CN115745323A - Thermal power plant circulating cooling water microorganism control system and operation method - Google Patents
Thermal power plant circulating cooling water microorganism control system and operation method Download PDFInfo
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- CN115745323A CN115745323A CN202211587895.4A CN202211587895A CN115745323A CN 115745323 A CN115745323 A CN 115745323A CN 202211587895 A CN202211587895 A CN 202211587895A CN 115745323 A CN115745323 A CN 115745323A
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- 244000005700 microbiome Species 0.000 title claims abstract description 29
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- 239000005708 Sodium hypochlorite Substances 0.000 claims description 7
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 7
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Abstract
The invention relates to a microbial control system and an operation method for circulating cooling water of a thermal power plant, which comprises the following steps: an ultraviolet sterilization system, a microorganism monitoring system and a pipeline dosing system; the ultraviolet sterilization system is connected with the pipeline dosing system, and one end of the pipeline dosing system, which is far away from the ultraviolet sterilization system, is also connected with the circulating pump; microorganism monitoring system is including setting up the first bacterial colony check point before ultraviolet sterilization system, sets up second bacterial colony check point and the third bacterial colony check point of setting behind the circulating pump between ultraviolet sterilization system and pipeline medicine system. The invention has the beneficial effects that: the chemical adding system can automatically adjust the chemical adding amount of the bactericide according to the water inlet and the ultraviolet sterilization effect, can be suitable for supplementing circulating cooling water of different types and different water qualities, can deal with the water quality fluctuation change in the long-term continuous treatment process, and avoids the chemical adding excessive amount to the maximum extent.
Description
Technical Field
The invention relates to the technical field of environment-friendly water treatment, in particular to a microbial control system for circulating cooling water of a thermal power plant and an operation method.
Background
The steam after working is cooled into condensed water by cooling water in the condenser for recycling, the cooling water absorbs heat and is heated in the process, and a circulating cooling water system is arranged for recycling the cooling water, and the circulating cooling water system is divided into a split type and a closed type. Among them, the circulating cooling water of open system is exposed to air, the pollutants in the water are concentrated in the system, and the system needs make-up water (usually seawater, river water or urban water), and is the most widely used circulating cooling water system. The circulating cooling water system of the thermal power plant is an indispensable key system for maintaining the normal operation of the power plant, and the normal operation of the system is a powerful guarantee for power production.
Open circulating cooling water systems often suffer from microbial contamination due to the growth of a large number of microorganisms. The raw water and the make-up water are main sources of microorganisms, determine the types and the number of the microorganisms in the circulating cooling water, and have certain influence on the microorganisms in the air and the precipitation. The microorganisms in the circulating water system mainly comprise chemical bacteria (slime forming bacteria, iron bacteria, sulfate reducing bacteria, acid-producing bacteria and the like), fungi (yeasts and molds) and algae (blue algae, green algae, diatoms and the like). The proliferation of microorganisms on the metal surface and the electrochemical process and the scaling process are mutually promoted, so that the heat transfer coefficient of equipment is reduced, the flow resistance is increased, the service life is shortened, and the operation and maintenance problems of the circulating cooling water system are solved.
In order to solve the problem of microbial contamination, the mainstream technology controls the microbial propagation by adding a bactericide. The common bactericides comprise active chlorine, ozone, chlorine dioxide, chlorinated isocyanuric acid, bromide and non-oxidation bactericides (comprising chlorophenol, quaternary ammonium salt, isothiazolinone and the like), and most bactericides can be remained in circulating water at a certain concentration and have a continuous bactericidal effect. The dosage method requires large amount of medicament and high cost of medicament production, and the added medicament directly enters external water without degradation, thus causing great burden to the environment. In addition, a microorganism control method adopting ultraviolet sterilization can effectively kill microorganisms in overflowing water of ultraviolet equipment, but cannot act on water and equipment which are not irradiated by ultraviolet, so that long-period control of the microorganisms is not facilitated.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a circulating cooling water microorganism control system and an operation method for a thermal power plant.
