CN104906818B - Slurry vacuum distillation system and process based on wet flue gas desulfurization - Google Patents
Slurry vacuum distillation system and process based on wet flue gas desulfurization Download PDFInfo
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- CN104906818B CN104906818B CN201510309835.XA CN201510309835A CN104906818B CN 104906818 B CN104906818 B CN 104906818B CN 201510309835 A CN201510309835 A CN 201510309835A CN 104906818 B CN104906818 B CN 104906818B
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Abstract
The invention discloses a slurry vacuum distillation system and process based on wet flue gas desulfurization. The system comprises a desulfurization tower, a spray system, a demister, a slurry circulating pump, a flash distillation device, a condensation device and a vacuum pump. Part of desulfurized slurry is uniformly sprayed into the flash distillation device through the slurry circulating pump and the spray system, part of water in the slurry is rapidly evaporated by virtue of sudden reduction of pressure, and steam enters the condensation device to be subjected to heat exchange to be condensed into water which can be supplied for desulfurization and other processes of power plants; non-condensable gas generated in the condensation process is pumped out by the vacuum pump for maintaining the vacuum degree of the whole system; recycled heat can be used for heating, drying of feed coal, heating of desulfurized flue gas or the like; the temperature of vacuum distilled slurry is lowered, the vacuum distilled slurry is conveyed to the spray system of the desulfurization tower again through the slurry circulating pump, the temperature of flue gas is lowered, and the desulfurization efficiency is improved. According to the invention, the vacuum distillation technology is applied to the wet desulfurization system, energy saving and water saving effects are achieved while the desulfurization efficiency is improved, and a new idea is provided for energy conservation and emission reduction of power plants.
Description
Technical field
The present invention relates to energy and environment field, more particularly to a kind of serosity vacuum distilling system based on wet process of FGD
System and technique.
Background technology
On September 12nd, 2014, National Development and Reform Committee, Chinese Ministry of Environmental Protection and National Energy Board combine and print and distribute《Coal electricity energy-saving and emission-reduction upgrading
With transformation action plan (2014-2020)》, it is desirable to the average net coal consumption rate of newly-built Thermal generation unit less than 300 grams of standard coals/
Kilowatt hour (hereinafter referred to as " gram/kilowatt hour "), to the year two thousand twenty, average net coal consumption rate is less than after the transformation of active service Thermal generation unit
310 grams/kilowatt hour, averagely net coal consumption rate is less than after wherein 600,000 kilowatts of active service and above unit (in addition to Air-cooled Unit) are transformed
300 grams/kilowatt hour.Plan points out that newly-built Thermal generation unit Air Pollutant Emission concentration will be close to or up combustion gas wheel simultaneously
The emission limit of unit, i.e., under the conditions of benchmark oxygen content 6%, flue dust, sulfur dioxide, discharged nitrous oxides concentration be not high respectively
In 10,35,50 milligrams/cubic metre, ultra-clean discharge is realized.Therefore, Thermal generation unit must be adopted from energy-conservation and in terms of reducing discharging two
Take measure to meet above-mentioned requirements.
Flue gas desulphurization system improves its energy utilization rate and desulfurization effect as the important component part in Thermal generation unit
Rate is particularly important.At present, domestic and international wet desulfurization of flue gas by limestone-gypsum method (FGD) technique city in coal fired power plant flue gas desulfurization
Occupation rate is up to more than 90%, but the water consumption of wet desulfurization system account for the 50% of whole coal unit total water consumption with
On., to water-deficient area, especially by the power plant of underground water intake, longtime running will cause the serious broken of groundwater resources for this
It is bad.Evaporated water is the maximum water consumption point of FGD systems in the tower that neat stress is taken away, while substantial amounts of moisture latent heat is also with neat stress
It is lost in, therefore it is the key for controlling whole FGD systems water consume from the water yield that absorption tower is taken away to reduce neat stress, makes full use of flue gas
The latent heat of middle moisture can play significant section thermal effect.If desulfuration efficiency can be improved on the basis of water saving, section heat, you can and
Gu Jieneng and reduction of discharging, sufficiently respond to《Coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-2020)》Requirement.
When in the environment of the liquid of uniform temperature is suddenly exposed to less than its saturation pressure, steam bubble can be quickly formed,
Simultaneously temperature of liquid declines rapidly, and this process is referred to as the flash distillation of liquid.Flash distillation is exactly the saturation water of uniform temperature and pressure
Into in the container for comparing low pressure, because the unexpected reduction of pressure makes these saturation waters become saturated vapor and low-temp low-pressure
Saturation water.Addition without external heat during this, only because reduced pressure, makes part sensible heat be converted into gasification latent heat, makes
Flash distillation produce steam.Through flash distillation, this part high-temperature high pressure water is just changed into low-temp low-pressure water, has reached the purpose of cooling, together
When this part water vapour for flashing off can also be utilized to go heat exchange.Liquid flashes can be collectively referred to as vacuum steaming with water vapour condensation process
Evaporate system.
