Municipal sludge drying and incineration integrated system and method utilizing waste heat of power plant

Abstract

The invention discloses a municipal sludge drying and incineration integrated system and method utilizing waste heat of a power plant, and the municipal sludge drying and incineration integrated system comprises a boiler system and a heat exchange system, the boiler system comprises a smoke exhaust pipeline and an air heater, and the smoke exhaust pipeline is provided with a first heat exchanger and a second heat exchanger which are arranged in the flowing direction of smoke; according to the sludge drying system, a bubbling bed drying device is provided with a buried pipe and an air chamber; the first air supply pipeline is communicated with an inlet of the air chamber and an air outlet of the air heater; heat exchange fluid is arranged in the first circulating pipeline, and the buried pipe and the cold side of the first heat exchanger are connected to the first circulating pipeline in series; heat exchange fluid is arranged in the second circulation pipeline, and the air heater and the cold side of the second heat exchanger are connected to the second circulation pipeline in series. According to the municipal sludge drying and incineration integrated system, flue gas waste heat can be recycled more sufficiently, and the municipal sludge drying and incineration integrated system is better in integration and more compact, so that the municipal sludge drying and incineration integrated system can operate more efficiently and stably.

Description

Technical Field

[0001] The present invention relates to the technical field of harmless treatment of municipal sludge, and in particular to an integrated system and method for drying and incinerating municipal sludge by using waste heat from a power plant. Background Art

[0002] With the continuous acceleration of the urbanization process and the rapid increase in the urban population, the generation amount of municipal sludge has increased sharply. Since municipal sludge contains heavy metals, pathogens, microbial pollutants, persistent organic pollutants, and some other toxic and harmful inorganic compounds, it is likely to cause serious environmental pollution problems and needs to be properly treated in an appropriate way.

[0003] At present, the method of combining the treatment of municipal sludge with the boiler system of a power plant can utilize the existing flue gas purification device to treat the combustion pollutants of municipal sludge, thereby reducing the investment cost and operating cost of the municipal sludge treatment project equipment, and enabling the municipal sludge treatment technology to be better promoted and developed. In the related technology, the system formed by the equipment system for treating municipal sludge and the boiler system of the power plant has poor system integration, the overall structure is relatively scattered, and there is a lack of effective connection between sludge treatment and boiler combustion, resulting in poor overall operation performance of the system. Moreover, when using the waste heat of the flue gas discharged from the boiler for sludge drying, the utilization of the waste heat of the flue gas is not sufficient. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides an integrated system for drying and incinerating municipal sludge by using waste heat from a power plant. The integrated system for drying and incinerating municipal sludge can improve the overall system integration of the drying and incineration of municipal sludge and the boiler system, make the overall structure of the integrated system for drying and incinerating municipal sludge more compact and have better operation performance, and enable the waste heat of the flue gas of the boiler to be more fully recovered and utilized.

[0005] The present invention also provides a method for drying and incinerating municipal sludge applied to the above-mentioned integrated system for drying and incinerating municipal sludge by using waste heat from a power plant.

[0006] The integrated municipal sludge drying and incineration system using the waste heat of a power plant according to the first aspect of the present invention includes: a boiler system, the boiler system includes a flue gas exhaust pipeline and a warm air heater, and the flue gas exhaust pipeline is provided with a first heat exchanger and a second heat exchanger arranged in sequence along the flow direction of the flue gas; a sludge drying system, the sludge drying system includes: a bubbling bed drying device, the bubbling bed drying device is provided with buried pipes and an air chamber, and the bubbling bed drying device is adapted to convey the dried sludge to the boiler system for combustion; a first air supply pipeline, the first air supply pipeline is connected to the inlet of the air chamber and the outlet of the warm air heater; a first circulation pipeline, the first circulation pipeline is provided with a heat exchange fluid, and the buried pipes and the cold side of the first heat exchanger are connected in series on the first circulation pipeline; a second circulation pipeline, the second circulation pipeline is provided with a heat exchange fluid, and the warm air heater and the cold side of the second heat exchanger are connected in series on the second circulation pipeline.

[0007] The integrated municipal sludge drying and incineration system using the waste heat of a power plant according to the present invention, by setting a boiler system and a sludge drying system, the boiler system is provided with a first heat exchanger and a second heat exchanger, the sludge drying system is provided with a first air supply pipeline, a first circulation pipeline and a second circulation pipeline, the cold side of the first heat exchanger and the buried pipes are connected in series on the first circulation pipeline, the warm air heater and the cold side of the second circulation pipeline are connected in series on the second circulation pipeline, and the first air supply pipeline is connected to the inlet of the air chamber and the outlet of the warm air heater. The structure is simple, so that the waste heat of the flue gas of the boiler system can be more fully and reasonably recovered and utilized, and the integrated municipal sludge drying and incineration system using the waste heat of a power plant has better integration and is more compact, so that the integrated municipal sludge drying and incineration system using the waste heat of a power plant can operate more efficiently and stably.

[0008] In some embodiments of the present invention, the bubbling bed drying device is provided with a drying chamber, the sludge drying system further includes a granulator, the outlet of the granulator is connected to the inlet of the drying chamber, the granulator is used for crushing the municipal sludge entering the drying chamber, and the granulator is configured to crush the municipal sludge into particle clusters with a particle size less than or equal to 30 mm.

[0009] In some embodiments of the present invention, the sludge drying system further includes: an exhaust gas pipeline, the exhaust gas pipeline is connected to the exhaust port of the bubbling bed drying device; a condenser, the hot side of the condenser is connected in series on the exhaust gas pipeline; a heat exchange pipeline, the integrated municipal sludge drying and incineration system using the waste heat of a power plant further includes a steam turbine system, the steam turbine system is provided with a condensate pipeline and a condenser, the condensate pipeline is used for conveying the condensate from the condenser to the boiler system, the inlet end and the outlet end of the heat exchange pipeline are both connected to the condensate pipeline, wherein, the inlet end of the heat exchange pipeline is located upstream of the outlet end in the flow direction of the fluid in the condensate pipeline, and the cold side of the condenser is connected in series on the heat exchange pipeline.

