CN217585369U - High-efficient power generation system of electric stove steelmaking flue gas - Google Patents
High-efficient power generation system of electric stove steelmaking flue gas Download PDFInfo
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- CN217585369U CN217585369U CN202221129095.3U CN202221129095U CN217585369U CN 217585369 U CN217585369 U CN 217585369U CN 202221129095 U CN202221129095 U CN 202221129095U CN 217585369 U CN217585369 U CN 217585369U
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Abstract
The utility model relates to an electric stove steelmaking technical field, a high-efficient power generation system of electric stove steelmaking flue gas is proposed, including steelmaking electric stove, the combustion settling chamber, exhaust-heat boiler, steady voltage energy storage ware, flue gas processing system and power generation system, the combustion settling chamber includes the shell body, heat accumulator and over heater, the inside burning subsides the chamber that forms of shell body, the heat accumulator sets up in the burning subsides the intracavity, the over heater sets up in the heat accumulator, wherein, steelmaking electric stove, the combustion settling chamber, exhaust-heat boiler, flue gas processing system connects gradually, exhaust-heat boiler's steam output is connected to steady voltage energy storage ware's input, steady voltage energy storage ware's output is connected with over heater's input, over heater's output and power generation system are connected. Through the technical scheme, the problem that the flue gas waste heat cannot be recycled due to the periodically fluctuating characteristic of the flue gas in the electric furnace steelmaking process in the prior art is solved.
Description
Technical Field
The utility model relates to an electric stove steelmaking technical field, it is specific, relate to a high-efficient power generation system of electric stove steelmaking flue gas.
Background
With the development of national economy and the continuous improvement of the energy conservation and emission reduction requirements of steel production processes, the proportion of electric furnace steelmaking of various steel plants in China is continuously increased, and electric furnace steelmaking with short flow has the advantage of environmental protection compared with the traditional converter steelmaking with long flow, and is the future development direction. The flue gas flow, the temperature and the dust content of electric furnace steelmaking in the smelting process are constantly changed and show periodic fluctuation, and because of the characteristic of unstable high-temperature flue gas of electric furnace steelmaking, the high-temperature flue gas of an electric furnace steelmaking system in the prior art is cooled by a water-cooling sleeve and a mechanical air cooler, so that the purification treatment after the flue gas is cooled is ensured, the flue gas is discharged after reaching the standard, the waste heat is not fully utilized, and the flue gas is cooled by wasting electric power.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electric stove steelmaking flue gas high efficiency power generation system has solved the electric stove among the prior art steelmaking process because the periodic fluctuating characteristic of flue gas leads to the unable problem of recycling of flue gas waste heat.
The technical scheme of the utility model as follows:
the utility model provides an electric stove steelmaking flue gas high efficiency power generation system, includes steelmaking electric stove, burning deposit room, exhaust-heat boiler, steady voltage energy storage ware, flue gas processing system and power generation system, the burning deposit room includes shell body, heat accumulator and over heater, the inside burning that forms of shell body subsides the chamber, the heat accumulator sets up the intracavity is subsided in the burning, the over heater sets up in the heat accumulator, wherein, steelmaking electric stove, burning deposit room, exhaust-heat boiler, flue gas processing system connect gradually, the input of steady voltage energy storage ware is connected exhaust-heat boiler's steam output end, the output of steady voltage energy storage ware with the input of over heater is connected, the output of over heater with power generation system connects.
Further, the flue gas treatment system comprises a bag-type dust collector and a dust removal fan, the bag-type dust collector is connected with the waste heat boiler, the bag-type dust collector and the dust removal fan are sequentially connected, and a smoke exhaust chimney is connected to the tail end of the bag-type dust collector.
Further, the power generation system comprises a steam turbine and a generator, wherein the steam turbine is connected with the output end of the superheater, and the generator is connected with the steam turbine.
Further, still include moisturizing pipe, oxygen-eliminating device and feed pump, moisturizing union coupling the oxygen-eliminating device, the output of oxygen-eliminating device is equipped with the feed pump, the output of oxygen-eliminating device is connected the steady voltage energy storage ware with exhaust-heat boiler.
