CN212748859U - Multipoint self-drainage smoke detection system - Google Patents
Multipoint self-drainage smoke detection system Download PDFInfo
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- CN212748859U CN212748859U CN202021573086.4U CN202021573086U CN212748859U CN 212748859 U CN212748859 U CN 212748859U CN 202021573086 U CN202021573086 U CN 202021573086U CN 212748859 U CN212748859 U CN 212748859U
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Abstract
The utility model relates to a multiple spot is from drainage flue gas detection system, female pipe in sample and a plurality of sample branch pipe including interconnect, sample branch pipe evenly distributed is in the upper reaches flue, female union coupling low reaches flue and compressed air device of sample, the female pipe in CEMS sampling probe connection sample, the upper reaches flue is denitrification facility entry flue or denitrification facility export flue, the low reaches flue is air preheater export flue or dust remover entry flue. Compared with the prior art, the flue gas self-drainage can be realized, and the hysteresis quality is reduced; purging of the sampling main pipe and the sampling branch pipe is realized, and blockage of the sampling main pipe and the sampling branch pipe is avoided; the detection values are comprehensive and representative.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection equipment and specifically relates to a multiple spot is from drainage flue gas detecting system is related to.
Background
In order to master the operation state of the denitration device of the coal-fired unit at any time, the denitration device is adjusted according to the change of the operation condition, and NO is guaranteedxThe standard emission is reached, the denitration devices of the coal-fired power plant are all provided with a continuous flue gas emission monitoring system (CEMS), and NO in inlet and outlet flue gas of the denitration devices is monitored in real timex、NH3、O2And the like. Generally, a single-point sampling detection mode is mostly adopted for inlet and outlet CEMS instruments of a denitration device of a coal-fired power plant, and because the section of a denitration inlet flue and the section of a denitration outlet flue are both large and NO is generatedxThe concentration distribution is not uniform, and the CEMS detection value is not representative. Further, denitration inlet and outlet NOxThe concentration detection adopts a longer flue gas sampling conduit, and the flow rate is strictly limited to prevent blockage, so that NO is enabledxThe detection hysteresis is extremely large. Many power plant denitration export NOxLong-term deviation of meter reading from total discharge NOxThe meter is used, the operator can not input the denitration automatic control and only can refer to the total discharge NOxThe meter counts the ammonia spraying amount by hand, and brings great inconvenience to the operation control because the lag time is long. To ensure NOxCan reach the standard emission concentration, the operating personnel can always continuously increase the ammonia spraying amount of the denitration inlet, so that NO is sprayedxThe emission concentration is too low, so that the consumption of the reducing agent is increased, the ammonia escape amount is also increased rapidly, and the safe and stable operation of the generator set is influenced. Meanwhile, the smoke and dust content of the denitration inlet and outlet flue gas of part of power plant generator sets is high, so that a denitration CEMS sampling system is frequently blocked, and the operation and maintenance workload is large.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multipoint self-drainage flue gas detection system for overcoming the defects existing in the prior art.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides a multiple spot is from drainage flue gas detection system, includes female pipe of interconnect's sample and a plurality of sample branch pipe, sample branch pipe evenly distributed is in the upper reaches flue, female union coupling low reaches flue and compressed air device of sample, the female pipe of CEMS sampling probe connection sample, the upper reaches flue is denitrification facility entry flue or denitrification facility export flue, the low reaches flue is air preheater export flue or dust remover entry flue.
The sampling main pipe is connected with a compressed air device through a purge valve and a compressed air valve.
The purging valve is an electromagnetic valve and is connected with the programmable logic controller.
And a flue gas mixing tank is arranged between the downstream flue and the sampling branch pipe, and the flue gas mixing tank is connected with the CEMS sampling probe.
A stop valve is arranged between the downstream flue and the flue gas mixing tank.
And a sampling main pipe stop valve is arranged between the sampling branch pipe and the flue gas mixing tank.
The sampling main pipe stop valve is an electromagnetic valve and is connected with the programmable logic controller.
The sampling branch pipe is provided with a sampling branch valve.
The sampling branch valve is an electromagnetic valve and is connected with the programmable logic controller.
A plurality of the sampling manifolds are inserted at different depths in the upstream flue.
Compared with the prior art, the utility model has the advantages of it is following:
(1) the upstream flue is a denitration device inlet flue or a denitration device outlet flue, the downstream flue is an air preheater outlet flue or a dust remover inlet flue, and flue gas self-drainage can be realized under the action of pressure difference between the upstream flue and the downstream flue, so that the hysteresis is reduced; the sampling main pipe is connected with a compressed air device, so that the sampling main pipe and the sampling branch pipe can be swept, and the sampling main pipe and the sampling branch pipe are prevented from being blocked; the sampling branch pipes are uniformly distributed in the upstream flue, and the detection value is comprehensive and representative.
