CN104180381A - System and method for desulfurization cooling efficiency improvement and waste heat recovery - Google Patents
System and method for desulfurization cooling efficiency improvement and waste heat recovery Download PDFInfo
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Abstract
The invention discloses a system and a method for desulfurization cooling efficiency improvement and waste heat recovery. For different desulfurization system forms of a single-tower single-circulation form, a single-tower double-circulation form, a double-tower double-circulation form and the like, realization modes are different, however an integral desulfurizing tower, a matching system, a slurry heat exchange system, a multi-stage waste heat utilization system and the like are included. Temperature of desulfurization slurry is lowered by means of heat exchange, so that solubility of SO2 and absorbent CaCO3 in liquid phase is improved effectively, the mass transfer rate is increased, further desulfurization efficiency is improved effectively and reaches above 99%, and ultra-clean emission of flue gas SO2 is realized; meanwhile, recovered waste heat is subjected to multistage utilization, so that efficiency of heat utilization of an entire thermodynamic system is improved effectively, operating cost is lowered on the whole, and high efficiency, energy conservation and emission reduction of the thermodynamic system are realized.
Description
Technical field
The invention belongs to industrial waste gas purifying environmental protection and energy field, be specifically related to coal fired power plant flue gas desulfurization device, particularly the system and method for a kind of desulfurization cooling synergy and heat recovery.
Background technology
Coal-burning power plant is using coal as the energy, and coal combustion produces a large amount of SO in process of production
2, for controlling SO
2realize SO
2qualified discharge, coal-burning power plant generally adopts Gypsum Wet technology to carry out flue gas desulfurization.
Wet desulfurization of flue gas by limestone-gypsum method technology adopts cheap lime stone as desulfurization absorbent, and lime stone is made absorption slurries through crushing grinding powdering and water mix and blend; Then in desulfurizing tower, absorb slurries and contact with flue gas adverse current, the SO in flue gas
2with the CaCO in slurries
3reaction removes SO
2, desulfurization product reacts with the oxidation air passing in desulfurizing tower bottom, finally generates gypsum by-product; Flue gas after desulfurization is removed droplet through demister successively, after flue gas heat-exchange unit heat temperature raising through smoke stack emission.Wet desulfurization of flue gas by limestone-gypsum method technology has that reaction speed is fast, desulfuration efficiency is high, the advantages such as recycling are convenient in stable and reliable operation, byproduct, and therefore coal-burning power plant is used widely at home.
The whole process of wet desulfurization of flue gas by limestone-gypsum method is that a flue gas enthalpy remains unchanged substantially, water capacity constantly increases until the process that wet flue gas is saturation state in flue gas, final desulfurizing tower exit gas temperature is down to adiabatic saturation temperature, and slurry temperature is also corresponding is down to same temperature range.In sweetening process, slurry temperature has considerable influence to desulfuration efficiency.Slurry temperature is lower, SO
2with CaCO
3solubility in slurries is larger, and overall mass transfer coefficient is also larger, can effectively improve desulfuration efficiency.No matter but current wet desulfurization of flue gas by limestone-gypsum method adopts single cycle or two circulation form, its desulfurizing tower exit gas temperature is all between 45 DEG C～55 DEG C, corresponding slurry temperature is also between 45 DEG C～55 DEG C, and existing wet desulfurization of flue gas by limestone-gypsum method device does not all take appropriate measures and reduces slurry temperature further to improve desulfuration efficiency.
The dynamics of carrying out " energy-saving and environmental protection " state basic policy along with country is increasing, to the SO of thermal power plant
2discharge Deng pollutant is had higher requirement, corresponding requirements SO
2absorption techniques should have higher efficiency.Improve desulfuration efficiency simultaneously to heat recovery by reducing slurry temperature, meet the increasingly strict energy-saving and emission-reduction requirement of country, there is important application value.
