Thermal power plant water system and optimization method

Abstract

The invention discloses a thermal power plant water system and an optimization method. Water systems are arranged in the same area in a centralized mode; facilities with the same system attribute in the area are arranged in a centralized manner and are shared; the thermal power plant water system is integrally designed, so that the cost is reduced, resources are saved, and the equipment redundancy is reduced and the construction cost is saved by sharing facilities; after centralized arrangement, the number of operation post personnel is reduced, and the wastewater recycling rate is increased; potential safety hazards are reduced, acid-base storage points are simplified, and the leakage risk is reduced; underground water pools are centrally managed, and water falling accidents are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of water systems in thermal power plants, and more particularly to a water system in a thermal power plant and an optimization method thereof. Background Art

[0002] At present, there are systematic defects in the design and operation of the water system of thermal power plants, which are mainly manifested in the following aspects: Fragmented spatial layout: Duplication and dispersion of facilities. Conventional design of thermal power plants arranges more than ten water systems independently, including water pretreatment, boiler feed water treatment, condensate regeneration, and industrial wastewater treatment. Each system requires dedicated plant buildings, pipelines, and auxiliary facilities, resulting in spatial fragmentation of the plant area.

[0003] Facilities with the same redundant functional units are repeatedly constructed in various systems, forming a large number of "island-style" units with overlapping functions.

[0004] Fragmented process flow: Multi-stage treatment barrier. Industrial wastewater must undergo independent sedimentation, filtration, and disinfection processes; coal-containing wastewater must be separated from coal sludge separately; domestic sewage treatment is a self-contained system. This segmented treatment results in increased energy consumption from multiple water transfers, circuitous and complex reuse paths, interrupted resource circulation, independent discharge of heat energy in each system, and repeated addition of chemical agents in dispersed units, making it impossible to form cross-system synergy.

[0005] Safety hazards abound: Hazardous acid and alkali storage points are scattered throughout the factory area, and leakage risks are distributed at multiple points; underground wastewater pools are scattered around, forming hidden risk areas.

[0006] This traditional model of "decentralized layout and independent operation" has become a structural obstacle restricting the efficient use of water resources and green transformation of thermal power plants. Summary of the Invention

[0007] In view of this, the present invention provides a water system for a thermal power plant and an optimization method thereof, aiming to solve the above-mentioned technical problems.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: A thermal power plant water system includes a water source storage system, a raw water pretreatment system, a boiler feed water treatment system, a condensate polishing and regeneration system, and a wastewater treatment system, which are centrally arranged in the same area and interconnected.

[0009] Preferably, the wastewater treatment system includes a chemical wastewater treatment system, an industrial wastewater treatment system, an oily wastewater treatment system, a coal-containing wastewater treatment system, and a domestic sewage treatment system.

[0010] Preferably, it also includes an acid-base system, a dosing system, a desludging system, a compressed air system, a monitoring system, a laboratory and an electrical distribution room arranged in a centralized area.

[0011] The present invention provides a method for optimizing a water system in a thermal power plant, comprising the following steps: Industrial wastewater from the factory directly enters the raw water reservoir and participates in sedimentation and coagulation treatment together with the raw water; The coal-containing wastewater generated by the coal-fired system is pre-precipitated in a clarifier on site. After precipitation, the clear water directly enters the raw water reservoir and participates in sedimentation and coagulation treatment together with the raw water. The acid and alkaline waste liquid generated by the boiler feed water treatment system and condensate polishing regeneration is fed into the raw water reservoir after the pH value is qualified, and participates in sedimentation and coagulation treatment together with the raw water; After the oily wastewater is qualified for treatment, it enters the raw water reservoir and participates in sedimentation and coagulation treatment together with the raw water; After domestic sewage is treated and qualified, it enters the raw water storage tank and participates in sedimentation and coagulation treatment together with the raw water.

[0012] Preferably, the precipitation and coagulation treatment adopts membrane separation technology, including reverse osmosis membrane or ultrafiltration membrane.

[0013] Preferably, the domestic sewage treatment and oily wastewater treatment adopts biological treatment enhancement technology, including high-efficiency bacterial strains or biofilm reactors.

[0014] Preferably, the oily wastewater treatment includes a three-stage process of demulsification, ultrafiltration and activated carbon adsorption.

[0015] Preferably, the sludge dewatering process includes a combined process of hot alkali pretreatment and plate and frame filter press.

