CN109539227A - A kind of method that boiler system reduces blowdown rate - Google Patents
A kind of method that boiler system reduces blowdown rate Download PDFInfo
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- CN109539227A CN109539227A CN201811281681.8A CN201811281681A CN109539227A CN 109539227 A CN109539227 A CN 109539227A CN 201811281681 A CN201811281681 A CN 201811281681A CN 109539227 A CN109539227 A CN 109539227A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/54—De-sludging or blow-down devices
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Abstract
The invention discloses a kind of methods that boiler system reduces blowdown rate, and the boiler system includes adder-subtractor, oxygen-eliminating device, boiler, detection device and control device, and the oxygen-eliminating device is set between the adder-subtractor and the boiler；Dissolved solid content in the pH value of demineralized water, the pH value of boiler water and boiler water in the detection device detection oxygen-eliminating device；The control device controls the alkali dosage of the adder-subtractor and the intermittently starting of boiler blow down valve according to the testing result of the detection device, so that the pH value of demineralized water is 8.0~9.0 in the oxygen-eliminating device, the pH value of the boiler water is 10.5~11.5.By intermittently starting blowdown valve and the pH of control boiler water, boiler blowdown rate can either be reduced, boiler thermal efficiency is improved, additionally it is possible to ensured that the salt content of boiler water is not exceeded, avoid the generation of scale in boiler, guarantee that boiler operates normally.
Description
Technical field
This disclosure relates to a kind of method that steam boiler technical field more particularly to boiler system reduce blowdown rate.
Background technique
At runtime, with the output of steam, water is concentrated steam boiler in pot, and water salt content increases in pot, when salt is dense
When degree is increased to a certain extent, water can generate foam in pot, and carbonated drink azeotropic occurs, and steam causes serious void largely with water
Artifical water height keeps furnace control unstable, is furthermore easy to cause scaling on the heating surface of boiler, influences the safety of boiler operatiopn and making for boiler
Use the service life.
The purpose of boiler blow-off is to guarantee that steam quality is good to reduce boiler water concentration, exclude grain slag in time, prevent from being heated
Face fouling.Boiler blow-off should accomplish that pot water can be made to reach criterion of acceptability and heat loss.The size of boiler blow-off amount
Closely related with feedwater quality and evaporation rate, water quality is good, evaporation rate is low, and blowdown flow rate can be less；It is on the contrary then need suitably to increase
Blowdown flow rate and blowdown number.Boiler blow-off amount often indicates with blowdown rate, the blowdown rate control of general industry boiler 5%~
10%, blowdown rate is generally higher.If boiler capacity is 10t/h, runing time is based on 300 days, the every drop of Industrial Boiler blowdown rate
Low 1%, whole year can save 50 tons of fuel oil of about 70 tons of standard coal or saving.Therefore, boiler blowdown rate is reduced to energy-saving and emission-reduction meaning
It is great.
Summary of the invention
The present invention provides a kind of methods that boiler system reduces blowdown rate, to solve boiler blowdown rate in the prior art
High problem.
In order to solve the above-mentioned technical problem, on the one hand the invention discloses following technical solutions: a kind of boiler system, including
Adder-subtractor, oxygen-eliminating device, boiler, detection device and control device, the oxygen-eliminating device be set to the adder-subtractor with it is described
Between boiler；Solid is dissolved in the pH value of demineralized water, the pH value of boiler water and boiler water in the detection device detection oxygen-eliminating device
Object content；The control device controls the alkali dosage and pot of the adder-subtractor according to the testing result of the detection device
The intermittently starting of dirt removing valve, so that the pH value of demineralized water is 8.0~9.0 in the oxygen-eliminating device, the pH value of the boiler water is
10.5~11.5.
As a kind of optional embodiment, when dissolved solid content in the boiler water of detection device detection >=
When 2500mg/L, the control device controls the blowdown valve and opens；When molten in the boiler water of the detection detection device detection
When solving solid content≤2000mg/L, the control device controls the blowdown valve and closes.
As a kind of optional embodiment, the boiler system further includes raw water water feed apparatus, the multimedium being sequentially communicated
Filter, cartridge filter, reverse osmosis unit, decarbonizing tower and sweet-water tank, between the sweet-water tank and the oxygen-eliminating device
It is provided with adder-subtractor.
