Coal power unit coupling excrement and sludge power generation system and method

Abstract

The invention discloses a coal power unit coupling excrement and sludge power generation system and method, and belongs to the technical field of urban and rural organic waste resource utilization. The system disclosed by the invention comprises a feces pretreatment system, a sludge pretreatment system, a waste liquid treatment device, a mixture conveying system, a pulverized coal bunker, a boiler and a steam turbine, liquid outlets of the excrement pretreatment system and the sludge pretreatment system are respectively connected with an inlet of the waste liquid treatment device; solid outlets of the excrement pretreatment system and the sludge pretreatment system are respectively connected with an inlet of the mixture conveying system; an outlet of the pulverized coal bunker and an outlet of the mixture conveying system are converged through a pipeline and then are sequentially connected with a boiler and a steam turbine; waste heat outlets of the boiler and the steam turbine are respectively connected with the waste liquid treatment device through pipelines; and an outlet of the waste liquid treatment device is connected with the mixture conveying system. The system solves the technical problem that the existing urban and rural organic waste utilization effect is poor.

Description

Technical Field

[0001] The present invention belongs to the technical field of resource utilization of urban and rural organic waste, and particularly relates to a coal-fired power generation system and method for coupling manure and sludge. Background Art

[0002] Urban and rural organic waste (such as manure and sludge) is an important pollutant generated in urban and rural life. However, it contains a large amount of organic matter and has high potential for resource utilization. The organic matter in manure and sludge is mainly composed of carbohydrates, proteins and fats, and their calorific value ranges are 15 - 20 MJ / kg (dry basis) and 10 - 15 MJ / kg (dry basis) respectively. Through thermochemical conversion (such as combustion), these organic matters can be converted into heat energy for power generation or heating. In addition, the waste heat of the flue gas generated by boiler combustion and the waste heat generated by the expansion work of the steam turbine can be further recovered to heat the waste liquid or dry the solid mixture, forming an energy recycling system, so as to realize the efficient utilization of resources and the reduction of pollution.

[0003] Traditional methods for treating urban and rural organic waste mainly include landfill, composting and incineration. However, these methods have the following limitations: 1) Landfill treatment: The landfill treatment cycle is long, usually taking several years or even decades to completely degrade. Moreover, methane (CH4) generated during the landfill process is a powerful greenhouse gas, and its global warming potential is 28 - 36 times that of carbon dioxide (CO2). According to statistics, methane generated by landfills accounts for 3 - 5% of global greenhouse gas emissions. In addition, landfills occupy a large amount of land resources and may pollute groundwater and soil. 2) Composting treatment: Although composting treatment can convert organic waste into fertilizer, the treatment cycle is relatively long (usually 2 - 6 months), and it has high requirements for the composition of the waste, making it difficult to treat sludge containing heavy metals or other harmful substances. In addition, gases such as ammonia (NH3) and hydrogen sulfide (H2S) generated during the composting process cause secondary pollution to the environment. For example, the emission of NH3 during the composting process can reach 0.5 - 1.5 kg per ton of waste, having a negative impact on the atmospheric environment. 3) Incineration treatment: Incineration treatment can quickly reduce the volume of waste (the reduction rate can reach more than 90%), but traditional incineration technologies have problems such as incomplete combustion and low calorific value utilization rate (usually less than 30%). In addition, harmful substances such as dioxins and heavy metals are easily generated during the incineration process, posing a serious threat to the environment and human health. For example, the emission concentration of dioxins during the incineration process can reach 0.1 - 1.0 ng TEQ / m 3, far exceeding environmental protection standards. 4) Conveying blockage problem: The fecal sewage and sludge have high viscosity, and the traditional conveying system is prone to blockage during conveying, affecting the continuous and stable operation of the system. For example, when the traditional screw conveyor conveys fecal sewage and sludge with a high water content (>60%), the blockage rate is as high as 20 - 30%. 5) Energy waste: The traditional technology fails to fully utilize the waste heat of boiler flue gas and steam turbine, resulting in a large amount of energy waste. According to statistics, the waste heat of boiler flue gas accounts for 10 - 15% of the total calorific value of fuel, while the waste heat of steam turbine accounts for 5 - 10% of the total calorific value of fuel. Taking a 300MW coal-fired power unit as an example, the annually unused waste heat is equivalent to wasting about 15,000 - 20,000 tons of standard coal.

