CN214150044U - A ammonia escape sampling rifle for among coal-fired flue gas - Google Patents
A ammonia escape sampling rifle for among coal-fired flue gas Download PDFInfo
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- CN214150044U CN214150044U CN202022471882.3U CN202022471882U CN214150044U CN 214150044 U CN214150044 U CN 214150044U CN 202022471882 U CN202022471882 U CN 202022471882U CN 214150044 U CN214150044 U CN 214150044U
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Abstract
The utility model provides an ammonia escape sampling rifle for among coal-fired flue gas can solve the sampling scene and does not have the representativeness, and the problem of test result low on the contrary, the degree of accuracy is poor has important realistic meaning, including the thief rod, its characterized in that: be provided with a plurality of sampling mouths on the thief rod, the rear end of thief rod is provided with nitrogen escape sampling chamber, the inner chamber of thief rod with nitrogen escape sampling chamber is linked together, be provided with the sampling pipe in the nitrogen escape detection chamber, the sampling pipe includes sampling passageway and washes the passageway, being close to of sampling passageway the one end of thief rod is provided with the flue gas air inlet, the other end of sampling passageway is provided with the exhanst gas outlet, the exhanst gas outlet is connected with the sampling pump, the one end of washing the passageway is connected to the flue gas air inlet, the other end of washing the passageway sets into the sparge water entry, still be equipped with heating device in the nitrogen escape detection chamber.
Description
Technical Field
The utility model relates to an ammonia escape check out test set technical field particularly, relates to an ammonia escape sampling rifle that is arranged in coal-fired flue gas.
Background
The Selective Catalytic Reduction (SCR) method for removing nitrogen oxides in flue gas is a coal denitration technology which has the widest application range and the highest denitration efficiency in China at present. The reducing agent used in the denitration by the SCR method is generally ammonia (NH3), on the premise of ensuring the denitration efficiency, a sufficient amount of NH3 needs to be sprayed into the denitration system, SO that the problems of incomplete reaction of NH3 and ammonia exceeding standards (ammonia escape) exist, the ammonia escape is a common problem of the existing SCR denitration system, when the ammonia escape concentration is high, NH3 reacts with SO3 in flue gas to generate NH4HSO4, the operation of downstream equipment such as an air preheater can be seriously influenced, the blockage corrosion is caused, and the safe and stable operation of a unit is seriously influenced. The ammonia escape rate is controlled, and the method is of great importance to the control of ammonia consumption of the unit, the reduction of blockage of the air preheater and the realization of economic and stable operation.
However, the ammonia escape concentration in the flue gas is difficult to accurately measure, and in consideration of inconvenience caused by length problems in the carrying and transportation processes, the ammonia escape sampling gun in the flue gas of the existing thermal power plant is a seamless steel pipe with the length of about 1.5m and the inner diameter of about 10mm, and the middle part of the steel pipe is provided with a simple filtering device (filled with absorbent cotton for filtering). The depth of a vertical flue at an outlet of a denitration system or an inlet of an air preheater is about 3-5 m, and the conventional ammonia escape sampling gun can only sample a fixed position (single point) and is not representative
Also, chinese utility model patent like CN205785987U discloses a system for measuring ammonia escape rate by multipoint uniform sampling, however, the detection effect is not good enough, and when the flue gas passes through the sampling device, due to the material and heat insulation performance of the sampling pipeline, partial gaseous NH4HSO4 may be solidified, resulting in a small measurement result; in addition, during sampling, part of NH3 can be adsorbed on the tube wall, no flushing channel exists, and the measurement result is seriously influenced.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides an ammonia escape sampling rifle for among coal-fired flue gas can solve the sampling scene and do not have the representativeness, and the problem of test result low on the contrary, the degree of accuracy difference has important realistic meaning.
