Efficient converter gas recovery device

Abstract

The utility model relates to the technical field of flue gas treatment, also relates to the field of environmental protection industry, and particularly relates to an efficient converter gas recovery device. According to the converter gas recovery device, the self composition in the converter gas can be converted into CO with higher calorific value, the content of O2 in the flue gas is reduced or even eliminated, the converter gas with higher risk factors enters a safety range, the safety of converter gas recovery is improved while hazardous waste treatment is realized, and meanwhile, CO2 and pulverized coal are directly subjected to instantaneous conversion reaction, so that the safety of converter gas recovery is improved. The CO2 content in the converter gas is reduced, the CO yield is increased, the CO2 emission is reduced, the heat value of the converter gas is increased, the converter gas is completely recycled, the gas combustion diffusion amount is reduced, the atmosphere pollution caused by direct emission of the converter gas is avoided, and the technical effects of greenness, low carbon and emission reduction are achieved to the maximum extent.

Description

Technical Field

[0001] The present application relates to the technical field of the iron and steel metallurgical industry, and in particular to a high-efficiency converter gas recovery device. Background Art

[0002] Converter steelmaking uses molten iron, scrap steel, and ferroalloys as the main raw materials. It does not rely on external heat sources, but relies on the physical heat of the molten iron itself and the chemical reactions between the components of the molten iron to generate heat to complete the steelmaking process in the converter. It is the most commonly used steelmaking process at present.

[0003] During the converter blowing process, a large amount of high-temperature converter gas is produced as a byproduct. The outlet temperature of converter gas is as high as 1200-1600℃, which has a very high sensible heat. Generally, the physical sensible heat of flue gas is recovered by using a waste heat boiler from the vaporization flue. The main components of converter gas are (volume fraction): CO is 40-60%, H 2 <2%, CO 2 15-25%, O 2 0.4~0.8%, N 2 It is 25 to 35%.

[0004] Converter gas contains a high content of CO, which is toxic and explosive. However, the combustible gases in converter gas are mainly CO and H. 2 , and is also a good fuel. 2 The existence of explosives will cause explosions when entering the explosion range, which poses certain safety risks.

[0005] At the same time, there is a high content of CO in the converter gas. 2 , a large amount of CO 2 It not only reduces the combustion calorific value and energy conversion efficiency of converter gas, increases the environmental load on the earth, but also has a certain corrosive effect on gas recovery and storage equipment.

[0006] The converter gas recovery process mainly includes the following factors:

[0007] 1. Regarding the safe recovery of converter gas, the oxygen content in the gas must be strictly controlled to reduce the safety risk of gas explosion.

[0008] 2. Since the converter gas contains 15-25% CO 2 , reducing the calorific value of converter gas.

[0009] 3. CO 2 Emissions have clear targets to reduce CO 2 Emissions have huge advantages for enterprises to reduce costs, increase efficiency and enhance competitiveness.

[0010] 4. Heat recovery of converter gas can only be done by wet process, which uses a large amount of water washing to supplement a large amount of water vapor, thereby diluting the oxygen content and ensuring system safety, but it does not protect CO 2 to convert.

[0011] Converter gas contains a high content of CO and can be used as a raw material for the preparation of high value-added chemical products. It is an important secondary energy source in the steel industry because of its high economic and environmental value. How to recover and utilize the heat energy in these flue gases, improve the energy efficiency and economic benefits of steelmaking enterprises, reduce environmental pollution, and promote sustainable development is a technical problem that needs to be solved urgently.

[0012] In the existing catalytic conversion of converter gas, most of them are in the form of fixed bed. By loading an excess amount of catalyst in the fixed bed, the converter gas undergoes a reduction reaction when flowing through the catalyst bed, converting CO 2 O is consumed in the process of reduction to CO 2 , reduce O 2 And increase the CO content.

[0013] However, the fixed bed catalytic reaction device needs to regularly replace the failed catalyst bed, and it is difficult to ensure sufficient contact between the converter gas and the catalyst, and the conversion efficiency of the converter gas cannot be effectively guaranteed. The catalytic reduction reaction needs to be carried out under high temperature conditions, and how to make full use of the heat in the converter gas for reaction and convert the converter gas before the downstream dust removal and cooling process of the converter gas is also a technical aspect that needs to be considered. Utility Model Content

[0014] The purpose of this application is to provide a high-efficiency converter gas recovery device that can convert the self-components in the converter gas into CO with a higher calorific value, thereby reducing the CO 2 The emissions are reduced, the converter gas is fully recovered, the calorific value of the converter gas is increased, and the amount of gas combustion emissions is reduced, achieving the green, low-carbon and emission-reduction technical effects to the greatest extent.

[0015] At the same time, it can improve the form of converter gas conversion reaction, so that the coal powder as a catalyst can fully and completely react with the converter gas to ensure the reaction effect and improve CO 2 conversion rate.

[0016] After the conversion reaction, the coal powder can be recovered through the dust removal and cooling process downstream of the converter gas, which can reduce the recovery operation of waste catalysts while effectively utilizing the high-temperature heat of the converter gas.

[0017] In order to achieve the above-mentioned object, in a first aspect, the utility model provides a converter gas efficient recovery device, comprising: a pulverized coal storage device and a pulverized coal feeding device, wherein the pulverized coal in the pulverized coal feeding device is transported to the converter gas flue by pneumatic conveying;

[0018] The pulverized coal feeding device is connected to a variable frequency feeding device, and the variable frequency feeding device is connected to a feeding gas pipeline through a feeding pipeline, and a gas-solid mixer is provided at the joint of the feeding pipeline and the feeding gas pipeline, and a feeding injection assembly is connected to the end of the feeding gas pipeline, and the injection port of the feeding injection assembly extends into the converter gas flue to spray the pneumatically conveyed pulverized coal into the converter gas flue;

[0019] The feed injection assembly includes a plurality of feed injection assemblies, each of which is arranged obliquely relative to the axis of the converter gas flue, and the injection paths of the injection ports are centered and intersect on the axis of the converter gas flue;

[0020] A gas detector capable of detecting the composition of converter gas is installed on the converter gas flue, and the gas detector is arranged downstream of the feed injection assembly;

[0021] The variable frequency feeding device comprises a variable frequency feeding valve, and the variable frequency feeding valve comprises a variable frequency motor and a feeding impeller installed in the feeding pipeline;

[0022] It also includes a control unit, and the variable frequency motor and the gas detector are electrically connected to the control unit respectively.

