CN112159068A - Circular economy system and method for co-processing pollutants of thermal power plant and municipal sewage treatment plant - Google Patents
Circular economy system and method for co-processing pollutants of thermal power plant and municipal sewage treatment plant Download PDFInfo
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- CN112159068A CN112159068A CN202011111283.9A CN202011111283A CN112159068A CN 112159068 A CN112159068 A CN 112159068A CN 202011111283 A CN202011111283 A CN 202011111283A CN 112159068 A CN112159068 A CN 112159068A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
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- Chemical & Material Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a recycling economy system and a recycling economy method for the cooperative treatment of pollutants in a thermal power plant and a municipal sewage treatment plant, which comprise a municipal sewage collecting pipe network, a raw water tank of the sewage treatment plant, a treatment system of the sewage treatment plant, a reclaimed water treatment system of a power plant, a boiler make-up water system, a boiler system, a power generation system, a heat supply system, a sludge concentration tank of the power plant, a sludge drying system, a fuel system of the power plant, a boiler system and a flue gas treatment system of the power plant.
Description
Technical Field
The invention belongs to the field of energy conservation and environmental protection, and relates to a recycling economy system and a recycling economy method for the cooperative treatment of pollutants in a thermal power plant and a municipal sewage treatment plant.
Background
The sludge of the urban sewage treatment plant is solid waste and mainly comprises bottom sludge of a primary sedimentation tank and an oil separation tank, floating slag of an air flotation machine, residual activated sludge and chemical sludge of other process units. With the rapid development of urbanization in China, the sludge yield in cities and towns is increasing day by day. The sludge organic matters are easy to decay, have strong odor, contain parasitic ova, pathogenic microorganisms, heavy metals such as copper and mercury, and harmful substances such as polychlorinated biphenyl and dioxin, and can cause serious secondary pollution to the environment if not properly treated. How to treat the waste sludge generated by the urban sewage treatment plant becomes an increasingly serious problem. The sludge treatment mode in China is still mainly landfill, and in addition, the treatment capacity of the sewage treatment enterprises in cities and towns in China is insufficient, the treatment means is backward, a large amount of sludge is not treated in a standardized way, so that secondary pollution is directly caused, and the ecological environment is seriously threatened.
Incineration is a major method for effectively treating sludge. The treatment process taking incineration as a core can completely carbonize organic matters, can reduce the volume of sludge to the maximum extent, and can convert energy in the sludge into electric energy or heat energy to fully utilize the sludge. At present, the application of independent sludge drying and incineration at home and abroad is relatively more, but the cost of an incineration plant which is suitable for independently incinerating sludge is huge due to construction and operation reasons, and the effect is poor. Moreover, the drying liquid produced in the independent drying and incineration process of the sludge has high content of organic matters and ammonia nitrogen, and still needs to be automatically treated by an incineration plant at present, so that the treatment difficulty of the waste water is high, the investment is high, the treated water cannot be reasonably and effectively recycled, and secondary pollution and waste of water resources are caused to a certain extent.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a circular economic system and a circular economic method for the cooperative treatment of pollutants in a thermal power plant and a municipal sewage treatment plant.
In order to achieve the aim, the recycling economic system for the cooperative treatment of pollutants in the thermal power plant and the municipal sewage treatment plant comprises a municipal sewage collecting pipe network, a raw water tank of the sewage plant, a treatment system of the sewage treatment plant, a reclaimed water treatment system of a power plant, a boiler make-up water system, a boiler system, a power generation system, a heat supply system, a sludge concentration tank of the power plant, a sludge drying system, a fuel system of the power plant, a boiler system and a flue gas treatment system of the power plant;
an outlet of the municipal sewage collecting pipe network is communicated with an inlet of a boiler make-up water system through a raw water pool of a sewage plant, a treatment system of a sewage treatment plant and a reclaimed water treatment system of a power plant, an outlet of the boiler make-up water system is communicated with a water inlet of the boiler system, a steam outlet of the boiler system is communicated with a steam inlet of a power generation system, and an exhaust steam outlet of the power generation system is communicated with an inlet of a heat supply system;
a sludge discharge port of a treatment system of a sewage treatment plant and a sludge discharge port of a reclaimed water treatment system in a power plant are communicated with an inlet of a sludge concentration tank of the power plant, a sludge outlet of the sludge concentration tank of the power plant is communicated with a sludge inlet of a sludge drying system, and a dried sludge discharge port of the sludge drying system is communicated with an inlet of a boiler system through a fuel system of the power plant; the sludge drying liquid discharge port of the sludge drying system is communicated with a municipal sewage collecting pipe network, the condensate discharge port of the sludge drying system is communicated with a boiler water supply system, the smoke discharge port of the boiler system is communicated with a flue gas treatment system of a power plant, and the outlet of the heat supply system is communicated with an external heat supply network and a steam inlet of a sludge concentration tank of the power plant.
