CN204389336U - Serosity density measurement system - Google Patents

Abstract

The utility model discloses a slurry density measurement system. The system comprises: limestone slurry differential pressure measuring equipment and control equipment; Straight slurry pipeline, on which the first opening and the second opening are set; one end of the low-pressure side sampling pipeline is connected to the first opening, and the other end is connected to the negative pressure end of the differential pressure transmitter; the high-pressure side sampling pipeline One end is connected to the second opening, and the other end is connected to the positive pressure end of the differential pressure transmitter; the flushing main valve is set at the water inlet of the flushing line, and the first flushing line is connected to the high-pressure side sampling line close to the differential pressure transmitter One end of the second flushing line is connected to the end of the low-pressure side sampling line close to the differential pressure transmitter; the sampling line and the flushing line are equipped with a differential pressure five-valve group; the control device is used to send valve opening and closing instructions, and receive each Valve status and differential pressure signal, and record display density value. Solved the problem that the sample pipe Louis was blocked.

Description

Slurry Density Measurement System

technical field

The utility model relates to the technical field of slurry density measurement, in particular to a slurry density measurement system.

Background technique

For the wet desulfurization system commonly used in thermal power plants, the desulfurization generally adopts the wet limestone-gypsum flue gas desulfurization process. There are three designed density measurements, namely the density of the medium mill slurry box, the density of the limestone slurry box and the outlet of the absorption tower. Gypsum slurry density. Whether the density measurement of the desulfurization slurry is accurate or not is related to the conversion rate of SO2, that is, the desulfurization efficiency, and is more related to whether the flue gas emission meets the environmental protection requirements. Therefore, the measurement of limestone slurry density must be accurate to provide reliable data for unit operation and environmental supervision departments.

However, in the actual desulfurization slurry density measurement process, due to the complicated process of the wet desulfurization system, the harsh working environment of the measurement equipment, and the complex composition and characteristics of the slurry itself, many problems and difficulties have been caused to the density measurement. For example: (1) The slurry contains sulfate and sulfite, which is weakly acidic; (2) The concentration of chloride ions and fluoride ions in the slurry is high, and the corrosion is strong; (3) The mass fraction of solid substances in the slurry is relatively high , generally controlled at 20% to 30%, strong abrasiveness; (4) The mass fraction of solid matter in the slurry is relatively high, and the flow structure is not good, which is easy to cause solid particles to deposit and block the meter. Therefore, the slurry in the desulfurization system has high solid content, is easy to corrode, wear, and clogs the measuring tube of the instrument, etc., which greatly restricts the selection of the density meter. The selection of the slurry density measuring instrument should fully consider various factors such as corrosion, abrasion, deposition of suspended solid particles, and scaling of the desulfurization slurry, and take into account its usability, reliability, and controllability as much as possible.

At present, the most widely used slurry density measuring instrument in flue gas desulfurization is the mass flowmeter. Its measurement principle is that the measuring tube continuously vibrates at a certain resonance frequency. The vibration frequency changes with the density of the fluid. The density of the fluid can be obtained by measuring the resonant frequency of the tube. The biggest feature of the mass flowmeter is that it can measure the mass flow and density of the medium at the same time, and the measurement accuracy is high, and the measurement process is relatively stable.

However, the mass flowmeter has the following disadvantages: the slurry needs to be circulated externally by power equipment, so the structure of the device is complicated and maintenance is inconvenient. Due to the blockage of the measuring tube due to the high viscosity of the slurry, the measuring tube of the mass flowmeter is often blocked during the operation process, and the normal measurement density is often exited, and the frequent flushing even leads to the failure of measurement. The actual maintenance workload of the maintenance personnel is very large. Due to Due to the inherent corrosion and repeated erosion of the slurry, the measuring tube is easily worn out. In fact, some power plants need to repair or replace the measuring tube in 6 to 8 months. However, the inherent parameter design of the repaired measuring tube has changed, and it is difficult to achieve normal measurement again. .