[0023] In an optional embodiment, the coal powder storage device includes a coal powder storage tank and a coal powder lock hopper, a coal powder lock hopper inlet valve is arranged between the coal powder storage tank and the coal powder lock hopper, the coal powder lock hopper is connected to a nitrogen pipeline, and the nitrogen pipeline is used to fill nitrogen into the coal powder lock hopper, and a lock hopper vent valve is arranged on the top of the coal powder lock hopper.

[0024] In an optional embodiment, the coal powder feeding device includes a coal powder feeding bin, the coal powder lock hopper is connected above the coal powder feeding bin, a feeding bin vent valve is provided on the coal powder feeding bin, a coal powder lock hopper outlet valve is provided between the coal powder feeding bin and the coal powder lock hopper, and the coal powder lock hopper inlet valve, the coal powder lock hopper outlet valve, the lock hopper vent valve and the feeding bin vent valve are all electrically connected to the control unit.

[0025] In an optional embodiment, a flute tube is provided inside the coal powder lock hopper, the coal powder lock hopper includes a conical hopper located at the bottom, the flute tube is arranged around the inner side of the conical hopper, the nitrogen pipeline is connected to the flute tube, the coal powder lock hopper is connected to a nitrogen backflush pipeline, the nitrogen backflush pipeline is connected to the conical hopper, and is arranged tangent to the conical hopper.

[0026] In an optional embodiment, the lock bucket vent valve and the feed bin vent valve are respectively connected to the gas-solid buffer tank through a vent pipe, the gas-solid buffer tank is connected to a pressurized nitrogen pipeline, the pressurized nitrogen pipeline is connected to a blowing nozzle arranged inside the gas-solid buffer tank, the blowing nozzle is used to convert the vented coal powder in the gas-solid buffer tank into a suspended state, and is discharged from the gas-solid buffer tank after pressurized blowing;

[0027] The gas-solid buffer tank is connected to the gas-solid mixer through an ejection pipeline, and is used to eject the emptied buffered coal powder back to the gas-solid mixer.

[0028] In an optional embodiment, the gas-solid mixer includes a shell, the interior of the shell is a Laval tube structure, including a mixer inlet cavity, a mixer mixing cavity and a mixer expansion cavity, an injection pipe is installed inside the mixer inlet cavity, the injection pipe includes an injection straight pipe and a tapered cone pipe, the tail end of the injection straight pipe is connected to the feed gas pipeline, a feed port is provided at the junction of the mixer inlet cavity and the mixer mixing cavity, and the feed pipeline is connected to the feed port;

[0029] The mixer inlet chamber comprises an inlet chamber straight section and an inlet chamber tapered section, the inlet chamber tapered section is directly connected to the mixer mixing chamber, the injection pipe is installed in the mixer inlet chamber, and the head end of the tapered cone tube passes over the inlet chamber straight section and is located at the inlet chamber tapered section, the inlet chamber straight section is provided with an injection reflux port, and the injection pipe is connected to the injection reflux port.

[0030] In an optional embodiment, the feed injection assembly includes a coal powder nozzle and an air flow nozzle of an integrated structure, and the air flow nozzle is arranged on the inner side of the coal powder nozzle and the two are arranged concentrically;

[0031] The coal powder nozzle comprises a gas coal nozzle pipe and a gas coal nozzle head, the gas flow nozzle comprises a gas nozzle pipe and a gas nozzle head, the gas coal nozzle pipe is butt-jointed with the feed gas pipeline, the gas nozzle pipe is connected with an injection gas pipeline, and the injection gas pipeline is used to inject the gas-coal mixture in the gas coal nozzle pipe into the converter gas flue through injection gas;

[0032] The gas nozzle is arranged at the radial inner side of the gas-coal material nozzle, and the gas-coal material nozzle and the gas nozzle together constitute the injection port;

[0033] The gas nozzle pipe is connected to the injection gas pipeline outside the coal powder nozzle, the gas nozzle pipe is vertically extended from the outside of the coal powder nozzle pipe, and the extended part of the gas nozzle pipe is extended in parallel with the coal powder nozzle pipe;

[0034] The gas-coal material nozzle and the gas nozzle respectively include a pointed cone structure, and respectively include a gas-coal material nozzle and a gas nozzle located at the tip. The outer diameters of the gas nozzle pipe and the gas nozzle are smaller than the inner diameter of the gas-coal material nozzle. The gas nozzle is arranged on the axial inner side of the gas-coal material nozzle, and there is at least a gap in the axial direction between the gas nozzle and the gas-coal material nozzle.

[0035] In an optional embodiment, the tip cone angle of the gas coal nozzle is greater than the tip cone angle of the gas nozzle, an annular gap is provided between the gas coal nozzle pipe and the gas nozzle pipe, and the width of the annular gap is not less than half of the outer diameter of the gas nozzle pipe.

[0036] In an optional embodiment, a gradually expanding tube is provided at the central intersection of the feed injection assembly, and the gradually expanding tube is fixed on the axis of the converter gas flue, with a gap left between the gradually expanding tube and the converter gas flue.

[0037] In a second aspect, the utility model provides a method for efficiently recovering converter gas, comprising the following steps:

[0038] The converter gas flows in the converter gas flue, and the pulverized coal is fed by the pulverized coal feeding device and the variable frequency feeding device, and then mixed with the conveying gas in the feeding gas pipeline in the gas-solid mixer and conveyed at an accelerated speed;

[0039] The accelerated coal powder gas mixture is injected into the converter gas flue through the feed injection assembly. The excess coal powder acts as a catalyst to contact the converter gas for conversion reaction. After contacting the excess catalyst, the converter gas undergoes a partial conversion reaction, reducing and eliminating O in the converter gas. 2 , increase the CO content in converter gas;

[0040] The converter gas after the conversion reaction is recovered through the outlet of the converter gas flue.

[0041] The converter gas high-efficiency recovery device and recovery method of the present application transmits the pulverized coal as a catalyst in the pulverized coal feeding device to the converter gas flue through pneumatic conveying, so that the pulverized coal directly participates in the conversion reaction of the converter gas, and can form a fluidized reaction state of the pulverized coal in the converter gas flue. Compared with the reaction form of a fixed bed, the pulverized coal in a fluidized state sprayed into the converter gas flue can contact the converter gas more fully, so that the pulverized coal can more completely undergo a conversion reaction with the converter gas, and can further diffuse along with the flow of the converter gas in the flue, thereby maximizing the CO 2 The conversion rate of O 2 The content.

