Power generation system capable of utilizing total waste heat of converter flue gas

Abstract

The invention discloses a power generation system capable of utilizing total waste heat of converter flue gas, which relates to the technical field of steelmaking and comprises a first-stage waste heat recovery assembly, a second-stage waste heat recovery assembly and a power generation assembly, the first-stage waste heat recovery assembly comprises a hearth with one end connected with a heat insulation flue and the bottom provided with a water cooling wall, converter smoke enters the hearth from the heat insulation flue, and waste heat is combusted and preliminarily released to heat the water cooling wall; the second-stage waste heat recovery assembly comprises a superheater, a reheater and a coal economizer and further recovers residual waste heat. According to the technical scheme, in the process that converter flue gas flows from the first-stage waste heat assembly to the second-stage waste heat assembly, waste heat is absorbed by the water cooling wall, the superheater, the reheater and the economizer, and when a condensate pump conveys water to flow through the water cooling wall, the superheater and the reheater, high-temperature water vapor is formed and flows to the steam turbine assembly; the turbine assembly drives the generator to generate electricity, and full waste heat utilization of the converter flue gas is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of steelmaking technology, and in particular to a power generation system utilizing all waste heat of converter flue gas. Background Art

[0002] Converter steelmaking is currently a very important process in my country's steelmaking process. In recent years, the long process steelmaking process with "blast furnace-converter" as the core has accounted for an increasing proportion of steel production, reaching about 90%. The China Iron and Steel Association has proposed a list of T50 technologies for extreme energy efficiency in the steel industry, including converter flue gas waste heat recovery technology. Converter flue gas contains a large amount of waste heat resources, with a temperature of up to 1600°C, containing a large amount of thermal energy. At the same time, the carbon monoxide component in the flue gas makes it contain a large amount of chemical energy. Therefore, how to utilize waste heat resources and maximize energy utilization is an urgent problem to be solved. Summary of the invention

[0003] The main purpose of the present invention is to propose a power generation system that fully utilizes the waste heat of converter flue gas, aiming to provide a power generation system that fully utilizes the waste heat of converter flue gas.

[0004] To achieve the above-mentioned purpose, the power generation system for utilizing the full waste heat of converter flue gas proposed in the present invention comprises:

[0005] The primary waste heat recovery component comprises a furnace with an insulated flue connected to one end and a water-cooled wall arranged at the bottom, and the converter flue gas enters the furnace from the insulated flue, burns and initially releases waste heat to heat the water-cooled wall;

[0006] A secondary waste heat recovery assembly, including a superheater, a reheater and an economizer, which are arranged in sequence and connected to the downstream of the furnace to further recover the remaining waste heat of the converter flue gas flowing from the furnace to this stage; and,

[0007] A power generation assembly, comprising a condensate pump, a steam turbine assembly and a generator, wherein the condensate pump is used to transport water to the water-cooled wall, and the steam turbine assembly is driven and connected to the generator;

[0008] When water flows through the water-cooled wall, the superheater and the reheater, high-temperature steam is formed and flows to the steam turbine assembly, and the steam turbine assembly drives the generator to generate electricity.

[0009] In one embodiment, the primary waste heat recovery component further includes a first blower, and an output end of the first blower faces the interior of the furnace to provide air to the furnace.

[0010] In one embodiment, the power generation system for utilizing all waste heat of converter flue gas further comprises a calorific value compensation component for maintaining the real-time calorific value stability of the converter flue gas in the furnace;

[0011] The calorific value compensation component comprises:

[0012] A gas tank filled with gas and connected to the furnace;

[0013] a regulating valve, disposed between the gas holder and the furnace, for regulating the gas flow of the gas holder; and

[0014] A sensor for monitoring the heat value in the furnace and electrically connected to the regulating valve; and

[0015] The gas burner is arranged at the bottom of the furnace and is used for burning the gas from the gas tank.

[0016] In one embodiment, the calorific value compensation component further includes a gas heater, which is disposed between the regulating valve and the furnace to heat the gas from the gas tank.

[0017] In one embodiment, the power generation system for full waste heat utilization of converter flue gas further includes a first dust collector, which is arranged between the primary waste heat recovery component and the secondary waste heat recovery component to filter impurities in the boiler flue gas after combustion.

