Converter gas dry recovery system

Abstract

The present invention relates to the technical field of gas recovery, and proposes a dry recovery system for converter gas, including a fire catcher, the fire catcher having a fire inlet and a smoke outlet, a cooling flue leading to the fire inlet, the smoke outlet connected to one end of a high-temperature flue, a waste heat recovery device having an air inlet and an air outlet, the other end of the high-temperature flue connected to the air inlet, a drainage flue, and the air outlet connected to one end of the drainage flue. Through the above technical solution, the problems of high moisture content and low calorific value, large water consumption, high energy consumption, and secondary pollution of converter gas recovery in the prior art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of coal gas recovery, and in particular to a converter coal gas dry recovery system. Background Art

[0002] OG wet flue gas purification process: 1600℃ converter flue gas is cooled to about 800℃ through the vaporization cooling flue, and then sprayed with a large amount of water to cool it down to 70℃ and dedusted and purified in the first and second flues. The purified flue gas is sent to the three-way switching valve station through the induced draft fan. Flue gas with qualified CO content enters the gas recovery system, and flue gas that does not meet the requirements of gas recovery enters the venting tower for ignition and discharge. The dust collected by this flue gas purification process is in the form of sludge and sewage, so it is called wet method. The dust content of OG wet purified flue gas is 50-100mg / Nm3. OG wet flue gas has the problems of high water content, low calorific value, large water consumption, high energy consumption, and secondary pollution.

[0003] LT dry flue gas purification process: 1600℃ converter flue gas is cooled to about 800℃ through the vaporization cooling flue, enters the evaporative cooler to control the water spray to cool down to 200℃, and then is purified by the electrostatic precipitator. The purified flue gas is sent to the three-way switching valve station through the induced core fan. Flue gas with qualified CO content enters the gas recovery system, and flue gas that does not meet the gas recovery requirements enters the venting tower for ignition and emission. The dust collected by this flue gas purification process is dry powder, so it is called dry method. The dust content of LT dry purification flue gas is 10-30mg / Nm3. There are problems such as high water content of coal gas (greater than 7%), low calorific value and high energy consumption. Summary of the invention

[0004] The present invention proposes a converter gas dry recovery system, which solves the problems in the related art of high moisture content, low calorific value, large water consumption, high energy consumption and secondary pollution of converter gas recovery.

[0005] The technical solution of the present invention is as follows:

[0006] Converter gas dry recovery system, including

[0007] A fire catcher, the fire catcher having a fire inlet and a smoke outlet,

[0008] a cooling flue, the cooling flue leading to the pyrotechnic inlet,

[0009] A high-temperature flue, wherein the flue gas outlet is connected to one end of the high-temperature flue,

[0010] A waste heat recovery device, wherein the waste heat recovery device has an air inlet and an air outlet, and the other end of the high-temperature flue is connected to the air inlet.

[0011] The air outlet is connected to one end of the flue gas duct.

[0012] As a further technical solution, it also includes

[0013] The other end of the exhaust duct is connected to the dust collector.

[0014] A clean air pipeline, one end of which is connected to the dust collector,

[0015] The other end of the clean gas pipeline is connected to the separation device, and the separation device has a vent and a gas tank.

[0016] As a further technical solution, it also includes

[0017] A cooling pipe, wherein the cooling pipe is wound around the cooling flue, the high-temperature flue and the waste heat recovery device,

[0018] A rising pipe, the water cooling pipe and the cooling pipe are both connected to the rising pipe,

[0019] A steam drum, the riser is connected to the steam drum,

[0020] A downcomer, one end of which is connected to the steam drum, and the other end of which is communicated with the cooling pipe and the water-cooling pipe.

[0021] As a further technical solution, the fire catcher comprises:

[0022] An outer cylinder, wherein the outer cylinder has a cavity, wherein the cavity has a fireworks inlet and an ash discharge port, wherein the fireworks inlet is located at one side of the cylinder, and the ash discharge port is located at the bottom of the cylinder;

[0023] An inner cylinder body, wherein the inner cylinder body is arranged in the cavity and has an inner cylinder cavity, wherein the inner cylinder cavity is connected to the cavity, wherein the inner cylinder cavity has a smoke outlet, wherein the smoke outlet is located outside the outer cylinder body, wherein the smoke and fire inlet faces the outer wall of the inner cylinder body, and wherein the lower end of the inner cylinder body is lower than the lower end of the smoke and fire inlet.

[0024] An ash hopper, wherein the ash discharge port is arranged on the ash hopper.

[0025] As a further technical solution, the water cooling pipe is arranged in the fire catcher, and the water cooling pipe is arranged in the outer cylinder, the inner cylinder and the ash hopper.

[0026] As a further technical solution, the fire catcher comprises

[0027] Anchor nails, the anchor nails are evenly arranged on the outer wall of the water cooling tube, and the anchor nails are Y-shaped.

