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CN108217987A - Waste heat boiler dosing blowdown control method - Google Patents

Waste heat boiler dosing blowdown control method Download PDF

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Publication number
CN108217987A
CN108217987A CN201810015687.4A CN201810015687A CN108217987A CN 108217987 A CN108217987 A CN 108217987A CN 201810015687 A CN201810015687 A CN 201810015687A CN 108217987 A CN108217987 A CN 108217987A
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CN
China
Prior art keywords
dosing
stove water
drum
waste heat
heat boiler
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810015687.4A
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Chinese (zh)
Inventor
王晓晶
王岗
王雁飞
薛昊洋
刘小辉
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China ENFI Engineering Corp
Original Assignee
China ENFI Engineering Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China ENFI Engineering Corp filed Critical China ENFI Engineering Corp
Priority to CN201810015687.4A priority Critical patent/CN108217987A/en
Publication of CN108217987A publication Critical patent/CN108217987A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/001Upstream control, i.e. monitoring for predictive control

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses waste heat boiler dosing blowdown control methods, are related to waste heat boiler field.The control method is applied to waste heat boiler, and the waste heat boiler includes the drum, feed-regulating valve and the circulating pump that are connected through pipeline.The control method performs in accordance with the following steps:Detect the data of the stove water of the drum discharge;According to the data of the detection, medicine system dosing from drum described in trend is controlled to clear up incrustation scale therein, the drainage to be controlled periodically to exhaust the stove water in the drum automatically.Waste heat boiler dosing blowdown control method of the present invention, the data for the stove water discharged by detecting drum according to the detection data, control medicine system Automatic Dosing, control of sewage disposal system automatic pollution discharge.Therefore it is high using the system automation degree of control method of the present invention, reaction time is shortened, reduces cost of labor.

