A system for reducing gas purification and tail gas treatment of a gas-based vertical furnace system

Abstract

The present invention discloses a system for reducing gas purification and tail gas treatment of a gas-based vertical furnace system, which relates to the field of chemical and chemical technology, and includes a desulfurization tower, a regeneration tower, a gas-based vertical furnace, and a reaction tank arranged in the gas-based vertical furnace. The present invention is provided with a desulfurization tower and a regeneration tower, and H in the reducing gas is regenerated by absorption. 2 S is separated and then transported to the reaction tank for thermal decomposition to generate H 2 , the decomposed H 2 After the reducing gas is introduced, it can be used in the gas-based vertical furnace for reduction ironmaking, which is beneficial to H 2 At the same time, by placing the reaction tank in a gas-based vertical furnace, the high temperature generated by the reduction ironmaking in the gas-based vertical furnace is used to generate hydrogen in the reaction tank. 2 The thermal decomposition of S provides a heat source, which is conducive to fully utilizing the heat energy in the gas-based vertical furnace, reducing the energy consumption during the operation of the system to a certain extent, and is conducive to fully utilizing resources.

Description

Technical Field

[0001] The invention relates to the technical field of chemistry and chemical engineering, and in particular to a system for purifying reducing gas and treating tail gas of a gas-based vertical furnace system. Background Art

[0002] In the prior art, using natural gas as reducing gas for ironmaking production is a relatively mature technical means. In actual production, there is usually a large amount of H2S in the raw natural gas. If this H2S is directly introduced into the gas-based vertical furnace, the deflagration of H2S will not only affect the stability and safety of the ironmaking production, but also cause a large amount of S2O to be produced in the tail gas. Direct emission will cause great pollution to the environment. For this reason, in the actual production of the gas-based vertical furnace reduction ironmaking system, the reducing gas will be purified in advance and the tail gas will be harmlessly treated.

[0003] In the prior art, when purifying reducing gas, H2S is usually reacted to generate sulfur with the help of a Claus reactor. Although the H2S in the reducing gas is removed in this process, the reducing gas is purified, and the sulfur is recovered by the reaction, the very precious hydrogen resources in the H2S are lost in the form of water. The hydrogen in the H2S is difficult to act on the gas-based vertical furnace reduction ironmaking system, which causes resource loss to a certain extent.

[0004] To this end, a system for reducing gas purification and tail gas treatment of a gas-based vertical furnace system is proposed to solve some of the problems existing in the above-mentioned prior art. Summary of the invention

[0005] The purpose of the present invention is to solve the disadvantage of the prior art that when the reducing gas is purified in the gas-based vertical furnace reduction ironmaking system, the hydrogen resources in H2S are lost, resulting in resource loss, and a system for reducing gas purification and tail gas treatment of the gas-based vertical furnace system is proposed.

[0006] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0007] A system for reducing gas purification and tail gas treatment of a gas-based vertical furnace system comprises a desulfurization tower, an absorbent supply unit, a regeneration tower and a gas-based vertical furnace, wherein a gas supply pipe is connected to the bottom of the desulfurization tower, the absorbent supply unit is connected to the top of the desulfurization tower through a pipeline, the bottom of the desulfurization tower is connected to the top of the regeneration tower through a pipeline, the bottom of the regeneration tower is connected to the absorbent supply unit through a pipeline, the top of the desulfurization tower is connected to the inside of the gas-based vertical furnace through a pipeline, a reaction tank is installed in the gas-based vertical furnace, and a symmetrically arranged air inlet pipe and an air outlet pipe are fixedly installed on the outer end wall of the reaction tank, the air inlet pipe and the air outlet pipe horizontally penetrate to the outside of the gas-based vertical furnace, a plurality of air flow channels connected between the air inlet pipe and the air outlet pipe are evenly opened in the reaction tank, the plurality of air flow channels have the same length and the same inner diameter, the top of the regeneration tower is connected to the air inlet pipe through a pipeline, the air outlet pipe is connected to the air supply pipe through a pipeline, and the exhaust port of the gas-based vertical furnace is sequentially connected to an exhaust gas pretreatment unit and an exhaust gas refinement treatment unit through a pipeline.

[0008] Preferably, at least two desulfurization towers are provided, and the airflow direction of the at least two desulfurization towers is connected in series, the top of the previous desulfurization tower is connected to the bottom of the next desulfurization tower, and the top of the last desulfurization tower is connected to the interior of the gas-based vertical furnace.

[0009] Preferably, the reaction tank is arranged as a spherical structure, the air inlet pipe and the air outlet pipe are rotatably connected to the gas-based vertical furnace, the pipes communicating with the air inlet pipe and the air outlet pipe are rotatably connected to the air inlet pipe and the air outlet pipe respectively, a driving unit is fixedly installed on the outer end wall of the gas-based vertical furnace, and the driving unit is transmission-connected to the air inlet pipe.

[0010] Preferably, a first heat pipe in a spiral structure is fixedly sleeved on the outer end wall of the regeneration tower, and the first heat pipe is connected between the air outlet pipe and the air supply pipe.