The cooling tower is connected with the condenser, and the cooling pump is arranged between the cooling tower and the condenser; the inlet end of the condenser is connected with the outlet end of the steam turbine, the outlet end of the condenser is connected with the deaerator, and a condensate pump is arranged between the condenser and the deaerator.
Further, the shell body is equipped with the intercommunication the flue gas entry and the exhanst gas outlet of chamber are subsided in the burning, the heat accumulator includes heat accumulator and middle heat accumulator all around, the heat accumulator is including setting up the inner wall of shell body just forms shell structure shell heat accumulator, middle heat accumulator sets up the intracavity is subsided in the burning, middle heat accumulator be located the flue gas by the flue gas entry arrives on the circulation route of exhanst gas outlet.
Further, the intermediate heat accumulator comprises a plurality of first heat accumulators and a plurality of second heat accumulators, the first heat accumulators are arranged side by side on a flow path of the flue gas from the flue gas inlet to the flue gas outlet, and the second heat accumulators are connected with the plurality of first heat accumulators; and a plurality of third heat accumulators are arranged on the shell heat accumulator and extend into the space between two adjacent first heat accumulators.
Further, the superheater comprises a heat exchange tube, the heat exchange tube passes through the first heat accumulator, the second heat accumulator, the third heat accumulator and the shell heat accumulator, and the inlet end and the outlet end of the heat exchange tube are both located on the outer side of the shell.
Further, the shell body comprises a structure wall body and a heat insulation layer, and the heat insulation layer is arranged on the inner side of the structure wall body.
Further, still be equipped with ignition head and air inlet on the shell body, the ignition head with air inlet all is located the flue gas entrance, the heat accumulator is located and is close to the flue gas entrance is equipped with the catalysis layer.
The utility model discloses a theory of operation and beneficial effect do:
the utility model discloses in, there is periodic fluctuation's problem to electric stove steelmaking output flue gas, improve the combustion settling chamber, subside the intracavity and set up the heat accumulator burning, the heat accumulator is the heat absorption when the flue gas temperature is high and is reduced the flue gas temperature, it improves the flue gas temperature to release heat when the flue gas temperature is low, balanced flue gas temperature, reduce the difference of high low temperature flue gas, carry out the samming to the flue gas, the steam pressure difference of height and the difference of high low temperature that make exhaust-heat boiler produce are littleer, more be favorable to exhaust-heat boiler work, and consequently also can reduce the requirement to the steady voltage energy storage ware, reduce the equipment investment. The combustion settling chamber is located the output of steelmaking electric stove, the heat accumulator can reach very high temperature, set up the over heater in the heat accumulator, the continuous saturated steam of steady voltage energy storage ware output enters into the over heater in, reheat through the heat accumulator, can further raise the temperature, utilize continuous superheated steam to generate electricity and improved about 68% to 90% for utilizing continuous saturated steam electricity generation generating capacity to the recovery volume to the waste heat is bigger, waste heat utilization is more abundant, resources are saved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a power generation system;
FIG. 2 is a schematic view of the structure of a combustion settling chamber;
in the figure: 1. the device comprises a steelmaking electric furnace, 2, a combustion settling chamber, 21, an outer shell, 211, a structural wall body, 212, a heat insulation layer, 213, a flue gas inlet, 214, a flue gas outlet, 215, an ignition head, 216, an air inlet, 22, a peripheral heat accumulator, 221, a shell heat accumulator, 222, a third heat accumulator, 23, an intermediate heat accumulator, 231, a first heat accumulator, 232, a second heat accumulator, 24, a dust cleaning maintenance door, 25, a catalyst layer, 26, a heat exchange pipe, 3, a waste heat boiler, 4, a voltage stabilizing energy accumulator, 5, a bag dust collector, 6, a dust removal fan, 7, a smoke exhaust chimney, 8, a steam turbine, 9, a generator, 10, a water supplementing pipe, 11, a deaerator, 12, a water feeding pump, 13, a cooling tower, 14, a condenser, 15, a cooling pump, 16 and a condensed water pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive work, are related to the scope of the present invention.
