CN-121994665-A - Sealing detection device, adjusting method and measuring pipeline for air coal powder flow measuring pipeline

CN121994665ACN 121994665 ACN121994665 ACN 121994665ACN-121994665-A

Abstract

The invention belongs to the technical field of thermal power and provides a sealing detection device, an adjusting method and a measuring pipeline of a wind coal powder flow measuring pipeline, wherein the sealing detection device comprises a measuring pipeline communicating valve arranged at one end of the measuring pipeline, which is close to a primary wind pipeline, an annular air channel arranged at one end of the measuring pipeline, which is close to an optical window, and a first pressure detection mechanism and a second pressure detection mechanism which are arranged in the annular air channel; the annular air duct is provided with a sealing air regulating valve, the first pressure detection mechanism is close to the primary air duct, the second pressure detection mechanism is close to the annular air duct, and the primary air pulverized coal airflow at the opening of the primary air main duct is blocked from entering the measuring duct by meeting an annular air duct air curtain between the optical window and the straight-through duct, so that pollution to the optical window can be effectively reduced, and the accuracy of pulverized coal concentration measurement is improved.

Inventors

Ge Zongnian
SHEN SHULAN
HAO ZHENHUA
FANG NING
YANG XIAOLEI
ZHANG QUANRUI
LI CHAO
CHEN ZHIQIANG
ZHANG BING
LI WEI
SONG QINGHAO
GU HUIHUI
SHAO MIN
YUE ZHONGSHI
XUE GUANGWEI

Assignees

山东电力工程咨询院有限公司

Dates

Publication Date: 20260508
Application Date: 20260119

Claims (10)

1. The device is characterized by comprising a measuring pipeline arranged on a primary air pipeline, an optical window arranged in the measuring pipeline, a measuring pipeline communication valve arranged at one end of the measuring pipeline close to the primary air pipeline, an annular air channel arranged at one end of the measuring pipeline close to the optical window, and a first pressure detection mechanism and a second pressure detection mechanism arranged in the annular air channel; The annular air duct is provided with a sealing air regulating valve, the first pressure detection mechanism is close to the primary air duct, the second pressure detection mechanism is close to the annular air duct, the comparison relation between the sealing air pressure and the primary air pressure is determined according to the pressure detection of the first pressure detection mechanism and the pressure detection of the second pressure detection mechanism, and the opening of the measuring duct communicating valve and the opening of the sealing air regulating valve are regulated according to the comparison relation between the sealing air pressure and the primary air pressure, so that pulverized coal airflow is prevented from entering the measuring duct.
2. The device for detecting the sealing of the wind-coal powder flow measuring pipeline according to claim 1, wherein the first pressure detecting mechanism comprises a first wind-proof sleeve penetrating through the measuring pipeline and a first detecting box connected with the first wind-proof sleeve outside the measuring pipeline, a first connecting arm is arranged in the first detecting box through a first supporting frame, one end of the first connecting arm penetrates through the first detecting box and the first wind-proof sleeve to enter the measuring pipeline, a first pressure detecting target is arranged at one end of the first connecting arm located in the measuring pipeline, and a first pressure contact and a second pressure contact are respectively arranged at two sides of the first connecting arm in the first detecting box.
3. The apparatus of claim 2, wherein the first connecting arm is provided with a first pressure trimming lever and a second pressure trimming lever on both sides thereof, respectively.
4. The sealing detection device for the wind-coal powder flow measurement pipeline according to claim 1, wherein the second pressure detection mechanism comprises a second wind-proof sleeve penetrating through the measurement pipeline and a second detection box connected with the second wind-proof sleeve outside the measurement pipeline, a second connecting arm is arranged in the second detection box through a second support frame, one end of the second connecting arm penetrates through the second detection box and the second wind-proof sleeve to enter the measurement pipeline, a second pressure detection target is arranged at one end of the second connecting arm located in the measurement pipeline, and a third pressure contact is arranged in the second detection box.
5. The apparatus of claim 4, wherein a third pressure fine tuning rod is disposed between the second cartridge and the second arm.
6. The method for adjusting the sealing detection device of the air-coal powder flow measurement pipeline is characterized by comprising the steps of determining the magnitude comparison relation between the sealing wind pressure and the primary wind pressure according to the pressure detection of the first pressure detection mechanism and the pressure detection of the second pressure detection mechanism, and adjusting the opening of a communication valve of the measurement pipeline and the opening of a sealing wind adjusting valve according to the magnitude comparison relation between the sealing wind pressure and the primary wind pressure to prevent coal powder flow from entering the measurement pipeline.
7. The method for adjusting the sealing detection device of the air-pulverized coal flow measuring pipeline according to claim 6, wherein after the sealing air pressure is normal, the sealing air adjusting valve is slightly opened by a first preset opening degree, and then the pipeline communication valve is slightly opened by a second preset opening degree; If the third pressure contact is not triggered, the primary air pressure is equal to or smaller than the sealing air pressure, and the opening degrees of the sealing air regulating valve and the measuring pipeline communicating valve are maintained unchanged; If the first pressure contact is triggered, the sealing wind pressure is larger than the primary wind pressure, the measuring pipeline communicating valve is opened, the pressure signal is repeatedly detected after a preset time delay, if the second pressure contact is triggered, the sealing wind pressure is smaller than the primary wind pressure, the sealing wind regulating valve is correspondingly increased in pressure, the pressure signal of the first pressure detecting mechanism is repeatedly detected after the preset time delay, if the first pressure detecting mechanism has no pressure triggering signal, the opening degree of the sealing wind regulating valve is opened, the measuring pipeline communicating valve is opened, the pressure detecting mechanism signal is repeatedly detected after the preset time delay, and the starting process is finished until the measuring pipeline communicating valve is fully opened.
8. The method for adjusting a sealing and detecting device of a wind-coal powder flow measuring pipeline according to claim 7, wherein after the starting is completed, the operation condition is adjusted, and the operation condition adjustment comprises normal wind pressure adjustment, abnormal wind pressure and stop operation.
9. The method for adjusting a sealing detection device of a pulverized coal flow measuring pipeline according to claim 8, wherein if a third pressure contact is triggered, the primary air pressure is higher than the sealing air pressure, the sealing air adjusting valve correspondingly increases the pressure and alarms or prompts abnormality, and the pressure signal is repeatedly detected after a predetermined time delay; if the third pressure contact is triggered continuously for the third time, the primary air pressure is still larger than the sealing air pressure, the current sealing state cannot ensure the cleaning of an optical window, the wind pressure is prompted to be abnormal and the measuring pipeline communication valve is closed; If the third pressure contact is not triggered, the primary air pressure is equal to or smaller than the sealing air pressure, the sealing air regulating valve pressure is maintained unchanged, if the first pressure contact is triggered, the sealing air pressure is larger than the primary air pressure, the opening of the sealing air regulating valve is reduced, the pressure signal is repeatedly detected after a preset time delay, if the second pressure contact is triggered, the sealing air pressure is smaller than the primary air pressure, the sealing air regulating valve correspondingly increases the pressure and repeatedly detects the pressure signal after the preset time delay, and if the first pressure detecting mechanism does not have a pressure trigger signal, the sealing air regulating valve pressure is maintained and the pressure signal is repeatedly detected after the preset time delay.
10. A wind coal powder flow measurement pipe, characterized in that the wind coal powder flow measurement pipe seal detection device according to any one of claims 1 to 5 is used.