[0018] In one embodiment, the power generation system using all waste heat of converter flue gas further includes a purification treatment component, wherein the purification treatment component includes a denitrification device connected downstream of the economizer to remove nitrogen oxides in the boiler flue gas.

[0019] In one embodiment, the purification component further comprises:

[0020] A second blower, connected to the outlet of the denitration device, for driving the boiler flue gas to move in a downstream direction;

[0021] An air preheater, arranged at the air inlet of the second blower, for heating the incoming air;

[0022] a second dust collector, disposed at the air outlet of the second blower, for filtering impurities in the boiler flue gas; and

[0023] The induced draft fan is arranged downstream of the second dust collector and has the same wind direction as the second blower to assist the boiler flue gas to move downstream.

[0024] In one embodiment, the purification component further comprises:

[0025] a desulfurization tower, arranged at the air outlet of the induced draft fan, for removing sulfur oxides in the boiler flue gas; and

[0026] The chimney is arranged in a long shape and is connected to the desulfurization tower. The purified converter flue gas is discharged into the atmosphere from the chimney.

[0027] In one embodiment, the power generation assembly further includes a low-pressure heater, a deaerator, a feedwater pump, a high-pressure heater and a steam drum, which are arranged and connected in sequence after the condensate pump to form a passage for conveying water to the water-cooled wall in the furnace to heat and generate high-temperature steam;

[0028] Wherein, the steam drum is connected to the steam turbine assembly.

[0029] In one embodiment, the power generation component further includes a condenser, which is disposed between the steam turbine component and the condensate pump, and is used to recover and reuse high-temperature steam.

[0030] The technical solution of the present invention first sends the converter flue gas into the furnace to burn and initially release waste heat, and heats the water-cooled wall, and then the converter flue gas continues to flow from the furnace to the superheater, the reheater and the economizer, thereby continuing to recover the remaining waste heat resources of the converter flue gas; at the same time, the condensate pump transports water to the water-cooled wall, and when the water flows through the water-cooled wall, the superheater and the reheater, it forms high-temperature steam and flows to the turbine assembly, and the turbine assembly drives the generator to generate electricity, thereby realizing the full waste heat utilization of the converter flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0032] Figure 1 This is a structural schematic diagram of an embodiment of a power generation system for fully utilizing the waste heat of converter flue gas provided by the present invention.

[0033] Figure 2 This is a structural schematic diagram of an embodiment of a power generation system for fully utilizing the waste heat of converter flue gas provided by the present invention.

[0034] Description of Figure Numbers:

[0035] 100. Power generation system with full waste heat utilization of converter flue gas; 1. Primary waste heat recovery component; 11. Furnace; 111. Insulation channel; 112. Water-cooled wall; 12. First blower; 2. Secondary waste heat recovery component; 21. Superheater; 22. Reheater; 23. Economizer; 3. Power generation component; 31. Condensate pump; 32. Steam turbine component; 321. High-pressure cylinder; 322. Medium- and low-pressure cylinder; 33. Generator; 34. Low-pressure heater; 3 5. Deaerator; 36. Feed water pump; 37. High-pressure heater; 38. Steam drum; 39. Condenser; 4. Calorific value compensation component; 41. Gas holder; 42. Control valve; 43. Sensor; 44. Gas burner; 45. Gas heater; 5. First dust collector; 6. Purification and treatment component; 61. Denitrification device; 62. Second blower; 63. Air preheater; 64. Second dust collector; 65. Draft fan; 66. Desulfurization tower; 67. Chimney.

[0036] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] Converter steelmaking is currently a very important process in my country's steelmaking process. In recent years, converter steelmaking has accounted for an increasing proportion of steel production, reaching about 90%. The China Iron and Steel Association has proposed a list of T50 technologies for extreme energy efficiency in the steel industry, including converter flue gas waste heat recovery technology. Converter flue gas contains a large amount of waste heat resources, with a temperature of up to 1600°C, containing a large amount of thermal energy. At the same time, the carbon monoxide component in the flue gas makes it contain a large amount of chemical energy. Therefore, how to utilize waste heat resources and maximize energy utilization is an urgent problem to be solved.