Chinese patent CN1727296A discloses a kind of wet desulfurization of flue gas by limestone-gypsum method device, belongs to the flue gas desulfur device of station boiler, Industrial Boiler or kiln, solves the little problem of lime stone solubility existing in existing flue gas desulfur device.The present invention includes air-introduced machine, flue gas heat-exchange unit, absorption tower, slurry circulating pump, oxidation pond, oxidation fan, limestone slurry flow container, limestone slurry liquid pump, limestone powder bin, gypsum excavationg pump, gypsum cyclone, belt dewaterer, filtrate water box and filtrate water pump.The high concentration CO that the present invention produces by oxygen-enriched combusting
2flue gas activates lime stone slurry, and lime stone slurry rate of dissolution is accelerated, and solubility increases, and desulfuration efficiency improves.But the present invention is because needs are by high concentration CO
2improve lime stone solubility, be only applicable to oxygen-enriched combustion system, under conventional coal-fired plant flue gas atmosphere, cannot apply, and only improve desulfuration efficiency by improving lime stone solubility, act on limited.In addition, the present invention does not relate to the recycling of waste heat yet.
Summary of the invention
The system and method that the object of this invention is to provide a kind of desulfurization cooling synergy and heat recovery, reduces desulfurization slurry temperature by heat exchange, thereby effectively improves SO
2with absorbent CaCO
3solubility in liquid phase, improves mass transfer rate, and then effectively improves desulfuration efficiency (desulfuration efficiency is more than 99%), realizes flue gas SO
2ultra-clean discharge, by carrying out multistage utilization after waste heat recovery, effectively improve the heat utilization efficiency of whole therrmodynamic system simultaneously, reduce on the whole operating cost, realize the efficient energy-saving and emission-reducing of therrmodynamic system.
To achieve these goals, the present invention adopts following technical scheme:
The system of a kind of desulfurization cooling synergy and heat recovery, described system is single tower single cycle wet process of FGD cooling synergy and waste heat recycling system, comprise desulfurizing tower, wet-type electrostatic defroster, smoke re-heater, chimney, circulation slurry pump, heat exchanger, the cool slurry circulating pump circulation slurry pump of desulfurizing tower (or directly utilize), evaporimeter, compressor, condenser, heating system, fuel stem drying system, inlet air of boiler heating system, described desulfurizing tower arranges circulation slurry pump, wet-type electrostatic defroster is passed through in the outlet of described desulfurizing tower successively, smoke re-heater is connected with chimney, described smoke re-heater is connected with condenser, described condenser also respectively with described heating system, fuel stem drying system, inlet air of boiler heating system connects, described condenser is connected with evaporimeter by compressor, described evaporimeter is connected with desulfurizing tower by heat exchanger.
Desulfurization cooling synergy based on said system and the method for heat recovery, SO is carried out in flue gas effect by circulation slurry pump in desulfurizing tower that boiler is discharged
2purified treatment, the flue gas the purification of discharging from desulfurizing tower passes through the demist of wet-type electrostatic defroster successively, and after the heat effect of smoke re-heater, by smoke stack emission.The slurries that temperature is higher in desulfurizing tower first under the effect of the cool slurry circulating pump circulation slurry pump of desulfurizing tower (or directly utilize) by heat exchanger heat exchange, the heat after heat exchange is passed to smoke re-heater, heating system, fuel stem drying system, inlet air of boiler heating system through the heat pump being made up of evaporimeter, compressor, condenser by heat successively.
In described desulfurizing tower, the pH value of slurries is 4-5.5, and heat exchange rear slurry temperature is 25 DEG C-35 DEG C.
A system for desulfurization cooling synergy and heat recovery, described system is the two circulation wet process of FGD cooling synergy of single tower and waste heat recycling system, comprises desulfurizing tower, wet-type electrostatic defroster, smoke re-heater, chimney, circulation slurry pump, heat exchanger, the cool slurry circulating pump circulation slurry pump of desulfurizing tower self (or directly utilize), evaporimeter, compressor, condenser, heating system, fuel stem drying system, inlet air of boiler heating system, upper spraying layer, liquid receptacle, lower spraying layer, serum pot, described desulfurizing tower arranges circulation slurry pump, and in described desulfurizing tower, cloth deposits spraying layer successively from bottom to top, liquid receptacle, upper spraying layer, described liquid receptacle is connected with serum pot, and wet-type electrostatic defroster is passed through in the outlet of described desulfurizing tower successively, smoke re-heater is connected with chimney, and described smoke re-heater is connected with condenser, described condenser also respectively with described heating system, fuel stem drying system, inlet air of boiler heating system connects, and described condenser is connected with evaporimeter by compressor, and described evaporimeter is connected with desulfurizing tower by heat exchanger.
