CN102765772A - Boiler water-feeding deoxidizing device and boiler water-feeding deoxidizing method - Google Patents
Boiler water-feeding deoxidizing device and boiler water-feeding deoxidizing method Download PDFInfo
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- CN102765772A CN102765772A CN2012102690055A CN201210269005A CN102765772A CN 102765772 A CN102765772 A CN 102765772A CN 2012102690055 A CN2012102690055 A CN 2012102690055A CN 201210269005 A CN201210269005 A CN 201210269005A CN 102765772 A CN102765772 A CN 102765772A
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- water
- water tank
- deoxygenation
- deoxidizing
- membrane device
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Abstract
The invention discloses a boiler water-feeding deoxidizing device. The boiler water-feeding deoxidizing device comprises a pre-processor, a deoxidizing water tank, a deoxidizing membrane device, a vacuum pump and a water pump; water flowing through the pre-processor is pre-processed by the pre-processor. The deoxidizing water tank is provided with a water inlet, a water outlet and a vacuum port, wherein the water inlet is connected with the pre-processor; the water outlet is provided with a feeding pipeline; a deoxidizer is added in the feeding pipeline; the deoxidizing membrane device is placed in the membrane water tank and is arranged closing to the water outlet; a rotary membrane deoxidizing membrane device is arranged closing to the water outlet of the deoxidizing water tank and is filled with a stainless steel cloth filler; the vacuum pump is connected with the vacuum port of the deoxidizing water tank; the deoxidizing water tank is in low pressure due to the vacuum pump; the water pump is arranged at the back end of the deoxidizing membrane device; and the water flow is guided by the water pump to flow through the pre-processor, the deoxidizing water tank and the deoxidizing membrane device. The invention further discloses a boiler water-feeding deoxidizing method.
Description
Technical field
The present invention relates to the boiler deoxidizing method technology, relate in particular to a kind of deaeration plant and deoxidation method of oiler feed.
Background technology
Boiler is as a kind of important Thermal Equipment, and its damage type is various, but general all with the oiler feed poor water quality, especially with water in dissolved oxygen exceed standard relevant.By boiler give with in the corrosion that causes of dissolved oxygen become oxygen corrosion, become the depolarize corrosion of oxygen again.
Dissolved oxygen in oiler feed becomes the depolarizer of cathode process in the corrosion reaction, causes steel systeming equipment generation oxygen corrosion.Because the corrosive final product is the oxide compound of iron, therefore can cause the deterioration of oiler feed water quality again.Boiler has strict demand to the feedwater oxygen level, and the oxygen level prescribed value that the high more boiler water supply point of BP allows is just low more.
In order to satisfy the requirement of oiler feed to oxygen level, people have taked multiple technologies and equipment that the oxygen in the multichannel feedwater is removed.Common deoxygenation mode mainly contains: thermal de-aeration, the deoxygenation of vacuum embrane method, chemical deoxidization (iron filings deoxygenation, sponge iron deoxygenation, S-WAT deoxygenation), parsing deoxygenation etc.
It is many to resolve the deoxygenation power consumption, and electric heater is fragile, and gac is changed frequent.The chemical deoxidization temperature influence is bigger, and winter, deaerating effect was poor, and the reagent consumption amount is big, and it is wayward to add dose, and the oiler feed saltiness increases.And conventional filtration deoxygenation needs anti-regeneration, and water loss is big, and deaerating effect is unstable, the Fe that reaction produces
3+Boiler there is spinoff.The thermal de-aeration steam consumption is big, and the start and stop difficulty is difficult to control.For this reason, the meaning of vacuum embrane method deoxygenation is just obvious.
Summary of the invention
Problems such as the present invention is intended to improve the requirement of BW to water quality oxygen amount, and is too high to the water requirement to solve membrane module, and medicament is unfavorable for permanently effective operation, and water ring vacuum pump need water consumption is too much.