As a kind of optional embodiment, the control device controls the steam condensate (SC) water return amount of the oxygen-eliminating device, makes
The pH value of demineralized water is 8.0~9.0 in the oxygen-eliminating device, and conductivity is less than 70 μ s/cm.
In order to solve the above-mentioned technical problem, on the other hand the invention discloses following technical solutions: a kind of boiler system drop
The method of low blowdown rate, it is described to reduce blowdown rate method the following steps are included: controlling the alkali dosage of adder-subtractor, make oxygen-eliminating device
The pH value of middle demineralized water is 8.0~9.0；The intermittently starting for controlling boiler blow down valve, makes the pH value 10.5~11.5 of boiler water.
As a kind of optional embodiment, the method for reducing blowdown rate, which is further comprised the steps of:, obtains pot by detection device
Dissolved solid content in furnace water, and wherein: as dissolved solid content >=2500mg/L in the boiler water, control
Device processed controls the blowdown valve and opens；As dissolved solid content≤2000mg/L in the boiler water, control device
The blowdown valve is controlled to close.
As a kind of optional embodiment, the intermittently starting of boiler blow down valve is controlled the following steps are included: working as detection device
When the pH value of the boiler water of detection is 11.4~11.6, preferably as the pH >=11.5 of the boiler water of detection device detection, control
Device processed controls the boiler blow down valve and opens；When the pH value of the boiler water of detection device detection is 10.9~11.1, preferably
As the pH for the boiler water that detection device detects≤11.0, control device controls the boiler blow down valve and closes on ground；When detection fills
When the pH value for setting the boiler water of detection is 10.4~10.6, preferably as the pH≤10.5 of the boiler water of detection device detection,
Control device controls adder-subtractor and increases alkali dosage, until pH >=10.5 of the boiler water of detection device detection, recovery plus alkali
The alkali dosage of device.
As a kind of optional embodiment, the method for reducing blowdown rate is further comprising the steps of: control device control
The steam condensate (SC) water return amount of the oxygen-eliminating device makes the pH value 8.0~9.0 of the demineralized water in the oxygen-eliminating device, and conductivity is small
In 70 μ s/cm.
Above technical scheme provided by the invention can include the following benefits: pass through intermittently starting blowdown valve and control
The pH of boiler water can either reduce boiler blowdown rate, improve boiler thermal efficiency, additionally it is possible to ensure that the salt content of boiler water does not surpass
Mark avoids the generation of scale in boiler, guarantees that boiler operates normally.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The disclosure can be limited.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below to the embodiment of the present invention
In technical solution be clearly and completely described, it is clear that described embodiments are only a part of the embodiments of the present invention,
Instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative labor
Every other embodiment obtained under the premise of dynamic, should fall within the scope of the present invention.
The boiler system of the embodiment of the present invention includes adder-subtractor, oxygen-eliminating device, boiler, detection device and control device,
Oxygen-eliminating device is set between adder-subtractor and boiler；Detection device is used to detect the pH value of the demineralized water in oxygen-eliminating device, boiler water
PH value and boiler water in dissolved solid content；Control device controls the alkali of adder-subtractor according to the testing result of detection device
The intermittently starting of dosage and boiler blow down valve makes the pH value 8.0~9.0 of demineralized water in oxygen-eliminating device, the pH value of boiler water
It is 10.5~11.5.
By intermittently starting blowdown valve and the pH of control boiler water, control method is simple, and labor intensity reduces, and can make to arrange
Dirty rate by 5%~10% be reduced to 1% hereinafter, significantly reduce boiler blowdown rate, improve boiler thermal efficiency, additionally it is possible to ensure boiler
The salt content of water is not exceeded, avoids the generation of scale in boiler, guarantees that boiler operates normally.
Optionally, boiler of the invention is gas fired-boiler, and nominal outlet port pressure is less than 2.5MPa, at water outside pot
Reason, all-welded structure, the Natural Circulation steam boiler without superheater.
As a kind of optional embodiment, as dissolved solid content >=2500mg/L in the boiler water of detection device detection
When, control device control of sewage disposal valve is opened；As dissolved solid content≤2000mg/ in the boiler water of detection detection device detection
When L, control device control of sewage disposal valve is closed.There is national standard in China to Industrial Boiler water quality, such as in GB1576, is to pressure
1.6~2.5MPa, the steam boiler with superheater are, it is specified that the dissolved solid concentration of boiler water is no more than 2500mg/L.This reality
Example is applied by can effectively ensure the dissolution of boiler water according to pH value and dissolved solid content control of sewage disposal valve open and close
Solid concentration is not exceeded, meets requirements of the national standard.