[0042] When the pulverized coal enters the flue, it can use the high temperature heat of the converter gas to react instantly and convert into CO with high calorific value, so that the solid phase pulverized coal is converted into gas phase in the instantaneous reaction. At the same time, the excess pulverized coal that does not participate in the reaction can be recovered with the converter gas in the downstream cooling and dust removal process, reducing the need for additional recovery and treatment of waste catalysts.

[0043] By pneumatically conveying the pulverized coal into the converter gas flue, the conveying gas and the pulverized coal can be sprayed into the flue at the same time, which strengthens the fluidization state of the pulverized coal and improves the diffusion effect of the pulverized coal in the flue, so that the gas can contact and react with the converter gas more fully and completely.

[0044] The variable frequency feeding device can control the feeding amount of coal powder in the upstream, and control the amount of coal powder added in combination with the component content in the flue. It can control the excess degree of coal powder within a certain range and reduce the load of cooling and dust removal operations downstream of the converter gas.

[0045] By arranging a gas-solid mixer at the junction of the feeding pipeline connected to the variable frequency feeding device and the feeding gas pipeline of the pneumatic conveying, the mixing effect of the feeding gas and the coal powder can be improved, so that the coal powder can be dispersed more evenly in the feeding gas, which is beneficial to the fluidization diffusion after being sprayed into the flue.

[0046] The feed injection assembly connected to the end of the feed gas pipeline extends its injection port into the converter gas flue and sprays the pneumatically conveyed pulverized coal into the converter gas flue, thereby fully ensuring the diffusion injection state of the pulverized coal in the flue. Combined with the flow of the converter gas in the flue and the uniform dispersion of the pulverized coal in the feed gas, the fluidization and diffusion state of the pulverized coal in the flue can be guaranteed to the greatest extent, thereby improving the conversion reaction effect.

[0047] The feed injection assembly includes multiple feed injection assemblies, each of which is inclined relative to the axis of the converter gas flue, which can reduce the scouring of the inner wall of the flue caused by the feed jet flow. The injection path of the injection port is centered and intersected on the axis line of the converter gas flue, which can fundamentally avoid the injection scouring of the inner wall of the flue. At the same time, different feed jet flows can collide at the centered intersection to form a flow state of blasting turbulence. The mutual interference of different feed jet flows can further enhance the diffusion effect.

[0048] A gas detector capable of detecting the content of different components in the converter gas is installed on the converter gas flue. The gas detector is arranged downstream of the feed injection assembly. Combined with the variable frequency motor included in the variable frequency feeding device and the feeding impeller installed in the feeding pipe, the rotation speed of the variable frequency motor and the feeding impeller can be adjusted in a targeted manner according to the different component contents, thereby controlling the feed amount of coal powder.

[0049] By electrically connecting the variable frequency motor and the gas detector to the control unit respectively, the control unit can receive the different composition contents of the converter gas detected by the gas detector, and further control and adjust the operating state of the variable frequency motor based on the composition content of the converter gas, thereby finally forming a control loop of dynamic detection and control feedback, which is conducive to controlling the feed amount of coal powder.

[0050] The high-efficiency converter gas recovery device in this application can reduce or even eliminate the O in the flue gas. 2 content, making the converter gas with high risk factors enter a safe range, achieving hazardous waste management while improving the safety of converter gas recovery. 2 Direct instantaneous conversion reaction with coal powder reduces CO in converter gas 2 content, increase CO production and reduce CO 2 It can reduce emissions, increase the calorific value of converter gas, fully recover converter gas, reduce gas combustion emissions, avoid direct emissions of converter gas causing pollution to the atmosphere, and achieve green, low-carbon, and emission-reduction technical effects to the greatest extent.

[0051] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 This is a schematic diagram of the process structure of the converter gas high-efficiency recovery device in this application;

[0054] Figure 2 This is a schematic diagram of the installation structure of the flute pipe in the coal powder lock bucket;

[0055] Figure 3 It is a structural schematic diagram of a gas-solid mixer;

[0056] Figure 4 It is a schematic diagram of the structure of the feed injection assembly.

[0057] icon:

[0058] 1-coal powder feeding device; 11-coal powder storage tank; 12-coal powder lock hopper; 13-coal powder lock hopper inlet valve; 14-nitrogen pipeline; 15-lock hopper vent valve; 15a-flute pipe; 15b-nitrogen backflush pipeline; 16-coal powder feeding bin; 17-feeding bin vent valve; 18-coal powder lock hopper outlet valve;

[0059] 2-gas-solid mixer; 21-shell; 21a-inlet chamber of mixer; 21b-mixing chamber of mixer; 21c-expansion chamber of mixer; 21d-feeding port; 21e-injection reflux port; 22-injection pipe; 22a-injection straight pipe; 22b-cone tube with tapered tip;

[0060] 3-feed injection assembly; 31-coal powder nozzle; 31a-gas coal nozzle pipe; 31b-gas coal nozzle head; 31c-gas coal nozzle; 32-air flow nozzle; 32a-gas nozzle pipe; 32b-gas nozzle; 32c-gas nozzle;

[0061] 4-converter gas flue; 41-gas detector;

[0062] 5- variable frequency feeding valve; 51- variable frequency motor;

[0063] 6-gas-solid buffer tank; 61-venting pipeline; 62-pressurized nitrogen pipeline; 63-blowing nozzle; 64-injection pipeline;

[0064] 7-Feeding gas pipeline;

[0065] 8- injection gas pipeline;

[0066] 9- Gradually expanding tube. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0068] In the description of this application, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0069] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0070] The high-efficiency converter gas recovery device in the present application mainly disperses and mixes the pulverized coal by pneumatic conveying, and at the same time, injects the pulverized coal into the converter gas in the form of injection to form fluidized diffusion of the pulverized coal in the converter gas. Combined with the flow of the converter gas in the converter gas flue, the fluidized and diffused pulverized coal is fully contacted with the converter gas, and the high-temperature heat of the converter gas is used to make the pulverized coal injected into the flue and the CO in the converter gas 2 and O 2 Instantaneous gas-solid reaction to make CO 2 and O 2 Converted into CO with higher calorific value.

[0071] See also Figure 1 , and combined with Figure 2-Figure 4 The converter gas efficient recovery device in the utility model mainly comprises a pulverized coal storage device, a pulverized coal feeding device 1, a gas-solid mixer 2 and a feed injection assembly 3.