[0041] In order to solve the above problems, the present invention proposes a power generation system for fully utilizing the waste heat of converter flue gas, aiming to provide a power generation system for fully utilizing the waste heat of converter flue gas. Figure 1 to Figure 2 A schematic structural diagram of an embodiment of a power generation system for utilizing all waste heat of converter flue gas provided by the present invention.

[0042] Embodiment 1:

[0043] Please refer to Figure 1 to Figure 2 In one embodiment of the present invention, the power generation system 100 for full waste heat utilization of converter flue gas includes a primary waste heat recovery component 1, a secondary waste heat recovery component 2 and a power generation component 3. The primary waste heat recovery component 1 includes a furnace 11 connected to an insulating channel 111 at one end and a water-cooled wall 112 at the bottom. The converter flue gas enters the furnace 11 from the insulating channel 111, burns and initially releases waste heat to heat the water-cooled wall 112; the secondary waste heat recovery component 2 includes a superheater 21, a reheater 22 and an economizer 23, which are arranged in sequence and connected to The downstream of the furnace 11 is used to further recover the remaining waste heat of the converter flue gas from the furnace 11; the power generation component 3 includes a condensate pump 31, a turbine component 32 and a generator 33; the condensate pump 31 is used to transport water to the water-cooled wall 112; the turbine component 32 drives and connects to the generator 33; wherein, when the water flows through the water-cooled wall 112, the superheater 21 and the reheater 22, high-temperature steam is formed and flows to the turbine component 32; the turbine component 32 drives the generator 33 to generate electricity.

[0044] The technical solution of the present invention first sends the converter flue gas into the furnace 11 to burn and initially release waste heat, and heats the water-cooled wall 112, and then the converter flue gas continues to flow from the furnace 11 to the superheater 21, the reheater 22 and the economizer 23, so as to continue to recover the remaining waste heat resources of the converter flue gas; at the same time, the condensate pump 31 transports water to the water-cooled wall 112, and when the water flows through the water-cooled wall 112, the superheater 21 and the reheater 22, it forms high-temperature steam and flows to the turbine assembly 32, so that the turbine assembly 32 drives the generator 33 to generate electricity, thereby realizing the full waste heat utilization of the converter flue gas.

[0045] It can be understood that in order to prevent the temperature of the converter flue gas from dissipating before entering the furnace 11 and causing heat waste, an insulating channel 111 is provided in this embodiment, which is connected to the furnace 11. The converter flue gas enters the furnace 11 from the insulating channel 111. The wall of the insulating channel 111 uses high-temperature resistant materials such as aluminum silicate to ensure that the temperature of the converter flue gas remains almost unchanged after passing through the insulating channel 111, which can effectively prevent the heat of the converter flue gas from escaping and retain as much heat as possible to enter the furnace 11, thereby heating the water transported by the condensate pump 31. Therefore, the waste heat resources of the converter flue gas are further maximized.

[0046] For further information, please refer to Figure 1 to Figure 2 The first-stage waste heat recovery component 1 also includes a first blower 12, and the output end of the first blower 12 faces the interior of the furnace 11 to provide air to the furnace 11. It can be understood that in order to make the carbon monoxide in the converter flue gas burn, oxygen is required. Directly introducing pure oxygen is costly on the one hand and has the risk of explosion on the other hand. Therefore, the first-stage waste heat recovery component 1 also includes the first blower 12, and the output end of the first blower 12 faces the interior of the furnace 11 to provide air to the furnace 11. By directly setting the first blower 12, air is sent into the furnace 11, and then the oxygen in the air is sufficient to make the carbon monoxide in the converter flue gas burn and release heat. At the same time, the converter flue gas is cooled from about 1600°C when it first enters to about 900°C through the cooling effect of the air. Such a setting is low in cost, high in economy, and safer in operation.

