CN102515382A - Discharged circulated cooling water recycling method - Google Patents
Discharged circulated cooling water recycling method Download PDFInfo
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- CN102515382A CN102515382A CN2011103537221A CN201110353722A CN102515382A CN 102515382 A CN102515382 A CN 102515382A CN 2011103537221 A CN2011103537221 A CN 2011103537221A CN 201110353722 A CN201110353722 A CN 201110353722A CN 102515382 A CN102515382 A CN 102515382A
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- cooling water
- recirculated cooling
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- water draining
- lime
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Abstract
The invention discloses a discharged circulated cooling water recycling method. The method comprises the following steps of: adding discharged circulated cooling water, lime, polyferric sulfate and a coagulant aid into a vessel to mix and contact; filtering a mixture obtained after mixing and contacting; and adjusting the pH value of the obtained liquid to 7-8. According to the method provided by the invention, the hardness and the average corrosion rate of the discharged circulated cooling water can be remarkably reduced; and the hardness and the average corrosion rate of water obtained after the discharged circulated cooling water is treated by using the method provided by the invention accord with an industrial water condition.
Description
Technical field
The present invention relates to a kind of recoverying and utilizing method of recirculated cooling water draining.
Background technology
In the production process of thermal power plant, need to use a large amount of recirculated cooling waters that the high-temperature water vapor that is produced by boiler is cooled off.The open architectures of the most employing of recirculating cooling water system at present, therefore, recirculated cooling water can be because of vaporization losses moisture in the process that recycles.
Therefore, recirculated cooling water makes mineral ion concentration wherein raise gradually repeatedly recycling in the process and can taking place gradually to concentrate.If continue the condensed water circulation of this high mineral ion concentration is used as recirculated cooling water, then can cause fouling and corrosion interchanger easily.In order to eliminate these bad harm, directly this condensed water (also being the recirculated cooling water draining) is discharged as waste water usually.
Summary of the invention
The objective of the invention is for a kind of recoverying and utilizing method of recirculated cooling water draining is provided, to reduce sewage discharge and to practice thrift the water source.
The invention provides a kind of recoverying and utilizing method of recirculated cooling water draining; This method comprises: recirculated cooling water draining, lime, bodied ferric sulfate and coagulant aids are added to mix in the container contact; And the mixture that will mix after the contact filters, and the pH value of the liquid that obtains is adjusted to 7-8.
According to said method provided by the invention, through being added to mix in the container, recirculated cooling water draining, lime, bodied ferric sulfate and coagulant aids contact, can the mineral ion in the recirculated cooling water draining be precipitated out; Then, through the operation of follow-up adjusting pH value, can obtain being suitable as the recirculated cooling water of recirculating cooling water system.Therefore, can the recirculated cooling water draining of passing through after the recycled for multiple times be recycled according to said method provided by the invention, thereby reduce sewage discharge, and practice thrift the water source.
Embodiment
The recoverying and utilizing method of recirculated cooling water draining according to the present invention comprises: recirculated cooling water draining, lime, bodied ferric sulfate and coagulant aids are added to mix in the container contact; And the mixture that will mix after the contact filters, and the pH value of the liquid that obtains is adjusted to 7-8.
In the present invention, said recirculated cooling water draining is meant after the recirculated cooling water process recycled for multiple times in the recirculating cooling water system, the waste water of the production requirement that mineral ion excessive concentration wherein and average corrosion rate do not meet recirculated cooling water.Usually, the pH value of said recirculated cooling water draining can be 8-10.5, and hardness is 13-21mmol/L, and average corrosion rate is 0.001-0.01mm/a.Mineral ion in the said recirculated cooling water draining generally includes calcium ion, mg ion, potassium ion, sodium ion, cl ions, sulfate ion etc.In the present invention, said hardness records according to the method for DL-T 502-2006 (thermal power plant's vapour analysis method), and said average corrosion rate records according to the method for HG/T2159-2008.
Method according to the present invention, with respect to the said recirculated cooling water draining of 1kg, the add-on of said lime can be 200-500mg, and the add-on of said bodied ferric sulfate can be 20-50mg, and the add-on of said coagulant aids can be 0.1-2mg.
