CN109811369A - A kind of aluminum cell smoke residual heat reclaiming - Google Patents

A kind of aluminum cell smoke residual heat reclaiming Download PDF

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Publication number
CN109811369A
CN109811369A CN201910157439.8A CN201910157439A CN109811369A CN 109811369 A CN109811369 A CN 109811369A CN 201910157439 A CN201910157439 A CN 201910157439A CN 109811369 A CN109811369 A CN 109811369A
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China
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pressure
water
flue gas
heat
low
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唐豪杰
王为民
赵庆
陶舒畅
王毅
万志伟
陶志强
吴家桦
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Dongfang Electric Corp
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Dongfang Electric Corp
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Abstract

The invention discloses a kind of aluminum cell smoke residual heat reclaimings, including aluminium cell, heat exchange equipment, Smoke Gas Purity by Electrolysis equipment, electrolysis flue gas air-introduced machine and chimney;According to the trend of flue gas, the high-temperature flue gas of aluminium cell enters heat exchange equipment through smoke discharging pipe, and electrolysis flue gas exchanges heat in heat exchange equipment, and the electrolysis flue gas after heat exchange enters Smoke Gas Purity by Electrolysis equipment, the removing for carrying out dust and pollutant, is most discharged into ambient air through chimney afterwards;The water supply of the heat exchange equipment access coal generating system exchanges heat with electrolysis flue gas.The present invention is in the case where being only equipped with heat exchange equipment, by aluminium cell fume afterheat and the coupling for providing coal generating system for oneself, make full use of the feature that coal generating system is high-efficient, effectively solve the problems, such as that electrolytic cell fume afterheat quality is low, utmostly improve residual heat generating efficiency, the heating pumping from steam turbine can be effectively reduced, unit output is improved or reduces coal feeding amount, energy consumption is effectively reduced.

Description

A kind of aluminum cell smoke residual heat reclaiming
Technical field
The present invention relates to the fume treatment technology of electrolytic aluminium factory, specifically a kind of aluminum cell smoke residual heat reclaimings.
Background technique
Electrolytic aluminium factory is big power consumer, and aluminum electrolysis technology uses high current, low-voltage, consumes a large amount of electric energy.Electrolytic aluminium The electric energy of input really is accounted for only less than 50% for the energy of cell reaction in the electric energy of factory's consumption, and most of energy is with thermal energy Form by flue gas, slot shell radiate etc. modes lose, the heat that wherein flue gas is taken away accounts for about 30%.Using reasonable section Energy modification scheme, recycles this partial fume waste heat of electrolyzer outlet, for aluminum electrolysis industry energy-saving and emission-reduction, improves economical Benefit is significant.
Electrolytic cell generate flue gas by be drawn blower extraction, maintain electrolytic cell in negative pressure state, avoid harmful substance to Environmental diffusion.Electrolysis process demand is often only considered during existing design of electrolysis cells, does not consider the need of flue gas waste heat recovery It asks.Often there is place of much leaking out in electrolytic cell housing, a large amount of cold airs in environment are discharged after entering electrolytic cell with flue gas, Cause electrolytic cell exhaust heat quality lower, only 150 DEG C or so, which has limited waste heats to recycle feasible technological approaches.It is existing remaining Recuperation of heat scheme is mostly to heat cold water by a heat exchanger, meets the needs of domestic hot-water.Simultaneously by electrolysis procedure work There is replacement anode in the process, go out the links such as aluminium in the influence of skill, Aluminum Electrolysis Production, flue-gas temperature and air quantity fluctuation are larger, this It is utilized to electrolytic cell fume afterheat and brings difficulty.
Electrolytic aluminium factory is often built and provides coal fired power plant for oneself.Coal fired power plant is provided for oneself equipped with boiler system, it is high to generate high temperature Press vapor.Therefore, if traditional electrolytic aluminium factory and the equipment for providing coal fired power plant for oneself can be transformed, using providing fire coal for oneself The thermal energy in power station is simultaneously translated into electric energy, also while can satisfy the Process heat demand in aluminum oxide production process, then It just can effectively solve the technological deficiency that aluminium cell fume afterheat quality is low, recovery efficiency is not high existing for existing electrolytic aluminium factory, This is also the present imperative design improvement direction in the field.
Summary of the invention
The purpose of the present invention is provide for the technical problem that aluminium cell fume afterheat quality is low, recovery efficiency is not high A kind of aluminum cell smoke residual heat reclaiming.For being equipped with the newly-built or existing electrolytic aluminium factory of private station, pass through conjunction The conceptual design or systems technology of reason are transformed, and establish aluminium cell flue gas waste heat recovery and provide the coupling of coal generating system for oneself Relationship, high by coal generating system heat source quality, the high advantage of generating efficiency realizes the high efficiente callback of electrolytic cell low grade residual heat It utilizes, reduces private station coal feeding amount, realize the target of energy-saving and emission-reduction.
Technical scheme is as follows:
A kind of aluminum cell smoke residual heat reclaiming, it is characterised in that: net including aluminium cell, heat exchange equipment, electrolysis flue gas Change equipment, electrolysis flue gas air-introduced machine and chimney;According to the trend of flue gas, connection relationship successively are as follows: the high temperature of aluminium cell Flue gas enters heat exchange equipment through smoke discharging pipe, and electrolysis flue gas exchanges heat in heat exchange equipment, and the electrolysis flue gas after heat exchange enters Smoke Gas Purity by Electrolysis equipment carries out the removing of dust and pollutant, is most discharged into ambient air through chimney afterwards;The heat exchange equipment Access water supply or the condensed water of coal generating system.
The aluminium cell can be single aluminium cell, be also possible to the electrolytic cell that multiple aluminium cells compose in parallel Group.
The coal generating system may include coal-burning boiler, steam turbine high-pressure cylinder, turbine low pressure cylinder, generator, coagulate Vapour device, condensate pump, low-pressure heater, oxygen-eliminating device, feed pump, high-pressure heater etc..The above equipment passes through water and vapor pipe Road connects into an entirety, realizes a complete Rankine cycle system.Therefore, for the Rankine cycle system, the water supply The water supply that can be feed pump is also possible to the condensed water of condensate pump.
