CN215866247U

CN215866247U - Density measuring device for wet desulphurization

Info

Publication number: CN215866247U
Application number: CN202121617038.5U
Authority: CN
Inventors: 卢忠阳; 杨善涛; 王晓红; 杨凤岭; 孙德山; 张坤玉; 王冲; 刘振华; 李泽风
Original assignee: Shandong Guoshun Construction Group Co Ltd
Current assignee: Shandong Guoshun Construction Group Co Ltd
Priority date: 2021-07-16
Filing date: 2021-07-16
Publication date: 2022-02-18
Anticipated expiration: 2031-07-16

Abstract

The utility model discloses a density measuring device for wet desulphurization, which comprises a measuring vertical pipe, wherein the measuring vertical pipe is connected with a slurry pipeline, the measuring vertical pipe comprises a PH measuring vertical pipe and a density measuring vertical pipe, the top and the bottom of the PH measuring vertical pipe are respectively connected with a liquid inlet pipeline and a liquid outlet pipeline of the slurry pipeline, the bottom of the density measuring vertical pipe is connected with the slurry pipeline, a high-position PH meter and a low-position PH meter are arranged on the PH measuring vertical pipe, a high-position pressure transmitter and a low-position pressure transmitter are arranged on the density measuring vertical pipe, and a buffer is arranged at the top of the density measuring vertical pipe. The proper range and precision of the transmitter and the installation position of the transmitter with proper size are selected through theoretical calculation, and the density of the slurry of the absorption tower can be accurately and periodically sampled and measured. And an intelligent controller and an automatic calibration algorithm are adopted, so that the repeatability and consistency of the measurement result of the measuring device are ensured. The whole set of measuring device can reliably work for a long time in a maintenance-free state, and the stable operation of a wet desulphurization system is guaranteed.

Description

Density measuring device for wet desulphurization

Technical Field

The utility model relates to the technical field of wet desulphurization, in particular to a density measuring device for wet desulphurization.

Background

Wet desulphurization (WFGD) is a commonly used flue gas desulphurization technology, limestone slurry density is a very important process index, SO2 in flue gas reacts with Ca + in the desulphurization reaction process, CaSO4 is finally generated after oxidation, and when the slurry density value in an absorption tower exceeds 1150kg/m3, the content of CaSO4 is relatively high, and a slurry discharge pump needs to be started.

Currently, many wet desulfurization methods are commonly used in several density measurement modes:

1. the method is greatly influenced by the flow disturbance of slurry in the absorption tower by adopting the conversion of a high-low liquid level meter or a differential pressure type densimeter directly installed on the absorption tower, has low measurement precision, is easy to drift, and has unreliable measurement results.

2. The mass flow type is adopted, so that the precision is high, the measurement result is reliable, but the abrasion is easy to happen, the service life is short, and the use cost is high.

During the operation of the wet desulphurization system, if the density measurement fails or false signals occur, the full automatic operation of the desulphurization system will be seriously affected, so a reliable measurement device is necessarily needed to accurately measure the density of the slurry.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems in the prior art, the utility model provides a density measuring device for wet desulphurization.

The technical scheme adopted by the utility model for solving the technical problems is as follows: this density measurement device for wet flue gas desulfurization, including measuring the riser, measuring the riser and being connected with the thick liquid pipeline, the measurement riser includes PH measurement riser and density measurement riser, and the top and the bottom of PH measurement riser are connected with the feed liquor pipeline and the play liquid pipeline of thick liquid pipeline respectively, and the bottom and the thick liquid pipeline of density measurement riser are connected, are equipped with high-order PH meter and low-order PH meter on the PH measurement riser, are equipped with high-order pressure transmitter and low-order pressure transmitter on the density measurement riser, and density measurement riser top is equipped with the buffer.

Furthermore, a liquid inlet pipeline is connected with the absorption tower through a slurry interface, and a flow regulating valve and an inlet pneumatic valve are arranged on the liquid inlet pipeline.

