CN115637757B - A cascade utilization technology for water resources in thermal power plants - Google Patents
A cascade utilization technology for water resources in thermal power plantsInfo
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- CN115637757B CN115637757B CN202211262886.8A CN202211262886A CN115637757B CN 115637757 B CN115637757 B CN 115637757B CN 202211262886 A CN202211262886 A CN 202211262886A CN 115637757 B CN115637757 B CN 115637757B
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Abstract
The invention discloses a cascade utilization process of water resources of a thermal power plant, which divides the water resources into industrial water, living water and reuse water, wherein the living water is the living water in the power plant, the industrial water is fire-fighting water, water for chemical water treatment, boiler system water and oil system water in the power plant, the reuse water is coal yard water and desulfurization process water system water, the industrial water and the living water are connected with tap water pipes, tap water is used for providing water sources for the industrial water and the living water, and the industrial wastewater after the industrial water is treated by a wastewater treatment system is used for extracting the water sources for reuse.
Description
Technical Field
The invention relates to the technical field of water treatment of thermal power plants, in particular to a gradient utilization process of water resources of a thermal power plant.
Background
At present, the shortage of water resources in China is becoming serious, and in local serious water shortage areas, water becomes an important factor for restricting industrial development. The thermal power plant is a large household of industrial water, and the water consumption of the heat supply unit is larger than that of the pure condensation thermal power plant, so that the water saving, reasonable water consumption and enhanced water consumption management are realized, the water resource is fully utilized, and the method has important economic and social significance for enterprises.
At present, when the water balance of a domestic thermal power plant or a thermal power plant is designed, the cascade utilization of water resources is not fully considered, the independent operation of each unit of the power plant is single in water consumption mode, and a mode of once utilization and waste after use is generally adopted, so that a plurality of problems are caused, namely, firstly, various waste water amounts of the whole plant are large, secondly, waste water is mixed together, classification and recycling are difficult, and thirdly, the raw water consumption of the whole plant is large.
Disclosure of Invention
The invention aims to provide a gradient utilization process of water resources of a thermal power plant so as to solve the problems in the background technology.
In order to achieve the aim, the invention provides the technical scheme that the water resource cascade utilization process of the thermal power plant divides the water resource into industrial water, living water and reuse water;
The domestic water is domestic water in a power plant, the industrial water is fire-fighting water, chemical water treatment water, boiler system water and the like in the power plant, and the reuse water is coal yard water and desulfurization process water system water;
the industrial water and the domestic water are connected with a tap water pipe, tap water provides water sources for the industrial water and the domestic water, and the industrial wastewater after the industrial water is used is treated by a wastewater treatment system to be a reuse water supply source.
Further, the system also comprises a mechanical ventilation cooling tower system in the power plant, wherein water used by the mechanical ventilation cooling tower system is derived from one or two of industrial water and reuse water, and the sewage of the mechanical ventilation cooling tower system is treated by the wastewater treatment system to provide a water supply source for reuse water.
Further, the chemical water treatment water comprises normal water vapor loss, external heat supply water, closed cooling water of each auxiliary machine, reverse osmosis self-water, filter self-water and ultrafiltration self-water, wherein the reverse osmosis self-water, filter self-water and ultrafiltration self-water are supplemented into the multiplexing water after the wastewater generated by the wastewater treatment system is treated.
Further, the wastewater treatment system comprises a multi-medium filter, an ultrafiltration wastewater tank, a second wastewater tank, a third wastewater tank and wastewater treatment equipment, wherein the first wastewater tank, the second wastewater tank and the third wastewater tank are used for classifying and recycling wastewater, water after various wastewater treatment by the wastewater treatment equipment is used as a source of multiplexing water, the ultrafiltration wastewater tank is used for recycling backwash drainage of the filter and ultrafiltration, and the backwash drainage is used for providing a water source for industrial water after being filtered and treated by the multi-medium filter.
Further, the boiler system water is demineralized water produced by chemical water treatment, the wastewater after the boiler constant-discharge cooling water is collected by a unit drainage tank, the water quality is directly used as a water source of industrial water in an index, and the wastewater after the treatment of the wastewater treatment system with the super index is used as a water source of reuse water.
