown in the accompanying drawings, Figure 1 The clean gas collection flow in the top cavity of the inner frustum 5 drives the remaining filling gas in the gap between the spheres to flow back to the inner cavity of the separation cylinder 2 from the small bottom surface of the bottom frustum 23, and then flows upwards through the central sphere of the separation cylinder 2 and is sucked into the induced draft fan. The bottom circumference of the lower connecting pipe 7 and the top surface circumference flange of the downstream pipe are sealed and connected, and the top surface of the lower connecting pipe 7 is perpendicular to the center axis of the inner frustum 5. The inner diameters of the downstream pipe, the lower connecting pipe 7, the upper connecting pipe 1, and the upstream pipe are equal. The center axes of the upstream pipe, the upper connecting pipe 1, the separation cylinder 2, the bottom frustum 23, the outer frustum 3, the gas collecting pipe 4, the inner frustum 5, the middle frustum 6, the lower connecting pipe 7, and the downstream pipe are collinear, vertically installed, and sealed and connected.

[0017] In the process of spherical pipe transportation, the spheres and the gas filling the interspaces between the spheres always move downstream at the same speed. When the spheres move to the top ring plate 21 of the separation cylinder 2, the spheres fall freely into the sphere layer in the inner cavity of the separation cylinder 2 under the action of their own gravity. In the process of falling, the spheres obey the law of discrete body flow, the interaction force between the spheres disappears, and the resistance of the gas filling the interspaces between the spheres in the center of the upper connecting pipe 1 is reduced. When the gas filling the interspaces between the spheres flows to the top ring plate 21 of the separation cylinder 2, the inner diameter of the separation cylinder 2 is 1.5-2 times the inner diameter of the transportation pipe, the cross-sectional area of the flow channel suddenly expands by 2-4 times, the flow speed of the filling gas is reduced to 25%-45%, the residence time of the filling gas in the inner cavity of the separation cylinder 2 is prolonged, and, under the action of the induced fan suction, a negative pressure of -20 Pa to -60 Pa is formed in the near-wall area of the top cavity of the separation cylinder 2. The filling gas and the spheres are quickly separated and flow to the near-wall area of the top cavity of the separation cylinder 2, and then, under the strong suction of the induced fan, the flow line of the filling gas is rapidly reversed by 180° and flows to the top exhaust port of the separation cylinder 2, thereby achieving the effect of driving away most of the filling gas. The negative pressure in the near-wall area of the top cavity of the separation cylinder 2 caused by the suction of the external induced fan reaches -20 Pa to -60 Pa, and, in addition, the central downward discharge of the spheres in the bottom conical cylinder 23 causes the filling gas in the sphere accumulation area in the inner cavity of the separation cylinder 2 to concentrate towards the center, i.e., there is less filling gas in the near-wall area and more filling gas in the center, which provides a basis for the arrangement of clean gas downstream of the separation cylinder 2.