Furthermore, a flushing water pipe and an isolation hand valve are further arranged on the liquid inlet pipeline, the flushing water pipe is externally connected with a water source through a flushing water interface, and a flushing pneumatic valve is arranged on the flushing water pipe.

Furthermore, the top of the density measuring vertical pipe is connected with a buffer, and an overflow port is arranged on the buffer.

Furthermore, an emptying pneumatic valve is arranged on the liquid outlet pipeline, and the liquid outlet pipeline discharges the slurry through a liquid outlet.

Further, the overflow port and the liquid discharge port are connected with the desulfurization pit and discharge the slurry used by the measuring device into the desulfurization pit.

Further, the measuring device is in wireless connection with the cloud Internet of things platform.

Furthermore, the measuring device works periodically and measures the periodic density of the wet desulphurization in the desulphurization tower.

In summary, the technical scheme of the utility model has the following beneficial effects:

the proper range and precision of the transmitter and the installation position of the transmitter with proper size are selected through theoretical calculation, and the density of the slurry of the absorption tower can be accurately and periodically sampled and measured. By adopting the intelligent cloud Internet of things platform and an automatic calibration algorithm, the repeatability and the consistency of the measurement result of the measurement device are ensured. The whole set of measuring device can reliably work for a long time in a maintenance-free state, and the stable operation of a wet desulphurization system is guaranteed.

Drawings

Fig. 1 is an overall structural view of the present invention.

In the figure:

1. the system comprises a slurry interface, 2, a flow regulating valve, 3, an inlet pneumatic valve, 4, a flushing water interface, 5, a flushing pneumatic valve, 6, an isolation hand valve, 7, a PH measuring vertical pipe, 8, a high-position PH meter, 9, a low-position PH meter, 10, a density measuring vertical pipe, 11, a buffer, 12, an overflow port, 13, a high-position pressure transmitter, 14, a low-position pressure transmitter, 15, an emptying pneumatic valve, 16, a discharge port and 17, a cloud Internet of things platform.

Detailed Description

The features and principles of the present invention will be described in detail below with reference to the accompanying drawings, which illustrate embodiments of the utility model and are not intended to limit the scope of the utility model.

As shown in figure 1, the utility model is provided with a sampling port on a desulfurization absorption tower, is connected with the absorption tower through a slurry interface 1, and regulates the flow of slurry entering the device through a flow regulating valve 2 before the measuring device is used, so as to prevent the excessive flow of slurry from influencing the desulfurization operation.

The utility model is connected with a flushing water pipeline through a flushing water port 4, and the flushing water adopts a water source with the clean density of 1000kg/m 3.

The utility model is connected to the desulfurization pit through the discharge port 16 and the overflow port 12, and discharges the slurry used by the measuring device.

When the intelligent high-level slurry concentration measuring device works, a periodic working mode is adopted, a control program is arranged in the intelligent cloud Internet of things platform 17, when a measuring program is started each time, the flushing pneumatic valve 5 and the exhaust pneumatic valve 15 are closed, the inlet pneumatic valve 3 is opened, the desulfurized slurry enters the PH measuring vertical pipe 7 and the density measuring vertical pipe 10, when the low-level pressure transmitter 14 and the high-level pressure transmitter 13 respectively detect pressure, or the inlet pneumatic valve 3 is opened for more than set time, the inlet pneumatic valve 3 is closed, after standing for a period of time, the measured values of the low-level pressure transmitter 14 and the high-level pressure transmitter 13 are obtained at the same time, the slurry density is calculated, the measured values of the high-level PH meter 8 and the low-level PH meter 9 are obtained, and the slurry PH is obtained through calculation. The drain air valve 15 is then opened to drain the slurry, and the flush air valve 5 is then opened to drain the pipeline flush. The row air valve 15 is then closed and the density measurement standpipe 10 is flushed, then the flush pneumatic valve 5 is closed and the row air valve 15 is opened and all liquid is drained. And finally, closing the air exhaust valve 15, opening the flushing air-operated valve 5 to fill the PH measuring stand pipe 7 with water, and closing the flushing air-operated valve 5 to finish the whole measuring process.

