CN219342001U

CN219342001U - Device for controlling accurate dosing of sludge centrifugal dehydration

Info

Publication number: CN219342001U
Application number: CN202320246437.8U
Authority: CN
Inventors: 董兴震; 刘国欢; 宋超; 于晓利
Original assignee: Beijing Third Party Environmental Engineering Co ltd
Current assignee: Beijing Third Party Environmental Engineering Co ltd
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2023-07-14
Anticipated expiration: 2033-02-17

Abstract

The utility model relates to a device for controlling accurate dosing of sludge centrifugal dehydration, which comprises a sludge storage tank or a sludge concentration tank, a centrifugal dehydrator, a sludge hopper, a medicine dissolving tank and a filtrate low-solid-content measuring instrument; a screw pump is arranged between the centrifugal dehydrator and the sludge storage tank or the sludge concentration tank, and an electromagnetic flowmeter and a pipeline type sludge concentration microwave transmitter are arranged between the screw pump and the centrifugal dehydrator; a dosing pump and a dosing electromagnetic flowmeter are arranged between the medicine dissolving tank and the centrifugal dehydrator; the sludge hopper is connected with the centrifugal dehydrator; a sampling tube and a water return tube are arranged between the filtrate low-solid content measuring instrument and the centrifugal dehydrator. The device can accurately add the dehydration medicament, improves the existing lag and conservative manual setting mode, reduces a large amount of dehydration medicament consumption, has high accuracy and good repeatability, and saves a large amount of labor cost after being put into operation.

Description

Device for controlling accurate dosing of sludge centrifugal dehydration

Technical Field

The utility model belongs to the technical field of sewage treatment, and particularly relates to a device for controlling accurate dosing of sludge centrifugal dehydration.

Background

The water content of the sludge generated by the sewage treatment plant is up to 99%, and the sludge is required to be subjected to subsequent treatment after being concentrated. The water content of the sludge after concentration is about 95%. The sludge with the water content of 95 percent has higher water content, and is inconvenient for the later treatment and utilization of the sludge. So that the sewage plant generally needs to utilize sludge mechanical dewatering equipment such as a centrifugal dehydrator and the like to carry out sludge mechanical dewatering, so that the water content of the sludge is 80-85%.

In order to improve the sludge dewatering performance, a proper amount of organic polymer sludge dewatering agent is generally and uniformly added before mechanical dewatering to reduce specific resistance of sludge, so that the sludge is easier to dewater after solid phase and liquid phase of the sludge are separated, and the type of the sludge dewatering agent is required to be adapted to the characteristics of the sludge and the type of equipment and the operation working condition.

In actual operation, the influence of the amount of the added sludge dehydrating agent on the solid content of the centrifugally dehydrated mud cake is small and the influence on the quality of the filtrate is large after the addition amount of the sludge dehydrating agent reaches a certain degree. Therefore, when sludge dewatering is carried out, under the condition of meeting the requirements of the dryness of the sludge cake and the quality of supernatant liquid, the continuously increased use amount is not necessary at all, and is also a main cause of flocculant waste on site. In addition, as the amount of the dehydrating agent increases, the quality of the supernatant is better, but in many cases, excessive pursuing of the quality of the supernatant and the addition of the flocculant is not enough, and only the sludge recovery rate of several percent is increased and more sludge dehydrating agent is consumed is not enough. The solid content of the supernatant is controlled within a certain index range.

In general, a certain range of sludge concentration is required for the equipment to be suitable, and more flocculant is consumed by too low or too high sludge concentration. Under the condition of the sludge concentration of normal operation of the equipment, the dosage of the dehydrating agent and the solid content of the sludge to be treated are approximately in a direct proportion relationship, so that under the condition of certain sludge flow, the dosage of the dehydrating agent is adjusted according to the concentration of the sludge, and in many cases, the dosage of the dehydrating agent is not adjusted in time due to the change of the sludge concentration, so that the site operation performance is poor or the crude drug consumption is increased. If the sludge concentration is increased and the adding amount of the sludge dehydrating agent is not increased, the treatment effect is affected, the dryness of the sludge cake is reduced, and the supernatant is turbid; on the contrary, if the sludge concentration is reduced, the waste of the dehydrating agent is formed without reducing the adding amount of the dehydrating agent, and the treatment effect is not obviously increased.

