Instrument pressure tapping device

Abstract

The utility model provides an instrument pressure tapping device which comprises a first pressure tapping pipe and a second pressure tapping pipe, the first pressure tapping pipe is arranged on a coal gas main pipeline and arranged upwards, the second pressure tapping pipe is arranged on the upper portion of the first pressure tapping pipe, one end of the second pressure tapping pipe is communicated with the upper portion of the first pressure tapping pipe, and the other end of the second pressure tapping pipe is communicated with the lower portion of the second pressure tapping pipe. The second pressure tapping pipe is used for communicating the first pressure tapping pipe with the pressure tapping instrument, and the circulation cross section area of the first pressure tapping pipe is larger than that of the second pressure tapping pipe. According to the device, coal gas containing a large amount of smoke dust upwards enters the first pressure tapping pipe from the coal gas main pipe, due to the fact that the first pressure tapping pipe is arranged upwards, most of the smoke dust settles under the action of gravity and then returns to the coal gas main pipe, and only a small amount of the smoke dust enters the second pressure tapping pipe and makes contact with the pressure tapping instrument; according to the arrangement mode, the situation that smoke dust is accumulated in the first pressure tapping pipe and the second pressure tapping pipe is greatly reduced, the pipeline pressure detected by the pressure tapping instrument is more accurate, and the fault rate is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of steel smelting, in particular to an instrument pressure taking device. Background Art

[0002] In the existing steel production, it is necessary to monitor various indicators in the steelmaking process, such as the need to monitor the pressure of the pipelines that produce coal gas during steelmaking and ironmaking. The dust and water content in the pipeline gas produced by steelmaking and ironmaking are generally high. For the pressure-taking device of the small pipeline, the air flow temperature gradually decreases as the pipeline extends, and condensed water appears. In this process, dust condenses with a small amount of condensed water, which can easily block the pressure-taking pipeline over the years, and the frequency of blockage is even higher in winter. For some key monitoring signals in the process, maintenance is extremely difficult.

[0003] In summary, there is an urgent need for an instrument pressure taking device to solve or at least partially solve the problems existing in the prior art. Utility Model Content

[0004] The utility model aims to provide an instrument pressure taking device, aiming to solve the problem of inaccurate pressure taking caused by blockage of the pressure taking pipeline. The specific technical solution is as follows:

[0005] An instrument pressure-taking device comprises a first pressure-taking pipe and a second pressure-taking pipe, wherein the first pressure-taking pipe is arranged on a gas main pipeline and the first pressure-taking pipe is arranged upward, the second pressure-taking pipe is arranged on the upper part of the first pressure-taking pipe, one end of the second pressure-taking pipe is connected with the upper part of the first pressure-taking pipe, the second pressure-taking pipe is used to connect the first pressure-taking pipe with a pressure-taking instrument, the pressure-taking instrument is located downstream of the second pressure-taking pipe, and the flow cross-sectional area of ​​the first pressure-taking pipe is greater than the flow cross-sectional area of ​​the second pressure-taking pipe.

[0006] Furthermore, the first pressure-taking pipe includes an air-guiding part and a dust-reduction part, the flow cross-sectional area of ​​the dust-reduction part is larger than the flow cross-sectional area of ​​the air-guiding part, and the flow cross-sectional area of ​​the air-guiding part is larger than the flow cross-sectional area of ​​the second pressure-taking pipe, the dust-reduction part is located at the upper part of the air-guiding part, and the air-guiding part is connected to the interior of the dust-reduction part, one end of the air-guiding part is connected to the gas main pipeline, the second pressure-taking pipe is connected to the upper part of the dust-reduction part, and the second pressure-taking pipe is connected to the dust-reduction part.

[0007] Furthermore, a transition cone is provided between the dust reduction portion and the air guide portion, and a large opening of the transition cone faces the dust reduction portion, and a small opening of the transition cone faces the air guide portion.

[0008] Furthermore, a first sewage valve is provided on the dust reduction part.