[0010] In an embodiment of the present invention, the sludge drying system further includes a dust removal device, and the dust removal device is connected in series to the exhaust gas pipeline and is located upstream of the condenser in the gas flow direction in the exhaust gas pipeline.

[0011] In some examples of the present invention, the boiler system further includes: a coal mill and a boiler, the coal mill is adapted to convey pulverized coal to the boiler, and the sludge drying system further includes: a first feeding pipe, the first feeding pipe is connected to the dust discharge port of the dust removal device and the feeding port of the coal mill; a second feeding pipe, the second feeding pipe is connected to the discharge port of the bubbling bed drying device and the feeding port of the coal mill.

[0012] In an example of the present invention, the sludge drying system further includes: a first blower and a reflux pipe, the reflux pipe is connected to the exhaust port of the condenser and the feeding port of the coal mill, and the first blower is used to drive the air flow to flow along the reflux pipe to the feeding port of the coal mill.

[0013] In some specific embodiments of the present invention, the sludge drying system further includes a gas mixing device, the outlet of the gas mixing device is connected to the feeding port of the coal mill, and the reflux pipe is connected to and communicated with the inlet of the gas mixing device.

[0014] In a specific embodiment of the present invention, the sludge drying system further includes a second air supply pipeline, the boiler system further includes an air preheater, the second air supply pipeline is connected to the air outlet of the air heater and the inlet of the gas mixing device, and the cold side of the air preheater is connected in series to the second air supply pipeline.

[0015] According to the method for municipal sludge drying and incineration using waste heat of a power plant in the second aspect of the present invention, which is used for the integrated system for municipal sludge drying and incineration using waste heat of a power plant in the first aspect of the present invention, the method for municipal sludge drying and incineration using waste heat of a power plant includes: crushing municipal sludge and feeding it into a bubbling bed drying device for drying; conveying the dried sludge to a boiler for combustion; performing two-stage waste heat recovery on the flue gas of the boiler system, wherein the primary waste heat is conveyed to the bubbling bed drying device to dry the sludge, and the secondary waste heat is conveyed to the air heater; the gas heated by the air heater is conveyed to the air chamber of the bubbling bed drying device; the gas discharged from the bubbling bed drying device is dust-removed and condensed, and the obtained dust and gas are sent to the boiler for combustion.

[0016] According to the method for municipal sludge drying and incineration using the waste heat of a power plant of the present invention, through the integrated system for municipal sludge drying and incineration using the waste heat of a power plant for the above first aspect, by performing two-stage waste heat recovery on the flue gas discharged from the boiler system, the primary waste heat is transported to the bubbling bed drying device to dry the sludge, and the secondary waste heat is transported to the air preheater. The gas heated by the air preheater is transported to the air chamber of the bubbling bed drying device. The structure is simple, enabling more sufficient and reasonable recovery and utilization of the flue gas waste heat of the boiler system, and making the integrated system for municipal sludge drying and incineration using the waste heat of a power plant more integrated and compact. Thus, the integrated system for municipal sludge drying and incineration using the waste heat of a power plant can operate more efficiently and stably.

[0017] In some embodiments of the present invention, the gas discharged from the bubbling bed drying device is dust-removed and condensed, including: the gas discharged from the bubbling bed drying device is dust-removed; the dust-removed gas is condensed using the condensate from the condenser.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Brief Description of the Drawings

[0019] Figure 1 is a schematic diagram of an integrated system for municipal sludge drying and incineration using the waste heat of a power plant according to an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the process of a method for municipal sludge drying and incineration using the waste heat of a power plant according to an embodiment of the present invention.

[0021] Reference Signs:

[0022] 11, granulator;

[0023] 12, bubbling bed drying device; 121, immersed tube;

[0024] 13, gas mixing device; 14, dust removal device; 15, condenser; 16, first fan;

[0025] 171, first air supply pipeline; 172, second air supply pipeline; 173, first circulation pipeline; 174, second circulation pipeline; 175, exhaust pipeline; 176, heat exchange pipeline;

[0026] 181, first feeding pipe; 182, second feeding pipe; 183, reflux pipe;

[0027] 21, flue gas pipeline; 22, first heat exchanger; 23, second heat exchanger; 24, air preheater; 25, coal mill; 26, air preheater; 27, boiler; 28, low-pressure heater;

[0028] 31. Condenser; 32. Condensate pipe line;

[0029] 100. Municipal sludge drying and incineration integrated system. Specific embodiments

[0030] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] Reference is made below to Figure 1 Describe the municipal sludge drying and incineration integrated system 100 using the waste heat of a power plant according to an embodiment of the first aspect of the present invention.

[0032] As Figure 1 shown, the municipal sludge drying and incineration integrated system 100 using the waste heat of a power plant according to an embodiment of the first aspect of the present invention includes: a boiler system and a sludge drying system.

[0033] Specifically, the boiler system includes a flue gas exhaust pipe line 21 and a warm air heater 24. The flue gas exhaust pipe line 21 is provided with a first heat exchanger 22 and a second heat exchanger 23 arranged in sequence along the flow direction of the flue gas; the sludge drying system includes: a bubbling bed drying device 12, a first air supply pipe line 171, a first circulation pipe line 173 and a second circulation pipe line 174. The bubbling bed drying device 12 is provided with a buried pipe 121 and an air chamber. The bubbling bed drying device 12 is adapted to convey the dried sludge to the boiler system for combustion; the first air supply pipe line 171 is connected to the inlet of the air chamber and the outlet of the warm air heater 24; a heat exchange fluid is provided in the first circulation pipe line 173, and the buried pipe 121 and the cold side of the first heat exchanger 22 are connected in series on the first circulation pipe line 173; a heat exchange fluid is provided in the second circulation pipe line 174, and the warm air heater 24 and the cold side of the second heat exchanger 23 are connected in series on the second circulation pipe line 174.