[0016] It can be seen from the above technical solutions that, compared with the prior art, the present invention provides a thermal power plant water system and optimization method, which has the following beneficial effects: This invention reduces costs and conserves resources through the integrated design of thermal power plant water systems. By sharing facilities (such as an acid-base system, control room, and sludge dewatering device), equipment redundancy is reduced, construction costs are saved, and efficiency is improved: after centralized layout, the number of operating personnel is reduced, and the wastewater reuse rate is increased; Reduced safety hazards: single acid and alkali storage points reduce leakage risks; centralized management of underground water pools reduces water-falling accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0018] Figure 1 The accompanying drawing is a schematic diagram of the overall process provided by the present invention; in: 1. Control room; 2. Laboratory; 3. Raw water reservoir; 4. Raw water pretreatment system; 5. Boiler feed water treatment system; 6. Condensate polishing and regeneration system; 7. Chemical dosing system; 8. Chemical wastewater treatment system; 9. Domestic sewage treatment system; 10. Oily sewage treatment system; 11. Sludge dewatering system; 12. Acid and alkali storage; 13. Drug storage; 14. Compressed air station; 15. Power distribution room. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Example 1: See also Figure 1 The embodiment of the present invention discloses a thermal power plant water system, including a raw water reservoir 3, a raw water pretreatment system 4, a boiler feed water treatment system 5, a condensate polishing and regeneration system 6, a chemical wastewater treatment system 8, an industrial wastewater treatment system, an oily wastewater treatment system 10, a coal-containing wastewater treatment system, and a domestic sewage treatment system 9, which are centrally arranged in the same area and interconnected.

[0021] In order to further optimize the above technical solution, it also includes an acid and alkali system, a dosing system, a sludge dewatering system 11, a compressed air system, a monitoring system, a laboratory and an electrical distribution room arranged in a centralized area.

[0022] The water source storage system is the raw water reservoir 3, which is the core hub. It receives: industrial wastewater from the factory area (directly input through pipelines), pre-precipitated clean water of coal-containing wastewater (transported through pipelines), acid and alkali waste liquid (input through pipelines after neutralization), and oily wastewater / domestic sewage (input through pipelines after qualified treatment); it is connected to the pretreatment unit; the raw water pretreatment system receives: water from the raw water reservoir, and outputs: treated water is diverted to: boiler feed water treatment system, condensate regeneration system; shared facilities: membrane separation equipment (replacing traditional sedimentation tanks). The membrane separation equipment is an existing conventional structure and will not be described in detail here.

[0023] Boiler feed water treatment system 5 and condensate regeneration system: share the regeneration reagents of acid and alkali reservoir; waste liquid is output to chemical wastewater treatment and neutralization.

[0024] Wastewater treatment system: Chemical wastewater treatment: Input: acid and alkali waste liquid from boiler feed water / condensate system; Output: qualified water after neutralization to raw water reservoir.

[0025] Oily wastewater and domestic sewage treatment are treated using biofilm reactors, with output: clean water directly connected to the raw water reservoir; Sludge dewatering: Input: sludge generated by all systems (collected through pipelines), Output: dewatered sludge resource utilization.

[0026] Shared facility connections: Acid-base system: Simultaneously supplies through pipelines: regeneration unit for boiler feed water treatment, condensate regeneration system, and neutralization unit for chemical wastewater treatment.

[0027] Energy and monitoring systems: Compressed air station 14: provides pneumatic control power for all water treatment units and integrated power supply with solar photovoltaic panels (dosing pumps are given priority); Control Room 1: Centralized monitoring: leakage alarm of acid and alkali reservoir 12, water tank level, membrane separation operating parameters; data linkage: laboratory water quality test data is fed back to the control strategy in real time; Distribution room 15: provides unified power supply to all water treatment equipment and monitoring systems.

[0028] After the relevant water systems are arranged centrally, the boiler feed water treatment and regeneration system, the condensate polishing and regeneration system, and the wastewater treatment system share a set of acid and alkali systems; there is only one acid and alkali storage in the entire plant; and two sets of facilities can be reduced (including acid and alkali storage tanks, acid and alkali unloading pumps, acid and alkali pipelines, and building facilities with anti-corrosion, ventilation, drainage, insulation, lighting, monitoring and other functions).

[0029] After the relevant water systems are centrally arranged, all water system units share one control room; at least two sets of control rooms and building facilities with anti-corrosion, ventilation, insulation, lighting, monitoring and other functions are reduced.