Therefore, the equipment cost of the mass flowmeter is high, the use and maintenance cost are high, the service life is short, easy to wear, and it is easy to be scrapped due to abrasion after running for less than one year. Taking the actual maintenance of a power plant as an example, the cost of spare parts and maintenance for each 600MW unit in the plant is as high as 200,000 yuan per year. The workload of operation, inspection and maintenance and the pressure of operating costs are relatively high.

Alternatively, another method can be used: differential pressure density measurement. Differential pressure density measurement is an indirect way to measure density, that is, take two points on the pipeline for measuring slurry density and open holes. The distance and position of the two points must be reasonable to create a stable measurement environment. The sampling pipeline is connected to the positive and negative pressure sides of the differential pressure transmitter, and the formula: ΔP=ρgh is used to indirectly calculate the density of the slurry. Among them, ΔP is the differential pressure between the two points ab, g is the acceleration of gravity, ρ is the slurry density, and h is the distance between the two points ab and the pressure sampling position. Therefore, the corresponding slurry density can be calculated by measuring the pressure difference between the two points ab through the differential pressure transmitter. This measurement method is adopted by some power plants, and its advantages are low input cost, wear resistance and corrosion resistance.

However, the conventional differential pressure method for density measurement also has some obvious deficiencies: (1) The conditions of the measurement location are poor. If the pressure measurement point is close to the agitator of the absorption tower, it will be disturbed by the agitator, resulting in large fluctuations in the pressure measurement value. It loses the meaning of measurement; if it is far away from the agitator, the measuring hole of the instrument is easily blocked by crystallization, and even if a protruding flange is used, it is difficult to ensure long-term operation. (2) The measurement error is large. If the distance between the two pressure measurement points is too close, the pressure difference will be very small, difficult to measure accurately, and susceptible to interference; if the distance is too far, the density difference between the two points will be large, which is not representative . Therefore, the measurement accuracy of the conventional differential pressure method for density measurement is not high, and the sampling pipe is easily blocked.

Utility model content

The utility model provides a slurry density measurement system to at least solve the problems that the measurement accuracy is not high and the sampling pipe is easily blocked when the slurry density measurement is carried out by the differential pressure method.

The embodiment of the utility model provides a slurry density measurement system, including: limestone slurry differential pressure measurement equipment and control equipment; the limestone slurry differential pressure measurement equipment includes: slurry pipeline, sampling pipeline, flushing pipeline and differential pressure Transmitter; wherein, the slurry inlet of the slurry pipeline is provided with a slurry inlet sampling valve, and the slurry outlet is connected to a slurry tank; along the slurry flow direction in the slurry pipeline, a section of slurry after the slurry inlet sampling valve The pipeline is a vertical section, and the first opening and the second opening are sequentially arranged from top to bottom at a preset distance on the vertical section as sampling positions; the sampling pipeline includes: a low-pressure side sampling pipeline and a high-pressure side sampling pipeline; one end of the low-pressure side sampling pipeline is connected to the first opening, and the other end is connected to the negative pressure end of the differential pressure transmitter; one end of the high-pressure side sampling pipeline connected to the second opening, and the other end is connected to the positive pressure end of the differential pressure transmitter; the water inlet of the flushing pipeline is provided with a main flushing valve; along the flow direction of the water in the flushing pipeline , after the main flushing valve, the flushing pipeline is divided into a first flushing pipeline and a second flushing pipeline, the first flushing pipeline is connected to the high-pressure side sampling pipeline close to the differential pressure change One end of the transmitter; the second flushing pipeline is connected to the low pressure side sampling pipeline near the end of the differential pressure transmitter; the sampling pipeline and the flushing pipeline are provided with a differential pressure five-valve group The control equipment includes: a control cabinet and a host computer connected to the control cabinet, wherein the control cabinet is respectively connected to the pulp sampling valve, the main flushing valve, the differential pressure five-valve group and the The differential pressure transmitter; the control device is used to send valve opening and closing instructions, receive the status of each valve and the signal of the differential pressure transmitter, and record and display the slurry density value.

