CN215218867U - Boiler thermal state primary wind speed test hole measuring device with sealing and blowing functions - Google Patents
Boiler thermal state primary wind speed test hole measuring device with sealing and blowing functions Download PDFInfo
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- CN215218867U CN215218867U CN202120732738.2U CN202120732738U CN215218867U CN 215218867 U CN215218867 U CN 215218867U CN 202120732738 U CN202120732738 U CN 202120732738U CN 215218867 U CN215218867 U CN 215218867U
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Abstract
The utility model discloses a wind speed test hole measuring device is once gone up to boiler thermal state with seal and sweep function belongs to coal-fired power generation technical field, is applicable to power plant pulverized coal boiler. The device comprises a sealing manual valve, a purging manual valve, a pressure relief manual valve, a purging branch pipe, a pressure relief branch pipe, a sealing pipe, a hole measuring main body, a hole measuring sealing head and the like, can perform good sealing in the thermal primary wind speed measuring process, and prevents wind-powder mixed hot wind from being sprayed out; the hole measuring device can be effectively blown, so that the blockage of a probe of the wind speed measuring instrument caused by the powder accumulation of the hole measuring device is prevented; meanwhile, disturbance to airflow in a thermal-state primary wind speed measurement area can be avoided, and measurement accuracy is guaranteed; in a hot-state primary wind speed measurement test, the device can effectively protect testers after being put into operation, and provides basic conditions for the accuracy of test results.
Description
Technical Field
The utility model relates to a wind speed test hole measuring device is once gone up to boiler thermal state with seal and sweep function belongs to coal-fired power generation technical field, is applicable to power plant pulverized coal boiler.
Background
At present, a pulverized coal boiler of a power station is one of the most widely used boiler types in the thermal power industry of China, and the running condition of a boiler type pulverizing system directly influences the safety and the economical efficiency of the operation of the boiler. The primary air speed is one of the key operation parameters of the pulverizing system, the primary air speed not only determines the stability of ignition and combustion, but also influences the airflow rigidity of the primary air, and if the primary air speed is too high, the ignition can be delayed, the combustion is unstable, and even the fire is extinguished; the problem of coal dust deposition, pipe blockage and the like is easily caused by the phenomenon of 'tempering' possibly caused by too low primary air speed, burner nozzle burning loss and the like, so that the control and monitoring of the primary air speed of each powder pipe of the boiler are particularly important.
After the boiler is overhauled, in the cold ventilation and aerodynamic field test of the boiler before cold start, a primary wind speed is usually calibrated, namely, the measured data of the primary wind speed is compared with the online data of the DCS, and a conversion coefficient is given to correct the online data. Under the cold state ventilation condition of the boiler, high-concentration coal powder is not carried in the primary powder pipe, the primary air temperature of the powder pipe is close to the ambient temperature, the air speed measuring condition is better, the cold state primary air speed test hole measuring device is mostly formed by welding a carbon steel pipe and the primary powder pipe, and the structure is simpler.
When the boiler pulverizing system is in hot-state operation, if the primary wind speed deviation of a part of coal mills DCS in the primary wind speed online monitoring system is large, the reasonable primary wind speed cannot be accurately adjusted in the operation of the boiler, and whether the risk of pipe blockage exists is also determined by operating personnel. Under the hot operation of the boiler, the wind speed of each primary powder pipe of each coal mill is measured and compared with the online wind speed of the primary powder pipe of the DCS, so that the measured wind speed, the wind speed conversion coefficient and other data of the primary powder pipe of each coal mill are obtained, and powerful support can be provided for preventing the explosion of the coal pulverizing system.
When the boiler operates in a hot state, primary air of the powder preparation system is in a wind-powder mixed multiphase flow state, has the characteristics of high flow rate, high temperature, high concentration and the like, is subjected to primary wind speed test, and needs to be well sealed in the thermal-state primary wind speed measurement process so as to prevent wind-powder mixed hot air from being sprayed out; effective purging of the hole measuring device is considered, so that the probe of the wind speed measuring instrument is prevented from being blocked due to powder accumulation in the hole measuring device; and the air flow in the hot primary wind speed measurement area is not disturbed so as to ensure the measurement accuracy. At present, a suitable hole measuring device for a primary hot-state wind speed test of a boiler does not exist, so that testing personnel cannot be effectively protected in the primary hot-state wind speed test, and the accuracy of a test result cannot be guaranteed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a boiler thermal state wind speed test hole measuring device who has sealed and sweep function that structural design is reasonable.