[0011] Preferably, the exhaust gas pretreatment unit includes a shell, and a vertical plate symmetrically arranged on the left and right is fixedly installed in the shell, the left and right ends of the shell form a dust collecting bin under the separation of the left and right shells, and the middle position of the shell forms a water storage bin under the separation of the left and right shells, and a plurality of conduits penetrating the water storage bin are fixedly connected between the left and right shells, and traction wheels symmetrically arranged on the two ends of the conduits are rotatably installed on the end walls of the left and right shells away from the water storage bin, a traction rope movably inserted in the corresponding conduit is connected between a pair of traction wheels, and a cleaning ball matched with the internal size of the conduit is fixedly installed on the traction rope, a cleaning ball matched with the internal size of the conduit is fixedly installed on the outer end wall of the shell, a first servo motor is fixedly installed on the outer end wall of the shell, and the drive shaft of the first servo motor is drivingly connected to the traction wheel.

[0012] Preferably, a second heat pipe in a spiral structure is fixedly sleeved on the outer end wall of the regeneration tower, and the second heat pipe is intertwined with the first heat pipe, and the second heat pipe is connected to the top of the water storage tank through a pipeline.

[0013] Preferably, the conduit is configured as a wavy structure.

[0014] Preferably, two adjacent conduits share a pair of traction wheels, the traction rope transmission sleeve is connected to the outside of a pair of left-right symmetrical traction wheels, and the traction rope is movably inserted into the two adjacent conduits.

[0015] Preferably, there are multiple cleaning balls, and evenly distributed ball grooves are opened around the cylindrical surface of the traction wheel, and the internal dimensions of the ball grooves are adapted to the external dimensions of the cleaning balls. The distance between two adjacent cleaning balls on the same traction rope is the same as the distance between two adjacent ball grooves on the same traction wheel.

[0016] Preferably, a dust extraction mechanism is installed at the bottom of the shell, and the dust extraction mechanism includes a receiving bucket fixedly installed at the bottom of the shell and connected to the dust collecting bin, the bottom of the receiving bucket is fixedly connected to a columnar box, and the connection between the columnar box and the receiving bucket is set as a connecting port, and a transversely arranged rotating shaft is rotatably installed at the axial position of the columnar box, and a plurality of partition plates evenly distributed in the columnar box are fixed around the outer end wall of the rotating shaft, and the outer side size of the partition plates is matched with the inner side size of the columnar box, a second servo motor is fixedly installed on the outer end wall of the columnar box, and the driving shaft of the second servo motor is drivingly connected to the rotating shaft, a filter cartridge is fixedly installed on one side of the bottom of the columnar box, and a dust extraction pipe corresponding to the filter cartridge is fixedly connected to the other side of the bottom of the columnar box.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, by providing a desulfurization tower and a regeneration tower, H2S in the reducing gas is separated by absorption and regeneration, and then transported to the reaction tank for thermal decomposition to generate H2. The decomposed H2 can be used in a gas-based vertical furnace for reduction ironmaking after being merged into the reducing gas, which is beneficial to the utilization of hydrogen resources in H2S. At the same time, by arranging the reaction tank in the gas-based vertical furnace, the high temperature generated by the reduction ironmaking in the gas-based vertical furnace provides a heat source for the thermal decomposition of H2S in the reaction tank, which is beneficial to the full utilization of the heat energy in the gas-based vertical furnace, and to a certain extent reduces the energy consumption during the operation of the system, which is beneficial to the full utilization of resources.

[0019] 2. In the present invention, at least two desulfurization towers are provided and connected in series, so that after the reducing gas is desulfurized and purified in the first desulfurization tower, it will be desulfurized and purified again in the next desulfurization tower, which can not only ensure that the H2S in the reducing gas is fully and completely separated, but also disperse the desulfurization operation into multiple desulfurization towers, which is conducive to improving the efficiency of separating H2S from the reducing gas;

[0020] 3. In the present invention, by setting the reaction tank to a spherical structure and providing a driving unit to drive the reaction tank to rotate in the gas-based vertical furnace, the air flow channels opened in the gas-based vertical furnace can be evenly heated, which is beneficial to ensure the uniformity of heating when H2S passes through each air flow channel, and further to ensure the stability of thermal decomposition of H2S. At the same time, by using high-temperature resistant ceramics to fire the reaction tank, the air inlet pipe and the air outlet pipe, it can operate stably in a high temperature environment of 1200°C;

[0021] 4. In the present invention, the first heat pipe and the second heat pipe are interlaced and wound around the outside of the regeneration tower. The H2 produced in the reaction tank will flow in the first heat pipe before being introduced into the reducing gas. The inside of the regeneration tower is heated by the waste heat after the H2 is produced. At the same time, the waste gas produced in the gas-based vertical furnace is recovered by the waste heat after passing through the tail gas pretreatment unit. The high-temperature steam generated by the heating flows into the second heat pipe, which can also provide heat for the inside of the regeneration tower. With the cooperation of each other, the waste heat generated in the system can be fully recovered and reused, which is conducive to further reducing the energy consumption of the system during operation, and is convenient for energy saving and multiple utilization.