In a first aspect, a microbiological control system for recirculated cooling water of a thermal power plant is provided, which includes: an ultraviolet sterilization system, a microorganism monitoring system and a pipeline dosing system;
the ultraviolet sterilization system is connected with the pipeline dosing system, and one end of the pipeline dosing system, which is far away from the ultraviolet sterilization system, is also connected with the circulating pump; the microorganism monitoring system comprises a first bacterial colony detection point arranged in front of the ultraviolet sterilization system, a second bacterial colony detection point arranged between the ultraviolet sterilization system and the pipeline dosing system and a third bacterial colony detection point arranged behind the circulating pump.
Preferably, the ultraviolet sterilization system is a low-pressure ultraviolet sterilization system or a medium-pressure ultraviolet sterilization system; the low-pressure ultraviolet sterilization system is provided with N open channels, each open channel is internally provided with 1 ultraviolet module group, and each ultraviolet module group is internally provided with a plurality of low-pressure ultraviolet lamps; the medium-pressure ultraviolet sterilization system comprises N sets of medium-pressure ultraviolet equipment arranged in a closed mother pipe.
Preferably, the pipeline dosing system comprises a dosing tank, a dosing pump and a control system; the dosing pump is respectively connected with the dosing box and the control system.
In a second aspect, there is provided a method for operating a microbial control system for recirculated cooling water of a thermal power plant as described in the first aspect, comprising:
s1, enabling incoming water to flow through an ultraviolet sterilization system, and performing sterilization treatment on the incoming water by the ultraviolet sterilization system;
s2, acquiring the total number of colonies at the first colony detection point and the total number of colonies at the second colony detection point, and evaluating the sterilization performance of the ultraviolet sterilization system;
s3, acquiring the corresponding relation between the total number of the colonies at the second colony detection point and the dosing concentration, and determining the dosing concentration according to the total number of the colonies at the second colony detection point and the corresponding relation;
s4, the pipeline dosing system carries out dosing and sterilization treatment on incoming water flowing out of the ultraviolet sterilization system to obtain circulating cooling water supplement water, wherein the dosing concentration of the circulating cooling water supplement water is the dosing concentration determined in the S3;
s5, enabling the circulating cooling water replenishing water to flow through a circulating pump to obtain circulating water replenishing water;
and S6, acquiring the total number of the colonies at the third colony detection point, and evaluating the control effect of the whole microorganism.
Preferably, in S2 and S6, the total number of colonies in the first colony detection point, the second colony detection point, and the third colony detection point is set to a high value alarm.
Preferably, in S4, the control system in the pipeline dosing system can automatically adjust the operation cycle of the dosing pump according to the feedback of the total number of colonies at the second colony detection point.
Preferably, in S4, the time length of each time the dosing pump is started and the dosing concentration are fixed, the average colony number of the second colony detection points in 24 continuous hours is lower than a set value, the operation period is prolonged, and the operation period is shortened when the average colony number of the second colony detection points in 24 continuous hours is higher than the set value.
Preferably, in S4, the liquid level of the dosing tank in the pipeline dosing system is provided with low-value and high-value alarms.
Preferably, in S4, the chemical agent in the chemical adding box includes any one of a sodium hypochlorite solution, a chlorine dioxide solution, a quaternary ammonium salt solution and an isothiazolinone solution.
Preferably, in S1, the ultraviolet sterilization system is in a normally open mode and always operates at the maximum rated power.
The invention has the beneficial effects that:
1. the invention is provided with the ultraviolet sterilization system, ensures the water replenishing and sterilization effects of the circulating cooling water, reduces the usage amount of the bactericide, reduces the operation cost and has obvious environmental benefit.
2. The invention maintains the dosing system to be normally open, can deeply kill microorganisms which can not be thoroughly killed by ultraviolet rays on one hand, and can ensure that the circulating cooling water system is always under the continuous protection of the bactericide on the other hand, thereby improving the control effect of microbial pollution.
3. The chemical adding system can automatically adjust the chemical adding amount of the bactericide according to the water inlet and the ultraviolet sterilization effect, can be suitable for supplementing circulating cooling water of different types and different water qualities, can deal with water quality fluctuation changes in the long-term continuous treatment process, and avoids excessive chemical adding amount to the maximum extent.
4. The invention is safe, reliable and easy to maintain, can be used as a new system for complete application, and can also be upgraded and reformed on the basis of an old system.