The water outlet of the treatment system of the sewage treatment plant is communicated with the reclaimed water treatment system of the power plant through a reclaimed water conveying pipe.
The outlet of the water treatment system in the power plant is communicated with a boiler water supply system through an industrial water pipe and a water production pipe.
The outlet of the boiler water supply system is communicated with the water inlet of the boiler system through a boiler system water supply pipe.
The flue gas outlet of the boiler system is communicated with the flue gas treatment system of the power plant through a boiler smoke exhaust pipeline.
The power generation system comprises a steam turbine system and a generator system, wherein an output shaft of the steam turbine system is connected with a driving shaft of the generator system, a steam outlet of the boiler system is communicated with a steam inlet of the steam turbine system through a high-pressure steam output pipe, and a waste steam outlet of the steam turbine system is communicated with a heat supply system through a low-pressure steam output pipe.
The outlet of the heat supply system is communicated with the hot steam inlet of the sludge drying system through a sludge drying steam conveying pipe;
a dried sludge discharge port of the sludge drying system is communicated with a power plant fuel system through a dried sludge conveying pipeline;
a condensate discharge port of the sludge drying system is communicated with a boiler water supply system through a condensate recovery pipe;
a sludge drying liquid discharge port of the sludge drying system is communicated with a municipal sewage collecting pipe network through a sludge drying liquid conveying pipe;
the sludge inlet of the sludge drying system is communicated with the sludge outlet at the bottom of the sludge concentration tank of the power plant through a sludge discharge pipe.
A sludge outlet of a treatment system of a sewage treatment plant is communicated with an inlet of a sludge concentration tank of a power plant through an urban sludge conveying system, and a sludge outlet of a reclaimed water treatment system of the power plant is communicated with an inlet of the sludge concentration tank of the power plant through a reclaimed water sludge conveying pipe;
the supernatant outlet of the power plant sludge concentration tank is communicated with the inlet of the water treatment system in the power plant through a supernatant return pipe.
A recycling economy method for the cooperative treatment of pollutants in a thermal power plant and a municipal sewage treatment plant comprises the following steps:
urban sewage is collected through a municipal sewage collecting pipe network and then is conveyed to a raw water pool of a sewage plant for homogenization, then enters a treatment system of the sewage plant for treatment, water output by the treatment system of the sewage plant is conveyed to a reclaimed water treatment system of a power plant through a reclaimed water conveying pipe for treatment so as to reduce the alkalinity and hardness of reclaimed water and remove residual organic matters, so that the requirement of the reclaimed water quality for production water of each water system of the power plant is met, and reclaimed water output by the reclaimed water treatment system of the power plant is conveyed to a boiler make-up water system of the power plant through an industrial water pipe;
in a boiler water supply system, reclaimed water in the boiler water supply system is subjected to desalination treatment and finally prepared into desalted water, the desalted water is used as a power generation medium and is supplied into the boiler system, boiler water is heated in the boiler system to generate high-pressure steam, then the high-pressure steam enters the power generation system to do work, and exhaust steam discharged by the power generation system enters a heat supply system;
sludge output by a treatment system of a sewage treatment plant enters a sludge concentration tank of a power plant, sludge output by a reclaimed water treatment system of the power plant is conveyed to the sludge concentration tank of the power plant, supernatant output by the sludge concentration tank of the power plant enters the reclaimed water treatment system of the power plant, sludge output from the bottom of the sludge concentration tank of the power plant is conveyed to a sludge drying system for further drying treatment, meanwhile, steam output by a heat supply system enters the sludge drying system as a drying heat source, and the steam is discharged into a boiler water supply system through a condensate discharge port of the sludge drying system for recycling after being heated in the sludge drying system to form condensate; the dried sludge enters a fuel system of a power plant, then enters a coal mill together with coal for milling, and finally is blown into a boiler system for incineration, and waste gas generated after the dried sludge is combusted and flue gas generated by the combustion of boiler pulverized coal enter a flue gas treatment system of the power plant for standard treatment;
and conveying sludge drying liquid generated in the sludge drying process into a municipal sewage collecting pipe network.