As shown in fig. 1 to 2, the present embodiment proposes
The utility model provides an electric stove steelmaking flue gas high efficiency power generation system, including steelmaking electric stove 1, burning settling chamber 2, exhaust-heat boiler 3, steady voltage energy storage ware 4, flue gas processing system and power generation system, burning settling chamber 2 includes shell body 21, heat accumulator and over heater, the inside burning that forms of shell body 21 subsides the chamber, the heat accumulator sets up in the burning subsides the intracavity, the over heater sets up in the heat accumulator, wherein, steelmaking electric stove 1, burning settling chamber 2, exhaust-heat boiler 3, flue gas processing system connects gradually, exhaust-heat boiler 3's steam output end is connected to steady voltage energy storage ware 4's input, steady voltage energy storage ware 4's output is connected with the input of over heater, the output and the power generation headtotail of over heater.
The flue gas of the periodic fluctuation of electric stove output enters the exhaust-heat boiler 3 after passing through the combustion settling chamber 2, the flue gas discharges after passing through the flue gas processing system after releasing heat in the exhaust-heat boiler 3, and the exhaust-heat boiler 3 can output the saturated discontinuous steam of about 1.5-1.8Mpa, 240-280 duC, the saturated discontinuous steam enters the steady voltage energy accumulator 4 and then outputs the continuous saturated steam of 1.0Mpa, 180 duC, the continuous saturated steam enters the superheater again to heat, output the continuous superheated steam of 1.0Mpa, 250 duC, the continuous superheated steam is used for generating electricity of the generating system.
In this embodiment, there is periodic fluctuation's problem to electric stove steelmaking output flue gas, improve combustion settling chamber 2, set up the heat accumulator at the combustion settling chamber, the heat accumulator absorbs the heat when the flue gas temperature is high and reduces the flue gas temperature, it improves the flue gas temperature to release heat when the flue gas temperature is low, balanced flue gas temperature, reduce the difference of high low temperature flue gas, carry out the samming to the flue gas, the steam pressure difference of height and the difference of high low temperature that make exhaust-heat boiler 3 produce are littleer, more be favorable to exhaust-heat boiler 3 work, and consequently also can reduce the requirement to steady voltage energy storage ware 4, reduce the equipment investment. The combustion settling chamber 2 is positioned at the output end of the steelmaking electric furnace 1, the heat accumulator can reach a very high temperature, a superheater is arranged in the heat accumulator, continuous saturated steam output by the voltage-stabilizing energy accumulator 4 enters the superheater, reheating is performed through the heat accumulator, the temperature can be further increased, power generation is performed by utilizing the continuous superheated steam, the power generation capacity is improved by about 68% to 90% relative to the power generation capacity by utilizing the continuous saturated steam, the recovery amount of waste heat is larger, the waste heat is more fully utilized, and resources are saved.
The flue gas treatment system comprises a bag-type dust collector 5 and a dust removal fan 6, wherein the bag-type dust collector 5 is connected with the waste heat boiler 3, the bag-type dust collector 5 and the dust removal fan 6 are sequentially connected, and the tail end of the bag-type dust collector is connected with a smoke exhaust chimney 7. The high-temperature flue gas enters the bag-type dust collector 5 after being released heat by the waste heat boiler 3, is subjected to dust collection by the bag-type dust collector 5 and is output to the smoke exhaust chimney 7 by the dust collection fan 6 to be discharged outwards.
The power generation system comprises a steam turbine 8 and a generator 9, wherein the steam turbine 8 is connected with the output end of the superheater, and the generator 9 is connected with the steam turbine 8. And continuously superheated steam enters the steam turbine 8 to drive the generator 9 to generate electricity, and the generator 9 sends out the electricity after the electricity generation is finished.