[0034] In this embodiment, the integrated municipal sludge drying and incineration system 100 using the waste heat of a power plant includes a boiler system and a sludge drying system. The boiler system is used to heat water to generate steam for the operation of a steam turbine system to generate electricity, and the sludge drying system is used for drying municipal sludge. The boiler system includes a flue gas pipeline 21 and a warm air heater 24. The flue gas pipeline 21 is provided with a first heat exchanger 22 and a second heat exchanger 23 arranged in sequence along the flow direction of the flue gas. The cold side of the first heat exchanger 22 and the buried pipes 121 of the bubbling bed drying device 12 are connected in series on the first circulation pipeline 173. The structure is simple. The heat exchange fluid in the first circulation pipeline 173 can exchange heat with the flue gas at the first heat exchanger 22. After heat exchange, the heated heat exchange fluid flows along the first circulation pipeline 173 into the buried pipes 121, so as to heat and dry the sludge in the bubbling bed drying device 12, and the waste heat of the flue gas is well recovered and utilized.

[0035] The boiler system is provided with a warm air heater 24. The warm air heater 24 can provide a conveying air with a certain temperature for the conveying of pulverized coal in the boiler system, so that the pulverized coal at the outlet of the coal mill 25 forms a pulverized coal air flow and flows into the burner and then enters the boiler 27 to participate in combustion, thus meeting the operation requirements of the boiler system.

[0036] In this embodiment, the cold side of the second heat exchanger 23 and the warm air heater 24 are connected in series on the second circulation pipeline 174. The heat exchange fluid in the second circulation pipeline 174 can exchange heat with the flue gas at the second heat exchanger 23. After heat exchange, the heated heat exchange fluid flows along the second circulation pipeline 174 into the warm air heater 24, so that the warm air heater 24 can use the heat of the heat exchange fluid to heat the gas, thus heating the air flow for conveying pulverized coal. At the same time, the heated gas flows along the first air supply pipeline 171 into the air chamber, and can be used for the fluidization operation of the bubbling bed drying device 12. The fluidization air at a higher temperature can well improve the drying efficiency of the municipal sludge in the bubbling bed drying device 12.

[0037] In this embodiment, the waste heat of the flue gas is used for heating at the buried pipes 121 of the bubbling bed drying device 12 and heating the fluidization air, so that the drying effect and efficiency of the municipal sludge during the operation of the bubbling bed drying device 12 are better, and the drying of the municipal sludge does not require additional heat sources for heating, thus well reducing the operation cost of the sludge drying system and making more full use of the heat energy of the boiler system.

[0038] In this embodiment, the bubbling bed drying device 12 is adapted to convey the dried sludge to the boiler system for combustion, which can well reduce the impact of the sludge participating in combustion on the combustion performance of the boiler 27. At the same time, after the sludge burns in the boiler system, the harmful gases generated by combustion can be directly purified by the flue gas purification device of the boiler system, so that the setting of the flue gas purification device in the sludge drying system can be omitted, thereby reducing the cost investment of the sludge drying system, and reducing the overall number of devices of the municipal sludge drying and incineration integrated system 100 using the waste heat of the power plant, and making the overall structure simpler.

[0039] In this embodiment, the first heat exchanger 22 and the second heat exchanger 23 are provided to recover the waste heat of the flue gas in two stages, which can make the waste heat of the flue gas be recovered and utilized more fully. It can be understood that the heat contained in the flue gas after heat exchange in the first heat exchanger 22 is reduced, so that the heat obtained by the heat exchange fluid in the second circulation pipeline 174 at the second heat exchanger 23 is small and the temperature is low. In this embodiment, the waste heat obtained by the first heat exchanger 22 is used to heat the municipal sludge at the buried pipe 121, and the waste heat obtained by the second heat exchanger 23 is used to heat the fluidizing air supplied to the air chamber, so that the bubbling bed drying device 12 can operate efficiently, and thus the waste heat of the flue gas can be utilized more fully and reasonably.

[0040] In this embodiment, the sludge drying system is provided with a first air supply pipeline 171, a first circulation pipeline 173 and a second circulation pipeline 174. The first air supply pipeline 171 is connected to the air preheater 24 in the boiler system and cooperates to recover the waste heat of the flue gas. The first circulation pipeline 173 is connected to the first heat exchanger 22 in the boiler system and cooperates to recover and utilize the waste heat of the flue gas. The second circulation pipeline 174 is connected to the second heat exchanger 23 in the boiler system and cooperates to recover and utilize the waste heat of the flue gas. The structure is simple, which organically combines the sludge drying system with the boiler system, and enables the operation of the sludge drying system to be well connected with the operation of the boiler system, so that the integration of the municipal sludge drying and incineration integrated system 100 using the waste heat of the power plant is better, and the overall structure can be more compact, so that the municipal sludge drying and incineration integrated system 100 using the waste heat of the power plant can operate more efficiently and stably.

[0041] According to the integrated municipal sludge drying and incineration system 100 using the waste heat of a power plant according to an embodiment of the present invention, by setting a boiler system and a sludge drying system, the boiler system is provided with a first heat exchanger 22 and a second heat exchanger 23, the sludge drying system is provided with a first air supply pipeline 171, a first circulation pipeline 173 and a second circulation pipeline 174. The cold side of the first heat exchanger 22 and the buried pipe 121 are connected in series on the first circulation pipeline 173, and the air preheater 24 and the cold side of the second circulation pipeline 174 are connected in series on the second circulation pipeline 174. The first air supply pipeline 171 is communicated with the inlet of the air chamber and the outlet of the air preheater 24. The structure is simple, so that the flue gas waste heat of the boiler system can be more fully and reasonably recovered and utilized, and the integrated municipal sludge drying and incineration system 100 using the waste heat of the power plant has better integration and is more compact, so that the integrated municipal sludge drying and incineration system 100 using the waste heat of the power plant can operate more efficiently and stably.

[0042] In some embodiments of the present invention, as Figure 1 shown, the bubbling bed drying device 12 is provided with a drying chamber. The sludge drying system may further include a granulator 11. The outlet of the granulator 11 is communicated with the inlet of the drying chamber. The granulator 11 is used for crushing the municipal sludge entering the drying chamber, and the granulator 11 is configured to crush the municipal sludge into particle clusters with a particle size less than or equal to 30 mm.