The invention has the following beneficial effects:
according to the recycling economic system and the method for the cooperative treatment of pollutants in the thermal power plant and the municipal sewage plant, during specific operation, the traditional independent sludge drying and incineration technology at home and abroad is abandoned, the drying and sludge coupling power generation is carried out by means of the existing coal-fired power plant system, and the respective technical advantages and functional characteristics of the municipal sewage plant and the coal-fired power plant are combined, so that on one hand, the wastewater of the sewage plant is used as a production water source for supplying power and heat for the power plant to the outside, on the other hand, the sludge generated by the sewage plant is subjected to drying and incineration disposal, the flexibility of coal-electricity fuels is realized, and the consumption proportion of non-fossil. In addition, the dried sludge and the fire coal are mixed and combusted, the existing equipment such as a coal-fired unit for combustion, tail gas purification, power generation and the like is fully utilized, the sludge incineration treatment cost is greatly reduced, particulate matters generated by sludge incineration are treated by a flue gas treatment system of a power plant along with flue gas, the dried liquid generated in the sludge drying process is sent into a municipal sewage collecting pipe network, the treated water is used as reclaimed water for the comprehensive utilization of the power plant, the sludge reduction, harmless, resource and large-scale treatment are efficiently realized, the water resource is saved, no secondary pollution is caused, the comprehensive prevention and control of atmosphere, water and soil pollution are facilitated, and the economic and social benefits are greater.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a municipal sewage collecting pipe network, 2 is a raw water tank of a sewage plant, 3 is a treatment system of the sewage plant, 4 is a reclaimed water treatment system of a power plant, 5 is a reclaimed water delivery pipe, 6 is an industrial water pipe, 7 is a sludge concentration tank of the power plant, 8 is a reclaimed water sludge delivery pipe, 9 is a supernatant return pipe, 10 is a municipal sludge delivery system, 11 is a sludge drying system, 12 is a sludge discharge pipe, 13 is a sludge inlet, 14 is a sludge drying liquid discharge port, 15 is a dried sludge discharge port, 16 is a hot steam inlet, 17 is a condensate discharge port, 18 is a sludge drying liquid delivery pipe, 19 is a sludge delivery pipe, 20 is a fuel system of the power plant, 21 is a condensate recovery pipe, 22 is a boiler water supply system, 23 is a water production pipe, 24 is a boiler system, 25 is a boiler smoke discharge pipe, 26 is a flue gas treatment system of the power plant, 27 is a boiler system water supply pipe, 28 is, 29 is a power generation system, 30 is a steam turbine system, 31 is a generator system, 32 is a low-pressure steam output pipe, 33 is a heat supply system, and 34 is a sludge drying steam conveying pipe.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the recycling economy system for the cooperative treatment of pollutants in a thermal power plant and a municipal sewage treatment plant according to the present invention includes a municipal sewage collection pipe network 1, a raw water tank 2 of the sewage treatment plant, a treatment system 3 of the sewage treatment plant, a reclaimed water treatment system 4 of the power plant, a boiler make-up water system 22, a boiler system 24, a power generation system 29, a heat supply system 33, a sludge concentration tank 7 of the power plant, a sludge drying system 11, a fuel system 20 of the power plant, a boiler system 24, and a flue gas treatment system 26 of the power plant; an outlet of the municipal sewage collecting pipe network 1 is communicated with an inlet of a boiler water replenishing and supplying system 22 through a raw water pool 2 of a sewage plant, a treatment system 3 of a sewage treatment