[0047] For further information, please refer to Figure 1 to Figure 2The power generation system 100 for utilizing all the waste heat of the converter flue gas also includes a calorific value compensation component 4 for maintaining the real-time calorific value stability of the converter flue gas in the furnace 11; the calorific value compensation component 4 includes a gas tank 41, a regulating valve 42, a sensor 43 and a gas heater 45; the gas tank 41 is filled with gas and is connected to the furnace 11; the regulating valve 42 is arranged between the gas tank 41 and the furnace 11 to adjust the gas flow of the gas tank 41; the sensor 43 is used to monitor the calorific value in the furnace 11 and is electrically connected to the regulating valve 42; the gas heater 45 is arranged between the regulating valve 42 and the furnace 11 to heat the gas from the gas tank 41.

[0048] It is understandable that due to the intermittent nature of converter production, the carbon monoxide content in the converter flue gas fluctuates greatly. In the early and late stages of smelting, the amount of carbon monoxide is almost zero, while during the smelting process, the carbon monoxide content is usually 40-50%, and the maximum value can be as high as 80-90%. Therefore, the converter flue gas in the furnace 11 has the characteristics of discontinuity, flammability and explosion.

[0049] Thus, for the safety consideration of the recovery of waste heat resources from converter flue gas, that is, to avoid the discontinuity problem caused by the fluctuation of the carbon monoxide content in the furnace 11, the power generation system 100 for full waste heat utilization of converter flue gas also includes the calorific value compensation component 4, which is used to maintain the real-time calorific value stability of the converter flue gas in the furnace 11; specifically, the calorific value compensation component 4 includes the gas holder 41, the regulating valve 42, the sensor 43 and the gas burner 44, the gas holder 41 is filled with gas and is connected to the furnace 11, the regulating valve 42 is arranged between the gas holder 41 and the furnace 11, and the sensor 43 is used to monitor the real-time calorific value of the converter flue gas in the furnace 11. Calorific value, and electrically connected to the regulating valve 42, when the calorific value in the furnace 11 is lower than the preset value, that is, the carbon monoxide content in the furnace 11 is low at this time, the regulating valve 42 is opened to allow the gas in the gas holder 41 to be filled into the furnace 11; when the calorific value in the furnace 11 is higher than the preset value, that is, the carbon monoxide content in the furnace 11 is too high at this time, the regulating valve 42 is closed, so that the gas in the gas holder 41 cannot be filled into the furnace 11. In this way, through the setting of the calorific value compensation component 4, the carbon monoxide content in the furnace 11 is kept continuous, thereby having an explosion-proof effect, that is, the waste heat resources of the converter flue gas can be recovered more safely.

[0050] It is understandable that the calorific value compensation component 4 further includes a gas burner 44, which is disposed at the bottom of the furnace 11 and is used to burn the gas from the gas tank 41. It is understandable that even the heated gas cannot reach its own ignition point, so for the convenience of combustion, the mixed converter flue gas and the supplementary gas can be burned. Therefore, the calorific value compensation component 4 further includes the gas burner 44, which is disposed at the bottom of the furnace 11 and is used to burn the gas from the gas tank 41.

[0051] For further information, please refer to Figure 2 , the calorific value compensation component 4 also includes a gas heater 45, which is arranged between the regulating valve 42 and the furnace 11, and is used to heat the gas from the gas holder 41. It can be understood that since the waste heat recovery of the converter flue gas also requires heat storage, that is, the temperature in the furnace 11 should not fluctuate too much as much as possible, which is also the key point for safely recovering the waste heat resources of the converter flue gas. Therefore, the calorific value compensation component 4 also includes the gas heater 45, which is arranged between the regulating valve 42 and the furnace 11, and is used to heat the gas from the gas holder 41, so that the gas is heated to about 120°C and then introduced into the furnace 11, thereby further ensuring the safe recovery of the waste heat resources of the converter flue gas.

[0052] For further information, please refer to Figure 1 , the power generation system 100 for full waste heat utilization of converter flue gas also includes a first dust collector 5, which is arranged between the first-level waste heat recovery component 1 and the second-level waste heat recovery component 2, and is used to filter impurities in the boiler flue gas after combustion. It can be understood that the dust content in the converter flue gas is as high as 150g / Nm, and the main components are Fe2O3, FeO, CaO, SiO2, etc. Therefore, when recovering the waste heat resources in the converter flue gas, dust removal is also a necessary step in safe operation. Specifically, the power generation system 100 for full waste heat utilization of converter flue gas also includes the first dust collector 5, which is arranged between the first-level waste heat recovery component 1 and the second-level waste heat recovery component 2, and is used to filter impurities in the boiler flue gas after combustion, thereby ensuring that the power generation system 100 for full waste heat utilization of converter flue gas safely recovers the waste heat resources of the converter flue gas. It is understandable that the converter flue gas after the first stage of cooling also has a high temperature of 900°C. Therefore, the first dust collector 5 uses ordinary steel built-in refractory materials and can withstand high temperatures close to 1000°C, thereby avoiding the first dust collector 5 from being damaged by high temperature.