[0072] The pulverized coal in the pulverized coal feeding device 1 is transported to the converter gas flue 4 by pneumatic conveying, and is injected into the flue through the feed injection assembly 3 .

[0073] During the coal powder transportation process, the coal powder feeding device 1 is connected to a variable frequency feeding device, which is connected to a feeding gas pipeline 7 through a feeding pipeline. A gas-solid mixer 2 is provided at the connection between the feeding pipeline and the feeding gas pipeline 7.

[0074] The feeding pipeline is mainly used to introduce the coal powder material output by the variable frequency feeding device into the gas-solid mixer 2, and the feeding gas pipeline 7 is mainly used to introduce feeding gas into the gas-solid mixer 2. The feeding gas is specifically in the form of nitrogen. By introducing nitrogen and coal powder into the gas-solid mixer 2 respectively, the coal powder can be mixed in the nitrogen and transported under the pressure of nitrogen.

[0075] By setting the gas-solid mixer 2, nitrogen and coal powder can be fully mixed in the gas-solid mixer 2, and the coal powder can be evenly dispersed in the nitrogen inside the gas-solid mixer 2, which is conducive to obtaining a feed jet flow with evenly dispersed coal powder.

[0076] The feed injection assembly 3 is specifically connected to the end of the feed gas pipeline 7, and the injection port of the feed injection assembly 3 extends into the converter gas flue 4, so that the pneumatically conveyed coal powder, especially the coal powder evenly dispersed in the nitrogen in the gas-solid mixer 2, is injected into the converter gas flue 4, which is beneficial to realize the fluidization diffusion of the feed jet after entering the flue.

[0077] The feed injection assembly 3 includes a plurality of feed injection assemblies 3, which are evenly arranged in the circumferential direction at the same height of the converter gas flue 4 to improve the uniformity of the coal powder entering the flue.

[0078] In order to reduce the scouring friction caused by the feed jet flow on the inner wall of the flue, each feed injection assembly 3 is arranged to be inclined relative to the axis of the converter gas flue 4. Preferably, each feed injection assembly 3 sprays upwardly in the downstream flow direction of the converter gas, so that the coal powder entering the flue can be further diffused along the flow direction of the converter gas, which is conducive to forming a fluidized diffusion state.

[0079] The injection paths of the injection ports of each feed injection assembly 3 intersect in the center on the axial line of the converter gas flue 4, so that the feed jet flows can intersect in the center inside the converter gas flue 4, forming mutually offsetting blasting impact flows at the intersection position, which is beneficial for the coal powder to diffuse to the periphery in the formed blasting impact flow part.

[0080] This arrangement reduces the impact friction of the feed jet on the flue inner wall on the one hand, and enables the feed jets from different flow paths to converge and impact, forming an explosive impact flow that is conducive to further diffusion, thereby further ensuring the dispersion and fluidization of the coal powder.

[0081] Based on the fact that after the pulverized coal enters the converter gas flue 4, it reacts with the CO in the converter gas 2 and O 2 Instantaneous gas-solid reaction to make CO 2 and O 2 After conversion, a gas detector 41 capable of detecting the composition of the converter gas is installed on the converter gas flue 4. By arranging the gas detector 41 downstream of the feed injection assembly 3, the converter gas after conversion can be detected, and the amount of coal powder added can be controlled and adjusted according to the content of different components detected.

[0082] The control and adjustment of the amount of coal powder added is specifically carried out through variable frequency feeding. The variable frequency feeding device includes a variable frequency feeding valve 5. The variable frequency feeding valve 5 includes a variable frequency motor 51 and a feeding impeller installed in the feeding pipe. By controlling the start and stop or the speed of the variable frequency motor 51, the operation and speed of the feeding impeller can be controlled, and coal powder can be added in a targeted manner to minimize the excessive amount of coal powder added while meeting the converter gas conversion efficiency.

[0083] Based on the conversion reaction of the converter gas mentioned above, during normal operation, the coal powder is in an excess state so that the coal powder can fully contact and react with the converter gas. By controlling and adjusting the frequency conversion feeding device, the excess amount of coal powder can be minimized, thereby reducing the processing load of the cooling and dust removal process downstream of the converter gas.

[0084] The conversion reaction makes full use of the high temperature heat of the converter gas, which can reduce the temperature of the converter gas and reduce the load for the downstream flue gas cooling treatment.

[0085] Although the added coal powder can directly participate in the conversion reaction, it needs to be recovered through the downstream dust removal treatment. The present application avoids the recovery of the waste catalyst, which is equivalent to intercepting the excess coal powder that has not reacted through the downstream flue gas dust removal. By obtaining the converter gas component content data based on the gas detector 41, the operating state of the variable frequency feeding device is controlled and adjusted in a targeted manner, which can control the excess coal powder to the minimum and reduce the processing load of the dust removal process downstream of the converter gas to the minimum to the greatest extent.

[0086] The converter gas efficient recovery device in the present application also includes a control unit. By electrically connecting the variable frequency motor 51 and the gas detector 41 to the control unit respectively, the control angle of the above-mentioned coal powder feed amount can be achieved, and a dynamic monitoring feedback process can be realized.

[0087] In one specific embodiment, the coal powder storage device includes a coal powder storage tank 11 and a coal powder lock hopper 12, a coal powder lock hopper inlet valve 13 is arranged between the coal powder storage tank 11 and the coal powder lock hopper 12, the coal powder lock hopper 12 is connected to a nitrogen pipeline 14, the nitrogen pipeline 14 is used to fill nitrogen into the coal powder lock hopper 12, and a lock hopper vent valve 15 is arranged on the top of the coal powder lock hopper 12.

[0088] The coal powder feeding device 1 includes a coal powder feeding bin 16, a coal powder lock hopper 12 is connected above the coal powder feeding bin 16, a feeding bin vent valve 17 is arranged on the coal powder feeding bin 16, a coal powder lock hopper outlet valve 18 is arranged between the coal powder feeding bin 16 and the coal powder lock hopper 12, and the coal powder lock hopper inlet valve 13, the coal powder lock hopper outlet valve 18, the lock hopper vent valve 15 and the feeding bin vent valve 17 are all electrically connected to the control unit.