plant and a reclaimed water treatment system 4 of a power plant, an outlet of the boiler water replenishing and supplying system 22 is communicated with a water inlet of a boiler system 24, a steam outlet of the boiler system 24 is communicated with a steam inlet of a power generation system 29, and a steam exhaust outlet of the power generation system 29 is communicated with an inlet of a heat supply system 33; a sludge discharge port of a treatment system 3 of a sewage treatment plant and a sludge discharge port of a reclaimed water treatment system 4 in a power plant are communicated with an inlet of a sludge concentration tank 7 of the power plant, a sludge outlet of the sludge concentration tank 7 of the power plant is communicated with a sludge inlet 13 of a sludge drying system 11, and a dried sludge discharge port 15 of the sludge drying system 11 is communicated with an inlet of a boiler system 24 through a fuel system 20 of the power plant; a sludge drying liquid discharge port 14 of the sludge drying system 11 is communicated with a municipal sewage collecting pipe network 1, a condensate discharge port 17 of the sludge drying system 11 is communicated with a boiler make-up water system 22, a smoke discharge port of a boiler system 24 is communicated with a flue gas treatment system 26 of a power plant, and an outlet of a heat supply system 33 is communicated with an external heat supply network and a steam inlet of a sludge concentration tank 7 of the power plant.
The water outlet of the treatment system 3 of the sewage treatment plant is communicated with the reclaimed water treatment system 4 of the power plant through a reclaimed water conveying pipe 5; the outlet of the water treatment system 4 in the power plant is communicated with a boiler water supply system 22 through an industrial water pipe 6 and a water production pipe 23; the outlet of the boiler water supply system 22 is communicated with the water inlet of the boiler system 24 through a boiler system water supply pipe 27; the flue gas outlet of the boiler system 24 is communicated with a power plant flue gas treatment system 26 through a boiler smoke exhaust pipeline 25.
The power generation system 29 comprises a steam turbine system 30 and a generator system 31, wherein an output shaft of the steam turbine system 30 is connected with a driving shaft of the generator system 31, a steam outlet of the boiler system 24 is communicated with a steam inlet of the steam turbine system 30 through a high-pressure steam output pipe 28, and a steam exhaust outlet of the steam turbine system 30 is communicated with a heat supply system 33 through a low-pressure steam output pipe 32.
The outlet of the heat supply system 33 is communicated with the hot steam inlet 16 of the sludge drying system 11 through a sludge drying steam conveying pipe 34; a dried sludge discharge port 15 of the sludge drying system 11 is communicated with a power plant fuel system 20 through a dried sludge conveying pipeline 19; a condensate discharge port 17 of the sludge drying system 11 is communicated with a boiler water supply system 22 through a condensate recovery pipe 21; a sludge drying liquid discharge port 14 of the sludge drying system 11 is communicated with a municipal sewage collecting pipe network 1 through a sludge drying liquid conveying pipe 18; a sludge inlet 13 of the sludge drying system 11 is communicated with a sludge outlet at the bottom of the sludge concentration tank 7 of the power plant through a sludge discharge pipe 12.
A sludge outlet of a treatment system 3 of a sewage treatment plant is communicated with an inlet of a sludge concentration tank 7 of a power plant through an urban sludge conveying system 10, and a sludge outlet of a reclaimed water treatment system 4 of the power plant is communicated with an inlet of the sludge concentration tank 7 of the power plant through a reclaimed water sludge conveying pipe 8; the supernatant outlet of the power plant sludge concentration tank 7 is communicated with the inlet of the water treatment system 4 in the power plant through a supernatant return pipe 9.