[0009] Furthermore, the first sewage discharge valve is arranged at the top of the dust suppression part, and the valve port of the first sewage discharge valve is arranged opposite to the transition cone.

[0010] Furthermore, a second drain valve is provided on the second pressure-taking pipe, the second drain valve is arranged at a downstream end away from the first pressure-taking pipe, and the pressure instrument is installed between the first pressure-taking pipe and the second drain valve.

[0011] Furthermore, a check valve is provided on the second pressure-taking pipe, and the check valve is arranged between the first pressure-taking pipe and the pressure-taking instrument.

[0012] Furthermore, a recoil valve is provided on the second pressure taking pipe, and the recoil valve is provided between the pressure taking instrument and the second sewage valve.

[0013] Furthermore, the recoil valve is a solenoid valve.

[0014] Furthermore, a support frame is provided on the main gas pipeline, and the support frame is used to support the pressure instrument on the main gas pipeline.

[0015] The application of the technical solution of the utility model has the following beneficial effects: coal gas containing a large amount of smoke and dust enters the first pressure-taking pipe upward from the coal gas main pipeline. Because the first pressure-taking pipe is arranged upward, most of the smoke and dust settle under the action of gravity and return to the coal gas main pipeline, and only a very small amount of smoke and dust enters the second pressure-taking pipe and contacts the pressure-taking instrument. This arrangement greatly reduces the accumulation of smoke and dust in the first pressure-taking pipe and the second pressure-taking pipe, making the pipeline pressure detected by the pressure-taking instrument more accurate, and reducing the number of inaccurate pressure-taking failures caused by blockage of the pressure-taking pipe.

[0016] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 The utility model is a schematic diagram of the overall structure of an instrument pressure taking device.

[0019] Among them, 1. the first pressure-taking pipe; 11. the air guide part; 12. the dust-reducing part; 13. the transition cone; 2. the second pressure-taking pipe; 3. the main gas pipeline; 4. the pressure-taking instrument; 5. the first sewage valve; 6. the second sewage valve; 7. the inspection valve; 8. the recoil valve; 9. the support frame. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below, and preferred embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0022] Example:

[0023] See also Figure 1 This embodiment provides an instrument pressure device, including a first pressure tube 1 and a second pressure tube 2. The first pressure tube 1 is arranged on the main gas pipeline 3, and the first pressure tube 1 is arranged upward, the second pressure tube 2 is arranged on the upper part of the first pressure tube 1, one end of the second pressure tube 2 is connected with the upper part of the first pressure tube 1, the second pressure tube 2 is used to connect the first pressure tube 1 with a pressure instrument 4, the pressure instrument 4 is located downstream of the second pressure tube 2, and the flow cross-sectional area of ​​the first pressure tube 1 is greater than the flow cross-sectional area of ​​the second pressure tube 2. In specific implementation, the instrument pressure device is generally arranged in the horizontal section of the main gas pipeline 3, the first pressure tube 1 is arranged vertically upward above the main gas pipeline 3, the second pressure tube 2 is fixed on the side of the top of the first pressure tube 1, the end of the second pressure tube 2 connected to the first pressure tube 1 is the upstream end, the end of the second pressure tube 2 away from the first pressure tube 1 is the downstream end, and the upstream end of the second pressure tube 2 is arranged slightly lower than the downstream end of the second pressure tube 2.

[0024] It can be understood that first, the coal gas containing a large amount of smoke flows along the gas main pipeline 3 and enters the first pressure taking pipe 1. Because the gas main pipeline 3 is in a horizontal state and the first pressure taking pipe 1 is in a vertical state, the horizontal flow rate of the coal gas containing smoke flowing into the first pressure taking pipe 1 quickly becomes zero, and the flow rate of the coal gas containing smoke entering the first pressure taking pipe 1 slows down. A large amount of smoke in the coal gas falls back into the gas main pipeline 3 under the action of gravity, and only a very small amount of smoke will enter the second pressure taking pipe 2 from the top of the first pressure taking pipe 1. This structure effectively prevents smoke from accumulating in the first pressure taking pipe 1 and the second pressure taking pipe 2, prevents the first pressure taking pipe 1 and the second pressure taking pipe 2 from being blocked, and maintains the accuracy of the pressure monitored by the pressure taking instrument 4.