For traditional wet desulfurizing process, a set of slurry is added in the system of traditional Limestone-gypsum Wet Flue Gas Desulfurization Process
Liquid vacuum distilling system, serosity evaporates under certain vacuum state, and after the water vapour heat exchange of evaporation water is condensed into.Steamed by vacuum
Evaporating can out be used as heating, raw coal drying and other low-temperature heat sources need with heat exchange the heat extraction in loop slurry
Ask, reach energy-conservation purpose；After heat extraction, flue-gas temperature is further reduced in the reduction of loop slurry temperature, absorption tower, so may be used
Further to improve SO2Dissolubility in serosity, so as to improve SO in absorption tower2Absorption efficiency；Flue-gas temperature is reduced, flue gas
In water recovery, the supply of process water can be reduced, while flash-off steam is condensed into water after heat exchange, can be used for power plant
Process water, reach significant water-saving result.Therefore, the multiple mesh that the technology is capable of achieving energy-conservation, water saving, improves desulfuration efficiency
, can simultaneously take into account energy-conservation and reduce discharging.
The content of the invention
The present invention proposes a kind of technology with serosity vacuum distilling as core for desulphurization system transformation, is improving desulfurization effect
On the basis of rate, a large amount of water and heat are reclaimed.A set of serosity is added in the system of traditional Limestone-gypsum Wet Flue Gas Desulfurization Process true
Empty Distallation systm, is delivered to serosity in absorption tower in vacuum distillation plant with spray pump, using shower and nozzle by serosity
Uniformly spray in vacuum distillation plant, serosity is evaporated under certain vacuum state, the water vapour of evaporation is in condensing means
In be condensed into water, the water of condensation is delivered to into desulphurization system technique water tank and power plant using transportation water pump, and other need the ground of moisturizing
Side.Serosity evaporates under low pressure generation steam, and steam extracts heat by heat exchange, while slurry temperature reduces causing flue-gas temperature
Reduce, improve SO2Dissolubility in serosity, so as to improve SO in absorption tower2Absorption efficiency.The heat of recovery can be used to heating,
Fired fuel is dried or heats flue gas after desulfurization etc., and the steam condensate after evaporation can be used for power plant process water, obtain considerable
Energy-saving and water-saving effect.
For achieving the above object, the present invention adopts following technical proposals：
A kind of serosity vacuum distilling system based on wet process of FGD, including desulfurizing tower body, flash distillation plant, condensation dress
Put, desulfurizing tower body bottom portion is provided with serosity area, the demister that desulfurizing tower bodies top is arranged sets in the middle of desulfurizing tower body
It is equipped with spraying zone；The desulfurizing tower body is provided with smoke inlet, the desulfurizing tower sheet below the top in serosity area, spraying zone
Body is provided with outlet flue above demister；The desulfurizing tower is disposed with multi-stage spray system along flue gas direction, described
Slurry circulating pump is provided between the serosity area of desulfurizing tower and spraying zone；The serosity area of the desulfurizing tower and spraying zone respectively with sudden strain of a muscle
The spraying zone and serosity area for steaming device is connected；The flash distillation plant is connected with condensing means, is provided with the condensing means true
Empty pump.
Partial desulfurization tower serosity is uniformly sprayed in vacuum distillation plant by slurry circulating pump and spray system, pressure
Suddenly reduce making the part water in serosity evaporate rapidly, steam is condensed into water into after condensing means heat exchange, be available for desulfurization and its
His power plant process water；By vacuum pumped, vacuum pump plays the whole vacuum of maintenance to the on-condensible gas produced in condensation process
The effect of Distallation systm vacuum；Can be used to heating by the heat that condensing means are reclaimed, fired fuel is dried or adds after thermally desulfurizing
Flue gas etc.；Simultaneously the slurry temperature after vacuum distilling is reduced, and by slurry circulating pump desulfurizing tower spray system is delivered to again, is dropped
Low flue-gas temperature, improves desulfuration efficiency.
In above-mentioned vacuum distilling system, it is provided with serosity between the Desulfurization tower slurry area and flash distillation plant spraying zone and follows
Ring pump.
In above-mentioned vacuum distilling system, it is provided with serosity between the desulfurizing tower spraying zone and flash distillation plant serosity area and follows
Ring pump.
In above-mentioned vacuum distilling system, two-grade desulfurizing tower, the outlet flue and two-grade desulfurizing of the desulfurizing tower are additionally provided with
The smoke inlet of tower is connected.