The utility model provides a technical scheme that above-mentioned problem adopted is: a boiler thermal state primary wind speed test hole measuring device with sealing and purging functions is characterized by comprising a sealing manual valve, a purging manual valve, a pressure relief manual valve, a purging branch pipe, a pressure relief branch pipe, a sealing pipe, a hole measuring main body and a hole measuring end enclosure; the one end of survey hole main part is connected perpendicularly at the lateral wall of a wind powder pipe, and the one end of surveying hole main part is provided with the guide plate to the one end of surveying hole main part is provided with surveys the hole export, the other end of surveying hole main part passes through the screw and links to each other with the survey hole head, the hole import has been seted up in the center of surveying hole head, sealed tube and pressure release branch pipe are connected respectively in the both sides of surveying hole main part, and sealed tube and pressure release branch pipe all are 45 contained angles with the survey hole main part and arrange, the branch pipe that sweeps is connected perpendicularly with the pressure release branch pipe, sealed manual valve is installed on the sealed tube, the manual valve that sweeps is installed on sweeping the branch pipe, the manual valve that relieves pressure is installed on pressure release branch pipe, sealed tube and sweep the branch pipe and link to each other with the compressed air pipeline for the appearance respectively.
Furthermore, the hole measuring main body, the sealing pipe, the purging branch pipe and the pressure relief branch pipe are all made of low-carbon steel, the hole measuring main body is connected with the primary air powder pipe, the sealing pipe and the pressure relief branch pipe in a welding mode, and the purging branch pipe is connected with the pressure relief branch pipe in a welding mode; the inner diameter of the hole measuring main body is 60mm, the wall thickness of the hole measuring main body is 3m, the inner diameters of the sealing pipe, the purging branch pipe and the pressure relief branch pipe are 15mm, and the wall thickness of the sealing pipe, the purging branch pipe and the pressure relief branch pipe is 2 mm; the aperture of the hole measuring inlet is 15mm, the hole measuring inlet is sealed by a bolt and a nut, the head of the bolt is positioned in the hole measuring main body, and the nut is positioned outside the hole measuring main body.
Furthermore, a connecting hole is formed in the side wall of the primary air powder pipe, and the hole measuring main body is communicated with the inside of the primary air powder pipe through a hole measuring outlet through the connecting hole; the diameter of the projection of the outlet of the measuring hole on the vertical plane of the central line of the main body of the measuring hole is 37.5 mm; the connecting hole is superposed with the bottom end of the measuring hole outlet, and the top end of the measuring hole outlet is flush with the top end of the measuring hole inlet; the guide plate is low carbon steel material, and its wall thickness is 2mm, the guide plate is 45 contained angles with the survey hole main part and arranges, the one end of guide plate is connected in the inner wall of surveying the hole main part through the welding mode, the other end of guide plate and the outer wall contact of a wind powder pipe.
When in use, the process is as follows:
1. after preparing a test measuring instrument, opening a sealed manual valve; the valve has the main functions of sealing and finishing the first purging in the hole measuring main body;
2. after the purging manual valve is opened, the sealing manual valve is closed; because the pressure relief branch pipe and the hole measuring main body form an included angle of 45 degrees, the air flow in the pressure relief branch pipe is close to the primary air powder pipe side towards the hole measuring main body, and the step is used for finishing high-pressure purging in the hole measuring main body and reducing sealing air pressure when the hole measuring end socket is opened;
3. disassembling the hole-measuring end enclosure in a spiral mode, disassembling a nut and a bolt of a hole-measuring inlet on the hole-measuring end enclosure, and then installing the hole-measuring end enclosure on the hole-measuring main body;
4. opening a sealing manual valve, closing a purging manual valve, and opening a pressure relief manual valve; the operation steps mainly include adjusting the flowing direction and the flow of the sealing wind and reducing the disturbance to the airflow in the thermal-state primary wind speed measurement area;
5. the test and measurement instrument sequentially passes through the measurement hole inlet and the measurement hole outlet, and the upper edge of the test and measurement instrument is tangent to the top ends of the measurement hole inlet and the measurement hole outlet because the top end of the measurement hole outlet is flush with the top end of the measurement hole inlet, so that the stability of the test and measurement instrument can be maintained;
6. test testing work was started.
