CN211825544U

CN211825544U - Differential pressure type liquid densimeter

Info

Publication number: CN211825544U
Application number: CN202020298023.6U
Authority: CN
Inventors: 吴昊
Original assignee: Huadian Luohe Power Generation Co ltd
Current assignee: Huadian Luohe Power Generation Co ltd
Priority date: 2020-03-12
Filing date: 2020-03-12
Publication date: 2020-10-30
Anticipated expiration: 2030-03-12

Abstract

The utility model belongs to the power plant desulfurization absorption tower thick liquid density measurement field, in particular to differential pressure formula hydrodensimeter, a differential pressure formula hydrodensimeter, including absorption tower and test tube, fixedly on the absorption tower be provided with first connecting pipe and second connecting pipe, first connecting pipe passes through first mount pad and first screw and test tube fixed connection, the second connecting pipe passes through second mount pad and second screw and is connected with the test tube, fixedly on the test tube be provided with first stop valve and fourth stop valve, still fixedly on the test tube be provided with first pressure transmitter and second pressure transmitter, the side fixedly connected with inlet tube and drain pipe of test tube, fixedly on the inlet tube set up the second stop valve, fixedly on the drain pipe be provided with the third stop valve; the utility model provides a limestone slurry to the corruption of equipment, the problem of the injury of thick liquid siltation jam sample pipeline and SO2 to peripheral equipment and maintainer.

Description

Differential pressure type liquid densimeter

Technical Field

The utility model belongs to power plant desulfurization absorption tower thick liquid density measurement field, in particular to differential pressure formula hydrodensimeter.

Background

At present, two common density measurement modes are available, one is a Coriolis force principle, and the other is a differential pressure principle. The conventional coriolis densitometer and differential densitometer have many disadvantages in the measurement of the slurry in the absorption tower. Coriolis mass flowmeters are expensive, prone to wear, corrosion, clogging, and are not a good choice for slurry measurements. The current differential pressure densitometer needs to ensure the real-time and accuracy of slurry measurement by virtue of natural slurry discharge or forced circulation of a pump. This practice is extremely abrasive to piping and equipment, requires a large volume of flush water to ensure proper operation of the densitometer, and releases SO2 which is extremely corrosive to surrounding equipment as the slurry is discharged.

The problems that a densimeter used in a desulfurization absorption tower in an existing power plant is complex in equipment structure and high in cost, and is difficult to corrode and block due to the fact that limestone slurry is strong in corrosion and high in equipment failure rate are solved. Based on the existing differential pressure type measuring principle, a novel densimeter is designed. Not only solves various defects of the traditional densimeter, but also improves the accuracy and the stability of measurement.

Based on this the utility model provides a differential pressure formula hydrodensimeter to solve above-mentioned technical problem.

SUMMERY OF THE UTILITY MODEL

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a differential pressure formula hydrodensimeter, includes absorption tower and test tube, fixed first connecting pipe and the second connecting pipe of being provided with on the absorption tower, first connecting pipe is through first mount pad and first screw and test tube fixed connection, the second connecting pipe pass through second mount pad and second screw with the test tube is connected, fixed first stop valve and the fourth stop valve of being provided with on the test tube, still fixed first pressure transmitter and the second pressure transmitter of being provided with on the test tube, the side fixedly connected with inlet tube and the drain pipe of test tube, the fixed second stop valve that sets up on the inlet tube, the fixed third stop valve that is provided with on the drain pipe.

As a further aspect of the present invention, the first stop valve is disposed between the inlet pipe and the first mounting seat, and the fourth stop valve is disposed between the drain pipe and the second mounting seat.

As a further aspect of the present invention, the first pressure transmitter and the second pressure transmitter are disposed on the inlet tube and the detecting tube between the drain tubes.

As a further aspect of the present invention, the length of the first connecting pipe and the second connecting pipe is far less than the length of the detecting pipe.

As a further aspect of the present invention, the first pressure transmitter and the distance between the second pressure transmitters is greater than or equal to 100 mm.