[0004] In recent years, researchers have tried to improve the treatment technology of organic waste in the following ways: 1) Co-combustion: Mixing fecal sewage and sludge with pulverized coal for combustion to improve energy utilization efficiency. However, due to the high water content of fecal sewage and sludge (usually 60 - 80%), direct co-combustion will lead to incomplete combustion and low calorific value utilization rate. For example, when the untreated fecal sewage and sludge are directly burned, the calorific value utilization rate is only 20 - 30%. 2) Pretreatment technology: Reducing the water content of fecal sewage and sludge through pretreatment technologies such as solid-liquid separation, crushing, and drying. For example, solid-liquid separation can reduce the water content of fecal sewage from 90% to 60 - 70%, and the drying technology can further reduce the water content to 10 - 15%. However, the traditional drying technology has high energy consumption and fails to fully utilize waste heat resources. For example, the energy consumption of the traditional hot air drying technology is about 800 - 1000 kWh / ton, and the economy is poor. 3) Waste heat recovery: Trying to recover the waste heat of boiler flue gas and steam turbine for heating waste liquid or drying solid mixtures. However, the efficiency of the traditional waste heat recovery system is low, and the energy recovery potential is not fully exerted. For example, the thermal efficiency of the traditional waste heat recovery system is only 40 - 50%, and there is still much room for improvement. Summary of the Invention

[0005] The purpose of the present invention is to provide a coal-fired power unit coupled fecal sewage and sludge power generation system and method to solve the technical problem of poor utilization effect of existing urban and rural organic waste.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The present invention discloses a power generation system for coupling manure and sludge in a coal-fired power unit, comprising: a manure pretreatment system, a sludge pretreatment system, a waste liquid treatment device, a mixture conveying system, a pulverized coal bin, a boiler and a steam turbine; the liquid outlets of the manure pretreatment system and the sludge pretreatment system are respectively connected to the inlet of the waste liquid treatment device; the solid outlets of the manure pretreatment system and the sludge pretreatment system are respectively connected to the inlet of the mixture conveying system; the outlet of the pulverized coal bin and the outlet of the mixture conveying system are joined through a pipeline and then are successively connected to the boiler and the steam turbine; the waste heat outlets of the boiler and the steam turbine are respectively connected to the waste liquid treatment device through pipelines; the outlet of the waste liquid treatment device is connected to the mixture conveying system.

[0008] Further, the manure pretreatment system comprises a manure receiving device and a solid-liquid separation device which are successively connected; the liquid outlet of the solid-liquid separation device is connected to the inlet of the waste liquid treatment device; the solid outlet of the solid-liquid separation device is connected to the inlet of the mixture conveying system.

[0009] Further, the inlet of the manure receiving device is connected to a manure source.

[0010] Further, the sludge pretreatment system comprises a sludge receiving device and a sludge crushing device which are successively connected; the liquid outlet of the sludge crushing device is connected to the inlet of the waste liquid treatment device; the solid outlet of the sludge receiving device is connected to the inlet of the mixture conveying system.

[0011] Further, the inlet of the sludge receiving device is connected to a sludge source.

[0012] Further, the mixture conveying system comprises a drying device, a forming device and a screw conveyor which are successively connected; the solid outlets of the solid-liquid separation device and the sludge crushing device are respectively connected to the inlet of the drying device; the outlet of the waste liquid treatment device is connected to the drying device; the outlet of the screw conveyor and the outlet of the mixture conveying system are joined through a pipeline and then are successively connected to the boiler and the steam turbine.

[0013] Further, a first pressurizing port is connected and arranged between the forming device and the screw conveyor.

[0014] Further, the outlet of the screw conveyor and the outlet of the pulverized coal bin are joined through a pipeline and then are successively connected to the boiler and the steam turbine through a screw feeder.

[0015] Further, a second pressurizing port is connected and arranged between the pulverized coal bin and the screw feeder.

