Measuring instrument for positive pressure flue gas with high dust content

Abstract

The utility model relates to the field of instrument measuring devices, and discloses a measuring instrument for positive pressure flue gas with high dust content, which comprises a flue gas pipe, the side wall of the flue gas pipe is fixedly connected with a breather pipe, the top of a gas inlet pipe is fixedly connected with an anti-blocking device, the top of the anti-blocking device is fixedly connected with a sampling pipe, and the sampling pipe is fixedly connected with a gas outlet pipe. A pressure guide pipe is fixedly connected to the top of the sampling pipe, a three-way valve is arranged at the position, away from the stop valve, of the pressure guide pipe, a pressure guide pipe electromagnetic valve is fixedly connected to the top of the three-way valve, a pressure measuring instrument is arranged at the top of the pressure guide pipe electromagnetic valve, and a purging pipe electromagnetic valve is arranged at the left end of the three-way valve; and a screen is fixedly connected to the interior of the air inlet pipe. According to the utility model, through the mutual cooperation of the smoke pipe, the breather pipe, the anti-blocking device and other structures, the measurement precision is ensured, the maintenance intensity is reduced, and through the mutual cooperation of the screen, the clamping box, the spring and other structures, the preliminary filtration of smoke and the rapid replacement of the screen are realized.

Description

Technical Field

[0001] The utility model relates to the field of instrument measuring devices, in particular to a measuring instrument for positive pressure flue gas with high dust content. Background Art

[0002] At present, there is an inaccurate measurement problem in the pressure measurement of positive pressure flue gas with high dust content, especially for some pressure parameters that occupy an important position in the entire process control or the pressure measurement points that are inconvenient to maintain due to limited space. Although the pressure pipeline is purged regularly, the compressed air will have a large error effect on the measurement during the purging process, so it will affect the operator's judgment on whether the whole system is operating normally, which will cause production accidents or even safety accidents over time. Therefore, this measurement method is specially developed to ensure the accuracy of on-site measurement and greatly reduce the maintenance workload on site. Utility Model Content

[0003] In order to make up for the above shortcomings, the utility model provides a measuring instrument for positive pressure flue gas with high dust content, aiming to improve the problem of low pressure measurement accuracy of positive pressure flue gas with high dust content.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a measuring instrument for positive pressure flue gas with high dust content, comprising a flue pipe, a ventilation pipe is fixedly connected to the side wall of the flue pipe, a flange is fixedly connected to the outer side of the end of the ventilation pipe, the two flanges are threadedly connected by bolts, an air intake pipe is fixedly connected to the inside of the top flange, an anti-blocking device is fixedly connected to the top of the air intake pipe, a sampling tube is fixedly connected to the top of the anti-blocking device, a pressure-leading pipe is fixedly connected to the top of the sampling tube, a stop valve is fixedly connected to the outer side of the pressure-leading pipe, a three-way valve is arranged at a position of the pressure-leading pipe away from the stop valve, a pressure-leading pipe solenoid valve is fixedly connected to the top of the three-way valve, a pressure measuring instrument is arranged on the top of the pressure-leading pipe solenoid valve, a purge pipe solenoid valve is arranged on the left end of the three-way valve, a screen is fixedly connected to the inside of the air intake pipe, a fixing component is arranged on the outer side of the air intake pipe, and the fixing component is used to fix the screen.

[0005] As a further description of the above technical solution:

[0006] The fixing assembly comprises a card box, the outer side of which is fixedly connected to the outer wall of the air intake pipe, a latch is arranged inside the card box, a spring is sleeved on the outer side of the latch, and the outer side of the spring is fixedly connected to a limiting plate.

[0007] As a further description of the above technical solution:

[0008] The stop valve is a DN10 stop valve.

[0009] As a further description of the above technical solution:

[0010] The outer side of the ventilation pipe is fixed to the opening of the smoke pipe by welding.

[0011] As a further description of the above technical solution:

[0012] The air inlet at the left end of the purge pipe solenoid valve is connected to compressed air, and both the purge pipe solenoid valve and the pressure-inducing pipe solenoid valve are remotely controlled by a DCS system program.

[0013] As a further description of the above technical solution:

[0014] The outer side of the limiting plate is slidably connected to the inside of the card box.

[0015] As a further description of the above technical solution:

[0016] One end of the spring is fixedly connected to the right side of the limiting plate, and the other end of the spring is fixedly connected to the inner wall of the card box.

[0017] As a further description of the above technical solution:

[0018] The latch is slidably connected to the interior of the card box, and the outer side of the latch penetrates the side wall of the air inlet pipe and is slidably connected to the interior of the screen.

[0019] The utility model has the following beneficial effects:

[0020] 1. In the utility model, the smoke pipe, the ventilation pipe and the anti-blocking device cooperate with each other, and the smoke is initially filtered through the screen and the anti-blocking device. After the DCS system finishes measuring the pressure data, the purge pipe solenoid valve is started to inject compressed air to flush out the solid particles in the pressure pipe, which ensures the measurement accuracy and reduces the maintenance intensity.

