A stirring device that can change the speed and time as required and dynamically display data. Generally, a multi-coagulation test agitator, also known as a coagulation test mixer, a coagulation test agitator, a six-coupler, a six-mixer, a six-mixer, and a round or square stirring test cup are mixed. The main equipment for the condensation precipitation beaker test.
the term
First, the coagulation sedimentation beaker test
A method of applying a stirred cup series to study or control a coagulation sedimentation process. Also known as coagulation test, coagulation beaker test, beaker stirring test.
Second, the simulation test
The test procedure for the similarity of mixing, flocculation and sedimentation production process in the coagulation sediment beaker test and the water purification plant was explored.
Third, the mixer
A stirring device that can change the speed and time as required. Generally, a multi-mixer, also known as a multi-position agitator or a group of agitators, is the main equipment for the coagulation and precipitation beaker test.
Fourth, the mixing test cup
A container for holding a water sample in a coagulation sediment beaker test.
Fifth, the speed gradient
The ratio of the velocity component to the distance component between two adjacent liquid layers. It can indirectly reflect the contact collision rate of particles and the growth scale and density of flocs during flocculation.
Simulation test procedure
First, the mixing speed and time should be determined according to the following steps:
1. Determine the speed gradient during the mixing process of the water purification plant and calculate the mixing and stirring speed.
2. Take the mixed water sample at the end of the mixing plant of the water purification plant and immediately place it in the set position of the agitator. Set the flocculation speed gradient to a value of 100 ~ 20, stir for a certain time of 5 ~ 10min, and measure the turbidity after 5min of static precipitation.
3. Place a set of mixing cups filled with raw water samples in the set position of the agitator. According to the first paragraph of this article, set the mixing and stirring speed, and set the different mixing and stirring time for each cup; set the flocculation stirring speed and time according to the second paragraph of this article.
4. Start the agitator, add the same variety and dosage of the agent, and stir until the set time. The cups are statically precipitated for 5 minutes and then sampled to determine the turbidity.
5. Repeat paragraphs 3 to 4 of this article until the turbidity of the water sample of a stirring cup is the same as or similar to the second paragraph of this article. The mixing and stirring speed and time of the mixing cup are the simulated mixing operation parameters.
2. According to the structure of the flocculation tank of the water purification plant, the flocculation stirring speed and time are divided into several files, and the simulation test should be carried out according to the following steps:
1. The first gear flocculates the stirring speed and time.
1) Determine the speed gradient of the first gear of the flotation tank of the water purification plant, and calculate the first-speed flocculation stirring speed.
2) Take the water sample at the end of the first stage of the flocculation tank, immediately place it in the set position of the agitator, and stir for 5 min with a speed lower than the first speed. The turbidity was measured by sampling after 5 min of static precipitation.
3) Place a set of mixing cups filled with raw water samples in the set position of the agitator. Set the mixing and stirring speed and time according to Article 4.2.1; set the first-stop flocculation stirring speed according to item 1) of the clause, and set different mixing time for each cup, and then set according to item 2) of this paragraph. The first step flocculates the stirring speed and time.
4) Start the agitator, add the same type and amount of the drug to the production, and stir until the set time. The turbidity was measured after each cup was statically precipitated 5.
5) Repeat paragraphs 3) to 4) of this paragraph until the turbidity of a stirred cup water sample is the same or similar to item 2) of this paragraph, thus determining the first-stage simulated flocculation stirring speed and time.
2. Referring to the test method of paragraph 1 of this article, the simulated flocculation stirring speed and time of the second and third gears are determined in turn.
3. The sedimentation time should be determined as follows:
1. Determine the effluent turbidity of the sedimentation tank.
2. Place a set of mixing cups filled with raw water samples in the set position of the agitator, set the mixing and stirring speed and time according to Article 4.2.1; set the flocculation stirring speed of each block according to 4.2.2. time.
3. Start the agitator, add the same variety and dosage of the drug to the production, stir to the set time, and measure the turbidity after different static precipitation time.
4. Repeat paragraphs 2 to 3 of this article until the turbidity of the water sample of a stirred cup is the same as or similar to the effluent turbidity of the sedimentation tank, thus determining the simulated sedimentation time.
Velocity gradient calculation
The velocity gradient of the water sample can be determined by the following fractions:
In the middle
P a stirring power, that is, the power consumed when the paddle rotates in the agitating cup,
ω a blade rotation angular velocity, S -1;
G a speed gradient, S -1;
d a blade diameter, m;
b a blade height, m;
Ï a water sample density, kg / m 3;
N-blade rotation speed, r / s;
Dynamic viscosity coefficient of μ-water, pa.s;
GD a drag coefficient, determined according to the specific equipment;
V a water sample volume, m 3 .
Performance requirements achieved by a coagulation test agitator;
1. Microcomputer control, large color LCD screen full Chinese high-definition display, can perform various operations according to menus and prompts, and dynamically display various parameters while stirring;
2, the instrument adopts integrated design, the LCD Chinese controller and mechanical stirring body do not need to be connected by cable, the appearance is beautiful, the operation is convenient, and the safety performance is good;
3. The six mixing shafts can be operated synchronously. Each mixing shaft can run at the same speed; it can also run independently, and each mixing shaft can run independently at different speeds;
4, easy to learn all Chinese programming methods, the program can store up to 20 kinds, each program automatically infinitely variable 10 times
5, can automatically calculate the G value GT value according to different calculation methods of different capacity test cups
6. The stirring shaft is driven by the most accurate and reliable stepping motor. The rotation speed is high and the repeatability error is zero.
7. The automatic dosing system can automatically add medicine and time when the stirring starts; can set multiple automatic dosing according to need;
8. The stirring rod automatic lifting system can automatically rise after the stirring process is completed; there is a voice signal prompt at the end of the sedimentation;
9. The automatic temperature measurement function can automatically calculate the G value according to the temperature and other parameters, and automatically display the GT value when the stirring ends;
10. Equipped with a special round (or square) plexiglass stirring test cup and test tube;
11. The base of the test cup is equipped with an illumination source to observe the flocculation effect more clearly;
12, stainless steel chassis manufacturing, elegant appearance, beautiful appearance;
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