Reverse blowing device of sampling tube for measuring coke oven gas amount by using pore plate

Abstract

The utility model discloses a sampling pipe reverse blowing device for measuring coke oven gas amount by a pore plate, which relates to the technical field of instrument maintenance and comprises the pore plate, a first pressure tapping pipeline, a second pressure tapping pipeline, a first three-way valve, a differential pressure transmitter, a first heat preservation heat tracing steam pipeline and a second heat preservation heat tracing steam pipeline, one end of the first pressure tapping pipeline is communicated with the coke oven gas pipeline at the front end of the pore plate, one end of the second pressure tapping pipeline is communicated with the coke oven gas pipeline at the rear end of the pore plate, and one ends, far away from the coke oven gas pipeline, of the first pressure tapping pipeline and the second pressure tapping pipeline are communicated with the differential pressure transmitter; the first heat preservation tracing steam pipeline is communicated with the first pressure tapping pipeline, and a fifth valve is arranged on the first heat preservation tracing steam pipeline; the flow measuring device has the advantages that the flow measuring device is simple in structure and convenient to use, and the flow measuring accuracy of the orifice plate can be effectively guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of instrument maintenance technology, and in particular to a backflushing device for a sampling tube for measuring coke oven gas volume using an orifice plate. Background Technology

[0002] Coke oven gas contains impurities such as tar, naphthalene, and dust, making it difficult to accurately measure its flow rate using conventional methods. Orifice plates are typically used for measurement. However, during the use of orifice plates to measure coke oven gas volume, sampling tube blockage frequently occurs, leading to measurement distortion.

[0003] Therefore, there is an urgent need for a device that can effectively solve the problem of measurement distortion caused by blockage of the pressure guide tube while ensuring the accuracy of pressure detection. Utility Model Content

[0004] The purpose of this invention is to provide a backflushing device for sampling tubes of orifice plate for measuring coke oven gas volume, so as to solve the problems existing in the prior art. It has a simple structure, is easy to use, and effectively ensures the accuracy of orifice plate flow measurement.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a backflushing device for a sampling pipe of coke oven gas volume measurement via an orifice plate, comprising: an orifice plate, a first pressure tapping pipe, a second pressure tapping pipe, a first three-way valve, a differential pressure transmitter, a first insulated and heated steam pipe, and a second insulated and heated steam pipe. The orifice plate is installed coaxially within the coke oven gas pipeline. One end of the first pressure tapping pipe is connected and communicates with the coke oven gas pipeline at the front end of the orifice plate, and is aligned with the front end of the orifice plate. A first valve and a second valve are provided on the first pressure tapping pipe. One end of the second pressure tapping pipe is connected and communicates with the coke oven gas pipeline at the rear end of the orifice plate, and is aligned with the rear end of the orifice plate. A third valve and a fourth valve are provided on the second pressure tapping pipe. The first pressure tapping pipe and the second pressure tapping pipe... The end of each pipeline away from the coke oven gas pipeline is connected to the differential pressure transmitter via the first three-way valve. The differential pressure transmitter is used to measure the differential pressure generated by the medium flowing through the orifice plate and can transmit the signal to the calculation unit for calculation and output the result to the display unit. One end of the first heat-insulating and heat-tracing steam pipeline is connected to the heat-insulating and heat-tracing steam equipment, and the other end is connected to the first pressure tapping pipeline between the first valve and the second valve. A fifth valve is provided on the first heat-insulating and heat-tracing steam pipeline. One end of the second heat-insulating and heat-tracing steam pipeline is connected to the heat-insulating and heat-tracing steam equipment, and the other end is connected to the second pressure tapping pipeline between the third valve and the fourth valve. A sixth valve is provided on the second heat-insulating and heat-tracing steam pipeline.

[0007] Preferably, it also includes a second three-way valve and a third three-way valve, wherein the first heat-insulating and heat-tracing steam pipeline is connected to the first pressure-tapping pipeline through the second three-way valve, and the second heat-insulating and heat-tracing steam pipeline is connected to the second pressure-tapping pipeline through the third three-way valve.

