CN216144572U - Flue gas collecting device for SCR concentration field measurement - Google Patents
Flue gas collecting device for SCR concentration field measurement Download PDFInfo
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- CN216144572U CN216144572U CN202121625347.7U CN202121625347U CN216144572U CN 216144572 U CN216144572 U CN 216144572U CN 202121625347 U CN202121625347 U CN 202121625347U CN 216144572 U CN216144572 U CN 216144572U
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Abstract
The utility model relates to the technical field of flue gas detection of denitration reactors, in particular to a flue gas collecting device for measuring an SCR concentration field, which comprises: the multipoint sampling gun is placed in the SCR reactor and is used for collecting the flue gas in the SCR reactor; the first end of the induced draft system is connected to the tail end of the multipoint sampling gun, and the second end of the induced draft system is connected to the input end of the dust remover and used for generating negative pressure at the multipoint sampling gun; a measuring system connected in the induced draft system for online measurement of the multi-point sampling gunNO in collected flue gasXAnd (4) concentration. NO (nitric oxide) at each position can be detected by using branch pipes opened by a multi-point flue gas sampling gun in a circulating mannerXThe concentration is fed back in real time and is regulated by an ammonia injection grid to reduce NOXDischarging, reversely purging the multi-point sampling gun in a certain period, cleaning the multi-point sampling gun and collecting dust inside a pipeline, keeping the internal channel of the multi-point sampling gun smooth, and accurately feeding back NO in the flue gasXAnd laying a foundation for concentration.
Description
Technical Field
The utility model relates to the technical field of flue gas detection of denitration reactors, in particular to a flue gas collecting device for SCR concentration field measurement.
Background
The SCR technology is the mainstream flue gas denitration technology at present, and the concentration fields of reducing agents, NOx and other components in the reactor have great influence on the denitration efficiency. At present, the scheme of measuring and adjusting the concentration field of the components in the reactor in real time has achieved good results in practice.
However, how to accurately measure the distribution and concentration of the flue gas in the reactor is crucial to feedback regulation, and patent document 1 proposes a distributed inspection system for NOx concentration at the outlet of the SCR, which collects the gas at different points in the flue at the outlet of the SCR by using uniformly distributed multi-point sampling guns and feeds the gas back to NOXIn-line analysis system and use of ammonia injection grid for targeted reduction of NOXConcentration, but the long-time back that uses of multiple spot sampling rifle can be blockked up by the flue gas, influences the detection effect to disturb the ammonia injection accuracy.
Prior art documents:
patent document 1: CN205861653U SCR outlet NOx concentration distributed patrol measuring system
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a flue gas collecting device for measuring an SCR concentration field, which is provided with a back-blowing system, can perform back-blowing on a multi-point sampling gun in a certain period, clear accumulated dust in the multi-point sampling gun, keep the internal channel of the multi-point sampling gun smooth and accurately feed back NO in flue gasXAnd laying a foundation for concentration.
In order to achieve the above object, the present invention provides a flue gas collection device for SCR concentration field measurement, comprising:
the multipoint sampling gun is placed in the SCR reactor and is used for collecting the flue gas in the SCR reactor;
the first end of the induced draft system is connected to the tail end of the multipoint sampling gun, and the second end of the induced draft system is connected to the input end of the dust remover and used for generating negative pressure at the multipoint sampling gun;
the measuring system is connected in the induced draft system and is used for measuring NO in the smoke collected by the multi-point sampling gun on lineXConcentration;
the purging system is connected to the tail end of the multipoint sampling gun and used for discontinuously performing back purging on the multipoint sampling gun.
Preferably, the induced air system includes inlet line, gas pitcher, exhaust duct and the draught fan that arranges in proper order along the induced air direction, inlet line sets up the end at the multiple spot sampling rifle, the input at the dust remover is connected to the end of airing exhaust of draught fan.
Preferably, a first valve is arranged on the exhaust pipeline.
Preferably, the purging system comprises a purging fan and a purging pipeline, and the purging fan is connected to the tail end of the multipoint sampling gun through the purging pipeline.
Preferably, the purging system comprises a purging fan and a purging pipeline, and the purging fan is connected to the tail end of the smoke tank through the purging pipeline.
Preferably, a second valve is arranged on the purging pipeline.
Preferably, the multipoint sampling gun comprises a main pipe and a plurality of branch pipes vertically connected to the main pipe, and each branch pipe is provided with an electric control valve.
Preferably, the branch pipe is provided with an air inlet parallel to the flow direction of flue gas in the SCR reactor.
Preferably, the measuring system comprises an online smoke monitoring system, and the detection end of the online smoke monitoring system is connected to the smoke tank.
Preferably, the input end of the flue gas tank is provided with a mixer.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of the present disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the inventive subject matter of this disclosure.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a flue gas collection device for SCR concentration field measurement arranged in an SCR reactor;
FIG. 2 is a schematic structural diagram of a flue gas collection device for SCR concentration field measurement according to the present invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the utility model. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways with any smoke collection device for SCR concentration field measurements, as the disclosed concepts and embodiments are not limited to any implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
Because the smoke contains more particle sediments, the multi-point sampling gun is used for a long timeThe utility model aims to realize that a multi-point sampling gun can be reversely swept in a certain period, accumulated dust in the multi-point sampling gun and a collection pipeline is cleaned, a smooth internal channel of the multi-point sampling gun is kept, and NO in smoke can be accurately fed backXAnd laying a foundation for concentration.