[0022] 5. In the present invention, by fixing and connecting multiple conduits between the left and right vertical plates, and setting the shape of the conduits to a wavy structure, when the exhaust gas flows through the conduits, the dust in the exhaust gas can be gathered on the inner end wall of the conduit under the collision between the airflow and the inner end wall of the conduit, and the dust in the exhaust gas is roughly separated in advance, which is beneficial to reducing the workload of the subsequent bag filter dust collector. At the same time, the traction rope is pulled by the traction wheel to move, and the cleaning ball is pulled to move in the conduit, so that the inner end wall of the conduit is automatically cleaned, which is beneficial to ensure the long-term stable operation of the exhaust gas pretreatment unit;

[0023] 6. In the present invention, by arranging the dust discharge mechanism at the bottom of the dust collecting bin and rotating a plurality of partition plates in the cylindrical box, the dust accumulated at the bottom of the dust collecting bin can be conveniently and smoothly discharged. At the same time, by means of the uniform distribution of a plurality of partition plates, a blockage is formed in the cylindrical box, which can prevent the bottom of the dust collecting bin from connecting with the outside to form an air flow channel, thereby ensuring not only the stability of the exhaust gas flowing from left to right in the exhaust gas pretreatment unit, but also the stability of the dust accumulated at the bottom of the dust collecting bin being discharged to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 is a flow chart of the present invention;

[0026] Figure 2 is a stereoscopic diagram of the tail gas pretreatment unit of the present invention;

[0027] Figure 3 For the present invention Figure 2 Front view of the middle structure;

[0028] Figure 4 For the present invention Figure 3 Sectional view at AA in the middle;

[0029] Figure 5 For the present invention Figure 3 Cross-section at the middle BB;

[0030] Figure 6 For the present invention Figure 2 Front view of the structure in section;

[0031] Figure 7 A three-dimensional diagram of the internal structure of the housing of the present invention;

[0032] Figure 8 is a cross-sectional view of the catheter of the present invention;

[0033] Fig. 9 A three-dimensional diagram of the traction wheel and the ball groove of the present invention;

[0034] Fig.10 This is a disassembled diagram of the dust extraction mechanism of the present invention.

[0035] Serial numbers in the figure: 1, desulfurization tower; 101, air supply pipe; 2, absorbent supply unit; 3, regeneration tower; 301, first heat pipe; 302, second heat pipe; 4, gas-based vertical furnace; 401, reaction tank; 402, air inlet pipe; 403, air outlet pipe; 5, tail gas pretreatment unit; 501, shell; 502, vertical plate; 503, dust collecting bin; 504, water storage bin; 505, duct; 506, traction wheel; 507, traction rope; 508, cleaning ball; 509, ball groove; 510, first servo motor; 6, tail gas refinement treatment unit; 7, dust extraction mechanism; 701, receiving bucket; 702, columnar box; 703, connection port; 704, rotating shaft; 705, partition plate; 706, second servo motor; 707, filter cartridge; 708, dust extraction pipe. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] Embodiment: This embodiment provides a system for reducing gas purification and tail gas treatment of a gas-based vertical furnace system, see Figure 1 - Fig.10 Specifically, it includes a desulfurization tower 1, an absorbent supply unit 2, a regeneration tower 3 and a gas-based vertical furnace 4. The lower part of the desulfurization tower 1 is connected with a gas supply pipe 101, the absorbent supply unit 2 is connected to the upper part of the desulfurization tower 1 through a pipeline, the bottom of the desulfurization tower 1 is connected with the upper part of the regeneration tower 3 through a pipeline, the bottom of the regeneration tower 3 is connected with the absorbent supply unit 2 through a pipeline, the top of the desulfurization tower 1 is connected with the inside of the gas-based vertical furnace 4 through a pipeline, a reaction tank 401 is installed in the gas-based vertical furnace 4, and the outer end wall of the reaction tank 401 is fixedly installed with a symmetrically arranged air inlet pipe 402 and an air outlet pipe 403, the air inlet pipe 402 and the air outlet pipe 403 horizontally penetrate to the outside of the gas-based vertical furnace 4, a plurality of air flow channels connected between the air inlet pipe 402 and the air outlet pipe 403 are evenly opened in the reaction tank 401, and the plurality of air flow channels have the same length and inner diameter. The top of the regeneration tower 3 is connected to the air inlet pipe 402 through a pipe, and the air outlet pipe 403 is connected to the air supply pipe 101 through a pipe. The exhaust port of the gas-based vertical furnace 4 is sequentially connected to the tail gas pretreatment unit 5 and the tail gas refinement treatment unit 6 through a pipe. When the system is actually running, the reducing gas passes through the air supply pipe 10 1 is sent into the desulfurization tower 1, and the reducing gas is mainly composed of crude natural gas, and the crude natural gas mainly contains components such as CH4, H2O, CO, CO2, H2 and H2S. Among them, CH4, CO and H2 can be stably burned and used in the gas-based vertical furnace 4, while H2S is prone to explosion and deflagration when ignited. In order to ensure production safety, it cannot be directly introduced into the gas-based vertical furnace 4 for combustion and use. In the prior art, H2S is mostly absorbed and used for sulfur production, which affects the combustion efficiency of the reducing gas in the gas-based vertical furnace 4. During the operation of the system in the present invention, The raw gas enters the desulfurization tower 1 from the bottom through the gas supply pipe 101, and flows from bottom to top in the desulfurization tower 1. The absorbent supply unit 2 can provide a weak alkaline solvent as an absorbent into the desulfurization tower 1. The absorbent is sprayed from top to bottom in the desulfurization tower 1. During the contact with the reducing gas, accompanied by a chemical reaction, the H2S in the reducing gas is adsorbed by the absorbent. Taking the alcohol amine desulfurization method as an example, H2S and CO2 dissolved in water are slightly acidic, and react with weakly alkaline amines to generate salts that decompose at high temperatures. Taking methyldiethanolamine as an example, the main reaction between alcohol amines and H2S and CO2 is a reversible reaction.

