CN210923437U - Balanced type denitrated ammonia escape measuring device - Google Patents
Balanced type denitrated ammonia escape measuring device Download PDFInfo
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- CN210923437U CN210923437U CN201921837857.3U CN201921837857U CN210923437U CN 210923437 U CN210923437 U CN 210923437U CN 201921837857 U CN201921837857 U CN 201921837857U CN 210923437 U CN210923437 U CN 210923437U
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Abstract
A balanced denitrification ammonia escape measuring device comprises a sampling tube, a sampling main tube and an ammonia escape optical measuring instrument, wherein the sampling main tube is arranged outside a denitrification flue, one end of the sampling tube vertically penetrates through the side wall of the denitrification flue and extends into the denitrification flue, the other end of the sampling tube is communicated with the inside of the sampling main tube in a welding mode, the sampling tube comprises a plurality of sampling tubes, the lengths of the plurality of sampling tubes extending into the denitrification flue are different, the sampling main tube is of an L-shaped structure, one end of the sampling main tube is closed, the other end of the sampling main tube is communicated with an outlet flue of an air preheater, the vertical tail end of the L-shaped sampling main tube is provided with an opening, a mounting flange is arranged at the opening, the ammonia escape optical measuring instrument is fixedly mounted on the mounting flange, an optical measuring probe rod of the ammonia escape optical measuring instrument extends into the sampling main tube, the device collects sample gas at each position in the denitrification flue into, and then the content of the ammonia gas in the sample gas is measured by an ammonia escape optical measuring instrument, so that the measurement data of the ammonia gas in the sample gas is more accurate.
Description
Technical Field
The utility model relates to a denitration ammonia escape field, especially an equilibrium formula denitration ammonia escape measuring device.
Background
At present, a single-point infrared and ultraviolet penetration measurement method is basically adopted for ammonia escape measurement of a denitration System (SCR) of a thermal power plant to carry out online ammonia escape monitoring, and due to the fact that the cross section area of a flue is large, a flow field is unbalanced, a measurement result deviates from a true value in a partial load section, ammonia spraying adjustment quality is influenced, and NO is causedXThe emission is easy to exceed the standard, the escape amount of ammonia is difficult to control, and ammonia (NH) in the flue gas3) With SO3The ammonium salt is generated by reaction and is deposited in the catalyst with fly ash, the catalyst is passivated, the denitration efficiency is reduced, the ammonium salt is deposited on the heat exchange surface of the air preheater, the air preheater is blocked, the heat exchange efficiency is reduced, the flue resistance is increased, the dust accumulation of the positive and negative electrodes of the electric precipitation is caused to bridge and jump the electric precipitation, the pressure of the air-smoke system is difficult to control, a series of problems occur, and the machine must be stopped for treatment when the problems are serious.
The current denitration ammonia escape on-line measurement mainly adopts infrared and ultraviolet penetration measurement, one side is a measuring instrument transmitting end, the other side is a measuring instrument transmitting end receiving end, and ammonia (NH) in flue gas is measured through infrared correlation3) And (4) monitoring the content of ammonia escape. The cross section of boiler flue is too large, and ammonia (NH) is in the boiler flue3) The content is inhomogeneous, generally takes a certain corner of flue to wearing the measurement, and the trompil is gone to the subtend, and ammonia escape measuring apparatu both ends are installed in the flue one corner, compare in whole flue, and here ammonia escape volume lacks the representativeness, and the measured value is unstable and accurate inadequately. In order to improve the ammonia escape measurement accuracy, a plurality of ammonia escape analyzers with the same section are mounted at multiple points and averaged in order to improve the ammonia escape measurement accuracy of individual thermal power enterprisesThe method for measuring ammonia escape is adopted by thermal power enterprises, and a multi-probe distributed monitoring mode is adopted by the thermal power enterprises for ammonia escape measurement, so that the equipment installation cost is increased linearly, the cost is increased by multiple times, the financial burden of the enterprises is increased, and the later maintenance cost is higher.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide an equilibrium formula denitrogenation ammonia escape measuring device to solve the problem that provides in the above-mentioned technical background.
The purpose of the utility model is realized through the following technical scheme:
the utility model provides an equal formula denitrating ammonia escape measuring device, includes the female pipe of sampling, sample and ammonia escape optical measurement appearance, outside the denitration flue was located to the female pipe of sample, inside denitration flue lateral wall was passed perpendicularly and extended to the denitration flue to the one end of sampling, the other end of sampling pipe passed through the inside intercommunication of the female pipe of welded mode and sample, and the female pipe of sample is L type structure, and the one end of the female pipe of sample is sealed, and the other end and air preheater export flue intercommunication, the vertical end of the female pipe of L type sample has the trompil, trompil department is equipped with mounting flange, ammonia escape optical measurement appearance fixed mounting is in on the mounting flange, and the optical measurement probe rod of ammonia escape optical measurement appearance extends to the female intraduct of sample.
