CN106076094A - A kind of heat exchange liquid collector, desulphurization system and the method for single column Two-way Cycle wet desulphurization - Google Patents

A kind of heat exchange liquid collector, desulphurization system and the method for single column Two-way Cycle wet desulphurization Download PDF

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Publication number
CN106076094A
CN106076094A CN201610573895.7A CN201610573895A CN106076094A CN 106076094 A CN106076094 A CN 106076094A CN 201610573895 A CN201610573895 A CN 201610573895A CN 106076094 A CN106076094 A CN 106076094A
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China
Prior art keywords
cooling
values
cooling medium
liquid collector
flue gas
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CN201610573895.7A
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CN106076094B (en
Inventor
吴华
崔琳
常景彩
张立强
董勇
马春元
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Guoneng (Shandong) energy environment Co.,Ltd.
Shandong University
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Shandong University
Shandong Shenhua Shanda Energy and Environment Co Ltd
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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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • B01D53/507Sulfur oxides by treating the gases with other liquids
    • 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
    • B01D53/96Regeneration, reactivation or recycling of reactants
    • 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 invention discloses a kind of heat exchange liquid collector, desulphurization system and the method for single column Two-way Cycle wet desulphurization, flue gas enters from the lower inlet of desulfurizing tower, preliminary purification process is carried out after low ph value serosity sprays, the flue gas of preliminary purification contacts with described heat exchange liquid collector, carrying out heat exchange with cooling medium, reduce the temperature of flue gas, the flue gas after cooling continues to rise, deep purifying is carried out, the fume emission after purification with high ph-values slurry liquid contacts;After high ph-values serosity is collected by liquid collector, high ph-values serosity is lowered the temperature with cooling medium heat exchange, and the high ph-values serosity after cooling is circulated spray to flue gas.Being provided with helical duct in liquid collector, be passed through cooling medium in helical duct, cooling medium carries out heat exchange with wet flue gas and high ph-values serosity, lowers the temperature flue gas and high ph-values serosity, improve the desulfurized effect of desulphurization system.

