CN217466376U - Ammonia escape sampling system - Google Patents
Ammonia escape sampling system Download PDFInfo
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- CN217466376U CN217466376U CN202220102254.4U CN202220102254U CN217466376U CN 217466376 U CN217466376 U CN 217466376U CN 202220102254 U CN202220102254 U CN 202220102254U CN 217466376 U CN217466376 U CN 217466376U
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Abstract
The utility model discloses an ammonia escape sampling system, which comprises at least one group of sampling units, wherein each sampling unit comprises a sampling device (1), an absorption device (2) and a sampling device (3) which are sequentially communicated, and the sampling device (3) can suck smoke in a flue into the absorption device (2) through the sampling device (1); the sampling unit further comprises a controller (4), and after the sampling device (3) sucks for a preset time, the controller (4) can control the absorption device (2) to sample. The utility model discloses can eliminate the influence of air volume in the sample pipeline, improve ammonia escape test accuracy.
Description
Technical Field
The utility model relates to a pollutant sampling technical field, concretely relates to ammonia escape sampling system.
Background
China power plants are mainly coal-fired power plants, NOx in coal-fired flue gas is one of main sources causing air pollution, and at present, Selective Catalytic Reduction (SCR) is generally adopted for flue gas denitration in coal-fired power plants, namely NH is performed under the action of catalysts 3 Reaction with NOx to form N 2 And H 2 And O. The ammonia injection amount is small, so that the denitration efficiency is reduced; the ammonia injection amount is large, ammonia escape is easily caused, scaling and blockage of the air preheater are caused, the output of a draught fan is insufficient, the boiler is difficult to carry full load, and the safe and stable operation of a unit is seriously influenced. With the large-scale operation of SCR denitration, the ammonia escape situation is highly concerned, and how to accurately measure the ammonia escape amount and the field distribution uniformity of the escaped ammonia becomes an important problem to be considered by a person skilled in the art for realizing the accurate ammonia injection of SCR denitration.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an ammonia escape sampling system eliminates the influence of air volume in the sample pipeline, improves ammonia escape test accuracy.
In order to solve the technical problem, the utility model provides an ammonia escape sampling system, which comprises at least one group of sampling units, wherein each sampling unit comprises a sampling device, an absorption device and a sampling device which are sequentially communicated, and the sampling device can suck the flue gas in a flue into the absorption device through the sampling device;
the sampling unit further comprises a controller, and after the sampling device sucks for a preset time, the controller can control the absorption device to sample.
It can be understood that before sampling, the pipeline between the front end of the sampling device and the absorption device is filled with air, and the existence of the air volume can affect the accuracy of the ammonia escape test, therefore, the utility model discloses a controller can control the absorption device to start sampling after the sampling device sucks the preset time, the preset time is the evacuation time that the flue gas in the flue reaches the absorption device under the suction effect of the sampling device can be calculated to the controller, that is, the time that all the air between the front end of the sampling device and the absorption device is evacuated is required, thereby postponing the calculation of the sampling time after the calculated evacuation time, eliminating the influence of the air volume in the sampling pipeline, and ensuring the accuracy of the ammonia escape test result; in addition, when the number of the sampling units is multiple, the controller in each sampling unit can calculate delayed emptying time respectively and then starts to calculate the sampling time, the sampling time of each sampling unit is equal, and the effective flue gas volume collected by each sampling unit is equivalent, so that synchronous sampling is truly realized, and the field distribution uniformity of the escaped ammonia is accurately judged.
Optionally, the sampling device comprises a sampling tube and a filter hermetically connected to the front end of the sampling tube, wherein the filter is used for filtering dust in the flue gas.
Optionally, the circumferential wall of the sampling tube is provided with a mark for displaying the length from the front end of the sampling tube to the mark.
Optionally, the sampling device further comprises a heating sleeve, the heating sleeve is sleeved on the rear end of the sampling tube and used for heating the flue gas in the rear end of the sampling tube.
Optionally, the temperature of the flue gas inside the rear end of the sampling tube can be maintained at 260 ± 5 ℃.
Optionally, the heating sleeve includes a sleeve body and end walls detachably fixed to two ends of the sleeve body, two of the end walls are correspondingly provided with at least one via hole, and the sampling tube is inserted into the via hole corresponding to the two ends.