Still include moisturizing pipe 10, oxygen-eliminating device 11 and water-feeding pump 12, moisturizing pipe 10 connects oxygen-eliminating device 11, and the output of oxygen-eliminating device 11 is equipped with water-feeding pump 12, and voltage stabilizing energy storage ware 4 and exhaust-heat boiler 3 are connected to the output of oxygen-eliminating device 11. The water supplementing pipe 10 supplies water to the deaerator 11, oxygen and other dissolved in water are removed through the deaerator 11, then the water is output in two ways, one way is input into the waste heat boiler 3 and used for generating discontinuous saturated steam, and the other way is input into the pressure stabilizing energy accumulator 4 and used for supplementing water and producing the continuous saturated steam from the discontinuous saturated steam.
The cooling tower 13 is connected with the condenser 14, and the cooling pump 15 is arranged between the cooling tower 13 and the condenser 14; the inlet end of the condenser 14 is connected with the outlet end of the steam turbine 8, the outlet end of the condenser 14 is connected with the deaerator 11, and a condensate pump 16 is arranged between the condenser 14 and the deaerator 11. Waste steam discharged by the steam turbine 8 enters the condenser 14, is cooled and then enters the deaerator 11 for water replenishing, so that water recycling is realized, water resource use is reduced, and resources are saved.
The shell body 21 of the combustion settling chamber 2 is provided with a flue gas inlet 213 and a flue gas outlet 214 which are communicated with the combustion settling chamber, the heat accumulator comprises a heat accumulator 22 and an intermediate heat accumulator 23 all around, the heat accumulator 22 all around comprises an inner wall arranged on the shell body 21 and forms a shell heat accumulator 221, the intermediate heat accumulator 23 is arranged in the combustion settling chamber, and the intermediate heat accumulator 23 is positioned on a flow path from the flue gas inlet 213 to the flue gas outlet 214.
Increase heat accumulator 22 all around on the shell body 21 inner wall of combustion settling chamber 2, in heat accumulator 22 all around by a block heat accumulator attached to set up and form shell heat accumulator 221 on shell body 21 inner wall, set up middle heat accumulator 23 in the outer combustion settling chamber, middle heat accumulator 23 sets up on the flue gas is by the indispensable route of flue gas entry 213 to exhanst gas outlet 214, namely the flue gas gets into and from exhanst gas outlet 214 on the indispensable route of exhanst gas, through shell heat accumulator 221 who sets up on shell body 21 and the middle heat accumulator 23 that sets up in the combustion settling chamber inside, can enough make the heat accumulator fully absorb the flue gas heat, provide sufficient heating energy for continuous saturated steam, can maintain the inside temperature stability of combustion settling chamber better again, guarantee that combustion settling chamber 2 gets into the flue gas height low temperature difference of exhaust-heat boiler 3 low.
The intermediate heat accumulator 23 includes a plurality of first heat accumulators 231 and a plurality of second heat accumulators 232, the plurality of first heat accumulators 231 are arranged side by side on a flow path of the flue gas from the flue gas inlet 213 to the flue gas outlet 214, and the plurality of first heat accumulators 231 are connected to the second heat accumulators 232; the shell heat accumulator 221 is provided with a plurality of third heat accumulators 222, and the third heat accumulators 222 extend between two adjacent first heat accumulators 231.
In this embodiment, in the combustion settling chamber, a plurality of first heat accumulators 231 are arranged between the flue gas inlet 213 and the flue gas outlet 214 side by side, the middle of each of the plurality of first heat accumulators 231 is provided with a second heat accumulator 232 which divides the space into two parts, the third heat accumulator 222 is arranged on the shell heat accumulator 221 and is arranged in parallel with the first heat accumulators 231, and a third transverse heat accumulator is arranged between any two adjacent first heat accumulators 231 and extends into the middle, and the spaces on both sides of the second heat accumulator 232 are arranged, so that the first heat accumulator 231, the second heat accumulator 232, the third heat accumulator 222 and the shell heat accumulator 221 form two curved flue gas flow channels, the flue gas enters from the flue gas inlet 213 and is discharged from the flue gas outlet 214 through the two flue gas flow channels, so as to ensure smooth circulation of the flue gas from the flue gas inlet 213 to the flue gas outlet 214, and also prolong the flue gas residence time and the contact area of the flue gas and the heat accumulators, so that the heat accumulators fully absorb or release heat, improve the utilization of the waste heat of the high-temperature and the heating effect on the low-temperature flue gas, and prolong the sufficient carbon monoxide retention time of the flue gas.
