WO2025200093A1 - 一种凝结水流量变动时锅炉给水加氨控制方法 - Google Patents

一种凝结水流量变动时锅炉给水加氨控制方法

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Publication number
WO2025200093A1
WO2025200093A1 PCT/CN2024/093275 CN2024093275W WO2025200093A1 WO 2025200093 A1 WO2025200093 A1 WO 2025200093A1 CN 2024093275 W CN2024093275 W CN 2024093275W WO 2025200093 A1 WO2025200093 A1 WO 2025200093A1
Authority
WO
WIPO (PCT)
Prior art keywords
ammonia
condensate
pipeline
ammonia concentration
feed water
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
PCT/CN2024/093275
Other languages
English (en)
French (fr)
Inventor
滕维忠
郭俊文
都劲松
乔越
李鹏
刘彦伟
杨文强
赵辉
李�杰
赵亮
宋涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian Thermal Power Research Institute Co Ltd
Huaneng Laiwu Power Generation Co Ltd
Original Assignee
Xian Thermal Power Research Institute Co Ltd
Huaneng Laiwu Power Generation Co Ltd
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Filing date
Publication date
Application filed by Xian Thermal Power Research Institute Co Ltd, Huaneng Laiwu Power Generation Co Ltd filed Critical Xian Thermal Power Research Institute Co Ltd
Publication of WO2025200093A1 publication Critical patent/WO2025200093A1/zh
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00Component parts or details of steam boilers
    • F22B37/02Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/025Devices and methods for diminishing corrosion, e.g. by preventing cooling beneath the dew point
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00Component parts or details of steam boilers
    • F22B37/02Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/38Determining or indicating operating conditions in steam boilers, e.g. monitoring direction or rate of water flow through water tubes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00Feed-water supply not provided for in other main groups
    • F22D11/02Arrangements of feed-water pumps
    • F22D11/06Arrangements of feed-water pumps for returning condensate to boiler

Definitions

  • the present application relates to the technical field of boiler feed water, and in particular to a method for controlling the addition of ammonia to boiler feed water when the condensate flow rate varies.
  • Boiler feedwater pH control is a crucial component of a power plant's chemical system. Increasing the feedwater's pH by adding ammonia to the feedwater pipeline is the most economical and practical way to prevent metal corrosion. In related technologies, the condensate flow rate from the condenser fluctuates with boiler load fluctuations. If the amount of ammonia added to the incremental condensate is not adjusted promptly and accurately, the pH of the boiler feedwater will not reach the set value, becoming unstable and failing to meet feedwater requirements.
  • an embodiment of the present application aims to solve at least one of the technical problems in the related art to a certain extent.
  • an embodiment of the present application provides a method for controlling the addition of ammonia to boiler feed water when the condensate flow rate varies.
  • the boiler feed water ammonia addition control method when the condensate flow rate changes in the embodiment of the present application is based on a boiler feed water ammonia addition system, which includes a condenser, a condensate pipeline, an ammonia liquid pipeline, an ammonia liquid metering tank and a feed water pipeline.
  • the outlet of the condenser is connected to the inlet of the feed water pipeline through the condensate pipeline
  • the outlet of the ammonia liquid metering tank is connected to the inlet of the feed water pipeline through the ammonia liquid pipeline
  • the outlet of the feed water pipeline is connected to the water inlet of the boiler.
  • a condensate pump is provided on the condensate pipeline
  • a second metering pump is provided on the ammonia liquid pipeline.
  • the second metering pump is a variable frequency pump.
  • the method for controlling the addition of ammonia to boiler feed water when the condensate flow rate changes comprises the following steps:
  • Ammonia solution with an ammonia concentration of C meter NH3 is placed in the ammonia liquid metering tank, and a flow rate change value q of the second metering pump under frequency change per Hz is determined;
  • a third ammonia concentration monitor is provided on the water supply pipeline
  • a second flow meter is provided on the ammonia liquid pipeline
  • a second heater is provided on the fourth pipeline.
  • the condensate pipeline includes a first branch and a second branch connected in parallel, a valve is provided on the first branch, and a fine treatment device is provided on the second branch.
  • FIG1 is a schematic diagram of a boiler feed water ammonia addition system according to an embodiment of the present application.
  • a method for controlling boiler feed water ammonia addition when condensate flow varies according to an embodiment of the present application is based on a boiler feed water ammonia addition system.
  • the boiler feed water ammonia addition system includes a condenser 1, a condensate pipeline 2, an ammonia liquid pipeline 4, an ammonia liquid metering tank 3, a feed water pipeline 5, a deaerator 15, a fourth pipeline 6, a first heater 16 and a second heater 21.
  • the outlet of the condenser 1 is connected to the inlet of the water supply pipeline 5 through the condensate pipeline 2.
