Chimney smoke discharge pressure measuring device

Abstract

The utility model relates to a chimney smoke discharge pressure measuring device which comprises a first elbow, a Venturi sleeve, a second elbow, a gas guide pipe, a gas inlet cylinder and a gas pressure sensor, the Venturi sleeve comprises a contraction pipe, a throat pipe and a diffusion pipe which are horizontally communicated in sequence, and the pipe opening of the contraction pipe is downwards provided with the first elbow; the top of the air inlet cylinder is communicated with the throat pipe through an air guide pipe, an air pressure sensor is arranged in the air inlet cylinder, and a gap is reserved between a probe of the air pressure sensor and the cylinder wall of the air inlet cylinder. The gas pressure sensor has the beneficial effects that the first elbow, the venturi sleeve, the second elbow and the gas guide pipe are arranged, so that flue gas of which the flow speed is reduced after measurement can be guided out from the gas inlet cylinder, the flue gas is prevented from falling back to the cylinder wall of the gas inlet cylinder, the accumulation of smoke dust in the flue gas on the cylinder wall is further avoided, and the measurement accuracy of the gas pressure sensor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of industry, in particular to a chimney exhaust pressure measuring device. Background Art

[0002] By measuring the chimney exhaust pressure in real time, technicians can understand the combustion efficiency of the gas turbine and the flue gas emission of the chimney, so the measurement of the chimney exhaust pressure is very important. The existing chimney exhaust pressure measuring device is an air intake pipe with a downward opening arranged in the chimney and an air pressure sensor arranged in the air intake pipe. After long-term use, a large amount of smoke dust will accumulate in the wall of the air intake pipe. The smoke dust prevents the smoke from entering the air intake pipe, resulting in inaccurate measurement values ​​of the air pressure sensor. Utility Model Content

[0003] The technical problem to be solved by the utility model is to study a chimney exhaust pressure measuring device, in which smoke and dust will not accumulate on the wall of the air inlet tube, and will not affect the measurement of the exhaust pressure by the air pressure sensor.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] A chimney exhaust pressure measuring device comprises a first elbow, a venturi sleeve, a second elbow, an air guide pipe, an air intake cylinder and an air pressure sensor. The venturi sleeve comprises a contraction tube, a throat pipe and a diffuser pipe which are horizontally connected in sequence. The first elbow is provided downward at the pipe opening of the contraction tube, and the second elbow is provided upward at the pipe opening of the diffuser pipe. The top of the air intake cylinder is connected to the throat pipe through the air guide pipe. An air pressure sensor is provided in the air intake cylinder, and a preset gap is provided between the probe of the air pressure sensor and the cylinder wall of the air intake cylinder.

[0006] The beneficial effects of the present invention are as follows: the measuring device is arranged in the chimney, and the flue gas is converged from the lower part of the chimney through the first elbow and the contraction tube, so that the flue gas flow rate increases and the pressure decreases; at the same time, the flue gas to be measured enters the air inlet tube, squeezes the probe of the air pressure sensor, and the air pressure sensor measures the flue gas pressure. After measurement, the flue gas flow rate decreases and the pressure increases, and converges at the top of the air inlet tube; when the high-speed flue gas of the contraction tube passes through the throat pipe, there is a pressure difference between the throat pipe and the top of the air inlet tube, and the flue gas in the air inlet tube is pressed into the throat pipe through the air guide pipe, and together with the flue gas in the throat pipe, it converges from the diffuser pipe and the second elbow again to the chimney and is discharged; the first elbow, the venturi sleeve, the second elbow, and the air guide pipe are arranged, so that the flue gas with reduced flow rate after measurement can be discharged from the air inlet tube, preventing the flue gas from falling back onto the wall of the air inlet tube, thereby avoiding the accumulation of smoke dust in the flue gas on the wall of the tube, and improving the measurement accuracy of the air pressure sensor.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the first elbow, the contraction tube, the throat tube, the diffusion tube, the second elbow and the air guide tube can all be detachably connected.

[0009] Furthermore, the joints between the first elbow, the second elbow and the venturi sleeve are all rounded.

[0010] Furthermore, the inner walls of the first elbow, the contraction tube, the throat, the diffuser, the second elbow, the air guide tube and the air intake cylinder are polished and coated with a wear-resistant and corrosion-resistant coating.

[0011] Furthermore, the top of the air intake cylinder is in a cone shape that approaches the outside of the air guide pipe interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of a chimney exhaust pressure measuring device according to the present invention;

[0013] Figure 2 This is a cross-sectional view of a chimney exhaust pressure measuring device according to the present invention;

[0014] Figure 3 for Figure 2 A magnified view of part A;

[0015] Figure 4 This is a schematic diagram of the use of a chimney exhaust pressure measuring device of the utility model;

[0016] Figure 5 for Figure 4 Magnified view of part A.