[0025] Furthermore, the first pressure-taking pipe 1 includes an air-guiding portion 11 and a dust-reduction portion 12, the flow cross-sectional area of ​​the dust-reduction portion 12 is greater than the flow cross-sectional area of ​​the air-guiding portion 11, and the flow cross-sectional area of ​​the air-guiding portion 11 is greater than the flow cross-sectional area of ​​the second pressure-taking pipe 2, the internal space of the air-guiding portion 11 is a cylinder, the internal space of the dust-reduction portion 12 is also a cylinder, the diameter of the cylinder of the internal space of the dust-reduction portion 12 is greater than the diameter of the cylinder of the internal space of the air-guiding portion 11, specifically, the ratio of the diameter of the air-guiding portion 11 to the diameter of the dust-reduction portion 12 is between 2 and 2.5, the dust-reduction portion 12 is located at the upper part of the air-guiding portion 11, and the air-guiding portion 11 is connected to the inside of the dust-reduction portion 12, one end of the air-guiding portion 11 is connected to the main gas pipeline 3, the second pressure-taking pipe 2 is connected to the upper part of the dust-reduction portion 12, and the second pressure-taking pipe 2 is connected to the dust-reduction portion 12. Therefore, when the coal gas containing a large amount of smoke and dust enters the gas guide section 11 from the gas main pipeline 3 and then enters the dust reduction section 12 from the gas guide section 11, because the flow cross-sectional area of ​​the gas guide section 11 is smaller than the flow cross-sectional area of ​​the dust reduction section 12, the speed of the air flow slows down after flowing from the gas guide section 11 to the dust reduction section 12, so that the smoke and dust in the coal gas can be better settled. The smoke and dust in the coal gas directly falls back into the gas main pipeline 3 when settling, and will not accumulate in the dust reduction section 12 or the gas guide section 11, thereby effectively preventing the dust reduction section 12 and the gas guide section 11 from being blocked.

[0026] Furthermore, a transition cone 13 is provided between the dust removal section 12 and the air guide section 11, and the large opening of the transition cone 13 faces the dust removal section 12, and the small opening of the transition cone 13 faces the air guide section 11. Because the flow cross-sectional area of ​​the dust removal section 12 is larger than the flow cross-sectional area of ​​the air guide section 11, a part of the smoke and dust in the dust removal section 12 cannot directly fall into the air guide section 11, and the settlement of this part of the smoke and dust is guided by the transition cone 13, so that the smoke and dust settled on the transition cone 13 can be smoothly returned to the main gas pipeline 3 under the guidance of the transition cone 13, thereby preventing this part of the smoke and dust from accumulating in the dust removal section 12.

[0027] Furthermore, the dust removal section 12 is provided with a first drain valve 5, which is arranged at the top of the dust removal section 12, and the valve port of the first drain valve 5 is arranged opposite to the transition cone 13. The smoke and dust in the dust removal section 12 or the air guide section 11 can be discharged through the first drain valve 5. When smoke and dust accumulate in the dust removal section 12 or the air guide section 11, the first drain valve 5 can be opened, and a cleaning tool can be used to extend from the first drain valve 5 into the dust removal section 12 or the air guide section 11 for cleaning, so as to facilitate cleaning of the dust removal section 12 or the air guide section 11.

[0028] Furthermore, a second drain valve 6 is provided on the second pressure-taking pipe 2, and the second drain valve 6 is provided at the downstream end away from the first pressure-taking pipe 1, and the pressure meter 4 is installed between the first pressure-taking pipe 1 and the second drain valve 6. When the second pressure-taking pipe 2 is clogged, the second drain valve 6 is opened, and the clog is flushed out of the drain valve by using gas pressure, or a cleaning tool is used to extend from the second drain valve 6 into the second pressure-taking pipe 2 to clean the inside of the second pressure-taking pipe 2.