The coal generating system includes various types, can be various subcritical coal generating systems, overcritical fire coal Generating set and ultra-supercritical coal-fired power generating units;It can be the coal generating system without reheating, single reheat power generation system System and double reheat electricity generation system etc..
There are two types of electrolysis flue gas residual neat recovering systems and the mode of coal generating system boiler circuit coupling:
(1) when the high-temperature flue gas of aluminium cell passes through electrolysis flue gas heat exchanger and water supply or condensation water direct heat-exchange, coal fired power generation The specific coupled modes of system and aluminum cell smoke residual heat reclaiming are as follows:
The condensed water of the condensate pump outlet of coal generating system is divided into two-way, enters low-pressure heater all the way, and another way enters Electrolysis flue gas heat exchanger, two-way are respectively arranged with condensation water regulating valve and low pressure waste heat condensation water regulating valve.According to aluminium cell Temperature, the size of flow of exiting flue gas, are calculated the condensing capacity to match with electrolysis flue gas waste heat energy and quality, adjust The aperture of whole condensation water regulating valve and low pressure waste heat condensation water regulating valve requires so that meeting condensed water distribution, and control enters low Press the water of heater and electrolysis flue gas heat exchanger.It is provided on extraction line between turbine low pressure cylinder and low-pressure heater Low-pressure pumping steam valve is adjusted the aperture of low-pressure pumping steam valve, is controlled the pumping of low pressure (LP) cylinder based on the condensing water flow for entering low-pressure heater Vapour amount.Residual heat of aluminum reduction cell quality is higher, heat is enough, electrolysis flue gas waste heat can satisfy heat-setting water to optimal design In the case where the requirement of temperature, condensation water regulating valve and low-pressure pumping steam valve can be completely closed, low pressure (LP) cylinder steam extraction is cut off at this time and adds Heat, completely by electrolysis flue gas heat-setting water.The condensed water come out from electrolysis flue gas heat exchanger finally injects oxygen-eliminating device.
The water supply come out from feed pump is divided into two-way, enters high-pressure heater all the way, and another way enters electrolysis flue gas and changes Hot device, two-way are respectively arranged with feed-regulating valve and high pressure waste heat feed-regulating valve.According to the temperature of aluminium cell flue gas, flow Etc. parameters size, be calculated the confluent to match with electrolysis flue gas waste heat energy and quality, adjustment feed-regulating valve and The aperture of high pressure waste heat feed-regulating valve, control enter the water of high-pressure heater and electrolysis flue gas heat exchanger, give so that meeting Water operation requirement.Be provided with high pressure extraction valve on extraction line between steam turbine high-pressure cylinder and high-pressure heater, based on into The feedwater flow for entering electrolysis flue gas heat exchanger adjusts the aperture of high pressure extraction valve, controls the steam extraction amount of high pressure cylinder.It is operating normally In the case of, feed-regulating valve is turned down, high pressure waste heat feed-regulating valve is opened, is reduced from the steam extraction in steam turbine high-pressure cylinder.In aluminium In the case that electrolytic cell flue gas waste heat recovery system or electrolysis flue gas heat exchanger break down, feed-regulating valve is opened, is closed high The hot feed-regulating valve of discard increases from the steam extraction in steam turbine high-pressure cylinder, guarantees system generated output and efficiency.
Based on above content, the principle that the present invention realizes that fume afterheat utilizes is: by electrolysis flue gas heat exchanger, will be electrolysed The waste heat classification of flue gas passes to condensed water and water supply, reduces the steam extracted from turbine low pressure cylinder and steam turbine high-pressure cylinder Amount.In this way in the case where coal feeding amount is constant, generated output can be increased;Or in the case where guaranteeing that generated output is constant, Reduce coal feeding amount.The system is provided with multiple valves, can be the case where the parameters such as temperature of electrolysis flue gas, flow change Under, the switching and adjustment of the method for operation are carried out, guarantees that entire electricity generation system efficiently and reliably works.
(2) when the high-temperature flue gas of aluminium cell passes through electrolysis flue gas heat exchanger and water supply or condensed water indirect heat exchange, fire coal The specific coupled modes of electricity generation system and aluminum cell smoke residual heat reclaiming are as follows:
The condensed water of condensate pump outlet is divided into two-way, enters low-pressure heater all the way, and another way enters low temperature water heater, and two Road is respectively arranged with condensation water regulating valve and low pressure waste heat condensation water regulating valve.According to the temperature of aluminium cell flue gas, flow etc. The condensing capacity to match with electrolysis flue gas waste heat energy and quality, adjustment condensation water regulating valve is calculated in the difference of parameter With the aperture of low pressure waste heat condensation water regulating valve, it is adjusted into the water of low-pressure heater and low temperature water heater, so that meeting Condensed water distribution requires.It is provided with low-pressure pumping steam valve on extraction line between turbine low pressure cylinder and low-pressure heater, is based on Into the condensing water flow of low-pressure heater, the confluent to match with electrolysis flue gas waste heat energy and quality is calculated, adjusts The aperture of whole low-pressure pumping steam valve, controls the steam extraction amount of low pressure (LP) cylinder, requires so that meeting condensed water distribution.In residual heat of aluminum reduction cell product Matter is higher, heat is enough, electrolysis flue gas waste heat can satisfy heat-setting water to optimal design temperature requirement in the case where, can To completely close condensation water regulating valve and low-pressure pumping steam valve, low pressure (LP) cylinder steam extraction heating is cut off at this time, is heated completely by electrolysis flue gas Condensed water.The condensed water come out from low temperature water heater finally injects oxygen-eliminating device.