The invention relates to a recycling economic method for the cooperative treatment of pollutants in a thermal power plant and a municipal sewage treatment plant, which comprises the following steps:
urban sewage is collected by a municipal sewage collecting pipe network 1 and then is conveyed to a raw water tank 2 of a sewage plant, the sewage is homogenized in the raw water tank 2 of the sewage plant and then enters a treatment system 3 of the sewage plant for treatment, and the qualified urban sewage is used as reclaimed water and is conveyed to the power plant for producing a water source through a reclaimed water conveying pipe 5 laid between the urban sewage plant and the power plant; urban reclaimed water enters a reclaimed water treatment system 4 of a power plant arranged in the power plant for treatment so as to reduce the alkalinity and hardness of the reclaimed water and remove residual organic matters, so as to meet the water quality requirement of production water of each water system of the power plant, and the reclaimed water output by the reclaimed water treatment system 4 of the power plant is conveyed to a boiler make-up water system 22 of the power plant for use through an industrial water pipe 6.
In the boiler make-up water system 22, the reclaimed water in the boiler make-up water system 22 is subjected to deep desalination treatment and finally made into desalted water, and then is supplemented into the boiler system 24 as a power generation medium through a boiler system make-up water pipe 27, the boiler make-up water is heated in the boiler system 24 to generate high-pressure steam, wherein the generated high-pressure steam enters a power generation system 29 through a high-pressure steam output pipe 28 to push a steam turbine system 30 to do work, so that an engine system 31 is driven to generate power; the exhaust steam discharged from the steam turbine system 30 is output to the heat supply system 33 through the low-pressure steam output pipe 32 for supplying steam or supplying heat.
Meanwhile, a large amount of sludge is generated in the process of treating sewage by the reclaimed water treatment system 4 in the municipal sewage plant and the power plant, wherein the sludge output by the treatment system 3 in the sewage treatment plant enters the sludge concentration tank 7 in the power plant through the municipal sludge conveying system 10, the sludge output by the reclaimed water treatment system 4 in the power plant is conveyed into the sludge concentration tank 7 in the power plant through the reclaimed water sludge conveying pipe 8, the supernatant output by the sludge concentration tank 7 in the power plant enters the reclaimed water treatment system 4 in the power plant through the supernatant return pipe 9, the sludge output from the bottom of the sludge concentration tank 7 in the power plant is conveyed into the sludge drying system 11 through the sludge discharge pipe 12 for further drying treatment, so that the sludge is convenient to convey and burn, meanwhile, the steam output by the heat supply system 33 enters the sludge drying system 11 as a heat source, wherein the parameters of the steam are 0.5-0.6MPa for drying, 160-170 ℃, the steam is discharged in the sludge drying system 11 to form condensate after being dried and dried to form 17, discharging the condensate, and then entering a boiler feedwater system 22 through a condensate recovery pipe 21 for recycling;
the sludge is turned and stirred through the rotation of the internal movable part of the sludge drying system 11, the sludge is fully contacted with the heated surface, so that a large amount of water in the sludge is evaporated, meanwhile, the sludge is turned over to a dried sludge discharge port 15 along with the rotation of the internal movable part of the sludge drying system 11 and is discharged, the dried sludge enters a power plant fuel system 20 through a dried sludge conveying pipeline 19, then enters a coal mill together with coal for grinding, and finally is blown into a boiler system 24 for burning, the mixing burning ratio of the sludge and the coal is controlled within 10%, the energy in the sludge is converted into heat energy through burning, so that the sludge is fully utilized, in addition, the waste gas generated after the burning of the dried sludge and the flue gas generated by the burning of the coal powder of the boiler enter a power plant flue gas treatment system 26 for standard treatment.
The coal-fired unit is provided with a perfect flue gas purification device, sludge accounts for less than 10% of coal consumption, tail gas purification can normally and efficiently operate, and particulate matters generated by sludge incineration can be efficiently removed along with flue gas through flue gas environment-friendly treatment facilities such as dust removal, desulfurization and the like. In addition, the dried sludge is taken as a fuel in a region of 20-40 m and is sent into the hearth, the combustion temperature is far higher than 850 ℃, and the generation of a large amount of dioxin can be effectively inhibited.