Desulfurization cooling synergy based on said system and the method for heat recovery, the flue gas that boiler is discharged carries out SO by the effect of circulation slurry pump and lower spraying layer in desulfurizing tower
2preliminary purification processing, flue gas after preliminary purification carries out deep purifying processing through upper spraying layer, the slurries of upper spraying layer ejection are collected and are entered serum pot by liquid receptacle, the gas of discharging from desulfurizing tower passes through the demist of wet-type electrostatic defroster successively, after the heat effect of smoke re-heater, by smoke stack emission.The slurries that temperature is higher in high pH value serum pot are by heat exchanger heat exchange under the effect of the cool slurry circulating pump circulation slurry pump of desulfurizing tower self (or directly utilize), and the heat after heat exchange is passed to smoke re-heater, heating system, fuel stem drying system, inlet air of boiler heating system through the heat pump being made up of evaporimeter, compressor, condenser by heat successively.Along with the balance of heat, the low pH value slurry temperature in final desulfurizing tower bottom also declines gradually.
The pH value of described desulfurizing tower inner bottom part slurries is 4-5.5, and stable rear slurry temperature is 35 DEG C-45 DEG C; Slurry pH value in described serum pot is 5.8-6.5, and heat exchange rear slurry temperature is 25 DEG C-35 DEG C.
A system for desulfurization cooling synergy and heat recovery, described device is the two circulation wet process of FGD desulfurization cooling synergy of double tower and waste heat recycling system, comprises front desulfurizing tower, rear desulfurizing tower, wet-type electrostatic defroster, smoke re-heater, chimney, circulation slurry pump, heat exchanger, cool slurry circulating pump (or directly utilizing desulfurizing tower circulation slurry pump), evaporimeter, compressor, condenser, heating system, fuel stem drying system, inlet air of boiler heating system, described front desulfurizing tower is connected with rear desulfurizing tower by outlet flue, described front desulfurizing tower, rear desulfurizing tower arranges circulation slurry pump, and wet-type electrostatic defroster is passed through in the outlet of described rear desulfurizing tower successively, after smoke re-heater, be connected with chimney, described smoke re-heater is connected with condenser, described condenser also respectively with described heating system, fuel stem drying system, inlet air of boiler heating system connect, described condenser is connected with evaporimeter by compressor, described evaporimeter through heat exchanger with after desulfurizing tower be connected.
Desulfurization cooling synergy based on said system and the method for heat recovery, the flue gas that boiler is discharged carries out SO in front desulfurizing tower
2preliminary purification processing, enter afterwards the deep purifying that rear desulfurizing tower carries out flue gas, the gas of discharging from rear desulfurizing tower passes through wet-type electrostatic defroster demist successively, after smoke re-heater heating, by smoke stack emission, the slurries that in rear desulfurizing tower, temperature is higher pass through heat exchanger heat exchange under the effect of cool slurry circulating pump (or directly utilizing desulfurizing tower circulation slurry pump), heat after heat exchange passes through successively by evaporimeter, compressor, heat is passed to smoke re-heater by the heat pump of condenser composition, heating system, fuel stem drying system, inlet air of boiler heating system.
In described front desulfurizing tower, the pH value of slurries is 4-5.5, and slurry temperature is 45 DEG C-55 DEG C; Slurry pH value in described rear desulfurizing tower is 5.8-6.5, and heat exchange rear slurry temperature is at 25 DEG C-35 DEG C.
The system of above-mentioned desulfurization cooling synergy and heat recovery, the reduction of desulfurization slurry temperature, is that the heat pump heat exchanging by being made up of evaporimeter, compressor, condenser etc. is realized, and adopts compression heat pump or absorption heat pump to carry out heat exchange.
Beneficial effect of the present invention:
1, the heat that utilization of the present invention is obtained from slurries carries out heat again to the flue gas after purifying, effectively solve the chimney etching problem that flue gas with water causes, all the other heats are dry etc. for the heating of heat supply, inlet air of boiler and as-fired fuel, by the multistage utilization of heat, realize the maximization of energy saving of system.
2, the present invention reduces the temperature of desulfurization slurry by heat exchange, and the temperature that makes slurries is reduced to 25 DEG C-35 DEG C from 45 DEG C-55 DEG C, thereby effectively improves SO
2with absorbent CaCO
3solubility in liquid phase, improves mass transfer rate, and then effectively improves desulfuration efficiency (desulfuration efficiency is more than 99%), realizes flue gas SO
2ultra-clean discharge by carrying out multistage utilization after waste heat recovery, effectively improves the heat utilization efficiency of whole therrmodynamic system simultaneously, effectively reduces on the whole operating cost, realizes the efficient energy-saving and emission-reducing of therrmodynamic system.