[0038] The absorbent absorbs H2S and CO2 in the reducing gas in the desulfurization tower 1. The desulfurization tower 1 is in a pressurized and low-temperature state, which is conducive to ensuring the efficient absorption of H2S by the absorbent in the desulfurization tower 1. Then the absorbent is transported from the bottom of the desulfurization tower 1 to the regeneration tower 3, and sprayed from top to bottom in the regeneration tower 3. The regeneration tower 3 is in a reduced pressure and high temperature state, which is convenient for H2S to be regenerated from the absorbent in the regeneration tower 3. The regenerated H2S is transported to the reaction tank 401 through the top of the regeneration tower 3 for thermal decomposition reaction. The absorbent that regenerates H2S can be transported from the bottom of the regeneration tower 3 to the absorbent supply unit 2. The absorbent circulates between the desulfurization tower 1, the regeneration tower 3 and the absorbent supply unit 2 to achieve the absorption and regeneration of H2S.

[0039] During the operation of the system, the gas-based vertical furnace 4 is in operation, and ironmaking production is carried out inside. The reaction tank 401 is located inside the gas-based vertical furnace 4 and can be stably maintained in a heating environment of 1200°C for a long time. H2S is delivered into the reaction tank 401 through the air inlet pipe 402, and then flows out through the air outlet pipe 403. A plurality of air flow channels connected between the air inlet pipe 402 and the air outlet pipe 403 are evenly opened inside the reaction tank 401. These air flow channels have the same inner diameter and length. The speed of H2S in the air flow channel is controlled to control the flow speed of H2S at 50ml / min, and the pressure intensity in the air flow channel is controlled to be 0.05atm. The time for H2S to flow through the air flow channel is 48s, so that H2S can be decomposed into H2 and S by heat in the air flow channel. The decomposed H2 will be re-delivered to the air supply pipe 101, and finally delivered to the gas-based vertical furnace 4 as reducing gas fuel for ironmaking production.

[0040] By connecting the gas outlet pipe 403 with the gas supply pipe 101, the produced H2 is transported to the interior of the desulfurization tower 1, so that in the process of producing H2, the remaining H2S that has not reacted completely can be separated again through the desulfurization tower 1, avoiding directly connecting the gas outlet pipe 403 with the interior of the gas-based vertical furnace 4, which causes the unreacted H2S to be transported to the interior of the gas-based vertical furnace 4, which is beneficial to ensuring the stability and safety of the system during operation.

[0041] In the specific implementation process, Figure 1As shown, at least two desulfurization towers 1 are provided, and the air flow direction of at least two desulfurization towers 1 is connected in series, the top of the previous desulfurization tower 1 is connected to the bottom of the next desulfurization tower 1, and the top of the last desulfurization tower 1 is connected to the interior of the gas-based vertical furnace 4. After the reducing gas is separated from the internal H2S in the previous desulfurization tower 1, it will be introduced into the next desulfurization tower 1 again for H2S removal operation. The series arrangement of multiple desulfurization towers 1 can not only effectively improve the efficiency of H2S separation, but also ensure that the H2S in the reducing gas is fully and comprehensively separated, which is beneficial to reduce the probability of residual H2S being transported to the gas-based vertical furnace 4, and to a certain extent improves the safety and stability of ironmaking production in the gas-based vertical furnace 4.

[0042] In the specific implementation process, Figure 1 As shown, the reaction tank 401 is set to a spherical structure, the air inlet pipe 402 and the air outlet pipe 403 are rotatably connected to the gas-based vertical furnace 4, and the pipes connected to the air inlet pipe 402 and the air outlet pipe 403 are rotatably connected to the air inlet pipe 402 and the air outlet pipe 403 respectively. A driving unit is fixedly installed on the outer end wall of the gas-based vertical furnace 4, and the driving unit is transmission-connected to the air inlet pipe 402. The driving unit installed on the outer end wall of the gas-based vertical furnace 4 is powered on and started. Since the air inlet pipe 402 and the air outlet pipe 403 are rotatably connected to the end wall of the gas-based vertical furnace 4, and the air inlet pipe 402 is transmission-connected to the driving shaft of the driving unit, this makes the driving unit After the driving unit is started, the air inlet pipe 402 can be driven to drive the reaction tank 401 to rotate in the gas-based vertical furnace 4. By setting the gas-based vertical furnace 4 as a spherical structure, it can be driven to rotate at a uniform speed, so that the air flow channels opened in the gas-based vertical furnace 4 can be evenly heated, which is beneficial to ensure the uniformity of heating when H2S passes through each air flow channel, and further helps to ensure the stability of H2S thermal decomposition. The reaction tank 401 and the air inlet pipe 402 and the air outlet pipe 403 in the gas-based vertical furnace 4 are all made of high-temperature resistant ceramics, which can not only ensure air tightness, but also enable it to operate stably in a high temperature environment of 1200°C.

