Ammonia escape sampling device for detecting SCR (Selective Catalytic Reduction) honeycomb denitration catalyst

Abstract

The utility model relates to the technical field of sampling devices, and particularly discloses an ammonia escape sampling device for detecting an SCR (Selective Catalytic Reduction) honeycomb denitration catalyst, which comprises an outlet pipeline, the outlet pipeline is communicated with a sampling pipeline, one end of the sampling pipeline close to the outlet pipeline is provided with a valve I, and the sampling pipeline is communicated with a liquid injector and a gas injector. A second valve and a third valve are arranged on pipelines between the liquid injector and the sampling pipeline and between the gas injector and the sampling pipeline respectively, the outer side of one end, away from the outlet pipeline, of the sampling pipeline is sleeved with a bubble absorption pipe, a fourth valve is arranged at the bottom of the bubble absorption pipe, and one end, away from the outlet pipeline, of the bubble absorption pipe is communicated with a volumetric flask. The side wall of the bubble absorption pipe is communicated with an air suction pump through a pipeline, and a fifth valve is arranged on the pipeline between the bubble absorption pipe and the air suction pump. According to the utility model, all the devices are hermetically linked, and all the devices are matched, so that the pipeline of the device is sealed, sampling is not exposed in the whole process, the test is accurate, and the use is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to sampling device technical field, specifically disclose a kind of ammonia escape sampling device for detecting SCR honeycomb denitration catalyst. BACKGROUND

[0002] The performance test of denitration catalyst includes the removal rate of NOx, the escape rate of ammonia and the conversion rate of SO2 / SO3, wherein the escape rate of ammonia directly reflects the performance of catalyst, ammonia escape will waste operating cost, and pollute the environment, so how to accurately test the escape rate of ammonia is crucial.

[0003] According to the detection of ammonia escape rate of flue gas amount and catalyst parameters, one to four catalysts are placed in the reactor, and the chemical sampling ion chromatography method is used to determine the ammonia escape rate. During testing, a pipeline connected by a bubble absorption tube and a hose is inserted into the outlet pipeline of the catalyst reactor for flue gas sampling. The sampling time is 15-30 min, and the sampling flue gas volume is 30-150 L. The ammonia gas in the flue gas is absorbed when passing through the bubble absorption tube. After sampling is completed, the remaining water and ammonia gas in the pipeline are recovered. During the sampling process, there may be incomplete absorption of ammonia gas. The test process of ammonia escape is carried out in air. Due to the test ammonia content of ul / L level and the characteristics of ammonia being easily dissolved in water and volatile, it will cause a non-negligible error in the sampling process, affecting the test accuracy. SUMMARY

[0004] According to the deficiencies in the above prior art, the utility model provides a kind of ammonia escape sampling device for detecting SCR honeycomb denitration catalyst, so that the pipeline of the whole device is sealed as a whole, there is no exposed sampling throughout the process, the test accuracy and test efficiency are improved, and the cost is saved.

[0005] The utility model solves the technical problems thereof by adopting the technical scheme of:

[0006] The ammonia escape sampling device for detecting SCR honeycomb denitration catalyst includes an outlet pipeline, a sampling pipeline is connected to the outlet pipeline, a valve one is arranged at one end of the sampling pipeline close to the outlet pipeline, a liquid injector and a gas injector are sequentially connected to the sampling pipeline through pipelines, a valve two and a valve three are respectively arranged on the pipeline between the liquid injector and the sampling pipeline and on the pipeline between the gas injector and the sampling pipeline, a bubble absorption tube is sleeved outside one end of the sampling pipeline away from the outlet pipeline, a valve four is arranged at the bottom of the bubble absorption tube, a volumetric flask is connected to one end of the bubble absorption tube away from the outlet pipeline, an air suction pump is connected to the side wall of the bubble absorption tube through a pipeline, and a valve five is arranged on the pipeline between the bubble absorption tube and the air suction pump.

[0007] Further, the sampling pipeline is provided with a spray head at the end away from the outlet pipeline, and a plurality of through holes are formed in the spray head.

[0008] Further, the spray head is located in the lower part of the inner cavity of the bubble absorption pipeline.

[0009] Further, the liquid injector and the gas injector are respectively located on the two sides of the sampling pipeline.

[0010] Further, the pipelines connected with the liquid injector and the gas injector respectively extend through the wall of the sampling pipeline to the middle part of the inner cavity of the sampling pipeline.

[0011] Further, the liquid injector is located on the sampling pipeline above the gas injector.

[0012] Further, the air suction pump is arranged on the upper part of the side wall of the bubble absorption pipeline through a pipeline.

