CN108786388A - A kind of removing method of wet type desulfurizing flue gas water mist - Google Patents

A kind of removing method of wet type desulfurizing flue gas water mist Download PDF

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Publication number
CN108786388A
CN108786388A CN201810510751.6A CN201810510751A CN108786388A CN 108786388 A CN108786388 A CN 108786388A CN 201810510751 A CN201810510751 A CN 201810510751A CN 108786388 A CN108786388 A CN 108786388A
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China
Prior art keywords
flue gas
air
heat
heat exchanger
transfer
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CN201810510751.6A
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Chinese (zh)
Inventor
张书廷
刘闯
程笑
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Tianjin University
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Tianjin University
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Priority to CN201810510751.6A priority Critical patent/CN108786388A/en
Publication of CN108786388A publication Critical patent/CN108786388A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26Drying gases or vapours
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26Drying gases or vapours
    • B01D53/265Drying gases or vapours by refrigeration (condensation)
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • B01D53/501Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/504Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases

Abstract

The present invention relates to the cooled processes of heat-transfer surface indirect contact heat exchanger that the flue gas of a kind of removing method of wet type desulfurizing flue gas water mist, including wet desulphurization tower gas vent passes through heat exchanger with air first;Condensed water is first discharged in the cooled flue gas of indirect contact heat exchanger, then the hot-air after being heated with heat transfer process mix after from chimney be discharged into Atmospheric processes.The present invention will pass through desulfurizing tower treated flue gas with air in heat exchanger heat-transfer surface indirect contact heat exchanger, flue gas cools after making processing, the white smoke phenomenon for preventing high-temperature flue gas direct emission to be formed, and the residual sulfur without handling completely is absorbed by lye before heat exchange, and then make finally purer with the mixed gas of air dual disposal, increase environmental benefit.The characteristics of present invention has investment cost few, and operation power consumption is small, and method is simple and efficient realizes that energy-saving and emission-reduction synergy provides effective technical guarantee for the removal of the wet desulfurization flue gas water mist in the fields such as smelting and coal-burning power plant.