[0018] The sphere inside the separator 2 exits from the small bottom surface of the bottom frustum-shaped cylinder 23. The sphere enters the inner cavity of the bottom frustum-shaped cylinder 23, then falls from its small bottom surface, passes through the manifold of the top cavity of the inner frustum-shaped cylinder 5, and falls into the lower connecting pipe 7. The side plate of the bottom frustum-shaped cylinder 23 separates the inner cavity of the separator 2 from the equalization chamber, maintaining negative pressure in the inner cavity of the separator 2 and positive pressure in the equalization chamber. The side plate of the middle frustum-shaped cylinder 6 separates the equalization chamber into inner and outer equalization chambers. Since the upper 50% of the semi-circular surface faces the outer equalization chamber and the lower 50% faces the inner equalization chamber, 50% of the clean gas blown into the annular gas collecting pipe 4 enters the near-wall area of ​​the separation cylinder 2 from the outer equalization chamber through numerous small holes in the side plate of the bottom truncated cone 23. The remaining 50% of the clean gas then enters the top cavity of the inner truncated cone 5 from the inner equalization chamber through numerous horizontal air holes in the side plate of the inner truncated cone 5 along a direction perpendicular to the central axis of the inner truncated cone 5. Multiple high-speed clean gas flows converge towards the central axis of the inner truncated cone 5 and form a high-speed converging flow. Under the action of pressure difference (positive pressure in the external equalization chamber - negative pressure in the separation cylinder 2), 50% of the clean air in the equalization chamber flows upward through the numerous air holes on the side plate of the bottom truncated cone 23 into the gap between the near-wall spheres in the separation cylinder 2, preventing the filling air in the gap between the near-wall spheres from flowing downward. The remaining 50% of the clean air is injected at high speed into the top cavity of the inner truncated cone 5 through the numerous horizontal air holes on the side plate of the inner truncated cone 5 in a direction perpendicular to the central axis of the inner truncated cone 5, and forms a high-speed converging flow in the top cavity of the inner truncated cone 5. Under the obstruction of the small bottom spheres of the bottom truncated cone 23, it becomes a converging bath. During the process of the spheres passing through the converging bath, each sphere is washed by the clean air. The filling air at every point and in every direction near the surface of the sphere is driven away. The filling air in the horizontal gap of the sphere is driven away by the clean air flowing upward, and the filling air in the vertical gap of the sphere (the filling air in the leeward return zone) is driven away by the radial clean air jet. Under the negative pressure suction inside the separator 2, clean air, along with the remaining filling air in the gaps between the spheres that has reversed 180°, passes through the small bottom surface of the bottom cone 23 and flows upward from the center of the separator 2. Simultaneously, it prevents the remaining filling air in the gaps between the spheres in the center of the separator 2 from flowing downward, ultimately removing the remaining filling air from the gaps. This ensures that when the spheres fall into the lower connecting pipe 7, only clean air surrounds them, and each sphere is completely washed. The spheres falling from the center of the bottom cone 23 disperse through the collecting bath, preventing the remaining filling air hidden in the gaps between the spheres from flowing into the lower connecting pipe 7. At the same time, the change in the negative pressure distribution in the center of the bottom cone 23 also reduces the amount of gap filling air flowing downward with the spheres.

[0019] The invention requires a blower to ensure a negative pressure of -20Pa to -60Pa in the top cavity of the separator 2. To increase the suction force of the blower on the filling gas in the top cavity of the separator 2, the top cavity of the separator 2 can be evenly divided along the circumferential direction (see attached diagram). Figure 2The top surface of each separation area is provided with an equal-aperture exhaust hole, and each exhaust hole is provided with an air induction fan. All the air induction fans are of equal type and motor power, so as to avoid irregular flow of the filling gas in the top cavity of the separation cylinder 2 and affect the effect of rapid exhaust of the filling gas. The invention uses Roots blowers to ensure that the clean gas can pass through the bottom conical cylinder 23 side plate air hole and form a flat clean gas flow in the near-wall area of the separation cylinder 2, so as to form a high-speed collection bath in the top cavity of the inner conical cylinder 5. The air supply mode of the gas collecting pipe 4 can be designed as a multi-chamber air supply mode, so as to improve the equalizing effect of the equalizing chamber and avoid the non-uniformity of the clean gas arranged in the circumferential direction in the near-wall area of the separation cylinder 2. The gas collecting pipe 4 is uniformly separated along the circumferential direction, and each separation area is provided with an equal-aperture air supply hole. Each air supply hole is connected with a Roots blower, and all the Roots blowers are of equal type and motor power.

[0020] When the spherical pipeline transport oxygen removal device is used, two oxygen removal devices of the same type are required to be connected in series to respectively complete the two-step oxygen removal operation of N2 (clean gas) driving filling oxygen (target gas) and H2 (clean gas) driving filling nitrogen (target gas), so as to realize safe replacement of the filling oxygen in the spherical gap by H2, and to ensure the stable and safe performance of the subsequent smelting furnace hydrogen reduction smelting production. One-step oxygen removal operation, that is, only one spherical pipeline transport oxygen removal device is used to directly drive the filling oxygen in the spherical gap by H2. Due to the small spherical gap and large spherical flow resistance, the flow, heat transfer and mixing mass transfer conditions of hydrogen and oxygen molecules are poor, and local hydrogen retention easily causes the hydrogen concentration to be in the flammable range, that is, the micro-explosion and deflagration hidden danger cannot be completely eliminated.