The water supply come out from feed pump is divided into two-way, enters high-pressure heater all the way, and another way enters high-temperature water heating Device, two-way are respectively arranged with feed-regulating valve and high pressure waste heat feed-regulating valve.According to the temperature of aluminium cell flue gas, flow etc. The confluent to match with electrolysis flue gas waste heat energy and quality is calculated in the size of parameter, adjusts feed-regulating valve and height The aperture of the hot feed-regulating valve of discard, adjusts the aperture of feed-regulating valve and high pressure waste heat feed-regulating valve, and control enters low pressure The water of heater and high temperature water heater requires so that meeting confluent distribution.Steam turbine high-pressure cylinder and high-pressure heater it Between extraction line on be provided with high pressure extraction valve, based on enter electrolysis flue gas heat exchanger feedwater flow, adjust high pressure extraction The aperture of valve controls the steam extraction amount of high pressure cylinder.Under normal operating conditions, condensation water regulating valve is closed, high pressure waste heat is opened and gives Water regulating valve is reduced from the steam extraction in steam turbine high-pressure cylinder.In aluminum cell smoke residual heat reclaiming or high temperature water heater In the case where failure, condensation water regulating valve is opened, high pressure waste heat feed-regulating valve is closed, is increased out of steam turbine high-pressure cylinder Steam extraction, guarantee system generated output and efficiency.
The high-temperature flue gas that aluminium cell comes out enters waste heat boiler, and aquatic products unboiled water steam is heated in waste heat boiler, generates Vapor a part can be used as steam pumping, for industrial heat or life heat, a part enter high temperature water heater heating Water supply, is condensed into hydrophobic in high temperature water heater, and enters water at low temperature heater, is converged after heat-setting water with steam extraction return water It closes, reenters waste heat boiler after the pressurization of waste heat circulation water pump.
Based on above content, the principle that the present invention realizes that fume afterheat utilizes is: aluminium cell fume high-temperature waste heat passes through Heat flow is passed to waste heat circulation water and forms high-temperature steam by waste heat boiler, and high-temperature steam a part can be used as industry and life With the source of steam, another part by high temperature water heater and low temperature water heater, transfer heat to respectively condensed water and Water supply reduces the quantity of steam extracted from turbine low pressure cylinder and steam turbine high-pressure cylinder, in this way in the case where coal feeding amount is constant, Generated output can be increased;Or in the case where guaranteeing that generated output is constant, coal feeding amount is reduced, to realize energy-efficient mesh 's.The system is provided with multiple valves, in the case where the parameters such as temperature of electrolysis flue gas, flow change, it is adjustable and Switchover operation mode guarantees that entire electricity generation system efficiently and reliably works.
Beneficial effects of the present invention are as follows:
(1) present invention can realize the coupling that aluminium cell fume afterheat utilized and provided for oneself coal generating system well;By The equipment such as electrolysis flue gas heat exchanger or waste heat boiler, by electrolysis flue gas waste heat pass to condensed water in coal generating system and to Water can effectively reduce the heating pumping from steam turbine, improve unit output or reduce coal feeding amount, energy consumption is effectively reduced.
(2) present invention comprehensively considers running various situations, devises multiple valves, it is independent that coal fired power plant may be implemented Operation, residual heat of aluminum reduction cell utilize the switching that the methods of operation such as operation are coupled with coal generating system, guarantee system reliably, efficiently Operation.
(3) present invention utilizes electrolysis flue gas waste heat, can not only heat water supply and condensed water, can also meet industrial in factory Steam and the life demand of steam, utmostly improve the comprehensive utilization effect of waste heat.
(4) present invention utilizes thermoelectricity to turn by the coupling of realization aluminium cell flue gas waste heat recovery and coal generating system Change high-efficient coal generating system, recycle the waste heat of electrolytic cell flue gas product low-quality, and be converted to electric energy, utmostly improves Utilization rate of waste heat.
(5) the fume afterheat Utilization plan in the present invention turns fume afterheat in the case where being only equipped with heat exchange equipment Changing electric energy into, the system reform is simple, and it is reliable for operation, it is effectively saved equipment investment.
Detailed description of the invention
Fig. 1 is the aluminum cell smoke residual heat reclaiming schematic diagram of the embodiment of the present invention 1.
Fig. 2 is the aluminum cell smoke residual heat reclaiming schematic diagram of the embodiment of the present invention 2.
Fig. 3 is the aluminum cell smoke residual heat reclaiming schematic diagram of the embodiment of the present invention 2.
Wherein, appended drawing reference are as follows: 1 coal-burning boiler, 2 steam turbine high-pressure cylinders, 3 turbine low pressure cylinders, 4 generators, 5 condensings Device, 6 condensate pumps, 7 low-pressure heaters, 8 oxygen-eliminating devices, 9 feed pumps, 10 high-pressure heaters, 11 aluminium cells, 12 electrolysis flue gas are changed Hot device, 13 Smoke Gas Purity by Electrolysis equipment, 14 electrolysis flue gas air-introduced machines, 15 chimneys, 16 high pressure extraction valves, 17 low-pressure pumping steam valves, 18 Feed-regulating valve, 19 condensation water regulating valves, 20 high pressure waste heat feed-regulating valves, 21 low pressure waste heats condense water regulating valve, 22 waste heats Water circulating pump, 23 high temperature water heaters, 24 low temperature water heaters, 25 electrolysis flue gas general pipeline, 26 waste heat boilers, 27 steam pumpings, 28 Steam extraction return water, 29 Steam Turbine Through IP Admissions, 30 No.1 high-pressure heaters, 31 No. two high-pressure heaters, 32 No.1 low-pressure heaters, 33 No. two low-pressure heaters.
Specific embodiment
Embodiment 1
As shown in Figure 1, a kind of aluminum cell smoke residual heat reclaiming, including aluminium cell 11, electrolysis flue gas heat exchanger 12, electricity Solve flue gas purifying equipment 13, electrolysis flue gas air-introduced machine 14 and chimney 15;According to the trend of flue gas, connection relationship successively are as follows: The high-temperature flue gas of aluminium cell 11 enters electrolysis flue gas heat exchanger 12 through smoke discharging pipe, and electrolysis flue gas is in electrolysis flue gas heat exchanger 12 It inside exchanges heat, the electrolysis flue gas after heat exchange enters Smoke Gas Purity by Electrolysis equipment 13, carries out the removing of dust and pollutant, most Ambient air is discharged by chimney 15.The aluminium cell 11 can be single aluminium cell, be also possible to multiple aluminium cells The electrolytic cell group composed in parallel.