A large amount of sludge drying liquid can be generated in the sludge drying process and is discharged from a sludge drying liquid discharge port 14 of a sludge drying system 11, the sludge drying liquid contains a large amount of ammonia nitrogen, COD, total phosphorus and other biochemical indexes, the water quality is relatively complex, the sludge drying liquid needs to be subjected to standard treatment through a professional biochemical treatment process, but the sludge drying liquid does not have delivery and treatment capabilities according to the current thermal power plant, so that the sludge drying liquid is connected into a municipal sewage collecting pipe network 1 through a sludge drying liquid conveying pipe 18 and is finally conveyed to a municipal sewage treatment plant with a more professional treatment scale and facility for treatment, and the qualified treated sewage is conveyed to the power plant as reclaimed water to be comprehensively utilized as production water.
Claims (9)
1. A recycling economic system for the cooperative treatment of pollutants in a thermal power plant and a municipal sewage treatment plant is characterized by comprising a municipal sewage collecting pipe network (1), a sewage plant raw water tank (2), a sewage treatment plant treatment system (3), a power plant reclaimed water treatment system (4), a boiler water supply system (22), a boiler system (24), a power generation system (29), a heat supply system (33), a power plant sludge concentration tank (7), a sludge drying system (11), a power plant fuel system (20), a boiler system (24) and a power plant flue gas treatment system (26);
an outlet of the municipal sewage collecting pipe network (1) is communicated with an inlet of a boiler water supply system (22) through a sewage plant raw water pool (2), a sewage treatment plant treatment system (3) and a power plant reclaimed water treatment system (4), an outlet of the boiler water supply system (22) is communicated with a water inlet of the boiler system (24), a steam outlet of the boiler system (24) is communicated with a steam inlet of a power generation system (29), and a steam exhaust outlet of the power generation system (29) is communicated with an inlet of a heat supply system (33);
a sludge discharge port of a treatment system (3) of a sewage treatment plant and a sludge discharge port of a reclaimed water treatment system (4) in a power plant are communicated with an inlet of a sludge concentration tank (7) of the power plant, a sludge outlet of the sludge concentration tank (7) of the power plant is communicated with a sludge inlet (13) of a sludge drying system (11), and a dried sludge discharge port (15) of the sludge drying system (11) is communicated with an inlet of a boiler system (24) through a fuel system (20) of the power plant; a sludge drying liquid discharge port (14) of the sludge drying system (11) is communicated with a municipal sewage collecting pipe network (1), a condensate discharge port (17) of the sludge drying system (11) is communicated with a boiler water supply system (22), a smoke discharge port of a boiler system (24) is communicated with a flue gas treatment system (26) of a power plant, and an outlet of a heat supply system (33) is communicated with an external heat supply network and a steam inlet of a sludge concentration tank (7) of the power plant.
2. The recycling economy system for the co-treatment of pollutants in a thermal power plant and a municipal sewage treatment plant according to claim 1, characterized in that the water outlet of the treatment system (3) of the sewage treatment plant is communicated with the reclaimed water treatment system (4) of the power plant through a reclaimed water conveying pipe (5).
3. The recycling economy system for the co-treatment of pollutants in thermal power plants and municipal sewage treatment plants according to claim 1, characterized in that the outlet of the water treatment system (4) in the power plant is connected to the boiler make-up water system (22) through an industrial water pipe (6) and a water production pipe (23).
4. The thermal power plant and municipal sewage treatment plant pollutant co-processing circular economy system of claim 1, characterized by that, the boiler make-up water system (22) outlet through boiler system make-up water pipe (27) and boiler system (24) water inlet linked.
5. The recycling economy system for thermal power plant and municipal sewage treatment plant contaminant coprocessing of claim 1, characterized in that the flue gas outlet of the boiler system (24) is in communication with the power plant flue gas treatment system (26) via a boiler flue gas duct (25).
6. The recycling economy system for the co-processing of pollutants in a thermal power plant and a municipal sewage treatment plant according to claim 1, wherein the power generation system (29) comprises a steam turbine system (30) and a generator system (31), wherein an output shaft of the steam turbine system (30) is connected to a driving shaft of the generator system (31), a steam outlet of the boiler system (24) is communicated with a steam inlet of the steam turbine system (30) through a high pressure steam output pipe (28), and a steam exhaust outlet of the steam turbine system (30) is communicated with a heat supply system (33) through a low pressure steam output pipe (32).