[0016] The present invention also discloses a using method of the above power generation system for coupling manure and sludge in a coal-fired power unit, comprising the following steps:

[0017] The external manure and sludge are respectively transported to the manure pretreatment system and the sludge pretreatment system for pretreatment. The waste liquid obtained from the manure pretreatment system and the sludge pretreatment system is transported to the waste liquid treatment device, and the obtained solid substances are transported to the mixture transportation system for processing and shaping. Subsequently, they are mixed with the pulverized coal in the pulverized coal bin and then successively fed into the boiler and the steam turbine for combustion power generation. During the power generation process, the waste heat generated in the boiler and the steam turbine enters the waste liquid treatment device through the waste heat outlet to heat the waste liquid in the waste liquid treatment device and provide a heating medium for the mixture transportation system.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention discloses a coal-fired power generation system coupled with manure and sludge. By setting up a manure pretreatment system, a sludge pretreatment system, a waste liquid treatment device, a mixture transportation system, a pulverized coal bin, a boiler and a steam turbine, the co-incineration of manure, sludge and coal-fired power projects is realized, significantly improving the resource utilization rate. At the same time, the waste heat generated during the incineration process and the waste liquid obtained from the pretreatment of manure and sludge are utilized as heating media for drying the solid mixture, significantly reducing the drying energy consumption. Through the integrated treatment setting, this system not only reduces the drying energy consumption, improves the waste utilization effect, but also reduces greenhouse gas emissions, having significant environmental and economic benefits.

[0020] Furthermore, pressure-increasing ports are arranged at the front ends of both the screw conveyor and the screw feeder, effectively solving the blockage problem during the transportation process, effectively preventing the blockage of the pulverized coal and the solid mixture of manure and sludge during the transportation process, ensuring the uniform transportation of the mixture to the boiler, and improving the stability of the whole system.

[0021] The present invention also discloses a method for coupling a coal-fired power generation system with manure and sludge power generation. Through theoretical proof based on relevant simulation experiment results, the system of the present invention reduces the moisture content of manure and sludge to 10-15% through pretreatment and mixes it with pulverized coal in a ratio of 1:4 for combustion, thereby improving the calorific value utilization rate; uses boiler flue gas and steam turbine waste heat to heat the waste liquid to 80-90 °C for drying the solid mixture, which can effectively reduce the drying energy consumption; sets a pressurizing port at the front end of the screw conveyor to prevent blockage of the pulverized coal and the solid mixture of manure and sludge during transportation and improve the stability of system operation; sets a pressurizing port at the front end of the screw feeder to reduce fuel waste caused by blockage and effectively improve the combustion efficiency; sets a scheme for recovering and reusing boiler flue gas waste heat to heat the waste liquid to 80-90 °C, significantly improving the energy utilization efficiency. Taking a 300MW coal-fired power generation unit as an example, about 15,000-20,000 tons of standard coal of flue gas waste heat can be recovered annually; taking a 300MW steam turbine as an example, about 28,000 tons of standard coal of exhaust steam waste heat can be recovered annually. The optimized system improves the overall thermal efficiency and has significant economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of the coal-fired power generation system coupled with manure and sludge;

[0023] Wherein: 1 - manure pretreatment system; 2 - manure receiving device; 3 - solid-liquid separation device; 4 - sludge pretreatment system; 5 - sludge receiving device; 6 - sludge crushing device; 7 - mixture conveying system; 8 - drying device; 9 - forming device; 10 - first pressurizing port; 11 - forming device; 12 - screw feeder; 13 - second pressurizing port; 14 - pulverized coal bin; 15 - boiler; 16 - steam turbine; 17 - waste liquid treatment device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0026] The present invention discloses a coal-fired power generation system coupled with manure and sludge, which includes: a manure pretreatment system 1, a sludge pretreatment system 4, a waste liquid treatment device 17, a mixture conveying system 7, a pulverized coal bin 14, a boiler 15 and a steam turbine 16; wherein, the manure pretreatment system 1 and the sludge pretreatment system 4 are used to pretreat the manure and sludge from the outside. The manure enters the manure pretreatment system 1 through the manure source and is separated into waste liquid and solid matter; the sludge enters the sludge pretreatment system 4 through the sludge source and is separated into waste liquid and solid matter; the waste liquid therein enters the waste liquid treatment device 17 and is used as a heating medium for drying the manure and sludge solid mixture; the solid matter is collected through pipelines and then enters the sludge pretreatment system 4 for processing and forming, and then is mixed with the pulverized coal from the pulverized coal bin 14 and sequentially transported to the boiler 15 and the steam turbine 16 for combustion power generation; the waste heat in the boiler 15 and the steam turbine 16 is transported to the waste liquid treatment device 17 through the waste heat outlet to heat the waste liquid, which is used to provide the heating medium for the sludge pretreatment system 4 to dry the solid mixture.