In addition, if the dissolution condition of the sludge dehydrating agent is poor, the actual dosage is insufficient or the concentration of the sludge dehydrating agent is too low, so that the supply of the effective components of the liquid medicine is insufficient, mud cakes with corresponding dryness are difficult to form, and the quality of supernatant is influenced; the concentration of the flocculant is too large, active groups on a high molecular chain of the sludge dehydrating agent can be shielded and wrapped mutually, so that the effective components are difficult to fully exert the effects, and the waste of the medicament is caused; because the dosage of the dehydrating agent is excessive, the redispersion effect of the floccules can damage the stability of the floccules, and the flocculation effect is also bad.

At present, most of sludge dewatering treatments adopt experience values or laboratory test values for dewatering agent addition, and clear and turbid filtrate is observed by naked eyes, so that a great deal of dewatering agents are always conservatively added in order to ensure the dewatering effect, and therefore, most of the conditions can cause great waste of medicaments.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides a device for accurately controlling the dosing of the sludge centrifugal dehydration, which adopts a mode of matching a pipeline type sludge concentration microwave transmitter arranged in front of a centrifugal dehydrator with a filtrate low-solid-content measuring instrument arranged at a filtrate outlet, sets the dosing proportion of a dehydration reagent by monitoring the solid content of the sludge entering the sludge centrifugal dehydrator in real time, further adjusts the dosing quantity according to the solid content in the filtrate, controls the operation frequency of a dosing pump to accurately add the dehydration reagent by utilizing the monitoring means, improves the existing lag and conservative manual setting mode, reduces the consumption of a large amount of dehydration reagents, and is an effective mode for the low-carbonization operation of the sludge dehydration treatment of a sewage treatment plant. The technical problems to be solved by the utility model are realized by the following technical scheme:

the device comprises a sludge storage tank or a sludge concentration tank, a centrifugal dehydrator, a sludge hopper and a medicine dissolving tank;

a screw pump is arranged between the centrifugal dehydrator and the sludge storage tank or the sludge concentration tank, and an electromagnetic flowmeter and a pipeline type sludge concentration microwave transmitter are arranged between the screw pump and the centrifugal dehydrator;

a dosing pump and a dosing electromagnetic flowmeter are arranged between the medicine dissolving tank and the centrifugal dehydrator;

the sludge hopper is connected with a centrifugal dehydrator.

Further, the device for controlling the accurate dosing of the sludge centrifugal dehydration further comprises a filtrate low-solid-content measuring instrument;

a sampling tube and a water return tube are arranged between the filtrate low-solid content measuring instrument and the centrifugal dehydrator.

Further, the pipeline type sludge concentration microwave transmitter is arranged between the electromagnetic flowmeter and the centrifugal dehydrator.

Further, the above-mentioned dosing electromagnetic flowmeter is installed between dosing pump and centrifugal dehydrator.

Further, the dosing pump is a variable frequency pump and is mainly used for conveying the dewatering drug machine to a mud inlet pipeline at the front end of the centrifugal dewatering machine.

Further, the device for controlling the accurate dosing of the centrifugal dehydration of the sludge is controlled by a computer PAC or PLC automatic program for data acquisition and calculation.

Further, the device for controlling the accurate dosing of the centrifugal dehydration of the sludge has the function of being linked with the screw pump by program control, and when the screw pump stops running, the program control dosing pump stops running, and when the screw pump starts, the program also responds simultaneously.

The utility model has the beneficial effects that:

1. the device disclosed by the utility model converts the hysteresis of dosing control into real-time controllability, realizes accurate dosing real-time control of sludge dewatering, feeds back in time, and has the advantages of high measurement accuracy, good repeatability and no need of manual participation;

2. compared with manual adjustment and dosing, the device has the advantages that the qualitative and quantitative conversion is realized, the manual judgment is realized, the machine judgment is realized, and a large amount of labor cost is saved after the device is put into operation;

3. the device greatly saves the addition of the dewatering medicament, thereby saving medicament cost;

4. the device is suitable for the accurate dosing control of sludge dewatering of municipal sewage treatment plants, reclaimed water plants, water purification plants or other industrial wastewater treatment plants, and can be used for new construction plants and transformation projects.

The present utility model will be described in further detail with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic diagram of an apparatus for controlling accurate dosing in centrifugal dewatering of sludge in this embodiment.

In the figure: 1. a sludge storage tank or a sludge concentration tank; 2. a screw pump; 3. an electromagnetic flowmeter; 4. a pipeline type sludge concentration microwave transmitter; 5. a centrifugal dehydrator; 6. a sludge hopper; 7. a drug dissolving tank; 8. a dosing pump; 9. a dosing electromagnetic flowmeter; 10. a sampling tube; 11. a water return pipe; 12. the filtrate is low in solid content.