[0021] When the application is used, the first oxygen removal device is connected to the top surface of the upper connecting pipe 1 and the bottom surface of the upstream pipe by flange sealing, the bottom surface of the lower connecting pipe 7 is connected to the top surface of the upper connecting pipe 1 of the second oxygen removal device by flange sealing, and the bottom surface of the lower connecting pipe 7 of the second oxygen removal device is connected to the top surface of the downstream pipe by flange sealing. The gas collecting pipe 4 of the first oxygen removal device is connected to 0.4-0.6 MPa nitrogen (clean gas), the gap between the spheres is filled with oxygen (target gas), and nitrogen is discharged from the exhaust hole at the top of the separation cylinder 2, and the negative pressure in the cavity at the top of the separation cylinder 2 reaches-20 Pa to-60 Pa. The speed of the spheres moving downward in the upper connecting pipe 1, the separation cylinder 2 and the lower connecting pipe 7 is controlled so that the cavity below the top ring plate 21 of the separation cylinder 2 is not filled with spheres, the height of the sphere accumulation in the inner cavity of the separation cylinder 2 does not exceed the inner diameter of the transport pipe, the cavity above the top surface of the inner conical cylinder 5 is not filled with spheres, and the height of the cavity at the top of the inner conical cylinder 5 is 1-2 times the inner diameter of the transport pipe. The gas collecting pipe 4 of the second oxygen removal device is connected to 0.4-0.6 MPa hydrogen (clean gas), the gap between the spheres is filled with nitrogen (target gas), and hydrogen is discharged from the exhaust hole at the top of the separation cylinder 2, and the negative pressure in the cavity at the top of the separation cylinder 2 reaches-20 Pa to-60 Pa. The speed of the spheres moving downward in the upper connecting pipe 1, the separation cylinder 2 and the lower connecting pipe 7 is controlled so that the cavity below the top ring plate 21 of the separation cylinder 2 is not filled with spheres, the height of the sphere accumulation in the inner cavity of the separation cylinder 2 does not exceed the inner diameter of the transport pipe, the cavity above the top surface of the inner conical cylinder 5 is not filled with spheres, and the height of the cavity at the top of the inner conical cylinder 5 is 1-2 times the inner diameter of the transport pipe.

[0022] When the height of the sphere bed in the inner cavity of the separation cylinder 2 exceeds the inner diameter of the transport pipe, the flow of clean gas through the sphere bed will be significantly hindered due to the excessive height of the sphere accumulation. The height of the sphere bed in the separation cylinder 2 is controlled, the bottom conical cylinder 23 is arranged in a "V" shape, and the high-speed convergent flow formed by the cavity at the top of the inner conical cylinder 5 is beneficial to breaking the arch of material at the discharge port of the bottom conical cylinder 23, and increasing the stability of the sphere pipeline transport of the inventive device. In addition, the "V" shape arrangement of the bottom conical cylinder 23 is beneficial to the movement of the spheres near the wall to the center, achieving the effect of exhausting the spheres in the separation cylinder 2.

[0023] The use of the application requires correct configuration of the rated air volume of each fan and control of the sphere movement speed to ensure the stability of the sphere pipeline transport and the operation of driving out the filling gas. The total air volume of the induced draft fan exceeds the sum of the total air volume of the Roots blower and the volume of the filling gas in the gap between the spheres. The sphere movement speed in the upper connecting pipe 1 is equal to the sphere movement speed in the lower connecting pipe 7, and the sphere discharge speed of the bottom conical cylinder 23 exceeds the sphere movement speed in the upper connecting pipe 1.

[0024] The device has the structural features of "dropping the ball from the center hole of the top ring plate 21 of the separation cylinder 2, the inner diameter of the separation cylinder 2 is 1-1.5 times larger than the inner diameter of the transport pipe, the top surface of the ball layer of the separation cylinder 2 is 1-2 times the inner diameter of the transport pipe away from the inner wall surface of the top of the separation cylinder 2, the negative pressure of the top cavity of the separation cylinder 2 reaches-20Pa to-60Pa, and the top ring plate 21 of the separation cylinder 2 is uniformly provided with exhaust holes". The technical effect caused by this structural feature is "high-efficiency separation of filling gas-balls, and the main filling gas in the top cavity of the separation cylinder 2 is sucked in the reverse direction by the induced draft fan, which solves the problem of the diffusion flow of the filling oxygen in the gap between the central balls. When the ball in the upper connecting pipe 1 enters the inner cavity of the separation cylinder 2, the filling gas flow rate is reduced to 25%-45% of the moving speed of the ball in the transport pipe due to the sudden expansion of the flow passage cross-sectional area by 2-4 times, and the-20Pa to-60Pa negative pressure in the near-wall area of the top cavity of the separation cylinder 2 improves the ability of the filling gas flow line to rapidly reverse 180°, and the balls become discrete bodies, so that the interaction force between the balls disappears, the resistance of the filling gas moving out of the gap between the balls is small, and the ball passing through the top cavity of the separation cylinder 2 completes the process of most of the filling gas being separated from the gap between the balls and being driven out, which naturally reduces the difficulty and investment of the clean gas in driving the remaining filling gas.

