CN216191852U - Device system for coupling sludge power generation of coal-fired unit - Google Patents

Abstract

The utility model provides a device system for coupling sludge power generation by a coal-fired unit. The device system comprises a sludge drying device, a coal-fired boiler, a heat exchange device, a first coal saving device, an air preheating device, A second coal-saving device and a desulfurization and dust removal device; the second coal-saving device is cyclically connected to the sludge drying device through the first pipeline. The device system utilizes the low-quality hot water at the outlet of the second coal-saving device as the heat source of the sludge drying device, realizes the cascade utilization of energy, has a significant energy saving effect, and keeps the temperature in the sludge drying device at a low level, Safe and reliable operation.

Description

A device system for coupling sludge power generation of coal-fired units

technical field

The utility model relates to the technical field of sludge treatment, in particular to a device system for coupling sludge power generation of coal-fired units.

Background technique

As a subsidiary product of sewage treatment in sewage treatment plants, the output of sludge is increasing. Contrary to the continuous increasing trend of sludge production, the sludge treatment and disposal capacity is insufficient and the means are outdated. The sludge contains pathogenic microorganisms, parasite eggs, toxic and harmful heavy metals and a large number of refractory substances. It directly brings secondary pollution to water, soil and atmosphere, posing a serious threat to the ecological environment.

Traditional sludge treatment methods include landfill, composting, reclamation and incineration. Improper landfill treatment may cause soil and groundwater pollution, and a large amount of land occupation will further aggravate the tension of land resources; due to the complex composition of sludge and many harmful substances, sludge composting has many difficulties in practical application. Sludge reclamation will cause harm to marine organisms and seriously pollute the marine environment. Sludge incineration is the most "thorough" sludge treatment method. It not only has fast treatment speed, but also has a high degree of reduction and can be reused. Relatively feasible sludge treatment method. The use of coal-fired power plants to mix with sludge can also treat municipal sludge in a harmless and reduced amount, and at the same time reduce the construction cost and sludge transportation cost of a new sludge treatment plant. value to generate electricity and heat.

CN112628736A discloses a sludge-coupling coal-fired generator set recycling treatment system, process and application, which sequentially pass domestic sludge and printing and dyeing sludge in industrial solid waste through a wet sludge storage and conveying system and a sludge drying system , dry sludge conveying system, coal mill, and finally put into the boiler for combustion. The treatment process of this system can not only save a lot of landfill land, eliminate the threat of secondary pollution of sludge, and realize the reduction and harmlessness of sludge disposal. , no waste gas and waste water are generated, and calorific value is generated to save coal burning. However, this treatment system directly utilizes the steam of the boiler system for sludge drying, which will affect the steam output of the unit under full load and full heating conditions, and will have a certain impact on the continuous and stable operation of the unit.

CN108083607A discloses a sludge drying coupled coal-fired power generation system, comprising: a sludge pretreatment dewatering unit for preliminary dewatering of wet sludge raw materials; a sludge pretreatment dewatering unit for drying the preliminary dewatered sludge Indirect drying unit; used to transport the dried sludge to the raw coal bunker and mixed with raw coal by airtight conveying method; mixed raw coal unit; used to preliminarily mix the sludge and raw coal, and send it to grinding coal The machine is blended and ground to make the two fully mixed, and then sent to the pulverized coal for combustion in the coal-fired boiler, which is ground and transported to the combustion unit. However, the sludge drying coupled coal-fired power generation system uses the tail flue gas filtered by the coal-fired filter or the medium and low temperature steam of the coal-fired boiler system for sludge drying and dehydration, which will make the sludge drying system operate at a relatively high temperature and cause a fire. risks of.