Detailed Description

The following detailed description, structural features and functions of the present utility model are provided with reference to the accompanying drawings and examples in order to further illustrate the technical means and effects of the present utility model to achieve the predetermined objects.

The embodiment provides a device for controlling the accurate dosing of the centrifugal dehydration of the sludge, and through the use of the device, the device has great advantages compared with manual regulation dosing, and the device is changed from qualitative to quantitative, and from manual judgment to machine judgment. Referring to fig. 1, the apparatus includes a sludge storage tank or sludge concentration tank 1, a centrifugal dehydrator 5, a sludge hopper 6, and a chemical dissolving tank 7. A screw pump 2 is arranged between the centrifugal dehydrator 5 and the sludge storage tank or the sludge concentration tank 1, and an electromagnetic flowmeter 3 and a pipeline type sludge concentration microwave transmitter 4 are arranged between the screw pump 2 and the centrifugal dehydrator 5. The pipeline type sludge microwave concentration meter does not need maintenance, has high measurement accuracy and good repeatability, and avoids a large amount of manual sampling and measurement labor caused by sludge fluctuation.

A dosing pump 8 and a dosing electromagnetic flowmeter 9 are arranged between the medicine dissolving tank 7 and the centrifugal dehydrator 5. The method can fully feed back whether the dehydration medicine machine is excessively added from the perspective of the solid content of the filtrate, provides more accurate control measures for adding the dehydration medicine, and changes the hysteresis quality of medicine adding control into real-time controllability. The sludge hopper 6 is connected with the centrifugal dehydrator 5.

The sludge storage tank or the sludge concentration tank of the embodiment is mainly used for storing or concentrating sludge of the sewage treatment sedimentation tank. The screw pump is used for conveying the sludge from the storage tank to the centrifugal dehydrator. The electromagnetic flowmeter is used for measuring the flow rate of the sludge conveyed by the screw pump. The pipeline type sludge concentration microwave transmitter is used for measuring the solid content of sludge conveyed by the screw pump in real time. The centrifugal dehydrator and the sludge hopper are mainly used for dehydrating and caching the sludge. And then the dewatered sludge is transported and disposed. The medicine dissolving tank is mainly used for dissolving and storing the dehydration medicine. The dosing pump is a variable frequency pump and is mainly used for conveying the dewatering drug machine to a mud inlet pipeline at the front end of the centrifugal dewatering machine. The dosing electromagnetic flowmeter is mainly used for measuring and cumulatively measuring the flow and the total amount of the dewatering medicine machine passing through the dosing pump.

The device for controlling the accurate dosing of the sludge centrifugal dehydration in the embodiment also comprises a filtrate low-solid content measuring instrument 12. A sampling tube 10 and a water return tube 11 are arranged between the filtrate low-solid content measuring instrument 12 and the centrifugal dehydrator 5.

The filtrate low-solid-content measuring instrument of the embodiment is mainly used for measuring the solid content in filtrate, the sampling tube and the water return tube are matched with each other, the low-solid-content measuring instrument samples from the filtrate outlet of the centrifugal machine through the real-time sampling tube and measures in real time, the sample liquid is discharged back to the filtrate outlet through the water return tube in real time, and meanwhile, the low-solid-content measuring instrument has tap water flushing and chemical cleaning functions, so that the accuracy and stable continuous operation of the low-solid-content measuring instrument are fully ensured.

The device flow involved in this embodiment is a conventional dewatering flow in a water plant, and this flow is used to illustrate the application of the method of the utility model. Different sludge dewatering processes and modes, and monitoring points and methods thereof are basically applicable through corresponding adjustment.

The device flow of the accurate dosing control of the sludge centrifugal dehydration of the embodiment is as follows:

the screw pump pumps the sludge into the dehydrator from the sludge storage tank or the sludge concentration tank, the sludge is monitored by the electromagnetic flowmeter and the pipeline type sludge microwave transmitter in the conveying process, after the sludge is dehydrated by the dehydrator, the sludge enters the sludge storage tank for temporary storage, and the temporary stored sludge is pumped into the transport vehicle for external transportation for disposal or enters the next working section through the sludge pump.