Description

A kind of removing method of wet type desulfurizing flue gas water mist
Technical field
The present invention relates to a kind of removing methods of wet type desulfurizing flue gas water mist, and especially after wet desulphurization, wet type is de- The flue gas of sulphur tower gas vent is cooled with air indirect contact heat exchanger, from smoke stack emission after product mixing, to each grain size flue gas Water mist has a preferable removal effect, realizes that flue gas after desulfurization water mist quickly, is efficiently eliminated, be suitable for smelting, coal-burning power plant and Field of environment protection.
Background technology
In the fields such as smelting and coal-burning power plant, for desulfurizing item, Limestone-gypsum Wet Flue Gas Desulfurization Process technique is mostly used greatly (WFGD), it is furnished with neat stress reheater after most wet desulphurization tower.About 90% uses rotary generative original cigarette in smoke re-heater Gas/neat stress heat exchanger (GGH).Neat stress is conducive to flue gas diffusion row to improve atmosphere hoist height after can be used for heating desulfurization Put, state normally whether be related to flue gas desulphurization system can normal operation, but the GGH operating costs that come into operation are higher, and Show that GGH easy tos produce stifled grey etching problem by a large amount of practical experience, and then lead to failure, can be influenced when serious The problems such as system safety operation, and its heat exchange efficiency is low, pressure difference is far above design value.Therefore, from after 2006, more than 70% WFGD system cancel or GGH be not set.But after cancelling GGH, neat stress exhaust temperature reduces, and a large amount of fine drops easily occurs Entrainment discharge, and rainfall is formed around chimney, the white solid trace of more difficult cleaning, i.e. " stone can be formed after evaporation of raindrops Cream rain " phenomenon, makes a big impact to resident living.
Therefore, a kind of removing method of effective wet type desulfurizing flue gas water mist is found, generation " gypsum rain " is avoided to ask Topic, quick, efficient, the inexpensive removal of exploration flue gas water mist, seems to the energy conservation and environmental protection synergy in the fields such as smelting and coal-burning power plant It is particularly important.
Invention content
Present invention aims at a kind of removing method of wet type desulfurizing flue gas water mist is provided, especially in limestone-gypsum After wet desulfurizing process (WFGD), the neat stress of the temperature of generation at 40~60 DEG C, moisture is in saturation state in flue gas, leads to It crosses and the flue gas of wet desulphurization tower gas vent is cooled with air by the realization of heat-transfer surface indirect contact heat exchanger, thereafter let out Flue gas after condensed water is mixed with the hot-air after the heating to be discharged from chimney, realizes that flue gas water mist efficiently, is quickly eliminated.With Air after the flue gas indirect heat exchange of wet desulphurization tower gas vent discharge is realized with into the flue gas indirect heat exchange before desulfurizing tower Non- desulfurization fume cooling, prevents dust temperature excessively high, influences desulfurization effect, and realizes that air secondary uses, energy conservation and environmental protection;It is changing The heat-transfer surface of heat exchanger used in heat using metal surface coating acid corrosion-resistant coating material material or high-molecular organic material, Or Titanium is with anticorrosion;The flue gas of wet desulphurization tower gas vent discharge passes through with air between heat-transfer surface again after being contacted with lye Connect that contact heat-exchanging is cooled to reduce its corrosivity to neutralize dilute sulfuric acid in doctor solution;Flue gas after air cooling was through the past Except being mixed with hot-air again after the removal process of water droplet to realize high mixing efficiency.The present invention provides a kind of wet type desulfurizing flue gases The removing method of water mist, and have the characteristics that investment cost is few, equipment is simple, low energy consumption, effectively control flue gas water mist pollution.
The present invention adopts the following technical scheme that realization:
A kind of removing method of wet type desulfurizing flue gas water mist, it is characterized in that being at least made of following process:
(1) the heat-transfer surface indirect contact heat exchanger quilt that the flue gas of wet desulphurization tower gas vent passes through heat exchanger with air first Cooling procedure;
(2) condensed water is first discharged in the cooled flue gas of indirect contact heat exchanger, then mixed with the hot-air after heat transfer process heating After conjunction Atmospheric processes are discharged into from chimney.
To realize that the secondary use of air, indirect contact heat exchanger are cooled after process, the hot-air heated can be with entrance Flue gas indirect heat exchange before desulfurizing tower;
The device of the method, it is characterised in that the above-mentioned heat-transfer surface for exchanging heat heat exchanger used twice uses metal surface, The material or high-molecular organic material or Titanium of coating acid corrosion-resistant coating material.
The method, it is characterized in that the flue gas that wet desulphurization tower gas vent is discharged in (1) is first contacted with lye, then with Air is cooled by heat-transfer surface indirect contact heat exchanger, and the flue gas after condensed water is discharged and the hot-air after heat transfer process heating is mixed After conjunction air is discharged into from chimney.
