CN210154871U - Measurement system for monitoring concentration of CO in full section of tail flue of boiler - Google Patents
Measurement system for monitoring concentration of CO in full section of tail flue of boiler Download PDFInfo
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- CN210154871U CN210154871U CN201920676809.4U CN201920676809U CN210154871U CN 210154871 U CN210154871 U CN 210154871U CN 201920676809 U CN201920676809 U CN 201920676809U CN 210154871 U CN210154871 U CN 210154871U
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Abstract
The utility model discloses a measurement system of control boiler afterbody flue full-section CO concentration belongs to coal fired boiler pollutant and measures the field. The utility model discloses carry out the subregion to boiler afterbody flue total cross-section and form a plurality of measurement grids, through arranging at every measurement grid central authorities and measure the thief hole, can detect the CO concentration on the whole cross-section of flue, reduce measuring instrument's configuration, then through the female union coupling of flue gas sample that is located the flue outside. The utility model realizes the detection processes of measurement alternation, purging and the like in each independent sampling main pipe through the switching of the independent sampling main pipe shutoff valve and the independent sampling main pipe purging shutoff valve, has reasonable arrangement structure and saves the system investment cost; and through the control unit, the sampling time, the purging time and the holding time of each independent sampling main pipe are alternated, so that the comprehensive detection of the CO concentration on the section of the whole flue is realized, and the comprehensive monitoring of the combustion working condition in the hearth is facilitated.
Description
Technical Field
The utility model relates to a coal fired boiler pollutant measurement field specifically is a measurement system of control boiler afterbody flue full-section CO concentration.
Background
In order to identify and judge the combustion condition in the boiler of the coal-fired boiler, the smoke components and the carbon content of fly ash and slag after the combustion of the boiler need to be detected, and the common method is to detect O in the tail smoke of the boiler2Content according to O2And (4) further judging the total air volume of the boiler according to the content, and correcting and controlling the total air volume of the boiler.
Due to O in the air2The range of the measured value is 0-21%, the range is small, the monitoring and the control are not facilitated, and when the boiler is in the O range of 30-100% of load2The content is 2-6%, the range is narrower, and O is measured at present2The accuracy of (A) is only 0.1%, which causes large measurement error and unobvious change, therefore, O is adopted2The content is used as the adjustment and control variable of the air quantity of the boiler, and the technical difficulty exists.
However, the CO concentration is an important index for judging the combustion condition of the pulverized coal boiler, the reaction is sensitive, and when the oxygen content of the boiler changes slightly, the CO content can change rapidly, so that the CO concentration can be used as a main index for monitoring the combustion efficiency of the boiler and judging the boiler efficiency.
Especially, after the transformation with ultralow emission, a plurality of pulverized coal boilers are transformed by low-nitrogen combustion, and pulverized coal is generally in an anoxic state when being combusted in a hearth, so that NO can be inhibitedxGeneration of NO therebyxEffective control and standard emission. CO and NOxThere is a negative correlation between NO andxat lower, CO is generally higher; in order to ensure the economical efficiency and environmental protection of the boiler in the combustion process, it is necessary to monitor CO.
The generation of CO is closely related to the air distribution, coal powder system and combustion mode of the boiler, and the CO is unevenly distributed in the tail flue of the boiler and is also O2In contrast, CO changes faster and there is a large difference in distribution across the cross section. Currently, for detecting smoke constituents at the tail of a boiler, such as O2、NOx、SO2And the average value in the section can not be accurately measured under more working conditions by adopting a single-point measurement mode, so that the method is very unfavorable for the fine adjustment and operation of the boiler. At present, attention is not paid to CO monitoring, even a monitoring measuring point is installed, the CO monitoring measuring point is often integrated into a CEMS system, the method belongs to the category of single-point measurement, and the representativeness of the average value of CO on the whole section is poor. In many power plants, a CO measuring point is arranged at a desulfurization outlet, and due to reasons such as flue gas flowing, the hysteresis is large, the combustion condition in a boiler cannot be accurately reflected in real time, and the control and adjustment are not facilitated.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a measurement system of control boiler afterbody flue total cross-section CO concentration to solve the problem that provides among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a measurement system of full cross-section CO concentration of control boiler afterbody flue, sweeps the control unit, sample pipe-line system, sweeps pipe-line system, flue gas composition analysis unit and compressed air blowback unit including the sample, wherein:
the sampling pipeline system comprises a plurality of independent sampling main pipes and a smoke sampling main pipe, wherein a plurality of sampling holes are formed in one ends of the independent sampling main pipes, and the other ends of the independent sampling main pipes are converged and then connected with the smoke sampling main pipes; an independent sampling main pipe shut-off valve is arranged outside the full section of the independent sampling main pipe extending out of the flue; the sampling of the branch flue gas is realized by switching off the valve of the independent sampling main pipe.