According to one embodiment of the present invention, in order to realize reusing the reuse water that obtains after sewage work handles, said method can also be included in the process of said mixing contact and in said container, add reuse water.In the present invention, said reuse water is meant that municipal effluent or sewage reach emission standard after treatment or reach the undrinkable water of the standard of recycling, also can be called reuse water.Usually, the pH value of said reuse water can be 7-9, and hardness is 5-10mmol/L, and average corrosion rate is about 0.001-0.004mm/a.In this embodiment, the weight ratio of the add-on of said recirculated cooling water and said reuse water can be 1: 0.1-1.Under preferable case, the weight ratio of the add-on of said recirculated cooling water and said reuse water is 1: 0.5-0.65.Under this preferable case; In order further to improve the water quality of the water that obtains after method according to the present invention is handled; With respect to the mixture in the said container of 1kg; The add-on of said lime is preferably 380-420mg, and the add-on of said bodied ferric sulfate is preferably 25-35mg, and the add-on of said coagulant aids is preferably 0.8-1.2mg.
According to another embodiment of the invention, in said method provided by the invention, in the process of said mixing contact, in said container, do not add reuse water.In this case; In order to obtain the water of water quality preferably, with respect to the mixture in the said container of 1kg, the add-on of said lime is preferably 430-470mg; The add-on of said bodied ferric sulfate is preferably 38-42mg, and the add-on of said coagulant aids is preferably 0.8-1.2mg.
Method according to the present invention, said coagulant aids does not have special qualification, and the coagulant aids of various routines all can be realized the object of the invention.Yet, in order to impel the mineral ion that removes in the said recirculated cooling water draining, the water quality of the water that obtains after handling according to the method for the invention with further raising, said coagulant aids is preferably SEPIGEL 305 and/or Poly aluminum Chloride (PAC).
In the present invention, said SEPIGEL 305 can be cationic polyacrylamide or anionic polyacrylamide.Under preferable case, said SEPIGEL 305 is a cationic polyacrylamide.The number-average molecular weight of said cationic polyacrylamide can be preferably 8,000,000-12,000,000 for 6,000,000-2,500 ten thousand.Under this preferable case, said cationic polyacrylamide and bodied ferric sulfate one work, and have the higher relatively ability that removes mineral ion, thereby can further reduce the mineral ion concentration in the water that obtains after the processing according to the method for the invention.
According to said method provided by the invention, the condition of said mixing contact does not have special qualification, and for example, the temperature of mixing contact can be 5-40 ℃, and the time of mixing contact can be 0.1-1 hour.
According to said method provided by the invention, the reagent that is used to regulate the liquid that obtains after the filtration can be the pH value regulator of various routines, for example can be sulphuric acid soln, hydrochloric acid soln, sodium hydroxide solution, aqua calcis, ammoniacal liquor etc.
In a kind of preferred implementation; Said method provided by the invention preferably also is included in the adding Scale inhibitors in the water after overregulating the pH value; With the water fouling in the process of recycling that obtains after preventing to handle according to the method for the invention; And with respect to the mixture in the said container of 1kg, the add-on of said Scale inhibitors is 0.1-5mg.In the present invention, said Scale inhibitors does not have special qualification, and the Scale inhibitors product of commercially available various routines all is applicable among the present invention.
Below through embodiment the present invention is described further.
Embodiment 1
Present embodiment is used to explain the recoverying and utilizing method of said recirculated cooling water draining provided by the invention.
(the pH value is about 8.5 with the draining of 1kg recirculated cooling water; Hardness is 15mmol/L, and average corrosion rate is about 0.005mm/a), the lime of 450mg, (available from Beijing Sai Taike water technology ltd, the trade mark is CY-901 to the bodied ferric sulfate of 40mg; Down with) and the 1mg cationic polyacrylamide (available from hundred million biochemical worker ltds; Number-average molecular weight is 1,000 ten thousand, down with) be added in the container, and under agitation, mixed 0.5 hour down at 25 ℃.Then; Remove throw out through filtering, and adding concentration is the aqua calcis of 400mg/L in the filtrating that obtains, so that this pH value of filtrate is adjusted to 7-8; Then to the Scale inhibitors that wherein adds 3mg (available from calm and peaceful water treatment ltd; The trade mark is TH-610, down together), obtain fishery products A1.
