CN112683732A - Method for measuring density of desulfurized limestone slurry of thermal power plant - Google Patents
Method for measuring density of desulfurized limestone slurry of thermal power plant Download PDFInfo
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Abstract
The invention discloses a method for measuring the density of desulfurized limestone slurry in a thermal power plant, which comprises the following measurement steps: the method comprises the following steps: selecting and installing, namely selecting two diaphragm pressure transmitters to replace a traditional densimeter and a pipeline differential pressure transmitter, and installing the diaphragm pressure transmitters on the inner wall of the desulfurizing tower, wherein the height difference between the two is h; step two: monitoring data, namely connecting the pressure transmitters with a DCS (distributed control system) through a network by signals, wherein the DCS is used for processing and displaying the measurement values of the two diaphragm pressure transmitters; step three: reading and calculating data, reading pressure value displayed by operation panel of DCS system, and calculating according to calculation formula
The two equations are subtracted:
thereby calculating the slurry density of the limestone
Description
Technical Field
The invention relates to a method for measuring the slurry density, in particular to a method for measuring the density of desulfurized limestone slurry of a thermal power plant, belonging to the technical field of desulfurization processes of the thermal power plant.
Background
Thermal power plants convert thermal energy generated by burning solid and liquid fuels such as coal, petroleum and natural gas into kinetic energy to produce electric energy. The fuel can be divided into a coal-fired thermal power plant, an oil-fired thermal power plant, a gas thermal power plant and the like according to the category of the fuel. And can be divided into power plants and thermal power plants according to functions. The power plant only produces and supplies electric energy to users; and thermal power plants supply thermal energy in addition to producing and supplying electrical energy to users. The method can be divided into regional thermal power plants, local thermal power plants and mobile train power stations according to the service scale. Regional power plants have large installed capacities and are generally built near fuel bases, such as large coal mines. Also known as pithead power plants. The electric energy is supplied to users through a long-distance power transmission line. The local power plant is mostly built in a load center and needs to transport fuel in a long distance, and the electric energy produced by the local power plant is supplied to users with relatively concentrated power. The thermal power plant is further divided into a low-voltage power plant (the initial pressure of steam is about 0.12-1.5 MPa (MPa)), a medium-voltage power plant (2-4 MPa), a high-voltage power plant (6-10 MPa), an ultrahigh-voltage power plant (12-14 MPa), a subcritical-pressure power plant (16-18 MPa) and a supercritical-pressure power plant (22.6 MPa) according to the steam pressure. In the world, the installed capacity of a thermal power plant accounts for about 70% of the total installed capacity, the power generation accounts for about 80% of the total power generation, in 1989, the installed capacity of the thermal power plant accounts for 74.27% of the total installed capacity, the power generation accounts for 79.7% of the total power generation, and the similar proportion is still expected to be kept by 2000. Therefore, the thermal power plant plays an important role in the development of national economy and the improvement of the living standard of people. In 1875, the first thermal power plant in the world was built at the northern paris train station in france and started to generate electricity, and a small direct current motor was used for nearby illumination. Small thermal power plants are also built in succession in the united states, russia and uk. In 1886, the first ac power plant was built in the united states. In 1882, a thermal power plant with 1 12KW DC generator was built in Shanghai in China for lighting of power lamps.
The lime or limestone desulfurization is to utilize lime or limestone slurry to absorb sulfur dioxide in flue gas in an absorption tower to obtain a mixed solution of calcium sulfite and calcium sulfate, then send the mixed solution to a rare oxidation tower, introduce air for oxidation, and prepare finished calcium sulfate (gypsum) after the obtained calcium sulfate slurry is subjected to centrifugal filtration and washing, the limestone desulfurization is an environment-friendly device which is necessary to be arranged in a thermal power plant, other furnaces and sintering machines, the limestone desulfurization is to fix sulfur elements in coal into solid by using methods such as calcium base and the like SO as to prevent SO2 from being generated when burning, and the limestone desulfurization process is one of the more mature desulfurization processes in the national technology at present.
The performance of the limestone slurry is a main factor influencing the wet flue gas desulfurization efficiency, and the density of the limestone slurry is a main parameter influencing the performance of the limestone slurry, therefore, the density of limestone slurry and gypsum slurry needs to be measured in real time, and two common measurement modes are currently adopted, namely, the density of the slurry is measured by a densitometer, the density meter is a nuclear radiation densitometer and a coriolis densitometer, the nuclear radiation densitometer is a radioactive densitometer, the use requirement is too high, while the Coriolis densimeter has strict standard on flow, is not easy to control, is easy to wear and has inaccurate measurement result, the other density measurement mode is to measure the density by a pipeline differential pressure transmitter, in the measurement process, the differential pressure transmitter is easy to block, and the measurement efficiency is influenced, so that the method for measuring the density of the desulfurized limestone slurry in the thermal power plant needs to be provided.
