A kind of smoke processing system and wet desulphurization unit
Technical field
The present invention relates to fume treatment field, in particular it relates to a kind of smoke processing system and wet desulphurization unit.
Background technology
Since 2013, China Middle Eastern occurs continuing haze weather, production and living and body to the people
Body health, which is all caused, to be had a strong impact on, and the improvement of the pollution sources such as coal steam-electric plant smoke pollutant emission also more causes new political affairs
The great attention of mansion, National Development and Reform Commission, Chinese Ministry of Environmental Protection etc..2014 Nian9Yue National Energy Boards have issued " coal electricity energy-saving and emission-reduction liter
Level and transformation action plan (2014-2020) ", proposes Air Pollutant Emission of keeping under strict control:" eastern region (Liaoning, Beijing, day
The provinces and cities of Tianjin, Hebei, Shandong, Shanghai, Jiangsu, Zhejiang, Fujian, Guangdong, Hainan etc. 11) newly-built Thermal generation unit atmosphere pollution
Concentration of emission basically reach gas turbine group emission limit (i.e. under the conditions of benchmark oxygen content 6%, flue dust, sulfur dioxide, nitrogen oxygen
Compound concentration of emission is respectively no higher than 10,35,50 milligrams/cubic metre), middle part (Heilungkiang, Jilin, Shanxi, Anhui, lake
The province of north, Hunan, Henan, Jiangxi etc. 8) new-built unit is in principle close to or up gas turbine group emission limit, with encouraging western part
Area's new-built unit is close to or up gas turbine group emission limit ".
Wherein wet method limestone washing method is the most and most ripe sulfur removal technology of countries in the world today application, is also existing rank
The leading technology of section domestic thermal power plant desulfurization.
Because the equipment funds of flue gas-flue gas heater (hereinafter referred to as GGH) put into big, booster fan capacity and power consumption
Height causes station service to improve, and causes GGH operations, maintenance and improvement expenses at a relatively high.Meanwhile, GGH still causes flue gas desulfurization to fill
One of capital equipment of (hereinafter referred to as FGD) accidental shutdown is put, so the desulfurizer mainstream type of coal unit is not at present
If GGH, chimney is generally wet flue gas working condition.
In wet desulfurizing process, when not setting GGH heater heating systems, FGD exit gas temperatures are general higher.Due to
Through wet desulphurization, saturation wet flue gas is expelled directly out by chimney after limestone-gypsum desulphurization system.Wet flue gas is carried on a small quantity
Droplet, and during air is discharged into, cigarette temperature decreases, the saturated vapor that neat stress is carried is analysed with the low condensation of cigarette temperature drop
Go out, the appearance of chimney breast water droplet generates " white cigarette " phenomenon, can cause serious visual pollution, when the temperature of the surroundings is low this
Phenomenon is planted to become apparent.
Further, since smoke moisture increase, temperature reduction, flue gas easily condense in the inwall of chimney, the flue gas in chimney
In operation under positive pressure, in flue gas after the dissolving of remaining sulfur trioxide, corrosivity very strong dilute sulfuric acid solution is formed, particularly when acid solution
Temperature is at 40-80 DEG C, and the corrosivity to inner wall of stack material is extremely strong, forces power plant using more expensive technique to solve chimney
Etching problem.
Prior art is to set flue gas reheater to the main method of saturation wet flue gas problem in chimney, after desulfurization
Neat stress be heated to superheat state, and ensure that flue gas is still moderately overheated in chimney breast, this is to improve having for " white cigarette " phenomenon
Effect measure.
Flue gas reheater can be divided into a variety of patterns such as swinging, heating agent waterpipe type, direct-fired, electrical heating type, in recent years
Come in domestic transformation project to also developed the hybrid flue gas reheat technology of hot Secondary Air.
But either which kind of method is all to sacrifice the heat economy of power plant's whole system to solve the above problems.
Utility model content
The purpose of this utility model is to contain water to overcome the wet desulphurization unit that prior art is present to discharge in flue gas
Dividing the problem of causing visual pollution and stovepipe inner wall corrosion, there is provided a kind of smoke processing system and wet desulphurization unit.
