CN111482086A - Boiler flue gas cooperative treatment environmental protection equipment and treatment process - Google Patents
Boiler flue gas cooperative treatment environmental protection equipment and treatment process Download PDFInfo
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- CN111482086A CN111482086A CN202010314897.0A CN202010314897A CN111482086A CN 111482086 A CN111482086 A CN 111482086A CN 202010314897 A CN202010314897 A CN 202010314897A CN 111482086 A CN111482086 A CN 111482086A
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Abstract
The boiler flue gas enters a high-temperature side channel of a GGH heat exchanger, a first flue-gas heat exchanger, a low-temperature dust remover, an induced draft fan, a low-temperature side channel of the GGH heat exchanger, a denitration SCR reactor, a second flue-gas heat exchanger and a desulfurization device through a smoke exhaust outlet at the tail part of the boiler in sequence, and the flue gas is discharged into the atmosphere through a chimney after heat exchange of each device, standard removal of pollutants and white elimination. The invention has the advantages that: the heat exchange, denitration, dust removal and desulfurization process equipment is rearranged and integrated to form a scientific and synergistic flue gas comprehensive treatment process flow, so that the effective unification of investment cost, energy conservation, safety and reliability, economy and environmental protection is realized, and the beneficial effects of flue gas environmental-protection standard emission, water lifting and white control, full-working-condition full-load denitration, catalyst service life prolonging, denitration efficiency improving, air preheater blockage preventing, investment cost reducing, operation and maintenance cost reducing and equipment failure rate reducing are finally realized.
Description
Technical Field
The invention relates to the field of environmental protection by boiler flue gas cooperative treatment, wherein flue gas is discharged from a boiler, is cooled and dedusted, then is heated and denitrated, and is further subjected to heat exchange and cooling to enter a desulfurization or other flue gas treatment device, so that the cooperative comprehensive treatment of the flue gas is realized.
Background
The environmental protection requirement is increasingly strict, and the realization of clean emission of flue gas is a development trend. The Selective Catalytic Reduction (SCR) method has high NOx removal efficiency, is widely used for treating flue gas of a boiler of a coal-fired unit of a thermal power plant at present, and adopts SCR denitration, heat exchange, dust removal, an induced draft fan, heat exchange and wet desulphurization processes in the synergistic treatment of the flue gas.
The denitration SCR mostly adopts high-ash arrangement, and the catalyst is subject to scouring wear and blockage, and has the problems of short service life, high ammonia escape, low temperature, incapability of running, difficulty in realizing full-load full-working-condition denitration and the like; after denitration, the air preheater generally has the problems of air leakage, low-temperature corrosion, dust deposition, ABS blockage, increased resistance and the like, and the problems of high smoke exhaust temperature, high moisture content, high water consumption, high smoke whitening investment, high operating cost and the like after wet desulphurization.
The above problems have a series of effects: the negative pressure period fluctuation of a hearth, the surge of a fan, the large air pressure, the large differential pressure of an air preheater, the high exhaust gas temperature, the incapability of automatic full load, the large water consumption, the incomplete white water elimination, the difficult operation control, the increase of the operation cost and the maintenance cost, the reduction of the service life of equipment and the incapability of safe, economical and efficient operation are caused.
Disclosure of Invention
The invention aims to realize that the boiler flue gas is discharged from a boiler, is cooled and dedusted firstly, then is heated and denitrated, the denitrated flue gas is further subjected to heat exchange and cooling and enters a desulfurization or other flue gas treatment device, so that the synergistic comprehensive treatment of the flue gas is realized, the problems of short service life, low utilization rate, blockage of an air preheater, high differential pressure, whitening, large water lifting investment and high operation cost are solved, the operation and maintenance cost is reduced, the equipment failure rate is reduced, the safety, reliability, economy and civilized production are improved, the high-efficiency production of a coal-fired thermal power plant is realized, the generation and treatment period of solid waste pollutants is reduced, and the equipment is suitable for the intense market economy competition environment.