[0043] In this embodiment, the sludge drying system is further provided with a granulator 11. The outlet of the granulator 11 is communicated with the inlet of the drying chamber. The granulator 11 is used for crushing the sludge entering the drying chamber. The structure is simple and the layout is reasonable, so that the municipal sludge can be crushed and then heated and dried in the drying chamber of the bubbling bed drying device 12. Thus, the heat receiving area of the municipal sludge and the escape voids of water vapor and the like are well increased, so that the municipal sludge can be heated, dried and crushed more evenly and aggregation and caking are well prevented, so that the municipal sludge can be dried more quickly and the drying efficiency of the bubbling bed drying device 12 is higher.

[0044] In this embodiment, the granulator 11 is configured to crush the municipal sludge into particle clusters with a particle size less than or equal to 30 mm, so that the volume of the particle clusters formed by the municipal sludge entering the drying chamber is small. After the municipal sludge is crushed, the drying efficiency can be stably improved, and the situation that the sludge drying efficiency is not significantly improved due to too large particle size is avoided, so that the granulator 11 can stably achieve a good use effect, and thus the sludge drying system can operate more stably and efficiently. For example, the particle size of the crushed municipal sludge can be 30 mm, 28 mm, 25 mm, 21 mm, etc.

[0045] In some embodiments of the present invention, as Figure 1As shown, the sludge drying system may further include: an exhaust pipe 175, a condenser 15, and a heat exchange pipe 176. The exhaust pipe 175 is connected to the exhaust port of the bubbling bed drying device 12; the hot side of the condenser 15 is connected in series on the exhaust pipe 175; the integrated municipal sludge drying and incineration system 100 using the waste heat of the power plant further includes a steam turbine system. The steam turbine system is provided with a condensate pipe 32 and a condenser 31. The condensate pipe 32 is used to convey the condensate from the condenser 31 to the boiler system. The inlet end and the outlet end of the heat exchange pipe 176 are both communicated with the condensate pipe 32. Wherein, the inlet end of the heat exchange pipe 176 is located upstream of the outlet end in the fluid flow direction of the condensate pipe 32, and the cold side of the condenser 15 is connected in series on the heat exchange pipe 176.

[0046] In this embodiment, the sludge drying system includes an exhaust pipe 175, a condenser 15, and a heat exchange pipe 176. The exhaust pipe 175 is connected to the exhaust port of the bubbling bed drying device 12. The heat exchange pipe 176 is communicated with the condensate pipe 32. The hot side of the condenser 15 is connected in series on the exhaust pipe 175. The cold side of the condenser 15 is connected in series on the heat exchange pipe 176. The structure is simple, enabling the condensate in the condensate pipe 32 to exchange heat with the exhaust gas from the drying chamber in the exhaust pipe 175 at the condenser 15 along the heat exchange pipe 176. Thus, the exhaust heat of the drying chamber can be used to heat the condensate, and the condensate in the condensate pipe 32 can be used to cool the exhaust gas of the drying chamber. The water vapor in the gas discharged from the drying chamber condenses and liquefies and separates from the air. Therefore, the exhaust heat during the operation of the bubbling bed drying device 12 can be well recovered and utilized.

[0047] In this embodiment, by setting the heat exchange pipe 176 and the condenser 15, the exhaust gas discharged from the drying chamber is used to heat the condensate, and the condensate is used to condense the exhaust gas. To a certain extent, it can well reduce the number of devices for heating the condensate in the steam turbine system and avoid adding devices for cooling the exhaust gas of the drying chamber in the sludge drying system. Thus, the waste heat during the operation of the integrated municipal sludge drying and incineration system 100 using the waste heat of the power plant can be more fully recovered and utilized, and the integrated municipal sludge drying and incineration system 100 using the waste heat of the power plant has fewer equipment and devices, etc. The overall structure of the integrated municipal sludge drying and incineration system 100 using the waste heat of the power plant is simpler, so that the overall structure of the integrated municipal sludge drying and incineration system 100 using the waste heat of the power plant can be more compact, with better integration, and the integrated municipal sludge drying and incineration system 100 using the waste heat of the power plant operates more stably and reliably, and has better operation economy.

[0048] In this embodiment, the inlet end of the heat exchange pipeline 176 is located upstream of the outlet end in the fluid flow direction of the condensate pipeline 32, which can prevent the condensate heated at the condenser 15 from flowing into the condensate pipeline 32 and then re-entering the heat exchange pipeline 176 through the inlet end position of the heat exchange pipeline 176. Thus, the condensate in the heat exchange pipeline 176 can stably flow back to the condensate pipeline 32 along the condensate pipeline 32 after being heated at the condenser 15, enabling the boiler system and the steam turbine system to operate stably in cooperation.

[0049] In one embodiment of the present invention, as Figure 1 shown, a plurality of low-pressure heaters 28 can be provided on the condensate pipeline 32. This can meet the heating requirements of the condensate and greatly improve the operating efficiency and economy of the entire power plant's thermal system. Exemplarily, since the temperature of the condensate flowing into the condensate pipeline 32 at the outlet end of the heat exchange pipeline 176 increases, the connection position between the outlet end of the heat exchange pipeline 176 and the condensate pipeline 32 can be reasonably arranged according to the temperature of the condensate in the condensate pipeline 32 after being heated by the low-pressure heaters 28, so that the temperature of the condensate flowing into the condensate pipeline 32 can be kept close to or consistent with the temperature of the condensate in the condensate pipeline 32 at this position. Thus, the heating of the condensate in the heat exchange pipeline 176 can cooperate well with the heating of the condensate by the plurality of low-pressure heaters 28, enabling the boiler system, the sludge drying system, and the steam turbine system to operate well in cooperation, and making the integrated municipal sludge drying and incineration system 100 using the waste heat of the power plant operate more stably.

[0050] In one embodiment of the present invention, as Figure 1 shown, the sludge drying system may further include a dust removal device 14, and the dust removal device 14 is connected in series to the exhaust gas pipeline 175 and is located upstream of the condenser 15 in the gas flow direction in the exhaust gas pipeline 175.