[0008] Preferably, it also includes a seventh valve and an eighth valve, wherein the seventh valve is disposed on the first heat-tracing steam pipeline and the eighth valve is disposed on the second heat-tracing steam pipeline.

[0009] Preferably, the steam pressure of the first heat-tracing steam pipeline is 0.3 to 0.6 MPa, and the temperature is not lower than 150°C.

[0010] Preferably, the steam pressure of the second heat-tracing steam pipeline is 0.3 to 0.6 MPa, and the temperature is not lower than 150°C.

[0011] Preferably, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, and the eighth valve are shut-off valves or ball valves.

[0012] The present invention achieves the following technical advantages over the prior art:

[0013] This invention provides a back-purge device for a sampling pipe of coke oven gas volume measurement via an orifice plate. The orifice plate can uniformly receive the impact of coke oven gas, ensuring the stability of the gas flow field and thus ensuring measurement accuracy, avoiding measurement errors caused by flow field disturbance due to orifice plate installation position deviation. The first pressure tapping line is accurately connected and aligned with the front end of the orifice plate, accurately acquiring the pressure signal at the orifice plate front end, ensuring accurate differential pressure measurement. The first and second valves allow for flexible control of the pipeline opening and closing and airflow, accurately controlling steam entry into the pipeline for purging during the purging operation. The second pressure tapping line is similar to the first, accurately acquiring the pressure signal at the rear end of the orifice plate, providing the necessary conditions for accurate differential pressure measurement. The third and fourth valves enable flexible opening and closing control of the pipeline, each performing its function under different operating conditions, ensuring normal switching between measurement and purging functions. The first and second pressure tapping lines are connected to a differential pressure transmitter via a first three-way valve, transmitting the pressure signals before and after the orifice plate to the differential pressure transmitter, enabling accurate differential pressure measurement and providing a basis for accurate flow calculation. The signal is transmitted to the computing unit and the results are output to the display unit, realizing the acquisition, processing, and intuitive display of flow data, ensuring the acquisition and analysis of flow data during production. The connection method of the first insulated and heated steam pipeline provides a steam purging path for the pressure tapping pipeline at the front end of the orifice plate. The fifth valve can control the steam on and off, allowing the insulated and heated steam to be introduced into the first pressure tapping pipeline when needed to purge the pipeline and the front end of the orifice plate, effectively removing impurities and ensuring measurement accuracy. In conjunction with the first insulated and heated steam pipeline, a sixth valve controls the steam entry to purge the pressure tapping pipeline at the rear end of the orifice plate and the rear end of the orifice plate, further improving the purging effect of the overall device and ensuring the cleanliness of the entire measurement system. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A schematic diagram of the backflushing device for the orifice plate measuring coke oven gas volume sampling tube provided by this utility model;

[0016] In the diagram: 1. Orifice plate; 2. Coke oven gas pipeline; 3. First pressure tapping pipeline; 4. First valve; 5. Second valve; 6. Second pressure tapping pipeline; 7. Third valve; 8. Fourth valve; 9. First three-way valve; 10. Differential pressure transmitter; 11. First insulated and heated steam pipeline; 12. Fifth valve; 13. Second insulated and heated steam pipeline; 14. Sixth valve; 15. Seventh valve; 16. Eighth valve. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] The purpose of this invention is to provide a backflushing device for sampling tubes of orifice plate for measuring coke oven gas volume, so as to solve the problems existing in the prior art. It has a simple structure, is easy to use, and effectively ensures the accuracy of orifice plate flow measurement.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] This utility model provides a backflushing device for a sampling tube used for measuring coke oven gas volume using an orifice plate, such as... Figure 1As shown, the system includes: an orifice plate 1, a first pressure tapping pipe 3, a second pressure tapping pipe 6, a first three-way valve 9, a differential pressure transmitter 10, a first insulated and heated steam pipe 11, and a second insulated and heated steam pipe 13. The orifice plate 1 is installed coaxially within the coke oven gas pipeline 2. One end of the first pressure tapping pipe 3 is connected to and communicates with the coke oven gas pipeline 2 at the front end of the orifice plate 1, and is aligned with the front end of the orifice plate 1. A first valve 4 and a second valve 5 are installed on the first pressure tapping pipe 3. One end of the second pressure tapping pipe 6 is connected to and communicates with the coke oven gas pipeline 2 at the rear end of the orifice plate 1, and is aligned with the rear end of the orifice plate 1. A third valve 7 and a fourth valve 8 are installed on the second pressure tapping pipe 6. The first pressure tapping pipe 3 and the second pressure tapping pipe 6 are located away from the coke oven gas pipeline. One end of each pipe 2 is connected to a differential pressure transmitter 10 via a first three-way valve 9. The differential pressure transmitter 10 is used to measure the differential pressure generated by the medium flowing through the orifice plate 1, and can transmit the signal to the calculation unit for calculation and output the result to the display unit. One end of the first heat-insulating and heat-tracing steam pipe 11 is connected to the heat-insulating and heat-tracing steam equipment, and the other end is connected to the first pressure tapping pipe 3 between the first valve 4 and the second valve 5. A fifth valve 12 is provided on the first heat-insulating and heat-tracing steam pipe 11. One end of the second heat-insulating and heat-tracing steam pipe 13 is connected to the heat-insulating and heat-tracing steam equipment, and the other end is connected to the second pressure tapping pipe 6 between the third valve 7 and the fourth valve 8. A sixth valve 14 is provided on the second heat-insulating and heat-tracing steam pipe 13.

