CN218470301U

CN218470301U - Denitration ammonia escape on-line analysis sampling pretreatment system

Info

Publication number: CN218470301U
Application number: CN202222046869.2U
Authority: CN
Inventors: 赵康; 赵成军; 邵永成
Original assignee: Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
Current assignee: Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
Priority date: 2022-08-04
Filing date: 2022-08-04
Publication date: 2023-02-10
Anticipated expiration: 2032-08-04

Abstract

The utility model discloses an online analysis sample pretreatment systems of denitration ammonia escape belongs to denitration ammonia escape analysis and measurement technical field in the flue gas, has solved accurate detection difficulty, equipment calibration maintenance difficulty, the unsafe problem of testing result when carrying out the real-time supervision analysis to the ammonia escape. The utility model discloses an including the sample probe case, switch ball valve, external measurement air chamber and rack, the sample probe incasement is equipped with the sample and visits pipe and carborundum filter. The utility model discloses a switch the ball valve through adjusting the second grade and make the flue gas get into the sample and visit in the pipe, filter the transmission and detect to the rack via the carborundum filter, adjust the one-level and switch the ball valve and filter the relief pressure valve, sweep the second flue. The utility model discloses can adopt the bypass to extract the sample gas normal position filtration treatment on the spot, adopt self-control electric tracing pipe cable to connect, realize that sample gas is the same with the flue gas completely, improve and detect the precision, protect accurate check out test set not receive the damage, the calibration of being convenient for is maintained, and application method is simple accurate.

Description

Denitration ammonia escape on-line analysis sampling pretreatment system

Technical Field

The utility model belongs to the technical field of denitration ammonia escape analysis measures in the flue gas, concretely relates to online sample analysis pretreatment systems of denitration ammonia escape.

Background

Nitrogen oxides are one of main components of air pollution, 70% of the emission of the nitrogen oxides in China comes from the direct combustion of coal, and thermal power plants, steel plants and cement plants are one of main sources of the emission of the nitrogen oxides in China. In recent years, the emission of nitrogen oxides in China rapidly increases with the rapid increase of energy consumption, and the situation of air pollution is severe. The flue gas denitration technology is one of the main methods for controlling the emission of nitric oxide in China. At present, the Selective Catalytic Reduction (SCR) and the selective non-catalytic reduction (SNCR) flue gas denitration which are more and mature in process are applied at home and abroad, and both the two methods need to spray reducing agent ammonia into the flue gas to reduce nitrogen oxides in the flue gas into nitrogen. In order to ensure that the nitrogen oxides fully react and avoid new pollution caused by excessive ammonia, the ammonia gas escape needs to be monitored and analyzed in real time so as to optimize the injection amount of the reducing agent ammonia and improve the denitration efficiency.

At present, the device for monitoring and analyzing ammonia escape in real time is generally an online laser ammonia escape gas analysis system, and is used for monitoring the content of ammonia before and after denitration. The other is to install the sampling probe on the flue, and after sampling, the flue gas is conveyed to the filtering, detecting and analyzing equipment through a pipeline, and because the tube pass is long, the collected flue gas is easily adsorbed on the tube wall, so that the detection result and the actual deviation are large, and the detection result is inaccurate.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a denitration ammonia escape online sampling analysis pretreatment systems to it is longer to solve online sampling analysis method tube side, leads to the unsafe problem of testing result.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an online sampling analysis pretreatment systems of denitration ammonia escape, includes sample probe case and rack, and the sample probe incasement is equipped with the sample and visits pipe, carborundum filter, annular electric heater, and the sample is visited the pipe and is linked to each other with the carborundum filter, is equipped with sample gas access mouth and sample gas discharge port on the rack, and the carborundum filter passes through self-control electric tracing pipe cable and connects the detection pipeline, and the detection pipeline links to each other with sample gas access mouth, and the sampling pump is connected to sample gas discharge port.

As a further improvement, the probe box and the detection pipeline are both provided with two sets, and the detection pipeline is provided with a second-stage switching ball valve.