In above-mentioned vacuum distilling system, the serosity area of the desulfurizing tower and spraying zone respectively with the spraying zone of flash distillation plant
And serosity area is connected.
In above-mentioned vacuum distilling system, described flash distillation plant be disposed with from the bottom to top serosity area, spraying zone and
Steam collecting region.
In above-mentioned vacuum distilling system, the spraying zone of described flash distillation plant is provided with least one-level spray system.
Present invention also offers a kind of serosity vacuum distilling technique based on wet process of FGD, comprises the steps：
(1) serosity is circulated desulfurization by slurry circulating pump in desulfurizing tower；
(2) fraction slurries in desulphurization tower slurry pool are pressurized to into 0.1-0.5MPa at 35-50 DEG C by slurry circulating pump
Afterwards, Jing spray systems spray into vacuum distillation plant；Heat exchange serum recycle amount is by before and after slurry temperature, unit capacity, the vacuum of exchanging heat
Distilling apparatus are relevant.
(3) the part water in serosity evaporates in flash distillation plant, and steam is condensed into water into condensing means, and remaining serosity leads to
The spray system that pump is re-delivered to desulfurizing tower is crossed, flue-gas temperature is further reduced, desulfuration efficiency is improved, is circulated again.
Preferably, the initial depression of vacuum distilling condensed system is 95-99KPa, and absolute pressure is 2-7Kpa.
Preferably, in step (3), the temperature of the steam is 25-35 DEG C.
The vacuum distillation plant, its entrance is provided with spray system, it is ensured that serosity can uniform atomizing increasing evaporating surface
Product, increases vacuum distilling rate.
The vacuum of the vacuum distilling system, is maintained by evaporative condenser process and vacuum pump, also can be taken out by jetting
The other modes such as air pump or vapour compression machine are maintained.
The condensing means, the heated medium in its heat exchanger can be water, or cold-producing medium, purpose is recovery
Heat, makes steam condensation be water.
The heat that condensing means are reclaimed can be used to heating, fired fuel is dried or heat flue gas after desulfurization etc., condensate storage
In condensing means bottom, other use water to can be used for desulphurization system process water or power plant.
The vacuum distilling system is divided into vacuum flash apparatus and condensing means, and the two is to connect, the steam after evaporation
It is directly entered in condensing means and is condensed into water, on-condensible gas passes through vacuum pumped vacuum needed for maintain system；Condense dress
It can be water or cold-producing medium to put heated medium in heat exchanger, to absorb steam heat.
Serosity amount in the step (1) into vacuum distillation plant need to determine according to actual operation parameters.
The amount of evaporated vapor is common by factors such as slurry temperature, system vacuum and spraying effects in the step (2)
It is determined that.
The recovery heat purposes can determine that condensate purposes can determine according to condensate quality according to practical situation.
By above-mentioned technique, vacuum distilling condensed system is capable of achieving for desulphurization system transformation, realizing improving desulfurization effect
Energy-saving and water-saving on the basis of rate.
Description of the drawings
A kind of serosity vacuum distilling system (single column) based on wet process of FGD of Fig. 1, wherein, 1- desulfurizing towers, 2- desulfurization
Slurry spraying system in tower, 3- demisters, 4- slurry circulating pumps, 5- slurry circulating pumps, 6- slurry circulating pumps, 7- serum recycles
Pump, slurry spraying system in 8- flash distillation plants, 9- flash distillation plants, 10- condensing means, 11- vacuum pumps
A kind of serosity vacuum distilling system (double tower) based on wet process of FGD of Fig. 2, wherein, 1- first grade desulfurizing towers, 2-
Slurry spraying system in first grade desulfurizing tower, demister in 3- first grade desulfurizing towers, 4- slurry circulating pumps, 5- slurry circulating pumps, 6- slurries
Liquid circulating pump, 7- slurry circulating pumps, 8- two-grade desulfurizing towers, slurry spraying system in 9- two-grade desulfurizing towers, in 10- two-grade desulfurizing towers
Demister, 11- slurry circulating pumps, 12- slurry circulating pumps, 13- slurry circulating pumps, slurry spraying system in 14- flash distillation plants,
15- flash distillation plants, 16- condensing means, 17- vacuum pumps
Specific embodiment
With reference to the accompanying drawings and examples the present invention is further described.