Disclosure of Invention
The invention aims to provide a method for measuring the density of desulfurized limestone slurry in a thermal power plant, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for measuring the density of desulfurized limestone slurry in a thermal power plant comprises the following measuring steps:
the method comprises the following steps: selecting and installing, namely selecting two diaphragm pressure transmitters to replace a traditional densimeter and a pipeline differential pressure transmitter, and installing the diaphragm pressure transmitters on the inner wall of the desulfurizing tower, wherein the height difference between the two is h;
step two: monitoring data, namely connecting the pressure transmitters with a DCS (distributed control system) through a network by signals, wherein the DCS is used for processing and displaying the measurement values of the two diaphragm pressure transmitters;
step three: reading and calculating data, reading pressure value displayed by operation panel of DCS system, and calculating according to calculation formula
The two equations are subtracted:
，
is the pressure value measured by the upper liquid level diaphragm pressure transmitter,
is the pressure value measured by the lower liquid level diaphragm pressure transmitter,
is the density of limestone slurry inside the desulfurizing tower, g is the gravity acceleration,
is the height of the slurry in the desulfurizing tower,
is the distance from the lower liquid level to the bottom of the tower,
the height difference of the upper and lower liquid levels can be seen from the formula, and the actually measured height difference of the upper and lower liquid levels is combined according to the obtained pressure values of the two liquid levels
The density of the slurry can be directly calculated.
Step four: and comparing and averaging multiple groups of data, readjusting the tower body installation positions of the two diaphragm pressure transmitters according to the calculation process in the third step, obtaining multiple groups of pressure values and height differences, calculating multiple groups of density values, calculating errors, and averaging to obtain more accurate slurry density.
As a preferred technical scheme of the invention, the measurement steps are operated when the stirrer in the tower is stopped, and the normal operation of the oxidation device in the tower is ensured.
As a preferred embodiment of the present invention, the above measurement steps are performed when the lime slurry supply pump and the lime discharge pump are stopped.
As a preferred technical scheme of the invention, according to the calculation formula of the step three, the height of the slurry in the desulfurization tower can be calculated after the density of the slurry is measured
。
As a preferable technical scheme of the invention, the installation position of the diaphragm pressure transmitter is selected to be above the stirrer in the tower, a certain distance is left between the diaphragm pressure transmitter and the stirrer, and the diaphragm pressure transmitter and the stirrer are staggered in the vertical direction.
As a preferred technical scheme of the invention, the distance between the two diaphragm pressure transmitters needs to be controlled to be 0.5-1m, and the distance between the diaphragm pressure transmitter and the highest liquid level of slurry is not too small, which is at least 4-6 times of the distance between the two diaphragm pressure transmitters.
Compared with the prior art, the invention has the beneficial effects that: the invention relates to a method for measuring the density of desulfurized limestone slurry in a thermal power plant, which can monitor the pressure value of the slurry in real time by arranging two diaphragm pressure transmitters and a DCS system, simultaneously calculate a slurry density formula by combining actually measured data and a calculation formula, and calculate a plurality of groups of slurry density data by changing the installation positions of the diaphragm pressure transmitters to compare and take out the average value, thereby greatly improving the measurement accuracy.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for measuring the density of desulfurized limestone slurry in a thermal power plant,
the first embodiment is as follows: the measuring steps are as follows:
the method comprises the following steps: selecting and installing, namely selecting two diaphragm pressure transmitters to replace a traditional densimeter and a pipeline differential pressure transmitter, and installing the diaphragm pressure transmitters on the inner wall of the desulfurizing tower, wherein the height difference between the two is h;
step two: monitoring data, namely connecting the pressure transmitters with a DCS (distributed control system) through a network by signals, wherein the DCS is used for processing and displaying the measurement values of the two diaphragm pressure transmitters;
step three: reading and calculating data, reading pressure value displayed by operation panel of DCS system, and calculating according to calculation formula
The two equations are subtracted:
，
is the pressure value measured by the upper liquid level diaphragm pressure transmitter,
is the pressure value measured by the lower liquid level diaphragm pressure transmitter,
is the density of limestone slurry inside the desulfurizing tower, g is the gravity acceleration,
is the height of the slurry in the desulfurizing tower,
is the distance from the lower liquid level to the bottom of the tower,
the height difference of the upper and lower liquid levels can be seen from the formula, and the actually measured height difference of the upper and lower liquid levels is combined according to the obtained pressure values of the two liquid levels
The density of the slurry can be directly calculated.
Step four: and comparing and averaging multiple groups of data, readjusting the tower body installation positions of the two diaphragm pressure transmitters according to the calculation process in the third step, obtaining multiple groups of pressure values and height differences, calculating multiple groups of density values, calculating errors, and averaging to obtain more accurate slurry density.