Description

A kind of heat exchange liquid collector, desulphurization system and the method for single column Two-way Cycle wet desulphurization
Technical field
The invention belongs to industrial waste gas purifying field of Environment Protection, particularly to the heat exchange collection of a kind of single column Two-way Cycle wet desulphurization Liquid device, desulphurization system and method.
Background technology
Single pH value is used to run from the most widely used conventional limestone-gypsum wet flue gas desulfurizing different, single column Two-way Cycle wet process of FGD uses the double pH value in double loop to run, and the pH value of lower closed circuit is 4.0-5.5, and its Main Function is Flue gas is cooled down, pre-washes flue gas and the calcium sulfite oxidation obtained is become Gypsum Fibrosum;The pH value of upper closed circuit is 5.5-6.5, acts primarily as absorption SO2Effect, two loops are separated by liquid collector.This technology has good SO2Load ripple Dynamic buffer capacity, is particularly suitable for the means of flue gas desulfurization of power plant of high sulfur content, high desulfurization efficiency.
Wet Flue Gas Desulfurization Technology, within the specific limits, slurry temperature is the lowest, SO2With CaCO3Dissolubility in serosity The biggest overall mass transfer coefficient is the biggest, can more effectively improve desulfuration efficiency, although have technology to propose single cycle or single column pair is followed The method of ring desulfurization cooling potentiation, but the method use heat pump combine heat exchanger tower outer to whole serosity or on closed circuit High ph-values serosity is lowered the temperature, the serum recycle spray after cooling, it is achieved the cooling potentiation of desulphurization system, and uses heat pump to combine There is the problems such as system complex, investment cost height and floor space are big in the outer heat exchange mode of the tower of heat exchanger.
Summary of the invention
For technical problem present in prior art, it is an object of the invention to propose a kind of single column Two-way Cycle wet method The liquid collector of desulfurization, this liquid collector has heat exchange function, while realizing desulfurization double pH value operation, passes through liquid collector Carry out heat exchange with wet flue gas and high ph-values loop slurry, reduce flue gas and the temperature of high ph-values loop slurry, enter one on the whole Step improves desulfuration efficiency, effectively reduces investment operating cost.
Second object of the present invention is to provide a kind of single column Two-way Cycle wet desulfurization system, by described liquid collector In be passed through cooling medium, wet flue gas and high ph-values loop slurry are cooled down, it is achieved the double pH value of desulphurization system dual temperature runs, and enters One step improves the desulfuration efficiency of flue gas.
Third object of the present invention is to provide a kind of method utilizing described desulphurization system that flue gas is carried out desulfurization.
In order to solve above technical problem, the technical scheme is that
The heat exchange liquid collector of a kind of single column Two-way Cycle wet desulphurization, it is variable-diameter structure, and the opening diameter of upper end is more than The diameter of lower end, the wall of liquid collector is double-decker, and double-deck interlayer constitutes the cooling chamber accommodating cooling medium, cold But cooling medium entrance is left in the lower end of chamber, and cooling medium outlet is left in the upper end of cooling chamber.
Preferably, it is provided with helical duct in described cooling chamber.
Preferably, the width of described cooling chamber is 0.1-0.5m.
It is further preferred that the width of described helical duct is 0.1-0.5m.A kind of single column Two-way Cycle wet desulphurization cold But system, including cooling medium source and described liquid collector, cooling medium source is by the cooling medium of pump with described liquid collector Entrance connects, and the cooling medium outlet of liquid collector is connected with cooling medium collection device.
Preferably, described cooling medium collection device is pulping tank.
Cooling medium is water, water after heating enters pulping tank and carries out slurrying, has saved water resource, it is to avoid water resource Waste.
Heat exchanger is had it is further preferred that be connected between described liquid collector and pulping tank.Cooling medium after heating leads to Crossing reusable edible after heat exchanger cooling, the heat obtained through heat exchange can be used for the aspects such as heating.
Preferably, described pump is high-pressure hydraulic pump, and high-pressure hydraulic pump is connected with converter.Cooling medium is defeated by high-pressure hydraulic pump Send, by converter regulation pump capacity to meet system cooling requirement.
A kind of single column Two-way Cycle wet desulfurization system, including described cooling system, low ph value serum recycle system and high pH Value serum recycle system, low ph value serum recycle system includes interconnective low ph value spraying layer and low ph value slurry tank, high PH value serum recycle system includes interconnective high ph-values spraying layer and high ph-values slurry tank;Low ph value spraying layer, liquid collecting dress Put and be arranged on from bottom to top in desulfurizing tower with high ph-values slurry tank.