Referring to FIG. 1, an ammonia injection grid is provided in the SCR reactor 13 according to the NO in the SCR reactor 13XSpraying ammonia with proper concentration to reduce NOXFor concentration purposes, the flue gas discharged from the SCR reactor 13 passes through the heat exchanger 14 and enters the dust remover 15 for dust removal, wherein the collection end of the flue gas collection device 16 is arranged at the SCR reactor 13, and the output end of the flue gas collection device 16 is connected in front of the dust remover 15, so that the output exhaust gas is subjected to dust removal treatment.
Referring to fig. 2, the embodiment provides a flue gas collection device for SCR concentration field measurement, which mainly includes a multipoint sampling gun 1, an induced draft system, a measurement system, and a purging system. The multipoint sampling gun 1 is arranged below a catalyst in the SCR reactor, specifically, the multipoint sampling gun 1 comprises a main pipe 10 and a plurality of branch pipes 9 vertically connected to the main pipe 10, and each branch pipe 9 is provided with an electric control valve 11.
Further, the branch pipe 9 is provided with an air inlet parallel to the flow direction of the flue gas in the SCR reactor, the branch pipe 9 is a stainless steel pipe, the air inlets are distributed along the length direction of the branch pipe 9, and in order to increase the flue gas capturing capacity, in an alternative embodiment, the air inlets are formed in an oval shape or a rectangular shape.
In the preferred embodiment, the inlet openings are circular and staggered along the central axis of the manifold 9 to increase the contact area of the inlet openings with the flue gas in the SCR reactor.
Further, the branch pipes 9 are arranged in an independent air inlet mode, namely, the electric control valve 11 on each branch pipe 9 is opened in sequence, so that the smoke at a certain sampling position is measured by the measuring system, namely, NO at the position is obtainedXAnd (4) concentration.
Thus, a plurality of branch pipes can be arranged9 obtaining NO in the entire SCR reactorXConcentration field, ammonia spraying grid is reused for pertinently spraying ammonia to each part of SCR reactor to remove NOXReduction of NOXThe emission concentration of (c).
Wherein, the electric control valve 11 adopts an electric eccentric half ball valve, controls the opening and closing of the electric control valve 11, controls the working state of each branch pipe 9, opens each branch pipe 9 for a preset time, and measures the NO of the position of the branch pipe 9XConcentration, and then another branch pipe 9 is replaced to be in a working state, and different branch pipes 9 can be marked by using an electric control valve 11 of each branch pipe 9.
Further, a first end of the induced draft system is connected to the tail end of the multipoint sampling gun 1, and a second end of the induced draft system is connected to the input end of the dust remover 15 and used for generating negative pressure at the multipoint sampling gun 1; the induced air system provides negative pressure, so that the flue gas enters from the multipoint sampling gun 1 and can be discharged into the dust remover 15 for dust removal.
Referring to fig. 2, specifically, the induced draft system includes an air inlet pipe 2, a flue gas tank 3, an exhaust pipe 4 and an induced draft fan 5 which are sequentially arranged along the induced draft direction, the air inlet pipe 2 is arranged at the end of the multipoint sampling gun 1, and the exhaust end of the induced draft fan 5 is connected to the input end of the dust remover 15.
So, when draught fan 5 produced the negative pressure, the input of multipoint sampling rifle 1 produced the negative pressure, and the flue gas enters into branch pipe 9 along the air inlet of branch pipe 9, then reentrant house steward 10, later enters into in the flue gas jar 3 along admission line 2, is attracted to exhaust duct 4 by draught fan 5 again.
Further, the measuring system is connected in the induced draft system and is used for measuring NO in the smoke collected by the multipoint sampling gun 1 on lineXConcentration; in an alternative embodiment, the measurement system comprises an online smoke monitoring system 12, and the detection end of the online smoke monitoring system 12 is connected to the smoke tank 3.
Wherein, be equipped with blender 8 at the input of flue gas jar 13, blender 8 is static mixer, makes to reach the purpose of good dispersion and intensive mixing between the fluid that gets into flue gas jar 13. Therefore, the flue gas on-line monitoring system 12 can detect the flue gas in the flue gas tank 13 to obtain NO in the flue gasXConcentration data.
Referring to fig. 2, the exhaust pipe 4 is provided with a first valve for intermittently back-purging the multi-point sampling gun 1. The purging system comprises a purging fan 7 and a purging pipeline 6, wherein the purging fan 7 is connected to the tail end of the multipoint sampling gun 1 through the purging pipeline 6. And a second valve is arranged on the purging pipeline 6.