Drawings
FIG. 1 is a schematic structural diagram of a microbial control system for recirculated cooling water of a thermal power plant according to the present disclosure;
FIG. 2 is a schematic diagram of a pipeline medicating system provided herein;
fig. 3 is a flowchart of an operation method of a thermal power plant recirculated cooling water microorganism control system.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to provide an understanding of the invention. It should be noted that, for a person skilled in the art, several modifications can be made to the invention without departing from the principle of the invention, and these modifications and modifications also fall within the protection scope of the claims of the present invention.
Example 1:
as shown in fig. 1, the application provides a thermal power plant recirculated cooling water microbial control system, coupling medicament and ultraviolet ray participate in the microbial killing jointly, can utilize the medicament to compensate the shortcoming that ultraviolet sterilization can not long-term effect to utilize ultraviolet sterilization to reduce the dosage, in order to realize thermal power plant recirculated cooling system's safe and stable operation, this system includes: an ultraviolet sterilization system, a microorganism monitoring system and a pipeline dosing system; in addition, the device also comprises a meter, a pipeline, a valve and the like which are matched.
The ultraviolet sterilization system is connected with the pipeline dosing system, and one end of the pipeline dosing system, which is far away from the ultraviolet sterilization system, is also connected with the circulating pump; the microorganism monitoring system comprises a first bacterial colony detection point arranged in front of the ultraviolet sterilization system, a second bacterial colony detection point arranged between the ultraviolet sterilization system and the pipeline dosing system and a third bacterial colony detection point arranged behind the circulating pump. The data of the first colony detection point is the total number of colonies in the incoming water and is mainly used for ultraviolet sterilization effect performance evaluation; the data of the second bacterial colony detection point is the total number of the residual bacterial colonies after ultraviolet sterilization, and the second bacterial colony detection point can be used for evaluating the performance of the ultraviolet sterilization effect and also provides a basis for the operation of an automatic pipeline dosing system; the data of the third colony detection point is the total number of colonies in the circulating cooling water and is used for evaluating the overall microbial control effect of the system. The detection index is the total number of colonies.
The ultraviolet sterilization system is a low-pressure ultraviolet sterilization system or a medium-pressure ultraviolet sterilization system; the low-pressure ultraviolet sterilization system is provided with N (N is a natural number more than 0) open channels, each open channel is internally provided with 1 ultraviolet module group, and each ultraviolet module group is internally provided with a plurality of low-pressure ultraviolet lamps; the medium-pressure ultraviolet sterilization system comprises N sets of (N is a natural number more than 0) medium-pressure ultraviolet equipment arranged in a closed mother pipe.
The pipeline dosing system is shown in figure 2 and comprises a dosing tank, a dosing pump and a control system; the dosing pump is respectively connected with the dosing tank and the control system.
Example 2:
an operation method of a microorganism control system for circulating cooling water of a thermal power plant comprises the following steps:
s1, enabling the incoming water to flow through an ultraviolet sterilization system, and performing sterilization treatment on the incoming water by the ultraviolet sterilization system to kill microorganisms in the water as much as possible.
In S1, the ultraviolet sterilization system is in a normally open mode and always works at the maximum rated power
S2, acquiring the total number of the colonies at the first colony detection point and the total number of the colonies at the second colony detection point, and evaluating the sterilization performance of the ultraviolet sterilization system.
The detection mode of the total number of the bacterial colonies is not limited in the application, and the detection mode can be automatic on-line monitoring of the total number of the bacterial colonies, and can also be manual sampling detection at regular intervals. The data obtained by detection is uploaded to a remote end and can be called and analyzed by a pipeline dosing system.
And S3, acquiring the corresponding relation between the total number of the bacterial colonies at the second bacterial colony detection point and the dosing concentration, and determining the dosing concentration according to the total number of the bacterial colonies at the second bacterial colony detection point and the corresponding relation, namely the dosing concentration in the circulating cooling water replenishing water.
For example, when the chemical agent in the dosing system is sodium hypochlorite, the 24-hour average total number of colonies at the second colony detection point is shown in table 1 as the correspondence relationship with the dosing concentration.
TABLE 1
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
| Total number of Colonies (CFU) | Less than 100 | 500 | 1000 | 2000 | 5000 | 10000 | 20000 | 50000 |
| Adding medicine concentration (mg/L) | 0.5 | 0.5 | 0.5 | 1.0 | 1.0 | 1.5 | 2.0 | 2.5 |
And S4, the pipeline dosing system carries out dosing and sterilization treatment on the incoming water flowing out of the ultraviolet sterilization system to obtain circulating cooling water for supplementing water.