Above liquid collector, desulfurizing tower wall is provided with flinger ring, and connecting bottom liquid collector has catheter.After cooling Serosity flows into high ph-values slurry tank by catheter, and flue gas flows through liquid collector and lowers the temperature, and the flue gas after cooling passes through liquid collecting Space between device and desulfurizing tower enters high ph-values spray district from low ph value spray district.
A kind of method utilizing described desulphurization system that flue gas is carried out desulfurization, comprises the steps:
Flue gas enters from the lower inlet of desulfurizing tower, carries out preliminary purification process, tentatively after low ph value serosity sprays The flue gas purified contacts with described liquid collector, carries out heat exchange with cooling medium, reduces the temperature of flue gas, and the flue gas after cooling continues Continuous rising, carries out deep purifying with high ph-values slurry liquid contacts, the fume emission after purification;
After high ph-values serosity is collected by liquid collector, high ph-values serosity is lowered the temperature with cooling medium heat exchange, the high pH after cooling Value serosity is circulated spray to flue gas.
Preferably, the pH value of described low ph value serosity is 4.0-5.5.
Preferably, the pH value of described high ph-values serosity is 5.5-6.5.
Preferably, described cooling medium is cooling water, and the temperature of cooling water is 15-25 DEG C.
It is further preferred that the flow velocity of described cooling medium is 0.5-3m/s.
Preferably, the flue gas after purification discharges after except mist.
Preferably, in upper closed circuit, high ph-values serosity purification systems is through cooling extent 10-20 DEG C of liquid collector, to protect Demonstrate,prove higher heat exchange efficiency.
The invention have the benefit that
1, being provided with helical duct in the liquid collector of the present invention, can be passed through cooling medium in helical duct, cooling is situated between Matter carries out heat exchange with wet flue gas and high ph-values serosity, lowers the temperature flue gas and high ph-values serosity, improves the de-of desulphurization system Sulphur efficiency;
2, the cooling medium after heating can realize UTILIZATION OF VESIDUAL HEAT IN by heat exchanger heat exchange;
3, the structure of liquid collector is improved by the present invention, and by high-pressure hydraulic pump, cooling water is imported liquid collecting dress In putting, the simple in construction of system, do not increase floor space, the expense that investment runs is low, has broad application prospects.
Accompanying drawing explanation
Fig. 1 is single column dual temperature Two-way Cycle wet method fume desulfurizing system schematic diagram;
Fig. 2 is the sectional view of liquid collector.
Wherein: 1-pump, 2-pulping tank, 3-heat exchanger, 4-liquid collector, 5-high ph-values spraying layer, 6-desulfurizing tower, the low pH of 7- Value spraying layer, 8-high ph-values slurry tank, 9-high ph-values slurry circulating pump, 10-low ph value slurry circulating pump, 11-low ph value serosity Groove, 12-helical duct.
Detailed description of the invention
Provide a preferred forms of the present invention below in conjunction with the accompanying drawings.
As in figure 2 it is shown, the heat exchange liquid collector 4 of a kind of single column Two-way Cycle wet desulphurization, it is variable-diameter structure, opening of upper end Mouth diameter is more than the diameter of lower end, and the wall of liquid collector 4 is double-decker, and double-deck interlayer constitutes receiving cooling medium Cooling chamber, the lower end of cooling chamber leaves cooling medium entrance, and cooling medium outlet is left in the upper end of cooling chamber, as one Planting embodiment, be provided with helical duct 12 in described cooling chamber, the width of cooling chamber is 0.1-0.5m, preferably 0.2- 0.4m, the width of helical duct 12 is 0.1-0.5m, preferably 0.2-0.4m.
As a kind of embodiment, described liquid collector 4 is more than bottom for similar inverted cone-shaped structure, the diameter of upper end open Diameter, serum outlet is left in the bottom of liquid collector 4, additionally, liquid collector 4 can also be arbitrary variable-diameter structure, liquid collecting The inwall of device 4 can be the plane tilted, and can be the cambered surface of indent, it is also possible to be the cambered surface etc. of evagination.
As it is shown in figure 1, the cooling system of a kind of single column Two-way Cycle wet desulphurization, fill including cooling medium source and described liquid collecting Putting 4, cooling medium source is connected with the cooling medium entrance of described liquid collector 4 by pump 1, and the cooling medium of liquid collector 4 goes out Mouth is connected with cooling medium collection device, and cooling medium is cooling water, and cooling water, under the effect of high-pressure hydraulic pump 1, fills from liquid collecting Put the bottom up flowing of 4, flow out from the top cooling medium outlet of liquid collector 4.
As a kind of embodiment, cooling medium collection device is pulping tank 2, and the water after being heated delivers into pulping tank Slurrying in 2.
As another embodiment, it is connected between cooling medium collection device with liquid collector 4 and has heat exchanger 3, cooling Medium collection device is connected with described pump 1, and cooling water is collected after heat exchanger 3 cools down in cooling medium collection device, Recycle.