Description

Waste heat boiler dosing blowdown control method
Technical field
The present invention relates to waste heat boiler field, more particularly, to a kind of waste heat boiler dosing blowdown control method.
Background technology
Waste heat boiler is key link indispensable in smelting process as a kind of energy saving, emission abatement device, is mainly made With being that the flue gas that furnace body in smelting process generates cools down, while the heat that flue gas cool-down link is discharged is for generating steaming Vapour, steam are used for other production processes again.Waste heat boiler operation stability be directly related to smelting process operating rate and The reliability service of follow-up related system.
Waste heat boiler initial operating stage, evaporation capacity is smaller in temperature-rise period, and stove water quality is held essentially constant.With drum The continuous evaporation of middle stove water, the concentration of stove water scale forming matter calcium and magnesium ion gradually increase, when content has been more than at this temperature molten When solution is spent, part of compounds will be precipitated from solution.The compound of precipitation may form crystal in water, it is also possible to heated Crystal is formed on face, if crystal suspension in water or formed deposit, as sediment.If crystallization process is happened at heated On face and it is solid be adhered on heating surface, then as incrustation scale.To ensure the normal operation of waste heat boiler, need to carry out incrustation scale Cleaning, calcium, magnesium compound are mostly the compound for being insoluble in water, correction additives phosphate are added in into boiler, while periodically will It is that mesh proceeds to one of effective method that stove water, which exhausts,.
Above equipment is referred to as waste heat boiler dosing blowdown control system in afterheat boiler system, the system is by dosing system System is formed with drainage two parts.Medicine system is to add in phosphate in phosphate solution case (being commonly called as dosing tank) by removing Brine forms solution, is passed in waste heat boiler drum with dosing pump and is chemically reacted with the calcium and magnesium ion in stove water, made Scale forming matter in stove water is transformed into soft grain slag.Drainage is the stove water quality in order to ensure waste heat boiler, periodically by one Part stove water exhausts, and with discharge part salinity and grain slag, ensures the salinity stabilization of stove water in certain level.Existing waste heat boiler The simple in equipment of dosing blowdown control system, the valve in drug feeding pipeline are manipulated, and blowdown only with manually-operated gate System is also according only to field experience, and periodically by being accomplished manually the manipulation of waste removal equipment, not only reaction time is long, and consumes big The human cost of amount.
Invention content
The present invention is directed at least solve that length reaction time exists in the prior art and consume the skill of a large amount of human cost One of art problem.For this purpose, the present invention proposes a kind of waste heat boiler dosing blowdown control method.
The present invention provides a kind of waste heat boiler dosing blowdown control methods, applied to waste heat boiler, the waste heat boiler Including the drum, feed-regulating valve and circulating pump connected through pipeline, the control method performs in accordance with the following steps:
Detect the data of the stove water of the drum discharge;
According to the data of the detection, the adding method thereof of control medicine system and the blowdown side of control of sewage disposal system are obtained Method, wherein, the adding method thereof be the control medicine system from drum described in trend dosing to clear up incrustation scale therein, institute It is that the drainage is controlled periodically to exhaust the stove water in the drum automatically to state method for discharging pollution.
Further, the medicine system forms phosphate radical solution by dosing tank, by dosing pump by the dosing tank In phosphate radical solution be pumped into the drum, phosphate radical solution is controlled to enter the drum, the detection by dosing switch valve Data include the pH value of stove water, the dosing step of the adding method thereof is as follows:
Judge whether the pH detected values of the stove water are less than the upper limit,
If the pH detected values of the stove water are higher than the upper limit, stop the dosing pump, and close the dosing and open Close valve,
If the pH detected values of the stove water are less than the upper limit, under judging whether the pH detected values of the stove water are higher than Limit,
If the pH detected values of the stove water are higher than the lower limit, the pH detected values of the stove water are detected again,
If the pH detected values of the stove water are less than the lower limit, the dosing switch valve is opened, and make the dosing pump Start.
Further, the data of the detection further include the liquid level condition for detecting the dosing tank, and the medicine system is led to Dosing blow valve discharge phosphate solution is crossed, the adding method thereof further includes:
Judge whether the liquid level of the dosing tank is less than the upper limit,
If the liquid level of the dosing tank is higher than the upper limit, the dosing blow valve is opened,
If the liquid level of the dosing tank is less than the upper limit, the dosing blow valve is closed, and judge the dosing tank Liquid level whether higher than lower limit,
If the liquid level of the dosing tank is less than the lower limit, stops the dosing pump, close the dosing switch valve,
If the liquid level of the dosing tank is higher than the lower limit, the dosing step is performed.
