CN102661975B - Method and device for continuously monitoring flue gas acid dew point at tail part of coal burning boiler on line - Google Patents

Method and device for continuously monitoring flue gas acid dew point at tail part of coal burning boiler on line Download PDF

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CN102661975B
CN102661975B CN 201210118755 CN201210118755A CN102661975B CN 102661975 B CN102661975 B CN 102661975B CN 201210118755 CN201210118755 CN 201210118755 CN 201210118755 A CN201210118755 A CN 201210118755A CN 102661975 B CN102661975 B CN 102661975B
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flue gas
dew point
acid dew
burning boiler
continuous monitoring
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CN102661975A (en
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沈煜晖
李超
李建浏
金颖姗
付丽辉
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China Huadian Engineering Group Co Ltd
Huadian Environmental Protection Engineering and Technology Co Ltd
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Huadian Environmental Protection Engineering and Technology Co Ltd
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Abstract

The invention discloses a method and a device for continuously monitoring a flue gas acid dew point at the tail part of a coal burning boiler on line. The method comprises the following steps: S1, to-be-detected flue gas at the tail part of the coal burning boiler is cooled to 0 to 4 DEG C in a rapid cooling manner through a flue gas condenser, condensed water is collected and a PH meter is used for measuring the PH value of the condensed water; S3, a flue gas hygrometer is used for measuring the moisture of the flue gas before entering the condenser; and S4, the volume ratio of SO3 to H2O in the flue gas, the volume content of SO3 and a flue gas acid dew point are calculated. According to the invention, the measurement result is converted through an automatic measuring instrument (including the PH meter, the flue gas hygrometera and the signal transmitting device) into electrical signals to be sent to an on-line monitoring system, and the flue gas acid dew point is obtained by calculation and treatment of the system. Therefore, on-line continuous monitoring is achieved, the operation in the entire process is convenient, and the measurement result is accurate; and the data processing speed is fast, and parameters can be provided for on-line control on an industrial device.