  • a condensate pump 7 is provided on the condensate pipeline 2 so that the condensate discharged from the condenser 1 can flow into the water supply pipeline 5.
  • the outlet of the ammonia liquid metering tank 3 is connected to the inlet of the water supply line 5 via the ammonia liquid pipeline 4.
  • a second metering pump 8 is provided on the ammonia liquid pipeline 4. This second metering pump 8 is a variable frequency pump, and its discharge flow rate can be varied by adjusting its frequency. This allows the ammonia solution within the ammonia liquid metering tank 3 to flow into the water supply line 5, thereby adjusting the ammonia concentration of the feed water therein and, consequently, the pH value of the feed water to the boiler 22.
  • the outlet of the water supply line 5 is connected to the water inlet of the boiler 22.
  • the discharge flow rate of the second metering pump 8 (variable frequency pump) is positively correlated with the operating frequency, and adjustment is relatively convenient and precise, allowing for accurate regulation of the ammonia concentration and, consequently, the pH value of the feed water in the water supply line 5.
  • the inlet of deaerator 15 is connected to the outlet of feedwater line 5.
  • the inlet of fourth line 6 is connected to the outlet of deaerator 15.
  • a third pump body 9 is mounted on fourth line 6, and the outlet of fourth line 6 is connected to the water inlet of boiler 22. This allows feedwater discharged from feedwater line 5 to pass through deaerator 15 to remove oxygen, and then pass through fourth line 6 to boiler 22.
  • the first heater 16 is provided on the water supply pipeline 5, and the second heater 21 is provided on the fourth pipeline 6. Specifically, the first heater 16 is a low-pressure heater, and the second heater 21 is a high-pressure heater.
  • the condensate pipeline 2 includes a first branch 17 and a second branch 18 connected in parallel.
  • a valve 19 is provided on the first branch 17, and a polishing device 20 is provided on the second branch 18. Therefore, when the valve 19 closes the first branch 17, the condensate can flow through the second branch 18 into the polishing device 20 to remove impurities in the condensate.
  • the boiler feed water ammonia addition system has the advantage of facilitating real-time and accurate adjustment of the pH value of the feed water.
  • a method for controlling the addition of ammonia to boiler feed water when the condensate flow rate varies includes the following steps.
  • a second ammonia concentration monitor 11 is provided on the ammonia liquid metering tank 3 .
  • step S1 the ammonia concentration of the ammonia solution in the ammonia liquid metering tank 3 is monitored using the second ammonia concentration monitor 11 so that an ammonia solution having an ammonia concentration of C (as NH3 ) is provided in the ammonia liquid metering tank 3.
  • the ammonia concentration of the ammonia solution in the ammonia liquid metering tank 3 is adjusted based on the value monitored by the second ammonia concentration monitor 11 so that the ammonia concentration of the ammonia solution in the ammonia liquid metering tank 3 is C ( as NH3) .
  • a first ammonia concentration monitor 10 is provided on the condensate pipeline 2.
  • step S2 the ammonia concentration of the condensate in the condensate pipeline 2 is monitored by the first ammonia concentration monitor 10 to obtain a value of CNengNH3 .
  • ⁇ C NH3 CfeedNH3 - CcondensedNH3 .
  • ⁇ C NH3 (mg/L) represents the required ammonia concentration change for the condensate in condensate line 2 to meet the water supply requirements
  • CcondensedNH3 (mg/L) is the ammonia concentration of the condensate in condensate line 2 monitored by the first ammonia concentration monitor 10
  • CfeedNH3 ( mg/L) is the ammonia concentration of the feed water in the feed water line 5 that meets the water supply requirements (pH value).
  • the required ammonia concentration change ⁇ C NH3 for the condensate in condensate line 2 to meet the water supply requirements is calculated by monitoring the ammonia concentration CcondensedNH3 in the condensate line 2 .
  • the frequency of the second metering pump 8 is adjusted so that the ammonia concentration in the water in the water supply pipeline 5 meets the water supply requirement (pH value), and the frequency adjustment value f of the second metering pump 8 satisfies the following first formula:
  • the frequency value of the absolute value of the frequency f of the second metering pump 8 is increased to increase the drainage flow of the second metering pump 8, thereby increasing the ammonia concentration of the water in the water supply pipeline 5.
  • the frequency value of the absolute value of the frequency f of the second metering pump 8 is reduced to reduce the drainage flow of the second metering pump 8, thereby The ammonia concentration of the feed water in the feed water pipeline 5 can be reduced.
  • the discharge flow rate of the second metering pump 8 is changed by changing the condensate flow rate.
  • the discharge flow rate of the second metering pump 8 increases; when the condensate flow rate decreases, the discharge flow rate of the second metering pump 8 decreases.