Further, the drainage discharges the stove water in the drum, the number of the detection by sewage discharging regulation valve According to the phosphoric acid root for further including the stove water for detecting the drum discharge, the method for discharging pollution includes:
Judge whether the phosphoric acid root of the stove water is less than the upper limit,
If the phosphoric acid root of the stove water is higher than the upper limit, the sewage discharging regulation valve is opened,
If the phosphoric acid root of the stove water is less than the upper limit, under judging whether the phosphoric acid root of the stove water is higher than Limit,
If the phosphoric acid root of the stove water is higher than the lower limit, the sewage discharging regulation valve is closed, detects stove water again Phosphoric acid root,
If the phosphoric acid root of the stove water is less than the lower limit, medicine system dosing into the drum is opened.
Further, the data of the detection further include the stove coolant-temperature gage for the discharge for detecting the drum.
Waste heat boiler dosing blowdown control method of the present invention, the data for the stove water discharged by detecting drum, according to The detection data controls medicine system Automatic Dosing, control of sewage disposal system automatic pollution discharge.Therefore control of the present invention is used The system automation degree of method is high, shortens reaction time, reduces cost of labor.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description It obtains significantly or is recognized by the practice of the present invention.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment Significantly and it is readily appreciated that, wherein:
Fig. 1 is the schematic diagram of waste heat boiler dosing blowdown control system according to an embodiment of the invention;
Fig. 2 is the schematic flow chart of waste heat boiler dosing blowdown control method according to an embodiment of the invention;
Fig. 3 is the schematic flow chart of waste heat boiler dosing blowdown control method in accordance with another embodiment of the present invention.
Reference numeral:
1st, waste heat boiler, 2, drum, 3, feed-regulating valve, 4, circulating pump, 5, sewage discharging regulation valve, 6, dosing switch valve, 7, Dosing blow valve, 8, periodical blowdown expander, 9, dosing pump, 10, dosing tank, 11, blowdown cooling bay, the 12, first control cabinet, 13rd, the second control cabinet, 14, dosing tank fluid level transmitter, 15, pH meter, 16, temperature element, 17, phosphate analytical instrument, 18 controls Device, 19 medicine systems, 20 drainages, 21 detection devices,
181st, receiving module, 182, interlocking monitoring module, 183, control module.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
Fig. 1 is the schematic diagram of waste heat boiler dosing blowdown control system according to an embodiment of the invention.Such as Shown in Fig. 1, the present invention provides a kind of waste heat boiler dosing blowdown control systems, are arranged at waste heat boiler, the waste heat pot Stove includes the drum 2, feed-regulating valve 3 and the circulating pump 4 that are connected through pipeline.Through described after the separation of the drum 2 carbonated drink compound Feed-regulating valve 3 and the circulating pump 4 send stove water back to the waste heat boiler flue and carry out Reusability.The system comprises: Medicine system, drainage, detection device and controller 18.
Medicine system is used for into the drum 2 dosing to clear up incrustation scale therein.The medicine system includes:Dosing tank 10th, dosing pump 9, dosing switch valve 6, the first control cabinet 12 and the second control cabinet 13, further include dosing blow valve 7.
Drainage is used to periodically exhaust the stove water in the drum 2.The drainage includes:Sewage discharging regulation valve 5 is determined Phase blowdown expander 8 and blowdown cooling bay 11.The course of work of drainage is that the stove water in drum 2 passes through sewage discharging regulation valve 5 It send to periodical blowdown expander 8, is separated into indirect steam and spent hot water wherein, indirect steam is drawn by special pipeline, waste heat It is sent after water cooling to blowdown cooling bay 11.
Detection device 21 includes pH meter 15, dosing tank fluid level transmitter 14, temperature element 16 and phosphate analytical instrument 17.Inspection Survey the data that device is used to detect the stove water that the drum 2 is discharged.The data of detection include pH detected values, the dosing tank liquid of stove water The phosphoric acid root of position, stove coolant-temperature gage and stove water.
Controller 18 is used to receive the data of the detection device detection, and analyzes the data, is sent out according to analysis result Go out to control signal, the medicine system and the drainage to be controlled to work automatically.The controller 18 includes:Receiving module 181st, monitoring module 182 and control module 183 are interlocked.Receiving module 181 receives pH meter 15, dosing tank level transmitting for reception PH detected values, dosing tank liquid level, stove coolant-temperature gage and the Lu Shui for the stove water that device 14, temperature element 16 and phosphate analytical instrument 17 detect Phosphoric acid root.Interlocking monitoring module 182 is used to analyze the real time data in the receiving module 181 and propose interlocked control. Wherein, interlocked control refers to the interlocked control between dosing pump 9 and dosing switch valve 6.So-called interlocked control refers to dosing switch valve 6 During opening, dosing pump 9 starts;When dosing pump 9 is closed, dosing switch valve 6 is closed.Control module 183 is used to control the dosing The control device and valve of system and the drainage.I.e. control module 183 switchs for control of sewage disposal regulating valve 5, dosing Valve 6, the first control cabinet 12,7 and second control cabinet 13 of dosing blow valve.