In one embodiment, the differential pressure five-valve group includes: a first differential pressure measurement valve, a second differential pressure measurement valve, a balance valve, a first flushing valve, and a second flushing valve; wherein, the first differential pressure The measuring valve is set on the sampling pipeline on the low pressure side; the second differential pressure measuring valve is set on the sampling pipeline on the high pressure side; the balance valve is set on the first differential pressure measuring valve and the second differential pressure measuring valve. Between the pressure measuring valves; the first flushing valve is arranged on the first flushing pipeline; the second flushing valve is arranged on the second flushing pipeline.

In one embodiment, the feed sampling valve is a pneumatic valve; the main flushing valve, the first flushing valve and the second flushing valve are all electric valves; the first differential pressure measuring valve, the Both the second differential pressure measuring valve and the balancing valve are manual valves.

In one embodiment, when the slurry is sampled, the slurry inlet sampling valve, the first differential pressure measurement valve, and the second differential pressure measurement valve are all in an open state, and the balance valve, the flushing main valve, the first flush valve and the second flush valve are all in a closed state.

In one embodiment, when the slurry density is measured, the inlet sampling valve, the balancing valve, the main flushing valve, the first flushing valve, and the second flushing valve are all in a closed state, so The first differential pressure measurement valve and the second differential pressure measurement valve are in an open state.

In one embodiment, when flushing the sampling pipeline, the flushing main valve, the first flushing valve, the second flushing valve, the first differential pressure measuring valve and the second differential pressure The measuring valves are all in an open state; the slurry feeding sampling valve and the balance valve are in a closed state.

In one embodiment, the control cabinet includes: a programmable logic controller (Programmable Logic Controller, PLC for short) control cabinet or a distributed control system (Distributed Control System, DCS for short) control cabinet.

Through the slurry density measurement system of the utility model, the flushing pipeline is connected to the side of the sampling pipeline close to the differential pressure transmitter, and the new five-valve group design structure and installation position make the sampling pipeline flush more thoroughly, which solves the problem of The problem of the blockage of the sampling pipe when the conventional differential pressure method is used; the combination of on-site measurement and remote control is adopted, and the sampling, measurement, data recording and flushing are all sent by the control equipment to the valve. The opening and closing state of the valve is changed to realize Remote automatic control without manual intervention. In addition, the system design is simple, the cost is low, and the maintenance workload and maintenance cost of personnel are greatly reduced during use, which is convenient for popularization and use.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the utility model and constitute a part of the application. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 is a schematic diagram of a slurry density measuring system according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. . Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

The embodiment of the utility model provides a slurry density measurement system, and Fig. 1 is a schematic diagram of the slurry density measurement system in the embodiment of the utility model. As shown in FIG. 1 , the system includes: a limestone slurry differential pressure measurement device 10 and a control device 20 . The structure is described in detail below.

The limestone slurry differential pressure measuring device 10 includes: a slurry pipeline 11, a sampling pipeline 12, a flushing pipeline 13 and a differential pressure transmitter 14 (Differential Pressure Transmitter, referred to as DP);

Wherein, the slurry inlet of the slurry pipeline 11 is provided with a slurry inlet sampling valve V1, and the slurry outlet is connected to the slurry tank; along the slurry flow direction in the slurry pipeline 11, a section of the slurry pipeline after the slurry inlet sampling valve V1 is a vertical section , the first opening (point a) and the second opening (point b) are sequentially arranged from top to bottom on the vertical section at a preset distance as sampling positions; a section of the slurry pipeline where the slurry sampling valve V1 is located can be Set as a horizontal section or with a certain slope angle.