[0028] The wear-resistant refractory casting material layer, the water-cooling pipes are distributed on the wear-resistant refractory casting material layer, the anchor nails are arranged inside the wear-resistant refractory casting material layer, and the outer cylinder, the inner cylinder and the ash hopper are all surrounded by the wear-resistant refractory casting material layer.

[0029] As a further technical solution, the lower end of the inner cylinder has an annular portion, and the fire catcher further includes a first annular tube, which is arranged in the annular portion, the longitudinal cross-sectional diameter of the annular portion is greater than the wall thickness of the inner cylinder, and the first annular tube is connected to the water cooling tube;

[0030] The outer diameter of the outer cylinder is smaller than the diameter of the upper end of the ash hopper, and the lower end of the outer cylinder is smoothly connected to the upper end of the ash hopper. The fire catcher also includes a second annular tube, which is arranged on the outer wall of the upper end of the ash hopper and is connected to the water cooling tube.

[0031] As a further technical solution, the fire catcher also includes

[0032] A conical extension tube, wherein the conical extension tube is arranged at the lower end of the inner cylinder, the lower end of the conical extension tube has an extension tube opening, and the cross-sectional area gradually decreases from top to bottom;

[0033] A spiral stopper, the spiral stopper is arranged on the outer wall of the bottom of the conical extension tube, a spiral groove is formed between the spiral stopper and the conical extension tube, and the spiral groove is located on the outer periphery of the extension tube mouth,

[0034] The cross section of the spiral groove is an inverted V shape.

[0035] As a further technical solution, it also includes

[0036] A heat collecting pipe is provided inside the lower end of the conical extension tube and inside the lower end of the spiral stopper, and the heat collecting pipe is connected to the water cooling pipe.

[0037] As a further technical solution, the heat collecting tube comprises:

[0038] A main pipe, the main pipe is connected in parallel to the water cooling pipe,

[0039] A dispersion pipe, both ends of which are connected to the main pipe, and a plurality of the dispersion pipes are staggered with each other.

[0040] The working principle and beneficial effects of the present invention are:

[0041] In the present invention, the cooling flue directly leads to the smoke inlet of the fire catcher, which is used to guide the high-temperature coal gas discharged from the converter into the fire catcher for preliminary cooling treatment; the coal gas that has been initially purified and cooled inside the fire catcher, after flowing out from the flue gas outlet, will enter the high-temperature flue connected to one end thereof, which is responsible for transmitting the coal gas that has been initially treated but still has a relatively high temperature; the system is equipped with a special waste heat recovery device, which has an air inlet and an air outlet. The other end of the high-temperature flue is connected to the air inlet of the waste heat recovery device, which is used to recover the waste heat in the high-temperature coal gas and convert it into usable energy or other forms of energy; the coal gas that has been treated with waste heat, after flowing out from the air outlet of the waste heat recovery device, is then led to the subsequent processing link or the final purification device before being directly discharged into the atmosphere through the drainage flue, ensuring that the energy is fully utilized in the entire coal gas recovery process and meets environmental emission standards.

[0042] The 1600℃ converter flue gas is cooled to about 800℃ through the vaporization cooling flue. The dust and fire particles in the flue gas with energy greater than the minimum ignition energy of CO are captured and removed by the fire collector, and sent to the waste heat recovery device through the high-temperature flue to be cooled to below 130℃ and then discharged through the drainage flue. Compared with the gas treatment process in the prior art, the fire catcher replaces the evaporative cooler of the LT dry flue gas purification process or takes explosion-proof measures to avoid explosion. The explosion-proof measure is dust removal after cooling, and cannot remove the fire contained in the gas in the gas treatment device, resulting in a high gas explosion venting rate, great difficulty in equipment maintenance, high maintenance costs, and unstable emissions that do not meet standards. The fire catcher fully removes the fire and prevents the fire from entering the subsequent treatment device, resulting in a low converter gas explosion venting rate and high safety. Compared with the evaporative cooler, it can effectively prevent water from contacting the gas, thereby avoiding the high water content and low calorific value of the gas, large water consumption, and high energy consumption. Compared with the OG wet flue gas purification process in the prior art, it solves the problem of secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0044] Figure 1 It is a schematic diagram of the structure of the present invention;

[0045] Figure 2 It is a structural schematic diagram of the fire catcher in the present invention;

[0046] Figure 3 for Figure 2 A magnified view of middle;

[0047] Figure 4 This is another structural schematic diagram of the fire catcher in the present invention from another viewing angle;

[0048] Figure 5 It is a structural schematic diagram of the tapered extension tube in the present invention;

[0049] Figure 6 It is a schematic diagram of the structure of the heat collecting tube in the present invention;