Description

A kind of method and device of on-line continuous monitoring coal-burning boiler tail flue gas acid dew point
Technical field
The present invention relates to a kind of method and device of on-line continuous monitoring coal-burning boiler tail flue gas acid dew point, belong to the atmospheric cleaning environmental technology field.
Background technology
Contain a certain amount of SO in the coal-burning boiler tail flue gas 3, they very easily with flue gas in water vapor condense and generate H 2sO 4steam, be near or below on the heating surface of acid dew point or metal material surface and condense in temperature, causes acid corrosion, limited the recycling of low-temperature flue gas waste heat.Therefore, on-line continuous detects flue gas acid dew point and can provide important control parameter to low-temperature flue gas waste heat utilization and the continuous safety in production of coal-burning boiler.
Traditional acid dew point defines two kinds of methods: theoretical calculating and use acid dew point instrument.Theoretical calculation is by determining SO in flue gas 3with the content of water vapour, use generally acknowledged experimental formula in industry to calculate flue gas acid dew point.Traditional flue gas SO 3content test method (GB/T21506-2006 appendix C) is used special-purpose gas sampling system to carry out the isokinetic sampling to flue gas, uses the content of sulfate radical in the chemical method analytic sample and is scaled SO in flue gas with this 3concentration.The method test result is comparatively accurate, but measure, process operation is complicated, workload is large, consuming time longer, can't accomplish the on-line continuous monitoring.
Acid dew point instrument measuring principle has been utilized the conductive characteristic of acid solution: probe is inserted to flue, and when probe temperature is down to acid dew point, detecting probe surface meeting dewfall, the two interelectrode conductive characteristics that are positioned at detecting probe surface will change thereupon.The acid dew point instrument is using the variation of inter-electrode voltage or electric current as the foundation of judging the probe dewfall, and while measuring dewfall, the temperature of probe is as flue gas acid dew point.The actual measurement of acid dew point instrument be the curve that between probe electrode, voltage or electric current change with probe temperature, the difference of understanding for curve can affect the judgement of smoke condensation, thereby directly affects the measurement result of acid dew point; Simultaneously, in the coal-burning boiler tail flue gas, the impurity such as flying dust is also very large on the impact of the measurement result of acid dew point instrument, thereby uses the accuracy of the result data that the acid dew point instrument measures lower; Due to the restriction of acid dew point instrument measuring principle, the acid dew point instrument can not carry out continuous on-line monitoring in addition, can not provide parameter for the On-line Control of commercial plant.
Summary of the invention
The object of the invention is to, a kind of method and device of on-line continuous monitoring coal-burning boiler tail flue gas acid dew point are provided, not only simple to operation, DATA REASONING speed is fast for it, the DATA REASONING result is accurate, and it can also realize on-line continuous monitoring, for the On-line Control of commercial plant provides parameter.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of method of on-line continuous monitoring coal-burning boiler tail flue gas acid dew point comprises the following steps:
S1, flue gas condenser is cooled to 0～4 ℃ in cooling rapidly mode by coal-burning boiler tail flue gas to be measured;
S2, collect the condensate water of discharging and utilize pH meter to measure the pH value of this condensate water;
S3, smoke moisture instrumentation amount enters the humidity of the flue gas before condenser;
S4, calculate SO in flue gas 3with H 2the volume ratio of O, SO 3volume content and flue gas acid dew point.
In the method for aforesaid on-line continuous monitoring coal-burning boiler tail flue gas acid dew point, described method also comprises: S0, filtered coal-burning boiler tail flue gas to be measured.
In the method for aforesaid on-line continuous monitoring coal-burning boiler tail flue gas acid dew point, step S2, adopt airtight container to collect the condensate water of discharging.
A kind of device of realizing the on-line continuous monitoring coal-burning boiler tail flue gas acid dew point of preceding method, comprising: flue gas condenser, peristaltic pump, container, pH meter, flue gas on-line continuous monitoring system, smoke moisture meter and signal transmitting apparatus; Flue gas condenser is provided with air intake opening, gas outlet and condensation-water drain, peristaltic pump is connected with container with condensation-water drain respectively by silicone tube, pH meter is located in container, signal transmitting apparatus is located in flue gas on-line continuous monitoring system, and signal transmitting apparatus is connected with the smoke moisture meter with pH meter respectively.
In the device of aforesaid on-line continuous monitoring coal-burning boiler tail flue gas acid dew point, also comprise: filtrator, filtrator is connected with the smoke moisture meter with flue gas condenser respectively.
In the device of aforesaid on-line continuous monitoring coal-burning boiler tail flue gas acid dew point, described container is airtight container.