  • the discharge flow rate of the second metering pump 8 is positively correlated with the operating frequency.
  • the specific frequency of change of the second metering pump 8 can be determined, thereby making the flow rate change of the second metering pump 8 more accurate, thereby facilitating the adjustment of the ammonia concentration value of the feed water and, in turn, the pH value of the feed water.
  • the method for controlling the addition of ammonia to boiler feed water when the condensate flow rate varies according to the present application has the advantage of facilitating real-time and accurate adjustment of the pH value of the feed water.
  • a third ammonia concentration monitor 12 is provided on the feed water pipeline 5.
  • the method for controlling the addition of ammonia to boiler feed water when the condensate flow rate varies includes steps S4 and S5.
  • step S4 the third ammonia concentration monitor 12 is used to monitor the ammonia concentration value CmeasuredNH3 of the feed water in the water supply pipeline 5. If the difference between the ammonia concentration value CmeasuredNH3 monitored by the third ammonia concentration monitor 12 and the required ammonia concentration value CgivenNH3 in the feed water in the water supply pipeline 5 is within a first preset range, it is determined that the ammonia concentration value in the feed water in the water supply pipeline 5 meets the water supply requirements.
  • step S5 the monitoring data of the third ammonia concentration monitor 12 is used to obtain the pH value of the feed water in the water supply pipeline 5, thereby determining whether the pH value of the feed water meets the requirement.
  • the first ammonia concentration monitor 10 , the second ammonia concentration monitor 11 , and the third ammonia concentration monitor 12 are all conductivity meters.
  • C NH3 is the ammonia concentration in the liquid
  • SC is the conductivity of the liquid monitored by the conductivity meter.
  • the third ammonia concentration monitor 12 is used to monitor the conductivity of the water in the water supply pipeline, and the ammonia concentration of the water in the water supply pipeline can be determined according to the conductivity of the water in the water supply pipeline.