3, the present invention is based on conventional Wet Flue Gas Desulfurization Technology, further improve desulfuration efficiency by reducing slurry temperature, and energy-efficient by the multistage utilization of waste heat is realized, realizing coal-fired flue-gas SO
2the operating cost that effectively reduces whole system when ultra-clean discharge, has broad application prospects.
Brief description of the drawings
Fig. 1 is single tower single cycle wet process of FGD cooling synergy and bootstrap system schematic diagram;
Fig. 2 is the two circulation wet process of FGD cooling synergy of single tower and bootstrap system schematic diagram;
Fig. 3 is the two circulation wet process of FGD cooling synergy of double tower and bootstrap system schematic diagram;
Wherein, 1, desulfurizing tower, 1-1, front desulfurizing tower, 1-2, rear desulfurizing tower, 2, wet-type electrostatic defroster, 3, smoke re-heater, 4, chimney, 5, circulation slurry pump, 6, heat exchanger, 7, cool slurry circulating pump (optional), 8, evaporimeter, 9, compressor, 10, condenser, 11, heating system, 12, fuel stem drying system, 13, inlet air of boiler heating system, 14, upper spraying layer, 15, liquid receptacle, 16, lower spraying layer, 17, serum pot.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Embodiment 1
As shown in Figure 1, the system of a kind of desulfurization cooling synergy and heat recovery, described system is single tower single cycle wet process of FGD cooling synergy and waste heat recycling system, comprises desulfurizing tower 1, wet-type electrostatic defroster 2, smoke re-heater 3, chimney 4, circulation slurry pump 5, heat exchanger 6, cool slurry circulating pump 7, evaporimeter 8, compressor 9, condenser 10, heating system 11, fuel stem drying system 12, inlet air of boiler heating system 13, described desulfurizing tower 1 arranges circulation slurry pump 5, and the pH value of described desulfurizing tower 1 interior slurries is 5-5.5, and the outlet of described desulfurizing tower 1 is successively by wet-type electrostatic defroster 2, smoke re-heater 3 is connected with chimney 4, and described smoke re-heater 3 is connected with condenser 10, described condenser 10 also respectively with described heating system 11, fuel stem drying system 12, inlet air of boiler heating system 13 connects, and described condenser 10 is connected with evaporimeter 8 by compressor 9, and described evaporimeter 8 passes through heat exchanger 6 successively, cool slurry circulating pump 7 or be directly connected with desulfurizing tower 1 by desulfurizing tower circulation slurry pump 5.
Desulfurization cooling synergy based on said system and the method for heat recovery, SO is carried out in flue gas effect by recycle liquid pump 5 in desulfurizing tower 1 that boiler is discharged
2purified treatment, the flue gas of discharging from desulfurizing tower 1 passes through the demist of wet-type electrostatic defroster 2 successively, heat effect with smoke re-heater 3, discharge by chimney 4, the higher slurries of the interior temperature of desulfurizing tower 1 by cool slurry circulating pump 7 or directly utilize desulfurizing tower circulation slurry pump act on heat exchanger 6 heat exchange, heat after heat exchange is passed to smoke re-heater 3, heating system 11, fuel stem drying system 12, inlet air of boiler heating system 13 through evaporimeter 8, compressor 9, condenser 10 by heat successively, and heat exchange rear slurry temperature is 25 DEG C-35 DEG C.