[0017] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0018] 1. First elbow; 2. Venturi sleeve; 21. Contraction tube; 22. Throat; 23. Diffuser; 3. Second elbow; 4. Air guide tube; 5. Air intake cylinder; 6. Air pressure sensor; 7. Chimney. DETAILED DESCRIPTION

[0019] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0020] like Figures 1 to 5As shown, embodiment 1 of the utility model is a chimney exhaust pressure measuring device, comprising a first elbow 1, a venturi sleeve 2, a second elbow 3, an air guide pipe 4, an air intake cylinder 5 and an air pressure sensor 6. The venturi sleeve 2 comprises a contraction tube 21, a throat pipe 22 and a diffuser 23 which are horizontally connected in sequence. The first elbow 1 is provided downward at the pipe mouth of the contraction tube 21, and the second elbow 3 is provided upward at the pipe mouth of the diffuser 23. The top of the air intake cylinder 5 is connected to the throat pipe 22 through the air guide pipe 4. An air pressure sensor 6 is provided in the air intake cylinder 5, and a preset gap is provided between the probe of the air pressure sensor 6 and the cylinder wall of the air intake cylinder 5.

[0021] The measuring device is set in the chimney 7. The flue gas passes through the first elbow 1 from the lower part of the chimney 7 and converges through the contraction tube 21, which increases the flue gas flow rate and reduces the pressure. At the same time, the flue gas to be measured enters the air inlet cylinder 5, squeezes the probe of the air pressure sensor 6, and the air pressure sensor 6 measures the flue gas pressure. After measurement, the flue gas flow rate decreases and the pressure increases, and converges at the top of the air inlet cylinder 5. When the high-speed flue gas from the contraction tube 21 passes through the throat pipe 22, there is a pressure difference between the throat pipe 22 and the top of the air inlet cylinder 5. The flue gas in the air cylinder 5 is pressed into the throat pipe 22 through the air duct 4, and together with the flue gas in the throat pipe 22, it is gathered again from the diffuser 23 and the second elbow 3 to the chimney 7 and discharged; the first elbow 1, the venturi sleeve 2, the second elbow 3, and the air duct 4 are arranged so that the flue gas with reduced flow rate after measurement can be discharged from the air intake cylinder 5, preventing the flue gas from falling back onto the wall of the air intake cylinder 5, thereby avoiding the accumulation of smoke dust in the flue gas on the wall of the cylinder, and improving the measurement accuracy of the air pressure sensor 6.

[0022] Example 2 of the present invention is a chimney exhaust pressure measuring device. Based on Example 1, the first elbow 1, contraction tube 21, throat tube 22, diffuser 23, second elbow 3, and air guide tube 4 are all detachably connected. Depending on the exhaust pressure of the chimney 7, different tube diameters can be reasonably selected to obtain an appropriate pressure difference, thereby completely exhausting the smoke in the air inlet 5.

[0023] Embodiment 3 of the present invention is a device for measuring the exhaust pressure of a chimney 7. Based on embodiment 2, the joints between the first elbow 1, the second elbow 3 and the venturi sleeve 2 are all rounded to prevent smoke and dust from accumulating at the joints.

[0024] Example 4 of the present invention provides a chimney exhaust pressure measuring device. Based on Example 3, the inner walls of the first elbow 1, contraction tube 21, throat 22, diffuser 23, second elbow 3, air guide tube 4, and air inlet 5 are polished and coated with a wear-resistant and corrosion-resistant coating. This increases the service life of the device. In practice, the wear-resistant and corrosion-resistant coating is composed of a polymer material, wear-resistant aggregate, ultrafine powder, and an inorganic polymer dispersion. After curing, the coating particles are densely packed, exhibit good adhesion, are not easily detached, and exhibit excellent resistance to thermal denaturation.

[0025] Embodiment 5 of the present invention is a chimney exhaust pressure measuring device. Based on any one of embodiments 1 to 4, the top of the air inlet cylinder 5 is tapered toward the outside of the interface of the air guide pipe 4. This facilitates the convergence of smoke at the top of the air inlet cylinder 5 and improves the efficiency of smoke exhaust.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A chimney exhaust pressure measuring device, characterized in that: The invention comprises a first elbow (1), a venturi sleeve (2), a second elbow (3), an air guide pipe (4), an air inlet cylinder (5) and an air pressure sensor (6); the venturi sleeve (2) comprises a contraction tube (21), a throat pipe (22) and a diffusion pipe (23) which are connected in sequence horizontally; the first elbow (1) is arranged downward at the pipe opening of the contraction tube (21); the second elbow (3) is arranged upward at the pipe opening of the diffusion pipe (23); the top of the air inlet cylinder (5) is connected to the throat pipe (22) through the air guide pipe (4); the air pressure sensor (6) is arranged in the air inlet cylinder (5); and a preset gap is formed between the probe of the air pressure sensor (6) and the cylinder wall of the air inlet cylinder (5).

2. A chimney exhaust pressure measuring device according to claim 1, characterized in that: The first elbow (1), the shrink tube (21), the throat tube (22), the diffuser tube (23), the second elbow (3) and the air guide tube (4) are all detachably connected.

3. The chimney exhaust pressure measuring device according to claim 2, characterized in that: The joints between the first elbow (1), the second elbow (3) and the Venturi sleeve (2) are all rounded.

4. A chimney exhaust pressure measuring device according to claim 3, characterized in that: The inner walls of the first elbow (1), the contraction tube (21), the throat (22), the diffuser (23), the second elbow (3), the air guide tube (4) and the air intake cylinder (5) are polished and coated with a wear-resistant and corrosion-resistant coating.

5. A chimney exhaust pressure measuring device according to any one of claims 1 to 4, characterized in that: The top of the air inlet cylinder (5) is in a conical shape that moves toward the outside of the interface of the air guide pipe (4).

Images