Compared with the prior art, the utility model, have following advantage and effect: the utility model designs a boiler thermal state primary wind speed test hole measuring device with sealing and blowing functions aiming at the characteristics of high flow velocity, high temperature, high concentration and the like that primary wind of a powder making system of a pulverized coal boiler of a power station is wind-powder mixed multiphase flow state, can perform good sealing in the thermal state primary wind speed measuring process and prevent wind-powder mixed hot wind from being sprayed out; the hole measuring device can be effectively swept, so that the blockage of a probe of the wind speed measuring instrument caused by the powder accumulation of the hole measuring device is prevented; meanwhile, disturbance to airflow in a thermal-state primary wind speed measurement area is avoided, and measurement accuracy is guaranteed; in a hot-state primary wind speed measurement test, the device can effectively protect testers after being put into operation, and provides basic conditions for the accuracy of test results.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic sectional view of the plane a-a in fig. 1.
Fig. 3 is a schematic sectional view of the plane B-B in fig. 1.
In the figure: the device comprises a sealing manual valve 1, a blowing manual valve 2, a pressure relief manual valve 3, a blowing branch pipe 4, a pressure relief branch pipe 5, a sealing pipe 6, a hole measuring main body 7, a hole measuring seal head 8, a hole measuring inlet 9, a connecting hole 10, a hole measuring outlet 11, a guide plate 12, a primary air powder pipe 13 and a compressed air pipeline 14 for the instrument.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
A330 MW unit boiler of a certain power plant is produced by Wuhan boiler plants, the model is WGZ1100/17.45-5, the model is a subcritical parameter, natural circulation steam drum, medium-speed grinding positive pressure direct-fired pulverizing system, a four-corner tangential combustion mode, a volumetric three-bin rotary air preheater, bituminous coal for combustion and solid slag discharge. The coal pulverizing system is provided with 4 double-inlet and double-outlet coal mills, and a parameter table of coal mill equipment is shown in a table 1.
TABLE 1 DOUBLE-INPUT AND DOUBLE-OUTPUT COAL GRINDER EQUIPMENT PARAMETERS
When the boiler pulverizing system is in hot-state operation, the primary wind speed deviation of a part of coal mills DCS in the wind speed online monitoring system is large, the reasonable primary wind speed cannot be accurately adjusted in the operation of the boiler, and the judgment of whether pipe blockage risks exist by operating personnel is not facilitated. Under the hot operation of the boiler, the wind speed measurement of each primary powder pipe of the A, B, C, D coal mill is mainly carried out, and the wind speed measurement is compared with the online wind speed of the primary powder pipe of the DCS system, so that the data such as the actually measured wind speed, the actually measured wind speed relative deviation, the DCS wind speed and the actually measured wind speed absolute deviation, the wind speed conversion coefficient and the like of each primary powder pipe of the coal mill are obtained.
In the embodiment, a boiler thermal state primary wind speed test hole measuring device with sealing and blowing functions is adopted, and the device mainly comprises a sealing manual valve 1, a blowing manual valve 2, a pressure relief manual valve 3, a blowing branch pipe 4, a pressure relief branch pipe 5, a sealing pipe 6, a hole measuring main body 7 and a hole measuring end enclosure 8; one end of the hole measuring main body 7 is perpendicularly connected to the side wall of the primary air powder pipe 13, a guide plate 12 is arranged at one end of the hole measuring main body 7, a hole measuring outlet 11 is formed in one end of the hole measuring main body 7, the other end of the hole measuring main body 7 is connected with the hole measuring end socket 8 through threads, a hole measuring inlet 9 is formed in the center of the hole measuring end socket 8, the sealing pipe 6 and the pressure relief branch pipe 5 are respectively connected to two sides of the hole measuring main body 7, the sealing pipe 6 and the pressure relief branch pipe 5 are arranged at an included angle of 45 degrees with the hole measuring main body 7, the pressure relief branch pipe 4 is perpendicularly connected with the pressure relief branch pipe 5, the manual sealing valve 1 is installed on the sealing pipe 6, the manual purging valve 2 is installed on the purging branch pipe 4, the manual pressure relief valve 3 is installed on the pressure relief branch pipe 5, and the sealing pipe 6 and the purging branch pipe 4 are respectively connected with a compressed air pipeline 14 for an instrument.