[0025] The device has the structural features of "the bottom conical cylinder 23 is arranged in an inverted position by 180°, and the small bottom circumference diameter is 0.25-0.75 times the inner diameter of the transport pipe. The side plate of the bottom conical cylinder 23, the side plate of the outer conical cylinder 3, the semicircular surface of the gas collecting pipe 4 and the side plate of the inner conical cylinder 5 form an equalizing chamber, the equalizing chamber is divided into inner and outer equalizing chambers by the side plate of the middle conical cylinder 6, 50% of the clean gas flows through the small air holes of the side plate of the bottom conical cylinder 23 and the outer equalizing chamber to form a planar flow through the gap between the balls in the near-wall area of the separation cylinder 2, and 50% of the clean gas passes through the inner equalizing chamber and the numerous horizontal air holes of the side plate of the inner conical cylinder 5 to be sprayed into the top cavity of the inner conical cylinder 5 at a high speed in a way perpendicular to the central axis of the side plate of the inner conical cylinder 5 and form a collection bath with a height of 1-2 times the inner diameter of the transport pipe, and the filling gas is carried back to flow through the gap between the central ball bed of the separation cylinder 2 when the central ball of the separation cylinder 2 passes through the collection bath in a discrete state". The technical effect caused by this structural feature is "the air flow formed by the air distribution of the side plate of the bottom conical cylinder 23 drives the remaining filling gas in the near-wall area of the separation cylinder 2, the air flow formed by the air distribution along the radius direction of the inner conical cylinder 5 forms a clean gas collection bath to drive the remaining filling gas in the center of the separation cylinder 2, which enriches the solution to the problem of completely driving out the filling oxygen in the central ball bed and ensures the economy and effect of driving out the remaining filling oxygen in the ball bed".

[0026] The device has the structural feature of "front balloon separation zone-separation cylinder 2-back balloon separation zone". The technical effect caused by this structural feature is that "the main part and the remaining part of the filling gas between the balls are driven out twice, the front balloon separation zone completes the replacement of the main filling gas, saving the clean gas consumption required for the subsequent replacement of the remaining filling gas, and the back balloon separation zone completes the replacement of the remaining filling gas, which improves the economy of the invention and ensures the effect of driving out the filling gas between the balls". The top cavity of the separation cylinder 2 below the top ring plate 21 with a height of 1-2 times the inner diameter of the transport pipe is the front balloon separation zone. In the front balloon separation zone, the balls transported by the upper connecting pipe 1 upstream pipe pass through the top inner cavity of the separation cylinder 2 in a dispersed state, completing the separation process of the balls and the filling gas between the balls, and most of the filling gas is driven out from the space between the balls by the strong suction of the induced draft fan. The top cavity of the inner conical frustum 5 with a height equal to 1-2 times the inner diameter of the transport pipe below the small bottom surface of the bottom conical frustum 23 is the back balloon separation zone. In the back balloon separation zone, the clean gas is organized to flow at high speed and form a collection bath, and the balls discharged from the small bottom surface of the bottom conical frustum 23 pass through the collection bath in a dispersed state and are washed one by one. The filling gas near different position points on the surface of each ball is replaced by the clean gas flow flowing from different directions, completing the complete driving out operation of the remaining filling gas between the balls. The Roots blower air supply pressure exceeds the resistance of the center ball bed of the separation cylinder 2, and is much smaller than the resistance of the ball bed of the lower connecting pipe 7 and the downstream pipe (the ball transport distance is equivalent to the height of the ball bed), and the collection flow in the top cavity of the inner conical frustum 5 above the top surface of the lower connecting pipe 7 is under positive pressure, and the collection flow can only be discharged from the small bottom surface of the separation cylinder 2, but cannot be discharged from the lower connecting pipe 7. In order to maintain the mass conservation of the clean gas in the top cavity of the inner conical frustum 5, the inlet and outlet clean gas flow of the top cavity of the inner conical frustum 5 is equal, and the collection flow of the clean gas introduced into the inner cavity of the separation cylinder 2 through the small bottom surface of the bottom conical frustum 23 is sufficient to drive the filling gas of the center ball bed of the separation cylinder 2. The invention can solve the problem of large resistance of the filling gas flow to the edge of the ball bed, and the problem of filling oxygen in the backflow area of the windward surface of the ball.