The sampling line 12 includes: a low-pressure side sampling line 121 and a high-pressure side sampling line 122; one end of the low-pressure side sampling line 121 is connected to the first opening (point a), and the other end is connected to the differential pressure transmitter 14. negative pressure end; one end of the high pressure side sampling line 122 is connected to the second opening (point b), and the other end is connected to the positive pressure end of the differential pressure transmitter 14;

The water inlet of the flushing pipeline 13 is provided with a main flushing valve V2; along the flow direction of the water in the flushing pipeline 13, after the main flushing valve, the flushing pipeline 13 is divided into a first flushing pipeline and a second flushing pipeline, the second flushing pipeline A flushing pipeline is connected to one end of the high-pressure side sampling pipeline 122 near the differential pressure transmitter 14 (point b1); the second flushing pipeline is connected to one end of the low-pressure side sampling pipeline 121 close to the differential pressure transmitter 14 (a1 point);

The sampling pipeline 12 and the flushing pipeline 13 are provided with a differential pressure five-valve group (V3, V4, V5, V6 and V7 in Fig. 1);

The control device 20 includes: a control cabinet 21 and a host computer 22 connected to the control cabinet 21, wherein the control cabinet 21 is respectively connected to the pulp sampling valve V1, the main flushing valve V2, the differential pressure five-valve group and the differential pressure transmitter 14; The control device 20 is used to send valve opening and closing instructions, receive the status of each valve and the signal of the differential pressure transmitter 14, and record and display the slurry density value. For example, if the valve receives a closing command, it will close the valve; if it receives an opening command, it will open the valve, so that slurry sampling, slurry density measurement and sampling pipeline flushing can be performed according to the state of the valve (open or closed).

Through the slurry density measurement system of the above embodiment, the flushing pipeline is connected to the side of the sampling pipeline close to the differential pressure transmitter, so that the sampling pipeline is flushed thoroughly, and the problem of easy blockage of the sampling pipeline during conventional differential pressure measurement is solved. Problem: Using the combination of on-site measurement and remote control, the control equipment sends opening and closing instructions to the valve in the process of sampling, measuring, recording data and flushing, changing the opening and closing status of the valve, and realizing remote automatic control without manual intervention. In addition, the system design is simple and the cost is low (the valve group can make full use of the original equipment of the power plant for design and installation), which greatly reduces the maintenance workload and maintenance cost of personnel during use, and is convenient for popularization and use.

At present, in order to prevent the sampling pipe from being blocked, flushing water is introduced through the main flushing valve V2. According to the conventional five-valve group design, flushing valves are generally installed at the root of the sampling pipe, that is, points a and b in Figure 1, but this After this method is implemented in many power plants, after a period of operation, the sampling pipe is blocked, resulting in the failure of the differential pressure transmitter to measure, and manual processing is required to flush the sampling pipe, which is time-consuming and labor-intensive.

In one embodiment, the differential pressure five-valve group includes: a first differential pressure measurement valve V5, a second differential pressure measurement valve V6, a balance valve V7, a first flushing valve V3, and a second flushing valve V4; wherein, the first differential pressure The pressure measuring valve V5 is set on the low-pressure side sampling pipeline; the second differential pressure measuring valve V6 is set on the high-pressure side sampling line; the balance valve V7 is set between the first differential pressure measuring valve V5 and the second differential pressure measuring valve V6; The first flushing valve V3 is arranged on the first flushing pipeline; the second flushing valve V4 is arranged on the second flushing pipeline.

It can be seen that this embodiment changes the design structure and installation position of the valve group of the traditional differential pressure method, so that the sampling pipeline is flushed more thoroughly and is less likely to be blocked.

In one embodiment, the pulp feeding sampling valve V1 is a pneumatic valve; the main flushing valve V2, the first flushing valve V3 and the second flushing valve V4 are all electric valves; the first differential pressure measurement valve V5, the second differential pressure measurement valve Both V6 and balance valve V7 are manual valves. The flushing valves in the conventional differential pressure method are manual valves. In this embodiment, the flushing valves are all electric valves, so that the flushing process can be remotely controlled, and the flushing process can be regarded as a part of the entire measurement process. Avoid blockage of sampling lines and reduce manual intervention.

At initial installation, basic measurements and calibrations are performed using the first differential pressure measurement valve V5, the second differential pressure measurement valve V6 and the balance valve V7. During the whole process of sampling, measuring, data recording and flushing, the first differential pressure measurement valve V5 and the second differential pressure measurement valve V6 are always open, and the balance valve V7 is always closed.