[0053] It can be understood that the converter flue gas enters the furnace 11 from the adiabatic channel 111, burns and releases heat, and is cooled from 1600°C to 900°C under the action of the air supplied by the first blower 12 and the water-cooled wall 112. The temperature of the gas provided by the gas tank 41 after combustion by the gas burner 44 is also about 900°C. The two flue gases merge and pass through the first dust collector 5 for dust removal, and then enter the superheater 21 and the reheater 22 for heat exchange, and the temperature of the converter flue gas drops to 500°C.

[0054] In addition, please refer to Figure 1 to Figure 2 , the power generation system 100 for full waste heat utilization of converter flue gas also includes a purification treatment component 6, the purification treatment component 6 includes a denitrification device 61, which is connected to the downstream of the economizer 23 to remove nitrogen oxides in the boiler flue gas. It can be understood that the converter flue gas is discharged from the power generation system 100 for full waste heat utilization of converter flue gas, and contains a large amount of nitrogen oxides. If it is not treated and discharged into the environment, it will cause environmental pollution. Therefore, the power generation system 100 for full waste heat utilization of converter flue gas also includes the purification treatment component 6, the purification treatment component 6 includes the denitrification device 61, which is connected to the downstream of the economizer 23 to remove nitrogen oxides in the boiler flue gas, thereby making the boiler flue gas emission cleaner, thereby protecting the environment. Specifically, the denitrification device 61 adopts the SCR denitrification method, and introduces a large amount of ammonia to generate nitrogen and water from nitrogen oxides, thereby eliminating nitrogen oxides in the converter flue gas.

[0055] For further information, please refer to Figure 1 to Figure 2 The purification treatment component 6 also includes a second air blower 62, an air preheater 63, a second dust collector 64 and an induced draft fan 65; the second air blower 62 is connected to the outlet of the denitrification device 61 to drive the boiler flue gas to move in the downstream direction; the air preheater 63 is arranged at the air inlet of the second air blower 62 to heat the temperature of the incoming air; the second dust collector 64 is arranged at the air outlet of the second air blower 62 to filter impurities in the boiler flue gas; the induced draft fan 65 is arranged downstream of the second dust collector 64, in the same wind direction as the second air blower 62, to assist the boiler flue gas to move in the downstream direction.

[0056] It can be understood that in order to remove nitrogen oxides, the converter flue gas needs further dust removal. Specifically, the purification treatment component 6 also includes the second blower 62, the air preheater 63, the second dust collector 64 and the induced draft fan 65; the second blower 62 is connected to the outlet of the denitrification device 61 to drive the boiler flue gas to move in the downstream direction, the air preheater 63 is arranged at the air inlet of the second blower 62 to heat the temperature of the incoming air, thereby improving the heat exchange efficiency of the converter flue gas, the second dust collector 64 is arranged at the air outlet of the second blower 62, and the impurities in the boiler flue gas are filtered through the second dust collector 64, the induced draft fan 65 is arranged downstream of the second dust collector 64, and is consistent with the wind direction of the second blower 62, to assist the boiler flue gas to move in the downstream direction, thereby accelerating the filtering efficiency of impurities in the boiler flue gas, with such a configuration, the large particle impurities in the converter flue gas are further filtered, thereby ensuring that the discharge into the environment will not cause environmental impacts such as haze. It is understandable that the second dust collector 64 can adopt wet dust removal, electric dust removal, bag dust removal and the like, and the specific dust removal method is not specifically limited here.

[0057] It can be understood that after the converter flue gas enters the superheater 21 and the reheater 22 for heat exchange, the temperature of the converter flue gas drops from 900°C to 500°C, and then enters the economizer 23, the denitrification device 61 and the air preheater 63 in sequence, and the converter flue gas temperature drops to about 150°C.