The smoke processing system that the utility model is provided, the system includes flue gas desulfurization device, air-water heat exchanger and chimney;
Wherein, the gas approach of the air-water heat exchanger is connected with the exhanst gas outlet of the flue gas desulfurization device, the gas
The exhanst gas outlet of water- to-water heat exchanger is connected with the gas approach of the stovepipe in the chimney.
Preferably, the system also include deduster and air-introduced machine, wherein, the gas approach of the flue gas desulfurization device with
The exhanst gas outlet connection of the air-introduced machine, the gas approach of the air-introduced machine is connected with the exhanst gas outlet of the deduster.
Preferably, multiple heat exchanger tubes are provided with the air-water heat exchanger, each heat exchanger tube injects and arranged independently of one another
Go out heat transferring medium.
Preferably, it is provided with two heat exchanger tubes in the air-water heat exchanger, and the two heat exchanger tubes are along the air water
Arrange successively in flow of flue gas direction in heat exchanger.
Preferably, the entrance close to the heat exchanger tube of the exhanst gas outlet of the air-water heat exchanger is connected with life water supply source,
The entrance of heat exchanger tube close to the gas approach of the air-water heat exchanger is connected with the condensate supply source in wet desulphurization unit.
Preferably, the bottom of the air-water heat exchanger and the stovepipe is respectively arranged with water collector.
Preferably, flow direction of the chimney inside pipe wall along flue gas is disposed with multiple receipts horizontal stands, and respectively
Individual receipts horizontal stand is connected by downspout, and the water collector of the chimney bottom of the tube is used to receive what is flowed out by the downspout
Water.
Preferably, the system also include condensed-water recovering device, the condensed-water recovering device respectively with the air water
Heat exchanger is connected with the water collector in the chimney.
Preferably, the condensed-water recovering device is sulfur removal technology water tank.
Smoke processing system in the wet desulphurization unit that the utility model is provided, the wet desulphurization unit is above-mentioned cigarette
Gas processing system.
Compared with prior art, the advantage of smoke processing system described in the utility model is:
(1) by this smoke processing system, the moisture in saturation wet flue gas can be spun off from flue gas, it is to avoid cigarette
Chimney outlet produces droplet, " white cigarette " phenomenon occurs, causes visual pollution;
(2) moisture for preventing sulfur trioxide remaining in flue gas to be dissolved in saturation wet flue gas, forms dilute sulfuric acid solution, in height
The lower corrosion chimney inside pipe wall of temperature;
(3) afterheat of saturation wet flue gas is reclaimed, this part afterheat is used for condensate and the life of heat-setting exit of pump
Water is applied flexibly, saving is used for the steam of heat supply in unit, the steam saved, which can return to steam turbine, to be continued to do manual work, and improves energy
Utilization rate, with good energy-saving benefit;
(4) moisture in saturation wet flue gas is reclaimed, the water loss in wet method lime stone washing process, section are reduced to greatest extent
The desulfurization water of desulfurizing tower is saved, power plant water cost, good economy performance is reduced;
(4) the major investment part of whole system includes air-water heat exchanger, air water pipeline and valve and domestic water pump
Power consumption cost, invests small, safeguards simple.
Other features and advantages of the utility model will be described in detail in subsequent embodiment part.
Brief description of the drawings
Accompanying drawing is to be further understood for providing to of the present utility model, and constitutes a part for specification, and following
Embodiment be used to explain the utility model together, but do not constitute to limitation of the present utility model.In the accompanying drawings:
Fig. 1 is the smoke processing system schematic diagram that the utility model is provided.
Description of reference numerals
1st, condenser;2nd, condensate pump;3rd, deduster;4th, air-introduced machine;5th, flue gas desulfurization device;6th, air-water heat exchanger;7、
Water collector I;8th, chimney;9th, stovepipe;10th, water collector II;11st, device for reclaiming moisture.
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.It should be appreciated that herein
Described embodiment is merely to illustrate and explained the utility model, is not limited to the utility model.
As shown in figure 1, the smoke processing system that the utility model is provided includes flue gas desulfurization device 5, the and of air-water heat exchanger 6
Chimney 8, wherein, the gas approach of the air-water heat exchanger 6 is connected with the exhanst gas outlet of the flue gas desulfurization device 5, the gas
The exhanst gas outlet of water- to-water heat exchanger 6 is connected with the gas approach of the stovepipe 9 in the chimney 8.The flue gas desulfurization device 5 is discharged
Flue gas through air-water heat exchanger 6 cool down after flow into chimney 8 in stovepipe 9, finally through smoke stack emission to air.