Further, described pump 1 is high-pressure hydraulic pump, and high-pressure hydraulic pump is connected with converter.Cold working medium is defeated by high-pressure hydraulic pump Send, by converter regulation pump capacity to meet system cooling requirement.
As it is shown in figure 1, a kind of complete single column Two-way Cycle wet desulfurization system, including described cooling system, in desulfurizing tower 6 Being provided with two-layer circulation desulfurization system, upper strata circulation desulfurization system includes high ph-values spraying layer 5, high ph-values slurry tank 8 and high pH Value slurry circulating pump 9, high ph-values spraying layer 5 is made up of several shower nozzles, and multiple shower nozzles are distributed on the same plane of desulfurizing tower, The shower nozzle that high ph-values serosity in high ph-values slurry tank 8 is transported to high ph-values spraying layer 5 is sprayed by high ph-values slurry circulating pump 9 Drenching, the serosity of spray contacts with flue gas, purifying smoke.After the serosity of spray is collected by liquid collector 4, with liquid collector 4 In cooling medium heat exchange cooling, the serum outlet bottom liquid collector 4 of the serosity after cooling flows into high ph-values slurry tank 8 In, it is circulated utilization.
Lower floor's circulation desulfurization system is positioned at the lower section of upper strata circulation desulfurization system, including low ph value slurry tank 11, low ph value Slurry circulating pump 10 and low ph value spraying layer 7, low ph value spraying layer 7 includes that multiple shower nozzle, multiple shower nozzles are distributed in desulfurizing tower 6 Same cross section on.Serosity in low ph value slurry tank 11 is transported to low ph value spraying layer 7 and enters by low ph value slurry circulating pump 10 Row spray.
The method utilizing above-mentioned desulphurization system to carry out desulfurization, comprises the steps:
The flue gas that boiler is discharged enters in desulfurizing tower 6 from the lower end of desulfurizing tower 6, first sprays with from low ph value spraying layer 7 Low ph value (between 4-5.5) slurry liquid contacts carry out SO2Preliminary purification process, the flue gas after preliminary purification is in desulfurizing tower 6 Contact with heat exchange liquid collector 4 and carry out preliminary heat exchange cooling, afterwards with the high ph-values (5.8-6.5 sprayed from high ph-values spraying layer 5 Between) slurry liquid contacts carries out deep purifying process, this fraction slurries is collected by heat exchange liquid collector 4 and carries out heat exchange cooling, with The balance of whole system heat, final high ph-values slurry temperature is consistent with flue-gas temperature after heat exchange, cooling extent 20 DEG C with In, the reduction of temperature can be effectively improved desulfuration efficiency.Flue gas after purification is by discharging from chimney after demister.
Embodiment 1
The flue gas that boiler is discharged enters in desulfurizing tower 6 from the lower end of desulfurizing tower 6, first sprays with from low ph value spraying layer 7 Low ph value (pH value is 4.0) slurry liquid contacts carry out SO2Preliminary purification process, the flue gas after preliminary purification is in desulfurizing tower 6 Contacting with heat exchange liquid collector 4 and carry out preliminary heat exchange cooling, (pH value is with the high ph-values sprayed from high ph-values spraying layer 5 afterwards 5.8) slurry liquid contacts carries out deep purifying process, and heat exchange cooling is collected and carried out to this fraction slurries by heat exchange liquid collector 4, enters The temperature of the cooling water in liquid collector 4 is 20 DEG C, along with the balance of whole system heat, final high ph-values slurry temperature with change After heat, flue-gas temperature is consistent, and cooling extent is 10 DEG C, and the flue gas after purification is by discharging from chimney after demister.The desulfurization of flue gas Efficiency is 98.5%.
Embodiment 2
The flue gas that boiler is discharged enters in desulfurizing tower 6 from the lower end of desulfurizing tower 6, first sprays with from low ph value spraying layer 7 Low ph value (pH value is 5.0) slurry liquid contacts carry out SO2Preliminary purification process, the flue gas after preliminary purification is in desulfurizing tower 6 Contacting with heat exchange liquid collector 4 and carry out preliminary heat exchange cooling, (pH value is with the high ph-values sprayed from high ph-values spraying layer 5 afterwards 6.5) slurry liquid contacts carries out deep purifying process, and heat exchange cooling is collected and carried out to this fraction slurries by heat exchange liquid collector 4, enters The temperature of the cooling water in liquid collector 4 is 20 DEG C, along with the balance of whole system heat, final high ph-values slurry temperature with change After heat, flue-gas temperature is consistent, and cooling extent is 20 DEG C, and the flue gas after purification is by discharging from chimney after demister.The desulfurization of flue gas Efficiency is 99.6%.
Although the detailed description of the invention of the present invention is described by the above-mentioned accompanying drawing that combines, but not to invention protection domain Restriction, one of ordinary skill in the art should be understood that, on the basis of technical scheme, those skilled in the art are not required to Various amendments or deformation that creative work to be paid can be made are the most within the scope of the present invention.