Embodiment 2
Present embodiment is used to explain the recoverying and utilizing method of said recirculated cooling water draining provided by the invention.
Method according to embodiment 1 is handled said recirculated cooling water draining, and different is that the consumption of lime is 500mg, obtains fishery products A2.
Embodiment 3
Present embodiment is used to explain the recoverying and utilizing method of said recirculated cooling water draining provided by the invention.
Method according to embodiment 1 is handled said recirculated cooling water draining, and different is that the consumption of lime is 200mg, obtains fishery products A3.
Embodiment 4
Present embodiment is used to explain the recoverying and utilizing method of said recirculated cooling water draining provided by the invention.
Method according to embodiment 1 is handled said recirculated cooling water draining, and different is that the add-on of bodied ferric sulfate is 20mg, obtains fishery products A4.
Embodiment 5
Present embodiment is used to explain the recoverying and utilizing method of said recirculated cooling water draining provided by the invention.
Method according to embodiment 1 is handled said recirculated cooling water draining, and different is that the add-on of bodied ferric sulfate is 50mg, obtains fishery products A5.
Embodiment 6
Present embodiment is used to explain the recoverying and utilizing method of said recirculated cooling water draining provided by the invention.
Method according to embodiment 1 is handled said recirculated cooling water draining, and different is that Poly aluminum Chloride (PAC) (available from Nine Dragons Environmental Protection Technology Co., Ltd) the replacement cationic polyacrylamide with identical weight obtains fishery products A6.
Embodiment 7
Present embodiment is used to explain the recoverying and utilizing method of said recirculated cooling water draining provided by the invention.
(the pH value is about 8.5 with the draining of 630g recirculated cooling water; Hardness is 15mmol/L; Average corrosion rate is about 0.005mm/a), (be derived from Dingzhou City iron west sewage work, the pH value is about 8 to the 370g reuse water, and hardness is 6.5mmol/L; Average corrosion rate is about 0.003mm/a), the lime of 400mg, bodied ferric sulfate and the 1mg cationic polyacrylamide of 30mg is added in the container, and under agitation, mixed 1 hour down at 20 ℃.Then, remove throw out, and adding concentration is the sulphuric acid soln of 2.0mg/L in the filtrating that obtains, and so that this pH value of filtrate is adjusted to 7-8, then to the Scale inhibitors that wherein adds 3mg, obtains fishery products A7 through filtering.
Embodiment 8
Present embodiment is used to explain the recoverying and utilizing method of said recirculated cooling water draining provided by the invention.
Method according to embodiment 7 is handled said recirculated cooling water draining, and different is, the add-on of reuse water is 500g, and the add-on of recirculated cooling water draining is 500g, obtains fishery products A8.
Embodiment 9
Present embodiment is used to explain the recoverying and utilizing method of said recirculated cooling water draining provided by the invention.
Method according to embodiment 7 is handled said recirculated cooling water draining, and different is, the consumption of lime is 500mg, and the add-on of bodied ferric sulfate is 20mg, obtains fishery products A9.
Embodiment 10
Present embodiment is used to explain the recoverying and utilizing method of said recirculated cooling water draining provided by the invention.
Method according to embodiment 7 is handled said recirculated cooling water draining, and different is, the consumption of lime is 200mg, and the add-on of bodied ferric sulfate is 50mg, obtains fishery products A10.
Test case
(1) detects erosion rate
According to the average corrosion rate of the above-mentioned fishery products A1-A10 of HG/T2159-2008 (" the mensuration rotary hanging plate method of water conditioner corrosion inhibition ") detection, test result is as shown in table 1 below.
(2) detect hardness (YD)
Detect the hardness of above-mentioned fishery products A1-A10 according to the method for DL-T 502-2006 (thermal power plant's vapour analysis method), test result is as shown in table 1 below.
