CEMS (Continuous Emission Monitoring System) flow anomaly detection device

Abstract

The utility model discloses a CEMS (continuous emission monitoring system) flow anomaly detection device which comprises a sampling pipeline connected into a flue gas pipeline in parallel, a flue gas sampling probe, a three-way electromagnetic valve, a condenser, a flue gas sampling pump, a flue gas flow measuring device and a CEMS flue gas analyzer are sequentially arranged on the sampling pipeline in the flue gas diversion direction, and the sampling end of the flue gas sampling probe extends into the flue gas pipeline. A purging power device is in butt joint with the three-way electromagnetic valve, and purging airflow generated by the purging power device is guided to a front-end filter of the flue gas sampling probe through opening and closing circulation control of the three-way electromagnetic valve. According to the utility model, the flue gas sampling probe is purged to remove blockage, so that the measurement requirement of a real-time monitoring flue gas analyzer can be met, and the environmental protection monitoring reliability of a CEMS (Continuous Emission Monitoring System) is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of smoke environmental monitoring in thermal power plants, and in particular relates to a CEMS flow anomaly detection device. Background Art

[0002] The CEMS flue gas environmental monitoring system is mainly used to monitor the flue gas component content at the boiler SCR inlet and outlet, and the desulfurization absorption tower inlet and outlet, monitor the waste gas emission indicators of the power plant, and supervise whether the power plant emits qualified flue gas in accordance with environmental protection requirements; if the flue gas emissions exceed the standard or the monitoring data is distorted, the environmental protection department will impose different levels of penalties on the power plant.

[0003] CEMS flue gas environmental monitoring system is mostly used in the fields of flue gas monitoring in power plants to monitor the concentration of flue gas emissions in real time. Since the system requires real-time monitoring of flue gas, and the concentration of fly ash in flue gas is high, the CEMS flue gas analyzer has high requirements for flue dust, and the flue dust needs to be filtered and processed. A low-fineness filter device is installed at the front end of the sampling. This method is bound to cause the filter to be blocked. In severe cases, the sampling pump will not be able to extract flue gas. The CEMS flue gas analyzer will trigger the system shutdown due to low flow, resulting in the loss of monitoring of environmental protection data, data distortion, and ultimately environmental protection assessment. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a CEMS flow anomaly detection device, which can meet the measurement requirements of the real-time monitoring flue gas analyzer by purging the flue gas sampling probe to remove blockage and improve the reliability of CEMS environmental monitoring.

[0005] Technical solution: To achieve the above-mentioned purpose, a CEMS flow anomaly detection device of the utility model comprises a sampling pipe connected in parallel to the flue gas pipe, on which a flue gas sampling probe, a three-way solenoid valve, a condenser, a flue gas sampling pump, a flue gas flow measuring device and a CEMS flue gas analyzer are sequentially arranged along the flue gas diversion direction, the sampling end of the flue gas sampling probe extends into the flue gas pipe, and a purge power device is connected to the three-way solenoid valve. The purge airflow generated by the purge power device is diverted to the front end filter of the flue gas sampling probe through the opening and closing flow control of the three-way solenoid valve.

[0006] Furthermore, the pipe section of the sampling pipe between the three-way solenoid valve and the condenser is a high-temperature electric heating pipe.

[0007] Furthermore, a purge pipeline is connected between the purge power device and the three-way solenoid valve, and a purge electric valve is arranged on the purge pipeline.

[0008] Furthermore, the purge power device is a purge blower or a high-pressure gas cylinder storing high-pressure purge gas.

[0009] Furthermore, the drainage port of the condenser is connected to a peristaltic drainage pump.

[0010] Furthermore, it comprises a central control system, and the flue gas flow measurement device is interlocked with the three-way solenoid valve, the purge electric valve, and the purge power device through the central control system.

[0011] Furthermore, the flue gas flow measurement device includes a glass rotor flowmeter and a flow monitoring sensor, and the flow monitoring sensor is connected to the central control system for signal transmission.

[0012] Beneficial effect: The utility model can meet the measurement requirements of real-time monitoring of flue gas analyzers by purging and unblocking the flue gas sampling probe, and improve the reliability of CEMS environmental monitoring. When the flow rate is monitored to be low, the measurement is triggered to maintain and switch the three-way solenoid valve to purge the front-end filter of the flue gas sampling probe. If the flow rate is still measured to be lower than the set value after the purge is put into operation, the low sampling flow alarm is triggered, and the operation and maintenance personnel are informed in time to perform online maintenance, avoid abnormal shutdown of environmental monitoring equipment, and effectively reduce abnormal shutdown of equipment and the risk of environmental assessment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a schematic diagram of the overall structure of the utility model. DETAILED DESCRIPTION

[0014] The utility model is further described below in conjunction with the accompanying drawings.

[0015] As attached Figure 1 As shown, a CEMS flow anomaly detection device includes a sampling pipe 12 connected in parallel to a flue gas pipe 1, on which a flue gas sampling probe 2, a three-way solenoid valve 3, a condenser 4, a flue gas sampling pump 5, a flue gas flow measurement device 6 and a CEMS flue gas analyzer 7 are sequentially arranged along the flue gas diversion direction, the sampling end of the flue gas sampling probe 2 extends into the flue gas pipe 1, and a purge power device 9 is connected to the three-way solenoid valve 3. The purge airflow generated by the purge power device 9 is diverted to the front end filter 20 of the flue gas sampling probe 2 through the opening and closing flow control of the three-way solenoid valve 3. The utility model can meet the measurement requirements of the real-time monitoring flue gas analyzer by purging and unblocking the flue gas sampling probe 2, and improve the reliability of CEMS environmental monitoring. When the flow rate is monitored to be low, the measurement is triggered to maintain and switch the three-way solenoid valve 3 to purge the front-end filter 20 of the flue gas sampling probe 2. If the flow rate is still measured to be lower than the set value after the purge is put into operation, the low sampling flow alarm is triggered, and the operation and maintenance personnel are informed in time to perform online maintenance, so as to avoid abnormal shutdown of environmental monitoring equipment and effectively reduce abnormal shutdown of equipment and the risk of environmental assessment.