[0089] The pulverized coal obtained by grinding the upstream coal pulverizing unit is stored in the pulverized coal storage tank 11. When the pulverized coal lock hopper 12 is at normal pressure, the pulverized coal lock hopper outlet valve 18 is closed, and the pulverized coal lock hopper inlet valve 13 is opened to allow the pulverized coal in the pulverized coal storage tank 11 to flow into the pulverized coal lock hopper 12 by gravity. After the pulverized coal lock hopper is full, the pulverized coal lock hopper inlet valve 13 is closed, and nitrogen is introduced into the pulverized coal lock hopper 12 through the nitrogen pipeline 14 to pressurize it, and then the pulverized coal lock hopper outlet valve 18 is opened to allow the pulverized coal to flow into the pulverized coal feeding bin 16 by gravity. After unloading, the pulverized coal lock hopper outlet valve 18 is closed, and the nitrogen is discharged to normal pressure through the hopper vent valve 15, and the above process is repeated.

[0090] During the nitrogen pressurization process, 1.0Mpa (G) nitrogen is introduced and pressurized to 0.8-0.9Mpa (G), and the pressure in the coal powder lock hopper 12 is made greater than the pressure of the coal powder feeding bin 16 by no more than 0.05MPa (G). Then, the coal powder lock hopper outlet valve 18 is opened to allow the coal powder to flow into the coal powder feeding bin 16 by gravity.

[0091] The nitrogen in the pulverized coal feeding bin 16 can be vented by means of the vent valve 17 provided on the pulverized coal feeding bin 16 , which is beneficial to the inspection and maintenance of the pulverized coal feeding bin 16 .

[0092] In order to realize sequential control operation, the coal powder lock bucket inlet valve 13, coal powder lock bucket outlet valve 18, lock bucket vent valve 15 and feeding bin vent valve 17 in this embodiment are all electrically connected to the control unit, which can realize automatic operation of loading, storing and feeding.

[0093] A flute pipe 15a is provided inside the coal powder lock hopper 12. The coal powder lock hopper 12 includes a conical hopper at the bottom. The flute pipe 15a is arranged around the inner side of the conical hopper. The nitrogen pipeline 14 is connected to the flute pipe 15a. Nitrogen is mainly provided to the inside of the coal powder lock hopper 12 through the flute pipe 15a. During the pressurization and depressurization process of the coal powder lock hopper 12, the flute pipe 15a prevents coal powder or coal ash from sticking to the wall through the purging effect, thereby ensuring that the coal powder can smoothly enter the coal powder feeding bin 16 from the lock hopper.

[0094] At the same time, in order to avoid the blockage and failure of the flute 15a caused by long-term one-way pressurization, a nitrogen backflush pipeline 15b is connected to the coal powder lock hopper. The nitrogen backflush pipeline 15b is connected to the conical hopper and is set tangent to the conical hopper. The nitrogen backflush pipeline 15b can be used to perform reverse blowing in the opposite direction. Combined with the tangential installation, the backflush nitrogen can sweep the inner wall of the conical hopper in a surrounding manner to avoid the adhesion of coal powder to the inner wall of the coal powder lock hopper 12. The backflush nitrogen can be vented through the lock hopper vent valve 15.

[0095] The above-mentioned feed bin vent valve 17 and lock hopper vent valve 15 both carry coal powder for venting during the venting process. In order to utilize the vented coal powder and reduce the special setting of peripheral nitrogen coal powder separation equipment, the lock hopper vent valve 15 and the feed bin vent valve 17 are respectively connected to the gas-solid buffer tank 6 through the vent pipe 61, and the vent air containing coal powder from different parts is received through the gas-solid buffer tank 6.

[0096] This part of coal powder and nitrogen needs to be recovered and circulated to the treatment of converter gas. In order to be able to recycle this part of the material, the material in the gas-solid buffer tank 6 needs to be intermittently pressurized, that is, the gas-solid buffer tank 6 is pressurized without being vented upstream and the pressure in the gas-solid buffer tank 6 does not constitute a back pressure that hinders venting, so that the material inside it forms a gas-solid mixed phase, which is further transported to the gas-solid mixer 2 for mixing.

[0097] Specifically, the gas-solid buffer tank 6 is connected to a pressurized nitrogen pipeline 62, which is connected to a blowing nozzle 63 arranged inside the gas-solid buffer tank 6. The blowing nozzle 63 is used to convert the emptied coal powder in the gas-solid buffer tank 6 into a suspended state, and then it is discharged from the gas-solid buffer tank 6 after pressurized blowing.

[0098] In order to realize the transportation of the coal powder in the gas-solid buffer tank 6 , the gas-solid buffer tank 6 is connected to the gas-solid mixer 2 through an ejection pipe 64 , which is used to eject the emptied buffered coal powder back to the gas-solid mixer 2 .

[0099] The connection between the pressurized nitrogen pipeline 62 and the blowing nozzle 63 can avoid the deposition of coal powder in the gas-solid buffer tank 6, and can return to the gas-solid mixer 2 in the form of induced reflux. The nitrogen blowing nozzle 63 can be used to blow the coal powder deposited in the gas-solid buffer tank 6 into a suspended state, that is, to ensure that the nitrogen is discharged and the coal powder is in a relatively dispersed state of gas-solid mixing to form an induced reflux and return to the gas-solid mixer 2.

[0100] In another specific embodiment, the gas-solid mixer 2 includes a shell 21, the interior of the shell 21 is constructed as a Laval tube structure, and the inner cavity of the Laval tube structure is mainly used to transport the mixture of nitrogen and coal powder.

[0101] The inner cavity of the Laval tube structure includes a mixer inlet cavity 21a, a mixer mixing cavity 21b and a mixer expansion cavity 21c. An injection pipe 22 is installed inside the mixer inlet cavity 21a. The injection pipe 22 includes an injection straight pipe 22a and a tapered cone pipe 22b. The tail end of the injection straight pipe 22a is connected to the feed gas pipeline 7. A feed port 21d is provided at the connecting portion between the mixer inlet cavity 21a and the mixer mixing cavity 21b, and the feeding pipeline is connected to the feed port 21d.

[0102] During the material transportation process, a primary supply of 1.0Mpa (G) nitrogen is added through the feeding gas pipeline 7. The nitrogen injected by the injection pipe 22 can reach the speed of sound at the end of the mixer inlet chamber 21a. Then, through the negative pressure formed at the junction of the mixer inlet chamber 21a and the mixer mixing chamber 21b, the falling coal powder at the feed port 21d is sucked into the gas-solid mixer 2. Under the action of the nitrogen injection at the speed of sound, the coal powder is sucked into the nitrogen jet flow, forming a dynamic gas-solid mixing effect.