The device has the function of automatic density calibration, a control program is arranged in the cloud internet of things platform 17, the calibration program is triggered regularly or manually, the air exhaust valve 15 is opened at first when the calibration program is started each time, liquid in the density measurement vertical pipe 10 is emptied, the flushing air valve 5 is opened to flush an emptying pipeline, then the air exhaust valve 15 is closed, after the density measurement vertical pipe 10 is filled with water with the density of 1000kg/m3, the flushing air valve 5 is closed, after the device is kept still for a period of time, measurement values of the low-level pressure transmitter 14 and the high-level pressure transmitter 13 are obtained at the same time, a deviation value between the converted density of the measurement values and the theoretical density value of the water of 1000kg/m3 is calculated, and the deviation value is stored in the cloud internet of things platform 17.

The isolation hand valve 6 in the utility model is used for back washing the flow regulating valve 2 and the inlet pneumatic valve 3 during maintenance, and particularly, the isolation hand valve 6 is closed and the flushing pneumatic valve 5 is opened during operation.

The purpose of the buffer 11 in the present invention is to prevent the slurry from flowing too fast, causing a large amount of slurry to flow out through the overflow 12.

The cloud Internet of things platform 17 has the connection capacity of an industrial Internet cloud, and can upload the measurement data of the density measurement device and the working state to the cloud, analyze and diagnose the density meter in real time at the cloud, judge the working state of the density meter, and perform remote early warning, maintenance and correction.

The device is mainly used as a periodic density measuring device for wet desulphurization and is used for the slurry discharge control of the absorption tower.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the present invention by those skilled in the art without departing from the spirit of the present invention are intended to be covered by the protection scope defined by the claims of the present invention.

Claims

1. The utility model provides a density measurement device for wet flue gas desulfurization, is connected with the thick liquid pipeline including measuring the riser, its characterized in that, it includes PH measurement riser and density measurement riser to measure the riser, and the top and the bottom of PH measurement riser are connected with the feed liquor pipeline and the play liquid pipeline of thick liquid pipeline respectively, and the bottom and the thick liquid pipeline of density measurement riser are connected, are equipped with high-order PH meter and low-order PH meter on the PH measurement riser, are equipped with high-order pressure transmitter and low-order pressure transmitter on the density measurement riser, and density measurement riser top is equipped with the buffer.

2. The density measurement device for wet desulphurization according to claim 1, wherein the liquid inlet pipeline is connected with the absorption tower through a slurry interface, and the liquid inlet pipeline is provided with a flow regulating valve and an inlet pneumatic valve.

3. The density measuring device for wet desulphurization according to claim 2, wherein the liquid inlet pipeline is further provided with a flushing water pipe and an isolation hand valve, the flushing water pipe is externally connected with a water source through a flushing water interface, and the flushing water pipe is provided with a flushing pneumatic valve.

4. The density measuring device for wet desulfurization according to claim 1, wherein the top of the vertical density measuring pipe is connected to the buffer and the buffer is provided with an overflow port.

5. The density measurement device for wet desulfurization according to claim 4, wherein an evacuation pneumatic valve is provided on the liquid outlet pipe, and the liquid outlet pipe discharges the slurry through a liquid discharge port.

6. The density measuring apparatus for wet desulfurization according to claim 5, wherein the overflow port and the liquid discharge port are connected to the desulfurization pit and discharge the slurry used by the measuring apparatus into the desulfurization pit.

7. The density measurement device for wet desulphurization according to any one of claims 1-6, wherein the measurement device is connected with a cloud Internet of things platform.

8. The density measurement device for wet desulphurization according to claim 7, wherein the measurement device is periodically operated to periodically measure the density of the wet desulphurization in the desulphurization tower.