[0013] Further, a triangular plug one is arranged on the pipeline between the liquid injector and the valve two, and a triangular plug two is arranged on the pipeline between the gas injector and the valve three.

[0014] Further, a triangular plug three is arranged on the top of the bubble absorption pipeline, and a triangular plug four is arranged on the top of the capacity bottle.

[0015] Further, the triangular plug one, the triangular plug two, the triangular plug three and the triangular plug four are all made of rubber.

[0016] The utility model has the beneficial effects that:

[0017] The utility model discloses a liquid injector, a gas injector, a bubble absorption pipeline, a capacity bottle and an air suction pump are cooperatively arranged, so that the pipeline of the whole device is integrally sealed, the whole process is not exposed to sampling, the recovery process of water and ammonia gas is not affected by the outside world, the testing accuracy and the testing efficiency are improved, and the cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The utility model discloses a structure schematic drawing.

[0019] In the drawing: 1, outlet pipeline 2, sampling pipeline 3, liquid injector 4, gas injector 5, bubble absorption pipeline 6, capacity bottle 7, air suction pump 8, valve one 9, valve two 10, valve three 11, valve four 12, valve five 13, spray head. DETAILED DESCRIPTION

[0020] The utility model is specifically described and explained below in combination with the drawings.

[0021] Example 1

[0022] As Figure 1 Indicated, the for detecting SCR honeycomb denitration catalyst's ammonia escape sampling device, including outlet pipeline 1, the sampling pipeline 2 is communicated on outlet pipeline 1, the valve one 8 is set to the end of sampling pipeline 2 near outlet pipeline 1, the liquid injector 3 and the gas injector 4 are sequentially communicated with on the pipeline of sampling pipeline 2, the pipeline between liquid injector 3 and sampling pipeline 2 and the pipeline between gas injector 4 and sampling pipeline 2 are provided with valve two 9 and valve three 10 respectively, the outside of the end of sampling pipeline 2 away from outlet pipeline 1 is provided with bubble absorption tube 5, the bottom of bubble absorption tube 5 is provided with valve four 11, the end of bubble absorption tube 5 away from outlet pipeline 1 is communicated with volumetric flask 6, the lateral wall of bubble absorption tube 5 is communicated with suction pump 7 through the pipeline, the pipeline between bubble absorption tube 5 and suction pump 7 is provided with valve five 12.

[0023] Through the cooperation of liquid injector 3, gas injector 4, bubble absorption tube 5, volumetric flask 6 and suction pump 7, the pipeline of the whole device is sealed as a whole, the whole process is not exposed to sampling, and the sampling device is not affected by the outside world during the recovery of ammonia gas, the testing accuracy and testing efficiency are improved, and the cost is saved.

[0024] The end of sampling pipeline 2 away from outlet pipeline 1 is provided with a spray head 13, and a plurality of through holes are formed in the spray head 13.

[0025] The spray head 13 is located in the lower part of the inner cavity of the bubble absorption tube 5.

[0026] The plurality of through holes on the spray head 13 can disperse the gas and liquid transported by the sampling pipeline 2, increase the contact area of the gas and the absorption liquid, and improve the sampling efficiency.

[0027] The liquid injector 3 and the gas injector 4 are located on the two sides of the sampling pipeline 2 respectively.

[0028] The pipelines connected by the liquid injector 3 and the gas injector 4 all extend to the middle part of the inner cavity of the sampling pipeline 2 by penetrating the pipe wall of the sampling pipeline 2.

[0029] The liquid injector 3 is located on the sampling pipeline 2 above the gas injector 4.

[0030] The suction pump 7 is arranged on the upper part of the lateral wall of the bubble absorption tube 5 through the pipeline.

[0031] A triangular plug one is arranged on the pipeline between the liquid injector 3 and the valve two 9, and a triangular plug two is arranged on the pipeline between the gas injector 4 and the valve three 10.

[0032] The top of the bubble absorption tube 5 is provided with a triangular plug three, and the top of the volumetric flask 6 is provided with a triangular plug four.

[0033] The materials of the triangular plug one, the triangular plug two, the triangular plug three and the triangular plug four are all rubber.