The method, it is characterised in that first pass through removing for removal water droplet by the flue gas after air cooling in process (2) It is mixed again with hot-air after water process.
It is described as follows:
Limestone-gypsum FGD plant generally use spray void tower structure, gypseous desulfurization slurry by nozzle to Lower ejection, flue gas adverse current are discharged upwards.After wet process of FGD, flue-gas temperature is generally at 40~60 DEG C, in flue gas at moisture In saturation state, which is discharged outward by flue, and the flue other end is passed through pure air, wet desulphurization tower gas vent Flue gas reduces its corrosivity, flue gas continues to flow forward through after base extraction by remaining dilute sulfuric acid in lye Absorption Desulfurization liquid Heat exchanger realizes that heat exchange, the heat-transfer surface are coated with the material of acid corrosion-resistant coating material using metal surface in the heat-transfer surface of heat exchanger Material or high-molecular organic material or Titanium, its partial heat, which is transmitted to heat-transfer surface, makes its accumulation of heat, and air is gone in heat-transfer surface When side, release heat to adverse current by air, realize desulfurizing tower gas vent flue gas cool, indirect heat exchange sky Gas lift temperature, the air after heating are realized Air twotimess, are made non-desulfurization cigarette with into the flue gas indirect heat exchange before desulfurizing tower Gas cools down.Flue gas releases condensed water in heat-transfer surface after condensation, and by removing the removal process of water droplet, the water of discharge passes through lower section The drainpipe of laying is discharged.The air to heat up after flue gas and the heat exchange after discharge condensed water is discharged into after mixing from top chimney Into air.
The high-temperature flue gas indirect contact heat exchanger cooling that the air used in the process is discharged with desulfurizing tower first, makes flue gas cool down Cooling makes non-desulfurization fume cool down then with into the flue gas indirect contact heat exchanger before desulfurizing tower, realizes that air utilizes twice, Energy conservation and environmental protection.
The material of heat-transfer surface should have corrosion resistance, therefore the heat-transfer surface for the heat exchanger used that exchanges heat is applied using metal surface The material or high-molecular organic material or Titanium of cloth acid corrosion-resistant coating material, but it is not limited to these types of material.
By, containing certain incompletely processed sulfur dioxide, being condensed into dilute sulfuric acid in the wet flue gas of wet desulphurization tower, having There is strong corrosivity, its corrosivity is greatly lowered after it is absorbed sulfuric acid therein by lye, therefore can select heat preservation And the high metal material heat-transfer surface of heat transfer efficiency replaces the lower plastic material of heat transfer efficiency.
Flue gas after air setting, wherein contain a large amount of saturated waters, therefore will wherein moisture empty after, be conducive to cigarette The concentration of gas and recovery processing are discharged after then being mixed with hot-air from chimney.
The beneficial effects of the present invention are will pass through desulfurizing tower treated flue gas and air is indirect in heat exchanger heat-transfer surface Contact heat-exchanging, flue gas cools after making processing, it is therefore prevented that the white smoke phenomenon that high-temperature flue gas direct emission is formed, and changing The residual sulfur without handling completely is absorbed by lye before hot, and then is made finally purer with the mixed gas of air dual disposal Only, increase environmental benefit.Above-mentioned air after above-mentioned primary utilization, then with do not enter the flue gas heat exchange before desulfurizing tower, make not take off Sulphur flue gas cool-down increases desulfuration efficiency.This method avoid traditional rotary generative original flue gas/neat stress heat exchangers (GGH) The operating cost that comes into operation it is higher, and easy to produce stifled ash corrosion, the problems such as heat exchange efficiency is low, and pressure difference is far above design value. The characteristics of present invention has investment cost few, and operation power consumption is small, and method is simple and efficient, for fields such as smelting and coal-burning power plants Wet desulfurization flue gas water mist removal, realize energy-saving and emission-reduction synergy provide effective technical guarantee.
Description of the drawings
Fig. 1:The flow chart of the removing method of 1 wet flue gas water mist of embodiment;
Fig. 2:The flow chart of the removing method of 2 wet flue gas water mist of embodiment;
Fig. 3:The flow chart of the removing method of 3 wet flue gas water mist of embodiment;
Wherein:First flue gases of the 1- without desulfurization process, 2- desulfurizing towers, heat smokes of the 3- through desulfurization process, 4- heat exchangers, 5- Air, cooled flue gas of the 6- through heat exchange cooling, 7- fume-dehydrating devices, 8- hot-airs, 9- flue gases and air mixture, 10- chimneys, Arrange mixed flue gas outside 11-, 12- heat exchangers, 13- hot-airs, 14- lye arranges processed alkali solution outside 15-.
Specific implementation mode
Embodiment 1