[0027] Preferably, the manure pretreatment system 1 includes a manure receiving device 2 and a solid-liquid separation device 3 connected in sequence; the sludge pretreatment system 4 includes a sludge receiving device 5 and a sludge crushing device 6 connected in sequence; the mixture conveying system 7 includes a drying device 8, a forming device 9 and a screw conveyor 11 connected in sequence.

[0028] Preferably, since the traditional conveying system has a blockage rate as high as 20-30% when conveying manure and sludge with a high moisture content (>60%), seriously affecting the continuous operation of the system, the present invention is provided with a first pressurizing port 10 between the forming device 9 and the screw conveyor 11, which effectively solves the blockage problem during the conveying process and reduces the blockage rate to less than 5%; taking a 300MW coal-fired power generation unit as an example, the annual downtime caused by blockage can be reduced by about 200 hours, and the system operation efficiency can be increased by 10-15%; the setting of the first pressurizing port 10 not only reduces the maintenance cost, but also ensures the stable conveying of the solid mixture, providing a reliable guarantee for subsequent mixed combustion.

[0029] Preferably, since the traditional feeding system is prone to blockage due to material accumulation when transporting highly viscous mixtures, which affects the combustion efficiency and system stability, a second pressurizing port 13 is connected and provided between the pulverized coal bin 14 and the screw feeder 12 in the present invention to prevent blockage of the pulverized coal and the manure and sludge solid mixture during transportation, and ensure the uniform transportation of the mixture to the boiler. Taking a 300MW coal-fired power unit as an example, it can reduce the fuel waste caused by blockage by about 1000 tons per year and improve the combustion efficiency by 5-10%. The setting of the second pressurizing port 13 not only improves the reliability of the system, but also reduces the fuel cost and maintenance cost.

[0030] Preferably, the traditional technology fails to make full use of the waste heat of the boiler flue gas (accounting for 10-15% of the total calorific value of the fuel), resulting in a large amount of energy waste. The present invention recovers the waste heat of the flue gas of the boiler 15 and uses it to heat the waste liquid in the waste liquid treatment device 17 to 80-90°C, significantly improving the energy utilization efficiency. Taking a 300MW coal-fired power unit as an example, it can recover about 15,000-20,000 tons of standard coal of waste heat from the flue gas per year and save about 3-5 million yuan of fuel cost. The recovery and utilization of the waste heat of the flue gas not only reduces the drying energy consumption, but also reduces the greenhouse gas emissions, with significant environmental and economic benefits.

[0031] Preferably, the traditional technology fails to make full use of the waste heat of the steam turbine (accounting for 5-10% of the total calorific value of the fuel), resulting in energy waste. The present invention recovers the waste heat generated by the expansion work of the steam turbine 16 and uses it to heat the waste liquid in the waste liquid treatment device 17 to 80-90°C, further improving the energy utilization efficiency. Taking a 300MW coal-fired power unit as an example, it can recover about 8,000-10,000 tons of standard coal of waste heat from the steam turbine per year and save about 2-3 million yuan of fuel cost. The recovery and utilization of the waste heat of the steam turbine not only realizes the multi-stage utilization of energy, but also improves the overall thermal efficiency of the system to more than 70%, with significant economic and environmental benefits.

[0032] Preferably, the traditional drying technology (such as hot air drying) has high energy consumption, about 800-1000 kWh / ton, and fails to make full use of the waste liquid resources. The present invention uses the waste liquid in the waste liquid treatment device 17 as a heating medium for drying the solid mixture in the drying device 8, significantly reducing the drying energy consumption.