Embodiment 2
As shown in Figure 2, the system of a kind of desulfurization cooling synergy and heat recovery, described system is the two circulation wet process of FGD cooling synergy of single tower and waste heat recycling system, comprises desulfurizing tower 1, wet-type electrostatic defroster 2, smoke re-heater 3, chimney 4, circulation slurry pump 5, heat exchanger 6, cool slurry circulating pump 7, evaporimeter 8, compressor 9, condenser 10, heating system 11, fuel stem drying system 12, inlet air of boiler heating system 13, upper spraying layer 14, liquid receptacle 15, lower spraying layer 16, serum pot 17, the pH value of described desulfurizing tower 1 interior slurries is 4-5.5, and stable rear slurry temperature is 35 DEG C-45 DEG C, and described desulfurizing tower 1 arranges circulation slurry pump 5, and in described desulfurizing tower 1, cloth deposits spraying layer 16 successively from bottom to top, liquid receptacle 15, upper spraying layer 14, described liquid receptacle 15 is connected with serum pot 17, and the outlet of described desulfurizing tower 1 is successively by wet-type electrostatic defroster 2, smoke re-heater 3 is connected with chimney 4, and described smoke re-heater 3 is connected with condenser 10, described condenser 10 also respectively with described heating system 11, fuel stem drying system 12, inlet air of boiler heating system connects 13, and described condenser 10 is connected with evaporimeter 8 by compressor 9, and described evaporimeter 8 passes through heat exchanger 6 successively, cool slurry circulating pump 7 or be directly connected with serum pot 17 by desulfurizing tower circulation slurry pump.
Desulfurization cooling synergy based on said system and the method for heat recovery, the flue gas that boiler is discharged carries out SO by the effect of circulation slurry pump 5 and lower spraying layer 16 in desulfurizing tower
2preliminary purification processing, flue gas after preliminary purification carries out deep purifying processing through upper spraying layer 13, the slurries that upper spraying layer 13 sprays are collected and are entered serum pot 17 by liquid receptacle 15, the flue gas of discharging from desulfurizing tower passes through the demist of wet-type electrostatic defroster 2 successively, the heat effect of smoke re-heater 3, discharge by chimney 4, the higher slurries of the interior temperature of serum pot 17 by cool slurry circulating pump 7 or directly utilize desulfurizing tower circulation slurry pump 5 act on heat exchanger 6 heat exchange, heat after heat exchange passes through evaporimeter 8 successively, compressor 9, heat is passed to smoke re-heater 3 by condenser 10, heating system 11, fuel stem drying system 12, inlet air of boiler heating system 13, slurry pH value in described serum pot is 5.8-6.5, heat exchange rear slurry temperature is between 25 DEG C-35 DEG C.Slurry pH value in the stock tank of described desulfurizing tower bottom is between 4-5.5, and along with the balance of heat, the slurry temperature in the stock tank of bottom drops between 35 DEG C-45 DEG C gradually.
Embodiment 3
As shown in Figure 3, the system of a kind of desulfurization cooling synergy and heat recovery, described device is the two circulation wet process of FGD cooling synergy of double tower and waste heat recycling system, comprises front desulfurizing tower 1-1, rear desulfurizing tower 1-2, wet-type electrostatic defroster 2, smoke re-heater 3, chimney 4, circulation slurry pump 5, heat exchanger 6, cool slurry circulating pump 7, evaporimeter 8, compressor 9, condenser 10, heating system 11, fuel stem drying system 12, inlet air of boiler heating system 13, described front desulfurizing tower 1-1 is connected with rear desulfurizing tower 1-2 by outlet flue, described front desulfurizing tower 1-1, rear desulfurizing tower 1-2 all arranges circulation slurry pump 5, and the gas outlet of described rear desulfurizing tower 1-2 is successively by wet-type electrostatic defroster 2, smoke re-heater 3 is connected with chimney 4, and described smoke re-heater 3 is connected with condenser 10, described condenser 10 also respectively with described heating system 11, fuel stem drying system 12, inlet air of boiler heating system 13 connects, and described condenser 10 is connected with evaporimeter 8 by compressor 9, and described evaporimeter 8 passes through heat exchanger 6 successively, cool slurry circulating pump 7 or be directly connected with rear desulfurizing tower 1-2 by desulfurizing tower circulation slurry pump 5.
Desulfurization cooling synergy based on said system and the method for heat recovery, the flue gas that boiler is discharged carries out SO in front desulfurizing tower 1-1
2preliminary purification processing, enter afterwards the deep purifying that rear desulfurizing tower 1-2 carries out flue gas, the gas of discharging from rear desulfurizing tower 1-2 passes through wet-type electrostatic defroster 2 demists successively, after smoke re-heater 3 heating, discharge by chimney 4, the slurries that temperature is higher in rear desulfurizing tower 1-2 by cool slurry circulating pump 7 or directly utilize desulfurizing tower circulation slurry pump 5 act on heat exchanger 6 heat exchange, heat after heat exchange passes through evaporimeter 8 successively, compressor 9, heat is passed to smoke re-heater 3 by condenser 10, heating system 11, fuel stem drying system 12, inlet air of boiler heating system 13, after after heat exchange in desulfurizing tower slurry temperature at 25 DEG C～35 DEG C, pH value is 5.8-6.5.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection scope of the present invention.