According to one embodiment of the invention, a kind of deaeration plant of oiler feed is proposed, comprise pretreater, deoxygenation water tank, deaerating membrane device, vacuum pump and water pump.Pretreater carries out pre-treatment to the water of the pretreater of flowing through.The deoxygenation water tank has water inlet, water outlet and vacuum port, and water inlet is connected to pretreater, and water outlet is equipped with drug feeding pipeline, adds oxygen scavenger in the drug feeding pipeline.The deaerating membrane device is arranged in the deoxygenation water tank, and near the water outlet setting, the rotary film scavenge oxygen film device is near the water outlet setting of deoxygenation water tank and wherein fill the Stainless Steel Cloth filler.Vacuum pump is connected to the vacuum port of deoxygenation water tank, and vacuum pump makes the deoxygenation water tank be in low pressure.Water pump is installed in deaerating membrane device rear end, water pump direct water flow through successively pretreater, deoxygenation water tank and deaerating membrane device.
In one embodiment, pretreater comprises water softening apparatus and security personnel's strainer, and water softening apparatus is connected with security personnel's strainer successively, and water is softened and the treated water of filtration back output of ensuring public security.
In one embodiment, oxygen scavenger is Na
2SO
3
In one embodiment, vacuum pump makes the deoxygenation water tank be in negative pressure.
According to one embodiment of the invention, a kind of deoxidation method of oiler feed is proposed, comprise following step: receive water and water is carried out pre-treatment; Guiding gets into the deoxygenation water tank through pretreated water, and the deoxygenation water tank is in low pressure, from the water outlet adding oxygen scavenger of deoxygenation water tank; Direct water is through the deaerating membrane device, and the rotary film scavenge oxygen film device is near the water outlet setting of deoxygenation water tank and wherein fill the Stainless Steel Cloth filler; Wherein, use that the water pump direct water is carried out pre-treatment successively, flow through deoxygenation water tank and deaerating membrane device wherein.
In one embodiment, pre-treatment comprises that water softening and security personnel filter.
Dash at an embodiment, oxygen scavenger is Na
2SO
3
In one embodiment, the deoxygenation water tank is in negative pressure.
The deaeration plant of oiler feed of the present invention and deoxidation method possess following advantage: the deoxygenation of vacuum embrane method is a physics deoxygenation mode, not controlled by envrionment temperature, can continuous firing.The deaeration plant compact construction, simple to operate, start fast, floor space is little.The operating method of deaeration plant belongs to static state operation, need not backwash, regeneration and heating, low power consuming, and the pressure-losses is little, and is safe and reliable, is easy to safeguard, do not contact hazardous and noxious substances.
Description of drawings
Fig. 1 has disclosed the structure iron according to the deaeration plant of the oiler feed of one embodiment of the invention.
Fig. 2 has disclosed the schema according to the deoxidation method of the oiler feed of one embodiment of the invention.
Embodiment
The basic functional principle of vacuum embrane method deoxygenation is Henry's law and Dalton's law.Can know that according to Henry's law in closed container, any gas is present on the water surface simultaneously, then the intrinsic standoff ratio of Gas Solubility and its oneself is directly proportional, and Gas Solubility is only relevant with the pressure component of itself.Under certain pressure, along with water temperature raises, steam partial pressure increases, and the pressure component of air and oxygen is more and more littler.In the time of 100 ℃, the pressure component of oxygen is reduced to zero, and the dissolved oxygen in the water also is reduced to zero.When water surface upward pressure during less than barometric point, the solubleness of oxygen also can reach zero when low water temperature.Like this, the space oxygen molecule is discharged from or is transformed into other gas on the water surface, thereby the pressure component of oxygen is zero, and water oxygen gas is constantly overflowed, and reaches the effect of deoxygenation.The deoxygenation of vacuum embrane method is generally carried out under 30 ℃～60 ℃ temperature, can realize the deoxygenation under the water surface low-temperature condition.