Coal generating system in Fig. 1, including coal-burning boiler 1, steam turbine high-pressure cylinder 2, turbine low pressure cylinder 3, generator 4, condenser 5, condensate pump 6, low-pressure heater 7, oxygen-eliminating device 8, feed pump 9, high-pressure heater 10 etc..The above equipment passes through water And vapor pipeline connects into an entirety, realizes a complete Rankine cycle system.Its course of work is as follows: fire coal is thrown Enter the vapor that 1 combustion heating water supply of coal-burning boiler generates high temperature and pressure, this process converts water for coal-fired chemical energy and steams The thermal energy of gas.High-temperature high-pressure steam initially enters steam turbine high-pressure cylinder 2 and carries out expansion work, and the steam for finishing function enters steamer The further expansion work of machine low pressure (LP) cylinder 3.The steam come out from turbine low pressure cylinder 3 enters condenser 5, carries out heat release and becomes to condense Water.Condensed water enters low-pressure heater 7 after condensate pump 6, and exchanges heat from the steam that turbine low pressure cylinder 3 extracts, Enter oxygen-eliminating device 8 later.Condensed water into oxygen-eliminating device 8 carries out mixing deoxygenation with the steam extracted from steam turbine high-pressure cylinder 2 Afterwards, it is boosted by feed pump 9.The water supply that feed pump 9 comes out enters high-pressure heater 10, and extracts from steam turbine high-pressure cylinder 2 After steam is exchanged heat, reenters coal-burning boiler 1 and heated.The steam extracted from steam turbine high-pressure cylinder 2 adds by high pressure Become high pressure draining after the heat exchange of hot device 10 is cooling and enter oxygen-eliminating device 8, the steam extracted from turbine low pressure cylinder 3, by low pressure plus It is hydrophobic to become low pressure after the hot heat exchange of device 7 is cooling, into condenser 5.
For the Rankine cycle system, the coupled modes of coal generating system and aluminum cell smoke residual heat reclaiming Are as follows: the condensed water that the condensate pump 6 of coal generating system exports is divided into two-way, enters low-pressure heater 7 all the way, and another way enters Electrolysis flue gas heat exchanger 12, two-way are respectively arranged with condensation water regulating valve 19 and low pressure waste heat condensation water regulating valve 21.According to aluminium The difference of the parameters such as temperature, the flow of 11 exiting flue gas of electrolytic cell, adjustment condensation water regulating valve 19 and low pressure waste heat condensed water tune The aperture of valve 21 is saved, control enters the water of low-pressure heater 7 and electrolysis flue gas heat exchanger 12.Turbine low pressure cylinder 3 and low pressure It is provided with low-pressure pumping steam valve 17 on extraction line between heater 7, based on the condensing water flow for entering low-pressure heater 7, adjusts The aperture of whole low-pressure pumping steam valve 17 controls the steam extraction amount of low pressure (LP) cylinder.11 slot waste heat quality of aluminium electroloysis is higher, the enough feelings of heat Under condition, condensation water regulating valve 19 and low-pressure pumping steam valve 17 can be completely closed.The condensation come out from electrolysis flue gas heat exchanger 12 Water finally injects oxygen-eliminating device 8.
The water supply come out from feed pump 9 is divided into two-way, enters high-pressure heater 10 all the way, another way enters electrolysis flue gas Heat exchanger 12, two-way are respectively arranged with feed-regulating valve 18 and waste heat feed-regulating valve 20.According to the temperature of 11 flue gas of aluminium cell The difference of the parameters such as degree, flow, adjusts the aperture of feed-regulating valve 18 and high pressure waste heat feed-regulating valve 20, and control enters high pressure The water of heater 10 and electrolysis flue gas heat exchanger 12.On extraction line between steam turbine high-pressure cylinder 2 and high-pressure heater 10 It is provided with high pressure extraction valve 16, based on the feedwater flow for entering electrolysis flue gas heat exchanger 12, adjusts the aperture of high pressure extraction valve 16, Control the steam extraction amount of high pressure cylinder.Under normal operating conditions, feed-regulating valve 18 is closed, high pressure waste heat feed-regulating valve is opened 20, it reduces from the steam extraction in steam turbine high-pressure cylinder 2.Go out in aluminum cell smoke residual heat reclaiming or electrolysis flue gas heat exchanger 12 In the case where existing failure, feed-regulating valve 18 is opened, closes high pressure waste heat feed-regulating valve 20, is increased from steam turbine high-pressure cylinder 2 Interior steam extraction guarantees system generated output and efficiency.
Based on above content, the principle that the present invention realizes that fume afterheat utilizes is:, will be electric by electrolysis flue gas heat exchanger 12 The waste heat classification of solution flue gas passes to condensed water and water supply, what reduction was extracted from turbine low pressure cylinder 3 and steam turbine high-pressure cylinder 2 Quantity of steam.In this way in the case where coal feeding amount is constant, generated output can be increased;Or guaranteeing the constant situation of generated output Under, reduce coal feeding amount.The system is provided with multiple valves, can be in the changed feelings of the parameters such as temperature of electrolysis flue gas, flow Under condition, the switching and adjustment of the method for operation are carried out, guarantees that entire electricity generation system efficiently and reliably works.