[0058] For further information, please refer to Figure 1 to Figure 2 The purification treatment component 6 also includes a desulfurization tower 66 and a chimney 67; the desulfurization tower 66 is arranged at the air outlet of the induced draft fan 65 to remove sulfur oxides in the boiler flue gas; the chimney 67 is arranged in an elongated shape and is connected to the desulfurization tower 66, and the purified converter flue gas is discharged into the atmosphere from the chimney 67. It is understandable that the converter flue gas is discharged from the power generation system 100 that fully utilizes the waste heat of the converter flue gas, and it contains a large amount of sulfur oxides. If it is not treated and discharged into the environment, it will cause environmental pollution. Therefore, the purification treatment component 6 also includes the desulfurization tower 66 and the chimney 67; the desulfurization tower 66 is arranged at the air outlet of the induced draft fan 65 to remove sulfur oxides in the boiler flue gas. The chimney 67 is arranged in an elongated shape and is connected to the desulfurization tower 66. The purified converter flue gas is discharged into the atmosphere from the chimney 67. At this time, the discharged converter flue gas is only about 60°C, which means that the efficient utilization of the full waste heat resources in the converter flue gas is achieved.

[0059] In addition, please refer to Figure 1 to Figure 2The power generation assembly 3 further includes a low-pressure heater 34, a deaerator 35, a feed water pump 36, a high-pressure heater 37 and a steam drum 38, which are arranged and connected in sequence after the condensate pump 31, so as to form a passage for the water body to be transported to the water-cooled wall 112 in the furnace 11, so as to be heated to generate high-temperature steam, and stored in the steam drum 38; wherein the steam drum 38 is connected to the steam turbine assembly 32. It can be understood that in order for the generator 33 to generate electricity, specifically, the power generation assembly 3 further includes the low-pressure heater 34, the deaerator 35, the feed water pump 36, the high-pressure heater 37 and the steam drum 38, which are arranged and connected in sequence after the condensate pump 31, so as to form a passage for the water body to be transported to the water-cooled wall 112 in the furnace 11, so as to be heated to generate high-temperature steam, and stored in the steam drum 38; wherein the steam drum 38 is connected to the steam turbine assembly 32.

[0060] For further information, please refer to Figure 1 to Figure 2 The power generation component 3 further includes a condenser 39, which is disposed between the steam turbine component 32 and the condensate pump 31, and is used to recycle and reuse high-temperature water vapor. It can be understood that the high-temperature water vapor enters the steam turbine component 32, thereby making the steam turbine component 32 work, the steam turbine component 32 runs, and drives the generator 33 to generate electricity. At this time, the high-temperature water vapor will cool down and condense into liquid. In order to avoid the waste of water, the power generation component 3 further includes the condenser 39, which is disposed between the steam turbine component 32 and the condensate pump 31, and is used to recycle and reuse high-temperature water vapor, thereby further reducing the cost of the power generation system 100 that fully utilizes the waste heat of the converter flue gas, and improving its economy.

[0061] Embodiment 2:

[0062] This embodiment also provides a process for a power generation system using all waste heat of converter flue gas, with flue gas passing through various devices as a reference object. The process for a power generation system using all waste heat of converter flue gas includes the following steps:

[0063] The converter flue gas flows from the adiabatic channel 111 into the furnace 11 to directly burn and release heat, and air is introduced through the first blower 12 to assist combustion and cool the converter flue gas. Furthermore, the water-cooled wall 112 is provided at the bottom of the furnace 11 to absorb the heat released by the combustion of the converter flue gas, thereby reducing the temperature of the converter flue gas from 1600°C when it initially enters the furnace 11 to 900°C.

[0064] Since the calorific value in the furnace 11 is unstable, the calorific value supplement component 4 is added. Specifically, the sensor 43 monitors the calorific value fluctuation in the furnace 11, and then the regulating valve 42 controls the gas flow from the gas tank 41 to the furnace 11 according to the calorific value fluctuation in the furnace 11. Before the gas flows into the furnace 11, the gas is first heated to 120°C by the gas heater 45 in the gas pipeline, and then ignited and burned by the gas burner 44 to release heat, thereby keeping the calorific value in the furnace 11 always balanced.