The technical scheme is as follows: the utility model provides an ammonia escape sampling rifle for among coal-fired flue gas, includes the thief rod, its characterized in that: be provided with a plurality of sampling mouths on the thief rod, the rear end of thief rod is provided with nitrogen escape sampling chamber, the inner chamber of thief rod with nitrogen escape sampling chamber is linked together, be provided with the sampling pipe in the nitrogen escape detection chamber, the sampling pipe includes sampling passageway and washes the passageway, being close to of sampling passageway the one end of thief rod is provided with the flue gas air inlet, the other end of sampling passageway is provided with the exhanst gas outlet, the exhanst gas outlet is connected with the sampling pump, the one end of washing the passageway is connected to the flue gas air inlet, the other end of washing the passageway sets into the sparge water entry, still be equipped with heating device in the nitrogen escape detection chamber.
Furthermore, the sampling mouth follows the axial setting of thief rod, the air inlet department of sampling mouth is provided with the filter screen.
Furthermore, in the inner cavity of the sampling rod, a filter box is arranged behind the sampling nozzle, and the flue gas inlet of the sampling pipe extends into the inner cavity of the sampling rod.
Further, the sampling rod comprises a plurality of extension rods, and the extension rods are adjacent to each other and connected together through a locking connector.
Further, be connected wherein one end of extension rod is provided with the sample rod internal thread, and the other end is provided with the sample rod external screw thread, locking connection head includes external screw thread portion and lock nut, locking connection head's external screw thread portion with the sample rod internal thread screw-thread fit of extension rod, lock nut has the internal thread, lock nut respectively with external screw thread portion and the sample rod external screw-thread fit of extension rod, the sample rod external screw thread of extension rod with still be provided with high temperature seal ring between lock nut's the internal thread.
Furthermore, a falling-preventing rod is arranged between the sampling rod and the nitrogen escape sampling chamber.
Furthermore, the heating device comprises an electric heating wire arranged on the side wall of the nitrogen escape sampling chamber, and the electric heating wire is connected to a temperature controller electric tracing interface of the temperature controller through an electric tracing interface.
Furthermore, heat conduction mud is also arranged in the nitrogen escape sampling chamber.
Further, the washing water inlet is connected to a washing water source, and a washing water sealing cover is further arranged at the washing water inlet.
Furthermore, the sampling tube is a quartz tube.
Compared with the prior art, the utility model discloses beneficial effect embodies:
1. the utility model discloses set up a plurality of sampling mouths simultaneously on the thief rod, the sampling point is many, the distribution is wider, and the flue gas of gathering is more representative, and the thief rod makes the flue gas intensive mixing that each measurement station of the different positions of same time was gathered, and measured data is more close the concentration of actually discharging like this.
2. The utility model discloses set up on the sampling pipe and wash the passageway, can wash the partial NH that adsorbs on the pipe wall among the sampling process3And the low test result and the poor accuracy are avoided.
3. The utility model discloses an avoid the flue gas dewfall, absorb the ammonia in the flue gas, set upHeating device improves the flue gas temperature in the sampling pipe to the whole heat tracing of sampling pipe, utilizes the electric heating wire heating and takes a sample through temperature controller constant temperature, still is provided with heat conduction mud in the nitrogen escape sampling chamber and keeps warm, reduces the NH that causes because of the temperature factor3Adsorption is generated in the sampling rod, the sampling rod is made of quartz tube material, and NH can be reduced to a great extent3Is lost by adsorption.
4. The utility model discloses set up the filter screen in sampling mouth department, be provided with the filter cartridge at the rear of sampling mouth to filter the smoke and dust, prevent that the smoke and dust from getting into the absorption bottle and influential to ammonia escape measuring result.
5. The utility model discloses a many extension rods concatenation are set to the thief rod and are formed, through the locking connector between the extension rod, adopt the lock nut integral type, can effectual locking with loosen, easy operation is swift, can conveniently adjust minimum length, portable transportation after using up according to the adjustment sampling gun length of the flue degree of depth freedom.