[0050] In the figure: cooling flue 10, high temperature flue 11, waste heat recovery device 12, drainage flue 13, dust collector 14, clean gas pipeline 15, separation device 16, vent 1601, gas cabinet 1602, cooling pipe 17, riser 18, steam drum 19, downcomer 20, fire catcher 1, outer cylinder 2, cavity 201, fireworks inlet 202 , ash discharge port-203, inner cylinder body-3, inner cylinder cavity-301, flue gas outlet-302, ash hopper-4, water cooling pipe-5, anchor nail-6, wear-resistant refractory casting material layer-7, annular part-303, first annular pipe-8, second annular pipe-9, conical extension tube-21, spiral baffle-22, spiral groove-2201, heat collecting pipe-23, main pipeline-2301, dispersion pipe-2302. DETAILED DESCRIPTION

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0052] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0053] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0055] Reference Figure 1~Figure 4 , which is the first embodiment of the present invention, proposes a dry recovery system for converter gas, including a fire catcher 1, the fire catcher 1 has a fire and smoke inlet 202 and a flue gas outlet 302, the cooling flue 10 leads to the fire and smoke inlet 202, the flue gas outlet 302 is connected to one end of the high-temperature flue 11, the waste heat recovery device 12 has an air inlet and an air outlet, the other end of the high-temperature flue 11 is connected to the air inlet, and the air outlet is connected to one end of the drainage flue 13.

[0056] In this embodiment, the cooling flue 10 directly leads to the smoke inlet 202 of the fire catcher 1, which is used to guide the high-temperature coal gas discharged from the converter into the fire catcher 1 for preliminary cooling treatment; the coal gas that has been preliminarily purified and cooled inside the fire catcher 1, after flowing out from the flue gas outlet 302, will enter the high-temperature flue 11 connected to one end thereof, which is responsible for transmitting the coal gas that has been preliminarily treated but still has a relatively high temperature; the system is equipped with a special waste heat recovery device 12, which has an air inlet and an air outlet. The other end of the high-temperature flue 11 is connected to the air inlet of the waste heat recovery device 12, which is used to recover the waste heat in the high-temperature coal gas and convert it into usable energy or other forms of energy; the coal gas after the waste heat recovery treatment, after flowing out from the air outlet of the waste heat recovery device 12, is then led to the subsequent processing link or the final purification device before being directly discharged into the atmosphere through the drainage flue 13, ensuring that the energy is fully utilized in the entire coal gas recovery process and meets the environmental protection emission standards.

[0057] The 1600℃ converter flue gas is cooled to about 800℃ through the vaporization cooling flue 10, and the dust and fire particles in the flue gas with energy greater than the minimum ignition energy of CO are captured and removed by the fire collector 1, and sent to the waste heat recovery device 12 through the high-temperature flue 11 to be cooled to below 130℃, and then discharged through the drainage flue 13. Compared with the gas treatment process in the prior art, the fire catcher 1 replaces the evaporative cooler of the LT dry flue gas purification process or takes explosion-proof measures to avoid explosion. The explosion-proof measure is dust removal after cooling, and cannot remove the fire contained in the gas in the gas treatment device, resulting in a high explosion venting rate of the released gas, great difficulty in equipment maintenance, high maintenance costs, and unstable emissions that do not meet standards. The fire catcher 1 fully removes the fire and prevents the fire from entering the subsequent treatment device, resulting in a low explosion venting rate for the converter gas and high safety. Compared with the evaporative cooler, it can effectively prevent water from contacting the gas, thereby avoiding the high water content and low calorific value of the gas, large water consumption, and high energy consumption. Compared with the OG wet flue gas purification process in the prior art, it solves the problem of secondary pollution.

[0058] Furthermore, a dust collector 14 is included, and the other end of the drainage flue 13 is connected to the dust collector 14.

[0059] The clean air pipeline 15, one end of which is connected to the dust collector 14,

[0060] The separation device 16 , the other end of the clean gas pipeline 15 is connected to the separation device 16 , and the separation device 16 has a discharge port 1601 and a gas tank 1602 .

[0061] In this embodiment, a dust collector 14 is designed: after the coal gas is recovered through waste heat, the other end of the drainage flue 13 is then connected to the dust collector 14. The dust collector 14 is mainly used to remove the remaining dust and other particulate pollutants in the coal gas to ensure that the coal gas reaches a higher cleanliness standard. Clean gas pipeline 15: The purified coal gas is transported through the clean gas pipeline 15, and one end of the clean gas pipeline 15 is sealed and connected to the dust collector 14 to ensure the continuity and efficiency of the purification process. Separation device 16: The other end of the clean gas pipeline 15 is connected to the separation device 16, which is a key device for effectively separating the coal gas components in the system. The separation device 16 usually has two outlets, a vent 1601 and a gas tank 1602. The vent 1601 is used to release the waste gas that has been treated to meet the standards and discharge it safely into the environment; and the gas tank 1602 is used to collect and collect high-quality coal gas that can be recycled. This part of the coal gas can be further transported to the factory for reuse as energy, or stored and sold according to the specified standards.