The smoke processing system that the utility model is provided also includes deduster 3 and air-introduced machine 4, wherein, the flue gas desulfurization
The gas approach of device 5 is connected with the exhanst gas outlet of the air-introduced machine 4, the gas approach of the air-introduced machine 4 and the deduster 3
Exhanst gas outlet connection.The flue gas that wet desulphurization unit is produced passes through the dust collecting process of deduster 3, and flue gas is introduced by air-introduced machine 4
Desulfurizer 5.
In order to ensure that saturation wet flue gas is sufficiently cool, it is preferable that can set multiple heat exchange in the air-water heat exchanger 6
Pipe, each heat exchanger tube injects and discharged heat transferring medium independently of one another.Generally, heat exchanger tube is surface-type heat exchanger tube, is changed
The inside and outside both sides of thermal medium and flue gas respectively from heat exchange tube wall are flowed through, and are exchanged heat by tube wall.
According to the utility model, two heat exchanger tubes, and this can be more preferably set in air-water heat exchanger 6
Two heat exchanger tubes are arranged successively along the flow of flue gas direction in the air-water heat exchanger 6.
According to the utility model, in order to reclaim the afterheat of saturation wet flue gas, it is preferable that the heat exchange of the air-water heat exchanger is situated between
Matter can selected from the condensate in the domestic water and unit of power plant, wherein, by the connection side of the device of the introducing of heat transferring medium
Formula includes:Entrance close to the heat exchanger tube of the exhanst gas outlet of the air-water heat exchanger 6 is connected with life water supply source, close to described
The entrance of the heat exchanger tube of the gas approach of air-water heat exchanger 6 is connected with the condensate supply source in wet desulphurization unit.General feelings
Under condition, the condensate water temperature in unit is not higher than 40 DEG C, can be by the temperature of the flue gas of the outlet drain of flue gas desulfurization device 5
It is cooled to not higher than 42 DEG C;Domestic water water temperature is not higher than 20 DEG C, will can enter by the flue gas close to the air-water heat exchanger 6
The temperature of flue gas after the heat exchanger tube cooling of mouth is cooled to not higher than 22 DEG C.
According to the utility model, in order to reclaim the moisture in saturation wet flue gas, the air-water heat exchanger 6 and the stovepipe
9 bottom is respectively arranged with water collector.
According to the utility model, in order to prevent flue gas in chimney because the moisture condensed in heating and cooling process in smoke evacuation can not
Directly drip or slid along inner wall of stack to the water collector of bottom, especially diameter the big drop for being more than 1mm, it is preferable that
Flow direction of the inwall of stovepipe 9 along flue gas is disposed with multiple receipts horizontal stands, and each is received horizontal stand and passed through
Downspout is connected, and the moisture for each receipts horizontal stand to be collected converges into next receipts horizontal stand, the bottom of stovepipe 9
Water collector is used to receive the water flowed out by the downspout.
According to the utility model, for the moisture in recycling saturation wet flue gas, the system can also include solidifying
Bear water retracting device 11, wherein, the condensed-water recovering device 11 respectively with the air-water heat exchanger 6 and the chimney 8
Water collector is connected.In order to utilize itself potential energy, the moisture being collected into is set to automatically flow into the condensed-water recovering device
In 11, it is preferable that position of the position of the condensed-water recovering device 11 less than the air-water heat exchanger 6 and the chimney 8.
According to the utility model, in order to reduce the dehydration water of desulfurizing tower, the condensed-water recovering device 11 can be preferred
For sulfur removal technology water tank.
The utility model additionally provides a kind of wet desulphurization unit, and the smoke processing system in the wet desulphurization unit is upper
The smoke processing system stated.
The utility model is illustrated below by way of specific embodiment.