[0030] After the relevant water systems are centrally arranged, the fine treatment is reduced to setting up a set of self-use desalted water tank (generally with a volume of 200M3).

[0031] After the relevant water systems are centrally arranged, the three wastewater neutralization treatment devices of the boiler feed water treatment system, the condensate polishing and regeneration system, and the centralized wastewater treatment system are reduced to one, and two wastewater tanks, wastewater pumps and related neutralization facilities are eliminated.

[0032] After the relevant water systems are centrally arranged, industrial wastewater will be directly sent to the pretreatment system for treatment, and the industrial wastewater pool, industrial wastewater treatment system equipment and corresponding building facilities will be eliminated.

[0033] After the relevant water systems are centrally arranged, coal-containing wastewater is directly sent to the pretreatment system for treatment, and the coal-containing wastewater treatment equipment and corresponding building facilities are eliminated.

[0034] After the relevant water systems are centrally arranged, domestic sewage and oily sewage are treated and qualified, and the clean water directly enters the raw water reservoir, and there is no need to set up a clean water tank and recycled water pump.

[0035] After the relevant water systems are centrally arranged, only one set of sludge dewatering device is required; one or two sets of sludge concentration and dewatering devices can be saved.

[0036] After the relevant water systems are centrally arranged, process and control gases share one set, which can reduce at least two to four air storage tanks.

[0037] Example 2: The present invention provides a method for optimizing a water system in a thermal power plant, comprising the following steps: Industrial wastewater from the factory directly enters the raw water reservoir and participates in sedimentation and coagulation treatment together with the raw water; The coal-containing wastewater generated by the coal-fired system is pre-precipitated in a clarifier on site. After precipitation, the clear water directly enters the raw water reservoir and participates in sedimentation and coagulation treatment together with the raw water. The acid and alkaline waste liquid generated by the boiler feed water treatment system and condensate polishing regeneration is fed into the raw water reservoir after the pH value is qualified, and participates in sedimentation and coagulation treatment together with the raw water; After the oily wastewater is qualified for treatment, it enters the raw water reservoir and participates in sedimentation and coagulation treatment together with the raw water; After domestic sewage is treated and qualified, it enters the raw water storage tank and participates in sedimentation and coagulation treatment together with the raw water.

[0038] In order to further optimize the above technical solution, the precipitation and coagulation treatment adopts membrane separation technology, including reverse osmosis membrane or ultrafiltration membrane.

[0039] In order to further optimize the above technical solution, the domestic sewage treatment and oily wastewater treatment adopts biological treatment enhancement technology, including high-efficiency bacterial strains or biofilm reactors.

[0040] In this embodiment, membrane separation technology is used to replace the traditional sedimentation process. Membrane separation technology is used to replace the traditional sedimentation process, improve water quality and reduce the use of chemical agents, and is suitable for high-salt wastewater treatment; biological treatment enhancement is used to introduce high-efficiency bacteria or biofilm reactors to treat domestic sewage and oily wastewater and reduce energy consumption.

[0041] In order to further optimize the above technical solution, the oily wastewater treatment includes three-stage processes: demulsification, ultrafiltration and activated carbon adsorption.

[0042] In this embodiment, the demulsifier is sodium dodecylbenzenesulfonate / OP-10 compound (mass ratio 3:1); the ultrafiltration membrane has a molecular weight cutoff of 5000Da; the activated carbon column has a filling capacity of 15kg / m 3 Wastewater.

[0043] In order to further optimize the above technical solution, the sludge dewatering process includes a hot alkali pretreatment and a plate and frame filter press combined process.

[0044] A combined process of hot alkali pretreatment and plate and frame filter pressing was adopted: the sludge was mixed with 4% NaOH solution at a ratio of 1:3 and reacted at 80°C for 30 minutes; the plate and frame filter pressing pressure was maintained at 1.5 MPa, and the pore size of the filter cloth was ≤20 μm.

[0045] After dewatering, the sludge can enter the carbonization furnace (furnace temperature 650±10℃) for treatment to produce biochar for adsorption of organic pollutants in pretreatment.

[0046] This embodiment also includes designing energy recovery and renewable energy integration, including waste heat utilization and solar drive. Among them, waste heat utilization is used to recover waste heat from the water treatment process for preheating boiler feed water or driving a heat pump system. Solar drive is used to install photovoltaic panels in centralized areas to power low-power equipment such as dosing pumps and monitoring systems.