CN110748899A discloses a coal-fired coupled sludge drying and incineration system considering waste heat utilization, including: a sludge storage and transportation system, a sludge drying system, a sludge incineration system and a waste heat utilization system; the sludge storage and transportation system includes a wet sludge storage and transportation system. Mud silo; sludge drying system includes sludge dryer; sludge incineration system includes dry sludge silo and coal-fired boiler; sludge dryer is provided with dryer sludge inlet, dryer steam inlet, dryer The exhaust gas outlet of the dryer and the outlet of the dried sludge; the sludge outlet of the wet sludge bin is connected to the sludge inlet of the dryer of the sludge dryer; the sludge dryer is connected to the dry sludge bin through the outlet of the dried sludge; The outlet of the dry sludge bin is connected to the fuel inlet of the coal-fired boiler; the steam inlet of the dryer is connected to the steam outlet of the coal-fired boiler; the exhaust gas outlet of the dryer is connected to the waste heat utilization system. However, the system does not treat the exhaust gas and condensed water of the sludge dryer, which will lead to secondary pollution.

Therefore, it is urgent to develop a device system for coal-fired units to couple sludge power generation to effectively solve the problem of insufficient steam volume of existing coal-fired units under full load and full heating conditions and the process of coal-fired units coupled to sludge power generation. safety and reliability issues.

Utility model content

In view of the problems existing in the prior art, the present utility model provides a device system for coupling sludge power generation by a coal-fired unit, which does not use the steam of the coal-fired unit to dry the sludge, but utilizes the output of the second coal-saving device for drying. The low-quality hot water is used as the heat source of the sludge drying device to keep the temperature in the sludge drying device at a low level, and the operation is safe and reliable.

For this purpose, the utility model adopts the following technical solutions:

The utility model provides a device system for coupling sludge power generation by a coal-fired unit. The device system comprises a sludge drying device, a coal-fired boiler, a heat exchange device, a first coal saving device, an air preheating device, A second coal-saving device and a desulfurization and dust removal device; the second coal-saving device is cyclically connected to the sludge drying device through the first pipeline.

In the device system of the utility model, the second coal-saving device is cyclically connected to the sludge drying device through the first pipeline, and the sludge is dried by using the effluent of the second coal-saving device, thereby realizing the cascade utilization of energy, and the energy saving effect is remarkable. Compared with the use of the flue gas of the coal-fired boiler for sludge drying, the temperature level of the sludge drying device in the device system of the utility model is low, and the operation is safe and reliable; In terms of sludge drying by the steam of the generator set, the device system of the utility model will not affect the operation of the coal-fired boiler under full load and full heating conditions, and the coal-fired generator set coupled with the sludge power generation device is safe and stable.

Preferably, the sludge drying device includes a vacuum dryer.

Preferably, a conveying device is provided on the first pipeline.

Preferably, the heat exchange device is arranged on the top of the coal-fired boiler.

Preferably, the device system for coupling sludge power generation of the coal-fired unit further includes a steam turbine and a generator.

Preferably, the heat exchange device, the steam turbine and the first coal economizer are connected in sequence.

Preferably, the steam turbine is connected coaxially with the generator.

Preferably, the steam turbine, the second economizer and the first economizer are connected in sequence.

Preferably, the device system for coupling sludge power generation of the coal-fired unit further includes a gas-solid separation device and a condensation device.

Preferably, the sludge drying device, the gas-solid separation device, the condensing device and the coal-fired boiler are connected in sequence.

Preferably, the gas-solid separation device is connected to the coal-fired boiler through a second pipeline.

The solid particles separated by the gas-solid separation device of the utility model and the odor generated by the sludge drying device enter the coal-fired boiler through the second pipe for full combustion, and then pass through the heat exchange device together with the flue gas generated by the coal-fired boiler. , The first coal-saving device, the air preheating device and the second coal-saving device conduct heat exchange, and finally pass through the desulfurization and dust removal device to reach the standard and discharge, which will not pollute the environment.

Preferably, the device system of the coal-fired unit coupled to the sludge for power generation further includes a sewage treatment device connected to the condensation device through a condensate water pipeline.

The effluent water of the condensation device of the utility model enters the sewage treatment device for treatment, and the treated water up to the standard is comprehensively utilized in the field to realize zero discharge of waste water.

Preferably, the device system for coupling sludge power generation of the coal-fired unit further includes a cooling device cyclically connected to the condensing device.

Preferably, the device system of the coal-fired unit coupled with the sludge for power generation further includes a chimney connected to the desulfurization and dust removal device.

Preferably, the device system for coupling sludge power generation of the coal-fired unit further includes a sludge storage device and a sludge conveying device; the sludge conveying device, the sludge storage device and the sludge drying device are connected in sequence.