[0021] The orifice plate 1 can uniformly receive the impact of coke oven gas, ensuring the stability of the gas flow field and thus ensuring the accuracy of the measurement. This avoids measurement errors caused by flow field disturbance due to installation deviation of the orifice plate 1. The first pressure tapping line 3 is accurately connected to and aligned with the front end of the orifice plate 1, accurately acquiring the pressure signal at the front end of the orifice plate 1, providing a guarantee for accurate differential pressure measurement. The first valve 4 and the second valve 5 are set to flexibly control the pipeline opening and closing and the airflow, accurately controlling the steam entering the pipeline for purging during purging. The second pressure tapping line 6 is similar to the first pressure tapping line 3, accurately acquiring the pressure signal at the rear end of the orifice plate 1, providing the necessary conditions for accurate differential pressure measurement. The third valve 7 and the fourth valve 8 realize flexible opening and closing control of the pipeline, each performing its function under different operating conditions, ensuring the normal switching between measurement and purging functions. The first pressure tapping line 3 and the second pressure tapping line 6 are connected to the differential pressure transmitter 10 through the first three-way valve 9, realizing the transmission of the pressure signals before and after the orifice plate 1 to the differential pressure transmitter 10, enabling it to accurately measure the differential pressure, thus providing a basis for accurate flow calculation. The signal is transmitted to the computing unit and the result is output to the display unit, realizing the acquisition, processing, and intuitive display of flow data, ensuring the acquisition and analysis of flow data during the production process. The connection method of the first insulated and heated steam pipeline 11 provides a steam purging passage for the pressure tapping pipeline at the front end of the orifice plate 1. The fifth valve 12 can control the on / off of steam, and when needed, the insulated and heated steam can be introduced into the first pressure tapping pipeline 3 to purge the pipeline and the front end of the orifice plate 1, effectively removing impurities and ensuring measurement accuracy. In conjunction with the first insulated and heated steam pipeline 11, purging steam is provided to the pressure tapping pipeline at the rear end of the orifice plate 1. The sixth valve 14 controls the steam entry to purge the pressure tapping pipeline at the rear end of the orifice plate 1 and the rear end of the orifice plate 1, further improving the purging effect of the overall device and ensuring the cleanliness of the entire measurement system.

[0022] In a preferred embodiment, a second three-way valve and a third three-way valve are also included. The first insulated and heated steam pipeline 11 is connected to the first pressure tapping pipeline 3 through the second three-way valve, and the second insulated and heated steam pipeline 13 is connected to the second pressure tapping pipeline 6 through the third three-way valve. The setting of the second three-way valve and the third three-way valve increases the flexibility and stability of the connection between the steam pipeline and the pressure tapping pipeline, optimizes the steam introduction path, makes the steam more evenly distributed when entering the pressure tapping pipeline, and improves the purging effect. It can effectively improve the purging efficiency and ensure that all parts can be fully purged.