The invention provides an environment-friendly device for boiler flue gas cooperative treatment, which is characterized in that: the boiler smoke cooperative treatment environmental protection equipment comprises a boiler smoke exhaust outlet flue and a GGH heat exchanger which are divided into a high-temperature side channel, a low-temperature side channel and a smoke-gas heat exchangerFirst, flue before dust removal, low temperature dust remover, flue after dust removal, draught fan, denitration SCR inlet flue, flue gas accuse temperature dust collector, NH3The device comprises an injection uniform distribution device, a denitration SCR reactor, a smoke-gas heat exchanger II, a denitration SCR outlet flue, a desulfurization inlet flue, a desulfurization device, a desulfurization outlet flue, a chimney, a cold air inlet channel, a cold and hot air channel and a hot air outlet channel;
wherein: boiler flue gas enters a high-temperature side channel of a GGH heat exchanger through a smoke exhaust outlet flue and then enters a dust removal front flue through a first smoke-gas heat exchanger, the dust removal front flue is connected with a low-temperature dust remover, the boiler flue gas is dedusted by the low-temperature dust remover and then flows into a dedusted flue to enter an induced draft fan for pressurization, then enters a low-temperature side channel of the GGH heat exchanger to exchange heat with the flue gas of the high-temperature side channel of the GGH heat exchanger for heating, the low-temperature side channel of the GGH heat exchanger is connected with a denitration SCR reactor, the flue gas of the low-temperature side channel of the GGH heat exchanger3The injection uniform distribution device is communicated with the denitration SCR reactor, the denitration SCR reactor is connected with the second smoke-gas heat exchanger, the denitration SCR outlet flue and the desulfurization inlet flue, the desulfurization inlet flue is connected with the desulfurization outlet flue through the desulfurization device, and the desulfurization outlet flue is connected with the chimney.
Cold air flows into the cold air inlet channel to perform primary heat exchange with the flue gas through the first flue gas-gas heat exchanger for heating, flows into the second flue gas-gas heat exchanger through the cold air channel to perform primary heat exchange with the flue gas for heating, then enters the boiler, and supports combustion for the combustor.
The GGH heat exchanger is divided into a high-temperature side channel and a low-temperature side channel and can be a 2, 4 or multi-bin rotary heat exchange device.
The first flue gas-gas heat exchanger can be composed of a partial water pipeline, a flue gas channel and a cold air duct in the grading economizer.
The low-temperature dust collector can be an electrostatic dust collector, a bag type dust collector or an electric-bag composite dust collector.
The boiler flue gas cooperative treatment environmental protection equipment comprises an induced draft fan, and the induced draft fan can be in an induced-increased integrated mode or an induced-increased independent combined mode.
The flue gas temperature control dust removal device is provided with flue gasA clean hot air generator with a temperature increasing function or a cooler with a smoke cooling function, wherein the dust removing device is in the form of a high-temperature dust remover, a bag-type dust remover or a cyclone separator; the NH3The spraying and uniform distribution device is a turbulence generator or a nozzle grid plus a rectifier.
The denitration SCR reactor is a device for removing NOx by using a selective catalytic reduction method and comprises a guide plate, a rectifying grid, a catalyst and a soot blower; the desulfurization device is a wet desulfurization system device and comprises an absorption tower, a slurry supply system, a slurry circulating system, an oxidation system and the like.
The treatment process of the boiler flue gas cooperative treatment environmental protection equipment according to the claim 1, characterized in that: the treatment process of the boiler flue gas synergistic treatment environmental protection equipment is characterized in that boiler flue gas enters a high-temperature side channel of a GGH heat exchanger through a smoke exhaust outlet flue and then enters a dust removal front flue through a flue-gas heat exchanger, the dust removal front flue is connected with a low-temperature dust remover, the boiler flue gas flows into a dust removal rear flue after being removed dust through the low-temperature dust remover and then enters an induced draft fan for pressurization, then the boiler flue gas enters a low-temperature side channel of the GGH heat exchanger to exchange heat with flue gas in the high-temperature side channel of the GGH heat exchanger for warming, the low-temperature side channel of the GGH heat exchanger is connected with a denitration SCR reactor, the flue gas of the low3And the spraying uniform distribution device enters a denitration SCR reactor for denitration, the denitrated flue gas passes through a flue gas-gas heat exchanger II, the heat exchange and temperature reduction flow enters a desulfurization device through an SCR outlet flue and a desulfurization inlet flue, and finally, the purified flue gas is discharged into the atmosphere through a desulfurization outlet flue and a chimney.