  • the ammonia concentration value of the feed water in the water supply pipe 5 can be obtained by substituting the conductivity value of the feed water in the water supply pipe 5 into the third formula.
  • a first flow meter 13 is provided on the condensate pipe 2.
  • the first flow meter 13 is used to monitor the change in the flow rate of the condensate in the condensate pipe 2 , ⁇ Qcondensate .
  • the first flow meter 13 can monitor the flow rate in the condensate pipe 2 and the change in flow rate per unit time.
  • a second flow meter 14 is provided on the ammonia liquid pipeline 4.
  • the second flow meter 14 is used to monitor the change in flow rate of the ammonia solution in the ammonia liquid pipeline 4, ⁇ Q .
  • the second flow meter 14 can monitor the flow rate in the ammonia liquid pipeline 4 and the change in flow rate per unit time.
  • first and second are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as “first” or “second” may explicitly or implicitly include at least one of such features.
  • plural means at least two, for example, two, three, etc., unless otherwise specifically defined.
  • a first feature can be “above” or “below” a second feature. This means that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary.
  • the phrase “above,””above,” and “above” a first feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature.
  • the phrase “below,””below,” and “below” a first feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.
  • the terms “one embodiment”, “some embodiments”, “examples”, “specific examples”, or “some examples” mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application.
  • the schematic representations of the above terms do not necessarily refer to the same embodiment or example.
  • the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
  • those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Control Of Non-Electrical Variables (AREA)
  • Removal Of Specific Substances (AREA)

Abstract

本申请涉及凝结水流量变动时锅炉给水加氨控制方法,该方法基于锅炉给水加氨系统,锅炉给水加氨系统包括凝汽器、凝结水管路、氨液管路、氨液计量箱和给水管路,凝结水管路上设有凝结水泵,氨液管路上设有第二计量泵,第二计量泵为变频泵;凝结水流量变动时锅炉给水加氨控制方法包括以下步骤:S1、在氨液计量箱中配置氨浓度为C NH3的氨溶液,确定第二计量泵每Hz频率变动下的流量变化值q;S2、确定凝结水管路中的凝结水的流量的变化值△Q,确定凝结水管路中的凝结水达到满足给水要求的所需的氨浓度变化值△CNH3;S3、对第二计量泵的频率进行调节。因此,本申请的凝结水流量变动时锅炉给水加氨控制方法具有便于实时、准确调节给水的pH值的优点。

Description

一种凝结水流量变动时锅炉给水加氨控制方法
相关申请的交叉引用
本申请要求在2024年3月29日提交中国专利局、申请号为202410378082.7、发明名称为“一种凝结水流量变动时锅炉给水加氨控制方法”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