[0051] In this embodiment, the sludge drying system further includes a dust removal device 14. The dust removal device 14 is located upstream of the condenser 15 in the gas flow direction in the exhaust gas pipeline 175. The dust removal device 14 can separate and collect fly ash, dust, etc. in the gas discharged from the drying chamber, thus preventing the fly ash from entering the condenser 15 with the gas and accumulating to block the condenser 15 or mixing into the condensed liquid. Thus, the condensate obtained after the exhaust gas from the drying chamber is condensed at the condenser 15 is relatively clean, which is convenient for the discharge or subsequent treatment of the condensate to a certain extent.

[0052] In some examples of the present invention, as Figure 1As shown, the boiler system may further include: a coal mill 25 and a boiler 27. The coal mill 25 is adapted to convey pulverized coal to the boiler 27. The sludge drying system further includes: a first feeding pipe 181 and a second feeding pipe 182. The first feeding pipe 181 is connected to the dust discharge port of the dust removal device 14 and the feeding port of the coal mill 25; the second feeding pipe 182 is connected to the discharge port of the bubbling bed drying device 12 and the feeding port of the coal mill 25.

[0053] In this embodiment, the boiler system further includes a coal mill 25 and a boiler 27, with a simple structure and can well meet the operation needs of the boiler system. The coal mill 25 can grind coal into pulverized coal for conveying to the boiler 27, and the boiler 27 receives the pulverized coal from the coal mill 25 as fuel for operation. The first feeding pipe 181 of the sludge drying system is connected to the dust discharge port of the dust removal device 14 and the feeding port of the coal mill 25, so that the fly ash separated and collected by the dust removal device 14 can enter the coal mill 25 and follow the pulverized coal into the boiler 27 to participate in combustion. Thus, the collected fly ash can be conveniently treated, and problems such as equipment increase and pollutant treatment during separate treatment of fly ash can be well avoided, making the structure of the sludge drying system and the boiler system simpler, and making the overall structure of the municipal sludge drying and incineration integrated system 100 using waste heat from power plants more compact and better integrated.

[0054] In this embodiment, the second feeding pipe 182 is connected to the discharge port of the bubbling bed drying device 12 and the feeding port of the coal mill 25, so that the municipal sludge dried in the bubbling bed drying device 12 can be directly fed into the coal mill 25 along the second feeding pipe 182. The dried municipal sludge and coal are well mixed through the pulverizing operation of the coal mill 25 and flow to the boiler 27 to participate in combustion. The structure is simple, enabling the municipal sludge to efficiently participate in the operation process of the boiler system, thereby making the integration of the sludge drying system and the boiler system better, and enabling the operation of the sludge drying system to be well connected to the operation of the boiler system. At the same time, the dried municipal sludge has a relatively high heat. In this embodiment, by directly transporting the dried municipal sludge from the discharge port of the bubbling bed drying device 12 to the feeding port of the coal mill 25 through the second feeding pipe 182, the waste of heat caused by separately storing the dried municipal sludge and then feeding it into the coal mill 25 can be reduced, thus well reducing energy loss and making the energy utilization rate of the municipal sludge drying and incineration integrated system 100 using waste heat from power plants better and the operation economy better.

[0055] In an example of the present invention, as Figure 1 shown, the sludge drying system may further include: a first blower 16 and a reflux pipe 183. The reflux pipe 183 is connected to the exhaust port of the condenser 15 and the feeding port of the coal mill 25. The first blower 16 is used to drive the air flow to flow along the reflux pipe 183 to the feeding port of the coal mill 25.

[0056] In this embodiment, the sludge drying system further includes a first fan 16 and a return pipe 183. The return pipe 183 is connected to the exhaust port of the condenser 15 and the feed port of the coal mill 25. The first fan 16 drives the air flow towards the feed port of the coal mill 25. With a simple structure, the gas discharged from the drying chamber can flow into the coal mill 25 of the boiler system and then participate in the transportation of pulverized coal and the ground municipal sludge powder, thereby avoiding the emission of gas into the external environment or adding a gas purification device to treat the gas, so that the gas generated during the operation of the sludge drying system can be well treated.

[0057] In this embodiment, the first fan 16 is provided to drive the air flow towards the feed port of the coal mill 25. With a simple structure, the gas can flow stably towards the coal mill 25, making the operation of the sludge drying system more stable.

[0058] In some specific embodiments of the present invention, such as Figure 1 shown, the sludge drying system may further include a gas mixing device 13. The outlet of the gas mixing device 13 is connected to the feed port of the coal mill 25, and the return pipe 183 is connected to and communicates with the inlet of the gas mixing device 13.

[0059] In this embodiment, the sludge drying system further includes a gas mixing device 13. The outlet of the gas mixing device 13 is connected to the feed port of the coal mill 25, and the return pipe 183 is connected to and communicates with the inlet of the gas mixing device 13. With a simple structure, it is convenient to mix the exhaust gas from the drying chamber with the gas transported to the coal mill 25 and then send it into the coal mill 25, so that the temperature of the air flow entering the coal mill 25 can be uniform, and thus the air flow can stably transport the mixture of pulverized coal and the powder of dried municipal sludge.

[0060] In a specific embodiment of the present invention, such as Figure 1 shown, the sludge drying system may further include a second air supply pipeline 172. The boiler system may further include an air preheater 26. The second air supply pipeline 172 is connected to the outlet of the air heater 24 and the inlet of the gas mixing device 13, and the cold side of the air preheater 26 is connected in series on the second air supply pipeline 172.

[0061] In this embodiment, the sludge drying system further includes a second air supply pipeline 172. The second air supply pipeline 172 is connected to the outlet of the air heater 24 and the inlet of the gas mixing device 13, and the cold side of the air preheater 26 is connected in series on the second air supply pipeline 172, so that part of the air flow heated by the air heater 24 can flow along the second air supply pipeline 172 through the air preheater 26 and be reheated and then flow into the gas mixing device 13 to be mixed with the gas discharged from the drying chamber, so that the temperature of the air flow used to transport pulverized coal and municipal sludge powder can meet the operating requirements of the combustion of the boiler 27.

[0062] In this embodiment, the air flow for transporting pulverized coal, etc. is heated by the air preheater 24 and the air recuperator, so that the utilization of flue gas waste heat is more sufficient and has a wider range of uses, thereby making the integration and integrity of the operation of the municipal sludge drying and incineration integrated system 100 better and making the operation of the municipal sludge drying and incineration integrated system 100 more stable.