[0033] Preferably, each device in the system of the present invention functions collaboratively. By co-incinerating fecal sewage and sludge with pulverized coal, the resource utilization rate is significantly improved. In traditional technologies, due to the high water content (60 - 80%) of fecal sewage and sludge, the direct combustion efficiency is low, and the calorific value utilization rate is only 20 - 30%. Moreover, harmful substances such as dioxins and heavy metals are easily generated. In the present invention, through pretreatment, the water content of fecal sewage and sludge is reduced to 10 - 15%, and they are mixed with pulverized coal in a ratio of 1:4 for combustion, increasing the calorific value utilization rate to over 80%. Taking a 300MW coal-fired power unit as an example, it can process 100,000 tons of fecal sewage and sludge annually, reduce CO2 emissions by 50,000 - 80,000 tons, and save about 5 - 8 million yuan in coal combustion costs. Co-incineration not only realizes the efficient treatment of organic waste but also reduces the emissions of harmful substances generated by traditional incineration, with significant environmental and economic benefits.

[0034] The following further describes the present invention in detail with reference to the accompanying drawings:

[0035] Example 1

[0036] See Figure 1 As shown, this embodiment provides a power generation system for a coal-fired power unit coupled with fecal sewage and sludge, including a fecal sewage pretreatment system 1 and a sludge pretreatment system 4. In order to pretreat the fecal sewage and sludge from the outside, the fecal sewage enters the fecal sewage pretreatment system 1 through the fecal sewage source and is separated into waste liquid and solid substances; the sludge enters the sludge pretreatment system 4 through the sludge source and is separated into waste liquid and solid substances; the solid substances enter the drying device 8 and are used as fecal sewage fuel, and the waste liquid is used as a heating medium for drying the fecal sewage and sludge solid mixture. Specifically, the sludge is transported through a pipeline to the sludge crushing device 6. After the sludge is crushed and separated, the solid substances in the sludge enter the drying device 8 through a pipeline and enter the mixture conveying system 7 to be used as sludge fuel.

[0037] Example 2

[0038] See Figure 1 As shown, this embodiment provides a power generation system for a coal-fired power unit coupled with fecal sewage and sludge, including a mixture conveying system 7. In order to increase the calorific value and combustibility of the fecal sewage and sludge solid mixture, after the fecal sewage and sludge solid mixture is dried by the drying device 8, it is transported into the forming device 9 and is formed according to the requirements of mixing and burning with pulverized coal; the formed fecal sewage and sludge solid mixture enters the screw conveyor 11 through a pipeline, and the fecal sewage and sludge solid mixture is transported to the screw feeder 11 to achieve full mixing with the pulverized coal. Finally, the pulverized coal and the fecal sewage and sludge solid mixture are used together as the combustion medium for the boiler 15.

[0039] To prevent the blockage problem when the screw conveyor 11 conveys the fecal sewage and sludge solid mixture, a first pressurization port 10 is reserved on the screw conveyor 11. When the pipeline blockage condition occurs, an external high-pressure transfer pump is connected to dredge the pipeline under high pressure.

[0040] Embodiment 3

[0041] See Figure 1 As shown, this embodiment provides a coal-fired power generation system coupled with fecal sewage and sludge, including a pulverized coal bin 14. The pulverized coal in the pulverized coal bin 14 is transported to a screw feeder 12. After being fully mixed with the formed fecal sewage and sludge solid mixture, it is transported to a boiler 15 as a mixed combustible to generate steam. The steam is transported through a pipeline to a steam turbine 16 for power generation.

[0042] In order to recycle the waste heat generated by the flue gas of the boiler 15, it is mainly used to heat the liquid separated from the fecal sewage after being treated by the waste liquid treatment device 17 and the waste liquid generated by the sludge crushing device 6, and is used as a heat transfer medium to dry the solids separated from the fecal sewage and the solids generated by the sludge crushing device.

[0043] The present invention realizes the efficient treatment of fecal sewage and sludge, as well as the recovery and reuse of the waste heat of the coal-fired power project through the collaborative treatment of fecal sewage and sludge, reduces pollution, lowers the fuel cost, improves the energy efficiency, and solves the problem of raw material conveying blockage.

