A differential pressure density measurement device

Abstract

The utility model relates to density measurement field discloses a kind of differential pressure density measurement devices, including horizontal access unit, the horizontal access unit includes horizontal pipe and diaphragm valve being adaptedly installed in the inside of the horizontal pipe;The inside of the horizontal pipe is provided with first electric valve;Vertical measurement unit, the vertical measurement unit includes the vertical pipe being fixedly connected in the one end of the horizontal pipe, the first differential pressure sampling point being arranged in the inside of the vertical pipe, and the second differential pressure sampling point being arranged in the inside of the vertical pipe;The output end of the first differential pressure sampling point and the second differential pressure sampling point is connected with double-flange differential pressure transmitter;Slurry enters horizontal pipe from desulfurization absorption tower, and horizontal pipe is connected after extension with vertical pipe, and vertical pipe is designed to reduce flow rate with diameter expansion, and stable flow direction, avoid turbulence, ensure that first differential pressure sampling point and second differential pressure sampling point can effectively detect.

Description

Technical Field

[0001] This utility model relates to the field of density measurement, and in particular to a differential pressure density measuring device. Background Technology

[0002] Measurement of gypsum slurry density in boiler flue gas desulfurization systems is an essential parameter related to desulfurization efficiency, circulating slurry volume adjustment, gypsum purity, and crystallization quality.

[0003] Currently, the main methods for measuring the density of gypsum slurry in power plants include the Coriolis method, microwave method, and differential pressure method.

[0004] The Coriolis method uses mass flow meters for measurement and was widely used in the early stages of desulfurization construction in domestic power plants. However, it was gradually phased out by power plants because the measuring tubes are prone to wear and the replacement cost is high (about 80,000 yuan per unit).

[0005] The microwave method uses a dual-electrode system (transmitter and receiver) inserted into a pipe. The change in the microwave number at the receiving electrode is positively correlated with the fluid density. In recent years, the microwave method has been applied to the density measurement of gypsum slurry in power plants. Its advantages include high measurement accuracy (1%), fast response, and wear and corrosion resistance. The disadvantage is the high cost of the equipment; currently, all equipment is imported, costing approximately 150,000 RMB per unit.

[0006] In recent years, due to cost control measures in power plants, the differential pressure method for measuring the density of gypsum slurry has become increasingly common. Its measurement principle is ΔP = ρ. 密 *g*H represents the differential pressure ΔP obtained when the fluid flows through a differential pressure measuring instrument with a fixed height difference H, from which the fluid density is calculated. g is the gravitational constant here.

[0007] Instruction manual attached Figure 2 This is a schematic diagram of an existing differential pressure density measuring device for gypsum slurry.

[0008] The gypsum slurry flows from the bottom of the absorption tower through the gravity outlet (k1) via the horizontal section (①) and upwards into the vertical measurement section (③). In the vertical section, it flows past differential pressure sampling points (b) and (a) to obtain ΔP. The measuring instrument is a dual-flange differential pressure transmitter DP (capillary tube at end a, direct connection at end b). With a fixed elevation difference H = 1.5 meters between a and b, the DCS can obtain ρ by measuring ΔP. 密 After passing through the vertical section, the gypsum slurry is discharged into the tower area pit through the external discharge section (④). The device is equipped with a flushing unit (②) which can realize remote automatic switching of the device's flushing (by switching electric valves M1 and M2).

[0009] A common problem with this type of differential pressure density measuring device in actual operation is that the density ρ is within the design value of 1113±50 kg / m³. 3 Fluctuations exceeding 1113±25 kg / m 3 The scope of actual operation and acceptance. Utility Model Content

[0010] Therefore, the technical problem to be solved by this utility model is that the current technology of differential pressure density measurement exceeds the range of actual operation and results in inaccurate measurement data.

[0011] The above-mentioned technical problems are solved by the following technical solution: This utility model proposes a differential pressure density measuring device, which includes,

[0012] A horizontal access unit, comprising a horizontal pipe and a diaphragm valve adapted to be installed inside the horizontal pipe; a first electric valve is provided inside the horizontal pipe;

[0013] A vertical measurement unit includes a vertical pipe fixedly connected to one end of a horizontal pipe, a first differential pressure sampling point disposed inside the vertical pipe, and a second differential pressure sampling point disposed inside the vertical pipe; the output ends of the first differential pressure sampling point and the second differential pressure sampling point are connected to a dual-flange differential pressure transmitter.