Embodiment 1
As shown in figure 1, the smoke processing system that the utility model is provided includes deduster 3, air-introduced machine 4, flue gas desulfurization dress
5, air-water heat exchanger 6, chimney 8 and sulfur removal technology water tank 11 are put, wherein, gas approach and the cigarette of the air-water heat exchanger 6
The exhanst gas outlet connection of desulfurization device 5, the cigarette of the exhanst gas outlet of the air-water heat exchanger 6 and the stovepipe 9 in the chimney 8
Gas inlet communication;The gas approach of the flue gas desulfurization device 5 is connected with the exhanst gas outlet of the air-introduced machine 4, the air-introduced machine 4
Gas approach connected with the exhanst gas outlet of the deduster 3;The bottom difference of the air-water heat exchanger 6 and the stovepipe 9
It is provided with water collector;The sulfur removal technology water tank 11 respectively with the water collector in the air-water heat exchanger 6 and the chimney 8
Connection, and position of the position less than the air-water heat exchanger 6 and the chimney 8 of the sulfur removal technology water tank 11;The gas
Two heat exchanger tubes are set in water- to-water heat exchanger 6, and the two heat exchanger tubes are along the flow of flue gas direction in the air-water heat exchanger 6
Arrange successively, the entrance close to the heat exchanger tube of the exhanst gas outlet of the air-water heat exchanger 6 is connected with life water supply source, close to institute
The entrance of heat exchanger tube for stating the gas approach of air-water heat exchanger 6 is connected with the condensate supply source in wet desulphurization unit;It is described
The high about 210m of stovepipe 9, flow direction of the inwall of stovepipe 9 along flue gas is disposed with 15 receipts horizontal stands (from 60m
Receipts horizontal stand is started setting up above), horizontal stand interval 10m is respectively received, and each is received horizontal stand and connected by downspout, the cigarette
The water collector of the bottom of chimney pipe 9 is used to receive the water flowed out by the downspout.
When the smoke processing system that the utility model is provided starts, the flue gas of boiler export passes through the deduster in unit
3 dust collecting process, the flue gas desulfurization device 5 is introduced by the air-introduced machine 4, and desulfurization work is carried out through the flue gas desulfurization device 5
The flue gas discharged after skill flows into the stovepipe 9 in the chimney 8 after the air-water heat exchanger 6 cooling, finally through the cigarette
Chimney pipe 9 is emitted into air after further cooling down.When flue gas is cooled down by the air-water heat exchanger 6, precipitation moisture can be condensed, is fallen into
The water collector of bottom;Flue gas can be cooled down further when passing through the stovepipe 9, condensed the moisture separated out and fallen into the stovepipe
The receipts horizontal stand that flow direction of 9 inwalls along flue gas is set gradually, the bottom of stovepipe 9 is converged into eventually through downspout
Water collector, finally using itself potential energy, automatically flow into the sulfur removal technology water tank 11, for desulfurizing tower dehydration use.
Wherein, the condensate supply source temperature is 40 DEG C, by the flue-gas temperature of the outlet drain of flue gas desulfurization device 5
It is cooled to 42 DEG C;In view of chimney from pull out force, chimney breast flue gas necessarily be greater than environment temperature, the life water supply source temperature
Spend for 20 DEG C, the temperature of the flue gas after the cooling of the heat exchanger tube of the gas approach close to the air-water heat exchanger 6 is cooled to
22℃。
By technical scheme described in the utility model, the moisture in saturation wet flue gas can be detached from flue gas
Come, it is to avoid the chimney outlet of wet desulphurization unit produces droplet, " white cigarette " phenomenon occurs, causes visual pollution, and prevent cigarette
Remaining sulfur trioxide is dissolved in the moisture in saturation wet flue gas in gas, forms dilute sulfuric acid solution, corrodes at high temperature in stovepipe
Wall;Secondly, the moisture spun off from flue gas can reduce power plant water cost, good economy performance with recycling;In addition,
Afterheat in dehydration can for heat-setting exit of pump condensate and domestic water, improve the utilization rate of energy,
With good energy-saving benefit and economic benefit.The utility model is widely portable to various wet desulphurization units, especially
1000MW wet desulphurization units.
Preferred embodiment of the present utility model is described in detail above in association with accompanying drawing, still, the utility model is not limited
Detail in above-mentioned embodiment, can be to skill of the present utility model in range of the technology design of the present utility model
Art scheme carries out a variety of simple variants, and these simple variants belong to protection domain of the present utility model.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the utility model is to each
Possible combination is planted no longer separately to illustrate.
In addition, can also be combined between a variety of embodiments of the present utility model, as long as it is not disobeyed
Thought of the present utility model is carried on the back, it should equally be considered as content disclosed in the utility model.