[0029] Furthermore, a check valve 7 is provided on the second pressure-taking pipe 2, and the check valve 7 is provided between the first pressure-taking pipe 1 and the pressure instrument 4. When the pressure instrument 4 is damaged or needs to be replaced, the check valve 7 is closed to prevent the gas and smoke in the gas main pipeline 3 from flowing out from the second pressure-taking pipe 2, so as to facilitate the check and maintenance of the pressure instrument 4.

[0030] Furthermore, a recoil valve 8 is provided on the second pressure-taking pipe 2, and the recoil valve 8 is provided between the pressure-taking instrument 4 and the second blowdown valve 6. The end of the recoil valve 8 away from the second pressure-taking pipe 2 is connected to the nitrogen pipe, and the pressure in the nitrogen pipe is greater than the pressure in the main gas pipe 3. When it is necessary to clean the second pressure-taking pipe 2, the recoil valve 8 can be opened to allow nitrogen to enter the second pressure-taking pipe 2, and the smoke and dust accumulated in the second pressure-taking pipe 2 can be blown to the dust removal part 12 in the first pressure-taking pipe 1, and settled back to the main gas pipe 3. It is prevented that the settled smoke and dust block the second pressure-taking pipe 2 and cause the pressure monitored by the pressure-taking instrument 4 to be inaccurate. The recoil valve 8 is a solenoid valve, which can be remotely controlled through networking. When the process conditions are met, nitrogen back-blowing and dust cleaning can be carried out as needed. The solenoid valve can be cleaned regularly through computer settings, which reduces the labor intensity of manual labor. In this embodiment, the recoil valve 8 is a nitrogen pulse backflush valve, and the nitrogen pulse backflush valve is externally connected to a nitrogen delivery pipe. The gas pressure of the external nitrogen delivery pipe is generally around 0.4 MPa. The nitrogen pulse backflush valve is used to control the generation of nitrogen flow pulses, thereby blowing the smoke in the second pressure taking pipe 2 out from the first pressure taking pipe 1 in the opposite direction for cleaning.

[0031] Furthermore, a support frame 9 is provided on the gas main pipeline 3, and the support frame 9 is used to support the pressure instrument 4 on the gas main pipeline 3. The pressure instrument 4, the second sewage valve 6, the recoil valve 8, etc. are all cantilevered and supported by the second pressure taking pipe 2, and the second pressure taking pipe 2 is relatively small. By using the support frame 9 to support the pressure instrument 4 on the gas main pipeline 3, the stability of the pressure instrument 4 is improved, and the second pressure taking pipe 2 is prevented from being bent or broken due to excessive load.

[0032] The technical scheme of the utility model is applied, and the working principle is as follows: when the equipment is operating normally, the coal gas containing a large amount of smoke and dust is transported from the upstream to the downstream of the coal gas main pipeline 3, the coal gas containing smoke and dust enters the dust reduction section 12 from the air guide section 11 of the first pressure taking pipe 1 and enters the second pressure taking pipe 2 from the top of the dust reduction section 12 until it reaches the pressure taking instrument 4, the coal gas containing smoke and dust enters the air guide section 11 and the dust reduction section 12 of the first pressure taking pipe 1 from the coal gas main pipeline 3, because the air guide section 11 and the dust reduction section 12 are arranged vertically, the smoke and dust in the coal gas settles downward under the action of gravity, and the smoke and dust that settles downward returns to the coal gas main pipeline 3 to prevent the settled smoke and dust from clogging the dust reduction section 12 and the gas guide section 11, because the flow cross-sectional area of ​​the dust reduction section 12 is larger than the flow cross-sectional area of ​​the gas guide section 11, the flow rate of the coal gas containing smoke and dust slows down after entering the dust reduction section 12 from the gas guide section 11, which is beneficial to the settlement of smoke and dust in the coal gas. When it is necessary to clean the first pressure-taking pipe 1, the first drain valve 5 is opened to discharge the smoke from the first drain port; when it is necessary to clean the second pressure-taking pipe 2, the second drain valve 6 can be opened to discharge the smoke in the second drain pipe from the second drain valve 6, or the recoil valve 8 can be opened to blow the smoke in the second drain pipe back from the second drain pipe and drop it from the first drain pipe into the gas main pipeline 3, thereby cleaning the second pressure-taking pipe 2 and the first pressure-taking pipe 1; when it is necessary to inspect and repair the pressure-taking instrument 4, the inspection port can be closed to disassemble the pressure-taking instrument 4 for inspection and repair, thereby facilitating maintenance of the inspection instrument.