[0014] The external discharge unit includes an external discharge pipe fixedly connected to the end of the vertical pipe away from the horizontal pipe, and an atmospheric vent pipe disposed outside the external discharge pipe. When the slurry enters the interior of the horizontal pipe from the desulfurization absorption tower, it gradually flows into the interior of the vertical pipe and finally discharges into the grounding pit through the external discharge pipe. By adjusting the opening of the diaphragm valve, the slurry in the horizontal section at the top of the external discharge pipe is prevented from overflowing into the atmospheric vent pipe, thereby reducing the flow velocity and thus the dynamic pressure. This stabilizes the dynamic pressure at the first differential pressure sampling point and the second differential pressure sampling point, ensuring the normal pressure measurement of the dual-flange differential pressure transmitter.

[0015] In a preferred embodiment of the differential pressure density measuring device of this utility model: the external discharge pipe is composed of a horizontal section and a vertical section, and the external discharge pipe is disposed at the top of the horizontal section.

[0016] In a preferred embodiment of the differential pressure density measuring device of this utility model: the diameter of the vertical tube is larger than the diameter of the horizontal tube, and the diameter of the vertical tube is 100 mm, while the diameter of the horizontal tube is 50 mm. By adopting an enlarged diameter design for the vertical tube, the slurry flow rate can be effectively reduced, thereby reducing the dynamic pressure impact on the first differential pressure sampling point and the second differential pressure sampling point.

[0017] In a preferred embodiment of the differential pressure density measuring device of this utility model: the horizontal pipe extends for at least 0.2 meters after changing from horizontal to vertical, and is then fixedly connected to the vertical pipe. The top of the vertical pipe is at least 0.2 meters higher than the first differential pressure sampling point. This design ensures the stability of the slurry flow from the horizontal pipe to the vertical pipe and from the vertical pipe to the outflow pipe, avoiding turbulence. Simultaneously, it ensures that the first differential pressure sampling point can effectively detect slurry with a stable flow rate.

[0018] In a preferred embodiment of the differential pressure density measuring device of this utility model: the total length of the vertical tube is 2.2 meters, and the distance between the first differential pressure sampling point and the second differential pressure sampling point is 1.5 meters.

[0019] In a preferred embodiment of the differential pressure density measuring device of this utility model: the air inlet pipe is designed in the shape of an inverted fishhook, and the diameter of the air inlet pipe is 20 mm. Due to the smaller diameter of the air inlet pipe than the outflow pipe and its special shape, the flow of slurry inside the outflow pipe can be effectively monitored. If the diaphragm valve opening is too large, slurry will overflow from the air inlet pipe, requiring further adjustment of the diaphragm valve until the air inlet pipe stops overflowing. At this point, the internal slurry flow rate is stable, thereby stabilizing the dynamic pressure between the first differential pressure sampling point and the second differential pressure sampling point.

[0020] In a preferred embodiment of the differential pressure density measuring device of this utility model, it further includes:

[0021] The flushing unit includes a flushing pipe fixedly connected to the horizontal pipe, and a second electric valve disposed inside the flushing pipe. Flushing of the equipment's interior can be achieved by controlling the first and second electric valves.

[0022] In a preferred embodiment of the differential pressure density measuring device of this utility model: one end of the horizontal pipe of the horizontal access unit is connected to the desulfurization absorption tower, and one end of the discharge pipe of the discharge unit is connected to the grounding pit.

[0023] The beneficial effects of this invention are as follows: the slurry enters the horizontal pipe from the desulfurization absorption tower, and after the horizontal pipe extends, it connects to the vertical pipe. The expanded diameter design of the vertical pipe reduces the flow velocity, stabilizes the flow direction, avoids turbulence, and ensures that the first and second differential pressure sampling points can be effectively detected. Adjusting the opening of the diaphragm valve controls the slurry in the top horizontal section of the discharge pipe from overflowing into the atmospheric pipe, reducing the dynamic pressure of the slurry, stabilizing the impact dynamic pressure on the first and second differential pressure sampling points, and ensuring the normal detection of the dual-flange differential pressure transmitter. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments of this utility model will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this utility model, and are not intended to limit the utility model.

[0025] Figure 1 A schematic diagram of the overall structure of this utility model is shown.

[0026] Figure 2 A schematic diagram of the overall structure of the prior art is shown. Detailed Implementation

[0027] To enable those skilled in the art to better understand this utility model, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0028] The terminology used in this invention refers to those general terms currently widely used in the art in consideration of the functionality of this invention; however, these terms may vary according to the intent, precedent, or new technology of those skilled in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of this invention. Therefore, the terminology used in this specification should not be construed as simple names, but rather based on the meaning of the terms and the overall description of this invention.

[0029] Reference Figure 1 This embodiment provides a differential pressure density measuring device, which includes,

[0030] The horizontal access unit 1 includes a horizontal pipe 11 and a diaphragm valve 12 adapted to be installed inside the horizontal pipe 11; a first electric valve 13 is provided inside the horizontal pipe 11.