The superheater comprises a heat exchange pipe 26, the heat exchange pipe 26 passes through the first heat accumulator 231, the second heat accumulator 232, the third heat accumulator 222 and the shell heat accumulator 221, and the inlet end and the outlet end of the heat exchange pipe 26 are both positioned outside the outer shell 21. The heat accumulator is fully utilized, the length of the heat exchange tube 26 in the combustion settling chamber is increased, the heat exchange time of continuous saturated steam is prolonged, the heat exchange effect is improved, and the temperature of output continuous superheated steam is ensured.
The outer shell 21 includes a structural wall 211 and an insulation layer 212, and the insulation layer 212 is disposed inside the structural wall 211. Through the thermal-insulated effect of heat preservation 212 like this, make the more of heat in the combustion settling chamber 2 remain inside, the samming effect of flue gas is better, makes the heat accumulator accumulate more heat simultaneously, realizes the make full use of electric stove steelmaking waste heat.
An ignition head 215 and an air inlet 216 are further arranged on the outer shell 21, the ignition head 215 and the air inlet 216 are both located at the flue gas inlet 213, and a catalytic layer 25 is arranged on the heat accumulator close to the flue gas inlet 213. An ignition head 215 and an air inlet 216 are added at a flue gas inlet 213 of the combustion settling chamber 2, when the content of carbon monoxide in the flue gas is higher and the content of oxygen is lower, a valve at the air inlet 216 is opened to enable part of air to enter the combustion settling chamber, air is supplemented for the combustion settling chamber, and the carbon monoxide in the flue gas is combusted secondarily; when the contents of carbon monoxide and oxygen in the flue gas are both higher, and the carbon monoxide can not be combusted secondarily due to lower temperature of the flue gas, the ignition head 215 is started to assist the carbon monoxide in the flue gas to be combusted secondarily; when the flue gas temperature is lower, the carbon monoxide content is higher and the oxygen content is lower, the air inlet 216 and the ignition head 215 can be opened simultaneously to promote the secondary combustion of the carbon monoxide. Through setting up ignition head 215 and air inlet 216, open air inlet 216 or open ignition head 215 according to actual need to set up catalysis layer 25 and promote the carbon monoxide secondary combustion in the flue gas, can promote carbon monoxide to burn out, guarantee safety and avoid discharging carbon monoxide to the air simultaneously, carbon monoxide secondary combustion can further improve the burning and subsides intracavity temperature simultaneously, provides the heat source for the heat accumulator.
The outer shell 21 is also provided with an ash cleaning maintenance door 24 for entering the combustion settling chamber for ash cleaning maintenance work.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an electric stove steelmaking flue gas high efficiency power generation system, its characterized in that, includes steelmaking electric stove (1), burning deposit room (2), exhaust-heat boiler (3), steady voltage energy storage ware (4), flue gas processing system and power generation system, burning deposit room (2) include shell body (21), heat accumulator and over heater, the inside burning subsides the chamber that forms of shell body (21), the heat accumulator sets up in the burning subsides the intracavity, the over heater sets up in the heat accumulator, wherein, steelmaking electric stove (1), burning deposit room (2), exhaust-heat boiler (3), flue gas processing system connect gradually, the input of steady voltage energy storage ware (4) is connected the steam output end of exhaust-heat boiler (3), the output of steady voltage energy storage ware (4) with the input of over heater is connected, the output of over heater with power generation system connects.