[0062] Furthermore, it also includes

[0063] The cooling pipe 17 is wound around the cooling flue 10, the high-temperature flue 11 and the waste heat recovery device 12.

[0064] Rising pipe 18, water cooling pipe 5 and cooling pipe 17 are all connected with rising pipe 18,

[0065] Steam drum 19, rising pipe 18 is connected to steam drum 19,

[0066] The downcomer 20 has one end connected to the steam drum 19 and the other end connected to the cooling pipe 17 and the water cooling pipe 5 .

[0067] In this embodiment, a cooling pipe 17 is designed: in order to improve the heat exchange efficiency of the coal gas in the cooling flue 10, the high-temperature flue 11 and the waste heat recovery device 12, a cooling pipe 17 is specially provided in the system, and the cooling pipe 17 is arranged on the surface of these pipes and devices in a winding manner so as to fully absorb and conduct a large amount of heat in the coal gas. Rising pipe 18: the water-cooling pipe 5 and the cooling pipe 17 are interconnected through the rising pipe 18, so that the heat transferred from the cooling pipe 17 and the water-cooling pipe 5 can be quickly converted into steam, realizing the effective recovery of heat energy. Steam drum 19: the rising pipe 18 is further connected to the steam drum 19, and the steam drum 19 plays the role of storing and converting steam in the system. When the heat generated in the cooling pipe 17 and the water-cooling pipe 5 is introduced into the steam drum 19 through the rising pipe 18, high-quality steam can be generated for industrial production or power generation. Downcomer 20: in order to form a closed circulation cooling system, one end of the downcomer 20 is connected to the steam drum 19, and the other end is respectively connected to the cooling pipe 17 and the water-cooling pipe 5. In this way, after the steam is condensed into water in the steam drum 19, it can return to the cooling pipe 17 and the water-cooling pipe 5 through the downcomer 20 to continue heat exchange, thereby achieving efficient recovery and recycling of waste heat.

[0068] The 1600℃ converter flue gas is cooled to about 800℃ through the vaporization cooling flue 10, and the dust and fire particles in the flue gas with energy greater than the minimum ignition energy of CO are captured and removed through the fire collector 1, and sent to the waste heat recovery device 12 through the high-temperature flue 11 to cool down to below 130℃. The waste heat recovery device 12 is an explosion-proof and high-efficiency waste heat boiler. Compared with the LT dry flue gas purification process and the OG wet flue gas purification process in the prior art, which can only collect calorific values ​​above 800℃, and the semi-dry flue gas purification process can only recover calorific values ​​above 350°C at most, this embodiment can collect flue gas from 350℃ to 130℃. ℃ calorific value, further improves the calorific value recovery, reduces energy loss, and reduces the use of resources. The entire process of converter flue gas cooling, cooling and dust removal does not come into direct contact with water. The whole process is dry, and the water content in the flue gas is less than 0.3%. The thermal enthalpy of converter flue gas above 130℃ is all efficiently recovered to produce steam. The steam recovery amount per ton of steel can reach 140-160kg. The dust and fire particles in the converter flue gas with energy greater than the minimum ignition energy of CO are dry-captured and removed at 800℃. There is no ignition energy below the minimum ignition point of CO of 610℃, which eliminates the possibility of explosion and ensures the safety of personnel and equipment.

[0069] Further, the fire catcher 1 comprises:

[0070] The outer cylinder 2 has a cavity 201, and the cavity 201 has a fireworks inlet 202 and an ash discharge port 203. The fireworks inlet 202 is located at one side of the cylinder, and the ash discharge port 203 is located at the bottom of the cylinder;

[0071] The inner cylinder 3 is arranged in the cavity 201, and has an inner cylinder cavity 301. The inner cylinder cavity 301 is connected with the cavity 201, and the inner cylinder cavity 301 has a smoke outlet 302. The smoke outlet 302 is located outside the outer cylinder 2, and the fireworks inlet 202 faces the outer wall of the inner cylinder 3, and the lower end of the inner cylinder 3 is lower than the lower end of the fireworks inlet 202.