[0031] The vertical measurement unit 2 includes a vertical pipe 21 fixedly connected to one end of the horizontal pipe 11, a first differential pressure sampling point 22 disposed inside the vertical pipe 21, and a second differential pressure sampling point 23 disposed inside the vertical pipe 21; the output ends of the first differential pressure sampling point 22 and the second differential pressure sampling point 23 are connected to a dual-flange differential pressure transmitter 24.

[0032] The external discharge unit 3 includes an external discharge pipe 31 fixedly connected to the end of the vertical pipe 21 away from the horizontal pipe 11, and an atmospheric connection pipe 32 located outside the external discharge pipe 31. When the slurry 100 enters the interior of the horizontal pipe 11 from the desulfurization absorption tower 5, it gradually enters the interior of the vertical pipe 21 and finally discharges into the grounding pit 6 through the external discharge pipe 31. By adjusting the opening of the diaphragm valve 12, the slurry 100 in the top horizontal section 311 of the external discharge pipe 31 will not overflow into the atmospheric connection pipe 32, thereby reducing the flow velocity and thus reducing the dynamic pressure. This stabilizes the dynamic pressure at the first differential pressure sampling point 22 and the second differential pressure sampling point 23, ensuring the normal pressure measurement of the dual-flange differential pressure transmitter 24.

[0033] The external discharge pipe 31 consists of a horizontal section 311 and a vertical section 312, with the external discharge pipe 31 located at the top of the horizontal section 311.

[0034] The diameter of the vertical pipe 21 is larger than that of the horizontal pipe 11, with the vertical pipe 21 having a diameter of 100 mm and the horizontal pipe 11 having a diameter of 50 mm. By adopting an enlarged diameter design for the vertical pipe 21, the flow velocity of the slurry 100 can be effectively reduced, thereby reducing the dynamic pressure impact on the first differential pressure sampling point 22 and the second differential pressure sampling point 23.

[0035] The horizontal pipe 11 extends at least 0.2 meters from horizontal to vertical and is then fixedly connected to the vertical pipe 21. The top of the vertical pipe 21 is at least 0.2 meters higher than the first differential pressure sampling point 22. This design ensures the stability of the slurry 100 flowing from the horizontal pipe 11 to the vertical pipe 21 and from the vertical pipe 21 to the outflow pipe 31, preventing turbulence. Simultaneously, it ensures that the first differential pressure sampling point 22 can effectively detect the stable flow rate of the slurry 100.

[0036] The vertical tube 21 has a total length of 2.2 meters, and the distance between the first differential pressure sampling point 22 and the second differential pressure sampling point 23 is 1.5 meters.

[0037] The air inlet pipe 32 has an inverted fishhook shape and a diameter of 20 mm. Due to its smaller diameter than the external discharge pipe 31 and its special shape, the flow of slurry 100 inside the external discharge pipe 31 can be effectively monitored. If the opening of the diaphragm valve 12 is too large, slurry 100 will overflow from the air inlet pipe 32. In this case, the diaphragm valve 12 needs to be adjusted until the air inlet pipe 32 stops overflowing. At this point, the flow rate of the internal slurry 100 is stable, thereby stabilizing the dynamic pressure between the first differential pressure sampling point 22 and the second differential pressure sampling point 23.

[0038] One end of the horizontal pipe 11 of the horizontal access unit 1 is connected to the desulfurization absorption tower 5, and one end of the discharge pipe 31 of the discharge unit 3 is connected to the grounding pit 6.

[0039] After the slurry 100 enters the horizontal pipe 11 from the desulfurization absorption tower 5, it gradually enters the vertical pipe 21 and is finally discharged into the grounding pit 6 through the external discharge pipe 31. The vertical pipe 21 adopts an expanded diameter design, which can effectively reduce the flow velocity of the slurry 100, thereby reducing the dynamic pressure impact on the first differential pressure sampling point 22 and the second differential pressure sampling point 23. The horizontal pipe 11 extends at least 0.2 meters from horizontal to vertical and is fixedly connected to the vertical pipe 21. The top of the vertical pipe 21 is at least 0.2 meters higher than the first differential pressure sampling point 22; this ensures the stability of the slurry 100 flowing from the horizontal pipe 11 to the vertical pipe 21 and from the vertical pipe 21 to the external discharge pipe 31, avoiding turbulence, and also ensuring that the first differential pressure sampling point 22 can effectively detect the slurry 100 with a stable flow velocity. By adjusting the opening of the diaphragm valve 12, the slurry 100 in the top horizontal section 311 of the external discharge pipe 31 will not overflow into the air inlet pipe 32, thereby reducing the flow velocity and thus reducing the dynamic pressure. This stabilizes the dynamic pressure at the first differential pressure sampling point 22 and the second differential pressure sampling point 23, ensuring the normal pressure measurement of the dual-flange differential pressure transmitter 24. The air inlet pipe 32 is smaller than the diameter of the external discharge pipe 31 and has a special shape and structure, which can effectively monitor the slurry 100 flowing inside the external discharge pipe 31. If the opening of the diaphragm valve 12 is too large, the slurry 100 will overflow from the air inlet pipe 32. In this case, the diaphragm valve 12 needs to be adjusted until the air inlet pipe 32 no longer overflows. At this time, the flow velocity of the internal slurry 100 is stable, thereby stabilizing the dynamic pressure at the first differential pressure sampling point 22 and the second differential pressure sampling point 23.

