A kind of source-taking apparatus and method of measuring pH value of liquid in flue gas desulfurization absorption tower
(1) technical field
The present invention relates to the measurement mechanism of liquid pH value in the process for flue gas desulfurization by limestone/lime-gypsum wet absorption tower.
(2) background technology
The measurement of the pH value of limestone/lime-gypsum coal burning flue gas desulfurization system absorption tower slurries is desulphurization system keys of control automatically.At present; the measurement of pH value is to adopt calcium plaster liquid pump forced circulation slurries; on leading to the slurries pipeline of fume desulfurating absorption tower or install and measure the pH meter of slurry pH value in the circulatory pool; since on the slurries pipeline or the slurries in the circulatory pool contain a large amount of gypsum crystals; this measuring method can not be protected effectively to pH meter; the wearing and tearing and the pollution that the pH meter contact are in operation usually be subjected to gypsum crystal in the slurries have reduced certainty of measurement.In order addressing this problem, and to improve the reliability of pH meter, need many transmitters to be installed on the slurries pipeline usually, still, this has caused equipment investment height, baroque new problem again.
(3) summary of the invention
The purpose of this invention is to provide a kind of source-taking apparatus of measuring pH value of liquid in flue gas desulfurization absorption tower, solution pH meter contact is in operation and avoids being subjected to the wearing and tearing and the pollution problems of gypsum crystal in the slurries; And separate and never need power-equipment, still can guarantee the problem of certainty of measurement.
Technical scheme of the present invention: the source-taking apparatus of this measurement pH value of liquid in flue gas desulfurization absorption tower is characterized in that: have in the bottom that absorbs Tata wall 6 and get source mouth 9 under one, have on absorption Tata wall top and get source mouth 10 on one;
Get the mouth 9 interior downward-sloping lower linking tubes 1 that are inserted with in source under above-mentioned, getting on above-mentioned is inclined upwardly in the source mouth 10 is inserted with a upper connecting tube 2, the part of upper connecting tube 2 outside the absorption tower connects upper connecting tube shut-off valve 4, the part of lower linking tube 1 outside the absorption tower connects lower linking tube shut-off valve 3, upper connecting tube 2 is communicated with the top of lower linking tube 1 outside the absorption tower, and intersect Y-shaped, lower linking tube 1 be positioned at above-mentioned two the pipe positions, boundary below have the flushing interface 8 that is used to connect cleaning hose, form fluidisation pipe 7 at lower linking tube 1 and position, upper connecting tube 2 boundary to lower linking tube pipeline section suitable for reading, fluidisation pipe 7 is suitable for reading top cover 11, pH meter contact 5 is in top cover inserts the fluidisation pipe downwards, and the upper end of pH meter contact is connected with top cover by connector 12.
Above-mentioned lower linking tube 1 and the inclination angle a that absorbs between the Tata wall are 10-20 °.
Above-mentioned upper connecting tube 2 is 15-25 ° with horizontal angle of inclination beta.
The inwall of above-mentioned fluidisation pipe, upper connecting tube, lower linking tube has anticorrosive coat.
The method of the source-taking apparatus of above-mentioned measurement pH value of liquid in flue gas desulfurization absorption tower is characterized in that step is as follows:
A, open in the bottom that absorbs Tata wall 6 and to get source mouth 9 under one, open and get source mouth 10 on one absorbing Tata wall top; Under the absorption tower, get source mouth 9 with on get the source-taking apparatus that is connected above-mentioned measurement pH value of liquid in flue gas desulfurization absorption tower between the source mouth 10;
B, open upper connecting tube shut-off valve 4 and lower linking tube shut-off valve 3, the liquid in the absorption tower is incorporated in the fluidisation pipe 7 through lower linking tube 1;
C, liquid separate in fluidisation pipe 7, and the downward post precipitation of the gypsum crystal in the liquid flows in the absorption tower through fluidisation pipe and lower linking tube 1, and the solution of cutting out partial gypsum flows in the absorption tower through fluidisation pipe and upper connecting tube 2;
D, by the pH value of pH meter contact 5 collection liquids in the fluidisation pipe, and show numerical value by pH meter;
E, under the effect of absorption tower slurries gravity, new slurries enter fluidisation pipe 7 through lower linking tube 1, form the Natural Circulation of slurries, the pH value of pH meter contact 5 real-time collection liquids, inlet by lower linking tube shut-off valve and upper connecting tube shut-off valve control absorption tower slurries, open the cleaning hose valve, flushing water washes the gypsum crystal that accumulates on the pH meter contact through flushing interface 8.