The blowing pipeline system comprises a plurality of independent sampling blowing main pipes and a compressed air blowing main pipe, the independent sampling blowing main pipes correspond to the independent sampling main pipes one by one, one end of each independent sampling blowing main pipe is connected with the corresponding independent sampling main pipe, and the other end of each independent sampling blowing main pipe is connected with the corresponding compressed air blowing main pipe after confluence; the independent sampling and purging main pipe is connected with the connecting end of the independent sampling and purging main pipe and is positioned between the independent sampling main pipe shut-off valve and the full section of the flue, and the independent sampling and purging main pipe is provided with the independent sampling main pipe purging shut-off valve; the independent sampling main pipe blowing and closing valve is arranged, so that the blowing and the compressed air are put into or cut off. In addition, the independent sampling purging main pipes are equal in number to the independent sampling main pipes, each independent sampling main pipe is provided with an independent compressed air purging pipeline, and purging or sampling of the independent sampling main pipes is achieved through the independent sampling main pipe purging on-off valve.
The compressed air blowing main pipe is connected with the sampling blowing control unit through a compressed air back blowing unit; the sampling and purging control unit can switch and control the independent sampling main pipe shut-off valve and the independent sampling main pipe purging shut-off valve, and periodic sampling analysis and purging blocking prevention are achieved. The sampling and blowing control unit sends instructions to the smoke component analysis unit and the compressed air back blowing unit, the smoke component analysis unit feeds back smoke component analysis results and the state of the independent sampling main pipe shut-off valve to the sampling and blowing control unit, and the compressed air back blowing unit feeds back the state of the independent sampling main pipe shut-off valve to the sampling and blowing control unit.
Further scheme, equidistant arrangement between a plurality of independent sample female pipes, the thief hole on the independent sample female pipe is evenly arranged.
The measuring method for monitoring the CO concentration of the whole section of the tail flue of the boiler based on the measuring system comprises the following steps:
(1) partitioning the whole cross section of the tail flue of the boiler to form M x N measuring grids, measuring the CO concentration distribution on the whole cross section of the flue, and when the relative standard deviation of the CO concentration distribution in the horizontal direction on the whole cross section of the flue is smaller than the relative standard deviation of the CO concentration distribution in the vertical direction, arranging the independent sampling main pipes in the horizontal direction; when the relative standard deviation of the CO concentration distribution in the vertical direction on the whole section of the flue is smaller than the relative standard deviation of the CO concentration distribution in the horizontal direction, the independent sampling main pipes are arranged in the vertical direction, and the sampling holes are placed in the measurement grid area; wherein M, N are each greater than 1;
(2) when the independent sampling main pipes are vertically arranged, the number of the independent sampling main pipes is M; when the independent sampling main pipes are horizontally arranged, the number of the independent sampling main pipes is N; sequentially numbered as I, II, III … … M-2/N-2, M-1/N-1 and M/N;
(3) opening an independent sampling main pipe shutoff valve on the first independent sampling main pipe, and simultaneously closing an independent sampling main pipe purging shutoff valve on the first independent sampling main pipe to indicate that the flue gas of the branch is in the sampling measurement process; in the sampling measurement process, the independent sampling main pipe shutoff valve and the independent sampling main pipe purging shutoff valve on each independent sampling main pipe cannot act simultaneously, namely the two valves cannot be opened or closed simultaneously; closing an independent sampling main pipe shutoff valve on the 2-M/N independent sampling main pipe, and simultaneously opening an independent sampling main pipe purging shutoff valve on the 2-M/N independent sampling main pipe to indicate that the branches are in a purging state, so as to prevent a sampling hole without sampling measurement from being blocked;
(4) after the first independent sampling main pipe finishes sampling, closing an independent sampling main pipe shutoff valve on the first independent sampling main pipe, and simultaneously opening an independent sampling main pipe purging shutoff valve on the first independent sampling main pipe; then opening an independent sampling main pipe shutoff valve on a second independent sampling main pipe, and repeating the operation in the step (3) until the M/N independent sampling main pipe finishes sampling; the CO concentration value measured by the independent sampling main pipe after sampling enters a self-holding stage, and the CO concentration value of the independent sampling main pipe area is not updated until the next sampling period comes and a new CO concentration is detected;
(5) the sampling time of each independent sampling main pipe is (t)0+ t) s, wherein t0The time of the sampling smoke flowing from the tail end to the smoke component analysis unit in the longest sampling pipeline is s; t is effective sampling time which can be adjusted in the sampling and measuring process and is controlled by a sampling and purging control unit, and the numerical value of the time is mainly determined by factors such as boiler load, combustion coal quality, measured tail flue full-section CO concentration distribution and the like; through the steps, the CO concentration measurement on the whole flue section can be realized, and when the sampling main pipe is vertically arranged, the CO concentration measurement passes through M (t)0+ t) s time, a complete detection cycle can be completed; when the sampling main pipe is horizontally arranged, N x (t) is passed0And + t) s time, a complete detection period can be completed.