[0040] In summary, slurry 100 enters the horizontal pipe 11 from the desulfurization absorption tower 5. The horizontal pipe 11 extends and connects to the vertical pipe 21. The expanded diameter design of the vertical pipe 21 reduces the flow velocity, stabilizes the flow direction, and avoids turbulence, ensuring effective detection at the first differential pressure sampling point 22 and the second differential pressure sampling point 23. Adjusting the opening of the diaphragm valve 12 controls the slurry 100 in the top horizontal section 311 of the discharge pipe 31 from overflowing into the atmospheric vent pipe 32, reducing the dynamic pressure of the slurry 100 and stabilizing the impact dynamic pressure on the first differential pressure sampling point 22 and the second differential pressure sampling point 23, ensuring normal detection by the dual-flange differential pressure transmitter 24.

[0041] As one embodiment provided, such as Figure 1 It also includes a rinsing unit 4, which includes a rinsing pipe 41 fixedly connected to the horizontal pipe 11, and a second electric valve 42 disposed inside the rinsing pipe 41. By controlling the first electric valve 13 and the second electric valve 42, the inside of the equipment can be rinsed.

[0042] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of this utility model.

Claims

1. A differential pressure density measurement device, characterized by: include, A horizontal access unit (1) includes a horizontal pipe (11) and a diaphragm valve (12) adapted to be installed inside the horizontal pipe (11); a first electric valve (13) is provided inside the horizontal pipe (11); A vertical measuring unit (2) includes a vertical pipe (21) fixedly connected to one end of the horizontal pipe (11), a first differential pressure sampling point (22) disposed inside the vertical pipe (21), and a second differential pressure sampling point (23) disposed inside the vertical pipe (21); the output ends of the first differential pressure sampling point (22) and the second differential pressure sampling point (23) are connected to a dual-flange differential pressure transmitter (24); The external discharge unit (3) includes an external discharge pipe (31) fixedly connected to the end of the vertical pipe (21) away from the horizontal pipe (11), and an air inlet pipe (32) disposed outside the external discharge pipe (31).

2. The differential pressure density measurement device of claim 1, wherein: The external discharge pipe (31) consists of a horizontal section (311) and a vertical section (312), and the external discharge pipe (31) is located at the top of the horizontal section (311).

3. The differential pressure density measurement device of claim 2, wherein: The diameter of the vertical pipe (21) is larger than the diameter of the horizontal pipe (11), and the diameter of the vertical pipe (21) is 100 mm, while the diameter of the horizontal pipe (11) is 50 mm.

4. The differential pressure density measurement device of claim 3, wherein: The horizontal tube (11) extends for at least 0.2 meters after changing from horizontal to vertical, and is then fixedly connected to the vertical tube (21). The top of the vertical tube (21) is at least 0.2 meters higher than the first differential pressure sampling point (22).

5. The differential pressure density measurement device of claim 4, wherein: The vertical tube (21) has a total length of 2.2 meters, and the distance between the first differential pressure sampling point (22) and the second differential pressure sampling point (23) is 1.5 meters.

6. The differential pressure density measurement device of claim 5, wherein: The air inlet pipe (32) is designed in the shape of an inverted fishhook, and the diameter of the air inlet pipe (32) is 20 mm.

7. The differential pressure density measurement device of claim 6, wherein: It also includes, The flushing unit (4) includes a flushing pipe (41) fixedly connected to the horizontal pipe (11) and a second electric valve (42) disposed inside the flushing pipe (41).

8. The differential pressure density measuring device according to any one of claims 2 to 7, characterized in that: One end of the horizontal pipe (11) of the horizontal access unit (1) is connected to the desulfurization absorption tower (5), and one end of the discharge pipe (31) of the discharge unit (3) is connected to the grounding pit (6).

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