[0072] In this embodiment, a fire catcher 1 is designed, and the fire catcher 1 is mainly composed of two parts, namely, an outer cylinder 2 and an inner cylinder 3. The outer cylinder 2 is designed as a hollow structure, forming a cavity 201 for gas flow, and this cavity 201 has two key interfaces, namely, a fireworks inlet 202 and an ash discharge port 203. The fireworks inlet 202 is arranged at one side of the outer cylinder 2, which is convenient for the dust-containing and fire-containing coal gas discharged from the converter to enter; the ash discharge port 203 is located at the bottom of the outer cylinder 2, which is convenient for the subsequent cleaning of accumulated dust and debris. The inner cylinder 3 is nested in the hollow cavity 201 of the outer cylinder 2, and is also provided with an inner cylinder cavity 301, and the inner cylinder cavity 301 is interconnected with the cavity 201 of the outer cylinder 2, so that the coal gas can flow smoothly from the outer cylinder 2 into the inner cylinder 3 for processing. A smoke outlet 302 is provided at the top of the inner cylinder cavity 301, and this outlet extends to the outside of the outer cylinder 2 as a purified coal gas output channel. It is worth noting that the fireworks inlet 202 is deliberately designed to face the outer wall of the inner cylinder 3. The fireworks inlet 202 is tangent to the cylindrical outer surface of the outer wall of the inner cylinder 3, so that the coal gas can flow around the inner wall of the outer cylinder 2 under the action of the outer wall of the inner cylinder 3 and the inner wall of the outer cylinder 2. Larger fires settle under the action of centrifugal force and gravity, thereby improving the efficiency of capturing fires. In addition, the lower end height of the inner cylinder 3 is designed to be lower than the lower end of the fireworks inlet 202. This structural layout is conducive to the natural sedimentation effect of coal gas after entering the inner cylinder 3, which is conducive to the separation and collection of fires and dust, thereby realizing efficient dry recovery of coal gas. Compared with common coal gas purification devices, centrifugal force and gravity are used to separate dust and fire particles in the converter flue gas whose energy is greater than the minimum ignition energy of CO. The equipment body adopts forced circulation cooling, and the forced circulation cooling cooling water is not in direct contact with the flue gas, so as to realize the dry capture and removal of fires in the flue gas. By collecting the fire, the introduction of water or atomized water during the converter gas purification process is avoided, thereby preventing water vapor from reducing the gas purity, eliminating the purification step when the gas purity is low, and reducing the operating cost of gas recovery. The large particles of fire collected by the fire collector 1 are not extinguished by spraying or other water methods, so that the large particles of fire are high-quality dry ash after they are extinguished. The collected dry ash can be directly used in converter steelmaking or other functions without secondary treatment, thereby reducing the recovery cost of dry ash.

[0073] Furthermore, the fire catcher 1 further comprises an ash hopper 4 , and the ash discharge port 203 is arranged on the ash hopper 4 .

[0074] In this embodiment, an ash hopper 4 component is also designed to collect dust. This ash hopper 4 design is cleverly integrated into the structure of the fire catcher 1, and its main function is to carry dust and other solid residues discharged from the cavity 201 of the fire catcher 1. The position of the ash discharge port 203 is carefully set above the ash hopper 4, so that when the converter gas is dry-processed in the fire catcher 1, the carried dust will gradually sink into the ash hopper 4 through the pre-set ash discharge port 203 under the action of gravity. In this way, the ash hopper 4 plays the role of temporarily storing and collecting dust, which is convenient and safe to clean dust in subsequent operations, ensuring the continuity and environmental protection efficiency of the converter gas dry recovery process.

[0075] Furthermore, a water cooling pipe 5 is provided in the fire catcher 1 , and water cooling pipes 5 are provided in the outer cylinder 2 , the inner cylinder 3 , and the ash hopper 4 .

[0076] In this embodiment, the fire catcher 1 is equipped with a water cooling pipe 5, which is arranged in multiple key areas of the fire catcher 1, including the inside of the outer cylinder 2, the inside of the inner cylinder 3 and the inside of the ash hopper 4. The purpose of the design of the water cooling pipe 5 is to quickly reduce the temperature of the high-temperature gas discharged from the converter by circulating cooling water, thereby suppressing the activity of the fire, and at the same time play a certain condensation role on the captured dust, thereby enhancing the overall gas purification effect. The arrangement of the water cooling pipe 5 in the inner and outer cylinders 2 can effectively cool the high-speed flowing gas, prevent potential safety hazards caused by high temperature, and improve the recovery rate of the gas. The arrangement of the water cooling pipe 5 inside the ash hopper 4 helps to reduce the dust temperature, prevent dust accumulation from overheating, and also helps to promote the separation process of dust and gas, ensure the stable operation of the system and improve work efficiency. In this way, the cooling efficiency of the converter gas dry recovery system can be significantly improved, which is more in line with the requirements of modern steel enterprises for energy conservation, environmental protection and safe production.

[0077] Further, the fire catcher 1 comprises

[0078] Anchor nails 6 are evenly arranged on the outer wall of the water cooling tube 5. The anchor nails 6 are Y-shaped.

[0079] The wear-resistant refractory casting material layer 7, the water-cooling pipes 5 are distributed on the wear-resistant refractory casting material layer 7, the anchor nails 6 are arranged inside the wear-resistant refractory casting material layer 7, and the outer cylinder 2, the inner cylinder 3 and the ash hopper 4 are all surrounded by the wear-resistant refractory casting material layer 7.