Further, the wastewater generated after the oil system water is used enters a third wastewater tank and is treated by wastewater treatment equipment to be used as a water source of the reuse water, and the industrial water also comprises other miscellaneous and unforeseen water.
Further, the water for the coal yard comprises water for hydraulic cleaning, water for coal conveying equipment, water for car washing, water for dust removal, water for factory management flushing and water for coal yard spraying, and the sewage of the water for hydraulic cleaning, the water for coal conveying equipment and the water for car washing is reused as a source of multiplexing water after the sewage is subjected to coal removal treatment.
Furthermore, the water source of the desulfurization process water system is from concentrated water formed after the wastewater treatment system, the desulfurization wastewater system generated after the use of the desulfurization system is treated by adding chemicals, and after heavy metals and suspended matters are removed, the desulfurization process water system is used for spraying in coal yards or enters an electrolytic seawater chlorine production system for chlorine production and is used for sterilizing and algae removal of the circulating water system.
Furthermore, the domestic sewage generated after the domestic water is used is treated by the sewage treatment equipment and then enters the reclaimed water tank for collection, the reclaimed water is used as a source of greening water, the reclaimed water is also used for flushing a toilet in a power plant, and the sewage after flushing enters the reclaimed water tank for collection.
Compared with the prior art, the invention has the beneficial effects that:
aiming at the problems that the types of wastewater are more and the quantity of wastewater is larger and various types of wastewater are not classified and recycled according to the water quality condition, the invention provides a technical scheme for cascade utilization of water resources, the classification and the cascade utilization are carried out according to the water source and the water quality condition of the wastewater, and the classification and the cascade utilization are carried out according to the water quality requirements of each process condition and each water consumption point of a thermal power plant or a thermal power plant, and the original system equipment of the thermal power plant is fully utilized, so that the cost is lower and the treatment difficulty is lower, the water resources are fully utilized, the production water consumption of the power plant is greatly reduced, and the economic benefit and the social benefit are better.
Drawings
Fig. 1 is a schematic flow chart of a cascade utilization process of water resources in a thermal power plant.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in figure 1, the water resource cascade utilization process of the thermal power plant divides water resources into industrial water, living water and reuse water, wherein the living water is living water in the power plant, the industrial water is fire-fighting water in the power plant, water for chemical water treatment, water for a boiler system and the like, the reuse water is coal yard water and water for a desulfurization process water system, the industrial water and the living water are connected with tap water pipes, tap water provides water sources for the industrial water and the reuse water is used as a water supply source after the industrial wastewater is treated by a wastewater treatment system.
The water resource utilization process also comprises a mechanical ventilation cooling tower system in the power plant, wherein water used by the mechanical ventilation cooling tower system is derived from one or two of industrial water and multiplex water, and the sewage of the mechanical ventilation cooling tower system is treated by a wastewater treatment system to be a multiplexing water extraction water supply source, and the water used by the mechanical ventilation cooling tower system comprises auxiliary machine cooling water, air conditioning equipment cooling water and cooling tower water, and part of the water is consumed by wind blowing and evaporation after the water is used.
The water quality control index of the mechanical ventilation cooling tower system is shown in the following table, and when the water quality exceeds the following index, the water quality control index range is achieved by increasing the water supplementing capacity of the mechanical ventilation cooling tower system.
The chemical water treatment water comprises normal water vapor loss, external heat supply water, closed cooling water of each auxiliary machine, reverse osmosis self-water, filter self-water and ultrafiltration self-water, wherein the reverse osmosis self-water, the filter self-water and the wastewater generated by the ultrafiltration self-water are supplemented into the multiplexing water after being treated by the wastewater treatment system.