Slurries in the absorption tower are got source mouth and lower linking tube and are introduced in the fluidisation pipe and separate under the absorption tower, gypsum crystal in the slurries is post precipitation in the fluidisation pipe, from fluidisation pipe bottom in lower linking tube flows into the absorption tower, slurries in the fluidisation pipe isolated part gypsum solution by fluidisation pipe top through upper connecting tube and on get the source mouth and flow in the absorption tower.
Compare with traditional handicraft, the present invention has following effect: the present invention is simple in structure, saves the energy, and the slurries in the pH value measurement mechanism can not need power-equipment to the absorption tower Natural Circulation.The pH meter contact stretches into fluidisation pipe top downwards, and its top is fixed on the top cover by connector, and the pH meter contact is not subjected to the wearing and tearing and the pollution of gypsum crystal in the slurries, and flushing is convenient, has solved the wearing and tearing and the pollution problems of pH meter contact effectively.Thereby only use a pH meter, just can satisfy the requirement of sulfur removal technology, can guarantee certainty of measurement again simultaneously, have the slurries cleaning, measure characteristics easily.Be applicable to the measurement of lime lime-gypsum method coal burning flue gas desulfurization system absorption tower slurry pH value.
(4) description of drawings
Fig. 1 is the schematic diagram of the embodiment of the invention.
Reference numeral: 1-lower linking tube, 2-upper connecting tube, 3-lower linking tube shut-off valve, 4-upper connecting tube shut-off valve, 5-pH meter contact, 6-absorb to get under Tata wall, 7-fluidisation pipe, 8-flushing interface, the 9-and get source mouth, 11-top cover, 12-connector on source mouth, the 10-.
(5) specific embodiment
Embodiment is referring to Fig. 1, and the source-taking apparatus of this measurement pH value of liquid in flue gas desulfurization absorption tower has in the bottom that absorbs Tata wall 6 and gets source mouth 9 under one, has on absorption Tata wall top and gets source mouth 10 on one.
Get the mouth 9 interior downward-sloping lower linking tubes 1 that are inserted with in source under above-mentioned, above-mentioned lower linking tube 1 and the inclination angle a that absorbs between the Tata wall are 15 °.Getting on above-mentioned is inclined upwardly in the source mouth 10 is inserted with a upper connecting tube 2, and upper connecting tube 2 is 18 ° with horizontal angle of inclination beta.The part of upper connecting tube 2 outside the absorption tower connects upper connecting tube shut-off valve 4, the part of lower linking tube 1 outside the absorption tower connects lower linking tube shut-off valve 3, upper connecting tube 2 is communicated with the top of lower linking tube 1 outside the absorption tower, and intersect Y-shaped, lower linking tube 1 be positioned at above-mentioned two the pipe positions, boundary below have the flushing interface 8 that is used to connect cleaning hose, form fluidisation pipe 7 at lower linking tube 1 and position, upper connecting tube 2 boundary to lower linking tube pipeline section suitable for reading, the inwall of above-mentioned fluidisation pipe, upper connecting tube, lower linking tube all has anticorrosive coat.Fluidisation pipe 7 top covers 11 that are stamped elastomeric material suitable for reading, pH meter contact 5 are in top cover inserts the fluidisation pipe downwards, and the upper end of pH meter contact connects the connector 12 of a nut shape, and this connector is placed on above the top cover.
The method of the source-taking apparatus of above-mentioned measurement pH value of liquid in flue gas desulfurization absorption tower is characterized in that step is as follows:
A, open in the bottom that absorbs Tata wall 6 and to get source mouth 9 under one, open and get source mouth 10 on one absorbing Tata wall top; Under the absorption tower, get source mouth 9 with on get the source-taking apparatus that is connected above-mentioned measurement pH value of liquid in flue gas desulfurization absorption tower between the source mouth 10.
B, open upper connecting tube shut-off valve 4 and lower linking tube shut-off valve 3, the liquid in the absorption tower is incorporated in the fluidisation pipe 7 through lower linking tube 1.
C, liquid separate in fluidisation pipe 7, and the downward post precipitation of the gypsum crystal in the liquid flows in the absorption tower through fluidisation pipe and lower linking tube 1, and the solution of cutting out partial gypsum flows in the absorption tower through fluidisation pipe and upper connecting tube 2.So form the Natural Circulation of liquid.
D, by the pH value of the 5 continuous collection liquids of the pH meter contact in the fluidisation pipe, and show numerical value by pH meter.
E, under the effect of absorption tower slurries gravity, new slurries enter fluidisation pipe 7 through lower linking tube 1, form the Natural Circulation of slurries, inlet by lower linking tube shut-off valve and upper connecting tube shut-off valve control absorption tower slurries, pH meter contact 5 is subjected to washing away of circulating fluid and is difficult for being worn and polluting, when needing flushing, open the cleaning hose valve, flushing water washes the gypsum crystal that accumulates on the pH meter contact through flushing interface 8.