[0063] The following refers to Figure 1 and Figure 2 to describe the method for drying and incinerating municipal sludge using the waste heat of a power plant according to the second aspect embodiment of the present invention.

[0064] As Figure 1 and Figure 2 shown, the method for drying and incinerating municipal sludge using the waste heat of a power plant according to the embodiment of the present invention is applied to the municipal sludge drying and incineration system according to the first aspect embodiment of the present invention. The method for drying and incinerating municipal sludge using the waste heat of a power plant includes: performing two-stage waste heat recovery on the flue gas discharged from the boiler system, wherein the primary waste heat is transported to the bubbling bed drying device 12 to dry the sludge, and the secondary waste heat is transported to the air preheater 24; the gas heated by the air preheater 24 is transported to the air chamber of the bubbling bed drying device 12; the municipal sludge is crushed and then sent to the bubbling bed drying device 12 for drying; the dried sludge is transported to the boiler 27 for combustion; the gas discharged from the bubbling bed drying device 12 is dust-removed and condensed, and the obtained dust and gas are sent to the boiler 27 for combustion.

[0065] In this embodiment, the method for drying and incinerating municipal sludge using the waste heat of a power plant includes performing two-stage waste heat recovery on the flue gas of the boiler 27. The primary waste heat is transported to the bubbling bed drying device 12 to dry the sludge, and the secondary waste heat is transported to the air preheater 24. By adopting the two-stage waste heat recovery method, the waste heat in the flue gas can be more fully recovered and utilized. The temperature of the primary waste heat is relatively high, which makes the drying effect and efficiency of the bubbling bed drying device 12 on the municipal sludge better. The secondary waste heat is transported to the air preheater 24 and can be used as the heat source of the air preheater 24 to heat the gas, thereby making good use of the flue gas waste heat. Exemplarily, in this embodiment, by setting the first heat exchanger 22 and the first circulation pipeline 173, the second heat exchanger 23 and the second circulation pipeline 174, the heat transfer fluid in the first circulation pipeline 173 is heated by the flue gas at the first heat exchanger 22 and then flows to the submerged pipe 121 of the bubbling bed drying device 12 for heating and drying operations. The heat transfer fluid in the second circulation pipeline 174 is heated by the flue gas that has passed through the first heat exchanger 22 at the second heat exchanger 23, and the heated heat transfer fluid flows to the air preheater 24 to heat the gas.

[0066] The gas heated by the air heater 24 is transported to the air chamber of the bubbling bed drying device 12, and thus participates in the drying operation of municipal sludge as fluidizing air. The fluidizing air refers to the fluidizing medium that lifts the material to be dried to form a state similar to boiling liquid. In this embodiment, the fluidizing air can utilize the waste heat of the flue gas and has a certain temperature through the heating of the air heater 24, so as to improve the drying effect of the bubbling bed drying device 12.

[0067] In this embodiment, the municipal sludge is crushed and then sent to the bubbling bed drying device 12 for drying, so that the drying speed of the municipal sludge in the bubbling bed drying device 12 is faster and the drying efficiency is higher. During the drying process of the bubbling bed drying device 12, the water vapor in the municipal sludge is heated and evaporated into water vapor and discharged with the gas. The gas discharged from the bubbling bed drying device 12 is dust-removed and condensed, so that the dust and water vapor in the gas are separated from the gas. The dust and the gas are sent to the boiler 27 to participate in combustion, thus avoiding the environmental impact caused by discharging to the external environment well. The gas and dust generated during the operation of the bubbling bed drying device 12 are all processed by the boiler system, so as to reduce the emission of pollutants to a certain extent, and make the sludge drying system and the boiler system cooperate closely, so that the operation integrity of the municipal sludge drying and incineration system using the waste heat of the power plant is better.

[0068] According to the method for drying and incinerating municipal sludge using the waste heat of the power plant according to the embodiment of the present invention, by applying it to the municipal sludge drying and incineration system, through two-stage waste heat recovery of the flue gas discharged from the boiler system, the primary waste heat is transported to the bubbling bed drying device 12 to dry the sludge, and the secondary waste heat is transported to the air heater 24. The gas heated by the air heater 24 is transported to the air chamber of the bubbling bed drying device 12. The structure is simple, so that the waste heat of the flue gas of the boiler system can be more fully and reasonably recovered and utilized, and the integrated municipal sludge drying and incineration system 100 using the waste heat of the power plant has better integration and is more compact, so that the integrated municipal sludge drying and incineration system 100 using the waste heat of the power plant can operate more efficiently and stably.

[0069] In some embodiments of the present invention, referring to Figure 1 and Figure 2 as shown, the gas discharged from the bubbling bed drying device 12 is dust-removed and condensed, which may include: the gas discharged from the bubbling bed drying device 12 is dust-removed; the dust-removed gas is condensed using the condensate from the condenser 31.

[0070] In this embodiment, when dust removal and condensation are performed on the gas discharged from the bubbling bed drying device 12, the gas discharged from the bubbling bed drying device 12 first undergoes a dust removal operation, and the dust-removed gas is then heat-exchanged and cooled using the condensed water from the condenser 31. This can well avoid the difficulty of separating dust after the water vapor in the gas condenses and mixes with dust, etc., can well meet the dust removal requirements of the exhaust gas, and can reduce the probability of dust in the gas accumulating and blocking the pipeline at the condenser 15, enabling the condenser 15 to operate stably. In this embodiment, the dust-removed gas is condensed using the condensed water from the condenser 31, which can well utilize the waste heat in the gas discharged from the bubbling bed drying device 12, thereby making the overall energy utilization of the sludge drying system and the boiler system more sufficient, and enabling the waste heat during the operation of the power plant to be utilized more fully.

[0071] Reference will be made below to Figure 1 and Figure 2 describe a municipal sludge drying and incineration system that utilizes the waste heat of a power plant according to a specific embodiment of the present invention.

[0072] As Figure 1 shown, a municipal sludge drying and incineration system that utilizes the waste heat of a power plant includes a sludge drying system, a boiler system, and a steam turbine system.