Embodiment 2
As shown in Fig. 2, a kind of aluminum cell smoke residual heat reclaiming, including aluminium cell 11, waste heat boiler 26, electrolysis flue gas Cleaning equipment 13, electrolysis flue gas air-introduced machine 14 and chimney 15;According to the trend of flue gas, connection relationship successively are as follows: aluminium electroloysis The high-temperature flue gas of slot 11 enters electrolysis flue gas heat exchanger 12 through smoke discharging pipe, and electrolysis flue gas exchanges heat in waste heat boiler 26, Electrolysis flue gas after heat exchange enters Smoke Gas Purity by Electrolysis equipment 13, the removing of dust and pollutant is carried out, most afterwards through chimney 15 It is discharged into ambient air.The aluminium cell 11 can be single aluminium cell, be also possible to what multiple aluminium cells composed in parallel Electrolytic cell group.
Coal generating system in Fig. 1, including coal-burning boiler 1, steam turbine high-pressure cylinder 2, turbine low pressure cylinder 3, generator 4, condenser 5, condensate pump 6, low-pressure heater 7, oxygen-eliminating device 8, feed pump 9, high-pressure heater 10 etc..The above equipment passes through water And vapor pipeline connects into an entirety, realizes a complete Rankine cycle system.Its course of work is as follows: fire coal is thrown Enter the vapor that 1 combustion heating water supply of coal-burning boiler generates high temperature and pressure, this process converts water for coal-fired chemical energy and steams The thermal energy of gas.High-temperature high-pressure steam initially enters steam turbine high-pressure cylinder 2 and carries out expansion work, and the steam for finishing function enters steamer The further expansion work of machine low pressure (LP) cylinder 3.The steam come out from turbine low pressure cylinder 3 enters condenser 5, carries out heat release and becomes to condense Water.Condensed water enters low-pressure heater 7 after condensate pump 6, and exchanges heat from the steam that turbine low pressure cylinder 3 extracts, Enter oxygen-eliminating device 8 later.Condensed water into oxygen-eliminating device 8 carries out mixing deoxygenation with the steam extracted from steam turbine high-pressure cylinder 2 Afterwards, it is boosted by feed pump 9.The water supply that feed pump 9 comes out enters high-pressure heater 10, and extracts from steam turbine high-pressure cylinder 2 After steam is exchanged heat, reenters coal-burning boiler 1 and heated.The steam extracted from steam turbine high-pressure cylinder 2 adds by high pressure Become high pressure draining after the heat exchange of hot device 10 is cooling and enter oxygen-eliminating device 8, the steam extracted from turbine low pressure cylinder 3, by low pressure plus It is hydrophobic to become low pressure after the hot heat exchange of device 7 is cooling, into condenser 5.
For the Rankine cycle system, the coupled modes of coal generating system and aluminum cell smoke residual heat reclaiming Are as follows: the condensed water that condensate pump 6 exports is divided into two-way, enters low-pressure heater 7 all the way, and another way enters low temperature water heater 24, two-way is respectively arranged with condensation water regulating valve 19 and low pressure waste heat condensation water regulating valve 21.According to 11 flue gas of aluminium cell The difference of the parameters such as temperature, flow, adjustment condensation water regulating valve 19 and low pressure waste heat condensation water regulating valve 21 aperture, adjust into Enter the water of low-pressure heater 7 and low temperature water heater 24.Extraction line between turbine low pressure cylinder 3 and low-pressure heater 7 On be provided with low-pressure pumping steam valve 17, based on enter low-pressure heater 7 condensing water flow, adjust low-pressure pumping steam valve 17 aperture, Control the steam extraction amount of low pressure (LP) cylinder.Residual heat of aluminum reduction cell quality is higher, in the enough situations of heat, can completely close condensed water Regulating valve 19 and low-pressure pumping steam valve 17.The condensed water come out from low temperature water heater 24 finally injects oxygen-eliminating device 8.
The water supply come out from feed pump 9 is divided into 2 tunnels, enters high-pressure heater 10 all the way, another way enters high-temperature water and adds Hot device 23, two-way are respectively arranged with feed-regulating valve 18 and high pressure waste heat feed-regulating valve 20.According to 11 flue gas of aluminium cell The difference of the parameters such as temperature, flow, adjusts the aperture of feed-regulating valve 18 and high pressure waste heat feed-regulating valve 20, and control enters low Press the water of heater 7 and high temperature water heater 23.It is set on extraction line between steam turbine high-pressure cylinder 2 and high-pressure heater 10 It is equipped with high pressure extraction valve 16, based on the feedwater flow for entering electrolysis flue gas heat exchanger 12, adjusts the aperture of high pressure extraction valve 16, control The steam extraction amount of high pressure cylinder processed.Under normal operating conditions, feed-regulating valve 18 is closed, high pressure waste heat feed-regulating valve 20 is opened, It reduces from the steam extraction in steam turbine high-pressure cylinder 2.There is event in aluminum cell smoke residual heat reclaiming or high temperature water heater 23 In the case where barrier, feed-regulating valve 18 is opened, closes high pressure waste heat water supply tune valve 20, is increased from the pumping in steam turbine high-pressure cylinder 2 Vapour guarantees system generated output and efficiency.
The high-temperature flue gas that aluminium cell 11 comes out enters waste heat boiler 26 by electrolysis flue gas general pipeline 25, in waste heat boiler 26 Middle heating aquatic products unboiled water steam, vapor a part of generation can be used as steam pumping 27, hot for industrial heat or life, and one Part enter high temperature water heater 23 heat water supply, be condensed into high temperature water heater 23 it is hydrophobic, and enter water at low temperature heat Device 24 converges with steam extraction return water 28 after heat-setting water, reenters waste heat boiler 26 after the pressurization of waste heat circulation water pump 22.
Based on above content, the principle that the present invention realizes that fume afterheat utilizes is: the fume high-temperature waste heat of aluminium cell 11, Heat flow is passed into waste heat circulation water by waste heat boiler 26 and forms high-temperature steam, high-temperature steam a part can be used as industry With the source of life steam, another part is by high temperature water heater 23 and low temperature water heater 24, respectively by heat transfer To condensed water and water supply, the quantity of steam extracted from turbine low pressure cylinder 3 and steam turbine high-pressure cylinder 2 is reduced, in this way in coal feeding amount In the case where constant, generated output can be increased;Or in the case where guaranteeing that generated output is constant, coal feeding amount is reduced, thus Realize energy-efficient purpose.The system is provided with multiple valves, the case where the parameters such as temperature of electrolysis flue gas, flow change Under, adjustable and switchover operation mode guarantees that entire electricity generation system efficiently and reliably works.