Table 1
Data by table 1 can be found out; Can obviously reduce the hardness and the average corrosion rate of recirculated cooling water draining according to the method for the invention; Make the water quality of the water that obtains after according to the method for the invention the recirculated cooling water draining being handled meet the standard of GB 50050-1995 " Code for design of industrial recirculating cooling water treatment ", can circulate as industrial circulating cooling water.
Claims (9)
1. the recoverying and utilizing method of a recirculated cooling water draining; This method comprises: recirculated cooling water draining, lime, bodied ferric sulfate and coagulant aids are added to mix in the container contact; And the mixture that will mix after the contact filters, and the pH value of the liquid that obtains is adjusted to 7-8.
2. method according to claim 1, wherein, with respect to the said recirculated cooling water draining of 1kg, the add-on of said lime is 200-500mg, and the add-on of said bodied ferric sulfate is 20-50mg, and the add-on of said coagulant aids is 0.1-2mg.
3. method according to claim 1 and 2, wherein, said coagulant aids is SEPIGEL 305 and/or Poly aluminum Chloride (PAC).
4. method according to claim 1, wherein, the condition of said mixing contact comprises: the temperature of contact is 5-40 ℃, and the time is 0.1-1 hour.
5. method according to claim 1, wherein, said method also is included in the process of said mixing contact and in said container, adds reuse water.
6. method according to claim 5, wherein, the weight ratio of the add-on of said recirculated cooling water draining and said reuse water is 1000: 0.1-1.
7. method according to claim 6, wherein, the weight ratio of the add-on of said recirculated cooling water draining and said reuse water is 1: 0.5-0.65.
8. according to any described method among the claim 5-7; Wherein, with respect to the mixture in the said container of 1kg, the add-on of said lime is 380-420mg; The add-on of said bodied ferric sulfate is 25-35mg, and the add-on of said coagulant aids is 0.8-1.2mg.
9. method according to claim 1, wherein, the pH value of said recirculated cooling water draining is 8-10.5, and hardness is 13-21mmol/L, and average corrosion rate is 0.004-0.01mm/a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103537221A CN102515382A (en) | 2011-11-09 | 2011-11-09 | Discharged circulated cooling water recycling method |
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| CN2011103537221A CN102515382A (en) | 2011-11-09 | 2011-11-09 | Discharged circulated cooling water recycling method |
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| CN102515382A true CN102515382A (en) | 2012-06-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103979709A (en) * | 2014-05-14 | 2014-08-13 | 西安西热水务环保有限公司 | Combined softening processing system and method for circulating water and discharging water |
| CN109516607A (en) * | 2019-01-02 | 2019-03-26 | 江苏富淼科技股份有限公司 | A kind of sewage water treatment method |
Citations (2)
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| CN101318747A (en) * | 2008-07-17 | 2008-12-10 | 山东电力研究院 | Advanced treatment method for urban water of electric power plant |
| CN101985382A (en) * | 2010-10-25 | 2011-03-16 | 国网技术学院 | Advanced treatment method of urban reclaimed water for power plant |
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2011
- 2011-11-09 CN CN2011103537221A patent/CN102515382A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101318747A (en) * | 2008-07-17 | 2008-12-10 | 山东电力研究院 | Advanced treatment method for urban water of electric power plant |
| CN101985382A (en) * | 2010-10-25 | 2011-03-16 | 国网技术学院 | Advanced treatment method of urban reclaimed water for power plant |
Non-Patent Citations (2)
| Title |
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| 徐庆东等: "中水腐蚀特性试验与分析", 《华电技术》 * |
| 徐庆东等: "废水的石灰混凝澄清处理在电力系统中的应用", 《华电技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103979709A (en) * | 2014-05-14 | 2014-08-13 | 西安西热水务环保有限公司 | Combined softening processing system and method for circulating water and discharging water |
| CN109516607A (en) * | 2019-01-02 | 2019-03-26 | 江苏富淼科技股份有限公司 | A kind of sewage water treatment method |
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Application publication date: 20120627 |