The hole measuring main body 7, the sealing pipe 6, the purging branch pipe 4 and the pressure relief branch pipe 5 are all made of low-carbon steel, the hole measuring main body 7 is connected with the primary air powder pipe 13, the sealing pipe 6 and the pressure relief branch pipe 5 in a welding mode, and the purging branch pipe 4 is connected with the pressure relief branch pipe 5 in a welding mode; the inner diameter of the hole measuring main body 7 is 60mm, the wall thickness is 3m, the inner diameters of the sealing pipe 6, the purging branch pipe 4 and the pressure relief branch pipe 5 are 15mm, and the wall thickness is 2 mm; the aperture of the hole measuring inlet 9 is 15mm, the hole measuring inlet is sealed by a bolt and a nut, the head of the bolt is positioned in the hole measuring main body 7, and the nut is positioned outside the hole measuring main body 7.
The side wall of the primary air powder pipe 13 is provided with a connecting hole 10, and the hole measuring main body 7 is communicated with the inside of the primary air powder pipe 13 through a hole measuring outlet 11 and the connecting hole 10; the diameter of the projection of the hole measuring outlet 11 on the vertical plane of the central line of the hole measuring main body 7 is 37.5 mm; the connecting hole 10 is superposed with the bottom end of the measuring hole outlet 11, and the top end of the measuring hole outlet 11 is flush with the top end of the measuring hole inlet 9; guide plate 12 is low carbon steel matter, and its wall thickness is 2mm, and guide plate 12 is 45 contained angles with survey hole main part 7 and arranges, and the one end of guide plate 12 is connected in the inner wall of surveying hole main part 7 through welding mode, and the other end of guide plate 12 contacts with the outer wall of one time wind powder pipe 13.
The specific operation steps are as follows:
1. after a test measuring instrument is prepared, opening the sealed manual valve 1 to complete the first purging of the interior of the measuring hole main body 7;
2. after the purging manual valve 2 is opened, the sealing manual valve 1 is closed, and high-pressure purging in the hole measuring main body 7 is completed;
3. disassembling the hole-measuring seal head 8 in a spiral mode, disassembling a nut and a bolt of a hole-measuring inlet 9 on the hole-measuring seal head 8, and then installing the hole-measuring seal head 8 on the hole-measuring main body 7;
4. opening the sealing manual valve 1, closing the purging manual valve 2, opening the pressure relief manual valve 3, adjusting the flow direction and flow of sealing wind, and reducing the disturbance to the airflow in the thermal-state primary wind speed measurement area;
5. sequentially penetrating a test and measurement instrument through the measurement hole inlet 9 and the measurement hole outlet 11, so that the upper edge of the test and measurement instrument is tangent to the top ends of the measurement hole inlet 9 and the measurement hole outlet 11, and the stability of the test and measurement instrument is kept;
6. test testing work was started.
Under the hot-state operation of the boiler, the wind speed of each primary powder pipe of the A, B, C, D coal mill is mainly measured in the test, and is compared with the online wind speed of the primary powder pipe of the DCS; the test instrument: hot-line anemometers (japanese jiaye model 6162); the primary powder pipe wind speed measurement result of the coal mill is as follows:
working condition parameters are as follows: the load of the unit is 230MW, and the opening of a primary powder pipe bypass hot air valve of a D coal mill is 30%; wind speed measurements were made on 4 primary powder tubes of the D mill by a hot wire anemometer, and the results are shown in table 2. The test result objectively and accurately reflects the actual condition of the primary powder pipe wind speed of the boiler powder making system, and powerful support is provided for preventing the explosion of the powder making system.
TABLE 2D coal pulverizer primary pulverizer tube wind speed measurement results
Remarking: the absolute deviation value is obtained by subtracting the measured value from the DCS value, and the conversion coefficient is obtained by dividing the measured value by the DCS value.
Those not described in detail in this specification are well within the skill of the art.
In addition, it should be noted that the above contents described in the present specification are only illustrations of the structure of the present invention. All equivalent changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions by those skilled in the art may be made to the described embodiments without departing from the scope of the invention as defined in the accompanying claims.