Pass through above embodiment, it can be seen that the present invention is especially suitable for electrolytic aluminium factories.When electrolytic aluminium factory construction has certainly When standby coal fired power plant, then electric energy is converted heat by a turbine generator system, then on the one hand private station can produce electricity It is able to satisfy demand of the electrolytic process to electricity, vapor is can produce in another aspect power plant thermodynamic cycle process and meets alumina producing Process heat demand in the process.Electrolytic aluminium factory is realized heat integration, is greatly reduced by independent management coal fired power plant Energy consumption cost.The thermal energy taste that burning generates in boiler is higher, therefore the generating efficiency of entire electricity generation system is also higher.It will electrolysis The recycling of low-grade flue gas waste heat is generated during aluminium reasonably to be coupled with coal generating system, is reduced coal feeding amount, be can be improved The flue gas waste heat recovery effect of aluminium cell, farthest improves economic and social benefit.
Embodiment 3
As shown in figure 3, a kind of aluminum cell smoke residual heat reclaiming, including aluminium cell 11, waste heat boiler 26, electrolysis flue gas Cleaning equipment 13, electrolysis flue gas air-introduced machine 14 and chimney 15;According to the trend of flue gas, connection relationship successively are as follows: aluminium electroloysis The high-temperature flue gas of slot 11 enters electrolysis flue gas heat exchanger 12 through smoke discharging pipe, and electrolysis flue gas exchanges heat in waste heat boiler 26, Electrolysis flue gas after heat exchange enters Smoke Gas Purity by Electrolysis equipment 13, the removing of dust and pollutant is carried out, most afterwards through chimney 15 It is discharged into ambient air.The aluminium cell 11 can be single aluminium cell, be also possible to what multiple aluminium cells composed in parallel Electrolytic cell group.
Coal generating system in Fig. 1, including coal-burning boiler 1, steam turbine high-pressure cylinder 2, Steam Turbine Through IP Admission 29, steam turbine Low pressure (LP) cylinder 3, generator 4, condenser 5, condensate pump 6, No.1 high-pressure heater 30, No. two high-pressure heaters 31, No.1 low pressure Heater 32, No. two low-pressure heaters 33, oxygen-eliminating device 8, feed pump 9 etc..The above equipment is connected by water and vapor pipeline One entirety realizes a complete Rankine cycle system.Its course of work is as follows: the fire coal investment burning of coal-burning boiler 1 is added Hot water supply generates the vapor of high temperature and pressure, this process converts coal-fired chemical energy to the thermal energy of vapor.High temperature and pressure Vapor initially enters steam turbine high-pressure cylinder 2 and carries out expansion work, and the steam for finishing function reenters boiler and reheated, then Steam after heating enters 29 expansion work of Steam Turbine Through IP Admission, the steam after intermediate pressure cylinder 29 finishes function, low into steam turbine The further expansion work of cylinder pressure 3.The steam come out from turbine low pressure cylinder 3 enters condenser 5, carries out heat release and becomes condensed water. Condensed water sequentially enters No. two low-pressure heaters 33 and No.1 low-pressure heater 32 after condensate pump 6, respectively and from steamer The steam that 3 two different locations of machine low pressure (LP) cylinder extract exchanges heat, and enters oxygen-eliminating device 8 later.Into oxygen-eliminating device 8 condensed water with After mixing deoxygenation is carried out from the steam extracted in Steam Turbine Through IP Admission 29, boosted by feed pump 9.The water supply that feed pump 9 comes out No. two high-pressure heaters 31 and No.1 high-pressure heater 30 are sequentially entered, is extracted respectively with from 2 two positions of steam turbine high-pressure cylinder Steam exchanged heat after, reenter coal-burning boiler 1 and heated.The steam extracted from steam turbine high-pressure cylinder 2 passes through No. two Become high pressure draining after high-pressure heater 31 and the heat exchange of No.1 high-pressure heater 30 are cooling and enter oxygen-eliminating device 8, from steam turbine low-pressure The steam that cylinder 3 extracts, it is hydrophobic to become low pressure after No.1 low-pressure heater 32 and the heat exchange of No. two low-pressure heaters 33 are cooling, into Enter condenser 5.
For the Rankine cycle system, the coupled modes of coal generating system and aluminum cell smoke residual heat reclaiming Are as follows: the condensed water that condensate pump 6 exports is divided into two-way, enters No. two low-pressure heaters 33 all the way, another way enters water at low temperature and adds Hot device 24, two-way are respectively arranged with condensation water regulating valve 19 and low pressure waste heat condensation water regulating valve 21.According to 11 cigarette of aluminium cell The difference of the parameters such as temperature, the flow of gas, the aperture of adjustment condensation water regulating valve 19 and low pressure waste heat condensation water regulating valve 21, is adjusted The whole water into low-pressure heater 7 and low temperature water heater 24.Between turbine low pressure cylinder 3 and No. two low-pressure heaters 33 Low-pressure pumping steam valve 17 is provided on extraction line, based on the condensing water flow for entering No. two low-pressure heaters 33, adjustment low pressure is taken out The aperture of steam valve 17 controls the steam extraction amount of low pressure (LP) cylinder.Residual heat of aluminum reduction cell quality is higher, in the enough situations of heat, can be with Completely close condensation water regulating valve 19 and low-pressure pumping steam valve 17.The condensed water come out from low temperature water heater 24 is finally and from two After the condensed water that number low-pressure heater 33 comes out converges, into No.1 low-pressure heater 32.