As a further aspect of the present invention, the inner diameter of the detection tube is greater than or equal to three-thirds of the inner diameter of the water inlet tube.

Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

the parts related to the device are common parts in the field, and the device has the advantages of simple structure, high measurement precision, good stability and low cost. Is convenient for popularization.

This device can be with density with the test tube sanitization under the condition of non-staining absorption tower through the inlet tube and the drain pipe that self set up, greatly reduced the corruption condition of scrapping of density test tube, the cost is reduced has greatly reduced the frequency of washing, has saved a large amount of process waters, has also solved the problem that the thick liquid silts up the jam. In addition, the totally-enclosed structure does not need slurry discharge, and eliminates the damage of SO2 release to peripheral equipment and maintainers.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic view of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1-absorption tower, 2-first connecting pipe, 3-first mounting seat, 4-first screw, 5-first stop valve, 6-water inlet pipe, 7-second stop valve, 8-water drain pipe, 9-third stop valve, 10-first pressure transmitter, 11-second pressure transmitter, 12-fourth stop valve, 13-second screw, 14-second mounting seat, 15-second connecting pipe and 16-detecting pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution:

the utility model provides a differential pressure formula hydrodensimeter, including absorption tower 1 and detecting tube 16, fixedly on the absorption tower 1 be provided with first connecting pipe 2 and second connecting pipe 15, first connecting pipe 2 is through first mount pad 3 and first screw 4 and detecting tube 16 fixed connection, second connecting pipe 15 is connected with detecting tube 16 through second mount pad 14 and second screw 13, fixedly on the detecting tube 16 be provided with first stop valve 5 and fourth stop valve 12, still fixedly on the detecting tube 16 be provided with first pressure transmitter 10 and second pressure transmitter 11, the side fixedly connected with inlet tube 6 and the drain pipe 8 of detecting tube 16, fixedly on the inlet tube 6 set up second stop valve 7, fixedly on the drain pipe 8 be provided with third stop valve 9.

Wherein the first shut-off valve 5 is arranged between the water inlet pipe 6 and the first mounting seat 3 and the fourth shut-off valve 12 is arranged between the water outlet pipe 8 and the second mounting seat 14. A first pressure transmitter 10 and a second pressure transmitter 11 are arranged on the sensing pipe 16 between the water inlet pipe 6 and the water outlet pipe 8. The length of the first connecting tube 2 and the second connecting tube 15 is much smaller than the length of the detection tube 16. The distance between the first pressure transmitter 10 and the second pressure transmitter 11 is equal to or greater than 100 mm. The inner diameter of the detection pipe 16 is equal to or more than three-thirds of the inner diameter of the water inlet pipe 6.

When the device is used, the second stop valve 7 and the third stop valve are closed, the first stop valve 5 and the fourth stop valve 12 are opened, and fluid flows into the detection pipe 16 through the first connecting pipe 2 and then flows back into the absorption tower 1 from the second connecting pipe 15. During this time, the density is detected by first pressure transmitter 10 and second pressure transmitter 11 and transmitted to the receiving device. Thereby completing the detection. In the second step, in order to reduce the corrosion of the fluid to the detection pipe 16, the detection pipe 16 needs to be cleaned, at this time, the first stop valve 5 and the fourth stop valve 12 are closed, the second stop valve 7 and the third stop valve 9 are opened, the washing water flows into the detection pipe 16 through the water inlet pipe 6, and then the water is drained from the water drain pipe 8, so that the purpose of cleaning is achieved, and further, the first pressure transmitter 10, the second pressure transmitter 11 and the detection pipe 16 are protected from being corroded. In addition, when the first connecting pipe 2 and the second connecting pipe 15 need to be cleaned, the first screw 4 and the second screw 13 are loosened, and the detection pipe 16 is detached through the first mounting seat 3 and the second mounting seat 14 to complete the cleaning.