In a further scheme, the areas of the measurement grids in the step (1) are equal, and the sampling holes are arranged in the centers of the areas of the measurement grids no matter the whole section of the flue is rectangular or circular.
Further, when the CO concentration distribution on the whole section of the flue is measured in the step (1), at least three different boiler load points are measured, such as 100%, 75% and 50%.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model divides the whole cross section of the boiler tail flue to form a plurality of measuring grids, and the CO concentration on the whole cross section of the flue can be detected by arranging a measuring sampling hole on each measuring grid; the utility model realizes the detection processes of measurement alternation, purging and the like in each independent sampling main pipe through the switching of the independent sampling main pipe shutoff valve and the independent sampling main pipe purging shutoff valve, has reasonable arrangement structure and saves the system investment cost; and through the control unit, the sampling time, the purging time and the holding time of each independent sampling main pipe are alternated, so that the comprehensive detection of the CO concentration on the section of the whole flue is realized, and the comprehensive monitoring of the combustion working condition in the hearth is facilitated.
(2) The utility model discloses according to the CO concentration distribution characteristic of measuring the cross-section, turn into the one-dimensional measurement with two-dimensional plane multiple spot measurement, the simplified system arranges.
(3) The utility model discloses can realize the CO concentration measurement of boiler afterbody flue full cross-section, reduce measuring instrument's configuration.
Drawings
FIG. 1 is a schematic diagram of the sampling of the whole cross section of the flue with the independent sampling main pipe vertically arranged;
FIG. 2 is a schematic diagram of the sampling of the whole cross section of the flue with the independent sampling main pipe horizontally arranged;
FIG. 3 is a schematic structural view of a system for measuring the total cross-section CO concentration of a flue according to the present invention;
in the figure: 1-full section of flue, 2-measuring grid, 3-independent sampling main pipe, 4-sampling hole, 5-width direction of boiler, 6-depth direction or height direction of boiler, 7-first independent sampling main pipe shutoff valve, 8-second independent sampling main pipe shutoff valve, 9-third independent sampling main pipe shutoff valve, 10-M-2 independent sampling main pipe shutoff valve, 11-M-1 independent sampling main pipe shutoff valve, 12-M independent sampling main pipe shutoff valve, 13-first independent sampling main pipe purging shutoff valve, 14-second independent sampling main pipe purging shutoff valve, 15-third independent sampling main pipe purging shutoff valve, 16-M-2 independent sampling main pipe purging shutoff valve, 17-M-1 independent sampling main pipe purging shutoff valve, The method comprises the following steps of 18-Mth independent sampling main pipe blowing and shutting valve, 19-smoke sampling main pipe, 20-compressed air blowing main pipe, 21-smoke component analysis unit, 22-compressed air back blowing unit, 23-sampling blowing control unit and 24-independent sampling blowing main pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 3, a measurement system for monitoring the total cross-section CO concentration of a boiler tail flue includes a sampling and purging control unit 23, a sampling pipeline system, a purging pipeline system, a flue gas component analysis unit 21, and a compressed air blowback unit 22, wherein:
the sampling pipeline system comprises a plurality of independent sampling main pipes 3 and a smoke sampling main pipe 19, wherein a plurality of sampling holes 4 are formed in one ends of the independent sampling main pipes 3, and the other ends of the independent sampling main pipes 3 are converged and then connected with the smoke sampling main pipe 19; an independent sampling main pipe shut-off valve (7-12) is arranged on the independent sampling main pipe 3 extending out of the whole section 1 of the flue; the sampling of the branch flue gas is realized by switching off the valve of the independent sampling main pipe. The plurality of independent sampling main pipes are arranged at equal intervals, and the sampling holes in the independent sampling main pipes are uniformly arranged.