2. The electric steelmaking flue gas efficient power generation system according to claim 1, characterized in that the flue gas treatment system comprises a bag-type dust collector (5) and a dust removal fan (6), the bag-type dust collector (5) is connected with the exhaust-heat boiler (3), the bag-type dust collector (5) and the dust removal fan (6) are connected in sequence, and the tail end of the bag-type dust collector is connected with a smoke exhaust chimney (7).
3. The electric furnace steelmaking flue gas high efficiency power generation system according to claim 1, characterized in that the power generation system comprises a steam turbine (8) and a generator (9), the steam turbine (8) is connected with the output end of the superheater, and the generator (9) is connected with the steam turbine (8).
4. The electric furnace steelmaking flue gas high-efficiency power generation system according to claim 3, further comprising a water supplementing pipe (10), a deaerator (11) and a water feeding pump (12), wherein the water supplementing pipe (10) is connected with the deaerator (11), the water feeding pump (12) is arranged at the output end of the deaerator (11), and the output end of the deaerator (11) is connected with the voltage-stabilizing energy accumulator (4) and the waste heat boiler (3).
5. The electric furnace steelmaking flue gas high-efficiency power generation system according to claim 4, further comprising a cooling tower (13), a condenser (14), a cooling pump (15) and a condensate pump (16), wherein the cooling tower (13) is connected with the condenser (14), and the cooling pump (15) is arranged between the cooling tower (13) and the condenser (14); the entrance point of condenser (14) with the exit end of steam turbine (8) is connected, the exit end of condenser (14) with oxygen-eliminating device (11) are connected, condenser (14) with be equipped with condensate pump (16) between oxygen-eliminating device (11).
6. The electric steelmaking flue gas high efficiency power generation system according to claim 1, wherein the outer shell (21) is provided with a flue gas inlet (213) and a flue gas outlet (214) which are communicated with the combustion settling chamber, the heat accumulator comprises a peripheral heat accumulator (22) and an intermediate heat accumulator (23), the peripheral heat accumulator (22) comprises a shell heat accumulator (221) which is arranged on the inner wall of the outer shell (21) and forms a shell structure, the intermediate heat accumulator (23) is arranged in the combustion settling chamber, and the intermediate heat accumulator (23) is positioned on the flow path of flue gas from the flue gas inlet (213) to the flue gas outlet (214).
7. The electric steelmaking flue gas high efficiency power generation system according to claim 6, wherein said intermediate heat accumulator (23) comprises a plurality of first heat accumulators (231) and a plurality of second heat accumulators (232), said plurality of first heat accumulators (231) being arranged side by side in a flow path of flue gas from said flue gas inlet (213) to said flue gas outlet (214), said second heat accumulator (232) being connected to said plurality of first heat accumulators (231); and a plurality of third heat accumulators (222) are arranged on the shell heat accumulator (221), and the third heat accumulators (222) extend into the space between two adjacent first heat accumulators (231).
8. The electric steelmaking flue gas high efficiency power generation system as claimed in claim 7, wherein said superheater includes heat exchange tubes (26), said heat exchange tubes (26) run inside said first heat accumulator (231), second heat accumulator (232), third heat accumulator (222) and shell heat accumulator (221), and inlet and outlet ends of said heat exchange tubes (26) are located outside said outer shell (21).
9. The electric steelmaking flue gas efficient power generation system as claimed in claim 1, wherein the outer shell (21) comprises a structural wall (211) and an insulating layer (212), the insulating layer (212) being disposed inside the structural wall (211).
10. The electric steelmaking flue gas efficient power generation system as claimed in claim 6, wherein an ignition head (215) and an air inlet (216) are further provided on the outer shell (21), the ignition head (215) and the air inlet (216) are both located at the flue gas inlet (213), and the heat accumulator is provided with a catalytic layer (25) located near the flue gas inlet (213).
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| CN202221129095.3U CN217585369U (en) | 2022-05-11 | 2022-05-11 | High-efficient power generation system of electric stove steelmaking flue gas |
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| CN202221129095.3U CN217585369U (en) | 2022-05-11 | 2022-05-11 | High-efficient power generation system of electric stove steelmaking flue gas |
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