In one embodiment, when slurry sampling is performed, the slurry inlet sampling valve V1, the first differential pressure measurement valve V5, and the second differential pressure measurement valve V6 are all in an open state, and the balance valve V7, the main flushing valve V2, the first flushing valve Both V3 and the second flush valve V4 are closed. The balance valve V7 is only opened when the overall equipment is put into operation and used for inspection and maintenance at the initial stage, and it is closed for the rest of the time. When sampling, the flushing valves are all closed to prevent clean water from entering the pipeline, affecting the density of the slurry and thus affecting the measurement results.

In one embodiment, when the slurry density is measured, the slurry inlet sampling valve V1, the balance valve V7, the main flushing valve V2, the first flushing valve V3, and the second flushing valve V4 are all in the closed state, and the first differential pressure measurement valve V5 And the second differential pressure measuring valve V6 is open. The traditional differential pressure measurement is completed during the flow of the slurry in the measurement pipeline, and the stability of the differential pressure is poor. The density value of the slurry calculated according to the differential pressure conversion has large fluctuations and low accuracy. In this embodiment, based on the slurry density measurement system with the above structure, by changing the state of the valve, the continuous measurement is changed to intermittent measurement (the adjustment of the limestone density by the process operator is also intermittent), on this basis, the static Measurement, that is, when the limestone slurry fills the sampling pipeline, stop the sampling pipeline from entering the slurry, and after the time delay, after the slurry in the sampling pipeline is stable, the sampling data (ie differential pressure) is transmitted to the control device to Records and displays slurry density values. Due to less interference during sampling, the differential pressure transmitter can accurately reflect the differential pressure value, thereby improving the accuracy of the converted slurry density value. After testing, under the same working conditions, the difference between the slurry density value obtained by static measurement and the slurry density value measured by mass flowmeter is within 1%, which shows that compared with the existing differential pressure method, based on The static measurement accuracy of the slurry density measurement system with the above structure is high, which has fully met the requirements of the process and effectively solved the problem of low density measurement accuracy of the traditional differential pressure method.

In one embodiment, when flushing the sampling pipeline, the flushing main valve V2, the first flushing valve V3, the second flushing valve V4, the first differential pressure measurement valve V5, and the second differential pressure measurement valve V6 are all in an open state; Slurry sampling valve V1 and balance valve V7 are closed.

The above-mentioned control cabinet 21 may be a PLC control cabinet or a DCS control cabinet. In practical application, it can be set according to the existing equipment, and the PLC control cabinet is used, which has good compatibility.

It can be seen from the above embodiments that the utility model provides a new design structure and installation position of the differential pressure method valve group, so that the sampling pipeline is flushed thoroughly and is not easy to be blocked. At the same time, based on the structure of the above-mentioned slurry density measurement system, static measurement can be used to improve measurement accuracy. In addition, the control device can change the opening and closing state of the valve through instructions, and then remotely control the entire measurement process (including sampling, measurement, data recording and flushing), realizing fully automatic measurement without human intervention, reducing the workload of the staff .

In order to explain the above-mentioned slurry density measurement system more clearly, the following will be described in conjunction with specific examples. However, it is worth noting that this example is only for better illustration of the utility model, and does not constitute inappropriateness to the utility model. limit.

(1) As shown in Figure 1, install the on-site valve group.

Specifically, install a slurry sampling pneumatic valve V1 for limestone slurry differential pressure measurement on the limestone slurry pipeline, and install a set of limestone slurry sampling pipes vertically behind the pneumatic valve. Holes are opened at points a and b on the sampling pipeline (for the convenience of measurement and calculation, the distance between points a and b can be set to 1.2m), and points a and b pass through differential pressure measuring valves V5 and V6 as the slurry Send to the sampling position on the positive and negative pressure side of the differential pressure transmitter. A balance valve V7 is arranged between V5 and V6, and V5, V6 and V7 are designed as manual valves. During normal measurement operation, V5 and V6 are turned on, and V7 is turned off. V7 is only turned on when the overall equipment is initially put into operation and used for inspection and maintenance.