And S4, the control system in the pipeline dosing system can automatically adjust the operating cycle of the dosing pump according to the feedback of the total number of the bacterial colonies of the second bacterial colony detection point. Illustratively, the dosing pump is fixed for each on period (e.g., 15 minutes) and dosing concentration (e.g., 10% sodium hypochlorite), the average total number of colonies detected at the second colony spot for 24 hours is below a set value (e.g., 100 CFU/mL), the run period is extended (e.g., from 0.5 days to 1 day), and the run period is shortened (e.g., from 1 day to 0.5 days) when the average total number of colonies detected at the second colony spot for 24 hours is above the set value (e.g., 100 CFU/mL).
In addition, the liquid level of a dosing tank in the pipeline dosing system is provided with low-value and high-value alarms. The medicament in the medicine adding box comprises any one of a sodium hypochlorite solution, a chlorine dioxide solution, a quaternary ammonium salt solution, an isothiazolinone solution or other bactericide solution.
And S5, circulating cooling water replenishing water flows through a circulating pump to obtain circulating water replenishing water.
And S6, acquiring the total number of the colonies at the third colony detection point, and evaluating the control effect of the whole microorganism.
In addition, in S2 and S6, the total number of colonies of the first colony detection point, the second colony detection point and the third colony detection point is respectively set with a high value alarm. The total number of expected colonies at the third colony detection point is 500CFU/mL or less.
Example 3:
a circulating cooling water system of a certain inland thermal power plant is an open system, urban reclaimed water is used as replenishing water of circulating cooling water, and the total number of replenished bacterial colonies fluctuates within the range of 100-35000 CFU/mL. The prior art adopts a mode of adding 10 percent (mass fraction) of sodium hypochlorite solution in an impact mode to carry out microbial control on circulating cooling water. The dosing frequency is fixed, the dosing quantity is not adjusted according to the water quality of the incoming water, and the problems of large usage amount of the bactericide and high medicament cost exist. In summer, the breeding speed of microorganisms is high, and the normal operation of the circulating cooling water system is influenced by the condition that a large amount of biological slime is attached to equipment for many times.
The original microbial control system is modified, a set of low-pressure ultraviolet sterilization device is arranged, manual sampling points are arranged in the front and at the back of the ultraviolet sterilization system and at the outlet of the circulating pump, and the original dosing system is modified. Each circulating water system is additionally provided with 1 set of low-pressure ultraviolet sterilizing devices, each set of system comprises 80 ultraviolet lamps of 320W in total of 5 ultraviolet sterilizing modules, the ultraviolet lamps are arranged in 5 sterilizing open channels, and each open channel is internally provided with 1 module group and is matched with a corresponding automatic cleaning, driving and controlling system. The ultraviolet system is designed for outdoor all-weather installation and operation, and the design water treatment amount is 20000 tons/day. Samples were taken from 3 sampling points each week, analyzed for colony counts in the laboratory, and the results were uploaded. The medicine system is with the mode control germicide concentration in the recirculated cooling water of impact addition 10% sodium hypochlorite solution, can be according to the colony total number of ultraviolet device export, the automatic adjustment adds the medicine pump operating cycle to this adjustment germicide addition. The condition is good during the continuous operation of the system after transformation, the lamp tube of the ultraviolet sterilization system is replaced for 1 time due to the expiration of the service life, the dosing quantity is reduced to the original 30 percent, and the total number of the bacterial colonies in the circulating cooling water is always kept below 100 CFU/mL.
The novel circulating water microbial control system modified by the thermal power plant is normally put into operation for 3 years, the microbial control condition is good, and the large-scale proliferation condition of circulating cooling water and related equipment surface microbes is not generated. The dosage and the dosing cost of the bactericide are greatly reduced, and the bactericide has remarkable economic benefit and environmental benefit. The results show that the circulating water microorganism control system and the operation method of the thermal power plant have good applicability.