The present embodiment is the embodiment of the removing method of wet flue gas water mist, as shown in Figure 1, process object is using stone The flue gas after desulfurization water mist of lime stone-gypsum wet sulfur removal technology (WFGD).(sulfur-bearing is about for first flue gas 1 without desulfurization process 450mg/Nm3) entered by the smoke inlet of 2 bottom of desulfurizing tower, by the top exhanst gas outlet row of desulfurizing tower 2 after wet desulphurization Go out (the sulfur-bearing about 25mg/Nm of heat smoke 3 through desulfurization process3) enter in heat exchanger 4, the air 5 entered with adverse current is in heat exchanger 4 heat-transfer surface heat exchange.The heat-transfer surface of heat exchange heat exchanger used using metal surface coating acid corrosion-resistant coating material material or High-molecular organic material or Titanium have good corrosion resistance.Cooled flue gas 6 through the heat exchange discharge of heat exchanger 4 and heat Air 8 is pooled to the condensed water in cooled flue gas 6 of the removing through heat exchange cooling in fume-dehydrating device 7, dewatered flue gas and sky Gas mixture 9 is sent into chimney 10, by arranging mixed flue gas 11 outside 10 top of chimney.
By the way that wet-method desulfurized fume and air by heat exchanger indirect heat exchange, are realized that flue gas cools, air adds Heat heating is cooled to 30~50 DEG C by about 40~60 DEG C of 3 temperature of heat smoke that wet desulphurization is handled by the heat exchange of heat exchanger 4, Air 5 is warming up to 10~30 DEG C by -10~10 DEG C.Atmosphere temperature rising so that heat content increases, and air is with flue gas mixed flue gas 9 by cigarette Chimney discharges, about 25~45 DEG C of temperature, and mixture temperature raising eliminates white water mist caused by water vapour content height.And this method Operation cost of investment is low, cost recovery high efficiency, and energy conservation and environmental protection synergistic effect is apparent.
Embodiment 2
The present embodiment is the embodiment of the removing method of wet flue gas water mist, as shown in Fig. 2, process object is using stone The flue gas after desulfurization water mist of lime stone-gypsum wet sulfur removal technology (WFGD).The process flow of the present embodiment and the substantially phase of embodiment 1 Together, different to be, the first flue gas 1 without desulfurization process is exchanging heat with the hot-air 8 through heat exchange heating that heat exchanger 4 is discharged Exchange heat in device 12, make it is untreated just flue gas 1 heat exchange heating subsequently into desulfurizing tower 2 repeat embodiment 1 in operate Flow.Through exchanging heat, the hot-air 13 to heat up again enters in fume-dehydrating device 7, and the secondary profit of air may be implemented in this embodiment 2 With.
By the way that wet-method desulfurized fume and air by heat exchanger indirect heat exchange, are realized that flue gas cools, air adds Heat heating is down to 30~50 by about 40~60 DEG C of 3 temperature of heat smoke that wet desulphurization is handled by the heat exchange of heat exchanger 4 DEG C, air 5 is warming up to 10~30 DEG C by -10~10 DEG C, and the hot-air of first heat exchange heating is transmitted by pipeline at without desulfurization (the sulfur-bearing about 450mg/Nm of first flue gas 1 of reason3) more a height of 120 DEG C of its temperature, 100 are down to by the heat exchange of heat exchanger 12~ 110 DEG C, air is warming up to 40~60 DEG C by 10~30 DEG C.First flue gas 1 without desulfurization process first passes through the heat exchange cooling of hot-air 8 It enters back into wet type desulfurizing equipment, desulfurization water consumption can be reduced, and reduce desulfurizing tower exit gas temperature.And the process utilizes Air is to be utilized with the hot-air after wet-method desulfurized fume indirect heat exchange, the secondary cycle that air may be implemented.Atmosphere temperature rising, So that heat content increases, air is eliminated water vapour content height and is caused after being mixed with flue gas by smoke stack emission, mixture temperature raising White water mist.And this method operation cost of investment is low, cost recovery high efficiency, energy conservation and environmental protection synergistic effect is apparent.
Embodiment 3
The present embodiment is the embodiment of the removing method of wet flue gas water mist, as shown in figure 3, process object is using stone The flue gas after desulfurization water mist of lime stone-gypsum wet sulfur removal technology (WFGD).The process flow of the present embodiment and the substantially phase of embodiment 1 Together, the different heat smokes 3 being through desulfurization process first passes through before entering heat exchanger 4 and exchanging heat with air 5 at lye 14 Reason is neutralized to enter back into heat exchanger 4 after remaining dilute sulfuric acid in doctor solution and be exchanged heat, and processed alkali solution is discharged by 4 bottom of heat exchanger 15。
Heat smoke (sulfur content about 25mg/Nm through desulfurization process3), it first passes through base extraction and enters back into heat exchanger and carry out Heat exchange, the present embodiment are beneficial in that heat smoke first passes through base extraction, can neutralize remaining dilute sulfuric acid, desulfurization in doctor solution The corrosivity of flue gas can select the heat-transfer surface material of the good metal surface coating of heat transfer effect, heat preservation after reducing, pass through by Wet-method desulfurized fume, by heat exchanger indirect heat exchange, realizes that flue gas cools, air heat temperature raising, by wet method with air About 40~60 DEG C of 3 temperature of heat smoke of desulfurization process is cooled to 30~50 DEG C by the heat exchange of heat exchanger 4, and air 5 is by -10~10 DEG C it is warming up to 10~30 DEG C.Atmosphere temperature rising makes heat content increase, air mixed with flue gas after by smoke stack emission, mixture temperature liter Height eliminates white water mist caused by water vapour content height.And this method operation cost of investment is low, cost recovery high efficiency is energy saving Environmentally friendly synergistic effect is apparent.