This scheme adopts a new flushing valve design, and the flushing water is passed through the flushing valves (V3 and V4) on the other side of the sampling pipe (that is, points a1 and b1 in Figure 1). The conventional flushing valve is designed as a manual valve like the balance valve V7. In this scheme, it is designed as an electric valve to realize remote automatic control. The flushing process is considered as an important sub-process of the overall control, thereby completely eliminating the sampling tube from being blocked. clogging problem.

The differential pressure transmitter DP is used for limestone slurry measurement.

Thus, the above-mentioned valves, pipelines and differential pressure transmitters form an on-site measuring device for limestone slurry.

(2) Remote control part: PLC controller or DCS and other independent control systems are used to implement through general-purpose processors, digital signal processors, or application-specific integrated circuit ASICs, or field programmable gate arrays, or discrete gates, or transistor logic , and use hard wiring or based on MODBUS communication protocol for connection.

Use the PLC system or DCS sequence control system to design the full-automatic differential pressure density measurement process, remotely control all valve groups and equipment in the on-site measurement system, and automatically realize the slurry feeding, density measurement, recording, and related functions of the limestone slurry sampling bypass. With functions such as automatic flushing of equipment and pipelines, each action process does not require manual intervention, and it runs cyclically according to the timing design.

In summary, this utility model proposes a new slurry density measurement system based on the characteristics of the desulfurization slurry, the process flow of the desulfurization system, and the actual application conditions of the measurement site, so as to solve the problem of low measurement accuracy and the problem of the sampling tube in the existing differential pressure measurement system. Louis blockage problem. At the same time, considering the actual maintenance cost comprehensively, while ensuring the measurement accuracy and stability, it greatly reduces the maintenance and replacement cost and workload of the measuring element compared with the mass flow meter. The solution is not only to simply measure the density of the slurry, but to carry out intensive and intelligent processing of maintenance and measurement through an external sequential control process, and finally realizes the entire measurement process without manual intervention. According to the test, the slurry density measurement of this scheme is more stable than the conventional differential pressure method, and the measurement accuracy is close to that of the mass flow meter, which meets the process monitoring requirements, and the sampling pipeline is not blocked.

The beneficial effects of the utility model are as follows:

(1) The problem of low measurement accuracy of the conventional differential pressure method is solved. Based on the new slurry density measurement system structure, the continuous measurement is changed to intermittent measurement, and the adjustment of the limestone density by the process operator is also intermittent. On this basis, the effective sampling method of static measurement is adopted, that is, when the limestone slurry is full of samples After the pipeline, stop the sampling pipeline to feed the slurry, and after the time delay, after the slurry in the sampling pipeline is stable, send the sampling data at this time to the DCS for effective density value display, because the sampling system has less interference at this time, The differential pressure transmitter can accurately reflect the differential pressure value, which in turn improves the accuracy of the converted density value.

(2) The problem of Louis blockage of the sampling pipe measured by the conventional differential pressure method is completely solved. Changing the design structure and installation position of the valve group of the traditional differential pressure method can completely eliminate the problem of the blockage of the sampling pipeline, and the entire flushing process is automatically controlled by the control equipment without any manual processing. At the same time, the measurement process has completely included the flushing process, that is, following the principle of automatic flushing once for each measurement, completely eliminating the blockage of the sampling pipeline and differential pressure transmitter.

(3) It integrates the functions of sampling, measurement, data recording and washing, and is remotely and automatically controlled by the control equipment (DCS or PLC system), without any manual operation, and only manual intervention is required for maintenance. This is not available in the traditional differential pressure method. The automatic control program designed by the DCS system not only realizes the precise measurement of the density, but also the maintenance of the measurement system is completed by the DCS system without manual intervention in each link.