技术领域
本申请涉及锅炉给水技术领域,具体涉及一种凝结水流量变动时锅炉给水加氨控制方法。
背景技术
锅炉给水pH控制是电厂化学系统中的重要部分,通过向给水管道内加入氨水,提高给水的pH值,是防止给水对金属腐蚀的最经济实用的办法。相关技术中,电厂由于锅炉负荷变动时凝汽器排出的凝结水流量会变化,如果不及时准确的调节增量凝结水的氨加入量会使得加入锅炉给水的pH值不能达到设定值、不稳定,不符合给水要求。
发明内容
本申请旨在至少在一定程度上解决相关技术中的技术问题之一。为此,本申请的实施例提出一种凝结水流量变动时锅炉给水加氨控制方法。
本申请实施例凝结水流量变动时锅炉给水加氨控制方法,基于锅炉给水加氨系统,所述锅炉给水加氨系统包括凝汽器、凝结水管路、氨液管路、氨液计量箱和给水管路,所述凝汽器的出口通过所述凝结水管路与所述给水管路的进口连通,所述氨液计量箱的出口通过所述氨液管路与所述给水管路的进口连通,所述给水管路的出口与锅炉的进水口连通,所述凝结水管路上设有凝结水泵,所述氨液管路上设有第二计量泵,所述第二计量泵为变频泵;
所述凝结水流量变动时锅炉给水加氨控制方法包括以下步骤:
S1、在所述氨液计量箱中配置氨浓度为C NH3的氨溶液,确定所述第二计量泵每Hz频率变动下的流量变化值q;
S2、确定所述凝结水管路中的凝结水的流量的变化值△Q,确定所述凝结水管路中的凝结水达到满足给水要求的所需的氨浓度变化值△CNH3
S3、通过对所述第二计量泵的频率进行调节以使得所述给水管路中给水中的氨浓度值符合给水要求,且所述第二计量泵的频率调节值f满足以下第一公式:
第一公式中:f为所述第二计量泵的频率调节值,△CNH3为所述凝结水管路中的凝结水达到满足给水要求的所需的氨浓度变化值,△Q为所述凝结水管路中的凝结水的流量的变化量值,q为所述第二计量泵每Hz频率变动下的流量变化值,C NH3为所述氨液计量箱中的氨溶液的氨浓度值。
因此,根据本申请的凝结水流量变动时锅炉给水加氨控制方法具有便于实时、准确调节给水的pH值的优点。
在一些实施例中,所述凝结水管路上设有第一氨浓度监测器;
在所述步骤S1中,满足给水要求的氨浓度值为C NH3
在所述步骤S2中,利用所述第一氨浓度监测器监测所述凝结水管路中的凝结水的氨浓度值为C NH3,其中,所述凝结水管路中的凝结水达到满足给水要求的所需的氨浓度变化值△CNH3满足以下第二公式:
△CNH3=C NH3-C NH3
第二公式中:△CNH3为所述凝结水管路中的凝结水达到满足给水要求的所需的氨浓度变化值,C NH3为用所述第一氨浓度监测器监测所述凝结水管路中的凝结水的氨浓度值,C NH3为所述给水管路中的满足给水要求的给水的氨浓度值。
在一些实施例中,所述氨液计量箱上设有第二氨浓度监测器;
在所述步骤S1中,利用所述第二氨浓度监测器监测所述氨液计量箱中的氨溶液的氨浓度值,以便在所述氨液计量箱中配置氨浓度为C NH3的氨溶液。
在一些实施例中,所述给水管路上设有第三氨浓度监测器;
所述凝结水流量变动时锅炉给水加氨控制方法包括
S4、利用所述第三氨浓度监测器监测所述给水管路中给水的氨浓度值C NH3,若所述第三氨浓度监测器监测出的氨浓度值C NH3与所述给水管路中的给水中的氨浓度的要求值C NH3的差值在第一预设范围内,则判断所述给水管路中的给水中的氨浓度值满足给水要求;
S5、利用所述第三氨浓度监测器的监测数据以便得到所述给水管路中给水的pH值。
在一些实施例中,所述第一氨浓度监测器、所述第二氨浓度监测器和所述第三氨浓度监测器均为电导表;
所述第一氨浓度监测器用于监测所述凝结水管路中的凝结水的电导率,可根据所述凝结水管路中的凝结水的电导率确定所述凝结水管路中的凝结水的氨浓度;
所述第二氨浓度监测器用于监测所述氨液计量箱中的氨溶液的电导率,可根据所述氨 液计量箱中的氨溶液的电导率确定所述氨液计量箱中的氨溶液的氨浓度;
所述第三氨浓度监测器用于监测所述给水管路中的给水的电导率,可根据所述给水管路中的给水的电导率确定所述给水管路中的给水的氨浓度;
液体中氨浓度值与电导率值SC满足以下第三公式:
CNH3=(13.2×SC2+62.7×SC)×10-3
第三公式中:CNH3为液体中的氨浓度,SC为电导表监测出液体的电导率。
在一些实施例中,所述第二计量泵的频率调节值f计算过程中包括以下公式:
第四公式:
△CNH3×△Q=△Q×C NH3
第五公式:
f=△Q÷q
在第四公式和第五公式中:△Q为所述第二计量泵的排出的流量变化值。
在一些实施例中,所述凝结水管路上设有第一流量计;
在所述步骤S2中,利用所述第一流量计监测所述凝结水管路中的凝结水的流量的变化值△Q
所述氨液管路上设有第二流量计;
在所述步骤S2中,利用所述第二流量计监测所述氨液管路中的氨溶液的流量的变化值△Q
在一些实施例中,所述锅炉给水加氨系统包括
除氧器,所述除氧器的进口与所述给水管路的出口连通;
第四管路,所述第四管路的进口与所述除氧器的出口连通,所述第四管路上设有第三泵体,所述第四管路的出口与所述锅炉的进水口连通。
在一些实施例中,所述锅炉给水加氨系统包括
第一加热器,所述第一加热器设在所述给水管路上;
第二加热器,所述第二加热器设在所述第四管路上。
在一些实施例中,所述凝结水管路包括并联的第一支路和第二支路,所述第一支路上设有阀门,所述第二支路上设有精处理装置。
附图说明
图1是根据本申请实施例的锅炉给水加氨系统的示意图。
附图标记:1、凝汽器,2、凝结水管路,3、氨液计量箱,4、氨液管路,5、给水管路,6、第四管路,7、凝结水泵,8、第二计量泵,9、第三泵体,10、第一氨浓度监测器,11、第二氨浓度监测器,12、第三氨浓度监测器,13、第一流量计,14、第二流量计,15、除 氧器,16、第一加热器,17、第一支路,18、第二支路,19、阀门,20、精处理装置,21、第二加热器,22、锅炉。