Waste heat boiler dosing blowdown control system of the present invention detects the stove of the discharge of drum 2 by detection device The data of water receive the data of the detection device detection by controller 18 and analyze the data, sent out according to analysis result Go out to control signal, the medicine system and the drainage to be controlled to work automatically.Therefore system automation of the present invention Degree is high, shortens reaction time, reduces cost of labor.
In addition, the present invention improves the service life of waste heat boiler while ensuring safety in production.
Fig. 2 is the schematic flow chart of waste heat boiler dosing blowdown control method according to an embodiment of the invention.This Invention provides a kind of waste heat boiler dosing blowdown control method, and applied to waste heat boiler, the waste heat boiler is included through pipeline Drum, feed-regulating valve and the circulating pump of connection, as shown in Fig. 2, the control method performs in accordance with the following steps:
S100 detects the data of the stove water of the drum discharge;
S200 according to the data of the detection, obtains the adding method thereof of control medicine system and the row of control of sewage disposal system Dirty method, wherein, the adding method thereof be the control medicine system from drum described in trend dosing to clear up water therein Dirt, the method for discharging pollution are that the drainage is controlled periodically to exhaust the stove water in the drum automatically.
Further, the medicine system forms phosphate radical solution by dosing tank, by dosing pump by the dosing tank In phosphate radical solution be pumped into the drum, phosphate radical solution is controlled to enter the drum, the detection by dosing switch valve Data include the pH value of stove water, the dosing step of the adding method thereof is as follows:
S112, judges whether the pH detected values of the stove water are less than the upper limit,
If the pH detected values of the stove water are higher than the upper limit, S109 is performed, stops the dosing pump, is performed S110, and the dosing switch valve is closed,
If the pH detected values of the stove water are less than the upper limit, S113 is performed, then judges the pH detected values of the stove water Whether lower limit is higher than,
If the pH detected values of the stove water are higher than the lower limit, S101 is performed, detects the pH detections of the stove water again Value,
If the pH detected values of the stove water are less than the lower limit, S114 is performed, opens the dosing switch valve, performed S115, and make the dosing pump startup.
Further, the data of the detection further include the liquid level condition for detecting the dosing tank, and the medicine system is led to Dosing blow valve discharge phosphate solution is crossed, the adding method thereof further includes:
S103, judges whether the liquid level of the dosing tank is less than the upper limit,
If the liquid level of the dosing tank is higher than the upper limit, S102 is performed, opens the dosing blow valve,
If the liquid level of the dosing tank is less than the upper limit, S106 is performed, closes the dosing blow valve, and perform S108, judges whether the liquid level of the dosing tank is higher than lower limit,
If the liquid level of the dosing tank is less than the lower limit, S109 is performed, stops the dosing pump, performs S110, The dosing switch valve is closed,
If the liquid level of the dosing tank is higher than the lower limit, the dosing step is performed, repeats above-mentioned S112, S113.
Further, the drainage discharges the stove water in the drum, the number of the detection by sewage discharging regulation valve According to the phosphoric acid root for further including the stove water for detecting the drum discharge, the method for discharging pollution includes:
S105, judges whether the phosphoric acid root of the stove water is less than the upper limit,
If the phosphoric acid root of the stove water is higher than the upper limit, S104 is performed, opens the sewage discharging regulation valve,
If the phosphoric acid root of the stove water is less than the upper limit, S107 is performed, judging the phosphoric acid root of the stove water is It is no to be higher than lower limit,
If the phosphoric acid root of the stove water is higher than the lower limit, S111 is performed, closes the sewage discharging regulation valve, performed S101 detects the phosphoric acid root of stove water again,
If the phosphoric acid root of the stove water is less than the lower limit, medicine system dosing into the drum is opened, S114 is performed, opens dosing switch valve, performs S115, starts dosing pump.
Further, the data of the detection further include the stove coolant-temperature gage for the discharge for detecting the drum.
Waste heat boiler dosing blowdown control method of the present invention, the data for the stove water discharged by detecting drum, according to The detection data controls medicine system Automatic Dosing, control of sewage disposal system automatic pollution discharge.Therefore control of the present invention is used The system automation degree of method is high, shortens reaction time, reduces cost of labor.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ", The description of " example ", " specific example " or " some examples " etc. means to combine specific features, the knot that the embodiment or example describe Structure, material or feature are contained at least one embodiment of the present invention or example.In the present specification, to above-mentioned term Schematic representation may not refer to the same embodiment or example.Moreover, specific features, structure, material or the spy of description Point can in an appropriate manner combine in any one or more embodiments or example.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that:Not In the case of being detached from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this The range of invention is limited by claim and its equivalent.