[0047] Comprehensive monitoring and control of pollutants include emerging pollutant monitoring and multi-level safety barriers; among them, the emerging pollutant monitoring is used to increase the detection equipment for emerging pollutants such as microplastics and antibiotic residues, and integrate targeted treatment processes, including activated carbon adsorption and electrochemical degradation; the multi-level safety barrier is used to add ultraviolet disinfection or nanofiltration in the reuse water link to ensure water quality safety.

[0048] Green and low-carbon measures include carbon capture and utilization and sludge resource utilization; among them, carbon capture and utilization is used to capture the CO2 generated during water treatment and use it for pH adjustment or other processes to reduce carbon emissions; the sludge resource utilization is used to convert dewatered sludge into building materials or soil conditioners to achieve "zero waste", among which the carbon capture equipment is an existing conventional structure and will not be described in detail here.

[0049] After the relevant water systems are centrally arranged, the boiler feed water treatment and regeneration system, the condensate polishing and regeneration system, and the wastewater treatment system share a set of acid-base systems; all water system units share a control room; the polishing treatment reduces the need to set up a self-use desalted water tank; the three wastewater neutralization treatment devices of the boiler feed water treatment system, the condensate polishing and regeneration system, and the centralized wastewater treatment system are reduced to one set; industrial wastewater is directly fed into the pretreatment system for treatment, and the industrial wastewater pool, industrial wastewater treatment system equipment and corresponding buildings and facilities are eliminated; coal-containing wastewater is directly fed into the pretreatment system for treatment, and the coal-containing wastewater treatment equipment and corresponding buildings and facilities are eliminated; after domestic sewage and oil-containing sewage are treated and qualified, the clean water directly enters the raw water reservoir, and the clean water pool and recycled water pump are no longer set up; there is only one set of sludge dewatering equipment; and the process and control gas share one set.

[0050] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0051] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A water system for a thermal power plant, characterized in that: It includes a water source storage system, a raw water pretreatment system, a boiler feed water treatment system, a condensate polishing and regeneration system, and a wastewater treatment system, which are centrally arranged in the same area and interconnected.

2. A thermal power plant water system according to claim 1, characterized in that: Wastewater treatment systems include chemical wastewater treatment systems, industrial wastewater treatment systems, oily wastewater treatment systems, coal-containing wastewater treatment systems and domestic sewage treatment systems.

3. A thermal power plant water system according to claim 1, characterized in that: It also includes acid and alkali systems, dosing systems, desludging systems, compressed air systems, monitoring systems, laboratories and electrical distribution rooms arranged in a centralized area.

4. A method for optimizing a water system in a thermal power plant, characterized in that: The following steps are involved: Industrial wastewater from the factory directly enters the raw water reservoir and participates in sedimentation and coagulation treatment together with the raw water; The coal-containing wastewater generated by the coal-fired system is pre-precipitated in a clarifier on site. After precipitation, the clear water directly enters the raw water reservoir and participates in sedimentation and coagulation treatment together with the raw water. The acid and alkaline waste liquid generated by the boiler feed water treatment system and condensate polishing regeneration is fed into the raw water reservoir after the pH value is qualified, and participates in sedimentation and coagulation treatment together with the raw water; After the oily wastewater is qualified for treatment, it enters the raw water reservoir and participates in sedimentation and coagulation treatment together with the raw water; After domestic sewage is treated and qualified, it enters the raw water storage tank and participates in sedimentation and coagulation treatment together with the raw water.

5. The method for optimizing the water system of a thermal power plant according to claim 4, characterized in that: The precipitation and coagulation treatment adopts membrane separation technology, including reverse osmosis membrane or ultrafiltration membrane.

6. The method for optimizing the water system of a thermal power plant according to claim 4, characterized in that: The domestic sewage treatment and oily wastewater treatment adopts biological treatment enhancement technology, including high-efficiency bacteria or biofilm reactors.

7. The method for optimizing the water system of a thermal power plant according to claim 4, characterized in that: Oily wastewater treatment includes three-stage processes: demulsification, ultrafiltration and activated carbon adsorption.

8. The method for optimizing the water system of a thermal power plant according to claim 4, characterized in that: The sludge dewatering process includes hot alkali pretreatment and plate and frame filter press combination process.

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