[0033] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An instrument pressure taking device, characterized in that: The invention comprises a first pressure-taking pipe (1) and a second pressure-taking pipe (2), wherein the first pressure-taking pipe (1) is arranged on a main gas pipeline (3) and the first pressure-taking pipe (1) is arranged upward, the second pressure-taking pipe (2) is arranged on the upper part of the first pressure-taking pipe (1), one end of the second pressure-taking pipe (2) is connected to the upper part of the first pressure-taking pipe (1), the second pressure-taking pipe (2) is used to connect the first pressure-taking pipe (1) with a pressure instrument (4), the pressure instrument (4) is located downstream of the second pressure-taking pipe (2), and the flow cross-sectional area of ​​the first pressure-taking pipe (1) is greater than the flow cross-sectional area of ​​the second pressure-taking pipe (2).

2. The instrument pressure taking device according to claim 1, characterized in that: The first pressure-taking pipe (1) comprises an air-guiding portion (11) and a dust-removing portion (12); the flow cross-sectional area of ​​the dust-removing portion (12) is larger than the flow cross-sectional area of ​​the air-guiding portion (11), and the flow cross-sectional area of ​​the air-guiding portion (11) is larger than the flow cross-sectional area of ​​the second pressure-taking pipe (2); the dust-removing portion (12) is located at the upper part of the air-guiding portion (11), and the air-guiding portion (11) is connected to the inside of the dust-removing portion (12); one end of the air-guiding portion (11) is connected to a main gas pipeline (3); the second pressure-taking pipe (2) is connected to the upper part of the dust-removing portion (12), and the second pressure-taking pipe (2) is connected to the dust-removing portion (12).

3. The instrument pressure taking device according to claim 1, characterized in that: A transition cone (13) is provided between the dust removal section (12) and the air guide section (11), and a large opening of the transition cone (13) faces the dust removal section (12), while a small opening of the transition cone (13) faces the air guide section (11).

4. An instrument pressure taking device according to claim 2 or 3, characterized in that: The dust removal part (12) is provided with a first sewage discharge valve (5).

5. The instrument pressure taking device according to claim 4, characterized in that: The first sewage discharge valve (5) is arranged at the top of the dust removal section (12), and the valve opening of the first sewage discharge valve (5) is arranged opposite to the transition cone (13).

6. An instrument pressure taking device according to any one of claims 1 to 3, characterized in that: The second pressure-taking pipe (2) is provided with a second drain valve (6), the second drain valve (6) being arranged at a downstream end away from the first pressure-taking pipe (1), and the pressure-taking instrument (4) being installed between the first pressure-taking pipe (1) and the second drain valve (6).

7. An instrument pressure taking device according to any one of claims 1 to 3, characterized in that: The second pressure-taking pipe (2) is provided with a check valve (7), and the check valve (7) is arranged between the first pressure-taking pipe (1) and the pressure-taking instrument (4).

8. The instrument pressure taking device according to claim 6, characterized in that: The second pressure-taking pipe (2) is provided with a backflush valve (8), and the backflush valve (8) is arranged between the pressure-taking instrument (4) and the second sewage valve (6).

9. The instrument pressure taking device according to claim 8, characterized in that: The recoil valve (8) is a solenoid valve.

10. An instrument pressure taking device according to any one of claims 1 to 3, characterized in that: A support frame (9) is arranged on the main gas pipeline (3), and the support frame (9) is used to support a pressure instrument (4) on the main gas pipeline (3).

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