[0103] The mixer inlet chamber 21a includes an inlet chamber straight section and an inlet chamber tapered section, and the inlet chamber tapered section is directly connected to the mixer mixing chamber 21b. During the injection process of high-speed fluid, especially nitrogen, after being ejected at the tip nozzle of the tapered cone tube 22b of the injection pipe 22, when entering the inlet chamber tapered section of the mixer inlet chamber 21a, it can combine the high-speed injection and the structure of the inlet chamber tapered section at the same time, and form a suction negative pressure at the throat where the mixer mixing chamber 21b and the mixer inlet chamber 21a are connected, so that the coal powder is continuously sucked into the mixer mixing chamber 21b, so that the coal powder and nitrogen are mixed in gas-solid manner, and the coal powder is dispersed in the nitrogen jet flow through the dynamically obtained suction flow state, thereby improving the gas-solid mixing effect.

[0104] The coal powder at the feed port 21d is vacuum adsorbed by the high-pressure nitrogen injection at the junction of the mixer inlet chamber 21a of the Laval tube and the mixer mixing chamber 21b, so that the coal powder discharged by the variable frequency feeding valve 5 can be fed normally, and after being evenly dispersed in the gas-solid mixer 2, it forms a feed jet flow and is injected into the converter gas flue 4.

[0105] From the perspective of recovering the emptied materials, the injection pipe 22 is installed in the mixer inlet chamber 21a, and the head end of the tapered cone tube 22b passes over the straight section of the inlet chamber and is located at the tapered section of the inlet chamber. The injection of nitrogen at the tip of the tapered cone tube 22b can form a negative pressure at the tip of the injection pipe 22. The negative pressure formation of this part is different from the negative pressure formation at the junction of the mixer inlet chamber 21a and the mixer mixing chamber 21b. Instead, through the injection of nitrogen at the tip of the tube, the straight section of the inlet chamber forms a vacuum negative pressure equivalent to the nitrogen injection of the injection pipe 22. Combined with the ejection reflux port 21e set in the straight section of the inlet chamber, and the connection between the ejection pipe 64 and the ejection reflux port 21e, the dispersed material formed by the gas-solid buffer tank 6 enters the ejection reflux port 21e in the form of ejection reflux.

[0106] Furthermore, the reflux material entering the ejector reflux port 21e will merge into the nitrogen jet flow in a vortex-shaped flow state, so that the nitrogen-coal powder mixed fluid that is vortex-shaped is mixed into the main mixed material in the Laval tube.

[0107] By injecting the main fluid and the revolving vortex-shaped mixing and induced reflux coal powder, the mixing effect of conveying nitrogen and coal powder can be improved, and a closed-loop circulation of coal powder in the overall system is formed, thereby ensuring the mixing effect of nitrogen and coal powder to the greatest extent.

[0108] From the perspective of the feed jet entering the converter gas flue 4 , the feed injection assembly 3 includes a coal powder nozzle 31 and an air flow nozzle 32 of an integrated structure. The air flow nozzle 32 is arranged on the inner side of the coal powder nozzle 31 and the air flow nozzle 32 is arranged concentrically with the coal powder nozzle 31 .

[0109] In the structural composition of the above-mentioned feed injection assembly 3, the coal powder nozzle 31 is mainly used to spray out the feed jet flow mixed with coal powder and nitrogen after dispersion and mixing in the gas-solid mixer 2, while the air flow nozzle 32 is mainly used to input secondary nitrogen supply to fully diffuse the feed jet flow after entering the flue.

[0110] The coal powder nozzle 31 includes a gas coal nozzle pipe 31a and a gas coal nozzle 31b, and the air flow nozzle 32 includes a gas nozzle pipe 32a and a gas nozzle 32b. From the injection angle of the above-mentioned different materials, the gas coal nozzle pipe 31a is connected to the feeding gas pipeline 7, and is specifically used to introduce a feed jet flow including coal powder and nitrogen mixed in the gas-solid mixer 2.

[0111] The gas nozzle pipe 32a is connected to a gas injection pipeline 8, which is specifically used to introduce secondary nitrogen supply. The gas injection pipeline 8 is used to inject the gas-coal mixture in the gas-coal nozzle pipe 31a into the converter gas flue 4 through the secondary nitrogen supply.

[0112] Specifically, in order to enable the secondary supply of injection nitrogen to effectively spray the gas-coal mixture in the gas-coal nozzle pipe 31a into the converter gas flue 4, the gas nozzle 32b is arranged on the radial inner side of the gas-coal nozzle 31b, so that the gas-coal nozzle 31b and the gas nozzle 32b together constitute the injection port.

[0113] In order to effectively protect the feed injection assembly 3, the outside of the coal powder nozzle 31 is wrapped with alumina high temperature resistant material. At the same time, in order to enhance the wear resistance, the gas coal nozzle 31b and the gas nozzle 32b are made of INCONEL625 alloy, which can extend the service life of the feed injection assembly 3.

[0114] By arranging the gas nozzle 32b radially inward of the gas-coal nozzle 31b, the secondary supplied nitrogen can be injected at high speed at the gas nozzle 32b, and at the same time, the gas-coal mixture in the annular gap between the gas-coal nozzle pipe 31a and the gas nozzle pipe 32a is injected into the flue.

[0115] Negative pressure can be formed at the gas nozzle 32b, especially at the root of the gas nozzle 32b, that is, at the root annular surface where nitrogen is injected, to form a certain negative pressure, which is beneficial to the convolution and entrainment of the gas-coal mixture.

[0116] The gas nozzle pipe 32a is connected to the injection gas pipeline 8 on the outside of the coal powder nozzle 31. The gas nozzle pipe 32a extends vertically from the outside of the gas-coal nozzle pipe 31a, and the extended part of the gas nozzle pipe 32a extends parallel to the gas-coal nozzle pipe 31a, which is conducive to forming a relatively uniform annular gap between the gas nozzle pipe 32a and the gas-coal nozzle pipe 31a.

[0117] The gas-coal nozzle 31b and the gas nozzle 32b respectively include a pointed cone structure, and respectively include a gas-coal nozzle 31c and a gas nozzle 32c located at the tip, which can increase the flow rate of the gas-coal mixture and the secondary supply nitrogen at the nozzle position, and then spray them out through the gas-coal nozzle 31c and the gas nozzle 32c after the speed is increased.