On the basis of existing vacuum embrane method deaeration plant, the present invention further improves.Long-term observation through to existing vacuum embrane method deaeration plant is found with test; Though the vacuum film deoxidizer removes oxidation stability; But behind 8～10 continuous throughout the twenty-four hour24s the deoxygenation blank can appear; Its reason is wherein sponge iron as deaerating membrane behind the operation several hrs, and deaerating effect descends, and need carry out backwash, regeneration.The present invention improves this.
With reference to shown in Figure 1, Fig. 1 has disclosed the structure iron according to the deaeration plant of the oiler feed of one embodiment of the invention.The deaeration plant 100 of this oiler feed comprises: pretreater 102, deoxygenation water tank 104, deaerating membrane device 106, vacuum pump 108 and water pump 110.The water of 102 pairs of pretreaters of flowing through of pretreater carries out pre-treatment.In one embodiment, pretreater 102 comprises water softening apparatus 121 and security personnel's strainer 122, and water softening apparatus 121 is connected with security personnel's strainer 122 successively, and water is softened and the treated water of filtration back output of ensuring public security.Security personnel filter (cartridge filtration) instigates water to get into filter core inside from the outside of microstraining core (precision is generally less than 5 μ m), and trace suspension thing or fine impurities PM for particulate matter are trapped within the filter core process external.Deoxygenation water tank 104 has water inlet 141, water outlet 142 and vacuum port 143.Water inlet 141 is connected to pretreater 102, and 102 outputs of water inlet 141 reception pretreaters through softening and the filtering water of ensuring public security.Water outlet 142 is equipped with drug feeding pipeline 105, adds oxygen scavenger in the drug feeding pipeline 105.In one embodiment, oxygen scavenger is Na
2SO
3 Water outlet 142 places that among the present invention drug feeding pipeline 105 are arranged on deoxygenation water tank 104 also are improvement.If drug feeding pipeline 105 is arranged on the water inlet 141 of deoxygenation water tank 102, can causes Na in the feedwater that finally offers boiler so
2SO
3Residual content too high, excessive N a
2SO
3Also can cause damage to boiler.Deaerating membrane device 106 is arranged in deoxygenation water tank 104, is arranged on the place near water outlet 142, fills the Stainless Steel Cloth filler in the deaerating membrane device 106.Adding Na from water outlet 142
2SO
3After, Na
2SO
3Can be attached on the Stainless Steel Cloth filler and fully react with these Stainless Steel Cloth fillers as contact reactor with water oxygen gas.Because deaerating membrane device 106 is arranged on water outlet 142 places, add Na from water outlet 142
2SO
3Also more efficient.Find that through experimental observation sponge iron needs backwash and regeneration after non-stop run, so the present invention do not re-use sponge iron, use the Stainless Steel Cloth filler instead and fill deaerating membrane device 106, the Stainless Steel Cloth filler is used as contact reactor, can increase Na
2SO
3With the reaction times of water oxygen gas, make Na
2SO
3Fully react with water oxygen gas, improve deaerating effect on the one hand, on the other hand, can reduce Na
2SO
3Residual content.Vacuum pump 108 is connected to the vacuum port 143 of deoxygenation water tank 104, and vacuum pump 108 makes deoxygenation water tank 104 be in low pressure.In one embodiment, vacuum pump 108 is in deoxygenation water tank 104 to be lower than an atmospheric negative pressure state, to be beneficial to deoxygenation.Water pump 110 is installed in deaerating membrane device 106 rear ends, and the effect of water pump 110 is flow through successively pretreater 102, deoxygenation water tank 104 and deaerating membrane devices 106 of direct water.Because vacuum pump 108 can make deoxygenation water tank 104 be in low pressure or negative pressure state, the use of water pump 110 can effectively reduce the amount of the water of being taken away by vacuum pump 108, improves the utilization ratio of water.