[0043] In the specific implementation process, Figure 1 As shown, a first heat pipe 301 with a spiral structure is fixedly sleeved on the outer end wall of the regeneration tower 3, and the first heat pipe 301 is connected between the gas outlet pipe 403 and the gas supply pipe 101. During the process of H2 produced in the reaction tank 401 being transported to the gas supply pipe 101 through the gas outlet pipe 403, it will flow in the first heat pipe 301 in advance. Since the reaction tank 401 produces H2 in the high temperature environment in the gas-based vertical furnace 4, the H2 generated by the decomposition of H2S is in a high temperature state. The high-temperature H2 flowing through the first heat pipe 301 can utilize the waste heat to heat the regeneration tower 3, so as to reasonably utilize the thermal energy, making the system more energy-saving and environmentally friendly during operation.

[0044] In the specific implementation process, Figure 4 - Figure 6 As shown, the exhaust gas pretreatment unit 5 includes a shell 501, and a vertical plate 502 symmetrically arranged on the left and right is fixedly installed in the shell 501, the left and right ends of the shell 501 form a dust collecting bin 503 under the separation of the left and right shells 501, and the middle position of the shell 501 forms a water storage bin 504 under the separation of the left and right shells 501, and a plurality of conduits 505 penetrating the water storage bin 504 are fixedly connected between the left and right shells 501, and the left and right shells 501 rotate on the end wall of the side away from the water storage bin 504. A traction wheel 506 is installed symmetrically at both ends of the conduit 505, a traction rope 507 that is movably inserted into the corresponding conduit 505 is connected between the pair of traction wheels 506, and a cleaning ball 508 that matches the internal size of the conduit 505 is fixedly installed on the traction rope 507, a cleaning ball 508 that matches the internal size of the conduit 505 is fixedly installed on the outer end wall of the shell 501, a first servo motor 510 is fixedly installed on the outer end wall of the shell 501, and the driving shaft of the first servo motor 510 is connected to the traction wheel 506. The exhaust gas generated by iron smelting in the gas-based vertical furnace 4 contains not only a large amount of dust but also a large amount of waste heat. If the exhaust gas is directly transported to the bag filter, the waste heat will be consumed in large quantities during the long-distance transportation process. During the operation of this system, the exhaust gas will be transported to the exhaust gas pretreatment unit 5 before being transported to the bag filter. The exhaust gas flows from left to right in the exhaust gas pretreatment unit 5, and enters the dust collecting bin on the right through the connection of many ducts 505 from the dust collecting bin 503 on the left. 503, and then discharged outwardly through the pipe above the right dust collecting bin 503. Water is injected into the water storage bin 504. When the exhaust gas flows in the conduit 505, the water in the water storage bin 504 absorbs the heat of the exhaust gas flowing in the conduit 505. The water in the water storage bin 504 is boiled by heating with the waste heat in the exhaust gas. The generated high-temperature steam is discharged through the pipe connected to the top of the water storage bin 504, and the steam heat energy is recovered and converted into other energy for collection and use, which is beneficial to further improve the energy saving and environmental protection of the system during operation.

[0045] When the exhaust gas passes through the duct 505, due to the contact between the exhaust gas and the inner end wall of the duct 505, some dust in the exhaust gas will remain in the duct 505 and accumulate on the inner end wall of the duct 505 during the contact process. At this time, the first servo motor 510 installed on the outer end wall of the shell 501 is powered on and started, and its drive shaft drives the traction wheel 506 to rotate. During the rotation of the traction wheel 506, the traction rope 507 is pulled to move. The movement and pulling of the traction rope 507 drives the cleaning ball 508 to move inside the duct 505, and the dust accumulated on the inner end wall of the duct 505 is cleaned up by friction and scraping. This can not only ensure the smooth flow of the exhaust gas in the duct 505, but also ensure the efficient and stable transfer of the residual heat in the exhaust gas to the water in the water storage tank 504 through the duct 505.

[0046] In the specific implementation process, Figure 1 and Figure 6 As shown, a second heat pipe 302 with a spiral structure is fixedly sleeved on the outer end wall of the regeneration tower 3, and the second heat pipe 302 is intertwined with the first heat pipe 301. The second heat pipe 302 is connected to the top of the water storage tank 504 through a pipeline. The high-temperature steam generated by heating the water in the water storage tank 504 is transported to the second heat pipe 302 fixed around the outer end wall of the regeneration tower 3 through the connection of the pipeline. The interior of the regeneration tower 3 is heated by the high-temperature steam. The heat in the first heat pipe 301 is provided by the waste heat when H2 is produced. The heat in the second heat pipe 302 is provided by the waste heat of the exhaust gas discharged from the gas-based vertical furnace 4. Under the cooperation with each other, a stable high-temperature regeneration environment can be provided for the regeneration tower 3. At the same time, since the first heat pipe 301 and the second heat pipe 302 are interlaced and wound on the outer end wall of the regeneration tower 3, the contact surface between the first heat pipe 301, the second heat pipe 302 and the outer end wall of the regeneration tower 3 is uniform and stable, so that the regeneration tower 3 is heated evenly during the heating process, which can effectively ensure the uniform and stable regeneration of H2S by the absorbent in the regeneration tower 3.

[0047] In the specific implementation process, Figure 7 and Figure 8 As shown, the duct 505 is configured as a wavy structure. Since the shape of the duct 505 is configured as a wavy structure, the internal structure of the duct 505 is more complicated. When the exhaust gas flows inside the duct 505, it can collide with the inner end wall of the duct 505 more frequently. By increasing the degree of collision between the exhaust gas and the inner end wall of the duct 505, the probability of dust in the exhaust gas adhering to the duct 505 is increased. When the waste heat in the exhaust gas is recovered, the dust in the exhaust gas is pre-separated with the help of many evenly distributed ducts 505, which is beneficial to reduce the workload of the subsequent bag-type dust collector and extend the maintenance period of the bag-type dust collector. In addition, since the duct 505 can be automatically cleaned by the movement of the cleaning ball 508, the labor burden of the staff can be reduced to a certain extent.