In conclusion, the coupling agent and the ultraviolet rays jointly participate in microbial killing, the agent can be used for overcoming the defect that ultraviolet sterilization cannot have a long-acting effect, and the dosage is reduced by using ultraviolet sterilization, so that the safe and stable operation of a circulating cooling system of a thermal power plant is realized.
Claims (10)
1. A thermal power plant recirculated cooling water microbiological control system characterized in that includes: an ultraviolet sterilization system, a microorganism monitoring system and a pipeline dosing system;
the ultraviolet sterilization system is connected with the pipeline dosing system, and one end of the pipeline dosing system, which is far away from the ultraviolet sterilization system, is also connected with the circulating pump; the microorganism monitoring system comprises a first bacterial colony detection point arranged in front of the ultraviolet sterilization system, a second bacterial colony detection point arranged between the ultraviolet sterilization system and the pipeline dosing system and a third bacterial colony detection point arranged behind the circulating pump.
2. The microbial control system for the circulating cooling water of the thermal power plant according to claim 1, wherein the ultraviolet sterilization system is a low-pressure ultraviolet sterilization system or a medium-pressure ultraviolet sterilization system; the low-pressure ultraviolet sterilization system is provided with N open channels, each open channel is internally provided with 1 ultraviolet module group, and each ultraviolet module group is internally provided with a plurality of low-pressure ultraviolet lamps; the medium-pressure ultraviolet sterilization system comprises N sets of medium-pressure ultraviolet equipment arranged in a closed mother pipe.
3. The microbial control system for the circulating cooling water of the thermal power plant according to claim 2, wherein the pipeline dosing system comprises a dosing tank, a dosing pump and a control system; the dosing pump is respectively connected with the dosing box and the control system.
4. A method for operating a microbial control system for recirculated cooling water of a thermal power plant as set forth in claim 1, comprising:
s1, enabling incoming water to flow through an ultraviolet sterilization system, and performing sterilization treatment on the incoming water by the ultraviolet sterilization system;
s2, acquiring the total number of colonies at the first colony detection point and the total number of colonies at the second colony detection point, and evaluating the sterilization performance of the ultraviolet sterilization system;
s3, acquiring the corresponding relation between the total number of the colonies at the second colony detection point and the dosing concentration, and determining the dosing concentration according to the total number of the colonies at the second colony detection point and the corresponding relation;
s4, the pipeline dosing system carries out dosing and sterilization treatment on the incoming water flowing out of the ultraviolet sterilization system to obtain circulating cooling water supplement water, wherein the dosing concentration of the circulating cooling water supplement water is the dosing concentration determined in the S3;
s5, enabling the circulating cooling water replenishing water to flow through a circulating pump to obtain circulating water replenishing water;
and S6, acquiring the total number of the colonies at the third colony detection point, and evaluating the control effect of the whole microorganism.
5. The operating method of the microbial control system for recirculated cooling water of a thermal power plant as claimed in claim 4, wherein in S2 and S6, the total number of colonies in the first colony detection point, the second colony detection point and the third colony detection point are respectively set to high value alarm.
6. The operation method of the microbial control system for recirculated cooling water of a thermal power plant as claimed in claim 5, wherein in S4, the control system in the pipeline dosing system is capable of automatically adjusting the operation cycle of the dosing pump according to the feedback of the total number of colonies at the second colony detection point.
7. The operating method of the microbial control system for circulating cooling water in the thermal power plant according to claim 6, wherein in S4, the time length of each time the dosing pump is started and the dosing concentration are fixed, the average colony count at the second colony detection point for 24 continuous hours is lower than a set value, the operating period is prolonged, and the operating period is shortened when the average colony count at the second colony detection point for 24 continuous hours is higher than the set value.
8. The operating method of the microbial control system for circulating cooling water of the thermal power plant according to claim 7, wherein in S4, the liquid level of a dosing tank in the pipeline dosing system is provided with low-value and high-value alarms.
9. The operating method of the microbial control system for recirculated cooling water of a thermal power plant according to claim 8, wherein in S4, the chemical agent in the chemical adding tank includes any one of a sodium hypochlorite solution, a chlorine dioxide solution, a quaternary ammonium salt solution, and an isothiazolinone solution.
10. The operating method of the microbial control system for recirculated cooling water of a thermal power plant of claim 9, wherein in S1, the ultraviolet sterilization system is in a normally-open mode and is always operated at a maximum rated power.
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