[0021] 2. In the utility model, with the cooperation of structures such as the screen, the card box and the spring, the screen is fixed inside the air intake pipe to achieve preliminary filtration of large particles in the smoke. After working for a long time, the old screen can be removed and replaced with a new one by pulling the latch and unscrewing the bolts on the two flanges, thereby achieving preliminary filtration of the smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional schematic diagram of a measuring instrument for positive pressure flue gas with high dust content proposed by the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of an anti-blocking device for a measuring instrument for positive pressure flue gas with high dust content proposed by the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of a flange of a measuring instrument for positive pressure flue gas with high dust content proposed by the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of a three-way valve of a measuring instrument for positive pressure flue gas with high dust content proposed by the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of a screen of a measuring instrument for positive pressure flue gas with high dust content proposed by the utility model;

[0027] Figure 6 The utility model discloses a schematic diagram of the structure of a latch of a measuring instrument for positive pressure flue gas with high dust content.

[0028] Legend:

[0029] 1. Flue gas pipe; 2. Ventilation pipe; 3. Flange; 4. Anti-blocking device; 5. Sampling tube; 6. Pressure pipe; 7. Stop valve; 8. Bolt; 9. Inlet pipe; 10. Screen; 11. Three-way valve; 12. Purge pipe solenoid valve; 13. Pressure pipe solenoid valve; 14. Pressure measuring instrument; 15. Card box; 16. Spring; 17. Limit plate; 18. Latch. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Reference Figure 1 - Figure 4The utility model provides an embodiment: a measuring instrument for positive pressure flue gas with high dust content, comprising a flue pipe 1, a ventilation pipe 2 is fixedly connected to the side wall of the flue pipe 1, a flange 3 is fixedly connected to the outer side of the end of the ventilation pipe 2, the two flanges 3 are threadedly connected by bolts 8, an air inlet pipe 9 is fixedly connected to the inside of the top flange 3, an anti-blocking device 4 is fixedly connected to the top of the air inlet pipe 9, a sampling tube 5 is fixedly connected to the top of the anti-blocking device 4, a pressure-leading pipe 6 is fixedly connected to the top of the sampling tube 5, a stop valve 7 is fixedly connected to the outer side of the pressure-leading pipe 6, and a three-way valve 11 is arranged at a position of the pressure-leading pipe 6 away from the stop valve 7, A pressure-leading pipe solenoid valve 13 is fixedly connected to the top of the three-way valve 11, and a pressure measuring instrument 14 is arranged on the top of the pressure-leading pipe solenoid valve 13. A purge pipe solenoid valve 12 is arranged on the left end of the three-way valve 11. A screen 10 is fixedly connected to the inside of the air intake pipe 9, and a fixing component is arranged on the outside of the air intake pipe 9, and the fixing component is used to fix the screen 10. The stop valve 7 is a DN10 stop valve 7. The outside of the ventilation pipe 2 is fixed to the opening of the flue gas pipe 1 by welding. The air inlet at the left end of the purge pipe solenoid valve 12 is connected to compressed air. Both the purge pipe solenoid valve 12 and the pressure-leading pipe 6 solenoid valve are remotely controlled by the DCS system.

[0032] Specifically, in the present embodiment, the flue gas is introduced into the ventilation pipe 2 by opening a hole in the side wall of the flue gas pipe 1, the ventilation pipe 2 is fixedly connected to the air inlet pipe 9 by means of a flange 3 and bolts 8, and a screen 10 is fixed inside the air inlet pipe 9 to perform preliminary filtration on the flue gas, and then the flue gas is more finely filtered through the anti-blocking device 4, and finally the flue gas is diverted into the pressure pipe 6 through the sampling tube 5, and then passes through the pressure pipe 6 when the stop valve 7 is opened, and then under the remote program control of the DCS system, the pressure pipe solenoid valve 13 is opened and the pressure of the flue gas is measured by the pressure measuring instrument 14, and after the measurement is completed, the pressure pipe solenoid valve 13 is closed, and then the purge pipe solenoid valve 12 is opened and compressed air is injected into the pressure pipe 6 to blow out the residue of the flue gas in the pressure pipe 6, so as not to cause damage to the equipment.

[0033] Reference Figure 5 - Figure 6 The fixed component includes a card box 15, the outer side of the card box 15 is fixedly connected to the outer wall of the air inlet pipe 9, a latch 18 is arranged inside the card box 15, a spring 16 is sleeved on the outer side of the latch 18, the outer side of the spring 16 is fixedly connected to a limiting plate 17, the outer side of the limiting plate 17 is slidably connected to the inside of the card box 15, one end of the spring 16 is fixedly connected to the right side of the limiting plate 17, the other end of the spring 16 is fixedly connected to the inner wall of the card box 15, the latch 18 is slidably connected to the inside of the card box 15, the outer side of the latch 18 passes through the side wall of the air inlet pipe 9 and is slidably connected to the inside of the screen 10.