[0073] The sludge drying system includes a granulator 11, a bubbling bed drying device 12, a gas mixing device 13, a first air supply pipeline 171, a second air supply pipeline 172, a first circulation pipeline 173, a second circulation pipeline 174, an exhaust pipeline 175, a dust removal device 14, a condenser 15, a heat exchange pipeline 176, a first feeding pipe 181, a second feeding pipe 182, a first fan 16, and a reflux pipe 183. The boiler system includes a coal mill 25, a boiler 27, an air preheater 26, a smoke exhaust pipeline 21, a warm air heater 24, a first heat exchanger 22, a second heat exchanger 23, and a low-pressure heater 28. The steam turbine system includes a condenser 31 and a condensate pipeline 32.

[0074] The bubbling bed drying device 12 includes a drying chamber, an air chamber, and immersed tubes 121. The outlet of the granulator 11 is connected to the inlet of the drying chamber. The second feeding pipe 182 is connected to the discharge port of the drying chamber and the feeding port of the coal mill 25. The exhaust pipeline 175 is connected to the exhaust port of the drying chamber. The dust removal device 14 and the hot side of the condenser 15 are connected in series on the exhaust pipeline 175. The cold side of the condenser 15 is connected in series on the heat exchange pipeline 176. The reflux pipe 183 is connected to the exhaust port of the condenser 15 and the inlet of the gas mixing device 13. The first fan 16 is provided on the reflux pipe 183. The first feeding pipe 181 is connected to the dust discharge port of the dust removal device 14 and the feeding port of the coal mill 25. The immersed tubes 121 are connected in series on the first circulation pipeline 173. The first air supply pipeline 171 is connected to the inlet of the air chamber. The second air supply pipeline 172 is connected to the inlet of the gas mixing device 13.

[0075] The coal mill 25 is adapted to convey pulverized coal to the boiler 27. The outlet of the gas mixing device 13 is communicated with the inlet of the coal mill 25. The first heat exchanger 22 and the second heat exchanger 23 are arranged in sequence along the flue gas flow direction on the flue gas exhaust pipeline 21. A plurality of first heaters are connected in series on the condensate pipeline 32. The condensate pipeline 32 is connected to the condenser 31 to convey condensate. The inlet end and the outlet end of the heat exchange pipeline 176 are both connected to the condensate pipeline 32, and the inlet end is located upstream of the outlet end in the condensate flow direction. The cold side of the first heat exchanger 22 is connected in series on the first circulation pipeline 173. The cold side of the second heat exchanger 23 and the air preheater 24 are connected in series on the second circulation pipeline 174. The second air supply pipeline 172 is connected to the outlet of the air preheater 24. The cold side of the air preheater 26 is connected in series on the second air supply pipeline 172. It should be noted that valve components and driving components such as fans and fluid pumps can be flexibly arranged on each pipeline in this embodiment as needed to meet the operation requirements of the municipal sludge drying and incineration integrated system 100, and no specific description is made here.

[0076] The following describes the municipal sludge drying and incineration method of the municipal sludge drying and incineration integrated system 100 using the waste heat of a power plant according to the above embodiments of the present invention.

[0077] Reference Figure 1 And Figure 2 As shown, when the municipal sludge drying and incineration integrated system 100 operates, the heat exchange fluids in the first circulation pipeline 173 and the second circulation pipeline 174 are respectively heated by using the flue gas waste heat through the first heat exchanger 22 and the second heat exchanger 23. The heated heat exchange fluid in the first circulation pipeline 173 flows to the buried pipe 121. The heated heat exchange fluid in the second circulation pipeline 174 flows to the air preheater 24. The air preheater 24 uses the heat exchange fluid to heat the gas. A part of the heated gas flows into the air chamber along the first air supply pipeline 171, and another part flows into the gas mixing device 13 along the second air supply pipeline 172 and then flows to the coal mill 25. The granulator 11 crushes the municipal sludge. After being crushed by the granulator 11, the municipal sludge enters the drying cavity of the bubbling bed drying device 12. The municipal sludge is gradually heated under the combined action of indirect heating at the heating surface of the buried pipe 121, the fluidizing air heated in the air chamber, and direct heating by the original hot material. The moisture evaporates and flows out of the drying cavity with the air, thereby realizing the drying of the municipal sludge.

[0078] Exemplarily, the temperature in the drying chamber can be maintained at 100°C to 120°C under the action of indirect heating of the buried pipe 121 and the fluidizing air in the air chamber, and the pressure can be maintained at -100 Pa to -200 Pa. This is beneficial to the drying of municipal sludge and can make the drying effect of the bubbling bed drying device 12 on municipal sludge better. The dried municipal sludge flows into the coal mill 25 along the second feeding pipe 182. The airflow generated during the drying process flows along the exhaust pipe 175. The dust removal device 14 separates and collects the dust in the airflow. The collected dust, fly ash, etc. flow into the coal mill 25 along the first feeding pipe 181. The airflow exchanges heat and cools with the condensate water at the condenser 15 to separate the water vapor in the airflow. The dehydrated gas flows along the return pipe 183 to the gas mixing device 13, mixes with the airflow from the second air supply pipe 172, and then flows to the coal mill 25. The coal mill 25 grinds the coal and municipal sludge, etc. The airflow from the gas mixing device 13 dries and transports the mixture of pulverized coal and the powder of municipal sludge to the burner and then flows into the boiler 27 for combustion.

[0079] In this embodiment, by setting up a boiler system and a sludge drying system, the boiler system is provided with a first heat exchanger 22 and a second heat exchanger 23, and the sludge drying system is provided with a first air supply pipe 171, a first circulation pipe 173 and a second circulation pipe 174. The cold side of the first heat exchanger 22 and the buried pipe 121 are connected in series on the first circulation pipe 173. The air heater 24 and the cold side of the second circulation pipe 174 are connected in series on the second circulation pipe 174. The first air supply pipe 171 is connected to the inlet of the air chamber and the outlet of the air heater 24. The structure is simple, the design is reasonable, and the practicability is strong. The waste heat of the flue gas of the boiler system can be recovered and utilized more fully and reasonably, and the integrated municipal sludge drying and incineration integrated system 100 using the waste heat of the power plant is more integrated and compact. On the premise of realizing the treatment of municipal sludge and reducing the secondary pollution to the environment it causes, the municipal sludge is mixed with pulverized coal and then participates in combustion, realizing the efficient energy utilization of municipal sludge. Thus, the integrated municipal sludge drying and incineration integrated system 100 using the waste heat of the power plant can operate more efficiently and stably.