[0080] In this embodiment, Y-shaped anchor nails 6 are evenly arranged on the outer wall of the water-cooling tube 5 inside the fire catcher 1. The main purpose of this Y-shaped anchor nail 6 is to firmly fix the position of the water-cooling tube 5 in the fire catcher 1 to prevent it from displacement or deformation in a high temperature environment, and at the same time, it can also enhance the heat exchange efficiency between the water-cooling tube 5 and the surrounding medium. Wear-resistant refractory casting material layer 7: In the core part of the entire fire catcher 1, that is, around the water-cooling tube 5, a wear-resistant refractory casting material is used for overall casting and wrapping. The water-cooling tube 5 is distributed in this casting material layer, and is firmly fixed inside the casting material by anchor nails 6, ensuring that the water-cooling tube 5 can still maintain stable performance and a long service life under long-term high-temperature operation. The outer cylinder 2, the inner cylinder 3 and the ash hopper 4 are all constructed of a wear-resistant refractory casting material layer 7, forming a solid and high-temperature resistant shell structure, which can not only effectively withstand the erosion and wear of high-temperature coal gas, but also efficiently cool the coal gas through the internal water cooling pipe 5 system, so as to achieve effective capture of fire and dry recovery of coal gas. Through the refined design of the interior of the fire catcher 1, the reliability and durability of the equipment under extreme working conditions are greatly improved, which effectively guarantees the stable and efficient operation of the converter gas dry recovery system.

[0081] Furthermore, the lower end of the inner cylinder 3 has an annular portion 303 , and the fire catcher 1 also includes a first annular tube 8 , which is arranged in the annular portion 303 . The longitudinal cross-sectional diameter of the annular portion 303 is greater than the wall thickness of the inner cylinder 3 , and the first annular tube 8 is connected to the water-cooling tube 5 .

[0082] In this embodiment, the lower end of the inner cylinder 3 is designed with a unique annular portion 303 structure. In this annular portion 303, a first annular pipe 8 connected to the overall water cooling system is set. Specifically, the diameter of the annular portion 303 at the lower end of the inner cylinder 3 in the longitudinal section is greater than the wall thickness of the inner cylinder 3. This special design increases the area of ​​contact between the gas and the cooling medium when the gas flows through this area, thereby improving the gas cooling speed and the efficiency of extinguishing the fire. The first annular pipe 8 is cleverly embedded and fixed inside the annular portion 303. It is connected to the water cooling pipe 5 in the entire converter gas dry recovery system, so that the gas after the preliminary treatment of the inner cylinder 3 can be further cooled in this annular area. Through the circulation of cooling water in the first annular pipe 8, the high-temperature fire in the gas is effectively cooled and captured, which enhances the safety and efficiency of the gas dry recovery process and ensures the stable operation of the entire system.

[0083] Furthermore, the outer diameter of the outer cylinder 2 is smaller than the diameter of the upper end of the ash hopper 4, and the lower end of the outer cylinder 2 is smoothly connected to the upper end of the ash hopper 4. The fire collector 1 also includes a second annular tube 9, which is arranged on the outer wall of the upper end of the ash hopper 4 and is connected to the water cooling tube 5.

[0084] In this embodiment, the outer diameter of the outer cylinder 2 is smaller than the diameter of the opening at the upper end of the ash hopper 4. Such a structural arrangement enables the lower end of the outer cylinder 2 to form a smooth transition connection with the upper end of the ash hopper 4, reducing the resistance to gas flow and improving the gas circulation efficiency. In addition, the fire catcher 1 also includes a second annular tube 9, which is arranged on the outer wall of the upper end of the ash hopper 4. This design allows the coal gas to be cooled again through the water cooling tube 5 connected to the second annular tube 9 when passing through the ash hopper 4, further enhancing the effect of cooling the coal gas and extinguishing the fire. The second annular tube 9 is interconnected with the water cooling tube 5, so that the circulating cooling water can flow around the upper end of the ash hopper 4, and the rising high-temperature coal gas is surrounded and cooled, thereby ensuring that even the coal gas in the area close to the ash hopper 4 can be effectively cooled and treated, thereby improving the safety and recovery efficiency of the dry recovery of the converter gas. This series of precise designs jointly construct an efficient and safe working environment for the dry recovery system of the converter gas.

[0085] Further, the fire catcher 1 also includes

[0086] The tapered extension tube 21 is arranged at the lower end of the inner cylinder 3. The lower end of the tapered extension tube 21 has an extension tube mouth, and the cross-sectional area gradually decreases from top to bottom.

[0087] In this embodiment, a conical extension barrel is also designed. The function of this conical extension barrel 21 is to enhance the capture effect of tiny sparks or high-temperature particles that may be carried in the converter gas. Due to its special conical design, it can produce a stronger vortex effect when the gas flows, thereby improving the capture efficiency. At the same time, the gradually shrinking cross-section is also conducive to reducing the gas flow rate, causing heavy particles to settle faster and be effectively intercepted in the extension barrel, avoiding fire from entering subsequent equipment to cause safety hazards, and ensuring the safe and stable operation of the entire gas dry recovery system.