Description

Sealing detection device, adjusting method and measuring pipeline for air coal powder flow measuring pipeline Technical Field The invention belongs to the technical field of thermal power, and particularly relates to a sealing detection device for a wind coal powder flow measurement pipeline, an adjusting method and a measurement pipeline. Background With the increase of the power generation duty ratio of the new energy, more accurate and timely combustion adjustment and control measures are needed to meet the deep peak regulation demands of the thermal power generating unit. The most direct and effective way to achieve the above objective is to measure the coal fines reliably. The optical method has the characteristics of high stability, high precision and high sensitivity, and becomes a feasible scheme for primary air pulverized coal flow detection. However, after the direct-fired pulverizing system of the thermal power generating unit boiler is put into operation, the inside of the primary air pipeline is in a positive pressure powder feeding state, and part of pulverized coal airflow can enter the optical measurement pipeline from the primary air pipeline, because the retention of the pulverized coal airflow in the measurement pipeline and the pollution to an optical window can influence the measurement accuracy. Disclosure of Invention In order to solve the problems, the invention provides a sealing detection device, an adjusting method and a measuring pipeline of an air pulverized coal flow measuring pipeline, an annular air flue air curtain between an optical window and a straight-through pipeline meets primary air pulverized coal airflow at an opening of a primary air main pipeline, the entry of the pulverized coal airflow into the measuring pipeline is blocked, the pollution to the optical window can be effectively reduced, and the accuracy of pulverized coal concentration measurement is improved. In order to achieve the above object, in a first aspect, the present invention provides a sealing detection device for a wind pulverized coal flow measuring pipeline, which adopts the following technical scheme: the utility model provides a wind buggy flow measurement pipeline seals detection device, includes the measurement pipeline that sets up on the primary air pipeline, sets up the optics window in the measurement pipeline, sets up the measurement pipeline UNICOM valve of the one end that the measurement pipeline is close to on the primary air pipeline, sets up the annular wind channel that the measurement pipeline is close to one end of optics window to and set up first pressure detection mechanism and second pressure detection mechanism in the annular wind channel; The annular air duct is provided with a sealing air regulating valve, the first pressure detection mechanism is close to the primary air duct, the second pressure detection mechanism is close to the annular air duct, the comparison relation between the sealing air pressure and the primary air pressure is determined according to the pressure detection of the first pressure detection mechanism and the pressure detection of the second pressure detection mechanism, and the opening of the measuring duct communicating valve and the opening of the sealing air regulating valve are regulated according to the comparison relation between the sealing air pressure and the primary air pressure, so that pulverized coal airflow is prevented from entering the measuring duct. Further, the first pressure detection mechanism comprises a first windproof sleeve penetrating through the measurement pipeline and a first detection box connected with the first windproof sleeve outside the measurement pipeline, a first connecting arm is arranged in the first detection box through a first supporting frame, one end of the first connecting arm penetrates through the first detection box and the first windproof sleeve to enter the measurement pipeline, a first pressure detection target is arranged at one end of the first connecting arm, located in the measurement pipeline, of the first connecting arm, and a first pressure contact and a second pressure contact are respectively arranged at two sides of the first connecting arm in the first detection box. Further, a first pressure fine tuning rod and a second pressure fine tuning rod are respectively arranged on two sides of the first connecting arm. Further, the second pressure detection mechanism comprises a second windproof sleeve penetrating through the measurement pipeline and a second detection box connected with the second windproof sleeve outside the measurement pipeline, a second connecting arm is arranged in the second detection box through a second support frame, one end of the second connecting arm penetrates through the second detection box and the second windproof sleeve to enter the measurement pipeline, a second pressure detection target is arranged at one end of the second connecting arm, located in the me