As a kind of optional embodiment, boiler system further includes raw water water feed apparatus, the multi-medium filtering being sequentially communicated
Device, cartridge filter, reverse osmosis unit, decarbonizing tower and sweet-water tank are arranged between the sweet-water tank and the oxygen-eliminating device
There is adder-subtractor.By multiple filtration plant, effectively control turbidity, hardness and full iron index, the water into oxygen-eliminating device can be made
Meet boiler feedwater index, reduce the salt content of water supply, further reduction boiler blowdown rate.
More medium filter is that the higher water of turbidity is passed through under pressure using one or more of filter mediums
Certain thickness granular or non-grain material, so that removing effectively suspended impurity makes the primary filtration device of clarification of water, commonly
Filtrate has quartz sand, anthracite, and manganese sand etc. is mainly used for water process turbidity removal, softened water, prime pretreatment of pure water etc., water outlet
Turbidity is up to 3 degree or less.
Cartridge filter is also referred to as precise filtering device, mostly does shell using stainless steel, and inside dress filter core is main to use
After multimedium pretreatment filtration, before the membrane filter systems such as reverse osmosis, ultrafiltration.It is filtered for filtering out through more medium filter
Subtitle substance afterwards, such as small quartz sand, active carbon particle etc., to ensure water filtration precision and protection film filtering element
Not by the damage of large particulate matter, after cartridge filter is handled, delivery turbidity reaches 1 degree or less.
Reverse osmosis unit application membrane separation technique, can be effectively removed charged ion in water, inorganic matter, colloidal particles,
Bacterium and organic substance etc..
Decarbonizing tower is come stripping water by the wind-force of blower to remove free CO2Equipment, on the one hand reduce boiler, filtering
On the other hand the corrosion of device can reduce the load of anion exchanger, improve the economy and water outlet water of chemical deionization technique
Matter is handled through decarbonizing tower, is discharged CO2Content is less than 5mg/L.
Sweet-water tank provides sufficient demineralized water for boiler, meets boiler replenishing water demand.
As a kind of optional embodiment, control device controls the steam condensate (SC) water return amount of oxygen-eliminating device, makes in oxygen-eliminating device
The pH value of demineralized water is 8.0~9.0, and conductivity is less than 70 μ s/cm.By the alkali dosage and steam that control adder-subtractor simultaneously
Condensate return amount, it can be ensured that the pH value, conductivity of demineralized water meet boiler water requirement in oxygen-eliminating device, reduce demineralized water oxygen
Content avoids boiler water fouling, avoids corrosion boiler, prolonged boiler service life.
The boiler system of the embodiment of the present invention reduces the method for blowdown rate the following steps are included: the alkali of control adder-subtractor is thrown
Dosage makes the pH value 8.0~9.0 of demineralized water in oxygen-eliminating device；The intermittently starting for controlling boiler blow down valve, makes the pH value of boiler water
It is 10.5~11.5.By the pH value of intermittently starting blowdown valve and control boiler water, control method is simple, and labor intensity reduces,
Can make blowdown rate by 5%~10% be reduced to 1% hereinafter, significantly reduce boiler blowdown rate, improve boiler thermal efficiency, additionally it is possible to
Ensure that the salt content of boiler water is not exceeded, avoid the generation of scale in boiler, guarantees that boiler operates normally.
As a kind of optional embodiment, the method for reducing blowdown rate is further comprising the steps of: obtaining and dissolves in boiler water
Solid content, such as by the dissolved solid content in detection device detection boiler water；When the dissolved solid in boiler water
When content >=2500mg/L, control device control of sewage disposal valve is opened；As dissolved solid content≤2000mg/L in boiler water
When, control device control of sewage disposal valve is closed.There is national standard in China to Industrial Boiler water quality, such as in GB1576, is to pressure
1.6~2.5MPa, the steam boiler with superheater are, it is specified that the dissolved solid concentration of boiler water is no more than 2500mg/L.This reality
Example is applied by can effectively ensure the dissolution of boiler water according to pH value and dissolved solid content control of sewage disposal valve open and close
Solid concentration is not exceeded, meets requirements of the national standard.