(2) A flue gas mixing tank is arranged between the downstream flue and the sampling branch pipe, so that flue gas can be mixed more uniformly, and the detection result is more accurate.
(3) Be equipped with the stop valve between low reaches flue and the flue gas blending tank, the female pipe of sample passes through compressed air valve and connects the compressed air device, when needs overhaul the female pipe of sample and sample branch pipe and maintain, only needs stop valve and compressed air valve just can realize keeping apart easy operation convenience.
(4) The sampling branch pipes are inserted into different depths of the upstream flue, so that the flue gas sampling of the whole section of the flue is realized, and the subsequent detection result is more accurate and comprehensive.
(5) The sampling main pipe stop valve, the purging valve and the sampling branch valve are connected with the programmable logic controller, the purging of the sampling branch pipe and the sampling main pipe and the regular back flushing of the CEMS instrument are synchronously and automatically carried out, the blockage is avoided, the operation and maintenance workload is reduced, and the detection of denitration flue gas parameters is not influenced.
Drawings
Fig. 1 is a schematic structural view of the present invention;
reference numerals:
1 is a sampling branch pipe; 2 is a sampling branch valve; 3 is a sampling main pipe; 4 is a sampling main pipe stop valve; 5 is a flue gas mixing tank; 6 is an upstream flue; 7 is a stop valve; 8 is a downstream flue; 9 is a purge valve; 10 is a compressed air valve; reference numeral 11 denotes a CEMS sampling probe.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Examples
The embodiment provides a multipoint self-drainage smoke detection system with an automatic purging and anti-blocking function, which comprises a sampling main pipe 3 and a plurality of sampling branch pipes 1 which are connected with each other, wherein the sampling branch pipes 1 are uniformly distributed in an upstream flue 6, the sampling main pipe 3 is connected with a downstream flue 8 and a compressed air device, a CEMS sampling probe 11 is connected with the sampling main pipe 3, the upstream flue 6 is a denitration device inlet flue or a denitration device outlet flue, and the downstream flue 8 is an air preheater outlet flue or a dust remover inlet flue; under the action of the pressure difference between the upstream flue 6 and the downstream flue 8, the flue gas self-drainage can be realized, and the hysteresis quality is reduced; the sampling main pipe 3 is connected with a compressed air device, so that the sampling main pipe 3 and the sampling branch pipes 1 can be swept, and the sampling main pipe 3 and the sampling branch pipes 1 are prevented from being blocked; the sampling branch pipes 1 are uniformly distributed in the upstream flue 6, and the detection value is representative.
The female pipe 3 of sample connects the compressed air device through purge valve 9 and compressed air valve 10, be equipped with flue gas blending tank 5 between low reaches flue 8 and the sample branch pipe 1, flue gas blending tank 5 is installed in the nearer position from denitration CEMS cell, flue gas in the flue gas blending tank 5 inserts denitration CEMS flue gas analysis appearance nearby and detects, the promptness of data has been improved, CEMS sampling probe 11 is connected to flue gas blending tank 5, be equipped with stop valve 7 between low reaches flue 8 and the flue gas blending tank 5, be equipped with the female pipe stop valve 4 of sample between sample branch pipe 1 and the flue gas blending tank 5, sample branch pipe 1 is equipped with sample branch valve 2.
The compressed air valve 10 and the stop valve 7 are manual valves, the purge valve 9, the sampling main pipe stop valve 4 and the sampling branch valve 2 are electromagnetic valves, the purge valve 9, the sampling main pipe stop valve 4 and the sampling branch valve 2 are all connected with a Programmable Logic Controller (PLC), and the PLC controls the on-off state of the Programmable Logic Controller (PLC); when the sampling main pipe 3 and the sampling branch pipe 1 need to be overhauled and maintained, the isolation can be realized only by closing the compressed air valve 10 and the stop valve 7, and the operation is simple and convenient; the purging of the sampling branch pipe 1 and the sampling main pipe 3 and the regular back flushing of the CEMS instrument are synchronously and automatically carried out, the blockage is avoided, the operation and maintenance workload is reduced, and the detection of denitration flue gas parameters is not influenced.
A plurality of sampling branch pipes 1 are inserted into different depths of an upstream flue 6, so that flue gas sampling of the whole section of the flue is realized, and a subsequent detection result is more accurate and comprehensive.