具体实施方式
下面详细描述本申请的实施例,所述实施例的示例在附图中示出。下面通过参考附图描述的实施例是示例性的,旨在用于解释本申请,而不能理解为对本申请的限制。
下面参考附图描述本申请实施例的凝结水流量变动时锅炉给水加氨控制方法。如图1所示,根据本申请实施例的一种凝结水流量变动时锅炉给水加氨控制方法基于锅炉给水加氨系统。
锅炉给水加氨系统包括凝汽器1、凝结水管路2、氨液管路4、氨液计量箱3、给水管路5、除氧器15、第四管路6、第一加热器16和第二加热器21。
凝汽器1的出口通过凝结水管路2与给水管路5的进口连通,凝结水管路2上设有凝结水泵7,从而可使得凝汽器1排出的凝结水可通入给水管路5内。
氨液计量箱3的出口通过氨液管路4与给水管路5的进口连通,氨液管路4上设有第二计量泵8,第二计量泵8为变频泵,可通过第二计量泵8的频率改变第二计量泵8排出的流量。从而可使得氨液计量箱3内的氨溶液通入给水管路5中,以便调节给水管路5中给水的氨浓度,从而调节锅炉22给水的pH值,给水管路5的出口与锅炉22的进水口连通。第二计量泵8(变频泵)的排水流量与工作频率的大小正相关,且调节较为方便、精确,从而可准确调节给水管路5中给水的氨浓度,进而准确调节给水的pH值。
除氧器15的进口与给水管路5的出口连通。第四管路6的进口与除氧器15的出口连通,第四管路6上设有第三泵体9,第四管路6的出口与锅炉22的进水口连通。由此,可使得给水管路5排出的给水通入除氧器15内去除氧气,然后再通过第四管路6通入锅炉22内。
第一加热器16设在给水管路5上,第二加热器21设在第四管路6上。具体地,第一加热器16为低压加热器,第二加热器21为高压加热器。
如图1所示,凝结水管路2包括并联的第一支路17和第二支路18,第一支路17上设有阀门19,第二支路18上设有精处理装置20。从而可使得阀门19关闭第一支路17时,凝结水可通过第二支路18通入精处理装置20,以便去除凝结水中的杂质。
由此,根据本申请的锅炉给水加氨系统具有便于实时、准确调节给水的pH值优点。
根据本申请的一种凝结水流量变动时锅炉给水加氨控制方法包括以下步骤。
S1、在氨液计量箱3中配置氨浓度为C NH3的氨溶液。确定第二计量泵8每Hz频率变动下的流量变化值q。具体地,可通过试验获得第二计量泵8固定行程下每Hz频率变动下的出力(流量)。
在一些实施例中,氨液计量箱3上设有第二氨浓度监测器11。
在步骤S1中,利用第二氨浓度监测器11监测氨液计量箱3中的氨溶液的氨浓度值,以便在氨液计量箱3中配置氨浓度为C NH3的氨溶液。具体地,可根据第二氨浓度监测器11监测的数值调节氨液计量箱3内的氨溶液的氨浓度,以便氨液计量箱3内的氨溶液的氨浓度为C NH3
在步骤S1中,满足给水要求的氨浓度值为C NH3,具体地,根据给水要求的pH值,设定满足给水要求(pH值)的氨浓度值C NH3
S2、确定凝结水管路2中的凝结水的流量的变化值△Q,确定凝结水管路2中的凝结水达到满足给水要求(pH值)的所需的氨浓度变化值△CNH3
在一些实施例中,凝结水管路2上设有第一氨浓度监测器10。在步骤S2中,利用第一氨浓度监测器10监测凝结水管路2中的凝结水的氨浓度值为C NH3
其中,凝结水管路2中的凝结水达到满足给水要求(pH值)的所需的氨浓度变化值△CNH3满足以下第二公式:△CNH3=C NH3-C NH3。第二公式中:△CNH3(mg/L)凝结水管路2中的凝结水达到满足给水要求的所需的氨浓度变化值,C NH3(mg/L)为用第一氨浓度监测器10监测凝结水管路2中的凝结水的氨浓度值,C NH3(mg/L)为给水管路5中的满足给水要求(pH值)的给水的氨浓度值。也就是说,通过监测凝结水管路2中的凝结水的氨浓度值C NH3计算凝结水管路2中的凝结水达到满足给水要求的所需的氨浓度变化值△CNH3
S3、通过对第二计量泵8的频率进行调节以使得给水管路5中给水中的氨浓度值符合给水要求(pH值),且第二计量泵8的频率调节值f满足以下第一公式:
第一公式中:f(Hz)为第二计量泵8的频率调节值,△CNH3(mg/L)为凝结水管路2中的凝结水达到满足给水要求(pH值)的所需的氨浓度变化值,△Q(L/h)为凝结水管路2中的凝结水的流量的变化量值,q[(L/h)·(Hz)]为第二计量泵8每Hz频率变动下的流量变化值,C NH3(mg/L)为氨液计量箱3中的氨溶液的氨浓度值。
△CNH3=C NH3-C NH3。由此,可进一步得到第二计量泵8的频率调节值f满足以下公式:
具体地,f的数值为正值时,增大第二计量泵8的频率f的绝对值的频率值,以便增加第二计量泵8的排水流量,从而可增加给水管路5中给水的氨浓度。f的数值为负值时,降低第二计量泵8的频率f的绝对值的频率值,以便降低第二计量泵8的排水流量,从而 可降低给水管路5中给水的氨浓度。根据本申请的凝结水流量变动时锅炉给水加氨控制方法通过冷凝水的流量变动,从而改变第二计量泵8的排出的流量的变动。冷凝水的流量增加时,第二计量泵8的排出的流量增大;冷凝水的流量降低时,第二计量泵8的排出的流量减小。且第二计量泵8的排出流量与工作频率正相关,可确定第二计量泵8的具体变化频率,从而可使得第二计量泵8的流量改变更加准确,以便于调节给水的氨浓度值,进而调节给水的pH值。
因此,根据本申请的一种凝结水流量变动时锅炉给水加氨控制方法具有便于实时、准确调节给水的pH值的优点。