[0088] Embodiment 2,

[0089] Reference Figure 5~Figure 6 , which is the second embodiment of the present invention, further, the fire catcher 1 also includes

[0090] The spiral stopper 22 is arranged on the outer wall of the bottom of the conical extension tube 21. A spiral groove 2201 is formed between the spiral stopper 22 and the conical extension tube 21. The spiral groove 2201 is located at the outer periphery of the extension tube mouth.

[0091] The cross section of the spiral groove 2201 is an inverted V shape.

[0092] In this embodiment, a spiral stopper 22 is added to the original fire catcher 1 structure. This spiral stopper 22 is closely attached to the bottom outer wall of the conical extension tube 21, and the two together form a spiral groove 2201 structure, and the spiral groove 2201 is just located at the periphery of the extension tube mouth at the lower end of the conical extension tube 21. Specifically, the spiral groove 2201 between the spiral stopper 22 and the conical extension tube 21 is designed to have an inverted V-shaped cross-sectional shape. Such a design has multiple advantages: Optimizing gas flow: The inverted V-shaped spiral groove 2201 can guide the gas to flow along a spiral trajectory, so that the gas forms a vortex when passing through the conical extension tube 21, increasing the contact time between the gas and the inner wall of the catcher, which is conducive to the sedimentation and extinguishing of the fire. Improving the efficiency of fire capture: The spiral groove 2201 structure with an inverted V-shaped cross section can use the principle of centrifugal force to make the fire and dust in the gas contact more with the tube wall during the spiral descent process, and then be captured and precipitated. Enhanced cooling effect: The spiral groove 2201 design increases the contact area between the gas and the cooling medium. Especially in combination with the water cooling tube 5 system, the inverted V-shaped spiral groove 2201 can help further reduce the gas temperature and increase the possibility of extinguishing the fire, thereby greatly improving the safety and efficiency of the entire fire capture system. Therefore, by adding the spiral stop 22 with an inverted V-shaped cross-section and the spiral groove 2201 at the bottom of the conical extension tube 21, the performance of the converter gas dry recovery system in the fire capture link has been significantly improved.

[0093] Furthermore, it also includes a heat collecting pipe 23 . The lower end of the conical extension tube 21 and the lower end of the spiral stopper 22 are both provided with a heat collecting pipe 23 . The heat collecting pipe 23 is connected to the water cooling pipe 5 .

[0094] In this embodiment, in the converter gas dry recovery system, especially in addition to the design of the conical extension tube 21 and the spiral stopper 22, the system is also provided with a heat collecting pipe 23 element. Specifically, the heat collecting pipe 23 is placed in the internal space at the lower end of the conical extension tube 21, and also extends to the interior of the lower end of the spiral stopper 22. In this way, the heat collecting pipe 23 can cover the high-temperature area through which the gas flows to the greatest extent, and effectively absorb and conduct the heat in the gas. It is worth noting that this heat collecting pipe 23 is interconnected with the water-cooling pipe 5 of the entire system, so that the heat absorbed from the gas can be quickly transferred to the cooling water, thereby realizing efficient heat recovery. This design not only helps to further improve the gas cooling rate and ensure the complete extinguishing of the fire, but also improves the utilization rate of the calorific value.

[0095] Further, the heat collecting tube 23 comprises:

[0096] The main pipe 2301 is connected in parallel to the water cooling pipe 5.

[0097] The dispersion pipe 2302 has two ends connected to the main pipe 2301 and is in a plurality of interlaced configurations.

[0098] In this embodiment, the heat collecting pipe 23 has a main pipe 2301, which is arranged in parallel with the water cooling pipe 5, that is, a coolant circulation system interconnected with each other is formed between the main pipe 2301 and the water cooling pipe 5, which jointly undertakes the task of absorbing heat from the coal gas. In addition, a plurality of dispersion pipes 2302 are branched from the main pipe 2301, and both ends of each dispersion pipe 2302 are connected to the main pipe 2301, and these dispersion pipes 2302 are arranged in a staggered manner. Such a design enables the heat collecting pipe 23 to be more evenly and widely distributed in various key parts through which the coal gas flows, such as the lower end of the conical extension tube 21 and the lower end of the spiral stop 22, so as to maximize the absorption of heat in the coal gas and quickly transfer the heat to the water cooling pipe 5 for heat transfer. Through this efficient heat transfer design, the converter gas dry recovery system can maximize the recovery and utilization of the heat energy of the coal gas while ensuring that the fire is effectively extinguished, thereby improving the overall energy utilization efficiency.