Drawings
FIG. 1 is a schematic diagram of an ammonia slip sampling gun for use in coal combustion flue gas in specific example 1;
fig. 2 is a schematic view of a sampling tube according to the present invention;
FIG. 3 is a schematic diagram of an ammonia slip sampling gun for use in coal combustion flue gas in specific example 2;
fig. 4 is a schematic view of a locking connector in embodiment 2.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, it should be noted that the drawings provided in the present embodiment illustrate only the basic idea of the present invention in a schematic manner, and only the components related to the present invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of each component may be changed at will in actual implementation, and the component layout form may be more complicated.
Specific example 1:
as shown in fig. 1 and 2, the utility model relates to an ammonia escape sampling gun for coal-fired flue gas, which comprises a sampling rod 1, a plurality of sampling nozzles 2 are arranged on the sampling rod, the sampling nozzles 2 are arranged along the axial direction of the sampling rod 1, a filter screen 3 is arranged at the air inlet of the sampling nozzles 2, a nitrogen escape sampling chamber 4 is arranged at the rear end of the sampling rod 1, the inner cavity of the sampling rod 1 is communicated with the nitrogen escape sampling chamber 4, a sampling tube 5 is arranged in the nitrogen escape detection chamber 4, the sampling tube 5 comprises a sampling channel 501 and a flushing channel 502, a flue gas inlet 503 is arranged at one end of the sampling channel 501 close to the sampling rod 1, a flue gas outlet 504 is arranged at the other end of the sampling channel 501, the flue gas outlet 504 is connected with a sampling pump 6, in the embodiment, an extraction type sampling method is adopted, sample gas is extracted from a flue by the suction force of the sampling pump, then the sample gas is conveyed to an instrument for detection, thereby preventing dust in the flue gas from influencing the detection result, one end of the flushing channel 502 is connected to the flue gas inlet 503, the other end of the flushing channel is provided with a flushing water inlet 505, the flushing water inlet 505 is connected to a flushing water source, and a flushing water sealing cover 7 is further arranged at the flushing water inlet.
In this embodiment, still be equipped with heating device in nitrogen escape detection room 4, heating device is including setting up electric heating wire 8 on the lateral wall of nitrogen escape sampling room 4, electric heating wire 8 is connected to temperature controller electric heat tracing interface 11 of temperature controller 10 through electric heat tracing interface 9, in addition, still be provided with heat conduction mud 12 in the nitrogen escape sampling room and keep warm, for avoiding the flue gas dewfall, absorb the ammonia in the flue gas, set up heating device and to the whole heat tracing of sampling tube, improve the flue gas temperature in the sampling tube, utilize electric heating wire heating and pass through temperature controller constant temperature sample, reduce the NH that causes because of the temperature factor3Adsorption is generated in the sampling rod, the sampling rod is made of quartz tube material, and NH can be reduced to a great extent3Is lost by adsorption.
In this embodiment, a filter box 13 is disposed in the inner cavity of the sampling rod 1 behind the sampling nozzle 2, and the flue gas inlet 503 of the sampling tube 5 extends into the inner cavity of the sampling rod 1.
In addition, in this embodiment, a falling prevention lever 13 is provided between the sampling lever and the nitrogen escape sampling chamber for preventing the sampling lever from being damaged.
In the embodiment, the flue gas is used for coal-fired flue gasAmmonia escape sampling rifle in for ammonia escape detection accuracy is high, the degree of variability is high, the ammonia escape monitoring of the very suitable china denitration operating mode, it sets up a plurality of sampling mouths simultaneously on the thief rod, the sampling point is many, the distribution is wider, the flue gas of gathering is more representative, the thief rod makes the flue gas intensive mixing of each measurement station collection of same time different positions, measured data is more close to the concentration of actual emission like this, set up on the sampling pipe simultaneously and wash the passageway, can wash the partial NH on the pipe wall that adsorbs among the sampling process3And the low test result and the poor accuracy are avoided.