Further, the sampling tube includes many sampling tubes, and many sampling tubes extend to the inside length of denitration flue all different.
Further, the sampling tube from last to welding of equidistance down on the lateral wall of denitration flue.
Further, the extension length of the optical measurement probe in the sampling mother pipe is 500 mm.
Furthermore, sampling tube and female pipe of sample are carbon steel material.
The utility model has the advantages that: this application adopts the balanced sample measurement mode of multiple spot, according to the great characteristics of flue sectional area, sets up a female pipe of sample to communicate a plurality of sampling tubes on the female pipe of sample, inside every sampling tube extended to denitration flue, with each position appearance in the denitration flueGas is converged into the sampling main pipe, an optical measurement probe rod of the ammonia escape optical measuring instrument is deeply inserted into the sampling main pipe for measurement, the measured real-time parameters are more representative, accurate data are provided for ammonia injection adjustment, ammonia injection is realized as required, and NO is enabled to be injectedXEmission control reduces ammonia escape in reasonable scope, eliminates the air preheater that ammonium salt brought and blocks up and corrode, ensures that furnace and flue pressure are stable, improves the unit security, for traditional to wearing to measure, this application does not need both ends optics to rectify, and measuring degree of accuracy is higher, and the installation is simple, and it is convenient to maintain.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure, 1-sampling tube, 2-sampling mother tube, 3-ammonia escape optical measuring instrument, 4-denitration flue, 5-air preheater outlet flue, 6-hole, 7-mounting flange and 31-optical measuring probe rod.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic concept of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
Example (b):
a balanced denitrified ammonia escape measuring device, which comprises a sampling tube 1, a sampling mother tube 2 and an ammonia escape optical measuring instrument 3, the sampling main pipe 2 is arranged outside the denitration flue 4, one end of the sampling pipe 1 vertically penetrates through the side wall of the denitration flue 4 and extends into the denitration flue 4, the other end of the sampling pipe 1 is communicated with the inside of the sampling main pipe 2 in a welding mode, the sampling main pipe 1 is of an L-shaped structure, one end of the sampling main pipe 2 is closed, the other end of the sampling main pipe is communicated with an air preheater outlet flue 5, the vertical tail end of the L-shaped sampling main pipe 2 is provided with an opening 6, an installation flange 7 is arranged at the position of the open hole 6, the ammonia escape optical measuring instrument 3 is fixedly arranged on the installation flange 7, and inside optical measurement probe 31 of ammonia escape optical measurement appearance 3 extended to female pipe 2 of sampling, sampling tube 1 included many sampling tubes, and many sampling tubes 1 extended to denitration flue 4 inside length all different.
Preferably, the sampling tube 1 is welded on the side wall of the denitration flue 4 from top to bottom at equal intervals.
Preferably, the optical measurement probe 31 extends 500mm in the sampling main tube 2.
Preferably, the sampling tube 1 and the sampling mother tube 2 are made of carbon steel.
More specifically, when the boiler is in working combustion, the pressure difference exists between the denitration flue 4 and the outlet flue 5 of the air preheater under the action of the induced draft fan, the flue gas automatically flows into the sampling tube 1 from the denitration flue 4 under the injection action of the pressure difference, and flows into the outlet flue 5 of the air preheater after being mixed in the sampling main tube 2, in the process, the length of each sampling tube 1 is different in consideration of different wind fields in the denitration flue 4, the ammonia escape optical measurement instrument 3 sucks the mixed flue gas through the optical measurement probe rod 31 and measures the ammonia content in the flue gas, because the application fully considers that the flue gas component contents of all points on the section of the denitration flue 4 are different, the multi-point balanced extraction is adopted, the multi-point flue gas is fully mixed in the sampling main tube 2, the extension length of the optical measurement probe rod 31 is shallow, the flue gas exchange time is accelerated, para-ammonia (NH)3) The response time of concentration measurement is shortened, data display is more timely, and for the adjusting system which takes the actual outlet NOx concentration as the main adjustment and takes the load and inlet NOx concentration as the feed-forward method to automatically control the ammonia spraying amount according to the requirement, the adjusting parameter can be corrected according to the measured value of ammonia escape, even the adjusting parameter is correctedThe measured value of ammonia escape can be used as the parameter of automatic adjustment to participate in the adjustment, thereby improving the automatic reliability of ammonia injection, reducing the ammonia escape, having economic benefit and being beneficial to the safety of the unit.