Claims (5)
1. A boiler thermal state primary wind speed test hole measuring device with sealing and blowing functions is characterized by comprising a sealing manual valve (1), a blowing manual valve (2), a pressure relief manual valve (3), a blowing branch pipe (4), a pressure relief branch pipe (5), a sealing pipe (6), a hole measuring main body (7) and a hole measuring end enclosure (8); one end of the hole measuring main body (7) is vertically connected to the side wall of the primary air powder pipe (13), one end of the hole measuring main body (7) is provided with a guide plate (12), one end of the hole measuring main body (7) is provided with a hole measuring outlet (11), the other end of the hole measuring main body (7) is connected with the hole measuring sealing head (8) through threads, the center of the hole measuring sealing head (8) is provided with a hole measuring inlet (9), the sealing pipe (6) and the pressure relief branch pipe (5) are respectively connected to two sides of the hole measuring main body (7), the sealing pipe (6) and the pressure relief branch pipe (5) are arranged at an included angle of 45 degrees with the hole measuring main body (7), the pressure relief branch pipe (4) is vertically connected with the pressure relief branch pipe (5), the manual sealing valve (1) is installed on the sealing pipe (6), the manual purging valve (2) is installed on the pressure relief branch pipe (4), and the pressure relief valve (3) is installed on the pressure relief branch pipe (5), the sealing pipe (6) and the blowing branch pipe (4) are respectively connected with a compressed air pipeline (14) for the instrument.
2. The primary hot air speed test hole measuring device with the sealing and purging functions for the boiler according to claim 1, wherein the hole measuring main body (7), the sealing pipe (6), the purging branch pipe (4) and the pressure relief branch pipe (5) are all made of low-carbon steel, the hole measuring main body (7), the primary air powder pipe (13), the sealing pipe (6) and the pressure relief branch pipe (5) are connected in a welding mode, and the purging branch pipe (4) and the pressure relief branch pipe (5) are also connected in a welding mode.
3. The boiler thermal state primary wind speed test hole measuring device with the sealing and purging functions as claimed in claim 1, wherein the inner diameter of the hole measuring main body (7) is 60mm, the wall thickness of the hole measuring main body is 3m, the inner diameters of the sealing pipe (6), the purging branch pipe (4) and the pressure relief branch pipe (5) are 15mm, and the wall thicknesses of the sealing pipe, the purging branch pipe and the pressure relief branch pipe are 2 mm; the aperture of the hole measuring inlet (9) is 15mm, the hole measuring inlet is sealed by a bolt and a nut, the head of the bolt is positioned in the hole measuring main body (7), and the nut is positioned outside the hole measuring main body (7).
4. The boiler thermal state primary wind speed test hole measuring device with the sealing and purging functions as claimed in claim 1, wherein a connecting hole (10) is formed in the side wall of the primary wind powder pipe (13), and the hole measuring main body (7) is communicated with the inside of the primary wind powder pipe (13) through a hole measuring outlet (11) through the connecting hole (10); the diameter of the projection of the hole measuring outlet (11) on the vertical plane of the central line of the hole measuring main body (7) is 37.5 mm; the connecting hole (10) is superposed with the bottom end of the measuring hole outlet (11), and the top end of the measuring hole outlet (11) is flush with the top end of the measuring hole inlet (9).
5. The boiler thermal state primary wind speed test hole measuring device with the sealing and purging functions as claimed in claim 1, wherein the guide plate (12) is made of low carbon steel, the wall thickness of the guide plate is 2mm, the guide plate (12) and the hole measuring main body (7) are arranged at an included angle of 45 degrees, one end of the guide plate (12) is connected to the inner wall of the hole measuring main body (7) in a welding mode, and the other end of the guide plate (12) is in contact with the outer wall of the primary wind powder pipe (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120732738.2U CN215218867U (en) | 2021-04-09 | 2021-04-09 | Boiler thermal state primary wind speed test hole measuring device with sealing and blowing functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120732738.2U CN215218867U (en) | 2021-04-09 | 2021-04-09 | Boiler thermal state primary wind speed test hole measuring device with sealing and blowing functions |
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| CN215218867U true CN215218867U (en) | 2021-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120732738.2U Active CN215218867U (en) | 2021-04-09 | 2021-04-09 | Boiler thermal state primary wind speed test hole measuring device with sealing and blowing functions |
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| CN (1) | CN215218867U (en) |
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2021
- 2021-04-09 CN CN202120732738.2U patent/CN215218867U/en active Active
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