As a kind of optional embodiment, boiler blow down valve intermittently starting is controlled the following steps are included: when detection device is examined
When the pH of the boiler water of survey >=11.5, control device controls boiler blow down valve and opens；As the pH of the boiler water of detection device detection
When≤11.0, control device control boiler blow down valve is in close state；When pH≤10.5 of the boiler water of detection device detection
When, control device controls adder-subtractor and increases alkali dosage, until pH >=10.5 of the boiler water of detection device detection, extensive at this time
The alkali dosage of multiple adder-subtractor.It, can be under higher pH condition by the scale in boiler by intermittently starting blowdown valve as above
Dissolution discharge, and closes blowdown valve under the conditions of lower pH, and avoiding excessive hot water is discharged leads to energy waste.Pass through above-mentioned side
Method can both be discharged the biggish boiler water of concentration, and in turn avoid energy waste, improve the reasonable utilization of resource.
As a kind of optional embodiment, it is further comprising the steps of to reduce blowdown rate method: the steam for controlling oxygen-eliminating device is cold
Condensate water return amount makes the pH value 8.0~9.0 of the demineralized water in oxygen-eliminating device, and conductivity is less than 70 μ s/cm.By controlling simultaneously
The alkali dosage and steam condensate (SC) water return amount of adder-subtractor, it can be ensured that pH value, the conductivity of demineralized water meet boiler water and want
It asks, reduces demineralized water oxygen content, avoid boiler water fouling, avoid corrosion boiler, prolonged boiler service life.
Embodiment 1
Boiler system include detection device, control device and the raw water water feed apparatus being sequentially communicated, more medium filter,
Cartridge filter, reverse osmosis unit, decarbonizing tower, sweet-water tank, adder-subtractor, oxygen-eliminating device and boiler.Raw water passes sequentially through more Jie
Mass filter, cartridge filter, reverse osmosis unit, decarbonizing tower, sweet-water tank, adder-subtractor, oxygen-eliminating device flow into boiler.Through anti-
The conductivity of permeability apparatus, decarbonizing tower treated demineralized water is 3.21 μ s/cm, pH value 7.8.According to the pH value control of demineralized water
The sodium hydroxide dosage of adder-subtractor processed simultaneously controls steam condensate (SC) water return amount into oxygen-eliminating device, makes demineralized water in oxygen-eliminating device
(25 DEG C) of pH value be 8.4, (25 DEG C) of conductivity be 35 μ s/cm, turbidity, hardness, full iron and dissolved oxygen are all satisfied boiler feedwater
Water quality requirement.
The pH value of real-time detection boiler water, such as pH value every 15min~60min detection boiler water, as the pH of boiler water
When value reaches 11.5, control of sewage disposal valve is opened；When the pH value of boiler water reaches 11.0, control of sewage disposal valve is closed；Work as boiler water
When pH value reaches 10.5, increase sodium hydroxide dosage so that in oxygen-eliminating device (25 DEG C) of pH value of demineralized water be 8.7, until working as
When boiler water pH value reaches 11.0, restore sodium hydroxide dosage, the pH value (25 DEG C) for surveying demineralized water in oxygen-eliminating device at this time is
8.4。
The content of dissolved solid in real-time detection boiler water is 2586mg/L, repeatedly open blowdown valve carry out it is a small amount of,
Uniform blowdown closes blowdown valve, measures boiler at this time when the content for measuring the dissolved solid in boiler water is 1982mg/L
(25 DEG C) of pH value of water are 11.13, and full basicity and phenolphthalein alkalinity are all satisfied a pot water index request.According to boiler water and oxygen-eliminating device
The blowdown rate that boiler water is calculated in middle demineralized water chlorine ion concentration is 0.85%.
Embodiment 2
Boiler system include detection device, control device and the raw water water feed apparatus being sequentially communicated, more medium filter,
Cartridge filter, reverse osmosis unit, decarbonizing tower, sweet-water tank, adder-subtractor, oxygen-eliminating device and boiler.Raw water passes sequentially through more Jie
Mass filter, cartridge filter, reverse osmosis unit, decarbonizing tower, sweet-water tank, adder-subtractor, oxygen-eliminating device flow into boiler.Through anti-
The conductivity of permeability apparatus, decarbonizing tower treated demineralized water is 3.28 μ s/cm, pH value 7.6.According to the pH value control of demineralized water
The sodium hydroxide dosage of adder-subtractor processed simultaneously controls steam condensate (SC) water return amount into oxygen-eliminating device, makes demineralized water in oxygen-eliminating device
(25 DEG C) of pH value be 8.0, (25 DEG C) of conductivity be 43 μ s/cm, turbidity, hardness, full iron and dissolved oxygen are all satisfied boiler feedwater
Water quality requirement.