With reference to shown in Figure 2, in conjunction with deaeration plant shown in Figure 1, the present invention also proposes a kind of deoxidation method 200 of oiler feed, and this method comprises following step:
201. receive water and water carried out pre-treatment.In one embodiment, pre-treatment comprises that water softening and security personnel filter.This step is realized by the pretreater among Fig. 1 102.
202. guiding gets into the deoxygenation water tank through pretreated water, the deoxygenation water tank is in low pressure, from the water outlet adding oxygen scavenger of deoxygenation water tank.In one embodiment, oxygen scavenger is Na
2SO
3Step 202 is realized by deoxygenation water tank among Fig. 1 104 and vacuum pump 108 jointly.In one embodiment, vacuum pump 108 is in deoxygenation water tank 104 to be lower than an atmospheric negative pressure state.
203. direct water is through the deaerating membrane device, the deaerating membrane device is near the water outlet setting of deoxygenation water tank and wherein fill the Stainless Steel Cloth filler.Deaerating membrane device 106 is arranged in deoxygenation water tank 104, is arranged on the place near water outlet 142, fills the Stainless Steel Cloth filler in the deaerating membrane device 106.Adding Na from water outlet 142
2SO
3After, Na
2SO
3Can be attached on the Stainless Steel Cloth filler and fully react with these Stainless Steel Cloth fillers as contact reactor with water oxygen gas.Because deaerating membrane device 106 is arranged on water outlet 142 places, add Na from water outlet 142
2SO
3Also more efficient.
In the implementation of this method, use water pump 110 direct water are carried out pre-treatment successively, flow through deoxygenation water tank 104 and deaerating membrane device 106 wherein.
According to the deaeration plant and the deoxidation method of oiler feed of the present invention, water can get into the deaerating membrane device after filtering through softening and security personnel, under the working condition near vacuum, is parsed through most of oxygen and other gas in the water behind the deaerating membrane device.
One group of data contrast is provided below, relatively uses and the testing data of not using the deoxidation method and the deaeration plant of oiler feed of the present invention.
Table 1 has disclosed Na
2SO
3The comparison of excess quantity: for using the result of traditional vacuum embrane method deaeration plant, improve the back before wherein improving for using the result of vacuum embrane method deaeration plant of the present invention.
The index that feeds water before and after table 1 improves synopsis as a result
Find out through feedwater index synopsis before and after improving, under equal conditions, the Na after the improvement
2SO
3Excess quantity reduces by 75% than before improving.
Na
2SO
3Add-on compares, the Na of deaeration plant of the present invention
2SO
3Add-on can reduce 40%.
Pressure of supply water relatively, the pressure of supply water of legacy equipment is 0.2-0.6Mpa, the pressure of supply water of the deaeration plant of the present invention 0.03-0.06Mpa that can descend.
The deaeration plant of oiler feed of the present invention and deoxidation method possess following advantage: the deoxygenation of vacuum embrane method is a physics deoxygenation mode, not controlled by envrionment temperature, can continuous firing.The deaeration plant compact construction, simple to operate, start fast, floor space is little.The operating method of deaeration plant belongs to static state operation, need not backwash, regeneration and heating, low power consuming, and the pressure-losses is little, and is safe and reliable, is easy to safeguard, do not contact hazardous and noxious substances.
Claims (8)
1. the deaeration plant of an oiler feed is characterized in that, comprising:
Pretreater, pretreater carries out pre-treatment to the water of the pretreater of flowing through;
The deoxygenation water tank, the deoxygenation water tank has water inlet, water outlet and vacuum port, and water inlet is connected to pretreater, and water outlet is equipped with drug feeding pipeline, adds oxygen scavenger in the drug feeding pipeline;
The deaerating membrane device is arranged in the deoxygenation water tank, and near the water outlet setting, the rotary film scavenge oxygen film device is near the water outlet setting of deoxygenation water tank and wherein fill the Stainless Steel Cloth filler;
Vacuum pump is connected to the vacuum port of deoxygenation water tank, and vacuum pump makes the deoxygenation water tank be in low pressure;
Water pump is installed in deaerating membrane device rear end, water pump direct water flow through successively pretreater, deoxygenation water tank and deaerating membrane device.