As the utility model discloses a further improvement, the second grade switches the ball valve and connects the branch pipe that sweeps, sweeps the branch union coupling and sweeps the house steward, sweeps and is equipped with the one-level on the house steward and switches the ball valve, filters the relief pressure valve and connects the source pipe of sweeping the gas.

As the utility model discloses a further improvement is equipped with external measurement air chamber in the rack, and external measurement air chamber one end is equipped with laser emitter, and the other end is equipped with laser receiver, and external measurement air chamber links to each other with appearance gas access mouth and appearance gas discharge port.

As a further improvement, the external measurement air chamber is also provided with an insulation box.

As a further improvement, the sampling pump adopts a Venturi type aspirator and is connected with a compressed air pipe.

As the utility model discloses a further improvement, sample probe case and inboard flange fixed connection, inboard flange and outside flange bolted connection, the outside flange sets up on first flue, the sample is visited the pipe and is passed inboard flange, outside flange and stretch into in the first flue.

The utility model has the advantages that:

1. the utility model discloses a bypass extraction sample gas normal position filtration treatment on the spot has saved the remote sample gas transmission between sampling probe and the filtration system, makes sample gas state identical with the flue gas, adopts self-regulation electric tracing pipe cable to connect simultaneously, ensures that the ammonia does not have the absorption in the sampling process, has improved the detection precision.

2. The bypass is adopted to extract the sample gas, the in-situ filtration treatment is carried out on the sample gas, the precision is improved, and meanwhile, the precision detection equipment is protected from being damaged.

3. The detection device is arranged in the cabinet by adopting the external detection equipment, so that the calibration and maintenance are convenient.

Drawings

Fig. 1 is a schematic structural view of the present invention;

the reference numerals have the following meanings: 1-a first flue; 2-sampling probe tube; 31-a flange; 32-a flange; 4-a silicon carbide filter; 5-ring electric heater; 6-self-regulating electric tracing pipe cable; 7-sampling probe box; 8-two-stage switching ball valve; 9-first-stage switching ball valve; 10-a purge gas source pipe; 11-filter pressure relief valve; 12-sample gas inlet; 13-a laser emitter; 14-external measurement air chamber; 15-a laser receiver; 16-sample gas exhaust; 17-a pneumatic sampling pump; 18-compressed air pipe; 19-an incubator; 20-a cabinet; 21-a second flue; 22-detecting the pipeline; 23-purging the branch pipe; 24-purge manifold.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

As shown in the figure, denitration ammonia escape on-line sampling analysis pretreatment system is characterized in that: including sample probe case 7 and rack 20, be equipped with sample probe 2, carborundum filter 4, annular electric heater 5 in the sample probe case 7, sample probe 2 links to each other with carborundum filter 4, is equipped with sample gas access 12 and sample gas discharge port 16 on the rack 20, and carborundum filter 4 passes through self-control electric heat tracing pipe cable 6 and connects detection pipeline 22, and detection pipeline 22 links to each other with sample gas access 12, and sample gas discharge port 16 connects sampling pump 17.

The probe box 7 and the detection pipeline 22 are both provided with two groups, and the detection pipeline 22 is provided with a two-stage switching ball valve 8, so that the switching of the smoke detection and gas circuit purging working states of the first flue 1 and the second flue 21 is realized.

The second-stage switching ball valve 8 is connected with a purging branch pipe 23, the purging branch pipe 23 is connected with a purging main pipe 24, a first-stage switching ball valve 9 and a filtering and reducing valve 11 are arranged on the purging main pipe 24, and the filtering and reducing valve 11 is connected with a purging gas source pipe 10 to provide purging gas for the first flue 1 and the second flue 21.

An external measurement air chamber 14 is arranged in the machine cabinet 20, one end of the external measurement air chamber 14 is provided with a laser transmitter 13, the other end of the external measurement air chamber is provided with a laser receiver 15, and the external measurement air chamber 14 is connected with a sample gas inlet 12 and a sample gas outlet 16.