Claims (9)
1. the system of desulfurization cooling synergy and heat recovery, it is characterized in that, described system is single tower single cycle wet process of FGD cooling synergy and waste heat recycling system, comprise desulfurizing tower, wet-type electrostatic defroster, smoke re-heater, chimney, circulation slurry pump, heat exchanger, cool slurry circulating pump or directly utilize desulfurizing tower circulation slurry pump, evaporimeter, compressor, condenser, heating system, fuel stem drying system, inlet air of boiler heating system, described desulfurizing tower arranges circulation slurry pump, wet-type electrostatic defroster is passed through in the outlet of described desulfurizing tower successively, smoke re-heater is connected with chimney, described smoke re-heater is connected with condenser, described condenser also respectively with described heating system, fuel stem drying system, inlet air of boiler heating system connects, described condenser is connected with evaporimeter by compressor, described evaporimeter passes through heat exchanger successively, cool slurry circulating pump or directly utilize desulfurizing tower circulation slurry pump to be connected with desulfurizing tower.
2. the method based on system desulfurization cooling synergy claimed in claim 1 and heat recovery, is characterized in that, SO is carried out in flue gas effect by circulation slurry pump in desulfurizing tower that described boiler is discharged
2purified treatment, the flue gas of discharging from desulfurizing tower passes through the demist of wet-type electrostatic defroster successively, after the heat effect of smoke re-heater, by smoke stack emission, the slurries that temperature is higher in desulfurizing tower are first at cool slurry circulating pump or directly utilize under the effect of circulation slurry pump of desulfurizing tower by heat exchanger heat exchange, and the heat after heat exchange is successively through passing to smoke re-heater, heating system, fuel stem drying system, inlet air of boiler heating system by evaporimeter, compressor, condenser by heat.
3. method as claimed in claim 2, is characterized in that, in described desulfurizing tower, slurry pH value is 4-5.5, and the slurry temperature after heat exchange is between 25 DEG C-35 DEG C.
4. a system for desulfurization cooling synergy and heat recovery, is characterized in that, described system is the two circulation wet process of FGD cooling synergy of single tower and waste heat recycling system, comprises desulfurizing tower, wet-type electrostatic defroster, smoke re-heater, chimney, circulation slurry pump, heat exchanger, cool slurry circulating pump, evaporimeter, compressor, condenser, heating system, fuel stem drying system, inlet air of boiler heating system, upper spraying layer, liquid receptacle, lower spraying layer, serum pot, described desulfurizing tower arranges circulation slurry pump, and in described desulfurizing tower, cloth deposits spraying layer successively from bottom to top, liquid receptacle, upper spraying layer, described liquid receptacle is connected with serum pot, and wet-type electrostatic defroster is passed through in the outlet of described desulfurizing tower successively, smoke re-heater is connected with chimney, and described smoke re-heater is connected with condenser, described condenser also respectively with described heating system, fuel stem drying system, inlet air of boiler heating system connects, and described condenser is connected with evaporimeter by compressor, and described evaporimeter passes through heat exchanger successively, cool slurry circulating pump or be connected with serum pot by desulfurizing tower circulation slurry pump.
5. the method based on system desulfurization cooling synergy claimed in claim 4 and heat recovery, is characterized in that, the flue gas that described boiler is discharged carries out SO by the effect of circulation slurry pump and lower spraying layer in desulfurizing tower
2preliminary purification processing, flue gas after preliminary purification carries out deep purifying processing through upper spraying layer, the slurries of upper spraying layer ejection are collected and are entered serum pot by liquid receptacle, the gas of discharging from desulfurizing tower passes through the demist of wet-type electrostatic defroster successively, after the heat effect of smoke re-heater, by smoke stack emission, the slurries that temperature is higher in serum pot are at cool slurry circulating pump or directly utilize under the effect of circulation slurry pump of desulfurizing tower self by heat exchanger heat exchange, heat after heat exchange passes through successively by evaporimeter, compressor, heat is passed to smoke re-heater by condenser, heating system, fuel stem drying system, inlet air of boiler heating system.