[0065] The temperature of the coal gas after combustion is also around 900°C. After that, it is mixed with the converter flue gas and passed through the first dust collector 5 for high-temperature cyclone dust removal. Then, it passes through the superheater 21 and the reheater 22 for heat exchange, and the temperature is reduced to 500°C. Then, it passes through the economizer 23, the denitrification device 61 and the air preheater 63. At this time, the converter flue gas temperature is reduced to 150°C. Finally, it is cooled by the second blower 62 and dusted by the second dust collector 64. Then, the induced draft fan 65 sends the converter flue gas into the desulfurization tower 66 for desulfurization. Finally, it is cooled to 60°C and discharged from the chimney 67.

[0066] Embodiment three:

[0067] This embodiment also provides a process for a power generation system utilizing all waste heat of converter flue gas, with water passing through various devices as a reference object. The process for a power generation system utilizing all waste heat of converter flue gas includes the following steps:

[0068] The condensate pump 31 pumps water through the low-pressure heater 34, the deaerator 35, the feed water pump 36, and the high-pressure heater 37 respectively, wherein the low-pressure heater 34 is used to heat the condensate, which helps to improve the thermal efficiency; the deaerator 35 is used to remove oxygen and other gases from the water body to prevent these gases from causing corrosion and other adverse effects on subsequent devices such as the economizer 23; the feed water pump 36 further provides power to pump the water body to the high-pressure heater 37, and the high-pressure heater 37 further heats the water body, thereby further improving the thermal efficiency, which is beneficial to the safe operation of the turbine assembly 32. At this time, the high-temperature water body enters the economizer 23 again, and the high-temperature water body absorbs the heat in the economizer 23 A part of the water body forms high-temperature water vapor and is collected in the steam drum 38, and another part of the liquid water passes through the steam drum 38 and finally flows to the bottom of the furnace 11, is heated by the water-cooled wall 112 at the bottom of the furnace 11, and then generates high-temperature water vapor and is collected in the steam drum 38 again; the high-temperature water vapor in the steam drum 38 flows to the superheater 21, further absorbs heat to increase the temperature of the water vapor, on the one hand, to reduce the humidity of the high-temperature water vapor to avoid corrosion damage to the blades of the steam turbine assembly 32, and on the other hand, continues to increase the internal energy of the high-temperature water vapor, thereby improving the driving efficiency of the steam turbine assembly 32, and then, the high-temperature water vapor is introduced into the steam turbine assembly 32 to drive the generator 33 to generate electricity.

[0069] Specifically, the steam turbine assembly 32 includes a high-pressure cylinder 321 and a medium- and low-pressure cylinder 322, wherein the high-pressure cylinder 321 and the medium- and low-pressure cylinder 322 are coaxially arranged, and the input ends of the high-pressure cylinder 321 and the medium- and low-pressure cylinder 322 are arranged facing each other, wherein the output end of the medium- and low-pressure cylinder 322 is driven to connect to the generator 33; high-temperature steam is heated by the superheater 21 to form main steam, which flows to the input end of the high-pressure cylinder 321 to drive the blades of the high-pressure cylinder 321 to rotate; and the output end of the high-pressure cylinder 321 will extract high-temperature steam from the high-pressure cylinder 321 into the high-pressure heater 37 to heat the feed water. It can be understood that the high-pressure heater 37 It is a steam-water heat exchanger, the hot medium is the steam extracted from the high-pressure cylinder 321, and the cold medium is feed water. The source of feed water is mainly the exhaust steam of the low-pressure cylinder 322 of the turbine assembly 32 after work is done, and a small part of make-up water; and the low-temperature water vapor flowing out of the output end of the high-pressure cylinder 321 will be heated by the reheater 22, and will form reheated steam after being heated by the reheater 22. Since the reheated steam cannot reach the pressure of the main steam, the reheated steam can only flow to the input end of the medium and low pressure cylinder 322 to drive the medium and low pressure cylinder 322 to rotate, and then the high-pressure cylinder 321 and the medium and low pressure cylinder 322 rotate in the same direction, and then drive the generator 33 to rotate and generate electricity.