Claims (5)

1. a kind of removing method of wet type desulfurizing flue gas water mist, it is characterized in that being at least made of following process:
(1) flue gas of wet desulphurization tower gas vent is cooled by the heat-transfer surface indirect contact heat exchanger of heat exchanger with air first Process;
(2) after condensed water is first discharged in the cooled flue gas of indirect contact heat exchanger, then the hot-air after being heated with heat transfer process mixes It is discharged into Atmospheric processes from chimney.
2. the method as described in claim 1, it is characterized in that indirect contact heat exchanger is cooled after process, the hot-air heated can With the flue gas indirect heat exchange before entrance desulfurizing tower.
3. the method as described in claim 1 is coated with resistance to sour it is characterized in that the heat-transfer surface of heat exchanger used uses metal surface The material or high-molecular organic material or Titanium of erosion resisting coating material.
4. the method as described in claim 1, it is characterized in that the flue gas that wet desulphurization tower gas vent is discharged in step (1) is first It is contacted with lye, then cooled by heat-transfer surface indirect contact heat exchanger with air, flue gas and heat transfer process after condensed water is discharged After hot-air mixing after heating air is discharged into from chimney.
5. the method as described in claim 1, it is characterized in that first passing through removal by the flue gas after air cooling in step (2) It is mixed again with hot-air after the removal process of water droplet.
CN201810510751.6A 2018-05-24 2018-05-24 A kind of removing method of wet type desulfurizing flue gas water mist Pending CN108786388A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5896914A (en) * 1981-12-07 1983-06-09 Masahiko Tsunoda Controlling method of white fume preventive device
CN203803351U (en) * 2014-02-22 2014-09-03 浙江大学 System for deeply removing sulfur oxides in coal-fired flue gas
CN104154549A (en) * 2014-08-08 2014-11-19 马玉峰 Boiler wet desulfurization and demisting, smoke reheating and chimney corrosion prevention integrated device and method
CN106474860A (en) * 2015-08-25 2017-03-08 贺方昀 Wet desulfurization flue gas processing system and processing method
CN106512637A (en) * 2016-12-06 2017-03-22 四川省简阳空冷器制造有限公司 Device and method for removing white smoke
CN206810050U (en) * 2017-02-24 2017-12-29 天津华赛尔传热设备有限公司 A kind of flue gas of wet desulphurization disappears white system
CN207299002U (en) * 2017-05-24 2018-05-01 中国科学院广州能源研究所 A kind of wet desulphurization, the tail gas white-smoke-removing device of denitration

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5896914A (en) * 1981-12-07 1983-06-09 Masahiko Tsunoda Controlling method of white fume preventive device
CN203803351U (en) * 2014-02-22 2014-09-03 浙江大学 System for deeply removing sulfur oxides in coal-fired flue gas
CN104154549A (en) * 2014-08-08 2014-11-19 马玉峰 Boiler wet desulfurization and demisting, smoke reheating and chimney corrosion prevention integrated device and method
CN106474860A (en) * 2015-08-25 2017-03-08 贺方昀 Wet desulfurization flue gas processing system and processing method
CN106512637A (en) * 2016-12-06 2017-03-22 四川省简阳空冷器制造有限公司 Device and method for removing white smoke
CN206810050U (en) * 2017-02-24 2017-12-29 天津华赛尔传热设备有限公司 A kind of flue gas of wet desulphurization disappears white system
CN207299002U (en) * 2017-05-24 2018-05-01 中国科学院广州能源研究所 A kind of wet desulphurization, the tail gas white-smoke-removing device of denitration

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