[0080] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0081] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0082] In the present invention, unless otherwise clearly specified and defined, terms such as "installed", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without conflict, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0084] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An integrated system for municipal sludge drying and incineration using waste heat from power plants, characterized in that, Comprising: A boiler system, the boiler system includes an exhaust gas pipeline (21) and a warm air heater (24), and the exhaust gas pipeline (21) is provided with a first heat exchanger (22) and a second heat exchanger (23) arranged in sequence along the flow direction of the flue gas; A sludge drying system, the sludge drying system includes: A bubbling bed drying device (12), the bubbling bed drying device (12) is provided with a buried pipe (121) and an air chamber, and the bubbling bed drying device (12) is adapted to convey the dried sludge to the boiler system for combustion; A first air supply pipeline (171), the first air supply pipeline (171) is connected to the inlet of the air chamber and the outlet of the warm air heater (24); A first circulation pipeline (173), a heat exchange fluid is provided in the first circulation pipeline (173), and the buried pipe (121) and the cold side of the first heat exchanger (22) are connected in series on the first circulation pipeline (173); A second circulation pipeline (174), a heat exchange fluid is provided in the second circulation pipeline (174), and the warm air heater (24) and the cold side of the second heat exchanger (23) are connected in series on the second circulation pipeline (174).

2. The integrated system for municipal sludge drying and incineration using the waste heat of a power plant according to claim 1, wherein, The bubbling bed drying device (12) is provided with a drying chamber, and the sludge drying system further includes a granulator (11), the outlet of the granulator (11) is connected to the inlet of the drying chamber, the granulator (11) is used for crushing the municipal sludge entering the drying chamber, and the granulator (11) is configured to crush the municipal sludge into particle clusters with a particle size less than or equal to 30 mm.

3. The integrated system for municipal sludge drying and incineration using the waste heat of a power plant according to claim 1, characterized in that, The sludge drying system further includes: An exhaust gas pipeline (175), the exhaust gas pipeline (175) is connected to the exhaust port of the bubbling bed drying device (12); A condenser (15), the hot side of the condenser (15) is connected in series on the exhaust gas pipeline (175); A heat exchange pipeline (176), the integrated municipal sludge drying and incineration system using power plant waste heat further includes a steam turbine system, the steam turbine system is provided with a condensate pipeline (32) and a condenser (31), the condensate pipeline (32) is used to convey the condensate from the condenser (31) to the boiler system, the inlet end and the outlet end of the heat exchange pipeline (176) are both connected to the condensate pipeline (32), wherein, the inlet end of the heat exchange pipeline (176) is located upstream of the outlet end in the fluid flow direction of the condensate pipeline (32), and the cold side of the condenser (15) is connected in series on the heat exchange pipeline (176).

4. The integrated municipal sludge drying and incineration system using the waste heat of a power plant according to claim 3, characterized in that, The sludge drying system further includes a dust removal device (14), the dust removal device (14) is connected in series to the exhaust gas pipeline (175) and is located upstream of the condenser (15) in the gas flow direction of the exhaust gas pipeline (175).

5. The integrated municipal sludge drying and incineration system using the waste heat of a power plant according to claim 4, characterized in that, The boiler system further includes: a coal mill (25) and a boiler (27), the coal mill (25) is adapted to convey pulverized coal to the boiler (27), and the sludge drying system further includes: A first feeding pipe (181), the first feeding pipe (181) is connected to the dust discharge port of the dust removal device (14) and the feeding port of the coal mill (25); A second material conveying pipe (182), which is connected to the discharge port of the bubbling bed drying device (12) and the feed port of the coal mill (25).

6. The integrated municipal sludge drying and incineration system utilizing the waste heat of a power plant according to claim 5, wherein The sludge drying system further includes: a first fan (16) and a return pipe (183), the return pipe (183) is connected to the exhaust port of the condenser (15) and the feed port of the coal mill (25), and the first fan (16) is used to drive the air flow to flow along the return pipe (183) to the feed port of the coal mill (25).

7. The integrated system for municipal sludge drying and incineration using the waste heat of a power plant according to claim 6, wherein The sludge drying system further includes a gas mixing device (13), the outlet of the gas mixing device (13) is connected to the feed port of the coal mill (25), and the return pipe (183) is connected and communicated with the inlet of the gas mixing device (13).

8. The integrated system for municipal sludge drying and incineration using the waste heat of a power plant according to claim 7, characterized in that, The sludge drying system further includes a second air supply pipeline (172), the boiler system further includes an air preheater (26), the second air supply pipeline (172) is connected to the air outlet of the air heater (24) and the inlet of the gas mixing device (13), and the cold side of the air preheater (26) is connected in series on the second air supply pipeline (172).

9. A method for municipal sludge drying and incineration using the waste heat of a power plant, characterized in that, For the integrated municipal sludge drying and incineration system using waste heat from a power plant according to any one of claims 1-8, the method for drying and incinerating municipal sludge using waste heat from a power plant includes: Performing two-stage waste heat recovery on the flue gas of the boiler system, wherein the primary waste heat is transported to the bubbling bed drying device (12) to dry the sludge, and the secondary waste heat is transported to the air heater (24); The gas heated by the air heater (24) is transported to the air chamber of the bubbling bed drying device (12); The municipal sludge is crushed and then sent to the bubbling bed drying device (12) for drying; The dried sludge is transported to the boiler (27) to participate in combustion; The gas discharged from the bubbling bed drying device (12) is dust-removed and condensed, and the obtained dust and gas are sent to the boiler (27) to participate in combustion.

10. The method for municipal sludge drying and incineration using the waste heat of a power plant according to claim 9, characterized in that, The gas discharged from the bubbling bed drying device (12) is dust-removed and condensed, including: The gas discharged from the bubbling bed drying device (12) is dust-removed; The dust-removed gas is condensed using the condensate water from the condenser (31).

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