High-temperature (about 340 ℃) and high-dust-content flue gas at an outlet after heat exchange of a boiler economizer passes through a high-temperature side channel of a GGH heat exchanger to release heat to low-temperature side channel flue gas (the heat exchange efficiency is about 0.93), the high-temperature flue gas is cooled to about 145 ℃, then the high-temperature flue gas and cold air are subjected to heat exchange through a first flue-gas heat exchanger and cooled to about 120 ℃, the high-temperature flue gas enters a low-temperature dust remover to remove dust efficiently, and the dust concentration is removed to be less than 15mg/Nm3。
The low-dust flue gas after dust removal is pressurized and heated to about 130 ℃ by a draught fan, is sent into a low-temperature side channel of a GGH heat exchanger to absorb heat and is heated to about 320 ℃,flowing out to a denitration SCR reactor for selective catalytic reduction reaction, and removing NOx in the dedusted flue gas to a concentration of less than 30mg/Nm3。
The denitrated low-dust low-NOx flue gas is subjected to heat exchange with the cold air after heat absorption through a flue gas-gas heat exchanger II and is cooled to about 85 ℃, and then the flue gas enters a desulfurization device to remove SO2Concentration removal to less than 10mg/Nm3And finally discharging the clean flue gas reaching the standard to the atmosphere.
Cold air at about 20 ℃ is preheated to about 55 ℃ by absorbing the heat released by the flue gas through the first flue gas-gas heat exchanger, and is heated to about 300 ℃ by absorbing the heat released by the denitrated flue gas through the second flue gas-gas heat exchanger through the cold and hot air duct to become hot air, and the hot air is used as primary air and secondary air and is sent into a boiler hearth for combustion.
The GGH heat exchanger can realize that the high-temperature flue gas before dust removal is used for heating the low-temperature flue gas after dust removal, so that the temperature of the flue gas entering the denitration SCR reactor reaches over 320 ℃ and does not exceed the temperature of the high-temperature flue gas, the flue gas reaches the proper temperature of a medium-temperature and high-temperature denitration SCR process, and the over-temperature sintering of the catalyst can be effectively prevented. The denitration temperature that can require to reach according to operating condition sets up reasonable arrangement position and structural style. Because the GGH heat exchanger is arranged in front of the denitration SCR reactor, ABS problem can be not considered, the conventional design (total height of heat transfer elements is reduced) is adopted, the manufacturing cost can be saved, the unilateral resistance is reduced by 150-200Pa, the operation pressure is stable, the differential pressure is small, and the periodic fluctuation of the negative pressure of a hearth and the surging of a fan can be prevented. And the heat exchange of cold air is avoided, the air leakage loss is reduced by about 0.8-1.5%, the whole smoke volume is reduced under the same temperature and pressure conditions, the smoke volume processed by the corresponding smoke processing device is reduced, the size is smaller, and the occupied area and the investment are reduced.
The first flue gas-gas heat exchanger can continuously heat cold air at about 20 ℃ by using the flue gas heat at about 145 ℃ after being cooled by the high-temperature channel of the GGH heat exchanger, the flue gas is cooled to about 120 ℃, the cold air at about 20 ℃ is preheated to about 55 ℃, and the cold air flows to the second flue gas-gas heat exchanger through the cold and hot air channel to be further heated.
The low-temperature dust remover can realize high-efficiency dust removal, reduce the dust concentration in the flue gas entering the denitration SCR reactor, reduce the influence of the fly ash on the fly ash scouring, blocking or poisoning of the catalyst, and prolong the service life of the catalyst. The low-temperature dust remover is reliably arranged below or near the boiler tail flue, is compactly arranged, shortens the length of the flue, reduces the resistance and reduces the manufacturing cost.
The draught fan can realize stabilizing furnace negative pressure, provide the effect of draught fan back flue gas flow power, what GGH low temperature side passageway flowed in is draught fan export malleation dust removal back flue gas, what GGH high temperature side passageway flowed in is draught fan entry negative pressure dust removal front flue gas, so low temperature dust removal back flue gas pressure is greater than high temperature dust removal front flue gas pressure, can prevent that the dust removal front flue gas from carrying the dust to the dust removal back flue gas side leakage, influence dust emission concentration.