The water supply come out from feed pump 9 is divided into 2 tunnels, enters No. two high-pressure heaters 31 all the way, another way enters high temperature Water heater 23, two-way are respectively arranged with feed-regulating valve 18 and high pressure waste heat feed-regulating valve 20.According to 11 cigarette of aluminium cell The difference of the parameters such as temperature, the flow of gas, adjust feed-regulating valve 18 and high pressure waste heat feed-regulating valve 20 aperture, control into Enter the water of No. two high-pressure heaters 31 and high temperature water heater 23.Water supply note is heated portion of into high temperature water heater 23 Pipeline after entering No. two high temperature heater (HTH)s converges with the water supply come out after No. two high temperature heater (HTH)s, is heated at high temperature into No. 1 Device.It is provided with high pressure extraction valve 16 on extraction line between steam turbine high-pressure cylinder 2 and No. two high-pressure heaters 31, based on entrance The feedwater flow of electrolysis flue gas heat exchanger 12 adjusts the aperture of high pressure extraction valve 16, controls the steam extraction amount of high pressure cylinder.Normally transporting In row situation, according to the heat exchange power size of high temperature water heater 23, feed-regulating valve 18 is adjusted to appropriate aperture, opens high pressure Waste heat feed-regulating valve 20 is reduced from the steam extraction in steam turbine high-pressure cylinder 2.In aluminum cell smoke residual heat reclaiming or high temperature In the case that water heater 23 breaks down, big feed-regulating valve 18 is opened, closes high pressure waste heat water supply tune valve 20, is increased from steamer Steam extraction in machine high pressure cylinder 2 guarantees system generated output and efficiency.
The high-temperature flue gas that aluminium cell 11 comes out enters waste heat boiler 26, and aquatic products unboiled water is heated in waste heat boiler 26 and is steamed Vapor a part of gas, generation can be used as steam pumping 27, add for industrial heat or life heat, a part into high-temperature water Hot device 23 heats water supply, is condensed into high temperature water heater 23 hydrophobic, and enters water at low temperature heater 24, after heat-setting water Converge with steam extraction return water 28, reenters waste heat boiler 26 after the pressurization of waste heat circulation water pump 22.
Based on above content, the principle that the present invention realizes that fume afterheat utilizes is: the fume high-temperature waste heat of aluminium cell 11, Heat flow is passed into waste heat circulation water by waste heat boiler 26 and forms high-temperature steam, high-temperature steam a part can be used as industry With the source of life steam, another part is by high temperature water heater 23 and low temperature water heater 24, respectively by heat transfer To condensed water and water supply, the quantity of steam extracted from turbine low pressure cylinder 3 and steam turbine high-pressure cylinder 2 is reduced, in this way in coal feeding amount In the case where constant, generated output can be increased;Or in the case where guaranteeing that generated output is constant, coal feeding amount is reduced, thus Realize energy-efficient purpose.The system is provided with multiple valves, the case where the parameters such as temperature of electrolysis flue gas, flow change Under, adjustable and switchover operation mode guarantees that entire electricity generation system efficiently and reliably works.
Pass through above embodiment, it can be seen that the present invention is especially suitable for electrolytic aluminium factories.When electrolytic aluminium factory construction has certainly When standby coal fired power plant, then electric energy is converted heat by a turbine generator system, then on the one hand private station can produce electricity It is able to satisfy demand of the electrolytic process to electricity, vapor is can produce in another aspect power plant thermodynamic cycle process and meets alumina producing Process heat demand in the process.Electrolytic aluminium factory is realized heat integration, is greatly reduced by independent management coal fired power plant Energy consumption cost.The thermal energy taste that burning generates in boiler is higher, therefore the generating efficiency of entire electricity generation system is also higher.It will electrolysis The recycling of low-grade flue gas waste heat is generated during aluminium reasonably to be coupled with coal generating system, is reduced coal feeding amount, be can be improved The flue gas waste heat recovery effect of aluminium cell, farthest improves economic and social benefit.

Claims (9)

1. a kind of aluminum cell smoke residual heat reclaiming, it is characterised in that: including aluminium cell (11), heat exchange equipment, electrolysis Flue gas purifying equipment (13), electrolysis flue gas air-introduced machine (14) and chimney (15);According to the trend of flue gas, connection relationship successively Are as follows: the high-temperature flue gas of aluminium cell (11) enters heat exchange equipment through smoke discharging pipe, and electrolysis flue gas exchanges heat in heat exchange equipment, Electrolysis flue gas after heat exchange enters Smoke Gas Purity by Electrolysis equipment (13), the removing of dust and pollutant is carried out, most afterwards through chimney (15) it is discharged into ambient air;The water supply of the heat exchange equipment access coal generating system or condensed water are changed with electrolysis flue gas Heat.
2. aluminum cell smoke residual heat reclaiming according to claim 1, it is characterised in that: the aluminium cell (11) It is the electrolytic cell group that single aluminium cell or multiple aluminium cells compose in parallel.
3. aluminum cell smoke residual heat reclaiming according to claim 1, it is characterised in that: the coal generating system Including coal-burning boiler (1), steam turbine high-pressure cylinder (2), turbine low pressure cylinder (3), generator (4), condenser (5), condensate pump (6), low-pressure heater (7), oxygen-eliminating device (8), feed pump (9), high-pressure heater (10), are connected by water and vapor pipeline One Rankine cycle system.
4. aluminum cell smoke residual heat reclaiming according to claim 3, it is characterised in that: the coal generating system It further include Steam Turbine Through IP Admission (29).
5. aluminum cell smoke residual heat reclaiming according to claim 1, it is characterised in that: the heat exchange equipment is electricity Solve flue gas heat-exchange unit (12) or waste heat boiler (26).