The wastewater treatment system comprises a multi-medium filter, an ultrafiltration wastewater tank, a first wastewater tank, a second wastewater tank, a third wastewater tank and wastewater treatment equipment, wherein the first wastewater tank, the second wastewater tank and the third wastewater tank are used for classifying and recycling wastewater, water treated by various wastewater treatment equipment is used as a source of reuse water, the ultrafiltration wastewater tank is used for recycling backwash drainage of the filter and ultrafiltration, and the backwash drainage is used for providing a water source for industrial water after being filtered by the multi-medium filter;
The sewage of the cooling tower, the reuse water after being treated by the coal-containing wastewater system, the wastewater of the unit drainage tank and the ultrafiltration reverse osmosis chemical cleaning wastewater all enter into a third wastewater pond to be collected, the reverse osmosis flushing drainage enters into a first wastewater pond to be collected, and the backwash wastewater of the multi-medium filter enters into a second wastewater pond to be collected.
The water used by the boiler system is desalted water prepared by chemical water treatment, after the wastewater after the boiler is used for discharging cooling water in a fixed way is collected by a unit drainage tank, the water quality is directly used as a water source of industrial water in the following indexes, and the wastewater after being treated by a wastewater treatment system exceeding the following indexes is used as a water source of reuse water;
| Sequence number | Project | Unit (B) | Control value |
| 1 | PH | / | 6.5~8.5 |
| 2 | Turbidity degree | NTU | ≤5 |
| 3 | Iron (Fe) | μg/L | ≤300 |
| 4 | Suspension of | mg/L | ≤30 |
| 5 | Chloride ions | mg/L | ≤250 |
| 6 | Hardness of | mmol/L | ≤4.5 |
| 7 | Alkalinity (basicity) | mmol/L | ≤3.5 |
| 8 | COD | mg/L | ≤3 |
The waste water generated after the oil system water is used enters a third waste water tank and is treated by waste water treatment equipment to be used as a water source of the multiplexing water, and the industrial water also comprises other miscellaneous and unforeseen water.
The water for coal yard comprises water for hydraulic cleaning, water for coal conveying equipment, water for car washing machine, water for dust removal, water for factory management flushing and water for coal yard spraying, and the sewage of the water for hydraulic cleaning, the water for coal conveying equipment and the water for car washing machine is reused as a source of the multiplexing water after being subjected to coal removal treatment.
The water source of the desulfurization process water system is from concentrated water formed after passing through the wastewater treatment system, the desulfurization wastewater system generated after the use of the desulfurization system is subjected to dosing treatment, and after heavy metals and suspended matters are removed, the desulfurization process water system is used for spraying in a coal yard or entering an electrolytic seawater chlorine production system for chlorine production and is used for sterilizing and algae removal of the circulating water system. ;
The concentrated water reverse osmosis concentrated water is used as desulfurization process water, so that the water supplementing amount of circulating water is greatly reduced, and the water supplementing amount of a desulfurization tower is indirectly reduced.
Domestic sewage generated after the domestic water is used is treated by sewage treatment equipment and then enters a reclaimed water tank for collection, the reclaimed water is used as a source of greening water, the reclaimed water is also used for flushing a toilet in a power plant, and the flushed sewage enters the reclaimed water tank for collection;
the water for flushing the toilet in the whole factory is changed into the multiplexing water, so that the drainage of each unit is secondarily utilized to flush with low water quality requirement.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (3)
1. A cascade utilization process of water resources of a thermal power plant is characterized in that the water resources are divided into industrial water, living water and reuse water;
The domestic water is domestic water in a power plant, the industrial water is fire-fighting water, chemical water treatment water, boiler system water and oil system water in the power plant, and the reuse water is coal yard water and desulfurization process water system water;
the industrial water and the domestic water are connected with a tap water pipe, tap water is used for providing water sources for the industrial water and the domestic water, and the industrial wastewater after the industrial water is used is treated by a wastewater treatment system to be a reuse water supply source;
The system comprises a wastewater treatment system, a mechanical ventilation cooling tower system, a water treatment system and a water treatment system, wherein the wastewater of the mechanical ventilation cooling tower system is derived from one or two of industrial water and multiplex water, the wastewater of the mechanical ventilation cooling tower system is treated by the wastewater treatment system and is used as a multiplexing water supply source, the chemical water treatment water comprises normal water vapor loss, external heating water, closed cooling water of each auxiliary machine, reverse osmosis self-water, filter self-water and ultrafiltration self-water, wherein the reverse osmosis self-water, the filter self-water and the ultrafiltration self-water are used as sources of multiplexing water, and the wastewater generated by the reverse osmosis self-water, the filter self-water and the ultrafiltration self-water is supplemented into the multiplex water after being treated by the wastewater treatment system;
The boiler constant-drainage cooling water is derived from industrial water, boiler system water is derived from desalted water produced by chemical water treatment, waste water after boiler constant-drainage cooling water is collected through a unit drainage tank, water quality is directly used as a water source of the industrial water in a certain index, waste water exceeding the index is treated by a waste water treatment system and is used as a water source of reuse water, waste water generated after oil system water is used enters a third waste water pond and is treated by waste water treatment equipment and is used as a water source of reuse water, the industrial water also comprises other miscellaneous water and unforeseen water, coal yard water comprises hydraulic cleaning water, coal conveying equipment water, car washer water, dust removing water, plant road flushing water and coal yard spraying water, and the waste water of the hydraulic cleaning water, the coal conveying equipment water and car washer water is reused as a source of reuse water after the water is subjected to the removal treatment.