The flue gas temperature control dust removal device can realize the flue gas preheating or overtemperature prevention effect before the boiler unit is started, and can temporarily heat by using the flue gas temperature control device during the period from the ignition of the boiler to the flue gas temperature reaching the denitration proper temperature, so that the full-working-condition denitration is realized; when the temperature of the flue gas entering the denitration SCR reactor is too high, the temperature can be reduced, so that the high-temperature sintering of the catalyst is prevented; when the GGH heat exchanger uses a rotary heat exchanger, the dust in the channel is carried, and when the carrying amount is too large to influence the dust emission concentration, the dust can be removed for the second time by using the dust removal device, so that the standard exceeding emission is avoided.
The denitration SCR reactor can realize high-efficiency NOx removal, the arrangement position can be reasonably selected according to the site space, the flow field can be optimized, the flue gas temperature is appropriate, high-concentration dust is avoided, the catalyst is good in use environment, the selective catalytic reduction reaction can be carried out with high activity and high efficiency, NOx removal is carried out, the ammonia nitrogen molar ratio can be close to a theoretical value, and the ammonia consumption and the ammonia escape are reduced.
The second flue gas-gas heat exchanger can continuously heat the preheated cold air at about 55 ℃ by utilizing the heat of the flue gas at about 320 ℃ at the outlet of the denitration SCR reactor, the temperature of the flue gas is reduced to about 85 ℃, the preheated cold air at about 55 ℃ is heated to about 300 ℃, and the flue gas is fed into the hearth. Because the air volume and the air temperature of the preheated cold air are adjustable, the flue gas temperature of the outlet flue of the denitration SCR is adjustable and controllable, so that the flue gas temperature of the desulfurization inlet is reduced, the flue gas volume is reduced, the flow rate is reduced, and the manufacturing cost of a desulfurization device is reduced; because the temperature of the flue gas at the desulfurization inlet is low and can be adjusted to be low, the temperature of the flue gas discharged into the atmosphere can be reduced, and the double effects of water lifting and whitening removal are achieved.
The flue gas process flow of the application is as follows:
high-temperature (about 340 ℃) and high-dust-content flue gas at an outlet after heat exchange of a boiler economizer passes through a high-temperature side channel of a GGH heat exchanger to release heat to low-temperature side channel flue gas (the heat exchange efficiency is about 0.93), the high-temperature flue gas is cooled to about 145 ℃, then the high-temperature flue gas and cold air are subjected to heat exchange through a first flue-gas heat exchanger and cooled to about 120 ℃, the high-temperature flue gas enters a low-temperature dust remover to remove dust efficiently, and the dust concentration is removed to be less than 15mg/Nm3。
Pressurizing and heating the dedusted low-dust flue gas to about 130 ℃ by a draught fan, sending the low-dust flue gas into a low-temperature side channel of a GGH heat exchanger to absorb heat and heat to about 320 ℃, flowing out to a denitration SCR reactor to perform selective catalytic reduction reaction, and removing the concentration of NOx in the dedusted flue gas to be less than 30mg/Nm3。
And the denitrated low-dust and low-NOx flue gas is subjected to heat exchange with the cold air after heat absorption through a flue gas-gas heat exchanger II and is cooled to about 85 ℃, the flue gas enters a desulfurization device, the concentration of SO2 is removed to be less than 10mg/Nm3, and the clean flue gas reaching the standard is finally discharged to the atmosphere.
The air process flow of the application is as follows:
cold air at about 20 ℃ is preheated to about 55 ℃ by absorbing the heat released by the flue gas through the first flue gas-gas heat exchanger, and is heated to about 300 ℃ by absorbing the heat released by the denitrated flue gas through the second flue gas-gas heat exchanger through the cold and hot air duct to become hot air, and the hot air is used as primary air and secondary air and is sent into a boiler hearth for combustion.