Optionally, at least in the end wall at one end, the through hole is provided with an internal thread, the sampling tube is provided with an external thread at a corresponding position, and the sampling tube is in threaded connection with the through hole;
and/or the two end walls are correspondingly provided with a plurality of through holes which are distributed annularly.
Optionally, the absorption device includes at least one absorption bottle, and a fixing base, the fixing base is provided with at least one group of fixing slots, each group of fixing slots has at least one fixing slot, and the absorption bottle is correspondingly inserted into the fixing slot.
Optionally, a one-way valve is further arranged between the absorption device and the sampling device, so that the smoke can only flow from the absorption device to the sampling device.
Optionally, the number of the sampling units is multiple, and the sampling unit further comprises a master controller, wherein the master controller is communicated with each of the controllers and is used for controlling the controllers to be turned on or turned off in a unified manner.
Optionally, the system further comprises a plurality of control switches, and the control switches are correspondingly arranged between the master controller and the controller.
Optionally, the sampling device and the absorption device are detachably communicated through a connecting pipe;
the back flushing device can be communicated with the rear end of the connecting pipe so as to clear residual smoke in the sampling device.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an ammonia slip sampling system according to the present invention;
FIG. 2 is a schematic diagram of a first end wall of the ammonia slip sampling system of FIG. 1;
FIG. 3 is a schematic diagram of a second end wall of the ammonia slip sampling system of FIG. 1;
wherein the reference numerals in fig. 1-3 are explained as follows:
1-a sampling device; 11-a sampling tube; 12-a filter; 13-heating the sleeve; 131-a sleeve body; 132-an end wall; 132 a-a via;
2-an absorption device; 21-an absorption bottle; 22-a fixed seat;
3-a sampling device;
4-a controller;
5-a one-way valve;
6-a master controller;
7-connecting pipe;
8-a back blowing device.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Herein, the flow direction of the smoke in the sampling unit is the front-back direction under the suction action of the sampling device 3.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an ammonia escape sampling system provided by the present invention.
The utility model provides an ammonia escape sampling system, which comprises at least one group of sampling units, wherein each sampling unit comprises a sampling device 1, an absorption device 2 and a sampling device 3 which are sequentially communicated, at least the front end of the sampling device 1 is placed in a flue, and the sampling device 3 can suck flue gas in the flue into the absorption device 2 through the sampling device 1;
the sampling unit further comprises a controller 4, the controller 4 being capable of controlling the absorption means 2 to start sampling after the sampling means 3 has aspirated for a predetermined time.
It can be understood that before sampling, the pipeline between the front end of the sampling device 1 and the absorption device 2 is filled with air, and the existence of air volume can affect the accuracy of the ammonia escape test, therefore, the controller 4 can control the absorption device 2 to start sampling after the sampling device 3 sucks preset time, and the preset time, namely the evacuation time required for the smoke in the flue to reach the absorption device 2 under the suction effect of the sampling device 3, namely the time required for evacuating all the air between the front end of the sampling device 1 and the absorption device 2, so as to delay the calculation of the sampling time after the calculated evacuation time, eliminate the influence of the air volume in the sampling pipeline, and ensure the accuracy of the ammonia escape test result; in addition, when the number of the sampling units is multiple, the controller 4 in each sampling unit can calculate the delayed evacuation time respectively and then starts to calculate the sampling time, so that the sampling time of each sampling unit is equal, and the effective flue gas volume collected by each sampling unit is equivalent, thereby really realizing synchronous sampling and accurately judging the field distribution uniformity of the escaped ammonia.
Specifically, the controller 4 has independent control interfaces, and the pipe diameter and the length of the pipeline between the front end of the sampling device 1 and the absorption device 2 can be input into each independent control interface, so that the emptying time can be automatically calculated under the condition that the sampling flow of the sampling device 3 is known.
Specifically, sampling device 1 includes sampling tube 11 and sealed connection in sampling tube 11 front end filter 12, and filter 12 is used for filtering the dust in the flue gas, and the flue gas in the flue can reentry sampling tube 11 inside after the filtering dust.