[0016] It is worth noting that in order to avoid pre-cooling of the sampled flue gas in the process of diversion of the pipe part between the three-way solenoid valve 3 and the condenser 4 to produce condensate and affect the flue gas sampling and diversion, in the present invention, the pipe part of the sampling pipe 12 between the three-way solenoid valve 3 and the condenser 4 is a high-temperature electric heating pipe to maintain the temperature of the flue gas before it is diverted to the condenser 4 to avoid condensation.

[0017] A purge pipe is connected between the purge power device 9 and the three-way solenoid valve 3, and a purge electric valve 8 is provided on the purge pipe to increase protection for the purge power device 9 and prevent accidental discharge of flue gas from the purge pipe or air pollution caused by failure of the three-way solenoid valve 3.

[0018] In the present utility model, preferably, the purge power device 9 is a purge blower or a high-pressure gas cylinder storing high-pressure purge gas.

[0019] The drainage port of the condenser 4 is connected to a peristaltic drainage pump 11 , and the condensate is discharged under the pumping of the peristaltic drainage pump 11 .

[0020] The utility model includes a central control system 10, which is a PLC system or a DCS system. The flue gas flow measurement device 6 is interlocked with the three-way solenoid valve 3, the purge electric valve 8, and the purge power device 9 through the central control system 10. More specifically, the flue gas flow measurement device 6 includes a glass rotor flowmeter 61 and a flow monitoring sensor 62, and the flow monitoring sensor 62 is connected to the central control system 10 for signal transmission. The specific monitoring process is as follows:

[0021] The flue gas flow measurement device 6 and the CEMS flue gas analyzer 7 are put into operation and start working. The flue gas sampling pump 5 and the peristaltic drainage pump 11 are pneumatically driven. The flue gas diversion sequence is: flue gas sampling probe 2 → three-way solenoid valve 3 → condenser 4 → flue gas sampling pump 5 → flue gas flow measurement device 6 → CEMS flue gas analyzer 7 → emptying; the interval period is 4 hours, and the central control system 10 automatically triggers the purge function to start, triggers the measurement to hold, starts the purge power device 9, opens the purge electric valve 8, and switches the three-way solenoid valve 3 to purge the flue gas sample The front-end filter 20 of the probe will blow away the particles blocked in the front-end filter 20, thereby relieving the blockage of the front-end filter 20. After purging for 1 minute, the three-way solenoid valve 3 is closed and the flue gas measurement is restarted. If the central control system 10 determines that the flow rate is low based on the signal data sent by the flow monitoring sensor 62, the measurement is triggered to hold and switch the three-way solenoid valve 3 to purge the front-end filter 20 of the flue gas sampling probe. If the flow rate is still measured to be lower than the set value after the purge is put into operation, the low sampling flow alarm is triggered to inform the operation and maintenance personnel.

[0022] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A CEMS flow anomaly detection device, characterized in that: The invention comprises a sampling pipeline (12) connected in parallel to a flue gas pipeline (1); a flue gas sampling probe (2), a three-way electromagnetic valve (3), a condenser (4), a flue gas sampling pump (5), a flue gas flow measurement device (6) and a CEMS flue gas analyzer (7) are sequentially arranged on the sampling pipeline (12) along the direction of flue gas diversion; a sampling end of the flue gas sampling probe (2) extends into the flue gas pipeline (1); a purge power device (9) is connected to the three-way electromagnetic valve (3); a purge airflow generated by the purge power device (9) is directed to a front filter (20) of the flue gas sampling probe (2) through the opening and closing flow control of the three-way electromagnetic valve (3).

2. A CEMS flow anomaly detection device according to claim 1, characterized in that: The pipe section of the sampling pipe (12) between the three-way solenoid valve (3) and the condenser (4) is a high-temperature electric heating pipe.

3. A CEMS flow anomaly detection device according to claim 1, characterized in that: A purge pipeline is connected between the purge power device (9) and the three-way electromagnetic valve (3), and a purge electric valve (8) is arranged on the purge pipeline.

4. A CEMS flow anomaly detection device according to claim 1 or 3, characterized in that: The purge power device (9) is a purge fan or a high-pressure gas cylinder storing high-pressure purge gas.

5. The CEMS flow anomaly detection device according to claim 1, characterized in that: The liquid discharge port of the condenser (4) is connected to a peristaltic liquid discharge pump (11).

6. The CEMS flow anomaly detection device according to claim 3, characterized in that: It comprises a central control system (10), wherein the smoke flow measurement device (6) is interlocked with a three-way electromagnetic valve (3), a purge electric valve (8), and a purge power device (9) through the central control system (10).

7. A CEMS flow anomaly detection device according to claim 6, characterized in that: The flue gas flow measurement device (6) comprises a glass rotor flowmeter (61) and a flow monitoring sensor (62), and the flow monitoring sensor (62) is connected to the central control system (10) for signal transmission.

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