The invention has the advantages that:
by using a GGH heat exchanger, a first smoke-gas heat exchanger, a low-temperature dust remover, a draught fan, a smoke temperature control dust remover and NH3The effective combination of the injection uniform distribution device, the denitration SCR reactor, the smoke-gas heat exchanger II and the desulfurization device forms an organic whole with relatively independent devices through the cooperative management of arrangement positions and process flows, and the effective unification of investment cost, energy conservation, safety and reliability, economy and environmental protection is realized. Finally realizing the cigaretteThe method has the beneficial effects of environment-friendly and standard-reaching discharge of gas, water lifting and white control, full-working-condition full-load denitration, prolonging the service life of the catalyst, improving the denitration efficiency, preventing the blockage of an air preheater, reducing the investment cost, reducing the operation and maintenance cost and reducing the equipment failure rate.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic view of an environmental protection device and a treatment process for synergistic treatment of boiler flue gas;
in the figure, 1 boiler smoke outlet flue and 2GGH heat exchanger are divided into a high-temperature side channel, a low-temperature side channel, 3 smoke-gas heat exchanger I, 4 dust removal front flue, 5 low-temperature dust remover, 6 dust removal rear flue, 7 induced draft fan, 8 denitration SCR inlet flue, 9 denitration SCR reactor, 10 smoke-gas heat exchanger II, 11 denitration SCR outlet flue, 12 desulfurization inlet flue, 13 desulfurization device, 14 desulfurization outlet flue, 15 chimney, 16 cold air inlet channel, 17 cold and hot air channel, 18 hot air outlet channel, 19 smoke temperature control and dust removal device, 20 NH3And the spraying and uniform distribution device.
Detailed Description
Examples
This embodiment provides a boiler flue gas administers environmental protection equipment in coordination, its characterized in that: the boiler flue gas cooperative treatment environmental protection equipment comprises a boiler flue gas outlet flue, a GGH heat exchanger which is divided into a high-temperature side channel, a low-temperature side channel, a first flue of a flue-gas heat exchanger, a flue before dust removal, a low-temperature dust remover, a flue after dust removal, an induced draft fan, a denitration SCR inlet flue, a flue gas temperature control dust removal device, an NH (NH) device3The device comprises an injection uniform distribution device, a denitration SCR reactor, a smoke-gas heat exchanger II, a denitration SCR outlet flue, a desulfurization inlet flue, a desulfurization device, a desulfurization outlet flue and a chimney;
wherein: boiler flue gas enters a high-temperature side channel of the GGH heat exchanger through a smoke exhaust outlet flue and then enters a dust removal front flue through a first flue-gas heat exchanger, the dust removal front flue is connected with a low-temperature dust remover, the flue gas flows into a dust removal rear flue after being removed dust by the low-temperature dust remover to enter an induced draft fan for pressurization, then enters a low-temperature side channel of the GGH heat exchanger to exchange heat with the flue gas of the high-temperature side channel of the GGH heat exchanger toThe low-temperature side channel of the GGH heat exchanger is connected with the denitration SCR reactor, flue gas flowing out of the low-temperature side channel of the GGH heat exchanger enters the inlet flue of the denitration SCR, and the inlet flue of the denitration SCR is connected with a flue gas temperature control dust removal device and NH3The injection uniform distribution device is communicated with the denitration SCR reactor, the denitration SCR reactor is connected with the second smoke-gas heat exchanger, the denitration SCR outlet flue and the desulfurization inlet flue, the desulfurization inlet flue is connected with the desulfurization outlet flue through the desulfurization device, and the desulfurization outlet flue is connected with the chimney.
The GGH heat exchanger is divided into a high-temperature side channel and a low-temperature side channel and can be a 2, 4 or multi-bin rotary heat exchange device.
The first flue gas-gas heat exchanger can be composed of a partial water pipeline, a flue gas channel and a cold air duct in the grading economizer.
The low-temperature dust collector can be an electrostatic dust collector, a bag type dust collector or an electric-bag composite dust collector.
The boiler flue gas cooperative treatment environmental protection equipment comprises an induced draft fan, and the induced draft fan can be in an induced-increased integrated mode or an induced-increased independent combined mode.
The smoke temperature control dust removal device is a cooler with a smoke temperature reduction function of a clean hot air generator with a smoke temperature increasing function, wherein the dust removal device is in the form of a high-temperature dust remover, a bag-type dust remover or a cyclone separator; the NH3The spraying and uniform distribution device is a turbulence generator or a nozzle grid plus a rectifier.