Claims (10)

1. the heat exchange liquid collector of a single column Two-way Cycle wet desulphurization, it is characterised in that: it is variable-diameter structure, the opening of upper end Diameter is more than the diameter of lower end, and the wall of liquid collector is double-decker, and double-deck interlayer constitutes the cold of receiving cooling medium But chamber, the lower end of cooling chamber leaves cooling medium entrance, and cooling medium outlet is left in the upper end of cooling chamber.
Heat exchange liquid collector the most according to claim 1, it is characterised in that: it is provided with spiral in described cooling chamber and leads to Road.
Heat exchange liquid collector the most according to claim 1, it is characterised in that: the width of described cooling chamber is 0.1- 0.5m;
Preferably, the width of described helical duct is 0.1-0.5m.
4. the cooling system of a single column Two-way Cycle wet desulphurization, it is characterised in that: include cooling medium source and claim 1-3 Arbitrary described heat exchange liquid collector, cooling medium source is connected with the cooling medium entrance of described liquid collector by pump, liquid collecting The cooling medium outlet of device is connected with cooling medium collection device.
Cooling system the most according to claim 4, it is characterised in that: described cooling medium collection device is pulping tank;
Preferably, described liquid collector is connected with pulping tank heat exchanger.
Cooling system the most according to claim 4, it is characterised in that: described pump is high-pressure hydraulic pump, high-pressure hydraulic pump and frequency conversion Device connects.
7. a single column Two-way Cycle wet desulfurization system, it is characterised in that: include the arbitrary described cooling system of claim 4-6, Low ph value serum recycle system and high ph-values serum recycle system, low ph value serum recycle system includes interconnective low ph value Spraying layer and low ph value slurry tank, high ph-values serum recycle system includes interconnective high ph-values spraying layer and high ph-values serosity Case;Low ph value spraying layer, liquid collector and high ph-values slurry tank are arranged in desulfurizing tower from bottom to top.
8. one kind utilizes the method that desulphurization system described in claim 7 carries out desulfurization to flue gas, it is characterised in that: include walking as follows Rapid:
Flue gas enters from the lower inlet of desulfurizing tower, carries out preliminary purification process, preliminary purification after low ph value serosity sprays Flue gas contact with described liquid collector, carry out heat exchange with cooling medium, reduce the temperature of flue gas, on the flue gas after cooling continues Rise, carry out deep purifying with high ph-values slurry liquid contacts, the fume emission after purification;
After high ph-values serosity is collected by liquid collector, high ph-values serosity is lowered the temperature with cooling medium heat exchange, the high ph-values slurry after cooling Liquid is circulated spray to flue gas.
Method the most according to claim 8, it is characterised in that: described cooling medium is cooling water, and the temperature of cooling water is 15-25℃;
Preferably, the flow velocity of described cooling medium is 0.5-3m/s.
Method the most according to claim 8, it is characterised in that: in upper closed circuit, high ph-values serosity purification systems is through collection The cooling extent of liquid device 10-20 DEG C.
CN201610573895.7A 2016-07-20 2016-07-20 A kind of heat exchange liquid collector, desulphurization system and the method for the wet desulphurization of single column Two-way Cycle Active CN106076094B (en)

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CN108421399A (en) * 2018-03-23 2018-08-21 东南大学 Collaboration promotes fine particle and the devices and methods therefor of sulfur trioxide acid mist removing in a kind of process of wet desulphurization of single column two-region

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CN205886574U (en) * 2016-07-20 2017-01-18 山东神华山大能源环境有限公司 Single tower dual cycle wet flue gas desulfurization's heat transfer collection liquid device and desulfurization system

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JPS5515632A (en) * 1978-07-19 1980-02-02 Eiichi Uratani Dehumidifier
CN101118133A (en) * 2007-09-06 2008-02-06 杨杰 Novel slab type spiral heat exchanger
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108421399A (en) * 2018-03-23 2018-08-21 东南大学 Collaboration promotes fine particle and the devices and methods therefor of sulfur trioxide acid mist removing in a kind of process of wet desulphurization of single column two-region

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