The using method comprises the following steps:
the initial state of the purge valve 9 is closed, the compressed air valve 10 is opened, the initial state of the sampling branch valve 2 is opened, and the initial states of the stop valve 7 and the sampling main pipe stop valve 4 are opened; during normal sampling, flue gas in the upstream flue 6 relies on the pressure differential, loops through each sampling branch pipe 1, the female pipe 3 of sample and flue gas blending tank 5, flows into downstream flue 8 automatically, and original CEMS sampling probe 11 is installed on flue gas blending tank 5, and the flue gas after the extraction mixes detects to denitration CEMS cell flue gas analysis appearance.
The PLC loads a designed blowing program, the blowing signal is controlled by an external access signal, when the denitration CEMS instrument outputs a back blowing state, the blowing program is triggered to be synchronously started, and compressed air (about 0.7MPa) automatically accessed to a factory alternately blows the sampling branch pipes 1 and the sampling main pipe 3. When sweeping, the sampling main pipe stop valve 4 and the sampling branch valve 2 are all closed, the sweeping valve 9 is opened, and then the sampling branch valve 2 and the sampling main pipe stop valve 4 are opened in turn to sweep in sequence. And after purging is finished, returning each valve to the initial state, and performing normal sampling detection on the system. The running time of the purging program is not more than the back flushing time of the denitration CEMS instrument, and the detection of denitration flue gas parameters is not influenced.
Claims (10)
1. The utility model provides a multiple spot is from drainage flue gas detection system, its characterized in that, including interconnect's female pipe of sample (3) and a plurality of sample branch pipe (1), sample branch pipe (1) evenly distributed is in upper reaches flue (6), the female pipe of sample (3) are connected low reaches flue (8) and compressed air device, and the female pipe of sample (3) is connected in CEMS sampling probe (11), upper reaches flue (6) are denitrification facility entry flue or denitrification facility export flue, low reaches flue (8) are air preheater export flue or dust remover entry flue.
2. The multi-point self-drainage smoke detection system according to claim 1, wherein the sampling main pipe (3) is connected with a compressed air device through a purge valve (9) and a compressed air valve (10).
3. The multipoint self-drainage smoke detection system according to claim 2, wherein said purge valve (9) is an electromagnetic valve, and said purge valve (9) is connected to a programmable logic controller.
4. The multipoint self-drainage smoke detection system according to claim 1, wherein a smoke mixing tank (5) is arranged between the downstream flue (8) and the sampling branch pipe (1), and the smoke mixing tank (5) is connected with a CEMS sampling probe (11).
5. The multipoint self-drainage smoke detection system according to claim 4, wherein a stop valve (7) is arranged between the downstream flue (8) and the smoke mixing tank (5).
6. The multipoint self-drainage smoke detection system according to claim 4, wherein a sampling main pipe stop valve (4) is arranged between the sampling branch pipe (1) and the smoke mixing tank (5).
7. The multipoint self-drainage smoke detection system according to claim 6, wherein the sampling main pipe stop valve (4) is an electromagnetic valve, and the sampling main pipe stop valve (4) is connected with a programmable logic controller.
8. The multipoint self-drainage smoke detection system according to claim 1, wherein said sampling branch pipe (1) is provided with a sampling branch valve (2).
9. The multipoint self-drainage smoke detection system according to claim 8, wherein said branch sampling valve (2) is an electromagnetic valve, and said branch sampling valve (2) is connected to a programmable logic controller.
10. A multipoint self-tapping flue gas detection system according to claim 1, wherein a plurality of said sampling branch pipes (1) are inserted into different depths of the upstream flue (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021573086.4U CN212748859U (en) | 2020-07-31 | 2020-07-31 | Multipoint self-drainage smoke detection system |
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| CN202021573086.4U CN212748859U (en) | 2020-07-31 | 2020-07-31 | Multipoint self-drainage smoke detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113433272A (en) * | 2021-08-05 | 2021-09-24 | 西安热工研究院有限公司 | Boiler flue gas multi-point drainage mixing detection device |
| CN113465996A (en) * | 2021-06-29 | 2021-10-01 | 华能国际电力股份有限公司上安电厂 | Automatic purging control system based on denitration grid sampling device |
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2020
- 2020-07-31 CN CN202021573086.4U patent/CN212748859U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113465996A (en) * | 2021-06-29 | 2021-10-01 | 华能国际电力股份有限公司上安电厂 | Automatic purging control system based on denitration grid sampling device |
| CN113433272A (en) * | 2021-08-05 | 2021-09-24 | 西安热工研究院有限公司 | Boiler flue gas multi-point drainage mixing detection device |
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