6. aluminum cell smoke residual heat reclaiming according to claim 1, which is characterized in that when heat exchange equipment is electrolysis When flue gas heat-exchange unit (12), the coupled modes of coal generating system and aluminum cell smoke residual heat reclaiming are as follows:
The condensed water of condensate pump (6) outlet of coal generating system is divided into two-way, enters low-pressure heater (7) all the way, another Road enters electrolysis flue gas heat exchanger (12), and two-way is respectively arranged with the condensed water adjusting that control enters low-pressure heater (7) water Valve (19) and control enter the low pressure waste heat condensate valve (21) of electrolysis flue gas heat exchanger (12) water;
The water supply come out in the feed pump (9) of coal generating system is divided into two-way, enters high-pressure heater (10) all the way, another way Into electrolysis flue gas heat exchanger (12), two-way is respectively arranged with the feed-regulating valve that control enters high-pressure heater (10) water (18) and control enter electrolysis flue gas heat exchanger (12) water high pressure waste heat feed-regulating valve (20);
The condensed water come out from electrolysis flue gas heat exchanger (12) finally injects oxygen-eliminating device (8).
7. aluminum cell smoke residual heat reclaiming according to claim 1, which is characterized in that when heat exchange equipment is waste heat When boiler (26), it is provided with high temperature water heater (23), low temperature water heater (24), specific connection type and coal fired power generation System and the coupled modes of aluminum cell smoke residual heat reclaiming are as follows:
The condensed water of condensate pump (6) outlet is divided into two-way, enters low-pressure heater (7) all the way, another way enters water at low temperature and adds Hot device (24), two-way are respectively arranged with control and enter the condensate valve (19) of low-pressure heater (7) water and control into low temperature The low pressure waste heat of water heater (24) water condenses water regulating valve (21);
The water supply come out from feed pump (9) is divided into two-way, enters high-pressure heater (10) all the way, another way enters high-temperature water and adds Hot device (23), two-way are respectively arranged with feed-regulating valve (18) and the control entrance that control enters high-pressure heater (10) confluent The high pressure waste heat feed-regulating valve (18) of high temperature water heater (23) confluent;
The condensed water come out from low temperature water heater (24) finally injects oxygen-eliminating device (8);
The high-temperature flue gas come out from aluminium cell (11) enters waste heat boiler (26), and aquatic products unboiled water is heated in waste heat boiler (26) Vapor a part of steam, generation enters high-temperature water for industrial heat or life heat, another part as steam pumping (27) Heater (23) heats water supply, is condensed into the high temperature water heater (23) hydrophobic, and enters water at low temperature heater (24), heating Converge after condensed water with steam extraction return water (28), reenters waste heat boiler (26) after waste heat circulation water pump (22) pressurization.
8. aluminum cell smoke residual heat reclaiming according to claim 6 or 7, it is characterised in that: in steam turbine low-pressure It is provided with low-pressure pumping steam valve (17) on extraction line between cylinder (3) and low-pressure heater (7), is based on entering low-pressure heater (7) condensing water flow adjusts the aperture of low-pressure pumping steam valve (17), controls the steam extraction amount of low pressure (LP) cylinder.
9. aluminum cell smoke residual heat reclaiming according to claim 6 or 7, it is characterised in that: in turbine high-pressure It is provided with high pressure extraction valve (16) on extraction line between cylinder (2) and high-pressure heater (10), is changed based on electrolysis flue gas is entered The feedwater flow of hot device (12) adjusts the aperture of high pressure extraction valve (16), controls the steam extraction amount of high pressure cylinder.
CN201910157439.8A 2019-03-01 2019-03-01 A kind of aluminum cell smoke residual heat reclaiming Pending CN109811369A (en)

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CN101444699A (en) * 2008-12-16 2009-06-03 刘存宝 Technical method for removing sulfur dioxide in flue gas by using sodium sulfite and equipment thereof
CN202116671U (en) * 2011-06-22 2012-01-18 运城市关铝设备材料有限公司 Electrolysis flue gas waste heat recovery device for electrolytic bath
CN103046080A (en) * 2012-12-28 2013-04-17 北京世纪源博科技股份有限公司 System for recycling electrolytic gas
CN104676971A (en) * 2014-12-23 2015-06-03 西安交通大学 Brown coal pre-drying power-heat generation water recycling system of integrated absorption type heat pump
CN205474028U (en) * 2015-12-29 2016-08-17 中国铝业股份有限公司 Aluminium electroloysis flue gas waste heat utilization system
CN108626713A (en) * 2018-04-08 2018-10-09 大唐(北京)能源管理有限公司 A kind of power plant soot steam extraction drying UTILIZATION OF VESIDUAL HEAT IN integral system
CN108868918A (en) * 2018-06-22 2018-11-23 山东电力工程咨询院有限公司 Nuclear energy couples efficient power generation system and method with non-core fuel tape reheating double-strand
CN109157961A (en) * 2018-11-14 2019-01-08 中国科学院过程工程研究所 A kind of multi-pollutant joint removing means, method and the purposes of electrolytic aluminium carbon anode roasting flue gas

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101444699A (en) * 2008-12-16 2009-06-03 刘存宝 Technical method for removing sulfur dioxide in flue gas by using sodium sulfite and equipment thereof
CN202116671U (en) * 2011-06-22 2012-01-18 运城市关铝设备材料有限公司 Electrolysis flue gas waste heat recovery device for electrolytic bath
CN103046080A (en) * 2012-12-28 2013-04-17 北京世纪源博科技股份有限公司 System for recycling electrolytic gas
CN104676971A (en) * 2014-12-23 2015-06-03 西安交通大学 Brown coal pre-drying power-heat generation water recycling system of integrated absorption type heat pump
CN205474028U (en) * 2015-12-29 2016-08-17 中国铝业股份有限公司 Aluminium electroloysis flue gas waste heat utilization system
CN108626713A (en) * 2018-04-08 2018-10-09 大唐(北京)能源管理有限公司 A kind of power plant soot steam extraction drying UTILIZATION OF VESIDUAL HEAT IN integral system
CN108868918A (en) * 2018-06-22 2018-11-23 山东电力工程咨询院有限公司 Nuclear energy couples efficient power generation system and method with non-core fuel tape reheating double-strand
CN109157961A (en) * 2018-11-14 2019-01-08 中国科学院过程工程研究所 A kind of multi-pollutant joint removing means, method and the purposes of electrolytic aluminium carbon anode roasting flue gas

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