[0027] The application device uses a method with the technical features of "two-step method of filling oxygen (target gas) driven by N2 (clean gas) and filling nitrogen (target gas) driven by H2 (clean gas)". The application uses two spherical pipe transport oxygen removal devices in series. The first oxygen removal device completes the filling oxygen (target gas) driven by N2 (clean gas), and the second oxygen removal device completes the filling nitrogen (target gas) driven by H2 (clean gas). H2 safely replaces the filling oxygen in the gap between the spheres under the condition that oxygen and hydrogen molecules do not directly contact. Although the investment in an additional oxygen removal device and the consumption of clean gas N2 are increased, the stability and safety of subsequent smelting furnace hydrogen reduction smelting production are guaranteed, and the solution to the problem of H2 micro-detonation or detonation and difficult safe transportation is enriched. In order to strengthen the effect of N2 (clean gas) driving filling oxygen (target gas) and H2 (clean gas) driving filling nitrogen (target gas), 2 or more oxygen removal devices (N2 as clean gas, filling oxygen as target gas) can be used in series, and 2 or more oxygen removal devices (H2 as clean gas, N2 as target gas) can be used in series. The upstream pipe is connected to the upper connecting pipe of the first oxygen removal device (N2 as clean gas). The lower connecting pipe of the previous oxygen removal device (N2 as clean gas) is connected to the upper connecting pipe of the next oxygen removal device (N2 as clean gas). The lower connecting pipe of the last oxygen removal device (N2 as clean gas) is connected to the upper connecting pipe of the first oxygen removal device (H2 as clean gas). The lower connecting pipe of the previous oxygen removal device (H2 as clean gas) is connected to the upper connecting pipe of the next oxygen removal device (H2 as clean gas). The lower connecting pipe of the last oxygen removal device (H2 as clean gas) is connected to the downstream pipe. The larger the diameter of the transport pipe, the more oxygen removal devices are configured in each step of the two-step method. The application avoids using a one-step method to remove filling oxygen. The one-step method removes the filling oxygen in the spherical bed, that is, only one oxygen removal device is used to directly drive the filling oxygen in the spherical bed with hydrogen. Hydrogen and oxygen molecules have countless opportunities to directly mix. Due to the small gap between the spheres and the large flow resistance of the spheres, the flow, heat transfer, and mixing mass transfer conditions of hydrogen and oxygen molecules are poor. Local hydrogen retention easily causes the hydrogen concentration to be in the flammable range, that is, the micro-detonation or detonation hazard cannot be completely eliminated.

[0028] The invention has the technical feature of "continuous removal of oxygen filled in the ball bed". The first oxygen removal device is connected with pipe 1, and the ball continuously falls into the inner cavity of separation cylinder 2. The ball of separation cylinder 2 continuously falls into lower connecting pipe 7 from the small bottom surface of bottom conical cylinder 23, and then flows through the second oxygen removal device, and the ball continuously falls into the inner cavity of separation cylinder 2 from the upper connecting pipe 1. The ball of separation cylinder 2 continuously falls into lower connecting pipe 7 from the small bottom surface of bottom conical cylinder 23, and finally each ball is surrounded by hydrogen and falls into the smelting furnace. The whole process is stable in the flow of gas in the two oxygen removal devices and the movement of the ball, without stagnation and blockage. Each component and each link always satisfies the law of conservation of mass of the ball, and is suitable for large-capacity hydrogen reduction smelting production in process industry. When the invention is used, the upstream and downstream pipes are vertical pipes, and the transport pipe is completely filled with balls. The chemical industry commonly used method for removing oxygen filled in the ball bed is "ball separation tank filling + vacuumizing the ball tank under the premise of air sealing and isolation". This method is safe and reliable, but has poor economy, large vacuumizing difficulty, discontinuous oxygen removal operation, low production efficiency, and the problem of difficulty in diffusion of the gas filled in the center of the ball bed to the near wall. Therefore, it is not suitable for large-capacity hydrogen reduction smelting production in process industry.

[0029] The ball safe transport smelting device in the field of process industry can use the invention.