如图1所示,在一些实施例中,给水管路5上设有第三氨浓度监测器12。凝结水流量变动时锅炉给水加氨控制方法包括步骤S4和步骤S5。
在步骤S4中,利用第三氨浓度监测器12监测给水管路5中给水的氨浓度值C NH3,若第三氨浓度监测器12监测出的氨浓度值C NH3与给水管路5中的给水中的氨浓度的要求值C NH3的差值在第一预设范围内,则判断给水管路5中的给水中的氨浓度值满足给水要求。
在步骤S5中,利用第三氨浓度监测器12的监测数据以便得到给水管路5中给水的pH值。从而判断给水的pH值是否达到要求。
在一些实施例中,第一氨浓度监测器10、第二氨浓度监测器11和第三氨浓度监测器12均为电导表。
25℃机组水汽工质的pH值与电导率(SC·μS/cm)存在计算关系:pH=8.57+lgSC,从而可根据第三氨浓度监测器12监测给水管路5中的给水的电导率以便得到给水的pH值。
液体中氨浓度值与电导率值SC满足以下第三公式:
CNH3=(13.2×SC2+62.7×SC)×10-3
第三公式中:CNH3为液体中的氨浓度,SC为电导表监测出液体的电导率。
第一氨浓度监测器10用于监测凝结水管路2中的凝结水的电导率,可根据凝结水管路2中的凝结水的电导率确定凝结水管路2中的凝结水的氨浓度。即第一氨浓度监测器10监测出的凝结水的电导率的数值带入第三公式中可得凝结水管路2中的凝结水的氨浓度值C NH3
第二氨浓度监测器11用于监测氨液计量箱3中的氨溶液的电导率,可根据氨液计量箱3中的氨溶液的电导率确定氨液计量箱3中的氨溶液的氨浓度。即第二氨浓度监测器11监测出的氨液计量箱3内的氨溶液的电导率的数值带入第三公式中可得氨液计量箱3内的氨溶液的氨浓度值。
如图1所示,第三氨浓度监测器12用于监测给水管路中的给水的电导率,可根据给水管路中的给水的电导率确定给水管路中的给水的氨浓度。即第三氨浓度监测器12监测出的 给水管路5中给水的电导率的数值带入第三公式中可得给水管路5中的给水中的氨浓度的氨浓度值。
在一些实施例中,第二计量泵8的频率调节值f计算过程中包括以下公式:
第四公式:
△CNH3×△Q=△Q×C NH3
第五公式:
f=△Q÷q
在第四公式和第五公式中:△Q(L/h)为第二计量泵8的排出的流量变化值。具体地,第四公式可计算出需要增加或减少的药量△MNH3(mg/h)。第五公式为第二计量泵8的流量变化值和频率变化值之间的关系。
在一些实施例中,凝结水管路2上设有第一流量计13。在步骤S2中,利用第一流量计13监测凝结水管路2中的凝结水的流量的变化值△Q。具体地,第一流量计13可监测凝结水管路2内的流量和单位时间内的流量变化。
在一些实施例中,氨液管路4上设有第二流量计14。在步骤S2中,利用第二流量计14监测氨液管路4中的氨溶液的流量的变化值△Q。具体地,第二流量计14可监测氨液管路4内的流量和单位时间内的流量变化。
在本申请的描述中,需要理解的是,术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为了便于描述本申请和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本申请的限制。
此外,术语“第一”、“第二”仅用于描述目的,而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此,限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本申请的描述中,“多个”的含义是至少两个,例如两个,三个等,除非另有明确具体的限定。
在本申请中,除非另有明确的规定和限定,术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解,例如,可以是固定连接,也可以是可拆卸连接,或成一体;可以是机械连接,也可以是电连接或彼此可通讯;可以是直接相连,也可以通过中间媒介间接相连,可以是两个元件内部的连通或两个元件的相互作用关系,除非另有明确的限定。对于本领域的普通技术人员而言,可以根据具体情况理解上述术语在本申请中的具体含义。
在本申请中,除非另有明确的规定和限定,第一特征在第二特征“上”或“下”可 以是第一和第二特征直接接触,或第一和第二特征通过中间媒介间接接触。而且,第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方,或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方,或仅仅表示第一特征水平高度小于第二特征。
在本申请中,术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本申请的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外,在不相互矛盾的情况下,本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
尽管已经示出和描述了上述实施例,可以理解的是,上述实施例是示例性的,不能理解为对本申请的限制,本领域普通技术人员对上述实施例进行的变化、修改、替换和变型均在本申请的保护范围内。

Claims (10)

  1. 一种凝结水流量变动时锅炉给水加氨控制方法,其特征在于,基于锅炉给水加氨系统,所述锅炉给水加氨系统包括凝汽器、凝结水管路、氨液管路、氨液计量箱和给水管路,所述凝汽器的出口通过所述凝结水管路与所述给水管路的进口连通,所述氨液计量箱的出口通过所述氨液管路与所述给水管路的进口连通,所述给水管路的出口与锅炉的进水口连通,所述凝结水管路上设有凝结水泵,所述氨液管路上设有第二计量泵,所述第二计量泵为变频泵;