Wherein, the filter 12 adopts a surface filtration mode, the interior of the filter is hollow, an airflow channel is formed, the front end is sealed, the rear end is hermetically connected with the sampling tube 11, and the trapping efficiency of the filter 12 on particles with the average particle diameter of 0.3 μm and 0.6 μm is not lower than 99.5 percent and 99.9 percent.
Therefore, under the suction action of the sampling device 3, the dust in the flue gas can be filtered on the surface of the filter 12, the flue gas with the dust removed enters the sampling tube 11 and then enters the absorption device 2, and the dust adsorbed on the surface of the filter 12 is easy to desorb along with the flow of the flue gas, so that the resistance inside the sampling tube 11 is reduced; the filter 12 may be made of ceramic or other high temperature resistant material.
Wherein, the circumferential wall of the sampling tube 11 is provided with a mark for displaying the length from the front end of the sampling tube 11 to the mark, and the mark can be a scale mark or a number; by means of these marks, the depth of insertion of the sampling tube 11 into the flue can be read in real time. In addition, the sampling tube 11 can be made of stainless steel or other corrosion-resistant materials, so that corrosion in the sampling process is avoided; the inner diameter of the sampling tube 11 is 6mm, 8mm or others, and when the number of sampling units is plural, the inner diameters of the sampling tubes 11 in plural sampling units should be uniform.
Further, since only the front end of the sampling tube 11 is disposed in the flue in this embodiment, the flue gas temperature in the flue is high, the flue temperature is low, and temperature differences may occur between the front end and the rear end of the sampling tube 11, which may cause NH during sampling 3 Is lost, therefore, the present practice isWith novel sampling device 1 still including heating sleeve 13, heating sleeve 13 suit sampling tube 11's rear end for heat the inside flue gas of sampling tube 11 rear end, make the flue gas temperature in the sampling tube 11 rear end can remain invariable throughout, if can keep at 260 +/-5 ℃. Meanwhile, the outer diameter of the heating sleeve 13 is smaller than the inner diameter of the on-site sampling hole, so that the heating sleeve 13 can enter the flue through the sampling hole part to be fixed.
Specifically, the heating sleeve 13 includes a sleeve body 131, and end walls 132 detachably fixed to two ends of the sleeve body 131, the two end walls 132 are correspondingly provided with at least one through hole 132a, and the sampling tube 11 is inserted into the through holes 132 corresponding to the two ends.
It can be understood that the number of the through holes 132a should be consistent with the number of the sampling tubes 11, therefore, in this embodiment, the end wall 132 is detachably fixed to the sleeve body 131, and when the number of the sampling units, i.e. the sampling tubes 11, changes, different end walls 132 can be replaced, so as to meet the requirement of simultaneous sampling at multiple points.
Wherein, the end wall 132 at the front end is provided with external threads, the front end of the sleeve body 131 is provided with internal threads, and the end wall 132 at the front end is fixed on the sleeve body 131 through threads; the end wall 132 at the rear end is provided with internal threads, the rear end of the sleeve body 131 is provided with external threads, and the end wall 132 at the rear end is also fixed to the sleeve body 131 by threads. Of course, the end walls 132 at the two ends may be fixed to the sleeve body 131 by a screw connection, or may be fixed by a detachable fixing manner such as a snap connection, which is not limited herein.
As shown in fig. 2 and 3, when the number of the through holes 132a provided corresponding to the two end walls 132 is plural, the plural through holes 132a are distributed annularly. Of course, the distribution of the vias 132a is not limited.
Further, in this embodiment, in the end wall 132 at the rear end, the through hole 132a thereof is provided with an internal thread, the sampling tube 11 is provided with an external thread at a corresponding position, and the sampling tube 11 is in threaded connection with the through hole 132a, so as to ensure the stability of the sampling tube 11 disposed inside the heating sleeve 13.
Of course, in practice, the end wall 132 at the front end has its through hole 132a internally threaded; or both end walls 132, the through hole 132a may be internally threaded.
In addition, the rear end of the sleeve body 131 is also provided with a power interface, that is, the sleeve body 131 is electrically heated.