The use method of the device system of the coal-fired unit coupling sludge power generation provided by the utility model includes the following steps:

After the wet sludge is processed by the sludge drying device, dried sludge is obtained. The dried sludge enters the coal-fired boiler for combustion, and the generated flue gas passes through the heat exchange device, the first coal-saving device, and air preheating in sequence. After heat exchange between the device and the second coal-saving device, it enters the desulfurization and dust removal device for treatment and discharge; part of the effluent from the second coal-saving device enters the first coal-saving device, and the other part enters the sludge drying device to dry the wet sludge. The effluent from the drying unit is returned to the second coal economizer for circulation.

The method of the utility model considers that the second coal-saving device in the coal-fired unit is a flue gas deep waste heat utilization device, and the temperature of the effluent of the second coal-saving device is 85-95°C, and the sludge drying device needs The temperature of the inlet water is just 85-95°C, and the temperature of the outlet water after drying the sludge is reduced to 65-75°C, which can be used as the inlet water of the second coal-saving device to exchange heat with the flue gas. The utility model utilizes the perfect fit between the inlet and outlet water temperatures of the sludge drying device and the inlet and outlet water temperatures of the second coal-saving device, thereby realizing the perfect coupling of the coal-fired generator set and the sludge drying device.

Specifically, the use method of the device system of the coal-fired unit coupling sludge power generation provided by the present invention includes the following steps:

After the wet sludge with a moisture content of 75% to 85% is processed by a sludge drying device, a dried sludge with a moisture content of 35% to 45% is obtained, and the dried sludge enters the coal-fired boiler for combustion to produce After the flue gas is heated by the heat exchange device, the first coal saving device, the air preheating device and the second coal saving device in turn, it enters the desulfurization and dust removal device for treatment and is discharged; the temperature of the second coal saving device is 85-95 °C. Part of the effluent enters the first coal-saving device, and the other part enters the sludge drying device to dry the wet sludge. The effluent from the sludge drying device with a temperature of 65-75°C returns to the second coal-saving device for circulation; the heat exchange device The generated steam enters the steam turbine to do work, and drives the generator to generate electricity; the gas generated by the sludge drying device enters the gas-solid separation device for separation, and the solid particles discharged from the bottom of the gas-solid separation device enter the coal-fired boiler for combustion, so The gas discharged from the top of the gas-solid separation device enters the condensing device to be condensed, and then enters the sewage treatment device for treatment.

Compared with the prior art, the present utility model at least has the following beneficial effects:

(1) The device system of the coal-fired unit coupling sludge power generation provided by the utility model connects the second coal-saving device and the sludge drying device cyclically, and utilizes the effluent of the second coal-saving device to dry the sludge, thereby realizing energy Cascade utilization, significant energy-saving effect, and low temperature level of sludge drying device, lower than 100 ℃, safe and reliable operation;

(2) The coal-fired unit coupling sludge power generation device system provided by the utility model does not affect the operation of the coal-fired boiler under full load and full heating conditions, and the coal-fired unit coupling sludge power generation device is safe and stable;

(3) The coal-fired unit coupling sludge power generation device system provided by the utility model reduces the energy consumption of the sludge drying device, and the odor generated during the sludge drying process is fully burned in the coal-fired boiler, and the flue gas is passed through. The disposal of up-to-standard discharge has no secondary pollution to the environment, and has good economic and environmental benefits.

Description of drawings

FIG. 1 is a schematic diagram of a device system for a coal-fired unit coupled to sludge power generation provided in a specific embodiment of the present invention.

In the picture: 1-closed sludge transporter; 2-sludge storage bin; 3-plunger pump; 4-sludge dryer; 5-coal-fired boiler; 6-air preheater; 7-second province Coal collector; 8- Desulfurization and dust removal device; 9- Chimney; 10- Steam turbine; 11- Generator; 12- Water pump; 13- Cyclone dust collector; 14- Condenser; 15- Cooling tower; 16- Sewage treatment device; 17- The first economizer; 18-heat exchange device; 19-first pipeline; 20-second pipeline; 21-condensate pipeline.