7. The recycling economy system for the coordinated treatment of pollutants in a thermal power plant and a municipal sewage treatment plant according to claim 1, characterized in that the outlet of the heat supply system (33) is communicated with the hot steam inlet (16) of the sludge drying system (11) through a sludge drying steam conveying pipe (34);
a dried sludge discharge port (15) of the sludge drying system (11) is communicated with a power plant fuel system (20) through a dried sludge conveying pipeline (19);
a condensate discharge port (17) of the sludge drying system (11) is communicated with a boiler water supply system (22) through a condensate recovery pipe (21);
a sludge drying liquid discharge port (14) of the sludge drying system (11) is communicated with the municipal sewage collecting pipe network (1) through a sludge drying liquid conveying pipe (18);
a sludge inlet (13) of the sludge drying system (11) is communicated with a sludge outlet at the bottom of the sludge concentration tank (7) of the power plant through a sludge discharge pipe (12).
8. The recycling economy system for the cooperative treatment of pollutants in a thermal power plant and a municipal sewage treatment plant according to claim 1, characterized in that the sludge outlet of the treatment system (3) of the sewage treatment plant is communicated with the inlet of the sludge concentration tank (7) of the power plant through a municipal sludge conveying system (10), and the sludge outlet of the reclaimed water treatment system (4) of the power plant is communicated with the inlet of the sludge concentration tank (7) of the power plant through a reclaimed water sludge conveying pipe (8);
the supernatant outlet of the power plant sludge concentration tank (7) is communicated with the inlet of the water treatment system (4) in the power plant through a supernatant return pipe (9).
9. A recycling economy method for the cooperative treatment of pollutants of a thermal power plant and a municipal sewage treatment plant is characterized in that the recycling economy system for the cooperative treatment of pollutants of a thermal power plant and a municipal sewage treatment plant based on claim 1 comprises the following steps:
urban sewage is collected by a municipal sewage collecting pipe network (1) and then is conveyed to a raw water pool (2) of a sewage plant for homogenization, then enters a treatment system (3) of the sewage plant for treatment, water output by the treatment system (3) of the sewage plant is conveyed to a reclaimed water treatment system (4) of a power plant for treatment by a reclaimed water conveying pipe (5) so as to reduce the alkalinity and the hardness of reclaimed water and remove residual organic matters, so that the requirement of the reclaimed water quality for the production water of each water system of the power plant is met, and the reclaimed water output by the reclaimed water treatment system (4) of the power plant is conveyed to a boiler make-up water system (22) of the power plant by an industrial water pipe (6);
in the boiler water supply system (22), reclaimed water in the boiler water supply system (22) is subjected to desalination treatment and finally prepared into desalted water, the desalted water is supplied into the boiler system (24) as a power generation medium, boiler water is heated in the boiler system (24) to generate high-pressure steam, then the high-pressure steam enters the power generation system (29) to do work, and exhaust steam discharged by the power generation system (29) enters the heat supply system (33);
sludge output by a treatment system (3) of a sewage treatment plant enters a sludge concentration tank (7) of a power plant, sludge output by a reclaimed water treatment system (4) of the power plant is conveyed to the sludge concentration tank (7) of the power plant, supernatant output by the sludge concentration tank (7) of the power plant enters the reclaimed water treatment system (4) of the power plant, sludge output by the bottom of the sludge concentration tank (7) of the power plant is conveyed to a sludge drying system (11) for further drying treatment, meanwhile, steam output by a heat supply system (33) enters the sludge drying system (11) as a drying heat source, and the steam is discharged into a boiler water supply system (22) for recycling through a condensate discharge port (17) of the sludge drying system (11) after being released to form condensate in the sludge drying system (11); the dried sludge enters a fuel system (20) of a power plant, then enters a coal mill together with coal for milling, and finally is blown into a boiler system (24) for incineration, and waste gas generated after the dried sludge is combusted and flue gas generated by the combustion of boiler pulverized coal enter a flue gas treatment system (26) of the power plant for standard treatment;
sludge drying liquid generated in the sludge drying process is sent into a municipal sewage collecting pipe network (1).
Priority Applications (1)
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