Embodiment 1：
By taking 300MW units as an example.The initial depression of flash distillation plant 9 and condensing means 10 realized by vacuum pump 11, very
Reciprocal of duty cycle is 95-99KPa, and absolute pressure is 2-7Kpa；Temperature is 35-50 DEG C of fraction slurries (5000t/h- in the slurry pool of desulfurizing tower 1
15000t/h) it is pressurized to after 0.1-0.5MPa by slurry circulating pump 5, Jing spray systems 8 spray into flash distillation plant 9；Due to pressure
Rapid to reduce, serosity is entered after flash distillation plant 9, and part water (100t/h-200t/h) evaporates rapidly, (25-35 DEG C) entrance of steam
Condensing means 10 are condensed into water, and (25-35 DEG C) of the serosity after flash distillation is re-delivered to desulfurizing tower spray system by slurry circulating pump 7
System 2, further reduces flue-gas temperature, improves desulfuration efficiency (bringing up to more than 98.6% from conventional 95%)；Other serosity are same
Conventional wet desulfurization system is circulated by slurry circulating pump 4,6；The heat that condensing means 10 are reclaimed can be used to heating, fired fuel
Flue gas after desulfurization etc. is dried or heats, condensate is stored in the bottom of condensing means 10, can be used for desulphurization system process water or electricity
Factory other use water.
Embodiment 2：
It is that desulphurization system is Two-way Cycle where different from embodiment 1, wherein first grade desulfurizing tower serum recycle is with conventional
Wet desulphurization, the serosity for introducing flash distillation plant comes from first grade desulfurizing tower slurry pool, and the serosity after vacuum distilling is followed by serosity
Ring pump sprays into two-grade desulfurizing tower spray system.Remaining is same as Example 1.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to present invention protection model
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (6)
1. a kind of serosity vacuum distilling system based on wet process of FGD, including desulfurizing tower, flash distillation plant, condensing means, its
It is characterised by, desulfurization tower bottom is provided with serosity area, and the demister that desulfurizing tower top is arranged has spray in desulfurizing tower middle setting
Drench area；The desulfurizing tower is provided with smoke inlet below the top in serosity area, spraying zone, and the desulfurizing tower is in the upper of demister
Side is provided with outlet flue；The desulfurizing tower is disposed with multi-stage spray system, the serosity area of the desulfurizing tower along flue gas direction
Slurry circulating pump is provided between spraying zone；The serosity area of the desulfurizing tower and spraying zone respectively with the spraying zone of flash distillation plant
And serosity area is connected；The flash distillation plant is connected with condensing means, and on the condensing means vacuum pump is provided with；
The vacuum distilling system also includes two-grade desulfurizing tower, the outlet flue of the desulfurizing tower and the smoke inlet phase of two-grade desulfurizing tower
Even；
The spraying zone of the two-grade desulfurizing tower is connected with the serosity area of flash distillation plant.
2. serosity vacuum distilling system as claimed in claim 1, it is characterised in that described flash distillation plant is from the bottom to top successively
It is provided with serosity area, spraying zone and steam collecting region.
3. serosity vacuum distilling system as claimed in claim 1, it is characterised in that the spraying zone of described flash distillation plant is arranged
There is at least one-level spray system.
4. a kind of serosity vacuum distilling technique based on wet process of FGD, it is characterised in that comprise the steps：
（1）Serosity is circulated desulfurization by slurry circulating pump in desulfurizing tower；
（2）Fraction slurries in desulphurization tower slurry pool are pressurized to after 0.1-0.5MPa at 35-50 DEG C by slurry circulating pump, Jing
Spray system sprays into vacuum distillation plant；
（3）Part water in serosity evaporates in vacuum distillation plant, and steam is condensed into water into condensing means, and remaining serosity leads to
The spray system that pump is re-delivered to desulfurizing tower is crossed, is circulated again.
5. the serosity vacuum distilling technique of wet process of FGD is based on as claimed in claim 4, it is characterised in that vacuum distilling
The initial depression of condensed system is 95-99KPa, and absolute pressure is 2-7Kpa.
6. the serosity vacuum distilling technique of wet process of FGD is based on as claimed in claim 4, it is characterised in that the steam
Temperature be 25-35 DEG C.
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| CN201510309835.XA CN104906818B (en) | 2015-06-08 | 2015-06-08 | Slurry vacuum distillation system and process based on wet flue gas desulfurization |
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Address after: 250061, No. ten, No. 17923, Lixia District, Ji'nan City, Shandong Province Patentee after: SHANDONG University Patentee after: Guoneng (Shandong) energy environment Co.,Ltd. Address before: 250061, No. ten, No. 17923, Lixia District, Ji'nan City, Shandong Province Patentee before: SHANDONG University Patentee before: SHANDONG SHENHUA SHANDA ENERGY ENVIRONMENTAL Co.,Ltd. |
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Application publication date: 20150916 Assignee: Shandong Xianghuan Environmental Technology Co.,Ltd. Assignor: SHANDONG University Contract record no.: X2021980012603 Denomination of invention: Slurry vacuum distillation system and process based on wet flue gas desulfurization Granted publication date: 20170517 License type: Common License Record date: 20211117 |
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