Claims (5)

1. a kind of waste heat boiler dosing blowdown control method, applied to waste heat boiler, the waste heat boiler includes connecting through pipeline Drum, feed-regulating valve and circulating pump, which is characterized in that the control method performs in accordance with the following steps:
Detect the data of the stove water of the drum discharge;
According to the data of the detection, the adding method thereof of control medicine system and the method for discharging pollution of control of sewage disposal system are obtained, In, the adding method thereof be the control medicine system from drum described in trend dosing to clear up incrustation scale therein, the row Dirty method is that the drainage is controlled periodically to exhaust the stove water in the drum automatically.
2. control method according to claim 1, which is characterized in that the medicine system forms phosphate radical by dosing tank Phosphate radical solution in the dosing tank is pumped into the drum by solution by dosing pump, and phosphoric acid is controlled by dosing switch valve Root solution enters the drum, and the data of the detection include the pH value of stove water, and the dosing step of the adding method thereof is as follows:
Judge whether the pH detected values of the stove water are less than the upper limit,
If the pH detected values of the stove water are higher than the upper limit, stop the dosing pump, and close the dosing switch valve,
If the pH detected values of the stove water are less than the upper limit, judge whether the pH detected values of the stove water are higher than lower limit,
If the pH detected values of the stove water are higher than the lower limit, the pH detected values of the stove water are detected again,
If the pH detected values of the stove water are less than the lower limit, the dosing switch valve is opened, and make the dosing pump startup.
3. control method according to claim 2, which is characterized in that the data of the detection further include the detection dosing The liquid level condition of case, the medicine system discharge phosphate solution by dosing blow valve, and the adding method thereof further includes:
Judge whether the liquid level of the dosing tank is less than the upper limit,
If the liquid level of the dosing tank is higher than the upper limit, the dosing blow valve is opened,
If the liquid level of the dosing tank is less than the upper limit, the dosing blow valve is closed, and judge the liquid of the dosing tank Whether position is higher than lower limit,
If the liquid level of the dosing tank is less than the lower limit, stops the dosing pump, close the dosing switch valve,
If the liquid level of the dosing tank is higher than the lower limit, the dosing step is performed.
4. control method according to claim 1, which is characterized in that the drainage discharges institute by sewage discharging regulation valve The stove water in drum is stated, the data of the detection further include the phosphoric acid root for the stove water for detecting the drum discharge, the blowdown Method includes:
Judge whether the phosphoric acid root of the stove water is less than the upper limit,
If the phosphoric acid root of the stove water is higher than the upper limit, the sewage discharging regulation valve is opened,
If the phosphoric acid root of the stove water is less than the upper limit, judge whether the phosphoric acid root of the stove water is higher than lower limit,
If the phosphoric acid root of the stove water is higher than the lower limit, the sewage discharging regulation valve is closed, detects the phosphoric acid of stove water again Root,
If the phosphoric acid root of the stove water is less than the lower limit, medicine system dosing into the drum is opened.
5. control method according to claim 1, which is characterized in that the data of the detection further include the detection drum Discharge stove coolant-temperature gage.
CN201810015687.4A 2018-01-08 2018-01-08 Waste heat boiler dosing blowdown control method Pending CN108217987A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810015687.4A CN108217987A (en) 2018-01-08 2018-01-08 Waste heat boiler dosing blowdown control method

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Application Number Priority Date Filing Date Title
CN201810015687.4A CN108217987A (en) 2018-01-08 2018-01-08 Waste heat boiler dosing blowdown control method

Publications (1)

Publication Number Publication Date
CN108217987A true CN108217987A (en) 2018-06-29

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109187906A (en) * 2018-10-19 2019-01-11 东莞理工学院 Water quality detection device and detection method for industrial boiler
CN113880155A (en) * 2021-10-11 2022-01-04 九江七所精密机电科技有限公司 Online low-pressure boiler water quality adjusting method
CN115143449A (en) * 2022-05-26 2022-10-04 华能山东发电有限公司烟台发电厂 A kind of automatic continuous sewage discharge method and sewage discharge system of steam drum boiler

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109187906A (en) * 2018-10-19 2019-01-11 东莞理工学院 Water quality detection device and detection method for industrial boiler
CN113880155A (en) * 2021-10-11 2022-01-04 九江七所精密机电科技有限公司 Online low-pressure boiler water quality adjusting method
CN113880155B (en) * 2021-10-11 2023-05-05 九江七所精密机电科技有限公司 Online adjusting method for water quality of low-pressure boiler water
CN115143449A (en) * 2022-05-26 2022-10-04 华能山东发电有限公司烟台发电厂 A kind of automatic continuous sewage discharge method and sewage discharge system of steam drum boiler

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Application publication date: 20180629

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