2. The gradient utilization process of water resources of a thermal power plant according to claim 1, wherein the water source of the desulfurization process water system is from concentrated water formed after passing through a wastewater treatment system, the desulfurization wastewater system generated after the use of the desulfurization system is subjected to chemical adding treatment, heavy metals and suspended matters are removed, and the desulfurization wastewater system is sprayed on a coal yard or enters an electrolytic seawater chlorine production system to produce chlorine for sterilizing and algae removal of a circulating water system.
3. The gradient utilization process of water resources of a thermal power plant according to claim 1, wherein the domestic sewage generated after the domestic water is used is treated by sewage treatment equipment and then enters a reclaimed water tank for collection, the reclaimed water is used as a source of greening water, the reclaimed water is also used for flushing a toilet in the power plant, and the sewage after flushing enters the reclaimed water tank for collection.
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| CN116835806A (en) * | 2023-07-25 | 2023-10-03 | 福建省福能晋南热电有限公司 | Full-automatic operation demineralized water system with high recovery rate |
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| CN103853137A (en) * | 2014-02-19 | 2014-06-11 | 中国能源建设集团广东省电力设计研究院 | Full-digitalized monitoring method for water for power plants and self-balance water affair system |
| CN205662392U (en) * | 2016-05-30 | 2016-10-26 | 中国电力工程顾问集团华北电力设计院有限公司 | Recycling system is handled to meticulous matter of dividing of thermal power plant's waste water |
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| US9199861B2 (en) * | 2013-02-07 | 2015-12-01 | Heartland Technology Partners Llc | Wastewater processing systems for power plants and other industrial sources |
| CN203486995U (en) * | 2013-08-23 | 2014-03-19 | 中机国能电力工程有限公司 | Waste water treatment system for thermal power plant |
| CN209281233U (en) * | 2018-11-02 | 2019-08-20 | 河北涿州京源热电有限责任公司 | A kind of thermal power plant plumbing network system |
| CN109761410A (en) * | 2019-03-28 | 2019-05-17 | 华润电力（沧州运东）有限公司 | Method and system for recycling wastewater from power plant |
| CN212024973U (en) * | 2020-03-30 | 2020-11-27 | 山东电力工程咨询院有限公司 | Sustainable water supply and drainage system of power plant |
| CN211971953U (en) * | 2020-04-03 | 2020-11-20 | 神木市东风金属镁有限公司 | Energy-saving and environment-friendly system for recycling waste water of power plant |
| CN113385036A (en) * | 2021-07-23 | 2021-09-14 | 西安热工研究院有限公司 | Classified recovery device and method for ultrafiltration drainage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103853137A (en) * | 2014-02-19 | 2014-06-11 | 中国能源建设集团广东省电力设计研究院 | Full-digitalized monitoring method for water for power plants and self-balance water affair system |
| CN205662392U (en) * | 2016-05-30 | 2016-10-26 | 中国电力工程顾问集团华北电力设计院有限公司 | Recycling system is handled to meticulous matter of dividing of thermal power plant's waste water |
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