An insulation can 19 is arranged outside the external measurement air chamber 14, so that the initial state of the flue gas is maintained for the insulation of the flue gas, and the detection accuracy is improved.

The sampling pump 17 adopts a Venturi type aspirator, and the sampling pump 17 is connected with a compressed air pipe 18.

Sample probe case 7 and inboard flange 31 fixed connection, inboard flange 31 and outside flange 32 bolted connection, outside flange 32 sets up on first flue 1, sample probe tube 2 passes inboard flange 31, outside flange 32 and stretches into in the first flue 1.

A use method of a denitration ammonia escape online sampling analysis pretreatment system comprises the following steps:

a. the sampling probe pipes on two sides are respectively connected with a first flue and a second flue;

b. adjusting a two-stage switching ball valve to enable the flue gas from the first flue to flow to an external measurement air chamber and enable the purging gas from a purging gas source pipe to flow to a second flue;

c. opening a pneumatic sampling pump, enabling the flue gas of the first flue to enter a sampling probe tube, filtering by a silicon carbide filter, and transmitting to a cabinet for detection;

d. opening a first-stage switching ball valve and a filtering pressure reducing valve, allowing the purging gas to enter a second flue, and purging a silicon carbide filter and a sampling probe pipe arranged on the side of the second flue for sampling detection of the second flue;

e. after the flue gas detection in the first flue is finished, the second-stage switching ball valve is switched, the flue gas in the second flue is subjected to sampling detection, and the silicon carbide filter and the sampling probe tube on the side of the first flue are swept.

Claims

1. The utility model provides an online analysis sample pretreatment systems of denitration ammonia escape which characterized in that: including sample probe case (7) and rack (20), be equipped with sample probe pipe (2) in sample probe case (7), carborundum filter (4), annular electric heater (5), sample probe pipe (2) link to each other with carborundum filter (4), be equipped with sample gas access mouth (12) and sample gas discharge port (16) on rack (20), carborundum filter (4) are through self-regulating electric heat tracing pipe cable (6) connection detection pipeline (22), detection pipeline (22) link to each other with sample gas access mouth (12), sample pump (17) are connected in sample gas discharge port (16).

2. The denitration ammonia escape on-line analysis sampling pretreatment system of claim 1, wherein: the sampling probe box (7) and the detection pipeline (22) are both provided with two groups, and the detection pipeline (22) is provided with a secondary switching ball valve (8).

3. The denitration ammonia slip online analysis sampling pretreatment system of claim 2, characterized in that: the second-stage switching ball valve (8) is connected with the purging branch pipe (23), the purging branch pipe (23) is connected with the purging main pipe (24), the purging main pipe (24) is provided with a first-stage switching ball valve (9) and a filtering and reducing valve (11), and the filtering and reducing valve (11) is connected with the purging gas source pipe (10).

4. The denitration ammonia slip online analysis sampling pretreatment system of any one of claims 1 to 3, wherein: the measuring device is characterized in that an external measuring air chamber (14) is arranged in the cabinet (20), one end of the external measuring air chamber (14) is provided with a laser transmitter (13), the other end of the external measuring air chamber is provided with a laser receiver (15), and the external measuring air chamber (14) is connected with a sample gas inlet (12) and a sample gas outlet (16).

5. The denitration ammonia escape on-line analysis sampling pretreatment system of claim 4, wherein: an insulation can (19) is arranged outside the external measurement air chamber (14).

6. The denitration ammonia escape on-line analysis sampling pretreatment system of claim 1, wherein: the sampling pump (17) adopts a Venturi type aspirator, and the sampling pump (17) is connected with a compressed air pipe (18).

7. The denitration ammonia escape on-line analysis sampling pretreatment system of claim 1, wherein: sample probe case (7) and inboard flange (31) fixed connection, inboard flange (31) and outside flange (32) bolted connection, outside flange (32) set up on first flue (1), sample probe pipe (2) pass inboard flange (31), outside flange (32) stretch into in first flue (1).