The denitration SCR reactor is a device for removing NOx by using a selective catalytic reduction method and comprises a guide plate, a rectifying grid, a catalyst and a soot blower; the desulfurization device is a wet desulfurization system device and comprises an absorption tower, a slurry supply system, a slurry circulating system, an oxidation system and the like.
The treatment process of the boiler flue gas cooperative treatment environmental protection equipment according to the claim 1, characterized in that: the treatment process of the boiler flue gas cooperative treatment environmental protection equipment is characterized in that the boiler flue gas enters a high-temperature side channel of the GGH heat exchanger through a smoke exhaust outlet flue and then enters a dust removal front flue through a flue-gas heat exchanger, the dust removal front flue is connected with a low-temperature dust remover, and the dust removal front flue is removed through the low-temperature dust removerThe dust flows into the dust removal flue after entering the draught fan for pressurization, then enters the low-temperature side channel of the GGH heat exchanger for heat exchange and temperature rise with the high-temperature side channel flue gas of the GGH heat exchanger, the low-temperature side channel of the GGH heat exchanger is connected with the denitration SCR reactor, the low-temperature side channel flue gas of the GGH heat exchanger flows out to enter the inlet flue of the denitration SCR, and passes through the flue gas temperature control dust removal device and the NH3And the spraying uniform distribution device enters a denitration SCR reactor for denitration, the denitrated flue gas passes through a flue gas-gas heat exchanger II, the heat exchange and temperature reduction flow enters a desulfurization device through an SCR outlet flue and a desulfurization inlet flue, and finally, the purified flue gas is discharged into the atmosphere through a desulfurization outlet flue and a chimney.
High-temperature (about 340 ℃) and high-dust-content flue gas at an outlet after heat exchange of a boiler economizer passes through a high-temperature side channel of a GGH heat exchanger to release heat to low-temperature side channel flue gas (the heat exchange efficiency is about 0.93), the high-temperature flue gas is cooled to about 145 ℃, then the high-temperature flue gas and cold air are subjected to heat exchange through a first flue-gas heat exchanger and cooled to about 120 ℃, the high-temperature flue gas enters a low-temperature dust remover to remove dust efficiently, and the dust concentration is removed to be less than 15mg/Nm3。
Pressurizing and heating the dedusted low-dust flue gas to about 130 ℃ by a draught fan, sending the low-dust flue gas into a low-temperature side channel of a GGH heat exchanger to absorb heat and heat to about 320 ℃, flowing out to a denitration SCR reactor to perform selective catalytic reduction reaction, and removing the concentration of NOx in the dedusted flue gas to be less than 30mg/Nm3。
The denitrated low-dust low-NOx flue gas is subjected to heat exchange with the cold air after heat absorption through a flue gas-gas heat exchanger II and is cooled to about 85 ℃, and then the flue gas enters a desulfurization device to remove SO2Concentration removal to less than 10mg/Nm3And finally discharging the clean flue gas reaching the standard to the atmosphere.
Cold air at about 20 ℃ is preheated to about 55 ℃ by absorbing the heat released by the flue gas through the first flue gas-gas heat exchanger, and is heated to about 300 ℃ by absorbing the heat released by the denitrated flue gas through the second flue gas-gas heat exchanger through the cold and hot air duct to become hot air, and the hot air is used as primary air and secondary air and is sent into a boiler hearth for combustion.
The GGH heat exchanger can realize that the high-temperature flue gas before dust removal is used for heating the low-temperature flue gas after dust removal, so that the temperature of the flue gas entering the denitration SCR reactor reaches over 320 ℃ and does not exceed the temperature of the high-temperature flue gas, the flue gas reaches the proper temperature of a medium-temperature and high-temperature denitration SCR process, and the over-temperature sintering of the catalyst can be effectively prevented. The denitration temperature that can require to reach according to operating condition sets up reasonable arrangement position and structural style. Because the GGH heat exchanger is arranged in front of the denitration SCR reactor, ABS problem can be not considered, the conventional design (total height of heat transfer elements is reduced) is adopted, the manufacturing cost can be saved, the unilateral resistance is reduced by 150-200Pa, the operation pressure is stable, the differential pressure is small, and the periodic fluctuation of the negative pressure of a hearth and the surging of a fan can be prevented. And the heat exchange of cold air is avoided, the air leakage loss is reduced by about 0.8-1.5%, the whole smoke volume is reduced under the same temperature and pressure conditions, the smoke volume processed by the corresponding smoke processing device is reduced, the size is smaller, and the occupied area and the investment are reduced.