The blowing pipeline system comprises a plurality of independent sampling blowing main pipes 24 and a compressed air blowing main pipe 20, the independent sampling blowing main pipes correspond to the independent sampling main pipes one by one, one end of each independent sampling blowing main pipe is connected with the independent sampling main pipe, and the other end of each independent sampling blowing main pipe is connected with the compressed air blowing main pipe 20 after confluence; the connecting end of the independent sampling and purging main pipe and the independent sampling main pipe is positioned between the independent sampling main pipe shut-off valve and the full section 1 of the flue, and the independent sampling and purging main pipe is provided with an independent sampling main pipe purging shut-off valve (13-18); the independent sampling main pipe blowing and closing valve is arranged, so that the blowing and the compressed air are put into or cut off. In addition, the independent sampling purging main pipes are equal in number to the independent sampling main pipes, each independent sampling main pipe is provided with an independent compressed air purging pipeline, and purging or sampling of the independent sampling main pipes is achieved through the independent sampling main pipe purging on-off valve.
The flue gas sampling main pipe 19 is connected with a sampling and purging control unit 23 through a flue gas component analysis unit 21, and the compressed air purging main pipe 20 is connected with the sampling and purging control unit 23 through a compressed air back flushing unit 22; the sampling and purging control unit 23 can switch and control the independent sampling main pipe shutoff valves (7-12) and the independent sampling main pipe purging shutoff valves (13-18), so that periodic sampling analysis and purging anti-blocking are realized. In the measuring process, the sampling and purging control unit 23 sends out instructions to the flue gas component analysis unit 21 and the compressed air back-blowing unit 22, the flue gas component analysis unit 21 feeds back the flue gas component analysis result and the independent sampling main pipe shut-off valve state to the sampling and purging control unit 23, and the compressed air back-blowing unit 22 feeds back the independent sampling main pipe shut-off valve state to the sampling and purging control unit.
A measuring method for monitoring the concentration of CO in the whole section of a tail flue of a boiler comprises the following steps:
(1) the method comprises the following steps of (1) partitioning the whole cross section of a boiler tail flue to form M x N measuring grids 2, wherein the areas of the measuring grids 2 are equal, no matter the whole cross section 1 of the flue is rectangular or circular, the CO concentration distribution on the whole cross section 1 of the flue is measured, and when the relative standard deviation of the CO concentration distribution in the horizontal direction on the whole cross section 1 of the flue is smaller than the relative standard deviation of the CO concentration distribution in the vertical direction, independent sampling main pipes 3 are arranged in the horizontal direction, as shown in figure 2; when the relative standard deviation of the CO concentration distribution in the vertical direction on the whole cross section 1 of the flue is smaller than the relative standard deviation of the CO concentration distribution in the horizontal direction, the independent sampling main pipes 3 are arranged in the vertical direction, as shown in fig. 1, and when the CO concentration distribution on the whole cross section of the flue is measured, at least three different load points, such as 100%, 75% and 50%, are measured. Placing a sampling hole 4 in the area of the measurement grid 2, wherein the sampling hole 4 is arranged in the center of the area of the measurement grid 2; in fig. 3, M =6 and N =5 are taken as examples;
(2) in fig. 3, the independent sampling main pipes 3 are arranged in a vertical direction, and are a first independent sampling main pipe, a second independent sampling main pipe, a third independent sampling main pipe, a fourth independent sampling main pipe, a fifth independent sampling main pipe and a sixth independent sampling main pipe in sequence from left to right;
(3) opening an independent sampling main pipe shutoff valve on the first independent sampling main pipe, and simultaneously closing a first independent sampling main pipe purging shutoff valve 7 on the first independent sampling main pipe to indicate that the flue gas of the branch is in the sampling measurement process; in the sampling measurement process, the independent sampling main pipe shutoff valve and the independent sampling main pipe purging shutoff valve on each independent sampling main pipe cannot act simultaneously, namely the two valves cannot be opened or closed simultaneously; closing the independent sampling main pipe shutoff valve on the second-sixth independent sampling main pipes, and simultaneously opening the independent sampling main pipe purging shutoff valve on the second-sixth independent sampling main pipes to indicate that the branches are in a purging state, so as to prevent sampling holes which are not subjected to sampling measurement from being blocked;
(4) after the first independent sampling main pipe finishes sampling, closing an independent sampling main pipe shutoff valve 7 on the first independent sampling main pipe, and simultaneously opening an independent sampling main pipe purging shutoff valve 13 on the first independent sampling main pipe; then opening an independent sampling main pipe shut-off valve 8 on the second independent sampling main pipe, and repeating the operation in the step (3) until the sixth independent sampling main pipe finishes sampling; the CO concentration value measured by the independent sampling main pipe after sampling enters a self-holding stage, and the CO concentration value of the independent sampling main pipe area is not updated until the next sampling period comes and a new CO concentration is detected;
(5) the sampling time of each independent sampling main pipe is (t)0+ t) s, wherein t0The time of the sampling smoke flowing from the tail end to the smoke component analysis unit in the longest sampling pipeline is s; t is effective sampling time which can be adjusted in the sampling and measuring process and is controlled by a sampling and purging control unit 23, and the numerical value of the time is mainly determined by factors such as boiler load, combustion coal quality and measured tail flue full-section CO concentration distribution; through the steps, the CO concentration measurement on the whole flue section can be realized, and the CO concentration measurement passes through 6 times (t)0+ t) s time, a complete detection cycle can be completed; if the sampling mother pipe is horizontally arranged, 5 times (t) are passed0And + t) s time, a complete detection period can be completed.