Second embodiment:

the working principle of the device is as follows: in view of the actual working conditions in the absorption tower 1 and the convenience in installation and maintenance operations, the installation position of the densimeter is selected to be the middle position of the bottom and the two stirrers of the absorption tower 1. The densitometer is directly connected to the absorption tower 1 through the first mounting base 3 and the second mounting base 14. The first pressure transmitter 10 and the second pressure transmitter 11 for measurement use two independent small-range transmitters, and the two transmitters independently output pressure signals to be transmitted to the DCS. In the DCS configuration, a differential pressure value is calculated by using the two received pressure signals, and a slurry density value is obtained by using logical operation.

ΔΡ＝ρ.g.h

Δ Ρ is the differential pressure measured, in units: pa; (if the unit is KPa, the equation above needs to be multiplied by 1000 to the right of the equal sign).

ρ is the slurry density: unit: the weight ratio of the raw materials is kg/m3,

g is the acceleration of gravity, 9.8N/kg,

h is the vertical distance of the two differential pressure transmitters.

DCS inputs the logical relationship: ρ ═ Δ Ρ/g/h

The pipeline of the densimeter can not only ensure the slurry circulation and the measurement real-time performance, but also ensure that the first pressure transmitter 10 and the second pressure transmitter 11 can be in a relatively stable environment. By means of the slurry circulating pump and the forced circulation of the stirrer of the absorption tower 1 to the slurry, the slurry circulation is formed in the densimeter, so that the densimeter is not blocked, the flushing flow is reduced, meanwhile, the scouring wear of particles in the slurry to a pipeline can be reduced, the influence of the flow speed on pressure measurement is reduced, and the measurement precision is improved.

The densimeter is simplified in structure, SO that the investment cost is reduced, and the defect that SO2 is released when slurry is discharged to corrode peripheral equipment is overcome. Meanwhile, the length of the pipeline is reduced, and the problems of corrosion, abrasion, blockage and the like caused by overlong slurry flow channels are solved. The forced circulation of the slurry circulating pump and the slurry stirrer in the absorption tower 1 is utilized to form the flow of the slurry in the comprehensive measuring device and form a relatively independent and stable space, so that the flow speed of the slurry is controlled, the harm of small particles in the slurry to a pipeline and a transmitter is reduced to the maximum extent, and the influence of the slurry flow on pressure measurement is reduced. The optimized connection design can ensure that the slurry cannot form siltation and blockage inside. The method and the device enable the washing flow to be cancelled, so that the reliability and the accuracy of density measurement are improved, and the influence of frequent washing on the transmitter is reduced.

It should be noted that the slurry stirrer and the slurry circulating pump are all in the prior art, and are not the core features of the device, and the device is not described in detail.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a differential pressure formula hydrodensimeter, includes absorption tower and test tube, its characterized in that: the absorption tower is fixedly provided with a first connecting pipe and a second connecting pipe, the first connecting pipe is fixedly connected with a detection pipe through a first mounting seat and a first screw, the second connecting pipe is connected with the detection pipe through a second mounting seat and a second screw, a first stop valve and a fourth stop valve are fixedly arranged on the detection pipe, a first pressure transmitter and a second pressure transmitter are fixedly arranged on the detection pipe, a water inlet pipe and a water outlet pipe are fixedly connected to the side surface of the detection pipe, a second stop valve is fixedly arranged on the water inlet pipe, and a third stop valve is fixedly arranged on the water outlet pipe.

2. The differential pressure fluid density meter of claim 1, wherein: the first stop valve is arranged between the water inlet pipe and the first mounting seat, and the fourth stop valve is arranged between the water outlet pipe and the second mounting seat.

3. The differential pressure fluid density meter of claim 1, wherein: the first pressure transmitter and the second pressure transmitter are arranged on the detection pipe between the water inlet pipe and the water discharge pipe.

4. The differential pressure fluid density meter of claim 1, wherein: the length of the first connecting pipe and the length of the second connecting pipe are far smaller than the length of the detection pipe.

5. The differential pressure fluid density meter of claim 1, wherein: the distance between the first pressure transmitter and the second pressure transmitter is greater than or equal to 100 mm.

6. The differential pressure fluid density meter of claim 1, wherein: the inner diameter of the detection pipe is more than or equal to three-half of the inner diameter of the water inlet pipe.