Specific example 2:
as shown in fig. 2, 3 and 4, the utility model discloses an ammonia escape sampling gun for coal-fired flue gas, which comprises a sampling rod 1, a plurality of sampling nozzles 2 are arranged on the sampling rod, the sampling nozzles 2 are arranged along the axial direction of the sampling rod 1, a filter screen 3 is arranged at the air inlet of the sampling nozzles 2, a nitrogen escape sampling chamber 4 is arranged at the rear end of the sampling rod 1, the inner cavity of the sampling rod 1 is communicated with the nitrogen escape sampling chamber 4, a sampling pipe 5 is arranged in the nitrogen escape detection chamber 4, the sampling pipe 5 comprises a sampling channel 501 and a flushing channel 502, a flue gas inlet 503 is arranged at one end of the sampling channel 501 close to the sampling rod 1, a flue gas outlet 504 is arranged at the other end of the sampling channel 501, the flue gas outlet 504 is connected with a sampling pump 6, in the embodiment, an extraction type sampling method is adopted, sample gas is extracted from a flue by the suction force of the sampling pump, and then is conveyed to an instrument for detection, the dust in the flue gas is prevented from influencing the detection result, one end of the flushing channel 502 is connected to the flue gas inlet 503, the other end of the flushing channel is set to be a flushing water inlet 505, the flushing water inlet 505 is connected to a flushing water source, and a flushing water sealing cover 7 is further arranged at the flushing water inlet.
In this embodiment, still be equipped with heating device in the nitrogen escape detection room 4, heating device is including setting up electric heating wire 8 on the lateral wall of nitrogen escape sampling room 4, electric heating wire 8 is connected to temperature controller electric heat tracing interface 11 of temperature controller 10 through electric heat tracing interface 9, in addition, still be provided with heat conduction mud 12 in the nitrogen escape sampling room and keep warm, in order to avoid the flue gas dewfall, absorb the ammonia in the flue gas, set up heating device and to the whole heat tracing of sampling pipe, improve the interior heat tracing of sampling pipeFlue gas temperature is heated by an electric heating wire and is sampled at constant temperature through a temperature controller, so that NH caused by temperature factors is reduced3Adsorption is generated in the sampling rod, the sampling rod is made of quartz tube material, and NH can be reduced to a great extent3Is lost by adsorption.
In this embodiment, a filter box 13 is disposed in the inner cavity of the sampling rod 1 behind the sampling nozzle 2, and the flue gas inlet 503 of the sampling tube 5 extends into the inner cavity of the sampling rod 1.
In addition, in the present embodiment, a drop-preventing lever 17 is provided between the sampling lever and the nitrogen escape sampling chamber for preventing the sampling lever from being damaged.
Furthermore, it has the following structure: the sampling rod comprises a plurality of extension rods 101, and the adjacent extension rods 101 are connected together through locking connectors 14.
Specifically, wherein one end of the extension rod that is connected is provided with thief rod internal thread 15, the other end is provided with thief rod external thread 16, the locking connector includes external screw thread portion 1401 and lock nut 1402, the external screw thread portion 1401 of locking connector and the thief rod internal thread screw thread 15 cooperation of extension rod, lock nut 1402 has internal thread 1403, lock nut 1402 respectively with external screw thread portion 1401 and the thief rod external thread 16 screw-thread fit of extension rod, still be provided with high temperature seal ring 18 between thief rod external thread screw thread 16 of extension rod and lock nut's the internal thread 1403.
In this embodiment, an ammonia escape sampling rifle for among the coal-fired flue gas sets many extension rods to the concatenation and forms, through the locking connector between the extension rod, adopts the lock nut integral type, can effectual locking with loosen, easy operation is swift, can conveniently adjust minimum length, portable transportation after using up according to the adjustment sampling rifle length that the flue degree of depth is free.