Compared with prior art, the present invention is according to the characteristics of coal-burning boiler tail flue gas, and creationary proposition utilizes quench to obtain flue gas condensing solution, wherein, by flue gas condenser, in cooling rapidly mode, flue gas is cooled to 0～4 ℃; When flue gas being cooled to lower than 0 ℃, water vapour can freeze, and causes measuring the pH value of solution and calculates SO in the coal-burning boiler tail flue gas 3steam and water vapor mol ratio; When flue gas being cooled to higher than 4 ℃, most of flue gas is still gaseous state, thereby can't be by moisture and SO 3composition is separated with other compositions; When flue gas is cooled to 0～4 ℃, in flue gas, 95% water vapor can be condensed into liquid state, the water vapor in temperature-fall period in flue gas and SO 3steam is because supersaturation is condensed into liquid state, thereby realized moisture, SO 3composition and other component separating; By measuring the pH value of gained condensing soln, calculate SO in the coal-burning boiler tail flue gas again 3steam and water vapor mol ratio, in conjunction with hygrometer gained moisture content of flue gas adopting, obtain SO in flue gas 3with the content of water, calculate accordingly and obtain flue gas acid dew point.The present invention is simple to operation, and measurement result avoided the distracter that may exist in the coal-burning boiler tail flue gas as much as possible, uses generally acknowledged theoretical formula in industry, and measurement result is accurate; Use the equipment of robotization to measure calculating, data processing speed is fast; In addition, the present invention changes measurement result into electric signal by automatic measuring instrument (comprise pH meter, smoke moisture take into account signal transmitting apparatus) and imports flue gas on-line continuous monitoring system into, process and obtain flue gas acid dew point by system-computed, thereby realize the on-line continuous monitoring, can provide parameter for the On-line Control of commercial plant.According to the mass data statistics, show, after adopting the present invention, the DATA REASONING cycle is from dozens of minutes within several hours, foreshortening to real-time demonstration result.In addition, the present invention is also filtered flue gas to be measured by filtrator, can filter out the particle in flue gas, has avoided alkaline matter or the acidic materials in the particle to affect measurement result, has avoided particle to stop up condenser simultaneously.Finally, the container described in the present invention is airtight container, thereby the impact that can avoid the soluble gas composition that may exist in air to measure sulfur trioxide content has further improved the precision of DATA REASONING.
The accompanying drawing explanation
Fig. 1 is the method flow diagram of a kind of embodiment of the present invention;
Fig. 2 is the structural representation of a kind of embodiment of the present invention.
Reference numeral: 1-flue gas condenser, 2-peristaltic pump, 3-container, 4-pH meter, 5-flue gas on-line continuous monitoring system, 6-smoke moisture meter, 7-signal transmitting apparatus, 8-filtrator.
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.
Embodiment
Embodiments of the invention 1: a kind of method of on-line continuous monitoring coal-burning boiler tail flue gas acid dew point as shown in Figure 1, comprising: coal-burning boiler tail flue gas to be measured is filtered; Flue gas condenser is cooled to 0 ℃ in cooling rapidly mode by the flue gas after filtering; Airtight container is collected the condensate water of discharging and is utilized pH meter to measure the pH value of this condensate water; By condensate water pH value record, be a; In condensate water, the content of water and sulfuric acid all comes from flue gas, has:
SO in flue gas 3with H 2the volume ratio of O is
V S O 3 / V H 2 O = 10 - a / ( 1000 / 18 ) = 0.018 × 10 - a ;
The humidity data that enters the flue gas before condenser obtained according to the smoke moisture instrumentation, can calculate the SO in flue gas 3volume content:
V SO 3 = 0.018 × 10 - a × V H 2 O ;
And flue gas acid dew point:
T ld = 186 + 20 lg V H 2 O + 26 lg V SO 3 ;
T in formula ldfor flue gas acid dew point,
Figure GDA0000361168990000034
with
Figure GDA0000361168990000035
be respectively the volume content (%) of water and sulfuric anhydride in flue gas.
The formula that calculates acid dew point in this method can adopt other other computing formula based on water vapor and sulfuric anhydride volume content to replace equally.
Realize the device of a kind of on-line continuous monitoring coal-burning boiler tail flue gas acid dew point of said method, as shown in Figure 2, comprising: flue gas condenser 1, peristaltic pump 2, container 3, pH meter 4, flue gas on-line continuous monitoring system 5, smoke moisture meter 6 and signal transmitting apparatus 7; Flue gas condenser 1 is provided with air intake opening, gas outlet and condensation-water drain, peristaltic pump 2 is connected with container 3 with condensation-water drain respectively by silicone tube, pH meter 4 is located in container 3, signal transmitting apparatus 7 is located in flue gas on-line continuous monitoring system 5, and signal transmitting apparatus 7 is connected with smoke moisture meter 6 with pH meter 4 respectively.Described device also comprises: filtrator 8, and filtrator 8 is connected with flue gas condenser 1; Described container 3 is airtight container.
Embodiments of the invention 2: a kind of method of on-line continuous monitoring coal-burning boiler tail flue gas acid dew point as shown in Figure 1, comprising: coal-burning boiler tail flue gas to be measured is filtered; Flue gas condenser is cooled to 4 ℃ in cooling rapidly mode by the flue gas after filtering; Airtight container is collected the condensate water of discharging and is utilized pH meter to measure the pH value of this condensate water; Smoke moisture instrumentation amount enters the humidity of the flue gas before condenser; Calculate SO in flue gas 3with H 2the volume ratio of O, SO 3volume content and flue gas acid dew point.
Realize the device of a kind of on-line continuous monitoring coal-burning boiler tail flue gas acid dew point of said method, as shown in Figure 2, comprising: flue gas condenser 1, peristaltic pump 2, container 3, pH meter 4, flue gas on-line continuous monitoring system 5, smoke moisture meter 6 and signal transmitting apparatus 7; Flue gas condenser 1 is provided with air intake opening, gas outlet and condensation-water drain, peristaltic pump 2 is connected with container 3 with condensation-water drain respectively by silicone tube, pH meter 4 is located in container 3, signal transmitting apparatus 7 is located in flue gas on-line continuous monitoring system 5, and signal transmitting apparatus 7 is connected with smoke moisture meter 6 with pH meter 4 respectively.Described device also comprises: filtrator 8, and filtrator 8 is connected with flue gas condenser 1; Described container 3 is airtight container.