The pH value of real-time detection boiler water, such as pH value every 15min~60min detection boiler water, as the pH of boiler water
When value reaches 11.5, control of sewage disposal valve is opened；When the pH value of boiler water reaches 10.9, control of sewage disposal valve is closed；Work as boiler water
When pH value reaches 10.4, increase sodium hydroxide dosage so that in oxygen-eliminating device (25 DEG C) of pH value of demineralized water be 8.5, until working as
When boiler water pH value reaches 10.9, restore sodium hydroxide dosage, the pH value (25 DEG C) for surveying demineralized water in oxygen-eliminating device at this time is
8.0。
The content of dissolved solid in real-time detection boiler water is 2500mg/L, repeatedly open blowdown valve carry out it is a small amount of,
Uniform blowdown closes blowdown valve, measures boiler water at this time when measuring the content of dissolved solid of boiler water is 2000mg/L
(25 DEG C) of pH value are 10.98, and full basicity and phenolphthalein alkalinity are all satisfied a pot water index request.It is removed according in boiler water and oxygen-eliminating device
The blowdown rate that boiler water is calculated in salt water chlorine ion concentration is 0.93%.
Embodiment 3
Boiler system include detection device, control device and the raw water water feed apparatus being sequentially communicated, more medium filter,
Cartridge filter, reverse osmosis unit, decarbonizing tower, sweet-water tank, adder-subtractor, oxygen-eliminating device and boiler.Raw water passes sequentially through more Jie
Mass filter, cartridge filter, reverse osmosis unit, decarbonizing tower, sweet-water tank, adder-subtractor, oxygen-eliminating device flow into boiler.Through anti-
The conductivity of permeability apparatus, decarbonizing tower treated demineralized water is 4.37 μ s/cm, pH value 7.5.According to the pH value control of demineralized water
The sodium hydroxide dosage of adder-subtractor processed simultaneously controls steam condensate (SC) water return amount into oxygen-eliminating device, makes demineralized water in oxygen-eliminating device
(25 DEG C) of pH value be 8.7, (25 DEG C) of conductivity be 63 μ s/cm, turbidity, hardness, full iron and dissolved oxygen are all satisfied boiler feedwater
Water quality requirement.
The pH value of real-time detection boiler water, such as pH value every 15min~60min detection boiler water, as the pH of boiler water
When value reaches 11.6, control of sewage disposal valve is opened；When the pH value of boiler water reaches 11.0, control of sewage disposal valve is closed；Work as boiler water
When pH value reaches 10.5, increase sodium hydroxide dosage so that in oxygen-eliminating device (25 DEG C) of pH value of demineralized water be 9.0, until working as
When boiler water pH value reaches 11.0, restore sodium hydroxide dosage, the pH value (25 DEG C) for surveying demineralized water in oxygen-eliminating device at this time is
8.8。
The content of dissolved solid in real-time detection boiler water is 2532mg/L, repeatedly open blowdown valve carry out it is a small amount of,
Uniform blowdown closes blowdown valve, measures boiler water at this time when measuring the content of dissolved solid of boiler water is 1983mg/L
(25 DEG C) of pH value are 11.11, and full basicity and phenolphthalein alkalinity are all satisfied a pot water index request.It is removed according in boiler water and oxygen-eliminating device
The blowdown rate that boiler water is calculated in salt water chlorine ion concentration is 0.81%.
Embodiment 4
Boiler system includes detection device, control device and the more medium filter being sequentially communicated, cartridge filter, anti-
Permeability apparatus, decarbonizing tower, sweet-water tank, adder-subtractor, oxygen-eliminating device and boiler.Raw water passes sequentially through more medium filter, security personnel
Filter, reverse osmosis unit, decarbonizing tower, sweet-water tank, adder-subtractor, oxygen-eliminating device flow into boiler.Through reverse osmosis unit, decarburization
The conductivity of tower treated demineralized water is 4.37 μ s/cm, pH value 7.5.Adder-subtractor is controlled according to the pH value of demineralized water
Sodium hydroxide dosage simultaneously controls steam condensate (SC) water return amount into oxygen-eliminating device, makes the pH value (25 DEG C) of demineralized water in oxygen-eliminating device
It is 9.0, (25 DEG C) of conductivity are 63 μ s/cm, and turbidity, hardness, full iron and dissolved oxygen are all satisfied boiler feedwater quality requirement.