In the embodiment, real-time measurement values of an electromagnetic flowmeter and a pipeline type sludge concentration microwave transmitter are acquired through a PAC (programmable logic controller) or PLC (programmable logic controller) and other control programs, the absolute dry sludge quantity (namely total solid content) passing through in unit time is calculated, and the dosing pump frequency is adjusted in real time according to the set dosing ratio of the dewatering medicine machine, so that the flow rate (displayed by the dosing electromagnetic flowmeter) of the dewatering medicine conveyed by the dewatering medicine machine reaches the corresponding dosing ratio. Simultaneously, the solid content in the filtrate is monitored in real time, when the solid content in the filtrate is smaller than a set value, the frequency of the dosing pump is gradually reduced by fine adjustment, so that the dosing amount of the dewatering agent is reduced, and when the solid content in the filtrate is within the positive and negative deviation of the set value, the fine adjustment of the dosing pump is stopped. When the solid content in the filtrate is larger than the set value, the frequency of the dosing pump is gradually and finely adjusted to increase the dosing amount of the dewatering agent, and when the solid content in the filtrate is within the positive and negative deviation of the set value, the fine adjustment of the dosing pump is stopped. Meanwhile, the dosing electromagnetic flowmeter performs accumulated metering on the passing dehydrated medicament.

The present embodiment should be noted that:

1. the adding proportion of the dewatering agent is determined according to the solid content of the sludge measured by a pipeline type sludge concentration microwave transmitter.

2. When the sludge concentration changes within a certain range, the adding proportion of the dewatering agent is determined, and the adding amount is finely adjusted through the solid content in the filtrate measured by the low solid content measuring instrument. At this time, the dosing pump is adjusted based on the data measured by the low solids content measuring instrument.

3. When the sludge concentration change exceeds a certain range, the adding proportion of the dewatering agent is regulated in real time, and the agent adding pump is regulated by the data of the pipeline type sludge concentration microwave transmitter. When the solid content in the filtrate needs to be monitored in real time, if the solid content exceeds the limit, the rotating speed of the sludge dewatering machine is correspondingly regulated.

4. The low solid content filtrate measuring instrument can measure the air index carried in the filtrate, and the index has an indication effect on excessive addition of the dehydration medicament, and can further control and regulate the addition of the dehydration medicament.

5. The matched program has the function of being linked with the screw pump, when the screw pump stops running, the program controls the dosing pump to stop running, and when the screw pump starts, the program also responds simultaneously.

The various data collection and calculation of this embodiment are automated by a computer PAC or PLC.

The device for controlling the accurate dosing of the sludge centrifugal dehydration of the embodiment is mainly used for municipal sewage treatment plants but not limited to municipal sewage treatment plants, and can be also suitable for controlling the accurate dosing of the sludge centrifugal dehydration of regenerated water plants, water purification plants, industrial wastewater treatment plants and the like.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims

1. The utility model provides a device of accurate dosing control of mud centrifugal dehydration which characterized in that: comprises a mud storage tank or a mud concentration tank (1), a centrifugal dehydrator (5), a mud hopper (6) and a medicine dissolving tank (7);

a screw pump (2) is arranged between the centrifugal dehydrator (5) and the sludge storage tank or the sludge concentration tank (1), and an electromagnetic flowmeter (3) and a pipeline type sludge concentration microwave transmitter (4) are arranged between the screw pump (2) and the centrifugal dehydrator (5);

a dosing pump (8) and a dosing electromagnetic flowmeter (9) are arranged between the medicine dissolving tank (7) and the centrifugal dehydrator (5);

the sludge hopper (6) is connected with the centrifugal dehydrator (5).

2. The device for precisely dosing control of sludge centrifugal dehydration according to claim 1, which is characterized by further comprising a filtrate low solids content measuring instrument (12);

a sampling tube (10) and a water return tube (11) are arranged between the filtrate low-solid content measuring instrument (12) and the centrifugal dehydrator (5).

3. The device for precisely dosing and controlling the centrifugal dehydration of the sludge according to claim 1, wherein the pipeline type sludge concentration microwave transmitter (4) is arranged between the electromagnetic flowmeter (3) and the centrifugal dehydrator (5).

4. The device for precisely dosing and controlling the centrifugal dehydration of sludge according to claim 1, wherein the dosing electromagnetic flowmeter (9) is arranged between a dosing pump (8) and a centrifugal dehydrator (5).

5. The device for precisely dosing and controlling the centrifugal dehydration of sludge according to claim 1, wherein the dosing pump (8) is a variable frequency pump and is mainly used for conveying a dehydration drug machine to a sludge inlet pipeline at the front end of the centrifugal dehydrator.

6. The device for precisely controlling the dosing of the centrifugal dehydration of the sludge according to claim 1, wherein the data acquisition and calculation are controlled by a computer PAC or PLC automatic program.

7. The device for precisely controlling the dosing of the centrifugal dewatering of the sludge according to claim 6, wherein the program control has a function of being linked with the screw pump (2), and when the screw pump stops running, the program control stops running and when the screw pump starts, the program also responds.