Referring to fig. 1, in the present embodiment, the absorption apparatus 2 includes two absorption bottles 21 and a fixing seat 22, the fixing seat 22 is provided with two fixing slots, the absorption bottles 21 are correspondingly placed in the fixing slots, the front absorption bottle 21 is connected to the sampling tube 11 through a connecting tube 7, such as a silicone tube, and the rear absorption bottle 21 is connected to the sampling apparatus 3 through the connecting tube 7, and the inner diameter of the connecting tube 7 may be phi 6mm, phi 8mm or other.
In the above description, for example, one sampling unit is taken as an example, when the number of the sampling units is plural, the fixing base 22 may be provided with a plurality of fixing grooves, each two fixing grooves are in a group, for installing two absorption bottles 21 in one sampling unit, and the inner diameter of the connecting pipe 7 used in each sampling unit should be kept uniform.
Of course, in practical applications, the number of the absorption bottles 21 provided on the same absorption device 2 is not limited, and may be at least one.
Further, the sampling device 3 can be a commonly used sampling instrument at present, the sampling instrument can set sampling flow, such as 1-5L/min, and can also measure atmospheric pressure, pressure before the flowmeter, temperature before the flowmeter, humidity, flow and the like in real time. The front end of the sampling device 3 is also provided with a one-way valve 5, so that the smoke can only flow from the absorption device 2 to the sampling device 3 and can not flow reversely.
Please continue to refer to fig. 1, in the present invention, the number of the sampling units is plural, and the sampling unit further includes a master controller 6, the master controller 6 is communicated with each controller 4, and is used for controlling the controllers 4 to open or close in a unified manner, during the sampling process, when each controller 4 receives the opening instruction of the master controller 6 at the same time, each controller 4 automatically calculates the emptying time, and delays the emptying time to start sampling; when each controller 4 receives the stop instruction of the master controller 6 at the same time, each controller 4 also controls the sampling device 3 to stop sampling according to the calculated emptying time delay, so that the sampling time of each sampling unit is ensured to be equal, and the collected effective smoke volume is ensured to be equivalent, thereby realizing synchronous sampling.
In addition, a control switch is arranged between the master controller 6 and each controller 4, and whether the controller 4 receives the start-stop instruction of the master controller 6 or not can be controlled by turning on and off the control switch.
Please continue to refer to fig. 2, further comprising a back-blowing device 8, wherein the back-blowing device 8 can output clean air outwards, the flow rate can reach 10-20L/min, when a sample is collected, the sampling device 1 and the connecting pipe 7 connected together can be connected into the back-blowing device 8, the residual flue gas in the sampling device 1, including the residual flue gas in the sampling pipe 11 and the connecting pipe 3, is removed, and meanwhile, part of dust intercepted in the filter 12 is removed, so that no residual flue gas is left in the sampling pipeline before sampling, and all the flue gas is ambient air.
The utility model discloses ammonia escape sampling system's sampling process as follows:
firstly, selecting a proper end wall 132 to be fixed on the sleeve body 131 according to the number requirement of sampling points, selecting a proper sampling tube 11 according to the sampling depth requirement, communicating the sampling tube 11 with the front end of the absorption bottle 21 through the connecting tube 7, communicating the rear end of the absorption bottle 21 with a sampler through the connecting tube 7, installing the rear end of the sampling tube 11 in the heating sleeve 13, and selecting a proper fixing seat 22 for placing the absorption bottle 21;
secondly, selecting corresponding controllers 4 and master controllers 6 according to the number of sampling points, closing a control switch between each controller 4 and the master controller 6, inputting the pipe diameters and the lengths of corresponding sampling pipes 11 and connecting pipes 7 on a control panel corresponding to each controller 4, and setting sampling flow and other related parameters in each way of sampling instrument;
then, starting a heating device of the heating sleeve 13, inserting the sampling tube 11 into the flue until the front end of the heating sleeve 13 enters the flue, waiting for several minutes, and starting the master controller 6 to control the sampling instrument to start sampling or stop sampling after the temperature in the sampling tube 11 is stable;
after the sampling is stopped, the connection between the connecting pipe 7 and the front end of the absorption bottle 21 is disconnected, the sample is cleaned, after the sample is cleaned, the connecting pipe 7 is connected into the back flushing device 8 one by one, residual smoke and dust attached to the filter 12 in the sampling device 1 are removed, and the next round of sampling is prepared.