[0023] In a preferred embodiment, a seventh valve 15 and an eighth valve 16 are also included. The seventh valve 15 is disposed on the first insulated and heated steam pipeline 11, and the eighth valve 16 is disposed on the second insulated and heated steam pipeline 13. The additional seventh valve 15 and eighth valve 16 further enhance the control capability of steam flow and on / off, and can effectively avoid the situation where steam enters the pressure tapping pipe due to the steam valve not being closed tightly during the measurement state, resulting in inaccurate detection values.

[0024] In a preferred embodiment, the steam pressure of the first insulated and heated steam pipeline 11 is 0.3–0.6 MPa, and the temperature is not lower than 150°C. This reasonable steam pressure range ensures that the steam has sufficient power to flow rapidly within the pressure tapping pipeline and effectively flush away impurities. The temperature of not lower than 150°C prevents steam condensation within the pipeline, ensuring the gaseous flowability of the steam. It also softens and decomposes some viscous impurities, further improving the purging effect.

[0025] In a preferred embodiment, the steam pressure of the second insulated and heated steam pipeline 13 is 0.3 to 0.6 MPa, and the temperature is not lower than 150°C. Similar to the first insulated and heated steam pipeline 11, the appropriate steam pressure and temperature can ensure that the second insulated and heated steam pipeline 13 can effectively purge the pressure tapping pipeline at the rear end of the orifice plate 1 and the rear end of the orifice plate 1, maintain the consistency with the purging effect of the front pressure tapping pipeline, and fully ensure the cleanliness and stable operation of the entire measurement system.

[0026] In a preferred embodiment, the first valve 4, the second valve 5, the third valve 7, the fourth valve 8, the fifth valve 12, the sixth valve 14, the seventh valve 15, and the eighth valve 16 are either gate valves or ball valves. Both gate valves and ball valves are common and reliable valve types. Gate valves are characterized by good sealing performance and accurate flow regulation; ball valves, on the other hand, offer advantages such as convenient operation and rapid switching. Selecting these two types of valves can meet the valve performance requirements of the device under different operating scenarios, achieving both strict sealing to prevent leakage and convenient switching operations, maintaining the normal operation of the device and facilitating operation and management.

[0027] The method of using the orifice plate sampling tube back-flushing device for measuring coke oven gas volume provided by this utility model;

[0028] Measurement status operation method

[0029] Close the fifth valve 12 and the seventh valve 15 on the first heat-tracing steam pipeline 11, and the sixth valve 14 and the eighth valve 16 on the second heat-tracing steam pipeline 13;

[0030] Open the first valve 4 and the second valve 5 on the first pressure tapping line 3, and the third valve 7 and the fourth valve 8 on the second pressure tapping line 6;

[0031] The first three-way valve 9 is opened. At this time, coke oven gas flows as a medium through the orifice plate 1, which is coaxially positioned within the coke oven gas pipeline 2. The pressure difference generated before and after the orifice plate 1 is transmitted to the differential pressure transmitter 10 through the first pressure tapping pipeline 3 and the second pressure tapping pipeline 6. The differential pressure transmitter 10 accurately converts and processes the received differential pressure signal and then transmits it to the calculation unit. After the calculation unit calculates the signal according to the preset algorithm, it outputs the final data to the display unit, thereby realizing accurate measurement and intuitive display of the coke oven gas flow rate.

[0032] Purge operation method

[0033] 1. Pressure tapping line at the front end of orifice plate 1 and purging line at the front end of orifice plate 1

[0034] By closing the first valve 4 on the first pressure tapping line 3 and opening the second valve 5, the differential pressure transmitter 10 can be checked for zero point to ensure the accuracy of its working status.

[0035] Open the fifth valve 12 and the seventh valve 15 on the first heat-tracing steam pipeline 11. Under pressure (0.3-0.6MPa) and a temperature not lower than 150℃, the heat-tracing steam flows through the first heat-tracing steam pipeline 11 and evenly into the first pressure tapping pipeline 3 between the first valve 4 and the second valve 5 via the second three-way valve. After passing through the second valve 5, it cleans and purges the impurities accumulated inside the first pressure tapping pipeline 3 and at the front end of the orifice plate 1. This steam pressure ensures that the steam flows rapidly in the pipeline and effectively flushes away impurities, while the temperature prevents steam condensation and softens and decomposes viscous impurities, improving the purging effect.