    所述凝结水流量变动时锅炉给水加氨控制方法包括以下步骤:
    S1、在所述氨液计量箱中配置氨浓度为C NH3的氨溶液,确定所述第二计量泵每Hz频率变动下的流量变化值q;
    S2、确定所述凝结水管路中的凝结水的流量的变化值△Q,确定所述凝结水管路中的凝结水达到满足给水要求的所需的氨浓度变化值△CNH3
    S3、通过对所述第二计量泵的频率进行调节以使得所述给水管路中给水中的氨浓度值符合给水要求,且所述第二计量泵的频率调节值f满足以下第一公式:
    第一公式中:f为所述第二计量泵的频率调节值,△CNH3为所述凝结水管路中的凝结水达到满足给水要求的所需的氨浓度变化值,△Q为所述凝结水管路中的凝结水的流量的变化量值,q为所述第二计量泵每Hz频率变动下的流量变化值,C NH3为所述氨液计量箱中的氨溶液的氨浓度值。
  2. 根据权利要求1所述的凝结水流量变动时锅炉给水加氨控制方法,其特征在于,
    所述凝结水管路上设有第一氨浓度监测器;
    在所述步骤S1中,满足给水要求的氨浓度值为C NH3
    在所述步骤S2中,利用所述第一氨浓度监测器监测所述凝结水管路中的凝结水的氨浓度值为C NH3,其中,所述凝结水管路中的凝结水达到满足给水要求的所需的氨浓度变化值△CNH3满足以下第二公式:
    △CNH3=C NH3-C NH3
    第二公式中:△CNH3为所述凝结水管路中的凝结水达到满足给水要求的所需的氨浓度变化值,C NH3为用所述第一氨浓度监测器监测所述凝结水管路中的凝结水的氨浓度值,C NH3为所述给水管路中的满足给水要求的给水的氨浓度值。
  3. 根据权利要求2所述的凝结水流量变动时锅炉给水加氨控制方法,其特征在于,
    所述氨液计量箱上设有第二氨浓度监测器;
    在所述步骤S1中,利用所述第二氨浓度监测器监测所述氨液计量箱中的氨溶液的氨浓度值,以便在所述氨液计量箱中配置氨浓度为C NH3的氨溶液。
  4. 根据权利要求3所述的凝结水流量变动时锅炉给水加氨控制方法,其特征在于,
    所述给水管路上设有第三氨浓度监测器;
    所述凝结水流量变动时锅炉给水加氨控制方法包括
    S4、利用所述第三氨浓度监测器监测所述给水管路中给水的氨浓度值C NH3,若所述第三氨浓度监测器监测出的氨浓度值C NH3与所述给水管路中的给水中的氨浓度的要求值C NH3的差值在第一预设范围内,则判断所述给水管路中的给水中的氨浓度值满足给水要求;
    S5、利用所述第三氨浓度监测器的监测数据以便得到所述给水管路中给水的pH值。
  5. 根据权利要求4所述的凝结水流量变动时锅炉给水加氨控制方法,其特征在于,
    所述第一氨浓度监测器、所述第二氨浓度监测器和所述第三氨浓度监测器均为电导表;
    所述第一氨浓度监测器用于监测所述凝结水管路中的凝结水的电导率,可根据所述凝结水管路中的凝结水的电导率确定所述凝结水管路中的凝结水的氨浓度;
    所述第二氨浓度监测器用于监测所述氨液计量箱中的氨溶液的电导率,可根据所述氨液计量箱中的氨溶液的电导率确定所述氨液计量箱中的氨溶液的氨浓度;
    所述第三氨浓度监测器用于监测所述给水管路中的给水的电导率,可根据所述给水管路中的给水的电导率确定所述给水管路中的给水的氨浓度;
    液体中氨浓度值与电导率值SC满足以下第三公式:
    CNH3=(13.2×SC2+62.7×SC)×10-3
    第三公式中:CNH3为液体中的氨浓度,SC为电导表监测出液体的电导率。
  6. 根据权利要求5所述的凝结水流量变动时锅炉给水加氨控制方法,其特征在于,
    所述第二计量泵的频率调节值f计算过程中包括以下公式:
    第四公式:
    △CNH3×△Q=△Q×C NH3
    第五公式:
    f=△Q÷q
    在第四公式和第五公式中:△Q为所述第二计量泵的排出的流量变化值。
  7. 根据权利要求6所述的凝结水流量变动时锅炉给水加氨控制方法,其特征在于,
    所述凝结水管路上设有第一流量计;
    在所述步骤S2中,利用所述第一流量计监测所述凝结水管路中的凝结水的流量的变化 值△Q
    所述氨液管路上设有第二流量计;
    在所述步骤S2中,利用所述第二流量计监测所述氨液管路中的氨溶液的流量的变化值△Q
  8. 根据权利要求1-7任一项所述的凝结水流量变动时锅炉给水加氨控制方法,其特征在于,所述锅炉给水加氨系统包括
    除氧器,所述除氧器的进口与所述给水管路的出口连通;
    第四管路,所述第四管路的进口与所述除氧器的出口连通,所述第四管路上设有第三泵体,所述第四管路的出口与所述锅炉的进水口连通。
  9. 根据权利要求8所述的凝结水流量变动时锅炉给水加氨控制方法,其特征在于,所述锅炉给水加氨系统包括
    第一加热器,所述第一加热器设在所述给水管路上;
    第二加热器,所述第二加热器设在所述第四管路上。
  10. 根据权利要求8所述的凝结水流量变动时锅炉给水加氨控制方法,其特征在于,所述凝结水管路包括并联的第一支路和第二支路,所述第一支路上设有阀门,所述第二支路上设有精处理装置。
PCT/CN2024/093275 2024-03-29 2024-05-15 一种凝结水流量变动时锅炉给水加氨控制方法 Pending WO2025200093A1 (zh)

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