[0048] In the specific implementation process, Figure 6 - Figure 8 As shown, two adjacent conduits 505 share a pair of traction wheels 506, and a traction rope 507 is transmission-sleeved on the outside of a pair of symmetrical traction wheels 506. The traction rope 507 is movably inserted into the two adjacent conduits 505. Multiple conduits 505 are arranged in pairs between the left and right vertical plates 502. When the traction wheel 506 drives the traction rope 507 to move, the traction rope 507 is wrapped around and inserted between the two adjacent conduits 505, so that the two adjacent conduits 505 share the traction rope 507 and the cleaning ball 508, which is beneficial to reducing the number of traction wheels 506, traction ropes 507 and cleaning balls 508, and to a certain extent reduces the manufacturing cost of the exhaust gas pretreatment unit 5.

[0049] In the specific implementation process, Figure 8 and Fig. 9 As shown, a plurality of cleaning balls 508 are provided, and uniformly distributed ball grooves 509 are formed around the cylindrical surface of the traction wheel 506, and the inner size of the ball groove 509 is matched with the outer size of the cleaning ball 508. The spacing between two adjacent cleaning balls 508 on the same traction rope 507 is the same as the spacing between two adjacent ball grooves 509 on the same traction wheel 506. The cleaning balls 508 will not exist in two adjacent conduits 505 corresponding to a pair of traction wheels 506 at the same time. By providing a plurality of cleaning balls 508 on the traction rope 507, the traction rope 507 is pulled to move during the rotation of the traction wheel 506. Under the traction of the traction rope 507, the cleaning balls 508 on the same traction rope 507 are not simultaneously formed. The plurality of cleaning balls 508 on the rope 507 can move in sequence in the corresponding conduits 505, and the plurality of cleaning balls 508 clean the inner end wall of the conduit 505 in sequence, which is conducive to ensuring that the inner end wall of the conduit 505 is cleaned comprehensively. At the same time, since the cylindrical surface of the traction wheel 506 is provided with a surrounding ball groove 509, the cleaning ball 508 can enter the ball groove 509 when it moves to the position of the traction wheel 506 and continue to be pulled and moved by the traction wheel 506. Under the continuous unidirectional rotation of the traction wheel 506 and the unidirectional continuous traction of the traction rope 507, the cleaning ball 508 can circulate inside two adjacent conduits 505 to ensure that the cleaning of the inner end wall of the conduit 505 is complete. Figure 8Taking the structure in as an example, when the traction wheel 506 drives the traction rope 507 to move clockwise in the two adjacent upper and lower conduits 505, the cleaning ball 508 moves from left to right in the upper conduit 505, passes through the ball groove 509 provided on the cylindrical surface of the right traction wheel 506, and then the cleaning ball 508 moves from right to left in the lower conduit 505, passes through the ball groove 509 provided on the cylindrical surface of the left traction wheel 506, and continues to move from left to right in the upper conduit 505. The above operation is continuously performed, so that the moving cleaning ball 508 can continuously clean the inner end walls of the two adjacent conduits 505, and there is no need to frequently change the moving direction of the cleaning ball 508, which improves the cleaning efficiency to a certain extent. The convenience of cleaning the inner end wall of the duct 505 during the operation of the exhaust gas pretreatment unit 5 is achieved. When the cleaning ball 508 cleans the inner end wall of the duct 505, although a plurality of cleaning balls 508 are fixedly installed on the same traction rope 507, the spacing between the cleaning balls 508 is very close. The plurality of cleaning balls 508 fixedly installed on the same traction rope 507 will not exist in two adjacent ducts 505 at the same time. This ensures that when the duct 505 is cleaned, at least half of the duct 505 is in an unobstructed state, so that when the inner end wall of the duct 505 is cleaned by the movement of the cleaning ball 508, the circulation of the exhaust gas will not be affected. When the duct 505 does not need to be cleaned, the cleaning ball 508 is on the outside of the duct 505 to ensure that all the ducts 505 are in an unobstructed state.