In an operation period, valves on the air inlet pipeline 2 and the flue gas tank 3 are opened, and the draught fan 5 is opened; the electric control valve 11 on the branch pipe 9 is opened and closed in turn, so that the smoke in the smoke tank 3 at a certain sampling position is collected by adopting a measuring point of a smoke on-line monitoring system 12 to collect NO in the smoke tank 3XConcentration to give total NOXA concentration field. Then the real-time concentration field is sent to a control system of a power plant, and an ammonia spraying valve on an ammonia spraying grid is automatically controlled according to the real-time concentration field, so that NO in the SCR reactor can be treatedXAnd (4) real-time control of the concentration field.
After one operation period is finished, the first valve on the exhaust pipeline 4 is closed, the second valve on the purging pipeline 6 is opened, air is pumped into the multipoint sampling gun 1 to perform reverse purging, accumulated dust in the branch pipe 9, the header pipe 10 and the air inlet is cleaned, the smooth internal channel of the multipoint sampling gun 1 is kept, and the NO is fed back accuratelyXAnd laying a foundation for concentration.
In an alternative embodiment, the purge system comprises a purge fan and a purge conduit, the purge fan being connected to the end of the flue gas tank by the purge conduit. Therefore, the gas can be pumped into the flue gas tank 3, the gas inlet pipeline 2 and the multipoint sampling gun 1, and the cleanliness of the sampling channel is improved.
Further, the multipoint flue gas sampling gun 1, the gas inlet pipeline 2, the flue gas tank 3, the exhaust pipeline 4, the purging pipeline 6 and the mixer 8 are all made of stainless steel. The part exposed in the environment in the device is wrapped by the heat-preservation rock wool and is provided with the electric tracing device.
In combination with the above embodiments, the NO at each position can be detected by using the branch pipe 9 which is circularly opened by the multipoint flue gas sampling gun 1XThe concentration is fed back in real time and is regulated by an ammonia injection grid to reduce NOXDischarging, reversely purging the multi-point sampling gun 1 in a certain period, and cleaning the multi-point sampling gun1 and collecting dust in the pipeline, keeping the internal channel of the multipoint sampling gun 1 smooth and accurately feeding back NO in the flue gasXAnd laying a foundation for concentration.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (10)
1. A flue gas collection system for SCR concentration field measurement, its characterized in that includes:
the multipoint sampling gun is placed in the SCR reactor and is used for collecting the flue gas in the SCR reactor;
the first end of the induced draft system is connected to the tail end of the multipoint sampling gun, and the second end of the induced draft system is connected to the input end of the dust remover and used for generating negative pressure at the multipoint sampling gun;
the measuring system is connected in the induced draft system and is used for measuring NO in the smoke collected by the multi-point sampling gun on lineXConcentration;
the purging system is connected to the tail end of the multipoint sampling gun and used for discontinuously performing back purging on the multipoint sampling gun.
2. The smoke collection device for SCR concentration field measurement of claim 1, wherein the induced draft system comprises an air inlet pipeline, a smoke tank, an exhaust pipeline and an induced draft fan which are sequentially arranged along the induced draft direction, the air inlet pipeline is arranged at the tail end of the multipoint sampling gun, and the exhaust end of the induced draft fan is connected with the input end of the dust remover.
3. The flue gas collection device for SCR concentration field measurement of claim 2, wherein the exhaust duct is provided with a first valve.
4. The flue gas collection device for SCR concentration field measurement of any one of claims 1-3, wherein the purge system comprises a purge fan and a purge pipeline, and the purge fan is connected to the tail end of the multipoint sampling gun through the purge pipeline.
5. The flue gas collection device for SCR concentration field measurement of claim 2 or 3, wherein the purge system comprises a purge fan and a purge pipeline, and the purge fan is connected to the tail end of the flue gas tank through the purge pipeline.
6. The flue gas collection device for SCR concentration field measurement of claim 5, wherein the purge line is provided with a second valve.
7. The flue gas collecting device for SCR concentration field measurement as defined in claim 6, wherein the multi-point sampling gun comprises a main pipe and a plurality of branch pipes vertically connected to the main pipe, and each branch pipe is provided with an electrically controlled valve.
8. The flue gas collecting device for SCR concentration field measurement of claim 7, wherein the branch pipe is provided with an air inlet parallel to the flow direction of flue gas in the SCR reactor.
9. The flue gas collection device for SCR concentration field measurement of claim 6, wherein the measurement system comprises an on-line flue gas monitoring system, and the detection end of the on-line flue gas monitoring system is connected in a flue gas tank.
10. The flue gas collection device for SCR concentration field measurement of claim 6, wherein the input end of the flue gas tank is provided with a mixer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121625347.7U CN216144572U (en) | 2021-07-16 | 2021-07-16 | Flue gas collecting device for SCR concentration field measurement |
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| CN202121625347.7U CN216144572U (en) | 2021-07-16 | 2021-07-16 | Flue gas collecting device for SCR concentration field measurement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113484103A (en) * | 2021-07-16 | 2021-10-08 | 南京龙源环保有限公司 | Flue gas collecting device for SCR concentration field measurement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113484103A (en) * | 2021-07-16 | 2021-10-08 | 南京龙源环保有限公司 | Flue gas collecting device for SCR concentration field measurement |
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