Detailed ways

The technical solutions of the present utility model will be further described below with reference to the accompanying drawings and through specific embodiments.

The present utility model is described in further detail below. However, the following examples are only simple examples of the present utility model, and do not represent or limit the protection scope of the present utility model. The protection scope of the present utility model is subject to the claims.

It should be understood that in the description of the present invention, the terms "center", "longitudinal", "horizontal", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention The novel and simplified description does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", etc., may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

It should be noted that, in the description of the present utility model, unless otherwise expressly specified and limited, the terms "arrangement", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

It should be understood by those skilled in the art that the present utility model must include necessary pipelines, conventional valves and general pump equipment for realizing the complete process, but the above contents do not belong to the main utility model points of the present utility model, and those skilled in the art can Based on the technological process and equipment structure selection, the layout can be added by itself, and the present invention does not make special requirements and specific limitations on this.

Example 1

This embodiment provides a device system for coupling sludge power generation by a coal-fired unit, the schematic diagram of which is shown in FIG. 1 , the device system includes a sludge dryer 4, a coal-fired boiler 5, a heat exchange device 18, The first economizer 17 , the air preheater 6 , the second economizer 7 and the desulfurization and dust removal device 8 ; the second economizer 7 is cyclically connected to the sludge dryer 4 through the first pipeline 19 .

The first pipe 19 is provided with a water pump 12; the heat exchange device 18 is arranged on the top of the coal-fired boiler 5; the device system further includes a steam turbine 10 and a generator 11; the heat exchange device 18, the steam turbine 10 and The first economizers 17 are connected in sequence; the steam turbine 10 and the generator 11 are coaxially connected. The steam turbine 10, the second economizer 7 and the first economizer 17 are connected in sequence.

The device system also includes a cyclone 13, a condenser 14, a cooling tower 15, a closed sludge conveying vehicle 1 and a sewage treatment device 16; the sludge dryer 4, the cyclone 13, the condenser 14 and the combustion The coal boilers 5 are connected in sequence; the cyclone 13 is connected with the coal-fired boiler 5 through the second pipe 20 . The cooling tower 15 is cyclically connected to the condenser 14 ; the condenser 14 is connected to the sewage treatment device 16 through the condensed water pipeline 21 . The device system for coupling sludge power generation of the coal-fired unit also includes a chimney 9 connected to the desulfurization and dust removal device 8, a sludge storage bin 2 and a plunger pump 3 connected to the sludge dryer 4 in sequence; The sludge conveying vehicle 1 is transported to the sludge storage bin 2 .

This embodiment also provides a method for coupling sludge power generation of a coal-fired unit. The method is performed using the above-mentioned device system, and includes the following steps:

After the wet sludge with a moisture content of 80% is transported to the sludge storage bin 2 by the closed sludge conveying vehicle 1, it is transported to the sludge dryer 4 by the plunger pump 3 for drying treatment, and the sludge with a moisture content of 40% is obtained. The dried sludge enters the coal-fired boiler 5 for combustion, and the generated flue gas is sequentially exchanged by the heat exchange device 18 , the first economizer 17 , the air preheater 6 and the second economizer 7 After being heated, it enters the desulfurization and dust removal device 8 for treatment, and then is discharged through the chimney 9; part of the effluent from the second economizer 7 with a temperature of 90°C enters the first economizer 17, and the other part enters the sludge dryer through the first pipeline 19. 4. To dry the wet sludge, the effluent of the sludge dryer with a temperature of 70°C returns to the second economizer 7 for circulation; the steam generated by the heat exchange device 18 enters the steam turbine 10 to do work, and drives the generator 11 to generate electricity; The gas generated by the sludge dryer 4 enters the cyclone 13 for separation, and the solid particles discharged from the bottom of the cyclone 13 enter the coal-fired boiler 5 through the second pipe 20 for combustion. The top of the cyclone 13 The exhausted gas enters the condenser 14 to be condensed, and then enters the sewage treatment device 16 through the condensed water pipeline 21 for treatment.

Example 2

This embodiment provides an apparatus system for coupling sludge power generation of a coal-fired unit, and the apparatus system is the same as that of Embodiment 1.