[0118] The outer diameters of the gas nozzle tube 32a and the gas nozzle head 32b are smaller than the inner diameter of the gas-coal material nozzle 31c, and the gas nozzle 32c is arranged on the axial inner side of the gas-coal material nozzle 31c. Through this arrangement, on the one hand, the annular gap space between the gas nozzle tube 32a and the gas-coal material nozzle tube 31a can be increased to avoid the injection area of ​​the secondary nitrogen supply causing injection obstacles to the gas-coal mixture; on the other hand, it can ensure that the injection annular surface of the nitrogen can completely fall within the area of ​​the gas-coal material nozzle 31c, avoiding the obstruction and rebound reflux of nitrogen at the gas-coal material nozzle 31c.

[0119] There is at least a gap in the axial direction between the gas nozzle 32c and the gas-coal material nozzle 31c, so that the gas-coal mixture can be impacted by the secondary supply nitrogen before being ejected from the gas-coal material nozzle 31c, thereby ensuring that the secondary supply nitrogen carries the gas-coal mixture.

[0120] The tip cone angle of the gas-coal material nozzle 31b is greater than the tip cone angle of the gas nozzle 32b. Combined with the length gap between the gas nozzle 32c and the gas-coal material nozzle 31c, the gas-coal mixture in the annular gap can be effectively mixed with the secondary supply nitrogen, and the auxiliary mixing and dispersion of the gas-coal mixture can be ensured under the premise of fully reducing the injection area of ​​the gas nozzle 32b.

[0121] The width of the annular gap between the gas-coal nozzle pipe 31a and the gas nozzle pipe 32a is not less than half of the outer diameter of the gas nozzle pipe 32a, which can fully ensure the injection amount of the gas-coal mixture and at the same time ensure that the annular gap can constitute sufficient mixing space, which is beneficial to the mixing effect of the secondary supply nitrogen and the gas-coal mixture.

[0122] In order to further diffuse the pulverized coal entering the flue, a gradually expanding pipe 9 is provided at the centering intersection of the feed injection assembly 3. The gradually expanding pipe 9 is arranged downstream of the centering intersection, which can reduce the flow rate of the converter gas and the injected gas-coal mixture and further mix the converter gas and the injected pulverized coal, so as to improve the dispersion effect of the pulverized coal in the flue, especially when it first comes into contact with the converter gas after entering the flue.

[0123] The gradually expanding tube 9 is fixed on the axis of the converter gas flue 4, and a gap is left between the gradually expanding tube 9 and the converter gas flue 4. Through this arrangement, part of the converter gas upstream of the gradually converging tube can pass through the gap between the gradually expanding tube 9 and the converter gas flue 4 and then contact the gas-coal mixture again. The turbulence formed in the gap promotes the contact between the flue gas and coal powder outside the gradually expanding tube 9. In the overall three-dimensional space in the flue, multi-position and multi-faceted contact between coal powder and converter gas is formed, thereby ensuring the conversion of converter gas to the greatest extent.

[0124] The utility model also provides a method for efficiently recovering converter gas, comprising the following steps:

[0125] The converter gas flows in the converter gas flue 4, and the pulverized coal is fed by the pulverized coal feeding device 1 and the variable frequency feeding device, and then mixed with the conveying gas in the feeding gas pipeline 7 in the gas-solid mixer 2 and conveyed at an accelerated speed;

[0126] The accelerated coal powder gas mixture is injected into the converter gas flue 4 through the feed injection assembly 3. The excess coal powder acts as a catalyst to contact the converter gas for conversion reaction. After contacting the excess catalyst, the converter gas undergoes a partial conversion reaction, reducing and eliminating the O in the converter gas. 2 , increase the CO content in converter gas;

[0127] The converter gas after the conversion reaction is recovered through the outlet of the converter gas flue 4.

[0128] By means of the high-efficiency converter gas recovery method of the utility model, the excessive amount of added coal powder can be reduced to the greatest extent, and the load of downstream flue gas treatment can be reduced while ensuring that the converter gas is fully converted.

[0129] After the pulverized coal is fed into the converter gas flue 4, it reacts with the components in the flue to generate CO with a higher calorific value. By converting the components in the converter gas into CO with a higher calorific value, the CO 2 The emissions from converter gas are reduced and all converter gas is recovered, which increases the calorific value of converter gas and reduces the amount of gas combustion emissions.

[0130] The pulverized coal in the utility model is bituminous coal, specifically small-particle pulverized coal with a particle size of ≤200 mesh (about 74 μm). The pulverized coal reacts with the converter gas instantaneously in the environment of 4-1600°C in the converter gas flue to convert the CO in the converter gas into 2 , O 2 Converted to CO. Reduced O in converter gas 2 content, bringing it into a safe range and improving the safety of converter gas recovery.

[0131] The gas detector 41 can detect CO and O in the flue 2 The detected data signal is transmitted to the control unit, which then accurately adjusts the addition of coal powder.

[0132] During operation, online real-time analysis of CO and O in converter gas 2 Specifically, a gas detector 41 is installed downstream of the feed injection assembly 3 and at the outlet of the converter gas flue 4. The gas detector 41 is used to detect CO, O 2 By detecting CO, O 2 The different contents in the converter gas can provide real-time information on the conversion status of the converter gas, providing an objective basis for the normal control of coal powder addition.

[0133] The utility model is also provided with an analysis detection alarm system, which is electrically connected to the control unit, and the control unit is electrically connected to the variable frequency motor 51 of the variable frequency feeding device. The gas detector 41 is mainly used to detect CO and O in the converter gas. 2 The components are transmitted to the control unit. After receiving the detection signal, the control unit calculates the gas components in the converter gas and the amount of coal powder added to confirm whether the amount of coal powder added needs to be adjusted, and then transmits the coal powder adjustment signal to the frequency conversion feeding valve 5, which completes the precise addition of coal powder.

[0134] At the same time, the control unit also transmits the calculated data to the display terminal, enabling the operator to understand and control the changes in the content of each component in the converter gas and the amount of coal powder added in real time.

[0135] In order to ensure the normal operation of efficient recovery of converter gas more stably and reliably, the detection alarm system is analyzed in this application, and the alarm intervals of each component are set. 2 When it is higher than the set value, the sound and light alarm is triggered or the coal powder adding system is stopped, and the signal is transmitted to the display terminal to remind the operator to perform specific operations according to the actual situation.

[0136] It should be noted that, in the absence of conflict, the features in the embodiments of this application may be combined with each other.