[0034] Specifically, a card box 15 is fixed on the side wall of the intake pipe 9. A hole with the same diameter as the plug 18 is opened on the side wall of the intake pipe 9, so that the outer side of the plug 18 can easily penetrate the intake pipe 9, and a hole is also opened inside the screen 10 to facilitate the insertion and fixation of the plug 18. When the screen 10 needs to be replaced, it is only necessary to pull the plug 18, and the limit plate 17 will move accordingly and compress the spring 16. At this time, the bolts 8 on the flange 3 can be removed to separate the intake pipe 9 and the ventilation pipe 2, and the screen 10 can be removed and replaced with a new one. Then the plug 18 is loosened, and under the action of the spring 16, the plug 18 penetrates the intake pipe 9 and is inserted into the screen 10.

[0035] Working principle: The flue gas in the flue pipe 1 is led out through the vent pipe 2 to facilitate pressure measurement. The vent pipe 2 and the air inlet pipe 9 are fixed by a flange 3, and a screen 10 is set inside the air inlet pipe 9 for preliminary filtering of the flue gas. Considering that the flue gas moves in the pressure pipe 6 for a long time, it will cause the pressure pipe 6 to be blocked. For this reason, an anti-blocking device 4 is set on the top of the air inlet pipe 9 to effectively prevent the flue gas from blocking the pressure pipe 6. Finally, the flue gas enters the pressure pipe 6 after passing through the sampling tube 5 and the stop valve 7. In the DCS system Under the remote control of the system, the pressure pipe solenoid valve 13 is opened, the flue gas is detected by the pressure measuring instrument 14 and the data is recorded, then the pressure pipe solenoid valve 13 is closed and the pressure measuring instrument 14 is opened, and the pressure measuring instrument 14 is connected to the compressed air to clean the inside of the pressure pipe 6 to prevent the flue gas residue from clogging the pressure pipe 6; by fixing the card box 15 on the outer wall of the intake pipe 9, under the action of the latch 18 and the spring 16, the latch 18 can be stuck in the screen 10 to complete the fixation, and when the screen 10 needs to be replaced, just pull the latch 18.

[0036] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A measuring instrument for positive pressure flue gas with high dust content, comprising a flue gas pipe (1), characterized in that: The side wall of the flue gas pipe (1) is fixedly connected to a ventilation pipe (2), the outer side of the end of the ventilation pipe (2) is fixedly connected to a flange (3), the two flanges (3) are threadedly connected via bolts (8), the inside of the top flange (3) is fixedly connected to an air intake pipe (9), the top of the air intake pipe (9) is fixedly connected to an anti-blocking device (4), the top of the anti-blocking device (4) is fixedly connected to a sampling tube (5), the top of the sampling tube (5) is fixedly connected to a pressure guide tube (6), and the outer side of the pressure guide tube (6) is fixedly connected to a cut-off A stop valve (7), a three-way valve (11) is arranged at a position of the pressure-guiding pipe (6) away from the stop valve (7), a pressure-guiding pipe solenoid valve (13) is fixedly connected to the top of the three-way valve (11), a pressure measuring instrument (14) is arranged on the top of the pressure-guiding pipe solenoid valve (13), a purge pipe solenoid valve (12) is arranged at the left end of the three-way valve (11), a screen (10) is fixedly connected to the inside of the air intake pipe (9), a fixing component is arranged on the outside of the air intake pipe (9), and the fixing component is used to fix the screen (10).

2. The instrument for measuring positive pressure flue gas with high dust content according to claim 1, characterized in that: The fixing assembly comprises a card box (15), the outer side of the card box (15) being fixedly connected to the outer wall of the air intake pipe (9), a latch (18) being arranged inside the card box (15), a spring (16) being sleeved on the outer side of the latch (18), and a limit plate (17) being fixedly connected to the outer side of the spring (16).

3. The instrument for measuring positive pressure flue gas with high dust content according to claim 1, characterized in that: The stop valve (7) is a DN10 stop valve.

4. The instrument for measuring positive pressure flue gas with high dust content according to claim 1, characterized in that: The outer side of the ventilation pipe (2) is fixed to the opening of the smoke pipe (1) by welding.

5. The instrument for measuring positive pressure flue gas with high dust content according to claim 1, characterized in that: The air inlet at the left end of the purge pipe solenoid valve (12) is connected to compressed air, and both the purge pipe solenoid valve (12) and the pressure-inducing pipe solenoid valve (13) are remotely controlled by a DCS system program.

6. The instrument for measuring positive pressure flue gas with high dust content according to claim 2, characterized in that: The outer side of the limiting plate (17) is slidably connected to the inside of the card box (15).

7. The instrument for measuring positive pressure flue gas with high dust content according to claim 2, characterized in that: One end of the spring (16) is fixedly connected to the right side of the limiting plate (17), and the other end of the spring (16) is fixedly connected to the inner wall of the card box (15).

8. The instrument for measuring positive pressure flue gas with high dust content according to claim 2, characterized in that: The latch (18) is slidably connected to the interior of the card box (15); the outer side of the latch (18) penetrates the side wall of the air inlet pipe (9) and is slidably connected to the interior of the screen (10).

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