This embodiment also provides a method for coupling sludge power generation of a coal-fired unit. The method is performed using the above-mentioned device system, and includes the following steps:

The wet sludge with a moisture content of 75% is transported to the sludge storage bin by a closed sludge conveying vehicle, and then transported to a sludge dryer for drying treatment by a plunger pump to obtain a dried sludge with a moisture content of 45%. , the dried sludge enters the coal-fired boiler for combustion, and the generated flue gas passes through the heat exchange device, the first economizer, the air preheater and the second economizer in turn, and then enters the desulfurization and dust removal device for treatment. , discharged through the chimney; part of the effluent of the second economizer with a temperature of 85 °C enters the first economizer, and the other part enters the sludge dryer through the first pipeline to dry the wet sludge, and the sludge with a temperature of 65 °C The effluent water of the dryer returns to the second economizer for circulation; the steam generated by the heat exchange device enters the steam turbine to do work, and drives the generator to generate electricity; the gas generated by the sludge dryer enters the cyclone for separation, and the The solid particles discharged from the bottom of the cyclone dust collector enter the coal-fired boiler for combustion through the second pipeline, and the gas discharged from the top of the cyclone dust collector enters the condenser for condensation, and then enters the sewage treatment device through the condensed water pipeline for treatment.

Example 3

This embodiment provides an apparatus system for coupling sludge power generation of a coal-fired unit, and the apparatus system is the same as that of Embodiment 1.

This embodiment also provides a method for coupling sludge power generation of a coal-fired unit. The method is performed using the above-mentioned device system, and includes the following steps:

After the wet sludge with a moisture content of 85% is transported to the sludge storage bin by a closed sludge conveying vehicle, it is transported to a sludge dryer by a plunger pump for drying treatment, and a dried sludge with a moisture content of 35% is obtained. , the dried sludge enters the coal-fired boiler for combustion, and the generated flue gas passes through the heat exchange device, the first economizer, the air preheater and the second economizer in turn, and then enters the desulfurization and dust removal device for treatment. , discharged through the chimney; part of the effluent of the second economizer with a temperature of 95 ℃ enters the first economizer, and the other part enters the sludge dryer through the first pipeline to dry the wet sludge, and the sludge with a temperature of 75 ℃ The effluent water of the dryer returns to the second economizer for circulation; the steam generated by the heat exchange device enters the steam turbine to do work, and drives the generator to generate electricity; the gas generated by the sludge dryer enters the cyclone for separation, and the The solid particles discharged from the bottom of the cyclone dust collector enter the coal-fired boiler for combustion through the second pipeline, and the gas discharged from the top of the cyclone dust collector enters the condenser for condensation, and then enters the sewage treatment device through the condensed water pipeline for treatment.

It can be seen from the comprehensive examples 1 to 3 that the device system of the coal-fired unit coupling sludge power generation provided by the utility model uses the effluent of the second economizer as the heat source of the sludge dryer to dry the wet sludge, and the sludge is dried. The effluent water from the dryer returns to the second economizer for circulation, absorbs heat again, and then heats the wet sludge. The inlet water temperature of the sludge dryer perfectly matches the inlet and outlet water temperature of the second economizer, and there will be no heat waste. Or the problem of needing additional supplementary heat, so as to realize the perfect coupling of the coal-fired generator set and the sludge dryer. And the temperature of the whole set of sludge drying machine is within 100 ℃, the system operation is safe and reliable.

Comparative Example 1

This comparative example provides a device system for coupling sludge power generation with coal-fired units. The device system for coupling sludge power generation with coal-fired units excludes "the second economizer is not cyclically connected to the sludge dryer, and the flue gas is installed. The bypass pipeline is connected to the coal-fired boiler and the water supply device, and the water supply device is connected to the sludge drying device through the water supply pipeline”, the rest are the same as in Example 1.