The first flue gas-gas heat exchanger can continuously heat cold air at about 20 ℃ by using the flue gas heat at about 145 ℃ after being cooled by the high-temperature channel of the GGH heat exchanger, the flue gas is cooled to about 120 ℃, the cold air at about 20 ℃ is preheated to about 55 ℃, and the cold air flows to the second flue gas-gas heat exchanger through the cold and hot air channel to be further heated.
The low-temperature dust remover can realize high-efficiency dust removal, reduce the dust concentration in the flue gas entering the denitration SCR reactor, reduce the influence of the fly ash on the fly ash scouring, blocking or poisoning of the catalyst, and prolong the service life of the catalyst. The low-temperature dust remover is reliably arranged below or near the boiler tail flue, is compactly arranged, shortens the length of the flue, reduces the resistance and reduces the manufacturing cost.
The draught fan can realize stabilizing furnace negative pressure, provide the effect of draught fan back flue gas flow power, what GGH low temperature side passageway flowed in is draught fan export malleation dust removal back flue gas, what GGH high temperature side passageway flowed in is draught fan entry negative pressure dust removal front flue gas, so low temperature dust removal back flue gas pressure is greater than high temperature dust removal front flue gas pressure, can prevent that the dust removal front flue gas from carrying the dust to the dust removal back flue gas side leakage, influence dust emission concentration.
The flue gas temperature control dust removal device can realize the flue gas preheating or overtemperature prevention effect before the boiler unit is started, and can temporarily heat by using the flue gas temperature control device during the period from the ignition of the boiler to the flue gas temperature reaching the denitration proper temperature, so that the full-working-condition denitration is realized; when the temperature of the flue gas entering the denitration SCR reactor is too high, the temperature can be reduced, so that the high-temperature sintering of the catalyst is prevented; when the GGH heat exchanger uses a rotary heat exchanger, the dust in the channel is carried, and when the carrying amount is too large to influence the dust emission concentration, the dust can be removed for the second time by using the dust removal device, so that the standard exceeding emission is avoided.
The denitration SCR reactor can realize high-efficiency NOx removal, the arrangement position can be reasonably selected according to the site space, the flow field can be optimized, the flue gas temperature is appropriate, high-concentration dust is avoided, the catalyst is good in use environment, the selective catalytic reduction reaction can be carried out with high activity and high efficiency, NOx removal is carried out, the ammonia nitrogen molar ratio can be close to a theoretical value, and the ammonia consumption and the ammonia escape are reduced.
The second flue gas-gas heat exchanger can continuously heat the preheated cold air at about 55 ℃ by utilizing the heat of the flue gas at about 320 ℃ at the outlet of the denitration SCR reactor, the temperature of the flue gas is reduced to about 85 ℃, the preheated cold air at about 55 ℃ is heated to about 300 ℃, and the flue gas is fed into the hearth. Because the air volume and the air temperature of the preheated cold air are adjustable, the flue gas temperature of the outlet flue of the denitration SCR is adjustable and controllable, so that the flue gas temperature of the desulfurization inlet is reduced, the flue gas volume is reduced, the flow rate is reduced, and the manufacturing cost of a desulfurization device is reduced; because the temperature of the flue gas at the desulfurization inlet is low and can be adjusted to be low, the temperature of the flue gas discharged into the atmosphere can be reduced, and the double effects of water lifting and whitening removal are achieved.