For a coal-fired boiler with the grade of 600MW, when the measuring device and the method for monitoring the CO concentration of the whole section of the tail flue of the boiler are adopted, the measuring device and the method are arranged on a vertical flue of the flue between a boiler economizer and an SCR denitration device, the whole section of the flue is in the horizontal direction, the relative standard deviation of the CO concentration distribution on the section along the width direction is large, and an independent measuring main pipe is arranged along the depth direction of the boiler, namely, is vertically arranged, as shown in figure 1.
Because the economizer export divide into about two flues, arrange 8 independent sample female pipes along boiler width direction on every flue, set up 6 thief holes on every independent sample female pipe, the flue total cross-section sets up 48 and measures the net.
Each flue is provided with a set of flue gas component analysis unit, a set of compressed air back flushing unit and a set of sampling and purging control unit. The three units are connected with 8 independent sampling shut-off valves and 8 independent sampling purging shut-off valves through a sampling pipeline system and a purging pipeline system, the sampling purging control unit realizes switching control on the 16 shut-off valves through control logic, periodic sampling analysis and purging anti-blocking are realized, and therefore the purpose of measuring the CO concentration of the whole section of the tail flue of the boiler is achieved.
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.
Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (2)
1. The utility model provides a measurement system of full cross-section CO concentration of control boiler afterbody flue which characterized in that: including sample purge control unit, sample pipe-line system, purge pipe-line system, flue gas composition analysis unit and compressed air blowback unit, wherein:
the sampling pipeline system comprises a plurality of independent sampling main pipes and a smoke sampling main pipe, wherein a plurality of sampling holes are formed in one ends of the independent sampling main pipes, and the other ends of the independent sampling main pipes are converged and then connected with the smoke sampling main pipes; an independent sampling main pipe shut-off valve is arranged outside the full section of the independent sampling main pipe extending out of the flue;
the blowing pipeline system comprises a plurality of independent sampling blowing main pipes and a compressed air blowing main pipe, the independent sampling blowing main pipes correspond to the independent sampling main pipes one by one, one end of each independent sampling blowing main pipe is connected with the corresponding independent sampling main pipe, and the other end of each independent sampling blowing main pipe is connected with the corresponding compressed air blowing main pipe after confluence; the independent sampling and purging main pipe is connected with the connecting end of the independent sampling and purging main pipe and is positioned between the independent sampling main pipe shut-off valve and the full section of the flue, and the independent sampling and purging main pipe is provided with the independent sampling main pipe purging shut-off valve;
the compressed air blowing main pipe is connected with the sampling blowing control unit through a compressed air back blowing unit; the sampling and purging control unit can switch and control the independent sampling main pipe shut-off valve and the independent sampling main pipe purging shut-off valve, and periodic sampling analysis and purging blocking prevention are achieved.
2. The measurement system of claim 1, wherein: the plurality of independent sampling main pipes are arranged at equal intervals, and the sampling holes in the independent sampling main pipes are uniformly arranged.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110044661A (en) * | 2019-05-13 | 2019-07-23 | 国家电投集团电站运营技术（北京）有限公司 | A kind of measuring system and method monitoring boiler back end ductwork total cross-section CO concentration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110044661A (en) * | 2019-05-13 | 2019-07-23 | 国家电投集团电站运营技术（北京）有限公司 | A kind of measuring system and method monitoring boiler back end ductwork total cross-section CO concentration |
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