This comparative example also provides a method for coupling sludge power generation by a coal-fired unit. The method is carried out using the above-mentioned device system, and includes the following steps:

After the wet sludge with a moisture content of 80% is processed by a sludge dryer, a dried sludge with a moisture content of 40% is obtained, and the dried sludge enters the coal-fired boiler for combustion. After the heat exchange of the heat device, the first economizer, the air preheating device and the second economizer, it enters the desulfurization and dust removal device for treatment, and a part of the flue gas is heated by the flue gas bypass to heat the feed water, and the heated feed water enters the sludge drying. The machine dries the wet sludge, and the other part is discharged through the chimney. The effluent of the second economizer with a temperature of 90°C enters the first economizer, the steam generated by the heat exchange device enters the steam turbine to do work, and drives the generator to generate electricity; the gas generated by the sludge dryer enters the gas-solid The separation device performs separation, the solid particles discharged from the bottom of the gas-solid separation device enter the coal-fired boiler for combustion, and the gas discharged from the top of the gas-solid separation device enters the condensing device for condensation, and then enters the sewage treatment device for treatment.

Comparative Example 2

This comparative example provides a device system for coupling sludge power generation with a coal-fired unit, the device system for coupling sludge power generation with a coal-fired unit except that "the second economizer is not cyclically connected to the sludge dryer, and is provided with heating Except that the return water pipeline is connected to the sludge drying device", the rest are the same as in Example 1.

This comparative example also provides a method for coupling sludge to generate electricity from a coal-fired unit. The method is carried out using the above-mentioned device system. Others are the same as in Example 1.

It can be seen from the comprehensive comparative examples 1 to 2 that the feed water heated by the flue gas bypass or the return water of the heating system enters the sludge dryer to dry the wet sludge, which will cause the temperature of the sludge dryer to be high and cause fires to occur. risks of.

To sum up, the utility model provides a device system for coal-fired units coupled with sludge power generation, which utilizes the low-quality hot water at the outlet of the second coal-saving device as the heat source of the sludge drying device, thereby realizing the cascade utilization of energy and the effect of energy saving. At the same time, the temperature level in the sludge drying device is kept low, and the operation is safe and reliable.

The applicant declares that the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Those skilled in the art should Changes or substitutions that can be easily conceived within the technical scope disclosed by the new model all fall within the protection scope and disclosure scope of the present invention.

Claims (10)

1. A device system for coupling a coal-fired unit and generating power by sludge is characterized by comprising a sludge drying device, a coal-fired boiler, a heat exchange device, a first coal-saving device, an air preheating device, a second coal-saving device and a desulfurization and dust removal device which are sequentially connected; the second coal-saving device is circularly connected with the sludge drying device through the first pipeline.

2. The coal-fired unit-coupled sludge power generation plant system as claimed in claim 1, wherein the sludge drying device comprises a vacuum drier.

3. The coal-fired unit-coupled sludge power generation plant system according to claim 1, wherein the first pipeline is provided with a conveying device.

4. The coal-fired unit-coupled sludge power generation plant system as claimed in claim 1, wherein the heat exchange device is arranged at the top of the coal-fired boiler.

5. The coal-fired unit-coupled sludge power generation plant system according to claim 1, further comprising a steam turbine and a generator;

the heat exchange device, the steam turbine and the first coal saving device are sequentially connected;

the steam turbine is coaxially connected with the generator;

the steam turbine, the second coal saving device and the first coal saving device are connected in sequence.

6. The coal-fired unit-coupled sludge power generation device system as claimed in claim 1, wherein the coal-fired unit-coupled sludge power generation device system further comprises a gas-solid separation device and a condensation device;

the sludge drying device, the gas-solid separation device, the condensing device and the coal-fired boiler are sequentially connected;

the gas-solid separation device is connected with the coal-fired boiler through a second pipeline.

7. The coal-fired unit-coupled sludge power generation plant system according to claim 6, further comprising a sewage treatment plant connected with the condensing plant through a condensed water pipe.

8. The coal-fired unit-coupled sludge power generation plant system according to claim 6, further comprising a cooling device in circulating connection with the condensing device.

9. The coal-fired unit-coupled sludge power generation plant system according to claim 1, further comprising a chimney connected to the desulfurization and dust removal device.

10. The coal-fired unit-coupled sludge power generation plant system according to claim 1, further comprising a sludge storage device and a sludge conveying device; the sludge conveying device, the sludge storage device and the sludge drying device are sequentially connected.

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