Claims (8)
1. The utility model provides a boiler flue gas administers environmental protection equipment in coordination which characterized in that: the boiler flue gas cooperative treatment environmental protection equipment comprises a boiler flue gas outlet flue, a GGH heat exchanger which is divided into a high-temperature side channel, a low-temperature side channel, a first flue of a flue-gas heat exchanger, a flue before dust removal, a low-temperature dust remover, a flue after dust removal, an induced draft fan, a denitration SCR inlet flue, a flue gas temperature control dust removal device, an NH (NH) device3The device comprises an injection uniform distribution device, a denitration SCR reactor, a smoke-gas heat exchanger II, a denitration SCR outlet flue, a desulfurization inlet flue, a desulfurization device, a desulfurization outlet flue and a chimney; wherein: boiler flue gas enters a high-temperature side channel of the GGH heat exchanger through a smoke exhaust outlet flue and then enters a dust removal front flue through a first flue gas-gas heat exchanger, the dust removal front flue is connected with a low-temperature dust remover, and the flue gas flows into a dust removal front flue after being subjected to dust removal through the low-temperature dust removerThe flue after dust enters an induced draft fan for pressurization, then enters a low-temperature side channel of the GGH heat exchanger for heat exchange and temperature rise with the high-temperature side channel of the GGH heat exchanger, the low-temperature side channel of the GGH heat exchanger is connected with a denitration SCR reactor, the flue gas of the low-temperature side channel of the GGH heat exchanger flows out to enter a denitration SCR inlet flue, and the denitration SCR inlet flue, a flue gas temperature control and dust removal device and NH are connected with the denitration SCR3The injection uniform distribution device is communicated with the denitration SCR reactor, the denitration SCR reactor is connected with the second smoke-gas heat exchanger, the denitration SCR outlet flue and the desulfurization inlet flue, the desulfurization inlet flue is connected with the desulfurization outlet flue through the desulfurization device, and the desulfurization outlet flue is connected with the chimney.
2. The boiler flue gas cooperative treatment environmental protection equipment according to claim 1, characterized in that: the GGH heat exchanger is divided into a high-temperature side channel and a low-temperature side channel and can be a 2, 4 or multi-bin rotary heat exchange device.
3. The boiler flue gas cooperative treatment environmental protection equipment according to claim 1, characterized in that: the first flue gas-gas heat exchanger can be composed of a partial water pipeline, a flue gas channel and a cold air duct in the grading economizer.
4. The boiler flue gas cooperative treatment environmental protection equipment according to claim 1, characterized in that: the low-temperature dust collector can be an electrostatic dust collector, a bag type dust collector or an electric-bag composite dust collector.
5. The boiler flue gas cooperative treatment environmental protection equipment according to claim 1, characterized in that: the boiler flue gas cooperative treatment environmental protection equipment comprises an induced draft fan, and the induced draft fan can be in an induced-increased integrated mode or an induced-increased independent combined mode.
6. The boiler flue gas cooperative treatment environmental protection equipment according to claim 1, characterized in that: the flue gas temperature control dust removing device is a cooler with a flue gas cooling function of a clean hot air generator with a flue gas temperature increasing function, wherein the dust removing device is a high-temperature dust remover, a cloth bag dust remover orCyclone type; the NH3The spraying and uniform distribution device is a turbulence generator or a nozzle grid plus a rectifier.
7. The boiler flue gas cooperative treatment environmental protection equipment according to claim 1, characterized in that: the denitration SCR reactor is a device for removing NOx by using a selective catalytic reduction method and comprises a guide plate, a rectifying grid, a catalyst and a soot blower; the desulfurization device is a wet desulfurization system device and comprises an absorption tower, a slurry supply system, a slurry circulating system, an oxidation system and the like.
8. The treatment process of the boiler flue gas cooperative treatment environmental protection equipment according to the claim 1, characterized in that: the treatment process of the boiler flue gas synergistic treatment environmental protection equipment is characterized in that boiler flue gas enters a high-temperature side channel of a GGH heat exchanger through a smoke exhaust outlet flue and then enters a dust removal front flue through a flue-gas heat exchanger, the dust removal front flue is connected with a low-temperature dust remover, the boiler flue gas flows into a dust removal rear flue after being removed dust through the low-temperature dust remover and then enters an induced draft fan for pressurization, then the boiler flue gas enters a low-temperature side channel of the GGH heat exchanger to exchange heat with flue gas in the high-temperature side channel of the GGH heat exchanger for warming, the low-temperature side channel of the GGH heat exchanger is connected with a denitration SCR reactor, the flue gas of the low3And the spraying uniform distribution device enters a denitration SCR reactor for denitration, the denitrated flue gas passes through a flue gas-gas heat exchanger II, the heat exchange and temperature reduction flow enters a desulfurization device through an SCR outlet flue and a desulfurization inlet flue, and finally, the purified flue gas is discharged into the atmosphere through a desulfurization outlet flue and a chimney.
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