In the second embodiment, the above measurement steps need to be performed when the stirrer in the tower is stopped, and meanwhile, the normal operation of the oxidation device in the tower is ensured, so that the scale blockage of the detection probe caused by the generation of calcium sulfite crystals due to insufficient oxidation of slurry in the tower is prevented.
In the third embodiment, the measurement steps are performed when the lime slurry supply pump and the lime discharge pump are stopped, so that the phenomenon of data distortion of the DCS is prevented, and the measurement result of the density is prevented from being influenced.
In the fourth embodiment, according to the calculation formula of the third step, the height of the slurry in the desulfurization tower can be calculated after the density of the slurry is measured
Therefore, the slurry liquid level in the desulfurizing tower can be monitored in real time.
In the fifth embodiment, the installation position of the diaphragm pressure transmitter should be selected above the stirrer in the tower, a certain distance is left, and the diaphragm pressure transmitter is vertically staggered with the stirrer, so as to prevent the influence on the measurement result caused by tower bottom sediment generated by uneven stirring of the slurry.
In the sixth embodiment, the distance between the two diaphragm pressure transmitters needs to be controlled to be 0.5-1m, the distance between the diaphragm pressure transmitter and the highest liquid level of the slurry is not too small, and is at least 4-6 times of the distance between the two diaphragm pressure transmitters, so that the measurement deviation is prevented from being too large.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for measuring the density of desulfurized limestone slurry in a thermal power plant is characterized by comprising the following measuring steps:
the method comprises the following steps: selecting and installing, namely selecting two diaphragm pressure transmitters to replace a traditional densimeter and a pipeline differential pressure transmitter, and installing the diaphragm pressure transmitters on the inner wall of the desulfurizing tower, wherein the height difference between the two is h;
step two: monitoring data, namely connecting the pressure transmitters with a DCS (distributed control system) through a network by signals, wherein the DCS is used for processing and displaying the measurement values of the two diaphragm pressure transmitters;
step three: reading and calculating data, reading pressure value displayed by operation panel of DCS system, and calculating according to calculation formula
The two equations are subtracted:
，
is the pressure value measured by the upper liquid level diaphragm pressure transmitter,
is the pressure value measured by the lower liquid level diaphragm pressure transmitter,
is the density of limestone slurry inside the desulfurizing tower, g is the gravity acceleration,
is the height of the slurry in the desulfurizing tower,
is the distance from the lower liquid level to the bottom of the tower,
the height difference of the upper and lower liquid levels can be seen from the formula, and the actually measured height difference of the upper and lower liquid levels is combined according to the obtained pressure values of the two liquid levels
The density of the slurry can be directly calculated.
2. Step four: and comparing and averaging multiple groups of data, readjusting the tower body installation positions of the two diaphragm pressure transmitters according to the calculation process in the third step, obtaining multiple groups of pressure values and height differences, calculating multiple groups of density values, calculating errors, and averaging to obtain more accurate slurry density.
3. The method for measuring the density of the desulfurized limestone slurry of the thermal power plant according to claim 1, characterized in that: the measurement steps need to be carried out when the stirrer in the tower is stopped, and the normal operation of the oxidation device in the tower is ensured.
4. The method for measuring the density of the desulfurized limestone slurry of the thermal power plant according to claim 1, characterized in that: the above-described measurement steps are performed when the lime slurry supply pump and the lime discharge pump are stopped.
5. The method for measuring the density of the desulfurized limestone slurry of the thermal power plant according to claim 1, characterized in that: according to the stepsThe third step is a calculation formula, and the height of the slurry in the desulfurization tower can be calculated after the density of the slurry is measured
。
6. The method for measuring the density of the desulfurized limestone slurry of the thermal power plant according to claim 1, characterized in that: the installation position of the diaphragm pressure transmitter is selected above the stirrer in the tower, a certain distance is reserved between the diaphragm pressure transmitter and the stirrer, and the diaphragm pressure transmitter and the stirrer are staggered in the vertical direction.
7. The method for measuring the density of the desulfurized limestone slurry of the thermal power plant according to claim 1, characterized in that: the distance between the two diaphragm pressure transmitters needs to be controlled to be 0.5-1m, and the distance between the diaphragm pressure transmitter and the highest liquid level of the slurry is not too small and is at least 4-6 times of the distance between the two diaphragm pressure transmitters.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113640176A (en) * | 2021-07-30 | 2021-11-12 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Lime milk specific gravity measuring method, device and system and computer readable storage medium |
| CN114354443A (en) * | 2022-01-10 | 2022-04-15 | 思立博(上海)工程咨询有限公司 | Differential pressure type digital display mud proportion detection device |
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