6. method as claimed in claim 5, is characterized in that, in described serum pot, slurry pH value is 5.8-6.5, and the temperature after slurries heat exchange is between 25 DEG C-35 DEG C; In described desulfurizing tower, the pH value of slurries is 4-5.5, and stable rear slurry temperature is 35 DEG C-45 DEG C.
7. a system for desulfurization cooling synergy and heat recovery, is characterized in that, described device is the two circulation wet process of FGD cooling synergy of double tower and waste heat recycling system, comprises front desulfurizing tower, rear desulfurizing tower, wet-type electrostatic defroster, smoke re-heater, chimney, circulation slurry pump, heat exchanger, cool slurry circulating pump, evaporimeter, compressor, condenser, heating system, fuel stem drying system, inlet air of boiler heating system, described front desulfurizing tower outlet is connected with rear desulfurizing tower, and described desulfurizing tower arranges circulation slurry pump, and the gas outlet of described rear desulfurizing tower is passed through wet-type electrostatic defroster successively, smoke re-heater is connected with chimney, and described smoke re-heater is connected with condenser, described condenser also respectively with described heating system, fuel stem drying system, inlet air of boiler heating system connects, and described condenser is connected with evaporimeter by compressor, and described evaporimeter passes through heat exchanger successively, cool slurry circulating pump or be connected with rear desulfurizing tower by desulfurizing tower circulation slurry pump.
8. the method based on system desulfurization cooling synergy claimed in claim 7 and heat recovery, is characterized in that, the flue gas that described boiler is discharged carries out SO in front desulfurizing tower
2preliminary purification processing, enter afterwards the deep purifying that rear desulfurizing tower carries out flue gas, the gas of discharging from rear desulfurizing tower passes through wet-type electrostatic defroster demist successively, after smoke re-heater heating, by smoke stack emission, the slurries that temperature is higher in rear desulfurizing tower are at cool slurry circulating pump or directly utilize under the effect of desulfurizing tower circulation slurry pump by heat exchanger heat exchange, and the heat after heat exchange is passed to smoke re-heater, heating system, fuel stem drying system, inlet air of boiler heating system through the heat pump being made up of evaporimeter, compressor, condenser by heat successively.
9. method as claimed in claim 8, is characterized in that, in described front desulfurizing tower, the pH value of slurries is 4-5.5, and slurry temperature is 45 DEG C-55 DEG C; Slurry pH value in described rear desulfurizing tower is 5.8-6.5, and slurry temperature is between 25 DEG C-35 DEG C.
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| CN107166418A (en) * | 2017-07-07 | 2017-09-15 | 北京生态经济科技有限公司 | A kind of smoke processing system that drop mist is dehydrated for power plant desulfurization |
| CN107519757A (en) * | 2017-10-17 | 2017-12-29 | 华北电力大学 | A kind of unpowered cooling cigarette tower apparatus of wet flue gas |
| CN108014578A (en) * | 2018-01-05 | 2018-05-11 | 山东大学 | The method and device of fine grained and condensable particle in low temperature spray cleaning coal-fired flue-gas |
| CN110513670A (en) * | 2018-05-21 | 2019-11-29 | 李季 | A kind of eliminating white smoke system |
| CN108704464A (en) * | 2018-07-25 | 2018-10-26 | 北京京诚科林环保科技有限公司 | Sintering flue gas desulfurization and denitrification and flue gas whitening comprehensive treatment system and process |
| CN108704463A (en) * | 2018-07-25 | 2018-10-26 | 北京京诚科林环保科技有限公司 | Sintering flue gas desulfurization and denitrification and flue gas whitening comprehensive treatment system and process |
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| CN109432935B (en) * | 2018-11-01 | 2021-04-27 | 中石化炼化工程（集团）股份有限公司 | System for deeply eliminating white smoke of wet desulphurization flue gas |
| CN109289489A (en) * | 2018-11-05 | 2019-02-01 | 李申强 | Coal steam-electric plant smoke processing unit |
| CN110006063A (en) * | 2019-04-02 | 2019-07-12 | 双良节能系统股份有限公司 | A kind of fire coal boiler fume waste heat deep exploitation system with desulfurizing tower |
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| CN116785905A (en) * | 2023-03-10 | 2023-09-22 | 哈尔滨工业大学 | Carbon capturing system and carbon capturing method by circulating ammonia method |
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