[0034] Working principle and process:

[0035] When in use, the pressure of the suction pump 7 is set as a constant value, so that the flue gas is sucked into the bubble absorption tube 5, and the absorption liquid is used to absorb the ammonia gas in the flue gas, and then the liquid injector 3 and the gas injector 4 are used to collect the absorption liquid in the bubble absorption tube 5 and the water and ammonia gas in the sampling pipeline 2 into the volumetric flask 6;

[0036] Step one: open the valve two 9 and the valve five 12, start the suction pump 7, and add an appropriate amount of absorption liquid into the bubble absorption tube 5 through the liquid injector 3;

[0037] Step two: close the valve two 9, open the valve one 8, so that the flue gas is dispersed into the bubble absorption tube 5 through the spray head 13 and the ammonia gas is dissolved into the absorption liquid;

[0038] Step three: close the valve one 8 and the valve five 12, open the valve three 10 and the valve four 11, and use the gas injector 4 to inject the standard gas into the sampling pipeline 2, so that the ammonia gas in the sampling pipeline 2 is completely absorbed by the absorption liquid in the bubble absorption tube 5, and then the absorption liquid is squeezed into the volumetric flask 6;

[0039] Step four: close the valve three 10 and the valve four 11, open the valve two 9 and the valve five 12, and add an appropriate amount of absorption liquid in the liquid injector 3 into the bubble absorption tube 5 through the sampling pipeline 2, to flush the sampling pipeline 2 and the bubble absorption tube 5;

[0040] Step five: close the valve two 9 and the valve five 12, open the valve three 10 and the valve four 11, and use the gas in the gas injector 4 to squeeze all the absorption liquid in the bubble absorption tube 5 into the volumetric flask 6;

[0041] Step six: repeat steps four and five once, and then fix the solution in the volumetric flask 6 to the scale line to end the sampling;

[0042] Step seven: close the valve three 10 and the valve four 11, and measure the concentration of ammonia in the volumetric flask 6.

Claims

1. A sampling device for detecting ammonia slip in SCR honeycomb denitrification catalyst, comprising an outlet pipeline (1), characterized in that, A sampling pipeline (2) is connected to the outlet pipeline (1). A valve (8) is installed at the end of the sampling pipeline (2) near the outlet pipeline (1). A liquid injector (3) and a gas injector (4) are connected to the sampling pipeline (2) in sequence through pipes. A valve (9) and a valve (10) are installed on the pipe between the liquid injector (3) and the sampling pipeline (2) and on the pipe between the gas injector (4) and the sampling pipeline (2), respectively. A bubble absorption tube (5) is sleeved on the outer side of the end of the sampling pipeline (2) away from the outlet pipeline (1). A valve (11) is installed at the bottom of the bubble absorption tube (5). A volumetric flask (6) is connected to the end of the bubble absorption tube (5) away from the outlet pipeline (1). A suction pump (7) is connected to the side wall of the bubble absorption tube (5) through pipes. A valve (12) is installed on the pipe between the bubble absorption tube (5) and the suction pump (7).

2. The ammonia slip sampling device for detecting SCR honeycomb denitrification catalyst according to claim 1, characterized in that, A nozzle (13) is provided at one end of the sampling pipeline (2) away from the outlet pipeline (1), and several through holes are provided on the nozzle (13).

3. The ammonia slip sampling device for detecting SCR honeycomb denitrification catalyst according to claim 2, characterized in that, The nozzle (13) is located in the lower part of the inner cavity of the bubble absorption tube (5).

4. The ammonia slip sampling device for detecting SCR honeycomb denitrification catalyst according to claim 1, characterized in that, The liquid syringe (3) and the gas syringe (4) are located on both sides of the sampling pipeline (2).

5. The ammonia slip sampling device for detecting SCR honeycomb denitrification catalyst according to claim 1, characterized in that, The pipes connecting the liquid syringe (3) and the gas syringe (4) both extend through the wall of the sampling pipe (2) to the middle of the inner cavity of the sampling pipe (2).

6. The ammonia slip sampling device for detecting SCR honeycomb denitrification catalyst according to claim 1, characterized in that, The liquid syringe (3) is located on the sampling line (2) above the gas syringe (4).

7. The ammonia slip sampling device for detecting SCR honeycomb denitrification catalyst according to claim 1, characterized in that, The suction pump (7) is installed on the upper side wall of the bubble absorption tube (5) through a pipe.

8. The ammonia slip sampling device for detecting SCR honeycomb denitrification catalyst according to claim 1, characterized in that, A triangular plug is installed on the pipe between the liquid injector (3) and valve two (9), and a triangular plug is installed on the pipe between the gas injector (4) and valve three (10).

9. The ammonia slip sampling device for detecting SCR honeycomb denitrification catalyst according to claim 8, characterized in that, The top of the bubble absorption tube (5) is provided with a triangular stopper three, and the top of the volumetric flask (6) is provided with a triangular stopper four.

10. The ammonia slip sampling device for detecting SCR honeycomb denitrification catalyst according to claim 9, characterized in that, Triangular plug one, triangular plug two, triangular plug three and triangular plug four are all made of rubber.

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