[0030] The invention has good economy, can efficiently transport balls, and can ensure the safe and stable operation of the ball transport system. The static pressure distribution of the ball transport pipe and the smelting furnace is stable, without fluctuation, micro-explosion or explosion, the effect of removing the filled oxygen is stable, and the filled oxygen is not carried into the smelting furnace.

Claims

1. A spherical pipeline deoxygenation device, mainly comprising an upper connecting pipe, a separation cylinder, an outer frustum-shaped cone, an annular gas collecting pipe, an inner frustum-shaped cone, a middle frustum-shaped cone, and a lower connecting pipe. The transport pipe is disconnected to form upstream and downstream pipes, with the downstream pipe connected to the lower connecting pipe and the upstream pipe connected to the upper connecting pipe. Its main features are: the separation cylinder includes a top annular plate, a circular pipe sidewall, and a bottom frustum-shaped cone sidewall; the inner circumference of the top annular plate of the separation cylinder connects to the bottom circumference of the upper connecting pipe; the inner diameter of the separation cylinder is 1.5 to 2 times the inner diameter of the transport pipe; the top annular plate has evenly spaced equal-diameter exhaust holes; and the bottom frustum-shaped cone is arranged in an inverted 180° configuration. The circumference diameter of the smaller base of the truncated cone is 0.25 to 0.75 times the inner diameter of the transport pipe. Numerous equal-diameter air holes are opened on the side plates of the bottom truncated cone along a direction perpendicular to the side plates. The bottom truncated cone, outer truncated cone, gas collecting pipe, and inner truncated cone form a pressure equalization chamber. The larger base circumference of the bottom truncated cone connects to the smaller base circumference of the outer truncated cone. The larger base circumference of the outer truncated cone is fully welded to the gas collecting pipe. The two smaller base circumferences of the inner and bottom truncated cones are fully welded together. The larger base circumference of the inner truncated cone is fully welded to the arc surface of the gas collecting pipe. The distance between the two larger base circumferences of the outer and inner truncated cones is equal to the inner diameter of the gas collecting pipe. The gas collecting pipe has a semi-circular arc surface with numerous uniformly spaced equal-diameter air holes. The small base of the middle truncated cone is fully welded to the side plate of the bottom truncated cone. The distance between the two small bases of the middle and bottom truncated cones is less than 50mm. The gas collecting pipe between the two large bases of the outer and middle truncated cones has a 50% semi-circular arc surface. The top circumference of the lower connecting pipe is fully welded to the inner side plate of the inner truncated cone. The distance between the top surface of the lower connecting pipe and the small base of the inner truncated cone is 1 to 2 times the inner diameter of the transport pipe. Numerous horizontal cylindrical air holes are evenly spaced along the height and circumference of the side plate of the inner truncated cone above the top surface of the lower connecting pipe. The central axis of the hole intersects perpendicularly with the central axis of the inner truncated cone, and the diameter of the air hole is equal to the diameter of the air hole on the side plate of the bottom truncated cone. 50% of the clean air blown into the gas collecting pipe forms a planar flow through the air hole on the side plate of the bottom truncated cone and enters the near-wall area of ​​the separation cylinder. This drives the remaining filling gas of the near-wall pellets to leave the pellet bed and flow to the exhaust hole of the separation cylinder. The remaining 50% of the clean air is sprayed into the top cavity of the inner truncated cone through the air hole on the side plate of the inner truncated cone, forming a high-speed converging flow that gathers towards the center of the inner truncated cone. The converging flow drives the remaining filling gas to flow back to the separation cylinder through the small bottom surface of the bottom truncated cone. The lower connecting pipe connects to the downstream pipe.

2. The method of using the spherical pipeline deoxygenation device according to claim 1, characterized in that: two deoxygenation devices are used in series, the upper connecting pipe of the first deoxygenation device is connected to the upstream pipe, the lower connecting pipe of the first deoxygenation device is connected to the upper connecting pipe of the second deoxygenation device, the lower connecting pipe of the second deoxygenation device is connected to the downstream pipe, clean gas of 0.4MPa to 0.6MPa is introduced into the gas collecting pipes of the two deoxygenation devices, the negative pressure of the top cavity of the separation cylinder reaches -20Pa to -60Pa, the height is equal to 1 to 2 times the inner diameter of the transport pipe, the height of the spherical bed in the inner cavity of the separation cylinder does not exceed the inner diameter of the transport pipe, and the height of the top cavity of the inner cone cylinder above the top surface of the lower connecting pipe is 1 to 2 times the inner diameter of the transport pipe.

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