In conclusion, the ammonia injection system has the advantages that the sample gas in the denitration flue 4 is collected in multiple points, ammonia in the sample gas is measured more accurately, accurate data can be provided for the ammonia injection system, the ammonia injection system can control the ammonia injection amount more accurately, ammonia injection is achieved according to needs, and NO is enabled to be injectedXEmission control is in reasonable scope, reduces ammonia escape, eliminates the air preheater that ammonium salt brought and blocks up and corrode, ensures that furnace and flue pressure are stable, improves the unit security, for traditional measurement to wearing, this application does not need both ends optics to rectify, and measuring degree of accuracy is higher, and the installation is simple, and it is convenient to maintain, all has very big positive effect to promoting thermal power factory environmental protection index and safe economic operation, is fit for using widely.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (5)
1. A balanced denitrified ammonia escape measuring device, which comprises a sampling tube (1), a sampling mother tube (2) and an ammonia escape optical measuring instrument (3), it is characterized in that the sampling main pipe (2) is arranged outside the denitration flue (4), one end of the sampling pipe (1) vertically penetrates through the side wall of the denitration flue (4) and extends to the inside of the denitration flue (4), the other end of the sampling pipe (1) is communicated with the inside of the sampling main pipe (2) in a welding mode, the sampling main pipe (2) is of an L-shaped structure, one end of the sampling main pipe (2) is sealed, the other end of the sampling main pipe is communicated with an air preheater outlet flue (5), the vertical tail end of the L-shaped sampling main pipe (2) is provided with an open hole (6), an installation flange (7) is arranged at the position of the open hole (6), the ammonia escape optical measuring instrument (3) is fixedly installed on the installation flange (7), and an optical measurement probe rod (31) of the ammonia escape optical measurement instrument (3) extends to the interior of the sampling main pipe (2).
2. The balanced denitrified ammonia escape measuring device as recited in claim 1, wherein the sampling tube (1) comprises a plurality of sampling tubes, and the lengths of the sampling tubes (1) extending to the inside of the denitration flue (4) are different.
3. The balanced type denitrified ammonia escape measuring device as recited in claim 2, wherein the plurality of sampling tubes (1) are welded on the side wall of the denitration flue (4) from top to bottom at equal intervals.
4. An equilibrium-type denitrified ammonia escape measuring device as claimed in claim 1, wherein the optical measuring probe (31) has an extension length of 500mm in the sampling mother pipe (2).
5. The balanced denitrified ammonia escape measuring device as recited in claim 1, wherein the sampling tube (1) and the sampling mother tube (2) are made of carbon steel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921837857.3U CN210923437U (en) | 2019-10-29 | 2019-10-29 | Balanced type denitrated ammonia escape measuring device |
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| CN201921837857.3U CN210923437U (en) | 2019-10-29 | 2019-10-29 | Balanced type denitrated ammonia escape measuring device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827724A (en) * | 2018-06-21 | 2018-11-16 | 华能国际电力股份有限公司 | Multipoint equivalent mixing two-stage injection rapid sampling device and method for large-section flue SCR-CEMS flue gas |
| CN111766349A (en) * | 2020-08-04 | 2020-10-13 | 浙江浙能技术研究院有限公司 | Partitioned sampling ammonia escape measurement system and method |
| CN112229953A (en) * | 2020-10-09 | 2021-01-15 | 建德南方水泥有限公司 | Denitration ammonia escape detection device |
-
2019
- 2019-10-29 CN CN201921837857.3U patent/CN210923437U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827724A (en) * | 2018-06-21 | 2018-11-16 | 华能国际电力股份有限公司 | Multipoint equivalent mixing two-stage injection rapid sampling device and method for large-section flue SCR-CEMS flue gas |
| CN108827724B (en) * | 2018-06-21 | 2024-01-26 | 华能国际电力股份有限公司 | Sampling method of flue gas multipoint equivalent mixing two-stage injection rapid sampling device |
| CN111766349A (en) * | 2020-08-04 | 2020-10-13 | 浙江浙能技术研究院有限公司 | Partitioned sampling ammonia escape measurement system and method |
| CN112229953A (en) * | 2020-10-09 | 2021-01-15 | 建德南方水泥有限公司 | Denitration ammonia escape detection device |
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