Claims (6)

1. the method for an on-line continuous monitoring coal-burning boiler tail flue gas acid dew point, is characterized in that, comprises the following steps:
S1, flue gas condenser is cooled to 0～4 ℃ in cooling rapidly mode by coal-burning boiler tail flue gas to be measured;
S2, collect the condensate water of discharging and utilize pH meter to measure the pH value of this condensate water;
S3, smoke moisture instrumentation amount enters the humidity of the flue gas before condenser;
S4, calculate SO in flue gas 3with H 2the volume ratio of O, SO 3volume content and flue gas acid dew point, concrete grammar is: SO in flue gas 3with H 2the volume ratio of O is:
V S O 3 / V H 2 O = 0.018 × 10 - a ;
The humidity data that enters the flue gas before condenser obtained according to the smoke moisture instrumentation, calculate SO in flue gas 3volume content be:
V SO 3 = 0.018 × 10 - a × V H 2 O ;
Flue gas acid dew point is:
T ld = 186 + 20 lg V H 2 O + 26 lg V SO 3 ;
In formula, T ldfor flue gas acid dew point,
Figure FDA0000361168980000014
with be respectively the volume content of water and sulfuric anhydride in flue gas.
2. the method for on-line continuous monitoring coal-burning boiler tail flue gas acid dew point according to claim 1, is characterized in that, described method also comprises: S0, filtered coal-burning boiler tail flue gas to be measured.
3. the method for on-line continuous monitoring coal-burning boiler tail flue gas acid dew point according to claim 1 and 2, is characterized in that: in step S2, adopt airtight container to collect the condensate water of discharging.
4. the device of an on-line continuous monitoring coal-burning boiler tail flue gas acid dew point of realizing the described method of claim 1, it is characterized in that, comprising: flue gas condenser (1), peristaltic pump (2), container (3), pH meter (4), flue gas on-line continuous monitoring system (5), smoke moisture meter (6) and signal transmitting apparatus (7); Flue gas condenser (1) is provided with air intake opening, gas outlet and condensation-water drain, peristaltic pump (2) is connected with container (3) with condensation-water drain respectively by silicone tube, pH meter (4) is located in container (3), signal transmitting apparatus (7) is located in flue gas on-line continuous monitoring system (5), and signal transmitting apparatus (7) is connected with smoke moisture meter (6) with pH meter (4) respectively.
5. the device of on-line continuous monitoring coal-burning boiler tail flue gas acid dew point according to claim 4, is characterized in that, also comprise: filtrator (8), filtrator (8) is connected with smoke moisture meter (6) with flue gas condenser (1) respectively.
6. according to the device of the described on-line continuous monitoring of claim 4 or 5 coal-burning boiler tail flue gas acid dew point, it is characterized in that, described container (3) is airtight container.
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CN103364438B (en) * 2013-07-16 2015-02-25 山东大学 Method for determining acid dew point of boiler flue gas engineering
CN104483348B (en) * 2014-12-18 2017-02-22 山东大学 Portable engineering application acid dew point measuring device
CN104833698B (en) * 2015-04-27 2017-10-27 广东电网有限责任公司电力科学研究院 A kind of coal-fired power station boiler flue gas acid dew point detecting system and detection method
CN110412074A (en) * 2019-07-31 2019-11-05 辽宁工程技术大学 A kind of multifunctional coal oxidation characteristic experimental provision and its application method
CN112098461B (en) * 2020-09-24 2021-07-06 上海轻叶能源股份有限公司 Flue gas introducing method online water dew point acid dew point measuring device
CN116705179A (en) * 2023-06-06 2023-09-05 中国电力建设工程咨询有限公司 Method and system for calculating acid dew point of boiler flue gas

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