[0070] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A power generation system utilizing all waste heat of converter flue gas, characterized in that: include: The primary waste heat recovery component comprises a furnace with an insulated flue connected to one end and a water-cooled wall arranged at the bottom, and the converter flue gas enters the furnace from the insulated flue, burns and initially releases waste heat to heat the water-cooled wall; A secondary waste heat recovery assembly, including a superheater, a reheater and an economizer, which are arranged in sequence and connected to the downstream of the furnace to further recover the remaining waste heat of the converter flue gas flowing from the furnace to this stage; and, A power generation assembly, comprising a condensate pump, a steam turbine assembly and a generator, wherein the condensate pump is used to transport water to the water-cooled wall, and the steam turbine assembly is driven and connected to the generator; When water flows through the water-cooled wall, the superheater and the reheater, high-temperature steam is formed and flows to the steam turbine assembly, and the steam turbine assembly drives the generator to generate electricity.

2. The power generation system utilizing all waste heat of converter flue gas as claimed in claim 1, characterized in that: The primary waste heat recovery component also includes a first blower, the output end of which faces the interior of the furnace to provide air to the furnace.

3. The power generation system using full waste heat of converter flue gas as claimed in claim 1, characterized in that: The power generation system utilizing all waste heat of converter flue gas also includes a calorific value compensation component for maintaining the real-time calorific value stability of the converter flue gas in the furnace; The calorific value compensation component comprises: A gas tank filled with gas and connected to the furnace; A regulating valve, disposed between the gas holder and the furnace, for regulating the gas flow of the gas holder; A sensor for monitoring the heat value in the furnace and electrically connected to the regulating valve; and The gas burner is arranged at the bottom of the furnace and is used for burning the gas from the gas tank.

4. The power generation system utilizing all waste heat of converter flue gas as claimed in claim 3, characterized in that: The calorific value compensation component also includes a gas heater, which is arranged between the regulating valve and the furnace and is used to heat the gas from the gas tank.

5. The power generation system utilizing all waste heat of converter flue gas as claimed in claim 4, characterized in that: The power generation system for fully utilizing the waste heat of converter flue gas also includes a first dust collector, which is arranged between the first-level waste heat recovery component and the second-level waste heat recovery component to filter impurities in the boiler flue gas after combustion.

6. The power generation system utilizing all waste heat of converter flue gas as claimed in claim 4, characterized in that: The power generation system utilizing all waste heat of converter flue gas also includes a purification treatment component, which includes a denitrification device connected downstream of the economizer to remove nitrogen oxides in the boiler flue gas.

7. The power generation system utilizing all waste heat of converter flue gas as claimed in claim 6, characterized in that: The purification treatment component also includes: A second blower, connected to the outlet of the denitration device, for driving the boiler flue gas to move in a downstream direction; An air preheater, arranged at the air inlet of the second blower, for heating the incoming air; a second dust collector, disposed at the air outlet of the second blower, for filtering impurities in the boiler flue gas; and The induced draft fan is arranged downstream of the second dust collector and has the same wind direction as the second blower to assist the boiler flue gas to move downstream.

8. The power generation system utilizing all waste heat of converter flue gas as claimed in claim 7, characterized in that: The purification treatment component also includes: a desulfurization tower, arranged at the air outlet of the induced draft fan, for removing sulfur oxides in the boiler flue gas; and The chimney is arranged in a long shape and is connected to the desulfurization tower. The purified converter flue gas is discharged into the atmosphere from the chimney.

9. The power generation system utilizing all waste heat of converter flue gas as claimed in claim 1, characterized in that: The power generation assembly further includes a low-pressure heater, a deaerator, a feedwater pump, a high-pressure heater and a steam drum, which are arranged and connected in sequence after the condensate pump to form a passage for conveying water to the water-cooled wall in the furnace to heat and generate high-temperature steam; Wherein, the steam drum is connected to the steam turbine assembly.

10. The power generation system utilizing all waste heat of converter flue gas as claimed in claim 9, characterized in that: The power generation component also includes a condenser, which is arranged between the turbine component and the condensate pump and is used to recover and reuse high-temperature water vapor.

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