The content of dissolved solid in real-time detection boiler water is 2556mg/L, when the pH value of boiler water reaches 11.5
When, control of sewage disposal valve is opened；When the pH value of boiler water reaches 11.0, control of sewage disposal valve is closed；When boiler water pH value reaches
When 10.5, increase sodium hydroxide dosage, measuring (25 DEG C) of pH value of demineralized water in oxygen-eliminating device is 9.0；When boiler water pH value reaches
When to 11.0, restore sodium hydroxide dosage, making (25 DEG C) of pH value of demineralized water in oxygen-eliminating device is 8.5.When measuring boiler water
When the content of dissolved solid is 1991mg/L, blowdown valve is closed, measuring (25 DEG C) of boiler water pH value at this time is 10.98, complete
Basicity and phenolphthalein alkalinity are all satisfied a pot water index request.It is calculated according to demineralized water chlorine ion concentration in boiler water and oxygen-eliminating device
The blowdown rate of boiler water is 0.75%.
The above is only a specific embodiment of the invention, is made skilled artisans appreciate that or realizing this hair
It is bright.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (8)
1. a kind of boiler system, which is characterized in that the boiler system include adder-subtractor, oxygen-eliminating device, boiler, detection device with
And control device,
The oxygen-eliminating device is set between the adder-subtractor and the boiler；
Dissolved solid contains in the pH value of demineralized water, the pH value of boiler water and boiler water in the detection device detection oxygen-eliminating device
Amount；
The control device controls the alkali dosage and boiler of the adder-subtractor according to the testing result of the detection device
The intermittently starting of blowdown valve, so that the pH value of demineralized water is 8.0~9.0 in the oxygen-eliminating device, the pH value of the boiler water is
10.5~11.5.
2. boiler system according to claim 1, which is characterized in that dissolved when in the boiler water of detection device detection
When solid content >=2500mg/L, the control device controls the blowdown valve and opens；When the pot of detection device detection
In furnace water when dissolved solid content≤2000mg/L, the control device controls the blowdown valve and closes.
3. boiler system according to claim 1 or 2, which is characterized in that the boiler system further includes being sequentially communicated
Raw water water feed apparatus, more medium filter, cartridge filter, reverse osmosis unit, decarbonizing tower and sweet-water tank, the demineralized water
Adder-subtractor is provided between case and the oxygen-eliminating device.
4. boiler system according to claim 3, which is characterized in that the control device controls the steam of the oxygen-eliminating device
Condensate return amount makes the pH value 8.0~9.0 of demineralized water in the oxygen-eliminating device, and conductivity is less than 70 μ s/cm.
5. a kind of method of the reduction blowdown rate of boiler system as described in any one of Claims 1-4, feature exist
In, the reduction blowdown rate method the following steps are included:
The alkali dosage for controlling adder-subtractor, makes the pH value 8.0~9.0 of demineralized water in oxygen-eliminating device；
The intermittently starting for controlling boiler blow down valve, makes the pH value 10.5~11.5 of boiler water.
6. the method according to claim 5 for reducing blowdown rate, which is characterized in that further comprise the steps of: and obtained by detection device
The dissolved solid content in boiler water is taken, and wherein:
As dissolved solid content >=2500mg/L in the boiler water, control device controls the blowdown valve and opens；
As dissolved solid content≤2000mg/L in the boiler water, control device controls the blowdown valve and closes.
7. the method according to claim 5 or 6 for reducing blowdown rate, which is characterized in that control the interval of boiler blow down valve
Open the following steps are included:
As the pH >=11.5 of the boiler water of detection device detection, control device controls the boiler blow down valve and opens；
As the pH≤11.0 of the boiler water of detection device detection, control device controls the boiler blow down valve and closes；
As the pH≤10.5 of the boiler water of detection device detection, control device controls adder-subtractor and increases alkali dosage, until
PH >=10.5 of the boiler water of detection device detection, restore the alkali dosage of adder-subtractor.
8. the method according to claim 7 for reducing blowdown rate, which is characterized in that further comprising the steps of: control device
The steam condensate (SC) water return amount for controlling the oxygen-eliminating device makes the pH value 8.0~9.0 of the demineralized water in the oxygen-eliminating device, conductance
Rate is less than 70 μ s/cm.
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