It introduces to have gone on the detailed description above the utility model provides an ammonia escape sampling system, it is right that this paper has used specific individual example the utility model discloses a principle and embodiment have explained, and the description of above embodiment is only used for helping understanding the utility model discloses a method and core thought thereof. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (12)
1. An ammonia escape sampling system is characterized by comprising at least one group of sampling units, wherein each sampling unit comprises a sampling device (1), an absorption device (2) and a sampling device (3) which are sequentially communicated, and the sampling device (3) can suck smoke in a flue into the absorption device (2) through the sampling device (1);
the sampling unit further comprises a controller (4), and after the sampling device (3) sucks for a preset time, the controller (4) can control the absorption device (2) to sample.
2. The ammonia escape sampling system of claim 1, wherein the sampling device (1) comprises a sampling tube (11) and a filter (12) sealingly connected to the front end of the sampling tube (11), the filter (12) being adapted to filter dust from the flue gas.
3. The ammonia escape sampling system of claim 2 wherein the perimeter wall of the sampling tube (11) is provided with a marker for indicating the length of the sampling tube (11) from the forward end to the marker.
4. The ammonia escape sampling system of claim 2, wherein the sampling device (1) further comprises a heating sleeve (13), the heating sleeve (13) being sleeved on the rear end of the sampling tube (11) for heating the flue gas inside the rear end of the sampling tube (11).
5. The ammonia escape sampling system of claim 4 wherein the temperature of the flue gas inside the rear end of the sampling tube (11) can be maintained at 260 ± 5 ℃.
6. The ammonia escape sampling system of claim 4, wherein the heating sleeve (13) comprises a sleeve body (131) and end walls (132) detachably fixed at two ends of the sleeve body (131), at least one through hole (132a) is correspondingly arranged on two end walls (132), and the sampling tube (11) is arranged in the through hole (132a) correspondingly arranged at two ends.
7. The ammonia escape sampling system of claim 6, wherein at least in the end wall (132) at one end, the through hole (132a) is provided with an internal thread, the sampling tube (11) is provided with an external thread at a corresponding position, and the sampling tube (11) is in threaded connection with the through hole (132 a);
and/or the number of the through holes (132a) correspondingly arranged on the two end walls (132) is multiple, and the multiple through holes (132a) are distributed annularly.
8. An ammonia escape sampling system according to any one of claims 1 to 7, wherein the absorption device (2) comprises at least one absorption bottle (21), and a fixed seat (22), the fixed seat (22) is provided with at least one set of fixed grooves, each set of fixed grooves has at least one fixed groove, and the absorption bottle (21) is correspondingly inserted into the fixed groove.
9. An ammonia escape sampling system as claimed in any one of claims 1 to 7, wherein a one-way valve (5) is provided between the absorption device (2) and the sampling device (3) to enable flue gas to flow only from the absorption device (2) to the sampling device (3).
10. The ammonia escape sampling system according to any one of claims 1 to 7, wherein the number of the sampling units is multiple, and the sampling system further comprises a general controller (6), wherein the general controller (6) is communicated with each controller (4) and is used for uniformly controlling the on or off of each controller (4).
11. The ammonia escape sampling system of claim 10, further comprising a plurality of control switches correspondingly disposed between the general controller (6) and the controller (4).
12. The ammonia slip sampling system according to any of claims 2-7, wherein the sampling device (1) further comprises a connection tube (7) communicating the sampling tube (11) with the absorption device (2);
the device is characterized by further comprising a back blowing device (8), wherein the back blowing device (8) can be communicated with the rear end of the connecting pipe (7) to remove residual smoke of the sampling device (1) and dust attached to the surface of the filter (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220102254.4U CN217466376U (en) | 2022-01-14 | 2022-01-14 | Ammonia escape sampling system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220102254.4U CN217466376U (en) | 2022-01-14 | 2022-01-14 | Ammonia escape sampling system |
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| Publication Number | Publication Date |
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| CN217466376U true CN217466376U (en) | 2022-09-20 |
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| CN202220102254.4U Active CN217466376U (en) | 2022-01-14 | 2022-01-14 | Ammonia escape sampling system |
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| CN (1) | CN217466376U (en) |
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