[0036] After the purging operation is completed, close the fifth valve 12 and the seventh valve 15 on the first heat-tracing steam pipeline 11.

[0037] Pressure tapping line at the rear end of orifice plate 1 and purging line at the rear end of orifice plate 1

[0038] Close the third valve 7 on the second pressure tapping pipeline 6, open the fourth valve 8, and open the sixth valve 14 and the eighth valve 16 on the second heat-tracing steam pipeline 13. Heat-tracing steam flows through the second heat-tracing steam pipeline 13 and evenly into the second pressure tapping pipeline 6 between the third valve 7 and the fourth valve 8 via the third three-way valve. This performs a comprehensive and thorough purging operation on the second pressure tapping pipeline 6 and the rear end of the orifice plate 1, completely removing long-accumulated impurities and other contaminants. The steam pressure (0.3-0.6 MPa) and temperature (not lower than 150℃) of the second heat-tracing steam pipeline 13 are the same as those of the first heat-tracing steam pipeline 11, ensuring consistency between the purging effect in this area and that at the front end.

[0039] After the purging is completed, close the sixth valve 14 and the eighth valve 16 on the second heat-tracing steam pipeline 13.

[0040] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A backflushing device for a sampling tube for measuring coke oven gas volume using an orifice plate, characterized in that: include: An orifice plate, wherein the orifice plate is installed in a coaxial position within a coke oven gas pipeline; A first pressure tapping line, one end of which is connected to and communicates with the coke oven gas pipeline at the front end of the orifice plate and is aligned with the front end of the orifice plate. A first valve and a second valve are provided on the first pressure tapping line. The second pressure tapping line has one end connected to and in communication with the coke oven gas pipeline at the rear end of the orifice plate, and is aligned with the rear end of the orifice plate. The second pressure tapping line is equipped with a third valve and a fourth valve. First three-way valve The differential pressure transmitter has the first pressure tapping line and the second pressure tapping line connected to the differential pressure transmitter at the ends away from the coke oven gas pipeline through the first three-way valve. The differential pressure transmitter is used to measure the differential pressure generated by the medium flowing through the orifice plate, and can transmit the signal to the calculation unit for calculation and output the result to the display unit. The first heat-tracing steam pipeline has one end connected to the heat-tracing steam equipment and the other end connected to the first pressure tapping pipeline between the first valve and the second valve. A fifth valve is provided on the first heat-tracing steam pipeline. as well as The second heat-tracing steam pipeline has one end connected to the heat-tracing steam equipment and the other end connected to the second pressure tapping pipeline between the third valve and the fourth valve. A sixth valve is provided on the second heat-tracing steam pipeline.

2. The orifice plate sampling tube backflushing device for measuring coke oven gas volume according to claim 1, characterized in that: It also includes a second three-way valve and a third three-way valve. The first heat-insulating and heat-tracing steam pipeline is connected to the first pressure tapping pipeline through the second three-way valve, and the second heat-insulating and heat-tracing steam pipeline is connected to the second pressure tapping pipeline through the third three-way valve.

3. The orifice plate sampling tube backflushing device for measuring coke oven gas volume according to claim 2, characterized in that: It also includes a seventh valve and an eighth valve, wherein the seventh valve is installed on the first heat-tracing steam pipeline and the eighth valve is installed on the second heat-tracing steam pipeline.

4. The orifice plate sampling tube backflushing device for measuring coke oven gas volume according to claim 3, characterized in that: The steam pressure of the first heat-tracing steam pipeline is 0.3 to 0.6 MPa, and the temperature is not lower than 150°C.

5. The orifice plate sampling tube backflushing device for measuring coke oven gas volume according to claim 4, characterized in that: The steam pressure of the second heat-tracing steam pipeline is 0.3 to 0.6 MPa, and the temperature is not lower than 150°C.

6. The orifice plate sampling tube backflushing device for measuring coke oven gas volume according to claim 5, characterized in that: The first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, and the eighth valve are shut-off valves or ball valves.

Images