[0099] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. The converter gas dry recovery system is characterized by: include: A fire catcher (1), wherein the fire catcher (1) has a fire inlet (202) and a smoke outlet (302), a cooling flue (10), the cooling flue (10) leading to the pyrotechnic inlet (202), A high-temperature flue (11), wherein the flue gas outlet (302) is connected to one end of the high-temperature flue (11). A waste heat recovery device (12), the waste heat recovery device (12) having an air inlet and an air outlet, the other end of the high-temperature flue (11) being in communication with the air inlet, A flue gas duct (13), wherein the gas outlet is connected to one end of the flue gas duct (13). The fire catcher (1) comprises: An outer cylinder (2), the outer cylinder (2) having a cavity (201), the cavity (201) having a fireworks inlet (202) and an ash discharge port (203), the fireworks inlet (202) being located at one side of the cylinder, and the ash discharge port (203) being located at the bottom of the cylinder; an inner cylinder (3), the inner cylinder (3) being arranged in the cavity (201) and having an inner cylinder cavity (301), the inner cylinder cavity (301) being in communication with the cavity (201), the inner cylinder cavity (301) having a smoke outlet (302), the smoke outlet (302) being located outside the outer cylinder (2), the fireworks inlet (202) facing the outer wall of the inner cylinder (3), and the lower end of the inner cylinder (3) being lower than the lower end of the fireworks inlet (202), An ash hopper (4), wherein the ash discharge port (203) is arranged on the ash hopper (4). A conical extension tube (21), the conical extension tube (21) being arranged at the lower end of the inner cylinder (3), the lower end of the conical extension tube (21) having an extension tube opening, and the cross-sectional area of ​​the conical extension tube (21) gradually decreasing from top to bottom; a spiral stopper (22), the spiral stopper (22) being arranged on the outer wall of the bottom of the conical extension tube (21), a spiral groove (2201) being formed between the spiral stopper (22) and the conical extension tube (21), the spiral groove (2201) being located on the outer periphery of the extension tube opening, The cross section of the spiral groove (2201) is an inverted V shape.

2. The converter gas dry recovery system according to claim 1, characterized in that: Also includes: A dust collector (14), wherein the other end of the drainage flue (13) is in communication with the dust collector (14). a clean air pipeline (15), one end of which is in communication with the dust collector (14). A separation device (16), wherein the other end of the clean gas pipeline (15) is connected to the separation device (16), and the separation device (16) has a discharge port (1601) and a gas tank (1602).

3. The converter gas dry recovery system according to claim 2, characterized in that: Also includes: a cooling pipe (17), wherein the cooling pipe (17) is wound around the cooling flue (10), the high-temperature flue (11) and the waste heat recovery device (12), The rising pipe (18), the water cooling pipe (5) and the cooling pipe (17) are all connected to the rising pipe (18). A steam drum (19), wherein the riser (18) is connected to the steam drum (19). A downcomer (20), one end of the downcomer (20) is connected to the steam drum (19), and the other end is connected to the cooling pipe (17) and the water cooling pipe (5).

4. The converter gas dry recovery system according to claim 3, characterized in that: The water cooling pipe (5) is arranged in the fire catcher (1), and the water cooling pipe (5) is arranged in the outer cylinder (2), the inner cylinder (3), and the ash hopper (4).

5. The converter gas dry recovery system according to claim 4, characterized in that: The fire catcher (1) comprises: Anchor nails (6), the anchor nails (6) are evenly arranged on the outer wall of the water cooling tube (5), and the anchor nails (6) are Y-shaped. The wear-resistant refractory casting material layer (7) is provided, the water cooling pipe (5) is distributed on the wear-resistant refractory casting material layer (7), the anchor nail (6) is arranged inside the wear-resistant refractory casting material layer (7), and the outer cylinder (2), the inner cylinder (3) and the ash hopper (4) are all surrounded by the wear-resistant refractory casting material layer (7).

6. The converter gas dry recovery system according to claim 4, characterized in that: The lower end of the inner cylinder (3) has an annular portion (303), and the fire catcher (1) further comprises a first annular tube (8), the first annular tube (8) being arranged in the annular portion (303), the longitudinal cross-sectional diameter of the annular portion (303) being greater than the wall thickness of the inner cylinder (3), and the first annular tube (8) being in communication with the water cooling tube (5); The outer diameter of the outer cylinder (2) is smaller than the diameter of the upper end of the ash hopper (4), and the lower end of the outer cylinder (2) is smoothly connected to the upper end of the ash hopper (4). The fire source catcher (1) further comprises a second annular tube (9), which is arranged on the outer wall of the upper end of the ash hopper (4) and is connected to the water cooling tube (5).

7. The converter gas dry recovery system according to claim 3, characterized in that: Also includes: A heat collecting pipe (23) is provided inside the lower end of the conical extension tube (21) and inside the lower end of the spiral stopper (22). The heat collecting pipe (23) is connected to the water cooling pipe (5).

8. According to the converter gas dry recovery system of claim 7, the heat collecting pipe (23) comprises: A main pipe (2301), the main pipe (2301) being connected in parallel to the water cooling pipe (5), A dispersion pipe (2302), both ends of which are connected to the main pipe (2301), and there are several dispersion pipes (2302) interlaced with each other.

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