(4) The overall design of the scheme is simple and low cost (the valve group can make full use of the original equipment of the power plant for design and installation), the process control is highly achievable, and the measurement accuracy is high. At the same time, the maintenance workload and maintenance of personnel are greatly reduced during use. cost, easy to promote and use. Due to the low investment cost and basically maintenance-free, it can replace the mass flow meter, avoid the problems of high cost and large maintenance of the mass flow meter, and realize energy saving and consumption reduction.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present utility model in detail. Within the protection scope of the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims (7)

1. a serosity density measurement system, is characterized in that, comprising: lime stone slurry differential pressure measurement equipment and opertaing device;

Described lime stone slurry differential pressure measurement equipment comprises: slurry pipe line, sampling line, flushing line and differential pressure transmitter;

Wherein, the slurry place of entering of described slurry pipe line is provided with into slurry sampling valve, and pulp place connects slurry tank; Along the slurry stream in described slurry pipe line to, described in enter to starch sampling valve after one section of slurry pipe line be vertical section, predeterminable range that described vertical section is separated by sets gradually the first perforate and the second perforate, from top to bottom as sample position;

Described sampling line comprises: low-pressure side sampling line and high-pressure side sampling line; One end of described low-pressure side sampling line is connected to described first perforate, and the other end is connected to the negative pressure end of described differential pressure transmitter; One end of described high-pressure side sampling line is connected to described second perforate, and the other end is connected to the positive pressure side of described differential pressure transmitter;

Water inlet place of described flushing line arranges flushing main valve; Along the feed water flow in described flushing line to, after described flushing main valve, described flushing line is divided into the first flushing line and the second flushing line, and described first flushing line is connected to described high-pressure side sampling line near one end of described differential pressure transmitter; Described second flushing line is connected to described low-pressure side sampling line near one end of described differential pressure transmitter;

Described sampling line and described flushing line are provided with differential pressure five valve group;

Described opertaing device comprises: switch board and the main frame be connected with described switch board, wherein, enters to starch sampling valve, described flushing main valve, described differential pressure five valve group and described differential pressure transmitter described in described switch board is connected to respectively; Described opertaing device, for sending valve opening and closing instruction, receives the state of each valve and the signal of described differential pressure transmitter, and record display serum density value.

2. system according to claim 1, is characterized in that,

Described differential pressure five valve group comprises: the first differential pressure measurement valve, the second differential pressure measurement valve, equalizing valve, the first flushing valve and the second flushing valve;

Wherein, described first differential pressure measurement valve is arranged on described low-pressure side sampling line; Described second differential pressure measurement valve is arranged on the sampling line of described high-pressure side; Described equalizing valve is arranged between described first differential pressure measurement valve and described second differential pressure measurement valve; Described first flushing valve is arranged on described first flushing line; Described second flushing valve is arranged on described second flushing line.

3. system according to claim 2, is characterized in that, described in enter to starch sampling valve be pneumatic valve; Described flushing main valve, described first flushing valve and described second flushing valve are motorized valve; Described first differential pressure measurement valve, described second differential pressure measurement valve and described equalizing valve are hand valve.

4. system according to claim 2, it is characterized in that, when carrying out slurries sampling, describedly enter to starch sampling valve, described first differential pressure measurement valve, described second differential pressure measurement valve be all in open mode, described equalizing valve, described flushing main valve, described first flushing valve and described second flushing valve are all in closed condition.

5. system according to claim 2, it is characterized in that, when carrying out serosity density measurement, describedly enter to starch sampling valve, described equalizing valve, described flushing main valve, described first flushing valve and described second flushing valve and be all in closed condition, described first differential pressure measurement valve and described second differential pressure measurement valve are in open mode.

6. system according to claim 2, is characterized in that, when rinsing described sampling line, described flushing main valve, described first flushing valve, described second flushing valve, described first differential pressure measurement valve and described second differential pressure measurement valve are all in open mode; Describedly enter to starch sampling valve and described equalizing valve is in closed condition.

7. system according to any one of claim 1 to 6, is characterized in that, described switch board comprises: programmable logic controller (PLC) PLC control cabinet or dcs DCS switch board.