2. the deaeration plant of oiler feed as claimed in claim 1 is characterized in that, said pretreater comprises water softening apparatus and security personnel's strainer, and water softening apparatus is connected with security personnel's strainer successively, and water is softened and the treated water of filtration back output of ensuring public security.
3. the deaeration plant of oiler feed as claimed in claim 1 is characterized in that, said oxygen scavenger is Na
2SO
3
4. the deaeration plant of oiler feed as claimed in claim 1 is characterized in that, said vacuum pump makes the deoxygenation water tank be in negative pressure.
5. the deoxidation method of an oiler feed is characterized in that, comprising:
Receive water and water is carried out pre-treatment;
Guiding gets into the deoxygenation water tank through pretreated water, and the deoxygenation water tank is in low pressure, from the water outlet adding oxygen scavenger of deoxygenation water tank;
Direct water is through the deaerating membrane device, and the rotary film scavenge oxygen film device is near the water outlet setting of deoxygenation water tank and wherein fill the Stainless Steel Cloth filler;
Wherein, use that the water pump direct water is carried out pre-treatment successively, flow through deoxygenation water tank and deaerating membrane device wherein.
6. the deaeration plant of oiler feed as claimed in claim 5 is characterized in that, said pre-treatment comprises that water softening and security personnel filter.
7. the deaeration plant of oiler feed as claimed in claim 5 is characterized in that, said oxygen scavenger is Na
2SO
3
8. the deaeration plant of oiler feed as claimed in claim 5 is characterized in that, said deoxygenation water tank is in negative pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102690055A CN102765772A (en) | 2012-07-30 | 2012-07-30 | Boiler water-feeding deoxidizing device and boiler water-feeding deoxidizing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102690055A CN102765772A (en) | 2012-07-30 | 2012-07-30 | Boiler water-feeding deoxidizing device and boiler water-feeding deoxidizing method |
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|---|---|
| CN102765772A true CN102765772A (en) | 2012-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102690055A Pending CN102765772A (en) | 2012-07-30 | 2012-07-30 | Boiler water-feeding deoxidizing device and boiler water-feeding deoxidizing method |
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|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104528858A (en) * | 2014-12-23 | 2015-04-22 | 哈尔滨锅炉厂有限责任公司 | Vacuum type deaerator and deaerating method |
| CN106152107A (en) * | 2015-03-24 | 2016-11-23 | 上海宝钢化工有限公司 | A kind of waste heat boiler deaerating type of cycles and deoxyprocess |
| CN108341452A (en) * | 2018-03-14 | 2018-07-31 | 广西民族大学 | A kind of method that membrane separating process couples removing oxygen in water with chemical deoxidation process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104528858A (en) * | 2014-12-23 | 2015-04-22 | 哈尔滨锅炉厂有限责任公司 | Vacuum type deaerator and deaerating method |
| CN104528858B (en) * | 2014-12-23 | 2017-03-08 | 哈尔滨锅炉厂有限责任公司 | Vacuum type oxygen-eliminating device and deoxidation method |
| CN106152107A (en) * | 2015-03-24 | 2016-11-23 | 上海宝钢化工有限公司 | A kind of waste heat boiler deaerating type of cycles and deoxyprocess |
| CN108341452A (en) * | 2018-03-14 | 2018-07-31 | 广西民族大学 | A kind of method that membrane separating process couples removing oxygen in water with chemical deoxidation process |
| CN108341452B (en) * | 2018-03-14 | 2021-07-06 | 广西民族大学 | Method for removing dissolved oxygen in water by coupling membrane separation process and chemical deoxidation process |
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Application publication date: 20121107 |