[0050] In the specific implementation process, Figure 4 - Figure 6 and Fig.10As shown, a dust extraction mechanism 7 is installed at the bottom of the shell 501, and the dust extraction mechanism 7 includes a receiving bucket 701 fixedly installed at the bottom of the shell 501 and connected to the dust collecting bin 503, the bottom of the receiving bucket 701 is fixedly connected to a columnar box 702, and the connection between the columnar box 702 and the receiving bucket 701 is set as a connecting port 703, a laterally set rotating shaft 704 is rotatably installed at the axial position of the columnar box 702, a plurality of partition plates 705 evenly distributed in the columnar box 702 are fixed around the outer end wall of the rotating shaft 704, and the outer size of the partition plates 705 is adapted to the inner size of the columnar box 702, a second servo motor 706 is fixedly installed on the outer end wall of the columnar box 702, and the driving shaft of the second servo motor 706 is connected to the inner side of the columnar box 702. The rotating shaft 704 is connected in transmission, and a filter cartridge 707 is fixedly installed on one side of the bottom of the cylindrical box 702. A dust extraction pipe 708 corresponding to the filter cartridge 707 is fixedly connected on the other side of the bottom of the cylindrical box 702. There are at least three partition plates 705. During the rotation of the rotating shaft 704, only one partition plate 705 will appear in the connecting port 703 at the same time. The dust accumulated on the inner end wall of the duct 505 is dredged to the dust collecting bins 503 on the left and right sides through the movement of the cleaning ball 508. Under the action of gravity, the dredged dust accumulates at the bottom of the dust collecting bin 503. The exhaust gas circulation speed in the exhaust pretreatment unit 5 is slow, which is not enough to entrain the dust accumulated at the bottom of the dust collecting bin 503 on a large scale, so that the dust is stably deposited in the dust collecting bin The bottom of the bin 503 is connected to a dust outlet mechanism 7. The multiple partition plates 705 in the cylindrical box 702 divide the internal space of the cylindrical box 702 into multiple relatively independent small spaces. After the second servo motor 706 is powered on and started, it drives the rotating shaft 704 connected to its driving shaft to rotate, driving the multiple partition plates 705 to rotate in the cylindrical box 702. During the rotation of the multiple partition plates 705, the separated small spaces will be driven to rotate synchronously. Under normal circumstances, there is at least one small space docked below the connecting port 703. The dust accumulated at the bottom of the dust collecting bin 503 enters the corresponding small space through the connecting port 703 under the guidance of the receiving bucket 701. An infrared sensor is installed on the inner side of the connecting port 703. When the dust fills the small space, it will continue to accumulate and fill the connection port 703. Due to the obstruction of dust accumulation, the receiving end of the infrared sensor cannot receive the infrared light beam emitted by the transmitting end. This signal indicates that the small space corresponding to the connection port 703 is full of dust. At this time, the second servo motor 706 is started to control the rotating shaft 704 to drive the partition plate 705 to rotate 180°, and the small space above that is connected to the connection port 703 is rotated and connected between the filter cartridge 707 and the dust extraction pipe 708. Synchronously, the external pump of the dust extraction pipe 708 is started, and the airflow enters through the filter cartridge 707, and the dust accumulated in the small space is discharged through the dust extraction pipe 708. The dust accumulated at the bottom of the dust collecting bin 503 is regularly and automatically discharged.This is beneficial to ensure that the tail gas pretreatment unit 5 operates stably for a long time.

[0051] Specifically, the working principle and operation method of the present invention are as follows:

[0052] The reducing gas is transported to the desulfurization tower 1 through the gas supply pipe 101, and the absorbent supply unit 2 sprays the absorbent into the desulfurization tower 1. The H2S and CO2 in the reducing gas are absorbed by the absorbent and then brought into the regeneration tower 3. H2S is regenerated by means of the low-pressure and high-temperature environment in the regeneration tower 3. The restored absorbent is re-sent to the absorbent supply unit 2 for recycling. The pure reducing gas after H2S is separated from the desulfurization tower 1 is sent to the gas-based vertical furnace 4 for use in ironmaking production. The H2S regenerated by the regeneration tower 3 is sent to the reaction tank 401 arranged in the gas-based vertical furnace 4. In the air flow channel in the reaction tank 401, it is thermally decomposed into H2 and S by means of the ultra-high temperature environment in the gas-based vertical furnace 4. The decomposed H2 is transported to the gas supply pipe 101, added to the reducing gas, and finally transported to the gas-based vertical furnace 4. The decomposed H2 is transported to the supply pipe 101. During the process of the gas pipe 101, it will first pass through the first heat pipe 301, and use its residual heat to provide a high-temperature environment for the regeneration reaction in the regeneration tower 3. The exhaust gas generated by the operation of the gas-based vertical furnace 4 is transported to the exhaust gas pretreatment unit 5. When passing through a large number of evenly distributed conduits 505, the waste heat of the exhaust gas is used to heat the water in the water storage tank 504, and high-temperature steam is generated and then discharged, and the steam thermal energy is converted into other energy for recycling. When the exhaust gas passes through the conduit 505, most of the dust will remain on the inner end wall of the conduit 505, reducing the workload of the filter bag dust collector in the subsequent exhaust gas refinement treatment unit 6. The traction rope 507 is pulled by the traction wheel 506 to drive the cleaning ball 508 to move in the conduit 505, automatically clean the inner end wall of the conduit 505, and the cleaned dust is discharged outwardly through the dust discharge mechanism 7.