[0137] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A converter gas high-efficiency recovery device, characterized in that: include: A pulverized coal storage device and a pulverized coal feeding device, wherein the pulverized coal in the pulverized coal feeding device is transported to the converter gas flue by pneumatic conveying; The pulverized coal feeding device is connected to a variable frequency feeding device, and the variable frequency feeding device is connected to a feeding gas pipeline through a feeding pipeline, and a gas-solid mixer is provided at the joint of the feeding pipeline and the feeding gas pipeline, and a feeding injection assembly is connected to the end of the feeding gas pipeline, and the injection port of the feeding injection assembly extends into the converter gas flue to spray the pneumatically conveyed pulverized coal into the converter gas flue; The feed injection assembly includes a plurality of feed injection assemblies, each of which is arranged obliquely relative to the axis of the converter gas flue, and the injection paths of the injection ports are centered and intersect on the axis of the converter gas flue; A gas detector capable of detecting the composition of converter gas is installed on the converter gas flue, and the gas detector is arranged downstream of the feed injection assembly; The variable frequency feeding device comprises a variable frequency feeding valve, and the variable frequency feeding valve comprises a variable frequency motor and a feeding impeller installed in the feeding pipeline; It also includes a control unit, and the variable frequency motor and the gas detector are electrically connected to the control unit respectively.

2. The converter gas efficient recovery device according to claim 1, characterized in that: The coal powder storage device includes a coal powder storage tank and a coal powder lock hopper. A coal powder lock hopper inlet valve is arranged between the coal powder storage tank and the coal powder lock hopper. The coal powder lock hopper is connected to a nitrogen pipeline, and the nitrogen pipeline is used to fill nitrogen into the coal powder lock hopper. A lock hopper vent valve is arranged on the top of the coal powder lock hopper.

3. The converter gas efficient recovery device according to claim 2, characterized in that: The coal powder feeding device includes a coal powder feeding bin, the coal powder lock hopper is connected above the coal powder feeding bin, a feeding bin vent valve is arranged on the coal powder feeding bin, a coal powder lock hopper outlet valve is arranged between the coal powder feeding bin and the coal powder lock hopper, and the coal powder lock hopper inlet valve, the coal powder lock hopper outlet valve, the lock hopper vent valve and the feeding bin vent valve are all electrically connected to the control unit.

4. The converter gas efficient recovery device according to claim 3, characterized in that: A flute tube is arranged inside the coal powder lock hopper, and the coal powder lock hopper includes a conical hopper located at the bottom. The flute tube is arranged around the inner side of the conical hopper. The nitrogen pipeline is connected to the flute tube. The coal powder lock hopper is connected to a nitrogen backflush pipeline, and the nitrogen backflush pipeline is connected to the conical hopper and is arranged tangent to the conical hopper.

5. The converter gas efficient recovery device according to claim 3, characterized in that: The lock bucket vent valve and the feed bin vent valve are respectively connected to the gas-solid buffer tank through a vent pipe, and the gas-solid buffer tank is connected to a pressurized nitrogen pipeline, and the pressurized nitrogen pipeline is connected to a blowing nozzle arranged inside the gas-solid buffer tank, and the blowing nozzle is used to convert the vented coal powder in the gas-solid buffer tank into a suspended state, and is discharged from the gas-solid buffer tank after pressurized blowing; The gas-solid buffer tank is connected to the gas-solid mixer through an ejection pipeline, and is used to eject the emptied buffered coal powder back to the gas-solid mixer.

6. The converter gas efficient recovery device according to claim 5, characterized in that: The gas-solid mixer comprises a shell, the internal structure of the shell is a Laval tube structure, including a mixer inlet cavity, a mixer mixing cavity and a mixer expansion cavity, an injection pipe is installed inside the mixer inlet cavity, the injection pipe comprises an injection straight pipe and a tapered cone pipe, the tail end of the injection straight pipe is connected to the feeding gas pipeline, a feed port is provided at the connection portion between the mixer inlet cavity and the mixer mixing cavity, and the feeding pipeline is connected to the feed port; The mixer inlet chamber comprises an inlet chamber straight section and an inlet chamber tapered section, the inlet chamber tapered section is directly connected to the mixer mixing chamber, the injection pipe is installed in the mixer inlet chamber, and the head end of the tapered cone tube passes over the inlet chamber straight section and is located at the inlet chamber tapered section, the inlet chamber straight section is provided with an injection reflux port, and the injection pipe is connected to the injection reflux port.

7. The converter gas efficient recovery device according to claim 5, characterized in that: The feed injection assembly comprises a coal powder nozzle and an air flow nozzle of an integrated structure, wherein the air flow nozzle is arranged on the inner side of the coal powder nozzle and the two are arranged concentrically; The coal powder nozzle comprises a gas coal nozzle pipe and a gas coal nozzle head, the gas flow nozzle comprises a gas nozzle pipe and a gas nozzle head, the gas coal nozzle pipe is butt-jointed with the feed gas pipeline, the gas nozzle pipe is connected with an injection gas pipeline, and the injection gas pipeline is used to inject the gas-coal mixture in the gas coal nozzle pipe into the converter gas flue through injection gas; The gas nozzle is arranged at the radial inner side of the gas-coal material nozzle, and the gas-coal material nozzle and the gas nozzle together constitute the injection port; The gas nozzle pipe is connected to the injection gas pipeline outside the coal powder nozzle, the gas nozzle pipe is vertically extended from the outside of the coal powder nozzle pipe, and the extended part of the gas nozzle pipe is extended in parallel with the coal powder nozzle pipe; The gas-coal material nozzle and the gas nozzle respectively include a pointed cone structure, and respectively include a gas-coal material nozzle and a gas nozzle located at the tip. The outer diameters of the gas nozzle pipe and the gas nozzle are smaller than the inner diameter of the gas-coal material nozzle. The gas nozzle is arranged on the axial inner side of the gas-coal material nozzle, and there is at least a gap in the axial direction between the gas nozzle and the gas-coal material nozzle.

8. The converter gas efficient recovery device according to claim 7, characterized in that: The tip cone angle of the gas coal material nozzle is greater than the tip cone angle of the gas nozzle, an annular gap is provided between the gas coal material nozzle pipe and the gas nozzle pipe, and the width of the annular gap is not less than half of the outer diameter of the gas nozzle pipe.

9. The converter gas efficient recovery device according to claim 2, characterized in that: A gradually expanding pipe is arranged at the central intersection of the feed injection assembly, and the gradually expanding pipe is fixed on the axis of the converter gas flue, and a gap is left between the gradually expanding pipe and the converter gas flue.

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