[0044] The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A coal-fired power generation system coupled with manure and sludge power generation, characterized in that, Including: A manure pretreatment system (1), a sludge pretreatment system (4), a waste liquid treatment device (17), a mixture conveying system (7), a pulverized coal bin (14), a boiler (15) and a steam turbine (16); the liquid outlets of the manure pretreatment system (1) and the sludge pretreatment system (4) are respectively connected to the inlet of the waste liquid treatment device (17); the solid outlets of the manure pretreatment system (1) and the sludge pretreatment system (4) are respectively connected to the inlet of the mixture conveying system (7); the outlet of the pulverized coal bin (14) and the outlet of the mixture conveying system (7) are joined together through a pipeline and then are successively connected to the boiler (15) and the steam turbine (16); the waste heat outlets of the boiler (15) and the steam turbine (16) are respectively connected to the waste liquid treatment device (17) through pipelines; the outlet of the waste liquid treatment device (17) is connected to the mixture conveying system (7).

2. The coal-fired power generation system coupled with manure and sludge according to claim 1, characterized in that, The manure pretreatment system (1) includes a manure receiving device (2) and a solid-liquid separation device (3) connected in sequence; the liquid outlet of the solid-liquid separation device (3) is connected to the inlet of the waste liquid treatment device (17); the solid outlet of the solid-liquid separation device (3) is connected to the inlet of the mixture conveying system (7).

3. The coal-fired power generation system coupled with manure and sludge according to claim 2, characterized in that, The inlet of the manure receiving device (2) is connected to a manure source.

4. A coal-fired power generation system coupled with manure and sludge power generation according to claim 2, wherein The sludge pretreatment system (4) includes a sludge receiving device (5) and a sludge crushing device (6) connected in sequence; the liquid outlet of the sludge crushing device (6) is connected to the inlet of the waste liquid treatment device (17); the solid outlet of the sludge receiving device (5) is connected to the inlet of the mixture conveying system (7).

5. A coal-fired power generation system coupled with manure and sludge power generation according to claim 4, characterized in that The inlet of the sludge receiving device (5) is connected to a sludge source.

6. A coal-fired power generation system coupled with manure and sludge power generation according to claim 5, characterized in that The mixture conveying system (7) includes a drying device (8), a forming device (9) and a screw conveyor (11) connected in sequence; the solid outlets of the solid-liquid separation device (3) and the sludge crushing device (6) are respectively connected to the inlet of the drying device (8); the outlet of the waste liquid treatment device (17) is connected to the drying device (8); the outlet of the screw conveyor (11) and the outlet of the mixture conveying system (7) are joined together through a pipeline and then are successively connected to the boiler (15) and the steam turbine (16).

7. A coal-fired power generation system coupled with manure and sludge power generation according to claim 6, characterized in that, A first pressure boosting port (10) is connected and arranged between the forming device (9) and the screw conveyor (11).

8. A coal-fired power generation system coupled with manure and sludge power generation according to claim 6, characterized in that, The outlet of the screw conveyor (11) and the outlet of the pulverized coal bin (14) are joined together through a pipeline and then are successively connected to the boiler (15) and the steam turbine (16) through a screw feeder (12).

9. A coal-fired power generation system coupled with manure and sludge power generation according to claim 6, characterized in that, A second pressure boosting port (13) is connected and arranged between the pulverized coal bin (14) and the screw feeder (12).

10. A method for using a power generation system that couples coal-fired power units with manure and sludge for power generation according to any one of claims 1 to 9, characterized in that, Including the following steps: The external fecal sewage and sludge are respectively transported to the fecal sewage pretreatment system (1) and the sludge pretreatment system (4) for pretreatment. The waste liquid obtained from the fecal sewage pretreatment system (1) and the sludge pretreatment system (4) is transported to the waste liquid treatment device (17), and the solid substances obtained are transported to the mixture conveying system (7) for processing and forming. Subsequently, after being mixed with the pulverized coal in the pulverized coal bin (14), they are successively fed into the boiler (15) and the steam turbine (16) for combustion power generation. During the power generation process, the waste heat generated in the boiler (15) and the steam turbine (16) enters the waste liquid treatment device (17) through the waste heat outlet, and is used to heat the waste liquid in the waste liquid treatment device (17) to provide a heating medium for the mixture conveying system (7).

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