[0053] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A system for reducing gas purification and tail gas treatment of a gas-based vertical furnace system, comprising a desulfurization tower (1), an absorbent supply unit (2), a regeneration tower (3) and a gas-based vertical furnace (4), characterized in that: The lower part of the desulfurization tower (1) is connected to a gas supply pipe (101), the absorbent supply unit (2) is connected to the upper part of the desulfurization tower (1) through a pipeline, the bottom of the desulfurization tower (1) is connected to the upper part of the regeneration tower (3) through a pipeline, the bottom of the regeneration tower (3) is connected to the absorbent supply unit (2) through a pipeline, the top of the desulfurization tower (1) is connected to the inside of a gas-based vertical furnace (4) through a pipeline, a reaction tank (401) is installed in the gas-based vertical furnace (4), and a symmetrically arranged air inlet pipeline (402) and an air outlet pipeline (403) are fixedly installed on the outer end wall of the reaction tank (401), the air inlet pipeline (402) and an outlet pipe (403) horizontally extending to the outside of the gas-based vertical furnace (4); a plurality of airflow channels connected between the air inlet pipe (402) and the air outlet pipe (403) are evenly provided in the reaction tank (401); the plurality of airflow channels have the same length and the same inner diameter; the top of the regeneration tower (3) is connected to the air inlet pipe (402) through a pipe; the air outlet pipe (403) is connected to the air supply pipe (101) through a pipe; the exhaust port of the gas-based vertical furnace (4) is connected to an exhaust gas pretreatment unit (5) and an exhaust gas refinement treatment unit (6) in sequence through a pipe; the exhaust gas refinement treatment unit (6) comprises a bag filter; The reaction tank (401) is configured as a spherical structure, the air inlet pipe (402) and the air outlet pipe (403) are rotatably connected to the gas-based vertical furnace (4), the pipes connected to the air inlet pipe (402) and the air outlet pipe (403) are rotatably connected to the air inlet pipe (402) and the air outlet pipe (403), respectively, and a driving unit is fixedly mounted on the outer end wall of the gas-based vertical furnace (4), and the driving unit is drivingly connected to the air inlet pipe (402); The exhaust gas pretreatment unit (5) comprises a shell (501), and a vertical plate (502) symmetrically arranged on the left and right is fixedly installed in the shell (501); the left and right ends of the shell (501) form a dust collection bin (503) under the separation of the left and right shells (501); the middle position of the shell (501) forms a water storage bin (504) under the separation of the left and right shells (501); a plurality of conduits (505) penetrating the water storage bin (504) are fixedly connected between the left and right shells (501); and a pair of rotatable guide tubes (505) are rotatably installed on the end walls of the left and right shells (501) on the side away from the water storage bin (504). A traction wheel (506) is arranged at both ends of the conduit (505), a traction rope (507) movably inserted into the corresponding conduit (505) is connected between the pair of traction wheels (506), and a cleaning ball (508) matching the internal size of the conduit (505) is fixedly mounted on the traction rope (507), a cleaning ball (508) matching the internal size of the conduit (505) is fixedly mounted on the outer end wall of the housing (501), a first servo motor (510) is fixedly mounted on the outer end wall of the housing (501), and a driving shaft of the first servo motor (510) is drivingly connected to the traction wheel (506); Two adjacent conduits (505) share a pair of traction wheels (506); the traction rope (507) is transmission sleeved on the outside of a pair of symmetrical traction wheels (506); and the traction rope (507) is movably inserted into the two adjacent conduits (505); A second heat pipe (302) having a spiral structure is fixedly sleeved on the outer end wall of the regeneration tower (3), and the second heat pipe (302) and the first heat pipe (301) are intertwined, and the second heat pipe (302) is connected to the top of the water storage bin (504) through a pipeline, and the conduit (505) is arranged in a wave-shaped structure, and a plurality of cleaning balls (508) are arranged, and evenly distributed ball grooves (509) are arranged around the cylindrical surface of the traction wheel (506), and the inner dimensions of the ball grooves (509) are matched with the outer dimensions of the cleaning balls (508), and the spacing between two adjacent cleaning balls (508) on the same traction rope (507) is the same as the spacing between two adjacent ball grooves (509) on the same traction wheel (506).

2. A system for reducing gas purification and tail gas treatment of a gas-based vertical furnace system according to claim 1, characterized in that: At least two desulfurization towers (1) are provided, and the airflow direction of the at least two desulfurization towers (1) is connected in series, the top of the first desulfurization tower (1) is connected to the bottom of the second desulfurization tower (1), and the top of the last desulfurization tower (1) is connected to the inside of the gas-based vertical furnace (4).

3. The system for reducing gas purification and tail gas treatment of a gas-based vertical furnace system according to claim 1, characterized in that: A first heat pipe (301) having a spiral structure is fixedly sleeved on the outer end wall of the regeneration tower (3), and the first heat pipe (301) is connected between the air outlet pipe (403) and the air supply pipe (101).

4. The system for reducing gas purification and tail gas treatment of a gas-based vertical furnace system according to claim 1, characterized in that: A dust extraction mechanism (7) is installed at the bottom of the shell (501), and the dust extraction mechanism (7) comprises a receiving bucket (701) fixedly installed at the bottom of the shell (501) and connected to the dust collecting bin (503); a columnar box (702) is fixedly connected to the bottom of the receiving bucket (701), and a connection port (703) is provided at the connection point between the columnar box (702) and the receiving bucket (701); a rotating shaft (704) arranged transversely is rotatably installed at the axis position of the columnar box (702), and a plurality of rotating shafts (704) are fixedly installed around the outer end wall of the rotating shaft (704); A partition plate (705) is evenly distributed in the cylindrical box (702), and the outer dimensions of the partition plate (705) are matched with the inner dimensions of the cylindrical box (702); a second servo motor (706) is fixedly mounted on the outer end wall of the cylindrical box (702), and the drive shaft of the second servo motor (706) is drivingly connected to the rotating shaft (704); a filter cartridge (707) is fixedly mounted on one side of the bottom of the cylindrical box (702), and a dust extraction pipe (708) corresponding to the filter cartridge (707) is fixedly connected to the other side of the bottom of the cylindrical box (702).

Images