When smoke detection is carried out, a sampling pump is driven to operate, negative pressure is formed in a nitrogen escape sampling chamber, smoke in a flue is guided into a sampling rod through the negative pressure, dust in the smoke is preliminarily filtered by a filter screen before the smoke enters the sampling rod, and then secondary filtration is carried out in the sampling rod through a filter box, so that pollution and corrosion of the dust and the like to detection equipment are effectively prevented, and the situation that the detection result is inaccurate due to the dust and the like can also be effectively prevented; then during the flue gas got into the sampling passageway of sampling pipe, gas flowed along the sampling passageway and carried to check out test set in, the temperature controller controlled the flue gas temperature at the sampling in-process to then heat through electric heating wire when the temperature is low excessively.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides an ammonia escape sampling rifle for among coal-fired flue gas, includes the thief rod, its characterized in that: be provided with a plurality of sampling mouths on the thief rod, the rear end of thief rod is provided with nitrogen escape sampling chamber, the inner chamber of thief rod with nitrogen escape sampling chamber is linked together, be provided with the sampling pipe in the nitrogen escape detection chamber, the sampling pipe includes sampling passageway and washes the passageway, being close to of sampling passageway the one end of thief rod is provided with the flue gas air inlet, the other end of sampling passageway is provided with the exhanst gas outlet, the exhanst gas outlet is connected with the sampling pump, the one end of washing the passageway is connected to the flue gas air inlet, the other end of washing the passageway sets into the sparge water entry, still be equipped with heating device in the nitrogen escape detection chamber.
2. The ammonia escape sampling gun for use in coal-fired flue gas according to claim 1, characterized in that: the sampling mouth follows the axial setting of thief rod, the air inlet department of sampling mouth is provided with the filter screen.
3. The ammonia escape sampling gun for use in coal-fired flue gas according to claim 1, characterized in that: in the inner chamber of sample rod, be located the rear of sampling mouth is provided with the filter cartridge, the flue gas air inlet of sampling pipe stretches into in the inner chamber of sample rod.
4. The ammonia escape sampling gun for use in coal-fired flue gas according to claim 1, characterized in that: the sampling rod comprises a plurality of extension rods, and is adjacent to the extension rods, and the extension rods are connected together through a locking connector.
5. The ammonia escape sampling gun for use in coal-fired flue gas according to claim 4, wherein: be connected wherein one end of extension rod is provided with the sample thief internal thread, and the other end is provided with the sample thief external screw thread, locking connection head includes external screw thread portion and lock nut, locking connection head's external screw thread portion with the sample thief internal thread screw-thread fit of extension rod, lock nut has the internal thread, lock nut respectively with external screw thread portion and the sample thief external thread screw-thread fit of extension rod, the sample thief external screw thread of extension rod with still be provided with high temperature seal ring between lock nut's the internal thread.
6. The ammonia escape sampling gun for use in coal-fired flue gas according to claim 1, characterized in that: and an anti-falling rod is arranged between the sampling rod and the nitrogen escape sampling chamber.
7. The ammonia escape sampling gun for use in coal-fired flue gas according to claim 1, characterized in that: the heating device comprises an electric heating wire arranged on the side wall of the nitrogen escape sampling chamber, and the electric heating wire is connected to a temperature controller electric tracing interface of the temperature controller through an electric tracing interface.
8. The ammonia escape sampling gun for use in coal-fired flue gas according to claim 1, characterized in that: and heat conduction mud is also arranged in the nitrogen escape sampling chamber.
9. The ammonia escape sampling gun for use in coal-fired flue gas according to claim 1, characterized in that: the washing water inlet is connected to a washing water source, and a washing water sealing cover is further arranged at the washing water inlet.
10. The ammonia escape sampling gun for use in coal-fired flue gas according to claim 1, characterized in that: the sampling tube adopts a quartz tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022471882.3U CN214150044U (en) | 2020-10-30 | 2020-10-30 | A ammonia escape sampling rifle for among coal-fired flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022471882.3U CN214150044U (en) | 2020-10-30 | 2020-10-30 | A ammonia escape sampling rifle for among coal-fired flue gas |
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| Publication Number | Publication Date |
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| CN214150044U true CN214150044U (en) | 2021-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022471882.3U Active CN214150044U (en) | 2020-10-30 | 2020-10-30 | A ammonia escape sampling rifle for among coal-fired flue gas |
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| CN (1) | CN214150044U (en) |
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- 2020-10-30 CN CN202022471882.3U patent/CN214150044U/en active Active
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